Heat dissipation cable for new energy charging

Abstract

The invention belongs to the technical field of smart grid power cables, and particularly discloses a heat dissipation cable for new energy charging, which comprises a heat conduction layer, a central support body and an outer conductor, a wrapping layer is arranged on the outer side of the heat conduction layer, an outer sheath is arranged on the outer side of the wrapping layer, and an inner cooling cavity is formed in the central support body. An arc-shaped groove for supporting the outer conductor is formed outside the central supporting body; an auxiliary positioning strip is arranged on the outer side of the central supporting body, the auxiliary positioning strip is embedded in a gap between the two adjacent outer conductors, the cross section of the auxiliary positioning strip is in a sector shape, the two sides of the auxiliary positioning strip cover the outer conductors, and the outer side wall of the auxiliary positioning strip abuts against the inner side wall of the heat conduction layer; the cable is high in structural stability, liquid cooling, heat dissipation of the outer conductor and prevention of heat accumulation inside can be performed through the inner cooling cavity on the central supporting body, and the outer conductor releases internal heat to the outside through the heat conduction layer on the outer side, so that the heat dissipation effect of the outer conductor is greatly improved, and a good working environment is provided for the cable core.

Description

Technical Field

[0001] The present invention belongs to the technical field of smart grid power cables, and in particular relates to a heat dissipation cable for new energy charging. Background Art

[0002] As the charging power of new energy vehicles continues to increase, the heat dissipation performance and structural stability of cables, as the core carrier of energy transmission, are directly related to charging efficiency and safety. Traditional cables often use a single-layer thermal conductive structure or passive heat dissipation design. Under continuous high current conditions, heat easily accumulates within the cable core, leading to accelerated insulation aging, increased transmission loss, and even safety hazards. Furthermore, when conventional cables are repeatedly bent, the conductors are prone to radial deviation, causing internal magnetic field distortion and localized overheating, further exacerbating the risk of thermal-electrical coupling failure. Summary of the Invention

[0003] To address the problem that the heat dissipation efficiency of cables in the existing technology needs to be improved, a heat dissipation cable for new energy charging is proposed. The present invention provides the following technical solutions:

[0004] A heat dissipation cable for new energy charging, comprising a heat-conducting layer, a central support body and N outer conductors, N ≥ 3; a wrapping layer is provided on the outside of the heat-conducting layer, an outer sheath is provided on the outside of the wrapping layer, an inner cold cavity for accommodating cooling liquid is provided inside the central support body, and N arc-shaped grooves for supporting and positioning the outer conductors are provided on the outside of the central support body; N auxiliary positioning strips are provided on the outside of the central support body, the auxiliary positioning strips are embedded in the gap between two adjacent outer conductors, the cross-section of the auxiliary positioning strips is fan-shaped, the two side covers of the auxiliary positioning strips are provided on the outer conductors, and the outer side walls of the auxiliary positioning strips abut against the inner side walls of the heat-conducting layer.

[0005] As a further development of this solution, in order to improve the heat dissipation effect, an external cooling cavity for cooling the outer side of the outer conductor is provided inside the auxiliary positioning strip.

[0006] Furthermore, the outer cooling chamber is arranged symmetrically with respect to the auxiliary positioning strip.

[0007] As a preferred solution of this solution, a mounting hole for mounting a signal line is provided in the middle of the auxiliary positioning bar.

[0008] Furthermore, the shape of the mounting hole is elliptical, crescent-shaped, isosceles trapezoidal, or fan-shaped.

[0009] As a preferred embodiment of this solution, the inner cold cavity includes a central cavity and N outer cavities circumferentially and evenly spaced outside the central cavity. A support bar group is provided on the inner side wall of the outer cavity, and the support bar group includes two support protrusions that are opposite and fixed on different side walls of the outer cavity.

[0010] Furthermore, the central cavity is circular and the outer cavity is fan-shaped.

[0011] As a preferred solution of this solution, the central support body is provided with a positioning groove on the outer side wall of the outer cavity, and the auxiliary positioning strip is fixedly connected with a positioning protrusion, and the positioning protrusion is inserted into the positioning groove.

[0012] As a preferred embodiment of this solution, the outer conductor includes a central conductor, an insulating layer arranged outside the central conductor, a shielding layer arranged outside the insulating layer, a waterproof layer arranged outside the shielding layer, and an inner sheath arranged outside the waterproof layer.

[0013] As a preferred embodiment of this solution, N is 3 or 4.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Through the synergistic effect of the cold cavity inside the central support body and the cold cavity outside the auxiliary positioning bar, dual internal and external liquid cooling channels are constructed to form an all-round heat conduction network, significantly improving the heat extraction efficiency under high current conditions and effectively avoiding temperature accumulation in the cable core area;

[0016] 2. The arc-shaped groove and the fan-shaped auxiliary positioning strip form a composite positioning structure. The former provides radial basic positioning, and the latter achieves secondary constraint by embedding in the gap of the outer conductor, improving long-term reliability.

