Air conditioning system, control method thereof and energy storage battery unit

Abstract

The invention provides an air conditioning system and a control method thereof, and an energy storage battery unit, the air conditioning system comprises a first compressor having a first air suction port and a first exhaust port, an intercooler having a first inlet, a first outlet, a second inlet and a second outlet, and a heat exchanger having a first heat exchange flow channel; the evaporator is provided with a second heat exchange flow channel and a third heat exchange flow channel which can conduct heat exchange, the first exhaust port, the first inlet, the first outlet, the second heat exchange flow channel and the first air suction port are sequentially connected, the second outlet is connected to one end of the first heat exchange flow channel, and the other end of the first heat exchange flow channel is connected to the second inlet through a one-way valve. The heat exchanger is in heat exchange connection with target equipment, and the circulating pump, the third heat exchange flow channel and a fourth heat exchange flow channel in the target equipment form a liquid cooling circulation loop. According to the invention, the air conditioning system can perform liquid cooling on the energy storage battery cabinet and can also perform refrigeration on the energy storage battery cabinet, so that the cooling effect on the energy storage battery cabinet is better.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery cabinets, and in particular relates to an air conditioning system and a control method thereof, and an energy storage battery unit. Background Art

[0002] Conventional energy storage battery cabinets are usually equipped with a liquid cooling system to cool themselves. After the energy storage battery cabinet is equipped with a liquid cooling system, an energy storage battery unit is formed. The energy storage battery unit has a cabinet-type shell, and the energy storage battery cabinet and the liquid cooling system are both in the cabinet-type shell. Since the cabinet-type shell is usually in a semi-enclosed state, there is little air flow and heat tends to accumulate quickly. Therefore, it is difficult to effectively cool the energy storage battery cabinet only by the liquid cooling system. Summary of the invention

[0003] Therefore, the present invention provides an air conditioning system that can solve the technical problem that the liquid cooling system equipped with the existing energy storage battery cabinet is difficult to effectively cool the energy storage battery cabinet.

[0004] In order to solve the above problems, the present invention provides an air conditioning system, including: a first compressor, an intercooler, a heat exchanger, an evaporator, a circulation pump and a one-way valve, the first compressor having a first air intake port and a first exhaust port, the intercooler having a first inlet, a first outlet, a second inlet and a second outlet, the heat exchanger having a first heat exchange channel, the evaporator having a second heat exchange channel and a third heat exchange channel capable of heat exchange, the first exhaust port being connected to the first inlet, the first outlet being connected to one end of the second heat exchange channel, the other end of the second heat exchange channel being connected to the first air intake port, the second outlet being connected to one end of the first heat exchange channel, the other end of the first heat exchange channel being connected to the second inlet through the one-way valve, the one-way valve being used to conduct the flow from the first heat exchange channel to the intercooler, the heat exchanger being connected to a target device for heat exchange, a fourth heat exchange channel being formed in the target device, and the circulation pump, the third heat exchange channel and the fourth heat exchange channel forming a liquid cooling circulation loop.

[0005] In some embodiments, the air-conditioning system also includes a three-way valve, the three-way valve having a first valve port, a second valve port and a third valve port, the heat exchanger also has a fifth heat exchange channel, the first valve port is connected to the first exhaust port, the second valve port is connected to the first inlet, the third valve port is connected to one end of the fifth heat exchange channel, and the other end of the fifth heat exchange channel is connected to the flow path between the first outlet and the second heat exchange channel.

[0006] In some embodiments, a fan is disposed outside the heat exchanger, and the heat exchanger is located between the fan and the target device.

[0007] In some embodiments, the second outlet is connected to one end of the first heat exchange channel through a control valve.

[0008] In some embodiments, an electric heater is provided on the liquid cooling circulation loop, and the electric heater can heat the coolant flowing in the liquid cooling circulation loop.

[0009] In some embodiments, the air conditioning system further includes a second compressor and a condenser, the second compressor having a second air intake port and a second air exhaust port, the condenser having a third inlet and a third outlet, the intercooler further having a fourth inlet and a fourth outlet, the second air exhaust port being connected to the third inlet, the third outlet being connected to the fourth inlet, and the fourth outlet being connected to the second air intake port.

