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. In the energy storage system, a refrigerating loop comprises a compressor, a first path of a condenser, a first expansion valve and a first path of an evaporator; a heat exchange part of the energy storage battery is communicated with a first flow path, and the first flow path comprises a first pump and a heater; a first heat sink; the heat exchange part of the electronic device is communicated with a second flow path, and the second flow path comprises a second pump and a second radiator; a plurality of valve ports of the valve group are respectively connected with the second path of the condenser, the second path of the evaporator, the first radiator, the first flow path and the second flow path, and the valve ports can be selectively opened and closed. By using the structure, energy storage batteries and electronic devices with different water inlet temperature requirements respectively adopt the corresponding radiators for independent heat dissipation, so that the heat exchange capability requirements of the radiators are reduced, and the manufacturing cost and the maintenance cost are reduced.

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 technology, especially the use of clean energy such as solar energy and wind energy, how to efficiently store and utilize these intermittent energy sources has become an increasingly prominent issue. Current energy storage systems mostly use electrochemical energy storage, but these systems often have defects such as low energy conversion efficiency, slow response speed and poor environmental adaptability. Especially under extreme climatic conditions such as high or low temperatures, the efficiency and stability of the energy storage system will be seriously affected.

[0003] In related technologies, the thermal management of energy storage systems mainly relies on chillers and liquid-cooled heat exchangers, through which the energy storage batteries are cooled or heated. However, this thermal management method may not be able to meet the growing scale and density of energy storage systems, and often has problems such as insufficient cooling efficiency, long response time, and high energy consumption. It is even more inadequate in extremely cold or high temperature environments. Due to the relatively single thermal management method, it is difficult to achieve precise temperature control and heat balance, and it is overly dependent on the refrigeration system, resulting in excessive energy consumption of the entire system during the cycle, which in turn affects the overall operating efficiency of the energy storage system. Summary of the invention

[0004] 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 reduce the heat exchange capacity requirements of the first radiator and the second radiator, reduce the overall energy consumption of the system, reduce the manufacturing cost and maintenance cost, realize multiple thermal management modes, reduce the excessive use of the refrigeration circuit, improve the system operation energy efficiency, improve the integration of water side components, and improve the energy density of the energy storage system.

[0005] In a first aspect, the present application provides an energy storage system, comprising:

[0006] a refrigeration circuit, the refrigeration circuit comprising a compressor, a first circuit of a condenser, a first expansion valve and a first circuit of an evaporator;

[0007] 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 and a heater;

[0008] first radiator;

[0009] An electronic device and a second flow path, wherein a heat exchange portion of the electronic device is connected to the second flow path, and the second flow path includes a second pump and a second radiator;

[0010] A valve group, wherein the multiple valve ports of the valve group are respectively connected to the second path of the condenser, the second path of the evaporator, the first radiator, the first flow path and the second flow path, and the multiple valve ports of the valve group can be selectively opened and closed.

[0011] According to the energy storage system of the present application, through the configuration of the above-mentioned first radiator, second radiator and valve group, corresponding radiators are used for separate heat dissipation of energy storage batteries and electronic devices with different water inlet temperature requirements, thereby reducing the heat exchange capacity requirements of the first radiator and the second radiator, reducing the overall energy consumption of the system, and thus effectively reducing manufacturing costs and maintenance costs; at the same time, it is possible to use water circulation switching to achieve a variety of thermal management modes, reduce excessive use of the refrigeration circuit, and reduce energy consumption throughout the product life cycle, thereby improving comprehensive performance, and thus improving system operation energy efficiency; and improving the integration of water-side components, thereby reducing the volume of the liquid cooling unit, and thus improving the energy density of the energy storage system.

[0012] 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 first pump, the first radiator, the second pump and the second radiator are all working, the heater is stopped, the first radiator, the second path of the condenser and the second flow path are connected end to end in sequence; the second path of the evaporator and the first flow path are connected end to end.

[0013] According to one embodiment of the present application, the energy storage system has a second operating mode. In the second operating mode, the first pump, the first radiator, the second pump and the second radiator are all working, the compressor and the heater are stopped, the second path of the condenser and the second flow path are connected end to end, and the second path of the evaporator, the first flow path and the first radiator are connected end to end in sequence.

[0014] According to one embodiment of the present application, the energy storage system has a third operating mode. In the third operating mode, the first pump and the heater are working, the compressor, the first radiator, the second pump and the second radiator are all stopped, and the second path of the evaporator is connected end to end with the first flow path.

[0015] According to one embodiment of the present application, the energy storage system further includes:

[0016] a water tank, wherein an air inlet of the water tank can be selectively communicated with the first flow path, and at least one of the first flow path and the second flow path is provided with a liquid replenishing port;

[0017] The energy storage system has a fourth operating mode. In the fourth operating mode, the first pump and the second pump are working, the compressor, the first radiator, the second radiator and the heater are all stopped, the second path of the evaporator, the first flow path, the first radiator, the second path of the condenser and the second flow path are connected end to end in sequence, and the air inlet of the water tank is connected to the first flow path.

[0018] According to one embodiment of the present application, the energy storage system has a fifth operating mode. In the fifth operating mode, the first pump is working, the compressor, the first radiator, the second pump, the second radiator and the heater are all stopped, and the second path of the evaporator and the first flow path are connected end to end.

[0019] 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 first pump, the first radiator, the second pump and the second radiator are all working, the second path of the condenser and the first flow path are connected end to end, and the second path of the evaporator, the second flow path and the first radiator are connected end to end in sequence.

[0020] According to an embodiment of the present application, the inlet of the first flow path is connected to the outlet of the second flow path of the evaporator, and the inlet of the second flow path is connected to the outlet of the second flow path of the condenser; the valve group includes:

[0021] A first valve and a second valve, wherein the first valve port of the first valve is connected to the inlet of the first radiator, the second valve port of the first valve is connected to the fourth valve port of the second valve, the third valve port of the first valve is connected to the inlet of the second path of the evaporator, and the fourth valve port of the first valve is connected to the outlet of the first flow path; the first valve port of the second valve is connected to the outlet of the second flow path, the second valve port of the second valve is connected to the inlet of the second path of the condenser, and the third valve port of the second valve is connected to the outlet of the first radiator.

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

[0023] a first three-way valve, wherein three valve ports of the first three-way valve are respectively connected to the fifth valve port of the first valve, the third valve port of the second valve, and the outlet of the first radiator;

[0024] A second three-way valve, wherein three valve ports of the second three-way valve are respectively connected to the inlet of the second radiator, the outlet of the heat exchange portion of the electronic device and the fifth valve port of the second valve.

[0025] According to one embodiment of the present application, the valve group has first to tenth valve ports, wherein the first valve port is connected to the outlet of the first radiator, the second valve port is connected to the inlet of the first radiator, the third valve port is connected to the outlet of the second flow path, the fourth valve port is connected to the outlet of the first flow path, the fifth valve port is connected to the inlet of the second flow path, the sixth valve port is connected to the inlet of the first flow path, the seventh valve port is connected to the outlet of the second path of the condenser, the eighth valve port is connected to the outlet of the second path of the evaporator, the ninth valve port is connected to the inlet of the second path of the condenser, and the tenth valve port is connected to the inlet of the second path of the evaporator.

[0026] According to one embodiment of the present application, the valve group includes:

[0027] a third valve, wherein a first valve port of the third valve is connected to the outlet of the first radiator, a second valve port of the third valve is connected to the inlet of the first radiator, a third valve port of the third valve is connected to the outlet of the second flow path, a fourth valve port of the third valve is connected to the outlet of the first flow path, a fifth valve port of the third valve is connected to the inlet of the second path of the condenser, and a sixth valve port of the third valve is connected to the inlet of the second path of the evaporator;

[0028] A fourth valve, wherein a first valve port of the fourth valve is connected to the inlet of the second flow path, a second valve port of the fourth valve is connected to the outlet of the second path of the condenser, a third valve port of the fourth valve is connected to the inlet of the first flow path, and a fourth valve port of the fourth valve is connected to the outlet of the second path of the evaporator.

[0029] According to one embodiment of the present application, the valve group includes:

[0030] The fifth valve, the sixth valve and the seventh valve, the first valve port of the fifth valve is connected to the outlet of the first radiator, the second valve port of the fifth valve is connected to the inlet of the second path of the condenser, the third valve port of the fifth valve is connected to the fourth valve port of the seventh valve, and the fourth valve port of the fifth valve is connected to the inlet of the second path of the evaporator; the first valve port of the sixth valve is connected to the inlet of the second flow path, the second valve port of the sixth valve is connected to the outlet of the second path of the condenser, the third valve port of the sixth valve is connected to the inlet of the first flow path, and the fourth valve port of the sixth valve is connected to the outlet of the second path of the evaporator; the first valve port of the seventh valve is connected to the outlet of the second flow path, the second valve port of the seventh valve is connected to the inlet of the first radiator, and the third valve port of the seventh valve is connected to the outlet of the first flow path.

