Liquid cooling cable and charging pile

Abstract

The invention discloses a liquid cooling cable and a charging pile, and relates to the technical field of cables. The liquid cooling cable comprises an outer sheath, a cooling pipe and a plurality of wires, wherein the cooling pipe comprises a liquid inlet pipeline and a liquid outlet pipeline; the inner part of the outer sheath comprises a central area and a peripheral area surrounding the central area; the liquid inlet pipeline and the liquid outlet pipeline are arranged in the central area; the wires are arranged in the peripheral area. Through the structural design of the liquid-cooled cable, the heat dissipation capability of the liquid-cooled cable can be improved.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to a liquid-cooled cable and a charging pile. Background Art

[0002] In recent years, the rapid development of electric vehicles has made the charging time of electric vehicles more and more concerned by consumers. Consumers increasingly hope that the charging time of electric vehicles can be shortened, so the demand for high-power charging piles is also increasing.

[0003] High-power charging piles have more stringent requirements for heat dissipation, and liquid-cooled cables can better meet consumers' fast charging needs.

[0004] However, in the related art, the heat dissipation capability of the liquid cooling cable is poor. Summary of the invention

[0005] The main purpose of this application is to propose a liquid-cooled cable and a charging pile, aiming to improve the heat dissipation capacity of the liquid-cooled cable.

[0006] To achieve the above-mentioned object, in a first aspect, the present application provides a liquid cooling cable, the liquid cooling cable comprising: an outer sheath, a cooling pipe and a plurality of wires, the cooling pipe comprising a liquid inlet pipe and a liquid outlet pipe;

[0007] The outer sheath interior includes a central area and a peripheral area surrounding the central area;

[0008] The liquid inlet pipe and the liquid outlet pipe are arranged in the central area;

[0009] Each of the conductive wires is disposed in the peripheral area.

[0010] In one embodiment, the plurality of wires include a positive wire and a negative wire, and the positive wire and the negative wire are arranged at intervals;

[0011] The first projection of the positive electrode wire toward the cooling tube covers a part of the outer surface of the liquid inlet pipe and a part of the outer surface of the liquid outlet pipe respectively;

[0012] The second projection of the negative electrode wire onto the cooling tube covers a portion of the outer surface of the liquid inlet pipe and a portion of the outer surface of the liquid outlet pipe respectively, wherein the coverage area of ​​the first projection does not overlap with the coverage area of ​​the second projection.

[0013] In one embodiment, the positive electrode wire and the negative electrode wire are symmetrically arranged.

[0014] In one embodiment, the plurality of wires further include: a plurality of signal wires, each of the signal wires is located between the positive electrode wire and the negative electrode wire, and is insulated from the positive electrode wire and the negative electrode wire.

[0015] In one embodiment, the peripheral area includes a first distribution space and a second distribution space located between the positive electrode wire and the negative electrode wire, part of the plurality of signal lines are located in the first distribution space, and the remaining part of the plurality of signal lines are located in the second distribution space.

[0016] In one embodiment, the liquid-cooled cable further comprises: a plurality of insulating columns, the plurality of insulating columns being distributed between the outer wall of the cooling tube and the inner wall of the outer jacket to separate the peripheral area into a plurality of areas;

[0017] The plurality of conductive lines are disposed in the plurality of regions, respectively.

[0018] In one embodiment, the plurality of wires include: a positive wire, a negative wire and a plurality of signal wires;

[0019] There are at least three insulating columns, which divide the peripheral area into at least three areas;

[0020] The positive electrode wire and the negative electrode wire are respectively arranged in the two areas, and the plurality of signal lines are arranged in at least one area.

[0021] In one embodiment, the cooling tube and the plurality of insulating columns are integrally formed.

[0022] In one embodiment, the liquid-cooled cable further comprises a heat-conducting layer, which is disposed on an outer wall of the cooling tube and contacts at least a portion of the plurality of wires.

[0023] In one embodiment, the plurality of wires include: a positive electrode wire and a negative electrode wire, and the heat conductive layer is in contact with the positive electrode wire and the negative electrode wire respectively.

[0024] In one embodiment, the cross-section of the cooling tube is circular, rectangular or "8"-shaped; the cross-sectional area of ​​the liquid inlet pipe is 0.8-1.2 times the cross-sectional area of ​​the liquid outlet pipe.

[0025] In one embodiment, the cross-section of the cooling tube is circular, rectangular or "8"-shaped; the cross-sectional area of ​​the liquid inlet pipe is 0.9-1.1 times the cross-sectional area of ​​the liquid outlet pipe.

[0026] In one embodiment, the outer surface of the liquid inlet pipe is not smaller than the outer surface of the liquid outlet pipe.

[0027] In one embodiment, the liquid inlet pipe and the liquid outlet pipe are symmetrically arranged, and the cross-sectional areas of the two are equal.

[0028] In a second aspect, the present application further provides a charging pile, comprising: a hydraulic pump and a liquid cooling cable as described in the first aspect, wherein the hydraulic pump is respectively connected to the liquid inlet pipe and the liquid outlet pipe to form a circulation loop.

