Preparation method of flexible inductive electromagnetic energy harvesting device and its product and installation method

Abstract

The present invention relates to a preparation method of a flexible inductive electromagnetic energy harvesting device, its product, and installation method, and belongs to the technical field of preparation of energy harvesting devices. The present invention mainly applies a coating slurry containing magnetic nanopowders on both surfaces of a 75D / 144F ultrafine fiber polyester cloth base fabric, performs magnetron sputtering of copper to form a copper film pattern, bridges the copper film patterns on the two surfaces in sequence by sewing with conductive yarn, and then applies polyurethane glue to form a flexible inductive electromagnetic energy harvesting device with a magnetic base fabric as a flexible iron core and a copper film spiraled on both sides of the base fabric as a winding. The preparation method of the present invention is simple and easy to operate, and can prepare a fiber fabric with magnetic, flexible, and elastic properties that can be stretched tightly on the surface of a current-carrying circuit, thereby forming a new type of inductive electromagnetic energy harvesting device with the significant advantages of easy installation, the strongest magnetic field close to the surface of the current-carrying conductor, light weight, and good adaptability to different circuit shapes and shapes.

Description

Technical Field

[0001] The present invention belongs to the technical field of preparation of energy collection devices, and relates to a preparation method of a flexible induction electromagnetic energy collection device, a product thereof, and an installation method thereof. Background Art

[0002] With the convergence of power grid and internet technologies, the level of intelligence and digitization in power grids has significantly improved. The uniquely intelligent nature of smart grids relies on real-time, rapid feedback on various grid operating parameters, which relies on the deployment of a large number of smart sensors with diverse electrical monitoring capabilities. However, in existing power system environments, such as outdoor overhead transmission lines and substations, it is difficult to directly obtain the low-voltage DC power required by smart sensors. Furthermore, existing offline power supply solutions such as solar and wind power suffer from stability and reliability issues. Therefore, power supply issues for smart sensors have become a key bottleneck limiting their large-scale deployment and application. Capturing the dissipated energy unique to power grid environments and converting it into electrical energy to power sensors is an effective solution to this problem. The AC current generates a power-frequency magnetic field near the various current-carrying conductors in the power grid. Coils placed within these magnetic fields induce an AC voltage. Combined with subsequent rectification, voltage regulation, and energy storage circuits, a stable low-voltage DC voltage can be generated to power the sensors.

[0003] Currently, the specific implementation of the above method typically involves placing an iron core over current-carrying lines, such as overhead transmission lines and electrical equipment grounding wires, and winding a coil around the core. This allows an AC voltage to be induced at both ends of the coil. However, the iron core is typically made of magnetic metal and is heavy, posing a risk when hoisted onto the line and compromising the mechanical strength of the line. While a non-through-the-wire alternative approach, placing an iron core and coil around these current-carrying lines, can avoid direct contact with the lines, the coil is located at a certain distance from the current-carrying line, causing the magnetic field to decay rapidly and resulting in only very low magnetic field energy.

[0004] Therefore, to address the above problems, it is necessary to prepare a fiber fabric with magnetism, flexibility, and elasticity so that it can be stretched tightly on the surface of the current-carrying circuit to form a flexible iron core that is close to the surface of the circuit, and to prepare a metal copper film on the fabric to form a coil, thereby forming a new type of inductive electromagnetic energy harvesting device, which ultimately has the significant advantages of easy installation, the strongest magnetic field close to the surface of the current-carrying conductor, light weight, and good adaptability to different circuit shapes and runs. Summary of the Invention

[0005] In view of this, one of the objects of the present invention is to provide a method for preparing a flexible inductive electromagnetic energy harvesting device; a second object of the present invention is to provide a flexible inductive electromagnetic energy harvesting device; and a third object of the present invention is to provide a method for installing a flexible inductive electromagnetic energy harvesting device on a current-carrying conductor.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] 1. A method for preparing a flexible inductive electromagnetic energy harvesting device, the method comprising the following steps:

[0008] (1) Using 75D / 144F microfiber polyester fabric as a base fabric, the treated base fabric was obtained after plasma activation treatment;

