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 circuit comprises a compressor, a condenser, an expansion valve and a first path of an evaporator; a heat exchange part of the energy storage battery communicates with a first flow path, an outlet of the first flow path is connected to an inlet of a second path of the evaporator, 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; an inlet of the mixing device is communicated with an inlet and an outlet of the second path of the evaporator; a plurality of valve ports of the valve group are respectively connected with the first flow path, the second flow path, the first radiator and the mixing device, and the valve ports can be selectively opened and closed. Through the arrangement of the mixing device, the high-temperature cooling liquid which does not enter the evaporator and the low-temperature cooling liquid which leaves from the evaporator are fully mixed, so that the cooling efficiency of the energy storage battery is improved, the uniform distribution of the temperature of the cooling liquid is realized, the performance of the energy storage battery is optimized, and the energy consumption of the energy storage system is reduced.

Description

Technical Field

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

[0002] In current energy storage systems, a refrigerant circuit is usually combined with a liquid cooling circuit to manage the heat of energy storage batteries and other heat-generating devices. In practical applications, the evaporator of the liquid cooling circuit is limited by its capacity and cannot directly handle the entire coolant flow. In related technologies, a coolant diversion strategy is generally adopted in system design, that is, the coolant is divided into two paths: one path enters the evaporator for efficient heat exchange to reduce the temperature, while the other path maintains a higher temperature. The two paths of coolant are then simply merged through pipelines downstream in an attempt to achieve mixing for energy storage battery cooling.

[0003] However, this simple merging method has significant defects. Specifically, the mixing effect between the low-temperature coolant and the high-temperature coolant is not ideal. This unevenly cold and hot coolant is directly supplied to the energy storage battery, which not only reduces the cooling efficiency of the energy storage battery, but may also cause excessive temperature gradients between multiple battery cells in the energy storage battery, thereby affecting the performance of the energy storage battery, increasing the energy consumption of the energy storage system, and even in some extreme cases may cause the risk of thermal runaway of the energy storage battery. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an energy storage system and a photovoltaic energy storage system to improve the cooling efficiency of the energy storage battery, achieve uniform distribution of the coolant temperature, optimize the performance of the energy storage battery, and reduce the energy consumption of the energy storage system.

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

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

[0007] An energy storage battery and a first flow path, wherein a heat exchange portion of the energy storage battery is connected to the first flow path, an outlet of the first flow path is connected to an inlet of a second path of the evaporator, and the first flow path includes a first pump;

[0008] An electronic device and a second flow path, a heat exchange portion of the electronic device is connected to the second flow path, and the second flow path includes a second pump;

[0009] first radiator;

[0010] a mixing device, wherein the inlet of the mixing device is connected to the inlet and the outlet of the second path of the evaporator;

[0011] A valve group, wherein a plurality of valve ports of the valve group are respectively connected to the first flow path, the second flow path, the first radiator and the mixing device, and the plurality of valve ports of the valve group can be selectively opened and closed.

[0012] According to the energy storage system of the present application, the high-temperature coolant that has not yet entered the evaporator and the low-temperature coolant leaving the evaporator are fully mixed through the setting of the above-mentioned mixing device, thereby significantly improving the cooling efficiency of the energy storage battery, reducing the probability of thermal runaway of the energy storage battery in a high-temperature environment, and thus helping to improve the safety performance of the energy storage battery. At the same time, a uniform distribution of the coolant temperature is achieved, the uniformity of the coolant temperature supplied to the energy storage battery is improved, the temperature gradient between multiple battery cells in the energy storage battery is reduced, and the phenomenon of local overheating in the energy storage battery due to heat accumulation is alleviated, thereby optimizing the performance of the energy storage battery and reducing the energy consumption of the energy storage system.

[0013] According to one embodiment of the present application, the mixing device includes a static mixer.

[0014] According to one embodiment of the present application, the valve group includes a first valve port to a sixth valve port, the first valve port of the valve group is connected to the outlet of the first radiator, the second valve port of the valve group is connected to the inlet of the first radiator, the third valve port of the valve group is connected to the outlet of the mixing device, the fourth valve port of the valve group is connected to the inlet of the first flow path, the fifth valve port of the valve group is connected to the outlet of the second flow path, and the sixth valve port of the valve group is connected to the inlet of the second flow path.

[0015] According to one embodiment of the present application, the valve group includes:

[0016] a first valve, wherein a first valve port of the first valve is connected to an inlet of the first radiator, a third valve port of the first valve is connected to an inlet of the first flow path, and a fourth valve port of the first valve is connected to an outlet of the mixing device;

[0017] A second valve, wherein a first valve port of the second valve is connected to an inlet of the second flow path, a second valve port of the second valve is connected to an outlet of the second flow path, a third valve port of the second valve is connected to the second valve port of the first valve, and a fourth valve port of the second valve is connected to an outlet of the first radiator.

[0018] According to one embodiment of the present application, the second flow path further includes:

[0019] A second radiator is connected in series to the first flow path, and an inlet of the second radiator is connected to an outlet of the heat exchange portion of the electronic device.

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

[0021] A heat dissipation fan, wherein the energy storage system forms a heat dissipation duct, and 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 condenser, and the heat dissipation duct is connected to at least one of the gas flow channel of the first radiator and the gas flow channel of the second radiator.

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

[0023] A water tank is connected to the third valve port of the first valve.

