BATTERY PACK

Embodiments provide a battery pack. The battery pack includes a pack housing with a base plate and a side wall parallel to the base plate, a lid on the side wall of the pack housing, a battery cell assembly provided on the base plate of the pack housing and including a plurality of battery cells arranged in a first direction perpendicular to a mounting surface of the base plate and an upper cover covering the plurality of battery cells, and a plurality of spacers between the lid and the upper cover, and each of the plurality of spacers is inserted into the upper cover.