A ray-type copper foil inspection and repair process

Abstract

The invention discloses a repair and correction process of ray type copper foil. The repair and correction process copper foil repair and correction equipment. The copper foil repair and correction equipment comprises a copper foil conveying mechanism, an X-ray defectoscope, a monitor and analysis host connected with the X-ray defectoscope, a laser cutting machine arranged on a copper foil repairtable, a powder spray printer for printing N-mesh copper powder, a static generator adsorbing the copper powder to the copper foil, an anti-static flattening scraper, a rolling mechanism and a collection mechanism, wherein the copper foil conveying mechanism, the X-ray defectoscope, the monitor and analysis host, the laser cutting machine, the powder spray printer, the static generator, the anti-static flattening scraper, the rolling mechanism and the collection mechanism are sequentially arranged. The repair and correction process comprises the following steps that the copper foil is conveyed; the X-ray defectoscope penetrates through the copper foil; defects of the copper foil are calibrated by the monitor and analysis host; the laser cutting machine cuts the defect positions of the copper foil; the powder spray printer blows powder to fill the defect positions of the copper foil; the anti-static flattening scraper carries out flattening; rolling is carried out; and collection is carried out. After repair of the process, the quality of the copper foil is effectively improved, the roughness of the copper foil is controlled, the density of the copper foil is improved, the surface of the copper foil is smooth, uniformity is high, surface defects are small, and the quality of the copper foil is guaranteed.

Description

technical field [0001] The invention relates to the field of copper foil repair, in particular to a ray-type copper foil inspection and repair process. Background technique [0002] At present, most lithium-ion battery manufacturers at home and abroad use electrolytic copper foil as the negative electrode collector of lithium batteries. The tensile strength, elongation, compactness, surface roughness, thickness uniformity and appearance quality of copper foil have a great influence on the manufacturing process of lithium ion battery negative electrode and the electrochemical performance of lithium ion battery. [0003] Due to the performance of lithium battery copper foil, copper foil is required to have the characteristics of less defects, fine grains, good oxidation resistance, good folding resistance, low surface roughness, high tensile strength and high ductility. Therefore, lithium battery copper foil Foil thickness, standard weight, tensile strength, normal temperatur...

AI Technical Summary

Problems solved by technology

[0006] Copper foil in lithium batteries will have a great impact on the performance of lithium batteries: 1. Electrolytic copper foil with a rough surface has poor contact with negative active materials such as graphite, which is prone to shedding of coated active materials, which directly affects battery life; 2. When the tensile strength of the copper foil is high, the copper foil is relatively hard. In the process of rolling the negative electrode containing the graphite active material, the copper foil is not deformed enough to adapt to the surface characteristics of the active material, and the contact performance between the two becomes poor. ; On the contrary, when the tensile strength is low, the dimensional stability and flatness of the electrode will be deteriorated, and the copper foil will be easily broken.

These will lead to a decrease in the yield of negative electrode materials, affecting battery capacity, internal resistance and life; 3. The copper foil of a high-performance lithium battery must have sufficient elongation. If the elongation is low, the copper foil will generate internal stress during the rolling process. Splitting occurs, affecting battery capacity, etc.; 4. The appearance of copper foil used for lithium batteries must be clean and flat, and no streaks, surface depressions, spots, and mechanical strains are allowed, otherwise it will easily lead to a decrease in the adhesion of the copper foil, and the coating will appear. Foil leakage point, the amount of coating on both sides is different; 5. The uniformity of thickness has a direct impact on the coating amount of negative active material

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