[0024] According to one embodiment of the present application, the energy storage system further includes:

[0025] a heater connected in parallel to the second flow path;

[0026] A three-way valve, wherein a first valve port of the three-way valve is connected to a first valve port of the second valve, a second valve port of the three-way valve is connected to an inlet of the second flow path, and a third valve port of the three-way valve is connected to an inlet of the heater.

[0027] According to one embodiment of the present application, the energy storage system has a first operating mode. In the first operating mode, the compressor, the first pump, the second pump and the first radiator are all working, the first flow path, the second path of the evaporator and the mixing device are connected end to end in sequence; the second flow path and the first radiator are connected end to end.

[0028] According to one embodiment of the present application, the energy storage system has a second operating mode. In the second operating mode, the first pump, the second pump, the first radiator and the second radiator all work, the compressor does not work, the first flow path, the second path of the evaporator, the mixing device and the first radiator are connected end to end in sequence; the second flow path is connected end to end.

[0029] According to one embodiment of the present application, the energy storage system has a third operating mode. In the third operating mode, the first pump and the second pump are both working, the compressor and the first radiator are both not working, the first flow path, the second path of the evaporator, the mixing device and the first radiator are connected end to end in sequence; the second flow path is connected end to end.

[0030] According to one embodiment of the present application, the energy storage system has a fourth operating mode. In the fourth operating mode, the first pump and the second pump are working, the compressor and the first radiator are not working, and the first flow path, the second path of the evaporator, the mixing device, the first radiator and the second flow path are connected end to end in sequence.

[0031] According to one embodiment of the present application, the energy storage system has a fifth operating mode. In the fifth operating mode, the first pump and the heater are working, the compressor, the second pump and the first radiator are not working, and the first flow path, the second path of the evaporator, the mixing device, the first radiator and the heater are connected end to end in sequence.

[0032] 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, the second pump and the heater are working, the compressor and the first radiator are not working, and the first flow path, the second path of the evaporator, the mixing device, the first radiator and the second flow path are connected end to end in sequence.

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

[0034] An energy storage system as described above;

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

[0036] According to the photovoltaic energy storage system of the present application, through the configuration of the above energy storage system, the high-temperature coolant that has not yet entered the evaporator and the low-temperature coolant leaving the evaporator are fully mixed, thereby significantly improving the cooling efficiency of the energy storage battery, reducing the probability of thermal runaway of the energy storage battery in a high-temperature environment, and thus helping to improve the safety performance of the energy storage battery. At the same time, a uniform distribution of the coolant temperature is achieved, the uniformity of the coolant temperature supplied to the energy storage battery is improved, the temperature gradient between multiple battery cells in the energy storage battery is reduced, and the phenomenon of local overheating in the energy storage battery due to heat accumulation is alleviated, thereby optimizing the performance of the energy storage battery and reducing the energy consumption of the energy storage system.

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

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

[0039] Figure 1 It is one of the structural schematic diagrams of the energy storage system provided in the embodiment of the present application;

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

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

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

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

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

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

[0046] Figure 8 This is the second structural schematic diagram of the energy storage system provided in the embodiment of the present application.

[0047] Reference numerals:

[0048] Energy storage system 10;

[0049] Refrigeration circuit 11, compressor 111, condenser 112, expansion valve 113, evaporator 114;

[0050] Energy storage battery 12, electronic device 13; first radiator 14;

[0051] First flow path 15, first pump 151;

[0052] A second flow path 16, a second pump 161, and a second radiator 162;

[0053] Mixing device 17;

[0054] Valve group 18, first valve 181, second valve 182;

[0055] Heater 19, three-way valve 21, cooling fan 22, water tank 23. DETAILED DESCRIPTION

[0056] 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.

[0057] The present application discloses an energy storage system 10 .

[0058] Reference below Figure 1-Figure 8An energy storage system 10 according to an embodiment of the present application is described.

[0059] In some embodiments, Figure 1 and Figure 8 As shown, the energy storage system 10 includes: a refrigeration circuit 11, an energy storage battery 12, a first flow path 15, an electronic device 13, a second flow path 16, a first radiator 14, a mixing device 17 and a valve group 18.

[0060] The refrigeration circuit 11 includes a compressor 111, a condenser 112, an expansion valve 113 and a first path of the evaporator 114; the heat exchange portion of the energy storage battery 12 is connected to the first path 15, the outlet of the first path 15 is connected to the inlet of the second path of the evaporator 114, and the first path 15 includes a first pump 151; the heat exchange portion of the electronic device 13 is connected to the second path 16, and the second path 16 includes a second pump 161; the inlet of the mixing device 17 is connected to both the inlet and outlet of the second path of the evaporator 114; the multiple valve ports of the valve group 18 are respectively connected to the first path 15, the second path 16, the first radiator 14 and the mixing device 17, and the multiple valve ports of the valve group 18 can be selectively opened and closed.

[0061] The coolant in the first flow path 15 can exchange heat with the heat exchange part of the energy storage battery 12 to achieve thermal management of the energy storage battery 12; the coolant in the second flow path 16 can exchange heat with the heat exchange part of the electronic device 13 to achieve thermal management of the electronic device 13.

[0062] The electronic device 13 may be a high-heat generating device in the energy storage system 10 . Specifically, the electronic device 13 may include but is not limited to a power conversion component, a communication module, a detection module or an interactive module.

[0063] For example, in some embodiments, the electronic device 13 is a power conversion component.

