Energy storage device, energy storage system and charging network

Abstract

The application relates to the technical field of energy storage, in particular to an energy storage device, an energy storage system and a charging network. The energy storage device comprises a box body, a partition plate, a battery device and a drainage assembly. The partition plate is arranged in the box body, the box body has a first containing space, the first containing space contains the battery device, the drainage assembly is arranged on the partition plate and below the partition plate along the gravity direction, the drainage assembly comprises a first floor drain and a second floor drain, the second floor drain is located at a position lower than the first floor drain along the gravity direction; a buffer space is formed between the first floor drain and the second floor drain along the gravity direction, the first floor drain is connected with the first containing space and the buffer space, the second floor drain is connected with the buffer space and an external environment, and the opening pressure of the first floor drain is lower than that of the second floor drain. Through the application, the compatibility of the drainage function and the protection level can be realized, and the risk of the secondary volatilization of the condensed water flowing back into the box body is reduced.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to energy storage devices, energy storage systems and charging networks. Background Technology

[0002] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0003] In the field of energy storage, batteries can be installed in enclosures or directly on the user side. In energy storage applications, the drainage of condensate or coolant within the enclosure needs to be managed. Drainage systems with floor drains are typically used for this purpose, but these systems often suffer from a trade-off between ensuring both proper sealing and adequate drainage capacity. Therefore, finding a balance between the sealing performance and drainage capacity of drainage systems in energy storage devices is one of the key research topics in the industry. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides an energy storage device, an energy storage system, and a charging network.

[0005] This application is achieved through the following technical solution.

[0006] A first aspect of this application provides an energy storage device. In some embodiments, the energy storage device includes a housing, a partition plate, a battery device, and a drainage assembly. The partition plate is disposed in the housing, and the housing has a first accommodating space that houses the battery device. The drainage assembly is disposed on the partition plate and located below the partition plate along the direction of gravity. The drainage assembly includes a first floor drain and a second floor drain. The second floor drain is located at a position lower than the first floor drain along the direction of gravity. A buffer space is formed between the first floor drain and the second floor drain along the direction of gravity. The first floor drain is configured to connect the first accommodating space and the buffer space, and the second floor drain is configured to connect the buffer space and the external environment. The opening pressure of the first floor drain is lower than the opening pressure of the second floor drain.

[0007] In the technical solution of this application embodiment, since a first floor drain and a second floor drain are set up with upper and lower separation, and the opening pressure of the first floor drain is lower than that of the second floor drain, the drainage component can form a pressure gradient. A small amount of condensate can be discharged quickly and timely by the first floor drain with lower pressure and stored in the buffer space to prevent accumulation in the first containment space. External moisture cannot enter the box from the second floor drain with higher opening pressure, which can effectively maintain the sealing of the box and facilitate the one-way discharge of condensate, reducing the risk of secondary evaporation and backflow of condensate. The drainage capacity and sealing performance of the energy storage device are taken into account.

[0008] In some embodiments, the projection is directed along the direction of gravity onto a projection plane perpendicular to the direction of gravity, and the projection of the first drain overlaps at least partially with the projection of the second drain.

[0009] In the technical solution of this application embodiment, since the projection of the first floor drain and the projection of the second floor drain at least partially overlap, the liquid flowing out from the first floor drain can fall into the effective collection range of the second floor drain as much as possible under the action of gravity, quickly and completely transferring the liquid from the upper floor drain to the lower floor drain, reducing the risk of secondary evaporation and backflow of condensate; when the liquid volume reaches a pressure sufficient to push open the second floor drain, the liquid can be quickly discharged from the box.

[0010] In some embodiments, the drainage assembly includes a sleeve defining the buffer space; the first floor drain and the second floor drain are detachably connected to the sleeve along the direction of gravity.

[0011] In the technical solution of this application embodiment, the liquid can be quickly transferred to the second drain through the sleeve. Furthermore, the sleeve isolates the drainage path from the first receiving space, reducing the impact of the liquid on the battery device. Additionally, the first and second drains are detachably connected to the sleeve, forming a modular structure for the drainage assembly. This facilitates disassembly and assembly during installation and maintenance, improving installation and maintenance efficiency.

[0012] In some embodiments, the sleeve is provided with a first flange and a second flange, the first floor drain is bolted to the first flange, and the second floor drain is bolted to the second flange.

[0013] In the technical solution of this application embodiment, since the first floor drain and the second floor drain are connected to the sleeve flange, the connection between the floor drain and the sleeve is simple and reliable, and the flange connection has high stability and good airtightness, which is suitable for the working environment of the energy storage device.

[0014] In some embodiments, the drainage assembly includes a seal disposed between the first floor drain and the inner wall of the sleeve, and the seal extends circumferentially along the first floor drain; and / or, the seal is disposed between the second floor drain and the inner wall of the sleeve, and the seal extends circumferentially along the second floor drain.

[0015] In the technical solution of this application embodiment, since the sealing element is disposed between the floor drain and the inner wall of the sleeve and extends circumferentially, a circumferentially continuous sealing barrier is formed between the floor drain and the inner wall of the sleeve, filling the circumferential gap of the floor drain, so that external moisture cannot seep in along the flange gap.

[0016] In some embodiments, the housing includes a bottom wall; along the direction of gravity, one end of the sleeve is connected to the partition plate, and the other end is connected to the bottom wall, and the second floor drain is located inside the sleeve.

[0017] In the technical solution of this application embodiment, since the lower end of the sleeve is directly connected to the bottom wall of the box, the sleeve is located in the second space. The second floor drain can be installed inside the lower end of the sleeve to connect the inside of the box with the external environment. The liquid discharged from the second floor drain is directly discharged to the outside of the box to prevent corrosion of the box structure.

