Thermal management circuit for an electric vehicle

Abstract

The application relates to the technical field of temperature control, and provides a thermal management circuit of an electric vehicle, which comprises a motor water pump, a heat generating device of the electric vehicle and a heat pump air conditioner; the outlet of the motor water pump is connected with the inlet of the heat generating device; the outlet of the heat generating device is connected with the first cooling liquid inlet of a cooler of the heat pump air conditioner; the first cooling liquid outlet of the cooler is connected with the inlet of the motor water pump; the heat generating device comprises a power supply device and an electric drive device. The thermal management circuit of the electric vehicle provided by the application can improve the energy efficiency ratio of the heat pump air conditioner during heating execution, and improve the cruising range of the electric vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of temperature control, in particular to a thermal management circuit of an electric vehicle. BACKGROUND

[0002] Thermal management refers to adjusting and controlling the temperature or temperature difference of a specific object by using heating or cooling means. In the related art, the thermal management of an electric vehicle is performed by using a direct heat pump air conditioner, and the outdoor heat exchanger of the heat pump air conditioner retains a liquid accumulator and an outdoor heat exchanger supercooling section, thereby solving the problem of performance reduction of the heat pump air conditioner compared with a non-heat pump air conditioner in a refrigeration working condition. However, when the heat pump air conditioner performs heating, the use of the heat pump is limited due to the influence of the vehicle, and a PTC air heater needs to be added in the passenger compartment, which will consume a large amount of energy of the vehicle, resulting in low heating energy efficiency ratio and affecting the cruising range of the electric vehicle. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, the present application provides a thermal management circuit of an electric vehicle, which can improve the energy efficiency ratio of the heat pump air conditioner when performing heating and improve the cruising range of the electric vehicle.

[0004] The present application also provides an electric vehicle.

[0005] According to the thermal management circuit of the electric vehicle of the first aspect of the present application, the thermal management circuit comprises:

[0006] a motor water pump, a heat generating device of the electric vehicle, and a heat pump air conditioner;

[0007] an outlet of the motor water pump is connected with an inlet of the heat generating device, an outlet of the heat generating device is connected with a first cooling liquid inlet of a cooler of the heat pump air conditioner, and a first cooling liquid outlet of the cooler is connected with an inlet of the motor water pump;

[0008] the heat generating device comprises a power supply device and an electric drive device.

[0009] By connecting the outlet of the motor water pump with the inlet of the heat generating device, connecting the outlet of the heat generating device with the first cooling liquid inlet of the cooler of the heat pump air conditioner, and connecting the first cooling liquid outlet of the cooler with the inlet of the motor water pump, when the heat pump air conditioner of the electric vehicle performs heating, the waste heat of the heat generating device can be absorbed by the cooling liquid of the cooler in the heat pump air conditioner, and the cooling liquid absorbing the waste heat is exchanged by the cooler to provide heat energy for the heat pump air conditioner, so that the heat pump air conditioner uses the waste heat of the heat generating device to perform heating, thereby the waste heat generated by the heat generating device can be used as a low-temperature heat source when the heat pump air conditioner performs heating, the energy consumption of the vehicle is reduced, the energy efficiency utilization rate is improved, and the cruising range of the electric vehicle is increased.

[0010] According to one embodiment of the present application, further comprising: a first four-way valve;

[0011] The first four-way valve is arranged on a connecting pipeline between the outlet of the heat generating device and the first cooling liquid inlet of the cooler;

[0012] The first end of the first four-way valve is connected with the outlet of the heat generating device, and the second end of the first four-way valve is connected with the first cooling liquid inlet of the cooler;

[0013] The third end of the first four-way valve is connected with the inlet of the motor water pump.

[0014] According to one embodiment of the present application, further comprising: a battery water pump, at least one group of power batteries and a second four-way valve;

[0015] The outlet of the battery water pump is connected with the heat exchange pipeline inlet inside the power battery, and the heat exchange pipeline outlet inside the power battery is connected with the first end of the second four-way valve;

[0016] The second four-way valve is arranged on a connecting pipeline between the second end of the first four-way valve and the first cooling liquid inlet of the cooler, the second end of the second four-way valve is connected with the second end of the first four-way valve, and the third end of the second four-way valve is connected with the first cooling liquid inlet of the cooler;

[0017] The third end of the second four-way valve is connected with the inlet of the battery water pump.

[0018] According to one embodiment of the present application, the first cooling liquid outlet of the cooler is connected with the inlet of the battery water pump.

[0019] According to one embodiment of the present application, further comprising: an expansion tank;

[0020] The expansion tank is connected with the inlet of the battery water pump.

[0021] According to one embodiment of the present application, further comprising:

[0022] A PTC heater is arranged on a connecting pipeline between the fourth end of the second four-way valve and the first cooling liquid inlet of the cooler, the inlet of the PTC heater is connected with the fourth end of the second four-way valve, and the outlet of the PTC heater is connected with the first cooling liquid inlet of the cooler.

