SPECTROSCOPIC BATTERY-CELL IMPEDANCE MEASUREMENT ARRANGEMENT

摘要

A battery cell measurement system comprising a signal generator coupled to a pulse density modulation circuit generating a control signal which drives a switch 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 battery cell terminal. The first terminal is coupled to a first terminal of a second switch. The second terminal is coupled to a first terminal of a third switch. A second terminal of the second switch and second terminal of the third switch are coupled and are further coupled to a low-pass filter. A signal generated by the low-pass filter is inputted into an analog to digital converter, which provides a signal representative of either a signal across the bleeding impedance, or a signal between the battery cell terminals.