阅读说明：本技术 一种无线充电线圈模组及其制备方法 (Wireless charging coil module and preparation method thereof ) 是由 钱江华 徐可心 林涛 吴长和 郭庆文 霍云芳 王劲 于 2021-01-18 设计创作，主要内容包括：本发明提供一种无线充电线圈模组及其制备方法,由柔性线圈和隔磁片层叠形成,柔性线圈和隔磁片通过导热双面胶层粘接；柔性线圈包括：衬底层；衬底层的上表面和下表面分别依次层叠有镀铜层、导热双面胶层以及第一保护膜；衬底层钻有若干开孔,位于衬底层的上表面和下表面的镀铜层之间通过开孔电性连通；隔磁片包括：隔磁作用层,由至少一层经过破碎处理的隔磁材料层组成；第二保护膜,第二保护膜通过导热双面胶层分别粘接在隔磁作用层的上表面和下表面。本发明的无线充电线圈模组厚度适中、大幅度降低工作时的温升情况,散热效果好,可以在长时间实现高效率无线充电,适合大功率无线充电。(The invention provides a wireless charging coil module and a preparation method thereof, wherein the wireless charging coil module is formed by laminating a flexible coil and a magnetism isolating sheet, and the flexible coil and the magnetism isolating sheet are bonded through a heat-conducting double-sided adhesive layer; the flexible coil includes: a substrate layer; the upper surface and the lower surface of the substrate layer are respectively and sequentially laminated with a copper plating layer, a heat-conducting double-sided adhesive layer and a first protective film; the substrate layer is drilled with a plurality of openings, and the copper plating layers positioned on the upper surface and the lower surface of the substrate layer are electrically communicated through the openings; the magnetism isolating sheet includes: the magnetic isolation layer consists of at least one magnetic isolation material layer which is subjected to crushing treatment; and the second protective film is respectively bonded on the upper surface and the lower surface of the magnetism isolating action layer through a heat-conducting double-sided adhesive layer. The wireless charging coil module is moderate in thickness, greatly reduces the temperature rise condition during working, has a good heat dissipation effect, can realize high-efficiency wireless charging for a long time, and is suitable for high-power wireless charging.)

1. A wireless charging coil module is characterized by being formed by laminating a flexible coil and a magnetism isolating sheet, wherein the flexible coil and the magnetism isolating sheet are bonded through a heat-conducting double-sided adhesive layer (5);

the flexible coil includes:

a substrate layer;

the upper surface and the lower surface of the substrate layer are respectively and sequentially laminated with a copper plating layer (2), the heat-conducting double-sided adhesive layer (5) and a first protective film (1);

the substrate layer is drilled with a plurality of openings, and the copper plating layers (2) positioned on the upper surface and the lower surface of the substrate layer are electrically communicated through the openings;

the magnetism isolating sheet comprises:

the magnetic isolation action layer consists of at least one magnetic isolation material layer (7) which is subjected to crushing treatment;

and the second protective film (6) is bonded on the upper surface and the lower surface of the magnetism isolating action layer respectively through the heat-conducting double-sided adhesive layer (5).

2. The wireless charging coil module according to claim 1, wherein the first protective film (1) is a polyimide film (1) containing a graphene coating, and the polyimide film (1) is subjected to high-temperature carbonization and high-temperature graphitization.

3. The wireless charging coil module according to claim 1, characterized in that the second protective film (6) comprises:

the heat-conducting substrate layer is made of polyethylene terephthalate;

the coating layer is coated on the outer surface of the heat-conducting base material layer, and the coating layer is made of graphene.

4. The wireless charging coil module of claim 1, wherein the substrate layer comprises:

the thin film layer (4), the thin film layer (4) is a polyimide film which is subjected to high-temperature carbonization and high-temperature graphitization treatment;

the copper substrate layer (3), the copper substrate layer (3) is pressed respectively in the upper surface and the lower surface of the thin film layer (4).

5. The wireless charging coil module of claim 1,

the magnetism isolating action layer is formed by overlapping at least two magnetism isolating material layers (7) which are subjected to crushing treatment, and the magnetism isolating material layers (7) are bonded through the heat-conducting double-sided adhesive layer (5).

6. The wireless charging coil module according to claim 5, wherein the thermally conductive double-sided adhesive layer (5) is a thermally conductive film substrate containing polyethylene terephthalate.

