Air conditioning system and energy storage system

Abstract

The utility model provides an air conditioning system and an energy storage system. The air conditioning system is used for heating or cooling a battery pack, the air conditioning system comprises a controller, a compressor and a throttle valve, the battery pack comprises a battery cold plate, the battery cold plate is provided with a heat exchange pipeline, the heat exchange pipeline comprises an input port and an output port, an exhaust port of the air conditioning system is connected with the input port, and an exhaust port of the air conditioning system is connected with the output port. An air return port of the air conditioning system is connected with an output port of the battery cold plate, the throttle valve is arranged between the exhaust port and the input port, and the controller is used for controlling the compressor to operate and adjusting the opening degree of the throttle valve to be 0 and controlling the throttle valve to be opened when the pressure of the air return port of the compressor is lower than preset pressure. And the compressor is controlled to stop running. The fault maintenance efficiency of the energy storage system can be improved.

Description

Technical Field

[0001] This application relates to the technical field of energy storage using air conditioning technology, and particularly to an air conditioning system and an energy storage system. Background Art

[0002] Temperature control of the energy storage system is a key measure to prevent capacity decay, life decay, and thermal runaway of the energy storage system. Currently, the mainstream temperature control solutions for energy storage batteries are liquid cooling and compression refrigeration / PTC (Positive Temperature Coefficient Thermistor) heating. This solution has problems of low heat exchange efficiency in two times and high cost. With the further improvement of the energy / power density of energy storage batteries and the increasing requirements for the volume and performance of auxiliary equipment, direct cooling technology has been increasingly valued by the energy storage industry.

[0003] The energy storage system is becoming more and more portable. In the case of a failure of the energy storage system, quickly and conveniently repairing or replacing the faulty components is an effective way to improve the after-sales experience of the energy storage system. Therefore, there is an urgent need for a solution to improve the fault repair efficiency of the energy storage system. Summary of the Invention

[0004] Embodiments of this application provide an air conditioning system and an energy storage system, which can improve the fault repair efficiency of the energy storage system.

[0005] Embodiments of this application provide an air conditioning system. The air conditioning system is used to heat or cool a battery pack. The air conditioning system includes a controller, a compressor, and a throttle valve. The battery pack includes a battery cold plate, and the battery cold plate is provided with a heat exchange pipeline. The heat exchange pipeline includes an input port and an output port. The exhaust port of the air conditioning system is connected to the input port, the return air port of the air conditioning system is connected to the output port of the battery cold plate, the throttle valve is arranged between the exhaust port and the input port, and the controller is used to control the operation of the compressor and adjust the opening of the throttle valve to 0, and control the compressor to stop operating when the pressure at the return air port of the compressor is lower than a preset pressure.

[0006] Embodiments of this application provide an energy storage system. The energy storage system includes the above-mentioned air conditioning system and a battery pack.

[0007] The air conditioning system and energy storage system of the present application. The air conditioning system can heat or cool the battery pack. When the battery pack fails and needs to be replaced, the air conditioning system will be controlled to operate first, and the opening of the throttle valve between the exhaust port of the air conditioning system and the input port of the battery cold plate will be adjusted to 0. As the air conditioner operates, the refrigerant in the heat exchange pipeline of the battery cold plate gradually flows from the output port of the battery cold plate to the suction port, thereby recovering the refrigerant in the battery pack to be repaired and storing the refrigerant in the part outside the heat exchange pipeline in the refrigerant pipeline. As the refrigerant in the heat exchange pipeline is gradually emptied and the throttle valve is closed, the pressure at the suction port (such as the suction port of the compressor) will gradually decrease. When the pressure at the suction port of the compressor is less than the preset pressure (an empirical value corresponding to the suction port pressure when the refrigerant is evacuated), it can be determined at this time that the refrigerant in the heat exchange pipeline has been recovered. After the refrigerant in the heat exchange pipeline is recovered, the faulty battery pack can be replaced. At this time, there is basically no refrigerant in the faulty battery pack. After the new battery pack is installed, since the refrigerant has been recovered into the pipeline of the air conditioning system, there is no need to refill the refrigerant at this time. After the air conditioning system operates, the refrigerant in the pipeline of the air conditioning system flows through the exhaust port of the air conditioning system into the heat exchange pipeline, thereby quickly realizing the repair of the battery pack. Since the time-consuming processes of evacuating the refrigerant and refilling the refrigerant are saved, the repair efficiency of the battery pack is greatly improved.

