CN117612764A - Energy storage cable and preparation method thereof - Google Patents

Energy storage cable and preparation method thereof Download PDF

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Publication number
CN117612764A
CN117612764A CN202311526776.2A CN202311526776A CN117612764A CN 117612764 A CN117612764 A CN 117612764A CN 202311526776 A CN202311526776 A CN 202311526776A CN 117612764 A CN117612764 A CN 117612764A
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Prior art keywords
temperature
silicone rubber
methyl vinyl
vinyl silicone
aluminum
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Inventor
张东杰
王雪松
杨景云
胡旭明
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Jiangsu Shangshang Cable Group Co Ltd
Jiangsu Shangshang Cable Group New Material Co Ltd
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Jiangsu Shangshang Cable Group Co Ltd
Jiangsu Shangshang Cable Group New Material Co Ltd
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Priority to CN202311526776.2A priority Critical patent/CN117612764A/en
Publication of CN117612764A publication Critical patent/CN117612764A/en
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H01B1/023—Alloys based on aluminium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/14—Insulating conductors or cables by extrusion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
    • H01B13/2606—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by braiding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention provides an energy storage cable and a preparation method thereof, wherein the energy storage cable sequentially comprises an aluminum conductor, an insulating layer and a braiding layer from inside to outside; the preparation raw materials of the insulating layer comprise the following components: methyl vinyl silicone rubber, white carbon black, a structure control agent, a release agent, a color paste, a vulcanizing agent, a stabilizer and an auxiliary agent. The energy storage cable has the advantages of low cost, light weight, excellent ageing resistance, flame retardance, battery acid resistance, low temperature resistance, high flexibility and high electrical property, and excellent comprehensive performance, and can meet the use requirements of the energy storage cable.

Description

Energy storage cable and preparation method thereof
Technical Field
The invention belongs to the technical field of cables, and relates to an energy storage cable and a preparation method thereof.
Background
The energy storage is the key point for solving the high permeability of renewable clean energy, in the global scale of the put-in energy storage project, the electrochemical energy storage accumulation scale is changed to the second place, wherein the battery accumulation installation gauge is maximum and takes up 92 percent, and the electrochemical energy storage accumulation scale is used as an energy storage cable with the battery connected with the inside like a blood vessel and a nerve, so the market is also very popular.
CN116759152a discloses a long-life environment-friendly energy storage cable, which comprises a cable core, an intermediate layer, a moisture absorption layer, a flame retardant layer and a protective sleeve layer, wherein the cable core, the intermediate layer, the moisture absorption layer, the flame retardant layer and the protective sleeve layer are sequentially arranged from inside to outside, the number of the cable cores is three, and the three cable cores have the same structure and are distributed in the intermediate layer at equal angles and are all coated by the intermediate layer; the waterproof belt is provided with the moisture absorption layer, so that external water can be prevented from entering the inside in a radial mode, and when the waterproof belt is damaged, the waterproof rope can expand after meeting water, and the water entering the inside is prevented from being longitudinally diffused to two sides. However, the design scheme of the energy storage cable adopts a copper core conductor, taking 250A as an example, and the section of the designed conductor is designed to be 70mm 2 The single equipment is expected to use the cable 100 meters, the limited market price of the copper core cable repeatedly fluctuates, and the purchasing cost, the manufacturing cost, the transportation cost and the maintenance cost are not dominant.
In addition, two insulating materials PVC and XLPO are defined in the existing energy storage standard, the limited energy storage electric control cabinet has the problem of narrow space, and the local insulating skin of the cable with overlarge bending angle is wrinkled and whitened; the required material in the energy storage standard meets the requirement of 125 ℃ for 20000 hours, the required temperature index is not lower than 125 ℃ through the derivation of an Arrhenius regression curve, the actual measurement of the XLPO material at the temperature of 125 ℃ is 124.8 ℃, and the upper limit of the polyolefin material is reached.
In summary, according to the operating condition and the use characteristics, designing an energy storage cable with low cost, long life, high electrical property and high flexibility is a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide an energy storage cable and a preparation method thereof, wherein the energy storage cable is low in cost, light in weight, excellent in ageing resistance, flame retardance, battery acidity resistance, low temperature resistance, high flexibility and high electrical property, and excellent in comprehensive performance, and can meet the use requirements of the energy storage cable.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
The invention provides an energy storage cable which sequentially comprises an aluminum conductor, an insulating layer and a braiding layer from inside to outside;
the preparation raw materials of the insulating layer comprise the following components: methyl vinyl silicone rubber, white carbon black, a structure control agent, a release agent, a color paste, a vulcanizing agent, a stabilizer and an auxiliary agent.
According to the energy storage cable provided by the invention, the light aluminum conductor is adopted to replace a copper conductor, so that the production cost and the cable weight are reduced, and the flexibility is improved; meanwhile, the formula of the insulating layer material with high flexibility, long service life and high electrical property is designed, and the braided layer is adopted as the cable reinforced composite structure layer, so that the cable can bear weather resistance, salt spray resistance, temperature and humidity alternation resistance, flame retardance and other complex acid-base working conditions.
As a preferable technical scheme of the invention, the preparation method of the aluminum conductor comprises the following steps: and smelting, casting, drawing and wiredrawing the aluminum ingot in sequence to obtain aluminum monofilaments, bundling a plurality of aluminum monofilaments into an aluminum strand, and twisting to obtain the aluminum conductor.
The aluminum conductor material of the invention comprises any one of 1370 type aluminum, 1350 type aluminum or 8030 type aluminum.
The applicant compares the current carrying current temperature rise test of the actual copper cable and the aluminum cable at different environmental temperatures, and takes 250A as an example, the original copper core cable is 70mm 2 The current carrying is 250A when the temperature rises to 40 ℃, and the aluminum core cable is adopted for 95mm 2 The current carrying is 250A when the temperature rises to 40 ℃, and substitution can be realized under the same current temperature rise. By contrast of bending flexibility, taking 250A as an example, the original copper core cable is 70mm 2 The bending force of the flexibility test is 100N, and an aluminum core cable with the thickness of 95mm is adopted 2 The bending force of the flexibility test is 45N, the bending force is reduced by 50% after the aluminum core cable is used for replacing the cable, and the flexibility is improved.
The melting temperature is preferably 800 to 850 ℃, and may be, for example, 805 ℃, 810 ℃, 815 ℃, 820 ℃, 825 ℃, 830 ℃, 835 ℃, 840 ℃, 845 ℃, or the like, but is not limited to the values listed, and other values not listed in the range are equally applicable.
