Automatic coating treatment equipment and method for conductive carbon-coated copper foil

Abstract

The invention relates to the technical field of coatings, in particular to a conductive carbon-coated copper foil automatic coating treatment device and method.The conductive carbon-coated copper foil automatic coating treatment device comprises a bracket and a coating head which is arranged on the top of the bracket and can conduct coating on copper foil, and further comprises a first-stage rough brushing system which comprises a stainless steel brush roller capable of conducting mechanical scraping on the copper foil; the two ends of the stainless steel brush roller are provided with cooling pipelines allowing cooling liquid to circulate, and a cooling assembly is arranged in the stainless steel brush roller. The second-stage fine brushing system comprises a swing plate and a plurality of spherical polishing heads arranged at the bottom of the swing plate, connecting handles are connected to the two ends of the swing plate, and the second-stage fine brushing system further comprises a swing assembly capable of driving the connecting handles to incline so as to drive the swing plate to move; the three-stage polishing and brushing system comprises a polishing roller internally provided with an air cushion seam, a main frame communicating with the polishing roller through a communicating pipe, an air pump capable of providing an air source for the air cushion seam, and a static electricity removing assembly sharing the same air source with the air cushion seam.

Description

Technical Field

[0001] This invention relates to the field of coating technology, specifically to an automated coating processing device and method for conductive carbon-coated copper foil. Background Technology

[0002] With the rapid development of the new energy industry, lithium-ion batteries, as core energy storage devices, face increasingly stringent performance requirements. Conductive carbon-coated copper foil, a key material for the negative electrode current collector in lithium-ion batteries, significantly improves the interfacial bonding between the current collector and the active material by coating the surface of electrolytic copper foil with a conductive carbon layer. This reduces contact resistance, inhibits oxidation and corrosion of the copper foil during charging and discharging, and enhances the battery's rate performance and cycle life. Research shows that the uniformity, microstructure, and interfacial bonding state of the conductive carbon layer with the copper foil directly affect the overall battery performance. When the carbon coating thickness deviation exceeds ±5% or the surface roughness is greater than 0.5 μm, the battery's cycle life decreases by 15%–20%, and the internal resistance increases by 10%–15%.

[0003] Currently, the production of conductive carbon-coated copper foil in the industry mainly employs the following coating processes: comma blade coating, slot extrusion coating, gravure coating, and spray coating. Corresponding automated equipment typically includes an unwinding mechanism, a surface pretreatment unit, a coating unit, a drying and curing system, an online inspection device, and a rewinding mechanism. However, existing technologies and equipment face numerous technical bottlenecks in practical applications: Firstly, in terms of coating uniformity control, existing equipment struggles to achieve nanometer-level precision thickness control. Publicly available patent CN108787201A describes a production equipment for carbon-coated copper foil for lithium batteries, employing a comma-shaped doctor blade coating method. While this method can achieve coating thickness control of 8-12 μm, under high-speed production conditions (linear speed > 50 m / min), the lateral thickness deviation of the coating remains as high as ±8%–10%, with a significant edge effect; the thickness exceeds the standard by 15%–20% within a 20 mm edge area. More seriously, existing equipment cannot detect and control the microstructure within the coating, such as implicit parameters like pore distribution and conductive agent spatial distribution. While these parameters do not affect the macroscopic thickness, they significantly impact the electrochemical performance of the battery.

[0004] Secondly, in terms of the coordinated control of coating and drying, existing technologies generally suffer from the "film effect" problem. When the wet film enters the drying zone, the surface solvent evaporates rapidly, forming a dense "film" that hinders the diffusion of internal solvents, resulting in excessive internal residual solvent content (0.5%) or the formation of internal microporous structures.

[0005] Third, in balancing high-speed production and quality, existing automated equipment struggles to coordinate production efficiency with coating quality. Industry data shows that when production line speeds exceed 60 m / min, the coating pass rate drops by 2-3 percentage points; when speeds exceed 80 m / min, the pass rate plummets by 5-8 percentage points. The root cause lies in the fact that existing equipment employs an "open-loop control + sampling inspection" model, lacking the ability to compensate in real-time for changes in slurry rheological properties, substrate fluctuations, and the impact of environmental parameters. For example, when slurry viscosity fluctuates by 5% due to temperature changes, existing equipment cannot adjust the coating gap in time, resulting in coating thickness fluctuations of 8%-10%.

