Energy supply network, having - a controllable first energy store, which serves to control and supply electrical energy to an n-phase electric machine, where n ≥ 1, wherein the first energy store has n parallel energy supply branches (3-1, 3-2, 3-3), which • each have at least two energy storage modules connected in series, which each comprise at least one electrical energy storage cell having an associated controllable coupling unit, • are connected on the one side to a reference rail (T-) and • are connected on the other side to a respective phase (U, V, W) of the electric machine, and wherein, depending on the control signals, the coupling units interrupt the respective energy supply branch (3-1, 3-2, 3-3) by opening first switching elements (7, 7-311, 7-3m1) and second switching elements (7, 7-321, 7-3m1) of the associated controllable coupling unit, or bypass the energy storage cells and second switching elements (7, 7-312, 7-3m2) of the respective coupling unit by closing first switching elements (7, 7-311, 7-3ml) or are switched into the respective energy supply branch (3-1, 3-2; 3-3) by closing second switching elements (7, 7-312, 7-3m2), and - a second energy store (9; 9'), from which electrical loads (10; 10') can be supplied with DC voltage, and - a charging device for the second energy store (9; 9'), the output side of which charging device is connected to the second energy store (9; 9'), characterized in that the input side of the charging device is connected to the energy supply branches (3-1, 3-2, 3-3) of the first energy store and to the phases (U, V, W) of the electric machine. - a controllable first energy store, which serves to control and supply electrical energy to an n-phase electric machine, where n ≥ 1, wherein the first energy store has n parallel energy supply branches (3-1, 3-2, 3-3), which • each have at least two energy storage modules connected in series, which each comprise at least one electrical energy storage cell having an associated controllable coupling unit, • are connected on the one side to a reference rail (T-) and • are connected on the other side to a respective phase (U, V, W) of the electric machine, and wherein, depending on the control signals, the coupling units interrupt the respective energy supply branch (3-1, 3-2, 3-3) by opening first switching elements (7, 7-311, 7-3m1) and second switching elements (7, 7-321, 7-3m1) of the associated controllable coupling unit, or bypass the energy storage cells and second switching elements (7, 7-312, 7-3m2) of the respective coupling unit by closing first switching elements (7, 7-311, 7-3ml) or are switched into the respective energy supply branch (3-1, 3-2; 3-3) by closing second switching elements (7, 7-312, 7-3m2), and • each have at least two energy storage modules connected in series, which each comprise at least one electrical energy storage cell having an associated controllable coupling unit, • are connected on the one side to a reference rail (T-) and • are connected on the other side to a respective phase (U, V, W) of the electric machine, - a second energy store (9; 9'), from which electrical loads (10; 10') can be supplied with DC voltage, and - a charging device for the second energy store (9; 9'), the output side of which charging device is connected to the second energy store (9; 9'),