Air conditioning system and electric automobile

Abstract

The utility model discloses an air conditioning system and an electric automobile. The air conditioning system comprises a first compressor, a four-way valve, an indoor heat exchanger, a first electronic expansion valve, an outdoor heat exchanger, a balance tank and a first switch valve, and the first compressor, the four-way valve, the indoor heat exchanger, the first electronic expansion valve and the outdoor heat exchanger are connected in a circulating mode and form a main channel allowing refrigerants to circulate in a circulating mode. The balance tank communicates with the main channel through a first pipeline, the first pipeline is arranged between the indoor heat exchanger and the first electronic expansion valve, and the first switch valve is arranged on the first pipeline. The air conditioning system is provided with the balance tank, and when the air conditioning system is in different working conditions, the pressure in the balance tank and the pressure in the indoor heat exchanger are changed, so that a refrigerant can flow between the balance tank and the main channel, and the adjustment of the filling amount of the refrigerant in the main channel is realized; a small amount of refrigerant circulates in the main channel in the heating mode, and a large amount of refrigerant circulates in the main channel in the refrigerating mode.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to an air-conditioning system and an electric vehicle. Background Art

[0002] In a wide-temperature-range heat pump air-conditioning system or a heat pump type independent battery thermal management system, both include an outdoor heat exchanger and an indoor heat exchanger. The heat exchange areas of the indoor heat exchanger and the outdoor heat exchanger are different, and the temperature of the working environment of the system can be as low as -30°C or as high as 60°C.

[0003] Due to the large span of the environmental temperature (from -30°C to 60°C), and due to the large difference in the heat exchange areas between the outdoor heat exchanger and the indoor heat exchanger, etc., it results in a large demand for refrigeration capacity of the whole vehicle under high-temperature working conditions in summer, and a large amount of refrigerant charge is required in the system; and it results in a small demand for refrigeration capacity of the whole vehicle under ultra-low-temperature working conditions in winter, and a small amount of refrigerant charge is required in the system. In short, under various working conditions in a wide temperature range, the difference in the refrigerant circulation amount required for the operation of the same system is very large. The different required mass flow rates of the refrigerant during high-temperature operation and low-temperature operation lead to different refrigerant charge amounts required for the same system.

[0004] The existing air-conditioning system cannot meet the requirement of variable refrigerant charge amount. How to propose an air-conditioning system with variable refrigerant charge amount is a technical problem that needs to be solved urgently at present. Summary of the Utility Model

[0005] The first object of the utility model is to provide an air-conditioning system, in which the charge amount of the refrigerant is variable.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] An air conditioning system, comprising: a first compressor, a four-way valve, an indoor heat exchanger, a first electronic expansion valve and an outdoor heat exchanger. The outlet end of the first compressor is communicated with the first valve port of the four-way valve. The second valve port of the four-way valve is communicated with the first end of the indoor heat exchanger. The second end of the indoor heat exchanger, the first electronic expansion valve and the first end of the outdoor heat exchanger are communicated in sequence. The second end of the outdoor heat exchanger is communicated with the third valve port of the four-way valve. The fourth valve port of the four-way valve is communicated with the inlet end of the first compressor, and a main channel for the refrigerant to circulate is formed. A balance tank and a first switching valve. The balance tank is used for storing the refrigerant. The balance tank is communicated with the main channel through a first pipeline, and the first pipeline is arranged between the indoor heat exchanger and the first electronic expansion valve. The first switching valve is arranged on the first pipeline. Wherein, when the air conditioning system is switched from the heating mode to the cooling mode, part of the refrigerant in the main channel can flow back to the balance tank through the first pipeline for storage. When it is switched from the heating mode to the cooling mode, at least part of the refrigerant in the balance tank can flow into the main channel through the first pipeline.

[0008] Preferably, the air conditioning system further comprises: a second pipeline and a second electronic expansion valve. The second pipeline is connected in parallel on both sides of the first electronic expansion valve. The second electronic expansion valve is arranged on the second pipeline. A third pipeline and a third electronic expansion valve. The third pipeline is connected in parallel on both sides of the first electronic expansion valve and the outdoor heat exchanger. The third electronic expansion valve is arranged on the third pipeline. An intermediate cooler. The intermediate cooler is communicated with both the first pipeline and the second pipeline. In the heating mode, the refrigerant flowing out of the indoor heat exchanger is split and enters the second pipeline and the third pipeline. The refrigerant entering the second pipeline flows through the intermediate cooler and the second electronic expansion valve in sequence. The refrigerant entering the third pipeline flows through the third electronic expansion valve and the intermediate cooler in sequence. A second compressor. The inlet end of the second compressor is communicated with the second end of the outdoor heat exchanger. The outlet end of the second compressor is communicated with the third valve port. Wherein, the refrigerant flowing out of the outdoor heat exchanger flows back to the third valve port through the second compressor, and the refrigerant in the third pipeline flows back to the third valve port.

[0009] Preferably, the air conditioning system further comprises a first check valve arranged on the second pipeline; and / or, the air conditioning system further comprises a second check valve arranged on the third pipeline; and / or, the second compressor is a low-pressure stage compressor, and the first compressor is a high-pressure stage compressor.

[0010] Preferably, the second end of the outdoor heat exchanger is communicated with the third valve port through a first main pipe, a second switching valve is arranged on the first main pipe, and the second compressor is arranged in parallel with the second switching valve; the inlet end of the second compressor is communicated with the first main pipe through a fourth pipeline, and a third switching valve is arranged on the fourth pipeline; the outlet end of the second compressor is communicated with the first main pipe through a fifth pipeline, and a fourth switching valve is arranged on the fifth pipeline; or, the outlet end of the second compressor is communicated with the third pipeline through a fifth pipeline, and a fourth switching valve is arranged on the part of the third pipeline communicating between the first main pipe and the fifth pipeline.

[0011] Preferably, the air conditioning system further includes a dryer filter, the dryer filter is located on the main passage and is arranged between the first electronic expansion valve and the outdoor heat exchanger; and / or, the air conditioning system further includes at least one sight glass, the sight glass is located on the main passage and is arranged between the first electronic expansion valve and the outdoor heat exchanger, and the sight glass is used for observing the refrigerant in the main passage in the refrigeration mode and / or the refrigerant in the main passage in the heating mode; and / or, the air conditioning system further includes a gas-liquid separator, the gas-liquid separator is located on the main passage and is arranged between the fourth valve port and the inlet end of the first compressor.