The casting temperature is preferably 700 to 750 ℃, and may be 705 ℃, 710 ℃, 715 ℃, 720 ℃, 725 ℃, 730 ℃, 735 ℃, 740 ℃, 745 ℃, or the like, for example, but is not limited to the recited values, and other non-recited values within the range are equally applicable.
The aluminum filaments preferably have a diameter of 0.41 to 0.52mm, for example, 0.42mm, 0.43mm, 0.45mm, 0.47mm, 0.49mm, 0.50mm, or 0.51mm, but the present invention is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned range are applicable.
Preferably, the elongation of the aluminum filaments is not less than 14%, for example, 15%, 17%, 19%, 20%, 22%, 25% or 27%, etc., but not limited to the values recited, and other values not recited in the range are equally applicable, preferably not less than 18%.
In the invention, the elongation of the aluminum monofilaments meets the flexible bending requirement of the cable.
Preferably, the aluminum monofilaments have a conductivity of at least 62% IACS, for example, 64% IACS, 65% IACS, 67% IACS, 70% IACS, or 72% IACS, but the present invention is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are equally applicable.
The tensile strength of the aluminum filaments is preferably 75 to 120MPa, and may be, for example, 80MPa, 85MPa, 90MPa, 95MPa, 100MPa, 105MPa, 110MPa, 115MPa, or the like, but is not limited to the values recited, and other values not recited in the numerical range are similarly applicable.
Preferably, the binding direction is right.
Preferably, the directions of the twisting of the adjacent layers of aluminum strands are opposite, and the outermost layer is left-hand.
Preferably, the twisting pitch of the outermost aluminum strands is no more than 14 times the outer diameter of the aluminum conductor after twisting.
As a preferable technical scheme of the invention, the methyl vinyl silicone rubber, the white carbon black, the structure control agent and the release agent form methyl vinyl silicone rubber compound.
Preferably, the mass content of the methyl vinyl silicone rubber in the methyl vinyl silicone rubber compound is 60-70%, the mass content of the white carbon black is 30-35%, the mass content of the structure control agent is 5-10%, and the mass content of the release agent is 0.1-1% based on the mass of the methyl vinyl silicone rubber compound.
In the invention, the primary open mixing amount of the methyl vinyl silicone rubber compound is 20kg.
In the present invention, the methyl vinyl silicone rubber may be, for example, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68% or 69% by mass of the methyl vinyl silicone rubber compound, the white carbon black may be, for example, 30.5%, 31%, 31.5%, 32%, 32.5%, 33%, 33.5%, 34% or 34.5% by mass of the methyl vinyl silicone rubber compound, the structure controlling agent may be, for example, 5% to 10% by mass of the methyl vinyl silicone rubber compound, 5.5%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9% or 9.5% by mass of the mold release agent may be, for example, 0.1% by mass of the methyl vinyl silicone rubber compound, for example, 1%, 2%, 3%, 4%, 6%, 7%, 9% by mass of the same, or other suitable values, but not limited to the range.
The amount of the colored rubber added is preferably 0.6% to 0.8% by mass of the methyl vinyl silicone rubber compound, and may be, for example, 0.62%, 0.65%, 0.67%, 0.69%, 0.7%, 0.72%, 0.75%, 0.77% or 0.79%, etc., but is not limited to the values recited, and other values not recited in the numerical range are equally applicable.
Preferably, the vulcanizing agent is added in an amount of 2.1 to 2.5% by mass of the methyl vinyl silicone rubber compound, for example, 2.15%, 2.2%, 2.25%, 2.3%, 2.35%, 2.4% or 2.45%, etc., but the vulcanizing agent is not limited to the recited values, and other non-recited values in the numerical range are equally applicable.
The stabilizer is preferably added in an amount of 0.8% to 1.5% by mass of the methyl vinyl silicone rubber compound, for example, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4% or 1.45%, etc., but is not limited to the recited values, and other non-recited values within the numerical range are equally applicable.
The addition amount of the auxiliary agent is preferably 2% to 2.5% by mass of the methyl vinyl silicone rubber compound, and may be, for example, 2.1%, 2.2%, 2.25%, 2.3%, 2.35%, 2.4% or 2.45%, etc., but is not limited to the recited values, and other values not recited in the numerical range are equally applicable.
As a preferred embodiment of the present invention, the methyl vinyl silicone rubber includes dimethyl methyl vinyl.
Preferably, the structure controlling agent comprises a hydroxy silicone oil.
Preferably, the release agent comprises zinc stearate.
According to the invention, the release agent is added into the raw material for preparing the insulating layer, so that the problem that aluminum monofilaments are adhered after the silicon rubber is vulcanized and the wire cutting cannot be stripped can be solved.
Preferably, the vulcanizing agent comprises an A-component catalyst and a B-component vulcanizing agent.
Preferably, the amount of the catalyst of the component A added is 0.8% to 1.0% by mass of the methyl vinyl silicone rubber compound, for example, 0.82%, 0.85%, 0.87%, 0.89%, 0.90%, 0.92%, 0.95%, 0.97% or 0.99%, etc., and the amount of the catalyst of the component B added is 1.3% to 1.5% by mass of the methyl vinyl silicone rubber compound, for example, 1.32%, 1.35%, 1.37%, 1.39%, 1.4%, 1.42%, 1.45%, 1.47% or 1.49%, etc., but the catalyst is not limited to the values listed, and other values not listed in the numerical range are equally applicable.
Preferably, the A-component catalyst comprises a 1, 3-divinyl-1, 3-tetramethyldisiloxane platinum complex and polydimethylsiloxane.
Preferably, the B-component vulcanizing agent comprises hydrogen-containing silicone oil and silicon dioxide.
Preferably, the stabilizer comprises nano cerium oxide.
The stabilizer is added into the insulating layer preparation raw material, so that the battery solution can be immersed for 48 hours at 50 ℃ and can resist battery acid for 240 hours at 125 ℃.
Preferably, the auxiliary agent comprises rare earth nanomaterial.
In the invention, the rare earth nano material comprises the following components in percentage by mass: 52-58% of methyl vinyl silicone rubber, 1-1.5% of nanoscale ferric oxide, 1-1.5% of titanium dioxide, 15-20% of white carbon black and 25-30% of cerium oxide.
The rare earth nano material is added into the insulating layer preparation raw material, and because the rare earth element has the characteristics of large atomic radius and strong complexing capacity, the rare earth element has a special complexing effect on Si, and can increase the crosslinking density and the stability among molecular chains of the silicon rubber material, so that the heat resistance, oil resistance, strength, tear resistance, wear resistance and the like of the material are greatly improved, and the rare earth nano material has the functions of promoting vulcanization, absorbing and shielding ultraviolet radiation, so that the product is more resistant to aging.
