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

Electronic device and wireless charging system

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on December 20, 2022, with application number 202211641708.6 and invention name “An electronic device and wireless charging system”, the entire contents of which are incorporated by reference into this application. 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 devices. During the power transmission process, no charging cable is required, so it has the advantage of being easy to use.

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

[0005] However, in some electronic devices, such as small electronic devices, due to limited internal space, increasing the number of coil turns will increase the coil's volume, making it difficult to install within the electronic device. Electronic devices can be chargers or power-consuming devices. Therefore, in these electronic devices, it is difficult to further increase the number of coil turns. Based on this, how to improve wireless charging efficiency within the constraints of coil size is currently an important research direction for various manufacturers.

[0006] Summary of the Invention

[0007] The present application provides an electronic device and a wireless charging system for solving 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.

[0008] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0009] In a first aspect, an electronic device is provided, 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.

[0010] The first coil substrate includes a first surface and a second surface facing each other.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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 meets 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 meets the condition: D21≤D3≤(D21+D22) / 2.

[0015] This reduces the impedance of the first coil plate, improves the uneven distribution of the induced current within the first coil plate, reduces losses in the first coil plate, achieves an optimal Q value, and improves wireless charging efficiency. Furthermore, the second and fourth coil sections are connected in series with the first parallel body, and the second and fourth coil sections are not connected in parallel. This allows the number of turns of the coil connected in series between the first and second terminals to be kept within a relatively large range, thereby ensuring the mutual inductance between the first coil module and the charging coil, and thus ensuring wireless charging efficiency.

[0016] In one 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 portion, the fourth coil portion, and the at least one first parallel body are connected in series between the first terminal and the second terminal. This effectively improves uneven current distribution in the coils and reduces impedance, while also maintaining the number of turns of the coils connected in series between the first and second terminals within a relatively large range, thereby improving charging efficiency.

[0017] In a possible implementation of the first aspect, the number of at least one first coil turn and at least one third coil turn is equal and corresponds one to one, and each first coil turn is connected in parallel with a corresponding third coil turn to form a first parallel body. This structure is simple and convenient for alignment.

[0018] In one possible implementation of the first aspect, at least one first coil turn is disposed separately from one another. The at least one third coil turn is electrically connected sequentially from the inside out, with the two ends of each first coil turn being electrically connected to the two ends of a corresponding third coil turn. In this manner, the at least one first parallel body formed by the at least one first coil turn and the at least one third coil turn is connected in series by means of the second connecting portion between two adjacent third coil turns. This structure is simple and has a neat appearance.

[0019] In one possible implementation of the first aspect, the third coil portion comprises a first end and a second end, respectively. The first end is located on the outermost turn of the third coil within the third coil portion, and is electrically connected to the end of the fourth coil portion facing the third coil portion, while the end of the fourth coil portion facing away from the third coil portion is electrically connected to the first terminal. The second end is located on the innermost turn of the third coil within the third coil portion, and is electrically connected to the end of the second coil portion facing the first coil portion, while the end of the second coil portion facing away from the first coil portion is electrically connected to the second terminal. In this way, the second coil portion, the fourth coil portion, and the at least one first parallel body are connected in series between the first and second terminals. This structure is simple and easy to implement.

[0020] 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 of the first surface from crossing and ensure the neat appearance.

[0021] 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 and second coil segments are arranged circumferentially around the first turn of the first coil. The first coil segment includes a first inner turn portion and a first outer turn portion, with the first outer turn portion located outside the first inner turn portion. The second coil segment includes a second inner turn portion and a second outer turn portion, with the second outer turn portion located outside the second inner turn portion. The second turn of the third coil includes a third coil segment and a fourth coil segment, with the third coil segment corresponding to the first coil segment, and the fourth coil segment corresponding to the second coil segment. The third coil segment includes a third inner turn portion and a third outer turn portion, with the third outer turn portion located outside the third inner turn portion. The fourth coil segment includes a fourth inner turn portion and a fourth outer turn portion, with the fourth outer turn portion located outside the fourth inner turn portion. The end of the first outer ring portion facing the second outer ring portion is electrically connected to the end of the second inner ring portion facing the first inner ring portion. The end of the third outer ring portion facing the fourth outer ring portion is electrically connected to the end of the first outer ring portion facing the second outer ring portion. The end of the fourth inner ring portion facing the third inner ring portion is electrically connected to the end of the second inner ring portion facing the first inner ring portion. The end of the third inner ring portion facing the fourth inner ring portion is electrically connected to the end of the fourth outer ring portion facing the third outer ring portion. The end of the first inner ring portion facing the second inner ring portion is electrically connected to the end of the third inner ring portion facing the fourth inner ring portion. The end of the second outer ring portion facing the first outer ring portion is electrically connected to the end of the fourth outer ring portion facing the third outer ring portion. In this way, a single turn of the first coil within the first coil portion is formed by splicing together multiple parts, and a single turn of the third coil within the third coil portion is also formed by splicing together multiple parts. Furthermore, a single turn of the first coil and a corresponding single turn of the third coil form an inner-outer cross structure, which can further improve the uneven current distribution between the inner and outer layers and further reduce impedance.

[0022] In one possible implementation of the first aspect, the first coil layer further includes a fifth coil portion disposed outside the second coil portion. The fifth coil portion includes at least one turn of a fifth coil, with the outermost turn of the fifth coil within the fifth coil portion forming the outermost turn of the coil within the first coil layer. The second coil further includes a sixth coil portion disposed outside the fourth coil portion. The sixth coil portion includes at least one turn of a sixth coil, with the outermost turn of the sixth coil within the sixth coil portion forming the outermost turn of the coil within the second coil layer. At least a portion of the sixth coil portion is connected in parallel with at least a portion of the fifth coil portion to form a second parallel body. 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; and the inner diameter D6 of the sixth coil portion satisfies the condition: (D21 + D22) / 3 ≤ D6 ≤ D22. This further reduces the impedance of the first coil plate, improves the uneven distribution of the induced current within the first coil plate, and enhances charging efficiency.

[0023] In one 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 the at least one second parallel body are connected in series between the first terminal and the second terminal. This effectively improves uneven current distribution in the coils and reduces impedance.

[0024] In a possible implementation of the first aspect, the number of at least one fifth coil and at least one sixth coil is equal and corresponds one to one, and each fifth coil is connected in parallel with a corresponding sixth coil to form a second parallel body. This structure is simple and convenient for alignment.

[0025] In one possible implementation of the first aspect, the at least one fifth coil is disposed separately from one another. The at least one sixth coil is electrically connected sequentially from the inside out, with the two ends of each fifth coil being electrically connected to the two ends of a corresponding sixth coil. In this manner, the at least one second parallel body formed by the at least one fifth coil and the at least one sixth coil is connected in series via the connection between two adjacent sixth coils. This structure is simple and has a neat appearance.

[0026] In one possible implementation of the first aspect, the sixth coil portion comprises a fourth end and a fifth end, respectively. The fourth end is located on the innermost turn of the sixth coil within the sixth coil portion and is electrically connected to an end of the fourth coil portion distal from the third coil portion. The fifth end is located on the outermost turn of the sixth coil within the sixth coil portion and 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 portion and the first terminal. This structure is simple and easy to implement.

[0027] In a possible implementation manner of the first aspect, the first terminal and the second terminal are provided on the first surface and are located outside the first coil layer.

[0028] In a possible implementation of the first aspect, the first terminal and the second terminal are provided on the first surface and located on an inner side of the first coil layer.

[0029] In one possible implementation of the first aspect, the first coil module further includes a second coil plate, the second coil plate being stacked on the first coil plate, the second coil plate including a third terminal and a fourth terminal, the third terminal being electrically connected to the second terminal. This increases the number of coil turns within the first coil module, thereby improving mutual inductance and charging efficiency.

[0030] In a possible implementation 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 solder joint.

[0031] In one possible implementation of the first aspect, the electronic device further includes a first magnetic isolation sheet, located on one side of the first coil module and stacked with the first coil module. The first magnetic isolation sheet is configured to prevent the metal conductor on one side of the first coil module from causing attenuation of the charging magnetic field, thereby providing metal isolation, preventing energy waste, and improving charging efficiency.

[0032] 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 alloy.

[0033] In one possible implementation of the first aspect, the electronic device further includes a first magnet, wherein an orthographic projection of the first magnet on the first coil plate is located within an area surrounded by the first coil layer and the second coil layer. The first magnet is configured to engage with a magnet within the charger to achieve alignment between the first coil module and the charging coil within the charger.

[0034] In a second aspect, a charging system is provided, comprising an electrical device and a charger. The electrical device is an electronic device as described in any of the above technical solutions. The charger includes a second coil module, which is configured to cooperate with the first coil module for charging.

[0035] 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.

[0036] In a possible implementation of the second aspect, the charger further includes a second magnetic isolation sheet. The second magnetic isolation sheet is located on one side of the second coil module and is stacked with the second coil module.

[0037] In a possible implementation of the second aspect, the charger further includes a second magnet, wherein an orthographic projection of the second magnet on the plane where the second coil module is located is located within an area surrounded by the coil in the second coil module.

