Liquid-cooled cable capable of monitoring liquid leakage and liquid leakage monitoring control system

Abstract

The invention relates to the technical field of cables, and particularly discloses a liquid-cooled cable capable of monitoring liquid leakage and a liquid leakage monitoring control system. Wherein at least power wire cores and cooling pipes are arranged in a cable core of the liquid-cooled cable; a hollow channel of the cooling pipe is used for flowing of a liquid cooling medium, and the liquid cooling medium is conductive water-based cooling liquid; the cable core is also internally provided with a liquid leakage monitoring wire core which is arranged outside the cooling pipe and forms a monitoring current loop in a charging working condition environment; and when the cooling pipe has liquid leakage in a charging working condition environment, the leaked liquid cooling medium enables the liquid leakage monitoring wire core forming the monitoring current loop to be in short-circuit conduction. According to the liquid-cooled cable, the liquid leakage monitoring wire cores for sensing the liquid leakage phenomenon in a short-circuit conductive mode are arranged in the cable core, so that the liquid leakage phenomenon possibly existing in the service working condition environment of the liquid-cooled cable is dynamically monitored, the monitoring result is timely and reliable, and the overall forming structure is simple and easy to manufacture.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a liquid-cooled cable capable of monitoring liquid leakage and a liquid leakage monitoring and control system. Background Art

[0002] Liquid-cooled cables have liquid cooling medium flowing inside the cable core to cool and exchange heat with the power core, so that the heat generated by the power core inside the cable core when doing work is taken away. They have the technical characteristics of excellent heat dissipation performance, effectively meet the high-power current-carrying working conditions, and have been widely used in the fast charging of new energy vehicles.

[0003] The working conditions in which liquid-cooled cables are used require frequent bending, dragging, and even external force extrusion of the liquid-cooled cables, which is particularly evident in the liquid-cooled cables used in charging piles for new energy vehicles. In such complex working conditions, the cooling tubes inside the liquid-cooled cables, which are used to form the flow channel for the liquid cooling medium, are prone to damage, which can easily cause the liquid cooling medium to leak out of the cooling tube wall. The leakage of the cooling tube wall caused by the flow of liquid cooling medium in the cooling tube, on the one hand, destroys the circulation flow path of the liquid cooling medium, directly damaging the heat dissipation performance of the liquid-cooled cable; on the other hand, it is easy to cause non-technical conductive phenomena to other lines in the cable core, causing safety accidents; on the third hand, there is a safety risk of leakage to the outside of the cable, causing current leakage and endangering the safety of the surrounding areas.

[0004] Based on the particularity of the above-mentioned liquid-cooled cable, it is necessary to monitor the liquid leakage in the cable core. However, various types of liquid-cooled cables currently disclosed do not yet have a liquid leakage monitoring function.

[0005] The applicant has searched and found that Chinese patent literature discloses a technology named "A management method and system for monitoring the operating status of liquid-cooled cables", publication number CN118708976A, and publication date September 27, 2024. This technology can monitor the abnormal operation of liquid-cooled cables. However, the monitoring of the abnormal operation of liquid-cooled cables by this technology depends on the multimodal fusion results of temperature, pressure, and humidity. Therefore, it is necessary to arrange corresponding temperature sensors, pressure sensors, and leakage sensors inside the cable core. Due to the slender characteristics of the cable and the limitations of the detection range of the sensors, a small number of sensors are difficult to cover the slender cables for timely dynamic monitoring. Densely arranged sensors will inevitably bring technical obstacles to the manufacturing and forming of liquid-cooled cables. Therefore, this technology has technical problems such as complex structure, high difficulty in manufacturing technology, and poor reliability of dynamic monitoring. Summary of the invention

[0006] The technical purpose of the present invention is to provide a liquid-cooling cable with a simple structure, easy manufacturing, reliable dynamic monitoring and capable of monitoring liquid leakage, and a liquid leakage monitoring and control system based on the liquid-cooling cable in view of the particularity of the above-mentioned liquid-cooling cable and the shortcomings of the prior art.

