Battery management systems (BMS) are mandatory to connect different cells to a whole battery. For instance, electric vehicles (EV) require such a stack of individual cells in order to build up the intended cruising range. Due to slight differences in cell production and wear-out, each of the typical 10 to 100 cells inside a battery stack has its own “history”. Hence, the behaviour under load conditions and in standby varies. The purpose of the BMS is to supervise the individual cells and to prevent any case of overload. Our competences in the development, the production and field test of BMS is based on fruitful industrial projects. On top of that, we benefit from the strong professional network within the IPE and the collaboration with other centres of the KIT such as the competence centre for electrical energy storage, CompetenceE.