A magnetic shielding structure and a wireless charging module

Abstract

The application relates to the technical field of wireless charging, in particular to a magnetic shielding structure and a wireless charging module. The magnetic shielding structure comprises a first edge covering structure layer, a magnetic material layer and a second edge covering structure layer arranged in sequence, wherein the first edge covering structure layer and the second edge covering structure layer are respectively arranged on the two sides of the magnetic material layer, are used for protecting the magnetic material layer, and provide mechanical support and insulation protection; the magnetic material layer is used for providing a low magnetic resistance path and reducing electromagnetic interference; the magnetic material layer comprises a plurality of magnetic core laminates; the plurality of magnetic core laminates are stacked and arranged; the area of the magnetic core laminates located in the middle of the stacking structure of the magnetic material layer is smaller than that of the magnetic core laminates located on the two sides of the stacking structure; and the magnetic core laminates located on the two sides of the stacking structure wrap the magnetic core laminates located in the stacking structure. The magnetic shielding structure can improve the safety of the magnetic shielding structure.

Description

Technical Field

[0001] This application relates to the field of wireless charging technology, and in particular to a magnetic shielding structure and a wireless charging module. Background Technology

[0002] Wireless charging technology refers to charging using the principle of electromagnetic wave induction. Its principle originates from the theory of wireless power transfer and has experienced rapid development with the widespread adoption of consumer electronics. Currently, the mainstream wireless charging technologies can be divided into three types: electromagnetic induction (Qi standard), magnetic resonance (A4WP standard), and radio frequency (RF). Among them, the Qi standard, based on the principle of electromagnetic induction, has been widely used due to its technological maturity and cost advantages. Wireless charging devices generate an alternating electric field during operation. The magnetic shielding material used in these devices reduces magnetic field leakage, improves energy transfer efficiency, and prevents electromagnetic interference (EMI) from affecting surrounding electronic devices. Common magnetic shielding materials mainly include soft magnetic alloys, ferrites, amorphous / nanocrystalline alloys, and composite shielding materials.

[0003] In related technologies, electromagnetic induction wireless charging modules include a magnetic shielding material layer and an electromagnetic coil disposed on the magnetic shielding material. The magnetic shielding material layer is typically processed from multiple layers of nanocrystalline materials. The thickness of each nanocrystalline layer is 10-25 μm, and the hardness of the nanocrystalline material is typically in the range of 500-1500 HV, far exceeding that of traditional ferrite and amorphous materials. This high hardness stems from its ultrafine grain structure and the strengthening effect of alloying elements, but it also makes it relatively brittle, prone to breakage or chipping during processing. Currently, the industry typically uses thin films (such as polymer materials like PET and PI) for edge binding to improve this situation. Edge binding not only provides additional mechanical protection, preventing further damage to the nanocrystalline material during production and assembly, but also effectively suppresses the potential risks caused by nanocrystalline breakage.

[0004] When the thickness of the magnetic shielding material layer exceeds 25 μm, the nanocrystalline metallographic assembly becomes inhomogeneous, leading to a rapid decrease in performance. Therefore, to achieve higher performance, current methods combine multiple layers of nanocrystalline materials into a single unit. This multi-layered nanocrystalline structure can improve the material's magnetic permeability, exhibiting greater stability, especially at high frequencies. This thin-layer structure maintains high performance while also improving the magnetic saturation characteristics of the magnetic material under high-frequency conditions. To achieve better performance in the magnetic material layer, different regions of the layer are defined with different thicknesses, and to achieve these different thicknesses, different numbers of nanocrystalline layers are incorporated into different regions of the magnetic material layer.

