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, the coil bundle comprises a first connecting end and a second connecting end, the first connecting end is located at one end of the coil bundle, and the second connecting end is located at the other end of the coil bundle. 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 wire 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 and connected to the first connecting end and the second connecting end respectively, and the jumper wire assembly is located on the side, away from the first flexible circuit board, of the isolating membrane. The invention also provides a wireless charging device and electronic equipment.

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, 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 in 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 component, a jumper component and an isolation film, the coil component includes a first flexible circuit board and a coil bundle arranged on the first flexible circuit board, the coil bundle includes a first connection end and a second connection end, the first connection end is located at one end of the coil bundle, and the second connection end is located at the other end of the coil bundle, the first connection end is located on the first flexible circuit board, and the second connection end extends out of the edge of the first flexible circuit board; the jumper component 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 connection end, and one end of the second wiring harness is connected to the second connection end; the isolation film is attached to the surface of the first flexible circuit board facing the second flexible circuit board, and the jumper component is located on the side of the isolation film away from the first 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 first connection end and a second connection end. The first connection end is located at one end of the coil bundle, and the second connection end is located at the other end of the coil bundle. The first connection end is located on the first flexible circuit board, and the second connection 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 connection end, and one end of the second wiring harness is connected to the second connection end; the isolation film is attached to the surface of the first flexible circuit board facing the second flexible circuit board, and the jumper assembly is located on the side of the isolation film away from the first 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 first connection end and a second connection end, the first connection end is located at one end of the coil bundle, the second connection end is located at the other end of the coil bundle, the first connection end is located on the first flexible circuit board, and the second connection 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 connection end, and one end of the second wiring harness is connected to the second connection end; the isolation film is attached to the surface of the first flexible circuit board facing the second flexible circuit board, and the jumper assembly is located on the side of the isolation film away from the first flexible circuit board; the coil module is used for contactless power reception, and the battery stores power provided by the coil assembly.

[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 the coil bundle, so that the thickness of the coil assembly is thinner; the isolation film of the coil module 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, and thus reducing the overall thickness of the coil module to meet the development trend of thinning electronic devices provided with coil modules. 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 3 A magnified view of the three-dimensional structure of the coil assembly, jumper assembly and isolation membrane.

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

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

[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 Schematic diagram of the cross section along line XV-XV.

[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 partial cross-sectional schematic diagram of a coil module provided in the fourth embodiment of the present invention.

[0030] Fig. 22 It is a schematic diagram of the three-dimensional structure decomposition of the coil module provided by the fifth embodiment of the present invention.

[0031] Fig.23It is a schematic diagram of the three-dimensional structure of a wireless charging device provided by one embodiment of the present invention.

[0032] Fig.24 It is a schematic diagram of the three-dimensional structure of an electronic device provided by another embodiment of the present invention.

[0033] Fig.25 yes Fig.23 The wireless charging device in Fig.24 Schematic diagram of the charging status of an electronic device in a charging station.

[0034] Description of main reference numerals: 100, coil module; 30, coil assembly; 32, first flexible circuit board; 320, first opening; 35, coil bundle; 352, coil portion; 3522, metal routing; 354, first connection end; 356, second connection end; 40, jumper assembly; 42, second flexible circuit board; 422, first strip sheet; 424, second strip sheet; 43, first covering film; 430, avoidance; 432, first covering section; 434, second covering section; 44, first wiring harness; 442, first welding point; 443, first welding portion; 445, first contact point; 45, protective film; 452, first protective sheet ; 454, second protective sheet; 456, third protective sheet; 46, second wiring harness; 462, second welding point; 463, second welding part; 465, second contact point; 50, isolation membrane; 52, second opening; 60, support plate; 62, support surface; 620, accommodating groove; 622, first accommodating section; 623, avoidance groove; 624, second accommodating section; 626, third accommodating section; 64, connecting surface; 70, heat dissipation layer; 80, covering film; 300, wireless charging device; 302, shell; 304, circuit board; 500, electronic equipment; 502, casing; 504, motherboard; 506, battery; 505, display screen. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] See also Figures 1 to 4 The coil module 100 provided by the first embodiment of the present invention includes a coil component 30, a jumper component 40, an isolation film 50, a support plate 60, a heat dissipation layer 70 and a covering film 80; the coil component 30 includes a first flexible circuit board 32 and a coil bundle 35 arranged on the first flexible circuit board 32, the coil bundle 35 includes a coil portion 352, a first connection end 354 and a second connection end 356, the first connection end 354 is located at one end of the coil bundle 35, and the second connection end 356 is located at the other end of the coil bundle 35, specifically, the first connection end is arranged at one end of the coil portion 352, the second connection end 356 is arranged at the other end of the coil portion 352, the first connection end 354 is located at the first flexible circuit board 32, the second connection end 356 extends out of the edge of the first flexible circuit board 32; the jumper assembly 40 includes the second flexible circuit board 42, the first wiring harness 44 and the 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 film 50 is attached to the surface of the first flexible circuit board 32 facing the second flexible circuit board 42, and the jumper assembly 40 is located on the side of the isolation film 50 away from the first flexible circuit board 32, that is, the isolation film 50 is located between the coil assembly 30 and the jumper assembly 40.

