CLEANING SYSTEM

A cleaning system may include two or more dummy cans configured to clean a surface of a crimping device. The crimping device may be 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. The two or more dummy cans each may include a brush provided on an outer surface thereof, and the surface of the crimping device is cleaned by the brush.