Energy storage system and power utilization system

Abstract

The utility model provides an energy storage system and a power utilization system, and relates to the technical field of energy storage. The energy storage system comprises a battery, a smoke exhaust assembly and a negative pressure prevention device. The battery is provided with a pressure relief mechanism, and the pressure relief mechanism is configured to discharge emissions in the battery when the temperature or the pressure in the battery reaches a first threshold value; the pressure relief mechanism is connected with the smoke exhaust assembly, so that emissions are discharged into the smoke exhaust assembly; and the negative pressure prevention device is arranged on the smoke exhaust assembly and is configured to be started to enable air to enter the smoke exhaust assembly when the pressure in the smoke exhaust assembly is lower than a second threshold value. The negative pressure prevention device is arranged, and the negative pressure prevention device is configured to be started when the pressure in the smoke exhaust assembly is lower than the second threshold value, so that air can enter the smoke exhaust assembly, the pressure in the smoke exhaust assembly is adjusted, and negative pressure is not easy to form. Therefore, the pressure relief mechanism of the battery without thermal runaway is not easy to deform or open a valve in advance, and the service life of the energy storage system is prolonged.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, specifically to an energy storage system and an electricity consumption system. Background Technology

[0002] Energy storage systems typically include exhaust pipes connected to the battery's pressure relief mechanism. These exhaust pipes release internal emissions into the exhaust pipes and discharge them in the event of thermal runaway. Currently, negative pressure exists in these exhaust pipes. This negative pressure causes deformation of the pressure relief mechanism in batteries that have not yet experienced thermal runaway, and may even lead to premature valve opening, thus reducing the lifespan of the energy storage system. Utility Model Content

[0003] Embodiments of this application provide an energy storage system and an electrical system to reduce the problem of reduced lifespan of the energy storage system caused by deformation of the battery's pressure relief mechanism or premature valve opening.

[0004] In a first aspect, embodiments of this application provide an energy storage system, including a battery, an exhaust assembly, and a negative pressure prevention device: the battery has a pressure relief mechanism configured to release emissions from the battery when the temperature or pressure inside the battery reaches a first threshold; the pressure relief mechanism is connected to the exhaust assembly to release the emissions into the exhaust assembly; the negative pressure prevention device is disposed in the exhaust assembly and configured to open when the pressure inside the exhaust assembly is lower than a second threshold to allow air to enter the exhaust assembly, the second threshold being less than the first threshold.

[0005] In one possible implementation, the exhaust assembly includes a main exhaust pipe and multiple exhaust branch pipes connected in parallel to the main exhaust pipe; the energy storage system includes multiple battery clusters arranged along the width direction of the energy storage system, each battery cluster including multiple batteries arranged along the height direction of the energy storage system, each battery cluster corresponding to each exhaust branch pipe, the exhaust branch pipe being connected to the pressure relief mechanism of the battery in the corresponding battery cluster, and at least one exhaust branch pipe being provided with the anti-negative pressure device.

[0006] In one possible implementation, multiple anti-negative pressure devices are provided, with each anti-negative pressure device corresponding to each of the exhaust branch pipes.

[0007] In one possible implementation, the anti-negative pressure device and the main exhaust pipe are respectively located at both ends of the exhaust branch pipe.

[0008] In one possible implementation, the exhaust branch pipe extends along the height direction of the energy storage system, the anti-negative pressure device is disposed at the bottom of the exhaust branch pipe, and the exhaust main pipe is disposed at the top of the battery cluster and communicates with the top of the exhaust branch pipe.

[0009] In one possible implementation, the exhaust branch pipe is provided with a connecting pipe on the side facing the battery cluster, and the connecting pipe is sleeved on the pressure relief mechanism.

[0010] In one possible implementation, the exhaust assembly further includes a transfer pipe connected to the main exhaust pipe and located between the main exhaust pipe and the outlet of the exhaust assembly along the flow direction of the emissions.

[0011] In one possible implementation, the energy storage system further includes a fire damper disposed on the transfer pipe and configured to control the on / off state of the transfer pipe.

[0012] In one possible implementation, the energy storage system further includes an exhaust device located downstream of the fire damper along the flow direction of the emissions and configured to guide the emissions in the transfer pipe toward the outlet of the smoke exhaust assembly.

