Gravure roll mechanism and coating module
The gravure roll mechanism with a magnetic field and air jet device addresses uneven paint distribution and contamination issues, enhancing adhesion and uniformity for improved battery manufacturing quality.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Utility models
- Current Assignee / Owner
- JIANGYIN NANOPORE INNOVATIVE MATERIALS TECH LTD
- Filing Date
- 2022-11-30
- Publication Date
- 2026-05-01
AI Technical Summary
The application of paint to a composite current collector using a gravure roll is hindered by differences in recess size and curvature, leading to uneven paint distribution and adhesion, as well as contamination from dust, resulting in poor product quality and material waste.
A gravure roll mechanism with a magnetic field generating device and an air jet device that ionizes a non-polymerizable gas to form plasma, enhancing paint adhesion and uniformity, while a rotating cylindrical frame ensures consistent magnetic field strength and uniform coating.
The solution improves paint adhesion and uniformity on the gravure roll, preventing dripping and scattering, ensuring consistent coating quality and reducing material waste.
Smart Images
Figure 0003255688000001_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery processing, particularly to a gravure roll mechanism, and further to a coating module.
Background Art
[0002] In the process of manufacturing a battery, it is necessary to apply a paint containing a carbon material to the surface of a composite current collector. Currently, it is common to apply the current collector by a gravure roll. After pulling out the paint by the gravure roll, the paint is applied to the surface of the composite current collector. However, the inventor has found the following problems when applying the paint by the gravure roll.
[0003] First, there are differences in the size and curvature of the recesses arranged on the gravure roll. When the paint is thin, it is difficult for the paint to be stably accommodated in the recesses with a small curvature on the gravure roll, so that the paint adhered in the recesses drips from there or is shaken off from the gravure roll by centrifugal force. Second, when the gravure roll is exposed to the atmosphere, it is inevitable that dust in the atmosphere adheres to the gravure roll. When dust adheres to the gravure roll, the paint in the area where the dust adheres is more likely to peel off. Therefore, due to the above reasons, it is difficult for the paint to adhere uniformly to the gravure roll, and furthermore, the paint on the gravure roll is not uniformly applied to the composite current collector, which affects the quality of the product.
Summary of the Invention
[0004] According to various embodiments of the present application, a gravure roll mechanism and a coating module are provided.
[0005] In a first aspect, the present application is a gravure roll mechanism including a roll sleeve with a hollow interior and a magnetic field generating device accommodated in the roll sleeve. The magnetic field generating device comprises a microwave generator and at least two magnetic field enhancing elements, the microwave generator emits microwaves to the magnetic field enhancing elements arranged circumferentially outside the microwave generator, and the microwaves within the magnetic field enhancing elements are reflected to form a magnetic field within the magnetic field enhancing elements. The present invention provides a gravure roll mechanism in which two adjacent magnetic field enhancing elements are bonded together or positioned close enough to be nearly bonded together, thereby bringing the magnetic fields within the two elements closer together and superimposing them to form a strong magnetic field, and the roll sleeve is positioned within this strong magnetic field.
[0006] In one embodiment, the diameter of the magnetic field enhancing element is greater than or equal to the wavelength of the microwaves generated by the microwave generator.
[0007] In one embodiment, the outer walls of two adjacent magnetic field enhancing elements are provided in contact with each other.
[0008] In one embodiment, a rotating cylindrical frame is further provided between the roll sleeve and the microwave generator, and a magnetic field enhancing element is mounted on the rotating cylindrical frame.
[0009] In one embodiment, a microwave generator, a rotating cylinder frame, and a roll sleeve are arranged concentrically.
[0010] In one embodiment, a mounting location for a magnetic field enhancing element is provided on the rotating cylinder frame, and the magnetic field enhancing element is mounted within the mounting location, thereby restricting the position of the magnetic field enhancing element to that of the rotating cylinder frame.
[0011] In one embodiment, a coupling for connecting a drive unit is provided at one end of the rotating cylinder frame, a slide rail is provided inside the rotating cylinder frame as a mounting point, and the magnetic field enhancing element is movable along the slide rail.
[0012] The drive unit rotates the rotating cylinder frame, and the magnetic field enhancing element moves within the slide rail due to centrifugal force, causing two adjacent magnetic field enhancing elements to collide with each other and stick together.
[0013] In one embodiment, a shaft hole for connecting a drive unit is provided at one end of the roll sleeve, a relief hole is provided at the other end of the roll sleeve, and the coupling passes through the relief hole.
[0014] In one embodiment, the joint is equipped with a horn-shaped port, the cross-sectional area of the horn-shaped port gradually decreases from the end face of the rotating cylinder frame toward the relief hole.
[0015] In one embodiment, the roll sleeve comprises a first half-roll body and a second half-roll body, and the first half-roll body and the second half-roll body are connected in a closed manner so that a magnetic field generating device is housed between the first half-roll body and the second half-roll body.
[0016] In a second aspect, this application is, A coating module for applying paint to a composite current collector, A gravure roll mechanism whose outer surface is located within a strong magnetic field, A drive unit used to drive the gravure roll mechanism to rotate, A coating module is provided, comprising an air jet device located above the gravure roll mechanism, which injects a non-polymerizable gas onto the outer surface of the gravure roll mechanism, and the non-polymerizable gas is ionized by a strong magnetic field and grafted onto the outer surface of the gravure roll mechanism.
