Air conditioning system and control method thereof

Abstract

The invention belongs to the field of air conditioners, and discloses an air conditioning system and a control method of the air conditioning system, and the air conditioning system comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger, a battery heat dissipation heat exchanger, a first expansion valve, a second expansion valve, a defrosting coil pipe and a three-way valve. The dual functions of indoor heating and battery heat dissipation are achieved. And in the heating mode, heat generated by the battery is recycled and used for air conditioner heating through the first channel and the second channel which can exchange heat with each other, so that the system can effectively dissipate heat of the battery while heating indoors. Meanwhile, through the integrated design of the defrosting coil pipe and the outdoor heat exchanger, the system is allowed to guide the high-temperature cooling liquid of the battery unit to the defrosting coil pipe through the three-way valve when needed, and the outdoor heat exchanger is defrosted through heat generated by the battery. By means of the design, the defrosting efficiency is improved, heat exchange performance reduction caused by frosting is reduced, and the heating capacity of the air conditioning system is further improved.

Description

Technical Field

[0001] The present invention relates to the field of air conditioning, and in particular to an air conditioning system and a control method of the air conditioning system. Background Art

[0002] With the rapid development of electric vehicle technology, higher requirements are placed on the vehicle's thermal management system. In electric vehicles, the air conditioning system not only needs to provide a comfortable indoor environment for passengers, but also needs to effectively manage the thermal state of the battery to ensure the performance and life of the battery. Existing air conditioning systems usually include basic components such as compressors, outdoor heat exchangers, and indoor heat exchangers to achieve the cooling and heating functions of the vehicle.

[0003] In the process of realizing the present invention, the inventors found that the prior art has at least the following technical problems: the existing automobile air conditioning system is mainly designed to focus on the temperature control requirements of the passenger compartment, but does not take into account the need for heat dissipation of the battery. Especially in winter, when the interior needs to be heated, if the battery also needs to be cooled, it is difficult for the existing system to meet both requirements at the same time. In addition, the outdoor heat exchanger of the existing system is prone to frost in the heating mode, which will seriously affect the heat exchange efficiency and reduce the heating capacity of the air conditioning system.

[0004] Therefore, how to simultaneously meet the heat dissipation requirements of the battery and the heating requirements of the air conditioner, and improve the heating capacity of the air conditioning system is a technical problem to be solved by those skilled in the art. Summary of the invention

[0005] In order to effectively solve the problem in the prior art that the heat dissipation demand of the battery and the heating demand of the air conditioner cannot be met simultaneously and the heating capacity of the air conditioning system is poor, the present invention provides an air conditioning system and a control method of the air conditioning system.

[0006] An air conditioning system, comprising: a compressor, an outdoor heat exchanger, an indoor heat exchanger, a battery heat dissipation heat exchanger, a first expansion valve, a second expansion valve, a defrost coil, and a three-way valve; One end of the indoor heat exchanger is connected to the exhaust port of the compressor, and the other end is connected to one end of the outdoor heat exchanger through the first expansion valve, and the other end of the outdoor heat exchanger is connected to the air intake port of the compressor; The battery heat dissipation heat exchanger includes a first channel and a second channel that can exchange heat with each other, one end of the second expansion valve is connected between the indoor heat exchanger and the first expansion valve, and the other end is connected to one end of the first channel, the other end of the first channel is connected to the air intake port of the compressor, and the second channel is used to be connected in series with the battery unit to cool the high-temperature coolant of the battery unit into a low-temperature coolant; The defrost coil is arranged adjacent to the outdoor heat exchanger, and the defrost coil and the outdoor heat exchanger share an outdoor fan; The first end of the three-way valve is used to connect to the battery unit, the second end is connected to the water inlet of the defrost coil, and the third end is connected to the second channel. The water outlet of the defrost coil is connected between the third end and the second channel to output the high-temperature coolant of the battery unit to the defrost coil or the battery heat dissipation heat exchanger.

[0007] Optionally, the air conditioning system further comprises a four-way reversing valve, wherein: The first interface of the four-way reversing valve is connected to the exhaust port of the compressor, the second interface of the four-way reversing valve is connected to the outdoor heat exchanger, the third interface of the four-way reversing valve is connected to the indoor heat exchanger, and the fourth interface of the four-way reversing valve is connected to the suction port of the compressor; When the four-way reversing valve is in the first state, the first interface is connected to the third interface, and the second interface is connected to the fourth interface; when the four-way reversing valve is in the second state, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

[0008] Optionally, the air conditioning system further includes: A gas-liquid separator, located between the fourth interface of the four-way reversing valve and the air intake of the compressor; an indoor fan, disposed adjacent to the indoor heat exchanger, for achieving forced convection heat exchange between the indoor heat exchanger and indoor air; The outdoor fan is arranged adjacent to the outdoor heat exchanger and is used to realize forced convection heat exchange between the outdoor heat exchanger and outdoor air.

[0009] Optionally, the air conditioning system further includes: A drying filter is located between the outdoor heat exchanger and the first expansion valve.

[0010] Optionally, the air conditioning system further includes a third expansion valve, wherein: One end of the third expansion valve is connected between the drying filter and the first expansion valve, and the other end of the third expansion valve is connected between the first channel and the second expansion valve.

[0011] Optionally, the air conditioning system further comprises a water pump, wherein: One end of the water pump is connected to one end of the second channel, and the other end is used to connect to the water inlet of the battery unit, and the water outlet of the battery unit is used to connect to the first end of the three-way valve; The second end of the three-way valve is connected to the water inlet of the defrost coil, and the third end of the three-way valve is connected to the other end of the second channel; When the three-way valve is opened, the first end is connected to the second end, and the first end is not connected to the third end; when the three-way valve is closed, the first end is not connected to the second end, and the first end is connected to the third end.

[0012] Optionally, the air conditioning system further comprises an expansion water tank, wherein: One end of the expansion water tank is connected between the first end of the three-way valve and the water outlet of the battery unit, and the other end is connected between the second channel and the water pump.

[0013] A control method for an air conditioning system, applied to any of the air conditioning systems described above, comprising: Obtaining the operating mode and operating parameters of the air conditioning system; When the operation mode is the indoor heating mode and the battery cooling mode, the four-way reversing valve is controlled to be in a first state, and the battery set temperature is determined according to the operation parameters; Detecting a first outlet water temperature of a defrost coil and a second outlet water temperature of a battery unit, and determining whether the battery set temperature is less than the second outlet water temperature; If yes, determine whether the compressor, indoor fan, outdoor fan, and first expansion valve are in the open state; If it is in the open state, the three-way valve and the water pump are controlled to be in the open state; Determining whether the first water outlet temperature is greater than the battery set temperature; If the first outlet water temperature is greater than the battery set temperature, opening the second expansion valve; If the first water outlet temperature is less than or equal to the battery setting temperature, determining whether the battery setting temperature is greater than or equal to the second water outlet temperature; If the battery set temperature is lower than the second water outlet temperature, the process returns to the step of determining whether the compressor, the indoor fan, the outdoor fan, and the first expansion valve are in an open state; If the battery set temperature is greater than or equal to the second water outlet temperature, the water pump, the three-way valve and the second expansion valve are controlled to be in a closed state; determining whether the air conditioning system exits a battery cooling mode according to the operating mode; If the battery cooling mode is not exited, returning to the step of detecting the first outlet water temperature of the defrost coil and the second outlet water temperature of the battery unit, and determining whether the battery set temperature is less than the second outlet water temperature; If the battery cooling mode is exited, the battery cooling mode will end.

