Electronic equipment and wireless charging system

Abstract

The invention provides electronic equipment and a wireless charging system, relates to the technical field of electronic products, and is used for solving the problem of how to improve the wireless charging efficiency on the premise that the size of a coil is limited. The electronic device includes a first coil board including a first terminal, a second terminal, a first coil substrate, a first coil layer, and a second coil layer. The first coil layer comprises a first coil part and a second coil part; the second coil layer includes a third coil portion and a fourth coil portion. At least part of the third coil part and at least part of the first coil part are connected in parallel to form a first parallel body, and the second coil part, the fourth coil part and the first parallel body are connected between the first terminal and the second terminal in series.

Description

[0001] This application is based on a divisional application with application number 202211641708.6, application date December 20, 2022, and invention name “An electronic device and a wireless charging system”. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the technical field of electronic products, and in particular to an electronic device and a wireless charging system. Background Art

[0003] Wireless charging technology is a technology that uses the principle of electromagnetic induction to transmit power to electrical equipment. During the power transmission process, no charging cable is required, so it has the advantage of being easy to use.

[0004] The power receiving coil is provided in the power-consuming device, and the power receiving coil is used to match the charging coil in the charger to realize power transmission. In the charging system, in order to increase the charging efficiency, the number of turns of the charging coil or the power receiving coil can be increased to increase the mutual inductance between the charging coil and the power receiving coil, thereby improving the wireless charging efficiency.

[0005] However, in some electronic devices, such as small electronic devices, due to limited internal space, increasing the number of turns of the coil will increase the volume occupied by the coil, which is not conducive to installation in the electronic device. Among them, the electronic device can be a charger or an electrical device. Therefore, in these electronic devices, it is difficult to further increase the number of turns of the coil. Based on this, how to improve the efficiency of wireless charging when the coil size is limited is an important research direction for various manufacturers. Summary of the invention

[0006] The present application provides an electronic device and a wireless charging system, which are used to solve the problem of how to make full use of the limited coil thickness space, coil winding width, etc. when the coil size is limited, so as to obtain the optimal impedance and Q value, reduce coil loss and improve wireless charging efficiency.

[0007] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0008] In a first aspect, an electronic device is provided, the electronic device comprising a first coil module for wireless charging. The first coil module comprises a first coil plate. The first coil plate comprises a first terminal, a second terminal, a first coil substrate, a first coil layer, and a second coil layer.

[0009] The first coil substrate includes a first surface and a second surface that are opposite to each other.

[0010] The first coil layer is arranged on the first surface, and the first coil layer includes a first coil part and a second coil part arranged on the periphery of the first coil part. The first coil part includes at least one turn of the first coil, and the innermost turn of the first coil in the first coil part is the innermost turn of the coil in the first coil layer.

[0011] The second coil layer is arranged on the second surface, and the second coil layer includes a third coil part and a fourth coil part arranged on the periphery of the third coil part. The third coil part includes at least one turn of the third coil, and the innermost turn of the third coil in the third coil part is the innermost turn of the coil in the second coil layer.

[0012] At least part of the third coil portion is connected in parallel with at least part of the first coil portion to form a first parallel body, and the second coil portion, the fourth coil portion and the first parallel body are connected in series between the first terminal and the second terminal.

[0013] Among them, the inner diameter of the first coil layer is D11, the outer diameter of the first coil layer is D12, and the outer diameter D1 of the first coil part satisfies the condition: D11≤D1≤(D11+D12) / 2; the inner diameter of the second coil layer is D21, the outer diameter of the second coil layer is D22, and the outer diameter D3 of the third coil part satisfies the condition: D21≤D3≤(D21+D22) / 2.

[0014] In this way, the impedance of the first coil plate can be reduced, the uneven distribution of the induced current in the first coil plate can be improved, the loss of the first coil plate can be reduced, the optimal Q value can be obtained, and the wireless charging efficiency can be improved. At the same time, the second coil part and the fourth coil part are arranged in series with the first parallel body, and the second coil part and the fourth coil part are not arranged in parallel. The number of turns of the coil connected in series between the first terminal and the second terminal can be kept within a large number range to ensure the mutual inductance value between the first coil module and the charging coil, thereby ensuring the wireless charging efficiency.

[0015] In a possible implementation of the first aspect, at least one turn of the first coil corresponds to at least one turn of the third coil, each turn of the first coil is connected in parallel with the corresponding third coil to form a first parallel body, and the second coil part, the fourth coil part and at least one first parallel body are connected in series between the first terminal and the second terminal. In this way, the uneven distribution of coil current can be effectively improved, the impedance can be reduced, and the number of turns of the coil connected in series between the first terminal and the second terminal can be kept within a large number range, so as to improve the charging efficiency.

[0016] In a possible implementation of the first aspect, the number of at least one turn of the first coil and at least one turn of the third coil is equal and corresponds to each other, and each turn of the first coil is connected in parallel with a corresponding turn of the third coil to form a first parallel body. This structure is simple and convenient for alignment.

[0017] In a possible implementation of the first aspect, at least one turn of the first coil is arranged separately from each other. At least one turn of the third coil is electrically connected in sequence from the inside to the outside, and the two ends of each turn of the first coil are electrically connected to the two ends of the corresponding turn of the third coil. In this way, at least one first parallel body formed by at least one turn of the first coil and at least one turn of the third coil realizes the series arrangement of two adjacent first parallel bodies by means of the second connecting portion between two adjacent turns of the third coil. This structure is simple and has a neat appearance.

[0018] In a possible implementation of the first aspect, the two ends of the third coil part are respectively a first end and a second end, the first end is located on the outermost turn of the third coil in the third coil part, and the first end is electrically connected to the end of the fourth coil part facing the third coil part, and the end of the fourth coil part away from the third coil part is electrically connected to the first terminal. The second end is located on the innermost turn of the third coil in the third coil part, the second end is electrically connected to the end of the second coil part facing the first coil part, and the end of the second coil part away from the first coil part is electrically connected to the second terminal. In this way, the second coil part, the fourth coil part and at least one first parallel body are connected in series between the first terminal and the second terminal, and this structure is simple and easy to implement.

[0019] In a possible implementation of the first aspect, the innermost turn of the first coil in the first coil part corresponds to the innermost turn of the third coil, and the end of the innermost turn of the first coil that is electrically connected to the second end is the third end. In the circumferential direction of the first coil part, there is a first gap between the two ends of each turn of the first coil. On this basis, the first coil plate also includes a first connecting portion. The first connecting portion is arranged on the first surface and penetrates the first gap, one end of the first connecting portion is electrically connected to the third end, and the other end is electrically connected to the end of the second coil part facing the first coil part. Thus, with the help of the metallized via between the third end and the second end, and the first connecting portion, the electrical connection between the second end and the end of the second coil part facing the first coil part is achieved, which can avoid the metal layer on the first surface from crossing and ensure the neat appearance.

[0020] In a possible implementation of the first aspect, the first coil portion includes a first turn of the first coil, and the third coil portion includes a second turn of the third coil. The first turn of the first coil includes a first coil segment and a second coil segment, and the first coil segment and the second coil segment are arranged along the circumference of the first turn of the first coil. The first coil segment includes a first inner circle and a first outer circle, and the first outer circle is located outside the first inner circle. The second coil segment includes a second inner circle and a second outer circle, and the second outer circle is located outside the second inner circle. The second turn of the third coil includes a third coil segment and a fourth coil segment, and the third coil segment corresponds to the first coil segment, and the fourth coil segment corresponds to the second coil segment. The third coil segment includes a third inner circle and a third outer circle, and the third outer circle is located outside the third inner circle. The fourth coil segment includes a fourth inner circle and a fourth outer circle, and the fourth outer circle is located outside the fourth inner circle. One end of the first outer ring portion facing the second outer ring portion is electrically connected to one end of the second inner ring portion facing the first inner ring portion, one end of the third outer ring portion facing the fourth outer ring portion is electrically connected to one end of the first outer ring portion facing the second outer ring portion, and one end of the fourth inner ring portion facing the third inner ring portion is electrically connected to one end of the second inner ring portion facing the first inner ring portion. One end of the third inner ring portion facing the fourth inner ring portion is electrically connected to one end of the fourth outer ring portion facing the third outer ring portion, one end of the first inner ring portion facing the second inner ring portion is electrically connected to one end of the third inner ring portion facing the fourth inner ring portion, and one end of the second outer ring portion facing the first outer ring portion is electrically connected to one end of the fourth outer ring portion facing the third outer ring portion. In this way, a turn of the first coil in the first coil part is formed by splicing multiple parts, and a turn of the third coil in the third coil part is also formed by splicing multiple parts. And a turn of the first coil and a corresponding turn of the third coil form an inner and outer cross structure, which can further improve the uneven distribution of current in the inner and outer layers and further reduce impedance.

[0021] In a possible implementation of the first aspect, the first coil layer further includes a fifth coil portion disposed on the periphery of the second coil portion, the fifth coil portion includes at least one turn of the fifth coil, and the outermost turn of the fifth coil in the fifth coil portion forms the outermost turn of the coil in the first coil layer. The second coil further includes a sixth coil portion disposed on the periphery of the fourth coil portion, the sixth coil portion includes at least one turn of the sixth coil, and the outermost turn of the sixth coil in the sixth coil portion forms the outermost turn of the coil in the second coil layer. At least part of the sixth coil portion is connected in parallel with at least part of the fifth coil portion to form a second parallel body, and the second coil portion, the fourth coil portion, the first parallel body and the second parallel body are arranged in series. Among them, the inner diameter D5 of the fifth coil portion satisfies the condition: (D11+D12) / 3≤D5≤D12; the inner diameter D6 of the sixth coil portion satisfies the condition: (D21+D22) / 3≤D6≤D22. In this way, the impedance of the first coil plate can be further reduced, the uneven distribution of the induced current in the first coil plate can be improved, and the charging efficiency can be improved.

[0022] In a possible implementation of the first aspect, at least one turn of the fifth coil corresponds to at least one turn of the sixth coil, and each turn of the fifth coil is connected in parallel with the corresponding sixth coil to form a second parallel body. The second coil portion, the fourth coil portion, the first parallel body and at least one second parallel body are connected in series between the first terminal and the second terminal. In this way, the uneven distribution of coil current can be effectively improved and the impedance can be reduced.

[0023] In a possible implementation of the first aspect, the number of at least one turn of the fifth coil and at least one turn of the sixth coil is equal and corresponds one to one, and each turn of the fifth coil is connected in parallel with a corresponding turn of the sixth coil to form a second parallel body. This structure is simple and convenient for alignment.

[0024] In a possible implementation of the first aspect, at least one turn of the fifth coil is arranged separately from each other. At least one turn of the sixth coil is electrically connected in sequence from the inside to the outside, and the two ends of each turn of the fifth coil are electrically connected to the two ends of the corresponding turn of the sixth coil. In this way, at least one second parallel body formed by at least one turn of the fifth coil and at least one turn of the sixth coil is arranged in series by means of the connection part between two adjacent turns of the sixth coil. This structure is simple and has a neat appearance.

[0025] In a possible implementation of the first aspect, the two ends of the sixth coil part are respectively a fourth end and a fifth end, the fourth end is located on the innermost turn of the sixth coil in the sixth coil part, and the fourth end is electrically connected to an end of the fourth coil part away from the third coil part. The fifth end is located on the outermost turn of the sixth coil in the sixth coil part, and the fifth end is electrically connected to the first terminal. Thus, at least one second parallel body formed by at least one turn of the fifth coil and at least one turn of the sixth coil is connected in series between the fourth coil part and the first terminal. This structure is simple and easy to implement.

[0026] In a possible implementation manner of the first aspect, the first terminal and the second terminal are disposed on the first surface and located outside the first coil layer.

[0027] In a possible implementation manner of the first aspect, the first terminal and the second terminal are disposed on the first surface and located on an inner side of the first coil layer.

[0028] In a possible implementation of the first aspect, the first coil module further includes a second coil plate, the second coil plate is stacked with the first coil plate, the second coil plate includes a third terminal and a fourth terminal, and the third terminal is electrically connected to the second terminal. In this way, the number of turns of the coil in the first coil module can be increased, which is conducive to improving mutual inductance and charging efficiency.

