Manufacturing method of wireless charging coil and wireless charging coil

Abstract

The invention discloses a manufacturing method of a wireless charging coil and the wireless charging coil. The manufacturing method comprises the following steps: laminating a photosensitive adhesive film on a first surface of a pure copper foil; pressing a dry film with a coil pattern on the second surface of the pure copper foil; etching the pure copper foil from the second surface of the pure copper foil, and removing the pure copper foil outside the dry film coverage area; removing the dry film, and laminating a first flexible protective film on the second surface of the pure copper foil; and removing the photosensitive adhesive film, and laminating a second flexible protective film on the first surface of the pure copper foil. According to the technical scheme of the embodiment of the invention, the abnormal risk of subsequent processing of the product can be effectively reduced, the pure copper foil is protected in the manufacturing process, the production efficiency and the yield can be effectively improved, and the cost and the process complexity are effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission, and in particular to a manufacturing method of a wireless charging coil and a wireless charging coil. Background Art

[0002] Currently, there are two main methods for making wireless charging coils. One is to use laser cutting to laser out the coil, and then produce a flexible wireless charging coil by laminating the film. However, the laser cutting process is inefficient and costly. The other is to use a double-sided flexible circuit board to etch the coil to produce a wireless charging coil. The material is a double-sided board. This production method requires the addition of black holes and electroplating processes, which will also lead to problems such as low production efficiency, high cost, complex process and low yield. Summary of the invention

[0003] The present invention provides a method for manufacturing a wireless charging coil and a wireless charging coil, which solves the problems of low production efficiency, high cost, complex process and low yield of current wireless charging coils.

[0004] In a first aspect, the present invention provides a method for manufacturing a wireless charging coil, the manufacturing method comprising:

[0005] Laminating a photosensitive adhesive film on the first surface of the pure copper foil;

[0006] Laminating a dry film having a coil pattern on the second surface of the pure copper foil;

[0007] Etching the pure copper foil from the second surface of the pure copper foil to remove the pure copper foil outside the area covered by the dry film;

[0008] removing the dry film, and laminating a first flexible protective film on the second surface of the pure copper foil;

[0009] The photosensitive adhesive film is removed, and a second flexible protective film is laminated on the first surface of the pure copper foil.

[0010] Optionally, laminating a photosensitive adhesive film on the first surface of the pure copper foil includes:

[0011] bonding a photosensitive adhesive film to the first surface of the pure copper foil;

[0012] The pure copper foil and the photosensitive adhesive film are laminated by a laminator, and the laminating temperature of the laminator is 100±5℃.

[0013] Optionally, laminating a dry film having a coil pattern on the second surface of the pure copper foil, comprising:

[0014] Laminating a dry film on the second surface of the pure copper foil;

[0015] A coil pattern is formed on the dry film through exposure and development processes.

[0016] Optionally, laminating a first flexible protective film on the second surface of the pure copper foil comprises:

[0017] A double-sided adhesive tape is pressed onto the second surface of the pure copper foil, wherein a release film is attached to a side of the double-sided adhesive tape away from the pure copper foil.

[0018] Optionally, double-sided tape is laminated on the second surface of the pure copper foil, including:

[0019] At least one first positioning hole is provided on the double-sided adhesive tape;

[0020] Align and press the double-sided tape and pure copper foil.

[0021] Optional, remove the photosensitive film, including:

[0022] Exposing the photosensitive film to light to reduce the viscosity of the photosensitive film;

[0023] The photosensitive adhesive film is removed from the first surface of the pure copper foil.

[0024] Optionally, laminating a second flexible protective film on the first surface of the pure copper foil comprises:

[0025] A polyimide film is laminated on the first surface of the pure copper foil.

[0026] Optionally, laminating a polyimide film on the first surface of the pure copper foil comprises:

[0027] Disposing at least one second positioning hole on the polyimide film;

[0028] The polyimide film and the pure copper foil are aligned and pressed together.

[0029] Optionally, laminating a first flexible protective film on the second surface of the pure copper foil and laminating a second flexible protective film on the first surface of the pure copper foil comprises:

[0030] bonding a first flexible protective film to the second surface of the pure copper foil;

[0031] The pure copper foil and the first flexible protective film are laminated by a laminating machine, and the laminating temperature of the laminating machine is 80±5℃;

[0032] bonding a second flexible protective film to the first surface of the pure copper foil;

[0033] The pure copper foil and the second flexible protective film are laminated together by a laminator, and the laminating temperature of the laminator is 80±5°C.

