SOC Estimation of Lithium-Ion Battery by Extended Kalman Fixed Lag Smoother

抄録

This paper is concerned with the State-of-charge (SOC) estimation for lithium-ion batteries by the Extended Kalman Fixed Lag Smoother (EKFLS). The Extended Kalman Filter (EKF) has been often used as an SOC estimation method for lithium-ion batteries. We employ the EKFLS for the SOC estimation focusing on the fact that the EKFLS can utilize more information than the EKF for the estimation. The effectiveness of the proposed method is verified by a charge-discharge experiment on a 18650 type lithium-ion battery.