Wireless charging device, manufacturing method thereof and wireless charging system

Abstract

The invention belongs to the technical field of wireless charging, and discloses a wireless charging device, a manufacturing method thereof and a wireless charging system. The wireless charging device comprises a coil body, a ferrite enhancement layer, a graphene middle layer and a micro-channel shielding plate which are sequentially arranged in a stacked mode, the coil body is fixed to the surface of the ferrite enhancement layer through heat conduction gel, and gaps between the coil body and the ferrite enhancement layer and gaps between turns of wires in the coil body are filled with the heat conduction gel; the ferrite enhancement layer is bonded and fixed on the surface of the graphene middle layer; the graphene middle layer is bonded and fixed on the surface of the micro-channel shielding plate, and a cooling channel for cooling liquid to flow through is arranged in the micro-channel shielding plate. The wireless charging system comprises the wireless charging device. The high-power wireless charging device has efficient heat dissipation capacity and excellent electromagnetic shielding performance, heat transfer is more efficient while the loss of the coil system is reduced, and the heat dissipation requirement of the high-power wireless charging device can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless charging, in particular to a wireless charging device, a manufacturing method thereof and a wireless charging system. BACKGROUND

[0002] With the increasing popularity of wireless charging technology, the application demand of high-power wireless charging technology is increasing. However, under high-power working conditions, the wireless charging coil generates a large amount of heat due to high-frequency current loss, magnetic core loss, and electromagnetic shielding layer eddy current effect. If the heat dissipation effect is not good, it will cause problems such as coil resistance increase, magnetic core performance deterioration, and insulation material aging, which has a great safety hazard. In the prior art, the heat dissipation scheme of the wireless charging coil mostly uses conventional heat-conducting materials or forced air convection heat dissipation scheme, which has the problems of single heat transfer path, high thermal resistance, uneven coil heat dissipation, and insufficient heat dissipation capacity. At the same time, the heat dissipation design of the traditional wireless charging device often ignores the synergistic optimization of electromagnetic performance and heat dissipation performance, and it is difficult to meet the dual demands of low loss and high efficient heat dissipation under high-power scenarios.

[0003] Therefore, there is an urgent need for a wireless charging device, a manufacturing method thereof and a wireless charging system to solve the above technical problems. SUMMARY

[0004] The present application provides a wireless charging device, a manufacturing method thereof and a wireless charging system, which can construct an efficient and low-resistance heat dissipation path, optimize the electromagnetic shielding performance at the same time, solve the coil heat dissipation problem under high-power application scenarios, improve the structure and heat dissipation reliability of the wireless charging device, and improve the power transmission efficiency of the wireless charging system.

[0005] A wireless charging device includes a coil body, a ferrite enhancement layer, a graphene intermediate layer and a micro-channel shielding plate which are sequentially stacked, the coil body is fixed to the surface of the ferrite enhancement layer through a heat-conducting gel, the heat-conducting gel fills the gap between the coil body and the ferrite enhancement layer and the gap between the turns of wire in the coil body; the ferrite enhancement layer is adhesively fixed to the surface of the graphene intermediate layer; the graphene intermediate layer is adhesively fixed to the surface of the micro-channel shielding plate, and the micro-channel shielding plate is provided with a cooling channel for cooling liquid to flow through.

[0006] In some embodiments, the coil body is wound by a wire made of oxygen-free copper material, the surface of the wire is plated with a graphene plating layer, and the surface of the graphene plating layer is dip-coated with an insulating paint.

[0007] In some embodiments, the graphene coating is attached to the surface of the conductive wire by chemical vapor deposition, and the thickness of the graphene coating is 0.05-0.2 microns; and / or, the material of the insulating paint is polyimide or polyurethane, and the thickness of the insulating paint is 2-4 microns.

[0008] In some embodiments, the filling thickness of the thermally conductive gel in the gap between the conductive wires is not less than 50% of the diameter of the conductive wire.

[0009] In some embodiments, the ferrite reinforcing layer is adhered to the graphene intermediate layer by silicone pressure-sensitive adhesive.

