CN117133531A

CN117133531A - Charging coil and electronic device

Info

Publication number: CN117133531A
Application number: CN202310417607.9A
Authority: CN
Inventors: 武渊; 王朝; 马骋宇; 马雷
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2023-04-14
Filing date: 2023-04-14
Publication date: 2023-11-28
Anticipated expiration: 2043-04-14
Also published as: CN117133531B

Abstract

The application discloses a charging coil and electronic equipment, relates to the technical field of charging, and is used for improving heat dissipation capacity of the charging coil and the electronic equipment. Wherein, the charging coil includes: the coil comprises a magnetic core, a coil body and a first heat conduction piece, wherein the magnetic core comprises a winding part; the coil body is wound on the winding part; the first heat conduction piece comprises a first heat conduction part and a second heat conduction part, the first heat conduction part is in heat conduction connection with the winding part, at least one part of the first heat conduction part is located between the coil body and the winding part, and the second heat conduction part is located outside the coil body.

Description

Charging coil and electronic device

Technical Field

The present application relates to the field of charging technologies, and in particular, to a charging coil and an electronic device.

Background

The wireless charging technology (wireless charging technology, WCT)) can utilize conductive media such as an electric field, a magnetic field, microwaves or laser to realize wireless transmission of electric energy, has the advantages of no constraint of a charging cable, no setting of a plugging interface and the like, and can enable the use environment of a user to be more concise and comfortable, so that the wireless charging technology is more and more widely used in electronic equipment.

However, in the wireless charging process, the charging coil in the electronic device inevitably generates heat, which affects the charging performance of the charging coil. Therefore, how to improve the heat dissipation capability of the charging coil is a technical problem to be solved.

Disclosure of Invention

The application provides a charging coil and electronic equipment, which are used for improving the heat dissipation capacity of the charging coil and the electronic equipment.

In order to achieve the above purpose, the application adopts the following technical scheme:

in a first aspect, the present application provides a charging coil comprising: the coil comprises a magnetic core, a coil body and a first heat conduction piece, wherein the magnetic core comprises a winding part; the coil body is wound on the winding part; the first heat conduction piece comprises a first heat conduction part and a second heat conduction part, the first heat conduction part is in heat conduction connection with the winding part, at least one part of the first heat conduction part is located between the coil body and the winding part, and the second heat conduction part is located outside the coil body. Wherein, one part of the first heat conduction part is positioned between the coil body and the winding part, or the whole first heat conduction part is positioned between the coil body and the winding part.

According to the charging coil provided by the application, the first heat conduction part and the winding part are in heat conduction connection through the first heat conduction piece comprising the first heat conduction part and the second heat conduction part, the second heat conduction part is in heat conduction connection with the first heat conduction part, at least one part of the first heat conduction part is arranged between the winding part and the coil body, the second heat conduction part is arranged at the outer side of the coil body, heat on the winding part can be transferred to the first heat conduction part and then transferred to the second heat conduction part at the outer side of the coil body through the first heat conduction part, and is emitted outwards through the second heat conduction part, so that heat on the winding part can be conveniently emitted, heat transferred from the coil body to the winding part can be reduced, the degree of heating of the winding part by the coil body is reduced, the temperature on the winding part can be reduced, the whole temperature of a magnetic core is more uniform, the conditions of cooling at two ends and middle heat of the magnetic core are avoided, the heat of the charging coil can be emitted outwards, the heat dissipation performance of the charging coil can be improved, the use speed of a user can be improved, and the use speed of the charging coil can be facilitated.

In a possible implementation manner of the first aspect, the winding portion includes a first surface, a second surface and a first peripheral surface, the first surface and the second surface are respectively located at two ends of the extending direction of the winding portion, the first peripheral surface is connected between the first surface and the second surface, and the coil body is wound around the first peripheral surface; the second heat conduction part comprises a first part, the first part is in heat conduction connection with the first heat conduction part, and the first part is positioned on the side facing the first surface. A specific structure of a charging coil is provided. Like this, can export the heat on the wire winding portion outside the coil body through first heat conduction spare, and when the coiling coil body, can avoid second heat conduction portion to take place to interfere with the coil body, can reduce charging coil's assembly degree of difficulty.

In a possible implementation manner of the first aspect, the first portion is fixedly connected to the first heat conducting portion. Like this, be convenient for realize the heat conduction connection between the first part of second heat conduction portion and the first heat conduction portion, and when the assembly, first heat conduction portion, the first part of second heat conduction portion can wholly assemble on the magnetic core, can simplify the assembly step between first heat conduction spare and the magnetic core, reduce the assembly degree of difficulty of first heat conduction spare and magnetic core.

In a possible implementation manner of the first aspect, the magnetic core includes a first end portion, the first end portion is connected to the first surface of the winding portion, and the first portion is connected in a heat conduction manner to the first end portion. Like this, can increase the heat conduction area between first heat-conducting piece and the magnetic core, on the one hand can extend the heat conduction route of magnetic core for heat on the wire winding portion can transmit to first heat-conducting portion, through first heat-conducting portion to first part transmission, outwards give off through first part again, simultaneously, heat on the first tip can transmit to first part, outwards give off through first part, can increase the heat conduction efficiency between first heat-conducting piece and the magnetic core, and then can promote charging coil's heat dispersion, make the bulk temperature of magnetic core more even, thereby can avoid the magnetic core to appear middle heat, the two cold circumstances.

In a possible implementation manner of the first aspect, the first portion is fixedly connected to the first end portion. Like this, first heat conduction spare can realize the fixed with the magnetic core through first heat conduction portion except that, can also realize with the fixed of magnetic core through the first part of second heat conduction portion, can increase the area of connection between first heat conduction spare and the magnetic core to can improve the joint strength between first heat conduction spare and the magnetic core, avoid first heat conduction spare to drop from the magnetic core. Thus, in addition to the heat conduction efficiency between the first heat conduction member and the magnetic core, the stability and reliability of the overall structure of the charging coil can be increased.

In a possible implementation manner of the first aspect, the winding portion includes a first fixing surface, and the first fixing surface faces the coil body; the first end part comprises a second fixing surface, and the orientation of the second fixing surface is the same as that of the first fixing surface; the first heat conduction part is fixedly connected to the first fixing surface, and the first part is fixedly connected to the second fixing surface. Thus, the fixed connection between the first part and the first end part is convenient to realize, and the assembly difficulty of the first heat conduction piece and the magnetic core can be reduced.

In a possible implementation manner of the first aspect, the first fixing surface is located on the first peripheral surface. Therefore, the first heat conduction part can be fixedly connected to the first peripheral surface of the winding part, and the structure is simple and the assembly is convenient.

In a possible implementation manner of the first aspect, the first end portion includes a first end face, a second end face, and a second peripheral face, the first end face is opposite to the second end face, the second end face is connected to the first surface, the second peripheral face is connected between the first end face and the second end face, and the second fixing face is located on the second peripheral face. Therefore, the first part of the second heat conduction part can be fixedly connected to the second peripheral surface of the first end part, and the structure is simple and the assembly is convenient.

In a possible implementation manner of the first aspect, the first end portion includes a first end face, a second end face and a second peripheral face, the first end face is opposite to the second end face, the second end face is connected to the first surface, the second peripheral face is connected between the first end face and the second end face, a first concave groove is formed in the second peripheral face, the first concave groove includes a first notch, a second notch and a first groove bottom wall, the first notch penetrates the second peripheral face, the second notch penetrates the second end face, the first groove bottom wall is opposite to the first notch, and the second fixing face is located on the second groove bottom wall. Thus, the first part of the second heat conduction part can be fixedly connected to the bottom wall of the first groove, the volume of the first end part can be increased, and meanwhile, the superposition size between the first part and the first end part can be reduced, so that the whole volume of the charging coil can be reduced while the magnetic field intensity of the charging coil is provided.

In a possible implementation manner of the first aspect, the shape of the first heat conducting portion is adapted to the shape of the first fixing surface, so that on one hand, the contact area between the winding portion and the first heat conducting portion can be increased, heat on the winding portion is conveniently transferred to the first heat conducting portion, heat conduction efficiency between the winding portion and the first heat conducting portion can be improved, and heat on the winding portion is conveniently emitted outwards. Meanwhile, the assembly between the first heat conduction part and the winding part is convenient to realize, and the assembly difficulty between the first heat conduction part and the winding part can be reduced, so that the assembly difficulty between the first heat conduction part and the magnetic core can be reduced.

In a possible implementation manner of the first aspect, the first portion is adapted to a shape of the second fixing surface. Therefore, on one hand, the contact area between the first part and the first end part can be increased, so that heat on the first end part can be conveniently transferred to the first part, and the heat on the charging coil can be conveniently emitted outwards. At the same time, the assembly between the first part and the first end is facilitated.

In a possible implementation manner of the first aspect, the first heat conducting portion is adapted to a shape of the first fixing surface, and the first portion is adapted to a shape of the second fixing surface.

In a possible implementation manner of the first aspect, the first fixing surface is coplanar with the second fixing surface. Optionally, the first fixing surface is connected to the first fixing surface and coplanar. In this way, the assembly between the first heat conduction piece and the magnetic core is convenient to realize, and the first heat conduction part and the first part can be arranged to be of a coplanar structure, so that the whole formed by the first heat conduction part and the first part is sheet-shaped, the structure of the first heat conduction piece can be simplified, and the processing cost of the first heat conduction piece is reduced.

In a possible implementation manner of the first aspect, the first fixing surface is recessed toward the central axis of the winding portion relative to the second fixing surface, and the first heat conducting member includes a first connection portion connected between the first heat conducting portion and the first portion. Another structure of the charging coil is provided.

In a possible implementation manner of the first aspect, the first connection portion is fixedly connected to the second end surface of the first end portion. Therefore, on one hand, the heat conduction area between the first heat conduction piece and the magnetic core can be increased, and the heat conduction efficiency between the magnetic core and the first heat conduction piece is improved, so that the heat dissipation performance of the charging coil can be improved. On the other hand, the connection area between the first heat conduction member and the magnetic core can be increased, and the connection reliability between the first heat conduction member and the magnetic core can be improved.

In a possible implementation manner of the first aspect, the first portion and the first heat conducting portion are in an integrally formed structure. Thus, the processing difficulty of the first heat conduction member can be reduced, and the connection strength between the first heat conduction part and the first part and the heat conduction efficiency between the first part and the first heat conduction part can be improved.

In a possible implementation manner of the first aspect, the winding portion includes a first surface, a second surface and a first peripheral surface, the first surface and the second surface are respectively located at two ends of the extending direction of the winding portion, the first peripheral surface is connected between the first surface and the second surface, and the coil body is wound around the first peripheral surface; the second heat conduction part comprises a second part, the second part is in heat conduction connection with the first heat conduction part, and the second part is positioned on the side, facing the second surface, of the second heat conduction part. Another specific structure of the charging coil is provided.

In a possible implementation manner of the first aspect, the first heat conducting portion includes a first portion and a second portion, the first portion is in heat conducting connection with the first heat conducting portion, and the second portion is in heat conducting connection with the first heat conducting portion, the first portion is located on a side towards which the first surface faces, and the second portion is located on a side towards which the second surface faces. Like this, heat on the first heat conduction portion can be simultaneously to first part and the transfer of second part, can increase the heat conduction route between first heat conduction portion and the second heat conduction portion, is favorable to improving the heat conduction efficiency between first heat conduction portion and the second heat conduction portion to heat on the wire winding portion can outwards distribute fast through first heat conduction piece, and then can improve charging coil's heat dispersion.

In a possible implementation manner of the first aspect, the magnetic core includes a second end portion, the second end portion is connected to the second surface of the winding portion, and the second portion is connected in a heat conduction manner to the second end portion. Like this, can increase the thermal conduction efficiency between first heat-conducting piece and the magnetic core, and then can promote charging coil's heat dispersion for the bulk temperature of magnetic core is more even, thereby can avoid the magnetic core to appear middle heat, the two cold circumstances.

In a possible implementation manner of the first aspect, the magnetic core includes a second end portion, the second end portion is connected to the second surface of the winding portion, and the second portion is fixedly connected to the second end portion. Like this, except can increase the heat conduction efficiency between first heat conduction spare and the magnetic core, can also increase the area of connection between first heat conduction spare and the magnetic core to can improve the joint strength between first heat conduction spare and the magnetic core, avoid first heat conduction spare to drop from the magnetic core, can improve charging coil overall structure's stability and reliability.

In a possible implementation manner of the first aspect, the winding portion includes a first fixing surface, and the first fixing surface faces the coil body; the second end part comprises a third fixing surface, and the orientation of the third fixing surface is the same as that of the first fixing surface; the first heat conduction part is fixedly connected to the first fixing surface, and the second part is fixedly connected to the third fixing surface. Thus, the fixed connection between the second part and the second end part is convenient to realize, and the assembly difficulty of the first heat conduction piece and the magnetic core can be reduced.

In a possible implementation manner of the first aspect, the third fixing surface is coplanar with the first fixing surface. Optionally, the third fixing surface is connected to the first fixing surface and coplanar. In this way, the assembly between the first heat conduction piece and the magnetic core is convenient to realize, and the first heat conduction part and the second part can be arranged to be of a coplanar structure, so that the whole formed by the first heat conduction part and the second part is sheet-shaped, the structure of the first heat conduction piece can be simplified, and the processing cost of the first heat conduction piece is reduced.

In one possible implementation manner of the first aspect, the first heat conducting portion is in a sheet shape. Therefore, the heat dissipation area of the first heat conduction part can be increased, and the superposition size between the first heat conduction part and the winding part can be reduced, so that the whole volume of the charging coil can be reduced, and the heat dissipation performance and the miniaturization design of the charging coil can be considered. In addition, the structure of the first heat conduction part can be simplified, and the processing is convenient.

In a possible implementation manner of the first aspect, the first portion is in a sheet shape. Therefore, the heat dissipation area of the first part can be increased, and the superposition size between the first part and the first end part can be reduced, so that the whole volume of the charging coil can be reduced, and the heat dissipation performance and the miniaturization design of the charging coil can be considered. In addition, the structure of the first part can be simplified, and the processing is convenient.

In a possible implementation manner of the first aspect, the second portion is in a sheet shape.

