A high-efficiency heat dissipation fast charging pile cable

Abstract

The invention provides a high-efficiency heat dissipation fast charging pile cable, which relates to the technical field of cable production. The high-efficiency heat dissipation fast charging pile cable comprises a MXene / Wacker SilGel 612 aluminum alloy strip, and a preparation method comprises: adding Wacker SilGel 612 and MXene to deionized water, stirring after ultrasonication to obtain a mixture, and then immersing the aluminum alloy in the mixture, transferring it to a refrigerated shaker, and shaking it; and involves the preparation steps of the high-efficiency heat dissipation fast charging pile cable and the calculation of the overlap rate of the semi-conductive nylon strip wrapped around the outside of the conductor.

Description

Technical Field

[0001] The present invention relates to the technical field of power cable production, and in particular to a high-efficiency heat dissipation type fast charging pile cable. Background Art

[0002] Power cables are cables used to transmit and distribute electrical energy. They are commonly used in urban underground power grids, power station lead-out lines, internal power supply for industrial and mining enterprises, and underwater transmission lines across rivers and seas. The conductor of power cables is generally composed of twisted copper single wires, which bear the core function of carrying current. Power cables usually use aluminum alloy as conductors, but the creep resistance of aluminum alloy is weak, and the heat dissipation capacity and fast charging capacity cannot meet the demand for efficient heat dissipation fast charging piles on the market. The normal operating temperature range of charging piles is generally between -30℃ and 50℃. In extremely low or high temperature environments, additional warming or heat dissipation measures may be required. For example, in low temperature environments, the charging pile may need to be heated to ensure that its internal components are not frozen; in high temperature environments, heat dissipation needs to be strengthened to prevent the internal temperature from being too high and causing damage to the components. During the charging process, the internal working temperature of the charging pile will be affected by many factors such as charging power, charging time, and external ambient temperature. Especially when the charging pile is in high-power fast charging mode, the internal temperature may rise rapidly, and existing technologies and R&D personnel often ignore the changes brought about by the actual use environment temperature to the material, such as changes in the coefficient of thermal expansion, conductivity value and density, so the overlap rate used in the prescribed use or design scheme has a large error with the actual situation, which is not conducive to the development of an efficient heat dissipation fast charging pile cable in line with the actual situation. Based on the above situation, the R&D personnel have developed an efficient heat dissipation fast charging pile cable. By modifying the aluminum alloy and combining the multiple stages involved in the creep behavior of the aluminum alloy, including the deceleration creep stage (first stage) and the stable creep stage (second stage), the creep resistance of the aluminum alloy is improved in multiple dimensions, while meeting the market's demand for heat dissipation and fast charging of efficient heat dissipation fast charging piles. In addition, a calculation method for the overlap rate is designed, which fully considers the impact of temperature changes on the material in the actual charging environment, so as to achieve an overlap rate that is more in line with the actual situation, which is more conducive to the design of an efficient heat dissipation fast charging pile cable. Summary of the invention

[0003] The present invention provides a high-efficiency heat dissipation type fast charging pile cable to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention discloses a high-efficiency heat dissipation type fast charging pile cable, and the high-efficiency heat dissipation type fast charging pile cable includes a MXene / Wacker SilGel 612 aluminum alloy strip.

[0005] Furthermore, the raw materials for preparing the MXene / Wacker SilGel 612 aluminum alloy strip include: WackerSilGel 612, MXene and aluminum alloy.

[0006] Furthermore, the preparation method of the MXene / Wacker SilGel 612 aluminum alloy strip includes: adding WackerSilGel 612 and MXene to deionized water, stirring after ultrasonication to obtain a mixture, then immersing the aluminum alloy in the mixture, transferring it to a refrigerated shaker, and shaking it to allow the MXene and Wacker SilGel 612 to adhere to the surface of the aluminum alloy to obtain a MXene / Wacker SilGel 612 aluminum alloy strip.

[0007] Further, based on weight, 2-3 parts of Wacker SilGel 612 and 4-6 parts of MXene were added to 80-120 parts of deionized water.

