Vehicle thermal management system based on multi-way valve control

Abstract

The invention discloses a vehicle thermal management system based on multi-way valve control. The vehicle heat management system based on multi-way valve control comprises a first refrigerant loop and a second refrigerant loop, the first refrigerant loop is coupled with a heating cooling liquid loop through a first water cooling condenser, and the second refrigerant loop is coupled with an electric drive cooling liquid loop through a second water cooling condenser. The electric drive cooling liquid loop is integrally connected with a battery cooling liquid loop through a multi-way valve, the battery cooling liquid loop comprises a first plate heat exchanger, a battery water pump, a first electric heater, a power battery, the multi-way valve and a second plate heat exchanger which are sequentially connected in series, the power battery is connected with a first bypass pipe in parallel, and the first bypass pipe is connected with the first electric heater and the multi-way valve after being connected with the power battery in parallel. The problem that in the prior art, when a high-temperature electric drive cooling liquid passes through a power battery with a proper or high temperature, the power battery is overheated, so that the service life and safety of the power battery are affected is solved.

Description

Technical Field

[0001] This invention relates to the field of vehicle thermal management system technology, and in particular to a vehicle thermal management system based on multi-way valve control. Background Technology

[0002] A Chinese invention patent application with publication number CN121105689A, entitled "An Indirect Heat Pump Thermal Management System for New Energy Vehicles," discloses a water source heat pump heating mode (recovering waste heat from electric drive and battery). The patent states that "at this time, the electric drive water pump 30 starts, and through the electric drive inlet water temperature sensor 31, the coolant enters the electric drive assembly 32 to absorb heat. Then, it enters the power battery 23 through the five-way valve 22 (1 inlet, 3 outlets; B inlet, 2 outlets), passes through the battery water pump 21, enters the battery cooler 14 to absorb waste heat, and then returns to the electric drive water pump 30 through the five-way valve to complete the cycle." This indicates that when the passenger compartment needs to recover waste heat from the electric drive, the high-temperature electric drive coolant in the electric drive coolant circuit must pass through the power battery, and specifically, it passes through the power battery before passing through the battery cooler. If the power battery temperature is already suitable or high, the passage of the high-temperature electric drive coolant can cause the power battery to overheat, thus affecting the power battery's lifespan and safety. Summary of the Invention

[0003] The purpose of this invention is to provide a vehicle thermal management system based on multi-channel valve control, in which the high-temperature electric drive coolant can bypass the power battery when the passenger compartment needs to recover the waste heat of the electric drive but the battery does not, thereby ensuring the life and safety of the power battery.

[0004] To achieve the above-mentioned objectives, the present invention provides a vehicle thermal management system based on multi-channel valve control, employing the following technical solution:

[0005] A vehicle thermal management system based on multi-way valve control includes a refrigerant circuit one and a refrigerant circuit two. Refrigerant circuit one includes a compressor one, which is connected to a water-cooled condenser one. The water-cooled condenser one is connected to an air conditioning heat exchanger, which is connected to an air conditioning evaporator and a plate heat exchanger one. The air conditioning evaporator and the plate heat exchanger one are connected in parallel to the compressor one. Refrigerant circuit two includes a compressor two, a water-cooled condenser two, and a plate heat exchanger two connected in series. Refrigerant circuit one is coupled to a heating coolant circuit through the water-cooled condenser one. Refrigerant circuit two is coupled to an electric drive coolant circuit through the water-cooled condenser two. The electric drive coolant circuit is integrated with a battery coolant circuit through a multi-way valve. The battery coolant circuit includes a plate heat exchanger one, a battery water pump, an electric heater one, a power battery, a multi-way valve, and a plate heat exchanger two connected in series. The power battery is connected in parallel to a bypass pipe one. The bypass pipe one and the power battery are connected in parallel to the electric heater one and the multi-way valve, respectively.

[0006] Preferably, the air conditioning heat exchanger is connected in parallel with a second bypass pipe, a first shut-off valve is installed on the branch where the air conditioning heat exchanger is located, and a second shut-off valve is installed on the second bypass pipe.

[0007] Preferably, the electric drive coolant circuit includes a high-voltage controller, a motor, an auxiliary machine, a multi-way valve, a motor cryogenic water tank, an electric drive water pump, and a water-cooled condenser connected in series. The motor cryogenic water tank is connected in parallel with a bypass pipe, which connects the multi-way valve and the electric drive water pump.