In one possible implementation manner of the first aspect, the first heat conducting member is in a sheet shape. Therefore, the structure of the first heat conduction piece can be simplified, the first heat conduction piece can be processed conveniently, and the heat dissipation area of the first heat conduction piece can be increased while the superposition size between the first heat conduction piece and the magnetic core can be reduced.

In a possible implementation manner of the first aspect, the second portion and the first heat conducting portion are in an integrally formed structure. Thus, the processing difficulty of the first heat conduction member can be reduced, and the connection strength between the first heat conduction part and the second part and the heat conduction efficiency between the first part and the first heat conduction part can be improved.

In one possible implementation manner of the first aspect, the first heat conducting member is an integral molding member. Like this, can reduce the processing degree of difficulty of first heat conduction spare, be convenient for realize the heat conduction connection between first heat conduction portion and the second heat conduction portion, and can improve the joint strength between first heat conduction portion and the second heat conduction portion.

In one possible implementation manner of the first aspect, the thickness of the first heat conducting portion is greater than or equal to 20 micrometers and less than or equal to 50 micrometers. Therefore, the heat dissipation capacity of the first heat conduction part can be ensured, the whole volume of the charging coil is reduced, and the eddy current loss of the first heat conduction part is reduced, so that the heat generated by the charging coil in the working process is reduced.

In one possible implementation manner of the first aspect, the thickness of the second heat conducting portion is greater than or equal to 20 micrometers and less than or equal to 50 micrometers. Therefore, the heat dissipation capacity of the second heat conduction part can be guaranteed, the whole volume of the charging coil is reduced, and the eddy current loss of the first heat conduction part is reduced, so that the heat generated by the charging coil in the working process is reduced.

In a possible implementation manner of the first aspect, the first heat conducting member has a heat conduction coefficient greater than that of the magnetic core. In this way, the heat dissipation performance of the charging coil can be improved.

In a possible implementation manner of the first aspect, the material of the first heat conducting part is graphite, metal or polymer material, and/or the material of the second heat conducting part is graphite, metal or polymer material. The materials have high heat conduction coefficient, and can effectively improve the heat dissipation performance of the charging coil.

In a possible implementation manner of the first aspect, the winding portion includes a first fixing surface, the first fixing surface faces the coil body, and the first heat conducting portion is fixedly connected to the first fixing surface; the second heat conduction part comprises a first part which is fixedly connected to the first surface. Another structure of the charging coil is provided.

In a possible implementation manner of the first aspect, the winding portion includes a first fixing surface, the first fixing surface faces the coil body, and the first heat conducting portion is fixedly connected to the first fixing surface; the second heat conduction part comprises a second part which is fixedly connected to the second surface. Another structure of the charging coil is provided.

In a possible implementation manner of the first aspect, the coil body is in thermally conductive connection with the first thermally conductive part. Thus, the heat on the coil body can be transferred to the first heat conduction part, then transferred to the second heat conduction part by the first heat conduction part, and dissipated outwards by the second heat conduction part. Therefore, the heat dissipation speed on the coil body can be improved, the temperature of the coil body can be reduced, heat transfer between the coil body and the winding part can be reduced, the degree of heating of the winding part by the coil body is reduced, the temperature of the magnetic core can be more uniform, the situation that two ends of the magnetic core are hot and the middle of the magnetic core is cool is avoided, and the heat dissipation performance of the charging coil can be improved.

In a possible implementation manner of the first aspect, the plurality of first heat conducting members is arranged in a circumferential direction of the magnetic core. Thus, the heat dissipation area of the charging coil can be increased, and the heat dissipation performance of the charging coil can be improved.

In a possible implementation manner of the first aspect, the magnetic core includes a first end portion, the first end portion is connected to one end of the extending direction of the winding portion, the first end portion includes a first end face and a second end face, the second end face is connected to the winding portion, the first end face is opposite to the second end face, the charging coil includes a second heat conducting member, and the second heat conducting member is fixedly connected to the first end face. The second heat conducting member may be shaped to fit the first end face. Therefore, the heat on the first end part can be outwards emitted through the second heat conduction piece, the heat dissipation rate of the charging coil can be further accelerated, and the heat dissipation performance of the charging coil is improved.

In a second aspect, the present application provides an electronic device comprising: the charging device comprises a shell and a charging coil, wherein the charging coil is arranged in the shell, and the charging coil is in any technical scheme.

In a possible implementation manner of the second aspect, the electronic device further includes: the radiating fin is arranged in the shell, the second heat conduction part is in heat conduction connection with the radiating fin, and/or the coil body is in heat conduction connection with the radiating fin. Therefore, the heat of the first heat conduction piece can be transferred to the radiating fin through the second heat conduction part and radiated outwards through the heat dissipation piece, and/or the heat on the coil body can be transferred to the radiating fin through the second heat conduction part and radiated outwards through the heat dissipation piece, so that the heat dissipation performance of the charging coil can be further improved.

In a possible implementation manner of the second aspect, the electronic device includes a circuit board, and the heat sink is fixedly connected to the circuit board. Therefore, heat on the charging coil can be transferred to the circuit board through the radiating fins, the circuit board is outwards radiated, the radiating area of the charging coil can be increased, and the radiating performance of the charging coil is improved.

In a possible implementation manner of the second aspect, the electronic device is an electronic stylus.

In a third aspect, the present application provides a method for processing a charging coil, including: providing a magnetic core including a winding portion; providing a first heat conduction member, wherein the first heat conduction member comprises a first heat conduction part and a second heat conduction part which are in heat conduction connection, and the first heat conduction part is fixedly connected with the winding part; the coil body is wound on the winding part, so that the first heat conduction part is positioned between the coil body and the winding part, and the second heat conduction part is positioned outside the coil body.

The technical effects caused by any implementation manner of the second aspect to the third aspect may refer to the technical effects caused by different implementation manners of the first aspect, which are not described herein.

Drawings

FIG. 1 is a schematic diagram of an electronic stylus according to some embodiments of the present application;

FIG. 2 is an exploded view of the electronic stylus of FIG. 1;

FIG. 3 is a perspective view of a charging coil in the electronic stylus of FIG. 2;

fig. 4 is an exploded view of the charging coil shown in fig. 3;

FIG. 5 is a cross-sectional view of the charging coil shown in FIG. 3 taken along line A-A;

fig. 6 is a schematic diagram of a wireless charging device for wirelessly charging an electronic handwriting pen according to some embodiments of the present application;

FIG. 7 is a schematic diagram illustrating an assembly of a charging coil, a heat sink and a circuit board in an electronic stylus according to some embodiments of the present application;

FIG. 8 is an exploded view of the charging coil, heat sink and circuit board shown in FIG. 7;

FIG. 9 is another assembled schematic view of the charging coil, heat sink and circuit board of FIG. 7;

fig. 10 is a schematic structural diagram of a charging coil according to other embodiments of the present application;

fig. 11 is an exploded view of the charging coil shown in fig. 10;

FIG. 12 is a cross-sectional view of the charging coil shown in FIG. 10 taken along line B-B;

FIG. 13 is a perspective view of a magnetic core in the charging coil of FIG. 10;

FIG. 14 is a cross-sectional view of the magnetic core shown in FIG. 13 taken along line C-C;

FIG. 15 is a schematic diagram illustrating an assembly of a magnetic core and a first heat conductive member in the charging coil shown in FIG. 10;

FIG. 16 is a cross-sectional view of the assembled schematic of FIG. 15 taken along line D-D;

FIG. 17 is an exploded view of the charging coil of FIG. 10 and a heat sink and circuit board of the electronic stylus;

FIG. 18 is another exploded view of the charging coil of FIG. 10 and a heat sink, circuit board of the electronic stylus;

FIG. 19 is a schematic diagram illustrating the assembly of the charging coil of FIG. 10 with a heat sink and a circuit board in the electronic stylus;

FIG. 20 is a cross-sectional view of a charging coil provided by further embodiments of the present application;

fig. 21 is an exploded view of the charging coil shown in fig. 20;

FIG. 22 is an enlarged view of the area A of the exploded view shown in FIG. 21;

FIG. 23 is an enlarged view of the area B of the exploded view shown in FIG. 21;

fig. 24 is a cross-sectional view of a charging coil provided by further embodiments of the present application;

FIG. 25 is a perspective view of a magnetic core in the charging coil of FIG. 24;

FIG. 26 is a cross-sectional view of the charging coil shown in FIG. 25 taken along line E-E;

fig. 27 is a cross-sectional view of a charging coil provided by further embodiments of the present application;

fig. 28 is a schematic structural diagram of a magnetic core and a first heat conducting member in a charging coil according to still another embodiment of the present application;

fig. 29 is a cross-sectional view of a charging coil provided by further embodiments of the present application;

FIG. 30 is a schematic diagram illustrating an assembly of the charging coil of FIG. 29 with a heat sink and a circuit board of the electronic writing pen;

Fig. 31 is a cross-sectional view of a charging coil provided by further embodiments of the present application;

FIG. 32 is a schematic diagram illustrating the assembly of the charging coil of FIG. 31 with a heat sink and a circuit board of an electronic pen;

fig. 33 is a flowchart of a processing method of a charging coil according to some embodiments of the present application.

Reference numerals:

100. an electronic stylus;

1. a housing; 11. a penholder; 11a, a first end; 11b, a second end; 12. a pen point; 12a, writing end; 12b, a connection end; 13. a rear cover; 2. a circuit board assembly; 21. a circuit board; 22. an electronic component; 3. a pressure sensor; 4. a battery;

5. a charging coil; 51. a magnetic core; 511. a winding part; 5111. a first surface; 5112. a second surface; 5113. a first outer peripheral surface; 5113a, a first fixation surface; 5113b, fourth fixation surface; 5113c, a fifth fixation surface; 512. a first end; 5121. a first end face; 5122. a second end face; 5123. a second outer peripheral surface; 5123a, a second fixation surface; 5124. a first concave groove; 5124a, a first notch; 5124b, a second notch; 5124c, a first trough bottom wall; 513. a second end; 5131. a third end face; 5132. a fourth end face; 5133. a third outer peripheral surface; 5133a, a third fixation surface; 5134. a second concave groove; 5134a, a third notch; 5134b, fourth notch; 5134c, a second trough bottom wall;

52. A coil body; 521. a cavity;

53. a first heat conductive member; 531. a first heat conduction part; 532. a second heat conduction part; 5321. a first portion; 5322. a second portion; 533. a first connection portion; 534. a second connecting portion; 54. a second heat conductive member; 55. a third heat conductive member;

6. a heat sink; 61. a first connection surface; 62. a second connection surface; 601. a body portion; 602. a first burring part; 603. a second burring part; 7. an adhesive structure; 8. a first magnetic structure;

200. a wireless charging device; 201. and the second magnetic structure.

Detailed Description

In embodiments of the present application, the terms "exemplary" or "such as" and the like are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In embodiments of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

In the description of the embodiment of the present application, "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In describing embodiments of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and for example, "connected" may be either detachably connected or non-detachably connected; may be directly connected or indirectly connected through an intermediate medium. Wherein, "fixedly connected" means that the relative positional relationship is unchanged after being connected with each other. "rotationally coupled" means coupled to each other and capable of relative rotation after coupling. "slidingly coupled" means coupled to each other and capable of sliding relative to each other after being coupled.

In the description of embodiments of the present application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the description of embodiments of the application, the terms "oriented in unison", "perpendicular", "parallel", "equal" include the stated cases and cases similar to the stated cases, the range of which is within acceptable deviation ranges as determined by one of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system). For example, "parallel" includes absolute parallel and approximately parallel, where the acceptable deviation range for approximately parallel may be, for example, a deviation within 5 °; "vertical" includes absolute vertical and near vertical, where the acceptable deviation range for near vertical may also be deviations within 5 °, for example. "equal" includes absolute equal and approximately equal, where the difference between the two, which may be equal, for example, is less than or equal to 5% of either of them within an acceptable deviation of approximately equal.

For ease of understanding, before describing the charging coil and the electronic device in detail in the embodiments of the present application, description will be first made of related terms related to the embodiments of the present application.

Thermal conductivity coefficient: refers to the heat that is directly conducted per unit section, per unit length of material at a unit temperature difference and per unit time. The unit of the thermal conductivity is W/(m×k). The larger the thermal conductivity, the better the thermal conductivity.

Axial direction: it is understood that the direction in which the central axis of the described component is located may be equivalent to the extending direction of the described component. For example, the axial direction of the core may be understood as the direction from the first end portion to the winding portion and then further to the second end portion. The axial direction of the winding portion may be understood as a direction extending from the first surface of the winding portion to the second surface of the winding portion.

And (3) circumferential direction: it is understood as a circumferential direction around the axial direction.

Radial direction: it is understood as a direction perpendicular to the axial direction.

Direction "out": it is understood to be the direction away from the center of the component being described.

Direction "in": it is understood to be a direction toward the center of the component being described.

Thermally conductive connection: refers to a connection having heat transfer between two components.

Cross section: refers to a section obtained by sectioning the component with a plane perpendicular to the direction in which the component extends.

The embodiment of the application provides electronic equipment, which comprises a charging coil and has a wireless charging function. In order to improve the heat dissipation performance of a charging coil in electronic equipment, the charging coil in the embodiment of the application is provided with the first heat conduction piece comprising the first heat conduction part and the second heat conduction part, so that the first heat conduction part is in heat conduction connection with the winding part, the second heat conduction part is in heat conduction connection with the first heat conduction part, at least one part of the first heat conduction part is arranged between the winding part and the coil body, the second heat conduction part is arranged on the outer side of the coil body, the heat on the winding part can be led out through the first heat conduction piece, the heat dissipation on the winding part is convenient, the heat transferred by the coil body to the winding part can be reduced, the degree of the winding part heated by the coil body is reduced, the temperature on the winding part can be reduced, the whole temperature of a magnetic core is more uniform, the condition that two ends of the magnetic core are cool and middle heat is avoided, the heat of the charging coil is beneficial to radiating outwards, the heat dissipation performance of the charging coil can be improved, the charging speed of the charging coil can be improved, and the use experience of a user is beneficial to being improved.

Specifically, the electronic device in the embodiment of the present application includes, but is not limited to, an electronic stylus (may also be referred to as a stylus, a smart pen, etc.), a wearable device, a mobile phone, a tablet (tablet personal computer), a laptop (laptop computer), a personal digital assistant (personal digital assistant, PDA), a personal computer, a notebook computer, a walkman, a radio, an electronic reader, a smart screen, a television, a wireless keyboard, a wireless charging pen box, a wireless charging stand, a transformer, etc. Wherein the wearable device includes, but is not limited to, a smart watch, a smart bracelet, a smart garment, smart glasses, and a smart headset.