[0012] The second object of the present invention is to provide an electric vehicle, and the refrigerant charge amount in the air conditioning system of the electric vehicle is variable.

[0013] To achieve this purpose, the present invention adopts the following technical solutions:

[0014] An electric vehicle includes a battery thermal management system and the above air conditioning system, and the refrigerant in the air conditioning system can exchange heat with the coolant flowing through the battery box in the battery thermal management system.

[0015] Preferably, the battery thermal management system includes: a plate heat exchanger, a first channel for coolant flow and a second channel for refrigerant flow are formed in the plate heat exchanger; a first branch pipe and a fourth electronic expansion valve, one end of the first branch pipe is communicated with the main passage and is located between the first electronic expansion valve and the outdoor heat exchanger, the other end of the first branch pipe is communicated with one end of the second channel, and the fourth electronic expansion valve is arranged on the first branch pipe; a second branch pipe, one end of the second branch pipe is communicated with the other end of the second channel, the other end of the second branch pipe is communicated with the main passage and is located between the fourth valve port and the inlet end of the first compressor; wherein, in the refrigeration mode, the refrigerant flowing out of the outdoor heat exchanger is shunted and enters the first branch pipe and the first electronic expansion valve respectively.

[0016] Preferably, the battery thermal management system includes: a plate heat exchanger, in which a first channel for the coolant to flow and a second channel for the refrigerant to flow are formed; a third branch pipe and a fourth electronic expansion valve. One end of the third branch pipe is communicated with the main channel and is located between the first electronic expansion valve and the indoor heat exchanger. The other end of the third branch pipe is communicated with one end of the second channel. The fourth electronic expansion valve is arranged on the third branch pipe; a second branch pipe, one end of the second branch pipe is communicated with the other end of the second channel, and the other end of the second branch pipe is communicated with the main channel and is located between the fourth valve port and the inlet end of the first compressor. Wherein, in the heating mode, the refrigerant flowing out of the indoor heat exchanger is split and enters the third branch pipe and the first electronic expansion valve respectively.

[0017] Preferably, the battery thermal management system further includes a water tank, a water pump and the battery box. The battery water system of the battery box is connected end to end with the first channel to form a water circulation channel. The water pump is used to provide power for the coolant to flow in the water circulation channel. The water tank is communicated with the water circulation channel.

[0018] Preferably, the battery thermal management system further includes a first temperature detection mechanism arranged at the inlet of the first channel; and / or, the battery thermal management system further includes a second temperature detection mechanism arranged at the outlet of the first channel; and / or, the battery thermal management system further includes at least one valve core arranged on the water circulation channel.

[0019] The beneficial effects of the present utility model:

[0020] The air conditioning system provided by the present utility model includes a first compressor, a four-way valve, an indoor heat exchanger, a first electronic expansion valve, an outdoor heat exchanger, a balance tank and a first switching valve. The first compressor, the four-way valve, the indoor heat exchanger, the first electronic expansion valve and the outdoor heat exchanger are connected in a cycle to form a main channel for the refrigerant to circulate. The balance tank is used to store the refrigerant. The balance tank is communicated with the main channel through a first pipeline, and the first pipeline is arranged between the indoor heat exchanger and the first electronic expansion valve. The first switching valve is arranged on the first pipeline. The air conditioning system is provided with a balance tank. Since the pressure in the balance tank and the pressure in the indoor heat exchanger change when the air conditioning system is in different working conditions, the refrigerant can flow between the balance tank and the main channel, so as to realize the adjustment of the refrigerant filling amount in the main channel, so that less refrigerant flows in the main channel in the heating mode and more refrigerant flows in the main channel in the cooling mode.

[0021] The electric vehicle provided by the present utility model includes a battery thermal management system and the above-mentioned air conditioning system, and the refrigerant in the air conditioning system can exchange heat with the coolant flowing through the battery box in the battery thermal management system. The air conditioning system of this electric vehicle not only has strong adaptability to environmental temperature changes, but also can meet the refrigeration, heating requirements of the whole vehicle and the cooling requirements of the battery box. Description of the Drawings

[0022] Figure 1 is a schematic diagram of the air conditioning system and the battery thermal management system provided by the present utility model

[0023] Figure 2 is a schematic diagram of the electric vehicle provided by the present utility model when the air conditioning system is in the refrigeration mode;

[0024] Figure 3 is a schematic diagram of the electric vehicle provided by the present utility model when the air conditioning system is in the single-stage heating mode;

[0025] Figure 4 is a schematic diagram of the electric vehicle provided by the present utility model when the air conditioning system is in the double-stage heating mode.

[0026] In the figure:

[0027] 1. First compressor; 2. Four-way valve; 3. Indoor heat exchanger; 31. Evaporation fan; 4. First electronic expansion valve; 5. Outdoor heat exchanger; 51. Condensing fan; 6. Balance tank; 7. First pipeline; 8. First switching valve; 9. Second pipeline; 10. Second electronic expansion valve; 11. Intermediate cooler; 12. Third pipeline; 13. Third electronic expansion valve; 14. Second compressor; 15. First check valve; 16. Second check valve; 17. Second switching valve; 18. Fourth pipeline; 19. Third switching valve; 20. Fifth pipeline; 21. Fourth switching valve; 22. Drier filter; 23. First sight glass; 24. Second sight glass; 25. Gas-liquid separator;

[0028] 101. Plate heat exchanger; 102. First branch pipe; 103. Fourth electronic expansion valve; 104. Second branch pipe; 105. Third branch pipe; 106. Third check valve; 107. Fourth check valve; 108. Water tank; 109. Water pump; 110. Battery box; 111. First temperature detection mechanism; 112. Second temperature detection mechanism; 113. First valve core; 114. Second valve core. Detailed Embodiments

[0029] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0030] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0031] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0032] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0033] The present utility model discloses an air conditioning system, such as Figures 1 to 4As shown in the figure, the air conditioning system includes a first compressor 1, a four-way valve 2, an indoor heat exchanger 3, a first electronic expansion valve 4, an outdoor heat exchanger 5, a balance tank 6, and a first switching valve 8. Specifically, the outlet end of the first compressor 1 is communicated with the first valve port of the four-way valve 2, the second valve port of the four-way valve 2 is communicated with the first end of the indoor heat exchanger 3, the second end of the indoor heat exchanger 3, the first electronic expansion valve 4, and the first end of the outdoor heat exchanger 5 are communicated in sequence, the second end of the outdoor heat exchanger 5 is communicated with the third valve port of the four-way valve 2, and the fourth valve port of the four-way valve 2 is communicated with the inlet end of the first compressor 1. The first compressor 1, the four-way valve 2, the indoor heat exchanger 3, the first electronic expansion valve 4, and the outdoor heat exchanger 5 are connected in a cycle to form a main channel for the refrigerant to circulate. The balance tank 6 is used to store the refrigerant. The balance tank 6 is communicated with the main channel through a first pipeline 7, and the first pipeline 7 is arranged between the indoor heat exchanger 3 and the first electronic expansion valve 4. The first switching valve 8 is arranged on the first pipeline 7.

