Patent ID: 8883340

Claim:
A secondary battery, comprising: a case having an internal space; an electrode assembly in the case, the electrode assembly including a positive electrode, a negative electrode, a separator between the positive electrode and the negative electrode, and a non-coating portion; a pair of collector plates, each collector plate including a plate section having a surface that faces the electrode assembly and protrusions that extend substantially perpendicularly from the surface of the plate section, the protrusions being inserted into and coupled to the non-coating portion; a collector terminal coupled to one end of the pair of collector plates, the collector terminal protruding upwardly from the case; and a cap plate coupled to a top end of the case and sealing the case, wherein: the pair of collector plates is coupled to the non-coating portion of at least one of the positive electrode and the negative electrode, the protrusions of one of the collector plates are alternately coupled between the protrusions of another of the collector plates and the non-coating portion by butt welding, at least one of the protrusions of one of the pair of collector plates butts against the plate section of the other of the pair of collector plates, and the non-coating portion is disposed on only one side surface of each of the protrusions to which the non-coating portion is coupled.