CN114420347A - Cable for new energy automobile, preparation method and application - Google Patents
Cable for new energy automobile, preparation method and application Download PDFInfo
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- CN114420347A CN114420347A CN202210171700.1A CN202210171700A CN114420347A CN 114420347 A CN114420347 A CN 114420347A CN 202210171700 A CN202210171700 A CN 202210171700A CN 114420347 A CN114420347 A CN 114420347A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 239000004020 conductor Substances 0.000 claims abstract description 102
- 238000007745 plasma electrolytic oxidation reaction Methods 0.000 claims abstract description 54
- 238000010438 heat treatment Methods 0.000 claims description 104
- 230000006698 induction Effects 0.000 claims description 102
- 229910052782 aluminium Inorganic materials 0.000 claims description 88
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 88
- 229910052751 metal Inorganic materials 0.000 claims description 79
- 239000002184 metal Substances 0.000 claims description 79
- 239000002131 composite material Substances 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 44
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 32
- 230000035939 shock Effects 0.000 claims description 31
- 239000011224 oxide ceramic Substances 0.000 claims description 28
- 229910052574 oxide ceramic Inorganic materials 0.000 claims description 28
- 229920002379 silicone rubber Polymers 0.000 claims description 28
- 229910052802 copper Inorganic materials 0.000 claims description 21
- 239000010949 copper Substances 0.000 claims description 21
- 239000012528 membrane Substances 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 14
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 13
- 238000004073 vulcanization Methods 0.000 claims description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 10
- 239000004945 silicone rubber Substances 0.000 claims description 7
- 238000009941 weaving Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 15
- 230000000052 comparative effect Effects 0.000 description 21
- 238000009413 insulation Methods 0.000 description 13
- 230000002500 effect on skin Effects 0.000 description 6
- 238000005491 wire drawing Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 2
- 239000004433 Thermoplastic polyurethane Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
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Classifications
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
-
- 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
-
- 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
-
- 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
- H01B7/30—Insulated conductors or cables characterised by their form with arrangements for reducing conductor losses when carrying alternating current, e.g. due to skin effect
- H01B7/303—Conductors comprising interwire insulation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Insulated Conductors (AREA)
Abstract
The invention provides a cable for a new energy automobile, a preparation method and application thereof. According to the invention, the micro-arc oxidation treatment is carried out on the surface of the conductor, so that the current-carrying capacity is improved, the insulating property is excellent, and a good shielding effect can be achieved by arranging the shielding layer.
Description
Technical Field
The invention belongs to the technical field of new energy automobiles, relates to a cable, and particularly relates to a cable for a new energy automobile, a preparation method and application.
Background
In recent years, new energy automobiles are developed at a high speed on a large scale by virtue of the properties of energy conservation and environmental protection, and cables serving as important matched products of the new energy automobiles are also developed rapidly, have continuous and complete performances, have certain flexibility and tear resistance, and are required to have high and low temperature resistance, waterproof performance, high current resistance and shielding performance.
CN104835565A discloses a cable for a new energy automobile charging device, which comprises a conductor, a cable core and an outer sheath, wherein the cable core is formed by stranding a plurality of strands of insulated wire cores, and filling ropes are arranged in gaps of the cable core; the cable comprises a cable core, a filling rope, a copper wire braided shielding layer, a thermoplastic polyurethane elastomer rubber sheath layer and a copper wire braided shielding layer, wherein the cable core and the filling rope are wound and coated with the sheath layer; the insulated wire core is composed of a copper core soft conductor and a thermoplastic vulcanized rubber insulating layer extruded outside the copper core soft conductor.
CN113035438A discloses a new energy automobile charges with high-power charging cable for the connection fills electric pile and rifle that charges, includes: an outer sheath; the liquid cooling wire cores are arranged in the outer sheath and comprise at least two liquid cooling wire cores; the auxiliary wire core is arranged in the outer sheath, and two ends of the auxiliary wire core are respectively connected with the charging pile and the charging gun; the temperature measuring device is arranged in the outer sheath; switching device, liquid cooling sinle silk one end is connected with the rifle that charges, and the other end passes through switching device and is connected with filling electric pile, the liquid cooling sinle silk with supplementary sinle silk is parallelly connected, switching device includes: the switching disc is rotatably arranged on the wire connecting ring and provided with a second electrode, the second electrode is used for being connected with the first electrode, and the second electrode is connected to a charging pile; and the motor drives the switching disc to rotate.
CN112331400A discloses high tension cable in car for new energy automobile, including the high tension cable body, state that high tension cable originally includes tin-plated copper strand wires conductor, the cover is equipped with the silicon rubber insulating layer on the surface of tin-plated copper strand wires conductor, the cover is equipped with the sheath on the surface of silicon rubber insulating layer, be provided with the tinned wire shielding between silicon rubber insulating layer and the sheath.
At present, in order to increase the power and current carrying of the cable, the conductor sectional area of the cable is generally increased, but the flexibility of the cable is weakened due to the increase of the conductor sectional area of the cable, and the flexibility is also correspondingly deteriorated. Therefore, how to maintain the effective conductor cross section and increase the power and current carrying of the cable has important significance.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a cable for a new energy automobile, a preparation method and application.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a cable for a new energy automobile, which comprises a conductor, wherein an insulating layer and a shielding layer are sequentially laminated on the outer surface of the conductor, the conductor comprises at least two composite layers which are sequentially laminated from inside to outside along a radial direction, the composite layers are formed by twisting at least one metal strand, and the outer surface of the metal strand is subjected to micro-arc oxidation to form an oxide ceramic membrane.