[0034] The air conditioning system has a refrigeration mode and a heating mode. Due to the large temperature span of the environment where the air conditioning system is located, there are differences in the demand for the refrigerant in the main channel of the air conditioning system. During the process of the air conditioning system switching from the refrigeration mode to the heating mode, part of the refrigerant in the main channel can flow back to the balance tank 6 through the first pipeline 7 for storage; during the process of switching from the heating mode to the refrigeration mode, at least part of the refrigerant in the balance tank 6 can flow into the main channel through the first pipeline 7. It should be noted that the initial state of the balance tank 6 can be an empty state or a loaded state with a certain amount of refrigerant stored, specifically depending on the environmental temperature when the air conditioning system is first used. For convenient use, the difference in the refrigerant in the main channel under the refrigeration mode and the heating mode can be calculated first, and then a coolant not less than this difference is pre-stored in the balance tank 6, and the remaining volume in the balance tank 6 in the loaded state is still larger than this difference.

[0035] Compared with the existing air conditioning system, the air conditioning system provided by the present utility model is provided with a balance tank 6. The on-off of the first channel can be controlled by the first switching valve 8, so that the space in the balance tank 6 can be communicated with or blocked from the main channel, thereby enabling the adjustment of the refrigerant charge in the main channel. When the air conditioning system operates under high temperature conditions in summer, at this time the air conditioner needs to operate in the cooling mode. The refrigerant pressure in the balance tank 6 is higher than the pressure in the indoor heat exchanger 3. When the first switching valve 8 is opened, the refrigerant in the balance tank 6 can flow through the first pipeline 7 to the main channel, so that more refrigerant flows in the main channel in the cooling mode. When the air conditioning system operates under ultra-low temperature conditions in winter, at this time the air conditioner needs to operate in the heating mode. The refrigerant pressure in the balance tank 6 is lower than the pressure in the indoor heat exchanger 3. When the first switching valve 8 is opened, the refrigerant in the main channel can flow back to the balance tank 6 through the first pipeline 7, so that less refrigerant flows in the main channel in the heating mode. When the refrigerant amount in the main channel is within a suitable range, the first switching valve 8 remains in the closed state.

[0036] In some embodiments, a first pressure detection mechanism (not shown in the figure) is provided in the indoor heat exchanger 3, and a second pressure detection mechanism (not shown in the figure) is provided in the balance tank 6. The pressure in the indoor heat exchanger 3 can be obtained by using the first pressure detection mechanism, and the pressure in the balance tank 6 can be obtained by using the second pressure detection mechanism. By comparing the pressure value obtained by the first pressure detection mechanism and the pressure value obtained by the second pressure detection mechanism, the opening and closing state of the first switching valve 8 can be controlled to be switched. Optionally, both the first pressure detection mechanism and the second pressure detection mechanism are pressure sensors.

[0037] Optionally, the first switching valve 8 is an electric ball valve. Of course, in addition to the electric ball valve, the first switching valve 8 can also be other electromagnetic control valves that can perform the on-off of the first pipeline 7.

[0038] Optionally, the first compressor 1 is a high-pressure stage compressor. The indoor heat exchanger 3 includes a first heat exchanger main body and an evaporation fan 31. The outdoor heat exchanger 5 includes a second heat exchanger main body and a condensing fan 51. It should be noted that the structures of the first compressor 1, the indoor heat exchanger 3, and the outdoor heat exchanger 5 are all prior arts and will not be described in detail here.

[0039] The heating mode of the air conditioning system includes a single-stage heating mode and a two-stage heating mode. The single-stage heating mode can be achieved by adopting the above structure.

[0040] In order to enable the air conditioning system to operate in the two-stage heating mode, continue to refer to Figure 1As shown in the figure, the air-conditioning system further includes a second pipeline 9, a second electronic expansion valve 10, an intermediate cooler 11, a third pipeline 12, a third electronic expansion valve 13, and a second compressor 14. To describe the positions of the components, it is defined that: the pipeline connecting the second end of the outdoor heat exchanger 5 and the third valve port is the first main pipeline; the pipeline connecting the first end of the outdoor heat exchanger 5 and the first electronic expansion valve 4 is the second main pipeline; the pipeline connecting the first electronic expansion valve 4 and the indoor heat exchanger 3 is the third main pipeline; the pipeline connecting the fourth valve port of the four-way valve 2 and the inlet end of the first compressor 1 is the fourth main pipeline.

[0041] Specifically, the second pipeline 9 is connected in parallel on both sides of the first electronic expansion valve 4. One end of the second pipeline 9 is connected to the second main pipeline, and the other end of the second pipeline 9 is connected to the third main pipeline. Both the second electronic expansion valve 10 and the intermediate cooler 11 are arranged on the second pipeline 9, and the intermediate cooler 11 is arranged close to the third main pipeline, and the second electronic expansion valve 10 is arranged close to the second main pipeline. Optionally, the air-conditioning system further includes a first check valve 15, and the first check valve 15 is arranged on the second pipeline 9. The first check valve 15 can ensure that the refrigerant only flows from the intermediate cooler 11 to the second electronic expansion valve 10. It should be noted that the second electronic expansion valve 10 not only has the function of throttling, but also has the function of controlling the on-off of the second pipeline 9.

