Gravure roller mechanism and coating module

Abstract

This invention relates to a gravure roller mechanism, comprising: a roller sleeve with recesses on its outer surface and a hollow interior; and a magnetic field generating device housed within the roller sleeve. The magnetic field generating device includes a microwave generator and magnetic field enhancing elements. The magnetic field enhancing elements are circumferentially arranged outside the microwave generator. The microwave generator emits microwaves towards the circumferential magnetic field enhancing elements, and the microwaves within the magnetic field enhancing elements are reflected to form a magnetic field within the elements. Adjacent magnetic field enhancing elements are bonded together or nearly bonded, causing the magnetic fields within the two enhancing elements to converge and superimpose to form a strong magnetic field. The roller sleeve is located within this strong magnetic field. This invention also relates to a coating module. The magnetic fields formed by the microwaves within adjacent magnetic field enhancing elements superimpose to form a strong magnetic field. This strong magnetic field can ionize the gas on the roller sleeve surface to impart hydrophilicity to the outer surface of the roller sleeve. The magnetic field generating device is housed within the roller sleeve, making the gravure roller mechanism structure more compact.

Description

Technical Field

[0001] This invention relates to the field of battery processing, and in particular to a gravure roller mechanism, and also to a coating module. Background Technology

[0002] In the battery manufacturing process, a coating needs to be applied to the surface of the composite current collector. The coating's main components are a mixture of carbon materials such as conductive graphite, graphene, or carbon nanotubes, and water. Currently, the coating method used is gravure roller coating, where a rotating gravure roller with small pits collects the coating within these pits, and then applies the coating to the composite current collector that has passed over the roller's surface. However, the inventors discovered the following problem when using existing gravure roller coating methods:

[0003] Due to the limitations of gravure rollers, paint easily drips off, making it difficult to achieve uniform adhesion. Specifically, firstly, because of the differences in curvature of the grooves on the gravure roller, if the paint is thin, it is difficult to adhere and be contained within the grooves with smaller curvatures, causing the paint to drip off the roller. Secondly, gravure rollers are exposed to the atmosphere, and dust in the air adheres to them. When paint adheres to the roller, the adhesion between the paint and dust is weak. If the dust increases in weight, it will carry the paint off the roller and drip. These factors result in uneven paint distribution on the gravure roller, leading to uneven coating of the paint onto the composite current collector, which can affect product quality. Summary of the Invention

[0004] Therefore, it is necessary to provide a gravure roller mechanism and coating module to address the problem of paint dripping from the gravure roller.

[0005] In a first aspect, this application provides a gravure roller mechanism, comprising:

[0006] Roller sleeve, the roller sleeve is hollow inside; and

[0007] A magnetic field generating device housed within a roller sleeve;

[0008] The magnetic field generating device includes a microwave generator and at least two magnetic field enhancing elements. The magnetic field enhancing elements are arranged circumferentially outside the microwave generator. The microwave generator emits microwaves toward the circumferential magnetic field enhancing elements. The microwaves in the magnetic field enhancing elements are reflected to form a magnetic field in the magnetic field enhancing elements.

[0009] Adjacent magnetic field enhancement elements are attached or close to each other, so that the magnetic fields in the two magnetic field enhancement elements are combined and superimposed to form a strong magnetic field, and the roller sleeve is located in the strong magnetic field.

[0010] In the gravure roller mechanism described above, the microwaves generated by the microwave generator are trapped in the magnetic field enhancement element. The microwaves in the magnetic field enhancement element are reflected to form a magnetic field. The magnetic fields in the magnetic field enhancement element are superimposed to form a strong magnetic field, so that a strong magnetic field exists on the outer surface of the roller sleeve. The magnetic field generating device is housed inside the gravure roller, which avoids redundant parts and makes the whole structure more compact. Moreover, the roller sleeve covering the magnetic field generating device can better protect the magnetic field generating device.

[0011] In addition, the microwaves trapped inside the magnetic field enhancement element will be reflected, causing a standing wave to form inside the magnetic field enhancement element. The standing wave generates heat through resonance. When the magnetic field enhancement elements approach each other, the magnetic field position shifts, causing the heat inside the magnetic field enhancement element to transfer to the edge. This facilitates the transfer of heat from the magnetic field enhancement element to the roller sleeve, increasing the temperature of the roller sleeve and then transferring the heat to the composite current collector, thereby improving the efficiency of subsequent processing.

[0012] In one embodiment, the diameter of the magnetic field enhancement element is not less than the wavelength of the microwaves generated by the microwave generator.

