Heat pump refrigerant circulation device and electric vehicle thermal management system

Abstract

The present application relates to a kind of heat pump refrigerant circulation device and electric vehicle thermal management system, electric vehicle thermal management system includes waterway circulation system and heat pump refrigerant circulation device, heat pump refrigerant circulation device includes: air conditioning circulation system and liquid cooling condenser;The air conditioning circulation system includes the refrigerant side of the cooler, electric compressor, external condenser, liquid reservoir and air conditioner box evaporator in parallel with the refrigerant side of the cooler in turn through refrigerant pipeline series connection;The refrigerant side of the liquid cooling condenser is connected with the external condenser in parallel through the refrigerant pipeline;The waterway circulation system includes air conditioner box warm air, warm air water pump and the waterway side of the liquid cooling condenser, the waterway side of the liquid cooling condenser is connected with the air conditioner box warm air, the warm air water pump in turn by waterway communication.The cooler is arranged, so that the heat can be absorbed indirectly by the cooler of non-heat pump air conditioning circulation system, improves the heating efficiency of whole vehicle, reduces the consumption of energy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicle thermal management, and particularly relates to a heat pump refrigerant circulating device and an electric vehicle thermal management system. BACKGROUND

[0002] The main task of the thermal management system of an electric vehicle is to provide air conditioning refrigeration or warm air heating for the passengers in the cabin, and to ensure that the electrical systems such as the battery pack and the drive motor system work within a reasonable temperature range. However, the thermal management system of the electric vehicle in the prior art is quite different from the thermal management system of a traditional fuel vehicle.

[0003] The existing battery thermal management methods of the electric vehicle mainly include the following:

[0004] 1. Only direct cooling mode is used without heating function;

[0005] 2. Direct cooling and air heating modes are used. Since the air heating mode has a small heat exchange coefficient, a small heat capacity, and a slow temperature rising speed, it is not conducive to the rapid temperature control of the power battery. Moreover, the heating module and the fan are directly placed in the battery pack, which can easily cause thermal runaway and increase the use risk.

[0006] 3. Liquid heating mode is used, but the heat source generally uses PTC, which is only suitable for mild low-temperature environments. Moreover, excessive consumption of the battery pack power can increase the energy consumption of the whole vehicle, greatly reduce the system efficiency, and greatly reduce the driving range.

[0007] Therefore, it is necessary to provide a thermal management system which saves energy consumption, has a simple refrigerant circulating system structure, and reduces manufacturing cost to solve the above technical problems. SUMMARY

[0008] In order to solve the above technical problems, the present application provides an electric vehicle thermal management system. The problem that the heat source of the electric vehicle in the prior art uses PTC to excessively consume the power of the battery pack, which increases the energy consumption of the whole vehicle and greatly reduces the driving range, is solved.

[0009] The technical effects of the present application are achieved as follows:

[0010] A heat pump refrigerant circulating device, comprising: an air conditioning circulating system and a liquid cooling condenser;

[0011] The air conditioning circulating system comprises a cooler, an electric compressor, an external condenser, a liquid accumulator, and an air conditioning box evaporator. The refrigerant side of the cooler is connected in series with the electric compressor, the external condenser, and the liquid accumulator through refrigerant pipelines. The air conditioning box evaporator is connected in parallel with the refrigerant side of the cooler.

[0012] The refrigerant side of the liquid cooling condenser is connected in parallel with the external condenser through a refrigerant pipeline.

[0013] Further, the air conditioning circulation system further comprises a refrigerant solenoid valve and a check valve.

[0014] The refrigerant solenoid valve is communicated between the electric compressor and the inlet of the external condenser.

[0015] The check valve is communicated between the liquid accumulator and the outlet of the external condenser. By adding an external condenser in series on the high-pressure side of the air conditioning circulation system of a traditional fuel vehicle, adding a refrigerant solenoid valve at the inlet of the external condenser, and adding a check valve at the outlet of the external condenser, a heat pump refrigerant circulation device is formed, which reduces the use of components, reduces the complexity of the heat pump refrigerant circulation device, saves development costs, and shortens the development cycle.

