Cooling system for energy storage device and energy storage device

Abstract

The application discloses a cooling system of an energy storage device and the energy storage device. The cooling system comprises a water side loop and a refrigerant loop. The water side loop comprises a first water flow path. The refrigerant loop comprises a compressor, a condenser connected with the compressor, a first heat exchanger comprising a first refrigerant flow path and a second water flow path, the first refrigerant flow path being connected with the compressor, the first refrigerant flow path being connected with a throttling element, the throttling element being connected with the condenser through a second refrigerant flow path, a pressure regulating valve connected in series on the second refrigerant flow path, a bypass flow path, one end of the bypass flow path being connected between the condenser and an exhaust port of the compressor, the other end of the bypass flow path being connected between the pressure regulating valve and the throttling element, and the bypass flow path being connected in series with a first control valve. Thus, by arranging the refrigerant loop, the cooling system can run smoothly under low-temperature refrigeration condition, the structure of the cooling system can be simplified, and the safety of the cooling system can be improved.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202111275092.0, filed on October 29, 2021, entitled "Cooling System for Energy Storage Device and Energy Storage Device", by Foshan Shunde Midea Electronics Technology Co., Ltd. and Guangdong Midea Refrigeration Equipment Co., Ltd. Technical Field

[0003] This invention relates to the field of energy storage devices, and more particularly to a cooling system for an energy storage device and an energy storage device having the cooling system thereon. Background Technology

[0004] With the rapid growth in the construction of energy storage devices, the safety issues of energy storage devices are becoming increasingly prominent. Energy storage devices need to operate in a reasonable temperature environment. Maintaining the working environment of energy storage devices, such as energy storage power stations, battery packs, and large computer rooms, at a reasonable temperature can prevent safety hazards and accidents from occurring, and can also ensure the stable operation of energy storage devices and achieve effective energy saving.

[0005] In related technologies, heat exchange is performed on energy storage devices through cooling systems. When the ambient temperature is low (e.g., -30°C), the compressor in the cooling system is in a low-pressure protection shutdown state due to the low temperature, preventing the system from operating normally. Existing cooling systems add a cooling loop, such as using radiators to cool the water. This adds a cooling loop, increasing the space required for the cooling system. Furthermore, it necessitates additional piping, radiators, and switching components (such as three-way valves), increasing the system's weight. The added components also increase the risk of leakage at joints, thus increasing the risk of electric shock from leaks and reducing the overall safety of the cooling system. Summary of the Invention

[0006] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a cooling system for an energy storage device, which can ensure smooth operation of the cooling system under low-temperature refrigeration conditions, and compared with the prior art, can also simplify the structure of the cooling system and improve the safety of the cooling system.

[0007] The present invention further proposes an energy storage device.

[0008] The cooling system of the energy storage device according to the present application comprises a water side loop and a refrigerant loop, the water side loop comprises a first water flow path for heat exchange with the energy storage device, and the refrigerant loop comprises a compressor, a condenser connected with an exhaust port of the compressor, a first heat exchanger comprising a first refrigerant flow path and a second water flow path for heat exchange with each other, a first end of the first refrigerant flow path being connected with a return air port of the compressor, a second end of the first refrigerant flow path being connected with a throttling element, the throttling element being connected with an outlet end of the condenser through a second refrigerant flow path, two ends of the second water flow path being connected with two ends of the first water flow path respectively to define the water side loop, a pressure regulating valve connected in series in the second refrigerant flow path, the pressure regulating valve being configured to open to conduct the second refrigerant flow path when detecting that a pressure difference in the second refrigerant flow path meets a set condition, and a bypass flow path, one end of the bypass flow path being connected between the condenser and the exhaust port of the compressor, the other end of the bypass flow path being connected between the pressure regulating valve and the throttling element to be connected in parallel with the condenser, the bypass flow path being connected in series with a first control valve for conducting or cutting off the bypass flow path.

