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 and an evaporator circuit, the evaporator circuit comprises a first branch circuit and a second branch circuit in parallel, the first branch circuit comprises a first circuit of a first evaporator, the second branch circuit comprises a second evaporator for dehumidification, and at least one of the first branch circuit and the second branch circuit is selectively communicated to the compressor; a heat exchange part of an energy storage battery is communicated to a first circuit, and the first circuit comprises a first pump; a heat exchange part of an electronic device is communicated to a second circuit, and the second circuit comprises a second pump and a first radiator; and an eight-way valve is connected between a second circuit of the condenser, a second circuit of the first evaporator, the first circuit and the second circuit. The structure can realize independent dehumidification function, optimize dehumidification effect, extract part of refrigerant for synchronous dehumidification, take into account heat management and dehumidification demand, and increase the use width of the system.

Description

Technical Field

[0001] This 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 Technology

[0002] With the rapid development of renewable energy and electric vehicles, efficient and reliable energy storage systems have become a key technology. Traditional energy storage systems primarily focus on the storage and release of electrical energy in their design, with less consideration given to internal thermal management, environmental humidity control, and integration with other systems. Especially in specific application scenarios, such as humid environments or locations requiring precise humidity control, the dehumidification capability of energy storage systems is crucial. However, existing energy storage systems often lack effective dehumidification mechanisms, leading to excessively high internal humidity, which negatively impacts the performance and lifespan of energy storage batteries and electronic components. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes an energy storage system and a photovoltaic energy storage system that achieve independent dehumidification function, maximize the dehumidification effect, maintain the efficient operation of energy storage batteries and electronic devices, and can also extract part of the refrigerant for simultaneous dehumidification, thus taking into account both thermal management and dehumidification needs, increasing the practicality and applicability of the energy storage system.

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

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

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

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

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

[0009] According to the energy storage system of this application, by setting up the first and second branches connected in parallel, and controlling the on / off state between the compressor and the first and second branches, the independent dehumidification function of the energy storage system can be realized, maximizing the dehumidification effect and maintaining the efficient operation of the energy storage battery and electronic devices. At the same time, a portion of the refrigerant can be extracted for synchronous dehumidification under specific thermal management modes, taking into account both the thermal management requirements of the energy storage battery and the dehumidification requirements of the energy storage system, thereby increasing the practicality and versatility of the entire energy storage system. Furthermore, the use of an eight-way valve to integrate the thermal management flow path reduces the volume of the liquid cooling unit, improves the space utilization of the energy storage system, and realizes multiple thermal management modes, improving the overall performance. With precise temperature control and humidity management, safety hazards and malfunctions caused by overheating and overhumidity are effectively prevented, thereby improving the overall reliability and safety of the energy storage system.

[0010] According to one embodiment of this application, 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.

[0011] According to one embodiment of this application, the cooling circuit further includes:

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

[0013] The subcooling 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 this application, the refrigerant flow of the first and second branches can be independently controlled by setting the first and second expansion valves to meet different cooling or dehumidification needs. At the same time, the refrigerant distribution can be adjusted more flexibly to meet the needs of different thermal management modes, support efficient operation in multiple modes, optimize the thermal management efficiency of the entire energy storage system, and make it easier to locate and handle problems during maintenance. If the expansion valve of a certain branch fails, it can be replaced separately without affecting the operation of the entire energy storage system.

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

[0016] A cooling fan is provided, and the energy storage system forms a cooling air duct. The cooling fan is used to drive the airflow in the cooling air duct. The cooling air 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 facing the gas flow channel of the second radiator.

[0017] According to one embodiment of this 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 flow 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 this application, the energy storage system further includes:

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

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

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

[0022] According to one embodiment of this application, the energy storage system has a first operating mode in which the compressor, the condenser, the first radiator, the second evaporator, and the second pump operate, while the first pump and the first evaporator do not operate; the second branch is connected to the compressor, and the second flow path is connected end-to-end with the second path of the condenser.

[0023] According to the energy storage system of this application, through the design of the first operating mode described above, the system focuses on dehumidification. The second evaporator, as a dedicated dehumidification element, absorbs moisture from the surrounding environment and condenses it into liquid water for discharge, thereby effectively reducing ambient humidity. Since the first evaporator does not participate in operation, the system can concentrate resources on dehumidification, improving dehumidification efficiency and enabling the energy storage system to adapt to a wider range of environmental conditions, especially performing exceptionally well in high humidity environments. This is particularly important for applications with high humidity requirements. Furthermore, by shutting down the first pump and the first evaporator, unnecessary energy consumption is reduced. In application scenarios where only dehumidification is needed and thermal management of the energy storage battery is not required, this design reduces energy waste and improves the overall energy efficiency of the energy storage system.

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

[0025] According to one embodiment of this application, the energy storage system has a third operating mode in which the first radiator, the first pump, and the second pump are operating, while the compressor, the condenser, the first evaporator, and the second evaporator are not operating; 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 sequentially end to end.

[0026] According to one embodiment of this application, the energy storage system has a fourth operating mode. In this fourth operating mode, 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. The fourth operating mode includes a first heating stage and a second heating stage.

