Energy storage device, energy storage system and charging network

Abstract

The embodiment of the present application provides a kind of energy storage device, energy storage system and charging network.Energy storage device includes cabinet, battery cell and exhaust component.Cabinet has accommodating space, and cabinet includes first wall part.Battery cell is accommodated in accommodating space.Exhaust component is arranged in first wall part, and exhaust component includes wind collecting pipe, connecting pipe and gradually expanding pipe, gradually expanding pipe has opposite first end and second end in its extension direction, the flow area of first end is less than the flow area of second end, connecting pipe is connected to first end, and second end is located outside cabinet, wind collecting pipe is connected to connecting pipe, connecting pipe has first flow channel and second flow channel, first flow channel is communicated gradually expanding pipe and wind collecting pipe, and second flow channel is communicated gradually expanding pipe and accommodating space.Such energy storage device can improve its own reliability.

Description

Technical Field

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

[0002] With the rapid development of technology, electricity has become an indispensable energy source in people's production and daily life. To improve the smoothness of electricity supply and ensure the normal operation of production and daily life, energy storage devices are needed. As devices that cyclically store and release electrical energy, energy storage devices store electrical energy or supply the stored energy to electrical devices through charging or discharging. Energy storage devices are widely used in industrial power supply, household power supply, temporary power supply, mobile power supply, wind power generation, solar power generation, and energy storage power stations.

[0003] In the development of energy storage devices, besides improving their reliability, volumetric energy density is also a crucial issue. Therefore, how to increase the volumetric energy density of energy storage devices is a continuous technical challenge in energy storage technology. Utility Model Content

[0004] This application provides an energy storage device, an energy storage system, and a charging network, which can improve the volumetric energy density of the energy storage device.

[0005] In a first aspect, embodiments of this application provide an energy storage device, including a cabinet, a battery cell, and an exhaust assembly; the cabinet has an accommodating space and includes a first wall; the battery cell is accommodated within the accommodating space; the exhaust assembly is disposed on the first wall and includes a collecting pipe, a connecting pipe, and a diffuser; the diffuser has a first end and a second end opposite to each other in its extending direction, the flow area of ​​the first end is smaller than the flow area of ​​the second end, the connecting pipe is connected to the first end, the second end is located outside the cabinet, the collecting pipe is connected to the connecting pipe, the connecting pipe has a first flow channel and a second flow channel, the first flow channel connects the diffuser and the collecting pipe, and the second flow channel connects the diffuser and the accommodating space.

[0006] In the above technical solution, by setting the flow area at the first end to be smaller than that at the second end, and by connecting the diffuser and the air collecting pipe in the first flow channel, when the air collecting pipe blows air into the diffuser through the first flow channel, the airflow in the diffuser gradually slows down as the flow area of ​​the diffuser gradually increases. The airflow, flowing along the inner wall of the diffuser, can create a negative pressure area at the first end of the diffuser. This negative pressure area can then draw gas from the containment space away from the cabinet through the second flow channel, achieving exhaust of the energy storage device. This reduces the risk of fire and explosion of the energy storage device and improves its reliability. The smaller size of the exhaust component reduces its space occupation and the volume of the exhaust component outside the cabinet, allowing for more battery cells to be accommodated within the containment space while reducing the overall volume of the energy storage device and increasing its volumetric energy density. This type of energy storage device balances improved reliability and increased volumetric energy density, thus enhancing its performance.

[0007] In some embodiments, along the extending direction of the connecting pipe, the connecting pipe has a third end and a fourth end opposite to each other, with the third end being closer to the second end than the fourth end. A second flow channel passes through the third end and the fourth end, and the third end is provided with an air outlet that connects to the first flow channel and the diffuser. By setting the second flow channel to pass through the third end, and the air outlet of the third end to connect to the first flow channel, when the air collecting pipe blows air into the diffuser through the first flow channel, a negative pressure can be formed at the air outlet, thereby drawing the gas in the second flow channel away from the second flow channel from the fourth end to the third end, and thus drawing the gas in the containing space out of the cabinet, realizing the exhaust of the cabinet, reducing the risk of fire and explosion of the cabinet, and improving the reliability of the energy storage device.

[0008] In some embodiments, the third end is provided with multiple air outlets communicating with the first flow channel, and the multiple air outlets are arranged at intervals along the circumference of the second flow channel. In this way, the multiple air outlets can make the air outlets of the first flow channel more uniform and the exhaust air of the second flow channel more stable, thereby improving the exhaust effect of the cabinet.

[0009] In some embodiments, the first flow channel surrounds the second flow channel. This reduces the difficulty of setting up the first flow channel and lowers the cost of setting up the connecting pipe.

[0010] In some embodiments, the minimum flow area of ​​the air outlet is 10 mm². 2 -30mm 2 The minimum flow area of ​​the air outlet is greater than or equal to 10mm². 2 This allows for an increase in the diameter of the air outlet, reducing the risk of it being blocked; the minimum flow area of ​​the air outlet is less than or equal to 30mm². 2 This design ensures that the airflow velocity at the air outlet is not too low, thereby enhancing the negative pressure effect at the air outlet and improving the cabinet's exhaust efficiency; therefore, the minimum flow area at the air outlet is 10mm.2 -30mm 2 It can balance reducing the risk of the air outlet being blocked and improving the ventilation effect of the cabinet.

[0011] In some embodiments, the inner wall of the diffuser intersects with the first longitudinal section to form two inclined first intersection lines. The distance between the two first intersection lines gradually increases in the direction from the first end to the second end. The angle between the first intersection line and the centerline of the diffuser is 8-15 degrees, and the centerline of the diffuser is located within the first longitudinal section. An angle greater than or equal to 8 degrees between the first intersection line and the centerline of the diffuser allows the diffuser to expand outwards in the direction from the first end to the second end, thereby improving the effect of forming a negative pressure area within the diffuser and thus improving the exhaust effect of the second flow channel. An angle less than or equal to 15 degrees between the first intersection line and the centerline of the diffuser reduces the risk of vortex formation within the diffuser, improves the adhesion of the airflow to the diffuser wall, reduces the impact of vortices on the formation of negative pressure within the diffuser, and improves the exhaust effect of the second flow channel. Therefore, an angle of 8-15 degrees between the first intersection line and the centerline of the diffuser can balance improving the formation of negative pressure within the diffuser and reducing the risk of vortex formation within the diffuser, thus improving the exhaust effect of the second flow channel.