[0007] The technical purpose of the present invention is achieved by the following technical solution: a liquid-cooled cable capable of monitoring liquid leakage, wherein at least a power core and a cooling tube are arranged in the cable core of the liquid-cooled cable; The hollow channel of the cooling tube is used for the flow of liquid cooling medium, and the liquid cooling medium is a conductive water-based coolant; The cable core also has a liquid leakage monitoring wire core located outside the cooling tube and forming a monitoring current loop in a charging working environment; When liquid leakage occurs in the cooling tube under charging conditions, the leaked liquid cooling medium will short-circuit the liquid leakage monitoring line core constituting the monitoring current loop.

[0008] The above-mentioned technical measures are aimed at the particularity of the above-mentioned liquid-cooled cable. A liquid leakage monitoring wire core is arranged inside the cable core to sense liquid leakage in a short-circuit conductive manner, so as to dynamically monitor possible liquid leakage of the liquid-cooled cable in the service working environment. Not only are the monitoring results timely and reliable, but the overall molding structure is simple and easy to manufacture.

[0009] As one of the preferred technical solutions, the two liquid leakage monitoring wire cores constituting the monitoring current loop in the cable core are arranged at intervals, and the two liquid leakage monitoring wire cores are respectively close to the outer wall of the cooling tube. This technical measure can construct a monitoring current loop inside the same liquid cooling cable regardless of how the liquid cooling medium circulation loop of the liquid cooling cable is constructed, and conduct targeted monitoring of possible liquid leakage of the liquid cooling cable with cooling tubes, and the monitoring results are reliable.

[0010] As one of the preferred technical solutions, the liquid leakage monitoring wire core is composed of a conductor and an insulating layer wrapped thereon; A plurality of drainage holes for exposing the coated conductor are provided on the insulation layer of the liquid leakage monitoring wire core.

[0011] The above-mentioned technical measures guide the leaked liquid to establish a short-circuit conductive path through the drainage holes on the insulation layer of the liquid leakage monitoring core. While achieving the technical effect of forming a monitoring current loop in a short-circuit conductive manner, the liquid leakage monitoring cores that constitute the monitoring current loop are arranged relatively independently inside the cable core, and maintain normal operation without short-circuit conduction in the absence of liquid leakage, so as to avoid short-circuit conduction in the absence of liquid leakage due to the close arrangement of the wires, thereby reducing the manufacturing technical difficulty of the entire liquid-cooled cable.

[0012] Furthermore, the drainage holes on the insulating layer 1 have a spacing of 5 mm to 20 mm between adjacent drainage holes in the length direction of the liquid leakage monitoring core. This technical measure not only maintains the relatively independent operation of the liquid leakage monitoring core through the insulating layer, but also ensures the rapidity and reliability of establishing a short-circuit conductive path in the event of a liquid leakage through drainage holes arranged at a specific distance, effectively reducing the relative isolation of the insulating layer on the establishment of a short-circuit conductive path in the event of a liquid leakage, thereby ensuring that the monitoring results are relatively timely and reliable.

[0013] Furthermore, the conductor 1 of the liquid leakage monitoring core is a twisted structure of several soft copper wires with a diameter of 0.12mm to 0.3mm. This technical measure can not only reliably establish a monitoring current loop, but also has flexibility, meeting the technical requirements of liquid cooling cables.

[0014] As one of the preferred technical solutions, the cooling pipes in the cable core are multiple and constitute a circulation loop; The power cores in the cable core are multiple and independently arranged, and the power cores are independent of the cooling tubes.

[0015] The above technical measures can independently construct a liquid cooling circulation loop without the need for other independent cables, which is beneficial to the compactness of the cable arrangement structure in the applied working environment.

[0016] As one of the preferred technical solutions, auxiliary cores, signal cores and ground cores are also arranged in the cable core.

[0017] As one of the preferred technical solutions, the cable core is filled with filling ropes arranged between the wire cores and between the wire cores and the cooling tubes.

[0018] As one of the preferred technical solutions, the outside of the cable core is arranged with a cable core tape layer and a sheath layer in sequence from the inside to the outside; The cable core wrapping tape layer is at least one layer of overlapping wrapping structure of non-woven tape or polyester tape; The sheath layer is an extruded structure of a thermoplastic elastomer material.