[0029] The above-mentioned liquid-cooled cable and charging pile include an outer sheath, a cooling pipe and a plurality of wires. The cooling pipe includes a liquid inlet pipe and a liquid outlet pipe. By arranging the liquid inlet pipe and the liquid outlet pipe in the central area and arranging each wire in the peripheral area surrounding the central area, the space inside the outer sheath can be fully utilized, and the sheath and the cooling pipe can be fully utilized as an insulating structure to increase the effective cross-sectional space of each wire and the cooling pipe, so that the contact area between each wire and the cooling pipe is larger, which can effectively reduce the conduction thermal resistance from the cable to the cooling pipe, and improve the heat reduction efficiency of the cooling pipe for each wire, thereby improving the heat dissipation capacity of the liquid-cooled cable. In addition, the liquid-cooled cable adopts the above-mentioned structural design, which can make the area of ​​the liquid inlet of the liquid inlet pipe and the liquid outlet of the liquid outlet pipe larger, increase the flow cross-sectional area of ​​the liquid inlet pipe and the liquid outlet pipe, and increase the flow rate of the coolant under the same liquid drive device. Increasing the flow rate of the coolant can effectively reduce the temperature rise of the coolant caused by heat absorption along the pipeline, thereby improving the cooling effect and further improving the heat dissipation capacity of the liquid-cooled cable. Moreover, by increasing the flow cross-sectional area of ​​the liquid inlet pipe and the liquid outlet pipe, the performance requirements for the liquid drive device can be reduced under the same heat dissipation requirements. The larger flow cross-sectional area can also reduce the necking phenomenon of the cooling pipeline caused by external forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art 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 the structures shown in these drawings without paying any creative work.

[0031] Figure 1 This is a schematic diagram of the cross-sectional structure of a liquid cooling cable in one embodiment of the present application;

[0032] Figure 2 This is a schematic diagram of the cross-sectional structure of a liquid cooling cable in another embodiment of the present application;

[0033] Figure 3 This is a schematic diagram of the cross-sectional structure of a liquid cooling cable in yet another embodiment of the present application.

[0034] Description of Figure Numbers:

[0035] 1-outer sheath, 2-cooling tube, 21-liquid inlet pipe, 211-liquid inlet, 22-liquid outlet pipe, 221-liquid outlet, 3-wire, 31-positive wire, 32-negative wire, 33-signal wire, 4-insulating column, 5-heat conductive layer.

[0036] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0040] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0042] As described in the background technology, in recent years, the rapid development of electric vehicles has made the charging time of electric vehicles more and more concerned by consumers. Consumers increasingly hope that the charging time of electric vehicles can be shortened, so the demand for high-power charging piles is also increasing. High-power charging piles have more stringent requirements for heat dissipation, and liquid-cooled cables can better meet consumers' fast charging needs. However, in the related technology, the heat dissipation capacity of liquid-cooled cables is poor.

[0043] Based on this, Figure 1 As shown, the present application provides a liquid-cooled cable, which includes: an outer sheath 1, a cooling tube 2 and a plurality of wires 3.

[0044] The cooling pipe 2 includes a liquid inlet pipe 21 and a liquid outlet pipe 22. The outer sheath 1 includes a central area and a peripheral area surrounding the central area. The liquid inlet pipe 21 and the liquid outlet pipe 22 are arranged in the central area. Each conductor 3 is arranged in the peripheral area.

[0045] Among them, the outer sheath 1 is used to protect the entire liquid-cooled cable. The material of the outer sheath 1 may include one or more of polyvinyl chloride (PVC), thermoplastic elastomer (TPE), thermoplastic polyurethane elastomer (TPU), and rubber material. The shape of the outer sheath 1 can be set to be cylindrical. The liquid inlet pipe 21 and the liquid outlet pipe 22 can be made of flexible heat-conductive materials, such as cross-linked polyethylene (XLPE). The liquid inlet pipe 21 and the liquid outlet pipe 22 can also be made of other materials, such as silicone or polyurethane materials. Through the heat exchange between the wire 3 and the cooling pipe 2, the heat generated by the wire 3 is taken away, and the wire 3 is cooled. It should be noted that the specific materials of the outer sheath 1 and the cooling pipe 2 are not limited here, and the corresponding materials can be selected according to user needs in the application.

[0046] It should also be noted that the coolant in the present application can be water, or other types of liquids, such as a mixture of water and ethylene glycol. In practical applications, users can select a suitable type of coolant according to their needs.

[0047] It can be understood that the cross-sectional shape and area of ​​the liquid inlet pipe 21 and the liquid outlet pipe 22 can be set to be the same. By setting the liquid inlet pipe 21 and the liquid outlet pipe 22 in the central area and setting each wire 3 in the peripheral area, the internal space of the outer sheath 1 can be fully utilized, and the sheath and the cooling pipe 2 can be fully utilized as an insulating structure to increase the effective cross-sectional space of each wire 3 and the cooling pipe 2, so that the contact area between each wire 3 and the cooling pipe 2 is larger, which can effectively reduce the conduction thermal resistance from the cable to the cooling pipe 2 and improve the heat reduction efficiency of the cooling pipe 2 for each wire 3. On the basis of making full use of the internal space of the outer sheath 1, the area of ​​the liquid inlet 211 of the liquid inlet pipe 21 and the liquid outlet 221 of the liquid outlet pipe 22 can be made larger, so that the flow rate of the coolant can be increased, and the increase in flow rate can effectively reduce the temperature rise of the coolant caused by heat absorption along the pipeline, thereby improving the uniformity of cooling the conductor and improving the cooling capacity.

