Charging pile liquid cooling system

Abstract

The invention relates to the technical field of liquid cooling of charging piles, in particular to a liquid cooling system of a charging pile, which comprises a cooling circulation module for cooling liquid circulation of a charger of the charging pile to reduce the temperature of the charging pile; the detection module comprises a temperature detection assembly which is connected with the cooling liquid circulation assembly and is used for detecting the temperature of the outer skin of the cable and a pressure detection assembly which is connected with the cooling liquid circulation assembly and is used for detecting the pressure of the cable; the fault identification module is used for preliminarily determining a first fault type according to the temperature of the outer skin of the cable, and judging the position change amplitude of the bare conductor according to the change quantity and the change time interval of the pressure of the cable so as to determine the reason of the position change and a second fault type; the correction module is used for adjusting the rotating speed of the coolant pump according to the second fault type or the actual charging power of the charger; the cooling quality and the cooling stability of the charging pile are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of charging pile liquid cooling, and in particular to a charging pile liquid cooling system. Background Art

[0002] The new energy industry represented by electric vehicles is booming. The rapid development of the industry has put forward higher requirements for battery fast charging technology. At the same time, the increase in power during the fast charging process is inevitably accompanied by an increase in heat generation inside the device. On the one hand, the Joule heat of the power components inside the device rises sharply, and on the other hand, the charging gun and the circuit also generate serious heat. In the existing technology, forced air cooling or indirect liquid cooling is mainly used to quickly remove heat from the charging pile to ensure the safe and high-performance operation of the charging pile device.

[0003] Chinese Patent Publication No.: CN117124894B discloses a charging pile liquid cooling system and a control method thereof, which relates to the technical field of new energy equipment, including a base and a shell, a liquid storage tank group is provided on the inner bottom surface of the shell, a circulation pipeline is provided above the liquid storage tank group, a main controller is provided on one side of the circulation pipeline, a liquid cooling box is provided above the circulation pipeline and the main controller, a plurality of charging modules are provided in the middle of the liquid cooling box, a liquid-cooled charging gun assembly is provided on one side of the shell, the liquid storage tank group and the circulation pipeline are both connected to the main controller by telecommunication, the invention stores coolants of different temperatures through a plurality of liquid storage tanks, and circulates and pumps coolants of corresponding temperatures according to the different calorific values ​​of different areas. , thereby avoiding adverse effects caused by large temperature fluctuations of electrical components due to large temperature differences in the coolant; the pumped coolant is delivered to the area with large temperature fluctuations through the liquid delivery unit, thereby more accurately controlling the circulation position of the coolant and accurately controlling the regional temperature in the cooling box. It can be seen that the charging pile liquid cooling system and the control method thereof have the following problems: due to the difficulty in detecting the position changes of the conductors in the cable, the fault identification accuracy of the liquid cooling system is insufficient, and the influence of the extrusion and bending of the cable on the liquid cooling effect is not resolved, resulting in unstable cooling effect of the charging pile liquid cooling system and unstable charging efficiency. Summary of the invention

[0004] To this end, the present invention provides a charging pile liquid cooling system to overcome the problems in the prior art of insufficient accuracy in fault identification of the liquid cooling system due to difficulties in detecting position changes of conductors in the cable, and failure to address the impact of cable extrusion and bending on the liquid cooling effect, resulting in unstable cooling effect and charging efficiency of the charging pile liquid cooling system.

[0005] To achieve the above object, the present invention provides a charging pile liquid cooling system, comprising:

[0006] A cooling circulation module, which lowers the temperature of the charging pile by circulating coolant through the charger of the charging pile, comprises a coolant pump for providing circulation power for the coolant and a coolant circulation component connected to the coolant pump for circulating coolant through the bare conductor in the cable to dissipate heat from the charging pile.

[0007] The coolant circulation assembly includes a first charging cooling tube and a second charging cooling tube which are arranged axially symmetrically with respect to a straight line where the diameter of the cable in the vertical direction is located and are used to cool the bare conductor;

[0008] A detection module connected to the cooling circulation module, comprising a temperature detection component connected to the coolant circulation component for detecting the outer skin temperature of the cable and a pressure detection component connected to the coolant circulation component for detecting the pressure of the cable;

[0009] a fault identification module, which is connected to the cooling cycle module and the detection module respectively, and is used to preliminarily determine the first fault type according to the outer skin temperature of the cable, and determine the position change amplitude of the bare conductor according to the change amount and change time interval of the pressure of the cable, so as to determine the cause of the position change and the second fault type, wherein the first fault type includes a plurality of the second fault types;

[0010] A correction module is respectively connected to the fault identification module, the detection module, the charger and the cooling circulation module, and is used to adjust the rotation speed of the coolant pump according to the second fault type or the actual charging power of the charger.

