Coil and wireless charging equipment

Abstract

The embodiment of the utility model relates to the technical field of wireless charging, and discloses a coil and wireless charging equipment, the coil comprises a coil body and a protective layer, the coil body comprises a conductive region and a non-conductive region, the non-conductive region is provided with an insulating substrate, the protective layer is arranged in the non-conductive region, and the insulating substrate is arranged in the non-conductive region. The protective layer is attached to the insulating substrate, and the protective layer is arranged on the inner side of the coil body. By means of the mode, deformation and damage caused by external force can be effectively prevented, and the coil body can be effectively protected in the whole machine puncture test process.

Description

Technical Field

[0001] This application relates to the field of wireless charging technology, and in particular to a coil and a wireless charging device. Background Technology

[0002] In the field of wireless charging technology, the design and structure of the charging coil have a significant impact on charging efficiency and device safety. Currently, the common structural design for wireless charging modules is a combination of FPC (flexible printed circuit board) and nanocrystals. In this design, the FPC adopts a structure without a copper-containing central area, meaning the central region consists only of a cover film and a substrate.

[0003] During the implementation of this application's embodiments, the inventors discovered that during whole-device battery puncture reliability testing, insufficient protection in the middle area makes it easy to directly puncture the nanocrystal surface, leading to magnetic leakage from the nanocrystals. This magnetic leakage phenomenon not only reduces charging efficiency but also affects the reliability and lifespan of the entire device. Utility Model Content

[0004] The main technical problem solved by the embodiments of this application is to provide a coil that can effectively prevent deformation and damage under external force, and can effectively protect the coil body during whole-machine puncture test.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application embodiment is: to provide a coil, including a coil body and a protective layer, wherein the coil body includes a conductive area and a non-conductive area, the non-conductive area is provided with an insulating substrate, the protective layer is disposed in the non-conductive area, the protective layer is attached to the insulating substrate, and the protective layer is disposed on the inner side of the coil body.

[0006] Optionally, the insulating substrate includes an upper insulating film and a lower substrate, wherein the upper insulating film and the lower substrate are stacked.

[0007] Optionally, the protective layer includes a first region and a second region, wherein the cross-section of the second region is gradient.

[0008] Optionally, a connection structure is provided between the protective layer and the insulating substrate, the connection structure including a plurality of bosses distributed in an array.

[0009] Optionally, the coil body is provided with a reinforcing frame, which is fixedly connected to the conductive area.

[0010] Optionally, the reinforcing frame is provided with multiple heat dissipation holes.

[0011] Optionally, the coil further includes an adhesive layer disposed between the protective layer and the insulating substrate.

[0012] Optionally, the edge of the non-conductive region is provided with reinforcing ribs, which are uniformly distributed along the circumference of the non-conductive region.

[0013] Optionally, the protective layer has a circular structure, and the diameter of the protective layer is smaller than the minimum size of the non-conductive region.

[0014] To solve the above-mentioned technical problems, another technical solution adopted in the embodiments of this application is to provide a wireless charging device, including any of the above-mentioned coils.

[0015] This application provides a coil, including a coil body and a protective layer. The coil body includes a conductive area and a non-conductive area. An insulating substrate is disposed in the non-conductive area, and the protective layer is disposed in the non-conductive area, bonded to the insulating substrate, and located inside the coil body. By setting a protective layer in the non-conductive area and bonding it to the insulating substrate inside the coil body, a novel coil protection structure is formed. The protective layer enhances the structural strength of the non-conductive area, effectively preventing deformation and damage under external forces. Furthermore, the bonding of the protective layer to the insulating substrate forms a double-layer protection structure, improving product reliability. In particular, it effectively protects the coil body during whole-machine puncture tests. Finally, the structural design of placing the protective layer inside the coil body provides protection without affecting the overall size and installation requirements of the coil, ensuring product versatility. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a schematic diagram of the coil in an embodiment of this application;

[0018] Figure 2 This is another schematic diagram of the coil in the embodiment of this application. Detailed Implementation

[0019] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "vertical," "horizontal," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0021] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0022] Please see Figure 1 This embodiment provides a coil structure for use in the field of wireless charging. The coil 1 includes a coil body 100 and a protective layer 200.

