Thermal management system and vehicle

Abstract

The invention relates to a thermal management system and a vehicle, and relates to the technical field of vehicles. The thermal management system includes a compressor and first and second loops connected to an outlet of the compressor. The first loop comprises a first control valve and an external condenser, and the first control valve is connected with the compressor and the external condenser. The second loop comprises a second control valve and a built-in condenser, and the second control valve is connected with the compressor and the built-in condenser. The heat management system is configured to open the first control valve and close the second control valve under the condition that the current temperature is smaller than or equal to the first temperature threshold value and the heating working condition is started. And closing the first control valve and opening the second control valve under the condition that the compressor runs for a first duration threshold value and / or the exhaust pressure of the compressor is greater than or equal to the first pressure threshold value. The refrigerant adjusting device is used for adjusting refrigerants in a working loop.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a thermal management system and a vehicle. Background Art

[0002] With the development of motor and power battery technology of new energy electric vehicles, users are experiencing increasing mileage while also placing higher requirements on the thermal management system of the vehicle.

[0003] The relevant technical scheme discloses a thermal management system and a car, which can realize passenger compartment heating, dehumidification, cooling, and battery cooling and heating. When cooling, the refrigerant enters the outdoor condenser to dissipate heat, passes through the second throttling device to enter the indoor evaporator to cool the passenger compartment, or passes through the third throttling device to enter the battery cooler to cool the battery water circuit; when heating, the refrigerant directly enters the indoor condenser to heat the passenger compartment, and passes through the first throttling device to enter the outdoor heat exchanger to absorb heat, or passes through the third throttling device to enter the battery cooler to absorb the residual heat of the electric drive; the passenger compartment and battery heating can also be heated by the indoor heat exchanger and heater. In the current thermal management system, there is a problem of refrigerant accumulation, which leads to abnormal refrigerant quantity in the working circuit.

[0004] In order to adjust the amount of refrigerant in the refrigerant circuit, a refrigerant scheduling circuit including an electronic expansion valve (EXV) and pipelines is usually added, which increases the cost of the thermal management system. Summary of the invention

[0005] One of the purposes of the present application is to provide a thermal management system and a vehicle for adjusting the amount of refrigerant in a working circuit.

[0006] In order to achieve the above purpose, the technical solution adopted in this application is as follows:

[0007] According to the first aspect provided by the present application, a thermal management system is provided, and the thermal management system includes: a compressor and a first circuit and a second circuit connected to the compressor outlet. The first circuit includes a first control valve and an external condenser, and the first control valve is connected to the compressor and the external condenser respectively. The second circuit includes a second control valve and a built-in condenser, and the second control valve is connected to the compressor and the built-in condenser respectively. The thermal management system is configured to: when the current temperature is less than or equal to the first temperature threshold and the heating condition is started, the first control valve is opened and the second control valve is closed. When the compressor runs for a first time threshold and / or the exhaust pressure of the compressor is greater than or equal to the first pressure threshold, the first control valve is closed and the second control valve is opened.

[0008] According to the above technical means, in a low temperature environment, start the heat pump, close the second control valve and open the first control valve. Furthermore, when the heat pump continues for a first time threshold and / or the compressor outlet pressure reaches a first pressure threshold, close the first control valve and open the second control valve. In this way, the pressure of the external condenser is ensured to gradually increase, the gas phase refrigerant replaces the liquid phase refrigerant, the liquid refrigerant accumulated in the external condenser is reduced, and sufficient refrigerant is ensured in the working circuit. In this way, the refrigerant is regulated by controlling the switching of the second control valve and the first control valve, without adding hardware, thereby avoiding an increase in the cost of the thermal management system.

[0009] In one possible manner, the thermal management system further includes a cooling fan and an active air intake grille. The thermal management system is further configured to: turn off the cooling fan and / or turn off the active air intake grille before the compressor runs for a first time threshold and / or the exhaust pressure of the compressor is greater than or equal to a first pressure threshold.

[0010] According to the above technical means, when the compressor speed is controlled to run at the first speed, the second control valve is closed and the first control valve is opened, the cooling fan is turned off and the active air intake grille is closed, further ensuring that the pressure of the external condenser gradually increases, realizing the replacement of the liquid refrigerant by the gas-phase refrigerant in the first circuit, reducing the refrigerant accumulated in the external condenser, and ensuring that there is sufficient refrigerant in the second circuit.

[0011] In one possible manner, the thermal management system is further configured to: when the current temperature is greater than or equal to the second temperature threshold and the refrigeration condition is started, open the first control valve and close the second control valve. When the exhaust pressure of the compressor is greater than or equal to the second pressure threshold and the duration is greater than or equal to the second duration threshold, open the second control valve, and when the second control valve is opened for the first duration, close the second control valve.

[0012] According to the above technical means, when the cooling condition is started in a high temperature environment (such as cooling the passenger compartment or battery), the first control valve is opened and the second control valve is closed. When it is detected that the system pressure is high, the second control valve is opened to control the compressor to run at the second speed, and when the double-open operation lasts for the first time, the second control valve is closed. In this way, the high-pressure pressure relief of the thermal management system is achieved, the compressor is prevented from shutting down for protection due to high pressure, and the impact on the comfort of the passenger compartment is reduced.

[0013] In one possible manner, the thermal management system is further configured to: open the first control valve and the second control valve when the refrigeration condition is started, and close the second control valve when the compressor runs for a third time threshold and / or the exhaust pressure of the compressor is greater than or equal to a third pressure threshold.

[0014] According to the above technical means, when the refrigeration mode is started, the first control valve and the second control valve are opened, and when the compressor runs for a third time threshold and / or the exhaust pressure of the compressor is greater than or equal to the third pressure threshold, the second control valve is closed. In this way, the second circuit is prevented from accumulating a large amount of liquid refrigerant or accumulating a certain pressure of gaseous refrigerant, and the first circuit is guaranteed to have a suitable amount of refrigerant when it is running.

[0015] In a possible manner, the thermal management system is further configured to: in a cooling condition, when the suction pressure of the thermal management system is less than or equal to the fourth pressure threshold and the speed of the compressor is less than or equal to the first speed threshold, open the second control valve. When the duration of the second control valve being open is greater than or equal to the first preset duration, close the second control valve.

[0016] In one possible embodiment, the thermal management system also includes a throttling device, and the thermal management system is further configured to: under refrigeration conditions, when the suction superheat of the compressor is less than or equal to a first superheat threshold and the opening of the throttling device is less than or equal to the first opening threshold, open the second control valve; and when the opening time of the second control valve is greater than or equal to a fourth time threshold, close the second control valve.