[0027] During the first heating phase, the compressor, the condenser, the first evaporator, the first pump, and the second pump operate, while the heater and the first radiator do not operate; during the second heating phase, the compressor, the condenser, the first evaporator, the first pump, the second pump, and the heater operate, while the first radiator does not operate.

[0028] According to the energy storage system of this application, through the design of the fourth working mode, when the temperature of the energy storage battery is too low, the system first switches to the first heating stage to heat the energy storage battery using the condenser of the cooling circuit, so that the energy storage battery can work normally in low-temperature environments. When higher heating power is required or the ambient temperature is extremely low, the system can switch to the second heating stage, activating the heater to work in conjunction with the original thermodynamic cycle system to provide additional heat output. This design allows 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 suitable working mode according to the actual situation, avoiding problems such as overheating and overload that may occur in a single mode, thus improving the stability and reliability of the system.

[0029] According to one embodiment of this 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 operating mode; after the first heating stage has been running for a target duration, if 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 operating mode.

[0030] According to the energy storage system of this application, through the switching logic design between the first heating stage and the second heating stage of the aforementioned fourth operating mode, when the energy storage battery temperature is too low and the electronic components shut down, the fourth operating mode is activated in a timely manner, so that the energy storage battery operates within a suitable temperature range, 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 gentle heating method to prevent the energy storage battery from being impacted by a rapid temperature rise. If the energy storage battery temperature still does not reach the ideal range after the first heating stage, the second heating stage is entered, adopting stronger heating measures until the temperature of the energy storage battery 12 rises back to a safe range. This phased control strategy helps to achieve more precise temperature management. Furthermore, by monitoring the energy storage battery temperature and the operating status of the electronic components in real time, the system automatically determines whether the fourth operating mode needs to be activated and when to adjust the heating stage. This intelligent judgment mechanism enables the energy storage system to self-adjust according to different environmental conditions and usage requirements, improving the adaptability and reliability of the energy storage system.

[0031] According to one embodiment of this application, the energy storage system has a fifth operating mode, in which the first flow path, the second path of the condenser, the second flow path, and the second path of the first evaporator are sequentially connected end-to-end, and the fifth operating 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 operate, while the compressor, the condenser, the first evaporator, the first radiator, and the heater do not operate; in the second heating stage, the compressor, the condenser, the first evaporator, the first pump, and the second pump operate, while the first radiator and the heater do not operate; in the third heating stage, the compressor, the condenser, the first evaporator, the first pump, the second pump, and the heater operate, while the first radiator does not operate.

[0033] According to the energy storage system of this application, through the design of the fifth working mode mentioned above, the waste heat of electronic devices is used to heat the energy storage battery in a low-temperature environment, minimizing the loss of waste heat and significantly improving energy utilization efficiency. At the same time, the quality of energy is fully considered. The waste heat of electronic devices can be recovered first to heat the energy storage battery. When the heat is insufficient, the heat pump can be turned on for heating, and finally the heater can be used for heating, achieving cascaded utilization of energy and realizing energy saving. Furthermore, the operating status of each component can be adjusted according to specific needs in each heating stage, realizing the flexibility of system operation. This staged control can be optimized according to ambient temperature and equipment load, maximizing the utilization of waste heat.

[0034] According to one embodiment of this application, when the temperature of the energy storage battery is lower than a first target threshold and the electronic device is in operation, the energy storage system switches to the first heating stage of the fifth operating mode; after the first heating stage has been running for a target duration, if 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 operating mode; after the second heating stage has been running for a target duration, if 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 operating mode.

[0035] According to the energy storage system of this application, through the switching logic design between the first heating stage, the second heating stage, and the third heating stage of the aforementioned fifth operating mode, when the energy storage battery temperature is too low and the electronic devices are operating, the fifth operating mode is activated in a timely manner, 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 residual heat. The staged control strategy helps to achieve more precise temperature management. Furthermore, by monitoring the energy storage battery temperature and the operating status of the electronic devices in real time, the system automatically determines whether the fifth operating mode needs to be activated and when to adjust the heating stage. This intelligent judgment mechanism enables the energy storage system to self-adjust according to different environmental conditions and usage requirements, improving the adaptability and reliability of the energy storage system.

[0036] According to one embodiment of this application, the energy storage system has a sixth operating mode, in which the first pump operates, and the compressor, the condenser, the first evaporator, the second evaporator, the first radiator, and the second pump do not operate; the first flow path and the second flow path of the first evaporator are connected end to end.

[0037] Secondly, this application provides a photovoltaic energy storage system, which includes:

[0038] Such as any of the above-mentioned energy storage systems;

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

[0040] According to the photovoltaic energy storage system of this application, the independent dehumidification function of the energy storage system can be realized through the above-mentioned energy storage system settings, maximizing the dehumidification effect. At the same time, a portion of the refrigerant can be extracted for simultaneous dehumidification under specific thermal management modes, taking into account both the thermal management requirements of the energy storage battery and the dehumidification requirements of the energy storage system, thereby increasing the practicality and versatility of the entire energy storage system. Furthermore, the use of an eight-way valve to integrate the thermal management flow path reduces the volume of the liquid cooling unit, improves the space utilization of the energy storage system, and realizes multiple thermal management modes, improving the overall performance. With precise temperature control and humidity management, safety hazards and malfunctions caused by overheating and overhumidity are effectively prevented, thereby improving the overall reliability and safety of the energy storage system.