[0048] In applications, a hydraulic pump is often used to drive the coolant into the liquid inlet pipe 21. The coolant exchanges heat with each conductor 3 in the liquid inlet pipe 21 and the liquid outlet pipe 22. The heat of the conductor wire is transferred to the coolant through the liquid inlet pipe 21 or the liquid outlet pipe 22, thereby cooling the conductor 3. The heated coolant is output from the liquid outlet 221 of the liquid outlet pipe 22 to the external heat sink, where it exchanges heat with the outside world and is cooled. After the temperature is lowered, it is sent back to the liquid cooling channel to continue cooling the conductor wire, thereby circulating.

[0049] In the related art, common liquid cooling structures include multi-tube liquid cooling structure and copper-coated water structure. The multi-tube liquid cooling structure sets multiple liquid cooling tubes around or inside the conductor to form multiple cooling channels, but it has limitations such as large pressure drop, high requirements for pump performance, large thermal resistance from conductor to liquid, inlet and outlet water pipes need to appear in pairs, and complex structure. The copper-coated water structure adopts a concentric symmetrical dispersed structure. Although the thermal resistance from conductor to liquid cooling is smaller than that of the multi-tube liquid cooling structure, the pressure drop is still large, the pump performance requirements are high, the inlet and outlet water pipes need to be diverted through a multi-pass structure, and the structure is also relatively complex.

[0050] In the scheme corresponding to the present embodiment, since the internal space of the outer sheath 1 is fully utilized, the area of ​​the liquid inlet 211 of the liquid inlet pipe 21 and the liquid outlet 221 of the liquid outlet pipe 22 can be increased relative to the related art, and the flow rate of the coolant can be increased without changing the hydraulic pump. Increasing the flow rate of the coolant can effectively reduce the temperature rise of the coolant caused by the heat absorption along the pipeline, improve the cooling effect, and further improve the heat dissipation capacity of the liquid cooling cable. Therefore, the structural design of the present embodiment can increase the flow cross-sectional area of ​​the liquid inlet pipe 21 and the liquid outlet pipe 22, and can increase the flow rate of the coolant under the same liquid drive device (such as the aforementioned hydraulic pump). Increasing the flow rate of the coolant can effectively reduce the temperature rise of the coolant caused by the heat absorption along the pipeline, thereby improving the cooling effect. On the other hand, under the same heat dissipation requirements, the performance requirements for the liquid drive device can be reduced, and the cost of the liquid drive device with relatively low performance is often lower, which is conducive to reducing the cost of the charging pile. In addition, the larger flow cross-section of the liquid inlet pipe 21 and the liquid outlet pipe 22 can also reduce the necking phenomenon of the cooling pipe 2 due to external forces. In summary, the larger cross-sectional area and optimized structural design of the liquid-cooled cable in the embodiment of the present application reduce flow losses, reduce dependence on the performance of the coolant drive device, improve reliability and economy, and extend the service life of the equipment.

[0051] The above-mentioned liquid-cooled cable and charging pile include an outer sheath 1, a cooling tube 2 and a plurality of wires 3. The cooling tube 2 includes a liquid inlet pipe 21 and a liquid outlet pipe 22. By arranging the liquid inlet pipe 21 and the liquid outlet pipe 22 in the central area and arranging each wire 3 in the peripheral area surrounding the central area, the space inside the outer sheath 1 can be fully utilized, and the sheath and the cooling tube 2 can be fully utilized as an insulating structure to increase the effective cross-sectional space of each wire 3 and the cooling tube 2, so that the contact area between each wire 3 and the cooling tube 2 is larger, which can effectively reduce the conduction thermal resistance from the cable to the cooling tube 2, and improve the heat reduction efficiency of the cooling tube 2 on each wire 3, thereby improving the heat dissipation capacity of the liquid-cooled cable. In addition, the liquid-cooled cable adopts the above-mentioned structural design, which can make the liquid inlet 211 of the liquid inlet pipe 21 and the liquid outlet 221 of the liquid outlet pipe 22 larger in area. Increasing the flow cross-sectional area of ​​the liquid inlet pipe 21 and the liquid outlet pipe 22 can increase the flow rate of the coolant under the same liquid drive device, and increasing the flow rate of the coolant can effectively reduce the temperature rise of the coolant caused by heat absorption along the pipeline, thereby improving the cooling effect and further improving the heat dissipation capacity of the liquid-cooled cable. Moreover, by increasing the flow cross-sectional area of ​​the liquid inlet pipe 21 and the liquid outlet pipe 22, the performance requirements for the liquid drive device can be reduced under the same heat dissipation requirements, and the larger flow cross-sectional area can also reduce the necking phenomenon of the cooling pipe 2 due to external forces.

[0052] In one embodiment, Figure 1As shown, the plurality of wires 3 include a positive wire 31 and a negative wire 32 , and the positive wire 31 and the negative wire 32 are arranged at intervals.

[0053] The first projection of the positive electrode wire 31 toward the cooling tube 2 covers part of the outer surface of the liquid inlet pipe 21 and part of the outer surface of the liquid outlet pipe 22. The second projection of the negative electrode wire 32 toward the cooling tube 2 covers part of the outer surface of the liquid inlet pipe 21 and part of the outer surface of the liquid outlet pipe 22, wherein the coverage area of ​​the first projection does not overlap with the coverage area of ​​the second projection.