[0013] In one embodiment, the outer walls of two adjacent magnetic field enhancement elements are arranged tangentially.

[0014] In one embodiment, a rotating cylinder frame is provided between the roller sleeve and the microwave generator, and the magnetic field enhancement element is mounted on the rotating cylinder frame.

[0015] In one embodiment, the microwave generator, rotating cylinder, and roller sleeve are arranged in concentric circles.

[0016] In one embodiment, one end of the rotating cylinder is provided with an interface for connecting the drive unit, and the rotating cylinder is provided with a slide rail for accommodating the magnetic field enhancement element, which can move along the slide rail.

[0017] Driven by the drive unit, the rotating cylinder rotates, and the magnetic field enhancement element moves in the slide rail under the action of centrifugal force, causing adjacent magnetic field enhancement elements to collide and stick together.

[0018] In one embodiment, one end of the roller sleeve is provided with a shaft hole for connecting the drive unit, and the other end of the roller sleeve is provided with a relief hole, through which the interface passes.

[0019] Secondly, this application provides a coating module, including: a gravure roller mechanism, the outer surface of which is located in a strong magnetic field;

[0020] The drive unit is used to drive the gravure roller mechanism to rotate;

[0021] The jetting device located above the gravure roller mechanism sprays non-polymerizable gas toward the outer surface of the gravure roller mechanism. The non-polymerizable gas is ionized by a strong magnetic field and grafted onto the outer surface of the gravure roller mechanism.

[0022] In the coating module described above, the gravure roller mechanism itself generates a magnetic field on its outer surface. This magnetic field ionizes the non-polymerizable gas ejected by the air pump, causing polar groups, free radicals, and other active groups to be grafted onto the outer surface of the gravure roller mechanism. This alters the hydrophilicity of the gravure roller mechanism, thereby increasing its adsorption capacity for the coating and ensuring the uniformity of the coating on its surface. Simultaneously, the air pump sprays airflow onto the surface of the gravure roller mechanism, facilitating the removal of dust adhering to it and thus cleaning the mechanism.

[0023] In one embodiment, the jetting device includes at least two air pumps, with the plurality of air pumps arranged along the axial direction of the gravure roller mechanism.

[0024] In one embodiment, it also includes two frames, with the gravure roller mechanism mounted between the two frames, and a support rod rotatably connected between the frames, with multiple air pumps mounted on the support rod. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of a coating module provided in an embodiment of the present invention;

[0026] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0027] Figure 3 This is a cross-sectional view of a coating module provided in an embodiment of the present invention;

[0028] Figure 4 This is a partial front view of a coating module provided in an embodiment of the present invention;

[0029] Figure 5 This is a three-dimensional structural schematic diagram of a gravure roller mechanism provided in an embodiment of the present invention;

[0030] Figure 6 This is a half-sectional view of a gravure roller mechanism provided in an embodiment of the present invention from a first perspective.

[0031] Figure 7 for Figure 6 A magnified view of a portion of point B in the middle;

[0032] Figure 8 This is a half-sectional view of a gravure roller mechanism provided in an embodiment of the present invention from a second perspective.

[0033] Figure 9 for Figure 8A magnified view of a portion of point C.

[0034] Figure label:

[0035] 11. Jet jet device;

[0036] 111. Air pump; 112. Support rod;

[0037] 1111, Nozzle;

[0038] 12. Roller sleeve;

[0039] 121. First half-roll body; 122. Second half-roll body; 123. First end face; 124. Second end face;

[0040] 1231, Shaft hole;

[0041] 1241. Leaving hole;

[0042] 13. First motor;

[0043] 14. Second motor;

[0044] 15. Magnetic field generating device;

[0045] 151. Microwave generator; 152. Rotating cylinder frame; 153. Magnetic field enhancement element;

[0046] 1521, Speaker port; 1522, Slide rail;

[0047] 16. Rack;

[0048] 161. Side plate; 162. Connecting rod;

