R290 heat management system based on secondary loop integrated waste heat utilization

Abstract

The utility model discloses an R290 heat management system based on secondary loop integrated waste heat utilization, relates to the field of electric automobile heat management, and aims to solve the problems that a heat management system in the prior art is high in cost, large in heat transfer loss, incapable of coping with an extremely low temperature environment and insufficient in single-core refrigerating capacity. A six-way water valve and a seven-way water valve are combined with a three-way valve to form a heat management pipeline, the heat management pipeline exchanges heat with an R290 circulation pipeline, a water-cooling condenser and a chiller battery cooler can be fully operated, a system connecting pipeline and a fluid flow direction are flexible and controllable, the control precision is high, a cold air core body and a warm air core body can be connected in series during refrigeration by changing pipeline connection, and the refrigeration efficiency is improved. Therefore, double-core refrigeration is carried out, and the refrigeration capacity is high; by proportionally adjusting the cooling liquid flow of the two loops, accurate temperature control after liquid mixing is realized, temperature impact on the battery is avoided, and the heat exchange efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle thermal management, in particular to an R290 thermal management system based on secondary loop integrated waste heat utilization. Background Technique

[0002] R290 has broad application prospects among alternative refrigerants due to its physical properties similar to those of traditional R134a and R1234yf refrigerants, its compatibility with the hardware of existing thermal management systems, and its better low-temperature performance. However, due to its flammable and explosive characteristics, the filling amount of R290 is limited, and its safety level is A3. Therefore, at present, the refrigerant side is generally modularly integrated, and a secondary loop is connected through a coolant system to indirectly transfer heat to the passenger compartment and other components with thermal management requirements, so as to avoid the refrigerant entering the passenger compartment due to problems such as leakage and improve the safety of the whole vehicle. The secondary loop includes a passenger compartment system, a battery system, and an electric drive and electronic control system. Its working mode and operating efficiency have a direct impact on the thermal management efficiency and ultimately affect the cruising range achievement rate of the whole vehicle.

[0003] Chinese Patent CN119189600A discloses an indirect integrated thermal management system based on R290 refrigerant and its control method. The indirect integrated thermal management system based on R290 refrigerant consists of a refrigerant circuit, a passenger compartment circuit, a battery circuit, an electric drive system circuit, and a radiator circuit; each circuit is connected by a series of pipelines, and coolant flows in the pipelines, and the driving force for the flow is provided by an electronic water pump. The water flow direction is adjusted and distributed by a combination of a series of three-way valves and their switching to meet the temperature requirements under different working conditions. In this technical solution, a four-way valve is used in the refrigerant circuit to confirm the refrigerant flow direction. In the refrigeration working condition, the two plate heat exchangers in the refrigerant circuit respectively realize condensation heat release and evaporation heat absorption. In the heating working condition, the functions of the plate heat exchangers are exchanged. The defect of this mode is that the selection of the two plate heat exchangers needs to simultaneously meet the functions of condensation heat release and evaporation heat absorption, and there is performance redundancy in a single component, which will lead to a larger volume of the component, a larger filling amount of the system, and a higher cost.

[0004] Chinese Patent CN222027174U discloses an indirect heat pump system, which includes a refrigerant circuit and a coolant circuit. The refrigerant circuit includes a compressor, a first heat exchanger, and a combined pipeline. The combined pipeline includes a first pipeline and a second pipeline connected in parallel. The former is provided with a first throttling valve and a second heat exchanger, and the latter is provided with a second throttling valve and a third heat exchanger. In addition, a third throttling valve is provided on the hot gas bypass pipeline. The inlet of the hot gas bypass pipeline is connected to the pipeline between the compressor and the first heat exchanger, and the outlet is connected to the pipeline between the combined pipeline and the compressor. The coolant circuit includes a multi-way valve assembly, a third pipeline, a fourth pipeline, and a fifth pipeline. The third pipeline flows through a first load, the fourth pipeline flows through a second load, and the fifth pipeline flows through the first heat exchanger. Both ends of the third pipeline, the fourth pipeline, and the fifth pipeline are respectively connected to six ports of the multi-way valve assembly, and any two ports of the multi-way valve assembly can be connected. This technical solution covers engine cooling, motor cooling, occupant compartment thermal management, and battery thermal management, and is applicable to range-extended and hybrid vehicle models; on the refrigerant side, two plate heat exchangers, a gas-injected compressor, and a coaxial tube heat exchanger are used, and the system charge is relatively large when using R290 refrigerant; on the water side, a sixteen-way multi-way valve assembly is used to realize the mode switching of the coolant circuit, and it is difficult to achieve precise proportional regulation. Moreover, there is only heat pump working condition thermal management coupling between the battery circuit and the electric drive circuit, and the waste heat recovery method of transferring the electric drive waste heat to the refrigerant side through a plate heat exchanger and then heating the battery is adopted for battery heating, resulting in large heat transfer losses.