[0008] Additional aspects and advantages of the embodiments of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0010] Figure 1 is a schematic structural diagram of the energy storage system of some embodiments of the present application;

[0011] Figure 2 is a schematic structural diagram of the battery pack of some embodiments of the present application;

[0012] Figure 3 is a schematic connection diagram of the battery pack and the air conditioning system of some embodiments of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the embodiments of the present application and should not be construed as limiting the embodiments of the present application.

[0014] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0015] In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one feature. In the description of this application, the meaning of "a plurality" is at least two, such as two or three, unless otherwise clearly and specifically defined.

[0016] For the convenience of description, the application scenarios of this application will be introduced first below. The application scenarios include an energy storage system 1000, and the energy storage system 1000 includes a battery pack 201 and an air conditioning system 100 for heating or cooling the battery pack 201.

[0017] Among them, the battery pack 201 (Battery Pack) refers to a device that combines one or more battery cells (Cell) with necessary electronic replacement devices. It is widely used in various fields such as various portable electronic products, power tools, electric vehicles, and the energy storage system 1000. The battery pack 201 not only includes battery cells, but also includes components such as a protection circuit, a temperature sensor, and a voltage equalization circuit to ensure the safe use of the battery and extend its service life.

[0018] Optionally, the battery pack 201 includes a plurality of them, and the plurality of battery packs 201 form a battery module 200, and the energy storage system 1000 is powered by the battery module 200.

[0019] Optionally, the battery pack 201 includes a battery cold plate 202. The battery cold plate 202 (Battery Cooling Plate) is a key component for the thermal management of battery packs, especially in electric vehicles (EV), hybrid electric vehicles (HEV), and the energy storage system 1000. Its main function is to effectively remove the excess heat generated during the operation of the battery through heat conduction and convection, so as to maintain the battery pack within a suitable operating temperature range to ensure the performance and life of the battery. The battery cold plate 202 is usually installed at the bottom or side of the battery module, and through close contact with the battery module, using its good heat conduction performance, to achieve heat transfer between the battery and other media, such as heat dissipation or heating.

[0020] Optionally, the battery pack 201 includes a battery body 203, a battery cold plate 202, and a heat exchange pipe 204. One surface of the battery cold plate 202 is provided with the battery body 203, and the other surface is provided with the heat exchange pipe 204. The battery body 203 exchanges heat with the heat exchange pipe 204 through the battery cold plate 202.

[0021] Battery Heating can be to heat the battery by external means to improve the performance of the battery in a low-temperature environment. Under low-temperature conditions, the chemical reaction rate of the battery slows down, the internal resistance increases, resulting in a decrease in battery capacity and weakening of performance. Therefore, battery heating technology is particularly important in electric vehicles, drones, portable electronic devices, and other applications that need to work in a low-temperature environment.

[0022] Battery heat dissipation is because overheating of the battery not only causes the battery to discharge too fast, but also there are safety hazards when using the battery under extreme temperature conditions. For example, too high a temperature may cause the phenomenon of thermal runaway of lithium batteries, that is, the so-called "thermal escape", which may further lead to fires or even explosions.

[0023] Therefore, when the energy storage system 1000 is running, the battery pack 201 always needs to be maintained within a suitable temperature range to ensure the performance and safety of the battery pack 201.

[0024] The air-conditioning system 100 refers to a system composed of various components for regulating temperature. It controls the state of the air through a series of complex mechanical and electronic components so that the target object to be heated or cooled (such as the battery pack 201) is always maintained near the set target temperature. The air-conditioning system 100 includes:

[0025] Compressor 10: This is the heart of the air conditioner, responsible for compressing the refrigerant from a low-pressure gas into a high-temperature and high-pressure gas.

[0026] Outdoor heat exchanger 20: In the outdoor unit, the condenser receives the high-temperature and high-pressure gas from the compressor 10 and dissipates its heat to the external air through the heat sink, causing the refrigerant to cool and liquefy. Among them, the outdoor heat exchanger 20 is generally equipped with a fan to promote air flow and help the heat exchange process to be more efficient.

