Energy storage device and energy storage system

Abstract

The utility model relates to an energy storage device and an energy storage system. The energy storage device comprises a box body and a battery, the box body comprises a plurality of wall plates, and the wall plates are connected and define a containing cavity; the battery is arranged in the accommodating cavity; wherein at least one wall plate is provided with a pressure relief part, and the pressure relief part and the wall plate are integrally formed; the pressure relief part is provided with a first notch groove, and the pressure relief part is configured to be capable of cracking along at least one part of the first notch groove so as to open the pressure relief part. According to the energy storage device, the pressure relief function is integrated on the wall plate, so that the box body has the pressure relief function, the use of an external pressure relief plate can be reduced, the purchase and installation requirements of equipment are reduced, the purchase and maintenance cost is reduced, the material and manufacturing cost is reduced, the overall cost is reduced, meanwhile, the installation process is simplified, the maintenance complexity is reduced, and the production efficiency is improved; and the pressure relief part can directly respond to the pressure change in the box body, so that the pressure relief efficiency can be improved, the explosion risk can be reduced, and the safety of the energy storage device can be improved.

Description

Technical Field

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

[0002] Energy storage devices contain a large number of batteries. When these batteries experience thermal runaway, flammable gases can accumulate, posing a risk of combustion and explosion to the energy storage device. Related technologies install pressure relief panels on the enclosure of the energy storage device, which open to release pressure and prevent explosion in the event of combustion or explosion. However, these pressure relief panels require procurement and installation, increasing costs and the complexity of installation and maintenance. Utility Model Content

[0003] In view of the above problems, this application provides an energy storage device and energy storage system that can reduce the procurement and installation of pressure relief plates, thereby reducing costs and installation and maintenance complexity.

[0004] In a first aspect, this application provides an energy storage device, comprising: a housing including a plurality of wall panels connected together and forming a receiving cavity; a battery disposed within the receiving cavity; wherein at least one wall panel is provided with a pressure relief portion, and the pressure relief portion is integrally formed with the wall panel; the pressure relief portion is provided with a first groove, and the pressure relief portion is configured to be able to split along at least a portion of the first groove to open the pressure relief portion.

[0005] In the technical solution of this application embodiment, by forming a first groove on the wall panel of the housing, a pressure relief part can be formed on the wall panel, realizing the integration of pressure relief function on the wall panel, so that the housing itself has a pressure relief function, realizing structural integration, reducing the use of external pressure relief plates, reducing equipment purchase and installation requirements, reducing procurement and maintenance costs, and reducing material and manufacturing costs, thereby reducing overall costs and improving economic efficiency. At the same time, it can simplify the installation process, reduce maintenance complexity, and improve production efficiency. Moreover, the pressure relief part can directly respond to pressure changes inside the housing, which can improve the efficiency of the pressure relief process, reduce the risk of explosion, and improve the safety of the energy storage device.

[0006] In some embodiments, the first groove is a groove extending along a closed pattern trajectory, and the enclosing area of ​​the first groove defines the pressure relief area of ​​the pressure relief section. This allows the pressure relief area defined by the first groove to completely detach from the wall panel, resulting in a larger open pressure relief area for the pressure relief section. This enables rapid release of pressure and gas, thereby improving pressure relief efficiency. Furthermore, the fully open pressure relief section can have a lower opening pressure, making the pressure relief section more responsive.

[0007] In some embodiments, the first groove has at least two ends, and the line connecting the at least two ends and the first groove together define a pressure relief area of ​​the pressure relief portion. Thus, the pressure relief portion can form at least one flip-type pressure relief area. After the pressure relief portion splits along the first groove, the pressure relief area can flip and open around the unclosed edge under pressure, facilitating pressure relief. The flipped-open pressure relief portion reduces the scattering of fragments, lowers the risk of secondary injury, and improves safety.

[0008] In some embodiments, the pressure relief section forms a first weak area in the region where the first groove is provided; the pressure relief section also has a second groove, the orthographic projection of the second groove on the pressure relief section is located between two adjacent ends of the orthographic projection of the first groove on the pressure relief section, and the second groove extends along the line connecting the two adjacent ends, and the pressure relief section forms a second weak area in the region where the first groove is provided; wherein, along the thickness direction of the wall panel, the thickness of the first weak area is D1, and the thickness of the second weak area is D2, satisfying D1 < D2. This reduces the torque required for the pressure relief section to flip open, improves the responsiveness of the pressure relief section to flip open, and increases the pressure relief area when flipped open, thereby improving both safety and pressure relief efficiency.

[0009] In some embodiments, the first groove and the second groove are respectively disposed on opposite sides of the pressure relief portion along the thickness direction of the wall plate. This structure, where the first groove and the second groove are independently disposed, reduces the stress influence between the first and second weak areas, reduces the phenomenon of the second weak area cracking due to the first weak area cracking during pressure relief, and facilitates the processing of the first groove and the second groove, reducing mutual interference between them during processing.

[0010] In some embodiments, the first groove is disposed on the side of the pressure relief portion facing the interior of the housing; or the first groove is disposed on the side of the pressure relief portion away from the interior of the housing. This helps to reduce the machining difficulty of the first groove.

