Charging coil module and electronic device

Abstract

The utility model relates to wireless charging technical field discloses a kind of charging coil module and electronic equipment.In the charging coil module provided in the utility model, the material with stronger anti-puncture ability can be used to cover charging coil, so that the structural strength of charging coil module can be effectively improved, and the anti-puncture weak area of charging coil module is reduced, so as to improve the anti-puncture ability of charging coil module.When the charging coil module is applied to electronic equipment, the battery of electronic equipment can be protected by charging coil module, so as to reduce the puncture risk of battery and improve the safety of electronic equipment.Compared with the charging coil module of prior art, its thickness will not increase, so it is beneficial to realize the thin design of electronic equipment with the charging coil module.

Description

Technical Field

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

[0002] As electronic devices move towards thinner designs, the thickness of the various stacked structures within them is also decreasing. For example, in recent years, the thickness of the back cover of electronic devices has been gradually reduced. While reducing the thickness of the back cover facilitates a thinner overall design, it also introduces a risk of puncture to the battery, posing a significant safety hazard. Utility Model Content

[0003] This invention provides a charging coil module and an electronic device that improves the puncture resistance of the electronic device while meeting the requirements for a thinner overall design.

[0004] Firstly, this utility model provides a charging coil module, which includes a charging coil and a covering layer. The charging coil includes a coil body and a hollow area, with the coil surrounding the hollow area. The covering layer has a puncture resistance greater than or equal to 0.5 N / μm, meaning it has strong puncture resistance. Furthermore, the covering layer includes a first part and a second part connected together; the first part covers the coil body, and the second part fills the hollow area. The design of the charging coil module provided by this utility model effectively improves the structural strength of the charging coil module and reduces weak areas for puncture resistance, thereby enhancing its puncture resistance. When this charging coil module is applied to electronic devices, it can protect the battery, reducing the risk of battery puncture and improving the safety of the electronic device. Moreover, compared to existing charging coil modules, its thickness is not increased, thus facilitating the thinner design of electronic devices using this charging coil module.

[0005] In one possible implementation of this invention, the charging coil includes a multi-turn coil with a gap between adjacent turns. A first portion of the aforementioned covering layer further fills the gap, and the thickness of the first portion at the gap is greater than the sum of the thicknesses of the first portions covering the coil. This improves the puncture resistance at the gaps of the charging coil module, thereby reducing the puncture-resistant weak areas of the charging coil module.

[0006] Furthermore, in one possible implementation of this invention, the surface of the first part is a flat surface. This allows the thickness of the first part filling the gap between the two coil turns to be maximized, given a fixed thickness of the charging coil module. This further enhances the puncture resistance of the gap, which in turn improves the overall puncture resistance of the charging coil module.

[0007] In one possible implementation of this invention, the thickness of the second part is greater than the thickness of the first part along the thickness direction of the charging coil module. This design improves the puncture resistance of the hollow area of ​​the charging coil module, thereby reducing the puncture-resistant weak areas of the charging coil module.

[0008] In one possible implementation of this invention, the first and second portions of the cover layer are coplanar on the same side along the thickness direction of the charging coil module. This further improves the uniformity of thickness throughout the charging coil module and maximizes the thickness of the second portion while maintaining a fixed thickness, thereby reducing weak puncture-resistant areas and further enhancing the overall puncture resistance of the charging coil module.

[0009] In one possible implementation of this invention, the charging coil module further includes a nanocrystalline ribbon and a protective layer. Along the thickness direction of the charging coil module, the nanocrystalline ribbon is spaced apart from the charging coil, and is connected to a cover layer. The protective layer covers the side of the nanocrystalline ribbon facing away from the cover layer. This technical solution not only enhances the magnetic permeability of the charging coil by utilizing the nanocrystalline ribbon, thereby improving the charging performance of the charging coil module, but also protects the nanocrystalline ribbon using the cover layer and protective layer, thus improving the structural reliability of the charging coil module. Furthermore, since both the cover layer and the protective layer have high impact resistance, they help improve the overall puncture resistance of the charging coil module.

[0010] In one possible implementation of this invention, the charging coil module further includes a nanocrystalline ribbon and two protective layers. These two protective layers may include a first protective layer and a second protective layer. The nanocrystalline ribbon is located between the first and second protective layers, and both layers cover the nanocrystalline ribbon. At least one of the first and second protective layers has a puncture resistance greater than or equal to 0.5 N / μm. Furthermore, the first protective layer is bonded to the cover layer to improve the structural reliability of the charging coil module. Using this design, since both the cover layer and at least one protective layer have strong puncture resistance, stacking them further enhances the puncture resistance of the charging coil module, thereby reducing the risk of puncture to the battery of electronic devices using this charging coil module and improving the safety of the electronic devices.

