Provided is a battery module. The battery module includes a lower cooling tube arranged in the lower cooling plate, an upper cooling tube arranged in the upper cooling plate, the upper cooling tube being connected to the lower cooling tube and arranged in a different plane than the lower cooling tube, and a branching portion connecting the lower cooling tube to the upper cooling tube, wherein the branching portion includes a lower connection tube connected to the lower cooling tube, an upper connection tube connected to the upper cooling tube, a lower connection housing arranged to surround an outer surface of the lower connection tube, and an upper connection housing arranged to surround an outer surface of the upper connection tube, the upper connection housing being coupled to the lower connection housing.