As a preferable technical scheme of the invention, the production method of the insulating material in the insulating layer comprises the following steps:
(1) Mixing methyl vinyl silicone rubber, white carbon black, a structure control agent and a release agent to obtain a mixture, and then sequentially carrying out first kneading and second kneading to obtain a molded methyl vinyl silicone rubber insulating material;
(2) Sequentially carrying out first open milling and filtering on the molded methyl vinyl silicone rubber insulating material in the step (1) to obtain methyl vinyl silicone rubber compound;
(3) And (3) sequentially adding a color paste, a B component vulcanizing agent, an A component catalyst, a stabilizer and an auxiliary agent into the methyl vinyl silicone rubber compound in the step (2) for secondary open mixing, and then standing and cooling to obtain the insulating material.
The invention prepares gas phase thermal methyl vinyl silicone rubber compound through kneading, open mixing and filtering, and prepares insulating material through open mixing, adding auxiliary agent and standing cooling for production operation.
In a preferred embodiment of the present invention, the temperature of the first kneading in the step (1) is 55 to 65℃and may be 56℃57℃58℃59℃60℃61℃62℃63℃64℃or the like, but the present invention is not limited to the above-mentioned values, and other values not shown in the above-mentioned value range are equally applicable.
The temperature of the second kneading in the step (1) is preferably 105 to 115℃and may be, for example, 106℃107℃108℃109℃110℃111℃112℃113℃114℃or the like, but is not limited to the values listed, and other values not listed in the range are equally applicable.
Preferably, the second kneading in the step (1) is performed under vacuum, and the time for evacuating is 80 to 100 minutes, and for example, 82 minutes, 85 minutes, 87 minutes, 89 minutes, 90 minutes, 92 minutes, 95 minutes, 97 minutes or 99 minutes, etc., but not limited to the recited values, and other non-recited values within the range of the values are equally applicable.
Preferably, the second kneading in the step (1) has a vacuum degree of-0.07 to-0.08 MPa, for example, -0.072MPa, -0.074MPa, -0.075MPa, -0.076MPa, -0.078MPa or-0.079 MPa, etc., but the vacuum degree is not limited to the values listed, and other values not listed in the numerical range are equally applicable.
Preferably, the temperature of the first open mill in the step (2) is 15-25 ℃ and the humidity is 55-70%.
In the present invention, the temperature of the first mill may be, for example, 16℃and 17℃and 18℃and 19℃and 20℃and 21℃and 22℃and 23℃and 24℃and the humidity of the first mill may be 55% to 70%, for example, 57%, 60%, 62%, 64%, 65%, 67% and 69%, etc., but the temperature is not limited to the values listed, and other values not listed in the numerical range are applicable.
Preferably, the time of the first open mill in the step (2) is 60-75 min, for example, 62min, 65min, 67min, 70min, 72min or 74min, but not limited to the recited values, and other non-recited values in the numerical range are equally applicable.
The invention carries out vulcanization test on the methyl vinyl silicone rubber compound in the step (2), adds the component B vulcanizing agent and the component A catalyst into the methyl vinyl silicone rubber compound, carries out tabletting for 5min at the temperature of 140 ℃, and then tests the physical properties of the mixture, and the test results are shown in table 1.
TABLE 1
Typical performance Detection standard Detecting data
Breakdown strength (MV/m) GB/T 1695-2005 23
Hardness of(Shore A) GB/T531.1-2008 65
Tensile Strength (MPa) GB/T528-2009 9.5
Elongation (%) GB/T528-2009 450
Breaking Strength (kN/m) GB/T528-2009 45
Oxygen index (%) GB/T 10707-2008 27
Volume resistivity (20 ℃ C.) GB/T 1692-2008 1.7×10 15
As can be seen from Table 1, the methyl vinyl silicone rubber compound of the invention has the characteristics of high electrical property, high strength, softness, excellent flame retardant property and the like.
Preferably, the temperature of the second open mill in the step (3) is 15-25 ℃ and the humidity is 55-70%.
In the present invention, the temperature of the second mill may be, for example, 16℃and 17℃and 18℃and 19℃and 20℃and 21℃and 22℃and 23℃and 24℃and the humidity of the second mill may be 55% to 70%, for example, 57%, 60%, 62%, 64%, 65%, 67% and 69%, etc., but the temperature is not limited to the values listed, and other values not listed in the numerical range are applicable.
According to the invention, as the two-component vulcanization system silica gel of the gas-phase component A catalyst and the two-component vulcanizing agent stands still and stands, the two-component vulcanization system silica gel is sensitive to temperature, and particularly presulfiding occurs in the open-mixed silica gel insulating material with the temperature higher than 30 ℃, the open-mixed roller of the open-mixed machine adopts a constant-temperature water chiller for temperature control and cooling, the temperature control range of the water chiller is 15-25 ℃, the humidity control range is 55-70%, and the humidity is controlled by a dehumidifier and air conditioner combination.
Preferably, the second open mill is performed for 3 to 5 minutes in the silicone rubber compound of step (3), and may be performed for 3.2 minutes, 3.5 minutes, 3.7 minutes, 4 minutes, 4.2 minutes, 4.5 minutes, or 4.7 minutes, for example, but not limited to the recited values, and other non-recited values within the range of values are equally applicable.
Preferably, the time for the second open mill after the addition of the color paste and the B-component vulcanizing agent in the step (3) is 3 to 5 minutes, for example, 3.2 minutes, 3.5 minutes, 3.7 minutes, 4 minutes, 4.2 minutes, 4.5 minutes, or 4.7 minutes, etc., but the present invention is not limited to the listed values, and other values not listed in the range of the values are equally applicable.
Preferably, after the catalyst of component a is added in step (3), the second roll mill is carried out to fifteen to twenty rolls, for example, sixteen rolls, seventeen rolls, eighteen rolls, nineteen rolls, etc., but the method is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
Preferably, after the stabilizer is added in the step (3), the second open mill is performed to ten to fifteen rolls, for example, eleven rolls, twelve rolls, thirteen rolls, fourteen rolls, etc., but the present invention is not limited to the listed values, and other non-listed values within the range of the values are equally applicable.
Preferably, after the addition of the auxiliary agent in step (3), the second open mill is performed to ten to fifteen rolls, for example, eleven rolls, twelve rolls, thirteen rolls, fourteen rolls, etc., but the present invention is not limited to the listed values, and other non-listed values within the range of values are equally applicable.
In the invention, the step (3) can be used after standing and cooling to room temperature.
In the invention, the thickness of the insulating layer is 0.45-2.40mm; the thickness of the braiding layer is 0.3-0.6mm.
