Energy storage system and photovoltaic energy storage system

Abstract

The invention discloses an energy storage system and a photovoltaic energy storage system, and belongs to the technical field of energy storage. In the energy storage system, a refrigerating loop comprises a compressor, a first path of a condenser and an evaporator flow path, the evaporator flow path comprises a first branch and a second branch which are connected in parallel, the first branch comprises a first path of a first evaporator, and the second branch comprises a second evaporator used for dehumidification. At least one of the first branch and the second branch is selectively communicated to the compressor; the heat exchange part of the energy storage battery is communicated with the first flow path, and the first flow path comprises a first pump; the heat exchange part of the electronic device is communicated with a second flow path, and the second flow path comprises a second pump and a first radiator; and the eight-way valve is connected among the second path of the condenser, the second path of the first evaporator, the first flow path and the second flow path. By means of the structure, the independent dehumidification function can be achieved, the dehumidification effect is optimized, part of refrigerants can be extracted for synchronous dehumidification, the heat management and dehumidification requirements are considered, and the use width of the system is increased.

Description

Technical Field

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

[0002] With the rapid development of fields such as renewable energy and electric vehicles, efficient and reliable energy storage systems have become one of the key technologies. Traditional energy storage systems are mainly designed to store and release electrical energy, but pay less attention to thermal management, environmental humidity control, and integration with other systems. In particular, in some specific application scenarios, such as humid environments or places where humidity needs to be precisely controlled, the dehumidification capacity of the energy storage system is particularly important. However, existing energy storage systems often lack an effective dehumidification mechanism, resulting in excessive humidity inside the system, affecting the performance and life of energy storage batteries and electronic devices. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an energy storage system and a photovoltaic energy storage system to achieve independent dehumidification function, maximize the dehumidification effect, maintain the efficient operation of energy storage batteries and electronic devices, and extract part of the refrigerant for synchronous dehumidification, taking into account both thermal management requirements and dehumidification requirements, and increasing the practicality and usage width of the energy storage system.

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

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

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

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

[0008] An eight-way valve is connected to the second path of the condenser, the second path of the first evaporator, the first flow path and the second flow path, and the eight valve ports of the eight-way valve can be selectively opened and closed.

[0009] According to the energy storage system of the present application, by setting the above-mentioned first branch and second branch connected in parallel, controlling the on-off state between the compressor and the first branch and the second branch, it is possible to realize the independent dehumidification function of the energy storage system, maximize the dehumidification effect, maintain the efficient operation of the energy storage battery and the electronic devices, and at the same time, extract part of the refrigerant for synchronous dehumidification in a specific thermal management mode, taking into account the thermal management requirements of the energy storage battery and the dehumidification requirements of the energy storage system, thereby increasing the practicality and usage width of the entire energy storage system, and adopting an eight-way valve to integrate the thermal management flow path, reduce the volume of the liquid cooling unit, and improve the space utilization of the energy storage system. At the same time, multiple thermal management modes are realized, the comprehensive use performance is improved, and precise temperature control and humidity management are used to effectively prevent safety hazards and failure problems caused by overheating and overhumidity, thereby improving the overall reliability and safety of the energy storage system.

[0010] According to one embodiment of the present application, the first branch also includes a first expansion valve, which is connected between the first path of the condenser and the first path of the first evaporator, and the second branch also includes a second expansion valve, which is connected between the first path of the condenser and the second evaporator.

[0011] According to one embodiment of the present application, the refrigeration circuit further includes:

[0012] a first valve connected in series between the condenser and the first expansion valve;

[0013] A supercooling branch is connected in parallel with the first valve and includes a second radiator and a second valve.

[0014] According to the energy storage system of the present application, through the setting of the above-mentioned first expansion valve and the second expansion valve, the refrigerant flow of the first branch and the second branch can be independently controlled to meet different refrigeration needs or dehumidification needs, and at the same time, the distribution of the refrigerant can be adjusted more flexibly to meet the needs of different thermal management modes, support multi-mode efficient operation, optimize the thermal management efficiency of the entire energy storage system, and be able to locate and handle problems more conveniently during maintenance. If the expansion valve of a branch fails, it can be replaced separately without affecting the operation of the entire energy storage system.

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

[0016] A heat dissipation fan, the energy storage system forms a heat dissipation duct, the heat dissipation fan is used to drive the air flow in the heat dissipation duct, the heat dissipation duct is connected to the gas flow channel of the first radiator and the gas flow channel of the second radiator, and the gas flow channel of the first radiator is arranged toward the gas flow channel of the second radiator.

[0017] According to one embodiment of the present application, the first valve port of the eight-way valve is connected to the inlet of the second path of the first evaporator, the second valve port of the eight-way valve is connected to the inlet of the second flow path, the third valve port of the eight-way valve is connected to the outlet of the first flow path, the fourth valve port of the eight-way valve is connected to the inlet of the second path of the condenser, the fifth valve port of the eight-way valve is connected to the outlet of the second path, the sixth valve port of the eight-way valve is connected to the outlet of the second path of the first evaporator, the seventh valve port of the eight-way valve is connected to the inlet of the first flow path, and the eighth valve port of the eight-way valve is connected to the outlet of the second path of the condenser.

[0018] According to one embodiment of the present application, the energy storage system further includes:

[0019] A water tank is connected to the seventh valve port of the eight-way valve.

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

[0021] A heater is connected between the eighth valve port of the eight-way valve and the outlet of the second path of the condenser.

[0022] According to one embodiment of the present application, the energy storage system has a first operating mode. In the first operating mode, the compressor, the condenser, the first radiator, the second evaporator and the second pump are working, and the first pump and the first evaporator are not working; the second branch is connected to the compressor, and the second flow path and the second path of the condenser are connected end to end.

[0023] According to the energy storage system of the present application, through the design of the above-mentioned first working mode, in this mode, the system focuses on the dehumidification function. The second evaporator, as a dedicated dehumidification element, absorbs moisture in the surrounding environment and condenses it into liquid water for discharge, thereby effectively reducing the ambient humidity. Since the first evaporator does not participate in the work, the system can concentrate resources on the dehumidification task and improve the dehumidification efficiency, so that the energy storage system can adapt to a wider range of environmental conditions, especially in high humidity environments. This is particularly important for some application scenarios with high humidity requirements, and by turning off the first pump and the first evaporator, unnecessary energy consumption is reduced. In the use scenario where only dehumidification is required and no thermal management of the energy storage battery is required, this design reduces energy waste and improves the overall energy efficiency of the energy storage system.

[0024] According to one embodiment of the present application, the energy storage system has a second operating mode. In the second operating mode, the compressor, the condenser, the first evaporator, the first radiator, the first pump and the second pump are working; the first flow path and the second path of the first evaporator are connected end to end, and the second flow path and the second path of the condenser are connected end to end.

[0025] According to one embodiment of the present application, the energy storage system has a third operating mode. In the third operating mode, the first radiator, the first pump and the second pump are working, and the compressor, the condenser, the first evaporator and the second evaporator are not working; the first flow path, the second path of the condenser, the second flow path and the second path of the first evaporator are connected end to end in sequence.

[0026] According to one embodiment of the present application, the energy storage system has a fourth working mode, in which the first flow path and the second path of the condenser are connected end to end, and the second flow path and the second path of the first evaporator are connected end to end, and the fourth working mode includes a first heating stage and a second heating stage; wherein,

[0027] In the first heating stage, the compressor, the condenser, the first evaporator, the first pump and the second pump are working, and the heater and the first radiator are not working; in the second heating stage, the compressor, the condenser, the first evaporator, the first pump, the second pump and the heater are working, and the first radiator is not working.

