Pure electric new energy vehicle thermal management system based on R290 refrigerant

Abstract

The invention relates to the technical field of vehicle thermal management, in particular to a pure electric new energy vehicle thermal management system based on an R290 refrigerant. Comprising a refrigerant module, the refrigerant module comprises a gas-liquid separation device, a compressor, a four-way valve, a first liquid heat exchanger, a second liquid heat exchanger, a third liquid heat exchanger, a first electronic expansion valve and a second electronic expansion valve, the top end of the four-way valve is connected with the compressor through a pipeline, and one end of the compressor is connected with the gas-liquid separation device; one end of the gas-liquid separation device is connected with one end of the four-way valve, and the end, away from the gas-liquid separation device, of the four-way valve is connected with the first liquid heat exchanger. According to the pure electric new energy automobile heat management system based on the R290 refrigerant, through heat management of a power battery, a passenger compartment and a motor of a pure electric new energy automobile, switching of multiple refrigeration modes can be achieved at the high temperature, waste heat of all parts can be fully recycled at the low temperature, the situation of energy waste is avoided, and the service life of the pure electric new energy automobile is prolonged. And the energy use efficiency of the automobile is further improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle thermal management technology, and in particular to a thermal management system for a pure electric new energy vehicle based on R290 refrigerant. Background Art

[0002] The refrigerant commonly used in automotive air conditioners is R134a, which has a GWP (global warming potential) of 1300 and is a greenhouse gas. At the same time, when R134a is used as a medium in the heat pump air conditioner of new energy vehicles, its low-temperature performance is poor and its applicability is poor. When used in an environment below -10°C, the efficiency is low and the system is unstable. It is particularly dependent on the heating device PTC for assistance, which leads to high low-temperature energy consumption and the problem of endurance attenuation in low-temperature environments. Therefore, it is necessary to find a refrigerant with a low GWP value and high thermal properties to replace it. Compared with R134a, R290 refrigerant has better cooling efficiency, especially under ultra-low temperature (-20°C) conditions, it still has considerable heating capacity. In order to reduce air conditioning energy consumption, especially heating energy consumption, current pure electric new energy vehicles often set up complex heat pump circuits to recover waste heat from motors and batteries. R290 refrigerant is flammable and explosive. If R290 refrigerant is directly used to replace common refrigerants in complex heat pump circuits, it will have great safety hazards due to the large amount of refrigerant added. Therefore, a thermal management system that can apply R290 refrigerant is urgently needed.

[0003] To this end, a pure electric new energy vehicle thermal management system based on R290 refrigerant is designed to provide another technical solution to the above technical problems. Summary of the invention

[0004] Based on this, it is necessary to provide a pure electric new energy vehicle thermal management system based on R290 refrigerant to solve the technical problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A pure electric new energy vehicle thermal management system based on R290 refrigerant includes a refrigerant module, the refrigerant module includes a gas-liquid separation device, a compressor, a four-way valve, a first liquid heat exchanger, a second liquid heat exchanger, a third liquid heat exchanger, a first electronic expansion valve and a second electronic expansion valve. The top of the four-way valve is connected to the compressor through a pipeline, one end of the compressor is connected to the gas-liquid separation device, one end of the gas-liquid separation device is connected to one end of the four-way valve, and the end of the four-way valve away from the gas-liquid separation device is connected to the first liquid heat exchanger. The bottom of the first liquid heat exchanger is respectively connected to the first electronic expansion valve and the second electronic expansion valve through pipelines, the bottom of the four-way valve is connected to the third liquid heat exchanger, and the bottom of the third liquid heat exchanger is connected to the second electronic expansion valve; the bottom of the four-way valve is also connected to the second liquid heat exchanger, a fourth temperature sensor is connected between the four-way valve and the second liquid heat exchanger, and the bottom of the second liquid heat exchanger is connected to the first electronic expansion valve.

[0007] As a preferred implementation of the pure electric new energy vehicle thermal management system based on R290 refrigerant provided by the present invention, R290 refrigerant is used as the medium in the refrigerant module.

[0008] As a preferred implementation of the pure electric new energy vehicle thermal management system based on R290 refrigerant provided by the present invention, a temperature and pressure sensor is also connected between the top of the four-way valve and the compressor; a fifth temperature sensor is also connected between the four-way valve and the third liquid heat exchanger.

[0009] As a preferred embodiment of the thermal management system for a pure electric new energy vehicle based on R290 refrigerant provided by the present invention, the outer sides of the four-way valve are respectively provided with connection ports 1, 2, 3 and 4, the connection port 1 on the four-way valve is connected to the compressor, the connection port 4 on the four-way valve is connected to the gas-liquid separation device, the connection port 3 on the four-way valve is connected to the third liquid heat exchanger, the connection port 3 on the four-way valve is also connected to the second liquid heat exchanger, and the connection port 4 on the four-way valve is connected to the gas-liquid separation device.

[0010] As a preferred embodiment of the pure electric new energy vehicle thermal management system based on R290 refrigerant provided by the present invention, the medium flows through the compressor, the connection port 1 in the four-way valve to the connection port 2, the first liquid heat exchanger, the first electronic expansion valve, the second electronic expansion valve, the second liquid heat exchanger, the third liquid heat exchanger, the connection port 3 in the four-way valve to the connection port 4, the gas-liquid separation device, and returns to the compressor to form a refrigeration circuit of the refrigerant module;

[0011] According to the flow direction of the medium, it passes through the compressor, connection port 1 in the four-way valve to connection port 3, the second liquid heat exchanger, the third liquid heat exchanger, the first liquid heat exchanger, connection port 2 in the four-way valve to connection port 4, the gas-liquid separation device, and returns to the compressor to form a heating circuit of the refrigerant module.

[0012] As a preferred embodiment of the pure electric new energy vehicle thermal management system based on R290 refrigerant provided by the present invention, it also includes an eight-way valve, one end of the eight-way valve is connected to a first water pump, one end of the first water pump is connected to a first expansion water tank, the first expansion water tank is connected to the eight-way valve, the bottom of one end of the eight-way valve is connected to a second external heat exchanger, the bottom of the second external heat exchanger is provided with an electronic fan, one end of the second external heat exchanger is connected to a third water pump, one end of the third water pump is connected to a third expansion water tank, the third expansion water tank is connected to the eight-way valve, the top of the second external heat exchanger is provided with the first external heat exchanger, one end of the first external heat exchanger is connected to one end of the top of the first liquid heat exchanger, one end of the bottom of the first liquid heat exchanger is connected to the second expansion water tank, one end of the second expansion water tank is connected to the second water pump, the second water pump is connected to the first external heat exchanger, the eight-way valve One end of the bottom of the valve is connected to the passenger compartment / PTC module, one end of the passenger compartment / PTC module is connected to a five-way valve, one end of the five-way valve is connected to one end of the top of the second liquid heat exchanger, one end of the bottom of the second liquid heat exchanger is connected to the eight-way valve, the other end of the five-way valve is connected to the pipeline between the second liquid heat exchanger and the eight-way valve, the other end of the eight-way valve is connected to the bottom of a power battery module, one end of the power battery module is connected to one end of the top of the third liquid heat exchanger, and a second temperature sensor is also connected between the power battery module and one end of the top of the third liquid heat exchanger, the other end of the eight-way valve is connected to the top of a motor module, a motor fan is arranged at the bottom of the motor module, one end of the motor module is connected to one end of the bottom of the third liquid heat exchanger, one end of the bottom of the five-way valve is connected between the motor module and the third liquid heat exchanger, and the other end of the bottom of the five-way valve is connected between the motor module and the eight-way valve.

