A battery pack includes a plurality of battery modules that are stackable in a stacking direction, each of the plurality of battery modules extending in a longitudinal direction perpendicular to the stacking direction. Each of the plurality of battery modules includes a battery cell and a cartridge configured to receive the battery cell. The cartridge includes a seat part configured to seat the battery cell, and a heat dissipation part made of a first type of material different from a second type of material of the seat part, the heat dissipation part being configured to absorb heat generated from the battery cell.