CN115249574A - Nanocrystalline magnetic separation sheet for wireless charging and preparation method thereof - Google Patents
Nanocrystalline magnetic separation sheet for wireless charging and preparation method thereof Download PDFInfo
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- CN115249574A CN115249574A CN202211029900.XA CN202211029900A CN115249574A CN 115249574 A CN115249574 A CN 115249574A CN 202211029900 A CN202211029900 A CN 202211029900A CN 115249574 A CN115249574 A CN 115249574A
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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
- H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
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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
- H01F41/0233—Manufacturing of magnetic circuits made from sheets
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention provides a nanocrystalline magnetic isolation sheet for wireless charging and a preparation method thereof, wherein the preparation method comprises the following steps: carrying out multilayer bonding after carrying out insulation treatment on the single-layer nanocrystalline strip to obtain a multilayer nanocrystalline strip; punching the multilayer nanocrystalline strip to obtain holes which are uniformly distributed on the surface of the multilayer nanocrystalline strip; performing gum dipping treatment on the punched multilayer nanocrystalline strip to form an insulating protective film on the surface of the nanocrystalline strip; and cutting the multilayer nanocrystalline strip material subjected to the gum dipping treatment into magnetic strips to obtain nanocrystalline magnetically isolating sheets which are longitudinally arranged at intervals. According to the invention, the nanocrystalline strip is subjected to punching and gum dipping treatment, is divided into different areas, the integrity of the nanocrystalline strip is damaged, and the integral insulation is realized, so that the eddy current loss on the surface of the nanocrystalline strip is reduced, and the nanocrystalline magnetism isolating sheets are arranged at intervals, so that the heating in the charging process is better reduced, and the wireless charging efficiency is improved; the method is simple to operate, low in cost and wide in application range.
Description
Technical Field
The invention belongs to the technical field of wireless charging, and relates to a nanocrystalline magnetism isolating 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 concerned in recent years, and has wide application prospects in the fields of consumer electronics, electric automobiles, smart homes, robots and the like. The wireless charging technology needs to be developed from short distance to long distance and from low power to high power, so that the performance requirement on wireless charging is higher and higher, but in the present, the technical performance indexes such as system efficiency, electromagnetic environment and the like always limit the large-scale popularization and application of the wireless charging technology.
The wireless charging technology establishes corresponding electromagnetic fields through high-frequency resonant current flowing in a transmitting end coil and a receiving end coil and performs mutual coupling in space, so that efficient non-contact transmission of electric energy is realized. The magnetic conduction structure is usually a magnetic core or a magnetic conduction sheet, so that electromagnetic field coupling of a working area can be increased, and the transmission power and efficiency of the system are improved; meanwhile, the electromagnetic field intensity of an adjacent non-working area is reduced, and the electromagnetic influence of a wireless charging process on surrounding equipment or organisms is reduced.
At present, a magnetic conduction structure of a wireless charging system is mainly formed by splicing square ferrite materials, such as soft magnetic ferrite, but when the magnetic conduction body is used for high-power wireless charging, the magnetic conduction body is large in size, heavy in equipment and fragile in texture, and is not suitable for mobile vehicles; the other type of usable magnetic conductive material is mainly a nanocrystalline material, which is applied to wireless charging modules such as mobile phones with low power, but for high-power application scenarios, the nanocrystalline strip material is prone to generating the problems of serious loss and heat generation, so that the energy transfer efficiency of a wireless charging system is affected.
CN 112289578A discloses a magnetic stripe-shaped nanocrystalline magnetism isolating sheet, a preparation method and an application thereof, wherein the method comprises the following steps: sequentially cutting the nanocrystalline strip, dipping the double surfaces of the nanocrystalline strip with glue, drying and curing the nanocrystalline strip, performing heat treatment on the nanocrystalline strip, curing the cured glue, drying the nanocrystalline strip and cutting the nanocrystalline strip to obtain the nanocrystalline magnetic isolating sheet; in the method, the insulation between the nanocrystalline strips is ensured by coating the double surfaces of the nanocrystalline strips, but the integral eddy current of the nanocrystalline magnetism isolating sheet with the strip-shaped structure is still large, and the problems of eddy current loss and heating are still high particularly in the length direction.
CN 210694778U discloses a nanocrystalline electromagnetic shielding material for high-power wireless charging of an automobile, which is formed by sticking and laminating a plurality of layers of large-size wide nanocrystalline soft magnetic shielding sheets in a mutually orthogonal vertical arrangement and distribution mode through double-sided adhesive tapes, and black PI films are respectively stuck on the front surface of the bottommost nanocrystalline soft magnetic shielding sheet and the back surface of the topmost nanocrystalline soft magnetic shielding sheet; each layer of large-size wide-width nanocrystalline soft magnetic separation sheet is formed by splicing a plurality of long-strip small-width nanocrystalline soft magnetic separation tapes in a seamless parallel arrangement mode, and the peripheral edge of each layer of large-size wide-width nanocrystalline soft magnetic separation sheet is in a vertical bending structure along the outer edge of the coil panel; the nanocrystalline electromagnetic shielding material with the structure is larger in magnetic field intensity in a wireless charging system in a high-power application scene, and a tiled nanocrystalline strip can generate eddy current loss on the surface of the strip, so that the strip is seriously lost, the heating problem is generated, and the charging efficiency is influenced.