[0014] Optionally, after determining whether the compressor, the indoor fan, the outdoor fan, and the first expansion valve are in an open state, the method further includes: When the compressor, the indoor fan, the outdoor fan, and the first expansion valve are not in an open state, controlling the four-way reversing valve to be in a second state; Controlling the water pump, the compressor, the outdoor fan, and the third expansion valve to be in an open state, and controlling the three-way valve to be in a closed state; Determining whether the battery set temperature is greater than or equal to the second water outlet temperature; If not, return to the step of controlling the water pump, the compressor, the outdoor fan, and the third expansion valve to be in an open state, and controlling the three-way valve to be in a closed state; If yes, control the water pump, the compressor, the outdoor fan, and the third expansion valve to be in a closed state; determining whether the air conditioning system exits a battery cooling mode according to the operating mode; If the battery cooling mode is not exited, returning to the step of detecting the first outlet water temperature of the defrost coil and the second outlet water temperature of the battery unit, and determining whether the battery set temperature is less than the second outlet water temperature; If the battery cooling mode is exited, the battery cooling mode will end.

[0015] Optionally, when the operation mode is an indoor heating mode and a battery heat dissipation mode, the method further includes: Determining the indoor set temperature according to the operating parameters; Detecting the indoor temperature and determining whether the indoor set temperature is greater than the indoor temperature; If yes, control the compressor, the indoor fan, the outdoor fan, and the first expansion valve to be in an open state; Determining whether the indoor set temperature is less than or equal to the indoor temperature; If the indoor set temperature is less than or equal to the indoor temperature, the compressor, the indoor fan, the outdoor fan, and the first expansion valve are controlled to be in a closed state; When the compressor, the indoor fan, the outdoor fan, and the first expansion valve are in a closed state, judging whether the air conditioning system exits the indoor heating mode according to the operation mode; If the indoor heating mode is not exited, returning to the step of detecting the indoor temperature and determining whether the indoor set temperature is greater than the indoor temperature; If the indoor heating mode is exited, the indoor heating mode is ended.

[0016] The air conditioning system provided by the embodiment of the present invention has at least the following beneficial effects: The air conditioning system provided by the present invention realizes the dual functions of indoor heating and battery heat dissipation by integrating a compressor, an outdoor heat exchanger, an indoor heat exchanger, a battery heat dissipation heat exchanger, a first expansion valve, a second expansion valve, a defrost coil and a three-way valve. In the heating mode, the heat generated by the battery is recovered and used for air conditioning heating through the first channel and the second channel that can exchange heat with each other, so that the system can effectively dissipate heat from the battery while heating the room, greatly improving the heating capacity of the air conditioner. At the same time, through the integrated design of the defrost coil and the outdoor heat exchanger, the system is allowed to guide the high-temperature coolant of the battery unit to the defrost coil through the three-way valve when necessary, and use the heat generated by the battery to defrost the outdoor heat exchanger. This design not only improves the defrosting efficiency, but also reduces the degradation of heat exchange performance caused by frosting, further improving the heating capacity of the air conditioning system. This design simplifies the system structure, reduces energy consumption, and improves the thermal management efficiency and reliability of the entire vehicle.

[0017] In summary, the present invention can effectively improve the problem in the prior art that the heat dissipation demand of the battery and the heating demand of the air conditioner cannot be met simultaneously, and the heating capacity of the air conditioning system is poor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of the structure of an air conditioning system provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a three-way valve 12 provided in an embodiment of the present invention; Figure 3 A schematic diagram of an air conditioning system provided by an embodiment of the present invention when it is in an air conditioning heating mode and a battery cooling mode at the same time; Figure 4 A schematic diagram of an air conditioning system provided by an embodiment of the present invention when it is only in a battery heat dissipation mode; Figure 5 A schematic diagram of an air conditioning system provided by an embodiment of the present invention when it is only in air conditioning heating mode; Figure 6 A flow chart of a method for controlling an air conditioning system provided by an embodiment of the present invention; Figure 7 A flow chart of another air conditioning system control method provided by an embodiment of the present invention; Figure 8 The present invention provides a flowchart of another method for controlling an air conditioning system.

[0020] Description of reference numerals: 1. Compressor, 101. Air intake port, 102. Air exhaust port, 2. Four-way reversing valve, 201. First interface, 202. Second interface, 203. Third interface, 204. Fourth interface, 3. Outdoor fan, 4. Outdoor heat exchanger, 5. Dry filter, 6. First expansion valve, 7. Second expansion valve, 8. Battery heat dissipation heat exchanger, 801. First channel, 802. Second channel, 9. Indoor heat exchanger, 10. Indoor fan, 11. Gas-liquid separator, 12. Three-way valve, 1201. First end, 1202. Second end, 1203. Third end, 13. Third expansion valve, 14. Water pump, 15. Battery unit, 16. Expansion water tank. DETAILED DESCRIPTION

[0021] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] It should be clear that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0024] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0025] Please refer to Figure 1 , is a schematic diagram of the structure of an air conditioning system provided by an embodiment of the present invention, the air conditioning system can be applied to new energy vehicles, and the new energy vehicles may include electric buses, electric logistics vehicles, electric trucks, and electric engineering vehicles. Figure 1 As shown, the air conditioning system includes: Compressor 1, outdoor heat exchanger 4, indoor heat exchanger 9, battery heat dissipation heat exchanger 8, first expansion valve 6, second expansion valve 7, defrost coil, three-way valve 12; One end of the indoor heat exchanger 9 is connected to the exhaust port 102 of the compressor 1, and the other end is connected to one end of the outdoor heat exchanger 4 through the first expansion valve 6, and the other end of the outdoor heat exchanger 4 is connected to the air intake port 101 of the compressor 1; The battery heat dissipation heat exchanger 8 includes a first channel 801 and a second channel 802 that can exchange heat with each other. One end of the second expansion valve 7 is connected between the indoor heat exchanger 9 and the first expansion valve 6, and the other end is connected to one end of the first channel 801. The other end of the first channel 801 is connected to the air intake port 101 of the compressor 1. The second channel 802 is used to be connected in series with the battery unit 15 to cool the high-temperature coolant in the battery unit 15 into a low-temperature coolant. The defrost coil is arranged adjacent to the outdoor heat exchanger 4, that is, the defrost coil is arranged on one side of the outdoor heat exchanger 4, such as the air inlet side, and the defrost coil and the outdoor heat exchanger 4 share the outdoor fan 3. The three-way valve 12 is used to connect to the defrost coil, the second channel 802 and the battery unit 15 respectively to output the high-temperature coolant of the battery unit 15 to the defrost coil or the battery heat dissipation heat exchanger 8. Specifically, the first end 1201 of the three-way valve 12 is used to connect to the water outlet of the battery cell 15, the second end 1202 of the three-way valve 12 is connected to the water inlet of the defrost coil, the third end 1203 of the three-way valve 12 is connected to the water inlet of the second channel 802, the water outlet of the second channel 802 is used to connect to the water inlet of the battery cell 15, and the water outlet of the defrost coil is connected between the third end 1203 and the second channel 802. When defrosting is required, the three-way valve 12 is opened, the first end 1201 and the second end 1202 of the three-way valve 12 are connected, and the third end 1203 is cut off, and the high-temperature coolant from the battery cell 15 flows into the defrost coil and releases heat to the outside to defrost the outdoor heat exchanger 4. In this embodiment, the defrost coil and the outdoor heat exchanger 4 share the outdoor fan 3, which can reduce the equipment investment cost, and the defrost coil and the outdoor heat exchanger 4 can also be integrated into one to further reduce space occupancy and improve space utilization. Of course, the defrost coil and the outdoor heat exchanger 4 can also be separately set to facilitate maintenance.

