Electric vehicle thermal management system and electric vehicle

Abstract

The embodiment of the present invention provides an electric vehicle thermal management system and an electric vehicle, and relates to the field of thermal management systems. The electric vehicle thermal management system includes a cooling and heating module, an HVAC module, a front-end module, a power battery, a first water pump, a second water pump, a third water pump, a first switch water valve, a second switch water valve, a third switch water valve, a first proportional water valve, an electronic drive unit, an expansion kettle, and a second proportional water valve. The refrigerant circuit can be in a variety of states of heating, cooling, and dehumidifying the passenger compartment without changing the flow direction of the refrigerant, reducing the number of components of the refrigerant circuit, and the system control is simpler and more reliable. The electric vehicle includes the above-mentioned electric vehicle thermal management system, thereby reducing the number of components of the refrigerant circuit, and the system control is simpler and more reliable.

Description

Technical Field

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

[0002] At present, the development of electric vehicles is very rapid, and the market share is increasing rapidly. Electric vehicles achieve endurance and driving by storing electrical energy, so that users can charge and replenish energy directly at home. Compared with fuel vehicles, electric vehicles are not only beneficial to environmental protection, but also do not require users to refuel at gas stations, which greatly improves the convenience of users' lives. In the thermal management system of electric vehicles, electric compressors, heat exchangers, electronic water pumps, water valves, expansion valves, sensors, expansion kettles, electric heaters and other components are usually installed in various locations on the vehicle, and the components are connected by pipes. The thermal management system can ensure the comfort of the passenger compartment and the power battery is within a reasonable temperature range.

[0003] In the prior art, the refrigerant circuit of the thermal management system has a large number of components and the system control is complex. Summary of the invention

[0004] The present invention provides an electric vehicle thermal management system and an electric vehicle, which can reduce the number of components of a refrigerant circuit and make system control simpler and more reliable.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] An embodiment of the present invention provides an electric vehicle thermal management system, which includes a cooling and heating module, an HVAC module, a front-end module, a power battery, a first water pump, a second water pump, a third water pump, a first switch water valve, a second switch water valve, a third switch water valve, a first proportional water valve, an expansion kettle and a second proportional water valve, wherein the cooling and heating module includes an electric compressor, a water-cooled condenser, an electronic expansion valve and a plate heat exchanger connected in sequence, the HVAC module includes an evaporator, a heater core and a thermal expansion valve, the outlet end of the thermal expansion valve is connected to the inlet end of the evaporator, and the front-end module includes a first radiator;

[0007] The inlet end of the electronic expansion valve 130 and the inlet end of the thermal expansion valve 230 are connected in parallel to the refrigerant outlet end of the water-cooled condenser 120, and the outlet end of the evaporator is connected to the pipeline between the electric compressor and the water-cooled condenser;

[0008] The coolant outlet of the water-cooled condenser, the inlet of the third water pump and the third port of the third switch water valve are respectively connected to the first port, the second port and the third port of the second proportional water valve;

[0009] The pipeline between the third switch water valve and the first radiator, the coolant outlet of the plate heat exchanger, the second proportional water valve and the inlet of the third water pump are respectively connected to the first port, the second port and the third port of the first proportional water valve;

[0010] The coolant outlet of the power battery, the inlet of the second water pump, and the inlet of the first water pump are respectively connected to the first port, the second port, and the third port of the second switch water valve, and the pipeline between the inlet of the second water pump and the second port of the second switch water valve is the first pipeline;

[0011] The coolant outlet end of the heater core is connected to the first pipeline, and the connecting pipeline is the second pipeline. The coolant outlet end of the first radiator, the second pipeline, and the inlet end of the first water pump are respectively connected to the pipeline between the second switch water valve and the first port, the second port, and the third port of the first switch water valve;

[0012] The coolant inlet end of the first radiator, the coolant inlet end of the heater core, and the port of the second proportional water valve are respectively connected to the first port, the second port, and the third port of the third switch water valve;

[0013] The outlet end of the first water pump is connected to the coolant inlet end of the plate heat exchanger, the outlet end of the second water pump is connected to the coolant inlet end of the water-cooled condenser, and the outlet end of the third water pump is connected to the coolant inlet end of the power battery;

[0014] The expansion kettle is connected to the coolant pipeline of the electric vehicle thermal management system.