[0011] This invention does not limit the materials of the covering layer and the protective layer. For example, in one possible implementation of this invention, the material of the protective layer includes at least one of ultra-high molecular weight polyethylene, polycarbonate, thermoplastic polyurethane rubber, polyoxymethylene, polycarbonate-modified polyurethane dispersion, polyphenylene ether, carbon fiber and polyphenylene sulfide resin.

[0012] In addition, the material of the cover layer may also include at least one of ultra-high molecular weight polyethylene, polycarbonate, thermoplastic polyurethane rubber, polyoxymethylene, polycarbonate-modified polyurethane dispersion, polyphenylene ether, carbon fiber, and polyphenylene sulfide resin. It should be noted that the material of the cover layer may be the same as or different from that of the protective layer to improve the design flexibility of the charging coil module.

[0013] Secondly, this utility model also provides a charging coil module, which includes a substrate and a charging coil. The substrate includes multiple grooves, and the charging coil includes multiple turns of coil, each turn corresponding to one of the grooves. Furthermore, the substrate has a puncture resistance greater than or equal to 0.5 N / μm. Using the design of the charging coil module provided by this utility model, since the charging coil is disposed in the grooves of the substrate, that is, the charging coil is embedded in the substrate, or it can be understood that the gap between any two adjacent turns of the multi-turn coil is filled by the substrate, thus allowing the substrate to enclose the charging coil. Furthermore, because the thickness of the charging coil module is relatively uniform throughout, it not only effectively improves the structural strength of the charging coil module but also reduces the weak areas for puncture resistance, thereby improving the puncture resistance of the charging coil module. Therefore, when this charging coil module is applied to electronic devices, it can protect the battery of the electronic device, thereby reducing the risk of battery puncture and improving the safety of the electronic device. Furthermore, its thickness will not increase compared to existing charging coil modules, thus facilitating the thinner design of electronic devices that utilize this charging coil module.

[0014] In one possible implementation of this invention, along the thickness direction of the substrate, the charging coil includes a first group of coils and a second group of coils stacked and spaced apart. The substrate also includes vias, and the first group of coils and the second group of coils are connected through the vias to form a complete charging coil. It can be seen that the charging coil module provided by this invention adopts a design method of embedding the charging coil in the substrate, which not only improves the puncture resistance of the entire charging coil module but also meets the design requirements of the charging coil, thus ensuring the wireless charging performance of the charging coil module.

[0015] In one possible implementation of this invention, the substrate completely encapsulates the charging coil. This not only improves the overall puncture resistance of the charging coil module but also provides oxidation protection for the charging coil using the substrate.

[0016] In one possible implementation of this invention, the surface of the charging coil is exposed on the surface of the substrate, and the surface of the charging coil includes an anti-oxidation layer. In this implementation, the charging coil can be protected against oxidation by the anti-oxidation layer on its surface. This ensures the chemical stability of the charging coil while avoiding increasing the overall thickness of the charging coil module, thereby facilitating the thinner design of electronic devices using this charging coil module.

[0017] Thirdly, this utility model also provides an electronic device, which includes a battery, a back cover, and a charging coil module as described in the first or second aspect. The charging coil module is located between the battery and the back cover. In the electronic device provided by this utility model, because the charging coil module has high puncture resistance, it can be used to protect the battery, thereby reducing the risk of battery puncture and improving the safety of the electronic device. Furthermore, since no additional puncture-resistant structure is required in the electronic device, it is beneficial for meeting the requirements of thinner design.

[0018] In one possible implementation of this invention, the charging coil module completely covers the battery. This increases the protection range of the battery provided by the charging coil module, thereby further reducing the risk of battery puncture. Attached Figure Description

[0019] Figure 1 A schematic diagram of the structure of an electronic device;

[0020] Figure 2 This is a cross-sectional view of an electronic device in the prior art;

[0021] Figure 3 A schematic diagram of a stacked structure of a charging coil module provided in an embodiment of this utility model;

[0022] Figure 4 A schematic diagram of the structure of a charging coil provided in an embodiment of this utility model;

[0023] Figure 5 for Figure 3 The diagram shows a BB cross-sectional view of the charging coil module.

[0024] Figure 6 A flowchart illustrating the processing of a charging coil provided in an embodiment of this utility model;

[0025] Figure 7This is another structural schematic diagram of the charging coil module provided in an embodiment of the present utility model;

[0026] Figure 8a This is a schematic diagram of another stacked structure of the charging coil module provided in an embodiment of the present utility model;

[0027] Figure 8b This is a schematic diagram of another stacked structure of the charging coil module provided in an embodiment of the present utility model;

[0028] Figure 9 This is another structural schematic diagram of the charging coil module provided in an embodiment of the present utility model;

[0029] Figure 10 A processing flowchart of a charging coil module provided in an embodiment of this utility model;

[0030] Figure 11 This is another structural schematic diagram of the charging coil module provided in an embodiment of the present utility model;

[0031] Figure 12 This is another structural schematic diagram of the charging coil module provided in an embodiment of the present utility model;

[0032] Figure 13 A cross-sectional view of an electronic device provided in an embodiment of this utility model.

