Energy storage systems and photovoltaic energy storage systems

Abstract

The application discloses an energy storage system and a photovoltaic energy storage system, and belongs to the technical field of energy storage. The energy storage system comprises a refrigeration circuit, an energy storage battery, a first flow path, electronic devices, a second flow path, a radiator, a valve group, a water collecting groove and a spraying device. The valve group is connected with the second path of the condenser, the second path of the first evaporator, the first flow path, the second flow path and the radiator respectively. The water collecting groove is located below the second evaporator along the direction of gravity and is used for collecting and storing condensed water. The spraying device is communicated with the water collecting groove and is suitable for spraying toward the radiator. The structure is used for collecting and recycling the condensed water, enhancing the heat exchange capacity of the radiator, realizing independent dehumidification, extracting part of the refrigerant for synchronous dehumidification, meeting the heat management demand and the dehumidification demand, increasing the practicability and the use width of the energy storage system, reducing the volume of the liquid cooling unit, improving the space utilization of the energy storage system, realizing multiple heat management modes and improving the comprehensive use performance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy storage, and particularly relates to an energy storage system and a photovoltaic energy storage system. BACKGROUND

[0002] With the rapid development of renewable energy and distributed energy technologies, the performance and efficiency of energy storage systems as a key link in energy storage and regulation are increasingly valued. In a humid environment, the internal space of the energy storage system is prone to accumulate moisture, which affects the insulation performance and electrical safety of the equipment. Therefore, the dehumidification function is also an important consideration in the design of the energy storage system. However, in the traditional dehumidification design of the energy storage system, although a water pan or other condensate water collection device is provided to accumulate the condensate water generated during the dehumidification process, these designs often ignore the convenience of condensate water treatment, and regular emptying of the condensate water collection device increases the maintenance cost of the energy storage system. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides an energy storage system and a photovoltaic energy storage system, which realizes the collection and reuse of condensate water, enhances the heat exchange capacity of the heat sink, reduces the energy consumption of the energy storage system, can realize the independent dehumidification function of the energy storage system, and can also extract part of the refrigerant for synchronous dehumidification in a specific mode, taking into account the heat management demand and dehumidification demand.

[0004] In a first aspect, the present application provides an energy storage system, comprising:

[0005] a refrigeration circuit, the refrigeration circuit comprising a compressor, a first path of a condenser, and an evaporator flow path, the evaporator flow path comprising a first branch and a second branch connected in parallel, the first branch comprising a first path of a first evaporator, and the second branch comprising a second evaporator, the second evaporator being used for dehumidification, and at least one of the first branch and the second branch being selectively communicated to the compressor;

[0006] an energy storage battery and a first flow path, a heat exchange part of the energy storage battery being communicated to the first flow path, and the first flow path comprising a first pump;

[0007] an electronic device and a second flow path, a heat exchange part of the electronic device being communicated to the second flow path, and the second flow path comprising a second pump;

[0008] a heat sink;

[0009] a valve group, a plurality of valve ports of the valve group being connected between the second path of the condenser, the second path of the first evaporator, the first flow path, the second flow path, and the heat sink, respectively;

[0010] A water collecting groove is arranged below the second evaporator in the direction of gravity to collect and accumulate condensed water;

[0011] A spraying device is in communication with the water collecting groove and adapted to spray toward the heat sink.

[0012] According to the energy storage system of the present application, the spraying device and the water collecting groove are arranged to collect and reuse the condensed water. The condensed water collected from the second evaporator is sprayed on the heat sink to rapidly reduce the temperature of the heat sink, enhance the heat exchange capacity of the heat sink, and improve the working performance of the refrigeration circuit. The energy storage system has low energy consumption and effectively utilizes the condensed water, which meets the environmental protection requirements of energy saving and emission reduction. Meanwhile, the energy storage system can independently dehumidify to maximize the dehumidification effect and maintain the efficient operation of the energy storage battery and electronic devices. In addition, part of the refrigerant can be extracted for synchronous dehumidification in a specific mode, which takes into account the heat management demand and dehumidification demand, thereby increasing the practicality and use width of the energy storage system. Moreover, the valve group is integrated with the heat management flow path to reduce the volume of the liquid cooling unit and improve the space utilization of the energy storage system. Meanwhile, the valve group realizes multiple heat management modes to improve the comprehensive use performance.

[0013] According to an embodiment of the present application, the spraying device comprises:

[0014] A spray head with a spray opening facing the heat sink;

[0015] A conveying pipe with an inlet connected to the water collecting groove and an outlet connected to the spray head;

[0016] A third pump for driving the condensed water in the conveying pipe to flow.

[0017] According to an embodiment of the present application, the valve group comprises:

[0018] A first valve with a first valve port connected to the inlet of the first flow path, a second valve port connected to the outlet of the second path of the condenser, a third valve port connected to the inlet of the second flow path, and a fourth valve port connected to the outlet of the second path of the first evaporator;

[0019] A second valve with a first valve port connected to the inlet of the heat sink, a second valve port connected to the inlet of the second path of the condenser, a third valve port connected to the outlet of the first flow path, a fourth valve port connected to the inlet of the second path of the first evaporator, and a fifth valve port connected to the outlet of the heat sink.

[0020] According to an embodiment of the present application, the energy storage system further comprises:

[0021] a heater and a first three-way valve, three ports of the first three-way valve are connected to the fourth port of the first valve, the inlet of the heater and the outlet of the second path of the first evaporator respectively, and the outlet of the heater is connected to the fifth port of the first valve.

[0022] According to one embodiment of the present application, the energy storage system further comprises:

[0023] a second three-way valve, three ports of the second three-way valve are connected to the first port of the second valve, the inlet of the radiator and the outlet of the second flow path respectively, and the heat exchange part of the electronic device is connected between the second three-way valve and the second pump.

[0024] According to one embodiment of the present application, the first branch further comprises a first expansion valve connected between the first path of the condenser and the first path of the first evaporator, and the second branch further comprises a second expansion valve connected between the first path of the condenser and the second evaporator.

[0025] According to one embodiment of the present application, the energy storage system has a first working mode, in which the compressor, the condenser, the radiator, the second evaporator and the second pump work, and the first pump and the first evaporator do not work; the second branch is in communication with the compressor, and the second flow path, the radiator and the second path of the condenser are sequentially connected end to end.