[0005] Chinese Patent CN117048287A discloses an electric vehicle thermal management system based on R290. The adopted technical solution is that it includes a power battery, a battery heating film, an electric compressor, a plate heat exchanger, a cooler, an electronic expansion valve, a water pump, a liquid storage tank, a ten-way valve, a front-end heat dissipation module, an HVAC air conditioning assembly, a four-way valve, and a three-way proportional valve. This system can achieve multiple working modes, and through the operation mode of the system, it can meet the heating, cooling, defogging, and defrosting of the electric vehicle occupant compartment, and at the same time, it can also carry out refined management such as motor cooling, waste heat recovery and utilization, and cooling and heating of the power battery. However, when this system is used in the thermal management system of pure electric vehicles, there are problems such as insufficient system heat source, difficult start-up of the heat pump system, and low heating capacity in extremely low temperature conditions; and when the electric drive waste heat is directly used for battery heating, the precise control of its inlet water temperature needs to be achieved by frequent switching of the modes of each valve component, which has a greater impact on the service life of the components.

[0006] Chinese Patent CN118810342A discloses an electric vehicle thermal management system and method based on R290 gas injection and enthalpy increase. The technical solution adopted is that it includes a power battery, a compressor, a heat exchanger, a water-cooled condenser, a first electronic expansion valve, a second electronic expansion valve, a first water pump, a second water pump, a third water pump, a ten-way valve, a low-temperature radiator, an air-conditioning assembly, a first three-way proportional valve, a second three-way proportional valve, a motor, and an electronic controller. In this technical solution, the cold air core body and the warm air core body circuits are in parallel, without a series operation condition, and the refrigeration capacity of a single core body is insufficient in a small space.

[0007] Chinese Patent CN116039334B discloses a range-extended electric vehicle thermal management system and method. The technical solution adopted is that it includes an electric compressor, a heat recovery pipe, an HVAC module, a battery cooler, a condenser, a high-temperature heat exchanger, a warm water pump, a water-water heat exchanger, a liquid heater, a five-way valve A, an engine water pump, a battery circuit liquid pump, a five-way valve B, an electric drive water pump, and a low-temperature radiator. This technical solution is applicable to range-extended electric vehicles, with the engine waste heat providing a heat source, and there is no need to consider the problem of insufficient waste heat at low temperatures. The key is to achieve temperature control of waste heat recovery from the engine and electric drive circuits through flow regulation of the water-water heat exchanger, and solve the problem of temperature impact of high-temperature coolant on the battery. However, for ordinary pure electric vehicles, due to the problem of insufficient waste heat in a low-temperature environment, this technical solution is not applicable. Summary of the Utility Model

[0008] The technical problem to be solved by the present utility model is to overcome the existing defects and provide an R290 thermal management system based on secondary loop integrated waste heat utilization, which can effectively solve the problems in the background technology.

[0009] To achieve the above object, the present utility model discloses an R290 thermal management system based on secondary loop integrated waste heat utilization. The technical solution adopted is that it includes an air-conditioning box, a refrigerant circulation pipeline, and a thermal management pipeline. There are a cold air core body and a warm air core body in the air-conditioning box. The thermal management pipeline is connected to the cold air core body and the warm air core body. The air-conditioning box further includes a blower, and the blower corresponds to the positions of the cold air core body and the warm air core body. Through the blower, the cold or heat generated by the cold air core body and the warm air core body can be blown out. A heat exchanger is installed on the refrigerant circulation pipeline, and the thermal management pipeline is connected to the heat exchanger. The refrigerant circulation pipeline includes an electric compressor. The heat exchanger includes a water-cooled condenser and a chiller battery cooler. The outlet of the electric compressor is connected to the water-cooled condenser, the second electronic expansion valve, and the chiller battery cooler. The outlet of the chiller battery cooler is connected to the inlet of the gas-liquid separator, and the gas outlet of the gas-liquid separator is connected to the inlet of the electric compressor;

[0010] The refrigerant ports of the water-cooled condenser and the chiller battery cooler are respectively connected to the six-way valve and the seven-way valve of the thermal management pipeline, and a cold-using device and the air handling unit are connected between the six-way valve and the seven-way valve.

[0011] Through the combination of the six-way valve and the seven-way valve, the flow direction of the coolant in the cooling pipeline can be changed as needed, so that the water-cooled condenser and the chiller battery cooler can give full play to their functions; the series and parallel switching of the cold air core and the warm air core can be realized. When in parallel, defrosting and demisting can be realized, and when in series, the upper limit of the air-conditioning refrigeration capacity can be improved, solving the problem of insufficient refrigeration capacity of a single core in a small space.

