A circular winding wireless charging coil

Abstract

The present invention provides a circular winding wireless charging coil, which reduces the overall thickness of the entire coil, and has a simple structure and low manufacturing cost. It includes a coil carrier with an inner groove for placing the coil, the center of the inner groove is provided with a center hole, the wound single-layer winding coil is attached to the first surface of the release film, the second surface of the release film and the winding coil are pressed and arranged in the inner groove, the inner circle of the single-layer coil is provided with an inwardly convex first inner contact wire, the outer circle of the winding coil is provided with an outwardly convex second outer contact wire, the first inner contact wire and the second outer contact wire are extended and arranged at the inner and outer ends of the same diameter, the first inner contact wire is provided with a first welding contact point structure in the inner area relative to the center hole, the outer edge area of ​​the coil carrier relative to the second outer contact wire is provided with an avoidance gap, and the area of ​​the second outer contact wire corresponding to the avoidance gap is provided with a second welding contact point structure.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless charging, and in particular to a circular winding wireless charging coil. Background Art

[0002] Wireless charging technology is a method of transferring electricity between two induction coils using the principle of wireless induction. The existing conventional structure of wireless charging coils is FPC-type wireless charging coils. In actual production, the production process of this type of coil is complicated, and because of the need to set up FPC layers and copper wire layers, its thickness is generally 0.17mm. With the development of lightweight design of mobile phones, the thickness of FPC-type wireless charging coils cannot meet the demand. In addition, since the position of each coil needs to be located during production and the number of radial layers is large, the production is complicated and the production cost is high. Summary of the invention

[0003] In view of the above problems, the present invention provides a circular winding wireless charging coil, which reduces the overall thickness of the entire coil and has a simple structure and low manufacturing cost.

[0004] A circular winding wireless charging coil, characterized in that: it includes a coil carrier with an inner groove for placing the coil, the center of the inner groove is provided with a center hole, the single-layer winding coil is wound to adhere to the first surface of the release film, the second surface of the release film is pressed together with the winding coil and arranged in the inner groove, the inner circle of the single-layer coil is provided with an inwardly convex first inner contact wire, the outer circle of the winding coil is provided with an outwardly convex second outer contact wire, the first inner contact wire and the second outer contact wire are extended at the inner and outer ends of the same diameter, the first inner contact wire is provided with a first welding contact point structure in the inner area relative to the center hole, the outer edge area of ​​the coil carrier relative to the second outer contact wire is provided with an avoidance gap, and the area of ​​the second outer contact wire corresponding to the avoidance gap is provided with a second welding contact point structure.

[0005] It is further characterized by:

[0006] The thickness of the winding coil is 0.12 mm;

[0007] The material of the winding coil is copper;

[0008] The end point of the first inner contact wire relative to the inner area of ​​the central hole is tinned and connected to the first welding contact structure;

[0009] The outer edge of the second external contact wire is tinned and connected to the second welding contact structure;

[0010] The first welding contact point structure and the second welding contact point structure are both hotbar welding structures.

[0011] A method for making a circular winding wireless charging coil, characterized in that: a coil carrier is pre-made, the coil carrier comprising a center hole and an inner groove, the inner grooves are arranged around the outer periphery of the center hole, a first inner contact positioning strip is arranged between the center holes, a first positioning groove is arranged at the center of the first inner contact positioning strip, an avoidance gap is also arranged on the outer periphery of the coil carrier, a second outer contact positioning strip is arranged on the avoidance gap, a second positioning groove is arranged on the second outer contact positioning strip, then a metal wire is wound into a single-layer winding coil, and a second outer contact wire convex outwardly is arranged on the outer ring of the winding coil, the first inner contact wire and the second outer contact wire are extended and arranged at the inner and outer ends of the same diameter, and then a release film is attached to the surface of the winding coil. , and then the winding coil connecting release film is placed in the inner groove, and the upper and lower coil carriers are assembled and pressed to form an integral structure, so that the first inner contact wire and the second outer contact wire are respectively positioned in the corresponding first positioning groove and the second positioning groove, and then the corresponding areas of the first inner contact wire and the second outer contact wire set as contact points are laser stripped by laser, and then the corresponding positions of the first contact of the first inner contact wire and the second contact of the second outer contact wire are tinned, and then hotbar welding is performed at the corresponding positions of the first contact and the second contact, and then the central area of ​​the first inner contact positioning strip and the excess first inner contact wire are removed by laser cutting, and the central area of ​​the second outer contact positioning strip and the excess second outer contact wire are removed by laser.

