Charging of an energy store

A method for charging an energy store that has at least three energy storage strings, with each of the energy storage strings having a plurality of energy storage modules and each of the energy storage modules having at least one energy storage element that can receive and store energy, the energy storage strings being connected to at least one star point, the energy store further having at least two switching elements, and the energy store being electrically connected to an electric machine, the method comprising:

• connecting the star point of the energy store to an energy source that provides a charging voltage;
• operating the at least two switching elements in accordance with whether the energy source is a DC voltage source or an AC voltage source so that the respective energy storage modules of at least one of the energy storage strings are each connected in parallel or in series with one another and/or so that at least one of the energy storage modules of at least one of the energy storage strings is bypassed;
• directly electrically connecting an output connection of the energy source to an input connection at the star point of the energy store;
• and
• charging the energy storage modules with the charging voltage provided from the energy source to the energy store via the star point of the energy store.