ELECTRIC DOUBLE LAYER CAPACITOR HAVING SEPARATOR-INCLUDING ELECTRODE

Abstract

The present invention relates to an electric double layer capacitor basic cell having a separator-including electrode, the cell having improved conductivity of an electric double layer capacitor basic cell by using a separator-including electrode without a separation membrane so as to have excellent electric energy storage and output performance. In addition, the present invention relates to an electric double layer capacitor cell having a separator-including electrode, the cell allowing a plurality of electrode pairs to be stacked such that current collector plates of the same polarity are connected and allowing the current collector plates of the plurality of stacked electrode pairs connected while having the same polarity to be mutually connected, thereby having improved electric energy storage density and output performance of an electric double layer capacitor cell. In addition, the present invention relates to an energy storage device in which electric double layer capacitor cells having a separator-including electrode are connected in series, the device having a plurality of electric double layer capacitor cells connected in series without an external separate circuit board so as to reduce characteristic distortion caused by an increase in contact resistance, thereby remarkably reducing the necessity of a separate correction circuit. The electric double layer capacitor basic cell having a separator-including electrode of the present invention can be formed by using a current collector plate and an electrode, which comprises a separator convexly protruding from the current collector plate with a continuous pattern of a certain design so as to form a convex shape having a pattern repeated in lengthwise and widthwise directions of the current collector plate, or convexly protruding with a pattern continuous in the lengthwise direction of the current collector plate, and having a pattern repeated in the widthwise direction of the current collector plate. The electric double layer capacitor basic cell having a separator-including electrode, according to the present invention, reduces the distance between facing electrodes so as to improve conductivity over that of a conventional electric double layer capacitor basic cell, thereby having excellent electric energy storage and output performance. The electric double layer capacitor cell having a separator-including electrode, of the present invention, allows electrode pairs of the plurality of double layer capacitor basic cells having a separator-including electrode, of the present invention, to be stacked by alternating such that the electrode pairs of the same polarity are connected by adjoining and coming in contact with each other, and thus compared with conventional stacked electrode pairs and electric double layer capacitor cells stacked between the electrode pairs by using a separation membrane, stacked electrode pairs are increased so as to improve electric energy storage and output performance because of the improvement in conductivity and improve electric energy storage density. In addition, since a plurality of separation membranes are unnecessary, quality issues are improved and manufacturing costs are reduced. In addition, the energy storage device having, connected in series, electric double layer capacitor cells having a separator-including electrode, according to the present invention, allows, within an energy storage device container, a front surface of an anode current collector plate at ends of the plurality of electric double layer capacitor cells having a separator-including electrode, of the present invention, to be connected to a front surface of a cathode current collector plate at a starting end of another electric double layer capacitor cell having a separator-including electrode, of the present invention, which is adjoined and connected with the capacitor cell in series such that the connected elements are connected in series within the energy storage device container, and thus compared with that of a conventional energy storage device having a plurality of electric double layer capacitor cells connected in series by using a separate external circuit board, characteristic distortion caused by an increase in connection resistance according to an external circuit board connection is remarkably reduced so as to remarkably reduce the necessity of a separate correction circuit and improve the durability limit due to the use of an external circuit board. In addition, instruments, which were necessary for protecting an external circuit, are not required, and thus the present invention has an excellent effect of reducing manufacturing costs and improving durability.

Claims

1. An electric double layer capacitor comprising: a current collector plate; and a convex-shaped separator which protrudes convexly from one surface of the current collector plate in a continuous pattern of a predetermined design and in which a repeated pattern is formed in length and width directions of the current collector plate.

2. The electric double layer capacitor of claim 1, wherein the separator is formed to protrude from the current collector plate in a circular or polygonal form.

3. The electric double layer capacitor of claim 2, wherein the separator is formed such that separators having various sizes and distances are formed on a single current collector plate by varying a size of the convex-shaped separator and a distance between the convex-shaped separators formed on the current collector plate for each region.

4. An electric double layer capacitor comprising: a current collector plate; and a separator having a shape which protrudes convexly and continuously from the current collector plate in the length direction of the current collector plate and is repeated in a width direction thereof.

5. The electric double layer capacitor of claim 4, wherein the separator is formed such that separators having various sizes and distances are formed on a single current collector plate by varying a size of a shape of the separator and a distance between shapes of the separators formed on the current collector plate for each region.

6. An electric double layer capacitor comprising electrode pairs, wherein one or more electrode pairs are stacked to be connected in parallel such that current collector plates having the same polarity thereof are connected to each other.

7. The electric double layer capacitor of claim 6, comprising a convex-shaped separator which protrudes convexly from one surface of the current collector plate in a continuous pattern of a predetermined design and in which a repeated pattern is formed in length and width directions of the current collector plate.

8. The electric double layer capacitor of claim 7, wherein the separator is formed to protrude from the current collector plate in a circular or polygonal form.

9. The electric double layer capacitor of claim 8, wherein the separator is formed such that separators having various sizes and intervals are formed on a single current collector plate by varying a size of the convex-shaped separator and a distance between the convex-shaped separators formed on the current collector plate for each region.

10. The electric double layer capacitor of claim 6, comprising a convex-shaped separator which protrudes convexly from both surfaces of the current collector plate in a continuous pattern of a predetermined design and in which a repeated pattern is formed in length and width directions of the current collector plate.

11. The electric double layer capacitor of claim 10, wherein the separator is formed to protrude from the both surfaces of the current collector plate in a circular or polygonal form.

12. The electric double layer capacitor of claim 11, wherein the separator is formed such that separators having various sizes and distances are formed on a single current collector plate by varying a size of the convex-shaped separator and a distance between the convex-shaped separators formed on the current collector plate for each region.

13. The electric double layer capacitor of claim 6, comprising a separator having a shape which protrudes convexly from one surface of the current collector plate in a continuous pattern in a length direction of the current collector plate and in which a repeated pattern is formed in a width direction of the current collector plate.