[0017] In a possible manner, the thermal management system is further configured to: in a heating condition, when the exhaust pressure of the thermal management system is greater than or equal to the fifth pressure threshold and the compressor speed is less than or equal to the second speed threshold, control the compressor to operate at a target speed and open the first control valve. When the first control valve opening time is greater than or equal to the second preset time, close the first control valve.

[0018] In one possible embodiment, the thermal management system also includes a water-cooled heat exchanger, and the thermal management system is further configured to: under heating conditions, when the intake pressure of the thermal management system is less than or equal to a sixth pressure threshold, the speed of the compressor is less than or equal to a third speed threshold, and the inlet water temperature of the water-cooled heat exchanger is greater than or equal to a third temperature threshold, open the first control valve; and when the first control valve opening time is greater than or equal to a fifth time threshold, close the first control valve.

[0019] In one possible embodiment, the thermal management system also includes a throttling device, and the thermal management system is further configured to: under heating conditions, when the suction superheat of the compressor is less than or equal to a second superheat threshold and the opening of the throttling device is less than or equal to the second opening threshold, open the first control valve; and when the opening time of the first control valve is greater than or equal to a sixth time threshold, close the first control valve.

[0020] In one possible manner, the first circuit further includes a third control valve, a high-pressure liquid storage tank, a first throttling device, and a first water-cooled heat exchanger. The inlet of the third control valve is connected to the outlet of the external condenser, and the outlet of the third control valve is connected to the inlet of the high-pressure liquid storage tank. The outlet of the high-pressure liquid storage tank is connected to the inlet of the first throttling device, and the outlet of the first throttling device is connected to the inlet of the first water-cooled heat exchanger. The outlet of the water-cooled heat exchanger is connected to the inlet of the compressor.

[0021] In one possible manner, the second circuit further includes a second water-cooled heat exchanger, a fourth control valve, a second throttling device, and a heat exchanger. The inlet of the second water-cooled heat exchanger is connected to the outlet of the built-in condenser, the outlet of the second water-cooled heat exchanger is connected to the inlet of the fourth control valve, and the outlet of the fourth control valve is connected to the inlet of the high-pressure liquid storage tank. The outlet of the high-pressure liquid storage tank is connected to the inlet of the second throttling device, the outlet of the second throttling device is connected to the inlet of the heat exchanger, and the outlet of the heat exchanger is connected to the inlet of the compressor.

[0022] According to a second aspect provided by the present application, a vehicle is provided, the vehicle comprising the thermal management system of the first aspect.

[0023] Therefore, the above technical features of the present application have the following beneficial effects:

[0024] (1) In a low temperature environment, start the heat pump, close the second control valve and open the first control valve. Furthermore, when the heat pump continues for a first time threshold and / or the compressor outlet pressure reaches a first pressure threshold, close the first control valve and open the second control valve. In this way, the pressure of the external condenser is gradually increased, the gas phase refrigerant replaces the liquid phase refrigerant, the liquid refrigerant accumulated in the external condenser is reduced, and sufficient refrigerant is ensured in the working circuit. In this way, the refrigerant is regulated by controlling the switching of the second control valve and the first control valve without adding hardware, thereby avoiding an increase in the cost of the thermal management system.

[0025] (2) When the compressor speed is controlled to run at the first speed, the second control valve is closed, and the first control valve is opened, the cooling fan is turned off, and the active air intake grille is closed, so as to further ensure that the pressure of the external condenser gradually increases, so that the gas phase refrigerant in the first circuit replaces the liquid phase refrigerant, and the refrigerant accumulated in the external condenser is reduced, so as to ensure that there is sufficient refrigerant in the second circuit.

[0026] (3) When starting the cooling condition in a high temperature environment (such as cooling the passenger compartment or battery), the first control valve is opened and the second control valve is closed. When it is detected that the system pressure is high, the second control valve is opened to control the compressor to run at the second speed, and when the two control valves are opened and run continuously for the first time, the second control valve is closed. In this way, the high-pressure pressure relief of the thermal management system is achieved, the compressor is prevented from shutting down for protection due to high pressure, and the impact on the comfort of the passenger compartment is reduced.

[0027] (4) When the refrigeration mode is started, the first control valve and the second control valve are opened, and when the compressor runs for a third time threshold and / or the exhaust pressure of the compressor is greater than or equal to the third pressure threshold, the second control valve is closed. In this way, a large amount of liquid refrigerant or a certain pressure of gaseous refrigerant is prevented from accumulating in the second circuit, and an appropriate amount of refrigerant is ensured when the first circuit is running. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 One of the structural schematic diagrams of a thermal management system provided in this application;

[0029] Figure 2 One of the flow diagrams of a refrigerant regulation method provided in this application;

[0030] Figure 3 The second flow chart of a refrigerant regulation method provided in this application;

[0031] Figure 4 The third flow chart of a refrigerant regulation method provided in this application;

[0032] Figure 5 A fourth flow chart of a refrigerant regulation method provided in the present application;

[0033] Figure 6 A fifth flow chart of a refrigerant regulation method provided in the present application;

[0034] Figure 7 The sixth flow chart of a refrigerant regulation method provided in this application;

[0035] Figure 8 The seventh flow chart of a refrigerant regulation method provided in the present application;

[0036] Fig. 9 The eighth flow chart of a refrigerant regulation method provided in the present application;

[0037] Fig.10 The second structural diagram of a thermal management system provided by this application;

[0038] Fig.11 The third structural diagram of a thermal management system provided by this application;

[0039] Fig.12 A schematic diagram of the water connection flow direction of a thermal management system provided in this application under cooling conditions;

[0040] Fig.13 A schematic diagram of the water connection flow direction of a thermal management system provided in the present application under heating conditions.

[0041] Description of Reference Numerals

[0042] 1. Compressor; 2. First control valve; 3. External condenser; 4. Third control valve; 5. High-pressure liquid storage tank; 6. First throttling device; 7. First water-cooled heat exchanger; 8. Second throttling device; 9. In-vehicle heat exchanger; 10. Second control valve; 11. Built-in condenser; 12. Second water-cooled heat exchanger; 13. Fourth control valve; 14. Gas-liquid separator; 15. Third water-cooled heat exchanger; 16. Electric drive assembly; 17. First water pump; 18. Second water pump; 19. Battery assembly; 20. Water multi-way valve. DETAILED DESCRIPTION

[0043] The following will describe the implementation methods of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, not for limiting the scope of protection of the present application.

[0044] It should be noted that the terms "first", "second", etc. 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 herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0045] With the development of motor and power battery technology of new energy electric vehicles, users are experiencing increasing mileage while also placing higher requirements on the thermal management system of the vehicle.