[0064] The mixing device 17 is used to fully mix the high-temperature coolant that has not yet entered the evaporator 114 and the low-temperature coolant leaving the evaporator 114, wherein the mixing device 17 may include but is not limited to a static mixer, a dynamic mixer, a turbine mixer, a mechanical blade mixer, an ultrasonic mixer or a magnetic agitator, etc., which is not limited here.

[0065] For example, in some embodiments, the mixing device 17 is a static mixer.

[0066] For example, in other embodiments, the mixing device 17 is a mechanical blade mixer.

[0067] For example, in some other embodiments, the mixing device 17 is an ultrasonic mixer.

[0068] In actual implementation, Figure 2-Figure 4As shown, the energy storage system 10 can be configured with multiple thermal management modes, and each thermal management mode has different temperature control methods for the energy storage battery 12. The multiple thermal management modes may include but are not limited to: First, in the active cooling mode, the evaporator 114 of the refrigeration circuit 11 can dissipate heat for the energy storage battery 12, and the mixing device 17 can fully mix the high-temperature coolant that leaves the heat exchange part of the energy storage battery 12 and has not yet entered the evaporator 114 and the low-temperature coolant that leaves the evaporator 114, so that the coolant that re-enters the heat exchange part of the energy storage battery 12 is cooled by the heat exchanger 114 before the multiple battery cells are cooled. When cooling down, the heat exchange amount of each battery cell is as consistent as possible; secondly, in the natural cooling mode, the first radiator 14 can dissipate heat for the energy storage battery 12; thirdly, in the active temperature equalization mode, the coolant in the first flow path 15 and the second flow path 16 is driven to circulate to promote the internal temperature equalization of the energy storage battery 12, and the mixing device 17 can further mix the high-temperature coolant leaving the heat exchange part of the energy storage battery 12 to optimize the temperature equalization effect of this mode; fourthly, in the waste heat utilization mode, the waste heat of the electronic device 13 can heat the energy storage battery 12.

[0069] The energy storage system 10 provided in the embodiment of the present application, through the setting of the above-mentioned mixing device 17, fully mixes the high-temperature coolant that has not yet entered the evaporator 114 and the low-temperature coolant leaving the evaporator 114, thereby significantly improving the cooling efficiency of the energy storage battery 12, reducing the probability of thermal runaway of the energy storage battery 12 in a high-temperature environment, and thus helping to improve the safety performance of the energy storage battery 12. At the same time, it realizes the uniform distribution of the coolant temperature, improves the uniformity of the coolant temperature supplied to the energy storage battery 12, reduces the temperature gradient between multiple battery cells in the energy storage battery 12, and alleviates the phenomenon of local overheating in the energy storage battery 12 due to heat accumulation, thereby optimizing the performance of the energy storage battery 12 and reducing the energy consumption of the energy storage system 10.

[0070] In some embodiments, mixing device 17 comprises a static mixer.

[0071] In this embodiment, if Figure 1-Figure 8 As shown, a series of fixed-shaped mixing elements, such as spiral blades, baffles, etc., may be provided inside the static mixer, and these mixing elements will not move with the fluid. The high-temperature coolant that has not yet entered the evaporator 114 and the low-temperature coolant that has left the evaporator 114 may first be merged together and then enter the static mixer through the same inlet. Inside the static mixer, the high-temperature coolant and the low-temperature coolant are subjected to the effects of segmentation, shearing, rotation, and recombination when flowing through the mixing elements, thereby achieving uniform mixing of temperature and quality.

[0072] In other embodiments, the high-temperature coolant that has not yet entered the evaporator 114 and the low-temperature coolant that has left the evaporator 114 may enter the static mixer through different inlets.

[0073] The energy storage system 10 provided in the embodiment of the present application, through the above-mentioned design of setting the mixing device 17 as a static mixer, the static mixer uses the flow energy of the high-temperature coolant and the low-temperature coolant and the geometric shape of the mixing element to create a complex flow pattern, enhance the contact and mixing effect between the high-temperature coolant and the low-temperature coolant, and does not require an external power source. The mixing process can be completed only by the kinetic energy of the coolant itself, thereby achieving low energy consumption and high efficiency.

[0074] In some embodiments, Figure 8 As shown, the valve group 18 includes a first valve port D1 to a sixth valve port D6, the first valve port D1 of the valve group 18 is connected to the outlet of the first radiator 14, the second valve port D2 of the valve group 18 is connected to the inlet of the first radiator 14, the third valve port D3 of the valve group 18 is connected to the outlet of the mixing device 17, the fourth valve port D4 of the valve group 18 is connected to the inlet of the first flow path 15, the fifth valve port D5 of the valve group 18 is connected to the outlet of the second flow path 16, and the sixth valve port D6 of the valve group 18 is connected to the inlet of the second flow path 16.

[0075] In this embodiment, if Figure 8 As shown, the valve group 18 is a six-way valve, and the six valve ports can respectively connect the inlet and outlet of the first radiator 14, the outlet of the mixing device 17, the inlet of the first flow path 15, and the inlet and outlet of the second flow path 16. Based on the fact that the inlet of the mixing device 17 is connected to the inlet and outlet of the second path of the evaporator 114, by changing the connection relationship between the six valve ports of the valve group 18, the relationship between the first radiator 14, the second path of the evaporator 114, the first flow path 15, and the second flow path 16 can be changed to achieve a variety of thermal management modes.