[0009] (2) Adding magnetic nanopowder to the coating additive and stirring to mix them evenly to form a coating slurry;

[0010] (3) uniformly coating the coating slurry described in step (2) on both surfaces of the base fabric treated in step (1) to obtain a coated polyester fabric;

[0011] (4) After washing and drying the coated polyester cloth, magnetron sputtering copper material is performed on both surfaces to form copper film patterns on the two surfaces;

[0012] (5) The copper film patterns on both sides of the base fabric are sequentially bridged by sewing conductive yarn, and polyurethane glue is evenly applied to the bridged base fabric using a glue coating machine to form an insulating layer on the surface of the copper film. A flexible induction electromagnetic energy harvesting device with a magnetic base fabric as a flexible iron core and copper films spiraled on both sides of the base fabric as windings is obtained.

[0013] Preferably, in step (1), the process parameters of the plasma activation treatment are specifically: plasma output power is 100~300W, plasma treatment time is 2~5min, and the reaction gas of plasma treatment is at least one of O2, N2 or Ar.

[0014] Preferably, in step (1), the magnetic nanopowder is Fe3O4 magnetic nanoparticles or metal ion-doped Fe3O4 magnetic nanoparticles (M-Fe3O4), wherein the metal ions are any one or more of Co, Ni, Nd, La or Ce.

[0015] Further preferably, the Fe3O4 magnetic nanoparticles are prepared by a solvent thermal synthesis method, specifically: FeCl3∙6H2O is dissolved in (CH2OH)2, polyethylene glycol is added, and then a (CH2OH)2 solution containing CH3COONa is added dropwise, first stirring at a speed of 300~400r / min for 10~20min, then stirring at a speed of 100~200r / min for 30~40min, ultrasonically stirred at room temperature for 90~120min, and then stirred on a magnetic stirrer until completely dissolved, placed in a high-pressure reactor, reacted in a drying oven at 200~250℃ for 16~24h, cooled to room temperature, and then centrifuged repeatedly with distilled water and CH3CH2OH until the washing liquid and the product are completely separated to obtain a black precipitate, which is dried in an oven at 60~70℃ to obtain Fe3O4 magnetic nanoparticles;

[0016] The molar volume ratio of CH3COONa in the FeCl3∙6H2O, (CH2OH)2, polyethylene glycol and the (CH2OH)2 solution containing CH3COONa is 0.1:80:50:10, mol:mL:mol:mol.

[0017] Further preferably, the metal ion-doped Fe3O4 magnetic nanoparticles (M-Fe3O4) are prepared by a solvent thermal synthesis method, specifically: FeCl3∙6H2O and a salt containing M are dissolved in (CH2OH)2, polyethylene glycol is added, and then a (CH2OH)2 solution containing CH3COONa is added dropwise, first stirred at a speed of 300r / min for 10min, then stirred at a speed of 100r / min for 30min, ultrasonicated at room temperature for 90min-120min, and then stirred on a magnetic stirrer until completely dissolved, placed in a high-pressure reactor, reacted in a drying oven at 200-250°C for 16-24h, cooled to room temperature, and then centrifuged repeatedly with distilled water and CH3CH2OH until the washing liquid and the product are completely separated to obtain a black precipitate, which is dried in an oven at 60°C-70°C to obtain Fe3O4 magnetic nanoparticles;

[0018] The molar volume ratio of FeCl3∙6H2O, M in the M-containing salt, (CH2OH)2, polyethylene glycol, and CH3COONa in the (CH2OH)2 solution containing CH3COONa is 0.1:0.01:80:50:10, mol:mol:mL:mol:mol;

[0019] When M is Co, Nd, Ce or La, the salt containing M is M x Cl y When M is Ni, the salt containing M is Ni(NO3)2·6H2O.

[0020] Preferably, in step (2), the coating additive comprises 10-30 wt.% adhesive, 5-20 wt.% thickener, 5-25 wt.% dispersant, 5-10 wt.% stabilizer and 5-10 wt.% penetrant;

[0021] The mass ratio of water-based polyurethane to distilled water in the adhesive is 1:50, the thickener is polyacrylamide, the dispersant is LBD-1, the stabilizer is TiO2, and the penetrant A is dioctyl sodium succinate.