14. The electric double layer capacitor of claim 13, wherein the separator is formed to protrude from the current collector plate in a rod or polygonal form.

15. The electric double layer capacitor of claim 14, wherein the separator is formed such that separators having various sizes and distances are formed on a single current collector plate by varying a size of a shape of the separator and a distance between shapes of the separators formed on the current collector plate for each region.

16. The electric double layer capacitor of claim 6, comprising a separator having a shape which protrudes convexly from both surfaces of the current collector plate in a continuous pattern in a length direction of the current collector plate and in which a repeated pattern is formed in a width direction of the current collector plate.

17. The electric double layer capacitor of claim 16, wherein the separator is formed to protrude from the current collector plate in a rod or polygonal form.

18. The electric double layer capacitor of claim 17, wherein the separator is formed such that separators having various sizes and distances are formed on a single current collector plate by varying a size of a shape of the separator and a distance between shapes of the separators formed on the current collector plate for each region.

19. An electric double layer capacitor serial connection energy storage device in which one or more electric double layer capacitors are connected in series, wherein a current collector plate provided at a final end of one electric double layer capacitor is directly connected to a current collector plate provided at a starting end of another electric double layer capacitor in series.

20. The electric double layer capacitor serial connection energy storage device of claim 19, further comprising a cell sill of the electric double layer capacitor provided around an edge of a connection surface of the current collector plate.

21. The electric double layer capacitor serial connection energy storage device of claim 19, comprising a convex-shaped separator which protrudes convexly from one surface of the current collector plate in a continuous pattern of a predetermined design and in which a repeated pattern is formed in length and width directions of the current collector plate.

22. The electric double layer capacitor serial connection energy storage device of claim 21, wherein the separator is formed to protrude from the current collector plate in a circular or polygonal form.

23. The electric double layer capacitor serial connection energy storage device of claim 22, wherein the separator is formed such that separators having various sizes and distances are formed on a single current collector plate by varying a size of the convex-shaped separator and a distance between the convex-shaped separators formed on the current collector plate for each region.

24. The electric double layer capacitor serial connection energy storage device of claim 19, comprising a convex-shaped separator which protrudes convexly from both surfaces of the current collector plate in a continuous pattern of a predetermined design and in which a repeated pattern is formed in the length and width directions of the current collector plate.

25. The electric double layer capacitor serial connection energy storage device of claim 24, wherein the separator is formed to protrude from the current collector plate in a circular or polygonal form.

26. The electric double layer capacitor serial connection energy storage device of claim 25, wherein the separator is formed such that separators having various sizes and distances are formed on a single current collector plate by varying a size of the convex-shaped separator and a distance between the convex-shaped separators formed on the current collector plate for each region.

27. The electric double layer capacitor serial connection energy storage device of claim 19, comprising a separator having a shape which protrudes convexly from one surface of the current collector plate in a continuous pattern in a length direction of the current collector plate and in which a repeated pattern is formed in a width direction of the current collector plate.

28. The electric double layer capacitor serial connection energy storage device of claim 27, wherein the separator is formed to protrude from the current collector plate in a rod or polygonal form.

29. The electric double layer capacitor serial connection energy storage device of claim 28, wherein the separator is formed such that separators having various sizes and distances are formed on a single current collector plate by varying a size of a shape of the separator and a distance between shapes of the separators formed on the current collector plate for each region.

30. The electric double layer capacitor serial connection energy storage device of claim 19, comprising a separator having a shape which protrudes convexly from both surfaces of the current collector plate in a continuous pattern in a length direction of the current collector plate and is repeated in a width direction of the current collector plate.

31. The electric double layer capacitor serial connection energy storage device of claim 30, wherein the separator is formed to protrude from the current collector plate in a rod or polygonal form.

32. The electric double layer capacitor serial connection energy storage device of claim 31, wherein the separator is formed such that separators having various sizes and distances are formed on a single current collector plate by varying a size of a shape and a distance between shapes of the separators formed on the current collector plate for each region.

Description

DESCRIPTION OF DRAWINGS

[0022] FIG. 1 is a schematic structural diagram of a conventional electric double layer capacitor basic cell.

[0023] FIG. 2 is a schematic structural diagram of a conventional electric double layer capacitor cell.

[0024] FIG. 3 is a schematic diagram of an electrode stack of the conventional electric double layer capacitor cell.

[0025] FIG. 4 is a schematic diagram of an energy storage device in which a plurality of the conventional electric double layer capacitor cells are connected in series.

[0026] FIG. 5A is a schematic structural diagram of a separator-including electrode electric double layer capacitor basic cell according to a first embodiment of the present invention.

[0027] FIG. 5B is a side view of a structure of a separator-including electrode according to the first embodiment of the present invention.

[0028] FIG. 5C is a plan view of the structure of the separator-including electrode according to the first embodiment of the present invention.

[0029] FIG. 5D is a side view of a structure of a separator-including double electrode current collector plate according to a second embodiment of the present invention.

[0030] FIG. 5E is a side view of a structure of a vertical stripe separator-including electrode current collector plate according to a third embodiment of the present invention.

[0031] FIG. 5F is a plan view of the structure of the vertical stripe separator-including electrode current collector plate according to the third embodiment of the present invention.

[0032] FIG. 5G is a side view of a structure of a vertical stripe separator-including dual electrode current collector plate according to a fourth embodiment of the present invention.

[0033] FIG. 6A is a schematic structural diagram of a separator-including electrode electric double layer capacitor cell according to a first embodiment of the present invention.

[0034] FIG. 6B is a schematic diagram illustrating a stack of electrode pairs of the separator-including electrode electric double layer capacitor cell according to the first embodiment of the present invention.

[0035] FIG. 7A is a schematic structural diagram of a separator-including double electrode electric double layer capacitor cell according to the second embodiment of the present invention.