[0013] As a preferred implementation of the pure electric new energy vehicle thermal management system based on R290 refrigerant provided by the present invention, a third temperature sensor is also connected between the passenger compartment / PTC module and the five-way valve.

[0014] As a preferred embodiment of the thermal management system of a pure electric new energy vehicle based on R290 refrigerant provided by the present invention, the outer side of the eight-way valve is respectively provided with connection port 1, connection port 2, connection port 3, connection port 4, connection port 5, connection port 6, connection port 7 and connection port 8, the connection port 1 on the eight-way valve is connected to the third expansion water tank, the connection port 2 on the eight-way valve is connected to the first expansion water tank, the connection port 3 on the eight-way valve is connected to the first water pump, the connection port 4 on the eight-way valve is connected to the second external heat exchanger, the connection port 5 on the eight-way valve is connected to the passenger compartment / PTC module, one end of the bottom of the second liquid heat exchanger is connected to the connection port 6 on the eight-way valve, the connection port 7 on the eight-way valve is connected to the power battery module, and the connection port 8 on the eight-way valve is connected to the motor module.

[0015] As a preferred embodiment of the thermal management system of a pure electric new energy vehicle based on R290 refrigerant provided by the present invention, the outer side of the five-way valve is respectively provided with connection port 1, connection port 2, connection port 3, connection port 4 and connection port 5, the connection port 1 on the five-way valve is connected to the passenger compartment / PTC module, the connection port 2 on the five-way valve is connected to the second liquid heat exchanger, the connection port 3 on the five-way valve is connected between the motor and the third liquid heat exchanger, the connection port 4 on the five-way valve is connected between the motor and the eight-way valve, and the connection port 5 on the five-way valve is connected to the pipeline between the second liquid heat exchanger and the eight-way valve.

[0016] As a preferred embodiment of the thermal management system of a pure electric new energy vehicle based on R290 refrigerant provided by the present invention, the medium flows through the first water pump, the connection port 3 in the eight-way valve flows to the connection port 5, the passenger compartment / PTC module, the connection port 1 in the five-way valve flows to the connection port 2, the second liquid heat exchanger, the connection port 6 in the eight-way valve flows to the connection port 2, the first expansion water tank, and returns to the first water pump to form a passenger compartment air conditioning thermal management loop;

[0017] According to the flow direction of the medium, the medium flows through the first water pump, the connection port 3 in the eight-way valve to the connection port 7, the power battery module, the third liquid heat exchanger, the connection port 3 in the five-way valve to the connection port 4, the connection port 8 in the eight-way valve to the connection port 2, the first expansion water tank, and returns to the first water pump to form a battery thermal management loop;

[0018] According to the medium flow direction, it flows through the third water pump, the second off-board heat exchanger, the connection port 4 in the eight-way valve to the connection port 7, the power battery module, the third liquid heat exchanger, the motor module, the connection port 8 in the eight-way valve to the connection port 1, the third expansion water tank, and returns to the third water pump to form a battery motor thermal management loop;

[0019] According to the flow direction of the medium, the medium passes through the second water pump, the first off-vehicle heat exchanger, the first liquid heat exchanger, the second expansion water tank, and returns to the second water pump to form an off-vehicle heat exchange loop;

[0020] The medium flows through the motor fan, the motor module, the electronic fan, the first off-vehicle heat exchanger, and the second off-vehicle heat exchanger and blows to the outside of the vehicle to form a motor air cooling route.

[0021] It can be seen without a doubt that the above-mentioned technical solution of the present application can definitely solve the technical problem to be solved by the present application.

[0022] At the same time, through the above technical solutions, the present invention has at least the following beneficial effects:

[0023] 1. The present invention provides a thermal management system for pure electric new energy vehicles based on R290 refrigerant. Through the thermal management of the power battery, passenger compartment and motor of the pure electric new energy vehicle, it can realize the switching of multiple cooling modes at high temperatures, and can fully recover the waste heat of each part at low temperatures, thereby avoiding energy waste and improving the energy utilization efficiency of the vehicle.

[0024] 2. Under the premise of ensuring the thermal management of each system, the present invention reasonably uses PTC to overcome the problem of low efficiency of the heat pump system of pure electric vehicles under cold conditions. At the same time, the refrigerant circuit is integrated to achieve effective detection and processing of R290 leakage, improve the explosion-proof performance of the thermal management system, and improve the safety of automobile use, which is conducive to the use of R290 in the automotive thermal management system.

[0025] 3. The present invention integrates the thermal management circuit by using an eight-way valve and a five-way valve, thereby saving the amount of coolant used, reducing the cost of pipeline layout, and facilitating the miniaturization of thermal management.

[0026] 4. The present invention blows the motor waste heat to the vehicle exterior heat exchanger at low temperature, which is beneficial to the recovery of the motor waste heat and can also prevent the vehicle exterior heat exchanger from frosting.

[0027] 5. The present invention utilizes multiple high-precision temperature sensors to monitor each module of the automobile in real time, and feeds the results back to the control system, thereby achieving precise control of the temperature of each module when the automobile is running, avoiding energy waste, and also increasing the service life of the automobile power battery.

[0028] 6. The present invention can achieve cooling of the passenger compartment and the power battery at high temperatures and heating at low temperatures by effectively arranging the pipes, realize effective heat dissipation of the motor in a high temperature environment and recovery of the motor waste heat in a low temperature environment, so as to improve the economy of the pure electric vehicle.

[0029] 7. The present invention adopts an eight-way valve and a five-way valve to form a highly integrated thermal management system for the water cooling circuit. While optimizing the structure of the water pump layout, it also takes into account the utilization of motor waste heat, PTC auxiliary heating, and the use of an eight-way valve and a five-way valve, thereby realizing the switching of multiple control modes, simplifying the thermal management system of the whole vehicle, and ensuring the economy of the whole vehicle.

[0030] 8. The present invention utilizes a plurality of high-precision temperature sensors to monitor each module of the automobile in real time and feeds the results back to the control system, thereby realizing a thermal management system for accurately controlling the temperature of each module when the automobile is running; it solves the problem of poor temperature control accuracy in current automobile thermal management, avoids the waste of automobile energy, can increase the automobile mileage, and can also increase the service life of the automobile power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is the overall architecture diagram of the R290 vehicle thermal management model of the present invention;

[0033] Figure 2 This is a high temperature refrigeration working condition mode diagram of the present invention;

[0034] Figure 3 This is a low temperature heating working condition mode diagram of the present invention;

[0035] Figure 4 It is a schematic diagram of the defrosting mode of the present invention;

[0036] Figure 5 This is a schematic diagram of the heat pump and motor waste heat heating of the present invention;

[0037] Figure 6 It is a schematic diagram of the battery external circulation, passenger compartment refrigerant water cooling, and motor air cooling of the present invention;

[0038] Figure 7 It is a schematic diagram of water cooling of the battery cabin and air cooling of the motor of the present invention;

[0039] Figure 8 This is a schematic diagram of the PTC auxiliary heating of the battery according to the present invention;

[0040] Fig. 9 It is a schematic diagram of heat pump heating of the present invention;

[0041] Fig.10It is a schematic diagram of water cooling of the battery cabin and the motor according to the present invention;

[0042] Fig.11 It is a schematic diagram of PTC and motor waste heat heating of the present invention;

[0043] Fig.12 It is a schematic diagram of cooling the external radiator of the battery motor for cooling the refrigerant in the passenger compartment of the present invention.

