Energy storage system and photovoltaic energy storage system

Abstract

The utility model 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; the first flow path communicates with the heat exchange part of the energy storage battery and is connected with the second path of the evaporator; the second flow path is communicated with the heat exchange part of the electronic device and is connected with the first flow path in parallel; the first cooling passage is connected in parallel with the second flow path and comprises a first radiator; the second cooling passage is connected in parallel with the second flow path and comprises a second radiator; first to third valve ports of the three-way valve are respectively connected to the first flow path, the first cooling passage and the second flow path; the pipeline inner diameter phi 1 matched with the first flow path, the second flow path, the second path of the evaporator and the first cooling passage, and the pipeline inner diameter phi 2 matched with the second cooling passage meet phi 1gt; phi 2. Through the differentiated design of the inner diameter of the water side pipeline, the heat dissipation requirements of the energy storage battery and the electronic device are considered.

Description

TECHNICAL FIELD

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

[0002] In the energy storage system, the energy storage battery and the electronic device as key components will generate a large amount of heat in the working process, and effective heat dissipation measures are needed to ensure the stable operation of the system. However, the energy storage battery has a high energy density and a large working power, and its heat dissipation demand is often much greater than that of the electronic device.

[0003] In the related art, the traditional energy storage system often adopts a unified cooling strategy, which cannot accurately adjust according to the different heat dissipation demands of the energy storage battery and the electronic device. This leads to the fact that either the energy storage battery cannot be sufficiently cooled, affecting the service life and performance of the energy storage battery, or the electronic device is over-cooled, causing energy waste. CONTENT OF THE INVENTION

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides an energy storage system and a photovoltaic energy storage system, which take into account the heat dissipation demands of the energy storage battery and the electronic device.

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

[0006] A refrigeration circuit comprising a compressor, a condenser and an evaporation flow path, the evaporation flow path comprising a first path of an expansion valve and an evaporator connected in series;

[0007] An energy storage battery and a first flow path, a heat exchange part of the energy storage battery being communicated with the first flow path, the first flow path comprising a first pump and being connected with a second path of the evaporator;

[0008] An electronic device and a second flow path, a heat exchange part of the electronic device being communicated with the second flow path, the second flow path comprising a second pump and being connected in parallel with the first flow path;

[0009] A first cooling passage connected in parallel with the second flow path and comprising a first heat sink;

[0010] A second cooling passage connected in parallel with the second flow path and comprising a second heat sink;

[0011] A three-way valve, a first valve port of the three-way valve being connected to an outlet of the first flow path, a second valve port of the three-way valve being connected to an inlet of the first cooling passage, and a third valve port of the three-way valve being connected to an outlet of the second flow path; wherein,

[0012] The inner diameters of the pipes matched with the first flow path, the second flow path, the second path of the evaporator and the first cooling passage are Φ1, and the inner diameter of the pipe matched with the second cooling passage is Φ2, and Φ1>Φ2 is satisfied.

[0013] According to the energy storage system, the inner diameters of the water-side pipes are designed differently, so that the amount of cooling liquid passing through the energy storage battery per unit time is greater than the amount of cooling liquid passing through the electronic device per unit time in the natural cooling mode, the heat dissipation requirements of the energy storage battery and the electronic device are considered, the energy storage battery is sufficiently cooled, the situation that the electronic device is excessively cooled is effectively avoided, the energy utilization efficiency is greatly improved, the heat dissipation capacity of the first heat sink and the second heat sink is fully utilized in the active refrigeration mode, the defect that the heat dissipation capacity of a single heat sink is insufficient is compensated, and the use width of the electronic device is increased.

[0014] According to an embodiment of the present application, Φ1 and Φ2 satisfy 2≤Φ1 / Φ2≤10.

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

[0016] A stop valve is arranged between the first flow path and the second path of the evaporator.

[0017] According to an embodiment of the present application, a plurality of evaporative flow paths are arranged, the plurality of evaporative flow paths are connected in parallel, and the first flow path is connected with the second paths of the plurality of evaporators.

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

[0019] A heater is connected between the first flow path and the second path of the evaporator.

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

[0021] A water tank is provided, an air inlet of the water tank is selectively communicated with the first flow path, and a liquid supplementing port is arranged at at least one of the first flow path and the second flow path.

[0022] According to an embodiment of the present application, the energy storage system has a first working mode, in which the compressor, the first pump, the second pump, the first heat sink and the second heat sink work, the second path of the evaporator and the first flow path are connected end to end, the first cooling passage and the second flow path are connected end to end, and the second cooling passage and the second flow path are connected end to end.