In the invention, the thickness of the insulating layer is controlled within the range, so that the production of different wall thickness sizes can be satisfied, and multiple selection schemes are provided for market clients; the thickness of the braiding layer is controlled within the range, so that the mechanical damage performance of reactance external force and the wear resistance of the cable can be improved.
In a second aspect, the present invention provides a method for preparing the energy storage cable according to the first aspect, the preparation method comprising:
and annealing the aluminum conductor, forming an insulating layer on the surface of the aluminum conductor through a reagent pack, and forming a braiding layer on the surface of the insulating layer through braiding.
In a preferred embodiment of the present invention, the annealing treatment is performed at a temperature of 320 to 350 ℃, for example, 325 ℃, 330 ℃, 335 ℃, 340 ℃, 345 ℃ or the like, but the annealing treatment is not limited to the values listed, and other values not listed in the numerical range are equally applicable.
Preferably, the annealing treatment is performed for 8-11h, for example, 8.5h, 9h, 9.5h, 10h, or 10.5h, etc., but the annealing treatment is not limited to the recited values, and other non-recited values in the range of values are equally applicable.
As a preferred technical solution of the present invention, the method of the pack includes: and (3) wrapping the insulating material on the surface of the aluminum conductor by using an extrusion continuous vulcanization mode through an extruder to form an insulating layer, and then cooling.
Preferably, a die core and a die sleeve are arranged on the machine head of the rubber extruder.
Preferably, the material of the mold core is 38CrMoAlA.
The depth of the nitrided layer of the mold core is preferably 0.4 to 0.6mm, and may be, for example, 0.42mm, 0.45mm, 0.47mm, 0.49mm, 0.5mm, 0.52mm, 0.55mm, 0.57mm, or 0.59mm, etc., but not limited to the values recited, and other values not recited in the numerical range are equally applicable.
According to the invention, after tempering and nitriding treatment, the nitriding layer depth of the mold core is 0.4-0.6 mm, and the mold core has higher wear resistance and corrosion resistance; and the aperture of the mold core > the diameter of the aluminum conductor, the mold core aperture = aluminum conductor diameter +0.3mm.
Preferably, the material of the die sleeve is 38CrMoAlA.
The die sleeve preferably has a nitride layer depth of 0.4 to 0.6mm, for example, 0.42mm, 0.45mm, 0.47mm, 0.49mm, 0.5mm, 0.52mm, 0.55mm, 0.57mm, or 0.59mm, etc., but not limited to the values recited, and other values not recited in the numerical range are equally applicable.
According to the invention, after tempering and nitriding treatment, the depth of the nitriding layer of the die sleeve is 0.4-0.6 mm, the surface hardness is more than 850HV, the brittleness is less than or equal to grade II, and the die sleeve has higher wear resistance and corrosion resistance; and the die sleeve aperture = aluminum conductor diameter +2 x insulation nominal thickness +0.2mm.
In the invention, the die sleeve is a split die sleeve, and the rear die sleeve and the rear machine body are processed together, so that the clearance between the side pressing roller and the machine body is ensured to be less than 0.15mm.
The die sleeve is provided with a flowing cone angle with the radius phi of 1.5mm, so that the problems of flowability of a silica gel material and die sticking of an inner layer of sizing material are solved.
Preferably, the machine body of the rubber extruder is cooled by a water chiller, the rubber extruder is vulcanized and molded by a high-temperature oven from feeding to discharging, and the continuous vulcanization temperature zone comprises: the first zone, the second zone, the third zone, the fourth zone and the fifth zone are vulcanization shaping zones, and the sixth zone, the seventh zone and the eighth zone are constant temperature vulcanization heat preservation sections.
Preferably, the temperature of the first zone is 380-400 ℃, the temperature of the second zone is 360-380 ℃, the temperature of the third zone is 330-350 ℃, the temperature of the fourth zone is 300-320 ℃, the temperature of the fifth zone is 280-290 ℃, the temperature of the sixth zone is 150-180 ℃, the temperature of the seventh zone is 150-180 ℃, and the temperature of the eighth zone is 150-180 ℃.
In the present invention, the temperature of the first region may be 380 to 400 ℃, such as 382 ℃, 385 ℃, 387 ℃, 390 ℃, 392 ℃, 395 ℃, 397 ℃, 399 ℃, etc., the temperature of the second region may be 360 to 380 ℃, such as 362 ℃, 365 ℃, 367 ℃, 370 ℃, 372 ℃, 375 ℃, 377 ℃, 379 ℃, etc., the temperature of the third region may be 330 to 350 ℃, such as 332 ℃, 335 ℃, 337 ℃, 340 ℃, 342 ℃, 345 ℃, 347 ℃, 349 ℃, etc., the temperature of the fourth region may be 300 to 320 ℃, such as 302 ℃, 305 ℃, 307 ℃, 310 ℃, 312 ℃, 315 ℃, 317 ℃, 319 ℃, etc., the temperature of the fifth region may be 280 to 290 ℃, for example, the temperature of the six zones may be 282 ℃, 285 ℃, 287 ℃, 290 ℃, 292 ℃, 295 ℃, 297 ℃, 299 ℃, 150 to 180 ℃, for example 152 ℃, 155 ℃, 160 ℃, 162 ℃, 165 ℃, 170 ℃, 175 ℃, or the like, the temperature of the seven zones may be 150 to 180 ℃, for example 152 ℃, 155 ℃, 157 ℃, 160 ℃, 162 ℃, 165 ℃, 170 ℃, 175 ℃, or the like, and the temperature of the eight zones may be 150 to 180 ℃, for example 152 ℃, 155 ℃, 157 ℃, 160 ℃, 162 ℃, 165 ℃, 170 ℃, or 175 ℃, or the like, but not limited to the values recited, and other values not recited in the numerical ranges are equally applicable.
The outer diameter deviation of the insulating layer is preferably-0.1 to 0.1mm, and may be, for example, -0.07mm, -0.05mm, -0.02mm, 0mm, 0.02mm, 0.05mm, 0.07mm, or 0.09mm, etc., but is not limited to the values recited, and other values not recited in the numerical range are equally applicable.
Preferably, the concentricity of the insulating layer is more than 95%, for example, 95.5%, 96%, 96.5%, 97%, 97.5%, 98% or 99%, etc., but not limited to the recited values, and other non-recited values within the range of values are equally applicable.
In the invention, a mold core and a mold sleeve combination with specific materials and structural design are adopted, the outer diameter deviation of the insulating layer after extrusion is-0.1 mm, and the concentricity is more than 95%.
As a preferred technical solution of the present invention, the method for knitting includes: and weaving Kevlar fiber yarns on the surface of the insulating layer to form a weaving layer.
