Pouch film and secondary battery including the same

Patent metadata

Field	Value
Publication number	US-2020185695-A1
Application number	US-201916702041-A
Country	US
Kind code	A1
Filing date	Dec 3, 2019
Priority date	Dec 5, 2018
Publication date	Jun 11, 2020
Grant date	—

Abstract

Embodiments of the present invention provides a pouch film. In manufacturing a secondary battery, a gas may be generated when reacting an electrode assembly with an electrolyte. After the generated gas is discharged, the pouch film may be sealed. In this case, a deformation part may be formed in the gas chamber section which serves as a passage for discharging the gas, specifically, in the gas chamber passage, thus to prevent the electrolyte from flowing backward and maintain shapes of the gas chamber inlet during injecting the electrolyte.

First claim

What is claimed is:

1 . A pouch film comprising:
a housing section configured to provide a space in which an electrode assembly is housed; and a gas chamber section formed integrally with the housing section and configured to discharge a gas generated by reacting an electrolyte with the electrode assembly to an outside, wherein the gas chamber section comprises a gas chamber inlet formed on one side thereof so that the electrolyte is injected, and the gas chamber section includes a deformation part formed therein in a predetermined pattern to maintain shapes of the gas chamber inlet and a portion adjacent thereto.

2 . The pouch film according to claim 1 , wherein the gas chamber inlet is a part of the gas chamber section.

3 . The pouch film according to claim 1 , wherein the deformation part is formed in a concave or convex shape or is formed in a combination of the concave and convex shapes.

4 . The pouch film according to claim 1 , wherein the deformation part has at least one of straight line, curve, polygonal, dot and circular shapes.

5 . The pouch film according to claim 1 , wherein the deformation part controls a flow of the electrolyte.

6 . The pouch film according to claim 1 , wherein the deformation part is formed by insert molding.

7 . A method of manufacturing a secondary battery, comprising:
preparing a pouch film which comprises: a housing section configured to house an electrode assembly; and a gas chamber section formed integrally with the housing section and configured to discharge a gas generated by reacting an electrolyte with the electrode assembly to an outside, forming a deformation part in a predetermined pattern in the gas chamber section, housing the electrode assembly in the housing section, injecting the electrolyte through a gas chamber inlet formed on one side of the gas chamber section, discharging a gas generated by the reaction between the electrolyte and the electrode assembly to the gas chamber section side, and removing the gas chamber section and sealing the housing section.

8 . The method of manufacturing a secondary battery according to claim 7 , wherein a plurality of deformation parts are formed in the predetermined pattern.

9 . The method of manufacturing a secondary battery according to claim 8 , wherein the deformation part of the predetermined pattern has at least one of straight line, curve, polygonal, dot and circular shapes.

Assignees

• Sk Innovation Co Ltd

Inventors

• Kim Hyo Sang

Classifications

• H01M50/557

  Plate-shaped terminals · CPC title

• H01M50/627

  Filling ports · CPC title

• H01M50/105 Primary

  Pouches or flexible bags · CPC title

• H01M50/548

  on opposite sides of the cell · CPC title

• H01M50/119

  Metals · CPC title