WO2024113239A1

WO2024113239A1 - Gravure roller mechanism and coating module

Info

Publication number: WO2024113239A1
Application number: PCT/CN2022/135511
Authority: WO
Inventors: 宋启超; 季玉琴; 杨开福; 王成豪; 李学法; 张国平
Original assignee: 江阴纳力新材料科技有限公司
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2024-06-06

Abstract

The present application relates to a gravure roller mechanism and a coating module. The mechanism comprises a roller sleeve (12), the roller sleeve (12) being hollow inside; and a magnetic field generation device (15) accommodated in the roller sleeve (12), wherein the magnetic field generation device (15) comprises a microwave generator (151) and at least two magnetic field enhancement elements (153), the magnetic field enhancement elements (153) being arranged on an outer side of the microwave generator in a circumferential direction; the microwave generator (151) emits microwaves to the circumferential magnetic field enhancement elements (153) in the circumferential direction, and the microwaves in the magnetic field enhancement elements (153) are reflected to form magnetic fields in the magnetic field enhancement elements (153); the two adjacent magnetic field enhancement elements (153) are either fitted to each other, or are close to each other to be approximately fitted to each other, such that the magnetic fields in the two magnetic field enhancement elements (153) converge and superpose to form a strong magnetic field; and the roller sleeve (12) is located in the strong magnetic field. The strong magnetic field ionizes gas on the surface of the roller sleeve (12), providing the roller sleeve (12) with hydrophilicity; and the magnetic generation device (15) is accommodated in the roller sleeve (12), such that the gravure roller mechanism is more compact.

Description

Gravure roller mechanism and coating module

Technical Field

The present application relates to the field of battery processing, in particular to a gravure roller mechanism and a coating module.

Background technique

In the process of preparing the battery, it is necessary to apply a carbonaceous material coating on the surface of the composite current collector. At present, a gravure roller is commonly used to coat the current collector, and the coating is brought out by the gravure roller and then coated on the surface of the composite current collector. However, the inventors found the following problems when using the gravure roller to apply the coating:

First, the size and curvature of the pits arranged on the gravure roller vary. If the coating is thin, it is difficult for the coating to be stably contained in the pits with small curvature on the gravure roller, which will cause the coating attached to the pits to drip from them or be thrown off the gravure roller due to centrifugal force. Secondly, the gravure roller is exposed to the atmosphere, and dust in the atmosphere will inevitably adhere to the gravure roller. If there is dust attached to the gravure roller, the coating in the dust-attached area is more likely to fall off. Therefore, due to the above reasons, it is difficult for the coating to be evenly attached to the gravure roller, and then the coating on the gravure roller is not evenly applied to the composite current collector, which affects the product quality.

Summary of the invention

According to various embodiments of the present application, a gravure roller mechanism and a coating module are provided.

In a first aspect, the present application provides a gravure roller mechanism, comprising:

A roller sleeve, wherein the roller sleeve is hollow inside; and

A magnetic field generating device housed in 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, and the microwaves in the magnetic field enhancing elements are reflected to form a magnetic field in the magnetic field enhancing elements;

Two adjacent magnetic field enhancement elements are in close contact 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.

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.

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

In one embodiment, a rotating drum frame is provided between the roller sleeve and the microwave generator, and the magnetic field enhancement element is installed on the rotating drum frame.

In one embodiment, the microwave generator, the rotating drum frame and the roller sleeve are arranged in concentric circles.

In one embodiment, the rotating drum frame is provided with a mounting position for the magnetic field enhancement element, and the magnetic field enhancement element is installed in the mounting position so that the magnetic field enhancement element is limited on the rotating drum frame.

In one embodiment, an interface is provided at one end of the rotating drum frame, the interface is used to connect the driving part, and a slide rail is provided in the rotating drum frame as a mounting position, and the magnetic field enhancement element can move along the slide rail;

When the driving part drives the lower rotating drum frame to rotate, the magnetic field enhancement element moves in the slide rail under the action of centrifugal force, so that two adjacent magnetic field enhancement elements collide and fit each other.

In one embodiment, an axial hole for connecting the driving part is provided on one end of the roller sleeve, and a clearance hole is provided on the other end of the roller sleeve, and the interface passes through the clearance hole.

In one embodiment, the interface includes a trumpet port, and the cross-sectional area of the trumpet port gradually decreases from the end surface of the rotating cartridge frame toward the clearance hole.

In one embodiment, the roller sleeve comprises a first half roller body and a second half roller body, and the first half roller body and the second half roller body are connected by closing so that the magnetic field generating device is accommodated between the first half roller body and the second half roller body.

