Pouch type battery cell including electrode lead of bending structure

Abstract

The present invention provides a battery cell including: an electrode assembly configured of a positive electrode, a negative electrode, and a separation membrane; and a battery case in which a sealing surplus part is formed at an external circumference in a state that the electrode assembly is built in a receiving unit, wherein the battery case is formed of a sheet-shaped structure having a first surface and a second surface opposite to the first surface, an electrode terminal of the sheet-shaped structure is protruded through one side sealing surplus part of the battery case, and the electrode terminal is in contact with one surface or the other surface opposite to the one surface of the sealing surplus part in a state that the electrode terminal is bent in the first surface direction or the second surface direction of the battery case at the protrude part.

Claims

1. A battery cell comprising: an electrode assembly configured of a positive electrode, a negative electrode, and a separation membrane; and a battery case in which a sealing surplus part is formed at an external circumference in a state that the electrode assembly is built in a receiving unit, wherein the battery case is formed of a sheet-shaped structure having a first surface and a second surface opposite to the first surface, an electrode terminal of the sheet-shaped structure is protruded through one side of the sealing surplus part of the battery case, and the electrode terminal is in contact with a first outer surface of the sealing surplus part or a second outer surface of the sealing surplus part opposite to the first outer surface of the sealing surplus part in a state that a protruded part of the electrode terminal is bent to overlap one of the first outer surface or the second outer surface of the sealing surplus part, an adherence member is interposed between and directly contacting the protruded part of the electrode terminal and the first outer surface or the second outer surface of the sealing surplus part to maintain the bend of the protruded part of the electrode terminal, and the electrode terminal has an uninterrupted width over an entire length of the electrode terminal.

2. The battery cell of claim 1, wherein the electrode assembly is made of a folding structure, a stacked structure, a stacked/folding structure, or a lamination/stacked structure.

3. The battery cell of claim 1, wherein the battery case is made of a laminate sheet including a resin outer layer, a barrier metal layer, and a heat-fusible resin sealant layer.

4. The battery cell of claim 1, wherein the adherence member is a double-sided adhesive tape.

5. The battery cell of claim 1, wherein the adherence member is a curable adhesive.

6. The battery cell of claim 1, wherein the adherence member is an adhesive.

7. The battery cell of claim 1, wherein the first outer surface of the sealing surplus part is formed at the first surface of the battery case, the second outer surface of the sealing surplus part is positioned at the second surface of the battery case, and the protruded part of the electrode terminal is bent by 180 degrees so that the electrode terminal is in contact with the first outer surface or the second outer surface of the sealing surplus part.

8. The battery cell of claim 1, wherein the electrode terminal is made of a first electrode lead and a second electrode lead.

9. The battery cell of claim 8, wherein electrode tabs of the electrode assembly are bonded to the end of the first electrode lead and the end of the second electrode lead that are positioned at the receiving unit, thereby forming an electrical connection.

10. The battery cell of claim 9, wherein the first electrode lead and the second electrode lead are bonded to the electrode tabs by laser welding.

11. The battery cell of claim 9, wherein the first electrode lead is bent to overlap and to contact the first outer surface of the sealing surplus part, and the second electrode lead is bent to overlap and contact the second outer surface of the sealing surplus part.

12. The battery cell of claim 11, wherein the adherence member is a first adherence member interposed between the first electrode lead and the first outer surface of the sealing surplus part, and a second adherence member is interposed between the second electrode lead and the second outer surface of the sealing surplus part.

13. The battery cell of claim 1, wherein in the sealing surplus part, an insulating film is interposed at an interface of the electrode terminal and the battery case.

14. The battery cell of claim 1, wherein the battery cell is a lithium rechargeable battery.

15. A battery pack comprising two or more battery cells of claim 1.

16. A device comprising the battery pack of claim 15 as a power source.

17. The device of claim 16, wherein the device is selected from a mobile phone, a wearable electronic device, a portable computer, a smart pad, a netbook, a light electronic vehicle (LEV), an electric car, a hybrid electric vehicle, a plug-in hybrid electric car, and an electric power storage device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is an exploded perspective view of a conventional pouch-type battery;

(2) FIG. 2 is a bottom view of the pouch-type battery of FIG. 1;

(3) FIG. 3 is a first horizontal plan view of a battery cell according to an example of the present invention;

(4) FIG. 4 is a lateral view of the battery cell of FIG. 3;

(5) FIG. 5 is a second horizontal plan view of a battery cell according to another example of the present invention;

(6) FIG. 6 is a lateral view of the battery cell of FIG. 5;

(7) FIG. 7 is a first horizontal plan view and a second horizontal plan view of a battery cell according to another example of the present invention; and

(8) FIG. 8 is a lateral view of the battery cell of FIG. 7.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(9) Hereinafter, the present invention will be described with reference to the drawings according to the exemplary embodiment of the present invention, however, this is for easier understanding of the present invention, and the scope of the present invention is not limited thereby.

