Wireless charging shield and manufacturing method thereof, wireless charger

Abstract

The present application relates to the field of wireless power supply technology, and in particular to a wireless charging shield and a manufacturing method thereof, and a wireless charger. The wireless charging shield includes a first shield and a second shield, wherein the second shield is arranged at the periphery of the first shield, and the first shield and the second shield form a cavity for accommodating a coil; the first shield and the second shield are both formed by laminating at least one layer of soft magnetic material. The wireless charging shield provided by the present application improves the electromagnetic shielding capability of the wireless charging shield for the coil by arranging the second shield at the periphery of the first shield.

Description

Technical Field

[0001] The present application relates to the technical field of wireless charging shielding bodies and manufacturing methods thereof, and in particular to a wireless charging shielding body and a manufacturing method thereof, and a wireless charger. Background Art

[0002] The power supply technology of electronic devices is generally divided into wired connection power supply method and wireless connection power supply method. Taking the power supply of mobile phones as an example, its power supply (i.e. charging) is usually achieved by connecting an external power supply to the mobile phone through a power cord. The mobile phone wireless charging that has received widespread attention in recent years is a wireless connection power supply method. It does not set a physical connection between the power supply and the mobile phone, but realizes power supply through the conversion of electromagnetic field energy.

[0003] Wireless power supply generally adopts electromagnetic induction, and its system is basically composed of a transmitting coil module and circuit, and a receiving coil module and circuit. The transmitting and receiving modules generally contain a planar spiral coil, whose function is to convert electrical energy into magnetic energy or convert magnetic energy into electrical energy. When the converted energy is directly transmitted through the coil, since the transmission medium is air, its magnetic permeability is low and the magnetic energy transmission efficiency is low. At the same time, the leaked magnetic flux generates eddy currents in the external metal medium, causing safety risks. To solve the above problems, soft magnetic materials are generally used to make wireless charging shields (i.e., magnetic isolation sheets), which are attached to the planar coils. Because soft magnetic materials have higher magnetic permeability than air, they can constrain and shield the magnetic field and improve the efficiency of magnetic energy transmission.

[0004] With the increasing popularity of wireless charging technology, the power of wireless charging for mobile devices has continued to increase, and has now reached 30W. According to the conversion efficiency of wireless charging, the input power of the wireless charging transmitter will exceed 40W. The higher power makes the transmitter and receiver generate huge heat during charging, and the transmitter is very close to the mobile device. Generally, the battery and power supply circuit of the mobile device are behind the receiving coil. This makes the system not only generate a lot of heat, but also difficult to dissipate heat. In order to solve this problem, air-cooling fans are generally added to the transmitter for heat dissipation, but this is bound to increase the size and cost of the transmitter, and if the system power continues to increase, this solution also has limitations.

[0005] In practice, the heating of the system comes from the copper loss caused by the coil impedance, the magnetic loss caused by the shielding magnet, and the dissipation of the leakage flux. At present, the charging efficiency of the wireless charging system is only about 85% at most, while the conversion efficiency of a similar power transformer system can reach 95% or even higher. The main difference between the two is that the coupling coefficients of the two systems are quite different. The coupling coefficient of the power transformer can be close to 1, while the coupling coefficient of the general wireless charging system is between 0.2-0.8. The low coupling coefficient increases the input power, increases the copper loss, and increases the heating of the circuit, which greatly reduces the system conversion efficiency and hinders the development of high-power miniaturized wireless charging transmitter equipment.

[0006] Therefore, there is an urgent need for a wireless charging shield and a manufacturing method thereof, and a wireless charger to solve the above problems. Summary of the invention

[0007] The present application provides a wireless charging shield and a manufacturing method thereof, and a wireless charger, so as to improve the shielding capability of the wireless charging shield.

[0008] In a first aspect, an embodiment of the present application provides a wireless charging shield, comprising:

[0009] a first shielding body;

[0010] A second shielding body, wherein the second shielding body is arranged on the outer periphery of the first shielding body, and the first shielding body and the second shielding body form a cavity for accommodating the coil;

[0011] The first shielding body and the second shielding body are both formed by laminating at least one layer of soft magnetic material.

[0012] In a possible design, the second shielding body and the first shielding body are integrally formed.

[0013] In a possible design, the second shielding body includes a plurality of outer shielding parts and a notch for leading out the coil, and there is a gap between two adjacent outer shielding parts.

