New energy aluminum busbar cable and preparation method thereof

Abstract

A new energy aluminum cable and a preparation method thereof belong to the technical field of cables and include a cable core and a protective layer. The cable core includes a conductor and an insulation layer. The preparation raw material of the conductor includes 100 parts of 6063 aluminum alloy, 2-10 parts of magnesium neodymium intermediate alloy and 0.5-6 parts of aluminum scandium intermediate alloy. The material of the insulation layer is modified polytetrafluoroethylene. The preparation method of the new energy aluminum cable includes the following steps: S1. extruding the insulation layer on the outside of the conductor to obtain the cable core; S2. wrapping the shielding layer and the protective sleeve on the outside of the cable core in sequence to obtain the new energy aluminum cable. The new energy aluminum cable has good electrical conductivity and mechanical strength and can still maintain good stability at high temperatures.

Description

Technical Field

[0001] This invention belongs to the field of cable technology, specifically a new energy aluminum busbar cable and its preparation method. Background Technology

[0002] With the rapid development of the new energy industry, wind power generation, solar power generation, and new energy vehicle charging facilities are placing higher demands on power transmission systems. However, traditional cables are gradually revealing numerous problems when dealing with these new energy scenarios. For example, in high-current transmission, traditional cables have high resistance, leading to significant energy loss and reduced energy efficiency. Furthermore, in complex outdoor environments or locations with frequent vibrations, traditional cables lack sufficient mechanical properties, making them prone to insulation damage and conductor breakage, thus affecting the stability and reliability of power transmission.

[0003] Furthermore, with the large-scale construction of new energy facilities, cost control of cables has become crucial. However, traditional cables struggle to effectively reduce costs while maintaining performance in terms of materials and manufacturing processes. Summary of the Invention

[0004] This invention overcomes the shortcomings of existing new energy aluminum busbar cables, such as poor conductivity, severe power loss, and low mechanical strength leading to cable damage. Therefore, it provides a new energy aluminum busbar cable and its manufacturing method. The new energy aluminum busbar cable of this invention exhibits good conductivity and mechanical strength, and maintains good stability even at high temperatures.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions.

[0006] The new energy aluminum busbar cable of the present invention includes a cable core and a protective layer;

[0007] The cable core includes a conductor and an insulation layer;

[0008] The raw materials for preparing the conductor include: 100 parts of 6063 aluminum alloy, 2-10 parts of magnesium-neodymium master alloy, and 0.5-6 parts of aluminum-scandium master alloy.

[0009] Preferably, the raw materials for preparing the conductor include: 100 parts of 6063 aluminum alloy, 3 to 8 parts of magnesium-neodymium master alloy and 1 to 4 parts of aluminum-scandium master alloy;

[0010] The insulating layer is made of modified polytetrafluoroethylene, which comprises the following raw materials in parts by weight: 60-95 parts polytetrafluoroethylene, 30-70 parts methyl vinyl silicone rubber, 5-17 parts isocyanate silane, 2-8 parts hydrotalcite, 5-30 parts flame retardant and 0.5-2 parts lubricant.

[0011] Preferably, the modified polytetrafluoroethylene comprises the following raw materials in parts by weight: 80-95 parts polytetrafluoroethylene, 30-50 parts methyl vinyl silicone rubber, 7-13 parts isocyanate silane, 2-8 parts hydrotalcite, 10-20 parts flame retardant, and 0.5-2 parts lubricant.

[0012] In some preferred embodiments, the neodymium content in the magnesium-neodymium master alloy is 10-16%, more preferably 13-15%.

[0013] In some preferred embodiments, the scandium content in the aluminum-scandium master alloy is 2-10%, more preferably 5-10%.

[0014] In some preferred embodiments, the 6063 aluminum alloy comprises the following elements by mass percentage: 0.45~0.95%Mg, 0.2~0.6%Si, Fe≤0.3%, Cu≤0.1%, Mn≤0.1%, Cr≤0.1%, Zn≤0.1%, and Ti≤0.1%.

[0015] In some preferred embodiments, the aspect ratio of the conductor is ≥9.0, and more preferably, the aspect ratio of the conductor is 10.0~15.0.