[0015] Optionally, the cooling and heating module further includes a liquid reservoir, and the refrigerant outlet end of the water-cooled condenser, the liquid reservoir and the inlet end of the electronic expansion valve are sequentially connected;

[0016] The inlet end of the electronic expansion valve and the inlet end of the thermal expansion valve are connected in parallel to the refrigerant outlet end of the accumulator.

[0017] Optionally, the water-cooled condenser, the liquid reservoir, the electronic expansion valve and the plate heat exchanger are integrated into one.

[0018] Optionally, the cooling and heating module also includes a gas-liquid separator, the refrigerant outlet end of the plate heat exchanger, the gas-liquid separator and the inlet end of the electric compressor are connected in sequence; the inlet end of the electronic expansion valve and the inlet end of the thermal expansion valve are connected in parallel to the refrigerant outlet end of the water-cooled condenser.

[0019] Optionally, the water-cooled condenser, the gas-liquid separator, the electronic expansion valve and the plate heat exchanger are integrated into one.

[0020] Optionally, the front-end module further includes a second radiator, and the first radiator and the second radiator are connected in series or in parallel.

[0021] Optionally, the electric vehicle thermal management system further includes an electronic drive unit, and the first port of the third switch water valve, the electronic drive unit and the coolant inlet end of the first radiator are connected in sequence.

[0022] Optionally, the electric vehicle thermal management system further includes a high-voltage electric heater, and the outlet end of the first water pump, the high-voltage electric heater and the coolant inlet end of the plate heat exchanger are connected in sequence.

[0023] Optionally, the expansion kettle is connected to a pipeline between the second water switch valve and the first water pump.

[0024] An embodiment of the present invention further provides an electric vehicle, comprising the above-mentioned electric vehicle thermal management system.

[0025] The beneficial effects of the electric vehicle thermal management system and the electric vehicle according to the embodiments of the present invention include, for example:

[0026] The refrigerant circuit of the electric vehicle thermal management system can operate in multiple states of heating, cooling and dehumidifying the passenger compartment without changing the flow direction of the entire refrigerant cycle. It has only two expansion valves (electronic expansion valve and thermal expansion valve), and no one-way valves and solenoid valves are used, which reduces the number of components in the refrigerant circuit and makes system control simpler and more reliable. In addition, the number of control valves in the refrigerant circuit is small, that is, the number of pipeline connection nodes is also small, the pipeline is simpler, and the risk of refrigerant leakage is reduced.

[0027] The electric vehicle includes the above-mentioned electric vehicle thermal management system, thereby reducing the number of components in the refrigerant circuit, making the system control simpler and more reliable, and can cover a variety of passenger compartment temperature and humidity requirements, as well as ensure the cooling and heating of the power battery, thereby ensuring the comfort and safety of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1It is a schematic diagram of a thermal management system for an electric vehicle provided in an embodiment of the present invention.

[0030] Icons: 1000-electric vehicle thermal management system; 100-cooling and heating module; 110-electric compressor; 120-water-cooled condenser; 130-electronic expansion valve; 140-liquid reservoir; 150-plate heat exchanger; 200-HVAC module; 210-evaporator; 220-heater core; 230-thermal expansion valve; 300-front-end module; 310-first radiator; 400-power battery; 11-first water pump; 12-second water pump; 13-third water pump; 21-first switch water valve; 22-second switch water valve; 23-third switch water valve; 31-first proportional water valve; 32-second proportional water valve; 40-first pipeline; 50-second pipeline; 500-electronic drive unit; 600-high-voltage electric heater; 700-expansion kettle. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] 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.

