Secondary cylindrical battery having piezoelectric element and thermoelectric element

Abstract

A cylindrical rechargeable battery including a positive electrode, a negative electrode, and a separator is provided. The positive electrode includes a positive electrode tab, and a piezoelectric element and a thermoelectric element are formed at edges of the positive electrode tab.

Claims

1. A cylindrical rechargeable battery comprising: a positive electrode, the positive electrode including: a positive electrode tab having a pair of opposed edges; a piezoelectric element at at least one edge of the pair of opposed edges of the positive electrode tab; and a thermoelectric element at the positive electrode tab; a negative electrode; and a separator.

2. The cylindrical rechargeable battery of claim 1, wherein the positive electrode tab has a rectangular strip shape having a long length in comparison with a width.

3. The cylindrical rechargeable battery of claim 2, wherein the thermoelectric element is formed at another edge of the pair of opposed edges of the positive electrode tab in a longitudinal direction thereof.

4. The cylindrical rechargeable battery of claim 1, wherein accommodating spaces in which the piezoelectric element and the thermoelectric element are mountable are formed at the pair of opposed edges of the positive electrode tab.

5. The cylindrical rechargeable battery of claim 4, wherein the accommodating spaces have a stepped shape.

6. The cylindrical rechargeable battery of claim 1, wherein the piezoelectric element is formed at both edges of the pair of opposed edges of the positive electrode tab.

7. The cylindrical rechargeable battery of claim 6, wherein the thermoelectric element is formed at a central portion of the positive electrode tab.

8. The cylindrical rechargeable battery of claim 7, wherein an indentation is formed into the positive electrode tab.

9. The cylindrical rechargeable battery of claim 8, wherein the thermoelectric element is accommodated in the indentation.

10. The cylindrical rechargeable battery of claim 1, wherein electrical energy generated by the piezoelectric element is transferred to the thermoelectric element through the positive electrode tab.

11. A cylindrical rechargeable battery comprising: a positive electrode; a negative electrode, the negative electrode includes including: a negative electrode tab having a pair of opposed edges; a piezoelectric element at at least one edge of the pair of opposed edges of the negative electrode tab; and a thermoelectric element at the negative electrode tab; and a separator.

Description

DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 illustrates a plan view of a cylindrical rechargeable battery in which a piezoelectric element and a thermoelectric element are formed at a positive electrode tab thereof according to an exemplary embodiment of the present invention.

(2) FIG. 2 illustrates a cross-sectional view taken along a dotted line C of FIG. 1.

(3) FIG. 3 illustrates a top plan view according to another exemplary embodiment of the present invention.

(4) FIG. 4 illustrates a cross-sectional view taken along a dotted line C of FIG. 3.

(5) FIG. 5 illustrates a cross-sectional view of an electrode tab taken along the dotted line C of FIG. 3.

(6) FIG. 6 illustrates a top plan view according to another exemplary embodiment of the present invention.

(7) FIG. 7 illustrates a cross-sectional view of an electrode tab taken along the dotted line C of FIG. 3.

MODE FOR INVENTION

(8) The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. As those skilled in the art wherein realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

(9) In addition, unless explicitly described to the contrary, the word “comprise” and variations such as “comprises” or “comprising” will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

(10) In addition, throughout the specification, when referred to as “cross-section”, it indicates when a cross-section which cuts a target part vertically is seen from the side.

(11) In addition, throughout the specification, when referred to as “top view”, it indicates when a target portion is viewed from above.

(12) Further, since a structure and an operating principle of the “piezoelectric element” and the “thermoelectric element” are known techniques, a description thereof will be omitted.

(13) FIG. 1 illustrates a plan view of a cylindrical rechargeable battery in which a piezoelectric element and a thermoelectric element are formed at a positive electrode tab thereof according to an exemplary embodiment of the present invention. FIG. 2 illustrates a cross-sectional view taken along a dotted line C of FIG. 1.

(14) Referring to FIG. 1 and FIG. 2, a piezoelectric element 102 and a thermoelectric element 103 are formed at edges A and B of a positive electrode tab 101 of a cylindrical rechargeable battery 100. For convenience of explanation, FIG. 1 illustrates an enlarged view of a portion where the positive electrode tab 101 is formed at an uncoated portion 104 of a positive electrode 105 before the positive electrode 105 and a negative electrode (not illustrated) are wound with the separator interposed therebetween.

