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The prospect of a decreasing supply of fossil energy sources necessitates the search for alternative ways of individual transport. An important step is the electrification of the drive train and further vehicle components, enabling a total control of the overall energy flow while at the same time offering more degrees of freedom in optimizing the vehicle architecture. The current status of the development of a vehicle energy management for a single source Battery Electric Vehicle is presented. A central ECU, a bench test system and a simulation model were developed. The energy management strategy presented can help to improve the lifetime of EV's batteries, which finally needs to be evaluated in vehicle prototype tests. This work has been supported by the European Commission under grant no. 258133.