[0010] The present invention also provides a control method for controlling the operation of the aforementioned air conditioning system, the control method comprising:

[0011] The outside temperature is T;

[0012] When T<T1, controlling the air conditioning system to operate in heating mode;

[0013] When T1≤T<T2, controlling the air conditioning system to operate in the first cooling mode;

[0014] When T≥T2, controlling the air conditioning system to operate in the second cooling mode;

[0015] Wherein, T1 is a first preset temperature, T2 is a second preset temperature, and T2>T1.

[0016] In some embodiments, when the air-conditioning system includes a three-way valve, a fan and a control valve, the first refrigeration mode includes: controlling the first compressor to start, controlling the first valve port of the three-way valve to be connected to the second valve port, controlling the control valve to open, controlling the fan to run, and controlling the circulation pump to turn on.

[0017] In some embodiments, when the air-conditioning system includes a three-way valve, a fan and a control valve, the second refrigeration mode includes: controlling the first compressor to start, controlling the first valve port of the three-way valve to be connected to the second valve port, controlling the control valve to close, controlling the fan to run, and controlling the circulation pump to turn on.

[0018] In some implementations, when the air conditioning system further includes a second compressor, the second compressor is controlled to start.

[0019] In some embodiments, when the air-conditioning system includes a three-way valve, a fan and an electric heater, the heating mode includes: controlling the first compressor to start, controlling the first valve port of the three-way valve to be connected to the third valve port, controlling the fan to run, controlling the circulation pump to start, and controlling the electric heater to power on.

[0020] The present invention also provides an energy storage battery unit, comprising the aforementioned air conditioning system and an energy storage battery cabinet, wherein the energy storage battery cabinet is the target device.

[0021] The present invention provides an air conditioning system and a control method thereof, and an energy storage battery unit, which have the following beneficial effects:

[0022] In the air conditioning system of the present application, the target device is an energy storage battery cabinet, and when the battery cabinet needs to be cooled, the high-temperature and high-pressure refrigerant discharged by the first compressor enters the intercooler to become a gas-liquid two-phase refrigerant, and the liquid refrigerant flows out in two ways. One liquid refrigerant flows out from the first outlet of the intercooler, then flows into the second heat exchange channel of the evaporator for evaporation and heat absorption, and finally returns to the first compressor to form a cycle. At the same time, the circulating pump is turned on, and the coolant circulates in the circulation loop. The refrigerant exchanges heat with the coolant flowing through the third heat exchange channel during the process of flowing through the second heat exchange channel, so that the coolant in the circulation loop is cooled, and the cooled coolant liquid cools the energy storage battery cabinet; the other liquid refrigerant flows out from the second outlet of the intercooler, and then flows into the first heat exchange channel of the heat exchanger for evaporation and heat absorption. Since the heat exchanger is connected to the energy storage battery cabinet for heat exchange, the heat exchanger can absorb the heat generated by the energy storage battery cabinet and cool it down. Finally, the refrigerant in the first heat exchange channel returns to the intercooler to form a cycle. That is, the air conditioning system of the present application can perform both liquid cooling and refrigeration cooling on the energy storage battery cabinet, thereby achieving a better cooling effect on the energy storage battery cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0024] Figure 1 A schematic diagram of an energy storage battery unit according to an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the flow direction of refrigerant and coolant when the air conditioning system of the energy storage battery unit according to the embodiment of the present invention operates in the first cooling mode;

[0026] Figure 3 It is a schematic diagram of the flow direction of refrigerant and coolant when the air conditioning system of the energy storage battery unit according to the embodiment of the present invention operates in the second cooling mode;

[0027] Figure 4 A schematic diagram of the flow of refrigerant and coolant when the air conditioning system of the energy storage battery unit according to an embodiment of the present invention operates in a heating mode;

[0028] Figure 5 A control flow chart of an air conditioning system of an energy storage battery unit according to an embodiment of the present invention;

[0029] Figure 6 It is a schematic diagram of an energy storage battery unit in the prior art.

