Aluminum Foil For Battery Board

What is aluminum battery foil?

Battery aluminum foil, also known as lithium-ion battery aluminum foil or positive electrode aluminum foil, is a key component of lithium-ion batteries and an important material used in manufacturing batteries. Aluminum foil for lithium ion battery is usually made from high-purity aluminum alloy through a series of production processes. It is a thin and light metal foil with good electrical conductivity, thermal conductivity and corrosion resistance. Aluminum foil can act as a current collector and provide a conductive surface for the active materials in the battery electrodes, wrapping the positive and negative materials of the battery to isolate, conduct electricity and protect it.

aluminum battery foil

What alloy is suitable for battery foil?

Can you use aluminum foil for batteries? Aluminum-lithium alloy is an alloy material suitable for battery aluminum foil. This alloy combines the advantages of aluminum and lithium and has light weight, high strength and good electrical conductivity, making it very suitable for making battery aluminum foil. In addition, the production process of battery aluminum foil also includes key links such as surface treatment and coating. The treatment methods of these links also have an important impact on the performance and quality of aluminum foil. Therefore, aluminum foil alloy is a very good battery packaging material.

Aluminum foil for battery alloy specification

As one of the important raw materials for battery packaging, aluminum foil also has certain requirements for the model of aluminum foil. Different series of aluminum foil alloys have differences in performance and application.
The aluminum alloy of battery foil needs to meet specific requirements to ensure optimal performance of lithium-ion batteries. These requirements include high electrical conductivity, good mechanical strength, corrosion resistance and appropriate thickness.

Num	Alloy Series	Aluminum Foil Grade	Features
1	1xxx sereis aluminum foil	1050, 1060, 1070, 1100,1235	Aluminum foil 1050 1060 1070 1100 and other commercially pure aluminum with high conductivity are usually used in applications requiring high conductivity and are also well suited for battery aluminum foil.
2	3xxx sereis aluminum foil	3003, 3004, 3104, 3105	Aluminum foil 3000 series contains manganese as the main alloy element and has good corrosion resistance and moderate strength as a battery foil.
3	8xxx sereis aluminum foil	8011, 8021, 8079	8000 series are aluminum alloys specifically designed for foil applications. 8 series aluminum foil has high strength, good formability and excellent corrosion resistance, and can be used for battery aluminum foil that requires high performance.

Battery aluminum foil thickness deviation

Thickness(mm)	Allowable Deviation Of Local Thickness (mm)	Width Range(mm)	Width Tolerance (mm)	Allowable deviation of outer diameter (%)
0.012	±0.0010	200-1200	±1.0	±10
0.014	±0.0010
0.016	±0.0010
0.018	±0.0010
0.020	±0.0010

Aluminum foil for battery mechanical properties

Thickness(mm)	Temper	Tensile Strength	Elongation(%)
0.012-0.018	H18	≥160	≥3
0.020	H18	≥180	≥3.5

Application of aluminum foil in batteries

How to use aluminum foil for batteries? Battery aluminum foil is an important new energy material and is widely used in various battery products such as lithium batteries, nickel metal hydride batteries, and nickel cadmium batteries. Aluminum foil can be used in many places in the battery.

Aluminum foil is used for battery positive and negative isolation layers

Battery aluminum foil is mainly used as an isolation layer between the positive and negative electrodes of the battery to prevent battery short circuit and electrolyte mixing. Aluminum foil has good isolation properties and can effectively isolate the positive and negative electrode materials and prevent current from flowing directly, thereby ensuring the normal operation of the battery.

Aluminum foil is used for the positive and negative conductive layers of batteries

In addition to serving as an isolation layer, battery aluminum foil is also used as a conductive layer for the positive and negative electrodes of the battery. Aluminum foil has excellent conductive properties and can quickly conduct current and improve the charging and discharging efficiency of the battery. The conductive layer of the battery aluminum foil is usually combined with the positive and negative electrode materials by coating or pressing to form a conductive path inside the battery.

Aluminum foil used in battery packaging materials

Battery aluminum foil is also used as battery packaging material to protect and fix the battery. Aluminum foil has good corrosion resistance and sealing properties, which can effectively prevent the battery from contact with the external environment and extend the service life of the battery. At the same time, aluminum foil can also provide a certain mechanical strength and protect the internal structure and components of the battery.

Aluminum foil used in battery packaging materials

Aluminum foil used as battery heat dissipation material

Since aluminum foil has good thermal conductivity, it can also be used as a heat dissipation material for batteries. During the operation of the battery, a certain amount of heat will be generated. If the heat cannot be dissipated in time, the battery temperature will be too high, affecting the battery performance and life. By connecting the aluminum foil to the heat dissipation structure inside the battery, the heat dissipation effect of the battery can be effectively improved and the stable operating temperature of the battery can be maintained.

Chemical composition of battery aluminum foil

Chemical Composition Of Battery Aluminum Foil
Alloy	Si	Fe	Cu	Mn	Mg	Zn	V	Ti	Al
1050	0.40	0.25	0.05	0.05	/	0.05	0.05	0.03	99.5
1235	0.005	0.005	0.05	0.05	/	0.05	0.05	0.03	99.35
3003	0.6	0.7	0.05-0.20	1.0-1.5	/	0.10	/	/	98.6
8011	0.50	0.6-1.0	0.10	0.2-0.9	0.05	0.10	/	0.08	95.8-98.8

Aluminum foil for battery requirements

1. The surface of the aluminum foil is uniform in color, clean, and flat in shape, with no obvious roller marks, pitting, pinholes, or corrosion marks;
2. There are no rolling defects such as creases, spots, bright lines, etc. on the surface of the aluminum foil;
3. There is no color difference on the surface of aluminum foil;
4. There is no oil on the surface, no serious oil smell, and no oil spots visible to the naked eye;
5. Surface tension, dyne pen test shall not be less than 32 dyne;