CN109712775B - Preparation method of magnetic conductive sheet for wireless charger - Google Patents
Preparation method of magnetic conductive sheet for wireless charger Download PDFInfo
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- CN109712775B CN109712775B CN201910089771.5A CN201910089771A CN109712775B CN 109712775 B CN109712775 B CN 109712775B CN 201910089771 A CN201910089771 A CN 201910089771A CN 109712775 B CN109712775 B CN 109712775B
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Abstract
The invention provides a preparation method of a magnetic conductive sheet for a wireless charger, which comprises the following steps: s1, carrying out heat treatment on the magnetic alloy strip; s2, arranging a positioning magnetic tape, and enabling one surface of the heat-treated strip material to be covered and magnetically positioned on the positioning magnetic tape; s3, splitting the positioned magnetic alloy strip to enable the strip to be broken and form a plurality of magnetic fragments, wherein gaps are formed among the magnetic fragments, and the magnetic fragments are magnetically positioned on the positioning magnetic belt; s4, adhering and positioning the other side of the split strip through the lamination of the adhesive layers, and insulating each magnetic fragment in the strip; s5, removing the positioning tape to obtain a single-layer magnetic sheet; s6, covering a protective film on the surface side of the magnetic sheet and performing die cutting to finally obtain a magnetic conductive sheet; the preparation method of the magnetic conductive sheet has the technical advantages of good insulation treatment effect and simple preparation process.
Description
Technical Field
The invention relates to the technical field of wireless charging application, in particular to a preparation method of a magnetic conductive sheet for a wireless charger.
Background
The wireless charging is a technology for charging the battery of the terminal electric equipment in a wireless mode, and the electric energy supply end and the electric energy receiving end do not need to be physically connected. Currently, electronic devices charged by electromagnetic induction are the most common in the market.
In the prior art, the inductance of the whole material is improved by using ultrathin magnetic alloy materials such as amorphous or nanocrystalline strips with high magnetic permeability in a stacking mode, so that the structural design is more flexible and convenient; compared with the traditional ferrite material, the amorphous magnetic alloy material has much higher magnetic permeability and saturation magnetic induction intensity, also means that the amorphous alloy material can be very thin, provides a high-efficiency low-impedance working path for a charging magnetic field, and has good shielding effect because the magnetic component content of the material is high, thereby greatly avoiding the interference of the magnetic field penetrating through the magnetic conductive sheet on the internal components of the electronic product and also effectively shielding the interference of the internal magnetic field of the electronic product on the charging coil.
The magnetic permeability and the saturation magnetic flux density of the amorphous magnetic alloy material are ideal when being used in a wireless charging module, but the amorphous magnetic alloy material is an alternating-current magnetic field during wireless charging, the magnetic conducting sheet can generate loss to the magnetic field due to the factors of the material when working in the alternating-current magnetic field, the loss of the magnetic conducting sheet comprises hysteresis loss, eddy current loss and other loss, the eddy current loss is an important part for causing loss under the frequency condition of wireless charging, and because the amorphous magnetic alloy material is a metal material, the resistivity is low, if the material is not further processed, the amorphous magnetic alloy material can generate serious eddy current loss during working, the working magnetic field is consumed, and the charging efficiency of the wireless charging is further reduced; in addition, when wireless charging is carried out, the larger the unit area of the magnetic alloy material is, the more easily an eddy current effect is generated on a large area; therefore, it is necessary to break the magnetic alloy material, divide the large area of the magnetic alloy material into fine magnetic fragments, and insulate the magnetic fragments from each other, thereby effectively reducing the eddy current effect. However, the magnetic conductive sheet in the prior art has complex preparation process and poor insulation treatment effect.
Disclosure of Invention
The invention aims to provide a preparation method of a magnetic conductive sheet for a wireless charger to overcome the defects of the prior art.