[0054] The positive electrode wire 31 and the negative electrode wire 32 cooperate to form a complete charging circuit between the charging pile, the liquid cooling cable and the battery, so that the charging pile can charge the battery through the liquid cooling cable, thereby replenishing energy for the battery.

[0055] In use, the coolant continuously absorbs heat from the wire 3 as it flows along the pipeline, and its temperature continuously rises. Therefore, the temperatures of the coolant in the liquid inlet pipe 21 and the liquid outlet pipe 22 are different, and the temperature of the coolant in the liquid outlet pipe 22 is higher than the temperature of the coolant in the liquid inlet pipe 21.

[0056] In this embodiment, by making the first projection of the positive electrode wire 31 toward the cooling tube 2 cover part of the liquid inlet pipe 21 and part of the liquid outlet pipe 22 respectively, and making the second projection of the negative electrode wire 32 toward the cooling tube 2 cover part of the liquid inlet pipe 21 and part of the liquid outlet pipe 22 respectively, the positive electrode wire 31 can be heat exchanged with the liquid inlet pipe 21 and the liquid outlet pipe 22 respectively, and the negative electrode wire 32 can be heat exchanged with the liquid inlet pipe 21 and the liquid outlet pipe 22 respectively, so that the temperature difference between the positive electrode wire 31 and the negative electrode wire 32 is small, avoiding the problem of excessive temperature difference caused by one of the positive electrode wire 31 and the negative electrode wire 32 exchanging heat with the liquid inlet pipe 21 and the other exchanging heat with the liquid outlet pipe 22, thereby reducing the maximum temperature of the positive electrode wire 31 and the negative electrode wire 32, and avoiding excessively high local temperature of the liquid cooling cable, thereby improving the charging stability and safety of the liquid cooling cable.

[0057] In one embodiment, Figure 1 As shown, the positive electrode wire 31 and the negative electrode wire 32 are symmetrically arranged. The cross section of the positive electrode wire 31 and the cross section of the negative electrode wire 32 can be symmetrically arranged relative to the center point of the cross section of the outer sheath 1.

[0058] It can be understood that the positive wire 31 and the negative wire 32 are symmetrically arranged, and the cross-sectional shape and area of ​​the positive wire 31 and the negative wire 32 are the same. Therefore, the electrical parameters such as resistance and inductance of the positive wire 31 and the negative wire 32 are similar. According to Kirchhoff's law, in the same circuit, the current will be evenly distributed on the path with the same parameters. Therefore, the positive wire 31 and the negative wire 32 can achieve a more balanced current distribution, avoiding local overheating caused by uneven current distribution and affecting charging stability.

[0059] The positive wire 31 and the negative wire 32 are symmetrically arranged, and the area covered by the first projection and the area covered by the second projection can be the same, so that the heat exchange efficiency between the positive wire 31 and the negative wire 32 and the coolant is similar, and the temperature difference between the positive wire 31 and the negative wire 32 can be reduced. In addition, the coverage area of ​​the first projection on the liquid inlet pipe 21 and the coverage area of ​​the second projection on the liquid inlet pipe 21 can be similar, and the coverage area of ​​the first projection on the liquid outlet pipe 22 and the coverage area of ​​the second projection on the liquid outlet pipe 22 can be similar, so that the heat exchange efficiency between the positive wire 31 and the negative wire 32 and the liquid inlet pipe 21 is similar, and the heat exchange efficiency between the positive wire 31 and the negative wire 32 and the liquid outlet pipe 22 is similar, so as to further reduce the temperature difference between the positive wire 31 and the negative wire 32, and improve the charging stability and safety of the liquid cooling cable.

[0060] In one embodiment, Figure 1 As shown, the plurality of wires 3 further include: a plurality of signal wires 33 , each signal wire 33 is respectively located between the positive wire 31 and the negative wire 32 , and is respectively insulated from the positive wire 31 and the negative wire 32 .

[0061] Among them, the signal line 33 in the charging pile liquid cooling cable is used to transmit various control, monitoring and communication signals to ensure accurate and efficient interaction between the charging pile and the electric vehicle, such as the charging control signal line 33 and the communication signal.

[0062] It can be understood that there is a gap space between the positive wire 31 and the negative wire 32. Each signal line 33 is respectively arranged in the gap space between the positive wire 31 and the negative wire 32, which can further improve the space utilization inside the outer sheath 1, improve the compactness of the charging pile liquid cooling cable, and reduce the invalid space inside the outer sheath 1, so as to increase the flow cross-section of the liquid inlet pipe 21 and the liquid outlet pipe 22.

[0063] In one embodiment, Figure 1 As shown, the peripheral area includes a first distribution space and a second distribution space located between the positive wire 31 and the negative wire 32, a portion of the plurality of signal lines 33 is located in the first distribution space, and the remaining portion of the plurality of signal lines 33 is located in the second distribution space.

[0064] It can be understood that part of the plurality of signal lines 33 is located in the first distribution space, and the rest of the plurality of signal lines 33 is located in the second distribution space. Such a distribution method is helpful to reasonably arrange the signal lines 33 with different functions and avoid mutual interference between signals. Moreover, in one example, the first distribution space and the second distribution space can be symmetrically arranged. Since the first distribution space and the second distribution space are symmetrically arranged, the signal lines 33 can be regarded as symmetrically distributed. The symmetrical layout is conducive to uniform force on the entire cable and improves the mechanical properties and durability of the cable.

