A DC high-voltage liquid cooling circuit switching system and control method thereof

Abstract

The present invention provides a direct current high-voltage liquid-cooling circuit switching system and a control method thereof, the system comprising: the positive and negative poles of the input end of a switch switching device are used as the positive and negative poles of the input end of a high-voltage switching box, and are connected to a direct current source through a high-voltage wiring harness; the first output end of the switch switching device is connected to a first output interface; the second output end of the switch switching device is connected to a second output interface; when the switch switching device is in a first state, the high-voltage switching box adopts the first output interface to output a current corresponding to the first output interface; when the switch switching device is in a second state, the high-voltage switching box adopts the second output interface to output a current corresponding to the second output interface, and a liquid cooling unit is used to perform cold treatment on a cable corresponding to the second output interface; on the basis of not changing the cable diameter, the current range supported by the direct current high-voltage liquid-cooling circuit switching system is improved, the applicability of the direct current high-voltage liquid-cooling circuit switching system is improved, the cost is reduced, and the space layout is convenient.

Description

Technical Field

[0001] The present invention belongs to the field of direct current high voltage technology, and more specifically, particularly relates to a direct current high voltage liquid cooling circuit switching system and a control method thereof. Background Art

[0002] In power transmission systems, DC high-voltage circuits play a vital role. These circuits are usually used to carry fixed current or power values ​​within a specific range to ensure the stable operation of the power system. However, with the continuous growth of power demand and the continuous advancement of power technology, higher requirements are placed on the flexibility and carrying capacity of DC high-voltage circuits.

[0003] For existing DC high-voltage circuits, wire harnesses with smaller diameters are generally used, which results in limited current carrying capacity. In order to improve the current carrying capacity, if wire harnesses with larger diameters are used, there will be problems of high cost and inconvenient spatial layout. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a DC high-voltage liquid cooling circuit switching system and a control method thereof, which are used to improve the current range supported by the DC high-voltage liquid cooling circuit switching system without changing the cable diameter, improve the applicability of the DC high-voltage liquid cooling circuit switching system, reduce costs and facilitate spatial layout.

[0005] The first aspect of the present application discloses a DC high-voltage liquid cooling circuit switching system, comprising: a DC source, a high-voltage wiring harness, and a high-voltage switching box;

[0006] The high-voltage switch box includes: a switch switching device, a first output interface, a second output interface and a liquid cooling unit;

[0007] The positive and negative electrodes of the input terminals of the switch switching device serve as the positive and negative electrodes of the input terminals of the high-voltage switch box, and are connected to a DC source through a high-voltage wiring harness;

[0008] The first output end of the switch switching device is connected to the first output interface; the second output end of the switch switching device is connected to the second output interface;

[0009] When the switch switching device is in the first state, the high-voltage switching box adopts the first output interface to output the current corresponding to the first output interface; when the switch switching device is in the second state, the high-voltage switching box adopts the second output interface to output the current corresponding to the second output interface, and adopts the liquid cooling unit to cool the cable corresponding to the second output interface.

[0010] Optionally, in the above-mentioned DC high-pressure liquid cooling circuit switching system, the second output interface allows the output current to be higher than the output current allowed by the first output interface.

[0011] Optionally, in the above-mentioned DC high-voltage liquid cooling circuit switching system, the switch switching device includes: a first switch unit and a second switch unit;

[0012] The first end of the first switch unit serves as a negative input terminal of the switch switching device;

[0013] The second end of the first switch unit is connected to the negative pole of the first output interface of the high-voltage switch box;

[0014] The third end of the first switch unit is connected to the negative pole of the second output interface of the high-voltage switch box;

[0015] The first end of the second switch unit serves as the positive input terminal of the switch switching device;

[0016] The second end of the second switch unit is connected to the positive pole of the first output interface of the high-voltage switch box;

[0017] The third end of the second switch unit is connected to the positive pole of the second output interface of the high-voltage switch box.