[0041] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

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

[0043] Figure 1 This is a schematic diagram of the energy storage system provided in the embodiments of this application;

[0044] Figure 2 This is a schematic diagram of the energy storage system provided in the embodiments of this application in the first working mode;

[0045] Figure 3 This is a schematic diagram of the energy storage system provided in the embodiments of this application in the second working mode;

[0046] Figure 4 This is a schematic diagram of the energy storage system provided in the embodiments of this application in the third working mode;

[0047] Figure 5 This is a schematic diagram of the energy storage system provided in the embodiments of this application in the fourth working mode;

[0048] Figure 6 This is a schematic diagram of the energy storage system provided in the embodiments of this application in the fifth working mode;

[0049] Figure 7 This is a schematic diagram of the energy storage system provided in the embodiments of this application in the sixth working mode;

[0050] Figure 8This is a control logic diagram of the energy storage system provided in the embodiments of this application under the fourth and fifth working modes.

[0051] Figure label:

[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 components 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 Implementation

[0059] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0060] This application discloses an energy storage system 10.

[0061] The following is for reference. Figures 1-8 Describes an energy storage system 10 according to an embodiment of this application.

[0062] In some embodiments, such as Figure 1 As shown, the energy storage system 10 includes: a cooling circuit 11, an energy storage battery 12, a first flow path 13, electronic components 14, a second flow path 15, 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 path. The evaporator path includes a first branch and a second branch connected in parallel. The first branch includes a first path of a first evaporator 114, and the second branch includes a second evaporator 115 for dehumidification. At least one of the first branch and the second branch can be selectively connected to the compressor 111.

[0064] It is understood that the first evaporator 114 is a refrigeration evaporator in the refrigeration circuit 11 used to output cold energy, and the second evaporator 115 is a dehumidifying evaporator in the refrigeration circuit 11 used to absorb 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 one of them can be selected to operate.

[0065] like Figures 1-7 As shown, the heat exchange section 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 section 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 heat sink 152.

[0066] like Figures 1-7 As shown, the first heat sink 152, the electronic device 14 and the second pump 151 are sequentially connected to the pipe 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 section 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 section 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 interaction module. For example, in some embodiments, the electronic device 14 is a power conversion component.

[0069] like Figures 1-7 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. The eight 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, such as Figures 2-7As 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 14. These multiple thermal management modes may include, but are not limited to: First, in independent dehumidification mode, the energy storage battery 12 does not undergo thermal management. The first radiator 152 can dissipate heat from the electronic devices 14 and condenser 112. The second branch is connected to the compressor 111. Water vapor in the air condenses into water and adheres to the surface of the second evaporator 115. The condensed water is collected to complete the dehumidification process. Second, in active cooling mode, the first evaporator 114 can cool the energy storage battery 12. 2. Heat dissipation is achieved, and the first heat sink 152 can dissipate heat for the electronic device 14 and the condenser 112. 3. In natural cooling mode, the first heat sink 152 can dissipate heat for the energy storage battery 12 and the electronic device 14. 4. In heat pump combined heating mode, the condenser 112 can heat the energy storage battery 12, and the waste heat from the electronic device heats the first evaporator. 5. In waste heat combined heating mode, the waste heat from the electronic device 14 can heat the energy storage battery 12. 6. In active temperature equalization mode, the coolant in the first flow path 13 is driven to circulate to promote internal temperature equalization of the energy storage battery 12.

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

[0073] The energy storage system 10 provided in this application embodiment, by setting the first branch and the second branch connected in parallel, controls the on / off state between the compressor 111 and the first and second branches, and can realize the independent dehumidification function of the energy storage system 10, optimize the dehumidification effect to the maximum extent, maintain the efficient operation of the energy storage battery 12 and electronic devices 14, 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 usability of the entire energy storage system 10. In addition, the use of an eight-way valve 19 to integrate the thermal management flow path reduces the volume of the liquid cooling unit and improves the space utilization of the energy storage system 10. At the same time, multiple thermal management modes are realized, improving the overall performance. With precise temperature control and humidity management, safety hazards and malfunctions caused by overheating and overhumidity are effectively prevented, and the overall reliability and safety of the energy storage system 10 are improved.

[0074] In some embodiments, such as Figures 1-7As 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. 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, such as Figures 1-7 As shown, the first branch includes a first expansion valve 113 and a first evaporator 114 connected in series. The first expansion valve 113 can independently control the on / off state of the first branch, and the first expansion valve 113 can independently control the pressure and flow rate 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. The second expansion valve 116 can independently control the on / off state of the second branch, and the second expansion valve 116 can independently control the pressure and flow rate of the refrigerant flowing from the condenser 112 to the second evaporator 115.