[0012] As a preferred technical solution of the present invention, the refrigerant inlet of the water-cooled condenser is connected to the seven-way valve, and the refrigerant outlet is connected to the six-way valve; the refrigerant inlet of the chiller battery cooler is connected to the six-way valve, and the refrigerant outlet is connected to the seven-way valve.

[0013] As a preferred technical solution of the present invention, the refrigerant outlet of the water-cooled condenser is connected to the first electronic water pump, and the refrigerant inlet of the chiller battery cooler is connected to the second electronic water pump.

[0014] As a preferred technical solution of the present invention, the cold-using device includes a battery liquid cooling plate and an electric drive and electronic control cooling circuit, which are in parallel and are also in parallel with the air handling unit.

[0015] As a preferred technical solution of the present invention, both ends of the cold air core and the warm air core of the air handling unit are connected to the six-way valve and the seven-way valve. A first proportional three-way water valve is also connected between the cold air core and the six-way valve, and a second proportional three-way water valve is between the warm air core and the seven-way valve. The branch nozzles of the first proportional three-way water valve and the branch nozzles of the second proportional three-way water valve are connected.

[0016] As a preferred technical solution of the present invention, the seven-way valve is connected to the battery liquid cooling plate after being connected to the third electronic water pump, and the battery liquid cooling plate is connected to the six-way valve.

[0017] As a preferred technical solution of the present invention, the cold-using device further includes a radiator, an electronic fan is provided at the radiator, the radiator is connected to the electric drive and electronic control cooling circuit after being connected to the third proportional three-way water valve, and the electric drive and electronic control cooling circuit is connected to the six-way valve; the port of the seven-way valve connected to the radiator is also connected to an expansion water kettle, the branch nozzle of the third proportional three-way water valve is connected to the seven-way valve, and the seven-way valve is connected to the radiator and the branch nozzle of the third proportional three-way water valve through different ports.

[0018] As a preferred technical solution of the present utility model, the electric drive and electronic control cooling circuit includes an MCU (micro-control unit) cooler, an OBC (on-board charger) cooler, a DCDC (DC converter) cooler and a drive motor cooler, and the four are connected in sequence through pipelines.

[0019] As a preferred technical solution of the present utility model, the exhaust port of the electric compressor is connected to the first electronic expansion valve and then to the gas-liquid separator. It is considered that the hot gas bypass circuit can cope with extremely low temperature conditions under the heating condition, can expand the operating range of the refrigerant under ultra-low temperature conditions, and can extend the operating temperature of the heat pump condition to -30 °C, greatly improving the heating capacity of the system at low temperatures.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows: by combining the six-way water valve, the seven-way water valve and the three-way valve, the present utility model can adjust the circuit connection and perform mode switching according to the cooling and heating requirements. During the heat exchange process, the refrigerant first exchanges heat with the cooling water in the water-cooled condenser, and then the cooled water is used to supply cooling to the cold-using equipment, avoiding the safety hazard of the combustible problem of R290 to the heat exchange system. Moreover, the cooled water by R290 is directly used to supply cooling to the cold-using equipment, with small heat transfer loss; further, the chiller battery cooler recovers the waste heat from the electric drive and electronic control cooling circuit, and the heater core is connected in parallel with the battery circuit. By adjusting the battery circuit water pump, the low-temperature coolant can be sucked from the outlet of the heater core, and the outlet water temperature of the heater core can be adjusted by the blower speed. This control logic can achieve precise temperature adjustment in a wide temperature range without mode switching, and at the same time make reasonable use of the difference between the higher working temperature range of the heater core and the lower temperature range in the battery liquid cooling plate to increase the outlet water temperature of the water-cooled condenser to a greater extent, and the system efficiency is improved; by the proportional three-way valve and the six-way water valve, the series-parallel relationship between the cold air core and the heater core can be changed, so that cooling or heating can be achieved when connected in parallel, and defrosting and demisting can be achieved when connected in series, which can improve the upper limit of the air-conditioning refrigeration capacity and solve the problem of insufficient refrigeration capacity of a single core in a small space.

[0021] Furthermore, the present utility model connects the battery cooling circuit in parallel with the electric drive and electronic control cooling circuit, and realizes precise temperature control of the mixed liquid by proportionally adjusting the coolant flow rates of the two circuits, avoiding temperature shock to the battery. Since there is no need to use the chiller battery cooler for waste heat recovery by this secondary heat exchange method, the heat exchange efficiency is higher.

