Integrated thermal management system and control method thereof

Abstract

The invention discloses an integrated thermal management system and a control method thereof. The system comprises a heat pump loop, a heating loop, a battery loop and an electric drive cooling loop. The heat pump loop can conduct heat exchange with the heating loop through a second heat exchanger and provide heat for the heating loop, can conduct heat exchange with the electrically-driven cooling loop through a third heat exchanger and obtain heat from the electrically-driven cooling loop, and can conduct heat exchange with the battery loop through a fourth heat exchanger and provide heat for the battery loop. The refrigerating capacity can be provided for the passenger compartment through the evaporator; the heating loop can provide heat for the passenger compartment through the warm air core body; the battery loop can be communicated with the electrically-driven cooling loop, can exchange heat with the heating loop through the first heat exchanger, and is used for adjusting the temperature of the power battery; the electric drive cooling loop is used for achieving heat dissipation of the electric drive system and can provide heat for the heat pump system through the third heat exchanger.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management, and in particular to an integrated thermal management system and a control method thereof. Background Art

[0002] With the rapid development of new energy vehicle technology, thermal management systems are gradually moving towards integration, high efficiency and energy saving. However, in winter, due to low temperature conditions, battery performance is greatly limited, and the heat pump system refrigerant circuit also has low efficiency when transporting heat. How to make the vehicle thermal management system operate more reasonably in low or even extremely low temperature environments is the key to determining the range of pure electric vehicles in winter. Summary of the invention

[0003] The problem to be solved by the present invention is to overcome the defects of the prior art and provide an integrated thermal management system and a control method thereof, which can recover the heat of the electric drive system to the power battery and the heat pump, reduce the impact of low temperature on the power battery and the heat pump circuit, and improve the cruising range of pure electric vehicles in winter.

[0004] To solve the above technical problems, the present invention provides an integrated thermal management system, including 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 through a second heat exchanger to provide heat to the heating circuit, can exchange heat with the electric drive cooling circuit through a third heat exchanger to obtain heat from the electric drive cooling circuit, can exchange heat with the battery circuit through a fourth heat exchanger, and can also provide cooling to the passenger compartment through the evaporator; the heating circuit can provide heat to the passenger compartment through a heater core; the battery circuit can be connected to the electric drive cooling circuit, and can exchange heat with the heating circuit through the first heat exchanger to adjust the temperature of the power battery; the electric drive cooling circuit is used to dissipate heat from the electric drive system, and can also provide heat to the heat pump system through the third heat exchanger.

[0005] As an improvement of 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 the port d of the second heat exchanger; the port c of the second heat exchanger is connected to the condenser, and a first expansion valve is provided on the connecting pipeline; the port c of the second heat exchanger is also connected to the port b of the third heat exchanger, and a first solenoid valve is provided on the connecting pipeline; the condenser is connected to the port a of the third heat exchanger and the evaporator, and a second expansion valve is provided on the connecting pipeline between the condenser and the evaporator; the port b of the third heat exchanger is connected to the port d of the fourth heat exchanger, and a third expansion valve is provided on the connecting pipeline; the 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 the port a of the third heat exchanger, and a second solenoid valve is provided on the connecting pipeline.

[0006] As another improvement of 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 heater core to achieve heating of the passenger compartment.

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

[0008] As another improvement of the integrated thermal management system of the present invention, the battery circuit can be connected to the electric drive cooling circuit through a six-way valve. Using a six-way valve to replace the connection mode of multiple sub-components of the water circuit can effectively improve the integration of the system and reduce the 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 cold energy from the heat pump circuit through the fourth heat exchanger, and transfer the cold 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 the port b of the first heat exchanger, and the refrigerant between the outlet of the third circulation pump and the port b of the first heat exchanger flows through the power battery and can exchange heat with the power battery; the port d of the first heat exchanger is connected to the port b of the fourth heat exchanger; the port d of the fourth heat exchanger is connected to the port a of the six-way valve; the port b of the six-way valve is connected to the port b of the first heat exchanger; the port c of the six-way valve is connected to the inlet of the third circulation pump.

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

[0012] As another improvement of the integrated thermal management system of the present invention, the system further includes a blower, and the airflow formed by the blower flows into the passenger compartment for blowing after passing through the evaporator or the heater core.

[0013] In order to solve the above technical problems, the present invention provides, on the other hand, a control method of the above integrated thermal management system, comprising:

[0014] When it is necessary to use the heat of the electric drive system to heat the passenger compartment, the control is such that: the first solenoid valve opens, the second solenoid valve closes, the first expansion valve closes, the second expansion valve closes, the third expansion valve opens, the f port and the b port of the six-way valve are connected, and the a port and the e port are connected, and the other ports are closed, the a port and the b port of the three-way valve are connected, and the a port and the c port are disconnected; the first circulating pump works, the compressor works, the blower works, the second circulating pump works, and the third circulating pump does not work; the fan does not work.

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

[0016] Furthermore, when it is necessary to use the heat of the electric drive system to heat the power battery, the control is such that: the first solenoid valve is closed, the second solenoid valve is closed, the first expansion valve is closed, the second expansion valve is closed, the third expansion valve is closed, the f port and the c port of the six-way valve are connected, and the b port and the e port are connected, and the other ports are closed, and the three-way valve is closed; the first circulation pump does not work, the electric heating element does not work, the compressor does not work, the blower does not work, the second circulation pump works, and the third circulation pump works; the fan does not work.

