Thermal management system with condenser self-cleaning function and self-cleaning method thereof

Abstract

The invention discloses a thermal management system with a condenser self-cleaning function and a self-cleaning method thereof, and relates to the technical field of thermal management systems and control methods thereof. When the refrigerant circulation path of the refrigeration module is switched to the second refrigerant circulation loop and the liquid cooling medium circulation path of the liquid cooling module is switched to the second liquid cooling medium circulation loop, the surface of the condenser can be frosted; the refrigerant circulation path of the refrigeration module is switched into the first refrigerant circulation loop, the liquid cooling medium circulation path of the liquid cooling module is switched into the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop which are communicated with each other in a parallel connection mode, and frost on the surface of the condenser can be melted. The invention mainly solves the problem of how to provide a heat management system with a condenser self-cleaning function. Self-cleaning of the condenser can be achieved, so that the filth blockage fault of the condenser is prevented and eliminated, and normal operation of a heat management system and an energy storage system is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management systems and control methods thereof, and in particular to a thermal management system with a condenser self-cleaning function and a self-cleaning method thereof. Background Art

[0002] An energy storage system is a system used to store and release electrical energy. It involves the conversion between electrical energy and chemical energy, as well as the conversion between electrical energy and electrical energy. In the above process, a lot of heat will be generated. If the heat cannot be discharged in time, the temperature of the energy storage system will rise, bringing safety hazards, and thus affecting the performance, life and normal operation of the energy storage system.

[0003] In order to control the temperature of the energy storage system and improve the charging and discharging efficiency of the energy storage system, a thermal management system needs to be configured in the energy storage system to dissipate heat for the energy storage system.

[0004] Among them, the heat dissipation system using phase change refrigeration technology is the most widely used thermal management system solution. The above-mentioned heat dissipation system using phase change refrigeration technology usually includes a compressor, a condenser, an expansion valve, an evaporator and a refrigerant pipe connecting the above-mentioned components.

[0005] With the long-term operation of the energy storage system and the thermal management system, the condenser that is in contact with the air for a long time and exchanges heat has a high probability of becoming dirty and blocked (such as dust and oil accumulation), which will obviously affect the heat exchange performance of the condenser, and then affect the overall efficiency of the thermal management system, causing the thermal management system and the energy storage system to experience performance degradation and shutdown and other failures.

[0006] The thermal management system in the prior art needs to rely on manual cleaning when the condenser is dirty and blocked, which obviously consumes a lot of labor costs, has low efficiency and high delay rate.

[0007] In summary, how to provide a thermal management system with a condenser self-cleaning function and a self-cleaning method thereof has become one of the problems to be solved urgently. Summary of the invention

[0008] The object of the present invention is to provide a thermal management system with a condenser self-cleaning function and a self-cleaning method thereof, which can realize the self-cleaning of the condenser to prevent and eliminate the condenser dirt blockage fault.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a thermal management system with a condenser self-cleaning function, comprising a refrigeration module and a liquid cooling module; the refrigeration module comprises a compressor, a condenser with forced convection by a fan, a first throttling device, a second throttling device and an evaporative heat exchanger, and the refrigeration module can selectively constitute any one of a first refrigerant circulation loop and a second refrigerant circulation loop; the refrigerant circulation path of the first refrigerant circulation loop is, in sequence: the compressor, the condenser, the first throttling device, the refrigerant channel of the evaporative heat exchanger and the second throttling device; the refrigerant circulation path of the second refrigerant circulation loop is, in sequence: the compressor, the refrigerant channel of the evaporative heat exchanger, the first throttling device and the condenser; the liquid cooling module comprises a main circulation pump, a liquid cooling heat exchanger and a heat sink with forced convection by a fan, and the liquid cooling module constitutes a first liquid cooling medium circulation loop and a second liquid cooling medium circulation loop; The liquid-cooling medium circulation path of the first liquid-cooling medium circulation loop is, in sequence: the main circulation pump, the liquid-cooling medium channel of the evaporative heat exchanger, and the liquid-cooling heat exchanger; the liquid-cooling medium circulation path of the second liquid-cooling medium circulation loop is, in sequence: the main circulation pump, the liquid-cooling medium channel of the evaporative heat exchanger, and the heat dissipation water tank; and the first liquid-cooling medium circulation loop and the second liquid-cooling medium circulation loop can be selectively interconnected in parallel; when the refrigerant circulation path of the refrigeration module is switched to the second refrigerant circulation loop, and the liquid-cooling medium circulation path of the liquid-cooling module is switched to the second liquid-cooling medium circulation loop, frost can be formed on the surface of the condenser; when the refrigerant circulation path of the refrigeration module is switched to the first refrigerant circulation loop, and the liquid-cooling medium circulation path of the liquid-cooling module is switched to the first liquid-cooling medium circulation loop and the second liquid-cooling medium circulation loop which are interconnected in parallel, frost on the surface of the condenser can be melted.

[0010] In the above technical solution, the refrigeration module also includes a first refrigerant stop valve, a second refrigerant stop valve and a third refrigerant stop valve; the first refrigerant stop valve is connected between the output end of the compressor and the condenser, the second refrigerant stop valve is connected between the output end of the compressor and the refrigerant channel of the evaporative heat exchanger, and the third refrigerant stop valve is connected between the input end of the compressor and the condenser; when the refrigeration module constitutes the first refrigerant circulation loop, the first refrigerant stop valve is opened, the second refrigerant stop valve and the third refrigerant stop valve are closed, and the refrigerant circulation path of the first refrigerant circulation loop is sequentially: the compressor, the first refrigerant stop valve, the condenser, the first throttling device, the refrigerant channel of the evaporative heat exchanger and the second throttling device; when the refrigeration module constitutes the second refrigerant circulation loop, the first refrigerant stop valve is closed, the second refrigerant stop valve and the third refrigerant stop valve are opened, and the refrigerant circulation path of the second refrigerant circulation loop is sequentially: the compressor, the second refrigerant stop valve, the refrigerant channel of the evaporative heat exchanger, the first throttling device, the condenser and the third refrigerant stop valve.

[0011] In the above technical solution, the liquid cooling module also includes a liquid cooling medium shut-off valve; the liquid cooling medium shut-off valve is connected at the connection node between the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop, and is used to open or shut off the connection node between the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop.

[0012] In the above technical solution, the liquid cooling module also includes a liquid cooling medium proportional valve; the liquid cooling medium proportional valve is connected to any node of the second liquid cooling medium circulation loop, and is used to adjust the liquid cooling medium flow rate of the second liquid cooling medium circulation loop.

