Wireless electric energy transmission coil with composite shielding function and wireless charging device

Abstract

The invention discloses a wireless electric energy transmission coil with a composite shielding function and a wireless charging device, the wireless electric energy transmission coil comprises a first coupling coil, a first composite shielding layer, a second coupling coil and a second composite shielding layer, the first coupling coil and the second coupling coil respectively comprise a plurality of coils, the plurality of coils are wound in a plane to form a coupling area and a hollow area, the hollow area is located in the middle of the coupling area, and the coupling coils can be symmetrically placed to form a coupling space; each of the first composite shielding layer and the second composite shielding layer comprises a first shielding layer and a second shielding layer, and the first shielding layer is located between the second shielding layer and the coupling coil; the hollow area, corresponding to the first coupling coil, of the first shielding layer is provided with a first through hole structure penetrating through the first shielding layer; the first coupling coil and the second coupling coil are arranged at an interval and can be wirelessly connected through magnetic coupling resonance. The technical scheme of the invention has the advantages of light weight, good transmission performance and shielding performance, and strong anti-offset capability.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless charging, and in particular to a wireless power transmission coil and a wireless charging device with a composite shielding function. Background Art

[0002] In wireless charging, wireless power transmission relies on the mutual inductance connection between the transmitting coil and the receiving coil. The transmitting coil transmits electromagnetic energy, and the receiving coil receives electromagnetic energy, so that the transmitting end can wirelessly charge the receiving device. Most of the existing transmitting coils and receiving coils have leakage magnetic problems, which not only cause serious energy loss, but also bring additional electromagnetic radiation. In order to solve the problem of electromagnetic radiation, in the related technology, an external shielding layer is added to the outside of the transmitting coil and the receiving coil, but the structure of the external shielding layer is large, resulting in a large size and weight of the entire structure, high production cost, and leakage magnetic phenomenon still exists. In addition, most coil structures are single-layer coils with poor anti-offset ability. When there is a slight offset, the mutual inductance connection will be greatly reduced, and its coupling coefficient will drop rapidly with position and angle offset, resulting in a decrease in transmission efficiency.

[0003] In view of this, it is necessary to further improve the current wireless power transmission coil structure. Summary of the invention

[0004] In order to solve at least one of the above technical problems, the main purpose of the present invention is to provide a wireless power transmission coil and a wireless charging device with a composite shielding function.

[0005] To achieve the above object, a technical solution adopted by the present invention is to provide a wireless power transmission coil with a composite shielding function, comprising:

[0006] A first coupling coil and a second coupling coil, wherein the first coupling coil and the second coupling coil each include a plurality of coils, the plurality of coils are wound in a plane to form a coupling area and a hollow area, the hollow area is located in the middle of the coupling area, and the second coupling coil can be symmetrically placed with the first coupling coil to form a coupling space;

[0007] A first composite shielding layer and a second composite shielding layer, wherein the second composite shielding layer may be symmetrical with the first composite shielding layer, and both the first composite shielding layer and the second composite shielding layer include a first shielding layer and a second shielding layer; the first shielding layer is installed on a side adjacent to the first coupling coil or the second coupling coil, the second shielding layer is adjacent to the first shielding layer, and the second shielding layer is far away from the first coupling coil or the second coupling coil; a first through-hole structure penetrating the first shielding layer is provided in a hollow area of ​​the first coupling coil corresponding to the first coupling coil;

[0008] The first coupling coil and the second coupling coil are spaced apart and can be wirelessly connected via magnetic coupling resonance in the coupling space.

[0009] Among them, the first through-hole structure includes a plurality of first through-holes and a plurality of second through-holes penetrating the first shielding layer, the plurality of first through-holes are evenly distributed, and each second through-hole is located between adjacent first through-holes, wherein the aperture of the first through-hole is larger than the aperture of the second through-hole.

[0010] Wherein, the shape of the first through hole is circular or rectangular; and / or

[0011] The second through hole is in a circular or rectangular shape.

[0012] The outer sides of the first coupling coil and the second coupling coil are both circular, and the inner sides are both square.

