Energy storage system and photovoltaic energy storage system

Abstract

The invention 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 refrigerating circuit, an energy storage battery, a first flow path, an electronic device, a second flow path, a radiator, a valve bank, a water receiving tank and a spraying device. A plurality of valve ports of the valve bank are connected with a second path of the condenser, a second path of the first evaporator, the first flow path, the second flow path and the radiator. The water receiving tank is located below the second evaporator in the gravity direction and used for receiving and storing condensate water. The spraying device communicates with the water receiving tank and is suitable for facing the radiator. By means of the structure, collection and recycling of condensate water are achieved, the heat exchange capacity of the radiator is enhanced, the independent dehumidification function is achieved, part of refrigerants can be extracted for synchronous dehumidification, the heat management requirement and the dehumidification requirement are both considered, the practicability and the use width of the energy storage system are increased, the size of a liquid cooling unit is reduced, and the space utilization rate of the energy storage system is increased; a plurality of heat management modes are realized, and the comprehensive use performance is improved.

Description

Technical Field

[0001] The present application belongs to the field of energy storage technology, and in particular relates to an energy storage system and a photovoltaic energy storage system. Background Art

[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 an environment with high humidity, moisture easily accumulates in the internal space of the energy storage system, affecting the insulation performance and electrical safety of the equipment. Therefore, dehumidification function is also an important consideration in the design of energy storage systems. However, in the traditional dehumidification design of energy storage systems, although water pans or other condensate collection devices are set up to accumulate condensate generated during the dehumidification process, these designs often ignore the convenience of condensate treatment, and regular emptying of the condensate collection device increases the maintenance cost of the energy storage system. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an energy storage system and a photovoltaic energy storage system, which realizes the collection and reuse of condensed water, enhances the heat exchange capacity of the radiator, 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 both thermal management requirements and dehumidification requirements.

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

[0005] A refrigeration circuit, the refrigeration circuit includes a compressor, a first path of a condenser and an evaporator flow path, the evaporator flow path includes a first branch and a second branch connected in parallel, the first branch includes a first path of a first evaporator, the second branch includes a second evaporator, the second evaporator is used for dehumidification, and at least one of the first branch and the second branch can be selectively connected to the compressor;

[0006] An energy storage battery and a first flow path, wherein a heat exchange portion of the energy storage battery is connected to the first flow path, and the first flow path includes a first pump;

[0007] An electronic device and a second flow path, a heat exchange portion of the electronic device is connected to the second flow path, and the second flow path includes a second pump;

[0008] heat sink;

[0009] A valve group, wherein a plurality of valve ports of the valve group 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;

[0010] A water receiving tank, the water receiving tank is located below the second evaporator along the gravity direction and is used to receive and accumulate condensed water;

[0011] A spray device is connected to the water receiving tank and is suitable for facing the radiator.

[0012] According to the energy storage system of the present application, the collection and reuse of condensed water is realized through the arrangement of the above-mentioned spraying device and the water receiving trough. After the condensed water on the second evaporator is collected, it is 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. It not only reduces the energy consumption of the energy storage system, but also realizes the effective utilization of condensed water, which meets the environmental protection requirements of energy conservation and emission reduction. At the same time, it can realize the independent dehumidification function of the energy storage system, maximize the dehumidification effect, maintain the efficient operation of the energy storage battery and electronic devices, and can also extract part of the refrigerant in a specific mode for synchronous dehumidification, taking into account the thermal management needs and dehumidification needs, thereby increasing the practicality and usage width of the energy storage system, and adopts a valve group to integrate the thermal management flow path, reduce the volume of the liquid cooling unit, and improve the space utilization rate of the energy storage system. At the same time, multiple thermal management modes are realized to improve the comprehensive usage performance.

[0013] According to one embodiment of the present application, the spray device comprises:

[0014] a nozzle, wherein a spray port of the nozzle is directed toward the radiator;

[0015] A delivery pipe, wherein the inlet of the delivery pipe is connected to the water receiving tank, and the outlet of the delivery pipe is connected to the nozzle;

[0016] The third pump is used to drive the condensed water in the delivery pipe to flow.

[0017] According to one embodiment of the present application, the valve group includes:

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

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

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

[0021] A heater and a first three-way valve, wherein 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 is connected to 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.