[0013] In the above technical solution, the liquid cooling module also includes a heater; the heater is connected before the input end of the liquid cooling heat exchanger and is used to heat the liquid cooling medium.

[0014] In the above technical solution, the liquid cooling module also includes a liquid outlet temperature sensor T1 and a liquid inlet temperature sensor T2; the liquid outlet temperature sensor T1 is connected to the output end of the cooling water tank, and is used to detect the liquid outlet temperature of the cooling water tank; the liquid inlet temperature sensor T2 is connected to the input end of the cooling water tank, and is used to detect the liquid inlet temperature of the cooling water tank.

[0015] In the above technical solution, the refrigeration module also includes a condenser inlet pressure sensor P1, a compressor inlet pressure sensor P2 and a compressor inlet temperature sensor T3; the condenser inlet pressure sensor P1 is connected to the input end of the condenser, and is used to detect the refrigerant pressure at the input end of the condenser; the compressor inlet pressure sensor P2 is connected to the input end of the compressor, and is used to detect the refrigerant input pressure of the compressor; the compressor inlet temperature sensor T3 is connected to the input end of the compressor, and is used to detect the refrigerant input temperature of the compressor.

[0016] A condenser self-cleaning method for a thermal management system is applied to the above-mentioned thermal management system with a condenser self-cleaning function, and the method comprises:

[0017] S1. After the thermal management system is put into operation, a preset time is counted. When the preset time is reached, or when a condenser fouling failure occurs in the thermal management system, step S2 is entered;

[0018] S2, detecting the ambient temperature and the ambient humidity. If both the ambient temperature and the ambient humidity meet the preset frost determination threshold, then proceeding to step S3. If either the ambient temperature or the ambient humidity does not meet the preset frost determination threshold, then waiting for a sampling time period and then proceeding to step S2 again.

[0019] S3, putting both the refrigeration module and the liquid cooling module into shutdown state;

[0020] S4, switching the refrigerant circulation path of the refrigeration module to the second refrigerant circulation loop, switching the liquid cooling medium circulation path of the liquid cooling module to the second liquid cooling medium circulation loop, and adjusting the liquid cooling medium flow rate of the second liquid cooling medium circulation loop to the maximum, starting the compressor of the refrigeration module, starting the main circulation pump of the liquid cooling module, and starting the fan to perform forced convection for the condenser of the refrigeration module and / or the evaporative heat exchanger of the liquid cooling module;

[0021] S5, gradually increasing the speed of the compressor until it reaches full speed, so that frost forms on the surface of the condenser;

[0022] S6, putting the refrigeration module and the liquid cooling module into a shutdown state again;

[0023] S7, switching the refrigerant circulation path of the refrigeration module to the first refrigerant circulation loop, switching the liquid cooling medium circulation path of the liquid cooling module to the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop interconnected in parallel, and adjusting the liquid cooling medium flow rate of the second liquid cooling medium circulation loop to the maximum, starting the compressor of the refrigeration module, starting the main circulation pump of the liquid cooling module, and starting the fan to perform forced convection for the condenser of the refrigeration module and / or the evaporative heat exchanger of the liquid cooling module;

[0024] S8, gradually increasing the speed of the compressor until it reaches full speed, and setting the fan and the main circulation pump of the liquid cooling module to full speed to melt the frost on the surface of the condenser;

[0025] S9, putting the refrigeration module and the liquid cooling module into a shutdown state again;

[0026] S10, restore the normal operation status of the refrigeration module and the liquid cooling module, and determine whether the dirt blockage of the condenser has been eliminated. If the dirt blockage of the condenser has been eliminated, maintain the normal operation status of the refrigeration module and the liquid cooling module, and re-enter step S1; if the dirt blockage of the condenser has not been eliminated, re-enter step S2.

[0027] In the above technical solution, after step S5, the method further includes:

[0028] When the following conditions are met at the same time, the condenser is judged to have been sufficiently frosted on the surface, and the process proceeds to step S6:

[0029] a. The pressure value fed back by the condenser inlet pressure sensor P1 is lower than a preset first threshold;

[0030] b. The temperature difference between the inlet temperature fed back by the inlet temperature sensor T2 and the outlet temperature of the outlet temperature sensor T1 is lower than a preset second threshold;

[0031] c. The opening degree of the first throttling device is higher than a preset third threshold value.

[0032] In the above technical solution, in step S10, it is determined whether the dirt blockage of the condenser has been eliminated, and the specific method is:

[0033] When the following conditions are met at the same time, the condenser is considered to have been cleared of dirt and blockage:

[0034] a. The pressure value fed back by the condenser inlet pressure sensor P1 is compared with the historical operation data / initial preset data, and the difference is within a preset fourth threshold;

[0035] b. The pressure value fed back by the compressor inlet pressure sensor P2 is compared with the historical operation data / initial preset data, and the difference is within the preset fifth threshold;

[0036] c. The temperature value fed back by the compressor inlet temperature sensor T3 is compared with the historical operation data / initial preset data, and the difference is within a preset sixth threshold.

[0037] Compared with the prior art, the present invention has the following beneficial effects: the thermal management system with condenser self-cleaning function and the self-cleaning method thereof of the present invention can make the condenser surface frosted when the refrigerant circulation path of the refrigeration module is switched to the second refrigerant circulation loop, and the liquid-cooling medium circulation path of the liquid-cooling module is switched to the second liquid-cooling medium circulation loop; the refrigerant circulation path of the refrigeration module is switched to the first refrigerant circulation loop, and the liquid-cooling medium circulation path of the liquid-cooling module is switched to the first liquid-cooling medium circulation loop and the second liquid-cooling medium circulation loop interconnected in parallel, so that the frost on the condenser surface can be melted; when the condenser surface is frosted, Frost can fill the gaps between the fins of the condenser and rub against pollutants such as dust and oil, thereby reducing the adhesion of the pollutants. When the frost on the surface of the condenser melts, it can carry the pollutants away from the condenser, thereby achieving self-cleaning of the condenser. The present invention can achieve self-cleaning of the condenser to prevent and eliminate condenser blockage failures, save labor costs, and reduce the delay rate when troubleshooting condenser blockage failures, thereby ensuring the normal operation of the thermal management system and the energy storage system, and the self-cleaning method can be implemented directly by relying on the components of the thermal management system itself, without the need to add components to the thermal management system, thereby reducing the cost and complexity of the thermal management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a system structure diagram of the present invention.