[0029] In a possible implementation manner of the first aspect, the third terminal and the second terminal are integrally formed, or the third terminal and the second terminal are electrically connected via a welding point.

[0030] In a possible implementation of the first aspect, the electronic device further includes a first magnetic isolation sheet, which is located on one side of the first coil module and is stacked with the first coil module. The first magnetic isolation sheet is used to prevent the metal conductor on one side of the first coil module from causing the charging magnetic field to attenuate, thereby playing a role of metal isolation, preventing energy waste, and improving charging efficiency.

[0031] In a possible implementation of the first aspect, the relative magnetic permeability of the material of the first magnetic isolation sheet is greater than or equal to 100. Optionally, the material of the first magnetic isolation sheet includes at least one of ferrite, nanocrystalline, amorphous, silicon steel, permalloy, nickel, neodymium iron boron alloy, samarium, aluminum nickel cobalt alloy and sendust aluminum alloy.

[0032] In a possible implementation of the first aspect, the electronic device further includes a first magnet, the orthographic projection of the first magnet on the first coil plate is located in an area surrounded by the first coil layer and the second coil layer. The first magnet is used to attract the magnet in the charger to achieve alignment of the first coil module with the charging coil in the charger.

[0033] In a second aspect, a charging system is also provided, the charging system comprising an electric device and a charger. The electric device is an electronic device as described in any of the above technical solutions. The charger comprises a second coil module, and the second coil module is used for charging in cooperation with the first coil module.

[0034] Since the charging system provided in the present application includes an electrical device, and the electrical device is an electronic device as described in any of the above technical solutions, the two can solve the same problem and achieve the same effect.

[0035] In a possible implementation manner of the second aspect, the charger further includes a second magnetic isolation sheet. The second magnetic isolation sheet is located at one side of the second coil module and is stacked with the second coil module.

[0036] In a possible implementation manner of the second aspect, the charger further includes a second magnet. An orthographic projection of the second magnet on the plane where the second coil module is located is located in an area surrounded by the coil in the second coil module.

[0037] In a possible implementation of the second aspect, the second magnet includes a central magnet and an outer ring magnet, the central magnet has a relative fifth surface and a sixth surface, and the direction of the fifth surface pointing to the sixth surface is consistent with the direction of the first magnetic isolation sheet pointing to the first coil module. The magnetization direction of the central magnet is parallel to the direction of the fifth surface pointing to the sixth surface. The outer ring magnet is located on the peripheral side of the magnetization direction of the central magnet, and the outer ring magnet is magnetized from one end away from the central magnet to one end facing the central magnet, and the magnetic pole of the end of the outer ring magnet facing the central magnet is the same as the magnetic pole of the end where the sixth surface is located on the central magnet. In this way, the second magnet can concentrate the direction of the magnetic field, avoid magnetic field diffusion, reduce the influence of the magnetic field on the first magnetic isolation sheet, avoid the first magnetic isolation sheet from being magnetically saturated due to excessive magnetic field at the location, thereby avoiding the first magnetic isolation sheet from losing its magnetic isolation ability. At the same time, the thickness of the first magnetic isolation sheet can be made thin, and more height design space can be reserved for the first coil module in the electronic device to increase the number of layers of the coil plate in the first coil module, which is conducive to increasing the number of turns of the coil, improving mutual inductance and charging efficiency. Moreover, since the magnetic pole of the end of the outer ring magnet facing the central magnet is the same as the magnetic pole of the end of the sixth surface on the central magnet, the sixth surface is a magnetic field enhancement surface. On this basis, since the sixth surface faces the magnet in the charger, the magnetic attraction between the magnet and the magnet in the charger can be enhanced to ensure positioning accuracy.

[0038] In a possible implementation of the second aspect, there are multiple outer ring magnets, and the multiple outer ring magnets are evenly arranged around the circumference of the magnetization direction of the central magnet. This structure is simple and the outer ring magnets are less difficult to form. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the structure of a wireless charging system provided in some embodiments of the present application;

[0040] Figure 2 A schematic diagram of the structure of an electronic device provided in some embodiments of the present application;

[0041] Figure 3 for Figure 2 An exploded view of the watch body in the electronic device shown;

[0042] Figure 4 for Figure 3 A three-dimensional view of the charging assembly in the watch body shown;

[0043] Figure 5 for Figure 4 An exploded view of the charging assembly shown;

[0044] Figure 6 for Figure 3 A partial circuit block diagram of the electronic device shown;

[0045] Figure 7 for Figure 5 A three-dimensional view of the first coil module in the charging assembly shown;

[0046] Figure 8 for Figure 7 An exploded view of the first coil module shown;

[0047] Fig. 9 for Figure 8 A further exploded view of the first coil plate in the first coil module;

[0048] Fig.10 A structural schematic diagram of a first coil module provided for related technology;

[0049] Fig.11 for Fig.10 The schematic diagram of the cross-sectional structure of the first coil module at line BB is shown;

[0050] Fig.12 for Fig.11 The electric field distribution diagram of the first coil layer, the second coil layer, the third coil layer and the fourth coil layer in the first coil module during the charging process;

[0051] Fig.13 for Fig. 9 A schematic diagram of an electrical connection path between a first turn of the first coil and a second turn of the third coil in the first coil module;

[0052] Fig.14 An exploded view of a first coil module provided in some other embodiments of the present application;

[0053] Fig.15 for Figure 7 The schematic diagram of the cross-sectional structure of the first coil module at line AA is shown;

[0054] Fig.16 for Figure 8 A further exploded view of the second coil plate in the first coil module;

[0055] Fig.17 A schematic diagram of the structure of a first coil module in some embodiments of the present application when in an expanded state;

[0056] Fig.18 for Figure 7 The current simulation diagram of the first coil module shown;

[0057] Fig.19 A perspective view of a charger provided for some embodiments of the present application;

[0058] Fig. 20 for Fig.19 The schematic diagram of the cross-sectional structure of the charger at the CC line is shown;

[0059] Fig.21 for Fig. 20 The schematic diagram of the structure of the charger when charging the electronic device is shown;

[0060] Fig. 22 A three-dimensional diagram of a second magnet provided in some embodiments of the present application;

[0061] Fig.23 for Fig. 22 A schematic diagram of the cross-sectional structure of the second magnet at line DD is shown;

[0062] Fig.24 The magnetic pole distribution and magnetic field distribution diagram of the traditional magnet provided in some embodiments of the present application;

[0063] Fig.25 for Fig.21 The second magnet in the charger in the charging system shown is Fig.24 The magnetic field distribution diagram of the first magnetic isolation sheet in the conventional structure shown;

[0064] Fig.26 for Fig.23 A magnetic field distribution diagram of the second magnet shown;

[0065] Fig. 27 for Fig.21 The second magnet in the charger in the charging system shown is Fig.23 The magnetic field distribution diagram of the first magnetic isolation sheet in the improved structure shown;

[0066] Fig.28 A three-dimensional diagram of a central magnet provided for some other embodiments of the present application;

[0067] Fig.29 for Fig.28 The magnetic pole distribution diagram of the central magnet shown;

[0068] Fig.30 A three-dimensional diagram of a second magnet provided in some other embodiments of the present application;

[0069] Fig.31 A three-dimensional diagram of a second magnet provided in some other embodiments of the present application;

[0070] Fig.32 A three-dimensional diagram of a second magnet provided in some other embodiments of the present application;

[0071] Fig.33 A three-dimensional diagram of a second magnet provided in some other embodiments of the present application;

[0072] Fig.34 A three-dimensional diagram of a second magnet provided in some other embodiments of the present application;

[0073] Fig.35 Three-dimensional diagrams of six second magnets provided for some other embodiments of the present application. DETAILED DESCRIPTION

[0074] In the embodiments of the present application, the terms "first", "second", "third", "fourth", "fifth", and "sixth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", "fourth", "fifth", and "sixth" may explicitly or implicitly include one or more of the features.

[0075] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0076] In the embodiments of the present application, it should be noted that the description "parallel" means that approximately parallelism is allowed within a certain error range, and the error range can be a range with a deviation angle of less than or equal to 5° relative to absolute parallelism. The description of the direction "consistent" means that approximately consistent is allowed within a certain error range, and the error range can be a range with a deviation angle of less than or equal to 5° relative to absolute consistency.

[0077] The wireless charging process requires a transmitter and a receiver. Figure 1 , Figure 1 A schematic diagram of the structure of a wireless charging system provided for some embodiments of the present application. The wireless charging system includes a charger 100A and a power-consuming device 100B. The charger 100A is also a transmitting end, and the power-consuming device 100B is also a receiving end. The charger 100A has a built-in charging coil TX, and the power-consuming device 100B has a built-in receiving coil RX.

[0078] During the charging process, please continue to refer to Figure 1 The plane where the charging coil TX is located is parallel to the plane where the power receiving coil RX is located, and the area surrounded by the charging coil TX is at least partially opposite to the area surrounded by the power receiving coil RX.

[0079] When the alternating current I flows into the charging coil TX 1When the charging coil TX is turned on, an alternating magnetic field H is generated around the charging coil TX. The magnetic induction lines of the magnetic field H at least partially pass through the area surrounded by the receiving coil RX. Based on this, according to the principle of electromagnetic induction, an alternating current I can be induced in the receiving coil RX. 2 , thus realizing wireless transmission of electric energy. This charging method does not require a charging cable connection, so it is convenient, safe and reliable to use.

[0080] In the charging system, in order to increase the charging efficiency, the number of turns of the charging coil TX or the receiving coil RX can be increased to increase the mutual inductance M between the charging coil TX and the receiving coil RX. Among them, K represents the coupling coefficient, L1 represents the self-inductance of the charging coil TX, and L2 represents the self-inductance of the receiving coil RX. This increases the charging efficiency of the charging system.

[0081] However, in some electronic devices, such as small electronic devices, due to limited internal space, increasing the number of turns of the internal coil will increase the volume occupied by the coil, which is not conducive to installation in the electronic device. Therefore, in these electronic devices, it is difficult to further increase the number of turns of the coil. The electronic device can be a charger 100A or an electric device 100B.

[0082] In order to solve the above technical problems, the present application provides an electronic device, which can be the above charger 100A or the above power-consuming device 100B. The following embodiments are exemplified by taking the electronic device as the above power-consuming device 100B.

[0083] Specifically, when the electronic device is the above-mentioned power-consuming device 100B, the electronic device includes but is not limited to a mobile phone, a tablet computer, a laptop computer, a personal digital assistant (PDA), a personal computer, a notebook computer, a wearable device, a walkman, a radio, etc. Among them, the wearable device includes but is not limited to a smart watch, a smart bracelet, smart clothes, smart glasses and smart headphones. The following embodiments are exemplified by taking the electronic device as a smart watch.

[0084] See also Figure 2 , Figure 2 The electronic device 100 provided in some embodiments of the present application is a schematic diagram of the structure. The electronic device 100 includes a watch body 20 and a watch band 10. The watch body 20 is used to implement the main functions of the smart watch, and the watch band 10 is used to wear the watch body 20 on the wrist of a human body.

[0085] In some embodiments, please refer to Figure 2The watchband 10 may include a first watchband portion 101 and a second watchband portion 102, one end of the first watchband portion 101 and one end of the second watchband portion 102 are connected to opposite ends of the watch body 20. A first locking portion 1011 is provided at the other end of the first watchband portion 101, and a second locking portion 1021 is provided at the other end of the second watchband portion 102. The first locking portion 1011 and the second locking portion 1021 are detachably locked to each other so that the watch body 20 can be worn on a human wrist.

[0086] Among them, the matching structure composed of the first locking part 1011 and the second locking part 1021 can be a buckle structure such as a hook buckle, a concealed buckle, a butterfly buckle, a belt snap buckle, a folding safety buckle, a folding buckle or a pin buckle, and the present application does not make specific limitations on this.

[0087] The following mainly introduces the watch body 20.