[0016] The conductor of this invention has a relatively flat cross-section, which alters the distribution of the magnetic field. When current flows through the flat conductor, the magnetic field is distributed more evenly across the conductor's plane, reducing the uneven distribution of internal self-induced electromotive force compared to a circular conductor. Thus, the current is not excessively concentrated at the edges as in a circular conductor, but rather distributed more evenly across the entire cross-section of the flat conductor, thereby reducing the skin effect.

[0017] In some preferred embodiments, the D50 of the polytetrafluoroethylene is 25~35μm.

[0018] In some preferred embodiments, the vinyl content of the methyl vinyl silicone rubber is 0.13~0.20%.

[0019] In some preferred embodiments, the methyl vinyl silicone rubber is methyl-terminated.

[0020] In some preferred embodiments, the relative molecular weight of the methyl vinyl silicone rubber is 400,000 to 800,000.

[0021] In some preferred embodiments, the isocyanate silane is 3-isocyanate propyltrimethoxysilane (CAS No.: 15396-00-6) or 3-isocyanate propyltriethoxysilane (CAS No.: 24801-88-5).

[0022] In some preferred embodiments, the flame retardant is aluminum hydroxide or decabromodiphenyl ether.

[0023] In some preferred embodiments, the current carrying density of the conductor is 3.1~3.5 A / mm². 2 .

[0024] In some preferred embodiments, the tensile strength of the conductor is 362~374 MPa.

[0025] In some preferred embodiments, the elongation at break of the insulating layer is >90%.

[0026] In some preferred embodiments, the volume resistivity of the insulating layer is >3×10⁻⁶. 15 Ω·cm, preferably 3.1×10 15 ~3.5×10 15 Ω·cm.

[0027] In some preferred embodiments, the protective layer comprises, from the inside out, a shielding layer and a protective sleeve.

[0028] In some preferred embodiments, the inner layer of the shielding layer is a braided copper wire, the middle layer is a permalloy powder filling layer, and the outer layer is an aluminum-plastic composite shielding tape.

[0029] Furthermore, the aluminum-plastic composite strip includes aluminum strip laminated with ethylene and acrylic copolymer (EAA) on one or both sides.

[0030] In some preferred embodiments, the raw materials for preparing the protective sleeve include TPE (thermoplastic elastomer), SBS (styrene-butadiene-styrene block copolymer), and PP (polypropylene);

[0031] Preferably, the raw materials for preparing the protective cover also include flame retardants and anti-aging agents.

[0032] In some preferred embodiments, the protective cover is made from 50-70 parts TPE, 20-30 parts SBS, 40-50 parts PP, 20-35 parts flame retardant and 0.2-1 parts anti-aging agent.

[0033] The aforementioned method for preparing new energy aluminum busbar cables includes the following steps:

[0034] S1. The insulation layer is extruded onto the outside of the conductor to obtain the cable core;

[0035] S2. A shielding layer and a protective sleeve are wrapped around the outside of the cable core in sequence to obtain a new energy aluminum busbar cable.

[0036] In S1, the method for preparing the conductor includes the following steps: melting, casting and rolling the raw materials for preparing the conductor, homogenizing and annealing, extruding and drawing, and aging treatment.

[0037] In further step S1, the melting temperature is 700~730℃ and the time is 4~8h.

[0038] In further step S1, the melting is carried out under argon protection.

[0039] In step S1, the homogenization annealing temperature is 550~560℃ and the time is 0.5~1h.

[0040] In further step S1, the aging treatment is carried out at a temperature of 160~170℃ for 6~7 hours.

[0041] In further step S1, the drawing speed of the extrusion drawing is 1.0~2.0m / min.

[0042] Further in S1, the aging treatment also includes a smoothing process to reduce minor protrusions and depressions on the surface. When alternating current passes through, uneven areas generate localized magnetic field changes, which exacerbate the skin effect. A smooth surface reduces these localized magnetic field changes caused by surface unevenness, allowing the current to be distributed more evenly on the conductor surface, further reducing the skin effect.