[0076] In some other implementations, the first and second branches share a single expansion valve, in which case independent dehumidification mode cannot be achieved.

[0077] In some other embodiments, the first branch also includes an expansion valve, and the second branch also includes a switching valve. In this case, it is impossible to control the refrigerant pressure and flow rate of the second branch.

[0078] The energy storage system 10 provided in this application embodiment can independently control the refrigerant flow of the first branch and the second branch through the setting of the first expansion valve 113 and the second expansion valve 116, so as to meet different cooling or dehumidification needs. At the same time, it can more flexibly adjust the distribution of refrigerant to meet the needs of different thermal management modes, support efficient operation of multiple modes, optimize the thermal management efficiency of the entire energy storage system 10, and make it easier to locate and deal with problems during maintenance. If the expansion valve of a certain 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 Figures 1-7 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 the second radiator 117 and the second valve 119.

[0081] In this embodiment, such as Figures 1-7As shown, the first valve 118 can be a normally closed solenoid valve, and the second valve 119 can be a one-way valve. The one-way valve only allows refrigerant to flow from the condenser 112 to the second radiator 117. Specifically, when the normally closed solenoid valve is not working, i.e., in the closed state, the refrigerant flows through the one-way valve and the second radiator 117; when the normally closed solenoid valve is working, i.e. in the open state, the refrigerant flows into the branch where the normally closed solenoid valve is located. Due to the one-way conduction of the one-way valve, the refrigerant after flowing through the normally closed solenoid valve cannot flow back to the subcooled branch. Furthermore, because some refrigerant will remain in the pipe of the subcooled branch, forming a liquid seal effect, the refrigerant coming out of the condenser 112 cannot flow into the subcooled branch.

[0082] In other embodiments, both the first valve 118 and the second valve 119 can be on / off valves.

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

[0084] The energy storage system 10 provided in this application embodiment adopts a subcooling design in active cooling mode through the setting of the second radiator 117, the first valve 118 and the second valve 119. The second radiator 117 can subcool the saturated refrigerant, thereby improving the subcooling 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 extremely high temperature environment.

[0085] In some embodiments, such as Figures 1-7 As shown, the energy storage system 10 also includes a cooling fan 18.

[0086] The energy storage system 10 forms a heat dissipation duct, and the heat dissipation fan 18 is used to drive the airflow 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 to face the gas flow channel of the second radiator 117.

[0087] Among them, one or more cooling fans 18 can be set, where multiple means two or more.

[0088] For example, in some embodiments, such as Figures 1-7 As shown, one cooling fan 18 is provided.

[0089] In related technologies, the first and second radiators are usually arranged independently, and each of the first and second radiators exchanges heat with the external environment independently through a fan. However, using this scheme results in the heat exchange efficiency of the first and second radiators not reaching the expected level, and the number of fans and energy consumption cannot be effectively controlled.

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

[0091] The energy storage system 10 provided in this application embodiment uses a shared cooling fan 18 for the first radiator 152 and the second radiator 117 to achieve air cooling. This reduces the number of fans required and achieves the simplest and most efficient air duct structure while controlling production costs. It also improves the smoothness and orderliness of the air duct, enhances the heat dissipation efficiency of the first radiator 152 and the second radiator 117, and thus improves the energy efficiency ratio of the entire energy storage system 10.

[0092] In some embodiments, such as Figures 1-7 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 flow 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, such as Figures 1-7 As shown, the first to eighth valve ports can be 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, respectively. By changing the connection relationship between the first to eighth valve ports, the connection relationship 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 this application embodiment, through the design of the connection relationship between each valve port of the eight-way valve 19 and each component, realizes the on-off relationship of each passage by controlling the eight valve ports, thereby realizing the switching between 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, minimizing the space occupied by the liquid cooling unit, thereby significantly improving the energy density of the entire energy storage system 10, and realizing the overall miniaturization and lightweight design.

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

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

[0097] In this embodiment, such as Figures 1-7 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 of the outlet of the first flow path 13 to accelerate the exhaust speed of the water tank 16.

[0098] The energy storage system 10 provided in this application embodiment, through the above-mentioned water tank 16, realizes the water path connection and air path connection between the water tank 16 and the first flow path 13, shortens the water supply path of the water tank 16, improves the water supply efficiency, thereby accelerating the water circulation rate, and thus optimizing the heat dissipation effect on the energy storage battery 12. At the same time, it accelerates the exhaust speed of the water tank 16, prevents gas from blocking the circulation of cooling water, and optimizes the cooling effect of water circulation.

[0099] In some embodiments, such as Figures 1-7 As shown, the energy storage system 10 also includes a heater 17.

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

[0101] In actual operation, under the combined heat pump heating mode, when the heat provided by the heat pump is insufficient to meet the demand, the heater 17 is activated. The condenser 112, in conjunction with the heater 17, heats the energy storage battery 12, and the first radiator 152 dissipates heat from the electronic device 14 and the condenser 112. Under the combined waste heat heating mode, when the heat provided by the electronic device 14 is insufficient to meet the demand, the heater 17 is activated. The electronic device 14, in conjunction with the heater 17, heats the energy storage battery 12. If the heat provided by the electronic device 14 and the heater 17 is still insufficient to meet the demand, the heat pump is activated, and the electronic device 14, the heater 17, and the condenser 112 work together to heat the energy storage battery 12.