[0026] According to one embodiment of the present application, the energy storage system has a second working mode, in which the compressor, the condenser, the first evaporator, the radiator, the first pump and the second pump work; the first flow path and the second path of the first evaporator are connected end to end, and the second flow path, the radiator and the second path of the condenser are sequentially connected end to end.

[0027] According to one embodiment of the present application, the energy storage system has a third working mode, in which the radiator, the first pump and the second pump work, and the compressor, the condenser, the first evaporator and the second evaporator do not work; the first flow path, the second path of the condenser, the second flow path, the radiator and the second path of the first evaporator are sequentially connected end to end.

[0028] According to an embodiment of the present application, the energy storage system has a fourth working mode, in which the compressor, the condenser, the first evaporator, the first pump and the second pump work, and the radiator does not work; the first flow path and the second path of the condenser are connected in series, and the second flow path, the radiator and the second path of the first evaporator are connected in series.

[0029] According to an embodiment of the present application, the energy storage system has a fifth working mode, in which the first pump works, and the compressor, the condenser, the first evaporator, the second evaporator, the radiator and the second pump do not work; the first flow path, the second path of the first evaporator and the heater are connected in series.

[0030] According to an embodiment of the present application, the energy storage system has a sixth working mode, in which the compressor, the condenser, the first evaporator, the first pump, the second pump and the heater work, and the radiator does not work; the first flow path and the second path of the condenser are connected in series, and the second flow path, the second path of the first evaporator and the heater are connected in series.

[0031] According to an embodiment of the present application, the energy storage system has a seventh working mode, in which the first pump works, and the compressor, the condenser, the first evaporator, the second evaporator, the radiator and the second pump do not work; the first flow path and the second path of the condenser are connected in series.

[0032] According to an embodiment of the present application, the energy storage system has an eighth working mode, in which the second pump and the radiator work, and the compressor, the condenser, the first evaporator, the second evaporator and the first pump do not work; the second flow path, the radiator and the second path of the condenser are connected in series.

[0033] In a second aspect, the present application provides an energy storage system, comprising:

[0034] the energy storage system as in any of the above;

[0035] a photovoltaic power generation system for supplying power to the energy storage system.

[0036] According to the photovoltaic energy storage system of the present application, through the arrangement of the above-mentioned energy storage system, the condensate water is collected and reused, the condensate water on the second evaporator is collected and sprayed on the radiator, which can quickly reduce the temperature of the radiator, enhance the heat exchange capacity of the radiator, and improve the working performance of the refrigeration circuit, thereby reducing the energy consumption of the energy storage system and realizing the effective utilization of the condensate water, meeting the environmental protection requirements of energy saving and emission reduction, and realizing the independent dehumidification function of the energy storage system, maximizing the optimization of the dehumidification effect, maintaining the efficient operation of the energy storage battery and electronic devices, and also can extract part of the refrigerant for synchronous dehumidification in a specific mode, taking into account the heat management demand and dehumidification demand, thereby increasing the practicality and use width of the energy storage system, and adopting the valve group integrated heat management flow path to reduce the volume of the liquid cooling unit, improve the space utilization rate of the energy storage system, and realize multiple heat management modes, thereby improving the comprehensive use performance.

[0037] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0038] 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, wherein:

[0039] Figure 1 is a structural schematic diagram of an energy storage system provided by an embodiment of the present application;

[0040] Figure 2 is a structural schematic diagram of an energy storage system in a first working mode provided by an embodiment of the present application;

[0041] Figure 3 is a structural schematic diagram of an energy storage system in a second working mode provided by an embodiment of the present application;

[0042] Figure 4 is a structural schematic diagram of an energy storage system in a third working mode provided by an embodiment of the present application;

[0043] Figure 5 is a structural schematic diagram of an energy storage system in a fourth working mode provided by an embodiment of the present application;

[0044] Figure 6 is a structural schematic diagram of an energy storage system in a fifth working mode provided by an embodiment of the present application;

[0045] Figure 7 is a structural schematic diagram of an energy storage system in a sixth working mode provided by an embodiment of the present application;

[0046] Figure 8 is a structural schematic diagram of an energy storage system in a seventh working mode provided by an embodiment of the present application;

[0047] Figure 9 This is a schematic diagram of the energy storage system provided in the embodiment of this application in the eighth working mode.

[0048] Figure label:

[0049] Energy storage system 10, first valve 101, second valve 102, first three-way valve 103, second three-way valve 104;

[0050] Refrigeration circuit 11, compressor 111, condenser 112, first expansion valve 113, first evaporator 114, second evaporator 115, second expansion valve 116;

[0051] Energy storage battery 12;

[0052] First flow path 13, first pump 131;

[0053] Electronic components 14;

[0054] Second flow path 15, second pump 151;

[0055] Radiator 16, water tank 17, heater 18, water inlet 19;

[0056] Spraying device 21, nozzle 211, delivery pipe 212, third pump 213. Detailed Implementation

[0057] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein 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 with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0058] This application discloses an energy storage system 10.

[0059] The following is for reference. Figures 1-9 Describes an energy storage system 10 according to an embodiment of this application.

[0060] In some embodiments, such as Figure 1 As shown, the energy storage system 10 includes: a cooling circuit 11, an energy storage battery 12, a first flow path 13, electronic components 14, a second flow path 15, a radiator 16, a valve group, a water receiving tank 19, and a spray device 21.

[0061] like Figures 1-9As shown, the refrigeration circuit 11 includes a compressor 111, a first circuit of a condenser 112, and an evaporator circuit including a first branch and a second branch connected in parallel, the first branch including a first circuit of a first evaporator 114, and the second branch including a second evaporator 115 for dehumidification, at least one of the first branch and the second branch being selectively communicated to the compressor 111; a heat exchange portion of an energy storage battery 12 being communicated to a first circuit 13 including a first pump 131; a heat exchange portion of an electronic device 14 being communicated to a second circuit 15 including a second pump 151; a plurality of valve ports of a valve group being respectively connected between a second circuit of the condenser 112, a second circuit of the first evaporator 114, the first circuit 13, the second circuit 15, and a radiator 16; a water collecting groove 19 being located below the second evaporator 115 in a gravity direction, for collecting and accumulating condensed water; and a spraying device 21 being communicated to the water collecting groove 19 and adapted to be directed towards the radiator 16.

