关于锂离子电池Thevenin模型的仿真研究

针对动力电池组运行时,内部的系统参数会随着环境因素和荷电状态(state-of-charge,SOC)发生动态改变,提出一种参数变化的Thevenin等效电路模型;从荷电状态是影响锂电池各参数特性的主要因素出发,将传统Thevenin模型中模拟各模块使用的不变参数用随着SOC变化的动态变量来表示; HPPC获取模型参数,电池仿真端电压基本上跟实际端电压波形吻合,且趋势大致相同;实验结果表明:在正常工作状态下,建立的模型可以有效地反应电池内部的工作特性,有着良好的精度。

Simulation Research on Thevenin Model of Lithium-ion Battery

A Thevenin equivalent circuit model with variable parameters is proposed for the dynamic change of internal system parameters with environment factors and state-of-charge (SOC) when power battery packs are running. Starting from the fact that the state of charge is the main factor affecting the parameters of lithium batteries, the traditional Thevenin model is used to simulate the invariant parameters of each module, and the proposed model is represented by the dynamic variables varying with SOC. HPPC gets the model parameters, and the simulated terminal voltage of the battery is basically consistent with the actual terminal voltage waveform, and the trend is consistent. The experimental results show that the model can effectively reflect the working characteristics of the battery under normal working conditions and has good accuracy.