[0014] In a possible design, the second shielding body and the first shielding body are assembled and formed separately.

[0015] In a possible design, the second shielding body is fixed to a first side surface of the first shielding body along a horizontal direction or to a second side surface of the first shielding body along a vertical direction.

[0016] In a possible design, a third shielding body is further included, the first shielding body is provided with an inner hole, and the third shielding body is arranged around the inner hole.

[0017] In a possible design, the third shielding body and the first shielding body are integrally formed or assembled separately.

[0018] In a possible design, a stacking direction of the first shielding body is perpendicular to a stacking direction of the second shielding body.

[0019] In a possible design, the soft magnetic material includes amorphous and / or nanocrystalline material.

[0020] In a second aspect, an embodiment of the present application provides a method for manufacturing a wireless charging shield, comprising:

[0021] Prepare a first shielding body, and prepare a second shielding body on the periphery of the first shielding body;

[0022] The first shielding body and the second shielding body form a cavity for accommodating the coil, and the first shielding body and the second shielding body are both formed by laminating at least one layer of soft magnetic material.

[0023] In a possible design, the second shielding body and the first shielding body are integrally formed.

[0024] In a possible design, preparing a first shielding body and preparing a second shielding body on the periphery of the first shielding body includes:

[0025] At least one layer of soft magnetic material is stacked to form a first-state shielding body;

[0026] The first-state shielding body is die-cut by a first mold, and an insulating film is attached to two surfaces of the first-state shielding body die-cut by the first mold in a vertical direction to obtain a second-state shielding body;

[0027] The second-state shielding body is die-cut by a second die, so that a plurality of gaps and indentations are generated in the second-state shielding body, thereby obtaining a third-state shielding body;

[0028] The third state shielding body is die-cut by a third die, and the third state shielding body forms the first shielding body on a side of the indentation away from the gap, and the third state shielding body is vertically bent on a side of the indentation close to the gap to form the second shielding body.

[0029] In a possible design, the die-cutting area of ​​the second die is larger than the die-cutting area of ​​the first die.

[0030] In a possible design, the second shielding body and the first shielding body are assembled and formed separately.

[0031] In a possible design, the first shielding body is provided with an inner hole, and the manufacturing method further includes: preparing a third shielding body around the inner hole.

[0032] In a possible design, a stacking direction of the first shielding body is perpendicular to a stacking direction of the second shielding body.

[0033] In a third aspect, an embodiment of the present application provides a wireless charger, comprising the wireless charging shield body as described above, or comprising a shield body manufactured by the manufacturing method of the wireless charging shield body described above.

[0034] It can be seen that the wireless charging shielding body provided in the present application improves the electromagnetic shielding capability of the wireless charging shielding body for the coil by disposing the second shielding body on the periphery of the first shielding body. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the structure of a wireless charging shield provided in an embodiment of the present application;

[0036] Figure 2 A cross-sectional schematic diagram of a first shielding body provided in an embodiment of the present application;

[0037] Figure 3 A cross-sectional schematic diagram of the cooperation between a wireless charging shield and a coil provided in one embodiment of the present application;

[0038] Figure 4 A cross-sectional schematic diagram of the cooperation between a wireless charging shield and a coil provided in yet another embodiment of the present application;

[0039] Figure 5 A cross-sectional schematic diagram of the cooperation between a wireless charging shield and a coil provided in yet another embodiment of the present application;

[0040] Figure 6 A cross-sectional schematic diagram of the cooperation between a wireless charging shield and a coil provided in yet another embodiment of the present application;

[0041] Figure 7 A cross-sectional schematic diagram of the cooperation between a wireless charging shield and a coil provided in yet another embodiment of the present application;

[0042] Figure 8 A top view of a first mold provided in an embodiment of the present application;

[0043] Fig. 9 A top view of the second mold provided in the embodiment of the present application

[0044] Fig.10 A top view of the third mold provided in the embodiment of the present application

[0045] Fig.11 A schematic diagram of the positional relationship between the first mold, the second mold, and the third mold provided in an embodiment of the present application;

[0046] Fig.12 A planar expansion diagram of the wireless charging shield provided in an embodiment of the present application or a planar schematic diagram of the third-state shield provided in an embodiment of the present application after being die-cut by a third mold;

[0047] Fig.13 A schematic diagram of the structure of a first fixture provided in an embodiment of the present application;

[0048] Fig.14 A schematic diagram of the structure of the first fixture provided in an embodiment of the present application when it cooperates with a wireless charging shield;

[0049] Fig.15 A schematic diagram of the structure of a second fixture provided in an embodiment of the present application;

[0050] Fig.16 This is a schematic diagram of the structure of the second mold provided in an embodiment of the present application when it cooperates with the wireless charging shielding body.

