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Nanocrystalline magnetic conductive sheet for high-power wireless charging and production method thereof

A wireless charging and nanocrystal technology, applied in nanostructure applications, electric vehicle charging technology, circuits, etc., can solve the problems of magnetic sheet anti-saturation performance degradation, effective magnetic sheet quality degradation, and nanocrystal shedding, etc., to achieve high power Unique magnetic sheet design, improved charging power range, and improved anti-saturation performance

Active Publication Date: 2021-08-20
SHENZHEN YN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This scheme has the following disadvantages: 1. The protective film affects the appearance and performance
The protective film needs to be torn off after the crushing process, which will take away the broken nanocrystal fragments, causing the nanocrystals to fall off, resulting in bump defects in appearance and performance degradation
The reason for the decline in performance is that the flatness of the nanocrystals is destroyed, resulting in a decrease in magnetic permeability, and at the same time, the shedding of nanocrystal fragments leads to a decline in the quality of the effective magnetic sheet, which in turn reduces the performance
2. Thickness
Obviously, the thickness of this patent has seriously failed to meet the application requirements of high-power magnetic isolation sheets
3. Cannot support high power
But larger gaps mean that the magnetic permeability of the nanocrystals drops significantly
In fact, the decrease in magnetic permeability caused by the large gap will cause a decrease in the anti-saturation performance of the magnetic sheet, and thus cannot realize high-power wireless charging.

Method used

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  • Nanocrystalline magnetic conductive sheet for high-power wireless charging and production method thereof
  • Nanocrystalline magnetic conductive sheet for high-power wireless charging and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Change the composition to Fe bal .Cu 1 Nb 2.9 Si 15.1 B 7 (at.%) alloy is prepared into an alloy thin strip whose initial state is amorphous by single-roller rapid quenching method. 531°C.

[0039] (2) Anneal the amorphous alloy strip in step (1) according to the following heat treatment process: (1) heat up to 475°C at a rate of 4°C per minute, keep it at this temperature for 60min, and then heat it at 3°C ​​per minute The speed is raised to 565°C, and then the temperature is lowered to below 200°C after 120 minutes of heat preservation. The saturation magnetic induction of the nanocrystalline ribbon after annealing is B s = 1.25T.

[0040] (3) The single-layer nanocrystalline strip after annealing is superimposed in two layers, and the two layers are bonded and fixed by double-sided adhesive tape. The outermost layer is protected by a double-sided adhesive coating process. It is single-sided tape, and the thickness of both double-sided tape and single-side...

Embodiment 2

[0042] (1) Change the composition to Fe bal .Cu 1 Nb 2 Si 14 B 7.5 (at.%) alloy is prepared into an alloy thin strip whose initial state is amorphous by single-roller rapid quenching method. 508°C.

[0043] (2) Anneal the amorphous alloy strip in step (1) according to the following heat treatment process: heat up to 460°C at a rate of 3°C per minute, keep at this temperature for 60min (pretreatment), and then heat it up at a rate of 2°C per minute The temperature is raised to 560°C at a rate of °C, and then kept for 120 minutes (crystallization treatment), and then cooled to below 200°C and released from the furnace. The saturation magnetic induction of the nanocrystalline ribbon after annealing is B s = 1.35T.

[0044] (3) The single-layer nanocrystalline strip after annealing is protected by a double-sided adhesive coating process, both sides are double-sided adhesive, and the thickness of the double-sided adhesive is 3 μm. The double-sided glue-coated single-layer n...

Embodiment 3

[0046] (1) Change the composition to Fe bal .Cu 0.9 Nb 1.8 Si 12 B 7 (at.%) alloy is prepared into an alloy thin strip whose initial state is amorphous by a single-roller rapid quenching method. 485°C.

[0047] (2) Anneal the amorphous alloy strip in step (1) according to the following heat treatment process: (1) heat up to 445°C at a rate of 3°C per minute, keep at this temperature for 60min, and then heat it at 2°C per minute The speed is raised to 555°C, and then the temperature is lowered to below 200°C after 120 minutes of heat preservation. The saturation magnetic induction of the nanocrystalline ribbon after annealing is B s = 1.45T.

[0048] (3) The single-layer nanocrystalline strip after annealing is superimposed in two layers, and the two layers are bonded and fixed by double-sided adhesive tape. The outermost layer is protected by a double-sided adhesive coating process. It is single-sided tape, and the thickness of both double-sided tape and single-sided t...

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Abstract

The invention belongs to the field of wireless charging materials, and discloses a nanocrystalline magnetic conductive sheet for high-power wireless charging and a production method thereof. The nanocrystalline magnetic conductive sheet is composed of Fe (100-x-y-z-alpha-beta-gamma) MxCuyM'zSi alpha B beta X gamma, and the saturation flux density Bs is larger than or equal to 1.25 T. The production method comprises the following steps: preparing an alloy with set components into an amorphous alloy ribbon, then carrying out set annealing treatment to obtain a nanocrystalline ribbon, and then carrying out magnetic crushing treatment to obtain the nanocrystalline magnetic conductive sheet for high-power wireless charging. According to the invention, through two times of set crystallization annealing treatment and further combination of double-sided coating protection, crushing and compounding processes, the obtained nanocrystalline magnetic conductive sheet product can be applied to a high-power wireless charging occasion, and the performance of a wireless charging module is greatly improved.

Description

technical field [0001] The invention belongs to the field of wireless charging materials, and in particular relates to a nanocrystalline magnetically conductive sheet for high-power wireless charging and a preparation method thereof. Background technique [0002] In recent years, with the popularization of wireless charging technology (Wireless Power Charging, WPC) in the field of consumer electronics, especially mobile phones, more and more mobile phone products have begun to be equipped with this function as standard, and the mobile phone wireless charging receiver module needs Using magnetic shielding materials, nanocrystalline magnetically permeable sheets are currently the mainstream magnetic shielding material solutions for mobile phone wireless charging receivers due to their excellent soft magnetic properties and ultra-thin thickness. Mainstream brand mobile phones such as Apple, Samsung and Huawei all use nanocrystalline magnetic permeable sheets as their magnetic s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F3/02H01F41/30
CPCH01F3/02H01F41/30Y02T90/14C22C45/02H01F27/366H02J50/70H01F1/15333H01F41/024H01F1/15341H01F1/15308H01F27/36H05K9/0075C21D8/1272H02J50/10
Inventor 李准王湘粤张华马春博李豪滨曾志超
Owner SHENZHEN YN TECH CO LTD
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