Rechargeable battery

A rechargeable battery comprising:

• an electrode assembly comprising a first electrode, a second electrode, and a separator between the first electrode and the second electrode;
• a case accommodating the electrode assembly;
• a cap plate coupled to the case;
• a first current collector coupled to the first electrode of the electrode assembly;
• a first terminal assembly comprising a first terminal coupled to the first current collector and having a first fixed groove or a first fixed protrusion, and a second terminal having a second fixed groove coupled to the first fixed protrusion or a second fixed protrusion coupled to the first fixed groove, wherein, of the first and second terminals, the first terminal is entirely covered by a combination of the second terminal and the cap plate and only the second terminal is exposed and wherein the first terminal comprises a first material, and the second terminal comprises a second material different from the first material, and
• a first terminal plate exposed by the cap plate, wherein the first terminal plate is coupled to the second terminal, and wherein the first terminal plate and the second terminal are made from the same material.