Power supply device

A power supply device comprising:

• a plurality of battery cells including exterior cans and discharge valves, each of the plurality of battery cells including a corresponding one of the exterior cans and a corresponding one of the discharge valves, the corresponding one of the exterior cans having a tubular shape extending in one direction, the corresponding one of the discharge valves being provided at an end surface of the tubular shape of the corresponding one of the exterior cans, the corresponding one of the discharge valves being configured to discharge gas in response to an increase of an internal pressure of the corresponding one of the exterior cases;
• a plurality of battery blocks holding the plurality of battery cells, each of the plurality of battery blocks holding two or more battery cells out of the plurality of battery cells such that the exterior cans are parallel to one another and end surfaces of the exterior cans of the two or more battery cells are flush with a plane;
• a shield plate disposed in an insulation space between adjacent battery blocks out of the plurality of the battery blocks, a block surface of one of the adjacent battery blocks at which end surfaces of the exterior cans of the two or more battery cells faces, across the insulation space, a block surface of another of the adjacent battery blocks at which end surfaces of the exterior cans of the two or more battery cells;
• and
• a supporter supporting the shield plate, the supporter being provided on an inner side of outer peripheral parts of the block surfaces of the plurality of battery blocks facing each other, wherein
• the shield plate supported by the supporter includes an outer peripheral part that is a free end displaceable with respect to the supporter.