[0023] According to one embodiment of the present application, further comprising a radiator;

[0024] The inlet of the radiator is connected with the outlet of the heat generating device, and the outlet of the radiator is connected with the fourth end of the first four-way valve.

[0025] According to one embodiment of the present application, the heat pump air conditioner further comprises:

[0026] The electric compressor, the indoor condenser, the three-way valve, the one-way valve, the outdoor heat exchanger, the indoor heat exchanger, the first electromagnetic valve and the gas-liquid separator;

[0027] The outlet of the electric compressor is connected with the inlet of the indoor condenser, and the outlet of the indoor condenser is connected with the first end of the three-way valve;

[0028] The second end of the three-way valve is connected with the output end of the one-way valve and the inlet of the outdoor heat exchanger, and the third end of the three-way valve is connected with the inlet of the indoor heat exchanger;

[0029] The first outlet of the indoor heat exchanger is connected with the input end of the one-way valve and the second cooling liquid inlet of the cooler;

[0030] The outlet of the outdoor heat exchanger is connected with the first end of the first electromagnetic valve, the second end of the first electromagnetic valve and the second cooling liquid outlet of the cooler are connected with the inlet of the gas-liquid separator, and the outlet of the gas-liquid separator is connected with the inlet of the electric compressor.

[0031] According to one embodiment of the present application, the heat pump air conditioner further comprises:

[0032] The second electromagnetic valve, the first electronic expansion valve, the third electromagnetic valve, the liquid reservoir, the supercooling section of the outdoor heat exchanger, the second electronic expansion valve, the third electronic expansion valve and the fourth electromagnetic valve;

[0033] The second electromagnetic valve is arranged on the connecting pipeline between the second end of the three-way valve and the outdoor heat exchanger, the first end of the second electromagnetic valve is connected with the second end of the three-way valve and the first end of the first electronic expansion valve, and the second end of the second electromagnetic valve is connected with the inlet of the outdoor heat exchanger and the second end of the first electronic expansion valve;

[0034] The first end of the third electromagnetic valve is connected with the outlet of the outdoor heat exchanger, the second end of the third electromagnetic valve is connected with the inlet of the liquid reservoir, and the outlet of the liquid reservoir is connected with the inlet of the supercooling section of the outdoor heat exchanger;

[0035] The second electronic expansion valve and the third electronic expansion valve are arranged on the connecting pipeline between the indoor heat exchanger and the cooler, the first end of the second electronic expansion valve is connected with the first outlet of the indoor heat exchanger, the second end of the second electronic expansion valve is connected with the outlet of the supercooling section of the outdoor heat exchanger and the first end of the third electronic expansion valve, and the second end of the third electronic expansion valve is connected with the second cooling liquid inlet of the cooler;

[0036] The fourth electromagnetic valve is arranged on a connecting pipeline between an outlet of the indoor heat exchanger and an inlet of the gas-liquid separator.

[0037] The electric vehicle according to the second aspect of the present application comprises the heat management circuit of the electric vehicle according to any one of the above embodiments.

[0038] The one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0039] By connecting the outlet of the motor water pump with the inlet of the heat generating device, connecting the outlet of the heat generating device with the first cooling liquid inlet of the cooler of the heat pump air conditioner, and connecting the first cooling liquid outlet of the cooler with the inlet of the motor water pump, when the heat pump air conditioner of the electric vehicle is heating, the waste heat of the heat generating device can be absorbed by the cooling liquid of the cooler in the heat pump air conditioner, and the cooling liquid absorbing the waste heat is exchanged by the cooler to provide heat energy for the heat pump air conditioner, so that the heat pump air conditioner uses the waste heat of the heat generating device to heat, thereby the waste heat generated by the heat generating device can be used as a low-temperature heat source when the heat pump air conditioner is heating, the energy consumption of the whole vehicle is reduced, the energy utilization rate is improved, and the cruising range of the electric vehicle is increased.

[0040] Further, the voltage on the capacitor of the three-phase inverter circuit is set to be greater than the voltage of each power battery, and at the same time, does not exceed the maximum voltage allowed by the three-phase inverter circuit to work, so that the current of the three-phase driving motor is in a controllable state.

[0041] Further, by connecting the outlet of the battery water pump with the inlet of the power battery, connecting the outlet of the power battery with the first end of the second four-way valve, and arranging the second four-way valve on the connecting pipeline between the second end of the first four-way valve and the first cooling liquid inlet of the cooler, when the heat pump air conditioner of the electric vehicle is heating, the waste heat of the heat generating device and the power battery can be absorbed by the cooling liquid of the cooler in the heat pump air conditioner, and the cooling liquid absorbing the waste heat is exchanged by the cooler to provide heat energy for the heat pump air conditioner, so that the heat pump air conditioner uses the waste heat of the heat generating device to heat, thereby the waste heat generated by the heat generating device and the power battery at the same time can be used as a low-temperature heat source when the heat pump air conditioner is heating, the heat of the heat source is improved, and further, the energy consumption of the whole vehicle is reduced, the energy utilization rate is improved, and the cruising range of the electric vehicle is increased.

[0042] Further, by connecting the inlet of the radiator with the outlet of the heat generating device, and connecting the outlet of the radiator with the fourth end of the first four-way valve, when the heat generating device needs to be cooled, the radiator and the motor water pump can be started, and the cooling liquid flows through the power supply device, the electric drive device, and the radiator in turn, so that the heat of the power supply device and the electric drive device is taken away by the cooling liquid to exchange heat with the air outside the vehicle through the radiator, and the cooling and temperature reduction purposes are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0044] Figure 1 is a structural schematic diagram of a thermal management circuit of an electric vehicle provided by an embodiment of the application;

[0045] Figure 2 is a structural schematic diagram of a thermal management circuit of an electric vehicle provided by another embodiment of the application;

[0046] Figure 3 is a structural schematic diagram of a thermal management circuit of an electric vehicle provided by another embodiment of the application;

[0047] Figure 4 is a structural schematic diagram of a thermal management circuit of an electric vehicle provided by another embodiment of the application;

[0048] Figure 5 is a structural schematic diagram of a thermal management circuit of an electric vehicle provided by another embodiment of the application;

[0049] Figure 6 is a structural schematic diagram of a thermal management circuit of an electric vehicle provided by another embodiment of the application. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the application clearer, the technical solutions in the application will be described clearly and completely in the following with reference to the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are some embodiments of the application, but not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the application.

[0051] In the following, the thermal management circuit of an electric vehicle provided by the embodiments of the application will be described and explained in detail through several specific embodiments.

[0052] In an embodiment, as shown in Figure 1 , a thermal management circuit of an electric vehicle is provided, comprising:

[0053] a motor water pump 1, a heat generating device 2 of the electric vehicle, and a heat pump air conditioner 3;

[0054] The outlet of the motor water pump 1 is connected to the inlet of the heat generating device 2, the outlet of the heat generating device 2 is connected to the first coolant inlet of the cooler 100 of the heat pump air conditioner 3, and the first coolant outlet of the cooler 100 is connected to the inlet of the motor water pump 1.

[0055] The heat-generating device 2 includes a power supply device 101 and an electric drive device 102.

[0056] In one embodiment, the power supply unit 101 may consist of a battery, a generator, and a voltage regulator, and the electric drive unit 102 may be a three-phase drive motor for an electric vehicle. The outlet of the motor water pump is connected to the inlet of the heat exchange pipeline inside the power supply unit 101, the outlet of the heat exchange pipeline inside the power supply unit 101 is connected to the inlet of the heat exchange pipeline inside the electric drive unit 102, and the outlet of the heat exchange pipeline inside the electric drive unit 102 is connected to the first coolant inlet of the cooler 100.

[0057] When an electric vehicle is in a low-temperature environment, if the electric vehicle's heat pump air conditioner is used for heating, the motor water pump 1 can be turned on. The coolant obtained from the first coolant outlet of the cooler 100 flows sequentially through the power supply unit 101 and the electric drive unit 102, absorbing the waste heat of the power supply unit 101 and the electric drive unit 102. Then, the liquid that has absorbed the waste heat flows into the first coolant inlet of the cooler 100 for heat exchange, thereby providing the heat pump air conditioner 3 with the waste heat of the power supply unit 101 and the electric drive unit 102. This allows the heat pump air conditioner 3 to use the waste heat of the power supply unit 101 and the electric drive unit 102 for heating, realizing a cycle of using waste heat for heating and improving energy efficiency.

[0058] By connecting the outlet of the motor water pump to the inlet of the heat-generating device, the outlet of the heat-generating device to the first coolant inlet of the cooler of the heat pump air conditioner, and the first coolant outlet of the cooler to the inlet of the motor water pump, when the heat pump air conditioner of the electric vehicle is heating, the waste heat of the heat-generating device can be absorbed by the coolant in the cooler of the heat pump air conditioner. The coolant that has absorbed the waste heat is then exchanged for heat through the cooler to provide heat energy for the heat pump air conditioner. This allows the heat pump air conditioner to use the waste heat of the heat-generating device for heating, thereby using the waste heat generated by the heat-generating device as a low-temperature heat source when the heat pump air conditioner is heating, reducing the energy consumption of the whole vehicle, improving energy efficiency, and increasing the driving range of the electric vehicle.

[0059] In one embodiment, such as Figure 2 As shown, it also includes:

[0060] First four-way valve 4;

[0061] The first four-way valve 4 is installed on the connecting pipeline between the outlet of the heat generating device 2 and the first coolant inlet of the cooler 100;

[0062] The first end of the first four-way valve 4 is connected to the outlet of the heat generating device 2, and the second end of the first four-way valve 4 is connected to the first coolant inlet of the cooler 100.