[0005] Because the center of the electromagnetic coil in a wireless charging module is the area with the strongest magnetic field, it is also the region most prone to saturation. When the magnetic field strength increases, the magnetic material may reach magnetic saturation, thus reducing its permeability and efficiency. To increase the magnetic field to a higher level while preventing magnetic saturation and minimizing product thickness, the industry solution is to thicken the magnetic material layer corresponding to the center region of the electromagnetic coil, such as... Figure 1 As shown, this involves covering a smaller magnetic material layer on top of a larger one. However, a step exists between the smaller and larger magnetic material layers, and noticeable burrs are present at the step, such as... Figure 2 As shown. Due to their high hardness and sharp edges, burrs can easily pierce various protective films in devices, especially in high-temperature or vibrating environments, where they are more likely to detach or deform, leading to greater safety hazards, including short circuits and even battery explosions. Furthermore, during operation, the coil of a wireless charging module is exposed to high temperatures for extended periods, accelerating the aging of the adhesive and insulation layers on the coil wires. With prolonged use, the number of pinholes in the coil gradually increases, and these pinholes may form micro-short circuits with the nanocrystals, further reducing charging efficiency.

[0006] To minimize the risk of burrs and debris during the processing and use of nanocrystalline materials, it is necessary to study better design schemes to improve product quality, extend service life, and further enhance product safety. Utility Model Content

[0007] Therefore, it is necessary to provide a magnetic shielding structure and wireless charging module that can reduce the problem of burrs in the magnetic shielding structure, help optimize the safety of the magnetic shielding structure, and thus improve the safety of the application product.

[0008] In a first aspect, this application provides a magnetic shielding structure, comprising: a first edge-sealing structure layer, a magnetic material layer, and a second edge-sealing structure layer disposed sequentially, wherein:

[0009] The first edge-sealing structure layer and the second edge-sealing structure layer are respectively disposed on both sides of the magnetic material layer;

[0010] The magnetic material layer includes a first cover layer, an intermediate layer, and a second cover layer stacked sequentially. The area of ​​the intermediate layer is smaller than that of the first cover layer and the second cover layer, and the first cover layer and the second cover layer respectively cover the intermediate layer from both sides.

[0011] In one embodiment, the edge-sealing structure layer includes an insulating edge-sealing structure.

[0012] In one embodiment, the first cover layer and / or the intermediate layer and / or the second cover layer comprise: a plurality of composite magnetic material sheets.

[0013] In one embodiment, the magnetic material sheet is prepared from a magnetic material, which includes one of ferrite materials, amorphous / nanocrystalline alloys, soft magnetic composite materials, and flexible magnetic films.

[0014] In one embodiment, the magnetic material sheet is prepared from a magnetic material, which includes a combination of ferrite materials, amorphous / nanocrystalline alloys, soft magnetic composite materials, and flexible magnetic films.

[0015] In one embodiment, the magnetic material sheet is prepared from a nanocrystalline alloy.

[0016] In one embodiment, the magnetic material sheet is a sheet-like structure obtained by decomposing a nanocrystalline alloy, and each sheet-like structure includes a plurality of decomposed nanocrystalline stacks.

[0017] In one embodiment, the intermediate layer is provided with a clearance opening.

[0018] In one embodiment, the magnetic shielding structure further includes:

[0019] A shielding layer is disposed on the side of the first or second edge-sealing structure layer away from the magnetic material layer.

[0020] In one embodiment, the shielding layer is a sheet-like structure made of a metallic material.

[0021] In one embodiment, the metal material is copper.

[0022] In one embodiment, an adhesive layer is provided between the layers of the magnetic shielding structure.

[0023] In one embodiment, an adhesive layer is provided between the stacked structures of the magnetic material layers.

[0024] Secondly, embodiments of this application also provide a wireless charging module, the wireless charging module including a magnetic shielding structure as described in any one of the first aspects, an electromagnetic coil disposed on the magnetic shielding structure, and a positioning magnetic ring, wherein the intermediate layer of the magnetic material layer covers the central region of the electromagnetic coil.

[0025] In one embodiment, the positioning magnetic ring surrounds the magnetic shielding structure and the electromagnetic coil.

[0026] In one embodiment, the magnetic material layer covers the positioning magnetic ring.

[0027] In one embodiment, the positioning magnetic ring has a notch, the magnetic shielding structure and the electromagnetic coil are surrounded within the positioning magnetic ring, and the magnetic shielding structure layer has a protrusion extending to the notch.

[0028] In one embodiment, the protrusion of the magnetic shielding structure layer is adapted to the notch.

[0029] In one embodiment, the magnetic material layer covering the positioning magnetic ring includes: the edge of the magnetic material layer extending to the edge of the positioning magnetic ring.

