Coil module, wireless charging device and electronic equipment

Abstract

The invention provides a coil module which comprises a coil assembly, a jumper assembly and an isolating membrane, the coil assembly comprises a first flexible circuit board and a coil bundle arranged on the first flexible circuit board, the coil bundle comprises a coil part, a first connecting end and a second connecting end, the first connecting end is located on the first flexible circuit board, and the second connecting end is located on the second flexible circuit board. The second connecting end extends out of the edge of the first flexible circuit board; the jumper assembly comprises a second flexible circuit board, a first wire harness and a second wire harness, the first wire harness and the second wire harness are arranged on the second flexible circuit board at intervals, one end of the first wire harness is connected to the first connecting end, and one end of the second wire harness is connected to the second connecting end; the isolating membrane is located between the first flexible circuit board and the second flexible circuit board. The invention further provides a wireless charging device provided with the coil module and electronic equipment provided with the wireless charging device.

Description

Technical Field

[0001] The present invention relates to the field of coils, and in particular to a coil module, a wireless charging device provided with the coil module, and an electronic device provided with the coil module. Background Art

[0002] At present, with the development and rapid popularization of new energy and electric vehicles, portable mobile terminal devices such as mobile phones and smart wearable devices are equipped with wireless charging functions in more and more real-life use scenarios. This wireless charging technology is different from wired connection and can transmit power through contactless power, that is, wireless power transmission is performed by electromagnetic induction or magnetic resonance at the contactless power receiving end and the contactless power transmitting end, so as to charge the rechargeable battery of the portable mobile terminal device. Among them, the coil is an indispensable component for the contactless power transmitting end and the contactless power receiving end to perform contactless power transmission; however, the coil in the prior art is generally a traditional winding coil, which is usually wound by at least two layers of overlapping and stacking, so that the thickness of the traditional winding coil is relatively large, which cannot meet the demand of thinning the coil thickness of the wireless power transmission module at a higher power and higher efficiency. Summary of the invention

[0003] The object of the present invention is to provide a coil module with a relatively thin thickness, a wireless charging device provided with the coil module, and an electronic device provided with the coil module.

[0004] In order to solve the above technical problems, the present invention provides a coil module, which includes a coil assembly, a jumper assembly and an isolation film, the coil assembly includes a first flexible circuit board and a coil bundle arranged on the first flexible circuit board, the coil bundle includes a coil part, a first connecting end connected to one end of the coil part, and a second connecting end connected to the other end of the coil part, the first connecting end is located on the first flexible circuit board, and the second connecting end extends out of the edge of the first flexible circuit board; the jumper assembly includes a second flexible circuit board, a first wiring harness and a second wiring harness, the first wiring harness and the second wiring harness are arranged on the second flexible circuit board at intervals, one end of the first wiring harness is connected to the first connecting end, and one end of the second wiring harness is connected to the second connecting end; the isolation film is located between the first flexible circuit board and the second flexible circuit board.

[0005] The present invention also provides a wireless charging device, which includes a coil module, a shell and a circuit board. The coil module and the circuit board are arranged in the shell. The coil module includes a coil assembly, a jumper assembly and an isolation film. The coil assembly includes a first flexible circuit board and a coil bundle arranged on the first flexible circuit board. The coil bundle includes a coil part, a first connecting end connected to one end of the coil part, and a second connecting end connected to the other end of the coil part. The first connecting end is located on the first flexible circuit board, and the second connecting end extends out of the edge of the first flexible circuit board; the jumper assembly includes a second flexible circuit board, a first wiring harness and a second wiring harness. The first wiring harness and the second wiring harness are arranged on the second flexible circuit board at intervals, one end of the first wiring harness is connected to the first connecting end, and one end of the second wiring harness is connected to the second connecting end; the isolation film is located between the first flexible circuit board and the second flexible circuit board; the coil module is electrically connected to the circuit board, and the coil module is used for contactless power transmission.

[0006] The present invention also provides an electronic device, which includes a coil module, a housing, a battery and a mainboard, wherein the coil module, the mainboard and the battery are all arranged in the housing, and the coil module is electrically connected to the mainboard; the coil module includes a coil assembly, a jumper assembly and an isolation film, the coil assembly includes a first flexible circuit board and a coil bundle arranged on the first flexible circuit board, the coil bundle includes a coil part, a first connecting end connected to one end of the coil part, and a second connecting end connected to the other end of the coil part, the first connecting end is located on the first flexible circuit board, and the second connecting end extends out of the edge of the first flexible circuit board; the jumper assembly includes a second flexible circuit board, a first wiring harness and a second wiring harness, the first wiring harness and the second wiring harness are arranged on the second flexible circuit board at intervals, one end of the first wiring harness is connected to the first connecting end, and one end of the second wiring harness is connected to the second connecting end; the isolation film is located between the first flexible circuit board and the second flexible circuit board; the coil module is used for contactless power reception, and the battery stores power provided by the coil assembly module.

[0007] The first flexible circuit board and the second flexible circuit board of the coil module provided by the present invention are separated by an isolation film, one end of the first wiring harness is connected to the first connecting part of the coil part, and one end of the second wiring harness is connected to the second connecting end of the coil part to form a complete loop; the coil module provided by the present invention only uses a coil bundle arranged in a single-sided first flexible circuit board. Compared with the coil in the prior art that uses a double-layer coil bundle, the coil module of the present invention reduces one layer of coil bundle, so that the thickness of the coil assembly is thinner, thereby reducing the overall thickness of the coil module. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0009] Figure 1 It is a schematic diagram of the three-dimensional structure of the coil module provided by the first embodiment of the present invention.

[0010] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure decomposition of the coil module.

[0011] Figure 3 yes Figure 2 Schematic diagram of further three-dimensional structural decomposition of the coil module.

[0012] Figure 4 yes Figure 3 Schematic diagram of further three-dimensional structural decomposition of the coil module.

