Air conditioning system, control method of air conditioning system

Abstract

The application belongs to the field of air conditioners, and discloses an air conditioning system and a control method of the air conditioning system, the 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 defrosting coil and a three-way valve. The application realizes the dual functions of indoor heating and battery heat dissipation. In the heating mode, the heat generated by the battery is recovered through the first channel and the second channel which can exchange heat with each other and is used for air conditioning heating, so that the system can effectively dissipate heat for the battery while heating indoors. At the same time, through the integrated design of the defrosting coil and the outdoor heat exchanger, the system can guide the high-temperature cooling liquid of the battery unit to the defrosting coil through the three-way valve when needed, and defrost the outdoor heat exchanger by using the heat generated by the battery. This design not only improves the defrosting efficiency, but also reduces the heat exchange performance decline caused by frosting, further improving the heating capacity of the air conditioning system.

Description

Technical Field

[0001] This invention relates to the field of air conditioning, and more specifically, to an air conditioning system and a control method for the air conditioning system. Background Technology

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

[0003] In the process of developing this invention, the inventors discovered that the prior art has at least the following technical problems: Existing automotive air conditioning systems are primarily designed to meet the temperature control needs of the passenger compartment, while insufficiently considering the need for battery heat dissipation. Especially in winter, when the interior needs heating, if the battery also needs heat dissipation, the existing system struggles to meet both needs simultaneously. Furthermore, the outdoor heat exchanger in existing systems is prone to frosting in heating mode, which severely affects heat exchange efficiency and reduces the heating capacity of the air conditioning system.

[0004] Therefore, how to simultaneously meet the heat dissipation requirements of batteries and the heating requirements of air conditioning, and improve the heating capacity of air conditioning systems, is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In order to effectively solve the problems in the existing technology that cannot simultaneously meet the heat dissipation requirements of batteries and the heating requirements of air conditioning, and that the heating capacity of air conditioning systems is poor, the present invention provides an air conditioning system and a control method for the air conditioning system.

[0006] An air conditioning system includes: a compressor, an outdoor heat exchanger, an indoor heat exchanger, a battery heat exchanger, a first expansion valve, a second expansion valve, a defrost coil, and a three-way valve;

[0007] Wherein, 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 intake port of the compressor.

[0008] The battery 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 of the compressor. The second channel is used to connect in series with the battery cell to cool the high-temperature coolant of the battery cell into a low-temperature coolant.

[0009] The defrost coil is arranged adjacent to the outdoor heat exchanger, and the defrost coil and the outdoor heat exchanger share an outdoor fan;

[0010] The first end of the three-way valve is connected to the battery unit, the second end is connected to the inlet of the defrost coil, and the third end is connected to the second channel. The 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 exchanger.

[0011] Optionally, the air conditioning system further includes a four-way reversing valve, wherein:

[0012] The first port of the four-way reversing valve is connected to the exhaust port of the compressor, the second port of the four-way reversing valve is connected to the outdoor heat exchanger, the third port of the four-way reversing valve is connected to the indoor heat exchanger, and the fourth port of the four-way reversing valve is connected to the suction port of the compressor.

[0013] Furthermore, when the four-way reversing valve is in the first state, the first interface and the third interface are connected, and the second interface and the fourth interface are connected; when the four-way reversing valve is in the second state, the first interface and the second interface are connected, and the third interface and the fourth interface are connected.

[0014] Optionally, the air conditioning system further includes:

[0015] A gas-liquid separator is located between the fourth port of the four-way reversing valve and the suction port of the compressor;

[0016] An indoor fan is arranged adjacent to the indoor heat exchanger to achieve forced convection heat exchange between the indoor heat exchanger and the indoor air.

[0017] An outdoor fan is arranged adjacent to the outdoor heat exchanger to achieve forced convection heat exchange between the outdoor heat exchanger and the outdoor air.

[0018] Optionally, the air conditioning system further includes:

[0019] A drying filter is located between the outdoor heat exchanger and the first expansion valve.

[0020] Optionally, the air conditioning system further includes a third expansion valve, wherein:

[0021] One end of the third expansion valve is connected between the dryer filter and the first expansion valve, and the other end is connected between the first channel and the second expansion valve.

[0022] Optionally, the air conditioning system further includes a water pump, wherein:

[0023] 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. The water outlet of the battery unit is used to connect to the first end of the three-way valve.

[0024] The second end of the three-way valve is connected to the water inlet of the defrosting coil, and the third end of the three-way valve is connected to the other end of the second channel.

[0025] Furthermore, when the three-way valve is open, the first end and the second end are connected, but the first end and the third end are not connected; when the three-way valve is closed, the first end and the second end are not connected, but the first end and the third end are connected.

[0026] Optionally, the air conditioning system further includes an expansion tank, wherein:

[0027] One end of the expansion tank is connected between the first end of the three-way valve and the outlet of the battery unit, and the other end is connected between the second channel and the water pump.

[0028] A control method for an air conditioning system, applied to an air conditioning system as described in any of the above claims, comprising:

[0029] Obtain the operating mode and operating parameters of the air conditioning system;

[0030] When the operating mode is indoor heating mode and battery cooling mode, the four-way reversing valve is controlled to be in the first state, and the battery set temperature is determined according to the operating parameters.

[0031] The first outlet water temperature of the defrosting coil and the second outlet water temperature of the battery unit are detected, and it is determined whether the set temperature of the battery is lower than the second outlet water temperature.

[0032] If so, determine whether the compressor, indoor fan, outdoor fan, and first expansion valve are in the open state;

[0033] If it is in the open state, it controls the three-way valve and water pump to be in the open state;

[0034] Determine whether the temperature of the first outlet water is greater than the set temperature of the battery;

[0035] If the temperature of the first outlet water is greater than the set temperature of the battery, then the second expansion valve is opened;

[0036] If the first outlet water temperature is less than or equal to the battery set temperature, then determine whether the battery set temperature is greater than or equal to the second outlet water temperature;

[0037] If the battery set temperature is lower than the second outlet water temperature, then return to the step of determining whether the compressor, indoor fan, outdoor fan, and first expansion valve are in the open state;

[0038] If the battery set temperature is greater than or equal to the second outlet water temperature, then the water pump, the three-way valve, and the second expansion valve are controlled to be in the closed state;

[0039] Determine whether the air conditioning system has exited the battery cooling mode based on the operating mode;

[0040] If the battery cooling mode is not exited, the process returns to the steps of detecting the first outlet water temperature of the defrosting coil and the second outlet water temperature of the battery unit, and determining whether the battery set temperature is lower than the second outlet water temperature.

[0041] If you exit battery cooling mode, the battery cooling mode will end.

