Battery aluminum foil performance requirements are very strict, if you meet the requirements of several indicators is not difficult, but meet all the requirements is very difficult:
1, melt quality. During the melting process, there will be certain gases, metals and scrap metal inclusions in the melt, which will cause the finished product to have excessive pinholes and holes, and this is also an important reason affecting the quality of the final aluminum foil. In order to ensure the quality of aluminum foil, the purification of the melt is crucial, the key is to carry out the process steps such as degassing, deslagging and filtration, and generally control the hydrogen content index ≤ 0.1ml/100gAL.
| Component Elements Properties | Metric | English | Comments |
| Aluminum, Al | 97.9 – 98.8 % | 97.9 – 98.8 % | As remainder |
| Iron, Fe | 1.2 – 1.7 % | 1.2 – 1.7 % | |
| Silicon, Si | ≤ 0.15 % | ≤ 0.15 % | |
| Copper, Cu | ≤0.05 % | ≤ 0.05 % | |
| Other, each | ≤ 0.05 % | ≤ 0.05 % | |
| Other, total | ≤ 0.15 % | ≤ 0.15 % |
2, plate shape control. Plate shape, also known as tension, is an important indicator of the degree of aluminum foil straightness. In the aluminum processing industry, the use of online plate shape instrument for control, the principle is to use the plate shape instrument to feel the force per unit area on the aluminum foil transverse area, feedback on the degree of tightness of the aluminum foil. Battery manufacturers usually use offline plate tester to check the plate shape, the principle is to use the corresponding tension to pull the aluminum foil flat, and detect the difference between the horizontal position and the sagging amount of the edge of the product, which is called the collapsed edge amount.