[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, the compressor 111 is also in working state in these stages. Both the first and second branches can be connected to the compressor 111. In this way, part of the refrigerant in the refrigeration circuit 11 can enter the first branch to achieve cooling, 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 playing 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 cooling mode, the heat pump combined heating mode, and the waste heat combined heating mode.

[0103] The energy storage system 10 provided in this application embodiment, through the setting of the heater 17, enables the system to provide multiple heating schemes such as heat pump heating, waste heat heating of electronic devices 14, heating of heater 17, or at least a combination of the above. Different heating schemes can be selected according to the actual heat demand, which increases the maximum total heat supply of the entire heating system, enhances the adaptability of the energy storage system 10 in extremely cold weather, and refines the heating mode.

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

[0105] In this embodiment, such as Figure 2As shown, the first operating mode is the aforementioned independent dehumidification mode. When the energy storage system 10 switches to the first operating mode, the first expansion valve 113 is closed, the second expansion valve 116 is open, and the on / off states of each port of the eight-way valve 19 are as follows: the second port A2 of the eight-way valve 19 is connected to the fourth port A4 of the eight-way valve 19, and the fifth port A5 of the eight-way valve 19 is connected to the eighth port A8 of the eight-way valve 19. When the energy storage system 10 includes a second radiator 117 and a heater 17, the second radiator 117 is operational, and the heater 17 is not operational.

[0106] The energy storage system 10 provided in this application embodiment, through the design of the first working mode described above, focuses on dehumidification. The second evaporator 115, as a dedicated dehumidification element, absorbs moisture from the surrounding environment and condenses it into liquid water for discharge, thereby effectively reducing ambient humidity. Since the first evaporator 114 does not participate in operation, the system can concentrate resources on dehumidification, improving dehumidification efficiency. This allows the energy storage system 10 to adapt to a wider range of environmental conditions, especially performing well in high humidity environments. This is particularly important for applications with high humidity requirements. Furthermore, by shutting down the first pump 131 and the first evaporator 114, unnecessary energy consumption is reduced. In usage scenarios where only dehumidification is needed and thermal management of the energy storage battery 12 is not required, this design reduces energy waste and improves the overall energy efficiency of the energy storage system 10.

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

[0108] In this embodiment, such as Figure 3 As shown, the second operating mode is the aforementioned active cooling mode. When the energy storage system 10 switches to the second operating mode, the first expansion valve 113 opens, and the second expansion valve 116 is controlled to open and close according to actual needs. The on / off states of each valve port of the eight-way valve 19 are as follows: the first valve port A1 of the eight-way valve 19 is connected to the third valve port A3, the second valve port A2 of the eight-way valve 19 is connected to the fourth valve port A4, the fifth valve port A5 of the eight-way valve 19 is connected to the eighth valve port A8, and the sixth valve port A6 of the eight-way valve 19 is connected to the seventh valve port A7. When the energy storage system 10 includes the second radiator 117 and the heater 17, neither the second radiator 117 nor the heater 17 operates.

[0109] The energy storage system 10 provided in this application embodiment, through the design of the second working mode described above, realizes that when the temperature of the energy storage battery 12 is too high, the cooling circuit 11 is used to perform refrigerant cooling on the energy storage battery 12, while the first heat sink 152 is used to dissipate heat on the electronic device 14 and the condenser 112. This takes into account the heat dissipation needs of the energy storage battery 12, the electronic device 14 and the condenser 112, and alleviates a series of domino effects caused by thermal runaway of the energy storage battery 12 due to overheating, thereby extending the working life of the energy storage battery 12. In addition, the second heat sink 117 can perform subcooling treatment on the saturated refrigerant, thereby increasing the subcooling degree of the refrigerant, improving the cooling capacity and cooling performance, and thus increasing the applicability of the energy storage system 10.

[0110] In some embodiments, such as 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, while 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 flow path of the condenser 112, the second flow path 15 and the second flow path of the first evaporator 114 are connected end to end in sequence.

[0111] In this embodiment, such as Figure 4 As shown, the third operating mode is the aforementioned natural cooling mode. When the energy storage system 10 switches to the third operating mode, the on / off states of each valve port of the eight-way valve 19 are as follows: the first valve port A1 of the eight-way valve 19 is connected to the second valve port A2, the third valve port A3 of the eight-way valve 19 is connected to the fourth valve port A4, the fifth valve port A5 of the eight-way valve 19 is connected to the eighth valve port A8, and the sixth valve port A6 of the eight-way valve 19 is connected to the seventh valve port A7. When the energy storage system 10 includes a second radiator 117 and a heater 17, neither the second radiator 117 nor the heater 17 operates.