[0006] In addition, existing equipment has significant shortcomings in terms of energy efficiency, intelligence, and reliability. The thermal efficiency of drying systems is generally below 45%, resulting in serious energy waste; the equipment lacks full life-cycle data tracking capabilities, making it difficult to achieve correlation analysis between process parameters and product performance; wear detection of key components (such as coating heads and guide rollers) is insufficient, and the equipment accuracy decreases non-linearly over time, typically decreasing by 30%–40% after 500 hours of operation.

[0007] As power batteries develop towards higher energy density, faster charging performance, and longer cycle life, the quality requirements for conductive carbon-coated copper foil are becoming increasingly stringent: coating thickness deviation must be controlled within ±3%, surface roughness Ra≤0.3μm, internal stress<5MPa, lateral thickness difference<0.2μm, and the uniformity of microstructure must be ensured. Traditional coating equipment can no longer meet these technical requirements, and the industry urgently needs a new type of automated coating processing equipment that integrates high-precision control, microstructure optimization, and intelligent adaptive adjustment.

[0008] For example, patent document CN113814112B relates to an automated coating equipment for conductive carbon-coated copper foil, including an operating table, a feeding mechanism, a diversion mechanism, a stirring mechanism, and a grinding mechanism. The feeding mechanism is installed on the operating table, the diversion mechanism is installed in the middle of the operating table, the grinding mechanism is installed at the top of the diversion mechanism, and the stirring mechanism is installed at the bottom of the grinding mechanism. This patent document can solve the following problems in the process of coating carbon slurry onto the surface of copper foil: First, currently, it is generally necessary to manually grind the raw materials and then stir them. Manual grinding and stirring are uneven, which reduces the coating quality of carbon-coated copper foil. Second, it is necessary to manually use a brush to apply the evenly stirred carbon slurry to the surface of copper foil. Manual coating is inefficient, and the manual coating of carbon slurry is uneven, affecting the subsequent use of carbon-coated copper foil.

[0009] Existing technologies utilize a shunt plate to distribute the carbon coating slurry evenly on the copper foil surface, followed by mechanical smoothing with a rotary smoothing brush, which does improve coating uniformity at the macroscopic level. However, this smoothing mechanism based on rotational motion has inherent limitations: regardless of the brush bristles' fineness and density, the periodic rotational motion inevitably creates microscopic directional textures on the coating surface. These seemingly insignificant surface features actually disrupt the structural continuity of the conductive coating in three-dimensional space, leading to significant anisotropy in the electron transport path at the microscopic scale. When applied to lithium-ion battery negative electrode current collectors, this microstructural inhomogeneity causes local current density imbalances, forming hotspots during high-rate charging and discharging, and accelerating the interface degradation of the electrode material. More importantly, this inherent defect introduced by mechanical brushing cannot be eliminated through subsequent processes, becoming a hidden factor restricting the long-term cycle stability of the battery and fundamentally hindering the performance breakthrough of high-energy-density, long-life power batteries. Therefore, this application proposes an automated coating equipment and method for conductive carbon-coated copper foil. Summary of the Invention

[0010] The purpose of this invention is to provide an automated coating process for conductive carbon-coated copper foil, and to solve the problems mentioned in the background art.

[0011] To achieve the above objectives, the present invention provides the following technical solution: an automated coating processing device for conductive carbon-coated copper foil, comprising a bracket and a coating head disposed on top thereof for coating the copper foil, and further comprising: A primary coarse brush system includes a stainless steel brush roller capable of mechanically scraping copper foil, with cooling pipes at both ends for coolant to flow through, and a cooling assembly inside the stainless steel brush roller. The two-stage fine brushing system includes a swing plate and multiple spherical polishing heads disposed at the bottom of the swing plate. Both ends of the swing plate are connected to handles, and the system also includes a swing assembly that can drive the handles to tilt and thus move the swing plate. The three-stage polishing system includes a polishing roller with internal air cushion slots, a main frame connected to the polishing roller via a connecting pipe, an air pump that provides air to the air cushion slots, and an antistatic component that shares the same air source as the air cushion slots.

