Charging circuit (200, 300, 400, 500) for an electrical energy storage system having n electrical energy storage units (R1, R2, R3) that each have a first pole and a second pole, comprising - at least one first input and one second input for electrical connection to an energy source, - at least one first output and one second output for electrical connection to an electrical component, - at least n first pole connections and n second pole connections, an i-th first pole connection and an i-th second pole connection being able to be electrically conductively connected to the first pole of the i-th electrical energy storage unit (R1, R2, R3) and to the second pole of the i-th electrical energy storage unit (R1, R2, R3), respectively, - at least n first switches (S11, S12, S13), a first connection of the i-th first switch (S11, S12, S13) being electrically conductively connected to the i-th first pole connection of the i-th electrical energy storage unit (R1, R2, R3), - at least n second switches (S21, S22, S23), a first connection of the i-th second switch (S21, S22, S23) being electrically conductively connected to the i-th second pole connection of the i-th electrical energy storage unit (R1, R2, R3), - at least n-1 third switches (S31, S32), a first connection of the k-th third switch (S31, S32) being electrically conductively connected to the first pole connection of the k-th electrical energy storage unit (R1, R2, R3) and a second connection of the k-th third switch (S31, S32) being electrically conductively connected to the second pole connection of the k+1-th electrical energy storage unit (R1, R2, R3), n > 1 and i <=n, k < n being natural numbers, wherein the first output is electrically conductively connected to the second connection of the first switch, the second output is electrically conductively connected to the second connection of the first second switch, the first input is electrically conductively connected to the first connection of the n-th first switch (S12, S13), the second input is electrically conductively connected to the first connection of the first second switch, and the first switches (S11, S12, S13), the second switches (S21, S22, S23) and the third switches (S31, S32) are connected in such a way that in the charging mode a voltage level that is at least twice as high as a voltage level between the first output and the second output is applied between the first input and the second input by means of an energy source connected to the first input and the second input. characterized in that the second connection of the i-th second switch (S21, S22, S23) is electrically conductively connected to the second output and the second connection of the i-th first switch (S11, S12, S13) is electrically conductively connected to the first output. - at least one first input and one second input for electrical connection to an energy source, - at least one first output and one second output for electrical connection to an electrical component, - at least n first pole connections and n second pole connections, an i-th first pole connection and an i-th second pole connection being able to be electrically conductively connected to the first pole of the i-th electrical energy storage unit (R1, R2, R3) and to the second pole of the i-th electrical energy storage unit (R1, R2, R3), respectively, - at least n first switches (S11, S12, S13), a first connection of the i-th first switch (S11, S12, S13) being electrically conductively connected to the i-th first pole connection of the i-th electrical energy storage unit (R1, R2, R3), - at least n second switches (S21, S22, S23), a first connection of the i-th second switch (S21, S22, S23) being electrically conductively connected to the i-th second pole connection of the i-th electrical energy storage unit (R1, R2, R3), - at least n-1 third switches (S31, S32), a first connection of the k-th third switch (S31, S32) being electrically conductively connected to the first pole connection of the k-th electrical energy storage unit (R1, R2, R3) and a second connection of the k-th third switch (S31, S32) being electrically conductively connected to the second pole connection of the k+1-th electrical energy storage unit (R1, R2, R3), n > 1 and i <=n, k < n being natural numbers, the first output is electrically conductively connected to the second connection of the first switch, the second output is electrically conductively connected to the second connection of the first second switch, the first input is electrically conductively connected to the first connection of the n-th first switch (S12, S13), the second input is electrically conductively connected to the first connection of the first second switch, and the first switches (S11, S12, S13), the second switches (S21, S22, S23) and the third switches (S31, S32) are connected in such a way that in the charging mode a voltage level that is at least twice as high as a voltage level between the first output and the second output is applied between the first input and the second input by means of an energy source connected to the first input and the second input. characterized in that the second connection of the i-th second switch (S21, S22, S23) is electrically conductively connected to the second output and the second connection of the i-th first switch (S11, S12, S13) is electrically conductively connected to the first output.