[0038] In one possible implementation of the second aspect, the second magnet includes a central magnet and an outer ring magnet. The central magnet has opposing fifth and sixth surfaces, with the direction of the fifth surface pointing toward the sixth surface being consistent with the direction of the first magnetic shielding plate pointing toward the first coil module. The magnetization direction of the central magnet is parallel to the direction of the fifth surface pointing toward the sixth surface. The outer ring magnet is located circumferentially to the magnetization direction of the central magnet. The outer ring magnet is magnetized from the end away from the central magnet to the 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 of the central magnet where the sixth surface is located. In this way, the second magnet can concentrate the direction of the magnetic field, prevent magnetic field diffusion, reduce the impact of the magnetic field on the first magnetic shielding plate, and prevent the first magnetic shielding plate from becoming magnetically saturated due to an excessively large magnetic field at its location, thereby preventing the first magnetic shielding plate from losing its magnetic shielding ability. At the same time, the thickness of the first magnetic shielding plate can be reduced, reserving more height design space for the first coil module in the electronic device, thereby increasing the number of coil plate layers within the first coil module, thereby increasing the number of coil turns, 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 inside the charger, the magnetic attraction between the magnet and the magnet inside the charger can be enhanced to ensure positioning accuracy.

[0039] In a possible implementation of the second aspect, there are multiple outer ring magnets, which are evenly arranged around the central magnet in the magnetization direction. This structure is simple and the outer ring magnets are relatively easy to form. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] FIG1 is a schematic structural diagram of a wireless charging system provided by some embodiments of the present application;

[0041] FIG2 is a schematic diagram of the structure of an electronic device provided in some embodiments of the present application;

[0042] FIG3 is an exploded view of the watch body in the electronic device shown in FIG2 ;

[0043] FIG4 is a perspective view of the charging assembly in the watch body shown in FIG3 ;

[0044] FIG5 is an exploded view of the charging assembly shown in FIG4 ;

[0045] FIG6 is a partial circuit block diagram of the electronic device shown in FIG3 ;

[0046] FIG7 is a perspective view of the first coil module in the charging assembly shown in FIG5 ;

[0047] FIG8 is an exploded view of the first coil module shown in FIG7 ;

[0048] FIG9 is a further exploded view of the first coil plate in the first coil module shown in FIG8 ;

[0049] FIG10 is a schematic structural diagram of a first coil module provided by the related art;

[0050] FIG11 is a schematic diagram of the cross-sectional structure of the first coil module shown in FIG10 taken along line BB;

[0051] FIG12 is a diagram illustrating the electric field distribution of the first coil layer, the second coil layer, the third coil layer, and the fourth coil layer in the first coil module shown in FIG11 during the charging process;

[0052] FIG13 is a schematic diagram of an electrical connection path between the first turn of the first coil and the second turn of the third coil in the first coil module shown in FIG9 ;

[0053] FIG14 is an exploded view of a first coil module provided in some other embodiments of the present application;

[0054] FIG15 is a schematic diagram of the cross-sectional structure of the first coil module shown in FIG7 at line AA;

[0055] FIG16 is a further exploded view of the second coil plate in the first coil module shown in FIG8 ;

[0056] FIG17 is a schematic structural diagram of a first coil module in an expanded state provided by some embodiments of the present application;

[0057] FIG18 is a current simulation diagram of the first coil module shown in FIG7 ;

[0058] FIG19 is a perspective view of a charger provided in some embodiments of the present application;

[0059] FIG20 is a schematic diagram of the cross-sectional structure of the charger shown in FIG19 at line CC;

[0060] FIG21 is a schematic structural diagram of the charger shown in FIG20 when charging an electronic device;

[0061] FIG22 is a perspective view of a second magnet provided in some embodiments of the present application;

[0062] FIG23 is a schematic diagram of the cross-sectional structure of the second magnet shown in FIG22 at line DD;

[0063] FIG24 is a diagram showing the magnetic pole distribution and magnetic field distribution of a conventional magnet provided in some embodiments of the present application;

[0064] FIG25 is a diagram showing the magnetic field distribution of the first magnetic isolation sheet when the second magnet in the charger of the charging system shown in FIG21 is the conventional structure shown in FIG24;

[0065] FIG26 is a diagram showing the magnetic field distribution of the second magnet shown in FIG23;

[0066] FIG27 is a diagram showing the magnetic field distribution of the first magnetic isolation sheet when the second magnet in the charger of the charging system shown in FIG21 is the improved structure shown in FIG23;

[0067] FIG28 is a perspective view of a central magnet provided in some other embodiments of the present application;

[0068] FIG29 is a diagram showing the magnetic pole distribution of the central magnet shown in FIG28;

[0069] FIG30 is a perspective view of a second magnet provided in some other embodiments of the present application;

[0070] FIG31 is a perspective view of a second magnet provided in some other embodiments of the present application;

[0071] FIG32 is a perspective view of a second magnet provided in some other embodiments of the present application;

[0072] FIG33 is a perspective view of a second magnet provided in some other embodiments of the present application;

[0073] FIG34 is a perspective view of a second magnet provided in some other embodiments of the present application;

[0074] FIG35 is a three-dimensional diagram of six second magnets provided in some other embodiments of the present application. DETAILED DESCRIPTION

[0075] 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 technical features indicated. Therefore, a feature specified as "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of the features.

[0076] In the embodiments of the present application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0077] In the embodiments of the present application, it should be noted that the description "parallel" means approximately parallel within a certain error range, which can be a range of a deviation angle of less than or equal to 5° relative to absolute parallelism. The description of "aligned" in direction means approximately aligned within a certain error range, which can be a range of a deviation angle of less than or equal to 5° relative to absolute alignment.

[0078] The wireless charging process requires a transmitter and a receiver. Please refer to Figure 1, which is a schematic diagram of the structure of a wireless charging system provided in some embodiments of the present application. The wireless charging system includes a charger 100A and a powered device 100B. Charger 100A is the transmitter, and powered device 100B is the receiver. Charger 100A has a built-in charging coil TX, and powered device 100B has a built-in receiving coil RX.

[0079] During the charging process, referring to FIG. 1 , the plane where the charging coil TX is located is parallel to the plane where the 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 receiving coil RX.

[0080] When an alternating current I1 flows through the charging coil TX, an alternating magnetic field H is generated around the charging coil TX. The magnetic flux lines of this 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 I2 is induced in the receiving coil RX, thereby achieving wireless power transmission. This charging method does not require a charging cable, making it convenient, safe, and reliable.

[0081] 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. Where 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.

[0082] However, in some electronic devices, such as small electronic devices, due to limited internal space, increasing the number of turns in the internal coil increases the coil's footprint, making it difficult to install within the electronic device. Therefore, in these electronic devices, it is difficult to further increase the number of turns in the coil. The electronic device can be either the charger 100A or the power-consuming device 100B.

[0083] In order to solve the above technical problems, the present application provides an electronic device, which can be the charger 100A or the power-consuming device 100B. The following embodiments are exemplified by taking the electronic device as the power-consuming device 100B.

[0084] Specifically, when the electronic device is the aforementioned power-consuming device 100B, the electronic device includes, but is not limited to, a mobile phone, a tablet personal computer, a laptop computer, a personal digital assistant (PDA), a personal computer, a notebook computer, a wearable device, a walkman, a radio, and the like. Among these, wearable devices include, but are not limited to, smart watches, smart bracelets, smart clothing, smart glasses, and smart headphones. The following embodiments are illustrative of the electronic device as a smart watch.

[0085] Please refer to Figure 2, which is a schematic diagram of the structure of an electronic device 100 provided in some embodiments of the present application. Electronic device 100 includes a watch body 20 and a watch strap 10. Watch body 20 is used to implement the main functions of the smart watch, and watch strap 10 is used to wear watch body 20 on a person's wrist.

[0086] In some embodiments, referring again to FIG. 2 , the watchband 10 may include a first strap portion 101 and a second strap portion 102. One end of the first strap portion 101 and one end of the second strap 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 strap portion 101, and a second locking portion 1021 is provided at the other end of the second strap portion 102. The first locking portion 1011 and the second locking portion 1021 are detachably locked to each other to allow the watch body 20 to be worn on a person's wrist.

[0087] Among them, the matching structure composed of the first locking part 1011 and the second locking part 1021 can be a watch buckle structure such as a hook buckle, a hidden buckle, a butterfly buckle, a belt snap buckle, a folding safety buckle, a folding buckle or a pin buckle, and this application does not make specific limitations on this.

[0088] The following mainly introduces the watch body 20.

[0089] Continuing with Figure 2, the watch body 20 is generally disc-shaped. To facilitate the description of the various embodiments below, an XYZ coordinate system is established for the watch body 20 described in this embodiment and the following embodiments. Specifically, the thickness direction of the watch body 20 is defined as the Z-axis, and the plane perpendicular to the Z-axis is defined as the XY plane. The location on the watch body 20 for connecting to the first strap portion 101 is defined as the first location A, and the location on the watch body 20 for connecting to the second strap portion 102 is defined as the second location B. The first location A and the second location B are located within the XY plane. Based on this, the direction of the first location A and the second location B is defined as the X-axis, and the direction perpendicular to the X-axis within the XY plane is defined as the Y-axis. It is understood that the coordinate system configuration of the watch body 20 can be flexibly configured based on actual needs and is not specifically limited here. In other embodiments, the watch body 20 may also be generally disc-shaped, such as an elliptical disc, a triangular disc, a polygonal disc, or a rectangular disc, which are not specifically limited here.

[0090] Please refer to Figures 2 and 3 together. Figure 3 is an exploded view of the watch body 20 in the electronic device 100 shown in Figure 2. The watch body 20 includes a watch body 201, a screen 202, an upper case 203, a lower case 204, a battery (not shown in Figure 3), a charging assembly 205, a first magnet 206, and a circuit board assembly 207.

