CN115474420A - Preparation process of high-performance wireless charging electromagnetic shielding sheet and electromagnetic shielding sheet - Google Patents
Preparation process of high-performance wireless charging electromagnetic shielding sheet and electromagnetic shielding sheet Download PDFInfo
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- CN115474420A CN115474420A CN202210860994.9A CN202210860994A CN115474420A CN 115474420 A CN115474420 A CN 115474420A CN 202210860994 A CN202210860994 A CN 202210860994A CN 115474420 A CN115474420 A CN 115474420A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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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
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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Abstract
The invention discloses a preparation process of a high-performance electromagnetic shielding sheet for wireless charging and the electromagnetic shielding sheet. And through heating and rolling treatment of the coil after magnetic crushing, colloid flow is promoted, loss of magnetic sheets during charging is controlled, and under the condition of the same magnetic conductivity, the imaginary part magnetic conductivity of the material is reduced, so that higher charging efficiency is achieved. The soft magnetic strip made of a specific material and having a special structure is selected to be rechecked with the WPC antenna to obtain the low-loss magnetic conducting sheet, so that the WPC charging efficiency is improved, the module loss is lower, the heating is less, the Q value is higher, and the performance is better. The wireless charging device can bear higher power, realize high-power wireless charging, obviously improve the offset efficiency, greatly improve the customer experience and shorten the charging time.
Description
Technical Field
The invention relates to the field of electromagnetic shielding sheets, H05K9/00, in particular to a preparation process of a high-performance electromagnetic shielding sheet for wireless charging and an electromagnetic shielding sheet.
Background
The wireless charging technology is a novel technology for charging electronic equipment by realizing electric energy transmission in a wireless mode, and is also called non-contact charging, the current modes for realizing wireless energy transmission mainly comprise three types of currently mainly applied modes, namely electromagnetic induction, electromagnetic resonance and radio waves, and an alternating magnetic field is formed by a primary coil of a transmitting device and a secondary coil of a receiving device to charge a battery. But can have electron vortex, cause the battery to generate heat, disturb the electrical apparatus work on every side scheduling problem, and electromagnetic shielding piece then can reach shielding electromagnetism, magnetic isolation, magnetic conduction, effect of raising the efficiency, can bring the magnetic loss equally, both include hysteresis lag and eddy current loss of magnetic sheet itself, also include the magnetic leakage loss that the shielding performance of magnetic conduction piece caused inadequately. Therefore, it is a trend of material research and development to find a process that can reduce the hysteresis and eddy current loss of the magnetic conductive sheet itself and also increase the shielding performance of the magnetic conductive sheet.
Chinese patent application CN201510977190.7 discloses a method for preparing an electromagnetic shielding sheet for wireless charging and an electromagnetic shielding sheet, wherein after the winding step, heat treatment, glue coating, adhesion and patterning are performed, and the obtained strip has controllable electromagnetic performance, optimizes charging efficiency, and exerts the electromagnetic shielding effect of the electromagnetic shielding sheet to the maximum extent, but the charging efficiency is still to be improved. Chinese patent application CN202011202813.0 discloses a wireless charging shielding sheet and a preparation method thereof, a wireless charging module and magnetic crushing equipment, wherein the wireless charging shielding sheet is obtained by performing glue coating, magnetic crushing and heat treatment on a magnetic conduction layer after heat treatment, so that filling of glue and insulating glue in gaps is promoted, insulativity among small magnetic sheets is increased, eddy current loss is reduced, and imaginary part magnetic conductivity is higher under the condition of equal magnetic conductivity.
Disclosure of Invention
In order to solve the above problems, a first aspect of the present invention provides a process for preparing a high-performance electromagnetic shielding sheet for wireless charging, comprising the following steps:
s1, material selection: selecting a soft magnetic strip as a magnetic material of the magnetic conducting sheet, and selecting a double-sided adhesive tape as bonding and bearing;
in some preferred embodiments, the soft magnetic ribbon is selected from at least one of amorphous, nanocrystalline; preferably, the soft magnetic ribbon is nanocrystalline.