[0034] In a second aspect, the present invention provides a wireless charging coil, wherein the wireless charging coil is manufactured using the manufacturing method of the wireless charging coil provided in the first aspect.

[0035] The technical solution of the embodiment of the present invention is to press a photosensitive adhesive film on the first surface of the pure copper foil, press a dry film with a coil pattern on the second surface of the pure copper foil, and use the coil pattern of the dry film to etch the pure copper foil to obtain a pure copper foil with a coil pattern. The dry film and the photosensitive adhesive film are removed, and a first flexible protective film is pressed on the second surface of the pure copper foil, and a second flexible protective film is pressed on the first surface of the pure copper foil to produce a single-sided double-contact flexible wireless charging coil. The technical solution of the embodiment of the present invention adopts a method for making a single-sided hollow plate, that is, single-sided etching of the pure copper foil is performed to finally obtain a double-sided contact flexible wireless charging coil. Compared with the existing production methods of laser cutting and double-sided panel etching coils, the technical solution of the embodiment of the present invention can effectively reduce the risk of abnormal subsequent processing of the product, and provide protection for the pure copper foil during the production process, which can effectively improve production efficiency and yield, and effectively reduce costs and process complexity.

[0036] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 is a flow chart of a method for manufacturing a wireless charging coil provided by an embodiment of the present invention;

[0039] Figure 2-Figure 7 It is a structural schematic diagram corresponding to each step in a method for manufacturing a wireless charging coil provided by an embodiment of the present invention;

[0040] Figure 8 is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention;

[0041] Fig. 9 is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention;

[0042] Fig.10 It is a structural schematic diagram corresponding to some steps in another method for manufacturing a wireless charging coil provided by an embodiment of the present invention;

[0043] Fig.11 is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention;

[0044] Fig.12 is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention;

[0045] Fig.13 is a schematic structural diagram of a first flexible protective film provided by an embodiment of the present invention;

[0046] Fig.14 is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention;

[0047] Figure 15-16 It is a structural schematic diagram corresponding to some steps in another method for manufacturing a wireless charging coil provided by an embodiment of the present invention;

[0048] Fig.17 is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention;

[0049] Fig.18 is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention;

[0050] Fig.19 is a schematic structural diagram of a second flexible protective film provided by an embodiment of the present invention;

[0051] Fig. 20 It is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0053] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0054] Figure 1 is a flow chart of a method for manufacturing a wireless charging coil provided by an embodiment of the present invention. Figure 2-Figure 7 is a schematic structural diagram corresponding to each step in a method for manufacturing a wireless charging coil provided by an embodiment of the present invention, such as Figure 1 As shown, the production method includes:

[0055] S100: Laminating a photosensitive adhesive film on the first surface of the pure copper foil.

[0056] Specifically, Figure 2 and Figure 3 As shown, firstly, a pure copper foil 1 to be processed that meets the processing requirements is provided, and the pure copper foil 1 is provided with a carrier film 2 and is not easy to wrinkle. A photosensitive adhesive film 3 is pressed on the first surface of the pure copper foil 1, and the first surface of the pure copper foil 1 is the side of the pure copper foil 1 away from the carrier film 2. The pure copper foil 1 and the photosensitive adhesive film 3 can be rolled to roll and cut after pressing. This pressing method is not easy to wrinkle. When pressing the pure copper foil 1 and the photosensitive adhesive film 3, the carrier film 2 is retained. The photosensitive adhesive film 3 can be pressed on the rough surface of the pure copper foil 1, and there should be no bubbles or foreign matter during the pressing process to prevent excessive etching due to the infiltration of chemical solution in the later etching process.

[0057] S110: Laminating a dry film having a coil pattern on the second surface of the pure copper foil.

[0058] Specifically, Figure 4 As shown, a dry film 4 having a coil pattern is laminated on the second surface of the pure copper foil 1, and the second surface and the first surface of the pure copper foil 1 are arranged opposite to each other.