[0011] Furthermore, the coolant circulation component also includes:

[0012] a circulation coil, which is connected to the first charging cooling pipe and the second charging cooling pipe respectively, and is used to circulate the coolant in the first charging cooling pipe to the second charging cooling pipe;

[0013] a heat dissipation pipeline connected to the second charging cooling pipe and used to dissipate heat in the second charging cooling pipe and the first charging cooling pipe into the air;

[0014] A water tank is connected to the coolant pump and the heat dissipation pipeline respectively to provide a circulation storage space for the coolant.

[0015] Furthermore, the temperature detection component includes a plurality of temperature sensors arranged at equal intervals on the outer surface of the cable.

[0016] Furthermore, the pressure detection assembly includes a plurality of pressure sensors arranged on both sides of the outer surface of the cable in contact with the bare conductor.

[0017] Further, the fault identification module is connected to the plurality of temperature sensors to obtain the outer skin temperature of the cable at a plurality of detection points, and determines the first fault type according to a first number of the detection points that meet a preset temperature condition.

[0018] Among them, if the first number is equal to the total number of the detection points, the fault identification module determines that the fault type is the deterioration of the coolant quality; if the first number is not equal to the total number of the detection points, the fault identification module preliminarily determines that the fault type is the change in the position of the bare conductor; the first fault type includes the deterioration of the coolant quality and the change in the position of the bare conductor.

[0019] Furthermore, the preset temperature condition is that the outer skin temperature of the cable at a single detection point is greater than a preset skin temperature.

[0020] Furthermore, the fault identification module is connected to the plurality of pressure sensors to respectively obtain the pressures of the outer surfaces of the plurality of cables detected during a single charging process and the detection time of the pressures, so as to calculate the maximum change in the pressure of the outer surface of the cable and the time required to complete the change in the maximum change in the pressure.

[0021] If the maximum change is greater than a preset first pressure change and the time required for the change is greater than a preset change time, the fault identification module further determines that the position of the bare conductor has changed.

[0022] Furthermore, the detection module further includes a flow rate sensor disposed at the output end of the second charging cooling pipe for detecting an actual flow rate of the coolant.

[0023] The fault identification module is connected to the flow rate sensor and is used to determine the cause of the position change and the second fault type according to the actual flow rate of the coolant and the maximum change amount.

[0024] If the maximum change is greater than the preset second pressure change and the actual flow rate of the coolant does not increase during the single charging process, the fault identification module determines that there is leakage in the coolant circulation component and issues a fault notification for the leakage of the coolant circulation component;

[0025] If the maximum change is greater than the preset first pressure change and less than or equal to the preset second pressure change, and the actual flow rate of the coolant increases first and then decreases during the single charging process, the fault identification module determines that the degree of compression of the cable does not meet the requirements;

[0026] The second fault type includes leakage of the coolant circulation component and the degree of compression of the cable does not meet the requirements.

[0027] Furthermore, the preset first pressure change is smaller than the preset second pressure change; and the maximum change is the difference between the maximum pressure on the outer surface of the cable and the minimum pressure on the outer surface of the cable during a single charging process.

[0028] Further, the correction module increases the rotation speed of the coolant pump under the condition that the fault identification module determines that the second fault type is that the degree of compression of the cable does not meet the requirements or the actual charging power of the charger is greater than the preset charging power.

[0029] The increase in the rotation speed of the coolant pump is determined by the difference between the actual charging power of the charger and the preset charging power or the difference between the maximum change and the preset first pressure change.