The braiding machine adopted by the invention is a 16-spindle braiding machine, and the number of each spindle is 1. The Kevlar fiber yarn has the advantages of low material density, high strength, good toughness, high temperature resistance, acid and alkali resistance, corrosion resistance of organic solvents and the like, can improve the cable protection performance, improves the mechanical damage resistance of the cable, and enables the cable to be more scratch-resistant.
Preferably, the pitch of the knitting is 15 to 45mm, for example, 20mm, 25mm, 30mm, 35mm, 37mm, etc., but not limited to the recited values, and other non-recited values within the range of values are equally applicable.
The invention adjusts the tension of the knitting yarn in the knitting process, and ensures that the tension of the knitting yarn in the production process is uniform and consistent. The braided filaments should be uniform, flat and tight, and should not have the phenomenon of scar leakage.
The numerical ranges recited herein include not only the recited point values, but also any point values between the recited numerical ranges that are not recited, and are limited to, and for the sake of brevity, the invention is not intended to be exhaustive of the specific point values that the recited range includes.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the energy storage cable provided by the invention, a light aluminum conductor is adopted to replace a copper conductor, the weight of the cable in unit length is reduced by more than 40%, the purchase cost can be reduced by more than 20%, and the flexibility is improved;
(2) According to the energy storage cable, the formula of the insulating layer material with high flexibility, long service life and high electrical property is designed, the dependence on the Arrhenius regression curve is deduced, the temperature index is required to be actually measured at 135 ℃ for 20000 hours, and the upper limit of the original irradiation polyolefin material is solved; elongation at break retention after hot life is not less than 50%; the outer diameter deviation of the insulating layer is minus 0.1-0.1 mm and the concentricity is more than 95% through a specific production method and a mold design;
(3) According to the energy storage cable provided by the invention, the light aluminum conductor is adopted to replace a copper conductor, the insulating layer material formula with high flexibility, long service life and high electrical property and the braided layer are adopted as the cable reinforced composite structure layer, so that the energy storage cable has excellent ageing resistance, flame retardance, battery acid resistance, low temperature resistance, high flexibility and high electrical property and excellent comprehensive performance, and can meet the use requirements of the energy storage cable;
(4) The preparation method of the energy storage cable is simple and convenient, the prepared cable meets the design requirement, and meanwhile, the qualification rate reaches more than 98%.
Drawings
FIG. 1 is a 35mm of the present invention 2 Temperature rise curve graphs of the Cu connecting cable at different environmental temperatures;
FIG. 2 is a 50mm of the present invention 2 Temperature rise curve graphs of the Al connecting cable at different environmental temperatures;
fig. 3 is a schematic structural diagram of an energy storage cable according to the present invention;
wherein, 1-aluminum conductor, 2-insulating layer, 3-braid.
Detailed Description
The technical scheme of the invention is further described by the following specific embodiments. It will be apparent to those skilled in the art that the examples are merely to aid in understanding the invention and are not to be construed as a specific limitation thereof.
The applicant tests the conversion proportion relation of the aluminum and copper sections of the copper-aluminum cable under the same current-carrying temperature rise at different environmental temperatures, and provides technical data for light electrical design.
The invention actually measures 35mm for energy storage 2 Cu and 50mm 2 Temperature rise curves (shown in figures 1-2) of the Al silicon rubber insulated light flexible long-service life connecting cable under different environmental temperatures. Carrying out current-carrying and temperature-rising comparison on the copper core and the aluminum core under different environment test temperatures to obtain the following conclusion: if the equivalent current-carrying temperature rise is achieved under different environmental temperatures, the conversion relation between the copper core section and the aluminum core section is as follows: copper core cross section is approximately equal to 1.43 times aluminum core cross section.
The applicant screens the partial preparation raw materials of the insulating layer, the insulating layer adopts gas phase heat vulcanized silicone rubber compound as raw materials, adopts a platinum double-component vulcanization system, and the acid resistance, alkali resistance and oil resistance of the silicone rubber are influenced by factors of the type of raw rubber, the type and the addition amount of the filler, the type of silicone oil and the crosslinking density. Strong acid and strong alkali have depolymerization and decomposition phenomena on the silicon rubber. The applicant has improved the following aspects, such as raw material screening, formula optimization, etc.
1. Screening methyl vinyl silicone rubber (green):
raw rubber with high volatile matters contains more micromolecular substances, is easily attacked by acidic substances, and causes cracking of the rubber material. The test shows that the volatile components of different brands of raw rubber are quite different. The test results are shown in Table 2, and the following examples and comparative examples use SQJ-4 raw rubber.
TABLE 2
2. Screening hydroxyl silicone oil:
silicone oils with high volatile content contain a large number of small molecular substances, which, although facilitating the mixing, tend to cause self-cracking of the gum during heat aging. Air bubbles are also generated when the wire is drawn. The volatility of the silicone oil of different brands is also quite different through test comparison. Through inspection test, BY-4 silicone oil has low volatile matter, and the test results are shown in Table 3, and BY-4 silicone oil is adopted in subsequent examples and comparative examples.
TABLE 3 Table 3
3. Screening white carbon black:
the smaller the particle size of the white carbon black, the larger the surface area, the better the reinforcing effect, and the white carbon black with the same particle size has great differences in chemical and physical properties, trace impurities contained, oil absorption value and the like of the surface due to different preparation methods of synthetic routes.
TABLE 4 Table 4
Scheme one Scheme II Scheme III Scheme IV Scheme five Scheme six
Gas phase powder HF HF CQ CQ H H
Lot number 221025 221027 221027A 221105 221107 221108
Hardness of 64 67 66 57 61 62
Tensile Strength 9 9.5 9.2 8.3 9.3 9.5
Elongation percentage 485 523 540 645 603 594
Tear strength 32 32 34 40 39 40
Plasticity degree 262 267 276 223 245 240
Baking air bubbles Has the following components Without any means for Without any means for Has the following components Without any means for Without any means for
Fourth, the method comprises the following steps: adding a two-component vulcanizing agent
The silica gel has low compression set, high mechanical property and low content of boiling point substances in the system, and is helpful for improving acid resistance. Therefore, the vulcanized rubber is required to achieve sufficient crosslinking to achieve the optimum performance values. By adopting the two-component vulcanizing agent to match with the vulcanization temperature, the best vulcanization effect is achieved. From the data detection, as shown in table 5, the data change after heat aging was small and the retention rate was high.
