Abstract: Power supply device includes battery stack in which a plurality of prismatic battery cells are stacked, end plate having a rectangular shape in plan view and having a pressing surface that covers an end surface of battery stack, and fastening member that fastens battery stack. End plate has, on a pressing surface, flat pressing regions respectively formed on end edge sides in the up-down direction, and bead region formed on the middle side in the up-down direction and bent in a shape protruding toward the back surface side of the pressing surface. Thus, strength can be improved by changing a shape in which bead region is formed in the middle while pressing regions that presses battery stack remains on end plate, which enables end plate having high strength to be provided at low cost.

Abstract: A power storage device includes: a plurality of power storage cells each including a case having a substantially rectangular parallelepiped shape with a bottom surface, the plurality of power storage cells being stacked along a first direction; a cooling plate provided on the bottom surface of the case in each of the plurality of power storage cells; and a heat transfer member provided between the bottom surface of the case and the cooling plate. The cooling plate is provided with a recess along deformation of the bottom surface of the case in a second direction orthogonal to the first direction.

Abstract: The vehicle battery system includes a plurality of battery blocks including a plurality of battery cells and an exterior case that stores the plurality of battery blocks. The exterior case includes a tubular case in which the upper case is fixed to lower case, a pair of end face plates fixed to both ends of the tubular case to close the openings at both ends, and partition walls fixed to the middle portion of the tubular case.

Abstract: Power supply device includes: a pair of end plates disposed on both ends in a stacking direction of battery stack constituted by stacking a plurality of secondary battery cells; and a plurality of fastening members fastening the pair of end plates together. Each of fastening members includes fastening main face having a flat plate shape and locking block fixed to a corner of fastening main face Each of end plates is formed with step that locks locking block while being fastened by fastening members, and has end plate screw hole opened near step. Each of fastening members has fastening side through hole opened so as to align with end plate screw hole while having each of end plates fastened, and has a fixing region fixing locking block to fastening main face disposed in a direction further away from each of end plates than fastening side through hole.