[0008] Preferably, the multi-way valve includes a four-way water valve, a three-way water valve one, and a three-way water valve two. The three ports of the three-way water valve one are respectively connected to the four-way water valve, the power battery, and the bypass pipe one. The four ports of the four-way water valve are respectively connected to the auxiliary machine, the plate heat exchanger two, the three-way water valve one, and the three-way water valve two. The three ports of the three-way water valve two are respectively connected to the four-way water valve, the bypass pipe two, and the motor low-temperature water tank.

[0009] The heating cooling fluid circuit includes an air conditioning water pump, a water-cooled condenser, and a heater core connected in series.

[0010] Preferably, the heating coolant circuit further includes an electric heater.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] 1. When the crew compartment needs to recover waste heat from the electric drive, the connection between the power battery and the multi-way valve is disconnected through the bypass pipe. At this time, the high-temperature electric drive coolant no longer passes through the power battery, avoiding the power battery from overheating due to the high temperature of the electric drive coolant, thus ensuring the life and safety of the power battery. In addition, in extremely cold environments, when the electric drive coolant circuit needs to store heat for the refrigerant circuit 1 and the battery temperature is low, the connection between the power battery and the multi-way valve can also be disconnected through the bypass pipe. This prevents the heat stored in the electric drive coolant circuit from being absorbed by the power battery, thereby quickly raising the coolant temperature in the heat exchanger to meet the start-up conditions of the refrigerant circuit 1. After the refrigerant circuit 1 is running, it can heat the crew compartment. At this time, the electric heater 2 in the heating coolant circuit becomes dispensable. Removing it can save costs, while keeping it can be used to enhance the heating of the crew compartment.

[0013] 2. Refrigerant circuit one and refrigerant circuit two can exchange heat with the battery coolant circuit at the same time, meeting the large cooling capacity requirements during super-fast charging of the power battery; at the same time, it supports application scenarios where motor waste heat, power battery waste heat recovery, and heating and dehumidification are performed simultaneously.

[0014] 3. Compared with existing refrigerant circuits, the refrigerant circuit has a simpler structure, uses fewer valves, and therefore has lower cost, lower risk of refrigerant leakage, higher safety, and is easier to operate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the vehicle thermal management system based on multi-channel valve control according to the present invention.

[0016] Figure 2 This is the working principle diagram for working condition one.

[0017] Figure 3 This is the working principle diagram for working condition two.

[0018] Figure 4 This is the working principle diagram for working condition three.

[0019] Figure 5 This is the working principle diagram for working condition four.

[0020] Figure 6 This is the working principle diagram for working condition five.

[0021] Figure 7 This is the working principle diagram for working condition six.

[0022] Figure 8 This is the working principle diagram for working condition seven.

[0023] The components are as follows: 1. Compressor 1; 2. Water-cooled condenser 1; 3. Air conditioning heat exchanger; 4. One-way valve 1; 5. Liquid storage tank 1; 6. Intermediate heat exchanger 1; 7. Plate heat exchanger 1; 8. Control valve 1; 9. Control valve 2; 10. Air conditioning evaporator; 11. One-way valve 2; 12. Shut-off valve 1; 13. Bypass pipe 2; 14. Shut-off valve 2; 15. Heater core; 16. Electric heater 2; 17. Air conditioning water pump; 18. Compressor 2; 19. Water-cooled condenser 2; 20. Liquid storage tank 2; 21. Intermediate heat exchanger 2; 22. Plate heat exchanger 2; 23. Control valve 3; 24. High-pressure controller; 25. Motor; 26. Auxiliary machine; 27. Four-way water valve; 28. Three-way water valve 1; 29. ​​Three-way water valve 2; 30. Bypass pipe 3; 31. Motor low-temperature water tank; 32. Electric water pump; 33. Battery water pump; 34. Electric heater 1; 35. Power battery; 36. Bypass pipe 1. Detailed Implementation

