Vehicle thermal management system and vehicle

Abstract

The present invention relates to the field of thermal management technology, and specifically to a vehicle thermal management system and a vehicle, comprising a first thermal management circuit, a second thermal management circuit, and a refrigerant circulation circuit; the first thermal management circuit is provided with a first pump, a coolant flow channel of a first heat exchanger, and a first thermal management object; the second thermal management circuit is provided with a second pump, a coolant flow channel of a second heat exchanger, and a second thermal management object; the refrigerant circulation circuit is provided with a refrigerant flow channel of a second heat exchanger and a refrigerant flow channel of a first heat exchanger connected in series; a branch pipe is connected between the outlet of the coolant flow channel of the second heat exchanger and the inlet of the coolant flow channel of the first heat exchanger, and a proportional control valve is connected to the branch pipe. The present invention achieves auxiliary heating of the refrigerant in the refrigerant circulation circuit through the water side, has a simple structure, and is low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management, and in particular to a vehicle thermal management system and a vehicle. Background Art

[0002] See also Figure 1 As shown, the refrigerant-side hot gas bypass circuit of the current vehicle thermal management system includes an existing compressor 100, an existing second heat exchanger 200, an existing first expansion valve 300, an existing first heat exchanger 400, and an existing gas-liquid separator 500 connected in series. An existing second expansion valve 600 is connected in parallel between the liquid outlet of the existing compressor 100 and the liquid inlet of the existing gas-liquid separator 500. The hot gas bypass process in this solution is as follows: the liquid outlet of the existing compressor 100 is divided into two paths: a main path and a branch path. The main path flows into the refrigerant side of the existing second heat exchanger 200 to release heat. The heat is then transferred to the heating core of the air conditioning assembly through the water side of the existing second heat exchanger 200, thereby heating the passenger compartment. The liquid discharged from the refrigerant side of the existing second heat exchanger 200 is then throttled and expanded by the existing first expansion valve 300 to a low-pressure two-phase liquid, which then enters the refrigerant side of the existing first heat exchanger 400. The water path in the existing first heat exchanger 400 is closed, meaning that the refrigerant does not exchange heat with the existing first heat exchanger. The branch line is throttled and reduced in pressure by the existing second expansion valve 600 to a low-pressure superheated gas. This gas mixes with the liquid passing through the refrigerant side of the existing first heat exchanger 400, becoming superheated gas that enters the gas-liquid separator 500 and then the existing compressor 100. At this point, the thermal management system draws power from the existing compressor 100 and releases heat in the existing second heat exchanger 200, with no heat exchange occurring with the environment or other components.

[0003] The installation of two expansion valves (the existing first expansion valve 300 and the existing second expansion valve 600) increases coordination and control complexity, requiring engineers to demonstrate enhanced calibration skills. Furthermore, the refrigerant-side hot gas bypass places even more stringent performance requirements on the existing compressor, placing even greater stress on its reliability. Furthermore, the refrigerant bypass circuit and the arrangement of multiple expansion valves increase the cost of the thermal management system. Summary of the Invention

[0004] The object of the present invention is to provide a vehicle thermal management system and a vehicle, which realizes auxiliary heating of the refrigerant in the refrigerant circulation loop through the water side, has a simple structure and is low in cost.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] In the first aspect, the present invention provides a vehicle thermal management system, comprising a first thermal management circuit, a second thermal management circuit and a refrigerant circulation circuit; the first thermal management circuit is provided with a first pump, a coolant flow channel of a first heat exchanger and a first thermal management object; the second thermal management circuit is provided with a second pump, a coolant flow channel of a second heat exchanger and a second thermal management object; the refrigerant circulation circuit is provided with a refrigerant flow channel of a second heat exchanger and a refrigerant flow channel of a first heat exchanger connected in series; a branch pipe is connected between the outlet of the coolant flow channel of the second heat exchanger and the inlet of the coolant flow channel of the first heat exchanger, and a proportional control valve is connected to the branch pipe.

