Energy storage systems and photovoltaic energy storage systems

Abstract

The application discloses an energy storage system and a photovoltaic energy storage system, and belongs to the technical field of energy storage. In the energy storage system: a refrigeration circuit comprises a compressor, a first circuit of a condenser, a first expansion valve and a first circuit of an evaporator; a heat exchange part of an energy storage battery is communicated with the first circuit, the first circuit comprises a first pump and a heater; a first heat sink; a heat exchange part of an electronic device is communicated with a second circuit, the second circuit comprises a second pump and a second heat sink; a plurality of valve ports of a valve group are respectively connected with a second circuit of the condenser, a second circuit of the evaporator, the first heat sink, the first circuit and the second circuit, and the plurality of valve ports can be selectively turned on and turned off. The above structure is used for separately radiating the energy storage battery and the electronic device with different water inlet temperature requirements by using corresponding heat sinks, the heat exchange capacity requirement of the heat sink is reduced, and the manufacturing cost and the maintenance cost are reduced.

Description

TECHNICAL FIELD

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

[0002] With the rapid development of renewable energy technologies, especially the use of clean energy such as solar and wind energy, how to efficiently store and utilize these intermittent energy sources has become an increasingly prominent problem. Current energy storage systems mostly use electrochemical energy storage methods, but these systems often have defects such as low energy conversion efficiency, slow response speed, and poor environmental adaptability, especially in extreme weather conditions such as high temperature or low temperature, the efficiency and stability of the energy storage system will be severely affected.

[0003] In related technologies, the thermal management of the energy storage system mainly relies on a water chiller and a liquid cooling heat exchange device to cool or heat the energy storage battery. However, this thermal management method may not meet the growing scale and density of the energy storage system, often having problems such as insufficient cooling efficiency, long response time, high energy consumption, etc. In extremely cold or high-temperature environments, it is even more inadequate. Because the thermal management method is relatively single, it is difficult to achieve precise temperature control and heat balance, and it relies too much on the refrigeration system, resulting in high energy consumption of the entire system during the recycling process, thereby affecting the overall operating efficiency of the energy storage system. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides an energy storage system and a photovoltaic energy storage system, which reduces the heat exchange capacity requirement of the first heat sink and the second heat sink, reduces the overall energy consumption of the system, reduces the manufacturing cost and maintenance cost, realizes multiple thermal management modes, reduces the excessive use of the refrigeration circuit, improves the energy efficiency of the system, improves the integration of the water side components, and improves 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 path of a condenser, a first expansion valve, and a first path of an evaporator;

[0007] an energy storage battery and a first flow path, the heat exchange part of the energy storage battery being communicated with the first flow path, and the first flow path comprising a first pump and a heater;

[0008] a first heat sink;

[0009] an electronic device and a second flow path, the heat exchange part of the electronic device being communicated with the second flow path, and the second flow path comprising a second pump and a second heat sink;

[0010] A valve group, a plurality of valve ports of the valve group are 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 respectively, and the plurality of valve ports of the valve group can be selectively opened and closed.

[0011] According to the energy storage system of the present application, by arranging the first radiator, the second radiator and the valve group, the energy storage battery and the electronic device with different water inlet temperature requirements are respectively cooled by the corresponding radiator, thereby reducing the heat exchange capacity requirement of the first radiator and the second radiator, reducing the overall energy consumption of the system, and effectively reducing the manufacturing cost and maintenance cost; at the same time, multiple heat management modes can be realized by using water circuit circulation switching, reducing the overuse of the refrigeration circuit, reducing the energy consumption of the product life cycle, thereby improving the overall use performance, and improving the system operation energy efficiency; and improving the integration of the water side components, thereby reducing the volume of the liquid cooling unit, and thereby improving the energy density of the energy storage system.

[0012] According to an embodiment of the present application, the energy storage system has a first working mode, in which the compressor, the first pump, the first radiator, the second pump and the second radiator all work, the heater is stopped, and the first radiator, the second path of the condenser and the second flow path are connected in sequence; the second path of the evaporator and the first flow path are connected in sequence.

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

[0014] According to an embodiment of the present application, the energy storage system has a third working mode, in which the first pump and the heater work, the compressor, the first radiator, the second pump and the second radiator are all stopped, and the second path of the evaporator and the first flow path are connected in sequence.

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

[0016] A water tank, an air inlet of the water tank is 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 supplementing port;

[0017] The energy storage system has a fourth working mode, in which the first pump and the second pump work, the compressor, the first radiator, the second radiator and the heater are all shut down, 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 in sequence, and the air inlet of the water tank is communicated with the first flow path.

[0018] According to an embodiment of the present application, the energy storage system has a fifth working mode, in which the first pump works, the compressor, the first radiator, the second pump, the second radiator and the heater are all shut down, and the second path of the evaporator and the first flow path are connected in sequence.

[0019] According to an embodiment of the present application, the energy storage system has a sixth working mode, in which the compressor, the first pump, the first radiator, the second pump and the second radiator all work, the second path of the condenser and the first flow path are connected in sequence, and the second path of the evaporator, the second flow path and the first radiator are connected in sequence.

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

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

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

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

[0024] a second three-way valve, three valve ports of the second three-way valve are connected with the inlet of the second radiator, the outlet of the heat exchange part of the electronic device and the fifth valve port of the second valve respectively.

[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 an outlet of the first radiator, the second valve port is connected to an inlet of the first radiator, the third valve port is connected to an outlet of the second flow path, the fourth valve port is connected to an outlet of the first flow path, the fifth valve port is connected to an inlet of the second flow path, the sixth valve port is connected to an inlet of the first flow path, the seventh valve port is connected to an outlet of the second path of the condenser, the eighth valve port is connected to an outlet of the second path of the evaporator, the ninth valve port is connected to an inlet of the second path of the condenser, and the tenth valve port is connected to an inlet of the second path of the evaporator.

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

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

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

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

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

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

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

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

[0034] A water collecting groove is located below the dehumidification heat exchanger in the direction of gravity, and is used to collect and accumulate condensed water.