In some preferred embodiments, the nanocrystals are selected from at least one of normal nanocrystals, high Bs nanocrystals; preferably, the nanocrystals are high Bs nanocrystals.
In some preferred embodiments, the high Bs nanocrystals include at least one of Fe, co, ni, cu, au, nb, mo, mn; preferably, the high Bs nanocrystals comprise Fe, cu, si, nb, B; further preferably, the thickness of the high Bs nanocrystal is 14-34 um, the magnetic induction intensity Bs is more than or equal to 1.3T, the magnetic permeability 100kHz and 0.3A/m is more than or equal to 7500H/m; more preferably, the thickness of the high Bs nanocrystal is 16-22 μm, and the magnetic induction intensity Bs =1.4T,100kHz, and the magnetic permeability of 0.3A/m is more than or equal to 10000H/m.
S2, soft magnetic strip processing: corroding the surface of the soft magnetic strip through corrosive liquid, removing the stress layer on the surface, cleaning and drying;
in some preferred embodiments, the etching solution in S2 is at least one selected from the group consisting of an aqueous hydrochloric acid solution, a dilute aqueous sulfuric acid solution, an aqueous acetic acid solution, an aqueous oxalic acid solution, an aqueous phosphoric acid solution, an aqueous caustic soda solution, an aqueous potassium hydroxide solution, an aqueous sodium sulfate solution, an aqueous sodium carbonate solution, an aqueous sodium acetate solution, an aqueous sodium chloride solution, and an aqueous potassium chloride solution; preferably, the corrosive liquid in the S2 is a hydrochloric acid aqueous solution.
In some preferred embodiments, the aqueous hydrochloric acid solution has a pH of 2 to 4; preferably, the pH of the aqueous hydrochloric acid solution is 2.2.
In the application, the etching solution is used for treating the soft magnetic alloy, so that countless grooves and micropores are formed on the surface, and the insulating property of the nanocrystalline soft magnetic alloy is improved. Presumably, the particles in the etching solution can be ionized completely, a galvanic cell structure is formed in the processing process, a certain corrosion effect is caused on the surface of the alloy, the surface of the nanocrystalline is microscopically rough, the surface of the nanocrystalline alloy is enlarged, the required locking effect between the oxidation film and the nanocrystalline soft magnetic alloy is ensured, the bonding strength between the film and the nanocrystalline alloy is improved, a passivation film is formed in the processing process of the etching solution, the corrosion effect of the etching solution is reduced, and the insulativity of the alloy is enhanced. The applicant finds that when the corrosive liquid is hydrochloric acid aqueous solution and the pH is 2-4, particularly 2.2, the stress layer on the surface of the alloy can be removed and infiltrated into the alloy by combining with specific treatment time, the microstructure of the alloy is optimized, and the magnetic field distribution of the alloy is uniform.
S3, winding: winding the soft magnetic strip material obtained in the step S2 into a small coil for the subsequent process;
s4, heat treatment: placing the small coil of soft magnetic strip coiled in the step S3 into a heat treatment furnace for heat treatment, and then cooling to room temperature;
in some preferred embodiments, the heat treatment in S4 includes:
(1) Pretreatment: heating to 400-500 deg.c and maintaining at high temperature for 1-180 min;
(2) And (3) heat treatment: continuously heating to 500-650 deg.C, and maintaining at high temperature for 30-150 min.
Preferably, the heat treatment in S4 includes:
(1) Pretreatment: heating to 450 deg.C, and maintaining at high temperature for 100min;
(2) And (3) heat treatment: heating to 550 deg.C, and maintaining at high temperature for 120min.
In some preferred embodiments, the cooling rate in the cooling process in S4 is 3 to 30 ℃/min; preferably, the cooling rate in the cooling process in the step S4 is 15 ℃/min.
