Oil-cooled high-power liquid-cooled charging pile cable and preparation process

Abstract

The invention relates to the technical field of new energy automobile charging cables, and discloses an oil-cooled high-power liquid-cooled charging pile cable and a preparation process thereof, and the oil-cooled high-power liquid-cooled charging pile cable comprises a first main core cable, a second main core cable, a thermal insulation layer wrapping the peripheries of the first main core cable and the second main core cable, and a sheath layer wrapping the thermal insulation layer. A liquid cooling oil outlet pipe is arranged in the center of the first main core cable, a conductor wraps the outer side of the liquid cooling oil outlet pipe, an insulating layer wraps the outer side of the conductor, a liquid cooling oil supply pipe is arranged below the outside of the first main core cable, and the liquid cooling oil supply pipe and the liquid cooling oil outlet pipe form a closed loop. A filling layer is arranged outside the liquid cooling oil supply pipe and the first main core cable, and the liquid cooling oil outlet pipe is used for cooling the conductor. According to the oil-cooled high-power liquid-cooled charging pile cable, the overall heat dissipation effect is better and stable, the corresponding weight is light, and the experience of a charging user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle charging cables, and in particular to an oil-cooled high-power liquid-cooled charging pile cable and a preparation process thereof. Background Art

[0002] With the rapid development of the new energy vehicle industry, various new energy vehicles with long battery life have been launched, bringing green, low-cost and efficient travel experience to people. In order to further improve the use experience of new energy vehicles, major manufacturers have developed various types of fast charging piles. In order to solve the heat dissipation and weight problems of charging pile cables, liquid-cooled charging pile cables have been introduced. On the one hand, it improves the heat dissipation problem in the previous fast charging process. On the other hand, the diameter of the liquid-cooled charging pile cable itself is not large, which is convenient for users to pick up and put when using the charging pile, improving convenience.

[0003] At present, most of the direct liquid-cooled charging pile cables for new energy vehicles on the market are water-cooled charging pile cables. The structure adopts a structure in which the main core line is split into multiple cables and two liquid cooling tubes are added. This cable liquid cooling method uses two liquid cooling tubes to contact the split power line cables to conduct heat. Through the cooling method of circulating coolant (50% ethylene glycol + 50% water), the heat generated by the conductor needs to be dissipated through the coolant through the two media of insulation material and liquid cooling pipe. Since the liquid cooling pipe is generally made of nylon and silicone, and the insulation material is cross-linked polyolefin, these polymer materials have low thermal conductivity, so the heat generated by the conductor cannot be cooled in time when a large current passes through, resulting in an increase in the temperature inside and on the surface of the cable. The cable is used at high temperatures for a long time, and even the coolant leaks due to the liquid cooling pipe itself, and the cooling fails, there is a safety hazard of overheating and causing fire.

[0004] Therefore, it is necessary to provide an oil-cooled high-power liquid-cooled charging pile cable and a preparation process to solve the above problems, improve its heat dissipation performance, and at the same time increase the life of the cable itself. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an oil-cooled high-power liquid-cooled charging pile cable and a preparation process.

[0006] In order to achieve the above-mentioned objectives, the present invention adopts the following technical solutions: an oil-cooled high-power liquid-cooled charging pile cable, characterized in that it includes a first main core cable and a second main core cable, an insulation layer wrapped on the outer periphery of the first main core cable and the second main core cable, and a sheath layer wrapped on the outside of the insulation layer, a liquid-cooled oil outlet pipe is arranged at the center of the first main core cable, a conductor is wrapped on the outside of the liquid-cooled oil outlet pipe, an insulation layer is wrapped on the outside of the conductor, a liquid-cooled oil supply pipe is arranged at the lower part of the outside of the first main core cable, the liquid-cooled oil supply pipe and the liquid-cooled oil outlet pipe form a closed loop, a filling layer is arranged on the liquid-cooled oil supply pipe and the outside of the first main core cable, and the liquid-cooled oil outlet pipe is used to dissipate heat from the conductor.

[0007] As a preferred technical solution of the present invention, a first signal cable and a second signal cable are arranged on the upper part of the first main core cable, an aluminum foil layer is arranged on the outside of the first signal cable, the inner side of the aluminum foil layer is wrapped with a braided shielding layer, and a plurality of signal cables are arranged inside the braided shielding layer.