[0016] In addition, an electric vehicle thermal management system is also provided, which comprises a water circulation system and the heat pump refrigerant circulation device, the water circulation system comprises an air conditioning box heater, a heater water pump, and a water circuit side of the liquid cooling condenser, and the water circuit side of the liquid cooling condenser is communicated with the air conditioning box heater and the heater water pump in sequence through a water circuit. By arranging the water circuit side of the liquid cooling condenser to be communicated with the air conditioning box heater through a water circuit, the heat pump heating function of the passenger cabin is realized, and the condenser inside the air conditioning box is omitted.

[0017] Further, the water circulation system further comprises a PTC, which is communicated between the liquid cooling condenser and the air conditioning box heater.

[0018] Further, the water circulation system further comprises a first two-way water valve, which is connected in parallel with the air conditioning box heater.

[0019] Further, the water circulation system further comprises a first four-way water valve, a second four-way water valve, a power battery, and a battery water pump, the second port of the first four-way water valve is communicated with the water inlet of the first two-way water valve, the water outlet of the first two-way water valve is communicated with the fourth port of the second four-way water valve, the second port of the second four-way water valve is communicated with the water inlet of the battery water pump, the water outlet of the battery water pump is communicated with the negative electrode of the power battery, and the positive electrode of the power battery is communicated with the fourth port of the first four-way water valve.

[0020] Further, the water circulation system further comprises a first three-way water valve, the first water inlet of the first three-way water valve is communicated with the air conditioning box heater, the second water inlet of the first three-way water valve is communicated with the PTC, and the water outlet of the first three-way water valve is communicated with the fourth port of the second four-way water valve.

[0021] Further, the water circulation system further comprises an ADAS system and a second two-way water valve, the second two-way water valve is communicated between the positive electrode of the power battery and the fourth port of the first four-way water valve, and the ADAS system and the second two-way water valve are connected in parallel.

[0022] Further, the water circulation system further comprises a motor system and a motor water pump, the third port of the second four-way water valve and the water inlet of the motor water pump are communicated, the water outlet of the motor water pump and the water inlet of the motor system are communicated, the water outlet of the motor system and the first port of the first four-way water valve are communicated, and the water circuit side of the cooler is communicated between the third port of the first four-way water valve and the first port of the second four-way water valve. By communicating the water circuit side of the liquid-cooled condenser with the water circuit and the motor system, the heat pump heating function of the motor system is realized.

[0023] Further, the water circulation system further comprises a low-temperature radiator and a second three-way water valve, the low-temperature radiator and the second three-way water valve are communicated between the third port of the second four-way water valve and the motor system, the third port of the second four-way water valve and the water inlet of the second three-way water valve are communicated, the first water outlet of the second three-way water valve and one end of the low-temperature radiator are communicated, and the motor system and the second water outlet of the second three-way water valve are respectively communicated with the other end of the low-temperature radiator. By communicating the water circuit side of the cooler with the motor system and the low-temperature radiator, the electric drive waste heat generated by the electric vehicle during driving and the air obtained from the air by the low-temperature radiator can be indirectly absorbed by the cooler, so that the heat pump heating function of the passenger compartment and the heat pump heating function of the battery are realized.

[0024] As described above, the present application has the following beneficial effects:

[0025] 1) By connecting an external condenser in series on the high-pressure side of the air conditioning circulation system of a traditional fuel vehicle, adding a refrigerant electromagnetic valve at the inlet of the external condenser, and adding a one-way valve at the outlet of the external condenser, a heat pump refrigerant circulation device is formed, which reduces the use of components, reduces the complexity of the heat pump refrigerant circulation device, saves development costs, and shortens the development cycle.