[0017] 3. The auxiliary positioning bar integrates the outer cooling cavity and the mounting hole. The inner cooling cavity adopts a combination of a central cavity and a fan-shaped outer cavity. A double support bar group is set in the outer cavity to form an elastic buffer to improve the overall structural strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 3 is a schematic cross-sectional structural diagram of the outer conductor of the present invention;

[0021] In the accompanying drawings, 1. Central support body; 11. Inner cold cavity; 111. Outer cavity; 1111. Support convex; 112. Central cavity; 12. Arc groove; 13. Positioning groove; 2. Outer conductor; 21. Central conductor; 22. Insulation layer; 23. Shielding layer; 24. Waterproof layer; 3. Auxiliary positioning strip; 31. Outer cold cavity; 32. Mounting hole; 33. Positioning convex; 4. Signal line; 5. Thermal conductive layer; 6. Wrapping layer; 7. Outer sheath. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings of the present invention. The directional words mentioned in the following embodiments, such as "up", "down", "left" and "right", etc., are only referenced to the directions of the accompanying drawings. Therefore, the directional words used are used to illustrate rather than limit the invention.

[0023] like Figure 1-3 As shown, a heat dissipation cable for new energy charging includes a heat conducting layer 5, a central support body 1 and three outer conductors 2. A wrapping layer 6 is provided on the outside of the heat conducting layer 5, and an outer sheath 7 is provided on the outside of the wrapping layer 6. An inner cold cavity 11 for accommodating cooling liquid is provided inside the central support body 1. Three arc-shaped grooves 12 for supporting and positioning the outer conductors 2 are provided at equal intervals in the circumferential direction on the outside of the central support body 1; three auxiliary positioning strips 3 are provided on the outside of the central support body 1 at equal intervals in the circumferential direction. The auxiliary positioning strips 3 are embedded in the gap between two adjacent outer conductors 2. The cross section of the auxiliary positioning strip 3 is fan-shaped. The two side covers of the auxiliary positioning strip 3 are provided on the outer conductor 2, and the outer side walls of the auxiliary positioning strip 3 abut against the inner side walls of the heat conducting layer 5.

[0024] Its compact structure provides stable support through the inner central support body 1. The inner cold cavity 11 on the central support body 1 allows for liquid cooling, dissipating heat from the outer conductor 2 to prevent heat accumulation inside. Simultaneously, the outer side of the outer conductor 2 can release the internal heat to the outside through the thermal conductive layer 5, thereby greatly improving the heat dissipation effect of the outer conductor 2 and providing a good working environment for the cable core. Its circumferentially uniform structure helps to homogenize the internal magnetic field. The arcuate grooves 12 and the auxiliary positioning bars 3 form a dual support system that limits the radial displacement of the outer conductor 2 and significantly reduces the risk of structural deformation under long-term bending conditions. Furthermore, the direct contact design between the thermal conductive layer 5 and the auxiliary positioning bars 3 reduces thermal resistance by 40%, significantly improving heat conduction efficiency.

[0025] Furthermore, an external cold cavity 31 for cooling the outside of the outer conductor 2 is provided inside the auxiliary positioning bar 3, and the external cold cavity 31 is symmetrically arranged about the auxiliary positioning bar 3, distributed at both ends of the auxiliary positioning bar 3, close to the outer conductor 2, and a spiral guide plate is also provided in the external cold cavity 31, with a guide angle of 15 to 20 degrees; the inner side of each outer conductor 2 shares the internal cold cavity 11 to achieve heat dissipation on the inner side, and at the same time, the outer side is dissipated through the two external cold cavities 31 respectively, thereby achieving all-round heat dissipation and further improving the heat dissipation effect.

[0026] Specifically, the auxiliary positioning strip 3 is integrally injection-molded from elastic thermally conductive silicone, and a mounting hole 32 for installing the signal line 4 is provided in the middle thereof. The mounting hole 32 is in a convex crescent shape and can be deformed by extrusion to provide a larger installation space for the signal line 4. After the mortgage is withdrawn, it automatically resets and squeezes the signal line 4 to improve its stability. At the same time, it can expand the compatible diameter range and improve the adaptability of the cable to different signal lines 4.

[0027] Specifically, the inner cold cavity 11 includes a central cavity 112 and three outer cavities 111 circumferentially equidistantly arranged outside the central cavity 112. The central cavity 112 is circular and the outer cavities 111 are fan-shaped. A support bar group is provided on the inner side wall of the outer cavity 111. The support bar group includes two support protrusions 1111 that are fixed on different side walls of the outer cavity 111 and are oppositely and spaced apart. In this embodiment, two groups of support bar groups are provided in each outer cavity 111. The gaps between the support bar groups can serve to connect the outer cavity 111 and the central cavity 112. At the same time, when subjected to strong squeezing, the support protrusions 1111 can abut against each other to form hard contact, thereby greatly improving the compressive strength of the structure and improving its service life. The gap design of the support bar group forms an elastic buffer chamber, which can absorb axial impact energy. The measured impact resistance is improved by 3 times, and the fan-shaped outer cavity 111 structure increases the coolant contact area by 50%. Combined with the hard contact mechanism of the support protrusion 1111, it can improve the pressure resistance, ensure the sealing of the pipeline, and effectively reduce the risk of coolant leakage.

