Method and device for measuring, in real time and in situ, thermodynamic data of a battery (enthalpy and entropy)

Abstract

The invention relates to a method and a device for measuring, in real time and in situ, thermodynamic data of a battery (enthalpy and entropy). The object of the invention is to provide a reliable method for measuring, in situ, online and in real time, the variation in entropy (ΔS) of a battery. To this end, the method is characterized in that it consists primarily in: (phase I) producing a prior model of the battery: (a) charging the battery; (b) and/or discharging the battery; (c) measuring actual variables; (d) modeling the electrical behavior of the battery during charging (a) and/or discharging (b) in order to estimate the electrical parameters of the battery; (e) estimating electrical parameters of the battery; (f) modeling the thermal behavior of the battery during charging (a) and/or discharging (b) in order to estimate ΔS in situ, online and in real time; (g) estimating ΔS, by using at least one of the electrical parameters estimated in step (d); (phase II) measuring ΔS of the battery during use in any application and with any state of charge by carrying out step (d) and step (f) of phase I, step (c) and step (g); (phase III) optionally storing the data measured/calculated in phase II and/or in phase I. The invention also relates to a method for determining the state of charge and the state of health of a battery on the basis of these thermodynamic data. Another subject of the invention is a device for implementing this method.