[0027] Regenerator 30: Used to exchange heat between the exhaust gas and the return gas, which can heat the temperature of the return gas back to the compressor 10, thereby improving the performance of the compressor 10 and further improving the heating and cooling efficiency of the air-conditioning system 100.

[0028] Control system: It includes various sensors and a controller 40. The controller 40 obtains different types of status information of the air conditioning system 100 based on the sensors, and thus controls the air conditioning system 100 based on the status information to ensure the performance of the air conditioning system 100. For example, through a thermostat and other sensors, the required temperature is set, and the operating status of the air conditioner is automatically adjusted according to the actual situation so that the temperature is always near the set temperature.

[0029] In some embodiments, the air conditioning system 100 further includes a four-way valve 50. The four-way valve 50 can adaptively adjust the connection relationship of the pipelines based on the operating mode of the air conditioner (such as the cooling mode and the heating mode), so as to achieve cooling or heating. Taking the air conditioning system 100 for heating or cooling the battery pack 201 as an example, in the cooling mode, the exhaust port of the compressor 10, the outdoor heat exchanger 20, the battery pack 201, and the suction port of the compressor 10 are connected in sequence; in the heating mode, the exhaust port of the compressor 10, the heat exchange pipeline 204 of the battery pack 201, the outdoor heat exchanger 20, and the suction port of the compressor 10 are connected in sequence.

[0030] In some embodiments, the air conditioning system 100 further includes a check valve 60. The check valve 60 is arranged between the exhaust port of the compressor 10 and the four-way valve 50, so that after the refrigerant discharged from the exhaust port of the compressor 10 enters the subsequent pipeline, it cannot flow back to the compressor 10 through the four-way valve 50 again.

[0031] In some embodiments, the air conditioning system 100 further includes a throttle valve 70. The throttle valve 70 is arranged between the exhaust port of the air conditioning system 100 and the input port of the heat exchange pipeline 204. The throttle valve 70 is used to adjust the refrigerant flow rate entering the heat exchange pipeline 204. When the supercooling degree of the battery cold plate 202 of the battery pack 201 is too high, by adjusting the opening degree of the throttle valve 70 (such as reducing the opening degree), the supercooling degree of the battery cold plate 202 of the battery pack 201 is reduced; when the supercooling degree of the battery cold plate 202 of the battery pack 201 is too low, by adjusting the opening degree of the throttle valve 70 (such as increasing the opening degree), the supercooling degree of the battery pack 201 is increased, so that the supercooling degree of the battery cold plate 202 is always within a reasonable range, ensuring the heating and cooling performance of the battery pack 201.

[0032] Among them, the exhaust port of the air conditioning system 100 is connected to the input port of the heat exchange pipeline 204 of the battery pack 201, and the return air port of the air conditioning system 100 is connected to the output port of the heat exchange pipeline 204 of the battery pack 201. In the refrigeration mode and the heating mode, the exhaust port and the return air port of the air conditioning system 100 are different. In the refrigeration mode, the exhaust port of the compressor 10, the outdoor heat exchanger 20, the battery pack 201, and the return air port of the compressor 10 are connected in sequence. The exhaust port of the air conditioning system 100 is the output port of the outdoor heat exchanger 20, and the return air port of the air conditioning system 100 is the return air port of the compressor 10. In the heating mode, the exhaust port of the compressor 10, the heat exchange pipeline 204 of the battery pack 201, the outdoor heat exchanger 20, and the return air port of the compressor 10 are connected in sequence. The exhaust port of the air conditioning system 100 is the exhaust port of the compressor 10, and the return air port of the air conditioning system 100 is the input port of the outdoor heat exchanger 20.

[0033] Optionally, the throttle valves 70 correspond to the battery packs 201 one by one, that is, the input port of the throttle valve 70 is connected to the exhaust port of the air conditioning system 100, and the output port of the throttle valve 70 is connected to the input port of the corresponding heat exchange pipeline 204 of the battery pack 201. That is, each throttle valve 70 independently adjusts the subcooling degree of the corresponding battery pack 201 to ensure the heating and heat dissipation performance of each battery pack 201. Alternatively, each throttle valve 70 corresponds to multiple battery packs 201, that is, the input port of the throttle valve 70 is connected to the exhaust port of the air conditioning system 100, and the output port of the throttle valve 70 is simultaneously connected to the input ports of the heat exchange pipelines 204 of multiple battery packs 201, so as to simultaneously control the refrigerant flow rate of the heat exchange pipelines 204 of the connected multiple battery packs 201, which can save costs.