[0017] In one embodiment, the air jet device comprises at least two air pumps, and a plurality of air pumps are arranged along the axial direction of the gravure roll mechanism.
[0018] In one embodiment, the system further comprises two frames, a gravure roll mechanism is spanned between the two frames, a support rod is rotatably connected between the frames, and multiple air pumps are attached to the support rod.
[0019] In one embodiment, a motor is built into the frame, and the motors in the two frames are connected to both ends of the gravure roll mechanism.
[0020] In one embodiment, the gravure roll mechanism is located below the composite current collector, and the gravure roll mechanism and the composite current collector are provided in contact with each other. An air jet device is provided below the composite current collector, and the air jet device injects a non-polymerizable gas to the position where the gravure roll mechanism and the composite current collector are in contact.
Brief Description of the Drawings
[0021] To more clearly explain the technical solutions in the embodiments of the present application or the prior art, the drawings required for the description of the embodiments or the prior art will be briefly introduced below. However, the drawings in the following description are only the embodiments of the present application, and it is obvious that those skilled in the art can obtain other drawings based on the disclosed drawings without creative labor.
[0022] [Figure 1] It is a perspective view of a coating module according to one or more embodiments. [Figure 2] It is a partially enlarged schematic view at A in FIG. 1. [Figure 3] It is a sectional view of a coating module according to one or more embodiments. [Figure 4] It is a front view of a coating module according to one or more embodiments. [Figure 5] It is a perspective view of a gravure roll mechanism according to one or more embodiments. [Figure 6] It is a sectional view of a gravure roll mechanism according to one or more embodiments from a first viewing angle. [Figure 7] It is a partially enlarged schematic view at B in FIG. 6. [Figure 8] It is a sectional view of a gravure roll mechanism according to one or more embodiments from a second viewing angle. [Figure 9] It is a partially enlarged schematic view at C in FIG. 8.
Modes for Carrying Out the Invention
[0023] The technical concepts described herein will be clearly and completely explained below with reference to the drawings of the embodiments of this application, although it is clear that the embodiments described are not all embodiments, but only a selection of embodiments of this application. All other embodiments that can be obtained by a person skilled in the art without creative work based on the embodiments of this application are all within the scope of protection of this application.
[0024] In the description of this application, terms such as "center," "vertical," "horizontal," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" refer to orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are merely for the purpose of making the description of this application easier to understand and simplifying the explanation. It is important to understand that these terms do not indicate or suggest that the shown devices or elements necessarily have a specific orientation or are constructed and operated in a specific orientation, and therefore should not be considered as limiting this application.
[0025] Furthermore, terms such as "first," "second," etc., are used solely for descriptive purposes and should not be understood as indicating or suggesting relative importance or implicitly representing the number of technical features shown. Thus, features limited by "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, "plural" means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.
[0026] In this application, unless otherwise explicitly stated and limited, the terms “attach,” “contact,” “connect,” and “fix” should be understood in a broad sense. For example, unless otherwise explicitly stated, a fixed connection may be a detachable connection, or they may be integrated; they may be mechanical connections or electrical connections; they may be direct contacts, indirect contacts via an intermediate medium, or internal communication between two elements or an interaction relationship between two elements. Those skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.
[0027] In this application, unless otherwise specifically stated and limited, the presence of a first feature "above" or "below" a second feature may mean that the first and second features are in direct contact, or that they are indirectly in contact through an intermediate mediator. Furthermore, the presence of a first feature "above," "above," and "on the top surface" of a second feature means that the first feature is directly above and diagonally above the second feature, or simply that the horizontal height of the first feature is greater than that of the second feature. The presence of a first feature "below," "below," and "on the bottom surface" of a second feature means that the first feature is directly below and diagonally below the second feature, or simply that the horizontal height of the first feature is less than that of the second feature.
[0028] When an element is said to be "fixed" or "attached" to another element, it may be directly on top of the other element, or there may be an intermediate element present. When one element is considered to be "connected" to another element, it may be directly connected to the other element, or there may be an intermediate element present simultaneously. The terms “vertical,” “horizontal,” “up,” “down,” “left,” and “right” and similar expressions used herein are for illustrative purposes only and do not represent only the embodiments.
[0029] In the battery manufacturing process, it is necessary to apply nanocarbon, which requires coating the surface of the device, i.e., the composite current collector, with paint and then heating it. This paint is formed by mixing a solution with carbon materials, including conductive graphite, graphene, or carbon nanotubes. The carbon materials in the paint improve conductivity and can increase the bonding strength between the composite current collector and the positive or negative electrode material. The currently used coating method is gravure coating, in which a portion of the gravure roll with small indentations is rotated into a cartridge of a carbon coating device containing the paint. The paint is then drawn out of the cartridge by the indentations and applied to the composite current collector as it passes over the surface of the gravure roll, thereby achieving coating printing on the substrate surface. However, when the paint is applied to a conventional gravure roll, it does not adhere tightly to the gravure roll, resulting in paint sparseness in some areas of the gravure roll and, accordingly, paint concentration in other areas.