In a second aspect, the present application provides a coating module, which applies a coating on a composite current collector, comprising: a gravure roller mechanism, wherein the outer surface of the gravure roller mechanism is located in a strong magnetic field;

A driving unit, the driving unit is used to drive the gravure roller mechanism to rotate;

The jet device is located above the gravure roller mechanism, and the jet device jets 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.

In one embodiment, the jetting device includes at least two air pumps, and the plurality of air pumps are arranged along the axial direction of the gravure roller mechanism.

In one embodiment, it further comprises two frames, the gravure roller mechanism is erected between the two frames, a support rod is rotatably connected between the frames, and a plurality of air pumps are installed on the support rod.

In one embodiment, a motor is built into the frame, and the motors in the two frames are connected to the two ends of the gravure roller mechanism.

In one embodiment, the gravure roller mechanism is located below the composite current collector, and the gravure roller mechanism is arranged tangentially to the composite current collector;

The jet device is arranged below the composite current collector, and the jet device jets non-polymerizable gas toward the tangent position between the gravure roller mechanism and the composite current collector.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without paying any creative work.

FIG. 1 is a perspective view of a coating module according to one or more embodiments;

FIG2 is a partial enlarged schematic diagram of point A in FIG1 ;

FIG3 is a cross-sectional view of a coating module according to one or more embodiments;

FIG4 is a front view of a coating module according to one or more embodiments;

5 is a perspective view of a gravure roller mechanism according to one or more embodiments;

6 is a cross-sectional view of a gravure roller mechanism at a first viewing angle according to one or more embodiments;

FIG7 is a partial enlarged schematic diagram of point B in FIG6;

8 is a cross-sectional view of a gravure roller mechanism at a second viewing angle according to one or more embodiments;

FIG. 9 is a partial enlarged schematic diagram of point C in FIG. 8 .

Detailed ways

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

In the process of battery preparation, it is necessary to enter the nano carbon coating process, that is, to apply the coating on the surface of the composite current collector and then heat it. The coating is formed by mixing a carbon material and a solution, wherein the carbon material includes conductive graphite, graphene or carbon nanotubes, etc. The carbon material in the coating can improve the conductivity and the binding force between the composite current collector and the positive electrode material or the negative electrode material. The coating method currently used is gravure coating, which rotates part of the gravure roller with smaller pits to the carbon coating equipment box containing the coating, and takes out the coating of the box through the pits, and then coats the coating on the composite current collector passing through the surface of the gravure roller to achieve coating printing on the surface of the substrate. However, when the coating is applied to the existing gravure roller, it is difficult for the coating to adhere tightly to the gravure roller, resulting in a lack of coating in some areas of the gravure roller, and the corresponding other part of the area is concentrated.

First, the paint is unevenly distributed due to differences in microscopic structure or curvature. The size and curvature of the pits on the gravure roller that hold the paint vary. When the paint is thinner, the viscosity of the paint decreases, making it more difficult for the paint to adhere to the gravure roller.

Secondly, the dust on the surface of the gravure roller will also cause the paint in some areas to be unable to adhere tightly to the surface of the gravure roller. When the dust is embedded in the pit, the curvature of the pit will be reduced, making it more difficult for the paint to adhere to the pit where the dust is embedded; or, when the paint adheres to the gravure roller, the area on the gravure roller where the dust is attached will fall off, resulting in no paint on the corresponding area.

If the coating cannot be tightly attached to the surface of the gravure roller, the coating tightly attached to the surface of the gravure roller will splash outward due to the centrifugal force when the gravure roller is rotated, or the coating will drip downward under the influence of its own gravity due to the adsorption force on the gravure roller, which will cause uneven coating on the gravure roller, and then make the coating on the composite current collector uneven. Not only will it affect the quality of the composite current collector, but it will also greatly waste raw materials. The spilled coating will also pollute the carbon coating equipment and affect the normal operation of the carbon coating equipment.

In some embodiments of the present application, with reference to FIG1 , the present application provides a coating module including a gravure roller mechanism, a driving unit and an air jet device 11. The gravure roller mechanism is located in a strong magnetic field; the driving unit is used to drive the gravure roller mechanism to rotate. The air jet device 11 sprays non-polymerizable gas toward the outer surface of the gravure roller mechanism, and the non-polymerizable gas is ionized by the strong magnetic field, and the plasma is connected (grafted) on the outer surface of the gravure roller mechanism. The outer surface of the gravure roller mechanism is given new properties by the plasma to improve the hydrophilicity of the outer surface of the gravure roller mechanism, and the coating can be more firmly attached to the outer surface of the gravure roller mechanism.

