Electrode Slitting in Lithium-Ion Pouch Cell Manufacturing

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Electrode Slitting in Lithium-Ion Pouch Cell Manufacturing

After coating, drying, and calendering, the wide electrode mother roll is converted into narrower daughter rolls through precision slitting. These strips must match the dimensional requirements of the target cell.

Purpose of Electrode Slitting

  • Convert the mother roll into required strip widths
  • Maintain accurate electrode dimensions
  • Produce clean and stable edges
  • Prepare electrodes for winding or stacking

Slitting Process Sequence

  1. The mother roll is loaded into the slitting machine.
  2. Web tension is established and stabilized.
  3. Slitting tools are positioned according to the required width.
  4. The coated electrode is cut into daughter rolls.
  5. Edge quality and width are inspected.
  6. Finished rolls are rewound for assembly.

Critical Process Parameters

  • Slitting width
  • Blade condition
  • Blade overlap and clearance
  • Web tension
  • Line speed
  • Edge quality

Common Slitting Defects

  • Burr formation
  • Jagged or rough edges
  • Width variation
  • Coating chipping
  • Edge cracking
  • Particle generation
Why edge quality matters: Poor slitting can damage the separator during winding or stacking and may increase the risk of internal short circuits.

Impact on Cell Manufacturing

Slitting accuracy directly affects downstream electrode assembly. Stable width and clean edges help maintain alignment, dimensional consistency, and safe separation between electrode layers.

Conclusion

Electrode slitting is a high-precision preparation step. Correct tool setup, stable tension, controlled speed, and continuous edge inspection are essential for producing assembly-ready electrode strips.

#ElectrodeSlitting #BatteryManufacturing #LithiumIonBattery #PouchCell #BatteryEngineering #EVBattery

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