[0019] A liquid leakage monitoring and control system, comprising a central control unit, the central control unit being used to output a control signal for powering on / off a liquid cooling cable to a charging pile; The central control unit is connected to the liquid leakage monitoring core of the liquid cooling cable and is used to receive the monitoring current loop signal of the liquid leakage monitoring core; When the monitoring current loop feeds back a short-circuit signal to the central control unit, the central control unit outputs a control signal to the charging pile to cut off the power to the liquid cooling cable.

[0020] The above-mentioned technical measures are based on the above-mentioned liquid-cooled cable with a monitoring current loop. The monitoring current loop of the liquid-cooled cable outputs a monitoring signal of normal operation or short-circuit conduction to the central control unit. The central control unit controls the conductive operating state of the liquid-cooled cable according to the short-circuit conduction signal fed back by the monitoring current loop, thereby being able to dynamically and reliably monitor the operating state of the liquid-cooled cable, effectively preventing safety accidents caused by liquid leakage of the liquid-cooled cable, and having a good application effect.

[0021] The beneficial technical effect of the present invention is as follows: the above technical measures are aimed at the particularity of the above liquid-cooled cable, and a liquid leakage monitoring wire core is arranged inside the cable core to sense liquid leakage in a short-circuit conductive manner, so as to dynamically monitor the liquid leakage that may exist in the service working environment of the liquid-cooled cable. Not only is the monitoring result timely and reliable, but the overall molding structure is simple and easy to manufacture. The liquid leakage monitoring and control system including the above liquid-cooled cable controls the conductive operating state of the liquid-cooled cable according to the short-circuit conductive signal fed back by the monitoring current loop in the liquid-cooled cable, can dynamically and reliably monitor the operating state of the liquid-cooled cable, and effectively prevent safety accidents caused by liquid leakage of the liquid-cooled cable, and has a good application effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a structural schematic diagram.

[0023] The meaning of the codes in the figure are: 1—power line core; 11—conductor two; 12—insulation layer two; 2—cooling pipe; 3—liquid leakage monitoring line core; 31—conductor one; 32—insulation layer one; 4—auxiliary line core; 5—signal line core; 6—grounding line core; 7—filling rope; 8—cable core tape layer; 9—sheath layer. DETAILED DESCRIPTION

[0024] The present invention relates to the field of cable technology, and more specifically to a liquid-cooled cable capable of monitoring liquid leakage, and a liquid leakage monitoring and control system based on the liquid-cooled cable. The main technical solution of the present invention is specifically described below in conjunction with a plurality of embodiments. Figure 1 The technical solution of the present invention is explained clearly and in detail; although other embodiments are not separately drawn with drawings, their main structures can still refer to the drawings of embodiment 1.

[0025] It should be noted that the drawings of the present invention are schematic, and unnecessary details have been simplified to clarify the technical purpose of the present invention, so as to avoid blurring the technical solution of the present invention that contributes to the prior art. In addition, the expressions "approximately", "substantially" and the like regarding quantity or matching relationship in the following text mean that reasonable assembly errors and processing errors in the industry are allowed to exist, and do not literally express absolute quantities or matching relationships.

[0026] Example 1 See also Figure 1 As shown, the liquid-cooled cable of the present invention comprises a cable core and a cable core tape layer 8 and a sheath layer 9 which are sequentially coated on the outside of the cable core from the inside to the outside.

[0027] Specifically, the cable core is provided with two positive and negative power cores 1, two liquid leakage monitoring cores 3 for constructing a monitoring current loop, two cooling tubes 2 for constructing a liquid cooling medium circulation loop, and auxiliary cores 4, signal cores 5 and grounding cores 6 required for the working environment.

[0028] The power core 1 is composed of a conductor 11 and an insulating layer 12 wrapped outside. The conductor 11 of the power core 1 is a concentric twisted structure of multiple strands of soft copper wires, with a twisted pitch ratio of about 18 times, and each strand of soft copper wire is a bundle twisted structure of several soft copper wires with a single wire diameter of about 0.15 mm. The insulating layer 12 of the power core 1 is an extruded structure of thermoplastic elastomer material on the outside of the conductor 11. The two power cores 1 in the cable core are arranged relatively independently, and the power core 1 is independent of the cooling tube 2 in the cable core.