[0023] According to an embodiment of the present application, the energy storage system has a second working mode, in which the first pump, the second pump, the first radiator and the second radiator are working, the compressor is stopped, the first flow path and the first cooling path are connected in series, and the second flow path and the second cooling path are connected in series.

[0024] According to an embodiment of the present application, the energy storage system has a third working mode, in which the first pump and the second pump are working, the compressor, the first radiator and the second radiator are stopped, the compressor is stopped, the first flow path and the first cooling path are connected in series, and the second flow path and the second cooling path are connected in series.

[0025] According to an embodiment of the present application, the energy storage system has a fourth working mode, in which the heater, the first pump and the second pump are working, the compressor, the first radiator and the second radiator are stopped, the heater, the second path of the evaporator and the first flow path are connected in series, the first cooling path and the second flow path are connected in series, and the second cooling path and the second flow path are connected in series.

[0026] According to an embodiment of the present application, the energy storage system has a fifth working mode, in which the first pump and the second pump are working, the compressor, the first radiator and the second radiator are stopped, the second path of the evaporator and the first flow path are connected in series, the first cooling path and the first flow path are connected in series, the first cooling path and the second flow path are connected in series, the second cooling path and the second flow path are connected in series, and the air inlet of the water tank is communicated with the first flow path.

[0027] In a second aspect, the present application provides an energy storage system, comprising:

[0028] the energy storage system of any one of the above;

[0029] a photovoltaic power generation system for supplying power to the energy storage system.

[0030] According to the photovoltaic energy storage system of the present application, through the arrangement of the energy storage system, the amount of cooling liquid passing through the energy storage battery per unit time is more than the amount of cooling liquid passing through the electronic device per unit time in the natural cooling mode, the heat dissipation requirements of the energy storage battery and the electronic device are considered, the energy storage battery is sufficiently cooled, the situation that the electronic device is excessively cooled is effectively avoided, the energy utilization efficiency is greatly improved, and in the active refrigeration mode, the heat dissipation capacity of the first heat sink and the second heat sink is fully utilized, the defect that the heat dissipation capacity of a single heat sink is insufficient is compensated, and the use width of the electronic device is increased.

[0031] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0032] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0033] Figure 1 is a structural schematic diagram of an energy storage system provided by an embodiment of the present application;

[0034] Figure 2 is a structural schematic diagram of an energy storage system in a first working mode and a fourth working mode provided by an embodiment of the present application;

[0035] Figure 3 is a structural schematic diagram of an energy storage system in a second working mode and a third working mode provided by an embodiment of the present application;

[0036] Figure 4 is a structural schematic diagram of an energy storage system in a fifth working mode provided by an embodiment of the present application.

[0037] Reference signs:

[0038] Energy storage system 10, three-way valve 101, stop valve 102;

[0039] Refrigeration circuit 11, compressor 111, condenser 112, evaporation flow path 113, expansion valve 1131, evaporator 1132;

[0040] Energy storage battery 12;

[0041] First flow path 13, first pump 131;

[0042] Electronic device 14;

[0043] Second flow path 15, second pump 151;

[0044] First cooling passage 16, first heat sink 161;

[0045] the second cooling passage 17, the first radiator 171;

[0046] the heater 18, the water tank 19. DETAILED DESCRIPTION

[0047] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0048] The present application provides an energy storage system 10.

[0049] Reference is made below Figures 1-4 An energy storage system 10 according to an embodiment of the present application is described.

[0050] In some embodiments, as Figure 1 shown, the energy storage system 10 includes a refrigeration circuit 11, an energy storage battery 12, a first flow path 13, electronic devices 14, a second flow path 15, a first cooling passage 16, a second cooling passage 17, and a three-way valve 101.

[0051] The refrigeration circuit 11 includes a compressor 111, a condenser 112, and an evaporative flow path 113 including a first path of an expansion valve 1131 and an evaporator 1132 connected in series; a heat exchange part of the energy storage battery 12 is communicated with the first flow path 13, the first flow path 13 includes a first pump 131, and is connected with a second path of the evaporator 1132; a heat exchange part of the electronic devices 14 is communicated with the second flow path 15, the second flow path 15 includes a second pump 151, and the second flow path 15 is connected in parallel with the first flow path 13; the first cooling passage 16 is connected in parallel with the second flow path 15, and the first cooling passage 16 includes a first radiator 161; the second cooling passage 17 is connected in parallel with the second flow path 15, and the second cooling passage 17 includes a second radiator; a first valve port A1 of the three-way valve 101 is connected to an outlet of the first flow path 13, a second valve port A2 of the three-way valve 101 is connected to an inlet of the first cooling passage 16, and a third valve port A3 of the three-way valve 101 is connected to an outlet of the second flow path 15; wherein the inner diameters of the pipes matched with the first flow path 13, the second flow path 15, the second path of the evaporator 1132, and the first cooling passage 16 are Φ1, the inner diameter of the pipe matched with the second cooling passage 17 is Φ2, and Φ1>Φ2 is satisfied.

