Patent ID: 8680868

Claim:
A battery cell measurement system comprising: a signal generator coupled to a pulse density modulation circuit, the pulse density modulation circuit generating a control signal which drives a switch, the switch being connected between a first terminal of a battery cell and a first terminal of a bleeding impedance, a second terminal of the bleeding impedance being coupled to a second terminal of the battery cell; the first terminal of the bleeding impedance being coupled to a first terminal of a second switch, the second terminal of the bleeding impedance being coupled to a first terminal of a third switch, a second terminal of the second switch and second terminal of the third switch being coupled to each other and further coupled to a low-pass filter, a signal generated by the low-pass filter being inputted into an analog to digital converter, the analog to digital converter providing a signal which is representative either for one of a signal across the bleeding impedance, or a signal between the terminals of the battery cell.