[0009] The cooling system of the energy storage device according to the present application can ensure smooth operation of the cooling system under low-temperature refrigeration, can simplify the structure of the cooling system, and can improve the safety of the cooling system.

[0010] In some examples of the present application, the cooling system of the energy storage device further comprises a liquid storage tank, the liquid storage tank being connected in series in the second refrigerant flow path and the pressure regulating valve being located between the liquid storage tank and the condenser.

[0011] In some examples of the present application, the cooling system of the energy storage device further comprises a flow control valve connected in series in the water side loop to adjust the water flow of the water side water path.

[0012] In some examples of the present application, the cooling system of the energy storage device further comprises a heater with opening and closing functions, the heater being used to adjust the water temperature in the water side loop.

[0013] In some examples of the present application, the cooling system of the energy storage device further comprises a fan with adjustable rotating speed, the fan being used to dissipate heat from the condenser.

[0014] In some examples of the present application, the first heat exchanger is a plate heat exchanger, and the first control valve is a shut-off valve.

[0015] The energy storage device according to the present application comprises an energy storage device and a cooling system, the cooling system being the above-mentioned energy storage device, and the first water flow path being used for heat exchange with the energy storage device.

[0016] In some examples of the present application, the first water flow path is provided in the energy storage device.

[0017] In some examples of the present application, the energy storage device further comprises a housing, the compressor, the condenser and the first heat exchanger are respectively provided in the housing, and the second water flow path is connected with the first water flow path through a communication pipe penetrating out of the housing.

[0018] In some examples of the present application, the energy storage device is an energy storage power station or a battery pack.

[0019] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0021] Figure 1 is a schematic diagram of a cooling system according to an embodiment of the present application;

[0022] Figure 2 is a schematic diagram of a prior art cooling system.

[0023] REFERENCE NUMERALS

[0024] cooling system 100;

[0025] water side circuit 10; first water flow path 11;

[0026] refrigerant circuit 20; compressor 201; condenser 202; first heat exchanger 203; throttling element 204; second refrigerant flow path 205; pressure regulating valve 206; bypass flow path 207; first control valve 208;

[0027] liquid storage tank 30; flow control valve 40; heater 50; fan 60; water tank 70; electronic water pump 80;

[0028] energy storage device 200;

[0029] energy storage device 300. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals and letters indicate the same or functionally similar elements throughout the several views. The following detailed description is exemplary by nature and is intended to provide a factual description of the one or more embodiments of the present application rather than an exhaustive recitation of all possible embodiments.

[0031] In the description of the present application, it is to be understood by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the features defined with "first", "second" can be explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0032] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] The following refers to Figure 1 The cooling system 100 for cooling the energy storage device 200 is described according to the embodiment of the present application, so as to maintain the working environment of the energy storage device 200 in a reasonable temperature operating environment, thereby ensuring the working performance and safety of the energy storage device 200.

[0034] As Figure 1 As shown, according to the cooling system 100 of the embodiment of the present application, the cooling system 100 comprises a refrigerant circuit 20, and the cooling system 100 further comprises a water side circuit 10, the water side circuit 10 comprising a first water flow path 11, the first water flow path 11 being used for heat exchange with the energy storage device 200, and the first water flow path 11 being capable of taking away the heat of the energy storage device 200 when heat exchanging with the energy storage device 200, so as to achieve the purpose of cooling the energy storage device 200.

[0035] The refrigerant circuit 20 comprises a compressor 201, a condenser 202, a first heat exchanger 203, a pressure regulating valve 206 and a bypass flow path 207. The exhaust port of the compressor 201 is connected to the condenser 202, and further, the exhaust port of the compressor 201 is in communication with the condenser 202. The first heat exchanger 203 comprises a second water flow path and a first refrigerant flow path, and the second water flow path and the first refrigerant flow path exchange heat with each other. It can also be understood that heat can be transferred between the second water flow path and the first refrigerant flow path. Heat can be transferred from a high-temperature object to a low-temperature object. Specifically, when the temperature of the second water flow path is higher than the temperature of the first refrigerant flow path, heat can be transferred from the second water flow path to the first refrigerant flow path. When the temperature of the second water flow path is lower than the temperature of the first refrigerant flow path, heat can be transferred from the first refrigerant flow path to the second water flow path, so as to realize mutual heat exchange between the second water flow path and the first refrigerant flow path.

