Enthalpy-increasing air conditioning system, electric automobile and control method of enthalpy-increasing air conditioning system

Abstract

According to the enthalpy-increasing air conditioning system, the electric automobile and the control method of the enthalpy-increasing air conditioning system, the enthalpy-increasing air conditioning system is additionally provided with the first bypass pipeline, the second bypass pipeline and the control valve assembly, so that the enthalpy-increasing air conditioning system can still work in an indoor heating mode or an indoor refrigerating mode; refrigerants can enter from the same inlet of the economizer, so that the refrigerants flowing out of the economizer channel can achieve the enthalpy increasing function on the compressor under any condition; in addition, in the indoor heating mode, the refrigerant flowing out of the first channel of the economizer can be divided into three paths, the first path flows to the outdoor heat exchanger through a first throttling valve, the second path flows to the second channel of the economizer through a second throttling valve, and the third path flows to the battery heat dissipation heat exchanger through a third throttling valve. And the third path of refrigerant flows back to the compressor after absorbing the heat of the battery assembly in the battery heat dissipation heat exchanger, so that battery cooling can be started during indoor heating, the heat of the battery can be recycled, and the energy loss can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of temperature control equipment, and in particular to an enthalpy-increasing air-conditioning system, an electric vehicle, and a control method for the enthalpy-increasing air-conditioning system. Background Art

[0002] The existing air-conditioning systems of electric vehicles are mostly implemented through compressors, outdoor heat exchangers, economizers, throttle valves, indoor heat exchangers and other devices when heating at low temperatures. The purpose of setting up the economizer and the corresponding throttle valve is to increase the enthalpy of the compressor, broaden the operating range of the heat pump system, and improve its heating effect. Some vehicle battery thermal management systems are also independent systems, while others are integrated into the air-conditioning system, and a heat exchanger is connected in parallel with the indoor heat exchanger to dissipate the heat of the battery coolant. In the process of realizing this application, the inventors found that there are at least the following problems in the prior art: At present, the existing enthalpy-increasing air-conditioning system can only use the economizer to increase enthalpy when heating indoors, but when cooling is required indoors, the enthalpy-increasing function cannot be achieved, and the compressor energy efficiency ratio is not high. In addition, battery cooling cannot be turned on when heating is required indoors, and the battery heat cannot be recycled. Summary of the invention

[0003] Based on this, the present application provides an enthalpy-increasing air-conditioning system, an electric vehicle and a control method for the enthalpy-increasing air-conditioning system, so as to improve the problems in the prior art that the compressor enthalpy increase cannot be achieved during indoor cooling and the battery cooling cannot be turned on during indoor heating, thereby improving the energy efficiency ratio of the compressor and reducing energy consumption.

[0004] To achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides an enthalpy-increasing air conditioning system, comprising: a compressor, a reversing valve, an indoor heat exchanger, an economizer, an outdoor heat exchanger, a first throttle valve, a second throttle valve, a first bypass pipeline, a control valve assembly, and a second bypass pipeline; and further comprising a battery thermal management system, wherein the battery thermal management system comprises a battery heat dissipation heat exchanger and a third throttle valve;

[0006] Wherein: the economizer comprises a first channel and a second channel which can exchange heat with each other, the indoor heat exchanger, the first channel, the first throttle valve and the outdoor heat exchanger are connected in series in sequence, the inlet of the second throttle valve is connected between the first channel and the first throttle valve, the outlet of the second throttle valve is connected to the inlet of the second channel, and the outlet of the second channel is connected to the enthalpy increase port of the compressor; one end of the first bypass pipeline and the second bypass pipeline are respectively connected between the outdoor heat exchanger and the first throttle valve, and the other end is respectively connected between the indoor heat exchanger and the first channel;

[0007] The inlet of the third throttle valve is connected between the first channel and the first throttle valve, the outlet of the third throttle valve is connected to the inlet of the battery heat dissipation heat exchanger, the outlet of the battery heat dissipation heat exchanger is connected to the air intake of the compressor, and the battery heat dissipation heat exchanger is used to perform heat exchange with the battery assembly;

[0008] In the indoor heating mode, the exhaust port of the compressor is connected to the indoor heat exchanger through the reversing valve, and the outdoor heat exchanger is connected to the air intake port through the reversing valve, and the control valve assembly is used to close the first bypass pipeline and the second bypass pipeline, and can control the refrigerant to flow through the indoor heat exchanger, the first channel and the outdoor heat exchanger in sequence;

[0009] In the indoor cooling mode, the exhaust port is connected to the outdoor heat exchanger through the reversing valve, and the indoor heat exchanger is connected to the intake port through the reversing valve. The control valve assembly is used to open the first bypass line and the second bypass line, and can control the refrigerant to flow through the outdoor heat exchanger, the first bypass line, the first channel, the second bypass line and the indoor heat exchanger in sequence.

[0010] In one embodiment, the enthalpy-increasing air conditioning system further includes a gas-liquid separator and a drying filter; the reversing valve includes a first interface, a second interface, a third interface and a fourth interface; the economizer includes a first channel and a second channel;

[0011] The outlet of the gas-liquid separator is connected to the air intake port, the exhaust port is connected to the first interface, the inlet of the gas-liquid separator is connected to the fourth interface and the outlet of the battery heat dissipation heat exchanger, the indoor heat exchanger, the first channel, the first throttle valve, the drying filter and the outdoor heat exchanger are connected in series in sequence, one port of the outdoor heat exchanger is connected to the second interface, and one port of the indoor heat exchanger is connected to the third interface to form a circulation loop.

[0012] In one embodiment, the two ends of the first bypass pipeline are respectively connected to the first connection point and the second connection point of the main pipeline, and the two ends of the second bypass pipeline are respectively connected to the third connection point and the fourth connection point of the main pipeline; the first connection point and the third connection point are respectively located between the outdoor heat exchanger and the first throttle valve, and the first connection point is arranged close to the outdoor heat exchanger; the second connection point and the fourth connection point are respectively located between the indoor heat exchanger and the first channel, and the second connection point is arranged close to the economizer.

[0013] In one embodiment, the control valve assembly includes a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve, the first one-way valve is arranged on the main line between the first connection point and the third connection point, the second one-way valve is arranged on the second bypass line, the third one-way valve is arranged on the first bypass line, and the fourth one-way valve is arranged on the main line between the second connection point and the fourth connection point.

