Coating device and production system

Abstract

The invention discloses a film coating device and a production system, the film coating device is used for preparing a film coating product, the film coating product comprises a base material and a metal film, and the film coating device comprises: a cooling assembly comprising at least one magnetic field generating part for providing a magnetic field; and the current generation assembly is used for enabling current to pass through the coated product, so that the Ampere force applied to the coated product in the magnetic field points to the cooling assembly. After the metal film of the coated product is electrified, the metal film can be approximately regarded as an electrified conductor, and the electrified conductor is subjected to Ampere force in a magnetic field. Compared with the mode that electrostatic adsorption force is attached to the cooling assembly, the Ampere force is large, and the coated product can be attached to the cooling assembly more tightly. In this way, the surface of the prepared coated product is smoother, cooling is more uniform through the cooling assembly, the film surface is not prone to damage, and therefore the probability of film surface deformation can be reduced, and the yield of the coated product is increased.

Description

Technical Field

[0001] The present application relates to the technical field of evaporation coating, and in particular to a coating device and a production system. Background Art

[0002] At present, the evaporation process is widely used in the field of lithium batteries. For example, the evaporation process is often used to prepare a composite current collector with a three-layer composite structure of "metal-substrate-metal".

[0003] The evaporation process for coating products like composite current collectors is generally as follows: the coating product is placed on the surface of a cooling drum, which cools the coating product. High-temperature metal vapor generated by an electron gun irradiating the target material cools on the surface of the coating product, forming a thin film several nanometers thick. Repeated evaporation ultimately produces a coating product with a metal film thickness of several microns.

[0004] However, during the actual vapor deposition process, the film surface of the coated product is prone to deformation such as damage or wrinkles, resulting in a low yield of the coated product.

[0005] Therefore, how to improve the yield of coated products is a technical problem that needs to be solved urgently. Summary of the Invention

[0006] In view of the above problems, the present application provides a coating device and a production system to improve the yield of coating products.

[0007] In a first aspect, the present application provides a coating device for preparing a coated product, wherein the coated product includes a substrate and a metal film, and the coating device includes:

[0008] A cooling component is used to cool the coated product, wherein the cooling component includes at least one magnetic field generating component for providing a magnetic field so that the coated product is located in the magnetic field; and a current generating component for passing current through the coated product so that the direction of the Ampere force exerted on the coated product in the magnetic field is directed toward the cooling component.

[0009] When energized, a coated product can be roughly considered a charged conductor, which in a magnetic field is subject to the Ampere force. Because the Ampere force acting on the coated product is directed toward the cooling assembly, the coated product can fit tightly against the cooling assembly, with minimal or no gap between them. This allows the cooling assembly to evenly cool all areas of the coated product, thereby reducing the likelihood of film surface deformation and improving the yield of the coated product.

[0010] Furthermore, the electrostatic attraction method, which allows the coated product to adhere to the cooling element, results in a gap between the coated product and the cooling element due to the weak electrostatic force. Consequently, the cooling element does not cool the coated product to a great extent. Therefore, when high-temperature metal vapor reaches the coated product, the film surface is easily damaged by the heat. However, the Ampere force in this solution is greater, allowing the coated product to adhere tightly to the cooling element, thereby reducing the possibility of film deformation and improving the yield of the coated product.

[0011] In addition, when the coated product is pulled and attached to the cooling component during transportation, the force on the coated product is concentrated at the position where the coated product is pulled, and the force on the coated product is uneven, which easily causes wrinkles. These wrinkles make the gap between the coated product and the cooling component vary in size. The part where the wrinkles are raised and attached to the cooling component can be effectively cooled, while the part where the wrinkles are sunken or blocked by other wrinkles and cannot fit tightly to the cooling component has a smaller cooling range. Therefore, when the high-temperature metal vapor reaches the coated product, the film surface of the coated product is easily damaged by heat. The coated product under the action of Ampere force in this solution can fit the cooling component more evenly and smoothly, reducing the probability of deformation of the film surface of the coated product and improving the yield of the coated product.

