8021 H18 Aluminum Foil Specifications for High-Performance Battery Packaging | Mingtai Aluminum
Complete Technical Specifications: 8021 H18 Aluminum Foil for Battery Packaging
For engineers designing rigid, high-stack pouch cells that require maximum dimensional stability, 8021 H18 aluminum foil is the specification of choice. The “H18” temper designation indicates a fully hard work-hardened state, providing the highest strength-to-weight ratio among non-heat-treatable alloys. Below are the comprehensive technical specifications and performance data for Mingtai’s 8021 H18 battery foil.
1. Material & Temper Designation
Alloy: 8021 (Al-Fe-Si series, with precise Mn addition)
Temper: H18 (Fully Hard, work-hardened only)
Equivalent Standards: Complies with ASTM B479, GB/T 3198, and customer-specific automotive (IATF 16949) requirements.
2. Key Mechanical Properties
The H18 temper is defined by its high strength and limited ductility, perfect for applications where the foil must not stretch or deform.
| Property | Typical Value Range | Test Standard | Importance for Battery Packaging |
| Tensile Strength (Rm) | ≥ 180 MPa | ASTM E8 / ISO 6892-1 | Provides structural integrity to resist internal swelling and external puncture. |
| Yield Strength (Rp0.2) | ≥ 170 MPa | ASTM E8 / ISO 6892-1 | High yield point prevents permanent deformation of the pouch under stress. |
| Elongation (A50mm) | ≥ 2 % | ASTM E8 / ISO 6892-1 | Controlled elongation ensures the foil can undergo minor forming without cracking during final pouch sealing. |
| Hardness (HV) | ~ 60 – 75 HV | Indicates resistance to surface abrasion during handling and stacking. |
3. Physical & Dimensional Specifications
Standard Thickness Range: 0.040 mm to 0.150 mm (40µm to 150µm)
Thickness Tolerance: Typically ±5% (Can be customized to ±4% or tighter for critical applications).
Standard Width Range: 100 mm to 1650 mm (Slitting precision: ±0.2 mm).
Coil Characteristics: I.D. 76mm / 152mm, O.D. up to 1200mm. Wound under constant tension for uniform, telescoping-free rolls.
4. Critical Surface & Quality Requirements
For reliable lamination and sealing, surface quality is non-negotiable.
Surface Cleanliness: Oil-free, dry surface. Residual rolling oil < 5 mg/m². Surface Wettability: Dyne level > 50 mN/m to ensure excellent adhesion with CPP/PET laminates.
Defect-Free: Guaranteed free of pinholes, scratches, roll marks, and inclusions per stringent AQL sampling standards.
Flatness: Excellent shape control ensures wrinkle-free processing on high-speed lamination lines.
5. Functional Performance in Battery Cells
Choosing 8021 H18 directly impacts cell performance:
Anti-Swelling: Its high strength effectively counters the internal gas pressure generated during cycling, minimizing pouch deformation.
Barrier Properties: The dense, work-hardened structure enhances the inherent moisture and oxygen barrier of 8021 alloy.
Process Compatibility: Despite its hard temper, our 8021 H18 foil maintains sufficient formability for clean tab sealing and pouch folding without fracture.
6. Mingtai’s Manufacturing Guarantee
Our 8021 H18 foil is produced under an IATF 16949 certified quality system, ensuring:
Lot-to-Lot Consistency: Every batch meets the same high mechanical property standards.
Full Traceability: Documentation for material composition, processing history, and QA results.
Customization: We can fine-tune properties within the H18 range (e.g., slightly higher elongation) to suit your specific die-cutting and forming process.
