Magnetic attraction positioning structure and wireless charging device

Abstract

Provided are a magnetic adsorption positioning structure and a wireless charging device that can improve the positioning effect by magnetic adsorption, strengthen the positioning assist effect, and increase charging efficiency and stability. [Solution] The magnetic adsorption positioning structure includes a magnetic shield layer 100 and a positioning magnetic ring 200, the magnetic shield layer and the positioning magnetic ring being arranged in a stacked manner, the magnetic shield layer covering the positioning magnetic ring in a direction perpendicular to the stacked arrangement axis direction, or the positioning magnetic ring having a cutout portion, the magnetic shield layer being surrounded inside the positioning magnetic ring, and the magnetic shield layer having a protrusion extending to the cutout portion.

Description

[Technical Field]

[0001] The present application relates to the technical field of wireless charging devices, and in particular to a magnetic attraction positioning structure and a wireless charging device. [Background technology]

[0002] Wireless charging technology utilizes the principle of electromagnetic induction to charge devices. This principle originated in wireless power transmission theory and has rapidly developed alongside the widespread use of consumer electronics. Currently, mainstream wireless charging technologies can be broadly divided into three types: electromagnetic induction (Qi standard), magnetic resonance (A4WP standard), and radio frequency (RF) charging. Among these, the Qi standard, based on the electromagnetic induction principle, is widely used due to its technological maturity and cost advantages. Wireless charging devices generate alternating electric fields during operation. Magnetic shielding materials installed inside the device can reduce magnetic field leakage, improve energy transfer efficiency, and prevent electromagnetic interference (EMI) in surrounding electronic devices. Common magnetic shielding materials include soft magnetic alloys, ferrites, amorphous / nanocrystalline alloys, and composite shielding materials.

[0003] In related technology, wireless charging devices are typically equipped with magnetic attraction and positioning structures. Magnetic attraction and positioning structures in wireless charging devices are a technology for automatically aligning devices using magnetic components, aiming to improve charging efficiency and user experience. Magnetic attraction and positioning structures achieve rapid alignment by mutually attracting permanent magnets (e.g., neodymium magnets) built into the power transmitting side (charging pad) and the power receiving side (device). This allows the charging coils to be precisely aligned, improving energy transmission efficiency during wireless charging and reducing energy loss, enabling faster and more efficient charging. Meanwhile, magnetic attraction and positioning structures can guide the device to the optimal charging position using magnetic force, reducing the need for manual positioning and improving the user experience. Furthermore, magnets secure the device and keep it stable during charging, reducing the risk of charging interruptions due to misalignment during charging. Therefore, magnetic attraction and positioning structures are widely used in wireless charging devices. Conventional magnetic attraction and positioning structures typically include a power transmitting magnetic ring, a power receiving magnetic ring, and a shielding layer. The power-transmitting magnetic ring is a ring-shaped or multi-pole magnet array built into the charging pad, which creates a specific magnetic field distribution. The power-receiving magnetic ring is a magnet or magnetic attraction accessory (e.g., MagSafe) installed at a corresponding position on the back of the device (e.g., smartphone). The shielding layer is installed to prevent the magnetic field from interfering with other electronic components.

[0004] Magnets therefore play an important role in wireless charging systems, assisting in device alignment to the charging position and improving charging efficiency and stability. Due to their reliance on magnetic force, improvements to magnetic adsorption positioning structures have primarily focused on improving magnetic adsorption strength. However, because devices to be charged, such as tablets, smartphones, and earphones, require overall thinness, simply increasing the magnet size is not feasible, resulting in an increase in device thickness. For this reason, conventional wireless chargers have adopted magnetic materials with higher magnetic adsorption performance (e.g., replacing N48-grade magnetic materials with higher-grade materials such as N52SH, N54SH, and N56) to manufacture magnetic adsorption positioning structures by improving the quality of the magnets, thereby enhancing the magnetic adsorption force through the electromagnetic properties of the material itself. However, upgrading the material grade increases the manufacturing costs of wireless chargers.

[0005] In order to meet the dimensional limitations of wireless charging devices, minimize manufacturing costs, improve the assist effect of device alignment during charging, and improve charging efficiency and stability, it is necessary to consider better design solutions to increase the magnetic adsorption strength of the magnetic adsorption positioning structure. Summary of the Invention

[0006] Based on this, it is necessary to provide a magnetic adsorption positioning structure and a wireless charging device that can improve the positioning effect of magnetic adsorption, strengthen the alignment assist effect, and increase charging efficiency and stability.

[0007] In a first aspect, the present application provides a magnetically attracting positioning structure, the magnetically attracting positioning structure including a magnetic shield layer and a positioning magnetic ring; The magnetic shield layer and the positioning magnetic ring are arranged in a stacked manner, and the magnetic shield layer covers the positioning magnetic ring in a direction perpendicular to the stacked arrangement axis direction.