[0014] In one embodiment, the battery heat dissipation heat exchanger includes a first flow channel and a second flow channel that can exchange heat with each other; the inlet of the first flow channel is connected to the outlet of the third throttle valve, and the outlet of the first flow channel is connected to the inlet of the gas-liquid separator; the second flow channel is used to circulate a coolant, and the coolant is used to exchange heat with the battery assembly.

[0015] In one of the embodiments, the battery thermal management system further includes a circulation pump and a heat exchange plate cyclically connected to the second flow channel, and the heat exchange plate is used for exchanging heat with the battery assembly.

[0016] In one of the embodiments, the enthalpy-added air conditioning system further includes a water temperature detection device and a room temperature detection device, wherein the water temperature detection device is used to detect the temperature of the refrigerant flowing out of the heat exchange plate, and the room temperature detection device is used to detect the temperature of the indoor environment in which the indoor heat exchanger is located.

[0017] In a second aspect, an embodiment of the present application provides an electric vehicle, comprising the enthalpy-added air-conditioning system as described above.

[0018] In a third aspect, an embodiment of the present application provides a control method for an enthalpy-increasing air-conditioning system, which is applied to the enthalpy-increasing air-conditioning system as described above.

[0019] The control method of the enthalpy-increasing air conditioning system controls the enthalpy-increasing air conditioning system to enter a standby state in an indoor heating mode, and performs the following steps:

[0020] S10, setting the indoor preset temperature T10;

[0021] S12, real-time detection of the actual indoor temperature T11, and determination of whether T10>T11 is established, if so, starting the compressor, the first throttle valve and the second throttle valve, closing the first bypass pipeline and the second bypass pipeline, and the control valve assembly controls the refrigerant to flow through the indoor heat exchanger and the first channel in sequence, and then flow to the outdoor heat exchanger and the second channel respectively; if not, closing the first throttle valve;

[0022] S13, repeating step S12 until the enthalpy-increasing air-conditioning system exits the heating mode;

[0023] The control method of the enthalpy-increasing air-conditioning system controls the enthalpy-increasing air-conditioning system to enter the standby state in the indoor cooling mode, and the following steps are executed:

[0024] S20. Set the indoor preset temperature T20;

[0025] S22. Turn on the indoor fan ventilation mode, detect the indoor actual temperature T21 in real time, and judge whether T20 < T21 holds. If so, start the compressor, the first throttle valve, and the second throttle valve, open the first bypass pipeline and the second bypass pipeline, and the control valve assembly controls the refrigerant to flow through the outdoor heat exchanger, the first bypass pipeline, and the first channel in sequence, and then flow to the second bypass pipeline and the second channel respectively; if not, close the first throttle valve;

[0026] S23. Repeat step S22 until the enthalpy-increasing air-conditioning system exits the cooling mode.

[0027] In one embodiment, the enthalpy-increasing air-conditioning system further includes a battery thermal management system, and the battery thermal management system includes a battery heat dissipation heat exchanger and a third throttle valve connected in series; the battery heat dissipation heat exchanger includes a first flow channel and a second flow channel that can exchange heat with each other; the outlet of the first flow channel is connected to the suction port of the compressor, and the inlet of the third throttle valve is connected to the outlet of the first channel; the battery thermal management system further includes a circulation pump and a heat exchange plate that are circularly communicated with the second flow channel, and the heat exchange plate is used for exchanging heat with the battery assembly;

[0028] In the indoor heating mode, the control method of the enthalpy-increasing air-conditioning system further includes the following steps:

[0029] S30. Set the preset outlet water temperature T33 of the heat exchange plate;

[0030] S31. Detect the actual outlet water temperature T32 of the heat exchange plate in real time, and judge whether T32 > T33 holds.

[0031] If so, turn on the compressor, the second throttle valve, the third throttle valve, and the circulation pump, and close the first bypass pipeline and the second bypass pipeline; the control valve assembly controls the refrigerant to flow through the indoor heat exchanger and the first channel in sequence, and then flow to the battery heat dissipation heat exchanger and the second channel respectively; if not, close the third throttle valve and the circulation pump;

[0032] S32. Repeat step S31 until the battery assembly stops working;

[0033] In the indoor cooling mode, the control method of the enthalpy-increasing air-conditioning system further includes the following steps:

[0034] S40, setting a preset outlet water temperature T43 of the heat exchange plate;

[0035] S41, real-time detection of the actual outlet water temperature T42 of the heat exchange plate is performed to determine whether T42>T43 is established. If so, the compressor, the second throttle valve, the third throttle valve, the circulation pump and the first bypass pipeline are turned on; the control valve assembly controls the refrigerant to flow through the outdoor heat exchanger, the first bypass pipeline and the first channel in sequence, and then flow to the second channel and the third throttle valve respectively; if not, the third throttle valve and the circulation pump are closed;

[0036] S42. Repeat step S41 until the battery assembly stops working.

[0037] The present application has at least the following beneficial effects: the enthalpy-increasing air-conditioning system provided in the present application adds a first bypass pipeline, a second bypass pipeline and a control valve assembly to the structure of the traditional enthalpy-increasing air-conditioning system, so that the refrigerant of the enthalpy-increasing air-conditioning system can enter from the same inlet of the economizer whether in the indoor heating mode or the indoor cooling mode, so that the refrigerant flowing out of the economizer channel can realize the enthalpy-increasing function of the compressor under any circumstances; in addition, in the indoor heating mode, the refrigerant flowing out of the first channel of the economizer can be divided into three paths: the first path flows to the outdoor heat exchanger through the first throttle valve, the second path flows to the second channel of the economizer through the second throttle valve, and the third path flows to the battery heat dissipation heat exchanger through the third throttle valve. The third path of refrigerant absorbs the heat of the battery assembly in the battery heat dissipation heat exchanger and then flows back to the compressor, so that the battery cooling can be turned on during indoor heating to recover the battery heat, which helps to reduce energy loss. The enthalpy-increasing air conditioning system provided in the present application can realize the dual-mode enthalpy-increasing function of cooling and heating by modifying the existing air conditioner, and the modification range is small, the equipment investment cost is low, and it can effectively improve the energy efficiency ratio of the compressor during cooling and reduce energy consumption. The control method of the electric vehicle and the enthalpy-increasing air conditioning system provided in the present application includes the above-mentioned enthalpy-increasing air conditioning system, and therefore also has the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of an enthalpy-increasing air-conditioning system according to an embodiment of the present application.

