What Is Aluminum Foil for Battery Factory

The aluminum foil for battery usually refers to the the positive electrode foil of lithium-ion batteries. It is best to call this kind of non-modified positive electrode foil with a thickness of about 0.1mm as current collector aluminum foil to distinguish it from other aluminum foils for lithium-ion.

On the one hand, aluminum foil battery is the current collector electrode, and on the other hand, it is the carrier of the positive or negative electrode material of the lithium battery, that is, the lithium battery material should be coated on it.

The positive electrode is composed of a positive electrode current collector, a high temperature tape, a positive electrode matrix and a positive electrode material. The battery foils are about 0.1mm alloy foil such as 1070, 1060, 1235, 1230, 1100, 8011, 1N30, 3003, etc. Among them, 1235, 1070, 1100, and 3003 aluminum foil are most used because of their high strength.

The shell is processed by a thin aluminum plate, which requires high formability and strength, and should have superior pressure resistance, which can inhibit the expansion of the shell caused by repeated charging and discharging.

The seal is welded by laser, so it should have excellent laser weldability. At the same time, there will be no major work hardening during the processing of the anti-riot valve, and it has good formability.

The aluminium foil for battery has very strict requirements for its various technical indicators due to its special conditions of use. Some specific requirements are as follows:

Foreign matter: Lithium batteries must have high safety in use, so surface foreign matter (impurities) should be strictly controlled. A device for inspecting foreign objects must be set up and accurately measured. Foreign matter should be ≤50mg/300,000 m2.

Wettability: Dyne value is a popular name. To be precise, it should be surface tension coefficient. It mainly expresses the size of surface tension, that is, the traction force between two adjacent parts of the liquid surface per unit length. The unit of surface tension is N/m in the SI system, but dyn/cm (dyn/cm) is still commonly used