[0030] First, differences in the fine structure and curvature at a microscopic level result in uneven paint distribution. Furthermore, differences in the size and curvature of the paint-retaining recesses on the gravure roll, combined with a thin layer of paint, reduce the paint's viscosity, making it difficult for the paint to adhere to the gravure roll.
[0031] Next, when dust adheres to the surface of the gravure roll, the paint may not adhere tightly to the surface of the gravure roll in some areas. If the dust becomes embedded in a recess, the curvature of the recess decreases, making it difficult for the paint to adhere to the recess where the dust is embedded. Alternatively, when paint adheres to the gravure roll, the dust will peel off in the areas of the gravure roll corresponding to where the dust was attached, resulting in areas where there is no paint.
[0032] If the paint does not adhere tightly to the surface of the gravure roll, when the gravure roll is rotated, the paint that is tightly adhered to the surface will be scattered outwards by centrifugal force, or the paint will drip downwards due to gravity due to the limitations of the gravure roll's suction force, resulting in uneven paint distribution on the gravure roll and, furthermore, uneven paint distribution on the composite current collector. This not only affects the quality of the composite current collector but also leads to a significant waste of raw materials, and the scattered paint may contaminate the carbon coating equipment, potentially affecting its normal operation.
[0033] Referring to Figure 1, in some embodiments of this application, the application provides a coating module comprising a gravure roll mechanism, a drive unit, and an air jet device 11. The gravure roll mechanism is located in a strong magnetic field, and the drive unit is used to drive the gravure roll mechanism to rotate. The air jet device 11 injects a non-polymerizable gas onto the outer surface of the gravure roll mechanism, where the non-polymerizable gas is ionized by the strong magnetic field, and the plasma is crosslinked (grafted) onto the outer surface of the gravure roll mechanism. By imparting new properties to the outer surface of the gravure roll mechanism, the hydrophilicity of the outer surface of the gravure roll mechanism is improved, and the paint can be adhered more firmly to the outer surface of the gravure roll mechanism.
[0034] In this embodiment, a strong magnetic field ionizes the non-polymerizable gas ejected from the air jet device 11, forming a plasma polymer on the outer surface of the gravure roll mechanism. This gives the outer surface of the gravure roll mechanism hydrophilicity and further improves the adsorption force of the gravure roll mechanism to liquids. This prevents the paint from peeling off the gravure roll mechanism due to centrifugal force and gravity during rotation, prevents paint from dripping or scattering in certain areas of the gravure roll mechanism, and ensures uniformity of the paint within the gravure roll mechanism. The air jet device 11 also plays a role in cleaning the gravure roll mechanism by injecting gas into it, which blows away dust adhering to the gravure roll mechanism.
[0035] The principle by which plasma crosslinking (grafting) onto the outer surface of the gravure roll mechanism imparts new properties to the outer surface of the gravure roll mechanism is that a non-polymerizable gas ejected by the air jet device 11 is ionized by a strong magnetic field to form plasma, and the plasma forms new bonds on the surface of the gravure roll mechanism, thereby imparting new properties to the surface of the gravure roll mechanism and making it hydrophilic. The principle by which plasma crosslinking onto the gravure roll mechanism imparts new properties to the surface of the gravure roll mechanism is that energy particles in the plasma and the surface of the gravure roll mechanism undergo a crosslinking reaction, generating active groups such as polar groups and radicals on the surface of the gravure roll mechanism, and the plasma is highly crosslinked (grafted) onto the gravure roll mechanism. The plasma polymer formed by the crosslinking (grafting) of plasma onto the gravure roll mechanism has a network structure, thus giving the gravure roll mechanism properties such as hydrophilicity, thermal stability, chemical stability, mechanical strength, film permeability, and biocompatibility. The graft chains are chemically stable, and copolymerization between the plasma and the gravure roll mechanism gives the surface of the gravure roll mechanism hydrophilicity.
[0036] Referring further to Figures 2 and 4, the coating module further comprises two frames 16, each frame 16 comprising side plates 161. The gravure roll mechanism and connecting rod 162 are attached to the side plates 161, thereby bridging the gap between the two frames 16. The drive unit is located within the frame 16. A support rod 112 is rotatably connected between the frames 16, and the air jet device 11 comprises at least two air pumps 111, with multiple air pumps 111 attached to the support rod 112. The axial direction of the support rod 112 and the axial direction of the gravure roll mechanism are aligned parallel to each other, so that the multiple air pumps 111 are positioned along the axial direction of the gravure roll mechanism.
[0037] Multiple air pumps 111 spray onto corresponding different locations on the gravure roll mechanism to uniformly form plasma polymers on the gravure roll mechanism, thereby ensuring that the surfaces of the gravure roll mechanism are all hydrophilic, the paint attached to the gravure roll mechanism is distributed more uniformly, and the paint adheres firmly to the gravure roll mechanism during rotation, preventing it from being easily shaken off. Referring to Figure 3, the air pump 111 is provided with nozzles 1111 that spray toward the gravure roll mechanism. In this embodiment, the nonpolymerizable gas can be selected from any one of the following gases: He, Ar, O2, CO2, NH3, H2, etc. Since the densities of different types of nonpolymerizable gases are different, the injection routes of the nonpolymerizable gas ejected from the air pump 111 are different. To ensure that the gas ejected from the air pump 111 covers the surface of the gravure roll mechanism, the gas injection distance can be controlled by the flow velocity of the gas stream ejected from the air pump 111 or by the injection angle of the nozzles 1111 toward the gravure roll mechanism. In one specific embodiment, a support rod 112 is rotatably connected to a frame 16, and an air pump 111 attached to the support rod 112 can rotate together with the support rod 112. By adjusting the spray angle of the nozzle 1111 toward the gravure roll mechanism as the support rod 112 rotates, the air pump 111 can be accurately sprayed toward the gravure roll mechanism, and by adjusting the spray angle of the nozzle 1111, it is ensured that different non-polymerizable gases are accurately sprayed toward the gravure roll mechanism.