In the following embodiments, an electronic device is described as an example of an electronic stylus, but this should not be construed as limiting the application.

Referring to fig. 1, fig. 1 is a schematic diagram of an electronic stylus 100 according to some embodiments of the application. The electronic stylus 100 may be used to provide input to other electronic devices, such as touch screen devices. The touch screen device includes a touch screen. Exemplary touch screen devices include, but are not limited to, tablet computers, cell phones, notebook computers, electronic readers, and the like. The touch screen device performs an operation responsive to an input of the electronic pen 100 based on the input. For example, the user may perform clicking, writing, stroking, etc. operations on the touch screen using the electronic stylus 100.

The electronic stylus 100 and other electronic devices such as a touch screen device can be interconnected through a communication network, so as to realize interaction of wireless signals. The communication network may be, but is not limited to: wi-Fi hotspot networks, wi-Fi peer-to-peer (P2P) networks, bluetooth networks, zigbee networks, or near field communication (near field communication, NFC) networks.

The electronic stylus 100 may be an inductive pen or a capacitive pen. Capacitive pens may include passive capacitive pens and active capacitive pens. Passive capacitive pens may be referred to as passive capacitive pens and active capacitive pens may be referred to as active capacitive pens.

Referring to fig. 1 in combination with fig. 2, fig. 2 is an exploded view of the electronic stylus 100 shown in fig. 1. The electronic stylus 100 (i.e., an electronic device) includes a housing 1, a circuit board assembly 2, a pressure sensor 3, a first magnetic attraction structure 8, a battery 4, and a charging coil 5.

It will be appreciated that fig. 1, 2 and the accompanying drawings below are only illustrative of some of the components that electronic stylus 100 includes, and that the actual shape, actual size, actual location and actual configuration of these components are not limited by fig. 1, 2 and the accompanying drawings below. For example, in other embodiments, the electronic stylus may further include a microphone, speaker, audio generator, vibrator, camera, data port, and other devices, depending on the actual needs.

Referring to fig. 2, the casing 1 includes a barrel 11, a nib 12, and a rear cover 13. The barrel 11 has a long strip shape, and the barrel 11 includes a first end 11a and a second end 11b opposite to each other in a length direction (e.g., a direction e1 in fig. 1) thereof. The interior of the barrel 11 is hollow to form an accommodation space in which the circuit board 21, the battery 4, the charging coil 5, and the like are disposed. The material of the barrel 11 includes, but is not limited to, metal or plastic.

Referring to fig. 1 and 2, the nib 12 is disposed at the first end 11a of the barrel 11. The nib 12 is adapted to cooperate with a contact surface (e.g., a touch screen) external to the electronic stylus 100. Nib 12 includes oppositely disposed writing end 12a and connecting end 12b. When the user holds the electronic stylus 100, the writing end 12a of the pen tip 12 may be used to contact the touch screen and input information to the touch screen. The writing end 12a of the nib 12 may be provided as a spherical surface to improve smoothness of sliding of the nib 12.

The rear cover 13 is disposed at the second end 11b of the barrel 11. The rear cover 13 and the pen holder 11 can be connected in a plugging, clamping, threaded connection, bonding and other modes. It will be appreciated that in other embodiments, the rear cover 13 and the barrel 11 may be integrally formed. Alternatively, in still other embodiments, the rear cover 13 may be replaced with the nib 12, in which case the electronic stylus 100 is a dual-nib electronic stylus 100.

Referring to fig. 2, the circuit board assembly 2 includes a circuit board 21 and electronic components 22. The circuit board 21 is used for integrating the electronic components 22. The circuit board 21 may be used to achieve electrical connection between various electronic components 22 inside the electronic stylus 100, and the circuit board 21 may be used to perform signal control, data signal processing, and the like on the electronic components 22. The circuit board 21 includes, but is not limited to, a printed circuit board (printed circuit board, PCB). The circuit board 21 may be a hard circuit board, a flexible circuit board, or a hard-soft combined circuit board. The circuit board 21 may be fixed in the housing 1 by means of gluing, clamping, soldering, or the like.

The electronic components 22 include, but are not limited to, processors, wireless communication modules, and the like. Wherein the processor may include storage and processing circuitry for supporting the operation of the electronic stylus 100. The storage and processing circuitry may include storage devices such as non-volatile memory (e.g., flash memory or other electrically programmable read-only memory configured as a solid state drive), volatile memory (e.g., static or dynamic random access memory), and the like. Processing circuitry in the processor may be used to control the operation of the electronic stylus 100. The processing circuitry may be based on one or more microprocessors, microcontrollers, digital signal processors, baseband processors, power management units, audio chips, application specific integrated circuits, and the like.

The wireless communication module is used for supporting data exchange of wireless communication between the electronic stylus 100 and other electronic devices such as touch screen devices, including Bluetooth (BT), global navigation satellite system (global navigation satellite system, GNSS), wireless local area network (wireless local area networks, WLAN) (e.g. wireless fidelity (wireless fidelity, wi-Fi) network), frequency modulation (frequency modulation, FM), near field wireless communication technology (near field communication, NFC), infrared technology (IR), etc.

In some embodiments, the wireless communication module may include a bluetooth chip. The electronic stylus 100 may pair with and establish a wireless connection between the bluetooth chip and bluetooth chips of other electronic devices including, but not limited to, a touch screen device, so as to enable wireless communication between the electronic stylus 100 and the other electronic devices such as the touch screen device through the wireless connection. In addition, the wireless communication module may further include an antenna, and the wireless communication module may receive electromagnetic waves via the antenna, frequency-modulate and filter the electromagnetic wave signals, and transmit the processed signals to the processor. The wireless communication module can also receive signals to be transmitted from the processor, frequency modulate the signals, amplify the signals, convert the signals into electromagnetic waves through the antenna and radiate the electromagnetic waves.

The pressure sensor 3 may be used to obtain a motion trace signal of the pen tip 12 of the electronic stylus 100, and to sense a pressure signal applied to the pen tip 12 of the electronic stylus 100 by a contact surface (e.g., a touch screen) that cooperates with the electronic stylus 100. The pressure sensor 3 may include at least one of a resistive pressure sensor, an inductive pressure sensor, and a capacitive pressure sensor.

In some embodiments, referring to fig. 2, the pressure sensor 3 may be disposed at the tip 12 of the electronic stylus 100, and the pressure sensor 3 is electrically connected to the processor. Specifically, the inside of the pen tip 12 has a housing chamber in which the pressure sensor 3 is disposed. The processor can adjust the thickness of the line when the electronic stylus 100 writes according to the pressure detected by the pressure sensor 3. It is to be understood that the setting position of the pressure sensor 3 is not limited thereto, as long as the pressure sensor 3 can detect the pressure at the writing end 12a of the pen tip 12. For example, in other embodiments, the pressure sensor 3 may also be disposed within the barrel 11.

The battery 4 is used to provide power to the circuit board 21. Battery 4 may include, but is not limited to, a nickel cadmium battery, a nickel hydrogen battery, a lithium battery, an alkaline battery, or other types of batteries. In addition, the number of the batteries 4 in the embodiment of the present application may be plural or one.

In some embodiments, battery 4 comprises a rechargeable battery, and electronic stylus 100 may charge battery 4 by wireless charging. Specifically, the battery 4 of the electronic pen 100 may be wirelessly charged by a wireless charging device. The electronic stylus 100 may be charged with the wireless charging device based on a gas (Qi) protocol.

The charging coil 5 of the electronic stylus 100 is used for coupling with a charging coil in a wireless charging device to generate an induced current so as to realize transmission of electric energy. The charging coil 5 of the electronic stylus 100 is disposed in the housing 1. Specifically, the charging coil 5 may be disposed in the barrel 11, and the charging coil 5 may be electrically connected to the circuit board 21.

Referring to fig. 3-4, fig. 3 is a perspective view of the charging coil 5 in the electronic stylus 100 shown in fig. 2, and fig. 4 is an exploded view of the charging coil 5 shown in fig. 3. The charging coil 5 is a magnetic rod coil. Specifically, the charging coil 5 includes a magnetic core 51 and a coil body 52 wound around the magnetic core 51.

The magnetic core 51 is used to concentrate magnetic lines of force, and can improve energy transmission efficiency. To reduce the loss of the magnetic core 51, the magnetic core 51 may be made of a soft magnetic material. For example, the magnetic core 51 may be made of ferrite, amorphous alloy, or iron-nickel soft magnetic alloy. Referring to fig. 3 and 4, when the magnetic core 51 is in a long strip shape and the charging coil 5 is assembled into the housing 1 of the electronic stylus 100, the length direction (e.g., e2 direction in fig. 3 and 4) of the magnetic core 51 may be identical to the length direction of the housing 1.

Referring to fig. 4 and 5, fig. 5 is a cross-sectional view of the charging coil 5 shown in fig. 3 at line A-A. The core 51 includes a first end portion 512, a winding portion 511, and a second end portion 513 connected in this order in the length direction thereof. The winding portion 511 is connected between the first end portion 512 and the second end portion 513. Specifically, referring to fig. 5, the winding portion 511 includes a first surface 5111, a second surface 5112, and a first outer peripheral surface 5113. The first surface 5111 and the second surface 5112 are respectively located at both ends of the extension direction of the winding portion 511. The first outer circumferential surface 5113 is connected between the first surface 5111 and the second surface 5112. The first end portion 512 is connected to the first surface 5111 of the winding portion 511, and the second end portion 513 is connected to the second surface 5112 of the winding portion 511.

It will be appreciated that in other embodiments, the core 51 may include the winding portion 511 instead of the first end portion 512 and the second end portion 513; alternatively, the magnetic core 51 may include the winding portion 511 and the first end portion 512, without including the second end portion 513; alternatively, the magnetic core 51 may further include the winding portion 511 and the second end portion 513 without including the first end portion 512.

The coil body 52 is wound around the winding portion 511. Specifically, the coil body 52 may be wound around the outer side of the winding portion 511 in the extending direction of the winding portion 511. Referring to fig. 5, the coil body 52 may be wound around the first outer circumferential surface 5113 of the winding portion 511. The coil body 52 may have a solenoid shape. In some embodiments, the coil body 52 includes a conductor and an insulating layer wrapped over the conductor. The conductor can be a copper wire, an aluminum wire, a gold wire or the like. The insulating layer is used for insulating the conductor. The insulating layer may be an insulating varnish. That is, the coil body 52 is an enamel wire. By way of example, the coil body 52 may include, but is not limited to, acetal enamelled wire, polyurethane enamelled wire, polyesterimide/polyamide composite enamelled wire, and the like. Thus, the insulation performance of the coil body 52 can be ensured, and the safety of the charging coil 5 can be improved. It will be appreciated that in other embodiments, the coil body 52 may be directly wound from a conductor.

Referring to fig. 6, fig. 6 is a schematic diagram illustrating a wireless charging device 200 according to some embodiments of the application for wirelessly charging an electronic stylus 100. The wireless charging device 200 in this embodiment is a tablet computer. It is understood that the structure of the wireless charging device 200 is not limited thereto. In other embodiments, the wireless charging device 200 may also be an electronic device such as a mobile phone, a notebook computer, a wireless keyboard, a wireless charging stand, a wireless charging pen box, a wireless charging magnetic bar, etc.

The structure of the charging coil 5 in the wireless charging device 200 may be the same as that of the charging coil 5 in the electronic stylus 100, and specifically, the charging coil 5 in the wireless charging device 200 is also a magnetic rod coil, which will not be described in detail herein. Of course, it is understood that in other embodiments, the structure of the charging coil 5 in the wireless charging device 200 may also be different from the structure of the charging coil 5 in the electronic stylus 100. For example, the charging coil 5 in the wireless charging device 200 may also be a planar coil.

In the wireless charging process, the charging coil 5 in the electronic stylus 100 may be used as a radio receiving end, and the charging coil 5 in the wireless charging device 200 may be used as a radio transmitting end. That is, the charging coil 5 in the electronic stylus 100 may be used as a Reception (RX) coil, and the charging coil 5 in the wireless charging device 200 may be used as a Transmission (TX) coil.

Specifically, referring to fig. 6, during the wireless charging process, an alternating current I is introduced into the transmitting coil (i.e., the charging coil 5 in the wireless charging device 200) ₁ In this case, an alternating magnetic field H is generated around the transmitting coil, whose magnetic induction lines at least partially pass through the region surrounded by the receiving coil (i.e., the charging coil 5 in the electronic stylus 100), on the basis of which an alternating current I can be induced in the receiving coil according to the principle of electromagnetic induction ₂ Thereby, wireless transmission of electric energy can be realized, and wireless charging of the battery 4 can be performed. The charging mode does not need charging wire connection, so that the charging device is convenient to use and safe and reliable.

In some embodiments of the present application, in order to enable the position alignment accuracy of the charging coil 5 on the electronic handwriting pen 100 and the charging coil 5 in the wireless charging device 200, the electronic handwriting pen 100 is provided with a first magnetic attraction structure 8, and the wireless charging device 200 is provided with a second magnetic attraction structure 201, where the first magnetic attraction structure 8 and the second magnetic attraction structure 201 can be magnetically attracted and matched. In this way, in the charging process, the electronic stylus 100 can be fixed on the wireless charging device 200 through the magnetic attraction matching of the first magnetic attraction structure 8 and the second magnetic attraction structure 201, so that the position alignment accuracy of the charging coil 5 in the charging device 200 and the charging coil 5 in the wireless charging device 200 can be improved, the alignment difficulty of the charging coil 5 in the electronic stylus 100 and the charging coil 5 in the wireless charging device 200 can be reduced, the connection reliability of the electronic stylus 100 and the wireless charging device 200 can be improved, and the separation of the electronic stylus 100 and the wireless charging device 200 in the charging process can be avoided.

In some embodiments, the first magnetic attraction structure 8 and the second magnetic attraction structure 201 may be halbach array magnets. The halbach array magnet can converge magnetic force lines on one side of the magnet and weaken the magnetic force lines on the other side by arranging the magnets in different magnetizing directions according to a certain rule, so that a relatively ideal unilateral magnetic field is obtained. In this way, by setting the first magnetic attraction structure 8 and the second magnetic attraction structure 201 to halbach array magnets, the magnetic attraction force between the first magnetic attraction structure 8 and the second magnetic attraction structure 201 can be improved, which is beneficial to improving the connection reliability between the electronic stylus 100 and the wireless charging device 200.