[0022] Preferably, in step (4), the washing and drying treatment is specifically as follows: drying the coated polyester cloth at 60-70°C for 8-10 minutes, washing for 8-10 minutes, and then drying at 60-70°C for 8-10 minutes.

[0023] Preferably, in step (4), the specific method of the magnetron sputtering is:

[0024] S1: placing a base fabric and a target material in a high vacuum multifunctional magnetron sputtering device and fixing them, wherein the target material is a 99.999% pure Cu target;

[0025] S2: Evacuate the bottom of the equipment until the pressure inside the equipment is 1.5×10 -3 When Pa, open the argon gas tank and adjust the argon flow rate to 100~200cm 3 / min;

[0026] S3: Turn on the RF power supply and preheat for 5 minutes. After the ignition is generated, adjust the RF power and then fine-tune the vacuum chamber pressure to 0.8~1.2×10 -4 Pa;

[0027] S4: Open the base cloth baffle and the target baffle to start magnetron sputtering until the copper film coating is completed;

[0028] S5: Turn off the RF source, flow display valve control, flow display, gas inlet valve, molecular pump, vacuum valve, mechanical pump, and vacuum compound meter;

[0029] S6: Open the air inlet valve, open the vacuum chamber cover, take out the sputtered base cloth, close the argon gas tank, and repeat the above steps S1 to S5 according to the actual required copper film thickness for multiple sputtering.

[0030] 2. A flexible inductive electromagnetic energy harvesting device prepared according to the above preparation method.

[0031] 3. The method for installing the flexible inductive electromagnetic energy harvesting device on a current-carrying conductor includes method 1 or method 2, specifically as follows:

[0032] Method 1: The flexible inductive electromagnetic energy harvesting device is tightly wound and wrapped around the current-carrying conductor in a spiral winding manner. Depending on the specific induced voltage and the electromagnetic energy required to be obtained, a multi-layer back-and-forth winding method is adopted. The beginning and end of the fabric strips in the flexible inductive electromagnetic energy harvesting device are bonded with fabric glue or tape to achieve close attachment to the surface of the current-carrying conductor.

[0033] Method 2: Wrap the entire roll of the above-mentioned flexible induction electromagnetic energy harvesting device directly on the current-carrying conductor. According to the specific induced voltage and the required electromagnetic energy requirements, multi-layer wrapping is used. The head and tail of the cloth strip in the flexible induction electromagnetic energy harvesting device are bonded with cloth glue or tape to complete the tight mounting on the surface of the current-carrying conductor.

[0034] The beneficial effects of the present invention are as follows: the present invention discloses a method for preparing a flexible inductive electromagnetic energy harvesting device, which mainly comprises applying a coating slurry containing magnetic nanopowder to both surfaces of a 75D / 144F ultrafine fiber polyester fabric, magnetron sputtering copper to form a copper film pattern, sequentially bridging the copper film patterns on the two surfaces by sewing conductive yarn, and then applying polyurethane glue to form a flexible inductive electromagnetic energy harvesting device with a magnetic fabric as a flexible iron core and a copper film spiraled on both surfaces of the fabric as a winding. The preparation method of the present invention is simple and easy to operate, and the preparation method of the present invention can prepare a fiber fabric with magnetic, flexible, and elastic properties that can be tightly stretched on the surface of a current-carrying circuit to form a flexible iron core that closely adheres to the circuit surface, and a method of preparing a metal copper film on the fabric to form a coil, thereby forming a novel inductive electromagnetic energy harvesting device with the significant advantages of easy installation, the strongest magnetic field close to the surface of the current-carrying conductor, light weight, and good adaptability to different circuit shapes and shapes.

