A copper foil production device and method for producing copper foil by dividing and controlling an anode plate

Abstract

A copper foil green foil device and method for controlling anode plates are provided for regulating the thickness uniformity of copper foil deposited on a cathode roller. The device includes an anode groove, an anode plate assembly, a separate control power supply assembly, a connecting assembly, and a detection unit. The anode groove includes a groove base and an insulating layer. The insulating layer covers the inner side wall, groove bottom, and groove opening edge of the groove base. The anode plate assembly includes a plurality of anode plates. Positioning grooves are arranged on the insulating layer and are spaced along the length direction of the groove base. The anode plates are placed in the positioning grooves, and the upper surfaces of the anode plates are parallel to the axial direction of the cathode roller. The separate control power supply assembly includes a plurality of power supply units. The anode plates are provided with conductive studs on the side facing the groove bottom of the positioning groove. The conductive studs are provided with insulating sealing layers on the side facing the anode plates. The connecting assembly includes a plurality of soft connecting wires. The present application solves the technical problem that the electrolysis field is difficult to control in the prior art, thereby causing uneven thickness of the copper foil and poor surface quality.

Description

Technical Field

[0001] This invention relates to the field of copper foil production equipment technology, specifically a copper foil production device and method with a separately controlled anode plate. Background Technology

[0002] In the production of high-performance special copper foils such as lithium-ion battery copper foil and electronic circuit copper foil, the anode device of the foil production machine, as the core component of electrolytic deposition, directly determines the thickness uniformity, surface quality, and production efficiency of the copper foil through its structural design and power supply method. With the continuous growth in demand for ultra-thin, high-precision copper foil from industries such as new energy vehicles and consumer electronics, higher requirements are being placed on the corrosion resistance, power supply stability, and control precision of the anode device in the foil production machine. Currently, several technical routes have evolved in the industry to achieve efficient and stable copper foil electrolytic deposition: one is to improve the material of the anode tank, using metals such as stainless steel or titanium to enhance structural strength; the second is to add a plastic liner to the inner wall of the anode tank to improve corrosion resistance; and the third is to optimize the power supply method of the anode plate, such as using centralized power supply via busbars or multi-point parallel power supply to improve current distribution. These methods have all promoted the development of foil production machine technology at specific levels.

[0003] In existing technologies, a common power supply architecture is that multiple anode plates share a single power source. This globally unified power supply means that the distribution of the electrolytic field along the length of the anode tank is entirely determined by the physical structure, making dynamic correction impossible based on local fluctuations during actual production. When factors such as electrolyte composition, temperature, and flow rate are spatially uneven, or when there are subtle differences in the surface condition of the cathode roller, the electrolytic field cannot adaptively adjust, leading to variations in the copper foil deposition rate along the lateral direction. This ultimately manifests as uneven copper foil thickness and inconsistent surface roughness. This problem is particularly prominent in the production of ultra-thin copper foil with a thickness of 6μm or less, and has become a key bottleneck restricting product yield improvement. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a copper foil production device and method for separately controlled anode plates, which aims to solve the technical problem in the prior art that the electrolytic field is difficult to control in sections, resulting in uneven copper foil thickness and poor surface quality.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: A copper foil production device for a separately controlled anode plate is disclosed, used to regulate the thickness uniformity of copper foil deposited on a cathode roller. The device includes an anode tank, an anode plate assembly, a separately controlled power supply assembly, a connecting assembly, and a detection unit. The anode tank includes a tank base and an insulating layer. The insulating layer covers the inner wall, bottom, and edge of the tank base. The anode plate assembly includes several anode plates. Several positioning grooves adapted to the anode plates are provided on the insulating layer, and these grooves are spaced apart along the length of the tank base. The anode plates are placed within the positioning grooves, and the cathode roller is located within the anode tank, with the upper surface of the anode plate parallel to the axial direction of the cathode roller. The separately controlled power supply assembly includes several power supply units, each power supply unit corresponding to a single anode plate. The anode plates are electrically connected, and each power supply unit is equipped with a control module. The detection unit is used to detect the copper foil thickness or surface defects in the corresponding area of ​​the anode plate and transmit the detection results to the control module. The control module is used to adjust the current or voltage of the corresponding anode plate individually according to the copper foil thickness detection results or surface defects in the corresponding area of ​​the anode plate to change the deposition rate of the copper foil in that area. A conductive stud is provided on the side of the anode plate facing the bottom of the positioning groove. An insulating sealing layer is provided at one end of the conductive stud facing the anode plate. The connection assembly includes several flexible connecting wires. One end of the flexible connecting wire is connected to the conductive stud, and the other end of the flexible connecting wire is connected to the output terminal of the power supply unit. A sealing gasket is provided at the connection between the conductive stud and the flexible connecting wire.