[0007] Furthermore, the coolant flow channel outlet of the second heat exchanger is connected to the liquid inlet r of the first three-way proportional valve, the liquid outlet s of the first three-way proportional valve is connected to the coolant flow channel inlet of the first heat exchanger, the liquid outlet t of the first three-way proportional valve is connected to the first thermal management object, and the first three-way proportional valve is used as a proportional control valve of the branch pipe.

[0008] Furthermore, the first thermal management object includes a refrigeration core of an air conditioning assembly, a battery assembly, and an electric drive assembly;

[0009] And / or, the second thermal management object includes a heating core of the air-conditioning assembly, a battery assembly and an electric drive assembly.

[0010] Furthermore, it also includes a second three-way proportional valve, a third three-way proportional valve and a multi-way valve, the outlet of the coolant flow channel of the first heat exchanger is connected to the liquid inlet u of the second three-way proportional valve, the outlet v of the second three-way proportional valve is connected to the liquid inlet a of the multi-way valve, and the outlet w of the second three-way proportional valve is connected to the refrigeration core of the air-conditioning assembly; the outlet of the coolant flow channel of the second heat exchanger is connected to the liquid inlet x of the third three-way proportional valve, and the outlet of the third three-way proportional valve is connected to the liquid inlet x of the third three-way proportional valve. Port z is connected to the liquid inlet e of the multi-way valve, and the liquid outlet y of the third three-way proportional valve is connected to the heating core of the air-conditioning assembly; the liquid outlet b of the multi-way valve is connected to the liquid inlet of the coolant flow channel of the first heat exchanger, and the liquid outlet f of the multi-way valve is connected to the liquid inlet of the coolant flow channel of the second heat exchanger; the two ends of the battery assembly are respectively connected to the liquid outlet c and the liquid inlet d of the multi-way valve, and the two ends of the electric drive assembly are respectively connected to the liquid outlet i and the liquid inlet h of the multi-way valve.

[0011] Furthermore, the liquid outlet g of the multi-way valve is connected to the liquid inlet of the radiator, and the liquid outlet of the radiator is connected to the liquid inlet of the electric drive system of the electric drive assembly.

[0012] Furthermore, it also includes a first fluid replenishment tank connected to the first thermal management circuit and the second thermal management circuit.

[0013] Furthermore, a compressor and an expansion valve are also provided in the refrigerant circulation circuit. The compressor is connected between the liquid outlet of the refrigerant flow channel of the first heat exchanger and the liquid inlet of the refrigerant flow channel of the second heat exchanger. The expansion valve is arranged at the liquid inlet position of the refrigerant flow channel of the first heat exchanger.

[0014] Furthermore, it also includes a second liquid replenishing tank connected to the refrigerant circulation loop.

[0015] In a second aspect, the present invention provides a vehicle comprising the vehicle thermal management system of the above-mentioned air-conditioning assembly with a single heat exchanger.

[0016] Beneficial effects of the present invention: The present invention connects a branch pipe between the coolant flow channel outlet of the second heat exchanger and the coolant flow channel inlet of the first heat exchanger, and a proportional control valve is connected to the branch pipe. The proportional control valve is opened according to actual needs to connect the coolant flow channel outlet of the second heat exchanger and the coolant flow channel inlet of the first heat exchanger, so that the refrigerant temperature in the refrigerant flow channel of the first heat exchanger is rapidly increased, thereby ensuring that the refrigerant temperature at the compressor inlet reaches the preset value, allowing the compressor to increase the high pressure and speed to work and release heat more quickly. The bypass solenoid valve is eliminated on the refrigerant side, and the refrigerant circuit structure and control are simpler, the structure is simple, the cost is low, and the compressor speed fluctuation range is relatively small during the whole process, and it operates in a relatively stable state with higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the implementation or prior art description. Obviously, the drawings described below are only some embodiments of the present invention.

