Pressing jig with a gradient hardness pressing pad for a battery cell and a degassing method of battery cell using the same

Patent metadata

Field	Value
Publication number	US-12500260-B2
Application number	US-202117793336-A
Country	US
Kind code	B2
Filing date	Sep 29, 2021
Priority date	Oct 23, 2020
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

A pressing jig of a battery cell including a pressing pad, in which the modulus of the central region is different from the modulus of the peripheral region, and a method of degassing a battery cell using the same are provided. The pressing pad can easily discharge gas in the battery cell during the formation process of a battery cell by allowing higher pressure to be applied to the central region than the peripheral region.

First claim

The invention claimed is:

1 . A pressing jig of a battery cell, the pressing jig comprising:
first and second plates configured to press opposite surfaces of a battery cell disposed therebetween and a pressing pad provided at at least one of a surface of the first plate or a surface of the second plate facing the battery cell, wherein the pressing pad includes n regions located on a same plane, wherein the n regions satisfy a following condition 1:
M1>M2,  [Condition 1]

where M 1 and M 2 denote a modulus of elasticity of a central region and a peripheral region in the n regions, respectively, wherein the central region and the peripheral region have a same thickness while being spaced apart from the battery cell or the central region and the peripheral region are different materials.

2 . The pressing jig of claim 1 , wherein the first and second plates each have the pressing pad.

3 . The pressing jig of claim 1 , wherein the pressing pad satisfies a following condition 2:
R1>R2,  [Condition 2]
where R 1 and R 2 denote a hardness of a central region and a peripheral region in the n regions, respectively.

4 . The pressing jig of claim 1 , wherein the pressing pad has a structure in which the modulus of elasticity gradually decreases from the central region to the peripheral region.

5 . The pressing jig of claim 1 , wherein, in the pressing pad, the n regions are arranged to have an orientation parallel to each other.

6 . The pressing jig of claim 1 , wherein, in the n regions, the peripheral regions are arranged radially with respect to the central region.

7 . The pressing jig of claim 1 , wherein the central region includes at least one selected from the group consisting of silicone, plastic and foam.

8 . The pressing jig of claim 1 , wherein the peripheral region includes at least one selected from the group consisting of plastic and foam.

9 . The pressing jig of claim 1 , wherein each of the first and second plates has a heating member.

10 . A method of degassing a battery cell, the method comprising degassing a battery cell by pressing the opposite surfaces of the battery cell using the pressing jig of claim 1 during a formation process of the battery cell.

11 . The method of claim 9 , wherein the degassing includes applying heat to the first and second plates.

Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Sun Kyu
• Choy Sang Hoon

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/52

  Removing gases inside the secondary cell, e.g. by absorption (vent plugs or other mechanical arrangements for facilitating escape of gases H01M50/30) · CPC title

• H01M10/446

  Initial charging measures · CPC title

• H01M10/049

  Processes for forming or storing electrodes in the battery container · CPC title

• Y02P70/50

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