[0042] The third pipeline 12 is connected in parallel on both sides of the first electronic expansion valve 4 and the outdoor heat exchanger 5. Specifically, one end of the third pipeline 12 is connected to the third main pipeline, and the other end of the third pipeline 12 is directly or indirectly connected to the first main pipeline. Both the third electronic expansion valve 13 and the intermediate cooler 11 are arranged on the third pipeline 12, and the second electronic expansion valve 10 is arranged close to the third main pipeline, and the intermediate cooler 11 is arranged close to the first main pipeline. Optionally, the air-conditioning system further includes a second check valve 16, and the second check valve 16 is arranged on the third pipeline 12. The second check valve 16 can ensure that the refrigerant only flows from the third electronic expansion valve 13 to the intermediate cooler 11. It should be noted that the third electronic expansion valve 13 not only has the function of throttling, but also has the function of controlling the on-off of the third pipeline 12.

[0043] Since the intermediate cooler 11 is simultaneously connected to both the third pipeline 12 and the second pipeline 9, the refrigerant in the second pipeline 9 and the refrigerant in the third pipeline 12 can exchange heat in the intermediate cooler 11.

[0044] The inlet end of the second compressor 14 is connected to the second end of the outdoor heat exchanger 5, and the outlet end of the second compressor 14 is connected to the third valve port. Optionally, the second compressor 14 is a low-pressure stage compressor.

[0045] To realize the connection and switching between the second compressor 14 and the main channel, a second switching valve 17 is provided on the first main pipe. The second compressor 14 and the second switching valve 17 are arranged in parallel. The inlet end of the second compressor 14 is communicated with the first main pipe through a fourth pipeline 18, and a third switching valve 19 is provided on the fourth pipeline 18. The outlet end of the second compressor 14 is communicated with the first main pipe through a fifth pipeline 20, and a fourth switching valve 21 is provided on the fifth pipeline 20. Of course, it can also be as Figure 1 shown that the outlet end of the second compressor 14 is communicated with the third pipeline 12 through the fifth pipeline 20, and the fourth switching valve 21 is arranged on the part of the third pipeline 12 that is communicated between the first main pipe and the fifth pipeline 20.

[0046] By switching the on-off states of the second switching valve 17, the third switching valve 19, and the fourth switching valve 21, the flow direction of the refrigerant can be controlled. Specifically, when the second switching valve 17 is open and the third switching valve 19 and the fourth switching valve 21 are closed, the refrigerant flowing out of the outdoor heat exchanger 5 does not pass through the second compressor 14 but directly flows to the four-way valve 2; when the second switching valve 17 is closed and the third switching valve 19 and the fourth switching valve 21 are open, the refrigerant flowing out of the outdoor heat exchanger 5 first passes through the second compressor 14 for compression and then flows to the four-way valve 2.

[0047] Optionally, the second switching valve 17, the third switching valve 19, and the fourth switching valve 21 are all electric ball valves. Of course, in addition to electric ball valves, the second switching valve 17, the third switching valve 19, and the fourth switching valve 21 can also be other electromagnetic control valves that can perform the on-off of the first pipeline 7.

[0048] Continue to refer to Figure 1 shown. In some embodiments, the air-conditioning system further includes a drying filter 22. The drying filter 22 is located on the main channel and is arranged between the first electronic expansion valve 4 and the outdoor heat exchanger 5. Specifically, the drying filter 22 is arranged on the second main pipe and is close to the outdoor heat exchanger 5. The drying filter 22 can dry and purify the refrigerant.

[0049] The air-conditioning system further includes at least one sight glass. The sight glass is located on the main channel and is arranged between the first electronic expansion valve 4 and the outdoor heat exchanger 5. The sight glass is used to observe the refrigerant in the main channel in the refrigeration mode and / or the refrigerant in the main channel in the heating mode.

[0050] Optionally, continue to refer to Figure 1 shown. The air-conditioning system includes a first sight glass 23 and a second sight glass 24. Both the first sight glass 23 and the second sight glass 24 are located on the second main pipe and are on both sides of the second pipeline 9. The first sight glass 23 is close to the drying filter 22, and the second sight glass 24 is close to the first electronic expansion valve 4.

[0051] Continue to refer toFigure 1 As shown, the air conditioning system further includes a gas-liquid separator 25, which is located on the main channel and is provided between the fourth valve port and the inlet end of the first compressor 1. Specifically, the gas-liquid separator 25 is provided on the fourth main pipe. The gas-liquid separator 25 can achieve gas-liquid separation, thereby protecting the first compressor 1 from damage.

[0052] The air conditioning system has a refrigeration mode, a single-stage heating mode, and a two-stage heating mode, so it has strong adaptability to the ambient temperature and has the advantage of operating well in a wide temperature range.

[0053] In the refrigeration mode: The first compressor 1 operates, and the operating frequency of the first compressor 1 changes according to the temperature change of the environment where the air conditioning system is located (such as inside an electric vehicle); the second compressor 14 is closed; the four-way valve 2 is in the refrigeration state; the condenser fan 51 and the evaporator fan 31 operate; the opening degree of the first electronic expansion valve 4 is controlled by superheat; the second switching valve 17 is opened; the first switching valve 8, the third switching valve 19, and the fourth switching valve 21 are closed. The second pipeline 9 and the second pipeline 9 do not participate in the refrigerant cycle.

[0054] As Figure 2 shown, the high-temperature and high-pressure refrigerant discharged from the outlet end of the first compressor 1 flows through the first valve port and the third valve port of the four-way valve 2 to the first main pipe, and then flows through the second switching valve 17 to the outdoor heat exchanger 5; the high-temperature and high-pressure refrigerant becomes a medium-temperature and high-pressure refrigerant after heat dissipation by the condenser fan 51 in the outdoor heat exchanger 5 and then flows out, and then successively passes through the dryer filter 22, the first sight glass 23, and the second sight glass 24 to the first electronic expansion valve 4. The medium-temperature and high-pressure refrigerant becomes a low-temperature and low-pressure two-phase refrigerant after throttling and pressure reduction by the first electronic expansion valve 4 and then flows to the indoor heat exchanger 3; the low-temperature and low-pressure two-phase refrigerant evaporates in the indoor heat exchanger 3 to absorb heat from the air, and in this process, it provides cooling to the interior (such as the passenger area of an electric vehicle). The low-temperature and low-pressure two-phase refrigerant becomes a medium-temperature and low-pressure superheated refrigerant vapor after heat absorption; finally, the medium-temperature and low-pressure superheated refrigerant vapor flows through the second valve port and the fourth valve port of the four-way valve 2 to the gas-liquid separator 25, and returns to the first compressor 1 through the gas-liquid separator 25 to complete the entire refrigeration cycle.