[0028] According to the energy storage system of the present application, through the design of the above-mentioned fourth working mode, when the temperature of the energy storage battery is too low, the system first switches to the first heating stage to use the condenser of the refrigeration circuit to heat the energy storage battery, so that the energy storage battery can work normally in a low temperature environment. When a higher heating power is required or the external ambient temperature is extremely low, the system can switch to the second heating stage, so that the heater is activated and joins the work, and cooperates with the original thermal cycle system to provide additional heat output. This design enables the energy storage system to flexibly respond to different heating needs and environmental conditions, maintaining the stability and reliability of the heating effect. At the same time, by dividing the heating process into two stages, the system can select the most appropriate working mode according to the actual situation, avoiding problems such as overheating and overload that may occur in a single mode, and improving the stability and reliability of the system.

[0029] According to one embodiment of the present application, when the temperature of the energy storage battery is lower than a first target threshold and the electronic device is in a shutdown state, the energy storage system switches to the first heating stage of the fourth working mode; after the first heating stage continues to run for a target time, when the temperature of the energy storage battery is still lower than the first target threshold, the energy storage system switches to the second heating stage of the fourth working mode.

[0030] According to the energy storage system of the present application, through the switching logic design between the first heating stage and the second heating stage of the above-mentioned fourth working mode, when the temperature of the energy storage battery is too low and the electronic device is shut down, the fourth working mode is started in time, so that the energy storage battery operates within an appropriate temperature range, thereby extending the service life of the energy storage battery; at the same time, it can be flexibly adjusted according to the actual temperature of the energy storage battery. The first heating stage adopts a relatively mild heating method to prevent the rapid rise in temperature from causing an impact on the energy storage battery. If the temperature of the energy storage battery still does not reach the ideal range after the first heating stage, the second heating stage is entered, and a stronger heating measure is adopted until the temperature of the energy storage battery 12 returns to a safe range. This staged control strategy helps to achieve more accurate temperature management; and by real-time monitoring of the energy storage battery temperature and the operating status of the electronic device, the system automatically determines whether it is necessary to start the fourth working mode and when to adjust the heating stage. This intelligent judgment mechanism enables the energy storage system to self-regulate according to different environmental conditions and usage requirements, thereby improving the adaptability and reliability of the energy storage system.

[0031] According to one embodiment of the present application, the energy storage system has a fifth working mode, in which the first flow path, the second flow path of the condenser, the second flow path and the second flow path of the first evaporator are connected end to end in sequence, and the fifth working mode includes a first heating stage, a second heating stage and a third heating stage; wherein,

[0032] In the first heating stage, the first pump and the second pump are working, and the compressor, the condenser, the first evaporator, the first radiator and the heater are not working; in the second heating stage, the compressor, the condenser, the first evaporator, the first pump and the second pump are working, and the first radiator and the heater are not working; in the third heating stage, the compressor, the condenser, the first evaporator, the first pump, the second pump and the heater are working, and the first radiator is not working.

[0033] According to the energy storage system of the present application, through the design of the above-mentioned fifth working mode, the waste heat of electronic devices is used to heat the energy storage battery in a low-temperature environment, and the loss of waste heat is reduced as much as possible, which can significantly improve the energy utilization efficiency. At the same time, the quality of energy is fully considered. The waste heat of electronic devices can be firstly recovered to heat the energy storage battery, and the heat pump heating is turned on when the heat is insufficient. Finally, the heater is used for heating to achieve the cascade utilization of energy and realize energy saving. In addition, the operating status of each component is adjusted according to specific needs in each heating stage, realizing the flexibility of system operation. This staged control can be optimized according to conditions such as ambient temperature and equipment load to maximize the use of waste heat.

[0034] According to one embodiment of the present application, when the temperature of the energy storage battery is lower than a first target threshold and the electronic device is in working condition, the energy storage system switches to the first heating stage of the fifth working mode; after the first heating stage continues to run for a target time, when the temperature of the energy storage battery is still lower than the first target threshold, the energy storage system switches to the second heating stage of the fifth working mode; after the second heating stage continues to run for a target time, when the temperature of the energy storage battery is still lower than the first target threshold, the energy storage system switches to the third heating stage of the fifth working mode.

[0035] According to the energy storage system of the present application, through the switching logic design between the first heating stage, the second heating stage and the third heating stage of the above-mentioned fifth working mode, when the temperature of the energy storage battery is too low and the electronic device is working, the fifth working mode is started in time, so that the energy storage battery operates within a suitable temperature range, extending the service life of the energy storage battery, while minimizing the loss of waste heat. The staged control strategy helps to achieve more accurate temperature management; and by real-time monitoring of the energy storage battery temperature and the operating status of the electronic device, the system automatically determines whether it is necessary to start the fifth working mode and when to adjust the heating stage. This intelligent judgment mechanism enables the energy storage system to self-regulate according to different environmental conditions and usage requirements, thereby improving the adaptability and reliability of the energy storage system.

[0036] According to one embodiment of the present application, the energy storage system has a sixth operating mode. In the sixth operating mode, the first pump is working, and the compressor, the condenser, the first evaporator, the second evaporator, the first radiator and the second pump are not working; the first flow path and the second path of the first evaporator are connected end to end.

[0037] In a second aspect, the present application provides a photovoltaic energy storage system, the photovoltaic energy storage system comprising:

[0038] An energy storage system as described above;

[0039] A photovoltaic power generation system is used to supply power to the energy storage system.

[0040] According to the photovoltaic energy storage system of the present application, through the setting of the above-mentioned energy storage system, the independent dehumidification function of the energy storage system can be realized, and the dehumidification effect can be optimized to the maximum extent. At the same time, part of the refrigerant can be extracted for synchronous dehumidification under a specific thermal management mode, taking into account the thermal management requirements of the energy storage battery and the dehumidification requirements of the energy storage system, thereby increasing the practicality and usage width of the entire energy storage system, and adopting an eight-way valve to integrate the thermal management flow path, reduce the volume of the liquid cooling unit, and improve the space utilization rate of the energy storage system. At the same time, multiple thermal management modes are realized to improve the comprehensive use performance, and precise temperature control and humidity management are used to effectively prevent safety hazards and failure problems caused by overheating and overhumidity, thereby improving the overall reliability and safety of the energy storage system.

[0041] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0043] Figure 1 is a schematic diagram of the structure of the energy storage system provided in the embodiment of the present application;

[0044] Figure 2 is a schematic diagram of the structure of the energy storage system provided in the embodiment of the present application in the first working mode;

[0045] Figure 3 is a schematic diagram of the structure of the energy storage system provided in the embodiment of the present application in the second working mode;

[0046] Figure 4 is a schematic structural diagram of the energy storage system provided in an embodiment of the present application in a third working mode;

[0047] Figure 5 is a schematic structural diagram of the energy storage system provided in an embodiment of the present application in a fourth working mode;

[0048] Figure 6 is a schematic structural diagram of the energy storage system provided in an embodiment of the present application in a fifth working mode;

[0049] Figure 7 is a schematic diagram of the structure of the energy storage system provided in the embodiment of the present application in the sixth working mode;

[0050] Figure 8It is a control logic diagram of the energy storage system provided in the embodiment of the present application in the fourth working mode and the fifth working mode.

