A rechargeable battery including an electrode assembly including a first electrode and a second electrode; a metal support plate electrically connected to the first electrode, the metal support plate being disposed on at least one side of the electrode assembly; and a case electrically connected to the second electrode and electrically insulated from the metal support plate, the case accommodating the electrode assembly and the metal support plate, wherein the metal support plate includes a protrusion protruding toward an inner side of the case.