[0018] Optionally, in the above-mentioned DC high-voltage liquid cooling circuit switching system, the first switch unit and / or the second switch unit both include: a switching unit and a single-pole double-throw switch;

[0019] The first end of the switching unit serves as the first end of the corresponding switch unit;

[0020] The second end of the switching unit is connected to the fixed end of the single-pole double-throw switch;

[0021] The first moving end of the single-pole double-throw switch serves as the second end of the corresponding switch unit;

[0022] The second moving end of the single-pole double-throw switch serves as the third end of the corresponding switch unit.

[0023] Optionally, the above-mentioned DC high-pressure liquid cooling circuit switching system further includes: a DC voltmeter;

[0024] The DC voltmeter is arranged between the first switch unit and the second switch unit.

[0025] Optionally, in the above-mentioned DC high-voltage liquid cooling circuit switching system, the output end of the liquid cooling unit is respectively connected to the second output interface and the second output end of the switch switching device; and the cable connected to the output end of the liquid cooling unit is a liquid cooling cable.

[0026] Optionally, in the above-mentioned DC high-voltage liquid cooling circuit switching system, the liquid cooling unit includes: a liquid cooler and a voltage conversion unit;

[0027] The input end of the voltage conversion unit is connected to an AC source;

[0028] The output end of the voltage conversion unit is connected to the input end of the liquid cooling machine;

[0029] The output end of the liquid cooling machine is connected to the second output interface through a liquid cooling cable.

[0030] Optionally, the above-mentioned DC high-voltage liquid cooling circuit switching system further includes: an isolation detection device;

[0031] The isolation detection device is arranged at the input end of the high-voltage switching box.

[0032] Optionally, the above-mentioned DC high-voltage liquid cooling circuit switching system further includes an insulation monitoring device;

[0033] The insulation monitoring device is provided at the first output interface and the second output interface in the high-voltage switch box.

[0034] The second aspect of the present application discloses a control method for a DC high-voltage liquid cooling circuit switching system, which is applied to the DC high-voltage liquid cooling circuit switching system as described in any one of the first aspects of the present application, and the control method includes:

[0035] Determining the current demand of the DC high-voltage liquid cooling circuit switching system;

[0036] Determine whether the current demand is greater than a first threshold, where the first threshold is an upper current limit corresponding to the first output interface;

[0037] If so, control the switch switching device in the DC high-pressure liquid cooling circuit switching system to be in the second state, so that the high-voltage switching box in the DC high-pressure liquid cooling circuit switching system adopts the second output interface as the output interface, and outputs the current corresponding to the current demand through the second output interface;

[0038] If not, the switch switching device in the DC high-pressure liquid cooling circuit switching system is controlled to be in the first state, so that the high-voltage switching box in the DC high-pressure liquid cooling circuit switching system adopts the first output interface as the output interface, and outputs the current corresponding to the current demand through the first output interface.

[0039] From the above technical solution, it can be seen that the present invention provides a DC high-voltage liquid-cooling circuit switching system, wherein: the positive and negative electrodes of the input end of the switch switching device serve as the positive and negative electrodes of the input end of the high-voltage switching box, and are connected to the DC source through a high-voltage wiring harness; the first output end of the switch switching device is connected to the first output interface; the second output end of the switch switching device is connected to the second output interface; when the switch switching device is in the first state, the high-voltage switching box adopts the first output interface to output the current corresponding to the first output interface; when the switch switching device is in the second state, the high-voltage switching box adopts the second output interface to output the current corresponding to the second output interface, and the liquid cooling unit is used to cold-treat the cable corresponding to the second output interface; that is, the DC high-voltage liquid-cooling circuit switching system can switch between the first output interface and the second output interface, so that when the current required by the DC high-voltage liquid-cooling circuit switching system is different, the unused output interface is used, and the liquid cooling unit cold-treats the cable corresponding to the second output interface, which can avoid the problem of further damage due to excessive current and high temperature of the wire, and on the basis of not changing the cable diameter, the current range supported by the DC high-voltage liquid-cooling circuit switching system is improved, the applicability of the DC high-voltage liquid-cooling circuit switching system is improved, and the cost and space layout are convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 is a schematic diagram of a DC high-voltage liquid cooling circuit switching system provided by an embodiment of the present invention;

[0042] Figure 2 is a schematic diagram of a DC high-voltage liquid cooling circuit switching system provided by an embodiment of the present invention;

[0043] Figure 3 It is a flow chart of a control method of a DC high-voltage liquid cooling circuit switching system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the present application, the term "comprises", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the sentence "comprising one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. In addition, the terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here, for example.