[0008] In one embodiment, the positioning magnetic ring has a notch, the magnetic shield layer is surrounded inside the positioning magnetic ring, and the magnetic shield layer has a protrusion that extends to the notch.

[0009] In one embodiment, the magnetic shield layer covers the positioning magnetic ring in a direction perpendicular to the stacking axis direction, The edge of the magnetic shield layer is aligned with the edge of the positioning magnetic ring.

[0010] In one embodiment, the edge of the magnetic shield layer extends to the outside of the edge of the positioning magnetic ring.

[0011] In one embodiment, the edge of the magnetic shield layer protrudes from the edge of the positioning magnetic ring by 1 to 15 mm.

[0012] In one embodiment, the protrusions of the magnetic shield layer are disposed in the notches.

[0013] In one embodiment, the edges of the protrusions of the magnetic shield layer are aligned with the edges of the cutouts.

[0014] In one embodiment, the edge of the protrusion of the magnetic shield layer extends to the outside of the edge of the notch.

[0015] In one embodiment, the magnetic shield layer includes an edge structure layer and a magnetic material layer; The border structure layers are provided on both sides of the magnetic material layer.

[0016] In one embodiment, the magnetic shield layer further includes a shield sheet provided on a side of the border structure layer away from the magnetic material layer.

[0017] In one embodiment, the shielding sheet is a sheet-like structure made from a metallic material.

[0018] In one embodiment, the shielding sheet is a copper foil.

[0019] In one embodiment, the magnetic material layer is a monolithic sheet-like structure obtained by combining magnetic materials.

[0020] In one embodiment, the magnetic material comprises one or more of a ferrite material, an amorphous / nanocrystalline alloy, a soft magnetic composite material, and a flexible magnetic film.

[0021] In one embodiment, an adhesive layer is provided between the layers of the magnetic shield layer.

[0022] In one embodiment, the positioning magnetic ring includes a plurality of magnetic units, which are arranged in a ring-shaped array.

[0023] In one embodiment, an escape port is provided in an annular array formed by a plurality of said magnetic units.

[0024] In one embodiment, the positioning magnetic ring includes a single-piece ring-shaped magnet.

[0025] In one embodiment, the ring magnet has an escape hole.

[0026] In a second aspect, the present application provides a wireless charging device, the wireless charging device including a magnetic attraction positioning structure and an electromagnetic coil, the magnetic attraction positioning structure being the magnetic attraction positioning structure according to any one of the first aspect; The magnetic shield layer of the magnetic attraction positioning structure covers the electromagnetic coil, and the electromagnetic coil is surrounded by the positioning magnetic ring. [Effects of the Invention]

[0027] The above-mentioned magnetic adsorption positioning structure and wireless charging device have the following beneficial effects. Specifically, the present application provides a magnetic adsorption positioning structure, which includes a magnetic shielding layer and a positioning magnetic ring. The magnetic shielding layer is used to constrain the magnetic field path, suppress the diffusion of the magnetic field, and reduce electromagnetic interference. The positioning magnetic ring is used to adsorb to a magnetic ring of a corresponding device, providing a magnetic adsorption force and fulfilling the functions of positioning and adsorption. The magnetic shielding layer and the positioning magnetic ring are stacked, and the magnetic shielding layer covers the positioning magnetic ring in a direction perpendicular to the stacking arrangement axis, or the positioning magnetic ring has a notch, the magnetic shielding layer is surrounded by the positioning magnetic ring, and the magnetic shielding layer has a protrusion extending to the notch. In practice, while the magnetic shielding layer in conventional designs only covers the bottom of the transmitting coil, in the present application, the magnetic shielding layer extends vertically to the positioning magnetic ring area, so that the magnetic shielding layer can cover the positioning magnetic ring in a direction perpendicular to the stacking arrangement axis. This extended design "tucks" the magnetic field lines generated by the positioning magnetic ring, concentrating them on its surface. This reduces the magnetic field's diffusion to the surrounding area and improves the magnetic flux density, or surface magnetic flux strength, on the surface of the positioning magnetic ring. Meanwhile, while the magnetic field lines of the positioning magnetic ring tend to diverge into space, the extended magnetic shield layer's high permeability allows it to "guide" the magnetic field lines so that they converge along the surface of the magnetic shield layer. This creates a low-magnetic-resistance path around the positioning magnetic ring, allowing more magnetic field lines to concentrate on the adsorption surface of the opposing positioning magnetic ring, improving the magnetic attraction force of the magnetic adsorption positioning structure. Furthermore, covering the positioning magnetic ring with the magnetic shield layer further suppresses magnetic field leakage, reducing interference with the antennas of charging devices such as smartphones and tablets, as well as with magnetic-field-based communication functions such as NFC.As described above, the magnetic attraction positioning structure of the present application satisfies the dimensional constraints of the wireless charging device, and instead of upgrading the magnet material, the magnetic attraction force is strengthened by structural features, thereby controlling the cost of the magnetic attraction positioning structure, thereby improving the assist effect of device alignment during charging, and improving the overall performance of the magnetic attraction positioning and the stability of the charging connection. In order to more clearly explain the embodiments of the present invention or the technical solutions of the prior art, the drawings necessary for describing the embodiments or the prior art will be briefly described. The drawings described below are only shown in the embodiments of the present invention, and it is clear that those skilled in the art can obtain drawings of other embodiments based on these drawings without any creative efforts. [Brief explanation of the drawings]