[0051] Reference numerals:

[0052] Energy storage system 10;

[0053] Refrigeration circuit 11, compressor 111, condenser 112, first expansion valve 113, first evaporator 114, second evaporator 115, second expansion valve 116, second radiator 117, first valve 118, second valve 119;

[0054] Energy storage battery 12;

[0055] First flow path 13, first pump 131;

[0056] Electronic device 14;

[0057] Second flow path 15, second pump 151, first radiator 152;

[0058] Water tank 16, heater 17, cooling fan 18, eight-way valve 19. DETAILED DESCRIPTION

[0059] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0060] The present application discloses an energy storage system 10 .

[0061] Reference below Figure 1-Figure 8 An energy storage system 10 according to an embodiment of the present application is described.

[0062] In some embodiments, Figure 1 As shown, the energy storage system 10 includes: a refrigeration circuit 11, an energy storage battery 12, a first flow path 13, an electronic device 14, a second flow path 15 and an eight-way valve 19.

[0063] like Figure 1 As shown, the refrigeration circuit 11 includes a compressor 111, a first path of a condenser 112 and an evaporator flow path, the evaporator flow path includes a first branch and a second branch connected in parallel, the first branch includes a first path of a first evaporator 114, the second branch includes a second evaporator 115, the second evaporator 115 is used for dehumidification, and at least one of the first branch and the second branch can be selectively connected to the compressor 111.

[0064] It can be understood that the first evaporator 114 is a refrigeration evaporator in the refrigeration circuit 11 for outputting cold to the outside, and the second evaporator 115 is a dehumidification evaporator in the refrigeration circuit 11 for absorbing water vapor. When the compressor 111 is turned on, at least one of the first evaporator 114 and the second evaporator 115 is in working condition. Specifically, the first evaporator 114 and the second evaporator 115 can operate synchronously or selectively.

[0065] like Figure 1-Figure 7 As shown, the heat exchange part of the energy storage battery 12 is connected to the first flow path 13, and the first flow path 13 includes a first pump 131; the heat exchange part of the electronic device 14 is connected to the second flow path 15, and the second flow path 15 includes a second pump 151 and a first radiator 152.

[0066] like Figure 1-Figure 7 As shown, the first radiator 152 , the electronic device 14 and the second pump 151 are sequentially connected to the pipeline of the first flow path 13 .

[0067] The first pump 131 drives the coolant in the first flow path 13 to circulate, and the coolant in the first flow path 13 can exchange heat with the heat exchange part of the energy storage battery 12 to achieve thermal management of the energy storage battery 12; the second pump 151 drives the coolant in the second flow path 15 to circulate, and the coolant in the second flow path 15 can exchange heat with the heat exchange part of the electronic device 14 to achieve thermal management of the electronic device 14.

[0068] Among them, the electronic device 14 can be a high-heat generating device in the energy storage system 10. Specifically, the electronic device 14 can include but is not limited to a power conversion component, a communication module, a detection module or an interactive module, etc. For example, in some embodiments, the electronic device 14 is a power conversion component.

[0069] like Figure 1-Figure 7 As shown, the eight-way valve 19 is connected between the second path of the condenser 112, the second path of the first evaporator 114, the first flow path 13 and the second flow path 15, and the eight valve ports of the eight-way valve 19 can be selectively opened and closed.

[0070] The eight-way valve 19 is used to selectively connect or disconnect the second path of the condenser 112 , the second path of the first evaporator 114 , the first flow path 13 , and the second flow path 15 .

[0071] In actual implementation, Figure 2-Figure 7As shown, the energy storage system 10 can be configured with a variety of thermal management modes. In each thermal management mode, the temperature control methods for the energy storage battery 12 and the electronic device 14 are different. The various thermal management modes may include but are not limited to: First, in the independent dehumidification mode, the energy storage battery 12 does not perform thermal management, the first radiator 152 can dissipate heat for the electronic device 14 and the condenser 112, the second branch is connected to the compressor 111, and the water vapor in the air condenses into water and adheres to the surface of the second evaporator 115, and the condensed water is collected to complete the dehumidification process; second, in the active cooling mode, the first evaporator 114 can cool the energy storage battery 1 2 for heat dissipation, and the first radiator 152 can dissipate heat for the electronic device 14 and the condenser 112 at the same time; third, in the natural cooling mode, the first radiator 152 can dissipate heat for the energy storage battery 12 and the electronic device 14; fourth, in the heat pump combined heating mode, the condenser 112 can heat the energy storage battery 12, and the waste heat of the electronic device heats the first evaporator; fifth, in the waste heat combined heating mode, the waste heat of the electronic device 14 can heat the energy storage battery 12; sixth, in the active temperature equalization mode, the coolant in the first flow path 13 is driven to circulate to promote the internal temperature equalization of the energy storage battery 12.

[0072] It should be noted that in the active cooling mode and the heat pump combined heating mode, since the compressor 111 is in working condition, both the first branch and the second branch can be connected to the compressor 111. Therefore, for the energy storage system 10, in addition to being able to perform the dehumidification function in the above-mentioned independent dehumidification mode, it can also take into account the thermal management needs and dehumidification needs in the active cooling mode and the heat pump combined heating mode.

[0073] The energy storage system 10 provided in the embodiment of the present application can realize the independent dehumidification function of the energy storage system 10 by setting the above-mentioned first branch and second branch connected in parallel, controlling the on-off state between the compressor 111 and the first branch and the second branch, and maximally optimizing the dehumidification effect, maintaining the efficient operation of the energy storage battery 12 and the electronic device 14. At the same time, part of the refrigerant can be extracted for synchronous dehumidification in a specific thermal management mode, taking into account the thermal management requirements of the energy storage battery 12 and the dehumidification requirements of the energy storage system 10, thereby increasing the practicality and usage width of the entire energy storage system 10, and adopting the eight-way valve 19 to integrate the thermal management flow path, reduce the volume of the liquid cooling unit, and improve the space utilization rate of the energy storage system 10. At the same time, multiple thermal management modes are realized, the comprehensive use performance is improved, and the precise temperature control and humidity management are used to effectively prevent safety hazards and failure problems caused by overheating and overhumidity, thereby improving the overall reliability and safety of the energy storage system 10.

[0074] In some embodiments, Figure 1-Figure 7As shown, the first branch also includes a first expansion valve 113, which is connected between the first path of the condenser 112 and the first path of the first evaporator 114, and the second branch also includes a second expansion valve 116, which is connected between the first path of the condenser 112 and the second evaporator 115.

[0075] In this embodiment, if Figure 1-Figure 7 As shown, the first branch includes a first expansion valve 113 and a first evaporator 114 connected in series, and the first expansion valve 113 can independently control the on-off of the first branch, and the first expansion valve 113 can independently control the pressure and flow of the refrigerant flowing from the condenser 112 to the first evaporator 114; the second branch includes a second expansion valve 116 and a second evaporator 115 connected in series, and the second expansion valve 116 can independently control the on-off of the second branch, and the second expansion valve 116 can independently control the pressure and flow of the refrigerant flowing from the condenser 112 to the second evaporator 115.

[0076] In other embodiments, the first branch and the second branch share a common expansion valve. In this case, the independent dehumidification mode cannot be implemented.

[0077] In some other embodiments, the first branch further includes an expansion valve, and the second branch further includes a switch valve. In this case, the refrigerant pressure and flow rate of the second branch cannot be controlled.

[0078] The energy storage system 10 provided in the embodiment of the present application can independently control the refrigerant flow of the first branch and the second branch through the configuration of the above-mentioned first expansion valve 113 and the second expansion valve 116 to meet different refrigeration needs or dehumidification needs, and at the same time more flexibly adjust the distribution of the refrigerant to meet the needs of different thermal management modes, support multi-mode efficient operation, optimize the thermal management efficiency of the entire energy storage system 10, and be able to more conveniently locate and handle problems during maintenance. If the expansion valve of a branch fails, it can be replaced separately without affecting the operation of the entire energy storage system 10.