[0018] Figure 1 The schematic diagram shows the structure of the existing refrigerant side hot gas bypass thermal management system.

[0019] Figure 2 A schematic structural diagram of a vehicle thermal management system provided by an embodiment of the present invention is shown.

[0020] Figure 3 A schematic structural diagram of a vehicle thermal management system provided by an embodiment of the present invention when in a first mode is shown.

[0021] Figure 4 A schematic structural diagram of a vehicle thermal management system provided by an embodiment of the present invention when in the second mode is shown.

[0022] Figure 5 A schematic structural diagram of a vehicle thermal management system provided by an embodiment of the present invention in the third mode is shown.

[0023] Figure 6A schematic structural diagram of a vehicle thermal management system provided by an embodiment of the present invention in a fourth mode is shown.

[0024] Figure 7 A compressor speed curve diagram of the thermal management system provided by the prior art and the embodiment of the present invention in the hot gas bypass mode is shown, where the abscissa represents time and the ordinate represents the compressor speed.

[0025] In the figure, 1 is the first thermal management circuit, 11 is the first pump, 12 is the coolant flow channel of the first heat exchanger, and 13 is the first one-way valve;

[0026] 2—second thermal management circuit, 21—second pump, 22—coolant flow channel of the second heat exchanger;

[0027] 3—refrigerant circulation loop, 31—refrigerant flow channel of the second heat exchanger, 32—refrigerant flow channel of the first heat exchanger, 33—compressor, 34—expansion valve, 35—second liquid replenishing tank;

[0028] 4—branch pipe;

[0029] 5—air conditioning assembly, 51—heating core, 52—cooling core, 53—first fan;

[0030] 6—battery assembly, 61—battery system, 62—third pump, 63—second one-way valve;

[0031] 7—Electric drive assembly, 71—Electric drive system, 72—Radiator, 73—Second fan;

[0032] 8—First three-way proportional valve,

[0033] 9—Second three-way proportional valve,

[0034] 10—Third three-way proportional valve,

[0035] 20—Multi-way valve,

[0036] 30—First fluid replacement tank,

[0037] 40—Parameter acquisition component,

[0038] 100—existing compressor, 200—existing second heat exchanger, 300—existing first expansion valve, 400—existing first heat exchanger, 500—existing gas-liquid separator, 600—existing second expansion valve. DETAILED DESCRIPTION

[0039] The following describes the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will readily appreciate the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the various details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0040] In one embodiment, see Figure 2 As shown, a vehicle thermal management system with a water-side hot gas bypass function is provided. The vehicle thermal management system includes a first thermal management circuit 1, a second thermal management circuit 2, and a refrigerant circulation circuit 3. The first thermal management circuit 1 is provided with a first pump 11, a coolant flow channel 12 of a first heat exchanger, and a first thermal management object. The second thermal management circuit 2 is provided with a second pump 21, a coolant flow channel 22 of a second heat exchanger, and a second thermal management object. The refrigerant circulation circuit 3 is provided with a refrigerant flow channel 31 of a second heat exchanger and a refrigerant flow channel 32 of a first heat exchanger connected in series. A branch pipe 4 is connected between the outlet of the coolant flow channel 22 of the second heat exchanger and the inlet of the coolant flow channel 12 of the first heat exchanger. A proportional control valve is connected to the branch pipe 4.

[0041] The refrigerant circulation loop 3 is also provided with a compressor 33 and an expansion valve 34. The compressor 33 is connected between the liquid outlet of the refrigerant flow channel 32 of the first heat exchanger and the liquid inlet of the refrigerant flow channel 31 of the second heat exchanger. The expansion valve 34 is arranged at the liquid inlet position of the refrigerant flow channel 32 of the first heat exchanger.

