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

Abstract

The application provides an enthalpy-increasing air conditioning system, an electric vehicle and a control method of the enthalpy-increasing air conditioning system. The enthalpy-increasing air conditioning system is additionally provided with a first bypass pipeline, a second bypass pipeline and a control valve assembly, so that no matter in an indoor heating mode or in an indoor cooling mode, refrigerant can enter the same inlet of an economizer, thereby making the refrigerant flowing out of the economizer channel realize the enthalpy-increasing function of the compressor in any case. 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 an outdoor heat exchanger through a first throttling valve, the second path flows to a second channel of the economizer through a second throttling valve, and the third path flows to a battery heat dissipation heat exchanger through a third throttling valve. The third path refrigerant flows back to the compressor after absorbing the heat of a battery assembly in the battery heat dissipation heat exchanger, thereby enabling the battery cooling to be started when the indoor is heated, recovering the heat of the battery and helping to reduce energy loss.

Description

TECHNICAL FIELD

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

[0002] The air conditioning system of the existing electric vehicle is usually realized by a compressor, an outdoor heat exchanger, an economizer, a throttling valve, an indoor heat exchanger and the like when heating at low temperature. The economizer and the corresponding throttling valve are arranged to increase the enthalpy of the compressor, broaden the operation range of the heat pump system and improve the heating effect. The battery thermal management system of the whole vehicle is also an independent system or integrated into the air conditioning system, and a heat exchanger in parallel with the indoor heat exchanger is arranged to cool the battery coolant. In the process of implementing the present application, the inventors found that at least the following problems exist in the prior art: At present, the existing enthalpy-increasing air conditioning system can only increase the enthalpy by using the economizer when heating indoors, and the enthalpy-increasing function cannot be realized when cooling indoors, and the compressor has a low energy efficiency ratio. In addition, the battery cooling cannot be started when heating indoors, and the battery heat cannot be recycled. SUMMARY

[0003] Therefore, the present application provides an enthalpy-increasing air conditioning system, an electric vehicle and a control method of the enthalpy-increasing air conditioning system to solve the problems that the compressor cannot increase the enthalpy when cooling indoors and the battery cooling cannot be started when heating indoors in the prior art, improve the energy efficiency ratio of the compressor and reduce energy consumption.

[0004] To achieve the above-mentioned purpose, the technical scheme of the embodiments of the present application is as follows:

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

[0006] The economizer comprises a first channel and a second channel capable of heat exchange with each other, the indoor heat exchanger, the first channel, the first throttling valve and the outdoor heat exchanger are sequentially connected in series, the inlet of the second throttling valve is connected between the first channel and the first throttling valve, the outlet of the second throttling valve is connected to the inlet of the second channel, and the outlet of the second channel is connected to the enthalpy-increasing port of the compressor; one end of the first bypass pipeline and the second bypass pipeline is respectively connected between the outdoor heat exchanger and the first throttling 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, and the outlet of the battery heat dissipation heat exchanger is connected to the suction port of the compressor, and the battery heat dissipation heat exchanger is used for heat exchange with the battery assembly.

[0008] In the indoor heating mode, the exhaust port of the compressor is communicated with the indoor heat exchanger through the reversing valve, and the outdoor heat exchanger is communicated with the suction port through the reversing valve, and the control valve assembly is used for closing 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 turn.

[0009] In the indoor heating mode, the exhaust port of the compressor is communicated with the indoor heat exchanger through the reversing valve, and the outdoor heat exchanger is communicated with the suction port through the reversing valve, and the control valve assembly is used for closing 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 turn.

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

[0011] The outlet of the gas-liquid separator is connected with the suction port, the exhaust port is connected with the first interface, the inlet of the gas-liquid separator is connected with 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, one port of the outdoor heat exchanger is connected with the second interface, and one port of the indoor heat exchanger is connected with the third interface, forming a circulating loop.

[0012] In one of the embodiments, two ends of the first bypass pipeline are respectively connected to a first connection point and a second connection point of a main pipeline, and two ends of the second bypass pipeline are respectively connected to a third connection point and a 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 of the embodiments, the control valve assembly comprises 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 pipeline between the first connection point and the third connection point, the second one-way valve is arranged on the second bypass pipeline, the third one-way valve is arranged on the first bypass pipeline, and the fourth one-way valve is arranged on the main pipeline between the second connection point and the fourth connection point.

[0014] In one of the embodiments, the battery heat dissipation heat exchanger comprises a first flow channel and a second flow channel which can exchange heat with each other; the inlet of the first flow channel is connected with the outlet of the third throttling valve, and the outlet of the first flow channel is connected with the inlet of the gas-liquid separator; the second flow channel is used for circulating a cold carrier which is used for heat exchange with the battery assembly.

[0015] In one of the embodiments, the battery heat management system further comprises a circulating pump and a heat exchange plate which are in circulation communication with the second flow channel, and the heat exchange plate is used for heat exchange with the battery assembly.