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

[0023] A second three-way valve, wherein three valve ports of the second three-way valve are respectively connected to the first valve port of the second valve, the inlet of the radiator and the outlet of the second flow path, 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 also includes a first expansion valve, which is connected between the first path of the condenser and the first path of the first evaporator, and the second branch also includes a second expansion valve, which is 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 operating mode. In the first operating mode, the compressor, the condenser, the radiator, the second evaporator and the second pump are working, and the first pump and the first evaporator are not working; the second branch is connected to the compressor, and the second flow path, the radiator and the second path of the condenser are connected end to end in sequence.

[0026] According to one embodiment of the present application, the energy storage system has a second operating mode. In the second operating mode, the compressor, the condenser, the first evaporator, the radiator, the first pump and the second pump are working; 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.

[0027] According to one embodiment of the present application, the energy storage system has a third working mode. In the third working mode, 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 path of the condenser, the second flow path, the radiator and the second path of the first evaporator are connected end to end in sequence.

[0028] According to one embodiment of the present application, 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 working, and the radiator is not working; 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.

[0029] According to one embodiment of the present application, the energy storage system has a fifth working mode. In the fifth working mode, the first pump is working, and 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 end to end in sequence.

[0030] According to one embodiment of the present application, 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 working, and the radiator is not working; 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.

[0031] According to one embodiment of the present application, the energy storage system has a seventh operating mode. In the seventh operating mode, the first pump is working, and 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 path of the condenser are connected end to end.

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

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

[0034] An energy storage system as described above;

[0035] A photovoltaic power generation system is used to supply power to the energy storage system.

[0036] According to the photovoltaic energy storage system of the present application, through the setting of the above-mentioned energy storage system, the collection and reuse of condensed water is realized. After the condensed water on the second evaporator is collected, it is 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. It not only reduces the energy consumption of the energy storage system, but also realizes the effective utilization of condensed water, meets the environmental protection requirements of energy conservation and emission reduction, and can realize the independent dehumidification function of the energy storage system, maximize the dehumidification effect, maintain the efficient operation of the energy storage battery and electronic devices, and can also extract part of the refrigerant in a specific mode for synchronous dehumidification, taking into account the thermal management needs and dehumidification needs, thereby increasing the practicality and usage width of the energy storage system, and adopts a valve group to integrate the thermal management flow path, reduce the volume of the liquid cooling unit, and improve the space utilization rate of the energy storage system. At the same time, multiple thermal management modes are realized to improve the comprehensive usage performance.

[0037] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0039] Figure 1 is a schematic diagram of the structure of the energy storage system provided in the embodiment of the present application;

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

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

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

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

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

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

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

[0047] Fig. 9 It is a schematic diagram of the structure of the energy storage system provided in the embodiment of the present application in the eighth working mode.

[0048] Reference numerals:

[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 device 14;

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

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

[0056] Spraying device 21 , spray head 211 , delivery pipe 212 , third pump 213 . DETAILED DESCRIPTION

[0057] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0058] The present application discloses an energy storage system 10 .

[0059] Reference below Figure 1-Figure 9 An energy storage system 10 according to an embodiment of the present application is described.

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

[0061] like Figure 1-Figure 9As shown, the refrigeration circuit 11 includes a compressor 111, a first path of a condenser 112 and an evaporator path, the evaporator path includes a first branch and a second branch connected in parallel, the first branch includes a first path of a first evaporator 114, the second branch includes a second evaporator 115, the second evaporator 115 is used for dehumidification, and at least one of the first branch and the second branch can be selectively connected to the compressor 111; the heat exchange part of the energy storage battery 12 is connected to the first path 13, and the first path 13 includes a first pump 131; the heat exchange part of the electronic device 14 is connected to the second path 15, and the second path 15 includes a second pump 151; a plurality of valve ports of the valve group are respectively connected between the second path of the condenser 112, the second path of the first evaporator 114, the first path 13, the second path 15 and the radiator 16; the water receiving tank 19 is located below the second evaporator 115 along the gravity direction, and is used to receive and accumulate condensed water; the spray device 21 is connected to the water receiving tank 19 and is suitable for facing the radiator 16.

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

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

[0064] Among them, the electronic device 14 can be a high-heat generating device in the energy storage system 10. Specifically, the electronic device 14 can include but is not limited to a power conversion component, a communication module, a detection module or an interactive module, etc. For example, in some embodiments, the electronic device 14 is a power conversion component.

