Device and Method for Braking and Stopping a Vehicle in an Emergency

A device for braking a vehicle includes an actuator configured to control a brake of the vehicle for braking the vehicle. The device further includes a first battery configured to be electrically connected to the actuator via a first switching device and to supply energy to the actuator. The device further includes a second battery configured to be electrically connected to the actuator via a second switching device and to supply energy to the actuator. The device further includes a controller configured to detect a state of the energy supplied to the actuator by the first battery and switch the second switching device to electrically connect the second battery to the actuator instead of the first battery in order to supply energy to the actuator when the state indicates that a need exists.