7. The wireless charging coil module according to claim 5, wherein the magnetic isolation material layer is a soft magnetic amorphous material layer or a nanocrystalline material layer.

8. A preparation method of a wireless charging coil module, which is applied to the preparation of the wireless charging coil module according to any one of claims 1 to 7, and comprises the following steps:

step A1, preparing a flexible coil and a magnetism isolating sheet;

step A2, attaching the upper surface or the lower surface of the flexible coil to a heat-conducting double-sided adhesive layer (5);

step A3, attaching the side, attached with the heat-conducting double-sided adhesive layer (5), of the flexible coil to the magnetism isolating sheet to prepare and form the wireless charging coil module;

in step a1, the step of preparing the flexible coil includes:

step B1, forming a plurality of openings on the substrate layer, and then respectively preparing copper plating layers on the upper surface and the lower surface of the substrate layer, wherein the copper plating layers are electrically connected through the openings;

step B2, respectively attaching the heat-conducting double-sided adhesive layer (5) to the surface of the copper plating layer;

step B3, respectively attaching first protective films (1) to the surfaces of the heat-conducting double-sided adhesive layers (5) to prepare and form the flexible coil;

in the step a1, the step of preparing the magnetic separator sheet includes:

c1, attaching a heat-conducting double-sided adhesive layer (5) to one side of the magnetism isolating material layer (7), then crushing, and overlapping at least one layer of the magnetism isolating material layer (7) which is subjected to crushing treatment to form a magnetism isolating action layer;

step C2, attaching the surface of the magnetism isolating action layer, which does not contain the heat-conducting double-sided adhesive layer (5), to the heat-conducting double-sided adhesive layer (5), and then respectively attaching the upper surface and the lower surface of the magnetism isolating action layer to the second protective film (6);

and step C3, die cutting and forming the magnetic isolating layer to prepare and form the magnetic isolating sheet.

9. The method for preparing a wireless charging coil module according to claim 8, wherein the heat-conducting double-sided adhesive layer (5) is a heat-conducting film substrate containing polyethylene terephthalate.

Technical Field

The invention relates to the technical field of wireless charging, in particular to a wireless charging coil module and a preparation method thereof.

Background

The wireless charging technology is a novel technology, develops rapidly in recent years, is widely applied, and can be used for charging intelligent wearable equipment (watches), smart phone panels, wireless phones, electric vehicles and the like.

However, the wireless charging process usually suffers from the technical problems of serious charging heat generation, poor heat dissipation of a contact part between the transmitting end and the receiving end, low charging efficiency, high cost, large charging limitation and the like. The coil of the wireless charging module needs a separate substrate to be integrated into the electronic device, and in recent years, along with the increase of wireless charging power, higher requirements are put on the wireless charging module by the working efficiency under the working temperature rise and high power.

An alternating electromagnetic field can be generated in the wireless charging process, when the alternating electromagnetic field meets metal, electronic eddy current can be generated, heat energy is generated on the metal, the transmission efficiency is low, electric energy is wasted, if a metal plate in a rechargeable battery is influenced by the magnetic field, the generated eddy current loss can cause the battery to be hot, explosion or fire is unsafe, and the magnetic field can interfere surrounding devices to influence the normal work of the whole charger. Normally, a magnetic isolation material is adopted to block the leakage of magnetic lines of force so as to ensure the safe and efficient work of the whole charging system, and in practical application, the coils of the transmitting end and the receiving end are both placed on the magnetic isolation material so as to achieve the purposes of improving the efficiency and reducing the interference.

The flexible coil and the traditional magnetic shielding sheet in the traditional preparation method are combined to have low efficiency and high working temperature, and are not suitable for high-power charging.

Therefore, how to reduce heat generation, enhance heat dissipation, increase the temperature rise of the module, and improve the wireless charging efficiency for a long time has become one of the problems to be solved by those skilled in the art.

Disclosure of Invention

The invention provides a wireless charging coil module and a preparation method thereof, and aims to solve the technical problems that a flexible coil and a magnetism isolating sheet are combined in the prior art, the working efficiency is low, the temperature is increased, and the wireless charging coil module is not suitable for high-power charging.