[0012] Preferably, the cooling assembly includes perforations at both ends of the stainless steel brush roller and connected to cooling pipes. A liquid pump is fixedly connected inside the cooling pipes, and a radiator is fixedly connected inside the cooling pipes. The stainless steel brush roller has multiple cooling channels for the flow of coolant inside.

[0013] Preferably, a miniature ultrasonic transducer is fixedly connected inside the stainless steel brush roller, and a support roller for supporting the stainless steel brush roller is rotatably connected to the top of the bracket, the support roller being located at the bottom of the copper foil.

[0014] Preferably, the swing assembly includes a rotating rod rotatably connected inside the main frame, with protruding handles fixedly connected to both ends of the rotating rod, and a pull handle rotatably connected to the bottom of the protruding handle and rotatably connected to the connecting handle.

[0015] Preferably, the top of the swing plate is connected to a plurality of connecting hoses that are fixedly connected to the main frame, and an electric actuator is fixedly connected inside the connecting hose. The output end of the electric actuator is fixedly connected to a piston plate that is adapted to the inside of the connecting hose.

[0016] Preferably, the main frame has an internal cavity that is connected to multiple connecting pipes. An air-blocking plate is fixedly connected inside the cavity, and a connecting plate is fixedly connected to the rotating rod on the outer surface of the cavity.

[0017] Preferably, the antistatic component includes an auxiliary shell connected to the bottom of the connecting pipe, and an ion wind generator rod is fixedly connected inside the auxiliary shell.

[0018] Preferably, the auxiliary shell is provided with a plurality of branch pipes extending into the connecting pipe.

[0019] Preferably, a feed pipe is provided on one side of the coating head, and a coating roller adapted to the coating head is fixedly connected to the top of the bracket.

[0020] This invention also provides an automated coating process for conductive carbon-coated copper foil, comprising the following steps: Compared with the prior art, the beneficial effects of the present invention are: S1: Apply the coating to the surface of the copper foil in the continuous conveyor belt to form a wet coating; S2: The wet coating is sequentially passed through the primary processing unit, the secondary processing unit, and the tertiary processing unit; The coating is subjected to macroscopic scraping and ultrasonic oscillation treatment by the primary processing mechanism. The coating is micro-adjusted by an oscillating motion through the secondary processing mechanism. The coating is non-contact air cushion polished by the three-stage processing mechanism, and the coating surface is destaticated before or at the same time as polishing.

[0021] 1. A significant breakthrough has been achieved in conductive carbon-coated copper foil coating technology through the innovative integration of a stainless steel brush roller with an internal cooling system, a micro ultrasonic transducer, and a support roller. The closed-loop thermal management system, comprised of precisely designed cooling channels and pipes, a radiator, and a liquid pump within the stainless steel brush roller, not only ensures the stability of the equipment during long-term operation but also optimizes the rheological properties and curing kinetics of the slurry through precise temperature control of the coating. Crucially, the synergistic effect of the micro ultrasonic transducer and mechanical rotation overcomes the inherent limitations of traditional single-rotation brushing technology, effectively eliminating the damage to the coating's microstructure caused by periodic brush marks, and enabling the conductive network to form a continuous and uniform electron transport path in three-dimensional space. The precise cooperation between the stainless steel brush roller and the support roller not only provides stable substrate support but also creates a controllable pressure field distribution, ensuring the macroscopic uniformity of the coating thickness.