In summary, in the case that the nanocrystalline magnetic separator is used for high-power wireless charging, the structure of the nanocrystalline strip needs to be improved, so that the surface eddy current loss is reduced, the problem of serious loss of the nanocrystalline strip is solved, heat is generated in a bottom charging layer, and the charging efficiency is improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a nanocrystalline magnetism isolating sheet for wireless charging and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the invention provides a preparation method of a nanocrystalline magnetism isolating sheet for wireless charging, which comprises the following steps:
(1) Carrying out multilayer adhesion after the single-layer nanocrystalline strip is subjected to insulation treatment to obtain a multilayer nanocrystalline strip;
(2) Carrying out punching treatment on the multilayer nanocrystalline strip obtained in the step (1), wherein obtained holes are uniformly distributed on the surface of the multilayer nanocrystalline strip;
(3) Performing gum dipping treatment on the punched multilayer nanocrystalline strip material in the step (2) to form an insulating protective film on the surface of the nanocrystalline strip material;
(4) Cutting the multilayer nanocrystalline strip treated by the gum dipping in the step (3) into magnetic strips to obtain nanocrystalline magnetically isolating sheets, wherein the nanocrystalline magnetically isolating sheets are longitudinally arranged at intervals.
According to the invention, when the nanocrystalline magnetic separation sheet is used for wireless charging, especially high-power charging, the integrity of the nanocrystalline strip can be damaged by punching after the nanocrystalline strip is subjected to multilayer adhesion, the nanocrystalline strip is divided into different areas, the integral insulation is realized by insulation gum dipping treatment, and the loss of surface eddy current can be effectively reduced during application; the cut nanocrystalline magnetic shielding sheets are arranged at intervals, so that large-area magnetic shielding sheets are avoided, eddy current loss can be further reduced, heating in the charging process is reduced, and the wireless charging efficiency is improved; the method is simple to operate, remarkable in effect, low in cost and wide in application range.
The following technical solutions are preferred technical solutions of the present invention, but not limited to the technical solutions provided by the present invention, and technical objects and advantageous effects of the present invention can be better achieved and achieved by the following technical solutions.
As a preferable technical solution of the present invention, the nanocrystalline strip in step (1) includes an iron-based nanocrystalline strip.
In the invention, the iron-based nanocrystalline strip is composed of iron-based nanocrystalline alloy, and the iron-based nanocrystalline alloy is an alloy which is mainly composed of iron and added with a small amount of niobium, copper, silicon and boron.
Preferably, the insulation treatment in step (1) is performed by: and adhering insulating adhesive tapes to the two sides of the nanocrystalline strip.
As a preferable technical scheme of the invention, the mode of bonding the multiple layers of nanocrystalline tapes in the step (1) is to bond the tapes by adopting a transparent double-sided adhesive tape.
Preferably, the number of layers of the multi-layer nanocrystalline ribbon in step (1) is 10 to 120, for example, 10, 20, 40, 60, 80, 100 or 120 layers, etc., but not limited to the recited values, and other non-recited integers in the range of the values are also applicable.
Preferably, the thickness of the multi-layer nanocrystalline strip in step (1) is 0.2-5 mm, such as 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 4mm, or 5mm, but is not limited to the recited values, and other values not recited in the range of values are also applicable.
As a preferable technical solution of the present invention, the punching process in the step (2) is: and forming a through hole on the surface of the multilayer nanocrystalline strip.
Preferably, the diameter of the through-hole is 0.1 to 3mm, for example 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm, but is not limited to the recited values, and other values not recited within the range of values are also applicable.
Preferably, the total cross-sectional area of the holes accounts for 60% to 80%, such as 60%, 65%, 70%, 75%, or 80%, of the area of the multi-layer nanocrystalline ribbon, but is not limited to the recited values, and other values not recited within this range are equally applicable.
As a preferable technical solution of the present invention, the dipping treatment in the step (3) is: and (3) immersing the multilayer nanocrystalline strip into an insulating glue solution.
Preferably, the insulating glue solution comprises an aqueous inorganic nano solution, a modifier and a film-forming aid.
Preferably, the aqueous inorganic nano-solution comprises any one of or a combination of at least two of silica sol, aluminum sol, titanium sol, magnesium sol or calcium sol, typical but non-limiting examples of which are: a combination of silica sol and aluminum sol, a combination of aluminum sol and titanium sol, a combination of titanium sol, magnesium sol and calcium sol, a combination of silica sol, aluminum sol and magnesium sol, and the like.
Preferably, the modifier comprises a silane coupling agent and/or a surfactant.
