An integrated thermal management system and method of controlling the same

Abstract

The application discloses an integrated heat management system and a control method thereof. The system comprises a heat pump circuit, a heating circuit, a battery circuit and an electrically-driven cooling circuit. The heat pump circuit can exchange heat with the heating circuit through a second heat exchanger, provide heat to the heating circuit, exchange heat with the electrically-driven cooling circuit through a third heat exchanger, obtain heat from the electrically-driven cooling circuit, exchange heat with the battery circuit through a fourth heat exchanger, and provide cold to a passenger cabin through the evaporator. The heating circuit can provide heat to the passenger cabin through a warm air core. The battery circuit can communicate with the electrically-driven cooling circuit and exchange heat with the heating circuit through the first heat exchanger, and is used for adjusting the temperature of a power battery. The electrically-driven cooling circuit is used for heat dissipation of an electrically-driven system, and can provide heat to the heat pump system through the third heat exchanger.

Description

Technical Field

[0001] This invention relates to the field of thermal management technology, and more specifically to an integrated thermal management system and its control method. Background Technology

[0002] With the rapid development of new energy vehicle technology, thermal management systems are gradually moving towards integration and high efficiency. However, in winter, battery performance is severely limited by low temperatures, and the heat pump system's refrigerant circuit also suffers from low efficiency in transferring heat. How to ensure the more efficient operation of the vehicle's thermal management system in low or even extremely low temperatures is crucial to determining the winter driving range of pure electric vehicles. Summary of the Invention

[0003] The problem this invention aims to solve is to overcome the shortcomings of existing technologies and provide an integrated thermal management system and its control method, which can recover heat from the electric drive system to the power battery and heat pump, reduce the impact of low temperature on the power battery and heat pump circuit, and improve the driving range of pure electric vehicles in winter.

[0004] To address the aforementioned technical problems, this invention provides an integrated thermal management system, comprising a heat pump circuit, a heating circuit, a battery circuit, and an electric drive cooling circuit. The heat pump circuit can exchange heat with the heating circuit via a second heat exchanger, providing heat to the heating circuit; it can exchange heat with the electric drive cooling circuit via a third heat exchanger, obtaining heat from the electric drive cooling circuit; it can exchange heat with the battery circuit via a fourth heat exchanger; and it can also provide cooling to the passenger compartment via an evaporator. The heating circuit provides heat to the passenger compartment via a heater core. The battery circuit is connected to the electric drive cooling circuit and can exchange heat with the heating circuit via a first heat exchanger for regulating the temperature of the power battery. The electric drive cooling circuit dissipates heat from the electric drive system and can also provide heat to the heat pump system via a third heat exchanger.

[0005] As an improvement to the integrated thermal management system of the present invention, the heat pump circuit includes a compressor, a condenser, and an evaporator; the outlet of the compressor is connected to port d of the second heat exchanger; port c of the second heat exchanger is connected to the condenser, and a first expansion valve is provided on the connecting pipe; port c of the second heat exchanger is also connected to port b of the third heat exchanger, and a first solenoid valve is provided on the connecting pipe; the condenser is connected to port a of the third heat exchanger and the evaporator, and a second expansion valve is provided on the connecting pipe between the condenser and the evaporator; port b of the third heat exchanger is connected to port d of the fourth heat exchanger, and a third expansion valve is provided on the connecting pipe; port a of the fourth heat exchanger and the evaporator are both connected to the inlet of the compressor; the inlet of the compressor is connected to port a of the third heat exchanger, and a second solenoid valve is provided on the connecting pipe.

[0006] As another improvement to the integrated thermal management system of the present invention, the heating circuit can obtain heat from the heat pump circuit through the second heat exchanger, obtain heat through the electric heating element and / or obtain heat from the electric drive cooling circuit through the first heat exchanger, and transfer the heat to the warm air core to achieve heating of the occupant cabin.

[0007] Furthermore, the heating circuit includes a first circulating pump, the electric heating element, a three-way valve, and the warm air core; the outlet of the first circulating pump is connected to port a of the second heat exchanger; port b of the second heat exchanger is connected to the warm air core, and the refrigerant between port b of the second heat exchanger and the warm air core flows through the electric heating element, enabling heat exchange with the electric heating element; the warm air core is connected to port a of the three-way valve; port c of the three-way valve is connected to port c of the first heat exchanger, and port b of the three-way valve is connected to port a of the first heat exchanger; port a of the first heat exchanger is connected to the inlet of the first circulating pump.

[0008] As another improvement to the integrated thermal management system of the present invention, the battery circuit can be connected to the electrically driven cooling circuit via a six-way valve. Using a six-way valve to replace the connection method of multiple sub-components in the water circuit can effectively improve the system's integration and reduce overall cost.

[0009] Furthermore, the battery circuit can obtain heat from the heating circuit and / or from the electric drive cooling circuit through the first heat exchanger, and transfer the heat to the power battery; the battery circuit can also obtain cooling energy from the heat pump circuit through the fourth heat exchanger, and transfer the cooling energy to the power battery, thereby achieving temperature regulation of the power battery.

[0010] Furthermore, the battery circuit includes a third circulation pump; the outlet of the third circulation pump is connected to port b of the first heat exchanger, and the refrigerant between the outlet of the third circulation pump and port b of the first heat exchanger flows through the power battery, enabling heat exchange with the power battery; port d of the first heat exchanger is connected to port b of the fourth heat exchanger; port d of the fourth heat exchanger is connected to port a of the six-way valve; port b of the six-way valve is connected to port b of the first heat exchanger; and port c of the six-way valve is connected to the inlet of the third circulation pump.

[0011] Furthermore, the electrically driven cooling system includes a second circulating pump and a radiator; the outlet of the second circulating pump is connected to port c of the third heat exchanger, and the refrigerant between the outlet of the second circulating pump and port c of the third heat exchanger flows through the electrically driven system, enabling heat exchange with the electrically driven system; port d of the third heat exchanger is connected to port c of the six-way valve; port e of the six-way valve is connected to the inlet of the second circulating pump; port d of the six-way valve is connected to the radiator; and the radiator is connected to the inlet of the second circulating pump.

[0012] As another improvement to the integrated thermal management system of the present invention, the system also includes a blower, wherein the airflow generated by the blower flows into the passenger compartment after passing through the evaporator or the heating core.

[0013] To address the aforementioned technical problems, another aspect of the present invention provides a control method for the aforementioned integrated thermal management system, comprising:

[0014] When the heat from the electric drive system is needed to heat the crew compartment, the control system causes the following to occur: the first solenoid valve to open, the second solenoid valve to close, the first expansion valve to close, the second expansion valve to close, the third expansion valve to open, the f and b ports of the six-way valve to connect and the a and e ports to connect while all other ports are closed, the a and b ports of the three-way valve to connect and the a and c ports to disconnect; the first circulation pump to operate, the compressor to operate, the blower to operate, the second circulation pump to operate, and the third circulation pump to stop operating; the fan to stop operating.

[0015] Furthermore, when it is necessary to use the heat from the electric drive system to heat the crew compartment, another control method is to control the following: the first solenoid valve is closed, the second solenoid valve is closed, the first expansion valve is partially open, the second expansion valve is closed, the third expansion valve is fully open, the f port and b port of the six-way valve are connected and the a port and e port are connected while all other ports are closed, the a port and b port of the three-way valve are connected while the a port and c port are disconnected; the first circulation pump is working, the compressor is working, the blower is working, the second circulation pump is working, the third circulation pump is not working; and the fan is working.