[0051] Reference numerals:

[0052] X-horizontal direction;

[0053] Y-vertical direction;

[0054] 10- cavity;

[0055] 20-coil;

[0056] 1- first shielding body;

[0057] 11-Inner hole;

[0058] 12-Soft magnetic materials;

[0059] 13-Double-sided tape;

[0060] 14-single-sided adhesive tape;

[0061] 2- second shielding body;

[0062] 21- outer shielding part;

[0063] 22-Gap;

[0064] 23- Gap;

[0065] 3- the third shielding body;

[0066] 31- inner shielding part;

[0067] 4- first mold;

[0068] 41- first circumscribed circle;

[0069] 42-first inscribed circle;

[0070] 5- second mold;

[0071] 51- second circumscribed circle;

[0072] 52- second inscribed circle;

[0073] 53-exo-strip;

[0074] 54-internal strip;

[0075] 6- the third mold;

[0076] 61-third circumscribed circle;

[0077] 62-third inscribed circle;

[0078] 8-The first fixture;

[0079] 81- first convex surface;

[0080] 9-Second fixture;

[0081] 91- second convex surface;

[0082] 92-Through hole.

[0083] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0084] The present application is described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0085] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0086] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0087] The wireless charging shields used in the current wireless charging transmitter module are all made of soft magnetic materials (such as soft magnetic ferrite materials). Due to the large area of ​​the mobile phone, in order to achieve the needs of greater power, charging range and thin thickness, the specifications of the wireless charging shield of the wireless charging transmitter single coil module are generally 50mm*50mm*1mm. Due to the large area and thin thickness, it is easy to cause problems such as product deformation and breakage, which makes the production of the wireless charging shield difficult. In order to solve the problem of production difficulties, the current practice is to directly produce solid thick sheets and then use a multi-wire cutting method. Due to process limitations, the wireless charging shield produced by this method can only be a single-plane wireless charging shield, and products with a cavity for accommodating the coil in the middle and a shield on the periphery cannot be produced, and the structural shape of the product is greatly restricted. In addition, after the flat wireless charging shield is assembled with the coil, there is no wireless charging shield enclosure inside and outside the coil, which is easy to cause the induced magnetic field to disperse, and the magnetic field gathering effect of the wireless charging shield is poor, which will lead to a reduction in the coupling coefficient of the wireless charging system, affecting the charging height distance, lateral offset distance and wireless transmission efficiency of wireless charging. In order to overcome the above-mentioned product structural defects and the shortcomings of processing technology, an embodiment of the present application provides a wireless charging shielding body, which has a high magnetic coupling coefficient and a good magnetic shielding effect.

[0088] like Figure 1 As shown, it is a schematic diagram of the structure of the wireless charging shield provided by the embodiment of the present application. The wireless charging shield comprises a first shield 1 and a second shield 2, the second shield 2 is arranged on the periphery of the first shield 1, and the first shield 1 and the second shield 2 are enclosed to accommodate the coil 20 (see Figures 3 to 7) cavity 10, the first shielding body 1 and the second shielding body 2 are both formed by stacking at least one layer of soft magnetic material 12. The wireless charging shielding body provided by the present application improves the electromagnetic shielding ability of the wireless charging shielding body to the coil 20 by setting the second shielding body 2 on the periphery of the first shielding body 1. In other words, the use of the wireless charging shielding body provided by the present application can significantly improve the coupling coefficient of the wireless charging system, reduce leakage flux, reduce input power, and thus reduce copper loss, ultimately improve the wireless charging conversion efficiency, and reduce system heating. In addition, the present application does not limit the specific shape of the second shielding body 2, for example, it can be a rectangle, a fan-shaped or other shape, as long as a second shielding body 2 that can be surrounded by the first shielding body 1 to accommodate the coil 20 is set on the periphery of the first shielding body 1. Moreover, the wireless charging shielding body can be applied to both the transmitting end module and the receiving end module, and the wireless charging shielding body can be used according to actual needs.