[0010] In some embodiments, the material of the ferrite reinforcing layer is manganese-zinc ferrite or nickel-zinc ferrite, and the thickness of the ferrite reinforcing layer is not less than 500 microns; and / or, the thickness of the graphene intermediate layer is 10-50 microns.

[0011] In some embodiments, the side of the micro-channel shielding plate facing away from the graphene intermediate layer is provided with honeycomb-shaped grooves.

[0012] In some embodiments, the material of the micro-channel shielding plate is aluminum alloy; and / or, the thickness of the micro-channel shielding plate is 1-3 millimeters; and / or, the porosity of the honeycomb-shaped grooves on the micro-channel shielding plate is 60%-80%.

[0013] A wireless charging system includes a wireless charging transmitting device and a wireless charging receiving device, at least one of the wireless charging transmitting device and the wireless charging receiving device adopts the wireless charging device of any one of the above solutions.

[0014] A method for manufacturing a wireless charging device includes:

[0015] Coating a graphene coating on the surface of a conductive wire, dipping insulating paint on the surface of the graphene coating, and winding a coil body according to design parameters;

[0016] Processing a micro-channel shielding plate, forming cooling channels for cooling liquid to flow through in the micro-channel shielding plate, and forming honeycomb-shaped grooves on one side of the micro-channel shielding plate;

[0017] Adhering a graphene intermediate layer to the side of the micro-channel shielding plate facing away from the honeycomb-shaped grooves;

[0018] Adhering a ferrite reinforcing layer to the surface of the graphene intermediate layer;

[0019] Fixing the wound coil body to the surface of the ferrite reinforcing layer by thermally conductive gel, so that the thermally conductive gel fills the gap between the coil body and the ferrite reinforcing layer and the gap between the conductive wires in each turn of the coil body.

[0020] The application has the following beneficial effects:

[0021] The wireless charging device provided by the application has high heat dissipation capacity and excellent electromagnetic shielding performance. The coil body and the ferrite reinforcing layer are fixed by the heat-conducting gel, which can fill the small gaps between the coil body and the ferrite reinforcing layer and the gaps between the turns of the coil body. In this way, the coil body and the ferrite reinforcing layer can be firmly bonded, and the heat-conducting gel has good heat conduction performance, which is beneficial to efficiently dissipating the heat generated by the coil body and forming a low-resistance heat conduction path. The graphene intermediate layer and the micro-channel shielding plate are arranged to form a "magnetic-electric" double shielding, reduce spatial electromagnetic interference, improve electromagnetic shielding efficiency, reduce eddy current loss of the shielding structure, and effectively improve the electromagnetic compatibility of the wireless charging device. Moreover, the graphene intermediate layer can make the heat flow received by the micro-channel shielding plate more balanced, improve the uniformity of the coil heat dissipation, and the cooling liquid flowing through the micro-channel shielding plate can realize efficient liquid cooling.

[0022] Based on the multi-dimensional heat dissipation cooperative scheme of the heat-conducting gel filling the coil body, the graphene intermediate layer balancing the heat flow, and the micro-channel shielding plate liquid cooling, the application constructs a composite heat transfer path of "coil heat source-high efficient heat conduction-flat temperature distribution-liquid cooling heat dissipation". Compared with the traditional self-cooling, air cooling and conventional water cooling structure, the heat transfer is more efficient while reducing the coil system loss, which can meet the heat dissipation demand of the high-power wireless charging device.