According to the cable for the new energy automobile, the surface of the conductor is subjected to micro-arc oxidation to form the ceramic oxide layer, so that the effect of insulation shielding is achieved, metal wires are in a non-conducting state, the skin effect is reduced, the current-carrying capacity of the conductor is increased, the insulation layer serves as a protection layer, the insulation performance is excellent, and the shielding layer can achieve a good shielding effect.
As a preferred technical scheme of the invention, the cross section area of the conductor is 6-120 mm2For example, it may be 6mm2、10mm2、16mm2、35mm2、50mm2、70mm2、90mm2、95mm2Or 120mm2However, the numerical values recited are not intended to be limiting, and other numerical values not recited within the numerical range may be equally applicable.
Preferably, the metal strands are twisted from metal wires.
Preferably, the metal strand is formed by twisting 6 to 54 metal wires, for example, 6, 12, 18, 24, 30, 36, 42, 48 or 54 metal wires, but the number is not limited to the recited values, and other values not recited in the range of the values are also applicable, and more preferably 18 to 30 metal wires.
Preferably, the wire has a diameter of 0.5 to 1.5mm, and may be, for example, 0.5mm, 0.55mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm, but is not limited to the recited values, and other values not recited in the range of values are equally applicable.
It should be noted that, the conductor in the present invention is a multilayer structure, each composite layer is formed by twisting a plurality of metal strands, the number of the metal strands in each composite layer increases progressively from inside to outside along the radial direction, and the plurality of composite layers are sequentially stacked to obtain the conductor. The twisting direction of the metal strand is not particularly required or limited, and for example, the metal strand may be twisted from inside to outside in the radial direction, or alternatively twisted from inside to outside in the radial direction.
The thickness of the ceramic oxide film is preferably 10 to 60 μm, and may be, for example, 10 μm, 12 μm, 13 μm, 15 μm, 18 μm, 20 μm, 23 μm, 25 μm, 28 μm, 30 μm, 35 μm, 40 μm, 42 μm, 45 μm, 50 μm, 52 μm, 55 μm, 57 μm, 58 μm or 60 μm, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
Preferably, the metal wire comprises an aluminum wire.
Preferably, the ceramic oxide film comprises an alumina ceramic film.
In a preferred embodiment of the present invention, the thickness of the insulating layer is 0.3 to 0.6mm, and may be, for example, 0.3mm, 0.32mm, 0.33mm, 0.38mm, 0.4mm, 0.43mm, 0.45mm, 0.5mm, 0.53mm, 0.55mm, 0.58mm or 0.6mm, but is not limited to the above-mentioned values, and other values not mentioned in the above-mentioned range of values are also applicable, and preferably 0.35 to 0.5 mm.
Preferably, the insulating layer comprises a silicone rubber insulating layer.
In a preferred embodiment of the present invention, the shielding layer includes a tin-plated copper layer or an aluminum layer.
In a second aspect, the present invention provides a method for preparing the cable of the first aspect, the method comprising the steps of:
drawing a metal wire to obtain a metal wire, performing micro-arc oxidation to form an oxide ceramic film, twisting to form a metal strand wire, and performing regular twisting on the metal strand wire to obtain a conductor;
(II) preparing an insulating layer on the surface of the conductor in the step (I);
and (III) preparing a shielding layer on the outer surface of the insulating layer formed in the step (II) to obtain the cable.
According to a preferable technical scheme of the invention, in the step (I), 6-54 metal wires are stranded to form metal strands, the metal strands are regularly stranded to form composite layers, and the composite layers are sequentially laminated to obtain the conductor.
Preferably, in the micro-arc oxidation process, the pulse ratio of positive and negative terms is (4-6: 1), and may be, for example, 4:1, 4.5:1, 5:1, 5.5:1 or 6:1, but not limited to the values listed, and other values not listed in the range are also applicable, and more preferably 5: 1.
Preferably, in the micro-arc oxidation process, the duty ratio is (0.8-1.5): 1, and may be, for example, 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1, 1.3:1 or 1.5:1, but is not limited to the enumerated values, and other unrecited values within the numerical range are also applicable, and more preferably 1: 1.
Preferably, in the micro-arc oxidation process, the ac frequency is 45 to 60Hz, for example, 45Hz, 46Hz, 47Hz, 48Hz, 49Hz, 50Hz, 51Hz, 52Hz, 53Hz, 54Hz, 55Hz, 56Hz, 57Hz, 58Hz, 59Hz or 60Hz, but not limited to the values listed, and other values not listed in the range of values are also applicable, and more preferably 50 Hz.
Preferably, in the micro-arc oxidation process, the constant current is 3.8-5.2A/dm2For example, it may be 3.8A/dm2、3.9A/dm2、4.0A/dm2、4.1A/dm2、4.2A/dm2、4.3A/dm2、4.4A/dm2、4.5A/dm2、4.6A/dm2、4.7A/dm2、4.8A/dm2、4.9A/dm2、5.0A/dm2、5.1A/dm2Or 5.2A/dm2However, the numerical values are not limited to the numerical values listed, and other numerical values not listed in the numerical value range are also applicable, and more preferably 4.4A/dm2。
Preferably, the temperature of the cooling cycle in the micro-arc oxidation process is 20 to 30 ℃, and may be, for example, 20 ℃, 21 ℃, 22 ℃, 23 ℃, 24 ℃, 25 ℃, 26 ℃, 27 ℃, 28 ℃, 29 ℃ or 30 ℃, but is not limited to the recited values, and other values not recited in the range of the values are also applicable, and more preferably 25 ℃.
As a preferred embodiment of the present invention, in step (ii), the preparing the insulating layer includes: and extruding silicon rubber on the surface of the conductor by adopting an infrared induction heating process and vulcanizing.