[0065] It should be noted that the charging pile liquid cooling cable may also include a ground wire, and the ground wire may also be arranged in the first distribution space and the second distribution space.

[0066] In one embodiment, Figure 1 As shown, the liquid cooling cable further includes: a plurality of insulating columns 4, which are distributed between the outer wall of the cooling tube 2 and the inner wall of the outer sheath 1, dividing the outer area into a plurality of areas. A plurality of conductors 3 are respectively arranged in the plurality of areas.

[0067] The insulating columns 4 may be arranged on the surface of the liquid inlet pipe 21 and the liquid outlet pipe 22 .

[0068] It can be understood that by arranging multiple wires 3 in multiple areas divided by multiple insulating columns 4, the wires 3 located in different areas can be insulated, thereby ensuring the electrical insulation performance between the lines and ensuring the safety and stability of the charging process. In addition, the insulating column 4 can provide mechanical support and fixation for each wire 3. During the use of the charging pile, the cable may be subjected to external forces such as stretching, bending, and vibration. The insulating column 4 can maintain each wire 3 in a relatively fixed position, prevent the insulation layer from being damaged due to friction and displacement between the wires 3, avoid signal interference or electrical performance degradation due to changes in the position of the wire 3, and extend the service life of the cable.

[0069] In one embodiment, the plurality of wires 3 include a positive wire 31 , a negative wire 32 and a plurality of signal wires 33 .

[0070] There are at least three insulating columns 4, which divide the peripheral area into at least three areas;

[0071] The positive electrode wire 31 and the negative electrode wire 32 are respectively disposed in two different areas, and a plurality of signal lines are disposed in at least one area.

[0072] The insulating column 4 can isolate different types of wires to prevent short circuits between wires of different types. Figure 1 and Figure 2 As shown, the insulating column 4 may be located between the signal line 33 and the positive electrode wire 31 , and between the signal line 33 and the negative electrode wire 32 .

[0073] It can be understood that the insulating column 4 is arranged between the signal line 33 and the positive wire 31, and between the signal line 33 and the negative wire 32, so that the signal line 33 and the positive wire 31 are insulated, and the signal line 33 and the negative wire 32 are insulated, thereby constructing an insulating barrier between the signal line 33 and the positive wire 31, and between the signal line 33 and the negative wire 32. When the charging pile is working, the positive and negative wires 32 carry high voltage currents. If they are in direct contact with the signal line 33 or too close to each other, they may cause current leakage, abnormal signal transmission, and even cause safety accidents such as short circuits. The insulating column 4 can effectively prevent this from happening, ensure the electrical insulation performance between the lines, and ensure the safety and stability of the charging process. In addition, the insulating column 4 provides mechanical support and fixing for the signal line 33, the positive wire 31 and the negative wire 32. During the use of the charging pile, the cable may be subjected to external forces such as stretching, bending, and vibration. The insulating column 4 can maintain each wire 3 in a relatively fixed position, prevent the insulation layer from being damaged due to friction and displacement between the wires 3, avoid signal interference or electrical performance degradation due to position changes of the wires 3, and extend the service life of the cable.

[0074] Corresponding to the aforementioned embodiment, the first distribution space and the second distribution space can be divided by the insulating column 4, so that the installation positions of the signal line 33, the positive electrode wire 31 and the negative electrode wire 32 can be determined by using the insulating column 4 as a mark.

[0075] In one embodiment, the cooling tube is integrally formed with the plurality of insulating columns.

[0076] It should be noted that the liquid inlet pipe 21 and the liquid outlet pipe 22 can be integrally formed, and on this basis, the liquid inlet pipe 21, the liquid outlet pipe 22 and each insulating column 4 can be integrally formed.

[0077] In this embodiment, the cooling tube and the plurality of insulating columns are integrally formed, which can optimize the structural performance of the liquid cooling cable and simplify the manufacturing process. At the same time, it can ensure that the two are closely combined and synergistically play an insulating role.

[0078] In one embodiment, Figure 2 As shown, the liquid-cooled cable further includes a heat-conducting layer 5 , which is disposed on the outer wall of the cooling tube 2 and contacts at least a portion of the plurality of wires 3 .

[0079] The heat-conducting layer 5 may be made of a heat-conducting material with a high thermal conductivity, such as thermal grease, graphite heat-conducting sheet, potting glue material, and other heat-conducting materials.

[0080] It is understandable that during the charging process, each wire 3 will generate a lot of heat when current passes through it. By arranging the heat-conducting layer 5 on the outer wall of the cooling tube so that the heat-conducting layer 5 is in contact with at least part of the wire 3, the heat generated by at least part of the wire 3 can be quickly transferred to the coolant in the cooling tube 2 through the heat-conducting layer 5, thereby accelerating the heat dissipation, preventing the cable temperature from being too high, and ensuring the efficient operation of the charging system.

[0081] In one embodiment, the plurality of wires 3 include a positive electrode wire 31 and a negative electrode wire 32 , and the heat conductive layer 5 is in contact with the positive electrode wire 31 and the negative electrode wire 32 , respectively.

[0082] The heat conducting layer 5 is located between the cooling tube 2 and the positive electrode wire 31, and between the cooling tube 2 and the negative electrode wire 32. The heat conducting layer 5 can be made of heat conducting materials with high thermal conductivity, such as heat conducting silicone grease, graphite heat conducting sheet, potting glue material and other heat conducting materials.