[0088] Please continue reading Figure 2 , the watch body 20 is roughly disc-shaped. On this basis, in order to facilitate the description of each embodiment below, an XYZ coordinate system is established for the watch body 20 described in this embodiment and each embodiment below. Specifically, the thickness direction of the watch body 20 is defined as the Z-axis direction, and the plane perpendicular to the Z-axis direction is the XY plane; the position on the watch body 20 for connecting the first strap part 101 is the first position A, and the position on the watch body 20 for connecting the second strap part 102 is the second position B. The first position A and the second position B are located in the XY plane. Based on this, the arrangement direction of the first position A and the second position B is defined as the X-axis direction, and the direction perpendicular to the X-axis direction in the XY plane is the Y-axis direction. It can be understood that the coordinate system setting of the watch body 20 can be flexibly set according to actual needs, and no specific limitation is made here. In some other embodiments, the watch body 20 can also be roughly elliptical, triangular, polygonal, or rectangular, and no specific limitation is made here.

[0089] Please also read Figure 2 and Figure 3 , Figure 3 for Figure 2 The exploded view of the watch body 20 in the electronic device 100 is shown. The watch body 20 includes a watch body 201, a screen 202, an upper watch case 203, a lower watch case 204, a battery ( Figure 3 ), charging assembly 205, first magnet 206 and circuit board assembly 207.

[0090] Understandably, Figure 2 and Figure 3 The watch body 20 includes some components, and the actual shape, size, position and structure of these components are not limited to the following. Figure 2 and Figure 3 In other embodiments, the watch body 20 may also include detection devices such as electrocardiogram (ECG) electrodes and photoplethysmograph (PPG) devices.

[0091] The watch body 201 is a support frame of the watch body 20, and the first position A and the second position B are located on the watch body 201. The watch body 201 can be made of stainless steel to ensure the structural strength of the watch body 201 and the support strength for other components.

[0092] The upper case 203 is connected to one end of the watch body 201 along the Z axis, and the lower case 204 is connected to the other end of the watch body 201 along the Z axis. The upper case 203, the watch body 201 and the lower case 204 constitute the shell of the watch body 20, and the interior of the shell forms a containing space, and the battery, the charging assembly 205, the first magnet 206 and the circuit board assembly 207 are contained in the containing space.

[0093] The material of the upper case 203 includes but is not limited to metal materials such as stainless steel and plastics such as polycarbonate (PC), PC+glass fiber, and ABS plastic (acrylonitrile butadiene styrene plastic).

[0094] The material of the lower case 204 may be a non-metallic material to allow the charging component 205 to receive electricity from the outer side of the lower case 204. The outer side of the lower case 204 refers to: the side of the lower case 204 facing away from the above-mentioned accommodating space.

[0095] The screen 202 is fixed to the upper case 203. The screen 202 is used to display values ​​or graphics such as hour hand, minute hand, second hand, dial, digital time, weather, temperature, ECG signal, human body temperature, heart rate, body fat, voltage, etc.

[0096] The battery is a secondary battery. Specifically, the battery includes but is not limited to a lead-acid battery, a nickel-cadmium battery, a nickel-metal hydride battery, a lithium-ion battery or a lithium polymer battery. The battery is used to supply power to electronic components such as the screen 202 and the circuit board assembly 207, and the battery is also used to store power from the charging assembly 205.

[0097] The charging component 205 receives electricity from the charger using the principle of electromagnetic induction and stores the received electricity in the battery. In other embodiments, when the electronic device 100 is a charger, the charging component 205 is also used to transmit electricity to the power-consuming device.

[0098] See also Figure 4 and Figure 5 , Figure 4 for Figure 3 The three-dimensional diagram of the charging assembly 205 in the watch body 20 is shown. Figure 5 for Figure 4 An exploded view of charging assembly 205 is shown.

[0099] The charging assembly 205 includes a first coil module 1 , a first magnetic isolation sheet 2 and a reinforcement plate 3 .

[0100] The first coil module 1 is a main body for receiving electric power, and the first coil module 1 is a wire wound along a circular extension track. In some embodiments, when the charging component 205 is applied to Figure 3 When in the electronic device 100 shown, the first coil module 1 is stacked with the bottom plate of the lower case 204, that is, the plane where the circular extension trajectory of the wire in the first coil module 1 is located is parallel to the bottom plate of the lower case 204. The bottom plate of the lower case 204 refers to the plate-like portion of the lower case 204 that is farthest from the screen 202. There may be a gap between the first coil module 1 and the bottom plate of the lower case 204, or they may be in direct contact. In this way, the first coil module 1 can receive electricity from the outside of the lower case 204. In other embodiments, when the charging component 205 is applied to Figure 3 When in the electronic device 100 shown, the first coil module 1 can also be stacked with the screen 202 or the upper case 203 to receive power from the outside of the screen 202 or the outside of the upper case 203. The outside of the screen 202 refers to the side of the screen 202 that is opposite to the above-mentioned accommodation space. The outside of the upper case 203 refers to the side of the upper case 203 that is opposite to the above-mentioned accommodation space.

[0101] See also Figure 4 and Figure 5 The first magnetic shielding sheet 2 is stacked with the first coil module 1, that is, the first magnetic shielding sheet 2 is parallel to the plane where the circular extension track of the wire in the first coil module 1 is located. There can be a gap between the first magnetic shielding sheet 2 and the first coil module 1, or they can be in direct contact. Figure 3 When in the electronic device 100 shown, the first magnetic isolation sheet 2 can be located on the side of the first coil module 1 facing away from the lower case 204. The first magnetic isolation sheet 2 is used to prevent the metal conductor on the side of the first coil module 1 facing away from the lower case 204 from causing the charging magnetic field to attenuate, thereby playing the role of metal isolation, preventing energy waste, and improving charging efficiency.

[0102] The first magnetic isolation sheet 2 may include a soft magnetic material. The relative magnetic permeability of the material of the first magnetic isolation sheet may be greater than or equal to 100. For example, the first magnetic isolation sheet 2 may include at least one of ferrite, nanocrystalline, and amorphous. The first magnetic isolation sheet 2 may also include other soft magnetic materials, for example, the first magnetic isolation sheet 2 may include at least one of materials such as silicon steel, permalloy (Ni-Fe), nickel, neodymium iron boron alloy (Nd-Fe-B), samarium, aluminum nickel cobalt alloy (Al-Ni-Co) and iron silicon aluminum alloy (Fe-Si-Al).

[0103] In some embodiments, please refer to Figure 3 and Figure 4 The charging component 205 has an inner hole h, which is used to avoid the ECG electrode, the PPG device and the first magnet 206 to avoid position interference.

[0104] For some examples, see Figure 5 The inner hole h includes a first inner hole portion h1 and a second inner hole portion h2. The first inner hole portion h1 is arranged in the first coil module 1, and the wire in the first coil module 1 is arranged around the first inner hole portion h1. The second inner hole portion h2 is connected to the first inner hole portion h1, and the second inner hole portion h2 is arranged on the first magnetic isolation sheet 2.

[0105] See also Figure 4 and Figure 5 The first coil module 1 includes a first external terminal W1 and a second external terminal W2. The first external terminal W1 and the second external terminal W2 are respectively arranged at two ends of the first coil module 1, and the first external terminal W1 and the second external terminal W2 are used to communicate with Figure 3 The circuit board assembly 207 is electrically connected to transmit the alternating current induced by the first coil module 1 to the circuit board assembly 207.

[0106] On the basis of the above, please refer to Figure 4 , the reinforcing plate 3 and the first magnetic isolation plate 2 are located on the same side of the first coil module 1, and the reinforcing plate 3 is stacked with the first coil module 1. The first external terminal W1 and the second external terminal W2 are folded from the outer edge of the first coil module 1 to the side of the reinforcing plate 3 facing away from the first coil module 1, and are fixed to the surface of the reinforcing plate 3 facing away from the first coil module 1. The reinforcing plate 3 is used to reinforce the first external terminal W1 and the second external terminal W2, so as to realize the electrical connection between the first external terminal W1, the second external terminal W2 and the circuit board assembly 207 by means of spring contact, elastic ejector pin contact and plane metal contact. The material of the reinforcing plate 3 may include at least one of polyimide (PI), PC, PC+glass fiber, and ABS plastic.

[0107] In some embodiments, please refer to Figure 4 and Figure 5 The first magnetic isolation sheet 2 is provided with a notch C, and the reinforcing plate 3 is arranged in the notch C. This avoids the first magnetic isolation sheet 2 and the reinforcing plate 3 from overlapping in thickness in the Z-axis direction, which is conducive to reducing the thickness of the charging assembly 205.

[0108] In other embodiments, the charging assembly 205 may not be provided with a reinforcing plate. In other embodiments, the charging assembly 205 may not be provided with the first magnetic isolation sheet 2.

[0109] The first magnet 206 is used to attract the magnet in the charger to achieve alignment between the first coil module 1 and the charging coil TX in the charger.

[0110] In some embodiments, please refer back to Figure 3 , the first magnet 206 can be accommodated in the inner hole h of the charging assembly 205. In other embodiments, the first magnet 206 can also be embedded in the bottom plate of the lower case 204, which is not specifically limited here.

[0111] Please return to Figure 3 The circuit board assembly 207 is used as the operation control processing center in the electronic device 100. Figure 6 , Figure 6 for Figure 3 Partial circuit block diagram of the electronic device 100 shown. The circuit board assembly 207 includes a power receiving chip 2071, a charging management chip 2072 and a controller 2073. The power receiving chip 2071 is electrically connected to the first coil module 1. The power receiving chip 2071 is used to convert the alternating current received by the first coil module 1 into direct current, and store it in the battery 208 with the help of the charging management chip 2072. In some embodiments, the power receiving chip 2071 may include a rectifier bridge and a low dropout regulator (LDO). The controller is used to control the operation of the power receiving chip 2071. In some embodiments, the controller may be a microprogrammed controller (MCU).

[0112] The following focuses on the introduction of the first coil module 1 in the above embodiment.

[0113] See also Figure 7 and Figure 8 , Figure 7 for Figure 5 The three-dimensional diagram of the first coil module 1 in the charging assembly 205 is shown. Figure 8 for Figure 7 The exploded view of the first coil module 1 is shown. In this embodiment, the first external terminal W1 and the second external terminal W2 are in a flattened state.

[0114] The first coil module 1 includes a first coil plate 11 and a second coil plate 12 which are stacked. The first coil plate 11 and the second coil plate 12 are connected in series between the first external terminal W1 and the second external terminal W2.

[0115] A glue layer 13 is provided between the first coil plate 11 and the second coil plate 12, by means of which the first coil plate 11 and the second coil plate 12 can be fixedly connected. The material of the glue layer includes but is not limited to glue, double-sided glue, 502 glue and the like.

[0116] The following focuses on the first coil plate 11.

[0117] See also Fig. 9 , Fig. 9 for Figure 8 The first coil plate 11 in the first coil module 1 is further exploded. The first coil plate 11 includes a first terminal d1 , a second terminal d2 , a first coil substrate 111 , a first coil layer 112 and a second coil layer 113 .

[0118] The first terminal d1 and the second terminal d2 are used to lead out the circuit of the first coil plate 11. In some embodiments, the first terminal d1 forms the first external terminal W1, and the second terminal d2 is electrically connected to the second coil plate 12.

[0119] The first coil substrate 111 is an insulating substrate having rigidity. For example, the material of the first coil substrate 111 includes but is not limited to at least one of PI, PC, PC+glass fiber and ABS plastic.

[0120] The first coil substrate 111 is in the shape of a circular flat plate. In other embodiments, the first coil substrate 111 may also be in the shape of a circular flat plate, a polygonal flat plate, or an elliptical flat plate, etc., which is not specifically limited here.

[0121] The first coil substrate 111 includes a first surface S1 and a second surface S2 facing each other. Figure 4 When charging the assembly 205, the first surface S1 can face away from the first magnetic isolation sheet 2, and the second surface S2 can face the first magnetic isolation sheet 2. Of course, the first surface S1 can also face the first magnetic isolation sheet 2, and the second surface S2 can face away from the first magnetic isolation sheet 2.

[0122] The first coil layer 112 is disposed on the first surface S1. Specifically, the first coil layer 112 may be a metal pattern layer formed on the first surface S1, or may be a metal wire bonded to the first surface S1. The following embodiments are described on the basis that the first coil layer 112 is a metal pattern layer formed on the first surface S1, which cannot be considered as a special limitation to the present application.