[0046] An embodiment of the present application provides a DC high-voltage liquid cooling circuit switching system, which is used to solve the problem that smaller diameter wiring harnesses are commonly used in the prior art, which leads to limited current flow capacity; in order to improve the current flow capacity, if a larger diameter wiring harness is used, it will face the problems of high cost and inconvenient spatial layout.

[0047] See also Figure 1 , a DC high-voltage liquid cooling circuit switching system includes: a DC source, a high-voltage wiring harness and a high-voltage switching box.

[0048] Specifically, the positive and negative electrodes of the output terminal of the DC source are connected to the positive and negative electrodes of one end of the high-voltage wiring harness, and the positive and negative electrodes of the other end of the high-voltage wiring harness are connected to the positive and negative electrodes of the input terminal of the high-voltage switching box. More specifically, the positive electrode of the output terminal of the DC source is connected to the positive electrode of the input terminal of the high-voltage switching box through the positive cable in the high-voltage wiring harness; the negative electrode of the output terminal of the DC source is connected to the negative electrode of the input terminal of the high-voltage switching box through the negative cable in the high-voltage wiring harness.

[0049] The ground wire in the high-voltage wiring harness is grounded; the ground wires of each device or interface in the high-voltage switching box are also grounded; that is, each device and interface in the DC high-voltage liquid cooling loop switching system is connected to a common ground.

[0050] The high-voltage switching box includes: a switch switching device, a first output interface, a second output interface and a liquid cooling unit.

[0051] The liquid cooling unit is designed for efficient liquid cooling of the wiring harness of the high-voltage switch box, aiming to significantly improve the current carrying capacity of the wiring harness without increasing its diameter, thus effectively resolving the contradiction between high current transmission and cost and space in traditional designs.

[0052] The positive and negative poles of the input end of the switch switching device serve as the positive and negative poles of the input end of the high-voltage switching box, and are connected to the DC source through a high-voltage wiring harness to ensure the stable input of electrical energy.

[0053] The first output end of the switch device is connected to the first output interface; the second output end of the switch device is connected to the second output interface.

[0054] Specifically, the positive and negative electrodes of the first output terminal of the switch switching device are connected to the positive and negative electrodes of the first output interface; the positive and negative electrodes of the second output terminal of the switch switching device are connected to the positive and negative electrodes of the second output interface.

[0055] When the switch device is in the first state, the high-voltage switching box adopts the first output interface to output the current corresponding to the first output interface; when the switch device is in the second state, the high-voltage switching box adopts the second output interface to output the current corresponding to the second output interface, and adopts the liquid cooling unit to cool the cable corresponding to the second output interface.

[0056] That is to say, when the switch switching device is in the first state, the first output interface is selected as the main interface for power output, and the current matching the first output interface is output through the first output interface; when the switch switching device is switched to the second state, the second output interface is used for power output, and at the same time, a liquid cooling unit is used for liquid cooling. At this time, a higher capacity current can be output to adapt to different load requirements.

[0057] The upper limit of the current that the first output interface can withstand can be 300A, and the upper limit of the current that the second output interface can withstand can be 800A. There is no specific limitation here. It depends on the actual situation and is within the protection scope of this application. The two output interfaces of the high-voltage switching box are used to connect DC power equipment. I will not go into details here. It depends on the actual situation and is within the protection scope of this application.

[0058] Specifically, the DC high-voltage liquid-cooled circuit switching system provided in the present application can be used in new energy testing or high-voltage DC switching equipment. For example, new energy testing equipment imitates a DC charging pile to charge a car. Under normal circumstances, 300A can meet the charging demand, but with the demand for high-power charging, the current wiring harness cannot meet the demand. This switching method can be used to achieve 800A high-power charging.

[0059] In summary, the DC high-voltage liquid-cooled loop switching system not only greatly improves the current carrying capacity of the loop by introducing liquid cooling technology and intelligent switching mechanism, but also gives the system a high degree of flexibility and adaptability, providing strong technical support for coping with increasingly complex and changeable power transmission challenges.

