Liquid-cooled vehicle-mounted high-voltage cable and preparation method and use method thereof

Abstract

The invention relates to the technical field of cables for high-end equipment manufacturing, and particularly discloses a liquid-cooled vehicle-mounted high-voltage cable and a preparation method and a use method thereof. The high-voltage cable comprises a cooling pipe with a hollow structure, a conductor layer arranged outside the cooling pipe, and an insulating layer arranged outside the conductor layer, the cooling pipe is composed of a cooling base pipe which is made of metal and is of a hollow structure and a metal capillary layer attached to the inner wall of the cooling base pipe. In the working condition environment, the cooling pipe is filled with liquid metal in a negative pressure sealing mode. Closed circulation flow is formed in the cooling channel of the same cooling pipe so as to efficiently and reliably cool and dissipate heat of the external conductor layer, the structural size of the high-voltage cable used in a working condition environment is greatly reduced, the formed structure is compact, and the service life of the high-voltage cable is prolonged. And the technical requirements of laying in a narrow and narrow laying space in the electric automobile are effectively met.

Description

Technical Field

[0001] The present invention relates to the technical field of cables for high-end equipment manufacturing, and specifically to a liquid-cooled high-voltage cable for use on new energy electric vehicles, as well as a preparation method and a use method of the high-voltage cable. Background Art

[0002] New energy electric vehicles use on-board power as driving power, so there is a complex power system inside the electric vehicle, which is mainly composed of charging ports, batteries, motors and other electrical equipment. In order to adapt to the working characteristics of electric vehicles, high-voltage cables that can bear the heavy task of high-voltage and high-current power transmission are needed to electrically connect the charging ports and batteries, and between batteries and motors in electric vehicles. However, high-voltage cables with high voltage and high current face severe challenges in their service stability and safety due to obvious heating in the application of on-board working conditions. Therefore, introducing a liquid cooling design structure in the on-board high-voltage cables of electric vehicles is an effective technical means to reliably dissipate heat for high-voltage cables.

[0003] In order to construct a circulating flow path for the cooling liquid, many of the currently disclosed liquid-cooled cables either form two relatively independent cooling channels, one in and one out, inside the same cable, such as the Chinese patent document entitled "A liquid-cooled cable capable of monitoring liquid leakage and a liquid leakage monitoring and control system", publication number CN 119108138 A, publication date December 10, 2024, and the technology entitled "A high-power liquid-cooled cable and its preparation method", publication number CN118471603A, publication date August 9, 2024; or two cables each having a single cooling pipe are used in a matching pair, with the cooling pipe of one cable responsible for the cooling liquid entering and the cooling pipe of the other cable responsible for the cooling liquid flowing out, such as the Chinese patent document entitled "A high-power liquid-cooled cable", publication number CN 118073017 A, with a publication date of May 24, 2024, and technologies named "liquid-cooled high-voltage cable", with a publication number of CN217386751 U, and a publication date of September 6, 2022. Such liquid-cooled cables with a circulating flow path, whether a single cooling channel for the circulation of cooling liquid or a double cooling channel for the circulation of cooling liquid, will greatly increase the structural dimensions of the cable when used in a working environment due to the existence of a double cooling channel structure (such as the technology with publication numbers CN 118073017 A and CN 217386751 U, which showed a single cooling channel structure at the time of disclosure, but required a double pair when used in a working environment), which is not conducive to the compactness of the cable structure in a working environment, has high technical requirements for the laying space, and increases the difficulty of the laying technology.

[0004] Returning to the working environment of high-voltage electrical connection inside the electric vehicle, the design structure of the liquid-cooled cable is obviously difficult to meet the narrow and cramped laying space inside the electric vehicle. Moreover, the liquid-cooled cable usually uses liquid cooling media such as silicone oil with relatively low thermal conductivity efficiency for cooling and heat dissipation, and its heat dissipation effect is relatively poor. Summary of the invention

[0005] The technical purpose of the present invention is to provide a liquid-cooled vehicle-mounted high-voltage cable with a compact structure and excellent heat dissipation effect, in view of the particularity of the working environment of the above-mentioned new energy electric vehicle-mounted high-voltage cable and the technical deficiencies of the existing liquid-cooled cables, through a cooling channel of a single cooling pipe, so that the cooling medium can form a closed circulation flow, as well as a preparation method and a use method of the high-voltage cable.