[0016] In one of the embodiments, the enthalpy-increasing air conditioning system further comprises a water temperature detection device and a room temperature detection device, the water temperature detection device is used for detecting the temperature of the cold carrier flowing out of the heat exchange plate, and the room temperature detection device is used for detecting the temperature of the indoor environment in which the indoor heat exchanger is located.

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

[0018] In a third aspect, the embodiments of the present application provide a control method of 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 an indoor preset temperature T10;

[0021] S12, detecting an actual indoor temperature T11 in real time, and determining whether T10>T11 is established, if yes, starting the compressor, the first throttling valve and the second throttling valve, closing the first bypass pipeline and the second bypass pipeline, and the control valve assembly controlling 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 throttling valve;

[0022] S13, repeatedly performing 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 a standby state in an indoor cooling mode, and performs the following steps:

[0024] S20, set an indoor preset temperature T20;

[0025] S22, start an indoor fan ventilation mode, detect an indoor actual temperature T21 in real time, and determine whether T20 < T21 is established, if yes, start the compressor, the first throttling valve and the second throttling 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 throttling valve;

[0026] S23, repeatedly perform step S22 until the enthalpy increasing air conditioning system exits the cooling mode.

[0027] In one embodiment, the enthalpy increasing air conditioning system further comprises a battery thermal management system, the battery thermal management system comprises a battery heat dissipation heat exchanger and a third throttling valve connected in series; the battery heat dissipation heat exchanger comprises a first flow channel and a second flow channel which 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 throttling valve and the outlet of the first channel are connected; the battery thermal management system further comprises a circulating pump and a heat exchange plate in circulation communication with the second flow channel, and the heat exchange plate is used for heat exchange with the battery assembly;

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

[0029] S30, set a preset outlet water temperature T33 of the heat exchange plate;

[0030] S31, detect an actual outlet water temperature T32 of the heat exchange plate in real time, and determine whether T32 > T33 is established,

[0031] if yes, start the compressor, the second throttling valve, the third throttling valve and the circulating 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 throttling valve and the circulating pump;

[0032] S32, repeatedly perform step S31 until the battery assembly stops working;

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

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

[0035] S41, the actual outlet water temperature T42 of the heat exchange plate is detected in real time, whether T42>T43 is established is judged, if yes, the compressor, the second throttling valve, the third throttling valve, the circulating pump and the first bypass pipeline are started; the control valve assembly controls the refrigerant to flow through the outdoor heat exchanger, the first bypass pipeline and the first channel in turn, and then flows to the second channel and the third throttling valve respectively; if not, the third throttling valve and the circulating pump are closed;

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

[0037] The application has at least the following beneficial effects: the enthalpy-increasing air conditioning system provided by the 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 can enter the same inlet of the economizer in the indoor heating mode or the indoor cooling mode, so that the refrigerant flowing out of the channel of the economizer can realize the enthalpy-increasing function of the compressor in any case; 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 throttling valve, the second path flows to the second channel of the economizer through the second throttling valve, and the third path flows to the battery heat dissipation heat exchanger through the third throttling valve; 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 the battery cooling can be started when the indoor heating is started, and the heat of the battery is recovered, which helps to reduce the energy consumption. The enthalpy-increasing air conditioning system provided by the application can realize the dual-mode enthalpy-increasing function of refrigeration and heating by modifying the existing air conditioner, the modification range is small, the equipment investment cost is low, the energy efficiency ratio of the compressor can be effectively improved during refrigeration, and the energy consumption is reduced. The control method of the electric vehicle and the enthalpy-increasing air conditioning system provided by the application includes the above-mentioned enthalpy-increasing air conditioning system, and therefore also has the above-mentioned beneficial effects. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is a structure schematic view of the enthalpy-increasing air conditioning system of an embodiment of the application.

[0039] Figure 2 It is a structure schematic view of the enthalpy-increasing air conditioning system of another embodiment of the application.

[0040] Figure 3 It is a structure schematic view of the enthalpy-increasing air conditioning system of another embodiment of the application. Figure 1 It is a refrigerant and coolant flow direction schematic view of the enthalpy-increasing air conditioning system in the indoor heating mode.

[0041] Figure 4 It is a refrigerant and coolant flow direction schematic view of the enthalpy-increasing air conditioning system in the indoor heating mode. Figure 1The refrigerant and the coolant flow direction schematic diagram of the enthalpy increasing air conditioning system in the indoor cooling mode.

[0042] Figure 5 The control method flow chart of the enthalpy increasing air conditioning system in the indoor heating mode. Figure 1 The control method flow chart of the enthalpy increasing air conditioning system in the indoor cooling mode.

[0043] Figure 6 The control method flow chart of the enthalpy increasing air conditioning system in the indoor heating mode. Figure 1 The control method flow chart of the enthalpy increasing air conditioning system in the indoor cooling mode.