[0018] In some embodiments, the partition includes a drainage section located below other positions of the partition along the direction of gravity, and the drainage assembly is disposed on the drainage section.

[0019] In the technical solution of this application embodiment, the drainage section is recessed downward relative to other parts of the partition plate, forming a natural gravity slope, which facilitates the automatic collection of liquid into the drainage section and drainage components under the action of gravity, which is beneficial to liquid collection and diversion, and shortens the residence time of liquid in the first receiving space, reducing liquid evaporation.

[0020] In some embodiments, the opening pressure of the first floor drain is in the range of 0.05-0.15 MPa, and / or the opening pressure of the second floor drain is in the range of 0.3-0.5 MPa.

[0021] In the technical solution of this application embodiment, the first floor drain has a low opening pressure, which allows it to reliably open when drainage is needed, and can discharge a thin film of condensate. The second floor drain has a high opening pressure, which can meet the IP67 airtightness requirement.

[0022] In some embodiments, the enclosure has a main body and a door, with a sealing structure between the main body and the door, and the partition plate divides the interior of the enclosure into a first accommodating space and a second accommodating space, with the drainage assembly located in the second accommodating space.

[0023] In the technical solution of this application embodiment, the second accommodating space serves as a channel between the first accommodating space and the external environment, and can also accommodate the drainage components, reducing the risk of leakage at the sealing interface between the drainage components and the external environment, and further improving the sealing performance of the box in conjunction with the sealing structure.

[0024] The second part of the embodiments of this application provides an energy storage system. In some embodiments, the energy storage system includes a power conversion device and the energy storage device described in the first part of the embodiments of this application. The power conversion device is used to electrically connect the power generation device and the energy storage device.

[0025] In the technical solutions of this application embodiment, since the energy storage system includes an energy storage device, it also has all the technical effects achieved by the energy storage device.

[0026] The third part of the embodiments of this application provides a charging network. In some embodiments, the charging network includes charging piles and the energy storage device described in the first part of the embodiments of this application or the energy storage system described in the second part of the embodiments of this application. The energy storage device is used to provide electrical energy to the charging piles.

[0027] In the technical solutions of this application embodiment, since the charging network includes an energy storage system or an energy storage device, it also has all the technical effects achieved by the energy storage device or energy storage system.

[0028] The beneficial effects of this disclosure include: by providing a drainage component with a pressure gradient in the energy storage device, a small amount of condensate can be discharged quickly and promptly by the first floor drain with lower pressure, preventing accumulation in the first containment space; while external moisture cannot enter the box through the second floor drain with higher opening pressure, effectively maintaining the sealing of the box, which is conducive to the one-way discharge of condensate and reduces the risk of secondary evaporation and backflow of condensate; thus balancing the drainage capacity and sealing performance of the energy storage device.

[0029] 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

[0030] 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 charging network structure in some embodiments of this application; Figure 2 This is a schematic diagram of the energy storage system in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of the energy storage device in some embodiments of this application; Figure 4 This is a schematic diagram showing the installation location of the drainage components in some embodiments of this application; Figure 5 for Figure 4 A magnified view of a portion of point A in the middle.

[0031] 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 Housing; 211 Bottom wall; 300 Charging pile; 400 Energy storage converter; 220 Partition plate; 221 Drainage section; 230 Drainage assembly; 10 First floor drain; 20 Second floor drain; 30 Sleeve; 31 First flange; 32 Second flange; 40 Sealing element. Detailed Implementation

[0032] 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.

[0033] 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 belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in this document and the foregoing description of the accompanying drawings are intended to cover non-exclusive inclusion.

[0034] 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.

[0035] 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.

[0036] 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 are in an "or" relationship.

[0037] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., 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 do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0038] 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0039] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0040] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "parallel" and "perpendicular" are both allowed to have a certain degree of tolerance and / or error, including cases of being approximately parallel and approximately perpendicular.

[0041] The following is a detailed description of this application.

[0042] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0043] In energy storage applications, it is necessary to manage the discharge of condensate or coolant inside the storage tank. Drainage systems with floor drains are typically used for this purpose, but these systems often suffer from a trade-off between ensuring adequate sealing and sufficient drainage capacity. Therefore, finding a balance between the sealing performance and drainage capacity of the energy storage device's drainage system is a key research topic in the industry.

[0044] Through research and design, multiple floor drains with different opening pressures are combined to form a drainage component with a drainage pressure gradient. The upper floor drain is equipped with a sealing structure with a lower opening pressure, enabling it to respond to the discharge needs of small amounts of liquid; the lower floor drain is equipped with a sealing structure with a higher opening pressure, used to handle larger accumulations of liquid. This hierarchical control mechanism ensures that small amounts of liquid can be discharged promptly, while effectively handling situations where liquid is discharged in large quantities. At the same time, the double-layer sealing structure design enhances the energy storage device's ability to prevent external moisture backflow and its airtightness, preventing external moisture from entering the energy storage device's casing.

[0045] Based on this design concept, this application designs an energy storage device, which includes a housing, a partition plate, a battery device, and a drainage component. The partition plate is disposed in the housing, which has a first accommodating space for housing the battery device. The drainage component is disposed on the partition plate and located below the partition plate along the direction of gravity. The drainage component includes a first drain and a second drain, with the second drain located below the first drain along the direction of gravity. A buffer space is formed between the first drain and the second drain along the direction of gravity. The first drain is configured to connect the first accommodating space and the buffer space, and the second drain is configured to connect the buffer space and the external environment. The opening pressure of the first drain is lower than that of the second drain.