[0123] The first coil layer 112 includes a first coil portion 112 a and a second coil portion 112 b disposed at the periphery of the first coil portion 112 a .

[0124] The first coil portion 112a includes at least one turn of the first coil 112a1. Fig. 9 In the illustrated embodiment, the first coil portion 112a includes two turns of the first coil 112a1.

[0125] The innermost turn of the first coil 112a1 in the first coil portion 112a forms the innermost turn of the coil in the first coil layer 112. The innermost turn of the first coil 112a1 in the first coil portion 112a refers to the turn of the first coil 112a1 in the first coil portion 112a that is closest to the area surrounded by the first coil layer 112 on the first surface S1. The innermost turn of the coil in the first coil layer 112 refers to the turn of the coil in the first coil layer 112 that is closest to the area surrounded by the first coil layer 112 on the first surface S1.

[0126] The inner diameter of the first coil layer 112 is D11, and the outer diameter of the first coil layer 112 is D12. On this basis, the outer diameter D1 of the first coil portion 112a satisfies the condition: D11≤D1≤(D11+D12) / 2.

[0127] The second coil portion 112b includes at least one turn of the second coil 112b1 extending spirally along the first surface S1. Fig. 9 In the illustrated embodiment, the second coil portion 112 b includes two turns of a second coil 112 b 1 extending helically along the first surface S1 .

[0128] Please continue reading Fig. 9 , the second coil layer 113 is disposed on the second surface S2. Specifically, the second coil layer 113 may be a metal pattern layer formed on the second surface S2, or may be a metal wire bonded to the second surface S2. The following embodiments are described on the basis that the second coil layer 113 is a metal pattern layer formed on the second surface S2, which cannot be regarded as a special limitation to the present application.

[0129] The second coil layer 113 includes a third coil portion 113 a and a fourth coil portion 113 b disposed at the periphery of the third coil portion 113 a .

[0130] The third coil portion 113a includes at least one turn of the third coil 113a1. Fig. 9 In the illustrated embodiment, the third coil portion 113a includes two turns of the third coil 113a1.

[0131] The innermost third coil 113a1 in the third coil portion 113a forms the innermost coil in the second coil layer 113. The innermost third coil 113a1 in the third coil portion 113a refers to the third coil 113a1 in the third coil portion 113a that is closest to the area surrounded by the second coil layer 113 on the second surface S2. The innermost coil in the second coil layer 113 refers to the coil in the second coil layer 113 that is closest to the area surrounded by the second coil layer 113 on the second surface S2.

[0132] The inner diameter of the second coil layer 113 is D21, and the outer diameter of the second coil layer 113 is D22. On this basis, the outer diameter D3 of the third coil portion 113a satisfies the condition: D21≤D3≤(D21+D22) / 2.

[0133] The fourth coil portion 113b also includes at least one turn of the fourth coil 113b1 extending helically along the second surface S2. Fig. 9 In the illustrated embodiment, the fourth coil portion 113 b includes two turns of a fourth coil 113 b 1 extending helically along the second surface S2 .

[0134] On the basis of the above, at least part of the third coil part 113a is connected in parallel with at least part of the first coil part 112a to form a first parallel body. Specifically, the two parts forming the first parallel body can be a section of a turn of the third coil 113a1 in the third coil part 113a and a section of a turn of the first coil 112a1 in the first coil part 112a, or a turn of the third coil 113a1 in the third coil part 113a and a turn of the first coil 112a1 in the first coil part 112a, or multiple turns of the third coil 113a1 in the third coil part 113a and multiple turns of the first coil 112a1 in the first coil part 112a, or the entire third coil part 113a and the entire first coil part 112a. No specific limitation is made here.

[0135] In some embodiments, please refer to Fig. 9, at least one turn of the first coil 112a1 included in the first coil part 112a corresponds to at least one turn of the third coil 113a1 included in the third coil part 113a. The meaning of "corresponding" in this embodiment and the following embodiments all refers to "relative", that is, the two overlap in the orthographic projection of the first surface S1 or the second surface S2. Specifically, the at least one turn of the first coil 112a1 and the at least one turn of the third coil 113a1 can be equal in number and correspond one-to-one, or one turn of the first coil 112a1 can correspond to multiple turns of the third coil 113a1, or multiple turns of the first coil 112a1 correspond to one turn of the third coil 113a1, which is not specifically limited here. The following embodiments are introduced on the basis that the at least one turn of the first coil 112a1 and the at least one turn of the third coil 113a1 are equal in number and correspond one-to-one.

[0136] Each turn of the first coil 112a1 is connected in parallel with the corresponding third coil 113a1 to form a first parallel body. In order to realize the parallel connection of the first coil 112a1 and the corresponding third coil 113a1, optionally, please continue to refer to Fig. 9 , a first metallized via 114 and a second metallized via 115 are provided on the first coil substrate 111. The first metallized via 114 is electrically connected between one end of the first coil 112a1 and one end of the corresponding third coil 113a1, and the second metallized via 115 is electrically connected between the other end of the first coil 112a1 and the other end of the corresponding third coil 113a1. Thus, by realizing parallel connection with the help of metallized vias, the neatness of the appearance of the first coil plate 11 can be ensured. Of course, in other embodiments, the two ends of the first coil 112a1 can also be electrically connected to the two ends of the corresponding third coil 113a1 respectively with the help of electrical connection structures such as wires to realize parallel connection, which is not specifically limited here.

[0137] On the basis of the above, the second coil portion 112b, the fourth coil portion 113b and the first parallel body are connected in series between the first terminal d1 and the second terminal d2.

[0138] In this way, the impedance of the first coil plate 11 can be reduced, the uneven distribution of the induced current in the first coil plate 11 can be improved, the loss of the first coil plate 11 can be reduced, the optimal Q value can be obtained, and the wireless charging efficiency can be improved. At the same time, the second coil part 112b and the fourth coil part 113b are arranged in series with the first parallel body, and the second coil part 112b and the fourth coil part 113b are not arranged in parallel, so that the number of turns of the coil connected in series between the first terminal d1 and the second terminal d2 can be maintained within a large number range to ensure the mutual inductance between the first coil module and the charging coil, thereby ensuring the wireless charging efficiency.

[0139] For further elaboration of the above effects, see Fig.10 and Fig.11 , Fig.10 A schematic diagram of the structure of a first coil module 1 provided in the related art, Fig.11 for Fig.10 The schematic diagram of the cross-sectional structure of the first coil module 1 at the BB line is shown. In the present embodiment, the first coil module 1 also includes a first coil plate 11 and a second coil plate 12 stacked and a glue layer 13 disposed between the first coil plate 11 and the second coil plate 12. The first coil plate 11 includes a first coil substrate 111 and a first coil layer 112 and a second coil layer 113 disposed on two opposite surfaces of the first coil substrate 111, respectively. The second coil plate 12 includes a second coil substrate 121 and a third coil layer 122 and a fourth coil layer 123 disposed on two opposite surfaces of the second coil substrate 121, respectively. The first coil layer 112, the second coil layer 113, the third coil layer 122 and the fourth coil layer 123 each include a multi-turn coil extending along a plane spiral, and the first coil layer 112, the second coil layer 113, the third coil layer 122 and the fourth coil layer 123 are connected in series between the first external terminal W1 and the second external terminal W2.

[0140] See also Fig.12 , Fig.12 for Fig.11 The electric field distribution diagram of the first coil layer 112, the second coil layer 113, the third coil layer 122 and the fourth coil layer 123 in the first coil module 1 during the charging process is shown. Fig.12 It can be seen that less than 1 / 2 of the coil facing the inner edge of the first coil module 1 is affected by the charging magnetic field, and the internal current is unevenly distributed and the impedance is relatively large.

[0141] Therefore, the comparison Figure 10-12 The related technology shown in the embodiment of the present application, the first coil part 112a and the third coil part 113a in the first coil plate 11 belong to the part less than 1 / 2 of the first coil module 1 facing the inner edge. On this basis, at least part of the third coil part 113a is connected in parallel with at least part of the first coil part 112a to form a first parallel body, and the second coil part 112b, the fourth coil part 113b and the first parallel body are connected in series between the first terminal d1 and the second terminal d2, which can improve the uneven distribution of coil current, reduce impedance, and help improve the charging efficiency of the first coil module. At the same time, the second coil part 112b, the fourth coil part 113b and the first parallel body are arranged in series, and the second coil part 112b and the fourth coil part 113b are not arranged in parallel, so that the number of turns of the coil connected in series between the first terminal d1 and the second terminal d2 can be kept within a large number range to ensure the mutual inductance value between the first coil module and the charging coil, thereby ensuring the wireless charging efficiency.

[0142] The following is an explanation of the embodiments of the present application.

[0143] Please return to Fig. 9 , at least one turn of the first coil 112a1 included in the first coil part 112a is respectively connected in parallel with at least one turn of the third coil 113a1 included in the third coil part 113a, so as to form at least one first parallel body. On this basis, the second coil part 112b and the fourth coil part 113b can be arranged in series with all the first parallel bodies in the at least one first parallel body, or can be arranged in series with some of the first parallel bodies in the at least one first parallel body, which is not specifically limited here.

[0144] In some embodiments, the second coil portion 112b, the fourth coil portion 113b and all the first parallel bodies in the at least one first parallel body are arranged in series. That is, all the first parallel bodies in the at least one first parallel body are arranged in series, and the second coil portion 112b, the fourth coil portion 113b and the at least one first parallel body in series are arranged in series.

[0145] For example, Fig. 9 In the embodiment shown, two turns of the first coil 112a1 are respectively connected in parallel with two turns of the third coil 113a1 to form two first parallel bodies. On this basis, the two first parallel bodies are arranged in series, and the second coil part 112b and the fourth coil part 113b are arranged in series with the two first parallel bodies in series.

[0146] In this way, the uneven distribution of coil current can be effectively improved, the impedance can be reduced, and the number of turns of the coil connected in series between the first terminal d1 and the second terminal d2 can be maintained within a larger range, so as to improve the charging efficiency.

[0147] In the above embodiments, in order to realize the series connection of at least one first parallel body, in some embodiments, please continue to refer to Fig. 9 , the at least one turn of the first coil 112a1 included in the first coil part 112a is arranged separately from each other. That is, the at least one turn of the first coil 112a1 is arranged at intervals and does not contact each other. For example, Fig. 9 In the illustrated embodiment, the first coil portion 112 a includes two turns of the first coil 112 a 1 that are disposed separately from each other.

[0148] On the basis of the above, the at least one turn of the third coil 113a1 included in the third coil part 113a is electrically connected in sequence from the inside to the outside. For example, Fig. 9In the illustrated embodiment, the two turns of the third coil 113a1 included in the third coil portion 113a are electrically connected in sequence through the second connecting portion a2, the second connecting portion a2 is disposed on the second surface S2, and the second connecting portion a2 is integrally formed with the two adjacent turns of the third coil 113a1, so as to ensure a neat appearance.

[0149] On the basis of the above, the two ends of each turn of the first coil 112a1 are electrically connected to the two ends of the corresponding turn of the third coil 113a1. For example, please refer to Fig. 9 The two ends of each turn of the first coil 112a1 are electrically connected to the two ends of the corresponding turn of the third coil 113a1 by means of metallized vias (including the first metallized via 114 and the second metallized via 115). The number of the first metallized via 114 and the second metallized via 115 can be one or more. Fig. 9 In the illustrated embodiment, the number of the first metallized vias 114 and the number of the second metallized vias 115 are both two.

[0150] In this way, at least one first parallel body formed by at least one turn of the first coil 112a1 and at least one turn of the third coil 113a1 realizes the series arrangement of two adjacent first parallel bodies by means of the second connecting portion a2 between two adjacent turns of the third coil 113a1. This structure is simple and has a neat appearance.

[0151] Based on any of the above embodiments, in order to further improve the uniformity of current distribution, please refer to Fig. 9 The first coil part 112a includes a first turn of the first coil 112a1, and the third coil part 113a includes a second turn of the third coil 113a1. The first turn of the first coil 112a1 can be any turn of the first coil 112a1 in the first coil part 112a, and the second turn of the third coil 113a1 can also be any turn of the third coil 113a1 in the third coil part 113a, and the second turn of the third coil 113a1 corresponds to the first turn of the first coil 112a1.