[0030] Compared with the prior art, the beneficial effect of the present invention lies in that the system of the present invention preliminarily determines the first fault type according to the outer skin temperature of the cable through the cooling cycle module, detection module, fault identification module and correction module, and determines the position change amplitude of the bare conductor according to the change in pressure of the cable and the change time interval, so as to determine the cause of the position change and the second fault type, wherein the first fault type includes several of the second fault types, reducing the influence of inaccurate monitoring of the operating status of the charging pile due to inaccurate monitoring of the coolant quality and inaccurate detection of changes in the position of the bare conductor; by accurately determining whether the position of the bare conductor has changed according to the maximum change in pressure on the outer surface of the cable and the time required to complete the change in the maximum change in pressure, the accuracy of identifying the position of the bare conductor is improved; by adjusting the speed of the coolant pump, the influence of the excessive increase in the charger temperature due to the failure to increase the cooling rate during high-power charging, resulting in a decrease in charging efficiency and the failure of the cooling cycle effect to meet the requirements, is reduced, and the cooling quality and cooling stability of the charging pile are improved.

[0031] Furthermore, the system of the present invention sets up a number of temperature sensors and determines the first fault type according to the number of detection points that meet the preset temperature conditions, thereby reducing the impact of inaccurate monitoring of the operating status of the charging pile due to inaccurate monitoring of the coolant quality and inaccurate detection of changes in the position of the bare conductor, thereby improving the accuracy of fault status monitoring of the charging pile.

[0032] Furthermore, the system of the present invention sets a preset first pressure change and a pressure sensor, and accurately determines whether the position of the bare conductor has changed based on the maximum change in pressure on the outer surface of the cable and the time required to complete the change in the maximum change in pressure, thereby improving the accuracy of identifying the position of the bare conductor.

[0033] Furthermore, the system of the present invention, by providing a fault identification module and a flow rate sensor and a preset second pressure change, accurately determines the fault type by combining the maximum pressure change on the outer surface of the cable and the change trend of the actual flow rate of the coolant, thereby reducing the effects of the cooling effect caused by the change in the position of the bare conductor due to leakage and the change in the position of the bare conductor due to the squeezing of the cable, thereby reducing the effects of interference on the cooling effect, thereby further improving the cooling quality and cooling stability of the charging pile.

[0034] Furthermore, the system of the present invention adjusts the rotation speed of the coolant pump according to the second fault type and the actual charging power of the charger through the provided correction module and fault identification module, thereby reducing the influence of the change in the position of the bare conductor caused by the extrusion deformation of the charging cooling tube due to the extrusion of the cable during storage or use on the cooling effect, and reduces the influence of the decrease in charging efficiency and the failure of the cooling cycle effect to meet the requirements due to the rapid increase in the temperature of the charger due to the failure to increase the cooling rate during high-power charging, thereby further improving the cooling stability of the charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the overall structure of the charging pile liquid cooling system according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the cable structure of the charging pile liquid cooling system according to an embodiment of the present invention;

[0037] Figure 3 This is an overall structural block diagram of the charging pile liquid cooling system according to an embodiment of the present invention;

[0038] Figure 4 This is a structural block diagram of a detection module of a charging pile liquid cooling system according to an embodiment of the present invention;

[0039] Explanation of the reference numerals: 1-liquid-cooled outer sheath, 2-coolant, 3-bare conductor, 4-outer skin of the cable, 5-temperature sensor, 6-pressure sensor, 7-circulation coil, 8-second charging cooling pipe, 9-first charging cooling pipe, 10-flow rate sensor, 11-heat dissipation pipeline, 12-coolant pump, 13-water tank, 14-cable. DETAILED DESCRIPTION

[0040] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0042] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0043] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, they are respectively an overall structural diagram of a charging pile liquid cooling system according to an embodiment of the present invention, a structural diagram of a cable 14, an overall structural block diagram, and a structural block diagram of a detection module; a charging pile liquid cooling system according to an embodiment of the present invention comprises:

[0045] A cooling circulation module, which lowers the temperature of the charging pile by circulating the coolant through the charger of the charging pile, comprises a coolant pump 12 for providing circulation power for the coolant 2 and a coolant circulation component connected to the coolant pump 12 for circulating the coolant through the bare conductor 3 in the cable 14 to dissipate heat from the charging pile.