[0089] like Figure 2 , which is a cross-sectional schematic diagram of the first shielding body provided in the embodiment of the present application. The first shielding body 1 is formed by laminating at least one layer of soft magnetic material 12. Figure 2 The first shielding body 1 is formed by stacking four layers of soft magnetic material 12, and two adjacent layers of soft magnetic material 12 are bonded by double-sided adhesive tape 13. To ensure the insulation of the first shielding body 1, a double-sided adhesive tape 13 is attached above the top layer of soft magnetic material 12, and the upper surface of the double-sided adhesive tape 13 is used to bond and fix the coil 20, and a single-sided adhesive tape 13 is attached below the bottom layer of soft magnetic material 12, and the non-sticky side of the single-sided adhesive tape 13 faces downward.

[0090] It should be noted that when the soft magnetic material is Figure 2 The shield produced by the stacking preparation process shown is a flexible structure. The formed flexible shield has a high magnetic permeability, which can effectively isolate the metal's absorption effect on electromagnetic waves and can also gather electromagnetic waves, thereby improving the efficiency of wireless charging. The flexible shield also has the advantage that its shape and size can be customized arbitrarily, and it can be applied to different wireless charging schemes and coil specifications and shapes. However, the existing shield prepared by using soft magnetic materials by powder metallurgy or compression molding is a rigid structure. The rigid shield formed is not as effective as the flexible shield in terms of electromagnetic shielding and arbitrary shape change. Moreover, it is easier for the rigid shield to achieve the effect of covering the coil, for example, it can be processed by cutting, grinding, etc. In summary, the inventive concept of the present application is based on the formation of a flexible shield by a stacking process, and considers the preparation of a shield structure that can be wrapped around the coil to improve the magnetic coupling coefficient and magnetic shielding effect of the shield.

[0091] like Figure 3As shown, it is a cross-sectional schematic diagram of the cooperation of the wireless charging shield and the coil provided by an embodiment of the present application. In some embodiments, the second shield 2 is integrally formed with the first shield 1. That is, the second shield 2 is formed by bending the shield of the outer periphery of the first shield 1 in the vertical direction Y, so that the first shield 1 and the second shield 2 enclose a cavity 10 for accommodating the coil 20. It can be understood that the height of the second shield 2 along the vertical direction Y should not be lower than the height of the coil 20 along the vertical direction Y, so that the electromagnetic shielding effect of the wireless charging shield on the coil 20 can be better. Since the second shield 2 itself also has a certain flexibility, in order to achieve a better arrangement of the second shield 2 along the vertical direction Y, an indentation can be machined between the first shield 1 and the second shield 2 in advance, and then the second shield 2 can be bent along the indentation in the vertical direction Y. Of course, after the second shield 2 is bent, glue can be applied between the first shield 1 and the second shield 2 to enable the second shield 2 to be better arranged along the vertical direction Y.

[0092] Please continue reading Figure 1 The second shielding body 2 includes a plurality of outer shielding parts 21 and a notch 22 for leading out the coil 20. The notch 22 can be arranged between two outer shielding parts 21, or can be formed inside one outer shielding part 21, that is, the notch 22 is formed by penetrating one outer shielding part 21. The opening size of the notch 22 can be set according to actual needs. Figure 1 In the embodiment, the area occupied by the notch 22 is roughly equal to the area occupied by one outer shielding part 21, that is, the notch 22 can be processed when the second shielding body 2 is processed. In order to enable the second shielding body 2 integrally formed with the first shielding body 1 to be bent, there is a gap 23 between two adjacent outer shielding parts 21, which is not only conducive to the bending of the second shielding body 2, but also can avoid the second shielding body 2 from wrinkling. It can be understood that the total area occupied by multiple gaps 23 is very small compared to the total area occupied by multiple outer shielding parts 21, so the influence of the leakage flux generated by the gaps 23 can be ignored.

[0093] like Figures 4 to 7 As shown, in some embodiments, the second shielding body 2 and the first shielding body 1 are assembled separately, for example, by gluing to achieve the fixation of the second shielding body 2 and the first shielding body 1. Of course, as long as other fixing methods that can achieve the second shielding body 2 and the first shielding body 1 are also within the protection scope of this application, this application does not limit the fixing method of the two.