[0026] It is understandable that the battery unit 15 may include a battery and a battery heat exchange structure that contacts and exchanges heat with the battery, and a coolant may flow through the battery heat exchange structure, so that the low-temperature coolant flows into the heat exchange structure to absorb the heat from the battery and convert it into a high-temperature coolant, and the high-temperature coolant flows through the second channel 802 of the battery heat dissipation heat exchanger 8, and exchanges heat with the low-temperature refrigerant in the first channel 801, so that the heat carried by the coolant is transferred to the refrigerant, thereby obtaining a low-temperature coolant, and the low-temperature coolant flows back to the battery heat exchange structure, and the cycle is repeated to continuously meet the battery heat dissipation requirements. It should be noted that the battery of the battery unit 15 can be a whole vehicle battery of a new energy vehicle.

[0027] In this embodiment, one end of the indoor heat exchanger 9 is connected to the exhaust port 102 of the compressor 1, and the other end is connected to one end of the outdoor heat exchanger 4 through the first expansion valve 6, and the other end of the outdoor heat exchanger 4 is connected to the intake port 101 of the compressor 1, thereby forming an efficient heat exchange and refrigerant circulation system.

[0028] When the compressor 1 is working, the air intake is completed through the air intake port 101, and the cylinder compresses the refrigerant into a high-temperature and high-pressure gas, and sends it to the indoor heat exchanger 9 through the exhaust port 102. Here, the refrigerant exchanges heat with the indoor air through the indoor heat exchanger 9, releases heat, and warms the air in the car. Subsequently, the refrigerant passes through the first expansion valve 6, throttles and reduces the pressure, becomes a low-temperature and low-pressure liquid (or a gas-liquid mixture), and flows to the outdoor heat exchanger 4. In the outdoor heat exchanger 4, the refrigerant absorbs the heat of the outside air, evaporates into a gaseous state, and then returns to the air intake port 101 of the compressor 1 through the other end of the outdoor heat exchanger 4.

[0029] In this embodiment, by setting one end of the second expansion valve 7 to be connected between the indoor heat exchanger 9 and the first expansion valve 6, and the other end to be connected to one end of the first channel 801, and the other end of the first channel 801 to be connected to the air intake port 101 of the compressor 1, a circuit capable of independently controlling the heat dissipation of the battery is constructed. When the battery heat dissipation heat exchanger 8 needs to work, the medium-temperature and high-pressure liquid refrigerant flows out of the indoor heat exchanger 9, passes through the throttling of the second expansion valve 7, and is transformed into a low-temperature and low-pressure gas-liquid two-phase state. This transformation enables the refrigerant to more effectively absorb the heat generated by the battery when entering the first channel 801. The design of the first channel 801 allows the refrigerant to exchange heat with the high-temperature coolant in the battery unit 15, thereby achieving heat dissipation of the battery.

[0030] During the heat exchange process, the coolant in the battery unit 15 releases heat to the refrigerant, lowers its own temperature, and then circulates back to the battery unit 15 to continue absorbing heat, maintaining the battery within a safe operating temperature range. After the heat exchange, the temperature of the refrigerant increases, and enters the air intake 101 of the compressor 1 through the other end of the first channel 801, ready for the next cycle.

[0031] In this embodiment, a defrost coil is arranged adjacent to the outdoor heat exchanger 4, and a three-way valve 12 is arranged to be connected to the defrost coil, the second channel 802 and the battery unit 15 respectively, so that the high-temperature coolant of the battery unit 15 can be output to the defrost coil or the battery heat exchanger 8.

[0032] By arranging a defrost coil next to the outdoor heat exchanger 4 and configuring a three-way valve 12 so that the high-temperature coolant of the battery unit 15 can be directed to the defrost coil or the battery heat dissipation heat exchanger 8, the air conditioning system of the present invention can efficiently utilize the heat generated by the battery during the discharge process. This design allows the three-way valve 12 to direct the high-temperature coolant in the battery unit 15 to the defrost coil when frost forms on the surface of the outdoor heat exchanger 4 in cold climates, and use its heat for defrosting, thereby maintaining the efficient heat exchange performance of the outdoor heat exchanger 4. At the same time, when defrosting is not required, the three-way valve 12 can directly guide the high-temperature coolant to the battery heat dissipation heat exchanger 8 to achieve effective heat dissipation of the battery, ensure that the battery operates within the optimal temperature range, and extend its service life. This heat management strategy not only improves the energy efficiency of the air conditioning system, but also enhances the reliability and performance of electric vehicles under extreme climate conditions.

[0033] On the basis of the above embodiments, in some embodiments, the air conditioning system further includes a four-way reversing valve 2, wherein: The first interface 201 of the four-way reversing valve 2 is connected to the exhaust port 102 of the compressor 1, the second interface 202 of the four-way reversing valve 2 is connected to the outdoor heat exchanger 4, the third interface 203 of the four-way reversing valve 2 is connected to the indoor heat exchanger 9, and the fourth interface 204 of the four-way reversing valve 2 is connected to the suction port 101 of the compressor 1; When the four-way reversing valve 2 is in the first state, the first interface 201 is connected to the third interface 203, and the second interface 202 is connected to the fourth interface 204; when the four-way reversing valve 2 is in the second state, the first interface 201 is connected to the second interface 202, and the third interface 203 is connected to the fourth interface 204.

[0034] In this embodiment, the design of the four-way reversing valve 2 includes four interfaces, wherein the first interface 201 is connected to the exhaust port 102 of the compressor 1 to ensure that the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 can enter the outdoor heat exchanger 4 or the indoor heat exchanger 9 for condensation; the second interface 202 is connected to the outdoor heat exchanger 4 to ensure that the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 can flow into the outdoor heat exchanger 4 for condensation when the system is only in the battery cooling mode, and at the same time to ensure that the low-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 can flow into the outdoor heat exchanger 4 for condensation when the system is only in the air conditioning heating mode, or in the air conditioning heating mode and the battery cooling mode at the same time. The high-temperature and low-pressure gaseous refrigerant can return to the compressor 1; the third interface 203 is connected to the indoor heat exchanger 9, and is used to ensure that when the system is in the air-conditioning heating mode only, or in the air-conditioning heating mode and the battery cooling mode at the same time, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 in the heating mode can flow into the indoor heat exchanger 9 for condensation. It is also used to ensure that when the air-conditioning system is in the cooling mode, the low-temperature and low-pressure gaseous refrigerant passing through the indoor heat exchanger 9 can return to the compressor 1; the fourth interface 204 is connected to the air intake port 101 of the compressor 1, so as to ensure that the low-temperature and low-pressure gaseous refrigerant can smoothly return to the compressor 1 for the next cycle.

[0035] In the first state, the first interface 201 and the third interface 203 of the four-way reversing valve 2 are connected, so that the high-temperature and high-pressure refrigerant flows to the indoor heat exchanger 9 for condensation, and the second interface 202 and the fourth interface 204 are connected, allowing the refrigerant passing through the outdoor heat exchanger 4 to flow back to the compressor 1. In the second state, the first interface 201 and the second interface 202 of the four-way reversing valve 2 are connected, so that the high-temperature and high-pressure refrigerant flows to the outdoor heat exchanger 4 for condensation, and the third interface 203 and the fourth interface 204 are connected, allowing the refrigerant passing through the indoor heat exchanger 9 to flow back to the compressor 1.