[0033] Figure label:

[0034] 100 - Electronic device; 10 - Back cover; 20 - Battery; 30 - Puncture-resistant structure; 40 - Charging coil module;

[0035] 1-Charging coil; 11-Coil; 12-Hollow area; 13-Substrate layer; 14-Copper layer; 15-Via; 16-Gap; 1a-First group of coils;

[0036] 1b - Second coil group; 2 - Covering layer; 21 - First part; 22 - Second part; 3 - Nanocrystalline ribbon; 4 - Protective layer; 4a - First protective layer;

[0037] 4b - Second protective layer; 5 - Substrate; 51 - Trench; 52 - First base layer; 53 - Second base layer; 54 - Third base layer. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The terms describing position and direction in the embodiments of this utility model are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the protection scope of this utility model. The accompanying drawings of the embodiments of this utility model are for illustrating relative positional relationships only and do not represent actual proportions.

[0039] It should be noted that specific details are set forth in the following description to facilitate understanding of the present invention. However, embodiments of the present invention can be implemented in many ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the embodiments of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] In this invention, the electronic device can be, exemplarily, a mobile phone, a personal digital assistant (PDA), a tablet computer, headphones, or wearable devices such as a smartwatch, smart bracelet, fitness tracker, smart wristband, or smart glasses. For ease of explanation, the following embodiments of this invention will use a mobile phone as an example.

[0041] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of an electronic device, and Figure 1 This can be used to demonstrate the structure of one side of the back cover 10 of the electronic device 100. It is understood that the back cover 10 may cover the battery of the electronic device 100. Figure 1 (Not shown in the image) to protect the battery. However, as the requirements for thinner design of electronic devices 100 increase, the thickness of the back cover 10 is also gradually decreasing. This may result in the back cover 10 failing to provide effective protection for the battery, thereby greatly increasing the risk of battery puncture.

[0042] To reduce the risk of battery puncture Figure 2 A commonly used solution is provided, in which, Figure 2 It can be understood as Figure 1 A cross-sectional view (AA) of the electronic device shown. In, as... Figure 2In the illustrated electronic device, a puncture-resistant structure 30 may be provided between the battery 20 and the back cover 10. The puncture-resistant structure 30 can be fitted to the back cover 10 to protect the battery 20. However, the puncture-resistant structure 30 is typically a steel sheet or a layer of polymer material with a thickness of 0.1 mm to 0.15 mm, which undoubtedly has a significant impact on the overall thickness, weight, and battery capacity of the electronic device 100.

[0043] Another way to reduce the risk of battery puncture is to improve the material of the back cover 10 to enhance its structural strength. However, this would significantly increase the cost of the electronic device 100 and is only applicable to certain products, thus lacking universality.

[0044] Many current electronic devices (100) have wireless charging capabilities, which can be referenced further. Figure 2 In other words, the electronic device 100 can receive electrical energy through the electromagnetic induction principle of the charging coil module 40 and supply it to the battery 20, thereby powering the battery 20. (See also...) Figure 2 In this type of electronic device 100 with wireless charging function, the charging coil module 40 can be located between the back cover 10 and the battery 20. In view of this, the present invention provides a solution to reduce the risk of battery puncture by improving the puncture resistance of the charging coil module, effectively avoiding additional thickness of the electronic device, and without special requirements on the material of the back cover. To facilitate understanding of the solution provided by the present invention, a detailed description will be given below with reference to the accompanying drawings.

[0045] Reference Figure 3 , Figure 3 This is a schematic diagram of a stacked structure of a charging coil module provided in an embodiment of the present invention. The charging coil module 40 may include a charging coil 1 and a covering layer 2, wherein the covering layer 2 is used to cover the charging coil 1 to protect it. Furthermore, the puncture resistance of the covering layer 2 is greater than or equal to 0.5 N / µm, meaning that a 1µm thick covering layer 2 can withstand a force of 0.5 N. This effectively improves the structural strength of the entire charging coil module 40, thereby enhancing its puncture resistance, so that the charging coil module 40 can be applied to, for example... Figure 1 When the electronic device 100 shown is used, the charging coil module 40 can be used to protect the battery 20 of the electronic device 100, thereby reducing the risk of puncture of the battery 20 and improving the safety of the electronic device 100.

[0046] Figure 4 This is a schematic diagram of a charging coil provided in an embodiment of the present invention. Figure 4As shown, since the charging coil 1 is formed by winding multiple turns of coil 11, and in conventional designs, the thickness of coil 11 is typically 80μm to 160μm, a hollow region 12 is usually formed in the non-wire area of ​​the charging coil 1. It can be understood that the coil 11 is arranged around the hollow region 12. In some embodiments of this invention, the hollow region 12 can be a circular area, and the diameter d of the hollow region 12 can satisfy: 18mm ≤ d ≤ 22mm, for example, 18.5mm, 20mm, or 21mm. Therefore, the hollow region 12 may typically be a weak puncture-resistant area of ​​the charging coil module 40.