[0039] Figure 2 This is a structural schematic diagram of an enthalpy-increasing air-conditioning system according to another embodiment of the present application.

[0040] Figure 3 for Figure 1 Schematic diagram of the refrigerant and coolant flow in the enthalpy increase air-conditioning system in indoor heating mode.

[0041] Figure 4 for Figure 1Schematic diagram of the refrigerant and coolant flow in the enthalpy increase air-conditioning system in indoor cooling mode.

[0042] Figure 5 for Figure 1 Schematic diagram of the control method flow of the enthalpy increase air-conditioning system in the indoor heating mode.

[0043] Figure 6 for Figure 1 Schematic diagram of the control method flow of the enthalpy increase air-conditioning system in indoor cooling mode.

[0044] The meanings of the symbols in the accompanying drawings are as follows:

[0045] 10. compressor; 11. four-way reversing valve; 111. first interface; 112. second interface; 113. third interface; 114. fourth interface; 12. gas-liquid separator;

[0046] 20. Indoor temperature control system; 21. Indoor heat exchanger; 211. Indoor fan; 22. Fourth one-way valve; 23. Economizer; 231. Second throttle valve; 232. First channel; 233. Second channel; 24. First throttle valve; 25. First one-way valve; 26. Dry filter; 27. Outdoor heat exchanger; 28. First bypass pipeline; 281. Third one-way valve; 282. First connection point; 283. Second connection point; 29. ​​Second bypass pipeline; 291. Second one-way valve; 292. Third connection point; 293. Fourth connection point;

[0047] 30. Battery thermal management system; 31. Battery heat dissipation heat exchanger; 311. First flow channel; 312. Second flow channel; 32. Third throttle valve; 33. Circulation pump; 34. Heat exchange plate; 35. Expansion water tank. DETAILED DESCRIPTION

[0048] The technical solution of the present application is further elaborated in detail below in conjunction with the accompanying drawings and specific embodiments of the specification.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the implementation of this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0050] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating positions or positional relationships, are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] See also Figure 1 and Figure 2 The enthalpy-increasing air-conditioning system of the embodiment of the present application comprises: a compressor 10, a reversing valve, an indoor heat exchanger 21, an economizer 23, an outdoor heat exchanger 27, a first throttle valve 24, and a second throttle valve 231; the economizer 23 is arranged between the indoor heat exchanger 21 and the outdoor heat exchanger 27, and a channel of the economizer 23 is connected to the enthalpy-increasing port of the compressor 10; more specifically, the economizer 23 comprises a first channel 232 and a second channel 233 that can exchange heat with each other, the indoor heat exchanger 21, the first channel 232, the first throttle valve 24 and the outdoor heat exchanger 27 are connected in series in sequence, and the second throttle valve 231 is connected to the outdoor heat exchanger 27. The inlet is connected between the first channel 232 and the first throttle valve 24, the outlet of the second throttle valve 231 is connected to the inlet of the second channel 233, and the outlet of the second channel 233 is connected to the enthalpy increase port of the compressor 10; the enthalpy increase air-conditioning system also includes a first bypass pipe 28, a control valve assembly and a second bypass pipe 29, one end of the first bypass pipe 28 and the second bypass pipe 29 are respectively connected between the outdoor heat exchanger 27 and the first throttle valve 24, and the other ends of the first bypass pipe 28 and the second bypass pipe 29 are respectively connected between the indoor heat exchanger 21 and the first channel 232 of the economizer 23.

[0053] The enthalpy-added air conditioning system also includes a battery thermal management system 30, which includes a battery heat dissipation heat exchanger 31 and a third throttle valve 32; the inlet of the third throttle valve 32 is connected between the first channel 232 and the first throttle valve 24, and the outlet of the third throttle valve 32 is connected to the inlet of the battery heat dissipation heat exchanger 31, and the outlet of the battery heat dissipation heat exchanger 31 is connected to the intake port of the compressor 10 (also referred to as the inlet of the compressor 10). The battery heat dissipation heat exchanger 31 is used to perform heat exchange with the battery assembly to meet the heat dissipation requirements of the battery assembly.

[0054] In the indoor heating mode, the exhaust port of the compressor 10 (also referred to as the outlet of the compressor 10) is connected to the indoor heat exchanger 21 through a reversing valve, and the outdoor heat exchanger 27 is connected to the intake port of the compressor 10 through a reversing valve to realize a heating cycle; the control valve assembly is used to close the first bypass line 28 and the second bypass line 29, and at the same time can control the refrigerant to flow through the indoor heat exchanger 21, the first channel 232 of the economizer 23 and the outdoor heat exchanger 27 in sequence.

[0055] In the indoor cooling mode, the exhaust port of the compressor 10 is connected to the outdoor heat exchanger 27 through the reversing valve, and the indoor heat exchanger 21 is connected to the air intake port of the compressor 10 through the reversing valve to realize the refrigeration cycle; the control valve assembly is used to open the first bypass pipeline 28 and the second bypass pipeline 29, and control the refrigerant to flow through the outdoor heat exchanger 27, the first bypass pipeline 28, the first channel 232 of the economizer 23, the second bypass pipeline 29 and the indoor heat exchanger 21 in sequence. In this embodiment, the first throttle valve 24, the second throttle valve 231, and the third throttle valve 32 can all be expansion valves, such as electronic expansion valves.

[0056] Specifically, in this embodiment, the enthalpy-increasing air conditioning system includes a compressor 10, a gas-liquid separator 12 and a reversing valve. The reversing valve in this embodiment can adopt a four-way reversing valve 11, and the four-way reversing valve 11 includes a first interface 111, a second interface 112, a third interface 113 and a fourth interface 114. The exhaust port of the compressor 10 is connected to the first interface 111, the air intake port of the compressor 10 is connected to the outlet of the gas-liquid separator 12, and the inlet of the gas-liquid separator 12 is respectively connected to the fourth interface 114 and the outlet of the battery heat dissipation heat exchanger 31.

