A new energy vehicle secondary circuit thermal management system

Abstract

A secondary loop thermal management system for new energy vehicles includes four circulating water circuits connected by an eight-way valve. The first circulating water circuit connects the first working port of the eight-way valve to the eighth working port via the electric drive system and the first water pump. The second circulating water circuit connects the second working port of the eight-way valve to the second water pump and the heater core. The second water pump connects to the water inlet of the water-cooled condenser. The water outlet of the water-cooled condenser and the heater core are connected to the third working port via a first three-way valve. The third circulating water circuit connects the fourth working port of the eight-way valve to the water inlet of the battery cooler via the third water pump. The water outlet of the battery cooler is connected to the cold air core and the battery via a second three-way valve, and then to the fifth working port. The fourth circulating water circuit connects the sixth working port of the eight-way valve to the seventh working port via the low-temperature radiator. The refrigerant circulation loop connects the compressor exhaust port to the compressor inlet via the refrigerant channel of the water-cooled condenser, the first electronic expansion valve, the refrigerant channel of the battery cooler, and the liquid storage tank.

Description

Technical Field

[0001] This invention relates to thermal management systems for new energy vehicles, and particularly to a secondary circuit thermal management system for new energy vehicles. Background Technology

[0002] Current thermal management systems for new energy vehicles generally use traditional refrigerants such as R134a or R1234yf. However, according to relevant laws and regulations, HFC refrigerants are not environmentally friendly enough and will be replaced by environmentally friendly refrigerants such as R290 that meet the requirements of relevant laws and regulations. However, since R290 is an A3-class (flammable and explosive) refrigerant, its application in passenger vehicles requires consideration of its safety risks. Existing heat pump systems are mainly divided into direct heat pumps, where the internal condenser of the heat pump system enters the passenger compartment, and indirect heat pumps, where the heat pump system heats the passenger compartment by heating the heater core through a water-cooled condenser, and the water-cooled condenser does not enter the passenger compartment. However, both types of heat pump systems achieve cooling through the evaporator, requiring refrigerant to enter the passenger compartment. Furthermore, the switching between cooling and heating circuits is achieved by valves in the refrigerant circuit, making the refrigerant circuit system relatively complex and hindering the application and promotion of R290 refrigerant. In addition, at extremely low temperatures, such as -20°C, current technologies all require the use of high-pressure PTC for heating, which is costly. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes a secondary circuit thermal management system for new energy vehicles. It eliminates the need for a high-pressure PTC, freeing the heat pump system from temperature range limitations and enabling effective operation at low temperatures, thus ensuring comfort. Furthermore, the system is simple and highly reliable.

[0004] The technical objective of this invention is achieved as follows: a secondary circuit thermal management system for new energy vehicles includes a circulating water circuit and a refrigerant circulating circuit. The circulating water circuit comprises four circuits connected by an eight-way control valve. The first circulating water circuit connects to the eighth working port of the eight-way control valve via an electric drive system and a first water pump. The second circulating water circuit connects to the second working port of the eight-way control valve via a second water pump and a heater core. The second water pump is connected to the water inlet of the water-cooled condenser (LCC). The water outlet of the water-cooled condenser and the heater core are connected to the eight-way control valve via a first three-way valve. The third working port of the control valve, the third circulating water route is connected to the water inlet of the battery cooler via the fourth working port of the eight-way control valve and the third water pump. The water outlet of the battery cooler is connected to the cold air core and the battery via the second three-way valve. The cold air core and the battery are connected to the fifth working port of the eight-way control valve. The fourth circulating water route is connected to the seventh working port of the eight-way control valve via the sixth working port of the eight-way control valve and the low-temperature radiator. The refrigerant circulation loop is connected to the compressor's air inlet via the compressor's exhaust port, the refrigerant channel of the water-cooled condenser, the first electronic expansion valve, the refrigerant channel of the battery cooler, and the liquid receiver tank.

[0005] Preferably, the circulating water circuit is replenished with water and vented through a water jug, and the water jug ​​is connected to the first water pump of the first circulating water circuit, the second water pump of the second circulating water circuit, and the battery of the third circulating water circuit through pipes.

[0006] Preferably, the eight-way control valve has five control modes: A, B, C, D, and E. Mode A connects the first working port to the eighth working port, the second working port to the seventh working port, the third working port to the sixth working port, and the fourth working port to the fifth working port. Mode B connects the first working port to the second working port, the third working port to the sixth working port, the fourth working port to the fifth working port, and the seventh working port to the eighth working port. Mode C connects the first working port to the fourth working port, the second working port to the third working port, the fifth working port to the eighth working port, and the sixth working port to the seventh working port. Mode D connects the first working port to the fourth working port, the second working port to the third working port, the fifth working port to the sixth working port, and the seventh working port to the eighth working port. Mode E connects the first working port to the second working port, the third working port to the fourth working port, the fifth working port to the eighth working port, and the sixth working port to the seventh working port.

[0007] Preferably, the compressor of the refrigerant circulation loop is connected to a second electronic expansion valve.

[0008] Preferably, the eight-way control valve has four control modes: A, B, C, and D. In mode A, the first working port of the eight-way control valve is connected to the eighth working port, the second working port is connected to the seventh working port, the third working port is connected to the sixth working port, and the fourth working port is connected to the fifth working port. In mode B, the first working port of the eight-way control valve is connected to the second working port, the third working port is connected to the sixth working port, the fourth working port is connected to the fifth working port, and the seventh working port is connected to the eighth working port. In mode C, the first working port of the eight-way control valve is connected to the fourth working port, the second working port is connected to the third working port, the fifth working port is connected to the eighth working port, and the sixth working port is connected to the seventh working port. In mode D, the first working port of the eight-way control valve is connected to the fourth working port, the second working port is connected to the third working port, the fifth working port is connected to the sixth working port, and the seventh working port is connected to the eighth working port.

[0009] Preferably, the refrigerant circulation loop uses R290 as the refrigerant.

[0010] The beneficial effects of this invention are as follows:

[0011] 1. This invention employs a secondary circuit, using a cold air core and a warm air core to achieve cooling and heating in the passenger cabin, which simplifies the system circuit, reduces costs, and prevents refrigerant from entering the passenger cabin, thus improving safety.

