Dragging-resistant and rolling-resistant cable for electric vehicle charging pile

Abstract

The invention provides a dragging-resistant and rolling-resistant cable for an electric vehicle charging pile. The dragging-resistant and rolling-resistant cable comprises a main cable layer, an isolation layer, a first protection layer, a glass fiber layer, a second protection layer and an outer sheath layer, the main cable layer comprises a plurality of wire cores and a cooling pipe, a liquid cooling agent is arranged in the cooling pipe, the plurality of wire cores wrap the cooling pipe, and the isolation layer, the first protection layer, the glass fiber layer, the second protection layer and the outer sheath layer are sequentially arranged outside the main cable layer; the first protection layer is made of thermoplastic polyurethane materials, a plurality of protrusions are arranged on the outer side of the first protection layer, the second protection layer is made of polyolefin elastomer materials, and a plurality of grooves are formed in the positions, corresponding to the protrusions, of the inner side of the second protection layer. Through the first protection layer and the second protection layer, certain strength of the surface of the cable can be ensured after long-time illumination dragging and rolling, and through the arrangement of the cooling pipe, the internal heat dissipation effect of the cable is ensured.

Description

Technical Field

[0001] The present application relates to the field of charging pile cables, and in particular to a cable for electric vehicle charging piles that is resistant to dragging and crushing. Background Art

[0002] With the development of the tram industry, trams have gradually become a means of transportation for many people. Trams need to be equipped with charging piles for charging. More and more charging piles are needed in various parking lots. The charging piles are generally located outdoors without full or no shielding. The charging piles are often exposed to the sun. The cables used in the charging piles will also be exposed to ultraviolet rays and rain erosion for a long time, causing the surface to weaken and the service life to be limited. At the same time, dragging and crushing will occur during use. After a lot of friction and crushing, the protective layer on the surface of the cable is easily worn, and the internal structure of the cable is easily damaged, which may lead to accidents during charging. Frequent inspection and replacement are required, and the cost is high. If ordinary cables only thicken the protective layer structure, it may also cause the internal cable temperature to be too high and the external structure to be too thick to dissipate heat, thereby posing a safety hazard and causing danger. Summary of the invention

[0003] In view of the above problems, the present application is proposed to provide a cable for an electric vehicle charging pile that is drag-resistant and crush-resistant, which overcomes the above problems or at least partially solves the above problems, including:

[0004] A cable for an electric vehicle charging pile that is drag-resistant and crush-resistant, comprising a main cable layer, an isolation layer, a first protective layer, a glass fiber layer, a second protective layer and an outer sheath layer;

[0005] The main cable layer includes a plurality of wire cores and a cooling tube, wherein a liquid coolant is arranged in the cooling tube, and the plurality of wire cores wrap the cooling tube, and the isolation layer, the first protective layer, the glass fiber layer, the second protective layer and the outer sheath layer are sequentially arranged outside the main cable layer;

[0006] The first protective layer is made of thermoplastic polyurethane material, and a plurality of protrusions are provided on the outer side of the first protective layer. The second protective layer is made of polyolefin elastomer material, and a plurality of grooves are provided on the inner side of the second protective layer corresponding to the positions of the protrusions. The protrusions and the grooves are embedded in each other, and the protrusions and the grooves are used to fix the relative positions of the first protective layer and the second protective layer.

[0007] Furthermore, the cores include a control core, a power core, a communication core, a ground core and an auxiliary core;

[0008] The control wire core comprises a control wire core body, a control wire core insulation layer, a control wire core armor layer, a control wire core water blocking layer and a control wire core reinforcement layer which are stacked in sequence.

[0009] Furthermore, the power line core comprises a power line core body, a power line core insulation layer, a power line core armor layer, a power line core water-blocking layer, a braided reinforcing fiber layer and an outer sheath which are stacked in sequence.

[0010] Furthermore, the communication wire core comprises a communication wire core body and a communication wire core insulation layer wrapped around the outside of the communication wire core body; the communication wire core insulation layer is composited by polyolefin and thermal conductive silicone.

[0011] Furthermore, the auxiliary wire core includes an auxiliary wire core body and an auxiliary wire core insulation layer wrapped around the outside of the auxiliary wire core body.

[0012] Furthermore, reinforcing ribs are provided on the outside of the outer sheath layer.

[0013] Furthermore, the outer sheath layer is composited by polyvinyl chloride resin, ultraviolet absorber and light stabilizer.