[0038] In one embodiment, the air jet device 11 is provided above the gravure roll mechanism. The cartridge in the carbon coating device is provided below the gravure roll mechanism. The lower arc surface of the gravure roll mechanism is located at the cartridge, and the lower arc surface can draw paint from inside the cartridge. The air pump 111 is directed towards the upper arc surface of the gravure roll mechanism so that non-agglomerated gas falls onto the upper arc surface of the gravure roll mechanism. The upper arc surface of the gravure roll mechanism is the semi-arc surface at the top in the vertical direction of the gravure roll mechanism when it rotates, and the lower arc surface of the gravure roll mechanism is the semi-arc surface at the bottom in the vertical direction when it rotates. It can be understood that the upper and lower arc surfaces of the gravure roll mechanism change after rotation, and after a 180° rotation, 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.
[0039] When this coating module transmits the composite current collector, the composite current collector passes through the air jet device 11 and is then bonded to the gravure roll mechanism, allowing the composite current collector to continuously undergo carbon coating processing in the gravure roll mechanism, while simultaneously, the air jet device 11 continuously injects gas into the gravure roll mechanism. The composite current collector and the gravure roll mechanism are provided in contact with each other, with the gravure roll mechanism located below the composite current collector, and the air jet device 11 also located below the composite current collector. By injecting gas into the contact area between the gravure roll mechanism and the composite current collector, the air jet device 11 allows the plasma ionized by the strong magnetic field in the gravure roll mechanism to be bridged to the composite current collector, and also imparts new properties to the surface of the composite current collector material and the gravure roll mechanism.
[0040] In some embodiments of this application, the gravure roll mechanism comprises a roll sleeve 12 and a magnetic field generator 15. A recess is provided on the outer surface of the roll sleeve 12, and paint can be contained within the recess, and the roll sleeve 12 is hollow inside. The magnetic field generator 15 is provided in the hollow space of the roll sleeve 12, and the surface of the roll sleeve 12 forms a strong magnetic field via the magnetic field generator 15 for ionizing a non-polymerizable gas.
[0041] In one embodiment, referring to Figures 5 and 6, the magnetic field generator 15 comprises a microwave generator 151 and at least two magnetic field enhancing elements 153, the magnetic field enhancing elements 153 being arranged circumferentially outside the microwave generator 151. Microwaves generated by the microwave generator 151 are confined within the magnetic field enhancing elements 153, and at least one wavelength of microwaves confined within the magnetic field enhancing elements 153 is reflected at the edges of the magnetic field enhancing elements 153, forming a standing wave inside the magnetic field enhancing elements 153. This standing wave inside the magnetic field enhancing elements 153 can form a magnetic field through resonance, and the magnetic field strength increases closer to the center of the magnetic field enhancing elements 153. When two adjacent magnetic field enhancing elements 153 are placed close together, either joined or nearly joined, the magnetic fields within each element are attracted to each other and converge. The magnetic field with the greatest strength within each element shifts from its center to the position where the two elements are joined, superimposing the magnetic fields to form a strong magnetic field, which then spreads across the outer surface of the roll sleeve 12. Due to the strong magnetic field, when a non-polymerizable gas approaches the roll sleeve 12, the non-polymerizable gas is first brought into contact with the strong magnetic field and ionized into a plasma. The plasma then approaches the roll sleeve 12 and can bridge onto its surface.
[0042] In this embodiment, at least two sets of magnetic field enhancing elements 153 form the same number of corresponding strong magnetic fields, and since the magnetic field enhancing elements 153 are arranged on the circumferential outer side of the microwave generator 151, multiple strong magnetic fields are provided circumferentially on the outside of the microwave generator 151, and these multiple strong magnetic fields are located at different positions on the roll sleeve 12.
[0043] In the case where two adjacent magnetic field enhancing elements 153 are bonded together, the outer walls of the two adjacent magnetic field enhancing elements 153 are in contact. In the case where two adjacent magnetic field enhancing elements 153 are approximately bonded together, the distance between the two adjacent magnetic field enhancing elements 153 is approximately smaller than the wavelength of one microwave. Only when the pitch between two adjacent magnetic field enhancing elements 153 is sufficiently close, the magnetic fields within the two magnetic field enhancing elements 153 act on each other, are further attracted to each other, and superimpose the two magnetic fields to improve the magnetic flux density, that is, to form a strong magnetic field.