[0036] Based on the above embodiments, in some embodiments, the air conditioning system further includes: The gas-liquid separator 11 is located between the fourth interface 204 of the four-way reversing valve 2 and the air intake port 101 of the compressor 1, that is, the gas-liquid separator 11 is connected between the fourth interface 204 and the air intake port 101; An indoor fan 10 is disposed adjacent to the indoor heat exchanger 9, for example, on the air outlet side or air inlet side of the indoor heat exchanger 9, and is used to realize forced convection heat exchange between the indoor heat exchanger 9 and the indoor air; The outdoor fan 3 is disposed adjacent to the outdoor heat exchanger 4, for example, at the air outlet side or the air inlet side of the outdoor heat exchanger 4, for realizing forced convection heat exchange between the outdoor heat exchanger 4 and the outdoor air.

[0037] In this embodiment, the gas-liquid separator 11 is located between the fourth interface 204 of the four-way reversing valve 2 and the air intake 101 of the compressor 1. Its main function is to prevent the low-pressure and low-temperature steam (refrigerant gas) returning to the compressor 1 from carrying too many droplets, and to prevent the liquid refrigerant from entering the cylinder of the compressor 1, thereby effectively preventing the compressor 1 from being hit by liquid. It also has functions such as filtering, oil return, and liquid storage. The indoor fan 10 is arranged adjacent to the indoor heat exchanger 9, and its function is to promote the heat exchange between the indoor air and the indoor heat exchanger 9 and improve the heat exchange efficiency. The outdoor fan 3 is arranged adjacent to the outdoor heat exchanger 4, and its function is to enhance the heat exchange effect of the outdoor heat exchanger 4 by forced convection.

[0038] Based on the above embodiments, in some embodiments, the air conditioning system further includes: The filter drier 5 is located between the outdoor heat exchanger 4 and the first expansion valve 6 , that is, the filter drier 5 is connected between the outdoor heat exchanger 4 and the first expansion valve 6 .

[0039] In this embodiment, the filter drier 5 performs drying and filtering on the refrigerant output from the first expansion valve 6 or the outdoor heat exchanger 4. The filter drier 5 can absorb moisture in the refrigerant, effectively preventing ice blockage and dirt blockage in the system pipeline, so as to ensure the normal operation of the refrigeration system. By arranging the filter drier 5 between the outdoor heat exchanger 4 and the first expansion valve 6, it can be ensured that the refrigerant reaches the required dryness and cleanliness before entering the next link of the system, thereby improving the operating efficiency and reliability of the entire air-conditioning system.

[0040] Based on the above embodiment, in some embodiments, the air conditioning system further includes a third expansion valve 13, wherein: One end of the third expansion valve 13 is connected between the filter drier 5 and the first expansion valve 6 , and the other end of the third expansion valve 13 is connected between the first passage 801 and the second expansion valve 7 .

[0041] In this embodiment, the function of the third expansion valve 13 is to throttle, cool and reduce the pressure of the refrigerant output by the outdoor heat exchanger 4, and then input the treated refrigerant into the first channel 801 of the battery heat dissipation heat exchanger 8. This process is the key link when the system is only in the battery heat dissipation mode. Through the throttling effect of the third expansion valve 13, the refrigerant is converted into a low-temperature and low-pressure state before entering the first channel 801, and then heat is exchanged with the coolant in the second channel 802 inside the first channel 801, and evaporates into a low-temperature and low-pressure gas after absorbing heat. Finally, these gaseous refrigerants enter the air intake 101 and finally enter the compressor 1 for the next cycle, thereby realizing heat dissipation of the battery when the system is only in the battery heat dissipation mode.

[0042] Based on the above embodiments, in some embodiments, the air conditioning system further includes a water pump 14, wherein: One end of the water pump 14 is connected to one end of the second channel 802, and the other end is used to connect to the water inlet of the battery unit 15, and the water outlet of the battery unit 15 is used to connect to the first end 1201 of the three-way valve 12; The second end 1202 of the three-way valve 12 is connected to the water inlet of the defrost coil, the third end 1203 of the three-way valve 12 is connected to the other end of the second channel 802, and the water outlet of the defrost coil is connected between the three-way valve 12 and the second channel 802; Please refer to Figure 2 , is a schematic diagram of the structure of a three-way valve 12 provided in an embodiment of the present invention. Figure 2 As shown, when the three-way valve 12 is opened, the first end 1201 and the second end 1202 are connected, and the first end 1201 and the second end 1203 are not connected; when the three-way valve 12 is closed, the first end 1201 and the second end 1202 are not connected, and the first end 1201 and the third end 1203 are connected.

[0043] In this embodiment, the air conditioning system further integrates a water pump 14 to enhance the heat dissipation function of the battery. A coolant circulation path is established through the three-way valve 12, the water pump 14, the battery unit 15 and the second channel 802.

[0044] When the three-way valve 12 is closed, the water pump 14 is responsible for promoting the battery coolant to circulate between the second channel 802 and the battery cell 15. When the battery generates heat, the coolant in the battery cell 15 absorbs the heat of the battery, the temperature rises, and then flows into the second channel 802 of the battery heat dissipation heat exchanger 8. The high-temperature coolant in the second channel 802 releases heat and the temperature decreases by heat exchange with the refrigerant in the first channel 801. The cooled coolant is then circulated back to the battery cell 15 again through the water pump 14, continuing to absorb heat to achieve effective heat dissipation of the battery.

[0045] When the three-way valve 12 is opened, the water pump 14 pushes the battery coolant to circulate between the second channel 802, the battery cell 15 and the defrost coil. When the battery generates heat, the coolant in the battery cell 15 absorbs the heat of the battery and the temperature rises, and then flows into the defrost coil to release the heat, thereby utilizing the heat generated by the battery to defrost the outdoor heat exchanger 4. The coolant in the defrost coil then enters the second channel 802 of the battery heat dissipation heat exchanger 8, and further exchanges heat with the refrigerant in the first channel 801, releasing heat and reducing the temperature. The cooled coolant then circulates back to the battery through the water pump 14 again, continuing to absorb heat to achieve effective heat dissipation of the battery.

[0046] Through this integrated design, the air-conditioning system of this embodiment can not only recover the heat generated by the battery while heating, thereby improving energy utilization efficiency, but also use the heat generated by the battery to defrost the outdoor heat exchanger 4, further enhancing the heating capacity of the air-conditioning system.

[0047] Based on the above embodiments, in some embodiments, the air conditioning system further includes an expansion water tank 16, wherein: One end of the expansion water tank 16 is connected between the first end 1201 of the three-way valve 12 and the water outlet of the battery unit 15 , and the other end is connected between the second channel 802 and the water pump 14 .

[0048] In this embodiment, the air conditioning system further integrates an expansion water tank 16, which can play a role in buffering and stabilizing the pressure in the coolant circulation system. When the coolant in the battery cell 15 changes in volume due to temperature changes during the circulation process, the expansion water tank 16 provides the necessary space to accommodate these changes. When the coolant expands due to heat, the excess liquid will be guided to the expansion water tank 16, and when the coolant cools and contracts, the liquid in the expansion water tank 16 can flow back to the second channel 802, effectively ensuring the continuity and stability of the coolant circulation.

[0049] In addition, the expansion tank 16 also helps to separate and remove gas in the system. During the circulation of the coolant, gas may be dissolved in the liquid, and these gases can be released and collected in the expansion tank 16, thereby reducing cavitation in the system and improving heat exchange efficiency.

[0050] Through this design, the air conditioning system of this embodiment can not only independently control indoor heating and battery heat dissipation, but also effectively manage the circulation and pressure of the coolant, thereby improving the reliability and stability of the system. The addition of the expansion tank 16 provides a more complete and efficient solution for the thermal management system of new energy vehicles, effectively ensuring that the battery can be properly cooled under various working conditions, thereby extending the service life of the battery and improving the performance of the entire vehicle.