[0091] It should be understood that Figures 2 and 3 schematically illustrate some components of the watch body 20, and the actual shape, size, position, and structure of these components are not limited by Figures 2 and 3. In other embodiments, the watch body 20 may further include detection devices such as electrocardiogram (ECG) electrodes and a photoplethysmograph (PPG).

[0092] The watch body 201 is the 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 material of the watch body 201 can be stainless steel to ensure the structural strength of the watch body 201 and the support strength for other components.

[0093] 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 form the housing of the watch body 20. The interior of the housing forms a storage space within which the battery, charging assembly 205, first magnet 206, and circuit board assembly 207 are housed.

[0094] 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).

[0095] The material of the lower case 204 can be a non-metallic material to allow the charging component 205 to receive electricity from the outside of the lower case 204. The outside of the lower case 204 refers to the side of the lower case 204 facing away from the accommodating space.

[0096] The screen 202 is fixed to the upper case 203. The screen 202 is used to display hour hand, minute hand, second hand, dial, digital time, weather, temperature, ECG signal, human body temperature, heart rate, body fat, voltage and other numerical values ​​or graphics.

[0097] 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 power electronic components such as the screen 202 and the circuit board assembly 207, and is also used to store electricity from the charging assembly 205.

[0098] The charging assembly 205 utilizes the principle of electromagnetic induction to receive electricity from the charger and stores the received electricity in the battery. In other embodiments, when the electronic device 100 is a charger, the charging assembly 205 is also used to transmit electricity to the power-consuming device.

[0099] Please refer to FIG. 4 and FIG. 5 . FIG. 4 is a three-dimensional view of the charging assembly 205 in the watch body 20 shown in FIG. 3 , and FIG. 5 is an exploded view of the charging assembly 205 shown in FIG. 4 .

[0100] The charging assembly 205 includes a first coil module 1 , a first magnetic isolation sheet 2 and a reinforcement plate 3 .

[0101] The first coil module 1 is the main body that receives power. It is a wire wound along a circular extension path. In some embodiments, when the charging assembly 205 is used in the electronic device 100 shown in Figure 3, the first coil module 1 is stacked with the bottom plate of the lower case 204. That is, the plane of the circular extension path of the wire in the first coil module 1 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 farthest from the screen 202. There can be a gap between the first coil module 1 and the bottom plate of the lower case 204, or they can be in direct contact. This allows the first coil module 1 to receive power from the outside of the lower case 204. In other embodiments, when the charging assembly 205 is used in the electronic device 100 shown in Figure 3, 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, respectively. The outer side of the screen 202 refers to the side of the screen 202 facing away from the accommodation space. The outer side of the upper case 203 refers to the side of the upper case 203 facing away from the accommodation space.

[0102] Please refer to Figures 4 and 5. The first magnetic isolation sheet 2 is stacked with the first coil module 1, that is, the first magnetic isolation sheet 2 is parallel to the plane where the circular extension trajectory of the wire in the first coil module 1 is located. There can be a gap between the first magnetic isolation sheet 2 and the first coil module 1, or they can be in direct contact. When the charging component 205 is applied to the electronic device 100 shown in Figure 3, the first magnetic isolation sheet 2 can be located on the side of the first coil module 1 that is 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 that is 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.

[0103] The first magnetic barrier sheet 2 may include a soft magnetic material. The relative magnetic permeability of the material of the first magnetic barrier sheet may be greater than or equal to 100. For example, the first magnetic barrier sheet 2 may include at least one of ferrite, nanocrystalline, and amorphous. The first magnetic barrier sheet 2 may also include other soft magnetic materials, for example, the first magnetic barrier sheet 2 may include at least one of 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).

[0104] In some embodiments, please refer to FIG. 3 and FIG. 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.

[0105] In some embodiments, as shown in FIG5 , 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 disposed in the first coil module 1, and the conductive wires within the first coil module 1 are disposed around the first inner hole portion h1. The second inner hole portion h2 is connected to the first inner hole portion h1 and is disposed on the first magnetic isolation plate 2.

[0106] Referring to Figures 4 and 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 disposed at two ends of the first coil module 1. The first external terminal W1 and the second external terminal W2 are configured to electrically connect to the circuit board assembly 207 in Figure 3 to transmit the alternating current induced by the first coil module 1 to the circuit board assembly 207.

[0107] Based on 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 facilitate the electrical connection between the first external terminal W1, the second external terminal W2 and the circuit board assembly 207 through spring contact, elastic pin contact and flat metal contact. The material of the reinforcing plate 3 can include at least one of polyimide (PI), PC, PC+glass fiber, and ABS plastic.

[0108] In some embodiments, referring to Figures 4 and 5 , the first magnetic barrier sheet 2 is provided with a notch C, and the reinforcing plate 3 is disposed within the notch C. This prevents the first magnetic barrier sheet 2 and the reinforcing plate 3 from overlapping in thickness along the Z-axis, thereby facilitating a thinner charging assembly 205.

[0109] 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.

[0110] 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.

[0111] In some embodiments, referring back to FIG3 , 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.

[0112] Referring back to Figure 3 , the circuit board assembly 207 serves as the computational control processing center within the electronic device 100 . Please refer to Figure 6 , which is a partial circuit block diagram of the electronic device 100 shown in Figure 3 . The circuit board assembly 207 includes a power receiving chip 2071 , a charge 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 AC power received by the first coil module 1 into DC power, which is then stored in the battery 208 with the aid of the charge 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 control unit (MCU).

[0113] The following focuses on the introduction of the first coil module 1 in the above embodiment.

[0114] 7 and 8, FIG7 is a perspective view of the first coil module 1 in the charging assembly 205 shown in FIG5, and FIG8 is an exploded view of the first coil module 1 shown in FIG7. In this embodiment, the first external terminal W1 and the second external terminal W2 are in a flattened state.

[0115] The first coil module 1 includes a stacked first coil plate 11 and a second coil plate 12. The first coil plate 11 and the second coil plate 12 are connected in series between a first external terminal W1 and a second external terminal W2.

[0116] A glue layer 13 is provided between the first coil plate 11 and the second coil plate 12 to securely connect the first coil plate 11 and the second coil plate 12. The glue layer 13 may be made of materials including, but not limited to, glue, double-sided tape, and 502 glue.

[0117] The following focuses on the first coil plate 11.

[0118] Please refer to Figure 9, which is a further exploded view of the first coil plate 11 in the first coil module 1 shown in Figure 8. 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] The first coil substrate 111 includes a first surface S1 and a second surface S2 that face each other. When the first coil module 1 is used in the charging assembly 205 shown in Figure 4, the first surface S1 can face away from the first magnetic shielding sheet 2, while the second surface S2 faces toward the first magnetic shielding sheet 2. Alternatively, the first surface S1 can face toward the first magnetic shielding sheet 2, while the second surface S2 can face away from the first magnetic shielding sheet 2.

[0123] The first coil layer 112 is disposed on the first surface S1. Specifically, the first coil layer 112 can be a metal pattern layer formed on the first surface S1, or a metal conductor bonded to the first surface S1. The following embodiments are described based on the first coil layer 112 being a metal pattern layer formed on the first surface S1, and this should not be considered a special limitation of the present application.

[0124] The first coil layer 112 includes a first coil portion 112 a and a second coil portion 112 b disposed around the first coil portion 112 a .

[0125] The first coil portion 112a includes at least one turn of the first coil 112a1. In the embodiment shown in FIG9, the first coil portion 112a includes two turns of the first coil 112a1.

[0126] The innermost first coil turn 112a1 within the first coil portion 112a forms the innermost coil turn within the first coil layer 112. This innermost first coil turn 112a1 within the first coil portion 112a is the first coil turn 112a1 within 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 coil turn within the first coil layer 112 is the first coil turn within the first coil layer 112 that is closest to the area surrounded by the first coil layer 112 on the first surface S1.

[0127] The inner diameter of the first coil layer 112 is D11, and the outer diameter of the first coil layer 112 is D12. Based on this, the outer diameter D1 of the first coil portion 112a satisfies the condition: D11≤D1≤(D11+D12) / 2.

[0128] The second coil portion 112b includes at least one turn of the second coil 112b1 extending helically along the first surface S1. In the embodiment shown in Figure 9, the second coil portion 112b includes two turns of the second coil 112b1 extending helically along the first surface S1.

[0129] Continuing with Figure 9, the second coil layer 113 is disposed on the second surface S2. Specifically, the second coil layer 113 can be a metal pattern layer formed on the second surface S2, or a metal conductor bonded to the second surface S2. The following embodiments are described based on the second coil layer 113 being a metal pattern layer formed on the second surface S2, and this should not be considered a specific limitation of this application.

[0130] The second coil layer 113 includes a third coil portion 113 a and a fourth coil portion 113 b disposed around the third coil portion 113 a .

[0131] The third coil portion 113a includes at least one turn of the third coil 113a1. In the embodiment shown in FIG9, the third coil portion 113a includes two turns of the third coil 113a1.

[0132] The innermost third coil turn 113a1 within the third coil portion 113a forms the innermost coil turn within the second coil layer 113. This innermost third coil turn 113a1 within the third coil portion 113a is the turn of the third coil 113a1 within 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 turn within the second coil layer 113 is the turn of the second coil layer 113 that is closest to the area surrounded by the second coil layer 113 on the second surface S2.

[0133] The inner diameter of the second coil layer 113 is D21, and the outer diameter of the second coil layer 113 is D22. Based on this, the outer diameter D3 of the third coil portion 113a satisfies the condition: D21≤D3≤(D21+D22) / 2.