[0022] Further, the exhaust port of the electric compressor enters the gas-liquid separator after throttling through the first electronic expansion valve and then returns to the suction port of the compressor; the secondary coolant circuit remains unchanged, which can expand the operating range of the refrigerant under ultra-low temperature conditions, extend the operating temperature of the heat pump condition to -30°C, and greatly improve the heating capacity of the system at low temperatures. Brief Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the present invention;

[0024] Figure 2 It is a schematic diagram of the passenger compartment refrigeration condition cycle of the present invention;

[0025] Figure 3 It is a schematic diagram of the passenger compartment refrigeration and battery refrigeration condition cycles of the present invention;

[0026] Figure 4 It is a schematic diagram of the passenger compartment heating condition cycle of the present invention;

[0027] Figure 5 It is a schematic diagram of the passenger compartment heating and battery heating condition cycles of the present invention;

[0028] Figure 6 It is a schematic diagram of the passenger compartment heating, dehumidifying and defogging condition cycle of the present invention.

[0029] In the figure: 1. Electric compressor; 2. Gas-liquid separator; 3. Water-cooled condenser; 4. Chiller battery cooler; 5. First electronic expansion valve; 6. Second electronic expansion valve; 7. First electronic water pump; 8. Six-way water valve; 9. Second electronic water pump; 10. Battery liquid cooling plate; 11. Third electronic water pump; 12. Seven-way water valve; 13. Air-conditioning box; 14. Cold air core; 15. Blower; 16. Warm air core; 17. First proportional three-way water valve; 18. Second proportional three-way water valve; 19. Expansion water tank; 20. Radiator; 21. Electronic fan; 22. Third proportional three-way water valve; 23. MCU cooler; 24. OBC cooler; 25. DCDC cooler; 26. Drive motor cooler. Detailed Embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Embodiment

[0031] As Figure 1As shown in the figure, the utility model discloses an R290 thermal management system based on secondary circuit integrated waste heat utilization. The technical solution adopted is as follows: it includes a refrigerant circulation pipeline. The refrigerant circulation pipeline includes an electric compressor 1. The outlet of the electric compressor 1 is connected to the first flow channel inlet of a water-cooled condenser 3. The first flow channel outlet of the water-cooled condenser 3 is connected to a second electronic expansion valve 6 and then connected to the first flow channel inlet of a chiller battery cooler 4. The first flow channel outlet of the chiller battery cooler 4 is connected to the inlet of a gas-liquid separator 2. The gas-phase outlet of the gas-liquid separator 2 is connected to the inlet of the electric compressor 1. The liquid-phase outlet is connected to a first electronic expansion valve 5 and then connected to the pipeline between the outlet of the electric compressor 1 and the water-cooled condenser 3. The first electronic expansion valve 5 is a large-diameter electronic expansion valve. Both the water-cooled condenser 3 and the chiller battery cooler 4 are plate heat exchangers.

[0032] The second flow channel outlet of the water-cooled condenser 3 is connected to a first electronic water pump 7 and then connected to the 4# port of a six-way water valve 8. The 5# port of the six-way water valve 8 is connected to one end of a warm air core 16 in an air handling unit 13. The other end of the warm air core 16 is connected to the 3# port of a second proportional three-way water valve 18. The 1# port of the second proportional three-way water valve 18 is connected to the 4# port of a seven-way water valve 12. The 6# port of the six-way water valve 8 is connected to the 3# port of a first proportional three-way water valve 17. The 1# port of the first proportional three-way water valve 17 is connected to one end of a cold air core 14 in the air handling unit 13. The other end of the cold air core 14 is connected to the 3# port of the seven-way water valve 12. The 2# ports of the first proportional three-way water valve 17 and the second proportional three-way water valve 18 are connected. The 2# port of the six-way water valve 8 is connected to a drive motor cooler 26, a DCDC cooler 25, an OBC cooler 24, and an MCU cooler 23 in an electric drive and electronic control cooling circuit. The MCU cooler 23 is connected to the 3# port of a third proportional three-way water valve 22. The 2# port of the third proportional three-way water valve 22 is connected to the 1# port of the seven-way water valve 12. The 1# port of the third proportional three-way water valve 22 is connected to a radiator 20. The radiator 20 is connected to the 7# port of the seven-way water valve 12. An electronic fan 21 is also installed at the radiator 20. The 3# port of the six-way water valve 8 is connected to a second electronic water pump 9 and then connected to the second flow channel inlet of the chiller battery cooler 4. The second flow channel outlet of the chiller battery cooler 4 is connected to the 5# port of the seven-way water valve 12. There is also a blower 15 in the air handling unit 13, opposite to the cold air core 14 and the warm air core 16.