[0035] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0037] Figure 1 This is a schematic diagram of the installation of spiral winding;

[0038] Figure 2 This is a diagram for direct packaging installation. DETAILED DESCRIPTION

[0039] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0040] The specific method of magnetron sputtering in the following embodiment is as follows: S1: placing the base fabric and the target material in a high vacuum multifunctional magnetron sputtering device and fixing them, wherein the target material is a 99.999% pure Cu target;

[0041] S2: Evacuate the bottom of the equipment until the pressure inside the equipment is 1.5×10 -3 Pa, open the argon gas tank and adjust the argon flow rate to the required value (100~200cm 3 / min);

[0042] S3: Turn on the RF power supply and preheat for 5 minutes. After the ignition is generated, adjust the RF power and then fine-tune the vacuum chamber pressure to the required value (0.8~1.2×10 -4 Pa range);

[0043] S4: Open the base cloth baffle and the target baffle to start magnetron sputtering until the copper film coating is completed;

[0044] S5: Turn off the RF source, flow display valve control, flow display, gas inlet valve, molecular pump, vacuum valve, mechanical pump, and vacuum compound meter;

[0045] S6: Open the air inlet valve, open the vacuum chamber cover, take out the sputtered base cloth, close the argon gas tank, and repeat the above steps S1 to S5 according to the actual required copper film thickness for multiple sputtering.

[0046] Example 1

[0047] A method for preparing a flexible inductive electromagnetic energy harvesting device comprises the following steps:

[0048] (1) 75D / 144F microfiber polyester fabric was used as a base fabric and subjected to plasma activation treatment (the process parameters of the plasma activation treatment were as follows: plasma output power of 100 W, plasma treatment time of 5 min, and plasma treatment reaction gas of O2) to obtain the treated base fabric;

[0049] (2) Fe3O4 magnetic nanoparticles (FeCl3∙6H2O was dissolved in (CH2OH)2, polyethylene glycol was added, and then (CH2OH)2 solution containing CH3COONa was added dropwise. The mixture was stirred at a speed of 300-400 r / min for 10-20 min, and then stirred at a speed of 100-200 r / min for 30-40 min. Ultrasonication was performed at room temperature for 90 min-120 min, and then stirred on a magnetic stirrer until it was completely dissolved. The mixture was placed in a high-pressure reactor and reacted in a drying oven at 200°C for 16 h. After cooling to room temperature, the mixture was repeatedly centrifuged with distilled water and CH3CH2OH until the washing liquid and the product were completely separated to obtain a black precipitate. The mixture was dried in an oven at 60°C to obtain Fe3O4 magnetic nanoparticles. The molar volume ratio of CH3COONa in the FeCl3∙6H2O, (CH2OH)2, polyethylene glycol and (CH2OH)2 solution containing CH3COONa was 0. .1:80:50:10, mol:mL:mol:mol) as magnetic nanopowder is added to a coating additive (the coating additive comprises 10 wt.% adhesive, 20 wt.% thickener, 5 wt.% dispersant, 10 wt.% stabilizer and 5 wt.% penetrant A, wherein the mass ratio of waterborne polyurethane to distilled water in the adhesive is 1:50, the thickener is polyacrylamide, the dispersant is LBD-1, the stabilizer is TiO2, and the penetrant A is dioctyl sodium sulfosuccinate), and stirred to mix uniformly to form a coating slurry;

[0050] (3) uniformly coating the coating slurry described in step (2) on both surfaces of the base fabric treated in step (1) to obtain a coated polyester fabric;

[0051] (4) The coated polyester cloth is washed and dried (the coated polyester cloth is dried at 60° C. for 8 minutes, washed for 10 minutes, and then dried at 60° C. for 8 minutes). Then, copper is magnetron sputtered on both surfaces to form copper film patterns on the two surfaces;

[0052] (5) The copper film patterns on both sides of the base fabric are bridged in sequence by sewing conductive yarn, and polyurethane glue is evenly applied to the bridged base fabric using a glue coating machine to form an insulating layer on the surface of the copper film. A flexible inductive electromagnetic energy harvesting device with a magnetic base fabric as a flexible iron core and copper films spiraled on both sides of the base fabric as windings is obtained.