[0112] The energy storage system 10 provided in this application embodiment, through the design of the third working mode described above, realizes that when the temperature of the energy storage battery 12 is high, the first heat sink 152 is used to perform air cooling for the energy storage battery 12 and electronic devices 14, which meets the basic heat dissipation requirements of the energy storage battery 12 and prevents the cooling circuit 11 from being activated when the energy storage battery 12 heats up slightly, thus causing unnecessary energy consumption. In this way, the operating efficiency of the entire energy storage system 10 is improved without affecting the performance of the energy storage battery 12 itself.

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

[0114] In this embodiment, such as Figure 5 As shown, the fourth operating mode is the aforementioned heat pump combined heating mode. When the energy storage system 10 switches to the fourth operating mode, the first expansion valve 113 opens, and the second expansion valve 116 is controlled to open and close according to actual needs. The on / off states of each valve port of the eight-way valve 19 are as follows: 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. When the energy storage system 10 includes a second radiator 117 and a 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 this application embodiment, through the design of the fourth working mode described above, enables the system to switch to the first heating stage when the temperature of the energy storage battery 12 is too low. The condenser 112 of the cooling circuit 11 is used to heat the energy storage battery 12, so that the energy storage battery 12 can work normally in low-temperature environments. When higher heating power is required or the ambient temperature is extremely low, the system can switch to the second heating stage, activating the heater 17 to work in conjunction with the original thermodynamic cycle system to provide additional heat output. This design allows the energy storage system 10 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 suitable working mode according to the actual situation, avoiding problems such as overheating and overload that may occur in a single mode, thus improving the stability and reliability of the system.

[0116] In some embodiments, such as 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 has been running for the target duration, 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 can 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 believes that the corresponding heating mode needs to be activated to prevent the performance of the energy storage battery 12 from deteriorating or being damaged.

[0118] The second target threshold can 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 below 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 determine whether it is necessary to switch to a higher intensity heating mode. When the target duration is actually determined, factors such as the efficiency of the cooling circuit 11, the thermal capacity of the energy storage battery 12, and the ambient temperature need to be taken into account.

[0120] For example, the target duration may be set from 1 minute to 10 minutes, and there is no limit here.

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

[0122] In actual implementation, such as Figure 8As shown, the controller can compare the acquired temperature of the energy storage battery 12 with the set first target threshold. If the temperature of the energy storage battery 12 is not lower than the first target threshold, the energy storage system 10 does not switch to any heating mode. If the temperature of the energy storage battery 12 is lower than the first target threshold, the controller can analyze the acquired operating information of the electronic device 14. If 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 has been running for a target duration, the controller can again compare the acquired temperature of the energy storage battery 12 with the set first target threshold. If the temperature of the energy storage battery 12 is not lower than the first target threshold, the controller will switch to the first heating stage. Under the condition of a target threshold, the controller compares the acquired temperature of the energy storage battery 12 with the set second target threshold. If the temperature of the energy storage battery 12 is greater than the set second target threshold, the energy storage system 10 stops operating the first heating stage. If the temperature of the energy storage battery 12 is not greater than the set second target threshold, the energy storage system 10 continues to operate the current first heating stage. If 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 operate until the temperature of the energy storage battery 12 is greater than the first target threshold, at which point the controller controls the energy storage system 10 to switch back to the first heating stage.

[0123] The energy storage system 10 provided in this application embodiment, through the switching logic design between the first heating stage and the second heating stage of the fourth working mode, promptly activates the fourth working mode when the temperature of the energy storage battery 12 is too low and the electronic device 14 shuts down, so that the energy storage battery 12 operates within a suitable temperature range, extending the service life of the energy storage battery 12. At the same time, it can flexibly adjust according to the actual temperature of the energy storage battery 12. The first heating stage adopts a relatively mild heating method to prevent the temperature from rising sharply and impacting 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, it enters the second heating stage and adopts stronger heating measures until the temperature of the energy storage battery 12 rises back to a safe range. This phased control strategy helps to achieve more precise temperature management. Furthermore, by monitoring the temperature of the energy storage battery 12 and the operating status of the electronic device 14 in real time, the system automatically determines whether to activate the fourth working mode and when to adjust the heating stage. This intelligent judgment mechanism enables the energy storage system 10 to self-adjust according to different environmental conditions and usage requirements, improving the adaptability and reliability of the energy storage system 10.

[0124] In some embodiments, such as Figure 6As shown, the energy storage system 10 has a fifth operating mode. In the fifth operating mode, the first flow path 13, the second flow path of the condenser 112, the second flow path 15, and the second flow path of the first evaporator 114 are connected sequentially. The fifth operating mode includes a first heating stage, a second heating stage, and a third heating stage. In the first heating stage, the first pump 131 and the second pump 151 are working, while the compressor 111, condenser 112, first evaporator 114, first radiator 152, and heater 17 are not working. In the second heating stage, the compressor 111, condenser 112, first evaporator 114, first pump 131, and second pump 151 are working, while the first radiator 152 and heater 17 are not working. In the third heating stage, the compressor 111, condenser 112, first evaporator 114, first pump 131, second pump 151, and heater 17 are working, while the first radiator 152 is not working.