[0030] The reference numerals are:

[0031] 1. First compressor; 2. Intercooler; 3. Heat exchanger; 4. Evaporator; 5. Circulation pump; 6. One-way valve; 7. First valve port; 8. Second valve port; 9. Third valve port; 10. Control valve; 11. Electric heater; 12. Second compressor; 13. Condenser; 14. Energy storage battery cabinet; 15. First throttling element; 16. Second throttling element. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. 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.

[0033] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0034] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0035] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0036] See also Figures 1 to 5 As shown, according to an embodiment of the present invention, an air conditioning system is provided, comprising: a first compressor 1, an intercooler 2, a heat exchanger 3, an evaporator 4, a circulation pump 5 and a check valve 6. The first compressor 1 has a first air intake port and a first air exhaust port, the intercooler 2 has a first inlet, a first outlet, a second inlet and a second outlet, the heat exchanger 3 has a first heat exchange channel, and the evaporator 4 has a second heat exchange channel and a third heat exchange channel capable of heat exchange. The first exhaust port is connected to the first inlet, the first outlet is connected to one end of the second heat exchange channel, the other end of the second heat exchange channel is connected to the first air intake port, the second outlet is connected to one end of the first heat exchange channel, and the other end of the first heat exchange channel is connected to the second inlet through a check valve 6, and the check valve 6 is used to conduct the flow from the first heat exchange channel to the intercooler 2. The heat exchanger 3 is connected to the target device for heat exchange, and a fourth heat exchange channel is formed in the target device. The circulation pump 5, the third heat exchange channel, and the fourth heat exchange channel form a liquid cooling circulation loop.

[0037] In this technical solution, the air-conditioning system of the present application is applied to an energy storage battery unit, the target equipment is an energy storage battery cabinet, and when the battery cabinet needs to be cooled, the high-temperature and high-pressure refrigerant discharged by the first compressor 1 enters the intermediate cooler 2 and becomes a gas-liquid two-phase refrigerant, in which the liquid refrigerant flows out in two ways. One path of liquid refrigerant flows out from the first outlet of the intercooler 2, then flows into the second heat exchange channel of the evaporator 4 for evaporation and heat absorption, and finally returns to the first compressor 1 to form a cycle. At the same time, the circulating pump 5 is turned on, and the coolant circulates in the circulation loop. The refrigerant exchanges heat with the coolant flowing through the third heat exchange channel during the process of flowing through the second heat exchange channel, so that the coolant in the circulation loop is cooled, and the cooled coolant liquid cools the energy storage battery cabinet 14; the other path of liquid refrigerant flows out from the second outlet of the intercooler 2, and then flows into the first heat exchange channel of the heat exchanger 3 for evaporation and heat absorption. Since the heat exchanger 3 is connected to the energy storage battery cabinet 14 for heat exchange, the heat exchanger 3 can absorb the heat generated by the energy storage battery cabinet 14 and cool it down. Finally, the refrigerant in the first heat exchange channel returns to the intercooler 2 to form a cycle. That is, the air conditioning system of the present application can perform both liquid cooling and refrigeration cooling on the energy storage battery cabinet 14 , thereby achieving a better cooling effect on the energy storage battery cabinet 14 .

[0038] See also Figure 4 As shown, the air-conditioning system also includes a three-way valve, which has a first valve port 7, a second valve port 8 and a third valve port 9. The heat exchanger 3 also has a fifth heat exchange channel. The first valve port 7 is connected to the first exhaust port, the second valve port 8 is connected to the first inlet, the third valve port 9 is connected to one end of the fifth heat exchange channel, and the other end of the fifth heat exchange channel is connected to the flow path between the first outlet and the second heat exchange channel.

[0039] In this embodiment, when the outside temperature is low and the energy storage battery cabinet 14 needs to be kept warm, the first valve port 7 and the third valve port 9 of the three-way valve are controlled to be connected, and the high-temperature and high-pressure refrigerant discharged from the first compressor 1 enters the fifth heat exchange flow channel of the heat exchanger 3 for condensation. During the condensation process, the heat exchanger 3 releases heat to the outside to keep the energy storage battery cabinet 14 warm. The condensed refrigerant flows through the second heat exchange flow channel of the evaporator 4 for evaporation and heat absorption, and finally returns to the first compressor 1 to form a cycle. When the energy storage battery cabinet 14 needs to be cooled, it is only necessary to control the first valve port 7 and the second valve port 8 of the three-way valve to be connected, and control the first compressor 1 and the circulation pump 5 to start. Among them, a connection node is formed after the other end of the fifth heat exchange flow channel is connected to the flow path between the first outlet and the second heat exchange flow channel, and a first throttling element 15 is provided on the flow path between the connection node and the evaporator 4. The first throttling element 15 is used to throttle the refrigerant flowing out of the fifth heat exchange flow channel of the intercooler 2 or the heat exchanger 3.