[0029] The cooling tube 2 is a heat-resistant silicone rubber extrusion structure, and has a hollow channel inside for the flow of liquid cooling medium. The two cooling tubes 2 are arranged on both sides of the matching gap of the two power line cores 1. The liquid cooling medium circulating in the two cooling tubes 2 is a conductive water-based coolant that is conductive.

[0030] The liquid leakage monitoring core 3 is composed of a conductor 31 and an insulating layer 32 wrapped outside. The conductor 31 of the liquid leakage monitoring core 3 is a bundle twisted structure of several soft copper wires with a single wire diameter of about 0.12mm. The insulating layer 32 of the liquid leakage monitoring core 3 is an extruded structure of a thermoplastic elastomer material on the outside of the conductor 31. The two liquid leakage monitoring cores 3 need to construct a monitoring current loop in a short-circuit conductive manner inside the cable core. In order to ensure the timeliness of monitoring the liquid leakage phenomenon of the cooling tube 2, the two liquid leakage monitoring cores 3 are arranged outside the cooling tube 2 and as close to the outer wall of the cooling tube 2 as possible; at the same time, it is necessary to open a number of drainage holes on the insulating layer 32 of the liquid leakage monitoring core 3 to expose the coated conductor 31 so as to establish a short-circuit conductive path. The shaping of the drainage holes enables the liquid leakage monitoring core 3 with an insulating layer to effectively meet the technical requirements for establishing a short-circuit conductive path. To ensure the timeliness of establishing the short-circuit conductive path, the drainage holes on the insulating layer 32 of the liquid leakage monitoring core 3 are matched in the length direction of the liquid leakage monitoring core 3 with a spacing of about 5 mm between adjacent drainage holes.

[0031] In the arrangement structure of the liquid leakage monitoring core 3 for constructing the monitoring current loop, in order to prevent short circuit conduction in the case of no liquid leakage, the two liquid leakage monitoring cores 3 should be arranged at intervals inside the cable core, and necessary fillers should be provided in the matching gap between the two to separate them.

[0032] As for the auxiliary core 4, signal core 5 and ground core 6 in the cable core, they are manufactured according to the set requirements, and their conductors usually adopt a twisted structure of soft copper wires to adapt to the technical requirements of the working environment for the bending of liquid-cooled cables.

[0033] In the cable core of the above structure, a filling rope 7 made of thermoplastic elastomer material is filled in a whole circle and to separate the cores, between the cores and between the cores and the cooling tube 2 .

[0034] The cable core wrapping tape layer 8 outside the cable core is a three-layer overlapping wrapping structure of non-woven fabric tape, and the overlapping rate of each layer of overlapping wrapping is about 30%.

[0035] The sheath layer 9 outside the cable core tape layer 8 is an extruded structure of a thermoplastic elastomer material.

[0036] The liquid-cooled cable with the above structure is applied to the charging pile of new energy vehicles and is connected between the charging pile and the charging gun. The charging pile and the charging gun cooperate to form a circulation loop for the flow of liquid cooling medium inside the liquid-cooled cable, and the monitoring current loop formed by the liquid leakage monitoring core 3 dynamically monitors the liquid leakage that may occur in the cooling tube 2 in the charging working environment.

[0037] In order to realize the monitoring and control of the liquid-cooled cable, the charging pile is provided with a liquid leakage monitoring and control system, which has a central control unit. The central control unit is used to output a control signal to the charging pile to power on / off the liquid-cooled cable. The central control unit is connected to the liquid leakage monitoring core 3 of the above-mentioned liquid-cooled cable, and is used to receive the monitoring current loop signal of the liquid leakage monitoring core 3. When the cooling tube 2 leaks in the charging working environment, the leaked liquid cooling medium will short-circuit the liquid leakage monitoring core 3 of the monitoring current loop, so that the monitoring current loop will feedback a short-circuit signal to the central control unit, and the central control unit will output a control signal to the charging pile to power off the liquid cooling cable to eliminate safety hazards.

[0038] Example 2 The liquid-cooled cable of the present invention comprises a cable core and a cable core tape layer and a sheath layer which are sequentially coated on the outside of the cable core from the inside to the outside.