[0026] 2) By communicating the water circuit side of the cooler with the motor system and the low-temperature radiator, the electric drive waste heat generated by the electric vehicle during driving and the air obtained from the air by the low-temperature radiator can be indirectly absorbed by the cooler, so that the heat pump heating function of the passenger compartment and the heat pump heating function of the battery are realized.

[0027] 3) By communicating the water circuit side of the liquid-cooled condenser with the water circuit and the air conditioning box warm air, the heat pump heating function of the passenger compartment is realized, and the condenser inside the air conditioning box is saved.

[0028] 4) The water circuit of the liquid-cooled condenser is connected with the motor system through the water circuit, so as to realize the heat pump heating function of the motor system. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 A structure schematic diagram of a heat pump refrigerant circulating device provided for the embodiments of the present application;

[0031] Figure 2 A structure schematic diagram of an electric vehicle thermal management system provided for the embodiments of the present application;

[0032] Figure 3 A structure schematic diagram of an electric vehicle thermal management system in refrigeration provided for the embodiments of the present application;

[0033] Figure 4 A structure schematic diagram of an electric vehicle thermal management system in heating by the first mode provided for the embodiments of the present application;

[0034] Figure 5 A structure schematic diagram of an electric vehicle thermal management system in heating by the second mode provided for the embodiments of the present application.

[0035] In the drawings, the reference signs correspond to:

[0036] Air conditioning circulating system 1, liquid-cooled condenser 2, cooler 3, electric compressor 4, external condenser 5, liquid accumulator 6, air conditioning box evaporator 7, refrigerant electromagnetic valve 8, one-way valve 9, water circuit circulating system 10, air conditioning box air heater 11, air heater water pump 12, PTC 13, first two-way water valve 14, first four-way water valve 15, second four-way water valve 16, power battery 17, battery water pump 18, first three-way water valve 19, ADAS system 20, second two-way water valve 21, motor system 22, motor water pump 23, low-temperature radiator 24, second three-way water valve 25, throttling device 26, electronic expansion valve 27. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0038] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] Example 1:

[0040] like Figure 1 As shown, the embodiment of this specification provides a heat pump refrigerant circulation device, including: an air conditioning circulation system 1 and a liquid-cooled condenser 2;

[0041] The air conditioning circulation system 1 includes a cooler 3, an electric compressor 4, an external condenser 5, a liquid reservoir 6 and an air conditioning box evaporator 7. The refrigerant side of the cooler 3 is connected in series with the electric compressor 4, the external condenser 5 and the liquid reservoir 6 through a refrigerant pipeline, and the air conditioning box evaporator 7 is connected in parallel with the refrigerant side of the cooler 3.

[0042] The refrigerant side of the liquid-cooled condenser 2 is connected in parallel with the external condenser 5 through a refrigerant pipeline.

[0043] Among them, the cooler 3 is used for heat exchange, the refrigerant side of the cooler 3 is used to pass the refrigerant, and the water side of the cooler 3 is used to pass the coolant. Heat exchange is performed between the refrigerant and the coolant to achieve the purpose of cooling the coolant or recovering heat in the coolant.

[0044] Preferably, the air conditioning circulation system 1 further includes: a refrigerant solenoid valve 8 and a one-way valve 9; the refrigerant solenoid valve 8 is connected between the electric compressor 4 and the inlet of the external condenser 5; the one-way valve 9 is connected between the liquid reservoir 6 and the outlet of the external condenser 5.

[0045] The heat pump refrigerant circulation device is formed by connecting an external condenser 5 in series on the basis of the air conditioning circulation system of the traditional fuel vehicle, adding a refrigerant electromagnetic valve 8 at the inlet of the external condenser 5, and adding a one-way valve 9 at the outlet of the external condenser 5, which reduces the use of components, reduces the complexity of the heat pump refrigerant circulation device, saves development costs, and shortens the development cycle.

