CN116168930A - Nanocrystalline magnetic isolation sheet for wireless charging and preparation method thereof - Google Patents
Nanocrystalline magnetic isolation sheet for wireless charging and preparation method thereof Download PDFInfo
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- CN116168930A CN116168930A CN202111408862.4A CN202111408862A CN116168930A CN 116168930 A CN116168930 A CN 116168930A CN 202111408862 A CN202111408862 A CN 202111408862A CN 116168930 A CN116168930 A CN 116168930A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/25—Magnetic cores made from strips or ribbons
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/22—Cooling by heat conduction through solid or powdered fillings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/263—Fastening parts of the core together
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The application provides a nanocrystalline magnetism isolating sheet for wireless charging and a preparation method thereof. The nanocrystalline magnetic isolation sheet for wireless charging comprises a plurality of nanocrystalline magnetic strips with the length of a, the width of b and the height of c, wherein a is more than b and equal to or more than c; the plurality of nanocrystalline magnetic strips are arranged at intervals of 0-10mm along a direction perpendicular to the length of the nanocrystalline magnetic strips. The assembly of the magnetic isolation sheet is formed by the nanocrystalline magnetic strip, so that eddy current loss is greatly reduced, heating in the charging process is reduced, and charging efficiency is improved.
Description
Technical Field
The application relates to the application fields of radio transmission and electromagnetic shielding, in particular to a nanocrystalline magnetic isolation sheet for wireless charging and a preparation method thereof.
Background
The wireless charging technology can realize the electrical isolation between the power supply and the load, has the characteristics of convenience, flexibility, safety and reliability, is widely focused in recent years, and is applied to consumer electronics and gradually expands and applies to the fields of electric automobiles, intelligent home furnishings, robots and the like.
The magnetic conduction structure of the current wireless charging system is mainly formed by splicing square ferrite materials. The magnetic conductor made of the soft magnetic ferrite has higher resistivity, can inhibit vortex, can be applied to the high-frequency field, and has the characteristics of stable chemical characteristics, customizable shape and size and the like. However, the disadvantage of the soft magnetic ferrite magnetic conductor is the low saturation magnetic flux density, which directly results in a large size, high weight of the power coupling mechanism of the high power wireless charging system, and the whole device is very heavy. Secondly, the blocky sintered ferrite material is brittle, is not suitable for a wireless charging environment of a mobile vehicle, and can lead to material fragmentation after long-term vibration. All the above factors lead to poor working effects of the ferrite material in the process of strong electromagnetic coupling.
In recent years, research into wireless charging applications of amorphous ribbons has been initiated. The existing process method for preparing the magnetic field shielding sheet for wireless charging by using the amorphous strip comprises a lamination method and a dipping method. The lamination method is to apply protective films or adhesive tapes on the upper and lower surfaces of a single magnetic sheet, and crush the protective films or adhesive tapes to obtain the magnetic field isolating sheet for wireless charging. Although the magnetic field shielding sheet can be obtained by the above-mentioned process, the above-mentioned process has disadvantages of being unable to continuously produce and complicated in process. In addition, the upper surface and the lower surface of the magnetic sheet are adhered with adhesive films, so that the magnetic sheet is not easy to crack. In addition, although the lamination method presses the glue into the chip gaps, the reliability is not high and the insulation effect is not ideal.
The gum dipping method fills gum solution into the strip cracks through single-sided gum dipping, ensures that the cracks are completely filled, and simultaneously coats all exposed areas of the tiny units of the amorphous or nanocrystalline thin sheet, so that the amorphous or nanocrystalline thin sheet is insulated from each other, and eddy current loss is reduced. However, the process has the defects of complicated working procedures and thicker film after gum dipping. In addition, the glue solution enters the gap between fragments in a soaking mode, and the defects of low reliability and unsatisfactory insulating effect exist, and the loss of the treated nanocrystalline magnetic sheet under high power is relatively high compared with ferrite.
In addition, the existing magnetic field shielding sheet for wireless charging is prepared by arranging amorphous or nanocrystalline magnetic sheets obtained by the two methods in a tiling mode and packaging the amorphous or nanocrystalline magnetic sheets. However, the magnetic field shielding sheet manufactured in a tiling mode can generate eddy current loss in the wireless charging process, so that heating is serious, and the charging efficiency is reduced.