[0034] This application takes the heat dissipation performance of the energy storage system 1000 as an example to give priority to ensuring the heat dissipation effect of the battery pack 201. At this time, the throttle valve 70 is arranged between the output port of the outdoor heat exchanger 20 and the input port of the heat exchange pipeline 204.

[0035] In some embodiments, the air conditioning system 100 further includes a pressure sensor 80, and the pressure sensor 80 can be arranged at the return air port of the compressor 10 to detect the return air pressure at the return air port of the compressor 10.

[0036] The air conditioning system 100 includes a compressor 10, an outdoor heat exchanger 20, and a regenerator 30. When the air conditioning system 100 is in the refrigeration mode, the compressor 10, the outdoor heat exchanger 20, and the throttle valve 70 are connected in sequence. The regenerator 30 includes a first regenerative pipeline 31 and a second regenerative pipeline 32. The first regenerative pipeline 31 is located between the outdoor heat exchanger 20 and the exhaust port, and the second regenerative pipeline 32 is located between the return air port and the compressor 10.

[0037] In some embodiments, the air conditioning system 100 further includes a regenerator 30. When the air conditioning system 100 is in the cooling mode, the compressor 10, the outdoor heat exchanger 20, and the throttle valve 70 are connected in sequence. The regenerator 30 includes a first regenerative pipe 31 and a second regenerative pipe 32. The first regenerative pipe 31 is located between the outdoor heat exchanger 20 and the exhaust port, and the second regenerative pipe 32 is located between the suction port and the compressor 10.

[0038] In this way, through the regenerator 30, heat exchange is achieved between the first regenerative pipe 31 and the second regenerative pipe 32, thereby realizing heat exchange between the exhaust pipe and the suction pipe, increasing the temperature of the refrigerant returning to the compressor 10, and improving the performance of the compressor 10.

[0039] In the cooling mode, since the regenerator 30 is arranged behind the outdoor heat exchanger 20, the outdoor heat exchanger 20 can convert the high-temperature and high-pressure gas output by the compressor 10 into saturated liquid. Compared with the relatively large volume occupied by the liquid state, using saturated liquid regeneration enables the volume of the regenerator 30 to be set smaller. The two-phase state (gas plus liquid) flowing out of the heat exchange pipe 204 of the battery pack 201 is heated to superheated gas through the first regenerative pipe 31. Compared with the compressor 10 compressing the two-phase refrigerant, the compressor 10 directly compresses the high-temperature gas to obtain high-temperature and high-pressure gas, which can improve the performance of the compressor 10.

[0040] In the heating mode, the high-temperature and high-pressure gas flowing out of the compressor 10 is cooled to a two-phase refrigerant by the first regenerative pipe 31, thereby using the two-phase refrigerant to heat the battery pack 201, and both the heating uniformity and effect are better.

[0041] Next, the technical background of the present application will be described again:

[0042] In the maintenance of the energy storage system 1000, faults in the battery pack 201 are relatively common. In the case of a fault in the battery pack 201, generally, a new battery pack 201 will be directly replaced, and the faulty battery pack 201 will be returned to the factory for repair. However, when replacing components related to the refrigerant, the refrigerant needs to be discharged first before replacement, and then the system needs to be evacuated and refilled with refrigerant. The entire maintenance process takes a long time. Therefore, when maintaining components related to the refrigerant (such as fluorine), such as the battery pack 201, in the energy storage system 1000, it is necessary to focus on solving the problem of the long maintenance time caused by discharging and refilling the refrigerant during after-sales maintenance.

[0043] Please refer to again Figure 1 , the controller of the air conditioning system according to the embodiment of the present application is used to control the operation of the compressor and adjust the opening of the throttle valve to 0, and when the pressure at the suction port of the compressor is lower than the preset pressure, control the compressor to stop running.