[0036] Further, the gas return port of the compressor 201 is connected to the first end of the first refrigerant flow path, and further, the gas return port of the compressor 201 is in communication with the first end of the first refrigerant flow path. The throttling element 204 is connected to the second end of the first refrigerant flow path. The throttling element 204 is connected to the outlet end of the condenser 202 through the second refrigerant flow path 205. The second refrigerant flow path 205 is in communication with the outlet end of the condenser 202. The two ends of the second water flow path are respectively connected to the two ends of the first water flow path 11 to define the water-side circuit 10. That is, one end of the second water flow path is in communication with one end of the first water flow path 11, and the other end of the second water flow path is in communication with the other end of the first water flow path 11. The second water flow path and the first water flow path 11 together define the water-side circuit 10.

[0037] Further, the pressure regulating valve 206 is arranged in series on the second refrigerant flow path 205. The pressure regulating valve 206 is configured to open to conduct the second refrigerant flow path 205 when detecting that the pressure difference in the second refrigerant flow path 205 meets a set condition. One end of the bypass flow path 207 is connected between the exhaust port of the compressor 201 and the condenser 202. The other end of the bypass flow path 207 is connected between the throttling element 204 and the pressure regulating valve 206. In this way, the bypass flow path 207 is connected in parallel with the condenser 202. The bypass flow path 207 is in series with a first control valve 208 for conducting or shutting off the bypass flow path 207.

[0038] As Figure 2As shown in the existing cooling system of the energy storage device, when the ambient temperature is in a low-temperature environment (for example, the ambient temperature is-30℃), the compressor of the cooling system is in a low-pressure protection shutdown state due to the low ambient temperature, and the system cannot operate normally at this time. The existing cooling system adds a cooling loop, such as using a radiator to cool, to achieve the purpose of cooling the water. This way increases a cooling loop, resulting in an increase in the occupied space of the cooling system, which requires a large space to set up the cooling system, and the corresponding pipeline, radiator, and switch components (such as a three-way valve) need to be increased, which increases the weight of the cooling system. At the same time, due to the increase in the corresponding parts, the risk of joint leakage between the parts is increased, thereby increasing the risk of electric shock caused by leakage of the cooling system, and reducing the safety of the cooling system.

[0039] Specifically, when the existing cooling system is in a high-temperature refrigeration mode, such as Figure 2 As shown, the compressor is started to compress the refrigerant, the compressor compresses the refrigerant into high-temperature and high-pressure gas, and then the high-temperature and high-pressure gas refrigerant flows into the condenser. The gaseous refrigerant is condensed into a medium-temperature and medium-pressure supercooled liquid refrigerant. The medium-temperature and medium-pressure supercooled liquid refrigerant flows through the liquid storage tank and is throttled by the throttling valve to become low-temperature and low-pressure two-phase state with low dryness. The two-phase refrigerant absorbs the heat of the water path of the energy storage device in the heat exchanger and becomes low-temperature and low-pressure superheated steam. The superheated steam from the heat exchanger returns to the compressor, completing a compression refrigeration cycle. The cooled energy storage device cooling liquid cools the energy storage device.

[0040] When the existing cooling system is in a low-temperature refrigeration mode, for example, when the ambient temperature is-30℃, the compressor is in a low-pressure protection shutdown state. As shown in Figure 2 The high-temperature water flows through the outdoor radiator through the three-way water valve, and the low-temperature water is cooled to low-temperature water by the combined action of the outdoor low temperature and the cooling fan. Then, the low-temperature water cools the energy storage device.