[0016] Furthermore, when it is necessary to use the heat from the electric drive system to heat the power battery, the control causes the following to occur: the first solenoid valve to close, the second solenoid valve to close, the first expansion valve to close, the second expansion valve to close, the third expansion valve to close, the f port and c port of the six-way valve to connect and the b port and e port to connect, and all other ports to close, and the three-way valve to close; the first circulating pump to stop working, the electric heating element to stop working, the compressor to stop working, the blower to stop working, the second circulating pump to work, the third circulating pump to work, and the fan to stop working.

[0017] In summary, the integrated thermal management system and its control method described above can meet the vehicle heat distribution modes under different driving conditions, including passenger compartment temperature control, power battery heat control, and electric drive system heat recovery. To address the problem of low heat exchanger heat absorption efficiency caused by low ambient temperature in heat pump mode, the heat from the electric drive cooling circuit can be used as a heat source to provide sufficient heat transfer for the system. Attached Figure Description

[0018] In the attached diagram:

[0019] Figure 1 This is a schematic diagram of the integrated thermal management system of the present invention.

[0020] Figure 2 This is a schematic diagram of the first type of refrigerant flow in the control method of the present invention.

[0021] Figure 3 This is a schematic diagram of the second type of refrigerant flow in the control method of the present invention.

[0022] Figure 4 This is a schematic diagram of the third type of media flow in the control method of the present invention.

[0023] Figure 5 This is a schematic diagram of the fourth type of refrigerant flow in the control method of the present invention.

[0024] Figure 6 This is a schematic diagram of the fifth type of refrigerant flow in the control method of the present invention.

[0025] Figure 7 This is a schematic diagram of the sixth type of refrigerant flow in the control method of the present invention.

[0026] In the diagram, 1. First circulating pump; 2. Second heat exchanger; 3. Electric heating element; 4. Three-way valve; 5. First heat exchanger; 6. First solenoid valve; 7. First expansion valve; 8. Compressor; 9. Blower; 10. Heater core; 11. Fourth heat exchanger; 12. Fan; 13. Radiator; 14. Condenser; 15. Second solenoid valve; 16. Second expansion valve; 17. Evaporator; 18. Third heat exchanger; 19. Third expansion valve; 20. Second circulating pump; 21. Electric drive system; 22. Six-way valve; 23. Third circulating pump; 24. Power battery. Detailed Implementation

[0027] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions of the embodiments are for the purpose of helping to understand the present invention, but do not constitute a limitation thereof.

[0028] Example 1

[0029] Figure 1 An integrated thermal management system according to the present invention is shown. For example... Figure 1 As shown, the integrated thermal management system includes a heat pump circuit, a heating circuit, a battery circuit, and an electric drive cooling circuit. The heat pump circuit exchanges heat with the heating circuit via a second heat exchanger 2, primarily providing heat to the heating circuit; it exchanges heat with the electric drive cooling circuit via a third heat exchanger 18, primarily obtaining heat from the electric drive cooling circuit; it exchanges heat with the battery circuit via a fourth heat exchanger 11, primarily providing cooling to the battery circuit; and it also provides cooling to the passenger compartment via an evaporator 17. The heating circuit provides heat to the passenger compartment via a heater core 10. The battery circuit is connected to the electric drive cooling circuit and exchanges heat with the heating circuit via a first heat exchanger 5, primarily obtaining heat from the heating circuit for regulating the temperature of the power battery 24; additionally, the heat pump circuit and the heating circuit can also indirectly obtain heat from the electric drive cooling circuit from the battery circuit. The electric drive cooling circuit is used to dissipate heat from the electric drive system 21.

[0030] The heat pump circuit includes a compressor 8, a condenser 14, and an evaporator 17. The outlet of the compressor 8 is connected to port d of the second heat exchanger 2. Port c of the second heat exchanger 2 is connected to the condenser 14, and a first expansion valve 7 is installed on the connecting pipe. Port c of the second heat exchanger 2 is also connected to port b of the third heat exchanger 18, and a first solenoid valve 6 is installed on the connecting pipe. The condenser 14 is connected to port a of the third heat exchanger 18 and the evaporator 17, and a second expansion valve 16 is installed on the connecting pipe between the condenser 14 and the evaporator 17. Port b of the third heat exchanger 18 is connected to port d of the fourth heat exchanger 11, and a third expansion valve 19 is installed on the connecting pipe. Port a of the fourth heat exchanger 11 and the evaporator 17 are both connected to the inlet of the compressor 8. The inlet of the compressor 8 is connected to port a of the third heat exchanger 18, and a second solenoid valve 15 is installed on the connecting pipe.

[0031] The heating circuit can obtain heat from the heat pump circuit through the second heat exchanger 2, obtain heat through the electric heating element 3 and / or obtain heat from the electric drive cooling circuit through the first heat exchanger 5, and transfer the heat to the warm air core 10, so as to achieve heating of the passenger compartment in conjunction with the blower 9.

[0032] The heating circuit includes a first circulating pump 1, an electric heating element 3, a three-way valve 4, and a warm air core 10; the outlet of the first circulating pump 1 is connected to port a of the second heat exchanger 2; port b of the second heat exchanger 2 is connected to the warm air core 10, and the refrigerant between port b of the second heat exchanger 2 and the warm air core 10 flows through the electric heating element 3, enabling heat exchange with the electric heating element 3; the warm air core 10 is connected to port a of the three-way valve 4; port c of the three-way valve 4 is connected to port c of the first heat exchanger 5, and port b of the three-way valve 4 is connected to port a of the first heat exchanger 5; port a of the first heat exchanger 5 is connected to the inlet of the first circulating pump 1.

[0033] The electric heating element 3 can use a PTC (Positive Temperature Coefficient) heating wire to quickly convert electricity into heat.

[0034] The battery circuit can be connected to the electric drive cooling circuit via a six-way valve 22.

[0035] The battery circuit can obtain heat from the heating circuit and / or the electric drive cooling circuit through the first heat exchanger 5 and transfer the heat to the power battery 24; the battery circuit can also obtain cooling energy from the heat pump circuit through the fourth heat exchanger 11 and transfer the cooling energy to the power battery 24, thereby achieving temperature regulation of the power battery 24.

[0036] The battery circuit includes a third circulation pump 23; the outlet of the third circulation pump 23 is connected to port b of the first heat exchanger 5, and the refrigerant between the outlet of the third circulation pump 23 and port b of the first heat exchanger 5 flows through the power battery 24, enabling heat exchange with the power battery 24; port d of the first heat exchanger 5 is connected to port b of the fourth heat exchanger 11; port d of the fourth heat exchanger 11 is connected to port a of the six-way valve 22; port b of the six-way valve 22 is connected to port b of the first heat exchanger 5; and port c of the six-way valve 22 is connected to the inlet of the third circulation pump 23.

[0037] The electrically driven cooling system includes a second circulating pump 20 and a radiator 13; the outlet of the second circulating pump 20 is connected to port c of the third heat exchanger 18, and the refrigerant between the outlet of the second circulating pump 20 and port c of the third heat exchanger 18 flows through the electrically driven system 21, enabling heat exchange with the electrically driven system 21; port d of the third heat exchanger 18 is connected to port c of the six-way valve 22; port e of the six-way valve 22 is connected to the inlet of the second circulating pump 20; port d of the six-way valve 22 is connected to the radiator 13; and the radiator 13 is connected to the inlet of the second circulating pump 20.