[0006] Furthermore, the power supply unit is equipped with an information acquisition module and a fault early warning module. The information acquisition module is used to collect current and voltage data at the output terminal of each power supply unit in real time, and the fault early warning module is used to issue an alarm when the current or voltage data exceeds a preset range.

[0007] Furthermore, the detection unit includes an industrial vision inspection system, which is used to identify pinholes, pits, and cracks on the surface of copper foil, and to classify and statistically analyze the defect type, location, size, and density.

[0008] Furthermore, the control module is electrically connected to the information acquisition module and the detection unit. The control module is also used to adopt differentiated adjustment strategies according to the type of surface defect: when the defect is a pinhole, the voltage of the corresponding anode plate is reduced; when the defect is a pit, the current of the corresponding anode plate is increased; when the defect is a crack, both the current and voltage of the corresponding anode plate are reduced. The current adjustment range of the control module is 0A-5000A, the voltage adjustment range of the control module is 0V-10V, and the control accuracy of the control module is ≤±0.2%.

[0009] Furthermore, the flexible connector includes an inner core and a protective layer, the protective layer covering the inner core, the inner core being made of multi-strand tin-plated copper braided cable, the protective layer being made of polytetrafluoroethylene, the cross-sectional area of ​​the flexible connector being 600mm²-700mm², and the length of the flexible connector being 0.6m-1.5m.

[0010] Furthermore, the conductive stud is made of oxygen-free copper, with a diameter of 16mm-24mm and a length of 50mm-80mm. The conductive stud is fixed to the anode plate by argon arc welding, with a welding strength ≥350MPa.

[0011] Furthermore, the insulating layer is made of fluororubber or EPDM rubber, the thickness of the insulating layer is 5mm-10mm, the insulating layer is bonded to the tank base by a high-temperature vulcanization process, and the surface roughness Ra of the insulating layer is ≤0.3μm.

[0012] Furthermore, the surface of the anode plate is coated with a titanium-based coating. The dimensions of each anode plate are 1000mm-2000mm×500mm-800mm×5mm-10mm. The dimensional consistency error of the anode plate is ≤±0.5mm. The spacing between two adjacent anode plates is 0-1mm, and the spacing error is ≤±0.2mm.

[0013] Furthermore, the extension direction of the positioning groove is parallel to the length direction of the groove base, and the axial parallelism error between the surface of the anode plate and the cathode roller is ≤ ±0.2mm.

[0014] A method for producing copper foil, applied to the copper foil producing apparatus for the aforementioned controlled anode plate, the method comprising the following steps: S1. Check the installation and connection status of the insulating layer, the anode plate, the flexible connecting wire and the conductive stud. After confirming that each component is firmly installed and reliably connected, start the power supply unit. S2, inject copper-containing electrolyte into the anode tank, start the foil forming machine to make the cathode roller rotate, and begin copper foil deposition on the surface of the cathode roller. During the copper foil deposition process, the detection unit detects the change in copper foil thickness or surface defects in the corresponding area of ​​the anode plate, and outputs the detection results to the control module. The control module adjusts the current or voltage of the corresponding anode plate individually according to the detection results to change the deposition rate of copper foil in that area. S3. After the copper foil production is completed, the power supply unit is turned off, the electrolyte in the anode tank is drained, the anode tank is cleaned, and all components are inspected and maintained.

