Wireless charging coil assembly, charging module and electronic device

Abstract

The application discloses a wireless charging coil, a charging module and an electronic device, and belongs to the technical field of electronics. The wireless charging coil assembly comprises a substrate and a coil on the substrate. The coil comprises a body part and a first connecting part, the first connecting part is connected with an inner ring end part of the body part and extends towards the outside of the coil, the body part has an overlapping section and a non-overlapping section, and a part of the first connecting part on the substrate is located in the projection of the overlapping section on the substrate and does not coincide with the projection of the non-overlapping section on the substrate. The thickness of the first connecting part and the thickness of the overlapping section are both smaller than the thickness of the non-overlapping section, and the substrate and the coil are both depressed in the direction of the first connecting part pointing to the substrate. The technical scheme of the application can make the wireless charging coil assembly as a whole relatively thin.

Description

Technical Field

[0001] This application relates to the field of electronic technology, specifically to a wireless charging coil assembly, a charging module, and an electronic device. Background Technology

[0002] Wireless charging technology is a charging method that allows energy transfer between a power supply device and a charging device without a physical connection. It primarily relies on principles such as electromagnetic induction, electromagnetic resonance, or radio waves. Due to its high convenience, wireless charging is widely used in mobile phones, tablets, smart wearables, smart homes, automobiles, and many other fields. To achieve effective circuit connection, improve energy transfer efficiency, and ensure charging safety, the inner coil of the wireless charging coil is typically led out from the inside to the outside for electrical connection with the power supply or other control circuits.

[0003] In related technologies, the lead-out position of the wireless charging coil at the inner end is relatively thick, which results in a relatively thick overall wireless charging coil and occupies a large stacking space, which is not conducive to the realization of thinner and lighter electronic devices equipped with the wireless charging coil. Utility Model Content

[0004] In view of this, this application provides a wireless charging coil assembly, a charging module, and an electronic device, which can make the wireless charging coil assembly thinner and lighter overall, which is conducive to realizing the thinning and lightening of the wireless charging coil assembly.

[0005] On one hand, embodiments of this application provide a wireless charging coil assembly, the wireless charging coil assembly including a substrate and a coil located on the substrate;

[0006] The coil includes a body portion and a first connecting portion. The first connecting portion is connected to the inner end of the body portion and extends outward from the coil. The body portion has overlapping and non-overlapping sections. The orthographic projection of the portion of the first connecting portion on the substrate is located within the orthographic projection of the overlapping section on the substrate and does not coincide with the orthographic projection of the non-overlapping section on the substrate.

[0007] The thickness of the first connecting portion and the thickness of the overlapping section are both less than the thickness of the non-overlapping section, and the substrate and the coil are both compressed and recessed along the direction from the first connecting portion to the substrate.

[0008] In the charging coil assembly provided in this application embodiment, the first connecting portion of the coil is connected to the inner end of the main body and extends outward from the coil, thereby facilitating the electrical connection between the coil and the power supply device. The main body has overlapping and non-overlapping sections. The orthographic projection of the portion of the first connecting portion on the substrate lies within the orthographic projection of the overlapping section on the substrate and does not coincide with the orthographic projection of the non-overlapping section on the substrate. Since the thickness of the first connecting portion and the thickness of the overlapping section are both smaller than the thickness of the non-overlapping section, and both the substrate and the coil are recessed along the direction of the first connecting portion pointing towards the substrate, the overall thickness of the wireless charging coil assembly at the overlapping section location can be reduced and tends to be similar to the overall thickness at the non-overlapping section location. In other words, the wireless charging coil assembly provided in this application embodiment can both utilize the first connecting portion to electrically connect the coil to the external power supply device and reduce the overall thickness of the wireless charging coil assembly, thereby reducing the stacking space occupied by the wireless charging coil assembly and facilitating the thinning and lightening of the assembly.

[0009] In some possible implementations, the substrate includes a first bearing surface and a second bearing surface that are opposite to each other;

[0010] The main body is located on the first bearing surface;

[0011] The first connecting part is located on the second bearing surface.