[0012] In some embodiments, the current generating assembly includes at least one first roller and a second roller corresponding to the first roller. The first roller and the second roller are charged with opposite polarities. Therefore, when a coated product is connected to the first roller and the second roller to form a current path between the rollers, the current between the first roller and the corresponding second roller flows through the coated product.

[0013] In some embodiments, a plurality of first rollers are arranged along a first direction, a plurality of second rollers are arranged along a second direction, the first direction is parallel to the second direction, and the first direction and the second direction are parallel to the surface of the coated product, the first direction intersects with the direction of the magnetic field and the first direction is parallel to the surface of the coated product.

[0014] With this arrangement, the first and second rollers are positioned opposite each other, with each first roller positioned at an equal distance from the surface of the coated product, and each second roller positioned at an equal distance from the surface of the coated product. The coated product contacts the first and corresponding second rollers, forming a current path. This can generate multiple currents on the coated product, allowing the coated product to be approximately viewed as multiple charged conductors subjected to the Ampere force. Furthermore, because the rollers are arranged in a direction that intersects the magnetic field, the Ampere force acting on the coated product is non-zero.

[0015] In some embodiments, since the spacing between any adjacent first rollers is equal to the spacing between any adjacent second rollers, multiple evenly distributed currents can be formed on the coated product, so that the coated product is subjected to evenly distributed Ampere forces, thereby making the coated product fit tightly to the cooling component, making the surface smoother and more evenly cooled, thereby improving the yield of the coated product.

[0016] In some embodiments, the current generating component is disposed in contact with the metal film, such that the metal film is charged and can be considered as a charged conductor.

[0017] In some embodiments, the magnetic field generating component comprises a conductive coil or a magnet.

[0018] In some embodiments, the cooling assembly includes a accommodating cavity for accommodating multiple magnetic field generating components, wherein the multiple magnetic field generating components are arranged in layers along the radial direction of the accommodating cavity, the multiple magnetic field generating components in each layer are arranged along the circumferential direction of the accommodating cavity, and there are gaps between adjacent magnetic field generating components in each layer, and the gaps between two adjacent layers are arranged in an staggered manner.

[0019] In some embodiments, the direction of the current on the coated product is perpendicular to the direction of the magnetic field, so that when the current magnitude and the magnetic induction intensity are the same, the Ampere force on the coated product is the largest.

[0020] In some embodiments, the magnetic field generating component is a conductive coil. Accordingly, the coating device also includes a power supply component for adjusting the current of the conductive coil to adjust the magnetic induction intensity, and thus the magnitude of the magnetic induction intensity can be adjusted according to actual production needs.

[0021] In a second aspect, the present application further provides a production system, which includes any coating device as described in the first aspect. For example, the production system can be a composite current collector production line equipped with a coating system, or other production lines requiring an evaporation process.

[0022] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0024] Figure 1 Schematic diagram of an application of a coating device;

[0025] Figure 2 This is a schematic structural diagram of a coating device according to some embodiments of the present application;

[0026] Figure 3 This is a schematic diagram of the forces acting on the coating products of some embodiments of the present application;

[0027] Figure 4 This is a schematic structural diagram of a current generating component in some embodiments of the present application;

[0028] Figure 5 Schematic diagram of the structure of the current generating component of some other embodiments of the present application;

[0029] Figure 6a Schematic diagram of the arrangement of coating devices and coating products in some embodiments of the present application;

[0030] Figure 6b Schematic diagrams of the arrangement of coating devices and coating products in other embodiments of the present application;

[0031] Figure 7a This is a front view schematic diagram of a coating device according to some embodiments of the present application;

[0032] Figure 7b Schematic diagrams of the front view of coating devices according to other embodiments of the present application;

[0033] Figure 8 This is a schematic diagram of the application of the power supply assembly in some embodiments of the present application;

[0034] Figure 9 This is a schematic structural diagram of a production system according to some embodiments of the present application. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0037] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0038] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0040] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0041] To facilitate understanding of the solution in this application, the background technology of this application is explained below:

[0042] Metallized composite current collectors currently hold broad application prospects in the new energy sector. Composite current collectors comprise a three-layer structure of "metal-substrate-metal," typically formed by depositing a nanoscale metal film on the substrate surface using evaporative coating.