[0017] In summary, the above-mentioned integrated thermal management system and its control method can meet the heat distribution mode of the whole vehicle under different driving conditions, including passenger compartment temperature control, power battery heat control, electric drive system heat recovery, etc.; in order to solve the problem of low heat absorption efficiency of the heat exchanger caused by the low external ambient temperature in the heat pump mode, the heat of the electric drive cooling circuit can be used as a heat source to provide sufficient heat for the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In the attached picture:

[0019] Figure 1 Schematic diagram of the integrated thermal management system of the present invention.

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

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

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

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

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

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

[0026] In the figure, 1. first circulation 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 circulation pump; 21. electric drive system; 22. six-way valve; 23. third circulation pump; 24. power battery. DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0028] Example 1

[0029] Figure 1 FIG. 1 shows an integrated thermal management system of the present invention. 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 can exchange heat with the heating circuit through the second heat exchanger 2, mainly to provide heat to the heating circuit; can exchange heat with the electric drive cooling circuit through the third heat exchanger 18, mainly to obtain heat from the electric drive cooling circuit; can exchange heat with the battery circuit through the fourth heat exchanger 11, mainly to provide cold to the battery circuit; can also provide cold 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 be connected to the electric drive cooling circuit, and can exchange heat with the heating circuit through the first heat exchanger 5, mainly to obtain heat from the heating circuit, which is used to adjust the temperature of the power battery 24; in addition, 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 achieve heat dissipation of 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 the port d of the second heat exchanger 2; the port c of the second heat exchanger 2 is connected to the condenser 14, and a first expansion valve 7 is provided on the connecting pipeline; the port c of the second heat exchanger 2 is also connected to the port b of the third heat exchanger 18, and a first solenoid valve 6 is provided on the connecting pipeline; the condenser 14 is connected to the port a of the third heat exchanger 18 and the evaporator 17, and a second expansion valve 16 is provided on the connecting pipeline between the condenser 14 and the evaporator 17; the port b of the third heat exchanger 18 is connected to the port d of the fourth heat exchanger 11, and a third expansion valve 19 is provided on the connecting pipeline; the 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 the port a of the third heat exchanger 18, and a second solenoid valve 15 is provided on the connecting pipeline.

[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 heater core 10, cooperating with the blower 9 to achieve heating of the passenger compartment.

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

[0033] The electric heating element 3 may be a PTC (Positive Temperature Coefficient) heating wire, which quickly converts electricity into heat.

[0034] The battery circuit can be controlled to communicate with the electric drive cooling circuit through a six-way valve 22 .

[0035] The battery circuit can obtain heat from the heating circuit and / or from 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 cold energy from the heat pump circuit through the fourth heat exchanger 11, and transfer the cold 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 the b port of the first heat exchanger 5, and the refrigerant between the outlet of the third circulation pump 23 and the b port of the first heat exchanger 5 flows through the power battery 24 and can exchange heat with the power battery 24; the d port of the first heat exchanger 5 is connected to the b port of the fourth heat exchanger 11; the d port of the fourth heat exchanger 11 is connected to the a port of the six-way valve 22; the b port of the six-way valve 22 is connected to the b port of the first heat exchanger 5; the c port of the six-way valve 22 is connected to the inlet of the third circulation pump 23.

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

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

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

[0040] Example 2

[0041] The present invention provides a control method for the above-mentioned integrated thermal management system, which can put the entire system in different working modes by controlling the working status of each component such as the expansion valve and the solenoid valve. It should be noted that in the following description process, each valve is in a closed state by default, such as each port of the three-way valve 4 and the six-way valve 22 are closed. Various components such as the compressor 8, the circulating pump, the blower 9, etc. are in a non-working state by default. The expansion valve has three states: closed state, fully open state and adjustment state (or partially open state); the electric drive system 21 of the present invention mainly includes a motor and an electronic control, but does not include a power battery 24; the four heat exchangers are all plate heat exchangers, one side is the water side and the other side is the refrigerant side. In addition, the description of the following control mode does not constitute a limitation on the control method of the present invention, and other modes based on the present invention obtained by ordinary technicians in this field without making creative work should belong to the protection scope of the present invention.

[0042] First, the heating working conditions are introduced, which specifically include five modes: a. heat recovery from the electric drive system 21 to the power battery 24; b. heat recovery from the electric drive system 21 to the passenger compartment; c. heat pump system heating the power battery 24; d. heat pump system heating the passenger compartment and the power battery 24 at the same time; and e. heat pump system heating the passenger compartment. The specific working process is described as follows.

[0043] a. Mode of recovering heat from the electric drive system 21 to the power battery 24

[0044] When it is necessary to use the heat of the electric drive system 21 to heat the power battery 24, Figure 2 As shown, the control is such that: the first solenoid valve 6 is closed, the second solenoid valve 15 is closed, the first expansion valve 7 is closed, the second expansion valve 16 is closed, the third expansion valve 19 is closed, the f port and the c port of the six-way valve 22 are connected and the b port and the e port are connected (other ports are closed), and the three-way valve 4 is closed; the first circulation 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 circulation pump 20 works, and the third circulation pump 23 works; the fan 12 does not work.