[0030] In one embodiment, the magnetic material layer covering the positioning magnetic ring includes: the edge of the magnetic material layer extending beyond the edge of the positioning magnetic ring.

[0031] The aforementioned magnetic shielding structure and wireless charging module have the following beneficial effects:

[0032] This application provides a magnetic shielding structure, including a first edge-sealing structure layer, a magnetic material layer, and a second edge-sealing structure layer, wherein: the first edge-sealing structure layer and the second edge-sealing structure layer are respectively disposed on both sides of the magnetic material layer, for protecting the magnetic material layer and providing mechanical support and insulation protection; the magnetic material layer is used to provide a low magnetic resistance path and reduce electromagnetic interference; the magnetic material layer includes a first cover layer, an intermediate layer, and a second cover layer stacked sequentially, the area of ​​the intermediate layer is smaller than that of the first cover layer and the second cover layer, and the first cover layer and the second cover layer respectively cover the intermediate layer from both sides, that is, the magnetic material layer includes a plurality of magnetic core stacks, the plurality of magnetic core stacks are stacked, the area of ​​the magnetic core stack located in the middle of the stacked structure of the magnetic material layer is smaller than that of the magnetic core stacks located on both sides of the stacked structure, and the magnetic core stacks located on both sides of the stacked structure cover the magnetic core stack located in the stacked structure. In implementation, the magnetic material layer comprises several magnetic stacks stacked with a small central area and large lateral areas. The outer magnetic core stacks cover the central small core stack, creating a symmetrical, stepped covering structure. This helps confine any areas of disparity within the central region of the magnetic material layer and evenly distributes the disparity across the stacked structure, reducing the size of the disparity caused by area differences. Furthermore, the stepped stacking helps disperse mechanical stress, avoiding sharp-angle contacts between layers and eliminating edge burrs and interlayer microcracks caused by abrupt area changes in traditional stacks. In applications, the small central core stack helps reduce high-frequency eddy current concentration, while the large lateral core stacks help reduce eddy current losses. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of a magnetic shielding structure in the prior art;

[0035] Figure 2 This is a schematic diagram of a magnetic shielding stack structure in the prior art;

[0036] Figure 3 This is a schematic diagram of the magnetic shielding structure in one embodiment of this application;

[0037] Figure 4 This is a schematic diagram of the magnetic shielding stack structure in one embodiment of this application;

[0038] Figure 5 This is an exploded structural diagram of the magnetic shielding structure in a specific embodiment of this application;

[0039] Figure 6 This is a first distribution diagram of the positioning magnetic ring and magnetic shielding structure in one embodiment of this application;

[0040] Figure 7 This is a second distribution diagram of the positioning magnetic ring and magnetic shielding structure in one embodiment of this application;

[0041] Figure 8 This is a third distribution diagram of the positioning magnetic ring and magnetic shielding structure in one embodiment of this application;

[0042] Figure 9 This is a fourth distribution diagram of the positioning magnetic ring and magnetic shielding structure in one embodiment of this application.

[0043] Explanation of reference numerals in the attached drawings: 100, first edge-sealing structure layer; 200, magnetic material layer; 210, first covering layer; 220, intermediate layer; 230, second covering layer; 240, clearance opening; 300, second edge-sealing structure layer; 400, shielding layer; 500, electromagnetic coil; 600, positioning magnetic ring; 610, notch. Detailed Implementation

[0044] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0046] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0047] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0048] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0049] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0050] Based on the problems pointed out in the background art, this application provides a magnetic shielding structure that can, as... Figure 3 As shown, it mainly includes a three-layer structure, specifically a first edge-sealing structure layer 100, a magnetic material layer 200, and a second edge-sealing structure layer 300 arranged sequentially.

[0051] The first edge-sealing structure layer 100 and the second edge-sealing structure layer 300 are respectively disposed on the upper and lower sides of the magnetic material layer 200. The first edge-sealing structure layer 100 and the second edge-sealing structure layer 300 are used to enhance the mechanical strength of the structure and reduce edge magnetic leakage, so that the magnetic force path is confined within the range of the magnetic shielding structure. In addition, the first edge-sealing structure layer 100 and the second edge-sealing structure layer 300 can also provide insulation protection for the internal structure of the magnetic shielding structure.

