Patent ID: 8390246

Claim:
A battery charge state transmission device used in an external charging system for a plurality of external charge vehicles, each of which includes an electric motor as a travel drive power source and a battery for supplying electric power to the electric motor, the external charging system including a plurality of external charging devices provided externally to the vehicles for charging the battery from an external side of each vehicle and a management station for managing the plurality of external charging devices, the battery charge state transmission device provided to transmit charge state information indicating a state of charge of the battery to a management station device, the battery charge state transmission device comprising: a charge state information acquisition part configured to acquire the charge state information from the plurality of external charging devices charging the vehicles or from the plurality of vehicles being charged by the plurality of charging devices; and a station transmission part configured to transmit a plurality of charge state information to the management station device in a lump, the plurality of charge state information being acquired by the charge state information acquisition part.