[0043] In this invention, the magnesium-neodymium master alloy possesses excellent electrical and thermal conductivity, and is lightweight yet high-strength. The aluminum-scandium master alloy exhibits a strong grain-refining mechanism in aluminum alloys, significantly improving the material's thermal stability and mechanical properties. Specifically, in the magnesium-neodymium master alloy, magnesium significantly enhances the tensile strength of the conductor through solid solution and aging mechanisms, while neodymium promotes hardening during aging, forming a stable precipitate phase, thereby improving the alloy's corrosion resistance and thermal stability. In the aluminum-scandium master alloy, scandium enhances the tensile strength of the aluminum alloy through grain refinement and precipitation strengthening mechanisms.

[0044] In S1, the modified polytetrafluoroethylene includes the following steps: mixing and dispersing the raw materials for preparing the modified polytetrafluoroethylene, internal mixing, extrusion molding, rapid cooling, and hot vulcanization.

[0045] Further in S1, the polytetrafluoroethylene (PTFE) needs to undergo pretreatment. The pretreatment step involves surface-treating the PTFE and then spraying an isocyanate-based silane solution onto the PTFE surface and reacting for 0.5 to 1 hour. The surface treatment includes cleaning and drying steps to remove impurities and oil.

[0046] Further in S1, the mixing and dispersion process involves stirring at 500-2000 rpm for 5-10 minutes and at 1000-2000 rpm for 15-30 minutes.

[0047] In further step S1, the mixing temperature is 150~180℃, the mixing speed is 30~60rpm, and the mixing time is 15~30min.

[0048] Further in S1, the extrusion molding process is a multi-layer extrusion process.

[0049] Further in S1, the initial temperature of the extrusion molding is 100~150℃ and the final temperature is 180~220℃.

[0050] In further step S1, the extrusion speed of the extrusion molding is 20~60 rpm.

[0051] Further in S1, the rapid cooling method is water cooling, and the temperature of the cooling water is controlled at 5~15℃.

[0052] In further step S1, the temperature of the thermal vulcanization is 150~180℃ and the time is 10~30min.

[0053] In this invention, the silane portion of the isocyanate-based silane can form a strong interaction with the carbon-fluorine bonds in polytetrafluoroethylene (PTFE), while its isocyanate portion can react with the hydroxyl groups in silicone rubber. This dual effect improves the compatibility of the two materials and also enhances their mechanical properties. Hydrotalcite, as an inorganic filler, can improve the material's wear resistance and flame retardancy. The multilayer extrusion process can effectively control the material's density distribution and surface quality, ensuring the consistency of the insulation layer. Furthermore, each extruded layer undergoes a rapid cooling step, reducing stress concentration problems caused by excessively slow cooling during the molding process.

[0054] In S2, the outer surface of the protective sleeve has anti-slip texture.

[0055] In S2, after the wrapping shielding layer and protective sleeve are applied, post-processing is also included, which includes cooling, sizing and winding processes.

[0056] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0057] Compared with the prior art, the beneficial effects of the present invention are:

[0058] 1. The conductor of this invention is used in new energy aluminum busbar cables by proportioning 6063 aluminum alloy, magnesium-neodymium master alloy, and aluminum-scandium master alloy. In the conductor of this invention, the magnesium-neodymium master alloy is lightweight and high-strength; magnesium can strengthen solid solution, and neodymium can promote the formation of precipitated phases, thereby improving the corrosion resistance and thermal stability of the alloy; scandium in the aluminum-scandium master alloy can refine grains and improve tensile strength.

[0059] 2. The homogenizing annealing of the conductor in this invention can eliminate or reduce the inhomogeneity of the microstructure and improve the alloy microstructure. At the same time, precise control of the temperature and time of the aging treatment further allows the alloying elements to dissolve into the solid solution, and the supersaturated solid solution decomposes into fine precipitate phases. These precipitate phases can hinder dislocation movement, thereby significantly improving the strength and hardness of the material.

[0060] 3. The insulating layer of the present invention is modified polytetrafluoroethylene. Modified polytetrafluoroethylene is a chemical material that is resistant to high temperature, ultraviolet radiation and chemical corrosion. Therefore, the insulating layer not only has excellent electrical insulation properties, but also maintains stable physicochemical properties under extreme environments.

