Energy storage devices, energy storage systems and charging networks

Abstract

This application provides an energy storage device, an energy storage system, and a charging network. The energy storage device includes a cabinet, an explosion vent, and a flame arrestor assembly. The cabinet has an explosion vent. The explosion vent is movably connected to the cabinet to cover or expose the explosion vent. The flame arrestor assembly is located on the outside of the cabinet and includes a flow guiding structure and a flame arrestor structure. The flow guiding structure has a flow guiding channel configured to communicate with the explosion vent. The flame arrestor structure is connected to the side of the flow guiding structure opposite to the explosion vent and communicates with the flow guiding channel. This energy storage device can reduce the hazards to the external environment and personnel caused by the overflowing flames during explosion venting.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an energy storage device, energy storage system and charging network. Background Technology

[0002] Against the backdrop of increased global support for the development of new energy technologies, various energy storage-related technologies have been widely applied. Energy storage devices, due to their advantages such as high energy density and long lifespan, are increasingly being used across various fields.

[0003] Energy storage devices include a cabinet and a battery unit housed within the cabinet. Thermal runaway of the battery unit can lead to the release of a large amount of flammable gas in a short period of time. These gases can accumulate in a confined space and are highly likely to cause an explosion. This can not only damage the cabinet but also pose a serious threat to the external environment and personnel safety. Utility Model Content

[0004] The energy storage device, energy storage system and charging network provided in this application can reduce the harm to the external environment and personnel caused by the overflowing flames during the explosion venting.

[0005] To solve the aforementioned technical problems, this application adopts the following technical solution: An energy storage device is provided. The energy storage device includes a cabinet, an explosion vent, and a flame arrestor assembly. The cabinet has an explosion vent. The explosion vent is movably connected to the cabinet to cover or expose the explosion vent. The flame arrestor assembly is located on the outside of the cabinet and includes a flow guiding structure and a flame arrestor structure. The flow guiding structure has a flow guiding channel configured to communicate with the explosion vent. The flame arrestor structure is connected to the side of the flow guiding structure opposite to the explosion vent and communicates with the flow guiding channel.

[0006] The above-described solution allows for pressure relief by opening the explosion relief plate to expose the explosion vent when the pressure inside the cabinet becomes excessive. After the explosion, the plate can be closed again to cover the vent, enabling reuse of the plate. Compared to disposable plates, this eliminates the need for replacement after each explosion, simplifying operation. Furthermore, by installing a flame arrestor structure on the outside of the explosion vent, the outward spread of flames during explosion relief is effectively prevented without obstructing gas flow, significantly reducing the safety threat to the external environment and personnel. Additionally, by installing a flow guide structure between the flame arrestor structure and the explosion vent, the flame flow is guided in a predetermined direction, reducing the risk of flame spread in all directions. Simultaneously, the flow guide structure evenly disperses the explosion shock wave, directing the flame flow throughout the flame arrestor structure for flame arrest and extinguishing. The flow guide structure also slows the flame flow velocity, reducing the risk of damage to the flame arrestor structure due to localized impact forces. Furthermore, since the explosion will produce large particles of residue such as high-temperature clumps, dust clumps, and molten residue, the flow guiding structure can achieve initial buffering and settling. The large particles of residue will slow down and settle when they collide with the side wall of the flow guiding structure, reducing the direct impact of high-temperature residue on the flame arrestor structure and extending the service life of the flame arrestor structure and reducing the frequency of cleaning.

[0007] In one embodiment, the direction of the flow channel is parallel to the axial direction of the explosion vent. This creates a straight flow channel, facilitating rapid fire suppression.

[0008] In one embodiment, the flow guiding channel and the explosion vent are arranged coaxially. This results in a larger overlap area between the flow guiding channel and the explosion vent, making it easier for the flame jet from the explosion vent to enter the flow guiding channel.

[0009] In one embodiment, the orthographic projection of the flow channel onto the cabinet covers the entire explosion vent plate. This allows the explosion vent plate to be freely opened or closed within the flow channel, reducing the impact of the flow structure on the explosion venting process.

[0010] In one embodiment, the flame-arresting structure includes a hollow shell and a mesh structure. The hollow shell is connected to the side of the flow-guiding structure opposite to the explosion vent. The mesh structure is disposed inside the hollow shell and communicates with the flow-guiding channel.

[0011] The above-described scheme, by setting up a mesh structure, can divide the flame flow into many smaller flame flows, which are extinguished by the heat dissipation effect of the mesh structure and the wall effect. Furthermore, by setting up a hollow shell and placing the mesh structure inside the hollow shell, the flame arrestor structure can be adapted to different shapes of flow guiding structures, thus expanding its applicability.

[0012] In one embodiment, the mesh structure includes a plurality of mesh openings, the opening diameter of which is less than 0.5 mm. This increases the probability that the flame stream will be extinguished as it passes through the mesh openings, thus achieving reliable flame arrestability of the mesh structure.

