US Patent 9373828 Power supply device for electric vehicle

A power supply device structure wherein connection terminals of a battery case are held in a floating state inside the battery case, without using screws or soldering. A battery pack for mounted to and detached from a vehicle includes the battery case for accommodating battery cells for supplying electric power to an electric motor. Battery case side terminals are accommodated in an insulator block. A plurality of ribs, project from a wall part of the battery case and are disposed along an outer surface of the insulator block. The insulator block is provided at its outer circumference with two flanges and an intermediate part located therebetween. The outer circumferential surface of the intermediate part is loosely fitted in an opening of the battery case, with a gap therebetween.