[0013] Figure 5 yes Figure 4 An enlarged view of the three-dimensional structure of the coil assembly and jumper assembly.

[0014] Figure 6 yes Figure 5 An enlarged view of section VI in FIG.

[0015] Figure 7 yes Figure 6 Another perspective enlarged view of the three-dimensional structure of the coil assembly and jumper assembly.

[0016] Figure 8 yes Figure 7 An enlarged view of section VIII in FIG.

[0017] Fig. 9 yes Figure 5 Schematic diagram of the three-dimensional structural decomposition of the coil assembly and jumper assembly.

[0018] Fig.10 yes Fig. 9 An enlarged view of the three-dimensional structure of the jumper assembly.

[0019] Fig.11 yes Fig.10 Schematic diagram of the three-dimensional structure explosion of the jumper component.

[0020] Fig.12 yes Fig.11 A schematic diagram of the three-dimensional structure of the jumper assembly from another perspective.

[0021] Fig.13 yes Figure 5 Schematic diagram of the front structure of the coil assembly and jumper assembly.

[0022] Fig.14 yes Fig.13 Magnified view of section XIV in .

[0023] Fig.15 yes Figure 1 A cross-sectional view of a coil module in FIG.

[0024] Fig.16 yes Fig.15 A partial enlarged view of the coil module.

[0025] Fig.17 4 is a front view of a coil assembly provided by a second embodiment of the present invention.

[0026] Fig.18 yes Fig.17 An enlarged view of section XVIII in FIG.

[0027] Fig.19 4 is a front schematic diagram of a coil assembly provided in a third embodiment of the present invention.

[0028] Fig. 20 yes Fig.19 An enlarged view of part XX in FIG.

[0029] Fig.21 It is a schematic diagram of the three-dimensional structure decomposition of the coil module provided by the fourth embodiment of the present invention.

[0030] Fig. 22 It is a schematic diagram of the three-dimensional structure of a wireless charging device provided by one embodiment of the present invention.

[0031] Fig.23 It is a schematic diagram of the three-dimensional structure of an electronic device provided by another embodiment of the present invention.

[0032] Fig.24 yes Fig. 22 The wireless charging device in Fig.23 Schematic diagram of the charging status of an electronic device in a charging station.

[0033] Description of main reference numerals: 100, coil module; 30, coil assembly; 32, first flexible circuit board; 35, coil bundle; 352, coil part; 3522, metal routing; 354, first connection end; 356, second connection end; 40, jumper assembly; 41, isolation film; 42, second flexible circuit board; 422, first strip sheet; 424, second strip sheet; 43, second protective film; 432, first protective sheet; 434, second protective sheet; 436, third protective sheet; 44, first wiring harness; 442, first welding point; 443, first welding part; 445, first contact point; 46, second wiring harness; 462, second welding point; 463, second welding part; 465, second contact point ; 50, supporting layer; 52, first surface; 520, accommodating groove; 522, first accommodating section; 524, second accommodating section; 526, third accommodating section; 54, second surface; 60, first insulating adhesive layer; 62, first avoidance groove; 70, first protective film; 72, avoidance hole; 80, covering film; 82, second avoidance groove; 84, circular cover; 200, wireless charging device; 202, shell; 204, circuit board; 400, electronic equipment; 402, housing; 404, motherboard; 406, battery; 405, display screen; 91, second insulating adhesive; 910, third avoidance groove; 912, first avoidance section; 914, second avoidance section; 916, third avoidance section; 95, heat dissipation film. DETAILED DESCRIPTION

[0034] 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.

[0035] In addition, the following descriptions of the various embodiments are made with reference to the attached drawings to illustrate specific embodiments that the present application may be implemented in. Directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set on..." should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] See also Figures 1 to 4 The first embodiment of the present invention provides a coil module 100, which includes a coil component 30, a jumper component 40, a support layer 50, a first insulating glue layer 60, a first protective film 70, a covering film 80, an isolation film 41, a second protective film 43, a second insulating glue 91 and a heat dissipation film 95. The coil component 30 includes a first flexible circuit board 32 and a coil bundle 35 provided on the first flexible circuit board 32. The coil bundle 35 includes a coil portion 352, a first connecting end 354 connected to one end of the coil portion 352, and a second connecting end 354 connected to the other end of the coil portion 352. 56, the first connection end 354 is located on the first flexible circuit board 32, and the second connection end 356 extends out of the edge of the first flexible circuit board 32; the jumper assembly 40 includes a second flexible circuit board 42, a first wiring harness 44 and a second wiring harness 46, the first wiring harness 44 and the second wiring harness 46 are arranged on the second flexible circuit board 42 at intervals, one end of the first wiring harness 44 is connected to the first connection end 354, and one end of the second wiring harness 46 is connected to the second connection end 356 to form a complete loop; the isolation membrane 41 is located between the first flexible circuit board 32 and the second flexible circuit board.

[0038] It can be understood that the coil module 100 can be applied to a non-contact power receiving device, which can be but not limited to a mobile phone, a smart watch, a tablet computer or a smart wearable electronic device, and the coil module 100 can provide power to the battery of the non-contact power receiving device. The coil module 100 can also be applied to a non-contact power transmission device, which is a wireless charging device, and the coil module 100 can charge the non-contact power receiving device.

[0039] The support layer 50 is stacked on the heat dissipation film 95, and the second insulating glue 91 is connected between the support layer 50 and the heat dissipation film 95; the first flexible circuit board 32 is arranged on the side of the support layer 50 away from the heat dissipation film 95, and the first insulating glue layer 60 is connected between the first flexible circuit board 32 and the support layer 50; the first protective film 70 covers the surface of the coil part 352 away from the second flexible circuit board 42, and the first protective film 70 is used to protect the surface of the coil component 30 from being corroded by external substances, increase the wear resistance and stain resistance of the coil component 30, and improve the reliability and service life of the coil component 30; the second protective film 4 The second protective film 43 covers the surface of the second flexible circuit board 42 away from the first flexible circuit board 32, and is used to protect the surfaces of the second flexible circuit board 42, the first wiring harness 44 and the second wiring harness 46 from being corroded by external substances, thereby increasing the wear resistance and stain resistance of the jumper assembly 40, and improving the reliability and service life of the jumper assembly 40; the covering film 80 covers the surface of the supporting layer 50 away from the heat dissipation film 95, and is used to protect the surface of the supporting layer 50 from being corroded by external substances, thereby increasing the wear resistance and stain resistance of the coil module 100, and improving the reliability and service life of the coil module 100.