[0033] The 2# port of the seven-way water valve 12 is connected to a third electronic water pump 11 and then connected to one end of a battery liquid cooling plate 10. The other end of the battery liquid cooling plate 10 is connected to the 1# port of the six-way water valve 8. The 6# port of the seven-way water valve 12 is connected to the second flow channel inlet of the water-cooled condenser 3. The 7# port of the seven-way water valve 12 is also connected to an expansion water tank 19.

[0034] It also includes a heat pump air conditioner controller. Temperature sensors and flow sensors are installed at both ends of the electric compressor 1, the battery liquid cooling plate 10, the cold air core 14, the warm air core 16, the radiator 20, the drive motor cooler 26, the DCDC cooler 25, the OBC cooler 24, the MCU cooler 23, and at the two flow channel inlets and outlets of the water-cooled condenser 3 and the chiller battery cooler 4. The temperature sensors, flow sensors, electric compressor 1, the first electronic expansion valve 5, the second electronic expansion valve 6, the first electronic water pump 7, the six-way water valve 8, the second electronic water pump 9, the third electronic water pump 11, the seven-way water valve 12, the blower 15, the first proportional three-way water valve 17, the second proportional three-way water valve 18, and the electronic fan 21 are all electrically connected to the heat pump air conditioner controller.

[0035] The working principle of the present utility model:

[0036] As Figure 2 shown, in the passenger compartment refrigeration condition, the heat pump air conditioner controller controls the six-way water valve 8 to connect the 4# port with the 2# port, and the 3# port with the 5# port, controls the first proportional three-way water valve 17 and the second proportional three-way water valve 18 to connect their 2# ports, controls the seven-way water valve 12 to connect the 3# port with the 5# port, the 6# port with the 7# port, and controls the third proportional three-way water valve 22 to connect its 1# port with the 3# port.

[0037] After the electric compressor 1 compresses the gaseous R290 refrigerant, it is sent into the first flow channel of the water-cooled condenser 3. After cooling down in the water-cooled condenser 3, it expands through the second electronic expansion valve 6 to form a low-temperature gaseous fluid. After passing through the first flow channel of the chiller battery cooler 4, it enters the gas-liquid separator 2 for gas-liquid separation. The gaseous R290 refrigerant enters the electric compressor 1 for re-compression.

[0038] In the second flow channel of the water-cooled condenser 3, the circulating water exchanges heat with the fluid in the first flow channel and is heated up. Then, under the action of the first electronic water pump 7, it is pumped out from the 1# port of the second flow channel of the water-cooled condenser 3, sent into the 4# port of the six-way water valve 8, and then enters the drive motor cooler 26, DCDC cooler 25, OBC cooler 24, and MCU cooler 23 of the electric drive and electronic control cooling circuit through the 2# port. After sufficient heat exchange, it enters the radiator 20 for heat dissipation. The electronic fan 21 blows the heat of the radiator 20 into the external environment of the vehicle body, and then enters the 2# port of the second flow channel of the water-cooled condenser 3 through the 7# port and 6# port of the seven-way water valve 12, and returns to the second flow channel to form a cycle.

[0039] In the second flow channel of the chiller battery cooler 4, after the circulating water exchanges heat with the fluid in the first flow channel and is cooled down, it enters the 5# port of the seven-way water valve 12 from the 2# port of the second flow channel, and then leaves the seven-way water valve 12 from the 3# port. The cold fluid leaving the 3# port of the seven-way water valve 12 enters the cold air core 14, and then enters the warm air core 16 through the first proportional three-way water valve 17 and the second proportional three-way water valve 18, forming a series double-cooling core to ensure sufficient cooling in a small space. After passing through the warm air core 16, it enters the 3# port from the 5# port of the six-way water valve 8, leaves the six-way water valve 8 from the 3# port, and then is pressurized by the second electronic water pump 9 and enters the second flow channel from the 1# port of the second flow channel of the chiller battery cooler 4 to form a cycle. In the air conditioning box 13, the blower 15 blows the cold air of the cold air core 14 and the warm air core 16 into the cockpit to cool the cockpit.

[0040] In this working condition, the cold air core 14 and the warm air core 16 are in series, increasing the heat exchange area, thereby improving the air conditioning refrigeration capacity. In the air conditioning box 13, the air dampers of the cold air core 14 and the warm air core 16 are both opened, and the defrosting and defogging functions of the passenger cabin can be realized.

[0041] As Figure 3 shown, in the passenger cabin refrigeration and battery refrigeration working conditions, based on the passenger cabin refrigeration working condition, the heat pump air conditioning controller controls the six-way water valve 8 to connect the 1# port and the 3# port, and controls the seven-way water valve 12 to connect the 2# port and the 5# port.

