Top cover assembly, single battery cell and battery pack

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By creating a fracture zone on the plastic part and a pressure relief port on the cover, the problems of poor corrosion resistance and unstable opening force of the existing battery explosion-proof valve structure are solved, achieving a stable explosion-proof valve opening force and battery safety.

CN223911738UActive Publication Date: 2026-02-13EVE POWER CO LTD +1

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Patent Information

Application Number: CN202423319860.X
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-12-31
Publication Date: 2026-02-13
Estimated Expiration: 2034-12-31

Application Information

Patent Timeline

31 Dec 2024

Application

CN202423319860.X

13 Feb 2026

Publication

CN223911738U

IPC: H01M50/152; H01M50/317; H01M50/145; H01M50/186; H01M50/107

CPC: Y02E60/10

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Application Domain

Small-sized cells cases/jackets Cell sealing materials

Technology Topics

Electrical battery Structural engineering

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AI Technical Summary

Technical Problem

The existing stamping or welding forming methods of battery explosion-proof valves result in poor corrosion resistance and unstable opening force, and have low welding applicability.

Method used

A fracture zone is formed on the plastic part, and a pressure relief port is formed on the cover plate. The two are used together to form an explosion-proof valve structure. Injection molding is used to control the thickness of the fracture zone to stabilize the opening force.

Benefits of technology

An explosion-proof valve structure that requires no stamping or welding has been achieved, ensuring the stability of the explosion-proof valve's opening force and the safety of the battery.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of batteries, and provides a top cover assembly, a single battery cell and a battery pack. The top cover assembly comprises a plastic part and a cover plate. A pressure relief opening is formed in the cover plate. The plastic part is connected with the side, close to the electrode assembly, of the cover plate. The plastic part has a fracture area. The fracture area is arranged close to the pressure relief opening. And the fracture area is configured to be fractured under the action of air pressure in the battery cell. Therefore, the anti-explosion valve structure can be formed on the top cover assembly without a stamping or welding mode, and the stability of the opening force of the anti-explosion valve can be ensured.

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