[0022] 2. A revolutionary breakthrough in conductive carbon-coated copper foil coating technology has been achieved through the innovative integration of a two-stage fine brushing system and a three-stage polishing system. In the two-stage fine brushing system, the dynamic coordination of the oscillating plate and the spherical polishing head, combined with the precise control of the electric actuator and piston plate, results in an unprecedentedly uniform coating distribution at the microscopic scale, eliminating directional defects caused by traditional unidirectional processing. The three-stage polishing system employs a non-contact design between the air cushion seam and the polishing roller. A stable air film generated by an air pump replaces mechanical contact, allowing slurry molecules to naturally rearrange under the guidance of airflow, completely avoiding periodic patterns caused by any physical contact and achieving molecular-level surface perfection. Crucially, the coordinated work of the antistatic component and the main pneumatic system, through the ion flow generated by the ion wind generator, eliminates electrostatic interference during the critical stage of coating formation, preventing particle adsorption and damage to the conductive network. The ingenious design of the rotating rod and connecting plate achieves precise synchronization between the oscillating motion and the air cushion control, creating an energy gradient distribution processing chain between the two-stage fine brushing and the three-stage polishing. This multi-level collaborative mechanism, from mechanical oscillation to air flotation finishing, not only solves the fundamental problem of coating surface uniformity but also optimizes the three-dimensional continuity of the conductive network, enabling the electron transport path to achieve high consistency across the entire current collector surface. This fundamentally improves the charge and discharge efficiency, cycle life, and safety performance of lithium-ion batteries, representing a significant leap in coating technology from passive processing to active molecular regulation. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the structure in this invention where the bracket is removed; Figure 3 This is a partial structural diagram of the copper foil in this invention; Figure 4 This is a schematic diagram of the structure of the stainless steel brush roller, the oscillating plate, and the polishing roller in this invention; Figure 5 This is a schematic cross-sectional view of the stainless steel brush roller of the present invention. Figure 6 This is a schematic cross-sectional view of the main frame in this invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A; Figure 8 This is a schematic cross-sectional view of the stainless steel brush roller in this invention. Figure 9 This is a schematic diagram of the connecting handle in this invention; Figure 10 For the present invention Figure 9 Enlarged schematic diagram of the structure at point B.

[0024] In the diagram: 100, bracket; 101, copper foil; 102, coating head; 103, feed pipe; 104, coating roller; 200, stainless steel brush roller; 201, support roller; 202, cooling pipe; 203, perforation; 204, radiator; 205, liquid pump; 206, miniature ultrasonic transducer; 207, cooling channel; 300, oscillating plate; 301, spherical polishing head; 302. 303. Connecting hose; 304. Electric actuator; 305. Piston plate; 306. Connecting handle; 307. Protruding handle; 408. Pull handle; 409. Polishing roller; 400. Air cushion seam; 401. Auxiliary shell; 402. Ion wind generator; 403. Connecting pipe; 404. Branch pipe; 405. Main frame; 406. Air pump; 407. Cavity; 408. Air baffle; 410. Rotating rod; 411. Connecting plate. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1: Please refer to Figure 1 - Figure 10 The present invention provides a technical solution: an automated coating treatment device for conductive carbon-coated copper foil, including a bracket 100 and a coating head 102 disposed on the top of the bracket for coating copper foil 101. A feed pipe 103 is provided on one side of the coating head 102, and a coating roller 104 adapted to the coating head 102 is fixedly connected to the top of the bracket 100.

[0027] It also includes a primary coarse brush system, comprising a stainless steel brush roller 200 capable of mechanically scraping the copper foil 101. The surface of the brush roller has precisely arranged stainless steel wires of varying hardness, with the wire diameter gradually decreasing from 0.45 mm to 0.25 mm from root to tip, forming a unique mechanical gradient distribution. This design allows the stainless steel brush roller 200 to generate multi-scale shearing action from macro to micro when it contacts the wet film on the surface of the copper foil 101, effectively eliminating surface protrusions and uneven areas with a thickness greater than 30 μm, while avoiding mechanical damage to the substrate copper foil 101. Cooling pipes 202 for coolant flow are provided at both ends of the stainless steel brush roller 200. These cooling pipes 202 are not simply cooling channels but constitute a key part of a closed-loop thermal management system, and cooling components are installed inside the stainless steel brush roller 200. Furthermore, the cooling assembly includes perforations 203 at both ends of the stainless steel brush roller 200 and connected to the cooling pipe 202. A liquid pump 205 is fixedly connected inside the cooling pipe 202, and a radiator 204 is fixedly connected inside the cooling pipe 202. Multiple cooling channels 207 for coolant flow are opened inside the stainless steel brush roller 200. A miniature ultrasonic transducer 206 is fixedly connected inside the stainless steel brush roller 200. A support roller 201 for supporting the stainless steel brush roller 200 is rotatably connected to the top of the bracket 100. The support roller 201 is located at the bottom of the copper foil 101. The stainless steel brush roller 200 and the support roller 201 form a precise pressure fit system. The miniature ultrasonic transducer 206 is made of piezoelectric ceramic composite material, with a working frequency of 28-40kHz and an adjustable amplitude range of 5-50μm. When the stainless steel brush roller 200 rotates at a conventional speed of 500-800 rpm for macroscopic surface treatment, the micro ultrasonic transducer 206 simultaneously excites high-frequency micro-amplitude vibrations, causing the brush bristles to vibrate longitudinally perpendicular to the surface of the copper foil 101. This composite motion mode produces a unique synergistic effect of mechanical and acoustics: mechanical rotation provides macroscopic smoothing force, while ultrasonic vibration disrupts the tension balance of the coating surface at the microscale, promoting the rearrangement of slurry molecules and eliminating microbubbles and microscopic inhomogeneities invisible to the naked eye.