[0023] Compared with the traditional wireless charging structure, the application can realize more excellent heat dissipation and electromagnetic shielding effect, which is beneficial to enhancing the power transmission efficiency, thermal management performance, electromagnetic compatibility and safety of the wireless charging system, and is particularly suitable for high-power wireless charging systems, and has important application value and broad application prospect in the field of wireless charging technology. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the isometric view of the wireless charging device provided by the embodiment of the application;

[0025] Figure 2 is the exploded view of the wireless charging device provided by the embodiment of the application;

[0026] Figure 3 is the cross-sectional view of the wireless charging device provided by the embodiment of the application;

[0027] Figure 4 is Figure 3 is the local enlarged view of A in FIG. 6;

[0028] Figure 5 is the cross-sectional view of the wire plated with the graphene plating layer provided by the embodiment of the application;

[0029] Figure 6 is Figure 5 is a local enlarged view at B in FIG. 1;

[0030] Figure 7 is a structural schematic view of a micro-channel shielding plate provided by an embodiment of the present application (partly cutaway);

[0031] Figure 8 is a front view of a cooling channel in the micro-channel shielding plate provided by an embodiment of the present application;

[0032] Figure 9 is a structural schematic view of a honeycomb-shaped groove on the back of the micro-channel shielding plate provided by an embodiment of the present application;

[0033] Figure 10 is a flow chart of a manufacturing method of a wireless charging device provided by an embodiment of the present application.

[0034] in the figure:

[0035] 1, coil body; 11, wire; 2, ferrite reinforcing layer; 3, graphene intermediate layer; 4, micro-channel shielding plate; 41, cooling channel; 42, honeycomb-shaped groove; 5, heat-conducting gel; 6, silicone pressure-sensitive adhesive; 7, graphene plating layer; 8, insulating paint. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar parts or parts having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0037] In the description of the present application, unless explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] like Figures 1 to 9 As shown, this embodiment provides a wireless charging device that, through material optimization and structural design, can synergistically improve heat dissipation efficiency and enhance electromagnetic shielding performance, making it suitable for high-power scenarios. Specifically, the wireless charging device of this embodiment can be applied to automotive wireless charging systems, high-power mobile electronic devices, portable power supplies with wireless charging capabilities, and other industrial equipment wireless charging fields.

[0041] The wireless charging device provided in this embodiment includes a coil body 1, a ferrite reinforcement layer 2, a graphene intermediate layer 3, and a microchannel shielding plate 4 stacked sequentially. The coil body 1 is fixed to the surface of the ferrite reinforcement layer 2 by thermally conductive gel 5, which fills the gap between the coil body 1 and the ferrite reinforcement layer 2, as well as the gap between each turn of the wire 11 in the coil body 1. The ferrite reinforcement layer 2 is bonded and fixed to the surface of the graphene intermediate layer 3 and is used to suppress magnetic leakage. The graphene intermediate layer 3 is bonded and fixed to the surface of the microchannel shielding plate 4. The microchannel shielding plate 4 has a cooling channel 41, and the microchannel shielding plate 4 is efficiently liquid-cooled by the coolant flowing through the cooling channel 41.

[0042] The wireless charging device provided by the embodiment has high heat dissipation capacity and excellent electromagnetic shielding performance. The heat-conductive gel 5 is arranged to realize the close adhesion between the coil body 1 and the ferrite reinforcing layer 2. The heat-conductive gel 5 can fill the small gaps between the coil body 1 and the ferrite reinforcing layer 2 and the gaps between the turns of conductive wire 11 in the coil body 1. In this way, the adhesion between the coil body 1 and the ferrite reinforcing layer 2 can be ensured, and the heat-conductive gel 5 has good heat conduction performance, with a heat conductivity coefficient not less than 3 W / (m*K), which is conducive to the efficient heat dissipation of the coil body 1 and forms a low-resistance heat conduction path. The graphene intermediate layer 3 and the micro-channel shielding plate 4 are arranged to form a “magnetic-electric” double shielding, reduce spatial electromagnetic interference, improve electromagnetic shielding performance, reduce eddy current loss of the shielding structure, and effectively improve the electromagnetic compatibility of the wireless charging device. Moreover, the graphene intermediate layer 3 can make the heat flow received by the micro-channel shielding plate 4 more balanced, improve the uniformity of coil heat dissipation, and realize efficient liquid cooling by the cooling liquid flowing in the micro-channel shielding plate 4.