[0011] In some embodiments, the pressure relief portion has first grooves on both opposite sides along the thickness direction of the wall panel. Thus, the pressure relief portion is formed simultaneously on both the inner and outer sides of the housing, allowing it to be processed and manufactured from both sides simultaneously. For larger housings, this reduces the processing difficulty of the pressure relief portion and improves processing efficiency.

[0012] In some embodiments, the orthographic projections of the first grooves on opposite sides of the wall panel along the thickness direction of the pressure relief section on the pressure relief section at least partially overlap. This allows the first weak area to be processed and manufactured from both the inside and outside of the housing, which, for thicker wall panels, helps reduce the processing difficulty of the first weak area and improves processing efficiency.

[0013] In some embodiments, the plurality of wall panels include a top wall, and a pressure relief portion is disposed on the top wall. Thus, in the event of thermal runaway of the battery, the energy storage device can vent from the top, reducing the potential for significant damage or casualties to the area surrounding the energy storage device upon explosion.

[0014] In some embodiments, the wall panel is provided with multiple pressure relief sections. Thus, during the pressure relief process, multiple pressure relief sections can be opened simultaneously to relieve pressure and prevent explosions, increasing the pressure relief area and improving the explosion relief capacity and efficiency of the energy storage device.

[0015] Secondly, this application provides an energy storage system, which includes the energy storage device in any of the above embodiments.

[0016] 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

[0017] 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:

[0018] Figure 1 This is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application.

[0019] Figure 2 This is a schematic diagram of the battery structure provided in some embodiments of this application.

[0020] Figure 3 The diagram shows the structure of the housing provided in some embodiments of this application.

[0021] Figure 4 This is a three-dimensional structural diagram of a wall panel provided in some embodiments of this application.

[0022] Figure 5 A perspective sectional view of a wall panel provided for some embodiments of this application.

[0023] Figure 6 A front view of a wall panel provided for some embodiments of this application.

[0024] Figure 7 Partial cross-sectional view of a wall panel provided for some embodiments of this application.

[0025] Figure 8This is a schematic diagram of the stress distribution in the pressure relief zone provided in some embodiments of this application.

[0026] Figure 9 This is an enlarged schematic diagram of another pressure relief section provided in some embodiments of this application.

[0027] Figure 10 This is an enlarged schematic diagram of another pressure relief section provided for some embodiments of this application.

[0028] Figure 11 This is an enlarged schematic diagram of another pressure relief section provided in some embodiments of this application.

[0029] Figure 12 This is an enlarged schematic diagram of another pressure relief section provided in some embodiments of this application.

[0030] Figure 13 This is an enlarged schematic diagram of yet another pressure relief section provided for some embodiments of this application.

[0031] Figure 14 This is an enlarged schematic diagram of another pressure relief section provided in some embodiments of this application.

[0032] Figure 15 This is a cross-sectional view of yet another pressure relief section provided for some embodiments of this application.

[0033] The reference numerals in the detailed embodiments are as follows:

[0034] 100. Energy storage devices;

[0035] 10. Housing; 101. Receiving cavity; 1. Wall panel; 11. Pressure relief section; 111. First groove; 1111. End; 112. Pressure relief area; 1121. Unsealed edge; 113. First weak area; 114. Second groove; 115. Second weak area; 12. Main body; 13. Top wall; 14. Bottom wall; 15. Side wall;

[0036] 20. Battery; 201. Battery cell; 202. Casing; 2021. First part; 2022. Second part. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0038] 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.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0040] In the description of the embodiments of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] In the description of the embodiments of this application, the terms "first" and "second" are used for descriptive purposes 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 or secondary relationship of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of the embodiments of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0043] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] It should be noted that an element is referred to as being "fixed to" or "set on" another element, which may be directly on the other element or may also include an intervening element. An element is considered to be "connected" to another element, which may be directly connected to the other element or may also include an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in the embodiments of this application are for illustrative purposes only and do not represent the only implementation.

[0046] From a market perspective, the application of batteries is becoming increasingly widespread. For example, batteries are used in power generation plants such as hydroelectric, thermal, wind, and solar power plants, or in energy storage devices within energy storage power systems. Energy storage devices typically consist of a large number of batteries centrally located in a casing. These batteries store electrical energy by converting it into chemical energy, releasing it during peak electricity demand and recharging it during off-peak periods. This allows energy storage devices to balance the load on the power system, alleviate the pressure on grid peak shaving and frequency regulation, and improve grid stability and reliability. Energy storage devices can also serve as emergency backup power, providing a continuous and stable power supply during power system failures or natural disasters. However, because thermal runaway of the batteries in an energy storage device can lead to the accumulation of large amounts of flammable gases, the energy storage device poses a risk of combustion and explosion.

[0047] To mitigate the risk of explosion in energy storage devices, pressure relief can be implemented promptly when the internal pressure of the energy storage device increases rapidly, thereby reducing the risk of explosion.