[0024] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0025] like Figure 1As shown, a vehicle thermal management system based on multi-channel valve control includes a refrigerant circuit one and a refrigerant circuit two. Refrigerant circuit one includes a compressor-1, the outlet of which is connected to a water-cooled condenser-2. The inlet of the condensation passage of the water-cooled condenser-2 is connected to the outlet of the compressor-1. The outlet of the condensation passage of the water-cooled condenser-2 is connected to an air conditioning heat exchanger-3, the inlet of which is connected to the outlet of the condensation passage of the water-cooled condenser-2. The outlet of the air conditioning heat exchanger-3 is connected to a liquid receiver-5 via a one-way valve-4. The outlet of the liquid receiver-5 is connected to an intermediate heat exchanger-6. The inlet of the high-pressure side passage of the intermediate heat exchanger-6 is connected to the outlet of the liquid receiver-5. The outlet of the low-pressure side passage of the intermediate heat exchanger-6 is connected to the compressor-1. The inlet end of heat exchanger 1 is connected to the intermediate heat exchanger 6. The inlet end of the low-pressure side passage of intermediate heat exchanger 6 is connected to plate heat exchanger 7. The outlet end of the evaporation passage of plate heat exchanger 7 is connected to the inlet end of the low-pressure side passage of intermediate heat exchanger 6. The outlet end of the high-pressure side passage of intermediate heat exchanger 6 is connected to the inlet end of the evaporation passage of plate heat exchanger 7 through control valve 8. The outlet end of the high-pressure side passage of intermediate heat exchanger 6 is also connected to air conditioning evaporator 10 through control valve 2 9. The outlet end of air conditioning evaporator 10 is connected to the inlet end of the low-pressure side passage of intermediate heat exchanger 6 through check valve 2 11. Air conditioning evaporator 10 is connected to bypass pipe 2 13 in parallel. A shut-off valve 12 is installed on the branch where the air conditioning heat exchanger is located. A shut-off valve 2 14 is installed on bypass pipe 2. Air conditioning heat exchanger 3 can be shut off through bypass pipe 2 13. In water source heat pump heating mode, the refrigerant path can be shortened, refrigerant flow resistance reduced, and heating efficiency improved. Refrigerant circuit one couples the heating coolant circuit through water-cooled condenser one 2. The heating coolant circuit includes a heater core 15. The inlet of heater core 15 is connected to the outlet of the heat exchange path of water-cooled condenser one 6 via an electric heater two 16. The outlet of heater core 15 is connected to the inlet of the heat exchange path of water-cooled condenser one 6 via an air conditioning water pump 17. Refrigerant circuit two includes a compressor two 18. The outlet of compressor two 18 is connected to water-cooled condenser two 19. The inlet of the condensation path of water-cooled condenser two 19 is connected to the outlet of compressor two 18. The outlet of the condensation path of water-cooled condenser two 19 is connected to a liquid storage tank two 20. The intermediate heat exchanger 20 is connected to the intermediate heat exchanger 21. The inlet of the high-pressure side passage of the intermediate heat exchanger 21 is connected to the outlet of the liquid storage tank 20. The outlet of the low-pressure side passage of the intermediate heat exchanger 21 is connected to the inlet of the compressor 28. The inlet of the low-pressure side passage of the intermediate heat exchanger 21 is connected to the plate heat exchanger 22. The outlet of the high-pressure side passage of the intermediate heat exchanger 21 is connected to the inlet of the evaporation passage of the plate heat exchanger 22 through the control valve 3 23. Control valves 1 8, 2 9, and 3 23 are all electronic expansion valves. The refrigerant circuit 2 is coupled to the electric coolant circuit through the water-cooled condenser 2 19. The electric coolant circuit includes a high-pressure controller 24. The inlet of the high-pressure controller 24 is connected to the outlet of the heat exchange passage of the water-cooled condenser 2 19.The outlet of the high-pressure controller 24 is connected to the motor 25. The outlet of the motor 25 is connected to the auxiliary machine 26. The outlet of the auxiliary machine 26 is connected to a multi-way valve, which includes a four-way water valve 27, a three-way water valve 1 28, and a three-way water valve 29. The a port of the four-way water valve 27 is connected to the outlet of the auxiliary machine 26. The b port of the four-way water valve 27 is connected to the inlet of the heat exchange passage of the plate heat exchanger 22. The c port of the four-way water valve 27 is connected to the a port of the three-way water valve 1 28. The d port of the four-way water valve 27 is connected to the a port of the three-way water valve 29. The b port of the three-way water valve 29 is connected to the bypass pipe 30. The c port of the three-way water valve 29 is connected to the motor low-temperature water tank 31. The motor low-temperature water tank 31 and the bypass pipe 30 are connected in parallel and then connected to the electric water pump 32. The outlet of the electric water pump 32 is connected to the water... The inlet end of the heat exchange passage of the second condenser 19 is connected to the battery coolant circuit via a multi-way valve. The battery coolant circuit includes, in series, a plate heat exchanger 7, a battery water pump 33, an electric heater 34, a power battery 35, a multi-way valve, and a plate heat exchanger 22. A bypass pipe 36 is connected in parallel to the power battery. The bypass pipe 36 and the power battery 35 are connected in parallel to the electric heater 34 and the multi-way valve, respectively. The outlet end of the power battery 35 is connected to the b port of a three-way water valve 28. The a port of the three-way water valve 28 is connected to the inlet end of the heat exchange passage of the second plate heat exchanger 22 via the b port of a four-way water valve 27. The outlet end of the heat exchange passage of the second plate heat exchanger 22 is connected to the inlet end of the heat exchange passage of the first plate heat exchanger 7. The c port of the three-way water valve 28 is connected to the bypass pipe 36.