[0079] In some embodiments, the refrigeration circuit 11 further includes: a first valve 118 and a subcooling branch.

[0080] like Figure 1-Figure 7 As shown, the first valve 118 is connected in series between the condenser 112 and the first expansion valve 113 ; the subcooling branch is connected in parallel with the first valve 118 , and the subcooling branch includes a second radiator 117 and a second valve 119 .

[0081] In this embodiment, if Figure 1-Figure 7As shown, the first valve 118 can be a normally closed solenoid valve, and the second valve 119 can be a one-way valve, which only allows the refrigerant to flow from the condenser 112 to the second radiator 117. Specifically, the normally closed solenoid valve is not working, that is, it is in a closed state, and the refrigerant flows through the one-way valve and the second radiator 117; the normally closed solenoid valve is working, that is, it is in an open state, and the refrigerant flows to the branch where the normally closed solenoid valve is located. Due to the unidirectional conduction effect of the one-way valve, the refrigerant after flowing through the normally closed solenoid valve cannot flow back to the subcooling branch, and since part of the refrigerant will remain in the pipe of the subcooling branch, a liquid seal effect is formed, resulting in the refrigerant coming out of the condenser 112 being unable to flow into the subcooling branch.

[0082] In other embodiments, both the first valve 118 and the second valve 119 may be switch valves.

[0083] In actual implementation, Figure 1-Figure 7 As shown, in the active refrigeration mode, the gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant by the compressor 111, and the high-temperature and high-pressure gaseous refrigerant then flows through the first path of the condenser 112 for the first heat release and liquefaction to become a medium-temperature and high-pressure liquid refrigerant. The medium-temperature and high-pressure liquid refrigerant then passes through the second radiator 117 for the second heat release and cooling to become a low-temperature and high-pressure liquid refrigerant. The low-temperature and high-pressure liquid refrigerant passes through the first expansion valve 113 to become a low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant flows through the first path of the first evaporator 114, and the low-temperature liquid refrigerant absorbs heat in the first evaporator 114 and vaporizes into a high-temperature gaseous refrigerant.

[0084] The energy storage system 10 provided in the embodiment of the present application adopts a supercooling design in the active cooling mode through the configuration of the second radiator 117, the first valve 118 and the second valve 119. The second radiator 117 can supercool the saturated refrigerant, thereby improving the supercooling degree of the refrigerant, improving the cooling capacity and cooling performance, and thus meeting the heat dissipation requirements of the energy storage battery 12 in an extremely high temperature environment.

[0085] In some embodiments, Figure 1-Figure 7 As shown, the energy storage system 10 also includes a heat dissipation fan 18 .

[0086] The energy storage system 10 forms a heat dissipation duct, and the heat dissipation fan 18 is used to drive the air flow in the heat dissipation duct. The heat dissipation duct is connected to the gas flow channel of the first radiator 152 and the gas flow channel of the second radiator 117, and the gas flow channel of the first radiator 152 is arranged toward the gas flow channel of the second radiator 117.

[0087] Among them, one or more heat dissipation fans 18 can be provided, and more than two means two or more.

[0088] For example, in some embodiments, Figure 1-Figure 7 As shown, one heat dissipation fan 18 is provided.

[0089] In the related art, the first radiator and the second radiator are usually arranged independently, and the first radiator and the second radiator each independently exchange heat with the external environment through a fan. However, the use of this solution causes the heat exchange efficiency of the first radiator and the second radiator to fall short of expectations, and the number of fans and energy consumption cannot be effectively controlled.

[0090] In actual implementation, Figure 1-Figure 7 As shown, the heat dissipation fan 18 rotates to drive the air flow in the heat dissipation duct to flow rapidly. The air flow can flow through the gas flow channel of the first radiator 152, the gas flow channel of the second radiator 117, the heat dissipation duct and the heat dissipation fan 18, thereby taking away the heat carried by the first radiator 152, thereby achieving further forced air cooling and heat dissipation of the coolant, and taking away the heat carried by the second radiator 117, thereby achieving forced air cooling and heat dissipation of the refrigerant.

[0091] The energy storage system 10 provided in the embodiment of the present application is designed to cool the first radiator 152 and the second radiator 117 by using a common heat dissipation fan 18, thereby reducing the number of required fans and achieving the most concise and efficient air duct structure while controlling production costs. At the same time, the smoothness and orderliness of the air duct are improved, and the heat dissipation efficiency of the first radiator 152 and the second radiator 117 is improved, thereby improving the energy efficiency ratio of the entire energy storage system 10.

[0092] In some embodiments, Figure 1-Figure 7 As shown, the first valve port A1 of the eight-way valve 19 is connected to the inlet of the second path of the first evaporator 114, the second valve port A2 of the eight-way valve 19 is connected to the inlet of the second flow path 15, the third valve port A3 of the eight-way valve 19 is connected to the outlet of the first flow path 13, the fourth valve port A4 of the eight-way valve 19 is connected to the inlet of the second path of the condenser 112, the fifth valve port A5 of the eight-way valve 19 is connected to the outlet of the second path 15, the sixth valve port A6 of the eight-way valve 19 is connected to the outlet of the second path of the first evaporator 114, the seventh valve port A7 of the eight-way valve 19 is connected to the inlet of the first flow path 13, and the eighth valve port A8 of the eight-way valve 19 is connected to the outlet of the second path of the condenser 112.

[0093] In this embodiment, if Figure 1-Figure 7 As shown, the first to eighth valve ports can be respectively connected to the inlet and outlet of the second path of the first evaporator 114, the inlet and outlet of the first flow path 13, the inlet and outlet of the second flow path 15, and the inlet and outlet of the second path of the condenser 112. By changing the connectivity between the first to eighth valve ports, the connectivity between the first flow path 13, the second flow path 15, the second path of the first evaporator 114, and the second path of the condenser 112 can be changed to realize multiple thermal management modes of the energy storage system 10.

[0094] The energy storage system 10 provided in the embodiment of the present application realizes the on-off relationship of each passage controlled by eight valve ports through the design of the connection relationship between each valve port of the eight-way valve 19 and each component, thereby realizing the switching between various complex thermal management modes and improving the integration of water-side components, so that the water-side pipelines are all concentrated at the eight-way valve 19, and the space occupied by the liquid cooling unit is reduced as much as possible, thereby significantly improving the energy density of the entire energy storage system 10 and realizing overall miniaturization and lightweight design.

[0095] In some embodiments, Figure 1-Figure 7 As shown, the energy storage system 10 also includes a water tank 16 .

[0096] like Figure 1-Figure 7 As shown, the water tank 16 is connected to the seventh valve port A7 of the eight-way valve 19 .

[0097] In this embodiment, if Figure 1-Figure 7 As shown, the water tank 16 can be connected to the inlet of the first flow path 13, the exhaust pipe of the water tank 16 can be connected to the outlet of the first flow path 13, and the exhaust pipe of the water tank 16 can be connected to the high point position of the outlet of the first flow path 13 to speed up the exhaust speed of the water tank 16.

[0098] The energy storage system 10 provided in the embodiment of the present application realizes water path connection and gas path connection between the water tank 16 and the first flow path 13 through the arrangement of the water tank 16, shortens the water supply path of the water tank 16, improves the water supply efficiency, thereby speeding up the water circulation rate, and further optimizing the heat dissipation effect of the energy storage battery 12, while speeding up the exhaust speed of the water tank 16, preventing the gas from blocking the circulation of the cooling water, and optimizing the cooling effect of the water circulation.