[0055] In the single-stage heating mode: The first compressor 1 operates, and the second compressor 14 is closed; the four-way valve 2 is in the heating state; the condenser fan 51 and the evaporator fan 31 operate; the opening degree of the first electronic expansion valve 4 is controlled by superheat; the first switching valve 8 and the second switching valve 17 are opened; the third switching valve 19 and the fourth switching valve 21 are closed. The second pipeline 9 and the second pipeline 9 do not participate in the refrigerant cycle.

[0056] As Figure 3As shown, the high-temperature and high-pressure refrigerant discharged from the outlet end of the first compressor 1 flows through the first valve port and the second valve port of the four-way valve 2 to the indoor heat exchanger 3, and after dissipating heat through the evaporation fan 31 in the indoor heat exchanger 3, it becomes a medium-temperature and high-pressure refrigerant and flows out, providing heat to the interior (such as the passenger area of an electric vehicle) during this process; since the pressure in the balance tank 6 is lower than the pressure in the indoor heat exchanger 3, part of the refrigerant flowing out of the indoor heat exchanger 3 flows into the balance tank 6 through the opened first switching valve 8 for temporary storage, thereby reducing the circulation amount of the refrigerant in the main channel, and the remaining medium-temperature and high-pressure refrigerant flowing out of the indoor heat exchanger 3 continues to flow to the first electronic expansion valve 4. After throttling and depressurizing by the first electronic expansion valve 4, it becomes a low-temperature and low-pressure two-phase refrigerant, and then flows through the second sight glass 24, the first sight glass 23 and the dryer filter 22 in sequence and then flows to the outdoor heat exchanger 5; the low-temperature and low-pressure two-phase refrigerant in the outdoor heat exchanger 5, with the condensation fan 51 running, the refrigerant evaporates and absorbs the heat in the outdoor air and then becomes a medium-temperature and low-pressure superheated refrigerant vapor; the superheated refrigerant vapor discharged from the outdoor heat exchanger 5 flows through the second switching valve 17, the third valve port and the fourth valve port of the four-way valve 2 to the gas-liquid separator 25 in sequence, and enters the first compressor 1 through the gas-liquid separator 25 to complete the entire cycle.

[0057] In the dual-stage heating mode; the first compressor 1 and the second compressor 14 both work; the four-way valve 2 is in the heating state; the condensation fan 51 and the evaporation fan 31 work; the first electronic expansion valve 4 is closed; the second switching valve 17 is closed; the first switching valve 8, the third switching valve 19 and the fourth switching valve 21 are opened. The opening degree of the second electronic expansion valve is controlled by the superheat degree, the opening degree of the third electronic expansion valve 13 is controlled by the optimal pressure, and both the second pipeline 9 and the second pipeline 9 participate in the refrigerant cycle.

[0058] As Figure 4As shown in the figure, first, the high-temperature and high-pressure refrigerant discharged from the outlet end of the first compressor 1 flows through the first valve port and the second valve port of the four-way valve 2 to the indoor heat exchanger 3, and after dissipating heat through the evaporation fan 31 in the indoor heat exchanger 3, it becomes a medium-temperature and high-pressure refrigerant and flows out. During this process, heat is provided to the interior (such as the passenger area of an electric vehicle). And since the pressure in the balance tank 6 is lower than the pressure in the indoor heat exchanger 3, part of the refrigerant flowing out of the indoor heat exchanger 3 flows into the balance tank 6 through the opened first switching valve 8 for temporary storage, thereby reducing the circulation amount of the refrigerant in the main channel. Then, the remaining medium-temperature and high-pressure refrigerant flowing out of the indoor heat exchanger 3 is divided into two paths: the first path of refrigerant enters the second pipeline 9, and the second path of refrigerant enters the third pipeline 12. Among them, the refrigerant entering the second pipeline 9 directly flows into the intermediate cooler 11, and the refrigerant entering the third pipeline 12 becomes a low-temperature and low-pressure refrigerant after throttling by the third electronic expansion valve 13. The low-temperature and low-pressure refrigerant in the third pipeline 12 exchanges heat with the medium-temperature and high-pressure refrigerant in the second pipeline 9 in the intermediate cooler 11, so that the refrigerant in the second pipeline 9 becomes a low-temperature and high-pressure refrigerant, and the low-temperature and low-pressure refrigerant in the third pipeline 12 becomes a medium-temperature and low-pressure refrigerant. Subsequently, the low-temperature and high-pressure refrigerant in the second pipeline 9 flows to the second electronic expansion valve 10, and after throttling by the second electronic expansion valve 10, it becomes a low-temperature and low-pressure two-phase refrigerant, and then successively passes through the second sight glass 24, the first sight glass 23, and the dryer filter 22 and flows to the outdoor heat exchanger 5. At the outdoor heat exchanger 5, the condensing fan 51 operates, and the refrigerant evaporates and absorbs the heat in the outdoor air and becomes a medium-temperature and low-pressure superheated refrigerant vapor; the superheated refrigerant vapor enters the second compressor 14 through the third switching valve 19, and after being compressed by the second compressor 14, it is mixed with the medium-temperature and low-pressure refrigerant flowing out of the intermediate cooler 11 and the second one-way valve 16 in the third pipeline 12. Finally, the mixed refrigerant successively passes through the fourth switching valve 21, the third valve port and the fourth valve port of the four-way valve 2 and flows to the gas-liquid separator 25, and enters the first compressor 1 through the gas-liquid separator 25 to complete the two-stage compression cycle.

[0059] Continue to refer to Figures 1 to 4 As shown in the figure, the present invention also discloses an electric vehicle, which includes a battery thermal management system and the above air-conditioning system. The refrigerant in the air-conditioning system can exchange heat with the coolant flowing through the battery box 110 in the battery thermal management system. The air-conditioning system of this electric vehicle not only has strong adaptability to environmental temperature changes, but also can meet the refrigeration and heating requirements of the whole vehicle and the cooling requirement of the battery box 110. That is, the air-conditioning system of this electric vehicle meets the refrigeration and heating requirements of the whole vehicle and the cooling requirement of the battery box 110 in all climate environments.