[0059] S120: etching the pure copper foil on the second surface of the pure copper foil to remove the pure copper foil outside the dry film covered area.

[0060] Specifically, Figure 5As shown, the pure copper foil 1 is etched from the second surface of the pure copper foil 1 to transfer the coil pattern on the dry film 4 to the pure copper foil 1. That is, the pure copper foil 1 outside the area covered by the dry film 4 is removed to obtain the pure copper foil 1 with the coil pattern.

[0061] S130: removing the dry film, and laminating a first flexible protective film on the second surface of the pure copper foil.

[0062] Specifically, Figure 6 As shown, the dry film 4 is removed, and the pure copper foil 1 with the formed circuit cannot be exposed to the white light for a long time. The pure copper foil with the formed circuit is checked to confirm whether there is a defective circuit. After confirming that there is no defective circuit, the first flexible protective film 5 is pressed on the second surface of the pure copper foil 1. The first flexible protective film 5 can be a flexible protective film with a window, and the shape of the window can be set according to actual requirements.

[0063] S140: removing the photosensitive adhesive film, and laminating a second flexible protective film on the first surface of the pure copper foil.

[0064] Specifically, Figure 7 As shown, after removing the photosensitive adhesive film 3, the second flexible protective film 6 is pressed on the first surface of the pure copper foil 1. The second flexible protective film 6 can be a flexible protective film with a window, and the shape of the window can be set according to actual requirements. The technical solution of the embodiment of the present invention produces a flexible wireless charging coil with double contacts on one side. A flexible wireless charging coil with double contacts on one side is realized by making a flexible circuit board using a non-traditional circuit board process. A single-sided hollow board manufacturing method is adopted, that is, the pure copper foil is single-sidedly etched, and finally a flexible wireless charging coil with double contacts is obtained.

[0065] The technical solution of the embodiment of the present invention is to press a photosensitive adhesive film on the first surface of the pure copper foil, press a dry film with a coil pattern on the second surface of the pure copper foil, and use the coil pattern of the dry film to etch the pure copper foil to obtain a pure copper foil with a coil pattern. The dry film and the photosensitive adhesive film are removed, and a first flexible protective film is pressed on the second surface of the pure copper foil, and a second flexible protective film is pressed on the first surface of the pure copper foil to produce a single-sided double-contact flexible wireless charging coil. The technical solution of the embodiment of the present invention adopts a method for making a single-sided hollow plate, that is, single-sided etching of the pure copper foil is performed to finally obtain a double-sided contact flexible wireless charging coil. Compared with the existing production methods of laser cutting and double-sided panel etching coils, the technical solution of the embodiment of the present invention can effectively reduce the risk of abnormal subsequent processing of the product, and provide protection for the pure copper foil during the production process, which can effectively improve production efficiency and yield, and effectively reduce costs and process complexity.

[0066] Optionally, based on the above embodiments, Figure 8 is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention, such as Figure 8 As shown, the production method includes:

[0067] S200: bonding the photosensitive adhesive film to the first surface of the pure copper foil.

[0068] Specifically, Figure 3 As shown, the photosensitive adhesive film 3 is first bonded to the first surface of the pure copper foil 1. The photosensitive adhesive film 3 can be a sticky photosensitive adhesive film with a backing adhesive. The first surface of the pure copper foil 1 is the side of the pure copper foil 1 away from the carrier film 2. The pure copper foil 1 and the photosensitive adhesive film 3 can be bonded roll to roll, and the photosensitive adhesive film 3 can be bonded to the rough surface of the pure copper foil 1.

[0069] S210: Pure copper foil and photosensitive adhesive film are laminated by a laminator, and the laminating temperature of the laminator is 100±5℃.

[0070] Specifically, Figure 3 As shown, after the sticky photosensitive film 3 is bonded to the first surface of the pure copper foil 1, a laminator is used to perform single-sided lamination to press the pure copper foil 1 and the photosensitive film 3 together. The lamination temperature of the laminator can be set to 100±5°C. The lamination temperature is low and will not cause wrinkles on the photosensitive film 3 and the pure copper foil 1. The pure copper foil 1 and the photosensitive film 3 can be rolled to roll and cut after lamination. This lamination method is not prone to wrinkles. There should be no bubbles or foreign matter during the lamination process to prevent over-etching by infiltration of chemical solution in the later etching process.