[0046] The coolant circulation assembly includes a first charging cooling tube 9 and a second charging cooling tube 8 which are arranged axially symmetrically with a straight line where the diameter of the cable 14 in the vertical direction is located, and are used to cool the bare conductor 3;

[0047] A detection module connected to the cooling circulation module, comprising a temperature detection component connected to the coolant circulation component for detecting the outer skin temperature of the cable 14 and a pressure detection component connected to the coolant circulation component for detecting the pressure of the cable 14;

[0048] a fault identification module, which is connected to the cooling cycle module and the detection module respectively, and is used to preliminarily determine the first fault type according to the outer skin temperature of the cable 14, and determine the position change amplitude of the bare conductor 3 according to the change amount and change time interval of the pressure of the cable 14, so as to determine the cause of the position change and the second fault type, wherein the first fault type includes a plurality of the second fault types;

[0049] A correction module is respectively connected to the fault identification module, the detection module, the charger and the cooling circulation module, and is used to adjust the rotation speed of the coolant pump 12 according to the second fault type or the actual charging power of the charger.

[0050] Specifically, the first charging cooling tube 9 or the second charging cooling tube 8 includes a liquid-cooled outer jacket 1 and a bare conductor 3, that is, the bare conductor 3 is sleeved in the first charging cooling tube 9 or the second charging cooling tube 8, and the space between the liquid-cooled outer jacket 1 and the bare conductor 3 in the first charging cooling tube 9 or the second charging cooling tube 8 is the circulation space of the coolant 2.

[0051] In practice, the material of the liquid cooling outer jacket 1 is generally nylon 12 (polylaurolactam) or EPDM rubber, and nylon 12 is a preferred embodiment.

[0052] In implementation, the system of the present invention preliminarily determines the first fault type according to the outer skin temperature of the cable 14 through the cooling cycle module, detection module, fault identification module and correction module, and determines the position change amplitude of the bare conductor 3 according to the change in pressure of the cable 14 and the change time interval, so as to determine the cause of the position change and the second fault type, wherein the first fault type includes a plurality of the second fault types, thereby reducing the influence of inaccurate monitoring of the operating status of the charging pile due to inaccurate monitoring of the quality of the coolant 2 and inaccurate detection of changes in the position of the bare conductor 3; by accurately determining whether the position of the bare conductor 3 has changed according to the maximum change in pressure on the outer surface of the cable 14 and the time required to complete the change in the maximum change in pressure, the accuracy of identifying the position of the bare conductor 3 is improved; by adjusting the rotation speed of the coolant pump 12, the influence of the excessive increase in the charger temperature due to the failure to increase the cooling rate during high-power charging, resulting in a decrease in charging efficiency and the failure of the cooling cycle effect to meet the requirements is reduced, thereby improving the cooling quality and cooling stability of the charging pile.

[0053] Specifically, the coolant circulation component also includes:

[0054] a circulation coil 7, which is connected to the first charging cooling pipe 9 and the second charging cooling pipe 8 respectively, and is used for circulating the coolant in the first charging cooling pipe 9 to the second charging cooling pipe 8;

[0055] a heat dissipation pipeline 11, which is connected to the second charging cooling pipe 8 and is used to dissipate heat in the second charging cooling pipe 8 and the first charging cooling pipe 9 into the air;

[0056] The water tank 13 is connected to the coolant pump 12 and the heat dissipation pipeline 11 respectively, so as to provide a circulation storage space for the coolant 2 .

[0057] Specifically, the temperature detection assembly includes a plurality of temperature sensors 5 arranged at equal intervals on the outer surface of the cable 14 .

[0058] In practice, the number of temperature sensors 5 is determined according to the cable length in the charger. Generally speaking, the longer the cable length, the more temperature sensors 5 are set. Those skilled in the art can adaptively set the number of temperature sensors 5 according to the cable length in the charger. In this embodiment, the length of the charger cable 14 is two meters, and the preferred embodiment of the number of temperature sensors 5 is 5, and the setting interval between two adjacent temperature sensors 5 is 0.5 meters.

[0059] Specifically, the pressure detection assembly includes a plurality of pressure sensors 6 arranged on both sides of the outer surface of the cable 14 in contact with the bare conductor 3 .

[0060] In practice, the number of pressure sensors 6 is also determined based on the cable length in the charger. Generally speaking, the longer the cable length, the more pressure sensors 6 are set. Those skilled in the art can adaptively set the number of pressure sensors 6 based on the cable length in the charger. In this embodiment, the length of the charger cable 14 is two meters, and the preferred embodiment of the number of pressure sensors 6 is 4. The spacing between two adjacent pressure sensors 6 is approximately 0.67 meters.

