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High-thermal-conductivity composite magnetism isolating sheet for wireless charging receiving end and preparation method thereof

A wireless charging and receiving end technology, applied in the manufacture of inductors/transformers/magnets, transformer/inductor cores, preventing/reducing unwanted electric/magnetic effects, etc., can solve the problem of affecting the efficiency and safety of wireless charging power transmission , Reliability is difficult to guarantee, and problems such as magnetic concentration and magnetic conduction cannot be achieved, so as to achieve the effect of benefiting wireless charging efficiency, avoiding the decline of power transmission efficiency, and high magnetic permeability

Active Publication Date: 2020-03-24
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nanocrystalline magnetic isolation sheet is mainly made of multi-layer nanocrystalline monoliths pasted by double-sided adhesive. The double-sided adhesive is a polymer material with poor thermal conductivity. Since the adhesive layer is distributed between the nanocrystalline monoliths, it is greatly The thermal resistance of the entire magnetic isolation sheet is increased, thereby greatly reducing the heat dissipation capacity of the entire system, resulting in an excessively high temperature rise of the wireless charging system, affecting the power transmission efficiency of wireless charging, and at the same time it is difficult to guarantee the safety and reliability of the system
At the same time, since the adhesive layer is a non-magnetic material, it cannot play the role of magnetic accumulation and magnetic conduction, which further affects the charging efficiency of the system.

Method used

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  • High-thermal-conductivity composite magnetism isolating sheet for wireless charging receiving end and preparation method thereof
  • High-thermal-conductivity composite magnetism isolating sheet for wireless charging receiving end and preparation method thereof
  • High-thermal-conductivity composite magnetism isolating sheet for wireless charging receiving end and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The composition of nanocrystalline flakes is 1K107B, that is, Fe 73.5 Si 13.5 B 9 Nb 3 Cu 1 (percentage by weight), the thickness of the flakes is 20 μm, and the number of layers of nanocrystalline flakes is 4;

[0046] The composite material layer is composed of thermally conductive filler, magnetically conductive filler and adhesive.

[0047] The thermally conductive filler is a composite filler of aluminum nitride and boron nitride, and the average particle size of the powder is 31nm and 69nm respectively.

[0048] The magnetically conductive filler is Fe 85 Si 9.6 Al 5.4 , the dimension in the thickness direction is 0.95 μm, and the aspect ratio is 103.

[0049] The binder is polyurethane.

[0050] The number of composite material layers is 3, and the thickness of the composite material layer is 10 μm. The weight percentages of thermally conductive fillers, magnetically conductive fillers, and binders are as follows:

[0051] Thermally conductive filler: ...

Embodiment 2

[0066] The composition of nanocrystalline flakes is 1K107B, that is, Fe 73.5 Si 13.5 B 9 Nb 3 Cu 1 (percentage by weight), the thickness of the flakes is 18 μm, and the number of layers of nanocrystalline flakes is 4;

[0067] The composite material layer is composed of thermally conductive filler, magnetically conductive filler and adhesive.

[0068] The thermally conductive filler is a composite filler of boron nitride and aluminum oxide, and the average particle size of the powder is 31nm and 80nm respectively.

[0069] The magnetically conductive filler is Fe 50 Ni 50 , the dimension in the thickness direction is 1.12 μm, and the aspect ratio is 110.

[0070] The binder is polyurethane.

[0071] The number of composite material layers is 3, and the thickness of the composite material layer is 8 μm. The weight percentages of thermally conductive fillers, magnetically conductive fillers, and binders are as follows:

[0072] Thermally conductive filler: 40%;

[007...

Embodiment 3

[0087] The composition of nanocrystalline flakes is 1K107B, that is, Fe 73.5 Si 13.5 B 9 Nb 3 Cu 1 (percentage by weight), the thickness of the flakes is 25 μm, and the number of layers of nanocrystalline flakes is 3;

[0088] The composite material layer is composed of thermally conductive filler, magnetically conductive filler and adhesive.

[0089] The thermally conductive filler is a composite filler of aluminum nitride and aluminum oxide, and the average particle size of the powder is 80nm and 30nm respectively.

[0090] The magnetically conductive filler is Fe 50 Ni 50 , the dimension in the thickness direction is 0.8 μm, and the aspect ratio is 95.

[0091] The binder is polyurethane.

[0092] The number of composite material layers is 2, and the thickness of the composite material layer is 15 μm. The weight percentages of thermally conductive fillers, magnetically conductive fillers, and binders are as follows:

[0093] Thermally conductive filler: 15%;

[0...

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Abstract

The invention belongs to the technical field of wireless charging, and discloses a high-thermal-conductivity composite magnetism isolating sheet for a wireless charging receiving end and a preparationmethod of the high-thermal-conductivity composite magnetism isolating sheet. The composite magnetism isolating sheet for the high-thermal-conductivity wireless charging receiving end is a composite material formed by alternately compounding nanocrystalline sheets and a composite material layer, and the composite material layer comprises a thermal conductive filler, a magnetic conductive filler and a binder. According to the preparation method, the surface of the magnetic conductive powder is uniformly coated with the heat conductive powder, so that the electrical conductivity of the magneticpowder can be effectively reduced. And meanwhile, even if the composite magnetic powder has a bridging phenomenon in the composite material layer, the heat conductive powder with excellent insulativity on the surface of the magnetic powder can play a certain role in isolation, so that the resistivity of the composite layer is greatly improved, and the improvement of the charging efficiency of thesystem is facilitated.

Description

technical field [0001] The invention relates to the technical field of wireless charging, in particular to a composite magnetic isolation sheet for a high thermal conductivity wireless charging receiving end and a preparation method thereof. Background technique [0002] With the rapid development of electronic information technology, consumer electronic products are developing in the direction of miniaturization and intelligence. As a new type of charging technology, wireless charging technology has brought a lot of convenience to users and is gradually becoming a standard configuration of electronic products, especially smart phones. [0003] At present, the mobile phone wireless charging system mainly adopts the Qi standard, and the application frequency is 100kHz-200kHz. The wireless charging system is mainly composed of an excitation coil and a magnetic isolation material. Due to the narrow design space of the mobile phone receiving end, the magnetic isolation material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/22H01F27/24H01F27/245H01F27/255H01F27/36H01F38/14H01F41/00H01F41/02
CPCH01F27/22H01F27/24H01F27/245H01F27/255H01F27/36H01F38/14H01F41/00H01F41/0233
Inventor 刘立东朱航飞单震刘阳阳
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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