Abstract: With the increasing popularity of new energy vehicles, various OEMs have invested more and more in new energy car, and there are more and more car models, and the battery packs corresponding to each model are also different. In order to understand the performance of the battery in the early stage of the battery pack design, this paper designs a simulation model of the power battery pack based on Matlab/Simulink. This simulation model can simulate the temperature change curve, voltage change curve and state of charge change curve of the battery by inputting battery parameters, simulate the precharge time and high voltage output change curve by inputting the parameters of the relay and high voltage system, and simulate the battery by importing the vehicle operating conditions. Real-time status of operation (temperature, voltage, state of charge, etc.). These change curves have important reference value for the selection of cells and the selection of pre-charging resistors. After the curve analysis after simulation, this model is consistent with the electrochemical characteristics of the battery, and the high-voltage change is also consistent with the physical change characteristics, which can be used as a reference for the selection of cells and pre-charging resistors.

Key words: Electric vehicle; Power battery; Cell battery; Cell battery temperature; Cell battery voltage; Simulation model design; Matlab/Simulink

摘要： 随着新能源汽车的普及，各个整车厂在新能源车型投入的越来越多，车型也越来越多， 而每个车型对应的电池包也不同。为了在电池包设计前期了解电池的性能，基于 Matlab/ Simulink 设计了一种动力电池包的仿真模型。此仿真模型可以通过输入电池参数仿真出电池 的温度变化曲线、电压变化曲线以及荷电状态变化曲线，通过输入继电器和高压系统参数仿 真出预充时间和高压输出变化曲线，通过导入车辆工况仿真出电池运行的实时状态（温度、 电压、荷电状态等）。这些变化曲线对于电芯的选型以及预充电阻的选型具有重要的参考价值。 经过仿真后的曲线分析，此模型与电池的电化学特性相符，高压变化也符合物理变化特性， 可以用作电芯和预充电阻的选型参考。

关键词: 电动汽车；动力电池；单体电池；单体温度；单体电压；仿真模型设计；Matlab/Simulink