(15) The positive electrode tab 101 may have a rectangular strip shape having a long length in comparison with a width. The piezoelectric element 102 and the thermoelectric element 103 may be formed at opposite edges A and B in a longitudinal direction. As described above, the edges A and B are portions where stresses generated by repeated expansion of the negative electrode (not illustrated) are concentrated during charging and discharging of the cylindrical rechargeable battery 100. This stress may be converted into battery energy through the piezoelectric element 102. In addition, the battery energy may operate the thermoelectric element 103 to absorb thermal energy generated in the cylindrical rechargeable battery 100 during the charge and discharge process. The electrical energy produced by the piezoelectric element 102 may be transferred to the thermoelectric element 103 through various paths. For example, the electrical energy may be transferred through a metal connector (not illustrated) electrically connecting to the piezoelectric element 102 and the thermoelectric element 103. Meanwhile, in the exemplary embodiments illustrated in FIG. 1 to FIG. 6, the electrical energy generated by the piezoelectric element 102 may be transferred to the thermoelectric element 103 through the positive electrode tab 101.

(16) In particular, a portion where the positive electrode tab 101 is formed is a portion where a lot of thermal energy is intensively generated by a rapid flow of current in the charging and discharging process of the cylindrical rechargeable battery 100. This thermal energy may be absorbed and controlled by the thermoelectric element 103.

(17) FIG. 3 illustrates a top plan view according to another exemplary embodiment of the present invention. FIG. 4 illustrates a cross-sectional view taken along a dotted line C of FIG. 3. FIG. 5 illustrates a cross-sectional view of an electrode tab

(18) taken along the dotted line C of FIG. 3.

(19) Referring to FIG. 3 to FIG. 5, accommodating spaces 110 and 120 in which the piezoelectric element 102 and the thermoelectric element 103 are mountable may be formed at opposite edges A and B of the positive electrode tab 101 of a cylindrical rechargeable battery 200. A form of the accommodating spaces 110 and 120 is not particularly limited, but as an example, it may be formed in the form of a step. An entire part or a portion of the piezoelectric element 102 may be formed in the accommodating space 110 of the edge A. An entire part or a portion of the thermoelectric element 103 may be formed in the accommodating space 120 of the edge B.

(20) Through this structure, the piezoelectric element 102 and the thermoelectric element 103 of various shapes and volumes may be applied to the positive electrode tab 101, and the piezoelectric element 102 and the thermoelectric element 103 may be prevented from escaping from the positive electrode tab 101 by a stress generated in a direction D during the charge and discharge process. Herein, the direction D indicates a direction perpendicular to a longitudinal direction of the positive electrode tab 101 in a direction parallel to a surface where the positive electrode 105 is formed with respect to the ground.

(21) FIG. 6 illustrates a top plan view according to another exemplary embodiment of the present invention. FIG. 7 illustrates a cross-sectional view of an electrode tab

(22) taken along the dotted line C of FIG. 6.

(23) Referring to FIG. 6 and FIG. 7, the piezoelectric element 102 may be formed at edges A and B of the positive electrode tab 101 of a cylindrical rechargeable battery 300, and the thermoelectric element 103 may be formed at a central portion of the positive electrode tab 101.

(24) As described above, the edges A and B are portions where stresses generated by repeated expansion of the negative electrode (not illustrated) are concentrated during charging and discharging of the cylindrical rechargeable battery 300. Therefore, only the piezoelectric element 102 may be installed at the edges A and B to secure more battery energy. In addition, it is possible to easily control the high thermal energy generated in the cylindrical rechargeable battery 300 of high capacity and high output by operating the thermoelectric element 103 with the battery energy.

(25) The accommodating spaces 110 and 120 in which the piezoelectric element 102 is mountable may be formed at opposite edges A and B of the positive electrode tab 101. A form of the accommodating spaces 110 and 120 is not particularly limited, but as an example, they may be formed in the form of a step. An entire part or a portion of the piezoelectric element 102 may be formed in the accommodating spaces 110 and 120 of the edges A and B.

(26) An indentation 130 in which the thermoelectric element 103 is accommodatable may be formed in a central portion of the positive electrode tab 101. The indentation 130 may be formed to have a structure indented into the positive electrode tab 101, and an entire part or a portion of the thermoelectric element 103 may be accommodated in the indentation 130. Through this structure, the thermoelectric element 103 of various shapes and volumes may be applied to the positive electrode tab 101. In addition, an area in which the thermoelectric element 103 contacts the positive electrode tab 101 may be maximized so that thermal energy generated in the positive electrode tab 101 may be quickly transferred to the thermoelectric element 103 to be cooled.

(27) As a modified example, the piezoelectric element 102 and the thermoelectric element 103 described above may be equally applied to the negative electrode tab (not illustrated).

(28) Those of ordinary skill in the field of the present invention will be able to make various applications and modifications within the scope of the present invention based on the contents.

INDUSTRIAL APPLICABILITY

(29) As described above, in the rechargeable battery according to the exemplary embodiment of the present invention, the piezoelectric element and the thermoelectric element are formed on the positive electrode tab, thereby changing the stress generated during the expansion of the negative electrode to electrical energy using the piezoelectric element, and the electrical energy may be used to operate the thermoelectric element to thereby control the thermal energy issued inside the battery.