[0042] In the second flow channel of the chiller battery cooler 4, after the circulating water exchanges heat with the fluid in the first flow channel and is cooled down, it enters the 5# port of the seven-way water valve 12 from the 2# port of the second flow channel, and then leaves the seven-way water valve 12 from the 2# port and the 3# port respectively. The cold fluid leaving the 2# port enters the battery liquid cooling plate 10 under the boost of the third electronic water pump 11 to cool the battery pack, then enters the 1# port of the six-way water valve 8, leaves the six-way water valve 8 from the 3# port, and then is pressurized by the second electronic water pump 9 and enters the second flow channel from the 1# port of the second flow channel of the chiller battery cooler 4 to form a cycle. The cold fluid leaving the 3# port of the seven-way water valve 12 enters the cold air core 14, and then enters the warm air core 16 through the first proportional three-way water valve 17 and the second proportional three-way water valve 18, forming a series double-cooling core to ensure sufficient cooling in a small space. After passing through the warm air core 16, it enters the 3# port from the 5# port of the six-way water valve 8 and returns. In the air conditioning box 13, the blower 15 blows the cold air of the cold air core 14 and the warm air core 16 into the cockpit to cool the cockpit.

[0043] As Figure 4As shown in the figure, in the heating condition of the cockpit, the heat pump air conditioner controller controls the six-way water valve 8 to connect the 4# port with the 5# port, and the 1# port with the 2# port and the 3# port. It controls the second proportional three-way water valve 18 to connect its 1# port with the 3# port, controls the seven-way water valve 12 to connect the 4# port with the 6# port, and the 1# port and the 5# port with the 2# port, and controls the third proportional three-way water valve 22 to connect its 2# port with the 3# port.

[0044] The circulation of R290 is the same as that in the above-mentioned refrigeration condition.

[0045] In the second flow channel of the water-cooled condenser 3, the circulating water exchanges heat with the fluid in the first flow channel and is heated up. Then, under the action of the first electronic water pump 7, it is pumped out from the second flow channel of the water-cooled condenser 3 and sent to the 4# port of the six-way water valve 8. Then, it enters the warm air core 16 of the air-conditioning box 13 through the 5# port. The blower 15 blows the heat of the warm air core 16 into the cockpit to heat up the cockpit. At the same time, the heat exchange fluid in the warm air core 16 cools down. After passing through the warm air core 16, the heat exchange fluid enters the 4# port of the seven-way water valve 12 through the second proportional three-way water valve 18 and returns to the second flow channel of the water-cooled condenser 3 through the 6# port, forming a cycle.

[0046] In the second flow channel of the chiller battery cooler 4, the circulating water exchanges heat with the fluid in the first flow channel and cools down. Then, it enters the 5# port of the seven-way water valve 12 and leaves the seven-way water valve 12 from the 2# port. The cold fluid leaving from the 2# port enters the battery liquid cooling plate 10 under the boost of the third electronic water pump 11 to cool the battery pack. Then, it enters the 1# port of the six-way water valve 8. In the six-way water valve 8, the cold fluid leaves the three-way water valve 8 through the 2# port and the 3# port respectively. The cold fluid leaving from the 2# port enters the drive motor cooler 26, DCDC cooler 25, OBC cooler 24, and MCU cooler 23 of the electric drive and electronic control cooling circuit. After sufficient heat exchange, it enters the 1# port of the seven-way water valve 12 through the 3# port and the 2# port of the third proportional three-way water valve 22, and then converges with the cold fluid introduced from the 5# port at the 2# port to form a cycle. The cold fluid leaving from the 3# port of the six-way water valve 8 is pressurized by the second electronic water pump 9 and enters the second flow channel of the chiller battery cooler 4 to form a cycle.

[0047] As Figure 5 As shown in the figure, in the heating conditions of the passenger cabin and the battery, the heat pump air conditioner controller controls the six-way water valve 8 to connect the 1# port, 4# port with the 5# port, and the 2# port with the 3# port. It controls the second proportional three-way water valve 18 to connect its 1# port with the 3# port, controls the seven-way water valve 12 to connect the 4# port with the 2# and 6# ports, and the 5# port with the 1# port, and controls the third proportional three-way water valve 22 to connect its 2# port with the 3# port.

[0048] The cycle of R290 is the same as the above refrigeration condition.