[0039] 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.

[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 film 50, one end of the first wiring harness 44 is connected to the first connection end 354 of the coil harness 35, 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 type 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 a coil bundle 35 arranged on a single side of the first flexible circuit board 32. Compared with the coil in the prior art, 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 50 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.

[0041] like Figure 4-Figure 9As shown, a first opening 320 is provided in the middle of the first flexible circuit board 32, the coil bundle 35 is wound around the first opening 320, the first connection end 354 is located at the first opening 320, a second opening 52 is provided in the middle of the isolation membrane 50, the second opening 52 is opposite to the first opening 320, the first wiring harness 44 passes through the second opening 52 through the first welding portion 443 and is welded to the first connection end 354, and the second wiring harness 46 is welded to the second connection end 356 through the second welding portion 463. Specifically, a first welding point 442 is provided at one end of the first wiring harness 44, and the first connection end 354 exposes two opposite side surfaces 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 wiring harness 46, and 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 forms a loop with the first wiring harness 44 and the second wiring harness 46 of the second flexible circuit board 42.

[0042] The first flexible circuit board 32 is a circular flexible circuit board, and the first opening 320 is a circular hole opened in the middle of the circular flexible circuit board. The first opening 320 and the first flexible circuit board 32 share the same axis L; the coil portion 352 includes a plurality of turns of metal wiring 3522, and the plurality of turns of metal wiring 3522 is formed by a metal wiring winding from the outside to the inside on one side of the first flexible circuit board 32 to form a spiral coil, and 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, and each turn of metal wiring 3522 is circular, and the plurality of turns of metal wiring 3522 share the same axis. The multiple 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 on the inner circumference of the first opening 320, and the second connection end 356 is located on 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 turn 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 implementation needs.

[0043] Optionally, the isolation film 50 is a circular insulating sheet, the second opening 52 is located in the middle of the isolation film 50, the second opening 52 and the isolation film 50 are coaxial with the center line L, and the isolation film 50 and the first flexible circuit board 32 are aligned with the surface facing the jumper assembly 40, so that the first flexible circuit board 32 is completely insulated from the second flexible circuit board 42. The isolation film 50 can be, but is not limited to, an insulating organic fiber sheet, a polymer insulating sheet, or a composite insulating sheet.

[0044] In other embodiments, the diameter of the second opening 52 of the isolation membrane 50 is smaller than the diameter of the first opening 320 of the first flexible circuit board 32 , and the isolation membrane 50 is provided with a through hole facing the first connecting end 354 , and the first welding portion 443 passes through the through hole and is welded to the first connecting end 354 .

[0045] Optionally, the jumper assembly 40 further includes a first covering film 43 covering one side of the second flexible circuit board 42, and a protective film 45, the first covering film 43 is stacked between the isolation film 50 and the second flexible circuit board 42, and the protective film 45 covers the side of the second flexible circuit board 42 away from the first covering film 43. Specifically, the first covering film 43 covers the surface of the second flexible circuit board 42 facing the isolation film 50, the shapes of the first covering film 43, the shapes of the second flexible circuit board 42 and the shapes of the protective film 45 are consistent, the second flexible circuit board 42 is clamped by the first covering film 43 and the protective film 45, and the first covering film 43 and the protective film 45 jointly protect the second flexible circuit board 42.