[0013] In one possible implementation, the energy storage system further includes a controller that is signal-connected to the fire damper and configured to control the fire damper to open when the concentration of combustible gas in the smoke exhaust assembly is higher than a third threshold.

[0014] In one possible implementation, the energy storage system further includes a combustible gas detector, which is signal-connected to the controller and configured to detect whether the concentration of combustible gas in the exhaust assembly is higher than the third threshold.

[0015] In one possible implementation, the exhaust assembly further includes a check valve along the flow direction of the emissions, the check valve being disposed between the transfer pipe and the outlet of the exhaust assembly, and configured to allow the emissions to flow unidirectionally from the transfer pipe to the outlet of the exhaust assembly.

[0016] Secondly, embodiments of this application provide an electrical system including an energy storage system according to any embodiment of the first aspect, wherein the energy storage system is used to supply power to the electrical system.

[0017] The beneficial effects of the embodiments of this application are as follows:

[0018] In the embodiments of this application, by providing an anti-negative pressure device and configuring it to open when the pressure inside the exhaust assembly is lower than a second threshold, air can enter the exhaust assembly. This regulates the pressure inside the exhaust assembly, making it less prone to negative pressure formation. This prevents the pressure relief mechanism of batteries that have not experienced thermal runaway from deforming or prematurely opening, thus helping to extend the service life of the energy storage system. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the energy storage system provided in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram of the assembly of the exhaust assembly and the battery provided in an embodiment of this application;

[0022] Figure 3 A three-dimensional structural diagram of the smoke exhaust assembly provided in an embodiment of this application from one perspective;

[0023] Figure 4 A three-dimensional structural schematic diagram of the smoke exhaust assembly provided in an embodiment of this application from another perspective;

[0024] Figure 5 This is a front view assembly drawing of the smoke exhaust assembly provided in an embodiment of this application;

[0025] Figure 6 This is a rear view assembly drawing of the smoke exhaust assembly provided in an embodiment of this application;

[0026] Figure 7 An exploded view of the smoke exhaust assembly provided in an embodiment of this application;

[0027] Figure 8 This is a structural block diagram of an energy storage system provided in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100-Energy storage system; 10-Battery; 11-Pressure relief mechanism; 20-Smoke exhaust assembly; 21-Main smoke exhaust pipe; 22-Branch smoke exhaust pipe; 221-Connecting pipe; 23-Transfer pipe; 24-Fire damper; 25-Exhaust device; 26-Check valve; 27-Outlet; 28-Installation pipe; 30-Anti-negative pressure device; 40-Controller; 50-Combustible gas detector; 60-Energy storage cabinet; 71-First seal; 72-Second seal; 73-Third seal. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0031] In energy storage systems, exhaust pipes connected to the battery pressure relief mechanism are typically installed to discharge internal emissions in the event of thermal runaway. Currently, negative pressure exists in these exhaust pipes during the discharge process. For example, when the ventilation system is overpowered, gas is rapidly extracted from the exhaust pipe, causing a rapid drop in gas pressure and creating a negative pressure. Similarly, during battery thermal runaway, the release of a large amount of heat causes a sharp rise in the temperature of the surrounding gas. The high-temperature gas expands, decreases in density, and rises. As this high-temperature gas is discharged, the gas flow within the exhaust pipe accelerates, easily creating localized negative pressure. This negative pressure can cause deformation of the pressure relief mechanism in batteries that have not yet experienced thermal runaway, or even premature valve opening, thus reducing the lifespan of the energy storage system.

[0032] Therefore, this application provides an energy storage system 100.

[0033] Reference Figure 1 and Figure 2 , Figure 1 A three-dimensional structural schematic diagram of the energy storage system 100 provided in an embodiment of this application; Figure 2 This is a schematic diagram of the assembly of the exhaust assembly 20 and the battery 10 provided in an embodiment of this application. The energy storage system 100 includes a battery 10, an exhaust assembly 20, and a negative pressure prevention device 30. The battery 10 has a pressure relief mechanism 11, which is configured to release emissions from the battery 10 when the temperature or pressure inside the battery 10 reaches a first threshold. The pressure relief mechanism 11 is connected to the exhaust assembly 20 to release emissions into the exhaust assembly 20. The negative pressure prevention device 30 is disposed in the exhaust assembly 20 and is configured to open when the pressure inside the exhaust assembly 20 is lower than a second threshold to allow air to enter the exhaust assembly 20.