[0062] The first evaporator 114 is a refrigeration evaporator in the refrigeration circuit 11 for outputting cold energy to the outside, and the second evaporator 115 is a dehumidification evaporator in the refrigeration circuit 11 for absorbing water vapor, at least one of the first evaporator 114 and the second evaporator 115 being in a working state when the compressor 111 is turned on, and specifically, the first evaporator 114 and the second evaporator 115 can be operated synchronously or selectively.

[0063] The first pump 131 drives the cooling liquid in the first circuit 13 to circulate, and the cooling liquid in the first circuit 13 can exchange heat with the heat exchange portion of the energy storage battery 12 to achieve thermal management of the energy storage battery 12; and the second pump 151 drives the cooling liquid in the second circuit 15 to circulate, and the cooling liquid in the second circuit 15 can exchange heat with the heat exchange portion of the electronic device 14 to achieve thermal management of the electronic device 14.

[0064] The electronic device 14 can be a high-heat device in the energy storage system 10, and specifically, the electronic device 14 can include but is not limited to a power conversion assembly, a communication module, a detection module, or an interaction module, etc., and for example, in some embodiments, the electronic device 14 is a power conversion assembly.

[0065] The valve group is used to selectively communicate or disconnect the second circuit of the condenser 112, the second circuit of the first evaporator 114, the first circuit 13, and the second circuit 15, and by changing the communication relationship between the plurality of valve ports of the valve group, the energy storage system 10 can be configured with multiple thermal management modes, and the temperature control methods for the energy storage battery 12 and the electronic device 14 are different in each thermal management mode.

[0066] In actual implementation, as Figures 1-9As shown, when the energy storage system 10 detects that the ambient humidity exceeds a set threshold, the compressor 111 starts to work, inhales low-temperature and low-pressure gaseous refrigerant, and becomes high-temperature and high-pressure gaseous refrigerant after compression. The high-temperature and high-pressure gaseous refrigerant releases heat through the condenser 112 and condenses into high-pressure liquid refrigerant. Subsequently, the high-pressure liquid refrigerant flows to the second evaporator 115 through the refrigerant distribution process. At this time, the first evaporator 114 can be in a closed state or a low-load operation state. The high-pressure liquid refrigerant expands and evaporates in the second evaporator 115, absorbs heat from the surrounding air, and lowers the surface temperature of the second evaporator 115 to below the dew point. The water vapor in the air condenses into water, i.e. condensate, on the surface of the second evaporator 115, and the humidity in the air is significantly reduced, achieving dehumidification. The condensate on the surface of the second evaporator 115 flows into the water collecting groove 19 by gravity. The water collecting groove 19 is located below the second evaporator 115 in the direction of gravity, so that the condensate can be collected smoothly. When it is necessary to use the condensate for heat dissipation, the spraying device 21 is started. The condensate flows from the water collecting groove 19 into the spraying device 21. The spraying port of the spraying device 21 faces the radiator 16. The condensate is sprayed from the spraying port of the spraying device 21 and covers the surface of the radiator 16. The heat absorbed by the surface of the radiator 16 is quickly dissipated to the air through the evaporation of the condensate, achieving efficient heat dissipation.

[0067] The energy storage system 10 provided by the embodiment of the present application realizes the collection and reuse of condensate by the arrangement of the spraying device 21 and the water collecting groove 19. The condensate on the second evaporator 115 is collected and sprayed on the radiator 16, which can quickly reduce the temperature of the radiator 16, enhance the heat exchange capacity of the radiator 16, and improve the working performance of the refrigeration circuit 11. The energy storage system 10 not only reduces energy consumption, but also realizes effective utilization of condensate, meeting the environmental protection requirements of energy saving and emission reduction. At the same time, the independent dehumidification function of the energy storage system 10 can be realized, the dehumidification effect is optimized to the maximum extent, the efficient operation of the energy storage battery 12 and the electronic device 14 is maintained, and part of the refrigerant can be extracted for synchronous dehumidification in a specific mode, which takes into account the heat management demand and the dehumidification demand, thereby increasing the practicality and use width of the energy storage system 10. In addition, the valve group integrated heat management flow path is adopted to reduce the volume of the liquid cooling unit and improve the space utilization rate of the energy storage system 10. At the same time, multiple heat management modes are realized, and the comprehensive use performance is improved.

[0068] In some embodiments, as shown in Figures 1-9 The spraying device 21 comprises a spray head 211, a conveying pipe 212, and a third pump 213.

[0069] The spraying port of the spray head 211 faces the radiator 16. The inlet of the conveying pipe 212 is connected with the water collecting groove 19, and the outlet of the conveying pipe 212 is connected with the spray head 211. The third pump 213 is used to drive the flow of the condensate in the conveying pipe 212.

[0070] The delivery pipe 212 is a pipeline connected between the water collecting groove 19 and the spray head 211, and is used to deliver the condensed water from the water collecting groove 19 to the spray head 211. The inlet of the delivery pipe 212 can be communicated to the groove bottom of the water collecting groove 19, or the inlet of the delivery pipe 212 can be communicated to the groove wall of the water collecting groove 19, which is not limited here.

[0071] For example, in some embodiments, as shown in FIG. 2, the inlet of the delivery pipe 212 can be communicated to the groove bottom of the water collecting groove 19. Figures 1-9

[0072] The spray head 211 is used to spray the condensed water in the form of mist or water column. The heat absorbed by the surface of the heat sink 16 is rapidly dissipated to the air through the evaporation of the water mist, achieving high-efficiency heat dissipation. At the same time, the evaporation of the water mist also reduces the humidity of the surrounding environment, further improving the dehumidification effect.

[0073] The third pump 213 is used as a power source of the spraying device 21, and is used to drive the flow of the condensed water in the delivery pipe 212. Through the action of the third pump 213, the condensed water can overcome the pipeline resistance and be delivered from the water collecting groove 19 to the spray head 211 and sprayed out.