The preparation method of the magnetic conductive sheet for the wireless charger comprises the following steps:
s1, carrying out heat treatment on the magnetic alloy strip;
s2, arranging a positioning magnetic tape, and enabling one surface of the heat-treated strip material to be covered and magnetically positioned on the positioning magnetic tape;
s3, splitting the positioned magnetic alloy strip to enable the strip to be broken and form a plurality of magnetic fragments, wherein gaps are formed among the magnetic fragments, and the magnetic fragments are magnetically positioned on the positioning magnetic belt;
s4, adhering and positioning the other side of the split strip through the lamination of the adhesive layers, and insulating each magnetic fragment in the strip;
s5, removing the positioning tape to obtain a single-layer magnetic sheet;
and S6, covering the surface side of the magnetic sheet with a protective film and carrying out die cutting to finally obtain the magnetic conductive sheet.
Further, the magnetic tape is a rubber magnetic tape with a magnetic surface, and the magnetic surface is isotropic single-sided multi-pole magnetized.
Further, the surface of the magnetic surface is coated with UV matte oil.
Furthermore, during the splitting treatment, a positioning coating is attached to the other surface of the magnetically positioned strip.
Further, in the step S3, a fracturing mold is provided, the fracturing mold is provided with a fracturing surface, and the fracturing surface is provided with a plurality of uniformly distributed pyramids; and in the splitting treatment, the magnetically positioned magnetic alloy strip is punched by the fracturing surface.
Further, the pyramid is a pentagonal pyramid, the diameter of the base of the pyramid is 0.2mm, the height of the pyramid is 0.8mm, and the distance between every two pentagonal pyramids is 0.3 mm.
Further, in step S4, the gaps between the magnetic fragments in the adhered and positioned tape are filled with air media, and the air media form insulation between the magnetic fragments.
Further, between the steps S5 to S6, the method includes the following steps:
s5-1, repeating the steps S1 to S5 to obtain at least two single-layer magnetic sheets;
s5-2, laminating the single-layer magnetic sheets, adhering the magnetic sheets through adhesive layers and insulating the magnetic sheets between the layers to obtain laminated magnetic sheets;
the invention has the beneficial effects that:
according to the preparation method of the magnetic conductive sheet, the magnetic alloy strip can be magnetically positioned on the detachable positioning magnetic belt, and the strip does not need to be fixed by viscose and then split, so that the splitting treatment effect is better, the distribution intervals of magnetic fragments are more uniform, and the prepared magnetic conductive sheet has the technical advantages of good insulation treatment effect, low energy consumption and simple preparation process.
According to the magnetic conductive sheet prepared by the preparation method, the air medium is used as the insulating medium of the magnetic conductive sheet, so that the eddy current effect can be effectively reduced while the application requirement of the magnetic conductive sheet in the wireless charging technology is met; has the technical advantages of good insulation treatment effect and simple preparation process.
Drawings
FIG. 1 is a schematic structural diagram of embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of embodiment 2 of the present invention;
FIG. 3 is a first structural diagram of embodiment 3 of the present invention;
FIG. 4 is a second structural diagram of embodiment 3 of the present invention;
FIG. 5 is a schematic view of a third structure of embodiment 3 of the present invention;
description of reference numerals:
the magnetic sheet comprises a first magnetic sheet 1, a first magnetic fragment 11, a second magnetic sheet 2, a second magnetic fragment 21, an adhesive layer 3, a second adhesive layer 31, an air medium 4 and a protective film 5.
Detailed Description
In order to make the technical solution, the purpose and the advantages of the present invention more apparent, the present invention will be further explained with reference to the accompanying drawings and embodiments.
The magnetic conducting sheet for the wireless charger comprises a first magnetic sheet layer formed by a plurality of fragmented and separated first magnetic fragments, wherein the first magnetic fragments in the first magnetic sheet are adhered and positioned by an adhesion layer, and an air medium is filled between the first magnetic fragments to insulate the first magnetic fragments from each other.
