SECONDARY BATTERY PROVIDED WITH INSULATOR

摘要

The present invention provides a secondary battery having a jelly roll of anode/separator/cathode construction disposed in a cylindrical battery case, wherein a plate-shaped insulator disposed on the upper end of the jelly roll comprises: an opening, which penetrates the insulator, for discharging gas and allowing electrode terminals to pass through; fine pores, each of which has a size that allows electrolytes to pass through but prevents foreign substances from passing through; and protruding parts, each of which has a strip or a bead shape, and which are formed laterally and/or longitudinally on one or both sides of the insulator.