[0008] Furthermore, the preparation method of MXene includes: adding HCl and LiF and stirring at 35°C for 5 minutes, and then adding Ti 3 AlC 2 Add, stir at 35 ° C for 24 hours, collect the precipitate to obtain MXene; preferably, by weight, 30-40 parts of HCl and 1-3 parts of LiF, add 1-2 parts of Ti 3 AlC 2 .

[0009] Furthermore, the oscillation speed is 175-200 rpm, and the oscillation time is 4-5 h; preferably, the ultrasonic time is 30-40 minutes, and the stirring time is 20-50 minutes.

[0010] Furthermore, the steps for preparing a high-efficiency heat dissipation fast charging pile cable are as follows:

[0011] S1, wrapping the semi-conductive nylon tape around the outside of the MXene / Wacker SilGel 612 aluminum alloy tape to obtain the inner shielding layer of the conductor;

[0012] S2, wrap the semi-conductive nylon tape around the outside of the insulating shielding layer;

[0013] S3, forming an inner conductor by a three-layer co-extrusion method using the conductor inner shielding layer, the insulating shielding layer and the insulating layer obtained in steps S1 and S2;

[0014] S4, using flame-retardant parallel stranded PP filling rope to make the inner conductor obtained in step S3 into a cable core, with an out-of-roundness β=6%, and the outer side of the cable core is wrapped with a phosphor copper wire braided mesh;

[0015] S5. Wrap the copper wire shielding layer, aluminum tape interlocking armor and cross-linked polyolefin outer sheath in sequence around the outside of the cable core obtained in step S4 to obtain the efficient heat dissipation type fast charging pile cable.

[0016] Furthermore, the overlap ratio of the semi-conductive nylon tape wrapped around the outside of the conductor is m1.

[0017] Furthermore, the overlap rate a is the compression coefficient of aluminum alloy; S1 and S2 are the tensile strength of aluminum alloy profile and copper wire, respectively, in MPa; β is the thermal expansion coefficient of aluminum alloy, in 10 -6 / ℃; T is the current temperature, T 0 is the reference temperature, usually the ambient temperature under standard conditions, in °C; h1 is the thickness of the conductor inner shielding layer, h2 is the thickness of the insulating shielding layer, in mm; ρ is the density of the aluminum alloy at the current temperature, ρ 0 is the standard density of aluminum alloy, in kg / m 3 ; σ is the conductivity of aluminum alloy at the current temperature, σ 0 It is the standard conductivity value of aluminum alloy, and its unit is S / m.

[0018] Furthermore, h1 represents the thickness of the inner shielding layer of the conductor is 1.0-1.2 mm, and the thickness of the insulating shielding layer is 1.0-1.2 mm.

[0019] Compared with the prior art, the present invention provides a high-efficiency heat dissipation type fast charging pile cable, which has the following beneficial effects:

[0020] 1. MXene is a new type of two-dimensional material with excellent electrical conductivity, thermal conductivity and thermal stability. Due to its unique layered structure, MXene can significantly improve the mechanical properties and thermal stability of the matrix in composite materials. The nano-layered structure of MXene may help to form an effective stress transfer network in the aluminum alloy strip, improve the overall mechanical properties and creep resistance, and provide excellent physical structural support for aluminum alloys in the deceleration creep stage (first stage);

[0021] 2. Wacker SilGel 612 is a two-component, addition-curable silicone gel with the characteristics of low viscosity, fast curing, low hardness, excellent moisture resistance and good damping performance. This silicone gel can harden into a transparent gel without plasticizer at room temperature. It is particularly suitable for applications that require good flexibility and sealing. It has good creep resistance and can maintain shape and size stability under long-term stress, which is conducive to the stability of aluminum alloy in the stable creep stage (second stage) and maintain it at a lower level;

[0022] 3. The compound of Wacker SilGel 612 and MXene plays a positive role in the multi-stage creep of aluminum alloys. Under the appropriate formula ratio of this application, the interface bonding strength between MXene, Wacker SilGel 612 and aluminum alloy is excellent, which can ensure that there is no relative slip or debonding between the components of the composite material when it is subjected to stress, thereby maintaining the stability of the overall shape;

