Leave Us Message Author:Mingtai Aluminum
8021 aluminum foil is a specialized 8xxx series alloy (Al-Fe-Si) designed as the core barrier layer in lithium-ion soft pack battery aluminum-plastic film . It serves as the critical middle layer that prevents moisture ingress and electrolyte leakage, ensuring battery safety and longevity .
Key Applications
Soft pack lithium batteries for electric vehicles (EVs), 3C consumer electronics (smartphones, laptops), and energy storage systems.
Aluminum-plastic film composite structure: nylon outer layer / 8021 aluminum foil middle layer / polypropylene inner layer.
| Property | Advantage for Soft Pack Batteries |
|---|---|
| High elongation (15-26%) | Enables deep drawing into complex battery shapes without cracking |
| Excellent barrier properties | Pinhole density ≤5/m²; blocks moisture and oxygen |
| Good deep drawability | Cupping value ≥7.0mm; withstands ≥5mm drawing depth -- |
| Electrolyte corrosion resistance | Dense oxide layer prevents degradation from LiPF₆ electrolytes - |
| High puncture resistance | Withstands internal electrode expansion and external impacts |
| Parameter | Specification |
|---|---|
| Alloy | 8021 |
| Temper | O |
| Thickness | 0.025 – 0.045 mm (25-45 microns) |
| Thickness tolerance | ±0.002 mm |
| Width | 100 – 1,650 mm (customizable) |
| Tensile strength | 80 – 110 MPa |
| Elongation | 15% – 26% |
| Cupping value | ≥7.0 mm |
| Pinhole density | ≤5 holes/m² |
| Residual oil on surface | ≤2 mg/m² |
| Wetting tension | ≥72 dyn/cm |
| Alloy | Elongation | Key Advantage |
|---|---|---|
| 8021 | 15-26% | Best elongation; ideal for deep drawing - |
| 8079 | 15-20% | Similar performance, higher cost -- |
| 8011 | 12-20% | Lower elongation, less suitable for complex shapes -- |
| 1235 | 8-15% | Poor puncture resistance, prone to tearing |
Hot Sale Products
Aluminum foil for takeout containers Aluminum foil for cosmetic bottle caps Lidding aluminum foil Aluminum foil for sealing gasket Cable Aluminum Foil 6061 aluminum foil Milk Powder Can Lid Aluminum Foil
Solutions
Aluminum foil for vaccine packaging buyer’s checklist Reliable Aluminum Foil for Lithium Battery Packaging How to Choose Aluminum Foil for Medicine Blister Packs How to Get a Fair 8011 Aluminum Foil Price Quote Get Specs & Solutions for Aluminum Semi Rigid Container Foil Aluminum Foil for Cold Chain: Insulation and Barrier Tips Purchasing Food Safe Aluminum Foil Jumbo Rolls? 5 Key Factors for You Top Questions to Ask an Aluminum Foil Supplier
Quick Contact
Copyright © 2022 Mingtai Aluminum All Rights Reserved.