[0008] As a preferred technical solution of the present invention, the braided shielding layer is composed of 24 copper wires with a diameter of 0.12 mm, 8 of which are twisted into one strand and intertwined to cover the outside of the signal cable, thereby shielding and protecting the outside of the signal cable, and preventing other electromagnetic wave signals from the outside from affecting the normal signal transmission of the signal cable inside the braided shielding layer.

[0009] As a preferred technical solution of the present invention, the conductor is composed of a plurality of copper wire bundles, a metal bellows is provided at the center of the conductor, the plurality of copper wires are tightly fitted around the metal bellows by twisting, and the liquid-cooled oil outlet pipe and the liquid-cooled oil supply pipe are filled with coolant, and the types of coolant include dimethyl silicone oil.

[0010] As a preferred technical solution of the present invention, a first auxiliary power cable and a second auxiliary power cable are respectively arranged on the left and right sides of the liquid-cooled oil supply pipe, and a grounding cable is arranged at the lower side of the second auxiliary power cable.

[0011] As a preferred technical solution of the present invention, the liquid-cooled oil supply pipe and the insulating layer are both made of cross-linked polyolefin material, which can be one of cross-linked polyethylene and cross-linked polypropylene.

[0012] As a preferred technical solution of the present invention, an oil outlet pipe outer body is arranged on the outside of the liquid-cooled oil outlet pipe, and the oil outlet pipe outer body surrounds and abuts against the outside of the liquid-cooled oil outlet pipe. The oil outlet pipe outer body is used to protect the stability of the inside of the liquid-cooled oil outlet pipe. The liquid-cooled oil outlet pipe can be made of one of stainless steel or copper materials.

[0013] As a preferred technical solution of the present invention, the contact surface of the sheath layer wrapped on the heat insulation layer is provided with an irregularly shaped anti-slip strip.

[0014] The present invention also provides a process for preparing an oil-cooled high-power liquid-cooled charging pile cable, comprising the following steps:

[0015] Step 1: Conductor (302) processing procedure, using a 1+6+12+18 type 630 cage stranding machine, 35 square millimeters of conductor are divided into 14 reels of 81 / 0.2MM bundled wire strands, placed on 18 reels, a metal bellows is set in the center of the conductor, and the 14 reels of 81 / 0.2MM bundled wire strands are twisted on the metal bellows, and the conductor compression coefficient is greater than or equal to 75%;

[0016] Step 2: Insulation layer extrusion process, a plastic extruder is used to extrude the cross-linked polyolefin material. The upper limit of the use environment condition is 150°. During the extrusion process, insulation treatment is used throughout the process. The insulation layer is tightly wrapped around the conductor. The extrusion die is quickly cooled and cooled to form.

[0017] Step 3: Insulation layer irradiation process, using physical electron irradiation technology, specifically including the following steps: first, cleaning and drying the cable material; second, placing the cable material in an irradiation room and irradiating it with electron beam or gamma ray; the irradiation dose and irradiation time are adjusted accordingly according to the cable material specifications and manufacturing technical requirements; the irradiated cable material is cooled and allowed to stand and annealed accordingly to eliminate the influence of various stresses during the irradiation process; and the cable material is systematically tested for technical performance indicators to ensure that the irradiated cable material as a whole meets the design calibration technical indicators; through the irradiation cross-linking reaction, the carbonization of the polymer is improved, and the flame retardancy and temperature resistance are improved;

[0018] Step 4: Liquid-cooled oil supply pipe extrusion process, using 150° cross-linked polyolefin material to extrude using an extruder. During the extrusion operation, the entire process uses a vacuum tube extrusion process to make the inner and outer wall surfaces of the tube smooth, the inner and outer diameters are in a stable state, and the die outlet is quickly cooled;

[0019] Step 5: cabling process, the first main core cable and the second main core cable, the first signal cable and the second signal cable, the ground cable, the liquid cooling oil supply pipe, the first auxiliary power cable (9) and the second auxiliary power cable are assembled on a 1250 cabling machine, and each core wire is subjected to a detwisting process to release the stress between the cores and increase the service life of the cable;

[0020] Step 6: Sheath layer extrusion process. The sheath layer is made of polyether thermoplastic polyurethane material. The polyether thermoplastic polyurethane is put into a 120 extruder to allow the polyether thermoplastic polyurethane to tightly wrap the cable core wire. The corresponding die outlet is quickly cooled and formed.