[0015] Compared with existing technologies, the advantages of this invention are as follows: The composite structure design of the anode tank ensures mechanical strength with the tank base and achieves corrosion and insulation with an insulating layer, solving the problem of balancing strength and corrosion resistance in traditional anode tanks, effectively extending equipment lifespan and ensuring copper foil purity. The direct connection structure of the conductive studs and flexible connecting wires, along with the double-sealing design, uses an insulating sealing layer to cover the welding points and sealing gaskets to seal the seams, solving the problems of high contact resistance and easy heating and oxidation in traditional busbar connections, significantly improving power supply stability. The independent power supply architecture of several anode plates and matching power supply units, combined with an information acquisition module, detection unit, and control module, enables independent spatial partitioning and control of the electrolytic field, solving the technical problem of uneven copper foil thickness caused by multiple anode plates sharing a single power supply, which makes it difficult to partition and control the electrolytic field. This significantly improves the uniformity of copper foil thickness and surface quality. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Fig. 1 This is a cross-sectional schematic diagram of the copper foil production device for the separately controlled anode plate according to an embodiment of the present invention; Fig. 2 This is a schematic diagram of the connection structure of the anode plate, conductive studs, and flexible connecting wires in the copper foil production device of the separately controlled anode plate according to an embodiment of the present invention.

[0017] Explanation of key component symbols: 1. Anode tank; 11. Tank base; 12. Insulation layer; 2. Anode plate; 21. Positioning slide; 3. Power supply unit; 31. Information acquisition module; 32. Fault early warning module; 33. Control module; 4. Flexible connecting wire; 41. Inner core; 42. Protective layer; 43. Sealing gasket; 44. Conductive stud; 45. Insulating sealing layer; 5. Cathode roller; 6. Detection unit.

[0018] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0019] To make the objectives, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," "up," "down," and similar expressions used herein are for illustrative purposes only and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0021] In this invention, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0022] Please see Figs. 1-2A copper foil production device for a separately controlled anode plate is disclosed, used to regulate the thickness uniformity of copper foil deposited on a cathode roller 5. The device includes an anode tank 1, an anode plate assembly, a separately controlled power supply assembly, a connecting assembly, and a detection unit 6. The anode tank 1 includes a tank base 11 and an insulating layer 12. The insulating layer 12 covers the inner wall, bottom, and edge of the tank base 11. The anode plate assembly includes several anode plates 2. Several positioning grooves 21 adapted to the anode plates 2 are provided on the insulating layer 12, and these positioning grooves 21 are spaced apart along the length of the tank base 11. The anode plates 2 are placed within the positioning grooves 21. The cathode roller 5 is located within the anode tank 1, and the upper surface of the anode plate 2 is parallel to the axial direction of the cathode roller 5. The separately controlled power supply assembly includes several power supply units 3, each power supply unit 3 corresponding to a single anode plate. The anode plate 2 is electrically connected, and each power supply unit 3 is equipped with a control module 33. The detection unit 6 is used to detect the copper foil thickness or surface defects in the corresponding area of ​​the anode plate 2 and transmit the detection results to the control module 33. The control module 33 is used to adjust the current or voltage of the corresponding anode plate 2 individually according to the copper foil thickness detection results or surface defects in the corresponding area of ​​the anode plate 2 to change the deposition rate of the copper foil in that area. A conductive stud 44 is provided on the side of the anode plate 2 facing the bottom of the positioning groove 21. An insulating sealing layer 45 is provided on one end of the conductive stud 44 facing the anode plate 2. The connection assembly includes several flexible connecting wires 4. One end of the flexible connecting wire 4 is connected to the conductive stud 44, and the other end of the flexible connecting wire 4 is connected to the output end of the power supply unit 3. A sealing gasket 43 is provided at the connection between the conductive stud 44 and the flexible connecting wire 4.

[0023] The power supply unit 3 is equipped with an information acquisition module 31 and a fault early warning module 32. The information acquisition module 31 is used to collect current data and voltage data at the output terminal of each power supply unit 3 in real time. The fault early warning module 32 is used to issue an alarm when the current data or the voltage data exceeds a preset range.

[0024] The detection unit 6 includes an industrial vision inspection system, which is used to identify pinholes, pits, and cracks on the surface of copper foil, and to classify and statistically analyze the defect type, location, size, and density.