[0052] As shown in Figures 1-4 , the cooling liquid can exchange heat with the energy storage battery 12 through the first flow path 13 to achieve thermal management of the energy storage battery 12; the cooling liquid can exchange heat with the electronic devices 14 through the second flow path 15 to achieve thermal management of the electronic devices 14.

[0053] It should be noted that the electronic device 14 can be a high-heat-generating device within the energy storage system 10. Specifically, the electronic device 14 can include, but is not limited to, power conversion components, communication modules, detection modules, or interaction modules, etc., without any restrictions here.

[0054] For example, in some embodiments, the electronic device 14 is a power conversion component.

[0055] The first radiator 161 and the second radiator can be either radiative radiators or convection radiators, depending on the system requirements and design requirements, and no restrictions are imposed here.

[0056] In this embodiment, the first radiator 161 and the second radiator share the same fan for air cooling.

[0057] In other embodiments, the first radiator 161 and the second radiator use different fans for independent air cooling.

[0058] In this embodiment, such as Figures 1-3 As shown, the energy storage system 10 can be configured with multiple thermal management modes. Each thermal management mode has a different temperature control method for the energy storage battery 12 and the electronic device 14. The multiple thermal management modes may include, but are not limited to: First, in the active cooling mode, the evaporator 1132 of the cooling circuit 11 can dissipate heat from the energy storage battery 12, while the first heat sink 161 and the second heat sink work together to dissipate heat from the electronic device 14; Second, in the natural cooling mode, the first heat sink 161 dissipates heat from the energy storage battery 12, and the second heat sink dissipates heat from the electronic device 14; Third, in the active temperature equalization mode, the coolant is driven to circulate to promote internal temperature equalization of the energy storage battery 12 and the electronic device 14.

[0059] Understandably, the operating temperature range and heat dissipation requirements of the energy storage battery 12 and the electronic device 14 are different. Specifically, the heat dissipation requirements of the energy storage battery 12 are often much greater than those of the electronic device 14. Therefore, the amount of coolant required by the energy storage battery 12 for heat dissipation is also much greater than that required by the electronic device 14. Taking the electronic device 14 as an inverter as an example, the energy storage battery 12 typically operates optimally between 20°C and 35°C, while the inverter can operate over a wider temperature range (25°C to 60°C).

[0060] In actual implementation, based on Φ1>Φ2, in other words, among all the water-side pipes, the inner diameter of the pipe matched with the second cooling passage 17 is smaller than the inner diameter of the other pipes, in the production and manufacturing, the water-side pipes can include two types of water pipes, specifically, the pipes matched with the first flow passage 13, the second flow passage 15, the second passage of the evaporator 1132 and the first cooling passage 16 can use the first type of water pipe, and the pipe matched with the second cooling passage 17 can use the second type of water pipe, the inner diameter of the first type of water pipe is larger than the inner diameter of the second type of water pipe, so as to achieve the purpose that the pipe resistance of the first flow passage 13, the second flow passage 15, the second passage of the evaporator 1132 and the first cooling passage 16 is larger than the pipe resistance of the second cooling passage 17. Correspondingly, in order to realize the assembly connection between the water-side pipes, two types of joints can be used, specifically, the joint connected between the pipes matched with the first flow passage 13, the second flow passage 15, the second passage of the evaporator 1132 and the first cooling passage 16 adopts the first type, and the joint connected between the pipe matched with the second cooling passage 17 and the other pipes adopts the second type, all the interfaces of the first type of joint match the first type of water pipe, and the second type of joint includes part of the interfaces matching the first type of water pipe and another part of the interfaces matching the second type of water pipe. In this case, when the energy storage system 10 switches to the natural cooling mode, the amount of cooling liquid passing through the energy storage battery 12 per unit time is more than the amount of cooling liquid passing through the electronic device 14 per unit time, the larger Φ1 allows a higher flow rate, which helps to quickly take away heat from the energy storage battery 12 and improve the heat dissipation efficiency, and the smaller Φ2 enhances the heat exchange efficiency between the cooling liquid and the second heat sink by increasing the flow rate and the degree of turbulence, so that the heat dissipation demand of the electronic device 14 can be met although the flow rate is small.

