Abstract: With the rapid development of new energy vehicles, the thermal management technology of lithium-ion batteries has become a research hotspot. The phase change material （PCM） coupled heat pipe type battery thermal management system（BTMS） has emerged accordingly. Focusing on the optimization and improvement of composite PCM and the research of lithium-ion BTMS, this paper introduces several mainstream battery thermal management technologies, namely, the research progress of improving heat transfer rate, recovering thermal storage capacity, and reducing the cooling load of PCM, and summarizes the new coupled immersion cooling composite battery thermal management technology. It puts forward reasonable suggestions for the problems existing in the current lithium-ion battery thermal management system. The combination of multiple thermal management technologies, along with the intelligent thermal management system, is the trend of future development.

Key words: lithium-ion battery, composite phase change materials, thermal management system, intelligentization