[0012] By adopting the technical solution of this application, since the main body and the first connecting part are located on the bearing surfaces on both sides of the substrate, mutual interference between the main body and the first connecting part can be avoided.

[0013] In some possible implementations, in the thickness direction, the side of the overlapping segment away from the substrate does not extend beyond the side of the non-overlapping segment away from the substrate, and the side of the first connecting portion away from the substrate does not extend beyond the outer edge of the second bearing surface.

[0014] By adopting the technical solution of this application, it can be ensured that after the coil and substrate are pressed and indented, the thickness range occupied by the overlapping section to the first connection part does not exceed the thickness range occupied by the non-overlapping section and the substrate. This avoids increasing the overall thickness of the wireless charging coil assembly due to the provision of the first connection part, thereby reducing the stacking space occupied by the wireless charging coil assembly and facilitating the thinning of the wireless charging coil assembly.

[0015] In some possible implementations, the body portion is spiral-shaped, and the size of the overlapping segment is larger than the size of the first connecting portion in the width direction of the first connecting portion.

[0016] By adopting the technical solution of this application, it can be ensured that the two sides of the first connecting part will not exceed the two sides of the overlapping section in the width direction of the first connecting part, thereby avoiding the first connecting part from overlapping with the overlapping section in the thickness direction and thus increasing the overall thickness of the wireless charging coil assembly, which is more conducive to the wireless charging coil assembly to achieve thinness.

[0017] In some possible implementations, the cross-sectional width of the overlapping segment is greater than the cross-sectional width of the non-overlapping segment.

[0018] By adopting the technical solution of this application, by increasing the cross-sectional width of the overlapping section, the impedance loss caused by reducing the thickness of the overlapping section can be compensated, so as to ensure that the overlapping section still has a high current carrying capacity, thereby ensuring that the coil has a high current carrying capacity.

[0019] In some possible implementations, the thickness of the non-overlapping segment gradually decreases from the inner circle to the outer circle.

[0020] By adopting the technical solution of this application, after the coil and the substrate are pressed and indented, it is ensured that the part of the non-overlapping section near the overlapping section occupies only a small thickness space, thereby further reducing the overall thickness of the wireless charging coil assembly, which is conducive to achieving thinness and lightness.

[0021] In some possible implementations, the cross-sectional width of the first connecting portion is greater than the cross-sectional width of the inner ring end of the body portion.

[0022] By adopting the technical solution of this application, the impedance loss caused by reducing the thickness of the first connection part can be compensated, so as to ensure that the first connection part still has a high current carrying capacity, thereby ensuring that the coil has a high current carrying capacity.

[0023] In some possible implementations, the coil further includes a second connecting portion located on the first bearing surface, the second connecting portion being connected to the outer end of the body portion.

[0024] By adopting the technical solution of this application, by electrically connecting the second connecting part connected to the outer ring end of the main body and the first connecting part connected to the inner ring end of the main body to the power supply device respectively, an effective circuit connection can be achieved and the energy transmission efficiency can be improved.

[0025] On the other hand, this application also provides a charging module, which includes the wireless charging coil assembly described in any one of the above embodiments of this application.

[0026] On the other hand, this application also provides an electronic device, which includes the wireless charging coil assembly described in any one of the above embodiments of this application. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a top view schematic diagram of a wireless charging coil assembly provided in an embodiment of this application;

[0029] Figure 2 This is a top view of a coil in a wireless charging coil assembly provided in an embodiment of this application;

[0030] Figure 3 yes Figure 1 The figure shown is a cross-sectional view of a wireless charging coil assembly provided in this application embodiment at section B1-B1;

[0031] Figure 4 yes Figure 1 The figure shown is a cross-sectional view of a wireless charging coil assembly at section B1-B1 and a partially enlarged view thereof, according to an embodiment of this application.

[0032] Figure 5 yes Figure 1 The figure shown is a cross-sectional view of a wireless charging coil assembly before hot pressing, provided in an embodiment of this application, at section B1-B1.