[0125] In this embodiment, such as Figure 6 As shown, the fifth operating mode is the aforementioned waste heat combined heating mode. When the energy storage system 10 switches to the fifth operating mode, in the third heating stage, the first expansion valve 113 opens, and the second expansion valve 116 is controlled to open and close according to actual needs. The on / off states of each valve port of the eight-way valve 19 are as follows: 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. When 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 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 this application embodiment, through the design of the fifth working mode described above, utilizes the waste heat of the electronic device 14 to heat the energy storage battery 12 in a low-temperature environment, minimizing waste heat loss and significantly improving energy utilization efficiency. At the same time, it fully considers the quality of energy, first recovering the waste heat of the electronic device 14 to heat the energy storage battery 12, turning on the heat pump when the heat is insufficient, and finally using the heater 17 to heat, achieving tiered energy utilization and energy saving. Furthermore, 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 ambient temperature and equipment load, maximizing the utilization of waste heat.

[0127] In some embodiments, such as 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 operation, the energy storage system 10 switches to the first heating stage of the fifth operating mode; after the first heating stage has been running for a target duration, if 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 operating mode; after the second heating stage has been running for a target duration, if 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 operating mode.

[0128] The first target threshold can 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 believes that the corresponding heating mode needs to be activated to prevent the performance of the energy storage battery 12 from deteriorating or being damaged.

[0129] The second target threshold can 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 below 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 determine whether it is necessary to switch to a higher intensity heating mode. When the target duration is actually determined, factors such as the efficiency of the cooling circuit 11, the thermal capacity of the energy storage battery 12, and the ambient temperature need to be taken into account.

[0131] For example, the target duration may be set from 1 minute to 10 minutes, and there is no limit here.

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

[0133] In actual implementation, such as Figure 8As shown, the controller can compare the acquired temperature of the energy storage battery 12 with a set first target threshold. If the temperature of the energy storage battery 12 is not lower than the first target threshold, the energy storage system 10 does not switch to any heating mode. If the temperature of the energy storage battery 12 is lower than the first target threshold, the controller can analyze the acquired operating information of the electronic device 14. If the electronic device 14 is in a working state, the controller controls the energy storage system 10 to directly switch to the first heating stage. After the first heating stage has been running for a target duration, the controller can again compare the acquired temperature of the energy storage battery 12 with the set first target threshold. If the temperature of the energy storage battery 12 is not lower than the first target threshold, the controller compares the acquired temperature of the energy storage battery 12 with a set second target threshold. If the temperature of the energy storage battery 12 is higher than the set second target threshold, the energy storage system 10 stops running the first heating stage. If the temperature of the energy storage battery 12 is not higher than the set second target threshold, the energy storage system 10 continues to run the current heating stage. In the first heating stage, if the temperature of the energy storage battery 12 is still lower 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 has been running for the target duration, the controller can compare the temperature of the energy storage battery 12 obtained at this time with the set first target threshold. If the temperature of the energy storage battery 12 is not lower than the first target threshold, the controller compares the temperature of the energy storage battery 12 obtained at this time with the set second target threshold. If the temperature of the energy storage battery 12 is higher than the set second target threshold, the energy storage system 10 switches back to the first heating stage. If the temperature of the energy storage battery 12 is not higher than the set second target threshold, the energy storage system 10 continues to run in the current second heating stage. If the temperature of the energy storage battery 12 is still lower 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 higher than the first target threshold, at which point the controller controls the energy storage system 10 to switch back to the second heating stage.

[0134] The energy storage system 10 provided in this application embodiment, through the switching logic design between the first heating stage, the second heating stage, and the third heating stage of the fifth working mode, promptly activates the fifth working mode when the temperature of the energy storage battery 12 is too low and the electronic device 14 is working, so that the energy storage battery 12 operates within a suitable temperature range, extending the service life of the energy storage battery 12, while minimizing the loss of residual heat. The staged control strategy helps to achieve more precise temperature management. Furthermore, by monitoring the temperature of the energy storage battery 12 and the operating status of the electronic device 14 in real time, the system automatically determines whether the fifth working mode needs to be activated and when to adjust the heating stage. This intelligent judgment mechanism enables the energy storage system 10 to self-adjust according to different environmental conditions and usage requirements, improving the adaptability and reliability of the energy storage system 10.

[0135] In some embodiments, such as 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, while the compressor 111, condenser 112, first evaporator 114, second evaporator 115, first radiator 152 and second pump 151 are not working. The first flow path 13 and the second flow path of the first evaporator 114 are connected end to end.

[0136] In this embodiment, such as Figure 7 As shown, the sixth operating mode is the aforementioned active temperature equalization mode. When the energy storage system 10 switches to the sixth operating mode, the on / off states of each valve port of the eight-way valve 19 are as follows: 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. When the energy storage system 10 includes the second radiator 117 and the heater 17, neither the second radiator 117 nor the heater 17 is operational.

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

[0138] This 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 described above.