[0035] A spraying device is in communication with the water collecting groove, and a spraying port of the spraying device is adapted to face at least one of the first heat sink and the second heat sink.

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

[0037] The energy storage system as described 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, by the arrangement of the energy storage system as described above, the corresponding heat sinks are used to individually dissipate heat for the energy storage cells and electronic devices with different water inlet temperature requirements, so as to reduce the heat exchange capacity requirements of the first heat sink and the second heat sink, reduce the overall energy consumption of the system, and effectively reduce the manufacturing cost and maintenance cost; at the same time, multiple heat management modes can be realized by using the water circuit to switch, the overuse of the refrigeration circuit is reduced, the energy consumption of the product in the whole life cycle is reduced, the comprehensive use performance is improved, and the system operation energy efficiency is improved; and the integration of the water side components is improved, so as to reduce the volume of the liquid cooling unit, and improve the energy density of the energy storage system.

[0040] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter in the description of embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0041] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the description of embodiments, which follows, including the accompanying drawings.

[0042] Figure 1 is one of the structure schematic diagrams of the energy storage system provided by the embodiments of the present application;

[0043] Figure 2 is one of the structure schematic diagrams of the energy storage system in the first working mode provided by the embodiments of the present application;

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

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

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

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

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

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

[0050] Figure 9 is the second structural schematic diagram of the energy storage system in the first working mode provided by the embodiment of the present application;

[0051] Figure 10 is the second structural schematic diagram of the energy storage system in the second working mode provided by the embodiment of the present application;

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

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

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

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

[0056] Figure 15 is the fourth structural schematic diagram of the energy storage system provided by the embodiment of the present application;

[0057] Figure 16 is the third structural schematic diagram of the energy storage system in the first working mode provided by the embodiment of the present application;

[0058] Figure 17 is the third structural schematic diagram of the energy storage system in the second working mode provided by the embodiment of the present application;

[0059] Figure 18 Figure 3 is a structural schematic diagram of the energy storage system in the third working mode according to an embodiment of the present application;

[0060] Figure 19 Figure 4 is a structural schematic diagram of the energy storage system in the fourth working mode according to an embodiment of the present application;

[0061] Figure 20 Figure 5 is a structural schematic diagram of the energy storage system in the fifth working mode according to an embodiment of the present application;

[0062] Figure 21 Figure 6 is a structural schematic diagram of the energy storage system in the sixth working mode according to an embodiment of the present application;

[0063] Figure 22 Figure 7 is a structural schematic diagram of the energy storage system according to an embodiment of the present application;

[0064] Figure 23 Figure 8 is a structural schematic diagram of the energy storage system in the first working mode according to an embodiment of the present application;

[0065] Figure 24 Figure 9 is a structural schematic diagram of the energy storage system in the second working mode according to an embodiment of the present application;

[0066] Figure 25 Figure 10 is a structural schematic diagram of the energy storage system in the third working mode according to an embodiment of the present application;

[0067] Figure 26 Figure 11 is a structural schematic diagram of the energy storage system in the fourth working mode according to an embodiment of the present application;

[0068] Figure 27 Figure 12 is a structural schematic diagram of the energy storage system in the fifth working mode according to an embodiment of the present application;

[0069] Figure 28 Figure 13 is a structural schematic diagram of the energy storage system in the sixth working mode according to an embodiment of the present application;

[0070] Figure 29 Figure 14 is a structural schematic diagram of the energy storage system according to an embodiment of the present application.

[0071] Reference signs:

[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 accumulator 115, dehumidification heat exchanger 116, second expansion valve 117;

[0074] energy storage battery 12;

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

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

[0077] second flow path 16, second pump 161, second heat sink 162;

[0078] water tank 17, water receiving groove 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] Embodiments of the present application are described below in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are for the purpose of explanation only, and are not to be understood as limiting the present application.

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

[0083] The following describes an energy storage system 10 according to embodiments of the present application. Figures 1-29

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

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

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

[0087] The cooling liquid in the first flow path 13 can exchange heat with the heat exchange portion of the energy storage battery 12 to achieve thermal management of the energy storage battery 12; the cooling liquid in the second flow path 16 can exchange heat with the heat exchange portion of the electronic device 15 to achieve thermal management of the electronic device 15.

[0088] The electronic device 15 can be a high-heat device in the energy storage system 10, and specifically, the electronic device 15 can include but is not limited to a power conversion assembly, a communication module, a detection module, or an interaction module, etc. For example, in some embodiments, the electronic device 15 is a power conversion assembly.

[0089] It can be understood that, taking the electronic device as an inverter for example, the working temperature ranges and heat dissipation requirements of the energy storage battery and the inverter are different. Specifically, the energy storage battery is usually best operated at 20-35°C, while the inverter can work in a wider temperature range (25-60°C). In related technologies, the energy storage battery and the inverter are connected in series in the same circuit and use the same heat sink for heat dissipation, which cannot meet the different heat dissipation requirements of the two. For example, if the design of the heat sink is mainly based on the heat dissipation requirement of the inverter, the energy storage battery cannot be sufficiently cooled, and vice versa. If the design of the heat sink is mainly based on the heat dissipation requirement of the energy storage battery, the heat exchange capacity requirement of the heat sink is more severe, and a large-scale and more complex heat sink 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, as shown in Figures 2-6 ,Figures 9-14 , Figures 16-21 and Figures 23-28 As shown, the energy storage system 10 can be configured with multiple thermal management modes. Each thermal management mode has a different temperature control method for the energy storage battery 12 and electronic devices 15. These multiple thermal management modes may include, but are not limited to: First, in active cooling mode, the evaporator 114 of the cooling circuit 11 can dissipate heat from the energy storage battery 12, while the first heat sink 14 and the second heat sink 162 can dissipate heat from the electronic devices 15 and the condenser 112 of the cooling circuit 11; Second, in natural cooling mode, the first heat sink 14 can dissipate heat from the energy storage battery 12, while the second heat sink 162 can dissipate heat from the electronic devices 15; Third, in electric heating mode, the heater 132... The energy storage battery 12 can be heated; fourth, in active temperature equalization mode, the coolant is driven to circulate to promote internal temperature equalization of the energy storage battery 12; fifth, in liquid replenishment and venting mode, the liquid replenishment port and venting port of the water-side component are opened, and the coolant is replenished and the internal gas is discharged during the circulation of the coolant; sixth, in heat pump heating mode, the condenser 112 can heat the energy storage battery 12, and at the same time, the electronic device 15, the first heat sink 14 and the second heat sink 162 can supplement the heat of the evaporator 114. If the heat provided by the refrigeration circuit 11 is still insufficient to meet the demand, the condenser 112 and the heater 132 can work together to heat the energy storage battery 12.