[0012] 2. This invention eliminates the high-voltage PTC structure and achieves the requirements for passenger cabin heating and battery heating at temperatures ranging from -20℃ to -40℃ by optimizing the system architecture.

[0013] 3. This invention simplifies the circulating water circuit by using an eight-way control valve and two three-way valves, thus realizing the integrated modularization of the thermal management system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the five control modes of the eight-way control valve of the present invention. Detailed Implementation

[0016] See Figure 1 , Figure 2 A secondary circuit thermal management system for new energy vehicles includes a circulating water circuit and a refrigerant circulating circuit. The circulating water circuit has four lines connected by an eight-way control valve 9. The first circulating water circuit connects the first working port 1 of the eight-way control valve 9 sequentially through an electric drive system 15 and a first water pump 16 to the eighth working port 8 of the eight-way control valve 9. The second circulating water circuit connects the second working port 2 of the eight-way control valve 9 to a second water pump 17 and a heater core 18. The second water pump 17 is connected to the water inlet of a water-cooled condenser 13. The water outlet of the water-cooled condenser 13 is connected to the second port of a first three-way valve 19. The heater core 18 is connected to the first port of the first three-way valve 19. The third port of the first three-way valve 19 is connected to the third working port 3 of the eight-way control valve 9. The third circulating water circuit connects to the eight-way control valve 9. The fourth working port 4 of the control valve 9 is connected to the water inlet of the battery cooler 11 via the third water pump 20. The water outlet of the battery cooler 11 is connected to the first port of the second three-way valve 21. The second and third ports of the second three-way valve 21 are respectively connected to the cold air core 23 and the battery 21. The cold air core 23 and the battery 22 are connected to the fifth working port 5 of the eight-way control valve 9. The fourth circulating water route is connected to the seventh working port 7 of the eight-way control valve 9 via the sixth working port 6 of the eight-way control valve 9 and the low-temperature radiator 24. The refrigerant circulation loop is that the exhaust port of the compressor 10 is connected to the air inlet of the compressor 10 via the refrigerant channel of the water-cooled condenser 12, the liquid storage tank 13, the first electronic expansion valve 14, and the refrigerant channel of the battery cooler 11. The refrigerant circulation loop uses R290 as the refrigerant.

[0017] In this embodiment of the invention, the kettle 27 replenishes water and vents air from the circulating water circuit. Both are bypass water replenishment structures. The kettle 27 is connected to the first water pump 16 of the first circulating water circuit, the second water pump 17 of the second circulating water circuit, and the battery 22 of the third circulating water circuit via pipes, forming three water replenishment channels. An additional bypass channel is added beside these three water replenishment channels, allowing water to flow through the kettle 27, thus enabling gas-liquid separation within the kettle 27. Since the kettle 27 forms a water replenishment channel with the second water pump 17 of the second circulating water circuit, it can… To reduce the impact of the small water circulation on the heating rate of the warm air, and since the water supply channel of the water tank 27 is not in the main cooling circuit of the passenger cabin, that is, not in the same circuit as the cold air core 23, the volume of the main cooling circuit of the passenger cabin can be reduced, thus reducing the impact of the cooling heat volume on the cooling rate. In addition, the water supply channel formed by the water tank 27 and the second and third circulating water circuits can cover the water supply requirements of different circuits in the five modes of the present invention. The water supply channel formed by the water tank 27 and the first circulating water circuit is optional, and adding this water supply channel can improve the exhaust rate.

[0018] The eight-way control valve 9 described in this embodiment of the invention has five control modes: A, B, C, D, and E, and can achieve 24 functions.

[0019] In mode A, the first working port 1 of the eight-way control valve 9 is connected to the eighth working port 8, the second working port 2 is connected to the seventh working port 7, the third working port 3 is connected to the sixth working port 6, and the fourth working port 4 is connected to the fifth working port 5. By adjusting the first and second three-way valves, seven functions can be realized: single passenger compartment cooling, single battery cooling, simultaneous cooling of battery and passenger compartment, passenger compartment cooling and dehumidification, simultaneous cooling of battery and motor heat storage in passenger compartment, and rapid heating and defrosting of passenger compartment.

[0020] To achieve the single-occupant cabin cooling function, in the A mode of the eight-way control valve 9, the first three-way valve 19 closes the first port and opens the second and third ports; the second three-way valve 21 closes the third port and opens the first and second ports. In the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature, high-pressure R290. The R290 exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290. The condensed R290 then passes through the receiver 12 and the first electronic expansion valve 14, where it absorbs heat from the third circulating water circuit at the battery cooler 11, finally returning to the compressor 10. In the second circulating water circuit, the second water pump 17 provides the water circulation power, and the second circulating water circuit absorbs R290 at the water-cooled condenser 12. The heat is transferred to the low-temperature radiator 24 in the fourth circulating water circuit, and the heat is dissipated to the outside with the assistance of the fan 25. Finally, the water circulates to the water-cooled condenser 12 to continue absorbing heat. In the third circulating water circuit, the third water pump 20 provides the power for water circulation. The heat in the third circulating water circuit is absorbed by the battery cooler 11. The water circulates to the cold air core 23, and with the assistance of the blower 26, it absorbs the heat from the passenger cabin. Finally, the water circulates to the battery cooler 11 for cooling again, completing the single-occupant cabin cooling function.

[0021] To achieve single-battery cooling, in mode A of the eight-way control valve 9, the first three-way valve 19 closes the first port and opens the second and third ports; the second three-way valve 21 closes the second port and opens the first and third ports. In the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature, high-pressure R290. The R290 exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290. After condensation, the R290 passes through the receiver 12 and the first electronic expansion valve 14, then absorbs heat from the third circulating water circuit at the battery cooler 11 before returning to the compressor 10. In the second circulating water circuit, the second water pump 17 provides the power for water circulation, and the second circulating water circuit absorbs R290 at the water-cooled condenser 12. The heat is absorbed and carried to the low-temperature radiator 24 in the fourth circulating water circuit. With the assistance of the fan 25, the heat is dissipated to the outside. Finally, the water circulates to the water-cooled condenser 12 to continue absorbing heat. In the third circulating water circuit, the third water pump 20 provides the power for water circulation. The heat in the third circulating water circuit is absorbed by the battery cooler 11. The water circulates to the battery 22 to cool the battery. Finally, the water circulates to the battery cooler 11 again to cool it, completing the single-battery cooling function.

