Patent ID: 8871378

Claim:
A secondary battery comprising: a bare cell including a can, an electrode assembly, and a cap assembly including a protection circuit assembly and an electrode terminal, wherein: the protection circuit assembly includes a protection circuit plate including a first plate and a second plate, the first plate is metal and covers an opening of the can, the second plate includes an insulating layer and a conductive metal pattern, the second plate includes a lower surface, and the entire lower surface of the second plate directly contacts an upper surface of the first plate, the electrode terminal extends through the first and second plates, a distance between opposing short sides of the second plate is shorter than a distance between opposing short sides of the first plate, a distance between opposing long sides of the second plate is shorter than a distance between opposing long sides of the first plate, and the first plate is welded to an upper end of the can through an outer periphery thereof exposed out of the second plate to seal the can.