[0083] It can be understood that during the charging process, a large amount of heat will be generated when a large current passes through the positive wire 31 and the negative wire 32. By setting a heat-conducting layer 5 between the cooling tube 2 and the positive wire 31, and between the cooling tube 2 and the negative wire 32, the heat generated by the wire 3 can be quickly transferred to the coolant in the cooling tube 2 through the heat-conducting layer 5, thereby accelerating the heat dissipation, preventing the cable temperature from being too high, and ensuring the efficient operation of the charging system. Moreover, by setting the heat-conducting layer 5, the heat transfer between the cooling tube 2 and the positive and negative wires 32 can be made more uniform, avoiding local overheating. Since the heat generation of the positive and negative wires 32 may be different during charging, the heat-conducting layer 5 can evenly distribute the heat between the two, and then transfer it to the cooling tube 2, ensuring that the temperature of each part of the cable is within a reasonable range, and extending the service life of the cable and related components.

[0084] It should be noted that the heat conducting layer 5 may also be located between the cooling tube 2 and other wires 3 , for example, between the cooling tube 2 and the signal wire 33 .

[0085] In one embodiment, the cross-sectional area of ​​the liquid inlet pipe 21 is 0.8-1.2 times the cross-sectional area of ​​the liquid outlet pipe 22. Exemplarily, the cross-sectional area of ​​the liquid inlet pipe 21 may be 0.8, 0.9, 1, 1.1 or 1.2 times the cross-sectional area of ​​the liquid outlet pipe 22. It should be noted that the above examples do not constitute a limitation to this embodiment, and in application, the ratio of the cross-sectional area of ​​the liquid inlet pipe 21 to the cross-sectional area of ​​the liquid outlet pipe 22 may be any value in the range of 0.8-1.2.

[0086] It can be understood that by making the ratio of the cross-sectional area of ​​the liquid inlet pipe 21 and the liquid outlet pipe 22 in the range of 0.9 to 1.1, the flow rate of the coolant in the inlet and outlet water pipes can be close, so as to facilitate the balance of the flow rate of the coolant in the inlet and outlet water pipes and ensure the stable operation of the cooling system. In addition, when the cross-sectional area ratio of the liquid inlet pipe 21 and the liquid outlet pipe 22 is close to 1, the coolant flows more smoothly in the pipe system, reducing the pressure loss caused by factors such as sudden changes in the pipe cross section, reducing the workload of the cooling pump, extending the service life of the cooling pump, and also saving energy. The ratio within this range also helps to maintain the stability of the pressure in the pipe, avoid the impact on the pipe system due to excessive pressure fluctuations, reduce the risk of pipe rupture and leakage, and improve the reliability and safety of the liquid cooling system.

[0087] In another embodiment, the cross-section of the cooling tube 2 is circular, rectangular or "8" shaped; further, the cross-sectional area of ​​the liquid inlet pipe 21 is 0.9-1.1 times the cross-sectional area of ​​the liquid outlet pipe 22. Exemplarily, the cross-sectional area of ​​the liquid inlet pipe 21 can be 0.9, 0.95, 1 or 1.05, 1.1 times the cross-sectional area of ​​the liquid outlet pipe 22. It should be noted that the above examples do not constitute a limitation to this embodiment. In application, the ratio of the cross-sectional area of ​​the liquid inlet pipe 21 to the cross-sectional area of ​​the liquid outlet pipe 22 can be any value between 0.9 and 1.1.

[0088] In this embodiment, the cross-sectional area ratio of the liquid inlet pipe 21 and the liquid outlet pipe 22 is made closer to 1, thereby further improving the reliability and safety of the liquid cooling system.

[0089] In one embodiment, the outer surface of the liquid inlet pipe 21 is not smaller than the outer surface of the liquid outlet pipe 22 .

[0090] In application, the temperature of the coolant when it just flows into the inlet pipe 21 is lower than the temperature in the outlet pipe 22. For example, the temperature of the coolant when it just flows into the inlet pipe 21 may be 25°C, and the temperature rises to 28°C when it flows to the end of the inlet pipe 21; and the temperature reaches 35°C when it flows out of the outlet pipe 22.

[0091] Therefore, the cooling effect of the liquid inlet pipe 21 is greater, and the surface of the liquid inlet pipe 21 should be increased, while the surface of the liquid outlet pipe 22 should be reduced, especially when the cross-sectional areas of the two are the same (ie, the coolant flow rate).

[0092] In applications, cables can be used as Figure 3 In the structure shown, the cross section of the liquid outlet pipe 22 is set to be semicircular, and the cross section of the liquid inlet pipe 21 is set to be semi-elliptical, so that the surface area of ​​the liquid inlet pipe 21 is larger. And because the positive and negative wires are the main heat sources, most of the positive and negative wires are attached to the liquid inlet pipe 21, a small part is attached to the liquid outlet pipe 22, and the rest of the liquid outlet pipe 22 is close to the signal line.

[0093] In one embodiment, the liquid inlet pipe 21 and the liquid outlet pipe 22 are symmetrically arranged, and the cross-sectional areas of the two are equal.

[0094] Among them, Figure 1 As shown, the cross sections of the liquid inlet pipe and the liquid outlet pipe can be symmetrical and the same.