[0021] As a preferred technical solution of the present invention, the detwisting process comprises the following steps:

[0022] Step 1: Inspection process, check whether the cable as a whole is obviously twisted or damaged. This process can be inspected manually and with a CCD visual camera system;

[0023] Step 2: Pre-supporting process, fix the cable on a plane, apply appropriate tension to the cable as a whole, and pre-support it so that the stress inside the cable is released and stretched appropriately;

[0024] Step three: back-twisting, fixing the cable as a whole and reverse twisting the cable. The back-twisting direction is opposite to the twisting direction during the cabling process. The reverse twisting eliminates the original twist in the cable.

[0025] Step 4: Baking: Baking the cable after untwisting to ensure that the residual moisture inside the cable is removed and the insulation of the cable is ensured;

[0026] Step 5: Measurement and inspection: After the back-twist process is completed, make necessary measurements and inspections on the cable to ensure that the back-twist meets the requirements;

[0027] Step six: Combine and package the cables.

[0028] The present invention has the following beneficial effects: 1. An oil-cooled high-power liquid-cooled charging pile cable provided by the present invention, first of all, by setting a metal liquid-cooled oil outlet pipe, the oil outlet pipe outer body outside the liquid-cooled oil outlet pipe itself forms a buffer and protection for the internal liquid-cooled oil outlet pipe. The metal liquid-cooled oil outlet pipe has significantly improved heat resistance and expansion resistance compared to conventional nylon and silicone liquid-cooling pipes. At the same time, the coolant will not affect the pressure resistance of the liquid-cooled oil outlet pipe under different working conditions, causing leakage and cooling failure.

[0029] 2. The liquid-cooled oil supply pipe and the liquid-cooled oil outlet pipe adopt a split closed loop. The liquid circulation efficiency inside the liquid-cooled oil outlet pipe is higher and the flow of coolant is smoother. At the same time, the use of new process technology allows the conductor itself to bend and stretch in a small bending radius, improving the flexibility of the cable itself, reducing friction and impact between adjacent wires and cables inside the cable, and further improving the service life of the entire charging cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall cross-sectional structure of an oil-cooled high-power liquid-cooled charging pile cable proposed by the present invention;

[0031] Figure 2 for Figure 1 Schematic diagram of the overall structure of the liquid cooling oil outlet pipe;

[0032] In the figure: 1-sheath layer; 2-insulation layer; 3-first main core cable; 301-liquid cooling oil outlet pipe; 3011-outer body of oil outlet pipe; 302-conductor; 303-insulation layer; 4-second main core cable; 5-first signal cable; 501-aluminum foil layer; 502-braided shielding layer; 6-second signal cable; 7-filling layer; 8-liquid cooling oil supply pipe; 9-first auxiliary power cable; 10-second auxiliary power cable; 11-grounding cable; DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] according to Figure 1 and Figure 2 As shown, an oil-cooled high-power liquid-cooled charging pile cable is characterized in that it includes a first main core cable 3 and a second main core cable 4, an insulation layer 2 wrapped on the outer periphery of the first main core cable 3 and the second main core cable 4, and a sheath layer 1 wrapped on the outside of the insulation layer 2, a liquid-cooled oil outlet pipe 301 is arranged at the center of the first main core cable 3, a conductor 302 is wrapped on the outside of the liquid-cooled oil outlet pipe 301, and an insulating layer 303 is wrapped on the outside of the conductor 302, a liquid-cooled oil supply pipe 8 is arranged at the lower part of the outside of the first main core cable 3, the liquid-cooled oil supply pipe 8 and the liquid-cooled oil outlet pipe 301 form a closed loop, a filling layer 7 is arranged on the outside of the liquid-cooled oil supply pipe 8 and the first main core cable 3, and the overall material of the filling layer 7 adopts a mesh structure made of high-strength polypropylene fiber, has good mechanical properties and chemical stability, and is itself a lightweight material. As a filling layer 7, it can significantly reduce the overall weight of the cable and meet various usage demand indicators.

[0035] The liquid cooling oil outlet pipe 301 is used to dissipate heat for the conductor 302. The first signal cable 5 and the second signal cable 6 are arranged on the upper part of the first main core cable 3. The first signal cable 6 is provided with an aluminum foil layer 501 on the outside. The inner side of the aluminum foil layer 501 is wrapped around the braided shielding layer 502. A plurality of signal cables are arranged inside the braided shielding layer 502. The braided shielding layer 502 is composed of 24 copper wires with a diameter of 0.12 mm, 8 of which are twisted into one strand, intertwined and covered on the outside of the signal cable, shielding and protecting the outside of the signal cable, and preventing other electromagnetic wave signals from the outside from affecting the normal signal transmission of the signal cable inside the braided shielding layer 502.