In the present invention, the silane coupling agent includes a siloxane compound containing an epoxy group, such as gamma-glycidoxypropyltrimethoxysilane; the surfactant comprises polyvinyl alcohol or a polyether-siloxane copolymer.
Preferably, the coalescent includes any one of, or a combination of at least two of, an acrylic resin, a polyurethane, a styrene-acrylic resin, or an epoxy resin, as typical but non-limiting examples: combinations of acrylic and polyurethane, polyurethane and styrene-acrylic, styrene-acrylic and epoxy, acrylic, polyurethane and epoxy, and the like.
As a preferred technical scheme of the invention, the preparation method of the insulating glue solution comprises the following steps: adding the film forming assistant and the modifier into the aqueous inorganic nano solution, and then stirring and mixing.
Preferably, the mixing time is 0.5 to 5 hours, for example 0.5 hour, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 3.5 hours, 4 hours or 5 hours, but is not limited to the recited values, and other values not recited in the range of the values are also applicable, preferably 2 to 4 hours.
Preferably, the temperature of the stirring and mixing is 15 to 40 ℃, for example, 15 ℃, 20 ℃, 25 ℃, 30 ℃, 35 ℃ or 40 ℃, but is not limited to the recited values, and other values not recited in the range of the values are also applicable, preferably 20 to 30 ℃.
In a preferred embodiment of the present invention, in the dipping treatment in step (3), the multilayer nanocrystalline ribbon stays in the insulating paste for 0.1 to 50 seconds, for example, 0.1s, 1s, 5s, 10s, 20s, 30s, 40s, or 50s, but the present invention is not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable.
Preferably, a drying treatment is performed after the dipping treatment in the step (3).
Preferably, the temperature of the drying treatment is 25 to 40 ℃, for example, 25 ℃, 30 ℃, 35 ℃ or 40 ℃, but not limited to the recited values, and other values not recited in the range of the values are also applicable; the drying time is 0.1-20 min, such as 0.1min, 1min, 3min, 5min, 8min, 10min, 12min, 15min or 20min, but not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the thickness of the insulating protective film in step (3) is 2 to 5 μm, for example, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, or 5 μm, but is not limited to the recited values, and other values not recited in the numerical range are also applicable.
As a preferable technical scheme of the invention, the size of the cut magnetic stripe-shaped nanocrystalline magnetism isolating sheet in the step (4) is as follows: a length of 100 to 500mm, such as 100mm, 200mm, 300mm, 400mm or 500mm, etc., a width of 1 to 5mm, such as 1mm, 2mm, 3mm, 4mm or 5mm, etc., and a thickness of 0.2 to 5mm, such as 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 4mm or 5mm, etc.; however, the numerical values recited are not intended to be limiting, and other numerical values not recited within the respective numerical ranges are also applicable.
Preferably, the nanocrystalline magnetism isolating sheets in the step (4) are longitudinally and parallelly paved on the magnetism isolating plate at intervals.
In the invention, the magnetism isolating plate is a structure formed by combining a receiving end coil and a magnetism isolating sheet and is a necessary structure for wireless charging.
Preferably, the number of the nanocrystalline magnetically isolating sheets longitudinally spaced in step (4) is 15 to 500, for example, 15, 50, 100, 150, 200, 300, 400 or 500, etc., but the number is not limited to the enumerated values, and other non-enumerated values within the respective numerical ranges are also applicable.
Preferably, the spacing between two adjacent nanocrystalline magnetically isolating sheets in step (4) is not greater than 3mm, such as 3mm, 2.5mm, 2mm, 1.5mm, 1mm or 0.5mm, but is not limited to the values recited, and other values not recited in this range are equally applicable.
As a preferred technical scheme of the invention, the preparation method comprises the following steps:
(1) Carrying out multilayer adhesion after carrying out insulation treatment on a single-layer nanocrystalline strip, wherein the nanocrystalline strip comprises an iron-based nanocrystalline strip, and the insulation treatment mode is as follows: adhering insulating adhesive tapes to both sides of the nanocrystalline strip in a manner of adopting transparent double-sided adhesive tapes to adhere to obtain a multilayer nanocrystalline strip, wherein the number of layers of the multilayer nanocrystalline strip is 10-120, and the thickness of the multilayer nanocrystalline strip is 0.2-5 mm;
(2) Carrying out punching treatment on the multilayer nanocrystalline strip obtained in the step (1), wherein the punching treatment comprises the following steps: forming through holes on the surface of the multilayer nanocrystalline strip, wherein the diameter of each through hole is 0.1-3 mm, the total cross-sectional area of the holes accounts for 60-80% of the area of the multilayer nanocrystalline strip, and the obtained holes are uniformly distributed on the surface of the multilayer nanocrystalline strip;
(3) Performing impregnation treatment on the punched multilayer nanocrystalline strip in the step (2), wherein the impregnation treatment comprises the following steps: immersing a multilayer nanocrystalline strip into an insulating glue solution, wherein the insulating glue solution comprises an aqueous inorganic nano solution, a modifier and a film-forming additive, the multilayer nanocrystalline strip stays in the insulating glue solution for 0.1-50 s, drying is carried out after the glue dipping treatment, the drying temperature is 25-40 ℃, the drying time is 0.1-20 min, an insulating protective film is formed on the surface of the nanocrystalline strip, and the thickness of the insulating protective film is 2-5 mu m;
(4) Cutting the multilayer nanocrystalline strip processed by the gum dipping treatment in the step (3) into a magnetic strip shape to obtain a nanocrystalline magnetic separation sheet, wherein the size of the cut magnetic strip-shaped nanocrystalline magnetic separation sheet is as follows: the length is 100-500 mm, the width is 1-5 mm, and the thickness is 0.2-5 mm; the nanocrystalline magnetism isolating sheets are longitudinally paved on the magnetism isolating plate at intervals in parallel, the number of the nanocrystalline magnetism isolating sheets is 15-500, and the distance between every two adjacent nanocrystalline magnetism isolating sheets is not more than 3mm.