[0028] Specifically, the central support body 1 is provided with a positioning groove 13 on the outer side wall of the outer cavity 111, and the auxiliary positioning strip 3 is fixedly connected with a positioning protrusion 33, which is inserted into the positioning groove 13 for easy assembly; the positioning protrusion 33 is specifically arranged in the middle of the auxiliary positioning strip 3 and is integrally formed. The auxiliary positioning strip 3 is a radially symmetrical structure as a whole, ensuring that the outer conductor 2 is evenly stressed.

[0029] Specifically, the outer conductor 2 includes a center conductor 21, an insulating layer 22 disposed outside the center conductor 21, a shielding layer 23 disposed outside the insulating layer 22, a waterproof layer 24 disposed outside the shielding layer 23, and an inner sheath disposed outside the waterproof layer 24. Specifically, the insulating layer 22 is made of cross-linked polyethylene with a temperature resistance rating of no less than 125 degrees Celsius; the shielding layer 23 is braided with aluminum-magnesium alloy wire with a coverage ratio of no less than 85%, and the waterproof layer 24 is coated with hot-melt adhesive.

[0030] Specifically, in order to ensure temperature resistance and tensile strength, the wrapping layer 6 is made of a double-layer mica tape and polyester fiber composite wrapping, and the outer sheath 7 is made of weather-resistant flame-retardant TPU material, which has good flame retardant properties and high temperature resistance; the coolant used in the inner cold cavity 11 and the outer cold cavity 31 is an ethylene glycol-based insulating solution, and at the same time, nanofluid particles that can improve thermal conductivity are added to the solution to enhance the liquid cooling heat dissipation efficiency, and can fully utilize the low freezing point and high boiling point characteristics of the ethylene glycol-based insulating solution to ensure that the cooling system continues to operate safely in extreme temperature difference environments.

Claims

1. A heat dissipation cable for new energy charging, characterized in that: The invention comprises a heat-conducting layer (5), a central support body (1) and N outer conductors (2), N≥3; a wrapping layer (6) is provided on the outer side of the heat-conducting layer (5), an outer sheath (7) is provided on the outer side of the wrapping layer (6), an inner cold cavity (11) for accommodating cooling liquid is provided inside the central support body (1), and N arc-shaped grooves (12) for supporting and positioning the outer conductors (2) are provided on the outer side of the central support body (1); N auxiliary positioning strips (3) are provided on the outer side of the central support body (1), the auxiliary positioning strips (3) are embedded in the gap between two adjacent outer conductors (2), the cross section of the auxiliary positioning strips (3) is fan-shaped, the two side covers of the auxiliary positioning strips (3) are provided on the outer conductors (2), and the outer side walls of the auxiliary positioning strips (3) are in contact with the inner side walls of the heat-conducting layer (5).

2. The heat dissipation cable for new energy charging according to claim 1, characterized in that: An external cold cavity (31) for cooling the outside of the outer conductor (2) is provided inside the auxiliary positioning strip (3).

3. The heat dissipation cable for new energy charging according to claim 2, characterized in that: The outer cold cavity (31) is arranged symmetrically with respect to the auxiliary positioning strip (3).

4. The heat dissipation cable for new energy charging according to claim 1, characterized in that: A mounting hole (32) for mounting a signal line (4) is provided in the middle of the auxiliary positioning strip (3).

5. The heat dissipation cable for new energy charging according to claim 4, characterized in that: The hole shape of the mounting hole (32) is elliptical, crescent-shaped, isosceles trapezoidal or fan-shaped.

6. The heat dissipation cable for new energy charging according to claim 1, characterized in that: The inner cold cavity (11) comprises a central cavity (112) and N outer cavities (111) circumferentially arranged at equal intervals outside the central cavity (112); a support bar group is arranged on the inner side wall of the outer cavity (111); the support bar group comprises two supporting protrusions (1111) that are opposite to and fixed on different side walls of the outer cavity (111).

7. The heat dissipation cable for new energy charging according to claim 6, characterized in that: The central cavity (112) is circular, and the outer cavity (111) is fan-shaped.

8. The heat dissipation cable for new energy charging according to claim 6, characterized in that: The central support body (1) is provided with a positioning groove (13) on the outer side wall of the outer cavity (111); a positioning protrusion (33) is fixedly connected to the auxiliary positioning strip (3); and the positioning protrusion (33) is inserted into the positioning groove (13).

9. The heat dissipation cable for new energy charging according to claim 1, characterized in that: The outer conductor (2) comprises a central conductor (21), an insulating layer (22) arranged outside the central conductor (21), a shielding layer (23) arranged outside the insulating layer (22), a waterproof layer (24) arranged outside the shielding layer (23), and an inner sheath arranged outside the waterproof layer (24).

10. The heat dissipation cable for new energy charging according to claim 1, characterized in that: N is 3 or 4.

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