CN210443363U - Magnetic conductive sheet for wireless charger - Google Patents
Magnetic conductive sheet for wireless charger Download PDFInfo
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- CN210443363U CN210443363U CN201920160589.XU CN201920160589U CN210443363U CN 210443363 U CN210443363 U CN 210443363U CN 201920160589 U CN201920160589 U CN 201920160589U CN 210443363 U CN210443363 U CN 210443363U
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Abstract
The utility model provides a pair of magnetic conductive sheet for wireless charger, include: a first magnetic sheet composed of a plurality of first magnetic fragments which are fragmented and separated, each of the first magnetic fragments being adhesively positioned by an adhesive layer; gaps are formed among the first magnetic fragments, air media are filled in the gaps to enable the first magnetic fragments to be mutually insulated, and protective films are covered on the surface sides of the magnetic conductive sheets; the utility model discloses a magnetic conductive sheet, through adopting the air medium as the insulating medium of magnetic conductive sheet, when satisfying the application demand of magnetic conductive sheet in the wireless charging technique, can effectively reduce the eddy current effect; has the technical advantages of good insulation treatment effect and simple preparation process.
Description
Technical Field
The utility model relates to a wireless application technical field that charges, concretely relates to magnetic conductive plate for 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.
The prior art utilizes ultra-thin magnetic alloy materials such as amorphous or nanocrystalline ribbons with high magnetic permeability. The thickness range of the single-layer magnetic alloy material is 10-30 um, the whole inductance of the material can be improved in a stacking mode, and 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.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a magnetic conductive sheet for wireless charger for overcoming prior art's deficiency.
Wireless magnetism conduction piece for charger includes: a first magnetic sheet composed of a plurality of first magnetic fragments which are fragmented and separated, each of the first magnetic fragments being adhesively positioned by an adhesive layer; gaps are formed among the first magnetic fragments, air media are filled in the gaps to enable the first magnetic fragments to be mutually insulated, and protective films are covered on the surface sides of the magnetic conductive sheets.
The application principle is as follows:
the air medium is filled between the magnetic fragments, so that the flowing air medium wraps the magnetic fragments to form insulation, and the functional requirements of the magnetic conducting sheet are met; under normal application, the relative permeability of air is 1, so that the filling application of the air medium can effectively reduce the real part permeability and the imaginary part permeability in the magnetic conductive sheet.
Furthermore, the first magnetic sheets are laminated with at least two layers, and the first magnetic sheets are adhered through adhesive layers to form interlayer insulation; the application requirement of the magnetic conductive sheet for wireless charging is further met through the arrangement of the laminated form.
Further, the first magnetic fragment is iron-based amorphous or nanocrystalline.
The magnetic sheet structure further comprises a second magnetic sheet, wherein the first magnetic sheet has a first magnetic permeability, the second magnetic sheet has a second magnetic permeability, the second magnetic sheet is laminated with the first magnetic sheet, and the second magnetic sheet is adhered with the first magnetic sheet through an adhesion layer and forms interlayer insulation.
The magnetic sheets with different magnetic conductivities are combined to meet the requirements of different application conditions of the magnetic conductive sheet for wireless charging.
Further, the second magnetic sheet includes a plurality of separated second magnetic fragments, and an air medium is filled between the second magnetic fragments to insulate the second magnetic fragments from each other.
Further, the first magnetic fragments are one of amorphous sheets, ferrite sheets, permalloy sheets and molybdenum permalloy powder sheets, and the second magnetic fragments are polymer sheets formed by magnetic powder and resin; or the first magnetic fragment is an amorphous sheet and the second magnetic fragment is a ferrite sheet.
The beneficial effects of the utility model reside in that:
the utility model discloses a magnetic conductive sheet, through adopting the air medium as the insulating medium of magnetic conductive sheet, when satisfying the application demand of magnetic conductive sheet in the wireless charging technique, can effectively reduce the eddy current effect; 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 schematic diagram of embodiment 3 of the present invention;
fig. 4 is a second schematic structural diagram of embodiment 3 of the present invention;
fig. 5 is a third structural diagram 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, objects and advantages of the present invention more clearly understood, the present invention is further explained with reference to the accompanying drawings and embodiments.