[0045] Heat pump circuit not working.

[0046] The battery circuit is connected to the electric drive cooling circuit, and the refrigerant circulation path is: the third circulation pump 23-power battery 24 (usually flowing through the battery liquid cooling plate)-port b of the six-way valve 22-port e of the six-way valve 22-second circulation pump 20-port c of the third heat exchanger 18-port d of the third heat exchanger 18-electric drive system 21-port f of the six-way valve 22-port c of the six-way valve 22-third circulation pump 23. The refrigerant comes out of the third circulation pump 23, flows through the power battery 24, performs heat exchange to provide heat, heats the power battery 24, flows to the inlet of the second circulation pump 20 through the ports b and e of the six-way valve 22, then flows through the second circulation pump 20, the ports c and d of the third heat exchanger 18, flows through the electric drive system 21 to take away heat, and finally flows back to the third circulation pump 23 through the ports f and c of the six-way valve 22, circulates, realizes the recovery of waste heat of the electric drive system 21, and heats the power battery 24.

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

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

[0049] When the heat of the electric drive system 21 is needed to heat the passenger compartment, the heat recovery mode of the electric drive system 21 to the passenger compartment is divided into the following four modes:

[0050] ① The heat pump circuit only obtains heat from the electric drive cooling circuit, and the heat of the electric drive cooling circuit is only dissipated through the heat pump circuit

[0051] Specifically, Figure 3 As shown, the heat pump circuit only obtains heat from the electric drive cooling circuit through the fourth heat exchanger 11, and the heat of the electric drive system 21 is only dissipated through the fourth heat exchanger 11. Control makes: the first solenoid valve 6 open, the second solenoid valve 15 closed, the first expansion valve 7 closed, the second expansion valve 16 closed, the third expansion valve 19 open, the f port and the b port of the six-way valve 22 are connected and the a port and the e port are connected (the other ports are closed), and the a port and the b port of the three-way valve 4 are connected (the a port and the c port are disconnected); the first circulation pump 1 works, the compressor 8 works, the blower 9 works, the second circulation pump 20 works, and the third circulation pump 23 does not work; the fan 12 does not work. In addition, according to the actual situation, the electric heating element 3 can not work if the heat pump heating efficiency is sufficient, and can work to assist heating if the heat pump heating efficiency is insufficient.

[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 of the heat pump circuit comes out of the compressor 8, condenses and releases heat when flowing through the second heat exchanger 2, provides heat to the heating circuit, and finally passes through the heater core 10 to continuously provide heat to the passenger compartment, expands when flowing through the third expansion valve 19, evaporates and absorbs heat when flowing 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: second circulation pump 20-port C of the third heat exchanger 18-port d of the third heat exchanger 18-electric drive system 21-port f of the six-way valve 22-port b of the six-way valve 22-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 e of the six-way valve 22-second circulation pump 20. The refrigerant comes out of the second circulation pump 20, flows through the c port and the d port of the third heat exchanger 18, flows through the electric drive system 21 to take away heat, and then flows to the battery circuit through the f port and the b port of the six-way valve 22, flows through the first heat exchanger 5, and then flows through the fourth heat exchanger 11 to provide heat to the heat pump circuit, and finally flows back to the second circulation pump 20 through the a port and the e port of the six-way valve 22, circulating to recover the waste heat of the electric drive system 21 and provide it to the heat pump circuit, and finally heat the passenger compartment.

[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 usage scenario is: the outside temperature is extremely low, such as below -25℃, and it is difficult for the heat pump circuit to obtain heat from the outside. The heat pump circuit only obtains heat from the electric drive cooling circuit, and the heat of the electric drive cooling circuit is only dissipated through the heat pump circuit, so that the heat pump system obtains heat from the electric drive cooling circuit only through the battery circuit, and provides the obtained heat to the passenger compartment through the heating circuit, realizing heating of the passenger compartment at extremely low temperatures.

[0057] ② The heat pump circuit obtains heat from both the outside and the electric drive cooling circuit, and the heat of the electric drive cooling circuit is only dissipated through the heat pump circuit.

[0058] Specifically, Figure 4As shown, the heat pump circuit obtains heat from the electric drive cooling circuit through the third heat exchanger 18 and the fourth heat exchanger 11, and obtains heat from the outside, and the heat of the electric drive system 21 is also dissipated only through the third heat exchanger 18 and the fourth heat exchanger 11. Control is performed so that: the first solenoid valve 6 is closed, the second solenoid valve 15 is closed, the first expansion valve 7 is partially opened, the second expansion valve 16 is closed, the third expansion valve 19 is fully opened, the f port and the b port of the six-way valve 22 are connected and the a port and the e port are connected (the other ports are closed), and the a port and the b port of the three-way valve 4 are connected (the a port and the c port are disconnected); the first circulation pump 1 works, the compressor 8 works, the blower 9 works, the second circulation pump 20 works, and the third circulation pump 23 does not work; the fan 12 works. In addition, according to the actual situation, the electric heating element 3 can not work if the heat pump heating efficiency is sufficient, and can work to assist heating if the heat pump heating efficiency is insufficient.