[0047] To improve the puncture resistance of this hollow region 12, refer to Figure 5 , Figure 5 for Figure 3 The diagram shows a BB cross-sectional view of the charging coil module. In this embodiment of the invention, the covering layer 2 may include a first part 21 and a second part 22 connected together, wherein the first part 21 covers the coil 11, and the second part 22 fills the hollow area 12. This effectively reduces the puncture-resistant weak areas of the charging coil module 40, thereby improving the overall puncture resistance of the charging coil module 40, and its thickness is not increased compared with the charging coil module of the prior art.

[0048] As described above, the charging coil 1 includes a multi-turn coil 11. In actual manufacturing, the charging coil 1 can be obtained by etching the copper layer. For example, refer to... Figure 6 , Figure 6 A flowchart illustrating the manufacturing process of a charging coil provided in this embodiment of the present invention can be used, for example, to demonstrate... Figure 4 The manufacturing process of the charging coil is shown. Then in Figure 6 In the embodiment shown, firstly, a double-sided copper-clad laminate including a substrate layer 13 and a copper layer 14 can be provided; secondly, the double-sided copper layer 14 can be etched with the required patterns by an etching process; then, the substrate layer 13 is drilled to form vias 15, and copper is formed in the vias by processes such as electroplating to connect the patterns formed by the double-sided copper layer 14, thereby forming the charging coil 1.

[0049] Depend on Figure 6 It can be seen that in the charging coil 1, there is a gap 16 between two adjacent coils 11, and the thickness of the gap 16 is less than the thickness of the area where the coils 11 of the charging coil 1 are located. In some embodiments of this utility model, in order to avoid the gap 16 becoming a weak area for puncture resistance of the charging coil module 40, the first part 21 of the covering layer 2 is also filled in the gap 16 to obtain the following effect: Figure 7The charging coil module 40 is shown. It is understood that in some embodiments of this invention, the thickness of the first portion 21 at the gap 16 is greater than the sum of the thicknesses of the first portion 21 covering the coil 11. This helps improve the puncture resistance at the gap 16 of the charging coil module 40, thereby reducing the puncture-resistant weak areas of the charging coil module 40.

[0050] Additionally, you can continue to refer to Figure 7 In some other embodiments of this utility model, the surface of the first part 21 of the entire charging coil module 40 is a flat surface. That is, in the charging coil module 40, the distance between the highest point and the lowest point of any surface of the first part 21 along the thickness direction is less than 20 μm. In this way, with a certain thickness of the charging coil module 40, the thickness of the first part 21 filling the gap 16 between any two turns of coil 11 can be maximized, thereby further improving the puncture resistance of the gap 16, which is beneficial to improving the overall puncture resistance of the charging coil module 40.

[0051] You can continue to refer to Figure 7 In this embodiment, the second portion 22 of the cover layer 2 fills the hollow region 12. It is understood that... Figure 6 The hollow region 12 of the charging coil 1 obtained by the processing flow shown can still include the substrate layer 13, which avoids the need to modify the processing technology of the charging coil 1, thereby helping to reduce the manufacturing cost of the charging coil module 40.

[0052] Refer to together Figure 6 and Figure 7 Since the covering layer 2 can cover the charging coil 1 from both sides during the formation of the covering layer 2, it can be understood that in some embodiments of this utility model, the thickness of the second part 22 is greater than the thickness of the first part 21 along the thickness direction of the charging coil module 40. This design improves the puncture resistance of the hollow area 12 of the charging coil module 40, thereby reducing the puncture-resistant weak areas of the charging coil module 40.

[0053] You can continue to refer to Figure 7 In some possible embodiments of this utility model, along the thickness direction of the charging coil module 40, the surfaces of the first portion 21 and the second portion 22 of the cover layer 2 located on the same side can also be coplanar. This can further improve the uniformity of the thickness of the charging coil module 40, and can maximize the thickness of the second portion 22 when the thickness of the charging coil module 40 is constant, thereby reducing the puncture-resistant weak areas of the charging coil module 40 and further improving the overall puncture resistance of the charging coil module 40.

[0054] The above Figure 6This is merely an exemplary demonstration of the processing method of the charging coil 1 of the charging coil module 40 provided by this utility model. In other embodiments of this utility model, the charging coil 1 can also be processed by other existing processing methods to reduce the cost of the charging coil module 40.

[0055] This embodiment of the invention does not limit the material of the covering layer 2. Exemplary examples may include at least one of the following ultra-high molecular weight polyethylene (UPE), polycarbonate (PC), thermoplastic polyurethane rubber (TPU), acrylonitrile butadiene styrene plastic (ABS), toughened polyoxymethylene (POM), polycarbonate-modified polyurethane dispersion (BUPET), polyphenylene ether, carbon fiber, and polyphenylene sulfide resin. The material is suitable as long as it can withstand significant puncture force.