Disclosure of Invention
In order to solve the problem of eddy current loss of the magnetic isolation sheet in the prior art, one of the purposes of the application is to provide a nanocrystalline magnetic isolation sheet for wireless charging.
The nanocrystalline magnetic isolation sheet for wireless charging comprises a plurality of nanocrystalline magnetic strips with the length a, the width b and the height c, wherein a is more than b and equal to c; the plurality of nanocrystalline magnetic strips are arranged at intervals of 0-10mm along the length direction perpendicular to the nanocrystalline magnetic strips.
Further, the width and height of the nanocrystalline magnetic stripe range is: b is more than 0 and less than 5mm, c is more than 0 and less than 5mm.
In the specific embodiment provided by the application, a heat dissipation layer is arranged between the nanocrystalline magnetic strips, and the heat dissipation layer comprises a heat conduction material, a magnetic conduction material and an adhesive.
Further, the heat dissipation layers and the nanocrystalline magnetic strips are alternately arranged, or a plurality of nanocrystalline magnetic strips are overlapped in the direction perpendicular to the length direction without gaps to form nanocrystalline magnetic strip overlapped bodies, and the heat dissipation layers are arranged between the adjacent nanocrystalline magnetic strip overlapped bodies.
Further, when the heat dissipation layer and the nanocrystalline magnetic stripe are alternately arranged, the pitch between the plurality of nanocrystalline magnetic stripes is 3-5mm, preferably, the pitch between the plurality of nanocrystalline magnetic stripes is 4mm. When a plurality of nanocrystalline magnetic strips form a nanocrystalline magnetic strip laminate, the spacing between adjacent nanocrystalline magnetic strip laminates is 0-10mm, preferably 3-5mm, more preferably 4mm.
The other aspect of the application provides a method for preparing a nanocrystalline magnetic isolation sheet for wireless charging, which comprises the steps of sticking insulating tapes on two sides of a nanocrystalline base strip, performing splitting treatment to obtain nanocrystalline strips with required magnetic permeability, and bonding the nanocrystalline strips to obtain a multilayer nanocrystalline strip; cutting the multilayer nanocrystalline strip into preset sizes to form a nanocrystalline magnetic strip with a length a, a width b and a height c, wherein a is more than b and equal to c; arranging a plurality of nanocrystalline magnetic strips at intervals of 0-10mm along the direction perpendicular to the length of the nanocrystalline magnetic strips; and performing packaging treatment to form the nanocrystalline magnetic isolation sheet for wireless charging.
Further, the plurality of nanocrystalline magnetic strips are arranged in a seamless mode, namely surfaces of the nanocrystalline magnetic strips formed by the length a and the height c are used as bonding surfaces, and adjacent nanocrystalline magnetic strips are bonded by bonding surfaces in pairs to form gapless arrangement.
Further, in the preparation method provided by the application, a heat dissipation layer is coated between the joint surfaces formed by the length a and the height c of the nanocrystalline magnetic stripe, and the nanocrystalline magnetic stripe and the heat dissipation layer are arranged at intervals along the direction perpendicular to the length of the nanocrystalline magnetic stripe.
Further, a heat dissipation layer is directly coated between two adjacent bonding surfaces, so that alternative arrangement of the nanocrystalline magnetic strips and the heat dissipation layer is formed; or a plurality of nanocrystalline magnetic strips are arranged without gaps to form nanocrystalline magnetic strip superposed bodies, heat dissipation layers are coated between adjacent nanocrystalline magnetic strip superposed bodies, and the nanocrystalline magnetic strip superposed bodies and the heat dissipation layers are alternately arranged, so that the interval arrangement between the nanocrystalline magnetic strips and the heat dissipation layers is implemented.
Through the wireless magnetism isolating sheet for charging that this application provided, the nanocrystalline magnetic stripe of strip structure is arranged along the direction of perpendicular to length, has realized wireless purpose that the magnetism isolating sheet single subassembly surface area used for charging descends by a wide margin, and then has reduced eddy current loss, has reduced the heating in the charging process, has improved charging efficiency.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail with reference to examples.
