X-Ray Inspection in Lithium-Ion Pouch Cell Manufacturing

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X-Ray Inspection in Lithium-Ion Pouch Cell Manufacturing

X-ray inspection provides a non-destructive way to examine the internal structure of a lithium-ion pouch cell without opening it. It is used to identify internal conditions that may not be visible from the outside.

Purpose of X-Ray Inspection

  • Verify jelly roll or electrode-stack alignment
  • Check tab positioning and connections
  • Identify internal misalignment or damage
  • Verify structural consistency between cells

Typical Inspection Areas

1. Jelly Roll / Electrode Alignment

X-ray images can reveal shifts, uneven alignment, or deformation within the internal electrode structure.

2. Tab Position

Tab location and connection geometry can be checked to identify abnormal positioning that may affect downstream electrical or assembly performance.

3. Internal Damage

Mechanical deformation, unusual internal geometry, or other abnormalities can be identified without opening the cell.

4. Foreign Particle Detection

Dense foreign particles may be visible in an X-ray image and can indicate a contamination-related risk requiring further investigation.

Impact of Internal Structural Defects

  • Internal short circuits
  • Reduced capacity
  • Uneven current distribution
  • Localized heating
  • Potential safety risks
Key Advantage: X-ray inspection provides visibility into internal cell structure that cannot be confirmed through ordinary external visual inspection.

Role in the Manufacturing Flow

X-ray inspection is positioned after OCV testing and before FQI. It provides an additional structural validation step before final quality approval.

Conclusion

X-ray inspection is an important non-destructive quality-control method for pouch cells. By identifying hidden structural abnormalities before release, it supports safer and more reliable battery manufacturing.

#BatteryManufacturing #XRayInspection #LithiumIonBattery #PouchCell #NDT #BatteryEngineering #EVBattery

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