S5, laminating: carrying out single-side glue coating treatment on the soft magnetic strip obtained in the step S4;
in some preferred embodiments, the single-sided adhesive coating process in S5 is roll-to-roll.
In some preferred embodiments, the colloid used in the single-sided adhesive coating treatment in S5 is at least one selected from the group consisting of silica gel, resin, acrylic adhesive, and polyurethane adhesive.
S6, multilayer laminating: gluing the glued surface of the strip obtained in the step (S5) with the non-glued surface of the other roll of strip to obtain the electromagnetic shielding sheet coiled material;
in some preferred embodiments, the electromagnetic shielding sheet roll in S6 has a single-layer structure or a multi-layer structure.
In some preferred embodiments, the number of layers of the roll of the multi-layered electromagnetic shielding sheet is selected from 2 to 10 layers; preferably, the number of layers of the coiled material of the electromagnetic shielding sheet with the multilayer structure is 3.
In some preferred embodiments, the magnetic sheets of the electromagnetic shielding sheet roll may be one or more magnetic tapes used together.
S7, multilayer magnetic crushing: performing magnetic crushing treatment on the electromagnetic shielding sheet coiled material attached in the S6 by adopting a magnetic crushing roller to obtain electromagnetic shielding sheet particles with different shapes, sizes and gaps, performing heating treatment and rolling treatment on the particles subjected to magnetic crushing, and cooling to room temperature to obtain an electromagnetic shielding sheet;
high-frequency magnetic field signals are inevitably generated in the wireless charging process, and the shielding effect of the magnetic shielding piece on the high-frequency signals can be improved after the magnetic shielding piece is smashed and magnetized, so that the eddy current loss is reduced. Presumably, in the application, the multilayer magnetic shielding sheet is subjected to magnetic crushing treatment to form smaller alloy particles with a certain thickness, so that the surface resistance of the alloy particles is increased, the magnetic resistance of gaps among the alloy particles is also larger, the current distribution on the surface of the shielding sheet is blocked, the skin effect is reduced, the current density at the center of the electromagnetic shielding sheet is increased, and the eddy current loss and heat dissipation in a working state are reduced. However, the problem of uneven size of the magnetic shielding sheets after being bonded in multiple layers is very easy to occur in the process of magnetic crushing treatment, so that the microstructure of the magnetic shielding sheets is changed, the electromagnetic shielding effect of the magnetic shielding sheets is reduced, and the problems of magnetic leakage, local heating and the like are caused. Through the two-sided garrulous magnetic roller that utilizes the self-designed to obtain in this application, it is even to ensure the garrulous magnetism in both sides, through shape and the size of the garrulous magnetic roller line of adjustment to the shape of granule, size, the size in clearance in the control magnetic sheet, with to heating, the roll-in processing synergism behind the garrulous magnetism, improve colloid mobility, make glue fill in the gap, thereby the loss of magnetic sheet when control charges, and then improve charge efficiency.
In some preferred embodiments, the magnetic crushing roller in S7 is a self-designed double-sided magnetic crushing roller, as shown in fig. 1 and 2.
In some preferred embodiments, the shape of the electromagnetic shielding sheet particles in S7 is selected from at least one of a regular shape and an irregular shape.
In some preferred embodiments, the irregular shape is selected from at least one of a circular, square, triangular, trapezoidal, pentagonal, hexagonal, and the like geometric shape.
In some preferred embodiments, the particle size of the electromagnetic shielding sheet particles in S7 is 0.5um to 10mm; preferably, the particle size of the electromagnetic shielding sheet particles in S7 is 5 μm to 5mm; further preferably, the particle size of the electromagnetic shielding sheet particles in S7 is 100 μm to 2mm; still further preferably, the particle size of the electromagnetic shielding sheet particles in S7 is 900 μm.
In some preferred embodiments, the gaps between the particles of the electromagnetic shielding sheet in S7 are 2um to 20um; preferably, the gaps between the particles of the electromagnetic shielding sheet in S7 are 5um to 15um; further preferably, the gap between the particles of the electromagnetic shielding sheet in S7 is 8um.