[0095] It can be understood that the cross-sectional areas of the liquid inlet pipe 21 and the liquid outlet pipe 22 are equal. This design can maintain the flow balance of the coolant in the inlet and outlet pipes, ensure the stable operation of the cooling system, and avoid local overheating or uneven cooling caused by flow differences.

[0096] In addition, if Figure 1 and Figure 2 When the cross-section of the cooling pipe is in the above-mentioned shape, the liquid inlet pipe 21 and the liquid outlet pipe 22 can fit tightly together, so that there is no gap between the liquid inlet pipe 21 and the liquid outlet pipe 22, which is beneficial to improve the heat conduction efficiency and reduce the temperature difference between the liquid inlet pipe 21 and the liquid outlet pipe 22.

[0097] It can be understood that, as described in the above-mentioned embodiment, the coolant continuously absorbs the heat of the wire 3 during the process of flowing along the pipeline, and the temperature continues to rise. Therefore, the temperature of the coolant in the liquid inlet pipe 21 and the liquid outlet pipe 22 will be different, and the temperature of the coolant in the liquid outlet pipe 22 is higher than the temperature of the coolant in the liquid inlet pipe 21. By closely fitting the liquid inlet pipe 21 and the liquid outlet pipe 22, heat conduction can be carried out between the liquid inlet pipe 21 and the liquid outlet pipe 22, which can reduce the temperature difference between the liquid inlet pipe 21 and the liquid outlet pipe 22, and then reduce the temperature difference of the coolant inside the liquid inlet pipe 21 and the liquid outlet pipe 22, which helps to make the temperature distribution of the coolant in the entire pipeline system more uniform. The temperature of the coolant and the pipeline will affect the temperature of the wire 3 and the cable, so the temperature of each wire 3 (especially the positive wire 31 and the negative wire 32) and the cable can be reduced. This can ensure that all parts of the cable can be effectively cooled, avoid the degradation of cable performance or safety hazards due to excessive temperature differences, and reduce local overheating or overcooling.

[0098] For example, Figure 1 and Figure 2 As shown, the cross-sections of the liquid inlet pipe 21 and the liquid outlet pipe 22 are semicircular respectively, and the cross-section of the cooling pipe 2 is circular.

[0099] Among them, when the cross-sections of the liquid inlet pipe 21 and the liquid outlet pipe 22 are semicircular respectively and the cross-section of the cooling pipe 2 is circular, the planes of the liquid inlet pipe 21 and the liquid outlet pipe 22 are closely fitted, and the curved surface faces the peripheral area.

[0100] It can be understood that the shape of the outer sheath 1 is generally cylindrical, in which case the cross section of the outer sheath 1 can be circular. When the curved surface of the cooling tube 2 faces the peripheral area and the cross section of the outer sheath 1 is circular, the peripheral area is set to a ring shape, and the cross-sectional shape of the positive wire 31 and the negative wire 32 is set to an arc shape, so that the positive wire 31 and the negative wire 32 can be closely fitted with the outer surface of the cooling tube 2 and the inner surface of the outer sheath 1, respectively, and the invalid space inside the outer sheath 1 is reduced, so as to increase the cross-sectional area of ​​the positive wire 31 and the negative wire 32, as well as the cross-sectional area of ​​the liquid inlet pipe 21 and the liquid outlet pipe 22, so that the contact area between each wire 3 and the cooling tube 2 is larger, which can effectively reduce the conduction thermal resistance from the cable to the cooling tube 2, and improve the heat reduction efficiency of the cooling tube 2 on each wire 3, thereby improving the heat dissipation capacity of the liquid-cooled cable. In addition, the liquid inlet 211 of the liquid inlet pipe 21 and the liquid outlet 221 of the liquid outlet pipe 22 have larger areas, which can increase the flow cross-sectional area of ​​the liquid inlet pipe 21 and the liquid outlet pipe 22, and increase the flow rate of the coolant under the same liquid driving device. Increasing the flow rate of the coolant can effectively reduce the temperature rise of the coolant caused by heat absorption along the pipeline, thereby improving the cooling effect and further improving the heat dissipation capacity of the liquid-cooled cable.

[0101] It should be noted that the circular cross-section of the cooling tube 2 is only an example given in the present application, and the cross-section of the cooling tube 2 may also be other shapes, such as the aforementioned elliptical, rectangular, "8" shape, etc. In application, the shapes of the cross-section of the peripheral area and the conductor 3 may be adaptively adjusted according to the cross-section of the cooling tube 2 to reduce the ineffective space inside the outer sheath 1.

[0102] The embodiment of the present application further provides a charging pile, including: a hydraulic pump and a liquid cooling cable as in any of the above embodiments, wherein the hydraulic pump is respectively connected to a liquid inlet pipe 21 and a liquid outlet pipe 22 to form a circulation loop.