[0042] During specific operation, in the refrigerant circulation loop 3, the refrigerant from the refrigerant flow channel 32 of the first heat exchanger is compressed into high-temperature, high-pressure refrigerant by the compressor 33. The high-temperature, high-pressure refrigerant then flows through the refrigerant flow channel 31 of the second heat exchanger and undergoes heat exchange with the coolant in the coolant flow channel 22 of the second heat exchanger. The refrigerant flowing through the refrigerant flow channel 31 of the second heat exchanger is then throttled and expanded by the expansion valve 34, and then flows through the refrigerant flow channel 32 of the first heat exchanger to undergo heat exchange with the coolant in the coolant flow channel 12 of the first heat exchanger. The refrigerant then returns to the compressor 33, completing its self-circulation. In this way, in the refrigerant circulation loop 3, the high-temperature, high-pressure refrigerant releases heat in the refrigerant flow channel 31 of the second heat exchanger and absorbs heat in the refrigerant flow channel 32 of the first heat exchanger, thus completing the refrigerant cycle.

[0043] In the first thermal management loop 1, a first pump 11 serves as a power source, driving the circulation of coolant within the first thermal management loop 1. The coolant in the coolant flow channel 12 of the first heat exchanger exchanges heat with the low-temperature refrigerant in the refrigerant flow channel 32 of the first heat exchanger to reduce the temperature of the coolant in the coolant flow channel 12 of the first heat exchanger. The cooled coolant is then delivered to the first thermal management object, achieving temperature control of the first thermal management object.

[0044] In the second thermal management loop 2, a second pump 21 serves as a power source, driving the coolant to circulate within the second thermal management loop 2. The coolant in the coolant flow channel 22 of the second heat exchanger exchanges heat with the high-temperature refrigerant in the refrigerant flow channel 31 of the second heat exchanger, raising the temperature of the coolant in the coolant flow channel 22 of the second heat exchanger. The cooled coolant is then delivered to the second thermal management object, achieving temperature control of the second thermal management object.

[0045] The system also has a hot gas bypass function, which involves shutting down the first pump 11 and opening the proportional control valve on the branch pipe 4, connecting the outlet of the coolant flow channel 22 of the second heat exchanger with the inlet of the coolant flow channel 12 of the first heat exchanger. The heated coolant is then transported to the coolant flow channel 12 of the first heat exchanger through the branch pipe 4. Furthermore, since the first pump 11 is shut down, the coolant in the coolant flow channel 12 of the first heat exchanger is all high-temperature coolant, rapidly increasing the refrigerant temperature in the refrigerant flow channel 12 of the first heat exchanger. This ensures that the refrigerant temperature at the inlet of the compressor 33 quickly reaches the preset value, allowing the compressor 33 to more quickly increase its high pressure and speed to generate work and release heat.

[0046] Figure 7 This figure shows compressor speed curves for the thermal management system in hot gas bypass mode, using the prior art and an embodiment of the present invention. The horizontal axis represents time, and the vertical axis represents compressor speed. The prior art thermal management system serves as a comparative example. The compressors in both the embodiment and the comparative example control the same high and low pressures and liquid inlet superheat.

[0047] Depend on Figure 7 It can be seen that, compared with the comparative example, the compressor speed fluctuation range of this embodiment is smaller, and it operates in a relatively stable state, which in turn places lower requirements on the compressor performance, making the compressor more reliable.

[0048] It is understandable that the first thermal management circuit 1 , the second thermal management circuit 2 and the refrigerant circulation circuit 3 in this embodiment may include other components in addition to the components mentioned above, such as some temperature sensors, pressure sensors, etc.

[0049] It should be noted that refrigerants can include R12 (difluoromethane), R22 (difluoromethane), R134a (tetrafluoroethane), R407c, R410a, R290 (propane), R32 (difluoromethane), or 1234yf. Coolants can include inorganic substances such as calcium chloride (CaCl2), organic substances such as methanol (CH3OH), ethanol (C2H5OH, commonly known as alcohol), ethylene glycol (C2H4(OH)2, commonly known as sweet alcohol), glycerol (C3H5(OH)3, commonly known as glycerin), lubricating oil, and common ingredients such as sugar and honey. All of these can serve as mother liquors for antifreeze. By adding an appropriate amount of soft water (water containing no or a small amount of calcium and magnesium ions, such as distilled water, uncontaminated rainwater, or snowwater, with a total hardness concentration between 0 and 30 ppm), antifreeze can be prepared in the general sense.