In some embodiments, referring to fig. 6, the number of the first magnetic attraction structures 8 is two, and the two first magnetic attraction structures 8 may be symmetrically disposed on opposite sides of the charging coil 5 of the electronic stylus 100. The first magnetic attraction structure 8 may be fixedly connected to the housing 1.

In the above-mentioned charging process, the charging coil 5 inevitably generates heat, and because the internal space of electronic devices such as the electronic stylus 100 and the wireless charging device 200 is limited, and the structure is closed, the heat cannot be timely emitted, and in the charging process, the charging current is limited due to larger heating, so that the charging speed is affected.

In some embodiments, in order to improve the heat dissipation performance of the charging coil 5, the electronic stylus 100 is provided with a heat sink 6. Referring to fig. 7-8, fig. 7 is an assembly schematic diagram of the charging coil 5, the heat sink 6 and the circuit board 21 in the electronic stylus 100 according to some embodiments of the present application, and fig. 8 is an exploded view of the charging coil 5, the heat sink 6 and the circuit board 21 shown in fig. 7.

Referring to fig. 7 and 8, the charging coil 5 is fixedly connected to the heat sink 6. The heat sink 6 may be flat, and the heat sink 6 is disposed at one side of the charging coil 5. Specifically, the heat sink 6 is located on the same side of the coil body 52 and the magnetic core 51. Referring to fig. 8, the heat sink 6 includes a first connecting surface 61 and a second connecting surface 62 opposite to each other. The charging coil 5 may be fixedly connected to the first connection surface 61. Specifically, the magnetic core 51 and the coil body 52 may be both fixedly connected to the first connection surface 61. The charging coil 5 may be fixedly connected to the circuit board 21 of the electronic pen 100 by means of the second connection surface 62 of the heat sink 6.

Referring to fig. 9, fig. 9 is another assembly schematic diagram of the charging coil 5, the heat dissipation member and the circuit board 21 shown in fig. 7. The charging coil 5 and the heat sink 6 may be connected by an adhesive structure 7. The bonding structure 7 may be a heat conductive adhesive, a hot melt adhesive, a double sided adhesive, etc. The heat sink 6 and the circuit board 21 may also be connected by an adhesive structure 7. Of course, in other embodiments, the heat sink 6 and the circuit board 21 may be fixedly connected by soldering or the like.

Like this, be convenient for realize the electricity between charging coil 5 and the circuit board 21 and be connected, and the heat on the charging coil 5 except can directly distribute to the air in, still can transmit to the circuit board 21 through fin 6 to outwards distribute through the circuit board 21, because the area of circuit board 21 is great, can increase the heat radiating area of charging coil 5, be favorable to improving the heat dispersion of charging coil 5, thereby can improve the charge rate.

In order to ensure the heat dissipation capability and heat conduction capability of the heat sink 6, the heat sink 6 may be made of a material with a high heat conduction coefficient. In some embodiments, the material of the heat sink 6 is sheet metal.

The heat conduction performance of metal is good and structural strength is high, through setting up fin 6 into the sheetmetal, on the one hand can improve the heat dispersion of charging coil 5, on the other hand can guarantee the support ability of fin 6, can strengthen charging coil 5 through the heating panel, thereby can promote the ability of charging coil 5 to resist external force effectively, can improve the shock resistance and the anti-drop performance of charging coil 5, magnetic core 51 in the charging coil 5 can be avoided, coil body 52 etc. is damaged under the scene such as falling, striking, and then can improve the reliability of charging coil 5, the life of extension charging coil 5, on the other hand is favorable to reducing the thickness of fin 6, thereby can reduce the overall thickness of charging coil 5, be favorable to reducing the overall volume of charging coil 5, the assembly of charging coil 5 in electronic equipment such as limited electronic handwriting pen 100 in space of being convenient for.

In some embodiments, the material of the heat sink 6 may be copper. That is, the heat sink 6 may be a copper sheet (may also be referred to as a red copper sheet). The heat conduction coefficient of copper is 385W/(m.times.K), the heat conduction performance is good, the structural strength is high, the supporting capacity of the radiating fin 6 can be ensured while the whole radiating capacity of the charging coil 5 is improved, the reinforcing effect of the radiating plate is improved, the capacity of the charging coil 5 for resisting external force can be effectively improved, the reliability of the charging coil 5 can be further improved, and the service life of the charging coil 5 is prolonged. Of course, the material of the heat sink 6 is not limited thereto, and in other embodiments, the material of the heat sink 6 may be gold, silver, aluminum, stainless steel, copper alloy, aluminum alloy, or the like.

In the above embodiment, the heat dissipation fin 6 is disposed, so that the heat dissipation of the coil body 52 is facilitated, and the heat dissipation performance of the charging coil 5 can be improved. However, when the charging coil 5 is operated, heat is generated in the core 51 due to eddy current loss in addition to the heat generated in the coil body 52.

Referring to fig. 9, in this embodiment, the heat dissipation modes of the first end 512 and the second end 513 of the magnetic core 51 include: heat dissipation mode one: directly radiating heat to air, and the second radiating mode is as follows: and heat conduction and dissipation are carried out. The paths of heat conduction and heat dissipation in the first end portion 512 and the second end portion 513 are the same, and a heat conduction and dissipation path in the first end portion 512 will be described as an example. Referring to fig. 9, the heat conduction and dissipation paths of the first end portion 512 are: first end 512 of core 51→heat sink 6→circuit board 21. That is, heat on the first end 512 and the second end 513 of the magnetic core 51 may be transferred to the heat sink 6, and transferred to the circuit board 21 via the heat sink 6. Since the thermal conductivity of air is low, only 0.0267W/(m×k), the heat conduction and dissipation is the main heat dissipation mode of the first end portion 512 and the second end portion 513.

In this embodiment, since the winding portion 511 of the magnetic core 51 is connected between the first end portion 512 and the second end portion 513, and the winding portion 511 of the magnetic core 51 is surrounded by the coil body 52, heat on the winding portion 511 can be dissipated outwards only by means of heat conduction and dissipation. Specifically, the heat dissipation path of the winding portion 511 of the core 51 includes:

heat dissipation path 1: winding portion 511 of core 51→coil body 52→heat sink 6→circuit board 21. That is, the heat of the winding portion 511 is transferred to the coil body 52, and is transferred to the heat sink 6 through the coil body 52 and then to the circuit board 21 through the heat sink 6.

Heat dissipation path 2: the winding portion 511 of the magnetic core 51→the first end portion 512 of the magnetic core 51→the second end portion 513 of the magnetic core 51→the heat sink 6→the circuit board 21. That is, heat at the winding portion 511 of the magnetic core 51 may be transferred to the first end portion 512 of the magnetic core 51 and the second end portion 513 of the magnetic core 51, to the heat sink 6 via the first end portion 512 and the second end portion 513, and to the circuit board 21 via the heat sink 6.

Heat dissipation path 3: winding portion 511 of magnetic core 51→first end portion 512 of magnetic core 51 and second end portion 513 of magnetic core 51→air. That is, heat at the winding portion 511 of the magnetic core 51 can be transferred to the first end portion 512 of the magnetic core 51 and the second end portion 513 of the magnetic core 51, and emitted to the air through the first end portion 512 and the second end portion 513.

However, for the heat dissipation path 1, since the coil body 52 is the heat source, when the temperature of the coil body 52 is higher than the temperature of the coil portion 511, the coil portion 511 cannot transfer heat to the coil body 52, but absorbs heat of the coil body 52, so that the coil portion 511 is heated by the coil body 52, and the heat on the coil portion 511 cannot be dissipated outwards through the heat dissipation path 1.

For the heat dissipation paths 2 and 3, since the heat conduction coefficient of the magnetic core 51 is low, for example, when the material of the magnetic core 51 is manganese zinc ferrite (MnZn ferrite), the heat conduction coefficient of the magnetic core 51 is only 13.56W/(m×k), and the heat conduction efficiency between the winding portion 511 and the first end portion 512 and the heat dissipation paths 511 and the second end portion 513 is low, so that the heat on the winding portion 511 cannot be rapidly dissipated through the heat dissipation paths 2 and 3. Therefore, the heat on the winding part 511 of the magnetic core 51 cannot be rapidly emitted outwards, so that the magnetic core 51 presents a state of middle heat and two cool ends, the temperature distribution of the magnetic core 51 is uneven, the heat emission on the charging coil 5 is not facilitated, the heat dissipation performance of the charging coil 5 is poor, and the charging performance of the charging coil 5 is affected.

In other embodiments, when the magnetic core 51 does not include the first end portion 512 and/or the second end portion 513, the first surface 5111 and/or the second surface 5112 of the winding portion 511 are exposed, and in this case, although the heat on the winding portion 511 can be dissipated to the air through the first surface 5111 and/or the second surface 5112 in addition to the heat dissipation through heat conduction, the heat on the winding portion 511 cannot be dissipated to the outside quickly through heat conduction and dissipation, so that the heat dissipation performance of the charging coil 5 is still poor, and the charging performance of the charging coil 5 is affected.

In order to improve the heat dissipation performance of the charging coil 5 and reduce the temperature of the charging coil 5, refer to fig. 10-12, fig. 10 is a schematic structural diagram of the charging coil 5 according to other embodiments of the present application, and fig. 11 is an exploded view of the charging coil 5 shown in fig. 10. The charging coil 5 in the present embodiment includes a magnetic core 51, a coil body 52, and a first heat conductive member 53.

Referring to fig. 11 in combination with fig. 12, fig. 12 is a sectional view of the charging coil 5 shown in fig. 10 at line B-B. The core 51 includes a winding portion 511, and the coil body 52 is wound around the winding portion 511. Illustratively, the coil body 52 is wound around the circumferential outer side of the winding portion 511. Referring to fig. 11, a cavity 521 is defined in the coil body 52, and the winding portion 511 may be located in the cavity 521.

With continued reference to fig. 11-12, the first heat conductive member 53 includes a first heat conductive portion 531 and a second heat conductive portion 532, and the first heat conductive portion 531 and the second heat conductive portion 532 are thermally connected. Specifically, there are various ways of implementing the heat conduction connection between the first heat conduction portion 531 and the second heat conduction portion 532, for example, the first heat conduction portion 531 and the second heat conduction portion 532 may be directly connected, or the first heat conduction portion 531 and the second heat conduction portion 532 may be indirectly connected through other heat conduction structures. Thus, the heat of the first heat conductive portion 531 can be transferred to the second heat conductive portion 532.

Referring to fig. 10 and 12, the first heat conductive portion 531 is connected to the winding portion 511 in a heat conductive manner, at least a portion of the first heat conductive portion 531 is located between the coil body 52 and the winding portion 511, and the second heat conductive portion 532 is located outside the coil body 52. Wherein, a part of the first heat conductive portion 531 is located between the coil body 52 and the winding portion 511, or the whole first heat conductive portion 531 is located between the coil body 52 and the winding portion 511.

Specifically, referring to fig. 12, the first heat conductive portion 531 is located radially inward of the coil body 52, that is, at least a portion of the first heat conductive portion 531 is located in the cavity 521. The second heat conducting portion 532 is located outside the cavity 521. It is understood that the second heat conducting portion 532 may be located axially outside the coil body 52 or radially outside the coil body 52. Wherein the axial direction of the coil body 52 may be the same as the axial direction of the winding part 511.

In this way, referring to fig. 12, on one hand, the heat on the winding portion 511 of the magnetic core 51 can be transferred to the first heat conducting portion 531, and then transferred to the second heat conducting portion 532 located outside the coil body 52 through the first heat conducting portion 531, and is emitted outwards through the second heat conducting portion 532, so that the heat on the winding portion 511 can be led out through the first heat conducting member 53, the heat on the winding portion 511 can be conveniently emitted, the temperature on the winding portion 511 can be reduced, the overall temperature of the magnetic core 51 is more uniform, and the situation that two ends of the magnetic core 51 are cool and middle heat is avoided; on the other hand, since the first heat conducting portion 531 is located between the winding portion 511 and the coil body 52, heat on the coil body 52 can be transferred to the second heat conducting portion 532 through the first heat conducting portion 531, and the heat of the coil body 52 can be reduced through the outward emission of the second heat conducting portion 532, so that the heat transfer between the coil body 52 and the winding portion 511 can be reduced, the degree of heating of the winding portion 511 by the coil body 52 can be reduced, the temperature on the winding portion 511 of the magnetic core 51 can be further reduced, the temperature distribution on the magnetic core 51 is more uniform, the outward rapid emission of heat of the charging coil 5 is facilitated, the heat dissipation performance of the charging coil 5 can be improved, the charging speed of the charging coil 5 can be improved, and the use experience of a user can be improved.

The specific structure of the charging coil 5 in the embodiment of the present application is described in detail below.

Referring to fig. 13, fig. 13 is a perspective view of a magnetic core 51 in the charging coil 5 shown in fig. 10. The magnetic core 51 includes a first end portion 512, a winding portion 511, and a second end portion 513. The winding portion 511 is connected between the first end portion 512 and the second end portion 513.

In some embodiments, referring to fig. 14, fig. 14 is a cross-sectional view of the magnetic core 51 shown in fig. 13 at line C-C. The winding portion 511 includes a first surface 5111, a second surface 5112, and a first outer peripheral surface 5113. The first surface 5111 and the second surface 5112 face each other in the extending direction of the winding portion 511, and the first outer circumferential surface 5113 is connected between the first surface 5111 and the second surface 5112. The first outer circumferential surface 5113 is formed as an annular surface. The extending direction of the winding portion 511 refers to a direction extending from the first surface 5111 to the second surface 5112 of the winding portion 511 or a direction extending from the second surface 5112 to the first surface 5111 of the winding portion 511.

Referring to fig. 13, the first outer peripheral surface 5133 includes a plurality of first side surfaces connected end to end in sequence, that is, the first outer peripheral surface 5133 is formed by enclosing a plurality of first side surfaces. The plurality of first sides may each be formed as a plane, or the plurality of first sides may each be formed as an arcuate surface, or a portion of the plurality of first sides may be formed as a plane, and another portion of the plurality of first sides may be formed as an arcuate surface.