[0046] Embodiment 2:

[0047] As shown in Figures 2-5 The embodiment of the present application provides an electric vehicle thermal management system, which comprises a water circulation system 10 and the heat pump refrigerant circulation device in the embodiment 1, the water circulation system 10 comprises an air conditioner box heater 11, a heater water pump 12 and a water side of the liquid cooling condenser 2, and the water side of the liquid cooling condenser 2 is communicated with the air conditioner box heater 11 and the heater water pump 12 in sequence through a water circuit. Figures 2-5 The solid line in the figure represents the flow of refrigerant or water, and the dashed line represents no flow of refrigerant or water.

[0048] It should be noted that in the prior art, the passenger cabin heat pump heating directly absorbs heat from the air through the external condenser as the heat source of the heat pump, and the air conditioner box adopts a three-core structure of an evaporator, an internal condenser and a heater, so that the refrigerant system of the electric vehicle needs to be provided with several control valves more than the refrigerant system of the traditional fuel vehicle, the pipe circuit of the refrigerant system is complex, and too many components are used; in winter, the battery heating is directly performed by using a PTC electric heating, instead of using air heating, so that the energy consumption is too high.

[0049] Therefore, the water side of the cooler 3 is communicated with the motor system 22 and the low-temperature radiator 24, the electric drive waste heat generated by the electric vehicle during driving and the air obtained from the air by the low-temperature radiator 24 can be indirectly absorbed by the cooler 3, so that the functions of the passenger cabin heat pump heating and the battery heat pump heating are realized; the water side of the liquid cooling condenser 2 is connected with the air conditioner box heater 11 through a water circuit, so that the function of the passenger cabin heat pump heating is realized, and the internal condenser of the air conditioner box of the traditional fuel vehicle in the prior art is omitted; the water side of the liquid cooling condenser 2 is also connected with the power battery 17 through a water circuit, so that the functions of the passenger cabin heat pump heating and the battery heat pump heating in winter, the passenger cabin refrigeration and the battery cooling in summer, the passenger cabin dehumidification and the battery cooling in spring and autumn, and the low-temperature radiator deicing in winter are realized.

[0050] Preferably, the water circulation system 10 further comprises a PTC 13, which is connected between the liquid cooling condenser 2 and the air conditioner box heater 11. By arranging the PTC 13, the PTC 13 can be used to provide a heat source for the passenger cabin or the power battery 17 during winter heating.

[0051] Preferably, the water circuit circulation system 10 further comprises a first two-way water valve 14, and the first two-way water valve 14 and the air conditioning box heater 11 are connected in parallel.

[0052] Specifically, by setting the first two-way water valve 14, when the water circuit side of the liquid-cooled condenser 2 and the second port of the first four-way water valve 15, the fourth port of the second four-way water valve 16 are not connected, the water circuit circulation can be formed by connecting the branch of the first two-way water valve 14 and the branch of the power battery 17, and the cooling function of the ADAS 20 and the power battery 17 can be realized.

[0053] Preferably, the water circuit circulation system 10 further comprises a first four-way water valve 15, a second four-way water valve 16, a power battery 17 and a battery water pump 18, the second port of the first four-way water valve 15 and the water inlet of the first two-way water valve 14 are connected, the water outlet of the first two-way water valve 14 and the fourth port of the second four-way water valve 16 are connected, the second port of the second four-way water valve 16 and the water inlet of the battery water pump 18 are connected, the water outlet of the battery water pump 18 and the negative electrode of the power battery 17 are connected, and the positive electrode of the power battery 17 and the fourth port of the first four-way water valve 15 are connected. Figure 2 The circles 1, 2, 3 and 4 marked beside the first four-way water valve 15 in the first four-way water valve 15 are respectively the first port, the second port, the third port and the fourth port of the first four-way water valve 15; Figure 2 The circles 1, 2, 3 and 4 marked beside the second four-way water valve 16 in the second four-way water valve 16 are respectively the first port, the second port, the third port and the fourth port of the second four-way water valve 16.