[0152] See also Fig.13 , Fig.13 for Fig. 9 The schematic diagram of the electrical connection path of the first turn of the first coil 112a1 and the second turn of the third coil 113a1 in the first coil module 1 is shown. In this embodiment, the first turn of the first coil 112a1 is the innermost turn of the first coil 112a1 in the first coil part 112a, and the second turn of the third coil 113a1 is the innermost turn of the third coil 113a1 in the third coil part 113a for exemplary description.

[0153] The first turn of the first coil 112a1 includes a first coil segment k1 and a second coil segment k2, and the first coil segment k1 and the second coil segment k2 are arranged along the circumference of the first turn of the first coil 112a1. The first coil segment k1 and the second coil segment k2 can be two pairs of semicircular arc segments, or the first coil segment k1 can be a major arc segment and the second coil segment k2 can be an inferior arc segment, or the first coil segment k1 can be an inferior arc segment and the second coil segment k2 can be a major arc segment; or both the first coil segment k1 and the second coil segment k2 can be inferior arc segments.

[0154] The first coil segment k1 includes a first inner ring portion k11 and a first outer ring portion k12. The first outer ring portion k12 is located outside the first inner ring portion k11. The outside of the first inner ring portion k11 refers to: the side of the first inner ring portion k11 away from the area surrounded by the first coil portion 112a on the first surface S1. The first outer ring portion k12 and the first inner ring portion k11 can be connected or spaced apart. This embodiment and the following embodiments are described on the basis that the first outer ring portion k12 and the first inner ring portion k11 are spaced apart. In this way, the first outer ring portion k12 and the first inner ring portion k11 are independent of each other, and the internal currents are separated from each other.

[0155] In addition, the second coil segment K2 includes a second inner ring portion k21 and a second outer ring portion k22. The second outer ring portion k22 is located outside the second inner ring portion k21. The outside of the second inner ring portion k21 refers to: the side of the second inner ring portion k21 away from the area surrounded by the first coil portion 112a on the first surface S1. The second outer ring portion k22 and the second inner ring portion k21 can be connected or spaced apart. This embodiment and the following embodiments are described on the basis that the second outer ring portion k22 and the second inner ring portion k21 are spaced apart. In this way, the second outer ring portion k22 and the second inner ring portion k21 are independent of each other, and the internal currents are separated from each other.

[0156] Please continue reading Fig.13 The second turn of the third coil 113a1 includes a third coil segment n1 and a fourth coil segment n2, and the third coil segment n1 and the fourth coil segment n2 are arranged along the circumference of the second turn of the third coil 113a1. The third coil segment n1 and the fourth coil segment n2 can be two pairs of semicircular arc segments, or the third coil segment n1 can be a major arc segment and the fourth coil segment n2 can be a minor arc segment, or the third coil segment n1 can be a minor arc segment and the fourth coil segment n2 can be a major arc segment; or the third coil segment n1 and the fourth coil segment n2 can be both minor arc segments. The third coil segment n1 corresponds to the first coil segment k1, and the fourth coil segment n2 corresponds to the second coil segment k2.

[0157] The third coil segment n1 includes a third inner ring portion n11 and a third outer ring portion n12. The third outer ring portion n12 is located outside the third inner ring portion n11. The outside of the third inner ring portion n11 refers to the side of the third inner ring portion n11 away from the area surrounded by the third coil portion 113a on the second surface S2. The third outer ring portion n12 and the third inner ring portion n11 can be connected or spaced apart. This embodiment and the following embodiments are described on the basis of the spaced apart arrangement of the third outer ring portion n12 and the third inner ring portion n11. In this way, the third outer ring portion n12 and the third inner ring portion n11 are independent of each other, and the internal currents are separated from each other.

[0158] In addition, the fourth coil segment n2 includes a fourth inner turn portion n21 and a fourth outer turn portion n22. The fourth outer turn portion n22 is located outside the fourth inner turn portion n21. The outside of the fourth inner turn portion n21 refers to: the side of the fourth inner turn portion n21 away from the area surrounded by the third coil portion 113a on the second surface S2. The fourth outer turn portion n22 and the fourth inner turn portion n21 can be connected or spaced apart. This embodiment and the following embodiments are described on the basis of the fourth outer turn portion n22 and the fourth inner turn portion n21 being spaced apart. In this way, the fourth outer turn portion n22 and the fourth inner turn portion n21 are independent of each other, and the internal currents are separated from each other.

[0159] On the basis of the above, please continue to refer to Fig.13 , one end of the first outer ring portion k12 facing the second outer ring portion k22 is electrically connected to one end of the second inner ring portion k12 facing the first inner ring portion k11. In some embodiments, the two ends are electrically connected by means of a third connection portion a3. The third connection portion a3 is disposed on the first surface S1, and the third connection portion a3 is integrally formed with the first outer ring portion k12 and the second inner ring portion k12. This ensures a neat appearance.

[0160] One end of the third outer ring portion n12 facing the fourth outer ring portion n22 is electrically connected to one end of the first outer ring portion k12 facing the second outer ring portion k22. In some embodiments, the two ends are electrically connected by means of a third metallized via 116. This ensures a neat appearance. The number of the third metallized via 116 can be one or more. Fig.13 In the illustrated embodiment, the number of the third metallized vias 116 is two, which is beneficial for reducing impedance.

[0161] One end of the fourth inner ring portion n21 facing the third inner ring portion n11 is electrically connected to one end of the second inner ring portion k21 facing the first inner ring portion k11. In some embodiments, the two ends are electrically connected by means of a fourth metallized via 117. This ensures a neat appearance. The number of the fourth metallized via 117 can be one or more. Fig.13In the illustrated embodiment, the number of the fourth metallized vias 117 is two, which is beneficial for reducing impedance.

[0162] One end of the third inner ring portion n11 facing the fourth inner ring portion n21 is electrically connected to one end of the fourth outer ring portion n22 facing the third outer ring portion n12. In some embodiments, the two ends are electrically connected by means of a fourth connecting portion a4. The fourth connecting portion a4 is disposed on the second surface S2, and the fourth connecting portion a4 is integrally formed with the third inner ring portion n11 and the fourth outer ring portion n22. This ensures a neat appearance.

[0163] One end of the first inner ring portion k11 facing the second inner ring portion k21 is electrically connected to one end of the third inner ring portion n11 facing the fourth inner ring portion n21. In some embodiments, the two ends are electrically connected by means of a fifth metallized via 118. This ensures a neat appearance. The number of the fifth metallized via 118 can be one or more. Fig.13 In the illustrated embodiment, the number of the fifth metallized vias 118 is two, which is beneficial for reducing impedance.

[0164] One end of the second outer ring portion K22 facing the first outer ring portion K12 is electrically connected to one end of the fourth outer ring portion n22 facing the third outer ring portion n12. In some embodiments, the two ends are electrically connected by means of the sixth metallized via 119. This ensures a neat appearance. The number of the sixth metallized via 119 can be one or more. Fig.13 In the illustrated embodiment, the number of the sixth metallized vias 119 is two, which is beneficial for reducing impedance.

[0165] In this way, a turn of the first coil 112a1 in the first coil part 112a is formed by splicing multiple parts, and a turn of the third coil 113a1 in the third coil part 113a is also formed by splicing multiple parts. And a turn of the first coil 112a1 and a corresponding turn of the third coil 113a1 form an inner and outer cross structure, which can further improve the uneven distribution of current in the inner and outer layers and further reduce impedance.

[0166] On the basis of the above-mentioned embodiment, in order to connect the above-mentioned second coil part 112b, the fourth coil part 113b and at least one first parallel body in series between the first terminal d1 and the second terminal d2, in some embodiments, please refer to Fig. 9 The two ends of the third coil portion 113a are respectively a first end t1 and a second end t2.

[0167] The first end t1 is located on the outermost turn of the third coil 113a1 in the third coil part 113a, and the first end t1 is electrically connected to an end of the fourth coil part 113b facing the third coil part 113a, and an end of the fourth coil part 113b away from the third coil part 113a is electrically connected to the first terminal d1. Specifically, the end of the fourth coil part 113b away from the third coil part 113a can be electrically connected to the first terminal d1 by contact, or can be indirectly electrically connected to the first terminal d1 through other structures.

[0168] The second end t2 is located on the innermost turn of the third coil 113a1 in the third coil part 113a, and is electrically connected to the end of the second coil part 112b facing the first coil part 112a. The end of the second coil part 112b away from the first coil part 112a is electrically connected to the second terminal d2.

[0169] In this way, the second coil part 112b, the fourth coil part 113b and at least one first parallel body are connected in series between the first terminal d1 and the second terminal d2. This structure is simple and easy to implement.

[0170] In the above embodiment, in order to realize the electrical connection between the second end t2 and the end of the second coil portion 112b facing the first coil portion 112a, in some embodiments, please continue to refer to Fig. 9 , the innermost turn of the first coil 112a1 in the first coil part 112a corresponds to the innermost turn of the third coil 113a1, and the end of the innermost turn of the first coil 112a1 electrically connected to the second end t2 is the third end t3. In the circumferential direction of the first coil part 112a, there is a first gap g1 between the two ends of each turn of the first coil 112a1. On this basis, the first coil plate 11 also includes a first connecting portion a1. The first connecting portion a1 is arranged on the first surface S1 and penetrates the first gap g1, one end of the first connecting portion a1 is electrically connected to the third end t3, and the other end is electrically connected to the end of the second coil part 112b facing the first coil part 112a. Therefore, by means of the metallized via between the third end t3 and the second end t2, and the first connecting portion a1, the electrical connection between the second end t2 and the end of the second coil part 112b facing the first coil part 112a is achieved, which can avoid the metal layer of the first surface S1 from crossing and ensure the neat appearance.

[0171] In some embodiments, the first connecting portion a1, the first coil portion 112a and the second coil portion 112b are integrally formed, thereby reducing the difficulty of manufacturing and ensuring a neat appearance.

[0172] See also Fig.12In the first coil module 1, not only the current distribution of the coil less than 1 / 2 of the inner edge is uneven, but also the current distribution of the coil less than 1 / 3 of the outer edge is uneven. Based on this, in order to further reduce the impedance of the first coil plate 11, in some embodiments, please continue to refer to Fig. 9 The first coil layer 112 further includes a fifth coil portion 112c disposed at the periphery of the second coil portion 112b.

[0173] The fifth coil portion 112c includes at least one turn of the fifth coil 112c1. Fig. 9 In the illustrated embodiment, the fifth coil portion 112c includes one turn of the fifth coil 112c1.

[0174] The outermost turn of the fifth coil 112c1 in the fifth coil portion 112c forms the outermost turn of the coil in the first coil layer 112. The outermost turn of the fifth coil 112c1 in the fifth coil portion 112c refers to the turn of the fifth coil 112c1 in the fifth coil portion 112c that is closest to the area surrounded by the first coil layer 112 on the first surface S1. The outermost turn of the coil in the first coil layer 112 refers to the turn of the coil in the first coil layer 112 that is farthest from the area surrounded by the first coil layer 112 on the first surface S1.

[0175] The inner diameter D5 of the fifth coil portion satisfies the condition: (D11+D12) / 3≤D5≤D12.

[0176] The second coil 113 further includes a sixth coil portion 113c disposed at the periphery of the fourth coil portion 113b.

[0177] The sixth coil portion 113c includes at least one turn of the sixth coil 113c1. Fig. 9 In the illustrated embodiment, the sixth coil portion 113c includes one turn of the sixth coil 113c1.

[0178] The outermost turn of the sixth coil 113c1 in the sixth coil portion 113c forms the outermost turn of the coil in the second coil layer 113. The outermost turn of the sixth coil 113c1 in the sixth coil portion 113c refers to the turn of the sixth coil 113c1 in the sixth coil portion 113c that is closest to the area surrounded by the second coil layer 113 on the second surface S2. The outermost turn of the coil in the second coil layer 113 refers to the turn of the coil in the second coil layer 113 that is farthest from the area surrounded by the second coil layer 113 on the second surface S2.

[0179] The inner diameter D6 of the sixth coil portion satisfies the condition: (D21+D22) / 3≤D6≤D22.