[0039] Specifically, the cable core is equipped with two positive and negative power cores, two liquid leakage monitoring cores for building a monitoring current loop, two cooling pipes for building a liquid cooling medium circulation loop, and auxiliary cores, signal cores and grounding cores required for the working environment.

[0040] The power core is composed of conductor 2 and insulating layer 2 wrapped outside. Conductor 2 of the power core is a concentric twisted structure of multiple strands of soft copper wires, with a twisted pitch ratio of about 15 times. Each strand of soft copper wire is a bundle twisted structure of several soft copper wires with a single wire diameter of about 0.12mm. The insulating layer 2 of the power core is an extruded structure of thermoplastic elastomer material on the outside of conductor 2. The two power cores in the cable core are arranged relatively independently, and the power core is independent of the cooling tube in the cable core.

[0041] The cooling tube is a heat-resistant cross-linked polyolefin extrusion structure with a hollow channel inside for the flow of liquid cooling medium. The two cooling tubes are arranged on both sides of the matching gap of the two power line cores. The liquid cooling medium circulating in the two cooling tubes is a conductive water-based coolant that is conductive.

[0042] The liquid leakage monitoring core is composed of a bare conductor. The bare conductor of the liquid leakage monitoring core is a bundle of several soft copper wires with a single wire diameter of about 0.15mm. The two liquid leakage monitoring cores need to construct a monitoring current loop in the cable core in a short-circuit conductive manner. In order to ensure the timeliness of monitoring the liquid leakage of the cooling pipe, the two liquid leakage monitoring cores are arranged on the outside of the cooling pipe and as close to the outer wall of the cooling pipe as possible. In the arrangement structure of the liquid leakage monitoring core for constructing the monitoring current loop, in order to prevent short-circuit conduction in the case of non-liquid leakage, the two liquid leakage monitoring cores should be arranged at intervals inside the cable core, and necessary fillers should be set in the matching gap between the two to separate them.

[0043] As for the auxiliary cores, signal cores and grounding cores in the cable core, they are made according to the set requirements, and their conductors usually adopt a twisted structure of soft copper wire to adapt to the technical requirements of the working environment for the bending of liquid-cooled cables.

[0044] In the cable core of the above structure, the cores are separated into a whole circle, and filling ropes of fiber materials are filled between the cores and between the cores and the cooling tubes, which can also effectively improve the drag resistance of the liquid-cooled cable.

[0045] The cable core wrapping tape layer outside the cable core is a two-layer overlapping wrapping structure of polyester tape, and the overlapping rate of each layer is about 45%.

[0046] The sheath layer outside the cable core tape layer is an extruded structure of thermoplastic elastomer material.

[0047] The liquid-cooled cable with the above structure is applied to the charging pile of new energy vehicles and is connected between the charging pile and the charging gun. The charging pile and the charging gun cooperate to form a circulation loop for the flow of liquid cooling medium inside the liquid-cooled cable, and the monitoring current loop formed by the liquid leakage monitoring wire core dynamically monitors possible liquid leakage in the cooling pipe in the charging working environment.

[0048] In order to realize the monitoring and control of the liquid-cooled cable, the charging pile is provided with a liquid leakage monitoring and control system, which has a central control unit. The central control unit is used to output a control signal to the charging pile to power on / off the liquid-cooled cable. The central control unit is connected to the liquid leakage monitoring core of the above-mentioned liquid-cooled cable, and is used to receive the monitoring current loop signal of the liquid leakage monitoring core. When the cooling pipe leaks in the charging working environment, the leaked liquid cooling medium will cause the liquid leakage monitoring core of the monitoring current loop to short-circuit and conduct, so that the monitoring current loop will feedback a short-circuit signal to the central control unit, and the central control unit will output a control signal to the charging pile to power off the liquid cooling cable to eliminate safety hazards.

[0049] Example 3 The liquid-cooled cable of the present invention comprises a cable core and a cable core tape layer and a sheath layer which are sequentially coated on the outside of the cable core from the inside to the outside.

[0050] Specifically, the cable core is equipped with two positive and negative power cores, two liquid leakage monitoring cores for building a monitoring current loop, two cooling pipes for building a liquid cooling medium circulation loop, and auxiliary cores, signal cores and grounding cores required for the working environment.