[0036] The conductor 302 is composed of a plurality of copper wire bundles, a metal bellows is provided at the center of the conductor 302, and the plurality of copper wires are tightly attached to the metal bellows by twisting, and the liquid cooling oil outlet pipe 301 and the liquid cooling oil supply pipe 8 are filled with coolant, and the coolant includes dimethyl silicone oil. In actual use, it is found that dimethyl silicone oil is used as a daily coolant, and compared with ethylene glycol aqueous solution, it has better high temperature stability, and at the same time, it has better lubricity, and its own flow resistance is smaller during the flow inside the container. Therefore, when used as a coolant, it has a longer replacement cycle under the same environmental use load conditions.

[0037] A first auxiliary power cable 9 and a second auxiliary power cable 10 are respectively arranged on the left and right sides of the liquid cooling oil supply pipe 8 , and a grounding cable 11 is arranged at the lower side of the second auxiliary power cable 10 .

[0038] The liquid cooling oil supply pipe 8 and the insulating layer 303 are both made of cross-linked polyolefin material, which can be one of cross-linked polyethylene and cross-linked polypropylene. The two materials described above are polymers with special physical properties and a three-dimensional network structure, so that the liquid cooling oil supply pipe 8 and the insulating layer 303 using this type of material have better strength, heat resistance and chemical resistance.

[0039] The outer part of the oil outlet pipe 301 is provided with an outer body of the oil outlet pipe 301. The outer body of the oil outlet pipe 301 surrounds and abuts against the outer periphery of the oil outlet pipe 301. The outer body of the oil outlet pipe 301 is used to protect the stability of the inside of the oil outlet pipe 301. The oil outlet pipe 301 can be made of one of stainless steel or copper materials. The contact surface of the sheath layer 1 wrapped on the insulation layer 2 is provided with an irregular anti-slip strip.

[0040] The present invention also provides a process for preparing an oil-cooled high-power liquid-cooled charging pile cable, comprising the following steps:

[0041] Step 1: Conductor 302 processing process, using 1+6+12+18 type 630 cage stranding machine, 35 square millimeters of conductor are divided into 14 reels of 81 / 0.2MM bundled wire strands, placed on 18 reels, a metal bellows is set in the center of the conductor 302, 14 reels of 81 / 0.2MM bundled wire strands are re-twisted on the metal bellows, and the compression coefficient of the conductor 302 is greater than or equal to 75%;

[0042] Step 2: Insulation layer extrusion process, using a plastic extruder to extrude cross-linked polyolefin material, the upper limit of the use environment condition is 150°, the extrusion process, the whole process is insulated, the insulation layer 303 is tightly wrapped around the conductor 302, and the extrusion die is cooled quickly to form by cooling; Step 3: Insulation layer 303 irradiation process, using physical electron irradiation technology, specifically including the following steps, first, the cable material is cleaned and dried, and then the cable material is placed in an irradiation room and irradiated by electron beam or gamma ray, the irradiation dose and irradiation time are adjusted according to the cable material specifications and manufacturing technical requirements, the irradiated cable material is cooled and left to stand and annealed accordingly to eliminate the influence of various stresses during the irradiation process, and the cable material is systematically tested for technical performance indicators to ensure that the irradiated cable material as a whole meets the design calibration technical indicators, and the charring property of the polymer is improved through the irradiation cross-linking reaction, and the flame retardancy and temperature resistance are improved;

[0043] Step 4: Liquid-cooled oil supply pipe 8 extrusion process, using 150° cross-linked polyolefin material using an extruder to extrude, during the extrusion operation, the entire process uses a vacuum tube extrusion process to make the inner and outer wall surfaces of the tube smooth, the inner diameter and the outer diameter are in a stable state, and the die outlet is quickly cooled;

[0044] Step 5: Assembly cabling process: assemble the first main core cable 3 and the second main core cable 4, the first signal cable 5 and the second signal cable 6, the grounding cable 11, the liquid cooling oil supply pipe 8, the first auxiliary power cable 9 and the second auxiliary power cable 10 on a 1250 type cabling machine. Each core wire is subjected to a back-twisting process to release the stress between the cores and increase the service life of the cable.