[0061] The energy storage system 10 provided by the embodiment of the present application realizes that the amount of cooling liquid passing through the energy storage battery 12 per unit time is more than the amount of cooling liquid passing through the electronic device 14 per unit time in the natural cooling mode by differentiating the inner diameter of the water-side pipes, and the heat dissipation demands of the energy storage battery 12 and the electronic device 14 are considered, so that the energy storage battery 12 is sufficiently cooled, the situation that the electronic device 14 is excessively cooled is effectively avoided, the energy utilization efficiency is greatly improved, and the heat dissipation capacity of the first heat sink 161 and the second heat sink is fully utilized in the active refrigeration mode, so as to make up for the defect that the heat dissipation capacity of a single heat sink is insufficient, thereby increasing the use width of the electronic device 14.

[0062] In some embodiments, Φ1 and Φ2 satisfy: 2≤Φ1 / Φ2≤10.

[0063] Specifically, Φ1 / Φ2 can be 2, 3.2, 4.75, 6, 8.251, 9.6, 10, or other values between 2 and 10, which are not limited here.

[0064] Exemplarily, the inner diameter Φ1 of the pipeline matched by the first flow path 13, the second flow path 15, the second path of the evaporator 1132, and the first cooling passage 16 is 38 mm, and the inner diameter Φ2 of the pipeline matched by the second cooling passage 17 is 8 mm.

[0065] The energy storage system 10 provided by the embodiment of the present application can accurately control the flow rate of the cooling liquid flowing through the energy storage battery 12 and the electronic device 14 by limiting the range of Φ1 / Φ2 as described above, and the accurate flow rate distribution can make the energy storage system 10 more efficiently utilize the cooling liquid, reduce unnecessary energy loss, thereby reducing the operation cost of the energy storage system 10, and also help to maintain the stability of the internal temperature of the energy storage system 10, reduce the performance change caused by temperature fluctuation, thereby prolonging the service life of the energy storage battery 12 and the electronic device 14, and further improving the reliability and stability of the entire energy storage system 10.

[0066] In some embodiments, as shown in Figures 1-4 The energy storage system 10 further comprises a stop valve 102.

[0067] The stop valve 102 is arranged between the first flow path 13 and the second path of the evaporator 1132.

[0068] In this embodiment, the stop valve 102 can be used to control the on-off between the first flow path 13 and the second path of the evaporator 1132, and when the energy storage system 10 switches to the natural cooling mode, the stop valve 102 can be in a closed state, that is, the first flow path 13 and the second path of the evaporator 1132 are disconnected, so that the cooling liquid leaving the energy storage battery 12 can all enter the first radiator 161 for large-scale heat dissipation and cooling.

[0069] The energy storage system 10 provided by the embodiment of the present application realizes the disconnection between the first flow path 13 and the second path of the evaporator 1132 in the natural cooling mode by the arrangement of the stop valve 102, increases the heat exchange amount of the first radiator 161, thereby improving the heat dissipation efficiency of the first radiator 161, and further optimizing the heat dissipation effect of the first radiator 161 on the energy storage battery 12.

[0070] It should be noted that, in the case where the energy storage system 10 does not include the stop valve 102, the first flow path 13 and the second path of the evaporator 1132 are in an open state in all heat management modes, wherein, when the energy storage system 10 switches to the natural cooling mode described above, part of the cooling liquid leaving the energy storage battery 12 can enter the second path of the evaporator 1132, and the other part can enter the first heat sink 161 to dissipate heat and cool. Compared with the above-mentioned scheme of setting the stop valve 102, although the liquid cooling effect is slightly weakened, the production cost is reduced. In actual application, users can comprehensively consider the cost and heat dissipation demand to select the appropriate scheme.

[0071] In some embodiments, as shown in FIG. 1, the evaporative flow path 113 is provided in multiple, and the multiple evaporative flow paths 113 are connected in parallel, and the first flow path 13 is connected with the second paths of the multiple evaporators 1132. Figures 1-4

[0072] Among them, multiple means two or more than two.

[0073] For example, in some embodiments, as shown in FIG. 1, the evaporative flow path 113 is provided in two, and the two evaporative flow paths 113 are connected in parallel, and the first flow path 13 is connected with the second paths of the two evaporators 1132. Figures 1-4

[0074] For example, in some other embodiments, the evaporative flow path 113 is provided in three, and the three evaporative flow paths 113 are connected in parallel, and the first flow path 13 is connected with the second paths of the three evaporators 1132.

[0075] In the related art, in the current energy storage system, the refrigerant circuit is usually combined with the liquid cooling circuit to manage the heat of the energy storage battery and other heat generating devices, and the refrigerant circuit exchanges heat with the liquid cooling circuit through the evaporator. However, in actual application, the evaporator is limited by its capacity and cannot directly handle all cooling liquid flow, resulting in low refrigeration efficiency, and the energy storage battery is difficult to dissipate heat in a short time to return to the normal working temperature, which seriously affects the working life of the energy storage battery.