[0071] S220: Laminating a dry film having a coil pattern on the second surface of the pure copper foil.

[0072] S230: etching the pure copper foil on the second surface of the pure copper foil to remove the pure copper foil outside the dry film covered area.

[0073] S240: removing the dry film, and laminating a first flexible protective film on the second surface of the pure copper foil.

[0074] S250: removing the photosensitive adhesive film, and laminating a second flexible protective film on the first surface of the pure copper foil.

[0075] Optionally, based on the above embodiments, Fig. 9 is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention. Fig.10 is a structural schematic diagram corresponding to some steps in another method for manufacturing a wireless charging coil provided by an embodiment of the present invention, such as Fig. 9 As shown, the production method includes:

[0076] S300: Laminating a photosensitive adhesive film on the first surface of the pure copper foil.

[0077] S310: Laminating a dry film on the second surface of the pure copper foil.

[0078] Specifically, Fig.10 As shown, a complete dry film 4 is pressed on the entire surface of the second surface of the pure copper foil 1. The dry film 4 can be pressed on the bright surface of the pure copper foil 1, and there must be no bubbles or foreign matter during the pressing process to prevent over-etching by seepage of chemical solution in the subsequent etching process.

[0079] S320: forming a coil pattern on the dry film through exposure and development processes.

[0080] Specifically, Figure 4 As shown, after the entire surface of the second surface of the pure copper foil 1 is pressed with a complete dry film 4, the pattern of the mask can be transferred to the dry film 4 through an exposure process to obtain the required pattern. Then, the dry film 4 with a coil pattern is formed through processes such as development, etching and drying.

[0081] S330: etching the pure copper foil on the second surface of the pure copper foil to remove the pure copper foil outside the dry film covered area.

[0082] S340: removing the dry film, and laminating a first flexible protective film on the second surface of the pure copper foil.

[0083] S350: removing the photosensitive adhesive film, and laminating a second flexible protective film on the first surface of the pure copper foil.

[0084] Optionally, based on the above embodiments, Fig.11 is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention, such as Fig.11 As shown, the production method includes:

[0085] S400: Laminating a photosensitive adhesive film on the first surface of the pure copper foil.

[0086] S410: Laminating a dry film having a coil pattern on the second surface of the pure copper foil.

[0087] S420: etching the pure copper foil on the second surface of the pure copper foil to remove the pure copper foil outside the dry film covered area.

[0088] S430: removing the dry film, and laminating a double-sided adhesive tape on the second surface of the pure copper foil, wherein a release film is affixed to a side of the double-sided adhesive tape away from the pure copper foil.

[0089] Specifically, Figure 6 As shown, the dry film 4 is removed, and the first flexible protective film 5 is pressed on the second surface of the pure copper foil 1. The first flexible protective film 5 can be a double-sided adhesive tape, and the side of the double-sided adhesive tape away from the pure copper foil 1 is affixed with a release film. Exemplarily, the pure copper foil 1 with a circuit is combined with the double-sided adhesive tape, and the double-sided adhesive tape can be a double-sided adhesive tape with a window, and the shape of the window can be set according to actual requirements. Then, the double-sided adhesive tape, the pure copper foil 1 and the photosensitive adhesive film 3 are integrated into one according to a preset pressure to obtain a primary material.

[0090] Optionally, the first flexible protective film 5 can also be a polyimide film (PI). For example, the pure copper foil 1 with circuits is combined with a PI film, and the PI film can be a PI film with windows, and the shape of the windows can be set according to actual requirements. Then, the PI film, the pure copper foil 1 and the photosensitive adhesive film 3 are combined into one according to a preset pressure to obtain a primary material.

[0091] S440: removing the photosensitive adhesive film, and laminating a second flexible protective film on the first surface of the pure copper foil.

[0092] Optionally, based on the above embodiments, Fig.12 is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention. Fig.13 is a schematic structural diagram of a first flexible protective film provided by an embodiment of the present invention, such as Fig.12 As shown, the production method includes:

[0093] S500: Laminating a photosensitive adhesive film on the first surface of the pure copper foil.

[0094] S510: Laminating a dry film having a coil pattern on the second surface of the pure copper foil.