On the other hand, the invention also provides the nanocrystalline magnetism isolating sheet for wireless charging, which is obtained by adopting the preparation method.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the preparation method, the nanocrystalline strip is subjected to punching and gum dipping treatment, the nanocrystalline strip is divided into different areas, the integrity of the nanocrystalline strip is damaged, and the integral insulation is realized, so that the eddy current loss on the surface of the nanocrystalline strip is reduced, and the nanocrystalline magnetic shielding sheets are arranged at intervals, so that the heating in the charging process is better reduced, and the wireless charging efficiency is improved;
(2) The method disclosed by the invention is simple to operate, remarkable in effect, lower in cost and wide in application range.
Drawings
Fig. 1 is a schematic structural diagram of a punched multi-layer nanocrystalline strip provided in example 1 of the present invention.
Detailed Description
In order to better illustrate the present invention and facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. However, the following examples are only simple examples of the present invention and do not represent or limit the scope of the present invention, which is defined by the claims.
The specific embodiment of the invention provides a preparation method of a nanocrystalline magnetic shield sheet for wireless charging, which comprises the following steps:
(1) Carrying out multilayer adhesion after the single-layer nanocrystalline strip is subjected to insulation treatment to obtain a multilayer nanocrystalline strip;
(2) Carrying out punching treatment on the multilayer nanocrystalline strip obtained in the step (1), wherein obtained holes are uniformly distributed on the surface of the multilayer nanocrystalline strip;
(3) Performing gum dipping treatment on the punched multilayer nanocrystalline strip in the step (2) to form an insulating protective film on the surface of the nanocrystalline strip;
(4) Cutting the multilayer nanocrystalline strip treated by the gum dipping in the step (3) into magnetic strips to obtain nanocrystalline magnetically isolating sheets, wherein the nanocrystalline magnetically isolating sheets are longitudinally arranged at intervals.
The following are typical but non-limiting examples of the invention:
example 1:
the embodiment provides a preparation method of a nanocrystalline magnetism isolating sheet for wireless charging, which comprises the following steps:
(1) Carrying out multilayer adhesion after carrying out insulation treatment on a single-layer nanocrystalline strip, wherein the nanocrystalline strip is an iron-based nanocrystalline strip, and the insulation treatment mode is as follows: adhering insulating adhesive tapes to both sides of the nanocrystalline strip in a manner of adopting transparent double-sided adhesive tapes to adhere to obtain a multilayer nanocrystalline strip, wherein the number of layers of the multilayer nanocrystalline strip is 72, and the thickness of the multilayer nanocrystalline strip is 3mm;
(2) Carrying out punching treatment on the multilayer nanocrystalline strip obtained in the step (1), wherein the punching treatment comprises the following steps: forming through holes on the surface of the multilayer nanocrystalline strip, wherein the diameter of each through hole is 2mm, the total cross-sectional area of each through hole accounts for 70% of the area of the multilayer nanocrystalline strip, the obtained holes are uniformly distributed on the surface of the multilayer nanocrystalline strip, and the structural schematic diagram is shown in fig. 1;
(3) Performing impregnation treatment on the punched multilayer nanocrystalline strip in the step (2), wherein the impregnation treatment comprises the following steps: immersing a multilayer nanocrystalline strip into an insulating glue solution, wherein the insulating glue solution comprises a water-based inorganic nano solution, a modifier and a film-forming auxiliary agent, the water-based inorganic nano solution is silica sol, the modifier is a silane coupling agent, the film-forming auxiliary agent comprises acrylic resin, the multilayer nanocrystalline strip stays in the insulating glue solution for 20s, the multilayer nanocrystalline strip is dried after the glue dipping treatment, the drying treatment is carried out at the temperature of 30 ℃ for 5min, an insulating protective film is formed on the surface of the nanocrystalline strip, and the thickness of the insulating protective film is 3 mu m;
(4) Cutting the multilayer nanocrystalline strip processed by the gum dipping treatment in the step (3) into a magnetic strip shape to obtain a nanocrystalline magnetic separation sheet, wherein the size of the cut magnetic strip-shaped nanocrystalline magnetic separation sheet is as follows: 390mm in length, 3mm in width and 3mm in thickness; the nanocrystalline magnetism isolating sheets are longitudinally paved on the magnetism isolating plate of the wireless charging receiving end at intervals in parallel, the number of the nanocrystalline magnetism isolating sheets is 200, and the distance between every two adjacent nanocrystalline magnetism isolating sheets is 1.5mm.