Wherein, the "plurality" in the embodiments of the present application refers to two or more. For example, in the embodiment shown in fig. 13, the first side is four. In other embodiments, the number of first sides may also be two, three, five, six, etc.

In this embodiment, the winding portion 511 has a long columnar shape. The cross-sectional shape of the winding portion 511 may be rectangular. Simple structure and convenient processing. It will be appreciated that in other embodiments, the cross-sectional shape of the winding portion 511 may also be square, circular, oval, trapezoidal, pentagonal, hexagonal or more, irregular, etc. The shape of the winding portion 511 is not limited to the elongated columnar shape, and in other embodiments, the winding portion 511 may have an L-shape, a U-shape, or the like.

Referring to fig. 14, the first end 512 is connected to one end of the winding portion 511 in the extending direction. Specifically, the first end portion 512 includes a first end face 5121, a second end face 5122, and a second outer peripheral face 5123. The first end face 5121 and the second end face 5122 are opposite. The first end portion 512 may be fixedly connected to the winding portion 511 by means of the second end face 5122.

In some embodiments, the first end portion 512 is integrally formed with the winding portion 511. In this way, the assembling step between the first end portion 512 and the winding portion 511 can be omitted, not only the structure of the magnetic core 51 can be simplified, but also the connection reliability between the first end portion 512 and the winding portion 511 can be improved, which is advantageous in improving the overall structural strength of the magnetic core 51. It should be understood that in other embodiments, the first end portion 512 and the winding portion 511 may be separate members, that is, the first end portion 512 and the winding portion 511 may be formed by separate processes and then fixedly connected by gluing, clamping, screwing, etc.

With continued reference to fig. 14, the second outer circumferential surface 5123 is connected between the first end surface 5121 and the second end surface 5122, and the second outer circumferential surface 5123 is an annular surface. Referring to fig. 13, the second peripheral surface 5123 includes a plurality of second side surfaces connected end to end in sequence, that is, the second peripheral surface 5123 is formed by enclosing a plurality of second side surfaces. The plurality of second sides may be each formed in a plane, or the plurality of second sides may be each formed in an arc-shaped surface, or a portion of the plurality of second sides may be formed in a plane, and another portion of the plurality of second sides may be formed in an arc-shaped surface.

The cross-section of the first end portion 512 may be rectangular, square, circular, oval, trapezoidal, pentagonal, hexagonal or more, irregularly shaped, etc. Simple structure and convenient processing.

In some embodiments, the cross-sectional shape of the first end portion 512 is the same as the cross-sectional shape of the wire wrapping portion 511. Thus, the processing process of the magnetic core 51 can be simplified, and the processing difficulty of the magnetic core 51 can be reduced.

Referring to fig. 13-14, the second end 513 is connected to the other end of the winding portion 511 in the extending direction. That is, the first end portion 512 and the second end portion 513 are connected to both ends of the winding portion 511 in the extending direction. Referring to fig. 14, the second end 513 includes a third end face 5131, a fourth end face 5132, and a third outer peripheral face 5133. The third 5131 and fourth 5132 end faces away from each other. The second end 513 may be fixedly connected to the winding portion 511 by means of the third end face 5131.

The third outer circumferential surface 5133 is connected between the third end surface 5131 and the fourth end surface 5132, and the third outer circumferential surface 5133 is an annular surface. Referring to fig. 13, the third peripheral surface 5133 includes a plurality of third side surfaces connected end to end in sequence, that is, the third peripheral surface 5133 is formed by enclosing a plurality of third side surfaces. The plurality of third sides may be each formed in a plane, or the plurality of third sides may be each formed in an arc-shaped surface, or a part of the plurality of third sides may be formed in a plane, and another part of the plurality of third sides may be formed in an arc-shaped surface.

The second end 513 and the winding portion 511 may be integrally formed, or the second end 513 and the winding portion 511 may be fixedly connected by gluing, clamping, screw connection, or the like. The manner in which the second end portion 513 connects the winding portion 511 may be the same as or different from the manner in which the first end portion 512 connects the winding portion 511. The cross-sectional shape of the second end 513 may be the same as the shape of the first end 512. For example, in some embodiments, the second end 513 and the first end 512 may be symmetrically disposed at opposite ends of the winding portion 511.

Referring to fig. 13 and 14, at least a portion of the surface of the first outer circumferential surface 5113 is recessed inwardly with respect to the second outer circumferential surface 5123, that is, at least a portion of the surface of the first outer circumferential surface 5113 is recessed toward the central axis of the magnetic core 51 with respect to the second outer circumferential surface 5123. And at least a portion of the surface of the first outer circumferential surface 5113 is recessed inwardly relative to the third outer circumferential surface 5133. Specifically, the cross-sectional area of the winding portion 511 is smaller than the cross-sectional area of the first end portion 512, and the cross-sectional area of the winding portion 511 is smaller than the cross-sectional area of the second end portion 513. Thus, a groove may be defined between the first end portion 512, the winding portion 511, and the second end portion 513, and the coil body 52 may be wound in the groove. Therefore, on the one hand, the position of the coil body 52 can be limited by the first end portion 512 and the second end portion 513, so that the coil body 52 can be effectively prevented from slipping from the winding portion 511, on the other hand, the whole volume of the charging coil 5 can be reduced, on the other hand, the volume of the magnetic core 51 can be increased, the magnetic induction intensity of the charging coil 5 can be increased, and the charging performance of the charging coil 5 can be improved.

It is understood that in other embodiments, the first outer circumferential surface 5113 may not be recessed inwardly relative to the second outer circumferential surface 5123, and at least a portion of the surface of the first outer circumferential surface 5113 may be recessed inwardly relative to the third outer circumferential surface 5133. In still other embodiments, it is also possible that the first outer circumferential surface 5113 is not recessed inwardly relative to the second outer circumferential surface 5123 and the first outer circumferential surface 5113 is not recessed inwardly relative to the third outer circumferential surface 5133. In still other embodiments, it is also possible that the first outer circumferential surface 5113 is recessed inwardly relative to the second outer circumferential surface 5123, and that the first outer circumferential surface 5113 is not recessed inwardly relative to the third outer circumferential surface 5133.

The first heat conductive member 53 may serve to guide heat on the winding part 511 to the outside of the coil body 52. Specifically, referring to fig. 11 and 12, the first heat conductive member 53 includes a first heat conductive portion 531 and a second heat conductive portion 532. The first heat conductive portion 531 is thermally conductively connected to the winding portion 511, and the second heat conductive portion 532 is thermally conductively connected to the first heat conductive portion 531. Specifically, referring to fig. 10 in combination with fig. 12, the first heat conductive portion 531 is located between the coil body 52 and the winding portion 511. The coil body 52 is wound around the outside of the first heat conductive portion 531. The second heat conductive portion 532 is located outside the coil body 52.

In this embodiment, the second heat conductive part 532 is fixedly connected to the first heat conductive part 531. In this way, the heat conduction connection between the second heat conducting part 532 and the first heat conducting part 531 is convenient, and when in assembly, the first heat conducting part 531 and the second heat conducting part 532 can be integrally assembled on the magnetic core 51, so that the assembly steps between the first heat conducting piece 53 and the magnetic core 51 can be simplified, and the assembly difficulty of the first heat conducting piece 53 and the magnetic core 51 can be reduced.

In some embodiments, the first and second thermally conductive portions 531 and 532 are integrally formed structures. That is, the first heat conductive member 53 is an integrally formed member. In this way, the difficulty in processing the first heat conductive member 53 can be reduced, the heat conduction connection between the first heat conductive portion 531 and the second heat conductive portion 532 can be facilitated, and the connection strength between the first heat conductive portion 531 and the second heat conductive portion 532 can be improved.

Referring to fig. 12, the second heat conducting portion 532 includes a first portion 5321 and a second portion 5322. The first portion 5321 and the second portion 5322 are respectively in thermally conductive connection with the first thermally conductive portion 531. The first portion 5321, the first heat conductive portion 531, and the second portion 5322 may be arranged along the extending direction of the magnetic core 51. Specifically, the first portion 5321 is located on a side of the first surface 5111 of the winding portion 511 facing, and the second portion 5322 is located on a side of the second surface 5112 of the winding portion 511 facing. For example, the first portion 5321 and the second portion 5322 may be fixedly connected to opposite ends of the first heat conductive portion 531, respectively.

In this way, the heat on the first heat conducting portion 531 can be transferred to the first portion 5321 and the second portion 5322, so that the heat conduction path between the first heat conducting portion 531 and the second heat conducting portion 532 can be increased, the heat conduction efficiency between the first heat conducting portion 531 and the second heat conducting portion 532 can be improved, the heat on the winding portion 511 can be rapidly dissipated outwards through the first heat conducting member 53, and the heat dissipation performance of the charging coil 5 can be improved.

It is understood that in other embodiments, the second thermally conductive portion 532 may also include the first portion 5321 without the second portion 5322, or the second thermally conductive portion 532 may include the second portion 5322 without the first portion 5321.

In order to achieve the heat conduction connection between the first heat conduction portion 531 and the winding portion 511, please refer to fig. 15-16, fig. 15 is a schematic assembly view of the magnetic core 51 and the first heat conduction member 53 in the charging coil 5 shown in fig. 10, and fig. 16 is a cross-sectional view of the schematic assembly view shown in fig. 15 at the line D-D. The first heat conductive part 531 is fixedly connected to the winding part 511.

In some embodiments, the first heat conductive part 531 may be adhered to the winding part 511, and on the basis of this, in order to improve heat conduction efficiency between the winding part 511 and the first heat conductive part 531, the first heat conductive part 531 and the winding part 511 may be fixedly connected by a heat conductive adhesive.

In order to facilitate the fixed connection between the first heat conducting portion 531 and the winding portion 511, referring to fig. 15-16, the winding portion 511 includes a first fixing surface 5113a, and the first fixing surface 5113a faces the coil body 52. The first heat conductive part 531 is fixedly connected to the first fixing surface 5113a. Specifically, the first fixing surface 5113a is connected between the first surface 5111 and the second surface 5112. In this embodiment, the first fixing surface 5113a is located on the first outer peripheral surface 5113. That is, the first fixing surface 5113a constitutes at least part of the first outer peripheral surface 5113. Specifically, the first fixing surface 5113a is one of the first side surfaces of the first outer peripheral surface 5113. In this way, the first heat conductive portion 531 can be fixedly connected to the first outer circumferential surface 5113 of the winding portion 511, facilitating the assembly of the first heat conductive portion 531 and the winding portion 511.

In some embodiments, the shape of the first heat conductive part 531 may be adapted to the shape of the first fixing surface 5113a. Therefore, on one hand, the contact area between the winding part 511 and the first heat conduction part 531 can be increased, so that the heat on the winding part 511 can be conveniently transferred to the first heat conduction part 531, the heat conduction efficiency between the winding part 511 and the first heat conduction part 531 can be improved, and the outward dissipation of the heat on the winding part 511 is facilitated. Meanwhile, the assembly between the first heat conduction part 531 and the winding part 511 is facilitated, and the assembly difficulty between the first heat conduction part 531 and the winding part 511 can be reduced, so that the assembly difficulty between the first heat conduction piece 53 and the magnetic core 51 can be reduced.

Referring to fig. 15-16 in combination with fig. 11, the first heat conductive portion 531 is in a sheet shape. In this way, the heat dissipation area of the first heat conduction portion 531 can be increased, and the overlapping size between the first heat conduction portion 531 and the winding portion 511 can be reduced, which is advantageous in reducing the overall volume of the charging coil 5, and can achieve both the heat dissipation performance and the miniaturization design of the charging coil 5.

For example, in this embodiment, referring to fig. 15 and 16, the first fixing surface 5113a is formed in a plane, and the first heat conductive part 531 is formed in a flat sheet shape. It is understood that in other embodiments, when the first fixing surface 5113a may be formed as an arc surface, the first heat conductive portion 531 may have an arc-shaped sheet shape. In still other embodiments, the first fixing surface 5113a may further include both a planar surface and an arcuate surface, in which case the first thermally conductive portion 531 includes a planar sheet portion and an arcuate sheet portion.

In some embodiments, the thickness of the first thermally conductive portion 531 is greater than or equal to 20 μm (micrometers) and less than or equal to 50 μm. The thickness of the first heat conductive part 531 may be, for example, 20 μm, 22 μm, 25 μm, 28 μm, 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, 42 μm, 45 μm, 48 μm, 50 μm, etc. Further, the thickness of the first heat conductive part 531 is greater than or equal to 20 μm and less than or equal to 30 μm. In this way, the entire volume of the charging coil 5 can be reduced while securing the heat radiation capability of the first heat conductive portion 531, and the eddy current loss of the first heat conductive member 53 can be advantageously reduced, thereby facilitating the reduction of the heat generated by the charging coil 5 during operation.

In order to improve the heat conductive performance of the first heat conductive portion 531, the material of the first heat conductive portion 531 is graphite. That is, the first heat conductive part 531 may be a graphite sheet. Graphite has good layer heat conduction properties, in other words, graphite has good lateral heat conduction properties. For convenience in describing the heat conductive property of the graphite, referring to fig. 16, the thickness direction of the first heat conductive portion 531 is defined as the Z-axis direction. The good layer heat conduction performance of graphite means that the heat conduction coefficient of graphite in a plane perpendicular to the Z axis is large and can reach 1000W/(m.times.K) to 2000W/(m.times.K). At the same time, the thermal conductivity of graphite in the Z-axis direction is small, which can reach about 10W/(m.times.K). In this way, the heat on the first heat conducting portion 531 can diffuse outwards along the plane perpendicular to the Z axis, so that the heat on the winding portion 511 can be dissipated to the outside of the coil body 52 by means of the first heat conducting portion 531, and the heat dissipation performance of the charging coil 5 can be effectively improved.