[0074] It should be noted that, in order to achieve a more precise control process, a liquid level sensor can be arranged in the water collecting groove 19. When the condensed water accumulates to a certain amount, the liquid level sensor sends a signal to the control system of the energy storage system 10. The control system determines whether the spraying device 21 needs to be started for heat dissipation operation according to the signal of the liquid level sensor. The condensed water that is not completely evaporated during the spraying process flows back to the water collecting groove 19, forming a recycling use. The water vapor after partial evaporation can be discharged to the outside through the exhaust system of the energy storage system 10 or be reabsorbed and utilized by other components in the energy storage system 10. When the condensed water in the water collecting groove 19 is reduced to a certain extent, the liquid level sensor sends a signal to the control system again. The control system adjusts the working state of the spraying device 21 or starts other water supplementing measures according to the actual demand.

[0075] The energy storage system 10 provided by the embodiments of the present application, through the arrangement of the spray head 211, the delivery pipe 212 and the third pump 213, the spray opening of the spray head 211 directly faces the heat sink 16, so that the condensed water can directly act on the surface of the heat sink 16. The condensed water forms fine water mist or water column during the spraying process. These water mists can quickly cover the surface of the heat sink 16, increase the heat dissipation area, and improve the heat dissipation efficiency, thereby significantly improving the heat dissipation capacity of the system, reducing the working temperature of the energy storage battery 12 and the electronic device 14, and further prolonging the service life of the energy storage battery 12 and the electronic device 14. At the same time, the overall structure of the spraying device 21 is simple, the functions of the components are clear, and the miniaturization and lightweight design of the spraying device 21 are achieved.

[0076] ​In some embodiments, such as Figures 1-9 As shown, the valve assembly includes: a first valve 101 and a second valve 102.

[0077] The first valve port A1 of the first valve 101 is connected to the inlet of the first flow path 13, the second valve port A2 of the first valve 101 is connected to the outlet of the second path of the condenser 112, the third valve port A3 of the first valve 101 is connected to the inlet of the second flow path 15, and the fourth valve port A4 of the first valve 101 is connected to the outlet of the second path of the first evaporator 114; the first valve port B1 of the second valve 102 is connected to the inlet of the radiator 16, the second valve port B2 of the second valve 102 is connected to the inlet of the second path of the condenser 112, the third valve port B3 of the second valve 102 is connected to the outlet of the first flow path 13, the fourth valve port B4 of the second valve 102 is connected to the inlet of the second path of the first evaporator 114, and the fifth valve port B5 of the second valve 102 is connected to the outlet of the radiator 16.

[0078] In this embodiment, the four valve ports of the first valve 101 and the five valve ports of the second valve 102 can be connected to the inlet and outlet of the radiator 16, the inlet and outlet of the second path of the condenser 112, the inlet and outlet of the second path of the evaporator, the inlet and outlet of the first flow path 13, and the inlet of the second flow path 15, respectively. By changing the connection relationship between the four valve ports of the first valve 101 and the five valve ports of the second valve 102, the relationship between the first radiator 16, the second path of the condenser 112, the second path of the evaporator, the first flow path 13, and the second flow path 15 can be changed to achieve multiple thermal management modes.

[0079] The energy storage system 10 provided in this application embodiment, through the setting of the first valve 101 and the second valve 102, utilizes the separate design of the two valves so that after assembly, the various pipelines do not need to be piled up in the same position. This makes it easier for relevant operators to identify the pipelines during maintenance and repair, improves the maintainability of the entire energy storage system 10, reduces the complexity of pipeline laying, shortens the time required for valve assembly, and is conducive to mass production. At the same time, by controlling the on / off state of each valve port of the first valve 101 and the second valve 102, multiple thermal management modes are realized, thereby increasing the versatility of the energy storage system 10.

[0080] In some embodiments, such as Figures 1-9 As shown, the energy storage system 10 also includes a heater 18 and a first three-way valve 103.

[0081] The three valve ports of the first three-way valve 103 are respectively connected to the fourth valve port A4 of the first valve 101, the inlet of the heater 18 and the outlet of the second path of the first evaporator 114, and the outlet of the heater 18 is connected to the fifth valve port A5 of the first valve 101.

[0082] For example, such as Figures 2-9As shown, the plurality of thermal management modes can include, but are not limited to: one, in the independent dehumidification mode, the energy storage battery 12 does not perform thermal management, the heat sink 16 can dissipate heat from the electronic device 14 and the condenser 112, the second branch is connected to the compressor 111, the water vapor in the air condenses into water and adheres to the surface of the second evaporator 115, and the condensed water is collected to complete the dehumidification process; two, in the active refrigeration mode, the first evaporator 114 can dissipate heat from the energy storage battery 12, and at the same time, the heat sink 16 can dissipate heat from the electronic device 14 and the condenser 112; three, in the natural cooling mode, the heat sink 16 can dissipate heat from the energy storage battery 12 and the electronic device 14; four, in the heat pump heating mode, the condenser 112 can heat the energy storage battery 12, and the waste heat of the electronic device 14 can heat the first evaporator 114; five, in the electric heating mode, the heater 18 can heat the energy storage battery 12; six, in the hybrid heating mode, the condenser 112 can heat the energy storage battery 12, and the waste heat of the electronic device 14 and the heater 18 can heat the first evaporator 114; seven, in the active uniform temperature mode, the cooling liquid in the first flow path 13 is driven to circulate to promote internal uniform temperature of the energy storage battery 12; eight, in the electronic device 14 liquid cooling mode, the heat sink 16 can dissipate heat from the electronic device 14.

[0083] It should be noted that, in the active refrigeration mode, the heat pump heating mode, and the hybrid heating mode, since the compressor 111 is in a working state, the first branch and the second branch can be connected to the compressor 111, and therefore, for the energy storage system 10, in addition to the dehumidification function in the independent dehumidification mode, the thermal management demand and the dehumidification demand can also be considered in the active refrigeration mode, the heat pump heating mode, and the hybrid heating mode.

[0084] In this embodiment, as shown, Figures 1-9 the first valve 101 can have five valve ports, the first valve port A1 of the first valve 101 can be connected to the inlet of the first flow path 13, the second valve port A2 of the first valve 101 can be connected to the outlet of the second path of the condenser 112, the third valve port A3 of the first valve 101 can be connected to the inlet of the second flow path 15, the fourth valve port A4 of the first valve 101 can be connected to the outlet of the second path of the evaporator 114, and the fifth valve port A5 of the first valve 101 can be connected to the outlet of the heater 18. When the energy storage system 10 switches between the independent dehumidification mode, the active refrigeration mode, the natural cooling mode, the heat pump heating mode, the active uniform temperature mode, and the electronic device 14 liquid cooling mode, the heater is stopped at this time, the connection between the fifth valve port A5 of the first valve 101 and the other valve ports can be directly disconnected, so as to shield the pipeline where the heater 18 is located, so that the cooling water does not need to pass through the heater 18 in the circulation process.

