A wireless charging coil and a wireless charging system

Abstract

This invention provides a wireless charging coil and a wireless charging system, relating to the field of wireless charging technology. The wireless charging coil includes a coil body and a magnetic shielding component. The coil body has a single-layer structure and includes a first lead extending from the inner side to the outer side of the coil body. The magnetic shielding component is disposed on one end face of the coil body along its thickness direction. The magnetic shielding component has a receiving portion, one end of which extends along the extension direction of the first lead to the outer peripheral sidewall of the magnetic shielding component, and a clearance opening is formed on the outer peripheral sidewall. The receiving portion is configured to receive the first lead, and the first lead passes through the clearance opening. The wireless charging coil of this invention can effectively reduce the thickness of the wireless charging coil.

Description

Technical Field

[0001] This utility model relates to the field of wireless charging technology, and more specifically, to a wireless charging coil and a wireless charging system. Background Technology

[0002] With the development of new energy technologies, wireless charging has been widely used. The wireless charging coil, as a key component, consists of a coil body positioned above a magnetic shielding sheet. The magnetic shielding sheet constrains the direction of magnetic flux and reduces eddy current losses, while the coil body transmits energy through an alternating magnetic field.

[0003] However, the coil body of some wireless charging coils generally adopts a multi-layer structure, and one of the leads of the coil body needs to be bent and extended from the end face of the coil body away from the magnetic shielding component, resulting in a large total thickness of the wireless charging coil, which in turn leads to a large size of the wireless charging transmitter or receiver. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a wireless charging coil and a wireless charging system.

[0005] In a first aspect, the present invention provides a wireless charging coil, including a coil body and a magnetic shielding component; the coil body is a single-layer structure and includes a first lead extending from the inner side to the outer side of the coil body; the magnetic shielding component is disposed on one end face of the coil body along the thickness direction; the magnetic shielding component is provided with a receiving portion, one end of the receiving portion extending along the extension direction of the first lead to the peripheral sidewall of the magnetic shielding component, and forming a clearance opening on the peripheral sidewall; the receiving portion is configured to receive the first lead and allow the first lead to pass through the clearance opening.

[0006] Optionally, the receiving portion is a notch structure provided on the magnetic shielding member, and the notch structure penetrates the magnetic shielding member. Optionally, the receiving portion is a slotted structure disposed on the magnetic shielding member, and the size of the slotted structure is smaller than the size of the magnetic shielding member along the thickness direction of the receiving portion.

[0007] Optionally, the coil body further includes a winding portion and a second lead wire. The winding portion is spiral in shape, and its projection on the magnetic shielding member is located within the outer contour range of the magnetic shielding member. One end of the winding portion located inside the coil body is connected to the first lead wire. One end of the second lead wire is located outside the coil body, and the other end extends away from the winding portion.

[0008] Optionally, the first lead wire, the winding portion, and the second lead wire are integrally formed.

[0009] Optionally, the magnetic shielding component is disc-shaped, and the outer contour of the magnetic shielding component, excluding the receiving portion, coincides with the outer contour of the winding portion along the thickness direction of the coil body.

[0010] Optionally, there is a gap between the first lead wire and the inner wall of the receiving portion.

[0011] Optionally, the wireless charging coil further includes a mounting plate disposed on the side of the magnetic shield away from the coil body.

[0012] Optionally, when the receiving portion is the notch structure, there is a gap between the first lead wire and the mounting plate.

[0013] Secondly, this utility model provides a wireless charging system, including a wireless charging transmitter and a wireless charging receiver; at least one of the wireless charging transmitter and the wireless charging receiver has a wireless charging coil as described above.