[0049] 17. Bushing. Detailed Implementation

[0050] To make the above-mentioned objects, 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. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0051] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] It should be noted that when an element is referred to as being "fixed to" or "set on" 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," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0056] In battery manufacturing, a nano-carbon coating process is required, which involves coating the surface of the composite current collector with a coating material before heating. This coating is formed by mixing carbon materials and a solution, where the carbon materials include conductive graphite, graphene, or carbon nanotubes. The carbon materials in the coating can improve conductivity and enhance the adhesion between the composite current collector and the positive or negative electrode material. Currently, the coating method used is gravure coating. A portion of a gravure roller with small pits rotates into a carbon coating equipment housing containing the coating material. The coating material is carried out of the housing through the pits and then applied to the composite current collector that has passed over the surface of the gravure roller, achieving coating printing on the substrate surface. However, when coating the existing gravure roller, uneven coating distribution occurs due to differences in microstructure or curvature at a microscopic perspective. This results in some areas having insufficient coating material while others have concentrated coating material, or the coating material cannot adhere tightly to the surface of the gravure roller in some areas due to uncleanliness. On the one hand, when the gravure roller rotates, the paint tightly adhering to its surface tends to spill outwards due to centrifugal force. On the other hand, due to the adhesion force on the gravure roller, the paint drips downwards under its own gravity, resulting in uneven paint distribution on the roller. This uneven distribution, in turn, affects the quality of the product as it is coated onto the composite current collector. Furthermore, the spilled paint not only wastes raw materials but also contaminates the coating equipment.

[0057] In some embodiments of this application, reference is made to Figure 1 This application provides a coating module including a gravure roller mechanism, a drive unit, and an air jet device 11. The gravure roller mechanism is located within a strong magnetic field; the drive unit is used to drive the gravure roller mechanism to rotate. The air jet device 11 sprays a non-polymerizable gas toward the outer surface of the gravure roller mechanism. The non-polymerizable gas is ionized by the strong magnetic field, and the plasma is connected in parallel (grafted) onto the outer surface of the gravure roller mechanism.

[0058] In this design, the non-polymerizable gas ejected by the strong magnetic field ionization jet device 11 forms a plasma polymer on the outer surface of the gravure roller mechanism, making the outer surface of the gravure roller mechanism hydrophilic. This improves the gravure roller mechanism's adsorption capacity for liquids, preventing the coating from detaching from the gravure roller mechanism due to centrifugal force and gravity during rotation. It also prevents coating dripping or spillage in localized areas of the gravure roller mechanism, ensuring the uniformity of the coating on the gravure roller mechanism. Furthermore, the jet device 11 sprays gas towards the gravure roller mechanism, blowing away dust adhering to the mechanism, thus cleaning the gravure roller mechanism.

[0059] Specifically, the non-polymerizable gas ejected by the jetting device 11 is ionized by a strong magnetic field to form plasma. The plasma forms new bonds on the surface of the gravure roller mechanism, endowing it with new properties. The principle is that the energy particles in the plasma can undergo a cross-linking reaction with the surface of the gravure roller mechanism, generating polar groups, free radicals, and other active groups. The plasma is highly cross-linked (grafted) onto the gravure roller mechanism. The plasma polymer formed by cross-linking (grafting) on ​​the gravure roller mechanism has a network structure, giving the gravure roller mechanism properties such as hydrophilicity, thermal stability, chemical stability, mechanical strength, membrane permeability, and biocompatibility. The grafted chains are chemically stable, and the copolymerization of plasma and the gravure roller mechanism will make the surface of the gravure roller mechanism hydrophilic.

[0060] And further reference Figure 2 , 4 The coating module also includes two frames 16, each frame including a side plate 161. A gravure roller mechanism and connecting rod 162 are mounted on the side plate 161, such that the gravure roller mechanism is positioned between the two frames 16. A drive unit is located within the frame 16. A support rod 112 is also rotatably connected between the frames 16. The air jet device 11 includes at least two air pumps 111, and multiple air pumps 111 are mounted on the support rod 112. The axial direction of the support rod 112 is parallel to the axial direction of the gravure roller mechanism, such that the multiple air pumps 111 are arranged along the axial direction of the gravure roller mechanism.

[0061] Multiple air pumps 111 spray plasma onto different parts of the gravure roller mechanism to uniformly form a plasma polymer on the roller mechanism. This ensures that the surface of the gravure roller mechanism is hydrophilic, resulting in a more even distribution of the coating and a more secure adhesion during rotation, preventing the coating from easily detaching. Furthermore, the support rod 112 is rotatably connected to the frame 16, and the air pumps 111 mounted on the support rod 112 rotate with it. (Reference) Figure 3The air pump 111 is equipped with a nozzle 1111 that sprays gas towards the gravure roller mechanism. The rotation of the support rod 112 adjusts the spray angle of the nozzle 1111 towards the gravure roller mechanism, ensuring precise spraying of the gas from the air pump 111 onto the mechanism. In this design, the non-polymerizable gas can be any one of He, Ar, O2, CO2, NH3, or H2. Because different types of non-polymerizable gases have different densities, the spray paths of the non-polymerizable gases ejected from the air pump 111 are different. Preferably, the spray angle of the nozzle 1111 can be adjusted to ensure that different non-polymerizable gases are accurately sprayed onto the gravure roller mechanism.

