The primary task of battery thermal management design is to accurately calculate the temperature of the battery under different working conditions. In order to achieve accurate calculation of battery temperature and improve the rapidity and economy of battery thermal management simulation calculation, a simulation method for battery thermal management is proposed in this paper. This method builds a second order RC equivalent model of the battery cell based on the HPPC constant current charge–discharge test data to calculate the heat generation of the cell. At the same time, the three-dimensional heat transfer model of the battery cell, the three-dimensional heat transfer model of the cold plate and the three-dimensional heat transfer model of the whole package are one-dimensional equivalent. After one-dimensional equivalent, the whole package one-dimensional heat transfer model is simulated under various conditions of high, low and normal temperature. The simulation results are compared with the test results. The simulation calculation time is greatly shortened and the test cost is reduced. At the same time, the Amesim/Simulink co-simulation model of the battery thermal management system is established, and the virtual calibration of the control model of the BMS thermal management system is realized.