[0006] The technical purpose of the present invention is achieved by the following technical solution: a liquid-cooled vehicle-mounted high-voltage cable, comprising a cooling pipe with a hollow structure, a conductor layer arranged outside the cooling pipe, and an insulating layer arranged outside the conductor layer; The cooling tube is composed of a cooling base tube made of metal and having a hollow structure, and a metal capillary layer attached to the inner wall of the cooling base tube; In the working environment, the negative pressure seal inside the cooling pipe is filled with liquid metal.

[0007] As one of the preferred technical solutions, the cooling base tube of the cooling tube is a hollow tube with an oxygen-free copper structure.

[0008] As one of the preferred technical solutions, the metal capillary layer of the cooling tube is a sintered attachment structure of alloy metal powder on the inner wall of the cooling base tube.

[0009] Furthermore, the alloy metal powder is a mixture of nickel metal powder and copper metal powder, and the mixing ratio is 8:2.

[0010] As one of the preferred technical solutions, the liquid metal is liquid metallic sodium.

[0011] As one of the preferred technical solutions, the conductor layer is a spirally twisted structure of a plurality of soft copper wires with a diameter of 0.1 mm to 0.2 mm outside the cooling tube.

[0012] As one of the preferred technical solutions, the insulating layer is an extruded structure of platinum-vulcanized silicone rubber or irradiated AC polyolefin material outside the conductor layer.

[0013] A method for preparing the above-mentioned liquid-cooled vehicle-mounted high-voltage cable, the preparation method comprising the following process steps: Step 1. Using oxygen-free copper to prepare a cooling base tube with a hollow structure and meeting the design dimensions; Step 2. Evenly mix nickel-copper metal powder that meets the design requirements and fill it into the hollow channel of the cooling substrate tube; Step 3. Vibrating to evenly distribute the nickel-copper metal powder on the inner wall of the cooling substrate tube; Step 4. Place the cooled substrate tube in step 3 into a sintering furnace; Heat the sintering furnace to 540℃~650℃ and keep it warm for at least 20 minutes; A metal cooling tube with a metal capillary layer on the inner wall is obtained after it comes out of the furnace; Step 5. Spirally twisting soft copper wires that meet the design requirements on the outside of the metal cooling pipe in step 4 to obtain a conductor layer on the outside of the metal cooling pipe; Step 6. Extruding platinum-cured silicone rubber or irradiated AC polyolefin material on the outside of the conductor layer in step 5 according to the designed thickness; The finished high voltage cable is obtained.

[0014] A method for using the above-mentioned liquid-cooled vehicle-mounted high-voltage cable, the method comprising the following technical measures: The vehicle-mounted high-voltage cable is fixedly laid between the corresponding electrical equipment inside the new energy electric vehicle, and one end of the cooling pipe is connected to the radiator after current blocking treatment, and the other end is insulated and sealed; Apply negative pressure to the hollow channel of the cooling pipe of the high-voltage cable; Injecting liquid metal into the hollow channel of the cooling tube in a negative pressure environment; Sealing the hollow channel of the cooling pipe; The heat generated by the current passing through the conductor layer is transferred to the liquid metal through the cooling tube. The heated liquid metal evaporates and gasifies in the sealed hollow channel of the cooling tube. The vaporized liquid metal flows to the radiator for heat exchange and condenses into liquid under the capillary effect of the metal capillary layer. The liquid liquid metal flows back to the hollow channel of the cooling tube to form a closed cycle.

[0015] The beneficial technical effect of the present invention is that the above technical measures are aimed at the particularity of the working environment of the above-mentioned new energy electric vehicle-mounted high-voltage cable, and the metal tube with a capillary core layer on the inner wall is used as the cooling tube inside the conductor layer, and the high thermal conductivity, amorphous, and flowable industrial coolant-liquid metal is used as the cooling medium filled into the cooling tube. The liquid metal is gasified after heating, liquefied after condensation, and flows through the capillary core layer under the action of the capillary effect after gasification. A closed circulation flow is formed in the cooling channel of the same cooling tube, so as to efficiently and reliably cool and dissipate the heat of the external conductor layer, without the need to be matched with other cables for use. It can be seen that the above technical measures do not need to form a double cooling channel structure under the premise of satisfying the establishment of a cooling channel for the circulation of cooling liquid, which is conducive to greatly reducing the structural size of the high-voltage cable when used in the working environment, making its molding structure compact, and effectively meeting the laying technical requirements in the narrow and cramped laying space inside the electric vehicle. Moreover, the above technical measures use liquid metal with high thermal conductivity and industrial coolant as the cooling medium. Its thermal conduction efficiency is far better than silicone oil, etc., and it has excellent heat dissipation effect, which effectively meets the high voltage and high current power transmission technical requirements of electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 This is a reference diagram of the use status of the present invention in a working environment.