[0048] In related technologies, energy storage devices typically use pressure relief plates installed on the enclosure to achieve pressure relief. Pressure relief plates are usually considered safety accessories, and their structure and functional requirements necessitate specialized design, manufacturing, and installation on the enclosure in a specific manner. For example, the pressure relief plate may be manufactured separately and installed via bolts or other fixing methods at a pre-drilled flange on the top of the energy storage device's enclosure. The pressure relief plate uses a pre-set fracture point; when the internal pressure of the energy storage device reaches a certain threshold, it mechanically breaks, opening to achieve rapid pressure relief and gas release. However, the need for separate manufacturing and procurement of pressure relief plates increases costs. The requirement to reserve installation positions on the enclosure and perform corresponding fixing and sealing increases the complexity of installation and maintenance. Furthermore, the opening of the pressure relief plate depends on changes in the internal pressure of the enclosure. However, the pressure relief plate's response speed to changes in internal pressure is relatively slow, potentially failing to complete gas release in a very short time, affecting gas release efficiency and resulting in low explosion relief efficiency. If the pressure relief plate fails to open in time and cannot release pressure promptly, it may cause a larger-scale explosion.

[0049] Based on the above considerations, to address the issue of pressure relief plates requiring separate procurement and installation, which increases costs and installation / maintenance complexity, this application designs an energy storage device. By directly slotting and grooved into the energy storage device's casing, the casing itself possesses pressure relief functionality, achieving the same pressure relief effect as a pressure relief plate. This design reduces the need for separate purchase and installation of pressure relief plates, lowers procurement and maintenance costs, simplifies the installation process, reduces installation / maintenance complexity, and the integrated pressure relief structure improves the efficiency of the pressure relief process, reduces the risk of explosion, and enhances the safety of the casing.

[0050] The energy storage device disclosed in this application can be applied, but is not limited to, energy storage systems in power generation sites such as wind power, hydropower, photovoltaic, and thermal power plants to balance the voltage of power plants and alleviate the problem of large intermittent fluctuations in power generation. Of course, it can also be applied to other energy storage power systems, such as energy storage systems in power distribution sites, energy storage systems in large-scale industrial, commercial, and residential sectors, backup power supplies, smart charging stations, and other emerging fields. It can provide intelligent load management for the transmission and distribution side, timely peak shaving and frequency regulation based on grid load conditions, and provide users with peak shaving and valley filling modes and stable power quality management, achieving electricity coverage, reducing social electricity costs, and improving user-side electricity security. This helps reduce costs, simplify installation and maintenance, and improve safety.

[0051] According to some embodiments of this application, refer to Figures 1 to 6 , Figure 1 The following are schematic diagrams of the energy storage device in some embodiments of this application. Figure 2 The following are schematic diagrams of the battery structure in some embodiments of this application. Figure 3 The following are schematic diagrams of the structure of the box in some embodiments of this application. Figure 4 A three-dimensional structural schematic diagram of the wall panel in some embodiments of this application is shown. Figure 5 A perspective sectional view of the wall panel in some embodiments of this application is shown. Figure 6 A front view of a wall panel in some embodiments of this application is shown. This application provides an energy storage device 100. The energy storage device 100 includes a housing 10 and a battery 20 disposed within the housing 10. The housing 10 includes a plurality of wall panels 1, which are connected and enclose a receiving cavity 101, and the battery 20 is disposed within the receiving cavity 101. At least one wall panel 1 is provided with a pressure relief portion 11, and the pressure relief portion 11 is integrally formed with the wall panel 1. The pressure relief portion 11 is provided with a first groove 111, and the pressure relief portion 11 is configured to be able to split along at least a portion of the first groove 111 to open the pressure relief portion 11.

[0052] The energy storage device 100 may include multiple batteries 20, which are centrally located inside the housing 10. The multiple batteries 20 are used to store or output electrical energy for use when needed.

[0053] The battery 20 can adopt various structures. For example, the battery 20 may include a battery module or a battery pack. (See reference...) Figure 2 The battery 20 may include a battery cell 201 and a casing 202, with the battery cell 201 housed within the casing 202. The casing 202 provides housing space for the battery cell 201, reducing the impact of liquids or other foreign matter on the charging or discharging of the battery cell 201. The casing 202 can employ various structures. For example, see reference... Figure 2 The outer casing 202 may include a first portion 2021 and a second portion 2022, which overlap each other, together defining a receiving space for accommodating the battery cell 201. The second portion 2022 may be a hollow structure with an opening on one side, and the first portion 2021 may be a plate-like structure, covering the opening side of the second portion 2022 so that the first portion 2021 and the second portion 2022 together define the receiving space. Alternatively, both the first portion 2021 and the second portion 2022 may be hollow structures with openings on one side, with the opening side of the first portion 2021 covering the opening side of the second portion 2022. Of course, the outer casing 202 formed by the first portion 2021 and the second portion 2022 can be of various shapes, such as a cylinder, a cuboid, etc.

[0054] In battery 20, there can be multiple battery cells 201, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 201 are connected in both series and parallel. Multiple battery cells 201 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 201 is housed within the casing 202 of battery 20. Alternatively, battery 20 can also be composed of multiple battery cells 201 first connected in series, parallel, or in a mixed configuration to form a battery module, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the casing 202. Battery 20 may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells 201. Each battery cell 201 can be a rechargeable battery; it can also be a lithium-ion battery, lithium-sulfur battery, sodium-ion battery, or magnesium-ion battery, but is not limited to these. Battery cells 201 can be cylindrical, flat, cuboid, or other shapes, meaning that battery cells 201 are not limited to prismatic batteries and can also be cylindrical batteries, etc.