Example 2:
the embodiment provides a preparation method of a nanocrystalline magnetism isolating sheet for wireless charging, which comprises the following steps:
(1) Carrying out multilayer adhesion after insulating treatment on a single-layer nanocrystalline strip, wherein the nanocrystalline strip is an iron-based nanocrystalline strip, and the insulating treatment mode is as follows: adhering insulating adhesive tapes to both sides of the nanocrystalline strip in a manner of adopting transparent double-sided adhesive tapes to adhere to obtain a multilayer nanocrystalline strip, wherein the number of layers of the multilayer nanocrystalline strip is 100, and the thickness of the multilayer nanocrystalline strip is 3.5mm;
(2) Carrying out punching treatment on the multilayer nanocrystalline strip obtained in the step (1), wherein the punching treatment comprises the following steps: forming through holes on the surface of the multilayer nanocrystalline strip, wherein the diameter of each through hole is 2mm, the total cross section area of each through hole accounts for 80% of the area of the multilayer nanocrystalline strip, and the obtained through holes are uniformly distributed on the surface of the multilayer nanocrystalline strip;
(3) Performing impregnation treatment on the punched multilayer nanocrystalline strip in the step (2), wherein the impregnation treatment comprises the following steps: immersing a multilayer nanocrystalline strip into an insulating glue solution, wherein the insulating glue solution comprises a water-based inorganic nano solution, a modifier and a film-forming auxiliary agent, the water-based inorganic nano solution is titanium sol, the modifier is a silane coupling agent, the film-forming auxiliary agent comprises polyurethane, the multilayer nanocrystalline strip stays in the insulating glue solution for 30s, the multilayer nanocrystalline strip is dried after the glue dipping treatment, the drying treatment is carried out at the temperature of 25 ℃ for 15min, an insulating protective film is formed on the surface of the nanocrystalline strip, and the thickness of the insulating protective film is 2.5 mu m;
(4) Cutting the multilayer nanocrystalline strip subjected to gum dipping treatment in the step (3) into a magnetic strip shape to obtain a nanocrystalline magnetic isolation sheet, wherein the size of the cut magnetic strip-shaped nanocrystalline magnetic isolation sheet is as follows: 390mm in length, 3.8mm in width and 3.5mm in thickness; nanocrystalline magnetism screen piece longitudinal separation parallel is laid on the magnetism screen of wireless receiving terminal that charges, and quantity is 300, and the interval of two adjacent nanocrystalline magnetism screens is 1mm.
Example 3:
the embodiment provides a preparation method of a nanocrystalline magnetism isolating sheet for wireless charging, which comprises the following steps:
(1) Carrying out multilayer adhesion after insulating treatment on a single-layer nanocrystalline strip, wherein the nanocrystalline strip is an iron-based nanocrystalline strip, and the insulating treatment mode is as follows: adhering insulating adhesive tapes to both sides of the nanocrystalline strip in a manner of adopting transparent double-sided adhesive tapes to adhere to obtain a multilayer nanocrystalline strip, wherein the number of layers of the multilayer nanocrystalline strip is 30, and the thickness of the multilayer nanocrystalline strip is 1mm;
(2) Carrying out punching treatment on the multilayer nanocrystalline strip obtained in the step (1), wherein the punching treatment comprises the following steps: forming through holes on the surface of the multilayer nanocrystalline strip, wherein the diameter of each through hole is 3mm, the total cross section area of each through hole accounts for 60% of the area of the multilayer nanocrystalline strip, and the obtained through holes are uniformly distributed on the surface of the multilayer nanocrystalline strip;
(3) Performing impregnation treatment on the punched multilayer nanocrystalline strip in the step (2), wherein the impregnation treatment comprises the following steps: immersing a multilayer nanocrystalline strip into an insulating glue solution, wherein the insulating glue solution comprises an aqueous inorganic nano solution, a modifier and a film-forming assistant, the aqueous inorganic nano solution is an aluminum sol, the modifier is a surfactant, the film-forming assistant comprises styrene-acrylic resin, the multilayer nanocrystalline strip stays in the insulating glue solution for 10s, drying is carried out after the impregnation treatment, the drying temperature is 40 ℃, the drying time is 2min, an insulating protective film is formed on the surface of the nanocrystalline strip, and the thickness of the insulating protective film is 4 mu m;
(4) Cutting the multilayer nanocrystalline strip processed by the gum dipping treatment in the step (3) into a magnetic strip shape to obtain a nanocrystalline magnetic separation sheet, wherein the size of the cut magnetic strip-shaped nanocrystalline magnetic separation sheet is as follows: 390mm in length, 3.8mm in width and 1mm in thickness; nanocrystalline magnetism screen piece longitudinal separation parallel is laid on the magnetism screen of wireless receiving terminal that charges, and quantity is 50, and the interval of two adjacent nanocrystalline magnetism screens is 2mm.