[0053] Example 2

[0054] A method for preparing a flexible inductive electromagnetic energy harvesting device comprises the following steps:

[0055] The process parameters of the plasma activation treatment in Example 1 were modified from “plasma output power of 100 W, plasma treatment time of 5 min, and plasma treatment reaction gas of O2” to “plasma output power of 300 W, plasma treatment time of 2 min, and plasma treatment reaction gas of N2”; “Fe3O4 magnetic nanoparticles (FeCl3∙6H2O dissolved in (CH2OH)2” were modified to “Ni-doped Fe3O4 magnetic nanoparticles (M-Fe3O4), (FeCl3∙6H2O and Ni(NO3)2·6H2O dissolved in (CH2OH)2”; and “wherein the molar volume ratio of FeCl3∙6H2O, (CH2OH)2, polyethylene glycol, and CH3COONa in the (CH2OH)2 solution containing CH3COONa is 0.1:80:50:10, mol:mL:mol:mol)” were modified to “FeCl3∙6H2O, Ni(NO3)2· 6H2O, (CH2OH)2, polyethylene glycol and the molar volume ratio of CH3COONa of the (CH2OH)2 solution containing CH3COONa is 0.1:0.01:80:50:10, mol:mol:mL:mol:mol)", and the “coating aid (the composition of the coating aid is 10wt.% adhesive, 20wt.% thickener, 5wt.% dispersant, 10wt.% stabilizer and 5wt.% penetrant A, wherein the mass ratio of aqueous polyurethane to distilled water in the adhesive is 1:50” is modified to “coating aid (the composition of the coating aid is 30wt.% adhesive, 5wt.% thickener, 25wt.% dispersant, 5wt.% stabilizer and 10wt.% penetrant A, wherein the mass ratio of aqueous polyurethane to distilled water in the adhesive is 1:50", and the remaining steps are the same as in Example 1.

[0056] Example 3

[0057] A method for preparing a flexible inductive electromagnetic energy harvesting device comprises the following steps:

[0058] The process parameters of the plasma activation treatment in Example 1 were modified from "plasma output power of 100 W, plasma treatment time of 5 min, and plasma treatment reaction gas of O2" to "plasma output power of 200 W, plasma treatment time of 4 min, and plasma treatment reaction gas of Ar", and "Fe3O4 magnetic nanoparticles (FeCl3∙6H2O dissolved in (CH2OH)2)" to "Co-doped Fe3O4 magnetic nanoparticles (M-Fe3O4) (FeCl3∙6H2O and CoCl2 dissolved in (CH2OH)2)," and "wherein the molar volume ratio of FeCl3∙6H2O, (CH2OH)2, polyethylene glycol, and CH3COONa in the (CH2OH)2 solution containing CH3COONa is 0.1:80:50:10, mol:mL:mol:mol). ” was modified to “the molar volume ratio of CH3COONa in the (CH2OH)2 solution containing CH3COONa, FeCl3∙6H2O, CoCl2, (CH2OH)2, polyethylene glycol, and CH3COONa is 0.1:0.01:80:50:10, mol:mol:mL:mol:mol)”, and “coating aid (the coating aid comprises 10 wt.% adhesive, 20 wt.% thickener, 5 wt.% dispersant, 10 wt.% stabilizer, and 5 wt.% penetrant A, wherein the mass ratio of aqueous polyurethane to distilled water in the adhesive is 1:50” was modified to “coating aid (the coating aid comprises 20 wt.% adhesive, 15 wt.% thickener, 15 wt.% dispersant, 8 wt.% stabilizer, and 8 wt.% penetrant A, wherein the mass ratio of aqueous polyurethane to distilled water in the adhesive is 1:50”. The remaining steps were the same as those in Example 1.