In this solution, the non-polymerizable gas ejected by the strong magnetic field ionization jet device 11 can form plasma polymers on the outer surface of the gravure roller mechanism, so that the outer surface of the gravure roller mechanism becomes hydrophilic, thereby improving the adsorption force of the gravure roller mechanism on the liquid, preventing the coating from being separated from the gravure roller mechanism due to centrifugal force and gravity when the gravure roller mechanism rotates, and preventing the coating from dripping or splashing out of a local area of the gravure roller mechanism, so as to ensure the uniformity of the coating on the gravure roller mechanism. In addition, the jet device 11 ejects gas toward the gravure roller mechanism, and the dust attached to the gravure roller mechanism can be blown away by the airflow ejected by the jet device 11, so as to play the role of cleaning the gravure roller mechanism.

The principle of plasma parallel connection (grafting) on the outer surface of the gravure roller mechanism to give the outer surface of the gravure roller mechanism new properties is: the non-polymerizable gas ejected by the 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 roller mechanism to give the surface of the gravure roller mechanism new properties, so that the surface of the gravure roller mechanism has hydrophilicity. The principle of plasma cross-linking on the gravure roller mechanism to give the surface of the gravure roller mechanism new properties is: the energy particles in the plasma can produce a cross-linking reaction with the surface of the gravure roller mechanism, generating polar groups, free radicals and other active groups on the surface of the gravure roller mechanism, and the plasma is highly cross-linked (grafted) on the gravure roller mechanism. The plasma polymer formed by plasma cross-linking (grafting) on the gravure roller mechanism has a network structure, so that the gravure roller mechanism has properties such as hydrophilicity, thermal stability, chemical stability, mechanical strength, membrane permeability, and biocompatibility. The grafted chain has stable chemical properties, and the copolymerization of plasma and the gravure roller mechanism will make the surface of the gravure roller mechanism hydrophilic.

With further reference to Figs. 2 and 4, the coating module also includes two frames 16, and the frames 16 include side plates 161. The gravure roller mechanism and the connecting rod 162 are mounted on the side plates 161, so that the gravure roller mechanism is mounted between the two frames 16. The driving unit is arranged in the frames 16. A support rod 112 is also rotatably connected between the frames 16, and the jet device 11 includes at least two air pumps 111, and a plurality of air pumps 111 are mounted on the support rod 112. The axial direction of the support rod 112 is arranged parallel to the axial direction of the gravure roller mechanism, so that the plurality of air pumps 111 are arranged along the axial direction of the gravure roller mechanism.

By using multiple air pumps 111 to spray towards different parts of the gravure roller mechanism, plasma polymers are formed evenly on the gravure roller mechanism to ensure that the surface of the gravure roller mechanism is hydrophilic, the coating attached to the gravure roller mechanism can be distributed more evenly, and the coating can be more firmly attached to the gravure roller mechanism during the rotation process, and the coating is not easy to fall off. Referring to Figure 3, the air pump 111 is provided with a nozzle 1111 for spraying, and the nozzle 1111 faces the gravure roller mechanism. In this scheme, the non-polymerizable gas can be selected from any one of He, Ar, _O2 , _CO2 , _NH3 , _H2 and the like. Due to the different densities of different types of non-polymerizable gases, the non-polymerizable gas sprayed from the air pump 111 has different spray routes. In order to ensure that the gas sprayed from the air pump 111 covers the surface of the gravure roller mechanism, the gas spray distance can be controlled by the air flow velocity sprayed from the air pump 111 or the spray angle of the nozzle 1111 toward the gravure roller mechanism. In a specific embodiment, the support rod 112 is rotatably connected to the frame 16, and the air pump 111 installed on the support rod 112 can rotate with the support rod 112. The rotation of the support rod 112 can adjust the spray angle of the nozzle 1111 toward the gravure roller mechanism, so that the air pump 111 can accurately spray to the gravure roller mechanism, and by adjusting the spray angle of the nozzle 1111, it is ensured that different non-polymerizable gases are accurately sprayed to the gravure roller mechanism.

In one embodiment, the jet device 11 is disposed above the gravure roller mechanism. And the box body in the carbon coating equipment is disposed below the gravure roller mechanism. The lower arc surface of the gravure roller mechanism is located in the box body, and the lower arc surface can bring out the coating in the box body. The air pump 111 faces the upper arc surface of the gravure roller mechanism, so that the non-polymerized gas falls on 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; and 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 as a new lower arc surface, and the original lower arc surface rotates to the top as a new upper arc surface.