[0056] In some embodiments of this utility model, the cover layer 2 can be pressed onto the charging coil 1 by medium temperature and medium pressure pressing method, so as to ensure the structural reliability of the cover layer 2 and the charging coil 1, thereby ensuring the structural reliability of the charging coil module 40.

[0057] It is understood that, in order to ensure that the covering layer 2 covers the charging coil 1, in some embodiments of this utility model, the two covering layers 2 can be pressed onto the charging coil 1 from opposite sides, thereby achieving the bonding of the two covering layers 2. Alternatively, in other embodiments, the charging coil 1 can be placed between the two covering layers 2, so that the bonding of the covering layer 2 and the charging coil 1, as well as the bonding of the two covering layers 2, can be achieved through a single pressing process.

[0058] In other embodiments of this utility model, pressure can also be transmitted to the cover layer 2 through a pressure transmission method, that is, through a medium, so as to achieve the pressing of the cover layer 2 and the charging coil 1 while ensuring the structural reliability of the cover layer 2, thereby further reducing the risk of damage to the cover layer 2.

[0059] It is worth mentioning that, since the charging coil 1 is a single network, the potentials of its different coils 11 are equal, and there is no voltage difference. Therefore, when the covering layer 2 is pressed onto the charging coil 1, the impact on the reliability of the charging coil 1 is small, thus ensuring the wireless charging performance of the charging coil module 40.

[0060] Figure 8aThis is a schematic diagram of another stacked structure of the charging coil module provided in an embodiment of the present invention. Figure 8a As shown, in some embodiments of this utility model, the charging coil module 40 may further include a nanocrystalline ribbon 3, which can be used to improve the magnetic permeability of the charging coil module 40, thereby improving the charging performance of the charging coil module 40.

[0061] You can continue to refer to Figure 8a The charging coil module 40 also includes two protective layers 4, which can be defined as the first protective layer 4a and the second protective layer 4b for ease of description. The nanocrystalline ribbon 3 is located between the first protective layer 4a and the second protective layer 4b, and both layers cover the nanocrystalline ribbon 3. This allows the two protective layers 4 to protect the nanocrystalline ribbon 3.

[0062] Additionally, the first protective layer 4a and the covering layer 2 can be connected by double-sided adhesive ( Figure 8a (Not shown in the image) are bonded together as a whole to improve the structural reliability of the charging coil module 40.

[0063] In some embodiments of this invention, at least one of the first protective layer 4a and the second protective layer 4b has a puncture resistance greater than or equal to 0.5 N / µm, indicating that the protective layer 4 has strong puncture resistance. Furthermore, since the protective layer 4 is stacked with the aforementioned covering layer 2, it can further enhance the puncture resistance of the charging coil module 40, thereby further reducing the puncture risk of the battery 20 of the electronic device 100 using the charging coil module 40, and thus improving the safety of the electronic device 100.

[0064] In this embodiment of the invention, the protective layer 4 is made of at least one of the following ultra-high molecular weight materials: ultra-high molecular weight polyethylene, polycarbonate, thermoplastic polyurethane rubber, acrylonitrile-butadiene-styrene plastic, toughened polyoxymethylene, polycarbonate-modified polyurethane dispersion, polyphenylene ether, carbon fiber, and polyphenylene sulfide resin. Furthermore, the material of the protective layer 4 can be the same as or different from that of the cover layer 2; this invention does not limit its application.

[0065] As can be understood from the above description of the protective layer 4, due to its high structural strength, even if the protective layer 4 is bonded to the cover layer 2 before processing the nanocrystalline ribbon 3, it will not have a significant impact on the protective layer 4. In other words, in this embodiment of the invention, using the aforementioned protective layer 4 to encapsulate and protect the nanocrystalline ribbon 3 does not require additional or modified processes, thus achieving both protection of the nanocrystalline ribbon 3 and enhancing the puncture resistance of the charging coil module 40.

[0066] In this embodiment of the invention, the layers of the charging coil module 40 can be connected not only by adhesive bonding but also by hot pressing. Since both the protective layer 4 and the covering layer 2 are made of ultra-high molecular weight polymer (UHMWPP) material, they can fuse together into a single structure under heat and pressure. Therefore, it can be referred to... Figure 8b , Figure 8b This is a schematic diagram of another stacked structure of the charging coil module provided in an embodiment of the present invention. (Compared to the above...) Figure 8a The difference between the charging coil module 40 shown is that, in Figure 8b In the illustrated embodiment, the nanocrystalline ribbon 3 is spaced apart from the charging coil 1 along the thickness direction of the charging coil module 40, and the nanocrystalline ribbon 3 is connected to the cover layer 2. The connection between the nanocrystalline ribbon 3 and the cover layer 2 can be understood as being achieved through a hot-pressing process. Additionally, a protective layer 4 covers the side of the nanocrystalline ribbon 3 facing away from the cover layer 2. In this solution, the cover layer 2 and the protective layer 4 can be used to protect the nanocrystalline ribbon, and the charging coil module 40 provided by this solution also has high structural reliability and puncture resistance.

