BUTTON-TYPE SECONDARY BATTERY

The present invention relates to a button-type secondary battery, and more particularly, to a button-type secondary battery, in which strong coupling force between a base plate, an electrode terminal, and an insulating gasket is generated while reducing a thickness of a top plate assembly formed by bonding the base plate covering an opening of a can body, in which an electrode assembly is inserted, the electrode terminal bonded to the base plate, and the insulating gasket insulating the base plate and the electrode terminal from each other.The button-type secondary battery according to the present invention relates to a button-type secondary battery having a diameter greater than a height thereof, the button-type secondary battery including an electrode assembly, a can body into which the electrode assembly is inserted, a base plate configured to cover an opening of an upper end of the can body and bonded to the can body, an electrode terminal of which at least a portion is inserted into a through-hole formed inside the base plate to cover the through-hole, and an insulating gasket configured to insulate the electrode terminal from the base plate, wherein the electrode terminal, the insulating gasket, and the base plate are bonded to each other through thermal fusion.