[0052] For example, the specific shapes and materials of the first edge-binding structural layer 100 and the second edge-binding structural layer 300 are adapted to the actual application requirements. The specific shapes and materials of the first edge-binding structural layer 100 and the second edge-binding structural layer 300 are independent of each other and can be made of the same material or different types of materials. For example, the first edge-sealing structural layer 100 and the second edge-sealing structural layer 300 have high mechanical strength and can help suppress magnetic leakage. Therefore, the materials used to prepare the first edge-sealing structural layer 100 and the second edge-sealing structural layer 300 can be selected from the following: thermoplastic polymers, such as polymers with PPS (polyphenylene sulfide), PA6T (high-temperature resistant nylon), LCP (liquid crystal polymer) as the base material and glass fiber (to enhance stiffness) and magnetic powder (such as FeSiAl, to enhance edge shielding) as fillers; epoxy resin molding edge-sealing, such as polymers with epoxy resin + curing agent (such as bisphenol A type) as the base material and Al2O3 powder (thermal conductive) and carbon fiber (electrical conductive, to suppress edge eddy currents) as modifiers; magnetic polymer composite materials, such as TPU (thermoplastic polyurethane) as the base material and flake carbonyl iron powder as the functional filler; UV-cured acrylate edge-sealing, such as polymers with acrylate resin + nano SiO2 (to enhance wear resistance) as UV adhesive and carbon nanotubes (0.5wt%, electrostatic conductive) as additives. Other possible solutions are similar to those described above and will be selected by technical personnel based on the actual application scenario, and will not be elaborated here.

[0053] The magnetic material layer 200 includes a first cover layer 210, an intermediate layer 220, and a second cover layer 230 stacked sequentially. The area of ​​the intermediate layer 220 is smaller than that of the first cover layer 210 and the second cover layer 230, and the first cover layer 210 and the second cover layer 230 respectively cover the intermediate layer 220 from both sides, forming a "sandwich-like" stacked structure.

[0054] Specifically, the first cover layer 210, the intermediate layer 220, and the second cover layer 230 may include a single layer of magnetic material sheet, or they may be composed of several magnetic material sheets. The number of magnetic material sheet layers in the first cover layer 210, the intermediate layer 220, and the second cover layer 230 is independent of each other. In practice, the number of magnetic material sheet layers in each of the first cover layer 210, the intermediate layer 220, and the second cover layer 230 can be determined by technicians according to application requirements, such as product thickness and magnetic shielding performance.

[0055] For example, it can be as follows Figure 4As shown, the magnetic material sheet can be a nanocrystal made of nanocrystalline alloy material. Correspondingly, the first capping layer 210, the intermediate layer 220, and the second capping layer 230 are composited with several layers of magnetic material sheets. For example, the first capping layer 210 is composited with 2 layers of nanocrystals, the intermediate layer 220 is composited with 3 layers of nanocrystals, and the second capping layer 230 is composited with 5 layers of nanocrystals. In this way, the first capping layer 210, the intermediate layer 220, and the second capping layer 230 can be obtained by compositing multiple layers of magnetic material sheets, which helps to adjust the layered structure of the first capping layer 210, the intermediate layer 220, and the second capping layer 230 according to actual application requirements, and improves the flexibility of structural design.

[0056] Specifically, the magnetic material sheet can be prepared from magnetic materials, including ferrite materials, amorphous / nanocrystalline alloys, soft magnetic composite materials, flexible magnetic thin films, etc. The magnetic material sheet can be prepared from a single magnetic material or from a combination of multiple magnetic materials to meet the needs of different application scenarios, such as magnetic shielding performance requirements, mechanical strength requirements, corrosion resistance, and heat resistance. The specific preparation formula can be determined by technical personnel based on actual usage requirements, and will not be elaborated in this embodiment.

[0057] For example, in the process of obtaining the first capping layer 210, the intermediate layer 220, and the second capping layer 230 from magnetic material sheets, the composite processing between the magnetic material sheets can be selected according to application requirements, such as: lamination bonding composite, magnetic thin film deposition composite, woven fiber composite, powder sintering composite, and gradient material composite, etc., as sheet material composite processing technology. Furthermore, the composite processing technology described above can be determined by a technician according to application requirements during implementation; it can be determined to be one of them, such as lamination bonding; or it can be a combination of multiple processes, such as lamination bonding + gradient composite.