[0036] FIG. 7B is a schematic diagram illustrating a stack of electrode pairs of the separator-including double electrode electric double layer capacitor cell according to the second embodiment of the present invention.

[0037] FIG. 8A is a schematic structural diagram of an energy storage device in which a plurality of separator-including electrode electric double layer capacitor cells according to the first embodiment of the present invention are connected in series.

[0038] FIG. 8B is a schematic internal structural side view of an energy storage device container in which a plurality of separator-including electrode electric double layer capacitor cells of the present invention are connected in series.

[0039] FIG. 8C is a schematic diagram of the energy storage device container in which the plurality of separator-including electrode electric double layer capacitor cells of the present invention are connected in series.

[0040] FIG. 9 is a schematic structural diagram of an energy storage device in which the plurality of separator-including electrode electric double layer capacitor cells according to the second embodiment of the present invention are connected in series.

MODES OF THE INVENTION

[0041] Hereinafter, a separator-including electrode electric double layer capacitor basic cell, a separator-including electrode electric double layer capacitor cell in which electrode pairs of a plurality of separator-including electrode electric double layer capacitor basic cells are stacked and connected in parallel, and an energy storage device in which the plurality of separator-including electrode electric double layer capacitor basic cells are connected in series will be described. Configurations illustrated in the drawings are conceptual diagrams for describing the concept of the present invention, and descriptions of known techniques with respect to the configurations will be omitted.

[0042] Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Therefore, shapes and sizes of components in the drawings may be exaggerated or reduced for a more definite description.

[0043] First, according to the present invention, an electric double layer capacitor having a separator-including electrode which is formed in a convex shape, in which a pattern protrudes convexly from a current collector plate in a continuous pattern of a predetermined design and is formed in a repeated pattern in length and width directions of the current collector plate, may be implemented in various embodiments. A first embodiment is an example in which a separator-including electrode is formed on one surface of the current collector plate. A second embodiment is an example in which a structure of a separator-including double electrode current collector plate, in which the separator-including electrodes are formed on both surfaces of the current collector plate, is formed. A third embodiment is an example in which a vertical stripe separator-including electrode is formed on one surface of the current collector plate in a stripe pattern which is continuous in the length direction of the current collector plate.

[0044] A fourth embodiment is an example in which a vertical separator-including double electrode current collector plate, in which an electrode having a vertical stripe separator formed on both surfaces of the current collector plate in a stripe pattern which is continuous in the length direction of the current collector plate, is formed.

[0045] FIG. 5A is a structural diagram of a separator-including electrode electric double layer capacitor basic cell according to the first embodiment of the present invention, FIG. 5B is a side view of a structure of the separator-including electrode shown in FIG. 5A, and FIG. 5C is a plan view of the structure of the separator-including electrode shown in FIG. 5A.

[0046] Referring to FIG. 5A, an electric double layer capacitor basic cell 500 having a separator-including electrode according to the first embodiment includes a capacitor container 510, a separator-including electrode 520 having a positive electrode layer 522 with a separator 521 in the capacitor container 510, wherein the separator 521 is made of an insulating material, protrudes convexly from one surface of a positive current collector plate 526 in a continuous pattern of a predetermined design, and has a convex shape in which a repeated pattern is formed in length and width directions of the positive current collector plate 526 and of which a height is higher than that of the positive electrode layer 522, and another separator-including electrode 520 having a negative electrode layer 524 with a separator 521 which is made of an insulating material, protrudes convexly from one surface of a negative current collector plate 528 in a continuous pattern of a predetermined design, and has a convex shape in which a repeated pattern is formed in length and width directions of the negative current collector plate 528 and of which a height is higher than that of the negative electrode layer 524 in the same manner as in the positive electrode layer 522. The electric double layer capacitor basic cell 500 having a separator-including electrode is formed such that the separator-including electrode 520 and the another separator-including electrode 520 are disposed to face each other as electrode pairs, final ends of upper portions of the separators 521, which are made of an insulating material and provided at a higher level on the positive electrode layer 522 and the negative electrode layer 524, are in contact with each other such that the positive electrode layer 522 is physically separated from the negative electrode layer 524 and thus a gap is formed to prevent an electrical contact between the positive electrode layer 522 and the negative electrode layer 524, and the capacitor container 510 is filled with an electrolyte 560 so that the positive electrode layer 522 and the negative electrode layer 524 are connected in terms of transport of positive ions and negative ions of the electrolyte 560.

[0047] The separator-including electrode 520 of the first embodiment may be manufactured by applying an insulator layer, such as a photoresist, on the positive current collector plate 526 and the negative current collector plate 528, removing a portion except for the design of the predetermined pattern using etching to form an insulator pattern protruding convexly in the predetermined pattern, and forming the positive electrode layer 522 and the negative electrode layer 524 by printing and thermocompression bonding or sintering a paste made of a material such as activated carbon having a large unit surface area, may be manufactured by directly forming the separator 521 in a pattern of a predetermined design protruding convexly from the positive current collector plate 526 and the negative current collector plate 528 through printing and sintering, and forming the positive electrode layer 522 and the negative electrode layer 524 by printing and thermocompression bonding or sintering a paste made of a material such as activated carbon having a large unit surface area, or may be manufactured by printing and drying an electrode paste, which is made of a material such as activated carbon having a large unit surface area, on one surface of each of the positive current collector plate 526 and the negative current collector plate 528, inserting the separator 521, which is separately formed of an insulating material, between the positive electrode layer 522 and the negative electrode layer 524 to temporarily form the separator-including electrode 520, and thermocompression bonding or sintering the positive electrode layer 522 and the negative electrode layer 524 to manufacture the separator-including electrode 520. The separator-including electrode 520 may be manufactured by applying various process techniques.