[0091] It should be noted that in 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 this application embodiment, through the arrangement of the first radiator 14, the second radiator 162 and the valve group 21, uses corresponding radiators to dissipate heat for the energy storage battery 12 and electronic device 15 with different inlet water 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 manufacturing and maintenance costs; at the same time, it can realize multiple thermal management modes by using water circulation switching, reducing the overuse of the cooling circuit 11, reducing the energy consumption throughout the product's life cycle, thereby improving the overall performance and thus improving the system's operating energy efficiency; and it increases the integration of water-side components, thereby reducing the volume of the liquid cooling unit, and thus increasing the energy density of the energy storage system 10.

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

[0094] As shown in Figures 1-6 , 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, 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, as shown in Figures 1-6 , 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 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 respectively. By changing the connection relationship 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 the active refrigeration mode, the natural cooling mode, the electric heating mode, the active uniform temperature mode and the liquid supplementing and exhaust mode.

[0096] The energy storage system 10 provided by the embodiment of the present application, through the above-mentioned setting of the first valve 211 and the second valve 212, in combination with the design that the first valve 211 has four valve ports and the second valve 212 has four valve ports, considering that the heat pump heating mode has less frequency of use in actual application, the number of valve ports is reduced as much as possible under the premise of not affecting the core heat management function of the energy storage system 10, thereby significantly simplifying the water path structure, further improving the energy density of the energy storage system 10, and reducing the complexity of pipe arrangement and the design difficulty of the control system, so that the energy storage system 10 can be applied to common scenes with greater cost advantage, and the miniaturization and lightweight design of the energy storage system 10 are realized.

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

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

[0099] In this embodiment, such as Figure 7 As shown, based on 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 added to the second valve 212. Furthermore, two branches are added to the existing piping layout. A first three-way valve 101 is installed 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. A second three-way valve 102 is installed at the inlet of the second radiator 162. The three-way valve 102 is connected to the newly added fifth valve port B5 on the second valve 212 via another branch. Considering that the simplified scheme above does not have a heat pump heating mode, in order to further meet the heating requirements of the energy storage battery 12 in extremely cold environments, in the case that 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 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; the valve port of the first three-way valve 101 connected to the third valve port B3 of the second valve 212 is connected to the valve port of the first three-way valve 101 connected to the fifth valve port A5 of the first valve 211; the valve port of the second three-way valve 102 connected to the outlet of the heat exchange section of the electronic device 15 is connected to the valve port of the second three-way valve 102 connected to the first valve 211. The valve port connected to the fifth valve port A5 of 11 allows the coolant to pass sequentially through the heat exchange section of electronic device 15, the second three-way valve 102, the second path of evaporator 114, the first pump 131, the heat exchange section of energy storage battery 12, the heater 132, the first three-way valve 101, the second path of condenser 112, and the second pump 161. The compressor 111, the first radiator 14, and the second radiator 162 are not working, while the first pump 131 and the second pump 161 are working. The heater 132 can be switched on and off according to the actual situation of the energy storage battery 12.

[0100] The energy storage system 10 provided by the embodiment of the present application adds one valve port to the first valve 211 and the second valve 212 respectively on the basis of the four valve ports of the first valve 211 and the four valve ports of the second valve 212, shields the passage where the first radiator 14 and the second radiator 162 are located by controlling the valve port on-off of the first valve 211, the second valve 212, the first three-way valve 101 and the second three-way valve 102, and makes the cooling liquid skillfully bypass the first radiator 14 and the second radiator 162 on the premise of passing through the electronic device 15, so as to realize the waste heat utilization mode. In a low-temperature environment, the waste heat of the electronic device 15 is utilized to heat the energy storage battery 12, so as to reduce the loss of waste heat as much as possible. Meanwhile, if the waste heat of the electronic device 15 is insufficient to meet the heat demand of the energy storage battery 12, the heater 132 can also be started to heat the energy storage battery 12 together with the waste heat, so as to optimize the heating effect of the waste heat utilization mode without affecting the energy density of the energy storage system 10.

[0101] In some embodiments, as shown in FIG. 1, Figures 8-14 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, as shown in FIG. 1, Figures 8-14 The valve group 21 is a ten-way valve, and the ten valve ports can be respectively connected to the inlets and outlets of the first radiator 14, the inlets and outlets of the second path of the condenser 112, the inlets and outlets of the second path of the evaporator 114, the inlets and outlets of the first flow path 13, and the inlets and outlets of the second flow path 16. By changing the connection relationship 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 the active refrigeration mode, the natural cooling mode, the electric heating mode, the active uniform temperature mode, the liquid supplementing and exhaust mode and the heat pump heating mode.

[0103] The energy storage system 10 provided in this application embodiment utilizes a structural design that integrates the first to tenth valve ports into a single valve, further improving the integration of water-side components. This allows all water-side pipelines to be centrally arranged at the ten-way valve, minimizing the space occupied by the liquid cooling unit and significantly increasing the energy density of the entire energy storage system 10. This achieves overall miniaturization and lightweight design. Furthermore, by controlling the on / off state of the ten valve ports, it enables active cooling mode, natural cooling mode, electric heating mode, active temperature equalization mode, liquid replenishment and exhaust mode, and heat pump heating mode, thereby increasing the versatility of the energy storage system 10.

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

[0105] like Figures 15-21 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, such as Figures 15-21 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 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, respectively. By changing the connection relationship 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 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, respectively.