[0050] It can be seen that the thermal management system of the present invention has a simple structure. Figure 1 The prior art shown here eliminates a bypass branch in the refrigerant circulation loop and the existing first expansion valve 600, reducing coordination control complexity and the calibration requirements for engineers. The elimination of the existing first expansion valve reduces the cost of the thermal management system.

[0051] Exemplarily, the first heat exchanger is a chiller, and the second heat exchanger is a water-cooled condenser.

[0052] In a preferred embodiment, see Figure 2 As shown, the outlet of the coolant flow channel 22 of the second heat exchanger is connected to the liquid inlet r of the first three-way proportional valve 8, the outlet s of the first three-way proportional valve 8 is connected to the liquid inlet of the coolant flow channel 12 of the first heat exchanger, the outlet t of the first three-way proportional valve 8 is connected to the first thermal management object, and the first three-way proportional valve 8 is used as the proportional control valve of the branch pipe (4).

[0053] In a preferred embodiment, see Figure 2 As shown, the first thermal management object includes the cooling core 52 of the air-conditioning assembly 5, the battery assembly 6 and the electric drive assembly 7; and / or, the second thermal management object includes the heating core 51 of the air-conditioning assembly 5, the battery assembly 6 and the electric drive assembly 7.

[0054] In a preferred embodiment, see Figure 2 As shown, the first thermal management target includes the cooling core 52 of the air conditioning assembly 5, the battery assembly 6, and the electric drive assembly 7, while the second thermal management target includes the heating core 51 of the air conditioning assembly 5, the battery assembly 6, and the electric drive assembly 7. The thermal management system also includes a second three-way proportional valve 9, a third three-way proportional valve 10, and a multi-way valve 20.

[0055] The outlet of the coolant flow channel 12 of the first heat exchanger is connected to the inlet u of the second three-way proportional valve 9, the outlet v of the second three-way proportional valve 9 is connected to the inlet a of the multi-way valve 20, and the outlet w of the second three-way proportional valve 9 is connected to the cooling core 52 of the air conditioning assembly 5. The outlet of the coolant flow channel 22 of the second heat exchanger is connected to the inlet x of the third three-way proportional valve 10, the outlet z of the third three-way proportional valve 10 is connected to the inlet e of the multi-way valve 20, and the outlet y of the third three-way proportional valve 10 is connected to the heating core 51 of the air conditioning assembly 5. The outlet b of the multi-way valve 20 is connected to the inlet of the coolant flow channel 12 of the first heat exchanger, and the outlet f of the multi-way valve 20 is connected to the inlet of the coolant flow channel 22 of the second heat exchanger. The two ends of the battery assembly 6 are respectively connected to the liquid outlet c and the liquid inlet d of the multi-way valve 20 , and the two ends of the electric drive assembly 7 are respectively connected to the liquid outlet i and the liquid inlet h of the multi-way valve 20 .

[0056] The multi-way valve 20 is controlled in coordination with the first three-way proportional valve 8 , the second three-way proportional valve 9 and the third three-way proportional valve 10 to meet various heat regulation modes of the thermal management system.

[0057] For example, see Figure 2 As shown, the liquid inlet of the first pump body 11 is connected to a first one-way valve 13 to ensure the one-way passage of the coolant.

[0058] For example, see Figure 2 As shown, the air-conditioning assembly 5 also includes a first fan 53 arranged near the heating core 51 and the cooling core 52. The first fan 53 is used to blow the air heated by the heating core 51 or the air cooled by the cooling core 52 into the passenger compartment of the vehicle, thereby heating or cooling the passenger compartment.

