Power battery protection system and electric vehicle

Abstract

The invention provides a power battery protection system and an electric automobile, and relates to the technical field of electric automobiles, the power battery protection system comprises a heat exchange assembly arranged in a power battery; the heat exchange source is connected with the heat exchange assembly through a pipeline; the spraying assembly is arranged above a to-be-cooled element of the power battery; the reversing valve is arranged on a pipeline through which the heat exchange source is connected to the heat exchange assembly, and is connected with the spraying assembly through a pipeline; wherein the reversing valve has a first state and a second state; in the first state, the heat exchange source communicates with the heat exchange assembly and outputs a heat exchange medium to the heat exchange assembly. And in the second state, the spraying assembly communicates with the heat exchange assembly and the heat exchange source, and the heat exchange source and the heat exchange assembly can output cooling liquid to the spraying assembly. According to the scheme, the space is saved, the weight is light, the cooling liquid is used for cooling the power battery, the cost is reduced, the thermal runaway protection performance of the power battery is optimized, and the safety of an electric automobile and personnel is ensured.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, in particular to a power battery protection system and an electric vehicle. Background technique [0002] At present, in order to improve the energy density of the battery, the power batteries of electric vehicles mostly use cells with high energy density, but the probability of occurrence of thermal runaway and the severity of failure of such cells are relatively high. The existing power battery protection system generally uses the addition of cooling materials to suppress the spread of thermal runaway of the power battery cells, but this requires a lot of space, heavy weight, and the cost of cooling materials is relatively high. Therefore, a power battery protection system is needed to suppress the thermal runaway of the cell and prevent the injury of electric vehicles and personnel. SUMMARY OF THE INVENTION [0003] The purpose of the embodiments of the present invention is to pro...

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Problems solved by technology

[0002] At present, in order to increase the energy density of the battery, the power battery of electric vehicles mostly uses cells with high energy density, but the occurrence probability of thermal runaway and the severity of failure of such cells are relatively high.

The existing power battery protection system generally uses cooling materials to suppress the spread of thermal runaway of power battery cells, but this requires a large space, heavy weight, and the cost of cooling materials is relatively high

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