[0061] 4. The conductor of the present invention has a large current carrying capacity and tensile strength. In some preferred embodiments, the current carrying capacity is 3.1~3.5 A / mm². 2 The tensile strength is greater than 360 MPa. The insulating layer of this invention has good volume resistivity and elongation at break; in some preferred embodiments, the volume resistivity is greater than 3.1 × 10⁻⁶ MPa. 15 Ω·cm, elongation at break >94%. Attached Figure Description

[0062] Figure 1 This is a schematic diagram of the structure of the new energy aluminum busbar cable of the present invention. Detailed Implementation

[0063] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0064] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0065] The following are the manufacturers and product models of the raw materials used in the following examples:

[0066] The 6063 aluminum alloy was purchased from Mingtai Aluminum Industry. Its composition is 0.8%Mg, 0.45%Si, Fe≤0.12%, Cu≤0.08%, Mn≤0.064%, Cr≤0.1%, Zn≤0.1%, Ti≤0.08%, and the balance aluminum.

[0067] The magnesium-neodymium master alloy was purchased from Hunan Rare Earth Metal Materials Research Institute Co., Ltd., and its composition is 15% neodymium and the balance magnesium.

[0068] The polytetrafluoroethylene was purchased from Jiangsu Aikon, and its D50 was 25μm.

[0069] The methyl vinyl silicone rubber was purchased from Nanjing Dongjue, model number 110-2. The methyl vinyl silicone rubber is methyl-terminated, with a relative molecular weight of 400,000 to 800,000 and a vinyl content of 0.13% to 0.20%.

[0070] The lubricant was purchased from Evonik Germany, Tegomer H-Si 6441P.

[0071] The aluminum-plastic composite strip was purchased from Wuxi Suda New Material Technology Co., Ltd.

[0072] The TPE is American Gillespie 7345.

[0073] SBS is Baling Petrochemical YH-796.

[0074] PP is Basel HP741T.

[0075] The anti-aging agent is BASF antioxidant 1010.

[0076] Example 1

[0077] 1. The new energy aluminum busbar cable of this embodiment includes a cable core and a protective layer. See the structural schematic diagram of the new energy aluminum busbar cable for details. Figure 1 , Figure 1 The new energy aluminum busbar cable consists of a conductor, an insulation layer, and a protective layer from the inside out; the conductor and the insulation layer form the cable core; the conductor cross-section is a rounded rectangle, that is, the four corners of the rectangle are rounded.

[0078] The raw materials for preparing the conductor include: 100 parts of 6063 aluminum alloy, 6.5 parts of magnesium-neodymium master alloy and 2.3 parts of aluminum-scandium master alloy;

[0079] The length-to-width ratio of the conductor's cross-section is 11.0;

[0080] The insulation layer is made of modified polytetrafluoroethylene;

[0081] Modified polytetrafluoroethylene comprises the following raw materials in parts by weight: 80 parts polytetrafluoroethylene, 40 parts methyl vinyl silicone rubber, 10 parts isocyanate silane (3-isocyanate propyltrimethoxysilane), 5 parts hydrotalcite, 20 parts flame retardant (aluminum hydroxide), and 1.2 parts lubricant.

[0082] The protective layer consists of a shielding layer and a protective sleeve from the inside out.

[0083] The inner layer of the shielding layer is made of braided copper wire (braiding angle is 35±3°, braiding density is >90%), the middle layer is a permalloy powder filling layer, and the outer layer is an aluminum-plastic composite shielding tape.

[0084] The raw materials for preparing the protective case consist of 85 parts TPE, 20 parts SBS, 45 parts PP, 23 parts hydrotalcite and 0.6 parts anti-aging agent by weight.

[0085] 2. The preparation method of the new energy aluminum busbar cable in this embodiment:

[0086] Conductor preparation: The above-mentioned raw materials for conductor preparation are added to a vacuum induction furnace, evacuated, and then filled with argon protective gas. The melting temperature is controlled at 710℃, and the melting time is 6 hours. After casting and rolling, the conductor is homogenized and annealed at 555℃ for 45 minutes, then extruded and drawn into wire at a speed of 1.0 m / min, and aged at 170℃ for 6 hours. Finally, the conductor also needs to undergo surface smoothing treatment.

