基于LPV理论锂离子电池SOC估算研究

以磷酸铁锂电池为研究对象,在进行了电池特性实验的基础上确定电池电压特性以及开路电压与SOC关系。以二阶等效电路模型为基础,结合LPV理论及EKF原理,在Simulink中搭建电池仿真模型,实现了电池模型参数与SOC的联合估算,设计实验验证了模型的正确性。并嵌入整车模型模拟运行,电池SOC工作区间符合控制策略,设计的磷酸铁锂电池SOC估算方法可行有效。

Research of LiFePO4 battery SOC estimation based on LPV theory

LiFePO4 battery was researched.Battery voltage characteristics and the relationship between SOC and open circuit voltage were acquired based on many battery characteristics experiments.Battery simulation model was established in Simulink based on equivalent circuit model of second order,LPV theory and EKF principle.The joint estimation of SOC and battery model parameters was implemented in the simulation.The accuracy of the model was guaranteed by designed text.Finally,the battery model was embedded in vehicle model.The simulation result shows that SOC maintains at a reasonable interval and conforms to the control policy.The SOC estimation design was feasible and effective.