[0046] Because the system is equipped with a first and second floor drain separated by an upper and lower section, and the opening pressure of the first floor drain is lower than that of the second floor drain, the drainage components can form a pressure gradient. A small amount of condensate can be discharged quickly and promptly by the first floor drain with lower pressure and stored in the buffer space to avoid accumulation in the first storage space. Meanwhile, external moisture cannot enter the box from the second floor drain with higher opening pressure, which can effectively maintain the sealing of the box and facilitate the one-way discharge of condensate, thus balancing the drainage capacity and sealing of the energy storage device.

[0047] The battery device disclosed in this application can be applied to energy storage devices such as energy storage containers or energy storage cabinets.

[0048] The battery device 100 will be described below with reference to the accompanying drawings.

[0049] Please refer to Figure 1 and Figure 3 , Figure 1 This is a schematic diagram of the structure of a charging network 1000 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of an energy storage device 200 provided in some embodiments of this application. Embodiments of this application provide a charging network 1000, which includes a charging pile 300 for charging electrical equipment. The charging network 1000 may also include an energy storage device 200, which is electrically connected to the charging pile 300 and provides power to the charging pile 300.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of an energy storage system 2000 provided in some embodiments of this application. Embodiments of this application provide an energy storage system 2000. The energy storage system 2000 includes an energy storage converter 400, which is electrically connected to a generator 3000 to convert the electrical power provided by the generator 3000. The energy storage system 2000 may also include an energy storage device 200, which is electrically connected to the energy storage converter 400. The energy storage converter 400 converts the electrical energy provided by the generator 3000 and stores it in the energy storage device 200.

[0055] 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 equipment can be solar panels, hydroelectric power generation equipment, thermal power generation equipment, etc. This application does not limit the specific type of power generation equipment.

[0056] As an example, such as Figure 2As 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.

[0057] Please refer to Figure 3 The energy storage device 200 includes a housing 210, and a battery device 100 is installed inside the housing 210.

[0058] As an example, the energy storage device 200 can be an energy storage container, an energy storage cabinet, etc.

[0059] 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.

[0060] Below, refer to Figures 4 to 5 Some embodiments of this application will be described in detail.

[0061] Figure 4 This is a schematic diagram showing the installation location of the drainage components in some embodiments of this application; Figure 5 This is a schematic diagram of the structure of the drainage component in some embodiments of this application.

[0062] In some embodiments of this application, for the purpose of facilitating understanding of the embodiments of this application, in Figure 4 to Figure 5 In the illustrated embodiment, the direction of arrow Z is taken as the direction of gravity. Sometimes, the direction in which arrow Z points along the direction of gravity is referred to as "downward," and its opposite direction as "upward."

[0063] The first aspect of this application provides an energy storage device 200. In the embodiments of this application, the energy storage device 200 includes a housing 210, a partition plate 220, a battery device 100, and a drainage component 230. The partition plate 220 is disposed in the housing 210, and the housing 210 has a first accommodating space. The first accommodating space accommodates the battery device 100. The drainage component 230 is disposed on the partition plate 220 and located below the partition plate 220 along the gravity direction (Z). The drainage component 230 includes a first drain 10 and a second drain 20. The second drain 20 is located at a position lower than the first drain 10 along the gravity direction (Z). A buffer space is formed between the first drain 10 and the second drain 20 along the gravity direction (Z). The first drain 10 is configured to connect the first accommodating space and the buffer space, and the second drain 20 is configured to connect the buffer space and the external environment. The opening pressure of the first drain 10 is lower than the opening pressure of the second drain 20.

[0064] For example, the enclosure 210 typically includes a top wall, side walls, and a bottom wall 211. The bottom wall 211 may be in contact with the ground or foundation.

[0065] Optionally, the enclosure 210 may be equipped with a maintenance door, which may be located on any side wall or top wall, or the side wall or bottom wall 211 may be openable to allow personnel to enter and exit.

[0066] For example, a partition 220 is disposed inside the housing 210 for carrying batteries or other components. The partition 220 divides the interior of the housing 210 into two spaces: an upper first accommodating space and a lower second accommodating space. This application does not limit the shape of the first and second accommodating spaces. Generally, the first accommodating space houses the battery device 100, which has a larger capacity than the second accommodating space.

[0067] It is understood that the partition 220 is a plate-like structure. Optionally, a bottom frame is provided inside the box 210, and the partition 220 can be part of the bottom frame, such as as the top cover of the bottom frame, or the partition 220 can be an independently installed load-bearing plate connected to the side wall of the box 210.

[0068] Optionally, the partition 220 is typically made of a metallic material, such as steel plate, aluminum alloy plate, or composite material, to provide sufficient structural strength. This application does not limit the shape or thickness of the partition 220.

[0069] It is understood that the battery device 100 is an energy storage unit in the energy storage device 200, and can be a cell, battery, or battery pack. This application does not limit the capacity or number of battery devices 100.

[0070] Optionally, the battery device 100 can be placed in a container, which is placed on a partition plate 220. The container can be one of a frame, cabinet, or cabin.

[0071] Understandably, the drainage assembly 230 is used to drain the liquid accumulated inside the housing 210 out of the housing 210, and the liquid may be condensate or leaked coolant.

[0072] Optionally, the drainage component 230 can be pre-installed on the partition plate 220 as a whole, or it can be installed separately.

[0073] For example, such as Figure 4 , Figure 5 As shown, the drainage assembly 230 includes a first floor drain 10 and a second floor drain 20, and the drainage assembly 230 connects the first receiving space, the second receiving space and the external environment.

