Electric vehicle heat pump air conditioning system and electric vehicle

Abstract

The present invention relates to the field of air conditioning technology, and discloses an electric vehicle heat pump air conditioning system and an electric vehicle. The heat pump air conditioning system includes an air supply branch, an air supply expansion valve, and an intermediate heat exchanger. The compression unit includes an air supply compressor, the first end of the air supply branch is connected to the air supply port of the air supply compressor, and the second end of the air supply branch is connected to the pipeline between the in-vehicle heat exchange unit and the main expansion valve. The low-temperature side of the intermediate heat exchanger and the air supply expansion valve are respectively connected in series to the air supply branch, and the high-temperature side of the intermediate heat exchanger is connected in series to the pipeline between the in-vehicle heat exchange unit and the main expansion valve. The air supply branch also flows through at least one of the vehicle's motor, battery, and electronic control. The electric vehicle heat pump air conditioning system and electric vehicle provided by the present invention recover heat from at least one of the vehicle's motor, battery, and electronic control through the air supply branch, thereby obtaining additional heat absorption benefits, thereby effectively increasing the heating capacity and improving the heating efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a heat pump air conditioning system for an electric vehicle and an electric vehicle. Background Art

[0002] Compared to traditional internal combustion engine vehicles, electric vehicles cannot utilize waste heat from the engine for interior heating. Currently, electric heaters are commonly used in winter to supplement the air conditioning system. However, electric heaters are not only inefficient but also consume a large amount of onboard power, significantly reducing the vehicle's range.

[0003] Heat pump air conditioners, with their excellent cooling and heating performance, are a key solution for integrated heating and cooling in electric vehicles and have become a research hotspot in the electric vehicle industry. Existing heat pump systems for electric vehicle air conditioning utilize two heat exchangers, one inside the vehicle and one outside, switching between heating and cooling modes via a four-way valve. However, when outdoor temperatures are low, the compressor exhaust temperature often limits the heat pump air conditioner's heating capacity and efficiency, severely impacting heating effectiveness and failing to meet the requirements for electric vehicles in cold climates. Summary of the Invention

[0004] The embodiments of the present invention provide an electric vehicle heat pump air-conditioning system and an electric vehicle, which are used to solve or partially solve the problem of poor heating effect of the electric vehicle air-conditioning system in the prior art.

[0005] An embodiment of the present invention provides an electric vehicle heat pump air-conditioning system, comprising a compression unit, a four-way valve, an in-vehicle heat exchange unit, a main expansion valve and an out-vehicle heat exchange unit connected by pipelines to form a loop; further comprising an air supply branch, an air supply expansion valve and an intermediate heat exchanger; the compression unit comprises an air supply compressor, the first end of the air supply branch is connected to the air supply port of the air supply compressor, and the second end of the air supply branch is connected to the pipeline between the in-vehicle heat exchange unit and the main expansion valve; the low-temperature side of the intermediate heat exchanger and the air supply expansion valve are respectively arranged in series on the air supply branch, and the high-temperature side of the intermediate heat exchanger is arranged in series on the pipeline between the in-vehicle heat exchange unit and the main expansion valve; the air supply branch also flows through at least one of the vehicle's motor, battery and electronic control.

[0006] On the basis of the above solution, the first end of the air supply branch is further connected to the air inlet pipeline of the air supply compressor.

[0007] Based on the above solution, a first solenoid valve is provided between the first end of the air supply branch and the air supply port of the air supply compressor; a second solenoid valve is provided between the first end of the air supply branch and the air inlet pipeline of the air supply compressor.

[0008] On the basis of the above solution, a gas-liquid separator is provided on the air inlet pipeline of the air supply compressor.

[0009] Based on the above solution, the air-supply expansion valve is arranged close to the second end of the air-supply branch.

[0010] On the basis of the above solution, at least one of the motor, battery and electronic control of the vehicle is provided with a waste heat exchanger, and the low-temperature side of the waste heat exchanger is connected in series to the air supply branch.

[0011] On the basis of the above solution, the intermediate heat exchanger is provided between the air-supply expansion valve and the waste heat exchanger, or the waste heat exchanger is provided between the air-supply expansion valve and the intermediate heat exchanger.

[0012] On the basis of the above solution, the compression unit includes a plurality of the air-supplementing compressors arranged in series and / or in parallel, and at least one of the air-supplementing compressors is connected to the air-supplementing branch.