[0023] 4. The conductor is wrapped with semi-conductive nylon tape, with a coverage rate of By accounting for changes in temperature, density, and conductivity, the formula more accurately reflects the actual performance of cable conductors under different environments and operating conditions. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described below. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0025] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] Unless otherwise specified, the examples and comparative examples are parallel tests with the same components, component contents, preparation steps and preparation parameters. The experimental methods in the following examples are conventional methods unless otherwise specified. The experimental materials used in the following examples are analytical reagents (AR) unless otherwise specified, which are purchased from commercial channels.

[0027] MAX phase ceramic powder was purchased from Sinopharm Shanghai Reagent Co., Ltd.; aluminum alloy belt was made of 5052 aluminum alloy; copper wire: Lu'an Hongtai New Copper Material Technology Yixing Co., Ltd., copper content ≥99.96, twisting ≥30 times; copper belt: Yixing Jiashidai Electrical Materials Co., Ltd., tensile strength ≥250Mpa; semi-conductive nylon belt: tensile strength ≥150N / mm 2; Flame retardant A-grade low-smoke halogen-free polyolefin sheath material: Jiangsu Yifan Polymer Materials Co., Ltd., flame retardant, oxygen index greater than ≥36, tensile strength of sheath before aging ≥12.0Mpa; Steel belt: Renqiu Baihui Steel Belt Co., Ltd., tensile strength ≥450N / mm 2 ; Phosphor bronze wire woven mesh: Anping County Aodeyuan Metal Products Co., Ltd., 400 mesh, aperture 0.08mm, wire diameter 0.05mm; Flame retardant parallel stranded PP filling rope: Wuxi Henglong Cable Material Co., Ltd., flame retardant, oxygen index greater than ≥36.

[0028] Example 1

[0029] Preparation of multilayer MXene: 30 parts of HCl and 2 parts of LiF were added and stirred at 35 °C for 5 minutes, and then 2 parts of Ti 3 AlC 2 Add, stir at 35 °C for 24 h, and collect the precipitate to obtain MXene.

[0030] Preparation of MXene / Wacker SilGel 612 aluminum alloy ribbon:

[0031] Three parts of Wacker SilGel 612 and five parts of MXene were added to 100 parts of deionized water, ultrasonicated for 30 minutes and then stirred for 30 minutes to obtain a mixture. Then, a 15-cm-long aluminum alloy strip was immersed in the mixture, transferred to a refrigerated shaker, and shaken at 175 rpm for 5 hours to allow MXene and Wacker SilGel 612 to adhere to the surface of the aluminum alloy to obtain a MXene / Wacker SilGel 612 aluminum alloy strip.

[0032] Example 2

[0033] Preparation of multilayer MXene: 40 parts of HCl and 1 part of LiF were added and stirred at 35 °C for 5 minutes, and then 1 part of Ti 3 AlC 2 Add, stir at 35 °C for 24 h, and collect the precipitate to obtain MXene.

[0034] Preparation of MXene / Wacker SilGel 612 aluminum alloy ribbon:

[0035] 2.5 parts of Wacker SilGel 612 and 4 parts of MXene were added to 100 parts of deionized water, ultrasonicated for 30 minutes and then stirred for 30 minutes to obtain a mixture. Then, a 15 cm long aluminum alloy was immersed in the mixture, transferred to a refrigerated shaker, and shaken at 175 rpm for 5 hours to allow MXene and Wacker SilGel 612 to adhere to the surface of the aluminum alloy to obtain a MXene / Wacker SilGel 612 aluminum alloy strip.

[0036] Example 3

[0037] Preparation of multilayer MXene: 40 parts of HCl and 3 parts of LiF were added and stirred at 35 °C for 5 minutes, and then 2 parts of Ti 3 AlC 2 Add, stir at 35 °C for 24 h, and collect the precipitate to obtain MXene.