[0057] In this embodiment, the component of the enthalpy-added air conditioning system for adjusting the indoor temperature is defined as an indoor temperature control system 20, and the indoor temperature control system 20 may include an indoor heat exchanger 21, an economizer 23, a first throttle valve 24, a second throttle valve 231, a drying filter 26, and an outdoor heat exchanger 27. In this embodiment, both the indoor heat exchanger 21 and the outdoor heat exchanger 27 may adopt a coil heat exchanger, and an indoor fan 211 is correspondingly provided at the indoor heat exchanger 21, and an outdoor fan is correspondingly provided at the outdoor heat exchanger 27. It can be understood that fans can be respectively provided on the air inlet side or the air outlet side of the indoor heat exchanger 21 and the outdoor heat exchanger 27 to improve the heat exchange effect of the heat exchanger through forced convection heat exchange. The economizer 23 of this embodiment may adopt a plate heat exchanger, including a first channel 232 and a second channel 233 that can exchange heat with each other. The indoor heat exchanger 21, the first channel 232, the first throttle valve 24, the filter drier 26 and the outdoor heat exchanger 27 can be connected in series in sequence on the main pipe of the enthalpy-increasing air conditioning system. The port of the indoor heat exchanger 21 away from the economizer 23 is connected to the third interface 113, and the port of the outdoor heat exchanger 27 away from the filter drier 26 is connected to the second interface 112. After the second throttle valve 231 and the second channel 233 of the economizer 23 are connected in series, the inlet of the second throttle valve 231 can be connected to the main pipe between the first channel 232 and the first throttle valve 24, and the outlet of the second channel 233 is connected to the enthalpy-increasing port of the compressor 10. In the indoor heating mode, the first interface 111 of the reversing valve is connected to the third interface 113, and the second interface 112 of the reversing valve is connected to the fourth interface 114; while in the indoor cooling mode, the first interface 111 of the reversing valve is connected to the second interface 112, and the third interface 113 of the reversing valve is connected to the fourth interface 114.

[0058] The two ends of the first bypass pipeline 28 are respectively connected to the first connection point 282 and the second connection point 283 of the main pipeline, and the two ends of the second bypass pipeline 29 are respectively connected to the third connection point 292 and the fourth connection point 293 of the main pipeline. The first connection point 282 and the third connection point 292 are respectively located between the outdoor heat exchanger 27 and the first throttle valve 24, and the first connection point 282 is arranged close to the outdoor heat exchanger 27; the second connection point 283 and the fourth connection point 293 are respectively located between the indoor heat exchanger 21 and the first channel 232, and the second connection point 283 is arranged close to the economizer 23. The first bypass pipeline 28 and the second bypass pipeline 29 are not connected to each other.

[0059] The control valve assembly of this embodiment includes a first check valve 25, a second check valve 291, a third check valve 281 and a fourth check valve 22. The first check valve 25 is arranged on the main pipe between the first connection point 282 and the third connection point 292, the second check valve 291 is arranged on the second bypass pipe 29, the third check valve 281 is arranged on the first bypass pipe 28, and the fourth check valve 22 is arranged on the main pipe between the second connection point 283 and the fourth connection point 293. The flow direction of the first check valve 25 is from the first throttle valve 24 to the dry filter 26, the flow direction of the second check valve 291 is from the first throttle valve 24 to the indoor heat exchanger 21, the flow direction of the third check valve 281 is from the dry filter 26 to the first channel 232, and the flow direction of the fourth check valve 22 is from the indoor heat exchanger 21 to the first channel 232. It can be understood that in some other embodiments, solenoid valves can also be used to replace the check valves to achieve the above solution.

[0060] like Figure 3 As shown, in the indoor heating mode, the working principle of the enthalpy-increasing air-conditioning system is as follows: first, the first interface 111 and the third interface 113 of the four-way reversing valve 11 are connected, and the second interface 112 and the fourth interface 114 are connected. The low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure steam (gaseous refrigerant) by the compressor 10, and enters the indoor heat exchanger 21 after passing through the first interface 111 and the third interface 113 of the four-way reversing valve 11, and exchanges heat with the indoor gas through the forced convection of the indoor fan 211. The indoor gas is heated, and the refrigerant releases heat and condenses into medium-temperature and high-pressure liquid refrigerant, and enters the first channel of the economizer 23 after passing through the fourth one-way valve 22. The refrigerant in the second channel 232 is further cooled (supercooled) by heat exchange with the refrigerant after the second throttle valve 231 (the refrigerant in the second channel 233). At this time, the refrigerant can be divided into two paths. The refrigerant in the first branch is throttled by the first throttle valve 24 to become a low-temperature and low-pressure liquid refrigerant (or a gas-liquid mixture), and enters the outdoor heat exchanger 27 after passing through the first one-way valve 25 and the drying filter 26. The refrigerant in the outdoor heat exchanger 27 exchanges heat with the outdoor air through forced convection of the outdoor fan, absorbs heat and evaporates to form a low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant passes through the second interface 112 and the fourth interface 114, and then returns to the compressor 10 through the gas-liquid separator 12. The refrigerant in the second branch is throttled by the second throttle valve 231 into a low-temperature and low-pressure liquid refrigerant (or a gas-liquid mixture), enters the second channel 233 of the economizer 23, absorbs the heat of the refrigerant in the first channel 232, evaporates into a low-temperature and low-pressure gaseous refrigerant, and then directly enters the enthalpy increase port of the compressor 10, completing a heating cycle.

[0061] like Figure 4As shown, in the indoor cooling mode, the first interface 111 and the second interface 112 of the four-way reversing valve 11 are connected, and the third interface 113 and the fourth interface 114 are connected. The low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure steam by the compressor 10, and enters the outdoor heat exchanger 27 after passing through the first interface 111 and the second interface 112 of the four-way reversing valve 11, and exchanges heat with the outdoor gas through the forced convection of the outdoor fan. After releasing heat, the refrigerant condenses into medium-temperature and high-pressure liquid refrigerant, passes through the drying filter 26, enters the first bypass pipeline 28, passes through the third one-way valve 281, and enters the first channel 232 of the economizer 23 and the second throttle valve 2 The refrigerant after 31 (the refrigerant in the second channel 233) is further cooled (supercooled) through heat exchange. At this time, the refrigerant can be divided into two paths. The refrigerant in the first branch is throttled by the first throttle valve 24 to become a low-temperature and low-pressure liquid refrigerant, enters the second bypass pipeline 29, and enters the indoor heat exchanger 21 after passing through the second one-way valve 291. The refrigerant in the indoor heat exchanger 21 exchanges heat with the indoor air through forced convection of the indoor fan 211, and the indoor air is cooled. The refrigerant absorbs heat and evaporates to form a low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant passes through the third interface 113 and the fourth interface 114, and then returns to the compressor 10 through the gas-liquid separator 12. The refrigerant in the second branch is throttled by the second throttle valve 231 into a low-temperature and low-pressure liquid refrigerant, enters the second channel 233 of the economizer 23, absorbs the heat of the refrigerant in the first channel 232, evaporates into a low-temperature and low-pressure gaseous refrigerant, and then directly enters the enthalpy increase port of the compressor 10, completing a refrigeration cycle.