[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 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, respectively.

[0109] The energy storage system 10 provided in this application embodiment, through the setting of the third valve 213 and the fourth valve 214, utilizes the separate design of the two valves so that after assembly, the various pipelines do not need to be piled up in the same position. This facilitates the identification of pipelines by relevant operators during maintenance and repair, improves the maintainability of the entire energy storage thermal management system, reduces the complexity of pipe laying, shortens the time required for valve group 21 assembly, and is conducive to 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, 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 application range of the energy storage system 10.

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

[0111] like Figures 22-28 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 G1 of the sixth valve 216 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 outlet of the first radiator 14, the second valve port F2 of the fifth valve 215 can be connected to the outlet of the second radiator 14, the third valve port F3 of the fifth valve 215 can be connected to the inlet of the second flow path 16, and the second valve port F3 of the sixth 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 outlet of the second radiator 14, the third valve port F3 of the fifth valve 215 can be connected to the inlet of the second flow path 16, and the third valve port F4 of the sixth valve 215 can be connected to the outlet of the second radiator 14, the second valve port F2 of the fifth valve 215 can be connected to the outlet of the second radiator 14, the third valve port F3 of the fifth valve 215 can be connected to the outlet of the second radiator 14, the third valve port F4 of the fifth valve 215 can be connected to the outlet of the second radiator 14, the third valve port F3 of the fifth valve Port G2 can be connected to the outlet of the second path of condenser 112; the third valve port G3 of the sixth valve 216 can be connected to the inlet of the first flow path 13; the fourth valve port G4 of the sixth valve 216 can be connected to the outlet of the second path of 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, as shown in Figures 22-28 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, one valve port of the fifth valve 215 can be connected with one valve port of the seventh valve 217, 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 connected with 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 respectively. 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 the active refrigeration mode, the natural cooling mode, the electric heating mode, the active uniform temperature mode, the liquid supplementing and exhaust mode, and the heat pump heating mode.

[0113] The energy storage system 10 provided by the embodiment of the present application is provided with the fifth valve 215, the sixth valve 216, and the seventh valve 217, which are designed separately, so that the pipelines do not need to be stacked in the same position after assembly, which is convenient for the relevant operating personnel to identify the pipelines during maintenance and repair, further improves the maintainability of the entire energy storage thermal management system, maximally reduces the complexity of pipeline arrangement, shortens the assembly time of the valve group 21, is conducive to mass production, and realizes the active refrigeration mode, the natural cooling mode, the electric heating mode, the active uniform temperature mode, the liquid supplementing and exhaust mode, and the heat pump heating mode by controlling the on-off state of each valve port of the fifth valve 215, the sixth valve 216, and the seventh valve 217, thereby widening the use range of the energy storage system 10.

[0114] In some embodiments, as shown in Figure 2 , Figure 9 , Figure 16 and Figure 23 The energy storage system 10 has a first working mode, in which 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 in sequence, and the second path of the evaporator 114 and the first flow path 13 are connected in sequence.

[0115] It should be noted that the first working mode is the active refrigeration mode described above.

[0116] As shown in Figure 2As shown, when the energy storage system 10 includes a first valve 211 and a second valve 212, when the energy storage system 10 switches to the first operating mode, the on / off states of each valve port of the first valve 211 and the second valve 212 are as follows: 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 Figure 9 As shown, when the energy storage system 10 switches to the first working mode, the on / off states of each valve port of the valve group 21 are as follows: 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 Figure 16 As shown, when the energy storage system 10 includes a third valve 213 and a fourth valve 214, when the energy storage system 10 switches to the first operating mode, the on / off states of each valve port 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 Figure 23 As shown, when the energy storage system 10 includes a fifth valve 215, a sixth valve 216, and a seventh valve 217, and the energy storage system 10 switches to the first operating mode, the on / off states of each valve port 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 by the embodiments of the present application realizes fluorine cooling heat dissipation of the energy storage battery 12 by the first working mode, and simultaneously realizes heat dissipation of the electronic device 15 and the condenser 112 by the first heat sink 14 and the second heat sink 162, so as to meet the heat dissipation requirements of the energy storage battery 12, the electronic device 15 and the condenser 112, and relieve a series of domino effects of thermal runaway of the energy storage battery 12 due to over-temperature, thereby prolonging the service life of the energy storage battery 12.

[0121] In some embodiments, as shown in Figure 3 , Figure 10 , Figure 17 and Figure 24 , the energy storage system 10 has a second working mode. In the second working mode, the first pump 131, the first heat sink 14, the second pump 161 and the second heat sink 162 all work, the compressor 111 and the heater 132 are stopped, the second path of the condenser 112 and the second flow path 16 are connected in a head-to-tail manner, and the second path of the evaporator 114, the first flow path 13 and the first heat sink 14 are connected in a head-to-tail manner.

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

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

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

[0125] As shown in Figure 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 switches to the second working mode, the on-off state of each valve port of the third valve 213 and the fourth valve 214 is: the first valve port D1 of the third valve 213 communicates with the sixth valve port D6 of the third valve 213, the second valve port D2 of the third valve 213 communicates with the fourth valve port D4 of the third valve 213, and the third valve port D3 of the third valve 213 communicates with the fifth valve port D5 of the third valve 213; the first valve port E1 of the fourth valve 214 communicates with the second valve port E2 of the fourth valve 214, and the third valve port E3 of the fourth valve 214 communicates with the fourth valve port E4 of the fourth valve 214.

[0126] As shown in FIG. 1, the energy storage system 10 includes a first valve 211, a second valve 212, a third valve 213, a fourth valve 214, a fifth valve 215, a sixth valve 216, and a seventh valve 217. Figure 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 switches to the second working mode, the on-off state of each valve port of the fifth valve 215, the sixth valve 216, and the seventh valve 217 is: the first valve port F1 of the fifth valve 215 communicates with the fourth valve port F4 of the fifth valve 215, and the second valve port F2 of the fifth valve 215 communicates with the third valve port F3 of the fifth valve 215; the first valve port G1 of the sixth valve 216 communicates with the second valve port G2 of the sixth valve 216, and the third valve port G3 of the sixth valve 216 communicates with the fourth valve port G4 of the sixth valve 216; the first valve port H1 of the seventh valve 217 communicates with the fourth valve port H4 of the seventh valve 217, and the second valve port H2 of the seventh valve 217 communicates with the third valve port H3 of the seventh valve 217.