[0013] Wherein, the second shielding layer is in sheet shape, and the diameter of the second shielding layer is greater than the diagonal length of the square and smaller than the diameter of the circle; or

[0014] A notch is provided on one side of the second shielding layer close to the first shielding layer, the notch is arranged in a square shape, a via hole or an arc-shaped groove penetrating the periphery of the notch is provided, and the aperture of the via hole or the arc-shaped groove is smaller than the thickness of the second shielding layer; or

[0015] The second shielding layer is provided with a second through-hole structure, and the second through-hole structure is symmetrically arranged with the first through-hole structure.

[0016] Wherein, the first through hole and the second through hole are both circular holes, the aperture of the first through hole is 1 / 5-1 / 4 of the side length of the inner square, and the aperture of the second through hole is 1 / 10-1 / 8 of the side length of the inner square; or

[0017] The first through hole and the second through hole are both square holes, the side length of the first through hole is 1 / 5-1 / 4 of the side length of the inner square, and the side length of the second through hole is 1 / 10-1 / 8 of the side length of the inner square.

[0018] The material of the first shielding layer is ferrite, and the material of the second shielding layer is aluminum or aluminum alloy.

[0019] To achieve the above-mentioned purpose, another technical solution adopted by the present invention is: to provide a wireless charging device, including a power end component, a coupling coil and a load end component, the power end component and the load end component are wirelessly connected through the coupling coil, and the coupling coil is the above-mentioned wireless power transmission coil with a composite shielding function.

[0020] The coupling coil comprises a first coupling coil and a second coupling coil.

[0021] The power supply end assembly includes a first shell, and a power supply and a high-frequency inverter circuit installed in the first shell, the power supply is electrically connected to the high-frequency inverter circuit, and the first coupling coil is installed in the first shell and electrically connected to the high-frequency inverter circuit;

[0022] The load-end component includes a second shell, a rectifier circuit installed in the second shell, and a load circuit installed in the second shell, the second coupling coil is electrically connected to the rectifier circuit, and the rectifier circuit is connected to the load circuit.

[0023] Wherein, a first opening is provided on a side of the first shell close to the first coupling coil, and a second opening is provided on a side of the second shell close to the second coupling coil, and the first opening can be placed symmetrically with the second opening;

[0024] The first shell and the second shell are made of silicon steel or monel alloy.

[0025] The technical solution of the present invention can shield the leakage magnetic field when the coupling coil is coupled through the first composite shielding layer and the second composite shielding layer, thereby improving the transmission efficiency of electric energy transmission. The first composite shielding layer and the second composite shielding layer both include a first shielding layer and a second shielding layer, wherein the first shielding layer can suppress the magnetic field in the blank areas of the primary side and the secondary side and enhance the mutual inductance between the coupling coils, and the first shielding layer is provided with a first through-hole structure, which is conducive to reducing the material and weight of the first shielding layer and reducing production costs; the second shielding layer can further enhance the magnetic shielding effect and reduce the eddy current loss that may be caused when the magnetic flux in the blank area enters the circuits on the primary and secondary sides and nearby components. In summary, the structure of this embodiment has the effects of light weight, good transmission performance and shielding performance, and strong anti-offset ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of an embodiment of a wireless power transmission coil with a composite shielding function of the present invention;

[0028] Figure 2 It is a schematic structural diagram of another embodiment of the wireless power transmission coil with composite shielding function of the present invention;

[0029] Figure 3It is a structural schematic diagram of another embodiment of the wireless power transmission coil with composite shielding function of the present invention;

[0030] Figure 4 It is a structural schematic diagram of another embodiment of the wireless power transmission coil with composite shielding function of the present invention;

[0031] Figure 5 FIG. 4 is a schematic structural diagram of a wireless charging device according to an embodiment of the present invention. Description of the drawings:

[0033] 100, power supply end assembly: 110, first housing; 111, first opening; 112, oil hole; 120, power supply; 130, high frequency inverter circuit;

[0034] 200, load end assembly; 210, second housing; 211, second opening; 220, rectifier circuit; 230, load circuit;

[0035] 300. Coupling coil:

[0036] 310, first coupling coil; 311, coupling region; 312, hollow region;

[0037] 320, first composite shielding layer; 321, first shielding layer; 3211, first through-hole structure; 3212, second through-hole; 3213, first through-hole; 322, second shielding layer; 3221, second through-hole structure;

[0038] 330, a second coupling coil;

[0039] 340, second composite shielding layer; 3411, notch; 3412, arc-shaped groove.