[0040] The first flexible circuit board 32 and the second flexible circuit board 42 of the coil module 100 provided by the present invention are separated by an isolation membrane 41, one end of the first wiring harness 44 is connected to the first connection end 354 of the coil part 352, and one end of the second wiring harness 46 is connected to the second connection end 356 of the coil part 352 to form a complete loop. Compared with the winding coil in the prior art, at least two layers of coils are stacked, and covering films are respectively attached to the opposite sides of the coil, and then a glue layer is attached to the surface of the covering film away from the coil; the coil module 100 provided by the present invention only uses the coil bundle 35 in the first flexible circuit board 32 on a single side. Compared with the coil in the prior art, which uses a double-layer coil bundle, the coil module 100 of the present invention reduces one layer of coil bundle, so that the thickness of the coil assembly 30 is thinned, thereby reducing the overall thickness of the coil module 100; and the isolation film 41 of the coil module 100 of the present invention replaces the covering film and glue layer on one side of the coil in the prior art, thereby reducing one film layer, further reducing the overall thickness of the coil module 100, so as to meet the development trend of thinning electronic equipment provided with the coil module 100. Secondly, the coil assembly 30 adopts a single-sided routing method, which reduces the thickness of the remaining stacked layers, and can provide space for increasing the routing copper thickness of the coil part 352, thereby reducing the AC resistance of the coil assembly 30, reducing the temperature of the coil assembly 30 when working, improving temperature rise, improving charging efficiency, and reducing losses. In addition, only one cover film 80 is required to be provided on one coil portion 352, eliminating the need to provide a cover film on the surface of the first flexible circuit board 32 away from the coil portion 352, further reducing the thickness of the coil module 100, and better meeting the needs of lightweight portable devices for contactless power transmission. The thickness refers to the size of each component of the coil module 100 in the stacking direction.

[0041] like Figure 5-Figure 12 As shown, one end of the first wire harness 44 is welded to the first connection end 354, and one end of the second wire harness 46 is welded to the second connection end 356. Specifically, a first welding point 442 is provided at one end of the first wire harness 44, the first connection end 354 is exposed to the opposite sides of the first flexible circuit board 32, and the first welding point 442 is welded to the first connection end 354 through a first welding portion 443; a second welding point 462 is provided at one end of the second wire harness 46, the second connection end 356 extends out of the edge of the first flexible circuit board 32, and the second welding point 462 is welded to the second connection end 356 through a second welding portion 463, so as to realize that the coil harness 35 and the first wire harness 44 and the second wire harness 46 of the second flexible circuit board 42 form a loop.

[0042] Optionally, the first connection end 354 of the coil harness 35 is closer to the center line L of the first flexible circuit board 32 than the second connection end 356, the first harness 44 is spaced parallel to the second harness 46, the length of the first harness 44 is greater than the length of the second harness 46, and the first harness 44 and the second harness 46 are two jumpers of the coil module 100. The first harness 44 is parallel to the first flexible circuit board 32, one end of the first harness 44 having the first welding point 442 is spaced parallel to the surface of the first flexible circuit board 32, and the other end of the first harness 44 away from the first welding point 442 extends out of the edge of the first flexible circuit board 32. Setting the first harness 44 and the second harness 46 to be spaced parallel not only facilitates processing, but also facilitates connection with the circuit system of the contactless charging device.

[0043] The coil portion 352 includes a plurality of turns of metal wiring 3522. The plurality of turns of metal wiring 3522 is formed by winding a metal wiring from the outside to the inside on one side of the first flexible circuit board 32 to form a spiral coil. The plurality of turns of metal wiring 3522 can be wound clockwise or counterclockwise. Since the plurality of turns of metal wiring 3522 can be wound clockwise or counterclockwise to form the spiral coil portion 352, the routing of the metal wiring 3522 is not limited, and the coil portion 352 can be manufactured according to actual needs. In this embodiment, the plurality of turns of metal wiring 3522 can be wound clockwise. The plurality of turns of metal wiring 3522 are spaced from each other, each turn of metal wiring 3522 is circular, and the plurality of turns of metal wiring 3522 are coaxial. The plurality of turns of metal wiring 3522 can be exposed on two opposite surfaces of the first flexible circuit board 32. The first connection end 354 is located inside the coil portion 352, and the second connection end 356 is located at the outer edge of the coil portion 352 and the second connection end 356 extends away from one end of the metal wiring 3522. In this embodiment, the cross section of the metal wiring 3522 is rectangular. In other embodiments, each circle of the metal wiring 3522 can also be rectangular, polygonal or elliptical. Since the metal wiring 3522 can be circular, rectangular, polygonal or elliptical, the coil portion 352 can be designed as a spiral coil of various shapes according to the implementation needs.

[0044] In this embodiment, the isolation film 41 is a strip-shaped insulating sheet, which is consistent with the surface of the second flexible circuit board 42 facing the first flexible circuit board 32, so that the first flexible circuit board 32 is completely insulated from the second flexible circuit board 42. The isolation film 41 can be, but is not limited to, an insulating organic fiber sheet, a polymer insulating sheet, or a composite insulating sheet.