[0076] It can be understood that, as shown in FIG. 1, Figure 2 ​​As shown, since multiple evaporation flow paths 113 are provided and connected in parallel, in active cooling mode, the first flow path 13 is connected to the second path of multiple evaporators 1132. In this way, a large amount of coolant can be diverted to the second path of multiple evaporators 1132. Each evaporator 1132 only needs to process a portion of the coolant, and the heat dissipation of each evaporator 1132 can be carried out simultaneously. The low-temperature coolant after being cooled by multiple evaporators 1132 is combined and sent to the heat exchange section of the energy storage battery 12 to quickly cool the energy storage battery 12 in high-temperature environment, so as to shorten the time that the energy storage battery 12 is in an over-temperature state as much as possible, thereby extending the service life of the energy storage battery 12.

[0077] In some embodiments, such as Figures 1-4 As shown, the energy storage system 10 also includes a heater 18.

[0078] The heater 18 is connected between the first flow path 13 and the second flow path of the evaporator 1132.

[0079] In actual implementation, such as Figure 2 As shown, in addition to the above-mentioned active cooling mode, natural heat dissipation mode and active temperature equalization mode, the energy storage system 10 is also equipped with an electric heating mode, considering that the performance and service life of the energy storage battery 12 will be severely affected in a low-temperature environment. In the electric heating mode, the heater 18 is turned on, and the heater 18 can heat the energy storage battery 12. At this time, the electronic device 14 can use the low-temperature environment for natural heat dissipation.

[0080] The energy storage system 10 provided in this application embodiment, through the setting of the heater 18, meets the heating requirements of the energy storage battery 12 in low-temperature environment, optimizes the performance of the energy storage battery 12 in low-temperature environment, and thus extends the service life of the energy storage battery 12.

[0081] In some embodiments, such as Figures 1-4 As shown, the energy storage system 10 also includes a water tank 19.

[0082] The air inlet of the water tank 19 can be selectively connected to the first flow path 13, and at least one of the first flow path 13 and the second flow path 15 is provided with a liquid replenishment port.

[0083] Both the replenishment port and the vent port can be located in the first flow path 13. Specifically, the water tank 19 passes through... Figure 1 The dashed line connects to the exhaust port on the first flow path 13. The exhaust port is located between the inlet of the heater 18 and the outlet of the heat exchange section of the energy storage battery 12. The liquid replenishment port is located near the outlet of the heat exchange section of the energy storage battery 12. For example, the liquid replenishment port can be located between the exhaust port and the outlet of the heat exchange section of the energy storage battery 12.

[0084] In actual implementation, in addition to being configured with the active refrigeration mode, the natural heat dissipation mode, the active temperature equalization mode and the electric heating mode, the energy storage system 10 can also be configured with a liquid supplementing and exhaust mode. In the liquid supplementing and exhaust mode, the liquid supplementing port and the exhaust port are turned on, and the water tank 19 can supplement the cooling liquid and discharge the internal gas during the circulation of the cooling liquid.

[0085] The energy storage system 10 provided by the embodiments of the present application realizes the water path communication and the gas path communication between the water tank 19 and the first flow path 13 through the arrangement of the water tank 19, shortens the water supply path of the water tank 19, improves the water supply efficiency, thereby accelerating the water circulation rate, and further optimizes the heat dissipation effect on the energy storage battery 12, while accelerating the exhaust speed of the water tank 19, preventing the gas from blocking the circulation of the cooling water, and optimizing the cooling effect of the water circulation.

[0086] In some embodiments, as shown in Figure 2 , the energy storage system 10 has a first working mode. In the first working mode, the compressor 111, the first pump 131, the second pump 151, the first radiator 161 and the second radiator work, the second path of the evaporator 1132 and the first flow path 13 are connected end to end, the first cooling passage 16 and the second flow path 15 are connected end to end, and the second cooling passage 17 and the second flow path 15 are connected end to end.

[0087] In this embodiment, as shown in Figure 2 , the first working mode is the active refrigeration mode. When the energy storage system 10 is switched to the first working mode, the on-off state of each valve port of the three-way valve 101 is as follows: the second valve port A2 is in communication with the third valve port A3, and the first valve port A1 is disconnected from the second valve port A2 and the third valve port A3. The cooling liquid circulates between the second path of the evaporator 1132 and the first flow path 13 to realize the fluorine cooling heat dissipation of the energy storage battery 12 by the refrigeration circuit 11 in a high temperature environment. The high temperature cooling liquid leaving the heat exchange part of the electronic device 14 can be respectively split into the first cooling passage 16 and the second cooling passage 17, and the two low temperature cooling liquids after heat dissipation are combined and sent back to the heat exchange part of the electronic device 14 to realize the forced air cooling heat dissipation of the electronic device 14 by the first radiator 161 and the second radiator.

