US 12,278,397 B2
Pouch type secondary battery and production method thereof
Hee Gyoung Kang, Daejeon (KR)
Assigned to SK On Co., Ltd., Seoul (KR)
Filed by SK On Co., Ltd., Seoul (KR)
Filed on Oct. 29, 2020, as Appl. No. 17/084,545.
Claims priority of application No. 10-2019-0137381 (KR), filed on Oct. 31, 2019.
Prior Publication US 2021/0135180 A1, May 6, 2021
Int. Cl. H01M 50/531 (2021.01); H01M 10/0585 (2010.01)
CPC H01M 50/531 (2021.01) [H01M 10/0585 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A pouch type secondary battery comprising:
a battery cell including a positive plate, a negative plate, a separator, and positive and negative electrode tabs that protrude; and
a pouch case having the battery cell disposed therein,
wherein the pouch case includes:
a battery cell accommodation space accommodating the battery cell;
a sealing portion formed by sealing the pouch case around an outer periphery of the battery cell accommodation space;
a tab welding surface formed in a portion where the positive electrode tab and the negative electrode tab are disposed inside the sealing portion and the pouch case is not sealed; and
a pouch inclined surface formed between the battery cell accommodation space and the tab welding surface,
wherein a wrinkle having a corrugated shape is formed on the tab welding surface, the wrinkle extending along a direction where the positive and negative electrode tabs protrude, and
wherein the tab welding surface is configured to form a gas collection space collecting and accommodating gas by spreading the wrinkle formed on the tab welding surface in a perpendicular direction where the positive and negative electrode tabs protrude when the gas is generated in the battery cell, and thereby configured to prevent or delay a venting phenomenon of the battery pouch.