[0012] In some embodiments, the energy storage device further includes a converging tube having a fifth end and a sixth end, wherein the flow area of ​​the fifth end is smaller than that of the sixth end, the fifth end is connected to the end of the second flow channel away from the diffuser tube, and the sixth end is connected to the accommodating space. By providing the converging tube, the airflow at the sixth end can be concentrated, thereby facilitating the exhaust of gas from the accommodating space into the cabinet and improving the exhaust effect of the cabinet.

[0013] In some embodiments, the inner wall of the tapered tube intersects with the second longitudinal section to form two inclined second intersection lines. The distance between the two second intersection lines gradually increases in the direction from the fifth end to the sixth end. The angle between the second intersection line and the centerline of the tapered tube is 20-30 degrees, and the centerline of the tapered tube is located within the second longitudinal section. An angle greater than or equal to 20 degrees between the second intersection line and the centerline of the tapered tube can reduce the risk of poor exhaust effect due to the small flow area at the sixth end inside the cabinet, thus improving the exhaust effect of the tapered tube. An angle less than or equal to 30 degrees between the second intersection line and the centerline of the tapered tube can reduce the area occupied by the tapered tube and save on the installation cost. Therefore, an angle of 20-30 degrees between the second intersection line and the centerline of the tapered tube can balance improving the exhaust effect of the tapered tube and reducing its installation cost.

[0014] In some embodiments, the inner wall surface of the converging tube is coated with a coating, the coefficient of dynamic friction of which is greater than that of the inner wall surface of the converging tube. This reduces the air resistance of the converging tube and improves its exhaust performance.

[0015] In some embodiments, a flow-rectifying grid is provided inside the diffuser, and the flow-rectifying grid is spaced apart from the connecting pipe. This reduces the risk of eddies forming inside the diffuser and enhances the effect of creating negative pressure inside the diffuser, thereby improving the exhaust performance of the exhaust assembly.

[0016] In some embodiments, the rectifier grille is provided with multiple rectifier channels, each having a seventh end and an eighth end. The seventh end is closer to the connecting pipe than the eighth end, and the flow area of ​​the seventh end is smaller than that of the eighth end. This results in a higher gas velocity at the seventh end than at the eighth end, which facilitates the formation of a negative pressure at the seventh end, promoting the discharge of airflow from the diffuser pipe and improving the ventilation effect of the cabinet.

[0017] Secondly, embodiments of this application provide an energy storage system, including a gas supply device and the energy storage device provided in any of the embodiments of the first aspect. The gas supply device is connected to an air collection pipe and supplies compressed air to the air collection pipe.

[0018] In some embodiments, the air supply device has an air inlet equipped with a filter. This reduces the risk of impurities in the air entering the air inlet pipe, thereby reducing the risk of the air outlet being blocked and improving the exhaust effect of the exhaust assembly.

[0019] In some embodiments, a first detection unit is provided inside the cabinet. The first detection unit is configured to detect the concentration of at least one combustible gas inside the cabinet. A gas supply device communicates with the first detection unit and is used to adjust the delivery flow rate of compressed air according to the concentration of combustible gas. In this way, when the concentration of combustible gas is high, the flow rate of the gas supplied by the air collection duct can be increased, thereby improving the exhaust capacity of the exhaust assembly, reducing the risk of fire and explosion of the energy storage system, and extending the service life of the energy storage system.

[0020] Thirdly, embodiments of this application provide a charging network, including a charging pile and an energy storage device provided in any of the embodiments of the first aspect, wherein the energy storage device is used to provide electrical energy to the charging pile. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This application provides schematic diagrams of the structure of an energy storage system according to some embodiments. Figure 2 This is a schematic diagram of the structure of a charging network provided in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application; Figure 4 for Figure 3 AA section view; Figure 5 This is a schematic diagram of the structure of the exhaust assembly provided in some embodiments of this application; Figure 6 for Figure 5 BB section view; Figure 7 This is a schematic diagram of the structure of an exhaust assembly provided in some embodiments of this application; Figure 8 This is a schematic diagram of the structure of the exhaust assembly provided in some embodiments of this application; Figure 9 This is a schematic diagram of the structure of an exhaust assembly provided in other embodiments of this application; Figure 10 for Figure 9 A magnified view of a portion of region C in the middle; Figure 11 A schematic diagram of the structure of an exhaust assembly provided in some embodiments of this application (showing a rectifier grille); Figure 12 This is a schematic diagram of the structure of an energy storage system provided in some embodiments of this application.

[0023] Icons: 1-Cabinet; 11-Accommodation space; 12-First wall; 13-Second wall; 131-Air inlet; 2-Battery cell; 3-Exhaust assembly; 31-Air collection duct; 32-Connecting pipe; 321-First flow channel; 3211-Air outlet; 322-Second flow channel; 3221-Exhaust outlet; 323-Third end; 324-Fourth end; 33-Diffuser; 331-First end; 332-Second end; 333-Inner wall of diffuser; 334-First intersection line; 335-Centerline of diffuser; 34-Converging pipe; 341-Fifth end; 342 - Sixth end; 343 - Inner wall of the tapered tube; 344 - Second intersection line; 345 - Center line of the tapered tube; 346 - Coating; 35 - Rectifying grid; 351 - Rectifying flow channel; 3511 - Seventh end; 3512 - Eighth end; 4 - First detection unit; 10 - Energy storage device; 20 - Gas supply device; 201 - Air inlet; 202 - Filter screen; 30 - Energy storage converter; 100 - Energy storage system; 200 - Power generation device; 300 - Charging network; 3001 - Charging pile; X - Length direction; Y - Width direction; Z - Height direction. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0026] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0029] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0030] In this application, "multiple" means two or more (including two).