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

[0141] A photovoltaic power generation system may include photovoltaic modules and an inverter unit. 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-consuming 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 this application embodiment, through the above-mentioned energy storage system 10 configuration, can realize the independent dehumidification function of the energy storage system 10, optimize the dehumidification effect to the maximum extent, and can also extract part of the refrigerant for synchronous dehumidification in a specific thermal management mode, taking into account both 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 usability of the entire energy storage system 10. Furthermore, the use of an eight-way valve 19 to integrate the thermal management flow path reduces the volume of the liquid cooling unit and improves the space utilization of the energy storage system 10. At the same time, multiple thermal management modes are realized, improving the overall performance. With precise temperature control and humidity management, safety hazards and malfunctions caused by overheating and overhumidity are effectively prevented, thereby improving the overall reliability and safety of the energy storage system 10.

[0143] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0144] In the description of this application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

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

[0146] In the description of this application, "multiple" means two or more.

[0147] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0148] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0149] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

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

Claims

1. An energy storage system, characterized in that, include: A refrigeration circuit, comprising a compressor, a first path of a condenser, and an evaporator path, wherein the evaporator path comprises a first branch and a second branch connected in parallel, the first branch comprising a first path of a first evaporator, the second branch comprising a second evaporator, the second evaporator being used for dehumidification, and at least one of the first branch and the second branch being selectively connected to the compressor. An energy storage battery and a first flow path, wherein the heat exchange section of the energy storage battery is connected to the first flow path, and the first flow path includes a first pump; An electronic device and a second flow path, wherein the heat exchange section of the electronic device is connected to the second flow path, and the second flow path includes a second pump and a first heat sink; An eight-way valve is connected between the second path of the condenser, the second path of the first evaporator, the first flow path, and the second flow path. The eight ports of the eight-way valve are selectively openable and closed. Specifically, the first port of the eight-way valve is connected to the inlet of the second path of the first evaporator; the second port is connected to the inlet of the second flow path; the third port is connected to the outlet of the first flow path; the fourth port is connected to the inlet of the second path of the condenser; the fifth port is connected to the outlet of the second flow path; the sixth port is connected to the outlet of the second path of the first evaporator; the seventh port is connected to the inlet of the first flow path; and the eighth port is connected to the outlet of the second path of the condenser. A heater, the heater being connected between the eighth port of the eight-way valve and the outlet of the second path of the condenser; The energy storage system has a fifth operating mode. In this fifth operating mode, 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 sequentially end-to-end. The fifth operating mode includes a first heating stage, a second heating stage, and a third heating stage. In the first heating stage, the first pump and the second pump operate, while the compressor, the condenser, the first evaporator, the first radiator, and the heater do not operate; in the second heating stage, the compressor, the condenser, the first evaporator, the first pump, and the second pump operate, while the first radiator and the heater do not operate; in the third heating stage, the compressor, the condenser, the first evaporator, the first pump, the second pump, and the heater operate, while the first radiator does not operate. When the temperature of the energy storage battery is below the first target threshold and the electronic device is in operation, the energy storage system switches to the first heating stage of the fifth operating mode; after the first heating stage has been running for a target duration, if the temperature of the energy storage battery is still below the first target threshold, the energy storage system switches to the second heating stage of the fifth operating mode; after the second heating stage has been running for a target duration, if the temperature of the energy storage battery is still below the first target threshold, the energy storage system switches to the third heating stage of the fifth operating mode.

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

3. The energy storage system according to claim 2, characterized in that, The refrigeration circuit also includes: A first valve is connected in series between the condenser and the first expansion valve; The subcooling 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, characterized in that, Also includes: A cooling fan is provided, and the energy storage system forms a cooling air duct. The cooling fan is used to drive the airflow in the cooling air duct. The cooling air 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 facing the gas flow channel of the second radiator.

5. The energy storage system according to claim 1, characterized in that, Also includes: A water tank, which is connected to the seventh valve port of the eight-way valve.

6. The energy storage system according to any one of claims 1-5, characterized in that, The energy storage system has a first operating mode, in which the compressor, the condenser, the first radiator, the second evaporator and the second pump are operating, and the first pump and the first evaporator are not operating. The second branch is connected to the compressor, and the second flow path is connected end-to-end to the second path of the condenser.

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

8. The energy storage system according to any one of claims 1-5, characterized in that, The energy storage system has a third operating mode, in which the first radiator, the first pump, and the second pump are operating, while the compressor, the condenser, the first evaporator, and the second evaporator are not operating; 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 sequentially end to end.

9. The energy storage system according to claim 1, characterized in that, The energy storage system has a fourth operating mode. In this fourth operating mode, 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. The fourth operating mode includes a first heating stage and a second heating stage. During the first heating phase, the compressor, the condenser, the first evaporator, the first pump, and the second pump operate, while the heater and the first radiator do not operate; during the second heating phase, the compressor, the condenser, the first evaporator, the first pump, the second pump, and the heater operate, while the first radiator does not operate.

10. The energy storage system according to claim 9, characterized in that, When the temperature of the energy storage battery is lower than the 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 operating mode; after the first heating stage has been running for a target duration, if 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 operating mode.

11. The energy storage system according to any one of claims 1-5, characterized in that, The energy storage system has a sixth operating mode. In the sixth operating mode, the first pump is working, while 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 flow path of the first evaporator are connected end to end.

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

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