Battery cell including stepped structure

Patent metadata

Field	Value
Publication number	US-10629940-B2
Application number	US-201414647228-A
Country	US
Kind code	B2
Filing date	Mar 3, 2014
Priority date	Mar 4, 2013
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

Disclosed herein is a battery cell including an electrode assembly configured to have a structure in which two or more electrode rolls are stacked in a height direction on the basis of a plane, wherein the electrode rolls have the same size or at least two of the electrode rolls have different sizes, and the electrode rolls having different sizes are stacked to form one or more stepped structures in width and/or height.

First claim

The invention claimed is:

1. A battery cell comprising an electrode assembly configured to have a structure in which at least two electrode rolls are stacked in a height direction on the basis of a plane, wherein
the at least two electrode rolls have different sizes,
the at least two electrode rolls are stacked to form one or more stepped structures in width and height, and
the at least two electrode rolls which are stacked in the height direction on the basis of the plane are configured to have a structure of a first electrode roll and a second electrode roll, which are formed by winding one end of a single continuous assembly electrode sheet in a clockwise or counter clockwise direction and winding the other end of the single continuous assembly electrode sheet in a clockwise or counter clockwise direction, the single continuous assembly electrode sheet consisting of a single continuous positive electrode sheet, a single continuous negative electrode sheet, a first separation sheet disposed between the single continuous negative electrode sheet and the single continuous positive electrode sheet, and a second separation sheet facing the first separation sheet in a state in which the single continuous negative electrode sheet or the single continuous positive electrode sheet is disposed between the second separation sheet and the first separation sheet, are stacked, and
wherein a length of the first electrode roll measured in a direction perpendicular to the height direction based on the plane is different than a length of the second electrode roll measured in the direction perpendicular to the height direction based on the plane.

2. The battery cell according to claim 1 , wherein the at least two electrode rolls are each configured to have an elliptically wound structure in a vertical section in a direction in which electrode tabs protrude.

3. The battery cell according to claim 1 , wherein the at least two electrode rolls each have a rectangular planar shape.

4. The battery cell according to claim 1 , wherein, in the one or more stepped structures in which the at least two electrode rolls are stacked, an upper one of the at least two electrode rolls and a lower one of the at least two electrode rolls are different from each other in terms of at least one selected from among a thickness, a breadth (horizontal length), and a width (vertical length).

5. The battery cell according to claim 4 , wherein the at least two electrode rolls having different sizes are different from each other in terms of a planar size such that at least one of the breadth and width are different.

6. The battery cell according to claim 1 , wherein the at least two electrode rolls are stacked in a state in which one side of the at least two electrode rolls are aligned in a straight line.

7. The battery cell according to claim 6 , wherein electrode tabs are located at the aligned side of the at least two electrode rolls.

8. The battery cell according to claim 1 , wherein electrode tabs of the at least two electrode rolls are coupled to each other to form electrode terminals of the battery cell.

9. The battery cell according to claim 1 , wherein one of the first electrode roll and the second electrode roll is configured to have a structure in which the single continuous assembly electrode sheet is wound in the clockwise direction, and the other of the first electrode roll and the second electrode roll is configured to have a structure in which the single continuous assembly electrode sheet is wound in the counter clockwise direction.

10. The battery cell according to claim 1 , wherein the battery cell is a pouch-shaped battery cell configured to have a structure in which the at least two electrode rolls are received in a battery case, the at least two electrode rolls are impregnated with an electrolyte, the battery case is sealed by thermal welding, and a positive electrode terminal and a negative electrode terminal protrude outward from the battery case.

11. The battery cell according to claim 10 , wherein the battery case is made of a laminate sheet comprising a metal layer and a resin layer.

12. The battery cell according to claim 10 , wherein the battery case is provided with a receiving part having a stepped structure in width and height.

13. The battery cell according to claim 12 , wherein the stepped structure is formed at a region of the battery case at which the positive electrode terminal and the negative electrode terminal are not formed.

14. The battery cell according to claim 10 , wherein the battery case is provided with a first receiving part and a second receiving part for receiving a first electrode roll and a second electrode roll having different sizes, respectively.

15. The battery cell according to claim 14 , wherein the first receiving part and the second receiving part are different from each other in terms of at least one selected from among a thickness, a breadth (horizontal length), and a width (vertical length).

16. The battery cell according to claim 14 , wherein the first receiving part has a larger depth than the second receiving part.

17. The battery cell according to claim 14 , wherein the first receiving part has a larger planar area than the second receiving part.

18. The battery cell according to claim 14 , wherein one side of the first receiving part and one side of the second receiving part are adjacent to each other in a vertical direction.

19. The battery cell according to claim 18 , wherein the positive electrode terminal and the negative electrode terminal are located at one side of the first receiving part and one side of the second receiving part adjacent to each other.

20. The battery cell according to claim 14 , wherein the battery case comprises an upper case, at which the first receiving part is formed, and a lower case, at which the second receiving part is formed, and the at least two electrode rolls having different sizes are received in the first receiving part and the second receiving part.

21. The battery cell according to claim 1 , wherein the battery cell is a lithium ion battery cell or a lithium ion polymer battery cell.

22. A device comprising a battery cell according to claim 1 as a power source.

23. The device according to claim 22 , wherein the device is selected from a group consisting of a mobile phone, a portable computer, a smart phone, a tablet PC, a smart pad, a netbook computer, a light electronic vehicle (LEV), an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a power storage device.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Ki Tae
• Kim Dong Myung

Classifications

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M10/0431 Primary

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M10/0587 Primary

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• H01M2220/10

  Batteries in stationary systems, e.g. emergency power source in plant · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title