[0065] The valve group is used to selectively connect or disconnect the second path of the condenser 112, the second path of the first evaporator 114, the first flow path 13 and the second flow path 15. By changing the connection relationship between the multiple valve ports of the valve group, the energy storage system 10 can be configured with multiple thermal management modes, and each thermal management mode has a different temperature control method for the energy storage battery 12 and the electronic device 14.

[0066] In actual implementation, Figure 1-Figure 9As shown, when the energy storage system 10 detects that the ambient humidity exceeds the set threshold, the compressor 111 starts to work, sucks in 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, and then enters the refrigerant distribution process, so that the high-pressure liquid refrigerant flows to the second evaporator 115. At this time, the first evaporator 114 may be in a closed state or a low-load operation state. The high-pressure liquid refrigerant expands and evaporates in the second evaporator 115, absorbing heat from the surrounding air, so that the surface temperature of the second evaporator 115 drops below the dew point, and the water vapor in the air condenses into water on the surface of the second evaporator 115, that is, condensed water. At the same time, the humidity in the air is significantly reduced, achieving a dehumidification effect. The condensed water condensed on the surface of the second evaporator 115 flows into the water receiving tank 19 by gravity. The water receiving tank 19 is located below the second evaporator 115 along the gravity direction, so that the condensed water can be collected smoothly. When the condensed water needs to be used for heat dissipation, the spray device 21 is started, and the condensed water enters the spray device 21 from the water receiving tank 19. The spray port of the spray device 21 is toward the radiator 16. The condensed water is sprayed out from the spray port of the spray device 21 and covers the surface of the radiator 16. The air heat absorbed by the surface of the radiator 16 is quickly dissipated into the air through the evaporation of the condensed water, thereby achieving efficient heat dissipation.

[0067] The energy storage system 10 provided in the embodiment of the present application realizes the collection and reuse of condensed water through the arrangement of the above-mentioned spraying device 21 and the water receiving tank 19. After the condensed water on the second evaporator 115 is collected, it is 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, which not only reduces the energy consumption of the energy storage system 10, but also realizes the effective utilization of condensed water, meets the environmental protection requirements of energy conservation and emission reduction, and can realize the independent dehumidification function of the energy storage system 10, maximize the dehumidification effect, maintain the efficient operation of the energy storage battery 12 and the electronic device 14, and can also extract part of the refrigerant in a specific mode for synchronous dehumidification, taking into account the thermal management requirements and dehumidification requirements, thereby increasing the practicality and usage width of the energy storage system 10, and adopting a valve group to integrate the thermal management flow path, reduce the volume of the liquid cooling unit, improve the space utilization rate of the energy storage system 10, and realize multiple thermal management modes to improve the comprehensive usage performance.

[0068] In some embodiments, Figure 1-Figure 9 As shown, the spray device 21 includes: a spray head 211 , a delivery pipe 212 and a third pump 213 .

[0069] The spraying port of the nozzle 211 faces the radiator 16 ; the inlet of the delivery pipe 212 is connected to the water receiving tank 19 , and the outlet of the delivery pipe 212 is connected to the nozzle 211 ; the third pump 213 is used to drive the condensed water in the delivery pipe 212 to flow.

[0070] The delivery pipe 212 is a pipe connected between the water receiving tank 19 and the nozzle 211, and is used to transport condensed water from the water receiving tank 19 to the nozzle 211. The inlet of the delivery pipe 212 can be connected to the bottom of the water receiving tank 19, or the inlet of the delivery pipe 212 can also be connected to the wall of the water receiving tank 19, which is not limited here.

[0071] For example, in some embodiments, Figure 1-Figure 9 As shown, the inlet of the delivery pipe 212 can be connected to the bottom of the water receiving tank 19.

[0072] The nozzle 211 is used to spray the condensed water in the form of mist or water column. The air heat absorbed by the surface of the radiator 16 is quickly dissipated into the air through the evaporation of the water mist, thereby achieving efficient 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 serves as a power source for the spray device 21 and is used to drive the condensed water in the delivery pipe 212 to flow. Through the action of the third pump 213, the condensed water can overcome the pipe resistance and be delivered from the water receiving tank 19 to the nozzle 211 and sprayed out.

[0074] It should be noted that in order to achieve a more precise control process, a liquid level sensor may be provided inside the water tank 19. When the condensed water accumulates to a certain amount, the liquid level sensor will send a signal to the control system of the energy storage system 10. The control system determines whether it is necessary to start the spray device 21 for heat dissipation operation based on the signal of the liquid level sensor. The condensed water that is not completely evaporated during the spraying process will flow back into the water tank 19 for recycling. Part of the evaporated water vapor may be discharged to the outside through the exhaust system of the energy storage system 10 or reabsorbed and utilized by other components in the energy storage system 10. When the condensed water in the water tank 19 is reduced to a certain level, the liquid level sensor will send a signal to the control system again. The control system adjusts the working state of the spray device 21 or starts other water replenishment measures according to actual needs.