[0014] Compared with related technologies, the beneficial effects of this utility model are as follows: The main body of the wireless charging coil has a single-layer structure, which reduces the thickness of the wireless charging coil compared to a multi-layer structure. At the same time, the magnetic shielding component has a receiving part, and one end of the receiving part extends to the outer side wall of the magnetic shielding component along the extension direction of the first lead wire, forming a clearance opening on the outer side wall. In this way, when the coil body is installed on the magnetic shielding component, the first lead wire of the coil body can be received in the receiving part and naturally extend from the side of the magnetic shielding component. This avoids the first lead wire extending from the inside to the outside of the coil body from bending and extending from the end face of the coil body away from the magnetic shielding component, thereby further reducing the thickness of the wireless charging coil and ultimately reducing the size of the wireless charging transmitter or receiver. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the wireless charging coil according to an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the coil body structure according to an embodiment of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the coil body structure according to an embodiment of the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the structure of the wireless charging coil according to an embodiment of the present invention. Figure 2 .

[0016] Explanation of reference numerals in the attached figures: 100. Coil body; 101. First lead wire; 102. Winding part; 103. Second lead wire; 200. Magnetic shielding component; 201. Receiving part; 2011. Notch structure; 2012. Slotted structure; 202. Clearance opening; 300. Mounting plate. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0018] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0019] In the description of this utility model, it should be understood that the terms "height", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] The wireless charging coil of this utility model embodiment includes a coil body 100 and a magnetic shielding member 200. The coil body 100 has a single-layer structure and includes a first lead wire 101 extending from the inner side to the outer side of the coil body 100. The magnetic shielding member 200 is disposed on one end face of the coil body 100 along the thickness direction. The magnetic shielding member 200 is provided with a receiving portion 201, one end of which extends along the extending direction of the first lead wire 101 to the outer peripheral sidewall of the magnetic shielding member 200, and a clearance opening 202 is formed on the outer peripheral sidewall. The receiving portion 201 is configured to receive the first lead wire 101 and allow the first lead wire 101 to pass through through the clearance opening 202.

[0021] Specifically, such as Figure 1 As shown, the coil body 100 is a single-layer structure, which is formed by winding a copper wire from the inside to the outside. Its shape can be roughly circular, roughly square, etc., and includes a first lead wire 101 extending from the inside to the outside of the coil body 100; the magnetic shielding member 200 is a sheet structure, which is provided with a receiving part 201. One end of the receiving part 201 extends to the outer side wall of the magnetic shielding member 200 along the extension direction of the first lead wire 101, and a clearance opening 202 is formed on the outer side wall; when the coil body 100 is bonded to one end face of the magnetic shielding member 200 along the thickness direction, the receiving part 201 can accommodate the first lead wire 101, and the first lead wire 101 can pass through the clearance opening 202.

[0022] In this embodiment, the coil body 100 of the wireless charging coil has a single-layer structure, which reduces the thickness of the wireless charging coil compared to a multi-layer structure. At the same time, the magnetic shielding member 200 is provided with a receiving portion 201, and one end of the receiving portion 201 extends to the outer sidewall of the magnetic shielding member 200 along the extension direction of the first lead 101, and a clearance opening 202 is formed on the outer sidewall. In this way, when the coil body 100 is installed on the magnetic shielding member 200, the first lead 101 of the coil body 100 can be accommodated in the receiving portion 201 and naturally extend from the side of the magnetic shielding member 200. This avoids the first lead 101 extending from the inner side of the coil body 100 to the outer side from bending and extending from the end face of the coil body 100 away from the magnetic shielding member 200, thereby further reducing the thickness of the wireless charging coil and ultimately reducing the size of the wireless charging transmitter or wireless charging receiver.

[0023] Optionally, the receiving portion 201 is a notch structure 2011 provided on the magnetic shielding member 200, and the notch structure 2011 penetrates the magnetic shielding member 200. Specifically, such as Figure 2 As shown, the magnetic shielding component 200 is a sheet structure with a notch structure 2011 on it. The notch structure 2011 is rectangular in shape and penetrates the magnetic shielding component 200 along the thickness direction.