[0055] The housing 10 provides storage space for the battery 20, reducing the impact of the environment, liquids, or other foreign objects on the battery 20's ability to store or output electricity. This application does not specifically limit the shape of the housing 10; for example, in some embodiments, the housing 10 may be approximately cube-shaped, cylindrical, prismatic, etc. For example, referring to… Figure 3 The enclosure 10 may include a top wall 13, a bottom wall 14, and multiple side walls 15, with the top wall 13 and bottom wall 14 facing each other. The multiple side walls 15 are connected between the top wall 13 and bottom wall 14, forming an enclosure 10 that is generally rectangular in shape. The wall panels 1 are plate-shaped and may be, but are not limited to, flat plates, curved plates, corrugated plates, etc. The material of the wall panels 1 may be, but is not limited to, copper, iron, aluminum, steel, and their alloys.

[0056] Since the energy storage device 100 includes multiple batteries 20, and each battery 20 includes multiple battery cells 201, it is understandable that the large number of battery cells 201 concentrated together can easily lead to the accumulation of a large amount of combustible gas when the battery 20 experiences thermal runaway, causing the pressure inside the housing 10 to increase sharply.

[0057] To release the internal pressure of the housing 10, a pressure relief section 11 can be provided on at least one wall panel 1 of the housing 10. In this embodiment, the position and number of wall panels 1 with pressure relief sections 11 are not specifically limited. For example, in some embodiments, the wall panel 1 with pressure relief sections 11 can be the top wall 13, the bottom wall 14, or the side wall 15 of the housing 10, or both the top wall 13 and the side wall 15 can be provided with pressure relief sections 11, etc.

[0058] The pressure relief section 11 can be a pressure relief structure formed on the wall panel 1 using an integral molding process. The pressure relief section 11 includes a first groove 111 provided on the wall panel 1. For example, the first groove 111 can be formed by, but is not limited to, stamping or milling processes. It is understood that the area with the first groove 111 is relatively thinner than other areas of the wall panel 1, and when subjected to the same pressure, the area with the first groove 111 is more prone to cracking. The first groove 111 can be, but is not limited to, an annular groove, an arc-shaped groove, or a straight groove. The cross-sectional shape of the first groove 111 (i.e., the cross-section perpendicular to the extension direction of the first groove 111) can be, but is not limited to, a triangle, a trapezoid, a rectangle, etc.

[0059] When the battery 20 in the housing cavity 101 experiences thermal runaway and generates a large amount of gas, causing the internal pressure of the housing 10 to reach the opening pressure of the pressure relief section 11, the area with the first groove 111 is more prone to cracking. The pressure relief section 11 can crack along at least a portion of the first groove 111, causing at least a partial separation of the pressure relief section 11 from the wall plate 1. This opens the pressure relief section 11 relative to the wall plate 1, forming a pressure relief channel, allowing the housing cavity 101 to communicate with the outside. The gas and emission medium generated by the battery 20 can then be discharged outside the housing 10, thus releasing the internal pressure of the housing 10. In this way, the internal gas pressure of the housing 10 can be reduced, thereby reducing the risk of explosion, achieving pressure relief and explosion prevention of the housing 10, and improving the safety of the energy storage device 100.

[0060] The opening pressure of the pressure relief section 11 refers to the pressure at which the pressure relief section 11 needs to be opened to perform its pressure relief function, as preset. For example, the opening pressure of the pressure relief section 11 can be set during the manufacturing of the housing 10. When the internal pressure of the housing 10 reaches the opening pressure of the pressure relief section 11, it will cause the pressure relief section 11 to separate from the wall panel 1 at least partially, thereby opening the pressure relief section 11.

[0061] In some embodiments, reference is made to Figures 4 to 7 , Figure 7A partial cross-sectional view of a wall panel 1 according to some embodiments of this application is shown, where the Z direction is the thickness direction of the wall panel 1. The pressure relief section 11 includes a pressure relief area 112, and a first groove 111 at least partially defines the pressure relief area 112 of the pressure relief section 11. The pressure relief area 112 refers to a pre-defined opening area in which the pressure relief section 11 opens relative to the wall panel 1 during pressure relief. The area of ​​the pressure relief area 112 is the opening area of ​​the pressure relief section 11. The pressure relief section 11 forms a first weak area 113 in the area where the first groove 111 is provided. For example, the first weak area 113 may be formed by the bottom wall of the first groove 111. The wall panel 1 may also include a body section 12. The first weak area 113 is connected to the pressure relief area 112 and the body section 12. It is understood that along the thickness direction Z of the wall panel 1, the thickness of the first weak zone 113 is less than the thickness of the main body 12 and the thickness of the pressure relief zone 112, making the first weak zone 113 weaker and easier to break. When the internal pressure of the housing 10 exceeds the opening pressure of the pressure relief section 11, the first weak zone 113 can automatically break, allowing the pressure relief section 11 to crack along at least a portion of the first groove 111, and the pressure relief zone 112 to at least partially detach from the wall panel 1. The pressure relief section 11 then opens to release pressure, thereby realizing the pressure relief and explosion relief function of the pressure relief section 11.