[0042] Optionally, after determining whether the compressor, indoor fan, outdoor fan, and first expansion valve are in the open state, the method further includes:

[0043] When the compressor, the indoor fan, the outdoor fan, and the first expansion valve are not in the open state, the four-way reversing valve is controlled to be in the second state;

[0044] The water pump, the compressor, the outdoor fan, and the third expansion valve are controlled to be in the open state, and the three-way valve is controlled to be in the closed state.

[0045] Determine whether the battery set temperature is greater than or equal to the second outlet water temperature;

[0046] If not, return to the step of controlling the water pump, the compressor, the outdoor fan, and the third expansion valve to be in the open state, and controlling the three-way valve to be in the closed state;

[0047] If so, then the water pump, the compressor, the outdoor fan, and the third expansion valve are controlled to be in the closed state;

[0048] Determine whether the air conditioning system has exited the battery cooling mode based on the operating mode;

[0049] If the battery cooling mode is not exited, the process returns to the steps of detecting the first outlet water temperature of the defrosting coil and the second outlet water temperature of the battery unit, and determining whether the battery set temperature is lower than the second outlet water temperature.

[0050] If you exit battery cooling mode, the battery cooling mode will end.

[0051] Optionally, when the operating mode is indoor heating mode and battery cooling mode, the method further includes:

[0052] Determine the indoor set temperature based on the aforementioned operating parameters;

[0053] Detect the indoor temperature and determine whether the set indoor temperature is greater than the indoor temperature.

[0054] If so, then the compressor, the indoor fan, the outdoor fan, and the first expansion valve are controlled to be in the open state;

[0055] Determine whether the set indoor temperature is less than or equal to the indoor temperature;

[0056] If the indoor set temperature is less than or equal to the indoor temperature, then the compressor, the indoor fan, the outdoor fan, and the first expansion valve are controlled to be in the closed state.

[0057] When the compressor, the indoor fan, the outdoor fan, and the first expansion valve are in the closed state, it is determined whether the air conditioning system should exit the indoor heating mode according to the operating mode;

[0058] If the indoor heating mode is not exited, return to the step of detecting the indoor temperature and determining whether the indoor set temperature is greater than the indoor temperature.

[0059] If you exit the indoor heating mode, the indoor heating mode will end.

[0060] The air conditioning system provided in this embodiment of the invention has at least the following beneficial effects:

[0061] The air conditioning system provided by this invention integrates a compressor, an outdoor heat exchanger, an indoor heat exchanger, a battery heat exchanger, a first expansion valve, a second expansion valve, a defrost coil, and a three-way valve, achieving dual functions of indoor heating and battery cooling. In heating mode, the system recovers heat generated by the battery through the mutually exchanging first and second channels and uses this heat for air conditioning heating. This allows the system to effectively dissipate heat from the battery while providing indoor heating, significantly improving the heating capacity of the air conditioner. Simultaneously, the integrated design of the defrost coil and the outdoor heat exchanger allows the system to guide the high-temperature coolant from the battery cells to the defrost coil via the three-way valve when needed, utilizing the heat generated by the battery to defrost the outdoor heat exchanger. This design not only improves defrosting efficiency but also reduces the decrease in heat exchange performance caused by frost, further enhancing the heating capacity of the air conditioning system. This design simplifies the system structure, reduces energy consumption, and improves the overall vehicle's thermal management efficiency and reliability.

[0062] In summary, the present invention can effectively improve the problems existing in the prior art that cannot simultaneously meet the heat dissipation requirements of batteries and the heating requirements of air conditioning, and that the heating capacity of the air conditioning system is poor. Attached Figure Description

[0063] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0064] Figure 1 This is a schematic diagram of the structure of an air conditioning system provided in an embodiment of the present invention;

[0065] Figure 2 This is a schematic diagram of the structure of a three-way valve 12 provided in an embodiment of the present invention;

[0066] Figure 3 A schematic diagram of an air conditioning system simultaneously operating in air conditioning heating mode and battery cooling mode, provided in an embodiment of the present invention.

[0067] Figure 4 This is a schematic diagram of an air conditioning system in battery cooling mode, provided by an embodiment of the present invention.

[0068] Figure 5 This is a schematic diagram of an air conditioning system in heating mode, as provided in an embodiment of the present invention.

[0069] Figure 6 A flowchart illustrating a control method for an air conditioning system provided in an embodiment of the present invention;

[0070] Figure 7 A flowchart illustrating another control method for an air conditioning system provided in an embodiment of the present invention;

[0071] Figure 8 A flowchart illustrating another control method for an air conditioning system provided in an embodiment of the present invention.

[0072] Explanation of reference numerals in the attached figures:

[0073] 1. Compressor, 101. Inlet, 102. Outlet, 2. Four-way reversing valve, 201. First port, 202. Second port, 203. Third port, 204. Fourth port, 3. Outdoor fan, 4. Outdoor heat exchanger, 5. Dryer filter, 6. First expansion valve, 7. Second expansion valve, 8. Battery 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 tank. Detailed Implementation

[0074] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0075] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0076] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0077] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0078] Please refer to Figure 1 This is a schematic diagram of an air conditioning system provided in an embodiment of the present invention. This air conditioning system can be applied to new energy vehicles, which may include electric buses, electric logistics vehicles, electric trucks, and electric engineering vehicles. Figure 1 As shown, the air conditioning system includes:

[0079] Compressor 1, outdoor heat exchanger 4, indoor heat exchanger 9, battery heat exchanger 8, first expansion valve 6, second expansion valve 7, defrost coil, three-way valve 12;

[0080] 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. The other end of the outdoor heat exchanger 4 is connected to the suction port 101 of the compressor 1.

[0081] The battery 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 suction port 101 of the compressor 1. The second channel 802 is used to connect in series with the battery unit 15 to cool the high-temperature coolant of the battery unit 15 into a low-temperature coolant.

[0082] The defrost coil is arranged adjacent to the outdoor heat exchanger 4, that is, the defrost coil is located 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, so as to output the high-temperature coolant of the battery unit 15 to the defrost coil or the battery heat exchanger 8. Specifically, the first end 1201 of the three-way valve 12 is connected to the outlet of the battery unit 15, the second end 1202 of the three-way valve 12 is connected to the inlet of the defrost coil, the third end 1203 of the three-way valve 12 is connected to the inlet of the second channel 802, the outlet of the second channel 802 is connected to the inlet of the battery unit 15, and the 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 closed. The high-temperature coolant from the battery unit 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 equipment investment costs. Furthermore, the defrost coil and the outdoor heat exchanger 4 can be integrated into one unit to further reduce space occupation and improve space utilization. Of course, the defrost coil and the outdoor heat exchanger 4 can also be set separately to facilitate maintenance.