[0134] The fourth coil portion 113b also includes at least one fourth coil turn 113b1 extending helically along the second surface S2. In the embodiment shown in Figure 9, the fourth coil portion 113b includes two fourth coil turns 113b1 extending helically along the second surface S2.

[0135] Based on the above, at least a portion of the third coil portion 113a is connected in parallel with at least a portion of the first coil portion 112a to form a first parallel body. Specifically, the two portions forming the first parallel body can be a section of a single turn of the third coil 113a1 within the third coil portion 113a and a section of a single turn of the first coil 112a1 within the first coil portion 112a, or a single turn of the third coil 113a1 within the third coil portion 113a and a single turn of the first coil 112a1 within the first coil portion 112a, or multiple turns of the third coil 113a1 within the third coil portion 113a and multiple turns of the first coil 112a1 within the first coil portion 112a, or the entire third coil portion 113a and the entire first coil portion 112a. This is not specifically limited here.

[0136] In some embodiments, referring to FIG. 9 , the at least one first coil 112a1 included in the first coil portion 112a corresponds to the at least one third coil 113a1 included in the third coil portion 113a. The term "corresponding" in this embodiment and the following embodiments means "relative," meaning that the at least one first coil 112a1 and the at least one third coil 113a1 overlap in orthographic projection on the first surface S1 or the second surface S2. Specifically, the at least one first coil 112a1 and the at least one third coil 113a1 can be equal in number and correspond one-to-one, or one first coil 112a1 can correspond to multiple third coils 113a1, or multiple first coils 112a1 can correspond to one third coil 113a1, without further limitation. The following embodiments are based on the assumption that the at least one first coil 112a1 and the at least one third coil 113a1 are equal in number and correspond one-to-one.

[0137] Each turn of the first coil 112a1 is connected in parallel with the corresponding third coil 113a1 to form a first parallel body. To achieve the parallel connection of the first coil 112a1 and the corresponding third coil 113a1, as further described in FIG9 , the first coil substrate 111 is optionally provided with a first metallized via 114 and a second metallized via 115. 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, while 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, the parallel connection achieved through the metallized vias ensures the neat appearance of the first coil substrate 11. 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 using electrical connection structures such as wires to achieve parallel connection, which is not specifically limited here.

[0138] Based on 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.

[0139] This reduces the impedance of the first coil plate 11, improves the uneven distribution of the induced current within the first coil plate 11, reduces the losses of the first coil plate 11, achieves an optimal Q value, and improves wireless charging efficiency. Furthermore, the second coil portion 112b and the fourth coil portion 113b are arranged in series with the first parallel body, and the second coil portion 112b and the fourth coil portion 113b are not arranged in parallel. This allows the number of turns of the coil connected in series between the first terminal d1 and the second terminal d2 to be maintained within a relatively large range, thereby ensuring the mutual inductance between the first coil module and the charging coil, thereby ensuring wireless charging efficiency.

[0140] To further illustrate the above effects, please refer to Figures 10 and 11. Figure 10 is a structural schematic diagram of a first coil module 1 provided by the related art, and Figure 11 is a cross-sectional structural schematic diagram of the first coil module 1 shown in Figure 10 at line BB. In this 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 arranged 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 respectively arranged on two opposite surfaces of the first coil substrate 111. The second coil plate 12 includes a second coil substrate 121 and a third coil layer 122 and a fourth coil layer 123 respectively arranged on two opposite surfaces of the second coil substrate 121. 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 spirally along a plane, 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.

[0141] Please refer to Figure 12, which shows the electric field distribution of first coil layer 112, second coil layer 113, third coil layer 122, and fourth coil layer 123 within first coil module 1 shown in Figure 11 during the charging process. As shown in Figure 12, less than half of the coils in first coil module 1, which face the inner edge, are affected by the charging magnetic field, resulting in uneven current distribution and high impedance.

[0142] Therefore, compared to the related art shown in Figures 10-12, in the embodiment of the present application, the first coil portion 112a and the third coil portion 113a within the first coil plate 11 belong to the portion of the first coil module 1 that is less than 1 / 2 of the portion facing the inner edge. On this basis, at least a portion of the third coil portion 113a is connected in parallel with at least a portion of the first coil portion 112a to form a first parallel body, and 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. This can improve the uneven distribution of coil current, reduce impedance, and improve the charging efficiency of the first coil module. At the same time, the second coil portion 112b and the fourth coil portion 113b are connected in series with the first parallel body, and the second coil portion 112b and the fourth coil portion 113b are not connected in parallel. This can maintain the number of turns of the coil connected in series between the first terminal d1 and the second terminal d2 within a large range, thereby ensuring the mutual inductance between the first coil module and the charging coil, thereby ensuring wireless charging efficiency.

[0143] The following further describes the embodiments of the present application.

[0144] Referring back to Figure 9 , the at least one first coil turn 112a1 included in the first coil portion 112a is connected in parallel with the at least one third coil turn 113a1 included in the third coil portion 113a, forming at least one first parallel body. Furthermore, the second coil portion 112b and the fourth coil portion 113b can be connected in series with all or some of the at least one first parallel body, without specific limitation.

[0145] In some embodiments, the second coil portion 112b, the fourth coil portion 113b, and all of the first parallel bodies in the at least one first parallel body are connected in series. In other words, all of the first parallel bodies in the at least one first parallel body are connected in series, and the second coil portion 112b, the fourth coil portion 113b, and the at least one first parallel body in series are connected in series.

[0146] For example, in the embodiment shown in FIG9 , two turns of the first coil 112a1 are connected in parallel with two turns of the third coil 113a1, forming two first parallel bodies. Furthermore, the two first parallel bodies are connected in series, and the second coil portion 112b and the fourth coil portion 113b are connected in series with the two first parallel bodies.

[0147] 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.

[0148] In the above embodiments, to achieve the series connection of at least one first parallel body, in some embodiments, referring to FIG. 9 , the at least one first coil turn 112a1 included in the first coil portion 112a is disposed separately from one another. That is, the at least one first coil turn 112a1 is spaced apart from one another and does not contact one another. For example, in the embodiment shown in FIG. 9 , the two first coil turns 112a1 included in the first coil portion 112a are disposed separately from one another.

[0149] Based on the above, the at least one third coil turn 113a1 included in the third coil portion 113a is electrically connected sequentially from the inside out. For example, in the embodiment shown in Figure 9 , the two third coil turns 113a1 included in the third coil portion 113a are electrically connected sequentially via a second connecting portion a2. The second connecting portion a2 is provided on the second surface S2 and is integrally formed with the two adjacent third coil turns 113a1. This ensures a neat appearance.

[0150] Based on 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, referring to Figure 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 via metallized vias (including first metallized vias 114 and second metallized vias 115). The number of first metallized vias 114 and second metallized vias 115 can be one or more. In the embodiment shown in Figure 9, the number of first metallized vias 114 and second metallized vias 115 is two.

[0151] 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 is connected in series with the help of the second connecting portion a2 between two adjacent turns of the third coil 113a1. This structure is simple and has a neat appearance.

[0152] Based on any of the above embodiments, to further improve current distribution uniformity, refer to FIG9 . The first coil portion 112a includes a first turn of the first coil 112a1, and the third coil portion 113a includes a second turn of the third coil 113a1. The first turn of the first coil 112a1 can be any first turn of the first coil 112a1 within the first coil portion 112a, and the second turn of the third coil 113a1 can be any third turn of the third coil 113a1 within the third coil portion 113a. The second turn of the third coil 113a1 corresponds to the first turn of the first coil 112a1.

[0153] Please refer to Figure 13, which is a schematic diagram of the electrical connection path between the first turn of the first coil 112a1 and the second turn of the third coil 113a1 in the first coil module 1 shown in Figure 9. This embodiment is illustrative in that the first turn of the first coil 112a1 is the innermost turn of the first coil 112a1 within the first coil portion 112a, and the second turn of the third coil 113a1 is the innermost turn of the third coil 113a1 within the third coil portion 113a.

[0154] The first coil turn 112a1 includes a first coil segment k1 and a second coil segment k2, which are arranged circumferentially along the first coil turn 112a1. The first coil segment k1 and the second coil segment k2 can be two semicircular arc segments, or the first coil segment k1 can be a dominant arc segment and the second coil segment k2 can be an inferior arc segment. Alternatively, the first coil segment k1 can be an inferior arc segment and the second coil segment k2 can be a dominant arc segment; or both the first coil segment k1 and the second coil segment k2 can be inferior arc segments.

[0155] The first coil segment k1 includes a first inner loop portion k11 and a first outer loop portion k12. The first outer loop portion k12 is located outside the first inner loop portion k11. The outside of the first inner loop portion k11 refers to the side of the first inner loop portion k11 that is away from the area on the first surface S1 surrounded by the first coil portion 112a. The first outer loop portion k12 and the first inner loop portion k11 can be connected or spaced apart. This embodiment and the following embodiments are based on the first outer loop portion k12 being spaced apart from the first inner loop portion k11. This ensures that the first outer loop portion k12 and the first inner loop portion k11 are independent of each other, and the internal currents are separated.

[0156] Furthermore, the second coil segment K2 includes a second inner loop portion k21 and a second outer loop portion k22. The second outer loop portion k22 is located outside the second inner loop portion k21. The outer side of the second inner loop portion k21 refers to the side of the second inner loop portion k21 that is away from the area on the first surface S1 surrounded by the first coil portion 112a. The second outer loop portion k22 and the second inner loop portion k21 can be connected or spaced apart. This embodiment and the following embodiments are based on the second outer loop portion k22 being spaced apart from the second inner loop portion k21. This makes the second outer loop portion k22 independent of the second inner loop portion k21, and the internal currents are separated.