[0045] like Figure 9-12As shown, the second flexible circuit board 42 includes a first strip piece 422 and a second strip piece 424 located at opposite ends thereof, the length of the first strip piece 422 is greater than the length of the second strip piece 424, the width of the second strip piece 424 is greater than the width of the first strip piece 422, the first wiring harness 44 is arranged on one side of the second flexible circuit board 42, and the first wiring harness 44 is located on the first strip piece 422 and the second strip piece 424, the second wiring harness 46 is arranged on the other side of the second flexible circuit board 42, and the second wiring harness 46 is located on the second strip piece 424, and the first strip piece 422 is attached to the surface of the isolation film 41 facing away from the first flexible circuit board 32. Since the width of the first strip piece 422 of the second flexible circuit board 42 is smaller than the width of the second strip piece 424, and the second wire harness 46 is only provided on the second strip piece 424, the area of ​​the second flexible circuit board 42 is small, which can not only reduce the volume of the coil module 100 occupied by the second flexible circuit board 42, but also facilitate the miniaturization and thinness of the coil module 100, and save the materials required for manufacturing the second flexible circuit board 42. The first welding point 442 is located at one end of the first strip piece 422 away from the second strip piece 424, and the second welding point 462 is located at one end of the second wire harness 46 close to the first strip piece 422. A first contact point 445 is provided at one end of the first wiring harness 44 away from the first welding point 442, and the first contact point 445 is exposed to the outer peripheral surface of the supporting layer 50; a second contact point 465 is provided at one end of the second wiring harness 46 away from the second welding point 462, and the second contact point 465 is exposed to the outer peripheral surface of the supporting layer 50; the first contact point 445 and the second contact point 465 are used to connect to the circuit system of the contactless charging device.

[0046] In this embodiment, the first flexible circuit board 32 is circular, the length direction of the second flexible circuit board 42 is parallel to the radial direction of the first flexible circuit board 32, and one end of the second flexible circuit board 42 away from the center line of the first flexible circuit board 32 extends out of the outer periphery of the first flexible circuit board 32. Since the second flexible circuit board 42 extends along the radial direction of the first flexible circuit board 32, the first wire harness 44 and the second wire harness 46 both extend along the radial direction of the first flexible circuit board 32, so that the lengths of the second flexible circuit board 42, the first wire harness 44 and the second wire harness 46 are all short, which can not only save manufacturing materials, but also improve charging efficiency. In this embodiment, the cross-section of the first wire harness 44 is rectangular. In other embodiments, the cross-section of the first wire harness 44 can be, but not limited to, circular, polygonal or waist-shaped. In other embodiments, the first flexible circuit board 32 can be, but not limited to, rectangular, elliptical, polygonal or irregular.

[0047] The second protective film 43 covers the surface of the second flexible circuit board 42 away from the first flexible circuit board 32, and the thickness of the isolation film 41 is less than or equal to the thickness of the second protective film 43, so that the overall thickness of the coil module 100 can be further reduced. The second protective film 43 is in the shape of a strip sheet, which includes a strip-shaped first protective sheet 432, a strip-shaped second protective sheet 434, and a third protective sheet 436. The first protective sheet 432 is connected between the second protective sheet 434 and the third protective sheet 436; the shape of the second protective film 43 is consistent with the shape of the second flexible circuit board 42, specifically, the shape of the first protective sheet 432 is consistent with the shape of the first strip sheet 422, the shape of the second protective sheet 434 is consistent with the shape of the second strip sheet 424, and the shape of the third protective sheet 436 is consistent with the shape of the first welding point 442. When the second protective film 43 covers the second flexible circuit board 42, the first protective sheet 432 covers the first strip sheet 422, the second protective sheet 434 covers the second strip sheet 424, and the third protective sheet 436 covers the first welding point 442. The second protective film 43 may be made of, but not limited to, an ultra-thin black cover film, a polyimide film, or an FPC cover film, etc. The thickness of the second protective film 43 is 3 μm to 7.5 μm.

[0048] like Fig. 9 and Figure 13-14 As shown, the coil portion 352 is formed by a metal trace that is wound around the first flexible circuit board 32 in a clockwise manner for multiple turns, and the current flows out from the first contact point 445 through the second wiring harness 46, the second welding point 462, the second welding portion 463, the second connection end 356 and then along the multiple turns of the metal trace 3522, the first connection end 354, the first welding portion 443, the first welding point 442 and the first wiring harness 44.

[0049] like Figure 4As shown, the coil module 100 further includes a support layer 50, the support layer 50 includes a first surface 52 and a second surface 54 disposed opposite to each other, the first flexible circuit board 32 is stacked on the first surface 52, a receiving groove 520 is provided on the first surface 52, and the second flexible circuit board 42 is received in the receiving groove 520. The receiving groove 520 is a strip-shaped groove corresponding to the second flexible circuit board 42, one end of the receiving groove 520 passes through the outer side of the support layer 50, and the other end of the receiving groove 520 is close to the center of the first surface 52. The width of the receiving groove 520 is greater than or equal to the width of the second flexible circuit board 42, and the receiving groove 520 passes through the second surface 54 of the support layer 50, so that the second flexible circuit board 42 can be completely received in the receiving groove 520. That is, when the coil assembly 30 is placed on the support layer 50, the second flexible circuit board 42 is received in the receiving groove 520, and the first surface 52 is supported on the first flexible circuit board 32, so that the thickness of the coil module 100 can be reduced. The shape of the support layer 50 may be the same as or different from the shape of the first flexible circuit board 32. In this embodiment, the support layer 50 is a rectangular nanochip. The support layer 50 may be, but is not limited to, a circular nanochip, a polygonal nanochip, an elliptical nanochip or an irregular nanochip. The area of ​​the first surface 52 is greater than or equal to the area of ​​the first flexible circuit board 32, so that the first flexible circuit board 32 can all fall into the area of ​​the first surface 52. The support layer 50 can absorb energy from the electromagnetic field, convert the energy into electrical energy and transmit it to the receiving end to improve the efficiency of electrical energy transmission; secondly, it can realize the transmission of electrical energy within a longer distance range to expand the application scenarios of wireless power transmission; in addition, the support layer 50 helps the coil module 100 to dissipate heat, further improving the speed and efficiency of electrical energy transmission; the support layer 50 has a high saturation magnetic flux density and relative magnetic permeability, which can greatly reduce the volume and mass of the magnetic energy coupling mechanism on the basis of ensuring the shielding effect, so as to be suitable for the wireless charging environment of portable electronic devices; the support layer 50 can also effectively reduce the energy loss during the electrical energy transmission process, reduce heat generation and electromagnetic interference to the environment around the coil module 100. In other embodiments, the support layer 50 may also be made of other materials having the above-mentioned effects except the nanocrystalline material.