[0083] It is understood that battery cell 15 may include a battery and a battery heat exchange structure that exchanges heat with the battery. Coolant can circulate within this heat exchange structure. Thus, low-temperature coolant flows into the heat exchange structure, absorbs heat from the battery, and converts it into high-temperature coolant. The high-temperature coolant flows through the second channel 802 of the battery heat exchanger 8, exchanging heat with the low-temperature refrigerant in the first channel 801, transferring the heat carried by the coolant to the refrigerant, thereby obtaining low-temperature coolant. The low-temperature coolant then flows back to the battery heat exchange structure, and this cycle continues to meet the battery's heat dissipation requirements. It should be noted that the battery in battery cell 15 can be the battery of a new energy vehicle.

[0084] 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. The other end of the outdoor heat exchanger 4 is connected to the suction port 101 of the compressor 1, thus forming a highly efficient heat exchange and refrigerant circulation system.

[0085] When compressor 1 operates, it draws in refrigerant through suction port 101. The cylinder compresses the refrigerant into a high-temperature, high-pressure gas, which is then sent to the indoor heat exchanger 9 through discharge port 102. Here, the refrigerant exchanges heat with the indoor air through the indoor heat exchanger 9, releasing heat and warming the air inside the vehicle. Subsequently, the refrigerant passes through the first expansion valve 6, where it is throttled and depressurized, becoming a low-temperature, 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 heat from the outside air, evaporates into a gaseous state, and then returns to the suction port 101 of compressor 1 through the other end of the outdoor heat exchanger 4.

[0086] In this embodiment, a circuit capable of independently controlling battery heat dissipation is constructed by connecting one end of the second expansion valve 7 between the indoor heat exchanger 9 and the first expansion valve 6, and the other end to one end of the first channel 801. The other end of the first channel 801 is connected to the suction port 101 of the compressor 1. When the battery heat exchanger 8 needs to operate, the medium-temperature, high-pressure liquid refrigerant flows out from the indoor heat exchanger 9, is throttled by the second expansion valve 7, and transforms into a low-temperature, low-pressure gas-liquid two-phase state. This transformation allows the refrigerant to more effectively absorb the heat generated by the battery when it enters 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 cell 15, thereby achieving battery heat dissipation.

[0087] During the heat exchange process, the coolant in battery cell 15 releases heat to the refrigerant, lowering its own temperature. It then circulates back to battery cell 15 to continue absorbing heat, maintaining the battery within a safe operating temperature range. After heat exchange, the refrigerant's temperature rises, and it enters the suction port 101 of compressor 1 through the other end of the first channel 801, ready for the next cycle.

[0088] In this embodiment, the defrost coil is arranged adjacent to the outdoor heat exchanger 4, and a three-way valve 12 is connected to the defrost coil, the second channel 802 and the battery unit 15 respectively, so as to output the high-temperature coolant of the battery unit 15 to the defrost coil or the battery heat exchanger 8.

[0089] By installing a defrost coil next to the outdoor heat exchanger 4 and configuring a three-way valve 12 to direct the high-temperature coolant from the battery cell 15 to the defrost coil or the battery heat exchanger 8, the air conditioning system of this invention can efficiently utilize the heat generated by the battery during discharge. This design allows the three-way valve 12 to direct the high-temperature coolant from the battery cell 15 to the defrost coil when frost forms on the surface of the outdoor heat exchanger 4 in cold climates, utilizing its heat for defrosting and thus maintaining the high-efficiency heat exchange performance of the outdoor heat exchanger 4. Simultaneously, when defrosting is not required, the three-way valve 12 can directly guide the high-temperature coolant to the battery heat exchanger 8, achieving effective heat dissipation of the battery, ensuring the battery operates within its optimal temperature range, and extending its service life. This thermal 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 climatic conditions.

[0090] Based on the above embodiments, in some embodiments, the air conditioning system further includes a four-way reversing valve 2, wherein:

[0091] The first port 201 of the four-way reversing valve 2 is connected to the exhaust port 102 of the compressor 1, the second port 202 of the four-way reversing valve 2 is connected to the outdoor heat exchanger 4, the third port 203 of the four-way reversing valve 2 is connected to the indoor heat exchanger 9, and the fourth port 204 of the four-way reversing valve 2 is connected to the suction port 101 of the compressor 1.

[0092] When the four-way directional valve 2 is in the first state, the first port 201 and the third port 203 are connected, and the second port 202 and the fourth port 204 are connected; when the four-way directional valve 2 is in the second state, the first port 201 and the second port 202 are connected, and the third port 203 and the fourth port 204 are connected.

[0093] In this embodiment, the four-way reversing valve 2 is designed with four ports. The first port 201 is connected to the exhaust port 102 of the compressor 1 to ensure that the high-temperature, high-pressure gaseous refrigerant discharged by the compressor 1 can enter the outdoor heat exchanger 4 or the indoor heat exchanger 9 for condensation. The second port 202 is connected to the outdoor heat exchanger 4 to ensure that the high-temperature, high-pressure gaseous refrigerant discharged by the compressor 1 can flow into the outdoor heat exchanger 4 for condensation when the system is only in battery cooling mode. It is also used to ensure that when the system is only in air conditioning heating mode, or simultaneously in air conditioning heating mode and battery cooling mode, the low-temperature gaseous refrigerant discharged by the compressor 1 can flow into the outdoor heat exchanger 4 for condensation. The low-temperature, low-pressure gaseous refrigerant can return to the compressor 1; the third interface 203 is connected to the indoor heat exchanger 9 to ensure that when the system is only in air conditioning heating mode, or in both air conditioning heating mode and battery cooling mode, the high-temperature, high-pressure gaseous refrigerant discharged by the compressor 1 in heating mode can flow into the indoor heat exchanger 9 for condensation. In addition, it is used to ensure that when the air conditioning system is in cooling mode, the low-temperature, 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 suction port 101 of the compressor 1 to ensure that the low-temperature, low-pressure gaseous refrigerant can smoothly return to the compressor 1 for the next cycle.

[0094] In the first state, the first port 201 and the third port 203 of the four-way reversing valve 2 are connected, allowing the high-temperature, high-pressure refrigerant to flow to the indoor heat exchanger 9 for condensation. Simultaneously, the second port 202 and the fourth port 204 are connected, allowing the refrigerant that has passed through the outdoor heat exchanger 4 to flow back to the compressor 1. In the second state, the first port 201 and the second port 202 of the four-way reversing valve 2 are connected, allowing the high-temperature, high-pressure refrigerant to flow to the outdoor heat exchanger 4 for condensation. Simultaneously, the third port 203 and the fourth port 204 are connected, allowing the refrigerant that has passed through the indoor heat exchanger 9 to flow back to the compressor 1.

[0095] Based on the above embodiments, in some embodiments, the air conditioning system further includes:

[0096] The gas-liquid separator 11 is located between the fourth port 204 of the four-way reversing valve 2 and the suction port 101 of the compressor 1, that is, the gas-liquid separator 11 is connected between the fourth port 204 and the suction port 101.