[0025] The control module 33 is electrically connected to the information acquisition module 31 and the detection unit 6. The control module 33 is also used to adopt differentiated adjustment strategies according to the type of surface defect: when the defect is a pinhole, the voltage of the corresponding anode plate is reduced; when the defect is a pit, the current of the corresponding anode plate is increased; when the defect is a crack, both the current and voltage of the corresponding anode plate are reduced. The current adjustment range of the control module 33 is 0A-5000A, the voltage adjustment range of the control module 33 is 0V-10V, and the control accuracy of the control module 33 is ≤±0.2%.

[0026] The flexible connector 4 includes an inner core 41 and a protective layer 42. The protective layer 42 covers the inner core 41. The inner core 41 is made of multi-strand tin-plated copper braided cable. The protective layer 42 is made of polytetrafluoroethylene. The cross-sectional area of ​​the flexible connector 4 is 600mm²-700mm². The length of the flexible connector 4 ranges from 0.6m to 1.5m.

[0027] The conductive stud 44 is made of oxygen-free copper, with a diameter of 16mm-24mm and a length of 50mm-80mm. The conductive stud 44 is fixed to the anode plate 2 by argon arc welding, with a welding strength ≥350MPa.

[0028] The insulating layer 12 is made of fluororubber or EPDM rubber, and the thickness of the insulating layer 12 is 5mm-10mm. The insulating layer 12 is bonded to the tank base 11 by a high-temperature vulcanization process, and the surface roughness Ra of the insulating layer 12 is ≤0.3μm.

[0029] The surface of the anode plate 2 is coated with a titanium-based coating. The dimensions of each anode plate 2 are 1000mm-2000mm×500mm-800mm×5mm-10mm. The dimensional consistency error of the anode plate 2 is ≤±0.5mm. The spacing between two adjacent anode plates 2 is 0-1mm, and the error of the spacing is ≤±0.2mm.

[0030] The extension direction of the positioning groove 21 is parallel to the length direction of the groove base 11, and the axial parallelism error between the surface of the anode plate 2 and the cathode roller 5 is ≤ ±0.2mm.

[0031] A method for producing copper foil, applied to the copper foil producing apparatus for the aforementioned controlled anode plate, the method comprising the following steps: S1. Check the installation and connection status of the insulating layer 12, the anode plate 2, the flexible connecting wire 4 and the conductive stud 44. After confirming that each component is firmly installed and reliably connected, start the power supply unit 3. S2, inject copper-containing electrolyte into the anode tank 1, start the foil forming machine to rotate the cathode roller 5, and begin copper foil deposition on the surface of the cathode roller 5; during the copper foil deposition process, the detection unit 6 detects the change in copper foil thickness or surface defects in the corresponding area of ​​the anode plate 2, and outputs the detection results to the control module 33. The control module 33 adjusts the current or voltage of the corresponding anode plate 2 individually according to the detection results to change the deposition rate of copper foil in that area; S3. After the copper foil production is completed, the power supply unit 3 is turned off, the electrolyte in the anode tank 1 is drained, the anode tank 1 is cleaned, and each component is inspected and maintained.

[0032] Specifically, the working process of the copper foil production device for this sub-controlled anode plate is as follows: Taking the production of lithium-ion battery copper foil with a thickness of 6μm as an example, the diameter of the cathode roller 5 is 2000mm, and the length of the anode groove 1 is 3500mm. It should be noted that in this embodiment, there are eighteen anode plates 2, with a length of 1000mm and a width of 500mm. However, the scope of protection of this invention is not limited to this, and the number of anode plates 2 can be adjusted adaptively according to the specifications of the foil production machine and the width of the copper foil.

[0033] Before starting the foil-making machine, the equipment inspection procedure is performed first. The operator checks whether the insulation layer 12 is intact, whether each anode plate 2 is securely installed in the corresponding positioning groove 21, and whether the connection between the flexible connecting wire 4 and the conductive stud 44 is tight and the sealing gasket 43 is not deformed or damaged. After confirming that everything is correct, the eighteen power supply units 3 are started, and the fault warning module 32 confirms that each power supply unit 3 is working normally through self-check.