[0039] Figure 2 It is a flow chart of the steps of the present invention.

[0040] Figure 3 It is a schematic diagram of the circulation flow direction in step S4 and step S5 of the present invention.

[0041] Figure 4 It is a schematic diagram of the circulation flow direction in step S7 and step S8 of the present invention.

[0042] The accompanying drawings are marked as follows: 1. compressor; 2. condenser; 3. fan; 4. first throttling device; 5. second throttling device; 6. evaporative heat exchanger; 7. first refrigerant stop valve; 8. second refrigerant stop valve; 9. third refrigerant stop valve; P1. condenser inlet pressure sensor; P2. compressor inlet pressure sensor; T3. compressor inlet temperature sensor; 10. main circulation pump; 11. liquid-cooled heat exchanger; 12. liquid-cooled medium stop valve; 13. heat sink; 14. liquid-cooled medium proportional valve; 15. heater; T1. liquid outlet temperature sensor; T2. liquid inlet temperature sensor; 100. functional device. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0044] This embodiment provides a thermal management system with a condenser self-cleaning function, which can provide thermal management functions such as heat dissipation and heat preservation for various functional devices; as a typical case, in this embodiment, the battery pack in the energy storage system is used as the functional device 100 to specifically illustrate the technical solution of the present invention.

[0045] See also Figure 1 The thermal management system with condenser self-cleaning function of this embodiment includes a refrigeration module and a liquid cooling module.

[0046] The refrigeration module includes a compressor 1 , a condenser 2 with a fan 3 for forced convection, a first throttling device 4 , a second throttling device 5 and an evaporative heat exchanger 6 .

[0047] Among them, the compressor 1 is a compressor used to compress refrigerant in the refrigeration system, specifically a variable frequency compressor; the condenser 2 is a condenser in the refrigeration system, that is, the self-cleaning object in this embodiment, which dissipates heat through its own fan 3, and the fan 3 is a precision electronic fan that can control and feedback its rotation speed; the first throttling device 4 and the second throttling device 5 are both throttling devices in the refrigeration system. In this embodiment, the first throttling device 4 and the second throttling device 5 are both electronic expansion valves, which can be controlled by the host computer to open / close and adjust the opening; the evaporative heat exchanger 6 is used for heat exchange between the refrigeration module and the liquid cooling module. In most cases, the evaporative heat exchanger 6 is a plate heat exchanger, which has a refrigerant channel and a liquid cooling medium channel.

[0048] The refrigeration module can selectively constitute either a first refrigerant circulation circuit or a second refrigerant circulation circuit.

[0049] The refrigerant circulation path of the first refrigerant circulation loop is, in sequence: the compressor 1 , the condenser 2 , the first throttling device 4 , the refrigerant channel of the evaporative heat exchanger 6 , and the second throttling device 5 .

[0050] The refrigerant circulation path of the second refrigerant circulation loop is, in sequence: the compressor 1 , the refrigerant channel of the evaporative heat exchanger 6 , the first throttling device 4 and the condenser 2 .

[0051] The liquid cooling module includes a main circulation pump 10 , a liquid cooling heat exchanger 11 , and a heat dissipation water tank 13 with forced convection by a fan 3 .

[0052] Among them, the main circulation pump 10 is a liquid pump capable of driving the flow of liquid cooling medium, such as an electronic water pump; the liquid cooling heat exchanger 11 is a metal plate with good thermal conductivity and an internal flow channel, which is suitable for being attached / built-in to the heating element. In this embodiment, the liquid cooling heat exchanger 11 exchanges heat with the functional device 100 (i.e., the battery pack in the energy storage system); the heat dissipation water tank 13 is a metal radiator having multiple liquid flow channels, and heat dissipation fins are arranged between each liquid flow channel. It can dissipate heat for the liquid cooling medium flowing through it by forced convection or natural convection. In this embodiment, the condenser 2 of the refrigeration module and the heat dissipation water tank 13 of the liquid cooling module share a group of fans 3 (for example, 2-3 fans 3 arranged in parallel); in other embodiments, the condenser 2 of the refrigeration module and the heat dissipation water tank 13 of the liquid cooling module can also be each configured with an independent group of fans.

[0053] The liquid cooling module forms a first liquid cooling medium circulation loop and a second liquid cooling medium circulation loop.

[0054] The liquid cooling medium circulation path of the first liquid cooling medium circulation loop is, in sequence: the main circulation pump 10 , the liquid cooling medium channel of the evaporative heat exchanger 6 , and the liquid cooling heat exchanger 11 .

[0055] The liquid cooling medium circulation path of the second liquid cooling medium circulation loop is: the main circulation pump 10 , the liquid cooling medium channel of the evaporative heat exchanger 6 , and the heat dissipation water tank 13 in sequence.

[0056] Furthermore, the first liquid-cooling medium circulation circuit and the second liquid-cooling medium circulation circuit can be selectively connected to each other in parallel.

[0057] When the refrigerant circulation path of the refrigeration module is switched to the second refrigerant circulation loop, and the liquid cooling medium circulation path of the liquid cooling module is switched to the second liquid cooling medium circulation loop, frost can be formed on the surface of the condenser 2 .

[0058] Switching the refrigerant circulation path of the refrigeration module to the first refrigerant circulation loop, and switching the liquid cooling medium circulation path of the liquid cooling module to the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop interconnected in parallel can melt the frost on the surface of the condenser 2.

[0059] Specifically, the refrigeration module also includes a first refrigerant stop valve 7, a second refrigerant stop valve 8 and a third refrigerant stop valve 9, wherein the first refrigerant stop valve 7, the second refrigerant stop valve 8 and the third refrigerant stop valve 9 are all refrigerant-specific stop valves in the refrigeration system, and can be controlled by the host computer to open / close; the first refrigerant stop valve 7 is connected between the output end of the compressor 1 (specifically the output end based on the refrigerant forward cycle) and the condenser 2, the second refrigerant stop valve 8 is connected between the output end of the compressor 1 (specifically the output end based on the refrigerant forward cycle) and the refrigerant channel of the evaporative heat exchanger 6, and the third refrigerant stop valve 9 is connected between the input end of the compressor 1 (specifically the input end based on the refrigerant forward cycle) and the condenser 2.

