A battery thermal management system and an electric vehicle

Abstract

The invention relates to a battery thermal management system, comprising a lithium battery pack, used to provide high-voltage current input for vehicles in a normal temperature environment; a storage battery pack, connected in parallel with the lithium battery pack, used to provide high-voltage current for vehicles in a low-temperature environment Input; a battery management module, used to select a battery pack for power supply according to the temperature of the lithium battery pack, and when the temperature of the lithium battery pack is lower than a preset temperature threshold, control the battery pack to be a refrigerant subsystem and a coolant Subsystem power supply; refrigerant subsystem, including compressor and heat exchange device, the compressor and heat exchange device are connected through pipelines to form a loop; coolant subsystem, the coolant of the coolant subsystem circulates through the exchange The heating device and the lithium battery pack are used for preheating the lithium battery pack. The implementation of the present invention can reduce the impact of starting the power battery on its power and life in a low temperature environment.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a battery thermal management system. Background technique [0002] New energy vehicles are new types of transportation that are currently being fully developed, including hybrid electric vehicles, pure electric vehicles, and fuel cell electric vehicles. One of the factors, and the ambient temperature of the battery has a particularly prominent impact on battery life and power. [0003] In order to reduce the impact of the ambient temperature on the battery, when using the vehicle in winter, the PTC method is generally used to heat the battery to a certain temperature, but this heating method has two obvious disadvantages. One is that PTC heating needs to consume more batteries. The second is that in the initial stage, the battery temperature is low. At this time, the battery discharge has a great impact on the life of the battery itself and the loss of power. Therefor...

AI Technical Summary

Problems solved by technology

[0003] In order to reduce the impact of ambient temperature on the battery, when using the vehicle in winter, the PTC method is generally used to heat the battery to a certain temperature, but this heating method has two obvious disadvantages. One is that PTC heating needs to consume more batteries. The second is that in the initial stage, the battery temperature is low. At this time, the battery discharge has a great impact on the life of the battery itself and the loss of power.

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