[0040] It should be noted that in the prior art, the liquid cooling system can only cool the energy storage battery cabinet 14, while the air conditioning system of the present application can not only effectively cool the energy storage battery cabinet 14, but also keep the energy storage battery cabinet 14 warm when the outside temperature is low. Moreover, for general air conditioning systems, a four-way valve needs to be set to achieve cooling and heating, while the air conditioning system of the present application only needs to set a three-way valve to achieve cooling and heating. It can be understood that cooling or keeping the energy storage battery cabinet 14 warm mainly refers to cooling or keeping the batteries in the energy storage battery cabinet 14 warm.

[0041] See also Figure 4 As shown, an electric heater 11 is provided on the liquid cooling circulation loop, and the electric heater can heat the coolant circulating in the liquid cooling circulation loop. That is, when the outside temperature is low and the energy storage battery cabinet 14 needs to be kept warm, the coolant in the liquid cooling circulation loop can also be heated by the electric heater 11, so that the heated coolant can also keep the energy storage battery cabinet 14 warm. The coolant can be water.

[0042] As a specific implementation, a fan is provided on the outside of the heat exchanger 3, and the heat exchanger 3 is located between the fan and the target device. When the fan is running, the airflow generated by the fan can quickly bring the cold or heat generated by the heat exchanger 3 into the energy storage battery cabinet 14, thereby achieving a better cooling or heat preservation effect on the energy storage battery cabinet 14 and improving the uniformity of cooling or heat preservation. Because the heat exchanger 3 plays the role of both an evaporator and a condenser, and the heat exchanger 3 is also equipped with a fan, the heat exchanger 3 of the present application can be referred to as an air-cooled evaporative condenser, and the fan of the present application can be referred to as an air-cooled evaporative condenser fan.

[0043] See also Figure 3As shown, the second outlet is connected to one end of the first heat exchange flow channel through the control valve 10, and the control valve 10 can be an existing solenoid valve or an electric valve. When the energy storage battery cabinet 14 needs to be cooled, the first valve port 7 and the second valve port 8 of the three-way valve can also be controlled to be connected, the control valve 10 can be controlled to be closed, the first compressor 1 and the circulating pump 5 can be controlled to start, and the fan can be controlled to run. Then, the high-temperature and high-pressure refrigerant discharged from the first compressor 1 enters the intercooler 2 and becomes a gas-liquid two-phase refrigerant. Since the control valve 10 is closed, the liquid refrigerant therein only flows out from the first outlet of the intercooler 2, and then flows into the second heat exchange flow channel of the evaporator 4 for evaporation and heat absorption, and finally returns to the first compressor 1. In the process of flowing through the second heat exchange flow channel, the refrigerant exchanges heat with the coolant flowing through the third heat exchange flow channel, so that the coolant in the circulation loop is cooled, and the cooled coolant liquid cools the energy storage battery cabinet 14. Since the heat exchanger 3 does not participate in cooling the energy storage battery cabinet 14, but the fan is running to cool the energy storage battery cabinet 14, the operation mode of the air conditioning system in this state can be called the maximum liquid supply cooling plus air cooling mode. In this mode, the energy storage battery cabinet 14 can be better cooled, especially when the external ambient temperature is high.

[0044] See also Figures 2 to 4 As shown, the air conditioning system further includes a second compressor 12 and a condenser 13, the second compressor 12 has a second air intake port and a second air exhaust port, the condenser 13 has a third inlet and a third outlet, the intercooler 2 also has a fourth inlet and a fourth outlet, the second air exhaust port is connected to the third inlet, the third outlet is connected to the fourth inlet, and the fourth outlet is connected to the second air intake port. The condenser 13 is correspondingly provided with a condensing fan.

