Battery module and cooling thereof

A battery module (101, 102, 103, 104, 105) according to an exemplary embodiment of the present invention includes: a plurality of rechargeable batteries (10); a housing (23) incorporating the rechargeable batteries (10); and a plurality of protrusions (18, 35, 36, 45, 55, 56, 57, 65b, 66b, 67b) allowing the rechargeable batteries (10) to be spaced from each other in order to acquire a stable cooling function, wherein the rechargeable batteries (10) are stacked and arranged to form a plurality of battery arrays (12, 13, 14, 32, 33, 34, 42, 43, 44, 52, 53, 54) and the battery arrays (12, 13, 14, 32, 33, 34, 42, 43, 44, 52, 53, 54) stacked in a flow direction of the cooling medium are different from each other in the number of protrusions (18, 35, 36, 45, 55, 56, 57, 65b, 66b, 67b) located between the rechargeable batteries (10).