BATTERY PACK

Disclosed herein relates to a battery pack for accommodating battery modules, including: a pack case in which a battery module is settled; wherein the pack case includes: a main separation wall; a base plate coupled to each side of the main separation wall, and including a module area in which the battery module is settled; and a side wall coupled along a perimeter of a base plate coupled to the main separation wall; wherein the main separation wall includes: a heat dissipation part, which includes a heat dissipation fin protruded to allow heat dissipation, at a lower part.