[0044] The meanings of the respective reference numerals in the 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 check valve; 23, economizer; 231, second throttling valve; 232, first passage; 233, second passage; 24, first throttling valve; 25, first check valve; 26, drying filter; 27, outdoor heat exchanger; 28, first bypass pipeline; 281, third check valve; 282, first connection point; 283, second connection point; 29, second bypass pipeline; 291, second check 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 throttling valve; 33, circulating pump; 34, heat exchange plate; 35, expansion tank. DETAILED DESCRIPTION

[0048] The technical scheme of the present application is further described in detail below in combination with the drawings and specific embodiments of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in this description, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0050] In the description of the application, it is to be understood by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In the description of the application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0051] In the description of the application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0052] Please refer to Figure 1 and Figure 2 The enthalpy-increasing air conditioning system of the embodiment of the application comprises a compressor 10, a reversing valve, an indoor heat exchanger 21, an economizer 23, an outdoor heat exchanger 27, a first throttling valve 24, and a second throttling valve 231. The economizer 23 is arranged between the indoor heat exchanger 21 and the outdoor heat exchanger 27, and one passage of the economizer 23 is in communication with an enthalpy-increasing port of the compressor 10. More specifically, the economizer 23 comprises a first passage 232 and a second passage 233 that can exchange heat with each other. The indoor heat exchanger 21, the first passage 232, the first throttling valve 24, and the outdoor heat exchanger 27 are connected in series. An inlet of the second throttling valve 231 is connected between the first passage 232 and the first throttling valve 24. An outlet of the second throttling valve 231 is connected to an inlet of the second passage 233. An outlet of the second passage 233 is connected to the enthalpy-increasing port of the compressor 10. The enthalpy-increasing air conditioning system further comprises a first bypass pipeline 28, a control valve assembly, and a second bypass pipeline 29. One end of the first bypass pipeline 28 and one end of the second bypass pipeline 29 are connected between the outdoor heat exchanger 27 and the first throttling valve 24, respectively. The other end of the first bypass pipeline 28 and the other end of the second bypass pipeline 29 are connected between the indoor heat exchanger 21 and the first passage 232 of the economizer 23, respectively.

[0053] The enthalpy-increasing air conditioning system further comprises a battery thermal management system 30, which comprises a battery heat dissipation heat exchanger 31 and a third throttling valve 32. The third throttling valve 32 is connected between the first channel 232 and the first throttling valve 24 at the inlet, and the outlet of the third throttling valve 32 is connected to the inlet of the battery heat dissipation heat exchanger 31. The outlet of the battery heat dissipation heat exchanger 31 is connected to the suction port of the compressor 10 (also referred to as the inlet of the compressor 10). The battery heat dissipation heat exchanger 31 is used for heat exchange with the battery assembly to meet the heat dissipation requirement of the battery assembly.

[0054] In the indoor heating mode, the discharge port of the compressor 10 (also referred to as the outlet of the compressor 10) is connected to the indoor heat exchanger 21 through the reversing valve, and the suction port of the compressor 10 is connected to the outdoor heat exchanger 27 through the reversing valve to realize the heating cycle. The control valve assembly is used to close the first bypass pipeline 28 and the second bypass pipeline 29, and 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 heating mode, the discharge port of the compressor 10 (also referred to as the outlet of the compressor 10) is connected to the indoor heat exchanger 21 through the reversing valve, and the suction port of the compressor 10 is connected to the outdoor heat exchanger 27 through the reversing valve to realize the heating cycle. The control valve assembly is used to close the first bypass pipeline 28 and the second bypass pipeline 29, and 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.

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

[0057] The indoor temperature control system 20 of the embodiment can include an indoor heat exchanger 21, an economizer 23, a first throttling valve 24, a second throttling valve 231, a drying filter 26, and an outdoor heat exchanger 27. In the embodiment, the indoor heat exchanger 21 and the outdoor heat exchanger 27 can each be a coil heat exchanger, and an indoor fan 211 is arranged at the indoor heat exchanger 21, and an outdoor fan is arranged at the outdoor heat exchanger 27. It can be understood that a fan can be arranged at the air inlet side or the air outlet side of the indoor heat exchanger 21 and the outdoor heat exchanger 27, respectively, to improve the heat exchange effect of the heat exchanger through forced convection. The economizer 23 of the embodiment can be a plate heat exchanger, including a first passage 232 and a second passage 233 that can exchange heat with each other. The indoor heat exchanger 21, the first passage 232, the first throttling valve 24, the drying filter 26, and the outdoor heat exchanger 27 can be sequentially connected in series on the main pipeline 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 drying filter 26 is connected to the second interface 112. The second throttling valve 231 and the second passage 233 of the economizer 23 are connected in series, the inlet of the second throttling valve 231 is connected to the main pipeline between the first passage 232 and the first throttling valve 24, and the outlet of the second passage 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 in communication with the third interface 113, and the second interface 112 of the reversing valve is in communication with the fourth interface 114. In the indoor cooling mode, the first interface 111 of the reversing valve is in communication with the second interface 112, and the third interface 113 of the reversing valve is in communication with the fourth interface 114.