[0046] The relevant technical scheme discloses a thermal management system and a vehicle, which can realize heating, dehumidification, cooling of the passenger compartment, and cooling and heating of the battery. During cooling, the refrigerant enters the outdoor condenser to dissipate heat, and enters the indoor evaporator through the second throttling device to cool the passenger compartment, or enters the battery cooler through the third throttling device to cool the battery water circuit; during heating, the refrigerant directly enters the indoor condenser to heat the passenger compartment, and enters the outdoor heat exchanger through the first throttling device to absorb heat, or enters the battery cooler through the third throttling device to absorb waste heat from the electric drive; the passenger compartment and battery heating can also be heated by the indoor heat exchanger and heater.

[0047] However, the current thermal management system has the following problems: in scenarios where there is a large temperature difference between the inside and outside of the vehicle, such as in winter, the refrigerant in the external condenser will gradually condense after shutdown. Long-term shutdown will cause a large amount of refrigerant to accumulate on the outside, resulting in insufficient refrigerant in the working circuit and poor heating effect.

[0048] In order to solve the above technical problems, Figure 1 As shown, the present application provides a thermal management system 100, which includes: a compressor 1 and a first circuit and a second circuit connected to the outlet of the compressor 1. The first circuit includes a first control valve 2 and an external condenser 3, and the first control valve 2 is connected to the compressor 1 and the external condenser 3 respectively. The second circuit includes a second control valve 10 and a built-in condenser 11, and the second control valve 10 is connected to the compressor 1 and the built-in condenser 11 respectively. The thermal management system 100 is configured to: when the current temperature is less than or equal to the first temperature threshold and the heating condition is started, open the first control valve 2 and close the second control valve 10. When the compressor 1 runs for a first time threshold and / or the exhaust pressure of the compressor 1 is greater than or equal to the first pressure threshold, close the first control valve 2 and open the second control valve 10.

[0049] For example, Figure 2 As shown, a schematic flow chart of a refrigerant regulation method of a thermal management system 100 is shown, including: S10-S17.

[0050] S10, start heating mode.

[0051] S11 , open the first control valve 2 and close the second control valve 10 .

[0052] In some embodiments, when the current temperature is less than or equal to the first temperature threshold, the first control valve 2 is opened and the second control valve 10 is closed.

[0053] In other embodiments, when the current temperature is less than or equal to the first temperature threshold and the heating condition is started, the first control valve 2 is opened, the second control valve 10 is closed, the cooling fan is turned off, and the active air intake grille is closed.

[0054] S12, controlling the compressor 1 to operate at a first speed.

[0055] It should be noted that the first rotational speed is pre-set by the operation and maintenance personnel, and the embodiment of the present application does not limit the specific value of the first rotational speed.

[0056] S13: Determine whether the operation time of the compressor 1 is greater than or equal to a first time threshold.

[0057] If not, execute S14. If yes, execute S15.

[0058] S14: Determine whether the exhaust pressure of the compressor 1 is greater than or equal to a first pressure threshold.

[0059] If yes, then S15 is executed. If no, then it is further determined whether the running time of the compressor 1 is greater than or equal to the first time threshold.

[0060] The exhaust pressure in the embodiment of the present application may be the outlet pressure of the compressor 1 .

[0061] S15, open the second control valve 10.

[0062] S16: Determine whether the duration of the opening of the second control valve 10 is greater than or equal to a fifth preset duration.

[0063] If yes, then S17 is executed. If no, then it is further determined whether the opening time of the second control valve 10 is greater than or equal to the fifth preset time.

[0064] S17, close the first control valve 2.

[0065] It is understandable that in a low temperature environment, the heat pump is started, the second control valve is closed and the first control valve is opened, and when the first time threshold is maintained and / or the outlet pressure of the compressor 1 reaches the first pressure threshold, the pressure of the external condenser is ensured to gradually increase, so that the gas phase refrigerant replaces the liquid phase refrigerant, the refrigerant accumulated in the external condenser is reduced, and sufficient refrigerant is ensured in the working circuit. In this way, the refrigerant is regulated by controlling the opening and closing of the second control valve and the first control valve, without adding hardware, thus avoiding the increase in the cost of the thermal management system.

[0066] In a possible design, the thermal management system 100 further includes a cooling fan and an active air intake grille. The thermal management system 100 is further configured to: turn off the cooling fan and / or turn off the active air intake grille before the compressor 1 runs for a first time threshold and / or the exhaust pressure of the compressor 1 is greater than or equal to a first pressure threshold.

[0067] It can be understood that in a low temperature environment, the heat pump is started, the second control valve 10 is closed, and the first control valve 2 is opened. Furthermore, when the heat pump continues for a first time threshold and / or the outlet pressure of the compressor 1 reaches a first pressure threshold, the first control valve is closed and the second control valve is opened. In this way, the pressure of the external condenser 3 is ensured to gradually increase, the gas phase refrigerant replaces the liquid phase refrigerant, the liquid refrigerant accumulated in the external condenser is reduced, and sufficient refrigerant is ensured in the working circuit. In this way, the refrigerant is regulated by controlling the switching of the second control valve 10 and the first control valve 2 without adding hardware, thereby avoiding an increase in the cost of the thermal management system 100.

[0068] In a possible design, the thermal management system 100 is further configured to: when the current temperature is greater than or equal to the second temperature threshold and the refrigeration condition is started, open the first control valve 2 and close the second control valve 10. When the exhaust pressure of the compressor 1 is greater than or equal to the second pressure threshold and the duration is greater than or equal to the second duration threshold, open the second control valve 10, and when the second control valve 10 is opened for the first duration, close the second control valve 10.

[0069] For example, Figure 3 As shown, a schematic flow chart of a refrigerant regulation method of a thermal management system 100 is shown, including: S20-S26.

[0070] S20, start the refrigeration mode.

[0071] S21 , open the first control valve 2 and close the second control valve 10 .

[0072] In some embodiments, when the current temperature is greater than or equal to the second temperature threshold, the first control valve 2 is opened and the second control valve 10 is closed.

[0073] S22: Determine whether the exhaust pressure of the compressor 1 is greater than or equal to a second pressure threshold.

[0074] If yes, then S23 is executed. If no, then it is further determined whether the exhaust pressure of the compressor 1 is greater than or equal to the second pressure threshold.

[0075] S23: Determine whether the duration is greater than or equal to a second duration threshold.

[0076] In some embodiments, when the exhaust pressure of compressor 1 is greater than or equal to the second pressure threshold, it is determined whether the duration for which the exhaust pressure of compressor 1 is greater than or equal to the second pressure threshold is greater than or equal to the second duration threshold.

[0077] If yes, then S24 is executed. If no, then it is continued to determine whether the duration is greater than or equal to the second duration threshold.

[0078] S24, open the second control valve 10.

