Secondary battery and electronic device

By using a bimetallic shape memory alloy pressure relief component in a secondary battery, the pressure relief channel is opened when the temperature changes due to the difference in the coefficient of thermal expansion. This solves the risk of explosion of the secondary battery at high temperature or short circuit, and achieves timely pressure relief and seal restoration.

WO2026138197A1PCT designated stage Publication Date: 2026-07-02NINGDE AMPEREX TECHNOLOGY LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
NINGDE AMPEREX TECHNOLOGY LTD
Filing Date
2025-11-07
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Secondary batteries are prone to thermal runaway under high temperature conditions or when short-circuited, which increases internal pressure and leads to the risk of explosion.

Method used

The pressure relief component adopts a bimetallic shape memory alloy, which utilizes the difference in thermal expansion coefficients of the two metal layers to open the pressure relief channel in time when the temperature changes. It includes a first metal layer and a second metal layer. The thermal expansion coefficient of the second metal layer is greater than that of the first metal layer. When the temperature rises, the expansion of the second metal layer causes the first metal layer to bend and detach from the seal, thus releasing the internal pressure.

Benefits of technology

It enables timely pressure relief of secondary batteries under abnormal conditions, reduces the risk of explosion, and restores the sealed state after the temperature recovers, supporting the reuse of the pressure relief component.

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    Figure CN2025133381_02072026_PF_FP_ABST
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Abstract

The present application discloses a secondary battery and an electronic device. The secondary battery comprises a housing, the housing being provided with an accommodating cavity enclosed therein. The housing comprises a first wall portion, and the first wall portion comprises a first wall surface facing away from the accommodating cavity and a second wall surface facing the accommodating cavity. The first wall portion is provided with a first through-hole passing through the first wall surface and the second wall surface. The secondary battery further comprises a pressure relief assembly, the pressure relief assembly comprising a metal sheet and a sealing member. In a direction from the second wall surface to the first wall surface, the metal sheet comprises a first metal layer and a second metal layer that are stacked. The sealing member is bonded between the first metal layer and the first wall surface. The metal sheet covers the first through-hole. The first metal layer has a coefficient of thermal expansion G1, and the second metal layer has a coefficient of thermal expansion G2, where G2 > G1. This configuration facilitates prompt response to internal temperature changes of the secondary battery, and enables prompt pressure relief of the secondary battery, thereby reducing the risk of explosion of the secondary battery.
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