[0031] According to one embodiment of the present application, the refrigeration circuit further includes:

[0032] A dehumidification branch is connected in parallel to a series passage formed by the first path of the evaporator and the first expansion valve, and the dehumidification branch includes a dehumidification heat exchanger and a second expansion valve.

[0033] According to one embodiment of the present application, the energy storage system further includes:

[0034] A water receiving tank, the water receiving tank is located below the dehumidification heat exchanger along the gravity direction and is used to receive and accumulate condensed water;

[0035] A spray device is connected to the water receiving tank, and a spray port of the spray device is suitable for facing at least one of the first radiator and the second radiator.

[0036] In a second aspect, the present application provides a photovoltaic energy storage system, the photovoltaic energy storage system comprising:

[0037] Such as the energy storage system mentioned above;

[0038] A photovoltaic power generation system is used to supply power to the energy storage system.

[0039] According to the photovoltaic energy storage system of the present application, through the configuration of the above-mentioned energy storage system, energy storage batteries and electronic devices with different water inlet temperature requirements are separately cooled by corresponding radiators, thereby reducing the heat exchange capacity requirements of the first radiator and the second radiator, reducing the overall energy consumption of the system, and thus effectively reducing manufacturing costs and maintenance costs; at the same time, it is possible to use water circulation switching to achieve a variety of thermal management modes, reduce excessive use of the refrigeration circuit, and reduce energy consumption throughout the product life cycle, thereby improving comprehensive performance, and thus improving system operation energy efficiency; and improving the integration of water-side components, thereby reducing the volume of the liquid cooling unit, and thus improving the energy density of the energy storage system.

[0040] 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

[0041] 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:

[0042] Figure 1 It is one of the structural schematic diagrams of the energy storage system provided in the embodiment of the present application;

[0043] Figure 2 This is one of the structural schematic diagrams of the energy storage system provided in the embodiment of the present application in the first working mode;

[0044] Figure 3This is one of the structural schematic diagrams of the energy storage system provided in the embodiment of the present application in the second working mode;

[0045] Figure 4 It is one of the structural schematic diagrams of the energy storage system provided in the embodiment of the present application in the third working mode;

[0046] Figure 5 is one of the structural schematic diagrams of the energy storage system provided in the embodiment of the present application in the fourth working mode;

[0047] Figure 6 It is one of the structural schematic diagrams of the energy storage system provided in the embodiment of the present application in the fifth working mode;

[0048] Figure 7 This is the second structural diagram of the energy storage system provided in the embodiment of the present application;

[0049] Figure 8 This is the third structural diagram of the energy storage system provided in the embodiment of the present application;

[0050] Fig. 9 This is the second structural diagram of the energy storage system provided in the embodiment of the present application in the first working mode;

[0051] Fig.10 This is the second structural diagram of the energy storage system provided in the embodiment of the present application in the second working mode;

[0052] Fig.11 This is the second structural schematic diagram of the energy storage system in the third working mode provided in the embodiment of the present application;

[0053] Fig.12 This is the second structural schematic diagram of the energy storage system in the fourth working mode provided in the embodiment of the present application;

[0054] Fig.13 This is the second structural schematic diagram of the energy storage system provided in the embodiment of the present application in the fifth working mode;

[0055] Fig.14 is one of the structural schematic diagrams of the energy storage system provided in the embodiment of the present application in the sixth working mode;

[0056] Fig.15 This is the fourth structural diagram of the energy storage system provided in the embodiment of the present application;

[0057] Fig.16 This is the third structural diagram of the energy storage system provided in the embodiment of the present application in the first working mode;

[0058] Fig.17 This is the third structural diagram of the energy storage system provided in the embodiment of the present application in the second working mode;

[0059] Fig.18 This is the third structural diagram of the energy storage system in the third working mode provided in the embodiment of the present application;

[0060] Fig.19 This is the third structural schematic diagram of the energy storage system in the fourth working mode provided in the embodiment of the present application;

[0061] Fig. 20 This is the third structural diagram of the energy storage system in the fifth working mode provided in the embodiment of the present application;

[0062] Fig.21 This is the second structural schematic diagram of the energy storage system in the sixth working mode provided in the embodiment of the present application;

[0063] Fig. 22 This is the fifth structural diagram of the energy storage system provided in the embodiment of the present application;

[0064] Fig.23 This is the fourth structural diagram of the energy storage system provided in the first working mode according to the embodiment of the present application;

[0065] Fig.24 This is the fourth structural diagram of the energy storage system provided in the second working mode according to the embodiment of the present application;

[0066] Fig.25 This is the fourth structural schematic diagram of the energy storage system in the third working mode provided in the embodiment of the present application;

[0067] Fig.26 This is a fourth structural diagram of the energy storage system in the fourth working mode provided in an embodiment of the present application;

[0068] Fig. 27 This is the fourth structural diagram of the energy storage system in the fifth working mode provided in the embodiment of the present application;

[0069] Fig.28 This is the third structural diagram of the energy storage system in the sixth working mode provided in the embodiment of the present application;

[0070] Fig.29 This is the sixth structural diagram of the energy storage system provided in the embodiment of the present application.

[0071] Reference numerals:

[0072] Energy storage system 10, first three-way valve 101, second three-way valve 102;

[0073] Refrigeration circuit 11, compressor 111, condenser 112, first expansion valve 113, evaporator 114, liquid storage tank 115, dehumidification heat exchanger 116, second expansion valve 117;

[0074] Energy storage battery 12;

[0075] A first flow path 13, a first pump 131, and a heater 132;

[0076] A first heat sink 14, an electronic device 15;

[0077] A second flow path 16, a second pump 161, and a second radiator 162;

[0078] Water tank 17, water receiving trough 18;

[0079] Spraying device 19, spray head 191, delivery pipe 192, third pump 193;

[0080] Valve group 21 , first valve 211 , second valve 212 , third valve 213 , fourth valve 214 , fifth valve 215 , sixth valve 216 , seventh valve 217 . DETAILED DESCRIPTION

[0081] 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.

[0082] The present application discloses an energy storage system 10 .

[0083] Reference below Figure 1-Figure 29 Describe the energy storage system 10 according to an embodiment of the present application.

[0084] In some embodiments, Figure 8 As shown, the energy storage system 10 includes: a refrigeration circuit 11, an energy storage battery 12, a first flow path 13, a first radiator 14, an electronic device 15, a second flow path 16 and a valve group 21.

[0085] like Figure 1 , Figure 7 , Figure 8 , Fig.15 , Fig. 22 and Fig.29As shown, the refrigeration circuit 11 includes a compressor 111, a first path of the condenser 112, a first expansion valve 113 and a first path of the evaporator 114; the heat exchange part of the energy storage battery 12 is connected to the first flow path 13, and the first flow path 13 includes a first pump 131 and a heater 132; the heat exchange part of the electronic device 15 is connected to the second flow path 16, and the second flow path 16 includes a second pump 161 and a second radiator 162; the multiple valve ports of the valve group 21 are respectively connected to the second path of the condenser 112, the second path of the evaporator 114, the first radiator 14, the first flow path 13 and the second flow path 16, and the multiple valve ports of the valve group 21 can be selectively opened and closed.

[0086] like Figure 1 , Figure 7 , Figure 8 , Fig.15 , Fig. 22 and Fig.29 As shown, the refrigeration circuit 11 may further include a liquid storage tank 115 , which may be used to separate liquid refrigerant from refrigerant vapor, and the liquid storage tank 115 may be located between the first path of the condenser 112 and the first expansion valve 113 .

[0087] 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 coolant in the second flow path 16 can exchange heat with the heat exchange part of the electronic device 15 to achieve thermal management of the electronic device 15.

[0088] Among them, the electronic device 15 can be a high-heat generating device in the energy storage system 10. Specifically, the electronic device 15 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 15 is a power conversion component.

[0089] It is understandable that, taking the inverter as an example of an electronic device, the operating temperature range and heat dissipation requirements of the energy storage battery and the inverter are different. Specifically, the energy storage battery usually operates best between 20°C and 35°C, while the inverter can operate in a wider temperature range (25°C to 60°C). In the related art, the energy storage battery and the inverter are connected in series in the same circuit and use the same radiator for heat dissipation. In this case, the different heat dissipation requirements of the two cannot be met. For example, if the design of the radiator is mainly based on the heat dissipation requirements of the inverter, the energy storage battery cannot be sufficiently cooled. Conversely, if the design of the radiator is mainly based on the heat dissipation requirements of the energy storage battery, then the requirements for the heat exchange capacity of the radiator are more stringent, and a large-scale and more complex radiator needs to be selected, which greatly increases the thermal management cost and maintenance cost of the energy storage system, and also seriously affects the energy efficiency ratio of the system.