[0062] More specifically, the jetting device 11 is located above the gravure roller mechanism; and the cartridge within the coating equipment is located below the gravure roller mechanism. The lower arc surface of the gravure roller mechanism is located within the cartridge, and the lower arc surface can carry out the coating material within the cartridge. The air pump 111 is directed towards the upper arc surface of the gravure roller mechanism, causing non-polymerizing gas to fall onto the upper arc surface of the gravure roller mechanism. It can be understood that the upper arc surface of the gravure roller mechanism is the semi-arc surface at the top in the vertical direction of the gravure roller mechanism when rotating; while the upper arc surface of the gravure roller mechanism is the semi-arc surface at the bottom in the vertical direction of the gravure roller mechanism when rotating. The upper and lower arc surfaces of the gravure roller mechanism change after rotation. After rotating 180°, the original upper arc surface rotates to the bottom to become the new lower arc surface, and the original lower arc surface rotates to the top to become the new upper arc surface.

[0063] During the transfer of the composite current collector in the coating module, the composite current collector passes from the jetting device 11 onto the gravure roller mechanism. The composite current collector can undergo continuous carbon coating on the gravure roller mechanism. Simultaneously, the jetting device 11 continuously jets gas toward the gravure roller mechanism. Preferably, the jetting device 11 jets gas toward the position tangential between the gravure roller mechanism and the composite current collector, allowing the plasma ionized by the strong magnetic field on the gravure roller mechanism to crosslink with the composite current collector, thereby imparting new properties to the surface of the composite current collector material.

[0064] In some embodiments of this application, the gravure roller mechanism includes a roller sleeve 12 and a magnetic field generating device 15. The outer surface of the roller sleeve 12 is provided with recesses capable of containing paint, and the roller sleeve 12 is hollow inside. The magnetic field generating device 15 is disposed within the hollow space of the roller sleeve 12, and a strong magnetic field for ionizing non-polymerizable gases is formed on the surface of the roller sleeve 12 via the magnetic field generating device 15.

[0065] Specifically, refer to Figure 5 , 6The magnetic field generating device 15 includes a microwave generator 151 and at least two magnetic field enhancing elements 153, which are circumferentially arranged outside the microwave generator 151. The microwaves generated by the microwave generator 151 are trapped within the magnetic field enhancing elements 153. At least one wavelength of microwave trapped within the magnetic field enhancing elements 153 can be reflected at the edge of the magnetic field enhancing elements 153, forming a standing wave inside the magnetic field enhancing elements 153. This standing wave can resonate to form a magnetic field, and the magnetic field strength is stronger closer to the center of the magnetic field enhancing elements 153. When two adjacent magnetic field enhancing elements 153 approach each other to a point of contact or near contact, the magnetic fields within the magnetic field enhancing elements 153 attract and converge. The strongest magnetic field within the magnetic field enhancing elements 153 shifts from the center of the magnetic field enhancing elements 153 to the point where the two magnetic field enhancing elements 153 are contacted, causing the magnetic fields to superimpose and form a strong magnetic field. This strong magnetic field diffuses onto the outer surface of the roller sleeve 12. When a strong magnetic field is used to facilitate the non-polymerizable gas to approach the roller sleeve 12, the non-polymerizable gas first comes into contact with the strong magnetic field and is ionized into plasma. The plasma can then approach the roller sleeve 12 and cross-link onto the surface of the roller sleeve 12.

[0066] It should be noted that in this specific implementation, at least two sets of magnetic field enhancement elements 153 correspond to form the same number of strong magnetic fields. Since the magnetic field enhancement elements 153 are arranged on the outer side of the microwave generator 151, multiple strong magnetic fields are arranged on the outer side of the microwave generator 151, and multiple strong magnetic fields are located at different positions of the roller sleeve 12.

[0067] In this configuration, when two adjacent magnetic field enhancing elements 153 are attached together, their outer walls are tangentially arranged. The approximate attachment of two adjacent magnetic field enhancing elements 153 means that the distance between them is less than one microwave wavelength. When the distance between two adjacent magnetic field enhancing elements 153 is sufficiently close, the magnetic fields within the two elements can interact and attract each other, causing the two magnetic fields to superimpose and increase the magnetic induction intensity, thus forming a strong magnetic field.