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] Different from the related art in which the structure of the outer shielding layer of the wireless transmission coil is relatively large, resulting in the large size and weight of the entire structure, high production cost, and the problem of magnetic leakage, the present invention provides a wireless power transmission coil with a composite shielding function, which can effectively suppress electromagnetic radiation through the composite shielding layer without affecting the mutual inductance coupling of the coil. Please refer to the following embodiment for the specific structure of the wireless power transmission coil with a composite shielding function.

[0044] Please refer to Figures 1 to 4 , Figure 1 It is a structural schematic diagram of an embodiment of a wireless power transmission coil with a composite shielding function of the present invention; Figure 2 It is a schematic structural diagram of another embodiment of the wireless power transmission coil with composite shielding function of the present invention; Figure 3 It is a structural schematic diagram of another embodiment of the wireless power transmission coil with composite shielding function of the present invention; Figure 4 The structure diagram of another embodiment of the wireless power transmission coil with composite shielding function of the present invention is shown in FIG. In the embodiment of the present invention, the wireless power transmission coil with composite shielding function includes: a first coupling coil 310 , a second coupling coil 330 , a first composite shielding layer 320 and a second composite shielding layer 340 .

[0045] A first coupling coil 310 and a second coupling coil 330, wherein the first coupling coil 310 and the second coupling coil 330 each include a plurality of coils, wherein the plurality of coils are wound in a plane to form a coupling region 311 and a hollow region 312, wherein the hollow region 312 is located in the middle of the coupling region 311, and the second coupling coil 330 can be symmetrically placed with the first coupling coil 310 to form a coupling space;

[0046] A first composite shielding layer 320 and a second composite shielding layer 340, wherein the second composite shielding layer 340 may be symmetrical with the first composite shielding layer 320, and both the first composite shielding layer 320 and the second composite shielding layer 340 include a first shielding layer 321 and a second shielding layer 322; the first shielding layer 321 is installed on a side adjacent to the first coupling coil 310 or the second coupling coil 330, the second shielding layer 322 is adjacent to the first shielding layer 321, and the second shielding layer 322 is away from the first coupling coil 310 or the second coupling coil 330; the first shielding layer 321 is provided with a first through-hole structure 3211 penetrating the first shielding layer 321 in a hollow area 312 corresponding to the first coupling coil 310;

[0047] The first coupling coil 310 and the second coupling coil 330 are spaced apart and can be wirelessly connected via magnetic coupling resonance in the coupling space.

