US 12,080,912 B2
Battery case for secondary battery and method for manufacturing pouch type secondary battery
Soo Ji Hwang, Daejeon (KR); Sang Hun Kim, Daejeon (KR); and Yong Su Choi, Daejeon (KR)
Assigned to LG Energy Solution, Ltd., Seoul (KR)
Appl. No. 17/626,895
Filed by LG Energy Solution, Ltd., Seoul (KR)
PCT Filed Aug. 25, 2020, PCT No. PCT/KR2020/011312
§ 371(c)(1), (2) Date Jan. 13, 2022,
PCT Pub. No. WO2021/040377, PCT Pub. Date Mar. 4, 2021.
Claims priority of application No. 10-2019-0105418 (KR), filed on Aug. 27, 2019.
Prior Publication US 2022/0255186 A1, Aug. 11, 2022
Int. Cl. H01M 50/30 (2021.01); H01M 50/105 (2021.01); H01M 50/124 (2021.01); H01M 50/186 (2021.01)
CPC H01M 50/394 (2021.01) [H01M 50/105 (2021.01); H01M 50/1243 (2021.01); H01M 50/186 (2021.01)] 13 Claims
OG exemplary drawing
 
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;
a gas discharge part attached to a hole, the hole formed through at least one of the cup part or the sealing part, the hole extending from a first end at an inside of the battery case to a second end at an outside of the battery case and configured to allow a gas to pass therethrough, the gas discharge part being attached to the first end of the hole and extending into the battery case; and
a coating part applied to an inner circumferential surface of the hole and having electrolyte resistance,
wherein the gas discharge part comprises:
a gas discharge layer configured to allow the gas to pass therethrough; and
an outer functional layer formed on an outer surface of the gas discharge layer, the outer functional layer being hydrophobic and extending across the hole, the gas discharge layer extending continuously across the outer functional layer from a first end of the outer functional layer to a second end of the outer functional layer.