IN-SITU BATTERY DIAGNOSIS METHOD USING ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY

摘要

Method of estimating the internal state of an electrochemical system for electric power storage, such as a battery.;The SoC and the electrochemical impedance are determined for various internal states of an electrochemical system of the same type as the electrochemical system studied. An electrochemical impedance model is then defined as a function of the SoC and of parameters. These parameters are calibrated through adjustment on the electrochemical impedance measurements obtained for the various internal states. The electrochemical impedance Z of the system studied is determined and its SoC is estimated using the model applied to electrochemical impedance Z.