[0034] The parameter preset step then begins. Based on the production process requirements of 6μm lithium-ion copper foil, the initial operating parameters of each anode plate 2 are preset via the control module 33 within each power supply unit 3. In this embodiment, the initial current of all eighteen anode plates 2 is set to 1500A, the initial voltage is set to 4.0V, and the initial current difference between adjacent anode plates 2 is 0A, and the initial voltage difference is 0V, ensuring a uniform initial electrolytic field is formed within the anode tank 1.

[0035] After the preset is completed, a copper sulfate electrolyte with a concentration of 90 g / L and a temperature of 50 °C is injected into the anode tank 1. The foil production machine is started so that the cathode roller 5 starts to rotate at a speed of 5 m / min, and the copper foil begins to be electrolytically deposited on the surface of the cathode roller 5.

[0036] During the copper foil deposition process, the information acquisition module 31 collects current and voltage data from the output of each power supply unit 3 at a frequency of 10 times per second in real time, and transmits the collected data to the control module 33 in real time. Simultaneously, the copper foil quality is inspected online by the detection unit 6. Preferably, the detection unit 6 can use an online X-ray thickness gauge to detect the lateral thickness distribution of the copper foil in real time, but it is not limited to this; a laser thickness gauge or other online inspection equipment can also be used. For surface defect detection, the detection unit 6 can use an industrial vision inspection system to identify defects such as pinholes, cracks, and pits in real time. The detection unit 6 is electrically connected to the control module 33 and transmits the detection results to the control module 33.

[0037] When the detection unit 6 detects a thickness deviation in a certain area of ​​the copper foil along the width direction, for example, the area corresponding to the fifth anode plate 2 is found to be 0.3 μm thicker, the control module 33 adjusts the parameters of the power supply unit 3 corresponding to that area based on the detection result of the detection unit 6 and the current data fed back in real time by the information acquisition module 31.

[0038] The following is a quantitative analysis of the relationship between current regulation and deposition rate variation: According to Faraday's law, the copper foil deposition rate is directly proportional to the current density, and the relationship can be expressed as: v=(I×η×M) / (n×F×ρ×S) Where: v is the deposition rate (μm / s), I is the current (A), η is the current efficiency (95%), M is the molar mass of copper (63.5 g / mol), n is the electron transfer number (2), F is the Faraday constant (96500 C / mol), ρ is the copper density (8.96 g / cm³), and S is the area of ​​the cathode roller corresponding to a single anode plate. In this embodiment, S = 1.35 m².

[0039] Substituting the values, we get: v≈I×3.7×10 - ³μm / s That is, the deposition rate generated per ampere current is approximately 0.0037 μm / s.

[0040] The cathode roller rotates at a speed of 5 m / min. The length of a single anode plate is 1000 mm. The time for the copper foil to pass through this area = anode plate length / cathode roller linear speed = 1 m / (5 / 60) m / s = 12 s. Therefore, the increase in deposition thickness produced by a single pass through this area is: Δh = v × 12 ≈ I × 0.0444 μm In this embodiment, the initial current of the fifth anode plate 2 is 1500A, corresponding to a single deposition thickness of approximately 66.6μm. Considering the accumulation over multiple passes, the actual single-pass deposition is approximately 6μm, and the coefficient is already included in the overall efficiency. When the thickness of this region is detected to be 0.3μm too thick, the control module 33 reduces the current from 1500A to 1350A, a reduction of 150A.

[0041] According to the above formula, a 150A reduction in current decreases the deposition rate by approximately 0.555 μm / s, resulting in a reduction of the deposition thickness in a single pass through the region by approximately 6.66 μm. After adjustment, maintaining stable operation of the electrolytic field for 15 minutes and rotating the cathode roller 75 times, the cumulative deposition thickness in this region decreases by approximately 6.66 μm × 75 ≈ 500 μm. Calculated based on a 6 μm deposition per pass, the actual reduction per pass is 0.3 μm, perfectly corresponding to the detected deviation of 0.3 μm.

[0042] After adjustment and continuous monitoring, the thickness of the area recovered to the target range of 6μm±0.1μm within 15 minutes, verifying the precise control effect of current adjustment on the deposition rate.

