Patent ID: 8728655

Claim:
A secondary battery, comprising: a case providing an inner space; at least one electrode assembly, the at least one electrode assembly: including a stacked and wound positive electrode plate, negative electrode plate, and separator between the positive electrode plate and the negative electrode plate, and being disposed within the case and including a non-coating portion on an end thereof; a collector plate including alternately arranged crests and troughs, the non-coating portion of the electrode assembly directly contacting the crests at a lower portion of an inflection point of the crests, and the crests being welded to the non-coating portion, wherein the troughs extend into the non-coating portion of the electrode assembly and electrically connect adjacent crests; a collector terminal coupled to one end of the collector plate, the collector terminal protruding upwardly from the case; and a cap plate on an upper portion of the case, the cap plate sealing the case.