[0031] In this application embodiment, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and this application embodiment is not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited thereto.

[0032] A single battery cell typically includes an electrode assembly. The electrode assembly comprises a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0033] Optionally, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0034] Optionally, the electrode assembly has a stacked structure.

[0035] Optionally, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0036] The battery device mentioned in the embodiments of this application may include a single physical module containing one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or mixed via a busbar.

[0037] In some embodiments, the battery device may be a battery module; when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0038] In some embodiments, the battery device may be a battery pack, which includes a housing and individual battery cells, wherein the individual battery cells or battery modules are housed in the housing.

[0039] In some embodiments, the energy storage device includes a cabinet and a battery unit housed within the cabinet. The battery unit includes multiple individual battery cells.

[0040] In some embodiments, the energy storage device may further include a control module for electrically controlling the battery device.

[0041] In some embodiments, the energy storage device may further include a thermal management module for managing the temperature of the battery device.

[0042] In some embodiments, the energy storage system includes an energy storage device and a converter, the converter being electrically connected to a battery cell to convert the DC power of the battery cell into AC power so as to enable the battery cell to output power, or to convert the AC power of an external circuit into DC power so as to enable the battery cell to store power.

[0043] Energy storage systems can include energy storage power stations, wind power systems, solar power systems, mobile power systems, or temporary power supply systems. Energy storage power stations store electrical energy during off-peak hours and provide power to users or electrical equipment during peak hours. Wind power systems collect wind energy from wind turbines, convert it into electricity, and then store it in an energy storage system. Solar power systems convert solar energy into electricity, store it in an energy storage system, and supply it to users as needed. Mobile power systems can power equipment in areas inaccessible by the mains grid, such as remote mountainous areas and isolated wilderness areas. Temporary power supply systems can provide power to users when there is insufficient electricity.

[0044] Power plants are placing increasingly higher demands on the reliability of energy storage devices. Energy storage devices typically require fans to expel gases from the enclosure, thereby reducing the concentration of flammable gases and lowering the ambient temperature inside the enclosure to mitigate the risk of fire and explosion. However, fans occupy space within the energy storage device, affecting its volumetric energy density. Therefore, a conflict arises between the ventilation requirements of the energy storage device and its volumetric energy density.

[0045] In view of this, this application proposes an energy storage device, including a cabinet, a battery cell, and an exhaust assembly; the cabinet has an accommodating space and includes a first wall; the battery cell is accommodated within the accommodating space; the exhaust assembly is disposed on the first wall and includes a collecting pipe, a connecting pipe, and a diffuser. The diffuser has a first end and a second end opposite to each other in its extending direction, the flow area of ​​the first end is smaller than the flow area of ​​the second end, the connecting pipe is connected to the first end, the second end is located outside the cabinet, the collecting pipe is connected to the connecting pipe, and the connecting pipe has a first flow channel and a second flow channel. The first flow channel connects the diffuser and the collecting pipe, and the second flow channel connects the diffuser and the accommodating space.

[0046] In such an energy storage device, by setting the flow area at the first end to be smaller than that at the second end, and by connecting the first flow channel to the diffuser and the air collecting pipe, when the air collecting pipe blows air into the diffuser through the first flow channel, the airflow in the diffuser slows down as the flow area of ​​the diffuser gradually increases, so as to form a negative pressure zone at the first end of the diffuser. The negative pressure zone draws the gas in the containment space out of the cabinet through the second flow channel. On the one hand, this reduces the risk of fire and explosion due to the high concentration of combustible gas in the containment space, and on the other hand, it discharges the high-temperature gas in the containment space, reduces the temperature of the energy storage device, and improves the reliability of the energy storage device.

[0047] The following description, in conjunction with the accompanying drawings, illustrates the energy storage device and the energy storage system using the energy storage device.

[0048] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of an energy storage system 100 provided in some embodiments of this application. Embodiments of this application provide an energy storage system 100. The energy storage system 100 includes an energy storage converter 30, which can be electrically connected to a power generation device 200 to convert the electrical power provided by the power generation device 200. The energy storage system 100 may also include an energy storage device 10, which is electrically connected to the energy storage converter 30. The energy storage converter 30 converts the electrical energy provided by the power generation device 200 and stores it in the energy storage device 10.

[0049] A power conversion device is used to connect the power generation device 200 and the energy storage device 10. The power generation device 200 generates electrical energy and stores the generated electrical energy in the energy storage device 10 via the power conversion device. The use of the energy storage device 10 in the energy storage system 100 can effectively improve the operational safety of the energy storage system 100. In specific implementations, the power generation equipment can be solar panels, hydroelectric power generation equipment, thermal power generation equipment, etc. The specific type of power generation equipment is not limited in this application.

[0050] As an example, such as Figure 1 As shown, the energy storage system 100 includes an energy storage device 10 and an energy storage converter 30. The two power generation devices 200 respectively transmit the generated electrical energy to the energy storage converter 30, and the energy storage converter 30 introduces the electrical energy into the energy storage device 10 for storage.

[0051] The energy storage device 10 includes a cabinet 1, and a battery device is installed inside the cabinet 1. The battery device includes a box and multiple battery cells 2, and the multiple battery cells 2 are housed inside the box.

[0052] As an example, the energy storage device 10 can be an energy storage container, an energy storage cabinet, etc.

[0053] As examples, energy storage device 10 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 10. Solar power generation systems can convert solar energy into electrical energy, store it in energy storage device 10, and supply it to users as needed. Mobile power systems can supply power to relevant electrical equipment in areas inaccessible by the mains grid, such as remote mountainous areas or isolated wilderness areas. Temporary power supply systems can provide power to users when there is insufficient electricity.

[0054] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a charging network provided in some embodiments of this application. Embodiments of this application provide a charging network 300, which includes a charging pile 3001 for charging electrical equipment. The charging network 300 may also include an energy storage device 10, which is electrically connected to the charging pile 3001 and provides electrical energy to the charging pile 3001.