[0079] S25. Determine whether the opening time of the second control valve 10 is greater than or equal to a sixth preset time.

[0080] In some embodiments, when the second control valve 10 is opened, the compressor 1 is controlled to operate at the second speed. Further, it is determined whether the opening time of the second control valve 10 is greater than or equal to a sixth preset time.

[0081] If yes, then S26 is executed. If no, then it is further determined whether the opening time of the second control valve 10 is greater than or equal to the sixth preset time.

[0082] S26 , close the second control valve 10 .

[0083] It can be understood that when the cooling condition is started in a high temperature environment (such as cooling the passenger compartment or battery), the first control valve 2 is opened and the second control valve 10 is closed. When the system pressure ≥ P3 is detected, the second control valve 10 is opened to control the compressor to run at the second speed, and when the double opening continues to run for the sixth preset time, the second control valve 10 is closed. In this way, the high-pressure pressure relief of the thermal management system 100 is achieved, the compressor 1 is prevented from shutting down for protection due to high pressure, and the impact on the comfort of the passenger compartment is reduced.

[0084] In a possible design, the thermal management system 100 is further configured to: when the refrigeration condition is started, open the first control valve 2 and the second control valve 10. When the compressor 1 runs for a third time threshold and / or the exhaust pressure of the compressor 1 is greater than or equal to the third pressure threshold, close the second control valve 10.

[0085] For example, Figure 4 As shown, a schematic flow chart of a refrigerant regulation method of a thermal management system 100 is shown, including: S30-S35.

[0086] S30, start the refrigeration mode.

[0087] S31 , opening the second control valve 10 and the first control valve 2 .

[0088] In some embodiments, when the current temperature is greater than or equal to the second temperature threshold, the first control valve 2 is opened and the second control valve 10 is opened.

[0089] S32, controlling the compressor 1 to operate at a third speed.

[0090] S33, determining whether the operating time of the compressor 1 at the third speed is greater than or equal to a third time threshold.

[0091] If not, execute S34. If yes, execute S35.

[0092] S34. Determine whether the exhaust pressure of compressor 1 is greater than or equal to a third pressure threshold.

[0093] If yes, execute S35. If no, continue to check whether the compressor 1 runs at the third speed for a time greater than or equal to the third time threshold.

[0094] S35 , close the second control valve 10 .

[0095] In another case, after S31, it is determined whether the exhaust pressure of the compressor 1 is greater than or equal to the third pressure threshold, and if so, the second control valve 10 is closed.

[0096] In another case, when the compressor 1 runs at the third speed for a time greater than or equal to the third time threshold and the exhaust pressure of the compressor 1 is greater than or equal to the third pressure threshold, the second control valve 10 is closed.

[0097] It can be understood that when the refrigeration mode is started, the first control valve 2 and the second control valve 10 are opened, the active air intake grille is opened, and the condensing fan is turned on. When the compressor 1 runs for the third time threshold and / or the exhaust pressure of the compressor 1 is greater than or equal to the third pressure threshold, the second control valve 10 is closed. In this way, a large amount of liquid refrigerant or a certain pressure of gaseous refrigerant is prevented from accumulating in the second circuit, and a suitable amount of refrigerant is ensured when the first circuit is running.

[0098] In a possible design, the thermal management system 100 is further configured to: in the cooling condition, when the suction pressure of the thermal management system 100 is less than or equal to the fourth pressure threshold and the speed of the compressor 1 is less than or equal to the first speed threshold, open the second control valve 10. When the opening time of the second control valve 10 is greater than or equal to the first preset time, close the second control valve 10.

[0099] For example, Figure 5 As shown, a schematic flow chart of a refrigerant regulation method of a thermal management system 100 is shown, including: S40-S45.

[0100] S40: Under refrigeration conditions, the first control valve 2 is opened and the second control valve 10 is closed.

[0101] In some embodiments, in response to the user clicking on the cooling operation, the first control valve 2 is opened and the second control valve 10 is closed to enter the cooling state.

[0102] S41 . Determine whether the intake pressure of the thermal management system 100 is less than or equal to a fourth pressure threshold.

[0103] If yes, then S42 is executed. If no, then it is further determined whether the intake pressure of the thermal management system 100 is less than or equal to the fourth pressure threshold.

[0104] S42: Determine whether the rotation speed of the compressor 1 is less than or equal to a first rotation speed threshold.

[0105] If yes, then S43 is executed. If no, then it is further determined whether the rotation speed of the compressor 1 is less than or equal to the first rotation speed threshold.

[0106] S43: Open the second control valve 10.

[0107] In some embodiments, when the rotation speed of the compressor 1 is less than or equal to a first rotation speed threshold, the second control valve 10 is opened.

[0108] In other embodiments, when the speed of the compressor 1 is less than or equal to the first speed threshold, timing is started to obtain the first speed duration, and when the first speed duration is greater than or equal to the seventh duration threshold, the second control valve 10 is opened.

[0109] S44, determining whether the opening time of the second control valve 10 is greater than or equal to a first preset time length.

[0110] In some embodiments, when the second control valve 10 is opened, the time for which the second control valve 10 is opened is counted, and it is determined whether the time for which the second control valve 10 is opened is greater than or equal to a first preset time. If so, S45 is executed.

[0111] S45, close the second control valve 10.

[0112] It can be understood that under the refrigeration condition, the second control valve 10 is closed and the first control valve 2 is opened. During the normal operation of the thermal management system 100, when the suction pressure is detected to be less than or equal to the fourth pressure threshold, and the actual speed of the compressor 1 is lower than the first speed threshold, the second control valve 10 is opened. Subsequently, when the duration of the dual opening of the first control valve 2 and the second control valve 10 is greater than or equal to the sixth time threshold, the second control valve 10 is closed, so that the thermal management system 100 operates normally.

[0113] In one possible design, the thermal management system 100 also includes a throttling device, and the thermal management system 100 is also configured to: under refrigeration conditions, when the suction superheat of the compressor 1 is less than or equal to the first superheat threshold and the opening of the throttling device is less than or equal to the first opening threshold, open the second control valve 10; and when the opening time of the second control valve 10 is greater than or equal to a fourth time threshold, close the second control valve 10.

[0114] For example, Figure 6 As shown, a schematic flow chart of a refrigerant regulation method of a thermal management system 100 is shown, including: S50-S55.

[0115] S50: Under refrigeration conditions, the first control valve 2 is opened and the second control valve 10 is closed.

[0116] In some embodiments, in response to the user clicking on the cooling operation, the first control valve 2 is opened and the second control valve 10 is closed to enter the cooling state.

[0117] S51. Determine whether the suction superheat of compressor 1 is less than or equal to a first superheat threshold.