[0099] In some embodiments, Figure 1-Figure 7 As shown, the energy storage system 10 further includes a heater 17 .

[0100] The heater 17 is connected between the eighth valve port A8 of the eight-way valve 19 and the outlet of the second path of the condenser 112 .

[0101] In actual implementation, in the heat pump combined heating mode, when the heat provided by the heat pump is insufficient to meet the demand, the heater 17 is turned on, and the condenser 112 can heat the energy storage battery 12 together with the heater 17, and the first radiator 152 can dissipate heat for the condenser 112 of the electronic device 14; in the waste heat combined heating mode, when the heat provided by the electronic device 14 is insufficient to meet the demand, the heater 17 is turned on, and the electronic device 14 can heat the energy storage battery 12 together with the heater 17. When the heat provided by the electronic device 14 and the heater 17 is still insufficient to meet the demand, the heat pump is turned on, and the electronic device 14, the heater 17 and the condenser 112 heat the energy storage battery 12 together.

[0102] It should be noted that in the waste heat combined heating mode, since the heat pump needs to be turned on in some stages of this mode, in this stage, since the compressor 111 is also in working condition, both the first branch and the second branch can be connected to the compressor 111. In this way, a part of the refrigerant in the refrigeration circuit 11 can enter the first branch to achieve refrigeration, and the other part of the refrigerant can enter the second branch to achieve dehumidification. Therefore, for the energy storage system 10, in addition to the dehumidification function in the above-mentioned independent dehumidification mode, it can also take into account the thermal management needs and dehumidification needs in some stages of the active refrigeration mode, the heat pump combined heating mode and the waste heat combined heating mode.

[0103] The energy storage system 10 provided in the embodiment of the present application, through the configuration of the above-mentioned heater 17, enables the system to provide a variety of heating schemes for selection, such as heat pump heating, heating with waste heat from the electronic device 14, heating with the heater 17, or a combination of at least two of the above. Different heating schemes are selected according to actual heat demand, thereby increasing the maximum total heat supply of the entire heating system, enhancing the adaptability of the energy storage system 10 in extremely cold weather, and refining the heating mode.

[0104] In some embodiments, Figure 2 As shown, the energy storage system 10 has a first working mode. In the first working mode, the compressor 111, the condenser 112, the first radiator 152, the second evaporator 115 and the second pump 151 are working, and the first pump 131 and the first evaporator 114 are not working; the second branch is connected to the compressor 111, and the second flow path 15 and the second path of the condenser 112 are connected end to end.

[0105] In this embodiment, if Figure 2As shown, the first working mode is the above-mentioned independent dehumidification mode. When the energy storage system 10 switches to the first working mode, the first expansion valve 113 is closed, the second expansion valve 116 is opened, and the on-off state of each valve port of the eight-way valve 19 is: the second valve port A2 of the eight-way valve 19 is connected to the fourth valve port A4 of the eight-way valve 19, and the fifth valve port A5 of the eight-way valve 19 is connected to the eighth valve port A8 of the eight-way valve 19. In the case where the energy storage system 10 includes the second radiator 117 and the heater 17, the second radiator 117 works and the heater 17 does not work.

[0106] The energy storage system 10 provided in the embodiment of the present application, through the design of the above-mentioned first working mode, in this mode the system focuses on the dehumidification function, and the second evaporator 115, as a dedicated dehumidification element, absorbs moisture in the surrounding environment and condenses it into liquid water for discharge, thereby effectively reducing the ambient humidity. Since the first evaporator 114 does not participate in the work, the system can concentrate resources on the dehumidification task and improve the dehumidification efficiency, so that the energy storage system 10 can adapt to a wider range of environmental conditions, especially in high humidity environments. This is particularly important for some application scenarios with high humidity requirements, and by turning off the first pump 131 and the first evaporator 114, unnecessary energy consumption is reduced. In the use scenario where only dehumidification is required and no thermal management of the energy storage battery 12 is required, this design reduces energy waste and improves the overall energy efficiency of the energy storage system 10.

[0107] In some embodiments, Figure 3 As shown, the energy storage system 10 has a second working mode. In the second working mode, the compressor 111, the condenser 112, the first evaporator 114, the first radiator 152, the first pump 131 and the second pump 151 are working; the first flow path 13 and the second path of the first evaporator 114 are connected end to end, and the second flow path 15 and the second path of the condenser 112 are connected end to end.

[0108] In this embodiment, if Figure 3 As shown, the second working mode is the above-mentioned active cooling mode. When the energy storage system 10 switches to the second working mode, the first expansion valve 113 is opened, and the second expansion valve 116 is controlled to open and close according to actual needs. The on-off state of each valve port of the eight-way valve 19 is: the first valve port A1 of the eight-way valve 19 is connected to the third valve port A3 of the eight-way valve 19, the second valve port A2 of the eight-way valve 19 is connected to the fourth valve port A4 of the eight-way valve 19, the fifth valve port A5 of the eight-way valve 19 is connected to the eighth valve port A8 of the eight-way valve 19, and the sixth valve port A6 of the eight-way valve 19 is connected to the seventh valve port A7 of the eight-way valve 19. In the case where the energy storage system 10 includes the second radiator 117 and the heater 17, the second radiator 117 and the heater 17 are not working.

[0109] The energy storage system 10 provided in the embodiment of the present application, through the design of the above-mentioned second working mode, realizes that when the temperature of the energy storage battery 12 is too high, the refrigeration circuit 11 is used to perform fluorine cooling on the energy storage battery 12, and the first radiator 152 is used to dissipate heat for the electronic device 14 and the condenser 112, taking into account the heat dissipation requirements of the energy storage battery 12, the electronic device 14 and the condenser 112, and alleviating a series of domino effects of thermal runaway of the energy storage battery 12 due to overheating, thereby extending the working life of the energy storage battery 12. In addition, the second radiator 117 can supercool the saturated refrigerant, thereby improving the supercooling degree of the refrigerant, improving the cooling capacity and refrigeration performance, and thereby increasing the use width of the energy storage system 10.

[0110] In some embodiments, Figure 4 As shown, the energy storage system 10 has a third working mode. In the third working mode, the first radiator 152, the first pump 131 and the second pump 151 are working, and the compressor 111, the condenser 112, the first evaporator 114 and the second evaporator 115 are not working; the first flow path 13, the second path of the condenser 112, the second flow path 15 and the second path of the first evaporator 114 are connected end to end in sequence.

[0111] In this embodiment, if Figure 4 As shown, the third working mode is the above-mentioned natural cooling mode. When the energy storage system 10 switches to the third working mode, the on-off state of each valve port of the eight-way valve 19 is: the first valve port A1 of the eight-way valve 19 is connected to the second valve port A2 of the eight-way valve 19, the third valve port A3 of the eight-way valve 19 is connected to the fourth valve port A4 of the eight-way valve 19, the fifth valve port A5 of the eight-way valve 19 is connected to the eighth valve port A8 of the eight-way valve 19, and the sixth valve port A6 of the eight-way valve 19 is connected to the seventh valve port A7 of the eight-way valve 19. In the case where the energy storage system 10 includes the second radiator 117 and the heater 17, the second radiator 117 and the heater 17 are not working.