TABLE 5
In the present invention, some of the raw materials in the following examples and comparative examples are as follows:
the methyl vinyl silicone rubber is SQJ-4 raw rubber (C.A. S. No. 68083-18-1);
the white carbon black is the six-gas-phase white carbon black (C.A. S. No. 7631-86-9) in the scheme shown in Table 4;
the structure control agent is BY-4 silicone oil (C.A.S. No. 70131-67-8);
the release agent is zinc stearate (C.A.S. No. 557-05-01);
the vulcanizing agent comprises an A-component catalyst and a B-component vulcanizing agent; the A component catalyst is an XH-E305A catalyst, and the B component vulcanizing agent is an XH-E305H delayed crosslinking agent;
the stabilizer is nano cerium oxide (C.A. S. No. 84852-53-9);
the auxiliary agent is a rare earth nanomaterial, and the rare earth nanomaterial comprises the following components in percentage by mass: 55% of methyl vinyl silicone rubber, 1% of nanoscale ferric oxide, 1% of titanium dioxide, 18% of white carbon black and 25% of cerium oxide.
Examples 1 to 3
Embodiments 1-3 provide an energy storage cable, the structure of which is shown in fig. 3, wherein the energy storage cable sequentially comprises an aluminum conductor 1, an insulating layer 2 (with the thickness of 0.45-2.40 mm) and a braiding layer 3 (with the thickness of 0.3-0.6 mm) from inside to outside;
the preparation method of the aluminum conductor 1 comprises the following steps: smelting an aluminum ingot at 830 ℃ in sequence, casting, drawing and wiredrawing at 730 ℃ to obtain aluminum monofilaments with the diameter of 0.46mm, the elongation of 18%, the conductivity of 65% IACS and the tensile strength of 100MPa, bundling a plurality of aluminum monofilaments into aluminum strands, twisting the aluminum strands into an aluminum conductor, wherein the twisting directions of adjacent layers of aluminum strands are opposite, the outermost layer is left, and the twisting pitch of the outermost layer of aluminum strands is 12 times of the outer diameter of the aluminum conductor after twisting;
The composition of the preparation raw materials of the insulating layer 2 is shown in tables 6 and 7;
the mass contents of the methyl vinyl silicone rubber, white carbon black, structure controlling agent and release agent are shown in table 6.
TABLE 6
Material name Example 1 Example 2 Example 3
Methyl vinyl silicone rubber 65％ 60％ 67.8％
White carbon black 32％ 35％ 30％
Structure control agent 2.5％ 4％ 2％
Release agent 0.5％ 1％ 0.2％
The methyl vinyl silicone rubber, the white carbon black, the structure control agent and the release agent form methyl vinyl silicone rubber compound; the amounts of the color paste, the A-component catalyst, the B-component vulcanizing agent, the stabilizer and the auxiliary agent added based on the 20kg of the methyl vinyl silicone rubber compound are shown in Table 7.
TABLE 7
Material name Example 1 Example 2 Example 3
Color gel 0.7％ 0.6％ 0.8％
A-component catalyst 0.9％ 0.8％ 1.0％
B component vulcanizing agent 1.4％ 1.3％ 1.5％
Stabilizing agent 1.2％ 0.8％ 1.5％
Auxiliary agent 2.2％ 2％ 2.5％
The production method of the insulating material in the insulating layer 2 comprises the following steps:
(1) Mixing methyl vinyl silicone rubber, white carbon black, a structure control agent and a release agent to obtain a mixture, performing first kneading and agglomerating at the temperature of 60 ℃, vacuumizing for 90min, heating to 105-115 ℃ and performing second kneading and mixing at the vacuum degree of-0.075 MPa to obtain a molded methyl vinyl silicone rubber insulating material;
(2) Carrying out first open milling on the molded methyl vinyl silicone rubber insulating material in the step (1) at the temperature of 20 ℃ and the humidity of 62% for 70min, and then sequentially filtering through a 50-mesh filter screen and a 300-mesh filter screen to obtain methyl vinyl silicone rubber compound;
(3) Performing second open milling on the 20kg methyl vinyl silicone rubber compound obtained in the step (2) at the temperature of 20 ℃ and the humidity of 62% for 4min, adding the colored rubber and the B component vulcanizing agent, continuing the second open milling for 4min, adding the A component catalyst, performing second open milling to eighteen rollers, adding the stabilizer, performing second open milling to twelve rollers, adding the auxiliary agent, performing second open milling to twelve rollers, and standing and cooling to room temperature to obtain the insulating material;
in examples 1-3, the energy storage cable was prepared by a preparation method comprising: annealing the aluminum conductor 1 at 340 ℃ for 8 hours, forming an insulating layer 2 on the surface of the aluminum conductor 1 through a kit, and then braiding Kevlar fiber yarns on the surface of the insulating layer 2 through a 16-spindle braiding machine to form a braiding layer 3 on the surface of the insulating layer 2, wherein the braiding pitch is 30mm;
the method for the agent package adopted by the insulating layer 2 comprises the following steps: wrapping the insulating material on the surface of the aluminum conductor by using an extrusion continuous vulcanization mode through an extruder to form an insulating layer 2, and then cooling;
a die core and a die sleeve are arranged on the machine head of the rubber extruder;
the die core is made of 38CrMoAlA, the depth of the nitriding layer is 0.5mm, and the aperture of the die core is equal to the diameter of the aluminum conductor plus 0.3mm; the die sleeve is made of 38CrMoAlA, the depth of the nitriding layer is 0.5mm, the aperture of the die sleeve=the diameter of the aluminum conductor +2×the nominal insulation thickness +0.2mm, and the die matching distance is more than or equal to 7mm; the die sleeve is a split die sleeve, and the rear die sleeve and the rear machine body are processed together;
The machine body of the rubber extruder is cooled by a water chiller, the rubber extruder is vulcanized and molded from a feeding direction to a discharging direction by a high-temperature oven, and a continuous vulcanization temperature zone is as follows: the first zone, the second zone, the third zone, the fourth zone and the fifth zone are vulcanization shaping zones, the sixth zone, the seventh zone and the eighth zone are constant temperature vulcanization heat preservation sections, wherein the temperature of the first zone is 390 ℃, the temperature of the second zone is 370 ℃, the temperature of the third zone is 340 ℃, the temperature of the fourth zone is 310 ℃, the temperature of the fifth zone is 285 ℃, the temperature of the sixth zone is 170 ℃, the temperature of the seventh zone is 170 ℃, and the temperature of the eighth zone is 170 ℃;
the fluctuation of the outer diameter of the insulating layer after extrusion is +/-0.1 mm, and the concentricity is more than 95%.
Example 4
This embodiment differs from embodiment 1 only in that: the mass content of the white carbon black was 25%, and correspondingly the mass content of the methyl vinyl silicone rubber was adjusted to 72%, except that the same conditions as in example 1 were adopted.