[0067] In the charging coil module 40 described above, the charging coil 1 is wrapped with a covering layer 2 to improve the puncture resistance of the charging coil module 40. In some embodiments of this utility model, the charging coil 1 can also be embedded in a substrate with high puncture resistance to improve the overall puncture resistance of the charging coil module 40.

[0068] For example, you can refer to Figure 9 , Figure 9 This is another structural schematic diagram of the charging coil module provided in an embodiment of the present invention. In this embodiment, the charging coil module 40 may include a substrate 5 and a charging coil 1, wherein the charging coil 1 is embedded in the substrate 5 so that the substrate 5 can protect the charging coil 1.

[0069] In some embodiments of this invention, the puncture resistance of the substrate 5 is greater than or equal to 0.5 N / µm, meaning that a 1µm thick substrate 5 can withstand a force of 0.5 N. However, in practical applications, to meet the structural reliability requirements of the charging coil module 40, the thickness h of the substrate 5 can satisfy: 15µm ≤ h ≤ 500µm. Therefore, the charging coil module 40 has high puncture resistance, making it suitable for applications such as... Figure 1 When the electronic device 100 shown is used, the charging coil module 40 can effectively protect the battery of the electronic device 100, thereby reducing the risk of battery puncture and improving the safety of the electronic device 100.

[0070] Furthermore, the material of the substrate 5 may include at least one of the following ultra-high molecular weight materials: ultra-high molecular weight polyethylene, polycarbonate, thermoplastic polyurethane rubber, acrylonitrile-butadiene-styrene plastic, toughened polyoxymethylene, polycarbonate-modified polyurethane dispersion, polyphenylene ether, carbon fiber, and polyphenylene sulfide resin. This utility model does not specifically limit its composition.

[0071] To embed the charging coil 1 into the substrate 5, refer to Figure 10 , Figure 10 This is a flowchart illustrating the processing of a charging coil module provided in an embodiment of the present invention. First, multiple groove patterns 51 can be etched on the substrate 5 using processes such as laser scanning; then, conductive metals such as copper or silver paste are electroplated or filled into the grooves 51 to form a charging coil 1 pattern, that is, the multiple turns of the charging coil 1 are arranged one-to-one in the multiple grooves 51, thereby making the charging coil 1 and the substrate 5 a whole.

[0072] Understandably, since the charging coil 1 is directly formed on the substrate 5, the interface between the charging coil 1 and the substrate 5 is well bonded, ensuring the structural reliability and charging performance of the charging coil module 40. Furthermore, because the space between adjacent turns 11 and the hollow area 12 of the charging coil 1 are filled with the material of the substrate 5, meaning the substrate 5 encloses the charging coil 1, the overall thickness of the charging coil module 40 is relatively uniform. This not only effectively improves the structural strength of the charging coil module 40 but also prevents weak areas from forming, thus ensuring the overall puncture resistance of the charging coil module 40.

[0073] exist Figure 9 In the illustrated embodiment, the charging coil 1 in the charging coil module 40 has a single-layer structure. However, in other embodiments of this invention, for example... Figure 11 In the illustrated embodiment, along the thickness direction of the substrate, the charging coil 1 includes a first group of coils 1a and a second group of coils 1b stacked and spaced apart. It is understood that the first group of coils 1a and the second group of coils 1b are separated by the material of the substrate 5 to avoid short circuits between the two groups of coils.

[0074] like Figure 11 As shown, the first set of coils 1a and the second set of coils 1b are exposed on two opposite surfaces of the substrate 5. Both the first set of coils 1a and the second set of coils 1b can be processed according to the above description of the processing flow of the charging coil 1. In addition, the substrate 5 also includes vias 15, through which the first set of coils 1a and the second set of coils 1b are connected to form a complete wiring of the charging coil 1.

[0075] As described above regarding charging coil 1, its material is a highly conductive metal such as copper or silver paste, but its chemical stability is poor. Therefore, in some embodiments of this invention, for example in... Figure 9 or Figure 11 In the illustrated embodiment, although the surface of the charging coil 1 is exposed to the surface of the substrate 5, the surface of the charging coil 1 includes an anti-oxidation layer. Figure 9 or Figure 11 (not shown in the figure) This design ensures the chemical stability of the charging coil 1 while effectively avoiding an additional increase in the thickness of the charging coil module 40, thereby facilitating the thinner design of electronic devices using the charging coil module 40.

[0076] This invention does not limit the method of anti-oxidation treatment for the charging coil 1. For example, in some embodiments of this invention, an anti-oxidation layer can be formed on the surface of the charging coil 1 by surface treatment processes such as coating an organic solderability preservative (OSP) or electroless nickel / immersion gold (ENIG) electroplating anti-oxidation layer.