[0058] Specifically, in this embodiment, the first cover layer 210, the intermediate layer 220, and the second cover layer 230 are all planar sheet structures, and they are stacked in a direction perpendicular to their own plane. In this embodiment, a horizontal plane can be used as a reference plane parallel to the first cover layer 210, the intermediate layer 220, and the second cover layer 230 for illustration. In this embodiment, the statement that the area of ​​the intermediate layer 220 is smaller than that of the first cover layer 210 and the second cover layer 230 refers to its projected area on the horizontal plane; the projected area of ​​the intermediate layer 220 is smaller than that of the first cover layer 210 and the second cover layer 230. The first cover layer 210 and the second cover layer 230 cover the middle layer 220 from both sides. This means that the projection of the middle layer 220 on the horizontal plane is covered by the first cover layer 210 and the second cover layer 230. That is, from the top view and the bottom view of the horizontal plane, the middle layer 220 is completely covered and blocked by the first cover layer 210 and the second cover layer 230, respectively. In the subsequent lamination and bonding process, the portions of the first cover layer 210 and the second cover layer 230 that extend beyond the middle layer 220 fill the middle layer 220, ultimately forming the first cover layer 210 and the second cover layer 230 covering the middle layer 220.

[0059] By implementing the above-described magnetic shielding structure, the following beneficial effects can be achieved:

[0060] This application provides a magnetic shielding structure, including a first edge-sealing structure layer 100, a magnetic material layer 200, and a second edge-sealing structure layer 300, wherein: the first edge-sealing structure layer 100 and the second edge-sealing structure layer 300 are respectively disposed on both sides of the magnetic material layer 200, for protecting the magnetic material layer 200 and providing mechanical support and insulation protection; the magnetic material layer 200 is used to provide a low magnetic resistance path and reduce electromagnetic interference, the magnetic material layer 200 includes a plurality of magnetic core stacks, the plurality of magnetic core stacks are stacked, the area of ​​the magnetic core stack located in the middle of the stacked structure of the magnetic material layer 200 is smaller than that of the magnetic core stacks located on both sides of the stacked structure, and the magnetic core stacks located on both sides of the stacked structure cover the magnetic core stack located in the stacked structure. In implementation, the magnetic material layer 200 comprises several magnetic stacks stacked with a small area in the middle and a large area on both sides. The magnetic core stacks on both sides cover the small-area magnetic core stack in the middle, achieving a symmetrical stepped covering structure. This helps to limit the location of any drop in elevation to the central region of the magnetic material layer 200 and evenly distributes the difference in elevation on both sides of the stacked structure, reducing the size of the difference caused by area variations. Furthermore, the stepped stacking helps to disperse mechanical stress, thereby avoiding sharp-angle contacts between layers and eliminating edge burrs and interlayer microcracks caused by abrupt changes in area in traditional stacks. In applications, the small-area magnetic core stack in the middle helps to reduce high-frequency eddy current concentration, while the large-area magnetic core stacks on both sides help to reduce eddy current losses in applications.

[0061] In one embodiment, since the magnetic shielding structure is located inside the wireless charging module, its structure and shape are limited by the structure of the wireless charging module itself. It needs to work in conjunction with related devices such as the electromagnetic coil 500. However, the connectors or coils of these related devices may require the embedding of a magnetic shielding structure. In such scenarios, it is difficult for the magnetic shielding structure to maintain a regular shape such as a circle or rectangle. Based on the above problems, it can be addressed as follows... Figure 5 As shown, the magnetic shielding structure provided in this embodiment has a clearance opening 240 on the intermediate layer 220. In this way, a flexible and controllable space can be formed in the magnetic shielding structure through the clearance opening 240, so that the magnetic shielding structure can meet the purpose of avoiding other module structures or further reducing the thickness of the magnetic material layer 200.