[0022] To achieve simultaneous cooling of the battery and crew compartment, in the A mode of the eight-way control valve 9, the first three-way valve 19 closes the first port and opens the second and third ports. The second three-way valve 21 opens the first, second, and third ports. In the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature, high-pressure R290. The R290 exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290. After condensation, the R290 passes through the receiver 12 and the first electronic expansion valve 14, then absorbs heat from the third circulating water circuit at the battery cooler 11, finally returning to the compressor 10. In the second circulating water circuit, the second water pump 17 provides the water circulation power, and the second circulating water circuit absorbs R290 at the water-cooled condenser 12. The heat is transferred to the low-temperature radiator 24 in the fourth circulating water path, where it is dissipated to the outside with the assistance of fan 25. Finally, the water circulates to the water-cooled condenser 12 to continue absorbing heat. In the third circulating water path, the third water pump 20 provides the power for water circulation. The heat in the third circulating water path is absorbed by the battery cooler 11. Part of the water circulation carries the cooling capacity to the cooling air core 23 and, with the assistance of blower 26, dissipates the cooling capacity to the passenger compartment. Another part of the water circulation carries the cooling capacity to the battery 22 to cool it. Finally, the water circulates to the battery cooler 11 for further cooling, completing the simultaneous cooling function of the battery and the passenger compartment. The flow rate and temperature of the water circulation between the battery and the cooling air core are regulated by the second three-way valve 21.

[0023] The crew cabin cooling and dehumidification function is achieved in mode A of the eight-way control valve 9. The first three-way valve 19 opens its first, second, and third ports, while the second three-way valve 21 closes its third port and opens its first and second ports. In the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature, high-pressure R290. The R290 exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290. After condensation, the R290 passes through the receiver 12 and is throttled by the first electronic expansion valve 14. It then absorbs heat from the third circulating water circuit at the battery cooler 11 before returning to the compressor 10. In the second circulating water circuit, the second water pump 17 provides the power for water circulation, and the second circulating water circuit absorbs R290 at the water-cooled condenser 12. The heat is distributed as follows: part of the water circulation carries the heat to the low-temperature radiator 24 in the fourth circulation water path, and the heat is dissipated to the outside with the assistance of the fan 25; another part of the water circulation carries the heat to the warm air core 18, and the flow rate of the warm air core is regulated by the three-way valve 19 to regulate the temperature for dehumidification. Finally, all the water is circulated to the water-cooled condenser 12 to continue absorbing heat. In the third circulation water path, the third water pump 20 provides the power for water circulation. The heat in the third circulation water path is absorbed by the battery cooler 11, and the water is circulated to the cold air core 23. With the assistance of the blower 26, the cold energy is dissipated to the passenger compartment. Finally, the water is circulated to the battery cooler 11 for cooling again, completing the passenger compartment cooling and dehumidification function.

[0024] The crew cabin cooling and dehumidification function, along with battery cooling, is achieved in mode A of the eight-way control valve 9. The first three-way valve 19 opens its first, second, and third ports, and the second three-way valve 21 also opens its first, second, and third ports. In the refrigerant circulation loop, compressor 10 compresses R290 refrigerant into high-temperature, high-pressure R290. This R290 exchanges heat with the second circulating water circuit via water-cooled condenser 12, condensing the R290. The condensed R290 then passes through receiver 12 and is throttled by the first electronic expansion valve 14 before absorbing heat from the third circulating water circuit at battery cooler 11. Finally, it returns to compressor 10. In the second circulating water circuit, second water pump 17 provides the power for water circulation, and the second circulating water circuit absorbs R290 at water-cooled condenser 12. The heat from the water circulation is distributed as follows: a portion of the water is carried to the low-temperature radiator 24 in the fourth circulation water path, where it is dissipated to the outside with the assistance of fan 25; another portion is carried to the warm air core 18, where the flow rate is regulated by the first three-way valve 19 to adjust the temperature for dehumidification; finally, all the water is circulated to the water-cooled condenser 12 to continue absorbing heat. In the third circulation water path, the third water pump 20 provides the power for water circulation. The heat from the third circulation water path is absorbed by the battery cooler 11. A portion of the water is circulated to the cold air core 23, where it is dissipated to the passenger compartment with the assistance of blower 26; another portion is circulated to the battery 22 to cool the battery; finally, all the water is circulated to the battery cooler 11 for further cooling. The flow rate and temperature of the water circulation between the battery and the cold air core are regulated by the second three-way valve 21. This completes the function of cooling and dehumidifying the passenger compartment while simultaneously cooling the battery.

[0025] The motor heat storage and rapid passenger cabin heating functions are achieved in mode A of the eight-way control valve 9. The first three-way valve 19 closes its third port and opens its first and second ports. The second three-way valve 21 closes its first, second, and third ports. In the refrigerant circulation loop, compressor 10 compresses R290 refrigerant into high-temperature, high-pressure R290. The R290 exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290. The condensed R290 then passes through the receiver 12, the first electronic expansion valve 14 (throttling), and the battery cooler 11, finally returning to compressor 10. In the second circulating water circuit, the second water pump 17 provides the water circulation power, and the second circulating water circuit absorbs R290 at the water-cooled condenser 12. The heat is carried by the water circulation to the heater core 18, and with the assistance of the blower 26, the heat is dissipated to the passenger compartment. Finally, the water circulates to the water-cooled condenser 12 to continue absorbing heat. In the first circulating water circuit, the first water pump 16 provides the power for water circulation. The water circulation absorbs the heat from the electric drive system 15, causing the water temperature in the circulating water circuit to rise rapidly and store heat. When switching to other heating modes later, it can provide sufficient initial heat for the battery cooler 11 or the battery 22, thus completing the functions of motor heat storage and rapid heating of the passenger compartment.