[0048] Referring to FIGS. 5A to 5C, the electric double layer capacitor basic cell 500 having a separator-including electrode according to the first embodiment of the present invention is formed such that the positive electrode layer 522 and the negative electrode layer 524, which have the separators 521 made of an insulating material and having the convex shapes which protrude convexly from the one surfaces of the positive current collector plate 526 and the negative current collector plate 528 in the continuous pattern of the predetermined design and of which heights are higher than those of the positive electrode layer 522 and the negative electrode layer 524, are disposed to face each other as electrode pairs in the capacitor container 510, the final end of the upper portion of the separator 521 formed at a higher level than the positive electrode layer 522 on the positive electrode layer 522 and the separator 521 formed at a higher level than the negative electrode layer 524 on the negative electrode layer 524 are in contact with each other such that the positive electrode layer 522 is physically separated from the negative electrode layer 522 and thus a gap is formed to prevent an electrical contact between the positive electrode layer 522 and the negative electrode layer 524, and the capacitor container 510 is filled with the electrolyte 560 so that the positive electrode layer 522 and the negative electrode layer 524 are connected in terms of transport of ions.

[0049] Specifically, the separator 521 is formed on each of the positive current collector plate 526 and the negative current collector plate 528. The separator 521 may be manufactured in a protruding convex shape of a circle or a polygon by applying an insulating layer, such as a photoresist, on the positive current collector plate 526 and the negative current collector plate 528 so as to obtain a continuous protruding pattern on the positive current collector plate 526 and the negative current collector plate 528 and by forming a convexly protruding insulator pattern of a predetermined design by removing the insulating layer except for the predetermined pattern design through etching, may be manufactured by directly forming the separator 521 on each of the positive current collector plate 526 and the negative current collector plate 528 in a convexly protruding pattern of a predetermined design using an insulator material, or may be manufactured by printing and drying an electrode paste made of a material such as activated carbon having a large unit surface area on one surface of each of the positive current collector plate 526 and the negative current collector plate 528, inserting and disposing the separator 521, which is separately formed of an insulating material, between the positive electrode layer 522 and the negative electrode layer 524, and thermocompression bonding or sintering the separator 521. The separator 521 may be formed by applying various process techniques.

[0050] As described above, when the separator 521 of the convex shape, which is formed by processing the insulator layer applied on each of the positive current collector plate 526 and the negative current collector plate 528, is repeatedly disposed in a continuous pattern, and the positive electrode layer 522 and the negative electrode layer 524, which are formed at a lower level than the separator 521, are formed by printing and thermocompression bonding or sintering an electrode paste, which is made of a material such as activated carbon having a large unit surface area, on one surface of each of the positive current collector plate 526 and the negative current collector plate 528, wherein the separator 521 is formed on each of the positive current collector plate 526 and the negative current collector plate 528, to be disposed to face each other, the final ends of the separators 521, which are formed to protrude from the positive current collector plate 526 and the negative current collector plate 528 in a circular or polygonal pattern at a higher level than the positive electrode layer 522 and the negative electrode layer 524, are in contact with each other to form a gap between the positive electrode layer 522 and the negative electrode layer 524 such that an insulating purpose may be achieved by spatially separating the positive electrode layer 522 from the negative electrode layer 524, which are formed at a lower level than the separator 521, to prevent an electrical contact therebetween.

[0051] A separation distance between the positive electrode layer 522 and the negative electrode layer 524 which are spatially separated by the separators 521 is varied according to several factors such as a width w, a distance d, and a step difference g of the separator 521 of a single unit convex shape which forms a continuously convexly protruding pattern. As the step difference g of the separator 521 of the unit convex shape is increased, the separation distance between the positive electrode layer 522 and the negative electrode layer 524 is increased, whereas, as the step difference g is decreased, the separation distance between the positive electrode layer 522 and the negative electrode layer 524 is decreased. Ion transport conductivities of the positive electrode layer 522 and the negative electrode layer 524, which are connected in terms of transport of positive ions and negative ions of the electrolyte 560, decrease or increase in inverse proportion to the separation distance between the positive electrode layer 522 and the negative electrode layer 524. Further, as the width w of the separator 521 of the unit convex shapes is large and the distance d between the separators 521 is small, an effective facing area between the positive electrode layer 522 and the negative electrode layer 524 is reduced. As the width w of the separator 521 of the unit convex shapes is small and the distance d between the separators 521 is large, the effective facing area therebetween is increased. The ion transport conductivity increases or decreases in proportion to the above description, i.e., the increase and decrease in effective facing area. That is, when an effective facing area between the positive electrode layer 522 and the negative electrode layer 524 is A, conductivity of the electrolyte 560 is , and a separation distance between the positive electrode layer 522 and the negative electrode layer 524, which is an average transport distance of the positive ions and the negative ions of the electrolyte 560, is L, electrical conductivity G has the following relational expression. The electrical conductivity G increases or decreases in proportion to the increase and decrease of the effective facing area A and the decrease and increase of the average transport distance of the positive ions and the negative ions, and an output characteristic P of a capacitor cell increases in proportion to the increase of the electrical conductivity G.

[00001]$G=.Math.\frac{A}{L},P=\frac{1}{4}.Math.{\mathrm{GV}}^2$

[0052] In the embodiment of the present invention, in order to improve conductivity due to ion transport of the electric double layer capacitor basic cell 500 having a separator-including electrode, it is preferable that the width w of the separator 521 or the distance d between the separator 521 and the another separator 521 adjacent thereto is formed in a range from 0.01 mm to 1 mm. This is because, when the width w of the separator 521 or the distance d between the separator 521 and the another separator 521 adjacent thereto is less than 0.01 mm, the separators 521 are disposed at a very fine distance and thus the effective facing area between the positive electrode layer 522 and the negative electrode layer 524 is significantly reduced such that an effect of improving conductivity due to the ion transport may be offset, and, when the width w of the separator 521 or the distance d between the separator 521 and the another separator 521 adjacent thereto exceeds 1 mm, a stress distribution effect is reduced at the end of the separator 521 supported on the negative current collector plate 528 such that the separation distance between the positive electrode layer 522 and the negative electrode layer 524 due to the separator 521 may be difficult to maintain.