[0062] Specifically, the clearance opening 240 can be located at the edge of the intermediate layer 220, forming a groove-shaped notch at the edge of the intermediate layer 220 to allow passage for module structures such as coil interfaces. The shape of the clearance opening 240 can be rectangular, circular, triangular, etc., and the specific shape can be determined by technicians according to application requirements. The clearance opening 240 can also be located in the middle of the intermediate layer 220, forming a through hole in the middle of the intermediate layer 220 to meet the application requirements of the notch, thereby fulfilling the need for space in the middle of the magnetic shielding structure. In the above two applications of the clearance opening 240, since opening the clearance opening 240 in the intermediate layer 220 may cause new edge burrs to be formed in the magnetic shielding structure, resulting in structural instability, correspondingly, passivation treatment can also be performed at the clearance opening 240 of the intermediate layer 220. For example, passivation treatment can refer to processing the corners of the clearance opening 240, turning the acute angle structure therein into an obtuse angle, or it can refer to adding a chamfer structure to the included angle of the cross section of the clearance opening 240, so that the included angle is changed from a right angle to a rounded corner. In this way, even if clearance openings 240 of various shapes are added, the magnetic material layer 200 can maintain the effect of reducing edge burrs.

[0063] In one embodiment, it can be as follows Figure 5 As shown, the magnetic shielding structure may further include a shielding layer 400. Specifically, the shielding layer 400 is disposed on the side of the first edge-sealing structure layer 100 or the second edge-sealing structure layer 300 away from the magnetic material layer 200. In practice, the shielding layer 400 can suppress magnetic field leakage through eddy current loss, thereby improving the shielding performance and application stability of the magnetic shielding structure.

[0064] For example, the shielding layer 400 has the characteristics of high thermal conductivity and electrical / magnetic conductivity. The shielding layer 400 can be a sheet structure made of a metallic material, such as a copper foil sheet. The shielding layer 400 can also be a metal matrix composite material, a flexible thermally conductive and insulating material, a magnetic-thermal conductive composite layer, a phase change material combined with a metal layer, etc.

[0065] In one embodiment, an adhesive layer is provided between the layers of the magnetic shielding structure, and an adhesive layer is also provided between the stacked structures within the magnetic material layer 200. In this way, the adhesive layer enhances the functional layers on both sides of the adhesive layer, improving the stability of the magnetic shielding structure and the stability of its electromagnetic properties.

[0066] For example, the adhesive layer can be an insulating adhesive layer, such as epoxy resin adhesive, polyimide film, and silicone rubber; it can also be a thermally conductive adhesive layer, such as conductive adhesive containing metal particles, graphene-filled adhesive, and ceramic-filled adhesive; it can also be a magnetically conductive adhesive layer, such as magnetic particle adhesive and nanocrystalline alloy adhesive; or it can be a multifunctional composite adhesive layer, such as a gradient adhesive layer or a phase change material adhesive layer. The adhesive layer can be directly attached and fixed between the layers, or it can be fixed between the layers through processes such as hot pressing and curing.

[0067] In one of the most specific embodiments, an exploded structural diagram of a magnetic shielding structure provided in this application can be shown as follows: Figure 5 As shown. Figure 5 The image illustrates a magnetic shielding structure in a specific embodiment. The overall structure of the magnetic shielding structure is a stacked layer structure. From top to bottom, it consists of a shielding layer 400, a first edge-sealing structure layer 100, a first cover layer 210, an intermediate layer 220, a second cover layer 230, a second edge-sealing structure layer 300, and an electromagnetic coil 500. Specifically, the shielding layer 400 is a copper foil sheet; the first edge-sealing structure layer 100 is an edge-sealing polymer formed into a sheet structure; the first cover layer 210 is a nanocrystalline layer formed into a circle and including two layers of nanocrystalline material sheets; the intermediate layer 220 is a nanocrystalline layer formed into a circle and including three layers of nanocrystalline material sheets, and a rectangular notch is also provided at the edge of the intermediate layer 220; the second cover layer 230 is a nanocrystalline layer formed into a circle and including five layers of nanocrystalline material sheets; and the second edge-sealing structure layer 300 is an edge-sealing polymer formed into a sheet structure.

[0068] In this way, the first covering layer 210 and the second covering layer 230 cover the middle layer 220 from both sides, improving the stability of the magnetic shielding structure.