[0062] It can be seen from the above that the enthalpy-increasing air-conditioning system of the embodiment of the present application can realize the enthalpy-increasing function of the compressor 10 whether in the indoor heating mode or in the indoor cooling mode, and can improve the performance of the compressor 10 in both the heating and cooling modes, which is beneficial to reducing energy consumption; in addition, in the indoor heating mode, the refrigerant flowing out from the first channel 232 of the economizer 23 can be divided into three paths: the first path flows to the outdoor heat exchanger 21 through the first throttle valve 24, the second path flows to the second channel 233 of the economizer 23 through the second throttle valve 231, and the third path flows to the battery heat dissipation heat exchanger 31 through the third throttle valve 32. The third path of refrigerant absorbs the heat of the battery component in the battery heat dissipation heat exchanger 31 and flows back to the compressor 10, so that the battery cooling can be turned on during indoor heating to recover the battery heat, which helps to reduce energy loss. Moreover, the enthalpy-added air-conditioning system of the embodiment of the present application can be improved on the basis of the original ordinary enthalpy-added air-conditioning system (which cannot realize the enthalpy-added function during cooling). It only needs to add a first bypass line 28, a second bypass line 29 and a control valve assembly. The number of equipment components is small and the investment cost is low.

[0063] like Figure 1As shown, the enthalpy-added air conditioning system of the embodiment of the present application can also be coupled to the battery thermal management system 30. The battery thermal management system 30 of this embodiment includes a battery heat dissipation heat exchanger 31 and a third throttle valve 32. The battery heat dissipation heat exchanger 31 can adopt a plate heat exchanger, including a first flow channel 311 and a second flow channel 312 that can exchange heat with each other. The inlet of the first flow channel 311 is connected to the outlet of the third throttle valve 32, and the outlet of the first flow channel 311 is connected to the inlet of the gas-liquid separator 12, and the inlet of the third throttle valve 32 can be connected to the outlet of the first channel 232; the second flow channel 312 is used to circulate the coolant, and the coolant is used to exchange heat with the battery assembly.

[0064] Specifically, in this embodiment, the battery thermal management system 30 further includes a circulating pump 33 and a heat exchange plate 34 connected in series. The heat exchange plate 34 is used to circulate the coolant to exchange heat with the battery assembly to reduce the temperature of the battery assembly. The inlet of the circulating pump 33 is connected to the outlet of the second flow channel 312 of the battery heat dissipation heat exchanger 31, and the outlet of the heat exchange plate 34 is connected to the inlet of the second flow channel 312 of the battery heat dissipation heat exchanger 31.

[0065] The battery thermal management system 30 of this embodiment further includes an expansion water tank 35, which is connected in parallel with the heat exchange plate 34 and the circulation pump 33. The inlet of the expansion water tank 35 is connected to the pipeline between the second flow channel 312 and the heat exchange plate 34, and the outlet of the expansion water tank 35 is connected to the pipeline between the second flow channel 312 and the circulation pump 33. The expansion water tank 35 is connected in parallel with the heat exchange plate 34 and the circulation pump 33, and can replenish the coolant system before the circulation pump 33 discharges water, and can also play a role in exhausting gas after the heat exchange plate 34 discharges liquid.

[0066] The enthalpy-added air conditioning system of this embodiment can realize the heat dissipation function of the battery assembly in both the indoor heating mode and the indoor cooling mode. In the indoor heating mode, if the compressor 10 is turned on and is used to heat the indoor temperature, the refrigerant passes through the fourth one-way valve 22 and enters the first channel 232, and is divided into three paths. The circulation principle of the first branch and the second branch has been explained in the above embodiment and will not be repeated here. The third branch enters the first channel 232 of the battery heat dissipation heat exchanger 31 through the third throttle valve 32 and then merges with the first branch before the inlet of the gas-liquid separator 12. After entering the gas-liquid separator 12 together, it returns to the inlet of the compressor 10. In the indoor cooling mode, if the compressor 10 is turned on and is used to cool the room, the refrigerant passes through the third one-way valve 281, enters the economizer 23 and the first channel 232, and is divided into three paths. The circulation principle of the first branch and the second branch has been explained in the above embodiment and will not be repeated here. The third branch enters the first channel 232 of the battery heat dissipation heat exchanger 31 through the third throttle valve 32 and merges with the first branch before the entrance of the gas-liquid separator 12. After entering the gas-liquid separator 12 together, they return to the entrance of the compressor 10. In other words, the enthalpy-added air conditioning system can bring the heat from the battery assembly back to the compressor 10, whether in the indoor heating mode or the indoor cooling mode, thereby recovering the battery heat and helping to reduce energy loss.

[0067] In some embodiments, the enthalpy-increasing air conditioning system may further include a water temperature detection device (not shown) and a room temperature detection device (not shown), the water temperature detection device is used to detect the temperature of the refrigerant flowing out of the heat exchange plate 34, and the room temperature detection device is used to detect the temperature of the indoor environment where the indoor heat exchanger 21 is located. The water temperature detection device and the room temperature detection device may be, for example, temperature sensors, the water temperature detection device may be, for example, disposed on the pipeline between the heat exchange plate 34 and the second flow channel 312, and the room temperature detection device may be, for example, disposed near the indoor heat exchanger 21.

[0068] An embodiment of the present application also provides an electric vehicle, comprising the enthalpy-added air-conditioning system of the above embodiment.

[0069] The embodiment of the present application also provides a control method of an enthalpy-increasing air-conditioning system, which is applied to the enthalpy-increasing air-conditioning system of the above embodiment.

[0070] like Figure 5 As shown, in the indoor heating mode, the enthalpy-added air conditioning system is controlled to enter the standby state and perform the following steps:

[0071] Indoor temperature control steps:

[0072] S10, setting the indoor preset temperature T10.