[0076] The energy storage system 10 provided in the embodiment of the present application utilizes a structural design in which the first valve port D1 to the sixth valve port D6 are integrated into one valve, thereby further improving the integration of water-side components, so that the water-side pipelines are all concentratedly arranged at the six-way valve, thereby reducing the space occupied by the liquid cooling unit as much as possible, thereby significantly improving the energy density of the entire energy storage system 10, and achieving overall miniaturization and lightweight design. At the same time, by controlling the on-off state of the six valve ports, a variety of thermal management modes are realized, thereby increasing the use width of the energy storage system 10.

[0077] In some embodiments, the valve group 18 includes a first valve 181 and a second valve 182 .

[0078] like Figure 1-Figure 7As shown, the first valve port A1 of the first valve 181 is connected to the inlet of the first radiator 14, the third valve port A3 of the first valve 181 is connected to the inlet of the first flow path 15, and the fourth valve port A4 of the first valve 181 is connected to the outlet of the mixing device 17; the first valve port B1 of the second valve 182 is connected to the inlet of the second flow path 16, the second valve port B2 of the second valve 182 is connected to the outlet of the second flow path 16, the third valve port B3 of the second valve 182 is connected to the second valve port A2 of the first valve 181, and the fourth valve port B4 of the second valve 182 is connected to the outlet of the first radiator 14.

[0079] In this embodiment, if Figure 1-Figure 7 As shown, the first valve 181 can have four valve ports, and the second valve 182 can have four valve ports, wherein one valve port of the first valve 181 and one valve port of the second valve 182 can be connected to each other, and the other three valve ports of the first valve 181 and the other three valve ports of the second valve 182 can be connected to the inlet and outlet of the first radiator 14, the outlet of the mixing device 17, the inlet of the first flow path 15, and the inlet and outlet of the second flow path 16 respectively. Based on the fact that the inlet of the mixing device 17 is connected to the inlet and outlet of the second path of the evaporator 114, by changing the connection relationship between the four valve ports of the first valve 181 and the four valve ports of the second valve 182, the relationship between the first radiator 14, the second path of the evaporator 114, the first flow path 15, and the second flow path 16 can be changed to achieve a variety of thermal management modes.

[0080] The energy storage system 10 provided in the embodiment of the present application, through the arrangement of the first valve 181 and the second valve 182, utilizes the split design of the two valves, so that after the assembly is completed, the pipelines do not need to be stacked in the same position, which is convenient for relevant operators to identify the pipelines during maintenance and inspection, thereby improving the maintainability of the entire energy storage thermal management system, while reducing the complexity of pipe layout, shortening the working hours required for assembling the valve group 18, and facilitating mass production. At the same time, by controlling the on-off state of each valve port of the third valve and the fourth valve, a variety of thermal management modes are realized, thereby increasing the use width of the energy storage system 10.

[0081] In some embodiments, Figure 1-Figure 8 As shown, the second flow path 16 further includes: a second radiator 162 .

[0082] The second heat sink 162 is connected in series to the first flow path 15 , and an inlet of the second heat sink 162 is connected to an outlet of the heat exchange portion of the electronic device 13 .

[0083] It is understandable that, taking the inverter as an example of the electronic device 13, the operating temperature range and heat dissipation requirements of the energy storage battery 12 and the inverter are different. Specifically, the energy storage battery 12 usually operates best between 20°C and 35°C, while the inverter can operate in a wider temperature range (25°C to 60°C). In the related art, the energy storage battery 12 and the inverter are connected in series in the same circuit and use the same radiator for heat dissipation. In this case, the different heat dissipation requirements of the two cannot be met. For example, if the design of the radiator is mainly based on the heat dissipation requirements of the inverter, the energy storage battery 12 cannot be sufficiently cooled. On the contrary, if the design of the radiator is mainly based on the heat dissipation requirements of the energy storage battery 12, the requirements for the heat exchange capacity of the radiator are more stringent, and a large-scale and more complex radiator needs to be selected, which greatly increases the thermal management cost and maintenance cost of the energy storage system 10, and also seriously affects the energy efficiency ratio of the system.

[0084] In actual implementation, Figure 3 As shown, in the natural cooling mode, the first radiator 14 can dissipate heat for the energy storage battery 12, and the second radiator 162 can dissipate heat for the electronic device 13. The fan speed of the first radiator 14 can be controlled according to the water inlet temperature of the energy storage battery 12, and the fan speed of the second radiator 162 can be controlled according to the water inlet temperature of the electronic device 13. In this way, in the natural cooling mode, the first radiator 14 and the second radiator 162 can respectively cool the energy storage battery 12 and the electronic device 13 independently to meet the different operating temperature requirements of the energy storage battery 12 and the electronic device 13.

[0085] The energy storage system 10 provided in the embodiment of the present application, through the configuration of the above-mentioned second radiator 162, uses corresponding radiators to perform separate heat dissipation for the energy storage battery 12 and the electronic device with different water inlet temperature requirements in the natural cooling mode, thereby reducing the heat exchange capacity requirements of the first radiator 14 and the second radiator 162, significantly reducing the overall energy consumption of the system, and thus effectively reducing the manufacturing cost and maintenance cost. At the same time, the potential of natural heat dissipation is maximized and the highest temperature point of natural heat dissipation is increased.

[0086] In some embodiments, Figure 1-Figure 8 As shown, the energy storage system 10 also includes a heat dissipation fan 22 .

[0087] The energy storage system 10 forms a heat dissipation duct, and the heat dissipation fan 22 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 condenser 112, and the heat dissipation duct is connected to at least one of the gas flow channel of the first radiator 14 and the gas flow channel of the second radiator 162.