[0013] Based on the above solution, the compression unit further includes a non-air-supplementing compressor.

[0014] An embodiment of the present invention further provides an electric vehicle, comprising the electric vehicle heat pump air conditioning system.

[0015] An embodiment of the present invention provides an electric vehicle heat pump air-conditioning system and an electric vehicle. An air supply branch is provided. Under heating conditions, a higher suction superheat can be achieved by increasing the enthalpy of the air supply at the same exhaust temperature of the compressor. At the same time, the heat of the coolant in at least one of the vehicle's motor, battery, and electronic control is recovered through the air supply branch to obtain additional heat absorption benefits. This effectively increases the heating capacity and improves the heating efficiency, achieving a good heating effect and helping to meet the use requirements of the heat pump air-conditioning system under more extreme cold conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of a heat pump air conditioning system for an electric vehicle provided by an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the heating working condition of a heat pump air conditioning system for an electric vehicle provided by an embodiment of the present invention;

[0019] Figure 3This is a schematic diagram of the cooling working condition of a heat pump air-conditioning system for an electric vehicle provided by an embodiment of the present invention;

[0020] Figure 4 This is another schematic diagram of an electric vehicle heat pump air conditioning system provided by an embodiment of the present invention;

[0021] Figure 5 This is another heating working principle diagram of an electric vehicle heat pump air conditioning system provided by an embodiment of the present invention;

[0022] Figure 6 This is another schematic diagram of the cooling working condition of an electric vehicle heat pump air-conditioning system provided by an embodiment of the present invention.

[0023] Reference numerals:

[0024] 1. Air supply compressor; 2. Four-way valve; 2a. First port; 2b. Second port; 2c. Third port; 2d. Fourth port; 3. In-vehicle heat exchanger; 4. In-vehicle fan; 5. Main expansion valve; 6. Out-vehicle heat exchanger; 7. Out-vehicle fan; 8. Gas-liquid separator; 9. Air supply expansion valve; 10. Intermediate heat exchanger; 11. Waste heat exchanger; 12. First solenoid valve; 13. Second solenoid valve; 14. Air supply branch; 14a. First end of the air supply branch; 14b. Second end of the air supply branch. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] refer to Figure 1 and Figure 3 An embodiment of the present invention provides an electric vehicle heat pump air-conditioning system, which includes a compression unit, a four-way valve 2, an in-vehicle heat exchange unit, a main expansion valve 5, and an out-vehicle heat exchange unit connected by pipes to form a loop; the four-way reversing valve is used to realize the switching of the cooling and heating processes of the heat pump air-conditioning system; the four-way valve 2 can control the flow direction of the refrigerant in the loop, thereby controlling the formation of a heating loop or a cooling loop.

[0027] The electric vehicle heat pump air conditioning system also includes an air supply branch 14, an air supply expansion valve 9, and an intermediate heat exchanger 10. The compression unit includes an air supply compressor 1; that is, the compressor is a compressor with an air supply function, having an air supply port in addition to the air intake port of a conventional compressor. The first end 14a of the air supply branch is connected to the air supply port of the air supply compressor 1, and the second end 14b of the air supply branch is connected to the pipeline between the in-vehicle heat exchange unit and the main expansion valve 5. The low-temperature side of the intermediate heat exchanger 10 and the air supply expansion valve 9 are respectively connected in series to the air supply branch 14, and the high-temperature side of the intermediate heat exchanger 10 is connected in series to the pipeline between the in-vehicle heat exchange unit and the main expansion valve 5. The air supply branch 14 also flows through at least one of the vehicle's motor, battery, and electronic control.

[0028] The intermediate heat exchanger 10 has a low-temperature side and a high-temperature side; the low-temperature side, i.e., the side with a lower temperature, serves as a cold source in the heat exchanger; the high-temperature side, i.e., the side with a higher temperature, serves as a heat source in the heat exchanger. The air supply branch 14 is provided between the compression unit and the in-vehicle heat exchange unit. Figure 2 In the heating condition, the pipeline between the in-vehicle heat exchange unit and the main expansion valve 5 is the outlet pipeline of the in-vehicle heat exchange unit; the air supply branch 14 is connected to the outlet pipeline of the in-vehicle heat exchange unit, that is, the refrigerant at the outlet end of the in-vehicle heat exchange unit is divided into two branches through the pipeline, one of which is connected to the air supply expansion valve 9 to form the refrigerant air supply branch 14; the other branch is connected to the main expansion valve 5 to form the main branch of the heating system, which flows through a process of the intermediate heat exchanger 10.