Preferably, the infrared induction heating process comprises the steps of sequentially carrying out thermal shock, first-stage infrared induction heating, second-stage infrared induction heating, third-stage infrared induction heating and fourth-stage infrared induction heating, and realizing extrusion and vulcanization of the silicone rubber.
It should be noted that, in the invention, a process of thermal shock heating and four infrared induction heating is adopted, the thermal shock enables the surface of the silicon rubber to be vulcanized quickly so as to avoid surface scratch, and the subsequent four infrared induction heating can ensure the silicon rubber to be vulcanized fully.
Preferably, the thermal shock is performed in a thermal shock furnace, and the first stage infrared induction heating, the second stage infrared induction heating, the third stage infrared induction heating and the fourth stage infrared induction heating are respectively performed in an infrared induction heating furnace.
Preferably, the temperature of the thermal shock is 500 to 1000 ℃, for example, 500 ℃, 550 ℃, 600 ℃, 650 ℃, 700 ℃, 750 ℃, 800 ℃, 850 ℃, 900 ℃, 950 ℃ or 1000 ℃, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the temperature of the first stage infrared induction heating is 260 to 320 ℃, and for example, 260 ℃, 265 ℃, 270 ℃, 275 ℃, 280 ℃, 285 ℃, 290 ℃, 295 ℃, 300 ℃, 310 ℃, 315 ℃ or 320 ℃ may be used, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the temperature of the second stage infrared induction heating is 300 to 350 ℃, for example, 300 ℃, 305 ℃, 310 ℃, 315 ℃, 320 ℃, 325 ℃, 330 ℃, 335 ℃, 340 ℃, 345 ℃ or 350 ℃, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the temperature of the third stage infrared induction heating is 300 to 350 ℃, for example, 300 ℃, 305 ℃, 310 ℃, 315 ℃, 320 ℃, 325 ℃, 330 ℃, 335 ℃, 340 ℃, 345 ℃ or 350 ℃, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the temperature of the fourth stage infrared induction heating is 350 to 400 ℃, for example, 350 ℃, 355 ℃, 360 ℃, 365 ℃, 370 ℃, 375 ℃, 380 ℃, 385 ℃, 390 ℃, 395 ℃ or 400 ℃, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the operation speed of the hot drying tunnel in the infrared induction heating process is 3-10 m/min, such as 3m/min, 3.2m/min, 3.5m/min, 4m/min, 4.5m/min, 5m/min, 6m/min, 7m/min, 8m/min, 9m/min, 9.2m/min, 9.5m/min, 9.8m/min or 10m/min, but is not limited to the enumerated values, and other non-enumerated values in the numerical range are also applicable.
It should be noted that the running speed in the present invention refers to the running speed of the heat drying tunnel in the heat shock furnace or heating furnace during the preparation of the insulation layer.
In a preferred embodiment of the present invention, in step (iii), the shielding layer is made of a tin-plated copper or aluminum tube.
Preferably, the preparing the shielding layer comprises: and weaving a tinned copper wire to form a tinned copper layer, and sleeving the tinned copper layer on the outer surface of the insulating layer.
Preferably, the preparing the shielding layer comprises: and forming an oxide ceramic membrane on the surface of one side of the aluminum pipe close to the insulating layer through micro-arc oxidation to obtain an aluminum layer, and sleeving the aluminum layer on the outer surface of the insulating layer.
It should be noted that when the aluminum layer is used as the shielding layer, the aluminum pipe is subjected to micro-arc oxidation to form an oxide ceramic film on the surface of the aluminum pipe close to the insulating layer in the preparation process, so that the double-insulation effect can be achieved.
As a preferred technical scheme of the invention, the preparation method specifically comprises the following steps:
(1) obtaining aluminum wires from aluminum wire drawing, forming an aluminum oxide ceramic membrane through micro-arc oxidation, stranding 6-54 aluminum wires into strands to form metal strands, regularly stranding the metal strands to form a composite layer, and sequentially stacking the composite layer to obtain a conductor, wherein the process parameters of the micro-arc oxidation process are as follows: the positive and negative pulse ratio is (4-6): 1, the duty ratio is (0.8-1.5): 1, the alternating current frequency is 45-60 Hz, and the constant current is 3.8-5.2A/dm2The temperature of the cooling circulation is 20-30 ℃;
(2) sequentially carrying out thermal shock, first-stage infrared induction heating, second-stage infrared induction heating, third-stage infrared induction heating and fourth-stage infrared induction heating on the conductor in the step (1) to realize extrusion and vulcanization of silicon rubber on the surface of the conductor to obtain an insulating layer, wherein the temperature of the thermal shock is 500-1000 ℃, the temperature of the first-stage infrared induction heating is 260-320 ℃, the temperature of the second-stage infrared induction heating is 300-350 ℃, the temperature of the third-stage infrared induction heating is 300-350 ℃, the temperature of the fourth-stage infrared induction heating is 350-400 ℃, and the running speed is 3-10 m/min;
(3) weaving a tinned copper wire to obtain a tinned copper layer, or carrying out micro-arc oxidation on an aluminum pipe to obtain an aluminum layer, and then sleeving the tinned copper layer or the aluminum layer on the outer surface of the insulating layer formed in the step (2) to obtain the cable.
In a third aspect, the invention provides a use of the cable of the first aspect, wherein the cable is used in a new energy automobile.
The recitation of numerical ranges herein includes not only the above-recited numerical values, but also any numerical values between non-recited numerical ranges, and is not intended to be exhaustive or to limit the invention to the precise numerical values encompassed within the range for brevity and clarity.
