SECONDARY BATTERY AND BATTERY PACK

According to one embodiment, in a secondary battery, a first container member has an accommodating space defined by a bottom wall and side walls, and includes a flange on a side opposite to the bottom wall, the flange projecting outward from an opening edge of the accommodating space. A second container member is welded to the flange. The attachment member attached to the first container member includes a base abutting on an outer surface of the bottom wall, and a side plate part extended from the base toward a side on which the flange is located. The side plate part faces an outer surface of the side wall with a gap therebetween, and a passage for a refrigerant is defined in the gap between the side plate part and the side wall.