[0062] The dimensional parameters of the pressure relief section 11 can be calculated and determined based on the required opening pressure. For example, the dimensional parameters of the pressure relief section 11 may include the opening area of ​​the pressure relief section 11, the depth of the first groove 111, etc. Figure 8 As shown, Figure 8 The diagram illustrates the force distribution of the pressure relief zone 112 in some embodiments of this application. In the diagram, the X direction represents the long side of the pressure relief zone 112, the Y direction represents the short side, and the Z direction represents the thickness direction of the wall panel 1. Hollow arrows indicate the direction of pressure application. Taking a rectangular shape for the pressure relief zone 112 as an example, with a long side length of 'a' and a short side length of 'b', the opening area S of the pressure relief section 11 should satisfy: S = a·b. The opening pressure of the pressure relief section 11 can be set as pressure P. Then, the pressure F acting on the pressure relief zone 112 should satisfy: F = P·S = P·a·b.

[0063] The thickness of the first weak zone 113 is D1. The thickness D1 of the first weak zone 113 is the residual thickness of the wall panel 1 in the area where the first groove 111 is formed. The thickness of the wall panel 1 is L. For example... Figure 7 As shown in the figure, taking the first groove 111 provided on both sides of the thickness direction Z of the wall panel 1 as an example, the depth of the first groove 111 on one side is d1, and the depth of the first groove 111 on the other side is d2. Then the thickness D1 of the first weak area 113 satisfies: D1=L-d1-d2.

[0064] If the opening position of the pressure relief section 11 surrounds the pressure relief area 112, that is, the first weak area 113 is set around the pressure relief area 112, then the shear area A1 of the first weak area 113 satisfies: A1=(2a+2b)·D1.

[0065] Since the shear force on the first weak zone 113 is equal to the pressure F on the pressure relief zone 112, according to the shear stress calculation formula, the shear stress t1 on the first weak zone 113 at this time should satisfy: t1=F / A1=(P·a·b) / ((2a+2b)·D1).

[0066] That is, the thickness D1 of the first weak zone 113 should satisfy: D1=(P·a·b) / ((2a+2b)·t1).

[0067] When the shear stress t1 on the first weak zone 113 reaches the maximum shear strength of the wall panel 1 material, the first weak zone 113 will be torn apart, and the pressure relief zone 112 will open to relieve pressure inside the box 10.

[0068] By changing the thickness D1 of the first weak zone 113, the set opening pressure of the pressure relief section 11 can be achieved. Alternatively, by adjusting the thickness D1 of the first weak zone 113, different opening pressures of the pressure relief section 11 can be achieved for the same housing 10 and the same pressure relief zone 112 area, thereby achieving the purpose of staged explosion relief.

[0069] If the opening position of the pressure relief part 11 is around the three sides of the pressure relief area 112, for example, the pressure relief area 112 can be opened by flipping around the long side, then the shear area A2 of the first weak area 113 satisfies: A2=(2a+b)·D1.

[0070] At this time, the shear stress t2 of the first weak zone 113 should satisfy: t2=(P·a·b) / ((2a+b)·D1). That is, the thickness D1 of the first weak zone 113 should satisfy: D1=(P·a·b) / ((2a+b)·t2).

[0071] Flipping open the pressure relief section 11 may require greater force or more precise pressure control to improve the success rate of the pressure relief section 11 opening automatically at the opening pressure.

[0072] By designing the shape and size of the pressure relief part 11, the pressure relief part 11 can be opened at a designated position to form a pressure relief channel. It can also increase the success rate of the pressure relief part 11 automatically opening when the internal pressure of the housing 10 reaches the opening pressure of the pressure relief part 11, thereby achieving the same pressure relief effect as an external pressure relief plate.

[0073] Because the first groove 111 is directly formed on the wall panel 1 of the housing 10, the pressure relief part 11 can at least partially crack along the first groove 111 when the energy storage device 100 is depressurized, thereby opening the pressure relief part 11. The pressure relief part 11 can achieve the same pressure relief effect as an external pressure relief plate, realizing the integration of pressure relief function on the wall panel 1, so that the housing 10 itself has a pressure relief function. In this way, it is possible to eliminate the need to connect other external pressure relief devices to the housing 10, thereby reducing the use of pressure relief devices such as external pressure relief plates, reducing equipment purchase requirements, and lowering procurement and maintenance costs. Since the pressure relief part 11 is integrally formed with the wall panel 1, the structure is integrated, eliminating the installation requirements of the pressure relief part 11, eliminating the need to reserve installation positions on the housing 10 and to perform corresponding fixing and sealing, simplifying the installation process, reducing the complexity of installation and maintenance, and improving production efficiency.