[0034] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0036] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0037] In the thermal management system of electric vehicles, electric compressors, heat exchangers, electronic water pumps, water valves, expansion valves, sensors, expansion kettles, electric heaters and other components are usually installed in various locations on the vehicle, and the components are connected by pipes. The thermal management system can ensure the comfort of the passenger compartment and the power battery is in a reasonable temperature range. In the prior art, the refrigerant circuit of the thermal management system has a large number of components, a large refrigerant charge, and complex system control. For example, in the prior art, the thermal management system needs to change the flow direction of the refrigerant during cooling and heating, so that six or more valves need to be arranged in the refrigerant circuit, the system control is complex, the refrigerant charge is large, and the cost is high.

[0038] In view of this, the electric vehicle thermal management system and the electric vehicle provided in the embodiments of the present invention can solve this problem to a great extent.

[0039] Please refer to Figure 1 , this embodiment provides an electric vehicle thermal management system 1000 and an electric vehicle, which will be described in detail below.

[0040] An embodiment of the present invention provides an electric vehicle, which includes an electric vehicle thermal management system 1000. The number of components of the refrigerant circuit in the electric vehicle thermal management system 1000 is smaller, the system control is simpler and more reliable, and the cost can be lower.

[0041] The electric vehicle thermal management system 1000 includes a cooling and heating module 100, an HVAC module 200, a front-end module 300, a power battery 400, a first water pump 11, a second water pump 12, a third water pump 13, a first switch water valve 21, a second switch water valve 22, a third switch water valve 23, a first proportional water valve 31, an expansion kettle 700 and a second proportional water valve 32. The cooling and heating module 100 includes an electric compressor 110, a water-cooled condenser 120, an electronic expansion valve 130, a plate heat exchanger 150, and an HVAC module 200. The AC module 200 includes an evaporator 210, a heater core 220 and a thermal expansion valve 230, the outlet end of the thermal expansion valve 230 is connected to the inlet end of the evaporator 210, the front end module 300 includes a first radiator 310, and the expansion kettle 700 is connected to the coolant pipeline of the electric vehicle thermal management system. Specifically, the expansion kettle 700 is respectively connected to the pipeline between the second switch water valve 22 and the first water pump 11, the first radiator 310, the first proportional water valve 31 and the third water pump 13, and the second pipeline 50.

[0042] The electric compressor 110 , the water-cooled condenser 120 , the electronic expansion valve 130 , the plate heat exchanger 150 , the evaporator 210 and the thermal expansion valve 230 together constitute a refrigerant circuit.

[0043] The inlet end of the electronic expansion valve 130 and the inlet end of the thermal expansion valve 230 are connected in parallel to the refrigerant outlet end of the water-cooled condenser 120. The outlet end of the evaporator 210 is connected to the pipeline between the electric compressor 110 and the water-cooled condenser 120. In order to completely cut off the coolant circuit, the thermal expansion valve 230 is a thermal expansion valve with a cut-off function (SO-TXV). Of course, in other embodiments, the thermal expansion valve 230 can also be replaced by an electronic expansion valve.

[0044] The coolant outlet of the water-cooled condenser 120, the inlet of the third water pump 13 and the third port of the third switch water valve 23 are respectively connected to the first port, the second port and the third port of the second proportional water valve 32, the pipeline between the third switch water valve 23 and the first radiator 310, the coolant outlet of the plate heat exchanger 150, the second proportional water valve 32 and the inlet of the third water pump 13 are respectively connected to the first port, the second port and the third port of the first proportional water valve 31, the coolant outlet of the power battery 400, the inlet of the second water pump 12 and the inlet of the first water pump 11 are respectively connected to the first port, the second port and the third port of the second switch water valve 22, and the pipeline between the inlet of the second water pump 12 and the second port of the second switch water valve 22 is the first pipeline 40;

[0045] The coolant outlet end of the heater core 220 is connected to the first pipeline 40, and the connecting pipeline is the second pipeline 50. The coolant outlet end of the first radiator 310, the second pipeline 50, and the inlet end of the first water pump 11 are respectively connected to the first port, the second port and the third port of the first switch water valve 21 through the pipeline between the second switch water valve 22. The coolant inlet end of the first radiator 310, the coolant inlet end of the heater core 220, and the first port of the second proportional water valve 32 are respectively connected to the first port, the second port and the third port of the third switch water valve 23. The outlet end of the first water pump 11 is connected to the coolant inlet end of the plate heat exchanger 150, the outlet end of the second water pump 12 is connected to the coolant inlet end of the water-cooled condenser 120, and the outlet end of the third water pump 13 is connected to the coolant inlet end of the power battery 400.