[0061] Specifically, the temperature sensor 5 and the pressure sensor 6 may be arranged at cross positions, or may be arranged at different circumferential positions of the cross section of the cable 14 at the same point.

[0062] Specifically, the fault identification module is connected to the plurality of temperature sensors 5 to obtain the outer skin temperature of the cable 14 at a plurality of detection points, and determines the first fault type according to a first number of the detection points that meet the preset temperature condition.

[0063] Among them, if the first number is equal to the total number of the detection points, the fault identification module determines that the fault type is the deterioration of the quality of the coolant 2; if the first number is not equal to the total number of the detection points, the fault identification module preliminarily determines that the fault type is the change in the position of the bare conductor 3; the first fault type includes the deterioration of the quality of the coolant 2 and the change in the position of the bare conductor 3.

[0064] In implementation, the system of the present invention sets up a plurality of temperature sensors 5 and determines the first fault type according to the number of detection points that meet the preset temperature conditions, thereby reducing the impact of inaccurate monitoring of the operating status of the charging pile due to inaccurate monitoring of the quality of the coolant 2 and inaccurate detection of changes in the position of the bare conductor 3, thereby improving the accuracy of fault status monitoring of the charging pile.

[0065] Specifically, the preset temperature condition is that the outer skin temperature of the cable 14 at a single detection point is greater than the preset skin temperature.

[0066] In implementation, in spring and autumn, the selectable range of the preset skin temperature is [15°C, 21°C].

[0067] Preferably, the preset skin temperature is 17°C.

[0068] Specifically, the fault identification module is connected to the plurality of pressure sensors 6 to respectively obtain the pressures of the outer surfaces of the plurality of cables 14 detected during a single charging process and the detection time of the pressures, so as to calculate the maximum change in the pressure of the outer surface of the cable 14 and the time required to complete the change in the maximum change in the pressure.

[0069] If the maximum change is greater than the preset first pressure change and the time required for the change is greater than the preset change time, the fault identification module further determines that the position of the bare conductor 3 has changed.

[0070] In implementation, the optional range of the preset first pressure change amount is [3Pa, 6Pa], and the optional range of the preset change duration is [2min, 5min].

[0071] Preferably, the preferred embodiment of the preset first pressure change amount is 5Pa, and the preferred embodiment of the preset change time length is 3min.

[0072] In implementation, the system of the present invention sets a preset first pressure change and a pressure sensor 6, and accurately determines whether the position of the bare conductor 3 has changed based on the maximum change in pressure on the outer surface of the cable 14 and the time required to complete the change in the maximum change in pressure, thereby improving the accuracy of identifying the position of the bare conductor 3.

[0073] Specifically, the detection module further includes a flow rate sensor 10 disposed at the output end of the second charging cooling pipe 8 for detecting the actual flow rate of the coolant 2.

[0074] The fault identification module is connected to the flow rate sensor 10, and is used to determine the cause of the position change and the second fault type according to the actual flow rate of the coolant 2 and the maximum change amount.

[0075] If the maximum change is greater than the preset second pressure change and the actual flow rate of the coolant 2 does not increase during the single charging process, the fault identification module determines that there is leakage in the coolant circulation component and issues a fault notification for the leakage of the coolant circulation component;

[0076] If the maximum change is greater than the preset first pressure change and less than or equal to the preset second pressure change, and the actual flow rate of the coolant 2 increases first and then decreases during the single charging process, the fault identification module determines that the degree of compression of the cable 14 does not meet the requirements;

[0077] The second fault type includes leakage of the coolant circulation component and the degree of compression of the cable 14 not meeting the requirements.

[0078] In implementation, the optional range of the preset second pressure change amount is (6Pa, 10Pa].

[0079] Preferably, the preferred embodiment of the preset second pressure change amount is 7.5Pa.

[0080] In implementation, the system of the present invention sets a fault identification module and a flow rate sensor 10 and sets a preset second pressure change, and accurately determines the fault type by combining the maximum pressure change on the outer surface of the cable 14 and the change trend of the actual flow rate of the coolant 2, thereby reducing the influence of the cooling effect caused by the change in the position of the bare conductor 3 due to leakage and the change in the position of the bare conductor 3 due to the squeezing of the cable 14, thereby reducing the influence of interference on the cooling effect, thereby further improving the cooling quality and cooling stability of the charging pile.