[0085] The energy storage system provided in this application embodiment, through the setting of the heater 18 and the first three-way valve 103, provides a choice of heating schemes for heater 18 heating and heat pump heating combined with heater 18 heating, based on the waste heat heating of electronic device 14 and heat pump heating. Different heating schemes can be selected according to actual heat demand, increasing the maximum total heat supply of the entire heating system, enhancing the adaptability of energy storage system 10 in extremely cold weather, refining the heating mode, and adopting a double five-way valve design. The first valve 101 can bypass heater 18, so that in independent dehumidification mode, active cooling mode, natural cooling mode, heat pump heating mode, active temperature equalization mode, and liquid cooling mode of electronic device 14, the cooling water does not need to pass through heater 19 during the circulation process, thereby reducing the coolant flow resistance of the circuit where energy storage battery 12 is located in the above modes, and thus improving system energy efficiency.

[0086] In some embodiments, such as Figures 1-9 As shown, the energy storage system 10 also includes a second three-way valve 104.

[0087] The three valve ports of the second three-way valve 104 are respectively connected to the first valve port B1 of the second valve 102, the inlet of the radiator 16, and the outlet of the second flow path 15, and the heat exchange part of the electronic device 14 is connected between the second three-way valve 104 and the second pump 151.

[0088] It is understandable that, such as Figure 7 As shown, in the mixed heating mode, the electronic device 14 and the heater 18 jointly provide supplementary heating on the side of the first evaporator 114. From the perspective of the coolant flow direction, the second coolant leaving the first evaporator 114 will first flow through the heater 18 and then through the electronic device 14 for two heating cycles. Since the ambient temperature is extremely low in the mixed heating mode, the temperature of the coolant will be higher than the ambient temperature. If the coolant then passes through the radiator, the coolant will exchange heat with the external environment during the process of passing through the radiator, resulting in heat loss and affecting the heating capacity of the entire refrigeration circuit.

[0089] In the case where the energy storage system 10 also includes a second three-way valve 104, in the mixed heating mode, the valve port of the first valve port B1 connected to the second valve 102 and the valve port connected to the outlet of the second flow path 15 can be connected among the three valve ports of the second three-way valve 104, so that the coolant does not flow through the radiator 16, thereby preventing the coolant from generating heat loss in the process of passing through the radiator 16, and thus maximizing the external heating capacity of the refrigeration circuit 11 in the mixed heating mode.

[0090] In some embodiments, such as Figures 1-9As shown, the first branch further comprises a first expansion valve 113 connected between the first path of the condenser 112 and the first path of the first evaporator 114, and the second branch further comprises a second expansion valve 116 connected between the first path of the condenser 112 and the second evaporator 115.

[0091] In this embodiment, as shown in Figures 1-9 As shown, the first branch comprises a first expansion valve 113 and a first evaporator 114 connected in series, the first expansion valve 113 can independently control the on-off of the first branch, and the first expansion valve 113 can independently control the pressure and flow of the refrigerant flowing from the condenser 112 to the first evaporator 114; the second branch comprises a second expansion valve 116 and a second evaporator 115 connected in series, the second expansion valve 116 can independently control the on-off of the second branch, and the second expansion valve 116 can independently control the pressure and flow of the refrigerant flowing from the condenser 112 to the second evaporator 115.

[0092] In other embodiments, the first branch and the second branch share one expansion valve, in which case the independent dehumidification mode cannot be realized.

[0093] In yet other embodiments, the first branch further comprises an expansion valve, and the second branch further comprises a switch valve, in which case the refrigerant pressure and flow of the second branch cannot be controlled.

[0094] The energy storage system 10 provided by the embodiments of the present application can independently control the refrigerant flow of the first branch and the second branch through the first expansion valve 113 and the second expansion valve 116, meet different refrigeration requirements or dehumidification requirements, more flexibly adjust the distribution of the refrigerant, meet the requirements in different thermal management modes, support efficient operation in multiple modes, optimize the thermal management efficiency of the entire energy storage system 10, and can more conveniently locate problems and handle them during maintenance. If the expansion valve of a certain branch fails, it can be replaced individually without affecting the operation of the entire energy storage system 10.

[0095] In some embodiments, as shown in Figure 2 The energy storage system 10 has a first working mode, in which the compressor 111, the condenser 112, the heat sink 16, the second evaporator 115 and the second pump 151 work, and the first pump 131 and the first evaporator 114 do not work; the second branch is in communication with the compressor 111, and the second flow path 15, the heat sink 16 and the second path of the condenser 112 are sequentially connected end to end.

[0096] In this embodiment, as shown in Figure 2As shown, the first working mode is the above-mentioned independent dehumidification mode, when the energy storage system 10 switches to the first working mode, the first expansion valve 113 is closed, the second expansion valve 116 is opened, and the on-off state of each valve port of the first valve 101 and the second valve 102 is: the second valve port A2 of the first valve 101 is in communication with the third valve port A3 of the first valve 101; the second valve port B2 of the second valve 102 is in communication with the fifth valve port B5 of the second valve 102.

[0097] The energy storage system 10 provided by the embodiment of the present application, through the design of the above-mentioned first working mode, the system focuses on dehumidification function in this mode, the second evaporator 115 is used as a dedicated dehumidification element, absorbs the humidity in the surrounding environment and condenses it into liquid water to discharge, thereby effectively reducing the environmental humidity, since the first evaporator 114 does not participate in the work, the system can concentrate resources on the dehumidification task, improve the dehumidification efficiency, so that the energy storage system 10 can adapt to more extensive environmental conditions, especially in high humidity environment. It is particularly important for some application scenarios with high humidity requirements, and by closing the first pump 131 and the first evaporator 114, unnecessary energy consumption is reduced, in the use scenario where only dehumidification is required without the need for heat management of the energy storage battery 12, this design reduces the waste of energy and improves the overall energy efficiency of the energy storage system 10.