[0043] The evaporation process for coating products like composite current collectors is generally as follows: the coating product is placed on the surface of a cooling drum, which cools the coating product. High-temperature metal vapor generated by an electron gun irradiating the target material cools on the surface of the coating product, forming a thin film several nanometers thick. Repeated evaporation ultimately produces a coating product with a metal film thickness of several microns.

[0044] However, in the actual evaporation process, the metal vapor temperature is too high, and the film surface of the coated product is easily deformed by heat, such as the film surface is damaged, resulting in a low yield of the coated product; or Figure 1 As shown, the coated product 101 (including the substrate 1011 and the metal film 1012) is cooled by the cooling drum 102 and the roller ( Figure 1Under the traction of the film (shown as rollers 1031 and 1032), the film surface is prone to deformation such as wrinkles, which will also lead to a low yield of the coated product.

[0045] Therefore, how to improve the yield of coated products is a technical problem that needs to be solved urgently.

[0046] Researchers investigated the aforementioned technical issues and, on one hand, believed that the metal vapor temperature was too high, or that the substrate 1011 and metal film 1012 materials had poor heat resistance, leading to thermal damage to the film surface of the coated product 101. While maintaining the performance of the coated product 101, the researchers lowered the metal vapor temperature by reducing the electron beam intensity, or replaced the substrate 1011 and metal film 1012 materials with more heat resistance. However, they found that the coated product 101 still experienced film damage, such as pinhole-shaped cracks.

[0047] On the other hand, the researchers believe that the coating product 101 may be stretched and reduced in thickness by the traction force when it is pulled by the cooling drum 102 and the roller, making it susceptible to heat damage when in contact with high-temperature metal vapor. In addition, the traction force of the cooling drum 102 and the roller is concentrated at the point where the cooling drum 102 and the roller contact the coating product 101. The uneven distribution of force makes the film surface of the coating product 101 susceptible to deformation such as wrinkles. Therefore, the researchers tried to reduce the traction force by reducing the rotation speed of the cooling drum 102 and the roller, and changing the relative position between the cooling drum 102 and the roller. However, this seriously affected the normal production cycle of the coating product 101, and still did not significantly improve the problem of film surface deformation of the coating product 101.

[0048] After the above attempts, the researchers conducted repeated experiments and found that the electrostatic adsorption of the coated product 101 to the cooling drum 102 is weak, and there is a certain gap between the coated product 101 and the cooling drum 102, resulting in a small cooling range of the coating product 101 by the cooling drum 102. Therefore, when the high-temperature metal vapor reaches the coated product 101, the film surface of the coating product 101 is easily damaged by heat.

[0049] In addition, through Figure 1The tension generated by the cooling drum 102 and the rollers that convey the coated product 101 is shown to fit the coated product 101 to the cooling drum 102. Since the force on the coated product 101 is concentrated at the position where the coated product 101 is pulled, the uneven pulling force on the coated product 101 is prone to deformation such as wrinkles. These wrinkles cause the gaps between the coated product 101 and the cooling drum 102 to vary in size. The parts where the wrinkles are raised and fit the cooling drum 102 have a larger cooling amplitude, while the parts where the wrinkles are sunken or blocked by other wrinkles and fail to fit tightly to the cooling drum 102 have a smaller cooling amplitude. Therefore, when the high-temperature metal vapor reaches the coated product, the areas of the coated product 101 with a smaller cooling amplitude are prone to heat damage.

[0050] The present application provides a coating device to improve the yield of coated products. The coating device in the present application refers to a device for coating a metal film on the surface of a substrate. The coating device is generally composed of a vacuum chamber, an electron gun, and a conveying device. In the vacuum chamber, the substrate is placed on the conveying device, and the electron gun emits an electron beam to evaporate and melt the target material to form metal vapor, which is deposited on the surface of the substrate to form a metal film. The coating device in the present application can be integrated into an electron gun evaporation machine, an electron beam evaporation vacuum chamber, or other evaporation systems.

