Electrode assembly and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-11038242-B2
Application number	US-201916678462-A
Country	US
Kind code	B2
Filing date	Nov 8, 2019
Priority date	Jul 10, 2015
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

The present invention relates to an electrode assembly. The electrode assembly comprises: a first separator sheet; and first and second electrode sheets respectively adhering to both sides of the first separator sheet, wherein both the surfaces of the first separator sheet have adhesion different from each other, the first electrode sheet adheres to a first surface, which has relatively high adhesion, of both the surfaces, and the second electrode sheet adheres to a second surface, which has relatively low adhesion, of both the surfaces.

First claim

The invention claimed is:

1. A method for an electrode assembly comprising:
a step (S 10 ) of manufacturing a first separator sheet so that both surfaces of the first separator sheet have adhesion per unit area different from each other;
a step (S 20 ) of disposing a first electrode sheet on a first surface, which has relatively high adhesion per unit area, of both the surfaces of the first separator sheet and a second electrode sheet on a second surface, which has relatively low adhesion per unit area, of both the surfaces of the first separator sheet; and
a step (S 30 ) of applying heat and a pressure to allow the first and second electrode sheets to adhere to both the surfaces of the first separator sheet and thereby to manufacture a radical unit.

2. The method of claim 1 , wherein, in the step (S 10 ), both the surfaces of the first separator sheet are plasma-treated to be activated in adhesion, and the second surface is relatively weakly plasma-treated compared to the first surface.

3. The method of claim 1 , wherein, in the step (S 10 ), only the first surface is selectively plasma-treated.

4. The method of claim 1 , wherein, in the step (S 10 ), a binder coating layer is formed on each of both the surfaces of the first separator sheet, and the binder coating layer having a thickness thinner than that of the binder coating layer formed on the first surface is formed on the second surface.

5. The method of claim 1 , after the step (S 30 ), further comprising a step (S 40 ) of applying heat and a pressure to allow a second separator sheet to adhere to the second electrode sheet of the radical unit and winding the radical unit to manufacture the electrode assembly.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Sang Kyun
• Ku Cha Hun
• Kim Sang Hun
• Kim Tae Kyu
• Choi Min Cheol

Classifications

• Y02P70/50

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

• H01M2220/30

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

• H01M50/461 Primary

  with adhesive layers between electrodes and separators · CPC title

• H01M10/0431 Primary

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

• H01M50/403

  Manufacturing processes of separators, membranes or diaphragms · CPC title