[0060] In some embodiments, the battery thermal management system includes a plate heat exchanger 101, a first branch pipe 102, a fourth electronic expansion valve 103, and a second branch pipe 104. Specifically, a first channel for coolant flow and a second channel for refrigerant flow are formed in the plate heat exchanger 101. One end of the first branch pipe 102 is communicated with the main channel and is located between the first electronic expansion valve 4 and the outdoor heat exchanger 5. The other end of the first branch pipe 102 is communicated with one end of the second channel. The fourth electronic expansion valve 103 is arranged on the first branch pipe 102. Specifically, one end of the first branch pipe 102 is communicated with the second main pipe, and the communication point is located between the second liquid sight glass 24 and the first electronic expansion valve 4. Optionally, the battery thermal management system further includes a third check valve 106, and the third check valve 106 is arranged on the first branch pipe 102. One end of the second branch pipe 104 is communicated with the other end of the second channel. The other end of the second branch pipe 104 is communicated with the main channel and is located between the fourth valve port and the inlet end of the first compressor 1. Specifically, the other end of the second branch pipe 104 is communicated with the fourth main pipe and is located between the gas-liquid separator 25 and the fourth valve port. Among them, in the refrigeration mode, the refrigerant flowing out of the outdoor heat exchanger 5 is split and enters the first branch pipe 102 and the first electronic expansion valve 4 respectively after passing through the drying filter 22, the first liquid sight glass 23, and the second liquid sight glass 24.

[0061] In some parallel embodiments, the battery thermal management system includes a plate heat exchanger 101, a third branch pipe 105, a fourth electronic expansion valve 103, and a second branch pipe 104. Specifically, a first channel for coolant flow and a second channel for refrigerant flow are formed in the plate heat exchanger 101. One end of the third branch pipe 105 is communicated with the main channel and is located between the first electronic expansion valve 4 and the indoor heat exchanger 3. The other end of the third branch pipe 105 is communicated with one end of the second channel. The fourth electronic expansion valve 103 is arranged on the third branch pipe 105. Specifically, one end of the third branch pipe 105 is communicated with the third main pipe, and the communication point is located between the first electronic expansion valve 4 and the first switching valve 8. Optionally, the battery thermal management system further includes a fourth check valve 107, and the fourth check valve 107 is arranged on the third branch pipe 105. One end of the second branch pipe 104 is communicated with the other end of the second channel. The other end of the second branch pipe 104 is communicated with the main channel and is located between the fourth valve port and the inlet end of the first compressor 1. Specifically, the other end of the second branch pipe 104 is communicated with the fourth main pipe and is located between the gas-liquid separator 25 and the fourth valve port. Among them, in the heating mode, the refrigerant flowing out of the indoor heat exchanger 3 is split and enters the third branch pipe 105 and the first electronic expansion valve 4 respectively.

[0062] In some parallel embodiments, the battery thermal management system includes a plate heat exchanger 101, a first branch pipe 102, a second branch pipe 104, a third branch pipe 105, and a fourth electronic expansion valve 103. On the basis of the above two embodiments, the first branch pipe 102 and the third branch pipe 105 form a Y-shaped pipe structure, the fourth electronic expansion valve 103 is arranged on the main pipeline of the Y-shaped pipe structure, and the third one-way valve 106 and the fourth one-way valve 107 are respectively arranged on the two branch pipelines of the Y-shaped pipe structure. In this way, in both the heating mode and the cooling mode, the air-conditioning system can exchange heat with the battery thermal management system through the plate heat exchanger 101.

[0063] Continue to refer to Figure 1 As shown, the battery thermal management system further includes a water tank 108, a water pump 109, and a battery box 110. The battery water system of the battery box 110 is connected end to end with the first channel to form a water circulation channel. The water pump 109 is used to provide power for the coolant to flow in the water circulation channel, and the water tank 108 is connected to the water circulation channel.

[0064] In some embodiments, the battery thermal management system further includes a first temperature detection mechanism 111, and the first temperature detection mechanism 111 is arranged at the inlet of the first channel. Optionally, the first temperature detection mechanism 111 is a temperature sensor.

[0065] In some embodiments, the battery thermal management system further includes a second temperature detection mechanism 112, and the second temperature detection mechanism 112 is arranged at the outlet of the first channel. Optionally, the first temperature detection mechanism 111 is a temperature sensor.

[0066] In some embodiments, the battery thermal management system further includes at least one valve core, and the valve core is arranged on the water circulation channel. The valve core is used to discharge the gas in the water circulation channel, thereby improving the heat exchange effect between the air-conditioning system and the battery thermal management system.

[0067] Optionally, there are two valve cores, namely a first valve core 113 and a second valve core 114. The first valve core 113 is arranged between the first temperature detection mechanism 111 and the water pump 109, and the second valve core 114 is arranged between the second temperature detection mechanism 112 and the water tank 108 of the battery.

[0068] When the whole electric vehicle (including the passenger area and the battery box 110) has a refrigeration requirement, such as Figure 2 As shown:

[0069] The air conditioning system operates in the refrigeration mode. The high-temperature and high-pressure refrigerant discharged from the outlet end of the first compressor 1 flows through the first valve port and the third valve port of the four-way valve 2 to the first main pipe, and then flows through the second switching valve 17 to the outdoor heat exchanger 5; the high-temperature and high-pressure refrigerant flows out after being condensed by the heat dissipation of the condenser fan 51 in the outdoor heat exchanger 5 and then becomes a medium-temperature and high-pressure refrigerant, and then successively passes through the drying filter 22, the first sight glass 23, and the second sight glass 24 and is divided into two paths: the main path and the battery path. The first path (main path): the refrigerant flows to the first electronic expansion valve 4, and the medium-temperature and high-pressure refrigerant becomes a low-temperature and low-pressure two-phase refrigerant after throttling and depressurizing through the first electronic expansion valve 4 and then flows to the indoor heat exchanger 3; the low-temperature and low-pressure two-phase refrigerant evaporates and absorbs heat from the air in the indoor heat exchanger 3, providing cooling capacity to the passenger area during this process, and the low-temperature and low-pressure two-phase refrigerant becomes a medium-temperature and low-pressure superheated refrigerant vapor after absorbing heat. The second path (battery path): the refrigerant flows to the first branch pipe 102 and successively passes through the third check valve 106 and the fourth electronic expansion valve 103, and becomes a low-temperature and low-pressure refrigerant after throttling and depressurizing through the fourth electronic expansion valve 103. The low-temperature and low-pressure refrigerant enters the second channel of the plate heat exchanger 101 and exchanges heat with the coolant entering the first channel in the battery thermal management system, causing the temperature of the coolant to decrease, and the refrigerant in the second channel becomes a medium-temperature and low-pressure superheated refrigerant vapor after absorbing heat, and then mixes with the medium-temperature and low-pressure superheated refrigerant vapor in the first path. Finally, the mixed medium-temperature and low-pressure superheated refrigerant vapor flows through the second valve port and the fourth valve port of the four-way valve 2 to the gas-liquid separator 25, and returns to the first compressor 1 through the gas-liquid separator 25 to complete the entire refrigeration cycle.