[0077] In other embodiments of this utility model, see below. Figure 12 The charging coil module 40 shown has a base 5 that completely encloses the charging coil 1, meaning that the charging coil 1 has no exposed surface. This allows the base 5 to protect the charging coil 1 from oxidation. Furthermore, as described above, completely enclosing the charging coil 1 with the base 5 increases the thickness of the base 5, thereby improving the overall puncture resistance of the charging coil module 40.

[0078] It is worth mentioning that, in some embodiments of this utility model, the specific implementation of the substrate 5 wrapping the charging coil 1 can be understood as follows: Figure 11 The structure shown is further reinforced with a base material on both sides, and the specific bonding method can be referred to the above embodiment. In this embodiment of the utility model, for ease of distinction, it can be... Figure 11 The substrate 5 shown is defined as the first substrate layer 52, and refers to Figure 12 The two layer structures respectively pressed onto both sides of the first base layer 52 are defined as the second base layer 53 and the third base layer 54. Since the second base layer 53 and the third base layer 54 can form a whole after being pressed onto the first base layer 52 to completely wrap the charging coil 1, in some embodiments of this utility model, the base 5 can be understood as a structure formed by pressing together multiple layers.

[0079] In some embodiments of this invention, the puncture resistance of the second base layer 53 and the third base layer 54 is greater than or equal to 0.5 N / µm. This eliminates the need for surface anti-oxidation treatment of the charging coil 1 and effectively improves the overall puncture resistance of the charging coil module 40.

[0080] In order to reduce the impact of the second base layer 53 and the third base layer 54 on the overall thickness of the charging coil module 40, in some embodiments of the present invention, the thickness of the second base layer 53 can be selected between 10 μm and 50 μm, and the thickness of the third base layer 54 can also be selected between 10 μm and 50 μm.

[0081] In this invention, the materials of the second base layer 53 and the third base layer 54 may also include at least one of the following ultra-high molecular weight materials: ultra-high molecular weight polyethylene, polycarbonate, thermoplastic polyurethane rubber, acrylonitrile-butadiene-styrene plastic, toughened polyoxymethylene, polycarbonate-modified polyurethane dispersion, polyphenylene ether, carbon fiber, and polyphenylene sulfide resin.

[0082] In some embodiments of this invention, the second base layer 53 and the third base layer 54 may be made of the same material as the first base layer 52. This effectively improves the bonding reliability between the second base layer 53 and the third base layer 54 and the first base layer 52, thereby enhancing the structural reliability of the charging coil module 40. In other embodiments of this invention, the second base layer 53 and the third base layer 54 may be made of a different material than the first base layer 52, thereby increasing the design flexibility of the charging coil module 40.

[0083] In this embodiment of the utility model, Figures 9 to 12 Other structures of the charging coil module 40 shown can be configured with reference to any of the above embodiments, and will not be described in detail here.

[0084] The above Figure 9 The illustrated embodiment demonstrates a configuration where the charging coil of the charging coil module 40 has a single-layer structure. Figure 11 and Figure 12 The illustrated embodiment demonstrates a double-layer structure for the charging coil 1 of the charging coil module 40. Based on this, the charging coil 1 of the charging coil module 40 can also be configured with a three-layer or higher structure according to actual design needs, which can... Figure 9 and Figure 11 and Figure 12 The embodiments shown are combined, but will not be described in detail here.

[0085] The above embodiments are merely illustrative examples of some possible solutions provided by this utility model for improving the puncture resistance of the charging coil module 40. Based on similar design principles, in other embodiments of this utility model, a series of adaptive adjustments can be made to the specific structure of the charging coil module 40. These adjustments will not be listed here, but they should all be understood to fall within the protection scope of this utility model.

[0086] When applying the charging coil module 40 provided by this utility model to the electronic device 100, it can be referred to Figure 13 , Figure 13 This is a cross-sectional view of an electronic device 100 provided in an embodiment of the present invention. The charging coil module 40 is located between the back cover 10 and the battery 20. In the electronic device 100 provided by the present invention, because the charging coil module 40 has high puncture resistance, it can be used to protect the battery 20, thereby reducing the risk of puncture to the battery 20 and improving the safety of the electronic device 100. Additionally, with... Figure 2 Compared to the electronic devices shown, since the electronic device 100 provided by this utility model does not require an additional anti-puncture structure 30, it is beneficial to achieve a thinner design for the electronic device 100.

[0087] You can continue to refer to Figure 13 In some embodiments of this invention, the charging coil module 40 can completely cover the battery 20. This increases the protection range of the charging coil module 40 for the battery 20, thereby further reducing the risk of puncture to the battery 20.