Example 4:
the embodiment provides a preparation method of a nanocrystalline magnetic shielding sheet for wireless charging, which comprises the following steps:
(1) Carrying out multilayer adhesion after insulating treatment on a single-layer nanocrystalline strip, wherein the nanocrystalline strip is an iron-based nanocrystalline strip, and the insulating treatment mode is as follows: adhering insulating adhesive tapes to both sides of the nanocrystalline strip in a manner of adhering by adopting transparent double-sided adhesive tapes to obtain a multilayer nanocrystalline strip, wherein the number of layers of the multilayer nanocrystalline strip is 120, and the thickness of the multilayer nanocrystalline strip is 4mm;
(2) Carrying out punching treatment on the multilayer nanocrystalline strip obtained in the step (1), wherein the punching treatment comprises the following steps: forming through holes on the surface of the multilayer nanocrystalline strip, wherein the diameter of each through hole is 1mm, the total cross section area of each through hole accounts for 75% of the area of the multilayer nanocrystalline strip, and the obtained through holes are uniformly distributed on the surface of the multilayer nanocrystalline strip;
(3) Performing impregnation treatment on the punched multilayer nanocrystalline strip in the step (2), wherein the impregnation treatment comprises the following steps: immersing a multilayer nanocrystalline strip into an insulating glue solution, wherein the insulating glue solution comprises a water-based inorganic nano solution, a modifier and a film-forming auxiliary agent, the water-based inorganic nano solution is silica sol, the modifier is a surfactant, the film-forming auxiliary agent comprises epoxy resin, the multilayer nanocrystalline strip stays in the insulating glue solution for 40s, the multilayer nanocrystalline strip is dried after the glue dipping treatment, the drying treatment is carried out at the temperature of 35 ℃ for 8min, an insulating protective film is formed on the surface of the nanocrystalline strip, and the thickness of the insulating protective film is 2 mu m;
(4) Cutting the multilayer nanocrystalline strip processed by the gum dipping treatment in the step (3) into a magnetic strip shape to obtain a nanocrystalline magnetic separation sheet, wherein the size of the cut magnetic strip-shaped nanocrystalline magnetic separation sheet is as follows: the length is 500mm, the width is 4mm, and the thickness is 4mm; the nanocrystalline magnetism isolating sheets are longitudinally paved on the magnetism isolating plate of the wireless charging receiving end at intervals in parallel, the number of the nanocrystalline magnetism isolating sheets is 400, and the distance between every two adjacent nanocrystalline magnetism isolating sheets is 2.5mm.
Example 5:
the embodiment provides a preparation method of a nanocrystalline magnetism isolating sheet for wireless charging, which comprises the following steps:
(1) Carrying out multilayer adhesion after insulating treatment on a single-layer nanocrystalline strip, wherein the nanocrystalline strip is an iron-based nanocrystalline strip, and the insulating treatment mode is as follows: adhering insulating adhesive tapes to both sides of the nanocrystalline strip in a manner of adopting transparent double-sided adhesive tapes to adhere to obtain a multilayer nanocrystalline strip, wherein the number of layers of the multilayer nanocrystalline strip is 50, and the thickness of the multilayer nanocrystalline strip is 2mm;
(2) Carrying out punching treatment on the multilayer nanocrystalline strip obtained in the step (1), wherein the punching treatment comprises the following steps: forming through holes on the surface of the multilayer nanocrystalline strip, wherein the diameter of each through hole is 0.5mm, the total cross section area of each through hole accounts for 65% of the area of the multilayer nanocrystalline strip, and the obtained through holes are uniformly distributed on the surface of the multilayer nanocrystalline strip;
(3) Performing impregnation treatment on the punched multilayer nanocrystalline strip in the step (2), wherein the impregnation treatment comprises the following steps: immersing a multilayer nanocrystalline strip into an insulating glue solution, wherein the insulating glue solution comprises an aqueous inorganic nano solution, a modifier and a film-forming assistant, the aqueous inorganic nano solution is calcium sol, the modifier is a silane coupling agent, the film-forming assistant comprises acrylic resin, the multilayer nanocrystalline strip stays in the insulating glue solution for 50s, drying is carried out after the glue dipping treatment, the drying temperature is 30 ℃, the drying time is 10min, an insulating protective film is formed on the surface of the nanocrystalline strip, and the thickness of the insulating protective film is 5 mu m;
(4) Cutting the multilayer nanocrystalline strip processed by the gum dipping treatment in the step (3) into a magnetic strip shape to obtain a nanocrystalline magnetic separation sheet, wherein the size of the cut magnetic strip-shaped nanocrystalline magnetic separation sheet is as follows: the length is 200mm, the width is 2.5mm, and the thickness is 2mm; the nanocrystalline magnetism isolating sheets are longitudinally paved on the magnetism isolating plate of the wireless charging receiving end at intervals in parallel, the number of the nanocrystalline magnetism isolating sheets is 500, and the distance between every two adjacent nanocrystalline magnetism isolating sheets is 0.5mm.