[0097] An indoor fan 10 is arranged adjacent to an indoor heat exchanger 9, for example, on the air outlet side or air inlet side of the indoor heat exchanger 9, to achieve forced convection heat exchange between the indoor heat exchanger 9 and the indoor air.

[0098] The outdoor fan 3 is arranged adjacent to the outdoor heat exchanger 4, for example, on the air outlet side or air inlet side of the outdoor heat exchanger 4, to achieve forced convection heat exchange between the outdoor heat exchanger 4 and the outdoor air.

[0099] In this embodiment, the gas-liquid separator 11 is located between the fourth port 204 of the four-way reversing valve 2 and the suction port 101 of the compressor 1. Its main function is to prevent the low-pressure, low-temperature vapor (refrigerant gas) returning to the compressor 1 from carrying excessive liquid droplets, thus preventing liquid refrigerant from entering the cylinder of the compressor 1 and effectively preventing liquid slugging of the compressor 1. It also has functions such as filtration, oil return, and liquid storage. The indoor fan 10 is arranged adjacent to the indoor heat exchanger 9, and its function is to promote heat exchange between the indoor air and the indoor heat exchanger 9, thereby improving 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 through forced convection.

[0100] Based on the above embodiments, in some embodiments, the air conditioning system further includes:

[0101] The dryer filter 5 is located between the outdoor heat exchanger 4 and the first expansion valve 6, that is, the dryer filter 5 is connected between the outdoor heat exchanger 4 and the first expansion valve 6.

[0102] In this embodiment, the dryer filter 5 dries and filters the refrigerant output from the first expansion valve 6 or the outdoor heat exchanger 4. The dryer filter 5 absorbs moisture from the refrigerant, effectively preventing ice blockage and dirt blockage in the system pipelines, thus ensuring the normal operation of the refrigeration system. By installing the dryer filter 5 between the outdoor heat exchanger 4 and the first expansion valve 6, it is ensured that the refrigerant reaches the required dryness and cleanliness before entering the next stage of the system, thereby improving the operating efficiency and reliability of the entire air conditioning system.

[0103] Based on the above embodiments, in some embodiments, the air conditioning system further includes a third expansion valve 13, wherein:

[0104] One end of the third expansion valve 13 is connected between the dryer filter 5 and the first expansion valve 6, and the other end is connected between the first channel 801 and the second expansion valve 7.

[0105] In this embodiment, the third expansion valve 13 throttles and cools the refrigerant output from the outdoor heat exchanger 4, then inputs the treated refrigerant into the first channel 801 of the battery heat exchanger 8. This process is crucial when the system is in battery cooling mode only. Through the throttling effect of the third expansion valve 13, the refrigerant is converted to a low-temperature, low-pressure state before entering the first channel 801. It then exchanges heat with the coolant in the second channel 802 inside the first channel 801, absorbing heat and evaporating into a low-temperature, low-pressure gaseous state. Finally, this gaseous refrigerant enters the suction port 101 and then enters the compressor 1 for the next cycle, thus achieving battery cooling when the system is in battery cooling mode only.

[0106] Based on the above embodiments, in some embodiments, the air conditioning system further includes a water pump 14, wherein:

[0107] 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. The water outlet of the battery unit 15 is used to connect to the first end 1201 of the three-way valve 12.

[0108] The second end 1202 of the three-way valve 12 is connected to the inlet of the defrosting coil, the third end 1203 of the three-way valve 12 is connected to the other end of the second channel 802, and the outlet of the defrosting coil is connected between the three-way valve 12 and the second channel 802.

[0109] Please refer to Figure 2 This 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 open, the first end 1201 and the second end 1202 are connected, while 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, while the first end 1201 and the third end 1203 are connected.

[0110] In this embodiment, the air conditioning system further integrates a water pump 14 to enhance battery heat dissipation. A coolant circulation path is established through the three-way valve 12, water pump 14, battery unit 15, and second channel 802.

[0111] When the three-way valve 12 is closed, the water pump 14 drives 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, its temperature rises, and then it flows into the second channel 802 of the battery heat exchanger 8. The high-temperature coolant in the second channel 802 releases heat and its temperature drops by exchanging heat with the refrigerant in the first channel 801. The cooled coolant is then circulated back to the battery cell 15 by the water pump 14 to continue absorbing heat, achieving effective heat dissipation for the battery.

[0112] 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 and its temperature rises. It then flows into the defrost coil to release the heat, thus using 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 exchanger 8, where it undergoes further heat exchange with the refrigerant in the first channel 801, releasing heat and lowering its temperature. The cooled coolant is then circulated back to the battery by the water pump 14 to continue absorbing heat, achieving effective heat dissipation for the battery.

[0113] Through this integrated design, the air conditioning system in this embodiment can not only recover the heat generated by the battery while heating, thus improving energy 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.

[0114] Based on the above embodiments, in some embodiments, the air conditioning system further includes an expansion tank 16, wherein:

[0115] One end of the expansion tank 16 is connected between the first end 1201 of the three-way valve 12 and the outlet of the battery unit 15, and the other end is connected between the second channel 802 and the water pump 14.

[0116] In this embodiment, the air conditioning system further integrates an expansion tank 16, which acts as a buffer and stabilizes pressure in the coolant circulation system. When the coolant in the battery cell 15 undergoes volume changes due to temperature variations during circulation, the expansion tank 16 provides the necessary space to accommodate these changes. When the coolant expands due to heat, excess liquid is guided into the expansion tank 16, and when the coolant contracts due to cooling, the liquid in the expansion tank 16 can flow back to the second channel 802, effectively ensuring the continuity and stability of the coolant circulation.

[0117] In addition, the expansion tank 16 also helps with the separation and removal of gases in the system. During the coolant circulation process, gases may dissolve in the liquid. These gases can be released and collected in the expansion tank 16, thereby reducing cavitation in the system and improving heat exchange efficiency.

[0118] Through this design, the air conditioning system in this embodiment can not only independently control indoor heating and battery heat dissipation, but also effectively manage the circulation and pressure of the coolant, improving the system's reliability and stability. 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 receives appropriate heat dissipation under various operating conditions, thereby extending battery life and improving overall vehicle performance.

[0119] Please refer to Figure 3 This is a schematic diagram of an air conditioning system simultaneously operating in air conditioning heating mode and battery cooling mode, according to an embodiment of the present invention. Figure 3 As shown:

[0120] When the air conditioning system is simultaneously in heating mode and battery cooling mode, the low-temperature, low-pressure gaseous refrigerant is compressed into high-temperature, high-pressure vapor by compressor 1. After flowing through the four-way reversing valve 2, it enters the indoor heat exchanger 9, where it releases heat through forced convection heat exchange by the indoor fan 10. It then condenses into medium-temperature, high-pressure liquid refrigerant, which is then divided into two paths:

[0121] The refrigerant flows through the first expansion valve 6 and is throttled into a low-temperature, low-pressure gas-liquid two-phase refrigerant. After passing through the dryer filter 5, it enters the outdoor heat exchanger 4, where it absorbs heat from the outdoor air and evaporates into a low-temperature, low-pressure gaseous refrigerant. After passing through the four-way reversing valve 2, it enters the gas-liquid separator 11 and enters the compressor 1 from the suction port 101 for compression.