[0038] Preparation of MXene / Wacker SilGel 612 aluminum alloy ribbon:

[0039] 2 parts of Wacker SilGel 612 and 6 parts of MXene were added to 100 parts of deionized water, ultrasonicated for 30 minutes and then stirred for 30 minutes to obtain a mixture. Then, a 15 cm long aluminum alloy was immersed in the mixture, transferred to a refrigerated shaker, and shaken at 175 rpm for 5 hours to allow MXene and Wacker SilGel 612 to adhere to the surface of the aluminum alloy to obtain a MXene / Wacker SilGel 612 aluminum alloy strip.

[0040] Comparative Example 1

[0041] The difference from Example 1 is that an equal weight portion of MXene is missing, and a Wacker SilGel 612 aluminum alloy strip is prepared, and the rest is the same.

[0042] Comparative Example 2

[0043] The difference from Example 1 is that an equal weight portion of Wacker SilGel 612 is missing, and a MXene aluminum alloy strip is prepared, and the rest is the same.

[0044] The MXene / Wacker SilGel 612 aluminum alloy strips prepared in the examples and comparative examples are used to prepare high-efficiency heat dissipation type fast charging pile cables. The steps for preparing high-efficiency heat dissipation type fast charging pile cables are as follows:

[0045] S1, wrapping the semi-conductive nylon tape around the outside of the MXene / Wacker SilGel 612 aluminum alloy tape to obtain the inner shielding layer of the conductor;

[0046] S2, wrap the semi-conductive nylon tape around the outside of the insulating shielding layer;

[0047] S3, forming an inner conductor by a three-layer co-extrusion method using the conductor inner shielding layer, the insulating shielding layer and the insulating layer obtained in steps S1 and S2;

[0048] S4, using flame-retardant parallel stranded PP filling rope to make the inner conductor obtained in step S3 into a cable core, with an out-of-roundness β=6%, and the outer side of the cable core is wrapped with a phosphor copper wire braided mesh;

[0049] S5. The copper wire shielding layer, the aluminum tape interlocking armor and the cross-linked polyolefin outer sheath are sequentially wrapped around the outside of the cable core obtained in step S4 to obtain a high-efficiency heat dissipation type fast charging pile cable.

[0050] The conductor is wrapped with semi-conductive nylon tape, and the coverage rate is a is the compression coefficient of aluminum alloy, ranging from 0.85 to 0.95; S1 and S2 are the tensile strength of aluminum alloy profile and copper wire, respectively, in MPa; β is the thermal expansion coefficient of aluminum alloy, in 10 -6 / ℃; T is the current temperature, T 0 is the reference temperature, usually the ambient temperature under standard conditions, in °C; h1 is the thickness of the conductor inner shielding layer, h2 is the thickness of the insulating shielding layer, in mm; ρ is the density of the aluminum alloy at the current temperature, ρ 0 is the standard density of aluminum alloy, in kg / m 3 ; σ is the conductivity of aluminum alloy at the current temperature, σ 0 It is the standard conductivity value of aluminum alloy, and its unit is S / m.

[0051] ρ / ρ 0 It reflects the influence of density change of materials under actual conditions on overlap rate. Density change will affect the quality and thermal conductivity of materials; σ / σ 0 It reflects the influence of the conductivity change of the material under different conditions on the overlap rate. The change of conductivity will directly affect the conductive performance and thermal effect of the cable. By introducing the changes of temperature, density and conductivity, the formula more accurately reflects the actual performance of the cable conductor under different environments and working conditions.

[0052] Performance Testing

[0053] The aluminum alloy strips prepared in the examples and comparative examples were subjected to mechanical property tests, power plant uniformity tests, and thermal conductivity tests. The results are shown in Table 1.

[0054] Table 1

[0055]

[0056]

[0057] As can be seen from Table 1, Example 1 has the best tensile strength, conductivity value and thermal conductivity. The conductivity of a cable refers to the ability of a cable material to conduct current, which reflects the efficiency of the cable in transmitting electrical energy. The higher the conductivity, the less resistance the material has to the current, and the less resistance the current encounters when passing through.