[0127] The energy storage system 10 provided by the embodiments of the present application, through the design of the second working mode described above, realizes the wind cooling heat dissipation of the energy storage battery 12 by the first heat sink 14 in the case where the temperature of the energy storage battery 12 is relatively high, meets the basic heat dissipation requirement of the energy storage battery 12, prevents the unnecessary energy consumption caused by starting the refrigeration system when the temperature of the energy storage battery 12 is slightly increased, thereby improving the operation energy efficiency of the entire energy storage system 10 on the premise of not affecting the performance of the energy storage battery 12, and realizing the independent heat dissipation of the energy storage battery 12 and the electronic device 15 in the second working mode by using the second heat sink 162 to perform the wind cooling heat dissipation of the electronic device 15, thereby reducing the heat exchange capacity requirement of the first heat sink 14 and the second heat sink 162, reducing the system comprehensive energy consumption, and further effectively reducing the manufacturing cost and the maintenance cost.

[0128] In some embodiments, as shown in FIG. 1, Figure 4 , Figure 11 , Figure 18 and Figure 25As shown, the energy storage system 10 has a third working mode, in which 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] As shown in FIG. 6, 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 switches to the third working mode, the on-off state of each valve port of the first valve 211 and the second valve 212 is as follows: the first valve port A1 of the first valve 211 communicates with the second valve port A2 of the first valve 211, and the third valve port A3 of the first valve 211 communicates with the fourth valve port A4 of the first valve 211. Figure 4 As shown in FIG. 6, 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 switches to the third working mode, the on-off state of each valve port of the first valve 211 and the second valve 212 is as follows: the first valve port A1 of the first valve 211 communicates with the second valve port A2 of the first valve 211, and the third valve port A3 of the first valve 211 communicates with the fourth valve port A4 of the first valve 211.

[0131] Figure 11 As shown in FIG. 6, 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 switches to the third working mode, the on-off state of each valve port of the first valve 211 and the second valve 212 is as follows: the first valve port A1 of the first valve 211 communicates with the second valve port A2 of the first valve 211, and the third valve port A3 of the first valve 211 communicates with the fourth valve port A4 of the first valve 211.

[0132] As shown in FIG. 6, 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 switches to the third working mode, the on-off state of each valve port of the first valve 211 and the second valve 212 is as follows: the first valve port A1 of the first valve 211 communicates with the second valve port A2 of the first valve 211, and the third valve port A3 of the first valve 211 communicates with the fourth valve port A4 of the first valve 211. Figure 18 As shown in FIG. 6, 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 switches to the third working mode, the on-off state of each valve port of the first valve 211 and the second valve 212 is as follows: the first valve port A1 of the first valve 211 communicates with the second valve port A2 of the first valve 211, and the third valve port A3 of the first valve 211 communicates with the fourth valve port A4 of the first valve 211.

[0133] Figure 25 As shown in FIG. 6, 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 switches to the third working mode, the on-off state of each valve port of the first valve 211 and the second valve 212 is as follows: the first valve port A1 of the first valve 211 communicates with the second valve port A2 of the first valve 211, and the third valve port A3 of the first valve 211 communicates with the fourth valve port A4 of the first valve 211.

[0134] ​​The energy storage system 10 provided by the embodiments of the present application realizes the heating of the energy storage battery 12 by the heater 132 in the case that the temperature of the energy storage battery 12 is relatively low, meets the basic heat demand of the energy storage battery 12 in the low-temperature environment, and prevents unnecessary energy consumption caused by switching the heat pump heating mode when the temperature of the energy storage battery 12 is slightly lowered, so as to improve the operation energy efficiency of the entire energy storage system 10 without affecting the performance of the energy storage battery 12.

[0135] In some embodiments, as shown in Figures 1-29 The energy storage system 10 further includes a water tank 17. The air inlet of the water tank 17 is selectively communicated with 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 supplementing port.

[0136] As shown in Figure 5 , Figure 12 , Figure 19 and Figure 26 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 heat sink 14, the second heat sink 162 and the heater 132 are all stopped, the second path of the evaporator 114, the first flow path 13, the first heat sink 14, the second path of the condenser 112 and the second flow path 16 are sequentially connected in series, and the air inlet of the water tank 17 is communicated with the first flow path 13.

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

[0138] In this embodiment, as shown in Figures 1-29 The liquid supplementing 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 dashed 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 liquid supplementing port is arranged close to the outlet of the heat exchange part of the energy storage battery 12, for example, the liquid supplementing 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 supplemented cooling liquid can enter the first flow path 13 from the liquid supplementing port, and then circulate between the second path of the evaporator 114, the first flow path 13, the first heat sink 14, the second path of the condenser 112 and the second flow path 16. With the flow of the supplemented cooling liquid, the excess gas in the water side pipeline can also be exhausted into the water tank 17 through the exhaust port, and finally exhausted from the air outlet of the water tank 17.

[0139] As shown in Figure 5As shown, when the energy storage system 10 includes a first valve 211 and a second valve 212, when the energy storage system 10 switches to the fourth operating mode, the on / off states of each valve port of the first valve 211 and the second valve 212 are as follows: 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 Figure 12 As shown, when the energy storage system 10 switches to the fourth operating mode, with valve group 21 having the first to tenth valve ports, the on / off states of each valve port of valve group 21 are as follows: the first valve port C1 of valve group 21 is connected to the ninth valve port C9 of valve group 21, the second valve port C2 of valve group 21 is connected to the fourth valve port C4 of valve group 21, the third valve port C3 of valve group 21 is connected to the tenth valve port C10 of valve group 21, the fifth valve port C5 of valve group 21 is connected to the seventh valve port C7 of valve group 21, and the sixth valve port C6 of valve group 21 is connected to the eighth valve port C8 of valve group 21.