[0049] In the second flow channel of the water-cooled condenser 3, after the circulating water exchanges heat with the fluid in the first flow channel and is heated up, it is pumped out from the second flow channel of the water-cooled condenser 3 under the action of the first electronic water pump 7, and sent to the 4# port of the six-way water valve 8, and then enters the warm air core 16 of the air conditioner box 13 through the 5# port. The blower 15 blows the heat of the warm air core 16 into the cockpit to heat up the cockpit. At the same time, the heat exchange fluid in the warm air core 16 is cooled down. After passing through the warm air core 16, the heat exchange fluid enters the 4# port of the seven-way water valve 12 through the second proportional three-way water valve 18, and then leaves the seven-way water valve 12 through the 6# port and the 2# port respectively. The heat exchange fluid leaving the seven-way water valve 12 through the 6# port returns to the second flow channel of the water-cooled condenser 3 to form a cycle; the heat exchange fluid leaving the seven-way water valve 12 through the 2# port enters the battery liquid cooling plate 10 under the boost of the third electronic water pump 11 to heat up the battery pack, and then enters the 1# port of the six-way water valve 8, and then converges with the hot fluid entering from the 4# port at the 5# port to form a cycle.

[0050] In the second flow channel of the Chiller battery cooler 4, after the circulating water exchanges heat with the fluid in the first flow channel and is cooled down, it enters the 5# port of the seven-way water valve 12, and then leaves the seven-way water valve 12 from the 1# port. The cold fluid leaving the 1# port enters the MCU cooler 23, OBC cooler 24, DCDC cooler 25 and drive motor cooler 26 of the electric drive and electronic control cooling circuit through the third proportional three-way water valve 22. After sufficient heat exchange, it enters the six-way water valve 8 through the 2# port of the six-way water valve 8, and then leaves the six-way water valve 8 through the 3# port; the cold fluid leaving the six-way water valve 8 through the 3# port is pressurized by the second electronic water pump 9 and enters the second flow channel of the Chiller battery cooler 4 to form a cycle.

[0051] In another extremely low temperature condition of this working condition, in the refrigerant circuit, there is a compressor hot gas bypass circuit. The compressor discharge port throttles through the first electronic expansion valve 5 (the first electronic expansion valve 5 uses a large-diameter electronic expansion valve) and enters the gas-liquid separator, and then returns to the compressor suction port; the secondary coolant circuit remains unchanged. This circuit can expand the operating range of the refrigerant under ultra-low temperature conditions, and can extend the operating temperature of the heat pump working condition to -30°C, greatly improving the heating capacity of the system at low temperatures.

[0052] As Figure 6As shown in the figure, under the heating, dehumidifying and defogging conditions of the passenger cabin, the heat pump air conditioner controller controls the six-way water valve 8 to connect the 1# port, 4# port and 5# port, and connect the 6# port and 3# port. It controls the first proportional three-way water valve 17 to connect its 1# port and 3# port, controls the second proportional three-way water valve 18 to connect its 1# port and 3# port, and controls the seven-way water valve 12 to connect the 4# port with the 2# and 6# ports, and the 5# port with the 3# port.

[0053] The circulation of R290 is the same as that in the above refrigeration condition.

[0054] In the second flow channel of the water-cooled condenser 3, the circulating water exchanges heat with the fluid in the first flow channel and is heated. Then, under the action of the first electronic water pump 7, it is drawn out from the second flow channel of the water-cooled condenser 3 and sent to the 4# port of the six-way water valve 8. Then it enters the warm air core 16 of the air conditioner box 13 through the 5# port. At the same time, the heat exchange fluid in the warm air core 16 cools down. After passing through the warm air core 16, the heat exchange fluid enters the 4# port of the seven-way water valve 12 through the second proportional three-way water valve 18, and then leaves the seven-way water valve 12 through the 6# port and 2# port respectively. The heat exchange fluid leaving the seven-way water valve 12 through the 6# port returns to the second flow channel of the water-cooled condenser 3 to form a cycle; the heat exchange fluid leaving the seven-way water valve 12 through the 2# port enters the battery liquid cooling plate 10 under the boost of the third electronic water pump 11 to heat the battery pack, then enters the 1# port of the six-way water valve 8, and then converges with the hot fluid entering from the 4# port at the 5# port to form a cycle.

[0055] In the second flow channel of the chiller battery cooler 4, the circulating water exchanges heat with the fluid in the first flow channel and cools down, then enters the 5# port of the seven-way water valve 12, and then leaves the seven-way water valve 12 from the 3# port. The cold fluid leaving from the 3# port passes through the cold air core 14 and the first proportional three-way water valve 17, then enters the six-way water valve 8 through the 6# port of the six-way water valve 8, and then leaves the six-way water valve 8 through the 3# port; the cold fluid leaving the six-way water valve 8 through the 3# port is pressurized by the second electronic water pump 9 and enters the second flow channel of the chiller battery cooler 4 to form a cycle.

[0056] The blower 15 blows the heat of the warm air core 16 and the cold of the cold air core 14 into the cockpit to defog and dehumidify the cockpit.