Example 5
This embodiment differs from embodiment 1 only in that: the mass content of the white carbon black was 40%, and accordingly the mass content of the methyl vinyl silicone rubber was adjusted to 57%, and the other conditions were the same as in example 1.
Example 6
This embodiment differs from embodiment 1 only in that: the addition amount of the A-component catalyst was 0.5%, and the other conditions were the same as in example 1.
In the embodiment, the addition amount of the catalyst of the component A is too low, so that when rubber is extruded by online extrusion flow processing, the temperature point of vulcanization of silica gel is not reached, and the prepared energy storage cable is flattened, deformed and not molded.
Example 7
This embodiment differs from embodiment 1 only in that: the addition amount of the A-component catalyst was 1.5%, and the other conditions were the same as in example 1.
In the embodiment, the addition amount of the A component catalyst is too high, so that the catalytic material accelerates vulcanization, and the prepared energy storage cable has the problems of bulge, rupture and the like.
Example 8
This embodiment differs from embodiment 1 only in that: the amount of the B-component vulcanizing agent added was 1%, and the other conditions were the same as in example 1.
In the embodiment, the insulating adhesive aluminum conductor of the energy storage cable prepared by the too low crosslinking degree can not be stripped due to the too low addition amount of the vulcanizing agent of the component B.
Example 9
This embodiment differs from embodiment 1 only in that: the amount of the B-component vulcanizing agent added was 2%, and the other conditions were the same as in example 1.
In the embodiment, the B component vulcanizing agent is excessively high in addition amount, and the crosslinking degree is excessively high, so that the prepared energy storage cable is poor in product due to needle hole holes on the inner surface of the insulation.
Example 10
This embodiment differs from embodiment 1 only in that: except that the aluminum conductor was not annealed, the conditions were the same as in example 1.
Comparative example 1
This comparative example differs from example 1 only in that: the conditions were the same as in example 1 except that the stabilizer was not added.
Performance testing
The energy storage cables prepared in the above examples and comparative examples were subjected to the following test:
(1) Aging resistance: according to GB/T11026.1 and GB/T11026.2, ageing resistance is tested, the temperature index is not lower than 135 ℃ when the temperature index passes through an Arrhenius regression curve 20000 hours, the elongation at break is tested, and the test result is based on the elongation at break not lower than 50%;
(2) Flame retardancy: the single, VW-1 and bundled C type combustion tests are respectively carried out according to the methods specified by GB/T18380.12, UL1581 and GB/T18380.35, and the test results reach and pass the standards specified by GB/T18380.12, UL1581 and GB/T18380.35;
(3) Battery acid resistance: immersing 2/3 of a sample in a solvent (25% sulfuric acid and 75% water) according to a CQC1143 annex A regulation method, taking out the sample, airing for 3min, carrying out an aging test at 125 ℃ for 240h, carrying out a winding test, immersing the sample in a 3% NaCl solution water solution, applying 2.5kV alternating current withstand voltage for 5min, and taking the test result as the standard that the test surface has no cracks and the cable has no breakdown;
(4) Low temperature resistance: subjecting the test sample to-50 ℃ low-temperature impact and-50 ℃ low-temperature winding of the cable without cracks, and testing the tensile rate of the test sample by a-50 ℃ low-temperature tensile test, wherein the test result is based on the tensile rate of not less than 50%;
(5) Softness: performing a soft performance test according to the TICW27, and testing the minimum bending radius of the cable, wherein the test result is up to 6 times of the outer diameter of the cable as a standard;
(6) Resistivity: resistivity test according to GB/T1692, and the result of the test is that the body electricity is not lower than 10 15 Omega cm is standard;
the test results are shown in Table 8.
TABLE 8
As can be seen from table 8:
(1) By adopting the preparation raw material composition and the preparation method of the energy storage cable provided by the embodiment 1-3, the weight of the cable in unit length is reduced by 20% -40%, the purchase cost is reduced by more than 20% -25%, and the prepared cable has excellent ageing resistance, flame retardance, battery acidity resistance, low temperature resistance, high flexibility and high electrical property, and excellent comprehensive performance, and can meet the use requirement of the energy storage cable;
(2) As can be seen from comparison of the comprehensive examples 1 and examples 4-5, when the addition amount of the white carbon black is too low, the LOI value of the pure silicone rubber is very low and is only 19.4%, and the LOI value cannot be improved, so that the silicone rubber is very easy to ignite, the prepared energy storage cable cannot pass through the detection of vertical VW-1 combustion, GB/T18380 bundling flame retardance and the like, and the product performance requirement is not met; when the addition amount of the white carbon black is too high, agglomeration phenomenon is easy to occur among the white carbon black, so that the mechanical property of the material and the flexibility of the product are affected, the long-term durable aging of the prepared energy storage cable is poor, and the softness of the cable cannot meet the wiring laying requirement;
(3) As can be seen from the comparison between the example 1 and the example 10, when the aluminum conductor is not annealed, the bending performance of the prepared energy storage cable is poor, the wiring laying dynamic construction is repeatedly bent due to the high monofilament hardness and low elongation, and the cable conductor has fracture risk.
The applicant states that the detailed structural features of the present invention are described by the above embodiments, but the present invention is not limited to the above detailed structural features, i.e. it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be apparent to those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope of the present invention and the scope of the disclosure.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.

Claims (10)

1. The energy storage cable is characterized by sequentially comprising an aluminum conductor, an insulating layer and a braiding layer from inside to outside;
the preparation raw materials of the insulating layer comprise the following components: methyl vinyl silicone rubber, white carbon black, a structure control agent, a release agent, a color paste, a vulcanizing agent, a stabilizer and an auxiliary agent.
2. The energy storage cable of claim 1, wherein the method of preparing the aluminum conductor comprises: sequentially smelting, casting, drawing and wiredrawing an aluminum ingot to obtain aluminum monofilaments, bundling a plurality of aluminum monofilaments into an aluminum strand, and twisting to prepare an aluminum conductor;
preferably, the smelting temperature is 800-850 ℃;
preferably, the casting temperature is 700-750 ℃;
preferably, the diameter of the aluminum monofilament is 0.41-0.52 mm;
preferably, the elongation of the aluminum monofilaments is more than or equal to 14%, preferably more than or equal to 18%;
preferably, the conductivity of the aluminum monofilaments is more than or equal to 62% IACS;
preferably, the tensile strength of the aluminum monofilaments is 75-120 MPa;
preferably, the binding direction is right;
preferably, the direction of the twisting of adjacent layers of aluminum strands is opposite;
preferably, the twisting pitch of the outermost aluminum strands is no more than 14 times the outer diameter of the aluminum conductor after twisting.