[0044] Specifically, when the air-conditioning system is operating, the refrigerant will flow along the pipeline. Due to the position setting of the throttle valve, after the opening of the throttle valve is adjusted to 0, the refrigerant in the pipeline before the throttle valve (taking the direction of the refrigerant flowing from the outlet of the air-conditioning system to the throttle valve as an example, the outdoor heat exchanger is located before the throttle valve) cannot flow to the heat exchange pipeline, while the refrigerant in the heat exchange pipeline flows out from the outlet of the heat exchange pipeline under the operation of the compressor and flows to the suction port of the air-conditioning system. The refrigerant in the heat exchange pipeline sequentially passes through the outlet of the heat exchange pipeline, the suction port of the air-conditioning system, the compressor and the check valve. Due to the restriction of the check valve, the refrigerant cannot flow back, so it is stored between the check valve and the throttle valve, realizing the recovery of the refrigerant in the heat exchange pipeline.

[0045] In this way, there is no need to discharge the refrigerant. Just adjust the opening of the throttle valve to 0 while the air-conditioning system is running normally. Moreover, since the refrigerant in the heat exchange pipeline of the battery pack to be replaced is recovered into the pipeline of the air-conditioning system, after the new battery pack is installed, there is no need to refill the refrigerant again, thus saving the time for discharging and refilling the refrigerant, and there is no need for manual operation. The automatic recovery of the refrigerant can be realized through the controller of the air-conditioning system.

[0046] Optionally, the opening of the throttle valve corresponding to the faulty battery pack can be adjusted to 0. Taking the number of battery packs as n and the throttle valve corresponding to the faulty battery pack one by one as an example, when recovering the refrigerant, the refrigerant of the faulty battery pack will be recovered, while the refrigerant of other battery packs circulates normally along the refrigerant flow direction. At this time, the preset pressure for judging whether the refrigerant of the faulty battery pack has been completely recovered can be determined based on the suction port pressure when there is refrigerant in n - 1 heat exchange pipelines.

[0047] Optionally, the heat exchange pipelines of each battery pack are connected in parallel between the exhaust port and the suction port of the air-conditioning system. If only the opening of the throttle valve corresponding to the heat exchange pipeline of the faulty battery pack is adjusted to 0 to recover the refrigerant of this faulty battery pack, the recovered refrigerant will flow through other throttle valves and then into the heat exchange pipelines of other battery packs and flow to the suction port of the air-conditioning system again. Even if the refrigerant of this faulty battery pack has been completely recovered, the pressure difference of the suction port when there is refrigerant in all n heat exchange pipelines (such as when the number of battery packs is n) and when there is refrigerant in n - 1 heat exchange pipelines is relatively small, and it may be difficult to accurately judge whether the refrigerant in the faulty battery pack has been completely recovered. Therefore, the opening of all throttle valves can be adjusted to 0, so as to realize the recovery of the refrigerant in the heat exchange pipelines of all battery packs. At this time, the preset pressure for judging whether the refrigerant of the faulty battery pack has been completely recovered can be determined based on the suction port pressure when there is no refrigerant in all n heat exchange pipelines.

[0048] As the air conditioner operates, the refrigerant in the heat exchange pipeline of the battery cold plate gradually flows from the outlet of the battery cold plate to the suction port, thereby recovering the refrigerant in the repaired battery pack and storing the refrigerant in the pipeline of the air conditioning system. As the refrigerant in the heat exchange pipeline is gradually emptied and the throttle valve is closed, the pressure at the suction port will gradually decrease. When the pressure at the suction port is less than the preset pressure (an empirical value corresponding to the suction port pressure when the refrigerant is evacuated), it can be determined at this time that the refrigerant in the heat exchange pipeline has been recovered.

[0049] After the refrigerant recovery in the heat exchange pipeline is completed, the faulty battery pack can be replaced. At this time, there is basically no refrigerant in the faulty battery pack. After the new battery pack is installed, since the refrigerant has been recovered into the pipeline of the air conditioning system, there is no need to refill the refrigerant at this time. After the air conditioning system operates, the refrigerant in the pipeline of the air conditioning system flows through the exhaust port of the air conditioning system into the heat exchange pipeline, thereby quickly realizing the repair of the battery pack and enabling the energy storage system to operate normally. In this way, the replacement efficiency of the battery pack can be improved.