[0074] Understandably, the liquid gathers in the first containment space, flows into the first drain 10 and into the second containment space, and then flows out of the box 210 after passing through the second drain 20.

[0075] Understandably, the first drain 10 and the second drain 20 are normally closed, opening only when the liquid pressure (hydrostatic pressure) reaches the required level. Once open, the drains connect the two spaces; for example, when the first drain 10 is open, the first and second containment spaces are connected; when the first drain 10 is closed, they are isolated. Similarly, the second drain 20 controls the connection between the second containment space and the external environment.

[0076] It should be noted that the opening pressure refers to the minimum liquid pressure required for the floor drain to change from a closed state to an open state. The opening pressure may vary depending on the type of seal on the floor drain. The internal sealing structure of the floor drain can use springs, magnetic structures, etc., and this application does not limit this aspect.

[0077] Optionally, the opening pressure can be a fixed value or it can be adjustable; this application embodiment does not limit this.

[0078] It is understandable that the first floor drain 10 and the second floor drain 20 include a filter structure (such as a grate) and a discharge port, internal sealing structure, etc.

[0079] Optionally, the material of the first drain 10 can be one of the following: plastic, stainless steel, copper alloy, or polymer composite material.

[0080] Optionally, the number of first drains 10 can be one or more, and the number of second drains 20 can be one or more.

[0081] Optionally, in embodiments not shown, the drainage assembly 230 may further include a third floor drain, which has a different installation height from the first floor drain 10 and the second floor drain 20.

[0082] Optionally, in embodiments not shown, the drainage assembly 230 may further include a fourth floor drain and a fifth floor drain arranged along the direction of gravity (Z). The installation height of the fourth and fifth floor drains differs from that of the other floor drains.

[0083] For example, a buffer space is formed between the first drain 10 and the second drain 20 along the direction of gravity (Z). This application does not limit the size or shape of the buffer space. The opening pressure of the second drain 20 is higher, so after the liquid is discharged from the first containment space through the first drain 10, it can accumulate in the buffer space and wait to be discharged from the box after reaching the opening pressure of the second drain 20.

[0084] It is understandable that cache space can be the internal space of a box or a container within a box.

[0085] Optionally, the drainage assembly 230 also includes a sleeve 30 disposed in the second receiving space, having a buffer space inside, to collect the liquid discharged from the first floor drain 10 and direct it into the second floor drain 20.

[0086] Optionally, at least a portion of the drainage assembly 230 passes through or is fixed to the partition plate 220, and the inlet of the first floor drain 10 is located on or flush with the upper surface of the partition plate 220 in order to collect the liquid accumulated on the partition plate 220.

[0087] In the technical solution of this application embodiment, since a first floor drain 10 and a second floor drain 20 are set up with upper and lower separation, and the opening pressure of the first floor drain 10 is lower than that of the second floor drain 20, the drainage component 230 can form a pressure gradient. A small amount of condensate can be discharged in time and quickly by the first floor drain 10 with lower pressure, avoiding accumulation in the first containment space. External moisture cannot enter the box 210 from the second floor drain 20 with higher opening pressure, which can effectively maintain the sealing of the box 210 and facilitate the one-way discharge of condensate, taking into account both the drainage capacity and sealing of the energy storage device 200.

[0088] In the embodiments of this application, the projection of the first drain 10 is projected along the gravity direction (Z) onto a projection plane perpendicular to the gravity direction (Z), and at least a portion of the projection of the second drain 20 overlaps with the projection of the first drain 10.

[0089] It is understandable that the vertical projections of the first drain 10 and the second drain 20 in the direction of gravity (Z) overlap, meaning that when viewed from above, at least a portion of the first drain 10 is directly above the second drain 20. This arrangement shortens the liquid flow path and reduces the risk of liquid residue remaining in the buffer space without being drained.

[0090] For example, the projection of the first drain 10 falls within the projection area of ​​the second drain 20. The projection area of ​​the first drain 10 is smaller than the projection area of ​​the second drain 20.

[0091] For example, the projection of the second drain 20 falls within the projection range of the first drain 10. The projection area of ​​the first drain 10 is larger than the projection area of ​​the second drain 20.

[0092] For example, such as Figure 5 As shown, the projection of the first drain 10 coincides with the projection range of the second drain 20. All liquid flowing out of the first drain 10 can fall vertically into the collection range of the second drain 20.

[0093] Optionally, the projected shapes of the first drain 10 and the second drain 20 can be circular, elliptical, quadrilateral or other polygonal.

[0094] Optionally, the shape of the first drain 10 and the shape of the second drain 20 may be the same or different.

[0095] For example, the first drain 10 and the second drain 20 have the same projected shape, and both are circular, with the line connecting their centers parallel to the direction of gravity (Z). It can be understood that the first drain 10 and the second drain 20 are arranged coaxially along the direction of gravity (Z).

[0096] Understandably, the liquid collected by the first drain 10 accumulates above the second drain 20. When the pressure reaches the required level, the second drain 20 opens and drains the liquid outside the housing 210.

[0097] It is understandable that the first drain 10 and the second drain 20 are unidirectional. When opened in the forward direction, the accumulated water compresses the spring inside the first drain 10 or the second drain 20 due to gravity, and the water flows out from the drain position along the direction of gravity. However, the drain is sealed when it is not opened, and water vapor cannot pass through the drain in the reverse direction (i.e., against the direction of gravity) when it evaporates.

[0098] In the technical solution of this application embodiment, since the projection of the first floor drain 10 and the projection of the second floor drain 20 at least partially overlap, the liquid flowing out from the first floor drain 10 can fall into the effective collection range of the second floor drain 20 as much as possible under the action of gravity, quickly and completely transferring the liquid from the upper floor drain to the lower floor drain, reducing the risk of secondary evaporation and backflow of condensate; when the liquid volume reaches a pressure sufficient to push open the second floor drain 20, the liquid can be quickly discharged from the box 210.

[0099] In an embodiment of this application, the drainage assembly 230 includes a sleeve 30 that defines a buffer space; along the direction of gravity (Z), the first floor drain 10 and the second floor drain 20 are detachably connected to the sleeve 30.

[0100] Understandably, the sleeve 30 is a hollow cylindrical or tubular structure. The inner wall of the sleeve 30 defines a buffer space for temporarily storing liquid flowing in from the first drain 10. Furthermore, the sleeve 30 can provide a mounting base for the first drain 10 and the second drain 20.

[0101] Alternatively, the sleeve 30 can be cylindrical or funnel-shaped.

[0102] Optionally, the cross-sectional shape of the sleeve 30 can be circular, elliptical, rectangular or other regular shapes. This embodiment uses a circular shape as an example for illustration.

[0103] For example, such as Figure 4 , Figure 5 As shown, the sleeve 30 can be a straight cylinder, vertically installed in the second receiving space along the direction of gravity (Z).

[0104] Optionally, one end of the sleeve 30 can extend into the first receiving space, and the other end can extend out of the housing 210.

[0105] Optionally, through holes can be provided in the partition plate 220 and the bottom wall 211 of the box 210, and the sleeve 30 is inserted into the through hole.

[0106] Optionally, the first drain 10 and the second drain 20 can be installed in the sleeve 30.

[0107] Alternatively, the sleeve 30 can be made of materials such as stainless steel, engineering plastics, or aluminum alloy.

[0108] Optionally, the inner and outer walls of the sleeve 30 may be provided with anti-corrosion coatings or plating.

[0109] Optionally, multiple guide grooves or guide ribs can be provided on the inner wall of the sleeve 30 to guide the liquid to flow along a preset path.

[0110] Optionally, the drain and sleeve 30 can be connected by threaded connection, snap-fit ​​connection, quick-release coupling, etc., for easy maintenance or replacement.

[0111] It is understandable that there is a certain gap between the first drain 10 and the second drain 20 along the direction of gravity (Z). A temporary storage space is formed between the two inside the sleeve 30. Since the opening pressure of the second drain 20 is higher than that of the first drain 10, some water will be retained in the temporary storage space. After the water reaches the opening pressure of the second drain 20, it will be discharged from the box 210.

[0112] In the technical solution of this application embodiment, the liquid can be quickly transferred to the second drain 20 through the sleeve 30. In addition, the sleeve 30 isolates the drainage path from the first receiving space, which can reduce the impact of the liquid on the battery device 100. Furthermore, the first drain 10 and the second drain 20 are detachably connected to the sleeve 30, so that the drainage assembly 230 forms a modular structure, which is beneficial for disassembly and assembly during installation and maintenance, and improves installation and maintenance efficiency.

[0113] In the embodiments of this application, a first flange 31 and a second flange 32 are provided inside the sleeve 30, the first floor drain 10 is bolted to the first flange 31, and the second floor drain 20 is bolted to the second flange 32.

[0114] Optionally, the first flange 31 and the second flange 32 are annular flanges that protrude radially inward or outward from the sleeve 30, providing a mounting support surface and a sealing mating surface for the floor drain.

[0115] Understandably, the first flange 31 and the second flange 32 have multiple bolt holes or through holes for inserting bolts. The bolt holes are evenly distributed circumferentially.

[0116] For example, the first flange 31 and the second flange 32 are both flanges on the inner side of the sleeve 30, that is, flanges that protrude radially inward from the inner wall of the sleeve 30.

[0117] For example, such as Figure 5 As shown, the first flange 31 is located on the upper part of the sleeve 30, close to the partition plate 220, while the second flange 32 is located on the lower part of the sleeve 30, closer to the bottom wall 211 of the housing 210.

[0118] Optionally, the upper or lower surface of the first flange 31 is fitted against the flange face of the floor drain; of course, a gasket is placed between the two to improve the sealing effect. The second flange 32 is similar to the first flange 31.

[0119] For example, the first floor drain 10 is attached to the upper surface of the first flange 31 and connected by bolts. The second floor drain 20 is attached to the lower surface of the second flange 32 and connected by bolts, which facilitates disassembly and assembly by tightening the bolts.

[0120] In the technical solution of this application embodiment, since the first floor drain 10 and the second floor drain 20 are connected to the sleeve 30 by flange, the connection between the floor drain and the sleeve 30 is simple and reliable, and the flange connection has high stability and good airtightness, which is suitable for the working environment of the energy storage device 200.

[0121] In embodiments of this application, the drainage assembly 230 includes a seal 40, which is disposed between the first floor drain 10 and the inner wall of the sleeve 30 and extends circumferentially along the first floor drain 10, and / or, the seal 40 is disposed between the second floor drain 20 and the inner wall of the sleeve 30 and extends circumferentially along the second floor drain 20.

[0122] Understandably, the seal 40 is used to fill the gap between the drain and the inner wall (or flange face) of the sleeve 30 to prevent liquid or gas leakage.

[0123] Alternatively, the seal 40 may be a sealing ring, a sealing gasket, a sealing adhesive layer, or a sealing sleeve.

[0124] Optionally, the sealant layer can be a cured sealant layer formed by silicone sealant, polyurethane sealant, or other sealants.

