SECONDARY BATTERY AND MANUFACTURING METHOD THEREFOR

A button-type secondary battery of the present invention comprises: a first can of which a first side surface is vertically disposed along a circumference of a first base surface; a second can which has a second base surface having a diameter greater than that of the first base surface of the first can and of which a second side surface is vertically disposed along a circumference of the second base surface, wherein a vent hole is punched in the second side surface; and a gasket disposed between the first side surface and the second side surface when the first can and the second can are coupled to each other, wherein the first can and the second can are coupled to each other so that the first side surface is inserted inside the second side surface and the gasket is deformed so that the gasket is fitted into the vent hole, thereby fixing the first can and the second can.A method for manufacturing a button-type secondary battery of the present invention, in which a first can of which a first side surface is vertically disposed along a circumference of a first base surface and a second can which has a second base surface having a diameter greater than that of the first base surface of the first can and of which a second side surface is vertically disposed along a circumference of the second base surface are coupled to each other, comprises: a step of preparing the first can; a step of preparing the second can; a punching step in which a vent hole punched in the second side surface of the second can; a coupling step in which a gasket is disposed between the first side surface of the first can and the second side surface of the second can, and the first can and the second can are coupled to allow the gasket to face the vent hole; and a fixing step in which the gasket is deformed to allow the gasket to be fitted into the vent hole so as to fix the first can and the second can.