[0055] It should be noted that the charging pile 3001 is electrically connected to the battery cell 2 in the energy storage device 10 via a cable. The battery cell 2 can supply its stored electrical energy to the charging pile 3001. The charging pile 3001 has a connector that can be connected to electrical equipment, thereby replenishing the energy of the equipment. The application of the energy storage device 10 in this charging network 300 can effectively improve the safety of the charging network 300 and also help to improve the flexibility of the charging network 300 during deployment.

[0056] In a charging network 300, there can be one charging pile 3001, and the energy storage device 10 provides power to one charging pile 3001; there can also be multiple charging piles 3001, and the energy storage device 10 provides power to multiple charging piles 3001.

[0057] As an example, such as Figure 3 As shown, the charging network 300 includes an energy storage device 10 and two charging piles 3001, with the energy storage device 10 providing power to the two charging piles 3001.

[0058] Please refer to Figures 3-6 , Figure 3 This is a schematic diagram of the structure of the energy storage device 10 provided in some embodiments of this application; Figure 4 for Figure 3 AA section view; Figure 5 This is a schematic diagram of the structure of the exhaust assembly 3 provided in some embodiments of this application; Figure 6 for Figure 5 A BB cross-sectional view. This application provides an energy storage device 10, including a cabinet 1, battery cells 2, and an exhaust assembly 3. The cabinet 1 has a receiving space 11 and includes a first wall 12. The battery cells 2 are received within the receiving space 11. The exhaust assembly 3 is disposed on the first wall 12 and includes a collecting pipe 31, a connecting pipe 32, and a diffuser 33. The diffuser 33 has a first end 331 and a second end 332 opposite each other in its extending direction. The flow area of ​​the first end 331 is smaller than the flow area of ​​the second end 332. The connecting pipe 32 is connected to the first end 331, and the second end 332 is located outside the cabinet 1. The collecting pipe 31 is connected to the connecting pipe 32. The connecting pipe 32 has a first flow channel 321 and a second flow channel 322. The first flow channel 321 connects the diffuser 33 and the collecting pipe 31, and the second flow channel 322 connects the diffuser 33 and the receiving space 11.

[0059] The first wall portion 12 is a wall portion of the cabinet 1. There can be one or more first wall portions 12. The first wall portion 12 can be the wall portion of the cabinet 1 located above the battery cell 2 along its height direction Z; it can also be at least one of two opposing wall portions of the cabinet 1 arranged along its length direction X; or it can be at least one of two opposing wall portions of the cabinet 1 arranged along its width direction Y. Wherein, the length direction X, width direction Y, and height direction Z of the cabinet 1 are all perpendicular to each other.

[0060] For example, such as Figure 3 and Figure 4 As shown, the first wall portion 12 is a wall portion provided along the length direction X of the cabinet body 1.

[0061] The number of battery cells 2 can be one or more. In embodiments where there are multiple battery cells 2, all of the multiple battery cells 2 are accommodated within the accommodating space 11.

[0062] The number of exhaust components 3 can be one or more. In an embodiment where there are multiple exhaust components 3 and one first wall portion 12, all multiple exhaust components 3 are disposed on the first wall portion 12. In an embodiment where there are multiple exhaust components 3 and multiple first wall portions 12, one first wall portion 12 may be provided with multiple exhaust components 3; or each first wall portion 12 may be provided with only one exhaust component 3.

[0063] The air collection duct 31 is used to receive gas supplied by the gas supply device and provide the gas to the connecting pipe 32. The gas supply device can be an air compressor, a gas booster pump, a gas storage tank, etc. The gas supply device can provide compressed air to the first flow channel 321. The air collection duct 31 can be located within the accommodating space 11; it can also be located outside the cabinet 1; or it can be embedded within the first wall portion 12.

[0064] The first end 331 and the second end 332 of the diffuser 33 are arranged opposite each other along the extension direction of the diffuser. The diffuser 33 includes a diffuser section, the flow area of ​​which gradually increases along the direction from the first section to the second end 332. The first end 331 and the second end 332 can be the two ends of the diffuser section respectively; or either the first end 331 or the second end 332 can be spaced apart from the diffuser section. The diffuser 33 can be entirely located outside the cabinet 1; or the second end 332 of the diffuser 33 can be located outside the cabinet 1, and the first end 331 can be located inside the cabinet 1. The extension direction of the diffuser 33 can be parallel to the length direction X.

[0065] The connecting pipe 32 is connected to the first end 331, and both the first flow channel 321 and the second flow channel 322 are connected to the diffuser 33 through the first end 331. The minimum flow area of ​​the first flow channel 321 and the minimum flow area of ​​the second flow channel 322 are both smaller than the minimum flow area of ​​the diffuser 33. The first flow channel 321 and the second flow channel 322 can be arranged side by side; the first flow channel 321 can be arranged around the second flow channel 322; or the second flow channel 322 can be arranged around the first flow channel 321. The connecting pipe 32 can be located inside the accommodating space 11; it can be located outside the cabinet 1; or it can be embedded in the first wall portion 12.

[0066] During the operation of the energy storage device 10, the air collection duct 31 supplies air to the first flow channel 321 through the air supply device. The high-pressure gas in the first flow channel 321 flows into the diffuser 33 and is blown out of the diffuser 33 from the first end 331 to the second end 332. Since the flow area of ​​the first end 331 of the diffuser 33 is smaller than that of the second end 332, according to the Venturi effect principle, a negative pressure area is formed near the opening of the first end 331 of the diffuser 33 to draw the gas in the second flow channel 322 into the diffuser 33 and discharge it, thereby realizing the extraction of the gas in the accommodating space 11 of the cabinet 1 to the outside of the cabinet 1.