[0048] Specifically, the first coupling coil 310 can be used as a transmitting coil, and the second coupling coil 330 can be used as a receiving coil. The first coupling coil 310 is formed by winding a plurality of turns of copper wire, copper wire alloy or Litz wire with good conductivity. The first coupling coil 310 after winding is in a planar shape, which is conducive to increasing the electromagnetic energy emission area, improving the energy emission efficiency, and also has good anti-deviation performance; the second coupling coil 330 is also formed by winding a plurality of turns of copper wire, copper wire alloy or Litz wire with good conductivity. The second coupling coil 330 after winding is in a planar shape, which is conducive to increasing the electromagnetic energy receiving area, improving the energy receiving efficiency, and also has good anti-deviation performance, so that the power transmission efficiency of the entire device can be improved. The plane formed by winding the first coupling coil 310 is a coupling area 311, that is, a working area, which is used to transmit electromagnetic energy. The middle of the first coupling coil 310 is surrounded by a hollow area 312, and there is no coil in the hollow area 312. The hollow area 312 is a non-working area. The non-working area will leak magnetic flux, and the leakage magnetic problem can be shielded by the first composite shielding layer 320. The first composite shielding layer 320 includes a first shielding layer 321 and a second shielding layer 322. The first shielding layer 321 is non-conductive and can be in direct contact with the first coupling coil 310. The first shielding layer 321 can suppress the magnetic field in the non-working area of ​​the primary side (power supply end component) and the secondary side (load end component). The material of the first shielding layer 321 is a non-metallic material with high magnetic permeability. In this embodiment, ferrite is preferably used, which can enhance the mutual inductance of the coupling structure and improve the power transmission efficiency of the device. The diameter of the ferrite is equal to the outer diameter of the first coupling coil 310. In addition, the first shielding layer 321 has a first through-hole structure 3211 corresponding to the hollow area 312 of the first coupling coil 310. Without affecting the shielding performance, the material of the first shielding layer 321 can be saved, and the weight and cost can be reduced. The second shielding layer 322 can further enhance the magnetic shielding effect and reduce the eddy current loss that may be caused when the magnetic flux in the non-working area enters the circuits of the primary and secondary sides and nearby components. The material of the second shielding layer 322 is aluminum or aluminum alloy, which has a good electromagnetic shielding effect. The plane formed by the winding of the second coupling coil 330 is the coupling area 311, that is, the working area, which is used to emit electromagnetic energy. The middle of the second coupling coil 330 is surrounded by a hollow area 312, and the hollow area 312 is a non-working area. The non-working area will leak magnetic flux, and the leakage magnetic problem can be shielded by the second composite shielding layer 340. The second composite shielding layer 340 includes a first shielding layer 321 and a second shielding layer 322. The first shielding layer 321 is non-conductive and can be in direct contact with the second coupling coil 330. The first shielding layer 321 can suppress the magnetic field in the non-working area of ​​the primary side and the secondary side. The material of the first shielding layer 321 is a non-metallic material with high magnetic permeability. In this embodiment, ferrite is preferably used, which can enhance the mutual inductance of the coupling structure and improve the power transmission efficiency of the device. The diameter of the ferrite is equal to the outer diameter of the second coupling coil 330.In addition, the first shielding layer 321 has a first through-hole structure 3211 corresponding to the hollow area 312 of the second coupling coil 330, which can save the material of the first shielding layer 321 without affecting the shielding performance, and reduce weight and cost. The second shielding layer 322 can further enhance the magnetic shielding effect and reduce the eddy current loss that may be caused when the magnetic flux in the non-working area enters the primary and secondary side circuits and nearby components. The material of the second shielding layer 322 is aluminum or aluminum alloy, which has a good electromagnetic shielding effect. It can be understood that the first coupling coil 310 and the second coupling coil 330 are symmetrically arranged.

[0049] In some embodiments, the first through-hole structure 3211 includes a plurality of first through-holes 3213 and a plurality of second through-holes 3212 penetrating the first shielding layer 321, the plurality of first through-holes 3213 are evenly distributed, each second through-hole 3212 is located between adjacent first through-holes 3213, wherein the aperture of the first through-hole 3213 is larger than the aperture of the second through-hole 3212. The plurality of first through-holes 3213 and the second through-hole 3212 correspond to the hollow area 312 of the coupling coil, otherwise a large amount of magnetic flux leakage will occur, affecting the shielding effect. The aperture of the first through-hole 3213 can be set according to actual needs, and is not limited here. The aperture of the second through-hole 3212 can also be set according to actual needs, and is not limited here. The aperture of the first through-hole 3213 is larger than the aperture of the second through-hole 3212. By setting two or more groups of through-holes with different apertures, ferrite materials can be further saved and the weight of the structure can be reduced. Considering the processing technology, it is appropriate to have two or more through holes, taking into account both saving materials and facilitating processing. In a parallel solution, the first through hole 3213 structure 3221 can also be set as a group of through holes, and the through holes in the group are evenly distributed, and the number of through holes in the group can be set according to the actual size, which is not limited here.

[0050] Further, the shape of the first through hole 3213 is circular or rectangular. In a parallel scheme, the shape of the second through hole 3212 is circular or rectangular. When the first through hole 3213 is circular, the second through hole 3212 is preferably designed to be circular, and the first through hole 3213 and the second through hole 3212 are both circular holes, which are more convenient to process. Of course, the second through hole 3212 can also be holes of other shapes, such as rectangles, diamonds or special shapes. Since it is necessary to process through holes of different shapes, processing is inconvenient. When the second through hole 3212 is square, the second through hole 3212 is preferably designed to be square, and the first through hole 3213 and the second through hole 3212 are both square holes, which are more convenient to process. Of course, the second through hole 3212 can also be holes of other shapes, such as circles, diamonds or special shapes.