[0063] The third end of the first four-way valve 4 is connected to the inlet of the motor water pump 1.

[0064] When the electric vehicle is in a low-temperature environment, and the heat pump air conditioner 3 is heating, the motor water pump 1 is turned on, so that the coolant of the cooler 100 flows through the power supply device 101, the electric drive device 102, and the first four-way valve 4 in sequence before returning to the cooler 100, providing heat energy for the heat pump air conditioner.

[0065] When the heat pump air conditioner 3 is heating, some of the coolant will flow through the power supply unit 101, the electric drive unit 102, the first four-way valve 4 and then return to the motor water pump 1. Thus, in a low-temperature environment, when the total waste heat generated by the power supply unit 101, the electric drive unit 102 and the power battery 6 is less than the predetermined heat, the waste heat generated by the power supply unit 101 and the electric drive unit 102 can be used to keep the power supply unit 101 and the electric drive unit 102 warm and store heat.

[0066] To further increase the waste heat supplied to the heat pump air conditioner, thereby further reducing the energy consumption of the entire vehicle, in one embodiment, such as Figure 3 As shown, it also includes: a battery water pump 5, at least one set of power batteries 6, and a second four-way valve 7;

[0067] The outlet of the battery water pump 5 is connected to the inlet of the heat exchange pipeline inside the power battery 6, and the outlet of the heat exchange pipeline inside the power battery 6 is connected to the first end of the second four-way valve 7.

[0068] The second four-way valve 7 is disposed on the connecting pipe between the second end of the first four-way valve 4 and the first coolant inlet of the cooler 100. The second end of the second four-way valve 7 is connected to the second end of the first four-way valve 4, and the third end of the second four-way valve 7 is connected to the first coolant inlet of the cooler 100.

[0069] The third end of the second four-way valve is connected to the inlet of the battery water pump.

[0070] In one embodiment, when the electric vehicle is in a low-temperature environment, if the heat pump air conditioner 3 is used for heating, the motor water pump 1 and the battery water pump 5 can be turned on. The coolant of the cooler 100 flows sequentially through the motor water pump 1, the power supply device 101, the electric drive device 102, the first four-way valve 4, the second four-way valve 7, the battery water pump 5, and the power battery 6, thereby absorbing the waste heat of the power supply device 101, the electric drive device 102, and the power battery 6, and then returns to the cooler 100 through the second four-way valve 7 for heat exchange. This allows the heat pump air conditioner 3 to use the waste heat of the power supply device 101, the electric drive device 102, and the power battery 6 for heating, further improving the energy efficiency.

[0071] In one embodiment, the first coolant outlet of the cooler 100 can also be connected to the inlet of the battery water pump 5. In this case, when the electric vehicle is in a low-temperature environment, if the heat pump air conditioner 3 is in heating mode, the motor water pump 1 and the battery water pump 5 can be turned on. Part of the coolant in the cooler 100 will flow to the motor water pump 1, and the other part will flow to the battery water pump 5. The coolant flowing to the motor water pump 1 will pass through the power supply unit 101 and the electric drive unit 102, absorbing the waste heat from the power supply unit 101 and the electric drive unit 102. Then, it will flow through the first four-way valve 4 and the second four-way valve 7 before entering the battery water pump 5. Together with the other portion of coolant flowing through the battery water pump 5, it will flow through the power battery 6, absorbing the waste heat from the power battery 6, and then flow through the second four-way valve 7 to the first coolant inlet of the cooler 100.

[0072] In one embodiment, an expansion tank may also be provided at the inlet of the battery water pump.

[0073] By connecting the outlet of the battery water pump to the inlet of the power battery, connecting the outlet of the power battery to the first end of the second four-way valve, and setting the second four-way valve on the connection pipe between the second end of the first four-way valve and the first coolant inlet of the cooler, when the heat pump air conditioner of the electric vehicle is heating, the coolant in the cooler of the heat pump air conditioner can absorb the waste heat from the heat-generating device and the power battery, and the coolant that has absorbed the waste heat can be exchanged through the cooler to provide heat energy for the heat pump air conditioner. The heat pump air conditioner can use the waste heat of the heat-generating device for heating, thereby using the waste heat generated by the heat-generating device and the power battery at the same time as the low-temperature heat source when the heat pump air conditioner is heating, increasing the heat source heat, and further reducing the energy consumption of the whole vehicle, improving the energy efficiency, and increasing the driving range of the electric vehicle when the heat pump air conditioner is heating.