[0059] Example 4

[0060] A method for preparing a flexible inductive electromagnetic energy harvesting device comprises the following steps:

[0061] The “Fe3O4 magnetic nanoparticles (FeCl3∙6H2O is dissolved in (CH2OH)2)” in Example 1 is modified to “Nd-doped Fe3O4 magnetic nanoparticles (M-Fe3O4), (FeCl3∙6H2O and NdCl3 are dissolved in (CH2OH)2),” and “wherein the molar volume ratio of CH3COONa of FeCl3∙6H2O, (CH2OH)2, polyethylene glycol, and the (CH2OH)2 solution containing CH3COONa is 0.1:80:50:10, mol:mL:mol:mol)” is modified to “the molar volume ratio of CH3COONa of FeCl3∙6H2O, NdCl3, (CH2OH)2, polyethylene glycol, and the (CH2OH)2 solution containing CH3COONa is 0.1:0.01:80:50:10, mol:mol:mL:mol:mol)”, and the remaining steps are the same as in Example 1.

[0062] Example 5

[0063] A method for preparing a flexible inductive electromagnetic energy harvesting device comprises the following steps:

[0064] The “Fe3O4 magnetic nanoparticles (FeCl3∙6H2O is dissolved in (CH2OH)2)” in Example 1 is modified to “Ce-doped Fe3O4 magnetic nanoparticles (MM-Fe3O4), (FeCl3∙6H2O and CeCl4 are dissolved in (CH2OH)2),” and “wherein the molar volume ratio of CH3COONa of FeCl3∙6H2O, (CH2OH)2, polyethylene glycol, and the (CH2OH)2 solution containing CH3COONa is 0.1:80:50:10, mol:mL:mol:mol)” is modified to “the molar volume ratio of CH3COONa of FeCl3∙6H2O, CeCl4, (CH2OH)2, polyethylene glycol, and the (CH2OH)2 solution containing CH3COONa is 0.1:0.01:80:50:10, mol:mol:mL:mol:mol)”, and the remaining steps are the same as in Example 1.

[0065] Example 6

[0066] A method for preparing a flexible inductive electromagnetic energy harvesting device comprises the following steps:

[0067] The “Fe3O4 magnetic nanoparticles (FeCl3∙6H2O is dissolved in (CH2OH)2)” in Example 1 is modified to “La-doped Fe3O4 magnetic nanoparticles (MM-Fe3O4), (FeCl3∙6H2O and LaCl3 are dissolved in (CH2OH)2),” and “wherein the molar volume ratio of CH3COONa of FeCl3∙6H2O, (CH2OH)2, polyethylene glycol, and the (CH2OH)2 solution containing CH3COONa is 0.1:80:50:10, mol:mL:mol:mol)” is modified to “the molar volume ratio of CH3COONa of FeCl3∙6H2O, LaCl3, (CH2OH)2, polyethylene glycol, and the (CH2OH)2 solution containing CH3COONa is 0.1:0.01:80:50:10, mol:mol:mL:mol:mol)”, and the remaining steps are the same as in Example 1.

[0068] Performance Testing

[0069] 1. The flexible inductive electromagnetic energy harvesting device prepared in Examples 1 to 5 above is mounted on a current-carrying conductor. The specific method is as follows:

[0070] The flexible inductive electromagnetic energy harvesting devices prepared in Examples 1 to 5 are respectively tightened and tightly wound on the current-carrying wire in a spiral winding manner. Depending on the specific induced voltage and the electromagnetic energy required to be obtained, a multi-layer back-and-forth winding manner can be adopted. The head and tail of the cloth strip in the flexible inductive electromagnetic energy harvesting device are bonded with cloth glue or tape to complete the close attachment to the surface of the current-carrying wire (such as Figure 1 shown).

[0071] The installed current-carrying conductor has the significant advantages of being easy to install, having the strongest magnetic field close to the surface of the current-carrying conductor, being light in weight, and being well adaptable to different line shapes and runs.

[0072] 2. The flexible inductive electromagnetic energy harvesting devices prepared in Examples 1 to 5 above are respectively installed on current-carrying wires. The specific method is as follows:

[0073] The flexible inductive electromagnetic energy harvesting device prepared in the above-mentioned Examples 1 to 5 is directly wrapped on the current-carrying wire. According to the specific induced voltage and the electromagnetic energy required to be obtained, multi-layer wrapping can be used. The head and tail of the cloth strip in the flexible inductive electromagnetic energy harvesting device are bonded with cloth glue or tape to complete the close attachment on the surface of the current-carrying wire (such as Figure 2 shown).