[0044] In the figure: 1. eight-way valve; 2. first water pump; 3. first expansion water tank; 4. second expansion water tank; 5. gas-liquid separation device; 6. second water pump; 7. compressor; 8. first external heat exchanger; 9. second external heat exchanger; 10. five-way valve; 11. four-way valve; 12. first liquid heat exchanger; 13. second liquid heat exchanger; 14. third liquid heat exchanger; 15. first electronic expansion valve; 16. second electronic expansion valve; 17. electronic fan; 18. motor fan; 19. first temperature sensor; 20. second temperature sensor; 21. third temperature sensor; 22. fourth temperature sensor; 23. fifth temperature sensor; 24. temperature and pressure sensor; 25. third expansion water tank; 26. third water pump. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0046] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0047] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0048] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0049] Reference Figure 1-Figure 12A pure electric new energy vehicle thermal management system based on R290 refrigerant includes a refrigerant module, in which R290 refrigerant is used as a medium. The refrigerant module includes a gas-liquid separation device 5, a compressor 7, a four-way valve 11, a first liquid heat exchanger 12, a second liquid heat exchanger 13, a third liquid heat exchanger 14, a first electronic expansion valve 15 and a second electronic expansion valve 16. The outer side of the four-way valve 11 is respectively provided with a connection port 1, a connection port 2, a connection port 3 and a connection port 4. The top of the four-way valve 11 is connected to the compressor 7 through a pipeline, so that the connection port 1 on the four-way valve 11 is connected to the compressor 7. A temperature and pressure sensor 24 is also connected between the top of the four-way valve 11 and the compressor 7, so that the temperature and pressure of the four-way valve 11 are measured by the temperature sensor 24. The pressure sensor 24 detects the temperature and pressure of the refrigerant medium in the pipeline between the top of the four-way valve 11 and the compressor 7. One end of the compressor 7 is connected to the gas-liquid separation device 5, and one end of the gas-liquid separation device 5 is connected to one end of the four-way valve 11, so that the connection port 4 on the four-way valve 11 is connected to the gas-liquid separation device 5, so that the medium can flow inside the four-way valve 11 through the connection port 1 and the connection port 4. The end of the four-way valve 11 away from the gas-liquid separation device 5 is connected to the first liquid heat exchanger 12, so that the connection port 2 on the four-way valve 11 is connected to the first liquid heat exchanger 12, and the bottom of the first liquid heat exchanger 12 is respectively connected to the first electronic expansion valve 15 and the second electronic expansion valve 16 through pipelines;

[0050] The bottom of the four-way valve 11 is connected to the third liquid heat exchanger 14, so that the connection port 3 on the four-way valve 11 is connected to the third liquid heat exchanger 14, and a fifth temperature sensor 23 is also connected between the four-way valve 11 and the third liquid heat exchanger 14, so that the temperature of the medium circulating inside the pipeline is detected by the fifth temperature sensor 23, and the bottom of the third liquid heat exchanger 14 is connected to the second electronic expansion valve 16; the bottom of the four-way valve 11 is also connected to the second liquid heat exchanger 13, so that the connection port 3 on the four-way valve 11 is also connected to the second liquid heat exchanger 13, and a fourth temperature sensor 22 is connected between the four-way valve 11 and the second liquid heat exchanger 13, so that the temperature of the medium circulating inside the pipeline is detected by the fourth temperature sensor 22, and the bottom of the second liquid heat exchanger 13 is connected to the first electronic expansion valve 15;

[0051] Preferably, the medium flows through the compressor 7, the connection port 1 in the four-way valve 11 to the connection port 2, the first liquid heat exchanger 12, the first electronic expansion valve 15, the second electronic expansion valve 16, the second liquid heat exchanger 13, the third liquid heat exchanger 14, the connection port 3 in the four-way valve 11 to the connection port 4, the gas-liquid separation device 5, and returns to the compressor 7 to form a refrigeration circuit of the refrigerant module;

[0052] Preferably, the medium flows in the direction through the compressor 7, the connection port 1 in the four-way valve 11 to the connection port 3, the second liquid heat exchanger 13, the third liquid heat exchanger 14, the first liquid heat exchanger 12, the connection port 2 in the four-way valve 11 to the connection port 4, the gas-liquid separation device 5, and returns to the compressor 7 to form a heating circuit of the refrigerant module.

[0053] It also includes an eight-way valve 1, and the outer side of the eight-way valve 1 is respectively provided with a connection port 1, a connection port 2, a connection port 3, a connection port 4, a connection port 5, a connection port 6, a connection port 7 and a connection port 8, one end of the eight-way valve 1 is connected to a first water pump 2, so that the connection port 3 on the eight-way valve 1 is connected to the first water pump 2, one end of the first water pump 2 is connected to a first expansion water tank 3, and the first expansion water tank 3 is connected to the eight-way valve 1, so that the connection port 2 on the eight-way valve 1 is connected to the first expansion water tank 3, and one end of the eight-way valve 1 The bottom of the second vehicle exterior heat exchanger 9 is connected to the second vehicle exterior heat exchanger 9, so that the connection port 4 on the eight-way valve 1 is connected to the second vehicle exterior heat exchanger 9, and the bottom of the second vehicle exterior heat exchanger 9 is provided with an electronic fan 17, so that heat dissipation is achieved through the operation of the electronic fan 17, one end of the second vehicle exterior heat exchanger 9 is connected to the third water pump 26, one end of the third water pump 26 is connected to the third expansion water tank 25, and the third expansion water tank 25 is connected to the eight-way valve 1, so that the connection port 1 on the eight-way valve 1 is connected to the third expansion water tank 25;

[0054] The first off-vehicle heat exchanger 8 is disposed on the top of the second off-vehicle heat exchanger 9, one end of the first off-vehicle heat exchanger 8 is connected to one end of the top of the first liquid heat exchanger 12, one end of the bottom of the first liquid heat exchanger 12 is connected to the second expansion water tank 4, one end of the second expansion water tank 4 is connected to the second water pump 6, and the second water pump 6 is connected to the first off-vehicle heat exchanger 8, so as to form a medium flow loop;