[0125] Understandably, the shape of the sealant layer is related to the shape of the gap between the drain and the inner wall of the sleeve 30, and can be annular, such as a circular ring, an elliptical ring, etc.

[0126] For example, such as Figure 5 As shown, the sealing element 40 is radially disposed between the first floor drain 10 and the inner wall of the sleeve 30 along the sleeve 30.

[0127] In some embodiments not shown, the seal 40 may be radially disposed between the second drain 20 and the inner wall of the sleeve 30 along the sleeve 30.

[0128] In the technical solution of this application embodiment, since the sealing element 40 is disposed between the floor drain and the inner wall of the sleeve 30 and extends circumferentially, a circumferentially continuous sealing barrier is formed between the floor drain and the inner wall of the sleeve 30, filling the circumferential gap of the floor drain, so that external moisture cannot seep in along the flange gap.

[0129] In the embodiments of this application, the box 210 includes a bottom wall 211; along the direction of gravity (Z), one end of the sleeve 30 is connected to the partition plate 220, and the other end is connected to the bottom wall 211, and the second floor drain 20 is located inside the sleeve 30.

[0130] For example, the bottom wall 211 is the bottom wall panel of the housing 210. Optionally, the bottom wall 211 is in direct contact with the ground or in contact with the ground through a base.

[0131] For example, the bottom wall 211 is provided with an installation hole corresponding to the lower end of the sleeve 30, so that the liquid discharged from the second floor drain 20 can flow directly out of the box 210.

[0132] Optionally, the upper end of the sleeve 30 (i.e. the end where the first floor drain 10 is installed) is connected to the partition plate 220, and the connection method can be welding, bolting, riveting or bonding.

[0133] For example, the upper end of the sleeve 30 is bolted to the partition plate 220. Specifically, the upper end of the sleeve 30 is provided with an outwardly turned flange, which is bolted to the partition plate 220.

[0134] Optionally, the lower end of the sleeve 30 is connected to the bottom wall 211, and the connection method can be welding, bolting, riveting or bonding.

[0135] Optionally, sealing gaskets or sealant can be provided at the connection between the sleeve 30 and the partition plate 220, as well as at the connection between the sleeve 30 and the bottom wall 211, to prevent liquid from seeping out from the gaps at the connection interface.

[0136] In the technical solution of this application embodiment, since the lower end of the sleeve 30 is directly connected to the bottom wall 211 of the box 210, the sleeve 30 is located in the second space. The second floor drain 20 can be installed at the lower end of the sleeve 30 to connect the inside of the box 210 with the external environment. The liquid discharged from the second floor drain 20 is directly discharged to the outside of the box 210 and will not come into contact with other structural components in the second accommodating space, thus preventing corrosion of the structural components of the box 210.

[0137] In an embodiment of this application, the partition plate 220 includes a drainage section 221. Along the direction of gravity (Z), the drainage section 221 is lower than other positions of the partition plate 220, and the drainage assembly 230 is disposed on the drainage section 221.

[0138] Understandably, the drainage section 221 is a local low-lying area on the partition plate 220, which may be the lowest point of the entire partition plate 220, guiding the accumulated liquid to quickly converge to the drainage component 230.

[0139] Alternatively, the drainage portion 221 may be a partial recess, such as a pit or groove.

[0140] Optionally, when viewed along the direction of gravity (Z), the drainage section 221 can be circular, elliptical, square, or other regular shapes, or it can be an irregular shape. This application embodiment does not limit this, as long as it can collect liquid.

[0141] For example, the area of ​​the drainage section 221 is larger than the inlet area of ​​the first floor drain 10, which is conducive to the smooth flow of liquid into the drainage assembly 230.

[0142] In the technical solution of this application embodiment, the drainage section 221 is recessed downward relative to other parts of the partition plate 220, forming a natural gravity slope, which facilitates the liquid to automatically gather in the drainage section 221 and drainage component 230 under the action of gravity, which is beneficial to liquid collection and diversion, and shortens the residence time of the liquid in the first receiving space, reducing liquid evaporation.

[0143] In the embodiments of this application, the opening pressure of the first floor drain 10 is in the range of 0.05-0.15 MPa, and / or the opening pressure of the second floor drain 20 is in the range of 0.3-0.5 MPa.

[0144] Optionally, the opening pressure of the first floor drain 10 can be any one of the following values, or any value between any two of these values: 0.05MPa, 0.06MPa, 0.07MPa, 0.08MPa, 0.09MPa, 0.10MPa, 0.11MPa, 0.12MPa, 0.13MPa, 0.14MPa, 0.15MPa.

[0145] Optionally, the opening pressure of the second drain 20 can be any one of the following values, or any value between any two of these values: 0.30MPa, 0.31MPa, 0.32MPa, 0.33MPa, 0.34MPa, 0.35MPa, 0.36MPa, 0.37MPa, 0.38MPa, 0.39MPa, 0.40MPa, 0.41MPa, 0.42MPa, 0.43MPa, 0.44MPa, 0.45MPa, 0.46MPa, 0.47MPa, 0.48MPa, 0.49MPa, 0.50MPa.

[0146] In the technical solution of this application embodiment, the first floor drain 10 has a low opening pressure, which allows it to open reliably when drainage is needed, and can discharge a thin condensate film. The second floor drain 20 has a high opening pressure, which can meet the IP67 airtightness requirement.

[0147] In the embodiments of this application, the box 210 has a box body and a door, and there is a sealing structure between the box body and the door. The partition plate 220 is disposed in the box 210, dividing the box 210 into a first accommodating space and a second accommodating space. The drainage component 230 is located in the second accommodating space.

