Cap assembly and cylindrical battery

By optimizing the structural parameters of the cap assembly, the problems of insufficient sealing and overcurrent capacity of cylindrical batteries were solved, improving battery safety performance and production efficiency, and reducing production costs.

CN224472551UActive Publication Date: 2026-07-07JIANGSU RELIANCE ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
JIANGSU RELIANCE ENERGY TECHNOLOGY CO LTD
Filing Date
2025-03-20
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

The existing cylindrical battery cap assembly has an unreasonable design, resulting in insufficient sealing and current carrying capacity, and there is a risk of leakage or a reduction in welding area.

Method used

Design a cap assembly including an explosion-proof plate and a top cover plate. The ratio of the length of the welded protrusion to the length of the top cover plate is 12%–20%, the ratio of the length of the explosion-proof groove to the length of the explosion-proof plate is 20%–30%, the ratio of the length of the welded protrusion end to the length of the explosion-proof groove is 55%–75%, the ratio of the length of the support part to the length of the top cover plate is 1%–4%, the angle between the support part and the horizontal plane is 90°–140°, the ratio of the length of the inclined platform to the length of the boss is 58%–70%, and the ratio of the length of the boss to the length from the explosion-proof groove to the central axis of the explosion-proof plate is 12%–22%, in order to optimize the structural parameters of the cap assembly.

Benefits of technology

It improves the sealing performance, overcurrent capacity, safety performance and production efficiency of cylindrical batteries, while reducing production costs and welding defect rate.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224472551U_ABST
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Abstract

The utility model relates to a kind of cap assembly and cylindrical battery.It is related to new energy battery technical field.The present application specifically includes explosion-proof sheet and top cover plate, top cover plate is located at the top of explosion-proof sheet, and the top of top cover plate is equipped with the welding protrusion extending upwards, and pressure relief zone is formed between explosion-proof sheet and welding protrusion;In horizontal direction, the length L1 of the end of welding protrusion to the edge of top cover plate, and the ratio L1 / L0 of the overall length L0 of top cover plate is 12%~20%.The length L1 of the end of welding protrusion to the edge of top cover plate of the utility model, and the L1 / L0 ratio of the overall length L0 of top cover plate is 12%~20%, can prevent the interference of the sealing edge of battery shell and welding protrusion on top cover plate, guarantee the sealing of cylindrical battery, can also guarantee the effective welding area of welding protrusion, guarantee the overcurrent capacity of cylindrical battery, to improve the performance of cylindrical battery.
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