[0059] 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-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 comes out of the compressor 8, condenses and releases heat when flowing through the second heat exchanger 2, provides heat to the heating circuit, and finally passes through the heater core 10 to continuously provide heat to the passenger compartment. It expands when flowing through the first expansion valve 7. Since the third expansion valve 19 is fully open, the refrigerant evaporates and absorbs heat when flowing through the condenser 14 and the fourth heat exchanger 11, and absorbs heat from the electric drive cooling circuit through the battery circuit. When the refrigerant flows through the third heat exchanger 18, it also undergoes heat exchange, mainly absorbing heat, but the state does not change much.

[0061] The battery circuit and the electric drive cooling circuit are connected, and the refrigerant circulation path is: second circulation pump 20-port C of the third heat exchanger 18-port d of the third heat exchanger 18-electric drive system 21-port f of the six-way valve 22-port b of the six-way valve 22-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 e of the six-way valve 22-second circulation pump 20. The refrigerant comes out of the second circulation pump 20, flows through the c port and the d port of the third heat exchanger 18, flows through the electric drive system 21 to take away heat, and then flows to the battery circuit through the f port and the b port of the six-way valve 22, flows through the first heat exchanger 5, and provides heat to the heat pump circuit when flowing through the fourth heat exchanger 11, and finally flows back to the second circulation pump 20 through the a port and the e port of the six-way valve 22, circulating to recover the waste heat of the electric drive system 21 and provide it to the heat pump circuit, and finally heat the passenger compartment.

[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: the outside temperature is low, for example, below -10°C, and the heat pump circuit can obtain heat from the outside, but it is less. The heat pump circuit ② obtains heat from both the outside and the electric drive cooling circuit, and the heat of the electric drive cooling circuit is only dissipated through the heat pump circuit, so that the heat pump system obtains heat from the outside through the condenser 14, and obtains heat from the electric drive cooling circuit through the third heat exchanger 18 and the battery circuit, and provides the obtained heat to the passenger compartment through the heating circuit, so as to achieve heating of the passenger compartment at a lower temperature.

[0064] ③ The heat pump circuit only obtains heat from the electric drive cooling circuit, and the heat of the electric drive cooling circuit is dissipated through both the heat pump circuit and the heating circuit

[0065] Specifically, Figure 5 As shown, the heat pump circuit only obtains heat from the electric drive cooling circuit through the fourth heat exchanger 11, and the heat of the electric drive system 21 is dissipated through the first heat exchanger 5 and the fourth heat exchanger 11. Control is performed so that: the first solenoid valve 6 is opened, the second solenoid 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 connected and the a port and the e port are connected (the other ports are closed), and the a port and the c port of the three-way valve 4 are connected (the a port and the b port are disconnected); the first circulation pump 1 works, the compressor 8 works, the blower 9 works, the second circulation pump 20 works, and the third circulation pump 23 does not work; the fan 12 does not work. In addition, according to the actual situation, the electric heating element 3 can not work if the heat pump heating efficiency is sufficient, and can work to assist heating if the heat pump heating efficiency is insufficient.

[0066] 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. The refrigerant of the heat pump circuit comes out of the compressor 8, condenses and releases heat when flowing through the second heat exchanger 2, provides heat to the heating circuit, and finally passes through the heater core 10 to continuously provide heat to the passenger compartment, expands when flowing through the third expansion valve 19, evaporates and absorbs heat when flowing through the fourth heat exchanger 11, and absorbs heat from the electric drive cooling circuit through the battery circuit.

[0067] The battery circuit is connected to the electric drive cooling circuit, and the refrigerant circulation path is: the second circulation pump 20-the c port of the third heat exchanger 18-the d port of the third heat exchanger 18-the electric drive system 21-the f port of the six-way valve 22-the b port of the six-way valve 22-the b port of the first heat exchanger 5-the d port of the first heat exchanger 5-the b port of the fourth heat exchanger 11-the d port of the fourth heat exchanger 11-the a port of the six-way valve 22-the e port of the six-way valve 22-the second circulation pump 20. The refrigerant comes out of the second circulation pump 20, flows through the c port and the d port of the third heat exchanger 18, flows through the electric drive system 21 to take away the heat, and then flows to the battery circuit through the f port and the b port of the six-way valve 22, flows through the first heat exchanger 5, first provides a part of the heat to the heating circuit, and then provides another part of the heat to the heat pump circuit when flowing through the fourth heat exchanger 11, and finally flows back to the second circulation pump 20 through the a port and the e port of the six-way valve 22.

[0068] The circulating flow recovers the waste heat from the electric drive system 21 and provides it to the heat pump circuit, ultimately heating the passenger compartment.