The present applicant found that when the particle size of the electromagnetic shielding sheet particles is set to 0.5um to 10mm and the gap is set to 2um to 20um after the heat treatment, excellent magnetic properties can be obtained. It is possible that when the particles and gaps of the nanocrystals are in the above-mentioned range, the specific surface area of the particles increases, and the magnetic destruction capability of the possible oxide in the shell increases, thereby resulting in a decrease in the magnetic properties of the particles and an increase in the saturation magnetization resistance thereof. Moreover, the pinning effect of the nano-crystalline grains with the size on a domain wall is weak, the coercivity is changed into nucleation mechanism control, the exchange coupling effect among the crystalline grains is synchronously weakened, the intrinsic coercivity is greatly reduced, and the imaginary part magnetic permeability of the material is reduced under the condition of the same magnetic permeability. The applicant has found that when the particle size of the electromagnetic shielding sheet particles is set to 900 μm and the gap is set to 8 μm, the imaginary part magnetic permeability and eddy current loss can be effectively reduced, high-power wireless charging can be better realized, and the quality factor of the wireless charging can be improved.
In some preferred embodiments, the temperature of the heating treatment in S7 is 60 to 150 ℃ for 0.1 to 10min; preferably, the temperature of the heating treatment in S7 is 120 ℃ and the time is 2min.
In some preferred embodiments, the gaps between the particles of the electromagnetic shielding sheet in S7 may be filled with an insulating paste.
According to the method, the soft magnetic strip is coated with the glue to obtain the coiled material with the multilayer structure after heat treatment, then the magnetic treatment is carried out on the coiled material, the shielding effect of the material on high-frequency signals is effectively improved, the eddy current loss in the charging process is reduced, and the higher charging efficiency is realized. The particle size of the material is set to be 0.5-10 mm, the gap is set to be 2-20 um, the material and the heat treatment and the hot roller treatment are cooperated, the influence of unbalanced stress generated after the heat treatment on the magnetic performance is effectively relieved, the shielding performance of the material is improved, the eddy current loss of the material is further reduced, when the magnetic conductivity range is 50-20000 at 100kHz, the magnetic conductivity of the imaginary part is obviously reduced under the condition of the same magnetic conductivity, and the wireless charging with higher power is realized.
S8, die cutting: punching the electromagnetic shielding sheet in the step S7 according to the size requirement to obtain the electromagnetic shielding sheet with the required size;
s9, assembling: and (5) attaching the electromagnetic shielding sheet shown in the step (S8) to the coil to obtain the final electromagnetic shielding sheet assembly.
The second aspect of the invention provides a high-performance electromagnetic shielding sheet for wireless charging, which is obtained by the preparation method.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the method, the soft magnetic strip coiled material is subjected to heat treatment, film coating, multilayer lamination and multilayer magnetic crushing treatment, the crushing magnetic gap is reduced, the same magnetic conductivity is achieved, fragments are smaller, the shielding performance of the material is enhanced, the hysteresis and eddy current loss of the material are obviously reduced, and the heating phenomenon in the charging process is reduced. And through heating and rolling treatment of the coil after magnetic crushing, colloid flow is promoted, loss of magnetic sheets during charging is controlled, and under the condition of the same magnetic conductivity, the imaginary part magnetic conductivity of the material is reduced, so that higher charging efficiency is achieved.
(2) Select in this application with specific material, special construction's soft magnetic strip, carry out recheck with the WPC antenna and obtain low-loss magnetic conduction piece, make WPC charge efficiency obtain improving, the module loss is lower, it is still less to generate heat, the Q value is higher, the performance is more excellent, can bear higher power, realizes powerful wireless charging, and skew efficiency obviously improves the improvement, has improved customer experience degree greatly, shortens the charge time.
