US 12,244,040 B2
Secondary battery
Jong Jun Park, Yongin-si (KR); and Dae Kyu Kim, Yongin-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
Filed on Apr. 29, 2022, as Appl. No. 17/733,046.
Claims priority of application No. 10-2021-0058745 (KR), filed on May 6, 2021.
Prior Publication US 2022/0359962 A1, Nov. 10, 2022
Int. Cl. H01M 50/578 (2021.01); H01M 10/0587 (2010.01); H01M 50/107 (2021.01); H01M 50/30 (2021.01)
CPC H01M 50/578 (2021.01) [H01M 10/0587 (2013.01); H01M 50/107 (2021.01); H01M 50/30 (2021.01)] 10 Claims
OG exemplary drawing
 
1. A secondary battery comprising:
a cylindrical case;
an electrode assembly accommodated in the cylindrical case and wound in a cylindrical shape; and
a current interrupt device electrically connected to the electrode assembly and sealing the cylindrical case,
wherein the current interrupt device comprises a cap-down electrically connected to the electrode assembly, a safety vent electrically connected to the cap-down, and an insulating gasket between the cap-down and the safety vent and covering outer circumferences of the cap-down and the safety vent, wherein the safety vent comprises: a first flat portion; a second flat portion which is bent upward from the first flat portion and extends; a third flat portion which is bent upward from the second flat portion and extends; and a fourth flat portion which is bent 180 degrees from the third flat portion and extends, the first to fourth flat portions extend parallel to one another, and a lower surface of the fourth flat portion directly contacts an upper surface of the third flat portion.