[0029] As a result, the temperature of the refrigerant entering the air supply branch 14 is further reduced after flowing through the air supply expansion valve 9; as a result, the two branch refrigerants separated from the outlet of the vehicle's heat exchange unit exchange heat in the intermediate heat exchanger 10, so that the temperature of the refrigerant in the main branch is further reduced, which is beneficial to increase the heat absorption superheat and improve the heat absorption efficiency in the outdoor heat exchange unit, thereby improving the heating efficiency.

[0030] Furthermore, the refrigerant in the air supply branch 14 exchanges heat with the coolant in at least one of the vehicle's motor, battery, or electronic control as it flows through the vehicle, absorbing heat from the coolant before flowing to the compression unit. This not only cools the coolant in the vehicle's motor, battery, or electronic control, but also recovers heat from the coolant, allowing the heating circuit to absorb additional heat and improve heating efficiency.

[0031] The present embodiment provides an electric vehicle heat pump air-conditioning system, which is provided with an air supply branch 14. Under heating conditions, the air supply branch 14 can increase the enthalpy of the air supply to achieve a higher suction superheat at the same exhaust temperature of the compressor. At the same time, the air supply branch 14 is used to recover the heat of the coolant in at least one of the vehicle motor, battery, and electronic control, thereby obtaining additional heat absorption benefits; thereby effectively increasing the heating capacity and improving the heating efficiency, achieving a good heating effect, and being conducive to meeting the use requirements of the heat pump air-conditioning system under more extreme cold conditions.

[0032] Further, refer to Figure 3 In the cooling condition, the pipeline between the in-vehicle heat exchange unit and the main expansion valve 5 is the inlet pipeline of the in-vehicle heat exchange unit; the air supply branch 14 is connected to the inlet pipeline of the in-vehicle heat exchange unit, that is, the refrigerant flowing into the inlet end of the in-vehicle heat exchange unit is divided into two branches through the pipeline, one of which is connected to the air supply expansion valve 9 to form the refrigerant air supply branch 14; the other branch is connected to the in-vehicle heat exchange unit to form the main branch of the refrigeration system, which flows through a process of the intermediate heat exchanger 10.

[0033] As a result, the refrigerant flowing from the main expansion valve 5 into the air supply branch 14 further reduces its temperature after passing through the air supply expansion valve 9. The refrigerant in the main branch is further cooled in the intermediate heat exchanger 10, further lowering its temperature, thereby improving cooling efficiency. The refrigerant in the air supply branch 14 also flows through at least one of the vehicle's motor, battery, and electronic control to absorb heat from the coolant before returning to the compression unit. This air supply branch 14 further improves cooling efficiency.

[0034] Further, refer to Figure 1 Four-way valve 2 has four ports: first port 2a, second port 2b, third port 2c, and fourth port 2d, in counterclockwise order. The compressor outlet is connected to first port 2a; second port 2b is connected to the off-board heat exchange unit; third port 2c is connected to the compressor's intake line, that is, to the compressor's intake port; and fourth port 2d is connected to the on-board heat exchange unit. The off-board and on-board heat exchange units are also connected by a pipeline and equipped with a main expansion valve.

[0035] refer to Figure 2 In heating mode, the first port 2a and the fourth port 2d of the four-way valve 2 are connected, and the second port 2b and the third port 2c are connected; the refrigerant flows in sequence along the compressor, the in-vehicle heat exchange unit, the main expansion valve, and the out-vehicle heat exchange unit to form a heating circuit. Figure 3 In the cooling condition, the first port 2a and the second port 2b of the four-way valve 2 are connected, and the third port 2c and the fourth port 2d are connected; the refrigerant flows in sequence along the compressor, the external heat exchange unit, the main expansion valve and the internal heat exchange unit to form a refrigeration circuit.

[0036] On the basis of the above embodiments, further referring to Figure 1 The first end 14a of the air supply branch is also connected to the air intake pipeline of the air supply compressor 1. The air intake pipeline is connected to the air intake of the air supply compressor 1.