[0075] The energy storage system 10 provided in the embodiment of the present application is provided with the above-mentioned nozzle 211, delivery pipe 212 and third pump 213. The spray port of the nozzle 211 is directly toward the radiator 16, so that the condensed water can directly act on the surface of the radiator 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 radiator 16, increase the heat dissipation area, and improve the heat dissipation efficiency, thereby significantly improving the heat dissipation capacity of the system, reducing the operating temperature of the energy storage battery 12 and the electronic device 14, and thus extending the service life of the energy storage battery 12 and the electronic device 14. At the same time, the overall structure of the spray device 21 is simple, and the functional division of each component is clear, thereby realizing the miniaturization and lightweight design of the spray device 21.

[0076] In some embodiments, Figure 1-Figure 9 As shown, the valve group 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 respectively 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. By changing the connectivity 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 a variety of thermal management modes.

[0079] The energy storage system 10 provided in the embodiment of the present application, through the arrangement of the first valve 101 and the second valve 102, utilizes the split design of the two valves, so that after the assembly is completed, the pipelines do not need to be stacked in the same position, which is convenient for relevant operators to identify the pipelines during maintenance and inspection, thereby improving the maintainability of the entire energy storage system 10, while reducing the complexity of pipe layout, shortening the working hours required for valve group assembly, and facilitating 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, a variety of thermal management modes are realized, thereby increasing the use width of the energy storage system 10.

[0080] In some embodiments, Figure 1-Figure 9 As shown, the energy storage system 10 further 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, Figure 2-Figure 9As shown, the various thermal management modes may include but are not limited to: first, in the independent dehumidification mode, the energy storage battery 12 does not perform thermal management, the radiator 16 can dissipate heat for 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; second, in the active cooling mode, the first evaporator 114 can dissipate heat for the energy storage battery 12, and the radiator 16 can dissipate heat for the electronic device 14 and the condenser 112; third, in the natural cooling mode, the radiator 16 can dissipate heat for the energy storage battery 12 and the electronic device 14; Fourth, 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; fifth, in the electric heating mode, the heater 18 can heat the energy storage battery 12; sixth, in the mixed 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; seventh, in the active temperature equalization mode, the coolant in the first flow path 13 is driven to circulate to promote the internal temperature equalization of the energy storage battery 12; eighth, in the liquid cooling mode of the electronic device 14, the radiator 16 can dissipate heat from the electronic device 14.

[0083] It should be noted that in the active cooling mode, heat pump heating mode and hybrid heating mode, since the compressor 111 is in working state, the first branch and the second branch can be connected to the compressor 111. Therefore, for the energy storage system 10, in addition to the dehumidification function in the above-mentioned independent dehumidification mode, it can also take into account the thermal management needs and dehumidification needs in the active cooling mode, heat pump heating mode and hybrid heating mode.

[0084] In this embodiment, if Figure 1-Figure 9 As shown, the first valve 101 can have 5 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 independent dehumidification mode, active refrigeration mode, natural cooling mode, heat pump heating mode, active temperature equalization mode and electronic device 14 liquid cooling mode, the heater is shut down at this time, and the connection between the fifth valve port A5 of the first valve 101 and the other valve ports can be directly disconnected, thereby shielding the pipeline where the heater 18 is located, so that the cooling water does not need to pass through the heater 18 during the circulation process.

[0085] The energy storage system provided in the embodiment of the present application, through the arrangement of the above-mentioned heater 18 and the first three-way valve 103, on the basis of waste heat heating of the electronic device 14 and heat pump heating, also provides heating schemes of heater 18 heating and heat pump heating combined with heater 18 heating for selection, and selects different heating schemes according to actual heat demand, thereby increasing the maximum total heating amount of the entire heating system, enhancing the adaptability of the energy storage system 10 in extremely cold weather, and refining the heating mode. At the same time, a double five-way valve design is adopted, and the first valve 101 can bypass the heater 18, so that in the independent dehumidification mode, active cooling mode, natural cooling mode, heat pump heating mode, active temperature equalization mode and electronic device 14 liquid cooling mode, the cooling water does not need to pass through the heater 19 during the circulation process, thereby reducing the coolant flow resistance of the circuit where the energy storage battery 12 is located in the above mode, thereby improving the system energy efficiency.

