CN-121976265-A - Production process for adjusting width of copper foil

Abstract

The application relates to the technical field of electrolytic copper foil manufacturing and discloses a production process for adjusting the width of copper foil, which comprises the steps of pasting a high-temperature-resistant insulating tape after polishing pretreatment is carried out on areas to be shielded on two sides of a cathode roller, installing a composite shielding structure on an anode plate corresponding to the areas to be shielded, wherein the composite shielding structure comprises a basic insulating layer and a fringe electric field adjusting shielding plate arranged on the basic insulating layer, the shielding plate is provided with a gentle slope structure facing the cathode roller, carrying out a raw foil electrolysis process, and synchronously adjusting subsequent surface treatment equipment. According to the application, the deposition area is accurately controlled at the source of the raw foil, so that flexible adjustment of the production breadth is realized, the material waste caused by slitting is obviously reduced, and the yield is improved. Meanwhile, the gentle slope structure on the anode plate can optimize the electric field distribution of the production edge, effectively inhibit the edge effect and obtain the high-quality copper foil with uniform edge thickness and compact structure.

Inventors

• WANG QIRU
• MA LIN
• Fu Yingliang
• ZHANG YOUJUN

Assignees

• 中城财宏科技(江苏)有限公司

Dates

Publication Date

20260505

Application Date

20260309

Claims (10)

1. 1. The production process for adjusting the width of the copper foil is characterized by comprising the following steps of: s1, polishing pretreatment is carried out on areas to be shielded on two sides of a cathode roller; S2, sticking a high-temperature-resistant insulating tape to the pretreated region to be shielded, wherein the high-temperature-resistant insulating tape has high viscosity at the production working temperature, and the viscosity is reduced at the normal temperature; S3, installing a composite shielding structure on the anode plate corresponding to the to-be-shielded area of the cathode roller, wherein the composite shielding structure comprises a basic insulating layer and a fringe electric field adjusting shielding plate arranged on the basic insulating layer, and the working surface of the fringe electric field adjusting shielding plate facing the cathode roller is provided with a gentle slope structure; s4, performing a foil producing electrolytic process in a foil producing tank containing the cathode roller and the anode plate to produce a copper foil with a target width; S5, synchronously adjusting the electroplating bath in the subsequent surface treatment machine, wherein the adjustment comprises shielding the anode plate in the electroplating bath with a corresponding target width.
2. 2. The process according to claim 1, wherein the polishing in step S1 is performed using fine sandpaper of 800-1200 mesh.
3. 3. The production process for adjusting the width of the copper foil according to claim 1, wherein the thickness of the high-temperature-resistant insulating tape is 0.05-0.15 mm.
4. 4. The process for producing a copper foil with a width adjusted according to claim 1, wherein the base insulating layer is a polyimide-based acid-resistant masking tape.
5. 5. The production process for adjusting the width of the copper foil according to claim 1, wherein the width of the gentle slope structure of the fringe electric field adjusting shielding plate is 10-30 mm, and an included angle between a working face of the gentle slope structure and a main plane of the anode plate is 15-45 degrees.
6. 6. The process for producing a copper foil with a width adjusted according to claim 5, wherein the fringe electric field adjusting shielding plate is made of polytetrafluoroethylene or polyvinyl chloride material.
7. 7. The process according to claim 1, wherein the raw foil electrolysis process in step S4 has parameters of electrolyte temperature of 50-65 ℃ and cathode current density of 40-80A/dm 2.
8. 8. The process for producing a copper foil according to claim 7, wherein the electrolyte used in the raw foil electrolysis process has a copper sulfate concentration of 60 to 90g/L and a sulfuric acid concentration of 90 to 130g/L.
9. 9. The process for producing a copper foil with a controlled width according to claim 8, wherein said electrolyte further comprises chloride ions at a concentration of 10 to 40 ppm.
10. 10. The process according to claim 1, wherein the step S5 of synchronously adjusting the widths of the copper foils further comprises adjusting the physical shielding plates at the sides of the anode plates in the plating bath so that the edges thereof are aligned with the shielding positions on the anode plates.

Description

Production process for adjusting width of copper foil Technical Field The invention relates to the technical field of electrolytic copper foil manufacturing, in particular to a production process for adjusting the width of copper foil. Background The electrolytic copper foil is used as a key base material of a lithium ion battery negative electrode current collector and a printed circuit board, and the production process and quality control of the electrolytic copper foil are vital to downstream industries. In the current commercial process, electrolytic copper foil is typically produced by continuous electrolytic deposition on a cathode roll having a fixed width to form a standard wide roll of copper foil. However, downstream applications often require a wide and narrow range of copper foil of a variety of different gauges, and standard wide range of copper foil must undergo a slitting process to meet these requirements. The slitting process inevitably generates a large amount of scrap, directly causes lower comprehensive utilization rate of raw materials and increases production cost. In order to reduce scrap from the source, the industry has also attempted to use physical shielding to directly define the green foil area of the copper foil. However, simply providing an insulating barrier between the cathode roll and anode plate creates an abrupt electric field change at the boundary of the active production zone and the shielding zone. The abrupt change of the electric field easily causes the phenomenon of excessive concentration of the edge current density, namely edge effect, and further causes the quality defects of thickening, loose structure or burrs and the like of the edge of the produced copper foil, thereby affecting the uniformity and subsequent service performance of the product. Therefore, how to effectively inhibit the edge effect and ensure the product quality while realizing flexible breadth production to improve the material utilization rate is a technical problem to be solved in the field. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a production process for adjusting the width of the copper foil, which solves the problems that the utilization rate of materials is low due to the slitting of standard width products in the existing electrolytic copper foil production technology, and the edge quality defect of the products is caused by the concentration of edge current density when the simple physical shielding is tried to adjust the width. The invention is realized by the following technical scheme that the production process for adjusting the width of the copper foil comprises the following steps: step one, surface pretreatment and shielding of a cathode roller First, the cylindrical surface of the cathode roll is pretreated on both sides to define the area to be screened for production width. The pretreatment is to polish the region to be shielded. The polishing uses fine sand paper of 800-1200 meshes to increase the surface roughness of the area to be shielded, and is used for enhancing the adhesive force of the subsequent shielding material. And then, sticking a high-temperature-resistant insulating tape on the surface of the pretreated area to be shielded. The high-temperature-resistant insulating adhesive tape has the temperature-sensitive viscosity characteristic, namely the viscosity is enough to ensure that the adhesive tape is tightly attached to the surface of a cathode roller at the production working temperature, and the viscosity is reduced at normal temperature so as to be convenient to remove from the surface of the cathode roller and have no colloid residue. The thickness of the high-temperature-resistant insulating tape is 0.05-0.15 mm. Step two, constructing a composite shielding structure of the anode plate And a composite shielding structure is arranged in the raw foil tank at the position of the anode plate corresponding to the region to be shielded of the cathode roller. The composite shielding structure consists of a basic insulating layer and a fringe electric field adjusting shielding plate. First, a basic insulating layer is disposed at a position corresponding to the anode plate. The basic insulating layer is a polyimide substrate acid-resistant shielding adhesive tape. Then, over the base insulating layer, a fringe electric field adjusting shield plate is mounted. The core structure of the fringe electric field adjusting shielding plate is characterized in that the working surface facing the cathode roller is provided with a gentle slope structure. The gentle slope structure enables the distance between the anode plate and the cathode roller to form a smooth transition at the boundary between the effective production area and the area to be shielded, so that a gradient electric field is formed at the boundary area. The gradient electric field has the function of enabling the current density distribution at the edge of th