Patent ID: 9705112
Date: 2017-07-11
CPC Classifications: H01M,Y02E

Claim:
1. A secondary battery constructed in a structure in which an electrode assembly having a cathode/separator/anode arrangement is mounted in a battery case made of a laminate sheet including a resin layer and a metal layer, electrode tabs of the electrode assembly are coupled to corresponding electrode leads, and the electrode assembly is sealed in the battery case while electrode leads are exposed to the outside of the battery case, wherein a protective film is attached to coupling regions between the electrode tabs and the electrode leads for sealing the coupling regions between the electrode tabs and the electrode leads; wherein the electrode assembly is a stacking type or a stacking/folding type electrode assembly including a structure in which a plurality of cathodes and a plurality of anodes are stacked while a plurality of separators are disposed respectively between the cathodes and the anodes, and a plurality of electrode tabs (cathode tabs or anode tabs) are coupled with an electrode lead (a cathode lead or an anode lead) by welding; wherein the electrode tabs extend from the upper ends of electrode current collectors by a length of 5 to 10 mm that is sufficient to prevent the separators from being overlapped with the protective film; wherein the separators have a width dimension of about 3.1 cm and a length dimension of about 4.5 cm; wherein the protective film has a length sufficient to wrap the coupling regions; wherein the welded parts are spaced apart from the upper ends of the electrode current collectors; and wherein the plurality of cathodes, the plurality of anodes, and the plurality of separators of the electrode assembly are stacked in a first direction, and wherein the coupling regions extend substantially within a plane that is substantially perpendicular to the first direction.