[0013] In one embodiment, the fire-arresting component further includes: The pressure relief structure includes a pressure relief channel, which is connected to the flow guiding channel and the flame arrestor structure, and the cross-sectional area of ​​the pressure relief channel gradually increases in the direction away from the explosion vent.

[0014] The above-described scheme allows the flame stream overflowing from the explosion vent to expand rapidly within the pressure relief channel, significantly reducing the pressure peak. Furthermore, the pressure relief section disperses the concentrated airflow, evenly distributing the flame stream shock wave across the entire flame-arresting structure, resulting in a substantial decrease in load per unit area. This effectively reduces the risk of deformation of the mesh structure under the influence of the flame stream, increasing the probability of the flame stream being stably extinguished by the mesh structure. Additionally, the rapid decrease in velocity of high-speed, high-temperature flame streams and large particles of debris entering the pressure relief channel causes these particles to settle, reducing the risk of high-temperature, large particles directly adhering to and eroding the mesh of the flame-arresting structure, or even clogging the mesh and causing flame-arresting failure.

[0015] In one embodiment, the pressure relief structure is connected between the flow guiding structure and the flame arrestor structure. This reduces the impact of the pressure relief structure on the opening or closing process of the explosion relief plate.

[0016] In one embodiment, the pressure relief structure is integrally formed with the hollow shell.

[0017] The above solution can increase the connection strength and reliability between the pressure relief structure and the flame arrestor structure, and reduce the risk of flame flow overflowing from the gap between the pressure relief structure and the flame arrestor structure.

[0018] In one embodiment, the circumferential profile of the flow channel matches the circumferential profile of the explosion relief plate; and / or the circumferential profile of the hollow shell matches the circumferential profile of the flow guiding structure.

[0019] The above scheme facilitates the installation and positioning of various structural components in the fire-arresting assembly and minimizes the radial dimension of the fire-arresting assembly as much as possible.

[0020] To solve the above-mentioned technical problems, the second technical solution adopted in this application is: to provide an energy storage system, which includes a power conversion device and the aforementioned energy storage device, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0021] To solve the above-mentioned technical problems, the third technical solution adopted in this application is to provide a charging network, which includes charging piles and the energy storage device mentioned above, wherein the energy storage device is used to provide power to the charging piles.

[0022] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the structure of a charging network provided in one embodiment of this application; Figure 2 This is a schematic diagram of the energy storage device in one embodiment of this application; Figure 3 This is a schematic diagram of the energy storage system in one embodiment of this application; Figure 4 This is a schematic diagram of the structure of an energy storage device provided in another embodiment of this application; Figure 5 for Figure 4 Top view of the energy storage device shown; Figure 6 Provided for an embodiment of this application Figure 5 A sectional view of the structure shown along line AA; Figure 7 for Figure 6 Enlarged view of point M in the structure shown; Figure 8 This is a simplified structural diagram of an energy storage device during explosion venting, provided in one embodiment of this application. Figure 9 This is a vertical cross-sectional view of a fire-retardant structure provided in an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures 1000 Charging network; 2000 Energy storage system; 3000 Power generation device; 100 Battery device; 200 Energy storage device; 210 Cabinet; 211 Explosion vent; 220 Explosion vent plate; 230 Fire arrestor assembly; 231 Flow guiding structure; 2311 Flow guiding channel; 232 Fire arrestor structure; 2321 Hollow shell; 2322 Mesh structure; 2323 Mesh; 233 Pressure relief structure; 2331 Pressure relief channel; 300 Charging pile; 400 Energy storage converter. Detailed Implementation

[0025] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0027] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0030] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0031] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0032] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0033] In related technologies, after an explosion occurs in an energy storage device, the pressure inside the cabinet suddenly increases. At this time, the explosion can be relieved by using a vent plate, but the flames overflowing from the vent during the venting process can cause harm to the external environment and personnel.

[0034] Based on this, the energy storage device provided in this application embodiment features an explosion-proof plate installed through the explosion-proof vent and a flame-arresting structure on the outside of the cabinet. This not only allows for pressure relief through the explosion-proof plate but also effectively prevents the flame from spreading outwards during explosion venting through the flame-arresting structure, significantly reducing the safety threat posed by the flame to the external environment and personnel during explosion venting. Furthermore, by adding a flow-guiding structure, the risk of flames spreading in all directions can be further reduced, as can the risk of flames damaging the flame-arresting structure, and the probability of flames overflowing from the explosion-proof vent being extinguished can be increased.

[0035] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of a charging network 1000 provided in one embodiment of this application; Figure 2 This is a schematic diagram of the structure of an energy storage device 200 provided in one embodiment of this application. In one embodiment, a charging network 1000 is provided, which includes a charging pile 300 and an energy storage device 200. The charging pile 300 is used to charge electrical equipment. The energy storage device 200 is electrically connected to the charging pile 300 and is used to provide electrical energy to the charging pile 300.