[0068] In this design, the magnetic fields within the magnetic field enhancing element 153 can be superimposed to increase the magnetic field strength. The roller sleeve 12, located within the magnetic field, achieves the purpose of ionizing the gas. Since the magnetic field generating device 15 is housed within the roller sleeve 12, it avoids the need for an external magnetic field generating device on the gravure roller structure. This design results in a more compact gravure roller structure, eliminating redundant components and reducing the footprint of the coating module. Furthermore, the roller sleeve 12 surrounds the magnetic field generating device 15, preventing it from being bumped or knocked, thus better protecting the device and extending its service life.

[0069] On the other hand, microwaves are reflected within the magnetic field enhancement element 153, where the magnetic field strength is greatest at the center. Simultaneously, the standing wave within the element can increase heat through resonance. More specifically, the heat within the element 153 is concentrated at the center, resulting in the greatest temperature rise at the center. This principle is similar to that of a microwave oven; the location of temperature rise within the element 153 is related to the location of increased magnetic field strength—the higher the magnetic field strength, the higher the temperature rise. When two magnetic field enhancement elements 153 are attached together, their magnetic fields shift and concentrate at the contact point. Simultaneously, the heat within the element 153 is also concentrated at this contact point, making it easier for heat to diffuse outward from within the element 153, thus increasing the surface temperature of the roller sleeve 12. Since the coating process for the composite current collector requires heating, and raising the composite current collector to the predetermined temperature requires a heating module for a period of time, this process is not ideal. In this solution, the heat on the roller sleeve 12 is transferred to the composite current collector, which can preheat the composite current collector and allow it to rise to the temperature required for the carbon coating process more quickly, thereby improving the carbon coating efficiency.

[0070] It can be understood that the diameter of the magnetic field enhancement element 153 is not less than the wavelength of the microwave generated by the microwave generator 151, so as to trap at least one complete wavelength of microwave within the magnetic field enhancement element 153. In this scheme, since the microwave transmission speed within the magnetic field enhancement element 153 is related to the material of the magnetic field enhancement element 153, specifically, if the microwave transmission speed within the magnetic field enhancement element 153 decreases, the wavelength of the microwave within the magnetic field enhancement element 153 will also shorten. Therefore, the diameter of the magnetic field enhancement element 153 is not limited to being not less than the wavelength of the microwave generated by the microwave generator 151, but only needs to satisfy that the diameter of the magnetic field enhancement element 153 is not less than one wavelength of microwave within the magnetic field enhancement element 153 to achieve the purpose of microwave reflection resonance forming a magnetic field within the magnetic field enhancement element 153.

[0071] Preferably, the diameter of the magnetic field enhancing element 153 is equal to the wavelength of the microwave. Microwaves inside the magnetic field enhancing element 153 are reflected at the edge of the magnetic field enhancing element 153 to form a magnetic field.

[0072] The magnetic field enhancing element 153 and the roller sleeve 12 are made of high-temperature resistant inorganic materials to allow microwaves or magnetic fields to diffuse into them. This allows microwaves to enter the magnetic field enhancing element 153 or a strong magnetic field to pass through the roller sleeve 12, creating a strong magnetic field on its outer surface. Simultaneously, the high-temperature resistant inorganic material ensures the stability of the magnetic field enhancing element 153 and roller sleeve 12 during ionization, preventing damage. Since the ionization of the magnetic field enhancing element 153 and roller sleeve 12 generates a large amount of heat, causing a rapid temperature increase, the magnetic field enhancing element 153 and roller sleeve 12 are made of inorganic materials in this design to prevent the temperature increase from affecting their stability.

[0073] More specifically, the magnetic field enhancing element 153 is roller-shaped, and its length is consistent with that of the microwave generator 151. The microwaves generated in the microwave generator 151 can be transmitted to the magnetic field enhancing elements 153 located around the microwave generator 151. When the circular outer contours of two adjacent magnetic field enhancing elements 153 come into contact, the two magnetic field enhancing elements 153 are tangentially arranged so that the magnetic field enhancing elements 153 contact the tangent point, deflecting the magnetic field in the two magnetic field enhancing elements 153 towards the tangent point, making the two magnetic fields more concentrated so that the strong magnetic field formed after the magnetic fields are superimposed is stronger.