[0018] The meaning of the codes in the figure: 1—cooling tube; 11—cooling base tube; 12—metal capillary layer; 2—conductor layer; 3—insulating layer; 4—radiator. DETAILED DESCRIPTION

[0019] The present invention relates to the field of cable technology for high-end equipment manufacturing, specifically a liquid-cooled high-voltage cable for new energy electric vehicles, as well as a preparation method and a method for using the high-voltage cable. The main technical solution of the present invention is specifically described below in conjunction with multiple embodiments. Figure 1 and Figure 2 The technical solution of the present invention is explained clearly and in detail; although other embodiments are not separately drawn with drawings, their main structures can still refer to the drawings of embodiment 1.

[0020] It should be noted that the drawings of the present invention are schematic, and unnecessary details have been simplified to clarify the technical purpose of the present invention, so as to avoid blurring the technical solution of the present invention that contributes to the prior art. In addition, the expressions "approximately", "substantially" and the like regarding quantity or matching relationship in the following text mean that reasonable assembly errors and processing errors in the industry are allowed to exist, and do not literally express absolute quantities or matching relationships.

[0021] Example 1 See also Figure 1 and Figure 2 As shown, the liquid-cooled vehicle-mounted high-voltage cable of the present invention comprises a cooling tube 1 with a hollow structure, a conductor layer 2 arranged outside the cooling tube 1 , and an insulating layer 3 arranged outside the conductor layer 2 .

[0022] Specifically, the cooling tube 1 is composed of a cooling base tube 12 with a hollow structure formed of an oxygen-free copper material with excellent heat transfer performance, and a metal capillary layer 11 with excellent permeability attached to the inner wall of the cooling base tube 12. The metal capillary layer 11 is a sintered attachment structure of alloy metal powder of nickel metal powder and copper metal powder on the inner wall of the cooling base tube 12, and the nickel metal powder and the copper metal powder of the alloy metal powder are mixed in a ratio of about 8:2, which can obtain a capillary pore structure with excellent permeability on the inner wall of the cooling base tube 12.

[0023] The conductor layer 2 is a spirally twisted structure of a plurality of soft copper wires with a diameter of about 0.1 mm outside the cooling tube 1 .

[0024] The insulating layer 3 is an extruded structure of platinum vulcanized silicone rubber with excellent heat resistance, good insulation performance and a long-term working temperature of 150° C. on the outside of the conductor layer 2 .

[0025] In the high-voltage electrical connection working environment inside the electric vehicle, the cooling tube 1 is negatively pressure-sealed and filled with liquid metallic sodium which has high thermal conductivity, is amorphous and flowable and is used as a coolant in industry. The liquid metal is used as the cooling medium, and the cooling base tube 12 of the cooling tube 1 is used as the evaporation heating surface. A radiator 4 is connected to one end of the cooling tube 1 to form a condensation end for heat exchange and condensation.

[0026] The method for preparing the above-mentioned liquid-cooled vehicle-mounted high-voltage cable comprises the following process steps: Step 1. Using oxygen-free copper to prepare a cooling base tube with a hollow structure and meeting the design dimensions; Step 2. Evenly mix nickel-copper metal powder that meets the design requirements and fill it into the hollow channel of the cooling substrate tube; Step 3. Evenly distribute the nickel-copper metal powder on the inner wall of the cooling substrate tube by shaking; Step 4. Place the cooled substrate tube in step 3 into a sintering furnace; The sintering furnace is heated to about 600°C and kept at this temperature for about 22 minutes to ensure that a capillary pore structure with excellent permeability is obtained on the inner wall of the cooling substrate tube; A metal cooling tube with a metal capillary layer on the inner wall is obtained after it comes out of the furnace; Step 5. Spirally twisting soft copper wires that meet the design requirements on the outside of the metal cooling pipe in step 4 to obtain a conductor layer on the outside of the metal cooling pipe; Step 6. Extruding platinum vulcanized silicone rubber according to the designed thickness onto the outside of the conductor layer in step 5; The finished high voltage cable is obtained.