[0023] The coil body 100 is made of FPC (flexible printed circuit board) and includes a conductive area 110 and a non-conductive area 120. The conductive area 110 is composed of copper foil wires and is used to realize the electromagnetic induction function of wireless charging. The non-conductive area 120 is located at the center of the coil 1. The non-conductive area 120 does not have copper foil wires and only has an insulating substrate 121.

[0024] In this embodiment, the insulating substrate 121 adopts a double-layer structure design, including an upper insulating film (not shown) and a lower substrate (not shown). The upper insulating film is made of polyimide material with a thickness of 12-15 micrometers; the lower substrate 1212 is also made of polyimide material with a thickness of 20-25 micrometers. The upper insulating film and the lower substrate are laminated and connected by a hot-pressing process to form an integral insulating structure.

[0025] The protective layer 200 is made of PET (polyethylene terephthalate) material with a thickness of 75-100 micrometers. The protective layer 200 is tightly bonded to the insulating substrate 121 via a bonding process and is located on the inner side of the coil body 100. This arrangement effectively prevents damage to the coil structure during whole-cell battery puncture testing.

[0026] In a preferred embodiment, the protective layer 200 is slightly smaller than the area of ​​the non-conductive region 120. This design ensures adequate protection while avoiding material waste. A reliable connection between the protective layer 200 and the insulating substrate 121 can be achieved using a pressure-sensitive adhesive. The selected pressure-sensitive adhesive has a thickness of 25-30 micrometers and exhibits good bonding strength and temperature resistance.

[0027] This embodiment significantly improves the reliability of the product in whole-cell battery puncture tests by adding a protective layer to the non-conductive area. Tests show that the nanocrystalline magnetic core remains intact and exhibits no magnetic leakage when subjected to a 200N puncture force using the coil structure of this embodiment, confirming the effectiveness of the structural design.

[0028] This embodiment can solve the technical problem that the middle area of ​​the FPC is easily punctured in the prior art, improve the overall reliability of the wireless charging module, and has good engineering application value.

[0029] Please see Figure 2 The protective layer 200 includes a first region 210 and a second region 220. The first region 210 has a planar structure and uniform thickness, providing basic protection for the non-conductive region 120. The second region 220 is located at the edge of the protective layer 200 and has a gradually thinning cross-section, specifically, it gradually thins from the center to the edge. This gradual design makes the transition between the protective layer 200 and the insulating substrate 121 smoother, effectively reducing stress concentration. In a preferred embodiment, the gradient angle of the second region 220 is 30-45 degrees, a range that ensures structural strength while facilitating manufacturing.

[0030] To further enhance the connection strength between the protective layer 200 and the insulating substrate 120, this embodiment provides a connection structure (not shown) between them. The connection structure includes multiple bosses arranged in an array. Specifically, in some preferred embodiments, the height of the bosses is 50-80 micrometers, the bottom diameter is 100-150 micrometers, and the spacing between adjacent bosses is 200-300 micrometers. The bosses are formed using a hot-pressing process, and their material is the same as that of the protective layer 200. This arrangement significantly increases the contact area and improves connection reliability.

[0031] In a preferred embodiment of this implementation, the bosses are arranged in a regular hexagonal array, which can achieve the maximum contact area within a limited space.

[0032] In some preferred embodiments, a reinforcing frame (not shown) is provided on the outer periphery of the coil body 100. The reinforcing frame is made of metal, preferably aluminum alloy. The reinforcing frame is fixedly connected to the conductive area 110 by welding, providing not only mechanical support but also serving as a heat dissipation channel.

[0033] Specifically, the reinforcing frame is designed with multiple heat dissipation holes, which are arranged in a regular pattern. In a preferred embodiment, the heat dissipation holes adopt an elliptical design to achieve optimal heat dissipation while ensuring structural strength.