[0060] When the refrigeration module forms the first refrigerant circulation loop, the first refrigerant stop valve 7 is opened, the second refrigerant stop valve 8 and the third refrigerant stop valve 9 are closed, and the refrigerant circulation path of the first refrigerant circulation loop is: compressor 1, first refrigerant stop valve 7, condenser 2, first throttling device 4, refrigerant channel of evaporative heat exchanger 6 and second throttling device 5.

[0061] When the refrigeration module forms the second refrigerant circulation loop, the first refrigerant stop valve 7 is closed, the second refrigerant stop valve 8 and the third refrigerant stop valve 9 are opened, and the refrigerant circulation path of the second refrigerant circulation loop is: compressor 1, second refrigerant stop valve 8, refrigerant channel of evaporative heat exchanger 6, first throttling device 4, condenser 2 and third refrigerant stop valve 9.

[0062] Specifically, the liquid cooling module also includes a liquid cooling medium stop valve 12, wherein the liquid cooling medium stop valve 12 is a liquid stop valve, such as an electronic water valve, which can be controlled by the host computer to open / close; the liquid cooling medium stop valve 12 is connected to the connection node between the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop, and is used to open or cut off the connection node between the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop; in this embodiment, one end of the liquid cooling medium stop valve 12 is connected to the liquid cooling medium input end of the liquid cooling heat exchanger 11 (located in the first liquid cooling medium circulation loop), and the other end is connected to the second liquid cooling medium circulation loop.

[0063] Furthermore, the liquid cooling module also includes a liquid cooling medium proportional valve 14, wherein the liquid cooling medium proportional valve 14 is a liquid proportional valve, such as an electronic proportional valve, which can be controlled by the host computer to open / close and adjust the opening ratio; the liquid cooling medium proportional valve 14 is connected at any node of the second liquid cooling medium circulation loop, and is used to adjust the liquid cooling medium flow rate of the second liquid cooling medium circulation loop; in this embodiment, the liquid cooling medium proportional valve 14 is connected to the front side of the input end of the heat dissipation water tank 13.

[0064] Furthermore, the liquid cooling module also includes a heater 15, wherein the heater 15 is an electric liquid heater 15, which is used to prevent the temperature of the liquid cooling medium from being too low, and can be controlled by the host computer to turn on / off and adjust the heating power; the heater 15 is connected before the input end of the liquid cooling heat exchanger 11, and is used to heat the liquid cooling medium.

[0065] Furthermore, the liquid cooling module also includes a liquid outlet temperature sensor T1 and a liquid inlet temperature sensor T2, wherein the liquid outlet temperature sensor T1 and the liquid inlet temperature sensor T2 are both water temperature sensors dedicated to the liquid cooling unit, and both can feedback the temperature of the liquid cooling medium to the host computer; the liquid outlet temperature sensor T1 is connected to the output end of the heat dissipation water tank 13, and is used to detect the liquid outlet temperature of the heat dissipation water tank 13; the liquid inlet temperature sensor T2 is connected to the input end of the heat dissipation water tank 13, and is used to detect the liquid inlet temperature of the heat dissipation water tank 13.

[0066] Furthermore, the refrigeration module also includes a condenser inlet pressure sensor P1, a compressor inlet pressure sensor P2 and a compressor inlet temperature sensor T3; wherein, the condenser inlet pressure sensor P1 and the compressor inlet pressure sensor P2 are both refrigerant-specific pressure sensors in the refrigeration system, and both can feedback the refrigerant pressure to the host computer; the compressor inlet temperature sensor T3 is a refrigerant-specific temperature sensor in the refrigeration system, and both can feedback the refrigerant temperature to the host computer; the condenser inlet pressure sensor P1 is connected to the input end of the condenser 2, and is used to detect the refrigerant pressure of the input end of the condenser 2 (specifically, the input end based on the forward circulation of the refrigerant, when the refrigerant is reversely circulated, the input end should be regarded as the output end); the compressor inlet pressure sensor P2 is connected to the input end of the compressor 1, and is used to detect the refrigerant input pressure of the compressor 1; the compressor inlet temperature sensor T3 is connected to the input end of the compressor 1, and is used to detect the refrigerant input temperature of the compressor 1.

[0067] An outlet liquid temperature sensor T1 and an inlet liquid temperature sensor T2 are provided to respectively provide feedback on the outlet liquid temperature and inlet liquid temperature of the cooling water tank 13 to the host computer; a condenser inlet pressure sensor P1 is provided to provide feedback on the refrigerant pressure of the input end of the condenser 2 (specifically, the input end based on the forward circulation of the refrigerant, and when the refrigerant circulates in reverse, the input end should be regarded as the output end); a compressor inlet pressure sensor P2 and a compressor inlet temperature sensor T3 are provided to respectively provide feedback on the refrigerant input pressure and the refrigerant input temperature of the compressor 1 to the host computer; in this way, closed-loop control of the thermal management system is realized.

[0068] It can be understood that the thermal management system with condenser self-cleaning function of this embodiment is configured with a host computer (such as an industrial control computer, a programmable controller, a thermal management system dedicated controller and an embedded system, etc.); the first throttling device 4, the second throttling device 5, the first refrigerant stop valve 7, the second refrigerant stop valve 8, the third refrigerant stop valve 9, the fan 3, the liquid cooling medium stop valve 12 and the actuator of the liquid cooling medium proportional valve 14 are all connected to the host computer through a universal input / output interface or a communication interface to achieve signal connection with the host computer to control the operation of the above components; the condenser inlet pressure sensor P1, the compressor inlet pressure sensor P2, the compressor inlet temperature sensor T3, the liquid outlet temperature sensor T1 and the liquid inlet temperature sensor T2 are connected to the host computer through a universal input / output interface, an analog interface or a communication interface.

[0069] See also Figure 2 This embodiment also provides a condenser self-cleaning method for a thermal management system, which is applied to the above-mentioned thermal management system with a condenser self-cleaning function, and the method includes:

[0070] S1. After the thermal management system is put into operation, a preset time is counted. When the preset time is reached, or when a condenser 2 is blocked by dirt in the thermal management system, the process proceeds to step S2.

[0071] In this step, timing can be achieved through the built-in timer program of the host computer, and the preset time can be set manually through experience summary (i.e. summarizing the time period experience when condenser 2 has a high probability of being dirty and blocked); when a condenser 2 is dirty and blocked, the thermal management system may detect it through manual inspection. During automatic judgment, the pressure value fed back by the condenser inlet pressure sensor P1, the pressure value fed back by the compressor inlet pressure sensor P2, and the temperature value fed back by the compressor inlet temperature sensor T3 may be compared with the historical operating data / initial preset data. If the difference exceeds a certain threshold (the threshold is also set manually through experience summary), it is determined that a condenser 2 is dirty and blocked.

