Energy Storage Science and Technology ›› 2022, Vol. 11 ›› Issue (9): 2959-2970.doi: 10.19799/j.cnki.2095-4239.2022.0123

• Special Issue for the 10th Anniversary • Previous Articles     Next Articles

Review of CO2 heat pump and thermal management for pure electric vehicle

Jiangfeng LI1,2(), Shuaiqi LI1, Xianzhen RUAN3, Lei XU3, Xiaochun ZHANG3, Wenji SONG1(), Ziping FENG1   

  1. 1.Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, Chain
    2.University of Chinese Academy of Science, Beijing 100049, China
    3.GAC R&D Center, Guangzhou 510640, Guangdong, China
  • Received:2022-03-09 Revised:2022-04-01 Online:2022-09-05 Published:2022-08-30
  • Contact: Wenji SONG E-mail:lijiangfengqaz@163.com;songwj@ms.giec.ac.cn

Abstract:

"Carbon peak" and "Carbon-neutrality" goals have accelerated the electrification goal of the transportation industry. Electric vehicles face severe range degradation and refrigerant selection problems due to low-temperature heating. Therefore, this paper summarizes the CO2 heat pump air-conditioning technology and the entire vehicle thermal management system to improve the electric vehicle range. The advantages and disadvantages of four new refrigerants, R134a, R1234yf, R290, and CO2, are analyzed. The characteristics of the basic transcritical CO2 cycle system are introduced, and the optimization of the basic transcritical CO2 cycle system is emphasized; it includes the transcritical CO2 cycle system with a regenerator and with the technology of adding gas and increasing enthalpy. To apply heat pump air conditioning in electric vehicles, the working modes and characteristics of the direct heat pump with three heat exchanger systems and the secondary loop system are described. For the whole vehicle thermal management of CO2 heat pump air conditioning, the requirements of the occupant compartment, power battery, and drive thermal motor management of electric vehicle are introduced. Finally, it is concluded that the CO2 heat pump air conditioning system will effectively solve the serious problem of the battery range attenuation of electric vehicles in the winter and play a significant role in vehicle thermal management. At the same time, the problems of refrigeration, pressure resistance, sealing, control, and integration under high-temperature conditions require further exploration.

Key words: electric vehicle, CO2, heat pump, air conditioning, heat management

CLC Number: