Thermal management system of vehicle and vehicle

Abstract

The utility model relates to the technical field of thermal management of vehicles, in particular to a thermal management system of a vehicle and the vehicle, and aims to solve the problem that the heating capacity of a thermal management system of an existing new energy vehicle is insufficient in a low-temperature environment. Therefore, the heat management system comprises a compressor, an air conditioning box assembly and a gas-liquid separator, the two ends of the air conditioning box assembly are communicated with an exhaust port of the compressor and an inlet of the gas-liquid separator respectively, an outlet of the gas-liquid separator is communicated with an air return port of the compressor, and the heat management system further comprises a circulating pipe connected with the air conditioning box assembly in parallel. By arranging the circulating pipe, the compressor and the gas-liquid separator form a self-circulation heating loop, so that the compressor can cyclically compress a refrigerant in the self-circulation heating loop, the compression density and the compression temperature of the refrigerant are improved, the flow and the temperature of the refrigerant entering the air conditioning box assembly are improved, and the service life of the air conditioning box assembly is prolonged. The heating capacity of the thermal management system of the vehicle in the low-temperature environment is improved, and the use experience of a user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal management of vehicles, and specifically provides a thermal management system of a vehicle and a vehicle. Background Art

[0002] As vehicles become more mature, the current industry trend has begun to optimize vehicles from multiple R&D directions in order to further improve performance, comfort or environmental friendliness. One of such R&D directions is electric vehicles.

[0003] Electric vehicles mainly use thermal management systems to meet the heating or cooling needs of the passenger compartment. In the prior art, the vehicle thermal management system usually includes a compressor, an outdoor heat exchanger, an indoor evaporator and an indoor condenser. When the passenger compartment needs to be heated, the refrigerant absorbs heat from the outdoor air through the outdoor heat exchanger, and dissipates heat to the passenger compartment through the indoor condenser; when the passenger compartment needs to be cooled, the refrigerant absorbs heat from the passenger compartment through the indoor evaporator, and dissipates heat to the outdoor air through the outdoor heat exchanger.

[0004] When the outdoor ambient temperature is too low, the heat generated by the compressor compressing the refrigerant and the heat that the refrigerant can absorb through the outdoor heat exchanger are limited, and the heating effect is not ideal, resulting in insufficient heating capacity of the thermal management system, which seriously affects the heating effect of the passenger compartment.

[0005] Therefore, this field needs a new technical solution to solve the above problems. Utility Model Content

[0006] The utility model aims to solve the above technical problem, that is, to solve the problem of insufficient heating capacity of the thermal management system of the existing new energy vehicles in a low temperature environment.

[0007] In a first aspect, the utility model provides a thermal management system for a vehicle, the thermal management system comprising a compressor, an air-conditioning box assembly and a gas-liquid separator, the two ends of the air-conditioning box assembly being respectively connected to the exhaust port of the compressor and the inlet of the gas-liquid separator, the outlet of the gas-liquid separator being connected to the return air port of the compressor, the thermal management system further comprising a circulation pipe arranged in parallel with the air-conditioning box assembly, the two ends of the circulation pipe being respectively connected to the exhaust port of the compressor and the inlet of the gas-liquid separator.

[0008] When adopting the above technical solution, the utility model sets a circulation pipe so that the compressor and the gas-liquid separator form a self-circulating heating circuit in parallel with the air-conditioning box assembly, so that a part of the refrigerant can flow through the self-circulating heating circuit, and the compressor can circulate and compress this part of the refrigerant, and this part of the refrigerant is then mixed with the refrigerant flowing through the air-conditioning box assembly and enters the compressor again. The compression density and compression temperature of the mixed refrigerant are significantly improved, thereby increasing the flow rate and temperature of the refrigerant entering the air-conditioning assembly, increasing the heating capacity of the thermal management system of the vehicle in a low temperature environment, and improving the user experience.

[0009] In a preferred technical solution of the above thermal management system, the thermal management system further includes a first expansion valve, and the first expansion valve is arranged in the circulation pipe.

[0010] When adopting the above technical solution, the utility model can accurately control and adjust the flow rate of the refrigerant in the circulation pipe by setting the first expansion valve in the circulation pipe, so as to accurately control the pressure of the compressor, so that the refrigerant in the circulation pipe and the refrigerant in the air-conditioning box assembly are evenly mixed, thereby ensuring the normal operation of the compressor.

[0011] In the preferred technical solution of the above thermal management system, the thermal management system further includes a first pressure sensor and a second pressure sensor, the first pressure sensor is used to detect the intake pressure of the compressor, and the second pressure sensor is used to detect the outlet pressure of the compressor.

[0012] When adopting the above-mentioned technical solution, the utility model can detect the intake pressure and outlet pressure of the compressor in real time by arranging the first pressure sensor and the second pressure sensor at the intake end and the outlet end of the compressor, thereby controlling the pressure of the compressor by adjusting the flow rate of the refrigerant to ensure the normal operation of the compressor.

[0013] In the preferred technical solution of the above-mentioned thermal management system, the air-conditioning box assembly includes an air-conditioning box and a condenser and an evaporator installed in the air-conditioning box, the first end and the second end of the condenser are connected to the exhaust port of the compressor and the first end of the evaporator respectively through the first refrigerant pipe and the second refrigerant pipe, the second end of the evaporator is connected to the inlet of the gas-liquid separator through the third refrigerant pipe, and the second refrigerant pipe is provided with a second expansion valve. The thermal management system also includes an outdoor heat exchanger, the first end and the second end of the outdoor heat exchanger are connected to the second refrigerant pipe and the third refrigerant pipe respectively through the fourth refrigerant pipe and the fifth refrigerant pipe, and the fourth refrigerant pipe is provided with a third expansion valve.

[0014] When adopting the above-mentioned technical scheme, the utility model can control the flow rate of the refrigerant flowing through the second refrigerant pipe, and then control the temperature and pressure of the refrigerant flowing through the evaporator by setting a second expansion valve on the second refrigerant pipe, and by connecting the outdoor heat exchanger and the evaporator in parallel, so that the refrigerant passing through the condenser can enter the outdoor heat exchanger, so that the refrigerant can absorb the heat from the outside, thereby increasing the temperature of the refrigerant refluxed into the gas-liquid separator and the compressor, thereby improving the heating efficiency of the compressor, increasing the heating capacity of the thermal management system of the vehicle in a low temperature environment, and improving the user experience, and by setting a third expansion valve on the fourth refrigerant pipe, the flow rate and temperature of the refrigerant entering the outdoor heat exchanger can be accurately controlled and adjusted, so that the refrigerant entering the outdoor heat exchanger can absorb heat from the external environment, thereby increasing the heating capacity of the thermal management system.

[0015] In the preferred technical solution of the above-mentioned thermal management system, the thermal management system also includes a sixth refrigerant pipe, a seventh refrigerant pipe and a valve assembly, the first end and the second end of the sixth refrigerant pipe are respectively connected to the first refrigerant pipe and the fifth refrigerant pipe, the first end and the second end of the seventh refrigerant pipe are respectively connected to the second refrigerant pipe and the fourth refrigerant pipe, the third expansion valve is located between the connection point between the fourth refrigerant pipe and the second refrigerant pipe and the connection point between the fourth refrigerant pipe and the seventh refrigerant pipe, and the valve assembly is configured to enable the outdoor heat exchanger to be connected in series with the condenser, and to enable the outdoor heat exchanger to be connected in parallel with the condenser.

[0016] When adopting the above technical solution, the utility model connects the outdoor heat exchanger and the condenser in parallel, so that when the vehicle needs cooling, the refrigerant can enter the outdoor heat exchanger for heat exchange after passing through the compressor to reduce the temperature of the refrigerant. The refrigerant cooled by the outdoor heat exchanger then flows through the evaporator to cool the environment inside the vehicle, thereby meeting the user's cooling needs.

[0017] In the preferred technical solution of the above-mentioned thermal management system, the valve assembly includes a first electrically controlled valve arranged on the first refrigerant pipe, a second electrically controlled valve arranged on the fifth refrigerant pipe, a third electrically controlled valve arranged on the sixth refrigerant pipe, a first one-way valve arranged on the second refrigerant pipe, and a second one-way valve arranged on the seventh refrigerant pipe, the first electrically controlled valve is located between the connection point of the first refrigerant pipe and the sixth refrigerant pipe and the first end of the condenser, the first electrically controlled valve can control the on-off state of the first refrigerant pipe, the second electrically controlled valve is located between the connection point of the fifth refrigerant pipe and the sixth refrigerant pipe to the connection point of the fifth refrigerant pipe and the third refrigerant pipe, the second electrically controlled valve can control the on-off state of the fifth refrigerant pipe, the third electrically controlled valve can control the on-off state of the sixth refrigerant pipe, the first one-way valve is located between the connection point of the second refrigerant pipe and the seventh refrigerant pipe to the second end of the condenser, the first one-way valve is conducted in a direction away from the second end of the condenser, and the second one-way valve is conducted in a direction from the second end of the seventh refrigerant pipe toward the first end.

[0018] When adopting the above technical solution, the utility model controls the on-off state of the first refrigerant pipe through the first electric control valve, controls the on-off state of the fifth refrigerant pipe through the second electric control valve, controls the on-off state of the sixth refrigerant pipe through the third electric control valve, and the first one-way valve is turned on in the direction away from the second end of the condenser, and the second one-way valve is turned on in the direction from the second end of the seventh refrigerant pipe toward the first end, thereby realizing parallel connection between the outdoor heat exchanger and the condenser, thereby meeting the user's cooling needs.

[0019] In the preferred technical solution of the above-mentioned thermal management system, the thermal management system also includes a first fan, which is arranged close to the outdoor heat exchanger; and / or the air-conditioning box assembly also includes a second fan installed in the air-conditioning box, which is arranged close to the evaporator.

[0020] When adopting the above technical solution, the utility model improves the heat exchange efficiency by arranging a first fan in the outdoor heat exchanger, and accelerates the heat exchange between the thermal management system and the vehicle interior environment by arranging a second fan in the air-conditioning box, thereby improving the heat exchange efficiency.

[0021] In the preferred technical solution of the above-mentioned thermal management system, the thermal management system also includes a battery cooler, the two ends of the battery cooler are connected to the second refrigerant pipe and the third refrigerant pipe through the eighth refrigerant pipe and the ninth refrigerant pipe respectively, the second expansion valve is located between the connection point of the second refrigerant pipe and the eighth refrigerant pipe and the first end of the evaporator, and the fourth expansion valve is provided on the eighth refrigerant pipe.

[0022] When adopting the above technical solution, the utility model connects the battery cooler and the evaporator in parallel through the eighth refrigerant pipe and the ninth refrigerant pipe, so that the refrigerant can flow through the battery cooler and then enter the gas-liquid separator. Such a setting can not only cool the temperature of the battery, but also absorb the heat of the battery, thereby increasing the heat of the refrigerant refluxed into the gas-liquid separator, and thus increasing the heating capacity of the thermal management system. By arranging the fourth expansion valve on the eighth refrigerant pipe, the flow rate of the refrigerant flowing through the battery cooler can be accurately controlled.

[0023] In the preferred technical solution of the above-mentioned thermal management system, the thermal management system also includes a third one-way valve arranged on the third refrigerant pipe, the third one-way valve is located between the second end of the evaporator and the connection point between the third refrigerant pipe and the ninth refrigerant pipe, and the third one-way valve is conductive in the direction away from the second end of the evaporator; or the thermal management system also includes a fourth electrically-controlled valve arranged on the third refrigerant pipe, the fourth electrically-controlled valve is located between the second end of the evaporator and the connection point between the third refrigerant pipe and the ninth refrigerant pipe, and the fourth electrically-controlled valve can control the on and off state of the third refrigerant pipe.

[0024] When the above technical solution is adopted, the utility model can prevent the refrigerant flowing out of the battery cooler from entering the evaporator by arranging the third one-way valve on the third refrigerant pipe, thereby affecting the heat exchange efficiency of the thermal management system.

[0025] In a second aspect, the utility model also provides a vehicle, comprising the above-mentioned thermal management system.

[0026] Under the condition of adopting the above technical scheme, the vehicle of the utility model has the beneficial effects of the above thermal management system because it includes the above thermal management system. In the prior art, a PTC heater is arranged in the air-conditioning box assembly, and the heating capacity is increased by heating the PTC heater and the air-conditioning system at the same time, thereby meeting the heating capacity demand of the thermal management system of the vehicle in a low-temperature environment. Compared with the vehicle before the improvement, the vehicle of the utility model cancels the PTC heater and increases the heating capacity by the self-circulation heating of the compressor, so that the thermal management system can still meet the heating capacity demand in a low-temperature environment without setting the PTC heater, thus saving energy. The space inside the air-conditioning box assembly is saved. Specifically, the thermal management system of the vehicle of the utility model is provided with a circulation pipe, so that the compressor and the gas-liquid separator form a self-circulating heating circuit in parallel with the air-conditioning box assembly, so that a part of the refrigerant flows through the self-circulating heating circuit, and the compressor can circulate and compress this part of the refrigerant, and this part of the refrigerant is then mixed with the refrigerant flowing through the air-conditioning box assembly and enters the compressor again. The compression density and compression temperature of the mixed refrigerant are significantly improved, thereby increasing the flow rate and temperature of the refrigerant entering the air-conditioning assembly, increasing the heating capacity of the thermal management system of the vehicle in a low temperature environment, and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0028] Figure 1 It is a schematic diagram of the principle of the thermal management system of the vehicle of the utility model;

[0029] Figure 2 It is a schematic diagram of the principle of the thermal management system of the vehicle of the utility model in the dehumidification mode;

[0030] Figure 3 It is a schematic diagram of the principle of the thermal management system of the vehicle of the utility model in the heating mode;

[0031] Figure 4 It is a schematic diagram of the principle of the thermal management system of the vehicle of the utility model in the cooling mode;

[0032] Figure 5 It is a schematic diagram of the principle of the thermal management system of the vehicle of the present invention in the low-load heating mode.

[0033] List of reference numerals:

[0034] 1. Compressor;

[0035] 21. Evaporator; 22. Condenser; 23. Circulation pipe; 24. Outdoor heat exchanger;

[0036] 3. Gas-liquid separator;

[0037] 41. first refrigerant pipe; 42. second refrigerant pipe; 43. third refrigerant pipe; 44. fourth refrigerant pipe; 45. fifth refrigerant pipe; 46. sixth refrigerant pipe; 47. seventh refrigerant pipe; 48. eighth refrigerant pipe; 49. ninth refrigerant pipe;

[0038] 51, first expansion valve; 52, second expansion valve; 53, third expansion valve; 54, fourth expansion valve; 55, first electric control valve; 56, second electric control valve; 57, third electric control valve; 58, first check valve; 59, second check valve; 510, third check valve;

[0039] 61. A first pressure sensor; 62. A second pressure sensor;

[0040] 71. a first fan; 72. a second fan;

[0041] 8. Battery cooler. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0043] It should be noted that in the description of the present invention, the terms "inside", "outside", "upper", "lower", "left", "right" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth" and "ninth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "connect", and "install" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] Based on the problem pointed out in the background technology that the heating capacity of the thermal management system of existing new energy vehicles is insufficient in low-temperature environments, the utility model provides a thermal management system and a vehicle of a vehicle, aiming to form a self-circulating heating loop by arranging a circulation pipe so that the compressor and the gas-liquid separator form a self-circulating heating loop, so that the compressor can circulate and compress the refrigerant in the self-circulating heating loop, thereby increasing the compression density and compression temperature of the refrigerant, thereby increasing the flow rate and temperature of the refrigerant entering the air-conditioning assembly, increasing the heating capacity of the thermal management system of the vehicle in low-temperature environments, and improving the user experience.

[0046] Specifically, Figure 1 As shown, the thermal management system of the utility model includes a compressor 1, an air-conditioning box assembly and a gas-liquid separator 3, the two ends of the air-conditioning box assembly are respectively connected to the exhaust port of the compressor 1 and the inlet of the gas-liquid separator 3, the outlet of the gas-liquid separator 3 is connected to the return air port of the compressor 1, and the thermal management system also includes a circulation pipe 23 arranged in parallel with the air-conditioning box assembly, and the two ends of the circulation pipe 23 are respectively connected to the exhaust port of the compressor 1 and the inlet of the gas-liquid separator 3.

[0047] For example, Figure 1 As shown, the compressor 1, the air conditioning box assembly and the gas-liquid separator 3 of the utility model form a refrigerant circuit, the two ends of the air conditioning box assembly are respectively connected to the exhaust port of the compressor 1 and the inlet of the gas-liquid separator 3, the outlet of the gas-liquid separator 3 is connected to the return air port of the compressor 1, and the heat exchange between the thermal management system and the vehicle interior environment can be realized through the above circuit, the two ends of the circulation pipe 23 are respectively connected to the exhaust port of the compressor 1 and the inlet of the gas-liquid separator 3, so that the compressor 1 and the gas-liquid separator 3 form a self-circulating heating circuit through the circulation pipe 23, and by setting the circulation pipe 23 in parallel with the air conditioning box assembly, a part of the refrigerant can flow through the self-circulating heating circuit, and the compressor 1 can circulate and compress this part of the refrigerant, and this part of the refrigerant is mixed with the refrigerant flowing through the air conditioning box assembly and enters the compressor 1 again, and the compression density and compression temperature of the mixed refrigerant are significantly improved, thereby increasing the flow rate and temperature of the refrigerant entering the air conditioning assembly, increasing the heating capacity of the vehicle thermal management system in a low temperature environment, and improving the user experience.

[0048] It should be noted that the self-circulating heating circuit of the present invention can be turned on and off. For example, technical personnel in this field can turn on and off the self-circulating heating circuit according to actual usage. When the heating capacity of the vehicle meets the demand, the self-circulating heating circuit can be turned off. When the vehicle is in a low temperature environment and the heating capacity is insufficient, the self-circulating heating circuit can be turned on to increase the heating capacity of the thermal management system, etc. Such flexible adjustments and changes do not deviate from the principle and scope of the present invention and should be limited within the protection scope of the present invention.

[0049] It should also be noted that the opening and closing functions of the self-circulating heating circuit of the utility model can be achieved by setting a valve. For example, a technician in this field can set a flow valve or an electronic expansion valve, etc. in the circulation pipe 23. Such flexible adjustment and change does not deviate from the principle and scope of the utility model and should be limited within the protection scope of the utility model.

[0050] Preferably, if Figure 1 As shown, the thermal management system of the present invention further includes a first expansion valve 51 , which is disposed in the circulation pipe 23 .

[0051] For example, Figure 1 As shown, a first expansion valve 51 is provided at one end of the circulation pipe 23 of the utility model close to the exhaust port of the compressor 1. By providing the first expansion valve 51, the flow rate of the refrigerant in the circulation pipe 23 can be accurately controlled and adjusted, so that the pressure of the compressor 1 can be accurately controlled, so that the refrigerant in the circulation pipe 23 is evenly mixed with the refrigerant in the air-conditioning box assembly, thereby ensuring the normal operation of the compressor 1.

[0052] Preferably, if Figure 1 As shown, the thermal management system of the present invention further includes a first pressure sensor 61 and a second pressure sensor 62 . The first pressure sensor 61 is used to detect the intake pressure of the compressor 1 , and the second pressure sensor 62 is used to detect the outlet pressure of the compressor 1 .

[0053] For example, Figure 1 As shown, the first pressure sensor 61 of the utility model is arranged at one end close to the return air port of the compressor 1 to detect the intake pressure of the compressor 1, and the second pressure sensor 62 is arranged at one end close to the exhaust port of the compressor 1 to detect the outlet pressure of the compressor 1, so as to control the pressure of the compressor 1 by adjusting the flow rate of the refrigerant to ensure the normal operation of the compressor 1.

[0054] Preferably, if Figure 2 As shown, the air-conditioning box assembly of the utility model includes an air-conditioning box and a condenser 22 and an evaporator 21 installed in the air-conditioning box. The first end and the second end of the condenser 22 are connected to the exhaust port of the compressor 1 and the first end of the evaporator 21 respectively through the first refrigerant pipe 41 and the second refrigerant pipe 42, and the second end of the evaporator 21 is connected to the inlet of the gas-liquid separator 3 through the third refrigerant pipe 43. The second refrigerant pipe 42 is provided with a second expansion valve 52. The thermal management system also includes an outdoor heat exchanger 24. The first end and the second end of the outdoor heat exchanger 24 are connected to the second refrigerant pipe 42 and the third refrigerant pipe 43 through the fourth refrigerant pipe 44 and the fifth refrigerant pipe 45 respectively, and the fourth refrigerant pipe 44 is provided with a third expansion valve 53.

[0055] For example, Figure 2As shown, the air-conditioning box of the utility model is equipped with a connected condenser 22 and an evaporator 21, the right end and the left end of the condenser 22 are connected to the exhaust port of the compressor 1 and the left end of the evaporator 21 respectively through the first refrigerant pipe 41 and the second refrigerant pipe 42, the right end of the evaporator 21 is connected to the inlet of the gas-liquid separator 3 through the third refrigerant pipe 43, the second refrigerant pipe 42 is provided with a second expansion valve 52, the thermal management system also includes an outdoor heat exchanger 24, the left end and the right end of the outdoor heat exchanger 24 are connected to the second refrigerant pipe 42 and the third refrigerant pipe 43 through the fourth refrigerant pipe 44 and the fifth refrigerant pipe 45 respectively, and the fourth refrigerant pipe 44 is provided with a third expansion valve 53.

[0056] The technical solution of the present invention will be further described below through the working modes of the vehicle's thermal management system under different working conditions.

[0057] Dehumidification mode:

[0058] like Figure 2 As shown, in spring and autumn when the interior of the car is in a cold and humid environment, the user starts the air-conditioning system and selects the dehumidification mode. At this time, the second expansion valve 52 is opened and the third expansion valve 53 is closed. The specific refrigerant circuit is: the high-temperature and high-pressure refrigerant enters the condenser 22 from the exhaust port of the compressor 1, and the temperature of the passenger compartment is heated by the condenser 22. At this time, the refrigerant temperature is reduced, and then the refrigerant is adjusted in flow and pressure by the second expansion valve 52, so that when the refrigerant flows through the evaporator 21, the temperature of the evaporator 21 will not be lower than 0°C, and it can absorb heat from the humid and hot gas in the passenger compartment and condense the water vapor in the humid and hot gas, thereby achieving the effect of heating and dehumidification. Finally, the refrigerant flows back to the gas-liquid separator 3 and enters the compressor 1 again for the next cycle.

[0059] It should be noted that in the dehumidification mode, technical personnel in this field can control whether to turn on the self-circulation heating circuit according to the temperature requirements in the passenger compartment. For example, if the heating capacity in the passenger compartment is insufficient and the temperature requirements cannot be met, the self-circulation heating circuit can be turned on to increase the heating capacity.

[0060] It should also be noted that the second expansion valve 52 can control the temperature and flow rate of the refrigerant flowing into the evaporator 21. When the compressor 1 runs at high speed, the temperature of the evaporator 21 will be lower than 0°C. At this time, frost will appear on the evaporator 21. The second expansion valve 52 can ensure that the temperature of the evaporator 21 will not be lower than 0°C.

[0061] Heating mode:

[0062] like Figure 3As shown, when the vehicle is in a cold environment in winter, the user starts the air-conditioning system and selects the heating mode. At this time, the second expansion valve 52 is closed and the third expansion valve 53 is opened. The specific refrigerant circuit is: the high-temperature and high-pressure refrigerant enters the condenser 22 from the exhaust port of the compressor 1, and the temperature of the passenger compartment is heated by the condenser 22. At this time, the refrigerant temperature is reduced, and then the flow and pressure are adjusted by the third expansion valve 53 and then flow through the outdoor heat exchanger 24. The refrigerant can exchange heat with the external environment through the outdoor heat exchanger 24, thereby increasing the temperature of the refrigerant. Finally, the refrigerant flows back to the gas-liquid separator 3 and enters the compressor 1 again for the next cycle.

[0063] It should be noted that in the heating mode, technical personnel in this field can control whether to turn on the self-circulation heating circuit according to the temperature requirements in the passenger compartment. For example, if the heating capacity in the passenger compartment is insufficient and the temperature requirements are not met, the self-circulation heating circuit can be turned on to increase the heating capacity.

[0064] It should also be noted that the third expansion valve 53 can control the temperature and flow rate of the refrigerant flowing into the outdoor heat exchanger 24, so that the temperature of the refrigerant flowing through the outdoor heat exchanger 24 can be lower than the temperature of the external environment, ensuring that the refrigerant can absorb heat from the external environment, thereby improving the heating efficiency of the thermal management system.

[0065] Preferably, if Figure 1 As shown, the thermal management system of the present invention also includes a sixth refrigerant pipe 46, a seventh refrigerant pipe 47 and a valve assembly. The first end and the second end of the sixth refrigerant pipe 46 are respectively connected to the first refrigerant pipe 41 and the fifth refrigerant pipe 45, the first end and the second end of the seventh refrigerant pipe 47 are respectively connected to the second refrigerant pipe 42 and the fourth refrigerant pipe 44, the third expansion valve 53 is located between the connection point between the fourth refrigerant pipe 44 and the second refrigerant pipe 42 and the connection point between the fourth refrigerant pipe 44 and the seventh refrigerant pipe 47, and the valve assembly is configured to enable the outdoor heat exchanger 24 to be connected in series with the condenser 22, and to enable the outdoor heat exchanger 24 to be connected in parallel with the condenser 22.

[0066] For example, Figure 1 As shown, the lower end and upper end of the sixth refrigerant pipe 46 of the utility model are respectively connected to the first refrigerant pipe 41 and the fifth refrigerant pipe 45, the lower end and upper end of the seventh refrigerant pipe 47 are respectively connected to the second refrigerant pipe 42 and the fourth refrigerant pipe 44, and the third expansion valve 53 is located between the connection point between the fourth refrigerant pipe 44 and the second refrigerant pipe 42 and the connection point between the fourth refrigerant pipe 44 and the seventh refrigerant pipe 47. The outdoor heat exchanger 24 and the condenser 22 can be connected in series and in parallel through the valve assembly.

[0067] That is, the outdoor heat exchanger 24 and the condenser 22 can be connected in series on one refrigerant circuit through the valve assembly, or the outdoor heat exchanger 24 and the condenser 22 can be connected in parallel on two refrigerant circuits.

[0068] Preferably, if Figure 1 As shown, the valve assembly of the utility model includes a first electrically controlled valve 55 arranged on the first refrigerant pipe 41, a second electrically controlled valve 56 arranged on the fifth refrigerant pipe 45, a third electrically controlled valve 57 arranged on the sixth refrigerant pipe 46, a first non-return valve 58 arranged on the second refrigerant pipe 42, and a second non-return valve 59 arranged on the seventh refrigerant pipe 47. The first electrically controlled valve 55 is located between the connection point of the first refrigerant pipe 41 and the sixth refrigerant pipe 46 and the first end of the condenser 22. The first electrically controlled valve 55 can control the on-off state of the first refrigerant pipe 41, and the second electrically controlled valve 56 can control the on-off state of the first refrigerant pipe 41. Located between the connection point of the fifth refrigerant pipe 45 and the sixth refrigerant pipe 46 and the connection point of the fifth refrigerant pipe 45 and the third refrigerant pipe 43, the second electric-controlled valve 56 can control the on-off state of the fifth refrigerant pipe 45, and the third electric-controlled valve 57 can control the on-off state of the sixth refrigerant pipe 46. The first one-way valve 58 is located between the connection point of the second refrigerant pipe 42 and the seventh refrigerant pipe 47 and the second end of the condenser 22. The first one-way valve 58 is conductive in the direction away from the second end of the condenser 22, and the second one-way valve 59 is conductive in the direction from the second end of the seventh refrigerant pipe 47 toward the first end.

[0069] For example, Figure 1 As shown, the first electrically controlled valve 55 of the utility model is located between the connection point of the first refrigerant tube 41 and the sixth refrigerant tube 46 and the right end of the condenser 22, the first electrically controlled valve 55 can control the on-off state of the first refrigerant tube 41, the second electrically controlled valve 56 is located between the connection point of the fifth refrigerant tube 45 and the sixth refrigerant tube 46 to the connection point of the fifth refrigerant tube 45 and the third refrigerant tube 43, the second electrically controlled valve 56 can control the on-off state of the fifth refrigerant tube 45, the third electrically controlled valve 57 can control the on-off state of the sixth refrigerant tube 46, the first one-way valve 58 is located between the connection point of the second refrigerant tube 42 and the seventh refrigerant tube 47 and the left end of the condenser 22, the first one-way valve 58 is conductive in the direction from bottom to top, and the second one-way valve 59 is conductive in the direction from top to bottom.

[0070] The refrigeration function of the thermal management system is realized by the arrangement of the sixth refrigerant pipe 46, the seventh refrigerant pipe 47 and the valve assembly.

[0071] Cooling mode:

[0072] like Figure 4As shown, when the car is in a hot environment in summer, the user starts the air-conditioning system and selects the cooling mode. At this time, the third electrically controlled valve 57, the second one-way valve 59 and the second expansion valve 52 are opened, and the third expansion valve 53, the first electrically controlled valve 55, the first one-way valve 58 and the second electrically controlled valve 56 are closed. The specific refrigerant circuit is: the high-temperature and high-pressure refrigerant enters the outdoor heat exchanger 24 from the exhaust port of the compressor 1 through the third electrically controlled valve 57, exchanges heat with the external environment through the outdoor heat exchanger 24, and thus becomes a refrigerant in a low-temperature state. The refrigerant in a low-temperature state then flows through the evaporator 21 through the second expansion valve 52, exchanges heat with the passenger compartment through the evaporator 21, thereby achieving the purpose of cooling. The refrigerant that has completed the heat exchange flows back to the gas-liquid separator 3 and enters the compressor 1 again for the next cycle.

[0073] When the user has different requirements for the air outlet temperature in the passenger compartment, the first electrically controlled valve 55 and the first one-way valve 58 are opened to connect the outdoor heat exchanger 24 and the condenser 22 in parallel, and the high-temperature refrigerant flows through the condenser 22 and the outdoor heat exchanger 24 respectively, and then passes through the first one-way valve 58 and the second one-way valve 59 respectively to be mixed together. At this time, the air outlet temperature can be adjusted by controlling the flow rate of the refrigerant flowing through the condenser 22, thereby meeting the requirements for different air outlet temperatures in the passenger compartment.

[0074] That is, the outlet air temperature is controlled and adjusted by controlling the flow rate of the refrigerant flowing out of the exhaust port of the compressor 1 through the condenser 22, thereby meeting the multi-temperature zone requirements of the passenger compartment.

[0075] Preferably, if Figure 1 As shown, the thermal management system of the present invention further includes a first fan 71 , which is disposed close to the outdoor heat exchanger 24 .

[0076] By providing the first fan 71 in the outdoor heat exchanger 24, the heat exchange efficiency can be improved.

[0077] Preferably, if Figure 1 As shown, the air conditioning box assembly of the utility model further includes a second fan 72 installed in the air conditioning box, and the second fan 72 is arranged close to the evaporator 21 .

[0078] By providing the second fan 72 , the heat exchange between the thermal management system and the vehicle interior environment can be accelerated, and the condenser 22 can also be cooperated to achieve multi-temperature zone regulation.

[0079] Preferably, if Figure 1As shown, the thermal management system of the utility model also includes a battery cooler 8, the two ends of which are connected to the second refrigerant pipe 42 and the third refrigerant pipe 43 through the eighth refrigerant pipe 48 and the ninth refrigerant pipe 49 respectively, the second expansion valve 52 is located between the connection point between the second refrigerant pipe 42 and the eighth refrigerant pipe 48 and the first end of the evaporator 21, and the fourth expansion valve 54 is provided on the eighth refrigerant pipe 48.

[0080] For example, Figure 1 As shown, the left end of the battery cooler 8 of the utility model is connected to the second refrigerant pipe 42 through the eighth refrigerant pipe 48, the right end of the battery cooler 8 is connected to the third refrigerant pipe 43 through the ninth refrigerant pipe 49, the second expansion valve 52 is located between the connection point between the second refrigerant pipe 42 and the eighth refrigerant pipe 48 and the left end of the evaporator 21, and the fourth expansion valve 54 is provided on the eighth refrigerant pipe 48.

[0081] By connecting the battery cooler 8 and the evaporator 21 in parallel, the thermal management system can exchange heat with the heat generated by the power battery of the vehicle. Specifically:

[0082] In the dehumidification mode, the refrigerant flowing out of the condenser 22 flows back into the gas-liquid separator 3 through the evaporator 21 in one way and flows back into the gas-liquid separator 3 through the battery cooler 8 in the other way. The refrigerant passing through the battery cooler 8 can cool the battery and absorb the heat of the battery, thereby increasing the heating capacity of the thermal management system.

[0083] In the heating mode, the refrigerant flowing out of the condenser 22 flows back into the gas-liquid separator 3 through the outdoor heat exchanger 24 in one way and flows back into the gas-liquid separator 3 through the battery cooler 8 in the other way. The refrigerant passing through the battery cooler 8 can cool the battery and absorb the heat of the battery, thereby increasing the heating capacity of the thermal management system.

[0084] In cooling mode, the refrigerant from the outdoor heat exchanger 24 flows back into the gas-liquid separator 3 through the evaporator 21 in one way and flows back into the gas-liquid separator 3 through the battery cooler 8 in the other way. The refrigerant passing through the battery cooler 8 can cool the battery and absorb the heat of the battery.

[0085] It should be noted that, in the heating mode, the refrigerant flowing out of the condenser 22 flows back into the gas-liquid separator 3 through the outdoor heat exchanger 24, flows back into the gas-liquid separator 3 through the battery cooler 8, and the self-circulation heating circuit is started. The three heating circuits can be freely combined. That is to say, in the heating mode, one of the refrigerant circuits can be activated separately, two of the refrigerant circuits can be activated at the same time, or three refrigerant circuits can be activated at the same time, etc., as long as the heating amount of the passenger compartment can be achieved according to actual usage requirements, such flexible adjustment and change does not deviate from the principle and scope of the utility model, and should be limited within the protection scope of the utility model.

[0086] It should also be noted that the fourth expansion valve 54 can control the temperature and flow rate of the refrigerant flowing into the battery cooler 8, so that the temperature of the refrigerant flowing through the battery cooler 8 can be lower than the temperature of the power battery of the vehicle, ensuring that the refrigerant can absorb the heat generated by the power battery of the vehicle, thereby reducing the temperature of the power battery of the vehicle.

[0087] Among them, the low-load heating mode is a type of heating mode.

[0088] Low load heating mode:

[0089] like Figure 5 As shown, when the heating demand in the passenger compartment is not much, for example, when the heating demand in the passenger compartment is less than 200W, the first electrically controlled valve 55, the first non-return valve 58 and the fourth expansion valve 54 are opened, and the second electrically controlled valve 56, the third electrically controlled valve 57, the second expansion valve 52, the third expansion valve 53 and the second non-return valve 59 are closed. At this time, the refrigerant circuit is: the refrigerant flowing out of the condenser 22 flows through the battery cooler 8 through the fourth expansion valve 54 and flows back into the gas-liquid separator 3, and then the self-circulation heating circuit is started to meet the heating demand of the passenger compartment. At this time, the speed and power of the compressor 1 are reduced, thereby reducing energy consumption.

[0090] Preferably, if Figure 1 As shown, the thermal management system of the utility model also includes a third one-way valve 510 arranged on the third refrigerant pipe 43. The third one-way valve 510 is located between the second end of the evaporator 21 and the connection point between the third refrigerant pipe 43 and the ninth refrigerant pipe 49. The third one-way valve 510 is conductive in the direction away from the second end of the evaporator 21.

[0091] For example, Figure 1 As shown, the third one-way valve 510 of the utility model is located between the right end of the evaporator 21 (the second end of the evaporator 21) and the connection point between the third refrigerant pipe 43 and the ninth refrigerant pipe 49, and the third one-way valve 510 is conducted in the direction away from the right end of the evaporator 21 (from left to right). Through such a setting, the refrigerant flowing out of the battery cooler 8 can be prevented from entering the evaporator 21, thereby affecting the heat exchange efficiency of the thermal management system.

[0092] It should be noted that the present invention does not limit the type of valve provided on the third refrigerant pipe 43. For example, a person skilled in the art may also replace the third one-way valve 510 provided on the third refrigerant pipe 43 with an electric control valve, etc. Such flexible adjustment and change does not deviate from the principle and scope of the present invention and shall be limited within the protection scope of the present invention.

[0093] It should also be noted that the first electrically controlled valve 55, the second electrically controlled valve 56 and the third electrically controlled valve 57 of the utility model have the functions of conduction and cutoff, and also have the function of throttling, so as to control the flow rate of the refrigerant and adjust the cooling capacity and heating capacity of the thermal management system.