[0058] The first bypass pipeline 28 has two ends connected to the first connection point 282 and the second connection point 283 of the main pipeline, and the second bypass pipeline 29 has two ends 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 located between the outdoor heat exchanger 27 and the first throttling valve 24, respectively, 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 located between the indoor heat exchanger 21 and the first passage 232, respectively, 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 in communication with each other.

[0059] The control valve assembly in 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 located on the main pipeline between the first connection point 282 and the third connection point 292; the second check valve 291 is located on the second bypass pipeline 29; the third check valve 281 is located on the first bypass pipeline 28; and the fourth check valve 22 is located on the main pipeline 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 dryer 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 dryer 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 is understood that in some other embodiments, solenoid valves can be used instead of check valves to achieve the same solution.

[0060] like Figure 3 As shown, the working principle of the enthalpy-increasing air conditioning system in indoor heating mode is as follows: First, the first port 111 and the third port 113 of the four-way reversing valve 11 are opened, and the second port 112 and the fourth port 114 are opened. The low-temperature, low-pressure gaseous refrigerant is compressed into high-temperature, high-pressure vapor (gaseous refrigerant) by the compressor 10. After passing through the first port 111 and the third port 113 of the four-way reversing valve 11, it enters the indoor heat exchanger 21. Through the forced convection of the indoor fan 211, it exchanges heat with the indoor air, and the indoor air temperature rises. After the refrigerant releases heat, it condenses into a medium-temperature, high-pressure liquid refrigerant. After passing through the fourth one-way valve 22, it enters the first port of the economizer 23. The refrigerant after channel 232 and the refrigerant after the second throttle valve 231 (the refrigerant in the second channel 233) is further cooled (subcooled) by heat exchange. At this time, the refrigerant can be divided into two paths. The refrigerant in the first path is throttled by the first throttle valve 24 into a low-temperature and low-pressure liquid refrigerant (or a gas-liquid mixture). After passing through the first one-way valve 25 and the dryer filter 26, it enters the outdoor heat exchanger 27. The refrigerant in the outdoor heat exchanger 27 exchanges heat with the outdoor air through the forced convection of the outdoor fan. After absorbing heat and evaporating, it forms a low-temperature and low-pressure gaseous refrigerant. After passing through the second interface 112 and the fourth interface 114, the low-temperature and low-pressure gaseous refrigerant 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, low-pressure liquid refrigerant (or a gas-liquid mixture), and enters the second channel 233 of the economizer 23. After absorbing the heat of the refrigerant in the first channel 232 and evaporating into a low-temperature, low-pressure gaseous refrigerant, it directly enters the enthalpy-increasing port of the compressor 10 to complete one 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, 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, enters the outdoor heat exchanger 27 through the first interface 111 and the second interface 112 of the four-way reversing valve 11, exchanges heat with the outdoor air through the forced convection of the outdoor fan, and the refrigerant releases heat and condenses into medium-temperature and high-pressure liquid refrigerant. After passing through the drying filter 26, the refrigerant enters the first bypass pipeline 28, passes through the third one-way valve 281, exchanges heat with the refrigerant (the refrigerant in the second passage 233) after the first passage 232 and the second throttling valve 231 of the economizer 23 to obtain further cooling (supercooling). At this time, the refrigerant can be divided into two paths. The refrigerant in the first branch path is throttled into low-temperature and low-pressure liquid refrigerant by the first throttling valve 24, 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 the forced convection of the indoor fan 211. The indoor air is cooled, and the refrigerant absorbs heat and evaporates to form 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 returns to the compressor 10 through the gas-liquid separator 12. The refrigerant in the second branch path is throttled into low-temperature and low-pressure liquid refrigerant by the second throttling valve 231, enters the second passage 233 of the economizer 23, absorbs the heat of the refrigerant in the first passage 232, evaporates into low-temperature and low-pressure gaseous refrigerant, and directly enters the enthalpy increasing port of the compressor 10 to complete a refrigeration cycle.

[0062] As can be seen from the above, the enthalpy increasing air conditioning system of the embodiment of the present application can realize the enthalpy increasing function of the compressor 10 in the indoor heating mode and the indoor cooling mode, can improve the performance of the compressor 10 in the heating mode and the cooling mode, is conducive to reducing energy consumption; in addition, in the indoor heating mode, the refrigerant flowing out of the first passage 232 of the economizer 23 can be divided into three paths: the first path flows to the outdoor heat exchanger 21 through the first throttling valve 24, the second path flows to the second passage 233 of the economizer 23 through the second throttling valve 231, and the third path flows to the battery heat dissipation heat exchanger 31 through the third throttling valve 32. The third path refrigerant absorbs the heat of the battery assembly in the battery heat dissipation heat exchanger 31 and flows back to the compressor 10, so that the battery cooling can be turned on in the indoor heating, the battery heat is recovered, and the energy consumption is reduced. The enthalpy increasing air conditioning system of the embodiment of the present application can be improved on the basis of the original ordinary enthalpy increasing air conditioning system (which cannot realize the enthalpy increasing function in refrigeration), only the first bypass pipeline 28, the second bypass pipeline 29 and the control valve assembly need to be added, the number of equipment components is small, and the investment cost is low.