3. The energy storage cable of claim 1 or 2, wherein the methyl vinyl silicone rubber, white carbon, structure control agent and release agent comprise a methyl vinyl silicone rubber compound;
preferably, the mass content of the methyl vinyl silicone rubber in the methyl vinyl silicone rubber compound is 60-70%, the mass content of the white carbon black is 30-35%, the mass content of the structure control agent is 5-10%, and the mass content of the release agent is 0.1-1% based on the mass of the methyl vinyl silicone rubber compound;
preferably, the addition amount of the color rubber is 0.6-0.8% of the mass of the methyl vinyl silicone rubber compound;
preferably, the addition amount of the vulcanizing agent is 2.1-2.5% of the mass of the methyl vinyl silicone rubber compound;
preferably, the addition amount of the stabilizer is 0.8-1.5% of the mass of the methyl vinyl silicone rubber compound;
preferably, the addition amount of the auxiliary agent is 2-2.5% of the mass of the methyl vinyl silicone rubber compound.
4. The energy storage cable of any one of claims 1-3, wherein the methyl vinyl silicone rubber comprises a dimethylmethyl vinyl;
Preferably, the structure controlling agent comprises a hydroxy silicone oil;
preferably, the release agent comprises zinc stearate;
preferably, the vulcanizing agent comprises an A-component catalyst and a B-component vulcanizing agent;
preferably, the addition amount of the A component catalyst is 0.8-1.0% of the mass of the methyl vinyl silicone rubber compound, and the addition amount of the B component vulcanizing agent is 1.3-1.5% of the mass of the methyl vinyl silicone rubber compound;
preferably, the a-component catalyst comprises a 1, 3-divinyl-1, 3-tetramethyldisiloxane platinum complex and polydimethylsiloxane;
preferably, the B-component vulcanizing agent comprises hydrogen-containing silicone oil and silicon dioxide;
preferably, the stabilizer comprises nano cerium oxide;
preferably, the auxiliary agent comprises rare earth nanomaterial.
5. The energy storage cable of any one of claims 1-4, wherein the method of producing the insulation in the insulation layer comprises:
(1) Mixing methyl vinyl silicone rubber, white carbon black, a structure control agent and a release agent to obtain a mixture, and then sequentially carrying out first kneading and second kneading to obtain a molded methyl vinyl silicone rubber insulating material;
(2) Sequentially carrying out first open milling and filtering on the molded methyl vinyl silicone rubber insulating material in the step (1) to obtain methyl vinyl silicone rubber compound;
(3) And (3) sequentially adding a color paste, a B component vulcanizing agent, an A component catalyst, a stabilizer and an auxiliary agent into the methyl vinyl silicone rubber compound in the step (2) for secondary open mixing, and then standing and cooling to obtain the insulating material.
6. The energy storage cable of claim 5, wherein the temperature of the first kneading of step (1) is 55-65 ℃;
preferably, the temperature of the second kneading of step (1) is 105 to 115 ℃;
preferably, the second kneading in the step (1) is performed under vacuum, and the time for evacuating is 80-100 min;
preferably, the second kneading of step (1) has a vacuum degree of-0.07 to-0.08 MPa;
preferably, the temperature of the first open mill in the step (2) is 15-25 ℃ and the humidity is 55-70%;
preferably, the time of the first open mill in the step (2) is 60-75 min;
preferably, the temperature of the second open mill in the step (3) is 15-25 ℃ and the humidity is 55-70%;
preferably, the time for carrying out the second open mill on the silicone rubber compound in the step (3) is 6-10 min;
preferably, after the color paste and the B-component vulcanizing agent are added in the step (3), the second open-milling is carried out for 3-5 min;
preferably, after the component A catalyst is added in the step (3), carrying out second open refining to fifteen to twenty rolls;
Preferably, after the stabilizer is added in the step (3), carrying out second open mill to ten-fifteen rolls;
preferably, after the auxiliary agent is added in the step (3), the second open mill is performed to ten to fifteen rolls.
7. A method of manufacturing an energy storage cable according to any one of claims 1-6, wherein the method of manufacturing comprises:
and annealing the aluminum conductor, forming an insulating layer on the surface of the aluminum conductor through a reagent pack, and forming a braiding layer on the surface of the insulating layer through braiding.
8. The method of claim 7, wherein the annealing is performed at a temperature of 320-350 ℃;
preferably, the annealing treatment is carried out for 8-11 hours.
9. The method of preparing a kit according to claim 7 or 8, wherein the method of preparing a kit comprises: wrapping the insulating material on the surface of the aluminum conductor by using an extrusion continuous vulcanization mode through an extruder to form an insulating layer, and then cooling;
preferably, a die core and a die sleeve are arranged on the machine head of the rubber extruder;
preferably, the material of the mold core is 38CrMoAlA;
preferably, the depth of the nitriding layer of the mold core is 0.4-0.6 mm;
preferably, the die sleeve is made of 38CrMoAlA;
Preferably, the depth of the nitriding layer of the die sleeve is 0.4-0.6 mm;
preferably, the machine body of the rubber extruder is cooled by a water chiller, the rubber extruder is vulcanized and molded by a high-temperature oven from feeding to discharging, and the continuous vulcanization temperature zone comprises: the first area, the second area, the third area, the fourth area and the fifth area are vulcanization shaping areas, and the sixth area, the seventh area and the eighth area are constant temperature vulcanization heat preservation sections;
preferably, the temperature of the first zone is 380-400 ℃, the temperature of the second zone is 360-380 ℃, the temperature of the third zone is 330-350 ℃, the temperature of the fourth zone is 300-320 ℃, the temperature of the fifth zone is 280-290 ℃, the temperature of the sixth zone is 150-180 ℃, the temperature of the seventh zone is 150-180 ℃, and the temperature of the eighth zone is 150-180 ℃;
preferably, the outer diameter deviation of the insulating layer is-0.1 mm;
preferably, the concentricity of the insulating layer is more than 95%.
10. The method of any one of claims 7-9, wherein the method of braiding comprises: weaving Kevlar fiber yarns on the surface of the insulating layer to form a weaving layer;
preferably, the pitch of the braiding is 15-45 mm.
CN202311526776.2A 2023-11-16 2023-11-16 Energy storage cable and preparation method thereof Pending CN117612764A (en)

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Application Number Priority Date Filing Date Title
CN202311526776.2A CN117612764A (en) 2023-11-16 2023-11-16 Energy storage cable and preparation method thereof

Publications (1)

Publication Number Publication Date
CN117612764A true CN117612764A (en) 2024-02-27

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Application Number Title Priority Date Filing Date
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Country Link
CN (1) CN117612764A (en)

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