Battery heat management system for electromobile

Abstract

A battery heat management system for an electromobile comprises an internal heat exchanger, a water tank, a water pump, a water pump, a compressor, a condenser, a condenser fan, an expansion valve, an external heat exchanger for cooling and a heating device supportive of being on and off. The condenser is divided into a refrigerating agent passing area and a temperature adjusting medium passing area through baffles in collection pipes arranged at two ends; the compressor, the condenser, the expansion valve and the external heat exchanger are connected through a pipeline to form a refrigerating agent circulating loop; the internal heat exchanger, the water pump and the external water exchanger are connected to form a first battery temperature adjusting medium circulating loop; the internal heat exchanger, the water pump and the condenser are connected to form a second battery temperature adjusting medium circulating loop. Multiple circulating loops are arranged in the battery heat management system, so that switching among different circulating loops can be realized according to different environment temperatures; when environment temperature is high, the inside of a battery pack can be cooled effectively; when the environment temperature is low, temperature of the battery pack can be increased effectively, so that most proper temperature can be maintained in the battery pack constantly.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a battery thermal management system for electric vehicles. Background technique [0002] In the automotive field, pure electric vehicles or gasoline-electric hybrid vehicles do not produce harmful substances or produce less harmful substances than traditional fuel vehicles, so they have better development prospects. For pure electric vehicles or electric hybrid vehicles, since batteries are used as power sources, they are currently mainly equipped with a separate thermal management system for cooling the batteries. At present, the thermal management system for cooling the battery generally adopts the air-water heat exchange method to cool down. The heat exchange efficiency of this cooling method is not high. Cooling needs, but when the ambient temperature is high, such as in a high temperature environment in summer, this heat exchange method cannot fully me...

AI Technical Summary

Problems solved by technology

At present, the thermal management system for cooling the battery generally uses air-water heat exchange to cool down. The heat exchange efficiency of this cooling method is not high. Therefore, when the ambient temperature is not too high, it can basically meet the needs of the battery. Cooling needs, but when the ambient temperature is high, such as in the high temperature environment in summer, this heat exchange method cannot fully meet the cooling needs of the battery, which will adversely affect the service life of the battery

In addition, when the external ambient temperature is low, usually lower than 10°C, the charging and discharging of the battery, especially charging, will also have an adverse effect. When the ambient temperature is lower than 0°C, it is difficult to achieve charging. up

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