[0103] The above-mentioned charging pile drives the coolant to circulate in the cooling tube 2 of the liquid-cooled cable through a hydraulic pump. The liquid-cooled cable includes an outer sheath 1, a cooling tube 2 and a plurality of wires 3. The cooling tube 2 includes a liquid inlet pipe 21 and a liquid outlet pipe 22. By symmetrically arranging the liquid inlet pipe 21 and the liquid outlet pipe 22 in the central area and arranging each wire 3 in the peripheral area surrounding the central area, the space inside the outer sheath 1 can be fully utilized, and the sheath and the cooling tube 2 can be fully utilized as an insulating structure to increase the effective cross-sectional space of each wire 3 and the cooling tube 2, so that the contact area between each wire 3 and the cooling tube 2 is larger, which can effectively reduce the conduction thermal resistance from the cable to the cooling tube 2, and improve the heat reduction efficiency of the cooling tube 2 on each wire 3, thereby improving the heat dissipation capacity of the liquid-cooled cable. In addition, the liquid-cooled cable adopts the above-mentioned structural design, which can make the area of ​​the liquid inlet 211 of the liquid inlet pipe 21 and the liquid outlet 221 of the liquid outlet pipe 22 larger. Increasing the flow cross-sectional area of ​​the liquid inlet pipe 21 and the liquid outlet pipe 22 can increase the flow rate of the coolant under the same hydraulic pump, and increasing the flow rate of the coolant can effectively reduce the temperature rise of the coolant caused by heat absorption along the pipeline, thereby improving the cooling effect and further improving the heat dissipation capacity of the liquid-cooled cable. Moreover, by increasing the flow cross-sectional area of ​​the liquid inlet pipe 21 and the liquid outlet pipe 22, the performance requirements for the hydraulic pump can be reduced under the same heat dissipation requirements. The larger flow cross-sectional area can also reduce the necking phenomenon of the cooling pipe 2 due to external forces.

[0104] The above description is only an exemplary embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the technical concept of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A liquid cooling cable, characterized in that: The liquid cooling cable comprises: an outer sheath, a cooling pipe and a plurality of wires, wherein the cooling pipe comprises a liquid inlet pipe and a liquid outlet pipe; The outer sheath interior includes a central area and a peripheral area surrounding the central area; The liquid inlet pipe and the liquid outlet pipe are arranged in the central area; Each of the conductive wires is disposed in the peripheral area.

2. The liquid cooling cable according to claim 1, characterized in that: The plurality of wires include a positive wire and a negative wire, and the positive wire and the negative wire are arranged at intervals; The first projection of the positive electrode wire toward the cooling tube covers a part of the outer surface of the liquid inlet pipe and a part of the outer surface of the liquid outlet pipe respectively; The second projection of the negative electrode wire onto the cooling tube covers a portion of the outer surface of the liquid inlet pipe and a portion of the outer surface of the liquid outlet pipe respectively, wherein the coverage area of ​​the first projection does not overlap with the coverage area of ​​the second projection.

3. The liquid cooling cable according to claim 2, characterized in that: The positive electrode wire and the negative electrode wire are symmetrically arranged.

4. The liquid cooling cable according to claim 2, characterized in that: The plurality of wires further include: a plurality of signal wires, each of which is located between the positive electrode wire and the negative electrode wire, and is insulated from the positive electrode wire and the negative electrode wire.

5. The liquid cooling cable according to claim 4, characterized in that: The peripheral area includes a first distribution space and a second distribution space located between the positive electrode wire and the negative electrode wire, a portion of the plurality of signal lines is located in the first distribution space, and the remaining portion of the plurality of signal lines is located in the second distribution space.

6. The liquid cooling cable according to claim 1, characterized in that: The liquid-cooled cable further comprises: a plurality of insulating columns, the plurality of insulating columns being distributed between the outer wall of the cooling tube and the inner wall of the outer jacket to separate the peripheral area into a plurality of areas; The plurality of conductive lines are disposed in the plurality of regions, respectively.

7. The liquid cooling cable according to claim 6, characterized in that: The plurality of wires include: a positive wire, a negative wire and a plurality of signal wires; There are at least three insulating columns, which divide the peripheral area into at least three areas; The positive electrode wire and the negative electrode wire are respectively arranged in the two areas, and the plurality of signal lines are arranged in at least one area.

8. The liquid cooling cable according to claim 6, characterized in that: The cooling tube and the plurality of insulating columns are integrally formed.

9. The liquid cooling cable according to claim 1, characterized in that: The liquid-cooling cable further includes a heat-conducting layer, which is disposed on an outer wall of the cooling tube and contacts at least a portion of the plurality of wires.

10. The liquid cooling cable according to claim 9, characterized in that: The plurality of wires include a positive electrode wire and a negative electrode wire, and the heat conductive layer is in contact with the positive electrode wire and the negative electrode wire respectively.

11. The liquid cooling cable according to claim 1, characterized in that: The cross-section of the cooling pipe is circular, rectangular or "8" shaped; the cross-sectional area of ​​the liquid inlet pipe is 0.8-1.2 times the cross-sectional area of ​​the liquid outlet pipe.

12. The liquid cooling cable according to claim 1, characterized in that: The cross-section of the cooling pipe is circular, rectangular or "8" shaped; the cross-sectional area of ​​the liquid inlet pipe is 0.9-1.1 times the cross-sectional area of ​​the liquid outlet pipe.

13. The liquid cooling cable according to claim 1, characterized in that: The outer surface of the liquid inlet pipe is not smaller than the outer surface of the liquid outlet pipe.

14. The liquid cooling cable according to claim 1, characterized in that: The liquid inlet pipe and the liquid outlet pipe are symmetrically arranged, and the cross-sectional areas of the two are equal.

15. A charging pile, characterized in that: include: A hydraulic pump and a liquid-cooled cable according to any one of claims 1 to 14, wherein the hydraulic pump is respectively connected to the liquid inlet pipe and the liquid outlet pipe to form a circulation loop.

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