[0180] On the basis of the above, at least part of the sixth coil part 113c is connected in parallel with at least part of the fifth coil part 112c to form a second parallel body. Specifically, the two parts forming the second parallel body can be a section of a turn of the sixth coil 113c1 in the sixth coil part 113c and a section of a turn of the fifth coil 112c1 in the fifth coil part 112c, or a turn of the sixth coil 113c1 in the sixth coil part 113c and a turn of the fifth coil 112c1 in the fifth coil part 112c, or multiple turns of the sixth coil 113c1 in the sixth coil part 113c and multiple turns of the fifth coil 112c1 in the fifth coil part 112c, or the entire sixth coil part 113c and the entire fifth coil part 112c. No specific limitation is made here.

[0181] In some embodiments, please refer to Fig. 9 , at least one turn of the fifth coil 112c1 included in the fifth coil part 112c corresponds to at least one turn of the sixth coil 113c1 included in the sixth coil part 113c. Specifically, the at least one turn of the fifth coil 112c1 and the at least one turn of the sixth coil 113c1 can be equal in number and correspond one-to-one, or one turn of the fifth coil 112c1 can correspond to multiple turns of the sixth coil 113c1, or multiple turns of the fifth coil 112c1 correspond to one turn of the sixth coil 113c1, which is not specifically limited here. The following embodiments are introduced on the basis that the at least one turn of the fifth coil 112c1 and the at least one turn of the sixth coil 113c1 are equal in number and correspond one-to-one.

[0182] Each turn of the fifth coil 112c1 is connected in parallel with the corresponding sixth coil 113c1 to form a second parallel body. In some embodiments, two ends of each turn of the fifth coil 112c1 and two ends of the corresponding sixth coil 113c1 can be electrically connected by metallized vias to achieve parallel connection between the two.

[0183] On the basis of the above, the second coil portion 112b, the fourth coil portion 113b, the first parallel body and the second parallel body are connected in series between the first terminal d1 and the second terminal d2.

[0184] In this way, the impedance of the first coil plate 11 can be further reduced, the uneven distribution of the induced current in the first coil plate 11 can be improved, and the charging efficiency can be improved.

[0185] Please continue reading Fig. 9, at least one turn of the fifth coil 112c1 included in the fifth coil part 112c is respectively connected in parallel with at least one turn of the sixth coil 113c1 included in the sixth coil part 113c, so as to form at least one second parallel body. On this basis, the second coil part 112b, the fourth coil part 113b, and the first parallel body can be arranged in series with all the second parallel bodies in the at least one second parallel body, or can be arranged in series with some of the second parallel bodies in the at least one second parallel body, which is not specifically limited here.

[0186] In some embodiments, the second coil portion 112b, the fourth coil portion 113b, the first parallel body and all the second parallel bodies in the at least one second parallel body are arranged in series. That is to say, all the second parallel bodies in the at least one second parallel body are arranged in series, and the second coil portion 112b, the fourth coil portion 113b, the first parallel body and the at least one second parallel body in series are arranged in series.

[0187] In this way, the uneven distribution of coil current can be effectively improved and the impedance can be reduced.

[0188] In the above embodiments, in order to realize the series connection of at least one second parallel body, in some embodiments, please continue to refer to Fig. 9 The at least one turn of the fifth coil 112c1 included in the fifth coil part 112c is disposed separately from each other. That is, the at least one turn of the fifth coil 112c1 is disposed at intervals and does not contact each other.

[0189] On the basis of the above, the at least one turn of the sixth coil 113c1 included in the sixth coil part 113c is electrically connected in sequence from the inside to the outside.

[0190] On the basis of the above, two ends of each turn of the fifth coil 112c1 are electrically connected to two ends of a corresponding turn of the sixth coil 113c1.

[0191] In this way, at least one second parallel body formed by at least one turn of the fifth coil 112c1 and at least one turn of the sixth coil 113c1 is connected in series by means of the connecting part between two adjacent turns of the sixth coil 113c1. This structure is simple and has a neat appearance.

[0192] In some embodiments, please refer to Fig. 9 Each turn of the fifth coil 112c1 and the corresponding turn of the sixth coil 113c1 can also be arranged as Fig.13 The inner and outer cross structure shown is helpful to improve the uneven current distribution in the inner and outer layers and further reduce the impedance.

[0193] In order to connect the second coil portion 112b, the fourth coil portion 113b, the first parallel body and at least one second parallel body in series between the first terminal d1 and the second terminal d2, in some embodiments, please continue to refer to Fig. 9 The two ends of the sixth coil 113c1 are a fourth end t4 and a fifth end t5 respectively.

[0194] The fourth end t4 is located on the innermost turn of the sixth coil 113c1 in the sixth coil portion 113c, and the fourth end t4 is electrically connected to an end of the fourth coil portion 113b away from the third coil portion 113a.

[0195] The fifth end t5 is located on the outermost turn of the sixth coil 113c1 in the sixth coil portion 113c, and the fifth end t5 is electrically connected to the first terminal d1.

[0196] Thus, at least one second parallel body formed by at least one turn of the fifth coil 112c1 and at least one turn of the sixth coil 113c1 is connected in series between the fourth coil portion 113b and the first terminal d1. This structure is simple and easy to implement.

[0197] In the above embodiment, in order to realize the electrical connection between the fifth terminal t5 and the first terminal d1, in some embodiments, please continue to refer to Fig. 9 The outermost turn of the fifth coil 112c1 in the fifth coil portion 112c corresponds to the outermost turn of the sixth coil 113c1, and the end of the outermost turn of the fifth coil 112c1 electrically connected to the fifth end t5 is the sixth end t6. The sixth end t6 is electrically connected to the first terminal d1. In this way, the electrical connection between the fifth end t5 and the sixth end t6 is achieved by means of the metallized via between the fifth end t5 and the sixth end t6. This structure is simple and easy to implement.

[0198] In order to realize the electrical connection between the end of the second coil portion 112b away from the first coil portion 112a and the second terminal d2, in some embodiments, please continue to refer to Fig. 9 , in the circumferential direction of the fifth coil part 112c, there is a second gap g2 between the two ends of each turn of the fifth coil 112c1. On this basis, the first coil plate 11 also includes a fifth connection portion a5. The fifth connection portion a5 is arranged on the first surface S1 and penetrates the second gap g2. One end of the fifth connection portion a5 is electrically connected to the end of the second coil part 112b away from the first coil part 112a, and the other end is electrically connected to the second terminal d2. Thus, the electrical connection between the end of the second coil part 112b away from the first coil part 112a and the second terminal d2 is achieved with the help of the fifth connection portion a5, which can avoid the metal layer of the first surface S1 from crossing, and can ensure the neat appearance.

[0199] In some embodiments, the fifth connecting portion a5, the second coil portion 112b and the second terminal d2 are integrally formed, thereby reducing the difficulty of manufacturing.

[0200] In some embodiments, please refer to Fig. 9 , the first terminal d1 and the second terminal d2 are both located on the first surface S1, and the first terminal d1 and the second terminal d2 are located on the outside of the first coil layer 112. The outside of the first coil layer 112 refers to: the side of the first coil layer 112 away from the area surrounded by the first coil layer 112 on the first surface S1. This structure is simple and has a neat appearance. In other embodiments, the first terminal d1 and the second terminal d2 may also be arranged on the second surface S2, or one is arranged on the first surface S1 and the other is arranged on the second surface S2, which is not specifically limited here.

[0201] A structural form of the first coil plate 11 is introduced above. In the first coil plate 11, the series connection sequence of the second coil portion 112b, the fourth coil portion 113b, the first parallel body and the second parallel body between the first terminal d1 and the second terminal d2 is: first terminal d1→at least one second parallel body→fourth coil portion 113b→at least one first parallel body→second coil portion 112b→second terminal d2. Of course, the series connection sequence of the second coil portion 112b, the fourth coil portion 113b, the first parallel body and the second parallel body between the first terminal d1 and the second terminal d2 can also have other sequences.

[0202] For examples, see Fig.14 , Fig.14 The exploded view of the first coil module 1 provided for some other embodiments of the present application. In this embodiment, at least one turn of the first coil 112a1 included in the first coil part 112a is respectively connected in parallel with at least one turn of the third coil 113a1 included in the third coil part 113a to form at least one first parallel body. The at least one turn of the first coil 112a1 included in the first coil part 112a is arranged separately from each other, and the at least one turn of the third coil 113a1 included in the third coil part 113a is electrically connected in sequence from the inside to the outside, and the two ends of each turn of the first coil 112a1 are respectively electrically connected to the two ends of the corresponding turn of the third coil 113a1. In this way, the series connection of at least one first parallel body is achieved.

[0203] Similarly, at least one turn of the fifth coil 112c1 included in the fifth coil part 112c is respectively connected in parallel with at least one turn of the sixth coil 113c1 included in the sixth coil part 113c to form at least one second parallel body. The at least one turn of the fifth coil 112c1 included in the fifth coil part 112c is arranged separately from each other, and the at least one turn of the sixth coil 113c1 included in the sixth coil part 113c is electrically connected in sequence from the inside to the outside, and the two ends of each turn of the fifth coil 112c1 are respectively electrically connected to the two ends of the corresponding turn of the sixth coil 113c1. In this way, the series connection of at least one second parallel body is achieved.

[0204] On the basis of the above, the two ends of the third coil part 113a are respectively a first end t1 and a second end t2. The first end t1 is located on the outermost turn of the third coil 113a1 in the third coil part 113a, and the first end t1 is electrically connected to the end of the fourth coil part 113b facing the third coil part 113a, the end of the fourth coil part 113b away from the third coil part 113a is electrically connected to the end of the sixth coil part 113c facing the fourth coil part 113b (that is, the fourth end t4), the end of the sixth coil part 113c away from the fourth coil part 113b (that is, the fifth end t5) is electrically connected to the end of the second coil part 112b away from the first coil part 112a, and the end of the second coil part 112b facing the first coil part 112a is electrically connected to the second terminal d2. The second end t2 is located on the innermost turn of the third coil 113a1 in the third coil part 113a, and the second end t2 is electrically connected to the first terminal d1.

[0205] In this way, the series connection order of the second coil part 112b, the fourth coil part 113b, the first parallel body and the second parallel body between the first terminal d1 and the second terminal d2 is: first terminal d1→at least one first parallel body→fourth coil part 113b→at least one second parallel body→second coil part 112b→second terminal d2.

[0206] In the above embodiment, in order to realize the electrical connection between the end of the sixth coil portion 113c away from the fourth coil portion 113b and the end of the second coil portion 112b away from the first coil portion 112a, in some embodiments, please continue to refer to Fig.14, the outermost turn of the fifth coil 112c1 in the fifth coil part 112c corresponds to the outermost turn of the sixth coil 113c1, and the end of the outermost turn of the fifth coil 112c1 electrically connected to the fifth end t5 is the sixth end t6. In the circumferential direction of the fifth coil part 112c, there is a second gap g2 between the two ends of each turn of the fifth coil 112c1. On this basis, the first coil plate 11 also includes a fifth connecting portion a5. The fifth connecting portion a5 is arranged on the first surface S1 and penetrates the second gap g2, one end of the fifth connecting portion a5 is electrically connected to the sixth end t6, and the other end is electrically connected to the end of the second coil part 112b away from the first coil part 112a. Thus, with the help of the metallized via between the fifth end t5 and the sixth end t6 and the fifth connecting portion a5, electrical connection is achieved between the end of the sixth coil portion 113c away from the fourth coil portion 113b and the end of the second coil portion 112b away from the first coil portion 112a, thereby avoiding the intersection of the metal layers on the first surface S1 and ensuring a neat appearance.

[0207] In addition, in order to realize the electrical connection between the end of the second coil part 112b facing the first coil part 112a and the second terminal d2, in some embodiments, in the circumferential direction of the first coil part 112a, there is a first gap g1 between the two ends of each turn of the first coil 112a1. On this basis, the first coil plate 11 also includes a first connecting portion a1. The first connecting portion a1 is arranged on the first surface S1 and penetrates the first gap g1, one end of the first connecting portion a1 is electrically connected to the end of the second coil part 112b facing the first coil part 112a, and the other end is electrically connected to the second terminal d2. Thus, the electrical connection between the end of the second coil part 112b facing the first coil part 112a and the second terminal d2 is realized by means of the first connecting portion a1, which can avoid the metal layer of the first surface S1 from crossing and ensure the neat appearance.