[0043] For different types of surface defects, the control module 33 adopts differentiated adjustment strategies: When pinhole defects are detected, it indicates that the nucleus formation rate in that area is too low, and the excessively rapid crystal growth leads to a loose structure. The control module 33 reduces the voltage of the anode plate 2 in that area by 0.2V-0.5V, thereby reducing the cathode overpotential, promoting the nucleus formation rate, refining the grains, and reducing pinholes. In this embodiment, if the detection unit 6 detects a surface defect in the area corresponding to the 12th anode plate 2 during production, such as excessive pinhole density, the control module 33 adjusts the voltage of the anode plate 2 in that area from 4.0V to 3.8V, a reduction of 0.2V, based on the defect location. Voltage adjustment affects the overpotential of the cathode surface, and the overpotential is exponentially related to the nucleus formation rate. According to electrochemical theory, appropriately reducing the overpotential can inhibit excessive nucleus growth, promote grain refinement, and thus improve surface quality. After adjustment and stable operation for 15 minutes, a second test showed that the pinhole density in the area decreased from the initial 8 pins / m² to 2 pins / m², and the surface roughness Ra decreased from 0.25 μm to 0.18 μm, verifying the effect of voltage adjustment on improving surface quality.

[0044] When pit defects are detected, it indicates that the local current density in that area is insufficient and the deposition rate is too low. The control module 33 increases the current of the anode plate 2 in that area by 5%-10%, thereby increasing the copper ion reduction rate and making the deposition layer smoother.

[0045] When a crack defect is detected, it indicates that the deposition stress in that area is too high or the grains are coarse. The control module 33 reduces the current of the anode plate 2 in that area by 5%-10% and the voltage by 0.2V-0.5V, thereby reducing the deposition rate and refining the grains to eliminate the risk of cracking.

[0046] After this batch of copper foil is wound, the eighteen power supply units 3 are shut down to stop the power supply. Then, the electrolyte in the anode tank 1 is drained, and the inside of the anode tank 1 is thoroughly cleaned with deionized water. After cleaning, the surface of the insulation layer 12 is checked for signs of wear or corrosion, the coating condition of each anode plate 2 is checked, and the sealing condition of each connection is checked. After confirming that all components are in good condition, it is ready for the next production run.

[0047] Through the aforementioned zoned control mechanism, during an 8-hour continuous production test, the transverse thickness difference of the copper foil was controlled within ±0.3μm, the pit depth ≤0.5μm, the crack length ≤0.1mm, the surface roughness Ra ≤0.18μm, and the pinhole density ≤3 / m². In this embodiment, by embedding the anode plate 2 into the positioning groove 21 of the insulating layer 12 to ensure the consistency of the electrode spacing and the stability of the working surface electric field, and by using eighteen power supply units 3 in conjunction with the information acquisition module 31, the detection unit 6, and the control module 33 to independently control the electrolytic field in zones, this embodiment achieves precise control of the copper foil thickness uniformity and surface quality, effectively solving the technical problems of uneven copper foil thickness and poor surface quality caused by the difficulty in zoned control of the electrolytic field.

[0048] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A copper foil production device for a separately controlled anode plate, used to regulate the uniformity of copper foil thickness deposited on a cathode roller, characterized in that, The copper foil production device for the separately controlled anode plate includes an anode tank, an anode plate assembly, a separately controlled power supply assembly, a connecting assembly, and a detection unit. The anode tank includes a tank base and an insulating layer. The insulating layer covers the inner wall, bottom, and edge of the tank base. The anode plate assembly includes several anode plates. Several positioning grooves adapted to the anode plates are provided on the insulating layer, and these positioning grooves are spaced apart along the length of the tank base. The anode plates are placed within the positioning grooves, and the cathode roller is located within the anode tank. The upper surface of the anode plate is parallel to the axial direction of the cathode roller. The separately controlled power supply assembly includes several power supply units, each power supply unit being electrically connected to one of the anode plates. The unit includes a control module. The detection unit is used to detect the copper foil thickness or surface defects in the corresponding area of ​​the anode plate and transmit the detection results to the control module. The control module is used to adjust the current or voltage of the corresponding anode plate individually according to the copper foil thickness detection results or surface defects in the corresponding area of ​​the anode plate, so as to change the deposition rate of the copper foil in that area. A conductive stud is provided on the side of the anode plate facing the bottom of the positioning groove. An insulating sealing layer is provided on the end of the conductive stud facing the anode plate. The connection assembly includes several flexible connecting wires. One end of the flexible connecting wire is connected to the conductive stud, and the other end of the flexible connecting wire is connected to the output terminal of the power supply unit. A sealing gasket is provided at the connection between the conductive stud and the flexible connecting wire.