[0074] Since the pressure relief section 11 is used in scenarios where the battery 20 experiences thermal runaway, it needs to react stably and quickly to reduce the internal pressure of the housing 10 in a timely manner, thereby reducing the risk of explosion and achieving pressure relief and explosion venting of the housing 10, thus improving the safety of the energy storage device 100. During explosion venting, the pressure relief section 11 passively opens relative to the housing 10. Passive opening means that the pressure relief section 11 deforms or is damaged under pressure, thus activating its explosion and pressure relief function. The pressure relief section 11 can preferentially open relative to the housing 10, achieving passive explosion venting of the housing 10. Explosion energy is preferentially released outward from the opened pressure relief section 11, reducing the degree of damage to the energy storage device 100. Passive explosion venting of the housing 10 refers to passive explosion and pressure relief, i.e., the explosion venting method that occurs when the pressure relief section 11 is passively opened. It is understandable that passive is relative to active. Active explosion venting requires sensors and controllers for active control, while passive explosion venting does not require sensors and controllers and can directly respond to pressure changes in the containment cavity 101. Therefore, passive explosion venting is more timely and more stable than active explosion venting.

[0075] The energy storage device 100 of this application embodiment forms a pressure relief part 11 on the wall panel 1 of the housing 10 by forming a first groove 111 on the wall panel 1, thereby integrating the pressure relief function on the wall panel 1. This enables the housing 10 itself to have a pressure relief function, achieving structural integration. This reduces the use of external pressure relief plates, reduces equipment purchase and installation requirements, lowers procurement and maintenance costs, and reduces material and manufacturing costs, thereby reducing overall costs and improving economic efficiency. At the same time, it simplifies the installation process, reduces maintenance complexity, and improves production efficiency. Moreover, the pressure relief part 11 can directly respond to pressure changes inside the housing 10, which can improve the efficiency of the pressure relief process, reduce the risk of explosion, and improve the safety of the energy storage device 100.

[0076] In some embodiments, refer to Figures 4 to 6 and Figure 9 , Figure 9 A schematic diagram of another pressure relief section 11 in some embodiments of this application is shown. The first groove 111 is a groove extending along a closed pattern trajectory, and the enclosing area of ​​the first groove 111 defines the pressure relief area 112 of the pressure relief section 11.

[0077] The first groove 111 is a groove extending along the trajectory of a closed shape, meaning that the orthographic projection of the first groove 111 onto the pressure relief part 11 forms a closed shape. The closed shape can be, but is not limited to, polygons, circles, ellipses, oblong shapes, etc. For example... Figures 4 to 6 As shown, the first groove 111 can be a rectangular annular groove formed by four connected straight groove segments. For example... Figure 9 As shown, the first groove 111 can be an elongated annular groove formed by connecting two straight groove segments and two semi-circular arc groove segments.

[0078] In this embodiment, the first groove 111 defines a pressure relief area 112, and the first weak area 113 surrounds and connects to the outline boundary of the pressure relief area 112. That is, the pressure relief area 112 is connected to the body portion 12 of the wall panel 1 through the first weak area 113. At this time, the opening position of the pressure relief part 11 surrounds the pressure relief area 112. During the pressure relief process, after the pressure relief part 11 splits along the first groove 111, the pressure relief area 112 defined by the first groove 111 can be completely separated from the wall panel 1, thereby releasing pressure and gas.

[0079] In some embodiments, the depth of the first groove 111 in the thickness direction Z of the wall panel 1 is the same at all locations around the pressure relief area 112. In this way, the thickness of the first weak area 113 around the pressure relief area 112 is the same, which is beneficial to the simultaneous and complete breakage of the first weak area 113 around the pressure relief area 112, which is beneficial to improving the opening efficiency of the pressure relief part 11, and thus improving the pressure relief efficiency.

[0080] By setting the first groove 111 to extend along the closed pattern trajectory, the pressure relief area 112 defined by the first groove 111 can be completely separated from the wall plate 1, the pressure relief part 11 opens to a larger pressure relief area, and can quickly release pressure and gas, thereby improving the pressure relief efficiency. Moreover, the pressure relief part 11 with all four sides open can have a lower opening pressure, making the pressure relief part 11 more responsive.

[0081] In some embodiments, refer to Figures 10 to 13 , Figure 10 This paper shows a schematic diagram of the structure of another pressure relief section 11 in some embodiments of this application. Figure 11 This paper shows a schematic diagram of the structure of another pressure relief section 11 in some embodiments of this application. Figure 12 This illustration shows a structural schematic diagram of another pressure relief section 11 in some other embodiments of this application. Figure 13The diagram shows a structural schematic of another pressure relief section 11 in some embodiments of this application. The first groove 111 has at least two ends 1111, and the line connecting the at least two ends 1111 and the first groove 111 together define the pressure relief area 112 of the pressure relief section 11.

[0082] The first groove 111 may also extend along a non-closed pattern trajectory, such that the orthographic projection of the first groove 111 on the pressure relief portion 11 also has at least two ends 1111. The first groove 111 has an end face at each end 1111. The line connecting the two ends 1111 refers to the line connecting the points on the orthographic projection of the end faces of the two ends 1111 on the pressure relief portion 11. The line connecting the at least two ends 1111 and the first groove 111 together define the pressure relief area 112 of the pressure relief portion 11, such that an unclosed edge 1121 of the pressure relief area 112 is formed between two adjacent ends 1111. The non-closed pattern can include various shapes, such as a "U" shape, an "H" shape, an "X" shape, a double "Y" shape, a "V" shape, an arc shape, etc.

