Continuous slitting is a key process in the manufacturing of lithium-ion battery electrodes, following coating, drying, and rolling. The core purpose is to roll the large, wide, and continuous electrode sheet material, and according to the size requirements of the battery design, use precision cutting tools to cut it longitudinally at high speed and accurately into multiple narrow electrode sheet materials of the required width, preparing for subsequent winding or laminating processes.

The standard workflow mainly includes the following steps:

Unwinding and automatic correction: Install the rolled mother roll material onto the unwinding reel. Before entering the slitting area, the polarizer is first subjected to real-time edge tracking and automatic correction through a photoelectric sensor or CCD detection system to ensure that the polarizer enters the slitting device at an accurate position, which is the basis for ensuring the accuracy of the slitting width.

Precision slitting: Under constant tension traction, the polarizer passes through a precision configured upper and lower disc cutter set (or razor) at high speed. According to the preset width value, the sharp tool continuously and smoothly cuts the polarizer longitudinally, dividing it into multiple independent narrow strips. This process requires extremely high precision, sharpness, and concentricity of the cutting tool to avoid burrs, metal shavings, or edge tearing.

Independent winding and dust removal: Multiple narrow pole pieces after cutting are wound up by independent winding shafts under the action of tension control system. During the winding process, it is necessary to maintain stable tension and neat rolls to prevent snaking, wrinkling, or edge collapse. Usually, equipment is equipped with ion air rods or vacuum cleaning devices to promptly remove trace debris that may be generated during the cutting process, ensuring the cleanliness of the electrode pieces and eliminating the risk of short circuits.

The core value of this process lies in achieving high precision, high efficiency, and high consistency in the processing of electrode width. Accurate width control is the key to ensuring the alignment of subsequent cell winding or stacking and avoiding internal short circuits; Smooth and burr free edges can effectively improve the safety and self discharge performance of batteries.