[0051] In addition, the coating device of the present application is used to prepare coating products, which refer to products with metal thin films coated on the surface of the substrate, such as composite current collectors, optical components, wafers, etc. Figure 2 As shown, the coated product 101 in the present application includes a substrate 1011 and a metal film 1012 (the present application shows that the metal film 1012 is coated on one side of the substrate 1011. Of course, the other side of the substrate 1011 can also be coated with a metal film to form a three-layer composite structure). The substrate 1011 in the present application refers to the basic material used to support and carry other materials during the coating process, including but not limited to flexible materials such as polypropylene, polyethylene terephthalate, polyethylene and other materials. The metal film 1012 in the present application refers to a thin film made of metal or alloy material, and its thickness ranges from a few nanometers to a few microns.

[0052] It should also be noted that since the thickness of the metal film required for the preparation of the composite current collector is generally in the micron range, and in the actual evaporation process, the metal film formed by each evaporation is only tens of nanometers, it is necessary to repeatedly coat the film to deposit the metal film to the required thickness. In addition, in the general coating process of the composite current collector, a base metal layer is evaporated and sputtered to enhance the adhesion. Therefore, during the coating process, as long as the surface of the substrate has been coated with a metal film, the coating device provided by the present application can be used to make the coated product fit tightly with the cooling component, reduce the probability of deformation of the film surface of the coated product, and improve the product yield.

[0053] The coating device provided by this application is described below. Figure 2As shown, the coating device 20 includes a cooling component 201 and a current generating component 202. The cooling component 201, also called a cooling drum or cooling roller, is a device composed of multiple components and mainly used to reduce the temperature of the device or product. The current generating component 202 is a device composed of multiple components and mainly used to generate current.

[0054] The cooling component 201 includes at least one magnetic field generating component (shown as magnetic field generating component C1-magnetic field generating component Cn in the drawings of this application), and the at least one magnetic field generating component is used to provide a magnetic field B so that the coated product 101 is located in the magnetic field B.

[0055] It should be noted that the dotted magnetic flux lines in the drawings of this application represent magnetic field B. Magnetic flux lines are closed curves used to describe the distribution of magnetic field B and do not actually exist. The tangent direction of any point on a magnetic flux line is the same as the direction of magnetic field B at that point. Magnetic field B in this application refers to the field that transmits magnetic forces between physical objects. In this application, "locating the coated product 101 in magnetic field B" means locating part or all of the coated product in magnetic field B.

[0056] For example, Figure 2 As shown, the cooling assembly 201 also includes a cooling component 2012, which is used to cool the coated product 101. The cooling component 2012 may include a housing and a liquid cooling pipe disposed within the housing. The housing is generally cylindrical to facilitate transport of the coated product. When the coated product needs to be cooled, liquid circulates in the liquid cooling pipe, cooling the housing of the cooling assembly 201, and thus the coated product attached to the housing.

[0057] The current generating component 202 is used to pass current through the coated product 101 so that the direction of the Ampere force F exerted on the coated product 101 in the magnetic field B points toward the cooling component 201 .

[0058] It should be noted that, when the substrate 1011 is made of insulating material, the phrase "current passing through the coated product" means that current exists in the metal film 1012. The Ampere force F refers to the force exerted on a current-carrying conductor in a magnetic field B.

[0059] like Figure 3As shown, the substrate 1011 is an insulating material, and "current passing through the coated product 101" refers to the current I passing through the metal film 1012. For ease of observation, the substrate 1011, the metal film 1012 and the cooling component 201 are shown adjacent to each other at a certain distance in the figure, which does not mean that the two are not in contact. When there is current I in the metal film 1012, the moving charges in the current I itself have a magnetic field and can be regarded as a magnet. Therefore, in the magnetic field B generated by the magnetic field generating component, the moving charges will be subject to the Lorentz force. Since there are many such moving charges in the metal film 1012, the Lorentz forces on the charges are superimposed on each other, forming a macroscopic Ampere force F. According to the left-hand rule and Figure 3 From the direction of the current I and the direction of the magnetic field B shown by the middle arrow, it can be judged that the direction of the Ampere force F acting on the metal film 1012 points to the cooling component 201. Therefore, the present application allows the coated product 101 to fit with the cooling component 201, reducing the gap between the coated product 101 and the cooling component 201, thereby reducing the probability of the film surface of the coated product 101 being damaged by heat and improving the yield of the coated product 101.