Of course, the material of the first heat conductive part 531 is not limited thereto. In other embodiments, the material of the first heat conductive portion 531 may be metal, polymer material, or the like. As long as the heat conduction coefficient of the first heat conduction portion 531 is higher than that of the magnetic core 51. For example, the material of the first heat conductive part 531 may be gold, silver, copper, aluminum, copper alloy, aluminum alloy, or the like. The materials have high thermal conductivity and can satisfy the thermal conductivity of the first heat conductive portion 531, and the materials are non-magnetically conductive materials having a relative magnetic permeability of about 1, whereas the magnetic core 51 has high relative magnetic permeability, for example, when the material of the magnetic core 51 is ferrite, the magnetic core 51 has a relative magnetic permeability of 2000 to 3000, and the magnetic circuit of the charging coil 5 is not affected when the first heat conductive portion 531 is processed by the above materials. In addition, the conductivity of the metal and graphite is very high, the eddy current loss is small, and the heat generated by the charging coil 5 in the working process is reduced.

The material of the second heat conductive portion 532 includes, but is not limited to, graphite, metal, polymer material, and the like. The material of the second heat conductive portion 532 may be the same as or different from the material of the first heat conductive portion 531.

In some embodiments, referring to fig. 15-16, in order to improve the overall heat dissipation performance of the charging coil 5, the second heat conducting portion 532 is in a sheet shape. The thickness of the second heat conductive portion 532 may be the same as the thickness of the first heat conductive portion 531, or may be different from the thickness of the first heat conductive portion 531. In this way, the heat radiation area of the second heat conduction portion 532 can be increased, so that when the heat on the first heat conduction portion 531 is transferred to the second heat conduction portion 532, the heat can be rapidly radiated outward through the second heat conduction portion 532.

Referring to fig. 16, the thickness direction of the second heat conductive portion 532 is the same as the thickness direction of the first heat conductive portion 531. In this embodiment, the thickness direction of the first heat conductive portion 531 is parallel to the Z-axis direction. Specifically, the thickness direction of the first portion 5321 and the thickness direction of the second portion 5322 are the same as the thickness direction of the first heat conductive portion 531. In this case, the first heat conductive member 53 as a whole may be in the form of a sheet. In this way, the heat transfer between the first heat conductive part 531 and the second heat conductive part 532 is facilitated, the heat conduction efficiency is advantageously improved, and the structure of the first heat conductive member 53 is advantageously simplified, facilitating the processing of the first heat conductive member 53.

It is understood that, in other embodiments, at least part of the thickness direction of the second heat conductive portion 532 may be different from the thickness direction of the first heat conductive portion 531. For example, at least part of the second heat conductive parts 532 may have a thickness direction perpendicular to the thickness direction of the first heat conductive parts 531. For example, in some embodiments, a thickness direction of a portion of the second heat conductive portions 532 is the same as a thickness direction of the first heat conductive portions 531, and a thickness direction of another portion of the second heat conductive portions 532 is different from the thickness direction of the first heat conductive portions 531. As another example, in other embodiments, the thickness direction of all the second heat conductive portions 532 is different from the thickness direction of the first heat conductive portions 531.

In order to further improve the heat dissipation performance of the charging coil 5, as shown in fig. 15-16, the first portion 5321 of the second heat conducting portion 532 is connected to the first end 512 in a heat conducting manner, and the second portion 5322 of the second heat conducting portion 532 is connected to the second end 513 in a heat conducting manner. In this way, the heat conduction area between the first heat conducting element 53 and the magnetic core 51 can be increased, on one hand, the heat conduction path of the magnetic core 51 can be expanded, so that the heat on the winding part 511 can be transferred to the first heat conducting part 531, transferred to the first part 5321 and the second part 5322 through the first heat conducting part 531, and then emitted outwards through the first part 5321 and the second part 5322, and meanwhile, the heat on the first end 512 can be transferred to the first part 5321, emitted outwards through the first part 5321, and the heat on the second end 513 can be transferred to the second part 5322, emitted outwards through the second part 5322, the heat conduction efficiency between the first heat conducting element 53 and the magnetic core 51 can be increased, and further the heat dissipation performance of the charging coil 5 can be improved, so that the whole temperature of the magnetic core 51 is more uniform, and the situation that middle heat and two heads are cool in the magnetic core 51 can be avoided.

In some embodiments, the first portion 5321 and the second portion 5322 are symmetrically disposed on both sides of the first thermally conductive portion 531. In this way, the heat conduction efficiency between the first heat conduction portion 531 and the first portion 5321 and the heat conduction efficiency between the second heat conduction portion 532 and the second portion 5322 can be substantially the same, and the uniformity of the temperature of the entire magnetic core 51 can be further improved.

In other embodiments, the first portion 5321 of the second thermally conductive portion 532 may be thermally conductively coupled to the first end 512, while the second portion 5322 of the second thermally conductive portion 532 is not thermally conductively coupled to the second end 513. Alternatively, the second portion 5322 of the second thermally conductive portion 532 may be thermally conductively coupled to the second end 513, while the first portion 5321 of the second thermally conductive portion 532 is not thermally conductively coupled to the first end 512.

In some embodiments, the first portion 5321 of the second thermally conductive portion 532 is fixedly connected to the first end 512 and the second portion 5322 of the second thermally conductive portion 532 is fixedly connected to the second end 513. For example, the first portion 5321 and the first end portion 512 may be fixedly connected by an adhesive structure such as a heat conductive adhesive, a hot melt adhesive, a double sided adhesive, etc., and the second portion 5322 and the second end portion 513 may be fixedly connected by an adhesive structure such as a heat conductive adhesive, a hot melt adhesive, a double sided adhesive, etc. In this way, the first heat conductive member 53 can be fixed to the magnetic core 51 by the first heat conductive portion 531, and can be fixed to the magnetic core 51 by the first portion 5321 of the second heat conductive portion 532 and the second portion 5322 of the second heat conductive portion 532, so that the connection area between the first heat conductive member 53 and the magnetic core 51 can be increased, the connection strength between the first heat conductive member 53 and the magnetic core 51 can be increased, and the first heat conductive member 53 can be prevented from falling off the magnetic core 51, and the heat conduction efficiency between the first heat conductive member 53 and the magnetic core 51 can be increased, and the stability and reliability of the overall structure of the charging coil 5 can be improved.

It will be appreciated that in other embodiments, the first portion 5321 of the second heat conducting portion 532 may be fixedly connected to the first end portion 512, and the second portion 5322 of the second heat conducting portion 532 may not be fixedly connected to the magnetic core 51. Alternatively, the second portion 5322 of the second heat conducting portion 532 may be fixedly connected to the second end 513, and the first portion 5321 of the second heat conducting portion 532 may not be fixedly connected to the magnetic core 51.

In some embodiments, referring to fig. 14-16, the first end 512 includes a second fixing surface 5123a, and the second fixing surface 5123a faces the same direction as the first fixing surface 5113 a. The first portion 5321 of the second heat conductive portion 532 is fixedly connected to the second fixing surface 5123a. In this way, the fixed connection between the first portion 5321 and the first end portion 512 is facilitated, and the difficulty in assembling the first heat conducting member 53 and the magnetic core 51 can be reduced.

In this embodiment, the second fixing surface 5123a is located on the second outer peripheral surface 5123. That is, the second fixing surface 5123a constitutes at least part of the second outer peripheral surface 5123. Illustratively, the second fixing surface 5123a is one of the second lateral surfaces 5123. In this way, the first portion 5321 may be fixedly attached to the second outer peripheral surface of the first end portion 512, facilitating assembly of the first portion 5321 with the first end portion 512.

The second fixing surface 5123a may be formed in a plane or in an arc shape. The shape of the first portion 5321 is adapted to the shape of the second fixing surface 5123 a.

On this basis, in order to be able to reduce the superimposed size between the first portion 5321 and the magnetic core 51 while increasing the heat radiation area of the first portion 5321, the thickness of the first portion 532 may be greater than or equal to 20 μm (micrometers) and less than or equal to 50 μm. By way of example, the thickness of the first portion 532 may be 20 μm, 22 μm, 25 μm, 28 μm, 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, 42 μm, 45 μm, 48 μm, 50 μm, etc. The thickness of the first portion 532 may be the same as or different from the thickness of the first heat conductive portion 531.

To facilitate a secure connection between the second portion 5322 and the second end 513, the second end 513 includes a third securing surface 5133a. The third fixing surface 5133a faces the same direction as the first fixing surface 5113 a. The second portion 5322 of the second heat conducting portion 532 is fixedly connected to the third fixing surface 5133a. In this way, the fixed connection between the second portion 5322 and the second end portion 513 is facilitated, and the difficulty in assembling the first heat conductive member 53 and the magnetic core 51 can be reduced.

Wherein, the third fixing surface 5133a may be connected between the third end surface 5131 and the fourth end surface 5132. In this embodiment, the third fixing surface 5133a is located on the third outer peripheral surface 5133. That is, the third fixing surface 5133a constitutes at least part of the third outer peripheral surface 5133. The third fixing surface 5133a is one of the third lateral surfaces 5133. In this way, the second portion 5322 of the second heat conducting portion 532 is easily assembled with the second end portion 513.

The third fixing surface 5133a may be formed in a plane or in an arc shape. The shape of the second portion 5322 is adapted to the shape of the third fixing surface 5133 a.

On this basis, in order to be able to reduce the superimposed size between the second heat conduction portion 532 and the magnetic core 51 while increasing the heat radiation area of the second heat conduction portion 532, the thickness of the second heat conduction portion 532 may be greater than or equal to 20 μm (micrometers) and less than or equal to 50 μm. Specifically, the thickness of the first portion 5321 is greater than or equal to 20 μm (micrometers) and less than or equal to 50 μm, and the thickness of the second portion 5322 is greater than or equal to 20 μm (micrometers) and less than or equal to 50 μm.

The second heat conductive portion 532 may have a thickness of 20 μm, 22 μm, 25 μm, 28 μm, 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, 42 μm, 45 μm, 48 μm, 50 μm, etc. as an example. The thickness of the second heat conductive portion 532 may be the same as or different from the thickness of the first heat conductive portion 531.

In this embodiment, referring to fig. 14-16, the first fixing surface 5113a, the second fixing surface 5123a, and the third fixing surface 5133a are disposed coplanar. For example, the first, second, and third fixing surfaces 5113a, 5123a, 5133a may each be formed as a plane, in which case the first, second, and third fixing surfaces 5113a, 5123a, 5133a are located in the same plane. Or the first fixing surface 5113a, the second fixing surface 5123a, and the third fixing surface 5133a may be formed as arc surfaces, in which case the first fixing surface 5113a, the second fixing surface 5123a, and the third fixing surface 5133a are located in the same arc surface.

In this way, the assembly between the first heat conducting member 53 and the magnetic core 51 is facilitated, and the first heat conducting portion 531 and the second heat conducting portion 532 may be configured to be coplanar, so that the first heat conducting member 53 is entirely sheet-shaped, the structure of the first heat conducting member 53 can be simplified, and the processing cost of the first heat conducting member 53 can be reduced.

Illustratively, the second fixing surface 5123a, the first fixing surface 5113a, and the third fixing surface 5133a are sequentially connected and disposed in a coplanar manner. Specifically, the first fixing surface 5113a is connected to and coplanar with the second fixing surface 5123a, and the first fixing surface 5113a is connected to and coplanar with the third fixing surface 5133 a.

It will be appreciated that in other embodiments, the first fixing surface 5113a may be disposed coplanar with the second fixing surface 5123a, the first fixing surface 5113a may not be coplanar with the third fixing surface 5133a, or the first fixing surface 5113a may be disposed coplanar with the third fixing surface 5133a, and the first fixing surface 5113a may not be coplanar with the second fixing surface 5123 a.

On the basis of any of the above embodiments, the coil body 52 is thermally conductively connected to the first heat conductive portion 531 of the first heat conductive member 53. For example, the coil body 52 and the first heat conductive part 531 may be directly connected, or the coil body 52 and the first heat conductive part 531 may be indirectly connected through other heat conductive structures (e.g., heat conductive glue, etc.). In this way, the heat on the coil body 52 can be transferred to the first heat conductive part 531, and then transferred from the first heat conductive part 531 to the second heat conductive part 532, and dissipated outward through the second heat conductive part 532. Therefore, the heat dissipation speed on the coil body 52 can be increased, the temperature of the coil body 52 can be reduced, the heat transfer between the coil body 52 and the winding part 511 can be reduced, the degree of heating of the winding part 511 by the coil body 52 is reduced, the temperature of the magnetic core 51 can be more uniform, the situation that two ends of the magnetic core 51 are hot and cool in the middle of the magnetic core is avoided, and the heat dissipation performance of the charging coil 5 can be improved.

Referring to fig. 15 in combination with fig. 16, in this embodiment, the surfaces of the first outer peripheral surface 5113 except for the first fixing surface 5113a are recessed inward with respect to the second outer peripheral surface 5123, and the surfaces of the first outer peripheral surface 5113 except for the first fixing surface 5113a are recessed inward with respect to the third outer peripheral surface 5133. In this way, a groove can be defined between the first end portion 512, the winding portion 511, and the second end portion 513, which can reduce the overall volume of the charging coil 5.

In some embodiments, the first thermally conductive member 53 is non-annular. In this way, the eddy current loss of the first heat conductive member 53 can be further reduced, thereby contributing to reduction of heat generated during operation of the charging coil 5.

Table 1 lists simulation results of inductance, equivalent alternating current resistance (may also be referred to as equivalent ACR) of the charging coil 5 including the first heat conductive member 53 and the charging coil 5 not including the first heat conductive member 53.

TABLE 1

As can be seen from table 1, when the charging coil 5 does not include the first heat conductive member 53, the inductance of the charging coil 5 is 52.613uH and the equivalent ac resistance is 1335.5mΩ.

After the first heat conducting member 53 is added to the charging coil 5, when the first heat conducting member 53 is a graphite sheet, the inductance of the charging coil 5 is 52.611uH and the equivalent ac resistance is 1338.5mΩ. Compared with the charging coil 5 without the first heat conducting member 53, the charging coil 5 in the scheme has a change value of inductance of 0.002uH and a change rate of inductance of 0.0038%; the change value of the equivalent alternating current resistance is 3mΩ, and the change rate of the equivalent alternating current resistance is 0.22%.

When the first heat conductive member 53 is a copper sheet, the inductance of the charging coil 5 is 52.558uH and the equivalent ac resistance is 1380.0mΩ. Compared with the charging coil 5 without the first heat conducting piece 53, the charging coil 5 in the scheme has the change value of the inductance of 0.055uH and the change rate of the inductance of 0.1%; the change value of the equivalent alternating current resistance was 44.5mΩ, and the change rate of the equivalent alternating current resistance was 3.3%.