[0148] The embodiments of this application do not limit the size and shape of the first and second accommodating spaces.

[0149] It is understandable that the first containment space is located above the second containment space.

[0150] For example, the second receiving space is the space below the partition. The drainage assembly 230 is located within the second receiving space, i.e., the buffer space is located within the second receiving space.

[0151] Understandably, the main body of the container has an opening on one side. The door is rotatably connected to the main body of the container and is used to open or close the opening. The gap between the door and the main body of the container is sealed by a sealing structure.

[0152] Alternatively, the door can be rotatably connected to the box body via hinges, hinge plates, or the like.

[0153] Optionally, the sealing structure may include a sealing strip that is connected to the body of the box and surrounds the opening or is connected to the door.

[0154] Optionally, the sealing strip may be, but is not limited to, a rubber strip, plastic strip, silicone strip, or other structure that is easily deformed under stress.

[0155] In the technical solution of this application embodiment, the second accommodating space serves as a channel between the first accommodating space and the external environment, and can also accommodate the drainage components, reducing the risk of leakage at the sealing interface between the drainage components 230 and the external environment, and further improving the sealing performance of the box in conjunction with the sealing structure.

[0156] The second part of the embodiments of this application provides an energy storage system 2000. In the embodiments of this application, the energy storage system 2000 includes a power conversion device and an energy storage device 200 of the first part of the embodiments of this application. The power conversion device is used to electrically connect the power generation device 3000 and the energy storage device 200.

[0157] In the technical solution of the embodiments of this application, since the energy storage system 2000 includes the energy storage device 200, it also has all the technical effects achieved by the energy storage device 200.

[0158] The third part of the embodiments of this application provides a charging network 1000. In the embodiments of this application, the charging network 1000 includes a charging pile 300 and an energy storage device 200 of the first part of the embodiments of this application or an energy storage system 2000 of the second part of the embodiments of this application. The energy storage device 200 is used to provide electrical energy to the charging pile 300.

[0159] In the technical solutions of this application embodiment, since the charging network 1000 includes an energy storage system 2000 or an energy storage device 200, it also has all the technical effects achieved by the energy storage device 200 or the energy storage system 2000.

[0160] The specific solutions of the embodiments of this application are described below with reference to the accompanying drawings.

[0161] In the field of liquid discharge, especially for scenarios that require phased treatment such as condensate or coolant, traditional single-layer floor drain structures are difficult to meet the needs of timely discharge of small amounts of liquid and centralized treatment of large amounts of liquid.

[0162] This application designs a floor drain device that can be installed in both upper and lower layers, mainly used in battery compartments requiring a high degree of sealing, such as energy storage devices 200 with IP67 or higher requirements. This prevents excessive condensation caused by environmental factors, which could affect safety and lifespan. The energy storage device 200 includes a battery unit 100 (battery box or module) mounted on a partition plate 220, the partition plate 220, a drainage assembly 230, and a housing 210. The battery box or module is the main energy storage device and is directly mounted on the upper surface of the partition plate 220 to save space. The partition plate 220 is the carrier for the battery box or module and other components, and can serve as the top cover of the bottom frame. The partition plate 220 divides the interior of the housing 210 into a first accommodating space and a second accommodating space, with the battery located in the first accommodating space. The drainage assembly 230 is installed at the lowest point of the partition plate 220, which facilitates the flow of liquid on the partition plate 220. When the liquid flows to the drainage assembly 230, it can be quickly discharged into the compartment, avoiding liquid accumulation that could cause insulation failure of the electrical box or module. The drainage assembly 230 is an integrated structure consisting of two floor drains (first floor drain 10 and second floor drain 20), sleeve 30 and flange. The first floor drain 10 is the upper floor drain and the second floor drain 20 is the lower floor drain. The enclosure 210 is a device that covers the electrical box or module. The enclosure 210 can be the enclosure 210 of a container. It meets the airtight requirements and provides a closed space for the electrical box or module. At the same time, the floor drain is covered inside the enclosure.

[0163] Furthermore, the first drain 10 has a low opening pressure, requiring only 10-20g of water to open, allowing for rapid drainage of liquid inside the chamber. The second drain 20 has a higher opening pressure, ensuring it will not open under IP67 (depending on actual requirements) test pressure (2kp), meeting overall airtightness requirements. This drain is normally closed, preventing outside air from entering the chamber when there is no liquid accumulation. The upper and lower drains are connected by a sleeve 30, with a buffer space between them. This provides a space for the lower drain to open and allow liquid to accumulate, while the upper drain closes once no water is discharged, preventing any remaining liquid from evaporating back into the chamber and causing corrosion and condensation issues.

[0164] The sleeve 30 extends along the direction of gravity (Z), with its upper end connected to the partition plate 220 and its lower end connected to the bottom wall 211 of the housing 210, and is in communication with the external environment. The sleeve 30 is disposed within the second accommodating space. Liquid flows from the partition plate 220 through the first floor drain 10 into the sleeve 30, accumulates within the sleeve 30, and is discharged from the housing 210 through the second floor drain 20.

[0165] Furthermore, the buffer space between the floor drains and the area in contact with the accumulated liquid are made of corrosion-resistant materials, such as weather-resistant stainless steel, plastic, or ordinary materials with anti-corrosion coatings; this avoids internal corrosion problems when the accumulated liquid does not reach the pressure required to open the floor drain below.

[0166] Furthermore, the drainage component 230 is installed at the lower part of the partition plate 220 to facilitate the rapid discharge of accumulated liquid; and it is an integral installation form, which can meet the requirements of overall installation and replacement of the floor drain.

