A battery module includes a plurality of battery cells, a cell frame configured to receive the plurality of battery cells, a busbar configured to connect the plurality of battery cells to each other in series and/or in parallel, and a bonding wire configured to electrically connect the battery cells to the busbar. The busbar includes one or more first busbars located at an upper part of the cell frame and two second busbars located at opposite side surfaces of the cell frame. The cell frame and the busbar are integrally formed by insert injection molding.