When the coating module transmits the composite current collector, the composite current collector passes through the jet device 11 and is attached to the gravure roller mechanism. The composite current collector can be continuously carbon-coated on the gravure roller mechanism. At the same time, the jet device 11 continuously sprays gas toward the gravure roller mechanism. The composite current collector is arranged tangentially to the gravure roller mechanism. The gravure roller mechanism is below the composite current collector, and the jet device 11 is also located below the composite current collector. The jet device 11 sprays gas toward the tangential position between the gravure roller mechanism and the composite current collector, so that the plasma ionized by the strong magnetic field on the gravure roller mechanism can also be cross-linked to the composite current collector, thereby simultaneously giving new properties to the composite current collector material and the surface of the gravure roller mechanism.

In some embodiments of the present 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 pits, and the coating can be contained in the pits, and the roller sleeve 12 is hollow. The magnetic field generating device 15 is arranged in the hollow space of the roller sleeve 12, and the surface of the roller sleeve 12 forms a strong magnetic field for ionizing the non-polymerizable gas through the magnetic field generating device 15.

In one embodiment, referring to FIGS. 5 and 6 , the magnetic field generating device 15 includes a microwave generator 151 and at least two magnetic field enhancing elements 153, and the magnetic field enhancing elements 153 are arranged circumferentially outside the microwave generator 151. The microwaves generated by the microwave generator 151 are trapped in the magnetic field enhancing element 153, and the microwaves of at least one wavelength trapped in the magnetic field enhancing element 153 can be reflected at the edge of the magnetic field enhancing element 153, forming a standing wave inside the magnetic field enhancing element 153, and the standing wave in the magnetic field enhancing element 153 can form a magnetic field through resonance, and the closer to the center position of the magnetic field enhancing element 153, the stronger the magnetic field intensity. When two adjacent magnetic field enhancing elements 153 are close to each other to fit or are close to fit, the magnetic fields in the magnetic field enhancing elements 153 will attract each other and close together, and the maximum magnetic field in the magnetic field enhancing element 153 will shift from the center position of the magnetic field enhancing element 153 to the position where the two magnetic field enhancing elements 153 fit together, so that the magnetic fields are superimposed to form a strong magnetic field, and the strong magnetic field will spread to the outer surface of the roller sleeve 12. When the non-polymerizable gas is directed toward the roller sleeve 12 through the strong magnetic field, the non-polymerizable gas is first ionized into plasma in contact with the strong magnetic field, and the plasma can approach the roller sleeve 12 and cross-link on the surface of the roller sleeve 12 .

It should be pointed out that, in this embodiment, at least two groups of magnetic field enhancement elements 153 form the same number of strong magnetic fields. Since the magnetic field enhancement elements 153 are arranged on the circumferential outside of the microwave generator 151, multiple strong magnetic fields are circumferentially arranged on the outside of the microwave generator 151, and the multiple strong magnetic fields are located at different positions of the roller sleeve 12.

Wherein, when two adjacent magnetic field enhancement elements 153 are fitted, the outer walls of the two adjacent magnetic field enhancement elements 153 are tangent to each other; and when the two adjacent magnetic field enhancement elements 153 are approximately fitted, the interval between the two adjacent magnetic field enhancement elements 153 is less than one microwave wavelength. When the interval between the two adjacent magnetic field enhancement elements 153 is close enough, the magnetic fields in the two magnetic field enhancement elements 153 can interact with each other and then attract each other, so that the two magnetic fields are superimposed to increase the magnetic induction intensity, that is, to form a strong magnetic field.

In this solution, the magnetic fields in two adjacent magnetic field enhancement elements 153 are superimposed on each other to increase the strength of the magnetic field, and the roller sleeve 12 is located in the magnetic field to achieve the purpose of ionizing the gas. Since the magnetic field generating device 15 is contained in the roller sleeve 12, it is avoided to set a magnetic field generating device outside the gravure roller structure. In this solution, the gravure roller structure is more compact, redundant parts are avoided, and the floor space of the coating module is reduced. At the same time, the roller sleeve 12 is coated on the periphery of the magnetic field generating device 15. The magnetic field generating device 15 is coated by the roller sleeve 12 to avoid collision with the magnetic field generating device 15, better protect the magnetic field generating device 15, and thus extend the service life of the magnetic field generating device 15.