[0118] If yes, then S52 is executed. If no, then it is continued to determine whether the suction superheat of the compressor 1 is less than or equal to the first superheat threshold.

[0119] S52: Determine whether the opening of the throttling device is less than or equal to a first opening threshold.

[0120] If yes, then S53 is executed. If no, then it is further determined whether the opening of the throttling device is less than or equal to the first opening threshold. The throttling device in this step can be the first throttling device 6 or the second throttling device 8, which is not limited in the embodiment of the present application.

[0121] S53: Open the second control valve 10.

[0122] In some embodiments, when the opening degree of the throttling device is less than or equal to the first opening degree threshold, the second control valve 10 is opened.

[0123] In other embodiments, when the opening of the throttling device is less than or equal to the first opening threshold, timing is started to obtain the second speed duration, and when the second speed duration is greater than or equal to the eighth duration threshold, the second control valve 10 is opened.

[0124] S54: Determine whether the opening time of the second control valve 10 is greater than or equal to a fourth time threshold.

[0125] In some embodiments, when the second control valve 10 is opened, the opening time of the second control valve 10 is counted, and it is determined whether the opening time of the second control valve 10 is greater than or equal to a fourth time threshold. If so, S55 is executed.

[0126] S55 , close the second control valve 10 .

[0127] It can be understood that, under refrigeration conditions, the first control valve 2 is opened and the second control valve 10 is closed. When it is detected that the suction superheat of the compressor 1 is lower than the target superheat and the throttling device opening is the minimum opening, the second control valve 10 is opened and after the opening duration is greater than or equal to the fourth time threshold, the second control valve 10 is closed. In this way, the amount of refrigerant in the working circuit is reduced to ensure the suction superheat of the compressor 1.

[0128] In a possible design, the thermal management system 100 is further configured to: in the heating condition, when the exhaust pressure of the compressor 1 is greater than or equal to the fifth pressure threshold and the speed of the compressor 1 is less than or equal to the second speed threshold, control the compressor 1 to operate at the target speed and open the first control valve 2. When the opening time of the first control valve 2 is greater than or equal to the fourth time threshold, close the second control valve 10. And close the second control valve 10.

[0129] In some embodiments, the fifth pressure value is positively correlated with the second rotation speed threshold.

[0130] For example, Figure 7 As shown, a schematic flow chart of a refrigerant regulation method of a thermal management system 100 is shown, including: S60-S65.

[0131] S60: Under heating conditions, the second control valve 10 is opened and the first control valve 2 is closed.

[0132] In some embodiments, in response to the user clicking the heating button, the second control valve 10 is opened and the first control valve 2 is closed to enter the heating state.

[0133] S61 . Determine whether the exhaust pressure of the thermal management system 100 is greater than or equal to a fifth pressure threshold.

[0134] If yes, then S62 is executed. If no, then whether the exhaust pressure of the thermal management system 100 is greater than or equal to the fifth pressure threshold is continued.

[0135] S62: Determine whether the rotation speed of the compressor 1 is less than or equal to a second rotation speed threshold.

[0136] If yes, then S63 is executed. If no, then whether the speed of the compressor 1 is less than or equal to the second speed threshold is continued.

[0137] S63, open the first control valve 2.

[0138] In some embodiments, when the compressor speed is less than or equal to a second speed threshold, the first control valve 2 is opened.

[0139] In other embodiments, when the compressor speed is less than or equal to the second speed threshold, timing is started to obtain a third speed duration, and when the third speed duration is greater than or equal to a ninth duration threshold, the compressor 1 is controlled to operate at a fourth speed and the first control valve 2 is opened.

[0140] S64, determining whether the opening time of the first control valve 2 is greater than or equal to a second preset time length.

[0141] In some embodiments, when the first control valve 2 is opened, the time for which the first control valve 2 is opened is counted, and it is determined whether the time for which the first control valve 2 is opened is greater than or equal to the second preset time. If so, S65 is executed. If not, it is continued to determine whether the time for which the first control valve 2 is opened is greater than or equal to the second preset time.

[0142] S65, close the first control valve 2.

[0143] It can be understood that in the heat pump working condition, when it is operating normally, the first control valve 2 is closed and the second control valve 10 is opened. When the exhaust pressure is detected to be too high and the compressor speed is low at this time, the first control valve 2 is opened for a certain period of time and then closed. In this way, the excess refrigerant in the second circuit is released into the first circuit.

[0144] In one possible design, the thermal management system 100 also includes a first water-cooled heat exchanger 7, and the thermal management system 100 is also configured to: under heating conditions, when the intake pressure of the thermal management system 100 is less than or equal to a sixth pressure threshold, the speed of the compressor 1 is less than or equal to a third speed threshold, and the inlet water temperature of the first water-cooled heat exchanger 7 is greater than or equal to a third temperature threshold, open the first control valve 2, and when the opening time of the first control valve 2 is greater than or equal to a fifth time threshold, close the first control valve 2.

[0145] For example, Figure 8 As shown, a schematic flow chart of a refrigerant regulation method of a thermal management system 100 is shown, including: S70-S76.

[0146] S70: Under heating conditions, the second control valve 10 is opened and the first control valve 2 is closed.

[0147] In some embodiments, in response to the user clicking the heating button, the second control valve 10 is opened and the first control valve 2 is closed to enter the heating state.

[0148] S71 . Determine whether the intake pressure of the thermal management system 100 is less than or equal to a sixth pressure threshold.

[0149] If yes, then S72 is executed. If no, then whether the intake pressure of the thermal management system 100 is less than or equal to the sixth pressure threshold is continued.

[0150] S72. Determine whether the rotation speed of the compressor 1 is less than or equal to a third rotation speed threshold.

[0151] If yes, then S73 is executed. If no, then it is further determined whether the speed of the compressor 1 is less than or equal to the third speed threshold.

[0152] S73. Determine whether the water inlet temperature of the first water-cooled heat exchanger 7 is greater than or equal to a third temperature threshold.

[0153] If yes, then S74 is executed. If no, then it is further determined whether the water inlet temperature of the first water-cooled heat exchanger 7 is greater than or equal to the third temperature threshold.

[0154] S74, open the first control valve 2.

[0155] In some embodiments, when the water inlet temperature of the water-cooled heat exchanger is greater than or equal to a third temperature threshold, the first control valve 2 is opened.

[0156] In other embodiments, when the inlet water temperature of the water-cooled heat exchanger is greater than or equal to the third temperature threshold, timing is started to obtain the fourth speed duration, and when the fourth speed duration is greater than or equal to the third preset duration, the first control valve 2 is opened.

[0157] S75: Determine whether the opening time of the first control valve 2 is greater than or equal to a fifth time threshold.