[0157] Continuing with Figure 13, the second-turn third coil 113a1 includes a third coil segment n1 and a fourth coil segment n2, which are arranged circumferentially around the second-turn third coil 113a1. The third coil segment n1 and the fourth coil segment n2 can be two opposing semicircular arc segments, or the third coil segment n1 can be a dominant arc segment and the fourth coil segment n2 can be an inferior arc segment, or the third coil segment n1 can be an inferior arc segment and the fourth coil segment n2 can be a dominant arc segment; or both the third coil segment n1 and the fourth coil segment n2 can be inferior 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.

[0158] The third coil segment n1 includes a third inner loop n11 and a third outer loop n12. The third outer loop n12 is located outside the third inner loop n11. The outer side of the third inner loop n11 refers to the side of the third inner loop n11 that is away from the area on the second surface S2 surrounded by the third coil portion 113a. The third outer loop n12 and the third inner loop n11 can be connected or spaced apart. This embodiment and the following embodiments are based on a spaced-apart arrangement of the third outer loop n12 and the third inner loop n11. This ensures that the third outer loop n12 and the third inner loop n11 are independent of each other, and their internal currents are separated.

[0159] Furthermore, the fourth coil segment n2 includes a fourth inner loop portion n21 and a fourth outer loop portion n22. The fourth outer loop portion n22 is located outside the fourth inner loop portion n21. The outer side of the fourth inner loop portion n21 refers to the side of the fourth inner loop portion n21 that is away from the area on the second surface S2 surrounded by the third coil portion 113a. The fourth outer loop portion n22 and the fourth inner loop portion n21 can be connected or spaced apart. This embodiment and the following embodiments are based on a spaced-apart arrangement of the fourth outer loop portion n22 and the fourth inner loop portion n21. This ensures that the fourth outer loop portion n22 and the fourth inner loop portion n21 are independent of each other, and their internal currents are separated.

[0160] Based on the above, referring to Figure 13 , the end of the first outer ring portion k12 facing the second outer ring portion k22 is electrically connected to the end of the second inner ring portion k12 facing the first inner ring portion k11. In some embodiments, these two ends are electrically connected via a third connecting portion a3. This third connecting portion a3 is disposed on the first surface S1 and is integrally formed with the first outer ring portion k12 and the second inner ring portion k12. This ensures a neat appearance.

[0161] The end of the third outer ring portion n12 facing the fourth outer ring portion n22 is electrically connected to the end of the first outer ring portion k12 facing the second outer ring portion k22. In some embodiments, these two ends are electrically connected via a third metallized via 116. This ensures a neat appearance. The number of third metallized vias 116 can be one or more. In the embodiment shown in Figure 13, there are two third metallized vias 116, which helps reduce impedance.

[0162] The end of the fourth inner ring portion n21 facing the third inner ring portion n11 is electrically connected to the end of the second inner ring portion k21 facing the first inner ring portion k11. In some embodiments, these two ends are electrically connected via a fourth metallized via 117. This ensures a neat appearance. The number of fourth metallized vias 117 can be one or more. In the embodiment shown in Figure 13, there are two fourth metallized vias 117, which helps reduce impedance.

[0163] The end of the third inner ring portion n11 facing the fourth inner ring portion n21 is electrically connected to the end of the fourth outer ring portion n22 facing the third outer ring portion n12. In some embodiments, these two ends are electrically connected via a fourth connecting portion a4. The fourth connecting portion a4 is disposed on the second surface S2 and is integrally formed with the third inner ring portion n11 and the fourth outer ring portion n22. This ensures a neat appearance.

[0164] The end of the first inner ring portion k11 facing the second inner ring portion k21 is electrically connected to the end of the third inner ring portion n11 facing the fourth inner ring portion n21. In some embodiments, these two ends are electrically connected via a fifth metallized via 118. This ensures a neat appearance. The number of fifth metallized vias 118 can be one or more. In the embodiment shown in Figure 13, there are two fifth metallized vias 118, which helps reduce impedance.

[0165] The end of the second outer ring portion K22 facing the first outer ring portion K12 is electrically connected to the end of the fourth outer ring portion n22 facing the third outer ring portion n12. In some embodiments, these two ends are electrically connected via a sixth metallized via 119. This ensures a neat appearance. The number of sixth metallized vias 119 can be one or more. In the embodiment shown in Figure 13, there are two sixth metallized vias 119, which helps reduce impedance.

[0166] In this way, a single turn of the first coil 112a1 within the first coil portion 112a is formed by joining together multiple parts, and a single turn of the third coil 113a1 within the third coil portion 113a is also formed by joining together multiple parts. Furthermore, a single turn of the first coil 112a1 and a corresponding single turn of the third coil 113a1 form an inner-outer cross structure, further improving the uneven current distribution between the inner and outer layers and reducing impedance.

[0167] On the basis of the above embodiment, in order to connect the above-mentioned second coil portion 112b, the fourth coil portion 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 back to Figure 9, the two ends of the third coil portion 113a are respectively the first end t1 and the second end t2.

[0168] First end t1 is located on the outermost third coil turn 113a1 within third coil portion 113a and is electrically connected to an end of fourth coil portion 113b facing third coil portion 113a. An end of fourth coil portion 113b facing away from third coil portion 113a is electrically connected to first terminal d1. Specifically, the end of fourth coil portion 113b facing away from third coil portion 113a can be electrically connected to first terminal d1 by contact, or can be indirectly electrically connected to first terminal d1 via other structures.

[0169] The second end t2 is located on the innermost turn of the third coil 113a1 in the third coil part 113a. The second end t2 is electrically connected to the end of the second coil part 112b facing the first coil part 112a, and the end of the second coil part 112b away from the first coil part 112a is electrically connected to the second terminal d2.

[0170] In this way, the second coil portion 112b, the fourth coil portion 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.

[0171] In the above embodiment, to achieve 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, as further described in FIG9 , the innermost first coil 112a1 within the first coil portion 112a corresponds to the innermost third coil 113a1. The end of the innermost first coil 112a1 electrically connected to the second end t2 serves as the third end t3. A first gap g1 is defined between the ends of each first coil 112a1 circumferentially around the first coil portion 112a. Furthermore, the first coil plate 11 further includes a first connecting portion a1. The first connecting portion a1 is disposed on the first surface S1 and extends through 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 portion 112b facing the first coil portion 112a. Thus, with the help of the metallized via between the third end t3 and the second end t2, and the first connecting portion a1, the second end t2 is electrically connected to the end of the second coil part 112b facing the first coil part 112a, which can avoid the intersection of the metal layer of the first surface S1 and ensure a neat appearance.

[0172] In some embodiments, the first connecting portion a1, the first coil portion 112a, and the second coil portion 112b are integrally formed, thereby reducing manufacturing difficulty and ensuring a neat appearance.

[0173] Referring to Figure 12, within the first coil module 1, current distribution is uneven not only in the portion of the coil (less than half) toward the inner edge but also in the portion of the coil (less than one-third) toward the outer edge. To further reduce the impedance of the first coil plate 11, in some embodiments, referring to Figure 9, the first coil layer 112 further includes a fifth coil portion 112c disposed outside the second coil portion 112b.

[0174] The fifth coil portion 112c includes at least one turn of the fifth coil 112c1. In the embodiment shown in FIG9, the fifth coil portion 112c includes one turn of the fifth coil 112c1.

[0175] The outermost fifth coil turn 112c1 within the fifth coil portion 112c forms the outermost coil turn within the first coil layer 112. This outermost fifth coil turn 112c1 within the fifth coil portion 112c is the turn of the fifth coil 112c1 within the fifth coil portion 112c that is closest to the area on the first surface S1 surrounded by the first coil layer 112. The outermost coil turn within the first coil layer 112 is the coil turn within the first coil layer 112 that is farthest from the area on the first surface S1 surrounded by the first coil layer 112.

[0176] The inner diameter D5 of the fifth coil portion satisfies the condition: (D11+D12) / 3≤D5≤D12.

[0177] The second coil 113 further includes a sixth coil portion 113c disposed at the periphery of the fourth coil portion 113b.

[0178] The sixth coil portion 113c includes at least one turn of the sixth coil 113c1. In the embodiment shown in FIG9, the sixth coil portion 113c includes one turn of the sixth coil 113c1.

[0179] The outermost sixth coil turn 113c1 within the sixth coil portion 113c forms the outermost coil turn within the second coil layer 113. This outermost sixth coil turn 113c1 within the sixth coil portion 113c is the turn of the sixth coil 113c1 within 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 coil turn within the second coil layer 113 is the coil turn within the second coil layer 113 that is farthest from the area surrounded by the second coil layer 113 on the second surface S2.

[0180] The inner diameter D6 of the sixth coil portion satisfies the condition: (D21+D22) / 3≤D6≤D22.

[0181] Based on the above, at least a portion of the sixth coil portion 113c is connected in parallel with at least a portion of the fifth coil portion 112c to form a second parallel body. Specifically, the two portions forming the second parallel body can be a section of a single turn of the sixth coil 113c1 within the sixth coil portion 113c and a section of a single turn of the fifth coil 112c1 within the fifth coil portion 112c, or a single turn of the sixth coil 113c1 within the sixth coil portion 113c and a single turn of the fifth coil 112c1 within the fifth coil portion 112c, or multiple turns of the sixth coil 113c1 within the sixth coil portion 113c and multiple turns of the fifth coil 112c1 within the fifth coil portion 112c, or the entire sixth coil portion 113c and the entire fifth coil portion 112c. This is not specifically limited here.

