Simultaneous State and Parameter Estimation of Li-Ion Battery with One State Hysteresis Model Using Augmented Unscented Kalman Filter

An online technique for simultaneous state and parameter estimation of an electric or hybrid vehicle battery using an augmented unscented Kalman filter (AUKF) is proposed. Battery state of charge (SOC), the prime state variable, is estimated. In addition the battery internal resistance, time constants, and resistance of the resistance-capacitance (RC) pairs are also estimated. While the two RC pairs of the equivalent circuit capture voltage …