[0158] In some embodiments, when the first control valve 2 is opened, the time for which the first control valve 2 is opened is counted, and it is determined whether the time for which the first control valve 2 is opened is greater than or equal to the fifth time threshold. If so, S76 is executed. If not, it is continued to determine whether the time for which the first control valve 2 is opened is greater than or equal to the fifth time threshold.

[0159] S76, close the first control valve 2.

[0160] It can be understood that in the heat pump working condition, the second control valve 10 is opened and the first control valve 2 is closed. When the suction pressure of the thermal management system 100 is less than or equal to the sixth pressure threshold, the speed of the compressor 1 is less than or equal to the third speed threshold, and the inlet water temperature of the first water-cooled heat exchanger 7 is greater than or equal to the third temperature threshold, the first control valve 2 is opened, and when the first control valve is opened for a certain period of time, the first control valve 2 is closed. In this way, when the first control valve 2 and the second control valve 10 are both open, the refrigerant part of the first circuit (non-working circuit) is recovered.

[0161] In one possible design, the thermal management system 100 also includes a throttling device, and the thermal management system 100 is also configured to: under heating conditions, when the suction superheat of the compressor 1 is less than or equal to the second superheat threshold and the opening of the throttling device is less than or equal to the second opening threshold, open the first control valve 2, and when the opening time of the first control valve 2 is greater than or equal to the sixth time threshold, close the first control valve 2.

[0162] For example, Fig. 9As shown, a schematic diagram of a refrigerant regulation process of a thermal management system 100 is shown, including: S80-S85.

[0163] S80: Under heating conditions, the second control valve 10 is opened and the first control valve 2 is closed.

[0164] In some embodiments, in response to the user clicking the heating button, the second control valve 10 is opened and the first control valve 2 is closed to enter the heating state.

[0165] S81. Determine whether the suction superheat of the compressor 1 is less than or equal to a second superheat threshold.

[0166] If yes, then S82 is executed. If no, then it is further determined whether the suction superheat of the compressor 1 is less than or equal to the second superheat threshold.

[0167] S82: Determine whether the opening of the throttling device is less than or equal to a second opening threshold.

[0168] If yes, then S83 is executed. If no, then it is further determined whether the opening of the throttling device is less than or equal to the second opening threshold. The throttling device in this step can be the first throttling device 6 or the second throttling device 8, which is not limited in the embodiment of the present application.

[0169] S83, open the first control valve 2.

[0170] In some embodiments, when the opening degree of the throttling device is less than or equal to the second opening degree threshold, the first control valve 2 is opened.

[0171] In other embodiments, when the opening of the throttling device is less than or equal to the second opening threshold, timing is started to obtain the fifth speed duration, and when the fifth speed duration is greater than or equal to the fourth preset duration, the first control valve 2 is opened.

[0172] S84: Determine whether the opening time of the first control valve 2 is greater than or equal to a sixth time threshold.

[0173] In some embodiments, when the first control valve 2 is opened, the opening time of the first control valve 2 is counted, and it is determined whether the opening time of the first control valve 2 is greater than or equal to the sixth time threshold. If so, S85 is executed.

[0174] S85, close the first control valve 2.

[0175] It can be understood that in the heat pump operating condition, the second control valve 10 is opened, the first control valve 2 is closed, and in the low-load operating condition, the compressor suction superheat is detected to be lower than the target superheat, and the throttling device opening is at the minimum opening at this time, which lasts for a certain period of time. The first control valve 2 is opened, and when the time for opening the first control valve 2 is greater than or equal to the sixth time threshold, the first control valve 2 is closed.

[0176] In one possible design, Fig.10 As shown, the first circuit also includes a third control valve 4, a high-pressure liquid storage tank 5, a first throttling device 6 and a first water-cooled heat exchanger 7. The inlet of the third control valve 4 is connected to the outlet of the external condenser, and the outlet of the third control valve 4 is connected to the inlet of the high-pressure liquid storage tank 5. The outlet of the high-pressure liquid storage tank 5 is connected to the inlet of the first throttling device 6, and the outlet of the first throttling device 6 is connected to the inlet of the first water-cooled heat exchanger 7. The outlet of the first water-cooled heat exchanger 7 is connected to the inlet of the compressor 1.

[0177] In one possible design, Fig.10 As shown, the second circuit also includes a second water-cooled heat exchanger 12, a fourth control valve 13, a second throttling device 8 and an in-vehicle heat exchanger 9. The inlet of the second water-cooled heat exchanger 12 is connected to the outlet of the built-in condenser, the outlet of the second water-cooled heat exchanger 12 is connected to the inlet of the fourth control valve 13, and the outlet of the fourth control valve 13 is connected to the inlet of the high-pressure liquid storage tank 5. The outlet of the high-pressure liquid storage tank 5 is connected to the inlet of the second throttling device 8, the outlet of the second throttling device 8 is connected to the inlet of the in-vehicle heat exchanger 9, and the outlet of the in-vehicle heat exchanger 9 is connected to the inlet of the compressor 1.

[0178] In other embodiments, Fig.11 As shown, the first circuit also includes a third control valve 4, a first throttling device 6, a first water-cooled heat exchanger 7 and a gas-liquid separator 14. The inlet of the third control valve 4 is connected to the outlet of the external condenser, the outlet of the third control valve 4 is connected to the inlet of the first throttling device 6, and the outlet of the first throttling device 6 is connected to the inlet of the first water-cooled heat exchanger 7. The outlet of the first water-cooled heat exchanger 7 is connected to the inlet of the gas-liquid separator 14. The outlet of the gas-liquid separator 14 is connected to the inlet of the compressor 1.

[0179] like Fig.11 As shown, the second circuit also includes a second water-cooled heat exchanger 12, a fourth control valve 13, a second throttling device 8 and an in-vehicle heat exchanger 9. The inlet of the second water-cooled heat exchanger 12 is connected to the outlet of the built-in condenser, the outlet of the second water-cooled heat exchanger 12 is connected to the inlet of the fourth control valve 13, the outlet of the fourth control valve 13 is connected to the inlet of the second throttling device 8, the outlet of the second throttling device 8 is connected to the inlet of the in-vehicle heat exchanger 9, and the outlet of the in-vehicle heat exchanger 9 is connected to the inlet of the gas-liquid separator 14. The outlet of the gas-liquid separator 14 is connected to the inlet of the compressor 1.

[0180] In addition, combined Fig.10 The refrigerant circuit of the thermal management system 100 in the embodiment of the present application is connected to the following four circulation circuits.

[0181] Circulation loop 1: compressor 1→first control valve 2→external condenser 3→third control valve 4→high-pressure liquid storage tank 5→first throttling device 6→first water-cooled heat exchanger 7→compressor 1.

