A METHOD AND SYSTEM FOR STATE OF CHARGE ESTIMATION OF ELECTRODES IN AN ELECTROCHEMICAL CELL

摘要

A method and system for estimating State of Charge (SOC) of electrodes in an electrochemical cell using measured terminal voltage and current signals of the battery is disclosed. A battery SOC estimator estimates SOC of electrodes by processing a formulated electrochemical model, at least one estimated parameters of the formulated electrochemical model and measured voltage and output current signals. The electrochemical model is formulated by considering solid state diffusion for the electrodes, an equivalent variable resistor model for an electrolyte and an electrochemical relation between electrodes SOC. The parameters of the formulated electrochemical are estimated by solving the electrochemical model equations consistently and thereby minimizing the error with Hybrid Pulse Power Characterization (HPPC) pulse data at various SOCs. FIG. 5