锂离子动力电池分数阶变阶二阶RC等效电路模型

he power battery is the main bottlenecks of the scale development of electric vehicles, and the modeling technology is significant in the design and the safe operation of battery and its management system. Currently, the model accuracy is finited in the second-order RC equivalent circuit model of battery with the traditional integer-order modeling. In fact, the strong nonlinear characteristics of battery are more suitable to be simulated by the fractional model. To this end, a fractional variable-order second-order RC equivalent circuit model is proposed; and the model output and experimental data is basicly in agreement under the working conditions of pulse and constant current charging and discharging, where the maximum model error is less than 0.05V, thus, the proposed model is applied for electric vehicles. And the experimental results show the effectiveness of the model.