[0057] The circuits and mechanical connections involved in the present invention are common means adopted by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments, which belong to well-known common knowledge.

[0058] The components not described in detail herein, including the six-way water valve 8 and the seven-way water valve 12, are prior art.

[0059] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An R290 thermal management system based on integrated waste heat utilization of the secondary circuit, comprising an air handling unit (13), a refrigerant circulation pipeline, and a thermal management pipeline. There is a cold air core (14) and a warm air core (16) in the air handling unit (13). The thermal management pipeline is connected to the cold air core (14) and the warm air core (16). The air handling unit (13) further includes a blower (15), and the blower (15) corresponds to the positions of the cold air core (14) and the warm air core (16). Through the blower (15), the cold or heat generated by the cold air core (14) and the warm air core (16) can be blown out. A heat exchanger is installed on the refrigerant circulation pipeline, and the thermal management pipeline is connected to the heat exchanger. It is characterized in that: The refrigerant circulation pipeline includes an electric compressor (1). The heat exchanger includes a water-cooled condenser (3) and a chiller battery cooler (4). The outlet of the electric compressor (1) is connected to the water-cooled condenser (3), a second electronic expansion valve (6), and the chiller battery cooler (4). The outlet of the chiller battery cooler (4) is connected to the inlet of the gas-liquid separator (2), and the gas outlet of the gas-liquid separator (2) is connected to the inlet of the electric compressor (1). The refrigerant ports of the water-cooled condenser (3) and the chiller battery cooler (4) are respectively connected to a six-way water valve (8) and a seven-way water valve (12) of the thermal management pipeline. A cold-using device and the air handling unit (13) are connected between the six-way water valve (8) and the seven-way water valve (12).

2. The R290 thermal management system based on secondary circuit integrated waste heat utilization according to claim 1, wherein: The refrigerant inlet of the water-cooled condenser (3) is connected to the seven-way water valve (12), and the refrigerant outlet is connected to the six-way water valve (8). The refrigerant inlet of the chiller battery cooler (4) is connected to the six-way water valve (8), and the refrigerant outlet is connected to the seven-way water valve (12).

3. The R290 thermal management system based on integrated waste heat utilization of the secondary circuit according to claim 2, wherein: The refrigerant outlet of the water-cooled condenser (3) is connected to a first electronic water pump (7), and the refrigerant inlet of the chiller battery cooler (4) is connected to a second electronic water pump (9).

4. The R290 thermal management system based on secondary circuit integrated waste heat utilization according to claim 1, wherein: The cold-using device includes a battery liquid cooling plate (10) and an electric drive and electronic control cooling circuit, which are in parallel and in parallel with the air handling unit (13).

5. The R290 thermal management system based on secondary circuit integrated waste heat utilization according to claim 4, characterized in that: Both ends of the cold air core body (14) and the warm air core body (16) of the air handling unit (13) are connected to the six-way water valve (8) and the seven-way water valve (12). A first proportional three-way water valve (17) is also connected between the cold air core body (14) and the six-way water valve (8). There is a second proportional three-way water valve (18) between the warm air core body (16) and the seven-way water valve (12). The branch ports of the first proportional three-way water valve (17) and the branch ports of the second proportional three-way water valve (18) are connected.

6. The R290 thermal management system based on integrated waste heat utilization of the secondary circuit according to claim 4, characterized in that: The seven-way water valve (12) is connected to a third electronic water pump (11) and then connected to the battery liquid cooling plate (10), and the battery liquid cooling plate (10) is connected to the six-way water valve (8).

7. The R290 thermal management system based on integrated waste heat utilization of the secondary circuit according to claim 4, characterized in that: The cold-using device also includes a radiator (20). There is an electronic fan (21) at the radiator (20). The radiator (20) is connected to a third proportional three-way water valve (22) and then connected to the electric drive and electronic control cooling circuit, and the electric drive and electronic control cooling circuit is connected to the six-way water valve (8). The port of the seven-way water valve (12) connected to the radiator (20) is also connected to an expansion water tank (19). The branch port of the third proportional three-way water valve (22) is connected to the seven-way water valve (12). The seven-way water valve (12) is connected to the radiator (20) and the branch port of the third proportional three-way water valve (22) through different ports.

8. The R290 thermal management system based on secondary circuit integrated waste heat utilization according to claim 7, characterized in that: The electric drive and electronic control cooling circuit includes an MCU cooler (23), an OBC cooler (24), a DCDC cooler (25), and a drive motor cooler (26), and the four are connected in sequence through pipelines.

9. The R290 thermal management system based on secondary circuit integrated waste heat utilization according to claim 1, characterized in that: The exhaust port of the electric compressor (1) is connected to the first electronic expansion valve (5) and then to the gas-liquid separator (2).

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