[0167] Furthermore, the first floor drain 10 is installed from top to bottom, and the second floor drain 20 is installed from bottom to top. The first floor drain 10 is bolted to the first flange 31 inside the sleeve 30, and the second floor drain 20 is bolted to the second flange 32 inside the sleeve 30. This is to facilitate installation. The lower floor drain has a lower installation interface, and it is inconvenient to go down into the deeper channel to use tools. Also, by installing from bottom to top, there is no need to worry about the flange position being too deep to be sealed with sealant, which could lead to long-term water accumulation or leakage at the sealing interface.

[0168] Furthermore, the distance between the upper and lower floor drains is such that the pressure provided when the drain is full of coolant or condensate is sufficient to open the lower floor drain.

[0169] During operation, when a small amount of condensate or coolant is generated inside the energy storage device 200 (within the first containment space), the liquid pressure reaches the lower opening level of the upper floor drain, causing the upper first floor drain 10 to open and the liquid to be discharged into the temporary storage space between the two floor drains. As the liquid continues to accumulate, when the liquid level reaches a certain height and generates sufficient pressure, the higher opening pressure of the lower floor drain is met, its sealing structure opens, and the accumulated liquid is discharged from the system. This solution, through this hierarchical control mechanism, ensures timely discharge of small amounts of liquid while effectively handling situations where liquid is discharged in large quantities. The double-layer sealing structure design also enhances the system's ability to prevent backflow of external moisture. It is suitable for energy storage scenarios with high IP rating requirements and sensitivity to condensate, offering advantages such as high discharge efficiency, good backflow prevention performance, and strong system reliability.

[0170] Furthermore, this application sets the pressure of the upper floor drain to 0.05-0.15 MPa. This design ensures that drainage is triggered when the amount of condensate inside the device is less than 10 ml. By precisely controlling the drainage triggering conditions, the risk of electrical short circuits is effectively reduced. In implementation, this pressure range is selected based on a reasonable assessment of the condensate generation rate and the internal space of the device, ensuring timely drainage even with small amounts of liquid, preventing liquid accumulation. This application sets the opening pressure of the lower floor drain to 0.3-0.5 MPa, a pressure value higher than the 20 kPa air pressure test standard specified for IP67 protection level. This allows the device to maintain its drainage function even after passing the IP67 airtightness test, preventing moisture penetration into electrical components during long-term immersion. By increasing the pressure of the lower floor drain, the reliability and durability of the device in extreme environments are enhanced. The drainage assembly 230 includes a first floor drain 10 and a second floor drain 20 arranged in layers, facilitating compatibility between drainage function and protection level.

[0171] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0172] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0173] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. 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 all should be covered within the scope of protection claimed in this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various 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 protection claimed.

Claims

1. An energy storage device, characterized in that, The device includes a housing, a partition, a battery assembly, and a drainage assembly. The partition is disposed in the housing, which has a first accommodating space located above the partition along the direction of gravity and housing the battery assembly. The drainage assembly is disposed on the partition and located below the partition along the direction of gravity. The drainage assembly includes a first floor drain and a second floor drain, with the second floor drain located below the first floor drain along the direction of gravity. Along the direction of gravity, a buffer space is formed between the first drain and the second drain. The first drain is configured to connect the first receiving space and the buffer space, and the second drain is configured to connect the buffer space and the external environment. The opening pressure of the first drain is lower than that of the second drain.

2. The energy storage device according to claim 1, characterized in that, The projection of the first drain onto a projection plane perpendicular to the direction of gravity is projected along the direction of gravity, and at least a portion of the projection of the second drain overlaps with the projection of the first drain.

3. The energy storage device according to claim 1 or 2, characterized in that, The drainage assembly includes a sleeve, and the sleeve has the buffer space inside; Along the direction of gravity, the first floor drain and the second floor drain are detachably connected to the sleeve.

4. The energy storage device according to claim 3, characterized in that, The sleeve is provided with a first flange and a second flange. The first floor drain is bolted to the first flange, and the second floor drain is bolted to the second flange.

5. The energy storage device according to claim 3, characterized in that, The drainage assembly includes a seal disposed between the first floor drain and the inner wall of the sleeve, and the seal extends circumferentially along the first floor drain; and / or, the seal is disposed between the second floor drain and the inner wall of the sleeve, and the seal extends circumferentially along the second floor drain.

6. The energy storage device according to claim 3, characterized in that, The housing includes a bottom wall; along the direction of gravity, one end of the sleeve is connected to the partition plate, and the other end is connected to the bottom wall, and the second floor drain is located inside the sleeve.

7. The energy storage device according to claim 1 or 2, characterized in that, The partition includes a drainage section, which is located lower than other positions of the partition along the direction of gravity, and the drainage assembly is disposed in the drainage section.

8. The energy storage device according to claim 1 or 2, characterized in that, The opening pressure of the first floor drain is in the range of 0.05-0.15 MPa, and / or the opening pressure of the second floor drain is in the range of 0.3-0.5 MPa.

9. The energy storage device according to claim 6, characterized in that, The box has a main body and a door, and there is a sealing structure between the main body and the door. The partition plate divides the interior of the box into a first accommodating space and a second accommodating space, and the drainage component is located in the second accommodating space.

10. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device according to any one of claims 1 to 9, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

11. A charging network, characterized in that, The device includes a charging pile and an energy storage device according to any one of claims 1 to 9 or an energy storage system according to claim 10, wherein the energy storage device is used to provide electrical energy to the charging pile.

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