State of charge and State of health estimation method based on measurement fusion and dual extended Kalman filter for combining the inhomogeneity of cell characteristics

Abstract

This paper proposes an SOC (state of charge) and SOH (state of health) estimation technique using sensor fusion method to solve the problem of battery system stability deterioration due to voltage variation in cell-to-cell. In order to reflect the cell-to-cell variance, we use the measurement fusion method based on the multi cell model. From this model, the dual extended Kalman filter is utilized for estimating the SOC and SOH.