[0045] Step 6: Extrusion process of the sheath layer 1. The sheath layer 1 is made of polyether thermoplastic polyurethane material. The polyether thermoplastic polyurethane is put into a 120-type extruder to allow the polyether thermoplastic polyurethane to tightly wrap the cable core wire, and the corresponding die outlet is quickly cooled and formed.

[0046] The detwisting process comprises the following steps:

[0047] Step 1: Inspection process, check whether the cable as a whole has obvious distortion or damage. This process can be carried out manually and in conjunction with the CCD visual camera system. It should be noted that since the cable itself has a certain degree of elasticity, in order to improve the overall appearance of the cable and whether there are obvious damage and cracks on the surface, the CCD visual camera system is used to record and shoot, and manual comparison and analysis are performed through the visual camera content to improve the detection and identification efficiency of the cable.

[0048] Step 2: Pre-supporting process, fix the cable on a plane, apply appropriate tension to the cable as a whole, and pre-support it so that the stress inside the cable is released and stretched appropriately;

[0049] Step three: back-twisting, fixing the cable as a whole and reverse twisting the cable. The back-twisting direction is opposite to the twisting direction during the cabling process. The reverse twisting eliminates the original twist in the cable.

[0050] Step 4: Baking: Baking the cable after untwisting to ensure that the residual moisture inside the cable is removed and the insulation of the cable is ensured;

[0051] Step 5: Measurement and inspection: After the back-twist process is completed, make necessary measurements and inspections on the cable to ensure that the back-twist meets the requirements;

[0052] Step six: Combine and package the cables.

[0053] The above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An oil-cooled high-power liquid-cooled charging pile cable, characterized in that: The invention comprises a first main core cable (3) and a second main core cable (4), a heat insulation layer (2) wrapped on the outer periphery of the first main core cable (3) and the second main core cable (4), and a sheath layer (1) wrapped on the outside of the heat insulation layer (2); a liquid cooling oil outlet pipe (301) is arranged at the center of the first main core cable (3); a conductor (302) is wrapped on the outer side of the liquid cooling oil outlet pipe (301); an insulating layer (303) is wrapped on the outer side of the conductor (302); a liquid cooling oil supply pipe (8) is arranged at the lower part of the outside of the first main core cable (3); the liquid cooling oil supply pipe (8) and the liquid cooling oil outlet pipe (301) form a closed loop; a filling layer (7) is arranged on the outside of the liquid cooling oil supply pipe (8) and the first main core cable (3); and the liquid cooling oil outlet pipe (301) is used to dissipate heat from the conductor (302).

2. The oil-cooled high-power liquid-cooled charging pile cable according to claim 1, characterized in that: A first signal cable (5) and a second signal cable (6) are arranged on the upper part of the first main core cable (3); an aluminum foil layer (501) is arranged on the outside of the first signal cable (6); the inner side of the aluminum foil layer (501) is wrapped with a braided shielding layer (502); and a plurality of signal cables are arranged inside the braided shielding layer (502).

3. The oil-cooled high-power liquid-cooled charging pile cable according to claim 2, characterized in that: The braided shielding layer (502) is composed of 24 copper wires with a diameter of 0.12 mm, 8 of which are twisted into one strand and interwoven to cover the outside of the signal cable, thereby shielding and protecting the outside of the signal cable, and preventing other electromagnetic wave signals from the outside from affecting the normal signal transmission of the signal cable inside the braided shielding layer (502).

4. The oil-cooled high-power liquid-cooled charging pile cable according to claim 1, characterized in that: The conductor (302) is composed of a plurality of copper wire bundles, a metal bellows is provided at the center of the conductor (302), and the plurality of copper wires are tightly fitted around the metal bellows in the form of multiple twists, and the liquid cooling oil outlet pipe (301) and the liquid cooling oil supply pipe (8) are filled with coolant, and the type of coolant includes dimethyl silicone oil.

5. The oil-cooled high-power liquid-cooled charging pile cable according to claim 4, characterized in that: A first auxiliary power cable (9) and a second auxiliary power cable (10) are respectively arranged on the left and right sides of the liquid cooling oil supply pipe (8), and a grounding cable (11) is arranged on the lower side of the second auxiliary power cable (10).

6. The oil-cooled high-power liquid-cooled charging pile cable according to claim 1, characterized in that: The liquid-cooled oil supply pipe (8) and the insulating layer (303) are both made of a cross-linked polyolefin material, which may be a cross-linked polyethylene or a cross-linked polypropylene.