[0038] The system also includes a blower 9, which generates airflow that flows into the passenger compartment after passing through the evaporator 17 or the heater core 10. Optionally, the system also includes a fan 12, which can blow air onto the condenser 14 and the radiator 13 to improve heat dissipation efficiency.

[0039] In addition, ports a and c of the first heat exchanger 5 are connected, as are ports b and d; ports a and b of the second heat exchanger 2 are connected, as are ports c and d; ports a and b of the third heat exchanger 18 are connected, as are ports c and d; and ports a and c of the fourth heat exchanger 11 are connected, as are ports b and d. The battery circuit and the electric drive cooling circuit use the same refrigerant, which can be water. The heating circuit can also use water as the refrigerant. A temperature sensor is installed at the power battery 24 to monitor the temperature.

[0040] Example 2

[0041] This invention provides a control method for the aforementioned integrated thermal management system. By controlling the operating states of various components, such as expansion valves and solenoid valves, the entire system can be placed in different operating modes. It should be noted that in the following description, all valves are in a closed state by default; for example, all ports of the three-way valve 4 and the six-way valve 22 are closed. Components such as the compressor 8, circulating pump, and blower 9 are in a non-operating state by default. The expansion valve has three states: closed, fully open, and regulating (or partially open). The electric drive system 21 of this invention mainly includes a motor and electronic control, excluding the power battery 24. All four heat exchangers are plate heat exchangers, with one side being the water side and the other the refrigerant side. Furthermore, the description of the control modes below does not constitute a limitation on the control method of this invention. Other modes based on this invention obtained by those skilled in the art without inventive effort should fall within the protection scope of this invention.

[0042] First, the heating modes are introduced, specifically including five modes: a) the mode in which the heat from the electric drive system 21 is recovered to the power battery 24; b) the mode in which the heat from the electric drive system 21 is recovered to the passenger compartment; c) the mode in which the heat pump system heats the power battery 24; d) the mode in which the heat pump system heats both the passenger compartment and the power battery 24 simultaneously; and e) the mode in which the heat pump system heats the passenger compartment. The specific working process is described as follows.

[0043] a. Heat recovery from the electric drive system 21 to the power battery 24 mode

[0044] When it is necessary to use the heat from the electric drive system 21 to heat the power battery 24, such as Figure 2 As shown, the control causes: the first solenoid valve 6 to close, the second solenoid valve 15 to close, the first expansion valve 7 to close, the second expansion valve 16 to close, the third expansion valve 19 to close, the f port and c port of the six-way valve 22 to be connected and the b port and e port to be connected (all other ports are closed), and the three-way valve 4 to close; the first circulating pump 1 to be inactive, the electric heating element 3 to be inactive, the compressor 8 to be inactive, the blower 9 to be inactive, the second circulating pump 20 to be active, the third circulating pump 23 to be active, and the fan 12 to be inactive.

[0045] The heat pump circuit is not working.

[0046] The battery circuit and the electric drive cooling circuit are connected. The refrigerant circulation path is as follows: third circulation pump 23 - power battery 24 (usually flowing through the battery liquid cooling plate) - port b of six-way valve 22 - port e of six-way valve 22 - second circulation pump 20 - port c of third heat exchanger 18 - port d of third heat exchanger 18 - electric drive system 21 - port f of six-way valve 22 - port c of six-way valve 22 - third circulation pump 23. The refrigerant comes out from the third circulation pump 23, flows through the power battery 24 for heat exchange, and heats the power battery 24. It then flows through ports b and e of six-way valve 22 to the inlet of the second circulation pump 20, and then through the second circulation pump 20, ports c and d of the third heat exchanger 18, and through the electric drive system 21 to remove heat. Finally, it flows back to the third circulation pump 23 through ports f and c of six-way valve 22, circulating to recover waste heat from the electric drive system 21 and heat the power battery 24.

[0047] The application scenario is as follows: When the water temperature in the electric drive cooling circuit is limited, but waste heat recovery is available, the heat from the circuit can be transferred to the battery circuit through the six-way valve 22, causing the temperature of the power battery 24 to rise. At this time, the motor circuit and the electric drive cooling circuit are connected to form a small loop, and the heat will not flow out through the radiator 13.

[0048] b. Electric drive system 21 heat recovery to passenger cabin mode

[0049] When it is necessary to use the heat from the electric drive system 21 to heat the crew cabin, the heat recovery mode of the electric drive system 21 to the crew cabin is further divided into the following four modes:

[0050] ① The heat pump circuit obtains heat only from the electrically driven cooling circuit, and the heat from the electrically driven cooling circuit is dissipated only through the heat pump circuit.

[0051] Specifically, such as Figure 3 As shown, the heat pump circuit obtains heat from the electric drive cooling circuit only through the fourth heat exchanger 11, and the heat from the electric drive system 21 is dissipated only through the fourth heat exchanger 11. The control causes: the first solenoid valve 6 to open, the second solenoid valve 15 to close, the first expansion valve 7 to close, the second expansion valve 16 to close, the third expansion valve 19 to open, the f and b ports of the six-way valve 22 to connect and the a and e ports to connect (all other ports are closed), and the a and b ports of the three-way valve 4 to connect (the a and c ports are disconnected); the first circulating pump 1 to operate, the compressor 8 to operate, the blower 9 to operate, the second circulating pump 20 to operate, and the third circulating pump 23 to not operate; the fan 12 to not operate. Additionally, the electric heating element 3 can be deactivated if the heat pump heating efficiency is sufficient, or it can operate to assist in heating if the heat pump heating efficiency is insufficient, depending on the actual situation.

[0052] The refrigerant circulation path of the heat pump circuit is: compressor 8 - port d of the second heat exchanger 2 - port c of the second heat exchanger 2 - first solenoid valve 6 - third expansion valve 19 - port c of the fourth heat exchanger 11 - port a of the fourth heat exchanger 11 - compressor 8.

[0053] The refrigerant in the heat pump circuit comes out of the compressor 8, condenses and releases heat when it flows through the second heat exchanger 2, and provides heat to the heating circuit. Finally, it continuously provides heat to the passenger compartment through the warm air core 10. It expands when it flows through the third expansion valve 19, evaporates and absorbs heat when it flows through the fourth heat exchanger 11, and absorbs heat from the electric drive cooling circuit through the battery circuit.

[0054] The battery circuit and the electric drive cooling circuit are connected, and the refrigerant circulation path is as follows: second circulation pump 20 - port c of third heat exchanger 18 - port d of third heat exchanger 18 - electric drive system 21 - port f of six-way valve 22 - port b of six-way valve 22 - port b of first heat exchanger 5 - port d of first heat exchanger 5 - port b of fourth heat exchanger 11 - port d of fourth heat exchanger 11 - port a of six-way valve 22 - port e of six-way valve 22 - second circulation pump 20. The refrigerant comes out from the second circulation pump 20, flows through the c and d ports of the third heat exchanger 18, flows through the electric drive system 21 to carry away heat, then flows through the f and b ports of the six-way valve 22 to the battery circuit, flows through the first heat exchanger 5, and then flows through the fourth heat exchanger 11 to provide heat to the heat pump circuit. Finally, it flows back to the second circulation pump 20 through the a and e ports of the six-way valve 22, circulating in a cycle to recover waste heat from the electric drive system 21 and provide it to the heat pump circuit, ultimately heating the crew cabin.