On the other hand, microwaves are reflected in the magnetic field enhancement element 153, and the magnetic field strength at the center of the magnetic field enhancement element 153 is the largest. At the same time, the standing wave in the magnetic field enhancement element 153 can also increase heat through resonance. More specifically, the heat in the magnetic field enhancement element 153 will be concentrated at the center, so that the temperature increase at the center of the magnetic field enhancement element 153 is the largest. This principle is similar to that of a microwave oven. The temperature increase position in the magnetic field enhancement element 153 is associated with the position where the magnetic field in the magnetic field enhancement element 153 increases, that is, the higher the magnetic field strength in the magnetic field enhancement element 153, the higher the temperature increase. When the two magnetic field enhancement elements 153 are attached together, the magnetic field of the magnetic field enhancement element 153 will be offset and concentrated on the contact point of the two magnetic field enhancement elements 153. At the same time, the heat in the magnetic field enhancement element 153 will also be concentrated at the contact point of the two magnetic field enhancement elements 153. The heat is more likely to diffuse outward from the magnetic field enhancement element 153, thereby causing the surface temperature of the roller sleeve 12 to rise. Since the coating on the surface of the composite current collector in the nano-carbon coating process also needs to be heated, and the heating module needs to be heated for a period of time to raise the composite current collector to a predetermined temperature. In the present embodiment, the heat on the roller sleeve 12 is transferred to the composite current collector, which can preheat the composite current collector so that the composite current collector can rise to the temperature required by the carbon coating process more quickly, thereby improving the carbon coating efficiency.

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 microwaves in the magnetic field enhancement element 153. In this solution, since the transmission speed of microwaves in the magnetic field enhancement element 153 is related to the material of the magnetic field enhancement element 153, specifically, if the transmission speed of microwaves in the magnetic field enhancement element 153 is reduced, the wavelength of microwaves in the magnetic field enhancement element 153 will also be shortened. 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 the requirement that the diameter of the magnetic field enhancement element 153 is not less than one wavelength of the microwave in the magnetic field enhancement element 153 to achieve the purpose of forming a magnetic field by microwave reflection resonance in the magnetic field enhancement element 153.

In one embodiment, the diameter of the magnetic field enhancement element 153 is equal to the wavelength of the microwave. The microwaves inside the magnetic field enhancement element 153 are reflected at the edge of the magnetic field enhancement element 153 to form a magnetic field. The microwaves generated by the microwave generator 151 can diffuse into the magnetic field enhancement element 153, and microwaves of a wavelength are trapped in the magnetic field enhancement element 153. The microwaves in the magnetic field enhancement element 153 will be reflected at the edge, and the reflected microwaves will form standing waves inside the magnetic field enhancement element 153. The standing waves form a magnetic field at the center of the magnetic field enhancement element 153 through resonance.

Among them, the materials of the magnetic field enhancement element 153 and the roller sleeve 12 are high temperature resistant inorganic materials, so that microwaves or magnetic fields can diffuse into the magnetic field enhancement element 153 and the roller sleeve 12, so that microwaves enter the magnetic field enhancement element 153 or strong magnetic fields pass through the roller sleeve 12 and there is a strong magnetic field on the outer surface of the roller sleeve 12. At the same time, when the magnetic field enhancement element 153 and the roller sleeve 12 made of high temperature resistant inorganic materials are ionized, the magnetic field enhancement element 153 and the roller sleeve 12 can ensure stability and avoid damage. Since the magnetic field enhancement element 153 and the roller sleeve 12 will generate a lot of heat when ionized, the temperature of the magnetic field enhancement element 153 and the roller sleeve 12 will rise sharply. In order to avoid the magnetic field enhancement element 153 and the roller sleeve 12 from affecting its stability due to the temperature rise, the magnetic field enhancement element 153 and the roller sleeve 12 in this solution are made of inorganic materials.

Furthermore, the magnetic field enhancement element 153 is in a roller shape, and the length of the magnetic field enhancement element 153 is consistent with the length of the microwave generator 151, and the microwave generated in the microwave generator 151 can be transmitted to the magnetic field enhancement element 153 located around the microwave generator 151. When the circular outer contours of two adjacent magnetic field enhancement elements 153 are in contact, the two magnetic field enhancement elements 153 are tangently arranged so that the magnetic field enhancement elements 153 are in contact at the tangent point, and the magnetic fields in the two magnetic field enhancement elements 153 are offset to the tangent point, and the two magnetic fields are more concentrated so that the strong magnetic field formed after the magnetic field superposition is stronger.

It is understandable that the shape of the magnetic field enhancement element 153 includes but is not limited to a roller shape, and the magnetic field enhancement element 153 can also be selected as a spherical shape. If the magnetic field enhancement element 153 adopts a spherical structure, for example, multiple magnetic field enhancement elements 153 arranged circumferentially on the microwave generator 151 constitute a magnetic field enhancement element subset, the number of the magnetic field enhancement element subsets is at least two, and the magnetic field enhancement element subsets are arranged along the axis of the roller sleeve 12. At the same time, two adjacent magnetic field enhancement element subsets need to be separated to avoid the magnetic field enhancement elements 153 in the two magnetic field enhancement element subsets from contacting each other, so that the magnetic field enhancement elements 153 in each magnetic field enhancement element subset independently generate a magnetic field superposition effect, and through multiple groups of magnetic field enhancement 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, so that the strong magnetic field distribution on the roller sleeve 12 is more uniform.