[0041] In the present application, when the cooling system 100 is in a high-temperature refrigeration mode, such as Figure 1As shown, the first control valve 208 is closed, the compressor 201 compresses the refrigerant, the compressor 201 discharges the high-temperature and high-pressure gas refrigerant, the high-temperature and high-pressure gas refrigerant flows into the condenser 202, the gaseous refrigerant in the condenser 202 is condensed into the medium-temperature and medium-pressure subcooled liquid refrigerant, the liquid refrigerant flows out of the condenser 202 and flows into the second refrigerant flow path 205, when the pressure difference in the second refrigerant flow path 205 meets the set condition, the pressure regulating valve 206 opens to guide the second refrigerant flow path 205, then the throttling element 204 is used to throttle and reduce the pressure to make the liquid refrigerant into the low-temperature and low-pressure two-phase state with low dryness, then the refrigerant changes phase in the first refrigerant flow path to absorb the heat of the second water flow path to become the low-temperature and low-pressure superheated steam, the superheated steam flowing out of the first refrigerant flow path flows into the compressor 201 through the gas return port of the compressor 201, and a compression refrigeration cycle is completed. The refrigerated cooling liquid in the second water flow path flows into the first water flow path 11, and the cooling liquid in the first water flow path 11 exchanges heat with the energy storage device 200 to cool the energy storage device 200.

[0042] Further, when the cooling system 100 is in the low-temperature refrigeration mode, the cooling system 100 has a first working process and a second working process. In the first working process, the cooling system 100 is started in the low-temperature working condition, because the external environment temperature is extremely low (such as -30°C), when the compressor 201 is just started, the pressure regulating valve 206 is closed to make the second refrigerant flow path 205 not guided, that is, the second refrigerant flow path 205 is closed, the first control valve 208 is opened, the superheated refrigerant flowing out of the exhaust port of the compressor 201 flows through the first control valve 208 and then flows through the throttling element 204, the throttling element 204 is used to throttle and reduce the pressure to make the refrigerant into the low-temperature and low-pressure two-phase state with low dryness, then the refrigerant changes phase in the first refrigerant flow path to absorb the heat of the second water flow path to become the low-temperature and low-pressure superheated steam, the superheated steam flowing out of the first refrigerant flow path flows into the compressor 201 through the gas return port of the compressor 201.

[0043] In the second working process, as the discharge pressure of the compressor 201 gradually rises, when the discharge pressure of the compressor 201 reaches the opening pressure difference of the pressure regulating valve 206, the second refrigerant flow path 205 is guided, the high-temperature and high-pressure superheated refrigerant is condensed into the medium-temperature and medium-pressure subcooled liquid phase refrigerant through the condenser 202, then the throttling element 204 is used to throttle and reduce the pressure to make the refrigerant into the low-temperature and low-pressure two-phase refrigerant with low dryness, the two-phase refrigerant changes phase in the first refrigerant flow path to absorb the heat of the second water flow path to become the low-temperature and low-pressure superheated steam, the superheated steam flowing out of the first refrigerant flow path flows into the compressor 201 through the gas return port of the compressor 201, and a compression refrigeration cycle is completed. The refrigerated cooling liquid in the second water flow path flows into the first water flow path 11, and the cooling liquid in the first water flow path 11 exchanges heat with the energy storage device 200 to cool the energy storage device 200.

[0044] It should be noted that when the cooling system 100 is in the low-temperature refrigeration mode, the cooling system 100 first works in the first working process, and then works in the second working process. In the present application, the over-switching from the small cycle to the large refrigeration cycle is realized by the cooperation of the pressure regulating valve 206 and the first control valve 208, which can ensure that the compressor 201 of the cooling system 100 can be normally started under the low-temperature refrigeration condition, can ensure that the cooling system 100 runs smoothly under the low-temperature refrigeration condition, and can also improve the reaction efficiency of the cooling system 100. Moreover, compared with the existing cooling system, the pressure regulating valve 206 and the first control valve 208 are added in the cooling system 100 of the present application, but the radiator, the three-way water valve and the redundant pipeline in the existing cooling system are reduced, which can simplify the waterway design of the cooling system 100, can reduce the volume of the cooling system 100, can reduce the space occupied by the cooling system 100, can also reduce the weight of the cooling system 100, and in addition, since the arrangement of the radiator and the three-way water valve is reduced, the risk of joint leakage between parts is reduced, thereby reducing the risk of electric shock caused by leakage of the cooling system 100, and improving the safety of the cooling system 100.

