Abstract:In order to study the temperature characteristics of the power battery pack and maintain its working temperature within the optimal temperature range, a lithium-ion battery is taken as the research object, and a battery thermal management system for the hybrid vehicle is proposed. The air conditioning system and the engine exhaust system are used to regulate the temperature of battery pack. A three-dimensional transient heat generation numerical model of the lithium battery pack was established. The size of the battery pack and the inlet air flow rate were used as input parameters to reduce the maximum temperature rise of the battery pack and improve the temperature uniformity of the battery pack as output parameters, In order to reduce the maximum temperature rise of the battery pack and increase the temperature uniformity, the structure of the battery pack was designed and optimized by using FLUENT simulation software and DesignXplorer module. The optimized temperature rise of the battery pack was 5.39 K lower than that before optimization, and the temperature difference was reduced by 6.41 K. The effects of constant rate discharge and convective heat transfer coefficient on the temperature rise were analyzed. The research shows that the higher the discharge rate, the faster the temperature rise of the battery. The higher the temperature of the battery after the discharge is completed, the heat dissipation effect is obvious when the convective heat transfer coefficient is less than 30 W/(m2·K). By the simulation analysis of the heating or cooling of the battery pack under different conditions, the feasibility of the battery thermal management system was verified.
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