[0122] The other medium-temperature, high-pressure liquid refrigerant flows through the second expansion valve 7 and is throttled into a low-temperature, low-pressure gas-liquid two-phase refrigerant. Since the third expansion valve 13 is not open at this time, this part of the gas-liquid two-phase refrigerant only enters the first channel 801 of the battery heat exchanger 8, absorbs the heat of the coolant, evaporates into a low-temperature, low-pressure gaseous refrigerant, and then enters the compressor 1 through the suction port 101 for compression.

[0123] The battery coolant is powered by water pump 14. The coolant in the battery cell 15 absorbs heat from the battery and then passes through three-way valve 12 to the defrost coil. Forced convection by the outdoor fan 3 releases heat for defrosting the outdoor heat exchanger 4. After the temperature drops, it enters the battery heat exchanger 8. If the water temperature is high at this point, the second expansion valve 7 opens, and the coolant continues to dissipate heat through the battery heat exchanger 8. After the temperature drops again, it returns to the battery cell 15 to absorb heat, thus completing the cycle and achieving both battery cooling and defrosting functions of the outdoor heat exchanger 4. When the coolant expands due to heat, excess liquid is guided to the expansion tank 16. When the coolant contracts due to cooling, the liquid in the expansion tank 16 flows back to the second channel 802, effectively ensuring the continuity and stability of the coolant circulation.

[0124] Please refer to Figure 4 This is a schematic diagram of an air conditioning system in battery cooling mode, as provided in an embodiment of the present invention. Figure 4 As shown:

[0125] When the air conditioning system is only in battery cooling mode, the low-temperature, low-pressure gaseous refrigerant is compressed into high-temperature, high-pressure vapor by the compressor 1. After flowing through the four-way reversing valve 2, it enters the outdoor heat exchanger 4. Through forced convection heat exchange by the outdoor fan 3, it releases heat and condenses into medium-temperature, high-pressure liquid refrigerant. At this time, the first expansion valve 6 and the second expansion valve 7 are in the closed state. Therefore, the medium-temperature, high-pressure liquid refrigerant flows through the dryer filter 5 and enters the third expansion valve 13, which throttles it into a low-temperature, low-pressure gas-liquid two-phase refrigerant. It enters the first channel 801 of the battery cooling heat exchanger 8, absorbs the heat of the coolant in the second channel 802, and evaporates into a low-temperature, low-pressure gaseous refrigerant. This low-temperature, low-pressure gaseous refrigerant enters the compressor 1 from the suction port 101 for compression.

[0126] The battery cooling process when the air conditioning system is only in battery cooling mode can be referred to as the battery cooling process when the air conditioning system is simultaneously in air conditioning heating mode and battery cooling mode, and will not be repeated here.

[0127] Please refer to Figure 5 This is a schematic diagram of an air conditioning system in heating mode, as provided in an embodiment of the present invention. Figure 5 As shown:

[0128] When the air conditioning system is only in heating mode, the low-temperature, low-pressure gaseous refrigerant is compressed into high-temperature, high-pressure vapor by the compressor 1. After flowing through the four-way reversing valve 2, it enters the indoor heat exchanger 9. Through forced convection heat exchange by the indoor fan 10, it releases heat and condenses into medium-temperature, high-pressure liquid refrigerant. At this time, the second expansion valve 7 and the third expansion valve 13 are in the closed state. Therefore, the medium-temperature, high-pressure liquid refrigerant flows through the first expansion valve 6 and is throttled into a low-temperature, low-pressure gas-liquid two-phase refrigerant. After flowing through the dryer filter 5, it enters the outdoor heat exchanger 4, absorbs heat from the outdoor air, evaporates into a low-temperature, low-pressure gaseous refrigerant, and then flows through the four-way reversing valve 2 before entering the gas-liquid separator 11. It then enters the compressor 1 from the suction port 101 for compression.

[0129] At this time, the battery cooling system is not working, and the water pump 14 is in the off state.

[0130] Based on the above technical solution, the air conditioning system provided by this invention integrates a compressor 1, an outdoor heat exchanger 4, an indoor heat exchanger 9, a battery heat exchanger 8, a first expansion valve 6, a second expansion valve 7, a defrost coil, and a three-way valve 12, achieving the dual functions of indoor heating and battery cooling. In heating mode, the heat generated by the battery is recovered through the mutually heat-exchanging first channel 801 and second channel 802 and used for air conditioning heating, enabling the system to effectively dissipate heat from the battery while providing indoor heating, greatly improving the heating capacity of the air conditioner. Simultaneously, the integrated design of the defrost coil and the outdoor heat exchanger 4 allows the system to guide the high-temperature coolant from the battery unit 15 to the defrost coil via the three-way valve 12 when needed, utilizing the heat generated by the battery to defrost the outdoor heat exchanger 4. This design not only improves defrosting efficiency but also reduces the decrease in heat exchange performance caused by frost, further enhancing the heating capacity of the air conditioning system. This design simplifies the system structure, reduces energy consumption, and improves the overall vehicle's thermal management efficiency and reliability.

[0131] It is understandable that air conditioning systems may also include controllers and pressure and temperature sensors to better control the operation of the air conditioner. The configuration of the controllers and pressure and temperature sensors can be found in existing air conditioning technology and will not be elaborated upon here.

[0132] Please refer to Figure 6 The flowchart below shows a control method for an air conditioning system provided in an embodiment of the present invention, which includes the following steps:

[0133] Step S01: Obtain the operating mode and operating parameters of the air conditioning system.

[0134] In this embodiment, the air conditioning system, through an integrated detection module, can monitor the system's operating mode and operating parameters in real time. For example, the operating mode may include an air conditioning heating mode and a battery cooling mode, and the corresponding operating parameters may include the indoor set temperature, the indoor temperature and the battery set temperature, the first outlet water temperature of the defrost coil, and the second outlet water temperature of the battery unit 15.

[0135] Step S02: When the operating mode is indoor heating mode and battery cooling mode, control the four-way reversing valve 2 to be in the first state, and determine the battery set temperature according to the operating parameters.

[0136] In this embodiment, when the air conditioning system is set to indoor heating mode and 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 allows the refrigerant to flow according to the needs of the refrigeration cycle when the compressor 1, indoor fan 10, outdoor fan 3, and 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 suction port 101 of the compressor 1 through the second interface 202 and the fourth interface 204.