[0051] In some embodiments, the outer sides of the first coupling coil 310 and the second coupling coil 330 are both circular, and the inner sides are both square. In some parallel schemes, the outer and inner sides of the first coupling coil 310 and the second coupling coil 330 are both circular; or the outer and inner sides of the first coupling coil 310 and the second coupling coil 330 are both elliptical; or the outer and inner sides of the first coupling coil 310 and the second coupling coil 330 are both square. By comparing the transmission performance after simulating the above four coupling coil structures, the outer circle and inner square coil structure is preferred, that is, the outer side of the coupling coil is circular, and the inner side is square, and the mutual inductance is better. In some embodiments, the second shielding layer 322 is set in a sheet shape, and the diameter of the second shielding layer 322 is greater than the diagonal length of the square and less than the diameter of the circle. At this time, the coverage of the second shielding layer 322 accounts for about 50% of the outer diameter circle area of ​​the coupling coil. In a parallel scheme, a notch 3411 is provided on one side of the second shielding layer 322 close to the first shielding layer 321, and the notch 3411 corresponds to a square setting. The periphery of the notch 3411 is provided with a through hole or arc groove 3412 that penetrates the periphery, and the aperture of the through hole or arc groove 3412 is smaller than the thickness of the second shielding layer 322. This embodiment is suitable for downhole environment and can pass oil-water mixture. The area of ​​the notch 3411 is the same as the area of ​​the hollow area 312 of the coupling coil, and the number of the through hole or arc groove 3412 can be flexibly set according to the first through hole structure 3211. For example, in this embodiment, there are 8 first through holes 3213 in the periphery of the ferrite square area, so the number of through holes inside the aluminum plate is also 8. In a parallel scheme, the second shielding layer 322 is provided with a second through hole structure 3221, and the second through hole structure 3221 is symmetrically arranged with the first through hole structure 3211. The size, position and distribution of the through holes in the second through hole structure 3221 are the same as those of the first through hole structure 3211 .

[0052] Please refer to Figure 3In some embodiments, both the first through hole 3213 and the second through hole 3212 are circular holes, the aperture of the first through hole 3213 is 1 / 5-1 / 4 of the side length of the inner square, and the aperture of the second through hole 3212 is 1 / 10-1 / 8 of the side length of the inner square. In the specific arrangement, the 9 first through holes 3213 are arranged at equal intervals in the square area, and the remaining 4 first through holes 3213 are arranged symmetrically around the first through hole 3213 located in the center, and the remaining second through holes 3212 are inserted in the gaps of the first through holes 3213, specifically, in the upper, lower, left or right direction of the first through hole 3213. In a parallel scheme, both the first through hole 3213 and the second through hole 3212 are square holes, the side length of the first through hole 3213 is 1 / 5-1 / 4 of the side length of the inner square, and the side length of the second through hole 3212 is 1 / 10-1 / 8 of the side length of the inner square. The arrangement is the same as that of the first through hole 3213 and the second through hole 3212 which are both round holes. Figure 4 In one embodiment, the first through hole structure 3211 may be a plurality of first through holes 3213. The specific arrangement is: 9 equal-sized square first through holes 3213 are evenly arranged in the inner square area.

[0053] In summary, the solution of the present invention has at least the following effects:

[0054] 1. The inner square and outer circular coupling coil has better mutual inductance, and according to the simulation results, the coupling mutual inductance is greatly improved, and the transmission efficiency is higher;

[0055] 2. Ferrite has a good gain in mutual inductance and shielding performance of wireless power transmission. The ferrite structure is optimized without sacrificing the transmission performance and shielding performance of the system;

[0056] 3. Through structural optimization, 23.3% of ferrite can be saved on one side of the coupling coil, reducing the cost and weight of the coupling structure;

[0057] 4. Through structural optimization, the mutual inductance is basically unchanged and the transmission performance is basically unaffected. The magnetic field shielding performance of the optimized structure is very good, which is basically the same as the structural shielding effect of the whole ferrite, which is conducive to miniaturization design;

[0058] 5. The use of aluminum plate-ferrite composite shielding structure can further improve the electromagnetic shielding effect. The structure has strong anti-deviation ability, and has good transmission performance and shielding performance.