[0060] In this embodiment, the positive and negative electrodes of the input end of the switch switching device serve as the positive and negative electrodes of the input end of the high-voltage switching box, and are connected to the DC source through a high-voltage wiring harness; the first output end of the switch switching device is connected to the first output interface; the second output end of the switch switching device is connected to the second output interface; when the switch switching device is in the first state, the high-voltage switching box adopts the first output interface to output the current corresponding to the first output interface; when the switch switching device is in the second state, the high-voltage switching box adopts the second output interface to output the current corresponding to the second output interface, and the liquid cooling unit is used to cool the cable corresponding to the second output interface; that is, the DC high-voltage liquid cooling circuit switching system can switch between the first output interface and the second output interface, so that when the current required by the DC high-voltage liquid cooling circuit switching system is different, the unused output interface is used, and the liquid cooling unit cools the cable corresponding to the second output interface, which can avoid the problem of further damage due to excessive current and high temperature of the wire, and on the basis of not changing the cable diameter, the current range supported by the DC high-voltage liquid cooling circuit switching system is improved, the applicability of the DC high-voltage liquid cooling circuit switching system is improved, and the cost and space layout are convenient.

[0061] Optionally, the switch switching device includes: a first switch unit and a second switch unit.

[0062] It should be noted that the first switch unit can be a negative switch unit, and the second switch unit can be a positive switch unit, that is, the first switch unit mainly connects the negative cable in the wiring harness and / or the negative end of the device; the second switch unit mainly connects the positive cable in the wiring harness and / or the positive end of the device.

[0063] The first end of the first switch unit serves as the negative input terminal of the switch switching device and is connected to the negative input terminal of the high-voltage switch box; more specifically, the first end of the first switch unit is connected to the negative pole of the DC source through a negative high-voltage wiring harness.

[0064] The second end of the first switch unit is connected to the negative pole of the first output interface of the high-voltage switch box.

[0065] The third end of the first switch unit is connected to the negative pole of the second output interface of the high-voltage switch box.

[0066] The first end of the second switch unit serves as the positive input terminal of the switch switching device and is connected to the positive input terminal of the high-voltage switching box; more specifically, the first end of the second switch unit is connected to the positive pole of the DC source through a positive high-voltage wiring harness.

[0067] The second end of the second switch unit is connected to the positive pole of the first output interface of the high-voltage switch box.

[0068] The third end of the second switch unit is connected to the positive pole of the second output interface of the high-voltage switch box.

[0069] The refined design of the switch switching device, especially the connection between the first switch unit and the second switch unit, not only ensures the stable input and efficient distribution of electrical energy in the DC high-voltage liquid cooling circuit switching system, but also provides a solid technical foundation for the flexible switching of the system under different load requirements.

[0070] Optionally, the first switch unit and / or the second switch unit both include: a switching unit and a single-pole double-throw switch.

[0071] The first end of the switching unit serves as the first end of the corresponding switch unit; the second end of the switching unit is connected to the fixed end of the single-pole double-throw switch; the first moving end of the single-pole double-throw switch serves as the second end of the corresponding switch unit; and the second moving end of the single-pole double-throw switch serves as the third end of the corresponding switch unit.

[0072] Specifically, the first switch unit includes: a first switching unit and a second single-pole double-throw switch.

[0073] The first end of the first switching unit serves as the first end of the first switching unit, and is connected to the negative pole of the DC source through a negative high-voltage wiring harness; the second end of the first switching unit is connected to the fixed end of the first single-pole double-throw switch; the first moving end of the first single-pole double-throw switch serves as the second end of the first switching unit, and is connected to the negative pole of the first output interface; the second moving end of the first single-pole double-throw switch serves as the third end of the first switching unit, and is connected to the negative pole of the second output interface.

[0074] The second switch unit includes: a second switching unit and a second single-pole double-throw switch.

[0075] The first end of the second switching unit serves as the first end of the second switching unit, and is connected to the positive pole of the DC source through the positive high-voltage wiring harness; the second end of the second switching unit is connected to the fixed end of the second single-pole double-throw switch; the first moving end of the second single-pole double-throw switch serves as the second end of the second switching unit, and is connected to the positive pole of the first output interface; the second moving end of the second single-pole double-throw switch serves as the third end of the second switching unit, and is connected to the positive pole of the second output interface.