[0045] Therefore, by arranging the refrigerant circuit 20, the cooling system 100 can run smoothly under the low-temperature refrigeration condition, the structure of the cooling system 100 can be simplified, and the safety of the cooling system 100 can be improved.

[0046] In some embodiments of the present application, as shown in Figure 1 The cooling system 100 can further include a liquid storage tank 30, the liquid storage tank 30 being connected in series on the second refrigerant flow path 205, and the pressure regulating valve 206 being located between the liquid storage tank 30 and the condenser 202. Further, the pressure regulating valve 206 is connected between the condenser 202 and the liquid storage tank 30. After the liquid refrigerant flows out of the condenser 202, it flows into the second refrigerant flow path 205. When the pressure difference in the second refrigerant flow path 205 is detected to satisfy the set condition, the pressure regulating valve 206 opens to connect the second refrigerant flow path 205. The refrigerant flows through the pressure regulating valve 206 and then flows into the liquid storage tank 30. The refrigerant in the liquid storage tank 30 flows through the throttling element 204 and then flows into the first refrigerant flow path. The liquid storage tank 30 can store refrigerant, which can ensure that the refrigerant circuit 20 has sufficient refrigerant, thereby ensuring the working performance of the cooling system 100.

[0047] In some embodiments of the present application, as shown in Figure 1As shown, the cooling system 100 can further include a flow control valve 40 connected in series in the water-side circuit 10, and the flow control valve 40 can adjust the water flow in the water-side water circuit. By controlling the opening degree of the flow control valve 40, the water flow in the water-side water circuit can be adjusted. For example, when the temperature of the energy storage device 200 reaches a certain threshold value, the energy storage device 200 needs to be cooled quickly. At this time, by increasing the opening degree of the flow control valve 40, the water flow in the water-side water circuit per unit time is increased, more cooling liquid can be exchanged with the first refrigerant flow path, and the energy storage device 200 can be cooled quickly. When the temperature of the energy storage device 200 is less than a certain threshold value, the energy storage device 200 needs to be cooled. At this time, by adjusting the opening degree of the flow control valve 40, the water flow in the water-side water circuit per unit time is reduced, and the cooling liquid can be exchanged with the first refrigerant flow path to cool the energy storage device 200. At this time, the cooling liquid does not need to be too much to meet the cooling demand of the energy storage device 200.

[0048] In some embodiments of the present application, as shown in Figure 1 As shown, the cooling system 100 can further include a heater 50, which can be connected in series in the water-side circuit 10. The heater 50 has an opening and closing function, that is, the heater 50 can be turned on or off. When the heater 50 needs to work, the heater 50 is turned on, and when the heater 50 does not need to work, the heater 50 is turned off. The heater 50 is used to adjust the water temperature in the water-side circuit 10. Further, when the temperature of the energy storage device 200 is low (i.e., the temperature of the energy storage device 200 is lower than the reasonable temperature range value), and the water temperature in the water-side circuit 10 is low, the heater 50 is turned on to heat the cooling liquid in the water-side circuit 10, so that the temperature of the cooling liquid in the water-side circuit 10 is increased, thereby increasing the temperature of the energy storage device 200, and further making the temperature of the energy storage device 200 appropriate. When the temperature of the energy storage device 200 is high (i.e., the temperature of the energy storage device 200 is higher than the reasonable temperature range value), the heater 50 is turned off, and the cooling liquid in the second water flow path after heat exchange refrigeration flows into the first water flow path 11. The cooling liquid in the first water flow path 11 exchanges heat with the energy storage device 200 to cool the energy storage device 200.