[0088] It should be noted that, as shown in Figure 2 , in the case where the energy storage system 10 includes the stop valve 102, in the first working mode, the stop valve 102 is in an open state.

[0089] The energy storage system 10 provided by the embodiments of the present application realizes fluorine cooling heat dissipation of the energy storage battery 12 by the first working mode, and simultaneously realizes heat dissipation of the electronic device 14 by the first heat sink 161 and the second heat sink, so as to meet the heat dissipation requirements of the energy storage battery 12 and the electronic device 14, relieve a series of domino effects of thermal runaway of the energy storage battery 12 due to over-temperature, thereby prolonging the service life of the energy storage battery 12, and fully exerting the heat dissipation capacity of the first heat sink 161 and the second heat sink, thereby increasing the use width of the electronic device 14.

[0090] In some embodiments, as shown in Figure 3 The energy storage system 10 has a second working mode, in which the first pump 131, the second pump 151, the first heat sink 161 and the second heat sink work, the compressor 111 is stopped, and the first flow path 13 and the first cooling passage 16 are connected in series, and the second flow path 15 and the second cooling passage 17 are connected in series.

[0091] In this embodiment, as shown in Figure 3 The second working mode is the natural cooling mode, and when the energy storage system 10 switches to the second working mode, the on-off state of each valve port of the three-way valve 101 is that the first valve port A1 is in communication with the second valve port A2, and the third valve port A3 is disconnected with the first valve port A1 and the second valve port A2. The cooling liquid circulates between the first cooling passage 16 and the first flow path 13 to realize forced air cooling heat dissipation of the first heat sink 161 to the energy storage battery 12 in a high-temperature environment. The cooling liquid circulates between the second cooling passage 17 and the second flow path 15 to realize forced air cooling heat dissipation of the second heat sink to the electronic device 14.

[0092] It should be noted that, as shown in Figure 3 In the first working mode, the stop valve 102 is in a closed state.

[0093] The energy storage system 10 provided by the embodiments of the present application realizes fluorine cooling heat dissipation of the energy storage battery 12 by the first working mode, and simultaneously realizes heat dissipation of the electronic device 14 by the first heat sink 161 and the second heat sink, so as to meet the heat dissipation requirements of the energy storage battery 12 and the electronic device 14, relieve a series of domino effects of thermal runaway of the energy storage battery 12 due to over-temperature, thereby prolonging the service life of the energy storage battery 12, and fully exerting the heat dissipation capacity of the first heat sink 161 and the second heat sink, thereby increasing the use width of the electronic device 14.

[0094] In some embodiments, as shown in Figure 3As shown, the energy storage system 10 has a third working mode, in which the first pump 131 and the second pump 151 work, the compressor 111, the first radiator 161 and the second radiator are stopped, the compressor 111 is stopped, the first flow path 13 and the first cooling passage 16 are connected in series, and the second flow path 15 and the second cooling passage 17 are connected in series.

[0095] In this embodiment, as shown Figure 3 The third working mode is the active temperature equalization mode described above. When the energy storage system 10 switches to the third working mode, the on-off state of each valve port of the three-way valve 101 is as follows: the first valve port A1 communicates with the second valve port A2, and the third valve port A3 is disconnected from the first valve port A1 and the second valve port A2. The cooling liquid circulates between the first cooling passage 16 and the first flow path 13, and circulates between the second cooling passage 17 and the second flow path 15, so as to realize temperature uniformity of each part of the water side circuit.

[0096] It should be noted that, as shown Figure 3 In the case where the energy storage system 10 includes the stop valve 102, in the first working mode, the stop valve 102 can be in a closed state.

[0097] The energy storage system 10 provided by the embodiments of the present application actively equalizes the temperature of the water side circuit of the entire energy storage system 10 by the design of the third working mode described above, and considers that the heat dissipation pressure is small at this time, without the need for additional heat dissipation configuration, which improves the temperature uniformity of the plurality of battery monomers in the energy storage battery 12, and improves the temperature uniformity of the entire energy storage system 10 in the case where the ambient temperature is moderate.

[0098] In some embodiments, as shown Figure 2 The energy storage system 10 has a fourth working mode, in which the heater 18, the first pump 131 and the second pump 151 work, the compressor 111, the first radiator 161 and the second radiator are stopped, the heater 18, the second path of the evaporator 1132 and the first flow path 13 are connected in series, the first cooling passage 16 and the second flow path 15 are connected in series, and the second cooling passage 17 and the second flow path 15 are connected in series.