[0069] 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 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: the outside temperature is extremely low, such as below minus 25°C, and it is difficult for the heat pump circuit to obtain heat from the outside. The heat pump circuit ③ only obtains heat from the electric drive cooling circuit, and the heat of the electric drive cooling circuit is dissipated through both the heat pump circuit and the heating circuit, so that the heat pump system only obtains heat from the electric drive cooling circuit through the battery circuit, and provides the obtained heat to the passenger compartment through the heating circuit, so as to achieve heating of the passenger compartment at extremely low temperatures. Similar to the usage scenario of mode ①, the difference is that mode ③ can recover the heat of the electric drive cooling system through the first heat exchanger 5 and the fourth heat exchanger 11, and the heat utilization rate of the electric drive system 21 is relatively high, but this mode requires the refrigerant temperature of the electric drive cooling system to be relatively high, that is, it can provide heat to the heating circuit when flowing through the first heat exchanger 5, instead of absorbing heat.

[0071] ④ The heat pump circuit obtains heat from both the outside and the electric drive cooling circuit, and the heat of the electric drive cooling circuit is dissipated through both the heat pump circuit and the heating circuit.

[0072] Specifically, Figure 6As shown, the heat pump circuit obtains heat from the electric drive cooling circuit through the third heat exchanger 18 and the fourth heat exchanger 11, and obtains heat from the outside, and the heat of the electric drive system 21 is dissipated through the first heat exchanger 5, the third heat exchanger 18 and the fourth heat exchanger 11. Control is performed so that: the first solenoid valve 6 is closed, the second solenoid valve 15 is closed, the first expansion valve 7 is partially opened, the second expansion valve 16 is closed, the third expansion valve 19 is fully opened, the f port and the b port of the six-way valve 22 are connected and the a port and the e port are connected (the other ports are closed), and the a port and the c port of the three-way valve 4 are connected (the a port and the b port are disconnected); the first circulation pump 1 works, the compressor 8 works, the blower 9 works, the second circulation pump 20 works, and the third circulation pump 23 does not work; the fan 12 works. In addition, according to the actual situation, the electric heating element 3 can not work if the heat pump heating efficiency is sufficient, and can work to assist heating if the heat pump heating efficiency is insufficient.

[0073] 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-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 of the heat pump circuit comes out of the compressor 8, condenses and releases heat when flowing through the second heat exchanger 2, provides heat to the heating circuit, and finally passes through the heater core 10 to continuously provide heat to the passenger compartment. It expands when flowing through the first expansion valve 7. Since the third expansion valve 19 is fully open, the refrigerant evaporates and absorbs heat when flowing through the condenser 14 and the fourth heat exchanger 11, and absorbs heat from the electric drive cooling circuit through the battery circuit. When the refrigerant flows through the third heat exchanger 18, it will also undergo heat exchange, mainly absorbing heat, but the state does not change much.

[0074] The battery circuit and the electric drive cooling circuit are connected, and the refrigerant circulation path is: second circulation pump 20-port C of the third heat exchanger 18-port d of the third heat exchanger 18-electric drive system 21-port f of the six-way valve 22-port b of the six-way valve 22-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 e of the six-way valve 22-second circulation pump 20. The refrigerant comes out of the second circulation pump 20, flows through the c port and d port 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 take away the heat, and then flows to the battery circuit through the f port and b port of the six-way valve 22, 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, and finally flows back to the second circulation pump 20 through the a port and e port of the six-way valve 22, circulating to recover the waste heat of the electric drive system 21 and provide it to the heat pump circuit, and finally heats the passenger compartment.

[0075] 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 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: the outside temperature is low, for example, below -10°C, and the heat pump circuit can obtain heat from the outside, but it is less. The ④ heat pump circuit obtains heat from both the outside and the electric drive cooling circuit, and the heat of the electric drive cooling circuit is dissipated through the heat pump circuit and the heating circuit, so that the heat pump system obtains heat from the outside through the condenser 14, and obtains heat from the electric drive cooling circuit through the third heat exchanger 18 and the battery circuit, and provides the obtained heat to the passenger compartment through the heating circuit, so as to achieve heating of the passenger compartment at a lower temperature. Similar to the usage scenario of mode ②, the difference is that mode ④ can recover the heat of the electric drive cooling system through the first heat exchanger 5, the fourth heat exchanger 11 and the third heat exchanger 18, and the heat utilization rate of the electric drive system 21 is high, but this mode requires the refrigerant temperature of the electric drive cooling system to be high, that is, it can provide heat to the heating circuit when flowing through the first heat exchanger 5, instead of absorbing heat.

[0077] c. The heat pump system is in 24 heating mode for power battery

[0078] Specifically, Figure 7 As shown, the heat pump circuit provides heat to the heating circuit through the second heat exchanger 2, and finally provides heat to the battery circuit through the first heat exchanger 5. Control makes: the first solenoid valve 6 closed, the second solenoid valve 15 opened, the first expansion valve 7 partially opened, the second expansion valve 16 closed, the third expansion valve 19 closed, the a port and the c port of the six-way valve 22 connected, the a port and the c port of the three-way valve 4 connected (the a port and the b port are disconnected); the first circulation pump 1 works, the compressor 8 works, the blower 9 does not work, the third circulation pump 23 works; the fan 12 works. In addition, the electric heating element 3 can not work if the heat pump heating efficiency is sufficient, and can work to assist heating if the heat pump heating efficiency is insufficient, according to the actual situation. And this mode does not limit whether the electric drive cooling circuit is running, that is, the other ports of the six-way valve 22 and the working state of the second circulation pump 20 are not limited.