[0037] It should be noted that the charging pile 300 and the battery cells in the energy storage device 200 are electrically connected via cables, and the battery cells can supply their stored electrical energy to the charging pile 300. The charging pile 300 has a connector that can be connected to electrical equipment, thereby replenishing the equipment's power. The application of the energy storage device 200 in this charging network 1000 can effectively improve the safety of the charging network 1000 and also help to enhance the flexibility of the charging network 1000 during deployment.

[0038] In a charging network 1000, there can be one charging pile 300, and the energy storage device 200 provides power to the one charging pile 300; there can also be multiple charging piles 300, and the energy storage device 200 provides power to multiple charging piles 300.

[0039] As an example, such as Figure 1 As shown, the charging network 1000 includes an energy storage device 200 and two charging piles 300, with the energy storage device 200 providing power to the two charging piles 300.

[0040] See Figure 2 The energy storage device 200 may include a battery device 100, which is electrically connected to the charging pile 300 so that the battery device 100 can provide power to the charging pile 300.

[0041] Please refer to Figure 2 and Figure 3 , Figure 3 This is a schematic diagram of the structure of an energy storage system 2000 provided in an embodiment of this application. The energy storage system 2000 includes an energy storage converter 400, a power conversion device, and an energy storage device 200.

[0042] The energy storage converter 400 can be electrically connected to the generator 3000 to convert the electrical power provided by the generator 3000. The energy storage device 200 is electrically connected to the energy storage converter 400, and the energy storage converter 400 converts the electrical energy provided by the generator 3000 and stores it in the energy storage device 200.

[0043] A power conversion device is used to connect the power generation device 3000 and the energy storage device 200. The power generation device 3000 generates electrical energy and stores it in the energy storage device 200 via the power conversion device. The use of the energy storage device 200 in the energy storage system 2000 effectively improves its operational safety. In specific implementations, the power generation device 3000 can be a solar panel, hydroelectric power generation equipment, thermal power generation equipment, etc. This application does not limit the specific type of the power generation device 3000.

[0044] As an example, such as Figure 3 As shown, the energy storage system 2000 includes an energy storage device 200 and an energy storage converter 400. The two power generation devices 3000 respectively transmit the generated electrical energy to the energy storage converter 400, and the energy storage converter 400 introduces the electrical energy into the energy storage device 200 for storage.

[0045] Please refer to Figures 2 to 8 , Figure 4 This is a schematic diagram of the structure of an energy storage device provided in another embodiment of this application; Figure 5 for Figure 4 Top view of the energy storage device shown; Figure 6 Provided for an embodiment of this application Figure 5 A sectional view of the structure shown along line AA; Figure 7 for Figure 6 Enlarged view of point M in the structure shown; Figure 8 This is a simplified structural diagram of an energy storage device during explosion venting, as provided in an embodiment of this application.

[0046] In one embodiment, an energy storage device 200 is provided. The energy storage device 200 includes a cabinet 210, an explosion vent 220, and a flame arrestor assembly 230. The cabinet 210 has an explosion vent 211. The explosion vent 220 is movably connected to the cabinet 210 to cover or expose the explosion vent 211. The flame arrestor assembly 230 is disposed on the outside of the cabinet 210 and includes a flow guiding structure 231 and a flame arrestor structure 232. The flow guiding structure 231 has a flow guiding channel 2311 configured to communicate with the explosion vent 211. The flame arrestor structure 232 is connected to the side of the flow guiding structure 231 opposite to the explosion vent 211 and communicates with the flow guiding channel 2311.

[0047] As an example, the energy storage device 200 can be an energy storage container, an energy storage cabinet, etc.

[0048] As an example, energy storage device 200 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage power stations can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. Wind power generation systems collect wind energy from wind turbines, convert it into electrical energy, and store it in energy storage device 200. Solar power generation systems can convert solar energy into electrical energy, store it in energy storage device 200, and supply it to users as needed. Mobile power systems can supply power to relevant electrical equipment in areas where the mains power supply cannot reach, such as remote mountainous areas and remote wilderness areas. Temporary power supply systems can provide power to users when there is insufficient power supply.

[0049] A battery device 100 is installed inside the cabinet 210. The battery device 100 includes multiple battery cells. The multiple battery cells can be connected in series, parallel, or mixed to form a battery assembly. In some other embodiments, the multiple battery cells can also be connected in series, parallel, or mixed first, and arranged in a fixed manner to form a battery assembly. In still other embodiments, the multiple battery cells can also be connected in series, parallel, or mixed first, and arranged in a fixed manner to form multiple components, and the multiple components can then be connected in series, parallel, or mixed to form a whole.

[0050] As an example, multiple battery cells can be fixed together to form a battery assembly using cable ties or similar means. As another example, multiple battery cells can also be fixed together to form a battery assembly using end plates, side plates, or similar means.