[0088] For example, in some embodiments, the heat dissipation air duct is connected to the gas flow channel of the condenser 112, the gas flow channel of the first radiator 14, and the gas flow channel of the second radiator 162, that is, the condenser 112, the first radiator 14, and the second radiator 162 all share the heat dissipation fan 22 for forced air cooling, and the first radiator 14 and the second radiator 162 are placed side by side.

[0089] For example, in some other embodiments, Figure 1-Figure 8 As shown, the heat dissipation air duct is connected to the gas flow channel of the condenser 112 and the gas flow channel of the second radiator 162, that is, the condenser 112 and the second radiator 162 share the heat dissipation fan 22 for forced air cooling.

[0090] For example, in some other embodiments, the heat dissipation air duct is connected to the gas flow channel of the condenser 112 and the gas flow channel of the first radiator 14, that is, the condenser 112 and the first radiator 14 share the heat dissipation fan 22 for forced air cooling.

[0091] Among them, one or more heat dissipation fans 22 can be provided, and more than two means two or more.

[0092] For example, in some embodiments, Figure 1-Figure 8 As shown, one heat dissipation fan 22 is provided.

[0093] In the related art, the condenser 112, the first radiator 14 and the second radiator 162 are usually arranged independently, and the condenser 112, the first radiator 14 and the second radiator 162 each independently exchange heat with the external environment through a fan. However, the use of this solution causes the heat exchange efficiency of the condenser 112, the first radiator 14 and the second radiator 162 to fail to meet expectations, and the number of fans and energy consumption cannot be effectively controlled.

[0094] In actual implementation, taking the case where the heat dissipation duct is connected to the gas flow channel of the condenser 112, the gas flow channel of the first radiator 14, and the gas flow channel of the second radiator 162 as an example, the heat dissipation fan 22 rotates to drive the air flow in the heat dissipation duct to flow rapidly, and the air flow can flow through the gas flow channel of the condenser 112, the gas flow channel of the first radiator 14, the gas flow channel of the second radiator 162, the heat dissipation duct and the heat dissipation fan 22, thereby taking away the heat carried by the first radiator 14 and the second radiator 162, thereby achieving further forced air cooling and heat dissipation of the coolant, and taking away the heat carried by the condenser 112, thereby achieving forced air cooling and heat dissipation of the refrigerant.

[0095] The energy storage system 10 provided in the embodiment of the present application is designed to reduce the number of required fans through the structural design of the condenser 112, the first radiator 14 and the second radiator 162 sharing the heat dissipation fan 22 for air cooling and heat dissipation. Under the premise of controlling production costs, the most concise and efficient air duct structure is achieved, while the smoothness and orderliness of the air duct are improved, and the heat dissipation efficiency of the condenser 112, the first radiator 14 and the second radiator 162 is improved, thereby improving the energy efficiency ratio of the entire energy storage system 10.

[0096] In some embodiments, Figure 1-Figure 8 As shown, the energy storage system 10 further includes a water tank 23 .

[0097] The water tank 23 is connected to the third valve port A3 of the first valve 181 .

[0098] In this embodiment, if Figure 1-Figure 8 As shown, the water tank 23 can be connected to the inlet of the first flow path 15, the exhaust pipe of the water tank 23 can be connected to the outlet of the first flow path 15, and the exhaust pipe of the water tank 23 can be connected to the high point position of the outlet of the first flow path 15 to speed up the exhaust speed of the water tank 23.

[0099] 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 23 and the first flow path 15 through the arrangement of the water tank 23, shortens the water supply path of the water tank 23, improves the water supply efficiency, thereby speeding up the water circulation rate, and further optimizing the heat dissipation effect on the energy storage battery 12, while speeding up the exhaust speed of the water tank 23, preventing the gas from blocking the circulation of the cooling water, and optimizing the cooling effect of the water circulation.

[0100] In some embodiments, Figure 1-Figure 8 As shown, the energy storage system 10 further includes: a heater 19 and a three-way valve 21 .

[0101] The heater 19 is connected in parallel to the second flow path 16; the first valve port C1 of the three-way valve 21 is connected to the first valve port B1 of the second valve 182, the second valve port C2 of the three-way valve 21 is connected to the inlet of the second flow path 16, and the third valve port C3 of the three-way valve 21 is connected to the inlet of the heater 19.

[0102] In actual implementation, Figure 2-Figure 7As shown, in addition to the above-mentioned active cooling mode, natural heat dissipation mode, active temperature equalization mode and waste heat utilization mode, the energy storage system 10 is also configured with an electric heating mode and a hybrid heating mode, considering that the waste heat of the electronic device 13 is not enough to meet the demand in an extremely low temperature environment, the performance of the energy storage battery 12 will be affected, and even cannot work normally. In the electric heating mode, the heater 19 is turned on and the heater 19 can heat the energy storage battery 12; in the hybrid heating mode, the heat provided by the heater 19 alone is still not enough to meet the demand, and the waste heat of the electronic device 13 combined with the heater 19 can heat the energy storage battery 12 together.

[0103] It should be noted that if Figure 5-Figure 7 As shown, to realize the above active cooling mode, natural heat dissipation mode, active temperature equalization mode, waste heat utilization mode, electric heating mode and mixed heating mode, it is necessary to control the on-off state of the three valve ports of the three-way valve 21. Specifically, in the active cooling mode, natural heat dissipation mode, active temperature equalization mode and waste heat utilization mode, the first valve port C1 of the three-way valve 21 is connected with the second valve port C2 of the three-way valve 21; in the electric heating mode, the first valve port C1 of the three-way valve 21 is connected with the third valve port C3 of the three-way valve 21; in the mixed heating mode, the first valve port C1 of the three-way valve 21 is connected with the second valve port C2 of the three-way valve 21 and the third valve port C3 of the three-way valve 21.