[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 of the heat pump circuit comes out of the compressor 8, condenses and releases heat when flowing through the second heat exchanger 2, provides heat to the heating circuit, and finally passes through the heater core 10 to continuously provide heat to the passenger compartment, expands when flowing through the first expansion valve 7, and absorbs heat when flowing through the condenser 14, obtaining heat from the outside.

[0080] The refrigerant circulation path of the battery circuit is: the 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 comes out of the third circulation pump 23, flows through the power battery 24 to provide heat, so that the temperature of the power battery 24 increases, obtains heat from the heating circuit when flowing through the first heat exchanger 5, and does not change 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 to circulate and heat the power battery 24. .

[0081] The refrigerant circulation path of the heating circuit is: first circulation pump 1-second heat exchanger 2-electric heating element 3-heater 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. The refrigerant obtains heat from the heat pump circuit when flowing through the second heat exchanger 2, and provides heat to the battery circuit when flowing through the first heat exchanger 5. The blower 9 does not work, so the passenger compartment is not heated.

[0082] d. Heat pump system heats the passenger compartment and power battery 24 at the same time

[0083] The difference between this mode and C is that the blower 9 starts to work. Specifically, Figure 7 As shown, the heat pump circuit provides heat to the heating circuit through the second heat exchanger 2, and finally provides heat to the battery circuit through the first heat exchanger 5, and provides heat to the passenger compartment through the heater core 10. Control is performed so that: the first solenoid valve 6 is closed, the second solenoid valve 15 is opened, the first expansion valve 7 is partially opened, the second expansion valve 16 is closed, the third expansion valve 19 is closed, the a port and the c port of the six-way valve 22 are connected, and the a port and the c port of the three-way valve 4 are connected (the a port and the b port are disconnected); the first circulation pump 1 works, the compressor 8 works, the blower 9 works, and the third circulation pump 23 works; the fan 12 works. In addition, the electric heating element 3 can not work if the heat pump heating efficiency is sufficient according to the actual situation, and can work to assist heating if the heat pump heating efficiency is insufficient. And this mode does not limit whether the electric drive cooling circuit is running, that is, the other ports of the six-way valve 22 and the working state of the second circulation pump 20 are not limited.

[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 of the heat pump circuit comes out of the compressor 8, condenses and releases heat when flowing through the second heat exchanger 2, provides heat to the heating circuit, and finally passes through the heater core 10 to continuously provide heat to the passenger compartment, expands when flowing through the first expansion valve 7, and absorbs heat when flowing through the condenser 14, obtaining heat from the outside.

[0085] The refrigerant circulation path of the battery circuit is: the 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 comes out of the third circulation pump 23, flows through the power battery 24 to provide heat, so that the temperature of the power battery 24 increases, obtains heat from the heating circuit when flowing through the first heat exchanger 5, and does not change 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 to circulate and heat the power battery 24.

[0086] The refrigerant circulation path of the heating circuit is: first circulation pump 1-second heat exchanger 2-electric heating element 3-heat 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 heater core 10, it cooperates 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. Heat pump system for passenger compartment heating mode

[0088] Specifically, the heat pump circuit provides heat to the heating circuit through the second heat exchanger 2, and finally provides heat to the passenger compartment through the first warm air core 10. Control is performed so that: the first solenoid valve 6 is closed, the second solenoid valve 15 is opened, the first expansion valve 7 is partially opened, the second expansion valve 16 is closed, the third expansion valve 19 is closed, and the port a and port b of the three-way valve 4 are connected (port a and port c are disconnected); the first circulation pump 1 is working, the compressor 8 is working, and the blower 9 is working; the fan 12 is working. In addition, the electric heating element 3 may not work if the heat pump heating efficiency is sufficient, and may work to assist heating if the heat pump heating efficiency is insufficient, depending on the actual situation. And this mode does not restrict whether the battery circuit and the electric drive cooling circuit are in operation, that is, the working status of the six-way valve 22 and 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 of the heat pump circuit comes out of the compressor 8, condenses and releases heat when flowing through the second heat exchanger 2, provides heat to the heating circuit, and finally passes through the heater core 10 to continuously provide heat to the passenger compartment, expands when flowing through the first expansion valve 7, and absorbs heat when flowing through the condenser 14, obtaining heat from the outside.

[0090] The refrigerant circulation path of the heating circuit is: first circulation pump 1-second heat exchanger 2-electric heating element 3-heating 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 heating core 10, it cooperates with the blower 9 to provide heat to the passenger compartment.

[0091] Next, the cooling working conditions are introduced, which specifically include three modes: a. passenger compartment cooling mode, b. power battery 24 cooling mode, and c. passenger compartment and power battery 24 cooling mode at the same time. The specific working process is described as follows.

[0092] a. Passenger compartment cooling mode

[0093] When only the passenger compartment needs to be cooled, the control is such that: the first solenoid valve 6 is closed, the second solenoid valve 15 is closed, the first expansion valve 7 is fully opened, the second expansion valve 16 is partially opened, the third expansion valve 19 is closed, the six-way valve 22 is closed (all channels are closed), and the three-way valve 4 is closed; the first circulation pump 1 does not work, the electric heating element 3 does not work, the compressor 8 works, the blower 9 works, the second circulation pump 20 does not work, and the third circulation pump 23 does not work; the fan 12 works.