[0059] For example, see Figure 2 As shown, the battery assembly 6 includes a third pump 62, a battery system 61, and a second one-way valve 63 connected in series. The third pump 62 is used to pump coolant to increase the flow rate and climbing ability of the coolant, thereby achieving temperature control of the battery system 61.

[0060] In a preferred embodiment, see Figure 2 As shown, the liquid outlet g of the multi-way valve 20 is connected to the liquid inlet of the radiator 72, and the liquid outlet of the radiator 72 is connected to the liquid inlet of the electric drive system 71 of the electric drive assembly 7. According to actual needs, the liquid outlet g and / or the liquid outlet h of the multi-way valve 20 are selectively opened to deliver the coolant to the radiator 72 or directly to the electric drive system 71.

[0061] A second fan 73 is arranged near the radiator 72 , and the second fan 73 blows natural wind toward the radiator 72 to achieve natural cooling of the coolant flowing through the radiator 72 .

[0062] In a preferred embodiment, see Figure 2 As shown, it also includes a first fluid replenishment tank 30 connected to the first thermal management loop 1 and the second thermal management loop 2, and the first fluid replenishment tank 30 is used to fill or replenish the coolant in the first thermal management loop 1 and the second thermal management loop 2.

[0063] In a preferred embodiment, see Figure 2 As shown, the second liquid replenishing tank 35 connected to the refrigerant circulation loop 3 is further included, and the refrigerant in the refrigerant circulation loop 3 is filled or replenished through the second liquid replenishing tank 35.

[0064] In one embodiment, a vehicle is provided, comprising a vehicle thermal management system with water-side hot gas bypass according to any of the aforementioned embodiments. The vehicle 1000 provided in this embodiment of the application may include, but is not limited to, an electric vehicle / electric vehicle (EV), a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), a new energy vehicle, and the like.

[0065] The vehicle thermal management system with water-side hot gas bypass function described in the present invention can meet different user usage scenarios, the main examples of which include:

[0066] 1) First mode, Figure 3 for Figure 2 Schematic diagram of the thermal management system in the first mode. Figure 3 As shown, the thermal management system of the present invention includes a first mode. In the first mode, the inlet r and outlet s of the first three-way proportional valve 8 are opened, the outlet t of the first three-way proportional valve 8 is closed, and the inlet u of the second three-way proportional valve 9 is closed. In other words, all heat in the coolant flow channel 22 of the second heat exchanger is transferred to the coolant flow channel 12 of the first heat exchanger via the branch pipe 4. At this time, the supercooled liquid refrigerant at the outlet of the refrigerant flow channel 31 of the second heat exchanger is throttled and expanded by the expansion valve 34 to obtain a low-temperature and low-pressure refrigerant (the low pressure is relatively high at this time, about 8 bar for R290 refrigerant and about 5 bar for R134a refrigerant, and the high low pressure can increase the refrigerant flow rate of the system). The low-temperature and low-pressure refrigerant exchanges heat with the coolant in the coolant flow channel 12 of the first heat exchanger, so that the refrigerant temperature at the outlet of the refrigerant flow channel 32 of the first heat exchanger rises rapidly, thereby ensuring that the refrigerant temperature at the compressor inlet reaches the preset value, and quickly increasing the compressor speed so that the compressor can run at a higher speed, thereby increasing the heating capacity of the thermal management system.

