Fully automatic winding is the core process of lithium-ion battery cell manufacturing, which refers to the entire process of using high-precision winding equipment to stack positive electrode sheets, separators, and negative electrode sheets in sequence and wind them at high speed into the battery cell body. Its core goal is to achieve efficient, consistent, and non-destructive cell winding, laying the foundation for the excellent performance of batteries.

The standard workflow mainly includes the following steps:

Pole and diaphragm feeding: The winding machine automatically installs the rolled positive electrode, negative electrode, and diaphragm rolls onto the feeding shaft. Separators usually use double roll materials to actively unwind and completely isolate the positive and negative electrodes. Each roll is equipped with a high-precision tension control system to ensure constant tension between the polarizer and diaphragm during the winding process, without stretching or wrinkling.

Automatic correction and winding: During the process of transferring the polarizer and diaphragm to the winding needle, real-time correction is carried out through CCD visual sensors or photoelectric sensors to ensure strict alignment of the edges of each layer of material and prevent internal short circuits caused by misalignment of the polarizer. Subsequently, the material is rapidly and accurately wound into the designed number of turns on the winding needle, forming cylindrical or square cells with tight structure and good interlayer interface.

Termination and bonding: After the winding reaches the predetermined length, the equipment automatically cuts off the pole piece and diaphragm, and fixes the winding endpoint with bonding to prevent the battery cell from loosening. After the needle is pulled away, the robotic arm automatically removes the wound battery cell and transfers it to the next process.

The core value of this process lies in the fully automated production, which ensures extremely high consistency and production efficiency of the battery cells. Accurate tension and correction control avoid pole damage and burrs, improving safety; The tight and neat winding structure ensures high energy density and stable internal impedance, which is a key guarantee for manufacturing high-performance and high reliability batteries.