Drawings
FIG. 1 Process flow diagrams for examples 1 and 2
FIG. 2 schematic diagram of the multilayer magnetic crushing process in example 1
Detailed Description
Example 1
1. A preparation process of a high-performance electromagnetic shielding sheet for wireless charging comprises the following steps:
s1, material selection: selecting a soft magnetic strip as a magnetic conductive material of the magnetic conductive sheet, and selecting a double-sided adhesive tape for bonding and bearing;
the soft magnetic strip is nanocrystalline. The nanocrystals are high Bs nanocrystals.
The high Bs nanocrystal comprises Fe, cu, si, nb and B; the thickness of the high Bs nanocrystal is 16-22 mu m, the magnetic induction density Bs =1.4T,100kHz, and the magnetic permeability of 0.3A/m is more than or equal to 10000H/m (purchased from Qingdao advanced materials technology Co., ltd., name YNC).
S2, soft magnetic strip processing: carrying out corrosion treatment on the surface of the soft magnetic strip by using a corrosive liquid, removing a surface stress layer, and then cleaning and drying;
and the corrosive liquid in the S2 is hydrochloric acid aqueous solution.
The pH value of the hydrochloric acid aqueous solution is 2.2.
S3, winding: winding the soft magnetic strip material obtained in the step S2 into a small coil for the subsequent process;
s4, heat treatment: placing the small coil of soft magnetic strip coiled in the S3 into a heat treatment furnace for heat treatment, and then cooling to room temperature;
the heat treatment in S4 includes:
(1) Pretreatment: heating to 450 deg.C, and maintaining at high temperature for 100min;
(2) And (3) heat treatment: heating to 550 deg.C, and maintaining at high temperature for 120min.
And the cooling rate in the cooling process in the step S4 is 15 ℃/min.
S5, laminating: carrying out single-side glue coating treatment on the soft magnetic strip obtained in the step S4;
and the single-sided adhesive coating treatment process in the step S5 is roll-to-roll.
The colloid used for single-sided adhesive coating treatment in S5 is acrylic adhesive (Shenzhen Shanshan packaging material Co., ltd.).
S6, multilayer laminating: and (6) adhering the adhesive surface of the strip material obtained in the step (S5) to the adhesive-free surface of the other roll of strip material to obtain the electromagnetic shielding sheet coiled material.
And S6, the electromagnetic shielding sheet coiled material is of a multilayer structure.
The number of layers of the electromagnetic shielding sheet coiled material with the multilayer structure is 3.
Each layer of magnetic sheet of the electromagnetic shielding sheet coiled material is a magnetic strip.
S7, multilayer magnetic crushing: performing magnetic crushing treatment on the electromagnetic shielding sheet coiled material attached in the S6 by using a magnetic crushing roller to obtain electromagnetic shielding sheet particles with different shapes, sizes and gaps, performing heating treatment and rolling treatment on the particles subjected to magnetic crushing, and cooling to room temperature to obtain an electromagnetic shielding sheet;
and in the S7, the magnetic crushing roller is a double-sided magnetic crushing roller which is designed by self. And in the step S7, the shape of the electromagnetic shielding sheet particles is irregular.
The irregular shape is a square.
The particle size of the electromagnetic shielding sheet particles in S7 is 900 μm.
And gaps among the particles of the electromagnetic shielding sheet in the S7 are 8um.
The heating treatment temperature in the step S7 is 120 ℃, and the time is 2min.
And filling insulating glue in gaps among the electromagnetic shielding sheet particles in the S7.
S8, die cutting: punching the electromagnetic shielding sheet in the S7 according to the size requirement to obtain the electromagnetic shielding sheet with the required size and the target magnetic conductivity;
s9, assembling: and (5) attaching the electromagnetic shielding sheet shown in the step (S8) to the coil to obtain the final electromagnetic shielding sheet assembly.
2. A high-performance electromagnetic shielding sheet for wireless charging is obtained by the preparation method.
Example 2
1. A preparation process of a high-performance electromagnetic shielding sheet for wireless charging is different from that of embodiment 1 in that:
the number of layers of the electromagnetic shielding sheet coiled material with the multilayer structure is 5.