[0208] Furthermore, in order to realize the electrical connection between the second end t2 and the first terminal d1, in some embodiments, the second end t2 is located on the innermost turn of the third coil 113a1 in the third coil part 113a, and the innermost turn of the first coil 112a1 in the first coil part 112a corresponds to the innermost turn of the third coil 113a1, and the end of the innermost turn of the first coil 112a1 electrically connected to the second end t2 is the third end t3. The third end t3 is electrically connected to the first terminal d1. Thus, the electrical connection between the second end t2 and the first terminal d1 is realized by means of the metallized via between the third end t3 and the second end t2. In this way, the first terminal d1 can be set on the first surface S1 for easy processing.

[0209] In some embodiments, please refer to Fig.14The first terminal d1 and the second terminal d2 are both located on the first surface S1, and the first terminal d1 and the second terminal d2 are located on the inner side of the first coil layer 112. The inner side of the first coil layer 112 refers to the side of the first coil layer 112 facing the area on the first surface S1 surrounded by the first coil layer 112. This structure is simple and has a neat appearance.

[0210] In some embodiments, see Fig.15 , Fig.15 for Figure 7 The cross-sectional structure diagram of the first coil module 1 at line AA is shown. In this embodiment, the first coil layer 112 and the second coil layer 113 may include two layers of metal materials. For details, please refer to Fig.15 The first coil layer 112 includes a first metal material layer 1121 and a second metal material layer 1122. The first metal material layer 1121 is disposed on the first surface S1. The second metal material layer 1122 is a plating layer formed on the surface of the first metal material layer 1121 away from the first surface S1 when forming a plated through hole (PTH).

[0211] The second coil layer 113 includes a third metal material layer 1131 and a fourth metal material layer 1132 . The third metal material layer 1131 is disposed on the second surface S2 . The fourth metal material layer 1132 is a plating layer formed on the surface of the third metal material layer 1131 away from the second surface S2 when forming the PTH.

[0212] In other embodiments, the first coil layer 112 and the second coil layer 113 may also be a single layer of metal, or more than three layers of metal, which is not specifically limited herein.

[0213] In some embodiments, please refer to Fig.15 A first protective layer 120a is further provided on the side of the first coil layer 112 facing away from the first coil substrate 111. The first protective layer 120a is an insulating layer. The material of the first protective layer 120a is not limited to at least one of PI, PC, PC+glass fiber, and ABS plastic. The first protective layer 120a is used to protect the first coil layer 112. The color of the first protective layer 120a includes but is not limited to black, white, yellow, etc.

[0214] In some embodiments, a first adhesive layer 110a is further disposed between the first protective layer 120a and the first coil layer 112. The first adhesive layer 110a is used to bond the first protective layer 120a to the first coil layer 112.

[0215] Similarly, please continue to read Fig.15A second protective layer 120b is further provided on the side of the second coil layer 113 facing away from the first coil substrate 111. The second protective layer 120b is an insulating layer. The material of the second protective layer 120b is not limited to at least one of PI, PC, PC+glass fiber, and ABS plastic. The second protective layer 120b is used to protect the second coil layer 113. The color of the second protective layer 120b includes but is not limited to black, white, yellow, etc.

[0216] In some embodiments, a second adhesive layer 110 b is further disposed between the second protective layer 120 b and the second coil layer 113 . The second adhesive layer 110 b is used to bond the second protective layer 120 b to the second coil layer 113 .

[0217] Please refer to Table 1 below, which records the optional materials and optional thicknesses of each layer structure in the first coil plate 11.

[0218] Table 1

[0219]

[0220]

[0221] It should be noted that Table 1 exemplarily illustrates the optional materials and optional thicknesses of the various layers of the first coil plate 11 , which cannot be regarded as a special limitation on the optional materials and optional thicknesses of the various layers of the first coil plate 11 .

[0222] The structure of the first coil plate 11 is described above, and the structure of the second coil plate 12 may be the same as that of the first coil plate 11 .

[0223] For details, please refer to Figure 8 The second coil plate 12 is located on the side of the second surface S2 of the first coil plate 11 facing away from the first surface S1. Fig.16 , Fig.16 for Figure 8 The second coil plate 12 in the first coil module 1 is further exploded. The second coil plate 12 includes a second coil substrate 121 , a third coil layer 122 and a fourth coil layer 123 .

[0224] The second coil substrate 121 is an insulating substrate having rigidity. The second coil substrate 121 includes a third surface S3 and a fourth surface S4 opposite to each other. Figure 8 The third surface S3 is arranged to face away from the first coil plate 11 , and the fourth surface S4 is arranged to face the first coil plate 11 .

[0225] The third coil layer 122 is disposed on the third surface S3, and the structure of the third coil layer 122 is the same as that of the first coil layer 112, which will not be described in detail here. The fourth coil layer 123 is disposed on the fourth surface S4, and the structure of the fourth coil layer 123 is the same as that of the second coil layer 113, which will not be described in detail here. The connection method of the third coil layer 122 and the fourth coil layer 123 is the same as that of the first coil layer 112 and the second coil layer 113, which will not be described in detail here.

[0226] The second coil plate 12 further includes a third terminal d3 and a fourth terminal d4. The third terminal d3 is electrically connected to the second terminal d2, and the fourth terminal d4 forms the second external terminal W2. In this way, the first coil plate 11 and the second coil plate 12 are arranged in series between the first external terminal W1 and the second external terminal W2.

[0227] In the above embodiment, the third terminal d3 and the second terminal d2 may be electrically connected via a welding point, or may be integrally formed. In some embodiments, the third terminal d3 and the second terminal d2 are integrally formed.

[0228] For details, please refer to Fig.16 The second coil substrate 121 includes a second connection portion 121a, and the third terminal d3 is disposed in a region of the third surface S3 located on the second connection portion 121a. Fig. 9 The first coil substrate 111 includes a first connection portion 111a, and the second terminal d2 is disposed in the area of ​​the first surface S1 located on the first connection portion 111a. The second connection portion 121a is connected to the first connection portion 111a and is integrally formed. The third coil layer 122, the third terminal d3, the second terminal d2 and the first coil layer 112 are integrally formed. In this way, Figure 8 The first coil module 1 shown can be formed by folding the first coil module in the unfolded state in half and bonding them together through the adhesive layer 13. Fig.17 , Fig.17 This is a schematic diagram of the structure of the first coil module 1 provided in some embodiments of the present application when it is in an unfolded state. This can reduce the processing difficulty of the first coil module 1 and reduce the production cost.

[0229] In other embodiments, the structure of the second coil plate 12 may also be different from the structure of the first coil plate 11. The first coil module 1 may also not include the second coil plate 12. Alternatively, in addition to the first coil plate 11 and the second coil plate 12, the first coil module 1 also includes a third coil plate, a fourth coil plate, a fifth coil plate, etc. stacked therewith, and the structures of the third coil plate, the fourth coil plate and the fifth coil plate may be the same as the structure of the first coil plate 11, or may be different from the structure of the first coil plate 11, which is not specifically limited here.

[0230] In order to verify the performance of the first coil module 1 provided in the embodiment of the present application, please refer to Fig.18 , Fig.18 for Figure 7 The current simulation diagram of the first coil module 1 is shown in FIG. Fig.18 It can be seen that the current distribution is more uniform, and the simulated AC resistance RAC is 329mΩ. Figure 7 The first coil module 1 shown has the same inner diameter, outer diameter, number of coil layers and number of turns per coil layer, and each coil turn is connected in series with other coils. The AC resistance RAC obtained by simulation is 400mΩ. The loss of the first coil module 1 described in the technical solution of this application is optimized by 17.5%.

[0231] The present application also provides a charger 100A, which is used to charge the above-mentioned electronic device 100.

[0232] See also Figure 19-21 , Fig.19 A three-dimensional diagram of a charger 100A provided in some embodiments of the present application, Fig. 20 for Fig.19 The schematic diagram of the cross-sectional structure of the charger 100A at the CC line is shown. Fig.21 for Fig. 20 The charger 100A is a schematic structural diagram of the charger 100A when charging the electronic device 100. The charger 100A comprises a housing 0 and a second coil module 6, a second magnetic isolation sheet 7 and a second magnet 8 arranged in the housing 0.

[0233] Understandably, Fig.19 and Fig. 20 The schematic diagram shows some components of the charger 100A. The actual shape, size, position and structure of these components are not limited to Fig.19 and Fig. 20 In other embodiments, the charger 100A may further include a voltage conversion unit that converts commercial household alternating current (AC) into an AC voltage with a specific frequency.

[0234] The second coil module 6 is the main body for transmitting electricity, and the second coil module 6 is a wire wound along a circular extension track. The second coil module 6 is used to cooperate with the first coil module 1 in the above-mentioned electronic device 100 for charging. The structural form of the second coil module 6 can be the same as that of the first coil module 1, or it can be different, and no specific limitation is made here.

[0235] The second magnetic shielding sheet 7 is stacked with the second coil module 6, that is, the second magnetic shielding sheet 7 is parallel to the plane where the circular extension track of the wire in the second coil module 6 is located. There may be a gap between the second magnetic shielding sheet 7 and the second coil module 6, or they may be in direct contact. The second magnetic shielding sheet 7 is used as a shielding sheet to shield the leakage magnetic flux or electromagnetic waves on its outer surface, so that the power transmission capability of the second coil module 6 toward the side facing away from the second magnetic shielding sheet 7 is increased.

[0236] The orthographic projection of the second magnet 8 is located in the area surrounded by the coil in the second coil module 6. The plane where the second coil module 6 is located refers to the plane where the annular extension track of the wire in the second coil module 6 is located. The second magnet 8 can be set in the inner hole of the second coil module 6, or in other parts, such as embedded in the shell, which is not specifically limited here.

[0237] The second magnet 8 is used to attract the first magnet 206 to achieve the alignment of the second coil module 6 and the first coil module 1. In order to ensure the magnetic attraction of the second magnet 8, the volume of the second magnet 8 is relatively large and the magnetic field strength is also relatively large. In the electronic device 100, due to the limited internal space, the thickness of the first magnetic isolation sheet 2 tends to be thinner, and the smaller the thickness of the magnetic isolation sheet, the lower the magnetic saturation intensity. When the magnetic field intensity around the magnetic isolation sheet reaches the magnetic saturation intensity, the magnetic isolation sheet will lose its magnetic isolation ability. Based on this, in the process of charging the charger 100A and the small-volume electronic device 100, the first magnetic isolation sheet 2 is easily saturated under the action of the magnetic field of the second magnet 8, causing the first magnetic isolation sheet 2 to lose its magnetic isolation ability.

[0238] In order to avoid the above problems, the structure of the second magnet 8 will be described in detail below.

[0239] See also Fig. 22 and Fig.23 , Fig. 22 A three-dimensional diagram of a second magnet 8 provided in some embodiments of the present application, Fig.23 for Fig. 22 The cross-sectional structure diagram of the second magnet 8 at the DD line is shown. The second magnet 8 includes a central magnet 4 and an outer ring magnet 5. The structural forms of the central magnet 4 and the outer ring magnet 5 include but are not limited to permanent magnets and electromagnets. This embodiment and the following embodiments are exemplified by using the central magnet 4 and the outer ring magnet 5 as permanent magnets, which cannot be regarded as a special limitation on the present application.

[0240] The central magnet 4 has a fifth surface S5 and a sixth surface S6 opposite to each other. Fig.19 and Fig. 20When in the charger 100A, the direction of the fifth surface S5 pointing to the sixth surface S6 is consistent with the direction of the second magnetic isolation sheet 7 pointing to the second coil module 6. In this way, during the charging process, the sixth surface S6 faces the first magnet 206 in the electronic device 100, and the fifth surface S5 faces away from the first magnet 206 in the electronic device 100.

[0241] On the basis of the above, the magnetization direction of the central magnet 4 is parallel to the direction from the fifth surface S5 to the sixth surface S6, that is, the central magnet 4 is magnetized along the height direction of the charger. It can be known that the magnetization direction described in this embodiment and the following embodiments is the direction from the N pole to the S pole, or from the S pole to the N pole. For details, please refer to Fig.23 , one end of the fifth surface S5 can be an S pole, and one end of the sixth surface S6 can be an N pole. In other embodiments, one end of the fifth surface S5 can also be an N pole, and one end of the sixth surface S6 can be an S pole.