[0086] In some embodiments, Figure 1-Figure 9 As shown, the energy storage system 10 further 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 if Figure 7 As shown, since the electronic device 14 and the heater 18 jointly supplement heat on the first evaporator 114 side in the hybrid heating mode, from the flow direction of the coolant, the coolant in the second path leaving the first evaporator 114 will first flow through the heater 18 and then flow through the electronic device 14 for two heatings. Based on the extremely low ambient temperature in the hybrid heating mode, the temperature of the coolant will be higher than the ambient temperature at this time. If the coolant passes through the radiator afterwards, the coolant will exchange heat with the external environment in the process of passing through the radiator, thereby causing heat loss, which affects 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 hybrid heating mode, among the three valve ports of the second three-way valve 104, the valve port connected to the first valve port B1 of the second valve 102 and the valve port connected to the outlet of the second flow path 15 can be connected, 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, thereby maximizing the external heating capacity of the refrigeration circuit 11 in the hybrid heating mode.

[0090] In some embodiments, Figure 1-Figure 9As shown, the first branch also includes a first expansion valve 113, which is connected between the first path of the condenser 112 and the first path of the first evaporator 114, and the second branch also includes a second expansion valve 116, which is connected between the first path of the condenser 112 and the second evaporator 115.

[0091] In this embodiment, if Figure 1-Figure 9 As shown, the first branch includes a first expansion valve 113 and a first evaporator 114 connected in series, and 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 includes a second expansion valve 116 and a second evaporator 115 connected in series, and 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 a common expansion valve. In this case, the independent dehumidification mode cannot be implemented.

[0093] In some other embodiments, the first branch further includes an expansion valve, and the second branch further includes a switch valve. In this case, the refrigerant pressure and flow rate of the second branch cannot be controlled.

[0094] The energy storage system 10 provided in the embodiment of the present application can independently control the refrigerant flow of the first branch and the second branch through the configuration of the above-mentioned first expansion valve 113 and the second expansion valve 116 to meet different refrigeration needs or dehumidification needs, and at the same time more flexibly adjust the distribution of the refrigerant to meet the needs of different thermal management modes, support multi-mode efficient operation, optimize the thermal management efficiency of the entire energy storage system 10, and be able to more conveniently locate and handle problems during maintenance. If the expansion valve of a branch fails, it can be replaced separately without affecting the operation of the entire energy storage system 10.

[0095] In some embodiments, Figure 2 As shown, the energy storage system 10 has a first working mode. In the first working mode, the compressor 111, the condenser 112, the radiator 16, the second evaporator 115 and the second pump 151 are working, and the first pump 131 and the first evaporator 114 are not working; the second branch is connected to the compressor 111, and the second flow path 15, the radiator 16 and the second path of the condenser 112 are connected end to end in sequence.

[0096] In this embodiment, if 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 states of the valve ports of the first valve 101 and the second valve 102 are: the second valve port A2 of the first valve 101 is connected to the third valve port A3 of the first valve 101; the second valve port B2 of the second valve 102 is connected to the fifth valve port B5 of the second valve 102.

[0097] The energy storage system 10 provided in the embodiment of the present application, through the design of the above-mentioned first working mode, in this mode the system focuses on the dehumidification function, and the second evaporator 115, as a dedicated dehumidification element, absorbs moisture in the surrounding environment and condenses it into liquid water for discharge, thereby effectively reducing the ambient humidity. Since the first evaporator 114 does not participate in the work, the system can concentrate resources on the dehumidification task and improve the dehumidification efficiency, so that the energy storage system 10 can adapt to a wider range of environmental conditions, especially in high humidity environments. This is particularly important for some application scenarios with high humidity requirements, and by turning off the first pump 131 and the first evaporator 114, unnecessary energy consumption is reduced. In the use scenario where only dehumidification is required and no thermal management of the energy storage battery 12 is required, this design reduces energy waste and improves the overall energy efficiency of the energy storage system 10.

[0098] In some embodiments, 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 radiator 16, the first pump 131 and the second pump 151 are working; the first flow path 13 and the second path of the first evaporator 114 are connected end to end, and the second flow path 15, the radiator 16 and the second path of the condenser 112 are connected end to end in sequence.