[0087] Preparation of modified polytetrafluoroethylene (PTFE): After cleaning and drying PTFE, isocyanate-based silane is sprayed onto its surface and reacted for 0.5 h. Then, other raw materials for preparing the modified PTFE are added, including methyl vinyl silicone rubber, hydrotalcite, flame retardant, and lubricant. The mixture is stirred at 1000 rpm for 8 min, followed by stirring at 1800 rpm for 20 min to disperse. The mixture is then placed in an internal mixer and stirred at 45 rpm and 160°C for 20 min. Next, a multi-layer extrusion process is performed to form three extruded layers of the modified PTFE. The initial temperature for multi-layer extrusion is 120°C, which is then increased to 200°C at an extrusion speed of 50 rpm. After each layer is extruded, it is water-cooled and dried at 10°C before extruding the next layer. Finally, hot vulcanization is performed at 160°C for 15 min. Benzoyl peroxide is used as the vulcanizing agent, and its concentration is 0.5% of the total mass of the methyl vinyl silicone rubber.

[0088] S1. The insulation layer is extruded onto the outside of the conductor to obtain the cable core;

[0089] S2. Wrap a shielding layer and a protective sleeve around the outside of the cable core in sequence. The outer surface of the protective sleeve has anti-slip texture. After the protective sleeve is extruded, it needs to be post-processed.

[0090] The post-processing steps are cooling, sizing, and winding, which yields the new energy aluminum busbar cable.

[0091] Example 2

[0092] The difference between this embodiment and Embodiment 1 is as follows:

[0093] The raw materials for the conductor preparation include: 100 parts of 6063 aluminum alloy, 7.8 parts of magnesium-neodymium master alloy and 3.6 parts of aluminum-scandium master alloy.

[0094] All other steps and parameters are the same as in Example 1.

[0095] Example 3

[0096] The difference between this embodiment and Embodiment 1 is as follows:

[0097] The conductor comprises the following raw materials in parts by weight: 100 parts of 6063 aluminum alloy, 3.5 parts of magnesium-neodymium master alloy and 3.8 parts of aluminum-scandium master alloy.

[0098] The length-to-width ratio of the conductor's cross-section is 13.0.

[0099] All other steps and parameters are the same as in Example 1.

[0100] Example 4

[0101] The difference between this embodiment and Embodiment 1 is as follows:

[0102] Conductor preparation: The melting temperature is controlled at 730℃ and the melting time is 5h. After casting and rolling, the conductor is homogenized and annealed at 550℃ for 50min, extruded and drawn into wire, and aged at 160℃ for 6h.

[0103] All other steps and parameters are the same as in Example 1.

[0104] Example 5

[0105] The difference between this embodiment and Embodiment 1 is as follows:

[0106] The modified polytetrafluoroethylene comprises the following raw materials in parts by weight: 80 parts polytetrafluoroethylene, 35 parts methyl vinyl silicone rubber, 7 parts isocyanate silane (3-isocyanate propyltriethoxysilane), 6 parts hydrotalcite, 15 parts flame retardant (decabromodiphenyl ether), and 1.5 parts lubricant.

[0107] All other steps and parameters are the same as in Example 1.

[0108] Example 6

[0109] The difference between this comparative example and Example 1 is as follows:

[0110] The length-to-width ratio of the conductor's cross-section is 5.0.

[0111] All other steps and parameters are the same as in Example 1.

[0112] Comparative Example 1

[0113] The difference between this comparative example and Example 1 is as follows:

[0114] The conductor comprises the following raw materials in parts by weight: 100 parts of 6063 aluminum alloy and 4 parts of aluminum-scandium master alloy.

[0115] All other steps and parameters are the same as in Example 1.

[0116] Comparative Example 2

[0117] The difference between this comparative example and Example 1 is that it contains 100 parts of 6063 aluminum alloy and 5.4 parts of magnesium-neodymium master alloy.

[0118] All other steps and parameters are the same as in Example 1.