[0242] The outer ring magnet 5 is located on the circumferential side of the magnetization direction of the center magnet 4. The outer ring magnet 5 is magnetized from the end away from the center magnet 4 to the end facing the center magnet 4. The magnetic pole of the end of the outer ring magnet 5 facing the center magnet 4 is the same as the magnetic pole of the end of the center magnet 4 where the sixth surface S6 is located. Fig.23 In the illustrated embodiment, the end of the central magnet 4 where the sixth surface S6 is located is an N pole, the end of the outer ring magnet 5 facing the central magnet 4 is also an N pole, and the end of the outer ring magnet 5 away from the central magnet 4 is an S pole.

[0243] In other embodiments, when one end of the fifth surface S5 on the central magnet 4 is an N pole and one end of the sixth surface S6 is an S pole, the end of the outer ring magnet 5 facing the central magnet 4 is also an S pole, and the end of the outer ring magnet 5 away from the central magnet 4 is an N pole.

[0244] In this way, the second magnet 8 can concentrate the direction of the magnetic field, avoid the diffusion of the magnetic field, reduce the influence of the magnetic field on the first magnetic isolation sheet 2, and avoid the first magnetic isolation sheet 2 from being magnetically saturated due to the excessive magnetic field at the location, thereby preventing the first magnetic isolation sheet 2 from losing its magnetic isolation ability. At the same time, the thickness of the first magnetic isolation sheet 2 can be made thinner, leaving more height design space for the first coil module 1, so as to increase the number of layers of the coil plate in the first coil module 1, thereby facilitating increasing the number of turns of the coil and improving the charging efficiency.

[0245] The following is a further explanation of the above technical effects in combination with simulation results. Figure 24-Figure 27 , Fig.24 The magnetic pole distribution and magnetic field distribution diagram of the traditional magnet provided in some embodiments of the present application, specifically, Fig.24 (a) is the magnetic pole distribution diagram of the traditional whole magnet. Fig.24 (b) in the figure is the magnetic field distribution diagram of a traditional magnet. Fig.25 for Fig.21 In the charging system shown, the second magnet 8 in the charger 100A is Fig.24 The conventional structure shown is a magnetic field distribution diagram of the first magnetic isolation plate 2. Fig.26 for Fig.23 Magnetic field distribution diagram of the second magnet 8 is shown. Fig. 27 for Fig.21 In the charging system shown, the second magnet 8 in the charger 100A is Fig.23 The magnetic field distribution diagram of the first magnetic isolation plate 2 in the improved structure shown. Fig.26 and Fig.24 As shown in (b), the magnetic field of the second magnet 8 provided in this application is relatively concentrated. Fig.25 and Fig. 27 As shown, the second magnet 8 provided in the present application is applied to Fig.21 In the charging system shown in the figure, when in the charger 100A, the magnetic field strength of the first magnetic isolation sheet 2 in the electronic device 100 is relatively low, and the possibility of magnetic saturation is relatively small.

[0246] Moreover, in addition to the above-mentioned technical effects, the second magnet 8 of the present application has the same magnetic pole as the end of the outer ring magnet 5 facing the center magnet 4, and the sixth surface S6 is a magnetic field enhancement surface. On this basis, since the sixth surface S6 faces the magnet in the charger, the magnetic attraction between the magnet 206 and the magnet in the charger can be enhanced to ensure positioning accuracy.

[0247] In the above embodiment, the central magnet 4 may be a whole magnet, or may include a plurality of magnet units stacked along the Z-axis direction. Fig.23 In the illustrated embodiment, the central magnet 4 is a whole magnet, and this structure is simple and easy to implement.

[0248] In other embodiments, see Fig.28 and Fig.29 , Fig.28 A three-dimensional diagram of the central magnet 4 provided in some other embodiments of the present application, Fig.29 for Fig.28 The magnetic pole distribution diagram of the central magnet 4 is shown. In this embodiment, the central magnet 4 includes two first magnet units 41 stacked along the Z-axis direction, and the magnetization directions of the two first magnet units 41 are the same. In this way, the processing difficulty of the central magnet 4 can be reduced.

[0249] exist Fig. 22In the embodiment shown, there are multiple outer ring magnets 5, and multiple outer ring magnets 5 are arranged around the circumference of the magnetization direction of the central magnet 4. This structure is simple and the molding difficulty of the outer ring magnets 5 is relatively low. Specifically, the number of the outer ring magnets 5 can be Fig. 22 The 6 shown can also be Fig.30 The 2 shown, Fig.31 The 3 shown, Fig.32 4 shown and so on.

[0250] In other embodiments, see Fig.33 , Fig.33 The third embodiment is a three-dimensional diagram of the second magnet 8 provided in some embodiments of the present application. In this embodiment, the outer ring magnet 5 can also be a ring magnet arranged around the central magnet 4. This structure is simple and the assembly difficulty is relatively low.

[0251] On the basis of the outer ring magnets 5 described in any of the above embodiments, each outer ring magnet 5 may be a structural entity, or may include magnet units stacked along the Z-axis direction.

[0252] In some embodiments, see Fig.34 , Fig.34 A three-dimensional diagram of the second magnet 8 provided in some other embodiments of the present application. In this embodiment, each outer ring magnet 5 includes two second magnet units 51 stacked along the Z-axis direction. The magnetization directions of the two second magnet units 51 are the same. In this way, the processing difficulty of the outer ring magnet 5 can be reduced.

[0253] In the above embodiment, the second magnet 8 as a whole and the central magnet 4 in the second magnet 8 are both roughly cylindrical, and the outer ring magnet 5 is arc-shaped or annular. Of course, the second magnet 8 and the central magnet 4 and the outer ring magnet 5 are not limited to this shape. For example, please refer to Fig.35 , Fig.35 Six stereograms of the second magnet 8 provided in some embodiments of the present application. The entire second magnet 8 and the central magnet 4 in the second magnet 8 may also be Fig.35 The hexagonal shape shown in (a) Fig.35 The triangular prism shown in (b) or Fig.35 Alternatively, the second magnet 8 is cylindrical in shape, while the central magnet 4 in the second magnet 8 is in another shape. For example, please refer to Fig.35 In (d), (e) and (f), the second magnet 8 is cylindrical as a whole, and the central magnet 4 in the second magnet 8 is in the shape of a cubic column, a hexagonal column and a triangular column respectively.

[0254] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0255] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An electronic device, It is characterized in that include: A first coil module for wireless charging, wherein the first coil module comprises a first coil plate, wherein: The first coil plate comprises: a first terminal and a second terminal; a first coil substrate, the first coil substrate comprising a first surface and a second surface facing each other; a first coil layer, the first coil layer being disposed on the first surface, the first coil layer comprising a first coil portion and a second coil portion disposed on the periphery of the first coil portion, the first coil portion comprising at least one turn of a first coil, the innermost turn of the first coil in the first coil portion being the innermost turn of the coil in the first coil layer; A second coil layer, the second coil layer is arranged on the second surface, the second coil layer includes a third coil part and a fourth coil part arranged on the periphery of the third coil part, the third coil part includes at least one turn of the third coil, the innermost turn of the third coil in the third coil part is the innermost turn of the coil in the second coil layer, at least part of the third coil part is connected in parallel with at least part of the first coil part to form a first parallel body, and the second coil part, the fourth coil part and the first parallel body are connected in series between the first terminal and the second terminal.

2. The electronic device according to claim 1, It is characterized in that The inner diameter of the first coil layer is D11, the outer diameter of the first coil layer is D12, and the outer diameter D1 of the first coil part satisfies the condition: D11≤D1≤(D11+D12) / 2; the inner diameter of the second coil layer is D21, the outer diameter of the second coil layer is D22, and the outer diameter D3 of the third coil part satisfies the condition: D21≤D3≤(D21+D22) / 2.

3. The electronic device according to claim 1 or 2, It is characterized in that The number of the at least one turn of the first coil and the at least one turn of the third coil are equal and correspond one to one, and each turn of the first coil is connected in parallel with a corresponding turn of the third coil to form the first parallel body.

4. The electronic device according to claim 3, It is characterized in that The at least one turn of the first coil is arranged separately from each other; The at least one turn of the third coil is electrically connected in sequence from the inside to the outside, and the two ends of each turn of the first coil are electrically connected to the two ends of the corresponding turn of the third coil respectively.

5. The electronic device according to claim 3, It is characterized in that The first coil part includes a first turn of the first coil, and the third coil part includes a second turn of the third coil; wherein, The first turn of the first coil includes a first coil segment and a second coil segment, and the first coil segment and the second coil segment are arranged along the circumference of the first turn of the first coil; wherein, The first coil segment includes a first inner ring portion and a first outer ring portion, wherein the first outer ring portion is located outside the first inner ring portion; The second coil segment includes a second inner ring portion and a second outer ring portion, and the second outer ring portion is located outside the second inner ring portion; The second turn of the third coil includes a third coil segment and a fourth coil segment, the third coil segment corresponds to the first coil segment, and the fourth coil segment corresponds to the second coil segment; wherein, The third coil segment includes a third inner ring portion and a third outer ring portion, wherein the third outer ring portion is located outside the third inner ring portion; The fourth coil segment includes a fourth inner ring portion and a fourth outer ring portion, wherein the fourth outer ring portion is located outside the fourth inner ring portion; One end of the first outer ring portion facing the second outer ring portion is electrically connected to one end of the second inner ring portion facing the first inner ring portion, one end of the third outer ring portion facing the fourth outer ring portion is electrically connected to one end of the first outer ring portion facing the second outer ring portion, and one end of the fourth inner ring portion facing the third inner ring portion is electrically connected to one end of the second inner ring portion facing the first inner ring portion; One end of the third inner ring portion facing the fourth inner ring portion is electrically connected to one end of the fourth outer ring portion facing the third outer ring portion, one end of the first inner ring portion facing the second inner ring portion is electrically connected to one end of the third inner ring portion facing the fourth inner ring portion, and one end of the second outer ring portion facing the first outer ring portion is electrically connected to one end of the fourth outer ring portion facing the third outer ring portion.

6. The electronic device according to claim 1 or 2, It is characterized in that The first coil layer further includes a fifth coil portion disposed at the periphery of the second coil portion, the fifth coil portion includes at least one turn of a fifth coil, and the outermost turn of the fifth coil in the fifth coil portion forms the outermost turn of the coil in the first coil layer; The second coil further includes a sixth coil portion disposed at the periphery of the fourth coil portion, the sixth coil portion including at least one turn of the sixth coil, and the outermost turn of the sixth coil in the sixth coil portion forms the outermost turn of the coil in the second coil layer; At least part of the sixth coil portion is connected in parallel with at least part of the fifth coil portion to form a second parallel body, and the second coil portion, the fourth coil portion, the first parallel body and the second parallel body are arranged in series; The inner diameter D5 of the fifth coil portion satisfies the condition: (D11+D12) / 3≤D5≤D12; the inner diameter D6 of the sixth coil portion satisfies the condition: (D21+D22) / 3≤D6≤D22.

7. The electronic device according to claim 6, It is characterized in that The number of the at least one turn of the fifth coil and the at least one turn of the sixth coil are equal and correspond one to one, and each turn of the fifth coil is connected in parallel with a corresponding turn of the sixth coil to form the second parallel body.

8. The electronic device according to any one of claims 1 to 7, It is characterized in that The first coil module further includes: The second coil plate is stacked with the first coil plate, and the second coil plate includes a third terminal and a fourth terminal, and the third terminal is electrically connected to the second terminal.

9. The electronic device according to any one of claims 1 to 8, It is characterized in that The electronic device further comprises: The first magnetic isolation sheet is located at one side of the first coil module and is stacked with the first coil module.

10. A wireless charging system, It is characterized in that include: An electrical device, wherein the electrical device is the electronic device according to any one of claims 1 to 9; A charger comprising a second coil module and A second magnet, wherein an orthographic projection of the second magnet on the plane where the second coil module is located is located in an area surrounded by the coil in the second coil module.

Images