[0026] To achieve the defrosting function, in mode A of the eight-way control valve 9, the first three-way valve 19 opens its first, second, and third ports, while the second three-way valve 21 closes its second port and opens its first and third ports. In the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature, high-pressure R290. This R290 then exchanges heat with the second circulating water circuit via the water-cooled condenser 12, cooling the R290. After cooling, the R290 passes through the receiver 12, and the first electronic expansion valve is adjusted and throttled, allowing the R290 to flow into the battery cooler 11. At this point, the battery cooler does not absorb heat, and the R290 finally returns to the compressor 10. In the second circulating water circuit, the second water pump 17 provides the power for water circulation, and the second circulating water circuit absorbs R290 at the water-cooled condenser 12. The heat is distributed as follows: part of the water circulation carries the heat to the low-temperature radiator 24 in the fourth circulation water circuit, and the heat is dissipated with the assistance of the fan 25 for defrosting the low-temperature radiator 24; another part of the water circulation carries the heat to the warm air core 18, and the heat is dissipated to the passenger compartment with the assistance of the blower 26; finally, all the water is circulated to the water-cooled condenser 12 to continue absorbing heat and achieve the defrosting function. At this time, the third water pump 20 of the third circulation water circuit does not work.

[0027] In mode B, the first working port of the eight-way control valve is connected to the second working port, the third working port is connected to the sixth working port, the fourth working port is connected to the fifth working port, and the seventh working port is connected to the eighth working port. By adjusting the first and second three-way valves, eight functions can be achieved: electric drive heat dissipation, simultaneous electric drive heat dissipation and passenger compartment cooling, simultaneous electric drive heat dissipation and battery cooling, simultaneous electric drive heat dissipation and battery cooling, and simultaneous electric drive heat dissipation and battery self-circulation.

[0028] In the B mode of the eight-way control valve 9, the first three-way valve 19 closes the first port and opens the second and third ports. The second three-way valve 21 closes the first, second, and third ports. In the first circulating water circuit, the first water pump 16 provides water circulation power. The water circulation absorbs the heat of the electric drive system 15 and passes through the second circulating water circuit to the low-temperature radiator 24 in the fourth circulating water circuit. With the assistance of the fan 25, the heat is dissipated to the outside. Finally, the water circulates back to the electric drive system 15 to continue absorbing heat, thus completing the electric drive cooling function.

[0029] The simultaneous cooling of the crew cabin and the electric drive cooling function are achieved in mode B of the eight-way control valve 9. The first three-way valve 19 closes its first port and opens its second and third ports. The second three-way valve 21 closes its third port and opens its first and second ports. In the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature, high-pressure R290. The R290 exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290. After condensation, the R290 passes through the receiver 12 and the first electronic expansion valve 14, then absorbs heat from the third circulating water circuit at the battery cooler 11, finally returning to the compressor 10. In the first circulating water circuit, the first water pump 16 provides water circulation power, absorbing heat from the electric drive system 15 and flowing to the water-cooled condenser 12. In the second circulating water circuit, the second water pump 17 provides water circulation power, absorbing heat from the R290 and the first circulating water circuit at the water-cooled condenser 12 and carrying the heat to… The low-temperature radiator 24 in the fourth circulating water circuit dissipates heat to the outside with the assistance of fan 25. Finally, the water circulates to the electric drive system 15 and the water-cooled condenser 12 to continue absorbing heat. In the third circulating water circuit, the third water pump 20 provides the power for water circulation. The heat in the third circulating water circuit is absorbed by the battery cooler 11. The water circulates to the cooling core 23, and with the assistance of blower 26, the cold air is dissipated to the passenger compartment. Finally, the water circulates to the battery cooler 11 for further cooling, completing the passenger compartment cooling and electric drive heat dissipation functions. In Mode B, the first, second, and fourth circulating water circuits are connected in series, resulting in high system resistance. Furthermore, the heat absorbed by the water from the electric drive system 15 affects the condensation efficiency of the water-cooled condenser 12. Therefore, two water pumps are needed in series to increase the maximum water flow rate of the system.

[0030] The battery cooling and electric drive heat dissipation functions are achieved in mode B of the eight-way control valve 9. The first three-way valve 19 closes the first port and opens the second and third ports. The second three-way valve 21 closes the second port and opens the first and third ports. In the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature, high-pressure R290. The R290 exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290. The condensed R290... After passing through the reservoir 12 and the first electronic expansion valve 14, the water absorbs heat from the third circulating water circuit at the battery cooler 11 and finally returns to the compressor 10. In the first circulating water circuit, the first water pump 16 provides water circulation power, and the water circulation absorbs heat from the electric drive system 15 and flows to the water-cooled condenser 12 of the first circulating water circuit. In the second circulating water circuit, the second water pump 17 provides water circulation power, and the second circulating water circuit absorbs heat from R290 and the first circulating water circuit at the water-cooled condenser 12 and carries the heat to the low-temperature radiator 24 of the fourth circulating water circuit. With the assistance of the fan 25, the heat is dissipated to the outside. Finally, the water circulates to the electric drive system 15 and the water-cooled condenser 12 to continue absorbing heat. In the third circulating water circuit, the third water pump 20 provides water circulation power, and the heat from the third circulating water circuit is absorbed by the battery cooler 11. The water circulates to the battery 22 to cool the battery, and finally, the water circulates to the battery cooler 11 for cooling again, completing the battery cooling and electric drive heat dissipation functions. The first, second, and fourth circulating water circuits are connected in series, resulting in high system resistance. Furthermore, the heat absorbed by the water from the electric drive system 15 will affect the condensing efficiency of the water-cooled condenser 12. Therefore, two water pumps need to be connected in series to increase the maximum water flow of the system.

[0031] The simultaneous electric-driven heat dissipation function for battery and crew compartment cooling is achieved in mode B of the eight-way control valve 9. The first three-way valve 19 closes the first port and opens the second and third ports. The second three-way valve 21 opens the first, second, and third ports. In the refrigerant circulation loop, compressor 10 compresses R290 refrigerant into high-temperature, high-pressure R290. The R290 then exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290. The condensed R290... After passing through the reservoir 12 and the first electronic expansion valve 14, the heat from the third circulating water circuit is absorbed at the battery cooler 11, and finally returns to the compressor 10. In the first circulating water circuit, the first water pump 16 provides the power for water circulation. The water circulation absorbs the heat from the electric drive system 15 and flows to the water-cooled condenser 12 of the first circulating water circuit. In the second circulating water circuit, the second water pump 17 provides the power for water circulation. The second circulating water circuit absorbs the heat from R290 and the first circulating water circuit at the water-cooled condenser 12 and carries the heat to the low-temperature radiator 24 of the fourth circulating water circuit. Fan 25 assists in dissipating heat to the outside. Finally, the water circulates to the electric drive system 15 and the water-cooled condenser 12 to continue absorbing heat. In the third circulating water path, the third water pump 20 provides the power for water circulation. The heat in the third circulating water path is absorbed by the battery cooler 11. Part of the water circulation carries the cooling energy to the cooling air core 23 and, with the assistance of the blower 26, dissipates the cooling energy to the crew compartment. Another part of the water circulation carries the cooling energy to the battery 22 to cool it. Finally, the water circulates back to the battery cooler 11 for further cooling, completing the cooling of the battery and crew compartment while simultaneously providing heat dissipation for the electric drive system. The flow rate and temperature of both water circulation paths are regulated by the second three-way valve 21.