[0046] like Figure 4 and 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, one end of the first strip piece 422 is connected to one end 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 wire harness 44 is provided on one side of the second flexible circuit board 42, and the first wire harness 44 is located on the first strip piece 422 and the second strip piece 424, and the second wire harness 46 is provided on the other side of the second flexible circuit board 42, and the second wire harness 46 is located on the second strip piece 424. Since the width of the first strip piece 422 of the second flexible circuit board 42 is less 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 sheet 422 away from the second strip sheet 424, and the second welding point 462 is located at one end of the second wire harness 46 close to the first strip sheet 422. A first contact point 445 is provided at one end of the first wire harness 44 away from the first welding point 442, and the first contact point 445 is exposed to the outer peripheral surface of the support plate 60; a second contact point 465 is provided at one end of the second wire harness 46 away from the second welding point 462, and the second contact point 465 is exposed to the outer peripheral surface of the support plate 60; the first contact point 445 and the second contact point 465 are used to connect with the circuit system of the contactless charging device.

[0047] 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 in the radial direction of the first flexible circuit board 32, the first wire harness 44 and the second wire harness 46 both extend in 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.

[0048] In other embodiments, the cross-section of the first harness 44 may be, but not limited to, circular, polygonal, or waist-shaped, etc. In other embodiments, the first flexible circuit board 32 may be, but not limited to, rectangular, elliptical, polygonal, or irregular, etc.

[0049] The first covering film 43 is provided with an escape opening 430, and the second welding portion 463 is accommodated in the escape opening 430, so as to facilitate the welding of the second welding portion 463 to the second wiring harness 46 and the second connecting end 356. Specifically, the first covering film 43 is in the shape of a strip sheet, and the first covering film 43 includes a strip-shaped first covering section 432 and a strip-shaped second covering section 434, and one end of the first covering section 432 is connected to the end of the second covering section 434; the shape of the first covering section 432 is consistent with the shape of the first strip sheet 422, and the shape of the second covering section 434 is consistent with the shape of the second strip sheet 424, and the escape opening 430 is located at the first covering film 43 near the first covering section 432. When the first covering film 43 covers the second flexible circuit board 42, the first covering section 432 covers the first strip sheet 422, the second covering section 434 covers the second strip sheet 424, the first welding portion 443 is located at one end of the first covering section 432 away from the second covering section 434, and the second welding portion 463 is accommodated in the avoidance opening 430. The first covering film 43 can be made of, but not limited to, an ultra-thin black covering film, a polyimide film, or an FPC covering film.

[0050] The protective film 45 covers the surface of the second flexible circuit board 42 away from the first cover film 43. The protective film 45 is in the form of a strip sheet, including a strip-shaped first protective sheet 452, a strip-shaped second protective sheet 454, and a third protective sheet 456. The first protective sheet 452 is connected between the second protective sheet 454 and the third protective sheet 456. The shape of the first protective sheet 452 is consistent with the shape of the first strip sheet 422, the shape of the second protective sheet 454 is consistent with the shape of the second strip sheet 424, and the shape of the third protective sheet 456 is consistent with the shape of the first welding point 442. When the protective film 45 covers the surface of the second flexible circuit board 42 away from the first cover film 43, the first protective sheet 452 covers the first strip sheet 422, the second protective sheet 454 covers the second strip sheet 424, and the third protective sheet 456 covers the first welding point 442. The protective film 45 can be made of, but not limited to, an ultra-thin black cover film, a polyimide film, or an FPC cover film. In this embodiment, the protective film 45 is made of a polyester film. The thickness of the protective film 45 is 3 μm to 7.5 μm.

[0051] Figure 12-14 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.

