Patent ID: 8623540

Claim:
A rechargeable battery, comprising: a case housing an electrode assembly; a cap plate sealing the case; a first insulator disposed on an outer surface of the cap plate, a pair of electrode terminals penetrating the cap plate and the first insulator; and a bus bar coupled to one of the electrode terminals, wherein: the cap plate and first insulator include a first joining unit coupling the first insulator and the cap plate, the first insulator and bus bar include a second joining unit selectively coupling the first insulator and the bus bar, the first joining unit includes: an outer protrusion that is monolithically formed with the cap plate and that protrudes from the cap plate, and a concave outer groove in the first insulator, the outer protrusion has a shape that is complementary to the outer groove, the pair of electrode terminals includes a positive electrode terminal and a negative electrode terminal, the second joining unit includes a positive joining portion and a negative joining portion, the positive joining portion being adjacent to the positive electrode terminal and the negative joining portion being adjacent to the negative electrode terminal, the first insulator includes a positive first insulator adjacent to the positive electrode terminal and a negative first insulator adjacent to the negative electrode terminal, the positive joining portion includes a protrusion on the positive first insulator and a complementary groove in the bus bar, and the negative joining portion includes a protrusion on the negative first insulator and a complementary groove in the bus bar.