[0095] S520: etching the pure copper foil on the second surface of the pure copper foil to remove the pure copper foil outside the dry film covered area.

[0096] S530: Setting at least one first positioning hole on the double-sided adhesive tape.

[0097] Specifically, Figure 6 and Fig.13 As shown, the first flexible protective film 5 can be provided with a plurality of first positioning holes 51 , and the positions and number of the first positioning holes 51 can be set according to specific needs, which are not specifically limited here. Fig.13 The first flexible protective film 5 is exemplarily shown to be provided with six first positioning holes 51. Exemplarily, the first flexible protective film 5 can be a double-sided adhesive tape, and before the double-sided adhesive tape is pressed onto the second surface of the pure copper foil 1, a plurality of first positioning holes 51 are first provided on the double-sided adhesive tape.

[0098] S540: removing the dry film, and aligning and laminating the double-sided adhesive tape and the pure copper foil, wherein a release film is attached to a side of the double-sided adhesive tape away from the pure copper foil.

[0099] Specifically, Figure 6 and Fig.13As shown, the double-sided tape provided with the first positioning hole 51 is aligned and pressed on the second surface of the pure copper foil 1. The first positioning hole 51 can be pressed in correspondence with the pre-set position to ensure that the double-sided tape is aligned and pressed on the second surface of the pure copper foil 1. Before pressing, check whether the first positioning hole 51 is biased or broken to prevent poor pressing during pressing, resulting in pressing deviation. The technical solution of the embodiment of the present invention can ensure that the first flexible protective film 5 and the pure copper foil 1 will not have the problem of pressing deviation during pressing by setting the first positioning hole 51.

[0100] S550: removing the photosensitive adhesive film, and laminating a second flexible protective film on the first surface of the pure copper foil.

[0101] Optionally, based on the above embodiments, Fig.14 is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention. Figure 15-16 is a structural schematic diagram corresponding to some steps in another method for manufacturing a wireless charging coil provided by an embodiment of the present invention, such as Fig.14 As shown, the production method includes:

[0102] S600: Laminating a photosensitive adhesive film on the first surface of the pure copper foil.

[0103] S610: Laminating a dry film having a coil pattern on the second surface of the pure copper foil.

[0104] S620: etching the pure copper foil on the second surface of the pure copper foil to remove the pure copper foil outside the dry film covered area.

[0105] S630: removing the dry film, and laminating a first flexible protective film on the second surface of the pure copper foil.

[0106] S640: exposing the photosensitive film to light to reduce the viscosity of the photosensitive film.

[0107] Specifically, Fig.15 As shown, an exposure machine is used to irradiate the photosensitive adhesive film 3. During the exposure process, attention should be paid to the exposure time and exposure energy, and the peeling force for tearing off the photosensitive adhesive film 3 later should be determined according to the exposure time and exposure energy. In the ultraviolet light environment, the viscosity of the photosensitive adhesive film 3 is greatly reduced.

[0108] S650: removing the photosensitive adhesive film from the first surface of the pure copper foil.

[0109] Specifically, Fig.16 As shown, the photosensitive adhesive film is torn off from the first surface of the pure copper foil 1. When tearing off the photosensitive adhesive film, it should be noted that the pure copper foil with the coil pattern will not be affected. After removing the photosensitive adhesive film, the pure copper foil 1 with the coil pattern is formed on the first flexible protective film 5.

[0110] S660: Laminating a second flexible protective film on the first surface of the pure copper foil.

[0111] Optionally, based on the above embodiments, Fig.17 is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention, such as Fig.17 As shown, the production method includes:

[0112] S700: Laminating a photosensitive adhesive film on the first surface of the pure copper foil.

[0113] S710: Laminating a dry film having a coil pattern on the second surface of the pure copper foil.

[0114] S720: etching the pure copper foil on the second surface of the pure copper foil to remove the pure copper foil outside the dry film covered area.

[0115] S730: removing the dry film, and laminating a first flexible protective film on the second surface of the pure copper foil.

[0116] S740: removing the photosensitive adhesive film and laminating a polyimide film on the first surface of the pure copper foil.