[0028] [Figure 1] 10 is a distribution diagram illustrating a case where the magnetic shield layer of the magnetic attraction positioning structure is aligned with the edge of the positioning magnetic ring in an embodiment of the present application. [Figure 2] 1 is a schematic diagram of a magnetic attraction positioning structure according to an embodiment of the present application; [Figure 3] 10 is a schematic diagram showing a distribution when the edge of the magnetic shield layer of the magnetic attraction positioning structure in one embodiment of the present application extends to the outside of the edge of the positioning magnetic ring. [Figure 4] 1 is a schematic diagram of a planar configuration of a magnetic attraction positioning structure in an embodiment of the present application in which the positioning magnetic ring has a notch. [Figure 5] 1 is a schematic diagram of the configuration of a wireless charging device in one embodiment of the present application. [Figure 6] 1 is a schematic diagram illustrating the distribution of magnetic lines of force in a magnetic attraction positioning structure according to the prior art exemplified in the present application; [Figure 7] 3 is a schematic diagram illustrating the distribution of magnetic lines of force of a magnetic attraction positioning structure according to an embodiment of the present application. [Figure 8] FIG. 2 is a schematic diagram illustrating a configuration of a magnetic shield layer in an embodiment according to the present application. DETAILED DESCRIPTION OF THE INVENTION

[0029] To facilitate understanding of the present application, the present application will now be described more fully with reference to the associated drawings, in which examples of the present application are shown. However, the present application may be embodied in many different forms and is not limited to the examples set forth herein. Rather, the purpose of providing these examples is to provide a more thorough and complete disclosure of the present application.

[0030] 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 is for the purpose of describing particular examples only and is not intended to be limiting of the application.

[0031] As can be understood, terms such as "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are used only to distinguish a first element from another element. For example, a first resistor can be referred to as a second resistor, and similarly, a second resistor can be referred to as a first resistor, without departing from the scope of the present application. The first resistor and the second resistor are both resistors, but are not the same resistor.

[0032] As can be understood, "connection" in the following examples should be understood as "electrical connection", "communication connection", etc. when the connected circuits, modules, units, etc. have electrical signal or data transmission with each other.

[0033] As will be understood, "at least one" means one or more, and "plurality" means two or more. "At least some of the elements" means some or all of the elements.

[0034] As used herein, the singular forms "a," "an," and "said" can also include the plural forms unless the context clearly dictates otherwise. It should be understood that terms such as "comprise," "include," or "have" specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possible presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Also, as used herein, the term "and / or" includes any and all combinations of the associated listed items.

[0035] Based on the problems described in the background art, the embodiments of the present application provide a magnetic attraction positioning structure and a wireless charging device.

[0036] In one embodiment, the magnetically attractive positioning structure provided by the present application can include a magnetic shield layer 100 and a magnetic positioning ring 200, as shown in FIG.

[0037] The magnetic shield layer 100 is used to restrict the magnetic field path, suppress the diffusion of the magnetic field, and reduce electromagnetic interference.

[0038] The positioning magnetic ring 200 is used to attract the magnetic ring of the corresponding device, provide the magnetic attraction force to the magnetic attraction positioning structure, and realize the function of positioning and attraction.

[0039] Specifically, the magnetic shield layer 100 and the positioning magnetic ring 200 are arranged in a stacked manner, and the magnetic shield layer 100 covers the positioning magnetic ring 200 in a direction perpendicular to the axial direction of the stacked arrangement.

[0040] Specifically, the magnetic shield layer 100 and the positioning magnetic ring 200 are arranged in a stacked configuration, and the magnetic shield layer 100 covers the positioning magnetic ring 200 in a direction perpendicular to the stacked arrangement axis direction in two situations: when the edge of the magnetic shield layer 100 is aligned with the edge of the positioning magnetic ring 200, and when the edge of the magnetic shield layer 100 extends outside the edge of the positioning magnetic ring 200.