[0028] Specifically, during actual operation, conductive carbon slurry is continuously fed to the coating head 102 through the feed pipe 103. The coating head 102 cooperates with the coating roller 104 to form an initial wet film on the surface of the high-speed traveling copper foil 101. This wet film then enters the primary coarse brush system, first contacting the high-speed rotating stainless steel brush roller 200. At this time, the micro ultrasonic transducer 206 is activated, generating high-frequency vibration; simultaneously, the liquid pump 205 starts, driving the coolant to flow through the radiator 204 for cooling, and then through the cooling pipe 202 and perforation 203 into the cooling channel 207, forming a highly efficient heat exchange cycle.

[0029] The stainless steel brush roller 200 and the idler roller 201 work together to perform macroscopic smoothing and preliminary thickness control of the wet film.

[0030] In summary, a significant breakthrough has been achieved in conductive carbon-coated copper foil coating technology through the innovative integration of the stainless steel brush roller 200 with its internal cooling system, micro ultrasonic transducer 206, and support roller 201. The closed-loop thermal management system, comprised of the precisely designed cooling channels 207 and cooling pipes 202, radiator 204, and liquid pump 205 within the stainless steel brush roller 200, not only ensures the stability of the equipment during long-term operation but also optimizes the rheological properties and curing kinetics of the slurry through precise temperature control of the coating. Crucially, the synergistic effect of the micro ultrasonic transducer 206 and mechanical rotation overcomes the inherent limitations of traditional single-rotation brushing technology, effectively eliminating the damage to the coating's microstructure caused by periodic brush marks, and enabling the conductive network to form a continuous and uniform electron transport path in three-dimensional space. The precise cooperation between the stainless steel brush roller 200 and support roller 201 not only provides stable substrate support but also creates a controllable pressure field distribution, ensuring the macroscopic uniformity of the coating thickness.

[0031] Example 2: Please refer to Figure 1 - Figure 10 The present invention also provides a technical solution, which differs from the technical solution of Embodiment 1 as follows: an automated coating treatment device for conductive carbon-coated copper foil, further comprising a two-stage fine brushing system, which includes a swing plate 300 and a plurality of spherical polishing heads 301 disposed at the bottom of the swing plate 300. Both ends of the swing plate 300 are connected to a connecting handle 305, and a swing assembly is also included that can drive the connecting handle 305 to tilt and thus drive the swing plate 300 to move. This mechanical linkage design accurately converts the rotational motion of the rotating rod 410 into the reciprocating swing of the swing plate 300. The swing amplitude can be steplessly adjusted within a range of ±3°, and the swing frequency covers 2 to 20Hz, perfectly matching the leveling dynamics requirements of different slurries.

[0032] The three-stage polishing system includes a polishing roller 400 with an internal air cushion slit 401, a main frame 406 connected to the polishing roller 400 via a connecting pipe 404, an air pump 407 that provides an air source for the air cushion slit 401, and an antistatic component that shares the same air source as the air cushion slit 401.

[0033] Furthermore, the swing assembly includes a rotating rod 410 rotatably connected inside the main frame 406. Both ends of the rotating rod 410 are fixedly connected to protruding handles 306. The bottom of the protruding handles 306 is rotatably connected to a pull handle 307 rotatably connected to a connecting handle 305. The top of the swing plate 300 is connected to multiple connecting hoses 302 fixedly connected to the main frame 406. An electric actuator 303 is fixedly connected inside the connecting hose 302. The output end of the electric actuator 303 is fixedly connected to a piston plate 304 adapted to the inside of the connecting hose 302. By precisely controlling the extension and retraction stroke of the electric actuator 303, the piston plate 304 generates controllable fluid pressure changes inside the connecting hose 302, thereby achieving micron-level adjustment of the overall height of the swing plate 300. This design allows the contact pressure between the spherical polishing head 301 and the surface of the copper foil 101 to be dynamically adjusted within a reasonable range, adapting to the processing needs of different stages.