[0033] Figure 6 yes Figure 2 The diagram shown is a cross-sectional view of the coil in a wireless charging coil assembly provided in this application embodiment at section A1-A1.

[0034] Figure label:

[0035] 1. Substrate; 101. First bearing surface; 102. Second bearing surface;

[0036] 2. Coil;

[0037] 100. Main body; 110. Overlapping section; 120. Non-overlapping section; 200. First connecting part;

[0038] 300. Second connecting part;

[0039] Z, thickness direction;

[0040] X, the width direction of the first connecting part.

[0041] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by those skilled in the art.

[0044] To make the technical solutions and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0045] Combination Figure 1 , Figure 2 and Figure 3 As shown, this application embodiment provides a wireless charging coil assembly, which includes a substrate 1 and a coil 2 located on the substrate 1. It should be noted that in this embodiment, the coil 2 can be made of copper foil, and the coil 2 can be obtained through an etching process. The substrate 1 is made of materials such as PP (Polypropylene) and / or nanocrystalline materials, and the substrate 1 is used to support the coil 2.

[0046] The coil 2 includes a body portion 100 and a first connecting portion 200. The first connecting portion 200 is connected to the inner end of the body portion 100 and extends outward from the coil 2. The body portion 100 has an overlapping section 110 and a non-overlapping section 120. The orthographic projection of the portion of the first connecting portion 200 on the substrate 1 lies within the orthographic projection of the overlapping section 110 on the substrate 1 and does not coincide with the orthographic projection of the non-overlapping section 120 on the substrate 1. The thickness of the first connecting portion 200 and the thickness of the overlapping section 110 are both less than the thickness of the non-overlapping section 120. Both the substrate 1 and the coil 2 are pressed and recessed along the direction from the first connecting portion 200 towards the substrate 1. It should be noted that after the coil 2 is mounted on the substrate 1, a hot press can be pressed against the side of the first connecting portion 200 away from the substrate 1, and pressure can be applied to the side of the hot press towards the substrate 1 to perform hot pressing shaping of the wireless charging coil assembly, causing the substrate 1 and the coil 2 to be pressed and recessed. Figure 5 The image shows the wireless charging coil assembly before hot pressing. Figure 3 The image shows the final shape of the wireless charging coil assembly after hot pressing. The pressing surface between the hot press and the wireless charging coil assembly can be a convex surface that protrudes towards the wireless charging coil assembly.

[0047] In the charging coil assembly provided in this application embodiment, the first connecting portion 200 of the coil 2 is connected to the inner end of the body portion 100 and extends outward from the coil 2, thereby facilitating the electrical connection between the coil 2 and the power supply device. The body portion 100 has an overlapping section 110 and a non-overlapping section 120. The orthographic projection of the portion of the first connecting portion 200 located on the substrate 1 lies within the orthographic projection of the overlapping section 110 on the substrate 1 and does not coincide with the orthographic projection of the non-overlapping section 120 on the substrate 1. Since the thickness of the first connecting portion 200 and the thickness of the overlapping section 110 are both smaller than the thickness of the non-overlapping section 120, and both the substrate 1 and the coil 2 are recessed along the direction from the first connecting portion 200 to the substrate 1, the overall thickness of the wireless charging coil assembly at the location of the overlapping section 110 can be reduced and tends to be similar to the overall thickness at the location of the non-overlapping section 120. In other words, the wireless charging coil assembly provided in this application embodiment can both make the coil 2 electrically connected to the external power supply device through the first connecting part 200 and reduce the overall thickness of the wireless charging coil assembly, thereby reducing the stacking space occupied by the wireless charging coil assembly, which is conducive to achieving a thinner and lighter device equipped with the wireless charging coil assembly.

[0048] The following is in conjunction with the appendix Figures 1 to 6 The details and functions of the wireless charging coil assembly provided in the embodiments of this application will be described in more detail.

[0049] like Figure 3 As shown, in some possible embodiments, the substrate 1 includes a first bearing surface 101 and a second bearing surface 102 facing away from each other. The body portion 100 is located on the first bearing surface 101. The first connecting portion 200 is located on the second bearing surface 102. It should be noted that since the body portion 100 and the first connecting portion 200 are located on the bearing surfaces on opposite sides of the substrate 1, mutual interference between the body portion 100 and the first connecting portion 200 can be avoided. This also facilitates the etching of the copper foil to form the coil 2.