In order to achieve the above purpose, the present application provides a nanocrystalline magnetic separation sheet for wireless charging, which includes a plurality of nanocrystalline magnetic strips with a length a, a width b, and a height c, wherein a > b is greater than or equal to c; the plurality of nanocrystalline magnetic strips are arranged at intervals of 0-10mm along a direction perpendicular to the length of the nanocrystalline magnetic strips. Different from the mode that prior art will nanocrystalline magnetic sheet tiling be arranged, nanocrystalline magnetism isolating sheet that this application provided arranges the nanocrystalline magnetic stripe of banding along the direction of perpendicular to length. By the arrangement, the surface area of a single component forming the magnetic isolation sheet for wireless charging is greatly reduced, the problems of eddy current loss and heating are solved, and thus the charging efficiency is improved.
In the specific embodiments provided herein, the width and height ranges of the nanocrystalline magnetic stripe are: b is more than 0 and less than 5mm, c is more than 0 and less than 5mm. The width is within the range, so that the process for preparing the magnetic stripe is more favorable for the industrialized production of the nanocrystalline magnetic isolation sheet, and the prepared nanocrystalline magnetic isolation sheet has more reasonable magnetic stripe spacing and more excellent heat dissipation performance. The height is in the range, so that the volume and the weight of the nanocrystalline magnetic isolation sheet are kept in a certain range, and the nanocrystalline magnetic isolation sheet is more suitable for loading of a vehicle-mounted end.
The nanocrystalline magnetic strips in the nanocrystalline magnetic isolation sheet provided by the application are arranged at intervals of 0-10mm, preferably, the intervals between the nanocrystalline magnetic strips are 3-5mm, and most preferably, 4mm. The distance between the nanocrystalline magnetic strips is within the range, and the best balance between magnetic leakage and heat dissipation performance can be obtained. When the distance exceeds 10mm, magnetic leakage phenomenon occurs, and the charging efficiency is seriously affected. Particularly in the optimal embodiment provided by the application, the interval between the nanocrystalline magnetic strips is 4mm, and under the interval, the charging efficiency of the prepared nanocrystalline magnetic isolation strip is highest, and the eddy current loss is minimum. Moreover, in the preferred embodiment provided herein, the spacing between the nanocrystalline magnetic strips is kept uniform, and the nanocrystalline magnetic strips are disposed at equal spacing. The nanocrystalline magnetic isolation sheet obtained by equidistant arrangement has uniform magnetic field and uniform surface heat dissipation, thereby showing more excellent charging performance.
Furthermore, the application provides a specific embodiment for arranging a heat dissipation layer between the nanocrystalline magnetic strips. The heat dissipation layer can improve the heat dissipation performance of the magnetic isolation sheet in the charging process, and the distance between the magnetic strips can be adjusted to be more than 0mm and less than 10 mm. The heat dissipation layer comprises a heat conduction material, a magnetic conduction material and an adhesive. In the embodiment of the application, two heat dissipation layers are arranged, one is that the heat dissipation layers and the nanocrystalline magnetic strips are alternately arranged, and the heat dissipation layers are arranged between every two adjacent nanocrystalline magnetic strips; in another mode, a plurality of nanocrystalline magnetic strips are bonded without gaps to form nanocrystalline magnetic strip overlapped bodies, and then a heat dissipation layer is arranged between the adjacent nanocrystalline magnetic strip overlapped bodies. In a preferred embodiment provided herein, the nanocrystalline magnetic stripe laminates are disposed at equal intervals. The nanocrystalline magnetic isolation sheet obtained by equidistant arrangement has uniform magnetic field and uniform surface heat dissipation, thereby showing more excellent charging performance. Of course, the application is not limited to the specific implementation mode of arranging the heat dissipation layer and the heat dissipation layer, and all the arrangement modes which can be used for adjusting and controlling the magnetic stripe distance and improving the heat dissipation performance are within the protection scope of the application.
When the heat dissipation layer and the nanocrystalline magnetic stripe are alternately arranged, the pitch between the plurality of nanocrystalline magnetic stripes is 3-5mm, preferably, the pitch between the plurality of nanocrystalline magnetic stripes is 4mm. When a plurality of nanocrystalline magnetic strips form a nanocrystalline magnetic strip laminate, the spacing between adjacent nanocrystalline magnetic strip laminates is 0-10mm, preferably 3-5mm, more preferably 4mm. The distance between the nanocrystalline magnetic strips is within the range, so that better balance between magnetic leakage and heat dissipation performance can be obtained.