[0012] It is further characterized by:

[0013] Each winding coil needs to be measured after winding is completed;

[0014] After the coil carrier is manufactured and ready to be loaded with the winding coil, it needs to be sprayed with a barcode and scanned and recorded and entered into the system;

[0015] After the entire structure is laser cut, it passes appearance inspection and LCR test before being packaged and put into storage.

[0016] The wireless charging coil of the present invention is directly formed by winding a metal wire, and the first and second ends of the winding coil are respectively provided with an inwardly convex first inner contact wire and an outwardly convex second outer contact wire. The first inner contact wire and the second outer contact wire are extended at the inner and outer ends of the same diameter, which makes it convenient to position in the subsequent process of forming contacts, and the winding coil is directly pressed into the inner groove after the isolation film is set without an FPC layer, which reduces the overall thickness of the entire coil, and has a simple structure and low manufacturing cost. In addition, the winding coil is formed by directly winding the metal wire, and has good heat dissipation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a schematic diagram of the exploded view structure of the present invention;

[0019] Figure 3 is a flow chart of the manufacturing method of the present invention;

[0020] The names corresponding to the serial numbers in the figure are as follows:

[0021] Coil carrier 1, inner groove 11, center hole 12, first inner contact positioning strip 13, second outer contact positioning strip 14, winding coil 2, first inner contact wire 21, second outer contact wire 22, release film 3, first welding contact point structure 4, avoidance gap 5, second welding contact point structure 6. DETAILED DESCRIPTION

[0022] A circular winding wireless charging coil, see Figure 1 , Figure 2 : It includes a coil carrier 1 with an inner groove 11 for placing a coil, a center hole 12 is arranged at the center of the inner groove 11, a single-layer winding coil 2 is wound and adheres to the first surface of a release film 3, the second surface of the release film 3 is pressed together with the winding coil 2 and arranged in the inner groove 11, the inner circle of the winding coil 2 is provided with an inwardly convex first inner contact wire 21, the outer circle of the winding coil 2 is provided with an outwardly convex second outer contact wire 22, the first inner contact wire 21 and the second outer contact wire 22 are extended at the inner and outer ends of the same diameter, the first inner contact wire 21 is provided with a first welding contact point structure 4 in the inner area relative to the center hole 12, the outer edge area of ​​the coil carrier 1 relative to the second outer contact wire 22 is provided with an avoidance gap 5, and the area of ​​the second outer contact wire 22 corresponding to the avoidance gap 5 is provided with a second welding contact point structure 6.

[0023] The thickness of the winding coil 2 is 0.12 mm;

[0024] The material of the winding coil 2 is copper;

[0025] The first inner contact wire 21 has an end point in the inner area of ​​the central hole 12 and is then tinned to connect to the first soldering contact structure 4;

[0026] The outer edge of the second external contact wire 22 is tinned and connected to the second soldering contact structure 6;

[0027] The first welding contact point structure 4 and the second welding contact point structure 6 are both hotbar welding structures.

[0028] A method for making a circular winding wireless charging coil, see Figure 3: A coil carrier 1 is made in advance, and the coil carrier 1 includes a center hole 12 and an inner groove 11. The inner groove 11 is arranged around the outer periphery of the center hole 12. A first inner contact positioning strip 13 is arranged between the center holes 12, and a first positioning groove is arranged at the center of the first inner contact positioning strip 13. An avoidance gap 5 is also arranged on the outer periphery of the coil carrier 1, and a second outer contact positioning strip 14 is arranged on the avoidance gap 5, and a second positioning groove is arranged on the second outer contact positioning strip 14. Then, the metal wire is wound into a single-layer winding coil 2, and the inner circle of the winding coil 2 is provided with an inwardly convex first inner contact wire 21, and the outer circle is provided with an outwardly convex second outer contact wire 22. The first inner contact wire 21 and the second outer contact wire 22 are extended at the inner and outer ends of the same diameter, and then the surface of the winding coil 2 is adhered to the release film 3, and then the winding coil 2 The release film 3 is built into the inner groove 11, and the upper and lower coil carriers 1 are assembled and pressed to form an integral structure, so that the first inner contact wire 21 and the second outer contact wire 22 are respectively positioned in the corresponding first positioning groove and the second positioning groove, and then the corresponding areas of the first inner contact wire 21 and the second outer contact wire 22 set as contact points are laser stripped by laser, and then the corresponding positions of the first contact of the first inner contact wire 21 and the second contact of the second outer contact wire 22 are tinned, and then hotbar welding is performed at the corresponding positions of the first contact and the second contact, and then the central area of ​​the first inner contact positioning strip 13 and the redundant first inner contact wire 21 are removed by laser cutting, and the central area part of the second outer contact positioning strip 14 and the redundant second outer contact wire 22 are removed by laser.

