HEAT MANAGEMENT SYSTEM OF ELECTRIC VEHICLE BASED ON HEAT PUMP AND ENERGY RECOVERY OF REMOVABLE BATTERY

In order to manage the air-conditioning thermal system, battery thermal system and motor thermal system in a unified manner, the author proposes a self -devel-oped integrated thermal management system for electric vehicles to recover bat-tery energy. Firstly, the problems in the development of electric vehicles and the importance of thermal management system are introduced, secondly, the self -de-veloped thermal management system scheme and the principle of each part are analyzed, the experimental results of thermal system in enthalpy difference cham-ber are also introduced. The experimental results show that: Under the double evaporation system, when the compressor speed is 4500 rpm, the maximum COP is 2.46, and the maximum COP charge is 1180 g, the maximum heat transfer ca-pacity is 4819 W (wind side heat transfer + water side heat transfer), the evapora-tion temperature is 5.35 degrees C, the evaporation superheat is 9.5 degrees C, the condensation temperature is 59.3 degrees C, the undercooling degree is 10.4 degrees C, the suction pressure is 280 kPa, and the exhaust pressure is 1694 kPa. In conclusion, the thermal manage-ment system has great energy saving effect, which ensures that the electric vehicle range will not be greatly attenuated under winter heating conditions, and meets the requirements of comfort.