[0104] The energy storage system 10 provided in the embodiment of the present application, through the configuration of the above-mentioned heater 19 and the three-way valve 21, arranges the electronic device and the heater in parallel, which can realize the diversion of the coolant and reduce the resistance. At the same time, the energy storage system 10 can provide three heating schemes for selection, namely, heating with waste heat of the electronic device 13, heating with the heater 19, and heating with waste heat of the electronic device 13 combined with heating with the heater 19. Different heating schemes are selected according to actual heat demand, thereby increasing the maximum total heating amount of the entire heating system, enhancing the adaptability of the energy storage system 10 in extremely cold weather, and refining the heating mode.

[0105] 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 first pump 151, the second pump 161 and the first radiator 14 are all working, and the first flow path 15, the second path of the evaporator 114 and the mixing device 17 are connected end to end in sequence; the second flow path 16 and the first radiator 14 are connected end to end.

[0106] In this embodiment, if Figure 2As shown, the first working mode is the above-mentioned active cooling mode. When the energy storage system 10 is switched to the first working mode, the on-off states of the valve ports of the first valve 181 and the second valve 182 are as follows: the first valve port A1 of the first valve 181 is connected to the second valve port A2 of the first valve 181, and the third valve port A3 of the first valve 181 is connected to the fourth valve port A4 of the first valve 181; the first valve port B1 of the second valve 182 is connected to the fourth valve port B4 of the second valve 182, and the second valve port B2 of the second valve 182 is connected to the third valve port B3 of the second valve 182.

[0107] It should be noted that, when the second flow path 16 includes the second radiator 162 , in the first working mode, the second radiator 162 is in the working state.

[0108] The energy storage system 10 provided in the embodiment of the present application, through the design of the above-mentioned first working mode, realizes that when the temperature of the energy storage battery 12 is too high, the refrigeration circuit 11 is used to perform fluorine cooling on the energy storage battery 12, and the first radiator 14 and the second radiator 162 are used to dissipate heat for the electronic device 13, taking into account the heat dissipation requirements of the energy storage battery 12 and the electronic device 13, alleviating a series of domino effects caused by thermal runaway of the energy storage battery 12 due to overheating, thereby extending the working life of the energy storage battery 12.

[0109] In some embodiments, Figure 3 As shown, the energy storage system 10 has a second working mode. In the second working mode, the first pump 151, the second pump 161, the first radiator 14 and the second radiator 162 are all working, the compressor 111 is not working, the first flow path 15, the second path of the evaporator 114, the mixing device 17 and the first radiator 14 are connected end to end in sequence; the second flow path 16 is connected end to end.

[0110] In this embodiment, if Figure 3 As shown, the second working mode is the above-mentioned natural cooling mode. When the energy storage system 10 is switched to the second working mode, the on-off states of the valve ports of the first valve 181 and the second valve 182 are as follows: the first valve port A1 of the first valve 181 is connected to the fourth valve port A4 of the first valve 181, and the second valve port A2 of the first valve 181 is connected to the third valve port A3 of the first valve 181; the first valve port B1 of the second valve 182 is connected to the second valve port B2 of the second valve 182, and the third valve port B3 of the second valve 182 is connected to the fourth valve port B4 of the second valve 182.

[0111] The energy storage system 10 provided in the embodiment of the present application, through the design of the above-mentioned second working mode, realizes that when the temperature of the energy storage battery 12 is high, the first radiator 14 is used to perform air cooling on the energy storage battery 12, thereby meeting the basic heat dissipation requirements of the energy storage battery 12, and preventing the refrigeration system from being started as soon as the energy storage battery 12 is slightly heated, thereby causing unnecessary energy consumption, thereby improving the operating energy efficiency of the entire energy storage system 10 without affecting the performance of the energy storage battery 12 itself, and using the second radiator 162 to perform air cooling on the electronic device 13, thereby realizing independent heat dissipation of the energy storage battery 12 and the electronic device 13 in the second working mode, thereby reducing the heat exchange capacity requirements of the first radiator 14 and the second radiator 162, reducing the overall energy consumption of the system, and thus effectively reducing the manufacturing cost and maintenance cost.

[0112] In some embodiments, Figure 4 As shown, the energy storage system 10 has a third working mode. In the third working mode, the first pump 151 and the second pump 161 are both working, the compressor 111 and the first radiator 14 are not working, the first flow path 15, the second path of the evaporator 114, the mixing device 17 and the first radiator 14 are connected end to end in sequence; the second flow path 16 is connected end to end.

[0113] In this embodiment, if Figure 4 As shown, the third working mode is the above-mentioned active temperature equalization mode. When the energy storage system 10 is switched to the third working mode, the on-off states of the valve ports of the first valve 181 and the second valve 182 are as follows: the first valve port A1 of the first valve 181 is connected to the fourth valve port A4 of the first valve 181, and the second valve port A2 of the first valve 181 is connected to the third valve port A3 of the first valve 181; the first valve port B1 of the second valve 182 is connected to the second valve port B2 of the second valve 182, and the third valve port B3 of the second valve 182 is connected to the fourth valve port B4 of the second valve 182.