[0137] Step S03: Detect the first water outlet temperature of the defrosting coil and the second water outlet temperature of the battery unit 15, and determine whether the battery set temperature is lower than the second water outlet temperature.

[0138] If yes, proceed to step S04; otherwise, proceed to step S10.

[0139] In this embodiment, by comparing the battery set temperature with the second outlet water temperature, the system can determine whether the current battery heat dissipation is sufficient. If the second outlet water temperature is higher than the battery set 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 set temperature is lower than the second outlet water temperature (i.e., the second outlet water temperature is higher), the system will execute step S04 to further check whether the compressor 1, indoor fan 10, outdoor fan 3, and first expansion valve 6 are in the open state.

[0140] Conversely, if the second outlet water temperature is not higher than the battery set temperature, it indicates that the battery heat dissipation requirement is low or has already been met. In this case, the system will execute step S10 to assess whether it is necessary to terminate the battery heat dissipation mode.

[0141] This embodiment allows the system to dynamically adjust its operating state according to the actual heat dissipation requirements of the battery. By precisely controlling the opening and closing of the heat dissipation components, the system can effectively manage battery temperature while optimizing energy use and equipment lifespan. This method improves the intelligence level of the thermal management system for new energy vehicles, ensuring that the battery receives appropriate heat dissipation under various operating conditions, thereby improving the overall vehicle performance and reliability.

[0142] Step S04: Determine whether the compressor 1, indoor fan 10, outdoor fan 3, and first expansion valve 6 are in the open state.

[0143] If so, proceed to step S05.

[0144] In this embodiment, the system performs a series of status checks on key components to determine whether the heating components in the system are working and continuously providing heat to the vehicle interior. If all these components are activated, step S05 is executed.

[0145] Step S05: Control the three-way valve 12 and water pump 14 to be in the open state.

[0146] In this embodiment, when the compressor 1, indoor fan 10, outdoor fan 3, and first expansion valve 6 are in the open state, it indicates that the heating components in the system are working and continuously providing heat to the vehicle interior. At this time, the system controls the three-way valve 12 and 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 guided to the defrost coil to defrost the outdoor heat exchanger 4.

[0147] Step S06: Determine whether the first outlet water temperature is greater than the battery set temperature.

[0148] If yes, proceed to step S07; otherwise, proceed to step S08.

[0149] In this embodiment, the system compares the battery set temperature with the first outlet temperature of the defrost coil. The purpose of this comparison is to assess whether the temperature of the coolant flowing from the defrost coil is low enough to effectively cool the battery. Subsequent operations are determined by comparing the first outlet temperature (i.e., the outlet temperature of the defrost coil) with the battery set temperature.

[0150] If the initial water outlet temperature is higher than the battery set temperature, it means that the coolant temperature in the defrost coil is still too high to effectively cool the battery. In this case, the system needs to take additional measures to lower the coolant temperature. Therefore, step S07 is executed, which involves opening the second expansion valve 7, allowing the medium-temperature, high-pressure liquid refrigerant flowing from the indoor heat exchanger 9 to be throttled into a low-temperature, low-pressure gas-liquid two-phase refrigerant after passing through the second expansion valve 7, and then entering the first channel 801 of the battery heat exchanger 8. This allows the refrigerant to absorb more heat from the coolant in the battery heat exchanger 8, further reducing the coolant temperature to meet the battery's cooling requirements.

[0151] If the first outlet water temperature is less than or equal to the battery set temperature, proceed directly to step S08.

[0152] This embodiment ensures that the battery operates within its optimal temperature range, preventing overheating and thus extending battery life and improving the overall system efficiency and reliability. In this way, the air conditioning system can flexibly respond to different thermal management needs, optimize heat distribution, and improve the performance of the electric vehicle.

[0153] Step S07: Open the second expansion valve 7.

[0154] Step S08: Determine whether the battery set temperature is greater than or equal to the second outlet water temperature.

[0155] If yes, proceed to step S09; otherwise, return to step S04 to determine whether compressor 1, indoor fan 10, outdoor fan 3, and first expansion valve 6 are in the open state.

[0156] In this embodiment, the system compares the battery set temperature with the second outlet water temperature of the battery cell 15. If the battery set temperature is greater than or equal to the second outlet water temperature, it means that the coolant in the battery cell 15 has reached or fallen below the required temperature, and the battery's heat dissipation requirements have been met. In this case, the system will execute step S09, controlling the water pump 14, the three-way valve 12, and the second expansion valve 7 to be in the closed state.

[0157] If the battery set temperature is lower than the second outlet water temperature, it indicates that the coolant temperature in battery cell 15 is still higher than the required battery temperature, requiring further heat dissipation. Therefore, the system will return to step S04 to reassess and ensure that key components such as compressor 1, indoor fan 10, outdoor fan 3, and first expansion valve 6 are in the appropriate open state to continue effective heat exchange and battery cooling.

[0158] This embodiment allows the air conditioning system to dynamically adjust its operation based on real-time temperature data, ensuring 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 extending battery life.

[0159] Step S09: Control the water pump 14, the three-way valve 12 and the second expansion valve 7 to be in the closed state.

[0160] Step S010: Determine whether the air conditioning system has exited the battery cooling mode based on the operating mode.

[0161] If yes, proceed to step S011; otherwise, return to step S03 to detect the first water outlet temperature of the defrosting coil and the second water outlet temperature of the battery unit 15, and determine whether the battery set temperature is lower than the second water outlet temperature.

[0162] In this embodiment, the system determines whether to exit the battery cooling mode based on the current operating mode. If necessary, i.e., 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 in order to save energy.

[0163] If the system determines that the air conditioning system should not exit battery cooling mode, it will return to step S03 to continue monitoring the first outlet water temperature of the defrost coil and the second outlet water temperature of the battery unit 15, and reassess whether the battery set temperature is lower than the second outlet water temperature. This cyclical monitoring and assessment ensures that the battery cooling mode can be flexibly maintained or adjusted according to actual needs to prevent battery overheating, protect battery performance and lifespan, and optimize the overall energy efficiency of the air conditioning system.

[0164] Step S011: End battery cooling mode.

[0165] Based on the above technical solution, this embodiment acquires the operating mode and parameters. When it detects that simultaneous indoor heating and battery cooling are required, the four-way reversing valve 2 adjusts to a suitable state to ensure proper heat distribution within the system. By real-time monitoring of the outlet water temperature of the defrosting coil and battery unit 15 and comparing it with the battery set temperature, the system can precisely control the opening of the three-way valve 12 and water pump 14, as well as the opening or closing of the second expansion valve 7, thereby optimizing heat utilization and distribution. This embodiment can precisely control the operating status of each component based on real-time temperature data, ensuring that indoor heating and battery cooling requirements are met. Simultaneously, through intelligent adjustment, the system reduces unnecessary energy consumption and improves overall energy efficiency. Furthermore, real-time monitoring and adjustment effectively prevent battery overheating and extend battery life.

