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|1. (WO2018025785) WINDING CORE, DEVICE FOR MANUFACTURING WOUND ELECTRODE, AND METHOD FOR MANUFACTURING WOUND ELECTRODE|
|Title:||WINDING CORE, DEVICE FOR MANUFACTURING WOUND ELECTRODE, AND METHOD FOR MANUFACTURING WOUND ELECTRODE|
An embodiment of the present invention provides a winding core and device and method for manufacturing a wound electrode. The winding core is provided for manufacturing a wound electrode including a positive electrode, a separator having a surface dynamic friction coefficient of 0.2 or greater, and a negative electrode. The winding core has an elongated main body part having, on a surface thereof, a contact surface part which is in contact with the separator. The contact surface part has a plurality of linear groove parts which are provided in the longitudinal direction of the main body part, and which has a maximum width greater than or equal to 1 μm and less than 1 mm in the direction perpendicular to the longitudinal direction. In the projected area when the contact surface part is viewed in a plan view, the total area A of the groove parts and the area B, in which the groove parts are not present, satisfy the relationship represented by 0.1≤A/(A+B)≤0.8.