[0026] A control method for a vehicle thermal management system based on multi-channel valve control, including the following application scenarios:

[0027] Operating Condition 1: Ambient temperature below -20℃, extreme heating of the passenger compartment and independent insulation mode for electric drive.

[0028] like Figure 2As shown, under this operating condition, the a and b ports of the three-way water valve 28 are connected, the a and d ports of the four-way water valve 27 are connected, the b and c ports of the four-way water valve 27 are connected, and the a and b ports of the three-way proportional water valve 29 are connected. This opens the control valve 8, the shut-off valve 14, the compressor 1, the air conditioning water pump 17, the battery water pump 33, the electric water pump 32, the electric heater 1 34, and the electric heater 2 16. Driven by the battery water pump 33, the coolant heated by the electric heater 1 34 flows through the power battery 35, raising its temperature to prevent it from freezing. Then, the high-temperature coolant enters through port b and exits through port a of the three-way water valve 28, and then flows through the four-way water valve 29. The C-port of heat exchanger 7 is the inlet and the B-port is the outlet, carrying heat into heat exchanger 7 to provide a heat source for the vaporization of liquid refrigerant in the evaporation path of heat exchanger 7. The low-temperature, low-pressure gaseous refrigerant is compressed by compressor 1 to form a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant enters water-cooled condenser 2 to release heat. The liquefied refrigerant enters liquid storage tank 5 through bypass pipe 2 13 and enters the evaporation path of heat exchanger 7 through control valve 8 to complete the circulation. Meanwhile, the coolant in the heating coolant circuit absorbs heat in water-cooled condenser 2 and is heated a second time by electric heater 2 16 before entering the heater core 15 to achieve extreme heating of the crew cabin. The coolant in the electric drive coolant circuit circulates in a small circulation coolant circuit composed of high-pressure controller 24, motor 25, auxiliary machine 26 and electric drive water pump 32. After absorbing the heat generated by high-pressure controller 24, motor 25 and auxiliary machine 26 during operation, it is independently insulated.

[0029] This operating condition is suitable for extremely cold weather (ambient temperature below -20℃), where there is no external heat to draw from and the electric drive has no waste heat when it is first started. In this case, the electric heater in the battery coolant circuit is used as the "artificial heat source" of the heat pump.

[0030] Operating Condition 2: Ambient temperature below -20℃, protection mode activated.

[0031] like Figure 3 As shown, under this operating condition, the a and b ports of the three-way water valve 28 are connected, the a and d ports of the four-way water valve 27 are connected, the b and c ports of the four-way water valve 27 are connected, and the a and b ports of the three-way proportional water valve 29 are connected. The electric drive water pump 32, battery water pump 33, air conditioning water pump 17, electric heater 34, and electric heater 16 are turned on. The coolant in the heating coolant circuit is heated by the electric heater 16 to heat the passenger compartment. The coolant in the battery coolant circuit is heated by the electric heater 34 to heat the power battery 35, ensuring that the power battery 35 will not be permanently damaged or lose its discharge capacity due to extreme freezing. The coolant in the electric drive coolant circuit circulates in the small circulation coolant circuit composed of the high-voltage controller 24, motor 25, auxiliary machine 26, and electric drive water pump 32, and absorbs the heat generated by the high-voltage controller 24, motor 25, and auxiliary machine 26 during operation, and then performs independent heat preservation.

[0032] This operating condition is to ensure that the core components of the system are not damaged by freezing when both refrigerant circuit one and refrigerant circuit two are not working.

