Secondary battery, method for manufacturing the same, and electric device

By introducing an elastic layer with a compression ratio of 50%-90% into the secondary battery separator, the problem of separator puncture caused by expansion is solved, thereby improving the battery's cycle performance and lifespan.

CN122418052APending Publication Date: 2026-07-17CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date
2025-01-17
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

During charge-discharge cycles, the expansion of secondary batteries can cause the separator to be squeezed or punctured, reducing cycle life.

Method used

An elastic layer with a compression rate of 50%-90% is introduced into the separator to buffer battery expansion, maintain the separation of positive and negative electrodes, and improve the elasticity and flexibility of the separator.

Benefits of technology

This reduces the risk of the separator being punctured, maintains the stability of the battery's internal structure, improves electrode reaction efficiency, and extends the cycle life of the secondary battery.

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Abstract

本申请提供了一种二次电池及其制备方法、用电装置，属于电池技术领域。其中，二次电池包括正极极片、负极极片以及设置在正极极片和负极极片之间的隔离膜，隔离膜包括第一基膜、第二基膜以及设置在第一基膜和第二基膜之间的弹性层，在1MPa保压30s的条件下，所述弹性层的压缩率为50％‑90％。本申请隔离膜的弹性层能够被压缩以提供膨胀空间，减少了隔离膜被刺穿以及二次电池整体发生膨胀的问题，有助于改善二次电池的循环性能。
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