[0182] Circulation loop 2: compressor 1 → first control valve 2 → external condenser 3 → third control valve 4 → high-pressure liquid storage tank 5 → second throttling device 8 → in-vehicle heat exchanger 9 → compressor 1.

[0183] Circulation loop 3: compressor 1 → second control valve 10 → built-in condenser 11 → second water-cooled heat exchanger 12 → fourth control valve 13 → high-pressure liquid storage tank 5 → first throttling device 6 → water-cooled heat exchanger 7 → compressor 1.

[0184] Circulation loop 4: compressor 1 → second control valve 10 → built-in condenser 11 → second water-cooled heat exchanger 12 → fourth control valve 13 → high-pressure liquid storage tank 5 → second throttling device 8 → in-vehicle heat exchanger 9 → compressor 1.

[0185] In some embodiments, control valve 2 → external condenser 3 → control valve 4 is circulation branch 1; control valve 10 → internal condenser → water-cooled heat exchanger 12 → control valve 13 is circulation branch 2; throttling device 6 → water-cooled heat exchanger 7 is circulation branch 3; throttling device 8 → in-vehicle heat exchanger 9 is circulation branch 4. Circulation branch 1 is used to dissipate heat to the outside world through the refrigerant circuit, circulation branch 2 is used for passenger compartment heating and battery heating, circulation branch 3 is used for passenger compartment cooling or dehumidification, and circulation branch 4 is used for battery cooling or water circuit waste heat recovery.

[0186] Combination Fig.10, the outlet of the compressor 1 in the thermal management system 100 in the embodiment of the present application is connected to two control valves: the first control valve 2 and the second control valve 10. Through the first control valve 2 and the second control valve 10, the refrigerant is controlled to flow to the external condenser 3 or the internal condenser 11, or to flow at the same time. When the passenger compartment or the battery needs to be cooled, the first control valve 2 is opened, and the refrigerant enters the external condenser 3. After the high-temperature and high-pressure gaseous refrigerant releases heat to the air outside the vehicle, it becomes a high-temperature and high-pressure liquid or gas-liquid mixed refrigerant, and enters the high-pressure liquid storage tank 5 after passing through the third control valve 4. Gas-liquid separation is performed in the high-pressure liquid storage tank 5. The liquid refrigerant passes through the first throttling device 6 to become a low-temperature and low-pressure refrigerant, absorbs heat in the in-vehicle heat exchanger 9, and cools the passenger compartment; or passes through the throttling device 7, and cools the heat transfer medium entering the battery in the water-cooled heat exchanger to achieve battery cooling. When the passenger compartment or the battery needs to be heated, the second control valve 10 is opened, and the high-temperature and high-pressure gaseous refrigerant releases heat to the passenger compartment through the built-in condenser 11, or releases heat to the heat transfer medium entering the battery in the water-cooled heat exchanger 12, so as to heat the passenger compartment, the battery, or both at the same time. After being cooled, the refrigerant enters the gas-liquid separator 5 through the control valve 13, and then can choose to enter the in-vehicle heat exchanger 9 through the throttling component 8 to dehumidify the passenger compartment, or can pass through the water-cooled heat exchanger 7 to absorb the water side heat to maintain the normal operation of the entire heat pump cycle.

[0187] In some embodiments, in combination Fig.10 ,like Fig.12 as well as Fig.13 As shown, the thermal management system 100 in the embodiment of the present application also includes: a third water-cooled heat exchanger 15, an electric drive assembly 16, a first water pump 17, a second water pump 18, a battery assembly 19 and a multi-way valve 20. The multi-way valve 20 includes multiple interfaces: 201, 202, 203, 204, 205, 206, 207, 208 and 209. The multi-way valve 20 is connected to the first water-cooled heat exchanger 7, the second water pump 18, the battery assembly 19, the second water-cooled heat exchanger 12 and the third water-cooled heat exchanger 15 respectively. The second water pump 18 is connected to the battery assembly 19. The electric drive assembly 16 is connected to the first water pump 17. The third water-cooled heat exchanger 15 is connected to the electric drive assembly 16.

[0188] exist Fig.12 , a schematic diagram of the water connection flow direction of the thermal management system 100 under refrigeration conditions is shown. Specifically, the water circuit under refrigeration conditions is as follows: 201 interface of the multi-way valve 20 → second water pump 18 → battery assembly 19 → multi-way valve 202 interface → multi-way valve 208 interface → first water-cooled heat exchanger 7 → multi-way valve 209 interface → multi-way valve 20 201 interface.

[0189] The interface 203 of the multi-way valve 20 → the interface 204 of the multi-way valve → the second water-cooled heat exchanger 12 → the interface 203 of the multi-way valve.

[0190] Interface 205 of the multi-way valve 20 → the third water-cooled heat exchanger 15 → the electric drive component 16 → the first water pump 17 → the interface 207 of the multi-way valve → the interface 205 of the multi-way valve.

[0191] Fig.13 The water circuit in the heating condition can cool the battery and dissipate heat of the electric drive components.

[0192] exist Fig.13 , a schematic diagram of the water circuit connection flow direction of the thermal management system 100 under heating conditions is shown. Specifically, the water circuit under heating conditions is as follows:

[0193] Interface 201 of the multi-way valve 20 → second water pump 18 → battery assembly 19 → interface 202 of the multi-way valve → interface 203 of the multi-way valve → second water-cooled heat exchanger 12 → interface 204 of the multi-way valve → interface 201 of the multi-way valve.

[0194] Interface 206 of the multi-way valve 20 → electric drive assembly 16 → first water pump 17 → interface of multi-way valve 207 → interface of multi-way valve 208 → first water-cooled heat exchanger 7 → interface of multi-way valve 209 → interface of multi-way valve 206 . Fig.13 The water circuit under cooling conditions can achieve heat dissipation for battery heating and electric drive waste heat recovery.

[0195] The third control valve 4 and the fourth control valve 13 in the embodiment of the present application can be one-way valves to prevent high-temperature and high-pressure liquid refrigerant from entering the non-working circuit and reduce the refrigerant filling amount of the system. The first control valve 2 and the second control valve 10 can be normally open stop valves to ensure that the pressure of the thermal management system 100 can be balanced as soon as possible after shutdown, and can also prevent the system from shutting down due to high-pressure shutdown when the stop valve fails.

[0196] like Fig.11 In the thermal management system 100, a gas-liquid separator 14 is used to ensure the inlet superheat of the compressor 1 and reduce the risk of liquid hammer in the compressor 1.