[0076] like Figure 2 As shown, the first switching unit is a negative pole switching switch; the second switching unit is a positive pole switching switch; S0 is a first single-pole double-throw switch; and S1 is a second single-pole double-throw switch.

[0077] When the fixed end of the first single-pole double-throw switch is connected to the first movable end, and the fixed end of the second single-pole double-throw switch is connected to the first movable end, the switch switching device is in the first state, that is, the first output interface is used to output current; when the fixed end of the first single-pole double-throw switch is connected to the second movable end, and the fixed end of the second single-pole double-throw switch is connected to the second movable end, the switch switching device is in the second state, that is, the second output interface is used to output current.

[0078] The first single-pole double-throw switch can be a relay, and the switch state can be switched by a manual button or by purchasing a special signal. The details will not be described here one by one, and it depends on the actual situation.

[0079] Optionally, it also includes: a DC voltmeter.

[0080] The DC voltmeter is arranged between the first switch unit and the second switch unit.

[0081] Specifically, one end of the DC voltmeter is connected to the fourth end of the first switch unit; the other end of the DC voltmeter is connected to the fourth end of the second switch unit; more specifically, the negative cable of the DC voltmeter is connected to the third end of the negative switching switch (first switching unit); the positive pole of the DC voltmeter is connected to the third end of the positive switching switch through the positive cable.

[0082] The output end of the liquid cooling unit is connected to the second output interface and the second output end of the switch device respectively; and the cable connected to the output end of the liquid cooling unit is a liquid cooling cable.

[0083] Specifically, the positive and negative electrodes of the output terminal of the liquid cooling unit are connected to the positive and negative electrodes of the second output interface.

[0084] Optional, such as Figure 2 As shown, the liquid cooling unit includes: a liquid cooling machine and a voltage conversion unit (such as Figure 2 220 / 12V as shown).

[0085] The input end of the voltage conversion unit is connected to an AC power source.

[0086] The voltage conversion unit can convert the AC voltage signal output by the AC source into a low-voltage DC voltage signal, and the low-voltage voltage signal can be the working voltage required by the liquid cooler, such as a DC 12V voltage.

[0087] The output end of the voltage conversion unit is connected to the input end of the liquid cooling machine. The voltage conversion unit provides the liquid cooling machine with an operating voltage.

[0088] The output end of the liquid cooling machine is connected to the second output interface through a liquid cooling cable.

[0089] The coolant in the liquid-cooled cable is circulated through a liquid cooler, and the coolant in the cable is circulated, thereby achieving the purpose of cooling the cable.

[0090] Optionally, it also includes: isolation detection equipment.

[0091] The isolation detection equipment is arranged at the input end of the high voltage switching box.

[0092] The isolation detection can receive power from the voltage conversion unit in the liquid cooling unit, or it can use an independent power supply. We will not go into details here, and it depends on the actual situation, all of which are within the protection scope of this application.

[0093] That is to say, the liquid cooling unit can receive direct current power supply or alternating current power supply, as long as the voltage conversion unit converts it into the working voltage required by the liquid cooling machine.

[0094] The isolation detection equipment can be used to detect the isolation between the high-voltage switch box and the liquid cooling unit.

[0095] That is to say, in the DC high-voltage liquid-cooling circuit switching system, in order to further enhance the safety and reliability of the system, an isolation detection device is specially added and cleverly set between the voltage conversion unit and the high-voltage switching box.

[0096] The main function of the isolation detection equipment is to establish an electrical isolation barrier between the voltage conversion unit and the high-voltage switch box, and monitor the integrity of the isolation state in real time. This design can effectively prevent safety hazards such as short circuits and electric shocks caused by electrical isolation failure, and ensure the stable operation of the system in a high voltage and high current environment.

[0097] Through the precise monitoring and early warning of isolation detection equipment, the system can promptly detect and handle potential isolation problems, thereby avoiding safety accidents. This innovative design not only improves the safety of the system, but also provides a solid technical guarantee for the widespread application of DC high-voltage liquid cooling circuit switching systems.