[0141] like Figure 19 As shown, when the energy storage system 10 includes a third valve 213 and a fourth valve 214, when the energy storage system 10 switches to the fourth operating mode, the on / off states of each valve port 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 Figure 26 As shown, when the energy storage system 10 includes a fifth valve 215, a sixth valve 216, and a seventh valve 217, and the energy storage system 10 switches to the fourth operating mode, the on / off states of each valve port 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 by the embodiments of the present application realizes the supplement of the cooling liquid in the water-side flow path and the timely discharge of the exhaust gas through the design of the fourth working mode, so that the cooling water in the thermal management system is always kept at a suitable level, the probability of system overheating or other operation problems caused by insufficient cooling water is reduced, and heat is effectively transferred from the energy storage battery 12 and the electronic device 15 to the first heat sink 14 and the second heat sink 162, while the outward exhaust gas can eliminate the air bubbles in the water-side flow path, prevent the increase of thermal resistance caused by the bubbles blocking the pipeline, and further improve the overall cooling efficiency of the system. In addition, the timely supplement of the cooling liquid and the exhaust gas can reduce corrosion and deposits in the system, keep the pipeline clean, and further prolong the service life of the energy storage system 10.

[0144] In some embodiments, as shown in Figure 6 , Figure 13 , Figure 20 and Figure 27 , the energy storage system 10 has a fifth working mode, in which the first pump 131 is working, the compressor 111, the first heat sink 14, the second pump 161, the second heat sink 162 and the heater 132 are all shut down, 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 active uniform temperature mode described above.

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

[0147] As shown in Figure 13 , when the valve group 21 has the first to tenth valve ports, the on-off state of each valve port of the valve group 21 is as follows when the energy storage system 10 switches to the fifth working mode: the fourth valve port C4 of the valve group 21 is in communication with the tenth valve port C10 of the valve group 21, and the sixth valve port C6 of the valve group 21 is in communication with the eighth valve port C8 of the valve group 21.

[0148] As shown in Figure 20As shown, when the energy storage system 10 includes a third valve 213 and a fourth valve 214, when the energy storage system 10 switches to the fifth operating mode, the on / off states of each valve port 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 Figure 27 As shown, when the energy storage system 10 includes a fifth valve 215, a sixth valve 216, and a seventh valve 217, when the energy storage system 10 switches to the fifth operating mode, the on / off states of each valve port 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; and 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 this application embodiment, through the design of the fifth working mode described above, utilizes coolant circulation to actively equalize the temperature of the entire energy storage system 10. Considering that the system heat dissipation pressure is relatively small at this time, no additional heat dissipation configuration is required, which improves the temperature uniformity of multiple battery cells in the energy storage battery 12, and at the same time improves the temperature uniformity of the entire energy storage system 10 under moderate ambient temperature conditions.

[0151] In some embodiments, such as Figure 14 , Figure 21 and Figure 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 and the first flow path 13 of the condenser 112 are connected end to end. The second path, the second flow path 16 of the evaporator 114 and the first radiator 14 are connected end to end in sequence.

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

[0153] like Figure 14As shown, when the energy storage system 10 switches to the sixth operating mode, with valve group 21 having the first to tenth valve ports, the on / off states of each valve port of valve group 21 are as follows: the first valve port C1 of valve group 21 is connected to the tenth valve port C10 of valve group 21, the second valve port C2 of valve group 21 is connected to the third valve port C3 of valve group 21, the fourth valve port C4 of valve group 21 is connected to the ninth valve port C9 of valve group 21, the fifth valve port C5 of valve group 21 is connected to the eighth valve port C8 of valve group 21, and the sixth valve port C6 of valve group 21 is connected to the seventh valve port C7 of valve group 21.

[0154] like Figure 21 As shown, when the energy storage system 10 includes a third valve 213 and a fourth valve 214, when the energy storage system 10 switches to the sixth operating mode, the on / off states of each valve port 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 Figure 28 As shown, when the energy storage system 10 includes a fifth valve 215, a sixth valve 216, and a seventh valve 217, and the energy storage system 10 switches to the sixth operating mode, the on / off states of each valve port 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 by the embodiments of the present application realizes heating of the energy storage battery 12 by the condenser 112 of the refrigeration circuit 11 in the case of excessively low temperature of the energy storage battery 12, so that the energy storage battery 12 can normally work in a low-temperature environment, and the performance of the energy storage system 10 is optimized. Meanwhile, the waste heat of the electronic device 15 is used to supplement the low-pressure end of the refrigerant circulation, so that the effect of combined heating of the electronic device 15 and the compressor 111 is achieved. If the waste heat of the electronic device 15 and the heating capacity of the compressor 111 are insufficient to meet the heat demand of the energy storage battery 12, the heater 132 can also be started to heat, and the waste heat of the electronic device 15 and the heating of the compressor 111 jointly provide heat to realize excess heat 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 can further include a dehumidification branch.

[0158] As shown in Figures 1-29 The dehumidification branch can be connected in parallel to the series connection 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 embodiments of the present application will be described in detail from two different implementation angles respectively.

[0160] I. 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 to work, the first expansion valve 113 is closed, the second expansion valve 117 is opened, and the low-temperature refrigerant flows out from the outlet of the first path of the condenser 112 and then flows into the dehumidification branch. Meanwhile, the second flow path 16, the second path of the condenser 112 and the first heat sink 14 can be sequentially connected end to end, and the first heat sink 14 and the second heat sink 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, and finally the condensed water is collected to complete the dehumidification process.

[0162] II. The dehumidification heat exchanger 116 and the evaporator 114 both work.