[0094] like Figure 4 and Figure 5 As shown, the second shielding body 2 is fixed to the first side surface of the first shielding body 1 along the horizontal direction X (i.e. Figure 5 The second side surface of the first shielding body 1 along the vertical direction Y (ie Figure 4 As long as the second shielding body 2 and the first shielding body 1 can be fixed, the present application does not specifically limit the positions where the two are fixed.

[0095] like Figure 4 , Figure 5 and Figure 7 As shown, the stacking direction of the first shielding body 1 is perpendicular to the stacking direction of the second shielding body 2. That is, the stacking direction of the first shielding body 1 is along the normal direction of the winding of the coil 20 (i.e., stacking along the vertical direction Y), and the stacking direction of the second shielding body 2 is perpendicular to the normal direction of the winding of the coil 20 (i.e., stacking along the horizontal direction X), which can facilitate the transmission of the magnetic flux lines generated by the coil 20. Of course, the stacking direction of the first shielding body 1 can also be parallel to or consistent with the stacking direction of the second shielding body 2 (such as Figure 6 As shown), this method is not conducive to the transmission of the magnetic flux lines generated by the coil 20 compared to the former.

[0096] like Figure 7 As shown, the wireless charging shielding body further includes a third shielding body 3, and the first shielding body 1 is provided with an inner hole 11 (also see Figure 1 ), the third shielding body 3 is arranged around the inner hole 11, so that the electromagnetic shielding effect of the coil 20 can be better provided. It is understandable that the provision of the third shielding body 3 is not necessary, and it can be determined according to actual needs. For example, the center of the winding of the coil 20 has a larger diameter, and the provision of the third shielding body 3 can be considered at this time. It is understandable that the height of the third shielding body 3 along the vertical direction Y should not be lower than the height of the coil 20 along the vertical direction Y, so that the electromagnetic shielding effect of the coil 20 can be ensured. Exemplarily, the first shielding body 1 is a circular ring structure, and of course it can also be a square structure with an inner hole. The specific shape of the first shielding body 1 is not specifically limited in this application.

[0097] In some embodiments, the third shielding body 3 is integrally formed with the first shielding body 1 or is assembled separately. The molding method of the third shielding body 3 is the same as that of the second shielding body 2, which will not be described in detail here.

[0098] In some embodiments, the soft magnetic material 12 includes amorphous and / or nanocrystalline materials. Most of the soft magnetic materials 12 used in the prior art are soft ferrite materials. Since the saturation magnetic induction density of soft ferrite materials is relatively low (only about 500mT), it will cause a substantial increase in volume when responding to the use requirements of large currents, which is very disadvantageous. The saturation magnetic induction density of amorphous or nanocrystalline materials can reach 1200-1500mT, so the use of amorphous or nanocrystalline materials can significantly reduce the volume of the wireless charging shield. Of course, the soft magnetic material 12 used in this application can also be made of soft ferrite materials, and can also be made of a composite material of plastic and magnetic powder, as long as it is a soft magnetic material, but when the soft magnetic material 12 is made of amorphous and / or nanocrystalline materials, the volume of the wireless charging shield can be significantly reduced.

[0099] The present application also provides a method for manufacturing a wireless charging shield, and the wireless charging shield can be manufactured by using the manufacturing method. The manufacturing method includes:

[0100] A first shielding body 1 is prepared, and a second shielding body 2 is prepared on the periphery of the first shielding body 1;

[0101] The first shielding body 1 and the second shielding body 2 form a cavity 10 for accommodating the coil 20, and the first shielding body 1 and the second shielding body 2 are both formed by laminating at least one layer of soft magnetic material 12. The wireless charging shielding body provided by the present application can significantly improve the coupling coefficient of the wireless charging system, reduce leakage flux, reduce input power, and thus reduce copper loss, ultimately improving the wireless charging conversion efficiency and reducing system heating.

[0102] In some embodiments, the second shielding body 2 is integrally formed with the first shielding body 1. That is, the second shielding body 2 is formed by bending the shielding body of the outer periphery of the first shielding body 1 in the vertical direction Y, so that the first shielding body 1 and the second shielding body 2 enclose a cavity 10 for accommodating the coil 20. It can be understood that the height of the second shielding body 2 along the vertical direction Y should not be lower than the height of the coil 20 along the vertical direction Y, so that the electromagnetic shielding effect of the wireless charging shielding body on the coil 20 can be better. Since the second shielding body 2 itself also has a certain flexibility, in order to achieve the second shielding body 2 to be better arranged along the vertical direction Y, an indentation can be processed between the first shielding body 1 and the second shielding body 2 in advance, and then the second shielding body 2 can be bent along the indentation in the vertical direction Y. Of course, after the second shielding body 2 is bent, glue can be applied between the first shielding body 1 and the second shielding body 2 to enable the second shielding body 2 to be better arranged along the vertical direction Y.

