Circuit arrangement having an evaluation apparatus for determining the cell voltage (U i) of an individual cell (Z i) in a cell assembly composed of a series circuit comprising individual cells (Z i) of a rechargeable battery pack, wherein a potential point (P i) is formed in each case between electrically adjacent individual cells (Z i) of the series circuit, and the potentials of the potential points (P i) which follow one another in the series circuit increase in absolute value starting from a reference potential, wherein each potential point (P i) of the series circuit is connected to a measuring input of the evaluation apparatus via a measuring resistor (R i) and a switch (S i), wherein, by virtue of the circuit arrangement, a first potential point (P 1) is connected to the measuring input via a first resistor (Ri), and the potential points (P i) of the circuit arrangement which follow in the series are connected to the measuring input via measuring resistors (R i) having increasing values, and the circuit arrangement is designed to connect the individual voltages (U i) of a partial series circuit comprising the individual cells (Z i) to the measuring input as a summed voltage by closing a switch (S i), characterized - in that the measuring input is connected to the reference potential via a measuring capacitor, and the evaluation apparatus is designed to measure the charging time (t i) of the measuring capacitor at a predefined measuring voltage (U M), - and in that the evaluation apparatus is designed to use the charging time (t i) of the measuring capacitor and the time constant of the respective active measuring branch (R i ∗ C) as a basis for determining the potential of the potential point and the cell voltage (U i) of the individual cell (Z i). wherein a potential point (P i) is formed in each case between electrically adjacent individual cells (Z i) of the series circuit, and the potentials of the potential points (P i) which follow one another in the series circuit increase in absolute value starting from a reference potential, wherein each potential point (P i) of the series circuit is connected to a measuring input of the evaluation apparatus via a measuring resistor (R i) and a switch (S i), wherein, by virtue of the circuit arrangement, a first potential point (P 1) is connected to the measuring input via a first resistor (Ri), and the potential points (P i) of the circuit arrangement which follow in the series are connected to the measuring input via measuring resistors (R i) having increasing values, and the circuit arrangement is designed to connect the individual voltages (U i) of a partial series circuit comprising the individual cells (Z i) to the measuring input as a summed voltage by closing a switch (S i), characterized - in that the measuring input is connected to the reference potential via a measuring capacitor, and the evaluation apparatus is designed to measure the charging time (t i) of the measuring capacitor at a predefined measuring voltage (U M), - and in that the evaluation apparatus is designed to use the charging time (t i) of the measuring capacitor and the time constant of the respective active measuring branch (R i ∗ C) as a basis for determining the potential of the potential point and the cell voltage (U i) of the individual cell (Z i). - in that the measuring input is connected to the reference potential via a measuring capacitor, and the evaluation apparatus is designed to measure the charging time (t i) of the measuring capacitor at a predefined measuring voltage (U M), - and in that the evaluation apparatus is designed to use the charging time (t i) of the measuring capacitor and the time constant of the respective active measuring branch (R i ∗ C) as a basis for determining the potential of the potential point and the cell voltage (U i) of the individual cell (Z i).