US 12,463,274 B2
Battery cell, method and system for manufacturing same, battery, and electrical device
Kun Fang, Fujian (CN); Zhijun Guo, Fujian (CN); and Haizu Jin, Fujian (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed on Sep. 5, 2023, as Appl. No. 18/242,010.
Application 18/242,010 is a continuation of application No. PCT/CN2021/122115, filed on Sep. 30, 2021.
Prior Publication US 2023/0411746 A1, Dec. 21, 2023
Int. Cl. H01M 50/169 (2021.01); H01M 50/358 (2021.01)
CPC H01M 50/169 (2021.01) [H01M 50/358 (2021.01); H01M 2220/20 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A battery cell, comprising:
a housing having an opening;
an electrode assembly, accommodated in the housing;
an end cap, comprising a cap body and a protruding structure, wherein the cap body comprises a first plate body and a second plate body, the first plate body is disposed around the protruding structure and laser-welded to the housing so that the end cap fits and covers the opening, and the protruding structure is disposed around the second plate body; and
a current collecting structure to electrically connect a first tab of the electrode assembly and the end cap, wherein the current collecting structure comprises a first current collecting structure and a second current collecting structure connected to the first current collecting structure, the first current collecting structure is connected to the first tab so that the current collecting structure is electrically connected to the first tab; and the second current collecting structure surrounds the first current collecting structure, and the second current collecting structure is connected to at least one of the protruding structure or the second plate body so that the current collecting structure is electrically connected to the end cap, wherein
in a thickness direction of the end cap, the protruding structure protrudes from an inner surface of the cap body toward the electrode assembly, and is configured to block a laser beam during welding between the cap body and the housing;
a first recess is formed on the end cap at a position corresponding to the protruding structure, the first recess is recessed from an outer surface of the cap body toward the electrode assembly, and the first recess is configured to release a stress during welding between the cap body and the housing; and
in the thickness direction, a bottom face of the first recess is closer to the electrode assembly than the entire inner surface of the cap body.