Compared with the prior art, the invention has the beneficial effects that:
according to the cable for the new energy automobile, the preparation method and the application, the micro-arc oxidation is adopted on the surface of the conductor to form the ceramic oxide layer, so that the effect of insulation shielding is achieved, the metal wires are in a non-conducting state, the skin effect is reduced, the current-carrying capacity of the conductor is increased, the insulation layer is used as a protection layer, the insulation performance is excellent, and the shielding layer is adopted to achieve a good shielding effect.
Drawings
Fig. 1 is a schematic structural diagram of a cable for a new energy vehicle according to an embodiment of the present invention.
Wherein, 1-conductor; 2-an insulating layer; and 3, a shielding layer.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
In a specific embodiment, the invention provides a cable for a new energy automobile, as shown in fig. 1, the cable includes a conductor 1, an insulating layer 2 and a shielding layer 3 are sequentially stacked on an outer surface of the conductor 1, the conductor 1 includes at least two composite layers sequentially stacked from inside to outside along a radial direction, the composite layers are formed by twisting at least one metal strand, and an outer surface of the metal strand is subjected to micro-arc oxidation to form an oxide ceramic film.
Further, the cross section area of the conductor 1 is 6-120 mm2。
The metal strand wires are twisted by metal wires.
The metal strand wires are formed by twisting 6-54 metal wires, and the preferable number is 18-30.
The diameter of the metal wire is 0.5-1.5 mm. The thickness of the oxide ceramic film is 10-60 mu m.
The metal wire comprises an aluminum wire. The ceramic oxide film comprises an aluminum oxide ceramic film.
Further, the thickness of the insulating layer 2 is 0.3-0.6 mm, preferably 0.35-0.5 mm.
The insulating layer 2 comprises a silicon rubber insulating layer 2.
Further, the shielding layer 3 comprises a tin-plated copper layer or an aluminum layer.
In another embodiment, the present invention provides a method of making a cable according to one embodiment, the method comprising the steps of:
(1) obtaining aluminum wires from aluminum wire drawing, forming an aluminum oxide ceramic membrane through micro-arc oxidation, stranding 6-54 aluminum wires into strands to form metal strands, regularly stranding the metal strands to form a composite layer, and sequentially stacking the composite layer to obtain a conductor 1, wherein the process parameters of the micro-arc oxidation process are as follows: the positive and negative pulse ratio is (4-6): 1, the duty ratio is (0.8-1.5): 1, the alternating current frequency is 45-60 Hz, and the constant current is 3.8-5.2A/dm2The temperature of the cooling circulation is 20-30 ℃;
(2) sequentially carrying out thermal shock, first-stage infrared induction heating, second-stage infrared induction heating, third-stage infrared induction heating and fourth-stage infrared induction heating on the conductor 1 in the step (1) to realize extrusion and vulcanization of silicon rubber on the surface of the conductor 1, so as to obtain the insulating layer 2, wherein the thermal shock temperature is 500-1000 ℃, the first-stage infrared induction heating temperature is 260-320 ℃, the second-stage infrared induction heating temperature is 300-350 ℃, the third-stage infrared induction heating temperature is 300-350 ℃, the fourth-stage infrared induction heating temperature is 350-400 ℃, and the running speed is 3-10 m/min;
(3) weaving a tinned copper wire to obtain a tinned copper layer, or carrying out micro-arc oxidation on the surface of one side, close to the insulating layer 2, of the aluminum pipe to form a ceramic oxide film to obtain an aluminum layer, and then sleeving the tinned copper layer or the aluminum layer on the outer surface of the insulating layer 2 formed in the step (2) to obtain the cable.
Example 1
The embodiment provides a cable for new energy automobile, including conductor 1, wherein the cross sectional area of conductor 1 is 120mm2The conductor 1 comprises composite layers which are sequentially laminated from inside to outside in the radial directionThe composite layers are formed by regularly twisting metal strand wires, and the number of the metal strand wires of each composite layer increases from inside to outside along the radial direction. Each metal strand wire is formed by twisting 24 aluminum wires, the diameter of each aluminum wire is 1mm, and the outer surfaces of the aluminum wires are subjected to micro-arc oxidation to form an aluminum oxide ceramic membrane with the thickness of 30 mu m. The outer surface of the conductor 1 is sequentially laminated with an insulating layer 2 and a shielding layer 3, the thickness of the insulating layer 2 is 0.4mm, the insulating layer 2 is a silicon rubber insulating layer 2, and the shielding layer 3 is an aluminum layer.
The preparation method of the cable comprises the following steps:
(1) obtaining aluminum wires from aluminum wire drawing, forming an aluminum oxide ceramic membrane through micro-arc oxidation, twisting 24 aluminum wires into strands to form metal strands, regularly twisting the metal strands to form a composite layer, and sequentially stacking the composite layer to obtain a conductor 1, wherein the process parameters of the micro-arc oxidation process are as follows: the pulse ratio of positive and negative terms is 5:1, the duty ratio is 1:1, the alternating current frequency is 50Hz, and the constant current is 4.4A/dm2The temperature of the cooling cycle is 25 ℃;
(2) sequentially carrying out thermal shock, first-stage infrared induction heating, second-stage infrared induction heating, third-stage infrared induction heating and fourth-stage infrared induction heating on the conductor 1 in the step (1) to realize extrusion and vulcanization of silicon rubber on the surface of the conductor 1 to obtain an insulating layer 2, wherein the thermal shock temperature is 900 ℃, the first-stage infrared induction heating temperature is 300 ℃, the second-stage infrared induction heating temperature is 325 ℃, the third-stage infrared induction heating temperature is 330 ℃, the fourth-stage infrared induction heating temperature is 380 ℃, and the running speed is 5.5 m/min;
(3) and forming an alumina membrane on the surface of one side of the aluminum pipe close to the insulating layer 2 through micro-arc oxidation to obtain an aluminum layer as a shielding layer 3, and sleeving the shielding layer 3 on the outer surface of the insulating layer 2 to obtain the cable.