[0090] In actual implementation, Figure 2-Figure 6 , Figure 9-14 , Figure 16-Figure 21 and Figure 23-Figure 28 As shown, the energy storage system 10 can be configured with multiple thermal management modes, and each thermal management mode has different temperature control methods for the energy storage battery 12 and the electronic device 15. The multiple thermal management modes may include but are not limited to: first, in the active cooling mode, the evaporator 114 of the refrigeration circuit 11 can dissipate heat for the energy storage battery 12, and the first radiator 14 and the second radiator 162 can dissipate heat for the electronic device 15 and the condenser 112 of the refrigeration circuit 11; second, in the natural cooling mode, the first radiator 14 can dissipate heat for the energy storage battery 12, and the second radiator 162 can dissipate heat for the electronic device 15; third, in the electric heating mode, the heater 132 The energy storage battery 12 can be heated; fourth, in the active temperature equalization mode, the coolant is driven to circulate to promote the internal temperature equalization of the energy storage battery 12; fifth, in the liquid replenishment and exhaust mode, the liquid replenishment port and the exhaust port of the water side component are connected, and the coolant replenishment and internal gas discharge are completed during the circulation of the coolant; sixth, in the heat pump heating mode, the condenser 112 can heat the energy storage battery 12, and the electronic device 15, the first radiator 14 and the second radiator 162 can supplement the heat for the evaporator 114. If the heat provided by the refrigeration circuit 11 is still insufficient to meet the demand, the condenser 112 combined with the heater 132 can heat the energy storage battery 12 together.

[0091] It should be noted that, in the natural cooling mode, the fan speed of the first radiator 14 can be controlled according to the water inlet temperature of the energy storage battery 12 , and the fan speed of the second radiator 162 can be controlled according to the water inlet temperature of the electronic device 15 .

[0092] The energy storage system 10 provided in the embodiment of the present application, through the arrangement of the above-mentioned first radiator 14, the second radiator 162 and the valve group 21, uses corresponding radiators to perform separate heat dissipation for the energy storage battery 12 and the electronic device 15 with different water inlet temperature requirements, thereby reducing the heat exchange capacity requirements of the first radiator 14 and the second radiator 162, reducing the overall energy consumption of the system, and thus effectively reducing the manufacturing cost and maintenance cost; at the same time, it can realize a variety of thermal management modes by switching the water circuit circulation, reduce the excessive use of the refrigeration circuit 11, and reduce the energy consumption of the product throughout its life cycle, thereby improving the comprehensive use performance, and thus improving the system operation energy efficiency; and improve the integration of water-side components, thereby reducing the volume of the liquid cooling unit, and thus improving the energy density of the energy storage system 10.

[0093] In some embodiments, the inlet of the first flow path 13 can be connected to the outlet of the second path of the evaporator 114 , and the inlet of the second flow path 16 can be connected to the outlet of the second path of the condenser 112 ; the valve group 21 may include: a first valve 211 and a second valve 212 .

[0094] like Figure 1-Figure 6 As shown, the first valve port A1 of the first valve 211 can be connected to the inlet of the first radiator 14, the second valve port A2 of the first valve 211 can be connected to the fourth valve port B4 of the second valve 212, the third valve port A3 of the first valve 211 can be connected to the inlet of the second path of the evaporator 114, and the fourth valve port A4 of the first valve 211 can be connected to the outlet of the first flow path 13; the first valve port B1 of the second valve 212 can be connected to the outlet of the second flow path 16, the second valve port B2 of the second valve 212 can be connected to the inlet of the second path of the condenser 112, and the third valve port B3 of the second valve 212 can be connected to the outlet of the first radiator 14.

[0095] In this embodiment, if Figure 1-Figure 6 As shown, the first valve 211 can have four valve ports, and the second valve 212 can have four valve ports, wherein one valve port of the first valve 211 and one valve port of the second valve 212 can be connected to each other, and the other three valve ports of the first valve 211 and the other three valve ports of the second valve 212 can be respectively connected to the inlet and outlet of the first radiator 14, the inlet of the second path of the condenser 112, the inlet of the second path of the evaporator 114, the outlet of the first flow path 13 and the outlet of the second flow path 16. By changing the connectivity between the four valve ports of the first valve 211 and the four valve ports of the second valve 212, the relationship between the first radiator 14, the second path of the condenser 112, the second path of the evaporator 114, the first flow path 13 and the second flow path 16 can be changed to realize active cooling mode, natural cooling mode, electric heating mode, active temperature equalization mode and liquid replenishment and exhaust mode.

[0096] The energy storage system 10 provided in the embodiment of the present application, through the configuration of the above-mentioned first valve 211 and the second valve 212, combined with the design that the first valve 211 has four valve ports and the second valve 212 has four valve ports, takes into account that the heat pump heating mode is less frequently used in actual applications. Under the premise of not affecting the core thermal management function of the energy storage system 10, the number of valve ports is reduced as much as possible, thereby significantly simplifying the water channel structure, further improving the energy density of the energy storage system 10, and reducing the complexity of pipe layout and the difficulty of designing the control system, so that the energy storage system 10 can be applied to common scenarios with greater cost advantages, and the miniaturization and lightweight design of the energy storage system 10 are realized.

[0097] In some embodiments, Figure 7 As shown, the energy storage system 10 may further include: a first three-way valve 101 and a second three-way valve 102 .

[0098] like Figure 7As shown, the three valve ports of the first three-way valve 101 can be respectively connected to the fifth valve port A5 of the first valve 211, the third valve port B3 of the second valve 212 and the outlet of the first radiator 14; the three valve ports of the second three-way valve 102 can be respectively connected to the inlet of the second radiator 162, the outlet of the heat exchange part of the electronic device 15 and the fifth valve port B5 of the second valve 212.

[0099] In this embodiment, if Figure 7 As shown, on the basis of the four valve ports of the first valve 211 and the four valve ports of the second valve 212, a fifth valve port A5 is added to the first valve 211, and a fifth valve port B5 is also added to the second valve 212, and two branches are added to the original pipeline layout, a first three-way valve 101 is arranged at the outlet of the first radiator 14, and the first three-way valve 101 is connected to the newly added fifth valve port A5 on the first valve 211 through one of the branches, and a second three-way valve 102 is arranged at the inlet of the second radiator 162, and the second three-way valve 102 is arranged at the inlet of the second radiator 162. The three-way valve 102 is connected to the fifth valve port B5 newly added on the second valve 212 through another branch. Considering that the above simplified solution does not have a heat pump heating mode, in order to further meet the heating needs of the energy storage battery 12 in an extremely cold environment, when the energy storage system 10 includes the first three-way valve 101 and the second three-way valve 102, the energy storage system 10 also includes a waste heat utilization mode. In the waste heat utilization mode, the second valve port A2 of the first valve 211 is connected to the third valve port A3 of the first valve 211, and the fourth valve port A4 of the first valve 211 is connected to the The fifth valve port A5 of the first valve 211 is connected, the second valve port B2 of the second valve 212 is connected to the third valve port B3, the fourth valve port B4 of the second valve 212 is connected to the fifth valve port B5 of the second valve 212, the valve port on the first three-way valve 101 connected to the third valve port B3 of the second valve 212 is connected to the valve port on the first three-way valve 101 connected to the fifth valve port A5 of the first valve 211, the valve port on the second three-way valve 102 connected to the outlet of the heat exchange part of the electronic device 15 is connected to the valve port on the second three-way valve 102 connected to the outlet of the first valve 2 The coolant passes through the valve port connected to the fifth valve port A5 of 11 in sequence, and the coolant passes through the heat exchange part of the electronic device 15, the second three-way valve 102, the second path of the evaporator 114, the first pump 131, the heat exchange part of the energy storage battery 12, the heater 132, the first three-way valve 101, the second path of the condenser 112 and the second pump 161. The compressor 111, the first radiator 14 and the second radiator 162 do not work, the first pump 131 and the second pump 161 work, and the heater 132 can control the switch according to the actual situation of the energy storage battery 12.

[0100] The energy storage system 10 provided in the embodiment of the present application adds a valve port to each of the first valve 211 and the second valve 212 on the basis of the original four valve ports of the first valve 211 and the four valve ports of the second valve 212. By controlling the opening and closing of the valve ports of the first valve 211, the second valve 212, the first three-way valve 101 and the second three-way valve 102, the passage where the first radiator 14 and the second radiator 162 are located is shielded, so that the coolant cleverly bypasses the first radiator 14 and the second radiator 162 on the premise of passing through the electronic device 15, thereby realizing the waste heat utilization mode. In a low temperature environment, the waste heat of the electronic device 15 is used to heat the energy storage battery 12 to minimize the waste heat loss. At the same time, if the waste heat of the electronic device 15 is not enough to meet the heat demand of the energy storage battery 12, the heater 132 can also be turned on, and the waste heat combined with the heat of the heater 132 jointly heats the energy storage battery 12, thereby optimizing the heating effect of the waste heat utilization mode without affecting the energy density of the energy storage system 10.

