Research on Thermal Characteristics of Electric Vehicle Power Battery Under Pulse Current Excitation Based on COMSOL Simulation
With the rapid development of electric vehicles(EVs),the comprehensive performance of lithium-ion batteries,as the main power source of EVs,has received more and more attention.However,the performance of power batteries in low tem-perature environment is seriously degraded,which affects the development and popularisation of electric vehicles in the northern cold regions.As one of the core technologies of the battery thermal management system,low-temperature preheating technology can effectively alleviate the performance degradation of power batteries in low-temperature environments.In this paper,the basic parameters of the battery were obtained through experiments,and the pulse heating model of the battery was built based on the COMSOL simulation software to explore the change of the temperature rise rate of the battery during the heating process and the temperature distribution of the module.The results show that pulse heating can effectively increase the temperature of the battery at low temperature.During the heating process,the temperature distribution in the battery module is uniform,the average tempera-ture difference is 0.55℃,and the temperature tends to gather to the center of the battery module.In addition,the heating effect of pulse current heating is compared with that of electric heating film heating,and it is verified that the heating effect and tempera-ture consistency of pulse heating are better than that of electric heating film heating.
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