A wireless charging coil module is formed by laminating a flexible coil and a magnetism isolating sheet, wherein the flexible coil and the magnetism isolating sheet are bonded through a heat-conducting double-sided adhesive layer;

the flexible coil includes:

a substrate layer;

the upper surface and the lower surface of the substrate layer are respectively and sequentially laminated with a copper plating layer, a heat-conducting double-sided adhesive layer and a first protective film;

the substrate layer is drilled with a plurality of openings, and the copper plating layers positioned on the upper surface and the lower surface of the substrate layer are electrically communicated through the openings;

the magnetism isolating sheet includes:

the magnetic isolation layer consists of at least one magnetic isolation material layer which is subjected to crushing treatment;

and the second protective film is respectively bonded on the upper surface and the lower surface of the magnetism isolating action layer through a heat-conducting double-sided adhesive layer.

Further, the first protection film is a polyimide film containing a graphene coating, and the polyimide film is subjected to high-temperature carbonization and high-temperature graphitization treatment.

Further, the second protective film includes:

the heat conducting substrate layer is made of polyethylene terephthalate;

the coating layer coats the surface of heat conduction substrate layer in the coating, and the material in coating layer is graphite alkene.

Further, the substrate layer includes:

the thin film layer is a polyimide thin film subjected to high-temperature carbonization and high-temperature graphitization treatment;

and the copper substrate layer is respectively pressed on the upper surface and the lower surface of the thin film layer.

Furthermore, the magnetism isolating action layer is formed by superposing at least two magnetism isolating material layers which are subjected to crushing treatment, and the magnetism isolating material layers are respectively bonded through a heat-conducting double-sided adhesive layer.

Further, the heat-conducting double-sided adhesive layer is a heat-conducting film substrate containing polyethylene terephthalate.

Further, the magnetism isolating material layer is a soft magnetic amorphous material layer or a nanocrystalline material layer.

A preparation method of a wireless charging coil module is applied to the preparation of the wireless charging coil module, and comprises the following steps:

step A1, preparing a flexible coil and a magnetism isolating sheet;

step A2, attaching the upper surface or the lower surface of the flexible coil to a heat-conducting double-sided adhesive layer;

step A3, attaching one surface of the flexible coil, which is attached with the heat-conducting double-sided adhesive layer, to the magnetism isolating sheet to prepare and form a wireless charging coil module;

in step a1, the step of preparing the flexible coil includes:

step B1, forming a plurality of openings on the substrate layer, and then respectively preparing copper plating layers on the upper surface and the lower surface of the substrate layer, wherein the copper plating layers are electrically connected through the openings;

step B2, respectively attaching a heat-conducting double-sided adhesive layer to the surface of the copper-plated layer;

step B3, respectively attaching first protective films to the surfaces of the heat-conducting double-sided adhesive layers to prepare and form flexible coils;

in step a1, the step of preparing the magnetic separator sheet comprises:

step C1, attaching a heat-conducting double-sided adhesive layer to one side of the magnetism isolating material layer, crushing, and overlapping at least one layer of magnetism isolating material layer after crushing treatment to form a magnetism isolating action layer;

step C2, attaching the surface of the magnetism isolating action layer, which does not contain the heat-conducting double-sided adhesive layer, to the heat-conducting double-sided adhesive layer, and then respectively attaching the upper surface and the lower surface of the magnetism isolating action layer to second protective films;

and step C3, die cutting and forming the magnetic isolating layer to prepare the magnetic isolating sheet.

Further, the heat-conducting double-sided adhesive layer is a heat-conducting film substrate containing polyethylene terephthalate.

The beneficial technical effects of the invention are as follows: the wireless charging coil module is moderate in thickness, greatly reduces the temperature rise condition during working, has a good heat dissipation effect, can realize high-efficiency wireless charging for a long time, and is suitable for high-power wireless charging.

Drawings

Fig. 1 is a schematic diagram of a wireless charging coil module according to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating the general steps of a method for manufacturing a wireless charging coil module according to the present invention;

FIG. 3 is a flowchart illustrating steps of a method for manufacturing a flexible coil according to the present invention;

fig. 4 is a flow chart illustrating steps of a method for manufacturing a magnetic shield sheet of a wireless charging coil module according to the present invention.

