Battery protection structure, battery pack and electric vehicle

Abstract

The invention provides a battery protection structure, a battery pack and an electric vehicle. The battery protection structure is applied to the battery pack, and the battery pack comprises a plurality of batteries and a cooling assembly; the battery protection structure comprises a blocking part and a heat dissipation part, the blocking part is used for blocking heat generated when the battery runs, and when the temperature reaches a set temperature interval, the material of the blocking part is subjected to chemical reaction to increase the equivalent heat capacity of the blocking part; and the heat dissipation part is in heat conduction connection with the cooling assembly, the heat dissipation part has anisotropic thermal characteristics, the in-plane equivalent thermal conductivity of the heat dissipation part is larger than 200 W / mK, and the in-plane equivalent thermal conductivity is 10 times or more of the thickness-direction equivalent thermal conductivity. According to the battery protection structure provided by the invention, when the battery runs to generate heat, the heat dissipation part quickly transmits part of heat to the cooling assembly, and the barrier part can increase and absorb part of heat through equivalent heat capacity, so that the total heat insulation amount of the barrier part is reduced, the heat insulation performance of the barrier part is improved, and the safety of the power battery is improved.

Description

technical field [0001] The present application relates to the technical field of power battery thermal protection, in particular to a battery protection structure, a battery pack and an electric vehicle. Background technique [0002] With the vigorous development of electric vehicles, their safety has attracted widespread attention. As a core component, the thermal safety design of the power battery is particularly important. How to prevent its thermal runaway and thermal expansion is a difficult problem facing the industry. [0003] The main cause of power battery thermal runaway is the internal short circuit caused by mechanical abuse, electrical abuse and thermal abuse. When the thermal runaway of a single battery cell, if there are no good heat insulation and flame retardant measures, it may extend to the surrounding batteries and even the battery pack and the entire battery pack. car. At present, the heat insulation solution is mainly used to prevent thermal diffusion ...

AI Technical Summary

Problems solved by technology

At present, the heat insulation solution is mainly used to prevent thermal diffusion after the thermal runaway of a single battery cell, that is, to add heat insulation materials between the battery cells, between the battery cell and the battery pack cover, and the cab to increase the thermal runaway The temperature difference between the battery cell and the surrounding cells hinders thermal diffusion. However, only through heat insulation, its effect and reliability will be insufficient, and the cell next to the thermal runaway cell may also enter the thermal runaway startup temperature , and, when the temperature exceeds the withstand temperature of the insulation material, the insulation effect will be greatly attenuated

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