[0074] When the heat pump air conditioner 3 is in heating mode, some of the coolant flows sequentially through the power supply unit 101, the electric drive unit 102, and the first four-way valve 4 before returning to the motor water pump 1. Therefore, the waste heat generated by the power supply unit 101 and the electric drive unit 102 can be used to insulate and store heat for the power supply unit 101 and the electric drive unit 102, reducing the heat energy that the heat pump air conditioner needs to provide to the heat-generating device. At the same time, since some of the coolant flows sequentially through the battery water pump 5 and the power battery, it returns to the battery water pump 5 via the second four-way valve 7. Therefore, the waste heat generated by the power battery can also be used to insulate and store heat for the power battery, achieving the purpose of balancing the internal temperature of the power battery. Thus, in low-temperature environments, when the total waste heat generated by the power supply unit 101, the electric drive unit 102, and the power battery 6 is less than the predetermined heat, it can still insulate and store heat for the power supply unit 101, the electric drive unit 102, and the power battery 6, keeping the power battery, the power supply unit, and the electric drive unit at a suitable operating temperature and improving the service life of the three electrical components.

[0075] In one embodiment, such as Figure 4 As shown, it also includes:

[0076] PTC heater 8 is disposed on the connection pipeline between the fourth end of the second four-way valve 7 and the first coolant inlet of the cooler 100. The inlet of the PTC heater 8 is connected to the fourth end of the second four-way valve 7, and the outlet of the PTC heater 8 is connected to the first coolant inlet of the cooler 100.

[0077] In low-temperature environments, if the total waste heat generated by the power supply unit 101, electric drive unit 102, and power battery 6 is relatively large, the PTC heater 8 can be turned off when the heat pump air conditioner 3 is in heating mode, so as to utilize the waste heat of the power supply unit 101, electric drive unit 102, and power battery 6 to power the heat pump air conditioner 3. If the total waste heat generated by the power supply unit 101, electric drive unit 102, and power battery 6 is relatively small, i.e. less than the preset heat, the PTC heater 8 can be turned on when the heat pump air conditioner 3 is in heating mode. At this time, the coolant flowing through the PTC heater 8 through the second four-way valve 7 will be heated by the PTC heater 8 and returned to the cooler 100, so that the heat pump air conditioner 3 can use the coolant heated by the PTC heater 8 for heating.

[0078] Furthermore, when the heat pump air conditioner 3 is in heating mode, if the power battery 6 has a heating requirement in a low-temperature environment, the PTC heater 8 can be turned on, while the heat exchange function of the cooler 100 and the motor water pump 1 are turned off, and the battery water pump 5 is turned on. This allows the coolant heated by the PTC heater 8 to flow through the cooler 100 and the battery water pump 5 in sequence before entering the heat exchange pipeline inside the power battery 6, thus providing heating energy for the power battery 6.

[0079] In one embodiment, such as Figure 5As shown, it also includes:

[0080] Radiator 9;

[0081] The inlet of the radiator 9 is connected to the outlet of the heat generating device 2, and the outlet of the radiator 9 is connected to the fourth end of the first four-way valve 4.

[0082] like Figure 5 As shown, the inlet of the radiator 9 is connected to the outlet of the electric drive device 102 in the heat generation device 2.

[0083] In one embodiment, in a low-temperature environment, when the heat pump air conditioner 3 is heating, the radiator 9 can be shut off to prevent it from affecting the residual heat generated by the power supply unit 101, the electric drive unit 102, and the power battery. In high-temperature or normal-temperature environments, the power supply unit 101, the electric drive unit 102, and the power battery 6 can share the radiator 9 for cooling. That is, at this time, the battery water pump 1 and the motor water pump 5 are working, and the coolant flows sequentially through the power supply unit 101, the electric drive unit 102, the radiator 9 (heat exchange), the first four-way valve 4, the second four-way valve 7, the battery water pump 5, the power battery 6, the second four-way valve 7, the PTC heater 22 (not working), the cooler 16 (no heat exchange), and the motor water pump 5 to form a heat dissipation cycle.

[0084] Alternatively, if the power supply unit 101 and electric drive unit 102 require cooling, while the power battery 6 requires temperature equalization, the motor water pump 1 can be activated. In this case, the coolant flows sequentially through the power supply unit 101, electric drive unit 102, radiator 9 (heat exchange), and the first four-way valve 4 back to the motor water pump 1. The heat from the power supply unit 101 and electric drive unit 102 is carried by the coolant to the radiator 9 for heat exchange with the outside air, achieving cooling. Simultaneously, the battery water pump 5 operates, and the second and fourth ends of the second four-way valve 7 are closed, allowing the coolant to flow sequentially through the power battery 6 and back to the battery water pump 5 via the second four-way valve 7, thus achieving temperature equalization within the power battery 6.

[0085] By connecting the radiator inlet to the outlet of the heat-generating device and the radiator outlet to the fourth end of the first four-way valve, the radiator and motor water pump can be turned on when the heat-generating device needs cooling. This allows the coolant to flow sequentially through the power supply unit, electric drive unit, and radiator, thereby transferring the heat from the power supply unit and electric drive unit to the radiator for heat exchange with the outside air, achieving the purpose of cooling.

[0086] In one embodiment, such as Figure 6 As shown, the heat pump air conditioner 3 also includes:

[0087] Electric compressor 10, indoor condenser 11, three-way valve 12, one-way valve 13, outdoor heat exchanger 14, indoor heat exchanger 15, first solenoid valve 16, and gas-liquid separator 17.

[0088] The outlet of the electric compressor 10 is connected to the inlet of the indoor condenser 11, and the outlet of the indoor condenser 11 is connected to the first end of the three-way valve 12.

[0089] The second end of the three-way valve 12 and the output end of the one-way valve 13 are connected to the inlet of the outdoor heat exchanger 14, and the third end of the three-way valve 13 is connected to the inlet of the indoor heat exchanger 15.

[0090] The first outlet of the indoor heat exchanger 15 is connected to the input end of the one-way valve 13 and the second coolant inlet of the cooler 100.

[0091] The outlet of the outdoor heat exchanger 14 is connected to the first end of the first solenoid valve 16, the second end of the first solenoid valve 16 and the second coolant outlet of the cooler 100 are connected to the inlet of the gas-liquid separator 17, and the outlet of the gas-liquid separator 17 is connected to the inlet of the electric compressor 10.

[0092] In one embodiment, when the heat pump air conditioner 3 is heating, if the waste heat generated by the heat generating device 2 or the heat generating device 2 and the power battery is sufficient, the electric compressor 10 can be started, and the second end of the three-way valve 12, the first solenoid valve 16 and the one-way valve 13 can be closed. At this time, the refrigerant flows through the indoor condenser 11 for heat exchange, and then flows through the three-way valve 12 in sequence through the indoor heat exchanger 15 and the cooler 100 for heat exchange. Finally, it returns to the electric compressor 10 through the gas-liquid separator 17, forming a waste heat heating cycle.

[0093] When the heat pump air conditioner 3 is heating, if the waste heat is insufficient, the electric compressor 10 can be started, and the second end of the three-way valve 12 can be closed. At this time, the refrigerant will be split into two paths. The first path is that part of the refrigerant flows through the indoor condenser 11 for heat exchange, and then flows through the three-way valve 12 in sequence through the indoor heat exchanger 15 and the cooler 100 for heat exchange, and finally returns to the electric compressor 10 through the gas-liquid separator 17, forming a waste heat heating cycle. The second path is that another part of the refrigerant flows through the indoor condenser 11 for heat exchange, and then flows through the three-way valve 12 through the indoor heat exchanger 15 for heat exchange, and then flows through the one-way valve 13 through the outdoor heat exchanger 15 for heat exchange, and then flows through the first solenoid valve 16 through the gas-liquid separator 17 to return to the electric compressor 10, so as to absorb ambient heat through the outdoor heat exchanger and form a heating cycle.

[0094] Alternatively, if the residual heat is insufficient, the electric compressor 10 can be started while the third end of the three-way valve 12 is closed. At this time, the refrigerant flows through the indoor condenser 11 for heat exchange, then through the outdoor heat exchanger 14 for heat exchange, and then through the first solenoid valve 16 through the gas-liquid separator 17 back to the electric compressor 10 to absorb ambient heat through the outdoor heat exchanger, forming a heating cycle.

[0095] In one embodiment, such as Figure 6 As shown, the heat pump air conditioner 3 also includes:

[0096] The system includes a second solenoid valve 18, a first electronic expansion valve 19, a third solenoid valve 20, a liquid receiver 21, an outdoor heat exchanger subcooling section 22, a second electronic expansion valve 23, a third electronic expansion valve 24, and a fourth solenoid valve 25.

[0097] The second solenoid valve 18 is disposed on the connecting pipe between the second end of the three-way valve 12 and the outdoor heat exchanger 14. The first end of the second solenoid valve 18 is connected to the second end of the three-way valve 12 and the first end of the first electronic expansion valve 19. The second end of the second solenoid valve 18 is connected to the inlet of the outdoor heat exchanger 14 and the second end of the first electronic expansion valve 18.

[0098] The first end of the third solenoid valve 20 is connected to the outlet of the outdoor heat exchanger 14, the second end of the third solenoid valve 20 is connected to the inlet of the liquid reservoir 21, and the outlet of the liquid reservoir 21 is connected to the inlet of the subcooling section 22 of the outdoor heat exchanger.

[0099] The second electronic expansion valve 23 and the third electronic expansion valve 24 are disposed on the connecting pipe between the indoor heat exchanger 15 and the cooler 100. The first end of the second electronic expansion valve 23 is connected to the first outlet of the indoor heat exchanger 15, and the second end of the second electronic expansion valve 23 is connected to the first end of the third electronic expansion valve 24 through the outlet of the subcooling section 22 of the outdoor heat exchanger. The second end of the third electronic expansion valve 24 is connected to the second coolant inlet of the cooler 100.

[0100] The fourth solenoid valve 25 is located on the connecting pipeline between the outlet of the indoor heat exchanger 15 and the inlet of the gas-liquid separator 17.

[0101] In one embodiment, when the heat pump air conditioner 3 is heating, if the waste heat generated by the heat generating device 2 or the heat generating device 2 and the power battery is sufficient, the electric compressor 10 can be started, and the second end of the three-way valve 12, the first solenoid valve 16, the one-way valve 13 and the fourth solenoid valve 25 can be closed. At this time, the refrigerant flows through the indoor condenser 11 for heat exchange, and then flows through the three-way valve 12 in sequence through the indoor heat exchanger 15 and the cooler 100 for heat exchange. Finally, it returns to the electric compressor 10 through the gas-liquid separator 17, forming a waste heat heating cycle.

[0102] When the heat pump air conditioner 3 is heating, if the waste heat is insufficient, the electric compressor 10 can be started, and the second end of the three-way valve 12, the second solenoid valve 18, the third solenoid valve 20, and the fourth solenoid valve 25 can be closed. At this time, the refrigerant will be split into two paths. The first path is that part of the refrigerant flows through the indoor condenser 11 for heat exchange, and then through the three-way valve 12 to flow through the indoor heat exchanger 15 and the cooler 100 for heat exchange, and finally returns to the electric compressor 10 through the gas-liquid separator 17, forming a waste heat heating cycle. The second path is that another part of the refrigerant flows through the indoor condenser 11 for heat exchange, and then through the three-way valve 12 to flow through the indoor heat exchanger 15 for heat exchange, and then through the one-way valve 13 to flow through the outdoor heat exchanger 15 for heat exchange, and then through the first solenoid valve 16 to flow through the gas-liquid separator 17 and return to the electric compressor 10, so as to absorb ambient heat through the outdoor heat exchanger and form a heating cycle.

[0103] Alternatively, if the residual heat is insufficient, the electric compressor 10 can be started, while the third end of the three-way valve 12, the second solenoid valve 18, the third solenoid valve 20, and the fourth solenoid valve 25 are closed. At this time, the refrigerant flows through the indoor condenser 11 for heat exchange, then flows through the outdoor heat exchanger 14 for heat exchange, and then flows through the first solenoid valve 16 through the gas-liquid separator 17 back to the electric compressor 10 to absorb ambient heat through the outdoor heat exchanger, forming a heating cycle.

[0104] When the heat pump air conditioner 3 is cooling, the electric compressor 10 can be started, and the first electronic expansion valve 19 and the first solenoid valve 16 can be closed at the same time. At this time, the refrigerant will be split into two paths. The first path is that the refrigerant flows through the indoor condenser 11 (which does not exchange heat), the three-way valve 12, the second solenoid valve 18, the outdoor heat exchanger 14, the third solenoid valve 20, the liquid receiver 21, and the subcooling section 22 of the outdoor heat exchanger. Then it passes through the cooler 100 for heat exchange and finally returns to the electric compressor 10 through the gas-liquid separator 17 so that the power battery 6 can be cooled down through the cooler 100. The second path involves the refrigerant flowing through the indoor condenser 11 (which does not exchange heat), the three-way valve 12, the second solenoid valve 18, the outdoor heat exchanger 14, the third solenoid valve 20, the liquid receiver 21, and the subcooling section 22 of the outdoor heat exchanger. After heat exchange through the indoor heat exchanger 15, the refrigerant finally returns to the electric compressor 10 through the gas-liquid separator 17. This allows the refrigerant to cool the passenger compartment through the indoor heat exchanger, forming another heat exchange cycle.

[0105] Alternatively, when only the indoor heat exchanger is needed to cool the crew compartment, the second electronic expansion valve 23 can be closed while the first electronic expansion valve 19 and the first solenoid valve 16 are closed, so that the crew compartment can be cooled only by the indoor heat exchanger.

[0106] Alternatively, when only the power battery 6 requires cooling, the fourth solenoid valve 25 can be closed while the first electronic expansion valve 19 and the first solenoid valve 16 are closed, so that the heat of the power battery can be carried away by the cooler to achieve the purpose of cooling.