[0101] In some embodiments, Figure 8-Figure 14 As shown, the valve group 21 can have first to tenth valve ports, wherein the first valve port C1 can be connected to the outlet of the first radiator 14, the second valve port C2 can be connected to the inlet of the first radiator 14, the third valve port C3 can be connected to the outlet of the second flow path 16, the fourth valve port C4 can be connected to the outlet of the first flow path 13, the fifth valve port C5 can be connected to the inlet of the second flow path 16, the sixth valve port C6 can be connected to the inlet of the first flow path 13, the seventh valve port C7 can be connected to the outlet of the second path of the condenser 112, the eighth valve port C8 can be connected to the outlet of the second path of the evaporator 114, the ninth valve port C9 can be connected to the inlet of the second path of the condenser 112, and the tenth valve port C10 can be connected to the inlet of the second path of the evaporator 114.

[0102] In this embodiment, if Figure 8-Figure 14 As shown, the valve group 21 is a ten-way valve, and the ten valve ports can respectively connect the inlet and outlet of the first radiator 14, the inlet and outlet of the second path of the condenser 112, the inlet and outlet of the second path of the evaporator 114, the inlet and outlet of the first flow path 13, and the inlet and outlet of the second flow path 16. By changing the connectivity between the ten valve ports of the valve group 21, the relationship between the first radiator 14, the second path of the condenser 112, the second path of the evaporator 114, the first flow path 13, and the second flow path 16 can be changed to realize active refrigeration mode, natural cooling mode, electric heating mode, active temperature equalization mode, liquid replenishment and exhaust mode, and heat pump heating mode.

[0103] The energy storage system 10 provided in the embodiment of the present application utilizes a structural design in which the first valve port to the tenth valve port are integrated into one valve, thereby further improving the integration of water-side components, so that the water-side pipelines are all concentratedly arranged at the ten-way valve, and the space occupied by the liquid cooling unit is reduced as much as possible, thereby significantly improving the energy density of the entire energy storage system 10, and realizing overall miniaturization and lightweight design. At the same time, by controlling the on-off state of the ten valve ports, active cooling mode, natural cooling mode, electric heating mode, active temperature equalization mode, liquid replenishment and exhaust mode, and heat pump heating mode are realized, thereby increasing the use width of the energy storage system 10.

[0104] In some embodiments, the valve group 21 may include: a third valve 213 and a fourth valve 214 .

[0105] like Figure 15-Figure 21 As shown, the first valve port D1 of the third valve 213 can be connected to the outlet of the first radiator 14, the second valve port D2 of the third valve 213 can be connected to the inlet of the first radiator 14, the third valve port D3 of the third valve 213 can be connected to the outlet of the second flow path 16, the fourth valve port D4 of the third valve 213 can be connected to the outlet of the first flow path 13, the fifth valve port D5 of the third valve 213 can be connected to the inlet of the second path of the condenser 112, and the sixth valve port D6 of the third valve 213 can be connected to the inlet of the second path of the evaporator 114; the first valve port E1 of the fourth valve 214 can be connected to the inlet of the second flow path 16, the second valve port E2 of the fourth valve 214 can be connected to the outlet of the second path of the condenser 112, the third valve port E3 of the fourth valve 214 can be connected to the inlet of the first flow path 13, and the fourth valve port E4 of the fourth valve 214 can be connected to the outlet of the second path of the evaporator 114.

[0106] In this embodiment, if Figure 15-Figure 21 As shown, the third valve 213 can have six valve ports, and the second valve 212 can have four valve ports. The six valve ports of the third valve 213 and the four valve ports of the fourth valve 214 can be respectively connected to the inlet and outlet of the first radiator 14, the inlet and outlet of the second path of the condenser 112, the inlet and outlet of the second path of the evaporator 114, the inlet and outlet of the first flow path 13, and the inlet and outlet of the second flow path 16. By changing the connectivity between the six valve ports of the third valve 213 and the four valve ports of the fourth valve 214, the relationship between the first radiator 14, the second path of the condenser 112, the second path of the evaporator 114, the first flow path 13, and the second flow path 16 can be changed to realize active cooling mode, natural cooling mode, electric heating mode, active temperature equalization mode, liquid replenishment and exhaust mode, and heat pump heating mode.

[0107] In other embodiments, the third valve 213 may have five valve ports, the second valve 212 may have five valve ports, and the five valve ports of the third valve 213 and the five valve ports of the fourth valve 214 may be respectively connected to the inlet and outlet of the first radiator 14, the inlet and outlet of the second path of the condenser 112, the inlet and outlet of the second path of the evaporator 114, the inlet and outlet of the first flow path 13, and the inlet and outlet of the second flow path 16.

[0108] In some other embodiments, the third valve 213 may have three valve ports, and the second valve 212 may have seven valve ports. The three valve ports of the third valve 213 and the seven valve ports of the fourth valve 214 may be respectively connected to the inlet and outlet of the first radiator 14, the inlet and outlet of the second path of the condenser 112, the inlet and outlet of the second path of the evaporator 114, the inlet and outlet of the first flow path 13, and the inlet and outlet of the second flow path 16.

[0109] The energy storage system 10 provided in the embodiment of the present application, through the arrangement of the third valve 213 and the fourth valve 214, 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 thermal management system, while reducing the complexity of pipe layout, shortening the working hours required for assembling the valve group 21, and facilitating mass production. At the same time, by controlling the on-off state of each valve port of the third valve 213 and the fourth valve 214, an active cooling mode, a natural cooling mode, an electric heating mode, an active temperature equalization mode, a liquid replenishment and exhaust mode, and a heat pump heating mode are realized, thereby increasing the use width of the energy storage system 10.

[0110] In some embodiments, the valve group 21 may include a fifth valve 215 , a sixth valve 216 , and a seventh valve 217 .

[0111] like Figure 22-Figure 28 As shown, the first valve port F1 of the fifth valve 215 can be connected to the outlet of the first radiator 14, the second valve port F2 of the fifth valve 215 can be connected to the inlet of the second path of the condenser 112, the third valve port F3 of the fifth valve 215 can be connected to the fourth valve port H4 of the seventh valve 217, and the fourth valve port F4 of the fifth valve 215 can be connected to the inlet of the second path of the evaporator 114; the first valve port G1 of the sixth valve 216 can be connected to the inlet of the second flow path 16, and the second valve port G2 of the sixth valve 216 can be connected to the inlet of the second flow path 16. Port G2 can be connected to the outlet of the second path of the condenser 112, the third valve port G3 of the sixth valve 216 can be connected to the inlet of the first flow path 13, and the fourth valve port G4 of the sixth valve 216 can be connected to the outlet of the second path of the evaporator 114; the first valve port H1 of the seventh valve 217 can be connected to the outlet of the second flow path 16, the second valve port H2 of the seventh valve 217 can be connected to the inlet of the first radiator 14, and the third valve port H3 of the seventh valve 217 can be connected to the outlet of the first flow path 13.

[0112] In this embodiment, if Figure 22-Figure 28 As shown, the fifth valve 215 can have four valve ports, the sixth valve 216 can have four valve ports, and the seventh valve 217 can have four valve ports, wherein one valve port of the fifth valve 215 can be connected to one valve port of the seventh valve 217, and the other three valve ports of the fifth valve 215, the four valve ports of the sixth valve 216, and the other three valve ports of the seventh valve 217 can be respectively connected to the inlet and outlet of the first radiator 14, the inlet and outlet of the second path of the condenser 112, the inlet and outlet of the second path of the evaporator 114, the inlet and outlet of the first flow path 13, and the inlet and outlet of the second flow path 16. By changing the connection relationship between the four valve ports of the fifth valve 215, the four valve ports of the sixth valve 216, and the four valve ports of the seventh valve 217, the relationship between the first radiator 14, the second path of the condenser 112, the second path of the evaporator 114, the first flow path 13, and the second flow path 16 can be changed to realize active cooling mode, natural cooling mode, electric heating mode, active temperature equalization mode, liquid replenishment and exhaust mode, and heat pump heating mode.

[0113] The energy storage system 10 provided in the embodiment of the present application, through the arrangement of the fifth valve 215, the sixth valve 216 and the seventh valve 217, utilizes the split design of the three valves, so that after the assembly is completed, the pipelines do not need to be stacked in the same position, which is convenient for the relevant operators to identify the pipelines during maintenance and inspection, further improving the maintainability of the entire energy storage thermal management system, while maximally reducing the complexity of the pipe layout, shortening the working hours required for the assembly of the valve group 21, and facilitating mass production. At the same time, by controlling the on-off state of each valve port of the fifth valve 215, the sixth valve 216 and the seventh valve 217, the active cooling mode, the natural cooling mode, the electric heating mode, the active temperature equalization mode, the liquid replenishment and exhaust mode and the heat pump heating mode are realized, thereby broadening the scope of use of the energy storage system 10.

[0114] In some embodiments, Figure 2 , Fig. 9 , Fig.16 and Fig.23 As shown, the energy storage system 10 has a first working mode. In the first working mode, the compressor 111, the first pump 131, the first radiator 14, the second pump 161 and the second radiator 162 are all working, the heater 132 is stopped, the first radiator 14, the second path of the condenser 112 and the second flow path 16 are connected end to end in sequence; the second path of the evaporator 114 and the first flow path 13 are connected end to end.

