Provided is a battery module in which weldability between electrode leads and/or between an electrode lead and a bus bar is improved. The battery module includes: a cell assembly that includes a plurality of secondary batteries stacked in at least one direction, respectively including electrode leads, and electrically connected to each other via a connection between the electrode leads; and at least one bus bar that includes an electrically conductive material and is electrically connected by contacting the electrode leads of the plurality of secondary batteries, wherein at least one of the electrode leads is combined and fixed to at least one of another electrode lead and the at least one bus bar, which are contacted by the at least one of the electrode leads, via a welding spot formed in a tornado shape.