Battery system comprising at least a battery module having a plurality of strand-switchable coupling units battery modules and methods of operation of the battery system

The present invention relates to a battery system having at least one battery module strand with a plurality of serially arranged battery modules, each having one or more battery cells and are equipped with a switchable coupling unit for coupling the respective battery module to the battery module strand. The battery system is adapted to be generated by alternate switching of the coupling units a time varying output voltage of the battery module strand. The coupling units each comprising such semiconductor devices, and / or at least one inductive component comprising circuitry through which a current limiting at least in the direction of a charging current of a battery module is reached.