[0029] Each time the winding coil 2 is wound, it needs to be measured;

[0030] After the coil carrier 1 is manufactured and ready to be loaded with the winding coil, it needs to be sprayed with a barcode and scanned and recorded and entered into the system;

[0031] After the entire structure is laser cut, it passes appearance inspection and LCR test before being packaged and put into storage.

[0032] The principle is as follows: a winding coil is formed directly by winding a metal wire, and the first and last ends of the winding coil are respectively provided with an inwardly convex first inner contact wire and an outwardly convex second outer contact wire. The first inner contact wire and the second outer contact wire are extended at the inner and outer ends of the same diameter, which makes it convenient to position in the subsequent process of forming contacts, and the winding coil is directly pressed into the inner groove after the isolation film is set without an FPC layer, which reduces the overall thickness of the entire coil, and has a simple structure and low production cost. In addition, the winding coil is formed by directly winding the metal wire, and its heat dissipation performance is good.

[0033] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0034] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for manufacturing a circular winding wireless charging coil, characterized in that: It comprises a coil carrier with an inner groove for placing a coil, a center hole is arranged at the center of the inner groove, a single-layer winding coil is wound and adhered to the first surface of a release film, the second surface of the release film and the winding coil are pressed and arranged in the inner groove, the inner circle of the single-layer winding coil is provided with an inwardly convex first inner contact wire, the outer circle of the winding coil is provided with an outwardly convex second outer contact wire, the first inner contact wire and the second outer contact wire are extended at the inner and outer ends of the same diameter, the first inner contact wire is provided with a first welding contact point structure in an inner area relative to the center hole, an outer edge area of ​​the coil carrier relative to the second outer contact wire is provided with an avoidance notch, and an area of ​​the second outer contact wire corresponding to the avoidance notch is provided with a second welding contact point structure; A coil carrier is manufactured in advance, the coil carrier comprises a center hole and an inner groove, the inner groove is arranged around the outer periphery of the center hole, a first inner contact positioning strip is arranged between the center holes, a first positioning groove is arranged at the center of the first inner contact positioning strip, an avoidance gap is also arranged on the outer periphery of the coil carrier, a second outer contact positioning strip is arranged on the avoidance gap, a second positioning groove is arranged on the second outer contact positioning strip, then the metal wire is wound into a single-layer winding coil, and the outer ring of the winding coil is provided with a second protruding outer contact wire, the first inner contact wire and the second outer contact wire are extended at the inner and outer ends of the same diameter, then a release film is attached to the surface of the winding coil, and then the winding coil is connected to the release film Built into the inner groove, the upper and lower coil carriers are assembled and pressed together to form an integral structure, so that the first inner contact wire and the second outer contact wire are respectively positioned in the corresponding first positioning groove and the second positioning groove, and then the corresponding areas of the first inner contact wire and the second outer contact wire set as contact points are laser stripped by laser, and then the corresponding positions of the first contact of the first inner contact wire and the second contact of the second outer contact wire are tinned, and then hotbar welding is performed at the corresponding positions of the first contact and the second contact, and then the central area of ​​the first inner contact positioning strip and the excess first inner contact wire are removed by laser cutting, and the central area part of the second outer contact positioning strip and the excess second outer contact wire are removed by laser.

2. A method for manufacturing a circular wound wireless charging coil as claimed in claim 1, characterized in that :The thickness of the winding coil is 0.12mm.

3. The method for manufacturing a circular wound wireless charging coil according to claim 1, characterized in that: The material of the winding coil is copper.

4. The method for manufacturing a circular wound wireless charging coil according to claim 1, characterized in that: Each winding coil needs to be measured after winding is completed.

5. The method for manufacturing a circular wound wireless charging coil according to claim 1, characterized in that: After the coil carrier is manufactured and ready to be loaded with the winding coil, it needs to be sprayed with a barcode and scanned and recorded and entered into the system.

6. The method for manufacturing a circular wound wireless charging coil according to claim 1, characterized in that: After the entire structure is laser cut, it passes appearance inspection and LCR test before being packaged and put into storage.

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