[0050] like Figure 4 and Fig.11As shown, the accommodating groove 520 includes a first accommodating section 522, a second accommodating section 524 and a third accommodating section 526 which are interconnected. The first accommodating section 522 is located between the second accommodating section 524 and the third accommodating section 526. The third accommodating section 526 is closer to the center of the first surface 52 relative to the second accommodating section 524. One end of the second accommodating section 524 which is away from the third accommodating section 526 passes through the outer side surface of the supporting layer 50. The first accommodating section 522 is opposite to the first strip piece 422, and the width of the first accommodating section 522 is greater than or equal to the width of the first strip piece 422; the second accommodating section 524 is opposite to the second strip piece 424, and the width of the second accommodating section 524 is greater than or equal to the width of the second strip piece 424; the third accommodating section 526 is opposite to the first welding point 442, and the width of the third accommodating section 526 is greater than or equal to the width of the first welding point 442; that is, when the second flexible circuit board 42 is accommodated in the accommodating groove 520, the first strip piece 422 can be accommodated in the first accommodating section 522, the second strip piece 424 can be accommodated in the second accommodating section 524, and the first welding point 442 can be accommodated in the third accommodating section 526.

[0051] In this embodiment, the accommodating groove 520 passes through the second surface 54, and the isolation film 41 and the second flexible circuit board 42 are both accommodated in the accommodating groove 520. It can be understood that when the depth of the accommodating groove 520 is greater than or equal to the sum of the thicknesses of the second flexible circuit board 42 and the isolation film 41, the isolation film 41 and the second flexible circuit board 42 are both accommodated in the accommodating groove 520; when the depth of the accommodating groove 520 is less than the sum of the thicknesses of the second flexible circuit board 42 and the isolation film 41, only the second flexible circuit board 42 is accommodated in the accommodating groove 520.

[0052] In some embodiments, the receiving groove 520 is located on the first surface 52 of the supporting layer 50 , and the receiving groove 520 does not penetrate through the second surface 54 of the supporting layer 50 .

[0053] like Figure 4As shown, the first insulating rubber layer 60 is disposed between the first flexible circuit board 32 and the first surface 52. The first insulating rubber layer 60 is provided with a first avoidance groove 62 corresponding to the second flexible circuit board 42. The isolation film 41 is accommodated in the first avoidance groove 62. The isolation film 41 can not only effectively insulate and isolate the first flexible circuit board 32 from the second flexible circuit board 42, but also reduce the thickness of the coil module 100. The shape of the first insulating rubber layer 60 is consistent with the shape of the first flexible circuit board 32. In this embodiment, the shape of the first insulating rubber layer 60 is consistent with the shape of the coil part 352, that is, the first insulating rubber layer 60 is an annular sheet. One end of the first avoidance groove 62 passes through the inner cavity of the first insulating rubber layer 60, and the other end of the first avoidance groove 62 passes through the outer peripheral surface of the first insulating rubber layer 60. The shape of the first avoidance groove 62 is consistent with the shape of the isolation film 41. When the coil assembly 30 is placed on the first surface 52 of the support layer 50, the first insulating rubber layer 60 is connected between the first flexible circuit board 32 and the first surface 52. Compared with the prior art in which an insulating diaphragm is provided between the coil and the supporting layer, and insulating adhesive needs to be provided on the two opposite sides of the insulating diaphragm respectively, the present application only adopts the first insulating adhesive layer 60 to replace the insulating diaphragm and the insulating adhesive on the two opposite sides of the insulating diaphragm, thereby reducing the thickness of the coil module 100; and the isolation membrane 41 can be accommodated in the first avoidance groove 62, and the second flexible circuit board 42 can be accommodated in the accommodating groove 520, thereby further reducing the thickness of the coil module 100.

[0054] Optionally, the coil module 100 further includes a first protective film 70, which covers the surface of the coil part 352 away from the second flexible circuit board 42, and the thickness of the isolation film 41 is less than the thickness of the first protective film 70. It can be understood that in the related art, protective films are respectively attached to the opposite sides of the coil to protect the coil, while the coil module 100 of the present application only sets the first protective film 70 on the surface of the coil part 352 away from the second flexible circuit board 42, so that the overall thickness of the coil assembly 30 can be reduced; and the thickness of the isolation film 41 is less than the thickness of the first protective film 70, which can reduce the thickness of the coil module 100. In this embodiment, the shape of the first protective film 70 is consistent with the shape of the coil part 352, that is, the first protective film 70 is an annular film, and the center of the first protective film 70 is provided with a position avoidance hole 72. In this embodiment, the first protective film 70 is made of polyimide film. In other embodiments, the first protective film 70 can also be made of, but not limited to, polycarbonate film, polyethylene terephthalate film, or polymethyl methacrylate film.

