The invention relates to a method and a device for controlling and/or regulating at least one operating parameter of an electrical energy storage device of a motor vehicle that influences an aging condition of the electrical energy storage device, in order to avoid an excessive deviation from the planned service life of the energy storage device, in particular a failure or premature replacement of the electrical energy storage device due to aging effects before the end of the planned service life. The method comprises the following steps: determining an actual aging condition (SOH) of the electrical energy storage device; determining a target aging condition (SOH) of the electrical energy storage device; and (i) adapting an operating parameter range permitted for the at least one operating parameter when a comparison of the actual aging condition (SOH) with the target aging condition (SOH) shows that the actual aging condition indicates increased aging compared to the target aging condition (SOH), wherein the operating parameter range is adapted such that operation of the electrical energy storage device (1) within the adapted operating parameter range occurs with reduced aging rate; and/or (ii) adapting the operating parameter range permitted for the at least one operating parameter when a comparison of the actual aging condition (SOH) with the target aging condition (SOH) shows that the actual aging condition indicates reduced aging compared to the target aging condition (SOH), wherein the operating parameter range is adapted such that operation of the electrical energy storage device (1) within the adapted operating parameter range occurs with increased aging rate.