[0073] S12, real-time detection of the actual indoor temperature T11, and determination of whether T10>T11 is established. If so, start the compressor 10, the first throttle valve 24 and the second throttle valve 231, close the first bypass line 28 and the second bypass line 29, and control the refrigerant to flow through the indoor heat exchanger 21 and the first channel 232 in sequence, and then flow to the outdoor heat exchanger 27 and the second channel 233 respectively; if not, close the first throttle valve 24.

[0074] S13, repeat step S12 until the enthalpy-increasing air-conditioning system exits the heating mode.

[0075] The above steps are that when the enthalpy-added air conditioning system enters the heating mode, it first enters the standby state. In the standby state, the indoor preset temperature T10 is set, and the indoor actual temperature T11 is detected in real time. When it is found that the indoor preset temperature T10 is higher than the indoor actual temperature T11, the indoor environment is heated, the compressor 10, the first throttle valve 24, the second throttle valve 231, the first check valve 25, the fourth check valve 22, the indoor fan 211 and the outdoor fan are turned on, and the second check valve 291 and the third check valve 281 are closed. The refrigerant flow direction in the heating mode has been described in the above embodiment and will not be repeated here. When the indoor preset temperature T10 is not higher than the indoor actual temperature T11, at this time, there is no need to heat the indoor environment, so the first throttle valve 24 can be closed. In order to avoid affecting the control of the heat dissipation of the battery assembly, the compressor 10 does not need to be closed. When the enthalpy-added air conditioning system is always in the heating mode, step S12 is continuously repeated until the enthalpy-added air conditioning system exits the heating mode, and step S12 is then stopped.

[0076] Battery component heat dissipation control steps:

[0077] S30 , setting a preset outlet water temperature T33 of the heat exchange plate 34 .

[0078] S31, real-time detection of the actual outlet water temperature T32 of the heat exchange plate 34 is performed to determine whether T32>T33 is established. If so, the compressor 10, the second throttle valve 231, the third throttle valve 32 and the circulation pump 33 are turned on, and the first bypass pipeline 28 and the second bypass pipeline 29 are closed; the control valve assembly controls the refrigerant to flow through the indoor heat exchanger 21 and the first channel 232 in sequence, and then flow to the battery heat dissipation heat exchanger 31 and the second channel 233 respectively; if not, the third throttle valve 32 and the circulation pump 33 are closed.

[0079] S32, repeat step S31 until the enthalpy-increasing air-conditioning system exits the heating mode.

[0080] The above steps are as follows: when the heat pump air-conditioning system enters the heating mode, it first enters the standby state. In the standby state, the preset outlet water temperature T33 of the heat exchange plate 34 is set, and the actual outlet water temperature T32 of the heat exchange plate 34 is detected in real time. When it is found that the actual outlet water temperature T32 of the heat exchange plate 34 is higher than the preset outlet water temperature T33 of the heat exchange plate 34, it means that the temperature of the battery module is too high at this time and it needs to be cooled down. At this time, the compressor 10 (if the compressor 10 is already turned on, keep the compressor 10 in the on state), the second throttle valve 231, the third throttle valve 32, the fourth check valve 22, the indoor fan 211 and the circulation pump 33 are turned on. At the same time, the second check valve 291 and the third check valve 281 are closed. As Figure 3 shown, at this time, if the indoor temperature is rising, after the refrigerant flows out of the first channel 232, it is divided into three paths and flows back to the compressor 10; if the indoor temperature is not rising and only the battery module is cooled, after the refrigerant flows out of the first channel 232, it can be divided into two paths (the second branch and the third branch) and flow back to the compressor 10. When the actual outlet water temperature T32 of the heat exchange plate 34 is not higher than the preset outlet water temperature T33 of the heat exchange plate 34, it means that the temperature of the battery module can meet its working range at this time and there is no need to cool down the battery module. Therefore, the third throttle valve 32 and the circulation pump 33 can be closed. Similarly, the compressor 10 does not need to be turned off. At this time, if the indoor temperature is rising, after the refrigerant flows out of the first channel 232, it can be divided into two paths (the first branch and the second branch) and flow back to the compressor 10.

[0081] The above indoor temperature rising control steps and battery module heat dissipation control steps can be executed simultaneously and work separately, or can be executed separately and work separately. The two control systems can be independent of each other and do not interfere with each other.

[0082] As Figure 6 shown, in the indoor cooling mode, the heat pump air-conditioning system is controlled to enter the standby state and the following steps are executed:

[0083] Indoor temperature lowering control steps:

[0084] S20. Set the indoor preset temperature T20.

[0085] S22. Turn on the ventilation mode of the indoor fan 211, detect the actual indoor temperature T21 in real time, and judge whether T20 < T21 holds. If so, start the compressor 10, the first throttle valve 24 and the second throttle valve 231, turn on the first bypass pipeline 28 and the second bypass pipeline 29, and the control valve assembly controls the refrigerant to flow through the outdoor heat exchanger 27, the first bypass pipeline 28, and the first channel 232 in sequence, and then flow to the second bypass pipeline 29 and the second channel 233 respectively; if not, close the first throttle valve 24.

[0086] S23, repeat step S22 until the enthalpy-increasing air-conditioning system exits the cooling mode.

[0087] The above steps are that when the enthalpy-added air conditioning system enters the cooling mode, the compressor 10 is first controlled to enter the standby state. In the standby state, the ventilation mode of the indoor fan 211 is turned on, the indoor preset temperature T20 is set, and the actual temperature T21 is detected in real time. When it is found that the indoor preset temperature T20 is lower than the actual indoor temperature T21, the indoor environment is cooled down, the compressor 10, the first throttle valve 24, the second throttle valve 231, the second one-way valve 291, the third one-way valve 281, the indoor fan 211 and the outdoor fan are turned on, and the first one-way valve 25 and the fourth one-way valve 22 are closed. For the refrigerant flow direction, please refer to the principle description in the above embodiment. When the indoor preset temperature T20 is not lower than the actual indoor temperature T21, at this time, there is no need to cool down the indoor environment, so the first throttle valve 24 can be closed. In order to avoid affecting the control of the heat dissipation of the battery assembly, the compressor 10 does not need to be closed. When the enthalpy-added air conditioning system is always in the cooling mode, step S22 is continuously repeated until the enthalpy-added air conditioning system exits the cooling mode, and step S22 is then stopped.