7. The oil-cooled high-power liquid-cooled charging pile cable according to claim 1, characterized in that: An oil outlet pipe outer body (3011) is arranged outside the liquid-cooled oil outlet pipe (301). The oil outlet pipe outer body (3011) surrounds and abuts against the outside of the liquid-cooled oil outlet pipe (301). The oil outlet pipe outer body (3011) is used to protect the stability of the inside of the liquid-cooled oil outlet pipe (301). The liquid-cooled oil outlet pipe (301) can be made of one of stainless steel and copper materials.

8. The oil-cooled high-power liquid-cooled charging pile cable according to claim 1, characterized in that: The contact surface of the jacket layer (1) wrapped around the heat insulation layer (2) is provided with an irregularly shaped anti-slip strip.

9. A preparation process for an oil-cooled high-power liquid-cooled charging pile cable, characterized in that: The following steps are involved: Step 1: Conductor (302) processing process, using a 1+6+12+18 type 630 cage stranding machine, 35 square millimeters of conductor are divided into 14 reels of 81 / 0.2MM bundled wire strands, placed on 18 reels, a metal bellows is set in the center of the conductor (302), and the 14 reels of 81 / 0.2MM bundled wire strands are re-twisted on the metal bellows, and the compression coefficient of the conductor (302) is greater than or equal to 75%; Step 2: Insulation layer extrusion process, a plastic extruder is used to extrude the cross-linked polyolefin material, the upper limit of the use environment condition is 150°, the whole extrusion process is subjected to insulation treatment, the insulation layer (303) is tightly coated on the conductor (302), and the extrusion die is subjected to rapid cooling to cool and form; Step 3: The insulation layer (303) irradiation process adopts physical electron irradiation technology, which specifically includes the following steps: first, the cable material is cleaned and dried; second, the cable material is placed in an irradiation room and irradiated with an electron beam or gamma ray; the irradiation dose and irradiation time are adjusted accordingly according to the cable material specifications and manufacturing technical requirements; the irradiated cable material is cooled and allowed to stand and annealed accordingly to eliminate the influence of various stresses during the irradiation process; and the cable material is systematically tested for technical performance indicators to ensure that the irradiated cable material as a whole meets the design calibration technical indicators; and the charring property of the polymer is improved through the irradiation cross-linking reaction, and the flame retardancy and temperature resistance are improved; Step 4: Liquid-cooled oil supply pipe (8) extrusion process, using 150° cross-linked polyolefin material using an extruder, during the extrusion operation, the entire process adopts a vacuum tube extrusion process to make the inner and outer wall surfaces of the tube smooth, the inner diameter and the outer diameter in a stable state, and the die outlet is quickly cooled; Step 5: cabling process, the first main core cable (3) and the second main core cable (4), the first signal cable (5) and the second signal cable (6), the ground cable (11), the liquid cooling oil supply pipe (8), the first auxiliary power cable (9) and the second auxiliary power cable (10) are assembled on a 1250 cabling machine, and each core wire is subjected to a detwisting process to release the stress between the cores and increase the service life of the cable; Step 6: Extrusion process of the sheath layer (1). The sheath layer (1) is made of polyether thermoplastic polyurethane material. The polyether thermoplastic polyurethane is put into a 120 extruder to allow the polyether thermoplastic polyurethane to tightly wrap around the cable core wire, and the corresponding die outlet is quickly cooled and formed.

10. The preparation process of an oil-cooled high-power liquid-cooled charging pile cable according to claim 9, characterized in that: The detwisting process comprises the following steps: Step 1: Inspection process, check whether the cable as a whole is obviously twisted or damaged. This process can be inspected manually and with a CCD visual camera system; Step 2: Pre-supporting process, fix the cable on a plane, apply appropriate tension to the cable as a whole, and pre-support it so that the stress inside the cable is released and stretched appropriately; Step three: back-twisting, fixing the cable as a whole and reverse twisting the cable. The back-twisting direction is opposite to the twisting direction during the cabling process. The reverse twisting eliminates the original twist in the cable. Step 4: Baking: Baking the cable after untwisting to ensure that the residual moisture inside the cable is removed and the insulation of the cable is ensured; Step 5: Measurement and inspection: After the back-twist process is completed, make necessary measurements and inspections on the cable to ensure that the back-twist meets the requirements; Step six: Combine and package the cables.

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