In another aspect of the application, a method for preparing a nanocrystalline magnetic separator sheet for wireless charging is provided. The method comprises the following steps: pasting insulating tapes on two sides of the nanocrystalline base strip, performing splitting treatment to obtain nanocrystalline strips with required magnetic permeability, and bonding the nanocrystalline strips to obtain a multilayer nanocrystalline strip; cutting the multilayer nanocrystalline strip into preset sizes to form a nanocrystalline magnetic strip with a length a, a width b and a height c, wherein a is more than b and equal to c; arranging a plurality of nanocrystalline magnetic strips at intervals of 0-10mm along the direction perpendicular to the length of the nanocrystalline magnetic strips; and performing packaging treatment to form the nanocrystalline magnetic isolation sheet for wireless charging. The nanocrystalline strip after the splitting treatment forms tiny crystals, and can effectively reduce the electronic vortex; in addition, the nanocrystalline magnetic strip is used as the minimum component of the magnetic isolation sheet, so that the surface area of the component is greatly reduced, and the problems of eddy current loss and heating are solved. In addition, the preparation method provided by the application does not need the steps of gum dipping, gum pressing and the like, has simple process and easy operation, and is suitable for industrial mass production.
The permeability of the nanocrystalline strip treated by the splitting process is 200-20000, preferably 8000-10000. The magnetic permeability of the nanocrystalline strip is preferably within the above range, and particularly the magnetic permeability is preferably 8000-10000, and the charging efficiency improvement effect is most obvious in this range.
The application provides a nanocrystalline magnetic stripe seamless arrangement mode, and an implementation method thereof is to form gapless arrangement by bonding surfaces (surfaces formed by length a and height c) of adjacent nanocrystalline magnetic stripes in pairs. The upper surface and the lower surface of the nanocrystalline magnetic stripe are both provided with double faced adhesive tapes, so that the automatic lamination of the nanocrystalline magnetic stripe can be realized by directly utilizing the magnetic stripe lamination device without dipping and laminating, and manual lamination is not required, thereby being very suitable for industrial production.
In the technical scheme provided by the application, the step of overlapping the nanocrystalline magnetic strips further comprises the step of arranging a heat dissipation layer between the nanocrystalline magnetic strips. The method for adding the heat dissipation layer comprises the steps of directly smearing a composite material containing a heat conduction material, a magnetic conduction material and an adhesive on the nanocrystalline magnetic strip (coating the adhesive surface formed by the length a and the height c), and forming a structure in which the nanocrystalline magnetic strip and the heat dissipation layer are alternately arranged by utilizing the adhesive nanocrystalline magnetic strip of the composite material. The nanocrystalline magnetic strips can be bonded in a gapless manner to form nanocrystalline magnetic strip laminates, and then a heat dissipation layer containing a heat conduction material, a magnetic conduction material and an adhesive is smeared between the adjacent nanocrystalline magnetic strip laminates.
The usable heat conducting material is nonmetal nano powder with better insulativity, and preferably, the heat conducting material can be one or more of metal oxide powder, carbide powder and nitride powder; the magnetic conductive material is one or more of soft magnetic alloy magnetic powder of Fe-Si, fe-Si-Al, fe-Ni-Mo and Fe-Si-Cr. The adhesive can be one or more of epoxy resin, polyurethane, phenolic resin, acrylic resin, urea-formaldehyde resin, nitrile rubber, chloroprene rubber and synthetic rubber. The materials are mixed in a certain proportion to prepare the composite material, and the heat dissipation layer is formed. Wherein the proportion of the substances can be that the weight ratio of the heat conducting material to the magnetic conducting material to the adhesive is 15-40:25-50:15-65. Besides the heat-conducting material forming the heat-radiating layer, the heat-radiating layer can be arranged by adopting common heat-conducting glue or heat-conducting film.
The application provides examples 1-8, and compares with the existing tiled ferrite (DMR 95 ferrite, commercially available product) and the tiled nanocrystalline magnetic separator sheet (MS 700 nanocrystalline, commercially available product), further proving the beneficial effects of the nanocrystalline magnetic separator sheet provided by the application.