[0058] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. If these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A high-efficiency heat dissipation fast charging pile cable, characterized in that: The high-efficiency heat dissipation fast charging pile cable includes a MXene / Wacker SilGel 612 aluminum alloy strip; the raw materials for preparing the MXene / Wacker SilGel 612 aluminum alloy strip include: Wacker SilGel 612, MXene and aluminum alloy; the preparation method of the MXene / Wacker SilGel 612 aluminum alloy strip includes: adding Wacker SilGel 612 and MXene to deionized water, stirring after ultrasonication to obtain a mixture, and then immersing the aluminum alloy in the mixture, transferring it to a refrigerated shaker, and shaking it to make the MXene and Wacker SilGel612 adhere to the surface of the aluminum alloy to obtain the MXene / Wacker SilGel 612 aluminum alloy strip.

2. The high-efficiency heat dissipation fast charging pile cable according to claim 1, characterized in that: According to weight, 2-3 parts of Wacker SilGel 612 and 4-6 parts of MXene were added to 80-120 parts of deionized water.

3. The high-efficiency heat dissipation fast charging pile cable according to claim 1, characterized in that: The preparation method of the MXene comprises: adding HCl and LiF and stirring at 35° C. for 5 minutes, then adding Ti3AlC2, stirring at 35° C. for 24 hours, and collecting the precipitate to obtain MXene; by weight, 30-40 parts of HCl and 1-3 parts of LiF, and 1-2 parts of Ti3AlC2 are added.

4. The high-efficiency heat dissipation fast charging pile cable according to claim 1, characterized in that: The shaking speed is 175-200 rpm, and the shaking time is 4-5 hours; the ultrasonic time is 30-40 minutes, and the stirring time is 20-50 minutes.

5. The high-efficiency heat dissipation fast charging pile cable according to claim 1, characterized in that: The steps for preparing high-efficiency heat dissipation fast charging pile cables are as follows: S1, wrapping the semi-conductive nylon tape around the outside of the MXene / Wacker SilGel 612 aluminum alloy tape to obtain the inner shielding layer of the conductor; S2, wrap the semi-conductive nylon tape around the outside of the insulating shielding layer; S3, forming an inner conductor by a three-layer co-extrusion method using the conductor inner shielding layer, the insulating shielding layer and the insulating layer obtained in steps S1 and S2; S4, using flame-retardant parallel stranded PP filling rope to make the inner conductor obtained in step S3 into a cable core, with an out-of-roundness β=6%, and the outer side of the cable core is wrapped with a phosphor copper wire braided mesh; S5. Wrap the copper wire shielding layer, aluminum tape interlocking armor and cross-linked polyolefin outer sheath in sequence around the outside of the cable core obtained in step S4 to obtain the efficient heat dissipation type fast charging pile cable.

6. The high-efficiency heat dissipation fast charging pile cable according to claim 5, characterized in that: The overlap rate of the semi-conductive nylon tape wrapped around the conductor is m1, m1 = (1-a· (1+β(T-T0)) · · , a is the compression coefficient of aluminum alloy; S1 and S2 are the tensile strength of aluminum alloy profile and copper wire, respectively, in MPa; β is the thermal expansion coefficient of aluminum alloy, in 10 -6 / °C; T is the current temperature, T0 is the reference temperature, which is the ambient temperature under standard conditions, in °C; h1 is the thickness of the inner shielding layer of the conductor, h2 is the thickness of the insulating shielding layer, in mm; ρ is the density of the aluminum alloy at the current temperature, ρ0 is the standard density of the aluminum alloy, in kg / m³; σ is the conductivity of the aluminum alloy at the current temperature, σ0 is the standard conductivity value of the aluminum alloy, in S / m.

7. The high-efficiency heat dissipation fast charging pile cable according to claim 6, characterized in that: The h1 represents the thickness of the inner shielding layer of the conductor, which is 1.0-1.2 mm, and the thickness of the insulating shielding layer is 1.0-1.2 mm.

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