In some embodiments of the present application, a rotating drum frame 152 is further provided between the roller sleeve 12 and the magnetic field generating device 15, and a magnetic field enhancing element 153 is installed on the rotating drum frame 152. The rotating drum frame 152 is a cylindrical structure, the microwave generator 151 is arranged in the hollow interior of the rotating drum frame 152, and the roller sleeve 12 is covered on the outside of the rotating drum frame 152. In addition, a mounting position for the magnetic field enhancing element 153 is provided on the rotating drum frame 152, and the magnetic field enhancing element 153 is limited to the rotating drum frame 152 by installing the magnetic field enhancing element 153 on the mounting position.

In one embodiment, the magnetic field enhancement element 153 is fixed on the rotating drum frame 152 so that the outer walls of two adjacent magnetic field enhancement elements 153 are tangent to each other 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 .

In another embodiment, referring to FIG7 , a slide rail 1522 for accommodating the magnetic field enhancement element 153 is provided in the rotating drum frame 152, and the magnetic field enhancement element 153 can move along the slide rail 1522. The driving unit can not only drive the roller sleeve 12 to rotate, but also drive the rotating drum frame 152 to rotate. When the driving unit drives the rotating drum frame 152 to rotate, the magnetic field enhancement element 153 slides relative to the rotating drum frame 152 under the influence of centrifugal force, so that the magnetic field enhancement element 153 is constantly swung and collides with each other. In this process, some of the magnetic field enhancement elements 153 gradually approach each other so that the microwaves in the magnetic field enhancement element 153 resonate.

Further, as shown in Fig. 5 and Fig. 6, the roller sleeve 12 comprises two oppositely disposed first end faces 123 and second end faces 124, wherein an axial hole 1231 is disposed on the first end face 123, and the output shaft of the driving unit is connected in the axial hole 1231 to drive the roller sleeve 12 to rotate. At the same time, an interface is disposed at one end of the rotating drum frame 152, and the interface is used to connect the driving unit.

Exemplarily, the microwave generator 151, the rotating drum frame 152 and the roller sleeve 12 are arranged in concentric circles. The microwave generator 151, the rotating drum frame 152 and the roller sleeve 12 are arranged with clearance fit between each other. As shown in Figure 1, the driving part includes a first motor 13 and a second motor 14, and the first motor 13 and the second motor 14 are correspondingly accommodated in two frames 16. Among them, 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 interface, so that the roller sleeve 12 can rotate relative to the rotating drum frame 152.

The following problems were found during use: the driving unit drives the rotating drum frame 152 and the roller sleeve 12 to move synchronously, so the magnetic field strength on the surface of the roller sleeve 12 will remain unchanged, and the roller sleeve 12 is used to transmit the composite current collector, and the composite current collector is continuously transmitted forward by the roller sleeve 12. The driving unit needs to drive the roller sleeve 12 to maintain unidirectional rotation to achieve unidirectional transmission. At the same time, the rotating drum frame 152 is driven by the roller sleeve 12 to rotate unidirectionally, so the magnetic field enhancement element 153 will eventually tend to keep the rotating drum frame 152 still under the action of centrifugal force, resulting in the magnetic field strength formed between the magnetic field enhancement elements 153 remaining unchanged, so that the hydrophilic property of the surface of the roller sleeve 12 remains unchanged.

It is understandable that the hydrophilicity of the roller sleeve 12 needs to match the product film material and coating components on the surface of the composite current collector. Generally speaking, the greater the magnetic field intensity, the greater the ionized gas energy, and the better the hydrophilicity of the roller sleeve 12 surface. However, if the hydrophilicity is too good, the force of the coating adsorbed on the surface of the roller sleeve 12 is too large, which will make it difficult to transfer the coating to the product film, affecting the coating effect. Based on this, the magnetic field intensity on the surface of the roller sleeve 12 needs to be adapted to the product film material and coating components. A single magnetic field intensity will be difficult to meet the needs of different product film materials and coating components on the surface of the composite current collector. For example, when the coating is thinner, a stronger magnetic field is required on the roller sleeve 12; and when the coating is thicker, only a weaker magnetic field is required on the roller sleeve 12.

