A winding needle assembly and a winding device. The winding needle assembly (30) is used for winding an electrode plate and a separator (42c), and comprises a first winding needle (31) and a second winding needle (32), wherein the first winding needle (31)...

A mandrel member (100) of a winder for a secondary battery, which is mounted in a winder configured to manufacture a jelly roll-type electrode assembly by winding a stack of a first electrode plate (21), a separator (22), and a second electrode plate (23),...