电动汽车用氢镍电池二阶RC模型的研究

Research on second-order RC circuit model of Ni-MH battery for EV

将二阶RC电路模型应用于电动汽车用氢镍电池,该模型用一个电阻和两组RC来模拟电池充放电过程中的动态特性,首先用快速法测出开路电压(OCV)与荷电状态(SOC)之间的关系曲线,其次用指数拟合法和极值法求出模型参数,最后将不同脉冲电流下取得的参数值取平均作为最终的模型参数。仿真结果表明了该模型的有效性和良好的动态跟踪性。

A second-order RC circuit model was applied to Ni-MH batteries for electric vehicles.In the model,a resistor and two RC were used to simulate the dynamic characteristics of the battery in the charging and discharging process.Firstly,the relationship curve between OCV and SOC with the rapid method was detected,then,the parameters of the model were derived by the methods of exponential curve fitting and evaluating limit,and finally the averages under different pulse currents as final model parameters were obtained.The results of simulation show that the model has good dynamic tracking performance.