[0032] The crew cabin cooling and dehumidification function, along with the electric drive heat dissipation function, is achieved in mode B of the eight-way control valve 9. The first three-way valve 19 opens its first, second, and third ports, while the second three-way valve 21 closes its third port and opens its first and second ports. In the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature, high-pressure R290. The R290 then exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290. The condensed R290... After passing through the reservoir 12 and the first electronic expansion valve 14, the water absorbs heat from the third circulating water circuit at the battery cooler 11, and finally returns to the compressor 10. In the first circulating water circuit, the first water pump 16 provides water circulation power, and the water circulation absorbs heat from the electric drive system 15 and flows to the water-cooled condenser 12 of the first circulating water circuit. In the second circulating water circuit, the second water pump 17 provides water circulation power, and the second circulating water circuit absorbs heat from R290 and the first circulating water circuit at the water-cooled condenser 12. A portion of the water circulation carries the heat to the low-temperature radiator 24 of the fourth circulating water circuit, and the heat is dissipated to the outside with the assistance of the fan 25. The water is circulated to the electric drive system 15 in the first circulating water path to continue absorbing heat. Another part of the water circulation carries the heat to the heater core 18. The flow rate of the heater core 18 is adjusted by the first three-way valve 19 to regulate the temperature for dehumidification. The water circulates to the water-cooled condenser 12 to continue absorbing heat. In the third circulating water path, the third water pump 20 provides the power for water circulation. The heat in the third circulating water path is absorbed by the battery cooler 11. The water circulates to the cold air core 23 and, with the assistance of the blower 26, dissipates the cold energy to the passenger compartment. Finally, the water circulates to the battery cooler 11 for cooling again, completing the passenger compartment cooling and dehumidification while simultaneously providing electric drive heat dissipation.

[0033] The crew cabin cooling and dehumidification, battery cooling, and electric drive heat dissipation functions are achieved in mode B of the eight-way control valve 9. The first three-way valve 19 opens its first, second, and third ports, and the second three-way valve 21 also opens its first, second, and third ports. In the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature, high-pressure R290. The R290 then exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290. The condensed R290... After passing through the reservoir 12 and the first electronic expansion valve 14, the water absorbs heat from the third circulating water circuit at the battery cooler 11, and finally returns to the compressor 10. In the first circulating water circuit, the first water pump 16 provides the power for water circulation. The water circulation absorbs heat from the electric drive system 15 and flows to the water-cooled condenser 12 of the first circulating water circuit. In the second circulating water circuit, the second water pump 17 provides the power for water circulation. The second circulating water circuit absorbs heat from R290 and the first circulating water circuit at the water-cooled condenser 12. A portion of the water circulation carries the heat to the low-temperature radiator 24 of the fourth circulating water circuit. With the assistance of the fan 25, the heat is dissipated to the outside and the water circulates back to the first circulating water circuit. The electric drive system 15 continues to absorb heat, while another part of the water circulation carries the heat to the heater core 18. The flow rate of the heater core 18 is adjusted by the first three-way valve 19 to regulate the temperature for dehumidification. The water circulates to the water-cooled condenser 12 to continue absorbing heat. In the third circulating water circuit, the third water pump 20 provides the power for water circulation. The heat in the third circulating water circuit is absorbed by the battery cooler 11. A part of the water circulates to the cold air core 23, and with the assistance of the blower 26, the cold energy is dissipated to the passenger compartment. Another part of the water circulates to the battery 22 to cool the battery. Finally, all the water circulates to the battery cooler 11 for further cooling, completing the passenger compartment cooling and dehumidification, battery cooling, and electric drive heat dissipation functions.

[0034] The battery self-circulation function is achieved in mode B of the eight-way control valve 9. The first three-way valve 19 closes the first, second, and third ports, and the second three-way valve 21 closes the second port and opens the first and third ports. In the third circulating water circuit, the third water pump 20 provides water circulation power, and the water flows through the battery 22 to circulate, thus completing the battery self-circulation function.

[0035] The battery self-circulation and electric drive cooling functions are achieved in mode B of the eight-way control valve 9. The first three-way valve 19 closes the first port and opens the second and third ports. The second three-way valve 21 closes the second port and opens the first and third ports. In the first circulating water circuit, the first water pump 16 provides water circulation power. The water circulation absorbs the heat of the electric drive system 15 and passes through the second circulating water circuit to the low-temperature radiator 24 of the fourth circulating water circuit. With the assistance of the fan 25, the heat is dissipated to the outside. Finally, the water circulates back to the electric drive system 15 to continue absorbing heat. In the third circulating water circuit, the third water pump 20 provides water circulation power. The water flows through the battery 22 and circulates, completing the battery self-circulation and electric drive cooling functions.

[0036] In mode C, the first working port of the eight-way control valve is connected to the fourth working port, the second working port is connected to the third working port, the fifth working port is connected to the eighth working port, and the sixth working port is connected to the seventh working port. By adjusting the first and second three-way valves, five functions can be realized: electric drive waste heat recovery to passenger compartment heating, electric drive and battery waste heat recovery to passenger compartment heating, electric drive waste heat recovery to battery and passenger compartment heating, electric drive waste heat to heat battery, and electric drive waste heat recovery to simultaneously heat and dehumidify the passenger compartment.