Comparative example 1:
this comparative example provides a method for producing a nanocrystalline magnetic separator sheet for wireless charging, which is a method referred to in example 1, except that: the punching process of step (2) is not performed.
Comparative example 2:
the comparative example adopts 3 layers of MS700 nanocrystalline as the nanocrystalline magnetism isolating sheet for wireless charging.
The magnetic permeability of the magnetic separator sheets of examples 1 to 5 and comparative examples 1 to 2 was measured; the magnetic shield sheets of examples 1 to 5 and comparative examples 1 to 2 were placed on the magnetic shield sheet of the wireless charging receiving terminal, and the charging efficiency and the heat generation were measured, and the results are shown in table 1.
TABLE 1 results of testing charging efficiency and heat generation condition of the magnetism-insulating sheets in examples 1 to 5 and comparative examples 1 to 2
As can be seen from table 1, the nanocrystalline magnetism insulator for wireless charging provided in embodiments 1 to 5 of the present invention can reduce eddy current loss, reduce heat generation during charging, and give good consideration to charging efficiency; in the comparative example 1, as the punching treatment is not carried out, the structure of the nanocrystalline magnetism isolating sheet is relatively complete, so that the surface eddy current loss is relatively large compared with that of the embodiment, the system efficiency after the operation is 90.31%, and the surface temperature is 65 ℃; in comparative example 2, when the MS700 nanocrystalline material was used, the charging efficiency was high but the temperature after charging was too high, which could reach 112 ℃, and the loss was large.
It can be seen from the above examples and comparative examples that the preparation method of the present invention breaks the nanocrystalline strip into different regions by punching and gumming the nanocrystalline strip, destroys the integrity of the nanocrystalline strip, and realizes integral insulation, thereby reducing eddy current loss on the surface of the nanocrystalline strip, and further reducing heat generation during charging and improving wireless charging efficiency by spacing arrangement of the nanocrystalline magnetically isolating sheets; the method is simple to operate, remarkable in effect, low in cost and wide in application range.
The present invention is illustrated in detail by the examples described above, but the present invention is not limited to the details described above, i.e., it is not intended that the present invention be implemented by relying on the details described above. It will be apparent to those skilled in the art that any modifications to the present invention, equivalents of the method of the present invention and additions of ancillary steps, selection of specific means, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A preparation method of a nanocrystalline magnetism isolating sheet for wireless charging is characterized by comprising the following steps:
(1) Carrying out multilayer adhesion after the single-layer nanocrystalline strip is subjected to insulation treatment to obtain a multilayer nanocrystalline strip;
(2) Carrying out punching treatment on the multilayer nanocrystalline strip obtained in the step (1), wherein obtained holes are uniformly distributed on the surface of the multilayer nanocrystalline strip;
(3) Performing gum dipping treatment on the punched multilayer nanocrystalline strip in the step (2) to form an insulating protective film on the surface of the nanocrystalline strip;
(4) Cutting the multilayer nanocrystalline strip treated by the gum dipping in the step (3) into magnetic strips to obtain nanocrystalline magnetically isolating sheets, wherein the nanocrystalline magnetically isolating sheets are longitudinally arranged at intervals.
2. The method of claim 1, wherein the nanocrystalline ribbon of step (1) comprises an iron-based nanocrystalline ribbon;
preferably, the insulation treatment in step (1) is performed by: and adhering insulating adhesive tapes to the two sides of the nanocrystalline strip.
3. The preparation method according to claim 1 or 2, wherein the bonding between the multi-layer nanocrystalline tapes in step (1) is performed by using a transparent double-sided adhesive tape;
preferably, the number of layers of the multilayer nanocrystalline strip in the step (1) is 10-120;
preferably, the thickness of the multi-layer nanocrystalline strip in the step (1) is 0.2-5 mm.
4. The production method according to any one of claims 1 to 3, wherein the punching process of step (2) is: forming a through hole on the surface of the multilayer nanocrystalline strip;
preferably, the diameter of the through hole is 0.1-3 mm;
preferably, the total cross-sectional area of the holes accounts for 60-80% of the area of the multi-layer nanocrystalline strip.
