Estimation of State of Charge for Lithium-Ion Battery Based on Finite Difference Extended Kalman Filter

Figure 8

Comparison of SOC estimation and error curve of DST data with EKF and FDEKF.

(a) Terminal current/voltage curves of DST data

(b) SOC estimation results of DST data with EKF and FDEKF

(c) SOC estimation errors of DST data with EKF and FDEKF