[0070] In the battery thermal management system, driven by the water pump 109, the coolant enters the first channel of the plate heat exchanger 101, exchanges heat with the refrigerant in the second channel, and the temperature decreases. The cooled coolant enters the battery box 110 to cool the battery.

[0071] When there is a heating demand in the passenger area of the electric vehicle and a cooling demand in the battery box 110:

[0072] Such as Figure 3As shown, when the air-conditioning system operates in the single-stage heating mode, first, the high-temperature and high-pressure refrigerant discharged from the outlet end of the first compressor 1 flows through the first and second valve ports of the four-way valve 2 to the indoor heat exchanger 3. After dissipating heat through the evaporation fan 31 in the indoor heat exchanger 3, it becomes a medium-temperature and high-pressure refrigerant and flows out. During this process, heat is provided to the (passenger area). Since the pressure in the balance tank 6 is lower than the pressure in the indoor heat exchanger 3, a part of the refrigerant flowing out of the indoor heat exchanger 3 flows into the balance tank 6 through the opened first switching valve 8 for temporary storage, thereby reducing the circulation amount of the refrigerant in the main channel. Then, the remaining medium-temperature and high-pressure refrigerant flowing out of the indoor heat exchanger 3 is divided into two paths: the main path and the battery path. The first path, the main path: The refrigerant continues to flow to the first electronic expansion valve 4. After throttling and depressurizing through the first electronic expansion valve 4, it becomes a low-temperature and low-pressure two-phase refrigerant, and then flows through the second sight glass 24, the first sight glass 23, and the dryer filter 22 in sequence and then flows to the outdoor heat exchanger 5. In the outdoor heat exchanger 5, with the condensation fan 51 running, the refrigerant evaporates and absorbs the heat in the outdoor air and then becomes a medium-temperature and low-pressure superheated refrigerant vapor. The medium-temperature and low-pressure superheated refrigerant vapor discharged from the outdoor heat exchanger 5 flows through the second switching valve 17, the third valve port, and the fourth valve port of the four-way valve 2 in sequence and flows into the fourth main path. The second path, the battery path: The refrigerant flows to the third branch pipe 105 and passes through the fourth check valve 107 and the fourth electronic expansion valve 103 in sequence. After throttling and depressurizing through the fourth electronic expansion valve 103, it becomes a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant enters the second channel of the plate heat exchanger 101 and exchanges heat with the coolant entering the first channel in the battery thermal management system, causing the temperature of the coolant to decrease. The refrigerant in the second channel becomes a medium-temperature and low-pressure superheated refrigerant vapor after absorbing heat and is discharged from the plate heat exchanger 101 and flows to the second branch pipe 104 and directly flows into the fourth main pipe, where it mixes with the medium-temperature and low-pressure superheated refrigerant vapor in the first path. Finally, the mixed superheated refrigerant vapor enters the first compressor 1 through the gas-liquid separator 25 to complete the entire cycle.

[0073] In the battery thermal management system, driven by the water pump 109, the coolant enters the first channel of the plate heat exchanger 101, exchanges heat with the refrigerant in the second channel, and then the temperature decreases. The cooled coolant enters the battery box 110 to cool the battery.

[0074] When the electric vehicle operates under ultra-low temperature conditions in winter, the air-conditioning system operates in the two-stage heating mode, and a two-stage compression system with two compressors is used to obtain higher heating capacity and improve the comfort of the passenger area. Regarding the operation of the air-conditioning system in the two-stage heating mode, as Figure 4As shown and already introduced in detail above, it will not be elaborated here. When the electric vehicle operates under extremely high temperature conditions in summer, the air conditioning system operates in the cooling mode, and the air conditioning system provides cooling capacity for the passenger compartment and the battery box 110. When the electric vehicle operates at an ambient temperature between the aforementioned two ambient temperatures and the passenger compartment has a heating demand while the battery box 110 has a cooling demand, the air conditioning system operates in the single-stage heating mode to provide heat for the passenger compartment and cooling capacity for the battery box 110, thereby better meeting the requirements of the entire vehicle.

[0075] The electric vehicle further includes a control mechanism. The control mechanism can be a centralized or distributed controller. For example, the controller can be a single microcontroller or composed of multiple distributed microcontrollers. A control program can run in the microcontroller to control the aforementioned electric components to respectively implement their functions. Of course, the air conditioning system and the battery thermal management system can also be controlled by two control mechanisms respectively.

[0076] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. An air conditioning system, characterized in that: include: A first compressor (1), a four-way valve (2), an indoor heat exchanger (3), a first electronic expansion valve (4) and an outdoor heat exchanger (5), wherein the outlet end of the first compressor (1) is communicated with the first valve port of the four-way valve (2), the second valve port of the four-way valve (2) is communicated with the first end of the indoor heat exchanger (3), the second end of the indoor heat exchanger (3), the first electronic expansion valve (4) and the first end of the outdoor heat exchanger (5) are communicated in sequence, the second end of the outdoor heat exchanger (5) is communicated with the third valve port of the four-way valve (2), the fourth valve port of the four-way valve (2) is communicated with the inlet end of the first compressor (1), and a main channel for the circulation of refrigerant is formed; a balancing tank (6) and a first switch valve (8), wherein the balancing tank (6) is used to store refrigerant, the balancing tank (6) is connected to the main channel via a first pipeline (7), and the first pipeline (7) is arranged between the indoor heat exchanger (3) and the first electronic expansion valve (4), and the first switch valve (8) is arranged on the first pipeline (7); When the air-conditioning system switches from a cooling mode to a heating mode, part of the refrigerant in the main channel can flow back to the balancing tank (6) through the first pipeline (7) for storage; when the air-conditioning system switches from a heating mode to a cooling mode, at least part of the refrigerant in the balancing tank (6) can flow into the main channel through the first pipeline (7).