[0098] In some embodiments, as Figure 3 As shown, the energy storage system 10 has a second working mode, in the second working mode, the compressor 111, the condenser 112, the first evaporator 114, the heat sink 16, the first pump 131 and the second pump 151 work; the first flow path 13 and the second path of the first evaporator 114 are connected in series, and the second flow path 15, the heat sink 16 and the second path of the condenser 112 are connected in series.

[0099] In this embodiment, as Figure 3 As shown, the second working mode is the above-mentioned active refrigeration mode, when the energy storage system 10 switches to the second working mode, the first expansion valve 113 is opened, the second expansion valve 116 is controlled according to the actual demand, and the on-off state of each valve port of the first valve 101 and the second valve 102 is: the first valve port A1 of the first valve 101 is in communication with the fourth valve port A4 of the first valve 101, the second valve port A2 of the first valve 101 is in communication with the third valve port A3 of the first valve 101; the second valve port B2 of the second valve 102 is in communication with the fifth valve port B5 of the second valve 102, and the third valve port B3 of the second valve 102 is in communication with the fourth valve port B4 of the second valve 102.

[0100] The energy storage system 10 provided by the embodiments of the present application realizes fluorine cooling heat dissipation of the energy storage battery 12 by the design of the second working mode when the temperature of the energy storage battery 12 is too high, simultaneously realizes heat dissipation of the electronic device 14 and the condenser 112 by the radiator 16, takes into account the heat dissipation requirements of the energy storage battery 12, the electronic device 14 and the condenser 112, relieves a series of domino effects of thermal runaway of the energy storage battery 12 due to over-temperature, and thus prolongs the service life of the energy storage battery 12.

[0101] In some embodiments, as shown in Figure 4 The energy storage system 10 has a third working mode, in which the radiator 16, the first pump 131 and the second pump 151 work, and the compressor 111, the condenser 112, the first evaporator 114 and the second evaporator 115 do not work; the first flow path 13, the second flow path of the condenser 112, the second flow path 15, the radiator 16 and the second flow path of the first evaporator 114 are sequentially connected in series.

[0102] In this implementation, as shown in Figure 4 The third working mode is the natural cooling mode described above. When the energy storage system 10 switches to the third working mode, the on-off state of each valve port of the first valve 101 and the second valve 102 is as follows: the first valve port A1 of the first valve 101 is in communication with the fourth valve port A4 of the first valve 101, and the second valve port A2 of the first valve 101 is in communication with the third valve port A3 of the first valve 101; the second valve port B2 of the second valve 102 is in communication with the third valve port B3 of the second valve 102, and the fourth valve port B4 of the second valve 102 is in communication with the fifth valve port B5 of the second valve 102.

[0103] The energy storage system 10 provided by the embodiments of the present application realizes fluorine cooling heat dissipation of the energy storage battery 12 by the design of the second working mode when the temperature of the energy storage battery 12 is too high, simultaneously realizes heat dissipation of the electronic device 14 and the condenser 112 by the radiator 16, takes into account the heat dissipation requirements of the energy storage battery 12, the electronic device 14 and the condenser 112, relieves a series of domino effects of thermal runaway of the energy storage battery 12 due to over-temperature, and thus prolongs the service life of the energy storage battery 12.

[0104] In some embodiments, as shown in Figure 5 The energy storage system 10 has a fourth working mode, in which the compressor 111, the condenser 112, the first evaporator 114, the first pump 131 and the second pump 151 work, and the radiator 16 does not work; the first flow path 13 and the second flow path of the condenser 112 are connected in series, and the second flow path 15, the radiator 16 and the second flow path of the first evaporator 114 are sequentially connected in series.

[0105] In this implementation, as shown in Figure 5As shown, the fourth working mode is the above-mentioned heat pump heating mode. When the energy storage system 10 switches to the fourth working mode, the first expansion valve 113 is opened, and the second expansion valve 116 is controlled to open or close according to actual needs. The on-off states of the valve ports of the first valve 101 and the second valve 102 are as follows: the first valve port A1 of the first valve 101 is in communication with the second valve port A2 of the first valve 101, and the third valve port A3 of the first valve 101 is in communication with the fourth valve port A4 of the first valve 101; the second valve port B2 of the second valve 102 is in communication with the third valve port B3 of the second valve 102, and the fourth valve port B4 of the second valve 102 is in communication with the fifth valve port B5 of the second valve 102.

[0106] The energy storage system 10 provided by the embodiments of the present application realizes heating of the energy storage battery 12 by the condenser 112 of the refrigeration circuit 11 in the case of excessively low temperature of the energy storage battery 12, so that the energy storage battery 12 can normally work in a low-temperature environment, and the performance of the energy storage system 10 is optimized. Meanwhile, the waste heat of the electronic device 14 is used to supplement the low-pressure end of the refrigerant circulation, so that the effect of combined heating of the electronic device 14 and the compressor 111 is achieved.

[0107] In some embodiments, as shown in FIG. 1, Figure 6 As shown, the energy storage system 10 has a fifth working mode. In the fifth working mode, the first pump 131 works, and the compressor 111, the condenser 112, the first evaporator 114, the second evaporator 115, the heat sink 16 and the second pump 151 do not work; the first flow path 13, the second flow path of the first evaporator 114 and the heater 18 are sequentially connected end to end.

[0108] In this implementation, as shown in FIG. 1, Figure 6 As shown, the fifth working mode is the above-mentioned electric heating mode. When the energy storage system 10 switches to the fifth working mode, the on-off states of the valve ports of the first valve 101 and the second valve 102 are as follows: the first valve port A1 of the first valve 101 is in communication with the fifth valve port A5 of the first valve 101; and the third valve port B3 of the second valve 102 is in communication with the fourth valve port B4 of the second valve 102.

[0109] The energy storage system 10 provided by the embodiments of the present application realizes heating of the energy storage battery 12 by the heater 18 in the case of low temperature of the energy storage battery 12, so that the basic heat demand of the energy storage battery 12 in a low-temperature environment is met, and unnecessary energy consumption caused by switching of the heat pump heating mode of the energy storage battery 12 due to slight temperature drop is prevented, so that the operating energy efficiency of the entire energy storage system 10 is improved without affecting the performance of the energy storage battery 12.