[0115] It should be noted that the first working mode is the above-mentioned active cooling mode.

[0116] like Figure 2As shown, in the case where the energy storage system 10 includes the first valve 211 and the second valve 212, when the energy storage system 10 is switched to the first working mode, the on-off state of each valve port of the first valve 211 and the second valve 212 is: the first valve port A1 of the first valve 211 is connected to the second valve port A2 of the first valve 211, and the third valve port A3 of the first valve 211 is connected to the fourth valve port A4 of the first valve 211; the first valve port B1 of the second valve 212 is connected to the fourth valve port B4 of the second valve 212, and the second valve port B2 of the second valve 212 is connected to the third valve port B3 of the second valve 212.

[0117] like Fig. 9 As shown, in the case where the valve group 21 has the first to tenth valve ports, when the energy storage system 10 is switched to the first working mode, the on-off states of the valve ports of the valve group 21 are: the first valve port C1 of the valve group 21 is connected to the ninth valve port C9 of the valve group 21, the second valve port C2 of the valve group 21 is connected to the third valve port C3 of the valve group 21, the fourth valve port C4 of the valve group 21 is connected to the tenth valve port C10 of the valve group 21, the fifth valve port C5 of the valve group 21 is connected to the seventh valve port C7 of the valve group 21, and the sixth valve port C6 of the valve group 21 is connected to the eighth valve port C8 of the valve group 21.

[0118] like Fig.16 As shown, in the case where the energy storage system 10 includes the third valve 213 and the fourth valve 214, when the energy storage system 10 is switched to the first working mode, the on-off states of the valve ports of the third valve 213 and the fourth valve 214 are as follows: the first valve port D1 of the third valve 213 is connected to the fifth valve port D5 of the third valve 213, the second valve port D2 of the third valve 213 is connected to the third valve port D3 of the third valve 213, and the fourth valve port D4 of the third valve 213 is connected to the sixth valve port D6 of the third valve 213; the first valve port E1 of the fourth valve 214 is connected to the second valve port E2 of the fourth valve 214, and the third valve port E3 of the fourth valve 214 is connected to the fourth valve port E4 of the fourth valve 214.

[0119] like Fig.23 As shown, in the case where the energy storage system 10 includes the fifth valve 215, the sixth valve 216 and the seventh valve 217, when the energy storage system 10 is switched to the first working mode, the on-off states of the valve ports of the fifth valve 215, the sixth valve 216 and the seventh valve 217 are as follows: the first valve port F1 of the fifth valve 215 is connected to the second valve port F2 of the fifth valve 215, and the third valve port F3 of the fifth valve 215 is connected to the fourth valve port F4 of the fifth valve 215; the first valve port G1 of the sixth valve 216 is connected to the second valve port G2 of the sixth valve 216, and the third valve port G3 of the sixth valve 216 is connected to the fourth valve port G4 of the sixth valve 216; the first valve port H1 of the seventh valve 217 is connected to the second valve port H2 of the seventh valve 217, and the third valve port H3 of the seventh valve 217 is connected to the fourth valve port H4 of the seventh valve 217.

[0120] The energy storage system 10 provided in the embodiment of the present application, through the design of the above-mentioned first 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 first radiator 14 and the second radiator 162 are used to dissipate heat for the electronic device 15 and the condenser 112, taking into account the heat dissipation requirements of the energy storage battery 12, the electronic device 15 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.

[0121] In some embodiments, Figure 3 , Fig.10 , Fig.17 and Fig.24 As shown, the energy storage system 10 has a second working mode. In the second working mode, the first pump 131, the first radiator 14, the second pump 161 and the second radiator 162 are all working, the compressor 111 and the heater 132 are stopped, the second path of the condenser 112 and the second flow path 16 are connected end to end, and the second path of the evaporator 114, the first flow path 13 and the first radiator 14 are connected end to end in sequence.

[0122] It should be noted that the second working mode is the above-mentioned natural cooling mode.

[0123] like Figure 3 As shown, in the case where the energy storage system 10 includes the first valve 211 and the second valve 212, when the energy storage system 10 is switched to the second working mode, the on-off states of the valve ports of the first valve 211 and the second valve 212 are: the first valve port A1 of the first valve 211 is connected to the fourth valve port A4 of the first valve 211, and the second valve port A2 of the first valve 211 is connected to the third valve port A3 of the first valve 211; the first valve port B1 of the second valve 212 is connected to the second valve port B2 of the second valve 212, and the third valve port B3 of the second valve 212 is connected to the fourth valve port B4 of the second valve 212.

[0124] like Fig.10 As shown, in the case where the valve group 21 has the first to tenth valve ports, when the energy storage system 10 switches to the second working mode, the on-off states of the valve ports of the valve group 21 are: the first valve port C1 of the valve group 21 is connected to the tenth valve port C10 of the valve group 21, the second valve port C2 of the valve group 21 is connected to the fourth valve port C4 of the valve group 21, the third valve port C3 of the valve group 21 is connected to the ninth valve port C9 of the valve group 21, the fifth valve port C5 of the valve group 21 is connected to the seventh valve port C7 of the valve group 21, and the sixth valve port C6 of the valve group 21 is connected to the eighth valve port C8 of the valve group 21.

[0125] like Fig.17As shown, in the case where the energy storage system 10 includes the third valve 213 and the fourth valve 214, when the energy storage system 10 is switched to the second working mode, the on-off states of the valve ports of the third valve 213 and the fourth valve 214 are as follows: the first valve port D1 of the third valve 213 is connected to the sixth valve port D6 of the third valve 213, the second valve port D2 of the third valve 213 is connected to the fourth valve port D4 of the third valve 213, and the third valve port D3 of the third valve 213 is connected to the fifth valve port D5 of the third valve 213; the first valve port E1 of the fourth valve 214 is connected to the second valve port E2 of the fourth valve 214, and the third valve port E3 of the fourth valve 214 is connected to the fourth valve port E4 of the fourth valve 214.

[0126] like Fig.24 As shown, in the case where the energy storage system 10 includes the fifth valve 215, the sixth valve 216 and the seventh valve 217, when the energy storage system 10 is switched to the second working mode, the on-off states of the valve ports of the fifth valve 215, the sixth valve 216 and the seventh valve 217 are as follows: the first valve port F1 of the fifth valve 215 is connected to the fourth valve port F4 of the fifth valve 215, and the second valve port F2 of the fifth valve 215 is connected to the third valve port F3 of the fifth valve 215; the first valve port G1 of the sixth valve 216 is connected to the second valve port G2 of the sixth valve 216, and the third valve port G3 of the sixth valve 216 is connected to the fourth valve port G4 of the sixth valve 216; the first valve port H1 of the seventh valve 217 is connected to the fourth valve port H4 of the seventh valve 217, and the second valve port H2 of the seventh valve 217 is connected to the third valve port H3 of the seventh valve 217.

[0127] 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 high, the first radiator 14 is used to perform air cooling on the energy storage battery 12, thereby meeting the basic heat dissipation requirements of the energy storage battery 12, and preventing the refrigeration system from being started as soon as the energy storage battery 12 is slightly heated, 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, and using the second radiator 162 to perform air cooling on the electronic device 15, thereby realizing independent heat dissipation of the energy storage battery 12 and the electronic device 15 in the second working mode, thereby reducing the heat exchange capacity requirements of the first radiator 14 and the second radiator 162, reducing the overall energy consumption of the system, and thus effectively reducing the manufacturing cost and maintenance cost.

[0128] In some embodiments, Figure 4 , Fig.11 , Fig.18 and Fig.25As shown, the energy storage system 10 has a third working mode. In the third working mode, the first pump 131 and the heater 132 are working, the compressor 111, the first radiator 14, the second pump 161 and the second radiator 162 are all stopped, and the second path of the evaporator 114 and the first flow path 13 are connected end to end.

[0129] It should be noted that the third working mode is the above-mentioned electric heating mode.

[0130] like Figure 4 As shown, in the case where the energy storage system 10 includes the first valve 211 and the second valve 212, when the energy storage system 10 is switched to the third working mode, the on-off state of each valve port of the first valve 211 and the second valve 212 is: the first valve port A1 of the first valve 211 is connected to the second valve port A2 of the first valve 211, and the third valve port A3 of the first valve 211 is connected to the fourth valve port A4 of the first valve 211.

[0131] like Fig.11 As shown, in the case where the valve group 21 has the first to tenth valve ports, when the energy storage system 10 switches to the third working mode, the on-off states of the valve ports of the valve group 21 are: the fourth valve port C4 of the valve group 21 is connected to the tenth valve port C10 of the valve group 21, and the sixth valve port C6 of the valve group 21 is connected to the eighth valve port C8 of the valve group 21.

