ELECTRODE ASSEMBLY AND SECONDARY BATTERY COMPRISING SAME

The present invention relates to an electrode assembly and a secondary battery comprising same. Since an anode tab and a cathode tab are welded to a plurality of anode uncoated portions and a plurality of cathode uncoated portions of the electrode assembly to serve as a current collector plate, the present invention can prevent a roundness decrease, deformation, etc., which can be caused by expansion of a silicon-based anode active material that is applied for high capacitance, and at the same time, promotes high power output and low resistance. To this end, the present invention relates to an electrode assembly comprising: a cathode plate to which a cathode tab is attached; an anode plate to which an anode tab is attached; and a separator interposed between the cathode plate and the anode plate, the electrode assembly being wound while the cathode plate, the separator, and the anode plate are laminated, wherein the cathode plate protrudes more upward than the separator and the anode plate so as to be exposed through an upper surface of the electrode assembly, and the anode plate protrudes more downward than the separator and the cathode plate so as to be exposed through a bottom surface of the electrode assembly, wherein the cathode tab extends along the upper surface of the electrode assembly while in contact with the cathode plate exposed through the upper surface of the electrode assembly, and is welded to a plurality of cathode plates being contacted, and the anode tab extends along the bottom surface of the electrode assembly while in contact with the anode plate exposed through the bottom surface of the electrode assembly, and is welded to a plurality of anode plates being contacted. La présente invention concerne un ensemble d'électrodes et une batterie secondaire le comprenant. Comme une languette d'anode et une languette de cathode sont soudées à une pluralité de parties non revêtues d'anode et une pluralité de parties non revêtues de cathode de l'ensemble d'électrodes pour servir de plaque collectrice de courant, la présente invention peut empêcher une diminution de la rondeur, déformation, etc, qui peut être provoquée par l'expansion d'un matériau actif d'anode à base de silicium qui est appliqué pour une capacité élevée, et en même temps, favorise une sortie de puissance élevée et une faible résistance. A cet effet, la présente invention concerne un ensemble d'électrodes comprenant : une plaque de cathode à laquelle est fixée une languette de