[0107] In one embodiment, an electric vehicle is also provided, including a thermal management circuit for an electric vehicle as described in any of the above embodiments.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A thermal management circuit for an electric vehicle, characterized in that, include: Electric motors and water pumps, heat generation devices for electric vehicles, and heat pump air conditioners; The outlet of the motor water pump is connected to the inlet of the heat generating device, the outlet of the heat generating device is connected to the first coolant inlet of the cooler of the heat pump air conditioner, and the first coolant outlet of the cooler is connected to the inlet of the motor water pump. The heat-generating device includes a power supply device and an electric drive device; The thermal management circuit also includes a first four-way valve, a battery water pump, at least one set of power batteries, a second four-way valve, and a radiator. The first four-way valve is installed on the connecting pipe between the outlet of the heat generating device and the first coolant inlet of the cooler; The first end of the first four-way valve is connected to the outlet of the heat generating device, and the second end of the first four-way valve is connected to the first coolant inlet of the cooler. The third end of the first four-way valve is connected to the inlet of the motor-driven water pump; The outlet of the battery water pump is connected to the inlet of the heat exchange pipeline inside the power battery, and the outlet of the heat exchange pipeline inside the power battery is connected to the first end of the second four-way valve. The second four-way valve is installed on the connecting pipe between the second end of the first four-way valve and the first coolant inlet of the cooler. The second end of the second four-way valve is connected to the second end of the first four-way valve, and the fourth end of the second four-way valve is connected to the first coolant inlet of the cooler. The third end of the second four-way valve is connected to the inlet of the battery water pump, the first coolant outlet of the cooler is connected to the inlet of the battery water pump, the inlet of the radiator is connected to the outlet of the heat generating device, and the outlet of the radiator is connected to the fourth end of the first four-way valve. If the power supply device and the electric drive device have cooling requirements, and the power battery has temperature equalization requirements, the motor water pump is turned on, so that a portion of the coolant flows sequentially through the power supply device, the electric drive device, the radiator, and the first four-way valve back to the motor water pump. At the same time, the battery water pump is turned on, and the second and fourth ends of the second four-way valve are closed, so that another portion of the coolant flows sequentially through the power battery and the second four-way valve back to the battery water pump.

2. The thermal management circuit for an electric vehicle according to claim 1, characterized in that, Also includes: Expansion box; The expansion tank is connected to the inlet of the battery water pump.

3. The thermal management circuit for an electric vehicle according to claim 1, characterized in that, Also includes: The PTC heater is installed on the connection pipe between the fourth end of the second four-way valve and the first coolant inlet of the cooler. The inlet of the PTC heater is connected to the fourth end of the second four-way valve, and the outlet of the PTC heater is connected to the first coolant inlet of the cooler.

4. The thermal management circuit for an electric vehicle according to any one of claims 1-3, characterized in that, The heat pump air conditioner also includes: Electric compressor, indoor condenser, three-way valve, one-way valve, outdoor heat exchanger, indoor heat exchanger, first solenoid valve, and gas-liquid separator; The outlet of the electric compressor is connected to the inlet of the indoor condenser, and the outlet of the indoor condenser is connected to the first end of the three-way valve; The second end of the three-way valve is connected to the output end of the one-way valve and then to the inlet of the outdoor heat exchanger; the third end of the three-way valve is connected to the inlet of the indoor heat exchanger. The first outlet of the indoor heat exchanger is connected to the input end of the one-way valve and the second coolant inlet of the cooler. The outlet of the outdoor heat exchanger is connected to the first end of the first solenoid valve, the second end of the first solenoid valve and the second coolant outlet of the cooler are connected to the inlet of the gas-liquid separator, and the outlet of the gas-liquid separator is connected to the inlet of the electric compressor.

5. The thermal management circuit for an electric vehicle according to claim 4, characterized in that, The heat pump air conditioner also includes: The system includes a second solenoid valve, a first electronic expansion valve, a third solenoid valve, a liquid receiver, an outdoor heat exchanger subcooling section, a second electronic expansion valve, a third electronic expansion valve, and a fourth solenoid valve. The second solenoid valve is installed on the connecting pipe between the second end of the three-way valve and the outdoor heat exchanger. The first end of the second solenoid valve is connected to the second end of the three-way valve and the first end of the first electronic expansion valve. The second end of the second solenoid valve is connected to the inlet of the outdoor heat exchanger and the second end of the first electronic expansion valve. The first end of the third solenoid valve is connected to the outlet of the outdoor heat exchanger, the second end of the third solenoid valve is connected to the inlet of the liquid storage tank, and the outlet of the liquid storage tank is connected to the inlet of the subcooling section of the outdoor heat exchanger. The second electronic expansion valve and the third electronic expansion valve are installed on the connecting pipe between the indoor heat exchanger and the cooler. The first end of the second electronic expansion valve is connected to the first outlet of the indoor heat exchanger, the second end of the second electronic expansion valve is connected to the first end of the third electronic expansion valve through the outlet of the subcooling section of the outdoor heat exchanger, and the second end of the third electronic expansion valve is connected to the second coolant inlet of the cooler. The fourth solenoid valve is located on the connecting pipe between the outlet of the indoor heat exchanger and the inlet of the gas-liquid separator.

6. An electric vehicle, characterized in that, Includes the thermal management circuit for an electric vehicle according to any one of claims 1-5.

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