POWER SUPPLY DEVICE, AND VEHICLE AND ELECTRICAL STORAGE DEVICE EACH EQUIPPED WITH SAME

The power source apparatus is provided with a plurality of modules 10, and a main controller 2 connected with communication interface units 16 in each module 10 via a communication line CB. Each module 10 is provided with a battery block 12 having a plurality of battery cells 11 stacked together and connected in series and/or parallel, a battery state detection section 14 to detect the state of the battery cells 11, communication interface units 16 for data communication with other modules 10 and the main controller 2, and a memory section 18 that can store data received through the communication interface units 16. The plurality of modules 10 are connected in series and/or parallel with an output line OL.