[0067] 2) Second mode, Figure 4 for Figure 2 Schematic diagram of the thermal management system in the first mode. Figure 4 As shown, the thermal management system of the present invention includes a second mode. In the second mode, the inlet r, outlet s, and outlet t of the first three-way proportional valve 8 are opened, the inlet x and outlet y of the third three-way proportional valve 10 are opened, and the inlet u and outlet z of the second three-way proportional valve 9 are closed. This splits the high-temperature coolant in the coolant flow channel 22 of the second heat exchanger into two paths: one path is delivered to the coolant flow channel 12 of the first heat exchanger via the branch pipe 4, and the other path is delivered to the heating core 51 of the air conditioning assembly 5 via the outlet y of the third three-way proportional valve 10, thereby meeting the heating requirements of the passenger compartment. By adjusting the opening ratio of the outlets s and t of the first three-way proportional valve 8, heat is released simultaneously to the coolant flow channel 12 of the first heat exchanger and the heating core 51, allowing the water-side hot gas to bypass the compressor to generate heat, thus meeting the heating requirements of the passenger compartment.

[0068] 3) The third mode, Figure 5 for Figure 2 Schematic diagram of the thermal management system in the first mode. Figure 5 As shown, the thermal management system of the present invention includes a second mode. In the second mode, the inlet r, outlet s, and outlet t of the first three-way proportional valve 8 are opened, the inlet x and outlet z of the third three-way proportional valve 10 are opened, the inlet u of the second three-way proportional valve 9 and the outlet y of the third three-way proportional valve 10 are closed, the inlet a of the multi-way valve 20 is connected to the outlet g, the inlet i of the multi-way valve 20 is connected to the outlet b, the inlet e of the multi-way valve 20 is connected to the outlet c, and the inlet d of the multi-way valve 20 is connected to the outlet f. In the third mode, the high-temperature coolant in the coolant flow channel 22 of the second heat exchanger is divided into two paths: one path is transferred to the coolant flow channel 12 of the first heat exchanger through the branch pipe 4, and the other path is transferred to the battery system 61 of the battery assembly 6 through the outlet z of the third three-way proportional valve 10 and the multi-way valve 20, meeting the heating requirements of the battery system 61. By adjusting the opening ratio of the liquid outlet s and the liquid outlet t of the first three-way proportional valve 8, heat is released to the coolant flow channel 12 of the first heat exchanger and the battery system at the same time, so that the water-side hot gas bypasses the compressor to create heat, thereby meeting the heating requirements of the battery system.

[0069] 4) The fourth mode, Figure 6 for Figure 2 Schematic diagram of the thermal management system in the first mode. Figure 6As shown, the thermal management system of the present invention includes a second mode. In the second mode, the liquid inlet r, liquid outlet s, and liquid outlet t of the first three-way proportional valve 8 are opened, the liquid inlet x, liquid outlet y, and liquid outlet z of the third three-way proportional valve 10 are opened, the liquid inlet u of the second three-way proportional valve 9 is closed, the liquid inlet a of the multi-way valve 20 is connected to the liquid outlet g, the liquid inlet i of the multi-way valve 20 is connected to the liquid outlet b, the liquid inlet e of the multi-way valve 20 is connected to the liquid outlet c, and the liquid inlet d of the multi-way valve 20 is connected to the liquid outlet f. In the third mode, the high-temperature coolant in the coolant flow channel 22 of the second heat exchanger is divided into two paths: one path is transferred to the coolant flow channel 12 of the first heat exchanger via the branch pipe 4, and the other path is transferred to the heating core 51 of the air conditioning assembly 5 via the liquid outlet y of the third three-way proportional valve 10, and then to the battery system 61 of the battery assembly 6 via the liquid outlet z of the third three-way proportional valve 10 and the multi-way valve 20, thereby simultaneously meeting the heating requirements of the passenger compartment and the battery system 61. By adjusting the opening ratio of the liquid outlet s and the liquid outlet t of the first three-way proportional valve 8, heat is simultaneously released to the coolant flow channel 12 of the first heat exchanger, the passenger compartment, and the battery system, thereby achieving heat generation by the water-side hot gas bypassing the compressor, thereby meeting the heating requirements of the passenger compartment and the battery system.