[0067] In this embodiment, by setting the flow area of ​​the first end 331 to be smaller than that of the second end 332, and by connecting the first flow channel 321 to the diffuser 33 and the air collecting pipe 31, when the air collecting pipe 31 blows air into the diffuser 33 through the first flow channel 321, the airflow in the diffuser 33 slows down as the flow area of ​​the diffuser 33 gradually increases, so as to form a negative pressure zone at the first end 331 of the diffuser 33. The negative pressure zone draws the gas in the containment space 11 out of the cabinet 1 through the second flow channel 322. On the one hand, this reduces the risk of fire and explosion due to the high concentration of combustible gas in the containment space 11, and on the other hand, it discharges the high temperature gas in the containment space 11, reduces the temperature of the energy storage device 10, and extends the service life of the energy storage device 10. In addition, such an energy storage device 10 can reduce the space occupied by the exhaust component 3 in the housing space 11 and reduce the volume of the exhaust component 3 outside the cabinet 1, which is conducive to accommodating more battery cells 2 in the housing space 11 and reducing the volume occupied by the energy storage device 10, thereby improving the volumetric energy density of the energy storage device 10.

[0068] In some embodiments, please continue to refer to Figure 3 and Figure 4 The cabinet 1 also includes a second wall 13, which has an air inlet 131 connected to the accommodating space 11. When the exhaust assembly 3 exhausts gas from the cabinet 1, outside air enters the accommodating space 11 through the air inlet 131, thus replacing the gas inside the cabinet 1. The first wall 12 and the second wall 13 can be arranged adjacent to each other or opposite each other on both sides of the accommodating space 11.

[0069] In some embodiments, please continue to refer to Figure 6 Along the extension direction of the connecting pipe 32, the connecting pipe 32 has a third end 323 and a fourth end 324. The third end 323 is closer to the second end 332 than the fourth end 324. The second flow channel 322 passes through the third end 323 and the fourth end 324. The third end 323 is provided with an air outlet 3211, which connects the first flow channel 321 and the diffuser 33.

[0070] The extension direction of the connecting pipe 32 and the extension direction of the expanding pipe can be parallel.

[0071] The third end 323 of the connecting pipe 32 can be located outside the cabinet 1, and the fourth end 324 can be embedded in the first wall portion 12; or both the third end 323 and the fourth end 324 of the connecting pipe 32 can be located outside the cabinet 1; or both the third end 323 and the fourth end 324 can be located inside the cabinet 1. The second flow channel 322 passes through the third end 323 and the fourth end 324. The opening of the second flow channel 322 at the third end 323 is the exhaust port 3221. The airflow in the accommodating space 11 can enter the diffuser pipe 33 through the exhaust port 3221 in the direction from the fourth end 324 to the third end 323 in the second flow channel 322, and then be discharged from the energy storage device 10 in the direction from the first end 331 to the second end 332 in the diffuser pipe 33.

[0072] The air outlet 3211 and the exhaust port 3221 of the second flow channel 322 are both located at the third end 323. The compressed air provided by the air collection pipe 31 enters the first flow channel 321 and is blown into the diffuser 33 through the air outlet 3211, and is discharged from the energy storage device 10 from the diffuser 33 in the direction from the first end 331 to the second end 332.

[0073] In this embodiment, by setting the second flow channel 322 to pass through the third end 323, and the air outlet 3211 of the third end 323 to connect with the first flow channel 321, when the air collection pipe 31 blows air into the diffuser pipe 33 through the first flow channel 321, a negative pressure can be formed at the air outlet 3211, thereby drawing the gas in the second flow channel 322 away from the fourth end 324 in the direction of the third end 323, and then drawing the gas in the accommodating space 11 away from the cabinet 1, realizing the exhaust of the cabinet 1, reducing the risk of fire and explosion of the cabinet 1, and extending the service life of the energy storage device 10.

[0074] In some embodiments, please continue to refer to Figure 6 And further refer to Figure 7 , Figure 7 This is a schematic diagram of the structure of the exhaust assembly 3 provided in some embodiments of this application. The third end 323 is provided with a plurality of air outlets 3211 that communicate with the first flow channel 321, and the plurality of air outlets 3211 are arranged at intervals along the circumference of the second flow channel 322.

[0075] The number of first flow channels 321 can be one or more. In an embodiment where there is one first flow channel 321, multiple air outlets 3211 are all connected to the first flow channel 321. In an embodiment where there are multiple first flow channels 321, multiple first flow channels 321 can be arranged at intervals along the axial direction of the second flow channel 322, and each first flow channel 321 is provided with at least one air outlet 3211.

[0076] In this embodiment, multiple air outlets 3211 can make the air outlet of the first flow channel 321 more uniform, and make the exhaust of the second flow channel 322 more stable, thereby improving the exhaust effect of the cabinet 1.

[0077] In some embodiments, the first flow channel 321 is disposed around the second flow channel 322.

[0078] The first flow channel 321 has an annular structure, so that the first flow channel 321 surrounds the second flow channel 322. Multiple air outlets 3211 are connected to the first flow channel 321. After the high-pressure gas provided by the intake pipe enters the first flow channel 321, it is discharged into the diffuser 33 through the multiple air outlets 3211.

[0079] In this embodiment, by setting the first flow channel 321 to surround the second flow channel 322, the difficulty of setting the first flow channel 321 is reduced, and the cost of setting the connecting pipe 32 is reduced.

[0080] In some embodiments, the sum of the minimum flow areas of the plurality of air outlets 3211 is less than the minimum flow area of ​​the air collection duct 31.

[0081] In some embodiments, the minimum flow area of ​​the air outlet 3211 is 10 mm². 2 -30mm 2 .

[0082] The minimum flow area of ​​the air outlet 3211 can be 10mm². 2 11mm 2 12mm 2 13mm 2 14mm 2 15mm 2 16mm 2 17mm 2 18mm 2 19mm 2 20mm 2 21mm 2 22mm 2 23mm 2 24mm 2 25mm 2 26mm 2 27mm 2 28mm 2 29mm 2 30mm 2 The point value of any one of them or the point value between any two.

[0083] In this embodiment, the minimum flow area of ​​the air outlet 3211 is greater than or equal to 10 mm². 2 This allows for an increase in the diameter of the air outlet 3211, reducing the risk of it being blocked; the minimum flow area of ​​the air outlet 3211 is less than or equal to 30mm². 2This ensures that the airflow velocity at the air outlet 3211 is not too low, thereby enhancing the negative pressure effect at the air outlet 3211 and thus improving the exhaust effect of cabinet 1; therefore, the minimum flow area of ​​the air outlet 3211 is 10mm. 2 -30mm 2 It can both reduce the risk of the air outlet 3211 being blocked and improve the ventilation effect of the cabinet 1.