[0051] The battery cell involved in this application refers to the smallest unit that stores and outputs electrical energy. The battery cell can be a secondary battery or a primary battery. The battery cell can be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell can be cylindrical, flat, cuboid, or other shapes.

[0052] A single battery cell may include a casing, electrode assemblies, and other functional components. The casing includes end caps and a bottom shell. An end cap is a component that closes onto the opening of the bottom shell to isolate the internal environment of the battery cell from the external environment. The shape of the end cap may, without limitation, conform to the shape of the bottom shell. Optionally, the end cap may be made of a material with a certain degree of hardness and strength (such as aluminum alloy), so that the end cap is less prone to deformation under pressure and impact, giving the battery cell higher structural strength and improving safety performance.

[0053] The end cap may be provided with functional components such as electrode terminals. The electrode terminals can be used for electrical connection with electrode assemblies to output or input electrical energy into the battery cell. In some embodiments, the electrode terminals may include terminals. Terminals may include positive and negative terminals for current output and connection to external circuits. In some embodiments, the end cap may also be provided with an explosion-proof component for releasing internal pressure when the internal pressure or temperature of the battery cell reaches a threshold. The end cap can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic. In some embodiments, an insulating component may be provided on the inner side of the end cap to isolate the electrical connection components within the bottom shell from the end cap, reducing the risk of short circuits. For example, the insulating component may be plastic, rubber, etc. The bottom shell is an assembly used to cooperate with the end cap to form the internal environment of the battery cell, wherein the formed internal environment can accommodate electrode assemblies, electrolytes, and other components. The bottom shell and the end cap may be independent components, and an opening may be provided on the bottom shell, with the end cap closing the opening to form the internal environment of the battery cell. The end cap and bottom shell can be integrated, without limitation. Specifically, the end cap and bottom shell can form a common connecting surface before other components are installed. When it is necessary to encapsulate the interior of the bottom shell, the end cap is then placed over it. The bottom shell can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the bottom shell can be determined according to the specific shape and size of the electrode assembly. The bottom shell can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0054] Electrode assemblies are the components within a single battery cell where electrochemical reactions occur. The bottom casing may contain one or more electrode assemblies. Electrode assemblies are primarily formed by winding or stacking positive and negative electrode plates, typically with a separator between them. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly, while the portions without active material each form a tab. The positive and negative tabs can be located together at one end of the main body or separately at both ends. During charging and discharging, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0055] In one example, see Figure 4 Along the height direction Z of the cabinet 210, an explosion vent 211 is provided at the top of the cabinet 210. There can be two explosion vents 211, which are spaced apart at the top of the cabinet 210.

[0056] See Figure 7 The explosion relief plate 220 covers the entire explosion relief vent 211. See also... Figure 8When the air pressure inside the cabinet 210 reaches the threshold, the explosion relief plate 220 opens and exposes the explosion relief port 211, enabling the cabinet 210 to achieve the explosion relief effect. As an example, the threshold is 0.1 bar.

[0057] In one example, the energy storage device 200 also includes a drive unit (not shown) configured to provide opening power to the explosion relief plate 220 under preset conditions, thereby opening the explosion relief plate 220 and exposing the explosion relief port 211. The preset conditions refer to abnormal changes within the cabinet 210 reaching a preset level before an explosion, specifically including any one or more of the following abnormal changes: the gas pressure inside the cabinet 210 reaches a preset value, the concentration of combustible gas inside the cabinet 210 reaches a preset value, the temperature inside the cabinet 210 reaches a preset value, the smoke concentration inside the cabinet 210 reaches a preset value, etc. This embodiment does not limit the types or number of parameters included in the above-mentioned "abnormal changes," only ensuring accurate early warning of fire-fighting explosion situations within the cabinet 210.

[0058] In one example, the drive is further configured to provide closing power to the explosion relief plate 220 and keep the explosion relief plate 220 closed under non-preset conditions, or to remove the opening power to the explosion relief plate 220 under non-preset conditions, so that the explosion relief plate 220 closes under its own gravity or the driving action of other restoring elements, i.e., covering the explosion relief port 211.

[0059] For example, the driving element can be an elastic element, such as a torsion spring, a spring, or an elastic telescopic rod, used to automatically drive the explosion relief panel 220 to open. This example does not limit the type of driving element.

[0060] In one example, see Figure 4 The flame arrestor 230 and the explosion relief plate 220 are located on the same side of the cabinet 210 and are configured to prevent the flame stream ejected from the explosion relief port 211 from spreading outward. The number of explosion relief plates 220 and flame arrestor 230 is the same as the number of explosion relief ports 211, and one explosion relief port 211 corresponds to one explosion relief plate 220 and one flame arrestor 230.

[0061] For example, the cabinet 210 is provided with two explosion vents 211, each explosion vent 211 is covered with an explosion vent plate 220, and a corresponding fire arrestor component 230 is provided.