Therefore, in this solution, the rotating drum frame 152 is driven by an independent second motor 14, so as to control the rotating drum frame 152 to adjust the rotation speed and rotation direction, so that the magnetic field enhancement elements 153 are continuously separated and collided during the rotation of the rotating drum frame 152, thereby controlling the magnetic field strength on the roller sleeve 12. At the same time, the magnetic field enhancement elements 153 are acted upon by centrifugal force, and a single set of magnetic fields is formed between the magnetic field enhancement elements 153, so that the strong magnetic field covers the roller sleeve 12 more uniformly. Among them, the roller sleeve 12 and the rotating drum frame 152 can rotate at different speeds, so that the same position of the roller sleeve 12 can be covered by different strong magnetic fields. For example, the rotation speed of the roller sleeve 12 is faster than that of the rotating drum frame 152, so that a single strong magnetic field can pass through more areas of the outer surface of the roller sleeve 12, thereby utilizing the strong magnetic field to cross-link plasma on a larger area of the outer surface of the roller sleeve 12. As the rotating drum frame 152 rotates, the magnetic field enhancement elements 153 can be more evenly distributed on the inner wall of the roller sleeve 12 under the action of centrifugal force, so that the areas covered by each strong magnetic field do not overlap, and when the ionization area of the strong magnetic field is expanded, the overlap of the ionization areas of each magnetic field is avoided, thereby ensuring the uniformity of the cross-linked plasma of the roller sleeve 12 and improving the ionization efficiency of the strong magnetic field.

In addition, if the rotating drum frame 152 does not rotate, the magnetic field enhancement element 153 is gathered at the bottom of the rotating drum frame 152 under the influence of its own gravity, which causes the magnetic field on the roller sleeve 12 to be concentrated at the bottom of the roller sleeve 12, making the magnetic field on the roller sleeve 12 uneven. In order to improve the hydrophilicity of the composite current collector surface, the magnetic field on the roller sleeve 12 also needs to cross-link the plasma on the composite current collector surface on the roller sleeve 12. 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 then affect the efficiency of plasma cross-linking (grafting) to the composite current collector.

When the rotating drum frame 152 rotates, the magnetic field enhancing element 153 moves on the slide rail 1522 in the rotating drum frame 152, which makes the magnetic field on the roller sleeve 12 more evenly distributed compared to when the rotating drum frame 152 does not rotate, thereby making the hydrophilicity of the surface of the roller sleeve 12 more uniform, thereby increasing the magnetic field strength in the top area of the roller sleeve 12 and the magnetic field ionization efficiency in the top area of the roller sleeve 12, so as to facilitate plasma cross-linking on the surface of the composite current collector.

Exemplarily, the slide rail 1522 in the rotating drum frame 152 is a closed cavity, and the magnetic field enhancement element 153 is accommodated in 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 in the two magnetic field enhancement elements 153 when two adjacent magnetic field enhancement elements 153 are attached. The filled inert gas can prevent the magnetic field enhancement element 153 from being damaged by ionization, thereby extending the service life of the magnetic field enhancement element 153.

Further, as shown in FIG5 and with reference to FIG9, a clearance hole 1241 is provided on the other end of the roller sleeve 12 (i.e., the second end face 124), and the interface passes through the clearance hole 1241. Among them, a horn port 1521 as an interface is provided on one end of the rotating drum frame 152, and the horn port 1521 extends outward from the end face of the rotating drum frame 152 along the axis direction of the rotating drum frame 152, and the horn port 1521 extends out of the second end face 124. As shown in FIG2, a shaft sleeve 17 is provided between the second end face 124 and the second motor 14, and the horn port 1521 is connected to the output shaft of the second motor 14 through the shaft sleeve 17. Exemplarily, the cross-sectional area of the horn port 1521 gradually decreases along the extension direction, so that the horn port 1521 can be plugged into the shaft sleeve 17. At the same time, the horn port 1521 is hollow inside. When the roller sleeve 12 and the rotating drum frame 152 rotate, the microwave generator 151 spaced apart from the rotating drum frame 152 remains stationary, and the power line of the microwave generator 151 extends out of the gravure roller structure through the hollow of the horn port 1521 to avoid the problem of the power line of the microwave generator 151 being entangled due to rotation. It should be pointed out that the microwave generator 151 is not limited to being connected to the external AC power supply through the power line, and can also be powered by a DC power supply such as a battery, and the battery is contained in the gravure roller structure, which can also avoid the problem of wire entanglement. A wireless transmitter module and a wireless receiver module can also be configured by powering the battery, and the wireless transmitter module sends a command signal of working or pausing to be transmitted to the wireless receiver module via a medium, and the wireless receiver module controls whether the battery supplies power to the microwave generator 151 according to the command signal of working or pausing, so as to realize the switch of the microwave generator 151.