Example 1: the nanocrystalline base strip is stuck with an insulating tape, then the base strip is subjected to splitting treatment to obtain nanocrystalline strip with magnetic conductivity of 700, 72 layers of the treated nanocrystalline strip are adhered to obtain 72 layers of nanocrystalline strip, and then the strip after lamination is cut to form nanocrystalline magnetic strips with the following dimensions: 390mm by 3mm. And finally, bonding the cut nanocrystalline magnetic strips (the surfaces formed by the long a and the high c) one by one with a gap of 0mm to obtain a nanocrystalline magnetic strip overlapped body, and packaging to obtain the nanocrystalline magnetic isolation sheet. In order to obtain experimental data conveniently, in the embodiment provided by the application, the above laminated body is directly vertically arranged on the magnetic isolation plate for experiment, and the encapsulation treatment is not performed. The magnetic isolation plate is placed into a high-power wireless charging device to test the charging efficiency and the heating condition, and the following data are obtained:
| high-power wireless charging magnetism isolating material | Thickness (mm) |
| DMR95 ferrite (tiling) | 5 |
| 3-layer MS700 nanocrystalline (tiling) | 2.4 |
| Example 1 | 3 |
According to the experimental result obtained in the embodiment 1, it is easy to see that the nanocrystalline magnetic isolation sheet with the magnetic stripe structure provided by the application has improved charging efficiency compared with that of the DMR95 ferrite and the 3-layer MS700 nanocrystalline, but the heating condition is obviously lower than that of the 3-layer MS700 nanocrystalline.
Example 2: the nanocrystalline base strip is stuck with an insulating tape, then the base strip is subjected to splitting treatment to obtain nanocrystalline strip with magnetic conductivity of 10000, 72 layers of the treated nanocrystalline strip are adhered to obtain 72 layers of nanocrystalline strip, and then the strip after lamination is cut into the following dimensions: 390mm by 3mm. Finally, the cut nanocrystalline magnetic strips (the surfaces formed by the length and the height) are bonded one by one with a gap of 0mm to obtain a nanocrystalline magnetic strip laminated body, and the laminated body is vertically arranged on the magnetic isolation plate. Putting the magnetism isolating plate into a high-power wireless charging device to test charging efficiency and heating condition, and obtaining the following data:
according to the experimental result obtained in the embodiment 2, it is easy to see that the nanocrystalline magnetic isolation sheet with the magnetic stripe structure provided by the application has improved charging efficiency compared with that of the DMR95 ferrite and the 3-layer MS700 nanocrystalline, but the heating condition is obviously lower than that of the 3-layer MS700 nanocrystalline. And compared with the embodiment 1, the charging efficiency is improved because the nanocrystalline magnetic strip with higher magnetic permeability (10000) is adopted.
Example 3: the nanocrystalline base strip is stuck with an insulating tape, then the base strip is subjected to splitting treatment to obtain nanocrystalline strip with magnetic conductivity of 700, 72 layers of the treated nanocrystalline strip are adhered to obtain 72 layers of nanocrystalline strip, and then the strip after lamination is cut into the following dimensions: 390mm by 5mm by 3mm. Finally, the cut nanocrystalline magnetic strips (the surfaces formed by the length and the height) are bonded one by one with a gap of 3mm. The step of forming the bonding comprises the steps of forming a heat dissipation material by the heat conduction material, the magnetic conduction material and the bonding agent according to the proportion of 15:25:65, and smearing the composite material on the nanocrystalline magnetic strip, so that the nanocrystalline magnetic strip and the heat dissipation layer are alternately arranged. And placing the superposed body which is alternately arranged with the heat dissipation layers on the magnetic isolation plate. The magnetic isolation plate is placed into a high-power wireless charging device to test the charging efficiency and the heating condition, and the following data are obtained:
| high-power wireless charging magnetism isolating material | Thickness (mm) |
| DMR95 ferrite (tiling) | 5 |
| 3-layer MS700 nanocrystalline (tiling) | 2.4 |
| Example 3 | 3 |
According to the experimental result obtained in the embodiment 3, it is easy to see that the nanocrystalline magnetic isolation sheet with the magnetic stripe structure provided by the application has improved charging efficiency compared with that of the DMR95 ferrite and the 3-layer MS700 nanocrystalline, the impedance is obviously smaller than that of the DMR95 ferrite, and the heating condition is obviously lower than that of the 3-layer MS700 nanocrystalline. Also, the heat generation of example 3 is significantly improved compared with examples 1 and 2 because the heat dissipation layers are provided at intervals.
