Internal short circuit triggering element, internal short circuit triggering battery and internal short circuit triggering method

Abstract

The invention provides an internal short-circuit triggering element, an internal short-circuit triggering battery and an internal short-circuit triggering method. The internal short-circuit triggeringelement is characterized in that metal powder is isolated in a battery through a phase-change material before the element is not activated, so that the internal short circuit of the battery will notbe triggered; after the element is activated, the internal short circuit of the battery can be triggered through circulation, and the method is a good method for simulating the self-initiated internalshort circuit of the battery. The phase-change material does not react with the internal material of the battery, especially an electrolyte, and does not react under the action of voltage, so that the phase-change material can stably exist in the battery for a long time. The internal short-circuit trigger element occupies a small space, has small influence on normal charging and discharging and circulation of the battery, and is flexible in arrangement position. According to the internal short-circuit triggering method provided by the invention, the internal short-circuit triggering of the battery in a full life cycle can be realized, the thermoelectric characteristics of the battery can be acquired, and the internal short-circuit safety after aging of the battery can be evaluated.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an internal short circuit trigger element, an internal short circuit trigger battery and an internal short circuit trigger method. Background technique [0002] The internal short circuit is the key problem of lithium-ion batteries, and its causes are more complex, including: the burr of the internal collector of the battery pierces the diaphragm, causing an internal short circuit; the collision and extrusion of the battery causes the rupture of the diaphragm, resulting in an internal short circuit; the internal impurity particles form a dendrite Puncture the diaphragm and cause internal short circuit; fast charging or low temperature charging will cause lithium precipitation in the battery to pierce the diaphragm and cause internal short circuit, etc. [0003] Self-initiated internal short circuit refers to the short circuit caused by the natural growth inside the ...

AI Technical Summary

Problems solved by technology

The existing technical scheme has a large transformation of the battery structure, which is fundamentally different from the internal short circuit that occurs during actual use, and cannot truly simulate the internal short circuit state of the battery; at the same time, the battery cannot be cycled for a long time, so it is not suitable for the internal short circuit of the entire life cycle. Short circuit safety evaluation

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