[0024] In this optional embodiment, due to the design of the notch structure 2011, the first lead wire 101 no longer needs to be bent upwards to avoid obstacles, but can be directly embedded in the notch structure 2011 along the original plane and led out from the side of the magnetic shielding component 200, thereby completely eliminating the extra space occupied by the first lead wire 101 in the thickness direction; at the same time, the notch structure 2011 penetrates through the magnetic shielding component 200, which is simple to process and can effectively reduce processing costs compared with other slot-type methods.

[0025] Optionally, the receiving portion 201 is a slotted structure 2012 provided on the magnetic shielding member 200, and the size of the slotted structure 2012 is smaller than the size of the magnetic shielding member 200 along the thickness direction of the receiving portion 201.

[0026] Specifically, such as Figure 3 As shown, the magnetic shielding component 200 is a sheet-like structure with a slotted structure 2012 on one end face along the thickness direction. The slotted structure 2012 is rectangular, and the opening of the slotted structure 2012 extends to the edge of the magnetic shielding component 200. Along the thickness direction of the receiving portion 201, the size of the slotted structure 2012 is smaller than the size of the magnetic shielding component 200. In other words, the slotted structure 2012 does not penetrate the magnetic shielding component 200.

[0027] In this optional embodiment, due to the design of the slotted structure 2012, the first lead wire 101 no longer needs to be bent upwards to avoid obstacles. Instead, it can be directly embedded into the notch structure 2011 along the original plane and led out from the side of the magnetic shielding component 200, thereby completely eliminating the extra space occupied by the first lead wire 101 in the thickness direction. At the same time, the slotted structure 2012 adds two additional sidewalls to the surface of the magnetic shielding component 200, which effectively expands the effective surface area of ​​the magnetic shielding sheet, making the magnetic field lines convergence path more sufficient, thereby improving the magnetic flux confinement capability and reducing eddy current loss without increasing the outer diameter.

[0028] Optionally, the coil body 100 further includes a winding portion 102 and a second lead wire 103. The winding portion 102 is spiral in shape, and its projection on the magnetic shielding member 200 is located within the outline of the magnetic shielding member 200. One end of the winding portion 102 located inside the coil body 100 is connected to the first lead wire 101. One end of the second lead wire 103 is connected to the end of the winding portion 102 located outside the coil body 100, and the other end extends away from the winding portion 102.

[0029] Specifically, such as Figure 1 As shown, the winding portion 102 is spiral in shape, with one end located inside the coil body 100 connected to the first lead 101; one end of the second lead 103 is connected to the end of the winding portion 102 located outside the coil body 100, and the other end extends away from the magnetic shielding member 200; and after the coil body 100 is installed, the projection of the winding portion 102 on the magnetic shielding member 200 is located within the outer contour range of the magnetic shielding member 200.

[0030] In this optional embodiment, since the projection of the winding portion 102 on the magnetic shielding member 200 falls entirely within the outer contour range of the magnetic shielding member 200, most of the magnetic lines of force are covered by the entire magnetic shielding member 200, thereby ensuring that most of the magnetic flux is confined directly below the coil body 100, reducing interference to surrounding metal parts and reducing eddy current losses.

[0031] Meanwhile, since the second lead 103 is directly led out from the outermost end of the winding part 102 and extends away from the magnetic shielding member 200, it is not necessary to open a corresponding receiving space on the magnetic shielding member 200. Compared with opening a receiving space to accommodate the second lead 103, the leakage magnetic flux and eddy current loss of the magnetic shielding member 200 decrease simultaneously.

[0032] Optionally, the first lead 101, the winding portion 102, and the second lead 103 are integrally formed.

[0033] Optionally, the magnetic shielding member 200 is disc-shaped, and the outer contour of the magnetic shielding member 200, excluding the receiving portion 201, coincides with the outer contour of the winding portion 102 along the thickness direction of the coil body 100.

