BUTTON-TYPE SECONDARY BATTERY AND METHOD FOR MANUFACTURING SAME

The present invention relates to a button-type secondary battery which may comprise: an electrode assembly; a lower can including a reception part having a reception groove formed on an upper surface thereof to receive the electrode assembly, a connection part formed to extend outwards from the upper end of the reception part, and a bent part formed to extend from a tip end of the connection part in a downward direction of the reception part; an upper can including a cover part disposed on the upper surface of the reception part to close the reception groove, and a coupling part formed along an edge surface of the cover part and coupled to the bent part; and a gasket provided between the lower can and the upper can, wherein a recess-type lower insertion groove and a recess-type upper insertion groove are formed in the coupling part of the upper can and the bent part of the lower can with which the gasket is in close contact, respectively, and the lower insertion groove and the upper insertion groove are positioned to be spaced apart from each other so as not to face each other.