[0103] In some embodiments, preparing a first shielding body 1 and preparing a second shielding body 2 on the periphery of the first shielding body 1 comprises:

[0104] S1, using at least one layer of soft magnetic material 12 to stack and form a first-state shielding body;

[0105] For example, the first-state shielding body can be a planar structure, that is, a planar structure formed by rolling at least one layer of soft magnetic material 12. For another example, the first-state shielding body can also be a curved surface structure, that is, a curved surface structure formed by rolling at least one layer of soft magnetic material 12. When the first-state shielding body is composed of a layer of soft magnetic material 12, the first-state shielding body only includes a layer of soft magnetic material 12; when the first-state shielding body is composed of two or more layers of soft magnetic material 12, the first-state shielding body includes soft magnetic material 12 and double-sided tape 13 arranged between two adjacent layers of soft magnetic material 12, and at this time, the upper and lower layers of the first-state shielding body are both soft magnetic material 12.

[0106] S2, using the first mold 4 to die-cut the first-state shielding body, and attaching an insulating film to two surfaces of the first-state shielding body die-cut by the first mold 4 along the vertical direction Y to obtain a second-state shielding body;

[0107] like Figure 8 As shown, the first mold 4 has a first circumscribed circle 41, through which the first state shielding body can be die-cut into a circular structure to prepare for the preparation of the second shielding body 2. Of course, the first mold 4 can also have a first inscribed circle 42, through which the first state shielding body with a circular structure can be die-cut into a ring structure to prepare for the preparation of the third shielding body 3. It can be understood that Figure 8 The first circumscribed circle 41 and the first inscribed circle 42 of the first mold 4 are not drawn with solid lines, so that the first mold 4 and the third mold 6 (see Fig.10 ) is distinguished because the difference between the first mold 4 and the third mold 6 is only that the diameters of the first circumscribed circle 41 and the third circumscribed circle 61 are different, and the diameters of the first inscribed circle 42 and the third inscribed circle 62 are different.

[0108] Among them, when the first-state shielding body is composed of a layer of soft magnetic material 12, the first-state shielding body only includes a layer of soft magnetic material 12, and the second-state shielding body is provided with a double-sided tape 13 on one outer surface along the vertical direction Y, and a single-sided tape 14 on the other outer surface; when the first-state shielding body is composed of two or more layers of soft magnetic material 12, the first-state shielding body includes soft magnetic material 12 and double-sided tape 13 arranged between two adjacent layers of soft magnetic material 12. At this time, the upper and lower layers of the first-state shielding body are both soft magnetic materials 12, and the second-state shielding body is provided with a double-sided tape 13 on one outer surface along the vertical direction Y, and a single-sided tape 14 on the other outer surface.

[0109] It should be noted that when the soft magnetic material is Figure 2The shield produced by the stacking preparation process shown is a flexible structure. The formed flexible shield has a high magnetic permeability, which can effectively isolate the metal's absorption effect on electromagnetic waves and can also gather electromagnetic waves, thereby improving the efficiency of wireless charging. The flexible shield also has the advantage that its shape and size can be customized arbitrarily, and it can be applied to different wireless charging schemes and coil specifications and shapes. However, the existing shield prepared by using soft magnetic materials by powder metallurgy or compression molding is a rigid structure. The rigid shield formed is not as effective as the flexible shield in terms of electromagnetic shielding and arbitrary shape change. Moreover, it is easier for the rigid shield to achieve the effect of covering the coil, for example, it can be processed by cutting, grinding, etc. In summary, the inventive concept of the present application is based on the formation of a flexible shield by a stacking process, and considers the preparation of a shield structure that can be wrapped around the coil to improve the magnetic coupling coefficient and magnetic shielding effect of the shield.