[0074] In summary, the present invention discloses a method for preparing a flexible inductive electromagnetic energy harvesting device, which mainly comprises applying a coating slurry containing magnetic nanopowders to both surfaces of a 75D / 144F ultrafine fiber polyester fabric, performing magnetron sputtering of copper to form a copper film pattern, sequentially bridging the copper film patterns on the two surfaces by sewing conductive yarn, and then applying polyurethane glue to form a flexible inductive electromagnetic energy harvesting device with a magnetic fabric as a flexible iron core and a copper film spiraled on both surfaces of the fabric as a winding. The preparation method of the present invention is simple and easy to operate, and the preparation method of the present invention can prepare a fiber fabric with magnetic, flexible, and elastic properties that can be stretched tightly on the surface of a current-carrying circuit to form a flexible iron core that closely adheres to the circuit surface, and preparing a metal copper film on the fabric to form a coil, thereby forming a new type of inductive electromagnetic energy harvesting device with the significant advantages of easy installation, the strongest magnetic field close to the surface of the current-carrying conductor, light weight, and good adaptability to different circuit shapes and shapes.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for preparing a flexible inductive electromagnetic energy harvesting device, characterized in that: The preparation method comprises the following steps: (1) Using 75D / 144F microfiber polyester fabric as a base fabric, the treated base fabric was obtained after plasma activation treatment; (2) Adding magnetic nanopowder to the coating additive and stirring to mix them evenly to form a coating slurry; (3) uniformly coating the coating slurry described in step (2) on both surfaces of the base fabric treated in step (1) to obtain a coated polyester fabric; (4) After washing and drying the coated polyester cloth, magnetron sputtering copper material is performed on both surfaces to form copper film patterns on the two surfaces; (5) The copper film patterns on both sides of the base fabric are sequentially bridged by sewing conductive yarn, and polyurethane glue is evenly applied to the bridged base fabric using a glue coating machine to form an insulating layer on the surface of the copper film. A flexible induction electromagnetic energy harvesting device with a magnetic base fabric as a flexible iron core and copper films spiraled on both sides of the base fabric as windings is obtained.

2. The preparation method according to claim 1, characterized in that In step (1), the process parameters of the plasma activation treatment are specifically as follows: plasma output power is 100-300 W, plasma treatment time is 2-5 min, and the reaction gas of the plasma treatment is at least one of O2, N2 or Ar.

3. The preparation method according to claim 1, characterized in that In step (2), the magnetic nanopowder is Fe3O4 magnetic nanoparticles or Fe3O4 magnetic nanoparticles doped with metal ions, wherein the metal ions are any one or more of Co, Ni, Nd, La or Ce.

4. The preparation method according to claim 3, characterized in that The Fe3O4 magnetic nanoparticles are prepared by a solvent thermal synthesis method, specifically: FeCl3∙6H2O is dissolved in (CH2OH)2, polyethylene glycol is added, and then a (CH2OH)2 solution containing CH3COONa is added dropwise, first stirring at a speed of 300-400 r / min for 10-20 min, then stirring at a speed of 100-200 r / min for 30-40 min, ultrasonicating at room temperature for 90-120 min, and then stirring on a magnetic stirrer until completely dissolved, placing in a high-pressure reactor, reacting in a drying oven at 200-250°C for 16-24 h, cooling to room temperature, and then repeatedly centrifuging with distilled water and CH3CH2OH until the washing liquid and the product are completely separated to obtain a black precipitate, which is then dried in an oven at 60-70°C to obtain Fe3O4 magnetic nanoparticles; The molar volume ratio of CH3COONa in the FeCl3∙6H2O, (CH2OH)2, polyethylene glycol and the (CH2OH)2 solution containing CH3COONa is 0.1:80:50:10, mol:mL:mol:mol.

