Cap structure, battery cell and battery

CN224328773UActive Publication Date: 2026-06-05ZHEJIANG LISUN ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ZHEJIANG LISUN ENERGY TECHNOLOGY CO LTD
Filing Date
2025-05-13
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

During short-circuit testing, existing cylindrical cells generate high temperatures inside the core, causing the rubber ring to melt or detach, which in turn leads to contact between the casing and the cover plate, posing a safety risk of fire or explosion.

Method used

A cap structure was designed, including an outer and inner rubber ring, with a highly expandable material filling the middle to form a hollow filling area. When the outer and inner rubber rings melt or fall off at high temperatures, the expandable material can still cover the space between the cap plate and the steel shell, playing an isolation role and preventing contact.

Benefits of technology

It effectively suppresses the risk of fire or explosion caused by the melting or detachment of the rubber ring during short-circuit testing, improves the safety of the battery cell, and does not affect battery performance.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to battery technology field, specifically disclose a cap structure, including cover and rubber ring body, the rubber ring body is covered in the cover plate outer periphery, wherein, the rubber ring body includes rubber ring outer layer and rubber ring inner layer, rubber ring inner layer and the cover plate outer wall abut, rubber ring outer layer and rubber ring inner layer combine and form hollow filling area, the hollow filling area is filled with high expansion material, high expansion material is configured as can expand when being heated. The utility model discloses a battery cell and battery. The utility model is in the battery cell short circuit test, and the temperature of roll core inside rises, even if the melting or the falling phenomenon of rubber ring outer layer and rubber ring inner layer place, but due to the high expansion material of hollow filling area expansion when being heated still can cover between the cover and steel shell, and then effectively inhibit the battery cell and take place fire or explosion etc. safety risk.
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