[0034] It is understood that the pressure relief mechanism 11 is configured to release emissions from inside the battery 10 when thermal runaway occurs. When thermal runaway occurs, the internal temperature and pressure of the battery 10 rise sharply. When the temperature or pressure reaches a first threshold, the pressure relief mechanism 11 opens, allowing high-temperature and high-pressure gas to be discharged from the battery 10, thereby mitigating the risk of the battery 10 exploding.

[0035] Among them, the pressure relief mechanism 11 can be an explosion-proof valve or an explosion-proof disc.

[0036] It is understood that the exhaust assembly 20 is used to directionally release emissions from the battery 10 in the event of thermal runaway. When the battery 10 experiences thermal runaway, the emissions are released into the exhaust assembly 20 via the pressure relief mechanism 11 of the battery 10. This reduces the risk of the emissions coming into contact with other components within the energy storage system 100, thereby improving the reliability of the energy storage system 100 and extending its service life.

[0037] The energy storage system 100 includes multiple battery clusters arranged along the width of the system, with each cluster comprising multiple batteries 10 arranged along the height of the system. For example, the energy storage system 100 may include ten battery clusters arranged along the width of the system, with each cluster comprising eight batteries 10 arranged along the height of the system. A pressure relief mechanism 11 for each battery 10 is connected to a smoke exhaust assembly 20.

[0038] Since the first threshold is the temperature or pressure value inside the battery 10 when thermal runaway occurs, and the second threshold is the pressure value inside the exhaust assembly 20, it can be understood that the second threshold is less than the first threshold.

[0039] It is understood that the anti-negative pressure device 30 is used to balance the pressure inside and outside the smoke exhaust assembly 20, so as to reduce the occurrence of negative pressure inside the smoke exhaust assembly 20. When the pressure inside the smoke exhaust assembly 20 is lower than the second threshold, the anti-negative pressure device 30 opens, making the inside and outside of the smoke exhaust assembly 20 connected, allowing air to enter the smoke exhaust assembly 20, thereby balancing the pressure inside and outside the smoke exhaust assembly 20 and preventing the formation of negative pressure inside the smoke exhaust assembly 20.

[0040] The anti-negative pressure device 30 can be a mechanical anti-negative pressure device 30 or an electronic anti-negative pressure device 30.

[0041] In one example, the anti-negative pressure device 30 includes a valve body and a valve core. The valve body is disposed in the smoke exhaust assembly 20, and the valve core has an air inlet channel. When the pressure inside the smoke exhaust assembly 20 is lower than a second threshold, the air inlet channel of the valve core is opened, allowing air to enter the smoke exhaust assembly 20. The pressure inside the smoke exhaust assembly 20 is regulated, so that negative pressure is not easily formed inside the smoke exhaust assembly 20.

[0042] In another example, the anti-negative pressure device 30 includes a pressure sensor, a relay, and an actuator, both of which are signal-connected to the relay. The pressure sensor collects pressure data within the exhaust assembly 20 in real time and transmits it to the relay. The relay analyzes and processes the data according to a preset second threshold. When it determines that the pressure within the exhaust assembly 20 is lower than the second threshold, it issues a command to control the actuator to open and replenish air, thereby regulating the pressure within the exhaust assembly 20.

[0043] Reference Figure 7 In another example, the anti-negative pressure device 30 is a threaded component, and the smoke exhaust assembly 20 is provided with an air inlet. The threaded component is threadedly connected to the air inlet. When the pressure inside the smoke exhaust assembly 20 is lower than the pressure outside the smoke exhaust assembly 20, the threaded component can be loosened, allowing air to enter the smoke exhaust assembly 20 through the tiny gap between the threaded component and the air inlet, thereby balancing the pressure inside and outside the smoke exhaust assembly 20 and preventing the formation of negative pressure inside the smoke exhaust assembly 20.

[0044] Because the pressure relief mechanism 11 of the battery 10 is connected to the exhaust assembly 20, when a negative pressure forms inside the exhaust assembly 20, the pressure relief mechanism 11 of the battery 10, which has not experienced thermal runaway, is prone to deformation or even premature valve opening. In this embodiment, by providing an anti-negative pressure device 30 and configuring the anti-negative pressure device 30 to open when the pressure inside the exhaust assembly 20 is lower than a second threshold, air can enter the exhaust assembly 20. This regulates the pressure inside the exhaust assembly 20, making it less likely for a negative pressure to form. This makes it less likely for the pressure relief mechanism 11 of the battery 10, which has not experienced thermal runaway, to deform or prematurely open, thus helping to extend the service life of the energy storage system 100.