[0062] The flow guiding structure 231 is configured to guide the flame flow overflowing from the explosion vent 211.

[0063] In one example, see Figure 6 The flow guiding structure 231 can be a hollow structure, and the internal cavity of the hollow structure forms the flow guiding channel 2311.

[0064] In one example, combined Figure 6When the explosion relief plate 220 is not open, i.e., when the explosion relief plate 220 covers the explosion relief port 211, the flow guiding channel 2311 and the explosion relief port 211 are separated by the explosion relief plate 220. The flow guiding channel 2311 and the explosion relief port 211 are independent of each other and are not connected. Figure 8 When the explosion relief plate 220 is opened to expose the explosion relief port 211 for explosion relief, the flow guiding channel 2311 is connected to the explosion relief port 211, and the flow guiding channel 2311 guides the flame flow overflowing from the explosion relief port 211.

[0065] In one example, the dimension of the flow guide structure 231 along the height direction Z of the cabinet 210 is greater than or equal to 600 mm and less than or equal to 700 mm. For example, the dimension of the flow guide structure 231 along the height direction Z of the cabinet 210 is 600 mm, 620 mm, 640 mm, 660 mm, 680 mm or 700 mm.

[0066] The flame arrestor 232 is configured to prevent the flame stream overflowing from the explosion vent 211 from continuing to spread outward. In one example, the flame arrestor 232 is configured to extinguish the flame overflowing from the explosion vent 211 to reduce the threat posed by the flame stream to the external environment and personnel safety.

[0067] In one example, the flame arrestor structure 232 is directly connected to the flow guide structure 231, and the flame flow in the flow guide structure 231 directly enters the flame arrestor structure 232.

[0068] For example, the flame-arresting structure 232 and the flow-guiding structure 231 can be connected and fixed using a connector to facilitate the inspection and replacement of the flame-arresting structure 232 and / or the flow-guiding structure 231. The connector can be a flange.

[0069] Of course, in other examples, the flame arrestor structure 232 can also be welded together with the flow guiding structure 231.

[0070] In this embodiment, by setting an explosion relief plate 220 at the explosion relief port 211 and movably connecting the explosion relief plate 220 to the cabinet 210, pressure can be relieved by opening the explosion relief plate 220 to expose the explosion relief port 211 when the pressure inside the cabinet 210 is too high. Furthermore, the explosion relief plate 220 can be closed again after the explosion to cover the explosion relief port 211, enabling the reuse of the explosion relief plate 220. Compared to a disposable explosion relief plate 220, there is no need to replace the explosion relief plate 220 after the explosion, simplifying operation. In addition, by setting a flame arrestor structure 232 on the outside of the explosion relief port 211, the flame can be effectively prevented from spreading outwards during the explosion without obstructing gas flow, greatly reducing the safety threat to the external environment and personnel during the explosion. Moreover, by setting a flow guide structure 231 between the flame arrestor structure 232 and the explosion relief port 211, the flow guide structure 231 can guide the explosion relief flame flow in a predetermined direction, reducing the risk of the flame spreading in all directions. On the other hand, the flow guiding structure 231 can evenly disperse the explosion shock wave, directing the explosion flame flow to the entire area of ​​the flame arrestor structure 232 for flame arrest and extinguishing. Simultaneously, the flow guiding structure 231 can slow down the flow velocity of the flame, reducing the risk of damage to the flame arrestor structure 232 due to localized high impact forces. Furthermore, since the explosion produces large particles such as high-temperature agglomerates, dust clumps, and molten residue, the flow guiding structure 231 can provide initial buffering and settling. The large particles collide with the sidewalls of the flow guiding structure 231, slowing down their settling and reducing direct impact and adhesion of high-temperature residue to the flame arrestor structure 232, thus extending its service life and reducing cleaning frequency.

[0071] In one embodiment, see Figure 6 The extension direction of the flow channel 2311 is parallel to the axial direction of the explosion vent 211.

[0072] In one example, the flow channel 2311 is elongated and extends along the height direction Z of the cabinet 210.

[0073] In this embodiment, by making the extension direction of the flow guiding channel 2311 parallel to the axial direction of the explosion vent 211, the flow guiding channel 2311 can be made into a straight channel, and the flow guiding direction of the flow guiding channel 2311 is the same as the direction of the flame stream ejected from the explosion vent 211. This allows the flame stream ejected from the explosion vent 211 to directly enter the flow guiding channel 2311 and be straight-lined out through the flow guiding channel 2311, resulting in a shorter flow path and enabling rapid fire extinguishing. Moreover, compared to a curved flow guiding channel, the impact force of the flame stream on the side wall of the flow guiding structure 231 is smaller, which can reduce the risk of the flow guiding structure 231 becoming loose from repeated impacts by the flame stream and the connection between it and the cabinet 210, and the flame overflowing from the gap between the flow guiding structure 231 and the cabinet 210.