[0045] In this embodiment, when the external environment temperature is high, the existing liquid cooling system often has the problem of high exhaust temperature and high heat load of the condenser 13, which easily causes the liquid cooling system to shut down, and has a great impact on the stable operation of the energy storage battery unit. The air conditioning system of the present application adds a second compressor 12 to become a two-stage compression, in which the first compressor 1 can be called a low-pressure compressor, and the second compressor 12 can be called a high-pressure compressor. When the energy storage battery cabinet 14 needs to be cooled, the first valve port 7 and the second valve port 8 of the three-way valve are connected, and the high-temperature and high-pressure refrigerant discharged by the first compressor 1 enters the intercooler 2 to become a gas-liquid two-phase refrigerant, and the second compressor 12 sucks and compresses the gaseous refrigerant in the intercooler 2. Since the gaseous refrigerant has been compressed once by the first compressor 1 and has a certain initial pressure, when the second compressor 12 is sucked in, only a small pressure ratio is needed to make the refrigerant reach a predetermined pressure, and the small pressure ratio also makes the refrigerant temperature discharged by the second compressor 12 not too high, so the heat load and exhaust temperature of the condenser 13 will not be too high, thereby avoiding the shutdown of the air conditioning system. That is to say, compared with the conventional single-stage compression liquid cooling system, the two-stage compression condensation load is smaller, which is beneficial to the stability of the system when operating at high temperatures.

[0046] It should also be noted that a second throttling element 16 is provided on the flow path between the third outlet of the condenser 13 and the fourth inlet of the intercooler 2. After the second compressor 12 sucks in and compresses the gaseous refrigerant in the intercooler 2, the refrigerant discharged therefrom flows into the condenser 13 for condensation, and then returns to the intercooler 2 after being throttled by the second throttling element 16. Since the temperature of the refrigerant after throttling by the second throttling element 16 is relatively low, when the throttled refrigerant flows into the intercooler 2, it will cool the high-temperature and high-pressure gaseous refrigerant discharged by the first compressor 1, thereby converting the high-temperature and high-pressure gaseous refrigerant into a gas-liquid two-phase refrigerant, and this method enables the intercooler 2 to have an automatic cooling function.

[0047] The present invention also provides a control method for controlling the operation of the aforementioned air conditioning system, the control method comprising:

[0048] Get the external temperature T;

[0049] When T<T1, the air conditioning system is controlled to operate in heating mode;

[0050] When T1≤T<T2, the air conditioning system is controlled to operate in the first cooling mode;

[0051] When T≥T2, the air conditioning system is controlled to operate in the second cooling mode;

[0052] Wherein, T1 is a first preset temperature, T2 is a second preset temperature, and T2>T1.

[0053] In this technical solution, T1 is 5°C and T2 is 35°C. When the outside temperature is less than 5°C, it indicates that the outside temperature is low, and it is necessary to control the air conditioning system to operate the heating mode to keep the energy storage battery cabinet 14 warm; when the outside temperature is greater than or equal to 5°C and less than 35°C, it indicates that the outside temperature is moderate, but the energy storage battery cabinet 14 will heat up during operation, and it is necessary to control the air conditioning system to operate the first cooling mode to cool the energy storage battery cabinet 14; when the outside temperature is greater than 35°C, it indicates that the outside temperature is high, and the energy storage battery cabinet 14 will heat up during operation, and it is necessary to control the air conditioning system to operate the second cooling mode to cool the energy storage battery cabinet 14.