Example 2
The embodiment provides a cable for new energy automobile, including conductor 1, wherein the cross sectional area of conductor 1 is 6mm2The conductor 1 comprises composite layers which are sequentially laminated from inside to outside along the radial direction, the composite layers are formed by regularly twisting metal strand wires from inside to outside along the radial direction,the number of metal strands per composite layer increases. Each metal strand wire is formed by twisting 6 aluminum wires, the diameter of each aluminum wire is 0.5mm, and the outer surfaces of the aluminum wires are subjected to micro-arc oxidation to form an aluminum oxide ceramic membrane with the thickness of 10 mu m. The outer surface of the conductor 1 is sequentially laminated with an insulating layer 2 and a shielding layer 3, the thickness of the insulating layer 2 is 0.3mm, the insulating layer 2 is a silicon rubber insulating layer 2, and the shielding layer 3 is an aluminum layer.
The preparation method of the cable comprises the following steps:
(1) obtaining aluminum wires from aluminum wire drawing, forming an aluminum oxide ceramic membrane through micro-arc oxidation, twisting 6 aluminum wires into strands to form metal strands, regularly twisting the metal strands to form a composite layer, and sequentially stacking the composite layer to obtain a conductor 1, wherein the process parameters of the micro-arc oxidation process are as follows: the pulse ratio of positive and negative terms is 4:1, the duty ratio is 0.8:1, the alternating current frequency is 45Hz, and the constant current is 3.8A/dm2The temperature of the cooling cycle is 20 ℃;
(2) sequentially carrying out thermal shock, first-stage infrared induction heating, second-stage infrared induction heating, third-stage infrared induction heating and fourth-stage infrared induction heating on the conductor 1 in the step (1) to realize extrusion and vulcanization of silicon rubber on the surface of the conductor 1 to obtain an insulating layer 2, wherein the thermal shock temperature is 500 ℃, the first-stage infrared induction heating temperature is 260 ℃, the second-stage infrared induction heating temperature is 300 ℃, the third-stage infrared induction heating temperature is 300 ℃, the fourth-stage infrared induction heating temperature is 350 ℃, and the running speed is 5.5 m/min;
(3) weaving the tinned copper wire to form a tinned copper layer, and sleeving the tinned copper layer on the outer surface of the insulating layer 2 to obtain the cable.
Example 3
The embodiment provides a cable for new energy automobile, including conductor 1, wherein the cross sectional area of conductor 1 is 35mm2The conductor 1 comprises composite layers which are sequentially stacked from inside to outside along the radial direction, the composite layers are formed by regularly twisting metal strand wires, and the number of the metal strand wires of each composite layer increases progressively from inside to outside along the radial direction. Each metal strand wire is formed by twisting 18 aluminum wires, the diameter of each aluminum wire is 0.8mm,the outer surface of the aluminum wire is micro-arc oxidized to form an aluminum oxide ceramic membrane with the thickness of 20 mu m. The outer surface of the conductor 1 is sequentially laminated with an insulating layer 2 and a shielding layer 3, the thickness of the insulating layer 2 is 0.35mm, the insulating layer 2 is a silicon rubber insulating layer 2, and the shielding layer 3 is an aluminum layer.
The preparation method of the cable comprises the following steps:
(1) the method comprises the following steps of (1) drawing an aluminum wire to obtain an aluminum wire, forming an aluminum oxide ceramic membrane through micro-arc oxidation, stranding 18 aluminum wires to form strands to form metal strands, regularly stranding the metal strands to form a composite layer, and sequentially stacking the composite layer to obtain a conductor 1, wherein the process parameters of the micro-arc oxidation process are as follows: the pulse ratio of positive and negative terms is 4.5:1, the duty ratio is 0.9:1, the alternating current frequency is 48Hz, and the constant current is 4A/dm2The temperature of the cooling cycle is 25 ℃;
(2) sequentially carrying out thermal shock, first-stage infrared induction heating, second-stage infrared induction heating, third-stage infrared induction heating and fourth-stage infrared induction heating on the conductor 1 in the step (1) to realize extrusion and vulcanization of silicon rubber on the surface of the conductor 1 to obtain an insulating layer 2, wherein the thermal shock temperature is 800 ℃, the first-stage infrared induction heating temperature is 280 ℃, the second-stage infrared induction heating temperature is 310 ℃, the third-stage infrared induction heating temperature is 330 ℃, the fourth-stage infrared induction heating temperature is 365 ℃, and the running speed is 4 m/min;
(3) and forming an alumina membrane on the surface of one side of the aluminum pipe close to the insulating layer 2 through micro-arc oxidation to obtain an aluminum layer as a shielding layer 3, and sleeving the shielding layer 3 on the outer surface of the insulating layer 2 to obtain the cable.
Example 4
The embodiment provides a cable for new energy automobile, including conductor 1, wherein the cross sectional area of conductor 1 is 95mm2The conductor 1 comprises composite layers which are sequentially stacked from inside to outside along the radial direction, the composite layers are formed by regularly twisting metal strand wires, and the number of the metal strand wires of each composite layer increases progressively from inside to outside along the radial direction. Each metal strand wire is formed by twisting 30 aluminum wires, the diameter of each aluminum wire is 1.2mm, and the outer surfaces of the aluminum wires are subjected to micro-arc oxidation to form aluminum oxide ceramics with the thickness of 50 mu mA ceramic film. The outer surface of the conductor 1 is sequentially laminated with an insulating layer 2 and a shielding layer 3, the thickness of the insulating layer 2 is 0.45mm, the insulating layer 2 is a silicon rubber insulating layer 2, and the shielding layer 3 is an aluminum layer.