[0049] In some embodiments of the present application, as shown in Figure 1 As shown, the cooling system 100 can further include a fan 60, and the rotating speed of the fan 60 is adjustable. When the fan 60 is turned on, the fan 60 is used to dissipate heat from the condenser 202. When the fan 60 is turned on, the fan 60 can blow air towards the condenser 202, which can rapidly speed up the phase change heat exchange process of the refrigerant in the condenser 202, and can quickly dissipate the heat of the condenser 202 to the external environment, thereby achieving rapid heat dissipation of the condenser 202, and further improving the heat exchange efficiency of the condenser 202 and the external environment.

[0050] In some embodiments of the present application, as shown in Figure 1 the first heat exchanger 203 can be provided as a plate heat exchanger, and the first control valve 208 can be provided as a stop valve. By providing the first heat exchanger 203 as a plate heat exchanger, the heat exchange area of the first heat exchanger 203 can be increased, and more heat can be exchanged between the second water flow path and the first refrigerant flow path per unit time, thereby ensuring the heat exchange efficiency of the first heat exchanger 203, and further ensuring the reasonable form of the first heat exchanger 203. Moreover, by providing the first control valve 208 as a stop valve, the working performance of the first control valve 208 can be ensured, and the working performance of the cooling system 100 can be ensured, thereby ensuring the working reliability of the cooling system 100.

[0051] The specific working process of the cooling system 100 will be described in detail below: Figure 1

[0052] When the cooling system 100 is in the high-temperature refrigeration mode, as shown in Figure 1 the first control valve 208 is closed, the compressor 201 compresses the refrigerant, the compressor 201 discharges the high-temperature and high-pressure gas refrigerant, and the high-temperature and high-pressure gas refrigerant flows into the condenser 202. The fan 60 rapidly speeds up the phase change heat exchange process of the refrigerant in the condenser 202, and brings heat to the air. The gaseous refrigerant in the condenser 202 is condensed into medium-temperature and medium-pressure supercooled liquid refrigerant. The liquid refrigerant flows out of the condenser 202 and flows into the second refrigerant flow path 205. When the pressure difference in the second refrigerant flow path 205 meets the set condition, the pressure regulating valve 206 opens to guide the second refrigerant flow path 205. Then the refrigerant flows into the liquid tank 30, and then the refrigerant in the liquid tank 30 flows through the throttling element 204 (throttle valve). The throttling element 204 throttles and reduces the pressure to make the liquid refrigerant into low-temperature and low-pressure two-phase state with low dryness. Then the refrigerant in the first refrigerant flow path changes into low-temperature and low-pressure superheated steam by absorbing heat from the second water flow path, and the superheated steam flows into the compressor 201 through the gas inlet of the compressor 201, completing a compression refrigeration cycle. The cooled liquid in the second water flow path flows into the first water flow path 11, and the cooled liquid in the first water flow path 11 exchanges heat with the energy storage device 200 to cool the energy storage device 200.

[0053] ​The cooling system 100 has a first working process and a second working process when the cooling system 100 is in the low-temperature refrigeration mode. In the first working process, the cooling system 100 is started in the low-temperature working condition. Since the ambient temperature is extremely low (for example, -30°C), in order to prevent the low-pressure protection of the compressor 201 and ensure that the cooling system 100 can normally operate, the opening pressure of the pressure regulating valve 206 is set to 7-10 bar, for example, the opening pressure of the pressure regulating valve 206 is set to 8 bar. After the compressor 201 is started, the pressure regulating valve 206 is closed to make the second refrigerant flow path 205 not conductive, that is, the second refrigerant flow path 205 is closed, and the first control valve 208 is opened. The overheated refrigerant flowing out of the exhaust port of the compressor 201 flows through the first control valve 208, and then flows through the liquid accumulator 30 and the throttling element 204 in sequence. The throttling element 204 is used to throttle and reduce the pressure, so that the refrigerant becomes low-temperature and low-pressure two-phase state with low dryness. Then, the refrigerant changes phase to absorb the heat of the second water flow path in the first refrigerant flow path to become low-temperature and low-pressure overheated steam. The overheated steam flowing out of the first refrigerant flow path flows into the compressor 201 through the gas return port of the compressor 201.