[0034] Specifically, such as Figure 1 As shown, the magnetic shielding component 200 is generally disc-shaped and has a notch structure 2011. The outer contour (i.e., outer edge) of the magnetic shielding component 200, excluding the receiving part 201, coincides with the outer contour (i.e., outer edge) of the winding part 102 along the thickness direction of the coil body 100.

[0035] In this optional embodiment, since the magnetic shielding member 200 is disc-shaped and its outer contour, except for the receiving portion 201, completely coincides with the outer contour of the winding portion 102 in the thickness direction, the magnetic lines of force generated by the coil body 100 can be confined within the disc magnetic shielding member 200 within the same circumference range, forming an axisymmetric magnetic circuit. This axisymmetric structure minimizes the rate of change of coupling area when the wireless charging transmitter and the wireless charging receiver rotate in the horizontal plane or are radially offset, thus inherently possessing anti-offset advantages and maintaining stable transmission efficiency.

[0036] Optionally, there is a gap between the first lead-out line 101 and the inner wall of the receiving part 201.

[0037] Specifically, such as Figure 1 As shown, the receiving part 201 has a notch structure 2011, and there is a gap between the first lead-out line 101 and the two side walls opposite to the receiving part 201. The size of the gap is selected according to actual needs.

[0038] In this optional embodiment, since there is a gap between the first lead wire 101 and the inner wall of the receiving part 201, the wires of the coil body 100 can extend freely within the gap when they heat up and expand during operation, and also contract synchronously when cooling, thereby offsetting the mechanical stress generated by the thermal cycle and preventing the magnetic shielding component 200 from cracking due to compression. At the same time, the existence of this gap allows the heat generated by the coil body 100 to be quickly discharged and radiated outward with the help of the large surface area of ​​the disc magnetic shielding sheet, reducing the local temperature rise of the first lead wire 101, thereby improving the thermal reliability and heat dissipation efficiency of the wireless charging coil while ensuring a compact structure.

[0039] Optionally, the material of the magnetic shielding element 200 may include ferrite material.

[0040] In this optional embodiment, due to the composite characteristics of high magnetic permeability and low electrical conductivity of ferrite material, the magnetic field lines can be effectively constrained to the height directly below the coil, significantly reducing magnetic leakage. At the same time, the high resistivity of ferrite material blocks the eddy current path, making the eddy current loss much lower than that of metal magnetic shielding sheets, thus generating less heat and achieving higher efficiency under the same working magnetic flux. Furthermore, the thermal expansion coefficients of ferrite material and coil body are close, resulting in low interface stress when the temperature changes, which can maintain long-term adhesion without warping. Ultimately, while ensuring an ultra-thin structure, high magnetic shielding efficiency, low loss, and high thermal stability are achieved, providing material-level protection for the miniaturization and efficient operation of wireless charging coils.

[0041] Optionally, the wireless charging coil also includes a mounting plate 300, which is disposed on the side of the magnetic shielding member 200 away from the coil body 100.

[0042] Specifically, the mounting plate 300 is a metal plate, preferably an aluminum plate; such as Figure 4 As shown, both the magnetic shielding component 200 and the mounting plate 300 are disc-shaped and have the same size. During installation, the mounting plate 300 and the coil body 100 are located on both sides of the magnetic shielding component 200 along the thickness direction.

[0043] In this optional embodiment, since the mounting plate 300 is provided on the side of the magnetic shielding component 200 away from the coil body 100, the high thermal resistance of the magnetic shielding component 200 is instantly short-circuited by the metal or high thermal conductivity substrate of the mounting plate 300. The heat generated by the coil body 100 and the magnetic shielding component 200 is first conducted vertically along the thickness direction to the mounting plate 300, and then rapidly diffused laterally with the help of its large area plane, causing the temperature of the coil body 100 to drop. At the same time, the mounting plate 300 acts as a rigid support, which offsets the defects of ferrite being brittle and easily cracked. When subjected to impact or thermal expansion and contraction, it absorbs stress through its own micro-deformation, thus preventing the magnetic shielding component 200 from breaking.