5. The production method according to any one of claims 1 to 4, wherein the impregnation treatment in step (3) is: immersing the multilayer nanocrystalline strip into insulating glue solution;
preferably, the insulating glue solution comprises a water-based inorganic nano solution, a modifier and a film-forming assistant;
preferably, the aqueous inorganic nano solution comprises any one of or a combination of at least two of silica sol, aluminum sol, titanium sol, magnesium sol or calcium sol;
preferably, the modifier comprises a silane coupling agent and/or a surfactant;
preferably, the film forming aid comprises any one of acrylic resin, polyurethane, styrene-acrylic resin or epoxy resin or a combination of at least two of the acrylic resin, the polyurethane, the styrene-acrylic resin or the epoxy resin.
6. The preparation method according to claim 5, characterized in that the preparation method of the insulating glue solution comprises: adding a film-forming assistant and a modifier into the aqueous inorganic nano solution, and then stirring and mixing;
preferably, the stirring and mixing time is 0.5-5 h, preferably 2-4 h;
preferably, the temperature of the stirring and mixing is 15 to 40 ℃, preferably 20 to 30 ℃.
7. The preparation method according to any one of claims 1 to 6, wherein the multilayer nanocrystalline strip stays in the insulating glue solution for 0.1 to 50s during the dipping treatment in the step (3);
preferably, after the gum dipping treatment in the step (3), drying treatment is carried out;
preferably, the drying treatment temperature is 25-40 ℃, and the drying time is 0.1-20 min;
preferably, the thickness of the insulating protective film in the step (3) is 2 to 5 μm.
8. The preparation method according to any one of claims 1 to 7, wherein the sizes of the cut magnetic stripe-shaped nanocrystalline magnetism isolating sheet in the step (4) are as follows: the length is 100-500 mm, the width is 1-5 mm, and the thickness is 0.2-5 mm;
preferably, the nanocrystalline magnetism isolating sheets in the step (4) are longitudinally paved on the magnetism isolating plate at intervals in parallel;
preferably, the number of the nanocrystalline magnetic separation sheets longitudinally arranged at intervals in the step (4) is 15-500;
preferably, the distance between two adjacent nanocrystalline magnetism isolating sheets in the step (4) is not more than 3mm.
9. The method of any one of claims 1 to 8, comprising the steps of:
(1) Carrying out multilayer adhesion after carrying out insulation treatment on a single-layer nanocrystalline strip, wherein the nanocrystalline strip comprises an iron-based nanocrystalline strip, and the insulation treatment mode is as follows: adhering insulating adhesive tapes to both sides of the nanocrystalline strip in a manner of adopting transparent double-sided adhesive tapes to adhere to obtain a multilayer nanocrystalline strip, wherein the number of layers of the multilayer nanocrystalline strip is 10-120, and the thickness of the multilayer nanocrystalline strip is 0.2-5 mm;
(2) Carrying out punching treatment on the multilayer nanocrystalline strip obtained in the step (1), wherein the punching treatment comprises the following steps: forming through holes on the surface of the multilayer nanocrystalline strip, wherein the diameter of each through hole is 0.1-3 mm, the total cross-sectional area of the holes accounts for 60-80% of the area of the multilayer nanocrystalline strip, and the obtained holes are uniformly distributed on the surface of the multilayer nanocrystalline strip;
(3) Performing impregnation treatment on the punched multilayer nanocrystalline strip in the step (2), wherein the impregnation treatment comprises the following steps: immersing a multilayer nanocrystalline strip into an insulating glue solution, wherein the insulating glue solution comprises an aqueous inorganic nano solution, a modifier and a film-forming additive, the multilayer nanocrystalline strip stays in the insulating glue solution for 0.1-50 s, drying is carried out after the glue dipping treatment, the drying temperature is 25-40 ℃, the drying time is 0.1-20 min, an insulating protective film is formed on the surface of the nanocrystalline strip, and the thickness of the insulating protective film is 2-5 mu m;
(4) Cutting the multilayer nanocrystalline strip processed by the gum dipping treatment in the step (3) into a magnetic strip shape to obtain a nanocrystalline magnetic separation sheet, wherein the size of the cut magnetic strip-shaped nanocrystalline magnetic separation sheet is as follows: the length is 100-500 mm, the width is 1-5 mm, and the thickness is 0.2-5 mm; the nanocrystalline magnetism isolating sheets are longitudinally paved on the magnetism isolating plate at intervals in parallel, the number of the nanocrystalline magnetism isolating sheets is 15-500, and the distance between every two adjacent nanocrystalline magnetism isolating sheets is not more than 3mm.
10. A nanocrystalline magnetic separator for wireless charging obtained by the preparation method according to any one of claims 1 to 9.
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| WO2024119734A1 (en) * | 2022-12-08 | 2024-06-13 | 横店集团东磁股份有限公司 | Magnetic shielding structure and manufacturing method therefor, and wireless charging system |
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| WO2024119734A1 (en) * | 2022-12-08 | 2024-06-13 | 横店集团东磁股份有限公司 | Magnetic shielding structure and manufacturing method therefor, and wireless charging system |
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