[0055] One end of the bottom of the eight-way valve 1 is connected to the passenger compartment / PTC module, so that the connection port 5 on the eight-way valve 1 is connected to the passenger compartment / PTC module, one end of the passenger compartment / PTC module is connected to the five-way valve 10, and the outer side of the five-way valve 10 is respectively provided with connection ports 1, 2, 3, 4 and 5, the connection port 1 on the five-way valve 10 is connected to the passenger compartment / PTC module, and a third temperature sensor 21 is also connected between the passenger compartment / PTC module and the five-way valve 10, so that the temperature inside the pipeline can be measured by the third temperature sensor 21. The medium temperature is detected, one end of the five-way valve 10 is connected to one end of the top of the second liquid heat exchanger 13, so that the connection port 2 on the five-way valve 10 is connected to the second liquid heat exchanger 13, and one end of the bottom of the second liquid heat exchanger 13 is connected to the eight-way valve 1, so that one end of the bottom of the second liquid heat exchanger 13 is connected to the connection port 6 on the eight-way valve 1; the other end of the five-way valve 10 is connected to the pipeline between the second liquid heat exchanger 13 and the eight-way valve 1, so that the connection port 5 on the five-way valve 10 is connected to the pipeline between the second liquid heat exchanger 13 and the eight-way valve 1;

[0056] A power battery module is connected to the bottom of the other end of the eight-way valve 1, so that the connection port 7 on the eight-way valve 1 is connected to the power battery module, one end of the power battery module is connected to one end of the top of the third liquid heat exchanger 14, and a second temperature sensor 20 is also connected between the power battery module and one end of the top of the third liquid heat exchanger 14, so that the medium temperature inside the pipeline is detected by the second temperature sensor 20, and a motor module is connected to the top of the other end of the eight-way valve 1, so that the connection port 8 on the eight-way valve 1 is connected to the motor module, and a motor fan 18 is provided at the bottom of the motor module, and the motor module is cooled by the operation of the motor fan 18; at the same time, the top of the motor module is connected to the electronic fan 17;

[0057] One end of the motor module is connected to one end of the bottom of the third liquid heat exchanger 14, and one end of the bottom of the five-way valve 10 is connected between the motor module and the third liquid heat exchanger 14, so that the connecting port 3 on the five-way valve 10 is connected between the motor and the third liquid heat exchanger 14, and the other end of the bottom of the five-way valve 10 is connected between the motor module and the eight-way valve 1, so that the connecting port 4 on the five-way valve 10 is connected between the motor and the eight-way valve 1.

[0058] Preferably, the medium flows in the direction through the first water pump 2, the connection port 3 in the eight-way valve 1 to the connection port 5, the passenger compartment / PTC module, the connection port 1 in the five-way valve 10 to the connection port 2, the second liquid heat exchanger 13, the connection port 6 in the eight-way valve 1 to the connection port 2, the first expansion water tank 3, and returns to the first water pump 2 to form a passenger compartment air conditioning thermal management circuit.

[0059] Preferably, the medium flows in the direction through the first water pump 2, the connection port 3 in the eight-way valve 1 to the connection port 7, the power battery module, the third liquid heat exchanger 14, the connection port 3 in the five-way valve 10 to the connection port 4, the connection port 8 in the eight-way valve 1 to the connection port 2, the first expansion water tank 3, and returns to the first water pump 2 to form a battery thermal management circuit.

[0060] Preferably, the medium flows through the third water pump 26, the second external heat exchanger 9, the connection port 4 in the eight-way valve 1 to the connection port 7, the power battery module, the third liquid heat exchanger 14, the motor module, the connection port 8 in the eight-way valve 1 to the connection port 1, the third expansion water tank 25, and returns to the third water pump 26 to form a battery motor thermal management loop.

[0061] Preferably, the medium flows through the second water pump 6, the first off-vehicle heat exchanger 8, the first liquid heat exchanger 12, the second expansion water tank 4, and returns to the second water pump 6 to form an off-vehicle heat exchange circuit.

[0062] Preferably, the medium flows through the motor fan 18, the motor module, the electronic fan 17, the first external heat exchanger 8, and the second external heat exchanger 9 to the outside of the vehicle to form a motor air cooling route.

[0063] When in use, the above modes can be switched through the joint control of the eight-way valve 1 and the five-way valve 10, and the four-way valve 11 can realize the cooling and heating functions. A bypass structure is set inside the passenger compartment / PTC module and the power battery module to effectively control the flow of the refrigerant flowing through the inside, and a switch control valve is set inside the motor module to effectively control the on and off of the coolant in the motor module.

[0064] At the same time, the first liquid heat exchanger 12 can realize heat exchange between the refrigerant module circuit and the external heat exchange circuit, the second liquid heat exchanger 13 can realize heat exchange between the refrigerant module circuit and the passenger compartment air-conditioning thermal management circuit, and the third liquid heat exchanger 14 can realize heat exchange between the refrigerant circuit and the battery thermal management circuit, thereby realizing the air-conditioning system to control the temperature of the battery module and the passenger compartment module.

[0065] Furthermore, taking full account of the advantages and disadvantages of the pure electric vehicle battery heat pump system and the liquid cooling system when the ambient temperature is extreme, a PTC module is used to achieve auxiliary heating. The PTC module is integrated in the passenger compartment module, and auxiliary heating is achieved by heating the refrigerant. The passenger compartment is heated by blowing hot air into the passenger compartment through the blower in the vehicle, and heat is supplied to the power battery module through the five-way valve 10 to ensure the normal function of the power battery module in an ultra-low temperature environment and to increase the service life of the power battery module.

[0066] In this embodiment, the top, bottom, one end, the other end, one side and the other side in the description of the positional relationship of the structure are all based on the present application. Figure 1-Figure 12 The illustration in the figure is described, which does not indicate the necessary installation position of the structure in the actual application of the device of the present application. The position can be adjusted as needed during actual installation, but the connection relationship of the structure is correct. The specific liquid flow direction can be referred to in the present invention. Figure 2-Figure 12 The arrows in the figure indicate the direction, and the connection relationship between the inlet and outlet is explained according to the flow direction of the refrigerant.

[0067] When working, different modes are selected according to the detected temperature.

[0068] 1. When the outside temperature is high, when the second temperature sensor 20 at the power battery module temperature and the third temperature sensor 21 at the passenger compartment detect that the temperature is relatively high, it means that the power battery module and the passenger compartment / PTC module have relatively large cooling demands, and the thermal management system will turn on the passenger compartment and power battery cooling mode; at this time, the refrigerant module medium flows from the compressor 7 to the four-way valve 11, from the connection port 1 of the four-way valve 11 to the connection port 2, and then flows to the first liquid heat exchanger 12, and then flows to the first electronic expansion valve 15 and the second electronic expansion valve 16 respectively, and then flows through the second liquid heat exchanger 13 and the third liquid heat exchanger 14 on their respective branches, and then flows into the connection port 3 of the four-way valve 11, flows out of the connection port 4 of the four-way valve 11, and then passes through the gas-liquid separation device 5, and finally is sucked back to the first water pump 2.

[0069] The off-vehicle heat exchange circuit is as follows: the medium flows in the order of the second water pump 6 , the first off-vehicle heat exchanger 8 , the first liquid heat exchanger 12 , the second expansion water tank 4 and finally flows back to the second water pump 6 .