[0059] Please refer to Figure 5 , Figure 5It is a schematic diagram of the structure of an embodiment of the wireless charging device of the present invention. In the embodiment of the present invention, the wireless charging device includes a power supply end component 100, a coupling coil 300 and a load end component 200. The power supply end component 100 and the load end component 200 are wirelessly connected through the coupling coil 300. The coupling coil 300 is a wireless power transmission coil with a composite shielding function as described above. Please refer to the above embodiment for the specific structure of the wireless power transmission coil, which will not be repeated here. Since the wireless charging device of this scheme adopts all the technical solutions of all the embodiments of the wireless power transmission coil described above, it has at least all the advantages and beneficial effects brought by the technical solutions of the wireless power transmission coil of the above embodiment, which will not be repeated here one by one.

[0060] Specifically, the coupling coil 300 has a first coupling coil 310 and a second coupling coil 330. The power supply end component 100 includes a first housing 110, and a power supply 120 and a high-frequency inverter circuit 130 installed in the first housing 110. The power supply 120 is electrically connected to the high-frequency inverter circuit 130. The first coupling coil 310 is installed in the first housing 110 and is electrically connected to the high-frequency inverter circuit 130. The load end component 200 includes a second housing 210, a rectifier circuit 220 installed in the second housing 210, and a load circuit 230 installed in the second housing 210. The second coupling coil 330 is electrically connected to the rectifier circuit 220, and the rectifier circuit 220 is connected to the load circuit 230. The first coupling coil 310 is a transmitting coil, and the second coupling coil 330 is a receiving coil. The power supply 120 is a DC power supply that provides DC power. The high-frequency inverter circuit 130 can oscillate the DC power and send electromagnetic energy outward through the transmitting coil (first coupling coil). When the receiving coil (second coupling coil) is close to the transmitting coil, it can receive electromagnetic energy through magnetic coupling resonance, and the electromagnetic energy can power the rechargeable battery connected to the load circuit 230 through rectification and filtering. In this embodiment, the load circuit 230 can be built into a smart phone, pad and other products, and it can deliver power to the built-in rechargeable battery in the smart phone, pad and other products. In actual applications, the load end component 200 and the receiving coil are built into the smart terminal. The power end component 100 and the transmitting coil are built into the wireless charging stand.

[0061] Specifically, a first opening 111 is provided on a side of the first shell 110 close to the first coupling coil 310, and a second opening 211 is provided on a side of the second shell 210 close to the second coupling coil 330. The first opening 111 can be placed symmetrically with the second opening 211. The materials of the first shell 110 and the second shell 210 are both magnetic conductive metals or alloys.

[0062] The first opening 111 and the second opening 211 are symmetrically arranged, and the size of the first opening 111 is larger than the maximum outer diameter of the first coupling coil 310, and the size of the second opening 211 is larger than the maximum outer diameter of the second coupling coil 330, so as to improve the transmission efficiency. In practical applications, the first opening 111 and the second opening 211 can be covered with a shell to shield the coupling coil 300 inside. The shell can be integrally formed with the first shell 110 or the second shell 210.

[0063] The material of the first shell 110 is a magnetic metal or alloy, which has good magnetic conductivity, which is conducive to realizing a weak closed magnetic circuit, thereby realizing wireless transmission of electric energy. The magnetic metal can be iron, nickel, cobalt or its alloy, etc. In this solution, the material of the first shell 110 is preferably silicon steel or monel alloy (Monel 400). The material of the second shell 210 is a magnetic metal or alloy, which has good magnetic conductivity, which is conducive to realizing a weak closed magnetic circuit, thereby realizing wireless transmission of electric energy. The magnetic metal can be iron, nickel, cobalt or its alloy, etc. In this solution, the material of the second shell 210 is also preferably silicon steel or monel alloy (Monel 400). The first shell 110 and the second shell 210 can be provided with square or circular oil holes 112. The number, size and position of the oil holes 112 can be designed according to actual requirements, and are not limited here.