[0163] In actual implementation, when the energy storage system 10 needs to start the dehumidification function, the compressor 111 starts to work, the first expansion valve 113 and the second expansion valve 117 are both opened, and part of the low-temperature refrigerant flows into the dehumidification branch after flowing out from the outlet of the first path of the condenser 112, 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 component. In the process of the low-temperature refrigerant flowing through the dehumidification heat exchanger 116, the water vapor in the air is condensed 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, in the case that the dehumidification heat exchanger 116 and the evaporator 114 both work, the on-off state of the valve ports of the valve group 21 can refer to the on-off state of the valve ports in the first working mode to the sixth working mode. The on-off state of the valve ports in the first working mode to the sixth working mode has been described in detail in the foregoing, and will not be described here.

[0165] The energy storage system 10 provided by the embodiment of the present application can realize the independent dehumidification function of the energy storage system 10 by controlling the opening and closing of the first expansion valve 113 and the second expansion valve 117 through the dehumidification heat exchanger 116 and the second expansion valve 117, and can maximize the dehumidification effect. The dehumidification effect is also optimized, and the thermal management demand of the energy storage battery 12 and the dehumidification demand of the system are considered, thereby increasing the practicability and use width of the entire energy storage system 10.

[0166] In some embodiments, as shown in Figure 29 The energy storage system 10 can further include a water collecting tank 18 and a spraying device 19.

[0167] The water collecting tank 18 can be located below the dehumidification heat exchanger 116 in the direction of gravity, and the water collecting tank 18 can be used to collect and accumulate condensed water; the spraying device 19 can be in communication with the water collecting tank 18, and the spraying port of the spraying device 19 is adapted to face at least one of the first heat sink 14 and the second heat sink 162.

[0168] In this embodiment, as shown in Figure 29As shown, the spraying device 19 can include a spray head 191, a conveying pipe 192, and a third pump 193. The inlet of the conveying pipe 192 is connected to the water collecting groove 18, the outlet of the conveying pipe 192 is connected to the spray head 191, and the third pump 193 is used to drive the flow of the condensed water in the conveying pipe 192. The spray head 191 can be arranged to face the first heat sink 14. The condensed water accumulated in the water collecting groove 18 can be sprayed to the surface of the first heat sink 14 by the spraying device 19. The heat absorption of the rapid evaporation of the condensed water can be used to improve the heat dissipation rate of the first heat sink 14.

[0169] In some other embodiments, the spray head 191 can have a plurality of spray openings, and the plurality of spray openings can be arranged to face the first heat sink 14 and the second heat sink 162, respectively. Alternatively, the spraying device 19 can include a plurality of spray heads 191, and the spray openings of the plurality of spray heads 191 can be arranged to face the first heat sink 14 and the second heat sink 162, respectively. The condensed water accumulated in the water collecting groove 18 can be sprayed to the surfaces of the first heat sink 14 and the second heat sink 162 by the spraying device 19. The heat absorption of the rapid evaporation of the condensed water can be used to improve the heat dissipation rates of the first heat sink 14 and the second heat sink 162.

[0170] In some other embodiments, the spray head 191 can have a plurality of spray openings, and the plurality of spray openings can be arranged to face the first heat sink 14 and the second heat sink 162, respectively. Alternatively, the spraying device 19 can include a plurality of spray heads 191, and the spray openings of the plurality of spray heads 191 can be arranged to face the first heat sink 14 and the second heat sink 162, respectively. The condensed water accumulated in the water collecting groove 18 can be sprayed to the surfaces of the first heat sink 14 and the second heat sink 162 by the spraying device 19. The heat absorption of the rapid evaporation of the condensed water can be used to improve the heat dissipation rates of the first heat sink 14 and the second heat sink 162.

[0171] The energy storage system 10 provided by the embodiments of the present application can realize the collection and reuse of the condensed water through the arrangement of the water collecting groove 18 and the spraying device 19. The condensed water collected from the dehumidification heat exchanger 116 can be sprayed on the first heat sink 14 and / or the second heat sink 162 to rapidly reduce the temperature of the first heat sink 14 and / or the second heat sink 162, enhance the heat exchange capacity of the first heat sink 14 and / or the second heat sink 162, and improve the working performance of the refrigeration circuit 11. The energy consumption of the system is reduced, the condensed water is effectively utilized, the environmental protection requirements of energy saving and emission reduction are met, and the intelligent and accurate heat dissipation control can be realized through the automatic adjustment of the spraying water amount and the spraying time of the spraying device 19 according to the temperature of the first heat sink 14 and / or the second heat sink 162 and the running state of the system.

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

[0173] In some embodiments, the photovoltaic energy storage system includes a photovoltaic power generation system and the energy storage system 10 as 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 can include a photovoltaic assembly and an inverter unit, the energy storage battery 12 in the energy storage system 10 can be connected to direct current output by the photovoltaic assembly, and other electrical modules in the energy storage system 10 can be connected to alternating current output by the inverter unit.

[0176] The photovoltaic energy storage system provided by the embodiment of the present application can separately cool the energy storage battery 12 and the electronic device 15 with different water inlet temperature requirements by using the corresponding heat sink, thereby reducing the heat exchange capacity requirement of the first heat sink 14 and the second heat sink 162, reducing the comprehensive energy consumption of the system, and effectively reducing the manufacturing cost and the maintenance cost; meanwhile, the waterway circulation switching can be used to realize multiple heat management modes, reduce the overuse of the refrigeration circuit 11, reduce the energy consumption of the product in the whole life cycle, thereby improving the comprehensive use performance, and improving the system operation energy efficiency; and the integration of the water side components is improved, thereby reducing the volume of the liquid cooling unit, and improving the energy density of the energy storage system 10.

[0177] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually a class, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0178] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0179] In the description of the present application, "first feature" and "second feature" can include one or more features.

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

[0181] In the description of the present application, "above" or "below" the first feature in the second feature can include direct contact between the first and second features, or can include indirect contact between the first and second features through another feature therebetween.

[0182] In the description of the application, above, over and on are used to indicate that the first feature is above, over or on the second feature, either directly or obliquely above, or simply that the first feature is at a higher level than the second feature.

[0183] In the description of the application, references to "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "in some embodiments", "in an illustrative embodiment", "an example", "a specific example", or "some examples" in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0184] Although embodiments of the application have been illustrated and described, it will be clear to those of ordinary skill in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the principles and the spirit of the application. The scope of the application is limited only by the claims and the equivalents thereof.