[0052] like Figure 3 and Figure 4As shown, the support plate 60 includes a support surface 62 and a connection surface 64 facing away from the support surface 62. The support surface 62 is provided with a receiving groove 620. The coil assembly 30 is arranged on the support surface 62, and the jumper assembly 40 is received in the receiving groove 620. The receiving groove 620 is a strip-shaped groove corresponding to the jumper assembly 40. One end of the receiving groove 620 passes through the outer side of the support plate 60, and the other end of the receiving groove 620 is close to the center of the support surface 62. The side of the receiving groove 620 away from the coil assembly 30 passes through the connection surface 64. The width of the receiving groove 620 is greater than or equal to the width of the second flexible circuit board 42. The receiving groove 620 passes through the connection surface 64 of the support plate 60 so that the second flexible circuit board 42 can be completely received in the receiving groove 620. That is, when the coil assembly 30 is placed on the support plate 60, the jumper assembly 40 is received in the receiving groove 620, and the support surface 62 is supported on the isolation film 50, so that the thickness of the coil module 100 can be reduced. The shape of the support plate 60 may be the same as or different from the shape of the first flexible circuit board 32. In this embodiment, the support plate 60 is a rectangular nanochip. The support plate 60 may be, but is not limited to, a circular nanochip, a polygonal nanochip, an elliptical nanochip or an irregular nanochip. The area of ​​the support surface 62 is greater than or equal to the area of ​​the first flexible circuit board 32, so that the first flexible circuit board 32 can fall entirely within the area of ​​the support surface 62. The support plate 60 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 transmit electrical energy over a longer distance to expand the application scenarios of wireless power transmission; in addition, the support plate 60 helps the coil module 100 to dissipate heat, further improving the speed and efficiency of electrical energy transmission; the support plate 60 has a high saturation magnetic flux density and relative magnetic permeability, and 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 plate 60 can also effectively reduce the energy loss during the electrical energy transmission process, reduce heat generation and electromagnetic interference to the environment surrounding the coil module 100. In other embodiments, the support plate 60 may also be made of other materials having the above-mentioned effects except the nanocrystalline material.

[0053] The accommodating groove 620 includes a first accommodating section 622, a second accommodating section 624 and a third accommodating section 626 which are interconnected. The first accommodating section 622 is located between the second accommodating section 624 and the third accommodating section 626. The third accommodating section 626 is closer to the center of the supporting surface 62 than the second accommodating section 624. One end of the second accommodating section 624 which is away from the third accommodating section 626 passes through the outer side surface of the supporting plate 60. The first accommodating section 622 is used to accommodate the first strip piece 422. The width of the first accommodating section 622 is greater than or equal to the width of the first strip piece 422. The second accommodating section 624 is used to accommodate the second strip piece 424. The width of the second accommodating section 624 is greater than or equal to the width of the second strip piece 424. The third accommodating section 626 is used to accommodate the first welding point 442. The width of the third accommodating section 626 is greater than or equal to the width of the first welding point 442.

[0054] In this embodiment, the receiving groove 620 passes through the connecting surface 64, and the first cover film 43, the second flexible circuit board 42 and the protective film 45 are all received in the receiving groove 620. It can be understood that the depth of the receiving groove 620 is greater than or equal to the sum of the thicknesses of the first cover film 43, the second flexible circuit board 42 and the protective film 45, and the first cover film 43, the second flexible circuit board 42 and the protective film 45 are all received in the receiving groove 620.

[0055] like Figure 3 and Figure 4 As shown, the heat dissipation layer 70 is attached to the connection surface 64 of the support plate 60, and the covering film 80 covers the surface of the first flexible circuit board 32 away from the heat dissipation layer 70. The heat dissipation layer 70 is used to dissipate heat to 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 layer 70 is consistent with the shape of the support plate 60 so that the heat dissipation layer 70 can be completely attached to the connection surface 64 of the support plate 60. In this embodiment, the heat dissipation layer 70 is a rectangular heat sink. Specifically, the heat dissipation layer 70 uses heat dissipation graphite, so as to improve the heat dissipation efficiency of the coil module 100.

[0056] In other embodiments, the heat dissipation layer 70 may also be made of, but not limited to, a thermally conductive silicone sheet, thermally conductive silicone grease, a ceramic layer, a metal layer, or a thermally conductive gel layer. The covering film 80 covers the surface of the coil assembly 30 away from the heat dissipation layer 70 and the supporting surface 62. The covering film 80 is used to protect the coil assembly 30 and the supporting surface 62 of the supporting plate 60 from being corroded by foreign 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.

[0057] The shape of the covering film 80 is consistent with the shape of the supporting surface 62 of the supporting plate 60. 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. The covering film 80 may be, but is not limited to, an ultra-thin black covering film, a polyimide film, or an FPC covering film. In this embodiment, the covering film 80 is a polyester film. The covering film 80 can protect the surface of the first flexible circuit board 32 from being corroded by external 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.

