Abstract: A spacer of a battery module includes a plurality of bars provided extending in a width direction of adjacent battery cells and arranged at an interval from each other, a first fin, and a second fin. The first fin of the battery module takes a shape extending upward from the bar toward one of the battery cells and contact a principal surface of the battery cell. The second fin takes a shape extending downward from the bar toward the other battery cell and contact a principal surface of the other battery cell. A fin length of the first fin and a fin length of the second fin are each smaller than the interval between the bars. The sum of those fin lengths is larger than the interval between the bars.

Abstract: A battery pack includes a battery stack including a plurality of battery cells and a case member in which the battery stack is housed. The case member includes an end wall part located on one end of the battery stack in a stacking direction and continuously integrated with a floor part, and a mounting-shape part located on an opposite end from the end wall part and configured to mount a panel-shaped member. The battery stack is retained in the case member while being held by compression between the end wall part and the end panel on the other end. The end panel is pressed against the mounting-shape part in a direction away from the end wall part by compression reaction force of the battery stack, and fixed therein.

Abstract: A battery pack includes a battery stack including a plurality of battery cells and a case member in which the battery stack is housed. The case member includes an end wall part located on one end of the battery stack in a stacking direction and continuously integrated with a floor part, and a mounting-shape part located on an opposite end from the end wall part and configured to mount a panel-shaped member. The battery stack is retained in the case member while being held by compression between the end wall part and the end panel on the other end. The end panel is pressed against the mounting-shape part in a direction away from the end wall part by compression reaction force of the battery stack, and fixed therein.