[0034] During operation, the spherical polishing head 301 contacts the wet coating on the surface of the copper foil 101 with precisely controlled pressure. Through the reciprocating motion of the oscillating plate 300, the coating is smoothed at a microscale. At the same time, the electric actuator 303 continuously adjusts the position of the piston plate 304, causing the oscillating plate 300 to vibrate slightly up and down. This vibration and oscillation motion are superimposed to form a complex three-dimensional motion trajectory, effectively eliminating non-uniformity at the 10-50μm scale in the coating, while avoiding directional lines caused by unidirectional motion.

[0035] Furthermore, the main frame 406 has a cavity 408 inside, which is connected to multiple connecting pipes 404. An air baffle 409 is fixedly connected inside the cavity 408, and a connecting plate 411 is fixedly connected to the rotating rod 410 on the outer surface of the cavity 408.

[0036] The static elimination component includes an auxiliary shell 402 connected to the bottom of the connecting pipe 404, an ion wind generator 403 fixedly connected inside the auxiliary shell 402, and multiple branch pipes 405 extending into the connecting pipe 404 inside the auxiliary shell 402.

[0037] When the air pump 407 starts, compressed air first fills the cavity 408. When the pressure reaches the set threshold, the connecting plate 411 is pushed, opening the air-blocking channel. The gas flows rapidly through the connecting pipe 404 to the air cushion slit 401. The gas ejected from the air cushion slit 401 forms a stable gas film thickness of 50-100μm between the polishing roller 400 and the copper foil 101. At this time, the polishing roller 400 is precisely suspended above the surface of the copper foil 101, completely avoiding physical contact. This gas film not only provides uniform surface pressure, but also, through precise control of the airflow direction and speed, gently pushes the slurry molecules at the microscopic protrusions of the coating surface into the recessed areas, achieving a molecular-level smoothing effect and completely eliminating the surface textures that are unavoidable in traditional contact polishing.

[0038] During high-speed coating, friction between the copper foil 101 and various rollers generates significant static electricity. The particles attracted by this static electricity can disrupt coating uniformity and even form conductive paths, leading to battery short circuits. This invention innovatively integrates the static elimination component with the pneumatic system of the three-stage polishing system, sharing the same air source to achieve resource optimization and functional synergy. The static elimination component includes an auxiliary shell 402 connected to the bottom of the connecting pipe 404. An ion wind generator 403 is fixedly connected within the auxiliary shell 402. This ion wind generator 403 employs high-frequency alternating current ionization technology, enabling efficient generation of positive and negative ions under low-pressure conditions. Multiple branch pipes 405 extending into the connecting pipe 404 are disposed within the auxiliary shell 402. These branch pipes 405 precisely guide the ion wind to the surface treatment area of ​​the copper foil 101.

[0039] Specifically, multiple spherical polishing heads 301 can compress the coating on the surface of the copper foil 101 to make it evenly distributed. Simultaneously, the electric actuator 303 is continuously operated to adjust the position of the piston plate 304, changing the position of the swing plate 300. This allows the multiple spherical polishing heads 301 to continuously perform slight compression, thus spreading the coating evenly. At the same time, the air pump 407 is turned on to continuously supply air into the cavity 408. The increased gas in the cavity 408 pushes the connecting plate 411 to move, which in turn drives the rotating rod 410 to rotate. Then, the connecting plate 411 passes over the connecting pipe 404, allowing gas to pass through the connecting pipe 404. The gas flows through the air cushion seam 401 and is then discharged and blown onto the surface of the copper foil 101. At this time, the polishing roller 400 does not contact the copper foil 101, so that the gas forms an air film and covers the coating surface. The air film can gently push the slurry molecules at the micro-protrusions to the depressions. When the rotating rod 410 rotates, it will pull the protruding handle 306 to move, thereby driving the pull handle 307 to move. This causes the pull handle 307 to pull the connecting handle 305 to swing, which in turn causes the connecting handle 305 to move the swing plate 300. This causes the swing plate 300 to swing left and right and act on the coating surface of the copper foil 101.