[0033] Operating Condition 3: Winter Electric-Driven Heat Pump Heating Mode

[0034] like Figure 4 As shown, under this operating condition, the a and c ports of the three-way water valve 28 are connected, the a and b ports of the four-way water valve 27 are connected, the c and d ports of the four-way water valve 27 are connected, and the a and b ports of the three-way proportional water valve 29 are connected. Control valve 8, compressor 1, electric water pump 32, and air conditioning water pump 17 are opened. Under the action of electric water pump 32, the coolant carries away the heat generated during the operation of high-pressure control 24, motor 25, and auxiliary machine 26. The high-temperature coolant enters the heat exchange passage of plate heat exchanger 7, providing heat to the liquid refrigerant in the condensation passage of plate heat exchanger 7. The cooled coolant flows through bypass pipe 36 and then enters from port c and exits from port a of the three-way water valve 28. Then, the refrigerant enters from port C and exits from port D of the four-way water valve 27, then enters from port A and exits from port B of the three-way proportional water valve 29, and finally flows back to the electric water pump 32 to complete the large circulation. The liquid refrigerant in the evaporation path of the plate heat exchanger 7 absorbs heat and vaporizes. The low-temperature and low-pressure gaseous refrigerant is compressed by the compressor 1 to form a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant enters the water-cooled condenser 2 to release heat. The liquefied refrigerant enters the liquid storage tank 5 through the bypass pipe 2 13, and enters the evaporation path of the plate heat exchanger 7 through the control valve 8 to complete the circulation. Meanwhile, the coolant in the heating cooling liquid circuit absorbs heat in the water-cooled condenser 2 to achieve heating of the crew cabin.

[0035] Under this operating condition, the path of coolant to the power battery 35 is forcibly cut off through the bypass pipe 36, preventing the power battery 35 from overheating due to the high temperature of the coolant, thus ensuring the lifespan and safety of the power battery. In addition, under this operating condition, the user can selectively activate the electric heater 16 for supplemental heating as needed to meet the heating requirements of the passenger compartment.

[0036] Operating Condition 4: High-Temperature Fast Charging and High-Cooling Demand Mode in Summer

[0037] like Figure 5As shown, the a and b ports of the three-way water valve 28 are connected, the a and d ports of the four-way water valve 27 are connected, the b and c ports of the four-way water valve 27 are connected, and the a and c ports of the three-way proportional water valve 29 are connected. This opens control valve 8, control valve 9, control valve 23, shut-off valve 12, compressor 1, compressor 2 18, electric water pump 32, and battery water pump 33. After the electric water pump 32 starts, the coolant sequentially carries away the heat from the water-cooled condenser 2 19, as well as the high-pressure control valve 24 and the motor 25. The heat generated during the operation of auxiliary machine 26 is converted into high-temperature coolant which enters the low-temperature water tank 31 of the motor, where it exchanges heat with the outside environment and cools down. The low-temperature coolant then provides cooling for the water-cooled condenser 19, high-pressure control 24, motor 25, and auxiliary machine 26, thus creating a cycle. After compressor 1 starts, the high-temperature, high-pressure gaseous refrigerant condenses after exchanging heat with the outside environment through air conditioning heat exchanger 3, and the liquid refrigerant enters the liquid storage tank 5. At this time, a portion of the high-pressure liquid refrigerant enters the plate heat exchanger 7 through control valve 8, where it returns to the battery coolant. One portion of the high-pressure liquid refrigerant undergoes heat exchange and evaporation, while another portion enters the air conditioning evaporator 10 via control valve 29 to cool the passenger compartment. The low-temperature, low-pressure gaseous refrigerant formed in plate heat exchanger 7 and air conditioning evaporator 10 collects and returns to compressor 11 to complete the cycle. After compressor 218 starts, the high-temperature, high-pressure gaseous refrigerant condenses after heat exchange with the electric drive coolant circuit in water-cooled condenser 219, and the liquid refrigerant enters the liquid storage tank 20. The high-pressure liquid refrigerant enters plate heat exchanger 22 via control valve 323, and then... After heat exchange and evaporation in the battery coolant circuit, the low-temperature, low-pressure gaseous refrigerant gathers and returns to compressor 18 to complete the cycle. After the battery water pump 33 starts, the coolant in the battery coolant circuit carries away the heat generated during the fast charging of the power battery 35. The high-temperature coolant enters from port b and exits from port a of the three-way water valve 28, then enters from port c and exits from port b of the four-way water valve 27, and then enters plate heat exchanger 22 and plate heat exchanger 7 in sequence to complete two cooling cycles, providing a large amount of cooling capacity for the power battery 35.

