CONTROLLER, ELECTRIC POWER SYSTEM COMPRISING THE CONTROLLER, METHOD OF OPERATING THE SYSTEM, AND VEHICLE COMPRISING THE SYSTEM

An electric power system for an electric vehicle, including: first charging and discharging current paths connected to a first battery unit; second charging and discharging current paths connected to a second battery unit; third charging and discharging current paths for a connection with an electric control system of the vehicle; a first power switch between the first discharging current path and the third discharging current path; a second power switch between the second discharging current path and the third discharging current path; a controlling unit to set the first and second power switches based on states of the accumulators, at least one of the first and second battery units being swappable. A controller, a method, and a vehicle comprising the system are also disclosed.