[0182] In some embodiments, referring specifically to FIG9 , the at least one turn of the fifth coil 112c1 included in the fifth coil portion 112c corresponds to the at least one turn of the sixth coil 113c1 included in the sixth coil portion 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 can correspond to one turn of the sixth coil 113c1, without specific limitation herein. The following embodiments are described based on the assumption 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.

[0183] 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, both ends of each turn of the fifth coil 112c1 and the corresponding sixth coil 113c1 can be electrically connected via metallized vias to achieve parallel connection between the two.

[0184] Based on 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.

[0185] 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.

[0186] Continuing with Figure 9, at least one turn of the fifth coil 112c1 included in the fifth coil portion 112c is connected in parallel with at least one turn of the sixth coil 113c1 included in the sixth coil portion 113c, forming at least one second parallel body. Furthermore, the second coil portion 112b, the fourth coil portion 113b, and the first parallel body can be connected in series with all or some of the at least one second parallel body, without specific limitation.

[0187] In some embodiments, the second coil portion 112b, the fourth coil portion 113b, the first parallel body, and all of the second parallel bodies in the at least one second parallel body are arranged in series. In other words, all of 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.

[0188] In this way, the uneven distribution of coil current can be effectively improved and the impedance can be reduced.

[0189] In the above embodiment, to achieve the series connection of at least one second parallel body, in some embodiments, referring to FIG. 9 , the at least one turn of the fifth coil 112c1 included in the fifth coil portion 112c is disposed separately from one another. That is, the at least one turn of the fifth coil 112c1 is spaced apart and does not contact one another.

[0190] Based on the above, the at least one turn of the sixth coil 113c1 included in the sixth coil portion 113c is electrically connected in sequence from the inside to the outside.

[0191] On the basis of the above, the two ends of each turn of the fifth coil 112c1 are electrically connected to the two ends of the corresponding turn of the sixth coil 113c1.

[0192] 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 connection portion between two adjacent turns of the sixth coil 113c1. This structure is simple and has a neat appearance.

[0193] In some embodiments, please continue to refer to FIG9 , each turn of the fifth coil 112c1 and the corresponding turn of the sixth coil 113c1 can also be set to form an inner-outer cross structure as shown in FIG13 , so as to improve the uneven current distribution in the inner and outer layers and further reduce the impedance.

[0194] In order to connect the second coil portion 112b, the fourth coil portion 113b, the first parallel body and the 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 Figure 9, the two ends of the sixth coil 113c1 are respectively the fourth end t4 and the fifth end t5.

[0195] 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.

[0196] 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.

[0197] 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.

[0198] In the above embodiment, to electrically connect the fifth end t5 to the first terminal d1, in some embodiments, referring to Figure 9 , the outermost fifth coil 112c1 within the fifth coil portion 112c corresponds to the outermost sixth coil 113c1. The end of the outermost 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 manner, the electrical connection between the fifth end t5 and the sixth end t6 is achieved via the metallized via between the fifth end t5 and the sixth end t6. This structure is simple and easy to implement.

[0199] To electrically connect the end of the second coil portion 112b facing away from the first coil portion 112a to the second terminal d2, in some embodiments (referring to FIG9 ), a second gap g2 is defined between the ends of each turn of the fifth coil 112c1 along the circumference of the fifth coil portion 112c. Furthermore, the first coil plate 11 further includes a fifth connecting portion a5. The fifth connecting portion a5 is disposed on the first surface S1 and extends through the second gap g2. One end of the fifth connecting portion a5 is electrically connected to the end of the second coil portion 112b facing away from the first coil portion 112a, and the other end is electrically connected to the second terminal d2. This electrical connection between the end of the second coil portion 112b facing away from the first coil portion 112a and the second terminal d2 is achieved by utilizing the fifth connecting portion a5, thereby preventing any cross-contamination of the metal layers on the first surface S1 and ensuring a clean appearance.

[0200] In some embodiments, the fifth connecting portion a5, the second coil portion 112b, and the second terminal d2 are integrally formed, thereby reducing manufacturing difficulty.

[0201] In some embodiments, referring to Figure 9 , both the first terminal d1 and the second terminal d2 are located on the first surface S1, and the first terminal d1 and the second terminal d2 are located outside the first coil layer 112. The outside of the first coil layer 112 refers to the side of the first coil layer 112 that is away from the area on the first surface S1 surrounded by the first coil layer 112. This structure is simple and has a neat appearance. In other embodiments, the first terminal d1 and the second terminal d2 may also be located on the second surface S2, or one may be located on the first surface S1 and the other on the second surface S2, without specific limitation herein.

[0202] The above describes one structural form of first coil plate 11. In this first coil plate 11, the series connection order of second coil section 112b, fourth coil section 113b, first parallel body, and second parallel body between first terminal d1 and second terminal d2 is: first terminal d1 → at least one second parallel body → fourth coil section 113b → at least one first parallel body → second coil section 112b → second terminal d2. Of course, the series connection order of second coil section 112b, fourth coil section 113b, first parallel body, and second parallel body between first terminal d1 and second terminal d2 can also be configured in other ways.

[0203] For example, please refer to Figure 14, which is an exploded view of the first coil module 1 provided in some other embodiments of the present application. In this embodiment, at least one turn of the first coil 112a1 included in the first coil portion 112a is connected in parallel with at least one turn of the third coil 113a1 included in the third coil portion 113a, forming at least one first parallel body. The at least one turn of the first coil 112a1 included in the first coil portion 112a is arranged separately from each other, and the at least one turn of the third coil 113a1 included in the third coil portion 113a is electrically connected in sequence from the inside to the outside, with the two ends of each turn of the first coil 112a1 being electrically connected to the two ends of the corresponding turn of the third coil 113a1. This achieves the series connection of at least one first parallel body.

[0204] Similarly, the at least one turn of the fifth coil 112c1 included in the fifth coil section 112c is connected in parallel with the at least one turn of the sixth coil 113c1 included in the sixth coil section 113c, forming at least one second parallel body. The at least one turn of the fifth coil 112c1 included in the fifth coil section 112c is arranged separately from each other, while the at least one turn of the sixth coil 113c1 included in the sixth coil section 113c is electrically connected sequentially from the inside out. The two ends of each turn of the fifth coil 112c1 are electrically connected to the two ends of the corresponding turn of the sixth coil 113c1. This creates a series connection of at least one second parallel body.

[0205] Based on the above, the third coil portion 113a has two ends: a first end t1 and a second end t2. The first end t1 is located on the outermost third coil turn 113a1 within the third coil portion 113a and is electrically connected to the end of the fourth coil portion 113b facing the third coil portion 113a. The end of the fourth coil portion 113b facing away from the third coil portion 113a is electrically connected to the end of the sixth coil portion 113c facing the fourth coil portion 113b (i.e., the fourth end t4). The end of the sixth coil portion 113c facing away from the fourth coil portion 113b (i.e., the fifth end t5) is electrically connected to the end of the second coil portion 112b facing away from the first coil portion 112a. The end of the second coil portion 112b facing the first coil portion 112a is electrically connected to the second terminal d2. The second end t2 is located on the innermost third coil turn 113a1 within the third coil portion 113a and is electrically connected to the first terminal d1.

[0206] 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.

[0207] In the above embodiment, to electrically connect the end of the sixth coil portion 113c remote from the fourth coil portion 113b to the end of the second coil portion 112b remote from the first coil portion 112a, in some embodiments, referring to Figure 14 , the outermost fifth coil 112c1 within the fifth coil portion 112c corresponds to the outermost sixth coil 113c1. The end of the outermost fifth coil 112c1 electrically connected to the fifth end t5 serves as the sixth end t6. Around the circumference of the fifth coil portion 112c, a second gap g2 is defined between the ends of each fifth coil 112c1. Furthermore, the first coil plate 11 further includes a fifth connecting portion a5. The fifth connecting portion a5 is disposed on the first surface S1 and extends through 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 portion 112b remote from the first coil portion 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, an 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 of the first surface S1 and ensuring a neat appearance.

[0208] In addition, to achieve electrical connection between the end of the second coil portion 112b facing the first coil portion 112a and the second terminal d2, in some embodiments, a first gap g1 is provided between the two ends of each turn of the first coil 112a1 in the circumferential direction of the first coil portion 112a. On this basis, the first coil plate 11 also includes a first connecting portion a1. The first connecting portion a1 is disposed on the first surface S1 and extends through the first gap g1. One end of the first connecting portion a1 is electrically connected to the end of the second coil portion 112b facing the first coil portion 112a, and the other end is electrically connected to the second terminal d2. Thus, by using the first connecting portion a1 to achieve electrical connection between the end of the second coil portion 112b facing the first coil portion 112a and the second terminal d2, the metal layer on the first surface S1 can be prevented from intersecting, thereby ensuring a neat appearance.

[0209] Furthermore, to achieve electrical connection between the second end t2 and the first terminal d1, in some embodiments, the second end t2 is located on the innermost third coil 113a1 within the third coil portion 113a. The innermost first coil 112a1 within the first coil portion 112a corresponds to the innermost third coil 113a1. The end of the innermost 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 achieved via a metallized via between the third end t3 and the second end t2. This allows the first terminal d1 to be positioned on the first surface S1, facilitating processing.

[0210] In some embodiments, referring to FIG. 14 , first terminal d1 and second terminal d2 are both located on first surface S1, and are located inside first coil layer 112. The inside of first coil layer 112 refers to the side of first coil layer 112 that faces the area surrounded by first coil layer 112 on first surface S1. This structure is simple and has a neat appearance.

