| 摘要 |
A cap assembly for a secondary battery, coupled to an open end of a battery can free from a beading portion, includes a top cap disposed on an uppermost portion in a protrusive form to form a cathode terminal, a safety element disposed below the top cap to contact the top cap, a safety vent disposed to contact the safety element, a gasket surrounding outer circumferences of the top cap, the safety element and the safety vent, a cover surrounding the gasket so that the top cap, the safety element and the safety vent closely adhere to each other, and a welding member disposed at an upper portion of the cover and having an outer end located to protrude more outwards than the outer end of the cover so as to be placed on the open end of the battery can, the welding member having a first notch formed at an upper surface thereof, which protrudes more than the outer end of the cover, and being welded to the open end of the battery can at a portion where the first notch is formed. |