[0055] The refrigerant circulation path of the heating circuit is: first circulation pump 1 - second heat exchanger 2 - electric heating element 3 - warm air core 10 - port a of three-way valve 4 - port b of three-way valve 4 - first circulation pump 1.

[0056] The application scenario is as follows: the outside temperature is extremely low, such as below -25°C, making it difficult for the heat pump circuit to obtain heat from the outside. This ① heat pump circuit obtains heat only from the electrically driven cooling circuit, and the heat from the electrically driven cooling circuit is dissipated only through the heat pump circuit. This allows the heat pump system to obtain heat only from the electrically driven cooling circuit through the battery circuit, and then provide the obtained heat to the passenger compartment through the heating circuit, achieving passenger compartment heating at extremely low temperatures.

[0057] ② The heat pump circuit obtains heat from both the outside environment and the electrically driven cooling circuit, and the heat from the electrically driven cooling circuit is dissipated only through the heat pump circuit.

[0058] Specifically, such as Figure 4As shown, the heat pump circuit obtains heat from both the electric drive cooling circuit and the outside environment through the third heat exchanger 18 and the fourth heat exchanger 11, and the heat from the electric drive system 21 is dissipated only through the third heat exchanger 18 and the fourth heat exchanger 11. Control causes: the first solenoid valve 6 to close, the second solenoid valve 15 to close, the first expansion valve 7 to partially open, the second expansion valve 16 to close, the third expansion valve 19 to fully open, the f and b ports of the six-way valve 22 to connect and the a and e ports to connect (all other ports are closed), and the a and b ports of the three-way valve 4 to connect (the a and c ports are disconnected); the first circulating pump 1 to operate, the compressor 8 to operate, the blower 9 to operate, the second circulating pump 20 to operate, and the third circulating pump 23 to stop operating; the fan 12 to operate. Additionally, the electric heating element 3 can be deactivated if the heat pump heating efficiency is sufficient, or it can operate to assist in heating if the heat pump heating efficiency is insufficient, depending on the actual situation.

[0059] The refrigerant circulation path of the heat pump circuit is as follows: compressor 8 - port d of the second heat exchanger 2 - port c of the second heat exchanger 2 - first expansion valve 7 - condenser 14 - port a of the third heat exchanger 18 - port b of the third heat exchanger 18 - third expansion valve 19 - port c of the fourth heat exchanger 11 - port a of the fourth heat exchanger 11 - compressor 8.

[0060] The refrigerant in the heat pump circuit exits from compressor 8 and condenses and releases heat as it flows through the second heat exchanger 2, providing heat to the heating circuit. Ultimately, it continuously provides heat to the passenger compartment through the heater core 10. As it flows through the first expansion valve 7, it expands. Because the third expansion valve 19 is fully open, the refrigerant evaporates and absorbs heat as it flows through the condenser 14 and the fourth heat exchanger 11, thus absorbing heat from the electrically driven cooling circuit via the battery circuit. The refrigerant also undergoes heat exchange as it flows through the third heat exchanger 18, primarily absorbing heat, but its state change is minimal.

[0061] The battery circuit and the electric drive cooling circuit are connected, and the refrigerant circulation path is as follows: second circulation pump 20 - port c of third heat exchanger 18 - port d of third heat exchanger 18 - electric drive system 21 - port f of six-way valve 22 - port b of six-way valve 22 - port b of first heat exchanger 5 - port d of first heat exchanger 5 - port b of fourth heat exchanger 11 - port d of fourth heat exchanger 11 - port a of six-way valve 22 - port e of six-way valve 22 - second circulation pump 20. The refrigerant comes out from the second circulation pump 20, flows through the c and d ports of the third heat exchanger 18, flows through the electric drive system 21 to carry away heat, then flows through the f and b ports of the six-way valve 22 to the battery circuit, flows through the first heat exchanger 5, and provides heat to the heat pump circuit when it flows through the fourth heat exchanger 11. Finally, it flows back to the second circulation pump 20 through the a and e ports of the six-way valve 22, circulating in a cycle to recover waste heat from the electric drive system 21 and provide it to the heat pump circuit, ultimately heating the crew cabin.

[0062] The refrigerant circulation path of the heating circuit is: first circulation pump 1 - second heat exchanger 2 - electric heating element 3 - warm air core 10 - port a of three-way valve 4 - port b of three-way valve 4 - first circulation pump 1.

[0063] The usage scenario is as follows: when the outside temperature is low, such as below -10°C, the heat pump circuit can obtain heat from the outside, but only a small amount. This second type of heat pump circuit obtains heat from both the outside and the electrically driven cooling circuit, and the heat from the electrically driven cooling circuit is dissipated only through the heat pump circuit. This allows the heat pump system to obtain heat from the outside through the condenser 14, and also obtain heat from the electrically driven cooling circuit through the third heat exchanger 18 and the battery circuit. The obtained heat is then provided to the passenger compartment through the heating circuit, achieving passenger compartment heating at lower temperatures.

[0064] ③ The heat pump circuit obtains heat only from the electrically driven cooling circuit, and the heat from the electrically driven cooling circuit is dissipated both through the heat pump circuit and through the heating circuit.

[0065] Specifically, such as Figure 5 As shown, the heat pump circuit obtains heat from the electrically driven cooling circuit only through the fourth heat exchanger 11, and the heat from the electrically driven system 21 is dissipated through the first heat exchanger 5 and the fourth heat exchanger 11. Control causes: the first solenoid valve 6 to open, the second solenoid valve 15 to close, the first expansion valve 7 to close, the second expansion valve 16 to close, the third expansion valve 19 to open, the f and b ports of the six-way valve 22 to connect and the a and e ports to connect (all other ports are closed), and the a and c ports of the three-way valve 4 to connect (the a and b ports are disconnected); the first circulating pump 1 to operate, the compressor 8 to operate, the blower 9 to operate, the second circulating pump 20 to operate, and the third circulating pump 23 to not operate; the fan 12 to not operate. Additionally, the electric heating element 3 can be deactivated if the heat pump heating efficiency is sufficient, or it can operate to assist in heating if the heat pump heating efficiency is insufficient, depending on the actual situation.

[0066] The refrigerant circulation path of the heat pump circuit is as follows: compressor 8 - port d of the second heat exchanger 2 - port c of the second heat exchanger 2 - first solenoid valve 6 - third expansion valve 19 - port c of the fourth heat exchanger 11 - port a of the fourth heat exchanger 11 - compressor 8. The refrigerant in the heat pump circuit exits from compressor 8, condenses and releases heat as it flows through the second heat exchanger 2, providing heat to the heating circuit. Finally, it continuously provides heat to the passenger compartment through the heater core 10. It expands as it flows through the third expansion valve 19, evaporates and absorbs heat as it flows through the fourth heat exchanger 11, and absorbs heat from the electrically driven cooling circuit through the battery circuit.