[0053] Further, it is preferable that the step difference g between the separator 521 and each of the positive electrode layer 522 and the negative electrode layer 524 is formed to be less than or equal to 20 m, wherein the separator 521 is formed to convexly protrude to a higher level than each of the positive electrode layer 522 and the negative electrode layer 524. When the step difference g of the separator 521 is greater than or equal to 20 m, the separation distance between the positive electrode layer 522 and the negative electrode layer 524, which are separated from each other because the final ends of the separators 521 formed on the positive current collector plate 526 and the negative current collector plate 528 are in contact with each other, is greater than or equal to 40 m such that an effect of improving conductivity due to the ion transport in the electrolyte 560 may be significantly reduced.

[0054] According to the first embodiment of the present invention, when the positive electrode layer 522 and the negative electrode layer 524, each of which has the separator 521 in the convex shape being provided on each of the positive current collector plate 526 and the negative current collector plate 528, protrudes convexly in a continuous pattern of a predetermined design, and has a height that is higher than those of the positive electrode layer 522 and the negative electrode layer 524, are disposed as electrode pairs facing each other, the separators 521 are in contact with each other so that a relatively short physical distance corresponding to two times the step difference g between the separator 521 and each of the positive electrode layer 522 and the negative electrode layer 524 is formed between the positive electrode layer 522 and the negative electrode layer 524 so as to electrically insulate the positive electrode layer 522 from the negative electrode layer 524. Therefore, when compared with the conventional electric double layer capacitor basic cell, the relatively short distance between the positive electrode layer and the negative electrode layer, which are physically separated to be electrically insulated without a separator and connected in terms of transport of the positive ions and the negative ions of the electrolyte filling in the capacitor container, shortens an ion average transport distance, and an obstacle, which blocks the ion transport of the positive electrode layer and negative electrode layer, is not present to improve the conductivity in proportion to the increase in effective facing area. Consequently, efficiency in electrical energy storage and discharge may be improved and durability may be improved beyond durability limitation of the porous separator having relatively low durability.

[0055] FIG. 6A is a structural diagram of a double layer capacitor cell having a separator-including electrode electric according to a first embodiment of the present invention, and FIG. 6B is a schematic diagram illustrating a stack of electrode pairs of the double layer capacitor cell having a separator-including electrode electric according to the first embodiment of the present invention.

[0056] Referring to FIG. 6A, an electric double layer capacitor basic cell 600 having a separator-including electrode, in which a plurality of electrode pairs of the electric double layer capacitor basic cell having a separator-including electrode according to the first embodiment are stacked and connected in parallel, includes the capacitor container 510, the positive current collector plate 526 having one surface on which the separator-including electrode 520 is formed, and the negative current collector plate 528 having one surface on which the separator-including electrode 520 is formed, wherein the positive current collector plate 526 and the negative current collector plate 528 are disposed such that the separator-including electrodes 520 thereof face each other, other electrode pairs are stacked in an opposite direction so as to be connected to one surface of another negative current collector plate 528 on which the separator-including electrode 520 is stacked and formed adjacent to another surface of the negative current collector plate 528, and still other electrode pairs are alternately stacked again, in an opposite direction, adjacent to another positive current collector plate 5246 on which still other electrode pairs of the separator-including electrode 520 are stacked and formed adjacent to another positive current collector plate 526, on which the other electrode pairs of the separator-including electrode 520 are formed, so as to be contacted in the same polarity. Thus, the positive current collector plate 526 and the positive current collector plate 526, which have the same polarity and the plurality of separator-including electrodes 520 formed thereon, are disposed to be connected to each other, and the negative current collector plate 528 and the negative current collector plate 528, which have the same polarity and the plurality of separator-including electrodes 520 formed thereon, are disposed to be connected to each other.

[0057] The connected current collector plates are connected using the positive electrical lead 572, the negative electrical lead 574, a positive electrical lead connection line 610, and a negative electrical lead connection line 620, or the positive current collector plate 526 and the negative current collector plate 528, which have the same polarity, are directly connected and disposed to expand an electrode area of the facing electrode pairs which are physically separated to be electrically insulated and connected due to transport of positive ions and negative ions by filling the capacitor container 510 with the electrolyte 560.

[0058] Referring to FIGS. 6A and 6B, stacking of the electrode pairs of the electric double layer capacitor basic cell 600 having a separator-including electrode, in which the plurality of electrode pairs of the electric double layer capacitor basic cell having a separator-including electrode according to the first embodiment of the present invention are stacked and connected in parallel, is performed such that the other electrode pairs are stacked in an opposite direction so as to connect the positive current collector plate 526 with the separator-including electrode 520 formed on one surface thereof and the negative current collector plate 528 with the separator-including electrode 520 formed on one surface thereof to the another negative current collector plate 528 with the other electrode pairs of the separator-including electrode 520 formed thereon, wherein the another negative current collector plate 528 is stacked adjacent to the negative current collector plate 528 with the facing electrode pairs of the separator-including electrode 520 formed thereon, and still other electrode pairs are alternately stacked again, in an opposite direction, adjacent to another positive current collector plate 526 on which still other electrode pairs of the separator-including electrode 520 are stacked and formed adjacent to another positive current collector plate 526, on which the other electrode pairs of the separator-including electrode 520 are formed, so that the same polarities are in contact with each other. Thus, the positive current collector plate 526 and the positive current collector plate 526, which have the same polarity and the plurality of separator-including electrodes 520 formed thereon, are disposed to be connected to each other, and the negative current collector plate 528 and the negative current collector plate 528, which have the same polarity and the plurality of separator-including electrodes 520 formed thereon, are disposed to be connected to each other.

