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CN-122025272-A - Spiral diversion type liquid cooling charging cable capable of resisting gas-liquid countercurrent

CN122025272ACN 122025272 ACN122025272 ACN 122025272ACN-122025272-A

Abstract

The application discloses a spiral diversion type liquid cooling charging cable capable of resisting gas-liquid countercurrent, which comprises a main power line, wherein the main power line comprises a conductive core body, a cladding layer and an insulating layer which are sequentially arranged from inside to outside, the cladding layer is tightly clad on the outer surface of the conductive core body, the outer surface of the cladding layer is a smooth cylindrical surface, the smooth cylindrical surface and the inner wall of the insulating layer are enclosed to form an annular liquid cooling flow channel, a diversion support piece is arranged in the annular liquid cooling flow channel, cooling liquid is enabled to flow in the annular liquid cooling flow channel in a screwing mode after entering the annular liquid cooling flow channel, and liquid working medium and gaseous working medium are effectively separated by centrifugal force generated by the screwing mode, so that the gas-liquid countercurrent phenomenon is restrained. The spiral flow guide structure can force the cooling liquid to form precession flow and form a stable centrifugal force field, so that continuous active separation of gas phase and liquid phase in the radial direction is realized, and the problem that the existing liquid cooling charging cable is frequently subjected to gas-liquid countercurrent phenomenon is solved.

Inventors

  • LIANG GANGTAO
  • ZHOU ZHILONG

Assignees

  • 大连理工大学

Dates

Publication Date
20260512
Application Date
20260326

Claims (10)

  1. 1. The spiral diversion type liquid cooling charging cable is characterized by comprising a main power line (1), wherein the main power line (1) comprises a conductive core body (1-1), a coating layer (1-2) and an insulating layer (1-5) which are sequentially arranged from inside to outside, the coating layer (1-2) is tightly coated on the outer surface of the conductive core body (1-1), the outer surface of the coating layer (1-2) is a smooth cylindrical surface, and the smooth cylindrical surface and the inner wall of the insulating layer (1-5) are surrounded to form an annular liquid cooling flow channel (1-4); The annular liquid cooling flow channel (1-4) is internally provided with a flow guide support piece (1-3), the flow guide support piece (1-3) enables cooling liquid to enter the annular liquid cooling flow channel (1-4) to form precession flow, and centrifugal force generated by the precession flow effectively separates liquid working medium from gaseous working medium, so that gas-liquid countercurrent phenomenon is restrained.
  2. 2. The spiral diversion type liquid cooling charging cable capable of resisting gas-liquid countercurrent according to claim 1, wherein the diversion support (1-3) is of a spiral diversion structure, and the spiral diversion structure is arranged along the axial extension of the main power line (1) and fixedly installed in the annular liquid cooling runner (1-4); The radial outer contour surface of the spiral flow guiding structure is tightly attached to the inner wall of the insulating layer (1-5), and the radial inner contour surface of the spiral flow guiding structure is tightly attached to the smooth cylindrical surface of the coating layer (1-2).
  3. 3. The spiral diversion type liquid cooling charging cable capable of resisting gas-liquid countercurrent according to claim 2, wherein the radial section of the spiral diversion structure is of a conical structure, the thickness of the outer side of the spiral diversion structure, which is attached to the inner wall of the insulating layer (1-5), is larger than the thickness of the inner side of the spiral diversion structure, which is attached to the smooth cylindrical surface of the coating layer (1-2), so that the spiral diversion structure forms stable support and seal in the annular liquid cooling flow channel (1-4).
  4. 4. A gas-liquid countercurrent resistant spiral flow-guiding type liquid-cooling charging cable according to claim 3, wherein the spiral flow-guiding structure is an integrally formed spiral flow-guiding rib, the number of the spiral flow-guiding ribs is at least four, and a plurality of the spiral flow-guiding ribs are uniformly arranged along the circumferential direction of the annular liquid-cooling flow channel (1-4), so that the annular liquid-cooling flow channel (1-4) is divided into a plurality of mutually independent spiral flow channels with the same volume and continuously communicated in the axial direction.
  5. 5. The spiral guide type liquid cooling charging cable resistant to gas-liquid countercurrent according to claim 4, wherein the screw pitch of the spiral guide rib is changed along the axial direction of the main power line (1), the screw pitch of the spiral guide rib in the expected high temperature section of the main power line (1) is uniformly set to be a first screw pitch, the screw pitch of the spiral guide rib in the expected low temperature section of the main power line (1) is uniformly set to be a second screw pitch, the first screw pitch is smaller than the second screw pitch, and the screw pitch between the expected high temperature section and the expected low temperature section is in smooth gradual transition.
  6. 6. The spiral diversion type liquid cooling charging cable capable of resisting gas-liquid countercurrent according to any one of claims 1-5, further comprising two protection wires (2), two liquid return pipes (3), two low-voltage auxiliary power wires (4) and two charging communication wires (5), wherein one protection wire (2) is arranged, one liquid return pipe (3) is arranged, two low-voltage auxiliary power wires (4) are arranged, and two charging communication wires (5) are arranged; The two main power lines (1) are oppositely arranged at intervals, and the protection line (2) and the liquid return pipe (3) are oppositely arranged between the two main power lines (1) along the central connecting line of the two main power lines (1); The two low-voltage auxiliary power lines (4) are respectively arranged between the protection line (2) and the two main power lines (1), and the center connecting lines of the two low-voltage auxiliary lines pass through the center of the protection line (2); The two charging communication lines (5) are respectively arranged between the liquid return pipe (3) and the two main power lines (1), and the center connecting lines of the two low-voltage auxiliary lines pass through the center of the liquid return pipe (3).
  7. 7. The spiral diversion type liquid cooling charging cable capable of resisting gas-liquid countercurrent according to claim 6, wherein a filling layer (6) is arranged in a gap between each core wire, and the outer contour of the filling layer (6) is a cylindrical surface and is used for fixing the positions of each core wire and ensuring the roundness of the whole cable; The outer surface of the filling layer (6) is sequentially coated with a shielding layer (7) and a wrapping belt layer (8) to form a wire core group, and a sheath layer (9) is arranged on the outer surface of the wire core group.
  8. 8. The spiral diversion type liquid cooling charging cable capable of resisting gas-liquid countercurrent according to claim 1, wherein connectors are arranged at two ends of the main power line (1), diversion cavities are arranged in the connectors, the diversion cavities are in fluid conduction with the annular liquid cooling runners (1-4), and two ends of the liquid return pipe (3) are in fluid conduction connection with the connectors through quick-plug type fluid connectors (10) to form a closed cooling liquid circulation loop.
  9. 9. The spiral diversion type liquid cooling charging cable capable of resisting gas-liquid countercurrent according to claim 1, wherein the conductive core body (1-1) is formed by twisting a plurality of strands of metal wires, and the nominal sectional area of the conductive core body is 35mm < 2 > -60mm < 2 >; The thickness of the coating layer (1-2) is 0.8-1.2mm, the thickness of the insulating layer (1-5) is 0.1-0.3mm larger than the thickness of the coating layer (1-2), and the interval between the inner wall of the insulating layer (1-5) and the outer surface of the coating layer (1-2) is 0.8-1.2mm; The cooling liquid is an electronic fluoridation liquid with good insulativity, chemical stability and suitable phase transition temperature.
  10. 10. The spiral diversion type liquid cooling charging cable capable of resisting gas-liquid countercurrent according to claim 1, wherein the diversion support piece (1-3) and the insulating layer (1-5) are made of high-temperature resistant polymer composite materials with insulating performance so as to prevent electrical short circuit inside the main power line (1).