[0055] Optionally, the coil module 100 further includes a covering film 80, which covers the surface of the support layer 50 away from the second flexible circuit board 42, and the covering film 80 is provided with a second avoidance groove 82 facing the coil portion 352, and the first protective film 70 is accommodated in the second avoidance groove 82. The covering film 80 is used to protect the surface of the support layer 50 from being corroded by external substances, increase the wear resistance and stain resistance of the coil module 100, and improve the reliability and service life of the coil module 100. The shape of the covering film 80 is consistent with the shape of the first surface 52 of the support layer 50. In this embodiment, the covering film 80 is a rectangular covering film. In other embodiments, the covering film 80 may be, but is not limited to, a circular covering film, a polygonal covering film, an elliptical covering film or an irregular covering film, etc. The shape of the second avoidance groove 82 is consistent with the shape of the first protective film 70, so that the first protective film 70 can be completely accommodated in the second avoidance groove 82. When the second avoidance groove 82 is opened on the covering film 80, the covering film 80 forms a circular cover 84 around the inner periphery of the second avoidance groove 82. When the first protective film 70 is accommodated in the second avoidance groove 82, the outer peripheral surface of the first protective film 70 is sealed and fitted with the outer peripheral surface of the second avoidance groove 82, and the outer peripheral surface of the circular cover 84 is sealed and fitted with the inner peripheral surface of the avoidance hole 72, so that the first protective film 70 and the covering film 80 can completely cover the first flexible circuit board 32 and the supporting layer 50. Since the first protective film 70 is directly accommodated in the second avoidance groove 82 of the covering film 80, that is, the first protective film 70 replaces the covering film 80 and the polyester film on the coil part 352, thereby avoiding the first protective film 70 occupying the overall thickness of the coil module 100, thereby further reducing the overall thickness of the coil module 100. The covering film 80 can be, but not limited to, an ultra-thin black covering film, a polyimide film or an FPC covering film, etc. In this embodiment, the covering film 80 is a polyester film. The first protective film 70 and the covering film 80 can protect the surface of the first flexible circuit board 32 from being corroded by foreign substances, increase the wear resistance and stain resistance of the coil part 352 and the first flexible circuit board 32, and improve the reliability and service life of the coil part 352 and the first flexible circuit board 32.

[0056] like Figure 3-Figure 4 and Fig.11As shown, the second insulating adhesive 91 is attached to the second surface 54 of the supporting layer 50, and the second insulating adhesive 91 is provided with a third avoidance groove 910 facing the second flexible circuit board 42, and the second protective film 43 is accommodated in the third avoidance groove 910 to reduce the overall thickness of the coil module 100. The third avoidance groove 910 includes a first avoidance section 912, a second avoidance section 914 and a third avoidance section 916 that are interconnected, the second avoidance section 914 is located between the first avoidance section 912 and the third avoidance section 916, the third avoidance section 916 is closer to the center of the second insulating adhesive 91 relative to the second avoidance section 914, and one end of the second avoidance section 914 away from the third avoidance section 916 passes through the outer side of the second insulating adhesive 91. When the second insulating adhesive 91 is attached to the second surface 54, the first avoidance section 912 faces the first accommodation section 522, the second avoidance section 914 faces the second accommodation section 524, and the third avoidance section 916 faces the third accommodation section 526. The width of the first avoidance section 912 is greater than or equal to the width of the first protective sheet 432, the width of the second avoidance section 914 is greater than or equal to the width of the second protective sheet 434, and the width of the third avoidance section 916 is greater than or equal to the width of the third protective sheet 436; that is, when the second insulating adhesive 91 is attached to the second surface 54, the first protective sheet 432 can be accommodated in the first avoidance section 912, the second protective sheet 434 can be accommodated in the second avoidance section 914, and the third protective sheet 436 can be accommodated in the third avoidance section 916.

[0057] The third avoidance groove 910 may penetrate the surface of the second insulating adhesive 91 away from the support layer 50, or may not penetrate the surface of the second insulating adhesive 91 away from the support layer 50. In this embodiment, the third avoidance groove 910 penetrates the surface of the second insulating adhesive 91 away from the support layer 50.

[0058] like Figure 4 As shown, the heat dissipation film 95 is arranged on the surface of the second insulating glue 91 away from the support layer 50, that is, the heat dissipation film 95 is attached to the surface of the second insulating glue 91 away from the support layer 50, and the heat dissipation film 95 is attached to the surface of the second protective film 43 away from the second flexible circuit board 42. The heat dissipation film 95 is used to dissipate heat for the coil assembly 30 during operation to prevent the coil assembly 30 from overheating, thereby protecting the normal operation of the coil assembly 30 and extending its service life. The shape of the heat dissipation film 95 is consistent with the shape of the support layer 50, so that the heat dissipation film 95 can be completely attached to the second surface 54 of the support layer 50. In this embodiment, the heat dissipation film 95 is a rectangular heat sink. Specifically, the heat dissipation film 95 uses heat dissipation graphite, so as to improve the heat dissipation efficiency of the coil module 100. In other embodiments, the heat dissipation film 95 can also use but is not limited to thermally conductive silicone sheets, thermally conductive silicone grease, etc.

[0059] like Figure 1-Figure 4 and Figure 15-16As shown, when assembling the coil module 100, the heat dissipation film 95 is attached to the second surface 54 of the support layer 50 through the second insulating glue 91, so that the third avoidance groove 910 is opposite to the accommodating groove 520; specifically, the first avoidance section 912 is opposite to and connected to the first accommodating section 522, the second avoidance section 914 is opposite to and connected to the second accommodating section 524, and the third avoidance section 916 is opposite to and connected to the third accommodating section 526; the coil assembly 30 and the jumper assembly 40 are installed to the support layer 50 through the first insulating glue layer 60, so that the first flexible circuit board 32 is connected to the third flexible circuit board 32 through the first insulating glue layer 60. An insulating rubber layer 60 is positioned on the first surface 52, the first avoidance groove 62 is opposite to and connected to the accommodating groove 520, the isolation film 41 is accommodated in the first avoidance groove 62, the jumper assembly 40 is accommodated in the accommodating groove 520, and the second protective film 43 is accommodated in the third avoidance groove 910, so that the first flexible circuit board 32 is supported on the first surface 52, thereby ensuring the flatness of the entire coil assembly 30, improving the wireless power transmission efficiency, and improving the power transmission temperature rise of the coil module 100, thereby enhancing the user experience, and can further reduce the thickness of the coil module 100. One end of the second flexible circuit board 42 away from the coil assembly 30 extends out of the outer side surface of the support layer 50, so that the first contact point 445 and the second contact point 465 are both exposed; the first protective film 70 is covered on the surface of the first flexible circuit board 32 away from the support layer 50, and the covering film 80 is covered on the first surface 52 of the support layer 50 and the first flexible circuit board 32, so that the first protective film 70 is accommodated in the second avoidance groove 82, and the circular cover 84 is accommodated in the avoidance hole 72 of the first protective film 70, and the first protective film 70 and the covering film 80 jointly protect the coil assembly 30 and the support layer 50.

