BATTERY MODULE

A battery module (1) includes: a plurality of battery cells (100) arranged side by side in a first direction, each of the plurality of battery cells (100) having a prismatic shape; and a partition wall portion (260, 270) provided between the plurality of battery cells (100) to secure electrical insulation between the plurality of battery cells (100). The partition wall portion (260, 270) includes a first partition wall portion (260) and a second partition wall portion (270), the first partition wall portion (260) and the second partition wall portion (270) being provided alternately, the second partition wall portion (270) having a shape different from a shape of the first partition wall portion (260), the second partition wall portion (270) forming a cooling space (280) between the second partition wall portion (270) and each of two battery cells (100) located on both sides beside the second partition wall portion (270) in the first direction.