Example 4: the nanocrystalline base strip is stuck with an insulating tape, then the base strip is subjected to splitting treatment to obtain nanocrystalline strip with magnetic conductivity of 700, 72 layers of the treated nanocrystalline strip are adhered to obtain 72 layers of nanocrystalline strip, and then the strip after lamination is cut into the following dimensions: 390mm by 3mm by 5mm. Finally, coating heat dissipation materials on the cut nanocrystalline magnetic strips (the surfaces formed by the length and the height), bonding one by one with a gap of 4mm to obtain nanocrystalline magnetic strip superposed bodies, and vertically arranging the superposed bodies on the magnetic isolation plates. The magnetic isolation plate is placed into a high-power wireless charging device to test the charging efficiency and the heating condition, and the following data are obtained:
| high-power wireless charging magnetism isolating material | Thickness (mm) |
| DMR95 ferrite (tiling) | 5 |
| 3-layer MS700 nanocrystalline (tiling) | 2.4 |
| Example 4 | 5 |
According to the experimental result obtained in the embodiment 4, it is easy to see that the nanocrystalline magnetic isolation sheet with the magnetic stripe structure provided by the application has improved charging efficiency compared with that of the DMR95 ferrite and the 3-layer MS700 nanocrystalline, the impedance is obviously smaller than that of the DMR95 ferrite, and the heating condition is obviously better than that of the 3-layer MS700 nanocrystalline. And the heat generation is significantly improved compared with embodiments 1 and 2 because the heat dissipation layers are provided at intervals.
Example 5: the nanocrystalline base strip is stuck with an insulating tape, then the base strip is subjected to splitting treatment to obtain nanocrystalline strip with magnetic conductivity of 10000, 100 layers of the treated nanocrystalline strip are adhered to obtain 100 layers of nanocrystalline strip, and then the strip after lamination is cut into the following dimensions: 390mm by 3.8mm by 3.5mm. Finally, the cut nanocrystalline magnetic strips (the surfaces formed by the length and the height) are bonded one by one with a gap of 0mm to obtain a nanocrystalline magnetic strip laminated body, and the laminated body is vertically arranged on the magnetic isolation plate. The magnetic isolation plate is placed into a high-power wireless charging device to test the charging efficiency and the heating condition, and the following data are obtained:
| high-power wireless charging magnetism isolating material | Thickness (mm) |
| DMR95 ferrite (tiling) | 5 |
| 3-layer MS700 nanocrystalline (tiling) | 2.4 |
| Example 5 | 3.5 |
According to the experimental result obtained in the embodiment 5, it is easy to see that the nanocrystalline magnetic isolation sheet with the magnetic stripe structure provided by the application has improved charging efficiency compared with that of the DMR95 ferrite and the 3-layer MS700 nanocrystalline, the impedance is obviously smaller than that of the DMR95 ferrite, and the heating condition is obviously better than that of the 3-layer MS700 nanocrystalline.
Example 6: the nanocrystalline base strip is stuck with an insulating tape, then the base strip is subjected to splitting treatment to obtain nanocrystalline strip with magnetic conductivity of 5000, 72 layers of the treated nanocrystalline strip are adhered to obtain 72 layers of nanocrystalline strip, and then the strip after lamination is cut into the following dimensions: 390mm by 3mm. Finally, the cut nanocrystalline magnetic strips (the surfaces formed by the length and the height) are bonded one by one with a gap of 0mm to obtain a nanocrystalline magnetic strip laminated body, and the laminated body is vertically arranged on the magnetic isolation plate. The magnetic isolation plate is placed into a high-power wireless charging device to test the charging efficiency and the heating condition, and the following data are obtained:
according to the experimental result obtained in the embodiment 6, it is easy to see that the nanocrystalline magnetic isolation sheet with the magnetic stripe structure provided by the application has improved charging efficiency compared with that of the DMR95 ferrite and the 3-layer MS700 nanocrystalline, the impedance is obviously smaller than that of the DMR95 ferrite, and the heating condition is obviously better than that of the 3-layer MS700 nanocrystalline.