[0037] On the basis of the above embodiment, a first solenoid valve 12 is further provided between the first end 14a of the air supply branch and the air supply port of the air supply compressor 1; a second solenoid valve 13 is provided between the first end 14a of the air supply branch and the air intake pipe of the air supply compressor 1.

[0038] On the basis of the above embodiment, further, a gas-liquid separator 8 is provided on the air inlet pipeline of the air supply compressor 1 .

[0039] Furthermore, the gas-liquid separator 8 is disposed between the first end 14a of the air supply branch and the air intake of the air supply compressor 1. Before entering the compressor, the air supply branch 14 is connected to the compressor air supply port and the inlet of the gas-liquid separator 8 via pipelines. Solenoid valves are provided in the connecting pipelines to switch the connection between the air supply branch 14 and the compressor air supply port and the compressor air intake, respectively, to cool or recover heat from the coolant in at least one of the vehicle's motor, battery, or electronic control.

[0040] In addition to the above embodiment, the air-supply expansion valve 9 is further positioned near the second end 14b of the air-supply branch. Specifically, the air-supply expansion valve 9 is positioned closer to the second end 14b of the air-supply branch than other components on the air-supply branch 14. Refrigerant in the pipeline between the in-vehicle heat exchange unit and the main expansion valve 5 initially flows through the air-supply expansion valve 9 at the second end 14b of the air-supply branch.

[0041] On the basis of the above embodiment, further, at least one of the motor, battery and electronic control of the vehicle is provided with a waste heat exchanger 11 , and the low temperature side of the waste heat exchanger 11 is connected in series to the air supply branch 14 .

[0042] On the basis of the above embodiment, further, the intermediate heat exchanger 10 is provided between the air-supplementing expansion valve 9 and the waste heat exchanger 11, or the waste heat exchanger 11 is provided between the air-supplementing expansion valve 9 and the intermediate heat exchanger 10. Figure 1 , the air-supply expansion valve 9, the intermediate heat exchanger 10 and the waste heat exchanger 11 are connected in sequence through pipelines, and the refrigerant flow path of the waste heat exchanger 11 is connected to the air-supply port of the air-supply compressor 1; or refer to Figure 4 The air-supply expansion valve 9, the waste heat exchanger 11 and the intermediate heat exchanger 10 are connected in sequence through pipelines, and the other end of the intermediate heat exchanger 10 is connected to the air-supply port of the air-supply compressor 1.

[0043] Furthermore, the intermediate heat exchanger 10 can be a plate heat exchanger or a shell and tube heat exchanger; the waste heat exchanger 11 can be a plate heat exchanger or a shell and tube heat exchanger. The intermediate heat exchanger 10 and the waste heat exchanger can also use multiple heat exchangers at the same time, and the specific form is not limited.

[0044] On the basis of the above embodiment, the compression unit further includes a plurality of air-supplementing compressors 1 arranged in series and / or in parallel, and at least one air-supplementing compressor 1 is connected to an air-supplementing branch 14 .

[0045] On the basis of the above embodiment, further, the compression unit also includes a non-air-supplementing compressor.

[0046] Depending on the vehicle load, a single air supply compressor 1 can be used to install a heat pump air conditioning system with waste heat recovery, i.e., an air supply branch 14. Alternatively, two small-capacity air supply compressors 1 can be used to install two identical heat pump air conditioning systems with waste heat recovery. Alternatively, one air supply compressor 1 and one non-air supply compressor can be used, wherein the air supply compressor 1 is used to implement a vehicle heat pump with waste heat recovery. Multiple compressors can be connected in series or in parallel. The air supply compressor 1 can be a low-temperature heat pump compressor with an intermediate air supply function. The specific number and type of compressors in the compression unit and the specific number of air supply branches 14 are not limited and can be flexibly set according to actual conditions.

[0047] Furthermore, in each of the above embodiments, the in-vehicle heat exchange unit includes an in-vehicle heat exchanger 3, an air conditioning duct, and an in-vehicle fan 4. The in-vehicle heat exchanger 3 and in-vehicle fan 4 are located in the in-vehicle air duct and are used to absorb heat for cooling and release heat for heating. The out-vehicle heat exchange unit includes an out-vehicle heat exchanger 6 and an out-vehicle fan 7. Out-vehicle heat exchanger 6 is used to exchange heat between the refrigerant in the main branch of the heat pump air conditioning system and the outside environment. One end of the out-vehicle heat exchanger 6 is connected to the four-way valve 2, and the other end is connected to the main expansion valve 5.