[0041] In one embodiment, the edge of the magnetic shield layer 100 is aligned with the edge of the positioning magnetic ring 200. Specifically, as shown in FIGS. 1 and 2, FIG. 1 shows a distribution diagram of the magnetic shield layer 100 of the magnetic attraction positioning structure according to one embodiment of the present application, where the edge of the magnetic shield layer 100 is aligned with the edge of the positioning magnetic ring 200. FIG. 2 shows a schematic diagram of the magnetic attraction positioning structure in a scene where the edges are aligned. Specifically, in this embodiment, the magnetic shield layer 100 and the positioning magnetic ring 200 are both flat sheet-like structures, and the magnetic shield layer 100 and the positioning magnetic ring 200 are stacked in a direction perpendicular to the plane in which they are distributed. This embodiment can be described by taking an example in which a horizontal plane is a reference plane parallel to the magnetic shield layer 100 and the positioning magnetic ring 200. In this manner, the magnetic shield layer 100 described in this embodiment covers the positioning magnetic ring 200 in a direction perpendicular to the stacking axis direction. As a specific example, the magnetic shield layer 100 and the positioning magnetic ring 200 are respectively arranged on two parallel horizontal planes, and are stacked along a vertical axis. In this case, the direction perpendicular to the stacking axis of the magnetic shield layer 100 and the positioning magnetic ring 200 is the horizontal plane. Specifically, in this embodiment, the magnetic shield layer 100 covering the positioning magnetic ring 200 in the direction perpendicular to the stacking axis means that the projection of the magnetic shield layer 100 on the horizontal plane covers the positioning magnetic ring 200. That is, when viewed from a plane or bottom view of one side of the magnetic shield layer 100, the magnetic shield layer 100 covers the positioning magnetic ring 200. In a scene where the magnetic shield layer 100 is aligned with the edge of the positioning magnetic ring 200, the magnetic shield layer 100 is accurately matched to the shape and size of the positioning magnetic ring 200, and the edges of the two are aligned.

[0042] In one embodiment, in a specific example where the edge of the magnetic shield layer 100 is aligned with the edge of the positioning magnetic ring 200, as shown in FIG. 3, a schematic diagram of the distribution of the edge of the magnetic shield layer 100 of the magnetic attraction positioning structure in one embodiment of the present application, extending to the outside of the edge of the positioning magnetic ring 200, is shown. Based on product size constraints, the extension direction of the magnetic shield layer 100 may be the radial direction of the positioning magnetic ring 200, i.e., extending radially in the planar direction of the magnetic shield layer 100. The extension direction of the magnetic shield layer 100 may also be the axial direction of the positioning magnetic ring 200, i.e., extending axially outside the edge of the positioning magnetic ring 200 toward the positioning magnetic ring 200 in the planar direction of the magnetic shield layer 100, thereby forming a three-dimensional covering. In implementation, the extending edge of the magnetic shield layer 100 may adopt a stepped structure, thereby improving the magnetic field attenuation effect at the edge. In other embodiments, the extending edges can be folded inward to form curled edges to further reduce magnetic leakage.

[0043] For example, the specific size of the magnetic shield layer 100 extending from the positioning magnetic ring 200 can be determined by engineers according to the actual application needs, and may be, for example, 1 to 15 mm.

[0044] For example, in a process in which the magnetic shield layer 100 extends outside the edge of the positioning magnetic ring 200, it can be divided into asymmetric extension and symmetric extension, and if there is a need for a shield with a fixed direction, the magnetic shield layer 100 may extend only in a specific direction, for example, to the side closer to the sensitive element and extend from the positioning magnetic ring 200.

[0045] For example, the edge extension of the magnetic shield layer 100 can be realized by embedding or compounding other magnetic shield materials, for example, high-permeability alloy wires such as permalloy wires, to form a local magnetic field absorption network, which can further absorb the amount of magnetic flux diffused at the edge and reduce leakage at the edge.

[0046] For example, if the edge of the magnetic shield layer 100 extends to the outside of the edge of the positioning magnetic ring 200, the magnetic shield layer 100 can further localize the magnetic field, suppress the diffusion of the magnetic flux at the edge of the positioning magnetic ring 200, further enhance the magnetic adsorption force of the magnetic adsorption positioning structure, and further reduce the coupling interference caused by the external magnetic field on the positioning magnetic ring 200-electromagnetic coil 300 system.