[0072] S2, detecting the ambient temperature and the ambient humidity. If both the ambient temperature and the ambient humidity meet the preset frost determination threshold, proceed to step S3. If either the ambient temperature or the ambient humidity does not meet the preset frost determination threshold, wait for a sampling time period and then proceed to step S2 again.

[0073] In this step, the detection of ambient temperature and humidity can be achieved by installing temperature sensors and humidity sensors near the energy storage system, in the thermal management system accessories, or in the computer room / chassis. Both the temperature sensor and the humidity sensor are connected to the host computer through an analog output interface or a communication interface to achieve signal connection, thereby realizing the detection and transmission of ambient temperature and humidity.

[0074] In this step, the frost judgment threshold is also specifically set manually through experience summary, that is, a series of ambient temperatures and ambient humidity at which the refrigeration system can successfully complete frosting is summarized, and a table / curve is formed and built into the host computer. The host computer determines whether the preset frost judgment threshold is met based on the current ambient temperature and ambient humidity (for example, whether the ambient temperature and ambient humidity fall within the range of the aforementioned table, or whether the ambient temperature and ambient humidity fit the aforementioned curve, etc.). If the ambient temperature / ambient humidity does not meet the preset frost judgment threshold, it is necessary to continue waiting (that is, wait for a sampling time period, such as 8 hours, 12 hours or 24 hours, etc.) until an ambient temperature and ambient humidity suitable for frosting are obtained.

[0075] S3. Put both the refrigeration module and the liquid cooling module into shutdown state.

[0076] In this step, specifically, the first throttling device 4, the second throttling device 5, the first refrigerant stop valve 7, the second refrigerant stop valve 8 and the third refrigerant stop valve 9 of the refrigeration module are all placed in the cut-off state, the compressor 1 of the refrigeration module gradually reduces the speed until it stops, the liquid cooling medium stop valve 12 and the liquid cooling medium proportional valve 14 of the liquid cooling module are both placed in the cut-off state, the main circulation pump 10 of the liquid cooling module gradually reduces the speed until it stops, and the fan 3 of the condenser 2 and the heat sink 13 are turned off.

[0077] (like Figure 3 (as shown) S4, switching the refrigerant circulation path of the refrigeration module to the second refrigerant circulation loop, switching the liquid cooling medium circulation path of the liquid cooling module to the second liquid cooling medium circulation loop, and adjusting the liquid cooling medium flow rate of the second liquid cooling medium circulation loop to the maximum, starting the compressor 1 of the refrigeration module, starting the main circulation pump 10 of the liquid cooling module, and starting the fan 3 to perform forced convection for the condenser 2 of the refrigeration module and / or the evaporative heat exchanger 6 of the liquid cooling module.

[0078] In this step, the refrigerant circulation path of the refrigeration module is switched to the second refrigerant circulation loop, specifically, the first refrigerant stop valve 7 is closed, and the second refrigerant stop valve 8 and the third refrigerant stop valve 9 are opened, so that the refrigerant circulation path is: compressor 1, second refrigerant stop valve 8, refrigerant channel of evaporative heat exchanger 6, first throttling device 4, condenser 2 and third refrigerant stop valve 9 in sequence; the liquid-cooling medium circulation path of the liquid-cooling module is switched to the second liquid-cooling medium circulation loop, specifically, the liquid-cooling medium stop valve 12 is closed to cut off the connection node between the first liquid-cooling medium circulation loop and the second liquid-cooling medium circulation loop, so that the first liquid-cooling medium circulation loop is cut out of the liquid-cooling medium circulation path in a bypass manner. At this time, the liquid-cooling medium circulation path is: main circulation pump 10, liquid-cooling medium channel of evaporative heat exchanger 6, heater 15, liquid-cooling medium proportional valve 14 and heat sink 13; the liquid-cooling medium flow rate of the second liquid-cooling medium circulation loop is adjusted to the maximum, specifically, the opening of the liquid-cooling medium proportional valve 14 of the liquid-cooling module is adjusted to the maximum.

[0079] S5. Gradually increase the rotation speed of the compressor 1 until it reaches full speed, so that frost forms on the surface of the condenser 2.

[0080] In this step, the speed of the fan 3 can be comprehensively controlled based on the pressure value fed back by the condenser inlet pressure sensor P1 (at this time, for the condenser 2, it belongs to the refrigerant reverse circulation process, so the pressure value fed back by the condenser inlet pressure sensor P1 is actually the refrigerant output pressure of the condenser 2), the outlet liquid temperature and inlet liquid temperature of the heat sink 13 fed back by the outlet liquid temperature sensor T1 and the inlet liquid temperature sensor T2.

[0081] Since step S4 and step S5 belong to the refrigerant reverse circulation process, the condenser 2 will be frosted, but at the same time the evaporative heat exchanger 6 will have a larger heating value, so the first liquid cooling medium circulation loop needs to operate to dissipate heat to the evaporative heat exchanger 6 through the heat dissipation water tank 13; in addition, the first liquid cooling medium circulation loop is cut out of the liquid cooling medium circulation path in a bypass manner, so the liquid cooling heat exchanger 11 of the functional device 100 does not participate in the liquid cooling medium circulation, and the functional device 100 will not be heated.

[0082] S6. Put the refrigeration module and the liquid cooling module into the shutdown state again.

[0083] In this step, specifically, the first throttling device 4, the second throttling device 5, the first refrigerant stop valve 7, the second refrigerant stop valve 8 and the third refrigerant stop valve 9 of the refrigeration module are all placed in the cut-off state, the compressor 1 of the refrigeration module gradually reduces the speed until it stops, the liquid cooling medium stop valve 12 and the liquid cooling medium proportional valve 14 of the liquid cooling module are both placed in the cut-off state, the main circulation pump 10 of the liquid cooling module gradually reduces the speed until it stops, and the fan 3 of the condenser 2 and the heat sink 13 are turned off.