(10) FIG. 3 schematically shows a first horizontal plan view of a battery cell according to an example of the present invention, and FIG. 4 schematically shows a lateral view of the battery cell of FIG. 3.

(11) Referring to FIG. 3 and FIG. 4, a battery cell 100 includes an electrode assembly 110 configured of a positive electrode, a negative electrode, and a separation membrane, and a battery case 120.

(12) The battery case 120 is formed of a sheet-shaped structure, a receiving unit 121 in which the electrode assembly 110 is housed is formed, and a sealing surplus part 130 is formed at an upper end of an external circumference of the battery case 120.

(13) An electrode terminal 140 is formed via the sealing surplus part 130 to be protruded, and is bent by 180 degrees in a first surface direction as the receiving unit 121 direction of the battery case 120 at the protruded part to be in contact with an inner surface of the sealing surplus part 130.

(14) An adherence member 150 is interposed between the electrode terminal 140 and the sealing surplus part 130 to maintain the bend of the electrode terminal 140 and the contact state for the sealing surplus part 130.

(15) The adherence member 150 may be made of a double-sided adhesive tape, a curable adhesive, or an adhesive.

(16) FIG. 5 schematically shows a second horizontal plan view of a battery cell according to another example of the present invention, and FIG. 6 schematically shows a lateral view of the battery cell of FIG. 5.

(17) Referring to FIG. 5 and FIG. 6, an electrode terminal 240 is formed via a sealing surplus part 230 to be protruded, and is bent by 180 degrees in a second surface direction as a cover 222 direction of a battery case 220 at the protruded part to be in contact with the outer surface of the sealing surplus part 230.

(18) An adherence member 250 is interposed between the electrode terminal 240 and the sealing surplus part 230 to maintain the bend of the electrode terminal 240 and the contact state for the sealing surplus part 230.

(19) The adherence member 250 may be made of the double-sided adhesive tape, the curable adhesive, or the adhesive.

(20) The rest of the structure except for the bending direction of the electrode terminal is the same as the example described in FIG. 3 and FIG. 4 such that the description thereof is omitted.

(21) FIG. 7 schematically shows a first horizontal plan view and a second horizontal plan view of a battery cell according to another example of the present invention, and FIG. 8 schematically shows a lateral view of the battery cell of FIG. 7.

(22) Referring to FIG. 7 and FIG. 8, an electrode terminal 340 is made of a first electrode lead 341 and a second electrode lead 342.

(23) Electrode tabs 311 of an electrode assembly 310 are bonded to ends of the first electrode lead 341 and the second electrode lead 342, thereby forming an electrical connection.

(24) The first electrode lead 341 and the second electrode lead 342 are bonded to the electrode tabs 311 by laser welding in a state in which the ends are mutually overlapped.

(25) The first electrode lead 341 is bent in the first surface direction of a battery case 320 to be in contact with the inner surface of a sealing surplus part 330, and the second electrode lead 342 is bent in the second surface direction of the battery case 320 to be in contact with the outer surface of the sealing surplus part 330.

(26) An adherence member 350 is interposed between the first electrode lead 341 and the inner surface of the sealing surplus part 330 and between the second electrode lead 342 and the outer surface of the sealing surplus part 330 to maintain the bend of the electrode terminal 340 and the contact state for the sealing surplus part 330.

(27) The adherence member 350 may be made of the double-sided adhesive tape, the curable adhesive, or the adhesive.

(28) In the sealing surplus part 330, an insulating film (not shown) is interposed at an interface of the electrode terminal 340 and the battery case 320.

(29) The rest of the structure except for a structure in which the electrode terminal is made of the first electrode lead and the second electrode lead of two units and the bending direction of the electrode terminal is the same as the example described in FIG. 3 and FIG. 4 such that the description thereof is omitted.

(30) While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.