[0098] Optionally, an insulation monitoring device is also included.

[0099] Insulation monitoring devices are provided at the first output interface and the second output interface in the high-voltage switch box.

[0100] Specifically, Figure 2 As shown, an insulation monitoring device 1 is arranged at a first output interface in the high-voltage switch box; and an insulation monitoring device 2 is arranged at a second output interface in the high-voltage switch box.

[0101] In the DC high-voltage liquid-cooling circuit switching system, in order to further improve the safety and reliability of the system, insulation monitoring devices are added, especially at the first output interface and the second output interface.

[0102] These insulation monitoring devices can monitor the insulation status of the output interface in real time, ensure electrical isolation between the wiring harness and the equipment, and effectively prevent safety hazards such as short circuits and electric shocks caused by insulation failure.

[0103] Through precise monitoring and early warning of the insulation monitoring device, the system can promptly detect and handle potential insulation problems, providing a solid safety guarantee for the stable operation of the DC high-voltage liquid-cooled circuit switching system.

[0104] See also Figure 2 , the DC high-voltage liquid cooling circuit switching system is explained.

[0105] like Figure 2 As shown, DC+ is the positive cable, DC- is the negative cable; PE is the ground cable; 220 / 12V is the voltage conversion unit; "AC 220, 10A" is an AC source with an AC voltage of 220V and a current of 10A. S0 and S1 are both single-pole double-throw switches.

[0106] Direct current is output from the positive pole (DC+) and negative pole (DC-) of the DC source and enters the high-voltage switching box through the high-voltage connecting harness. There will be an isolation detection device inside the high-voltage switching box, which electrically isolates and protects the positive and negative poles of the DC. The isolation detection device is powered by 12V. All ground wires (PE) are connected together for common grounding.

[0107] The high voltage switch box DC voltmeter is a device for measuring the power supply voltage and detecting the voltage condition of the wiring harness.

[0108] Direct current reaches the switch device through the wiring harness. The switch device is equipped with a single-pole double-throw switch, which can select the output to be a normal output that supports a maximum of 250A or a liquid-cooled cable that can reach 800A for output; there are insulation monitoring devices at the 250A and 800A output interfaces, which are used to detect insulation safety; the coolant in the liquid-cooled cable is circulated through the liquid cooler, and the coolant in the cable is circulated to achieve the purpose of cooling; the liquid cooler is powered by 12V.

[0109] If the current requirement is only within 300A, a single-pole double-throw switch can be used to switch to an ordinary DC circuit; once a large current such as 800A is required, the ordinary DC circuit cannot meet the demand, and a single-pole double-throw switch can be used to switch to a liquid cooling circuit, and liquid cooling equipment can be used to cool the wiring harness to meet the demand for 800A high current.

[0110] It should be noted that when current passes through the wiring harness, heat will be generated. Generally, the greater the current passing through the wiring harness, the larger the diameter of the wiring harness. When the wiring harness with a smaller wire diameter is subjected to large current or long-distance transmission, it is easy to have safety hazards such as overheating and short circuit. However, liquid-cooled wiring harnesses can use wiring harnesses of the same diameter and continuously cool the wiring harnesses through coolant to achieve stable output.

[0111] The wiring harness between the switch device and the second output interface, and the wiring harness between the second output interface of the liquid cooler can both be liquid cooling wiring harnesses; that is, Figure 2 The blue parts shown are all liquid-cooled harnesses.

[0112] That is, the present application can quickly switch between a test circuit without liquid cooling and a test circuit with liquid cooling.

[0113] Another embodiment of the present application provides a control method for a DC high-pressure liquid cooling circuit switching system, which is applied to a DC high-pressure liquid cooling circuit switching system; the specific structure and working principle of the DC high-pressure liquid cooling circuit switching system are detailed in the DC high-pressure liquid cooling circuit switching system provided in the above embodiment, which will not be described one by one here, and it will depend on the actual situation, which is all within the protection scope of the present application.

[0114] See also Figure 3 , the control method comprises:

[0115] S101. Determine the current requirement of a DC high-voltage liquid cooling circuit switching system.