[0099] In this embodiment, if Figure 3 As shown, the second working mode is the above-mentioned active cooling mode. When the energy storage system 10 switches to the second working mode, the first expansion valve 113 is opened, and the second expansion valve 116 is controlled to open and 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 connected to the fourth valve port A4 of the first valve 101, and the second valve port A2 of the first valve 101 is connected to the third valve port A3 of the first valve 101; the second valve port B2 of the second valve 102 is connected to the fifth valve port B5 of the second valve 102, and the third valve port B3 of the second valve 102 is connected to the fourth valve port B4 of the second valve 102.

[0100] The energy storage system 10 provided in the embodiment of the present application, through the design of the above-mentioned second working mode, realizes that when the temperature of the energy storage battery 12 is too high, the refrigeration circuit 11 is used to perform fluorine cooling on the energy storage battery 12, and the radiator 16 is used to dissipate heat for the electronic device 14 and the condenser 112, taking into account the heat dissipation requirements of the energy storage battery 12, the electronic device 14 and the condenser 112, and alleviating a series of domino effects caused by thermal runaway of the energy storage battery 12 due to overheating, thereby extending the working life of the energy storage battery 12.

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

[0102] In this embodiment, if Figure 4 As shown, the third working mode is the above-mentioned natural cooling mode. When the energy storage system 10 is switched to the third 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 connected to the fourth valve port A4 of the first valve 101, and the second valve port A2 of the first valve 101 is connected to the third valve port A3 of the first valve 101; the second valve port B2 of the second valve 102 is connected to the third valve port B3 of the second valve 102, and the fourth valve port B4 of the second valve 102 is connected to the fifth valve port B5 of the second valve 102.

[0103] The energy storage system 10 provided in the embodiment of the present application, through the design of the third working mode, realizes that when the temperature of the energy storage battery 12 is high, the radiator 16 is used to perform air cooling on the energy storage battery 12 and the electronic device 14, thereby meeting the basic heat dissipation demand of the energy storage battery 12 and preventing the refrigeration circuit 11 from being started as soon as the temperature of the energy storage battery 12 rises slightly, thereby causing unnecessary energy consumption, thereby improving the operating energy efficiency of the entire energy storage system 10 without affecting the performance of the energy storage battery 12 itself.

[0104] In some embodiments, Figure 5 As shown, the energy storage system 10 has a fourth working mode. In the fourth working mode, the compressor 111, the condenser 112, the first evaporator 114, the first pump 131 and the second pump 151 are working, and the radiator 16 is not working; the first flow path 13 and the second path of the condenser 112 are connected end to end, and the second flow path 15, the radiator 16 and the second path of the first evaporator 114 are connected end to end in sequence.

[0105] In this embodiment, if 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 and close according to actual needs. The on-off status 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 connected to the second valve port A2 of the first valve 101, and the third valve port A3 of the first valve 101 is connected to the fourth valve port A4 of the first valve 101; the second valve port B2 of the second valve 102 is connected to the third valve port B3 of the second valve 102, and the fourth valve port B4 of the second valve 102 is connected to the fifth valve port B5 of the second valve 102.

[0106] The energy storage system 10 provided in the embodiment of the present application, through the design of the above-mentioned fourth working mode, realizes that when the temperature of the energy storage battery 12 is too low, the condenser 112 of the refrigeration circuit 11 is used to heat the energy storage battery 12, so that the energy storage battery 12 can work normally in a low temperature environment, thereby optimizing the performance of the energy storage system 10. At the same time, the waste heat of the electronic device 14 is used to supplement the heat of the low-pressure end of the refrigerant cycle, thereby achieving the effect of combined heating of the electronic device 14 and the compressor 111.

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

[0108] In this embodiment, if 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 status 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 connected to the fifth valve port A5 of the first valve 101; the third valve port B3 of the second valve 102 is connected to the fourth valve port B4 of the second valve 102.

[0109] The energy storage system 10 provided in the embodiment of the present application, through the design of the fifth working mode, realizes that when the temperature of the energy storage battery 12 is low, the heater 18 is used to heat the energy storage battery 12, thereby meeting the basic heat demand of the energy storage battery 12 in a low temperature environment, and preventing the energy storage battery 12 from switching to the heat pump heating mode when the temperature drops slightly, thereby causing unnecessary energy consumption, thereby improving the operating energy efficiency of the entire energy storage system 10 without affecting the performance of the energy storage battery 12 itself.

