Cylindrical lithium ion battery cover and cylindrical lithium ion battery

By designing a cylindrical lithium-ion battery cap that includes cross-metal sheets and a flame-retardant layer, the problems of pressure leakage and flame retardancy in cylindrical lithium-ion batteries under abnormal operating conditions are solved, achieving improved safety and reduced costs.

CN224842031UActive Publication Date: 2026-10-09HONGLI NEW ENERGY (CHENGDU) CO LTD
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Patent Information

Application Number
CN202522150402.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-10-11
Publication Date
2026-10-09
Estimated Expiration
2035-10-11

AI Technical Summary

Technical Problem

Cylindrical lithium-ion batteries can experience a rapid increase in internal pressure under abnormal operating conditions, which can easily lead to fire or explosion. Existing technologies are insufficient for effectively relieving pressure and preventing flame retardancy.

Method used

Design a cylindrical lithium-ion battery cap, comprising an insulating seal, a metal pressure plate, a top cover, and an explosion-proof component. The explosion-proof component consists of cross-arranged metal sheets and a flame-retardant layer. Gas pressure causes the grooves to break, enter the flame-retardant chamber, and react with the flame-retardant layer, thus achieving pressure relief and flame retardancy.

Benefits of technology

It effectively reduces the probability of fire and explosion of cylindrical lithium-ion batteries, improves safety, and has a simple structure, thus reducing production costs.

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Abstract

The utility model relates to a battery field discloses a cylindrical lithium ion battery cap and cylindrical lithium ion battery, and the cylindrical lithium ion battery cap includes insulating seal, metal pressing piece, top cap and explosion -proof subassembly, and the explosion -proof subassembly sealed installation is in the second through groove, and the explosion -proof subassembly includes first metal sheet and second metal sheet, and the space between both forms the flame -retardant chamber, first metal sheet is equipped with first score, and the thickness of the part of first metal sheet in first score is less than the thickness of the part of first metal sheet except first score, second metal sheet is equipped with second score, and the thickness of the part of second metal sheet in second score is less than the thickness of the part of second metal sheet except second score, and second metal sheet is equipped with flame -retardant layer. The cap can realize pressure -relief and flame -retardant, can reduce cylindrical lithium ion battery fire explosion probability, effectively improve security, and the cylindrical lithium ion battery cap structure is relatively simple, can effectively reduce production cost, can improve product competitiveness.
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