磷酸铁锂电池模型参数辨识与SOC估算

Research on SOC estimation and parameter identification of the LiFePO_4 Li-ion battery

根据磷酸铁锂电池的特性,从电池电化学角度分析,建立电池的等效电路模型。通过实验方法测得电池开路电压与SOC关系和电池模型的参数,利用卡尔曼滤波法来估算电池初始荷电状态(SOC_0).实验与仿真表明,该算法可以有效的估算出SOC初始值,并可以将误差控制在10%之内.

According to the characteristic analysis of the LiFePO_4 Li-ion battery,the battery model was established from the electrochemical angle.The experiment proudes the relationship between E_（OC） and SOC,and the parameters of battery model.The algorithm of kalman filter was used to estimate the initial value of SOC（SOC_0）.The electrochemical experiment and simulation shows that the algorithm could estimate the initial value of SOC more efficiently and the error could be controlled by less than ten percent.