[0043] Therefore, the multi-dimensional heat dissipation cooperative scheme based on the heat-conductive gel 5 filling the coil body 1, the graphene intermediate layer 3 balancing heat flow, and the micro-channel shielding plate 4 liquid cooling is constructed to form a composite heat transfer path of “coil heat source-high efficient heat conduction-flat temperature distribution-liquid cooling heat dissipation”. Compared with the traditional self-cooling, air cooling and conventional water cooling structure, the heat transfer is more efficient while reducing the coil system loss, which can meet the heat dissipation demand of the high-power wireless charging device.

[0044] Optionally, in the embodiment, the coil body 1 is wound by a wire 11 of high-purity oxygen-free copper material into a planar spiral ring structure. The wire 11 is made of high-purity oxygen-free copper, so that the coil body 1 has excellent electrical conductivity and thermal conductivity, and has the characteristics of low magnetism; and the winding into a planar spiral ring structure makes the structure of the wireless charging device more flat and compact, which is beneficial to reduce the occupied space. Further, the surface of the wire 11 of oxygen-free copper material for winding the coil is also plated with a graphene plating layer 7. The thermal conductivity of graphene is not less than 5000 W / (m*K), and the graphene plating layer 7 on the surface of the wire 11 can quickly remove heat, and the graphene plating layer 7 can alleviate the influence of skin and proximity effect and reduce the high-frequency loss of the wire 11. Optionally, the graphene plating layer 7 is uniformly attached to the surface of the wire 11 by chemical vapor deposition (CVD) to improve the uniformity of heat conduction. Optionally, the thickness of the graphene plating layer 7 is 0.05-0.2 microns, for example, the thickness of the graphene plating layer 7 can be controlled to about 0.1 microns. Further, the wire 11 is also immersed and coated with insulating paint 8 after graphene plating to isolate the wire 11 from direct contact with the external environment, effectively preventing oxidation and corrosion, and prolonging the service life of the wire 11. Specifically, the material of the insulating paint 8 can be polyimide or polyurethane. Optionally, the thickness of the insulating paint 8 is 2-4 microns, for example, it can be set to 3 microns. It should be noted that the number of turns, wire diameter and wire spacing of the wire 11 in the coil body 1 can be set according to the design requirements of wireless charging, and the embodiment does not limit this.

[0045] In the embodiment, the material of the heat-conducting gel 5 is preferably a type with a large thermal conductivity and considering the cost. Optionally, the heat-conducting gel 5 is a silicon-based heat-conducting gel, which has good thixotropy and adhesion, is not easy to flow outward during use, and is convenient for filling the gap, can improve the heat transfer performance, and is convenient for better transferring the heat generated by the coil body 1 to the ferrite reinforcing layer 2. Further, the filling thickness of the heat-conducting gel 5 to the gap between the wires 11 is not less than 50% of the diameter of the wire 11, so that the adhesion firmness and heat conduction reliability of the coil body 1 and the ferrite reinforcing layer 2 can be ensured.

[0046] In the embodiment, the ferrite reinforcing layer 2 is in a ring sheet structure, and the material thereof can be selected from manganese-zinc ferrite or nickel-zinc ferrite. Specifically, when the ferrite reinforcing layer 2 is used in a low-frequency working condition, the material thereof is preferably manganese-zinc ferrite; and when the ferrite reinforcing layer 2 is used in a high-frequency working condition, the material thereof is preferably nickel-zinc ferrite. Alternatively, the thickness of the ferrite reinforcing layer 2 is not less than 500 microns, so as to play a good effect of suppressing magnetic leakage. Further, the ferrite reinforcing layer 2 and the graphene intermediate layer 3 are bonded and fixed through the silicone pressure-sensitive adhesive 6. The silicone pressure-sensitive adhesive 6 is a special adhesive, which has good bonding capacity, heat conduction capacity and electrical insulation performance, and can make the wireless charging device have excellent heat conduction and structural reliability. Specifically, the silicone pressure-sensitive adhesive 6 is preferably of a type with small thickness and large thermal conductivity, so as to reduce the volume of the wireless charging device.