[0014] Furthermore, the outer sheath layer has a thickness of 1-5 mm.

[0015] Furthermore, the isolation layer is made of polyethylene or polyvinyl chloride, and the thickness of the isolation layer is 0.3-1 mm.

[0016] Furthermore, the interior of the main cable layer is filled with propylene material.

[0017] This application has the following advantages:

[0018] In the embodiments of the present application, compared with the prior art in which the cables for charging piles are easily corroded by sunlight and rain, and dragging and friction may cause quality problems in the cables and affect normal use, the present application provides a solution for heat dissipation through a double protective layer in cooperation with a cooling tube, specifically: comprising a main cable layer, an isolation layer, a first protective layer, a glass fiber layer, a second protective layer and an outer sheath layer; the main cable layer comprises a plurality of wire cores and a cooling tube, the cooling tube is provided with a liquid coolant, a plurality of the wire cores wrap the cooling tube, and the isolation layer, the first protective layer, the glass fiber layer, the second protective layer and the outer sheath layer are sequentially arranged outside the main cable layer; the first protective layer is made of thermoplastic polyurethane material, a plurality of protrusions are arranged on the outer side of the first protective layer, the second protective layer is made of polyolefin elastomer material, a plurality of grooves are arranged on the inner side of the second protective layer corresponding to the positions of the plurality of protrusions, the protrusions and the grooves are embedded in each other, and the protrusions and the grooves are used to fix the relative positions of the first protective layer and the second protective layer. The first protective layer and the second protective layer ensure that the cable surface can maintain a certain strength even after being dragged and rolled for a long time. The protrusions and grooves set on the first protective layer and the second protective layer can also prevent the two from relative displacement, thereby ensuring the stability between the two. At the same time, cooling pipes are also provided between the wire cores to ensure that when the protective layer has a certain thickness, the internal wire core can still maintain a certain heat dissipation effect, thereby reducing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the description of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 This is a schematic diagram of the structure of a cable for an electric vehicle charging pile that is resistant to dragging and rolling, provided in one embodiment of the present application;

[0021] Description of reference numerals:

[0022] 101. Main cable layer; 102. Isolation layer; 103. First protective layer; 104. Glass fiber layer; 105. Second protective layer; 106. Outer sheath layer; 107. Control core; 108. Power core; 109. Communication core; 110. Ground core; 111. Auxiliary core; 112. Cooling tube. DETAILED DESCRIPTION

[0023] In order to make the objects, features and advantages of the present application more obvious and understandable, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0024] The inventors analyzed the prior art and found that the existing cables for charging piles are all protected by a single protective layer on the inside of the cable, but the protection effect is weak. After being dragged and crushed for a long time, the outside of the cable is easily damaged, which makes the cable unusable or causes safety problems.

[0025] Reference Figure 1 , shows a schematic diagram of the structure of a cable for an electric vehicle charging pile that is drag-resistant and crush-resistant, provided in one embodiment of the present application, which may specifically include:

[0026] Main cable layer 101, isolation layer 102, first protective layer 103, glass fiber layer 104, second protective layer 105 and outer sheath layer 106;

[0027] The main cable layer 101 includes a plurality of wire cores and a cooling tube 112, wherein the cooling tube 112 is provided with a liquid coolant, and the plurality of wire cores wrap the cooling tube 112, and the isolation layer 102, the first protective layer 103, the glass fiber layer 104, the second protective layer 105 and the outer sheath layer 106 are sequentially arranged outside the main cable layer 101;

[0028] The first protective layer 103 is made of thermoplastic polyurethane material, and a plurality of protrusions are provided on the outer side of the first protective layer 103. The second protective layer 105 is made of polyolefin elastomer material, and a plurality of grooves are provided on the inner side of the second protective layer 105 corresponding to the positions of the protrusions. The protrusions and the grooves are embedded in each other, and the protrusions and the grooves are used to fix the relative positions of the first protective layer 103 and the second protective layer 105.

[0029] It should be noted that the isolation layer 102 , the first protective layer 103 , the glass fiber layer 104 , the second protective layer 105 and the outer sheath layer 106 which are sequentially arranged outside the main cable layer 101 are wrapped in sequence.

