Patent ID: 8586230

Claim:
A battery module, comprising: a plurality of rechargeable batteries, each rechargeable battery including a positive electrode terminal and a negative electrode terminal formed of different materials; a bus bar electrically connecting the plurality of rechargeable batteries; a first terminal plate on which the bus bar is installed, the first terminal plate being coupled to the positive electrode terminal via a first welding portion, the positive electrode terminal having a rivet shape to overlap the first terminal plate, and the battery module further including a first boundary portion at an end portion of the positive electrode terminal that has the rivet shape overlapping the first terminal plate; and a second terminal plate on which the bus bar is installed, the second terminal plate being coupled to the negative electrode terminal via a second welding portion, the negative electrode terminal having a rivet shape to overlap the second terminal plate, and the battery module further including a second boundary portion at an end portion of the negative electrode terminal that has the rivet shape overlapping the second terminal plate, at least one of the first welding portion and the second welding portion being a friction stir weld.