2. A high-performance electromagnetic shielding sheet for wireless charging is obtained by the preparation method.
Example 3
1. A preparation process of a high-performance electromagnetic shielding sheet for wireless charging is different from that of embodiment 1 in that:
step S2 is not included: soft magnetic strip processing: and (3) carrying out corrosion treatment on the surface of the soft magnetic strip through corrosive liquid, removing the surface stress layer, and then cleaning and drying.
2. A high-performance electromagnetic shielding sheet for wireless charging is obtained by the preparation method.
Example 4
1. A preparation process of a high-performance electromagnetic shielding sheet for wireless charging is different from that of embodiment 1 in that:
s6 is broken magnet, and S7 is multilayer lamination.
2. A high-performance electromagnetic shielding sheet for wireless charging is obtained by the preparation method.
Example 5
1. A preparation process of a high-performance electromagnetic shielding sheet for wireless charging is different from that of embodiment 1 in that:
the particle size of the electromagnetic shielding sheet particles in S7 is 12mm.
2. A high-performance electromagnetic shielding sheet for wireless charging is obtained by the preparation method.
Example 6
1. A preparation process of a high-performance electromagnetic shielding sheet for wireless charging is different from that of embodiment 1 in that:
and gaps among the electromagnetic shielding sheet particles in S7 are 25 μm.
2. A high-performance electromagnetic shielding sheet for wireless charging is obtained by the preparation method.
Example 7
1. A preparation process of a high-performance electromagnetic shielding sheet for wireless charging is different from that of embodiment 1 in that:
the pH value of the hydrochloric acid aqueous solution is 1.5.
2. A high-performance electromagnetic shielding sheet for wireless charging is obtained by the preparation method.
Example 8
1. A preparation process of a high-performance electromagnetic shielding sheet for wireless charging is different from that of embodiment 1 in that:
and the corrosive liquid in the S2 is a sodium hydroxide aqueous solution.
The pH of the aqueous sodium hydroxide solution was 8.5.
The strong electrolyte solution is an aqueous sodium hydroxide solution.
2. A high-performance electromagnetic shielding sheet for wireless charging is obtained by the preparation method.
Performance testing
The target magnetic permeability of the electromagnetic shielding sheets obtained in example 1 and example 2 was the same and was 1400.
Sample treatment: the same FPC coils were assembled with the electromagnetic shielding sheets obtained in examples 1 to 8, and performance tests were performed thereon to compare the differences in performance.
1. Permeability (u ') and imaginary permeability (u'): as shown in the following table
TABLE 1 permeability (u ') and imaginary permeability (u') test results
2. LCR performance test at 100 kHz: ls (series inductance value), rs (series resistance value), rdc (direct current resistance value), Q (quality factor): as shown in the following table
TABLE 2 LCR Performance at 100kHz test results
3. And (3) testing the charging efficiency: as shown in the following table
Table 3 charging efficiency test results
Through comparison, the magnetic conductive sheets obtained in the embodiment 1 and the embodiment 2 have the advantages of lower imaginary part magnetic conductivity u', lower loss, lower Rs value, higher Q value and charging efficiency and better performance.
