US 12,438,219 B2
Battery cell including end cap with protruding structure connecting to tab, method and system for manufacturing same, battery, and electrical device
Kun Fang, Fujian (CN); and Zhijun Guo, 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 May 25, 2023, as Appl. No. 18/201,785.
Application 18/201,785 is a continuation of application No. PCT/CN2021/122105, filed on Sep. 30, 2021.
Prior Publication US 2023/0299395 A1, Sep. 21, 2023
Int. Cl. H01M 50/169 (2021.01); H01M 10/0525 (2010.01); H01M 50/107 (2021.01); H01M 50/152 (2021.01); H01M 50/538 (2021.01)
CPC H01M 50/169 (2021.01) [H01M 10/0525 (2013.01); H01M 50/107 (2021.01); H01M 50/152 (2021.01); H01M 50/538 (2021.01)] 14 Claims
OG exemplary drawing
 
1. A battery cell, comprising:
a housing having an opening;
an electrode assembly, accommodated in the housing; and
an end cap to fit and cover the opening, wherein the end cap comprises a cap body and a protruding structure around the cap body, the protruding structure protrudes from an inner surface of the cap body toward the electrode assembly, and at least a part of the protruding structure is located in the housing and fit with the housing, wherein
a recess is formed on the end cap at a position corresponding to the protruding structure, and the recess is recessed from an outer surface of the cap body toward the electrode assembly and releases a stress while the protruding portion extends into the housing,
the electrode assembly is provided with a first tab at one end facing the end cap,
a current collecting structure is provided between the protruding structure and the first tab,
the protruding structure is electrically connected to the first tab via the current collecting structure, and the protruding structure abuts against the current collecting structure in a thickness direction of the end cap,
the end cap further comprises an extension structure protruding beyond an outer peripheral face of the protruding structure and surrounding the protruding structure, and the extension structure is welded to a sidewall of the housing around the opening so that the housing and the end cap are connected into one piece,
the extension structure is welded to a first outer end face of the sidewall of the housing to form a weld structure, the first outer end face of the sidewall of the housing being an outermost end of the sidewall of the housing in the thickness direction of the end cap, and in the thickness direction of the end cap, the weld structure is closer to the electrode assembly than the outer surface of the cap body, and
in a direction pointing to the sidewall from the electrode assembly, an outer wall face of the sidewall extends beyond the weld structure.