[0046] In this embodiment, the first switch water valve 21, the second switch water valve 22, and the third switch water valve 23 are all three-way water valves, the first proportional water valve 31 and the second proportional water valve 32 are both proportional three-way water valves, the first water pump 11, the second water pump 12, and the third water pump 13 are all electronic water pumps. Of course, in other embodiments, multiple three-way water valves of the coolant circuit can be integrated into one or several multi-way water valves to facilitate the product integrated design of the coolant circuit.

[0047] When the passenger compartment of the electric vehicle needs to be cooled and the power battery 400 needs to be cooled at the same time, at this time, the electronic expansion valve 130 and the thermal expansion valve 230 are both in the open state. In order to facilitate the refrigerant amount in the refrigerant circuit to adapt to different temperature state requirements, the cooling and heating module 100 also includes a liquid reservoir 140, and the refrigerant outlet end of the water-cooled condenser 120, the liquid reservoir 140 and the inlet end of the electronic expansion valve 130 are connected in sequence, and the inlet end of the electronic expansion valve 130 and the inlet end of the thermal expansion valve 230 are connected in parallel to the refrigerant outlet end of the liquid reservoir 140.

[0048] Of course, in other embodiments, the liquid storage tank 140 can also be a gas-liquid separator. In this case, the refrigerant outlet end of the plate heat exchanger 150, the gas-liquid separator and the inlet end of the electric compressor 110 are connected in sequence, and the inlet end of the electronic expansion valve 130 and the inlet end of the thermal expansion valve 230 are connected in parallel to the refrigerant outlet end of the water-cooled condenser 120, wherein the water-cooled condenser 120, the gas-liquid separator, the electronic expansion valve 130 and the plate heat exchanger 150 can be integrated into one.

[0049] The high-temperature and high-pressure gaseous refrigerant flowing out from the refrigerant outlet of the electric compressor 110 enters the water-cooled condenser 120, and the condensed high-temperature and high-pressure liquid refrigerant enters the liquid reservoir 140. The liquid refrigerant coming out of the liquid reservoir 140 is divided into two paths, one of which passes through the outlet of the electronic expansion valve 130 and enters the plate heat exchanger 150, and the other passes through the thermal expansion valve 230 and enters the evaporator 210. The refrigerant absorbs heat in the plate heat exchanger 150 and the evaporator 210 and changes into a superheated gas state. Finally, the refrigerant merges and enters the electric compressor 110. The fan blows the cold air cooled by the evaporator 210 into the vehicle, so that the passenger compartment is in a refrigerated state.

[0050] In order to facilitate the electric vehicle to recycle the heat of the motor drive and control unit, the electric vehicle thermal management system 1000 also includes an electronic drive unit 500 (electrical driver unit, EDU), which can include a motor drive and control unit. The first port of the third switch water valve 23, the electronic drive unit 500 and the coolant inlet end of the first radiator 310 are connected in sequence.

[0051] At this time, the high-temperature coolant flows out from the coolant outlet of the water-cooled condenser 120, enters the electronic drive unit 500 through the second proportional water valve 32 and the third switch water valve 23, and then enters the first radiator 310 to dissipate heat with the ambient air. The coolant cooled by the ambient air enters the second water pump 12 through the first switch water valve 21, and finally returns to the coolant inlet of the water-cooled condenser 120. In other embodiments, the front-end module 300 also includes a second radiator (not shown), and the first radiator 310 and the second radiator are connected in series or in parallel to meet a larger workload.