[0034] In some embodiments, to ensure a reliable connection between the protective layer 200 and the insulating substrate 121, an adhesive layer (not shown) is added, which has excellent temperature resistance and bonding strength.

[0035] In some embodiments, reinforcing ribs (not shown) are provided at the edge of the non-conductive region 120. The reinforcing ribs are integrally formed from the same material as the insulating substrate 121 and are uniformly distributed along the circumference of the non-conductive region. In a preferred embodiment, the number of reinforcing ribs is 8-12, and the cross-section of each reinforcing rib is triangular. This arrangement improves the deformation resistance of the non-conductive region.

[0036] In some preferred embodiments, the protective layer 200 adopts a circular structure design, the diameter of which is smaller than the minimum size of the non-conductive region 120. Specifically, if the non-conductive region is rectangular with a minimum side length of 30 mm, the diameter of the protective layer is designed to be 28 mm. This dimensional relationship ensures that the protective layer has sufficient positioning margin during installation, while preventing the protective layer from exceeding the range of the non-conductive region.

[0037] This application provides a coil 1, including a coil body 100 and a protective layer 200. The coil body 100 includes a conductive region 110 and a non-conductive region 120. An insulating substrate is disposed in the non-conductive region 120. The protective layer 200 is attached to the insulating substrate and is located inside the coil body 100. By providing the protective layer 200 in the non-conductive region 120 and attaching it to the insulating substrate, the coil body 100 is positioned within the non-conductive region 120. On the other hand, a new type of coil protection structure is formed. The setting of the protective layer 200 enhances the structural strength of the non-conductive area 120, effectively preventing deformation and damage under external force. Furthermore, the bonding setting of the protective layer 200 with the insulating substrate forms a double-layer protection structure, which improves the reliability of the product. In particular, it can effectively protect the coil body 100 during the whole machine puncture test. Finally, the structural design of setting the protective layer 200 on the inner side of the coil body 100 provides protection without affecting the overall size and installation requirements of the coil, ensuring the versatility of the product.

[0038] This embodiment provides a complete wireless charging device that integrates the advantages of the aforementioned embodiments. In addition to the improved coil structure described above, the device also includes the following functional units:

[0039] Magnetic shielding layer: Made of nanocrystalline material with a thickness of 0.2-0.3 mm, used to confine the magnetic field distribution.

[0040] Thermal conductive structure: Thermally conductive silicone is placed between the reinforcing frame and the housing to improve heat dissipation efficiency.

[0041] Protective structure: A waterproof sealing ring has been added to the shell design to achieve an IP54 protection rating.

[0042] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A coil, characterized by, The coil comprises: a coil body comprising a conductive region and a non-conductive region, the non-conductive region being provided with an insulating base; a protective layer provided on the non-conductive region, the protective layer being provided in close contact with the insulating base, and the protective layer being provided on the inner side of the coil body.

2. The coil according to claim 1, wherein the insulating base comprises an upper insulating film and a lower base material, and the upper insulating film and the lower base material are provided in a stacked manner.

3. The coil according to claim 1, wherein the protective layer comprises a first region and a second region, and the second region has a gradually changing cross section.

4. The coil according to claim 1, wherein a connecting structure is provided between the protective layer and the insulating base, and the connecting structure comprises a plurality of protrusions arranged in an array.

5. The coil according to claim 1, wherein the coil body is provided with a reinforcing frame, and the reinforcing frame is fixedly connected to the conductive region.

6. The coil according to claim 5, wherein a plurality of heat dissipation holes are provided on the reinforcing frame.

7. The coil according to claim 6, wherein the coil further comprises an adhesive layer provided between the protective layer and the insulating base.

8. The coil according to claim 1, wherein a reinforcing rib is provided on the edge of the non-conductive region, and the reinforcing rib is uniformly distributed along the circumference of the non-conductive region.

9. The coil according to claim 1, wherein the protective layer has a circular structure, and the diameter of the protective layer is smaller than the minimum size of the non-conductive region.

10. A wireless charging device, comprising: The coil comprises any one of claims 1-9.

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