Description

Spiral diversion type liquid cooling charging cable capable of resisting gas-liquid countercurrent Technical Field The invention relates to the technical field of thermal management of high-current transmission cables. In particular to a spiral diversion type liquid cooling charging cable capable of resisting gas-liquid countercurrent. Background Along with the rapid development of the electric automobile rapid charging technology, the current and the power density borne by a charging cable are continuously improved, the joule heat generated by a conductor is greatly increased, and the charging cable becomes a key bottleneck for limiting the charging efficiency, the service life of the cable and the use safety, and the requirements of high-power rapid charging on heat dissipation of the cable are increasingly severe. The traditional cooling mode of current charging cable mainly is air cooling and single-phase liquid cooling, and wherein air cooling radiating efficiency is low, and single-phase liquid cooling only relies on coolant liquid sensible heat to exchange the area heat, and the heat dissipation capacity is restricted by medium specific heat, flow, and both are difficult to satisfy the high heat flow density heat dissipation demand of next generation high power fast charging cable. In order to solve the above-mentioned problems, the phase-change circulating liquid cooling technology (for example, two-phase flow cooling) has become an important research direction at present because of its higher heat dissipation potential, and the phase-change circulating liquid cooling technology utilizes the significant latent heat exchange accompanied by the phase change (such as boiling) of the cooling liquid after absorbing heat to realize heat dissipation, so that the phase-change circulating liquid cooling technology can theoretically adapt to the heat dissipation requirement of the high-power fast-charging cable. In the prior art, a typical phase-change liquid cooling solution is to arrange an annular liquid cooling channel at the outer side of a cable conductor, isolate heat of the conductor through the structure and provide a flowing space for cooling liquid, but because the charging cable has the structural characteristics of slender and flexible, the charging cable is influenced by complex working conditions such as gravity, bending and the like in actual use, so that engineering application of the technology faces great challenges. In the slender flow channel, the gas-liquid working medium is easy to form a gas-liquid two-phase mixture after absorbing heat, and is easy to generate the phenomena of plug flow, intermittent flow and the like of unstable flow due to the coupling effect of density difference and flow pressure drop, so that heat exchange is discontinuous, heat dissipation capacity is suddenly reduced, even local dryness and conductor overheating are caused, and more importantly, under the action of gravity or cable bending, the high-density liquid working medium is easy to flow reversely with upward flowing gaseous steam, namely, the phenomenon of gas-liquid countercurrent, the phenomenon seriously hinders or even interrupts the circulation of the cooling liquid, so that a liquid cooling system is completely disabled, great potential safety hazard is brought to high-power charging, and the phenomenon becomes a core obstacle of the phase change circulation liquid cooling technology in the field of fast-charging cables. In summary, there is a need for a liquid cooling charging cable that is adapted to a slim and flexible structure of the charging cable, can effectively inhibit the unstable flow of the gas-liquid two-phase flow, avoid the countercurrent flow of the gas-liquid, and ensure efficient phase change heat dissipation. Disclosure of Invention Therefore, the technical problem to be solved by the invention is to provide the spiral diversion type liquid cooling charging cable capable of resisting the countercurrent of gas and liquid, and the technical problems that in the prior art, in the phase change heat dissipation process of the charging cable adopting the annular liquid cooling channel, the heat dissipation efficiency is reduced, the local overheat risk exists and the system working reliability is reduced due to the fact that the flow instability and the reflux of the internal gas-liquid two-phase flow are easy to occur are solved. In order to solve the technical problems, the invention provides the following technical scheme: The utility model provides a spiral water conservancy diversion formula liquid cooling charging cable of anti gas-liquid countercurrent, includes the main power line, the main power line includes conductive core, cladding and insulating layer that sets gradually from inside to outside, the cladding closely coats the surface of conductive core, the surface of cladding is smooth cylindrical surface, smooth cylindrical surface encloses with the inner wall of insulat