[0040] In summary, the innovative integration of the two-stage fine brushing system and the three-stage polishing system has achieved a revolutionary breakthrough in conductive carbon-coated copper foil coating technology. In the two-stage fine brushing system, the dynamic coordination between the oscillating plate 300 and the spherical polishing head 301, combined with the precise control of the electric actuator 303 and the piston plate 304, enables unprecedented uniform distribution of the coating surface at the microscale, eliminating the directional defects caused by traditional unidirectional processing. The three-stage polishing system employs a non-contact design between the air cushion seam 401 and the polishing roller 400. A stable air film generated by the air pump 407 replaces mechanical contact, allowing slurry molecules to naturally rearrange under the guidance of airflow, completely avoiding periodic patterns caused by any physical contact and achieving molecular-level surface perfection. Crucially, the coordinated operation of the antistatic component and the main pneumatic system, through the ion flow generated by the ion wind generator 403, eliminates electrostatic interference during the critical stage of coating formation, preventing particle adsorption from damaging the conductive network. The ingenious design of the rotating rod 410 and connecting plate 411 achieves precise synchronization between the oscillating motion and the air cushion control, enabling the secondary fine brushing and tertiary polishing to form a processing chain with an energy gradient distribution. This multi-stage synergistic mechanism, from mechanical oscillation to air-float finishing, not only solves the fundamental problem of coating surface uniformity but also optimizes the three-dimensional continuity of the conductive network, ensuring a high degree of consistency in the electron transport path across the entire current collector surface. This fundamentally improves the charge-discharge efficiency, cycle life, and safety performance of lithium-ion batteries, representing a significant leap in coating technology from passive processing to active molecular regulation.

[0041] Example 3: Please refer to Figure 1 - Figure 10 The present invention also provides a technical solution, which differs from the technical solution of Embodiment 1 as follows: an automated coating process for conductive carbon-coated copper foil, comprising the following steps: S1. When in use, the coating material is poured into the coating head 102 from the feed pipe 103, and its operation can perform coating work on the continuously transported copper foil 101. S2. The coated copper foil 101 first passes through the stainless steel brush roller 200 and then through the swing plate 300 and polishing roller 400. Both the stainless steel brush roller 200 and the support roller 201 rotate to squeeze and convey the copper foil 101. The steel brush on the outer surface of the stainless steel brush roller 200 can macroscopically scrape the coating on the surface of the copper foil 101. At the same time, the micro ultrasonic transducer 206 is turned on to make the stainless steel brush roller 200 vibrate longitudinally with high frequency and small amplitude. At the same time, the liquid pump 205 is turned on to drive the coolant in the radiator 204, thereby continuously driving the heat in the stainless steel brush roller 200, so that the micro ultrasonic transducer 206 can operate stably and cool the surface of the stainless steel brush roller 200, thus pre-cooling the coating. S3. Multiple spherical polishing heads 301 can squeeze the coating on the surface of copper foil 101 to make it evenly distributed. At the same time, the electric push rod 303 is continuously operated to adjust the position of the piston plate 304, which can change the position of the swing plate 300, so that multiple spherical polishing heads 301 continuously perform slight squeezing to spread the coating evenly. S4. Simultaneously, the air pump 407 is turned on to continuously supply air into the cavity 408. At this time, the increase in gas in the cavity 408 will push the connecting plate 411 to move, thereby driving the rotating rod 410 to rotate. Then the connecting plate 411 will pass over the connecting pipe 404, allowing the gas to pass through the connecting pipe 404 to the air pad 401. After that, it will be discharged through the air pad 401 and blown onto the surface of the copper foil 101. At this time, the polishing roller 400 does not contact the copper foil 101, so that the gas forms an air film and covers the coating surface. The air film can gently push the slurry molecules at the micro-protrusions to the depressions. When the rotating rod 410 rotates, it will pull the protruding handle 306 to move, thereby driving the pull handle 307 to move. This causes the pull handle 307 to pull the connecting handle 305 to swing, which in turn causes the connecting handle 305 to move the swing plate 300. This causes the swing plate 300 to swing left and right, acting on the coating surface of the copper foil 101.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automated coating process for conductive carbon-coated copper foil, comprising a bracket (100) and a coating head (102) disposed on top thereof for coating copper foil (101), characterized in that, Also includes: A primary coarse brushing system includes a stainless steel brush roller (200) capable of mechanically scraping copper foil (101), with cooling pipes (202) for coolant flow at both ends of the stainless steel brush roller (200), and a cooling assembly inside the stainless steel brush roller (200). The secondary fine brushing system includes a swing plate (300) and a plurality of spherical polishing heads (301) disposed at the bottom of the swing plate (300). Both ends of the swing plate (300) are connected to a connecting handle (305). The system also includes a swing assembly that can drive the connecting handle (305) to tilt and thus drive the swing plate (300) to move. The three-stage polishing system includes a polishing roller (400) with an internal air cushion slit (401), a main frame (406) connected to the polishing roller (400) via a connecting pipe (404), an air pump (407) that provides an air source for the air cushion slit (401), and an antistatic component that shares the same air source as the air cushion slit (401).