[0114] It should be noted that, when the second flow path 16 includes the second radiator 162 , in the third operation mode, the second radiator 162 is in a non-operating state.

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

[0116] In some embodiments, Figure 5As shown, the energy storage system 10 has a fourth working mode. In the fourth working mode, the first pump 151 and the second pump 161 are working, the compressor 111 and the first radiator 14 are not working, and the first flow path 15, the second path of the evaporator 114, the mixing device 17, the first radiator 14 and the second flow path 16 are connected end to end in sequence.

[0117] In this embodiment, if Figure 5 As shown, the fourth working mode is the above-mentioned waste heat utilization mode. When the energy storage system 10 switches to the fourth working mode, the on-off states of the valve ports of the first valve 181 and the second valve 182 are as follows: the first valve port A1 of the first valve 181 is connected to the fourth valve port A4 of the first valve 181, and the second valve port A2 of the first valve 181 is connected to the third valve port A3 of the first valve 181; the first valve port B1 of the second valve 182 is connected to the fourth valve port B4 of the second valve 182, and the second valve port B2 of the second valve 182 is connected to the third valve port B3 of the second valve 182.

[0118] It should be noted that, when the second flow path 16 includes the second radiator 162 , in the fourth operation mode, the second radiator 162 is in a non-operating state.

[0119] The energy storage system 10 provided in the embodiment of the present application, through the design of the above-mentioned fourth working mode, utilizes the waste heat of the electronic device 13 to heat the energy storage battery 12 in a low temperature environment, optimizes the performance of the energy storage battery 12 in a low temperature environment, and extends the service life of the energy storage battery 12. At the same time, no additional energy consumption is required, thereby maximizing the utilization of energy, thereby reducing the overall operating cost of the energy storage system 10.

[0120] In some embodiments, Figure 6 As shown, the energy storage system 10 has a fifth working mode. In the fifth working mode, the first pump 151 and the heater 19 are working, the compressor 111, the second pump 161 and the first radiator 14 are not working, and the first flow path 15, the second path of the evaporator 114, the mixing device 17, the first radiator 14 and the heater 19 are connected end to end in sequence.

[0121] In this embodiment, if Figure 6 As shown, the fifth working mode is the above-mentioned electric heating mode. When the energy storage system 10 is switched to the fifth working mode, the on-off states of the valve ports of the first valve 181 and the second valve 182 are as follows: the first valve port A1 of the first valve 181 is connected to the fourth valve port A4 of the first valve 181, and the second valve port A2 of the first valve 181 is connected to the third valve port A3 of the first valve 181; the first valve port A1 of the second valve 182 is connected to the fourth valve port A4 of the second valve 182, and the second valve port A2 of the second valve 182 is connected to the third valve port A3 of the second valve 182.

[0122] It should be noted that, when the second flow path 16 includes the second radiator 162 , in the fifth operation mode, the second radiator 162 is in a non-operating state.

[0123] The energy storage system 10 provided in the embodiment of the present application, through the design of the fifth working mode, realizes that when the temperature of the energy storage battery 12 is low, the heater 19 is used to heat the energy storage battery 12, so that the temperature of the energy storage battery 12 can be quickly increased to restore the temperature of the energy storage battery 12 to the optimal working range, thereby helping to give full play to the performance of the energy storage battery 12. When the residual heat of the electronic device 13 cannot meet the demand, stable heating guarantee is provided for the energy storage battery 12, thereby enhancing the reliability and stability of the entire energy storage system 10.

[0124] 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 151, the second pump 161 and the heater 19 are working, the compressor 111 and the first radiator 14 are not working, and the first flow path 15, the second path of the evaporator 114, the mixing device 17, the first radiator 14 and the second flow path 16 are connected end to end in sequence.

[0125] In this embodiment, if Figure 7 As shown, the sixth working mode is the above-mentioned mixed heating mode. When the energy storage system 10 switches to the sixth working mode, the on-off status of each valve port of the first valve 181 and the second valve 182 is: the first valve port A1 of the first valve 181 is connected to the fourth valve port A4 of the first valve 181, and the second valve port A2 of the first valve 181 is connected to the third valve port A3 of the first valve 181; the first valve port A1 of the second valve 182 is connected to the fourth valve port A4 of the second valve 182, and the second valve port A2 of the second valve 182 is connected to the third valve port A3 of the second valve 182.

[0126] It should be noted that, when the second flow path 16 includes the second radiator 162 , in the sixth operation mode, the second radiator 162 is in a non-operating state.

[0127] The energy storage system 10 provided in the embodiment of the present application realizes that the waste heat of the electronic device 13 and the heater 19 are combined to heat the energy storage battery 12 in an extremely cold environment through the design of the above-mentioned sixth working mode, which can more efficiently increase the temperature of the energy storage battery 12, so that the energy storage battery 12 can reach a suitable working temperature in a shorter time in an extremely cold environment. When a single heating method may not be able to meet the demand or a failure occurs, the hybrid heating mode provides a backup solution. Even if one of the heating methods fails, the other heating method can still work independently to maintain the normal operation of the energy storage battery 12. At the same time, the existing waste heat resources in the energy storage system 10 are utilized to reduce the dependence on external energy.

[0128] The application also discloses a photovoltaic energy storage system.

[0129] In some embodiments, the photovoltaic energy storage system includes: a photovoltaic power generation system and any one of the energy storage systems 10 described above.

[0130] The photovoltaic power generation system is used to supply power to the energy storage system 10 .