[0119] Comparative Example 3

[0120] The difference between this comparative example and Example 1 is that it contains 100 parts of 6063 aluminum alloy, 12 parts of magnesium-neodymium master alloy, and 8 parts of aluminum-scandium master alloy.

[0121] All other steps and parameters are the same as in Example 1.

[0122] Comparative Example 4

[0123] The difference between this comparative example and Example 1 is as follows:

[0124] The modified polytetrafluoroethylene is composed of the following raw materials in parts by weight: 85 parts polytetrafluoroethylene, 45 parts methyl vinyl silicone rubber, 8 parts hydrotalcite, 18 parts flame retardant and 0.7 parts lubricant.

[0125] All other steps and parameters are the same as in Example 1.

[0126] Example of effect

[0127] The current carrying capacity and tensile strength properties of the conductors prepared in the above embodiments and comparative examples are shown in Table 1.

[0128] The current carrying capacity test method refers to GB16895.15. Under ambient temperature of 30℃ and in-air laying conditions, an increasing power frequency AC current is applied to the cable sample, and the conductor temperature is monitored until it reaches the upper limit of the long-term allowable operating temperature of the insulation material (90℃ in this project). The recorded current value at this point is the maximum safe current carrying capacity of the conductor (unit: A). To eliminate the influence of conductor cross-sectional area differences on performance comparison and to directly reflect its conductivity efficiency, the measured maximum safe current carrying capacity (A) is divided by the nominal cross-sectional area of ​​the conductor (mm²). 2 ), to obtain the current density, expressed in A / mm 2 This indicates that the higher the value, the stronger the current carrying capacity of the conductor per unit cross-sectional area and the better its conductivity.

[0129] The test method for tensile strength is in accordance with GB / T 3956.

[0130]

[0131] The volume resistivity and elongation at break properties of the insulating layers prepared in the above embodiments and comparative examples are shown in Table 2.

[0132] The volume resistivity test method for the insulation layer shall refer to GB / T 3048.5.

[0133]

[0134] Test case

[0135] The high-temperature resistance performance of the new energy aluminum busbars prepared in the above embodiments and comparative examples was tested; the test results are shown in Table 3.

[0136] High temperature resistance test:

[0137] The cable sample was placed in a high-temperature test chamber with precise temperature control. The temperature was increased from 20°C to 500°C at a rate of 10°C / min. After maintaining the temperature at 500°C for 10 hours, the physical state of the protective layer and insulation layer was observed, such as whether there was deformation, softening, cracking, etc. The current carrying capacity of the cable was checked, and the decrease in current carrying capacity should not exceed 10%.

[0138]

[0139] Based on the above results of the effect examples and test cases, we can conclude that:

[0140] The conductor in Comparative Example 1 does not contain magnesium-neodymium master alloy, so its conductivity is slightly worse; the conductor in Comparative Example 2 does not contain aluminum-scandium master alloy, so its tensile strength is lower; the conductor in Comparative Example 3 has high contents of both magnesium-neodymium master alloy and aluminum-scandium master alloy. Excessive magnesium-neodymium content will hinder grain refinement and strengthening, and excessive scandium will make the material embrittled. Furthermore, scandium forms new phases such as Al3Sc in aluminum alloys. These phases may not be evenly distributed when there is an excess, resulting in uneven material properties or local performance degradation.

[0141] The modified polytetrafluoroethylene used in the insulation layer of Comparative Example 4 does not contain isocyanate-based silanes in its raw materials. As shown in Table 3, the insulation layer cracked in many places after the high temperature resistance test.

[0142] Unless otherwise specified, all raw materials, reagents, instruments, and equipment used in this invention can be purchased commercially or prepared using existing methods. The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this invention. It should be understood that the above descriptions are merely specific embodiments of this invention and are not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A new energy aluminum busbar cable, characterized in that, Including the cable core and protective layer; The cable core includes a conductor and an insulation layer; The raw materials for preparing the conductor include: 100 parts of 6063 aluminum alloy, 2-10 parts of magnesium-neodymium master alloy, and 0.5-6 parts of aluminum-scandium master alloy. The insulating layer is made of modified polytetrafluoroethylene, which comprises the following raw materials in parts by weight: 60-95 parts polytetrafluoroethylene, 30-70 parts methyl vinyl silicone rubber, 5-17 parts isocyanate silane, 2-8 parts hydrotalcite, 5-30 parts flame retardant and 0.5-2 parts lubricant. The isocyanate-based silane is 3-isocyanate-propyltrimethoxysilane or 3-isocyanate-propyltriethoxysilane.