[0063] As Figure 1As shown, the enthalpy-increasing air conditioning system of the embodiment of the present application can also be coupled with a battery thermal management system 30. The battery thermal management system 30 of the embodiment includes a battery heat dissipation heat exchanger 31 and a third throttling valve 32. The battery heat dissipation heat exchanger 31 can be 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 with the outlet of the third throttling valve 32, the outlet of the first flow channel 311 is connected with the inlet of the gas-liquid separator 12, and the inlet of the third throttling valve 32 can be connected with the outlet of the first channel 232; the second flow channel 312 is used to flow the carrier refrigerant, which is used to exchange heat with the battery assembly.

[0064] Specifically, in the 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 flow the carrier refrigerant to exchange heat with the battery assembly, so as to reduce the temperature of the battery assembly. The inlet of the circulating pump 33 is connected with 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 with the inlet of the second flow channel 312 of the battery heat dissipation heat exchanger 31.

[0065] The battery thermal management system 30 of the embodiment further includes an expansion tank 35 connected with the heat exchange plate 34 and the circulating pump 33. The inlet of the expansion tank 35 is connected with the pipeline between the second flow channel 312 and the heat exchange plate 34, and the outlet of the expansion tank 35 is connected with the pipeline between the second flow channel 312 and the circulating pump 33. The expansion tank 35 is connected with the heat exchange plate 34 and the circulating pump 33, which can supplement the carrier refrigerant system before the water outlet of the circulating pump 33, and also can play a role of exhaust after the liquid outlet of the heat exchange plate 34.

[0066] The enthalpy-increasing air conditioning system of this embodiment can achieve heat dissipation for the battery components in both indoor heating and indoor cooling modes. In indoor heating mode, if the compressor 10 is turned on and used to raise the indoor temperature, the refrigerant enters the first channel 232 through the fourth one-way valve 22 and is divided into three paths. The flow principles of the first and second branches have been explained in the above embodiments and will not be repeated here. The third branch enters the first channel 232 of the battery heat exchanger 31 through the third throttle valve 32 and merges with the first branch before entering the gas-liquid separator 12. They then enter the gas-liquid separator 12 together and return to the compressor 10 inlet. In indoor cooling mode, if compressor 10 is turned on and 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 flow principles of the first and second branches have been explained in the above embodiments and will not be repeated here. The third branch enters the first channel 232 of the battery heat exchanger 31 through the third throttle valve 32, and then merges with the first branch before entering the gas-liquid separator 12. They then enter the gas-liquid separator 12 together and return to the compressor 10 inlet. In other words, the enthalpy-increasing air conditioning system can bring the heat from the battery pack back to the compressor 10 in both indoor heating and indoor cooling modes, thereby recovering battery heat and helping to reduce energy consumption.

[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 installed on the pipeline between the heat exchange plate 34 and the second flow channel 312, and the room temperature detection device may be installed near the indoor heat exchanger 21.

[0068] This application also provides an electric vehicle, including the enthalpy-enhancing air conditioning system described above.

[0069] This application also provides a control method for an enthalpy-increasing air conditioning system, which is applied to the enthalpy-increasing air conditioning system described in the above embodiments.

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

[0071] Indoor heating control steps:

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

[0073] S12, detecting the actual indoor temperature T11 in real time, and determining whether T10>T11 is true, if yes, starting the compressor 10, the first throttling valve 24 and the second throttling valve 231, closing the first bypass pipeline 28 and the second bypass pipeline 29, and controlling the valve assembly to control the refrigerant to flow through the indoor heat exchanger 21, the first channel 232, and then to the outdoor heat exchanger 27 and the second channel 233 respectively; if not, closing the first throttling valve 24.

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

[0075] The above steps are that, when the enthalpy increasing air conditioning system enters the heating mode, first entering the standby state, in the standby state, setting the preset indoor temperature T10, and detecting the actual indoor temperature T11 in real time, when finding that the preset indoor temperature T10 is higher than the actual indoor temperature T11, heating the indoor environment, starting the compressor 10, the first throttling valve 24, the second throttling valve 231, the first one-way valve 25, the fourth one-way valve 22, the indoor fan 211 and the outdoor fan, and closing the second one-way valve 291 and the third one-way valve 281. The refrigerant flow in the heating mode has been described in the above embodiment, and will not be repeated here. When the preset indoor temperature T10 is not higher than the actual indoor temperature T11, at this time, the indoor environment does not need to be heated, therefore, the first throttling valve 24 can be closed, to avoid affecting the control of the battery assembly heat dissipation, the compressor 10 does not need to be closed. When the enthalpy increasing air conditioning system is always in the heating mode, the step S12 is repeatedly until the enthalpy increasing air conditioning system exits the heating mode, and the step S12 stops.

