Patent ID: 8692556
Filing Date: 2014-04-08
Classification: G01R

Abstract:
1. A voltage detection device for an assembled battery including a plurality of unit batteries connected in series, the voltage detection device being configured to detect a voltage of each of the unit batteries of the assembled battery, the voltage detection device comprising: an operational amplifier having an input terminal biased at a predetermined reference voltage; first capacitors provided respectively to the unit batteries; first switch devices each provided between a high-voltage-side terminal of corresponding one of the unit batteries and one end of corresponding one of the first capacitors; second switch devices each provided between a low-voltage-side terminal of corresponding one of the unit batteries and the one end of corresponding one of the first capacitors; third switch devices each provided between an inverting input terminal of the operational amplifier and an other end of corresponding one of the first capacitors; a second capacitor and a fourth switch device provided in parallel between the inverting input terminal of the operational amplifier and an output terminal of the operational amplifier; and a control unit configured to detect the voltage by implementing the following first and second processes in order: