Battery thermal management system and electric vehicle

Abstract

The invention relates to a battery thermal management system. The battery thermal management system comprises: a lithium battery pack used for providing high-voltage current input for a vehicle in a normal-temperature environment; a storage battery pack which is connected with the lithium battery pack in parallel and used for providing high-voltage current input for the vehicle in a low-temperature environment; a battery management module which is used for selecting a power supply battery pack according to the temperature of the lithium battery pack, and controlling the storage battery pack tosupply power to the refrigerant subsystem and the coolant subsystem when the temperature of the lithium battery pack is lower than a preset temperature threshold value; a refrigerant subsystem whichcomprises a compressor and a heat exchange device, wherein the compressor and the heat exchange device are connected through a pipeline to form a loop; and a coolant subsystem, wherein a coolant of the coolant subsystem circularly passes through the heat exchange device and the lithium battery pack and is used for preheating the lithium battery pack. By implementing the invention, the influence ofstarting the power battery in a low-temperature environment on the electric quantity and the service life can be reduced.

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 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.

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