[0047] In one embodiment, in a specific example where the magnetic shield layer 100 is surrounded by the positioning magnetic ring 200, the positioning magnetic ring may have a notch 210. Specifically, as shown in FIG. 4, a schematic diagram of a planar configuration of a magnetic attraction positioning structure in an embodiment of the present application where the positioning magnetic ring 200 has the notch 210 is shown. Specifically, when the positioning magnetic ring 200 has the notch 210, the magnetic shield layer 100 may have a protrusion 140 extending to the notch 210 accordingly. In this case, the protrusion 140 on the magnetic shield layer 100 can fill the space formed by the notch 210 on the positioning magnetic ring 200, thereby assisting in adjusting the local magnetic field of the magnetic attraction positioning structure and increasing the amount of local magnetic flux. Furthermore, the combination structure of the cutout portion 210 and the protrusion 140 strengthens the mechanical combination relationship between the positioning magnetic ring 200 and the magnetic shield layer 100 in the physical structural dimension, strengthens the relative positional relationship between the positioning magnetic ring 200 and the magnetic shield layer 100, and reduces the possibility of misalignment due to rotation or sliding.

[0048] Specifically, in the manufacturing process of the positioning magnetic ring 200 and the magnetic shield layer 100, the notch 210 can be manufactured by methods such as pressing, milling, laser cutting, die forming, etc., and the protrusion 140 can be directly formed in a mold during press forming, deep drawing, or injection molding, or can be realized by subsequent machining. The notch 210 can be a U-shaped groove, a square groove, a chamfered groove, a circular notch, a half-moon notch, a trapezoidal or polygonal notch, etc., and the specific structure of the notch 210 can be determined by engineers according to application needs. The protrusion 140 can be a protrusion corresponding to the shape of the notch 210, such as a rectangular protrusion, a semicircular protrusion, a trapezoidal protrusion, etc.

[0049] By realizing the above-described magnetic attraction positioning structure, the following beneficial effects can be achieved. This application provides a magnetic attraction positioning structure for use in a wireless charging device. Specifically, as shown in FIG. 5, a schematic diagram of the integrated structure of a wireless charging device is shown. Specifically, the integrated structure of the wireless charging device exemplified in the embodiments of this application includes a power transmitting side (TX side) and a power receiving side (RX side). The TX side is the transmitting part of the wireless charging system, and is used to generate an alternating electromagnetic field and transmit electrical energy via electromagnetic coupling or magnetic induction. The RX side is used to receive electromagnetic energy from the TX side, convert it into electrical energy, and supply it to a load (e.g., a smartphone, a battery, etc.). Specifically, the magnetic attraction positioning device shown in the embodiments of this application may be installed on the RX side.

[0050] In the embodiments, as shown in FIGS. 6 and 7, FIG. 6 shows a schematic diagram of the distribution of magnetic field lines in a conventional magnetic attraction positioning structure. FIG. 7 shows a schematic diagram of the distribution of magnetic field lines in a magnetic attraction positioning structure in one embodiment of the present application. Specifically, in conventional designs, the magnetic shield layer 100 only covers the bottom of the transmitting coil. In this case, the magnetic field lines generated by the positioning magnetic ring 200 and the magnetic ring of the corresponding device are partially absorbed by the surface of the positioning magnetic ring 200 and partially diffuse outward. In the present application, the magnetic shield layer 100 extends vertically to the region of the positioning magnetic ring 200, allowing the magnetic shield layer 100 to cover the positioning magnetic ring 200 in a direction perpendicular to the stacking axis. In this case, such an extended design "compresses" the magnetic field lines generated by the positioning magnetic ring 200 and concentrates them on its surface, reducing the diffusion of the magnetic field to the surroundings and increasing the magnetic flux density on the surface of the positioning magnetic ring 200, i.e., increasing the surface magnetic strength of the positioning magnetic ring 200. While the magnetic field lines of the positioning magnetic ring 200 would normally diffuse in space, the extending magnetic shield layer 100 has high magnetic permeability and can "guide" the magnetic field lines so that they converge along the surface of the magnetic shield layer 100. This is equivalent to creating a low-magnetic-resistance path around the positioning magnetic ring 200, concentrating more magnetic field lines on the adsorption surface of the opposing positioning magnetic ring 200 and enhancing the magnetic attraction force of the magnetic adsorption positioning structure. Covering the positioning magnetic ring 200 with the magnetic shield layer 100 further suppresses magnetic field leakage, reducing interference with antennas and magnetic-field communication functions such as NFC on charging devices such as smartphones and tablets. As described above, the magnetic adsorption positioning structure of the present application satisfies the dimensional constraints of wireless charging devices, while achieving the effect of strengthening the magnetic attraction force through structural features rather than upgrading the magnet material, thereby controlling the cost of the magnetic adsorption positioning structure. This enhances the device alignment assistance effect during charging, improving the overall performance of the magnetic adsorption positioning system and the stability of the charging connection.

[0051] In one embodiment, as shown in Figure 8, a schematic diagram of the configuration of a magnetic shield layer in one embodiment of the present application is shown in Figure 8. Specifically, the magnetic shield layer 100 is a multi-layer composite structure mainly made of a material with high magnetic permeability, and can include an edge structure layer 110 and a magnetic material layer.