[0050] Optionally, the energy storage system includes a battery module, and the battery module includes a plurality of battery packs. The inlets of the heat exchange pipelines corresponding to each battery pack are all connected to the exhaust port, and the outlets are all connected to the suction port.

[0051] Specifically, when replacing the faulty battery pack, the faulty battery pack can be disassembled separately and then replaced with a normal battery pack and installed, with a relatively low replacement cost. Or, due to the integrity of the battery module, replacing a single battery pack may cause abnormalities in the performance or operation of the battery module. Generally, the whole battery module will be replaced. The battery module containing the faulty battery pack can also be replaced as a whole. The battery module is disassembled and then a normal battery module composed of normal battery packs is installed.

[0052] Optionally, please refer to Figure 2 and Figure 3 , Figure 2 is a schematic structural diagram of the battery pack, Figure 3 is a schematic structural diagram when the battery pack is connected to the air conditioning system. The battery pack 201 includes a first self-locking valve 205 and a second self-locking valve 206. Both the first self-locking valve 205 and the second self-locking valve 206 include a male end and a female end; one of the male end and the female end of the first self-locking valve 205 is arranged at the exhaust port of the air conditioning system, and the other is arranged at the inlet of the heat exchange pipeline of the battery pack; one of the male end and the female end of the second self-locking valve 206 is arranged at the suction port of the air conditioning system, and the other is arranged at the inlet of the heat exchange pipeline of the battery pack; by disconnecting the connection between the male end and the female end of the first self-locking valve 205 and the connection between the male end and the female end of the second self-locking valve 206, the faulty battery pack 201 can be disassembled.

[0053] Among them, the self-locking valve is a valve with a special design that can maintain its open or closed state without an external power source. For example, the self-locking valve can be a mechanical self-locking valve (relying on physical mechanisms such as spring force or gravity to achieve the self-locking function), an electromagnetic self-locking valve (using an electromagnet to generate a magnetic field to attract or repel internal components to control the position of the valve), or a pneumatic / hydraulic self-locking valve (using compressed air or liquid as the driving medium).

[0054] The self-locking valve includes a male end and a female end. The male end and the female end can be screwed together, snapped together, glued, etc. When the male end and the female end are connected together, the self-locking valve conducts, and when the male end and the female end are disconnected, the valve self-locks and the self-locking valve shuts off.

[0055] In this way, when disassembling the faulty battery pack, disconnecting the connection between the male end and the female end of the first self-locking valve 205 and the connection between the male end and the female end of the second self-locking valve 206 can self-lock the faulty battery pack and the exhaust port and return air port of the air conditioning system, further preventing the refrigerant from flowing back to the faulty battery pack and avoiding the problem of insufficient refrigerant after replacing the battery pack.

[0056] Optionally, please refer to Figure 2 again. The battery pack 201 further includes an air extraction valve 207. A three-way valve can be provided at the input port or output port of the heat exchange pipeline, which is respectively connected to the input port or output port of the heat exchange pipeline, the male end or the female end of the self-locking valve, and the air extraction valve 207.

[0057] In this way, the gas in the heat exchange pipeline can be extracted through the air extraction valve 207 to achieve the vacuum pumping operation of the heat exchange pipeline, preventing air from existing in the normal battery pack used to replace the faulty battery pack and mixing with the refrigerant, which affects the operation of the air conditioning system, so that basically only the refrigerant exists in the pipeline of the air conditioning system, ensuring the refrigeration and heating performance of the air conditioning system.

[0058] Optionally, the air extraction valve 207 can be a needle valve. A needle valve is a precision control valve mainly used to precisely control the flow rate of fluids. Its name comes from the slender conical valve stem used in its internal design. The tip of this valve stem is shaped like a needle tip, so it is named "needle valve". When fully closed, the needle valve can provide a good sealing effect, reducing the possibility of leakage. Therefore, after vacuum pumping, the needle valve can be fully closed to prevent air from entering the normal battery pack.