[0069] Based on the same inventive concept, this application also provides a wireless charging module, which includes a magnetic shielding structure, an electromagnetic coil 500, and a positioning magnetic ring 600. The magnetic shielding structure is as described in any of the above embodiments, and includes a magnetic material layer 200, with an intermediate layer 220 of the magnetic material layer 200 covering the central region of the electromagnetic coil 500.

[0070] Specifically, the positioning magnetic ring 600 is arranged parallel to the magnetic shielding structure, and the specific relative positional and dimensional relationships are determined according to actual application requirements. For example, the positional relationship between the positioning magnetic ring 600 and the magnetic shielding structure may include:

[0071] like Figure 6 As shown, the positioning magnetic ring 600 can surround the magnetic shielding structure and the electromagnetic coil 500;

[0072] like Figure 7 As shown, the edge of the magnetic material layer 200 of the magnetic shielding structure can extend to the edge of the positioning magnetic ring 600 and align with the edge of the positioning magnetic ring 600.

[0073] like Figure 8 As shown, the edge of the magnetic material layer 200 of the magnetic shielding structure can extend to the edge of the positioning magnetic ring 600 and to the outside of the edge of the positioning magnetic ring 600.

[0074] like Figure 9 As shown, a notch 610 may also be provided on the positioning magnetic ring 600. The magnetic shielding structure and the electromagnetic coil 500 are surrounded within the positioning magnetic ring 600, and the electromagnetic shielding structure layer has a protrusion extending to and fitting the notch 610. It is understood that the above-mentioned magnetic shielding structure and wireless charging module can also adopt other forms, and are not limited to the forms mentioned in the above embodiments, as long as they can achieve the function of improving the safety of the magnetic shielding structure.

[0075] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0076] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A magnetic shielding structure, characterized in that, include: The first edge-sealing structure layer, the magnetic material layer, and the second edge-sealing structure layer are arranged sequentially, wherein: The first edge-sealing structure layer and the second edge-sealing structure layer are respectively disposed on both sides of the magnetic material layer; The magnetic material layer includes a first cover layer, an intermediate layer, and a second cover layer stacked sequentially. The area of ​​the intermediate layer is smaller than that of the first cover layer and the second cover layer, and the first cover layer and the second cover layer respectively cover the intermediate layer from both sides.

2. The magnetic shielding structure according to claim 1, characterized in that, The first cover layer and / or the intermediate layer and / or the second cover layer comprise: a plurality of composite magnetic material sheets.

3. The magnetic shielding structure according to claim 1, characterized in that, The intermediate layer is provided with a clearance opening.

4. The magnetic shielding structure according to claim 1, characterized in that, The magnetic shielding structure also includes: A shielding layer is disposed on the side of the first or second edge-sealing structure layer away from the magnetic material layer.

5. The magnetic shielding structure according to claim 4, characterized in that, The shielding layer is a sheet-like structure made of metallic material.

6. A magnetic shielding structure according to any one of claims 1 to 5, characterized in that, An adhesive layer is provided between the layers of the magnetic shielding structure and / or between the stacked structures of the magnetic material layers.

7. A wireless charging module, characterized in that, The wireless charging module includes a magnetic shielding structure as described in any one of claims 1 to 6, an electromagnetic coil disposed on the magnetic shielding structure, and a positioning magnetic ring, wherein the intermediate layer of the magnetic material layer covers the central region of the electromagnetic coil.

8. The wireless charging module according to claim 7, characterized in that: The positioning magnetic ring surrounds the magnetic shielding structure and the electromagnetic coil; or... The magnetic material layer covers the positioning magnetic ring; or... The positioning magnetic ring has a notch, the magnetic shielding structure and the electromagnetic coil are surrounded within the positioning magnetic ring, and the magnetic shielding structure has a protrusion that extends to and is adapted to the notch.

9. The wireless charging module according to claim 8, characterized in that: The magnetic material layer covering the positioning magnetic ring includes: The edge of the magnetic material layer extends to the edge of the positioning magnetic ring; or... The edge of the magnetic material layer extends to the outside of the edge of the positioning magnetic ring.

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