[0067] The battery circuit and the electric drive cooling circuit are connected. The refrigerant circulation path is as follows: second circulation pump 20 - port c of third heat exchanger 18 - port d of third heat exchanger 18 - electric drive system 21 - port f of six-way valve 22 - port b of six-way valve 22 - port b of first heat exchanger 5 - port d of first heat exchanger 5 - port b of fourth heat exchanger 11 - port d of fourth heat exchanger 11 - port a of six-way valve 22 - port e of six-way valve 22 - second circulation pump 20. The refrigerant exits from the second circulation pump 20, flows through ports c and d of the third heat exchanger 18, flows through the electric drive system 21 to carry away heat, then flows through ports f and b of six-way valve 22 to the battery circuit, flows through the first heat exchanger 5, first providing some heat to the heating circuit, and then providing another portion of heat to the heat pump circuit when flowing through the fourth heat exchanger 11. Finally, it flows back to the second circulation pump 20 through ports a and e of six-way valve 22.

[0068] The circulating flow enables the recovery of waste heat from the electric drive system 21 and provides it to the heat pump circuit, ultimately heating the crew cabin.

[0069] The refrigerant circulation path of the heating circuit is as follows: first circulation pump 1 - second heat exchanger 2 - electric heating element 3 - warm air core 10 - port a of three-way valve 4 - port c of three-way valve 4 - port c of first heat exchanger 5 - port a of first heat exchanger 5 - first circulation pump 1.

[0070] The usage scenario is as follows: the ambient temperature is extremely low, such as below -25°C, making it difficult for the heat pump circuit to obtain heat from the outside. This third heat pump circuit obtains heat only from the electric drive cooling circuit, and the heat from the electric drive cooling circuit is dissipated through both the heat pump circuit and the heating circuit. This allows the heat pump system to obtain heat from the electric drive cooling circuit only through the battery circuit, and then provide the obtained heat to the passenger compartment through the heating circuit, achieving passenger compartment heating at extremely low temperatures. Similar to the usage scenario of mode ①, the difference is that mode ③ can recover heat from the electric drive cooling system through a gradient between the first heat exchanger 5 and the fourth heat exchanger 11, resulting in higher heat utilization of the electric drive system 21. However, this mode requires a higher refrigerant temperature in the electric drive cooling system, meaning that when flowing through the first heat exchanger 5, it can provide heat to the heating circuit rather than absorb heat.

[0071] ④ The heat pump circuit obtains heat from both the outside environment and the electrically driven cooling circuit, and the heat from the electrically driven cooling circuit is dissipated both through the heat pump circuit and through the heating circuit.

[0072] Specifically, such as Figure 6As shown, the heat pump circuit obtains heat from the electrically driven cooling circuit through the third heat exchanger 18 and the fourth heat exchanger 11, and also obtains heat from the outside. The heat from the electrically driven system 21 is dissipated through the first heat exchanger 5, the third heat exchanger 18, and the fourth heat exchanger 11. Control causes: the first solenoid valve 6 to close, the second solenoid valve 15 to close, the first expansion valve 7 to partially open, the second expansion valve 16 to close, the third expansion valve 19 to fully open, the f and b ports of the six-way valve 22 to connect, and the a and e ports to connect (all other ports are closed), and the a and c ports of the three-way valve 4 to connect (the a and b ports are disconnected); the first circulating pump 1 to operate, the compressor 8 to operate, the blower 9 to operate, the second circulating pump 20 to operate, and the third circulating pump 23 to stop operating; the fan 12 to operate. Additionally, the electric heating element 3 can be deactivated if the heat pump heating efficiency is sufficient, or it can operate to assist in heating if the heat pump heating efficiency is insufficient, depending on the actual situation.

[0073] The refrigerant circulation path in the heat pump circuit is as follows: Compressor 8 - port d of the second heat exchanger 2 - port c of the second heat exchanger 2 - first expansion valve 7 - condenser 14 - port a of the third heat exchanger 18 - port b of the third heat exchanger 18 - third expansion valve 19 - port c of the fourth heat exchanger 11 - port a of the fourth heat exchanger 11 - compressor 8. The refrigerant in the heat pump circuit exits from compressor 8, condenses and releases heat as it flows through the second heat exchanger 2, providing heat to the heating circuit. Finally, it continuously provides heat to the passenger compartment through the heater core 10. As it flows through the first expansion valve 7, it expands. Because the third expansion valve 19 is fully open, the refrigerant evaporates and absorbs heat as it flows through the condenser 14 and the fourth heat exchanger 11, thus absorbing heat from the electrically driven cooling circuit via the battery circuit. The refrigerant also undergoes heat exchange when flowing through the third heat exchanger 18, mainly absorbing heat, but the state change is minimal.

[0074] The battery circuit and the electric drive cooling circuit are connected, and the refrigerant circulation path is as follows: second circulation pump 20 - port c of third heat exchanger 18 - port d of third heat exchanger 18 - electric drive system 21 - port f of six-way valve 22 - port b of six-way valve 22 - port b of first heat exchanger 5 - port d of first heat exchanger 5 - port b of fourth heat exchanger 11 - port d of fourth heat exchanger 11 - port a of six-way valve 22 - port e of six-way valve 22 - second circulation pump 20. The refrigerant exits from the second circulation pump 20, flows through ports c and d of the third heat exchanger 18 to provide heat to the heat pump circuit for the first time, flows through the electric drive system 21 to remove heat, then flows through ports f and b of the six-way valve 22 to the battery circuit, flows through the first heat exchanger 5 to provide heat to the heating circuit, and provides heat to the heat pump circuit for the second time when flowing through the fourth heat exchanger 11. Finally, it flows back to the second circulation pump 20 through ports a and e of the six-way valve 22, circulating in a cycle to recover waste heat from the electric drive system 21 and provide it to the heat pump circuit, ultimately heating the crew cabin.

[0075] The refrigerant circulation path of the heating circuit is as follows: first circulation pump 1 - second heat exchanger 2 - electric heating element 3 - warm air core 10 - port a of three-way valve 4 - port c of three-way valve 4 - port c of first heat exchanger 5 - port a of first heat exchanger 5 - first circulation pump 1.

[0076] The usage scenario is as follows: When the ambient temperature is low, such as below -10°C, the heat pump circuit can obtain heat from the outside, but in small amounts. This fourth heat pump circuit obtains heat from both the outside and the electric drive cooling circuit, and the heat from the electric drive cooling circuit is dissipated through both the heat pump circuit and the heating circuit. This allows the heat pump system to obtain heat from the outside through the condenser 14, and also obtain heat from the electric drive cooling circuit through the third heat exchanger 18 and the battery circuit. The obtained heat is then provided to the passenger compartment through the heating circuit, achieving passenger compartment heating at lower temperatures. Similar to the usage scenario of mode ②, the difference is that mode ④ can recover heat from the electric drive cooling system through a gradient of the first heat exchanger 5, the fourth heat exchanger 11, and the third heat exchanger 18, resulting in higher heat utilization of the electric drive system 21. However, this mode requires a higher refrigerant temperature in the electric drive cooling system, meaning that when flowing through the first heat exchanger 5, it can provide heat to the heating circuit rather than absorb heat.

[0077] c. The heat pump system provides a 24-hour heating mode for the power battery.