The preparation method of the cable comprises the following steps:
(1) obtaining aluminum wires from aluminum wire drawing, forming an aluminum oxide ceramic membrane through micro-arc oxidation, twisting 30 aluminum wires into strands to form metal strands, regularly twisting the metal strands to form a composite layer, and sequentially stacking the composite layer to obtain a conductor 1, wherein the process parameters of the micro-arc oxidation process are as follows: the pulse ratio of positive and negative terms is 5:1, the duty ratio is 1:1, the alternating current frequency is 55Hz, and the constant current is 5A/dm2The temperature of the cooling cycle was 28 ℃;
(2) sequentially carrying out thermal shock, first-stage infrared induction heating, second-stage infrared induction heating, third-stage infrared induction heating and fourth-stage infrared induction heating on the conductor 1 in the step (1) to realize extrusion and vulcanization of silicon rubber on the surface of the conductor 1 to obtain an insulating layer 2, wherein the thermal shock temperature is 700 ℃, the first-stage infrared induction heating temperature is 310 ℃, the second-stage infrared induction heating temperature is 340 ℃, the third-stage infrared induction heating temperature is 340 ℃, the fourth-stage infrared induction heating temperature is 380 ℃, and the running speed is 8 m/min;
(3) and forming an alumina membrane on the surface of one side of the aluminum pipe close to the insulating layer 2 through micro-arc oxidation to obtain an aluminum layer as a shielding layer 3, and sleeving the shielding layer 3 on the outer surface of the insulating layer 2 to obtain the cable.
Example 5
The embodiment provides a cable for new energy automobile, including conductor 1, wherein the cross sectional area of conductor 1 is 120mm2The conductor 1 comprises composite layers which are sequentially stacked from inside to outside along the radial direction, the composite layers are formed by regularly twisting metal strand wires, and the number of the metal strand wires of each composite layer increases progressively from inside to outside along the radial direction. Each metal strand wire is formed by twisting 54 aluminum wires, the diameter of each aluminum wire is 0.8mm, and the outer surfaces of the aluminum wires are subjected to micro-arc oxidation to form an aluminum oxide ceramic membrane with the thickness of 58 mu m. An insulating layer 2 and a shielding layer 3 are sequentially laminated on the outer surface of the conductor 1 for insulationThe thickness of layer 2 is 0.45mm, and insulating layer 2 adopts silicon rubber insulating layer 2, and shielding layer 3 is the aluminium layer.
The preparation method of the cable comprises the following steps:
(1) the method comprises the following steps of (1) drawing an aluminum wire to obtain an aluminum wire, forming an aluminum oxide ceramic membrane through micro-arc oxidation, stranding 54 aluminum wires to form strands to form metal strands, regularly stranding the metal strands to form a composite layer, and sequentially stacking the composite layer to obtain a conductor 1, wherein the process parameters of the micro-arc oxidation process are as follows: the pulse ratio of positive and negative terms is 6:1, the duty ratio is 1:1, the alternating current frequency is 60Hz, and the constant current is 5.2A/dm2The temperature of the cooling cycle is 30 ℃;
(2) sequentially carrying out thermal shock, first-stage infrared induction heating, second-stage infrared induction heating, third-stage infrared induction heating and fourth-stage infrared induction heating on the conductor 1 in the step (1) to realize extrusion and vulcanization of silicon rubber on the surface of the conductor 1 to obtain an insulating layer 2, wherein the thermal shock temperature is 1000 ℃, the first-stage infrared induction heating temperature is 320 ℃, the second-stage infrared induction heating temperature is 350 ℃, the third-stage infrared induction heating temperature is 350 ℃, the fourth-stage infrared induction heating temperature is 400 ℃, and the running speed is 9 m/min;
(3) weaving the tinned copper wire to form a tinned copper layer, and sleeving the tinned copper layer on the outer surface of the insulating layer 2 to obtain the cable.
Example 6
This example provides a cable for a new energy automobile, which is different from example 1 in that the thickness of the alumina ceramic film in the conductor 1 is 5 μm, and the rest of the process parameters and the operating conditions are exactly the same as those in example 1.
Example 7
This example provides a cable for a new energy automobile, which is different from example 1 in that the thickness of the alumina ceramic film in the conductor 1 is 75 μm, and the remaining process parameters and operating conditions are exactly the same as those in example 1.
Comparative example 1
The comparative example provides a cable for a new energy automobile, which is different from example 1 in that micro-arc oxidation is not performed in the preparation process of the conductor 1 in the step (1), that is, an alumina ceramic film is not formed on the outer surface of an aluminum wire, and the rest of process parameters and operating conditions are completely the same as those in example 1.
Comparative example 2
This comparative example provides a cable for a new energy automobile, which is different from example 1 in that a thermal shock process is not performed during the preparation of the insulating layer 2 in step (2), and the remaining process parameters and operating conditions are completely the same as those of example 1.
Comparative example 3
This comparative example provides a cable for a new energy automobile, which is different from example 1 in that in the preparation of the insulating layer 2 in the step (2), the thermal shock process is replaced by infrared induction heating at 400 ℃, and the remaining process parameters and operating conditions are completely the same as those of example 1.
Comparative example 4
This comparative example provides a cable for a new energy automobile, which is different from example 1 in that a fourth stage infrared induction heating process is not performed in the preparation process of the insulating layer 2 in the step (2), and the remaining process parameters and operating conditions are completely the same as those of example 1.
Comparative example 5
The comparative example provides a cable for a new energy automobile, which is different from the cable in example 1 in that the micro-arc oxidation is not performed on the surface of the aluminum pipe in the preparation process of the shielding layer 3 in the step (3), i.e., no oxide ceramic film is formed on the surface of one side of the aluminum pipe close to the insulating layer 2, and the rest of process parameters and operating conditions are completely the same as those in example 1.