The utility model discloses a magnetic conduction piece for wireless charger, include the first magnetic thin slice of one deck that comprises the first magnetic fragment of a plurality of cracked separations, first magnetic fragment in the first magnetic thin slice all carries out adhesion and location with the adhesion layer, each it is so that each to be filled with air medium between the first magnetic fragment is insulating 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 fragment is made of an amorphous sheet, and the second magnetic fragment is made of a ferrite sheet.
The utility model provides a preparation method of magnetic conductive sheet for preparing wireless charger, including following step:
(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 force of the magnetic surface reaches 18g/cm 2;
(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 lobe processing process, a fracturing die can be used for fracturing the surface of the strip which is pasted with the positioning film, the fracturing die is provided with a fracturing surface, the fracturing surface is provided with a plurality of uniformly distributed pentagonal pyramids, 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 is only the preferred embodiment of the present invention, and to the technical personnel in the technical field, without departing from the present invention, the embodiment can still be modified, and the corresponding modification should also be regarded as the protection scope of the present invention.
Claims (6)
1. Wireless magnetism conduction piece for charger, its characterized in that includes: a first magnetic sheet composed of a plurality of first magnetic fragments which are fragmented and separated, each of the first magnetic fragments being adhesively positioned by an adhesive layer; gaps are formed among the first magnetic fragments, and air media are filled in the gaps to enable the first magnetic fragments to be mutually insulated; and a protective film is coated on the surface side of the magnetic conductive sheet.
2. The magnetic conductive sheet of claim 1, wherein the first magnetic sheets are stacked in at least two layers, and each layer of the first magnetic sheets is adhered to each other by an adhesion layer and forms an interlayer insulation.
3. The magnetic conductive sheet of claim 1, wherein the first magnetic fragment is iron-based amorphous or nanocrystalline.
4. The magnetically permeable sheet of claim 1, further comprising a second magnetic sheet, the first magnetic sheet having a first magnetic permeability, the second magnetic sheet having a second magnetic permeability, the second magnetic sheet being laminated to the first magnetic sheet, the second magnetic sheet being adhered to the first magnetic sheet by an adhesive layer and forming an interlayer insulation.
5. The magnetically conductive sheet of claim 4, wherein the second magnetic sheet comprises a plurality of separate second magnetic fragments, and an air medium is filled between each of the second magnetic fragments to insulate each of the second magnetic fragments from each other.
6. The magnetic conductive sheet according to claim 5, wherein the first magnetic pieces are one of amorphous sheets, ferrite sheets, permalloy sheets, and molypermalloy powder sheets, and the second magnetic pieces are polymer sheets formed of magnetic powder and resin; or the first magnetic fragment is an amorphous sheet and the second magnetic fragment is a ferrite sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920160589.XU CN210443363U (en) | 2019-01-30 | 2019-01-30 | Magnetic conductive sheet for wireless charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920160589.XU CN210443363U (en) | 2019-01-30 | 2019-01-30 | Magnetic conductive sheet for wireless charger |
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| Publication Number | Publication Date |
|---|---|
| CN210443363U true CN210443363U (en) | 2020-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920160589.XU Active CN210443363U (en) | 2019-01-30 | 2019-01-30 | Magnetic conductive sheet for wireless charger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109671549A (en) * | 2019-01-30 | 2019-04-23 | 深圳市晶磁材料技术有限公司 | Wireless charger magnetic conduction sheet and preparation method thereof |
-
2019
- 2019-01-30 CN CN201920160589.XU patent/CN210443363U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109671549A (en) * | 2019-01-30 | 2019-04-23 | 深圳市晶磁材料技术有限公司 | Wireless charger magnetic conduction sheet and preparation method thereof |
| CN109671549B (en) * | 2019-01-30 | 2024-02-06 | 深圳市晶磁材料技术有限公司 | Magnetic conductive sheet for wireless charger and preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200428 Address after: 518106 402, building 4, Xianan third industrial zone, Shangcun community, Gongming street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Dingtai magnetic material Co., Ltd Address before: 518106 Siquan Industrial Park, Jiangbian Village Haikou Industrial Zone, Dongguan City, Guangdong Province Patentee before: SHENZHEN JINGCI MATERIAL TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201118 Address after: 518000 the third floor of Yuwei factory building at the junction of Qingxiang road and Qinghua Road, Qinghu community, Longhua street, longzuo District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN JINGCI MATERIAL TECHNOLOGY Co.,Ltd. Address before: 518106 402, building 4, Xianan third industrial zone, Shangcun community, Gongming street, Guangming New District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Dingtai magnetic material Co.,Ltd. |