[0078] Specifically, such as Figure 7 As shown, the heat pump circuit provides heat to the heating circuit through the second heat exchanger 2, and finally provides the heat to the battery circuit through the first heat exchanger 5. Control causes: the first solenoid valve 6 to close, the second solenoid valve 15 to open, the first expansion valve 7 to partially open, the second expansion valve 16 to close, the third expansion valve 19 to close, ports a and c of the six-way valve 22 to connect, and ports a and c of the three-way valve 4 to connect (ports a and b to disconnect); the first circulating pump 1 to operate, the compressor 8 to operate, the blower 9 to stop operating, the third circulating pump 23 to operate, and the fan 12 to operate. Additionally, the electric heating element 3 can be deactivated if the heat pump heating efficiency is sufficient, or it can operate to assist in heating if the heat pump heating efficiency is insufficient, depending on the actual situation. Furthermore, this mode does not restrict the operation of the electric-driven cooling circuit, i.e., it does not restrict the operation of the other ports of the six-way valve 22 or the operating state of the second circulating pump 20.

[0079] The refrigerant circulation path of the heat pump circuit is: compressor 8 - port d of the second heat exchanger 2 - port c of the second heat exchanger 2 - first expansion valve 7 - condenser 14 - second solenoid valve 15 - compressor 8. The refrigerant in the heat pump circuit exits from compressor 8, condenses and releases heat as it flows through the second heat exchanger 2, providing heat to the heating circuit. Finally, it continuously provides heat to the passenger compartment through the heater core 10. When it flows through the first expansion valve 7, it expands; when it flows through the condenser 14, it absorbs heat, acquiring heat from the outside.

[0080] The refrigerant circulation path in the battery circuit is as follows: third circulation pump 23 - power battery 24 (usually flowing through the battery liquid cooling plate) - port b of the first heat exchanger 5 - port d of the first heat exchanger 5 - port b of the fourth heat exchanger 11 - port d of the fourth heat exchanger 11 - port a of the six-way valve 22 - port c of the six-way valve 22 - third circulation pump 23. The refrigerant exits from the third circulation pump 23, flows through the power battery 24 to provide heat, raising the temperature of the power battery 24. When flowing through the first heat exchanger 5, it obtains heat from the heating circuit. When flowing through the fourth heat exchanger 11, there is no change. Finally, it flows back to the third circulation pump 23 through ports a and c of the six-way valve 22, circulating to achieve heating of the power battery 24.

[0081] The refrigerant circulation path in the heating circuit is: First circulation pump 1 - Second heat exchanger 2 - Electric heating element 3 - Warm air core 10 - Port a of three-way valve 4 - Port c of three-way valve 4 - Port c of first heat exchanger 5 - Port a of first heat exchanger 5 - First circulation pump 1. When the refrigerant flows through the second heat exchanger 2, it obtains heat from the heat pump circuit; when it flows through the first heat exchanger 5, it provides heat to the battery circuit. Blower 9 is not operating, so it does not heat the passenger compartment.

[0082] d. The heat pump system provides 24-hour simultaneous heating for the passenger compartment and the power battery.

[0083] The only difference between this mode and mode C is that blower 9 starts working. Specifically, as shown below... Figure 7 As shown, the heat pump circuit provides heat to the heating circuit through the second heat exchanger 2, and finally provides the heat to the battery circuit through the first heat exchanger 5, and provides it to the passenger compartment through the heater core 10. The control causes: the first solenoid valve 6 to close, the second solenoid valve 15 to open, the first expansion valve 7 to partially open, the second expansion valve 16 to close, the third expansion valve 19 to close, ports a and c of the six-way valve 22 to connect, and ports a and c of the three-way valve 4 to connect (ports a and b to disconnect); the first circulation pump 1 to operate, the compressor 8 to operate, the blower 9 to operate, the third circulation pump 23 to operate, and the fan 12 to operate. Additionally, the electric heating element 3 can be deactivated if the heat pump heating efficiency is sufficient, or it can operate to assist heating if the heat pump heating efficiency is insufficient, depending on the actual situation. Furthermore, this mode does not restrict the operation of the electric drive cooling circuit, that is, it does not restrict the operation of the other ports of the six-way valve 22 or the operating state of the second circulation pump 20.

[0084] The refrigerant circulation path of the heat pump circuit is: compressor 8 - port d of the second heat exchanger 2 - port c of the second heat exchanger 2 - first expansion valve 7 - condenser 14 - second solenoid valve 15 - compressor 8. The refrigerant in the heat pump circuit exits from compressor 8, condenses and releases heat as it flows through the second heat exchanger 2, providing heat to the heating circuit. Finally, it continuously provides heat to the passenger compartment through the heater core 10. When it flows through the first expansion valve 7, it expands; when it flows through the condenser 14, it absorbs heat, acquiring heat from the outside.

[0085] The refrigerant circulation path in the battery circuit is as follows: third circulation pump 23 - power battery 24 (usually flowing through the battery liquid cooling plate) - port b of the first heat exchanger 5 - port d of the first heat exchanger 5 - port b of the fourth heat exchanger 11 - port d of the fourth heat exchanger 11 - port a of the six-way valve 22 - port c of the six-way valve 22 - third circulation pump 23. The refrigerant exits from the third circulation pump 23, flows through the power battery 24 to provide heat, raising the temperature of the power battery 24. When flowing through the first heat exchanger 5, it obtains heat from the heating circuit. When flowing through the fourth heat exchanger 11, there is no change. Finally, it flows back to the third circulation pump 23 through ports a and c of the six-way valve 22, circulating to achieve heating of the power battery 24.

[0086] The refrigerant circulation path of the heating circuit is as follows: First circulation pump 1 - Second heat exchanger 2 - Electric heating element 3 - Warm air core 10 - Port a of three-way valve 4 - Port c of three-way valve 4 - Port c of first heat exchanger 5 - Port a of first heat exchanger 5 - First circulation pump 1. When the refrigerant flows through the second heat exchanger 2, it obtains heat from the heat pump circuit; when it flows through the warm air core 10, it works with the blower 9 to provide heat to the passenger compartment; and when it flows through the first heat exchanger 5, it provides heat to the battery circuit.

[0087] e. The heat pump system is in heating mode for the passenger cabin.

[0088] Specifically, the heat pump circuit provides heat to the heating circuit through the second heat exchanger 2, and finally provides the heat to the passenger compartment through the first warm air core 10. The control causes: the first solenoid valve 6 to close, the second solenoid valve 15 to open, the first expansion valve 7 to partially open, the second expansion valve 16 to close, the third expansion valve 19 to close, and the a and b ports of the three-way valve 4 to be connected (the a and c ports to be disconnected); the first circulation pump 1 to operate, the compressor 8 to operate, the blower 9 to operate, and the fan 12 to operate. Additionally, the electric heating element 3 can remain inactive if the heat pump heating efficiency is sufficient, or operate to assist in heating if the heat pump heating efficiency is insufficient, depending on the actual situation. Furthermore, this mode does not restrict the operation of the battery circuit and the electric drive cooling circuit, meaning that the operating status of the six-way valve 22, the second circulation pump 20, and the third circulation pump 23 is not restricted.

[0089] The refrigerant circulation path of the heat pump circuit is: compressor 8 - port d of the second heat exchanger 2 - port c of the second heat exchanger 2 - first expansion valve 7 - condenser 14 - second solenoid valve 15 - compressor 8. The refrigerant in the heat pump circuit exits from compressor 8, condenses and releases heat as it flows through the second heat exchanger 2, providing heat to the heating circuit. Finally, it continuously provides heat to the passenger compartment through the heater core 10. When it flows through the first expansion valve 7, it expands; when it flows through the condenser 14, it absorbs heat, acquiring heat from the outside.