[0058] like Figure 1-Figure 4 and Figure 15-16 As shown, when assembling the coil module 100, the heat dissipation layer 70 is adhered to the connection surface 64 of the support plate 60; the coil assembly 30 and the jumper assembly 40 are installed to the support surface 62 of the support plate 60, so that the isolation film 50 is adhered to the support surface 62, and the jumper assembly 40 is accommodated in the accommodating groove 620. Specifically, the first covering film 43, the second flexible circuit board 42 and the protective film 45 are all accommodated in the accommodating groove 620, and the protective film 45 is adhered to the heat dissipation layer 70 away from the surface of the second flexible circuit board 42, so that the first flexible circuit board 32 is supported on the support surface 62, 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 jumper assembly 40 away from the coil assembly 30 extends out of the outer side surface of the support plate 60, so that the first contact point 445 and the second contact point 465 are both exposed; the covering film 80 is covered on the supporting surface 62 of the support plate 60 and the first flexible circuit board 32, so that the middle part of the covering film 80 is accommodated in the first opening 320 and the second opening 52.

[0059] Please also read Figure 17-Figure 18 The structure of the coil module in the second embodiment of the present invention is similar to that in the first embodiment, except that the structure of the first flexible circuit board 32a in the second embodiment is slightly different from that in the first embodiment. Specifically, the first flexible circuit board 32a in the second embodiment is rectangular, and the coil portion 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.

[0060] 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.

[0061] 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.

[0062] 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 that 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 that of the metal trace of the coil part in the first embodiment, and the coil part 352b in the third embodiment is formed by a metal trace winding 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.

[0063] 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.

[0064] In other embodiments, the first flexible circuit board 32 may also be, but not limited to, an ellipse, a polygon, etc.; the metal wiring circles of the coil part may also be, but not limited to, an ellipse, a polygon, etc.

[0065] like Fig.21 As shown, the structure of the coil module in the fourth embodiment of the present invention is similar to the structure of the coil module in the first embodiment, except that the depth of the receiving groove 620 of the support plate 60 in the fourth embodiment is different from the depth of the receiving groove 620a of the support plate 60 in the first embodiment. Specifically, the side of the receiving groove 620a in the fourth embodiment away from the covering film 80 is close to the connecting surface 64, that is, the receiving groove 620a does not penetrate the connecting surface 64 of the support plate 60. When the coil assembly 30 is placed on the supporting surface 62 of the supporting plate 60, the protective film 45, the second flexible circuit board 42 and the first covering film 43 are accommodated in the receiving groove 620a together, and the first covering film 43 is attached to the supporting surface 62 to reduce the overall thickness of the coil module.

[0066] The functions and beneficial effects of the coil module in the fourth embodiment are the same as those of the coil assembly in the first embodiment, and are not described in detail here.

[0067] like Fig. 22As shown, the structure of the coil module in the fifth embodiment of the present application is similar to that of the coil module in the first embodiment, except that: a avoidance groove 623 is provided on the support surface 62 of the support plate 60 in the fifth embodiment, and the accommodating groove 620 is connected to the avoidance groove 623; the isolation film 50 is accommodated in the avoidance groove 623, or the isolation film 50 and the first flexible circuit board 32 are accommodated in the avoidance groove 623. Specifically, if the depth of the avoidance groove 623 is greater than or equal to the thickness of the isolation film 50, when the coil assembly 30 is disposed on the support surface 62 of the support plate 60, the isolation film 50 is accommodated in the avoidance groove 623, and the surface of the first flexible circuit board 32 facing the second flexible circuit board 42 is coplanar with the support surface 62, thereby further reducing the overall thickness of the coil module. If the depth of the avoidance groove 623 is equal to or greater than the sum of the thickness of the isolation film 50 and the thickness of the first flexible circuit board 32, when the coil assembly 30 is arranged on the support surface 62 of the support plate 60, the isolation film 50 and the first flexible circuit board 32 are both accommodated in the avoidance groove 623, and the surface of the first flexible circuit board 32 facing away from the second flexible circuit board 42 is coplanar with the support surface 62, 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.

[0068] like Fig.23 One embodiment of the present application also provides a wireless charging device 300, which includes the coil module 100, the shell 302 and the circuit board 304 in any of the above embodiments. The circuit board 304 and the coil module 100 are arranged in the shell 302, and the coil module 100 is electrically connected to the circuit board 304. The coil module 100 is used for contactless power transmission. A charging platform is provided on the shell 302, and the coil module 100 is arranged on the charging platform or close to the inner surface of the charging platform. When the wireless charging device 300 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.

