Performance Research on Heating Performance of Battery Thermal Management Coupled with the Vapor Injection Heat Pump Air Conditioning

Compared to the use of positive temperature coefficient (PTC) materials that consume electrical energy for low-temperature heating, heat pump air conditioners can provide more energy-efficient heating performance by absorbing and utilizing heat from the outdoor air to heat the cab in order to improve the range of electric vehicles. In addition, in order to make the battery work under safe working conditions, this paper proposes battery thermal management coupled with vapor injection heat pump air conditioning. The system is modeled and analyzed through simulation, and the impact of the compressor speed and ambient temperature changes in the battery cooling performance of the system. The results show that under different compressor RPM (Revolution Per Minute) with an ambient temperature of 5 degrees C, the average temperature of the battery pack remains below 30 degrees C, and the majority of individual cell temperatures are maintained within the range of 20 to 35 degrees C. At a constant compressor RPM of 4000/min under varying ambient temperatures, the average temperature of the battery pack remains below 30 degrees C, with the majority of individual cell temperatures staying within the range of 20 to 35 degrees C. And the battery cooling performance still performs well. In the low temperature of -10 degrees C and -20 degrees C, the system can still maintain a relatively stable heating capacity compared with the 2009.1W, provided by the environment temperature of 5 degrees C at the same RPM.