[0052] The low-temperature coolant flows out from the coolant outlet of the plate heat exchanger 150, passes through the first proportional water valve 31 and the third water pump 13, enters the power battery 400, and then cools the power battery 400, and then passes through the second switch water valve 22 and the first water pump 11, and finally returns to the coolant inlet of the plate heat exchanger 150.

[0053] In some cases, if the power battery 400 does not need forced cooling, the electronic expansion valve 130 can be closed. At this time, the refrigerant in the refrigerant circuit will not pass through the plate heat exchanger 150, and the coolant at the coolant outlet end of the plate heat exchanger 150 is no longer a low-temperature coolant.

[0054] When the passenger compartment of the electric vehicle needs to be heated and the power battery 400 needs to be heated at the same time, the electronic expansion valve 130 opens and closes the thermal expansion valve 230. At this time, the refrigerant in the refrigerant circuit no longer passes through the evaporator 210. The high-temperature and high-pressure gaseous refrigerant flowing out of the refrigerant outlet of the electric compressor 110 passes through the water-cooled condenser 120, the liquid storage tank 140 and the electronic expansion valve 130 in turn, and finally enters the plate heat exchanger 150 and then returns to the electric compressor 110.

[0055] At this time, the high-temperature coolant flows out from the coolant outlet end of the water-cooled condenser 120, and is divided into two paths through the second proportional water valve 32. One path passes through the third switch water valve 23 and enters the heater core 220. The air blows through the heater core 220 to absorb heat, and then the passenger compartment can be heated. The coolant passing through the heater core 220 flows to the first pipeline 40 through the second pipeline 50.

[0056] The other route enters the power battery 400 through the third water pump 13 to heat the power battery 400. The coolant flowing out of the power battery 400 flows into the first pipeline 40 after passing through the second switch water valve 22. The coolant in the first pipeline 40 and the second pipeline 50 merges and then returns to the coolant inlet end of the water-cooled condenser 120 through the second water pump 12. If the power battery 400 has no heating demand, the second proportional water valve 32 can close the pipeline connected to the power battery 400. The low-temperature coolant flows out from the coolant outlet end of the plate heat exchanger 150, enters the electronic drive unit 500 through the first proportional water valve 31, then flows through the first radiator 310, passes through the first switch water valve 21 and the first water pump 11 to enter the high-voltage electric heater 600, and finally returns to the coolant inlet end of the plate heat exchanger 150.

[0057] For example, in a low-temperature environment in winter, the low-temperature coolant flows through the electronic drive unit 500, which can recycle the waste heat of the electronic drive unit 500, improve the heating effect of the passenger compartment, and save energy. When the power battery 400 has no heating demand and there is heat that can be recycled, the first proportional water valve 31 can be adjusted to divide a portion of the coolant through the power battery 400, and then enter the high-voltage electric heater 600 through the second switch water valve 22 and the first water pump 11, and finally return to the plate heat exchanger 150. It is easy to understand that at this time, the first pipeline 40 between the second switch water valve 22 and the second water pump 12 is in a disconnected state. In this way, when the passenger compartment is heated, the waste heat of the electronic drive unit 500 and the waste heat of the power battery 400 can be accurately recovered respectively, further saving energy.

[0058] It should be noted that in order to ensure that the electric vehicle thermal management system 1000 can be used normally at a lower temperature, the electric vehicle thermal management system 1000 may also include a high-voltage electric heater 600, and the outlet end of the first water pump 11, the high-voltage electric heater 600 and the coolant inlet end of the plate heat exchanger 150 are connected in sequence.

[0059] When the passenger compartment of the electric vehicle needs to be dehumidified and the power battery 400 needs forced cooling, the electronic expansion valve 130 and the thermal expansion valve 230 are both in an open state, and the refrigerant flow direction of the refrigerant circuit is the same as the flow direction of the circuit when the passenger compartment needs to be cooled. Of course, if the power battery 400 does not need forced cooling, the electronic expansion valve 130 is closed.