Example 1:
as shown in fig. 1, the magnetic conductive sheet is configured as a single-layer first magnetic sheet, the first magnetic sheet includes an adhesion layer and a first magnetic fragment adhered above the adhesion layer, a protective film is adhered to an upper surface of the first magnetic fragment, and a release film is adhered to a lower side of the adhesion layer.
Example 2:
as shown in fig. 2, the magnetic conductive sheet is configured as a laminated structure of at least two first magnetic sheets, and the first magnetic sheets are adhered to each other through an adhesion layer to form an interlayer insulation; the upper side surface of a first magnetic fragment in the first magnetic sheet of the uppermost layer of the magnetic conductive sheet is attached with a protective film, and the lower side of an adhesive layer in the first magnetic sheet of the lowermost layer of the magnetic conductive sheet is attached with a release film.
In the above embodiments 1 and 2, the material of the first magnetic fragment is iron-based amorphous or nanocrystalline; form into an organic whole when making the adhesion layer and set up, specifically, be OCA ya gram force sticky tape promptly from the combination of type membrane and adhesion layer, the adhesion layer is conventional double-sided adhesive layer promptly.
Example 3:
as shown in fig. 3 to 5, the magnetic conductive sheet further includes a second magnetic sheet, the first magnetic sheet has a first magnetic conductivity, and the second magnetic sheet has a second magnetic conductivity; the magnetic conductive sheet is arranged in a laminated combination mode of a first magnetic sheet and a second magnetic sheet, and the second magnetic sheet is adhered to the first magnetic sheet through an adhesion layer to form interlayer insulation; the protective film is attached to the upper side surface of the magnetic fragment in the magnetic sheet on the layer at the uppermost end of the magnetic conductive sheet, and the release film is attached to the lower side of the adhesive layer in the magnetic sheet on the layer at the lowermost end of the magnetic conductive sheet.
The second magnetic sheet comprises a plurality of separated second magnetic fragments, and air media are filled between the second magnetic fragments to insulate the second magnetic fragments from each other.
In addition, the second magnetic sheet may also be applied in a conventional insulation processing manner, that is, the gap between the second magnetic fragments is filled with a portion of the second adhesion layer to insulate the second magnetic fragments, and specifically, the portion of the second adhesion layer of the second magnetic sheet is applied as an insulation glue.
In example 3 above, the first magnetic fragment is made of one of an amorphous sheet, a ferrite sheet, a permalloy sheet, and a molypermalloy powder sheet, and the second magnetic fragment is made of a polymer sheet formed of magnetic powder and resin; or the first magnetic fragments are made of amorphous sheets, and the second thin magnetic sheets are made of ferrite sheets.
The preparation method of the magnetic conductive sheet for the wireless charger comprises the following steps:
(1) carrying out heat treatment on the magnetic alloy strip;
(2) a positioning magnetic tape is arranged, so that one surface of the heat-treated strip material is covered and magnetically positioned on the positioning magnetic tape; the magnetic tape is a rubber magnetic tape with a magnetic surface, the magnetic surface is isotropic single-sided multi-pole magnetized, and the surface of the magnetic surface is coated with UV matte oil, so that the surface suction of the magnetic surface reaches 18g/cm2；
(3) Splitting the positioned magnetic alloy strip to enable the strip to be cracked and form a plurality of magnetic fragments, wherein gaps are formed among the magnetic fragments, and the magnetic fragments are magnetically positioned on the positioning magnetic belt;
during the splitting treatment, a positioning film can be adhered to the other surface of the magnetically positioned strip; the positioning film is a 75um PET original film to ensure that the magnetic alloy strip is flatly adsorbed on the magnetic belt and the magnetic fragments formed after the fragmentation are orderly arranged in the original appearance state; gaps for filling insulating media are formed among the magnetic fragments, and the phenomenon of scattering or gaps of the magnetic fragments after fragmentation can be avoided; after the splinter treatment, the positioning covering film can be taken down so as to position the magnetic tape to carry out magnetic positioning on the splinted magnetic fragments.