[0084] (like Figure 4 (as shown) S7, switching the refrigerant circulation path of the refrigeration module to the first refrigerant circulation loop, switching the liquid-cooling medium circulation path of the liquid-cooling module to the first liquid-cooling medium circulation loop and the second liquid-cooling medium circulation loop interconnected in parallel, and adjusting the liquid-cooling medium flow rate of the second liquid-cooling medium circulation loop to the maximum, starting the compressor 1 of the refrigeration module, starting the main circulation pump 10 of the liquid-cooling module, and starting the fan 3 to perform forced convection for the condenser 2 of the refrigeration module and / or the evaporative heat exchanger 6 of the liquid-cooling module.

[0085] In this step, the refrigerant circulation path of the refrigeration module is switched to the first refrigerant circulation loop, specifically, the first refrigerant stop valve 7 is opened, and the second refrigerant stop valve 8 and the third refrigerant stop valve 9 are closed, so that the refrigerant circulation path is: compressor 1, first refrigerant stop valve 7, condenser 2, first throttling device 4, refrigerant channel of evaporative heat exchanger 6 and second throttling device 5; the liquid cooling medium circulation path of the liquid cooling module is switched to the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop which are interconnected in parallel, specifically, the liquid cooling medium stop valve 12 is opened to open the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop. The connection node between the cold medium circulation loops enables the first liquid cooling medium circulation loop to be cut into the liquid cooling medium circulation loop in a bypass manner. At this time, the liquid cooling medium circulation path is: a, main circulation pump 10, liquid cooling medium channel of evaporative heat exchanger 6, heater 15, liquid cooling medium proportional valve 14 and heat dissipation water tank 13; b, main circulation pump 10, liquid cooling medium channel of evaporative heat exchanger 6, heater 15, liquid cooling medium stop valve 12 and liquid cooling heat exchanger 11; adjust the liquid cooling medium flow rate of the second liquid cooling medium circulation loop to the maximum, specifically, adjust the opening of the liquid cooling medium proportional valve 14 of the liquid cooling module to the maximum.

[0086] S8. Gradually increase the rotation speed of the compressor 1 until it reaches full speed, and set the fan 3 and the main circulation pump 10 of the liquid cooling module to full speed to melt the frost on the surface of the condenser 2.

[0087] S9, put the refrigeration module and the liquid cooling module into the shutdown state again.

[0088] In this step, specifically, the first throttling device 4, the second throttling device 5, the first refrigerant stop valve 7, the second refrigerant stop valve 8 and the third refrigerant stop valve 9 of the refrigeration module are all placed in the cut-off state, the compressor 1 of the refrigeration module gradually reduces the speed until it stops, the liquid cooling medium stop valve 12 and the liquid cooling medium proportional valve 14 of the liquid cooling module are both placed in the cut-off state, the main circulation pump 10 of the liquid cooling module gradually reduces the speed until it stops, and the fan 3 of the condenser 2 and the heat sink 13 are turned off.

[0089] S10, restore the normal operation state of the refrigeration module and the liquid cooling module, and determine whether the dirt blockage of the condenser 2 has been eliminated. If the dirt blockage of the condenser 2 has been eliminated, maintain the normal operation state of the refrigeration module and the liquid cooling module, and re-enter step S1; if the dirt blockage of the condenser 2 has not been eliminated, re-enter step S2.

[0090] Furthermore, after step S5, the method further includes:

[0091] When the following conditions are met at the same time, the condenser 2 is judged to have been sufficiently frosted on the surface, and the process proceeds to step S6:

[0092] a. The pressure value fed back by the condenser inlet pressure sensor P1 is lower than the preset first threshold;

[0093] b. The temperature difference between the inlet temperature fed back by the inlet temperature sensor T2 and the outlet temperature fed back by the outlet temperature sensor T1 is lower than a preset second threshold;

[0094] c. The opening degree of the first throttling device 4 is higher than a preset third threshold value.

[0095] Since step S4 and step S5 belong to the refrigerant reverse circulation process, the refrigerant evaporates in the condenser 2. The condenser 2 with a fully frosted surface has a low temperature, and it is difficult for the refrigerant to fully evaporate in the condenser 2. Therefore, the pressure value fed back by the condenser inlet pressure sensor P1 (i.e., the refrigerant output pressure of the condenser 2) will decrease. Whether the pressure value fed back by the condenser inlet pressure sensor P1 is lower than a preset first threshold (the first threshold is artificially set through experience summary) can be used as one of the judgment conditions for whether the surface of the condenser 2 is fully frosted.

[0096] The condenser 2, whose surface is fully frosted, has a low temperature (and is difficult to cool down further), so it is difficult for the evaporative heat exchanger 6 to heat up further, that is, the heat generation of the evaporative heat exchanger 6 will be reduced. Therefore, the heat dissipation pressure of the heat dissipation water tank 13 will be relieved. Whether the temperature difference between the inlet temperature fed back by the inlet temperature sensor T2 and the outlet temperature of the outlet temperature sensor T1 is lower than a preset second threshold (the second threshold is artificially set through experience summary) can be used as one of the judgment conditions for whether the surface of the condenser 2 is fully frosted.

[0097] The condenser 2, whose surface is fully frosted, has a lower temperature, and it is difficult for the refrigerant to fully evaporate in the condenser 2, so the refrigerant is maintained in a high pressure state, making the opening of the first throttling device 4 higher. Therefore, whether the opening of the first throttling device 4 is higher than a preset third threshold value (the third threshold value is artificially set through experience summary) can be used as one of the judgment conditions for whether the surface of the condenser 2 is fully frosted.

[0098] Through this step, reasonable judgment conditions are provided for whether the surface of the condenser 2 is sufficiently frosted, thereby realizing feedback control and enabling the condenser 2 to complete self-cleaning more fully.

[0099] Furthermore, in step S10, it is determined whether the dirt blockage of the condenser 2 has been eliminated, and the specific method is as follows:

[0100] When the following conditions are met at the same time, the dirty blockage of condenser 2 is determined to have been eliminated:

[0101] a. The pressure value fed back by the condenser inlet pressure sensor P1 is compared with the historical operation data / initial preset data, and the difference is within the preset fourth threshold;

[0102] b. The pressure value fed back by the compressor inlet pressure sensor P2 is compared with the historical operation data / initial preset data, and the difference is within the preset fifth threshold;

[0103] c. The temperature value fed back by the compressor inlet temperature sensor T3 is compared with the historical operating data / initial preset data, and the difference is within the preset sixth threshold value.

