State of Charge and Parameter Estimation of Lithium-ion Batteries for HEVs and EVs

Abstract

This paper discusses the accuracy of the simultaneous state of charge (SOC) and parameter estimation method of the batteries for hybrid electric vehicles (HEVs) and electric vehicles (EVs) use. Although it is important to determine the battery aging, to control the charging and the discharging, and/or to maintain battery fault detections, the accuracy of the parameter estimation has not been thoroughly discussed. To address this issue, physico-chemical study using simultaneous state and log-normalized parameter estimation of batteries is provided in this paper. The proposed method is verified by performing a series of experiments using an EV.