Description
1. Background and Significance
As the lithium-ion battery industry advances toward higher energy density, electrode fold-and-roll light transmission inspection has become a mandatory front-end checkpoint, critical for controlling brittleness and eliminating safety hazards. Conventional manual inspection suffers from inconsistent parameters, high error margins, low efficiency, and a lack of quantifiable data. By integrating standardized folding and rolling with quantitative visual inspection to replace manual labor, this equipment delivers accurate, uniform testing with end-to-end traceability. It accelerates the automation upgrade of front-end QC, cuts costs, boosts efficiency, and safeguards battery quality at the source.
2. Innovative Solution
Benchmarking standard front-end inspection processes in the lithium-ion battery industry, the FZT2000 simulates mass-production conditions using precision-controlled mechanical folding and constant-pressure rolling to process coated electrodes under specified angles and loads. After unfolding the electrode, a high-definition vision imaging system captures images of the crease zone. Leveraging proprietary image algorithms, the system intelligently identifies and quantitatively analyzes light-transmitting spots along the crease, precisely measuring defect counts, areas, and dimensions. This delivers quantitative data to evaluate coating brittleness, adhesion, and calendering process feasibility, replacing traditional qualitative visual inspection.
3. Analysis Method
The electrode sample is placed into the folding mechanism to undergo folding. A high-precision vision imaging system captures images of the crease area on both the front and back sides, recording the dimensions, area, and count of light-transmitting spots.
The electrode sample is placed into the folding mechanism to undergo folding. A high-precision vision imaging system captures images of the crease area on both the front and back sides, recording the dimensions, area, and count of light-transmitting spots.
4. Advanced Technical Features
Dual-Camera Inspection: Dual cameras inspect light transmission on both the front and reverse sides of the electrode, preventing measurement distortion caused by shed powder obscuring one side.
Dual Testing Modes:
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Cycle Mode: Evaluates the electrode’s light transmission level at a preset number of cycles.
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Light Transmittance Mode: Continuously folds until defect reaches the preset size to determine the electrode’s ultimate brittleness limit.
5. Software UI
Multifunctional Software:
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Real-time display of light-transmission dimensions, area, and count for the electrode sheet.
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Two configurable modes for evaluating electrode brittleness:
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Cycle mode: Set the folding cycle (number of folds) for the test.
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Light-transmission mode: Define a threshold where the measured light-transmission area falls below the actual light-transmission area; the system then determines the transmission cycle (i.e., the cycle count at which the sheet fails the light-transmission criterion).
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Historical data query: When retrieving past records, the system displays all data from the corresponding historical test items.
Applications
1. Evaluation of Electrode Folding Brittleness
Sample Information: Cathode electrode sheets from the same product and the same jelly roll
Conclusion: The results show that the cathode electrode sheets from the same jelly roll exhibited an initial light-transmission cycle of 1.5, demonstrating the high consistency of the testing equipment.
2. Current Collector Foil: Raw Substrate Verification(Incoming QC)
Sample Specification: 5/6 μm ultra-thin Cu foil, test crease length: 15 mm
Test Mode Configuration:
- Fixed-Cycle: Preset folding count → Quantify total defect count and dimensions
- Fixed-Defect: Preset defect threshold → Determine critical folding cycle lifespan
Characterization Capabilities:
Folding Angle & Speed
0–360° | Max 90°/s
0–360° | Max 90°/s
Calendering Load
2 ± 0.1 kg(Customizable)
2 ± 0.1 kg(Customizable)
Single-Pixel Precision
7 μm Resolution
7 μm Resolution
Detectable Pinhole
Min. 13 μm (10 μm detected)
Min. 13 μm (10 μm detected)
Engineering Value: Eliminates sub-surface pinholes and micro-perforations before coating, preventing foil rupture under high roll tension and slurry leakage defects.
3. Coated Electrodes: Cathode & Anode Flexibility(In-Process / IPQC)
Sample Specification: 80–150 μm Graphite Anode / LFP / NCM Cathode, crease length: 40 mm (customizable)
Test Mode Configuration:
- Fixed-Cycle: Preset folding count → Quantify total defect count and dimensions
- Fixed-Defect: Preset defect threshold → Determine critical folding cycle lifespan
Characterization Capabilities:
Folding Angle & Speed
0–360° | Max 90°/s
0–360° | Max 90°/s
Calendering Load
2 ± 0.1 kg(Customizable)
2 ± 0.1 kg(Customizable)
Exposed Metal Foil
≥ 100 μm Delamination
≥ 100 μm Delamination
Coating Crack Width
≥ 50 μm Micro-Cracking
≥ 50 μm Micro-Cracking
Engineering Value: Verifies binder elasticity and calendering density limits, preventing corner cracking and active material peeling during winding/stacking that cause internal micro-shorts.
Specifications
| Model | FZT2000 |
|---|---|
| Sample Thickness Range | 60 ~ 200 μm |
| Sample Size | Head: 35 mm × 65 mm; Tail: 15 mm × 40 mm |
| Sample Test Width Range | 10 ~ 80 mm |
| Samples per Test | 1 piece (Max 70 samples continuous testing) |
| Fold Angle | Forward Fold: 175°; Reverse Fold: 170° (Max 345°) |
| Fold Angular Speed | 90°/s |
| Fold Angle Accuracy | 0.1° |
| Max Calendering Speed | 40 mm/s |
| Calendering Force Range | 0 ~ 20 N |
| Calendering Force Accuracy | 0.1 N |
| Vision Accuracy | 10 μm (Min. Defect Detection Accuracy) |
| Defect Identification Count | 0 ~ 99 per sample |
| Defect Image Storage Capacity | 0 ~ 396 images/sample |
| Test Time | 25 ~ 40 s |
| Sampling Rate | 4 times/cycle |
| Specifications | Equipment Dimensions (W×D×H): 760 mm × 630 mm × 1300 mm Equipment Weight: 110 kg Equipment Power: 500 W |
Download
IEST Electrode Fold & Roll Light Inspection Tester(FZT1000)