5. The preparation method according to claim 3, characterized in that The metal ion-doped Fe3O4 magnetic nanoparticles are prepared by a solvent thermal synthesis method, specifically: FeCl3∙6H2O and a salt containing M are dissolved in (CH2OH)2, polyethylene glycol is added, and then a (CH2OH)2 solution containing CH3COONa is added dropwise, and the mixture is stirred at a speed of 300 r / min for 10 minutes, then at a speed of 100 r / min for 30 minutes, and then ultrasonicated at room temperature for 90 minutes to 120 minutes, and then stirred on a magnetic stirrer until completely dissolved, placed in a high-pressure reactor, reacted in a drying oven at 200-250°C for 16-24 hours, cooled to room temperature, and then centrifuged repeatedly with distilled water and CH3CH2OH until the washing liquid and the product are completely separated to obtain a black precipitate, which is then dried in an oven at 60-70°C to obtain Fe3O4 magnetic nanoparticles; The molar volume ratio of FeCl3∙6H2O, M in the M-containing salt, (CH2OH)2, polyethylene glycol, and CH3COONa in the (CH2OH)2 solution containing CH3COONa is 0.1:0.01:80:50:10, mol:mol:mL:mol:mol; When M is Co, Nd, Ce or La, the salt containing M is M x Cl y When M is Ni, the salt containing M is Ni(NO3)2·6H2O.

6. The preparation method according to claim 1, characterized in that In step (2), the coating additive comprises 10-30 wt.% of an adhesive, 5-20 wt.% of a thickener, 5-25 wt.% of a dispersant, 5-10 wt.% of a stabilizer, and 5-10 wt.% of a penetrant; The mass ratio of water-based polyurethane to distilled water in the adhesive is 1:50, the thickener is polyacrylamide, the dispersant is LBD-1, the stabilizer is TiO2, and the penetrant A is dioctyl sodium succinate.

7. The preparation method according to claim 1, characterized in that In step (4), the washing and drying treatment is specifically as follows: drying the coated polyester fabric at 60-70°C for 8-10 minutes, washing for 8-10 minutes, and then drying at 60-70°C for 8-10 minutes.

8. The preparation method according to claim 1, characterized in that In step (4), the specific method of the magnetron sputtering is: S1: placing a base fabric and a target material in a high vacuum multifunctional magnetron sputtering device and fixing them, wherein the target material is a 99.999% pure Cu target; S2: Evacuate the bottom of the equipment until the pressure inside the equipment is 1.5×10 -3 When Pa, open the argon gas tank and adjust the argon flow rate to 100~200cm 3 / min; S3: Turn on the RF power supply and preheat for 5 minutes. After the ignition is generated, adjust the RF power and then fine-tune the vacuum chamber pressure to 0.8~1.2×10 -4 Pa; S4: Open the base cloth baffle and the target baffle to start magnetron sputtering until the copper film coating is completed; S5: Turn off the RF source, flow display valve control, flow display, gas inlet valve, molecular pump, vacuum valve, mechanical pump, and vacuum compound meter; S6: Open the air inlet valve, open the vacuum chamber cover, take out the sputtered base cloth, close the argon gas tank, and repeat the above steps S1 to S5 according to the actual required copper film thickness for multiple sputtering.

9. A flexible induction electromagnetic energy harvesting device prepared according to the preparation method according to any one of claims 1 to 8.

10. The method for installing the flexible inductive electromagnetic energy harvesting device on a current-carrying conductor according to claim 9, characterized in that: The installation method includes method one or method two, which are as follows: Method 1: The flexible inductive electromagnetic energy harvesting device according to claim 9 is tightened and tightly wound around the current-carrying conductor by spiral winding. Depending on the specific induced voltage and the electromagnetic energy required to be obtained, a multi-layer back-and-forth winding method can be adopted. The head and tail of the cloth strip in the flexible inductive electromagnetic energy harvesting device are bonded with cloth glue or tape to achieve close attachment to the surface of the current-carrying conductor. Method 2: Wrap the entire roll of the flexible induction electromagnetic energy harvesting device described in claim 9 directly on the current-carrying conductor, and use multi-layer wrapping according to the specific induced voltage and the required electromagnetic energy requirements. The head and tail of the cloth strip in the flexible induction electromagnetic energy harvesting device are bonded with cloth glue or tape to complete close mounting on the surface of the current-carrying conductor.

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