[0060] At this time, the circulation loop of the coolant is as follows: the high-temperature coolant flows out of the water-cooled condenser 120, passes through the second proportional water valve and the third switch water valve 23, enters the heater core 220, and then passes through the second pipeline 50 and the second water pump 12 to return to the water-cooled condenser 120. The low-temperature coolant flows out of the plate heat exchanger 150, passes through the first proportional water valve 31 and is divided into two paths. One path enters the electronic drive unit 500, then flows through the first radiator 310, and passes through the first switch water valve 21; the other path passes through the third water pump 13 and enters the power battery 400, then passes through the second switch water valve 22, and the two paths of coolant merge into the first water pump 11, enter the high-voltage electric heater 600, and finally return to the plate heat exchanger 150. By simultaneously starting the heater core 220 and the evaporator 210 in the HVAC module 200, the dehumidification work in the passenger compartment is realized.

[0061] Of course, if there is no forced cooling requirement for the power battery 400 , the first proportional water valve 31 can close the pipeline leading to the power battery 400 .

[0062] In this embodiment, the water-cooled condenser 120, the liquid storage tank 140, the electronic expansion valve 130 and the plate heat exchanger 150 can be integrated into one module to reduce the use of refrigerant pipelines.

[0063] The electric vehicle thermal management system 1000 and the electric vehicle provided in this embodiment have at least the following advantages:

[0064] The refrigerant circuit of the electric vehicle thermal management system 1000 can be used in multiple states of heating, cooling and dehumidifying the passenger compartment without changing the flow direction of the entire refrigerant cycle. There are only two expansion valves (electronic expansion valve 130 and thermal expansion valve 230), and no one-way valve or solenoid valve is used, which reduces the number of parts in the refrigerant circuit and makes the system control simpler and more reliable. At the same time, the water-cooled condenser 120, the liquid storage tank 140, the electronic expansion valve 130 and the plate heat exchanger 150 can be integrated into a module, and there is no need to use an external heat exchanger, which reduces the refrigerant charge of the electric vehicle thermal management system 1000 and greatly saves costs.

[0065] In addition, the number of control valves in the refrigerant circuit is smaller, that is, the number of pipeline connection nodes is also smaller, the pipeline is simpler, and the risk of refrigerant leakage is reduced.

[0066] The electric vehicle thermal management system 1000 can respectively realize accurate recovery of waste heat of the electronic drive unit 500 and waste heat of the power battery 400, further saving energy consumption. The waste heat recovery of the electronic drive unit 500 and the waste heat of the power battery 400 can be performed separately or simultaneously, thereby improving the waste heat utilization efficiency and control accuracy.

[0067] The electric vehicle reduces the number of components in the refrigerant circuit, and the system control is simpler and more reliable. At the same time, it can cover various passenger compartment temperature and humidity requirements, and ensure the cooling and heating of the power battery 400, thereby ensuring the comfort and safety of the electric vehicle.