[0069] Since the coil module 100 is relatively thin, the overall thickness of the wireless charging device 300 can be reduced, thereby meeting the requirement of lightweight design of the wireless charging device 300 .

[0070] like Fig.24As shown, another embodiment of the present application further provides an electronic device 500, which includes the coil module 100, the housing 502, the mainboard 504 and the battery 506 in any of the above embodiments, the mainboard 504, the battery 506 and the coil module 100 are all arranged in the housing 502, the battery 506 and the coil module 100 are all electrically connected to the mainboard 504, and the battery 506 is used to provide power to the mainboard 504 and other electronic components. The coil module 100 is used for contactless power reception to provide power to the battery 506. When it is necessary to charge the battery 506 of the electronic device 500, the electronic device 500 is placed on the charging platform of the wireless charging device so that the coil module 100 on the electronic device 500 is facing the coil module 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 500 senses the magnetic field, thereby generating current to charge the battery 506.

[0071] Optionally, the coil module 100 is close to the inner surface of the housing 502 or is disposed on the inner surface.

[0072] In this embodiment, the electronic device 500 is a mobile phone, and the electronic device 500 further includes a display screen 505 . The battery 506 can provide power to the display screen 505 , and the display screen 505 is electrically connected to the mainboard.

[0073] In other embodiments, the electronic device 500 may 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 500 of the present application is relatively thin, so that the overall thickness of the electronic device 500 can be reduced to meet the requirements of lightweight design of the electronic device 500 and facilitate the layout of other electronic components in the electronic device 500.

[0075] like Fig.25 As shown, when the wireless charging device 300 is used to charge the electronic device 500, the electronic device 500 is placed on the charging platform of the wireless charging device 300, the wireless charging device 300 is connected to an external power source, and the coil module 100 of the wireless charging device 300 generates a magnetic field. The coil module 100 in the electronic device 500 senses the magnetic field to generate current to charge the battery 506 of the electronic device 500.

[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 first connection end and a second connection end, the first connection end being located at one end of the coil bundle, the second connection end being located at the other end of the coil bundle, the first connection end being located on the first flexible circuit board, and the second connection 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 attached to a surface of the first flexible circuit board facing the second flexible circuit board, and the jumper assembly is located on a side of the isolation film away from the first flexible circuit board.

2. The coil module according to claim 1, characterized in that: A first opening is provided in the middle of the first flexible circuit board, the coil bundle is wound around the first opening, the first connection end is located at the first opening, a second opening is provided in the middle of the isolation membrane, the second opening is opposite to the first opening, the first wiring harness passes through the second opening through the first welding portion and is welded to the first connection end, and the second wiring harness is welded to the second connection end through the second welding portion.

3. The coil module according to claim 2, characterized in that: The jumper assembly also includes a first covering film covering one side of the second flexible circuit board, and a protective film, wherein the first covering film is stacked between the isolation film and the second flexible circuit board, and the protective film covers the side of the second flexible circuit board away from the first covering film.

4. The coil module according to claim 3, characterized in that: The first covering film is provided with an escape opening, and the second welding portion is accommodated in the escape opening.

5. The coil module according to claim 3, characterized in that: The coil module further includes a support plate, the support plate includes a support surface, the support surface is provided with a receiving groove, the coil assembly is arranged on the support surface, and the jumper assembly is received in the receiving groove.

6. The coil module according to claim 5, characterized in that: The support plate further comprises a connection surface facing away from the support surface, one end of the accommodating groove passes through the outer side surface of the support plate, and a side of the accommodating groove away from the coil assembly passes through or is close to the connection surface.

7. The coil module according to claim 5, characterized in that: A avoiding groove is provided on the supporting surface of the supporting plate, the containing groove is connected to the avoiding groove, the isolation film is contained in the avoiding groove, or the isolation film and the first flexible circuit board are contained in the avoiding groove.

8. The coil module according to claim 5, characterized in that: The coil module further includes a heat dissipation layer and a second protective film. The heat dissipation layer is attached to the connection surface of the support plate, and the second protective film covers the surface of the first flexible circuit board away from the heat dissipation layer.

9. 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 8, 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.

10. 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 8, 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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