[0047] In the embodiment, the micro-channel shielding plate 4 has the functions of electromagnetic shielding and liquid cooling heat dissipation, and the material thereof can be selected from aluminum alloy, and specifically can be 6-series aluminum alloy or 7-series aluminum alloy, so as to ensure the characteristics of light weight and high strength. For example, the material of the micro-channel shielding plate 4 in the embodiment is heat-treated 6061 aluminum alloy. The thickness of the micro-channel shielding plate 4 can be selected from 1 to 3 millimeters.

[0048] The front surface of the micro-channel shielding plate 4 is fixed with the graphene intermediate layer 3 through an adhesive. The graphene intermediate layer 3 is in a sheet structure, and the shape thereof is adapted to the shape of the micro-channel shielding plate 4. The thickness of the graphene intermediate layer 3 is 10 to 50 microns, so as to ensure good heat conductivity, mechanical strength and flexibility. The back surface of the micro-channel shielding plate 4 is further provided with a honeycomb-shaped groove 42, which functions to buffer mechanical stress caused by vibration, drop and collision, and the honeycomb-shaped groove can be filled with polyurethane foam and other materials to further improve the energy absorption characteristics. Preferably, the porosity of the honeycomb-shaped groove 42 on the micro-channel shielding plate 4 is 60% to 80%, so as to improve the buffering performance of mechanical stress and improve the mechanical reliability and long-term working stability of the wireless charging device.

[0049] Specifically, the micro-channel shielding plate 4 of the embodiment includes a bottom plate and a cover plate, wherein the bottom plate is formed with cooling channels 41 and honeycomb grooves 42 through an extrusion forming process, and then the bottom plate is integrated with the cover plate through a vacuum brazing process. The plugs, water nozzles and other accessory structures of the micro-channel shielding plate 4 can be connected to the inlet and outlet ends of the cooling channels 41 through cold metal transfer welding, which will not be described in detail in the embodiment. Further, the cooling channels 41 can be straight channels, annular channels, U-shaped channels, S-shaped channels or channels of other shapes. Preferably, the micro-channel shielding plate 4 of the embodiment is a rectangular plate, and the cooling channels 41 include a plurality of parallel straight strip-shaped channels, each of which extends along the length direction or the width direction of the micro-channel shielding plate 4, and the cross section of the straight strip-shaped channel is rectangular. In actual application, in order to ensure the structure and heat dissipation reliability of the micro-channel shielding plate 4, the micro-channel shielding plate 4 needs to be detected for heat resistance, pressure drop, voltage resistance and air tightness before use; and the electronic fluorinated liquid is preferably used as the cooling liquid in the embodiment considering the chemical stability, thermal stability, electrical insulation and environmental friendliness of the cooling liquid.

[0050] The heat transfer process of the wireless charging device provided by the embodiment is as follows: the heat generated by the coil body 1 is uniformly heated through the graphene plating layer 7, then is conducted to the ferrite reinforced layer 2 through the heat-conducting gel 5, the heat generated by the ferrite reinforced layer 2 is further conducted to the graphene intermediate layer 3 through the organic silicone pressure-sensitive adhesive 6, the graphene intermediate layer 3 uniformly distributes the heat flow and transports it to the micro-channel shielding plate 4, and finally the heat is consumed by the cooling liquid inside the micro-channel shielding plate 4 to be transmitted out of the system. In addition, the graphene plating layer 7 of the embodiment can reduce the high-frequency loss of the wire 11, and the graphene intermediate layer 3 and the micro-channel shielding plate 4 can form a magnetic and electric double shielding.

[0051] The present application solves the problem of coil heat dissipation in high-power application scenarios by innovative design of materials and multi-layer composite structure, optimizes the electromagnetic shielding performance, improves the efficiency of electric energy transmission of the wireless charging device, and improves the structure and heat dissipation reliability, which has important application value in the field of wireless charging technology.

