Pouch film and secondary battery including the same

Patent metadata

Field	Value
Publication number	US-11404756-B2
Application number	US-201916702041-A
Country	US
Kind code	B2
Filing date	Dec 3, 2019
Priority date	Dec 5, 2018
Publication date	Aug 2, 2022
Grant date	Aug 2, 2022

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 includes:
a gas chamber passage extending from the housing section, communicating with the housing section, and configured to serve as a passage of the electrolyte flowing into the housing section and to discharge the gas from the housing section;
a deformation part, extending from the gas chamber passage in a direction in which the gas chamber passage extends, communicating with the gas chamber passage, and being spaced apart from the housing section; and
a gas chamber inlet extending from the deformation part, and communicating with the deformation part so that the electrolyte is injected through the gas chamber inlet into the electrode assembly,
wherein a cross section of the deformation part is in a combination of concave and convex shapes,
wherein the deformation part is formed to have an elongated shape traversing a direction in which the gas chamber inlet extends, and
wherein the deformation part is configured to maintain a shape of the gas chamber inlet.

2. The pouch film according to claim 1 , wherein the deformation part is formed by denting or expanding a portion of the gas chamber.

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

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

5. 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, wherein the gas chamber section includes a gas chamber passage extending from the housing section, communicating with the housing section, and configured to serve as a passage of the electrolyte flowing into the housing section and to discharge the gas from the housing section, and a gas chamber inlet extended from the gas chamber passage;
forming a deformation part by denting or expanding a portion of the gas chamber section in a predetermined shape;
housing the electrode assembly in the housing section;
injecting the electrolyte through the gas chamber inlet formed on one side of the gas chamber section;
discharging a gas generated by reaction between the electrolyte and the electrode assembly to the gas chamber section; and
removing the gas chamber section and sealing the housing section,
wherein the deformation part is formed to have an elongated shape traversing a direction in which the gas chamber inlet extends,
wherein a cross section of the deformation part is in a combination of concave and convex shapes, and
wherein the deformation part is configured to maintain a shape of the gas chamber inlet.

6. The method of manufacturing a secondary battery according to claim 5 , wherein a plurality of deformation parts are formed in the predetermined shape.

7. The method of manufacturing a secondary battery according to claim 6 , wherein the predetermined shape 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