[0166] Please refer to Figure 7This is a flowchart illustrating another control method for an air conditioning system provided by an embodiment of the present invention. Based on the above embodiments, in some embodiments, after determining whether the compressor 1, indoor fan 10, outdoor fan 3, and first expansion valve 6 are in the open state, the following can also be executed: Figure 7 The steps shown are as follows:

[0167] Step S11: When the compressor 1, indoor fan 10, outdoor fan 3, and first expansion valve 6 are not in the open state, control the four-way reversing valve 2 to be in the second state.

[0168] In this embodiment, when the compressor 1, indoor fan 10, outdoor fan 3, and first expansion valve 6 are not in the open state, it indicates that the heating components in the system are not working and are not providing heat to the vehicle interior. At this time, the system controls the four-way reversing valve 2 to be in the second state, realizing the connection between the first interface 201 and the second interface 202, as well as the connection between the third interface 203 and the fourth interface 204.

[0169] This control method ensures that when the water pump 14, compressor 1, outdoor fan 3, and third expansion valve 13 are in the open state, the refrigerant flow direction adapts to the battery heat dissipation requirements: 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, where it releases heat and condenses.

[0170] In step S12, control the water pump 14, compressor 1, outdoor fan 3, and third expansion valve 13 to be in the open state, and control the three-way valve 12 to be in the closed state.

[0171] In this embodiment, in order to ensure that the system can fully dissipate heat from the battery, the system turns on these components so that the refrigerant enters the first channel 801 of the battery heat exchanger 8 and absorbs the heat of the coolant in the second channel 802, thereby cooling the coolant.

[0172] Step S13: Determine whether the battery set temperature is greater than or equal to the second outlet water temperature.

[0173] If yes, proceed to step S14; otherwise, return to step S12, control the water pump 14, compressor 1, outdoor fan 3, and third expansion valve 13 to be in the open state, and control the three-way valve 12 to be in the closed state.

[0174] In this embodiment, the system detects the second outlet water temperature of the battery cell 15 to determine whether the battery has reached or fallen below 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.

[0175] Conversely, if the battery set temperature is lower than the outlet water temperature, it means the battery still requires more heat dissipation. In this case, the system will return to step S12, continuing to keep the water pump 14, compressor 1, outdoor fan 3, and third expansion valve 13 open, while controlling the three-way valve 12 to remain closed to continue the heat dissipation process. This feedback loop ensures that the battery temperature can be effectively controlled, preventing overheating, thereby extending battery life and improving the safety and reliability of the entire vehicle.

[0176] Step S14: Control the water pump 14, compressor 1, outdoor fan 3, and third expansion valve 13 to be in the closed state.

[0177] Step S15: Determine whether the air conditioning system has exited the battery cooling mode based on the operating mode.

[0178] If so, proceed to step S16; if the battery cooling mode has not been exited, return to step S03, detect the first outlet water temperature of the defrosting coil and the second outlet water temperature of the battery unit 15, and determine whether the battery set temperature is lower than the second outlet water temperature.

[0179] Step S16: End battery cooling mode.

[0180] 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 battery life and improving the reliability of the entire vehicle. Furthermore, by precisely controlling the on and off states of each component, the system can avoid unnecessary energy waste.

[0181] Please refer to Figure 8 This is a flowchart illustrating another control method for an air conditioning system provided in an embodiment of the present invention. Based on the above embodiments, in some embodiments, when the operating mode is indoor heating mode and battery cooling mode, the following can also be performed: Figure 8 The steps shown are as follows:

[0182] Step S21: Determine the indoor set temperature based on the operating parameters.

[0183] Step S22: Detect the indoor temperature and determine whether the indoor set temperature is greater than the indoor temperature.

[0184] If yes, proceed to step S23; otherwise, proceed to step S26.

[0185] In this embodiment, by monitoring the indoor temperature in real time and comparing it with the user-set indoor temperature, the aim is to ensure the comfort of the indoor environment while optimizing energy use. If the detected indoor temperature is lower than the set indoor temperature, it means that more heat is needed to raise the indoor temperature to meet the user's comfort requirements. In this case, the system will execute step S23, controlling the compressor 1, indoor fan 10, outdoor fan 3, and first expansion valve 6 to be in the open state to start or maintain the indoor heating process.

[0186] Conversely, if the indoor temperature has reached or exceeded the set indoor temperature, it indicates that the room is already warm enough, or may be overheated. In this case, the system will execute step S26.

[0187] This embodiment provides an automated temperature control mechanism that intelligently adjusts the operating status of the air conditioning system based on a comparison between the actual indoor temperature and the user-set temperature. This not only improves energy efficiency and reduces energy waste but also ensures indoor environmental comfort and enhances passenger satisfaction. In this way, the air conditioning system can more precisely control indoor temperature while taking into account energy conservation and environmental protection requirements.

[0188] Step S23: Control the compressor 1, indoor fan 10, outdoor fan 3, and first expansion valve 6 to be in the open state.

[0189] Step S24: Determine whether the indoor set temperature is less than or equal to the indoor temperature.

[0190] If yes, proceed to step S25; otherwise, return to step S23 and control the compressor 1, indoor fan 10, outdoor fan 3, and first expansion valve 6 to be in the open state.

[0191] 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, controlling the compressor 1, indoor fan 10, outdoor fan 3, and first expansion valve 6 to be in the closed state to stop the heating process, save energy, and prevent indoor overheating.

[0192] If the indoor set temperature is higher than the indoor temperature, the system will return to step S23, continue to keep the heating component on, and continue to heat up the indoor temperature until the user-set comfort level is reached.

[0193] Step S25: Control the compressor 1, indoor fan 10, outdoor fan 3, and first expansion valve 6 to be in the closed state.

[0194] Step S26: When the compressor 1, indoor fan 10, outdoor fan 3, and first expansion valve 6 are in the closed state, determine whether the air conditioning system should exit the indoor heating mode according to the operating mode.

[0195] If not, return to step S22 to detect the indoor temperature and determine whether the indoor set temperature is greater than the indoor temperature.

[0196] If so, proceed to step S27.

[0197] In this embodiment, the system checks whether the compressor 1, indoor fan 10, outdoor fan 3, and first expansion valve 6 are all in the closed state. If these components are already closed, the system will decide whether to terminate the indoor heating mode based on the current operating mode.

[0198] If the current operating mode is indoor heating mode, the system will return to step S22 to continue monitoring the indoor temperature and comparing it with the set indoor temperature to determine whether the heating element needs to be restarted. This cycle ensures that the indoor temperature can be continuously monitored and automatically adjusted as needed to maintain user comfort.