[0211] In some embodiments, please refer to Figure 15, which is a schematic diagram of the cross-sectional structure of the first coil module 1 shown in Figure 7 at line AA. In this embodiment, the first coil layer 112 and the second coil layer 113 may include two layers of metal material. Specifically, referring to Figure 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, and the second metal material layer 1122 is a plating layer formed on the surface of the first metal material layer 1121 facing away from the first surface S1 when forming a plated through hole (PTH).

[0212] 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.

[0213] In other embodiments, the first coil layer 112 and the second coil layer 113 may also be a single layer of metal, or three or more layers of metal, which is not specifically limited here.

[0214] In some embodiments, referring to FIG. 15 , a first protective layer 120 a is further provided on the side of the first coil layer 112 facing away from the first coil substrate 111. The first protective layer 120 a is an insulating layer. The material of the first protective layer 120 a is made of, but is not limited to, at least one of PI, PC, PC + fiberglass, and ABS plastic. The first protective layer 120 a is used to protect the first coil layer 112. The colors of the first protective layer 120 a include, but are not limited to, black, white, yellow, etc.

[0215] In some embodiments, a first adhesive layer 110 a is further disposed between the first protective layer 120 a and the first coil layer 112 . The first adhesive layer 110 a is used to bond the first protective layer 120 a to the first coil layer 112 .

[0216] Similarly, referring to Figure 15 , a second protective layer 120b is 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 includes, but is not limited to, at least one of PI, PC, PC + fiberglass, and ABS plastic. The second protective layer 120b is used to protect the second coil layer 113. The colors of the second protective layer 120b include, but are not limited to, black, white, yellow, etc.

[0217] In some embodiments, a second adhesive layer 110b is further provided between the second protective layer 120b and the second coil layer 113. The second adhesive layer 110b is used to bond the second protective layer 120b to the second coil layer 113.

[0218] Please refer to Table 1 below, which records the optional materials and thicknesses of the various layers in the first coil plate 11 .

[0219] Table 1

[0220] It should be noted that Table 1 exemplifies the optional materials and thicknesses of the various layers in the first coil plate 11 , which cannot be considered as a special limitation on the optional materials and thicknesses of the various layers in the first coil plate 11 .

[0221] The structure of the first coil plate 11 is described above. The structure of the second coil plate 12 may be the same as that of the first coil plate 11 .

[0222] Specifically, referring back to Figure 8 , the second coil plate 12 is located on the side of the second surface S2 within the first coil plate 11 that faces away from the first surface S1. Referring to Figure 16 , FIG16 is a further exploded view of the second coil plate 12 in the first coil module 1 shown in FIG8 . The second coil plate 12 includes a second coil base plate 121 , a third coil layer 122 , and a fourth coil layer 123 .

[0223] The second coil substrate 121 is a rigid insulating substrate. The second coil substrate 121 includes a third surface S3 and a fourth surface S4 facing each other. Referring back to FIG8 , the third surface S3 faces away from the first coil plate 11 , while the fourth surface S4 faces the first coil plate 11 .

[0224] The third coil layer 122 is disposed on the third surface S3. Its structure is identical to that of the first coil layer 112 and is not further described here. The fourth coil layer 123 is disposed on the fourth surface S4. Its structure is identical to that of the second coil layer 113 and is not further described here. The connection between the third and fourth coil layers 122, 123 is identical to that between the first and second coil layers 112, 113 and is not further described here.

[0225] Second coil plate 12 also includes a third terminal d3 and a fourth terminal d4. Third terminal d3 is electrically connected to second terminal d2, and fourth terminal d4 forms second external terminal W2. This allows first coil plate 11 and second coil plate 12 to be connected in series between first external terminal W1 and second external terminal W2.

[0226] In the above embodiment, the third terminal d3 and the second terminal d2 can be electrically connected via a welding point, or can be integrally formed. In some embodiments, the third terminal d3 and the second terminal d2 are integrally formed.

[0227] Specifically, please refer to Figure 16. The second coil substrate 121 includes a second connecting portion 121a, and the third terminal d3 is arranged in the area of ​​the third surface S3 located on the second connecting portion 121a. Please return to Figure 9. The first coil substrate 111 includes a first connecting portion 111a, and the second terminal d2 is arranged in the area of ​​the first surface S1 located on the first connecting portion 111a. The second connecting portion 121a is connected to the first connecting 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, the first coil module 1 shown in Figure 8 can be formed by folding the first coil module in the unfolded state in half and bonding it with the glue layer 13. Please refer to Figure 17, which is a schematic structural diagram of the first coil module 1 in the unfolded state provided in some embodiments of the present application. This can reduce the processing difficulty of the first coil module 1 and reduce production costs.

[0228] In other embodiments, the structure of the second coil plate 12 may be different from that 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 may also include a third coil plate, a fourth coil plate, a fifth coil plate, and so on, which are stacked therewith. The structures of the third coil plate, the fourth coil plate, and the fifth coil plate may be the same as or different from that of the first coil plate 11, and this is not specifically limited here.

[0229] In order to verify the performance of the first coil module 1 provided in the embodiment of the present application, please refer to Figure 18, which is a current simulation diagram of the first coil module 1 shown in Figure 7. As can be seen from Figure 8, the uniformity of the current distribution is relatively good, and the simulated AC resistance RAC is 329mΩ. The AC resistance RAC obtained by simulation of the first coil module having the same inner diameter, outer diameter, number of coil layers, and number of turns of each coil layer as the first coil module 1 shown in Figure 7, and each coil turn is arranged in series with other coils, is 400mΩ. The loss of the first coil module 1 described in the technical solution of the present application is optimized by 17.5%.

[0230] The present application also provides a charger 100A, which is used to charge the above-mentioned electronic device 100.

[0231] Referring to Figures 19-21, Figure 19 is a perspective view of a charger 100A provided in some embodiments of the present application, Figure 20 is a schematic cross-sectional view of the charger 100A shown in Figure 19 taken along line CC, and Figure 21 is a schematic structural view of the charger 100A shown in Figure 20 when charging the electronic device 100. The charger 100A includes a housing 0 and a second coil module 6, a second magnetic shielding sheet 7, and a second magnet 8 disposed within the housing 0.

[0232] It should be understood that Figures 19 and 20 schematically illustrate some components of the charger 100A, and the actual shape, size, location, and configuration of these components are not limited to those in Figures 19 and 20. In other embodiments, the charger 100A may further include a voltage conversion unit that converts commercial household alternating current (AC) power into an AC voltage having a specific frequency.

[0233] The second coil module 6 is the main body for emitting electricity. It is a wire wound along a circular extension path. The second coil module 6 is used to cooperate with the first coil module 1 in the electronic device 100 for charging. The structure of the second coil module 6 can be the same as that of the first coil module 1, or it can be different, and this is not specifically limited here.

[0234] The second magnetic shielding sheet 7 is stacked with the second coil module 6, ie, parallel to the plane of the circular extension path of the conductors within the second coil module 6. A gap may exist between the second magnetic shielding sheet 7 and the second coil module 6, or the two sheets may be in direct contact. The second magnetic shielding sheet 7 acts as a shield to block leakage magnetic flux or electromagnetic waves on its outer surface, thereby increasing the power transmission capability of the second coil module 6 toward the side facing away from the second magnetic shielding sheet 7.

[0235] The orthographic projection of the second magnet 8 is located within the plane of the second coil module 6, within the area surrounding the coil within the second coil module 6. The plane of the second coil module 6 refers to the plane within which the annular extension of the conductor within the second coil module 6 lies. The second magnet 8 can be disposed within the inner hole of the second coil module 6 or elsewhere, such as embedded within the housing, without specific limitation.

[0236] 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 in conjunction with 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.

[0237] In order to avoid the above problems, the structure of the second magnet 8 will be described in detail below.

[0238] Please refer to Figures 22 and 23. Figure 22 is a three-dimensional view of the second magnet 8 provided in some embodiments of the present application, and Figure 23 is a schematic diagram of the cross-sectional structure of the second magnet 8 shown in Figure 22 at the DD line. 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 illustrative of 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.

[0239] The central magnet 4 has opposing fifth and sixth surfaces S5 and S6. When the second magnet 8 is used in the charger 100A shown in Figures 19 and 20, the direction in which the fifth surface S5 points toward the sixth surface S6 aligns with the direction in which the second magnetic barrier 7 points toward the second coil module 6. Thus, during charging, the sixth surface S6 faces the first magnet 206 within the electronic device 100, while the fifth surface S5 faces away from the first magnet 206 within the electronic device 100.

[0240] Based on 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 understood that the magnetization direction described in this embodiment and the embodiments below is the direction from the north pole to the south pole, or from the south pole to the north pole. Specifically, referring to Figure 23, one end of the fifth surface S5 can be the south pole, and one end of the sixth surface S6 can be the north pole. In other embodiments, one end of the fifth surface S5 can also be the north pole, and one end of the sixth surface S6 can be the south pole.

[0241] 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. In the embodiment shown in FIG23 , the end of the center magnet 4 where the sixth surface S6 is located is the north pole, the end of the outer ring magnet 5 facing the center magnet 4 is also the north pole, and the end of the outer ring magnet 5 away from the center magnet 4 is the south pole.

[0242] In other embodiments, when one end of the fifth surface S5 on the central magnet 4 is located as the N pole and one end of the sixth surface S6 is located as the S pole, the end of the outer ring magnet 5 facing the central magnet 4 is also the S pole, and the end of the outer ring magnet 5 away from the central magnet 4 is the N pole.