[0060] The second protective film 43 in the present application is accommodated in the third avoidance groove 910, the second flexible circuit board 42 is accommodated in the accommodation groove 520, the isolation film 41 is accommodated in the first avoidance groove 62, and the first protective film 70 is accommodated in the second avoidance groove 82 of the covering film 80, so that the overall thickness of the coil module 100 is relatively thin.

[0061] like Fig.17 and Fig.18 As shown, the structure of the coil module in the second embodiment of the present invention is similar to the structure of the coil module 100 in the first embodiment, except that the structure of the first flexible circuit board 32a in the second embodiment is slightly different from the structure of the first flexible circuit board 32 in the first embodiment. Specifically, the first flexible circuit board 32a in the second embodiment is rectangular, and the coil part 352a is rectangular. A metal trace is wound from the outside to the inside on one side of the first flexible circuit board 32a to form multiple turns of spaced metal traces. The multiple turns of metal traces form a spiral coil, and each turn of the metal trace is rectangular. The multiple turns of metal traces can be wound clockwise or counterclockwise. In this embodiment, the multiple turns of metal traces are wound clockwise.

[0062] In other embodiments, a metal trace is formed on one side of the first flexible circuit board 32a in a counterclockwise manner from the outside to the inside to form multiple turns of spaced metal traces, and the multiple turns of metal traces form a spiral coil, and each turn of the metal trace is a rectangle.

[0063] The functions and beneficial effects of the coil module in the second embodiment are the same as those of the coil assembly in the first embodiment, and are not described in detail here.

[0064] like Fig.19 and Fig. 20 As shown, the structure of the coil module in the third embodiment of the present invention is similar to the structure of the coil module 100 in the first embodiment, except that: the winding direction of the metal trace of the coil part 352b in the third embodiment is opposite to the winding direction of the metal trace of the coil part 352 in the first embodiment. The coil part 352b in the third embodiment is formed by a metal trace from the outside to the inside on one side of the first flexible circuit board 32 to form a spiral coil, and the multiple turns of the metal trace are wound counterclockwise. The multiple turns of the metal trace are spaced from each other, each turn of the metal trace is circular, and the multiple turns of the metal trace share a common axis.

[0065] The functions and beneficial effects of the coil module in the third embodiment are the same as those of the coil assembly in the first embodiment, and are not described in detail here.

[0066] In other embodiments, the first flexible circuit board 32 may also be, but not limited to, an ellipse, a polygon, etc.; the shapes of the metal traces of the coil part may also be, but not limited to, an ellipse, a polygon, etc.

[0067] like Fig.21 As shown, the structure of the coil module in the fourth embodiment of the present application is similar to the structure of the coil module in the first embodiment, except that: a avoidance groove 523 is provided on the first surface 52 of the support layer 50 in the fourth embodiment, and the accommodating groove 520 is connected to the avoidance groove 523; the depth of the avoidance groove 523 is greater than or equal to the thickness of the first insulating rubber layer 60, and when the coil assembly 30 is installed on the first surface 52 of the support layer 50, the first insulating rubber layer 60 is accommodated in the avoidance groove 523, and the surface of the first flexible circuit board 32 facing the second flexible circuit board 42 is coplanar with the first surface 52, thereby further reducing the overall thickness of the coil module.

[0068] In other embodiments, the depth of the avoidance groove 523 is equal to the sum of the thickness of the first insulating rubber layer 60 and the thickness of the first flexible circuit board 32. When the coil assembly 30 is installed on the first surface 52 of the supporting layer 50, the first insulating rubber layer 60 and the first flexible circuit board 32 are both accommodated in the avoidance groove 523, and the surface of the first flexible circuit board 32 facing away from the second flexible circuit board 42 is coplanar with the first surface 52, thereby further reducing the overall thickness of the coil module, improving the efficiency of wireless power transmission, and further improving the charging temperature rise, thereby enhancing the user experience.

[0069] like Fig. 22 One embodiment of the present application also provides a wireless charging device 200, which includes the coil module 100, the shell 202 and the circuit board 204 in any of the above embodiments, the coil module 100 and the circuit board 204 are arranged in the shell 202, the coil module 100 is electrically connected to the circuit board 204, and the coil module 100 is used for contactless power transmission. A charging platform is provided on the shell 202, and the coil module 100 is close to the inner surface of the charging platform or is arranged on the charging platform. When the wireless charging device 200 charges the device to be charged placed on the charging platform, the coil module 100 will generate a magnetic field, and the coil in the device to be charged will generate electromagnetic induction with the magnetic field, thereby generating current, converting electromagnetic energy into electrical energy to charge the battery in the device to be charged.

[0070] Since the coil module 100 is relatively thin, the overall thickness of the wireless charging device 200 can be reduced, thereby meeting the requirement of lightweight design of the wireless charging device 200 .