2. The copper foil production device for the separately controlled anode plate according to claim 1, characterized in that, The power supply unit is equipped with an information acquisition module and a fault early warning module. The information acquisition module is used to collect the current data and voltage data of the output terminal of each power supply unit in real time. The fault early warning module is used to issue an alarm when the current data or the voltage data exceeds a preset range.

3. The copper foil production device for the separately controlled anode plate according to claim 2, characterized in that, The detection unit includes an industrial vision inspection system, which is used to identify pinholes, pits, and cracks on the surface of copper foil, and to classify and statistically analyze the defect type, location, size, and density.

4. The copper foil production device for the separately controlled anode plate according to claim 3, characterized in that, The control module is electrically connected to the information acquisition module and the detection unit. The control module is also used to adopt differentiated adjustment strategies according to the type of surface defect: when the defect is a pinhole, the voltage of the corresponding anode plate is reduced; when the defect is a pit, the current of the corresponding anode plate is increased; when the defect is a crack, both the current and voltage of the corresponding anode plate are reduced. The current adjustment range of the control module is 0A-5000A, the voltage adjustment range of the control module is 0V-10V, and the control accuracy of the control module is ≤±0.2%.

5. The copper foil production device for the separately controlled anode plate according to claim 1, characterized in that, The flexible connector includes an inner core and a protective layer. The protective layer covers the inner core. The inner core is made of multi-strand tin-plated copper braided cable. The protective layer is made of polytetrafluoroethylene. The cross-sectional area of ​​the flexible connector is 600mm²-700mm². The length of the flexible connector ranges from 0.6m to 1.5m.

6. The copper foil production device for the separately controlled anode plate according to claim 1, characterized in that, The conductive stud is made of oxygen-free copper, with a diameter of 16mm-24mm and a length of 50mm-80mm. The conductive stud is fixed to the anode plate by argon arc welding, with a welding strength ≥350MPa.

7. The copper foil production device for the separately controlled anode plate according to claim 1, characterized in that, The insulating layer is made of fluororubber or EPDM rubber, and its thickness is 5mm-10mm. The insulating layer is bonded to the tank base by a high-temperature vulcanization process, and the surface roughness Ra of the insulating layer is ≤0.3μm.

8. The copper foil generating device for the separately controlled anode plate according to claim 1, characterized in that, The surface of the anode plate is coated with a titanium-based coating. The dimensions of each anode plate are 1000mm-2000mm×500mm-800mm×5mm-10mm. The dimensional consistency error of the anode plate is ≤±0.5mm. The spacing between two adjacent anode plates is 0-1mm, and the spacing error is ≤±0.2mm.

9. The copper foil production device for the separately controlled anode plate according to claim 1, characterized in that, The extension direction of the positioning groove is parallel to the length direction of the groove base, and the axial parallelism error between the surface of the anode plate and the cathode roller is ≤ ±0.2mm.

10. A method for producing copper foil, applied to the copper foil producing apparatus for a separately controlled anode plate as described in any one of claims 1-9, characterized in that, The foil-making method includes the following steps: S1. Check the installation and connection status of the insulating layer, the anode plate, the flexible connecting wire and the conductive stud. After confirming that each component is firmly installed and reliably connected, start the power supply unit. S2, inject copper-containing electrolyte into the anode tank, start the foil forming machine to make the cathode roller rotate, and begin copper foil deposition on the surface of the cathode roller. During the copper foil deposition process, the detection unit detects the change in copper foil thickness or surface defects in the corresponding area of ​​the anode plate, and outputs the detection results to the control module. The control module adjusts the current or voltage of the corresponding anode plate individually according to the detection results to change the deposition rate of copper foil in that area. S3. After the copper foil production is completed, the power supply unit is turned off, the electrolyte in the anode tank is drained, the anode tank is cleaned, and all components are inspected and maintained.

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