[0132] like Fig.18 As shown, in the case where the energy storage system 10 includes the third valve 213 and the fourth valve 214, when the energy storage system 10 is switched to the third working mode, the on-off states of the valve ports of the third valve 213 and the fourth valve 214 are: the fourth valve port D4 of the third valve 213 is connected to the sixth valve port D6 of the third valve 213; the first valve port E1 of the fourth valve 214 is connected to the second valve port E2 of the fourth valve 214, and the third valve port E3 of the fourth valve 214 is connected to the fourth valve port E4 of the fourth valve 214.

[0133] like Fig.25 As shown, in the case where the energy storage system 10 includes the fifth valve 215, the sixth valve 216 and the seventh valve 217, when the energy storage system 10 is switched to the third working mode, the on-off states of the valve ports of the fifth valve 215, the sixth valve 216 and the seventh valve 217 are as follows: the third valve port F3 of the fifth valve 215 is connected to the fourth valve port F4 of the fifth valve 215; the third valve port G3 of the sixth valve 216 is connected to the fourth valve port G4 of the sixth valve 216; the third valve port H3 of the seventh valve 217 is connected to the fourth valve port H4 of the seventh valve 217.

[0134] 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 low, the heater 132 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.

[0135] In some embodiments, Figure 1-Figure 29 As shown, the energy storage system 10 further includes a water tank 17. The air inlet of the water tank 17 can be selectively connected to the first flow path 13, and at least one of the first flow path 13 and the second flow path 16 is provided with a liquid replenishing port.

[0136] like Figure 5 , Fig.12 , Fig.19 and Fig.26 As shown, the energy storage system 10 has a fourth working mode. In the fourth working mode, the first pump 131 and the second pump 161 are working, the compressor 111, the first radiator 14, the second radiator 162 and the heater 132 are all stopped, the second path of the evaporator 114, the first flow path 13, the first radiator 14, the second path of the condenser 112 and the second flow path 16 are connected end to end in sequence, and the air inlet of the water tank 17 is connected to the first flow path 13.

[0137] It should be noted that the fourth working mode is the above-mentioned liquid replenishment and exhaust mode.

[0138] In this embodiment, if Figure 1-Figure 29 As shown, the filling port and the exhaust port of the energy storage system 10 can be arranged on the first flow path 13. Specifically, the water tank 17 is connected to the exhaust port on the first flow path 13 through the dotted line in the figure, and the exhaust port is located between the inlet of the heater 132 and the outlet of the heat exchange part of the energy storage battery 12; the filling port is arranged close to the outlet of the heat exchange part of the energy storage battery 12, for example, the filling port can be located between the exhaust port and the outlet of the heat exchange part of the energy storage battery 12. In the fourth working mode, the added coolant can enter the first flow path 13 from the filling port, and then circulate between the second path of the evaporator 114, the first flow path 13, the first radiator 14, the second path of the condenser 112, and the second flow path 16. With the flow of the added coolant, the excess gas in the water side pipeline can also be discharged into the water tank 17 through the exhaust port, and finally discharged from the air outlet of the water tank 17.

[0139] like Figure 5As shown, in the case where the energy storage system 10 includes the first valve 211 and the second valve 212, when the energy storage system 10 is switched to the fourth working mode, the on-off states of the valve ports of the first valve 211 and the second valve 212 are: the first valve port A1 of the first valve 211 is connected to the fourth valve port A4 of the first valve 211, and the second valve port A2 of the first valve 211 is connected to the third valve port A3 of the first valve 211; the first valve port B1 of the second valve 212 is connected to the fourth valve port B4 of the second valve 212, and the second valve port B2 of the second valve 212 is connected to the third valve port B3 of the second valve 212.

[0140] like Fig.12 As shown, in the case where the valve group 21 has the first to tenth valve ports, when the energy storage system 10 switches to the fourth working mode, the on-off states of the valve ports of the valve group 21 are: the first valve port C1 of the valve group 21 is connected to the ninth valve port C9 of the valve group 21, the second valve port C2 of the valve group 21 is connected to the fourth valve port C4 of the valve group 21, the third valve port C3 of the valve group 21 is connected to the tenth valve port C10 of the valve group 21, the fifth valve port C5 of the valve group 21 is connected to the seventh valve port C7 of the valve group 21, and the sixth valve port C6 of the valve group 21 is connected to the eighth valve port C8 of the valve group 21.

[0141] like Fig.19 As shown, in the case where the energy storage system 10 includes the third valve 213 and the fourth valve 214, when the energy storage system 10 is switched to the fourth working mode, the on-off states of the valve ports of the third valve 213 and the fourth valve 214 are as follows: the first valve port D1 of the third valve 213 is connected to the fifth valve port D5 of the third valve 213, the second valve port D2 of the third valve 213 is connected to the fourth valve port D4 of the third valve 213, and the third valve port D3 of the third valve 213 is connected to the sixth valve port D6 of the third valve 213; the first valve port E1 of the fourth valve 214 is connected to the second valve port E2 of the fourth valve 214, and the third valve port E3 of the fourth valve 214 is connected to the fourth valve port E4 of the fourth valve 214.

[0142] like Fig.26 As shown, in the case where the energy storage system 10 includes the fifth valve 215, the sixth valve 216 and the seventh valve 217, when the energy storage system 10 is switched to the fourth working mode, the on-off states of the valve ports of the fifth valve 215, the sixth valve 216 and the seventh valve 217 are as follows: the first valve port F1 of the fifth valve 215 is connected to the second valve port F2 of the fifth valve 215, and the third valve port F3 of the fifth valve 215 is connected to the fourth valve port F4 of the fifth valve 215; the first valve port G1 of the sixth valve 216 is connected to the second valve port G2 of the sixth valve 216, and the third valve port G3 of the sixth valve 216 is connected to the fourth valve port G4 of the sixth valve 216; the first valve port H1 of the seventh valve 217 is connected to the fourth valve port H4 of the seventh valve 217, and the second valve port H2 of the seventh valve 217 is connected to the third valve port H3 of the seventh valve 217.

[0143] The energy storage system 10 provided in the embodiment of the present application realizes the replenishment of coolant in the water side flow path and the timely discharge of exhaust gas through the design of the above-mentioned fourth working mode, so that the cooling water in the thermal management system is always maintained at an appropriate level, reducing the probability of system overheating or other operating problems caused by insufficient cooling water, thereby effectively transferring heat from the energy storage battery 12 and the electronic device 15 to the first radiator 14 and the second radiator 162. At the same time, exhausting air to the outside can eliminate air bubbles in the water side flow path, prevent the increase of thermal resistance due to the blockage of the pipeline by bubbles, and thus improve the overall cooling efficiency of the system. In addition, timely replenishment of coolant and exhaust can reduce corrosion and sediment in the system, keep the pipeline clean, and further extend the working life of the energy storage system 10.

[0144] In some embodiments, Figure 6 , Fig.13 , Fig. 20 and Fig. 27 As shown, the energy storage system 10 has a fifth working mode. In the fifth working mode, the first pump 131 is working, the compressor 111, the first radiator 14, the second pump 161, the second radiator 162 and the heater 132 are all stopped, and the second path of the evaporator 114 and the first flow path 13 are connected end to end.

[0145] It should be noted that the fifth working mode is the above-mentioned active temperature equalization mode.

[0146] like Figure 6 As shown, in the case where the energy storage system 10 includes the first valve 211 and the second valve 212, when the energy storage system 10 is switched to the fifth working mode, the on-off state of each valve port of the first valve 211 and the second valve 212 is: the first valve port A1 of the first valve 211 is connected to the second valve port A2 of the first valve 211, and the third valve port A3 of the first valve 211 is connected to the fourth valve port A4 of the first valve 211.

[0147] like Fig.13 As shown, in the case where the valve group 21 has the first to tenth valve ports, when the energy storage system 10 switches to the fifth working mode, the on-off states of the valve ports of the valve group 21 are: the fourth valve port C4 of the valve group 21 is connected to the tenth valve port C10 of the valve group 21, and the sixth valve port C6 of the valve group 21 is connected to the eighth valve port C8 of the valve group 21.

[0148] like Fig. 20As shown, in the case where the energy storage system 10 includes the third valve 213 and the fourth valve 214, when the energy storage system 10 is switched to the fifth working mode, the on-off states of the valve ports of the third valve 213 and the fourth valve 214 are as follows: the fourth valve port D4 of the third valve 213 is connected to the sixth valve port D6 of the third valve 213; the first valve port E1 of the fourth valve 214 is connected to the second valve port E2 of the fourth valve 214, and the third valve port E3 of the fourth valve 214 is connected to the fourth valve port E4 of the fourth valve 214.

[0149] like Fig. 27 As shown, in the case where the energy storage system 10 includes the fifth valve 215, the sixth valve 216 and the seventh valve 217, when the energy storage system 10 is switched to the fifth working mode, the on-off states of the valve ports of the fifth valve 215, the sixth valve 216 and the seventh valve 217 are as follows: the third valve port F3 of the fifth valve 215 is connected to the fourth valve port F4 of the fifth valve 215; the third valve port G3 of the sixth valve 216 is connected to the fourth valve port G4 of the sixth valve 216; the third valve port H3 of the seventh valve 217 is connected to the fourth valve port H4 of the seventh valve 217.

