Safety protection sleeve for lithium ion power battery

Abstract

A safety protection sleeve for lithium ion power battery is prepared from modified composite plastic containing nano clay. The nano clay is prepared by the following steps: purchasing purified primary montmorillonite, mixing the primary montmorillonite with organic cations or acid, heating so as to obtain activated montmorillonite, wherein the acid is at least one of hydrochloric acid, nitric acid, and sulfuric acid, and the concentration of the acid is 1 to 10 mol / L. The nano clay is prepared by the following specific steps: mixing acid with primary montmorillonite, wherein 1 gram of primary montmorillonite is mixed by 3 to 10 mL of acid; heating until the acid is boiling, keeping boiling for at least 1.5 hours, washing the primary montmorillonite by water until the primary montmorillonite turns neutral so as to obtain activated montmorillonite; washing the activated montmorillonite by deionized water, then filtering, burning montmorillonite at a temperature of 200 DEG C for at least two hours so as to dry the montmorillonite, grinding, and finally sieving with a 60-mesh sieve so as to obtain the finished montmorillonite product namely nano clay. The protection sleeve has the heat-dissipating and insulation functions, is prepared by compounding plastic and inorganic materials, and is capable of rapidly and high efficiently absorbing flammable and explosive electrolyte so as to guarantee the safety.

Description

technical field [0001] The invention relates to a lithium battery, in particular to a protection device for a lithium ion power battery. Background technique [0002] Lithium-ion power batteries have been rapidly developed in the field of power applications due to their advantages of long life and high energy density. However, it cannot be ignored that although the lithium-ion power battery has a good management of the overcharge and discharge, thermal management and short circuit of the battery through the advanced battery management system. However, power batteries are almost all high-voltage and high-capacity batteries, and their batteries must be used in a "multi-parallel and multi-series" mode. Sometimes thousands of batteries need to be assembled together, so the safety factor is low. In addition, the main raw material of the lithium-ion power battery cell - electrolyte, is usually a flammable and explosive organic carbonate material. The electrolyte of the battery d...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the safety performance of the existing lithium-ion power battery is not high, the present invention provides a safety protective cover for the lithium battery. Absorb flammable and explosive electrolyte to achieve the purpose of safety protection

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