[0070] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A vehicle thermal management system, characterized in that: It comprises a first heat management circuit (1), a second heat management circuit (2) and a refrigerant circulation circuit (3); The first thermal management circuit (1) is provided with a first pump (11), a coolant flow channel (12) of a first heat exchanger, and a first thermal management object; The second thermal management circuit (2) is provided with a second pump (21), a coolant flow channel (22) of a second heat exchanger, and a second thermal management object; The refrigerant circulation circuit (3) is provided with a refrigerant flow channel (31) of a second heat exchanger and a refrigerant flow channel (32) of a first heat exchanger connected in series; A branch pipe (4) is connected between the liquid outlet of the coolant flow channel (22) of the second heat exchanger and the liquid inlet of the coolant flow channel (12) of the first heat exchanger, and a proportional control valve is connected to the branch pipe (4); The liquid outlet of the coolant flow channel (22) of the second heat exchanger is connected to the liquid inlet r of the first three-way proportional valve (8), the liquid outlet s of the first three-way proportional valve (8) is connected to the liquid inlet of the coolant flow channel (12) of the first heat exchanger, the liquid outlet t of the first three-way proportional valve (8) is connected to the first thermal management object, and the first three-way proportional valve (8) serves as a proportional control valve of the branch pipe (4); The first thermal management object includes a cooling core (52), a battery assembly (6), and an electric drive assembly (7) of the air-conditioning assembly (5); the second thermal management object includes a heating core (51), a battery assembly (6), and an electric drive assembly (7) of the air-conditioning assembly (5); It also includes a second three-way proportional valve (9), a third three-way proportional valve (10) and a multi-way valve (20), The liquid outlet of the coolant flow channel (12) of the first heat exchanger is connected to the liquid inlet u of the second three-way proportional valve (9), the liquid outlet v of the second three-way proportional valve (9) is connected to the liquid inlet a of the multi-way valve (20), and the liquid outlet w of the second three-way proportional valve (9) is connected to the refrigeration core (52) of the air conditioning assembly (5); The liquid outlet of the coolant flow channel (22) of the second heat exchanger is connected to the liquid inlet x of the third three-way proportional valve (10), the liquid outlet z of the third three-way proportional valve (10) is connected to the liquid inlet e of the multi-way valve (20), and the liquid outlet y of the third three-way proportional valve (10) is connected to the heating core (51) of the air conditioning assembly (5); The liquid outlet b of the multi-way valve (20) is connected to the liquid inlet of the coolant flow channel (12) of the first heat exchanger, and the liquid outlet f of the multi-way valve (20) is connected to the liquid inlet of the coolant flow channel (22) of the second heat exchanger; The two ends of the battery assembly (6) are respectively connected to the liquid outlet c and the liquid inlet d of the multi-way valve (20), and the two ends of the electric drive assembly (7) are respectively connected to the liquid outlet i and the liquid inlet h of the multi-way valve (20).

2. The vehicle thermal management system according to claim 1, characterized in that: The liquid outlet g of the multi-way valve (20) is connected to the liquid inlet of the radiator (72), and the liquid outlet of the radiator (72) is connected to the liquid inlet of the electric drive system (71) of the electric drive assembly (7).

3. The vehicle thermal management system according to claim 1, characterized in that: It also includes a first fluid replenishment tank (30) connected to the first thermal management circuit (1) and the second thermal management circuit (2).

4. The vehicle thermal management system according to claim 1, characterized in that: The refrigerant circulation circuit (3) is further provided with a compressor (33) and an expansion valve (34). The compressor (33) is connected between the liquid outlet of the refrigerant flow channel (32) of the first heat exchanger and the liquid inlet of the refrigerant flow channel (31) of the second heat exchanger. The expansion valve (34) is arranged at the liquid inlet position of the refrigerant flow channel (32) of the first heat exchanger.

5. The vehicle thermal management system according to claim 1, characterized in that: It also includes a second liquid replenishing tank (35) connected to the refrigerant circulation loop (3).

6. A vehicle, characterized in that: A vehicle thermal management system comprising the vehicle thermal management system according to any one of claims 1 to 5.

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