[0088] Battery component heat dissipation control steps:

[0089] S40, setting a preset outlet water temperature T43 of the heat exchange plate 34.

[0090] S41, real-time detection of the actual outlet water temperature T42 of the heat exchange plate 34 is performed to determine whether T42>T43 is established. If so, the compressor 10, the second throttle valve 231, the third throttle valve 32, the circulating pump 33 and the first bypass pipeline 28 are turned on; the control valve assembly controls the refrigerant to flow through the outdoor heat exchanger 27, the first bypass pipeline 28 and the first channel 232 in sequence, and then flows to the second channel 233 and the third throttle valve 32 respectively; if not, the third throttle valve 32 and the circulating pump 33 are closed.

[0091] S42, repeating step S41 until the enthalpy-increasing air-conditioning system exits the cooling mode.

[0092] This step means that when the enthalpy-added air conditioning system enters the cooling mode, it first enters the standby state. In the standby state, the preset water outlet temperature T43 of the heat exchange plate 34 is set, and the actual water outlet temperature T42 of the heat exchange plate 34 is detected in real time. When it is found that the actual water outlet temperature T42 of the heat exchange plate 34 is higher than the preset water outlet temperature T43 of the heat exchange plate 34, it means that the temperature of the battery assembly is too high and needs to be cooled. At this time, the compressor 10 is turned on (if the compressor 10 is already turned on, keep the compressor 10 turned on), the second throttle valve 231, the third throttle valve 32, the third one-way valve 281, the indoor fan 211 and the circulating pump 33. At the same time, the first one-way valve 25 and the fourth one-way valve 22 are closed. Figure 4 As shown, at this time, if the indoor temperature is in a cooling state, the refrigerant flows out of the first channel 232 and flows back to the compressor 10 in three ways; if the indoor temperature is not in a cooling state, and only the battery assembly is cooled, the refrigerant flows out of the first channel 232 and can flow back to the compressor 10 in two ways (the second branch and the third branch). When the actual outlet water temperature T32 of the heat exchange plate 34 is not higher than the preset outlet water temperature T33 of the heat exchange plate 34, it means that the temperature of the battery assembly can meet its working range at this time, and the battery assembly does not need to be cooled. Therefore, the third throttle valve 32 and the circulating pump 33 can be closed, and similarly, the compressor 10 does not need to be closed. At this time, if the indoor temperature is in a cooling state, the refrigerant flows out of the first channel 232 and can flow back to the compressor 10 in two ways (the first branch and the second branch).

[0093] If the indoor environment has neither cooling nor heating requirements, the heat dissipation control of the battery components can still be achieved. At this time, the following steps can be performed:

[0094] S50 , setting a preset outlet water temperature T33 of the heat exchange plate 34 .

[0095] S51, real-time detection of the actual outlet water temperature T52 of the heat exchange plate 34 is performed to determine whether T52>T53 is established. If so, the compressor 10, the second throttle valve 231, the third throttle valve 32 and the circulating pump 33 are turned on, and the first bypass pipeline 28 and the second bypass pipeline 29 are closed; the control valve assembly controls the refrigerant to flow through the indoor heat exchanger 21 and the first channel 232 in sequence, and then flow to the battery heat dissipation heat exchanger 31 and the second channel 233 respectively; if not, the third throttle valve 32 and the circulating pump 33 are closed.

[0096] S52. Repeat step S51 until the battery assembly stops working.

[0097] It can be seen from the above control steps that no matter whether the enthalpy-increasing air-conditioning system is in the indoor heating mode or the indoor cooling mode, the enthalpy-increasing function of the compressor can be realized, which can effectively improve the performance of the compressor and reduce energy consumption. At the same time, the indoor temperature control and the heat dissipation control of the battery components do not interfere with each other and can work independently of each other. The two systems are integrated together to reduce the volume and weight of the entire system. The two systems are organically combined. When the battery components are cooled, their heat can be recovered to increase the inlet temperature of the compressor, thereby improving the energy efficiency ratio of the compressor. Whether it is the indoor heating mode or the indoor cooling mode, the heat dissipation of the battery components can be achieved, and the remaining heat can be recycled.

[0098] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0099] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An enthalpy-increasing air conditioning system, characterized in that: include: A compressor, a reversing valve, an indoor heat exchanger, an economizer, an outdoor heat exchanger, a first throttle valve, a second throttle valve, a first bypass pipeline, a control valve assembly and a second bypass pipeline; and also includes a battery thermal management system, the battery thermal management system including a battery heat dissipation heat exchanger and a third throttle valve; Wherein: the economizer comprises a first channel and a second channel which can exchange heat with each other, the indoor heat exchanger, the first channel, the first throttle valve and the outdoor heat exchanger are connected in series in sequence, the inlet of the second throttle valve is connected between the first channel and the first throttle valve, the outlet of the second throttle valve is connected to the inlet of the second channel, and the outlet of the second channel is connected to the enthalpy increase port of the compressor; one end of the first bypass pipeline and the second bypass pipeline are respectively connected between the outdoor heat exchanger and the first throttle valve, and the other end is respectively connected between the indoor heat exchanger and the first channel; The inlet of the third throttle valve is connected between the first channel and the first throttle valve, the outlet of the third throttle valve is connected to the inlet of the battery heat dissipation heat exchanger, the outlet of the battery heat dissipation heat exchanger is connected to the air intake of the compressor, and the battery heat dissipation heat exchanger is used to perform heat exchange with the battery assembly; In the indoor heating mode, the exhaust port of the compressor is connected to the indoor heat exchanger through the reversing valve, and the outdoor heat exchanger is connected to the air intake port through the reversing valve, and the control valve assembly is used to close the first bypass pipeline and the second bypass pipeline, and can control the refrigerant to flow through the indoor heat exchanger, the first channel and the outdoor heat exchanger in sequence; In the indoor cooling mode, the exhaust port is connected to the outdoor heat exchanger through the reversing valve, and the indoor heat exchanger is connected to the intake port through the reversing valve. The control valve assembly is used to open the first bypass line and the second bypass line, and can control the refrigerant to flow through the outdoor heat exchanger, the first bypass line, the first channel, the second bypass line and the indoor heat exchanger in sequence.