[0038] Operating Condition 5: Heating and Dehumidification Mode for the Crew Cabin

[0039] like Figure 6As shown, under this operating condition, the a and b ports of the three-way water valve 1 are connected, the a and b ports of the four-way water valve 27 are connected, the d and c ports of the four-way water valve 27 are connected, and the a and b ports of the three-way proportional water valve 29 are connected, connecting the battery coolant circuit and the electric drive coolant circuit in series to form a large circulation coolant circuit. Control valve 1 8, control valve 2 9, shut-off valve 2 14, compressor 1, electric drive water pump 32, and battery water pump 34 are opened. After the electric drive water pump 32 and battery water pump 34 start, the coolant in the large circulation coolant circuit carries away the heat generated by the power battery 35, high-voltage control 24, motor 25, and auxiliary machine 26 during operation. The high-temperature coolant enters plate heat exchanger 1 7 for heat exchange, and the low-temperature coolant then provides heat to the power battery 35, high-voltage control 24, motor 25, and auxiliary machine 26. 6 provides cooling capacity, thus circulating; after compressor 1 starts, the high-temperature and high-pressure gaseous refrigerant condenses after exchanging heat with the coolant in the heating cooling fluid circuit through water-cooled condenser 2, and the liquid refrigerant enters the liquid storage tank 5. At this time, part of the high-pressure liquid refrigerant enters plate heat exchanger 7 through control valve 8, and evaporates after exchanging heat with the coolant in the large circulation cooling fluid circuit. Another part of the high-pressure liquid refrigerant enters air conditioning evaporator 10 through control valve 29 to dehumidify the passenger compartment. The low-temperature and low-pressure gaseous refrigerant formed in plate heat exchanger 7 and air conditioning evaporator 10 collects and returns to compressor 1 to complete the circulation. At the same time, under the action of air conditioning water pump 17, the coolant in the heating cooling fluid circuit is heated by heat exchange when passing through water-cooled condenser 2, and heats the passenger compartment through the warm air core 15.

[0040] Operating Condition 6: Energy-Saving Mode During Transitional Seasons

[0041] like Figure 7 As shown, under this operating condition, the a and b ports of the three-way water valve 28 are connected, the a and b ports of the four-way water valve 27 are connected, the d and c ports of the four-way water valve 27 are connected, and the a and c ports of the three-way proportional water valve 29 are connected. This connects the battery coolant circuit and the electric drive coolant circuit in series to form a large-circulation coolant circuit. The electric drive water pump 32 and the battery water pump 33 are turned on. The coolant in the large-circulation coolant circuit carries away the heat generated by the power battery 35, high-voltage control 24, motor 25, and auxiliary machine 26 during operation. The high-temperature coolant enters the motor low-temperature water tank 31 to exchange heat with the outside. The low-temperature coolant then provides cooling for the power battery 35, high-voltage control 24, motor 25, and auxiliary machine 26, thus creating a cycle.

[0042] This operating condition occurs during the transitional season between spring and autumn, when the ambient temperature is low (e.g., 10℃). Due to the high load, the power battery 35 needs to dissipate heat. The cooling effect is achieved by directly utilizing the cool air from nature to cool the power battery 35, realizing "zero compressor energy consumption" natural cooling of the internal power battery from an external cold source, thus saving energy.

[0043] Operating Condition 7: Extremely Cold Environment, Electric Driven Thermal Storage Heat Pump Heating Mode