[0081] Specifically, the preset first pressure change is smaller than the preset second pressure change; the maximum change is the difference between the maximum pressure on the outer surface of the cable 14 and the minimum pressure on the outer surface of the cable 14 during a single charging process.

[0082] Specifically, the correction module increases the rotation speed of the coolant pump 12 when the fault identification module determines that the second fault type is that the degree of compression of the cable 14 does not meet the requirements or the actual charging power of the charger is greater than the preset charging power.

[0083] The increase range of the rotation speed of the coolant pump 12 is determined by the difference between the actual charging power of the charger and the preset charging power or the difference between the maximum change and the preset first pressure change.

[0084] In implementation, when the second fault type is that the degree of compression of the cable 14 does not meet the requirements, the speed of the coolant pump 12 is increased. That is to say, the speed of the coolant pump 12 at this time and the maximum change are related to the difference between the preset first pressure change. In this embodiment, the preferred embodiment of the preset first pressure change is 5Pa. When the maximum change exceeds the value of the preset first pressure change within 2Pa, the speed of the coolant pump 12 is adjusted to 1.1 times the current speed of the coolant pump 12. When the maximum change exceeds the value of the preset first pressure change by more than 2Pa, the speed of the coolant pump 12 is increased by 1r / min for every 0.1Pa that exceeds 2Pa.

[0085] For example, a charging pile for charging new energy vehicles is provided with a liquid cooling system. The current rotation speed of the coolant pump 12 is 800 r / min, and the maximum change is 6 Pa. Then the rotation speed of the coolant pump 12 is increased to 800 r / min×1.1=880 r / min.

[0086] In implementation, the optional range of the preset charging power is [6.9kW, 7.3kW].

[0087] Preferably, the preset charging power is 7.1 kW.

[0088] In implementation, when the actual charging power of the charger is greater than the preset charging power, the speed of the coolant pump 12 is increased. When the actual charging power of the charger exceeds the preset charging power by less than 0.1kW, the speed of the coolant pump 12 is adjusted to 1.2 times the current speed of the coolant pump 12. When the actual charging power of the charger exceeds the preset charging power by more than 0.1kW, the speed of the coolant pump 12 is increased by 1.5r / min for every 0.01kW exceeding the preset charging power. For example, for the charging pile of new energy vehicles, the preset charging power is 7.1kW. When it reaches or exceeds 7.1kW, it is determined that high-power charging is being performed. At this time, the cooling speed must be fast. The current speed of the coolant pump 12 is 800r / min, and the actual charging power of the charger is 7.25kW. The speed of the coolant pump 12 is increased to 800r / min×1.2+1.5r / min×(7.25kW-7.1kW) / 0.01kW=982.5r / min.

[0089] In implementation, the system of the present invention adjusts the rotation speed of the coolant pump 12 according to the second fault type and the actual charging power of the charger through the provided correction module and fault identification module, thereby reducing the influence of the change in the position of the bare conductor 3 caused by the extrusion deformation of the charging cooling tube due to the extrusion of the cable 14 during storage or use on the cooling effect, and reducing the influence of the rapid increase in the charger temperature due to the failure to increase the cooling rate during high-power charging, resulting in a decrease in charging efficiency and the cooling cycle effect not meeting the requirements, thereby further improving the cooling stability of the charging pile.

[0090] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A charging pile liquid cooling system, characterized in that: include: A cooling circulation module, which lowers the temperature of the charging pile by circulating coolant through the charger of the charging pile, comprises a coolant pump for providing circulation power for the coolant and a coolant circulation component connected to the coolant pump for circulating coolant through the bare conductor in the cable to dissipate heat from the charging pile. The coolant circulation assembly includes a first charging cooling tube and a second charging cooling tube which are arranged axially symmetrically with respect to a straight line where the diameter of the cable in the vertical direction is located and are used to cool the bare conductor; A detection module connected to the cooling circulation module, comprising a temperature detection component connected to the coolant circulation component for detecting the outer skin temperature of the cable and a pressure detection component connected to the coolant circulation component for detecting the pressure of the cable; a fault identification module, which is connected to the cooling cycle module and the detection module respectively, and is used to preliminarily determine the first fault type according to the outer skin temperature of the cable, and determine the position change amplitude of the bare conductor according to the change amount and change time interval of the pressure of the cable, so as to determine the cause of the position change and the second fault type, wherein the first fault type includes a plurality of the second fault types; A correction module is respectively connected to the fault identification module, the detection module, the charger and the cooling circulation module, and is used to adjust the rotation speed of the coolant pump according to the second fault type or the actual charging power of the charger.