[0099] In this embodiment, as shown Figure 2As shown (the bolded section in the figure illustrates the flow path of the cooling liquid), the fourth working mode is the above-mentioned electric heating mode. When the energy storage system 10 switches to the fourth working mode, the on-off state of each valve port of the three-way valve 101 is as follows: the second valve port A2 is in communication with the third valve port A3, and the first valve port A1 is disconnected from the second valve port A2 and the third valve port A3. The high-temperature cooling liquid heated by the heater 18 can flow to the heat exchange part of the energy storage battery 12 to heat the energy storage battery 12 in a low-temperature environment. The cooling liquid circulates and flows in the first cooling passage 16, the second cooling passage 17, and the second flow path 15 to achieve natural air cooling heat dissipation of the electronic device 14 in a low-temperature environment.

[0100] It should be noted that, as Figure 2 shown, in the case where the energy storage system 10 includes the stop valve 102, in the first working mode, the stop valve 102 is in an open state.

[0101] The energy storage system 10 provided by the embodiments of the present application realizes heating of the energy storage battery 12 by the heater 18 in the case where the temperature of the energy storage battery 12 is relatively low through the design of the fourth working mode, can rapidly increase the temperature of the energy storage battery 12, and restores the temperature of the energy storage battery 12 to the optimal working interval, thereby helping to fully exert the performance of the energy storage battery 12 and further prolonging the service life of the energy storage battery 12.

[0102] In some embodiments, as Figure 4 shown, the energy storage system 10 has a fifth working mode. In the fifth working mode, the first pump 131 and the second pump 151 work, the compressor 111, the first heat sink 161, and the second heat sink are stopped, the second path of the evaporator 1132 and the first flow path 13 are connected end to end, the first cooling passage 16 and the first flow path 13 are connected end to end, the first cooling passage 16 and the second flow path 15 are connected end to end, the second cooling passage 17 and the second flow path 15 are connected end to end, and the air inlet of the water tank 19 is in communication with the first flow path 13.

[0103] In this implementation, as Figure 4 shown (the bolded section in the figure illustrates the flow path of the cooling liquid), the fifth working mode is the above-mentioned liquid supplementing and gas discharging mode. When the energy storage system 10 switches to the fifth working mode, the on-off state of each valve port of the three-way valve 101 is as follows: the first valve port A1, the second valve port A2, and the third valve port A3 are in communication with each other. The added cooling liquid can enter the first flow path 13 from the liquid supplementing port, and then circulate and flow back and forth in the second path of the evaporator 1132, the first flow path 13, the second flow path 15, the first cooling passage 16, and the second cooling passage 17. With the flow of the added cooling liquid, the excess gas in the water side pipeline can also be discharged into the water tank 19 through the gas discharge port and finally discharged from the gas outlet of the water tank 19.

[0104] It should be noted that, as Figure 4 As shown, when the energy storage system 10 includes a shut-off valve 102, in the first operating mode, the shut-off valve 102 is in the open state.

[0105] The energy storage system 10 provided in this application embodiment, through the design of the fifth working mode described above, realizes the replenishment of coolant in the water-side flow path and the timely discharge of exhaust gas, so that the cooling water in the energy storage system 10 is always kept at a suitable level, reducing the probability of system overheating or other operational problems caused by insufficient cooling water, thereby effectively transferring heat from the energy storage battery 12 and electronic device 14 to the first radiator 161 and the second radiator. At the same time, exhausting the exhaust gas can eliminate air bubbles in the water-side flow path, preventing the increase of thermal resistance due to air bubbles blocking the pipes, thereby improving the overall cooling efficiency of the system. Furthermore, timely replenishment of coolant and exhausting the exhaust gas can reduce corrosion and deposits in the system, keep the pipes clean, and thus reduce the maintenance frequency of the water-side pipeline.

[0106] This application also provides a photovoltaic energy storage system.

[0107] In some embodiments, the photovoltaic energy storage system includes a photovoltaic power generation system and an energy storage system 10 as described above.

[0108] The photovoltaic power generation system is used to supply power to the energy storage system 10.

[0109] 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.

[0110] The photovoltaic energy storage system provided in this application embodiment, through the configuration of the energy storage system 10, achieves that in the natural cooling mode, the amount of coolant passing through the energy storage battery 12 per unit time is greater than the amount of coolant passing through the electronic device 14 per unit time, taking into account the heat dissipation needs of both the energy storage battery 12 and the electronic device 14, so that the energy storage battery 12 is sufficiently cooled, while effectively avoiding the situation of the electronic device 14 being overcooled, greatly improving energy utilization efficiency. Furthermore, in the active cooling mode, it fully utilizes the heat dissipation capacity of the first heat sink 161 and the second heat sink, making up for the deficiency of insufficient heat dissipation of a single heat sink, thereby increasing the usability of the electronic device 14.

