Lithium-ion battery foil 
 

 

1. Overview

Lithium-ion battery foil is a key material used in the manufacture of lithium-ion batteries. It is usually made of aluminum foil or copper foil and is mainly used as a current collector for the positive and negative electrodes of the battery. Its excellent conductivity, chemical stability and mechanical strength ensure the efficient energy transmission and long-term stability of lithium-ion batteries. With the rapid development of new energy vehicles, energy storage equipment and consumer electronics markets, the demand for high-quality battery foil continues to grow.

 

2. What is lithium-ion battery foil?

Lithium-ion battery foil is an ultra-thin metal foil material, usually made of high-purity aluminum or copper, which is used inside the battery after precision processing. Its main function is to collect and transmit electrons to ensure that the battery operates efficiently during charging and discharging. Aluminum foil is generally used for the positive electrode, while copper foil is used for the negative electrode.

 

3. Main features of lithium-ion battery foil

Excellent conductivity: ensure rapid transmission of electrons inside the battery and improve energy conversion efficiency.

Good corrosion resistance: adapt to the internal chemical environment of the battery, prevent oxidation and corrosion, and increase service life.

Extremely high surface quality requirements: The surface must be free of dark spots, bright spots, black oil lines, pitting and other defects to ensure uniformity of battery coating and improve the overall performance of the battery.

Mechanical strength and toughness: It has a certain strength and can adapt to the battery winding, lamination and other manufacturing processes.

 

4. Tolerance Standards

| Parameters | Deviation Value |

|----------|------------|

| Width Deviation | ±1mm |

| Thickness and Surface Density Deviation | |

| 0.02~0.025mm | Surface Density Deviation ±2g/cm³ |

| 0.016~0.02mm | Surface Density Deviation ±1.8g/cm³ |

| 0.012~0.016mm | Surface Density Deviation ±1.6g/cm³ |

| 0.01~0.012mm | Surface Density Deviation ±1.4g/cm³ |

| 0.01~0.025mm | Thickness Deviation ±4% |

 

5. Commonly Used Alloys

Lithium-ion Battery Aluminum Foil Mainly Uses the Following High-Purity Aluminum Alloys:

1 Series Pure Aluminum Alloys: 1060, 1050, 1145, 1235

- 8 Series Alloys: 8011, 8A21

- 3 series alloy: 3003

- Special alloy: 1N30

These alloys have excellent ductility, conductivity and corrosion resistance, and can meet the needs of different types of batteries.

 

6. Specifications and standards

Lithium-ion battery foil must comply with national and industry standards, including but not limited to:

- GB/T 3190

- GB/T 3199

- GB/T 7999

- GB/T 16865

- GB/T 17432

- GB/T 20975

- GB/T 22638.1

- GB/T 22638.2

- GB/T 22638.4

 

7. Production process

The main processing technology of lithium-ion battery foil is rolling. Through multiple cold rolling and annealing processes, the aluminum foil or copper foil can reach the required thickness, strength and surface quality.

 

8. Application fields

- New energy vehicles: positive current collector of power batteries, improving battery energy density and charging and discharging efficiency.

- Energy storage equipment: providing efficient and stable electron transmission path in energy storage batteries.

- Consumer electronics: batteries used in mobile phones, laptops and other devices to improve endurance and safety.

- Industrial energy storage: suitable for solar and wind energy storage systems to improve energy storage efficiency.

 

9. Why choose Chalco?

- High-quality raw materials: using high-purity aluminum alloy to ensure excellent conductivity and stability.

- Strict quality control: in line with international standards to ensure the high quality of battery foil.

- Advanced production technology: precision rolling and surface treatment technology to ensure stable product performance.

- Wide application support: products are suitable for power batteries, energy storage batteries, consumer electronics and other fields.
 

10. FAQ

1. What is the main function of lithium-ion battery foil? 

Mainly used to collect and conduct electrons to improve the energy conversion efficiency of batteries.

2. What is the difference between the role of aluminum foil and copper foil in batteries?

Aluminum foil is mainly used for positive electrodes, and copper foil is mainly used for negative electrodes. Their material selection is based on different electrochemical requirements.

3. How to ensure the quality of battery foil? 

Through strict material selection, advanced production processes and quality testing, its conductivity, corrosion resistance and surface quality are ensured.

4. What is the impact of lithium-ion battery foil on battery performance?

High-quality battery foil can improve battery energy density, cycle life and safety, and directly affect the overall performance of the battery.

5. What are the common battery foil alloys?

Mainly including 1060