2. The charging pile liquid cooling system according to claim 1, characterized in that: The coolant circulation assembly also includes: a circulation coil, which is connected to the first charging cooling pipe and the second charging cooling pipe respectively, and is used to circulate the coolant in the first charging cooling pipe to the second charging cooling pipe; a heat dissipation pipeline connected to the second charging cooling pipe and used to dissipate heat in the second charging cooling pipe and the first charging cooling pipe into the air; A water tank is connected to the coolant pump and the heat dissipation pipeline respectively to provide a circulation storage space for the coolant.

3. The charging pile liquid cooling system according to claim 1, characterized in that: The temperature detection assembly includes a plurality of temperature sensors arranged at equal intervals on the outer surface of the cable.

4. The charging pile liquid cooling system according to claim 3, characterized in that: The pressure detection assembly includes a plurality of pressure sensors arranged on both sides of the outer surface of the cable in contact with the bare conductor.

5. The charging pile liquid cooling system according to claim 4, characterized in that: The fault identification module is connected to the plurality of temperature sensors to obtain the outer skin temperature of the cable at a plurality of detection points, and determines the first fault type according to a first number of the detection points that meet a preset temperature condition. Among them, if the first number is equal to the total number of the detection points, the fault identification module determines that the fault type is the deterioration of the coolant quality; if the first number is not equal to the total number of the detection points, the fault identification module preliminarily determines that the fault type is the change in the position of the bare conductor; the first fault type includes the deterioration of the coolant quality and the change in the position of the bare conductor.

6. The charging pile liquid cooling system according to claim 5, characterized in that: The preset temperature condition is that the outer skin temperature of the cable at a single detection point is greater than the preset skin temperature.

7. The charging pile liquid cooling system according to claim 6, characterized in that: The fault identification module is connected to the plurality of pressure sensors to respectively obtain the pressures of the outer surfaces of the plurality of cables detected during a single charging process and the detection time of the pressures, so as to calculate the maximum change in the pressure of the outer surface of the cable and the time required to complete the change in the maximum change in the pressure. If the maximum change is greater than a preset first pressure change and the time required for the change is greater than a preset change time, the fault identification module further determines that the position of the bare conductor has changed.

8. The charging pile liquid cooling system according to claim 7, characterized in that: The detection module further includes a flow rate sensor disposed at the output end of the second charging cooling pipe for detecting an actual flow rate of the coolant. The fault identification module is connected to the flow rate sensor and is used to determine the cause of the position change and the second fault type according to the actual flow rate of the coolant and the maximum change amount. If the maximum change is greater than the preset second pressure change and the actual flow rate of the coolant does not increase during the single charging process, the fault identification module determines that there is leakage in the coolant circulation component and issues a fault notification for the leakage of the coolant circulation component; If the maximum change is greater than the preset first pressure change and less than or equal to the preset second pressure change, and the actual flow rate of the coolant increases first and then decreases during the single charging process, the fault identification module determines that the degree of compression of the cable does not meet the requirements; The second fault type includes leakage of the coolant circulation component and the degree of compression of the cable does not meet the requirements.

9. The charging pile liquid cooling system according to claim 8, characterized in that: The preset first pressure change is smaller than the preset second pressure change; the maximum change is the difference between the maximum pressure on the outer surface of the cable and the minimum pressure on the outer surface of the cable during a single charging process.

10. The charging pile liquid cooling system according to claim 9, characterized in that: The correction module increases the rotation speed of the coolant pump when the fault identification module determines that the second fault type is that the degree of compression of the cable does not meet the requirements or the actual charging power of the charger is greater than the preset charging power. The increase in the rotation speed of the coolant pump is determined by the difference between the actual charging power of the charger and the preset charging power or the difference between the maximum change and the preset first pressure change.

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