2. The new energy aluminum busbar cable as described in claim 1, characterized in that, The neodymium content in the magnesium-neodymium master alloy is 10-16%; The scandium content in the aluminum-scandium master alloy is 2-10%; The 6063 aluminum alloy comprises the following elements by mass percentage: 0.45~0.95%Mg, 0.2~0.6%Si, Fe≤0.3%, Cu≤0.1%, Mn≤0.1%, Cr≤0.1%, Zn≤0.1%, and Ti≤0.1%.

3. The new energy aluminum busbar cable as described in claim 1, characterized in that, The aspect ratio of the conductor is ≥9.

0.

4. The new energy aluminum busbar cable as described in claim 1, characterized in that, The D50 of the polytetrafluoroethylene is 25~35μm; The vinyl content of the methyl vinyl silicone rubber is 0.13~0.20%; The methyl vinyl silicone rubber is methyl-terminated; The relative molecular weight of the methyl vinyl silicone rubber is 400,000 to 800,000; The flame retardant is aluminum hydroxide or decabromodiphenyl ether.

5. The new energy aluminum busbar cable as described in claim 1, characterized in that, The current carrying density of the conductor is 3.1~3.5 A / mm². 2 ; The tensile strength of the conductor is 362~374 MPa; The elongation at break of the insulating layer is >90%; The volume resistivity of the insulating layer is >3×10⁻⁶. 15 Ω·cm.

6. The new energy aluminum busbar cable as described in claim 1, characterized in that, The protective layer, from the inside out, includes a shielding layer and a protective sleeve; The shielding layer consists of an inner layer of braided copper wire, a middle layer of permalloy powder filling, and an outer layer of aluminum-plastic composite shielding tape. The protective sleeve is made from TPE, SBS and PP.

7. The method for preparing new energy aluminum busbar cables according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. The insulation layer is extruded onto the outside of the conductor to obtain the cable core; S2. A shielding layer and a protective sleeve are wrapped around the outside of the cable core in sequence to obtain a new energy aluminum busbar cable.

8. The method for preparing the new energy aluminum busbar cable as described in claim 7, characterized in that, The method for preparing the conductor includes the following steps: melting, casting and rolling the raw materials for preparing the conductor, homogenizing and annealing, extruding and drawing the wire, and aging treatment. The modified polytetrafluoroethylene includes the following steps: mixing and dispersing the raw materials for preparing the modified polytetrafluoroethylene, internal mixing, extrusion molding, rapid cooling and hot vulcanization.

9. The method for preparing the new energy aluminum busbar cable as described in claim 8, characterized in that, The melting temperature is 700~730℃ and the time is 4~8h; The melting was carried out under argon protection; The homogenization annealing temperature is 550~560℃ and the time is 0.5~1h; The aging treatment is performed at a temperature of 160-170℃ for 6-7 hours. The extrusion drawing speed is 1.0~2.0m / min.

10. The method for preparing the new energy aluminum busbar cable as described in claim 8, characterized in that, The polytetrafluoroethylene (PTFE) also needs to undergo pretreatment. The pretreatment steps are to treat the PTFE surface and then spray an isocyanate-based silane solution onto the PTFE surface and react for 0.5 to 1 hour. The mixing and dispersion process involves stirring at 500-2000 rpm for 5-10 minutes and then stirring at 1000-2000 rpm for 15-30 minutes. The mixing temperature is 150~180℃, the mixing speed is 30~60rpm, and the mixing time is 15~30min; The extrusion molding process is a multi-layer extrusion process; The initial temperature of the extrusion molding is 100~150℃, and the final temperature is 180~220℃; The extrusion speed of the extrusion molding is 20~60 rpm; The rapid cooling method is water cooling, and the temperature of the cooling water is controlled at 5~15℃. The temperature for the thermal vulcanization is 150~180℃ and the time is 10~30min.

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