[0051] Please refer to Figure 3 , is a schematic diagram of an air conditioning system provided by an embodiment of the present invention when it is in both air conditioning heating mode and battery cooling mode. Figure 3 As shown: When the air conditioning system is in both the air conditioning heating mode and the battery cooling mode, the low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure steam by the compressor 1, flows through the four-way reversing valve 2 and enters the indoor heat exchanger 9, releases heat through forced convection heat exchange by the indoor fan 10, and condenses into medium-temperature and high-pressure liquid refrigerant, which is then divided into two paths: The refrigerant flows through the first expansion valve 6 and is throttled into a low-temperature and low-pressure gas-liquid two-phase refrigerant. The refrigerant flows through the drying filter 5 and enters the outdoor heat exchanger 4, where it absorbs the heat of the outdoor air and evaporates into a low-temperature and low-pressure gaseous refrigerant. The refrigerant flows through the four-way reversing valve 2 and then enters the gas-liquid separator 11, and enters the compressor 1 from the air intake port 101 for compression. The medium-temperature and high-pressure liquid refrigerant in the other path flows through the second expansion valve 7 and is throttled into a low-temperature and low-pressure gas-liquid two-phase refrigerant. Because the third expansion valve 13 is not opened at this time, this part of the gas-liquid two-phase refrigerant only enters the first channel 801 of the battery heat dissipation heat exchanger 8, absorbs the heat of the coolant and evaporates into a low-temperature and low-pressure gaseous refrigerant, and then enters the compressor 1 through the air intake port 101 for compression.

[0052] The battery coolant is powered by the water pump 14. After the coolant in the battery cell 15 absorbs the heat of the battery, it reaches the defrost coil through the three-way valve 12 and releases heat through the outdoor fan 3 for forced convection heat exchange for defrosting the outdoor heat exchanger 4. After the temperature drops, it enters the battery heat dissipation heat exchanger 8. If the water temperature is high at this time, the second expansion valve 7 is opened, and the coolant continues to dissipate heat through the battery heat dissipation heat exchanger 8. After the temperature drops again, it returns to the battery cell 15 to absorb heat. This cycle repeats to achieve the battery heat dissipation and outdoor heat exchanger 4 defrosting functions. When the coolant expands due to heat, the excess liquid will be guided to the expansion water tank 16, and when the coolant contracts due to cooling, the liquid in the expansion water tank 16 will flow back to the second channel 802, effectively ensuring the continuity and stability of the coolant circulation.

[0053] Please refer to Figure 4 , is a schematic diagram of an air conditioning system provided by an embodiment of the present invention when it is only in a battery cooling mode. Figure 4 As shown: When the air-conditioning system is only in the battery heat dissipation mode, the low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure steam by the compressor 1, flows through the four-way reversing valve 2 and enters the outdoor heat exchanger 4, releases heat through forced convection heat exchange by the outdoor fan 3, and condenses into medium-temperature and high-pressure liquid refrigerant. At this time, the first expansion valve 6 and the second expansion valve 7 are in a closed state, so the medium-temperature and high-pressure liquid refrigerant flows through the drying filter 5 and enters the third expansion valve 13 to be throttled into a low-temperature and low-pressure gas-liquid two-phase refrigerant, enters the first channel 801 of the battery heat dissipation heat exchanger 8, absorbs the heat of the coolant in the second channel 802, and evaporates into a low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant enters the compressor 1 from the air intake 101 for compression.

[0054] The battery heat dissipation process when the air-conditioning system is only in the battery heat dissipation mode can refer to the battery heat dissipation process when the air-conditioning system is in both the air-conditioning heating mode and the battery heat dissipation mode, which will not be repeated here.

[0055] Please refer to Figure 5 , is a schematic diagram of an air conditioning system provided by an embodiment of the present invention when it is only in the air conditioning heating mode. Figure 5 As shown: When the air-conditioning system is only in the air-conditioning heating mode, the low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure steam by the compressor 1, flows through the four-way reversing valve 2 and enters the indoor heat exchanger 9, releases heat through forced convection heat exchange by the indoor fan 10, and condenses into medium-temperature and high-pressure liquid refrigerant. At this time, the second expansion valve 7 and the third expansion valve 13 are in a closed state, so the medium-temperature and high-pressure liquid refrigerant flows through the first expansion valve 6 and is throttled into a low-temperature and low-pressure gas-liquid two-phase refrigerant, flows through the drying filter 5 and enters the outdoor heat exchanger 4, absorbs the heat of the outdoor air and evaporates into a low-temperature and low-pressure gaseous refrigerant, and then flows through the four-way reversing valve 2 and enters the gas-liquid separator 11, and enters the compressor 1 from the air intake 101 for compression.

[0056] At this time, the battery cooling system does not work and the water pump 14 is in a closed state.

[0057] Based on the above technical solution, the air conditioning system provided by the present invention realizes the dual functions of indoor heating and battery heat dissipation by integrating a compressor 1, an outdoor heat exchanger 4, an indoor heat exchanger 9, a battery heat dissipation heat exchanger 8, a first expansion valve 6, a second expansion valve 7, a defrost coil and a three-way valve 12. In the heating mode, the heat generated by the battery is recovered and used for air conditioning heating through the first channel 801 and the second channel 802 that can exchange heat with each other, so that the system can effectively dissipate heat from the battery while heating the room, greatly improving the heating capacity of the air conditioner. At the same time, through the integrated design of the defrost coil and the outdoor heat exchanger 4, the system is allowed to guide the high-temperature coolant of the battery unit 15 to the defrost coil through the three-way valve 12 when necessary, and use the heat generated by the battery to defrost the outdoor heat exchanger 4. This design not only improves the defrosting efficiency, but also reduces the degradation of heat exchange performance caused by frosting, and further improves the heating capacity of the air conditioning system. This design simplifies the system structure, reduces energy consumption, and improves the thermal management efficiency and reliability of the whole vehicle.

[0058] It is understandable that the air conditioning system may further include a controller, a pressure sensor, and a temperature sensor to better control the operation of the air conditioning. Regarding the configuration of the controller, the pressure sensor, and the temperature sensor, reference may be made to the existing air conditioning technology, which will not be described in detail here.

[0059] Please refer to Figure 6 , is a flow chart of a control method of an air conditioning system provided by an embodiment of the present invention, comprising the following steps: Step S01, obtaining the operation mode and operation parameters of the air conditioning system.

[0060] In this embodiment, the air conditioning system can monitor the operating mode and operating parameters of the system in real time by integrating the detection module. For example, the operating mode may include the air conditioning heating mode and the battery cooling mode, and the operating parameters may include the indoor set temperature, the indoor temperature and the battery set temperature, the first water outlet temperature of the defrost coil, and the second water outlet temperature of the battery unit 15.

[0061] Step S02, when the operation mode is the indoor heating mode and the battery cooling mode, the four-way reversing valve 2 is controlled to be in the first state, and the battery set temperature is determined according to the operation parameters.

[0062] In this embodiment, when the operation mode of the air conditioning system is set to the indoor heating mode and the battery cooling mode, the system will automatically control the four-way reversing valve 2 to be in the first state, so that the first interface 201 and the third interface 203 are connected, and the second interface 202 and the fourth interface 204 are connected. Such control enables the refrigerant to flow according to the needs of the refrigeration cycle when the compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 are in the open state: the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 1 flows into the indoor heat exchanger 9 through the first interface 201 and the third interface 203, releases heat in the indoor heat exchanger 9 and condenses into liquid refrigerant; at the same time, the low-temperature and low-pressure refrigerant throttled by the first expansion valve 6 absorbs heat and evaporates in the outdoor heat exchanger 4, and flows into the air intake 101 of the compressor 1 through the second interface 202 and the fourth interface 204.