[0068] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A thermal management system for an electric vehicle, characterized in that: The invention comprises a cooling and heating module (100), an HVAC module (200), a front-end module (300), a power battery (400), a first water pump (11), a second water pump (12), a third water pump (13), a first switch water valve (21), a second switch water valve (22), a third switch water valve (23), a first proportional water valve (31), an expansion kettle (700) and a second proportional water valve (32); the cooling and heating module (100) comprises an electric compressor (110), a water-cooled condenser (120), an electronic expansion valve (130) and a plate heat exchanger (150) which are connected in sequence; the HVAC module (200) comprises an evaporator (210), a heating core (220) and a thermal expansion valve (230); an outlet end of the thermal expansion valve (230) is connected to an inlet end of the evaporator (210); and the front-end module (300) comprises a first radiator (310); The inlet end of the electronic expansion valve (130) and the inlet end of the thermal expansion valve (230) are connected in parallel to the refrigerant outlet end of the water-cooled condenser (120), and the outlet end of the evaporator (210) is connected to the pipeline between the electric compressor (110) and the water-cooled condenser (120); The coolant outlet of the water-cooled condenser (120), the inlet of the third water pump (13) and the third port of the third switch water valve (23) are respectively connected to the first port, the second port and the third port of the second proportional water valve (32); The coolant outlet of the power battery (400), the inlet of the second water pump (12), and the inlet of the first water pump (11) are respectively connected to the first port, the second port, and the third port of the second switch water valve (22); the pipeline between the inlet of the second water pump (12) and the second port of the second switch water valve (22) is the first pipeline (40); The coolant outlet end of the heater core (220) is connected to the first pipeline (40), and the connecting pipeline is the second pipeline (50); the coolant outlet end of the first radiator (310), the second pipeline (50), the inlet end of the first water pump (11) and the pipeline between the second switch water valve (22) are respectively connected to the first port, the second port and the third port of the first switch water valve (21); The coolant inlet end of the first radiator (310), the coolant inlet end of the heater core (220), and the first port of the second proportional water valve (32) are respectively connected to the first port, the second port, and the third port of the third switch water valve (23); The pipeline between the third switch water valve (23) and the first radiator (310), the coolant outlet of the plate heat exchanger (150), and the pipeline between the second proportional water valve (32) and the inlet of the third water pump (13) are respectively connected to the first port, the second port and the third port of the first proportional water valve (31); The outlet end of the first water pump (11) is connected to the coolant inlet end of the plate heat exchanger (150), the outlet end of the second water pump (12) is connected to the coolant inlet end of the water-cooled condenser (120), and the outlet end of the third water pump (13) is connected to the coolant inlet end of the power battery (400); The expansion kettle (700) is connected to the coolant pipeline of the electric vehicle thermal management system.

2. The electric vehicle thermal management system according to claim 1, characterized in that: The cooling and heating module (100) further comprises a liquid reservoir (140), and the refrigerant outlet end of the water-cooled condenser (120), the liquid reservoir (140) and the inlet end of the electronic expansion valve (130) are sequentially connected; The inlet end of the electronic expansion valve (130) and the inlet end of the thermal expansion valve (230) are connected in parallel to the refrigerant outlet end of the liquid accumulator (140).

3. The electric vehicle thermal management system according to claim 2, characterized in that: The water-cooled condenser (120), the liquid storage device (140), the electronic expansion valve (130) and the plate heat exchanger (150) are integrated into one body.

4. The electric vehicle thermal management system according to claim 1, characterized in that: The cooling and heating module (100) further comprises a gas-liquid separator, and the refrigerant outlet end of the plate heat exchanger (150), the gas-liquid separator and the inlet end of the electric compressor (110) are sequentially connected; The inlet end of the electronic expansion valve (130) and the inlet end of the thermal expansion valve (230) are connected in parallel to the refrigerant outlet end of the water-cooled condenser (120).

5. The electric vehicle thermal management system according to claim 4, characterized in that: The water-cooled condenser (120), the gas-liquid separator, the electronic expansion valve (130) and the plate heat exchanger (150) are integrated into one body.

6. The electric vehicle thermal management system according to claim 1, characterized in that: The expansion kettle (700) is connected to the pipeline between the second water switch valve (22) and the first water pump (11).

7. The electric vehicle thermal management system according to claim 1, characterized in that: The front-end module (300) further comprises a second radiator, and the first radiator (310) and the second radiator are connected in series or in parallel.

8. The electric vehicle thermal management system according to claim 1, characterized in that: The electric vehicle thermal management system further comprises an electronic drive unit (500), and the first port of the third water switch valve (23), the electronic drive unit (500) and the coolant inlet end of the first radiator (310) are sequentially connected.

9. The electric vehicle thermal management system according to claim 1, characterized in that: The electric vehicle thermal management system further comprises a high-voltage electric heater (600), and the outlet end of the first water pump (11), the high-voltage electric heater (600) and the coolant inlet end of the plate heat exchanger (150) are connected in sequence.

10. An electric vehicle, characterized in that: The electric vehicle thermal management system comprises the thermal management system according to any one of claims 1 to 9.

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