[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 of 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 comes out of the compressor 8, and basically does not change its state when flowing 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. In conjunction with the blower 9, cold air is continuously blown into the passenger compartment to achieve cooling of the passenger compartment.

[0095] b. Power battery 24 cooling mode

[0096] When only the power battery 24 needs to be cooled, the control is such that: the first solenoid valve 6 is closed, the second solenoid valve 15 is closed, the first expansion valve 7 is fully opened, the second expansion valve 16 is closed, the third expansion valve 19 is partially opened, the a port and the c port of the six-way valve 22 are connected (other ports are closed), and the three-way valve 4 is closed; the first circulation pump 1 does not work, the electric heating element 3 does not work, the compressor 8 works, the blower 9 works, the second circulation pump 20 does not work, and the third circulation pump 23 works; the fan 12 works.

[0097] 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-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 of the heat pump circuit comes out of the compressor 8, and basically does not change its state when flowing 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 third expansion valve 19, and evaporates and absorbs heat when flowing through the fourth heat exchanger 11, continuously providing cooling to the battery circuit.

[0098] The refrigerant circulation path of the battery circuit is: the third circulation pump 23-power battery 24 (usually flowing through the battery liquid cold 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 of the battery circuit can be water or a special coolant (such as ethylene glycol solution, glacial refrigerant, etc.). Since the heating circuit is not working and the first expansion valve 7 is fully open, the refrigerant comes out of the third circulation pump 23, flows through the power battery 24, and then takes away heat through heat exchange. There is basically no change when flowing through the first heat exchanger 5. When flowing through the fourth heat exchanger 11, it obtains cold from the heat pump circuit, and finally flows back to the third circulation pump 23 through the ports a and c of the six-way valve 22, and circulates to achieve cooling of the power battery 24.

[0099] c. Passenger compartment and power battery 24 simultaneous cooling mode

[0100] When it is necessary to cool the passenger compartment and the power battery 24 at the same time, the control is such that: the first solenoid valve 6 is closed, the second solenoid valve 15 is closed, the first expansion valve 7 is fully opened, the second expansion valve 16 is partially opened, the third expansion valve 19 is partially opened, the a port and the c port of the six-way valve 22 are connected (other ports are closed), and the three-way valve 4 is closed; the first circulation pump 1 does not work, the electric heating element 3 does not work, the compressor 8 works, the blower 9 works, the second circulation pump 20 does not work, and the third circulation pump 23 works; the fan 12 works.

[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 of the heat pump circuit comes out of the compressor 8, and basically does not change its state when flowing 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 third expansion valve 19 and the second expansion valve 16, and evaporates and absorbs heat when flowing through the evaporator 17 and the fourth heat exchanger 11, continuously providing cooling to the passenger compartment and the battery circuit at the same time.

[0103] The refrigerant circulation path of the battery circuit is: the third circulation pump 23-power battery 24 (usually flowing through the battery liquid cold 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 of the battery circuit comes out from the third circulation pump 23, flows through the power battery 24, and then takes away the heat through heat exchange. There is basically no change when flowing through the first heat exchanger 5. When flowing through the fourth heat exchanger 11, it obtains coldness from the heat pump circuit, and finally flows back to the third circulation pump 23 through ports a and c of the six-way valve 22 to circulate and realize the cooling of the power battery 24.

[0104] In addition, it should be noted that if the electric drive cooling circuit is not working and the refrigerant does not change when flowing through the third heat exchanger 18, it will have no effect on the three modes under the above-mentioned refrigeration conditions; if the electric drive cooling circuit is working and the electric drive system 21 is cooled (the f port and the d port of the six-way valve 22 are connected), then there will be no effect on the a passenger compartment refrigeration mode. Since the refrigerant flowing to the third expansion valve 19 needs to flow through the third heat exchanger 18 first, it will have an impact on the b power battery 24 refrigeration 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 increase. There are no other changes, and the power battery 24 can still be cooled.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

Claims

1. An integrated thermal management system, characterized in that: It includes 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 through the second heat exchanger (2), can exchange heat with the electric drive cooling circuit through the third heat exchanger (18), can exchange heat with the battery circuit through the fourth heat exchanger (11), and can also provide cooling 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 be in communication with the electric drive cooling circuit, and can perform heat exchange with the heating circuit through the first heat exchanger (5), so as to adjust the temperature of the power battery (24); The electric drive cooling circuit is used to dissipate heat from the electric drive system (21).

