Eco-friendly power source such as battery module for a transportation vehicle and method of manufacturing battery module

A battery module, comprising:

• a first sub-module and a second sub-module disposed in a first direction, the first sub-module and the second sub-module respectively including a plurality of battery cells stacked in a second direction, which is perpendicular to the first direction;
• a busbar bar assembly disposed on each of the first sub-module and the second sub-module and electrically connected to the plurality of battery cells, and including a first busbar assembly and a second busbar assembly facing each other with the plurality battery cells between in the first direction;
• and
• a terminal portion provided in the first busbar assembly and electrically connected to the plurality of battery cells,
• wherein the first sub-module and the second sub-module are disposed to be rotationally symmetrical to each other about a central axis, which is perpendicular to both the first direction and the second direction,
• wherein the first busbar assembly is positioned farther from the central axis than the second busbar assembly, and
• wherein the terminal portion is disposed closer to one side edge of each of the first sub-module and the second sub-module in the first direction than to the central axis.