[0094] It should be further explained that the first one-way valve 58, the second one-way valve 59 and the third one-way valve 510 of the present invention have a one-way conduction function, thereby being able to control the flow direction of the refrigerant in the pipeline.

[0095] Those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments may be used in any combination.

[0096] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A thermal management system for a vehicle, comprising a compressor, an air conditioning box assembly and a gas-liquid separator, wherein two ends of the air conditioning box assembly are respectively connected to the exhaust port of the compressor and the inlet of the gas-liquid separator, and the outlet of the gas-liquid separator is connected to the return air port of the compressor, characterized in that: The thermal management system further comprises a circulation pipe which is arranged in parallel with the air conditioning box assembly, and two ends of the circulation pipe are respectively connected with the exhaust port of the compressor and the inlet of the gas-liquid separator.

2. The thermal management system according to claim 1, characterized in that: The thermal management system further includes a first expansion valve disposed in the circulation pipe.

3. The thermal management system according to claim 1, characterized in that: The thermal management system further includes a first pressure sensor and a second pressure sensor, wherein the first pressure sensor is used to detect an intake pressure of the compressor, and the second pressure sensor is used to detect an outlet pressure of the compressor.

4. The thermal management system according to claim 1, characterized in that: The air conditioning box assembly includes an air conditioning box and a condenser and an evaporator installed in the air conditioning box. The first end and the second end of the condenser are respectively connected to the exhaust port of the compressor and the first end of the evaporator through a first refrigerant pipe and a second refrigerant pipe, respectively. The second end of the evaporator is connected to the inlet of the gas-liquid separator through a third refrigerant pipe. The second refrigerant pipe is provided with a second expansion valve. The thermal management system also includes an outdoor heat exchanger, the first end and the second end of the outdoor heat exchanger are connected to the second refrigerant pipe and the third refrigerant pipe through a fourth refrigerant pipe and a fifth refrigerant pipe respectively, and the fourth refrigerant pipe is provided with a third expansion valve.

5. The thermal management system according to claim 4, characterized in that: The thermal management system further includes a sixth refrigerant pipe, a seventh refrigerant pipe and a valve assembly. The first end and the second end of the sixth refrigerant pipe are respectively connected to the first refrigerant pipe and the fifth refrigerant pipe, the first end and the second end of the seventh refrigerant pipe are respectively connected to the second refrigerant pipe and the fourth refrigerant pipe, the third expansion valve is located between the connection point between the fourth refrigerant pipe and the second refrigerant pipe and the connection point between the fourth refrigerant pipe and the seventh refrigerant pipe, and the valve assembly is configured as: The outdoor heat exchanger and the condenser can be connected in series or in parallel.

6. The thermal management system according to claim 5, characterized in that: The valve assembly includes a first electrically controlled valve disposed on the first refrigerant pipe, a second electrically controlled valve disposed on the fifth refrigerant pipe, a third electrically controlled valve disposed on the sixth refrigerant pipe, a first one-way valve disposed on the second refrigerant pipe, and a second one-way valve disposed on the seventh refrigerant pipe. The first electrically controlled valve is located between the connection point of the first refrigerant tube and the sixth refrigerant tube and the first end of the condenser, and the first electrically controlled valve can control the on-off state of the first refrigerant tube. The second electrically controlled valve is located between the connection point of the fifth refrigerant tube and the sixth refrigerant tube and the connection point of the fifth refrigerant tube and the third refrigerant tube, and the second electrically controlled valve can control the on-off state of the fifth refrigerant tube. The third electrically controlled valve can control the on-off state of the sixth refrigerant tube. The first one-way valve is located between the connection point of the second refrigerant tube and the seventh refrigerant tube and the second end of the condenser, and the first one-way valve is conductive in a direction away from the second end of the condenser, and the second one-way valve is conductive in a direction from the second end of the seventh refrigerant tube toward the first end.

7. The thermal management system according to claim 4, characterized in that: The thermal management system further comprises a first fan, wherein the first fan is arranged close to the outdoor heat exchanger; and / or The air conditioning box assembly also includes a second fan installed in the air conditioning box, and the second fan is arranged close to the evaporator.

8. The thermal management system according to claim 4, characterized in that: The thermal management system also includes a battery cooler, the two ends of which are connected to the second refrigerant pipe and the third refrigerant pipe through an eighth refrigerant pipe and a ninth refrigerant pipe respectively, the second expansion valve is located between the connection point between the second refrigerant pipe and the eighth refrigerant pipe and the first end of the evaporator, and a fourth expansion valve is provided on the eighth refrigerant pipe.

9. The thermal management system according to claim 8, characterized in that: The thermal management system further comprises a third one-way valve disposed on the third refrigerant pipe, the third one-way valve being located between the second end of the evaporator and a connection point between the third refrigerant pipe and the ninth refrigerant pipe, the third one-way valve being conductive in a direction away from the second end of the evaporator; or The thermal management system also includes a fourth electrically controlled valve arranged on the third refrigerant pipe, and the fourth electrically controlled valve is located between the second end of the evaporator and the connection point between the third refrigerant pipe and the ninth refrigerant pipe. The fourth electrically controlled valve can control the on and off state of the third refrigerant pipe.

10. A vehicle, characterized in that: The vehicle comprises the thermal management system of any one of claims 1 to 9.

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