From this, it can be seen that after the first heat conducting member 53 is disposed in the charging coil 5, the change of inductance and equivalent ac resistance is smaller than that of the charging coil 5 without the first heat conducting member 53, so that the charging coil 5 in the embodiment of the present application has engineering feasibility without affecting the performance of the charging coil 5 due to the disposition of the first heat conducting member 53 in the charging coil 5.

Referring to fig. 17-19, fig. 17 is an exploded view of the charging coil 5 shown in fig. 10 and the heat sink 6 and the circuit board 21 in the electronic stylus 100, fig. 18 is another exploded view of the charging coil 5 shown in fig. 10 and the heat sink 6 and the circuit board 21 in the electronic stylus 100, and fig. 19 is an assembled schematic view of the charging coil 5 shown in fig. 10 and the heat sink 6 and the circuit board 21 in the electronic stylus 100.

The structure and material of the heat sink 6 may be the same as those of the heat sink 6 in the embodiment shown in fig. 7, and the assembly between the heat sink 6 and the circuit board 21 may be the same as that between the heat sink 6 and the circuit board 21 in the embodiment shown in fig. 7, which will not be described in detail herein.

Specifically, the second heat conductive portion 532 of the first heat conductive member 53 is thermally conductively connected to the heat sink 6. In some embodiments, the second heat conducting portion 532 is fixedly connected to the heat sink 6. For example, the second heat conductive portion 532 and the heat sink 6 may be adhesively connected by the adhesive structure 7. The adhesive structure 7 includes, but is not limited to, a heat conductive adhesive, a hot melt adhesive, a double sided adhesive, and the like. Thus, referring to fig. 19, the heat on the first heat conducting member 53 can be transferred to the heat sink 6 via the second heat conducting portion 532 and transferred to the circuit board 21 via the heat sink 6, so that the circuit board 21 is dissipated outwards, the heat dissipation area of the charging coil 5 can be increased, and the heat dissipation performance of the charging coil 5 can be improved.

Further, the coil body 52 is thermally conductively connected to the heat sink 6. In some embodiments, the coil body 52 and the heat sink 6 may be adhesively connected by an adhesive structure 7. The adhesive structure 7 includes, but is not limited to, a heat conductive adhesive, a hot melt adhesive, a double sided adhesive, and the like. Thus, the heat on the coil body 52 can be transferred to the heat sink 6 via the second heat conducting portion 532 and transferred to the circuit board 21 via the heat sink 6, so that the heat dissipation area of the charging coil 5 can be increased and the heat dissipation performance of the charging coil 5 can be improved.

It will be appreciated that in other embodiments, the heat sink 6 may be fixedly attached to other components of the housing 1 of the electronic device. In this way, after the heat of the first heat conducting member 53 and the coil body 52 is transferred to the heat sink 6, the heat can be dissipated to the outside through other components such as the housing 1 of the electronic device, and the heat dissipation performance of the charging coil 5 can be improved.

In still other embodiments, referring to fig. 20-21, fig. 20 is a cross-sectional view of a charging coil 5 according to still other embodiments of the present application, and fig. 21 is an exploded view of the charging coil 5 shown in fig. 20. The charging coil 5 in the present embodiment is different from the charging coil 5 in the embodiment shown in fig. 10 in that the structure of the first heat conductive member 53 in the present embodiment is different from the structure of the first heat conductive member 53 in the embodiment shown in fig. 10, and the structure of the magnetic core 51 in the present embodiment is different from the structure of the magnetic core 51 in the embodiment shown in fig. 10.

Specifically, referring to fig. 20-21, the first fixing surface 5113a of the winding portion 511 is recessed relative to the second fixing surface 5123a of the first end 512, that is, the first fixing surface 5113a is recessed relative to the second fixing surface 5123a toward the central axis of the magnetic core 51 (e.g., O1 line in fig. 21). The first fixing surface 5113a of the winding portion 511 is recessed inward relative to the third fixing surface 5133a of the second end 513. The first heat conductive member 53 includes a first connection portion 533 and a second connection portion 534 in addition to the first heat conductive portion 531 and the second heat conductive portion 532.

Referring to fig. 22, fig. 22 is an enlarged view of the area a of the exploded view shown in fig. 21. The first connection portion 533 is connected between the first heat conduction portion 531 and the first portion 5321 of the second heat conduction portion 532, the first heat conduction portion 531 being located on a side of the first portion 5321 near the central axis of the magnetic core 51. Referring to fig. 23, fig. 23 is an enlarged view of a B region of the exploded view shown in fig. 21. The second connection portion 534 is connected between the first heat conductive portion 531 and the second portion 5322 of the second heat conductive portion 532. The first heat conductive portion 531 is located on a side of the second portion 5322 near the center axis of the core 51. The central axis of the magnetic core 51 is an axis that passes through the geometric center of the magnetic core 51 and is parallel to the longitudinal direction of the magnetic core 51.

Referring to fig. 20, the first heat conducting portion 531 is fixedly connected to the first fixing surface 5113a, the first portion 5321 of the second heat conducting portion 532 is fixedly connected to the second fixing surface 5123a, and the second portion 5322 of the second heat conducting portion 532 is fixedly connected to the third fixing surface 5133a. In this way, the fixing between the first heat conducting member 53 and the magnetic core 51 is also facilitated, and a groove can be defined between the first fixing surface 5113a, the second fixing surface 5123a and the third fixing surface 5133a, which is advantageous in reducing the overall volume of the charging coil 5.

In some embodiments, referring to fig. 20, the first connecting portion 533 is fixedly connected to the second end surface 5122 of the first end portion 512. Illustratively, the first connection portion 533 may be fixedly connected to the second end surface 5122 by the adhesive structure 7. In this way, on the one hand, the heat conduction area between the first heat conductive member 53 and the magnetic core 51 can be increased, which is advantageous in improving the heat conduction efficiency between the magnetic core 51 and the first heat conductive member 53, and thus the heat radiation performance of the charging coil 5 can be improved. On the other hand, the connection area between the first heat conductive member 53 and the magnetic core 51 can be increased, and the connection reliability between the first heat conductive member 53 and the magnetic core 51 can be improved.

It is understood that in other embodiments, the first connection portion 533 may contact only the second end surface 5122, for example, the second connection portion 534 may be attached to the second end surface 5122. Or the first connection portion 533 may be provided spaced apart from the second end surface 5122.

Further, with continued reference to fig. 20, the second connecting portion 534 is fixedly connected to the third end 5131 of the second end 513. The second connection portion 534 may be fixedly connected to the third end face 5131 by gluing, for example. In this way, the heat conduction area and the connection area between the first heat conductive member 53 and the magnetic core 51 can be further increased, so that the heat radiation performance of the charging coil 5 and the connection reliability between the first heat conductive member 53 and the magnetic core 51 can be improved.

It is understood that in other embodiments, the first heat conductive member 53 may not include the second connection portion 534, in which case the first fixing surface 5113a and the third fixing surface 5133a may be coplanar. Alternatively, the first heat conductive member 53 may not include the first connection portion 533, in which case the first fixing surface 5113a and the second fixing surface 5123a may be coplanar.

In this embodiment, the entire first outer circumferential surface 5113 may be recessed inward with respect to the second outer circumferential surface 5123, and the entire first outer circumferential surface 5113 may be recessed inward with respect to the third outer circumferential surface 5133. In this way, a groove may be defined between the first end portion 512, the winding portion 511, and the second end portion 513, enabling the entire volume of the charging coil 5 to be reduced.

In still other embodiments, referring to fig. 24-25, fig. 24 is a cross-sectional view of a charging coil 5 according to still other embodiments of the present application, and fig. 25 is a perspective view of a magnetic core 51 in the charging coil 5 shown in fig. 24.

The charging coil 5 in the present embodiment is different from the charging coil 5 shown in fig. 10 in that the structure of the magnetic core 51 in the present embodiment is different from the structure of the magnetic core 51 in the embodiment shown in fig. 10.

Specifically, referring to fig. 24-25, a first recess 5124 is formed in the second outer circumferential surface 5123 of the first end 512. The first recess groove 5124 may be concavely formed by the second outer circumferential surface 5123 toward the central axis of the core 51.

Referring to fig. 26, fig. 26 is a sectional view of the charging coil 5 shown in fig. 25 at line E-E. The first recessed groove 5124 includes a first notch 5124a, a second notch 5124b, and a first groove bottom wall 5124c, the first notch 5124a extending through the second outer peripheral surface 5123, the first groove bottom wall 5124c opposing the first notch 5124a, and the second notch 5124b extending through the second end face 5122 of the first end 512. The second fixing surface 5123a is formed on the first groove bottom wall 5124 c.

In this way, the first portion 5321 of the second heat conducting portion 532 may be fixedly connected to the first tank bottom wall 5124c, and the volume of the first end portion 512 may be increased while the stacking size between the first portion 5321 and the first end portion 512 may be reduced, so that the overall volume of the charging coil 5 may be reduced while the magnetic field strength of the charging coil 5 is provided.

In this embodiment, the first groove bottom wall 5124c is coplanar with the first fixation surface 5113a, it is understood that in other embodiments, the first groove bottom wall 5124c may not be coplanar with the first fixation surface 5113 a.

Further, referring to fig. 24 to 25, a second recess 5134 is formed in the third outer circumferential surface 5133 of the second end 513. Specifically, referring to fig. 26, the second concave groove 5134 includes a third notch 5134a, a fourth notch 5134b and a second groove bottom wall 5134c, the third notch 5134a penetrates the third peripheral surface 5133, the second groove bottom wall 5134c is opposite to the third notch 5134a, and the fourth notch 5134b penetrates the third end surface 5131 of the second end 513.

In this way, the second portion 5322 of the second heat conducting portion 532 can be fixedly connected to the second tank bottom wall 5134c, and the volume of the second end portion 513 can be increased while the overlapping dimension between the first heat conducting member 53 and the second end portion 513 can be reduced, so that the entire volume of the charging coil 5 can be reduced while the magnetic field strength of the charging coil 5 is provided.

It is understood that in other embodiments, when the first concave groove 5124 is provided on the second fixing surface 5123a, the second concave groove 5134 may not be provided on the third fixing surface 5133 a. Similarly, when the second concave groove 5134 is provided on the third fixing surface 5133a, the first concave groove 5124 may not be provided on the second fixing surface 5123 a.

In still other embodiments, referring to fig. 27, fig. 27 is a cross-sectional view of a charging coil 5 according to still other embodiments of the present application. The charging coil 5 in the present embodiment is different from the charging coil 5 in any of the above embodiments in that the charging coil 5 in the present embodiment includes a plurality of first heat conductive members 53. The plurality of first heat conductive members 53 are arranged in the circumferential direction of the magnetic core 51. Wherein, the term "plurality" as used herein refers to two or more. The structures of the plurality of first heat conductive members 53 may be identical, or the structures of the plurality of first heat conductive members 53 may be different, or the structures of some of the plurality of first heat conductive members 53 may be identical, and the structures of other ones of the plurality of first heat conductive members 53 may be different. Thus, the heat dissipation area of the charging coil 5 can be increased, and the heat dissipation performance of the charging coil 5 can be improved.

For example, in the embodiment shown in fig. 27, the charging coil 5 includes two first heat conductive members 53, and the first outer peripheral surface 5113 of the winding portion 511 includes a fourth fixing surface 5113b, and the fourth fixing surface 5113b is disposed opposite to the first fixing surface 5113 a. The two first heat conducting portions 531 of the two first heat conducting members 53 are fixedly connected to the first fixing surface 5113a and the fourth fixing surface 5113b, respectively. The structure of the fourth fixing surface 5113b can be designed with reference to the structure of the first fixing surface 5113a, which will not be described in detail herein.

As another example, referring to fig. 28, fig. 28 is a schematic structural diagram of a magnetic core 51 and a first heat conducting member 53 in a charging coil 5 according to still another embodiment of the present application, in this embodiment, a winding portion 511 includes a first fixing surface 5113a and a fifth fixing surface 5113c, the fifth fixing surface 5113c is disposed adjacent to the first fixing surface 5113a, and two first heat conducting portions 531 of two first heat conducting members 53 may be respectively and fixedly connected to the first fixing surface 5113a and the fifth fixing surface 5113c. The structure of the fifth fixing surface 5113c can be designed with reference to the structure of the first fixing surface 5113a, which will not be described in detail herein.

In this embodiment, the two first heat conductive parts 531 are disposed at a distance, and it is understood that in other embodiments, two adjacent first heat conductive parts 531 may be integrally connected. For example, two adjacent first heat conductive members 53 may be integrally formed. In this way, the assembling steps between the first heat conductive member 53 and the magnetic core 51 are simplified, the assembling difficulty can be reduced, and the assembling efficiency can be improved.

In addition, in other embodiments, the number of the first heat conductive members 53 may be three, four or more, which are not listed here.

In still other embodiments, referring to fig. 29, fig. 29 is a cross-sectional view of a charging coil 5 according to still other embodiments of the present application. In this embodiment, the magnetic core 51 does not include the first end 511, the first portion 5321 of the second heat conducting portion 532 is fixedly connected to one end of the first heat conducting portion 531, and the first portion 5321 may be fixedly connected to the first surface 5111 of the winding portion 511. In this way, the heat of the winding portion 511 can be also conducted out of the coil body 52 by the first heat conductive member 53, and the heat radiation performance of the charging coil 5 can be improved.

Further, with continued reference to fig. 29, the magnetic core 51 does not include the second end 512, and the second portion 5322 of the second heat conducting portion 532 is fixedly connected to the other end of the first heat conducting portion 531. The first portion 5321 and the second portion 5322 are disposed opposite. The second portion 5322 may be fixedly connected to the second surface 5112 of the winding portion 511. In this way, the heat of the winding portion 511 can be also conducted out of the coil body 52 by the first heat conductive member 53, and the heat radiation performance of the charging coil 5 can be improved.

In still other embodiments, the core 51 may include the second end 513 without the first end 512. In this case, the second heat conductive portion 532 may include a first portion 5321 and a second portion 5322, and the first portion 5321 may be fixedly connected to the first surface 5111, and the second portion 5322 may be fixedly connected to the third fixing surface 5133a of the second end 513. Alternatively, the second heat conductive portion 532 may not include the first portion 5321 or the second portion 5322.