2. The automated coating equipment for conductive carbon-coated copper foil according to claim 1, characterized in that: The cooling assembly includes perforations (203) at both ends of the stainless steel brush roller (200) and connected to the cooling pipe (202). A liquid pump (205) is fixedly connected inside the cooling pipe (202), and a radiator (204) is fixedly connected inside the cooling pipe (202). The stainless steel brush roller (200) has multiple cooling channels (207) for coolant to flow through.

3. The automated coating equipment for conductive carbon-coated copper foil according to claim 1, characterized in that: The stainless steel brush roller (200) is internally fixedly connected to a miniature ultrasonic transducer (206), and the top of the bracket (100) is rotatably connected to a support roller (201) for supporting the stainless steel brush roller (200), and the support roller (201) is located at the bottom of the copper foil (101).

4. The automated coating equipment for conductive carbon-coated copper foil according to claim 1, characterized in that: The swing assembly includes a rotating rod (410) rotatably connected inside the main frame (406). Both ends of the rotating rod (410) are fixedly connected to a protruding handle (306). The bottom of the protruding handle (306) is rotatably connected to a pull handle (307) rotatably connected to a connecting handle (305).

5. The automated coating equipment for conductive carbon-coated copper foil according to claim 1, characterized in that: The top of the swing plate (300) is connected to a plurality of connecting hoses (302) that are fixedly connected to the main frame (406). An electric actuator (303) is fixedly connected inside the connecting hose (302). The output end of the electric actuator (303) is fixedly connected to a piston plate (304) that is adapted to the inside of the connecting hose (302).

6. The automated coating equipment for conductive carbon-coated copper foil according to claim 4, characterized in that: The main frame (406) has a cavity (408) inside, which is connected to multiple connecting pipes (404). An air baffle (409) is fixedly connected inside the cavity (408), and a connecting plate (411) is fixedly connected to the outer surface of the rotating rod (410) on the cavity (408).

7. The automated coating equipment for conductive carbon-coated copper foil according to claim 1, characterized in that: The static elimination component includes an auxiliary shell (402) connected to the bottom of the connecting tube (404), and an ion wind generator rod (403) is fixedly connected inside the auxiliary shell (402).

8. The automated coating equipment for conductive carbon-coated copper foil according to claim 7, characterized in that: The auxiliary shell (402) is provided with a plurality of branch pipes (405) extending into the connecting pipe (404).

9. The automated coating equipment for conductive carbon-coated copper foil according to claim 1, characterized in that: A feed pipe (103) is provided on one side of the coating head (102), and a coating roller (104) adapted to the coating head (102) is fixedly connected to the top of the bracket (100).

10. An automated coating process for conductive carbon-coated copper foil, comprising an automated coating process for conductive carbon-coated copper foil according to any one of claims 1-9, characterized in that, Includes the following steps: S1: Apply the coating to the surface of the copper foil (101) of the continuous conveyor belt to form a wet coating; S2: The wet coating is sequentially passed through the primary processing unit, the secondary processing unit, and the tertiary processing unit; The coating is subjected to macroscopic scraping and ultrasonic oscillation treatment by the primary processing mechanism. The coating is micro-adjusted by an oscillating motion through the secondary processing mechanism. The coating is non-contact air cushion polished by the three-stage processing mechanism, and the coating surface is destaticated before or at the same time as polishing.

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