[0112] The energy storage system 10 provided in the embodiment of the present application, through the design of the third working mode, realizes that when the temperature of the energy storage battery 12 is high, the energy storage battery 12 and the electronic device 14 are cooled by air using the first radiator 152, thereby meeting the basic heat dissipation demand of the energy storage battery 12 and preventing the refrigeration circuit 11 from being started as soon as the temperature of the energy storage battery 12 rises slightly, thereby causing unnecessary energy consumption, thereby improving the operating energy efficiency of the entire energy storage system 10 without affecting the performance of the energy storage battery 12 itself.

[0113] In some embodiments, Figure 5As shown, the energy storage system 10 has a fourth working mode. In the fourth working mode, the first flow path 13 and the second path of the condenser 112 are connected end to end, and the second flow path 15 and the second path of the first evaporator 114 are connected end to end. The fourth working mode includes a first heating stage and a second heating stage. In the first heating stage, the compressor 111, the condenser 112, the first evaporator 114, the first pump 131, the second pump 151 work, and the heater 17 and the first radiator 152 do not work; in the second heating stage, the compressor 111, the condenser 112, the first evaporator 114, the first pump 131, the second pump 151 and the heater 17 work, and the first radiator 152 does not work.

[0114] In this embodiment, if Figure 5 As shown, the fourth working mode is the above-mentioned heat pump combined heating mode. When the energy storage system 10 switches to the fourth working mode, the first expansion valve 113 is opened, and the second expansion valve 116 is controlled to open and close according to actual needs. The on-off state of each valve port of the eight-way valve 19 is: the first valve port A1 of the eight-way valve 19 is connected to the second valve port A2 of the eight-way valve 19, the third valve port A3 of the eight-way valve 19 is connected to the fourth valve port A4 of the eight-way valve 19, the fifth valve port A5 of the eight-way valve 19 is connected to the sixth valve port A6 of the eight-way valve 19, and the seventh valve port A7 of the eight-way valve 19 is connected to the eighth valve port A8 of the eight-way valve 19. In the case where the energy storage system 10 includes the second radiator 117 and the heater 17, the second radiator 117 does not work in the first heating stage and the second heating stage, the heater 17 does not work in the first heating stage, and the heater 17 works in the second heating stage.

[0115] The energy storage system 10 provided in the embodiment of the present application, through the design of the above-mentioned fourth working mode, realizes that when the temperature of the energy storage battery 12 is too low, the system first switches to the first heating stage to use the condenser 112 of the refrigeration circuit 11 to heat the energy storage battery 12, so that the energy storage battery 12 can work normally in a low temperature environment. When a higher heating power is required or the external ambient temperature is extremely low, the system can switch to the second heating stage, so that the heater 17 is activated to join the work, and cooperates with the original thermal cycle system to provide additional heat output. This design enables the energy storage system 10 to flexibly respond to different heating needs and environmental conditions, and maintains the stability and reliability of the heating effect. At the same time, by dividing the heating process into two stages, the system can select the most appropriate working mode according to the actual situation, avoiding problems such as overheating and overload that may occur in a single mode, and improving the stability and reliability of the system.

[0116] In some embodiments, Figure 8As shown, when the temperature of the energy storage battery 12 is lower than the first target threshold and the electronic device 14 is in a shutdown state, the energy storage system 10 switches to the first heating stage of the fourth working mode; after the first heating stage continues to run for a target time, when the temperature of the energy storage battery 12 is still lower than the first target threshold, the energy storage system 10 switches to the second heating stage of the fourth working mode.

[0117] The first target threshold may be close to the lower limit of the suitable operating temperature range of the energy storage battery 12 . When the temperature of the energy storage battery 12 is lower than the first target threshold, the energy storage system 10 considers that it is necessary to start the corresponding heating mode to prevent the performance of the energy storage battery 12 from being degraded or damaged.

[0118] The second target threshold may be close to the upper limit of the suitable operating temperature range of the energy storage battery 12. When the temperature of the energy storage battery 12 is still lower than the first target threshold but reaches or exceeds the second target threshold, the energy storage system 10 may consider adjusting the heating strategy or maintaining the current heating mode until the temperature of the energy storage battery 12 rises further.

[0119] The target duration is used to evaluate the heating effect and decide whether it is necessary to switch to a higher intensity heating mode. When actually determining the target duration, factors such as the efficiency of the refrigeration circuit 11, the heat capacity of the energy storage battery 12, and the ambient temperature need to be considered.

[0120] For example, the target duration may be set to range from 1 minute to 10 minutes, which is not limited here.

[0121] The energy storage system 10 may further include a controller, which may be electrically connected to a battery management system of the energy storage battery 12 and the electronic device 14 , so as to obtain temperature information of the energy storage battery 12 and operating information of the electronic device 14 .

[0122] In actual implementation, Figure 8As shown, the controller can compare the acquired temperature of the energy storage battery 12 with the set first target threshold. When the temperature of the energy storage battery 12 is not less than the first target threshold, the energy storage system 10 does not switch to any heating mode. When the temperature of the energy storage battery 12 is less than the first target threshold, the controller can analyze the acquired operation information of the electronic device 14. When the electronic device 14 is in a non-working state, the controller controls the energy storage system 10 to directly switch to the first heating stage. After the first heating stage continues to run for a target time, the controller can again compare the acquired temperature of the energy storage battery 12 with the set first target threshold. When the temperature of the energy storage battery 12 is not less than the first target threshold, the controller controls the energy storage system 10 to switch to the first heating stage directly. When the temperature of the energy storage battery 12 exceeds the first target threshold, the controller compares the acquired temperature of the energy storage battery 12 with the set second target threshold. When the temperature of the energy storage battery 12 is greater than the set second target threshold, the energy storage system 10 stops running the first heating stage. When the temperature of the energy storage battery 12 is not greater than the set second target threshold, the energy storage system 10 keeps running the current first heating stage. When the temperature of the energy storage battery 12 is still less than the first target threshold, the controller controls the energy storage system 10 to switch to the second heating stage. The second heating stage continues to run until the temperature of the energy storage battery 12 exceeds the first target threshold, at which time the controller controls the energy storage system 10 to switch back to the first heating stage.

[0123] The energy storage system 10 provided in the embodiment of the present application, through the switching logic design between the first heating stage and the second heating stage of the fourth working mode, when the temperature of the energy storage battery 12 is too low and the electronic device 14 is shut down, the fourth working mode is started in time, so that the energy storage battery 12 operates within a suitable temperature range, thereby extending the service life of the energy storage battery 12; at the same time, it can be flexibly adjusted according to the actual temperature of the energy storage battery 12. The first heating stage adopts a relatively mild heating method to prevent the rapid rise in temperature from causing an impact on the energy storage battery 12. If the temperature of the energy storage battery 12 still does not reach the ideal range after the first heating stage, the second heating stage is entered, and a stronger heating measure is adopted until the temperature of the energy storage battery 12 returns to a safe range. This staged control strategy helps to achieve more accurate temperature management; and by real-time monitoring of the temperature of the energy storage battery 12 and the operating status of the electronic device 14, the system automatically determines whether it is necessary to start the fourth working mode and when to adjust the heating stage. This intelligent judgment mechanism enables the energy storage system 10 to self-regulate according to different environmental conditions and usage requirements, thereby improving the adaptability and reliability of the energy storage system 10.