[0076] Battery assembly heat dissipation control step:

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

[0078] S31, detecting the actual water outlet temperature T32 of the heat exchange plate 34 in real time, determining whether T32>T33 is true, if yes, starting the compressor 10, the second throttling valve 231, the third throttling valve 32 and the circulating pump 33, closing the first bypass pipeline 28 and the second bypass pipeline 29, and controlling the valve assembly to control the refrigerant to flow through the indoor heat exchanger 21 and the first channel 232, and then to the battery heat dissipation heat exchanger 31 and the second channel 233 respectively; if not, closing the third throttling valve 32 and the circulating pump 33.

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

[0080] The above steps, namely, when the enthalpy increasing air conditioning system enters the heating mode, 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 assembly 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 started, the compressor 10 is kept in the started state), the second throttling valve 231, the third throttling valve 32, the fourth one-way valve 22, the indoor fan 211 and the circulating pump 33 are started, and the second one-way valve 291 and the third one-way valve 281 are closed. As shown in FIG. Figure 3 At this time, if the indoor temperature is rising, the refrigerant flowing out of the first channel 232 is divided into three paths and flows back to the compressor 10; if the indoor temperature is not rising, only the battery assembly is cooled, the refrigerant flowing out of the first channel 232 can be divided into two paths (second branch and third branch) and flows 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 assembly at this time can meet the working range, and the battery assembly does not need to be cooled down, therefore, the third throttling valve 32 and the circulating pump 33 can be closed, and the compressor 10 does not need to be closed. At this time, if the indoor temperature is rising, the refrigerant flowing out of the first channel 232 can be divided into two paths (first branch and second branch) and flows back to the compressor 10.

[0081] The indoor temperature rising control step and the battery assembly cooling control step described above can be executed simultaneously, respectively, or independently.

[0082] As shown in FIG. Figure 6 In the indoor cooling mode, the enthalpy increasing air conditioning system enters the standby state, and the following steps are executed.

[0083] Indoor temperature rising control step:

[0084] S20, set the indoor preset temperature T20.

[0085] S22, start the indoor fan 211 in the ventilation mode, detect the actual indoor temperature T21 in real time, and judge whether T20

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

[0087] The above step is also that when the enthalpy increasing air conditioning system enters the refrigeration mode, first control the compressor 10 to enter the standby state, in the standby state, open the ventilation mode of the indoor fan 211, set the indoor preset temperature T20, and detect the actual temperature T21 in real time, when it is found that the indoor preset temperature T20 is lower than the actual temperature T21 of the indoor, that is, the indoor environment is cooled, the compressor 10, the first throttling valve 24, the second throttling valve 231, the second one-way valve 291, the third one-way valve 281, the indoor fan 211 and the outdoor fan are opened, and the first one-way valve 25 and the fourth one-way valve 22 are closed. The flow direction of the refrigerant is described above. When the indoor preset temperature T20 is not lower than the actual temperature T21 of the indoor, at this time, the indoor environment does not need to be cooled, therefore, the first throttling valve 24 can be closed, in order to avoid affecting the control of the battery assembly heat dissipation, the compressor 10 does not need to be closed. When the enthalpy increasing air conditioning system is always in the refrigeration mode, step S22 is repeatedly performed until the enthalpy increasing air conditioning system exits the refrigeration mode, and step S22 is stopped.

[0088] Battery assembly heat dissipation control step:

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

[0090] S41, detect the actual water outlet temperature T42 of the heat exchange plate 34 in real time, judge whether T42>T43 is established, if yes, open the compressor 10, the second throttling valve 231, the third throttling valve 32, the circulating pump 33 and the first bypass pipeline 28; control the valve assembly to control the refrigerant to flow through the outdoor heat exchanger 27, the first bypass pipeline 28 and the first channel 232 in turn, and then flow to the second channel 233 and the third throttling valve 32 respectively; if not, close the third throttling valve 32 and the circulating pump 33.

[0091] S42, repeat step S41 until the enthalpy increasing air conditioning system exits the refrigeration mode.