[0052] The edging structure layer 110 is provided on both the top and bottom sides of the magnetic material layer 120. The edging structure layer 110 is used to increase the mechanical strength of the structure of the magnetic shield layer 100 and reduce magnetic leakage at the edges, thereby constraining the magnetic force path within the range of the magnetic shield layer 100. Furthermore, the edging structure layer 110 can provide an insulating protection effect for the internal structure of the magnetic shield layer 100.

[0053] For example, the specific shape and manufacturing material of the border structure layer 110 are adapted to actual application needs. The specific shapes and manufacturing materials of different border structure layers 110 are independent of each other and may be made of the same material or different types of materials. For example, since the border structure layer 110 has high mechanical strength and can help suppress magnetic leakage, the manufacturing material of the border structure layer 110 can be selected from the following several materials, such as thermoplastic polymers based on PPS (polyphenylene sulfide), PA6T (heat-resistant nylon), LCP (liquid crystal polymer), etc., and polymers filled with glass fiber (to improve rigidity) and magnetic powder (e.g., FeSiAl, to improve edge shielding), and epoxy resin + hardener (e.g., Examples include mold-pressed epoxy resin edge wraps, such as polymers with a bisphenol A base and modifiers of Al2O3 powder (thermal conductivity) and carbon fiber (electrical conductivity, suppressing edge eddy currents); magnetic polymer composites, such as TPU (thermoplastic polyurethane) base materials and sheet carbonyl iron powder as functional fillers; and UV-cured acrylate edge wraps, such as polymers with acrylate resin + nano-SiO2 (improved wear resistance) as UV adhesive and carbon nanotubes (0.5 wt%, electrostatic conductivity) as additives. Other possible means are similar to those mentioned above and can be selected by engineers according to the actual application scenario, so they will not be repeated here.

[0054] As shown in FIG. 8 , the magnetic material layer 120 includes a first covering layer 121, an intermediate layer 122, and a second covering layer 123, which are stacked in sequence. In one embodiment, the area of ​​the intermediate layer 122 is smaller than the areas of the first covering layer 121 and the second covering layer 123, and the first covering layer 121 and the second covering layer 123 respectively cover the intermediate layer 122 from both sides, forming a "sandwich-like" laminated structure. Specifically, the first covering layer 121, the intermediate layer 122, and the second covering layer 123 may each comprise a single layer of magnetic material sheet, or may be formed by combining multiple magnetic material sheets. The number of magnetic material sheets among the first covering layer 121, the intermediate layer 122, and the second covering layer 123 is independent of each other. In practice, the number of magnetic material sheets combined in each of the first covering layer 121, the intermediate layer 122, and the second covering layer 123 can be determined by engineers based on application needs, such as product thickness and magnetic shielding performance.

[0055] Specifically, the magnetic material sheet may be made of a magnetic material. The magnetic material may include ferrite materials, amorphous / nanocrystalline alloys, soft magnetic composite materials, flexible magnetic films, etc. Specifically, the magnetic material sheet may be made of a single magnetic material or a combination of multiple magnetic materials. This allows the magnetic material sheet to meet the needs of different application scenarios, such as magnetic shielding performance, mechanical strength, corrosion resistance, and heat resistance. The specific manufacturing composition can be determined by engineers according to the actual application needs, and will not be repeated in this embodiment.

[0056] Specifically, for example, the magnetic material sheet may be a nanochip made of a nanocrystalline alloy material, and multiple layers of the magnetic material sheet may be combined with the first coating layer 121, the intermediate layer 122, and the second coating layer 123 accordingly, for example, two layers of nanochips may be combined with the first coating layer 121, three layers of nanochips may be combined with the intermediate layer 122, and five layers of nanochips may be combined with the second coating layer 123. In this way, the first coating layer 121, the intermediate layer 122, and the second coating layer 123 may be obtained by combining multiple layers of the magnetic material sheet, and the stacked structure of the first coating layer 121, the intermediate layer 122, and the second coating layer 123 may be adjusted according to actual usage needs, thereby improving the flexibility of structural design.

[0057] Specifically, for example, in the processing of the first coating layer 121, intermediate layer 122, and second coating layer 123 obtained by compounding magnetic material sheets, the compounding process between the magnetic material sheets can be selected according to application needs, such as laminated adhesive compounding, magnetic film deposition compounding, woven fiber compounding, powder sintered compounding, gradient material compounding, etc. Furthermore, the above-mentioned compounding process can be determined by the engineer according to application needs during implementation, and can be one of them, such as laminated adhesive compounding, or a combination of multiple processes, such as laminated adhesive compounding and gradient material compounding.

