基于电化学热耦合模型的电池热管理研究OA北大核心CSTPCD

In rapid charging and discharging process,power lithium batteries generate a substantial amount of heat,posing the risk of heat accumulation and thermal runaway.Therefore,thermal management is essential for battery safety.This study first establishes an electrochemical-thermal coupling model for batteries and investigates the temperature rise characteristics of batteries.Then,a battery thermal management system based on composite phase change materials(CPCMs)is designed to regulate battery temperature during high-rate discharge.Finally,the temperature control effect of the battery thermal management system on battery temperature and temperature difference is compared under different battery spacing conditions.The numerical simulation results show that during the 3 C rate discharge process of a single battery,the maximum temperature of the battery is 58.9℃.However,using phase change materials for battery cooling,even at an ambient temperature of 35℃,the maximum temperature and temperature difference of the battery can be effectively controlled at 46.1℃ and 3.6℃,respectively,thereby ensuring safe operation of the battery,extending the service life of the battery pack,and improving battery safety performance.Moreover,the analysis of the solid-phase ratio of CPCMs shows that maintaining a non-zero solid-phase ratio effectively controls battery temperature and temperature difference.However,when the solid-phase ratio of CPCMs in the thermal management system is zero,the battery pack temperature and temperature difference rapidly increase.Therefore,analyzing the solid-phase ratio index of CPCMs proves beneficial for their application and the optimization of thermal management systems.