[0110] S3, using the second mold 5 to die-cut the second-state shielding body, so that the second-state shielding body has a plurality of gaps 23 and indentations, and obtains a third-state shielding body;

[0111] like Fig. 9 As shown, the second mold 5 has a second circumscribed circle 51 and a circumscribed strip 53, the second circumscribed circle 51 is used to form an indentation on the second state shield body for producing the second shield body 2, and the circumscribed strip 53 is used to form a gap 23 on the second state shield body for producing the second shield body 2. Of course, the second mold 5 may also have a second inscribed circle 52 and an inscribed strip 54, the second inscribed circle 52 is used to form an indentation on the second state shield body for producing the third shield body 3, and the inscribed strip 54 is used to form a gap 23 on the second state shield body for producing the third shield body 3.

[0112] S4, using the third mold 6 to die-cut the third state shielding body, the third state shielding body forms a first shielding body 1 on the side where the indentation is far away from the gap 23, and the third state shielding body is bent in the vertical direction Y on the side where the indentation is close to the gap 23 to form a second shielding body 2;

[0113] like Fig.10As shown, the third mold 6 has a third circumscribed circle 61, through which the third state shielding body can be die-cut into a circular structure, at which time the excess insulating film outside the third state shielding body is die-cut off, and at this time the size of the insulating film outside the third state shielding body along the radial direction of the third state shielding body must exceed the size of the soft magnetic material 12, and then the excess insulating film is bent to insulate the soft magnetic material 12 of the second shielding body 2. Of course, the third mold 6 can also have a third inscribed circle 62, through which the third state shielding body with a circular structure can be die-cut into an annular structure, at which time the excess insulating film inside the third state shielding body is die-cut off, and at this time the size of the insulating film inside the third state shielding body along the radial direction of the third state shielding body must exceed the size of the soft magnetic material 12, and then the excess insulating film is bent to insulate the soft magnetic material 12 of the third shielding body 3, and finally formed as shown in the figure. Fig.12 The wireless charging shield shown.

[0114] like Fig.11 As shown, it is a schematic diagram of the positional relationship of the first mold, the second mold and the third mold provided in the embodiment of the present application. Fig.11 The schematic diagram of the positional relationship between the first mold 4, the second mold 5 and the third mold 6 shown in FIG. Fig.12 The wireless charging shield shown.

[0115] like Fig.13 and Fig.14 As shown, when the wireless charging shield has a third shield 3, the first convex surface 81 of the first fixture 8 can cooperate with the third shield 3 in a planar state to bend the third shield 3. Fig.15 and Fig.16 As shown, when the second fixture 9 includes a second convex surface 91 and a through hole 92 located inside the second convex surface 91, the first shielding body 1 can be abutted against the second convex surface 91, and the third shielding body 3 formed by bending can be buckled in the through hole 92 to avoid interference with the cooperation between the first shielding body 1 and the second convex surface 91, and then the second shielding body 2 is bent by using the second convex surface 91. Of course, when the wireless charging shielding body does not have the third shielding body 3, the first fixture 8 may no longer be needed, and the through hole 92 may no longer be provided inside the second convex surface 91, that is, the bending of the second shielding body 2 can be achieved only by the second convex surface 91 of the second fixture 9.

[0116] In some embodiments, the die-cut area of ​​the second mold 5 is larger than the die-cut area of ​​the first mold 4, so that the size of the insulating film outside the third-state shield body along the radial direction of the third-state shield body exceeds the size of the soft magnetic material 12, and / or the size of the insulating film inside the third-state shield body along the radial direction of the third-state shield body exceeds the size of the soft magnetic material 12, thereby achieving insulation treatment of the soft magnetic material 12 of the second shield body 2 and / or the third shield body 3.

[0117] In some embodiments, the second shielding body 2 and the first shielding body 1 are assembled separately. Figures 4 to 7 As shown, the second shielding body 2 and the first shielding body 1 are fixed by gluing, for example. Of course, other fixing methods that can fix the second shielding body 2 and the first shielding body 1 are also within the protection scope of this application, and this application does not limit the fixing method of the two.