[0124] In some embodiments, Figure 6As shown, the energy storage system 10 has a fifth working mode. In the fifth working mode, the first flow path 13, the second path of the condenser 112, the second flow path 15 and the second path of the first evaporator 114 are connected end to end in sequence, and the fifth working mode includes a first heating stage, a second heating stage and a third heating stage; wherein, in the first heating stage, the first pump 131 and the second pump 151 work, the compressor 111, the condenser 112, the first evaporator 114, the first radiator 152 and the heater 17 do not work, and the heater 17 does not work; in the second heating stage, the compressor 111, the condenser 112, the first evaporator 114, the first pump 131 and the second pump 151 work, and the first radiator 152 and the heater 17 do not work; in the third heating stage, the compressor 111, the condenser 112, the first evaporator 114, the first pump 131, the second pump 151 and the heater 17 work, and the first radiator 152 does not work.

[0125] In this embodiment, if Figure 6 As shown, the fifth working mode is the above-mentioned waste heat combined heating mode. When the energy storage system 10 switches to the fifth working mode, in the third heating stage, the first expansion valve 113 is opened, and the second expansion valve 116 is controlled to open and close according to actual needs. The on-off state of each valve port of the eight-way valve 19 is: the first valve port A1 of the eight-way valve 19 is connected to the second valve port A2 of the eight-way valve 19, the third valve port A3 of the eight-way valve 19 is connected to the fourth valve port A4 of the eight-way valve 19, the fifth valve port A5 of the eight-way valve 19 is connected to the eighth valve port A8 of the eight-way valve 19, and the sixth valve port A6 of the eight-way valve 19 is connected to the seventh valve port A7 of the eight-way valve 19. In the case where the energy storage system 10 includes the second radiator 117 and the heater 17, the second radiator 117 does not work in the first heating stage, the second heating stage and the third heating stage, the heater 17 does not work in the first heating stage, and the heater 17 works in the second heating stage and the third heating stage.

[0126] The energy storage system 10 provided in the embodiment of the present application, through the design of the fifth working mode, utilizes the waste heat of the electronic device 14 to heat the energy storage battery 12 in a low temperature environment, thereby minimizing the loss of waste heat and significantly improving the energy utilization efficiency. At the same time, the quality of energy is fully considered. The waste heat of the electronic device 14 can be firstly recovered to heat the energy storage battery 12, and the heat pump heating is turned on when the heat is insufficient. Finally, the heater 17 is used for heating, thereby achieving the cascade utilization of energy and realizing energy saving. In addition, the operating status of each component is adjusted according to specific needs in each heating stage, thereby realizing the flexibility of system operation. This staged control can be optimized according to conditions such as ambient temperature and equipment load to maximize the utilization of waste heat.

[0127] In some embodiments, Figure 8As shown, when the temperature of the energy storage battery 12 is lower than the first target threshold and the electronic device 14 is in working condition, the energy storage system 10 switches to the first heating stage of the fifth working mode; after the first heating stage continues to run for the target time, when the temperature of the energy storage battery 12 is still lower than the first target threshold, the energy storage system 10 switches to the second heating stage of the fifth working mode; after the second heating stage continues to run for the target time, when the temperature of the energy storage battery 12 is still lower than the first target threshold, the energy storage system 10 switches to the third heating stage of the fifth working mode.

[0128] The first target threshold may be close to the lower limit of the suitable operating temperature range of the energy storage battery 12 . When the temperature of the energy storage battery 12 is lower than the first target threshold, the energy storage system 10 considers that it is necessary to start the corresponding heating mode to prevent the performance of the energy storage battery 12 from being degraded or damaged.

[0129] The second target threshold may be close to the upper limit of the suitable operating temperature range of the energy storage battery 12. When the temperature of the energy storage battery 12 is still lower than the first target threshold but reaches or exceeds the second target threshold, the energy storage system 10 may consider adjusting the heating strategy or maintaining the current heating mode until the temperature of the energy storage battery 12 rises further.

[0130] The target duration is used to evaluate the heating effect and decide whether it is necessary to switch to a higher intensity heating mode. When actually determining the target duration, factors such as the efficiency of the refrigeration circuit 11, the heat capacity of the energy storage battery 12, and the ambient temperature need to be considered.

[0131] For example, the target duration may be set to range from 1 minute to 10 minutes, which is not limited here.

[0132] The energy storage system 10 may further include a controller, which may be electrically connected to a battery management system of the energy storage battery 12 and the electronic device 14 , so as to obtain temperature information of the energy storage battery 12 and operating information of the electronic device 14 .

[0133] In actual implementation, Figure 8As shown, the controller can compare the acquired temperature of the energy storage battery 12 with the set first target threshold. When the temperature of the energy storage battery 12 is not less than the first target threshold, the energy storage system 10 does not switch to any heating mode. When the temperature of the energy storage battery 12 is less than the first target threshold, the controller can analyze the acquired operation information of the electronic device 14. When the electronic device 14 is in working state, the controller controls the energy storage system 10 to directly switch to the first heating stage. After the first heating stage continues to run for the target time, the controller can again compare the acquired temperature of the energy storage battery 12 with the set first target threshold. When the temperature of the energy storage battery 12 is not less than the first target threshold, the controller compares the acquired temperature of the energy storage battery 12 with the set second target threshold. When the temperature of the energy storage battery 12 is greater than the set second target threshold, the energy storage system 10 stops running the first heating stage. When the temperature of the energy storage battery 12 is not greater than the set second target threshold, the energy storage system 10 keeps running the current The first heating stage; when the temperature of the energy storage battery 12 is still less than the first target threshold, the controller controls the energy storage system 10 to switch to the second heating stage. After the second heating stage continues to run for the target time, the controller can again compare the temperature of the energy storage battery 12 obtained at this time with the set first target threshold. When the temperature of the energy storage battery 12 is not less than the first target threshold, the controller again compares the temperature of the energy storage battery 12 obtained at this time with the set second target threshold. When the temperature of the energy storage battery 12 is greater than the set second target threshold, the energy storage system 10 switches back to the first heating stage. When the temperature of the energy storage battery 12 is not greater than the set second target threshold, the energy storage system 10 keeps running the current second heating stage. When the temperature of the energy storage battery 12 is still less than the first target threshold, the controller controls the energy storage system 10 to switch to the third heating stage. The third heating stage continues to run until the temperature of the energy storage battery 12 is greater than the first target threshold, and the controller controls the energy storage system 10 to switch back to the second heating stage.

[0134] The energy storage system 10 provided in the embodiment of the present application, through the switching logic design between the first heating stage, the second heating stage and the third heating stage of the above-mentioned fifth working mode, when the temperature of the energy storage battery 12 is too low and the electronic device 14 is working, the fifth working mode is started in time, so that the energy storage battery 12 operates within a suitable temperature range, thereby extending the service life of the energy storage battery 12 and minimizing the loss of waste heat. The staged control strategy helps to achieve more accurate temperature management; and by real-time monitoring of the temperature of the energy storage battery 12 and the operating status of the electronic device 14, the system automatically determines whether it is necessary to start the fifth working mode and when to adjust the heating stage. This intelligent judgment mechanism enables the energy storage system 10 to self-regulate according to different environmental conditions and usage requirements, thereby improving the adaptability and reliability of the energy storage system 10.

[0135] In some embodiments, Figure 7 As shown, the energy storage system 10 has a sixth working mode. In the sixth working mode, the first pump 131 is working, and the compressor 111, the condenser 112, the first evaporator 114, the second evaporator 115, the first radiator 152 and the second pump 151 are not working; the first flow path 13 and the second path of the first evaporator 114 are connected end to end.

[0136] In this embodiment, if Figure 7 As shown, the sixth working mode is the above-mentioned active temperature equalization mode. When the energy storage system 10 switches to the sixth working mode, the on-off state of each valve port of the eight-way valve 19 is: the first valve port A1 of the eight-way valve 19 is connected to the third valve port A3 of the eight-way valve 19, and the sixth valve port A6 of the eight-way valve 19 is connected to the seventh valve port A7 of the eight-way valve 19. In the case where the energy storage system 10 includes the second radiator 117 and the heater 17, the second radiator 117 and the heater 17 are not working.