[0092] This step is also, when the enthalpy increasing air conditioning system enters the refrigeration mode, first into standby state, in standby state, set the preset outlet water temperature T43 of heat exchange plate 34, and the actual outlet water temperature T42 of heat exchange plate 34 is detected in real time, when it is found that the actual outlet water temperature T42 of heat exchange plate 34 is higher than the preset outlet water temperature T43 of heat exchange plate 34, it is explained that the temperature of battery assembly is too high at this time, it needs to be cooled, at this time, start compressor 10 (such as compressor 10 has been started, then keep compressor 10 open state), second throttle valve 231, third throttle valve 32, third check valve 281, indoor fan 211 and circulating pump 33, at the same time, close first check valve 25 and fourth check valve 22. Figure 4 As shown, at this time, if the indoor is in cooling state, then the refrigerant flowing out of the first channel 232 is divided into three paths and flows back to the compressor 10; if the indoor is not in cooling state, only the battery assembly is cooled, then the refrigerant flowing out of the first channel 232 can be divided into two paths (second branch and third branch) and flows back to the compressor 10. When the actual outlet water temperature T32 of heat exchange plate 34 is not higher than the preset outlet water temperature T33 of heat exchange plate 34, it is explained that the temperature of 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 is in cooling state, then the refrigerant flowing out of the first channel 232 can be divided into two paths (first branch and second branch) and flows back to the compressor 10.

[0093] If the indoor environment has neither refrigeration demand nor heating demand, the heat dissipation control of the battery assembly can still be realized, at this time, the following steps can be executed:

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

[0095] S51, detect the actual outlet water temperature T52 of heat exchange plate 34 in real time, judge whether T52>T53 is established, if yes, start the compressor 10, the second throttle valve 231, the third throttle valve 32 and the circulating pump 33, close the first bypass pipe 28 and the second bypass pipe 29; control the valve assembly to control the refrigerant to flow through the indoor heat exchanger 21 and the first channel 232 in turn, and then flow to the battery cooling heat exchanger 31 and the second channel 233 respectively; if not, close the third throttle valve 32 and the circulating pump 33.

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

[0097] From the above control steps, no matter whether the enthalpy-increasing air conditioning system is in the indoor heating mode or in the indoor cooling mode, the enthalpy-increasing function of the compressor can be realized, the performance of the compressor can be effectively improved, and the energy consumption can be reduced. Meanwhile, the indoor temperature control and the battery assembly heat dissipation control do not interfere with each other, and can work independently. The two systems are integrated together, the volume and weight of the entire system are reduced, and the two systems are organically combined. When the battery assembly is cooled, the heat thereof can be recycled, the inlet temperature of the compressor is improved, and thus the energy efficiency ratio of the compressor is improved. No matter whether the indoor heating mode or the indoor cooling mode is used, the heat dissipation of the battery assembly can be realized, and the waste heat can be recycled.

[0098] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus 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 can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An enthalpy increasing air conditioning system, characterized by, Comprise: Compressor, reversing valve, indoor heat exchanger, economizer, outdoor heat exchanger, first throttling valve, second throttling valve, first bypass pipeline, control valve assembly and second bypass pipeline; also include battery thermal management system, the battery thermal management system includes battery heat dissipation heat exchanger and third throttling valve; Wherein: the economizer includes the first channel and the second channel that can be mutually heat exchanged, the indoor heat exchanger, the first channel, the first throttling valve and the outdoor heat exchanger are sequentially connected, the inlet of the second throttling valve is connected between the first channel and the first throttling valve, the outlet of the second throttling valve is connected the inlet of the second channel, the outlet of the second channel is connected the enthalpy increasing port of the compressor;The one end of the first bypass pipeline and the second bypass pipeline is connected between the outdoor heat exchanger and the first throttling valve respectively, and the other end is connected between the indoor heat exchanger and the first channel respectively; The inlet of the third throttling valve is connected between the first channel and the first throttling valve, the outlet of the third throttling valve is connected the inlet of the battery heat dissipation heat exchanger, the outlet of the battery heat dissipation heat exchanger is connected the suction port of the compressor, and the battery heat dissipation heat exchanger is used for heat exchange with battery assembly; The two ends of the first bypass pipeline are connected with the first connection point and the second connection point of the main pipeline respectively, and the two ends of the second bypass pipeline are connected with the third connection point and the fourth connection point of the main pipeline respectively;The first connection point and the third connection point are located between the outdoor heat exchanger and the first throttling valve respectively, and the first connection point is arranged close to the outdoor heat exchanger;The second connection point and the fourth connection point are located between the indoor heat exchanger and the first channel respectively, and the second connection point is arranged close to the economizer; The control valve assembly includes first one-way valve, second one-way valve, third one-way valve and fourth one-way valve, the first one-way valve is arranged on the main pipeline between the first connection point and the third connection point, the second one-way valve is arranged on the second bypass pipeline, the third one-way valve is arranged on the first bypass pipeline, and the fourth one-way valve is arranged on the main pipeline between the second connection point and the fourth connection point; In indoor heating mode, the exhaust port of the compressor is communicated with the indoor heat exchanger through the reversing valve, and the outdoor heat exchanger is communicated with the suction port through the reversing valve, and the control valve assembly is used for closing 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 turn; In indoor cooling mode, the exhaust port is communicated with the outdoor heat exchanger through the reversing valve, and the indoor heat exchanger is communicated with the suction port through the reversing valve, and the control valve assembly is used for opening the first bypass pipeline and the second bypass pipeline, and can control the refrigerant to flow through the outdoor heat exchanger, the first bypass pipeline, the first channel, the second bypass pipeline and the indoor heat exchanger in turn.

