Button-type secondary battery and method for manufacturing the same

Abstract

The present invention relates to a button-type secondary battery including: an electrode assembly; a lower can provided with an accommodation part having an accommodation groove for accommodating the electrode assembly in a top surface thereof, a connection part extending outward from an upper end of the accommodation part, and a bent part extending from a front end of the connection part to a lower side of the accommodation part; an upper can provided with a cover part disposed on a top surface of the accommodation part to finish the accommodation groove and a bonding part formed along an edge surface of the cover part and bonded to the bent part; and a gasket provided between the lower can and the upper can, wherein a recessed lower insertion groove and a recessed upper insertion groove are formed in the bent part of the lower can and the bonding part of the upper can, which are in close contact with the gasket, respectively, and the lower insertion groove and the upper insertion groove are disposed to be spaced apart from each other so as not to face each other.