[0050] like Figure 3 As shown, in some possible embodiments, in the thickness direction Z, the side of the overlapping segment 110 facing away from the substrate 1 does not extend beyond the side of the non-overlapping segment 120 facing away from the substrate 1, and the side of the first connecting portion 200 facing away from the substrate 1 does not extend beyond the outer edge of the second bearing surface 102. It should be understood that the wireless charging coil assembly as a whole is curved outwards towards the side where the first connecting portion 200 is located, and recessed inwards along the direction from the first connecting portion 200 towards the substrate 1. (Combined with...) Figure 3As shown, the side of the overlapping section 110 facing away from the substrate 1 not exceeding the side of the non-overlapping section 120 facing away from the substrate 1 refers to the horizontal plane where the top surface of the overlapping section 110 does not exceed the side of the non-overlapping section 120 facing away from the substrate 1 (i.e., the position indicated by the dashed line A in the figure). The side of the first connecting portion 200 facing away from the substrate 1 not exceeding the outer edge of the second bearing surface 102 refers to the horizontal plane where the first connecting portion 200 does not exceed the horizontal plane where the relative positions of the outer edges of the two sides of the second bearing surface 102 are connected (i.e., the position indicated by the dashed line B in the figure). This arrangement ensures that after the coil 2 and the substrate 1 are compressed and indented, the thickness range occupied by the overlapping section 110 to the first connecting portion 200 does not exceed the thickness range occupied by the non-overlapping section 120 and the substrate 1. This avoids additionally increasing the overall thickness of the wireless charging coil assembly due to the provision of the first connecting portion 200, thereby reducing the stacking space occupied by the wireless charging coil assembly and facilitating the thinning of the wireless charging coil assembly.

[0051] Combination Figure 2 and Figure 4 As shown, in some possible embodiments, the main body 100 is spiral-shaped, and in the width direction X of the first connecting portion 200, the dimension d1 of the overlapping segment 110 is larger than the dimension d2 of the first connecting portion 200. It should be noted that this ensures that in the width direction X of the first connecting portion 200, the two sides of the first connecting portion 200 do not extend beyond the two sides of the overlapping segment 110, thereby avoiding additional increase in the overall thickness of the wireless charging coil assembly due to the overlap between the first connecting portion 200 and the overlapping segment 110 in the thickness direction Z, thus further facilitating the thinning and lightening of the wireless charging coil assembly.

[0052] Combination Figure 2 and Figure 6 As shown, in some possible embodiments, the cross-sectional width d4 of the overlapping section 110 is greater than the cross-sectional width d3 of the non-overlapping section 120. It should be noted that by increasing the cross-sectional width of the overlapping section 110, the impedance loss caused by reducing the thickness of the overlapping section 110 can be compensated, so as to ensure that the overlapping section 110 still has a high current carrying capacity, thereby ensuring that the coil 2 has a high current carrying capacity.

[0053] like Figure 3 As shown, in some possible embodiments, the thickness of the non-overlapping segment 120 gradually decreases from the inner ring to the outer ring. It should be noted that after the coil 2 and the substrate 1 are pressed and recessed, it is ensured that the portion of the non-overlapping segment 120 near the overlapping segment 110 occupies only a small thickness space, thereby further reducing the overall thickness of the wireless charging coil assembly, which is beneficial for achieving a thinner and lighter design.

[0054] like Figure 2As shown, in some possible embodiments, the cross-sectional width d5 ​​of the first connecting portion 200 is greater than the cross-sectional width d6 of the inner ring end of the body portion 100. It should be noted that this can compensate for the impedance loss caused by reducing the thickness of the first connecting portion 200, so as to ensure that the first connecting portion 200 still has a high current carrying capacity, thereby ensuring that the coil 2 has a high current carrying capacity.