[0044] Optionally, when the receiving part 201 is a notch structure 2011, there is a gap between the first lead wire 101 and the mounting plate 300.

[0045] In this optional embodiment, since the receiving part 201 is designed as a notch that passes through the side edge of the magnetic shielding component 200, the first lead wire 101 is suspended above the mounting plate 300 after sinking through the notch, and an air gap is naturally maintained between it and the mounting plate 300. This gap firstly provides free expansion and contraction allowance for thermal expansion and contraction, and avoids the first lead wire 101 being hard squeezed when it is heated and expanded, which would cause the insulation layer to wear.

[0046] The wireless charging system of this utility model embodiment includes a wireless charging transmitter and a wireless charging receiver; at least one of the wireless charging transmitter and the wireless charging receiver has a wireless charging coil as described above.

[0047] Specifically, the wireless charging transmitter and the wireless charging receiver have the same structure and size, and both have the aforementioned wireless charging coil inside; when both are working, the power of the wireless charging system can preferably reach 1200W.

[0048] The wireless charging system of this embodiment has the same beneficial effects as the wireless charging coil described above compared to the prior art, so it will not be described again here.

[0049] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A wireless charging coil, characterized in that, The device includes a coil body (100) and a magnetic shielding component (200). The coil body (100) is a single-layer structure and includes a first lead wire (101) extending from the inner side of the coil body (100) to the outer side. The magnetic shielding component (200) is disposed on one end face of the coil body (100) along the thickness direction. The magnetic shielding component (200) is provided with a receiving portion (201), one end of which extends along the extension direction of the first lead wire (101) to the outer sidewall of the magnetic shielding component (200), and a clearance opening (202) is formed on the outer sidewall. The receiving portion (201) is configured to receive the first lead wire (101) and allow the first lead wire (101) to pass through through the clearance opening (202).

2. The wireless charging coil according to claim 1, characterized in that, The receiving portion (201) is a notch structure (2011) provided on the magnetic shielding member (200), and the notch structure (2011) penetrates the magnetic shielding member (200).

3. The wireless charging coil according to claim 1, characterized in that, The receiving portion (201) is a slotted structure (2012) provided on the magnetic shielding member (200). Along the thickness direction of the receiving portion (201), the size of the slotted structure (2012) is smaller than the size of the magnetic shielding member (200).

4. The wireless charging coil according to claim 1, characterized in that, The coil body (100) further includes a winding portion (102) and a second lead (103). The winding portion (102) is spiral in shape, and its projection on the magnetic shield (200) is located within the outer contour of the magnetic shield (200). One end of the winding portion (102) located inside the coil body (100) is connected to the first lead (101). One end of the second lead (103) is connected to the end of the winding portion (102) located outside the coil body (100), and the other end extends away from the winding portion (102).

5. The wireless charging coil according to claim 4, characterized in that, The first lead wire (101), the winding portion (102), and the second lead wire (103) are integrally formed.

6. The wireless charging coil according to claim 4, characterized in that, The magnetic shielding component (200) is disc-shaped, and the outer contour of the magnetic shielding component (200) other than the receiving portion (201) coincides with the outer contour of the winding portion (102) along the thickness direction of the coil body (100).

7. The wireless charging coil according to claim 1, characterized in that, There is a gap between the first lead-out line (101) and the inner wall of the receiving part (201).

8. The wireless charging coil according to claim 2, characterized in that, It also includes a mounting plate (300) disposed on the side of the magnetic shielding member (200) away from the coil body (100).

9. The wireless charging coil according to claim 8, characterized in that, When the receiving part (201) is the notch structure (2011), there is a gap between the first lead wire (101) and the mounting plate (300).

10. A wireless charging system, characterized in that, It includes a wireless charging transmitter and a wireless charging receiver; at least one of the wireless charging transmitter and the wireless charging receiver has a wireless charging coil as described in any one of claims 1 to 9.

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