In still other embodiments, it is also possible that the core 51 includes the first end 512 and does not include the second end 513. In this case, the second heat conductive portion 532 may include a first portion 5321 and a second portion 5322, and the first portion 5321 may be fixedly connected to the second fixing surface 5123a of the first end 512, and the second portion 5322 may be fixedly connected to the second surface 5112 of the winding portion 511. Alternatively, the second heat conductive portion 532 may not include the first portion 5321 or the second portion 5322.

Referring to fig. 30, fig. 30 is a schematic diagram illustrating an assembly of the charging coil 5, the heat sink 6 of the electronic stylus 100 and the circuit board 21 shown in fig. 29. In order to achieve the heat conduction connection between the second heat conducting portion 532 and the heat sink 6, the heat sink 6 includes a body portion 601, a first flange portion 602 and a second flange portion 603, the first flange portion 602 and the second flange portion 603 are fixedly connected to two ends of the body portion 601, respectively, and the first flange portion 602 and the second flange portion 603 are disposed opposite to each other.

The body 601 is fixedly connected to the circuit board 21, and the coil body 52 is fixedly connected to a surface of the body 601 facing away from the circuit board 21. The first flange portion 602 is located on a side facing the first surface 5111, and the first flange portion 602 is thermally connected to the first portion 5321 of the second heat conducting portion 532. Illustratively, the first cuff 602 and the first portion 5321 may be adhesively connected by an adhesive structure. The second flange portion 603 is located on a side facing the second surface 5112, and the second flange portion 603 is thermally connected to the second portion 5322 of the second heat conducting portion 532. Illustratively, the second cuff 603 and the second portion 5322 may be adhesively connected by an adhesive structure.

In this way, the heat on the first portion 5321 of the second heat conducting portion 532 can be transferred to the body portion 601 through the first flange portion 602 of the heat sink 6 and then transferred to the circuit board 21 through the body portion 601, and the heat on the second portion 5322 of the second heat conducting portion 532 can be transferred to the body portion 601 through the second flange portion 603 of the heat sink 6 and then transferred to the circuit board 21 through the body portion 601, so that the heat dissipation rate of the charging coil 5 can be further increased and the heat dissipation performance of the charging coil 5 can be improved.

It will be appreciated that when the core 51 includes the first end portion 512, the heat sink 6 may include the first burring 602, and in this case, the first burring 602 may be thermally conductively connected to the first end face 5121 of the first end portion 512, or the heat sink 6 may not include the first burring 602. Similarly, when the core 51 includes the second end 513, the heat sink 6 may include the second flange portion 603, and in this case, the second flange portion 603 may be thermally connected to the fourth end face 5132 of the second end 513, or the heat sink 6 may not include the second flange portion 603.

In still other embodiments, referring to fig. 31, fig. 31 is a cross-sectional view of a charging coil 5 according to still other embodiments of the present application. The charging coil 5 in the present embodiment is different from the charging coil 5 shown in fig. 10 in that the charging coil 5 in the present embodiment includes a second heat conductive member 54 in addition to the first heat conductive member 53, the second heat conductive member 54 being thermally conductively connected to the first end face 5121 of the first end portion 512. Thus, the heat on the first end portion 512 can be dissipated outwards through the second heat conducting member 54, so that the heat dissipation rate of the charging coil 5 can be further increased, and the heat dissipation performance of the charging coil 5 can be improved.

It is understood that the second heat conductive member 54 in this embodiment may be combined with any of the embodiments of the present application.

Specifically, the second heat conductive member 54 may be fixedly coupled to the first end surface 5121. Illustratively, the second thermally conductive member 54 and the first end face 5121 may be adhesively coupled by an adhesive structure.

Specifically, the shape of the second heat conductive member 54 is adapted to the shape of the first end face 5121. The second heat conductive member 54 may have a sheet shape. The material and thickness of the second heat conductive member 54 may be designed with reference to the material and thickness of the first heat conductive portion 531, which will not be described in detail herein.

In some embodiments, the second thermally conductive member 54 is integrally connected with the first thermally conductive member 53. For example, the second heat conductive member 54 and the first heat conductive member 53 may be integrally formed, or the second heat conductive member 54 and the first heat conductive member 53 may be integrally connected by welding, bonding, or the like. Specifically, the second heat conductive member 54 may be connected to the first portion 5321 of the second heat conductive portion 532. In this way, the first heat conductive member 53 and the second heat conductive member 54 can be integrally assembled to the magnetic core 51, which can simplify the assembly process of the charging coil 5 and is advantageous in improving the assembly efficiency of the charging coil 5.

It will be appreciated that in other embodiments, the second thermally conductive member 54 may be spaced apart from the first thermally conductive member 53.

Further, referring to fig. 31, the charging coil 5 in the present embodiment further includes a third heat conducting member 55, and the third heat conducting member 55 is thermally connected to the fourth end face 5132 of the second end 513. The third heat conductive member 55 according to the embodiment of the present application may be combined with any of the embodiments of the present application.

The structure and material of the third heat conductive member 55 may be designed with reference to the second heat conductive member 54. In addition, the connection between the third heat conductive member 55 and the first heat conductive member 53 may be designed with reference to the connection between the second heat conductive member 54 and the first heat conductive member 53, and the connection between the third heat conductive member 55 and the fourth end face 5132 may be designed with reference to the connection between the second heat conductive member 54 and the first end face 5121, which will not be described in detail herein.

It will be appreciated that in other embodiments, the charging coil 5 may also include the second heat conductive member 54 instead of the third heat conductive member 55, or the charging coil 5 may also include the third heat conductive member 55 instead of the second heat conductive member 54.

Referring to fig. 32, fig. 32 is an assembly schematic diagram of the charging coil 5 shown in fig. 31, the heat sink 6 of the electronic stylus 100, and the circuit board 21. The heat sink 6 in this embodiment is the same as the heat sink 6 in the embodiment shown in fig. 30 and will not be described in detail here. In this embodiment, the first burring 602 of the heat sink 6 is thermally conductively connected to the second heat conductive member 54, and the second burring 603 of the heat sink 6 is thermally conductively connected to the third heat conductive member 55.

In this way, the heat on the charging coil 5 can be transferred to the heat sink 6 through the first heat conductive member 53, the first flange portion 602 of the heat sink 6 through the second heat conductive member 54, the second flange portion 603 of the heat sink 6 through the third heat conductive member 55, the body portion 601 through the first flange portion 602 and the second flange portion 603, and the circuit board 21 through the body portion 601, so that the heat dissipation rate of the heat on the charging coil 5 can be further improved, and the heat dissipation performance of the charging coil 5 can be further improved.

It will be appreciated that in other embodiments, the heat sink 6 may also include the body portion 601, the first flange portion 602, and not the second flange portion 603, or the heat sink 6 may also include the body portion 601, the second flange portion 603, and not the first flange portion 602, or the heat sink 6 may also include only the body portion 601, and not the first flange portion 602 and the second flange portion 603.

The embodiment of the application also provides a processing method of the charging coil 5. The processing method may be used to process the charging coil 5 in any of the above embodiments. Referring to fig. 33, fig. 33 is a flowchart of a processing method of the charging coil 5 according to some embodiments of the present application. The processing method of the charging coil 5 comprises the following steps:

step S100: providing a magnetic core 51, the magnetic core 51 including a winding portion 511;

the magnetic core 51 may be any magnetic core 51 in the embodiments of the present application, and will not be described in detail herein.

Step S200: providing a first heat conducting member 53, wherein the first heat conducting member 53 comprises a first heat conducting part 531 and a second heat conducting part 532 which are connected in a heat conducting manner, and the first heat conducting part 531 is fixedly connected to the winding part 511;

the first heat conducting member 53 may be any one of the first heat conducting members 53 according to the embodiments of the present application, and will not be described in detail herein.

Step S300: the coil body 52 is wound on the winding portion 511 such that the first heat conductive portion 531 is located between the coil body 52 and the winding portion 511 and the second heat conductive portion 532 is located outside the coil body 52.

Specifically, in the charging coil 5 according to the embodiment of the present application, during the processing, the first heat conducting member 53 is fixedly connected to the magnetic core 51, and then the coil body 52 is wound, so that the coil body 52 is wound around the first heat conducting portion 531, and the first heat conducting portion 531 is located between the coil body 52 and the winding portion 511, and the second heat conducting portion 532 is located outside the coil body 52. The process is simple and convenient to process.

In other embodiments, when the charging coil 5 includes the second heat conductive member 54 and/or the third heat conductive member 55, the second heat conductive member 54 and/or the third heat conductive member 55 may be mounted on the magnetic core 51 before step S300, or may be mounted on the magnetic core 51 after step S300.

In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A charging coil, comprising:

a magnetic core including a winding portion;

the coil body is wound on the winding part;

the first heat conduction piece comprises a first heat conduction part and a second heat conduction part, wherein the first heat conduction part is in heat conduction connection with the second heat conduction part, the first heat conduction part is in heat conduction connection with the winding part, at least one part of the first heat conduction part is located between the coil body and the winding part, and the second heat conduction part is located outside the coil body.

2. The charging coil as set forth in claim 1, wherein the winding portion includes a first surface, a second surface, and a first outer peripheral surface, the first surface and the second surface being located at both ends of an extending direction of the winding portion, respectively, the first outer peripheral surface being connected between the first surface and the second surface, the coil body being wound outside the first outer peripheral surface;

the second heat conduction part comprises a first part, the first part is in heat conduction connection with the first heat conduction part, and the first part is positioned on the side, facing the first surface, of the first part.

3. The charging coil of claim 2, wherein the first portion is fixedly connected to the first thermally conductive portion.

4. A charging coil according to claim 2 or 3, wherein the magnetic core comprises a first end portion connected to a first surface of the winding portion, the first portion being fixedly connected to the first end portion.

5. The charging coil as set forth in claim 4, wherein the winding portion includes a first fixing surface facing the coil body;

the first end part comprises a second fixing surface, and the second fixing surface is oriented in the same direction as the first fixing surface;

the first heat conduction part is fixedly connected to the first fixing surface, and the first part is fixedly connected to the second fixing surface.

6. The charging coil of claim 5, wherein the first fixing surface is located on the first outer peripheral surface.

7. The charging coil as set forth in claim 5 or 6, wherein the first end portion includes a first end face, a second end face, and a second outer peripheral face, the first end face being opposite to the second end face, the second end face being connected to the first surface, the second outer peripheral face being connected between the first end face and the second end face, the second fixing face being located on the second outer peripheral face.

8. The charging coil as set forth in claim 5 or 6, wherein the first end portion includes a first end face, a second end face, and a second outer peripheral face, the first end face being opposite to the second end face, the second end face being connected to the first surface, the second outer peripheral face being connected between the first end face and the second end face,

be equipped with first sunken groove on the second peripheral face, first sunken groove includes first notch, second notch and first groove diapire, first notch runs through the second peripheral face, the second notch runs through the second terminal surface, first groove diapire with first notch is relative, the second stationary plane is located on the first groove diapire.

9. Charging coil according to any one of claims 5-8, wherein the first heat conducting part is adapted to the shape of the first fixing surface and/or the first part is adapted to the shape of the second fixing surface.

10. The charging coil of any one of claims 5-9, wherein the first fixation surface is coplanar with the second fixation surface.

11. The charging coil as set forth in any one of claims 5 to 9, wherein the first fixing surface is recessed toward a central axis of the winding portion with respect to the second fixing surface, and the first heat conductive member includes a first connection portion connected between the first heat conductive portion and the first portion.

12. The charging coil as set forth in any one of claims 1 to 11, wherein the winding portion includes a first surface, a second surface, and a first outer peripheral surface, the first surface and the second surface being located at both ends of an extending direction of the winding portion, respectively, the first outer peripheral surface being connected between the first surface and the second surface, the coil body being wound outside the first outer peripheral surface;

the second heat conduction part comprises a second part, the second part is in heat conduction connection with the first heat conduction part, and the second part is positioned on the side, facing the second surface, of the second heat conduction part.

13. The charging coil of claim 12, wherein the magnetic core includes a second end portion, the second end portion being coupled to a second surface of the winding portion, the second portion being fixedly coupled to the second end portion.

14. The charging coil as set forth in claim 13, wherein the winding portion includes a first fixing surface facing the coil body;

the second end part comprises a third fixing surface, and the orientation of the third fixing surface is the same as that of the first fixing surface;

the first heat conduction part is fixedly connected to the first fixing surface, and the second part is fixedly connected to the third fixing surface.

15. The charging coil of claim 14, wherein the third fixation surface is coplanar with the first fixation surface.

16. The charging coil of any one of claims 1-15, wherein the coil body is thermally conductively connected to the first thermally conductive portion.

17. The charging coil as set forth in any one of claims 1 to 16, wherein the first heat conductive member is in a sheet shape.

18. The charging coil of any one of claims 1-17, wherein the first thermally conductive member is an integrally formed member.

19. The charging coil of any one of claims 1-18, wherein a thickness of the first thermally conductive portion is greater than or equal to 20 microns and less than or equal to 50 microns, and/or

The second heat conduction part has a thickness of 20 micrometers or more and 50 micrometers or less.

20. The charging coil of any one of claims 1 to 19, wherein the material of the first thermally conductive portion is graphite, metal or a polymer material, and/or

The material of the second heat conduction part is graphite, metal or polymer material.

21. The charging coil according to any one of claims 1 to 20, wherein the first heat conductive member is plural, and the plural first heat conductive members are arranged in a circumferential direction of the magnetic core.

22. The charging coil as set forth in any one of claims 1 to 21, wherein the magnetic core includes a first end portion connected to one end of the extending direction of the winding portion, the first end portion including a first end face and a second end face connected to the winding portion, the first end face being opposite to the second end face,

the charging coil comprises a second heat conduction piece which is fixedly connected to the first end face.

23. The charging coil of any one of claims 1-22, wherein the first thermally conductive member has a thermal conductivity greater than a thermal conductivity of the magnetic core.

24. An electronic device, comprising:

a housing;

a charging coil disposed within the housing, the charging coil being as claimed in any one of claims 1 to 23.

25. The electronic device of claim 24, further comprising:

and the radiating fin is arranged in the shell, the second heat conduction part is in heat conduction connection with the radiating fin, and/or the coil body is in heat conduction connection with the radiating fin.

26. The electronic device of claim 25, further comprising:

and the radiating fin is fixedly connected to the circuit board.