CLEANING SYSTEM

The present specification provides a cleaning system including two or more dummy cans configured to clean a surface of a crimping device used for a process of crimping a cylindrical secondary battery for sealing an opened upper end of a battery can in which an electrode assembly and a cap assembly are accommodated, in which the two or more dummy cans each have a brush provided on an outer surface thereof, and the surface of the crimping device is cleaned by the brush.