基于LPV模型的磷酸铁锂电池SOC实时算法

A real-time SOC estimation method of LiFePO_4 Li-ion battery based on LPV model

动力电池荷电状态(SOC)值是电动汽车整车控制策略和电池管理系统中的一个重要参数。文章以磷酸铁锂动力电池为研究对象,提出基于线性变参数(LPV)模型的电池SOC实时估算方法。该方法在电池特性试验研究的基础上,建立电池等效电路模型,将电池非线性系统转换为LPV系统,将其状态空间系数矩阵作为电池可测量的函数,设计滤波器算法,实现磷酸铁锂动力电池SOC的实时估算。利用Matlab软件建立该算法的仿真模型,仿真结果验证了SOC实时估算方法的可行性和准确性。

The state of charge（SOC）of power battery takes an important role in the control strategy and battery management of electric vehicle.Firstly,taking LiFePO4 Li-ion battery as the research object,a novel real-time SOC estimation method based on linear parameter-varying（LPV）model is proposed.Secondly,the battery equivalent circuit model is established by the battery performance test, and the nonlinear system of battery is converted to LPV system in which the state space matrix is a function of battery＇s measurable variable.And the filter algorithm is designed to achieve real-time SOC estimation of LiFePO4 Li-ion battery.Finally,the simulation model is established in Matlab and the results verify the feasibility and accuracy of the proposed method.