[0060] In addition, compared with the force generated by electrostatic adsorption, the Ampere force F is larger, so the metal film 1012 in the present application can be more closely attached to the cooling component 201, and the cooling component 201 can cool the coated product 101 to a greater extent; compared with the way in which the coated product is attached to the cooling component 201 by the traction force during the transmission process, the distribution of the Ampere force F will not be concentrated on Figure 1 The positions where the coated product 101 contacts the cooling drum 102 and the roller are shown. Therefore, the coated product 101 in the present application can be more evenly attached to the cooling assembly 201, reducing the probability of wrinkles forming on the film surface. Furthermore, the distance between the coated product 101 with fewer or no wrinkles and the cooling assembly 201 is basically the same, which allows it to be more closely attached to the cooling assembly 201, reducing the probability of the film surface of the coated product 101 being damaged by heat, and improving the yield of the coated product 101.

[0061] The components and arrangement positions of the current generating component 202 can be flexibly set according to needs, which will be described below with reference to an embodiment:

[0062] In some embodiments, the current generating component 202 includes at least one first roller and a second roller disposed in a one-to-one correspondence with the first roller, wherein the polarities of charges carried by the first roller and the second roller are opposite.

[0063] It should be noted that the first and second rollers are cylindrical devices that support and transport objects. The rollers can rotate along their axes to transport objects. The first and second rollers are made of conductive material and are connected to electrodes of different polarity. They carry opposite charges, allowing current to flow when the first and second rollers are connected via a conductor.

[0064] For example, Figure 5 As shown, the current generating component 202 includes a single first roller and a single second roller, the first roller is positively charged and the second roller is negatively charged. The two rollers are arranged on opposite sides of the metal film 1012 and are connected by the metal film 1012, and form a current I1 on the metal film 1012.

[0065] In some embodiments, a plurality of first rollers are arranged along a first direction, and a plurality of second rollers are arranged along a second direction, wherein the first direction is parallel to the second direction, intersecting the direction of the magnetic field and parallel to the surface of the coated product. The first direction and the second direction may be parallel to the direction in which the current generating assembly conveys the coated product.

[0066] For example, see Figure 5 The current generating component 202 includes a plurality of positively charged first rollers arranged along a first direction ( Figure 5 The first rollers A11-A13 are shown in FIG) and a plurality of negatively charged second rollers ( Figure 5 (shown as second rollers A21-A23). It should be noted that, Figure 5 The roller in the figure is in contact with the metal film 1012, but for the convenience of observation, Figure 5 The roller in the figure is shown to be spaced a certain distance from the metal film 1012.

[0067] With this arrangement, the first and second rollers are positioned opposite each other, with each first roller positioned at an equal distance from the surface of the coated product, and each second roller positioned at an equal distance from the surface of the coated product. The coated product contacts the first and corresponding second rollers, forming a current path. This can generate multiple currents on the coated product, allowing the coated product to be approximately viewed as multiple charged conductors subjected to the Ampere force. Furthermore, because the rollers are arranged in a direction that intersects the magnetic field, the Ampere force acting on the coated product is non-zero.

[0068] In some embodiments, the spacing between any adjacent first rollers is equal to the spacing between any adjacent second rollers.

[0069] See also Figure 5 The distance between any two adjacent first rollers is the same, namely, the first length L1. The distance between any two adjacent second rollers is the same, namely, the second length L2. The first length L1 and the second length L2 are equal. The first roller A11 and the second roller A21 contact the metal film 1012 so that the current I1 passes through the metal film 1012. The first roller A12 and the second roller A22 contact the metal film 1012 so that the current I2 passes through the metal film 1012. The first roller A13 and the second roller A23 contact the metal film 1012 so that the current I3 passes through the metal film 1012.

[0070] See also Figure 5 Since the intervals between two adjacent rollers in the same direction are the same, the currents I1-I3 on ​​the metal film 1012 are evenly distributed, so that the coated product 101 can be evenly affected by the Ampere force F.