[0074] It is understood that the shape of the magnetic field enhancing element 153 includes, but is not limited to, a roller shape, and the magnetic field enhancing element 153 can also be selected as a spherical shape. If the magnetic field enhancing element 153 is selected as a spherical structure, for example, multiple magnetic field enhancing elements 153 arranged circumferentially on the microwave generator 151 constitute a subset of magnetic field enhancing elements. The number of magnetic field enhancing element subsets is at least two. The magnetic field enhancing element subsets are arranged along the axis of the roller sleeve 12. At the same time, adjacent magnetic field enhancing element subsets need to be separated to avoid the magnetic field enhancing elements 153 in the two magnetic field enhancing element subsets from contacting each other. This allows the magnetic field enhancing elements 153 in each magnetic field enhancing element subset to independently generate a magnetic field superposition effect. Furthermore, through multiple sets of magnetic field enhancing element subsets, it is convenient to form multiple strong magnetic fields, so that different positions of the roller sleeve 12 are located in different strong magnetic fields, thereby making the distribution of strong magnetic fields on the roller sleeve 12 more uniform.

[0075] Furthermore, a rotating cylindrical frame 152 is provided between the roller sleeve 12 and the magnetic field generating device 15, and the magnetic field enhancing element 153 is mounted on the rotating cylindrical frame 152. The rotating cylindrical frame 152 has a cylindrical structure, with the microwave generator 151 disposed inside the hollow interior of the rotating cylindrical frame 152, and the roller sleeve 12 covering the outside of the rotating cylindrical frame 152. Additionally, the rotating cylindrical frame 152 has a mounting position for the magnetic field enhancing element 153, which, by mounting the magnetic field enhancing element 153 in the mounting position, confines the magnetic field enhancing element 153 within the rotating cylindrical frame 152.

[0076] In a preferred embodiment, the magnetic field enhancement element 153 is fixed on the rotating cylinder 152, such that the outer walls of two adjacent magnetic field enhancement elements 153 are tangentially arranged and the two magnetic field enhancement elements 153 are in contact with each other, so as to maximize the single magnetic field formed by resonance between the two magnetic field enhancement elements 153.

[0077] In another preferred embodiment, reference Figure 7 The rotating cylinder 152 is equipped with a slide rail 1522 for housing the magnetic field enhancing element 153, which can move along the slide rail 1522. The drive unit can not only drive the roller sleeve 12 to rotate but also drive the rotating cylinder 152 to rotate. When the drive unit drives the rotating cylinder 152 to rotate, the magnetic field enhancing element 153 slides relative to the rotating cylinder 152 under the influence of centrifugal force, causing the magnetic field enhancing element 153 to continuously swing and collide with each other. During this process, some of the magnetic field enhancing elements 153 gradually move closer together so that the microwaves inside the magnetic field enhancing element 153 resonate.

[0078] Specifically, such as Figure 5 , 6 As shown, the roller sleeve 12 includes two opposing first end faces 123 and second end faces 124. A shaft hole 1231 is provided on the first end face 123, and the output shaft of the drive unit is connected to the shaft hole 1231 to drive the roller sleeve 12 to rotate. At the same time, one end of the rotating drum frame 152 is provided with an interface for connecting the drive unit.

[0079] For example, the microwave generator 151, the rotating cylinder frame 152, and the roller sleeve 12 are arranged concentrically. The microwave generator 151, the rotating cylinder frame 152, and the roller sleeve 12 are fitted together with clearance. Figure 1As shown, the drive unit includes a first motor 13 and a second motor 14, which are respectively housed in two frames 16. The output shaft of the first motor 13 is connected to a shaft hole 1231, and the output shaft of the second motor 14 is connected to an interface, allowing the roller sleeve 12 to rotate relative to the rotating cylinder 152. If the drive unit drives the rotating cylinder 152 and the roller sleeve 12 to move synchronously, the magnetic field strength on the surface of the roller sleeve 12 will remain constant. Since the roller sleeve 12 is used to transport the composite current collector, and the composite current collector is continuously transported forward using the roller sleeve 12, the drive unit needs to drive the roller sleeve 12 to maintain unidirectional rotation to achieve unidirectional transmission. Simultaneously, as the rotating cylinder 152 rotates unidirectionally with the roller sleeve 12, the magnetic field enhancing element 153, under the action of centrifugal force, will eventually tend to remain stationary relative to the rotating cylinder 152, resulting in a constant magnetic field strength between the magnetic field enhancing elements 153, thus maintaining the hydrophilic properties of the roller sleeve 12 surface.