[0037] The function of recovering waste heat from the electric drive for crew compartment heating is achieved by the following steps in the C mode of the eight-way control valve 9: First three-way valve 19 closes its third port and opens its first and second ports; second three-way valve 21 closes its third port and opens its first and second ports. In the refrigerant circulation loop, compressor 10 compresses R290 refrigerant into high-temperature, high-pressure R290. The R290 then exchanges heat with the second circulating water circuit through water-cooled condenser 12, condensing the R290. The condensed R290... After passing through the reservoir 12 and the first electronic expansion valve 14, the water absorbs heat from the third circulating water circuit at the battery cooler 11 and finally returns to the compressor 10. In the first circulating water circuit, the first water pump 16 provides water circulation power. The water circulation absorbs heat from the electric drive system 15 and flows to the battery cooler 11 in the third circulating water circuit. The heat is absorbed by the refrigerant circuit. The water returns to the electric drive system 15 in the first circulating water circuit via the cold air core 23 to continue absorbing heat. In the second circulating water circuit, the second water pump 17 provides water circulation power. The second circulating water circuit absorbs heat from R290 at the water-cooled condenser 12. The water circulation carries the heat to the warm air core 18. With the assistance of the blower 26, the heat is dissipated to the passenger compartment. Finally, the water circulation returns to the water-cooled condenser 12 to continue absorbing heat, completing the function of recovering waste heat from the electric drive system to heat the passenger compartment.

[0038] The function of recovering waste heat from the electric drive and battery to heat the crew compartment is achieved by the following steps in the C mode of the eight-way control valve 9: the first three-way valve 19 closes the third port and opens the first and second ports; the second three-way valve 21 closes the second port and opens the first and third ports; in the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature, high-pressure R290; the R290 exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290; the condensed R290... After passing through the reservoir 12 and the first electronic expansion valve 14, the water absorbs heat from the third circulating water circuit at the battery cooler 11 and finally returns to the compressor 10. In the first circulating water circuit, the first water pump 16 provides water circulation power. The water circulation absorbs heat from the electric drive system 15 and flows to the battery cooler 11 in the third circulating water circuit. The heat is absorbed by the refrigerant circuit. The water flows through the battery 22, absorbs the waste heat from the battery 22, and then returns to the electric drive system 15 to continue absorbing heat. In the second circulating water circuit, the second water pump 17 provides water circulation power. The second circulating water circuit absorbs heat from R290 at the water-cooled condenser 12. The water circulation carries the heat to the heater core 18. With the assistance of the blower 26, the heat is dissipated to the passenger compartment. Finally, the water circulation returns to the water-cooled condenser 12 to continue absorbing heat, completing the function of recovering waste heat from the electric drive and battery to heat the passenger compartment.

[0039] The recovery of waste heat from the electric drive into the battery and the crew compartment heating function are achieved through the following steps: In the C mode of the eight-way control valve 9, the first three-way valve 19 closes the third port and opens the first and second ports; the second three-way valve 21 closes the second port and opens the first and third ports; in the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature, high-pressure R290; the R290 exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290; the condensed R290... After passing through the reservoir 12 and the first electronic expansion valve 14, the water absorbs heat from the third circulating water circuit at the battery cooler 11 and finally returns to the compressor 10. In the first circulating water circuit, the first water pump 16 provides water circulation power. The water circulation absorbs heat from the electric drive system 15 and flows to the battery cooler 11 in the third circulating water circuit. The heat is absorbed by the refrigerant circuit. The water flows through the battery 22 to heat the battery 22 and then returns to the electric drive system 15 to continue absorbing heat. In the second circulating water circuit, the second water pump 17 provides water circulation power. The second circulating water circuit absorbs heat from R290 at the water-cooled condenser 12. The water circulation carries the heat to the heater core 18. With the assistance of the blower 26, the heat is dissipated to the passenger compartment. Finally, the water circulation returns to the water-cooled condenser 12 to continue absorbing heat, completing the function of recovering waste heat from the electric drive system to the battery and heating the passenger compartment.

[0040] The battery heating function using waste heat from the electric drive is achieved in the C mode of the eight-way control valve 9. The first three-way valve 19 closes the first, second, and third ports, and the second three-way valve 21 closes the second port and opens the first and third ports. In the first circulating water circuit, the first water pump 16 provides water circulation power. The water circulation absorbs the heat from the electric drive system 15, flows through the battery cooler 11 in the third circulating water circuit, reaches the battery 22, heats the battery 22, and then returns to the electric drive system 15 to continue absorbing heat, thus completing the battery heating function using waste heat from the electric drive.

[0041] The electric drive waste heat recovery function simultaneously enables the crew cabin heating and dehumidification. In the C mode of the eight-way control valve 9, the first three-way valve 19 closes the third port and opens the first and second ports, while the second three-way valve 21 closes the third port and opens the first and second ports. In the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature and high-pressure R290. The R290 exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290. The condensed R290... After passing through the reservoir 12 and the first electronic expansion valve 14, the water absorbs heat from the third circulating water circuit at the battery cooler 11 and finally returns to the compressor 10. In the first circulating water circuit, the first water pump 16 provides water circulation power. The water circulation absorbs heat from the electric drive system 15 and flows to the battery cooler 11 in the third circulating water circuit. The heat is absorbed by the refrigerant circuit, and the water flows to the cold air core 23. The flow rate of the cold air core 23 is adjusted by the second three-way valve 19 to regulate the temperature for dehumidification. The water then returns to the electric drive system 15 in the first circulating water circuit to continue absorbing heat. In the second circulating water circuit, the second water pump 17 provides water circulation power. The second circulating water circuit absorbs heat from R290 at the water-cooled condenser 12. The water circulation carries the heat to the warm air core 18. With the assistance of the blower 26, the heat is dissipated to the passenger compartment. Finally, the water circulation returns to the water-cooled condenser 12 to continue absorbing heat, completing the electric drive waste heat recovery and passenger compartment heating and dehumidification functions.

[0042] In mode D, the first working port of the eight-way control valve is connected to the fourth working port, the second working port is connected to the third working port, the fifth working port is connected to the sixth working port, and the seventh working port is connected to the eighth working port. By adjusting the first and second three-way valves, three functions can be realized: electric drive and ambient waste heat recovery to the passenger compartment for heating, electric drive and ambient waste heat recovery to the battery and passenger compartment for heating, and electric drive and ambient waste heat recovery to simultaneously heat and dehumidify the passenger compartment.