[0074] In one embodiment, see Figure 6 The flow guiding channel 2311 and the explosion vent 211 are coaxially arranged. In this way, the overlap area between the flow guiding channel 2311 and the explosion vent 211 is larger, which is more conducive to the flame flow ejected from the explosion vent 211 entering the flow guiding channel 2311.

[0075] The central axis of the guide flow channel 2311 is coaxially arranged to coincide with the central axis of the explosion vent 211.

[0076] In one example, the cross-sectional area of ​​the flow channel 2311 is larger than that of the explosion vent 211, so that the flame stream ejected from the explosion vent 211 can all enter the flow channel 2311, reducing the risk of flame stream overflow.

[0077] The shapes of the cross-sections of the explosion vent 211 and the flow guiding channel 2311 are not limited. For example, the explosion vent 211 can be a circular opening or a square hole. The flow guiding channel 2311 is a square hole.

[0078] In one embodiment, see Figure 6 and Figure 8 The orthographic projection of the flow channel 2311 onto the cabinet 210 covers the entire explosion relief plate 220. Thus, the explosion relief plate 220 can be freely opened or closed within the flow channel 2311, reducing the impact of the flow structure 231 on the explosion relief process.

[0079] In one example, the flow guide structure 231 is directly connected to the cabinet 210, the explosion relief plate 220 is also connected to the cabinet 210, and the explosion relief plate 220 is located inside the flow guide channel 2311.

[0080] In one example, the circumferential edge of the explosion relief plate 220 is spaced apart from the inner wall of the flow channel 2311 to reduce the impact of friction between the explosion relief plate 220 and the inner wall of the flow channel 2311 on the explosion relief process.

[0081] In one example, the cross-section of the flow channel 2311 is square, such as a rectangular shape. The explosion relief plate 220 is a square plate.

[0082] In one embodiment, see Figure 8 and Figure 9 , Figure 9 This is a vertical cross-sectional view of a flame-arresting structure 232 provided in one embodiment of this application. The flame-arresting structure 232 includes a hollow shell 2321 and a mesh structure 2322. The hollow shell 2321 is connected to the side of the flow guiding structure 231 opposite to the explosion vent 211. The mesh structure 2322 is disposed inside the hollow shell 2321 and communicates with the flow guiding channel 2311.

[0083] In one example, the hollow shell 2321 is a hollow structure with openings at both ends, and the first opening of the hollow shell 2321 is connected to the flow channel 2311.

[0084] In one example, the hollow shell 2321 is connected to the flow guiding structure 231.

[0085] In one example, see Figure 8 The mesh structure 2322 includes multiple mesh openings 2323. When the flame stream enters the mesh structure 2322, the mesh openings 2323 divide the flame stream into many small flame streams, which are extinguished by the heat dissipation effect of the mesh openings 2323 and the wall effect.

[0086] Among them, mesh 2323 includes, but is not limited to, woven mesh, straight slits, honeycomb through holes, corrugated microchannels, sintered micropores, etc.

[0087] The heat dissipation effect refers to the following: when the flame stream enters the fine mesh 2323 of the mesh structure 2322, it is cut into many fine flame streams. Because these fine mesh 2323 have a large heat transfer area, the heat carried by the flame is rapidly transferred to the sidewalls of the mesh 2323, causing the flame's own temperature to drop sharply. When the temperature drops below the ignition point of the combustible material, the flame will extinguish due to insufficient heat.

[0088] The wall effect (chain reaction theory) states that combustion relies on high-energy free radicals for sustaining it. When the flame stream enters the extremely narrow mesh 2323, the probability of free radicals colliding with the sidewalls of the mesh 2323 increases dramatically. Free radicals are absorbed and greatly reduced during these collisions. When the number of free radicals decreases to the point where they can no longer sustain the chemical reaction, the chain reaction of combustion is interrupted, and the flame extinguishes.

[0089] In one example, see Figure 9 The mesh structure 2322 includes a plurality of first baffles spaced apart along a first direction X, with two adjacent first baffles defining a mesh opening 2323. The first direction X is perpendicular to the height direction Z of the cabinet 210. It can be understood that in this example, the mesh opening 2323 is a long, narrow slit.

[0090] For example, each of the first baffles extends at both ends along the second direction Y and abuts against the inner wall surface of the hollow shell 2321.

[0091] For example, along the height direction Z of the cabinet 210, the ratio of the size of each first baffle to the size of the hollow shell 2321 is greater than or equal to 0.5 and less than or equal to 1. For example, along the height direction Z of the cabinet 210, the ratio of the size of each first baffle to the size of the hollow shell 2321 is 0.5, 0.6, 0.7, 0.8, 0.9 or 1.

