| 摘要 |
Disclosed is a secondary battery having a novel structure in which a jelly-roll type electrode assembly ("jelly-roll") in which a cathode including a cathode active material coated portion on at least one surface of a cathode current collector, an anode including 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 includes a first metal layer used for coupling with an electrode uncoated portion and/or coupling with a 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 to each other. |