[0110] In some embodiments, Figure 7As shown, the energy storage system 10 has a sixth working mode. In the sixth working mode, the compressor 111, the condenser 112, the first evaporator 114, the first pump 131, the second pump 151 and the heater 18 are working, and the radiator 16 is not working; the first flow path 13 and the second path of the condenser 112 are connected end to end, and the second flow path 15, the second path of the first evaporator 114 and the heater 18 are connected end to end in sequence.

[0111] In this embodiment, if Figure 7 As shown, 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, and the second expansion valve 116 is controlled to open and 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 connected to the second valve port A2 of the first valve 101, and the third valve port A3 of the first valve 101 is connected to the fifth valve port A5 of the first valve 101; the first valve port B1 of the second valve 102 is connected to the fourth valve port B4 of the second valve 102, and the second valve port B2 of the second valve 102 is connected to the third valve port B3 of the second valve 102.

[0112] The energy storage system 10 provided in the embodiment of the present application, through the design of the above-mentioned sixth working mode, realizes that when the temperature of the energy storage battery 12 is too low, heat is provided by heating with the heater 18, waste heat from the electronic device 14 and heating by the compressor 111. The first flow path 13 is connected with the second path of the condenser 112 so that the condenser 112 directly heats the energy storage battery 12, and the second flow path 15 is connected with the heater 18 and the evaporator so that the waste heat from the heater 18 and the electronic device 14 supplements the heat to the low-pressure end, thereby achieving excess thermal power output, thereby increasing the heating power, and accelerating the temperature rise rate of the energy storage battery 12 in an extremely cold environment.

[0113] In some embodiments, Figure 8 As shown, the energy storage system 10 has a seventh working mode. In the seventh working mode, the first pump 131 is working, and the compressor 111, the condenser 112, the first evaporator 114, the second evaporator 115, the radiator 16 and the second pump 151 are not working; the first flow path 13 and the second path of the condenser 112 are connected end to end.

[0114] In this embodiment, if Figure 8 As shown, the seventh working mode is the above-mentioned active temperature equalization mode. When the energy storage system 10 switches to the seventh working mode, the on-off states of the valve ports of the first valve 101 and the second valve 102 are: the first valve port A1 of the first valve 101 is connected to the second valve port A2 of the first valve 101; the second valve port B2 of the second valve 102 is connected to the third valve port B3 of the second valve 102.

[0115] The energy storage system 10 provided in the embodiment of the present application, through the design of the seventh working mode, uses the coolant circulation to actively evenly temperature the entire energy storage system 10. Considering that the heat dissipation pressure of the system is relatively small at this time, no additional heat dissipation configuration is required, thereby improving the temperature uniformity of multiple battery cells in the energy storage battery 12, and at the same time improving the temperature uniformity of the entire energy storage system 10 when the ambient temperature is moderate.

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

[0117] In this embodiment, if Fig. 9 As shown, the eighth working mode is the liquid cooling mode of the electronic device 14. When the energy storage system 10 is switched to the eighth working mode, the on-off states of the valve ports of the first valve 101 and the second valve 102 are as follows: the second valve port A2 of the first valve 101 is connected to the third valve port A3 of the first valve 101; the second valve port B2 of the second valve 102 is connected to the fifth valve port B5 of the second valve 102.

[0118] The energy storage system 10 provided in the embodiment of the present application, through the design of the above-mentioned eighth working mode, only starts the second pump 151 and the radiator 16, and uses natural heat dissipation to cool the electronic device 14. When high-intensity cooling or refrigeration is not required, the compressor 111, the condenser 112, the evaporator and other high-energy consumption equipment are turned off, 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 actual needs, without running a complete refrigeration cycle in all cases, simplifying the control logic and operation process of the energy storage system 10, and improving the reliability and response speed of the energy storage system 10.

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

[0120] In some embodiments, the photovoltaic energy storage system includes: 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 may include photovoltaic modules and inverter units. The energy storage battery 12 in the energy storage system 10 may be connected to the direct current output by the photovoltaic modules, and other power modules in the energy storage system 10 may be connected to the alternating current output by the inverter unit.