[0243] In this way, the second magnet 8 can concentrate the magnetic field direction, prevent the magnetic field from spreading, and reduce the impact of the magnetic field on the first magnetic barrier 2. This prevents the first magnetic barrier 2 from becoming magnetically saturated due to the excessive magnetic field at its location, thereby preventing the first magnetic barrier 2 from losing its magnetic isolation ability. At the same time, the thickness of the first magnetic barrier 2 can be reduced, leaving more height design space for the first coil module 1, thereby increasing the number of coil plates in the first coil module 1, thereby increasing the number of coil turns and improving charging efficiency.

[0244] The above technical effects are further explained below in conjunction with the simulation results. Please refer to Figures 24 to 27. Figure 24 is a magnetic pole distribution and magnetic field distribution diagram of a traditional magnet provided in some embodiments of the present application. Specifically, (a) in Figure 24 is a magnetic pole distribution diagram of a traditional whole magnet, and (b) in Figure 24 is a magnetic field distribution diagram of a traditional magnet. Figure 25 is a magnetic field distribution diagram of the first magnetic isolation plate 2 when the second magnet 8 in the charger 100A in the charging system shown in Figure 21 is the traditional structure shown in Figure 24. Figure 26 is a magnetic field distribution diagram of the second magnet 8 shown in Figure 23. Figure 27 is a magnetic field distribution diagram of the first magnetic isolation plate 2 when the second magnet 8 in the charger 100A in the charging system shown in Figure 21 is the improved structure shown in Figure 23. By comparing Figure 26 with (b) in Figure 24, it can be seen that the magnetic field of the second magnet 8 provided in the present application is relatively concentrated. At the same time, by comparing Figure 25 with Figure 27, when the second magnet 8 provided in the present application is used in the charger 100A in the charging system shown in Figure 21, the magnetic field strength of the first magnetic isolation plate 2 in the electronic device 100 is low, and the possibility of magnetic saturation is small.

[0245] 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 inside the charger, the magnetic attraction between the magnet 206 and the magnet inside the charger can be enhanced to ensure positioning accuracy.

[0246] In the above embodiment, the central magnet 4 can be a single magnet or a plurality of magnet units stacked along the Z-axis. In the embodiment shown in FIG23 , the central magnet 4 is a single magnet, which is a simple structure and easy to implement.

[0247] In other embodiments, please refer to Figures 28 and 29. Figure 28 is a perspective view of the central magnet 4 provided in yet other embodiments of the present application, and Figure 29 is a diagram of the magnetic pole distribution of the central magnet 4 shown in Figure 28. In this embodiment, the central magnet 4 includes two first magnet units 41 stacked along the Z-axis, with the two first magnet units 41 having the same magnetization direction. This reduces the difficulty of manufacturing the central magnet 4.

[0248] In the embodiment shown in FIG22 , multiple outer ring magnets 5 are arranged around the central magnet 4 in the magnetization direction. This structure is simple, and the outer ring magnets 5 are relatively easy to form. Specifically, the number of outer ring magnets 5 can be six as shown in FIG22 , two as shown in FIG30 , three as shown in FIG31 , four as shown in FIG32 , and so on.

[0249] In other embodiments, please refer to Figure 33, which is a perspective view of the second magnet 8 provided in some other 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 easy to assemble.

[0250] 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.

[0251] In some embodiments, please refer to Figure 34, which is a perspective view of the second magnet 8 provided in yet 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. The two second magnet units 51 have the same magnetization direction. This reduces the difficulty of manufacturing the outer ring magnet 5.

[0252] In the above embodiments, the second magnet 8 as a whole and the central magnet 4 in the second magnet 8 are roughly cylindrical, and the outer ring magnet 5 is in the shape of an arc or a ring. 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 Figure 35, which is a stereoscopic view of six second magnets 8 provided in some other embodiments of the present application. The second magnet 8 as a whole and the central magnet 4 in the second magnet 8 can also be in the shape of a hexagonal prism as shown in (a) of Figure 35, a triangular prism as shown in (b) of Figure 35, or a cubic prism as shown in (c) of Figure 35, without specific limitation here. Alternatively, the second magnet 8 as a whole is cylindrical, and the central magnet 4 in the second magnet 8 is in other shapes. For example, please refer to (d), (e) and (f) in Figure 35, the second magnet 8 as a whole is cylindrical, and the central magnet 4 in the second magnet 8 is in the shape of a cubic prism, a hexagonal prism, and a triangular prism, respectively.

[0253] 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.

[0254] 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 them. 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, characterized in that: include: A first coil module for wireless charging, wherein the first coil module includes a first coil plate, wherein: The first coil plate includes: 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 around the first coil portion, the first coil portion comprising at least one first coil turn, the innermost first coil turn in the first coil portion being the innermost coil turn in the first coil layer; a second coil layer, the second coil layer being disposed on the second surface, the second coil layer comprising a third coil portion and a fourth coil portion disposed periphery of the third coil portion, the third coil portion comprising at least one third coil turn, the innermost third coil turn within the third coil portion being the innermost coil turn within the second coil layer, at least a portion of the third coil portion being connected in parallel with at least a portion of the first coil portion to form a first parallel body, the second coil portion, the fourth coil portion, and the first parallel body being connected in series between the first terminal and the second terminal; 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.

2. The electronic device according to claim 1, wherein The at least one turn of the first coil corresponds to the at least one turn of the third coil respectively, each turn of the first coil is connected in parallel with the corresponding third coil to form the first parallel body, and the second coil part, the fourth coil part and at least one of the first parallel bodies are connected in series between the first terminal and the second terminal.

3. The electronic device according to claim 2, wherein: 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, wherein: 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.

5. The electronic device according to claim 4, characterized in that The third coil portion comprises a first end and a second end, the first end being located on the outermost third coil turn within the third coil portion, the first end being electrically connected to an end of the fourth coil portion facing the third coil portion, and an end of the fourth coil portion facing away from the third coil portion being 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.

6. The electronic device according to any one of claims 3 to 5, characterized in that: 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; 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, wherein the second outer ring portion is located outside the second inner ring portion; The second-turn 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.

7. The electronic device according to any one of claims 1 to 6, characterized in that: The first coil layer further includes a fifth coil portion disposed on the periphery of the second coil portion, the fifth coil portion including 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 on the periphery of the fourth coil portion, the sixth coil portion including at least one turn of a 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 a portion of the sixth coil portion is connected in parallel with at least a portion 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; and the inner diameter D6 of the sixth coil portion satisfies the condition: (D21+D22) / 3≤D6≤D22.

8. The electronic device according to claim 7, wherein: The at least one turn of the fifth coil corresponds to the at least one turn of the sixth coil respectively, and each turn of the fifth coil is connected in parallel with the corresponding sixth coil to form the second parallel body; The second coil portion, the fourth coil portion, the first parallel body, and at least one of the second parallel bodies are connected in series between the first terminal and the second terminal.

9. The electronic device according to claim 8, wherein: 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.

10. The electronic device according to claim 9, characterized in that The at least one turn of the fifth coil is arranged separately from each other; The 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.

11. The electronic device according to claim 10, wherein: The sixth coil portion has two ends, namely a fourth end and a fifth end, wherein the fourth end is located on the innermost turn of the sixth coil in the sixth coil portion, and the fourth end is electrically connected to an end of the fourth coil portion away from the third coil portion; The fifth end is located on the outermost turn of the sixth coil in the sixth coil portion, and the fifth end is electrically connected to the first terminal.

12. The electronic device according to any one of claims 1 to 11, characterized in that: The first terminal and the second terminal are disposed on the first surface and located outside the first coil layer.

13. The electronic device according to any one of claims 1 to 11, characterized in that: The first terminal and the second terminal are disposed on the first surface and located inside the first coil layer.

14. The electronic device according to any one of claims 1 to 13, 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. The third terminal is electrically connected to the second terminal.

15. The electronic device according to claim 14, characterized in that 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.

16. The electronic device according to any one of claims 1 to 15, characterized in that: The electronic device further comprises: The first magnetic isolation sheet is located on one side of the first coil module and is stacked with the first coil module.

17. The electronic device according to claim 16, wherein: The relative magnetic permeability of the material of the first magnetic isolation sheet is greater than or equal to 100.

18. A wireless charging system, characterized in that: include: An electrical device, wherein the electrical device is the electronic device according to any one of claims 1 to 17; A charger includes a second coil module, and the second coil module is used for charging in conjunction with the first coil module.

19. The wireless charging system according to claim 18, wherein: The charger further comprises: The second magnetic isolation sheet is located on one side of the second coil module and is stacked with the second coil module.

20. The wireless charging system according to claim 19, wherein: The charger further comprises: 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.

21. The wireless charging system according to claim 20, wherein: The second magnet includes a central magnet and an outer ring magnet, the central magnet has a fifth surface and a sixth surface opposite to each other, and the direction in which the fifth surface points to the sixth surface is consistent with the direction in which the second magnetic isolation sheet points to the second coil module; The magnetization direction of the central magnet is parallel to the direction from the fifth surface to the sixth surface; The outer ring magnet is located on the circumferential side of the magnetization direction of the central magnet. The outer ring magnet is magnetized from the end away from the central magnet to the 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 on the central magnet is located.

22. The wireless charging system according to claim 21, wherein: There are multiple outer ring magnets, and the multiple outer ring magnets are arranged around the circumference of the central magnet in the magnetization direction.

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