[0080] Understandably, the hydrophilicity of the roller sleeve 12 needs to match the product film material and coating composition on the surface of the composite current collector. Generally, the stronger the magnetic field, the greater the energy of the ionized gas, and the better the hydrophilicity of the roller sleeve 12 surface. However, if the hydrophilicity is too high, the force exerted by the coating on the roller sleeve 12 surface will be too great, making it difficult for the coating to transfer onto the product film and affecting the coating effect. Therefore, the magnetic field strength on the roller sleeve 12 surface needs to be compatible with the product film material and coating composition. For example, when the coating is thinner, a stronger magnetic field is needed on the roller sleeve 12; while when the coating is thicker, only a weaker magnetic field is needed on the roller sleeve 12.

[0081] Therefore, in this scheme, the rotating cylinder 152 is driven by an independent second motor 14 to control the rotation speed and direction of the rotating cylinder 152. This allows the magnetic field enhancing elements 153 to continuously separate and collide during the rotation of the rotating cylinder 152, thereby controlling the magnetic field strength on the roller sleeve 12. At the same time, the magnetic field enhancing elements 153 are subjected to centrifugal force, forming a single magnetic field between them, making the strong magnetic field coverage of the roller sleeve 12 more uniform. The roller sleeve 12 and the rotating cylinder 152 can rotate at different speeds, allowing the same position on the roller sleeve 12 to be covered by different strong magnetic fields. For example, if the rotation speed of the roller sleeve 12 is faster than that of the rotating cylinder 152, a single strong magnetic field can pass through a larger area of ​​the outer surface of the roller sleeve 12, thereby utilizing the strong magnetic field to crosslink plasma over a larger area on the outer surface of the roller sleeve 12. Because the rotation of the rotating cylinder 152 allows the magnetic field enhancing element 153 to be more evenly distributed on the inner wall of the roller sleeve 12 under the action of centrifugal force, the areas covered by each strong magnetic field do not overlap. This expands the ionization area of ​​the strong magnetic field while avoiding the overlap of the ionization areas of each magnetic field, ensuring the uniformity of the cross-linked plasma in the roller sleeve 12 and improving the ionization efficiency of the strong magnetic field.

[0082] Furthermore, if the rotating cylinder 152 does not rotate, the magnetic field enhancing element 153 will converge at the bottom of the rotating cylinder 152 due to its own gravity. This causes the magnetic field on the roller sleeve 12 to be concentrated at the bottom of the roller sleeve 12, resulting in an uneven magnetic field on the roller sleeve 12. In order to improve the hydrophilicity of the composite current collector surface, the magnetic field on the roller sleeve 12 also needs to crosslink the plasma on the surface of the composite current collector on the roller sleeve 12. However, when the magnetic field on the roller sleeve 12 is concentrated at the bottom of the roller sleeve 12, it will affect the efficiency of the magnetic field ionizing the non-polymerized gas, and thus affect the efficiency of plasma crosslinking (grafting) to the composite current collector.

[0083] When the rotating cylinder 152 rotates, the magnetic field enhancement element 153 moves along the slide rail 1522 inside the rotating cylinder 152. Compared to when the rotating cylinder 152 does not rotate, the magnetic field on the roller sleeve 12 is more uniformly distributed, which in turn makes the hydrophilicity of the roller sleeve 12 surface more uniform, thereby increasing the magnetic field strength in the top region of the roller sleeve 12 and increasing the magnetic field ionization efficiency in the top region of the roller sleeve 12, so as to facilitate plasma crosslinking on the surface of the composite current collector.

[0084] For example, the slide rail 1522 inside the rotating cylinder 152 is a closed cavity, and the magnetic field enhancing element 153 is housed within the slide rail 1522. Furthermore, the slide rail 1522 is filled with an inert gas to prevent the gas in the closed cavity from being ionized by the magnetic field within the two adjacent magnetic field enhancing elements 153 when they are in contact. The inert gas filling also prevents ionization damage to the magnetic field enhancing element 153, thus extending the service life of the magnetic field enhancing element 153.