[0030] The grooves and protrusions arranged between the first protective layer 103 and the second protective layer can be embedded in each other to prevent the two from being displaced, which would cause the internal protective layers to rub against each other and damage the internal structure. At the same time, the glass fiber layer 104 further enhances the strength of the two protective layers and fills the gap between the first protective layer 103 and the second protective layer 105 to ensure that the two are in close contact without shaking. The first protective layer 103 is made of thermoplastic polyurethane (TPU) to ensure the wear resistance of the cable, improve the strength, toughness and fatigue resistance of the cable, and prevent dragging and rolling from causing greater damage to the cable. The second protective layer 105 is made of polyolefin elastomer (TPO), which has a small specific gravity, is cold and heat resistant, has good acid and alkali resistance, weather resistance, ozone resistance, and electrical insulation. It is easy to process and can reduce the impact of environmental factors on the cable.

[0031] The first protective layer 103 and the second protective layer 105 can both be made of a tube body with a preset thickness extruded, coated with a front material and shaped by a mold, and then rapidly cooled by liquid nitrogen to cool and shape the protective layer. The preparation process is simple and easy to produce.

[0032] The glass fiber layer 104 is used as a filler to improve the flexibility between the first protective layer 103 and the second protective layer 105, so as to improve the compression resistance of the two when they are rolled.

[0033] In the embodiments of the present application, compared with the prior art in which the cables for charging piles are easily damaged by sunlight and rain, and dragging and friction may cause quality problems in the cables and affect normal use, the present application provides a solution for heat dissipation through a double protective layer in combination with a cooling pipe, specifically comprising: a main cable layer 101, an isolation layer 102, a first protective layer 103, a glass fiber layer 104, a second protective layer 105 and an outer sheath layer 106; the main cable layer 101 comprises a plurality of wire cores and a cooling pipe 112, wherein the cooling pipe 112 is provided with a liquid coolant, and the plurality of wire cores wrap the cooling pipe 112, and the main cable layer 1 01, the isolation layer 102, the first protective layer 103, the glass fiber layer 104, the second protective layer 105 and the outer sheath layer 106 are wrapped in sequence; the first protective layer 103 is made of thermoplastic polyurethane material, and a number of protrusions are arranged on the outside of the first protective layer 103; the second protective layer 105 is made of polyolefin elastomer material, and a number of grooves are arranged on the inside of the second protective layer 105 corresponding to the positions of the protrusions, and the protrusions and the grooves are embedded in each other, and the protrusions and the grooves are used to fix the relative positions of the first protective layer 103 and the second protective layer 105. The first protective layer 103 and the second protective layer 105 solve the problem of ensuring a certain strength of the cable surface after long-term dragging and rolling, and ensure the service life; at the same time, a cooling pipe is also arranged between the cores to ensure that when the protective layer has a certain thickness, the internal core can still maintain a certain heat dissipation effect and will not cause safety hazards.

[0034] Next, a cable for an electric vehicle charging pile that is resistant to dragging and crushing in this exemplary embodiment will be further described.

[0035] In one embodiment of the present application, the cores include a control core 107 , a power core 108 , a communication core 109 , a ground core 110 , and an auxiliary core 111 ;

[0036] The control wire core 107 includes a control wire core body, a control wire core insulation layer, a control wire core armor layer, a control wire core water-blocking layer and a control wire core reinforcement layer which are stacked in sequence.

[0037] It should be noted that the core includes several cores with different functions. Different cores can be coated with different coating layers according to the heating state, core thickness and core material during use to ensure the stability of the cable. The control core needs to be wrapped with an insulating layer, an armor layer, a water-blocking layer and a reinforcement layer. The control core insulation layer plays a role of coating the cable core group 1 to isolate the inside and outside of the core to ensure the safety of its use to a certain extent. It can be formed by wrapping around the core with a light non-woven fabric. The wrapping thickness needs to ensure that the thickness is not too thick while ensuring the strength, and the core wire can be well coated and not damaged. The control core armor layer, the control core water-blocking layer and the control core reinforcement layer protect the core from mechanical damage and chemical corrosion and enhance the mechanical strength of the core on the outer layer of the control core 107. The control core armor layer is made of soft PVC extrusion, thereby ensuring the softness of the core while enhancing its mechanical strength. The control wire core water-blocking layer is formed by wrapping a water-blocking tape to ensure that the control wire core will not be corroded by liquid. The control wire core reinforcement layer is formed by extruding nano-nylon to improve the tensile and abrasion resistance of the charging pile cable and improve the life and stability of the control wire core.

[0038] In one embodiment of the present application, the power core 108 includes a power core body, a power core insulation layer, a power core armor layer, a power core water-blocking layer, a braided reinforcing fiber layer and an outer sheath which are stacked in sequence.