[0070] The flow direction of the passenger compartment air conditioning thermal management branch and the battery thermal management branch is: from the first water pump 2 to the eight-way valve 1, flowing in from the connection port 3 of the eight-way valve 1, flowing out from the connection port 5 of the eight-way valve 1 is the passenger compartment refrigeration branch, and flowing out from the connection port 7 of the eight-way valve 1 is the power battery refrigeration branch; the passenger compartment refrigeration branch is that the refrigerant flows out from the eight-way valve 1, flows through the passenger compartment / PTC module, takes out the heat, and then flows in from the connection port 1 of the five-way valve 10, flows out from the connection port 2 of the five-way valve 10, flows through the second liquid heat exchanger 13, exchanges heat with the refrigerant, and then flows the low-temperature coolant back to the connection port 6 of the eight-way valve 1;

[0071] The battery thermal management branch is as follows: the refrigerant flows out from the connection port 7 of the eight-way valve 1, flows through the power battery module, takes out the heat, and then flows through the second liquid heat exchanger 13. After heat exchange with the refrigerant, the low-temperature coolant flows in from the connection port 3 of the five-way valve 10, flows out from the connection port 4 of the five-way valve 10, and then flows back to the connection port 8 of the eight-way valve 1; finally, it flows out from the connection port 2 of the eight-way valve 1, passes through the first expansion water tank 3 and flows back to the first water pump 2.

[0072] In this mode, the motor module adopts air cooling mode, and the motor fan 18 blows air to the motor module. The hot wind will pass through the electronic fan 17, the second external heat exchanger 9, and the first external heat exchanger 8 and blow to the atmosphere.

[0073] 2. When the first temperature sensor 19 at the motor module detects that the temperature is relatively high, the thermal management system will turn on the battery, passenger compartment cooling and motor liquid cooling modes on the premise of turning on the passenger compartment and power battery cooling modes; at this time, the flow direction of the refrigerant module medium is from the compressor 7 to the four-way valve 11, from the connection port 1 of the four-way valve 11 to the connection port 2 of the four-way valve 11, then to the first liquid heat exchanger 12, and then to the first electronic expansion valve 15 and the second electronic expansion valve 16 respectively, and then flow through the second liquid heat exchanger 13 and the third liquid heat exchanger 14 on their respective branches, and then flow into the connection port 3 of the four-way valve 11, flow out of the connection port 4 of the four-way valve 11, and then pass through the gas-liquid separation device 5, and finally be sucked back to the compressor 7.

[0074] The off-vehicle heat exchange circuit is as follows: the medium flows to the second water pump 6 , the first off-vehicle heat exchanger 8 , the first liquid heat exchanger 12 , the second expansion water tank 4 , and finally flows back to the second water pump 6 .

[0075] The flow direction of the passenger compartment air conditioning and battery thermal management circuit is: from the first water pump 2 to the eight-way valve 1, flowing in from the connection port 3 of the eight-way valve 1, flowing out from the connection port 5 of the eight-way valve 1 is the passenger compartment cooling branch, and flowing out from the connection port 7 of the eight-way valve 1 is the power battery cooling and motor liquid cooling branch;

[0076] The passenger compartment refrigeration branch is that the refrigerant flows out of the eight-way valve 1, flows through the passenger compartment / PTC module, takes out the heat, and then flows into the connection port 1 of the five-way valve 10, flows out of the connection port 2 of the five-way valve 10, flows through the second liquid heat exchanger 13, exchanges heat with the refrigerant, and then flows back to the connection port 6 of the eight-way valve 1;

[0077] The refrigerant flow direction of the power battery cooling and motor liquid cooling branches is as follows: the refrigerant flows out from the connection port 7 of the eight-way valve 1, flows through the power battery module, takes out the heat, flows through the second liquid heat exchanger 13, exchanges heat with the refrigerant to become a low-temperature coolant, then flows through the motor module, and finally flows back to the connection port 8 of the eight-way valve 1; finally, it flows out from the connection port 2 of the eight-way valve 1, flows back to the first water pump 2 through the first expansion water tank 3;

[0078] 3. When the outside temperature is not too high and the cooling demand for the power battery and the motor is not too great, the refrigerant module circuit will not operate at high power and the second electronic expansion valve 16 will not be opened for the purpose of reducing energy consumption; at this time, the thermal management system will turn on the passenger compartment cooling, battery external circuit water cooling and motor air cooling modes: in this mode, the refrigerant module medium flows from the compressor 7 to the four-way valve 11, from the connection port 1 of the four-way valve 11 to the connection port 2, then to the first liquid heat exchanger 12, then to the first electronic expansion valve 15, then to the second liquid heat exchanger 13, then flows in from the connection port 3 of the four-way valve 11, flows out from the connection port 4 of the four-way valve 11, then passes through the gas-liquid separation device 5, and finally is sucked back to the compressor 7.

[0079] The off-vehicle heat exchange circuit includes: according to the medium flow direction, it includes the second water pump 6, the first off-vehicle heat exchanger 8, the second flow channel of the first liquid heat exchanger 12, the second expansion water tank 4, and finally flows back to the second water pump 6.

[0080] The flow direction of the passenger compartment refrigeration circuit is as follows: after being pumped out by the first water pump 2, it flows in from the connection port 3 of the eight-way valve 1, flows out from the connection port 5 of the eight-way valve 1, flows through the passenger compartment / PTC module, and after taking out the heat, it flows in from the connection port 1 of the five-way valve 10, flows out from the connection port 2 of the five-way valve 10, flows through the second liquid heat exchanger 13, exchanges heat with the refrigerant, and then flows the low-temperature coolant back to the connection port 6 of the eight-way valve 1, and then flows from the connection port 2 of the eight-way valve 1 through the first expansion water tank 3, and finally flows back to the first water pump 2.

[0081] Power battery external circuit water cooling circuit: The refrigerant is pumped out by the third water pump 26, flows through the second off-vehicle heat exchanger 9, then flows in from the connection port 4 of the eight-way valve 1, flows out from the connection port 7 of the eight-way valve 1, passes through the power battery module, takes away the heat of the battery, passes through the third liquid heat exchanger 14, then flows in from the connection port 3 of the five-way valve 10, flows out from the connection port 4 of the five-way valve 10, then flows in from the connection port 8 of the eight-way valve 1, flows out from the connection port 1 of the eight-way valve 1, and finally flows back to the third water pump 26 through the third expansion water tank 25. In this mode, the motor adopts the air cooling mode, and the motor fan 18 blows air to the motor, and the hot wind will pass through the electronic fan 17, the second off-vehicle heat exchanger 9, and the first off-vehicle heat exchanger 8 to the atmosphere.

[0082] 4. When the first temperature sensor 19 at the motor detects that the temperature is relatively high, the thermal management system will start the passenger compartment cooling and battery motor external circuit water cooling mode: in this mode, the medium of the refrigerant module flows from the compressor 7 to the four-way valve 11, from the connection port 1 of the four-way valve 11 to the connection port 2, then flows to the first liquid heat exchanger 12, then flows to the first electronic expansion valve 15, then flows to the second liquid heat exchanger 13, then flows in from the connection port 3 of the four-way valve 11, flows out from the connection port 4 of the four-way valve 11, then passes through the gas-liquid separation device 5, and finally is sucked back into the compressor 7.