2. The air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises: a second pipeline (9) and a second electronic expansion valve (10), wherein the second pipeline (9) is connected in parallel to both sides of the first electronic expansion valve (4), and the second electronic expansion valve (10) is arranged on the second pipeline (9); a third pipeline (12) and a third electronic expansion valve (13), wherein the third pipeline (12) is connected in parallel to both sides of the first electronic expansion valve (4) and the outdoor heat exchanger (5), and the third electronic expansion valve (13) is arranged on the third pipeline (12); an intercooler (11), the intercooler (11) being in communication with both the first pipeline (7) and the second pipeline (9); in a heating mode, the refrigerant flowing out of the indoor heat exchanger (3) is split and enters the second pipeline (9) and the third pipeline (12); the refrigerant entering the second pipeline (9) flows through the intercooler (11) and the second electronic expansion valve (10) in sequence, and the refrigerant entering the third pipeline (12) flows through the third electronic expansion valve (13) and the intercooler (11) in sequence; a second compressor (14), wherein an inlet end of the second compressor (14) is in communication with a second end of the outdoor heat exchanger (5), and an outlet end of the second compressor (14) is in communication with the third valve port; The refrigerant flowing out of the outdoor heat exchanger (5) flows back to the third valve port through the second compressor (14), and the refrigerant in the third pipeline (12) flows back to the third valve port.

3. The air conditioning system according to claim 2, characterized in that: The air conditioning system further comprises a first one-way valve (15), wherein the first one-way valve (15) is arranged on the second pipeline (9); And / or, the air conditioning system further comprises a second one-way valve (16), wherein the second one-way valve (16) is arranged on the third pipeline (12); And / or, the second compressor (14) is a low-pressure compressor, and the first compressor (1) is a high-pressure compressor.

4. The air conditioning system according to claim 2, characterized in that: The second end of the outdoor heat exchanger (5) is connected to the third valve port via a first main pipe, a second switch valve (17) is provided on the first main pipe, and the second compressor (14) and the second switch valve (17) are arranged in parallel; The inlet end of the second compressor (14) is connected to the first main pipe via a fourth pipe (18), and a third switch valve (19) is provided on the fourth pipe (18); The outlet end of the second compressor (14) is connected to the first main pipe via a fifth pipe (20), and a fourth switch valve (21) is provided on the fifth pipe (20); or the outlet end of the second compressor (14) is connected to the third pipe (12) via the fifth pipe (20), and a fourth switch valve (21) is provided on the portion of the third pipe (12) connected between the first main pipe and the fifth pipe (20).

5. The air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises a drying filter (22), wherein the drying filter (22) is located on the main channel and is arranged between the first electronic expansion valve (4) and the outdoor heat exchanger (5); And / or, the air conditioning system further comprises at least one sight glass, the sight glass being located on the main channel and disposed between the first electronic expansion valve (4) and the outdoor heat exchanger (5), the sight glass being used to observe the refrigerant in the main channel in a cooling mode and / or the refrigerant in the main channel in a heating mode; And / or, the air conditioning system further comprises a gas-liquid separator (25), wherein the gas-liquid separator (25) is located on the main channel and is arranged between the fourth valve port and the inlet end of the first compressor (1).

6. An electric vehicle, characterized in that: It comprises a battery thermal management system and an air conditioning system according to any one of claims 1 to 5, wherein the refrigerant in the air conditioning system can perform heat exchange with the coolant flowing through the battery box (110) in the battery thermal management system.

7. The electric vehicle according to claim 6, characterized in that: The battery thermal management system comprises: A plate heat exchanger (101), wherein a first channel for cooling liquid to flow and a second channel for refrigerant to flow are formed in the plate heat exchanger (101); a first branch pipe (102) and a fourth electronic expansion valve (103), wherein one end of the first branch pipe (102) is in communication with the main channel and is located between the first electronic expansion valve (4) and the outdoor heat exchanger (5), the other end of the first branch pipe (102) is in communication with one end of the second channel, and the fourth electronic expansion valve (103) is arranged on the first branch pipe (102); a second branch pipe (104), one end of the second branch pipe (104) being connected to the other end of the second channel, the other end of the second branch pipe (104) being connected to the main channel and being located between the fourth valve port and the inlet end of the first compressor (1); Wherein, in cooling mode, the refrigerant flowing out of the outdoor heat exchanger (5) is divided and enters the first branch pipe (102) and the first electronic expansion valve (4) respectively.

8. The electric vehicle according to claim 6, characterized in that: The battery thermal management system comprises: A plate heat exchanger (101), wherein a first channel for cooling liquid to flow and a second channel for refrigerant to flow are formed in the plate heat exchanger (101); a third branch pipe (105) and a fourth electronic expansion valve (103), one end of the third branch pipe (105) being in communication with the main channel and being located between the first electronic expansion valve (4) and the indoor heat exchanger (3), the other end of the third branch pipe (105) being in communication with one end of the second channel, and the fourth electronic expansion valve (103) being arranged on the third branch pipe (105); a second branch pipe (104), one end of the second branch pipe (104) being connected to the other end of the second channel, the other end of the second branch pipe (104) being connected to the main channel and being located between the fourth valve port and the inlet end of the first compressor (1); Wherein, in the heating mode, the refrigerant flowing out of the indoor heat exchanger (3) is divided and enters the third branch pipe (105) and the first electronic expansion valve (4) respectively.

9. The electric vehicle according to claim 7 or 8, characterized in that: The battery thermal management system further comprises a water tank (108), a water pump (109) and the battery box (110); the battery water system of the battery box (110) is connected end to end with the first channel to form a water circulation channel; the water pump (109) is used to provide power for the coolant to flow in the water circulation channel; and the water tank (108) is connected with the water circulation channel.

10. The electric vehicle according to claim 9, characterized in that: The battery thermal management system further comprises a first temperature detection mechanism (111), wherein the first temperature detection mechanism (111) is arranged at the entrance of the first channel; And / or, the battery thermal management system further comprises a second temperature detection mechanism (112), wherein the second temperature detection mechanism (112) is arranged at an outlet of the first channel; And / or, the battery thermal management system further includes at least one valve core, and the valve core is arranged on the water circulation channel.

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