Claims

1. An energy storage system, characterized by, The application relates to a refrigeration system, comprising: a refrigeration circuit comprising a compressor, a first circuit of a condenser, a first expansion valve and a first circuit of an evaporator; a first flow circuit, a heat exchange part of an energy storage battery being communicated with the first flow circuit, and the first flow circuit comprising a first pump and a heater; a first heat sink; an electronic device and a second flow circuit, a heat exchange part of the electronic device being communicated with the second flow circuit, and the second flow circuit comprising a second pump and a second heat sink; a valve group, a plurality of valve ports of the valve group being connected with a second circuit of the condenser, a second circuit of the evaporator, the first heat sink, the first flow circuit and the second flow circuit respectively, and the plurality of valve ports of the valve group being selectively opened and closed; wherein, the valve group comprises a first valve and a second valve, a first valve port of the first valve being connected with an inlet of the first heat sink, a second valve port of the first valve being connected with a fourth valve port of the second valve, a third valve port of the first valve being connected with an inlet of the second circuit of the evaporator, and a fourth valve port of the first valve being connected with an outlet of the first flow circuit; a first valve port of the second valve being connected with an outlet of the second flow circuit, a second valve port of the second valve being connected with an inlet of the second circuit of the condenser, and a third valve port of the second valve being connected with an outlet of the first heat sink; an inlet of the first flow circuit being connected with an outlet of the second circuit of the evaporator, and an inlet of the second flow circuit being connected with an outlet of the second circuit of the condenser; the energy storage system further comprises a first three-way valve and a second three-way valve, three valve ports of the first three-way valve being connected with a fifth valve port of the first valve, a third valve port of the second valve and an outlet of the first heat sink respectively, and three valve ports of the second three-way valve being connected with an inlet of the second heat sink, an outlet of the heat exchange part of the electronic device and a fifth valve port of the second valve respectively; or, the valve group has first to tenth valve ports, wherein a first valve port is connected with an outlet of the first heat sink, a second valve port is connected with an inlet of the first heat sink, a third valve port is connected with an outlet of the second flow circuit, a fourth valve port is connected with an outlet of the first flow circuit, a fifth valve port is connected with an inlet of the second flow circuit, a sixth valve port is connected with an inlet of the first flow circuit, a seventh valve port is connected with an outlet of the second circuit of the condenser, an eighth valve port is connected with an outlet of the second circuit of the evaporator, a ninth valve port is connected with an inlet of the second circuit of the condenser, and a tenth valve port is connected with an inlet of the second circuit of the evaporator; or, The valve group comprises a third valve and a fourth valve, the first valve port of the third valve is connected to the outlet of the first radiator, the second valve port of the third valve is connected to the inlet of the first radiator, the third valve port of the third valve is connected to the outlet of the second flow path, the fourth valve port of the third valve is connected to the outlet of the first flow path, the fifth valve port of the third valve is connected to the inlet of the second path of the condenser, and the sixth valve port of the third valve is connected to the inlet of the second path of the evaporator; the first valve port of the fourth valve is connected to the inlet of the second flow path, the second valve port of the fourth valve is connected to the outlet of the second path of the condenser, the third valve port of the fourth valve is connected to the inlet of the first flow path, and the fourth valve port of the fourth valve is connected to the outlet of the second path of the evaporator. Or, The valve group comprises a fifth valve, a sixth valve and a 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, 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.

2. The energy storage system of claim 1, wherein, The energy storage system has a first working mode, in which the compressor, the first pump, the first radiator, the second pump and the second radiator all work, the heater is stopped, and the first radiator, the second path of the condenser and the second flow path are connected in sequence.

3. The energy storage system of claim 1, wherein, The energy storage system has a second working mode, in which the first pump, the first radiator, the second pump and the second radiator all work, the compressor and the heater are stopped, the second path of the condenser and the second flow path are connected in sequence, and the second path of the evaporator, the first flow path and the first radiator are connected in sequence.

4. The energy storage system of claim 1, wherein, The energy storage system has a third working mode, in which the first pump and the heater work, and the compressor, the first radiator, the second pump and the second radiator are all stopped, and the second path of the evaporator and the first flow path are connected in sequence.

5. The energy storage system of claim 1, wherein, Further comprising: a water tank, an air inlet of the water tank being selectively communicated with the first flow path, and at least one of the first flow path and the second flow path being provided with a liquid supplementing port; The energy storage system has a fourth working mode, in which the first pump and the second pump work, the compressor, the first radiator, the second radiator and the heater are all shut down, 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 in sequence, and the air inlet of the water tank is communicated with the first flow path.

6. The energy storage system of claim 1, wherein, The energy storage system has a fifth working mode, in which the first pump works, the compressor, the first radiator, the second pump, the second radiator and the heater are all shut down, and the second path of the evaporator and the first flow path are connected in sequence.

7. The energy storage system of claim 1, wherein, The energy storage system has a sixth working mode, in which the compressor, the first pump, the first radiator, the second pump and the second radiator all work, the second path of the condenser and the first flow path are connected in sequence, and the second path of the evaporator, the second flow path and the first radiator are connected in sequence.

8. The energy storage system of any one of claims 1-7, wherein, The refrigeration circuit further comprises: A dehumidification branch connected in parallel to the series connection of the first path of the evaporator and the first expansion valve, and comprising a dehumidification heat exchanger and a second expansion valve.

9. The energy storage system of claim 8, wherein, Further comprising: A water collecting tank located below the dehumidification heat exchanger in the direction of gravity, for collecting and accumulating condensed water; A spraying device communicated with the water collecting tank, and a spraying opening of the spraying device is adapted to face at least one of the first radiator and the second radiator.

10. A photovoltaic energy storage system, characterized by, The energy storage system as claimed in any one of claims 1-9; A photovoltaic power generation system for supplying power to the energy storage system. The energy storage system as claimed in any one of claims 1-9; A photovoltaic power generation system for supplying power to the energy storage system.

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