2. The boosted thermodynamic air conditioning system of claim 1, wherein, The gas-liquid separator and the dry filter are further included; the reversing valve includes a first interface, a second interface, a third interface and a fourth interface; The outlet of the gas-liquid separator is connected with the suction port, the exhaust port is connected with the first interface, the inlet of the gas-liquid separator is connected with the fourth interface and the outlet of the battery heat dissipation heat exchanger respectively, the indoor heat exchanger, the first channel, the first throttling valve, the dry filter and the outdoor heat exchanger are sequentially connected in series, one port of the outdoor heat exchanger is connected with the second interface, and one port of the indoor heat exchanger is connected with the third interface, thereby forming a circulating loop.

3. The boosted thermodynamic air conditioning system of claim 2, wherein, The battery heat dissipation heat exchanger includes a first flow channel and a second flow channel which can exchange heat with each other; the inlet of the first flow channel is connected with the outlet of the third throttling valve, and the outlet of the first flow channel is connected with the inlet of the gas-liquid separator; the second flow channel is used for circulating a cold carrier, and the cold carrier is used for heat exchange with the battery assembly.

4. The boosted thermodynamic air conditioning system of claim 3, wherein, The battery heat management system further includes a circulating pump and a heat exchange plate which are in circulation communication with the second flow channel, and the heat exchange plate is used for heat exchange with the battery assembly.

5. The boosted thermodynamic air conditioning system of claim 4, wherein, A water temperature detection device and a room temperature detection device are further included, the water temperature detection device is used for detecting the temperature of the cold carrier flowing out of the heat exchange plate, and the room temperature detection device is used for detecting the temperature of the indoor environment in which the indoor heat exchanger is located.

6. An electric vehicle, characterized by The application further relates to an enthalpy-increasing air conditioning system.

7. A control method of a boosted air conditioning system, characterized by, The application further relates to an enthalpy-increasing air conditioning system. 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 the following steps are performed: S10, setting an indoor preset temperature T10; S12, detecting an actual indoor temperature T11 in real time, and determining whether T10>T11 is established, if yes, starting the compressor, the first throttling valve and the second throttling valve, closing the first bypass pipeline and the second bypass pipeline, and controlling the control valve assembly to control the refrigerant to flow through the indoor heat exchanger, the first channel in sequence, and then flow to the outdoor heat exchanger and the second channel respectively; if not, closing the first throttling valve; S13, repeatedly performing 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 the following steps are performed: S20, setting an indoor preset temperature T20; S22, starting an indoor fan ventilation mode, detecting an actual indoor temperature T21 in real time, and determining whether T20 S23, repeatedly performing step S22 until the enthalpy-increasing air conditioning system exits the cooling mode.

8. The control method of the boosted air conditioning system according to claim 7, wherein, The enthalpy-increasing air conditioning system further comprises a battery thermal management system, the battery thermal management system comprising a battery heat dissipation heat exchanger and a third throttling valve connected in series; the battery heat dissipation heat exchanger comprising a first flow channel and a second flow channel capable of exchanging heat with each other; an outlet of the first flow channel being connected to a suction port of the compressor, and an inlet of the third throttling valve being connected to an outlet of the first flow channel; the battery thermal management system further comprising a circulating pump and a heat exchange plate in circulation communication with the second flow channel, the heat exchange plate being used for exchanging heat with the battery assembly; In the indoor heating mode, the control method of the enthalpy-increasing air conditioning system further comprises the following steps: S30, setting a preset outlet water temperature T33 of the heat exchange plate; S31, detecting an actual outlet water temperature T32 of the heat exchange plate in real time, and determining whether T32>T33 is established, if yes, turning on the compressor, the second throttling valve, the third throttling valve and the circulating pump, and turning off 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 flow channel in sequence, and then flow to the battery heat dissipation heat exchanger and the second flow channel respectively; if not, turning off the third throttling valve and the circulating pump; S32, repeatedly executing step S31 until the battery assembly stops working; In the indoor heating mode, the control method of the enthalpy-increasing air conditioning system further comprises the following steps: S40, setting a preset outlet water temperature T43 of the heat exchange plate; S41, detecting an actual outlet water temperature T42 of the heat exchange plate in real time, and determining whether T42>T43 is established, if yes, turning on the compressor, the second throttling valve, the third throttling valve, the circulating 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 flow channel in sequence, and then flow to the second flow channel and the third throttling valve respectively; if not, turning off the third throttling valve and the circulating pump; S42, repeatedly executing step S41 until the battery assembly stops working.

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