Battery thermal runaway protecting part and preparation method as well as die thereof

Abstract

The invention provides a battery thermal runaway protecting part and a preparation method as well as a die thereof. A battery is a single battery or a battery pack; the protecting part comprises a heat insulating unit; the heat insulating unit comprises a cuboid of which two ends are opened; channels parallel to the axis direction of the unit are arranged on opposite side walls in the cuboid; the heat insulating unit is provided with a temperature alarm for alarming when the heat insulating unit reaches threshold temperature; the wall of the heat insulating unit comprises an outer layer, a middle layer and an inner layer. The preparation method of the protecting part comprises the following steps: assembling the die; preparing a flame-retardant material and injecting the flame-retardant material into the die; cooling and demolding; carrying out press forming on a frame molded by casting and a flame-retardant board, wherein the die comprises a casing of which the upper end is opened and a battery model arranged on a casing base plate. The device sufficiently utilizes the flame-retardant and heat-insulating characteristics and the advantages of low density, light weight and the like of the flame-retardant material; by casting molding of the inner layer, the flame-retardant material appears in a specific shape and structure and the flame-retardant and heat-insulating characteristics of the flame-retardant material are sufficiently realized; in addition, the method is simple and feasible, and is convenient to realize.

Description

Technical field: [0001] The invention relates to a battery protection device and the preparation of the protection device, in particular to a battery thermal runaway protection part, a preparation method thereof and a mold. Background technique: [0002] Lithium-ion batteries, which are widely used, have fire accidents from time to time, triggering large-scale recalls of related products, bringing safety hazards to users, and causing major direct economic losses to enterprises and industries related to lithium-ion batteries. [0003] Under certain abuse conditions (such as overcharge, high temperature, short circuit, etc.), lithium-ion batteries are prone to thermal runaway. During this process, the internal and surface temperatures of the battery will suddenly rise to several hundred degrees, and the battery will release energy in the form of combustion or explosion. , and eventually the battery structure is destroyed and the electrical performance is lost. At this stage, ...

AI Technical Summary

Problems solved by technology

[0006] The flame retardant materials of the existing lithium-ion batteries are mostly coated on the positive and negative electrodes and separators inside the lithium-ion battery by coating. Although this method can partially slow down the ignition and combustion of lithium-ion batteries Or containment effect, but due to the arrangement in the limited space inside the battery, the shape and quality of the flame retardant material are affected. Generally, the thickness of the coating layer is only 0.5-10μm, resulting in unsatisfactory flame retardant effect. At the same time, due to the flame retardant The coating applied on the positive and negative plates or diaphragm of the battery will inevitably affect the capacity, power performance or other electrical properties of the battery itself

In addition, there is also a method of adding a flame reta

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