Patent ID: 7019488

Claim:
An electric power vehicle power source device, comprising: a plurality of battery pack blocks connected in one of parallel and a combination of series and parallel, each of the battery pack blocks including a plurality of rechargeable batteries connected in series; and a plurality of battery electronic control units (ECUs) connected with each other through a communication line, each battery ECU corresponding to an address, managing an operating status of a corresponding battery pack block and exchanging information with a vehicle ECU; wherein one battery ECU of the plurality of battery ECUs is a master battery ECU and other battery ECUs of the plurality of battery ECUs are slave battery ECUs, such that operating power is supplied to the slave battery ECUs through a switch; wherein when stop information is received by the master battery ECU, the master battery ECU collects and stores data from the slave battery ECUs and controls the switch to discontinue the power supply to the slave battery ECUs; and wherein when start information is received by the master battery ECU, the master battery ECU controls the switch to supply power to the slave battery ECUs and to transmit the stored data to the slave battery ECUs.