[0104] When the condenser 2 is clean, it is obvious that the operating state of the thermal management system is better. At this time, the pressure value fed back by the condenser inlet pressure sensor P1, the pressure value fed back by the compressor inlet pressure sensor P2, and the temperature value fed back by the compressor inlet temperature sensor T3 are recorded as historical operating data. Alternatively, the manufacturer obtains initial preset data based on experience summary and embeds the historical operating data / initial preset data into the host computer; the above-mentioned fourth threshold, fifth threshold and sixth threshold are all set manually through experience summary.

[0105] After executing step S9, if the pressure value fed back by the condenser inlet pressure sensor P1, the pressure value fed back by the compressor inlet pressure sensor P2, and the temperature value fed back by the compressor inlet temperature sensor T3 are compared with the historical operating data / initial preset data, and the difference is within the fourth threshold, the fifth threshold, and the sixth threshold respectively, then it is considered that the operating state of the thermal management system has been restored to a good state, and the dirt and blockage of the condenser 2 is judged to have been eliminated.

[0106] Through this step, reasonable judgment conditions are provided for whether the dirt and blockage of the condenser 2 have been eliminated, thereby realizing feedback control and enabling the condenser 2 to complete self-cleaning more fully.

[0107] When frost forms on the surface of the condenser 2, the frost can fill the gaps between the fins of the condenser 2 and rub against pollutants such as dust and oil, thereby reducing the adhesion of the pollutants; when the frost on the surface of the condenser 2 melts, it can carry the pollutants away from the condenser 2, thereby achieving self-cleaning of the condenser 2.

[0108] The thermal management system and self-cleaning method with condenser self-cleaning function of the present embodiment can make the surface of condenser 2 frosted when the refrigerant circulation path of the refrigeration module is switched to the second refrigerant circulation loop, and the liquid-cooling medium circulation path of the liquid-cooling module is switched to the second liquid-cooling medium circulation loop; the refrigerant circulation path of the refrigeration module is switched to the first refrigerant circulation loop, and the liquid-cooling medium circulation path of the liquid-cooling module is switched to the first liquid-cooling medium circulation loop and the second liquid-cooling medium circulation loop interconnected in parallel, so that the frost on the surface of condenser 2 can be melted; when the surface of condenser 2 is frosted, the frost can fill the fins of condenser 2. The gaps between the sheets are rubbed against pollutants such as dust and oil, thereby reducing the adhesion of the pollutants. When the frost on the surface of the condenser 2 melts, the pollutants can be carried away from the condenser 2, thereby realizing self-cleaning of the condenser 2. The present embodiment can realize self-cleaning of the condenser 2 to prevent and eliminate the fault of dirt and blockage of the condenser 2, save labor costs, and reduce the delay rate when eliminating the fault of dirt and blockage of the condenser 2, thereby ensuring the normal operation of the thermal management system and the energy storage system, and the self-cleaning method can be implemented directly by relying on the components of the thermal management system itself, without adding components to the thermal management system, thereby reducing the cost and complexity of the thermal management system.

[0109] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A thermal management system with a condenser self-cleaning function, characterized in that: Including refrigeration module and liquid cooling module; The refrigeration module includes a compressor, a condenser with a fan for forced convection, a first throttling device, a second throttling device and an evaporative heat exchanger, and the refrigeration module can selectively form any one of a first refrigerant circulation loop and a second refrigerant circulation loop; The refrigerant circulation path of the first refrigerant circulation loop is, in order: the compressor, the condenser, the first throttling device, the refrigerant channel of the evaporative heat exchanger, and the second throttling device; The refrigerant circulation path of the second refrigerant circulation circuit is, in sequence: the compressor, the refrigerant channel of the evaporative heat exchanger, the first throttling device and the condenser; The liquid cooling module comprises a main circulation pump, a liquid cooling heat exchanger and a heat dissipation water tank with a fan for forced convection, and the liquid cooling module constitutes a first liquid cooling medium circulation loop and a second liquid cooling medium circulation loop; The liquid cooling medium circulation path of the first liquid cooling medium circulation loop is, in sequence: the main circulation pump, the liquid cooling medium channel of the evaporative heat exchanger, and the liquid cooling heat exchanger; The liquid cooling medium circulation path of the second liquid cooling medium circulation loop is, in sequence: the main circulation pump, the liquid cooling medium channel of the evaporative heat exchanger and the heat dissipation water tank; Furthermore, the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop can be selectively connected to each other in parallel; When the refrigerant circulation path of the refrigeration module is switched to the second refrigerant circulation loop, and the liquid cooling medium circulation path of the liquid cooling module is switched to the second liquid cooling medium circulation loop, the surface of the condenser can be frosted; Switching the refrigerant circulation path of the refrigeration module to a first refrigerant circulation loop, and switching the liquid cooling medium circulation path of the liquid cooling module to a first liquid cooling medium circulation loop and a second liquid cooling medium circulation loop interconnected in parallel can melt the frost on the surface of the condenser.

2. The thermal management system with condenser self-cleaning function according to claim 1, characterized in that: The refrigeration module also includes a first refrigerant stop valve, a second refrigerant stop valve and a third refrigerant stop valve; The first refrigerant stop valve is connected between the output end of the compressor and the condenser, the second refrigerant stop valve is connected between the output end of the compressor and the refrigerant channel of the evaporative heat exchanger, and the third refrigerant stop valve is connected between the input end of the compressor and the condenser; When the refrigeration module forms the first refrigerant circulation loop, the first refrigerant stop valve is opened, the second refrigerant stop valve and the third refrigerant stop valve are closed, and the refrigerant circulation path of the first refrigerant circulation loop is, in sequence: the compressor, the first refrigerant stop valve, the condenser, the first throttling device, the refrigerant channel of the evaporative heat exchanger, and the second throttling device; When the refrigeration module constitutes the second refrigerant circulation loop, the first refrigerant stop valve is closed, and the second refrigerant stop valve and the third refrigerant stop valve are opened, and the refrigerant circulation path of the second refrigerant circulation loop is: the compressor, the second refrigerant stop valve, the refrigerant channel of the evaporative heat exchanger, the first throttling device, the condenser and the third refrigerant stop valve.

3. The thermal management system with condenser self-cleaning function according to claim 1 or 2, characterized in that: The liquid cooling module also includes a liquid cooling medium stop valve; The liquid-cooling medium shut-off valve is connected to a connection node between the first liquid-cooling medium circulation loop and the second liquid-cooling medium circulation loop, and is used to open or shut off the connection node between the first liquid-cooling medium circulation loop and the second liquid-cooling medium circulation loop.