[0051] The power core is composed of conductor 2 and insulating layer 2 wrapped outside. Conductor 2 of the power core is a concentric twisted structure of multiple strands of soft copper wires, with a twisted pitch ratio of about 22 times. Each strand of soft copper wire is a bundle twisted structure of several soft copper wires with a single wire diameter of about 0.3mm. The insulating layer 2 of the power core is an extruded structure of thermoplastic elastomer material on the outside of conductor 2. The two power cores in the cable core are arranged relatively independently, and the power core is independent of the cooling tube in the cable core.

[0052] The cooling tube is a heat-resistant silicone rubber extrusion structure with a hollow channel inside for the flow of liquid cooling medium. The two cooling tubes are arranged on both sides of the matching gap of the two power line cores. The liquid cooling medium circulating in the two cooling tubes is a conductive water-based coolant that is conductive.

[0053] The liquid leakage monitoring core is composed of a conductor and an insulating layer wrapped outside. The conductor of the liquid leakage monitoring core is a bundle twisted structure of several soft copper wires with a single wire diameter of about 0.3mm. The insulating layer of the liquid leakage monitoring core is an extruded structure of thermoplastic elastomer material on the outside of the conductor. The two liquid leakage monitoring cores need to construct a monitoring current loop in a short-circuit conductive manner inside the cable core. In order to ensure the timeliness of monitoring the liquid leakage phenomenon of the cooling pipe, the two liquid leakage monitoring cores are arranged outside the cooling pipe and as close to the outer wall of the cooling pipe as possible; at the same time, it is necessary to open a number of drainage holes on the insulating layer of the liquid leakage monitoring core to expose the coated conductor so as to establish a short-circuit conductive path. The shaping of the drainage holes enables the liquid leakage monitoring core with an insulating layer to effectively meet the technical requirements for establishing a short-circuit conductive path. To ensure the timeliness of establishing the short-circuit conductive path, the drainage holes on the insulating layer of the liquid leakage monitoring core are matched in the length direction of the liquid leakage monitoring core with a spacing of about 10 mm between adjacent drainage holes.

[0054] In the arrangement structure of the liquid leakage monitoring core for constructing the monitoring current loop, in order to prevent short circuit conduction in the case of no liquid leakage, the two liquid leakage monitoring cores should be arranged at intervals inside the cable core, and necessary fillers should be provided in the matching gap between the two to separate them.

[0055] As for the auxiliary cores, signal cores and grounding cores in the cable core, they are made according to the set requirements, and their conductors usually adopt a twisted structure of soft copper wire to adapt to the technical requirements of the working environment for the bending of liquid-cooled cables.

[0056] In the cable core of the above structure, the cores are fully circled and separated, and filling ropes made of thermoplastic elastomer material are filled between the cores and between the cores and the cooling tubes.

[0057] The cable core wrapping tape layer outside the cable core is a three-layer overlapping wrapping structure of polyester tape, and the overlapping rate of each layer is about 20%.

[0058] The sheath layer outside the cable core tape layer is an extruded structure of thermoplastic elastomer material.

[0059] The liquid-cooled cable with the above structure is applied to the charging pile of new energy vehicles and is connected between the charging pile and the charging gun. The charging pile and the charging gun cooperate to form a circulation loop for the flow of liquid cooling medium inside the liquid-cooled cable, and the monitoring current loop formed by the liquid leakage monitoring wire core dynamically monitors possible liquid leakage in the cooling pipe in the charging working environment.

[0060] In order to realize the monitoring and control of the liquid-cooled cable, the charging pile is provided with a liquid leakage monitoring and control system, which has a central control unit. The central control unit is used to output a control signal to the charging pile to power on / off the liquid-cooled cable. The central control unit is connected to the liquid leakage monitoring core of the above-mentioned liquid-cooled cable, and is used to receive the monitoring current loop signal of the liquid leakage monitoring core. When the cooling pipe leaks in the charging working environment, the leaked liquid cooling medium will cause the liquid leakage monitoring core of the monitoring current loop to short-circuit and conduct, so that the monitoring current loop will feedback a short-circuit signal to the central control unit, and the central control unit will output a control signal to the charging pile to power off the liquid cooling cable to eliminate safety hazards.