[0071] Furthermore, according to the calculation formula for the Ampere force F, if the magnetic flux density of the magnetic field B, the magnitude of the current I generated by each pair of rollers on the metal film 1012, and the angle between the direction of the current I and the direction of the magnetic flux density are the same, and if the length of the current path on the metal film 1012 is the same, then the Ampere force F exerted on each area of ​​the metal film 1012 is not only uniformly distributed, but also of the same magnitude. Figure 5 The arrangement can make the coating product 101 fit evenly and tightly to the cooling component 201.

[0072] In some embodiments, the current generating component is disposed in contact with the metal film.

[0073] It can be understood that the contact setting here means that the surface of the current generating component is in complete contact with the surface of the metal film or there is a certain gap, and the existing gap should be sufficient for the current generating component to allow current to pass through the metal film.

[0074] like Figure 4 As shown, the current generating assembly includes a first roller A11 and a corresponding second roller A21 , and the first roller A11 and the corresponding second roller A21 are arranged in contact with the metal film 1012 so that the current I1 passes through the metal film 1012 .

[0075] It should be noted that, in addition to Figure 2 In addition to the arrangement of the cooling component 201, the metal film 1012, the substrate 1011 and the current generating component 202 in sequence, it is also possible to arrange the cooling component 201, the metal film 1012, the substrate 1011 and the current generating component 202 in sequence as shown. Figure 6a As shown, the current generating component (attached Figure 6a The metal film 1012 and the substrate 1011 are arranged in sequence, and the cooling component 201 is arranged in contact with the metal film 1012, or as shown in FIG. Figure 7b As shown, the current generating component 202, the metal film 1012, the substrate 1011 and the cooling component 201 are arranged in sequence.

[0076] In addition to the above-mentioned current generating components, the magnetic field generating components can also be flexibly configured in terms of composition and arrangement, as illustrated below with examples:

[0077] In some embodiments, the magnetic field generating component comprises a conductive coil or a magnet.

[0078] It should be noted that a conductive coil is a ring-shaped winding of wire. When energized, it generates a magnetic field within and around the coil. Furthermore, to increase the magnetic induction intensity, a metal core can be placed in the middle of the coil. For example, a metal with a relative magnetic permeability greater than 10 can be placed. The metal core material can be selected from metals such as Fe, Co, Ni, or alloys. The structure and shape of the conductive coil can be designed as needed.

[0079] A magnet is a substance with magnetic properties that attracts metals such as iron, nickel, and cobalt. Magnets are typically made of these metals, but can also contain other materials, such as rare earth elements. The strength and direction of the magnetic field can be adjusted by changing the shape and structure of the magnet.

[0080] In some embodiments, the cooling assembly includes a accommodating cavity for accommodating multiple magnetic field generating components, wherein the multiple magnetic field generating components are arranged in layers along the radial direction of the accommodating cavity, the multiple magnetic field generating components in each layer are arranged along the circumferential direction of the accommodating cavity, and there are gaps between adjacent magnetic field generating components in each layer, and the gaps between two adjacent layers are arranged in an staggered manner.

[0081] It should be noted that the accommodating cavity refers to an object with an approximately circular cross-section, the radial direction refers to the radial direction of the circular cross-section, and the circumferential direction refers to the circumferential direction of the circular cross-section. For example, the cooling component can be a cooling drum, and the accommodating cavity is a cylindrical shell in the cooling drum that accommodates multiple magnetic field generating components. The cylindrical shell also accommodates multiple liquid cooling pipes for cooling the surface of the cooling drum.

[0082] For example, Figure 7a 、 Figure 7b The front view of the coating device shown in FIG. 2 shows that the cooling assembly 201 includes at least one magnetic field generating component ( Figure 7a as well as Figure 7b The current generating assembly 202 includes first rollers A11-A17 and corresponding second rollers. The coated product 101 is located in the space between the housing cavity 701 and the current generating assembly 202.

