Top cover assembly for power battery and power battery

By designing an annular step structure and laser welding fixation in the pole assembly area of ​​the power battery top cover assembly, the problems of insufficient strength of the copper-aluminum interface and adaptability of the pole height are solved, achieving strength improvement and cost control.

CN223390735UActive Publication Date: 2025-09-26DONGGUAN CHAM BATTERY TECH CO LTD
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Patent Information

Application Number
CN202422268895.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-14
Publication Date
2025-09-26
Estimated Expiration
2034-09-14

AI Technical Summary

Technical Problem

In the power battery top cover structure, the copper-aluminum interface of the composite pole is not strong enough, posing a risk of fracture. In addition, the top cover structure cannot adapt to the requirements of different pole heights, resulting in high manufacturing costs.

Method used

A top cover assembly is designed, including first and second annular steps in the pole assembly area. The pole is placed on the second annular step through a sealing ring. A fixing ring is crimped onto the first annular step and the pole and fixed by laser welding. In combination with an insulating ring, reliable assembly and insulation of the pole and the fixing ring are ensured.

Benefits of technology

It improves the bonding strength of the poles, avoids the risk of breakage, reduces manufacturing costs, and can adapt to the needs of poles of different heights to meet the diverse assembly requirements of power batteries.

✦ Generated by Eureka AI based on patent content.
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Abstract

The utility model discloses a top cover assembly for power battery and power battery, the top cover assembly comprises a top cover, a pole, a sealing ring and a fixing ring, a pole assembly area is formed on the top cover, the pole assembly area comprises a first annular step located on the outer side and a second annular step located on the inner side, the upper surface of the first annular step sinks relative to the upper surface of the top cover, the second annular step is lower than the first annular step, a pole mounting hole is formed in the inner side of the second annular step, a pole is mounted corresponding to the pole mounting hole, and the pole is arranged on the second annular step through a sealing ring; and the fixing ring is crimped on the first annular step and the pole and locks the compression ratio of the sealing ring. According to the utility model, the second annular steps with different heights are manufactured, so that the poles can be positioned at different heights and can also adapt to the poles with different heights, further, the requirements of different pole heights on the surface of the top cover of the power battery can be met, and the poles with different heights can be assembled on the top cover of the power battery.
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