[0083] The off-vehicle heat exchange circuit includes: according to the medium flow direction, it includes the second water pump 6, the first off-vehicle heat exchanger 8, the second flow channel of the first liquid heat exchanger 12, the second expansion water tank 4, and finally flows back to the second water pump 6.

[0084] The flow direction of the passenger compartment refrigeration circuit is as follows: after being pumped out by the first water pump 2, it flows in from the connection port 3 of the eight-way valve 1, flows out from the connection port 5 of the eight-way valve 1, flows through the passenger compartment / PTC module, and after taking out the heat, it flows in from the connection port 1 of the five-way valve 10, flows out from the connection port 2 of the five-way valve 10, flows through the second liquid heat exchanger 13, exchanges heat with the refrigerant, and then flows the low-temperature coolant back to the connection port 6 of the eight-way valve 1, and then flows from the connection port 2 of the eight-way valve 1 through the first expansion water tank 3, and finally flows back to the first water pump 2.

[0085] Battery motor external circuit water cooling circuit: the refrigerant is pumped out by the third water pump 26, flows through the second external heat exchanger 9, and then flows in from the connection port 4 of the eight-way valve 1, flows out from the connection port 7, passes through the power battery module, takes away the heat of the battery, passes through the third liquid heat exchanger 14, and then flows through the motor module, takes away the heat of the motor, then flows in from the connection port 8 of the eight-way valve 1, flows out from the connection port 1 of the eight-way valve 1, and finally flows back to the third water pump 26 through the third expansion water tank 25.

[0086] 5. When the car is used under the condition of relatively low outside temperature, when the second temperature sensor 20 at the power battery and the third temperature sensor 21 at the passenger compartment detect low temperature, the thermal management system will turn on the passenger compartment and power battery heat pump heating mode: in this mode, heating is entirely provided by the heat pump system, and the refrigerant module medium flows from the compressor 7 to the four-way valve 11, from the connection port 1 of the four-way valve 11 to the connection port 3, and then flows through the second liquid heat exchanger 13 and the third liquid heat exchanger 14 on their respective branches, and then flows to the first electronic expansion valve 15 and the second electronic expansion valve 16 respectively, and then flows to the first liquid heat exchanger 12, and then flows in from the connection port 2 of the four-way valve 11, flows out from the connection port 4 of the four-way valve 11, and then passes through the gas-liquid separation device 5, and finally is sucked back to the compressor 7.

[0087] The off-vehicle heat exchange circuit is: according to the flow direction of the medium, it includes the second water pump 6, the first off-vehicle heat exchanger 8, the second flow channel of the first liquid heat exchanger 12, the second expansion water tank 4, and finally flows back to the second water pump 6. The flow direction of the passenger compartment air conditioning thermal management branch and the battery thermal management branch is: from the first water pump 2 to the eight-way valve 1, flowing in from the connection port 3 of the eight-way valve 1, flowing out from the connection port 5 of the eight-way valve 1 is the passenger compartment heating branch, and flowing out from the connection port 7 of the eight-way valve 1 is the power battery heating branch; the passenger compartment heating branch is that the hot refrigerant flows out of the eight-way valve 1, flows through the passenger compartment / PTC module, and after providing heat to the passenger compartment, it flows in from the connection port 1 of the five-way valve 10, flows out from the connection port 2 of the five-way valve 10, and flows through the second liquid heat exchanger 13, After heat exchange with the refrigerant, the high-temperature coolant flows back to the connection port 6 of the eight-way valve 1; the battery thermal management branch is: the hot refrigerant flows out from the connection port 7 of the eight-way valve 1, flows through the power battery module, transfers heat to the power battery, and then flows through the second liquid heat exchanger 13, and after heat exchange with the refrigerant, the high-temperature coolant flows in from the connection port 3 of the five-way valve 10, flows out from the connection port 4 of the five-way valve 10, and then flows back to the connection port 8 of the eight-way valve 1; finally, it flows out from the connection port 2 of the eight-way valve 1, flows back to the first water pump 2 through the first expansion water tank 3. In this mode, the motor waste heat is utilized, and the motor fan 18 blows air to the motor, and the hot wind passes through the electronic fan 17, the second vehicle external heat exchanger 9, and the first vehicle external heat exchanger 8 and is absorbed by the heat pump system.

[0088] 6. When the first temperature sensor 19-temperature sensor at the motor detects that the motor temperature is too low, the thermal management system will turn on the passenger compartment, battery motor heat pump heating mode: in this mode, heating is provided entirely by the heat pump system. At this time, the refrigerant module medium flows from the compressor 7 to the four-way valve 11, from the connection port 1 of the four-way valve 11 to the connection port 3 of the four-way valve 11, and then flows through the second liquid heat exchanger 13 and the third liquid heat exchanger 14 on their respective branches, and then flows to the first liquid heat exchanger 12, and then flows to the first electronic expansion valve 15 and the second electronic expansion valve 16 respectively, and then flows in from the connection port 2 of the four-way valve 11, flows out from the connection port 4 of the four-way valve 11, and then passes through the gas-liquid separation device 5, and finally is sucked back to the compressor 7. The off-vehicle heat exchange circuit is: according to the medium flow direction, it includes the second water pump 6, the first off-vehicle heat exchanger 8, the second flow channel of the first liquid heat exchanger 12, the second expansion water tank 4, and finally flows back to the second water pump 6. The flow directions of the passenger compartment air conditioning thermal management branch and the battery thermal management branch are: from the first water pump 2 to the eight-way valve 1, flowing in from the connection port 3 of the eight-way valve 1, flowing out from the connection port 5 of the eight-way valve 1 for the passenger compartment heating branch, and flowing out from the connection port 7 of the eight-way valve 1 for the power battery heating branch; the passenger compartment heating branch is that the hot refrigerant flows out of the eight-way valve 1, flows through the passenger compartment / PTC module, and after providing heat to the passenger compartment, flows in from the connection port 1 of the five-way valve 10, flows out from the connection port 2 of the five-way valve 10, and flows through the second liquid heat exchanger 13 , after heat exchange with the refrigerant, the high-temperature coolant flows back to the connection port 6 of the eight-way valve 1; the battery motor thermal management branch is: the hot refrigerant flows out from the connection port 7 of the eight-way valve 1, flows through the power battery module, transfers heat to the power battery, and then flows through the second liquid heat exchanger 13, and after heat exchange with the refrigerant, the high-temperature coolant flows through the motor module, and after warming up the motor, the low-temperature refrigerant flows back to the connection port 8 of the eight-way valve 1; finally, it flows out from the connection port 2 of the eight-way valve 1, passes through the first expansion water tank 3 and flows back to the first water pump 2.

