Device and Method for Increasing the Range of an Electric Vehicle

A device and method for increasing the range of a vehicle, which is driven by an electric motor and a high-voltage battery, include an electronic control unit which is programmed such that on the basis of the high-voltage battery charge state, which is continuously estimated in an updated manner, a corresponding remaining range is displayed to the driver. A lower charge state limit is defined, which is associated with a remaining range to be displayed of null when the charge state is estimated in an error-free manner. The lower charge state limit is associated with a defined first minimally permissible cell voltage limit. During a driving operation, it is determined whether a greater range is being displayed than what can be demanded on the basis of the current charge state due to an estimation error. The display is not corrected by the estimation error difference. And, an emergency mode is automatically activated if an estimation error has been detected, wherein the cell voltage is reduced below the first cell voltage limit in the emergency mode.