[0027] The method of using the above-mentioned liquid-cooled vehicle-mounted high-voltage cable in a working environment, such as Figure 2 As shown, the following technical measures are included: The vehicle-mounted high-voltage cable is fixedly laid between the corresponding electrical equipment inside the new energy electric vehicle (for example, between the charging interface and the battery, or between the battery and the motor, etc.). Due to the direct contact between the cooling pipe 1 and the conductor layer 2 and the metal conductive properties of the cooling pipe 1, one end of the cooling pipe 1 needs to be connected to the radiator 4 after being subjected to current blocking treatment, and the other end needs to be subjected to insulation and sealing treatment; Perform negative pressure treatment on the hollow channel of the cooling pipe 1 of the high-voltage cable; Injecting liquid metal into the hollow channel of the cooling tube 1 in a negative pressure environment, so that the liquid metal fills the metal capillary layer 11 on the inner wall of the cooling tube 1; The hollow channel of the cooling pipe 1 is sealed; The heat generated by the current passing through the conductor layer 2 is transferred to the liquid metal through the annular wall of the cooling tube 1. The heated liquid metal evaporates and vaporizes in the sealed hollow channel of the cooling tube 1. The vaporized liquid metal flows to the radiator 4 for heat exchange due to the tiny pressure difference and the capillary effect of the metal capillary layer 11, and is condensed into liquid. The liquid liquid metal then flows back into the hollow channel of the cooling tube 1, forming a closed cycle to effectively cool and dissipate the heat of the external conductor layer 2.

[0028] Example 2 The liquid-cooled vehicle-mounted high-voltage cable of the present invention comprises a cooling pipe with a hollow structure, a conductor layer arranged outside the cooling pipe, and an insulating layer arranged outside the conductor layer.

[0029] Specifically, the cooling tube is composed of a cooling base tube made of oxygen-free copper and having a hollow structure, and a metal capillary layer attached to the inner wall of the cooling base tube. The metal capillary layer is a sintered attachment structure of alloy metal powder of nickel metal powder and copper metal powder on the inner wall of the cooling base tube, and the nickel metal powder and the copper metal powder of the alloy metal powder are mixed in a ratio of about 8:2.

[0030] The conductor layer is a spirally twisted structure of a plurality of soft copper wires with a diameter of about 0.2 mm outside the cooling tube.

[0031] The insulating layer is an extruded structure of irradiated AC polyolefin material with excellent heat resistance, good insulation performance and a long-term working temperature of 150°C on the outside of the conductor layer.

[0032] In the high-voltage electrical connection working environment inside the electric vehicle, the negative pressure seal inside the cooling pipe is filled with liquid metallic sodium which has high thermal conductivity, is amorphous and flowable and is used as a coolant in industry. The liquid metal is used as the cooling medium, and the cooling base tube of the cooling pipe is used as the evaporation heating surface. A radiator is connected to one end of the cooling pipe to form a condensation end for heat exchange and condensation.

[0033] The method for preparing the above-mentioned liquid-cooled vehicle-mounted high-voltage cable comprises the following process steps: Step 1. Using oxygen-free copper to prepare a cooling base tube with a hollow structure and meeting the design dimensions; Step 2. Evenly mix nickel-copper metal powder that meets the design requirements and fill it into the hollow channel of the cooling substrate tube; Step 3. Evenly distribute the nickel-copper metal powder on the inner wall of the cooling substrate tube by shaking; Step 4. Place the cooled substrate tube in step 3 into a sintering furnace; The sintering furnace is heated to about 650°C and kept at this temperature for about 20 minutes to ensure that a capillary pore structure with excellent permeability is obtained on the inner wall of the cooling substrate tube; A metal cooling tube with a metal capillary layer on the inner wall is obtained after it comes out of the furnace; Step 5. Spirally twisting soft copper wires that meet the design requirements on the outside of the metal cooling pipe in step 4 to obtain a conductor layer on the outside of the metal cooling pipe; Step 6. Extruding the irradiated AC polyolefin material according to the designed thickness outside the conductor layer of step 5; The finished high voltage cable is obtained.