[0118] In some embodiments, the first shielding body 1 is provided with an inner hole 11, and the manufacturing method further includes: preparing a third shielding body 3 around the inner hole 11. The third shielding body 3 is provided around the inner hole 11, so that the coil 20 can be better shielded from electromagnetic waves. It is understandable that the third shielding body 3 is not necessarily provided, and it can be determined according to actual needs. For example, the center of the winding of the coil 20 has a larger diameter, and the third shielding body 3 can be considered to be provided at this time. It is understandable that the height of the third shielding body 3 along the vertical direction Y should not be lower than the height of the coil 20 along the vertical direction Y, so that the electromagnetic shielding effect of the coil 20 can be ensured. Exemplarily, the first shielding body 1 is a circular ring structure, and of course it can also be a square structure with an inner hole. Here, the specific shape of the first shielding body 1 is not specifically limited in this application.

[0119] In some embodiments, the stacking direction of the first shielding body 1 is perpendicular to the stacking direction of the second shielding body 2. That is, the stacking direction of the first shielding body 1 is along the normal direction of the winding of the coil 20 (i.e., stacked along the vertical direction Y), and the stacking direction of the second shielding body 2 is perpendicular to the normal direction of the winding of the coil 20 (i.e., stacked along the horizontal direction X), which can facilitate the transmission of the magnetic flux lines generated by the coil 20. Of course, the stacking direction of the first shielding body 1 can also be parallel to or consistent with the stacking direction of the second shielding body 2 (such as Figure 6 As shown), this method is not conducive to the transmission of the magnetic flux lines generated by the coil 20 compared to the former.

[0120] The embodiment of the present application also provides a wireless charger, which includes the wireless charging shield as mentioned above, or includes a shield manufactured by the manufacturing method of the wireless charging shield as mentioned above. The wireless charger has the same beneficial effects as the wireless charging shield, which will not be described in detail here.

[0121] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for manufacturing a wireless charging shield, characterized in that: Preparing a first shielding body (1), and preparing a second shielding body (2) on the periphery of the first shielding body (1) comprises: At least one layer of soft magnetic material (12) is stacked to form a first-state shielding body; The first-state shielding body is die-cut by a first mold (4), and insulating films are attached to two surfaces of the first-state shielding body die-cut by the first mold (4) along a vertical direction (Y) to obtain a second-state shielding body; The second state shielding body is die-cut by a second mold (5) so that a plurality of gaps (23) and indentations are generated in the second state shielding body, thereby obtaining a third state shielding body; The third-state shielding body is die-cut by using a third mold (6); the third-state shielding body forms the first shielding body (1) on a side of the indentation away from the gap (23); the third-state shielding body is bent in a vertical direction (Y) on a side of the indentation close to the gap (23) to form the second shielding body (2); the first shielding body (1) and the second shielding body (2) enclose a cavity (10) for accommodating a coil (20).

2. The method for manufacturing a wireless charging shield according to claim 1, characterized in that: The die-cutting area of ​​the second die (5) is larger than the die-cutting area of ​​the first die (4).

3. The method for manufacturing a wireless charging shield according to claim 1, characterized in that: The second shielding body (2) and the first shielding body (1) are integrally formed.

4. The method for manufacturing a wireless charging shield according to claim 1, characterized in that: The second shielding body (2) and the first shielding body (1) are assembled and formed separately.

5. The method for manufacturing a wireless charging shield according to claim 1, characterized in that: The stacking direction of the first shielding body (1) is perpendicular to the stacking direction of the second shielding body (2).

6. The method for manufacturing a wireless charging shield according to claim 1, characterized in that: The second shielding body (2) comprises a plurality of outer shielding parts (21) and a notch (22) for leading out the coil (20), and a gap (23) is provided between two adjacent outer shielding parts (21).

7. The method for manufacturing a wireless charging shield according to claim 1, characterized in that: The second shielding body (2) is fixed to a first side surface of the first shielding body (1) along a horizontal direction (X) or to a second side surface of the first shielding body (1) along a vertical direction (Y).

8. The method for manufacturing a wireless charging shield according to any one of claims 1 to 7, characterized in that: The first shielding body (1) is provided with an inner hole (11), and the manufacturing method further comprises: preparing a third shielding body (3) around the inner hole (11).

9. The method for manufacturing a wireless charging shield according to claim 8, characterized in that: The third shielding body (3) and the first shielding body (1) are integrally formed or assembled separately.

10. The method for manufacturing a wireless charging shield according to any one of claims 1 to 7, characterized in that: The soft magnetic material (12) comprises amorphous and / or nanocrystalline material.

11. A wireless charger, characterized in that: The invention comprises a shielding body manufactured by the manufacturing method of a wireless charging shielding body according to any one of claims 1 to 10.

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