[0055] Combination Figure 1 and Figure 2 As shown, in some possible embodiments, the coil 2 further includes a second connecting portion 300 located on the first bearing surface 101, the second connecting portion 300 being connected to the outer end of the body portion 100. It should be noted that by electrically connecting the second connecting portion 300 connected to the outer end of the body portion 100 and the first connecting portion 200 connected to the inner end of the body portion 100 to the power supply device, effective circuit connection and improved energy transmission efficiency can be achieved.

[0056] On the other hand, this application also provides a charging module, which includes the wireless charging coil assembly described in any one of the embodiments of this application. It should be noted that the charging module provided in this application also includes components such as a circuit board for implementing the wireless charging function, for example, an FPC (Flexible Printed Circuit) wireless charging module. Since the wireless charging coil assembly is relatively thin and light, the charging module can also be thinner and lighter, reducing the stacking space occupied by the charging module, thereby facilitating the thinning and lightening of electronic devices equipped with the charging module.

[0057] On the other hand, this application also provides an electronic device, which includes the wireless charging coil assembly described in any one of the embodiments of this application. It should be noted that the electronic device provided in this application can be, for example, a mobile phone, tablet computer, smart wearable device, smart home device, automobile, or other device with wireless charging functionality. Because the wireless charging coil assembly is relatively thin and light, it reduces the stacking space occupied within the electronic device, thereby contributing to the thinner and lighter design of the electronic device.

[0058] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0059] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A wireless charging coil assembly, characterized in that, The wireless charging coil assembly includes a substrate (1) and a coil (2) located on the substrate (1); The coil (2) includes a body portion (100) and a first connecting portion (200). The first connecting portion (200) is connected to the inner end of the body portion (100) and extends outward from the coil (2). The body portion (100) has an overlapping section (110) and a non-overlapping section (120). The orthographic projection of the portion of the first connecting portion (200) on the substrate (1) is located within the orthographic projection of the overlapping section (110) on the substrate (1) and does not coincide with the orthographic projection of the non-overlapping section (120) on the substrate (1). The thickness of the first connecting portion (200) and the thickness of the overlapping segment (110) are both less than the thickness of the non-overlapping segment (120). The substrate (1) and the coil (2) are both pressed and recessed in the direction from the first connecting portion (200) to the substrate (1).

2. The wireless charging coil assembly according to claim 1, characterized in that, The substrate (1) includes a first bearing surface (101) and a second bearing surface (102) facing away from each other; The main body (100) is located on the first bearing surface (101); The first connecting part (200) is located on the second bearing surface (102).

3. The wireless charging coil assembly according to claim 2, characterized in that, In the thickness direction, the side of the overlapping section (110) away from the substrate (1) does not extend beyond the side of the non-overlapping section (120) away from the substrate (1), and the side of the first connecting portion (200) away from the substrate (1) does not extend beyond the outer edge of the second bearing surface (102).

4. The wireless charging coil assembly according to claim 2, characterized in that, The main body (100) is spiral-shaped, and in the width direction of the first connecting part (200), the size of the overlapping section (110) is larger than the size of the first connecting part (200).

5. The wireless charging coil assembly according to claim 4, characterized in that, The cross-sectional width of the overlapping segment (110) is greater than the cross-sectional width of the non-overlapping segment (120).

6. The wireless charging coil assembly according to claim 2, characterized in that, The thickness of the non-overlapping segment (120) gradually decreases from the inner circle to the outer circle.

7. The wireless charging coil assembly according to claim 1, characterized in that, The cross-sectional width of the first connecting portion (200) is greater than the cross-sectional width of the inner ring end of the body portion (100).

8. The wireless charging coil assembly according to claim 2, characterized in that, The coil (2) also includes a second connecting portion (300) located on the first bearing surface (101), and the second connecting portion (300) is connected to the outer end of the body portion (100).

9. A charging module, characterized in that, The charging module includes a wireless charging coil assembly as described in any one of claims 1 to 8.

10. An electronic device, characterized in that, The electronic device includes a wireless charging coil assembly as claimed in any one of claims 1 to 8.

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