[0034] The method for using the above-mentioned liquid-cooled vehicle-mounted high-voltage cable in a working environment includes the following technical measures: The on-board high-voltage cable is fixedly laid between the corresponding electrical equipment inside the new energy electric vehicle (for example, between the charging port and the battery, or between the battery and the motor, etc.). Due to the direct contact between the cooling pipe and the conductor layer and the metal conductive properties of the cooling pipe, one end of the cooling pipe needs to be connected to the radiator after blocking the current, and the other end needs to be insulated and sealed; Apply negative pressure to the hollow channel of the cooling pipe of the high-voltage cable; Injecting liquid metal into the hollow channel of the cooling tube in a negative pressure environment so that the liquid metal fills the metal capillary layer on the inner wall of the cooling tube; Sealing the hollow channel of the cooling pipe; The heat generated by the current passing through the conductor layer is transferred to the liquid metal through the annular wall of the cooling tube. The heated liquid metal evaporates and vaporizes in the sealed hollow channel of the cooling tube. The vaporized liquid metal flows to the radiator for heat exchange due to the tiny pressure difference and the capillary effect of the metal capillary layer, and condenses into liquid. The liquid liquid metal then flows back into the hollow channel of the cooling tube, forming a closed cycle to effectively cool and dissipate the heat of the external conductor layer.

[0035] Example 3 The liquid-cooled vehicle-mounted high-voltage cable of the present invention comprises a cooling pipe with a hollow structure, a conductor layer arranged outside the cooling pipe, and an insulating layer arranged outside the conductor layer.

[0036] Specifically, the cooling tube is composed of a cooling base tube made of oxygen-free copper and having a hollow structure, and a metal capillary layer attached to the inner wall of the cooling base tube. The metal capillary layer is a sintered attachment structure of alloy metal powder of nickel metal powder and copper metal powder on the inner wall of the cooling base tube, and the nickel metal powder and the copper metal powder of the alloy metal powder are mixed in a ratio of about 8:2.

[0037] The conductor layer is a spirally twisted structure of a plurality of soft copper wires with a diameter of about 0.15 mm outside the cooling tube.

[0038] The insulating layer is an extruded structure of platinum vulcanized silicone rubber on the outside of the conductor layer, which has excellent heat resistance, good insulation performance and a long-term working temperature of 150°C.

[0039] In the high-voltage electrical connection working environment inside the electric vehicle, the negative pressure seal inside the cooling pipe is filled with liquid metallic sodium which has high thermal conductivity, is amorphous and flowable and is used as a coolant in industry. The liquid metal is used as the cooling medium, and the cooling base tube of the cooling pipe is used as the evaporation heating surface. A radiator is connected to one end of the cooling pipe to form a condensation end for heat exchange and condensation.

[0040] The method for preparing the above-mentioned liquid-cooled vehicle-mounted high-voltage cable comprises the following process steps: Step 1. Using oxygen-free copper to prepare a cooling base tube with a hollow structure and meeting the design dimensions; Step 2. Evenly mix nickel-copper metal powder that meets the design requirements and fill it into the hollow channel of the cooling substrate tube; Step 3. Evenly distribute the nickel-copper metal powder on the inner wall of the cooling substrate tube by shaking; Step 4. Place the cooled substrate tube in step 3 into a sintering furnace; The sintering furnace is heated to about 540°C and kept at this temperature for about 25 minutes to ensure that a capillary pore structure with excellent permeability is obtained on the inner wall of the cooling substrate tube; A metal cooling tube with a metal capillary layer on the inner wall is obtained after it comes out of the furnace; Step 5. Spirally twisting soft copper wires that meet the design requirements on the outside of the metal cooling pipe in step 4 to obtain a conductor layer on the outside of the metal cooling pipe; Step 6. Extruding platinum vulcanized silicone rubber according to the designed thickness onto the outside of the conductor layer in step 5; The finished high voltage cable is obtained.

[0041] The method for using the above-mentioned liquid-cooled vehicle-mounted high-voltage cable in a working environment includes the following technical measures: The on-board high-voltage cable is fixedly laid between the corresponding electrical equipment inside the new energy electric vehicle (for example, between the charging port and the battery, or between the battery and the motor, etc.). Due to the direct contact between the cooling pipe and the conductor layer and the metal conductive properties of the cooling pipe, one end of the cooling pipe needs to be connected to the radiator after blocking the current, and the other end needs to be insulated and sealed; Apply negative pressure to the hollow channel of the cooling pipe of the high-voltage cable; Injecting liquid metal into the hollow channel of the cooling tube in a negative pressure environment so that the liquid metal fills the metal capillary layer on the inner wall of the cooling tube; Sealing the hollow channel of the cooling pipe; The heat generated by the current passing through the conductor layer is transferred to the liquid metal through the annular wall of the cooling tube. The heated liquid metal evaporates and vaporizes in the sealed hollow channel of the cooling tube. The vaporized liquid metal flows to the radiator for heat exchange due to the tiny pressure difference and the capillary effect of the metal capillary layer, and condenses into liquid. The liquid liquid metal then flows back into the hollow channel of the cooling tube, forming a closed cycle to effectively cool and dissipate the heat of the external conductor layer.