[0117] Specifically, Figure 7 As shown, after removing the photosensitive adhesive film 3, the second flexible protective film 6 is pressed on the first surface of the pure copper foil 1. Exemplarily, the second flexible protective film 6 can be a polyimide film (PI). The PI film can be a PI film with a window, and the shape of the window can be set according to actual requirements. Optionally, the second flexible protective film 6 can also be a double-sided adhesive, and the double-sided adhesive can be a double-sided adhesive with a window, and the shape of the window can be set according to actual requirements.

[0118] Optionally, based on the above embodiments, Fig.18 is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention. Fig.19 is a schematic diagram of the structure of a second flexible protective film provided by an embodiment of the present invention, such as Fig.18 As shown, the production method includes:

[0119] S800: Laminating a photosensitive adhesive film on the first surface of the pure copper foil.

[0120] S810: Laminating a dry film having a coil pattern on the second surface of the pure copper foil.

[0121] S820: etching the pure copper foil on the second surface of the pure copper foil to remove the pure copper foil outside the dry film coverage area.

[0122] S830: removing the dry film, and laminating a first flexible protective film on the second surface of the pure copper foil.

[0123] S840: Disposing at least one second positioning hole on the polyimide film.

[0124] Specifically, Figure 7 and Fig.19 As shown, the second flexible protective film 6 can be provided with a plurality of second positioning holes 61 , and the positions and number of the second positioning holes 61 can be set according to specific needs, which are not specifically limited here. Fig.19 The second flexible protective film 6 is exemplarily shown to be provided with six second positioning holes 61. Exemplarily, the second flexible protective film 6 may be a PI film, and before the PI film is pressed onto the first surface of the pure copper foil 1, a plurality of second positioning holes 61 are first provided on the PI film.

[0125] S850: Align and laminate the polyimide film and pure copper foil.

[0126] Specifically, Figure 7 and Fig.19 As shown, the PI film provided with the second positioning hole 61 is aligned and pressed on the first surface of the pure copper foil 1. The second positioning hole 61 can be pressed in correspondence with the pre-set position to ensure that the PI film is aligned and pressed on the first surface of the pure copper foil 1. Before pressing, check whether the second positioning hole 61 is biased or broken to prevent poor pressing during pressing, resulting in pressing deviation. The technical solution of the embodiment of the present invention can ensure that the second flexible protective film 6 and the pure copper foil 1 will not have the problem of pressing deviation during pressing by setting the second positioning hole 61.

[0127] Optionally, based on the above embodiments, Fig. 20 is a flow chart of another method for manufacturing a wireless charging coil provided by an embodiment of the present invention, such as Fig. 20 As shown, the production method includes:

[0128] S900: Laminating a photosensitive adhesive film on the first surface of the pure copper foil.

[0129] S910: Laminating a dry film having a coil pattern on the second surface of the pure copper foil.

[0130] S920: etching the pure copper foil on the second surface of the pure copper foil to remove the pure copper foil outside the dry film coverage area.

[0131] S930: removing the dry film, and bonding the first flexible protective film to the second surface of the pure copper foil.

[0132] Specifically, Figure 6 As shown, after removing the dry film, the first flexible protective film 5 is first bonded to the second surface of the pure copper foil 1 . The first flexible protective film 5 may be a flexible protective film with adhesive backing.

[0133] S940: Laminating the pure copper foil and the first flexible protective film by a laminating machine, wherein the laminating temperature of the laminating machine is 80±5°C.

[0134] Specifically, Figure 6 As shown, after the first flexible protective film 5 is bonded to the second surface of the pure copper foil 1, a roller press is used to press the pure copper foil 1 and the first flexible protective film 5. When the pure copper foil 1 and the first flexible protective film 5 are pressed together using a roller press, heating is not required. The lamination temperature can be 80±5°C.

[0135] S950: removing the photosensitive adhesive film, and bonding the second flexible protective film to the first surface of the pure copper foil.

[0136] Specifically, Figure 7 As shown, after removing the photosensitive adhesive film, the second flexible protective film 6 is first bonded to the first surface of the pure copper foil 1. The second flexible protective film 6 can be a flexible protective film with adhesive backing.

[0137] S960: The pure copper foil and the second flexible protective film are laminated by a laminating machine, and the laminating temperature of the laminating machine is 80±5℃.

