Patent ID: 8895169

Claim:
A secondary battery in which a jelly-roll type electrode assembly (“jelly-roll”) in which a cathode comprising a cathode active material coated portion on at least one surface of a cathode current collector, an anode comprising an anode active material coated portion on at least one surface of an anode current collector, and a separator disposed therebetween are wound and an electrolyte are accommodated in a battery case, and at least one of a cathode lead coupled to a cathode uncoated portion and an anode lead coupled to an anode uncoated portion comprises a first metal layer used for coupling with an electrode uncoated portion and/or coupling with the battery case and a second metal layer having a relatively lower resistance than that of the first metal layer, wherein the first and second metal layers are coupled with each other, wherein the first metal layers are respectively coupled to opposite side surfaces of the second metal layer such that the first metal layer and the second metal layer are coplanar.