CONICET | Buscador de Institutos y Recursos Humanos

Abstract: The prediction of the remaining discharge-time in real-time isan important Battery Management System indicator in many engineeringapplications. It is the time in which the battery satisfies the loaddemanded until the voltage reaches its admissible lower limit. It isoften obtained by the difference between the current and final chargescaled by a constant discharge current. The final charge can be obtainedusing a simple battery model like a pure integrator which leads to asimple but inaccurate solution. A more precise estimation is obtained byrunning models that take into account the Rate Capacity Effect but theyare time consuming.In this paper we propose to use the Lambert function for an accurateand fast prediction of the remaining discharge-time using a simpleelectrochemical model. We demonstrate that the errors in the predictionare similar to that obtained by running the well known electricalcircuit. In order to illustrate the method, experimental parameteridentification and remaining discharge-time predictions are carried outusing a commercial Lithium-ion battery type.