[0084] In some embodiments, please continue to refer to Figure 6 The inner wall surface 333 of the diffuser intersects with the first longitudinal section to form two inclined first intersection lines 334. The distance between the two first intersection lines 334 gradually increases in the direction from the first end 331 to the second end 332. The angle between the first intersection line 334 and the center line 335 of the diffuser is 8 degrees to 15 degrees. The center line 335 of the diffuser is located within the first longitudinal section.

[0085] like Figure 6 As shown, there are two first intersection lines 334, both of which are inclined oblique lines. The distance between each first intersection line 334 and the center line 335 of the diffuser gradually increases along the direction from the first end 331 to the second end 332. The angles between the two first intersection lines 334 and the center line 335 of the diffuser can be equal or unequal.

[0086] The angle between the first intersection line 334 and the center line 335 of the diffuser is α. α can be any value among 8 degrees, 8.2 degrees, 8.4 degrees, 8.6 degrees, 8.8 degrees, 9 degrees, 9.2 degrees, 9.4 degrees, 9.6 degrees, 9.8 degrees, 10 degrees, 10.2 degrees, 10.4 degrees, 10.6 degrees, 10.8 degrees, 11 degrees, 11.2 degrees, 11.4 degrees, 11.6 degrees, 11.8 degrees, 12 degrees, 12.2 degrees, 12.4 degrees, 12.6 degrees, 12.8 degrees, 13 degrees, 13.2 degrees, 13.4 degrees, 13.6 degrees, 13.8 degrees, 14 degrees, 14.2 degrees, 14.4 degrees, 14.6 degrees, 14.8 degrees, and 15 degrees, or any value between two of them.

[0087] In this embodiment, the angle between the first intersection line 334 and the center line 335 of the diffuser is greater than or equal to 8 degrees, which allows the diffuser 33 to expand outward from the first end 331 to the second end 332, thereby improving the effect of forming a negative pressure area inside the diffuser 33 and thus improving the exhaust effect of the second flow channel 322. The angle between the first intersection line 334 and the center line 335 of the diffuser is less than or equal to 15 degrees, which can reduce the risk of vortex formation in the airflow inside the diffuser 33, improve the adhesion effect of the airflow inside the diffuser 33 to the pipe wall of the diffuser 33, reduce the influence of vortex on the formation of negative pressure in the diffuser 33, and improve the exhaust effect of the second flow channel 322. Therefore, an angle of 8-15 degrees between the first intersection line 334 and the center line 335 of the diffuser can balance improving the effect of forming negative pressure inside the diffuser 33 and reducing the risk of vortex formation inside the diffuser 33, thereby improving the exhaust effect of the second flow channel 322.

[0088] In some embodiments, please refer to Figure 8 , Figure 8 This is a schematic diagram of the structure of the exhaust assembly 3 provided in some embodiments of this application. The energy storage device 10 also includes a converging tube 34, which has a fifth end 341 and a sixth end 342. The flow area of ​​the fifth end 341 is smaller than that of the sixth end 342. The fifth end 341 is connected to the end of the second flow channel 322 away from the expanding tube 33, and the sixth end 342 is connected to the accommodating space 11.

[0089] The tapered tube 34 is disposed on the side of the connecting tube 32 opposite to the expanding tube 33. The fifth end 341 of the tapered tube 34 is connected to the connecting tube 32, and the sixth end 342 of the tapered tube 34 can be located within the receiving space 11 so that the second flow channel 322 is connected to the second flow channel 322 through the tapered tube 34.

[0090] When air is blown into the diffuser 33 through the outlet 321 in the first flow channel 321, a negative pressure is generated at the first end 331 of the diffuser 33. The gas in the converging tube 34 is drawn into the diffuser 33 through the second flow channel 322. The gas in the containment space 11 near the sixth end 342 is discharged into the cabinet 1 through the converging tube 34.

[0091] In this embodiment, by setting a tapered tube 34, the tapered tube 34 can concentrate the airflow at the sixth end 342, which is conducive to exhausting the gas in the accommodating space 11 out of the cabinet 1 and improving the exhaust effect of the cabinet 1.

[0092] In some embodiments, please continue to refer to Figure 8The inner wall surface 343 of the tapered tube intersects with the second longitudinal section to form two inclined second intersection lines 344. The distance between the two second intersection lines 344 gradually increases in the direction from the fifth end 341 to the sixth end 342. The angle between the second intersection line 344 and the center line 345 of the tapered tube is 20 degrees to 30 degrees. The center line 345 of the tapered tube is located within the second longitudinal section.

[0093] like Figure 6 As shown, there are two second intersection lines 344, both of which are inclined oblique lines. The distance between each second intersection line 344 and the center line 345 of the tapered tube gradually increases along the direction from the fifth end 341 to the sixth end 342. The angles between the two second intersection lines 344 and the center line 345 of the tapered tube can be equal or unequal.

[0094] The centerline 345 of the converging tube and the centerline 335 of the diverging tube can be parallel.

[0095] The angle between the second intersection line 344 and the center line 345 of the tapered tube is β. β can be any one of the following values ​​or any value between two of the following: 20 degrees, 20.5 degrees, 21 degrees, 21.5 degrees, 22 degrees, 22.5 degrees, 23 degrees, 23.5 degrees, 24 degrees, 24.5 degrees, 25 degrees, 25.5 degrees, 26 degrees, 26.5 degrees, 27 degrees, 27.5 degrees, 28 degrees, 28.5 degrees, 29 degrees, 29.5 degrees, and 30 degrees.