[0150] The energy storage system 10 provided in the embodiment of the present application, through the design of the fifth 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.

[0151] In some embodiments, Fig.14 , Fig.21 and Fig.28 As shown, the energy storage system 10 has a sixth working mode. In the sixth working mode, the compressor 111, the first pump 131, the first radiator 14, the second pump 161 and the second radiator 162 are all working, the second path of the condenser 112 and the first flow path 13 are connected end to end, and the second path of the evaporator 114, the second flow path 16 and the first radiator 14 are connected end to end in sequence.

[0152] It should be noted that the sixth working mode is the above-mentioned heat pump heating mode. In the heat pump heating mode, the switch of the heater 132 can be controlled according to the actual condition of the energy storage battery 12.

[0153] like Fig.14As shown, in the case where the valve group 21 has the first to tenth valve ports, when the energy storage system 10 switches to the sixth working mode, the on-off states of the valve ports of the valve group 21 are: the first valve port C1 of the valve group 21 is connected to the tenth valve port C10 of the valve group 21, the second valve port C2 of the valve group 21 is connected to the third valve port C3 of the valve group 21, the fourth valve port C4 of the valve group 21 is connected to the ninth valve port C9 of the valve group 21, the fifth valve port C5 of the valve group 21 is connected to the eighth valve port C8 of the valve group 21, and the sixth valve port C6 of the valve group 21 is connected to the seventh valve port C7 of the valve group 21.

[0154] like Fig.21 As shown, in the case where the energy storage system 10 includes the third valve 213 and the fourth valve 214, when the energy storage system 10 is switched to the sixth working mode, the on-off states of the valve ports of the third valve 213 and the fourth valve 214 are as follows: the first valve port D1 of the third valve 213 is connected to the sixth valve port D6 of the third valve 213, the second valve port D2 of the third valve 213 is connected to the third valve port D3 of the third valve 213, and the fourth valve port D4 of the third valve 213 is connected to the fifth valve port D5 of the third valve 213; the first valve port E1 of the fourth valve 214 is connected to the fourth valve port E4 of the fourth valve 214, and the second valve port E2 of the fourth valve 214 is connected to the third valve port E3 of the fourth valve 214.

[0155] like Fig.28 As shown, in the case where the energy storage system 10 includes the fifth valve 215, the sixth valve 216 and the seventh valve 217, when the energy storage system 10 is switched to the sixth working mode, the on-off states of the valve ports of the fifth valve 215, the sixth valve 216 and the seventh valve 217 are as follows: the first valve port F1 of the fifth valve 215 is connected to the fourth valve port F4 of the fifth valve 215, and the second valve port F2 of the fifth valve 215 is connected to the third valve port F3 of the fifth valve 215; the first valve port G1 of the sixth valve 216 is connected to the fourth valve port G4 of the sixth valve 216, and the second valve port G2 of the sixth valve 216 is connected to the third valve port G3 of the sixth valve 216; the first valve port H1 of the seventh valve 217 is connected to the second valve port H2 of the seventh valve 217, and the third valve port H3 of the seventh valve 217 is connected to the fourth valve port H4 of the seventh valve 217.

[0156] 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, 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, and the performance of the energy storage system 10 is optimized. At the same time, the waste heat of the electronic device 15 is used to supplement the heat of the low-pressure end of the refrigerant cycle, so as to achieve the effect of combined heating of the electronic device 15 and the compressor 111. If the waste heat of the electronic device 15 and the heating capacity of the compressor 111 are not enough to meet the heat demand of the energy storage battery 12, the heater 132 can be turned on to provide heat by heating, the waste heat of the electronic device 15 and the heating of the compressor 111, so as to achieve excess thermal power output, further improve the heating power, and accelerate the temperature rise rate of the energy storage battery 12 in an extremely cold environment.

[0157] In some embodiments, the refrigeration circuit 11 may further include a dehumidification branch.

[0158] like Figure 1-Figure 29 As shown, the dehumidification branch can be connected in parallel to the series path formed by the first path of the evaporator 114 and the first expansion valve 113, and the dehumidification branch can include a dehumidification heat exchanger 116 and a second expansion valve 117.

[0159] The following describes the embodiments of the present application in detail from two different implementation perspectives.

[0160] 1. Only the dehumidification heat exchanger 116 works, and the evaporator 114 does not work.

[0161] In actual implementation, when the energy storage system 10 needs to start the dehumidification function, the compressor 111 starts working, the first expansion valve 113 is closed, and the second expansion valve 117 is opened. After the low-temperature refrigerant flows out from the outlet of the first path of the condenser 112, it flows into the dehumidification branch. At the same time, the second flow path 16, the second path of the condenser 112 and the first radiator 14 can be connected end to end in sequence. The first radiator 14 and the second radiator 162 can dissipate heat for the electronic device 15 and the condenser 112. In the process of the low-temperature refrigerant flowing through the dehumidification heat exchanger 116, the water vapor in the air condenses into water and adheres to the surface of the dehumidification heat exchanger 116. Finally, the condensed water is collected to complete the dehumidification process.

[0162] 2. Both the dehumidification heat exchanger 116 and the evaporator 114 are working.

[0163] In actual implementation, when the energy storage system 10 needs to start the dehumidification function, the compressor 111 starts working, the first expansion valve 113 and the second expansion valve 117 are both opened, and after the low-temperature refrigerant flows out from the outlet of the first path of the condenser 112, a part of it flows into the dehumidification branch, and the other part flows into the first path of the evaporator 114. In other words, in this case, the refrigeration circuit 11 extracts part of the refrigerant for dehumidification, and the other refrigerant is still used for heat exchange with the water side components. In the process of the low-temperature refrigerant flowing through the dehumidification heat exchanger 116, the water vapor in the air condenses into water and adheres to the surface of the dehumidification heat exchanger 116, and finally the condensed water is collected to complete the dehumidification process.

[0164] It should be noted that when the energy storage system 10 does not need to start the dehumidification function, the second expansion valve 117 is in a normally closed state; when the energy storage system 10 needs to start the dehumidification function, when the dehumidification heat exchanger 116 and the evaporator 114 are both working, the on-off state of the multiple valve ports of the valve group 21 can refer to the on-off state of each valve port in the first working mode to the sixth working mode. The on-off state of each valve port in the first working mode to the sixth working mode has been detailed in the above and will not be repeated here.

[0165] The energy storage system 10 provided in the embodiment of the present application can realize the independent dehumidification function of the energy storage system 10 and maximize the dehumidification effect by setting the above-mentioned dehumidification heat exchanger 116 and the second expansion valve 117 to control the opening and closing of the first expansion valve 113 and the second expansion valve 117. It can also extract part of the refrigerant for synchronous dehumidification, taking into account the thermal management requirements of the energy storage battery 12 and the dehumidification requirements of the system, thereby increasing the practicality and usage range of the entire energy storage system 10.

[0166] In some embodiments, Fig.29 As shown, the energy storage system 10 may further include: a water receiving tank 18 and a spraying device 19 .

[0167] The water receiving tank 18 can be located below the dehumidification heat exchanger 116 along the gravity direction, and the water receiving tank 18 can be used to receive and accumulate condensed water; the spray device 19 can be connected to the water receiving tank 18, and the spray port of the spray device 19 is suitable for facing at least one of the first radiator 14 and the second radiator 162.

[0168] In this embodiment, if Fig.29As shown, the spray device 19 may include a nozzle 191, a delivery pipe 192 and a third pump 193. The inlet of the delivery pipe 192 is connected to the water receiving tank 18, and the outlet of the delivery pipe 192 is connected to the nozzle 191. The third pump 193 is used to drive the condensed water in the delivery pipe 192 to flow. The spray port of the nozzle 191 can be directed toward the first radiator 14. The condensed water accumulated in the water receiving tank 18 can be sprayed onto the surface of the first radiator 14 through the spray device 19, and the heat dissipation rate of the first radiator 14 is improved by utilizing the rapid evaporation and heat absorption of the condensed water.

[0169] In other embodiments, the nozzle 191 may have multiple spray outlets, and the multiple spray outlets may be respectively directed toward the first radiator 14 and the second radiator 162; or the spray device 19 may include multiple nozzles 191, and the spray outlets of the multiple nozzles 191 may be respectively directed toward the first radiator 14 and the second radiator 162. The condensed water accumulated in the water tank 18 may be sprayed onto the surfaces of the first radiator 14 and the second radiator 162 through the spray device 19, and the heat dissipation rate of the first radiator 14 and the second radiator 162 may be improved by utilizing the rapid evaporation and heat absorption of the condensed water.

[0170] In some other embodiments, the spray port of the nozzle 191 can be directed toward the second radiator 162, and the condensed water accumulated in the water tank 18 can be sprayed onto the surface of the second radiator 162 through the spray device 19, so as to improve the heat dissipation rate of the second radiator 162 by utilizing the rapid evaporation and heat absorption of the condensed water.