[0059] In the air conditioning system and energy storage system according to the embodiments of the present application, the air conditioning system can heat or cool the battery pack. When the battery pack fails and needs to be replaced, the air conditioning system will be controlled to operate first, and the opening degree of the throttle valve between the exhaust port of the air conditioning system and the input port of the battery cold plate will be adjusted to 0. As the air conditioner operates, the refrigerant in the heat exchange pipeline of the battery cold plate gradually flows from the output port of the battery cold plate to the suction port, so as to recover the refrigerant in the faulty battery pack to be repaired and store the refrigerant in the part outside the heat exchange pipeline in the refrigerant pipeline. As the refrigerant in the heat exchange pipeline is gradually emptied and the throttle valve is closed, the pressure at the suction port will gradually decrease. When the pressure at the suction port is less than the preset pressure (an empirical value corresponding to the suction port pressure when the refrigerant is evacuated), it can be determined at this time that the refrigerant in the heat exchange pipeline has been completely recovered. After the refrigerant in the heat exchange pipeline is recovered, the faulty battery pack can be replaced. At this time, there is basically no refrigerant in the faulty battery pack. After the new battery pack is installed, since the refrigerant has been recovered into the pipeline of the air conditioning system, there is no need to refill the refrigerant at this time. After the air conditioning system operates, the refrigerant in the pipeline of the air conditioning system flows through the exhaust port of the air conditioning system into the heat exchange pipeline, so as to quickly repair the battery pack. Since the time-consuming processes of evacuating the refrigerant and refilling the refrigerant are saved, the repair efficiency of the battery pack is greatly improved.

[0060] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples" or "some examples", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0061] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

Claims

1. An air conditioning system, characterized in that, For heating or cooling a battery pack, the air conditioning system includes a controller, a compressor, and a throttle valve. The battery pack includes a battery cold plate, and the battery cold plate is provided with a heat exchange pipeline. The heat exchange pipeline includes an inlet and an outlet. The exhaust port of the air conditioning system is connected to the inlet, and the return air port of the air conditioning system is connected to the outlet of the battery cold plate. The throttle valve is arranged between the exhaust port and the inlet. The controller is used to control the operation of the compressor and adjust the opening degree of the throttle valve to 0, and when the pressure at the return air port of the compressor is lower than a preset pressure, control the compressor to stop operating.

2. The air conditioning system according to claim 1, characterized in that, There are multiple battery packs and multiple throttle valves, and at least one throttle valve is connected to the heat exchange pipeline of one battery pack.

3. The air-conditioning system according to claim 1, characterized in that, The air conditioning system further includes a check valve, and the check valve is located between the compressor and the exhaust port. The conducting direction of the check valve is from the compressor to the exhaust port.

4. The air conditioning system according to claim 1, wherein The air conditioning system further includes a pressure sensor, and the pressure sensor is arranged at the return air port of the compressor.

5. The air-conditioning system according to claim 1, characterized in that, The air conditioning system further includes an outdoor heat exchanger and a regenerator. When the air conditioning system is in the cooling mode, the compressor, the outdoor heat exchanger, and the throttle valve are connected in sequence. The regenerator includes a first regenerative pipeline and a second regenerative pipeline. The first regenerative pipeline is located between the outdoor heat exchanger and the exhaust port of the air conditioning system, and the second regenerative pipeline is located between the return air port of the air conditioning system and the compressor.

6. An energy storage system, characterized in that, An air conditioning system and a battery pack according to any one of claims 1-4 are included.

7. The energy storage system according to claim 6, wherein The battery pack includes a first self-locking valve and a second self-locking valve. Both the first self-locking valve and the second self-locking valve include a male end and a female end; one of the male end and the female end of the first self-locking valve is arranged at the exhaust port, and the other is arranged at the inlet; one of the male end and the female end of the second self-locking valve is arranged at the return air port, and the other is arranged at the inlet.

8. The energy storage system according to claim 7, wherein The battery pack further includes an air extraction valve. A three-way valve is arranged on the heat exchange pipeline of the battery pack, and the three-way valve is respectively connected to the heat exchange pipeline, the first self-locking valve or the second self-locking valve, and the air extraction valve.

9. The energy storage system according to claim 8, wherein The air extraction valve includes a needle valve.

10. The energy storage system according to claim 6, characterized in that, There are multiple battery packs, and the multiple battery packs form a battery module. The inlets of the heat exchange pipelines corresponding to each battery pack are all connected to the exhaust port of the air conditioning system, and the outlets are all connected to the return air port of the air conditioning system.

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