MANDREL FOR MANUFACTURING ELECTRODE ASSEMBLY OF CYLINDRICAL SECONDARY BATTERY

The present invention relates to a mandrel for manufacturing an electrode assembly The mandrel can minimize deformation even when having a smaller diameter than is typical of a mandrel used in a winding process when manufacturing an electrode assembly of a cylindrical secondary battery. The mandrel for manufacturing an electrode assembly comprises: a first mandrel member which has a semicircular cross-section and is of a predetermined length; and a second mandrel member which, when abuttingly joined to the first mandrel member, forms a cylindrical shape therewith, and which is provided with uneven portions, allowing protrusions and recesses to engage with each other, along the length direction on the surface joined to the first mandrel member.