Patent ID: 6462510
Filing Date: 2002-10-08
Classification: B60L,G01R,Y02T,Y04S

Abstract:
A battery voltage detecting device provided in a battery power source device used as a drive power source of an electric motor for a vehicle, wherein a plurality of rechargeable battery cells are serially connected in a battery pack, the cells being divided into a plurality of groups each including a predetermined number of serially connected cells to form a plurality of battery modules, the battery pack being mounted on the vehicle with its ground potential being electrically insulated from ground potential of an electric circuit system of a controller for the vehicle, the battery voltage detecting device comprising:a plurality of voltage detection circuits, respectively provided to the plurality of battery modules, each of the plurality of voltage detection circuits comprising: a differential detecting system that detects a voltage across end terminals of at least one battery module, open/close systems which open and close and that connect and disconnect the differential detecting system to and from the end terminals of the battery module, an A/D converter for digitizing the detected voltage of the battery module output from the differential detecting system, an output data transmission system that transmits data output from the A/D converter to the electric circuit system of the controller for the vehicle electrically insulated therefrom, and an open/close signal transmission system that transmits an open/close signal output from the electric circuit system of the controller for the vehicle to the open/close systems electrically insulated therefrom; and an operating power source electrically insulated from the ground potential of the electric circuit system of the controller for the vehicle for providing each of the voltage detection circuits separately with operating power.