[0043] The electric drive and environmental waste heat recovery for crew cabin heating are achieved in the D mode of the eight-way control valve 9. The first three-way valve 19 closes its third port and opens its first and second ports. The second three-way valve 21 closes its third port and opens its first and second ports. In the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature, high-pressure R290. The R290 then exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290. The condensed R290... After passing through the reservoir 12 and the first electronic expansion valve 14, the water absorbs heat from the third circulating water circuit at the battery cooler 11 and finally returns to the compressor 10. In the first circulating water circuit, the first water pump 16 provides water circulation power. The water circulation absorbs heat from the electric drive system 15 and flows to the battery cooler 11 in the third circulating water circuit. The heat is absorbed by the refrigerant circuit. After flowing through the cold air core 23, the water flows to the low-temperature radiator 24, absorbs ambient temperature, and then returns to the electric drive system 15 to continue absorbing heat. In the second circulating water circuit, the second water pump 17 provides water circulation power. The second circulating water circuit absorbs heat from R290 at the water-cooled condenser 12. The water circulation carries the heat to the warm air core 18. With the assistance of the blower 26, the heat is dissipated to the passenger compartment. Finally, the water circulation returns to the water-cooled condenser 12 to continue absorbing heat, completing the function of recovering waste heat from the electric drive and the environment to heat the passenger compartment.

[0044] The electric drive and environmental waste heat recovery to the battery and crew cabin heating functions are achieved through the following: In the D mode of the eight-way control valve 9, the first three-way valve 19 closes the third port and opens the first and second ports; the second three-way valve 21 closes the second port and opens the first and third ports; in the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature, high-pressure R290; the R290 exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290; the condensed R290... After passing through the reservoir 12 and the first electronic expansion valve 14, the water absorbs heat from the third circulating water circuit at the battery cooler 11 and finally returns to the compressor 10. In the first circulating water circuit, the first water pump 16 provides water circulation power. The water circulation absorbs heat from the electric drive system 15 and flows to the battery cooler 11 in the third circulating water circuit. The heat is absorbed by the refrigerant circuit. The water flows through the battery 22 to heat the battery 22 and then flows to the low-temperature radiator 24 in the fourth circulating circuit to absorb ambient temperature before returning to the electric drive system 15 to continue absorbing heat. In the second circulating water circuit, the second water pump 17 provides water circulation power. The second circulating water circuit absorbs heat from R290 at the water-cooled condenser 12. The water circulation carries the heat to the heater core 18, and with the assistance of the blower 26, the heat is dissipated to the passenger compartment. Finally, the water circulation returns to the water-cooled condenser 12 to continue absorbing heat, completing the function of recovering waste heat from the electric drive and the environment to the battery and passenger compartment for heating.

[0045] The simultaneous implementation of electric drive and environmental waste heat recovery for crew cabin heating and dehumidification is achieved through the following mechanism: In D mode of the eight-way control valve 9, the first three-way valve 19 closes the third port and opens the first and second ports; the second three-way valve 21 opens the first, second, and third ports; in the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature, high-pressure R290; the R290 exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290; the condensed R290... After passing through the reservoir 12 and the first electronic expansion valve 14, the water absorbs heat from the third circulating water circuit at the battery cooler 11, and finally returns to the compressor 10. In the first circulating water circuit, the first water pump 16 provides water circulation power. The water circulation absorbs heat from the electric drive system 15 and flows to the battery cooler 11 in the third circulating water circuit. The heat is absorbed by the refrigerant circuit. Part of the water flows through the cooling air core 23, and the flow rate of the cooling air core 23 is adjusted by the second three-way valve 21 to regulate the temperature for dehumidification. Another part of the water flows through the battery 22 to heat the battery 22. Then all the water flows to the low-temperature radiator 24 in the fourth circulating circuit to absorb ambient temperature and then returns to the electric drive system 15 to continue absorbing heat. In the second circulating water circuit, the second water pump 17 provides water circulation power. The second circulating water circuit absorbs R290 at the water-cooled condenser 12. The heat is transferred to the heating core 18 by water circulation, and then dissipated to the passenger compartment by the blower 26. Finally, the water is circulated to the water-cooled condenser 12 to continue absorbing heat, thus completing the electric drive and environmental waste heat recovery while providing heating and dehumidification functions for the passenger compartment.

[0046] In E mode, the first working port of the eight-way control valve is connected to the second working port, the third working port is connected to the fourth working port, the fifth working port is connected to the eighth working port, and the sixth working port is connected to the seventh working port. By adjusting the first and second three-way valves, the function of water bypass heat generation for heating the battery and passenger cabin can be realized.

[0047] The water bypass heating system enables heating for the battery and passenger cabin. In E mode of the eight-way control valve 9, the first three-way valve 19 opens the first, second, and third ports, and the second three-way valve 21 opens the first, second, and third ports. In the refrigerant circulation loop, the compressor 10 compresses the R290 refrigerant into high-temperature, high-pressure R290. The R290 exchanges heat with the second circulating water circuit through the water-cooled condenser 12, condensing the R290. The condensed R290... After passing through the reservoir 12 and the first electronic expansion valve 14, the water absorbs heat from the third circulating water circuit at the battery cooler 11, and finally returns to the compressor 10. In the first circulating water circuit, the first water pump 16 provides water circulation power, and the water circulation absorbs heat from the electric drive system 15 and flows to the water-cooled condenser 11 in the second circulating water circuit to continue absorbing heat and reduce the high pressure of R290. It then flows to the battery cooler 11 in the third circulating water circuit, where the heat is absorbed by the refrigerant circuit and the low pressure of R290 is increased, reducing the compressor pressure ratio and improving compressor efficiency. Another part of the water flows through the battery 22, where excess heat is used to heat the battery 22, and finally flows back to the electric drive system 15 to continue absorbing heat. In the second circulating water circuit, the second water pump 17 provides water circulation power, and the second circulating water circuit absorbs R290 at the water-cooled condenser 12. The heat is carried by the water circulation to the heater core 18, and with the assistance of the blower 26, the heat is dissipated to the passenger compartment. Finally, the water circulation returns to the water-cooled condenser 12 to continue absorbing heat, thus completing the water bypass heat generation function for heating the battery and passenger compartment. This function does not require high-pressure PTC heating. In this function, the heat energy converted from the electrical energy of the compressor 10 is used to heat the passenger compartment, the battery cooler 11 absorbs the heat from the water-cooled condenser 12 to ensure that the system operates at extremely low temperatures, and the excess heat from the electric drive system 15 and the compressor 10 is used to heat the battery 22.