[0083] For example Figure 10 As shown, the first groove 111 can be a "U"-shaped groove formed by connecting three straight groove segments, wherein two straight groove segments are arranged in parallel opposite directions, and the third straight groove segment connects the ends 1111 on the same side of the two straight groove segments. In this case, the first groove 111 has two ends 1111, and the first groove 111 surrounds three sides of the contour of the pressure relief zone 112. The line connecting the two ends 1111 and the first groove 111 together define the pressure relief zone 112, and an unclosed edge 1121 of the pressure relief zone 112 is formed between the two ends 1111. The opening position of the pressure relief part 11 is at the three sides of the pressure relief zone 112 formed by the first groove 111. During the pressure relief process, the pressure relief part 11 cracks along the first groove 111, and can rupture at the three groove segments surrounding the three sides of the pressure relief zone 112. Under pressure, the pressure relief zone 112 flips open around the unclosed edge 1121, thereby releasing pressure and gas.

[0084] For example Figure 11As shown, the first groove 111 can be an "H"-shaped groove formed by connecting three straight groove segments, wherein two straight groove segments are arranged in parallel opposite directions, and the third straight groove segment connects the middle of the two straight groove segments. In this case, the first groove 111 has four ends 1111. The line connecting two adjacent ends 1111 and the first groove 111 together define two pressure relief zones 112. The two pressure relief zones 112 are located on opposite sides of the third straight groove segment of the first groove 111, and the unclosed edge 1121 of the pressure relief zone 112 is located between corresponding adjacent ends 1111. The opening position of the pressure relief section 11 is at the three sides of the first groove 111 surrounding the two pressure relief zones 112. During the pressure relief process, the two pressure relief zones 112 can be flipped open under pressure around their respective unclosed edges 1121, thereby releasing pressure and gas.

[0085] For example Figure 12 As shown, the first groove 111 can be formed by two straight groove segments intersecting and connecting to form an "X" shaped groove. In this case, the first groove 111 has four ends 1111. The line connecting two adjacent ends 1111 and the first groove 111 together define four triangular pressure relief zones 112. The unclosed edges 1121 of the pressure relief zones 112 are located between corresponding adjacent ends 1111. The opening position of the pressure relief section 11 is at two sides of the first groove 111 surrounding each pressure relief zone 112. During the pressure relief process, the pressure relief section 11 splits along the first groove 111, and each pressure relief zone 112 flips open around its respective unclosed edge 1121 under pressure, thereby releasing pressure and gas.

[0086] For example Figure 13 As shown, the first groove 111 can be formed by connecting one straight groove segment and four oblique straight groove segments to form a double "Y" shaped groove. Specifically, two oblique straight groove segments are connected to one end of the straight groove segment, and the other two oblique straight groove segments are connected to the other end of the straight groove segment. The angle between the two oblique straight groove segments at the same end of the straight groove segment and the straight groove segment is greater than 90 degrees and less than 180 degrees. In this case, the first groove 111 has four ends 1111. The line connecting two adjacent ends 1111 and the first groove 111 together define four pressure relief zones 112. The unclosed edge 1121 of each pressure relief zone 112 is located between corresponding adjacent ends 1111. The opening position of the pressure relief section 11 is at the edge of the first groove 111 surrounding each pressure relief zone 112. During the pressure relief process, after the pressure relief section 11 splits along the first groove 111, each pressure relief zone 112 flips open under pressure around its respective unclosed edge 1121, thereby releasing pressure and gas.

[0087] Thus, the pressure relief section 11 can form at least one flip-type pressure relief area 112. After the pressure relief section 11 splits along the first groove 111, the pressure relief area 112 can flip and open around the unclosed edge 1121 under pressure, facilitating pressure relief by the pressure relief section 11. The flipped and opened pressure relief section 11 can reduce the scattering of fragments of the pressure relief section 11, reduce the risk of secondary injury, and improve safety.

[0088] In some embodiments, refer to Figures 14 to 15 , Figure 14 A cross-sectional view of another pressure relief section 11 in some embodiments of this application is shown. Figure 15 A cross-sectional view of another pressure relief section 11 in some embodiments of this application is shown. The pressure relief section 11 forms a first weak region 113 in the area where the first groove 111 is provided. The pressure relief section 11 is also provided with a second groove 114. The orthographic projection of the second groove 114 on the pressure relief section 11 is located between two adjacent ends 1111 of the orthographic projection of the first groove 111 on the pressure relief section 11, and the second groove 114 extends along the line connecting the two adjacent ends 1111. The pressure relief section 11 forms a second weak region 115 in the area where the second groove 114 is provided. Wherein, along the thickness direction Z of the wall panel 1, the thickness of the first weak region 113 is D1, and the thickness of the second weak region 115 is D2, satisfying D1 < D2.