[0138] Specifically, Figure 7 As shown, after the second flexible protective film 6 is bonded to the second surface of the pure copper foil 1, a roller press is used to press the pure copper foil 1 and the second flexible protective film 6. When the pure copper foil 1 and the second flexible protective film 6 are pressed together using a roller press, heating is not required. The lamination temperature can be 80±5°C.

[0139] The technical solution of the embodiment of the present invention does not have a hot pressing process in the process of making a wireless charging coil. In the conventional process of making a soft board in the prior art, a hot pressing covering film process is required, and hot pressing can cause problems such as wrinkles and over-etching at the double contact position. The technical solution of the embodiment of the present invention can effectively solve the problems of wrinkles and over-etching at the double contact position during pressing because there is no hot pressing process.

[0140] The technical solution of the embodiment of the present invention provides a wireless charging coil, wherein the wireless charging coil is manufactured using any of the manufacturing methods of the wireless charging coil provided by any of the above embodiments, and has the beneficial effects of any of the manufacturing methods of the wireless charging coil provided by any of the above embodiments of the present invention.

[0141] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0142] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for manufacturing a wireless charging coil, characterized in that: include: Laminating a photosensitive adhesive film on the first surface of the pure copper foil; Laminating a dry film having a coil pattern on the second surface of the pure copper foil; Etching the pure copper foil from the second surface of the pure copper foil to remove the pure copper foil outside the area covered by the dry film; removing the dry film, and laminating a first flexible protective film on the second surface of the pure copper foil; The photosensitive adhesive film is removed, and a second flexible protective film is pressed on the first surface of the pure copper foil.

2. The method for manufacturing a wireless charging coil according to claim 1, characterized in that: A photosensitive adhesive film is laminated on the first surface of the pure copper foil, comprising: Bonding the photosensitive adhesive film to the first surface of the pure copper foil; The pure copper foil and the photosensitive adhesive film are laminated together by a laminating machine, and the laminating temperature of the laminating machine is 100±5°C.

3. The method for manufacturing a wireless charging coil according to claim 1, characterized in that: Laminating a dry film having a coil pattern on the second surface of the pure copper foil, comprising: Laminating a dry film on the second surface of the pure copper foil; A coil pattern is formed on the dry film through exposure and development processes.

4. The method for manufacturing a wireless charging coil according to claim 1, characterized in that: Laminating a first flexible protective film on the second surface of the pure copper foil, comprising: A double-sided adhesive tape is pressed onto the second surface of the pure copper foil, wherein a release film is attached to a side of the double-sided adhesive tape away from the pure copper foil.

5. The method for manufacturing a wireless charging coil according to claim 4, characterized in that: Laminating double-sided adhesive on the second surface of the pure copper foil, comprising: At least one first positioning hole is provided on the double-sided adhesive tape; The double-sided adhesive tape and the pure copper foil are aligned and pressed together.

6. The method for manufacturing a wireless charging coil according to claim 1, characterized in that: Removing the photosensitive adhesive film comprises: Exposing the photosensitive adhesive film to light to reduce the viscosity of the photosensitive adhesive film; The photosensitive adhesive film is removed from the first surface of the pure copper foil.

7. The method for manufacturing a wireless charging coil according to claim 1, characterized in that: Laminating a second flexible protective film on the first surface of the pure copper foil, comprising: A polyimide film is laminated on the first surface of the pure copper foil.

8. The method for manufacturing a wireless charging coil according to claim 7, characterized in that: Laminating a polyimide film on the first surface of the pure copper foil comprises: Disposing at least one second positioning hole on the polyimide film; The polyimide film and the pure copper foil are aligned and pressed.

9. The method for manufacturing a wireless charging coil according to claim 1, characterized in that: Laminating a first flexible protective film on the second surface of the pure copper foil and laminating a second flexible protective film on the first surface of the pure copper foil, comprising: bonding the first flexible protective film to the second surface of the pure copper foil; Laminating the pure copper foil and the first flexible protective film by a laminating machine, wherein the laminating temperature of the laminating machine is 80±5° C.; bonding the second flexible protective film to the first surface of the pure copper foil; The pure copper foil and the second flexible protective film are laminated by a laminating machine, and the laminating temperature of the laminating machine is 80±5°C.

10. A wireless charging coil, characterized in that: The wireless charging coil is manufactured by the manufacturing method of the wireless charging coil according to any one of claims 1 to 9.

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