[0092] In another example, the mesh structure 2322 may further include a plurality of second baffles spaced apart along a second direction Y. The second direction Y is perpendicular to the height direction Z of the cabinet 210 and intersects with the first direction X. For example, the second direction Y is perpendicular to the first direction X. It can be understood that in this example, the mesh 2323 is a grid.

[0093] For example, each of the second baffles extends to both ends along a third direction and abuts against the inner wall surface of the hollow shell 2321. The third direction may be parallel to or intersect with the first direction X, and the third direction may intersect with the second direction Y.

[0094] For example, along the height direction Z of the cabinet 210, the ratio of the size of each second baffle to the size of the hollow shell 2321 is greater than or equal to 0.5 and less than or equal to 1. For example, along the height direction Z of the cabinet 210, the ratio of the size of each second baffle to the size of the hollow shell 2321 is 0.5, 0.6, 0.7, 0.8, 0.9 or 1.

[0095] For example, the cross-section of the first baffle and / or the second baffle can be a plane or a curved surface. A curved surface is, for example, a corrugated surface.

[0096] In this embodiment, by setting the mesh structure 2322, the flame stream can be divided into many small flame streams by the mesh structure 2322. These small flame streams are extinguished by the heat dissipation effect of the mesh structure 2322 and the wall effect. In addition, by setting the hollow shell 2321 and placing the mesh structure 2322 inside the hollow shell 2321, the flame arrestor structure 232 can be adapted to flow guide structures 231 of different shapes to achieve a stable connection with the flow guide structure 231 of the corresponding shape, thereby expanding the scope of application.

[0097] In one embodiment, see Figure 8 The mesh structure 2322 includes multiple mesh openings 2323, the aperture L of which is less than 0.5 mm. This increases the probability that the flame stream will be extinguished as it passes through the mesh openings 2323, thus achieving reliable flame arrestion of the mesh structure 2322.

[0098] In one example, the aperture L of mesh 2323 can be 0.1, 0.2, 0.3 or 0.4.

[0099] Wherein, when the mesh 2323 is a slit or a linear channel, the aperture L of the mesh 2323 refers to the width of the slit or linear channel.

[0100] In one embodiment, see Figures 4 to 6The flame arrestor assembly 230 also includes a pressure relief structure 233. The pressure relief structure 233 includes a pressure relief channel 2331, which is connected to the flow guiding channel 2311 and the flame arrestor structure 232 respectively, and the cross-sectional area of ​​the pressure relief channel 2331 gradually increases in the direction away from the explosion vent 211.

[0101] In one example, see Figure 6 The pressure relief channel 2331 has an inverted trapezoidal cross section along the height direction Z of the cabinet 210.

[0102] In one example, at the connection between the pressure relief channel 2331 and the flow guide channel 2311, the cross-sectional area of ​​the pressure relief channel 2331 is the same as that of the flow guide channel 2311. At the connection between the pressure relief channel 2331 and the flame arrestor structure 232, the cross-sectional area of ​​the pressure relief channel 2331 is the same as that of the hollow structure of the hollow shell 2321.

[0103] In this embodiment, the flame flow overflowing from the explosion vent 211 can rapidly expand within the pressure relief channel 2331, significantly reducing the pressure peak. Furthermore, the pressure relief section disperses the concentrated airflow, evenly distributing the flame flow shock wave across the entire flame-arresting structure 232, resulting in a substantial decrease in load per unit area. This effectively reduces the risk of deformation of the mesh 2323 of the mesh structure 2322 under the influence of the flame flow, increasing the probability of the flame flow being stably extinguished by the mesh structure 2322. Additionally, the velocity of high-speed, high-temperature flame flow and large particles of debris drops sharply upon entering the pressure relief channel 2331, causing the large particles to settle within the channel. This reduces the risk of high-temperature, large particles of debris directly adhering to and eroding the mesh 2323 of the flame-arresting structure 232, or even clogging the mesh 2323, leading to flame-arresting failure.

[0104] In one embodiment, see Figure 6 The pressure relief structure 233 is connected between the flow guiding structure 231 and the flame arrestor structure 232. In this way, the influence of the pressure relief structure 233 on the opening or closing process of the explosion relief plate 220 can be reduced.

[0105] In one example, the pressure relief structure 233 is directly connected to the flow guiding structure 231 and the flame arrestor structure 232, respectively.

[0106] Of course, in other examples, the pressure relief structure 233 can also be connected to the side of the flow guide structure 231 facing the explosion relief port 211. In this case, the orthogonal projection of the pressure relief channel 2331 on the cabinet 210 covers the entire explosion relief plate 220, so as to reduce the impact of the pressure relief channel 2331 on the opening or closing process of the explosion relief plate 220.

[0107] In one embodiment, see Figure 4 The pressure relief structure 233 is integrally formed with the hollow shell 2321.

[0108] In one example, the cross-sectional area of ​​the hollow structure of the hollow shell 2321 is the same as the cross-sectional area of ​​the pressure relief channel 2331 near the flame arrestor structure 232.

