SYSTEM AND DEVICE FOR CHARGING THE ENERGY STORAGE CELLS OF AN ENERGY STORAGE DEVICE

摘要

The invention relates to a method for charging the energy storage cells of an energy storage device, which comprises: n first output connections, wherein n > 1, for issuing a supply voltage at each of the output connections, a second output connection, wherein a charging device can be connected between the first output connections and the second output connection, and n parallel-connected energy supply branches, which are each coupled between a first output connection and the second output connection, wherein each of the energy supply branches comprises a plurality of series-connected energy storage modules, which each comprise an energy storage cell module comprising at least one energy storage cell, and a coupling device having coupling elements that are designed to selectively connect or bridge the energy storage cell module in the respective energy supply branch. The method according to the invention comprises the following steps: determining a maximum possible charging voltage of a charging apparatus, which provides a charging voltage for the energy storage device; determining the maximum number of the energy storage cell modules of an energy supply branch at which the sum of the output voltages of the energy storage cell modules, which is dependent on the instantaneous charge states of the energy storage cells of all the energy storage cell modules of an energy supply branch, is still lower than the maximum possible charging voltage; and selecting and controlling the coupling elements of energy storage modules of the energy supply branch, such that in each case only the maximum number of energy storage cell modules is coupled into the energy supply branch.