[0110] In some embodiments, as shown in FIG. 1, Figure 7As shown, the energy storage system 10 has a sixth working mode, in which the compressor 111, the condenser 112, the first evaporator 114, the first pump 131, the second pump 151 and the heater 18 work, and the radiator 16 does not work; the first flow path 13 and the second flow path of the condenser 112 are connected in sequence.

[0111] In this embodiment, as shown in the figure, Figure 7 The sixth working mode is the above-mentioned mixed heating mode. When the energy storage system 10 switches to the sixth working mode, the first expansion valve 113 is opened, the second expansion valve 116 is controlled to open or close according to actual needs, and the on-off state of each valve port of the first valve 101 and the second valve 102 is as follows: the first valve port A1 of the first valve 101 is in communication with the second valve port A2 of the first valve 101, and the third valve port A3 of the first valve 101 is in communication with the fifth valve port A5 of the first valve 101; the first valve port B1 of the second valve 102 is in communication with the fourth valve port B4 of the second valve 102, and the second valve port B2 of the second valve 102 is in communication with the third valve port B3 of the second valve 102.

[0112] The energy storage system 10 provided by the embodiment of the present application realizes the use of the heater 18, the waste heat of the electronic device 14 and the heating of the compressor 111 to jointly provide heat in the case that the temperature of the energy storage battery 12 is too low, the first flow path 13 is in communication with the second flow path of the condenser 112 to enable the condenser 112 to directly heat the energy storage battery 12, and the second flow path 15 is in communication with the heater 18 and the evaporator to enable the heater 18 and the waste heat of the electronic device 14 to heat the low-pressure end, thereby realizing the output of excess heat power, and further improving the heating power and accelerating the temperature rise rate of the energy storage battery 12 in an extremely cold environment.

[0113] In some embodiments, as shown in the figure, Figure 8 The energy storage system 10 has a seventh working mode, in which the first pump 131 works, and the compressor 111, the condenser 112, the first evaporator 114, the second evaporator 115, the radiator 16 and the second pump 151 do not work; the first flow path 13 and the second flow path of the condenser 112 are connected in sequence.

[0114] In this embodiment, as shown in the figure, Figure 8 The seventh working mode is the above-mentioned active uniform heating mode. When the energy storage system 10 switches to the seventh working mode, the on-off state of each valve port of the first valve 101 and the second valve 102 is as follows: the first valve port A1 of the first valve 101 is in communication with the second valve port A2 of the first valve 101; and the second valve port B2 of the second valve 102 is in communication with the third valve port B3 of the second valve 102.

[0115] The energy storage system 10 provided by the embodiments of the present application actively equalizes the temperature of the entire energy storage system 10 by using the cooling liquid circulation in the seventh working mode. Considering that the heat dissipation pressure of the system is small at this time, no additional heat dissipation configuration is needed, the equalization of the temperature of the plurality of battery monomers in the energy storage battery 12 is improved, and the uniformity of the temperature of the entire energy storage system 10 in the case of moderate ambient temperature is improved.

[0116] In some embodiments, as shown in Figure 9 The energy storage system 10 has an eighth working mode. In the eighth working mode, the second pump 151 and the radiator 16 work, and the compressor 111, the condenser 112, the first evaporator 114, the second evaporator 115 and the first pump 131 do not work; the second flow path 15, the radiator 16 and the second path of the condenser 112 are sequentially connected end to end.

[0117] In this implementation, as shown in Figure 9 The eighth working mode is the liquid cooling mode of the electronic device 14 described above. When the energy storage system 10 switches to the eighth working mode, the on-off state of each valve port of the first valve 101 and the second valve 102 is as follows: the second valve port A2 of the first valve 101 is in communication with the third valve port A3 of the first valve 101; the second valve port B2 of the second valve 102 is in communication with the fifth valve port B5 of the second valve 102.

[0118] The energy storage system 10 provided by the embodiments of the present application only starts the second pump 151 and the radiator 16, and cools the electronic device 14 by using natural heat dissipation in the eighth working mode. Without the need for high-intensity cooling or refrigeration, the high-energy-consumption devices such as the compressor 111, the condenser 112 and the evaporator are closed, which can significantly reduce the overall energy consumption of the energy storage system 10, improve the energy efficiency ratio and energy utilization efficiency of the energy storage system 10, and at the same time, the energy storage system 10 can flexibly adjust the working mode according to the actual demand, without the need to run a complete refrigeration cycle in all cases. The control logic and operation process of the energy storage system 10 are simplified, and the reliability and response speed of the energy storage system 10 are improved.

[0119] The present application also discloses a photovoltaic energy storage system.

[0120] In some embodiments, the photovoltaic energy storage system comprises a photovoltaic power generation system and an energy storage system 10 as any one of the above.

[0121] The photovoltaic power generation system is used to supply power to the energy storage system 10.

[0122] The photovoltaic power generation system can include a photovoltaic assembly and an inverter unit. The energy storage battery 12 in the energy storage system 10 can be connected to the direct-current power output by the photovoltaic assembly, and other power-consuming modules in the energy storage system 10 can be connected to the alternating-current power output by the inverter unit.

[0123] The photovoltaic energy storage system provided by the embodiment of the present application realizes the collection and reuse of condensed water through the setting of the energy storage system 10. After the condensed water on the second evaporator 115 is collected and sprayed on the radiator 16, the temperature of the radiator 16 can be rapidly reduced, the heat exchange capacity of the radiator 16 is enhanced, and the working performance of the refrigeration circuit 11 is improved. The energy consumption of the energy storage system 10 is reduced, the effective utilization of the condensed water is realized, the environmental protection requirement of energy saving and emission reduction is met, the independent dehumidification function of the energy storage system 10 can be realized, the dehumidification effect is optimized to the maximum extent, the efficient operation of the energy storage battery 12 and the electronic device 14 is maintained, part of the refrigerant can be extracted for synchronous dehumidification in a specific mode, the heat management demand and the dehumidification demand are considered, the practicability and the use width of the energy storage system 10 are increased, the valve group integrated heat management flow path is adopted to reduce the volume of the liquid cooling unit and improve the space utilization rate of the energy storage system 10, multiple heat management modes are realized, and the comprehensive use performance is improved.

[0124] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of a kind and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the front and rear associated objects are in an "or" relationship.