And (3) performance testing:
the electrical resistivity of the conductor 1 of the cables of examples 1 to 7 and comparative examples 1 to 5 was measured at a temperature of 20 ℃ and the results are shown in table 1:
TABLE 1
The temperature of the surface of the cable (1 hour of temperature rise) was measured at a rated voltage of 8.5/10kV for the cables of examples 1, 6 to 7 and comparative examples 1 to 5 at different test currents, and the results are shown in Table 2:
TABLE 2
As can be seen from table 1, the conductors 1 of the cables for new energy vehicles provided in examples 1 to 7 of the present invention have a lower resistivity, and the resistivity of the conductors 1 in comparative example 1 is higher than that of the conductors 1 in examples 1 to 7, because the aluminum wire outer surface of comparative example 1 does not form the oxide ceramic film, and the cables of examples 1 to 7 adopt micro-arc oxidation to form the oxide ceramic film on the surface of the conductor 1, so as to achieve the effect of insulation and shielding, and make the metal wires in a non-conductive state, thereby reducing the resistivity of the conductor 1. The resistivity of the conductor 1 obtained in examples 6 and 7 was improved compared to that of example 1, because the ceramic layer easily fell off and a good insulating effect could not be obtained when the thickness of the ceramic oxide film formed on the surface of the aluminum wire in example 6 was too low, resulting in an increase in the resistivity of the conductor 1; in addition, in example 7, when the thickness of the ceramic oxide film formed on the surface of the aluminum wire is too high, poor heat dissipation of the conductor is caused, the current-carrying capacity of the cable is further affected, and the resistivity of the conductor 1 is also increased.
As can be seen from table 2, compared to example 1, the temperature of the surface of the cable obtained in example 6 is higher than that of example 1 at different test currents, because when the thickness of the oxide ceramic film formed on the surface of the aluminum wire in example 6 is too low, the oxide film cannot be effectively formed on the surface of the conductor 1, so that the skin effect cannot be effectively reduced, the resistance of the conductor 1 is increased, the resistivity of the conductor 1 is increased, and accordingly, the power loss is increased, and the temperature is increased; compared with example 1, the cable obtained in example 7 has insignificant temperature change on the surface, and the skin effect is not significantly reduced even when the thickness of the ceramic oxide film formed on the surface of the aluminum wire is increased.
Compared with the embodiment 1, under different test currents, the temperature of the surface of the cable obtained in the comparative example 1 is higher than that of the cable obtained in the embodiment 1, because no alumina ceramic film is formed on the outer side surface of the aluminum wire in the comparative example 1, the cable obtained in the embodiment 1 adopts micro-arc oxidation to form the alumina ceramic film on the surface of the conductor 1, the skin effect is reduced, the heat conductivity coefficient is increased, the temperature is prevented from rising too fast, and the current-carrying capacity of the conductor 1 is increased.
As can be seen from table 2, the temperature of the surface of the cable obtained in comparative example 2 is higher than that of example 1 under different current conditions, because thermal shock is not performed in the preparation process of the insulating layer 2 in comparative example 2, and the vulcanization speed of the surface of the silicone rubber is slow, thereby affecting the insulating effect of the insulating layer 2. In addition, the surface temperature of the cable obtained in comparative example 3 is higher than that of example 1 under different current conditions, because in the preparation process of the insulating layer 2, the infrared induction heating at 400 ℃ is adopted to replace thermal shock, so that the surface vulcanization speed of the silicone rubber is also reduced, and the insulating effect of the insulating layer 2 is further influenced. Comparative example 4 the temperature of the surface of the cable obtained is higher than that of example 1 under different current conditions, because the fourth stage infrared induction heating process is not carried out in the preparation process of the insulating layer 2, the vulcanization of the silicone rubber on the surface of the conductor 1 is insufficient, and the insulating effect of the insulating layer 2 is further influenced.
Compared with the embodiment 1, the temperature of the surface of the cable obtained in the comparative example 5 is slightly increased, because the micro-arc oxidation is carried out on the surface of the aluminum pipe in the preparation process of the shielding layer 3 in the embodiment 1, the double-insulation effect is achieved, and the shielding effect of the cable is improved.
According to the cable for the new energy automobile, the surface of the conductor 1 is subjected to micro-arc oxidation to form the ceramic oxide layer, so that the effect of insulation shielding is achieved, metal wires are in a non-conducting state, the skin effect is reduced, the current-carrying capacity of the conductor 1 is increased, the insulation layer 2 serves as a protection layer, the insulation performance is excellent, and the shielding layer 3 is adopted to achieve a good shielding effect.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The cable for the new energy automobile is characterized by comprising a conductor, wherein an insulating layer and a shielding layer are sequentially stacked on the outer surface of the conductor, the conductor comprises at least two composite layers which are sequentially stacked from inside to outside along the radial direction, the composite layers are formed by twisting at least one metal strand, and the outer surface of the metal strand is subjected to micro-arc oxidation to form an oxide ceramic membrane.
2. The cable of claim 1, wherein the cross-sectional area of the conductor is 6-120 mm2；
Preferably, the metal strand is twisted by metal wires;
preferably, the metal strand wires are formed by twisting 6-54 metal wires, and more preferably 18-30 metal wires;
preferably, the diameter of the metal wire is 0.5-1.5 mm;
preferably, the thickness of the oxide ceramic film is 10-60 μm;
preferably, the metal wire comprises an aluminum wire;
preferably, the ceramic oxide film comprises an alumina ceramic film.