[0083] It should be noted that due to Figure 7a 、 Figure 7b It is a front view and the second roller is arranged opposite to the first roller, so Figure 7a The second roller is not shown; in addition, for easy observation, Figure 7a 、 Figure 7b Only the magnetic field B provided by some magnetic field generating components is shown. Figure 7a as well as Figure 7b Each magnetic field generating component can generate a magnetic field B.

[0084] Depend on Figure 7a It can be seen that there are gaps between adjacent magnetic field generating components in each layer. This is because if there were no gaps between the magnetic field generating components to form a closed annular magnet (conductive coil or magnet), the magnetic field B would only exist inside the annular magnet and would not exist outside the magnet.

[0085] Depend on Figure 7b It can be seen that the gaps between two adjacent layers are arranged in an alternating manner, that is, the areas not covered by the magnetic field B provided by the magnetic field generating components in each layer are covered by the magnetic field B provided by other magnetic field generating components in the adjacent layer, so that the magnetic fields B provided by each magnetic field generating component are complementary, and thus all the energized areas of the metal film 1012 are located in the magnetic field B and are affected by the Ampere force F.

[0086] It is worth noting that if cooling assembly 201 includes a liquid cooling pipe, the gaps between the magnetic field generating components in the aforementioned embodiment can allow the liquid cooling pipe to pass through the gaps, facilitating the integrated design of cooling assembly 201. Furthermore, if the magnetic field generating component is a conductive coil, the liquid cooling pipe can also cool the conductive coil.

[0087] It should also be noted that, see Figure 7b The Ampere force F exerted on the metal film 1012 not only makes itself fit tightly to the substrate 1011, but also makes the coated product 101 fit tightly to the cooling drum, thereby improving the cooling effect of the cooling drum on the coated product 101, reducing the probability of film surface deformation, and improving the yield of the coated product 101.

[0088] In some embodiments, the cooling component is a cooling drum, the relative magnetic permeability of the heat-conducting layer on the outer surface of the cooling drum is less than a first threshold, and the thermal conductivity of the heat-conducting layer is greater than a second threshold.

[0089] It is understandable that since a magnetic field generating component is provided inside the cooling drum, the magnetic field provided by the magnetic field generating component will pass through the outer surface of the cooling drum. In order to avoid interference of the outer surface material of the cooling drum with the magnetic field provided by the magnetic field generating component, the thermal conductive layer should be made of a weak magnetic material with a relatively small magnetic permeability. In addition, since the cooling drum is used to cool the coated products, the thermal conductive layer on the outer surface of the cooling drum should have good thermal conductivity, such as a material with a thermal conductivity greater than 100W / (m·K).

[0090] It should be noted that if the heat-conducting layer on the outer surface of the cooling drum is made of metal, in order to avoid short-circuiting the first and second rollers, the outer surface of the cooling drum should be kept at a certain distance from the first and second rollers. In addition, in order to reduce the impact on the current flowing through the metal film, the metal film and the outer surface of the cooling drum should be insulated, for example, Figure 7aAs shown, an insulating substrate 1011 is disposed between the metal film 1012 and the outer surface of the cooling drum.

[0091] In some embodiments, the cooling device is a cooling drum, and the cooling assembly further includes a bracket, which is located in the cooling drum and is used to support and fix each magnetic field generating component.

[0092] It should be noted that if the magnetic field generating component is a conductive coil, the bracket may be made of a material with a relatively high thermal conductivity so as to support the conductive coil while performing heat exchange for the conductive coil.

[0093] The magnitude and direction of the Ampere force in each of the above embodiments can be flexibly set by adjusting the current direction and the magnetic field direction, which will be described below with reference to the embodiments:

[0094] In some embodiments, the direction of the current on the coated product intersects with the direction of the magnetic field.

[0095] According to the Ampere force calculation formula, if the current direction on the coated product is parallel to the magnetic field direction, then the Ampere force calculation formula shows that the Ampere force is equal to 0. If the current direction of the charged conductor intersects with the magnetic field direction, then the Ampere force calculation formula shows that the Ampere force acting on the current is greater than zero.

[0096] In some embodiments, the direction of the current on the coated product is perpendicular to the direction of the magnetic field.