[0071] like Fig.23 As shown, another embodiment of the present application further provides an electronic device 400, which includes the coil module 100, the housing 402, the mainboard 404 and the battery 406 in any of the above embodiments, the coil module 100, the mainboard 404 and the battery 406 are all arranged in the housing 402, the coil module 100 and the battery 406 are all electrically connected to the mainboard 404, and the battery 406 is used to provide power to the mainboard 404 and other electronic components. The coil module 100 is used for contactless power reception to provide power to the battery 406. When the battery 406 of the electronic device 400 needs to be charged, the electronic device 400 is placed on the charging platform of the wireless charging device so that the coil module 100 on the electronic device 400 is directly opposite to the coil module 100 of the wireless charging device. After the wireless charging device is powered on, the coil module 100 of the wireless charging device generates a changing magnetic field, and the coil module 100 on the electronic device 400 senses the magnetic field, thereby generating current to charge the battery 406.

[0072] Optionally, the coil module 100 is close to the inner surface of the housing 402 or is disposed on the inner surface.

[0073] In this embodiment, the electronic device 400 is a mobile phone, and the electronic device 400 also includes a display screen 405. The battery 406 provides power to the display screen 405, and the display screen 405 is electrically connected to the mainboard. In other embodiments, the electronic device 400 can also be, but not limited to, electronic products that need to be charged, such as tablet computers, smart watches, or smart wearable devices, and the coil module 100 is provided in various electronic products.

[0074] The coil module 100 in the electronic device 400 of the present application is relatively thin, so that the overall thickness of the electronic device 400 can be reduced to meet the requirements of lightweight design of the electronic device 400 and facilitate the layout of other electronic components in the electronic device 400.

[0075] like Fig.24 As shown, when the wireless charging device 200 is used to charge the electronic device 400, the electronic device 400 is placed on the charging platform of the wireless charging device 200, the wireless charging device 200 is connected to an external power source, and the coil module 100 of the wireless charging device 200 generates a magnetic field. The coil module 100 in the electronic device 400 senses the magnetic field to generate current to charge the battery 406 of the electronic device 400.

[0076] The above is an implementation of the embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A coil module, characterized in that: The coil module comprises: A coil assembly, the coil assembly comprising a first flexible circuit board and a coil bundle arranged on the first flexible circuit board, the coil bundle comprising a coil portion, a first connecting end connected to one end of the coil portion, and a second connecting end connected to the other end of the coil portion, the first connecting end being located on the first flexible circuit board, and the second connecting end extending out of an edge of the first flexible circuit board; A jumper assembly, the jumper assembly comprising a second flexible circuit board, a first wire harness and a second wire harness, the first wire harness and the second wire harness are arranged on the second flexible circuit board at intervals, one end of the first wire harness is connected to the first connection end, one end of the second wire harness is connected to the second connection end, and; An isolation film is located between the first flexible circuit board and the second flexible circuit board.

2. The coil module according to claim 1, characterized in that: One end of the first wiring harness is welded to the first connection end, and one end of the second wiring harness is welded to the second connection end.

3. The coil module according to claim 2, characterized in that: The first connection end of the coil harness is closer to the center line of the first flexible circuit board than the second connection end, the first harness is parallel to the second harness, and the length of the first harness is greater than the length of the second harness.

4. The coil module according to claim 2, characterized in that: The second flexible circuit board includes a first strip piece and a second strip piece located at opposite ends thereof, the length of the first strip piece is greater than the length of the second strip piece, the width of the second strip piece is greater than the width of the first strip piece, the first wiring harness is located on the first strip piece and the second strip piece, the second wiring harness is located on the second strip piece, and the first strip piece is adhered to the surface of the isolation film facing away from the first flexible circuit board.

5. The coil module according to claim 2, characterized in that: The coil module further includes a supporting layer, the supporting layer includes a first surface and a second surface disposed opposite to each other, the first flexible circuit board is stacked on the first surface, a receiving groove is provided on the first surface, and the second flexible circuit board is received in the receiving groove.

6. The coil module according to claim 5, characterized in that: The containing groove passes through the second surface, and the isolation film is contained in the containing groove.

7. The coil module according to claim 5, characterized in that: A first insulating adhesive layer is disposed between the first flexible circuit board and the first surface. The first insulating adhesive layer is provided with a first avoidance groove corresponding to the second flexible circuit board. The isolation film is accommodated in the first avoidance groove.

8. The coil module according to claim 5, characterized in that: The coil module further includes a first protective film, which covers a surface of the coil portion facing away from the second flexible circuit board, and a thickness of the isolation film is smaller than a thickness of the first protective film.

9. The coil module according to claim 8, characterized in that: The coil module further includes a covering film, which covers a surface of the first flexible circuit board facing away from the second flexible circuit board, and the covering film is provided with a second avoidance groove facing the coil part, and the first protective film is accommodated in the second avoidance groove.

10. The coil module according to claim 5, characterized in that: The coil module further includes a second protective film, which covers a surface of the second flexible circuit board facing away from the first flexible circuit board, and a thickness of the isolation film is smaller than a thickness of the second protective film.

11. The coil module according to claim 10, characterized in that: The coil module also includes a second insulating adhesive, which is adhered to the second surface of the support layer. The second insulating adhesive is provided with a third avoidance groove facing the second flexible circuit board, and the second protective film is accommodated in the third avoidance groove.

12. The coil module according to claim 11, characterized in that: The coil module further includes a heat dissipation film, which is attached to a surface of the second insulating adhesive facing away from the support layer.

13. The coil module according to claim 5, characterized in that: The supporting layer is made of nanocrystals.

14. A wireless charging device, characterized in that: The wireless charging device includes a coil module, a shell and a circuit board as described in any one of claims 1 to 13, the coil module and the circuit board are arranged in the shell, the coil module is electrically connected to the circuit board, and the coil module is used for contactless power transmission.

15. An electronic device, characterized in that: The electronic device comprises a coil module, a housing, a battery and a mainboard as described in any one of claims 1 to 13, wherein the coil module, the mainboard and the battery are all arranged in the housing, the coil module is electrically connected to the mainboard, the coil module is used for contactless power reception, and the battery stores power provided by the coil assembly module.

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