[0045] In some embodiments, the smoke exhaust assembly 20 includes a main smoke exhaust pipe 21 and a plurality of smoke exhaust branch pipes 22 connected in parallel to the main smoke exhaust pipe 21. Each battery cluster corresponds to each smoke exhaust branch pipe 22, and the smoke exhaust branch pipe 22 is connected to the pressure relief mechanism 11 of the battery 10 in the corresponding battery cluster. At least one smoke exhaust branch pipe 22 is provided with an anti-negative pressure device 30.

[0046] It is understandable that one battery cluster corresponds to one exhaust branch pipe 22, and multiple batteries 10 in one battery cluster share one exhaust branch pipe 22.

[0047] In some embodiments, multiple anti-negative pressure devices 30 are provided, each corresponding to each exhaust branch pipe 22. In other words, each exhaust branch pipe 22 is provided with an anti-negative pressure device 30. This arrangement helps to reduce the risk of negative pressure forming in each exhaust branch pipe 22.

[0048] In this embodiment, since the exhaust branch pipe 22 is close to the pressure relief mechanism 11 of the corresponding battery 10, the anti-negative pressure device 30 is installed on the exhaust branch pipe 22. The anti-negative pressure device 30 is positioned close to the pressure relief mechanism 11, which can directly adjust the pressure in the area near the pressure relief mechanism 11, effectively alleviate the formation of negative pressure in the exhaust branch pipe 22, thereby improving the anti-negative pressure effect and helping to reduce the risk of deformation or premature valve opening of the pressure relief mechanism 11 of the battery 10 that has not experienced thermal runaway.

[0049] In some embodiments, the anti-negative pressure device 30 and the main exhaust pipe 21 are respectively disposed at both ends of the exhaust branch pipe 22. This arrangement facilitates the separate arrangement of the anti-negative pressure device 30 and the main exhaust pipe 21, thereby reducing the assembly difficulty of the energy storage system 100.

[0050] In some embodiments, the exhaust branch pipe 22 extends along the height direction of the energy storage system 100, the anti-negative pressure device 30 is disposed at the bottom of the exhaust branch pipe 22, and the exhaust main pipe 21 is disposed at the top of the battery cluster and communicates with the top of the exhaust branch pipe 22.

[0051] Because the temperature and pressure of the emissions from the battery 10 that has experienced thermal runaway are high, and the emissions tend to rise, the pressure at the top of the exhaust branch pipe 22 is high and the pressure at the bottom is low when the battery 10 experiences thermal runaway. The area near the bottom is more likely to form a negative pressure. Therefore, in this embodiment, by placing the exhaust main pipe 21 at the top of the battery cluster and the anti-negative pressure device 30 at the bottom of the exhaust branch pipe 22, it is possible to facilitate the discharge of the emissions from the battery 10 from the top and alleviate the formation of a negative pressure in the bottom area of ​​the exhaust branch pipe 22.

[0052] Reference Figure 1 In some embodiments, the energy storage system 100 further includes an energy storage cabinet 60, with the battery cluster disposed inside the energy storage cabinet 60, the exhaust assembly 20 disposed outside the energy storage cabinet 60, the exhaust main pipe 21 disposed at the top of the energy storage cabinet 60, and the exhaust branch pipe 22 disposed on the side wall of the energy storage cabinet 60 via a U-shaped connector.

[0053] The energy storage cabinet 60 has a first side wall facing the exhaust branch pipe 22. The first side wall is provided with a clearance hole corresponding to the pressure relief mechanism 11 of the battery 10 so that the exhaust branch pipe 22 can be connected to the pressure relief mechanism 11.

[0054] In some embodiments, a connecting pipe 221 is provided on the side of the exhaust branch pipe 22 facing the battery cluster. The connecting pipe 221 passes through the clearance hole and is sleeved on the pressure relief mechanism 11. This arrangement helps to reduce the assembly difficulty of the exhaust branch pipe 22 and the pressure relief mechanism 11.

[0055] The connecting pipe 221 and the smoke exhaust branch pipe 22 can be integrally formed or separately prepared and then welded together.