[0123] The photovoltaic energy storage system provided in the embodiment of the present application realizes the collection and reuse of condensed water through the setting of the above-mentioned energy storage system 10. After the condensed water on the second evaporator 115 is collected, it is 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, which not only reduces the energy consumption of the energy storage system 10, but also realizes the effective utilization of condensed water, meets the environmental protection requirements of energy conservation and emission reduction, and can realize the independent dehumidification function of the energy storage system 10, maximize the dehumidification effect, maintain the efficient operation of the energy storage battery 12 and the electronic device 14, and can also extract part of the refrigerant in a specific mode for synchronous dehumidification, taking into account the thermal management requirements and dehumidification requirements, thereby increasing the practicality and usage width of the energy storage system 10, and adopts a valve group to integrate the thermal management flow path, reduce the volume of the liquid cooling unit, improve the space utilization rate of the energy storage system 10, and realize multiple thermal management modes to improve the comprehensive usage performance.

[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 interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0125] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0126] In the description of this application, "first feature" or "second feature" may include one or more of the features.

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

[0128] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0129] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0130] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0131] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An energy storage system, characterized in that: include: A refrigeration circuit, the refrigeration circuit includes a compressor, a first path of a condenser and an evaporator flow path, the evaporator flow path includes a first branch and a second branch connected in parallel, the first branch includes a first path of a first evaporator, the second branch includes a second evaporator, the second evaporator is used for dehumidification, and at least one of the first branch and the second branch can be selectively connected to the compressor; An energy storage battery and a first flow path, wherein a heat exchange portion 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, a heat exchange portion of the electronic device is connected to the second flow path, and the second flow path includes a second pump; heat sink; A valve group, wherein a plurality of valve ports of the valve group 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; A water receiving tank, the water receiving tank is located below the second evaporator along the gravity direction and is used to receive and accumulate condensed water; A spray device is connected to the water receiving tank and is suitable for facing the radiator.

2. The energy storage system according to claim 1, characterized in that: The spraying device comprises: a nozzle, wherein a spray port of the nozzle is directed toward the radiator; A delivery pipe, wherein the inlet of the delivery pipe is connected to the water receiving tank, and the outlet of the delivery pipe is connected to the nozzle; The third pump is used to drive the condensed water in the delivery pipe to flow.

3. The energy storage system according to claim 1, characterized in that: The valve group comprises: a first valve, wherein a first valve port of the first valve is connected to an inlet of the first flow path, a second valve port of the first valve is connected to an outlet of the second path of the condenser, a third valve port of the first valve is connected to an inlet of the second flow path, and a fourth valve port of the first valve is connected to an outlet of the second path of the first evaporator; A second valve, a first valve port of the second valve is connected to the inlet of the radiator, a second valve port of the second valve is connected to the inlet of the second path of the condenser, a third valve port of the second valve is connected to the outlet of the first flow path, a fourth valve port of the second valve is connected to the inlet of the second path of the first evaporator, and a fifth valve port of the second valve is connected to the outlet of the radiator.

4. The energy storage system according to claim 3, characterized in that: Also includes: A heater and a first three-way valve, wherein 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 is connected to 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.

5. The energy storage system according to claim 3, characterized in that: Also includes: A second three-way valve, wherein three valve ports of the second three-way valve are respectively connected to the first valve port of the second valve, the inlet of the radiator and the outlet of the second flow path, and the heat exchange part of the electronic device is connected between the second three-way valve and the second pump.

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

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

8. The energy storage system according to any one of claims 1 to 6, characterized in that: 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 are in operation; 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.

9. The energy storage system according to any one of claims 1 to 6, characterized in that: The energy storage system has a third working mode. In the third working mode, 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 path of the condenser, the second flow path, the radiator and the second path of the first evaporator are connected end to end in sequence.

10. The energy storage system according to any one of claims 1 to 6, 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 working, and the radiator is not working; 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.

11. The energy storage system according to claim 4, characterized in that: The energy storage system has a fifth working mode. In the fifth working mode, the first pump is working, and 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 end to end in sequence.

12. The energy storage system according to claim 4, 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 working, and the radiator is not working; 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.

13. The energy storage system according to any one of claims 1 to 6, characterized in that: The energy storage system has a seventh working mode. In the seventh working mode, 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 end to end.

14. The energy storage system according to any one of claims 1 to 6, characterized in that: The energy storage system has an eighth working mode. In the eighth working mode, the second pump and the radiator are working, and the compressor, the condenser, the first evaporator, the second evaporator and the first pump are not working; the second flow path, the radiator and the second path of the condenser are connected end to end in sequence.

15. A photovoltaic energy storage system, characterized in that: include: The energy storage system according to any one of claims 1 to 14; A photovoltaic power generation system is used to supply power to the energy storage system.

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