考虑滞回效应的锂离子电池二阶电热耦合模型

A Second-Order Coupled Electro-Thermal Model for Lithium-Ion Batteries Considering Hysteresis Effect

针对目前锂电池建模时电池滞回效应以及电池温度对建模精度的综合影响,在电池等效电模型和热模型基础上,建立了一种电热耦合模型。首先通过MATLAB参数拟合工具箱仿真得出电池的滞回电压,利用查表法建立等效电模型,然后使用最小二乘方法得出热模型的参数,再通过等效模型与热模型公式中的发热项进行电热耦合,最后通过实验,对不同温度下的电池模型恒流、动态工况进行对比分析。实验结果表明,所建立的电热耦合模型能够较好地贴合电池的工作特性,工况下与实验电压误差为10 mV左右,比传统二阶RC模型精度提高了约0.013 V。

Aiming at the battery hysteresis effect and the comprehensive influence of battery temperature on modeling accuracy when modeling lithium batteries,an electro-thermal coupling model based on the battery equivalent electrical model and thermal model is established.First,the hysteresis voltage of the battery is obtained through the MATLAB Parameter Estimator simulation,the equivalent electrical model is established by the look-up table method,and then the parameters of the thermal model are obtained by the least square method,and then the equivalent model and the thermal model formula are used.The heating items of the battery are electrically and thermally coupled,and finally through experiments,the constant current and dynamic working conditions of the battery model at different temperatures are compared and analyzed.The experimental results show that the established electrothermal coupling model can better fit the working characteristics of the battery,and the error between the experimental voltage and the experimental voltage is about 10 mV under working conditions,which is about 0.013 V higher than the accuracy of the traditional second-order RC model.