[0085] Furthermore, such as Figure 5 As shown, and refer to Figure 9 The other end of the roller sleeve 12 (i.e., the second end face 124) is provided with a clearance hole 1241, and the interface passes through the clearance hole 1241. Specifically, one end of the rotating drum frame 152 is provided with a flared port 1521 as an interface. The flared port 1521 extends outward from the end face of the rotating drum frame 152 along the axial direction of the rotating drum frame 152, and the flared port 1521 protrudes from the second end face 124. Figure 2As shown, a bushing 17 is provided between the second end face 124 and the second motor 14, connecting the horn port 1521 to the output shaft of the second motor 14 via the bushing 17. For example, the cross-sectional area of ​​the horn port 1521 gradually decreases along its extension direction to facilitate insertion into the bushing 17. Simultaneously, the horn port 1521 is hollow inside. When the roller sleeve 12 and the rotating cylinder 152 rotate, the microwave generator 151, spaced apart from the rotating cylinder 152, remains stationary. The power cord of the microwave generator 151 extends out of the gravure roller structure through the hollow of the horn port 1521, preventing the power cord from tangling due to rotation. It should be noted that the microwave generator 151 is not limited to being connected to an external AC power source via a power cord; it can also be powered by a DC power source such as a battery. The battery is housed within the gravure roller structure, similarly avoiding the problem of tangled wires. A wireless transmitter module and a wireless receiver module can also be configured to power the microwave generator 151 via a battery. The wireless transmitter module sends a work or pause command signal to the wireless receiver module via a medium. The wireless receiver module controls whether the battery supplies power to the microwave generator 151 according to the work or pause command signal, so as to realize the switching of the microwave generator 151.

[0086] In some embodiments of this application, such as Figure 5 As shown, the roller sleeve 12 includes a first half-roller body 121 and a second half-roller body 122. The first half-roller body 121 and the second half-roller body 122 are spliced ​​to form the roller sleeve 12, and the structure of the first half-roller body 121 and the second half-roller body 122 facilitates disassembly and assembly. After the magnetic field generating device 15 is installed into the first half-roller body 121 or the second half-roller body 122, the other half of the roller sleeve 12 is assembled, thereby completing the assembly step of the gravure roller structure, so as to facilitate the disassembly and assembly of the gravure roller structure for maintenance and repair.

[0087] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. 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 all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A gravure roller mechanism, characterized in that, include: A roller sleeve, the roller sleeve being hollow inside, and having pits distributed on its outer surface, and A magnetic field generating device housed within the roller sleeve; The magnetic field generating device includes a microwave generator and at least two magnetic field enhancing elements. The magnetic field enhancing elements are arranged circumferentially outside the microwave generator. The microwave generator emits microwaves toward the circumferential magnetic field enhancing elements. The microwaves in the magnetic field enhancing elements are reflected to form a magnetic field in the magnetic field enhancing elements. Adjacent magnetic field enhancing elements are attached or close to each other, so that the magnetic fields in the two magnetic field enhancing elements are combined to form a strong magnetic field, and the roller sleeve is located in the strong magnetic field. The diameter of the magnetic field enhancement element is not less than the wavelength of the microwaves generated by the microwave generator; The outer walls of two adjacent magnetic field enhancement elements are arranged tangentially. A rotating cylinder frame is also provided between the roller sleeve and the microwave generator, and the magnetic field enhancement element is mounted on the rotating cylinder frame; One end of the rotating cylinder is provided with an interface for connecting the drive unit. The rotating cylinder is provided with a slide rail for accommodating the magnetic field enhancing element, and the magnetic field enhancing element can move along the slide rail. Driven by the drive unit, the rotating cylinder frame rotates, and the magnetic field enhancing element moves within the slide rail under the action of centrifugal force, causing adjacent magnetic field enhancing elements to collide and stick together.

2. The gravure roller mechanism according to claim 1, characterized in that, The microwave generator, the rotating cylinder frame, and the roller sleeve are arranged in concentric circles.

3. The gravure roller mechanism according to claim 1, characterized in that, One end of the roller sleeve is provided with a shaft hole for connecting the drive unit, and the other end of the roller sleeve is provided with a relief hole, through which the interface passes.

4. A coating module, characterized in that, include: The gravure roller mechanism as described in any one of claims 1-3, wherein the outer surface of the gravure roller mechanism is located within a strong magnetic field; A drive unit is used to drive the gravure roller mechanism to rotate; An air jet device located above the gravure roller mechanism sprays non-polymerizable gas toward the outer surface of the gravure roller mechanism. The non-polymerizable gas is ionized by the strong magnetic field and grafted onto the outer surface of the gravure roller mechanism.

5. The coating module according to claim 4, characterized in that, The jetting device includes at least two air pumps, and a plurality of the air pumps are arranged along the axial direction of the gravure roller mechanism.

6. The coating module according to claim 5, characterized in that, It also includes two frames, with the gravure roller mechanism mounted between the two frames. A support rod is rotatably connected between the frames, and multiple air pumps are mounted on the support rod.

Images