Example 7: the nanocrystalline base strip is stuck with an insulating tape, then the base strip is subjected to splitting treatment to obtain nanocrystalline strip with magnetic conductivity of 700, 72 layers of the treated nanocrystalline strip are adhered to obtain 72 layers of nanocrystalline strip, and then the strip after lamination is cut into the following dimensions: 390 mm. Times.1 mm. And bonding every 5 cut nanocrystalline magnetic strips (surfaces formed by long and high surfaces) one by one with a gap of 0mm to obtain the nanocrystalline magnetic strip overlapped body. And (3) coating heat dissipation materials (the heat dissipation materials used in the embodiment) among the laminated bodies, wherein the heat dissipation materials form heat dissipation layers with the thickness of 4mm, and the heat dissipation layers and the laminated bodies are alternately arranged along the length direction of the vertical nanocrystalline magnetic stripe. The laminated body thus prepared by stacking is vertically disposed on the magnetism insulator plate. The magnetic isolation plate is placed into a high-power wireless charging device to test the charging efficiency and the heating condition, and the following data are obtained:
| high-power wireless charging magnetism isolating material | Thickness (mm) |
| DMR95 ferrite (tiling) | 5 |
| 3-layer MS700 nanocrystalline (tiling) | 2.4 |
| Example 7 | 5 |
According to the experimental result obtained in the embodiment 7, it is easy to see that the nanocrystalline magnetic isolation sheet with the magnetic stripe structure provided by the application has improved charging efficiency compared with that of the DMR95 ferrite and the 3-layer MS700 nanocrystalline, the impedance is obviously smaller than that of the DMR95 ferrite, and the heating condition is obviously better than that of the 3-layer MS700 nanocrystalline. As in example 4, the heat dissipation layer was provided at intervals, and the heat generation was significantly improved.
Example 8: the nanocrystalline base strip is stuck with an insulating tape, then the base strip is subjected to splitting treatment to obtain nanocrystalline strip with magnetic conductivity of 15000, 72 layers of the treated nanocrystalline strip are adhered to obtain 72 layers of nanocrystalline strip, and then the strip after lamination is cut into the following dimensions: 390mm by 6mm. Finally, the cut nanocrystalline magnetic strips (the surfaces formed by the length and the height) are bonded one by one with a gap of 7 mm. The step of forming the bonding comprises the steps of forming a heat dissipation material by the heat conduction material, the magnetic conduction material and the bonding agent according to the proportion of 15:25:65, and smearing the composite material on the nanocrystalline magnetic strip, so that the nanocrystalline magnetic strip and the heat dissipation layer are alternately arranged. The stacked body which is alternately arranged with the heat dissipation layers is arranged on the magnetic isolation plate, the magnetic isolation plate is placed into a high-power wireless charging device to test the charging efficiency and the heating condition, and the following data are obtained:
| high-power wireless charging magnetism isolating material | Thickness (mm) |
| DMR95 ferrite (tiling) | 5 |
| 3-layer MS700 nanocrystalline (tiling) | 2.4 |
| Example 8 | 6 |
According to the experimental result obtained in the embodiment 8, it is easy to see that the nanocrystalline magnetic isolation sheet with the magnetic stripe structure provided by the application has improved charging efficiency compared with that of the DMR95 ferrite and the 3-layer MS700 nanocrystalline, the impedance is obviously smaller than that of the DMR95 ferrite, and the heating condition is obviously lower than that of the 3-layer MS700 nanocrystalline. Also, the heat generation of example 8 was significantly improved compared with examples 1 and 2 because the heat dissipation layers were provided at intervals. The charging efficiency is slightly reduced compared to other embodiments because the interval is relatively large.
