Battery module, and battery pack and vehicle comprising same

Discussed are a battery module, and a battery pack and a vehicle including the battery module. A battery module may includes a plurality of battery cell stacks, each battery cell stack including a plurality of battery cells that are stacked therein, a case to accommodate the plurality of battery cell stacks, an air circulation duct between the plurality of battery cell stacks and having a plurality of holes formed therein, and an exhaust fan coupled to a side of the air circulation duct, wherein the plurality of holes of the air circulation duct may have different sizes.