[0088] It is worth mentioning that, in the various embodiments of this utility model, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0089] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A charging coil module (40), characterized in that, The charging coil module (40) includes a charging coil (1) and a covering layer (2), wherein: The charging coil (1) includes a coil (11) and a hollow region (12), the coil (11) being arranged around the hollow region (12); The puncture resistance of the covering layer (2) is greater than or equal to 0.5 N / μm. The covering layer (2) includes a first part (21) and a second part (22) connected to each other. The first part (21) covers the coil (11), and the second part (22) fills the hollow area (12).

2. The charging coil module (40) as described in claim 1, characterized in that, The charging coil (1) includes a multi-turn coil (11), with a gap (16) between two adjacent turns of the coil (11), and the thickness of the first portion (21) at the gap (16) is greater than the sum of the thicknesses of the first portion (21) covering the coil (11).

3. The charging coil module (40) as described in claim 2, characterized in that, The surface of the first part (21) is a flat surface.

4. The charging coil module (40) as described in any one of claims 1 to 3, characterized in that, Along the thickness direction of the charging coil module (40), the thickness of the second part (22) is greater than the thickness of the first part (21).

5. The charging coil module (40) as described in claim 4, characterized in that, The surfaces of the first part (21) and the second part (22) are coplanar on the same side.

6. The charging coil module (40) as described in any one of claims 1 to 3, characterized in that, The charging coil module (40) further includes a nanocrystalline ribbon (3) and a protective layer (4); along the thickness direction of the charging coil module (40), the nanocrystalline ribbon (3) is spaced apart from the charging coil (1), the nanocrystalline ribbon (3) is connected to the cover layer (2), and the protective layer (4) covers the side of the nanocrystalline ribbon (3) away from the cover layer (2).

7. The charging coil module (40) as described in any one of claims 1 to 3, characterized in that, The charging coil module (40) further includes a nanocrystalline ribbon (3) and two protective layers (4). The two protective layers (4) include a first protective layer (4a) and a second protective layer (4b). The nanocrystalline ribbon (3) is located between the first protective layer (4a) and the second protective layer (4b), and the first protective layer (4a) and the second protective layer (4b) cover the nanocrystalline ribbon (3). At least one of the first protective layer (4a) and the second protective layer (4b) has a puncture resistance greater than or equal to 0.5 N / μm. The first protective layer (4a) is bonded to the cover layer (2).

8. The charging coil module (40) as described in claim 6, characterized in that, The material of the protective layer (4) includes one of ultra-high molecular weight polyethylene, polycarbonate, thermoplastic polyurethane rubber, polyoxymethylene, polycarbonate modified polyurethane dispersion, polyphenylene ether, carbon fiber or polyphenylene sulfide resin.

9. The charging coil module (40) as described in claim 7, characterized in that, The material of the protective layer (4) includes one of ultra-high molecular weight polyethylene, polycarbonate, thermoplastic polyurethane rubber, polyoxymethylene, polycarbonate modified polyurethane dispersion, polyphenylene ether, carbon fiber or polyphenylene sulfide resin.

10. The charging coil module (40) as described in any one of claims 1 to 3, characterized in that, The material of the covering layer (2) includes one of ultra-high molecular weight polyethylene, polycarbonate, thermoplastic polyurethane rubber, polyoxymethylene, polycarbonate modified polyurethane dispersion, polyphenylene ether, carbon fiber or polyphenylene sulfide resin.

11. A charging coil module (40), characterized in that, The charging coil module (40) includes a base (5) and a charging coil (1), wherein: The substrate (5) includes a plurality of trenches (51); The charging coil (1) includes a multi-turn coil (11), and the multi-turn coil (11) is disposed in the plurality of grooves (51) in a one-to-one correspondence; The puncture resistance of the substrate (5) is greater than or equal to 0.5 N / μm.

12. The charging coil module (40) as described in claim 11, characterized in that, Along the thickness direction of the substrate (5), the charging coil (1) includes a first group of coils (1a) and a second group of coils (1b) stacked and spaced apart. The substrate (5) also includes a via (15), through which the first group of coils (1a) and the second group of coils (1b) are connected.

13. The charging coil module (40) as described in claim 11 or 12, characterized in that, The substrate (5) completely encloses the charging coil (1).

14. The charging coil module (40) as described in claim 11 or 12, characterized in that, The surface of the charging coil (1) is exposed on the surface of the substrate (5), and the surface of the charging coil (1) includes an anti-oxidation layer.

15. The charging coil module (40) as described in claim 11 or 12, characterized in that, The substrate (5) is made of one of the following materials: ultra-high molecular weight polyethylene, polycarbonate, thermoplastic polyurethane rubber, polyoxymethylene, polycarbonate-modified polyurethane dispersion, polyphenylene ether, carbon fiber or polyphenylene sulfide resin.

16. An electronic device (100), characterized in that, It includes a battery (20), a back cover (10), and a charging coil module (40) as described in any one of claims 1 to 15, wherein the charging coil module (40) is located between the battery (20) and the back cover (10).

17. The electronic device (100) as claimed in claim 16, characterized in that, The charging coil module (40) completely covers the battery (20).

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