[0044] In this embodiment, the magnetic field strength can be increased by superimposing the magnetic fields in two adjacent magnetic field enhancing elements 153, and the roll sleeve 12 is positioned within the magnetic field to further achieve the objective of ionizing the gas. Since the magnetic field generator 15 is housed within the roll sleeve 12, it is not necessary to provide the magnetic field generator outside the gravure roll structure, and in this embodiment, the gravure roll structure becomes more compact, redundant parts are avoided, and the space required for the coating module is reduced. At the same time, the roll sleeve 12 covers the outer circumference of the magnetic field generator 15, and the magnetic field generator 15 being covered by the roll sleeve 12 prevents collisions, better protects the magnetic field generator 15, and extends its service life.
[0045] On the other hand, when microwaves are reflected within the magnetic field enhancing element 153, the magnetic field strength is greatest at the center of the magnetic field enhancing element 153. At the same time, standing waves within the magnetic field enhancing element 153 can increase heat through resonance. More specifically, the heat within the magnetic field enhancing element 153 concentrates at the center, resulting in the greatest temperature increase at the center of the magnetic field enhancing element 153. This principle is similar to that of a microwave oven, where the location where the temperature within the magnetic field enhancing element 153 rises correlates with the location where the magnetic field within the magnetic field enhancing element 153 increases; that is, the greater the magnetic field strength within the magnetic field enhancing element 153, the higher the temperature rises at that location. When two magnetic field enhancing elements 153 are bonded together, the magnetic fields of the two elements shift and concentrate at the contact point between them. Simultaneously, the heat within the magnetic field enhancing elements 153 also concentrates at the contact point between them, making it easier for the heat to diffuse from within the magnetic field enhancing element 153 to the outside, further increasing the temperature of the roll sleeve 12 surface. In the nanocarbon coating process, heating is required when applying paint to the surface of the composite current collector. Therefore, the composite current collector needs to be heated for a certain period of time by a heating module to raise it to a predetermined temperature. In this embodiment, the heat from the roll sleeve 12 is transferred to the composite current collector, allowing the composite current collector to rise to the temperature required for the carbon coating process more quickly and improving the carbon coating efficiency.
[0046] It can be understood that the diameter of the magnetic field augmentation element 153 is greater than or equal to the wavelength of the microwaves generated by the microwave generator 151, so that at least one complete wavelength of microwaves is confined within the magnetic field augmentation element 153. In this embodiment, the transmission speed of microwaves within the magnetic field augmentation element 153 is related to the material of the magnetic field augmentation element 153. Specifically, as the transmission speed of microwaves within the magnetic field augmentation element 153 decreases, the wavelength of microwaves within the magnetic field augmentation element 153 also decreases. Therefore, the diameter of the magnetic field augmentation element 153 is not limited to being greater than or equal to the wavelength of microwaves generated by the microwave generator 151. As long as the diameter of the magnetic field augmentation element 153 is greater than or equal to one wavelength of microwaves within the magnetic field augmentation element 153, the objective of forming a magnetic field by reflection of microwaves within the magnetic field augmentation element 153 and resonance can be achieved.
[0047] In one embodiment, 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. Microwaves generated by the microwave generator 151 can diffuse into the magnetic field enhancing element 153, confining microwaves of one wavelength within the magnetic field enhancing element 153. Microwaves inside the magnetic field enhancing element 153 are reflected at the edge, and the reflected microwaves form standing waves inside the magnetic field enhancing element 153. These standing waves resonate and form a magnetic field at the center of the magnetic field enhancing element 153.
[0048] In this embodiment, the materials of the magnetic field enhancing element 153 and roll sleeve 12 are inorganic materials with high temperature resistance so that microwaves or magnetic fields can diffuse into the magnetic field enhancing element 153 and roll sleeve 12, that is, so that microwaves enter the magnetic field enhancing element 153 or strong magnetic fields pass through the roll sleeve 12 and a strong magnetic field exists on the outer surface of the roll sleeve 12. At the same time, the magnetic field enhancing element 153 and roll sleeve 12 made of inorganic materials ensure stability and avoid damage when the magnetic field enhancing element 153 and roll sleeve 12 are ionized, and a large amount of heat is generated when the magnetic field enhancing element 153 and roll sleeve 12 are ionized, causing a rapid rise in temperature of the magnetic field enhancing element 153 and roll sleeve 12, which would affect the stability of the magnetic field enhancing element 153 and roll sleeve 12.
[0049] Furthermore, the magnetic field enhancing element 153 is roll-shaped, and its length matches the length of the microwave generator 151, allowing microwaves generated in the microwave generator 151 to be transmitted into the magnetic field enhancing element 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 elements 153 are placed in contact with each other, causing the magnetic fields within the two elements 153 to shift towards the contact point, resulting in a greater concentration of the two magnetic fields and increasing the strength of the strong magnetic field formed after the magnetic fields are superimposed.
[0050] The shape of the magnetic field enhancing element 153 includes, but is not limited to, a roll shape, and it can be understood that the magnetic field enhancing element 153 may be selected to be spherical. When the magnetic field enhancing element 153 has 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, and there are at least two subsets of magnetic field enhancing elements, and the subsets of magnetic field enhancing elements are arranged along the axial direction of the roll sleeve 12, and a barrier is required between two adjacent subsets of magnetic field enhancing elements, so that the magnetic field enhancing elements 153 in the two subsets of magnetic field enhancing elements do not come into contact with each other, so that the magnetic field enhancing elements 153 in each subset of magnetic field enhancing elements independently generate a magnetic field superposition effect, and multiple sets of subsets of magnetic field enhancing elements make it easier to form multiple strong magnetic fields, so that different positions on the roll sleeve 12 are located in different strong magnetic fields, and the strong magnetic fields on the roll sleeve 12 are distributed more uniformly.