[0089] 7. When the outside temperature drops further, so that the heat pump system alone cannot meet the heating demand of the car, the thermal management system will open the passenger compartment, power battery heat pump and PTC joint heating mode: in this mode, the heat pump system and PTC are used to provide heating. At this time, the refrigerant module medium flows from the compressor 7 to the four-way valve 11, from the connection port 1 of the four-way valve 11 to the connection port 3 of the four-way valve 11, then flows through the third liquid heat exchanger 14 on the branch, then flows to the second electronic expansion valve 16, then flows to the first liquid heat exchanger 12, then flows in from the connection port 2 of the four-way valve 11, flows out from the connection port 4 of the four-way valve 11, then passes through the gas-liquid separation device 5, and finally is sucked back to the compressor 7. The off-vehicle heat exchange circuit is: according to the medium flow direction, it includes the second water pump 6, the first off-vehicle heat exchanger 8, the second flow channel of the first liquid heat exchanger 12, the second expansion water tank 4, and finally flows back to the second water pump 6. The flow directions of the passenger compartment PTC thermal management branch and the battery thermal management branch are: from the first water pump 2 to the eight-way valve 1, flowing in from the connection port 3 of the eight-way valve 1, flowing out from the connection port 5 of the eight-way valve 1 is the passenger compartment PTC heating branch, and flowing out from the connection port 7 of the eight-way valve 1 is the power battery heating branch; the passenger compartment PTC heating branch is, the refrigerant flows out of the eight-way valve 1, flows through the passenger compartment / PTC module, the PTC module heats the coolant and provides it to the passenger compartment, then flows in from the connection port 1 of the five-way valve 10, and flows out from the connection port 2 of the five-way valve 10, The hot coolant flows through the second liquid heat exchanger 13, and flows back to the connection port 6 of the eight-way valve 1; the battery thermal management branch is: the hot coolant flows out from the connection port 7 of the eight-way valve 1, flows through the power battery module, transfers the heat to the power battery, and then flows through the second liquid heat exchanger 13, exchanges heat with the refrigerant, and then flows into the connection port 3 of the five-way valve 10, flows out from the connection port 4 of the five-way valve 10, and then flows back to the connection port 8 of the eight-way valve 1; finally, it flows out from the connection port 2 of the eight-way valve 1, flows back to the first water pump 2 through the first expansion tank 3. In this mode, the motor waste heat is utilized, and the motor fan 18 blows air to the motor, and the hot wind passes through the electronic fan 17, the second vehicle exterior heat exchanger 9, and the first vehicle exterior heat exchanger 8 and is absorbed by the heat pump system.

[0090] 8. When the outside temperature is too low, so that the energy consumption of the heat pump system is higher than that of the PTC, the heating demand of the car is completely provided by the PTC and the residual heat of the motor, and the heat pump system will not work at all. At this time, the thermal management system will turn on the PTC heating motor residual heat auxiliary heating mode: In this mode, the various components are arranged in the order of the medium flow direction. The coolant flows from the first water pump 2 to the eight-way valve 1, flows in from the connection port 3 of the eight-way valve 1, flows out from the connection port 5 of the eight-way valve 1, and then passes through the passenger compartment / PTC module. The PTC heats the refrigerant into a high The warm refrigerant, after heating the passenger compartment, flows to the connection port 1 of the five-way valve 10, flows out from the connection port 2 of the five-way valve 10, passes through the second liquid heat exchanger 13, flows in from the connection port 5 of the five-way valve 10, flows out from the connection port 4 of the five-way valve 10, flows through the motor module, absorbs the residual heat of the motor, flows to the third liquid heat exchanger 14, and then flows to the power battery module. After heating the battery, it flows in from the connection port 7 of the eight-way valve 1, flows out from the connection port 2 of the eight-way valve 1, passes through the first expansion water tank 3, and flows back to the first water pump 2.

[0091] IX. When the first off-vehicle heat exchanger 8 or the second off-vehicle heat exchanger 9 is frosted under low temperature conditions, the thermal management system will turn on the defrost mode: in this mode, the heat pump system will stop working, and the PTC will turn on to defrost the off-vehicle heat exchanger; in this mode, the components flow in the following order: the coolant flows from the third water pump 26 to the second off-vehicle heat exchanger 9, then flows to the eight-way valve 1, flows in from the connection port 4 of the eight-way valve 1, flows out from the connection port 5 of the eight-way valve 1, and then passes through the passenger compartment / PTC module, and the PTC heats the refrigerant into After heating the passenger compartment, the high-temperature refrigerant flows to the connection port 1 of the five-way valve 10, flows out from the connection port 2 of the five-way valve 10, passes through the second liquid heat exchanger 13, flows in from the connection port 5 of the five-way valve 10, flows out from the connection port 4 of the five-way valve 10, flows through the motor module, absorbs the residual heat of the motor, flows to the third liquid heat exchanger 14, flows to the power battery module, and after heating the battery, flows in from the connection port 7 of the eight-way valve 1, flows out from the connection port 1 of the eight-way valve 1, and flows back to the third water pump 26 through the third expansion water tank 25. In this mode, the residual heat of the motor is utilized, and the motor fan 18 blows air to the motor, and blows the hot wind to the electronic fan 17, accelerating the defrosting speed of the second external heat exchanger 9 and the first external heat exchanger 8.

[0092] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A thermal management system for pure electric new energy vehicles based on R290 refrigerant, characterized in that: The refrigerant module comprises a gas-liquid separation device (5), a compressor (7), a four-way valve (11), a first liquid heat exchanger (12), a second liquid heat exchanger (13), a third liquid heat exchanger (14), a first electronic expansion valve (15) and a second electronic expansion valve (16), wherein the top end of the four-way valve (11) is connected to the compressor (7) via a pipeline, one end of the compressor (7) is connected to the gas-liquid separation device (5), one end of the gas-liquid separation device (5) is connected to one end of the four-way valve (11), and the end of the four-way valve (11) away from the gas-liquid separation device (5) is connected to the first liquid heat exchanger (12). The bottom of the first liquid heat exchanger (12) is connected to a first electronic expansion valve (15) and a second electronic expansion valve (16) via pipelines, the bottom of the four-way valve (11) is connected to a third liquid heat exchanger (14), and the bottom of the third liquid heat exchanger (14) is connected to the second electronic expansion valve (16); the bottom of the four-way valve (11) is also connected to a second liquid heat exchanger (13), a fourth temperature sensor (22) is connected between the four-way valve (11) and the second liquid heat exchanger (13), and the bottom of the second liquid heat exchanger (13) is connected to the first electronic expansion valve (15).

2. A pure electric new energy vehicle thermal management system based on R290 refrigerant according to claim 1, characterized in that: The refrigerant module uses R290 refrigerant as the medium.

3. A pure electric new energy vehicle thermal management system based on R290 refrigerant according to claim 1, characterized in that: A temperature and pressure sensor (24) is also connected between the top end of the four-way valve (11) and the compressor (7); and a fifth temperature sensor (23) is also connected between the four-way valve (11) and the third liquid heat exchanger (14).

4. A thermal management system for pure electric new energy vehicles based on R290 refrigerant according to claim 1, characterized in that: The outer side of the four-way valve (11) is respectively provided with a connection port 1, a connection port 2, a connection port 3 and a connection port 4; the connection port 1 on the four-way valve (11) is connected to the compressor (7); the connection port 4 on the four-way valve (11) is connected to the gas-liquid separation device (5); the connection port 3 on the four-way valve (11) is connected to the third liquid heat exchanger (14); the connection port 3 on the four-way valve (11) is also connected to the second liquid heat exchanger (13); and the connection port 4 on the four-way valve (11) is connected to the gas-liquid separation device (5).