[0109] In one example, the hollow shell 2321 extends along the height direction Z of the cabinet 210 and is directly connected to the flow guide structure 231. The portion of the hollow shell 2321 closest to the flow guide structure 231 serves as a pressure relief structure 233, defining a pressure relief channel 2331. A mesh structure 2322 is disposed within the portion of the hollow shell 2321 opposite to the flow guide structure 231.

[0110] This embodiment can increase the connection strength and reliability between the pressure relief structure 233 and the flame arrestor structure 232, and reduce the risk of flame flow overflowing from the gap between the pressure relief structure 233 and the flame arrestor structure 232.

[0111] In one embodiment, see Figure 4 The circumferential profile of the flow channel 2311 matches the circumferential profile of the explosion relief plate 220; and / or the circumferential profile of the hollow shell 2321 matches the circumferential profile of the flow guiding structure 231. This facilitates the installation and positioning of the various structural components in the fire arrestor assembly 230 and minimizes the radial dimension of the fire arrestor assembly 230 as much as possible.

[0112] The circumferential profile of the explosion vent 220 refers to the outer edge profile of the explosion vent 220.

[0113] In one example, the hollow shell 2321 is fitted over and connected to the flow guide structure 231. In this example, the circumferential profile of the hollow shell 2321 refers to the inner edge profile of the hollow shell 2321. The circumferential profile of the flow guide structure 231 refers to the outer edge profile of the flow guide structure 231.

[0114] In another example, a portion of the hollow shell 2321 extends into and connects to the flow guide structure 231. In this example, the circumferential profile of the hollow shell 2321 refers to the outer edge profile of the hollow shell 2321. The circumferential profile of the flow guide structure 231 refers to the circumferential profile of the flow channel 2311.

[0115] In one example, the circumferential profile of the flow channel 2311 matches the circumferential profile of the explosion relief plate 220. Alternatively, the circumferential profile of the hollow shell 2321 matches the circumferential profile of the flow guiding structure 231.

[0116] In one example, the circumferential profile of the flow channel 2311 matches the circumferential profile of the explosion relief plate 220. And the circumferential profile of the hollow shell 2321 matches the circumferential profile of the flow guiding structure 231.

[0117] In one example, the circumferential profiles of the flow channel 2311, the explosion relief plate 220, the hollow shell 2321, and the flow guiding structure 231 are all polygonal, such as squares or rectangles.

[0118] Of course, in other examples, the circumferential profile of the flow channel 2311, the circumferential profile of the explosion relief plate 220, the circumferential profile of the hollow shell 2321, and the circumferential profile of the flow guiding structure 231 may all be circular.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage device, characterized in that, include: The cabinet has an explosion vent; An explosion relief plate is movably connected to the cabinet to cover or expose the explosion relief vent. A fire-arresting assembly is disposed on the outside of the cabinet, the fire-arresting assembly comprising: A flow guiding structure having a flow guiding channel configured to communicate with the explosion relief port; A flame arrestor structure is connected to the side of the flow guiding structure opposite to the explosion vent and is connected to the flow guiding channel.

2. The energy storage device according to claim 1, characterized in that, The direction of the flow channel is parallel to the axial direction of the explosion vent.

3. The energy storage device according to claim 2, characterized in that, The flow channel is coaxially arranged with the explosion vent.

4. The energy storage device according to claim 1, characterized in that, The orthogonal projection of the flow channel on the cabinet covers the entire explosion relief plate.

5. The energy storage device according to claim 1, characterized in that, The fire-retardant structure includes: A hollow shell is connected to the side of the flow guiding structure opposite to the explosion vent. A mesh structure is disposed inside the hollow shell and communicates with the flow channel.

6. The energy storage device according to claim 5, characterized in that, The mesh structure includes multiple mesh openings, the opening diameter of which is less than 0.5 mm.

7. The energy storage device according to claim 5, characterized in that, The flame arrestor assembly also includes: The pressure relief structure includes a pressure relief channel, which is connected to the flow guiding channel and the flame arrestor structure respectively, and the cross-sectional area of ​​the pressure relief channel gradually increases in the direction away from the explosion vent.

8. The energy storage device according to claim 7, characterized in that, The pressure relief structure is connected between the flow guiding structure and the flame arrestor structure.

9. The energy storage device according to claim 8, characterized in that, The pressure relief structure is integrally formed with the hollow shell.

10. The energy storage device according to any one of claims 5-9, characterized in that, The circumferential profile of the flow guide channel matches the circumferential profile of the explosion relief plate; and / or The circumferential profile of the hollow shell matches the circumferential profile of the flow guiding structure.

11. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device as described in any one of claims 1-10, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

12. A charging network, characterized in that, It includes a charging pile and an energy storage device as described in any one of claims 1-10, wherein the energy storage device is used to provide electrical energy to the charging pile.

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