[0039] It should be noted that the power line core is conventionally set to 2 or more, and the power line core insulation layer is formed by wrapping the mineral insulation mica tape material around the line core. By adopting the mineral insulation mica tape, it has excellent high temperature resistance and combustion resistance, thereby ensuring the normal operation of the power line core; the power line core armor layer is woven from fine steel wires and wrapped on the outside of the insulation layer to enhance the strength and bending resistance of the power line core. The power line core water-blocking layer is wrapped by winding a water-blocking tape to ensure that the power line core will not be corroded by liquids. The braided reinforcement fiber layer is wrapped by nanofiber braided cloth to enhance the bending and drag resistance of the power line core, and reduce the wrapping thickness of the power line core to ensure the heat dissipation performance of the power line core. The outer sheath is extruded by soft PVC, thereby ensuring the softness of the line core while ensuring the strength of the power line core and providing overall protection for the internal line core mechanism.

[0040] In one embodiment of the present application, the communication wire core 109 includes a communication wire core body and a communication wire core insulation layer wrapped around the outside of the communication wire core body; the communication wire core insulation layer is composited by polyolefin and thermal conductive silicone.

[0041] It should be noted that the communication core body includes a twisted pair signal line and a control line. The communication core is used to transmit communication signals inside the cable. It adopts an insulation layer composited with polyolefin and thermal conductive silicone. While ensuring the thermal conductivity and insulation performance, it also increases the strength of the insulation layer. It combines the advantages of both polyolefin and thermal conductive silicone and makes up for the disadvantage of low hardness of thermal conductive silicone, thereby enhancing the insulation and heat dissipation performance of the core.

[0042] In one embodiment of the present application, the auxiliary wire core includes an auxiliary wire core body and an auxiliary wire core insulation layer wrapped around the outside of the auxiliary wire core body.

[0043] It should be noted that multiple auxiliary cores can be provided, and the auxiliary core insulation layer can be made of a composite of polyolefin and thermal conductive silicone. While ensuring the thermal conductivity and insulation properties, the strength of the insulation layer is also increased, combining the advantages of polyolefin and thermal conductive silicone and making up for the disadvantage of the low hardness of thermal conductive silicone, thereby enhancing the insulation and heat dissipation properties of the core.

[0044] In one embodiment of the present application, reinforcing ribs are provided on the outer side of the outer sheath layer.

[0045] It should be noted that the reinforcing ribs can be integrally formed with the outer sheath layer, or can be installed separately according to actual applications. The material can be a composite of a resin matrix with glass fiber and basalt fiber. The reinforcing rib protrusions are arranged on the surface of the outer sheath layer to reduce the contact friction between the outer sheath layer and the ground and other surfaces, so as to extend the service life of the outer sheath layer.

[0046] In one embodiment of the present application, the outer sheath layer is composited by polyvinyl chloride resin, ultraviolet absorber and light stabilizer.

[0047] It should be noted that the composition ratio of the outer sheath layer is polyvinyl chloride resin: ultraviolet absorber: light stabilizer = 98:1:1. The ultraviolet absorber and the light stabilizer are used to reduce the erosion of sunlight ultraviolet rays to the cable. According to actual application conditions, the proportion of the polyvinyl chloride resin can be reduced, and matte modifiers, oil-resistant modifiers, heat stabilizers, etc. can be added to improve the refractive index, oil resistance and thermal stability of the outer sheath layer. The addition ratio of the matte modifier, the oil-resistant modifier and the heat stabilizer shall not exceed 10%.

[0048] In one embodiment of the present application, the thickness of the outer sheath layer is 1-5 mm.

[0049] In one embodiment of the present application, the isolation layer is made of polyethylene or polyvinyl chloride, and the thickness of the isolation layer is 0.3-1 mm.

[0050] In one embodiment of the present application, the interior of the main cable layer is filled with propylene material.

[0051] It should be noted that the interior of the main cable layer is filled with propylene material to ensure that there is no gap inside the main cable and to improve the strength of the cable.

[0052] In a specific implementation, the main cable layer includes a control core, a ground core, a communication core, 2 power cores and 3 auxiliary cores. The isolation layer is made of polyvinyl chloride, the thickness of the isolation layer is 0.5mm, the thickness of the first protective layer is 2mm, the thickness of the glass fiber layer is 0.3mm, the thickness of the second protective layer is 2mm, and the thickness of the outer sheath layer is 2mm.