[0111] 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 particular order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a class, and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in a "or" relationship.

[0112] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0113] In the description of the present application, "first feature" and "second feature" can include one or more of the features.

[0114] In the description of the present application, "a plurality of" means two or more.

[0115] In the description of the present application, "above", "over" and "on" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them.

[0116] In the description of the present application, "above", "over" and "on" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height.

[0117] Other configurations of … according to embodiments of the present application, such as … and …, and operations are known to those of ordinary skill in the art, and are not described in detail here.

[0118] In the description of the application, reference has been made to descriptive terms such as "one embodiment", "some embodiments", "an embodiment", "example", "specific example" or "some examples" etc. It is emphasized that each of these terms refers to a specific feature, structure, material or characteristic described in connection with a particular embodiment or example. The descriptive terms are not necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0119] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since the scope of the application is defined with respect to the appended claims.

Claims

1. An energy storage system, characterized in that, include: A refrigeration circuit includes a compressor, a condenser, and an evaporation path, wherein the evaporation path includes a first path of an expansion valve and an evaporator connected in series. The energy storage battery and the first flow path are connected, 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 and is connected to the second path of the evaporator; 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 is connected in parallel with the first flow path; A first cooling passage is connected in parallel to the second flow path and includes a first heat sink; A second cooling passage is connected in parallel to the second flow path and includes a second heat sink; A three-way valve, wherein the first valve port of the three-way valve is connected to the outlet of the first flow path, the second valve port of the three-way valve is connected to the inlet of the first cooling passage, and the third valve port of the three-way valve is connected to the outlet of the second flow path; wherein, The inner diameter of the pipe matched with the first flow path, the second flow path, the second path of the evaporator, and the first cooling path is Φ1, and the inner diameter of the pipe matched with the second cooling path is Φ2, satisfying: Φ1>Φ2.

2. The energy storage system according to claim 1, characterized in that, Φ1 and Φ2 satisfy: 2≤Φ1 / Φ2≤10.

3. The energy storage system according to claim 1, characterized in that, Also includes: A shut-off valve is provided between the first flow path and the second flow path of the evaporator.

4. The energy storage system according to claim 1, characterized in that, The evaporation flow path is provided with multiple paths, which are connected in parallel. The first flow path is connected to the second path of multiple evaporators.

5. The energy storage system according to claim 1, characterized in that, Also includes: A heater is connected between the first flow path and the second flow path of the evaporator.

6. The energy storage system according to claim 1, characterized in that, Also includes: The water tank has an air inlet that can be selectively connected to the first flow path, and at least one of the first flow path and the second flow path is provided with a liquid replenishment port.

7. The energy storage system according to any one of claims 1-6, characterized in that, The energy storage system has a first working mode. In the first working mode, the compressor, the first pump, the second pump, the first radiator, and the second radiator are working. The second path of the evaporator is connected to the first flow path, the first cooling path is connected to the second flow path, and the second cooling path is connected to the second flow path.

8. The energy storage system according to any one of claims 1-6, 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 operating, the compressor is shut down, the first flow path and the first cooling passage are connected end to end, and the second flow path and the second cooling passage are connected end to end.

9. The energy storage system according to any one of claims 1-6, characterized in that, The energy storage system has a third operating mode. In the third operating mode, the first pump and the second pump are working, the compressor, the first radiator and the second radiator are shut down, the compressor is shut down, the first flow path and the first cooling passage are connected end to end, and the second flow path and the second cooling passage are connected end to end.

10. The energy storage system according to claim 5, characterized in that, The energy storage system has a fourth operating mode. In the fourth operating mode, the heater, the first pump, and the second pump are operating, while the compressor, the first radiator, and the second radiator are shut down. The second flow path of the heater and the evaporator are connected end to end in sequence. The first cooling passage and the second flow path are connected end to end, and the second cooling passage and the second flow path are connected end to end.

11. The energy storage system according to claim 6, characterized in that, The energy storage system has a fifth operating mode. In the fifth operating mode, the first pump and the second pump are working, the compressor, the first radiator and the second radiator are shut down, the second path of the evaporator is connected to the first flow path, the first cooling passage is connected to the first flow path, the first cooling passage is connected to the second flow path, the second cooling passage is connected to the second flow path, and the air inlet of the water tank is connected to the first flow path.

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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