[0056] Figure 3 This is a three-dimensional structural diagram of the smoke exhaust assembly 20 provided in an embodiment of this application from one perspective; Figure 4 A three-dimensional structural schematic diagram of the smoke exhaust assembly 20 provided in an embodiment of this application from another perspective; Figure 5 This is a front view of the smoke exhaust assembly 20 provided in an embodiment of this application; Figure 6 A rear view of the smoke exhaust assembly 20 provided in an embodiment of this application; Figure 7 This is an exploded view of the smoke exhaust assembly 20 provided in an embodiment of this application.

[0057] Reference Figures 3 to 7 In some possible implementations, the exhaust branch pipe 22 includes multiple straight pipes and one bend. The multiple straight pipes are arranged sequentially along the height direction of the energy storage system 100. The anti-negative pressure device 30 is installed on the bottom straight pipe, and the top straight pipe is connected to the exhaust main pipe 21 via the bend. Both the straight pipes and the bend are provided with flanges. Two adjacent straight pipes are fixedly connected by the flanges. A first sealing element 71 is provided between two adjacent straight pipes. The first sealing element 71 is annular and has a connecting part. The two adjacent straight pipes are connected through the connecting part. A second sealing element 72 is provided between the straight pipes and the bend. The second sealing element 72 is annular and has a connecting part. The straight pipes and the bend are connected through the connecting part of the second sealing element 72.

[0058] Reference Figures 3 to 7 In some embodiments, the main exhaust pipe 21 includes multiple straight pipes arranged sequentially along the width direction of the energy storage system 100. Each straight pipe is provided with a flange, and two adjacent straight pipes are fixedly connected by a flange. A third sealing element 73 is provided between two adjacent straight pipes. The third sealing element 73 is annular and has a connecting portion, through which the two adjacent straight pipes are connected.

[0059] At least one of the first sealing element 71, the second sealing element 72, and the third sealing element 73 can be a rubber gasket.

[0060] In some embodiments, the exhaust assembly 20 further includes a transfer pipe 23, which communicates with the main exhaust pipe 21 and is located between the main exhaust pipe 21 and the outlet 27 of the exhaust assembly 20 along the flow direction of the emissions. The transfer pipe 23 is used to change the flow direction of the emissions in order to discharge the emissions.

[0061] It is understood that the emissions generated by the batteries 10 in each battery cluster will be discharged to the corresponding exhaust branch pipe 22. Subsequently, the emissions in each exhaust branch pipe 22 will be collected in the exhaust main pipe 21 and then discharged to the outlet 27 through the transfer pipe 23.

[0062] In some embodiments, the energy storage system 100 further includes a fire damper 24 disposed on the transfer pipe 23 and configured to control the on / off state of the transfer pipe 23.

[0063] It is understood that the fire damper 24 is located between the outlet 27 and the main exhaust pipe 21 of the smoke exhaust assembly 20. When the battery 10 does not experience thermal runaway, the fire damper 24 controls the transfer pipe 23 to disconnect, cutting off the smoke exhaust pipe 21 from the outlet 27, so that the interior of the smoke exhaust assembly 20 is relatively isolated from the outside, making it difficult for foreign objects to enter the smoke exhaust assembly 20 through the outlet 27; when the battery 10 experiences thermal runaway, the fire damper 24 controls the transfer pipe 23 to open, connecting the smoke exhaust pipe 21 and the outlet 27, so that the interior of the smoke exhaust assembly 20 is connected to the outside, thereby allowing the exhaust materials to be discharged.

[0064] In some embodiments, the energy storage system 100 further includes an exhaust device 25 disposed downstream of the fire damper 24 along the flow direction of the emissions and configured to guide the emissions in the transfer pipe 23 toward the outlet 27 of the smoke exhaust assembly 20.

[0065] It is understandable that when the battery 10 experiences thermal runaway, the fire damper 24 opens, and the exhaust fan 25 operates downstream of the fire damper 24. The exhaust fan 25 draws air from the smoke exhaust pipe 21 to the outlet 27, creating a centrifugal zone downstream of the fire damper 24. Under the action of this centrifugal zone, the air in the smoke exhaust pipe 21 accelerates its flow towards the outlet 27, thereby accelerating the discharge of emissions.