[0063] Step S03, detecting the first outlet water temperature of the defrost coil and the second outlet water temperature of the battery unit 15, and determining whether the battery set temperature is less than the second outlet water temperature.

[0064] If yes, execute step S04; if no, execute step S10.

[0065] In this embodiment, by comparing the battery setting temperature with the second water outlet temperature, the system can determine whether the current battery heat dissipation is sufficient. If the second water outlet temperature is higher than the battery setting temperature, it means that more heat dissipation measures are needed to maintain the battery within a safe and efficient operating temperature range. Therefore, if the battery setting temperature is lower than the second water outlet temperature (i.e., the second water outlet temperature is higher), the system will execute step S04 to further check and determine whether the compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 are in an open state.

[0066] On the contrary, if the second outlet water temperature is not higher than the battery set temperature, it indicates that the battery heat dissipation demand is low or has been met. In this case, the system will execute step S10 to evaluate whether it is necessary to end the battery heat dissipation mode.

[0067] This embodiment allows the system to dynamically adjust its operating state based on the actual heat dissipation needs of the battery. By precisely controlling the opening and closing of the heat dissipation components, the system can effectively manage the battery temperature while optimizing energy use and device life. This approach improves the intelligence level of the thermal management system of new energy vehicles, ensuring that the battery can be properly cooled under various operating conditions, thereby improving the performance and reliability of the entire vehicle.

[0068] Step S04, determining whether the compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 are in an open state.

[0069] If yes, execute step S05.

[0070] In this embodiment, the system performs a series of key component status checks, the purpose of which is to confirm whether the heating components in the system are working and continuously providing heat to the vehicle based on the status of these components. If these components are all turned on, step S05 is executed.

[0071] Step S05, controlling the three-way valve 12 and the water pump 14 to be in an open state.

[0072] In this embodiment, when the compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 are in the open state, it proves that the heating components in the system are working and continuously providing heat to the vehicle. At this time, the system controls the three-way valve 12 and the water pump 14 to be in the open state, the purpose of which is to ensure that the high-temperature coolant in the battery unit 15 can be directed to the defrost coil to achieve defrosting of the outdoor heat exchanger 4.

[0073] Step S06, determining whether the first outlet water temperature is greater than the battery set temperature.

[0074] If yes, execute step S07; if no, execute step S08.

[0075] In this embodiment, the system compares the battery set temperature with the first water outlet temperature of the defrost coil, with the purpose of evaluating whether the temperature of the coolant flowing out of the defrost coil is low enough to effectively cool the battery. Subsequent operations are determined by comparing the first water outlet temperature (i.e., the water outlet temperature of the defrost coil) with the battery set temperature.

[0076] If the first water outlet temperature is greater than the battery set temperature, this means that the coolant temperature in the defrost coil is still high and insufficient to effectively cool the battery. In this case, the system needs to take additional measures to reduce the temperature of the coolant. Therefore, step S07 is executed, that is, the second expansion valve 7 is opened, allowing the medium-temperature and high-pressure liquid refrigerant flowing out of the indoor heat exchanger 9 to flow through the second expansion valve 7 and then be throttled into a low-temperature and low-pressure gas-liquid two-phase refrigerant, and enter the first channel 801 of the battery heat dissipation heat exchanger 8, thereby absorbing more heat from the coolant in the battery heat dissipation heat exchanger 8, further reducing the temperature of the coolant to meet the battery heat dissipation requirements.

[0077] If the first outlet water temperature is less than or equal to the battery set temperature, step S08 is directly executed.

[0078] This embodiment can ensure that the battery operates within the optimal temperature range and prevent overheating, thereby extending the battery life and improving the efficiency and reliability of the overall system. In this way, the air conditioning system can flexibly respond to different thermal management requirements, optimize heat distribution, and improve the performance of electric vehicles.

[0079] Step S07, opening the second expansion valve 7.

[0080] Step S08, determining whether the battery setting temperature is greater than or equal to the second water outlet temperature.

[0081] If yes, execute step S09; if no, return to execute step S04 to determine whether the compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 are in the open state.

[0082] In this embodiment, the system compares the battery setting temperature with the second water outlet temperature of the battery unit 15. If the battery setting temperature is greater than or equal to the second water outlet temperature, it means that the coolant in the battery unit 15 has reached or is lower than the required temperature, and the heat dissipation demand of the battery has been met. In this case, the system will execute step S09 to control the water pump 14, the three-way valve 12 and the second expansion valve 7 to be in a closed state.

[0083] If the battery set temperature is lower than the second water outlet temperature, this indicates that the coolant temperature in the battery unit 15 is still higher than the temperature required by the battery and further heat dissipation is required. Therefore, the system will return to step S04 to re-evaluate and ensure that key components such as the compressor 1, the indoor fan 10, the outdoor fan 3 and the first expansion valve 6 are in an appropriate open state to continue effective heat exchange and battery heat dissipation.

[0084] This embodiment allows the air conditioning system to dynamically adjust operation based on real-time temperature data, ensuring that the battery operates within a safe and efficient temperature range while avoiding unnecessary energy waste. In this way, the air conditioning system can intelligently manage battery heat dissipation, improving the performance of the electric vehicle and the service life of the battery.

[0085] Step S09, controlling the water pump 14, the three-way valve 12 and the second expansion valve 7 to be in a closed state.

[0086] Step S010, determining whether the air conditioning system exits the battery cooling mode according to the operation mode.

[0087] If yes, execute step S011; if no, return to execute step S03, detect the first outlet water temperature of the defrost coil and the second outlet water temperature of the battery unit 15, and determine whether the battery set temperature is less than the second outlet water temperature.

[0088] In this embodiment, the system will decide whether to exit the battery cooling mode according to the current operating mode. If necessary, that is, the battery temperature has stabilized within a safe range, or the vehicle's operating mode has changed and active cooling is no longer required, the system will execute step S011 to end the battery cooling mode to save energy.

[0089] If the system determines that the air conditioning system should not exit the battery cooling mode, it will return to step S03, continue to monitor the first outlet water temperature of the defrost coil and the second outlet water temperature of the battery unit 15, and re-evaluate whether the battery set temperature is less than the second outlet water temperature. This cyclic monitoring and evaluation ensures that the battery cooling mode can be flexibly maintained or adjusted according to actual needs to prevent battery overheating, ensure battery performance and life, and optimize the overall energy efficiency of the air conditioning system.

[0090] Step S011, ending the battery heat dissipation mode.

[0091] Based on the above technical solution, this embodiment obtains the operating mode and parameters. When it is detected that indoor heating and battery heat dissipation need to be performed simultaneously, the four-way reversing valve 2 is adjusted to a suitable state to ensure the correct distribution of heat in the system. By real-time monitoring of the outlet water temperature of the defrost coil and the battery unit 15, and comparing it with the battery set temperature, the system can accurately control the opening of the three-way valve 12 and the water pump 14, as well as the opening or closing of the second expansion valve 7, thereby optimizing the utilization and distribution of heat. This embodiment can accurately control the working status of each component according to real-time temperature data to ensure that the indoor heating and battery heat dissipation requirements are met. At the same time, through intelligent adjustment, the system reduces unnecessary energy consumption and improves overall energy efficiency. In addition, real-time monitoring and adjustment can effectively prevent battery overheating and extend battery life.