[0116] When starting or adjusting the working state of the DC high-voltage liquid cooling loop switching system, it is necessary to accurately measure or estimate the current demand of the system. This step is the basis for ensuring that the system can operate stably and provide appropriate power output.

[0117] S102: Determine whether the current demand is greater than a first threshold.

[0118] The first threshold is the upper limit of the current corresponding to the first output interface.

[0119] According to the current demand determined in step S101, the current demand is compared with the preset first threshold value. The first threshold value represents the maximum current value that the first output interface in the system can withstand, which is determined based on the electrical characteristics of the output interface, safety standards, system design requirements and other factors. The first threshold value can be 300A, of course, it can also be other values, which will not be repeated here.

[0120] If the current demand is greater than the first threshold, step S103 is executed. At this time, since the current demand exceeds the carrying capacity of the first output interface, the system needs to switch to the second output interface to ensure safe and stable power output.

[0121] However, if the current demand is not greater than the first threshold, step S104 is executed. At this time, the current demand is within the carrying capacity of the first output interface, and the system can continue to use the first output interface for power output.

[0122] S103, control the switch switching device in the DC high-voltage liquid cooling circuit switching system to be in the second state, so that the high-voltage switching box in the DC high-voltage liquid cooling circuit switching system adopts the second output interface as the output interface, outputs the current corresponding to the current demand through the second output interface, and uses the liquid cooling unit to cool the cable corresponding to the second output interface.

[0123] That is to say, switch to the second output interface: when it is determined that the current demand is greater than the first threshold, the system will control the switch switching device to enter the first state. In this state, the high-voltage switch box will use the second output interface as the output interface to meet the current current demand of the system. And the liquid cooling unit is used to cool the cable corresponding to the second output interface. The design of the second output interface can withstand higher currents, thereby ensuring stable operation of the system under high load.

[0124] S104, controlling the switch switching device in the DC high-pressure liquid cooling circuit switching system to be in the first state, so that the high-voltage switching box in the DC high-pressure liquid cooling circuit switching system adopts the first output interface as the output interface, and outputs the current corresponding to the current demand through the first output interface.

[0125] That is to say, the first output interface is maintained at output: when it is determined that the current demand is not greater than the first threshold, the system controls the switch switching device to enter the second state. In this state, the high-voltage switch box will continue to use the first output interface as the output interface to meet the current demand of the system. This step helps to optimize energy utilization and reduce unnecessary energy loss and equipment wear.

[0126] Through this series of steps, the DC high-voltage liquid-cooled circuit switching system can intelligently select the most suitable output interface according to different current requirements, thereby ensuring the safe, stable and efficient operation of the system. Different output interfaces correspond to different circuits, and the circuit corresponding to the second output interface uses liquid cooling technology for cooling.

[0127] In this embodiment, the current demand of the DC high-voltage liquid-cooling circuit switching system is determined; it is determined whether the current demand is greater than a first threshold value, the first threshold value being the current upper limit corresponding to the first output interface; if so, the switch switching device in the DC high-voltage liquid-cooling circuit switching system is controlled to be in a first state, so that the high-voltage switching box in the DC high-voltage liquid-cooling circuit switching system adopts the second output interface as the output interface, and outputs the current corresponding to the current demand through the second output interface; if not, the switch switching device in the DC high-voltage liquid-cooling circuit switching system is controlled to be in a second state, so that the high-voltage switching box in the DC high-voltage liquid-cooling circuit switching system adopts the first output interface as the output interface, and outputs the current corresponding to the current demand through the first output interface; that is, the high-voltage switching box can switch the output interface according to the current demand, and the second output interface is equipped with a liquid cooling unit, and then the liquid cooling unit can perform liquid cooling when the second output interface is used for output, thereby increasing the current upper limit supported by the high-voltage switching box, and increasing the current range supported by the DC high-voltage liquid-cooling circuit switching system without changing the cable diameter, thereby improving the applicability of the DC high-voltage liquid-cooling circuit switching system.