[0137] The energy storage system 10 provided in the embodiment of the present application, through the design of the sixth working mode, utilizes the circulation of coolant to achieve uniform distribution of temperature in the energy storage system 10. The first pump 131 drives the liquid to circulate in the first flow path 13 and the second path of the first evaporator 114, which can effectively transfer heat from the high-temperature area to the low-temperature area, and improve the uniformity of the temperature of multiple battery cells in the energy storage battery 12, thereby maintaining the temperature balance in the energy storage system 10, improving the energy storage efficiency and service life. At the same time, since the operation of high-energy consumption components is reduced in this mode, the wear and failure rate of the system are reduced, thereby reducing maintenance costs. In addition, by maintaining the temperature balance in the energy storage system 10, it is also helpful to reduce the performance degradation and failure risks caused by temperature fluctuations.

[0138] The application also discloses a photovoltaic energy storage system.

[0139] In some embodiments, the photovoltaic energy storage system includes: a photovoltaic power generation system and an energy storage system 10 as any one of the above.

[0140] The photovoltaic power generation system is used to supply power to the energy storage system 10 .

[0141] The photovoltaic power generation system may include photovoltaic modules and inverter units. The energy storage battery 12 in the energy storage system 10 may be connected to the direct current output by the photovoltaic modules, and other power modules in the energy storage system 10 may be connected to the alternating current output by the inverter unit.

[0142] The photovoltaic energy storage system provided in the embodiment of the present application can realize the independent dehumidification function of the energy storage system 10 through the setting of the above-mentioned energy storage system 10, maximize the dehumidification effect, and can also extract part of the refrigerant for synchronous dehumidification in a specific thermal management mode, taking into account the thermal management requirements of the energy storage battery 12 and the dehumidification requirements of the energy storage system 10, thereby increasing the practicality and usage width of the entire energy storage system 10, and adopting the eight-way valve 19 to integrate the thermal management flow path, reduce the volume of the liquid cooling unit, and improve the space utilization rate of the energy storage system 10. At the same time, multiple thermal management modes are realized to improve the comprehensive use performance, and precise temperature control and humidity management are used to effectively prevent safety hazards and failure problems caused by overheating and overhumidity, thereby improving the overall reliability and safety of the energy storage system 10.

[0143] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0144] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "inside", "outside", etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0145] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0146] In the description of the present application, “plurality” means two or more.

[0147] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0148] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0149] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0150] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An energy storage system, It is characterized in that include: A refrigeration circuit, the refrigeration circuit includes a compressor, a first path of a condenser and an evaporator flow path, the evaporator flow path includes a first branch and a second branch connected in parallel, the first branch includes a first path of a first evaporator, the second branch includes a second evaporator, the second evaporator is used for dehumidification, and at least one of the first branch and the second branch can be selectively connected to the compressor; An energy storage battery and a first flow path, wherein a heat exchange portion of the energy storage battery is connected to the first flow path, and the first flow path includes a first pump; An electronic device and a second flow path, wherein a heat exchange portion of the electronic device is connected to the second flow path, and the second flow path includes a second pump and a first radiator; An eight-way valve is connected to the second path of the condenser, the second path of the first evaporator, the first flow path and the second flow path, and the eight valve ports of the eight-way valve can be selectively opened and closed.

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

3. The energy storage system according to claim 2, It is characterized in that The refrigeration circuit also includes: a first valve connected in series between the condenser and the first expansion valve; A supercooling branch is connected in parallel with the first valve and includes a second radiator and a second valve.

4. The energy storage system according to claim 3, It is characterized in that Also includes: A heat dissipation fan, the energy storage system forms a heat dissipation duct, the heat dissipation fan is used to drive the air flow in the heat dissipation duct, the heat dissipation duct is connected to the gas flow channel of the first radiator and the gas flow channel of the second radiator, and the gas flow channel of the first radiator is arranged toward the gas flow channel of the second radiator.

5. The energy storage system according to claim 1, It is characterized in that The first valve port of the eight-way valve is connected to the inlet of the second path of the first evaporator, the second valve port of the eight-way valve is connected to the inlet of the second flow path, the third valve port of the eight-way valve is connected to the outlet of the first flow path, the fourth valve port of the eight-way valve is connected to the inlet of the second path of the condenser, the fifth valve port of the eight-way valve is connected to the outlet of the second path, the sixth valve port of the eight-way valve is connected to the outlet of the second path of the first evaporator, the seventh valve port of the eight-way valve is connected to the inlet of the first flow path, and the eighth valve port of the eight-way valve is connected to the outlet of the second path of the condenser.

6. The energy storage system according to claim 5, It is characterized in that Also includes: A water tank is connected to the seventh valve port of the eight-way valve.

7. The energy storage system according to claim 5, It is characterized in that Also includes: A heater is connected between the eighth valve port of the eight-way valve and the outlet of the second path of the condenser.

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

9. The energy storage system according to any one of claims 1 to 7, It is characterized in that The energy storage system has a second working mode, in which the compressor, the condenser, the first evaporator, the first radiator, the first pump and the second pump are in operation; The first flow path is connected end to end with the second path of the first evaporator, and the second flow path is connected end to end with the second path of the condenser.

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

11. The energy storage system according to claim 7, It is characterized in that The energy storage system has a fourth working mode, in which the first flow path and the second flow path of the condenser are connected end to end, and the second flow path and the second flow path of the first evaporator are connected end to end, and the fourth working mode includes a first heating stage and a second heating stage; wherein, In the first heating stage, the compressor, the condenser, the first evaporator, the first pump and the second pump are working, and the heater and the first radiator are not working; in the second heating stage, the compressor, the condenser, the first evaporator, the first pump, the second pump and the heater are working, and the first radiator is not working.

12. The energy storage system according to claim 11, It is characterized in that When the temperature of the energy storage battery is lower than a first target threshold and the electronic device is in a shutdown state, the energy storage system switches to the first heating stage of the fourth working mode; after the first heating stage continues to run for a target time, when the temperature of the energy storage battery is still lower than the first target threshold, the energy storage system switches to the second heating stage of the fourth working mode.

13. The energy storage system according to claim 7, It is characterized in that The energy storage system has a fifth working mode, in which the first flow path, the second flow path of the condenser, the second flow path and the second flow path of the first evaporator are connected end to end in sequence, and the fifth working mode includes a first heating stage, a second heating stage and a third heating stage; wherein, In the first heating stage, the first pump and the second pump are working, and the compressor, the condenser, the first evaporator, the first radiator and the heater are not working; in the second heating stage, the compressor, the condenser, the first evaporator, the first pump and the second pump are working, and the first radiator and the heater are not working; in the third heating stage, the compressor, the condenser, the first evaporator, the first pump, the second pump and the heater are working, and the first radiator is not working.

14. The energy storage system according to claim 13, It is characterized in that When the temperature of the energy storage battery is lower than a first target threshold and the electronic device is in working condition, the energy storage system switches to the first heating stage of the fifth working mode; after the first heating stage continues to run for a target time, when the temperature of the energy storage battery is still lower than the first target threshold, the energy storage system switches to the second heating stage of the fifth working mode; after the second heating stage continues to run for a target time, when the temperature of the energy storage battery is still lower than the first target threshold, the energy storage system switches to the third heating stage of the fifth working mode.

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

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

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