In some embodiments of the present application, as shown in FIG5 , the roller cover 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 cover 12, and the first half roller body 121 and the second half roller body 122 are used to facilitate disassembly and assembly. After the magnetic field generating device 15 is installed in the first half roller body 121 or the second half roller body 122, the other half of the roller cover 12 is assembled, thereby completing the assembly steps of the gravure roller structure, so as to facilitate the disassembly and assembly of the gravure roller structure for repair and maintenance.

The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

A gravure roller mechanism, characterized by comprising:

A roller sleeve (12), wherein the roller sleeve (12) is hollow inside; and

A magnetic field generating device (15) housed in the roller sleeve (12);

The magnetic field generating device (15) comprises a microwave generator (151) and at least two magnetic field enhancing elements (153); the magnetic field enhancing elements (153) are arranged circumferentially outside the microwave generator; the microwave generator (151) emits microwaves toward the circumferential magnetic field enhancing elements (153); the microwaves in the magnetic field enhancing elements (153) are reflected to form a magnetic field in the magnetic field enhancing elements (153);

Two adjacent magnetic field enhancement elements (153) are in close contact with each other or are close to each other and are approximately in close contact with each other, so that the magnetic fields in the two magnetic field enhancement elements (153) are combined and superimposed to form a strong magnetic field, and the roller sleeve (12) is located in the strong magnetic field.
The gravure roller mechanism according to claim 1, characterized in that the diameter of the magnetic field enhancement element (153) is not less than the wavelength of the microwaves generated by the microwave generator (151).
The gravure roller mechanism according to claim 2 is characterized in that outer walls of two adjacent magnetic field enhancement elements (153) are arranged tangentially.
The gravure roller mechanism according to claim 2 is characterized in that a rotating drum frame (152) is further provided between the roller sleeve (12) and the microwave generator (151), and the magnetic field enhancement element (153) is mounted on the rotating drum frame (152).
The gravure roller mechanism according to claim 4 is characterized in that the microwave generator (151), the rotating drum frame (152) and the roller sleeve (12) are arranged in concentric circles.
The gravure roller mechanism according to claim 4 is characterized in that the rotating drum frame (152) is provided with a mounting position for the magnetic field enhancing element (153), and the magnetic field enhancing element (153) is installed in the mounting position so that the magnetic field enhancing element (153) is limited on the rotating drum frame (152).
The gravure roller mechanism according to claim 6 is characterized in that an interface is provided at one end of the rotating drum frame (152), the interface is used to connect the driving unit, a slide rail (1522) is provided in the rotating drum frame (152) as the mounting position, and the magnetic field enhancement element (153) can move along the slide rail (1522);

The rotating drum frame (152) rotates under the driving of the driving unit, and the magnetic field enhancement elements (153) move in the slide rail (1522) under the action of centrifugal force, so that two adjacent magnetic field enhancement elements (153) collide and fit with each other.
The gravure roller mechanism according to claim 7 is characterized in that an axial hole (1231) for connecting the driving part is provided on one end of the roller sleeve (12), and a clearance hole (1241) is provided on the other end of the roller sleeve (12), and the interface passes through the clearance hole (1241).
The gravure roller mechanism according to claim 8 is characterized in that the interface comprises a trumpet port (1521), and the cross-sectional area of the trumpet port (1521) gradually decreases from the end face of the rotating drum frame (152) toward the clearance hole (1241).
The gravure roller mechanism according to any one of claims 1 to 9 is characterized in that the roller sleeve (12) comprises a first half roller body (121) and a second half roller body (122), and the first half roller body (121) and the second half roller body (122) are connected by closing so that the magnetic field generating device (15) is accommodated between the first half roller body (121) and the second half roller body (122).
A coating module, which applies a coating on a composite current collector, is characterized in that it comprises: a gravure roller mechanism, wherein the outer surface of the gravure roller mechanism is located in a strong magnetic field;

A driving unit, the driving unit is used to drive the gravure roller mechanism to rotate;

An air jet device (11) is located above the gravure roller mechanism, and the air jet device (11) jets 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.
The coating module according to claim 11 is characterized in that the 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 roller mechanism.
The coating module according to claim 12 is characterized in that it also includes two frames (16), the gravure roller mechanism is mounted between the two frames (16), and a support rod (112) is rotatably connected between the frames (16), and a plurality of the air pumps (111) are mounted on the support rod (112).
The coating module according to claim 13 is characterized in that the frame (16) has a built-in motor, and the motors in the two frames (16) are connected to the two ends of the gravure roller mechanism.
The coating module according to any one of claims 11 to 14, characterized in that the gravure roller mechanism is located below the composite current collector, and the gravure roller mechanism is arranged tangentially to the composite current collector;

The jetting device (11) is arranged below the composite current collector, and the jetting device (11) jets non-polymerizable gas toward a tangential position between the gravure roller mechanism and the composite current collector.