1.6 Slitting

After calendaring, the wide electrode rolls are precisely cut into narrower strips, known as daughter rolls or bobbins, to match the specific dimensions required for the target cell format—whether for cylindrical winding or pouch/prismatic stacking.

Slitting is performed using either mechanical rotary knives or laser cutting systems, depending on the material and required precision. Additional cleaning steps, such as fume extraction or rotating brush systems, may be integrated to remove fine particles generated during cutting.

Achieving clean, burr-free edges is essential to prevent short circuits, material shedding, or alignment issues during cell assembly. Sub-roll widths typically range from 100 mm to 300mm, but vary based on electrode design and cell specifications.