[0054] Specifically, by setting the first four-way water valve 15 and the second four-way water valve 16, when refrigerating, the first port and the second port of the first four-way water valve 15 are connected, the third port and the fourth port are connected, the first port and the second port of the second four-way water valve 16 are connected, and the third port and the fourth port are connected, so that the branch of the power battery 17 and the water circuit side of the cooler 3 are connected, and the cooling of the power battery 17 is realized.

[0055] When heating by electric drive waste heat and heat absorption in air, the first port and the third port of the first four-way water valve 15 are connected, the second port and the fourth port are connected, the first port and the third port of the second four-way water valve 16 are connected, the second port and the fourth port are connected, so that the branch of the power battery 17 and the water circuit side of the liquid-cooled condenser 2 are connected, and the heating of the power battery 17 and the passenger compartment is realized.

[0056] Preferably, the water circuit circulation system 10 further comprises a first three-way water valve 19, the first water inlet of the first three-way water valve 19 and the air conditioning box heater 11 are connected, the second water inlet of the first three-way water valve 19 and the PTC 13 are connected, and the water outlet of the first three-way water valve 19 and the fourth port of the second four-way water valve 16 are connected.Figure 2 The circle 1 beside the first three-way water valve 19 in the figure is the first water inlet of the first three-way water valve 19, and the circle 2 beside the first three-way water valve 19 is the second water inlet of the first three-way water valve 19.

[0057] Preferably, the water circulation system 10 further comprises an ADAS system 20 and a second two-way water valve 21, the second two-way water valve 21 is connected between the positive electrode of the power battery 17 and the fourth port of the first four-way water valve 15, and the ADAS system 20 and the second two-way water valve 21 are connected in parallel.

[0058] Preferably, the water circulation system 10 further comprises a motor system 22 and a motor water pump 23, the third port of the second four-way water valve 16 and the water inlet of the motor water pump 23 are connected, the water outlet of the motor water pump 23 and the water inlet of the motor system 22 are connected, the water outlet of the motor system 22 and the first port of the first four-way water valve 15 are connected, and the water circuit side of the liquid cooling condenser 2 is connected between the third port of the first four-way water valve 15 and the first port of the second four-way water valve 16. By setting the water circuit side of the liquid cooling condenser 2 to be connected to the water circuit and the motor system 22, the heat pump heating function of the motor system 22 is realized.

[0059] Specifically, the motor system 22 comprises a front motor, a charging motor and a rear motor, the front motor is used to drive the front wheels of the electric vehicle, the rear motor is used to drive the rear wheels of the electric vehicle, and the charging motor is used to charge the power battery 17.

[0060] Preferably, the water circulation system 10 further comprises a low-temperature radiator 24 and a second three-way water valve 25, the low-temperature radiator 24 and the second three-way water valve 25 are connected between the third port of the second four-way water valve 16 and the motor system 22, the third port of the second four-way water valve and the water inlet of the second three-way water valve 25 are connected, the first water outlet of the second three-way water valve 25 and one end of the low-temperature radiator 24 are connected, and the motor system 22 and the second water outlet of the second three-way water valve 25 are respectively connected to the other end of the low-temperature radiator 24. Figure 2 The circle 1 beside the second three-way water valve 25 in the figure is the first water outlet of the second three-way water valve 25, and the circle 2 beside the second three-way water valve 25 is the second water outlet of the second three-way water valve 25.

[0061] Specifically, as shown in Figure 3 When cooling in summer, the first port and the second port of the first four-way water valve 15 are connected, the third port and the fourth port of the first four-way water valve 15 are connected, the first port and the second port of the second four-way water valve 16 are connected, the third port and the fourth port of the second four-way water valve 16 are connected, and the water circuit side of the liquid cooling condenser 2 is not connected to the second port of the first four-way water valve 15 and the fourth port of the second four-way water valve 16. At this time, the branch where the power battery 17 is located is connected to the water circuit of the cooler 3 for cooling.

