基于改进的二阶阻容等效电路模型的锂电池建模仿真

为了更加精确地描述锂离子电池的工作特性,在传统二阶Thevenin模型的基础上考虑电池的滞回电压特性与充放电电阻特性,建立改进的二阶阻容等效电路模型。在Matlab/simulink中建立电池仿真模型,通过HPPC实验对电池的参数进行辨识。借助Matlab中的Cftool工具箱对数据进行多项式拟合。之后经过恒流放电实验和脉冲放电实验对模型进行验证分析,通过仿真结果与实验结果的对比分析,发现该模型在恒流放电实验中仿真电压与真实电压的误差低于0.05V,在脉冲放电实验中的误差低于0.025V,验证了改进的锂离子电池模型的准确性,满足工程需要。

Lithium Battery Modeling and Simulation Based on Improved Second-order RC Equivalent Circuit Model

In order to describe the working characteristics of lithium-ion batteries more accurately,considering the hysteresis voltage characteristics and charge-discharge resistance characteristics of the battery,an improved second-order RC equivalent circuit model was established based on the traditional second-order thevenin model.The battery simulation model was built in Matlab/simulink,and the parameters of the battery were identified by HPPC experiment.Polynomial fitting of the data was performed using the Cftool toolbox in Matlab.After the constant current discharge experiment and pulse discharge experiment,it is found that the error between the simulated voltage and the real voltage in the constant current discharge experiment is less than 0.05V.The error in the pulse discharge experiment is less than 0.025V,which verifies the accuracy of the improved lithium ion battery model,it meets engineering needs.