5. A pure electric new energy vehicle thermal management system based on R290 refrigerant according to claim 1, characterized in that: According to the flow direction of the medium, the medium flows through the compressor (7), the connection port 1 in the four-way valve (11) to the connection port 2, the first liquid heat exchanger (12), the first electronic expansion valve (15), the second electronic expansion valve (16), the second liquid heat exchanger (13), the third liquid heat exchanger (14), the connection port 3 in the four-way valve (11) to the connection port 4, the gas-liquid separation device (5), and returns to the compressor (7) to form a refrigeration circuit of the refrigerant module; According to the flow direction of the medium, it flows through the compressor (7), the connection port 1 in the four-way valve (11) to the connection port 3, the second liquid heat exchanger (13), the third liquid heat exchanger (14), the first liquid heat exchanger (12), the connection port 2 in the four-way valve (11) to the connection port 4, the gas-liquid separation device (5), and returns to the compressor (7) to form a heating circuit of the refrigerant module.

6. A pure electric new energy vehicle thermal management system based on R290 refrigerant according to claim 1, characterized in that: The vehicle further comprises an eight-way valve (1), one end of the eight-way valve (1) being connected to a first water pump (2), one end of the first water pump (2) being connected to a first expansion water tank (3), the first expansion water tank (3) being connected to the eight-way valve (1), the bottom of one end of the eight-way valve (1) being connected to a second off-vehicle heat exchanger (9), the bottom of the second off-vehicle heat exchanger (9) being provided with an electronic fan (17), one end of the second off-vehicle heat exchanger (9) being connected to a third water pump (26), and one end of the third water pump (26) being connected to a third expansion water tank (25). The third expansion water tank (25) is connected to the eight-way valve (1); the first off-vehicle heat exchanger (8) is arranged on the top of the second off-vehicle heat exchanger (9); one end of the first off-vehicle heat exchanger (8) is connected to one end of the top of the first liquid heat exchanger (12); one end of the bottom of the first liquid heat exchanger (12) is connected to the second expansion water tank (4); one end of the second expansion water tank (4) is connected to the second water pump (6); the second water pump (6) is connected to the first off-vehicle heat exchanger (8); one end of the bottom of the eight-way valve (1) is connected to the passenger compartment / PTC module, one end of the passenger compartment / PTC module is connected to a five-way valve (10), one end of the five-way valve (10) is connected to one end of the top of the second liquid heat exchanger (13), one end of the bottom of the second liquid heat exchanger (13) is connected to an eight-way valve (1), the other end of the five-way valve (10) is connected to a pipeline between the second liquid heat exchanger (13) and the eight-way valve (1), the other end of the bottom of the eight-way valve (1) is connected to a power battery module, one end of the power battery module is connected to one end of the top of the third liquid heat exchanger (14), The power battery module is connected to the top of the third liquid heat exchanger (14), and a second temperature sensor (20) is also connected between the power battery module and one end of the top of the third liquid heat exchanger (14). The other end of the top of the eight-way valve (1) is connected to a motor module. A motor fan (18) is provided at the bottom of the motor module. One end of the motor module is connected to one end of the bottom of the third liquid heat exchanger (14). One end of the bottom of the five-way valve (10) is connected between the motor module and the third liquid heat exchanger (14), and the other end of the bottom of the five-way valve (10) is connected between the motor module and the eight-way valve (1).

7. A thermal management system for pure electric new energy vehicles based on R290 refrigerant according to claim 6, characterized in that: A third temperature sensor (21) is also connected between the passenger compartment / PTC module and the five-way valve (10).

8. A thermal management system for pure electric new energy vehicles based on R290 refrigerant according to claim 6, characterized in that: The outer side of the eight-way valve (1) is respectively provided with a connection port 1, a connection port 2, a connection port 3, a connection port 4, a connection port 5, a connection port 6, a connection port 7 and a connection port 8. The connection port 1 on the eight-way valve (1) is connected to the third expansion water tank (25), the connection port 2 on the eight-way valve (1) is connected to the first expansion water tank (3), the connection port 3 on the eight-way valve (1) is connected to the first water pump (2), the connection port 4 on the eight-way valve (1) is connected to the second off-vehicle heat exchanger (9), the connection port 5 on the eight-way valve (1) is connected to the passenger compartment / PTC module, one end of the bottom of the second liquid heat exchanger (13) is connected to the connection port 6 on the eight-way valve (1), the connection port 7 on the eight-way valve (1) is connected to the power battery module, and the connection port 8 on the eight-way valve (1) is connected to the motor module.

9. A pure electric new energy vehicle thermal management system based on R290 refrigerant according to claim 6, characterized in that: The outside of the five-way valve (10) is respectively provided with a connection port 1, a connection port 2, a connection port 3, a connection port 4 and a connection port 5; the connection port 1 on the five-way valve (10) is connected to the passenger compartment / PTC module; the connection port 2 on the five-way valve (10) is connected to the second liquid heat exchanger (13); the connection port 3 on the five-way valve (10) is connected between the motor and the third liquid heat exchanger (14); the connection port 4 on the five-way valve (10) is connected between the motor and the eight-way valve (1); and the connection port 5 on the five-way valve (10) is connected to a pipeline between the second liquid heat exchanger (13) and the eight-way valve (1).

10. A thermal management system for pure electric new energy vehicles based on R290 refrigerant according to claim 6, characterized in that: According to the flow direction of the medium, the medium flows through the first water pump (2), the connection port 3 in the eight-way valve (1) to the connection port 5, the passenger compartment / PTC module, the connection port 1 in the five-way valve (10) to the connection port 2, the second liquid heat exchanger (13), the connection port 6 in the eight-way valve (1) to the connection port 2, the first expansion water tank (3), and returns to the first water pump (2) to form a passenger compartment air conditioning thermal management circuit; According to the flow direction of the medium, the medium flows through the first water pump (2), the connection port 3 in the eight-way valve (1) to the connection port 7, the power battery module, the third liquid heat exchanger (14), the connection port 3 in the five-way valve (10) to the connection port 4, the connection port 8 in the eight-way valve (1) to the connection port 2, the first expansion water tank (3), and returns to the first water pump (2) to form a battery thermal management loop; According to the medium flow direction, the medium flows through the third water pump (26), the second off-board heat exchanger (9), the connection port 4 in the eight-way valve (1) to the connection port 7, the power battery module, the third liquid heat exchanger (14), the motor module, the connection port 8 in the eight-way valve (1) to the connection port 1, the third expansion water tank (25), and returns to the third water pump (26) to form a battery motor thermal management loop; The medium flows through the second water pump (6), the first off-vehicle heat exchanger (8), the first liquid heat exchanger (12), the second expansion water tank (4), and returns to the second water pump (6) to form an off-vehicle heat exchange circuit; The medium flows through the motor fan (18), the motor module, the electronic fan (17), the first off-vehicle heat exchanger (8), and the second off-vehicle heat exchanger (9) to the outside of the vehicle to form a motor air cooling route.

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