[0044] like Figure 8 As shown, under this operating condition, the a and c ports of the three-way water valve 28 are connected, the a and b ports of the four-way water valve 27 are connected, the c and d ports of the four-way water valve 27 are connected, and the a and b ports of the three-way proportional water valve 29 are connected. Control valve 8, compressor 1, electric water pump 32, and air conditioning water pump 17 are opened. Under the action of electric water pump 32, the coolant carries away the heat generated during the operation of high-pressure control 24, motor 25, and auxiliary machine 26. The high-temperature coolant enters the heat exchange passage of plate heat exchanger 7, providing heat to the liquid refrigerant in the condensation passage of plate heat exchanger 7. The cooled coolant flows through bypass pipe 36 and then enters from port c and exits from port a of the three-way water valve 28. Then, the refrigerant enters from port C and exits from port D of the four-way water valve 27, then enters from port A and exits from port B of the three-way proportional water valve 29, and finally flows back to the electric water pump 32 to complete the large circulation. The liquid refrigerant in the evaporation path of the plate heat exchanger 7 absorbs heat and vaporizes. The low-temperature and low-pressure gaseous refrigerant is compressed by the compressor 1 to form a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant enters the water-cooled condenser 2 to release heat. The liquefied refrigerant enters the liquid storage tank 5 through the bypass pipe 2 13, and enters the evaporation path of the plate heat exchanger 7 through the control valve 8 to complete the circulation. Meanwhile, the coolant in the heating cooling liquid circuit absorbs heat in the water-cooled condenser 2 to achieve heating of the crew cabin.

[0045] Under this operating condition, the path of coolant to power battery 35 is forcibly cut off through bypass pipe 36, preventing the heat accumulated in the electric drive coolant circuit from being absorbed by power battery 35 and thus preventing it from quickly providing heat to refrigerant circuit 1. In addition, under this operating condition, the user can selectively activate electric heater 16 for supplemental heating as needed to meet the heating requirements of the passenger compartment.

[0046] This invention also has other applications, which will not be listed one by one, and can meet the needs of use in all scenarios.

[0047] The detailed description listed above is merely a specific description of feasible embodiments of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A vehicle thermal management system based on multi-channel valve control, characterized in that: The system includes two refrigerant circuits: Refrigerant Circuit 1 and Refrigerant Circuit 2. Refrigerant Circuit 1 includes Compressor 1, which is connected to a water-cooled condenser 1. The water-cooled condenser 1 is connected to an air conditioning heat exchanger, which is connected to an air conditioning evaporator and a plate heat exchanger 1. The air conditioning evaporator and plate heat exchanger 1 are connected in parallel to Compressor 1. Refrigerant Circuit 2 includes Compressor 2, Water-cooled condenser 2, and Plate heat exchanger 2 connected in series. Refrigerant Circuit 1 is coupled to a heating coolant circuit through Water-cooled condenser 1. Refrigerant Circuit 2 is coupled to an electric drive coolant circuit through Water-cooled condenser 2. The electric drive coolant circuit is integrated with a battery coolant circuit via a multi-way valve. The battery coolant circuit includes Plate heat exchanger 1, Battery water pump, Electric heater 1, Power battery, Multi-way valve, and Plate heat exchanger 2 connected in series. The Power battery is connected in parallel to a bypass pipe 1. The bypass pipe 1 and the Power battery are connected in parallel to the electric heater 1 and the multi-way valve, respectively.

2. The vehicle thermal management system based on multi-channel valve control according to claim 1, characterized in that: The air conditioning heat exchanger is connected in parallel with a second bypass pipe. A first shut-off valve is installed on the branch where the air conditioning heat exchanger is located, and a second shut-off valve is installed on the second bypass pipe.

3. The vehicle thermal management system based on multi-channel valve control according to claim 1, characterized in that: The electric drive coolant circuit includes a high-voltage controller, a motor, an auxiliary machine, a multi-way valve, a motor cryogenic water tank, an electric drive water pump, and a water-cooled condenser connected in series. The motor cryogenic water tank is connected in parallel with a bypass pipe, which connects the multi-way valve and the electric drive water pump.

4. The vehicle thermal management system based on multi-channel valve control according to claim 3, characterized in that: The multi-way valve includes a four-way water valve, a three-way water valve one, and a three-way water valve two. The three ports of the three-way water valve one are respectively connected to the four-way water valve, the power battery, and the bypass pipe one. The four ports of the four-way water valve are respectively connected to the auxiliary machine, the plate heat exchanger two, the three-way water valve one, and the three-way water valve two. The three ports of the three-way water valve two are respectively connected to the four-way water valve, the bypass pipe two, and the motor low-temperature water tank.

5. The vehicle thermal management system based on multi-channel valve control according to claim 1, characterized in that: The heating cooling fluid circuit includes an air conditioning water pump, a water-cooled condenser, and a heater core connected in series.

6. The vehicle thermal management system based on multi-channel valve control according to claim 5, characterized in that: The heating cooling fluid circuit also includes an electric heater.

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