METHOD FOR DETERMINING THE PERFORMANCE CAPABILITY OF ELECTRICAL VEHICLE ENERGY STORES

The present invention relates to the field of electric vehicles, in particular to a method for determining the performance capability of an electrical vehicle energy store. A method is provided that allows the performance capability of electrical energy stores to be ascertained from outside a vehicle without accessing its internal communication and electronics systems. The method may be implemented using a charging device. The performance capability is related to the resistance and/or the energy storage capacity of the electrical energy store. The resistance is ascertained using a variable charge or discharge current, the variable current having a defined rise or fall in a defined period and reaching a predefined amperage. The performance capability is calculated either using the measured resistance using known or ascertainable relationships, for example using statistics or prior measurement, or by analysis via the measurement period, charge current and advantageously information about the voltage.