[0051] In some embodiments of this application, a rotating cylindrical frame 152 is further provided between the roll sleeve 12 and the magnetic field generator 15, and a magnetic field enhancing element 153 is mounted on the rotating cylindrical frame 152. The rotating cylindrical frame 152 has a cylindrical structure, a microwave generator 151 is provided inside the hollow interior of the rotating cylindrical frame 152, and the roll sleeve 12 is covered from the outside of the rotating cylindrical frame 152. In addition, mounting locations for the magnetic field enhancing element 153 are provided on the rotating cylindrical frame 152, and by mounting the magnetic field enhancing element 153 on these locations, the position of the magnetic field enhancing element 153 is restricted by the rotating cylindrical frame 152.
[0052] In one embodiment, the magnetic field enhancing elements 153 are fixed to the rotating cylindrical frame 152, and the outer walls of two adjacent magnetic field enhancing elements 153 are in contact with each other. By the two magnetic field enhancing elements 153 being in contact with each other, a pair of magnetic fields formed by resonance between the two magnetic field enhancing elements 153 is maximized.
[0053] In another embodiment, referring to Figure 7, a slide rail 1522 is provided within the rotating cylinder frame 152 to house the magnetic field enhancing element 153, and the magnetic field enhancing element 153 is movable along the slide rail 1522. The drive unit can not only drive the roll sleeve 12 to rotate, but also drive the rotating cylinder frame 152 to rotate. When the drive unit drives the rotating cylinder frame 152 to rotate, the magnetic field enhancing element 153 slides against the rotating cylinder frame 152 due to the effect of centrifugal force, and the magnetic field enhancing elements 153 are continuously swung apart and collide with each other and come into contact. In this process, some of the magnetic field enhancing elements 153 gradually move closer together so that the microwaves within the magnetic field enhancing elements 153 resonate.
[0054] Furthermore, as shown in Figures 5 and 6, the roll sleeve 12 has two opposing first end faces 123 and second end faces 124, of which an axial hole 1231 is provided in the first end face 123, and the output shaft of the drive unit is connected to the axial hole 1231 in order to drive the roll sleeve 12 to rotate. At the same time, a coupling for connecting the drive unit is provided at one end of the rotating cylinder frame 152.
[0055] As an example, a microwave generator 151, a rotating cylinder frame 152, and a roll sleeve 12 are arranged concentrically. The microwave generator 151, the rotating cylinder frame 152, and the roll sleeve 12 are fitted together with clearances between them. As shown in Figure 1, the drive unit comprises a first motor 13 and a second motor 14, which are housed in two frames 16 corresponding to each other. The output shaft of the first motor 13 is connected to the shaft hole 1231, and the output shaft of the second motor 14 is connected to the coupling, thereby allowing the roll sleeve 12 to rotate relative to the rotating cylinder frame 152.
[0056] During use, the following problems were found. When the drive unit drives the rotating cylinder frame 152 and the roll sleeve 12 to move synchronously, the magnetic field strength on the surface of the roll sleeve 12 is maintained. However, the roll sleeve 12 is used to transmit a composite current collector, and the composite current collector is continuously transmitted forward by the roll sleeve 12. Therefore, in order to achieve unidirectional transmission, the drive unit needs to drive the roll sleeve 12 to maintain unidirectional rotation. At the same time, when the rotating cylinder frame 152 rotates in one direction due to the drive of the roll sleeve 12, the magnetic field enhancing element 153 is held in place by centrifugal force so that the rotating cylinder frame 152 eventually comes to a stop. As a result, the magnetic field strength formed between the magnetic field enhancing elements 153 is maintained, and the hydrophilicity of the surface of the roll sleeve 12 is maintained.
[0057] It can be understood that the hydrophilicity of the roll sleeve 12 needs to be matched to the product film material and paint components on the surface of the composite current collector. Generally, the greater the magnetic field strength, the greater the ionized gas energy, and the better the hydrophilicity of the surface of the roll sleeve 12. However, if the hydrophilicity is too good, the force of the paint adsorbing to the surface of the roll sleeve 12 is too great, making it difficult for the paint to move to the product film and affecting the coating effect. Based on this, the magnetic field strength on the surface of the roll sleeve 12 needs to be matched to the product film material and paint components, and it is difficult to satisfy the product film material and paint components of different composite current collector surfaces with a single magnetic field strength. For example, when the paint is thin, a strong magnetic field is required for the roll sleeve 12, while when the paint is thick, only a weak magnetic field is required for the roll sleeve 12.