[0054] As a specific implementation, when the air conditioning system includes the first compressor 1, the intercooler 2, the heat exchanger 3, the evaporator 4, the circulating pump 5, the one-way valve 6, the first throttling element 15, the three-way valve, the fan and the control valve 10, the first refrigeration mode includes: controlling the first compressor 1 to start, controlling the first valve port 7 of the three-way valve to communicate with the second valve port 8, controlling the control valve 10 to open, controlling the fan to run, and controlling the circulating pump 5 to start. Then the high-temperature and high-pressure refrigerant discharged from the first compressor 1 enters the intercooler 2 after the three-way valve is switched to become a gas-liquid two-phase refrigerant, and the liquid refrigerant flows out in two ways. One liquid refrigerant flows out from the first outlet of the intercooler 2, flows into the second heat exchange channel of the evaporator 4 after passing through the first throttling element 15, evaporates and absorbs heat, and finally returns to the first compressor 1 to form a cycle. At the same time, the circulating pump 5 is turned on, and the coolant circulates in the circulation loop. The refrigerant exchanges heat with the coolant flowing through the third heat exchange channel while flowing through the second heat exchange channel, so that the coolant in the circulation loop cools down, and the cooled coolant liquid cools the energy storage battery cabinet 14. Another liquid refrigerant flows out from the second outlet of the intercooler 2, and then flows into the first heat exchange channel of the heat exchanger 3 for evaporation and heat absorption. Since the fan is also running, the fan can blow cold air into the energy storage battery cabinet 14 to cool it. Finally, the refrigerant in the first heat exchange channel returns to the intercooler 2 to form a cycle. That is, in the first cooling mode, the air conditioning system can both liquid cool the energy storage battery cabinet 14 and cool the energy storage battery cabinet 14.

[0055] Further, when the air conditioning system includes the first compressor 1, the intercooler 2, the heat exchanger 3, the evaporator 4, the circulating pump 5, the one-way valve 6, the first throttling element 15, the three-way valve, the fan and the control valve 10, the second refrigeration mode includes: controlling the first compressor 1 to start, controlling the first valve port 7 of the three-way valve to communicate with the second valve port 8, controlling the control valve 10 to close, controlling the fan to run, and controlling the circulating pump 5 to start. Then the high-temperature and high-pressure refrigerant discharged from the first compressor 1 enters the intercooler 2 and becomes a gas-liquid two-phase refrigerant. Since the control valve 10 is closed, the liquid refrigerant therein only flows out from the first outlet of the intercooler 2, flows into the second heat exchange channel of the evaporator 4 after passing through the first throttling element 15, evaporates and absorbs heat, and finally returns to the first compressor 1. In the process of flowing through the second heat exchange channel, the refrigerant exchanges heat with the coolant flowing through the third heat exchange channel, so that the coolant in the circulation loop is cooled, and the cooled coolant performs liquid cooling on the energy storage battery cabinet 14. Since the heat exchanger 3 does not participate in cooling the energy storage battery cabinet 14, but the fan is running to cool the energy storage battery cabinet 14, the second cooling mode can be called the maximum liquid supply cooling plus air cooling mode. When the external environment temperature is greater than or equal to 35°C, the maximum liquid supply cooling plus air cooling can better cool the energy storage battery cabinet 14.

[0056] Furthermore, when the air conditioning system is running in the first refrigeration mode or the second refrigeration mode, if the air conditioning system also includes a second compressor 12, a condenser 13 and a second throttling element 16, it is necessary to control the second compressor 12 to start, and the second compressor 12 sucks and compresses the gaseous refrigerant in the intercooler 2. Since the gaseous refrigerant has been compressed once by the first compressor 1 and has a certain initial pressure, only a small pressure ratio is needed after the second compressor 12 sucks it in to make the refrigerant reach a predetermined pressure, and the small pressure ratio also makes the temperature of the refrigerant discharged by the second compressor 12 not too high, so the heat load and exhaust temperature of the condenser 13 will not be too high, thereby avoiding the air conditioning system from shutting down. That is, the two-stage compression condensation load is smaller, which is beneficial to the stability of the system when running at high temperature. After the second compressor 12 sucks and compresses the gaseous refrigerant in the intercooler 2, the refrigerant discharged flows into the condenser 13 for condensation, and then returns to the intercooler 2 after throttling by the second throttling element 16. Since the temperature of the refrigerant after throttling by the second throttling element 16 is relatively low, when the throttled refrigerant flows into the intercooler 2, it will cool the high-temperature and high-pressure gaseous refrigerant discharged from the first compressor 1, thereby turning the high-temperature and high-pressure gaseous refrigerant into a gas-liquid two-phase refrigerant. In this way, the intercooler 2 has an automatic cooling function. Specifically, when the complete air-conditioning system operates in the first cooling mode, the flow directions of the refrigerant and the coolant are as follows: Figure 2 When the complete air conditioning system operates in the second cooling mode, the flow direction of the refrigerant and coolant is as follows: Figure 3 shown.

