The LPV Method for Estimating the Power Battery Based on Hysteresis Coupled Model and Power Conversion

Battery SOC has different value caused by different battery rated capacity under different charge-discharged rate. In view of the national standard using C/3 discharged rate to define battery rated capacity, this article proposes that charging and discharging capacity in different current should be unified to C/3 discharging capacity through the power conversion coefficient. Meanwhile, the battery hysteresis characteristics have a great impact on the battery model. This paper consider these two factors, establish battery equivalent circuit model, and embed model parameter identification to LPV-Kalman model. Experiment shows that, this SOC estimation method has higher accuracy.