What are the requirements for the production of positive and negative electrode materials and processes for 12v 18650 battery pack?

　　Thickness requirements of copper and aluminum foil for 12v 18650 battery pack. With the rapid development of 12v 18650 battery pack in recent years, the current collectors for lithium batteries are also developing rapidly. The positive electrode aluminum foil has been reduced from 16um in previous years to 14um, and then to 12um. Now many lithium battery manufacturers have mass-produced and used 10um aluminum foil, and even used 8um.

　　The negative electrode uses copper foil. Since the copper foil itself has good flexibility, its thickness has been reduced from 12um to 10um, and then to 8um. Currently, most battery manufacturers use 6um for mass production, and some manufacturers are developing 5um/4um. All are possible to use. Since 12v 18650 battery pack have high purity requirements for the copper and aluminum foil used, the density of the material is basically at the same level. As the development thickness decreases, its areal density also decreases accordingly, and the weight of the battery naturally becomes smaller and smaller, which is in line with our requirements for lithium battery requirements.

　　Surface roughness requirements of copper and aluminum foil for lithium batteries For current collectors, in addition to its thickness and weight affecting 12v 18650 battery pack, the surface properties of current collectors also have a greater impact on the production and performance of the battery. Especially for negative electrode current collectors, due to defects in preparation technology, the copper foils on the market are mainly single-sided roughened, double-sided roughened, and double-sided roughened varieties. This asymmetric structure on both sides leads to asymmetric contact resistance of the coatings on both sides of the negative electrode, which in turn prevents the capacity of the negative electrodes on both sides from being released evenly. At the same time, asymmetry on both sides also causes inconsistent bonding strength of the negative electrode coatings, which affects the charge and discharge cycle life of the negative electrode coatings on both sides. Serious imbalance will accelerate the decline of lithium battery capacity. What are the pollution problems in lithium battery production? First, the pollution caused by cleaning the positive and negative electrode pulping equipment and coating equipment during the production process. These two include positive and negative electrode materials, NMP, glue and other substances. Some companies have poor control (malicious speculation and do not want to control), resulting in Toxic wastewater leaked.

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