[0042] The above embodiments are only used to illustrate the present invention, but not to limit it.

[0043] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the above embodiments or make equivalent replacements for some of the technical features therein, such as adopting other tubular structures for the conductor layer that can carry high voltage and high current transmission tasks, etc. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the present invention.

Claims

1. A liquid-cooled vehicle-mounted high-voltage cable, comprising a cooling tube (1) with a hollow structure, a conductor layer (2) arranged outside the cooling tube (1), and an insulating layer (3) arranged outside the conductor layer (2); Features: The cooling tube (1) is composed of a cooling base tube (12) made of metal and having a hollow structure, and a metal capillary layer (11) attached to the inner wall of the cooling base tube (12); In a working environment, the cooling tube (1) is negatively pressure-sealed and filled with liquid metal.

2. The liquid-cooled vehicle-mounted high-voltage cable according to claim 1, characterized in that: The cooling base tube (12) of the cooling tube (1) is a hollow tube with an oxygen-free copper structure.

3. The liquid-cooled vehicle-mounted high-voltage cable according to claim 1 or 2, characterized in that: The metal capillary layer (11) of the cooling tube (1) is a sintered attachment structure of alloy metal powder on the inner wall of the cooling base tube (12).

4. The liquid-cooled vehicle-mounted high-voltage cable according to claim 3, characterized in that: The alloy metal powder is a mixture of nickel metal powder and copper metal powder, and the mixing ratio is 8:

2.

5. The liquid-cooled vehicle-mounted high-voltage cable according to claim 1, characterized in that: The liquid metal is liquid metallic sodium.

6. The liquid-cooled vehicle-mounted high-voltage cable according to claim 1, characterized in that: The conductor layer (2) is a spirally twisted structure of a plurality of soft copper wires with a diameter of 0.1 mm to 0.2 mm on the outside of the cooling tube (1).

7. The liquid-cooled vehicle-mounted high-voltage cable according to claim 1, characterized in that: The insulating layer (3) is an extruded structure of platinum vulcanized silicone rubber or irradiated AC polyolefin material on the outside of the conductor layer (2).

8. A method for preparing the liquid-cooled vehicle-mounted high-voltage cable according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following process steps: Step 1. Using oxygen-free copper to prepare a cooling base tube with a hollow structure and meeting the design dimensions; Step 2. Evenly mix nickel-copper metal powder that meets the design requirements and fill it into the hollow channel of the cooling substrate tube; Step 3. Vibrating to evenly distribute the nickel-copper metal powder on the inner wall of the cooling substrate tube; Step 4. Place the cooled substrate tube in step 3 into a sintering furnace; Heat the sintering furnace to 540℃~650℃ and keep it warm for at least 20 minutes; A metal cooling tube with a metal capillary layer on the inner wall is obtained after it comes out of the furnace; Step 5. Spirally twisting soft copper wires that meet the design requirements on the outside of the metal cooling pipe in step 4 to obtain a conductor layer on the outside of the metal cooling pipe; Step 6. Extruding platinum-cured silicone rubber or irradiated AC polyolefin material on the outside of the conductor layer in step 5 according to the designed thickness; The finished high voltage cable is obtained.

9. A method for using the liquid-cooled vehicle-mounted high-voltage cable according to any one of claims 1 to 7, characterized in that: The method of use includes the following technical measures: The vehicle-mounted high-voltage cable is fixedly laid between the corresponding electrical equipment inside the new energy electric vehicle, and one end of the cooling pipe is connected to the radiator after current blocking treatment, and the other end is insulated and sealed; Apply negative pressure to the hollow channel of the cooling pipe of the high-voltage cable; Injecting liquid metal into the hollow channel of the cooling tube in a negative pressure environment; Sealing the hollow channel of the cooling pipe; The heat generated by the current passing through the conductor layer is transferred to the liquid metal through the cooling tube. The heated liquid metal evaporates and gasifies in the sealed hollow channel of the cooling tube. The vaporized liquid metal flows to the radiator for heat exchange and condenses into liquid under the capillary effect of the metal capillary layer. The liquid liquid metal flows back to the hollow channel of the cooling tube to form a closed cycle.

Images