US 11,670,824 B2
Secondary battery
Dae Sik Oh, Yongin-si (KR); Jun Hyoung Park, Yongin-si (KR); and Yong Seok Oh, Yongin-si (KR)
Assigned to Samsung SDI Co., Ltd., Yongin-si (KR)
Filed by Samsung SDI Co., Ltd., Yongin-si (KR)
Filed on Jan. 22, 2020, as Appl. No. 16/749,301.
Claims priority of application No. 10-2019-0063249 (KR), filed on May 29, 2019.
Prior Publication US 2020/0381681 A1, Dec. 3, 2020
Int. Cl. H01M 50/169 (2021.01); H01M 50/166 (2021.01); H01M 50/529 (2021.01); H01M 50/10 (2021.01); B23K 9/02 (2006.01)
CPC H01M 50/169 (2021.01) [H01M 50/10 (2021.01); H01M 50/166 (2021.01); H01M 50/529 (2021.01); B23K 9/0216 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A secondary battery comprising:
an electrode assembly;
a case configured to accommodate the electrode assembly, the case comprising a bottom portion, long side portions, and short side portions, at least one of which comprises a welding portion and is bent and welded; and
a cap plate coupled to the case,
wherein each of the short side portions is configured by combining a first short side portion bent and extended from the bottom portion and second and third short side portions extending from a respective one of the long side portions,
wherein the welding portion comprises main welding portions and auxiliary welding portions overlapped with portions of the main welding portions, and the auxiliary welding portions are respectively located at a first corner of the case, where the first short side portion and the second short side portion meet, and at a second corner of the case, where the first short side portion and the third short side portion meet, and
wherein each of the auxiliary welding portions comprises welding lines overlapping the corresponding main welding portion in a plan view and crossing an extension direction of the corresponding main welding portion.