[0092] Please refer to Figure 7, which is a flow chart of another control method of an air conditioning system provided by an embodiment of the present invention. Based on the above embodiment, in some embodiments, after determining whether the compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 are in the open state, the following can also be performed: Figure 7 Steps shown: Step S11, when the compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 are not in the open state, the four-way reversing valve 2 is controlled to be in the second state.

[0093] In this embodiment, when the compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 are not in the open state, it is proved that the heating component in the system is not working and does not provide heat for the vehicle. At this time, the system controls the four-way reversing valve 2 to be in the second state, achieving conduction between the first interface 201 and the second interface 202, and conduction between the third interface 203 and the fourth interface 204.

[0094] This control method ensures that when the water pump 14, the compressor 1, the outdoor fan 3, and the third expansion valve 13 are in the open state, the flow direction of the refrigerant adapts to the heat dissipation requirements of the battery: the high-temperature and high-pressure gas discharged by the compressor 1 flows into the outdoor heat exchanger 4 through the first interface 201 and the second interface 202, and releases heat and condenses in the outdoor heat exchanger 4.

[0095] Step S12, controlling the water pump 14, the compressor 1, the outdoor fan 3, and the third expansion valve 13 to be in an open state, and controlling the three-way valve 12 to be in a closed state.

[0096] In this embodiment, in order to ensure that the system can fully dissipate battery heat, the system turns on these components to allow the refrigerant to enter the first channel 801 of the battery heat dissipation heat exchanger 8 and absorb the heat of the coolant in the second channel 802 to cool the coolant.

[0097] Step S13, determining whether the battery setting temperature is greater than or equal to the second water outlet temperature.

[0098] If yes, execute step S14; if no, return to execute step S12, control the water pump 14, the compressor 1, the outdoor fan 3, and the third expansion valve 13 to be in the open state, and control the three-way valve 12 to be in the closed state; In this embodiment, the system detects the second outlet water temperature of the battery unit 15 to determine whether the battery has reached or is lower than the preset safe operating temperature. If the battery set temperature is greater than or equal to the second outlet water temperature, it indicates that the battery heat dissipation is sufficient, and the system will execute step S14 to shut down the relevant components to stop the heat dissipation process, thereby avoiding excessive heat dissipation, saving energy and protecting system components.

[0099] On the contrary, if the battery set temperature is lower than the water outlet temperature, it means that the battery still needs more heat dissipation. In this case, the system will return to step S12, continue to keep the water pump 14, the compressor 1, the outdoor fan 3, and the third expansion valve 13 in the open state, and control the three-way valve 12 to be in the closed state to continue the heat dissipation process. This feedback loop ensures that the battery temperature can be effectively controlled to prevent the battery from overheating, thereby extending the battery life and improving the safety and reliability of the vehicle.

[0100] Step S14, controlling the water pump 14, the compressor 1, the outdoor fan 3, and the third expansion valve 13 to be in a closed state.

[0101] Step S15, determining whether the air conditioning system exits the battery cooling mode according to the operation mode.

[0102] If so, execute step S16; when the battery cooling mode is not exited, return to execute step S03, detect the first water outlet temperature of the defrost coil and the second water outlet temperature of the battery unit 15, and determine whether the battery set temperature is less than the second water outlet temperature.

[0103] Step S16, ending the battery heat dissipation mode.

[0104] Based on the above technical solution, this embodiment provides a dynamic and responsive thermal management method, which not only improves energy utilization efficiency, but also helps protect the battery from overheating damage, thereby extending the battery life and improving the reliability of the vehicle. In addition, by precisely controlling the opening and closing of each component, the system can avoid unnecessary energy waste.

[0105] Please refer to Figure 8 , which is a flow chart of another control method of an air conditioning system provided by an embodiment of the present invention. Based on the above embodiments, in some embodiments, when the operation mode is the indoor heating mode and the battery cooling mode, the following can also be performed: Figure 8 Steps shown: Step S21, determining the indoor set temperature according to the operating parameters.

[0106] Step S22, detecting the indoor temperature, and determining whether the indoor set temperature is greater than the indoor temperature.

[0107] If yes, execute step S23; if no, execute step S26.

[0108] In this embodiment, the indoor temperature is monitored in real time and compared with the indoor temperature set by the user, in order to ensure the comfort of the indoor environment and optimize energy use. If the detected indoor temperature is lower than the indoor set temperature, it means that more heat is needed to increase the indoor temperature to meet the user's comfort requirements. In this case, the system will execute step S23 to control the compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 to be in the open state to start or maintain the indoor heating process.

[0109] On the contrary, if the indoor temperature has reached or exceeded the indoor set temperature, this indicates that the indoor temperature is warm enough, or may be overheated. In this case, the system will execute step S26.

[0110] This embodiment provides an automated temperature adjustment mechanism that can intelligently adjust the operating state of the air conditioning system based on the comparison between the actual indoor temperature and the user-set temperature. This not only improves energy efficiency and reduces energy waste, but also ensures the comfort of the indoor environment and improves passenger satisfaction. In this way, the air conditioning system can control the indoor temperature more accurately while taking into account the needs of energy saving and environmental protection.

[0111] Step S23, controlling the compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 to be in an open state.

[0112] Step S24, determining whether the indoor set temperature is less than or equal to the indoor temperature.

[0113] If so, execute step S25; if not, return to execute step S23, control the compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 to be in the open state.

[0114] In this embodiment, when the indoor set temperature is less than or equal to the indoor temperature, it indicates that the indoor heating demand has been met and the system no longer needs additional heating. In this case, the system will execute step S25 to control the compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 to be in a closed state to stop the heating process, save energy and prevent indoor overheating.

[0115] If the indoor set temperature is greater than the indoor temperature, the system will return to step S23, continue to keep the heating component turned on, and continue heating to increase the indoor temperature until the comfort level set by the user is reached.

[0116] Step S25, controlling the compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 to be in a closed state.

[0117] Step S26, when the compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 are in the closed state, it is determined whether the air-conditioning system exits the indoor heating mode according to the operation mode.

[0118] If not, the process returns to step S22 to detect the indoor temperature and determine whether the indoor set temperature is greater than the indoor temperature; If yes, execute step S27.

[0119] In this embodiment, the system checks whether the compressor 1, the indoor fan 10, the outdoor fan 3, and the first expansion valve 6 are all in the off state. If these components are already off, the system will decide whether to end the indoor heating mode according to the current operation mode.

[0120] If the current operation mode is indoor heating mode, the system will return to step S22 to continue monitoring the indoor temperature and compare it with the indoor set temperature to determine whether to restart the heating component. This cycle ensures that the indoor temperature can be continuously monitored and automatically adjusted when necessary to maintain the user's comfort.

[0121] If the current operation mode is no longer the indoor heating mode, step S27 is executed to formally end the indoor heating mode. The reason may be that the user has manually turned off the heating demand. Ending the heating mode can save energy, avoid unnecessary energy consumption, and ensure that the system does not continue to run the heating component when it is not needed.

[0122] Step S27, ending the indoor heating mode.

[0123] Based on the above technical solution, this embodiment allows the system to dynamically adjust the heating output according to the actual indoor temperature demand, thereby improving energy efficiency and passenger comfort. By accurately controlling the opening and closing of the heating components, the system can avoid unnecessary energy waste while ensuring that the indoor temperature remains within the comfortable range set by the user.

[0124] This embodiment provides an electronic device, including a processor and a memory, the memory is used to store at least one instruction, and when the instruction is loaded and executed by the processor, the above-mentioned air-conditioning system control method is implemented. Its execution method and beneficial effects are similar and will not be repeated here.