[0096] In this embodiment, the angle between the second intersection line 344 and the center line 345 of the tapered tube is greater than or equal to 20 degrees, which can reduce the risk of poor exhaust effect due to the small flow area of ​​the sixth end 342 inside the cabinet 1, and improve the exhaust effect of the tapered tube 34; the angle between the second intersection line 344 and the center line 345 of the tapered tube is less than or equal to 30 degrees, which can reduce the area occupied by the tapered tube 34 and save the installation cost of the tapered tube 34; therefore, the angle between the second intersection line 344 and the center line 345 of the tapered tube is 20-30 degrees, which can balance improving the exhaust effect of the tapered tube 34 and reducing the installation cost of the tapered tube 34.

[0097] In some embodiments, please refer to Figure 9 and Figure 10 , Figure 9 This is a schematic diagram of the structure of the exhaust assembly 3 provided in other embodiments of this application; Figure 10 for Figure 9 A magnified view of region C. The inner wall surface 343 of the tapered tube is coated with a coating 346, and the coefficient of dynamic friction of the coating 346 is greater than that of the inner wall surface 343 of the tapered tube.

[0098] The coating 346 can cover the entire inner wall surface 343 of the tapered tube, or it can cover only a portion of the inner wall surface 343 of the tapered tube.

[0099] In this embodiment, the coefficient of dynamic friction of the coating 346 is greater than that of the inner wall surface 343 of the converging tube, which can reduce the wind resistance of the converging tube 34 and improve the exhaust effect of the converging tube 34.

[0100] In some embodiments, please refer to Figure 11 , Figure 11 This is a schematic diagram of the structure of the exhaust assembly 3 provided in some embodiments of this application (showing the rectifier grille 35). The rectifier grille 35 is provided inside the diffuser 33, and the rectifier grille 35 and the connecting pipe 32 are spaced apart along the extension direction of the diffuser.

[0101] The entire rectifier grille 35 may be located inside the diffuser 33; or only a portion of the rectifier grille 35 may be located inside the diffuser 33, while the other portion may be located outside the diffuser 33.

[0102] In this embodiment, the risk of eddy currents generated inside the diffuser 33 can be reduced, and the effect of forming negative pressure inside the diffuser 33 can be improved, thereby improving the exhaust effect of the exhaust assembly 3.

[0103] In some embodiments, the rectifier grille 35 is provided with a plurality of rectifier channels 351, each rectifier channel 351 having a seventh end 3511 and an eighth end 3512. The seventh end 3511 is closer to the connecting pipe 32 than the eighth end 3512, and the flow area of ​​the seventh end 3511 is smaller than the flow area of ​​the eighth end 3512.

[0104] Multiple rectifier channels 351 are arrayed and distributed, and the rectifier channels 351 can be honeycomb-shaped on the rectifier grid 35.

[0105] In this embodiment, the gas flow rate at the seventh end 3511 is greater than that at the eighth end 3512, which is conducive to the formation of negative pressure at the seventh end 3511, which is conducive to the discharge of airflow in the diffuser 33 and improves the ventilation effect of the cabinet 1.

[0106] Please refer to Figure 12 , Figure 12 This is a schematic diagram of the structure of an energy storage system 100 provided in some embodiments of this application. Embodiments of this application provide an energy storage system 100, including an air supply device 20 and an energy storage device 10 provided in any of the above embodiments. The air supply device 20 is connected to an air collection pipe 31 and supplies compressed air to the air collection pipe 31.

[0107] In some embodiments, please continue to refer to Figure 12 The air supply device 20 has an air inlet 201, and the air inlet 201 is equipped with a filter screen 202. In this embodiment, the risk of impurities in the air entering the air inlet pipe can be reduced, thereby reducing the risk of the air outlet 3211 being blocked and improving the exhaust effect of the exhaust assembly 3.

[0108] In some embodiments, a first detection unit 4 is provided inside the cabinet 1. The first detection unit 4 is configured to detect the concentration of at least one combustible gas inside the cabinet 1. The gas supply device 20 communicates with the first detection unit 4 and is used to adjust the delivery flow rate of compressed air according to the concentration of combustible gas.

[0109] The first detection unit 4 can be a combustible gas concentration sensor. The energy storage system 100 may include a controller, and the first detection unit 4 can send a signal to the controller based on the detected combustible gas concentration. The controller adjusts the power of the gas supply device 20 accordingly based on the signal, thereby adjusting the gas flow rate supplied by the gas supply device 20 to the gas collection pipe 31. The greater the gas flow rate, the greater the gas velocity.

[0110] In this embodiment, when the concentration of combustible gas is high, the flow rate of the gas supplied by the air collection pipe 31 can be increased, thereby improving the exhaust capacity of the exhaust component 3, reducing the risk of fire and explosion of the energy storage system 100, and extending the service life of the energy storage system 100.

[0111] This application provides a charging network, including a charging pile and an energy storage device provided in any of the above embodiments, wherein the energy storage device is used to provide electrical energy to the charging pile.

[0112] Please continue to refer to Figures 3-11This application provides an energy storage device 10, including a cabinet 1, a battery cell 2, and an exhaust assembly 3. The cabinet 1 has a receiving space 11 and includes a first wall 12. The battery cell 2 is received within the receiving space 11. The exhaust assembly 3 is disposed on the first wall 12 and includes a collecting pipe 31, a connecting pipe 32, a diffuser 33, and a contracting pipe 34. The diffuser 33 has a first end 331 and a second end 332 opposite each other in its extending direction. The flow area of ​​the first end 331 is smaller than that of the second end 332. The connecting pipe 32 is connected to the first end 331, and the second end 332 is located outside the cabinet 1. The collecting pipe 31 is connected to the connecting pipe 32, and a portion of the collecting pipe 31 is buried. Located within the first wall portion 12, the connecting pipe 32 has a first flow channel 321 and a second flow channel 322. The first flow channel 321 connects the diffuser 33 and the air collecting pipe 31. The converging pipe 34 has a fifth end 341 and a sixth end 342. The flow area of ​​the fifth end 341 is smaller than that of the sixth end 342. The fifth end 341 is connected to the connecting pipe 32, and the sixth end 342 is located within the receiving space 11. The second flow channel 322 is connected to the receiving space 11 through the converging pipe 34. The inner wall surface 333 of the diffuser intersects with the first longitudinal section to form two inclined first intersection lines 334. The distance between the two first intersection lines 334 gradually increases along the direction from the first end 331 to the second end 332. The angle between the first intersection line 334 and the centerline 335 of the diffuser is 8 degrees to 15 degrees. The centerline 335 of the diffuser is located within the first longitudinal section. The inner wall surface 343 of the tapered tube intersects with the second longitudinal section to form two inclined second intersection lines 344. The distance between the two second intersection lines 344 gradually increases in the direction from the fifth end 341 to the sixth end 342. The angle between the second intersection line 344 and the center line 345 of the tapered tube is 20 degrees to 30 degrees. The center line 345 of the tapered tube is located within the second longitudinal section.

