	US 12,206,120 B2
	Battery case for secondary battery and method for manufacturing pouch type secondary battery
Soo Ji Hwang, Daejeon (KR); Yong Su Choi, Daejeon (KR); Sang Hun Kim, Daejeon (KR); Hyung Kyun Yu, Daejeon (KR); and Na Yoon Kim, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 17/627,940
Filed by LG Energy Solution, Ltd., Seoul (KR)
PCT Filed Aug. 25, 2020, PCT No. PCT/KR2020/011319 § 371(c)(1), (2) Date Jan. 18, 2022, PCT Pub. No. WO2021/040380, PCT Pub. Date Mar. 4, 2021.
Claims priority of application No. 10-2019-0105419 (KR), filed on Aug. 27, 2019.
Prior Publication US 2022/0263166 A1, Aug. 18, 2022
Int. Cl. H01M 50/317 (2021.01); H01M 10/058 (2010.01); H01M 50/105 (2021.01); H01M 50/126 (2021.01)

CPC H01M 50/126 (2021.01) [H01M 10/058 (2013.01); H01M 50/105 (2021.01); H01M 50/317 (2021.01)]

16 Claims

1. A battery case for a secondary battery, comprising:

a cup part having an accommodation space configured to accommodate an electrode assembly, the electrode assembly including electrodes and separators;

a sealing part extending to the outside of the cup part; and

a gas discharge part which is attached to a hole, the hole formed through at least one of the cup part or the sealing part, the hole configured to allow a gas to pass therethrough,

wherein the gas discharge part comprises:

a melted layer comprising a heat melted thermoplastic resin; and

a thermosetting layer laminated on one surface of the melted layer and comprising a thermosetting resin, wherein the sealing part comprises: an inner area adjacent to the cup part; and an outer area disposed outside the inner area to provide an edge of the sealing part, the outer area configured to form a seal to seal the cup part, wherein the hole is formed in the inner area of the sealing part.

12. A method for manufacturing a pouch type secondary battery, the method comprising:

drawing a pouch film to form a cup part;

punching a hole in at least one of the cup part or a sealing part extending to the outside of the cup part;

attaching a gas discharge part to the hole, the gas discharge part configured to allow a gas to pass therethrough;

placing an electrode assembly in an accommodation space provided in the cup part, the electrode assembly including electrodes and separators; and

thermally pressing the sealing part,

wherein the gas discharge part includes

a melted layer of a heat melted thermoplastic resin and

a thermosetting layer laminated on one surface of the melted layer, the thermosetting layer including a thermosetting resin that is not melted by heat, wherein the sealing part comprises: an inner area adjacent to the cup part; and an outer area disposed outside the inner area to provide an edge of the sealing part, the outer area configured to form a seal to seal the cup part, wherein the hole is formed in the inner area of the sealing part.

13. The method of claim 12, wherein the gas discharge part is manufactured by:

preparing a film of the melted layer and a film of the thermosetting layer by using the thermoplastic resin and the thermosetting resin, respectively;

applying an adhesive between the film of the melted layer and the film of the thermosetting layer so that the film of the melted layer and the film of the thermosetting layer adhere to each other; and

drying and curing the adhesive.