[0090] The refrigerant circulation path of the heating circuit is as follows: first circulation pump 1 - second heat exchanger 2 - electric heating element 3 - heater core 10 - port a of three-way valve 4 - port b of three-way valve 4 - first circulation pump 1. When the refrigerant flows through the second heat exchanger 2, it obtains heat from the heat pump circuit, and when it flows through the heater core 10, it works with the blower 9 to provide heat to the passenger compartment.

[0091] Next, we will introduce the cooling conditions, specifically including three modes: a) passenger compartment cooling mode, b) power battery 24 cooling mode, and c) simultaneous cooling of passenger compartment and power battery 24. The specific working process is described below.

[0092] a. Passenger cabin cooling mode

[0093] When only cooling of the passenger compartment is required, the control causes: the first solenoid valve 6 to close, the second solenoid valve 15 to close, the first expansion valve 7 to open fully, the second expansion valve 16 to open partially, the third expansion valve 19 to close, the six-way valve 22 to close (all channels are closed), and the three-way valve 4 to close; the first circulation pump 1 to stop working, the electric heating element 3 to stop working, the compressor 8 to work, the blower 9 to work, the second circulation pump 20 to stop working, and the third circulation pump 23 to stop working; and the fan 12 to work.

[0094] The refrigerant circulation path of the heat pump circuit is: compressor 8 - port d of the second heat exchanger 2 - port c of the second heat exchanger 2 - first expansion valve 7 - condenser 14 - second expansion valve 16 - evaporator 17 - compressor 8. The refrigerant in the heat pump circuit can be R134a, R744, etc. Since the heating circuit is not working and the first expansion valve 7 is fully open, the refrigerant exiting from the compressor 8 undergoes minimal state change as it flows through the second heat exchanger 2 and the first expansion valve 7. It condenses and releases heat when flowing through the condenser 14, expands when flowing through the second expansion valve 16, and evaporates and absorbs heat when flowing through the evaporator 17. Combined with the blowing of the blower 9, cool air is continuously blown into the passenger compartment, achieving cooling of the passenger compartment.

[0095] b. Power battery 24-hour cooling mode

[0096] When only cooling of the power battery 24 is required, the control causes: the first solenoid valve 6 to close, the second solenoid valve 15 to close, the first expansion valve 7 to open fully, the second expansion valve 16 to close, the third expansion valve 19 to open partially, the a and c ports of the six-way valve 22 to connect (all other ports to close), and the three-way valve 4 to close; the first circulation pump 1 to stop working, the electric heating element 3 to stop working, the compressor 8 to work, the blower 9 to work, the second circulation pump 20 to stop working, the third circulation pump 23 to work, and the fan 12 to work.

[0097] The refrigerant circulation path in the heat pump circuit is as follows: compressor 8 - port d of the second heat exchanger 2 - port c of the second heat exchanger 2 - first expansion valve 7 - condenser 14 - port a of the third heat exchanger 18 - port b of the third heat exchanger 18 - third expansion valve 19 - fourth heat exchanger 11 - compressor 8. The refrigerant in the heat pump circuit exits from compressor 8 and undergoes minimal state change as it flows through the second heat exchanger 2 and the first expansion valve 7. It condenses and releases heat as it flows through condenser 14, expands as it flows through the third expansion valve 19, and evaporates and absorbs heat as it flows through the fourth heat exchanger 11, continuously providing cooling to the battery circuit.

[0098] The refrigerant circulation path in the battery circuit is as follows: third circulation pump 23 - power battery 24 (usually flowing through the battery liquid cooling plate) - port b of the first heat exchanger 5 - port d of the first heat exchanger 5 - port b of the fourth heat exchanger 11 - port d of the fourth heat exchanger 11 - port a of the six-way valve 22 - port c of the six-way valve 22 - third circulation pump 23. The refrigerant in the battery circuit can be water or a special coolant (such as ethylene glycol solution, Glacier refrigerant, etc.). Since the heating circuit is not working and the first expansion valve 7 is fully open, the refrigerant exits from the third circulation pump 23, flows through the power battery 24, and carries away heat through heat exchange. It undergoes minimal change when flowing through the first heat exchanger 5, and obtains cooling energy from the heat pump circuit when flowing through the fourth heat exchanger 11. Finally, it flows back to the third circulation pump 23 through ports a and c of the six-way valve 22, circulating continuously to cool the power battery 24.

[0099] c. Simultaneous 24-hour cooling mode for both the passenger compartment and the power battery

[0100] When simultaneous cooling of the passenger compartment and power battery 24 is required, the control causes: the first solenoid valve 6 to close, the second solenoid valve 15 to close, the first expansion valve 7 to fully open, the second expansion valve 16 to partially open, the third expansion valve 19 to partially open, the a and c ports of the six-way valve 22 to connect (all other ports to close), and the three-way valve 4 to close; the first circulation pump 1 to stop working, the electric heating element 3 to stop working, the compressor 8 to work, the blower 9 to work, the second circulation pump 20 to stop working, the third circulation pump 23 to work, and the fan 12 to work.

[0101] The refrigerant circulation path of the heat pump circuit is: compressor 8 - port d of the second heat exchanger 2 - port c of the second heat exchanger 2 - first expansion valve 7 - condenser 14; part of the refrigerant flowing out of the condenser 14 flows back to the compressor 8 through the third expansion valve 19 and the fourth heat exchanger 11, and the other part flows back to the compressor 8 through the second expansion valve 16 and the evaporator 17.

[0102] The refrigerant in the heat pump circuit comes out of the compressor 8 and does not change its state much when it flows through the second heat exchanger 2 and the first expansion valve 7. It condenses and releases heat when it flows through the condenser 14, expands when it flows through the third expansion valve 19 and the second expansion valve 16, and evaporates and absorbs heat when it flows through the evaporator 17 and the fourth heat exchanger 11, continuously providing cooling capacity to the crew compartment and the battery circuit at the same time.

[0103] The refrigerant circulation path in the battery circuit is as follows: third circulation pump 23 - power battery 24 (usually flowing through the battery liquid cooling plate) - port b of the first heat exchanger 5 - port d of the first heat exchanger 5 - port b of the fourth heat exchanger 11 - port d of the fourth heat exchanger 11 - port a of the six-way valve 22 - port c of the six-way valve 22 - third circulation pump 23. The refrigerant in the battery circuit exits from the third circulation pump 23, flows through the power battery 24, and undergoes heat exchange, carrying away heat. It undergoes minimal change as it flows through the first heat exchanger 5. When it flows through the fourth heat exchanger 11, it obtains cooling energy from the heat pump circuit. Finally, it flows back to the third circulation pump 23 through ports a and c of the six-way valve 22, circulating to cool the power battery 24.