[0059] The electric double layer capacitor basic cell 600 having a separator-including electrode according to the first embodiment of the present invention includes the capacitor container 510, the positive current collector plate 526 having one surface on which the separator-including electrode 520 is formed, and the negative current collector plate 528 having one surface on which the separator-including electrode 520 is formed, wherein the positive current collector plate 526 and the negative current collector plate 528 are disposed such that the separator-including electrodes 520 thereof face each other. The electric double layer capacitor basic cell 600 is formed such that other electrode pairs are stacked in an opposite direction so as to be connected to one surface of another negative current collector plate 528 on which the separator-including electrode 520 is stacked and formed adjacent to another surface of the negative current collector plate 528, and still other electrode pairs are alternately stacked again, in an opposite direction, adjacent to another positive current collector plate 5246 on which still other electrode pairs of the separator-including electrode 520 are stacked and formed adjacent to another positive current collector plate 526, on which the other electrode pairs of the separator-including electrode 520 are formed so that the same polarities are in contact with each other. Thus, the positive current collector plate 526 and the positive current collector plate 526, which have the same polarity and the plurality of separator-including electrodes 520 formed thereon, are disposed to be connected to each other, and the negative current collector plate 528 and the negative current collector plate 528, which have the same polarity and the plurality of separator-including electrodes 520 formed thereon, are disposed to be connected to each other. The connected current collector plates are connected using the positive electrical lead 572, the negative electrical lead 574, a positive electrical lead connection line 610, and a negative electrical lead connection line 620, or the positive current collector plate 526 and the negative current collector plate 528, which have the same polarity, are directly connected and disposed to expand an electrode area of the facing electrode pairs which are physically separated to be electrically insulated and connected, and the capacitor container 510 is filled with an electrolyte 560 so that the facing electrode pairs are connected in terms of transport of positive ions and negative ions. Consequently, when compared with the conventional electric double layer capacitor cells, the plurality of electrode pairs may be stacked without the separator such that efficiency in electrical energy storage and discharge may be improved and durability may be improved beyond durability limitation of the porous separator.

[0060] FIG. 8A is a schematic structural diagram of an energy storage device in which a plurality of electric double layer capacitor cells having separator-including electrodes according to the first embodiment of the present invention are connected in series, FIG. 8B is a schematic internal structural side view of an energy storage device container in which the plurality of electric double layer capacitor cells having separator-including electrodes of the present invention are connected in series, and FIG. 8C is a schematic diagram of the energy storage device container in which the plurality of electric double layer capacitor cells having separator-including electrodes of the present invention are connected in series.

[0061] Referring to FIG. 8A, an energy storage device 800, in which the plurality of electric double layer capacitor basic cells 600 having separator-including electrodes are connected in series, according to the first embodiment includes an energy storage device container 810, and the electric double layer capacitor basic cells 600 having separator-including electrodes in the energy storage device container 810, wherein a final end of the electric double layer capacitor basic cell 600 having a separator-including electrode, a starting end of another electric double layer capacitor basic cell 600 having a separator-including electrode which is connected adjacent to a front surface of the negative current collector plate 528, and a front surface of the positive current collector plate 526 are stacked to be connected in series, and a final end of the another electric double layer capacitor basic cell 600 having a separator-including electrode, a starting end of still another electric double layer capacitor basic cell 600 having a separator-including electrode which is connected adjacent to the front surface of the negative current collector plate 528, and the front surface of the positive current collector plate 526 are stacked to be connected in series such that the plurality of electric double layer capacitor basic cells 600 having separator-including electrodes are disposed to be connected in series. A cell sill 814 is formed around an edge of a contact surface on which the front surface of the positive current collector plate 526 and the front surface of the negative current collector plate 528 are connected in series such that the plurality of electric double layer capacitor basic cells 600 having separator-including electrodes are divided to be connected in series.

[0062] Referring to FIGS. 8A to 8C, the energy storage device 800, in which the plurality of electric double layer capacitor basic cells 600 having separator-including electrodes are connected in series, according to the first embodiment is formed such that the electric double layer capacitor basic cells 600 having separator-including electrodes in the energy storage device container 810, wherein a final end of the electric double layer capacitor basic cell 600 having a separator-including electrode, a starting end of another electric double layer capacitor basic cell 600 having a separator-including electrode which is connected adjacent to a front surface of the negative current collector plate 528, and a front surface of the positive current collector plate 526 are stacked to be connected in series, a final end of the another electric double layer capacitor basic cell 600 having a separator-including electrode, a starting end of still another electric double layer capacitor basic cell 600 having a separator-including electrode which is connected adjacent to the front surface of the negative current collector plate 528, and the front surface of the positive current collector plate 526 are stacked to be connected in series such that the plurality of electric double layer capacitor basic cells 600 having separator-including electrodes are disposed to be connected in series, and the cell sill 814 is provided around the edge of the contact surface on which the front surface of the positive current collector plate 526 and the front surface of the negative current collector plate 528 are connected in series such that the plurality of electric double layer capacitor basic cells 600 having separator-including electrodes, which are connected in series, are divided to be connected in series.

[0063] The above-described energy storage device 800, in which the plurality of electric double layer capacitor basic cells 600 having separator-including electrodes are connected in series, according to the first embodiment is formed as the electric double layer capacitor basic cells 600 having separator-including electrodes in the energy storage device container 810, wherein a final end of the electric double layer capacitor basic cell 600 having a separator-including electrode, a starting end of another electric double layer capacitor basic cell 600 having a separator-including electrode which is connected adjacent to a front surface of the negative current collector plate 528, and a front surface of the positive current collector plate 526 are stacked to be connected in series, a final end of the another electric double layer capacitor basic cell 600 having a separator-including electrode, a starting end of still another electric double layer capacitor basic cell 600 having a separator-including electrode which is connected adjacent to the front surface of the negative current collector plate 528, and the front surface of the positive current collector plate 526 are stacked to be connected in series such that the plurality of electric double layer capacitor basic cells 600 having separator-including electrodes are disposed to be connected in series, and the cell sill 814 is formed around an edge of a contact surface on which the front surface of the positive current collector plate 526 and the front surface of the negative current collector plate 528 are connected in series such that the plurality of electric double layer capacitor basic cells 600 having separator-including electrodes are divided to be connected in series. Therefore, when compared with the energy storage device in which a plurality of electric double layer capacitor cells are connected in series, the plurality of electric double layer capacitor cells having separator-including electrodes may be connected in series in the energy storage device without a separate circuit board. Consequently, there is an advantage in that characteristic distortion due to an increase in contact resistance resulting from a serial connection using an external printed circuit board is significantly reduced such that the need for a correction circuit is significantly reduced, functional durability limitation due to using the external printed circuit board is reduced, and there is no need to use a separate device for the external printed circuit board to reduce manufacturing costs and reduce mechanical durability limitation.