4. The thermal management system with condenser self-cleaning function according to claim 3, characterized in that: The liquid cooling module also includes a liquid cooling medium proportional valve; The liquid-cooling medium proportional valve is connected to any node of the second liquid-cooling medium circulation loop and is used to adjust the liquid-cooling medium flow rate of the second liquid-cooling medium circulation loop.

5. The thermal management system with condenser self-cleaning function according to claim 3, characterized in that: The liquid cooling module also includes a heater; The heater is connected before the input end of the liquid-cooling heat exchanger and is used for heating the liquid-cooling medium.

6. The thermal management system with condenser self-cleaning function according to claim 1 or 2, characterized in that: The liquid cooling module also includes a liquid outlet temperature sensor T1 and a liquid inlet temperature sensor T2; The outlet liquid temperature sensor T1 is connected to the output end of the heat dissipation water tank, and is used to detect the outlet liquid temperature of the heat dissipation water tank; The inlet liquid temperature sensor T2 is connected to the input end of the radiator water tank and is used to detect the inlet liquid temperature of the radiator water tank.

7. The thermal management system with condenser self-cleaning function according to claim 1 or 2, characterized in that: The refrigeration module also includes a condenser inlet pressure sensor P1, a compressor inlet pressure sensor P2 and a compressor inlet temperature sensor T3; The condenser inlet pressure sensor P1 is connected to the input end of the condenser and is used to detect the refrigerant pressure at the input end of the condenser; The compressor inlet pressure sensor P2 is connected to the input end of the compressor and is used to detect the refrigerant input pressure of the compressor; The compressor inlet temperature sensor T3 is connected to the input end of the compressor and is used to detect the refrigerant input temperature of the compressor.

8. A condenser self-cleaning method for a thermal management system, applied to the thermal management system with a condenser self-cleaning function as claimed in any one of claims 1 to 7, characterized in that: The method includes: S1. After the thermal management system is put into operation, a preset time is counted. When the preset time is reached, or when a condenser fouling failure occurs in the thermal management system, step S2 is entered; S2, detecting the ambient temperature and the ambient humidity. If both the ambient temperature and the ambient humidity meet the preset frost determination threshold, proceeding to step S3. If either the ambient temperature or the ambient humidity does not meet the preset frost determination threshold, then waiting for a sampling time period and proceeding to step S2 again. S3, putting both the refrigeration module and the liquid cooling module into shutdown state; S4, switching the refrigerant circulation path of the refrigeration module to the second refrigerant circulation loop, switching the liquid cooling medium circulation path of the liquid cooling module to the second liquid cooling medium circulation loop, and adjusting the liquid cooling medium flow rate of the second liquid cooling medium circulation loop to the maximum, starting the compressor of the refrigeration module, starting the main circulation pump of the liquid cooling module, and starting the fan to perform forced convection for the condenser of the refrigeration module and / or the evaporative heat exchanger of the liquid cooling module; S5, gradually increasing the speed of the compressor until it reaches full speed, so that frost forms on the surface of the condenser; S6, putting the refrigeration module and the liquid cooling module into a shutdown state again; S7, switching the refrigerant circulation path of the refrigeration module to the first refrigerant circulation loop, switching the liquid cooling medium circulation path of the liquid cooling module to the first liquid cooling medium circulation loop and the second liquid cooling medium circulation loop interconnected in parallel, and adjusting the liquid cooling medium flow rate of the second liquid cooling medium circulation loop to the maximum, starting the compressor of the refrigeration module, starting the main circulation pump of the liquid cooling module, and starting the fan to perform forced convection for the condenser of the refrigeration module and / or the evaporative heat exchanger of the liquid cooling module; S8, gradually increasing the speed of the compressor until it reaches full speed, and setting the fan and the main circulation pump of the liquid cooling module to full speed to melt the frost on the surface of the condenser; S9, putting the refrigeration module and the liquid cooling module into a shutdown state again; S10, restore the normal operation status of the refrigeration module and the liquid cooling module, and determine whether the dirt blockage of the condenser has been eliminated. If the dirt blockage of the condenser has been eliminated, maintain the normal operation status of the refrigeration module and the liquid cooling module, and re-enter step S1; if the dirt blockage of the condenser has not been eliminated, re-enter step S2.

9. The condenser self-cleaning method of the thermal management system according to claim 8, characterized in that: The liquid cooling module further includes a liquid outlet temperature sensor T1 and a liquid inlet temperature sensor T2; the liquid outlet temperature sensor T1 is connected to the output end of the heat dissipation water tank, and is used to detect the liquid outlet temperature of the heat dissipation water tank; the liquid inlet temperature sensor T2 is connected to the input end of the heat dissipation water tank, and is used to detect the liquid inlet temperature of the heat dissipation water tank; The refrigeration module further includes a condenser inlet pressure sensor P1, a compressor inlet pressure sensor P2 and a compressor inlet temperature sensor T3; the condenser inlet pressure sensor P1 is connected to the input end of the condenser and is used to detect the refrigerant pressure at the input end of the condenser; the compressor inlet pressure sensor P2 is connected to the input end of the compressor and is used to detect the refrigerant input pressure of the compressor; The compressor inlet temperature sensor T3 is connected to the input end of the compressor and is used to detect the refrigerant input temperature of the compressor; After step S5, the method further includes: When the following conditions are met at the same time, the condenser is judged to have been sufficiently frosted on the surface, and the process proceeds to step S6: a. The pressure value fed back by the condenser inlet pressure sensor P1 is lower than a preset first threshold; b. The temperature difference between the inlet temperature fed back by the inlet temperature sensor T2 and the outlet temperature of the outlet temperature sensor T1 is lower than a preset second threshold; c. The opening degree of the first throttling device is higher than a preset third threshold value.

10. The condenser self-cleaning method of the thermal management system according to claim 9, characterized in that: In step S10, it is determined whether the dirt blockage of the condenser has been eliminated, and the specific method is as follows: When the following conditions are met at the same time, the condenser is considered to have been cleared of dirt and blockage: a. The pressure value fed back by the condenser inlet pressure sensor P1 is compared with the historical operation data / initial preset data, and the difference is within a preset fourth threshold; b. The pressure value fed back by the compressor inlet pressure sensor P2 is compared with the historical operation data / initial preset data, and the difference is within the preset fifth threshold; c. The temperature value fed back by the compressor inlet temperature sensor T3 is compared with the historical operation data / initial preset data, and the difference is within a preset sixth threshold.

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