Electrode Sheet Defect Inspection
Electrode sheet defect inspection: for coating defects, scratches, holes, edge material loss and tab dimensions in the coating zone and tab zone of lithium battery cathode/anode sheets, zone-by-zone imaging plus AI judgement outputs OK/NG.
Application Overview
Zoned inspection of the coating area and tab area of lithium battery electrode sheets
Inspects coating defects, scratches, holes, edge material loss and dimensions on lithium battery electrode sheets (coating zone and tab zone); the coating zone and the tab zone are imaged and judged separately.
The electrode sheet is the core material of a lithium battery cell; the uniformity of area density in the coating zone and the dimensions and burr-free condition of the tab zone directly affect battery cell safety and performance. The coating zone and tab zone differ greatly in form and require zone-by-zone inspection.
This station addresses the appearance and dimensions of electrode sheets (positive/negative), focusing on coating defects (thick edges, exposed foil, dark spots), scratches, holes, edge material loss and tab dimensions; acceptance criteria are set zone by zone.
Inspection takes place after the coating / slitting process step, with line-scan imaging on continuously running material. The coating zone and the tab zone use different illumination and algorithms, adjusted according to the electrode sheet type.
inspection Targets
What This Station Actually Has to Judge
| inspection item | Description |
|---|---|
| Coating Defect | Thick edge, bare foil, dark spots, streaks |
| scratch | Surface Scratch |
| hole | Holes, Pinholes |
| Edge Material Loss | Coating Edge Flaking |
| Tab Dimension | Tab length, width, position |
| Tab Burr | Tab cutting burr |
| stain | Oil Stains, Discoloration |
Why Inspect
Problems with manual visual inspection at this step
The coating zone of the electrode sheet is checked for uniform areal density, while the tab zone is checked for dimensions and burrs; the two zones differ in form and risk, so illumination and algorithms must be separate - one set of parameters cannot cover both.
Coating defects and tab burrs both affect battery cell safety, and escapes are costly, so 100% in-line inspection with zone-based records is required.
- The coating zone and the tab zone carry different risks
- Coating defects affect areal density
- Tab burrs affect safety
- Zone-based records required for traceability
How Inspect
Stations and Inspection Chain
- 01 Continuous electrode sheet feed
- 02 Line-scan covers the full area
- 03 Diffused / coaxial light in the coating area
- 04 Telecentric imaging of the tab area
- 05 AI segmentation of coating defects
- 06 Tab dimensions and burr judgement
- 07 OK/NG output
- 08 Interlocking rejection/marking
- 09 Image and data archiving
How to Inspect
Electrode sheets are imaged continuously with line-scan cameras: the coating area uses diffuse/coaxial light to observe areal density variation, and the tab area uses a telecentric lens to measure dimensions and burrs — a zone-based combined imaging method.
inspection defect
| Defect Types | Typical Manifestations | Inspection Focus Points |
|---|---|---|
| Coating Defect | Thick edge, exposed foil, dark spots | Diffused / Coaxial |
| scratch | Linear Scuff | Low-Angle Light |
| hole | Holes, Pinholes | Backlight |
| Edge Material Loss | Coating Edge Short Shot | Segmentation |
| Tab Out of Tolerance | Length, width and position out of tolerance | Telecentric Measurement |
| Tab Burr | Cutting Flash | Low-Angle Light |
| stain | Oil Stains, Discoloration | Diffused Light |
Applicable equipment
Application Industry
Common Question
Why Is Electrode Sheet Inspection Split into a Coating Zone and a Tab Zone?
Can it replace manual labor?
What Inspection Accuracy Can Be Achieved?
How Are Tab Burrs Inspected?
Can Thick Coating Edges Be Detected?
Are results traceable?
Do I Need to Re-Tune When the Electrode Sheet Model Changes?
Submit sample testing
Typical OK/NG electrode sheet samples can be sent for measured testing: the zoned imaging solution for the coating area and tab area is determined according to the electrode sheet type.
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Need to assess imaging conditions, defect criteria and cycle time item by item? Go to the Full Requirement Assessment →
Can This Application Be Done? Sending a Sample for Testing Is the Most Direct Answer
Incoming material, part orientation and cycle time vary widely from factory to factory. Send us real samples and we will run imaging and judgement validation against your production line conditions, then give you a configuration proposal you can actually implement.