[0052] The present application also provides a wireless charging system, which includes a wireless charging transmitting device and a wireless charging receiving device, and at least one of the wireless charging transmitting device and the wireless charging receiving device adopts the wireless charging device as described above. Compared with the traditional wireless charging system, the present application can achieve more excellent heat dissipation and electromagnetic shielding effect, which is beneficial to enhance the electric energy transmission efficiency, thermal management performance, electromagnetic compatibility and safety of the wireless charging system, and is particularly suitable for high-power wireless charging systems, which has important application value and broad application prospect in the field of wireless charging technology.

[0053] As Figure 10As shown, the embodiment also provides a manufacturing method of the wireless charging device, specifically comprising the following steps:

[0054] S1, coating a graphene coating layer 7 on the surface of the oxygen-free copper material wire 11 by chemical vapor deposition;

[0055] S2, dipping the surface of the graphene coating layer 7 with insulating paint 8, and the material of the insulating paint 8 can be polyimide or polyurethane;

[0056] S3, winding the required coil body 1 according to the design parameters, and the coil body 1 is preferably wound into a planar spiral ring structure;

[0057] S4, testing the performance of the coil body 1 to meet the design requirements;

[0058] S5, processing the micro-channel shielding plate 4 by extrusion and welding process, forming a cooling channel 41 for the cooling liquid to flow in the micro-channel shielding plate 4, and forming a honeycomb-shaped groove 42 on the back surface of the micro-channel shielding plate 4;

[0059] S6, testing the structural reliability of the micro-channel shielding plate 4 to meet the design requirements;

[0060] S7, bonding the graphene intermediate layer 3 to the front surface of the micro-channel shielding plate 4 by adhesive;

[0061] S8, bonding the ferrite reinforcing layer 2 to the surface of the graphene intermediate layer 3 by organic silicone pressure-sensitive adhesive 6;

[0062] S9, fixing the wound coil body 1 to the surface of the ferrite reinforcing layer 2 by the heat-conducting gel 5, so that the heat-conducting gel 5 fills the gap between the coil body 1 and the ferrite reinforcing layer 2 and the gap between the turns of wire 11 in the coil body 1;

[0063] S10, testing the overall structure and heat dissipation reliability.

[0064] The wireless charging device manufactured in this embodiment has significant advantages in terms of heat dissipation, electromagnetic performance, and structural reliability, and the specific analysis is as follows:

[0065] In terms of heat dissipation: based on the multi-dimensional heat dissipation cooperative scheme of the graphene plating layer 7 plated on the coil body 1, the heat-conductive gel 5 filling the coil body 1, the graphene intermediate layer 3 balancing the heat flow, and the micro-channel shielding plate 4 liquid cooling, a composite heat transfer path of "coil heat source-high efficient heat conduction-planar temperature equalization-liquid cooling heat dissipation" is constructed; the graphene has a thermal conductivity not less than 5000 W / (m*K), and the graphene plating layer 7 makes the surface of the wire 11 quickly move heat; the heat-conductive gel 5 has a thermal conductivity not less than 3 W / (m*K), and has the effect of fixing the coil body 1, and at the same time, the heat-conductive gel 5 has insulation and flexibility, can fill the small gap between the coil body 1 and the ferrite reinforced layer 2, and form a low-resistance heat conduction path; the graphene intermediate layer 3 can make the heat flow received by the micro-channel shielding plate 4 more balanced, and improve the uniformity of coil heat dissipation; the electronic fluorinated liquid flowing in the micro-channel shielding plate 4 realizes high-efficiency liquid cooling. Compared with the traditional self-cooling, air-cooling and conventional water-cooling structure, the embodiment can reduce the loss of the coil system while making the heat transfer more efficient, and can meet the heat dissipation demand of the high-power wireless charging device.

[0066] In terms of electromagnetic performance: the graphene plating layer 7 can alleviate the influence of skin effect and proximity effect, and reduce the high-frequency loss of the wire 11; the ferrite reinforced layer 2 can suppress magnetic flux leakage; the graphene intermediate layer 3 and the micro-channel shielding plate 4 form "magnetic-electric" double shielding, reduce spatial electromagnetic interference, and improve electromagnetic shielding effectiveness.