In the splitting treatment process, a high-speed die cutting machine can be applied, a splitting die is used for splitting the surface of the strip pasted with the positioning film, the splitting die is provided with a splitting surface, a plurality of uniformly distributed pentagonal pyramids are arranged on the splitting surface, the diameter of the bottom of each pentagonal pyramid is 0.2mm, the height of each pentagonal pyramid is 0.8mm, and the distance between the pentagonal pyramids is 0.3 mm; and the positioned magnetic alloy strip is stamped by the fracturing surface, so that the size range of the stamped magnetic fragments is ensured to be 0.2 +/-0.1 mm, and the fragments are more uniform and the magnetic conductivity is more stable.
(4) Adhering and positioning the other surface of the strip subjected to the splitting treatment through the lamination of the adhesive layer, and filling gaps among the magnetic fragments in the strip subjected to the adhering and positioning with air media or parts of the adhesive layer to form insulation among the magnetic fragments;
(5) taking down the positioning magnetic tape to obtain a single-layer magnetic sheet;
(6) repeating the steps (1) to (5) to obtain at least two single-layer magnetic sheets;
(7) laminating the single-layer magnetic sheets according to the requirements of wireless charging or NFC on the BS value LS value and the like, adhering the magnetic sheets through adhesive layers and forming interlayer insulation to obtain laminated magnetic sheets;
(8) and covering the surface side of the magnetic sheet with a protective film and performing die cutting to finally obtain the magnetic conductive sheet.
The above description is only a preferred embodiment of the present invention, and those skilled in the art may still modify the described embodiment without departing from the implementation principle of the present invention, and the corresponding modifications should also be regarded as the protection scope of the present invention.
Claims (5)
1. The preparation method of the magnetic conductive sheet for the wireless charger is characterized by comprising the following steps:
s1, carrying out heat treatment on the magnetic alloy strip;
s2, arranging a positioning magnetic tape, and enabling one surface of the heat-treated strip material to be covered and magnetically positioned on the positioning magnetic tape; the positioning magnetic tape is a rubber magnetic tape with a magnetic surface, the magnetic surface is isotropic single-sided multi-pole magnetized, and the surface suction of the magnetic surface reaches 18g/cm2；
S3, attaching a positioning film to the other side of the magnetically positioned strip, and splitting the positioned magnetic alloy strip to break the strip and form a plurality of magnetic fragments, wherein gaps are formed among the magnetic fragments and the magnetic fragments are magnetically positioned on the positioning magnetic belt;
s4, adhering and positioning the other surface of the strip subjected to the splitting treatment through the lamination of the adhesive layer, filling air media into gaps among the magnetic fragments in the strip subjected to the adhering and positioning, and insulating the magnetic fragments by the air media;
s5, removing the positioning tape to obtain a single-layer magnetic sheet;
and S6, covering the surface side of the magnetic sheet with a protective film and carrying out die cutting to finally obtain the magnetic conductive sheet.
2. The method of claim 1, wherein a surface of the magnetic surface is coated with a UV matte oil.
3. The method according to claim 1, wherein in step S3, a fracturing mold is provided, the fracturing mold is provided with a fracturing surface, and the fracturing surface is provided with a plurality of uniformly distributed pyramids; and in the splitting treatment, the magnetically positioned magnetic alloy strip is punched by the fracturing surface.
4. The method of claim 3 wherein said pyramids are pentagonal pyramids having a base diameter of 0.2mm, a height of 0.8mm, and a distance between each of said pentagonal pyramids of 0.3 mm.
5. The method of any one of claims 1 to 4, wherein the steps S5 to S6 include the following steps:
s5-1, repeating the steps S1 to S5 to obtain at least two single-layer magnetic sheets;
and S5-2, laminating the single-layer magnetic sheets, adhering the magnetic sheets through the adhesive layers and insulating the magnetic sheets between the layers to obtain the laminated magnetic sheets.
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