[0058] Accordingly, in this embodiment, the rotating cylinder frame 152 is driven by an independent second motor 14, which controls the rotation speed and direction of the rotating cylinder frame 152. As the rotating cylinder frame 152 rotates, the magnetic field enhancing elements 153 continuously separate and collide, further controlling the magnetic field strength in the roll sleeve 12. At the same time, the magnetic field enhancing elements 153 form a set of magnetic fields between them due to centrifugal force, and the strong magnetic field covers the roll sleeve 12 more uniformly. In this configuration, the roll sleeve 12 and the rotating cylinder frame 152 can rotate at different speeds, so that the same position in the roll sleeve 12 can be covered by different strong magnetic fields. For example, if the rotation speed of the roll sleeve 12 is faster than that of the rotating cylinder frame 152, a larger area of the outer surface of the roll sleeve 12 can pass through a single strong magnetic field, and the plasma can be bridged over a larger area of the outer surface of the roll sleeve 12 by the strong magnetic field. As the rotating cylinder frame 152 rotates, the magnetic field enhancing element 153 is uniformly distributed on the inner wall of the roll sleeve 12 by centrifugal force. Furthermore, since the regions covered by each strong magnetic field do not overlap, the ionized area of the strong magnetic field is expanded, while avoiding overlap of the ionized areas of each magnetic field ensures uniformity in the bridging of the roll sleeve 12 to the plasma, thereby improving the efficiency of ionization of the strong magnetic field.
[0059] Furthermore, if the rotating cylinder frame 152 does not rotate, the magnetic field enhancing element 153 gathers at the bottom of the rotating cylinder frame 152 due to the influence of its own gravity, causing the magnetic field in the roll sleeve 12 to concentrate at the bottom of the roll sleeve 12, resulting in an uneven magnetic field in the roll sleeve 12. In order to improve the hydrophilicity of the composite current collector surface, it is necessary to bridge the composite current collector surface in the roll sleeve 12 with the plasma at the same time as the magnetic field in the roll sleeve 12. If the magnetic field in the roll sleeve 12 is concentrated at the bottom of the roll sleeve 12, the magnetic field will affect the efficiency of ionizing the non-agglomerated gas, and further affect the efficiency of plasma bridging (grafting) onto the composite current collector.
[0060] When the rotating cylinder frame 152 rotates, the magnetic field enhancing element 153 moves along the slide rail 1522 inside the rotating cylinder frame 152. Compared to when the rotating cylinder frame 152 does not rotate, the magnetic field distribution in the roll sleeve 12 becomes more uniform, the hydrophilicity of the surface of the roll sleeve 12 becomes more uniform, the magnetic field strength in the top region of the roll sleeve 12 is improved, the efficiency of magnetic field ionization in the top region of the roll sleeve 12 is improved, and the plasma is more easily bridged to the surface of the composite current collector.
[0061] For example, the slide rail 1522 within the rotating cylinder frame 152 is a closed cavity, the magnetic field enhancing element 153 is housed within the slide rail 1522, and 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 magnetic field enhancing elements 153 when two adjacent magnetic field enhancing elements 153 are brought together. The filled inert gas prevents damage to the magnetic field enhancing elements 153 due to ionization and extends the service life of the magnetic field enhancing elements 153.
[0062] Furthermore, as shown in Figure 5 and referring to Figure 9, a relief hole 1241 is provided at the other end of the roll sleeve 12 (i.e., the second end face 124), and the coupling passes through the relief hole 1241. A horn-shaped port 1521 is provided as a coupling at one end of the rotating cylinder frame 152, and this horn-shaped port 1521 extends outward from the end face of the rotating cylinder frame 152 along the axial direction of the rotating cylinder frame 152, and the horn-shaped port 1521 protrudes from the second end face 124. As shown in Figure 2, a sleeve 17 is provided between the second end face 124 and the second motor 14, and the sleeve 17 brings the horn-shaped port 1521 into contact with the output shaft of the second motor 14. Exemplarily, the size of the cross-sectional area along the extending direction of the horn-shaped port 1521 gradually decreases, so that the horn-shaped port 1521 can be inserted into the sleeve 17. At the same time, the horn-shaped port 1521 is hollow inside. When the roll sleeve 12 and the rotating cylinder frame 152 rotate, the microwave generator 151, which is spaced apart from the rotating cylinder frame 152, remains stationary. The power lines of the microwave generator 151 protrude from this gravure roll structure by passing through the hollow horn-shaped port 1521 to avoid the problem of the power lines of the microwave generator 151 becoming entangled due to rotation. Note that the microwave generator 151 is not limited to being connected to an external AC power source via power lines; it may also be powered by a DC power source such as a storage battery housed within the gravure roll structure, which similarly avoids the problem of wire entanglement. When power is supplied by a storage battery, in order to open and close the microwave generator 151, a wireless transmitting module may be provided that transmits an operation or pause command signal to a wireless receiving module via a medium, and a wireless receiving module may be provided that controls whether or not the storage battery supplies power to the microwave generator 151 based on the operation or pause command signal.
[0063] In some embodiments of this application, as shown in Figure 5, the roll sleeve 12 comprises a first half-roll body 121 and a second half-roll body 122, the first half-roll body 121 and the second half-roll body 122 forming the roll sleeve 12 by splicing, and the structure of the first half-roll body 121 and the second half-roll body 122 facilitates attachment and detachment. When the magnetic field generator 15 is incorporated into the first half-roll body 121 or the second half-roll body 122, the other half structure of the roll sleeve 12 is attached, and the attachment process of the gravure roll structure is completed, making it easy to attach and detach the gravure roll structure for repair and maintenance.