[0097] like Figure 3 As shown, according to the Ampere force calculation formula, when the magnetic induction intensity of the magnetic field B, the current I intensity and the current path length L are the same, the Ampere force F is maximum when the direction of the current I is perpendicular to the direction of the magnetic field B.

[0098] In addition to the above-mentioned current generating component 202 and magnetic field generating component, the coating device 20 also includes other components:

[0099] In some embodiments, the magnetic field generating component is a conductive coil, and accordingly, see Figure 8 , the coating device 20 further includes:

[0100] The power supply component 801 is used to adjust the current of the conductive coil to adjust the magnetic induction intensity, thereby adjusting the magnitude of the Ampere force F exerted on the metal film 1012 .

[0101] It is understood that the power supply assembly 801 herein refers to a device composed of multiple components for providing electrical energy to the conductive coil. According to the formula for calculating magnetic induction intensity, the current magnitude is positively correlated with the magnetic induction intensity, so the magnetic induction intensity can be adjusted by adjusting the current magnitude of the conductive coil.

[0102] For example, taking the example of a power supply component providing power to a conductive coil, see Figure 8 The power supply component 801 includes a power supply 8011 and a sliding rheostat 8012, wherein the power supply 8011, the sliding rheostat 8012 and the conductive coil C1 are connected in series, and the current of the conductive coil can be adjusted by adjusting the resistance value of the sliding rheostat 8012.

[0103] Based on the same technical concept, the present application also provides a production system, such as Figure 9 As shown, the production system 90 includes any of the above-mentioned coating devices 20. The implementation of the production system 90 can refer to the embodiments of the above-mentioned coating devices 20, and the repeated parts will not be repeated.

[0104] In addition, those skilled in the art should know that Figure 9 The production system 90 shown is a collection of hardware equipment, software programs and production resources used to manufacture products. For example, the production system 90 can be a composite current collector production line deployed with a coating device 20, or a production line that requires a coating process in other scenarios. This application does not limit this.

[0105] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0106] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A coating device for preparing a coated product, wherein: The coating product includes a substrate and a metal film, and is characterized in that the coating device includes: a cooling assembly for cooling the coated product, wherein the cooling assembly comprises at least one magnetic field generating component for providing a magnetic field so that the coated product is located in the magnetic field; and The current generating component is used to pass current through the coated product so that the direction of the Ampere force exerted on the coated product in the magnetic field points to the cooling component.

2. The coating device according to claim 1, characterized in that The current generating component includes at least one first roller and a second roller arranged in a one-to-one correspondence with the first roller, wherein the polarities of charges carried by the first roller and the second roller are opposite.

3. The coating device according to claim 2, characterized in that: Multiple first rollers are arranged along a first direction, and multiple second rollers are arranged along a second direction. The first direction is parallel to the second direction, the first direction intersects with the direction of the magnetic field, and the first direction is parallel to the surface of the coated product.

4. The coating device according to claim 2 or 3, characterized in that: The distance between any adjacent first rollers is equal to the distance between any adjacent second rollers.

5. The coating device according to any one of claims 1 to 4, characterized in that: The current generating component is disposed in contact with the metal film.

6. The coating device according to any one of claims 1 to 5, characterized in that: The magnetic field generating component includes a conductive coil or a magnet.

7. The coating device according to claim 6, characterized in that: The cooling assembly includes a housing cavity for accommodating a plurality of the magnetic field generating components, wherein the plurality of the magnetic field generating components are arranged in layers along the radial direction of the housing cavity, and the plurality of the magnetic field generating components in each layer are arranged along the circumferential direction of the housing cavity, and there are gaps between adjacent magnetic field generating components in each layer, and the gaps between two adjacent layers are arranged in an staggered manner.

8. The coating device according to any one of claims 1 to 7, characterized in that: The direction of the current on the coated product is perpendicular to the direction of the magnetic field.

9. The coating device according to any one of claims 6 to 8, characterized in that: The magnetic field generating component is a conductive coil, and accordingly, the coating device further includes: The power supply component is used to adjust the current of the conductive coil to adjust the magnetic induction intensity.

10. A production system, characterized in that: The device comprises a coating device as described in any one of claims 1 to 9.

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