[0057] As a specific implementation, the heating mode includes: controlling the first compressor 1 to start, controlling the first valve port 7 of the three-way valve to be connected to the third valve port 9, controlling the fan to run, controlling the circulating pump 5 to start, and controlling the electric heater 11 to be powered on. The high-temperature and high-pressure refrigerant discharged from the first compressor 1 enters the fifth heat exchange channel of the heat exchanger 3 for condensation. During the condensation process, the heat exchanger 3 releases heat to the outside and the fan also runs, so the fan can blow hot air into the energy storage battery cabinet 14 to keep it warm. The condensed refrigerant is throttled by the first throttling element 15 and flows into the second heat exchange channel of the evaporator 4 for evaporation and heat absorption, and finally returns to the first compressor 1 to form a cycle. At the same time, the electric heater 11 is powered on, and the electric heater 11 heats the coolant circulating in the liquid cooling circulation loop, so that the heated coolant also keeps the energy storage battery cabinet 14 warm. Specifically, when the complete air-conditioning system operates in the heating mode, the flow direction of the refrigerant and the coolant is as follows: Figure 4 shown.

[0058] Figure 5 The control flow chart of the air conditioning system according to the embodiment of the present invention is shown in FIG. Figure 5 Mode 1 is the first cooling mode, mode 2 is the second cooling mode, and mode 3 is the heating mode. In the first cooling mode, the water temperature (i.e., the coolant temperature) can also be controlled by adjusting the frequency of the high-pressure compressor, and the speed of the air-cooled evaporative condenser fan can be adjusted according to the temperature in the warehouse where the energy storage battery cabinet 14 is located to appropriately cool down the energy storage battery cabinet 14. In the second cooling mode, the air-cooled evaporative condenser fan can also be controlled to run at full speed so that a larger air volume per unit time can be used to cool down the energy storage battery cabinet 14, and the frequency of the high-pressure compressor can be adjusted to control the water temperature, thereby effectively cooling down the energy storage battery cabinet 14. In the heating mode, the air-cooled evaporative condenser fan can also be controlled to run at a low speed and the frequency of the low-pressure compressor can be adjusted to control the supply air temperature to appropriately keep the energy storage battery cabinet 14 warm.

[0059] The present invention also provides an energy storage battery unit, including the aforementioned air conditioning system and an energy storage battery cabinet 14, wherein the energy storage battery cabinet 14 is the aforementioned target device, the energy storage battery unit has a cabinet-type housing, and the air conditioning system and the energy storage battery cabinet 14 are both in the cabinet-type housing. It can be understood that the air conditioning system of the present application can also be applied to other devices with large heat generation in addition to the battery cabinet.

[0060] Figure 6 The schematic diagram of the energy storage battery unit in the prior art is shown. Figure 6In the embodiment, the second compressor 12, the condenser 13, the second throttling element 16 and the evaporator 4 form a refrigerant circulation loop, and the circulating pump 5, the evaporator 4 and the energy storage battery cabinet 14 form a liquid cooling circulation loop. The refrigerant discharged from the second compressor 12 flows into the condenser 13 for condensation and heat release, and then flows through the second throttling element 16 for throttling. The throttled refrigerant flows into a heat exchange flow channel of the evaporator 4 for evaporation and heat absorption, and finally returns to the second compressor 12 to form a refrigerant cycle. At the same time, the circulating pump 5 drives the coolant to circulate in the liquid cooling circulation loop. In the process of the coolant flowing through another heat exchange flow channel of the evaporator 4, it exchanges heat with the refrigerant and cools down. The cooled coolant liquid cools the energy storage battery cabinet 14. It can be seen from this that the liquid cooling system can only liquid cool the energy storage battery cabinet 14, and it has the disadvantages of poor cooling effect, inability to keep the energy storage battery cabinet 14 warm, and high exhaust temperature. The present application just overcomes these deficiencies in the prior art.