[0064] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical solution of the present invention; or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A wireless power transmission coil with composite shielding function, characterized in that: The wireless power transmission coil assembly comprises: A first coupling coil and a second coupling coil, wherein the first coupling coil and the second coupling coil each include a plurality of coils, the plurality of coils are wound in a plane to form a coupling area and a hollow area, the hollow area is located in the middle of the coupling area, and the second coupling coil can be symmetrically placed with the first coupling coil to form a coupling space; A first composite shielding layer and a second composite shielding layer, wherein the second composite shielding layer may be symmetrical with the first composite shielding layer, and both the first composite shielding layer and the second composite shielding layer include a first shielding layer and a second shielding layer; the first shielding layer is installed on a side adjacent to the first coupling coil or the second coupling coil, the second shielding layer is adjacent to the first shielding layer, and the second shielding layer is far away from the first coupling coil or the second coupling coil; a first through-hole structure penetrating the first shielding layer is provided in a hollow area of ​​the first coupling coil corresponding to the first coupling coil; The first coupling coil and the second coupling coil are spaced apart and can be wirelessly connected via magnetic coupling resonance in the coupling space.

2. The wireless power transmission coil with composite shielding function as claimed in claim 1, characterized in that: The first through-hole structure includes a plurality of first through-holes and a plurality of second through-holes penetrating the first shielding layer, wherein the plurality of first through-holes are evenly distributed, and each second through-hole is located between adjacent first through-holes, wherein the aperture of the first through-hole is larger than the aperture of the second through-hole.

3. The wireless power transmission coil with composite shielding function as claimed in claim 2, characterized in that: The shape of the first through hole is circular or rectangular; and / or The second through hole is in a circular or rectangular shape.

4. The wireless power transmission coil with composite shielding function as claimed in claim 1, characterized in that: The outer sides of the first coupling coil and the second coupling coil are both circular, and the inner sides are both square.

5. The wireless power transmission coil with composite shielding function as claimed in claim 4, characterized in that: The second shielding layer is in sheet shape, and the diameter of the second shielding layer is greater than the diagonal length of the square and smaller than the diameter of the circle; or A notch is provided on one side of the second shielding layer close to the first shielding layer, the notch is arranged in a square shape, a via hole or an arc-shaped groove penetrating the periphery of the notch is provided, and the aperture of the via hole or the arc-shaped groove is smaller than the thickness of the second shielding layer; or The second shielding layer is provided with a second through-hole structure, and the second through-hole structure is symmetrically arranged with the first through-hole structure.

6. The wireless power transmission coil with composite shielding function as claimed in claim 3, characterized in that: The first through hole and the second through hole are both circular holes, the diameter of the first through hole is 1 / 5-1 / 4 of the side length of the inner square, and the diameter of the second through hole is 1 / 10-1 / 8 of the side length of the inner square; or The first through hole and the second through hole are both square holes, the side length of the first through hole is 1 / 5-1 / 4 of the side length of the inner square, and the side length of the second through hole is 1 / 10-1 / 8 of the side length of the inner square.

7. The wireless power transmission coil with composite shielding function as claimed in claim 1, characterized in that: The material of the first shielding layer is ferrite, and the material of the second shielding layer is aluminum or aluminum alloy.

8. A wireless charging device, characterized in that: The wireless charging device includes a power end component, a coupling coil and a load end component. The power end component and the load end component are wirelessly connected via the coupling coil. The coupling coil is a wireless power transmission coil with a composite shielding function as described in any one of claims 1 to 7.

9. The wireless charging device according to claim 8, characterized in that: The coupling coil comprises a first coupling coil and a second coupling coil. The power supply end assembly includes a first shell, and a power supply and a high-frequency inverter circuit installed in the first shell, the power supply is electrically connected to the high-frequency inverter circuit, and the first coupling coil is installed in the first shell and electrically connected to the high-frequency inverter circuit; The load-end component includes a second shell, a rectifier circuit installed in the second shell, and a load circuit installed in the second shell, the second coupling coil is electrically connected to the rectifier circuit, and the rectifier circuit is connected to the load circuit.

10. The wireless charging device according to claim 9, characterized in that: A first opening is provided on a side of the first shell close to the first coupling coil, and a second opening is provided on a side of the second shell close to the second coupling coil, and the first opening can be symmetrically placed with the second opening; The first shell and the second shell are made of silicon steel or monel alloy.

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