Battery cell and manufacturing method therefor, battery, and electric device

PL4447203T3Active Publication Date: 2026-06-29CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED
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Patent Information

Authority / Receiving Office
PL · PL
Patent Type
Patents
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED
Filing Date
2022-05-23
Publication Date
2026-06-29

AI Technical Summary

Technical Problem

Existing battery cells face issues with safety and performance due to micro-cracks in the welding interface between different metal materials, leading to electrolyte leakage and degradation over time.

Method used

A battery cell design that includes a conductive piece with a folded portion and a recess-protrusion fit structure, allowing for indirect molten welding using residual heat during the welding of the end cap and housing, eliminating the need for additional welding steps and reducing energy consumption, while forming a reliable conductive cross-section to prevent micro-cracks.

Benefits of technology

This design enhances the electrical conductivity and safety of the battery cell by reducing micro-cracks and electrolyte leakage, improving the overall performance and reliability of the battery cell during use.

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Abstract

A battery cell and a manufacturing method therefor, a battery, and an electric device. The battery cell comprises: a housing (1), an opening (11) being formed in an end portion of the housing (1); an electrode assembly provided in the housing (1) and comprising an electrode body (21) and a first tab (22), the first tab (22) being led out from one end of the electrode body (21); an end cap (3) closing the opening (11), the outer periphery of the end cap (3) and the housing (1) being fixed by welding; and a conductive member (4) located between the electrode assembly and the end cap (3), the conductive member (4) being electrically connected to the first tab (22), the conductive member (4) being electrically connected to at least one of the end cap (3) and the housing (1), and the outer edge of the conductive member (4) extending to a position close to a welding region. Residual heat generated by the welding of the end cap and the housing is used for indirectly melting and welding the conductive member, welding energy is reduced, the generation of micro-cracks can be reduced, electrolyte leakage is prevented, and the performance and safety of the battery cell are improved.
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