[0062] The throttling device 26 of the branch where the air-conditioning box evaporator 7 is located is opened, and the electronic expansion valve 27 of the branch where the cooler 3 is located is opened, so that the cooling of the power battery 17 and the cooling of the passenger compartment can be carried out simultaneously; the throttling device 26 can also be closed, and only the power battery 17 is cooled accordingly.

[0063] The passenger compartment is cooled by the operation of the air-conditioning box evaporator 7 .

[0064] Specifically, when heating in winter, there are two implementation methods:

[0065] In one embodiment, Figure 4 As shown, when absorbing heat from electric drive waste heat and air to heat the passenger compartment and power battery 17, the first port and the third port of the first four-way water valve 15 are connected, the second port and the fourth port of the first four-way water valve 15 are connected, the first port and the third port of the second four-way water valve 16 are connected, the second port and the fourth port of the second four-way water valve 16 are connected, the one-way valve 9 is closed, the throttling device 26 of the branch where the air-conditioning box evaporator 7 is located is closed, and the first two-way water valve 14 is closed to connect the water side of the liquid-cooled condenser 2 with the second port of the first four-way water valve 15 and the fourth port of the second four-way water valve 16, so that the water flow rate can be distributed through the first three-way water valve 19 to control the start and heating temperature of the passenger compartment and power battery 17; when the electric drive waste heat is sufficient, the water does not flow through the low-temperature radiator 24; when the electric drive waste heat is insufficient, the second water outlet of the second three-way water valve 25 is closed, and the water can partially or completely flow through the low-temperature radiator 24 to absorb heat from the air for heating. At this time, the branch where the power battery 17 is located is connected to the water side of the liquid-cooled condenser 2 for heating.

[0066] The electric drive waste heat is generated by the front motor, charger and rear motor in the motor system 22 , and the passenger compartment is heated by operating the air conditioner heater 11 .

[0067] In another embodiment, Figure 5 As shown, when absorbing heat from the power battery 17 to heat the passenger compartment, the first two-way water valve 14 is opened to disconnect the water channel side of the liquid-cooled condenser 2 from the second port of the first four-way water valve 15 and the fourth port of the second four-way water valve 16, the one-way valve 9 is closed, and the throttling device 26 of the branch where the air-conditioning box evaporator 7 is located is closed. At this time, the air-conditioning box heater 11 heats the passenger compartment by absorbing heat from the power battery 17. This situation is applicable to the case where the temperature of the power battery 17 itself is relatively high, such as when the power battery 17 has just been fast-charged or when the power battery 17 uses heat storage.

[0068] Although the present invention has been described through preferred embodiments, the present invention is not limited to the embodiments described herein but includes various changes and modifications that may be made without departing from the scope of the present invention.

[0069] In this article, the front, back, up, down and other orientation words are defined by the position of the parts in the drawing and the position of the parts relative to each other in the drawing, only to express the clarity and convenience of the technical scheme. It should be understood that the use of the orientation words should not limit the scope of the application.

[0070] In the case of no conflict, the above-mentioned embodiments and features in the embodiments can be combined with each other.

[0071] The above disclosure is only a preferred embodiment of the application, and of course cannot limit the scope of the application. Therefore, equivalent changes made according to the claims of the application are still within the scope of the application.