2. The enthalpy-increasing air conditioning system according to claim 1, characterized in that: It also includes a gas-liquid separator and a drying filter; the reversing valve includes a first interface, a second interface, a third interface and a fourth interface; the economizer includes a first channel and a second channel; The outlet of the gas-liquid separator is connected to the air intake port, the exhaust port is connected to the first interface, the inlet of the gas-liquid separator is respectively connected to the fourth interface and the outlet of the battery heat dissipation heat exchanger, the indoor heat exchanger, the first channel, the first throttle valve, the drying filter and the outdoor heat exchanger are connected in series in sequence, one port of the outdoor heat exchanger is connected to the second interface, and one port of the indoor heat exchanger is connected to the third interface to form a circulation loop.

3. The enthalpy-increasing air conditioning system according to claim 2, characterized in that: The two ends of the first bypass pipeline are respectively connected to the first connection point and the second connection point of the main pipeline, and the two ends of the second bypass pipeline are respectively connected to the third connection point and the fourth connection point of the main pipeline; the first connection point and the third connection point are respectively located between the outdoor heat exchanger and the first throttle valve, and the first connection point is arranged close to the outdoor heat exchanger; the second connection point and the fourth connection point are respectively located between the indoor heat exchanger and the first channel, and the second connection point is arranged close to the economizer.

4. The enthalpy-increasing air conditioning system according to claim 3, characterized in that: The control valve assembly includes a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve, the first one-way valve is arranged on the main pipe between the first connection point and the third connection point, the second one-way valve is arranged on the second bypass pipe, the third one-way valve is arranged on the first bypass pipe, and the fourth one-way valve is arranged on the main pipe between the second connection point and the fourth connection point.

5. The enthalpy-increasing air conditioning system according to claim 3, characterized in that: The battery heat dissipation heat exchanger includes a first flow channel and a second flow channel that can exchange heat with each other; the inlet of the first flow channel is connected to the outlet of the third throttle valve, and the outlet of the first flow channel is connected to the inlet of the gas-liquid separator; the second flow channel is used to circulate a coolant, and the coolant is used to exchange heat with the battery assembly.

6. The enthalpy-increasing air conditioning system according to claim 5, characterized in that: The battery thermal management system further includes a circulation pump and a heat exchange plate in circulation communication with the second flow channel, wherein the heat exchange plate is used for exchanging heat with the battery assembly.

7. The enthalpy-increasing air conditioning system according to claim 6, characterized in that: It also includes a water temperature detection device and a room temperature detection device. The water temperature detection device is used to detect the temperature of the coolant flowing out of the heat exchange plate, and the room temperature detection device is used to detect the temperature of the indoor environment where the indoor heat exchanger is located.

8. An electric vehicle, characterized in that: It comprises the enthalpy-added air conditioning system as described in any one of claims 1 to 7.

9. A control method for an enthalpy-increasing air conditioning system, characterized in that: Applicable to the enthalpy-increasing air conditioning system according to any one of claims 1 to 7, The control method of the enthalpy-increasing air conditioning system controls the enthalpy-increasing air conditioning system to enter a standby state in an indoor heating mode, and performs the following steps: S10, setting the indoor preset temperature T10; S12, real-time detection of the actual indoor temperature T11, and determination of whether T10>T11 is established, if so, starting the compressor, the first throttle valve and the second throttle valve, closing the first bypass pipeline and the second bypass pipeline, and the control valve assembly controls the refrigerant to flow through the indoor heat exchanger and the first channel in sequence, and then flow to the outdoor heat exchanger and the second channel respectively; if not, closing the first throttle valve; S13, repeating step S12 until the enthalpy-increasing air-conditioning system exits the heating mode; The control method of the enthalpy-increasing air conditioning system controls the enthalpy-increasing air conditioning system to enter a standby state in an indoor cooling mode, and performs the following steps: S20, setting the indoor preset temperature T20; S22. Turn on the indoor fan ventilation mode, detect the actual indoor temperature T21 in real time, and determine whether T20 < T21 holds. If so, start the compressor, the first throttle valve, and the second throttle valve, open the first bypass pipeline and the second bypass pipeline, and the control valve assembly controls the refrigerant to flow through the outdoor heat exchanger, the first bypass pipeline, and the first channel in sequence, and then flow to the second bypass pipeline and the second channel respectively; if not, close the first throttle valve. S23. Repeat step S22 until the enhanced enthalpy air conditioning system exits the refrigeration mode.

10. The control method of the enthalpy-increasing air conditioning system according to claim 9, characterized in that: The enhanced enthalpy air conditioning system further includes a battery thermal management system, and the battery thermal management system includes a battery heat dissipation heat exchanger and a third throttle valve connected in series; the battery heat dissipation heat exchanger includes a first flow channel and a second flow channel that can exchange heat with each other; the outlet of the first flow channel is connected to the suction port of the compressor, and the inlet of the third throttle valve is connected to the outlet of the first channel; the battery thermal management system further includes a circulation pump and a heat exchange plate that are circularly communicated with the second flow channel, and the heat exchange plate is used for exchanging heat with the battery assembly. In the indoor heating mode, the control method of the enhanced enthalpy air conditioning system further includes the following steps: S30. Set the preset outlet water temperature T33 of the heat exchange plate. S31. Detect the actual outlet water temperature T32 of the heat exchange plate in real time, and determine whether T32 > T33 holds. If so, turn on the compressor, the second throttle valve, the third throttle valve, and the circulation pump, and close the first bypass pipeline and the second bypass pipeline; the control valve assembly controls the refrigerant to flow through the indoor heat exchanger and the first channel in sequence, and then flow to the battery heat dissipation heat exchanger and the second channel respectively; if not, close the third throttle valve and the circulation pump. S32. Repeat step S31 until the battery assembly stops working. In the indoor cooling mode, the control method of the enhanced enthalpy air conditioning system further includes the following steps: S40. Set the preset outlet water temperature T43 of the heat exchange plate. S41. Detect the actual outlet water temperature T42 of the heat exchange plate in real time, and determine whether T42 > T43 holds. If so, turn on the compressor, the second throttle valve, the third throttle valve, the circulation pump, and the first bypass pipeline; the control valve assembly controls the refrigerant to flow through the outdoor heat exchanger, the first bypass pipeline, and the first channel in sequence, and then flow to the second channel and the third throttle valve respectively; if not, close the third throttle valve and the circulation pump. S42. Repeat step S41 until the battery assembly stops working.

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