8021 Aluminum Foil for Soft-Pack Battery Aluminum-Plastic Film
Core Material for Lithium-Ion Battery Encapsulation Soft-pack lithium-ion batteries are widely used in consumer electronics (3C products), electric vehicles, and energy storage systems due to their lightweight, high safety, and flexible design. The aluminum-plastic film, as the key encapsulation material of soft-pack batteries, relies on its middle aluminum layer to block moisture and electrolytes—and **8021 aluminum foil for soft-pack battery aluminum-plastic film** stands out for its excellent deep drawability, high barrier performance, and stable composite properties. Henan Mingtai AL. Co, Ltd. (stock code: 601677), a leading aluminum processor with over 20 years of experience, produces premium 8021 aluminum foil that meets the strict technical requirements of global battery manufacturers.
1. Core Advantages of 8021 Aluminum Foil for Soft-Pack Battery Aluminum-Plastic Film
8021 aluminum foil (an 8-series alloy with iron and silicon as main alloying elements) is tailored to the unique needs of soft-pack battery aluminum-plastic film, offering four critical advantages:
●Superior Deep Drawability for Complex Battery Shapes: Soft-pack batteries require aluminum-plastic film to be deep-drawn into irregular shapes (e.g., thin-walled cavities for 3C product batteries, large-area panels for power batteries). 8021 aluminum foil in O temper has an elongation rate of 13-18% and a cupping value of up to 7.3mm—far higher than ordinary aluminum foils—allowing it to withstand deep drawing (depth ≥5mm) without cracking or wrinkling. Mingtai’s precise annealing process ensures uniform grain structure, ensuring consistent formability across the entire foil roll.
●High Barrier Performance to Protect Battery Stability: The aluminum layer in aluminum-plastic film must block moisture (moisture transmission rate ≤0.1g/(m²·24h)) and prevent electrolyte leakage. 8021 aluminum foil has a dense metallic structure with pinhole density ≤1 piece/m² (diameter ≤0.03mm), effectively isolating external moisture and internal electrolytes. This maintains the battery’s internal dry environment, extending its cycle life to 1000+ times (for power batteries) and preventing swelling caused by moisture intrusion.
●Excellent Composite Adhesion to Avoid Delamination: Aluminum-plastic film is composed of three layers (nylon outer layer, aluminum middle layer, CPP inner layer), and the aluminum foil must bond tightly with adjacent layers. Mingtai’s 8021 aluminum foil has an ultra-clean surface (oil content ≤5mg/m², Ra ≤0.2μm), ensuring strong adhesion with adhesives during lamination. It undergoes 180° peel strength testing with a result ≥3N/15mm, avoiding delamination even under battery charge-discharge cycles or temperature fluctuations (-40°C to 85°C).
●Strong Puncture & Tear Resistance for Safety: During battery assembly and use, aluminum-plastic film may encounter external impacts or internal electrode expansion. 8021 aluminum foil has a tensile strength of 120-160MPa (H19 temper) and excellent puncture resistance (puncture force ≥8N), preventing the aluminum layer from being pierced by burrs or external objects. This reduces the risk of short circuits and electrolyte leakage, aligning with international battery safety standards (e.g., IEC 62133).
2. Key Specifications of Mingtai’s 8021 Aluminum Foil for Soft-Pack Battery Aluminum-Plastic Film
Mingtai Aluminum provides customized 8021 aluminum foil solutions to match different types of soft-pack batteries, with specifications covering the core needs of 3C and power battery markets:
|
Parameter |
3C Product Batteries (e.g., Phones/Laptops) |
Power Batteries (e.g., EVs/Energy Storage) |
|
Thickness Range |
0.03-0.045mm |
0.04-0.08mm |
|
Width Range |
100-1600mm (customizable) |
100-1600mm (customizable) |
|
Temper |
O, H18 |
O, H19 |
|
Elongation Rate |
≥13% |
≥15% |
|
Cupping Value |
≥6.8mm |
≥7.3mm |
|
Moisture Barrier |
≤0.1g/(m²·24h) |
≤0.08g/(m²·24h) |
|
Surface Defect Requirement |
No pinholes, bright spots, or oil stains |
No pinholes, bright spots, or oil stains |
Mingtai’s 8021 aluminum foil complies with international standards such as ASTM B209 and GB/T 3880, and each batch is accompanied by a mill test certificate to ensure traceability and quality consistency.
3.Mingtai Aluminum: Reliable Supplier of 8021 Aluminum Foil for Soft-Pack Battery Aluminum-Plastic Film
Mingtai’s production capabilities and quality control systems make it a trusted partner for global battery and aluminum-plastic film manufacturers:
●Advanced Production Lines for Battery-Grade Foil: Mingtai owns the domestic first “1+4” hot rolling line, CVC 6-roller cold rolling mills, and precision foil rolling machines. These equipments enable ultra-thin rolling (minimum thickness 0.03mm) with a thickness tolerance of ±0.002mm—critical for ensuring uniform barrier performance and composite adhesion. The company also has a dedicated aluminum slag harmless treatment line, realizing environmentally friendly production of 8021 aluminum foil.
●Strict Quality Control for Battery Safety: With 600+ professional technical personnel, Mingtai conducts 100% inspections on 8021 aluminum foil, including:
*Mechanical Testing: Elongation, cupping, and tensile strength tests to verify formability and strength.
*Surface Inspection: Ultrasonic flaw detection and visual inspection to eliminate pinholes and oil stains.
*Barrier Testing: Moisture transmission rate testing to ensure compliance with battery requirements.
*Safety Testing: Heavy metal detection (≤0.25ppm) and corrosion resistance testing to meet food-grade and battery safety standards.
●Efficient Supply & Global Service: Mingtai has 5 production bases and a 6000+ employee team, supporting flexible order fulfillment—from small batches (3 tons) to large-scale orders (2000 tons)—with delivery times as short as 3-30 days. The company provides global logistics services and technical support, helping customers optimize aluminum-plastic film lamination processes.
4. Why 8021 Aluminum Foil Outperforms Alternatives for Soft-Pack Battery Aluminum-Plastic Film
Compared to other common alloys like 8011 and 8079 aluminum foil, 8021 aluminum foil offers unique advantages for soft-pack battery aluminum-plastic film:
●Better Formability Than 8011 Aluminum Foil: 8011 aluminum foil contains manganese and magnesium, providing higher strength but lower elongation (≤10%). 8021 aluminum foil, without these elements, has better deep drawability—ideal for complex battery shapes that require large deformation.
●More Cost-Effective Than 8079 Aluminum Foil: 8079 aluminum foil has similar formability to 8021 but is 15-20% more expensive. For most soft-pack battery applications (excluding extreme high-end scenarios), 8021 aluminum foil delivers the optimal balance of performance and cost.
●Higher Stability Than 1-Series Aluminum Foil: 1-series aluminum foil (e.g., 1235) has poor puncture resistance and is prone to tearing during deep drawing. 8021 aluminum foil’s iron and silicon composition enhances mechanical stability, making it suitable for long-term battery use.
Contact Mingtai for 8021 Aluminum Foil for Soft-Pack Battery Aluminum-Plastic Film
If you need high-quality 8021 aluminum foil for soft-pack battery aluminum-plastic film production, Mingtai Aluminum is your trusted partner. Our technical team can provide customized solutions based on your battery type, capacity, and encapsulation process requirements.
Email: sales@mingtai-al.com
Whatsapp/Wechat: +86-17760728273
Website: www.mingtaialuminum.com