[0199] If the current operating mode is no longer indoor heating mode, proceed to step S27 to officially end the indoor heating mode. This may be because the user has manually turned off the heating requirement. Ending the heating mode saves energy, avoids unnecessary energy consumption, and ensures that the system does not continue to run the heating components when not needed.

[0200] Step S27: End indoor heating mode.

[0201] Based on the above technical solution, this embodiment allows the system to dynamically adjust its heating output according to the actual indoor temperature demand, thereby improving energy efficiency and passenger comfort. By precisely controlling the on and off of the heating components, the system can avoid unnecessary energy waste while ensuring that the indoor temperature remains within the user-set comfort range.

[0202] This embodiment provides an electronic device, including a processor and a memory. The memory is used to store at least one instruction. When the instruction is loaded and executed by the processor, it implements the control method of the air conditioning system described above. Its execution method and beneficial effects are similar and will not be described again here.

[0203] This invention provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the control method of the air conditioning system described above. The execution method and beneficial effects are similar and will not be repeated here.

[0204] It should be noted that although the steps are described in a specific order above, it does not mean that the 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 function can be achieved.

[0205] 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 within 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 exchanger, first expansion valve, second expansion valve, defrost coil, three-way valve; Wherein, 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 intake port of the compressor. The battery 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 of the compressor. The second channel is used to connect in series with the battery cell to cool the high-temperature coolant of the battery cell 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 connected to the battery unit, the second end is connected to the inlet of the defrosting coil, and the third end is connected to the second channel. The outlet of the defrosting coil is connected between the third end and the second channel to output the high-temperature coolant of the battery unit to the defrosting coil or the battery heat exchanger. The air conditioning system also includes: A drying filter is located between the outdoor heat exchanger and the first expansion valve; The air conditioning system also 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 is connected between the first channel and the second expansion valve; 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. 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 defrosting coil, and the third end of the three-way valve is connected to the other end of the second channel. Furthermore, when the three-way valve is open, the first end and the second end are connected, but the first end and the third end are not connected; when the three-way valve is closed, the first end and the second end are not connected, but the first end and the third end are connected.

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 port of the four-way reversing valve is connected to the exhaust port of the compressor, the second port of the four-way reversing valve is connected to the outdoor heat exchanger, the third port of the four-way reversing valve is connected to the indoor heat exchanger, and the fourth port of the four-way reversing valve is connected to the suction port of the compressor. Furthermore, when the four-way reversing valve is in the first state, the first interface and the third interface are connected, and the second interface and the fourth interface are connected; when the four-way reversing valve is in the second state, the first interface and the second interface are connected, and the third interface and the fourth interface are connected.

3. The air conditioning system according to claim 2, characterized in that, The air conditioning system also includes: A gas-liquid separator is located between the fourth port of the four-way reversing valve and the suction port of the compressor; An indoor fan is arranged adjacent to the indoor heat exchanger to achieve forced convection heat exchange between the indoor heat exchanger and the indoor air. An outdoor fan is arranged adjacent to the outdoor heat exchanger to achieve forced convection heat exchange between the outdoor heat exchanger and the outdoor air.

4. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes an expansion tank, wherein: One end of the expansion tank is connected between the first end of the three-way valve and the outlet of the battery unit, and the other end is connected between the second channel and the water pump.

5. A control method for an air conditioning system, applied to the air conditioning system as described in any one of claims 1-4, characterized in that, include: Obtain the operating mode and operating parameters of the air conditioning system; When the operating mode is indoor heating mode and battery cooling mode, the four-way reversing valve is controlled to be in the first state, and the battery set temperature is determined according to the operating parameters. The first outlet water temperature of the defrosting coil and the second outlet water temperature of the battery unit are detected, and it is determined whether the set temperature of the battery is lower than the second outlet water temperature. If so, determine whether the compressor, indoor fan, outdoor fan, and first expansion valve are in the open state; If it is in the open state, it controls the three-way valve and water pump to be in the open state; Determine whether the temperature of the first outlet water is greater than the set temperature of the battery; If the temperature of the first outlet water is greater than the set temperature of the battery, then the second expansion valve is opened; If the first outlet water temperature is less than or equal to the battery set temperature, then determine whether the battery set temperature is greater than or equal to the second outlet water temperature; If the battery set temperature is lower than the second outlet water temperature, then return to the step of determining whether the compressor, indoor fan, outdoor fan, and first expansion valve are in the open state; If the battery set temperature is greater than or equal to the second outlet water temperature, then the water pump, the three-way valve, and the second expansion valve are controlled to be in the closed state; Determine whether the air conditioning system has exited the battery cooling mode based on the operating mode; If the battery cooling mode is not exited, the process returns to the steps of detecting the first outlet water temperature of the defrosting coil and the second outlet water temperature of the battery unit, and determining whether the battery set temperature is lower than the second outlet water temperature. If you exit battery cooling mode, the battery cooling mode will end.

6. The control method according to claim 5, characterized in that, After determining whether the compressor, indoor fan, outdoor fan, and first expansion valve are in the open state, the method further includes: When the compressor, the indoor fan, the outdoor fan, and the first expansion valve are not in the open state, the four-way reversing valve is controlled to be in the second state; The water pump, the compressor, the outdoor fan, and the third expansion valve are controlled to be in the open state, and the three-way valve is controlled to be in the closed state. Determine whether the battery set temperature is greater than or equal to the second outlet water 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 the open state, and controlling the three-way valve to be in the closed state; If so, then the water pump, the compressor, the outdoor fan, and the third expansion valve are controlled to be in the closed state; Determine whether the air conditioning system has exited the battery cooling mode based on the operating mode; If the battery cooling mode is not exited, the process returns to the steps of detecting the first outlet water temperature of the defrosting coil and the second outlet water temperature of the battery unit, and determining whether the battery set temperature is lower than the second outlet water temperature. If you exit battery cooling mode, the battery cooling mode will end.

7. The method according to claim 5, characterized in that, When the operating mode is indoor heating mode and battery cooling mode, the method further includes: Determine the indoor set temperature based on the aforementioned operating parameters; Detect the indoor temperature and determine whether the set indoor temperature is greater than the indoor temperature. If so, then the compressor, the indoor fan, the outdoor fan, and the first expansion valve are controlled to be in the open state; Determine whether the set indoor temperature is less than or equal to the indoor temperature; If the indoor set temperature is less than or equal to the indoor temperature, then the compressor, the indoor fan, the outdoor fan, and the first expansion valve are controlled to be in the closed state. When the compressor, the indoor fan, the outdoor fan, and the first expansion valve are in the closed state, it is determined whether the air conditioning system should exit the indoor heating mode according to the operating mode; If the indoor heating mode is not exited, return to the step of detecting the indoor temperature and determining whether the indoor set temperature is greater than the indoor temperature. If you exit the indoor heating mode, the indoor heating mode will end.

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