[0061] Example 4 The liquid-cooled cable of the present invention comprises a cable core and a cable core tape layer and a sheath layer which are sequentially coated on the outside of the cable core from the inside to the outside.

[0062] Specifically, the cable core is equipped with a power core that cooperates with other liquid-cooled cables to form a power transmission path, two liquid leakage monitoring cores that construct a monitoring current loop, a cooling pipe that cooperates with other liquid-cooled cables to construct a liquid cooling medium circulation loop, as well as auxiliary cores, signal cores and grounding cores required for the working environment.

[0063] The power core is composed of conductor 2 and insulating layer 2 wrapped outside. Conductor 2 of the power core is a concentric twisted structure of multiple strands of soft copper wires, with a twisted pitch ratio of about 16 times, and each strand of soft copper wire is a bundle twisted structure of several soft copper wires with a single wire diameter of about 0.2mm. The insulating layer 2 of the power core is an extruded structure of thermoplastic elastomer material on the outside of conductor 2. The power core in the cable core is independent of the cooling tube in the cable core.

[0064] The cooling tube is a temperature-resistant cross-linked polyolefin material extrusion structure, and has a hollow channel inside for the flow of liquid cooling medium. The liquid cooling medium flowing in the cooling tube is a conductive water-based coolant that can conduct electricity.

[0065] The liquid leakage monitoring core is composed of a conductor and an insulating layer wrapped outside. The conductor of the liquid leakage monitoring core is a bundle twisted structure of several soft copper wires with a single wire diameter of about 0.25mm. The insulating layer of the liquid leakage monitoring core is an extruded structure of thermoplastic elastomer material on the outside of the conductor. The two liquid leakage monitoring cores need to construct a monitoring current loop in a short-circuit conductive manner inside the cable core. In order to ensure the timeliness of monitoring the liquid leakage phenomenon of the cooling pipe, the two liquid leakage monitoring cores are arranged outside the cooling pipe and as close to the outer wall of the cooling pipe as possible; at the same time, it is necessary to open a number of drainage holes on the insulating layer of the liquid leakage monitoring core to expose the coated conductor so as to establish a short-circuit conductive path. The shaping of the drainage holes enables the liquid leakage monitoring core with an insulating layer to effectively meet the technical requirements for establishing a short-circuit conductive path. To ensure the timeliness of establishing the short-circuit conductive path, the drainage holes on the insulating layer of the liquid leakage monitoring core are matched with a spacing of about 20 mm between adjacent drainage holes in the length direction of the liquid leakage monitoring core.

[0066] In the arrangement structure of the liquid leakage monitoring core for constructing the monitoring current loop, in order to prevent short circuit conduction in the case of no liquid leakage, the two liquid leakage monitoring cores should be arranged at intervals inside the cable core, and necessary fillers should be provided in the matching gap between the two to separate them.

[0067] As for the auxiliary cores, signal cores and grounding cores in the cable core, they are made according to the set requirements, and their conductors usually adopt a twisted structure of soft copper wire to adapt to the technical requirements of the working environment for the bending of liquid-cooled cables.

[0068] In the cable core of the above structure, there are usually filling ropes made of thermoplastic elastomer material to form a whole circle and separate the cores, between the cores, and between the cores and the cooling tubes.

[0069] The cable core wrapping tape layer outside the cable core is an overlapping wrapping structure of a non-woven fabric tape, with an overlapping rate of about 50%.

[0070] The sheath layer outside the cable core tape layer is an extruded structure of thermoplastic elastomer material.

[0071] The liquid-cooling cables of the above structure require two to be used in the charging pile of new energy vehicles, which are connected between the charging pile and the charging gun. The charging pile and the charging gun cooperate with the two liquid-cooling cables to form the positive and negative pole paths for power transmission and the circulation loop for the flow of liquid cooling medium. The monitoring current loop formed by the liquid leakage monitoring core dynamically monitors the possible liquid leakage in the cooling pipe of the liquid cooling cable in the charging working environment.