[0053] The cable samples were tested:

[0054] When the sample is connected to the test device under normal conditions (25°C, 23% RH), power can be transmitted normally;

[0055] Apply pressure to the sample, the applied pressure F, and calculate according to the following formula:

[0056]

[0057] Where k is the coefficient specified in the relevant cable product standards, δ is the average value of the sample insulation thickness, and D is the average value of the sample outer diameter;

[0058] After applying pressure for measurement, there is no obvious indentation on the sample surface. When the sample is connected to the test device, it can transmit electricity normally. The internal structure is intact and there is no relative displacement of the internal cable structure.

[0059] The sample was heated up and placed in a 70°C environment for 6 hours. There was no obvious change on the sample surface. The sample was connected to the test device and could transmit power normally. In a 70°C environment, the sample was connected to the test device and charged for 6 hours. The sample transmitted power normally without fluctuations.

[0060] The sample cable was dragged on the surface of 32-grit sandpaper. The surface effect of the sample is shown in Table 1.

[0061]

[0062] Table 1

[0063] Apply pressure F and drag the sample cable on the surface of 32-grit sandpaper. The surface effect of the sample is shown in Table 2.

[0064]

[0065] Table 2

[0066] After the measurement, the sample was connected to the test device and was able to transmit electricity normally. The internal structure was intact and there was no relative displacement in the internal cable structure.

[0067] Through the above tests, it can be known that the drag-resistant and crush-resistant cable for electric vehicle charging piles proposed in this application has high strength, can work normally in relatively harsh environments, is less affected by temperature and pressure, can be exposed to sunlight for a long time, has little impact on the cable due to dragging, has a stable internal structure, and has a long service life, which can increase the service life of the cable.

[0068] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0069] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0070] The above is a detailed introduction to a cable for electric vehicle charging piles that is resistant to dragging and crushing provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A cable for electric vehicle charging pile that is drag-resistant and crush-resistant, characterized in that: It includes a main cable layer, an isolation layer, a first protective layer, a glass fiber layer, a second protective layer and an outer sheath layer; The main cable layer includes a plurality of wire cores and a cooling tube, wherein a liquid coolant is arranged in the cooling tube, and the plurality of wire cores wrap the cooling tube, and the isolation layer, the first protective layer, the glass fiber layer, the second protective layer and the outer sheath layer are sequentially arranged outside the main cable layer; The first protective layer is made of thermoplastic polyurethane material, and a plurality of protrusions are provided on the outer side of the first protective layer. The second protective layer is made of polyolefin elastomer material, and a plurality of grooves are provided on the inner side of the second protective layer corresponding to the positions of the protrusions. The protrusions and the grooves are embedded in each other, and the protrusions and the grooves are used to fix the relative positions of the first protective layer and the second protective layer.

2. The cable according to claim 1, characterized in that The wire cores include a control wire core, a power wire core, a communication wire core, a grounding wire core and an auxiliary wire core; The control wire core comprises a control wire core body, a control wire core insulation layer, a control wire core armor layer, a control wire core water blocking layer and a control wire core reinforcement layer which are stacked in sequence.

3. The cable according to claim 2, characterized in that The power line core comprises a power line core body, a power line core insulation layer, a power line core armor layer, a power line core water-blocking layer, a braided reinforcement fiber layer and an outer protective layer which are stacked in sequence.

4. The cable according to claim 2, characterized in that The communication wire core comprises a communication wire core body and a communication wire core insulation layer wrapped around the outside of the communication wire core body; the communication wire core insulation layer is compounded by polyolefin and thermal conductive silicone.

5. The cable according to claim 2, characterized in that The auxiliary wire core comprises an auxiliary wire core body and an auxiliary wire core insulation layer wrapped around the outside of the auxiliary wire core body.

6. The cable according to claim 1, characterized in that The outer side of the outer sheath layer is provided with reinforcing ribs.

7. The cable according to claim 1, characterized in that The outer sheath layer is compounded from polyvinyl chloride resin, ultraviolet absorber and light stabilizer.

8. The cable according to claim 1, characterized in that The thickness of the outer sheath layer is 1-5 mm.

9. The cable according to claim 1, characterized in that The isolation layer is made of polyethylene or polyvinyl chloride, and the thickness of the isolation layer is 0.3-1 mm.

10. The cable according to claim 1, characterized in that The interior of the main cable layer is filled with propylene material.

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