[0064] The various technical features of the above embodiments may be combined in any way, and for the sake of convenience, not all possible combinations of the technical features of the above embodiments will be described. However, as long as these combinations of technical features are not contradictory, they should be considered to fall within the scope described herein.
[0065] The above embodiments illustrate only a few embodiments of this application, and while their descriptions are relatively specific and detailed, they should not be understood as limiting the scope of protection of this invention. Those skilled in the art should note that several modifications and improvements can be made without departing from the spirit of this application, and all of these fall within the scope of protection. Therefore, the scope of protection of this invention should be in accordance with the attached utility model claims.
Claims
1. A roll sleeve (12) with a hollow interior, A gravure roll mechanism comprising a magnetic field generating device (15) housed within the roll sleeve (12), The magnetic field generating device (15) comprises a microwave generator (151) and at least two magnetic field enhancing elements (153), wherein the microwave generator (151) emits microwaves to the magnetic field enhancing elements (153) which are arranged circumferentially outside the microwave generator, and the microwaves within the magnetic field enhancing elements (153) are reflected to form a magnetic field within the magnetic field enhancing elements (153). A gravure roll mechanism characterized in that two adjacent magnetic field enhancing elements (153) are bonded together or brought close to each other so as to be nearly bonded together, thereby bringing the magnetic fields within the two magnetic field enhancing elements (153) together and superimposing them to form a strong magnetic field, and the roll sleeve (12) is located within the strong magnetic field.
2. The gravure roll mechanism according to claim 1, characterized in that the diameter of the magnetic field enhancing element (153) is greater than or equal to the wavelength of the microwaves generated by the microwave generator (151).
3. The gravure roll mechanism according to claim 2, characterized in that the outer walls of two adjacent magnetic field enhancing elements (153) are provided in contact with each other.
4. The gravure roll mechanism according to claim 2, further comprising a rotating cylindrical frame (152) between the roll sleeve (12) and the microwave generator (151), and the magnetic field enhancing element (153) mounted on the rotating cylindrical frame (152).
5. The gravure roll mechanism according to claim 4, characterized in that the microwave generator (151), the rotating cylinder frame (152), and the roll sleeve (12) are arranged concentrically.
6. The gravure roll mechanism according to claim 4, characterized in that a mounting location for a magnetic field enhancing element (153) is provided on the rotating cylindrical frame (152), and the magnetic field enhancing element (153) is mounted within the mounting location, thereby restricting the position of the magnetic field enhancing element (153) to the rotating cylindrical frame (152).
7. A coupling for connecting the drive unit is provided at one end of the rotating cylinder frame (152), a slide rail (1522) as the mounting location is provided inside the rotating cylinder frame (152), and the magnetic field enhancing element (153) is movable along the slide rail (1522). The gravure roll mechanism according to claim 6, characterized in that the rotating cylindrical frame (152) rotates when driven by the drive unit, and the magnetic field enhancing element (153) moves within the slide rail (1522) due to centrifugal force, causing two adjacent magnetic field enhancing elements (153) to collide with each other and stick together.
8. The gravure roll mechanism according to claim 7, characterized in that a shaft hole (1231) for connecting a drive unit is provided at one end of the roll sleeve (12), a relief hole (1241) is provided at the other end of the roll sleeve (12), and the coupling penetrates through the relief hole (1241).
9. The gravure roll mechanism according to claim 8, characterized in that the joint comprises a horn-shaped port (1521), and the cross-sectional area of the horn-shaped port (1521) gradually decreases from the end face of the rotating cylinder frame (152) toward the relief hole (1241).
10. The gravure roll mechanism according to any one of claims 1 to 9, characterized in that the roll sleeve (12) comprises a first half-roll body (121) and a second half-roll body (122), and the first half-roll body (121) and the second half-roll body (122) are connected in a closed manner so that the magnetic field generating device (15) is housed between the first half-roll body (121) and the second half-roll body (122).
11. A coating module for applying paint to a composite current collector, A gravure roll mechanism whose outer surface is located within a strong magnetic field, A drive unit used to drive the gravure roll mechanism to rotate, A coating module characterized by comprising an air jet device (11) located above the gravure roll mechanism, the air jet device (11) injects a nonpolymerizable gas onto the outer surface of the gravure roll mechanism, the nonpolymerizable gas being ionized by the strong magnetic field and grafted onto the outer surface of the gravure roll mechanism.
12. The coating module according to claim 11, characterized in that the air jet device (11) comprises at least two air pumps (111), and a plurality of the air pumps (111) are arranged along the axial direction of the gravure roll mechanism.
13. The coating module according to claim 12, further comprising two frames (16), wherein the gravure roll mechanism is spanned between the two frames (16), a support rod (112) is rotatably connected between the frames (16), and a plurality of the air pumps (111) are attached to the support rod (112).
14. The coating module according to claim 13, characterized in that a motor is built into the frame (16), and the motors in the two frames (16) are connected to both ends of the gravure roll mechanism.
15. The gravure roll mechanism is located below the composite current collector, and the gravure roll mechanism and the composite current collector are provided in contact with each other. The coating module according to any one of claims 11 to 14, characterized in that the air jet device (11) is provided below the composite current collector, and the air jet device (11) injects a non-polymerizable gas at the position where the gravure roll mechanism and the composite current collector are in contact.