[0048] In this embodiment of the invention, the second electronic expansion valve 21 can be bypassed in the compressor 10 of the refrigerant circulation loop. After bypassing the second electronic expansion valve 21, the C mode of the eight-way control valve 9 is used. The hot gas bypass of the compressor 10 can also heat the battery 22 and passenger compartment at low temperatures, achieving the same function as the E mode of the eight-way control valve 9. Therefore, if the second electronic expansion valve 21 is bypassed in the compressor 10, the E mode of the eight-way control valve 9 can be eliminated. In this function, the high-pressure refrigerant at the outlet of the compressor 10 returns to the suction port of the compressor 10 after being throttled by the bypass second electronic expansion valve 21, which can increase the suction low-pressure of the compressor 10. After the low-pressure is increased, the battery cooler 11 can release heat to the water circulation loop. At this time, the heat converted from the power of the compressor 10 is used for passenger compartment heating and battery 22 heating. In the passenger compartment heating or battery 22 heating mode at extremely low temperatures, the bypass second electronic expansion valve 21 opens to achieve the heating function.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A secondary circuit thermal management system for new energy vehicles, comprising a circulating water circuit and a refrigerant circulating circuit, characterized in that: There are four circulating water circuits, which are connected by an eight-way control valve (9). The first circulating water circuit is connected to the eighth working port (8) of the eight-way control valve (9) via the first working port (1) of the eight-way control valve (9), the electric drive system (15), and the first water pump (16). The second circulating water circuit is connected to the second water pump (17) and the heater core (18) via the second working port (2) of the eight-way control valve (9). The second water pump (17) is connected to the water inlet of the water-cooled condenser (12). The water outlet of the water-cooled condenser (12) and the heater core (18) are connected to the third working port (3) of the eight-way control valve (9) via the first three-way valve (19). The third circulating water circuit is connected to the fourth working port (4) of the eight-way control valve (9) via... The third water pump (20) is connected to the water inlet of the battery cooler (11). The water outlet of the battery cooler (11) is connected to the cold air core (23) and the battery (22) respectively through the second three-way valve (21). The cold air core (23) and the battery (22) are connected to the fifth working port (5) of the eight-way control valve (9). The fourth circulating water route is connected to the seventh working port (7) of the eight-way control valve (9) through the sixth working port (6) of the eight-way control valve (9) via the low temperature radiator (24). The refrigerant circulation loop is that the exhaust port of the compressor (10) is connected to the air inlet of the compressor (10) in sequence through the refrigerant channel of the water-cooled condenser (12), the liquid storage tank (13), the first electronic expansion valve (14), and the refrigerant channel of the battery cooler (11).

2. The secondary circuit thermal management system for new energy vehicles according to claim 1, characterized in that: The circulating water circuit is replenished with water and vented through a water jug ​​(27). The water jug ​​(27) is connected to the first water pump (16) of the first circulating water circuit, the second water pump (17) of the second circulating water circuit, and the battery (22) of the third circulating water circuit through pipes.

3. The secondary circuit thermal management system for new energy vehicles according to claim 1, characterized in that: The eight-way control valve has five control modes: A, B, C, D, and E. In mode A, the first working port (1) of the eight-way control valve (9) is connected to the eighth working port (8), the second working port (2) is connected to the seventh working port (7), the third working port (3) is connected to the sixth working port (6), and the fourth working port (4) is connected to the fifth working port (5). In mode B, the first working port (1) of the eight-way control valve (9) is connected to the second working port (2), the third working port (3) is connected to the sixth working port (6), the fourth working port (4) is connected to the fifth working port (5), and the seventh working port (7) is connected to the eighth working port (8). In mode C, the first working port (1) of the eight-way control valve (9) is connected to the fourth working port (4). The second working port (2) is connected to the third working port (3), the fifth working port (5) is connected to the eighth working port (8), the sixth working port (6) is connected to the seventh working port (7), the first working port (1) of the eight-way control valve (9) in D mode is connected to the fourth working port (4), the second working port (2) is connected to the third working port (3), the fifth working port (5) is connected to the sixth working port (6), the seventh working port (7) is connected to the eighth working port (8), the first working port (1) of the eight-way control valve (9) in E mode is connected to the second working port (2), the third working port (3) is connected to the fourth working port (4), the fifth working port (5) is connected to the eighth working port (8), the sixth working port (6) is connected to the seventh working port (7).

4. The secondary circuit thermal management system for new energy vehicles according to claim 1, characterized in that: The compressor (10) of the refrigerant circulation loop bypasses the second electronic expansion valve (28).

5. The secondary circuit thermal management system for new energy vehicles according to claim 4, characterized in that: The eight-way control valve has four control modes: A, B, C, and D. In mode A, the first working port (1) of the eight-way control valve (9) is connected to the eighth working port (8), the second working port (2) is connected to the seventh working port (7), the third working port (3) is connected to the sixth working port (6), and the fourth working port (4) is connected to the fifth working port (5). In mode B, the first working port (1) of the eight-way control valve (9) is connected to the second working port (2), the third working port (3) is connected to the sixth working port (6), the fourth working port (4) is connected to the fifth working port (5), and the seventh working port (7) is connected to the eighth working port (8). In C mode, the first working port (1) of the eight-way control valve (9) is connected to the fourth working port (4), the second working port (2) is connected to the third working port (3), the fifth working port (5) is connected to the eighth working port (8), and the sixth working port (6) is connected to the seventh working port (7). In D mode, the first working port (1) of the eight-way control valve (9) is connected to the fourth working port (4), the second working port (2) is connected to the third working port (3), the fifth working port (5) is connected to the sixth working port (6), and the seventh working port (7) is connected to the eighth working port (8).

6. The secondary circuit thermal management system for new energy vehicles according to claim 1, characterized in that: The refrigerant circulation loop uses R290 as the refrigerant.

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