An eco-friendly power source, such as a battery module for a transportation vehicle, including a housing having an internal space; a cell stack accommodated in the internal space and including a plurality of battery cells; a busbar assembly including a busbar electrically connecting the plurality of battery cells to each other; and an insulation cover assembly preventing short circuit between the busbar and the housing, wherein the insulation cover assembly includes a cover frame disposed between the busbar and the housing; and a short-circuit prevention member coupled to the cover frame.