[0066] The exhaust device 25 can be an explosion-proof fan. The specific structure of the explosion-proof fan can adopt existing technology, which will not be described in detail here. The explosion-proof motor can prevent electrical sparks and high temperatures generated inside the motor from igniting surrounding flammable and explosive materials, which helps to improve the reliability of the energy storage system 100.

[0067] It should be noted that the anti-negative pressure device 30 and the exhaust device 25 are different devices. The exhaust device 25 is a baffle device located near the outlet 27, whose function is to drive the air in the exhaust assembly 20 to flow rapidly, facilitating the rapid discharge of emissions from the exhaust assembly 20. However, when the exhaust power of the exhaust device 25 is high, the air flow in the exhaust assembly 20 is too fast, which can easily lead to the formation of negative pressure inside. The anti-negative pressure device 30, on the other hand, is used to allow air to enter the exhaust assembly 20, balance the air pressure inside and outside the exhaust assembly 20, and prevent the formation of negative pressure inside the exhaust assembly 20. By setting up the anti-negative pressure device 30, when the exhaust device 25 easily causes negative pressure to form inside the exhaust assembly 20, external air can be allowed to enter the exhaust assembly 20, thus preventing the formation of negative pressure.

[0068] Reference Figure 8 , Figure 8The diagram shows the structure of the energy storage system 100 provided in the embodiments of this application. In some embodiments, the energy storage system 100 further includes a controller 40, which is signal-connected to the fire damper 24 and configured to control the fire damper 24 to open when the concentration of combustible gas in the smoke exhaust assembly 20 is higher than a third threshold.

[0069] It is understandable that when the concentration of combustible gas in the smoke exhaust assembly 20 is higher than the third threshold, the controller 40 can control the fire damper 24 to open automatically so that the emissions can be discharged.

[0070] The specific value of the third threshold can be set according to the protection level of the energy storage system 100.

[0071] The combustible gas can be hydrogen, etc.

[0072] In some embodiments, the energy storage system 100 further includes a combustible gas detector 50, which is signal-connected to the controller 40 and configured to detect whether the concentration of combustible gas in the exhaust assembly 20 is higher than a third threshold.

[0073] The exhaust assembly 20 may contain a variety of combustible gases, and the combustible gas detector 50 can be configured to detect the concentration of one or more combustible gases.

[0074] The combustible gas detector 50 can be used to detect the concentration of combustible gas in the smoke exhaust assembly 20 in real time and transmit the detected data to the controller 40. When the combustible gas sensor detects that the concentration of combustible gas is higher than the third threshold, the controller 40 controls the fire damper 24 to open.

[0075] In some embodiments, the combustible gas detector 50 may also be configured to issue a warning signal when the concentration of combustible gas within the exhaust assembly 20 is detected to be higher than a third threshold. The warning signal may be an audible signal, a visible light signal, etc.

[0076] The combustible gas detector 50 can be installed in either the exhaust branch pipe 22 or the exhaust main pipe 21. To reduce the assembly difficulty of the combustible gas detector 50, in one example, the combustible gas detector 50 is installed between the exhaust main pipe 21 and the outlet 27.

[0077] In some embodiments, three combustible gas detectors 50 are provided. One combustible gas detector 50 is located in the transfer pipe 23, one combustible gas detector 50 is located in the exhaust device 25, and one combustible gas detector 50 is located in the outlet 27. This arrangement helps to improve detection reliability.

[0078] In some embodiments, the exhaust assembly 20 further includes a check valve 26, which is disposed between the transfer pipe 23 and the outlet 27 of the exhaust assembly 20 along the flow direction of the exhaust, and is configured to allow unidirectional flow of the exhaust from the transfer pipe 23 to the outlet 27 of the exhaust assembly 20.

[0079] It is understandable that check valve 26 is a one-way valve.

[0080] In one example, check valve 26 includes a valve body, a valve disc, and a pin. The valve body can be installed downstream of the exhaust device 25 via mounting pipe 28. The valve disc is plate-shaped and is mounted inside the valve body near the outlet 27 via the pin. The pin is the pivot of the valve disc's movement, allowing the valve disc to rotate around it. When discharge flows into the check valve 26 from the inlet, the fluid pressure pushes the valve disc to rotate upward around the pin, opening it and allowing it to pass smoothly through the outlet 27. When the discharge has a reverse flow tendency, the discharge pressure and the valve disc's own weight cause the valve disc to rotate downward around the pin, tightly fitting the valve seat at the valve body outlet 27, thereby preventing backflow of discharge.