[0058] In one embodiment, as shown in Figure 4, a schematic plan view of the magnetic attraction positioning structure in one embodiment of the present application is shown. Specifically, the positioning magnetic ring 200 is used to attract the magnetic ring of a corresponding device, provide a magnetic attraction force to the magnetic attraction positioning structure, and realize the positioning and attraction function.

[0059] Specifically, the positioning magnetic ring 200 may include a plurality of magnetic units 220, each of which may be obtained by sintering a permanent magnetic material such as neodymium iron boron (NdFeB) to meet predetermined size and geometric shape needs. During the manufacturing process of the positioning magnetic ring 200, the magnetic units 220 are arranged in an annular array along the magnetic ring, and undergo a pre-processing of magnetization along the axial direction of the magnetic ring to form a unipolar or multipolar distributed magnetic field.

[0060] A permanent magnet material may refer to a type of functional material that maintains strong magnetism for a long period of time after magnetization and is resistant to demagnetization, and its important properties include high remanence (Br), high coercive force (Hc), and high magnetic energy product ((BH)max).

[0061] Illustratively, the permanent magnet material may include metallic permanent magnet materials such as aluminum nickel cobalt (AlNiCo), samarium cobalt (SmCo), rare earth permanent magnet materials such as neodymium iron boron (NdFeB), samarium iron nitrogen (SmFeN), ferrite permanent magnet materials such as strontium / barium ferrite, and other novel composite permanent magnet materials such as Mn-Al-C alloys, nanocomposite permanent magnets.

[0062] In one embodiment, because the magnetic shield layer 100 and the positioning magnetic ring 200 are installed inside the wireless charging module, their structure, shape, etc. are limited by the structure of the wireless charging module itself. For example, they may need to operate in conjunction with associated devices such as the electromagnetic coil 300, and the connectors or coils of the associated devices, such as the electromagnetic coil 300, may need to be embedded in the magnetic shield layer 100. In such situations, it may be difficult for the magnetic shield layer 100 to maintain a regular shape, such as a circle or a rectangle. In view of the above, FIG. 4 shows a schematic planar view of a magnetic attraction positioning structure in one embodiment of the present application. Specifically, the magnetic attraction positioning structure provided in this embodiment has an escape opening 230 in a ring-shaped array formed by a plurality of the magnetic units 220. In this way, the escape opening 230 allows the positioning magnetic ring 200 to form a flexible and controllable space, thereby allowing the positioning magnetic ring 200 to retreat from other module structures or further reducing the thickness of the magnetic attraction positioning structure.

[0063] For example, the escape opening 230 may be formed on the edge of the positioning magnetic ring 200, i.e., the escape opening 230 is formed on the edge of the positioning magnetic ring 200 to allow escape from modular structures such as the interface of the electromagnetic coil 300. The escape opening 230 may be rectangular, circular, triangular, etc., and the specific shape and structure can be determined by engineers according to application needs. The escape opening 230 may also be formed inside the positioning magnetic ring 200, i.e., a through-hole is formed in the center of the positioning magnetic ring 200 to meet application needs, thereby meeting the need to create space in the center of the magnetic attraction positioning structure. In the applications of the above two types of escape openings 230, opening the escape opening 230 in the positioning magnetic ring 200 may cause edge burrs on the magnetic attraction positioning structure, which may cause structural instability. Therefore, the escape opening 230 of the positioning magnetic ring 200 may be dulled accordingly. For example, the blunting process may refer to processing the corners of the escape opening 230 to convert the acute angle structure therein into a blunt angle, or to adding a chamfer structure to the corner of the cross section of the escape opening 230 to convert the corner from a right angle to a chamfered angle. In this way, even if escape openings 230 of various shapes are added, the effect of reducing edge burrs on the positioning magnetic ring 200 can be maintained.

[0064] In this embodiment, the escape holes 230 are provided in the annular array formed on the magnetic unit 220 of the positioning magnetic ring 200, which contributes to improving the application flexibility of the magnetic attraction positioning structure.

[0065] Based on the concept of a similar invention, an embodiment of the present application further provides a wireless charging device, which includes a magnetic adsorption positioning structure and an electromagnetic coil 300, and the magnetic adsorption positioning structure is the magnetic adsorption positioning structure described in any of the above embodiments.

[0066] Specifically, the magnetic shield layer 100 of the magnetic attraction positioning structure covers the electromagnetic coil 300 , and the electromagnetic coil 300 is surrounded by the positioning magnetic ring 200 .