In a word, the nanocrystalline magnetism isolating sheet that this application provided is because of it has changed traditional tiling mode, is piled up along the direction of perpendicular to magnetic stripe length by nanocrystalline magnetic stripe and forms, and then makes its charging efficiency compare in ferrite and nanocrystalline tiling mode to promote to some extent, and the condition of generating heat is obviously superior to the mode of current nanocrystalline tiling moreover.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. The utility model provides a wireless nanocrystalline magnetism isolating sheet for charging which characterized in that, nanocrystalline magnetism isolating sheet includes:
a plurality of nanocrystalline magnetic strips with the length of a, the width of b and the height of c, wherein a is more than b and equal to or more than c;
the plurality of nanocrystalline magnetic strips are arranged at intervals of 0-10mm along the direction perpendicular to the length of the nanocrystalline magnetic strips to form the nanocrystalline magnetic isolation sheet.
2. The nanocrystalline magnetically isolated sheet for wireless charging according to claim 1, wherein the nanocrystalline magnetic strip has a width and height ranging from: b is more than 0 and less than 5mm, c is more than 0 and less than 5mm.
3. The nanocrystalline magnetic separator sheet for wireless charging according to claim 1 or 2, wherein a heat dissipation layer is provided between the nanocrystalline magnetic strips, and the heat dissipation layer comprises a heat conductive material, a magnetic conductive material, and an adhesive.
4. The nanocrystalline magnetic separator sheet for wireless charging according to claim 3, wherein the nanocrystalline magnetic separator sheet includes a plurality of the heat dissipation layers, the heat dissipation layers being alternately arranged with the nanocrystalline magnetic stripe.
5. The nanocrystalline magnetically-isolated sheet for wireless charging according to any one of claims 1 to 4, wherein the pitch between the plurality of nanocrystalline magnetic strips is 3-5mm, preferably the pitch between the plurality of nanocrystalline magnetic strips is 4mm.
6. The nanocrystalline magnetic separator sheet for wireless charging according to claim 3, wherein a plurality of nanocrystalline magnetic strips are superimposed without gaps to form nanocrystalline magnetic strip superimposed bodies, and the heat dissipation layer is disposed between adjacent nanocrystalline magnetic strip superimposed bodies.
7. A method for preparing a nanocrystalline magnetic isolation sheet for wireless charging is characterized in that,
pasting insulating tapes on two sides of a nanocrystalline base strip, performing splitting treatment to obtain nanocrystalline strips with required magnetic permeability, and bonding a plurality of nanocrystalline strips to obtain a multilayer nanocrystalline strip;
cutting the multilayer nanocrystalline strip into preset sizes to form a nanocrystalline magnetic strip with a length a, a width b and a height c, wherein a is more than b and equal to c;
arranging the plurality of nanocrystalline magnetic strips at intervals of 0-10mm along a direction perpendicular to the lengths of the nanocrystalline magnetic strips; and
and (5) packaging to form the nanocrystalline magnetic isolation sheet for wireless charging.
8. The method of claim 7, wherein adjacent nanocrystalline magnetic strips are bonded in pairs with bonding surfaces formed by the length a and the height c, and are arranged without gaps in a direction perpendicular to the length of the nanocrystalline magnetic strips.
9. The method of claim 7, wherein a heat dissipation layer is applied between the contact surfaces of the nanocrystalline magnetic stripe formed with the length a and the height c, and the nanocrystalline magnetic stripe and the heat dissipation layer are arranged at intervals along a direction perpendicular to the length of the nanocrystalline magnetic stripe.
10. The method according to claim 9, wherein a heat dissipation layer is coated between two adjacent bonding surfaces, or a plurality of nanocrystalline magnetic strips are overlapped without gaps to form a nanocrystalline magnetic strip overlapped body, and a heat dissipation layer is coated between the adjacent nanocrystalline magnetic strip overlapped bodies, so that the interval arrangement between the nanocrystalline magnetic strips and the heat dissipation layer is implemented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111408862.4A CN116168930A (en) | 2021-11-24 | 2021-11-24 | Nanocrystalline magnetic isolation sheet for wireless charging and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111408862.4A CN116168930A (en) | 2021-11-24 | 2021-11-24 | Nanocrystalline magnetic isolation sheet for wireless charging and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116168930A true CN116168930A (en) | 2023-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111408862.4A Pending CN116168930A (en) | 2021-11-24 | 2021-11-24 | Nanocrystalline magnetic isolation sheet for wireless charging and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116168930A (en) |
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2021
- 2021-11-24 CN CN202111408862.4A patent/CN116168930A/en active Pending
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