[0171] 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 water receiving tank 18 and the spraying device 19. After the condensed water on the dehumidification heat exchanger 116 is collected, it is sprayed on the first radiator 14 and / or the second radiator 162, which can quickly reduce the temperature of the first radiator 14 and / or the second radiator 162, enhance the heat exchange capacity of the first radiator 14 and / or the second radiator 162, and improve the working performance of the refrigeration circuit 11, which not only reduces the energy consumption of the system, but also realizes the effective utilization of condensed water, and meets the environmental protection requirements of energy conservation and emission reduction. At the same time, the spraying device 19 can be equipped with an intelligent control system to automatically adjust the spraying water volume and spraying time according to the temperature of the first radiator 14 and / or the second radiator 162 and the operating status of the system, so as to realize intelligent and precise heat dissipation control.

[0172] The application also discloses a photovoltaic energy storage system.

[0173] In some embodiments, the photovoltaic energy storage system includes: a photovoltaic power generation system and any one of the energy storage systems 10 described above.

[0174] The photovoltaic power generation system is used to supply power to the energy storage system 10 .

[0175] 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.

[0176] The photovoltaic energy storage system provided in the embodiment of the present application, through the configuration of the above-mentioned energy storage system 10, uses corresponding radiators to perform separate heat dissipation for the energy storage batteries 12 and electronic devices 15 with different water inlet temperature requirements, thereby reducing the heat exchange capacity requirements of the first radiator 14 and the second radiator 162, reducing the overall energy consumption of the system, and thus effectively reducing the manufacturing cost and maintenance cost; at the same time, it can realize a variety of thermal management modes by switching the water circuit circulation, reduce the excessive use of the refrigeration circuit 11, and reduce the energy consumption of the product throughout its life cycle, thereby improving the comprehensive use performance, and thus improving the system operation energy efficiency; and improve the integration of water-side components, thereby reducing the volume of the liquid cooling unit, and thus improving the energy density of the energy storage system 10.

[0177] 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.

[0178] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "inside", "outside", etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying 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.

[0179] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0180] In the description of the present application, “plurality” means two or more.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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 comprising a compressor, a first circuit of a condenser, a first expansion valve and a first circuit of an evaporator; 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 and a heater; first radiator; 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 and a second radiator; A valve group, wherein the multiple valve ports of the valve group are respectively connected to the second path of the condenser, the second path of the evaporator, the first radiator, the first flow path and the second flow path, and the multiple valve ports of the valve group can be selectively opened and closed.

2. The energy storage system according to claim 1, characterized in that: The energy storage system has a first operating mode. In the first operating mode, the compressor, the first pump, the first radiator, the second pump and the second radiator are all working, the heater is stopped, the first radiator, the second path of the condenser and the second flow path are connected end to end in sequence; the second path of the evaporator and the first flow path are connected end to end.

3. The energy storage system according to claim 1, characterized in that: The energy storage system has a second operating mode. In the second operating mode, the first pump, the first radiator, the second pump and the second radiator are all working, the compressor and the heater are stopped, the second path of the condenser and the second flow path are connected end to end, and the second path of the evaporator, the first flow path and the first radiator are connected end to end in sequence.

4. The energy storage system according to claim 1, characterized in that: The energy storage system has a third working mode. In the third working mode, the first pump and the heater are working, the compressor, the first radiator, the second pump and the second radiator are all stopped, and the second path of the evaporator is connected end to end with the first flow path.

5. The energy storage system according to claim 1, characterized in that: Also includes: a water tank, wherein an air inlet of the water tank can be selectively communicated with the first flow path, and at least one of the first flow path and the second flow path is provided with a liquid replenishing port; The energy storage system has a fourth operating mode. In the fourth operating mode, the first pump and the second pump are working, the compressor, the first radiator, the second radiator and the heater are all stopped, the second path of the evaporator, the first flow path, the first radiator, the second path of the condenser and the second flow path are connected end to end in sequence, and the air inlet of the water tank is connected to the first flow path.

6. The energy storage system according to claim 1, characterized in that: The energy storage system has a fifth working mode. In the fifth working mode, the first pump is working, the compressor, the first radiator, the second pump, the second radiator and the heater are all stopped, and the second path of the evaporator is connected end to end with the first flow path.

7. The energy storage system according to claim 1, characterized in that: The energy storage system has a sixth operating mode. In the sixth operating mode, the compressor, the first pump, the first radiator, the second pump and the second radiator are all working, the second path of the condenser and the first flow path are connected end to end, and the second path of the evaporator, the second flow path and the first radiator 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 inlet of the first flow path is connected to the outlet of the second flow path of the evaporator, and the inlet of the second flow path is connected to the outlet of the second flow path of the condenser; the valve group includes: A first valve and a second valve, wherein the first valve port of the first valve is connected to the inlet of the first radiator, the second valve port of the first valve is connected to the fourth valve port of the second valve, the third valve port of the first valve is connected to the inlet of the second path of the evaporator, and the fourth valve port of the first valve is connected to the outlet of the first flow path; the first valve port of the second valve is connected to the outlet of the second flow path, the second valve port of the second valve is connected to the inlet of the second path of the condenser, and the third valve port of the second valve is connected to the outlet of the first radiator.

9. The energy storage system according to claim 8, characterized in that: Also includes: a first three-way valve, wherein three valve ports of the first three-way valve are respectively connected to the fifth valve port of the first valve, the third valve port of the second valve, and the outlet of the first radiator; A second three-way valve, wherein three valve ports of the second three-way valve are respectively connected to the inlet of the second radiator, the outlet of the heat exchange portion of the electronic device and the fifth valve port of the second valve.

10. The energy storage system according to any one of claims 1 to 7, characterized in that: The valve group has first to tenth valve ports, wherein the first valve port is connected to the outlet of the first radiator, the second valve port is connected to the inlet of the first radiator, the third valve port is connected to the outlet of the second flow path, the fourth valve port is connected to the outlet of the first flow path, the fifth valve port is connected to the inlet of the second flow path, the sixth valve port is connected to the inlet of the first flow path, the seventh valve port is connected to the outlet of the second path of the condenser, the eighth valve port is connected to the outlet of the second path of the evaporator, the ninth valve port is connected to the inlet of the second path of the condenser, and the tenth valve port is connected to the inlet of the second path of the evaporator.

11. The energy storage system according to any one of claims 1 to 7, characterized in that: The valve group comprises: a third valve, wherein a first valve port of the third valve is connected to the outlet of the first radiator, a second valve port of the third valve is connected to the inlet of the first radiator, a third valve port of the third valve is connected to the outlet of the second flow path, a fourth valve port of the third valve is connected to the outlet of the first flow path, a fifth valve port of the third valve is connected to the inlet of the second path of the condenser, and a sixth valve port of the third valve is connected to the inlet of the second path of the evaporator; A fourth valve, wherein a first valve port of the fourth valve is connected to the inlet of the second flow path, a second valve port of the fourth valve is connected to the outlet of the second path of the condenser, a third valve port of the fourth valve is connected to the inlet of the first flow path, and a fourth valve port of the fourth valve is connected to the outlet of the second path of the evaporator.

12. The energy storage system according to any one of claims 1 to 7, characterized in that: The valve group comprises: The fifth valve, the sixth valve and the seventh valve, the first valve port of the fifth valve is connected to the outlet of the first radiator, the second valve port of the fifth valve is connected to the inlet of the second path of the condenser, the third valve port of the fifth valve is connected to the fourth valve port of the seventh valve, and the fourth valve port of the fifth valve is connected to the inlet of the second path of the evaporator; the first valve port of the sixth valve is connected to the inlet of the second flow path, the second valve port of the sixth valve is connected to the outlet of the second path of the condenser, the third valve port of the sixth valve is connected to the inlet of the first flow path, and the fourth valve port of the sixth valve is connected to the outlet of the second path of the evaporator; the first valve port of the seventh valve is connected to the outlet of the second flow path, the second valve port of the seventh valve is connected to the inlet of the first radiator, and the third valve port of the seventh valve is connected to the outlet of the first flow path.

13. The energy storage system according to any one of claims 1 to 7, characterized in that: The refrigeration circuit also includes: A dehumidification branch is connected in parallel to a series passage formed by the first path of the evaporator and the first expansion valve, and the dehumidification branch includes a dehumidification heat exchanger and a second expansion valve.

14. The energy storage system according to claim 13, characterized in that: Also includes: A water receiving tank, the water receiving tank is located below the dehumidification heat exchanger along the gravity direction and is used to receive and accumulate condensed water; A spray device is connected to the water receiving tank, and a spray port of the spray device is suitable for facing at least one of the first radiator and the second radiator.

15. A photovoltaic energy storage system, characterized in that: include: The energy storage system as claimed in claim 14; A photovoltaic power generation system is used to supply power to the energy storage system.

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