[0067] The electromagnetic coil 300 is used to convert electrical energy into a magnetic field and realize wireless transmission of electrical energy through electromagnetic induction. Specifically, the electromagnetic coil 300 can be realized using a variety of selectable structural types, such as a wire-wound topology structure or a coil-molded structure. For example, the wire-wound topology structure may include a multilayer progressive spiral winding. In this example, the electromagnetic coil 300 may be formed by winding multiple layers of multilayer rectangular copper foil wire. Adjacent layers may be separated by a heat-resistant polyimide insulating film, and the turn spacing of each layer may increase gradually from the inside to the outside. For example, the turn spacing of the inner layer is 0.1 mm, and the turn spacing of the outer layer is 0.3 mm.

[0068] For example, the coil molding structure may be formed by forming a wiring pattern on copper foil using a photolithography process, laminating multiple layers of wiring and insulating films alternately, and then heat-pressing and curing the resulting structure to form an integrated winding module. The winding module may then be embedded in the internal cavity of the magnetic shield layer 100 and sealed with epoxy resin or the like. Note that the electromagnetic coil 300 may also be realized by, for example, segment winding, flexible coil, or other methods; other possible methods are similar to those in this embodiment and will not be described again here.

[0069] It is understood that the magnetic attraction positioning structure and the wireless charging device are not limited to the forms described in the above embodiments, and may have other forms, and any form that can achieve the function of increasing the stability of magnetic attraction is included in the present application.

[0070] In the description herein, the terms "some embodiments," "other embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present application. Note that these terms do not necessarily refer to the same embodiment or example, even if used in different contexts.

[0071] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all combinations of the technical features in the above-described embodiments are described, but any combination of these technical features should be considered within the scope of the present specification unless there is a contradiction.

[0072] The above examples merely illustrate some embodiments of the present application, and although the descriptions are specific and detailed, they should not be construed as limiting the scope of protection of the invention. Those skilled in the art may make minor modifications and improvements without departing from the spirit of the present application, and all of these modifications and improvements are within the scope of protection of the invention. Therefore, the scope of protection of the invention should be governed by the claims. [Explanation of symbols]

[0073] 100···Magnetic shield layer, 110···Edge structure layer, 120···Magnetic material layer, 121···First coating layer, 122···Intermediate layer, 123···Second coating layer, 140···Protrusion, 200···Positioning magnetic ring, 210···Notch portion, 220···Magnetic unit, 230···Escape port, 300···Electromagnetic coil.

Claims

1. A magnetic attraction positioning structure, the magnetic attraction positioning structure includes a magnetic shield layer and a positioning magnetic ring; The magnetic shield layer and the positioning magnetic ring are arranged in a stacked manner, and the magnetic shield layer covers the positioning magnetic ring in a direction perpendicular to the stacked arrangement axis direction, or A magnetic adsorption positioning structure, characterized in that the positioning magnetic ring has a notch, the magnetic shield layer is surrounded inside the positioning magnetic ring, and the magnetic shield layer has a protrusion extending to the notch.

2. The magnetic shield layer covers the positioning magnetic ring in a direction perpendicular to the stacking axis direction, The edge of the magnetic shield layer is aligned with the edge of the magnetic positioning ring; or 2. The magnetic attraction positioning structure according to claim 1, wherein the edge of the magnetic shield layer extends to the outside of the edge of the positioning magnetic ring.

3. 3. The magnetic attraction positioning structure according to claim 2, wherein the edge of the magnetic shield layer protrudes from the edge of the positioning magnetic ring by 1 to 15 mm.

4. 2. The magnetic attraction positioning structure according to claim 1, wherein the protrusion of the magnetic shield layer is disposed in the notch.

5. the magnetic shield layer includes an edge structure layer and a magnetic material layer; 2. The magnetic attraction positioning structure according to claim 1, wherein the border structure layer is provided on both sides of the magnetic material layer.

6. 6. The magnetic attraction positioning structure according to claim 5, wherein the magnetic material layer is an integrated sheet-like structure obtained by compounding magnetic materials.

7. 7. The magnetic attraction positioning structure according to claim 6, wherein the magnetic material comprises one or a combination of ferrite material, amorphous / nanocrystalline alloy, soft magnetic composite material, and flexible magnetic film.

8. 6. The magnetic attraction positioning structure according to claim 5, wherein an adhesive layer is provided between the layers of the magnetic shield layer.

9. 2. The magnetic attraction positioning structure according to claim 1, wherein the positioning magnetic ring includes a plurality of magnetic units, and the plurality of magnetic units are arranged in a ring-shaped array.

10. 10. The magnetic attraction positioning structure according to claim 9, wherein an escape opening is provided in the annular array formed by the plurality of magnetic units.

11. A wireless charging device, The wireless charging device includes a magnetic attraction positioning structure and an electromagnetic coil, the magnetic attraction positioning structure being the magnetic attraction positioning structure according to any one of claims 1 to 10, The magnetic shielding layer of the magnetic attraction positioning structure covers the electromagnetic coil, and the electromagnetic coil is surrounded by the positioning magnetic ring.

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