[0054] In the second working process, as the exhaust pressure of the compressor 201 gradually increases, when the exhaust pressure of the compressor 201 reaches the opening pressure difference of the pressure regulating valve 206, the second refrigerant flow path 205 is conductive. The overheated refrigerant with high temperature and high pressure is condensed into medium-temperature and medium-pressure subcooled liquid phase refrigerant through the condenser 202. Then, the refrigerant flows through the liquid accumulator 30 and the throttling element 204. The throttling element 204 is used to throttle and reduce the pressure, so that the refrigerant becomes low-temperature and low-pressure two-phase refrigerant with low dryness. The two-phase refrigerant changes phase to absorb the heat of the second water flow path in the first refrigerant flow path to become low-temperature and low-pressure overheated steam. The overheated steam flowing out of the first refrigerant flow path flows into the compressor 201 through the gas return port of the compressor 201, and a compression refrigeration cycle is completed. The cooling liquid in the second water flow path after being heat-exchanged and refrigerated flows into the first water flow path 11, and the cooling liquid in the first water flow path 11 exchanges heat with the energy storage device 200 to cool the energy storage device 200.

[0055] It should be noted that, as shown in Figure 1 The cooling system 100 can further include an electronic water pump 80 connected in series in the water side circuit 10. The electronic water pump 80 communicates with the water tank 70. The electronic water pump 80 can pump the water (that is, the cooling liquid) in the water tank 70 into the water side circuit 10. Further, the electronic water pump 80 can pump the water in the water tank 70 into the first water flow path 11, so as to ensure that the water side circuit 10 has sufficient cooling liquid. Further, the electronic water pump 80, the flow control valve 40, and the heater 50 are connected in series. Figure 1As shown, the cooling liquid cooled by heat exchange in the second water flow path is cooled in the loop formed by the first heat exchanger 203, the energy storage device 200, the electronic water pump 80, the flow control valve 40, and the heater 50, and the temperature of the energy storage device 200 is lowered.

[0056] The energy storage device 300 according to the embodiment of the present application comprises the energy storage device 200 and the cooling system 100. The cooling system 100 is used to cool the energy storage device 200 in the above embodiment, and the first water flow path 11 exchanges heat with the energy storage device 200. When the cooling system 100 is in the low-temperature refrigeration mode, the cooling system 100 works in the first working process first, and then works in the second working process. In the present application, the pressure regulating valve 206 and the first control valve 208 work together to realize the switching from the small cycle to the large refrigeration cycle, which can ensure that the compressor 201 of the cooling system 100 can be normally started under the low-temperature refrigeration condition, can ensure that the cooling system 100 runs smoothly under the low-temperature refrigeration condition, and can improve the reaction efficiency of the cooling system 100, thereby ensuring the working reliability of the energy storage device 300. Moreover, compared with the existing cooling system, the cooling system 100 of the present application adds the pressure regulating valve 206 and the first control valve 208, but reduces the radiator and the three-way water valve in the existing cooling system, which can simplify the water circuit design of the cooling system 100, reduce the volume of the cooling system 100, reduce the space occupied by the cooling system 100, and reduce the weight of the cooling system 100, thereby reducing the space and weight occupied by the energy storage device 300. In addition, since the radiator and the three-way water valve are reduced, the risk of joint leakage between parts is reduced, thereby reducing the risk of electric shock caused by leakage of the cooling system 100, improving the safety of the cooling system 100, and thereby improving the safety of the energy storage device 300.

