Secondary battery and a secondary battery module

The present invention relates to a secondary battery (20) including an electrode assembly (60) including a positive electrode (61), a negative electrode (62), and a separator (63) therebetween; a case (50) for accommodating the electrode assembly (60); a cap assembly (40) for sealing the case; and at least one terminal unit including a multi-metal electrode rivet (12,13) electrically connected to one of the electrodes of the electrode assembly, the multi-metal electrode rivet including a head part (12a,13a) and a tail part (12b,13b), and, a rivet terminal (22) being electrically connected to the multi-metal electrode rivet. The rivet terminal and the tail part are formed of the same metallic material, and the head part is formed of a different metallic material.