Secondary Battery and Manufacturing Method for Same

Proposed is a secondary battery and a method for manufacturing the secondary battery. The secondary battery according to the present disclosure includes a housing provided with an interior space inside having an end, a cap coupled to the end of the housing, an injection hole penetrating the cap to communicate with the interior space of the housing, and an surface provided obliquely at an inlet of the injection hole, wherein a surface roughness of the oblique surface is different from a surface roughness of an adjacent surface of the cap. A method of manufacturing a secondary battery comprises manufacturing a cap coupled to an end of a housing of the secondary battery, creating an injection hole in the cap, cleaning the cap, and roughening an oblique surface created at the inlet of the injection hole.