[0057] In some embodiments of the present application, the first water flow path 11 is arranged in the energy storage device 200, which can make the first water flow path 11 contact the inside of the energy storage device 200, can make the first water flow path 11 quickly exchange heat with the energy storage device 200, and can improve the heat exchange efficiency between the first water flow path 11 and the energy storage device 200, thereby making the first water flow path 11 suitable in position. Moreover, by arranging the first water flow path 11 in the energy storage device 200, the first water flow path 11 can avoid occupying the space outside the energy storage device 200, which can further reduce the volume of the cooling system 100 and the volume of the energy storage device 300, thereby further reducing the space occupied by the energy storage device 300.

[0058] In some embodiments of the present application, the energy storage device 300 can further comprise a shell, the condenser 202, the compressor 201 and the first heat exchanger 203 are arranged in the shell respectively, and the second water flow path is connected with the first water flow path 11 through a communication pipe penetrating out of the shell. The shell has a protective effect on the condenser 202, the compressor 201 and the first heat exchanger 203, which can prevent the condenser 202, the compressor 201 and the first heat exchanger 203 from being damaged by external objects, thereby prolonging the service life of the condenser 202, the compressor 201 and the first heat exchanger 203, and further prolonging the service life of the energy storage device 300.

[0059] In some embodiments of the present application, the energy storage device 200 can be arranged as an energy storage power station or a battery pack, and the cooling system 100 can be used to cool the energy storage power station or the battery pack, so as to ensure the working temperature of the energy storage power station or the battery pack.

[0060] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means 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 the present application, the exemplary description of the above terms does 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.

[0061] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A cooling system for an energy storage device, characterized by, The cooling system comprises a water-side loop and a refrigerant loop, the water-side loop comprises a first water flow path in heat exchange with the energy storage device, and the refrigerant loop comprises: a compressor; a condenser connected to the exhaust port of the compressor; a first heat exchanger comprising a first refrigerant flow path and a second water flow path in heat exchange with each other, a first end of the first refrigerant flow path being connected to the return port of the compressor, a second end of the first refrigerant flow path being connected to a throttling element, the throttling element being connected to the outlet end of the condenser through a second refrigerant flow path, and two ends of the second water flow path being connected to two ends of the first water flow path respectively to define the water-side loop; a pressure regulating valve connected in series in the second refrigerant flow path, the pressure regulating valve being configured to open to conduct the second refrigerant flow path when detecting that a pressure difference in the second refrigerant flow path meets a set condition; a bypass flow path, one end of the bypass flow path being connected between the condenser and the exhaust port of the compressor, the other end of the bypass flow path being connected between the pressure regulating valve and the throttling element to be connected in parallel with the condenser, and the bypass flow path being connected in series with a first control valve for conducting or shutting off the bypass flow path.

2. The cooling system of an energy storage device according to claim 1, wherein, Further comprising a liquid storage tank connected in series in the second refrigerant flow path and the pressure regulating valve being located between the liquid storage tank and the condenser.

3. The cooling system of an energy storage device according to claim 1, wherein, Further comprising a flow control valve connected in series in the water-side loop to adjust the water flow of the water-side loop.

4. The cooling system of an energy storage device according to claim 1, wherein, Further comprising a heater with opening and closing functions, the heater being used to adjust the water temperature in the water-side loop.

5. The cooling system of an energy storage device according to claim 1, wherein, Further comprising a fan with adjustable rotating speed, the fan being used to dissipate heat from the condenser.

6. The cooling system of an energy storage device according to claim 1, wherein, The first heat exchanger is a plate heat exchanger, and the first control valve is a shut-off valve.

7. An energy storage device, characterized by, Comprise: an energy storage device; a cooling system according to any one of claims 1-6, the first water flow path being in heat exchange with the energy storage device.

8. The energy storage device of claim 7, wherein, The first water flow path is arranged in the energy storage device.

9. The energy storage device according to claim 8, further comprising a housing, the compressor, the condenser and the first heat exchanger being arranged in the housing respectively, and the second water flow path being connected to the first water flow path through a communication pipe penetrating out of the housing.

10. The energy storage device of claim 7, wherein, The energy storage device is an energy storage power station or a battery pack.

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