Top cover assembly, battery cell and battery pack

CN121618117BActive Publication Date: 2026-10-16SVOLT ENERGY TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202512014649.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-12-29
Publication Date
2026-10-16
Estimated Expiration
2045-12-29

AI Technical Summary

Technical Problem

[0004]本发明提供一种顶盖组件、电芯及电池包，用以解决现有技术中顶盖组件仅通过极柱受力和导热散热，造成电芯的强度较低且散热不良的问题

Benefits of technology

[0015] The top cover assembly, battery cell, and battery pack provided by this invention form a boss by bending the top cover body in the area where the explosion-proof valve is located. This not only enhances the structural strength of the top cover assembly and improves the mechanical strength of the battery cell, achieving thermoelectric separation of the terminal and the explosion-proof valve, but also increases the surface area of ​​the top cover body, thereby increasing the heat dissipation area of ​​the top cover body and the bonding area with the thermally conductive layer, improving the heat dissipation efficiency of the battery cell and controlling its operating temperature. Furthermore, the explosion-proof valve includes a seat, an overlap, and a valve body. The valve body is recessed and installed at the bottom of the mounting base through the seat. The height of the overlap, the ratio of the valve body thickness to the overlap height, and the ratio of the distance between the valve body and the overlap height to the overlap height are further defined. This effectively protects the valve body from the heat-affected zone during overlap welding and the tensile force on the valve body during boss deformation, ensuring the reliability and stability of the explosion-proof valve and improving the safety performance of the battery cell.

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Abstract

This invention relates to the field of battery technology, and provides a top cover assembly, a battery cell, and a battery pack. The top cover assembly includes: a top cover body, a terminal post, and an explosion-proof valve; a first through hole and a second through hole are spaced apart along the length of the top cover body; in the area where the second through hole is located, the top cover body is bent to form a boss protruding to one side; the terminal post passes through the first through hole and is electrically connected to the electrode tab of the battery cell; the explosion-proof valve includes a seat, an overlap, and a valve body, the seat body is connected to the overlap, the second through hole is a countersunk hole, the overlap is circumferentially overlapped on the stepped surface of the countersunk hole around the second through hole, the seat body extends circumferentially around the inner wall of the second through hole, and a mounting hole is formed on the side of the seat body near the electrode tab, and the valve body is mounted in the mounting hole; the height of the overlap is T4, the thickness of the valve body is T5, and the distance between the valve body and the overlap is H3, satisfying: 0.5mm≤T4≤0.7mm, 0.45≤T5 / T4≤0.55, 2.1≤H3 / T4≤2.8. This invention ensures the reliability and stability of the explosion-proof valve and improves the safety performance of the battery cell.
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