A winding apparatus includes a winding pin, a pair of first clamp pins configured to move away from each other after the winding pin is withdrawn from an electrode assembly to stretch the electrode assembly, and second clamp pin(s) configured to support an upper half portion of the electrode…

Disclosed are a winding apparatus and a winding method, the winding apparatus includes: a winding needle, being configured to wind a winding material; a power supply assembly, being configured to be electrically coupled to the winding needle, so as to form current on an axis of the winding needle…

A microporous membrane winding includes a microporous membrane wound around a core. The core has an outer diameter of 5 inches or greater, and has an outer surface with a surface roughness of 3.0 µm or less. A microporous membrane that is excellent in thickness uniformity and is favorably used as a…