[0064] FIG. 5D is a side view of a structure of a separator-including double electrode current collector plate according to a second embodiment of the present invention.

[0065] Referring to FIG. 5D, a separator-including double electrode current collector plate 530 according to the second embodiment includes a current collector plate 527, a separator-including electrode 520 provided on both surfaces of the current collector plate 527 and including an electrode layer 523 formed on the both surfaces of the current collector plate 527, and separators 521 made of an insulating material and having a convex shape which protrudes convexly from the both surfaces of the current collector plate 527 in a continuous pattern of a predetermined design and of which a height is higher than that of the electrode layer 523.

[0066] FIG. 7A is a schematic structural diagram of a separator-including double electrode electric double layer capacitor cell according to the second embodiment of the present invention, and FIG. 7B is a schematic diagram illustrating a stack of electrode pairs of the separator-including double electrode electric double layer capacitor cell according to the second embodiment of the present invention.

[0067] Referring to FIG. 7A, an electric double layer capacitor cell 700 having a separator-including electrode according to the second embodiment includes a capacitor container 510, a positive current collector plate 526 with a separator-including electrode 520 formed on one surface thereof, and the separator-including double electrode current collector plate 530 with the separator-including electrode 520 on both surfaces thereof, wherein the positive current collector plate 526 is disposed to face one surface of the separator-including double electrode current collector plate 530 to form electrode pairs, one surface of another separator-including double electrode current collector plate 530 is stacked to face the other surface of the separator-including double electrode current collector plate 530 to form other electrode pairs, one surface of still another separator-including double electrode current collector plate 530 is stacked to face the other surface of the another separator-including double electrode current collector plate 530 to form still other electrode pairs, thereby stacking the plurality of separator-including double electrode current collector plates 530 to form the plurality of electrode pairs, and the other surface of the lastly stacked separator-including double electrode current collector plate 530 is stacked and disposed to face a negative current collector plate 528 with the separator-including electrode 520 formed on one surface thereof, thereby forming the electrode pairs at a final end of the electric double layer capacitor cell 700. The same polarities of the electrode pairs are directly connected or connected using a positive electrical lead 572, a negative electrical lead 574, a positive electrical lead connection line 610, and a negative electrical lead connection line 620 such that the facing electrode pairs, which are physically separated and electrically insulated, are disposed to be connected in parallel so as to expand an electrode area of the facing electrode pairs and are connected in terms of transport of positive ions and negative ions by filling the capacitor container 510 with an electrolyte 560.

[0068] Referring to FIGS. 7A and 7B, electrode stacking of the electric double layer capacitor cell 700 having a separator-including electrode according to the second embodiment is performed such that the positive current collector plate 526 with the separator-including electrode 520 formed on one surface thereof is stacked to face one surface of the separator-including double electrode current collector plate 530 with the separator-including electrode 520 on both surfaces thereof to form electrode pairs, one surface of another separator-including double electrode current collector plate 530 is stacked to face the other surface of the separator-including double electrode current collector plate 530 to form other electrode pairs, one surface of still another separator-including double electrode current collector plate 530 is stacked to face the other surface of the another separator-including double electrode current collector plate 530 to form still other electrode pairs, thereby stacking the plurality of separator-including double electrode current collector plates 530 to form the plurality of electrode pairs, and, the other surface of the lastly stacked separator-including double electrode current collector plate 530 is stacked and disposed to face a negative current collector plate 528 with the separator-including electrode 520 formed on one surface thereof, thereby forming the electrode pairs at a final end of the electric double layer capacitor cell 700.

[0069] The electric double layer capacitor cell 700 having a separator-including electrode according to the second embodiment of the present invention includes the capacitor container 510, a positive current collector plate 526 with a separator-including electrode 520 formed on one surface thereof, and the separator-including double electrode current collector plate 530 with the separator-including electrode 520 on both surfaces thereof, wherein the positive current collector plate 526 is disposed to face one surface of the separator-including double electrode current collector plate 530 to form electrode pairs, one surface of another separator-including double electrode current collector plate 530 is stacked to face the other surface of the separator-including double electrode current collector plate 530 to form other electrode pairs, one surface of still another separator-including double electrode current collector plate 530 is stacked to face the other surface of the another separator-including double electrode current collector plate 530 to form still other electrode pairs, thereby stacking the plurality of separator-including double electrode current collector plates 530 to form the plurality of electrode pairs, and the other surface of the lastly stacked separator-including double electrode current collector plate 530 is stacked and disposed to face a negative current collector plate 528 with the separator-including electrode 520 formed on one surface thereof, thereby forming the electrode pairs at a final end of the electric double layer capacitor cell 700. The same polarity of the electrode pairs are directly connected or connected using a positive electrical lead 572, a negative electrical lead 574, a positive electrical lead connection line 610, and a negative electrical lead connection line 620 such that the facing electrode pairs, which are physically separated and electrically insulated, are disposed to be connected in parallel so as to expand an electrode area of the facing electrode pairs and are connected in terms of transport of positive ions and negative ions by filling the capacitor container 510 with an electrolyte 560. Therefore, when compared with the conventional electric double layer capacitor cell, the positive electrode layer and the negative electrode layer of each electrode pair are physically separated and electrically insulated without a separator, and transport distances of positive ions and negative ions between the positive electrode layer and the negative electrode layer, which are connected in terms of transport of the positive ions and the negative ions, are significantly reduced such that conductivity may be improved in proportion to the reduced transport distances. Further, a plurality of electrode pairs may be stacked without the separator, and adjacent electrode pairs being stacked and a single current collector plate may be used as a common current collector plate such that an electrical energy storage density and discharge efficiency may be improved, and durability may be improved beyond durability limitation of the porous separator. FIG. 9 is a schematic structural diagram of an energy storage device in which the plurality of separator-including electrode electric double layer capacitor cells according to the second embodiment of the present invention are connected in series.

