Battery electrode assembly, cover plate assembly and battery

Abstract

The invention provides a battery electrode assembly, a cover plate assembly and a battery. A temperature memory elastic element is arranged between an electrode terminal and a conducting strip and canelastically extend and act on the conducting strip so as to break electrical connection between the electrode terminal and a cap when the internal temperature of a battery is higher than a preset temperature control threshold value. When abnormal conditions such as collision, extrusion, overcharging and internal short circuit occur inside the battery, the internal temperature of the battery rises, and when the temperature reaches 60 to 80 DEG C, the temperature memory elastic member deforms and is elongated and thus pushes the conducting strip to break the connection between the electrode terminal and the conducting strip, thereby realizing the disconnection of an internal circuit of the battery. The trigger condition for battery protection via the battery electrode assembly is temperature instead of pressure, and the tensile force of the conducting strip is improved via the temperature memory elastic member; and on the premise of protection of the battery, the thickness of the conducting strip is ensured, the overcurrent capability of the battery is improved, and the performance of the battery is optimized.

Description

technical field [0001] The invention relates to the field of battery safety protection, in particular to a battery electrode assembly, a cover plate assembly and a battery. Background technique [0002] At present, most batteries have no safety protection structure on their cover plates, and the cover plates are only used as supporting poles. When the battery is subjected to abuse conditions such as impact, foreign object puncture or overheating, a series of complex electrochemical reactions will occur inside the battery. When these abnormalities are not effectively controlled and thermal runaway occurs in the battery, the battery may catch fire or even explode. In the prior art, by setting electrode terminals, adapters, reversing pieces, support members, and inner lead-out pieces inside the battery, the electrode terminals are electrically connected to the adapter, the adapter is electrically connected to the reversing piece, and the reversing piece is connected to the rev...

AI Technical Summary

Problems solved by technology

In the prior art, by setting electrode terminals, adapters, reversing pieces, support members, and inner lead-out pieces inside the battery, the electrode terminals are electrically connected to the adapter, the adapter is electrically connected to the reversing piece, and the reversing piece is connected to the reversing piece. The supports are welded and connected. When the battery is abnormal, the internal air pressure increases, the flip piece is turned over, the notch of the support is broken, and an open circuit is formed between the electrode terminal and the inner lead piece. However, the internal air pressure is limited when the battery is abnormal. , the pull-off ability of the reversing sheet is limited after being turned over, and the thickness of the weak part of the scoring sheet is required to be relatively weak, resulting in limited battery over-current capacity and poor battery over-current capacity

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