Battery cell, battery and electric device

CN122459948APending Publication Date: 2026-07-24CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date
2024-08-20
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In the prior art, the bare battery cell generates gas during cyclic expansion and charge-discharge process, which causes cracks at the connection between the outer shell and the top cover, resulting in failure of the connection structure.

Method used

A connecting side wall is set at the connection between the top cover and the shell to form a groove. The wall thickness of the connecting side wall is not greater than the thickness of the shell and the connection to increase the contact area and deformation capacity, form a force buffer zone, and reduce the force on the connecting structure.

Benefits of technology

The structural strength and shear resistance of the connection between the top cover and the shell are improved, the risk of cracking of the connection structure is reduced, and the service life of the battery cell is extended.

✦ Generated by Eureka AI based on patent content.

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Abstract

A battery cell (10), a battery (100), and an electrical device are disclosed. The battery cell (10) includes a housing (11), a top cover (12), and an electrode assembly. The housing (11) has a receiving space (11a) and an opening (11b). The top cover (12) is provided as a sealing cover at the opening (11b). The electrode assembly is disposed within the receiving space (11a). The top cover (12) includes a cover body (121) and a connecting sidewall (122). One end of the connecting sidewall (122) is connected to the side of the cover body (121) facing the electrode assembly, and the other end extends away from the cover body (121). The outer shell (11) is connected to the outer sidewall of the connecting sidewall (122). At least a portion of the connecting sidewall (122) between the cover body (121) and the outer shell (11) is recessed to form a groove (122a). The wall thickness of the connecting sidewall (122) at the groove (122a) is not greater than the thickness at the connection between the outer shell (11) and the connecting sidewall (122). This structure reduces the risk of cracking in the connection structure between the outer shell (11) and the top cover (12), solves the problem of connection structure failure between the outer shell (11) and the top cover (12), and improves the service life of the battery cell (10).
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