Heat-dissipating magnetic conductive sheet for wireless char and preparation method thereof

A wireless charging and heat dissipation technology, applied in the manufacture of inductors/transformers/magnets, preventing/reducing unwanted electric/magnetic influences, circuits, etc., can solve the problem of affecting the normal use of the magnetic sheet and increasing the overall thickness of the magnetic sheet , Not suitable for electronic products with relatively small volume, etc., to achieve the effect of improving shielding performance, reducing the loss of charging efficiency, and reducing the overall thickness

Active Publication Date: 2019-11-05
DONGGUAN HONGYI THERMAL CONDUCTMTY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above technical solutions have reduced the eddy current to some extent and improved the charging efficiency, there are still problems. For example, during the charging process, the magnetic conductive sheet is prone to generate eddy current heating in the magnetic field. Affect the normal use of the magnetic sheet
At present, in order to solve the problem of heat dissipation, heat dissipation materials such as graphite sheet or copper foil are pasted on the magnetic conductive sheet with double-sided adhesive tape. Although this solves the heat dissipation problem of the magnetic conductive sheet to a certain extent, it will increase the The overall thickness of the chip is not suitable for electronic products with relatively small volume

Method used

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  • Heat-dissipating magnetic conductive sheet for wireless char and preparation method thereof
  • Heat-dissipating magnetic conductive sheet for wireless char and preparation method thereof
  • Heat-dissipating magnetic conductive sheet for wireless char and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Preparation of heat-dissipating magnetic sheet for wireless charging:

[0036] 1) Take an iron-based amorphous material with a thickness of 0.01mm, and crack it to form a plurality of amorphous fragment units with a size of 0.5mm, and a gap is formed between two adjacent amorphous fragment units;

[0037] 2) According to the mass ratio, dissolve 30% epoxy resin and 15% acrylic resin in acetone solvent, then add 52% magnesium oxide and 3% m-phenylenediamine, and stir evenly to obtain an insulating and thermally conductive glue ;

[0038] 3) Immerse the cracked iron-based amorphous material in the insulating heat-conducting adhesive solution for 0.1s, then take it out and dry it for semi-curing, and form a semi-cured thickness of 0.02mm insulating and thermally conductive adhesive layer;

[0039] 4) Take a copper foil with a thickness of 0.02mm, and spray or deposit a graphite layer with a thickness of 0.01mm on any surface thereof;

[0040] 5) The side of the copper f...

Embodiment 2

[0042] Preparation of heat-dissipating magnetic sheet for wireless charging:

[0043] 1) Take an iron-based nanocrystalline sheet material with a thickness of 0.05mm, and crack it to form a plurality of nanocrystalline fragment units with a size of 2mm, and a gap is formed between two adjacent nanocrystalline fragment units;

[0044] 2) According to the mass ratio, dissolve 35% epoxy resin and 15% nitrile rubber in acetone solvent, then add 40% beryllium oxide and 10% m-phenylenediamine, and stir evenly to obtain an insulating heat-conducting glue ;

[0045] 3) Immerse the cracked iron-based nanocrystal sheet into the insulating heat-conducting adhesive for 1 second, then take it out and dry it, and perform semi-curing, forming a semi-cured thickness of 0.03 in the gap and the surface of the nanocrystalline fragment unit. mm insulation and heat conduction adhesive layer;

[0046] 4) Take a copper foil with a thickness of 0.1mm, and spray or deposit a graphite layer with a th...

Embodiment 3

[0049] Preparation of heat-dissipating magnetic sheet for wireless charging:

[0050] 1) Take a cobalt-based nanocrystalline sheet material with a thickness of 0.1 mm, and crack it to form a plurality of nanocrystalline fragment units with a size of 5 mm, and a gap is formed between two adjacent nanocrystalline fragment units;

[0051] 2) Dissolve 25% epoxy resin, 10% polyamideimide resin and 10% acrylic rubber in acetone solvent by mass ratio, then add 30% aluminum oxide, 20% silicon carbide and 5% m-phenylenediamine, stirred evenly to obtain insulating heat-conducting glue;

[0052] 3) Immerse the cracked cobalt-based nanocrystal sheet into the insulating heat-conducting adhesive for 5 seconds, then take it out and dry it, and perform semi-curing, forming a semi-cured thickness of 0.05 mm in the gaps and on the surface of the nanocrystalline fragment unit. mm insulation and heat conduction adhesive layer;

[0053] 4) Take a copper foil with a thickness of 0.2mm, and spray ...

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Abstract

The invention belongs to the technical field of wireless charging components, in particular to a heat-dissipating magnetic conductive sheet for wireless charging. The heat-dissipating magnetic conductive sheet comprises a magnetic conductive substrate, an insulating heat conductive adhesive layer, a graphite layer and a copper foil. The magnetic conductive substrate is composed of a plurality of amorphous or nanocrystalline fragment units. A gap is formed between two adjacent amorphous or nanocrystalline fragment units. The insulating heat conductive adhesive layer is arranged in the gap and on the surface of the amorphous or nanocrystalline fragment units. The graphite layer is arranged between the insulating heat conductive adhesive layer and the copper foil. Compared with the sheets inthe prior art, the heat-dissipating magnetic conductive sheet has good shielding performance and heat dissipation performance. In addition, the invention also provides a preparation method of the heat-dissipating magnetic conductive sheet for wireless charging.

Description

technical field [0001] The invention belongs to the technical field of wireless charging components, in particular to a heat dissipation type magnetic conductive sheet for wireless charging and a preparation method thereof. Background technique [0002] For consumer electronic products, wireless charging has the advantages of convenient operation and strong versatility. Wireless charging technology, also known as non-contact charging, realizes wireless charging by means of battery induction or frequency resonance generated by coils arranged on both sides of the transmitting end and receiving end. Among them, there are usually metal parts such as batteries near the coil at the receiving end. When wireless charging is performed through battery induction, eddy currents will be formed on the metal parts. In order to shield these interferences, it is usually necessary to paste a magnetic conductive sheet on the back of the coil at the receiving end. [0003] Patent CN104011814B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/36H01F27/34H01F27/22H01F38/14H01F41/02H02J50/70
CPCH01F27/36H01F27/34H01F27/22H01F38/14H01F41/02H02J50/70H01F2027/348
Inventor 朱全红
Owner DONGGUAN HONGYI THERMAL CONDUCTMTY MATERIAL CO LTD
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