[0125] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying 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.

[0126] In the description of the present application, "first feature" and "second feature" can include one or more features.

[0127] In the description of the present application, "a plurality of" means two or more.

[0128] In the description of the present application, "above" or "below" of the first feature to the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them.

[0129] In the description of the application, above, over and on of a first feature relative to a second feature include the first feature directly above and obliquely above the second feature, or simply mean that the first feature is horizontally higher than the second feature.

[0130] In the description of the application, descriptions with reference to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" 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 application. In the description of the application, the exemplary descriptions 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 appropriate manner in one or more embodiments or examples.

[0131] Although the embodiments of the application have been shown and described, it is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. An energy storage system, characterized in that, include: A refrigeration circuit, comprising a compressor, a first path of a condenser, and an evaporator path, wherein the evaporator path comprises a first branch and a second branch connected in parallel, the first branch comprising a first path of a first evaporator, the second branch comprising a second evaporator, the second evaporator being used for dehumidification, and at least one of the first branch and the second branch being selectively connected to the compressor. An energy storage battery and a first flow path, wherein the heat exchange section of the energy storage battery is connected to the first flow path, and the first flow path includes a first pump; An electronic device and a second flow path, wherein the heat exchange section of the electronic device is connected to the second flow path, and the second flow path includes a second pump; heat sink; A valve assembly, wherein multiple valve ports of the valve assembly are respectively connected to the second path of the condenser, the second path of the first evaporator, the first flow path, the second flow path, and the radiator. The valve assembly includes a first valve and a second valve. The first valve's first valve port is connected to the inlet of the first flow path, the second valve port of the first valve is connected to the outlet of the second path of the condenser, the third valve port of the first valve is connected to the inlet of the second flow path, and the fourth valve port of the first valve is connected to the outlet of the second path of the first evaporator. The second valve's first valve port is connected to the inlet of the radiator, the second valve port of the second valve is connected to the inlet of the second path of the condenser, the third valve port of the second valve is connected to the outlet of the first flow path, the fourth valve port of the second valve is connected to the inlet of the second path of the first evaporator, and the fifth valve port of the second valve is connected to the outlet of the radiator. A water receiving tank, located below the second evaporator along the direction of gravity, is used to collect and store condensate. A spraying device, which is connected to the water receiving tank and is adapted to face the radiator; The heater and the first three-way valve, the three valve ports of the first three-way valve are respectively connected to the fourth valve port of the first valve, the inlet of the heater and the outlet of the second path of the first evaporator, and the outlet of the heater is connected to the fifth valve port of the first valve. The second three-way valve has three valve ports connected to the first valve port of the second valve, the inlet of the radiator, and the outlet of the second flow path, respectively, and the heat exchange section of the electronic device is connected between the second three-way valve and the second pump.

2. The energy storage system according to claim 1, characterized in that, The spraying device includes: The nozzle has its spray nozzle facing the radiator; A delivery pipe, the inlet of which is connected to the water receiving tank, and the outlet of which is connected to the nozzle; The third pump is used to drive the flow of condensate in the delivery pipe.

3. The energy storage system according to claim 1, characterized in that, The first branch also includes a first expansion valve, which is connected between the first path of the condenser and the first path of the first evaporator. The second branch also includes a second expansion valve, which is connected between the first path of the condenser and the second evaporator.

4. The energy storage system according to any one of claims 1-3, characterized in that, The energy storage system has a first operating mode, in which the compressor, the condenser, the radiator, the second evaporator and the second pump are operating, while the first pump and the first evaporator are not operating. The second branch is connected to the compressor, and the second flow path, the second path of the radiator and the second path of the condenser are connected end to end in sequence.

5. The energy storage system according to any one of claims 1-3, characterized in that, The energy storage system has a second operating mode, in which the compressor, the condenser, the first evaporator, the radiator, the first pump, and the second pump operate; The first flow path and the second path of the first evaporator are connected end to end, and the second flow path, the radiator and the second path of the condenser are connected end to end in sequence.

6. The energy storage system according to any one of claims 1-3, characterized in that, The energy storage system has a third operating mode, in which the radiator, the first pump and the second pump are working, and the compressor, the condenser, the first evaporator and the second evaporator are not working; the first flow path, the second flow path of the condenser, the second flow path, the second flow path of the radiator and the second flow path of the first evaporator are connected end to end in sequence.

7. The energy storage system according to any one of claims 1-3, characterized in that, The energy storage system has a fourth operating mode. In the fourth operating mode, the compressor, the condenser, the first evaporator, the first pump, and the second pump are operating, while the radiator is not operating. The first flow path and the second path of the condenser are connected end to end, and the second flow path, the radiator, and the second path of the first evaporator are connected end to end in sequence.

8. The energy storage system according to any one of claims 1-3, characterized in that, The energy storage system has a fifth operating mode. In the fifth operating mode, the first pump is working, while the compressor, the condenser, the first evaporator, the second evaporator, the radiator, and the second pump are not working. The first flow path, the second path of the first evaporator, and the heater are connected sequentially end to end.

9. The energy storage system according to any one of claims 1-3, characterized in that, The energy storage system has a sixth operating mode. In the sixth operating mode, the compressor, the condenser, the first evaporator, the first pump, the second pump, and the heater are operating, while the radiator is not operating. The first flow path and the second path of the condenser are connected end to end, and the second flow path, the second path of the first evaporator, and the heater are connected end to end in sequence.

10. The energy storage system according to any one of claims 1-3, characterized in that, The energy storage system has a seventh operating mode. In the seventh operating mode, the first pump is working, while the compressor, the condenser, the first evaporator, the second evaporator, the radiator, and the second pump are not working. The first flow path and the second flow path of the condenser are connected end to end.

11. The energy storage system according to any one of claims 1-3, characterized in that, The energy storage system has an eighth operating mode. In the eighth operating mode, the second pump and the radiator are working, while the compressor, the condenser, the first evaporator, the second evaporator, and the first pump are not working. The second flow path, the second path of the radiator, and the second path of the condenser are connected end to end in sequence.

12. A photovoltaic energy storage system, characterized in that, include: The energy storage system as described in any one of claims 1-11; A photovoltaic power generation system, wherein the photovoltaic power generation system is used to supply power to the energy storage system.

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