[0072] In order to realize the monitoring and control of the liquid-cooled cable, the charging pile is provided with a liquid leakage monitoring and control system, which has a central control unit. The central control unit is used to output a control signal to the charging pile to power on / off the liquid-cooled cable. The central control unit is connected to the liquid leakage monitoring core of the above-mentioned liquid-cooled cable, and is used to receive the monitoring current loop signal of the liquid leakage monitoring core. When the cooling pipe leaks in the charging working environment, the leaked liquid cooling medium will cause the liquid leakage monitoring core of the monitoring current loop to short-circuit and conduct, so that the monitoring current loop will feedback a short-circuit signal to the central control unit, and the central control unit will output a control signal to the charging pile to power off the liquid cooling cable to eliminate safety hazards.

[0073] The above embodiments are only used to illustrate the present invention, but not to limit it.

[0074] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the above embodiments or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not deviate the essence of the corresponding technical solutions from the spirit and scope of the present invention.

Claims

1. A liquid-cooled cable capable of monitoring liquid leakage, wherein at least a power core (1) and a cooling tube (2) are arranged in a cable core of the liquid-cooled cable; The hollow channel of the cooling tube (2) is used for the flow of a liquid cooling medium, wherein the liquid cooling medium is a conductive water-based cooling liquid; Features: The cable core also has a liquid leakage monitoring wire core (3) located outside the cooling tube (2) and forming a monitoring current loop in a charging operating environment; When liquid leakage occurs in the cooling tube (2) in a charging operating environment, the leaked liquid cooling medium will short-circuit the liquid leakage monitoring wire core (3) constituting the monitoring current loop.

2. The liquid-cooled cable capable of monitoring liquid leakage according to claim 1, characterized in that: The two liquid leakage monitoring wire cores (3) forming a monitoring current loop in the cable core are arranged at intervals, and the two liquid leakage monitoring wire cores (3) are respectively close to the outer wall of the cooling pipe (2).

3. The liquid-cooled cable capable of monitoring liquid leakage according to claim 1 or 2, characterized in that: The liquid leakage monitoring wire core (3) is composed of a conductor (31) and an insulating layer (32) covering the conductor. The insulating layer 1 (32) of the liquid leakage monitoring wire core (3) is provided with a plurality of drainage holes for exposing the coated conductor 1 (31).

4. The liquid-cooled cable capable of monitoring liquid leakage according to claim 3, characterized in that: The drainage holes on the first insulating layer (32) have a spacing of 5 mm to 20 mm between adjacent drainage holes in the length direction of the liquid leakage monitoring wire core (3).

5. The liquid-cooled cable capable of monitoring liquid leakage according to claim 3, characterized in that: The conductor one (31) of the liquid leakage monitoring wire core (3) is a twisted structure of a plurality of soft copper wires with a diameter of 0.12 mm to 0.3 mm.

6. The liquid-cooled cable capable of monitoring liquid leakage according to claim 1, characterized in that: The cooling pipes (2) in the cable core are multiple and form a circulation loop; The power cores (1) in the cable core are multiple and independently arranged, and the power cores (1) are independent of the cooling tubes (2).

7. The liquid-cooled cable capable of monitoring liquid leakage according to claim 1, characterized in that: An auxiliary wire core (4), a signal wire core (5) and a grounding wire core (6) are also arranged in the cable core.

8. The liquid-cooled cable capable of monitoring liquid leakage according to any one of claims 1, 6 or 7, characterized in that: The cable core is filled with filling ropes (7) arranged between the wire cores and between the wire cores and the cooling tubes (2).

9. The liquid-cooled cable capable of monitoring liquid leakage according to claim 1, characterized in that: The outside of the cable core is arranged with a cable core tape layer (8) and a sheath layer (9) in sequence from the inside to the outside; The cable core wrapping tape layer (8) is a structure of at least one layer of overlapping wrapping of non-woven fabric tape or polyester tape; The sheath layer (9) is an extruded structure of a thermoplastic elastomer material.

10. A liquid leakage monitoring and control system, comprising a central control unit, the central control unit being used to output a control signal for powering on / off a liquid cooling cable to a charging pile; Features: The central control unit is connected to the liquid leakage monitoring core (3) of the liquid cooling cable according to any one of claims 1 to 9, and is used to receive the monitoring current loop signal of the liquid leakage monitoring core (3); When the monitoring current loop feeds back a short-circuit signal to the central control unit, the central control unit outputs a control signal to the charging pile to cut off the power to the liquid cooling cable.

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