Claims (10)
1. A preparation process of a high-performance electromagnetic shielding sheet for wireless charging is characterized by comprising the following steps:
s1, material selection: selecting a soft magnetic strip as a magnetic material of the magnetic conducting sheet, and selecting a double-sided adhesive tape as bonding and bearing;
s2, soft magnetic strip processing: carrying out corrosion treatment on the surface of the soft magnetic strip by using a corrosive liquid, removing a surface stress layer, and then cleaning and drying;
s3, winding: winding the soft magnetic strip obtained in the step S2 into a small coil for the use of the subsequent process;
s4, heat treatment: placing the small coil of soft magnetic strip coiled in the step S3 into a heat treatment furnace for heat treatment, and then cooling to room temperature;
s5, laminating: carrying out single-side glue coating treatment on the soft magnetic strip obtained in the step S4;
s6, multilayer laminating: gluing the glued surface of the strip obtained in the step (S5) with the non-glued surface of the other roll of strip to obtain the electromagnetic shielding sheet coiled material;
s7, multilayer magnetic crushing: performing magnetic crushing treatment on the electromagnetic shielding sheet coiled material attached in the S6 by using a magnetic crushing roller to obtain electromagnetic shielding sheet particles with different shapes, sizes and gaps, performing heating treatment and rolling treatment on the particles subjected to magnetic crushing, and cooling to room temperature to obtain an electromagnetic shielding sheet;
s8, die cutting: punching the electromagnetic shielding sheet in the S7 according to the size requirement to obtain the electromagnetic shielding sheet with the required size;
s9, assembling: and (5) attaching the electromagnetic shielding sheet shown in the step (S8) to the coil to obtain the final electromagnetic shielding sheet assembly.
2. The preparation process of the electromagnetic shielding sheet for high-performance wireless charging according to claim 1, wherein the soft magnetic strip is at least one selected from amorphous and nanocrystalline.
3. The preparation process of the electromagnetic shielding sheet for high-performance wireless charging according to claim 1 or 2, wherein the soft magnetic strip is nanocrystalline;
the nanocrystalline is selected from at least one of common nanocrystalline and high Bs nanocrystalline.
4. The process for preparing the electromagnetic shielding sheet for high-performance wireless charging according to claim 1, wherein the corrosive solution in S2 is at least one selected from the group consisting of an aqueous hydrochloric acid solution, a dilute sulfuric acid solution, an aqueous acetic acid solution, an aqueous oxalic acid solution, an aqueous phosphoric acid solution, an aqueous caustic soda solution, an aqueous potassium hydroxide solution, an aqueous sodium sulfate solution, an aqueous sodium carbonate solution, an aqueous sodium acetate solution, an aqueous sodium chloride solution and an aqueous potassium chloride solution.
5. The preparation process of the electromagnetic shielding sheet for high-performance wireless charging according to claim 1 or 4, wherein the corrosive liquid in S2 is a hydrochloric acid aqueous solution.
6. The preparation process of the electromagnetic shielding sheet for high-performance wireless charging according to claim 1, wherein the heat treatment in S4 comprises:
(1) Pretreatment: heating to 400-500 deg.c and maintaining at high temperature for 1-180 min;
(2) And (3) heat treatment: continuously heating to 500-650 deg.C, and maintaining at high temperature for 30-150 min.
7. The preparation process of the high-performance electromagnetic shielding sheet for wireless charging according to claim 1, wherein the coiled material of the S6 electromagnetic shielding sheet has a single-layer structure or a multi-layer structure;
the number of layers of the electromagnetic shielding sheet coiled material with the multilayer structure is 2-10.
8. The preparation process of the high-performance electromagnetic shielding sheet for wireless charging according to claim 1, wherein the particle size of the particles of the electromagnetic shielding sheet in S7 is 0.5um to 10mm;
and gaps among the particles of the electromagnetic shielding sheet in the S7 range from 2um to 20um.
9. The preparation process of the electromagnetic shielding sheet for high-performance wireless charging according to claim 1, wherein the heating treatment in S7 is carried out at a temperature of 60-150 ℃ for 0.1-10 min.
10. A high-performance electromagnetic shielding sheet for wireless charging, which is obtained by the production method according to any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117395978A (en) * | 2023-12-11 | 2024-01-12 | 杭州象限科技有限公司 | Heat-resistant nanocrystalline magnetic shielding material and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117395978A (en) * | 2023-12-11 | 2024-01-12 | 杭州象限科技有限公司 | Heat-resistant nanocrystalline magnetic shielding material and preparation method and application thereof |
| CN117395978B (en) * | 2023-12-11 | 2024-03-15 | 杭州象限科技有限公司 | Heat-resistant nanocrystalline magnetic shielding material and preparation method and application thereof |
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