Electrode assembly and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10854924-B2
Application number	US-201716072401-A
Country	US
Kind code	B2
Filing date	Sep 4, 2017
Priority date	Oct 5, 2016
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

The electrode assembly includes an electrode stack in which a plurality of first electrodes spaced apart from each other are disposed between two separators and second electrodes attached to both outer surfaces of the electrode stack at alternate positions of a plurality of positions on which the first electrodes are disposed, wherein, in the electrode stack, an area between the first electrode and the adjacent first electrode is folded.

First claim

The invention claimed is:

1. An electrode assembly comprising:
an electrode stack in which a plurality of first electrodes are disposed between two separators, the plurality of first electrodes being spaced apart from each other in a length direction of the two separators; and
a plurality of pairs of second electrodes attached, each pair of second electrodes stacked overlying and laminated to a corresponding one of the first electrodes at opposite outer surfaces of the electrode stack at alternate positions of a plurality of positions on which the first electrodes are disposed, such that only every other one of the first electrodes is stacked with and laminated to one of the pairs of second electrodes, and each of the first electrodes is longer than each of the second electrodes in the length direction,
wherein, in the electrode stack, folding parts of each of the two separators located between each of the first electrodes and a respective one of the first electrodes that is immediately adjacent thereto are folded, such that when the electrode stack is in a folded position, opposite ends of all of the first electrodes extend beyond opposite ends of all of the second electrodes in the length direction.

2. The electrode assembly of claim 1 , wherein the separators, the first electrodes, and the second electrodes are bonded to each other by heat or a pressure.

3. The electrode assembly of claim 1 , wherein each of the first electrodes is a negative electrode, and each of the second electrodes is a positive electrode.

4. The electrode assembly of claim 1 , wherein each of the folding parts of each of the two separators and a respective one of the folding parts that is immediately adjacent thereto are folded in folding directions opposite to each other.

5. The electrode assembly of claim 4 , wherein the electrode stack is folded in a zigzag manner.

6. The electrode assembly of claim 4 , wherein the electrode stack is folded to have a width based on a size of each of the first electrodes.

7. The electrode assembly of claim 4 , wherein each of the second electrodes has a size corresponding to that of the respective one of the first electrodes that is disposed immediately adjacent thereto.

8. The electrode assembly of claim 1 , wherein the two separators extend to surround the outside of the folded electrode stack.

9. The electrode assembly of claim 8 , wherein the two separators are bonded to each other by heat or a pressure.

10. A method for manufacturing an electrode assembly, the method comprising:
a step of interposing a plurality of first electrodes between two separators so that the first electrodes are spaced apart from each other to form an electrode stack, the plurality of first electrodes being spaced apart from each other in a length direction of the two separators;
a step of stacking a plurality of pairs second electrodes on opposite outer surfaces of the electrode stack at alternate positions of a plurality of positions of the first electrodes, each pair of second electrodes stacked overlying a corresponding one of the first electrodes at the opposite outer surfaces of the electrode stack, such that only every other one of the first electrodes is stacked with one of the pairs of second electrodes, and each of the first electrodes is longer than each of the second electrodes in the length direction;
a step of laminating the separators, the first electrodes, and the second electrodes to each other by heat or a pressure; and
a step of folding the electrode stack at folding parts of each of the two separators located between each of the first electrodes and a respective one of the first electrodes that is immediately adjacent thereto, such that when the electrode stack is in a folded position, opposite ends of all of the first electrodes extend beyond opposite ends of all of the second electrodes in the length direction.

11. The method of claim 10 , wherein, in the step of folding the electrode stack, a folding part and an adjacent folding part, which are portions to be folded, are folded in directions opposite to each other.

12. The method of claim 11 , wherein, in the step of folding the electrode stack, the electrode stack is folded in a zigzag manner.

13. The method of claim 11 , wherein the electrode stack is folded to have a width based on a size of each of the first electrodes.

14. The method of claim 10 , further comprising a sealing step of surrounding the folded electrode stack by using extending portions of the two separators.

15. The method of claim 14 , wherein, in the sealing step, the two separators are bonded to each other by heat or a pressure.

16. The method of claim 14 , wherein, in the sealing step, the two separators are attached to the outside of the folded electrode stack by using a hot-press.

Assignees

• Lg Chemical Ltd

Inventors

• Pyo Jung Kwan
• Kim Sung Jong
• Koo Sang Hyun
• Kim Soo Ryoung
• Ku Cha Hun
• Hwang Sung Min

Classifications

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M50/46

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title

• H01M10/0468

  Compression means for stacks of electrodes and separators · CPC title

• H01M10/0481

  Compression means other than compression means for stacks of electrodes and separators · CPC title

• H01M10/0583 Primary

  of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators · CPC title