Yangjiang Select Copper Foil Manufacturer of Lithium Battery
Calendered copper foil is a product made by repeatedly rolling and annealing high-precision copper strip (usually less than 150 microns in thickness) based on the principle of plastic processing (usually 4-100 microns in thickness and<800 mm in width). Its ductility, bending resistance and conductivity are better than those of electrolytic copper foil, and the copper purity is also higher than that of electrolytic copper foil.
Yangjiang Select Copper Foil Manufacturer of Lithium Battery
Speaking saliva splashes on the surface, and stains will appear when saliva is rolled up. A short time is a dark point, and a long time is a dark point. The size of the point is related to the saliva splashed on the copper foil.
Yangjiang Select Copper Foil Manufacturer of Lithium Battery
Surface passivation: chromate (or chromate and zinc salt) solution is used for surface passivation (i.e. anti oxidation treatment) after the barrier layer is plated to form a complex film with chromium (or chromium zinc) as the main body on the surface, so that the copper foil will not be oxidized and discolored due to direct contact with air, and at the same time, the heat resistance of the copper foil is improved (higher zinc content, better heat resistance), The storage period of copper foil can reach 3 months.
Yangjiang Select Copper Foil Manufacturer of Lithium Battery
The ultra-thin copper foil, represented by mobile phones and laptops, is promoted to thin foil and ultra-thin foil types for portable electronic products, including micro buried, blind hole L multilayer boards, and BGA, CSP and other organic resin packaging substrates. At the same time, COz laser etching also requires the substrate to be extremely thin, so that the copper foil layer can be directly machined with micro wire holes. In Japan, the United States and other countries, electrolytic copper foils of 9 μ m, 5 μ m and 3/- tm can be industrialized. At present, the difficulty or key point of the production technology of ultra-thin copper foil is whether it can be directly produced without carrier, and the product qualification rate is high, as well as the development of new carriers.
Yangjiang Select Copper Foil Manufacturer of Lithium Battery
At the same time of thinning, it is also necessary to improve the tensile strength, elongation and other indicators, otherwise it is easy to cause copper foil fracture, affecting the safety of the battery. Therefore, it is the general trend that the future use will be more light and meet the above indicators.