[0061] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0062] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that: The invention comprises a first compressor (1), an intercooler (2), a heat exchanger (3), an evaporator (4), a circulation pump (5) and a one-way valve (6), wherein the first compressor (1) has a first air intake port and a first air exhaust port, the intercooler (2) has a first inlet, a first outlet, a second inlet and a second outlet, the heat exchanger (3) has a first heat exchange channel, the evaporator (4) has a second heat exchange channel and a third heat exchange channel capable of heat exchange, the first exhaust port is connected to the first inlet, the first outlet is connected to one end of the second heat exchange channel, the other end of the second heat exchange channel is connected to the first air intake port, the second outlet is connected to one end of the first heat exchange channel, the other end of the first heat exchange channel is connected to the second inlet through the one-way valve (6), the one-way valve (6) is used to conduct the flow from the first heat exchange channel to the intercooler (2), the heat exchanger (3) is connected to a target device for heat exchange, a fourth heat exchange channel is formed in the target device, and the circulation pump (5), the third heat exchange channel and the fourth heat exchange channel form a liquid cooling circulation loop.

2. The air conditioning system according to claim 1, characterized in that: The heat exchanger (3) further comprises a three-way valve, wherein the three-way valve has a first valve port (7), a second valve port (8) and a third valve port (9); the heat exchanger (3) also comprises a fifth heat exchange channel, wherein the first valve port (7) is connected to the first exhaust port, the second valve port (8) is connected to the first inlet, the third valve port (9) is connected to one end of the fifth heat exchange channel, and the other end of the fifth heat exchange channel is connected to the channel between the first outlet and the second heat exchange channel.

3. The air conditioning system according to claim 1, characterized in that: A fan is arranged outside the heat exchanger (3), and the heat exchanger (3) is located between the fan and the target device.

4. The air conditioning system according to claim 1, characterized in that: The second outlet is connected to one end of the first heat exchange channel through a control valve (10).

5. The air conditioning system according to claim 1, characterized in that: The liquid cooling circulation loop is provided with an electric heater (11), and the electric heater can heat the cooling liquid flowing in the liquid cooling circulation loop.

6. The air conditioning system according to any one of claims 1 to 5, characterized in that: It also includes a second compressor (12) and a condenser (13), wherein the second compressor (12) has a second air intake port and a second air exhaust port, the condenser (13) has a third inlet and a third outlet, and the intercooler (2) also has a fourth inlet and a fourth outlet, the second air exhaust port is connected to the third inlet, the third outlet is connected to the fourth inlet, and the fourth outlet is connected to the second air intake port.

7. A control method for an air conditioning system, characterized in that: Used to control the operation of the air conditioning system according to any one of claims 1 to 6, the control method comprising: Get the external temperature T; When T<T1, controlling the air conditioning system to operate in heating mode; When T1≤T<T2, controlling the air conditioning system to operate in the first cooling mode; When T≥T2, controlling the air conditioning system to operate in the second cooling mode; Wherein, T1 is a first preset temperature, T2 is a second preset temperature, and T2>T1.

8. The control method according to claim 7, characterized in that: When the air conditioning system includes a three-way valve, a fan and a control valve (10), the first cooling mode includes: controlling the first compressor (1) to start, controlling the first valve port (7) of the three-way valve to communicate with the second valve port (8), controlling the control valve (10) to open, controlling the fan to run, and controlling the circulation pump (5) to start.

9. The control method according to claim 7, characterized in that: When the air conditioning system includes a three-way valve, a fan and a control valve (10), the second cooling mode includes: controlling the first compressor (1) to start, controlling the first valve port (7) of the three-way valve to communicate with the second valve port (8), controlling the control valve (10) to close, controlling the fan to run, and controlling the circulation pump (5) to start.

10. The control method according to claim 8 or 9, characterized in that: When the air conditioning system further comprises a second compressor (12), the second compressor (12) is controlled to start.

11. The control method according to claim 8, characterized in that: When the air conditioning system includes a three-way valve, a fan and an electric heater (11), the heating mode includes: controlling the first compressor (1) to start, controlling the first valve port (7) of the three-way valve to communicate with the third valve port (9), controlling the fan to run, controlling the circulation pump (5) to start, and controlling the electric heater (11) to be energized.

12. An energy storage battery unit, characterized in that: It comprises the air conditioning system and an energy storage battery cabinet (14) as claimed in any one of claims 1 to 6, wherein the energy storage battery cabinet (14) is the target device.

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