[0128] The features recorded in the various embodiments in this specification can be replaced or combined with each other, and the same and similar parts between the various embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0129] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0130] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A DC high-voltage liquid cooling circuit switching system, characterized in that: include: DC source, high voltage wiring harness and high voltage switch box; The high-voltage switch box includes: a switch switching device, a first output interface, a second output interface and a liquid cooling unit; The positive and negative electrodes of the input terminals of the switch switching device serve as the positive and negative electrodes of the input terminals of the high-voltage switch box, and are connected to a DC source through a high-voltage wiring harness; The first output end of the switch switching device is connected to the first output interface; the second output end of the switch switching device is connected to the second output interface; When the switch switching device is in the first state, the high-voltage switching box adopts the first output interface to output the current corresponding to the first output interface; when the switch switching device is in the second state, the high-voltage switching box adopts the second output interface to output the current corresponding to the second output interface, and adopts the liquid cooling unit to cool the cable corresponding to the second output interface.

2. The DC high-voltage liquid cooling circuit switching system according to claim 1, characterized in that: The second output interface allows a higher current to be output than the first output interface allows a higher current to be output.

3. The DC high-voltage liquid cooling circuit switching system according to claim 2, characterized in that: The switch switching device comprises: a first switch unit and a second switch unit; The first end of the first switch unit serves as a negative input terminal of the switch switching device; The second end of the first switch unit is connected to the negative pole of the first output interface of the high-voltage switch box; The third end of the first switch unit is connected to the negative pole of the second output interface of the high-voltage switch box; The first end of the second switch unit serves as the positive input terminal of the switch switching device; The second end of the second switch unit is connected to the positive pole of the first output interface of the high-voltage switch box; The third end of the second switch unit is connected to the positive pole of the second output interface of the high-voltage switch box.

4. The DC high-voltage liquid cooling circuit switching system according to claim 3 is characterized in that: The first switch unit and / or the second switch unit both include: a switching unit and a single-pole double-throw switch; The first end of the switching unit serves as the first end of the corresponding switch unit; The second end of the switching unit is connected to the fixed end of the single-pole double-throw switch; The first moving end of the single-pole double-throw switch serves as the second end of the corresponding switch unit; The second moving end of the single-pole double-throw switch serves as the third end of the corresponding switch unit.

5. The DC high-voltage liquid cooling circuit switching system according to claim 3, characterized in that: Also includes: DC voltmeter; The DC voltmeter is arranged between the first switch unit and the second switch unit.

6. The DC high-voltage liquid cooling circuit switching system according to claim 1, characterized in that: The output end of the liquid cooling unit is connected to the second output interface and the second output end of the switch device respectively; and the cable connected to the output end of the liquid cooling unit is a liquid cooling cable.

7. The DC high-voltage liquid cooling circuit switching system according to claim 6, characterized in that: The liquid cooling unit includes: a liquid cooling machine and a voltage conversion unit; The input end of the voltage conversion unit is connected to an AC source; The output end of the voltage conversion unit is connected to the input end of the liquid cooling machine; The output end of the liquid cooling machine is connected to the second output interface through a liquid cooling cable.

8. The DC high-voltage liquid cooling circuit switching system according to claim 7, characterized in that: Also includes: Isolation and testing equipment; The isolation detection device is arranged at the input end of the high-voltage switching box.

9. The DC high-voltage liquid cooling circuit switching system according to claim 2, characterized in that: Also includes insulation monitoring device; The insulation monitoring device is provided at the first output interface and the second output interface in the high-voltage switch box.

10. A control method for a DC high-voltage liquid cooling circuit switching system, characterized in that: Applied to the DC high-voltage liquid cooling circuit switching system according to any one of claims 1 to 9, the control method comprises: Determining the current demand of the DC high-voltage liquid cooling circuit switching system; Determine whether the current demand is greater than a first threshold, where the first threshold is an upper current limit corresponding to the first output interface; If so, control the switch switching device in the DC high-pressure liquid cooling circuit switching system to be in the second state, so that the high-voltage switching box in the DC high-pressure liquid cooling circuit switching system adopts the second output interface as the output interface, and outputs the current corresponding to the current demand through the second output interface; If not, the switch switching device in the DC high-pressure liquid cooling circuit switching system is controlled to be in the first state, so that the high-voltage switching box in the DC high-pressure liquid cooling circuit switching system adopts the first output interface as the output interface, and outputs the current corresponding to the current demand through the first output interface.

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