[0081] In this embodiment, by setting a check valve 26, the emissions are less likely to flow back to the main exhaust pipe 21 or the branch exhaust pipe 22. As a result, the emissions discharged through the check valve 26 are less likely to come into secondary contact with the battery 10, which helps to reduce the risk of secondary thermal runaway or explosion caused by secondary contact of emissions with the battery 10.

[0082] Secondly, embodiments of this application provide an electrical system including an energy storage system 100 according to any embodiment of the first aspect, wherein the energy storage system 100 is used to supply power to the electrical system. Since the electrical system includes the energy storage system 100, all the beneficial effects of including the energy storage system 100 in the electrical system will not be elaborated here.

[0083] The electrical system can be used for ships.

[0084] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0085] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0086] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0087] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An energy storage system, characterized in that, include: A battery having a pressure relief mechanism configured to release emissions from the battery when the temperature or pressure inside the battery reaches a first threshold. A smoke exhaust assembly, wherein the pressure relief mechanism is connected to the smoke exhaust assembly to allow the emissions to be released into the smoke exhaust assembly; A negative pressure prevention device is disposed in the smoke exhaust assembly and configured to activate when the pressure in the smoke exhaust assembly is lower than a second threshold, wherein the second threshold is less than the first threshold.

2. The energy storage system according to claim 1, characterized in that, The smoke exhaust assembly includes a main smoke exhaust pipe and multiple smoke exhaust branch pipes connected in parallel to the main smoke exhaust pipe; The energy storage system includes multiple battery clusters arranged along the width direction of the energy storage system. Each battery cluster includes multiple batteries arranged along the height direction of the energy storage system. Each battery cluster corresponds to each exhaust branch pipe. The exhaust branch pipe is connected to the pressure relief mechanism of the battery in the corresponding battery cluster. At least one exhaust branch pipe is provided with the anti-negative pressure device.

3. The energy storage system according to claim 2, characterized in that, Multiple anti-negative pressure devices are provided, and each anti-negative pressure device corresponds to each of the exhaust branch pipes.

4. The energy storage system according to claim 2, characterized in that, The anti-negative pressure device and the main exhaust pipe are respectively installed at both ends of the branch exhaust pipe.

5. The energy storage system according to claim 4, characterized in that, The exhaust branch pipe extends along the height direction of the energy storage system, the anti-negative pressure device is located at the bottom of the exhaust branch pipe, and the exhaust main pipe is located at the top of the battery cluster and communicates with the top of the exhaust branch pipe.

6. The energy storage system according to claim 2, characterized in that, The exhaust branch pipe is provided with a connecting pipe on the side facing the battery cluster, and the connecting pipe is sleeved on the pressure relief mechanism.

7. The energy storage system according to any one of claims 2-6, characterized in that, The exhaust assembly also includes a transfer pipe, which is connected to the main exhaust pipe and is located between the main exhaust pipe and the outlet of the exhaust assembly along the flow direction of the emissions.

8. The energy storage system according to claim 7, characterized in that, The energy storage system also includes: A fire damper, installed on the transfer pipe, is configured to control the on / off state of the transfer pipe.

9. The energy storage system according to claim 8, characterized in that, The energy storage system also includes: An exhaust device is located downstream of the fire damper along the flow direction of the emissions and is configured to guide the emissions in the transfer pipe toward the outlet of the smoke exhaust assembly.

10. The energy storage system according to claim 8, characterized in that, The energy storage system also includes: The controller is signal-connected to the fire damper and configured to control the fire damper to open when the concentration of combustible gas in the smoke exhaust assembly is higher than a third threshold.

11. The energy storage system according to claim 10, characterized in that, The energy storage system also includes: A combustible gas detector, connected to the controller, is configured to detect whether the concentration of combustible gas in the exhaust assembly is higher than the third threshold.

12. The energy storage system according to claim 7, characterized in that, The smoke exhaust assembly also includes: A check valve is disposed between the transfer pipe and the outlet of the exhaust assembly along the flow direction of the emissions, and is configured to allow the emissions to flow unidirectionally from the transfer pipe to the outlet of the exhaust assembly.

13. An electrical system, characterized in that, The system includes the energy storage system according to any one of claims 1-12, wherein the energy storage system is used to supply power to the power consumption system.

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