[0067] In terms of structure and reliability: the wireless charging device of the embodiment is designed through multi-layer integration, has small thickness, and is suitable for compact equipment; and the flexibility of the heat-conductive gel 5, the toughness of the graphene intermediate layer 3, and the honeycomb-shaped grooves 42 on the back of the micro-channel shielding plate 4 can buffer mechanical stress, and improve the mechanical reliability and long-term working stability of the wireless charging device.

[0068] Obviously, the above embodiments of the application are only examples for clearly illustrating the application, and are not intended to limit the implementation modes of the application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the implementation modes are not required or can not be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the claims of the application.

Claims

1. A wireless charging device, characterized in that, The device comprises a coil body, a ferrite reinforcement layer, a graphene intermediate layer, and a microchannel shielding plate stacked sequentially. The coil body is fixed to the surface of the ferrite reinforcement layer by a thermally conductive gel, which fills the gap between the coil body and the ferrite reinforcement layer, as well as the gap between each turn of the conductor in the coil body. The ferrite reinforcement layer is bonded and fixed to the surface of the graphene intermediate layer. The graphene intermediate layer is bonded and fixed to the surface of the microchannel shielding plate, which has cooling channels for coolant to flow through.

2. The wireless charging device according to claim 1, characterized in that, The coil body is made of oxygen-free copper material and the wire is coated with a graphene coating. The surface of the graphene coating is impregnated with insulating varnish.

3. The wireless charging device according to claim 2, characterized in that, The graphene coating is attached to the surface of the conductor by chemical vapor deposition, and the thickness of the graphene coating is 0.05 to 0.2 micrometers; and / or, the insulating varnish is made of polyimide or polyurethane, and the thickness of the insulating varnish is 2 to 4 micrometers.

4. The wireless charging device according to claim 1, characterized in that, The thermally conductive gel fills the gaps between the wires with a thickness of not less than 50% of the wire diameter.

5. The wireless charging device according to claim 1, characterized in that, The ferrite reinforcement layer is bonded and fixed to the graphene interlayer using silicone pressure-sensitive adhesive.

6. The wireless charging device according to claim 1, characterized in that, The ferrite reinforcement layer is made of manganese-zinc ferrite or nickel-zinc ferrite, and the thickness of the ferrite reinforcement layer is not less than 500 micrometers; and / or, the thickness of the graphene interlayer is 10 to 50 micrometers.

7. The wireless charging device according to claim 1, characterized in that, The microchannel shielding plate has a honeycomb-shaped groove on the side facing away from the graphene intermediate layer.

8. The wireless charging device according to claim 7, characterized in that, The microchannel shielding plate is made of aluminum alloy; and / or, the thickness of the microchannel shielding plate is 1 to 3 mm; and / or, the porosity of the honeycomb grooves on the microchannel shielding plate is 60% to 80%.

9. A wireless charging system, comprising a wireless charging transmitter and a wireless charging receiver, characterized in that, At least one of the wireless charging transmitter and the wireless charging receiver adopts the wireless charging device as described in any one of claims 1-8.

10. A method for manufacturing a wireless charging device, characterized in that, include: A graphene coating is deposited on the surface of the conductor, and an insulating varnish is applied to the surface of the graphene coating. The coil body is then wound according to the design parameters. A microchannel shielding plate is fabricated, and a cooling channel for coolant to flow through is formed inside the microchannel shielding plate. A honeycomb-shaped groove is formed on one side of the microchannel shielding plate. A graphene interlayer is bonded to the side of the microchannel shielding plate opposite to the honeycomb groove. The ferrite reinforcement layer is bonded to the surface of the graphene intermediate layer; The wound coil body is fixed to the surface of the ferrite reinforcement layer using thermally conductive gel, so that the thermally conductive gel fills the gap between the coil body and the ferrite reinforcement layer and the gap between each turn of the wire in the coil body.

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