[0104] Additionally, it should be noted that if the electric drive cooling circuit is not working, the refrigerant does not change when flowing through the third heat exchanger 18, and therefore has no effect on the three modes under the above-mentioned cooling conditions. If the electric drive cooling circuit is working and dissipates heat from the electric drive system 21 (the f port and d port of the six-way valve 22 are connected), then it has no effect on the a-passenger compartment cooling mode. Since the refrigerant flowing to the third expansion valve 19 must first flow through the third heat exchanger 18, it will affect the b-power battery 24 cooling mode and the c-passenger compartment and power battery 24 simultaneous cooling mode, causing the temperature of the refrigerant flowing to the third expansion valve 19 to rise, while other aspects remain unchanged, and it can still cool the power battery 24.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading the present invention, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the invention, but these changes, modifications or equivalent substitutions are all within the scope of protection of the pending claims of the invention.

Claims

1. An integrated thermal management system, characterized by, The heat pump circuit, the heating circuit, the battery circuit and the electrically-driven cooling circuit; The heat pump circuit can exchange heat with the heating circuit through the second heat exchanger (2), exchange heat with the electrically-driven cooling circuit through the third heat exchanger (18), exchange heat with the battery circuit through the fourth heat exchanger (11), and provide cold energy to the passenger compartment through the evaporator (17); The heating circuit can provide heat to the passenger compartment through the heater core (10); The battery circuit can communicate with the electrically-driven cooling circuit, exchange heat with the heating circuit through the first heat exchanger (5), and regulate the temperature of the power battery (24); The electrically-driven cooling circuit is used for heat dissipation of the electric drive system (21); The battery circuit comprises a third circulating pump (23); The outlet of the third circulating pump (23) communicates with the b port of the first heat exchanger (5), and the refrigerant flowing between the outlet of the third circulating pump (23) and the b port of the first heat exchanger (5) can exchange heat with the power battery (24); The d port of the first heat exchanger (5) communicates with the b port of the fourth heat exchanger (11); The d port of the fourth heat exchanger (11) communicates with the a port of the six-way valve (22); The b port of the six-way valve (22) communicates with the b port of the first heat exchanger (5); The c port of the six-way valve (22) communicates with the inlet of the third circulating pump (23).

2. The integrated thermal management system of claim 1, wherein, The heat pump circuit comprises a compressor (8), a condenser (14) and an evaporator (17); The outlet of the compressor (8) communicates with the d port of the second heat exchanger (2); The c port of the second heat exchanger (2) communicates with the condenser (14), and a first expansion valve (7) is arranged on the communication pipeline; the c port of the second heat exchanger (2) also communicates with the b port of the third heat exchanger (18), and a first electromagnetic valve (6) is arranged on the communication pipeline; The condenser (14) communicates with the a port of the third heat exchanger (18) and the evaporator (17), and a second expansion valve (16) is arranged on the communication pipeline between the condenser (14) and the evaporator (17); The b port of the third heat exchanger (18) communicates with the d port of the fourth heat exchanger (11), and a third expansion valve (19) is arranged on the communication pipeline; the a port of the fourth heat exchanger (11) and the evaporator (17) both communicate with the inlet of the compressor (8); The inlet of the compressor (8) communicates with the a port of the third heat exchanger (18), and a second electromagnetic valve (15) is arranged on the communication pipeline.

3. The integrated thermal management system of claim 1, wherein, The heating circuit can obtain heat from the heat pump circuit through the second heat exchanger (2), obtain heat through an electric heating element (3) and / or obtain heat from the electrically-driven cooling circuit through the first heat exchanger (5), and transfer the heat to the heater core (10).

4. An integrated thermal management system according to claim 3, wherein, The heating circuit comprises a first circulating pump (1), the electric heating element (3), a three-way valve (4) and the heater core (10). The outlet of the first circulating pump (1) is communicated with the a port of the second heat exchanger (2); The b port of the second heat exchanger (2) is communicated with the warm air core (10), and the refrigerant flowing between the b port of the second heat exchanger (2) and the warm air core (10) can exchange heat with the electric heating element (3); The warm air core (10) is communicated with the a port of the three-way valve (4); the c port of the three-way valve (4) is communicated with the c port of the first heat exchanger (5), and the b port of the three-way valve (4) is communicated with the a port of the first heat exchanger (5); The a port of the first heat exchanger (5) is communicated with the inlet of the first circulating pump (1).

5. The integrated thermal management system of claim 1, wherein, The battery circuit can be communicated with the electrically-driven cooling circuit through the six-way valve (22).

6. An integrated thermal management system according to claim 5, wherein, The battery circuit can obtain heat from the heating circuit through the first heat exchanger (5) and / or from the electrically-driven cooling circuit, and transfer the heat to the power battery (24); the battery circuit can also obtain cold energy from the heat pump circuit through the fourth heat exchanger (11) and transfer the cold energy to the power battery (24).

7. The integrated thermal management system of claim 4, wherein, The electrically-driven cooling circuit comprises a second circulating pump (20) and a radiator (13); The outlet of the second circulating pump (20) is communicated with the c port of the third heat exchanger (18), and the refrigerant flowing between the outlet of the second circulating pump (20) and the c port of the third heat exchanger (18) can exchange heat with the electrically-driven system (21); The d port of the third heat exchanger (18) is communicated with the c port of the six-way valve (22); The e port of the six-way valve (22) is communicated with the inlet of the second circulating pump (20); The d port of the six-way valve (22) is communicated with the radiator (13); The radiator (13) is communicated with the inlet of the second circulating pump (20).

8. The integrated thermal management system of claim 1, wherein, A blower (9) is further included, and the airflow formed by the blower (9) flows into the passenger cabin after passing through the evaporator (17) or the warm air core (10).

9. A method of controlling the integrated thermal management system of claim 7, wherein, The method comprises the following steps: When it is needed to heat the passenger cabin by using the heat of the electrically-driven system (21), the following conditions are controlled: the first electromagnetic valve (6) is opened, the second electromagnetic valve (15) is closed, the first expansion valve (7) is closed, the second expansion valve (16) is closed, the third expansion valve (19) is opened, the f port and the b port of the six-way valve (22) are communicated and the a port and the e port are communicated, the a port and the b port of the three-way valve (4) are communicated and the a port and the c port are disconnected; the first circulating pump (1) is operated, the compressor (8) is operated, the blower (9) is operated, the second circulating pump (20) is operated, the third circulating pump (23) is not operated; and the fan (12) is not operated.

10. The control method according to claim 9, characterized by When it is needed to heat the passenger cabin by using the heat of the electric drive system (21), another control mode is to control to make: the first electromagnetic valve (6) closed, the second electromagnetic valve (15) closed, the first expansion valve (7) partially opened, the second expansion valve (16) closed, the third expansion valve (19) fully opened, the six-way valve (22) f port and b port communication and a port and e port communication, the three-way valve (4) a port and b port communication and a port and c port disconnected; the first circulating pump (1) works, the compressor (8) works, the blower (9) works, the second circulating pump (20) works, the third circulating pump (23) does not work; the fan (12) works.

11. The control method according to claim 9, characterized by, When it is needed to heat the power battery (24) by using the heat of the electric drive system (21), control to make: the first electromagnetic valve (6) closed, the second electromagnetic valve (15) closed, the first expansion valve (7) closed, the second expansion valve (16) closed, the third expansion valve (19) closed, the six-way valve (22) f port and c port communication and b port and e port communication, the three-way valve (4) closed; the first circulating pump (1) does not work, the electric heating element (3) does not work, the compressor (8) does not work, the blower (9) does not work, the second circulating pump (20) works, the third circulating pump (23) works; the fan (12) does not work.

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