[0070] Referring to FIG. 9, an energy storage device 900, in which a plurality of electric double layer capacitor cells 700 having separator-including double electrodes are connected in series, according to the second embodiment includes the energy storage device container 810, electric double layer capacitor cells 700 having separator-including double electrodes in the energy storage device container 810, wherein a front surface of the negative current collector plate 528, which is provided at a final end of the electric double layer capacitor cell 700 having a separator-including double electrode, is stacked to be connected in series to a front surface of the positive current collector plate 526 provided at a starting end of another electric double layer capacitor cell 700 having a separator-including double electrode which is connected adjacent to the electric double layer capacitor cell 700, a front surface of the positive current collector plate 526 provided at a starting end of still another electric double layer capacitor cell 700 having a separator-including double electrode, which is connected adjacent to a front surface of the negative current collector plate 528 provided at a final end of the another electric double layer capacitor cell 700 having a separator-including double electrode, is stacked to be connected in series, the plurality of electric double layer capacitor cells 700 having separator-including double electrodes are disposed to be connected in series, and a cell sill 814 is formed around an edge of a contact surface on which the front surface of the positive current collector plate 526 and the front surface of the negative current collector plate 528 are connected in series such that the plurality of electric double layer capacitor cells 700 having separator-including double electrodes are connected in series.

[0071] The above-described energy storage device 900, in which the plurality of electric double layer capacitor cells 700 having separator-including double electrode are connected in series, according to the second embodiment of the present invention is formed such that the front surface of the negative current collector plate 528, which is provided at the final end of the electric double layer capacitor cell 700 having a separator-including double electrode, is stacked in the energy storage device container 810, to be connected in series to the front surface of the positive current collector plate 526 provided at the starting end of another electric double layer capacitor cell 700 having a separator-including double electrode which is connected adjacent to the electric double layer capacitor cell 700, a front surface of the positive current collector plate 526 provided at a starting end of still another electric double layer capacitor cell 700 having a separator-including double electrode, which is connected adjacent to a front surface of the negative current collector plate 528 provided at a final end of the another electric double layer capacitor cell 700 having a separator-including double electrode, is stacked to be connected in series, the plurality of electric double layer capacitor cells 700 having separator-including double electrodes are disposed to be connected in series, and a cell sill 814 is formed around an edge of a contact surface on which the front surface of the positive current collector plate 526 and the front surface of the negative current collector plate 528 are connected in series such that the plurality of electric double layer capacitor cells 700 having separator-including double electrodes are connected in series. Therefore, when compared with the conventional energy storage device in which a plurality of electric double layer capacitor cells are connected in series, the plurality of electric double layer capacitor cells having separator-including electrodes may be connected in series in the energy storage device without a separate circuit board. Consequently, there is an advantage in that characteristic distortion due to an increase in contact resistance resulting from a serial connection is significantly reduced such that the need for a correction circuit is significantly reduced, functional durability limitation due to using an external printed circuit board is reduced, and there is no need to use a separate device for the external printed circuit board such as to reduce manufacturing costs and mechanical durability limitation.

[0072] FIG. 5E is a side view of a structure of a vertical stripe separator-including electrode current collector plate according to a third embodiment of the present invention, and FIG. 5F is a plan view of the structure of the vertical stripe separator-including electrode current collector plate according to the third embodiment of the present invention.

[0073] Referring to FIGS. 5E to 5F, a vertical stripe separator-including electrode current collector plate 540 according to the third embodiment of the present invention includes a current collector plate 527, an electrode layer 523 formed on one surface of the current collector plate 527, and a vertical stripe separator 541 formed to protrude from one surface of the current collector plate 527 in a rod shape, elongated in a length direction of the current collector plate 527 at a predetermined distance in a width direction thereof, and having a height that is higher than that of the electrode layer 523.

[0074] In the electric double layer capacitor basic cell 500 having a separator-including electrode, in the electric double layer capacitor basic cell 600 having a separator-including electrode, and in the energy storage device 800 in which the plurality of electric double layer capacitor basic cells 600 having separator-including electrodes are connected in series, the separator-including electrode 520, the positive current collector plate 526, the separator-including electrode 520, and the negative current collector plate 528 may be replaced with the above-described vertical stripe separator-including electrode current collector plate 540 according to the third embodiment of the present invention.

[0075] FIG. 50 is a side view of a structure of a vertical stripe separator-including double electrode current collector plate according to a fourth embodiment of the present invention.

[0076] Referring to FIG. 5G, a vertical stripe separator-including electrode current collector plate 550 according to the fourth embodiment of the present invention includes a current collector plate 527, an electrode layer 523 formed on both surfaces of the current collector plate 527, vertical stripe separators 541 formed to protrude from the both surfaces of the current collector plate 527 in a rod shape, elongated in a length direction of the current collector plate 527 at a predetermined distance in a width direction thereof, and having a height that is higher than that of the electrode layer 523. In the electric double layer capacitor cell 700 having a separator-including double electrode and the energy storage device 900 in which the plurality of electric double layer capacitor cells 700 having separator-including double electrodes are connected in series, the separator-including double electrode current collector plate 530 may be replaced with the above-described vertical stripe separator-including double electrode current collector plate 550 according to the fourth embodiment of the present invention.