2. An integrated thermal management system according to claim 1, characterized in that: The heat pump circuit comprises a compressor (8), a condenser (14) and an evaporator (17); The outlet of the compressor (8) is in communication with the port d of the second heat exchanger (2); The port c of the second heat exchanger (2) is connected to the condenser (14), and a first expansion valve (7) is provided on the connecting pipeline; the port c of the second heat exchanger (2) is also connected to the port b of the third heat exchanger (18), and a first solenoid valve (6) is provided on the connecting pipeline; The condenser (14) is connected to the port a of the third heat exchanger (18) and the evaporator (17), and a second expansion valve (16) is provided on the connecting pipeline between the condenser (14) and the evaporator (17); The port b of the third heat exchanger (18) is connected to the port d of the fourth heat exchanger (11), and a third expansion valve (19) is provided on the connecting pipeline; The port a of the fourth heat exchanger (11) and the evaporator (17) are both in communication with the inlet of the compressor (8); The inlet sea area of ​​the compressor (8) is connected to the port a of the third heat exchanger (18), and a second solenoid valve (15) is provided on the connecting pipeline.

3. The integrated thermal management system according to claim 1, characterized in that: 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 heater core (10).

4. The integrated thermal management system according to claim 3, characterized in that: The heating circuit comprises a first circulation pump (1), the electric heating element (3), a three-way valve (4) and the warm air core (10); The outlet of the first circulation pump (1) is in communication with the port a of the second heat exchanger (2); The port b of the second heat exchanger (2) is in communication with the heater core (10), and the refrigerant between the port b of the second heat exchanger (2) and the heater core (10) flows through the electric heating element (3) and is capable of performing heat exchange with the electric heating element (3); The heater core (10) is connected to the port a of the three-way valve (4); the port c of the three-way valve (4) is connected to the port c of the first heat exchanger (5), and the port b of the three-way valve (4) is connected to the port a of the first heat exchanger (5); The port a of the first heat exchanger (5) is in communication with the inlet of the first circulation pump (1).

5. The integrated thermal management system according to claim 1, characterized in that: The battery circuit can be controlled to communicate with the electric drive cooling circuit through a six-way valve (22).

6. The integrated thermal management system according to claim 5, characterized in that: The battery circuit can obtain heat from the heating circuit and / or obtain heat from 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 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 according to claim 6, characterized in that: The battery circuit comprises a third circulation pump (23); The outlet of the third circulation pump (23) is connected to the port b of the first heat exchanger (5), and the refrigerant between the outlet of the third circulation pump (23) and the port b of the first heat exchanger (5) flows through the power battery (24) and can perform heat exchange with the power battery (24); The port d of the first heat exchanger (5) is in communication with the port b of the fourth heat exchanger (11); The port d of the fourth heat exchanger (11) is connected to the port a of the six-way valve (22); The port b of the six-way valve (22) is in communication with the port b of the first heat exchanger (5); The port c of the six-way valve (22) is communicated with the inlet of the third circulation pump (23).

8. The integrated thermal management system according to claim 5, characterized in that: The electrically driven cooling system comprises a second circulating pump (20) and a radiator (13); The outlet of the second circulation pump (20) is connected to the port C of the third heat exchanger (18), and the refrigerant between the outlet of the second circulation pump (20) and the port C of the third heat exchanger (18) flows through the electric drive system (21) and can perform heat exchange with the electric drive system (21); The port d of the third heat exchanger (18) is in communication with the port c of the six-way valve (22); The port e of the six-way valve (22) is in communication with the inlet of the second circulation pump (20); The port d of the six-way valve (22) is in communication with the radiator (13); The radiator (13) is in communication with an inlet of the second circulation pump (20).

9. The integrated thermal management system according to claim 1, characterized in that: It also includes a blower (9), wherein the airflow generated by the blower (9) passes through the evaporator (17) or the heater core (10) and then flows into the passenger compartment for blowing.

10. A control method for an integrated thermal management system according to any one of claims 1 to 9, characterized in that: include: When the heat of the electric drive system (21) is required to heat the passenger compartment, the control is such that: the first solenoid valve (6) is opened, the second solenoid 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 connected and the a port and the e port are connected, the a port and the b port of the three-way valve (4) are connected and the a port and the c port are disconnected; the first circulation pump (1) is operated, the compressor (8) is operated, the blower (9) is operated, the second circulation pump (20) is operated, and the third circulation pump (23) is not operated; and the fan (12) is not operated.

11. The control method according to claim 10, characterized in that: When the heat of the electric drive system (21) is required to heat the passenger compartment, another control method is to control: the first solenoid valve (6) is closed, the second solenoid valve (15) is closed, the first expansion valve (7) is partially opened, the second expansion valve (16) is closed, the third expansion valve (19) is fully opened, the f port and the b port of the six-way valve (22) are connected and the a port and the e port are connected, the a port and the b port of the three-way valve (4) are connected and the a port and the c port are disconnected; the first circulation pump (1) is working, the compressor (8) is working, the blower (9) is working, the second circulation pump (20) is working, and the third circulation pump (23) is not working; the fan (12) is working.

12. The control method according to claim 10, characterized in that: When it is necessary to utilize the heat of the electric drive system (21) to heat the power battery (24), the control is performed so that: the first solenoid valve (6) is closed, the second solenoid valve (15) is closed, the first expansion valve (7) is closed, the second expansion valve (16) is closed, the third expansion valve (19) is closed, the f port and the c port of the six-way valve (22) are connected and the b port and the e port are connected, and the three-way valve (4) is closed; the first circulation 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 circulation pump (20) works, and the third circulation pump (23) works; and the fan (12) does not work.

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