Study on Thermal Simulation Technology of Liquid-Cooled Power Battery Pack Based on Coupling of Equivalent Circuit and Heat Flow

In the process of electric vehicle operation, the heat generated by the battery charge and discharge will cause the temperature of the battery to rise, and the temperature will affect the performance, service life and even combustion explosion of the battery. In the development of power battery pack, it is necessary to simulate and analyze the temperature field in the battery pack and combine the test of the battery bed to ensure that the thermal performance meets the requirements in the operation process. In this paper, the thermal simulation analysis model of the battery pack based on the coupling of equivalent circuit and the heat flow was established, and its simulation results were an agreement with test results. It is shown that the simulation method is correct, which can provide advices and suggestions for the design and development of EV power battery pack.