[0113] In such an energy storage device 10, by setting the flow area of ​​the first end 331 to be smaller than that of the second end 332, and the first flow channel 321 connecting the diffuser 33 and the air collecting pipe 31, when the air collecting pipe 31 blows air into the diffuser 33 through the first flow channel 321, the airflow in the diffuser 33 slows down as the flow area of ​​the diffuser 33 gradually increases, so as to form a negative pressure zone at the first end 331 of the diffuser 33. The negative pressure zone draws the gas in the containment space 11 out of the cabinet 1 through the second flow channel 322. On the one hand, it reduces the risk of fire and explosion due to the high concentration of combustible gas in the containment space 11, and on the other hand, it discharges the high temperature gas in the containment space 11, reduces the temperature of the energy storage device 10, and extends the service life of the energy storage device 10. Furthermore, this energy storage device 10 can simultaneously reduce the space occupied by the exhaust component 3 in the housing 11 and reduce the volume of the exhaust component 3 located outside the cabinet 1. This is beneficial for accommodating more battery cells 2 in the housing 11 and reducing the volume occupied by the energy storage device 10, thereby improving the volumetric energy density of the energy storage device 10. By setting the tapered tube 34, the airflow at the sixth end 342 can be concentrated, which is beneficial for exhausting the gas in the housing 11 out of the cabinet 1 and improving the exhaust effect of the cabinet 1.

[0114] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0115] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An energy storage device, characterized in that, include: A cabinet having a storage space, the cabinet including a first wall portion; A single battery cell is housed within the aforementioned housing space; An exhaust assembly is disposed on the first wall portion. The exhaust assembly includes a collecting duct, a connecting duct, and a diffuser. The diffuser has a first end and a second end opposite each other in its extending direction. The flow area of ​​the first end is smaller than that of the second end. The connecting duct is connected to the first end, and the second end is located outside the cabinet. The collecting duct is connected to the connecting duct. The connecting duct has a first flow channel and a second flow channel. The first flow channel connects the diffuser and the collecting duct, and the second flow channel connects the diffuser and the accommodating space.

2. The energy storage device as described in claim 1, characterized in that, Along the extension direction of the connecting pipe, the connecting pipe has a third end and a fourth end opposite to each other. The third end is closer to the second end than the fourth end. The second flow channel passes through the third end and the fourth end. The third end is provided with an air outlet, which connects the first flow channel and the diffuser.

3. The energy storage device as described in claim 2, characterized in that, The third end is provided with a plurality of air outlets that communicate with the first flow channel, and the plurality of air outlets are arranged at intervals along the circumference of the second flow channel.

4. The energy storage device as described in claim 3, characterized in that, The first flow channel is arranged around the second flow channel.

5. The energy storage device as described in claim 2, characterized in that, The minimum flow area of ​​the air outlet is 10mm²-30mm².

6. The energy storage device as described in any one of claims 1-5, characterized in that, The inner wall of the diffuser intersects with the first longitudinal section to form two inclined first intersection lines. The distance between the two first intersection lines gradually increases in the direction from the first end to the second end. The angle between the first intersection line and the center line of the diffuser is 8 degrees to 15 degrees. The center line of the diffuser is located within the first longitudinal section.

7. The energy storage device as described in any one of claims 1-5, characterized in that, The energy storage device further includes a converging tube having a fifth end and a sixth end. The flow area of ​​the fifth end is smaller than that of the sixth end. The fifth end is connected to the end of the second flow channel away from the converging tube, and the sixth end is connected to the accommodating space.

8. The energy storage device as described in claim 7, characterized in that, The inner wall of the tapered tube intersects with the second longitudinal section to form two inclined second intersection lines. The distance between the two second intersection lines gradually increases along the direction from the fifth end to the sixth end. The angle between the second intersection line and the center line of the tapered tube is 20 degrees to 30 degrees. The center line of the tapered tube is located within the second longitudinal section.

9. The energy storage device as described in claim 7, characterized in that, The inner wall surface of the tapered tube is provided with a coating, and the coefficient of dynamic friction of the coating is greater than the coefficient of dynamic friction of the inner wall surface of the tapered tube.

10. The energy storage device as described in any one of claims 1-5, characterized in that, A flow-rectifying grid is provided inside the diffuser, and the flow-rectifying grid is spaced apart from the connecting pipe.

11. The energy storage device as described in claim 10, characterized in that, The rectifier grille is provided with multiple rectifier channels, each having a seventh end and an eighth end. The seventh end is closer to the connecting pipe than the eighth end, and the flow area of ​​the seventh end is smaller than that of the eighth end.

12. An energy storage system, characterized in that, include: The energy storage device as described in any one of claims 1-11; An air supply device is connected to the air collection pipe and supplies compressed air to the air collection pipe.

13. The energy storage system as described in claim 12, characterized in that, The air supply device has an air inlet, and the air inlet is equipped with a filter screen.

14. The energy storage system as described in claim 12, characterized in that, The cabinet is equipped with a first detection unit, which is configured to detect the concentration of at least one combustible gas in the cabinet. The gas supply device communicates with the first detection unit and is used to adjust the delivery flow rate of the compressed air according to the concentration of the combustible gas.

15. A charging network, characterized in that, include: Charging stations; The energy storage device as described in any one of claims 1-11 is used to provide electrical energy to the charging pile.

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