[0048] Based on the above embodiments, this embodiment further provides an electric vehicle, which includes the electric vehicle heat pump air conditioning system described in any of the above embodiments. Furthermore, the electric vehicle also includes a vehicle body, an interior air duct, a motor, a battery, and electronic control components.

[0049] On the basis of the above embodiments, this embodiment further provides an electric vehicle heat pump air conditioning system to solve or partially solve the problem that the existing electric vehicle heat pump air conditioning has low heating capacity and efficiency in low temperature environment, poor heating effect, and difficulty in meeting usage requirements. Figure 1The electric vehicle heat pump air conditioning system includes a compressor, a four-way valve 2, an in-vehicle heat exchange unit, a main expansion valve 5, and an out-vehicle heat exchange unit connected by pipelines; the compressor is a compressor with an air supply function; it also includes an air supply expansion valve 9, an intermediate heat exchanger 10, and a waste heat exchanger 11; the air supply expansion valve 9, the intermediate heat exchanger 10, and the waste heat exchanger 11 are connected in sequence through pipelines to form an air supply branch 14 of the electric vehicle heat pump air conditioning system; the waste heat exchanger 11 is used for heat exchange between the coolant of the vehicle motor, battery, or electronic control and the refrigerant of the air supply branch 14 of the heat pump air conditioning system.

[0050] The electric vehicle heat pump air conditioning system provided in this embodiment refers to Figure 3 In cooling mode, the compressor outlet is connected to the inlet of the external heat exchanger 6 through the four-way valve 2. The first solenoid valve 12 is closed, the second solenoid valve 13 is open, the main expansion valve 5 is partially opened to throttle the refrigerant, and the air expansion valve 9 is fully opened. The waste heat exchanger 11 is connected in parallel with the internal heat exchanger 3 to achieve both internal cooling and cooling of the battery, motor, or electronic control coolant. Figure 2 In heating mode, the compressor outlet is connected to the inlet of the in-vehicle heat exchanger 3; the first solenoid valve 12 is open, the second solenoid valve 13 is closed, the air supply expansion valve 9 is partially open, and the waste heat exchanger 11 is connected in series to the air supply branch 14 of the air conditioning system to recover heat from the battery, motor, or electronic control coolant. By recovering heat from the battery, motor, or electronic control coolant, additional heat absorption is achieved. By placing the waste heat exchanger 11 in the air supply branch 14, the working fluid temperature at the compressor air supply inlet is aligned with the temperature of the battery, motor, or electronic control coolant, improving the system's waste heat recovery efficiency and the overall efficiency of the heat pump.

[0051] like Figures 4 to 6 As shown, this embodiment provides another electric vehicle heat pump air-conditioning system, including a compressor, a four-way valve 2, an in-vehicle heat exchange unit, a main expansion valve 5, and an out-vehicle heat exchange unit connected by pipelines, and the compressor is a compressor with an air supply function; it also includes an air supply expansion valve 9, a waste heat heat exchanger 11 and an intermediate heat exchanger 10; the air supply expansion valve 9 is connected to the waste heat exchanger 11 and the intermediate heat exchanger 10 in sequence through pipelines to form an air supply branch 14 of the electric vehicle heat pump air-conditioning system, and the waste heat exchanger 11 is used for heat exchange between the coolant of the vehicle motor or battery or electronic control and the refrigerant of the air supply branch 14 of the heat pump air-conditioning system.

[0052] The electric vehicle heat pump air conditioning system provided in this embodiment refers to Figure 6 In cooling mode, the compressor outlet is connected to the inlet of the external heat exchanger 6 through the four-way valve 2, the first solenoid valve 12 is closed, the second solenoid valve 13 is open, and the air expansion valve 9 is fully open; the waste heat exchanger 11 is connected in parallel with the internal heat exchanger 3 to achieve both internal cooling and cooling of the battery, motor, or electronic control coolant. Figure 5In heating mode, the compressor outlet is connected to the inlet of the in-vehicle heat exchanger 3, the first solenoid valve 12 is open, the second solenoid valve 13 is closed, the air supply expansion valve 9 is partially open, and the waste heat exchanger 11 is connected in series to the air supply branch 14 of the air conditioning system to recover heat from the battery, motor, or electronic control coolant. This heat recovery from the battery, motor, or electronic control coolant provides additional heat absorption. By placing the waste heat recovery heat exchanger in the air supply branch 14, the working fluid temperature at the compressor air supply inlet is aligned with the temperature of the battery, motor, or electronic control coolant, improving the system's waste heat recovery efficiency and the overall efficiency of the heat pump.

