Patent ID: 7462416

Claim:
A secondary battery comprising: an electrode assembly having a first electrode tab and a second electrode tab; a can for containing the electrode assembly therein, the can having a top opening; a cap assembly including an electrode terminal and a cap plate having a surface insertable within the can for covering the top opening of the can, the surface having a protective device groove; and a thermo-breaker seated in the protective device groove, and being connected between the first electrode tab and the electrode terminal, the thermo-breaker comprising: a bimetal having an end connected to the first electrode tab; a terminal lead wire having a first end connected to the electrode terminal and having a second end in contact with the bimetal; and a case having a closed space into which the bimetal and the terminal lead wire are mounted, the case comprising a box-type case body with an open top, the box type case body having a bimetal hole adapted to receive the bimetal.