Wherein the content of the first and second substances,

1-a first protection film;

2-plating a copper layer;

3-a copper substrate layer;

4-carbonizing the graphitized polyimide film at a high temperature;

5-heat-conducting double-sided adhesive layer;

6-a second protective film;

7-a layer of magnetic isolating material;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

Referring to fig. 1, the wireless charging coil module is formed by stacking a flexible coil and a magnetism isolating sheet, wherein the flexible coil and the magnetism isolating sheet are bonded through a heat-conducting double-sided adhesive layer (5);

the flexible coil includes:

a substrate layer;

the upper surface and the lower surface of the substrate layer are respectively and sequentially laminated with a copper plating layer (2), a heat-conducting double-sided adhesive layer (5) and a first protective film (1);

the substrate layer is drilled with a plurality of openings, and the copper plating layers (2) positioned on the upper surface and the lower surface of the substrate layer are electrically communicated through the openings;

the magnetism isolating sheet includes:

the magnetic isolation action layer consists of at least one magnetic isolation material layer (7) which is subjected to crushing treatment;

and the second protective film (6) is respectively bonded on the upper surface and the lower surface of the magnetism isolating action layer through the heat-conducting double-sided adhesive layer (5).

Further, the first protection film (1) is a polyimide film (1) containing a graphene coating, and the polyimide film (1) is subjected to high-temperature carbonization and high-temperature graphitization treatment.

Preferably, the first protective film (1) is black.

Further, the second protective film (6) includes:

the heat conducting substrate layer is made of polyethylene terephthalate;

the coating layer coats the surface of heat conduction substrate layer in the coating, and the material in coating layer is graphite alkene.

Preferably, the second protective film (6) is black.

Further, the substrate layer includes:

the thin film layer (4), the thin film layer (4) is a polyimide film which is subjected to high-temperature carbonization and high-temperature graphitization treatment;

the copper substrate layer (3), copper substrate layer (3) are pressed respectively in the upper surface and the lower surface of thin film layer (4).

Furthermore, the magnetism isolating action layer is formed by overlapping at least two magnetism isolating material layers (7) which are subjected to crushing treatment, and the magnetism isolating material layers (7) are respectively bonded through a heat-conducting double-sided adhesive layer (5).

Further, the heat-conducting double-sided adhesive layer (5) is a heat-conducting film substrate (PET heat-conducting film substrate) containing polyethylene terephthalate.

Further, the magnetism isolating material layer is a soft magnetic amorphous material layer or a nanocrystalline material layer.

Referring to fig. 2, the present invention provides a method for manufacturing a wireless charging coil module, which is applied to the manufacturing of the wireless charging coil module, and includes the following steps:

step A1, preparing a flexible coil and a magnetism isolating sheet;

step A2, attaching the upper surface or the lower surface of the flexible coil to a heat-conducting double-sided adhesive layer (5);

step A3, attaching one surface of the flexible coil, which is attached with the heat-conducting double-sided adhesive layer (5), to a magnetic separation sheet to prepare and form a wireless charging coil module;

in step a1, the step of preparing the flexible coil includes:

step B1, forming a plurality of openings on the substrate layer, and then respectively preparing copper plating layers on the upper surface and the lower surface of the substrate layer, wherein the copper plating layers are electrically connected through the openings;

step B2, respectively attaching a heat-conducting double-sided adhesive layer (5) to the surface of the copper-plated layer;

step B3, respectively attaching a first protective film (1) to the surface of the heat-conducting double-sided adhesive layer (5) to prepare and form a flexible coil;

in step a1, the step of preparing the magnetic separator sheet comprises:

c1, attaching a heat-conducting double-sided adhesive layer (5) to one side of the magnetism isolating material layer (7), crushing, and overlapping at least one broken magnetism isolating material layer (7) to form a magnetism isolating action layer;

step C2, attaching the surface of the magnetism isolating action layer, which does not contain the heat-conducting double-sided adhesive layer (5), to the heat-conducting double-sided adhesive layer (5), and then respectively attaching the upper surface and the lower surface of the magnetism isolating action layer to the second protective film (6);

and step C3, die cutting and forming the magnetic isolating layer to prepare the magnetic isolating sheet.

Further, the heat-conducting double-sided adhesive layer (5) is a heat-conducting film base material containing polyethylene terephthalate.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.