[0053] The electric vehicle heat pump air conditioning system provided by the present invention effectively increases the heat absorption of the external heat exchange unit in low-temperature environments while simultaneously recovering waste heat from the battery, motor, or electronic control coolant, thereby increasing the additional heat absorption benefit of the compressor. This effectively increases heating capacity and improves heating efficiency, achieving excellent heating results and meeting the requirements for heat pump air conditioning systems in even more extreme cold conditions. Furthermore, in summer, cooling of the battery, motor, or electronic control liquid is achieved while also improving refrigeration efficiency.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An electric vehicle heat pump air conditioning system, characterized in that: It includes a compression unit, a four-way valve, an in-vehicle heat exchange unit, a main line expansion valve and an external heat exchange unit connected by pipes to form a loop; it also includes an air supply branch line, an air supply expansion valve and an intermediate heat exchanger; The compression unit includes an air supply compressor, a first end of the air supply branch is connected to the air supply port of the air supply compressor, and a second end of the air supply branch is connected to the pipeline between the in-vehicle heat exchange unit and the main expansion valve; the low-temperature side of the intermediate heat exchanger and the air supply expansion valve are respectively arranged in series on the air supply branch, and the high-temperature side of the intermediate heat exchanger is arranged in series on the pipeline between the in-vehicle heat exchange unit and the main expansion valve; The refrigerant at the outlet of the in-vehicle heat exchange unit is divided into two branches through a pipeline, one of which is connected to the air-supply expansion valve to form a refrigerant air-supply branch, and the other is connected to the main expansion valve to form a main branch of the heating system, and the main branch flows through the intermediate heat exchanger; The temperature of the refrigerant entering the air-supplementing branch is further reduced after flowing through the air-supplementing expansion valve; the refrigerants in the two branches branched from the outlet of the in-vehicle heat exchange unit undergo heat exchange in the intermediate heat exchanger, so that the temperature of the refrigerant in the main branch is further reduced, which is conducive to improving the heat absorption superheat degree; The air supply branch also flows through at least one of the motor, battery, and electronic control of the vehicle, exchanges heat with the coolant in at least one of the motor, battery, and electronic control of the vehicle, absorbs heat from the coolant, and then flows to the compression unit; The compression unit includes a plurality of the air-supplementing compressors arranged in series and / or in parallel, and at least one of the air-supplementing compressors is connected to the air-supplementing branch; The compression unit further includes a non-supplemental air compressor.

2. The electric vehicle heat pump air conditioning system according to claim 1, characterized in that: The first end of the air supply branch is also connected to the air inlet pipeline of the air supply compressor.

3. The electric vehicle heat pump air conditioning system according to claim 2, characterized in that: A first solenoid valve is provided between the first end of the air supply branch and the air supply port of the air supply compressor; a second solenoid valve is provided between the first end of the air supply branch and the air inlet pipeline of the air supply compressor.

4. The electric vehicle heat pump air conditioning system according to claim 2, characterized in that: A gas-liquid separator is provided on the air inlet pipeline of the air supply compressor.

5. The electric vehicle heat pump air conditioning system according to any one of claims 1 to 4, characterized in that: The air-supplementing expansion valve is arranged close to the second end of the air-supplementing branch.

6. The electric vehicle heat pump air conditioning system according to claim 5, characterized in that: At least one of the motor, battery and electronic control of the automobile is provided with a waste heat exchanger, and the low-temperature side of the waste heat exchanger is connected in series with the air supply branch.

7. The electric vehicle heat pump air conditioning system according to claim 6, characterized in that: The intermediate heat exchanger is provided between the air-supplementing expansion valve and the waste heat exchanger, or the waste heat exchanger is provided between the air-supplementing expansion valve and the intermediate heat exchanger.

8. An electric vehicle, characterized in that: The electric vehicle heat pump air conditioning system comprises any one of claims 1 to 7.

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