[0131] 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.

[0132] The photovoltaic energy storage system provided in the embodiment of the present application, through the configuration of the above-mentioned energy storage system 10, fully mixes the high-temperature coolant that has not yet entered the evaporator 114 and the low-temperature coolant leaving the evaporator 114, thereby significantly improving the cooling efficiency of the energy storage battery 12, reducing the probability of thermal runaway of the energy storage battery 12 in a high-temperature environment, and thus helping to improve the safety performance of the energy storage battery 12. At the same time, it achieves a uniform distribution of the coolant temperature, improves the uniformity of the coolant temperature supplied to the energy storage battery 12, reduces the temperature gradient between multiple battery cells in the energy storage battery 12, and alleviates the phenomenon of local overheating in the energy storage battery 12 due to heat accumulation, thereby optimizing the performance of the energy storage battery 12 and reducing the energy consumption of the energy storage system 10.

[0133] 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.

[0134] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations 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 referred device or element 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.

[0135] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0136] In the description of the present application, “plurality” means two or more.

[0137] 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.

[0138] 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.

[0139] Other structures of ... according to the embodiments of the present application, such as ... and ..., and operations are known to ordinary technicians in the field and will not be described in detail here.

[0140] 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.

[0141] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An energy storage system, characterized in that: include: a refrigeration circuit, the refrigeration circuit comprising a first circuit of a compressor, a condenser, an expansion valve and an evaporator; An energy storage battery and a first flow path, wherein a heat exchange portion of the energy storage battery is connected to the first flow path, an outlet of the first flow path is connected to an inlet of a second path of the evaporator, and the first flow path includes a first pump; An electronic device and a second flow path, a heat exchange portion of the electronic device is connected to the second flow path, and the second flow path includes a second pump; first radiator; a mixing device, wherein the inlet of the mixing device is connected to the inlet and the outlet of the second path of the evaporator; A valve group, wherein a plurality of valve ports of the valve group are respectively connected to the first flow path, the second flow path, the first radiator and the mixing device, and the plurality of valve ports of the valve group can be selectively opened and closed.

2. The energy storage system according to claim 1, characterized in that: The mixing device comprises a static mixer.

3. The energy storage system according to claim 1, characterized in that: The valve group includes first to sixth valve ports, the first valve port of the valve group is connected to the outlet of the first radiator, the second valve port of the valve group is connected to the inlet of the first radiator, the third valve port of the valve group is connected to the outlet of the mixing device, the fourth valve port of the valve group is connected to the inlet of the first flow path, the fifth valve port of the valve group is connected to the outlet of the second flow path, and the sixth valve port of the valve group is connected to the inlet of the second flow path.

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

5. The energy storage system according to claim 4, characterized in that: The second flow path further comprises: A second radiator is connected in series to the first flow path, and an inlet of the second radiator is connected to an outlet of the heat exchange portion of the electronic device.

6. The energy storage system according to claim 5, characterized in that: Also includes: A heat dissipation fan, wherein the energy storage system forms a heat dissipation duct, and 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 condenser, and the heat dissipation duct is connected to at least one of the gas flow channel of the first radiator and the gas flow channel of the second radiator.

7. The energy storage system according to claim 4, characterized in that: Also includes: A water tank is connected to the third valve port of the first valve.

8. The energy storage system according to claim 4, characterized in that: Also includes: a heater connected in parallel to the second flow path; A three-way valve, wherein a first valve port of the three-way valve is connected to a first valve port of the second valve, a second valve port of the three-way valve is connected to an inlet of the second flow path, and a third valve port of the three-way valve is connected to an inlet of the heater.

9. The energy storage system according to any one of claims 1 to 8, characterized in that: The energy storage system has a first operating mode. In the first operating mode, the compressor, the first pump, the second pump and the first radiator are all operating, the first flow path, the second path of the evaporator and the mixing device are connected end to end in sequence; the second flow path and the first radiator are connected end to end.

10. The energy storage system according to claim 5, characterized in that: The energy storage system has a second operating mode. In the second operating mode, the first pump, the second pump, the first radiator and the second radiator are all working, the compressor is not working, the first flow path, the second path of the evaporator, the mixing device and the first radiator are connected end to end in sequence; the second flow path is connected end to end.

11. The energy storage system according to any one of claims 1 to 8, characterized in that: The energy storage system has a third working mode. In the third working mode, the first pump and the second pump are both working, the compressor and the first radiator are both not working, the first flow path, the second path of the evaporator, the mixing device and the first radiator are connected end to end in sequence; the second flow path is connected end to end.

12. The energy storage system according to any one of claims 1 to 8, characterized in that: The energy storage system has a fourth operating mode. In the fourth operating mode, the first pump and the second pump are working, the compressor and the first radiator are not working, and the first flow path, the second path of the evaporator, the mixing device, the first radiator and the second flow path are connected end to end in sequence.

13. The energy storage system according to claim 8, characterized in that: The energy storage system has a fifth operating mode. In the fifth operating mode, the first pump and the heater are working, the compressor, the second pump and the first radiator are not working, and the first flow path, the second path of the evaporator, the mixing device, the first radiator and the heater are connected end to end in sequence.

14. The energy storage system according to claim 8, characterized in that: The energy storage system has a sixth operating mode. In the sixth operating mode, the first pump, the second pump and the heater are working, the compressor and the first radiator are not working, and the first flow path, the second path of the evaporator, the mixing device, the first radiator and the second flow path are connected end to end in sequence.

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

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