Claims

1. An electric vehicle thermal management system, characterized by, The application relates to a water circulation system (10) and a heat pump refrigerant circulation device, wherein the heat pump refrigerant circulation device comprises an air conditioner circulation system (1) and a liquid cooling condenser (2). The air conditioner circulation system (1) comprises a cooler (3), an electric compressor (4), an external condenser (5), a liquid accumulator (6) and an air conditioner box evaporator (7), the refrigerant side of the cooler (3) is connected with the electric compressor (4), the external condenser (5) and the liquid accumulator (6) in sequence through a refrigerant pipeline, and the air conditioner box evaporator (7) is connected with the refrigerant side of the cooler (3) in parallel. The refrigerant side of the liquid cooling condenser (2) is connected with the external condenser (5) in parallel through a refrigerant pipeline. The water circulation system (10) comprises an air conditioner box air heater (11), an air heater water pump (12) and the water side of the liquid cooling condenser (2), the water side of the liquid cooling condenser (2) is connected with the air conditioner box air heater (11) and the air heater water pump (12) in sequence through a water pipeline. The water circulation system (10) further comprises a first two-way water valve (14), the first two-way water valve (14) is connected with the air conditioner box air heater (11) in parallel, the water circulation system (10) further comprises a first four-way water valve (15), a second four-way water valve (16), a power battery (17) and a battery water pump (18), the second port of the first four-way water valve (15) is connected with the water inlet of the first two-way water valve (14), the water outlet of the first two-way water valve (14) is connected with the fourth port of the second four-way water valve (16), the second port of the second four-way water valve (16) is connected with the water inlet of the battery water pump (18), the water outlet of the battery water pump (18) is connected with the negative electrode of the power battery (17), the positive electrode of the power battery (17) is connected with the fourth port of the first four-way water valve (15), the water side of the cooler (3) is connected between the third port of the first four-way water valve (15) and the first port of the second four-way water valve (16), the branch of the power battery (17) is connected with the water side of the cooler (3) to perform refrigeration, the first two-way water valve (14) is closed to connect the water side of the liquid cooling condenser (2) with the second port of the first four-way water valve (15) and the fourth port of the second four-way water valve (16), so that the opening and heating temperature of passenger cabin heating and the power battery (17) heating are controlled.

2. The electric vehicle thermal management system of claim 1, wherein: The air conditioner circulation system (1) further comprises a refrigerant electromagnetic valve (8) and a one-way valve (9). The refrigerant electromagnetic valve (8) is connected between the electric compressor (4) and the inlet of the external condenser (5). The one-way valve (9) is connected between the liquid accumulator (6) and the outlet of the external condenser (5).

3. The electric vehicle thermal management system of claim 1, wherein, The water circulation system (10) further comprises a PTC (13), and the PTC (13) is connected between the liquid cooling condenser (2) and the air conditioner box air heater (11).

4. The electric vehicle thermal management system of claim 3, wherein, The water circulation system (10) further comprises a first three-way water valve (19), a first water inlet of the first three-way water valve (19) is communicated with the air conditioner box air heater (11), a second water inlet of the first three-way water valve (19) is communicated with the PTC (13), and a water outlet of the first three-way water valve (19) is communicated with a fourth port of the second four-way water valve (16).

5. The electric vehicle thermal management system of claim 1, wherein, The water circulation system (10) further comprises an ADAS system (20) and a second two-way water valve (21), the second two-way water valve (21) is communicated between the positive electrode of the power battery (17) and the fourth port of the first four-way water valve (15), and the ADAS system (20) and the second two-way water valve (21) are connected in parallel.

6. The electric vehicle thermal management system of claim 5, wherein, The water circulation system (10) further comprises a motor system (22) and a motor water pump (23), a third port of the second four-way water valve (16) is communicated with a water inlet of the motor water pump (23), a water outlet of the motor water pump (23) is communicated with a water inlet of the motor system (22), and a water outlet of the motor system (22) is communicated with a first port of the first four-way water valve (15).

7. The electric vehicle thermal management system of claim 6, wherein, The water circulation system (10) further comprises a low-temperature radiator (24) and a second three-way water valve (25), the low-temperature radiator (24) and the second three-way water valve (25) are communicated between a third port of the second four-way water valve (16) and the motor system (22), the third port of the second four-way water valve is communicated with a water inlet of the second three-way water valve (25), a first water outlet of the second three-way water valve (25) is communicated with one end of the low-temperature radiator (24), and the motor system (22) and a second water outlet of the second three-way water valve (25) are respectively communicated with the other end of the low-temperature radiator (24).

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