3. A cable according to claim 1 or 2, wherein the insulating layer has a thickness of 0.3 to 0.6mm, preferably 0.35 to 0.5 mm;
preferably, the insulating layer comprises a silicone rubber insulating layer.
4. A cable according to any one of claims 1 to 3 wherein the shielding layer comprises a tin-plated copper layer or an aluminum layer.
5. A method for preparing a cable according to any one of claims 1 to 4, characterized in that it comprises the following steps:
drawing a metal wire to obtain a metal wire, performing micro-arc oxidation to form an oxide ceramic film, twisting to form a metal strand wire, and performing regular twisting on the metal strand wire to obtain a conductor;
(II) preparing an insulating layer on the surface of the conductor in the step (I);
and (III) preparing a shielding layer on the outer surface of the insulating layer formed in the step (II) to obtain the cable.
6. The preparation method of the conductor according to claim 5, wherein in the step (I), 6 to 54 metal wires are stranded to form metal strands, the metal strands are regularly stranded to form composite layers, and the composite layers are sequentially laminated to obtain the conductor;
preferably, in the micro-arc oxidation process, the pulse ratio of positive and negative terms is (4-6): 1, and further preferably 5: 1;
preferably, in the micro-arc oxidation process, the duty ratio is (0.8-1.5): 1, and more preferably 1: 1;
preferably, in the micro-arc oxidation process, the alternating current frequency is 45-60 Hz, and further preferably 50 Hz;
preferably, in the micro-arc oxidation process, the constant current is 3.8-5.2A/dm2More preferably 4.4A/dm2；
Preferably, in the micro-arc oxidation process, the temperature of the cooling circulation is 20-30 ℃, and further preferably 25 ℃.
7. The method according to claim 5 or 6, wherein in the step (II), the preparing the insulating layer comprises: extruding silicon rubber on the surface of the conductor by adopting an infrared induction heating process and vulcanizing;
preferably, the infrared induction heating process comprises the steps of sequentially carrying out thermal shock, first-stage infrared induction heating, second-stage infrared induction heating, third-stage infrared induction heating and fourth-stage infrared induction heating to realize extrusion and vulcanization of the silicone rubber;
preferably, the thermal shock is performed in a thermal shock furnace, and the first section of infrared induction heating, the second section of infrared induction heating, the third section of infrared induction heating and the fourth section of infrared induction heating are respectively performed in an infrared induction heating furnace;
preferably, the temperature of the thermal shock is 500-1000 ℃;
preferably, the temperature of the first section of infrared induction heating is 260-320 ℃;
preferably, the temperature of the second-stage infrared induction heating is 300-350 ℃;
preferably, the temperature of the third-stage infrared induction heating is 300-350 ℃;
preferably, the temperature of the fourth-stage infrared induction heating is 350-400 ℃;
preferably, the running speed of the hot drying tunnel in the infrared induction heating process is 3-10 m/min.
8. The production method according to any one of claims 5 to 7, wherein, in the step (III), the shield layer is produced using a tin-plated copper or aluminum tube;
preferably, the preparing the shielding layer comprises: weaving a tinned copper wire to form a tinned copper layer, and sleeving the tinned copper layer on the outer surface of the insulating layer;
preferably, the preparing the shielding layer comprises: and forming an oxide ceramic membrane on the surface of one side of the aluminum pipe close to the insulating layer through micro-arc oxidation to obtain an aluminum layer, and sleeving the aluminum layer on the outer surface of the insulating layer.
9. The method according to any one of claims 5 to 8, comprising in particular the steps of:
(1) drawing an aluminum wire to obtain an aluminum wire, forming an aluminum oxide ceramic membrane through micro-arc oxidation, and then carrying out micro-arc oxidation on the aluminum wire to obtain the aluminum wireStranding 6-54 aluminum wires into strands to form metal strands, regularly stranding the metal strands to form composite layers, and sequentially stacking the composite layers to obtain a conductor, wherein the process parameters of the micro-arc oxidation process are as follows: the positive and negative pulse ratio is (4-6): 1, the duty ratio is (0.8-1.5): 1, the alternating current frequency is 45-60 Hz, and the constant current is 3.8-5.2A/dm2The temperature of the cooling circulation is 20-30 ℃;
(2) sequentially carrying out thermal shock, first-stage infrared induction heating, second-stage infrared induction heating, third-stage infrared induction heating and fourth-stage infrared induction heating on the conductor in the step (1) to realize extrusion and vulcanization of silicon rubber on the surface of the conductor to obtain an insulating layer, wherein the temperature of the thermal shock is 500-1000 ℃, the temperature of the first-stage infrared induction heating is 260-320 ℃, the temperature of the second-stage infrared induction heating is 300-350 ℃, the temperature of the third-stage infrared induction heating is 300-350 ℃, the temperature of the fourth-stage infrared induction heating is 350-400 ℃, and the running speed is 3-10 m/min;
(3) weaving a tinned copper wire to obtain a tinned copper layer, or carrying out micro-arc oxidation on an aluminum pipe to obtain an aluminum layer, and then sleeving the tinned copper layer or the aluminum layer on the outer surface of the insulating layer formed in the step (2) to obtain the cable.
10. Use of a cable according to any of claims 1-4, wherein the cable is used in a new energy automobile.
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| CN111893540A (en) * | 2020-07-15 | 2020-11-06 | 东莞理工学院 | Preparation method of aluminum-silicon alloy micro-arc oxidation film layer |
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| US20110079410A1 (en) * | 2009-10-05 | 2011-04-07 | Hitachi Cable, Ltd. | Shielded cable |
| CN103952742A (en) * | 2014-04-22 | 2014-07-30 | 上海理工大学 | Copper lead with insulating layer and preparation method thereof |
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