[0125] An embodiment of the present invention provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned air-conditioning system control method is implemented. Its execution method and beneficial effects are similar and will not be repeated here.

[0126] It should be noted that although the above describes the various steps in a specific order, it does not mean that the various steps must be executed in the above specific order. In fact, some of these steps can be executed concurrently or even in a different order as long as the required functions can be achieved.

[0127] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An air conditioning system, characterized in that: include: Compressor, outdoor heat exchanger, indoor heat exchanger, battery heat dissipation heat exchanger, first expansion valve, second expansion valve, defrost coil, three-way valve; One end of the indoor heat exchanger is connected to the exhaust port of the compressor, and the other end is connected to one end of the outdoor heat exchanger through the first expansion valve, and the other end of the outdoor heat exchanger is connected to the air intake port of the compressor; The battery heat dissipation heat exchanger includes a first channel and a second channel that can exchange heat with each other, one end of the second expansion valve is connected between the indoor heat exchanger and the first expansion valve, and the other end is connected to one end of the first channel, the other end of the first channel is connected to the air intake port of the compressor, and the second channel is used to be connected in series with the battery unit to cool the high-temperature coolant of the battery unit into a low-temperature coolant; The defrost coil is arranged adjacent to the outdoor heat exchanger, and the defrost coil and the outdoor heat exchanger share an outdoor fan; The first end of the three-way valve is used to connect to the battery unit, the second end is connected to the water inlet of the defrost coil, and the third end is connected to the second channel. The water outlet of the defrost coil is connected between the third end and the second channel to output the high-temperature coolant of the battery unit to the defrost coil or the battery heat dissipation heat exchanger.

2. The air conditioning system according to claim 1, characterized in that: The air conditioning system also includes a four-way reversing valve, wherein: The first interface of the four-way reversing valve is connected to the exhaust port of the compressor, the second interface of the four-way reversing valve is connected to the outdoor heat exchanger, the third interface of the four-way reversing valve is connected to the indoor heat exchanger, and the fourth interface of the four-way reversing valve is connected to the suction port of the compressor; When the four-way reversing valve is in the first state, the first interface is connected to the third interface, and the second interface is connected to the fourth interface; when the four-way reversing valve is in the second state, the first interface is connected to the second interface, and the third interface is connected to the fourth interface.

3. The air conditioning system according to claim 2, characterized in that: The air conditioning system further comprises: A gas-liquid separator, located between the fourth interface of the four-way reversing valve and the air intake of the compressor; an indoor fan, disposed adjacent to the indoor heat exchanger, for achieving forced convection heat exchange between the indoor heat exchanger and indoor air; The outdoor fan is arranged adjacent to the outdoor heat exchanger and is used to realize forced convection heat exchange between the outdoor heat exchanger and outdoor air.

4. The air conditioning system according to claim 3, characterized in that: The air conditioning system further comprises: A drying filter is located between the outdoor heat exchanger and the first expansion valve.

5. The air conditioning system according to claim 4, characterized in that: The air conditioning system further comprises a third expansion valve, wherein: One end of the third expansion valve is connected between the drying filter and the first expansion valve, and the other end of the third expansion valve is connected between the first channel and the second expansion valve.

6. The air conditioning system according to claim 1, characterized in that: The air conditioning system also includes a water pump, wherein: One end of the water pump is connected to one end of the second channel, and the other end is used to connect to the water inlet of the battery unit, and the water outlet of the battery unit is used to connect to the first end of the three-way valve; The second end of the three-way valve is connected to the water inlet of the defrost coil, and the third end of the three-way valve is connected to the other end of the second channel; When the three-way valve is opened, the first end is connected to the second end, and the first end is not connected to the third end; when the three-way valve is closed, the first end is not connected to the second end, and the first end is connected to the third end.

7. The air conditioning system according to claim 6, characterized in that: The air conditioning system further comprises an expansion water tank, wherein: One end of the expansion water tank is connected between the first end of the three-way valve and the water outlet of the battery unit, and the other end is connected between the second channel and the water pump.

8. A control method for an air conditioning system, applied to the air conditioning system according to any one of claims 1 to 7, characterized in that: include: Obtaining the operating mode and operating parameters of the air conditioning system; When the operation mode is the indoor heating mode and the battery cooling mode, the four-way reversing valve is controlled to be in a first state, and the battery set temperature is determined according to the operation parameters; Detecting a first outlet water temperature of a defrost coil and a second outlet water temperature of a battery unit, and determining whether the battery set temperature is less than the second outlet water temperature; If yes, determine whether the compressor, indoor fan, outdoor fan, and first expansion valve are in the open state; If it is in the open state, the three-way valve and the water pump are controlled to be in the open state; Determining whether the first water outlet temperature is greater than the battery set temperature; If the first outlet water temperature is greater than the battery set temperature, opening the second expansion valve; If the first water outlet temperature is less than or equal to the battery setting temperature, determining whether the battery setting temperature is greater than or equal to the second water outlet temperature; If the battery set temperature is lower than the second water outlet temperature, the process returns to the step of determining whether the compressor, the indoor fan, the outdoor fan, and the first expansion valve are in an open state; If the battery set temperature is greater than or equal to the second water outlet temperature, the water pump, the three-way valve and the second expansion valve are controlled to be in a closed state; determining whether the air conditioning system exits a battery cooling mode according to the operating mode; If the battery cooling mode is not exited, returning to the step of detecting the first outlet water temperature of the defrost coil and the second outlet water temperature of the battery unit, and determining whether the battery set temperature is less than the second outlet water temperature; If the battery cooling mode is exited, the battery cooling mode will end.

9. The control method according to claim 8, characterized in that: After determining whether the compressor, the indoor fan, the outdoor fan, and the first expansion valve are in an open state, the method further includes: When the compressor, the indoor fan, the outdoor fan, and the first expansion valve are not in an open state, controlling the four-way reversing valve to be in a second state; Controlling the water pump, the compressor, the outdoor fan, and the third expansion valve to be in an open state, and controlling the three-way valve to be in a closed state; Determining whether the battery set temperature is greater than or equal to the second water outlet temperature; If not, return to the step of controlling the water pump, the compressor, the outdoor fan, and the third expansion valve to be in an open state, and controlling the three-way valve to be in a closed state; If yes, control the water pump, the compressor, the outdoor fan, and the third expansion valve to be in a closed state; determining whether the air conditioning system exits a battery cooling mode according to the operating mode; If the battery cooling mode is not exited, returning to the step of detecting the first outlet water temperature of the defrost coil and the second outlet water temperature of the battery unit, and determining whether the battery set temperature is less than the second outlet water temperature; If the battery cooling mode is exited, the battery cooling mode will end.

10. The method according to claim 8, characterized in that When the operation mode is an indoor heating mode and a battery cooling mode, the method further includes: Determining the indoor set temperature according to the operating parameters; Detecting the indoor temperature and determining whether the indoor set temperature is greater than the indoor temperature; If yes, control the compressor, the indoor fan, the outdoor fan, and the first expansion valve to be in an open state; Determining whether the indoor set temperature is less than or equal to the indoor temperature; If the indoor set temperature is less than or equal to the indoor temperature, the compressor, the indoor fan, the outdoor fan, and the first expansion valve are controlled to be in a closed state; When the compressor, the indoor fan, the outdoor fan, and the first expansion valve are in a closed state, judging whether the air conditioning system exits the indoor heating mode according to the operation mode; If the indoor heating mode is not exited, returning to the step of detecting the indoor temperature and determining whether the indoor set temperature is greater than the indoor temperature; If the indoor heating mode is exited, the indoor heating mode is ended.

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