Button Type Secondary Battery

Abstract: The present invention relates to a button-type secondary battery characterized by comprising: a cup having an open upper side and having an electrode assembly and an electrolyte mounted therein; a top plate coupled to the upper end of the cup to close the open upper side of the cup, and having a through hole formed therein; a positive electrode terminal including a protrusion portion having a diameter that can be inserted into the through hole and a locking portion having a larger diameter than the through hole, wherein the protrusion portion is inserted into the through hole of the top plate such that the locking portion is positioned outside or inside the cup; and a gasket that is inserted for insulation at the position at which the protrusion portion and the locking portion come into contact with the top plate when the protrusion portion of the positive electrode terminal is inserted into the through hole, wherein the gasket adheres the positive electrode terminal to the top plate. According to the present invention having the above technical features, the gasket sealing the interface between the positive electrode terminal and the top plate adheres the positive electrode terminal to the top plate, thus eliminating the need for riveting of the positive electrode terminal or a similar coupling structure. Therefore, the overall thickness of the secondary battery may be thinner.

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