[0197] like Fig.10 A high-pressure liquid storage tank 5 is used in the thermal management system 100. The high-pressure liquid storage tank 5 can ensure that the refrigerant before entering the throttling device is liquid refrigerant, thereby reducing the refrigerant noise caused by the gas-liquid two-phase refrigerant entering the throttling device due to insufficient heat exchange.

[0198] The thermal management system 100 in the embodiment of the present application includes two high-pressure circuits. High-pressure circuit 1 is: first control valve 2 → external condenser 3 → third control valve 4. High-pressure circuit 2 is: second control valve 10 → internal condenser 11 → second water-cooled heat exchanger 12 → fourth control valve 13.

[0199] The thermal management system 100 in the embodiment of the present application can achieve cooling, dehumidification, and heating of the passenger compartment, and cooling and heating of the battery through a combination of a refrigerant circuit and a water circuit.

[0200] It should be noted that the first duration threshold, the second duration threshold, the third duration threshold, the fourth duration threshold, the fifth duration threshold, the sixth duration threshold, the seventh duration threshold, the eighth duration threshold, the ninth duration threshold, the first preset duration, the second preset duration, the third preset duration, the fourth preset duration, the fifth preset duration, the sixth preset duration, the first pressure threshold, the second pressure threshold, the third pressure threshold, the fourth pressure threshold, the fifth pressure threshold, the sixth pressure threshold, the first speed threshold, the second speed threshold and the third speed threshold in the embodiment of the present application are pre-set by the operation and maintenance personnel, and the embodiment of the present application does not make any specific limitations.

[0201] In addition, an embodiment of the present application further provides a vehicle, including the thermal management system 100 as described above.

Claims

1. A thermal management system, characterized in that: The thermal management system comprises: a compressor and a first circuit and a second circuit connected to an outlet of the compressor; The first circuit includes a first control valve and an external condenser, and the first control valve is connected to the compressor and the external condenser respectively; The second circuit includes a second control valve and a built-in condenser, and the second control valve is connected to the compressor and the built-in condenser respectively; The thermal management system is configured as follows: When the current temperature is less than or equal to the first temperature threshold and the heating condition is started, the first control valve is opened and the second control valve is closed; When the compressor runs for a first time threshold and / or the exhaust pressure of the compressor is greater than or equal to a first pressure threshold, the first control valve is closed and the second control valve is opened.

2. The thermal management system according to claim 1, characterized in that: The thermal management system further includes a cooling fan and an active air intake grille; the thermal management system is further configured as follows: Before the compressor runs for a first time threshold and / or the exhaust pressure of the compressor is greater than or equal to a first pressure threshold, the cooling fan and / or the active air intake grille is closed.

3. The thermal management system according to claim 1 or 2, characterized in that: The thermal management system is further configured as follows: When the current temperature is greater than or equal to the second temperature threshold and the cooling condition is started, opening the first control valve and closing the second control valve; When the exhaust pressure of the compressor is greater than or equal to a second pressure threshold and lasts for a duration greater than or equal to a second duration threshold, the second control valve is opened, and when the second control valve is opened for a first duration, the second control valve is closed.

4. The thermal management system according to claim 1, characterized in that: The thermal management system is further configured as follows: When starting the refrigeration condition, opening the first control valve and the second control valve; When the compressor runs for a third time threshold and / or the exhaust pressure of the compressor is greater than or equal to a third pressure threshold, the second control valve is closed.

5. The thermal management system according to claim 4, characterized in that: The thermal management system is further configured as follows: In a cooling condition, if the suction pressure of the thermal management system is less than or equal to a fourth pressure threshold and the speed of the compressor is less than or equal to a first speed threshold, opening the second control valve; When the opening time of the second control valve is longer than or equal to the first preset time, the second control valve is closed.

6. The thermal management system according to claim 4, characterized in that: The thermal management system further includes a throttling device, and the thermal management system is further configured as follows: Under refrigeration conditions, if the suction superheat of the compressor is less than or equal to the first superheat threshold and the opening of the throttling device is less than or equal to the first opening threshold, the second control valve is opened, and when the opening time of the second control valve is greater than or equal to the fourth time threshold, the second control valve is closed.

7. The thermal management system according to claim 1 or 2, characterized in that: The thermal management system is further configured as follows: Under heating conditions, when the exhaust pressure of the compressor is greater than or equal to the fifth pressure threshold and the compressor speed is less than or equal to the second speed threshold, the compressor is controlled to operate at the target speed and the first control valve is opened; when the opening time of the first control valve is greater than or equal to the second preset time, the first control valve is closed.

8. The thermal management system according to claim 1 or 2, characterized in that: The thermal management system further includes a water-cooled heat exchanger. The thermal management system is further configured as follows: Under heating conditions, when the suction pressure of the compressor is less than or equal to the sixth pressure threshold, the speed of the compressor is less than or equal to the third speed threshold, and the inlet water temperature of the water-cooled heat exchanger is greater than or equal to the third temperature threshold, the first control valve is opened, and when the opening time of the first control valve is greater than or equal to the fifth time threshold, the first control valve is closed.

9. The thermal management system according to claim 1 or 2, characterized in that: The thermal management system further includes a throttling device, and the thermal management system is further configured as follows: Under heating conditions, when the suction superheat of the compressor is less than or equal to the second superheat threshold and the opening of the throttling device is less than or equal to the second opening threshold, the first control valve is opened, and when the opening time of the first control valve is greater than or equal to the sixth time threshold, the first control valve is closed.

10. The thermal management system according to claim 1 or 2, characterized in that: The first circuit also includes a third control valve, a high-pressure liquid storage tank, a first throttling device and a first water-cooled heat exchanger; The inlet of the third control valve is connected to the outlet of the external condenser, and the outlet of the third control valve is connected to the inlet of the high-pressure liquid storage tank; The outlet of the high-pressure liquid storage tank is connected to the inlet of the first throttling device, and the outlet of the first throttling device is connected to the inlet of the first water-cooled heat exchanger; The outlet of the water-cooled heat exchanger is connected to the inlet of the compressor.

11. The thermal management system according to claim 10, characterized in that: The second circuit also includes a second water-cooled heat exchanger, a fourth control valve, a second throttling device and a heat exchanger; The inlet of the second water-cooled heat exchanger is connected to the outlet of the built-in condenser, the outlet of the second water-cooled heat exchanger is connected to the inlet of the fourth control valve, and the outlet of the fourth control valve is connected to the inlet of the high-pressure liquid storage tank; The outlet of the high-pressure liquid storage tank is connected to the inlet of the second throttling device, the outlet of the second throttling device is connected to the inlet of the heat exchanger, and the outlet of the heat exchanger is connected to the inlet of the compressor.

12. A vehicle, characterized in that: The vehicle comprises a thermal management system as claimed in any one of claims 1-11.

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