[0089] In this embodiment, the first groove 111 is a groove extending along a non-closed pattern trajectory, such that the orthographic projection of the first groove 111 on the pressure relief section 11 has at least two ends 1111. During the pressure relief process, the pressure relief area 112 can be flipped open under pressure around the unclosed side located between two adjacent ends 1111 to release pressure and gas. A second groove 114 is provided on the wall panel 1, for example, the second groove 114 can be formed by, but is not limited to, processing processes such as stamping or milling. It is understood that the area where the second groove 114 is provided, i.e., the second weak area 115, is weaker than other areas on the wall panel 1 except for the first weak area 113, and the second weak area 115 is more prone to deformation when subjected to the same magnitude of force. Meanwhile, the orthographic projection of the second groove 114 onto the pressure relief section 11 is located between two adjacent ends 1111 of the orthographic projection of the first groove 111 onto the pressure relief section 11, and the second groove 114 extends along the line connecting the two adjacent ends 1111. In other words, the second weak area 115 is located on the unclosed side of the pressure relief section 112. Because the second weak area 115 is more prone to deformation, the pressure relief section 112 can rotate around the second weak area 115 as an axis when it is opened. The cross-sectional shape of the second groove 114 (i.e., the cross-section perpendicular to the extension direction of the second groove 114) can be, but is not limited to, a triangle, trapezoid, rectangle, etc.

[0090] Wherein, the thickness D1 of the first weak region 113 is the residual thickness of the wall panel 1 in the area where the first groove 111 is set, and correspondingly, the thickness D2 of the second weak region 115 is the residual thickness of the wall panel 1 in the area where the second groove 114 is set. Since the thickness D1 of the first weak region 113 is less than the thickness D2 of the second weak region 115, the strength of the first weak region 113 is less than that of the second weak region 115. When subjected to a considerable amount of pressure, the first weak region 113 is more likely to fracture than the second weak region 115, allowing the first groove 111 to crack preferentially over the second groove 114. During the pressure relief process, after the pressure relief part 11 cracks preferentially along the first groove 111, the pressure relief area 112 can be flipped and opened around the second weak region 115 under pressure, thereby releasing pressure and gas.

[0091] In this way, the torque required for the pressure relief zone 112 to flip open can be reduced, the response sensitivity of the pressure relief zone 112 to flip open can be improved, and the pressure relief area of ​​the flip opening can be increased, thereby improving safety and pressure relief efficiency.

[0092] In some embodiments, refer to Figure 15 The first groove 111 and the second groove 114 are respectively disposed on opposite sides of the pressure relief part 11 along the thickness direction Z of the wall plate 1.

[0093] Alternatively, the first groove 111 may be located on the side of the pressure relief section 11 facing away from the interior of the housing 10, and the second groove 114 may be located on the side of the pressure relief section 11 facing the interior of the housing 10.

[0094] Since the first groove 111 and the second groove 114 are located on opposite sides of the wall panel 1, the first groove 111 and the second groove 114 are independently set structures.

[0095] In this way, the first groove 111 and the second groove 114 are independently set structures, which can reduce the stress influence between the first weak area 113 and the second weak area 115, reduce the phenomenon that the cracking of the first weak area 113 during pressure relief will cause the cracking of the second weak area 115, and facilitate the processing of the first groove 111 and the second groove 114, reducing the mutual influence between the first groove 111 and the second groove 114 during the processing.

[0096] In some embodiments, the first groove 111 is provided on the side of the pressure relief portion 11 facing the interior of the housing 10.

[0097] That is, the first groove 111 is provided on the surface of the wall panel 1 facing the inside of the housing 10.

[0098] In this way, the first groove 111 can be formed on the inside of the housing 10, which makes it easier to process and manufacture the first groove 111 from the inside of the housing 10. For housings with larger dimensions, this helps to reduce the processing difficulty of the first groove 111.

[0099] In some embodiments, the first groove 111 is provided on the side of the pressure relief portion 11 away from the interior of the housing 10.

[0100] In other words, the first groove 111 is provided on the surface of the wall panel 1 on the side away from the interior of the housing 10.

[0101] In this way, the first groove 111 can be formed on the outside of the housing 10, which makes it easier to process and manufacture the first groove 111 from the outside of the housing 10, and helps to reduce the processing difficulty of the first groove 111.

[0102] In some embodiments, refer to Figure 5 and Figure 7 The pressure relief section 11 has first grooves 111 on both opposite sides along the thickness direction Z of the wall plate 1.

[0103] The depths of the first grooves 111 on opposite sides of the pressure relief section 11 along the thickness direction Z of the wall panel 1 can be the same. Alternatively, the depth of the first groove 111 on the side of the pressure relief section 11 facing the interior of the housing 10 can be greater than the depth of the first groove 111 on the side of the pressure relief section 11 facing away from the interior of the housing 10; or the depth of the first groove 111 on the side of the pressure relief section 11 facing the interior of the housing 10 can be less than the depth of the first groove 111 on the side of the pressure relief section 11 facing away from the interior of the housing 10.

[0104] Thus, the pressure relief part 11 is a structure that is simultaneously formed on the inner and outer sides of the housing 10. The pressure relief part 11 can be processed and manufactured from both the inner and outer sides of the housing 10. For a housing 10 with a large size, this helps to reduce the processing difficulty of the pressure relief part 11 and improve processing efficiency.

[0105] In some embodiments, the orthographic projections of the first grooves 111 on opposite sides of the pressure relief section 11 along the thickness direction Z of the wall plate 1 at least partially overlap on the pressure relief section 11.

[0106] By setting the first grooves 111 on opposite sides of the pressure relief section 11 along the thickness direction Z of the wall plate 1 to at least partially overlap on the pressure relief section 11, at least a portion of the first weak region 113 is formed by the bottom groove walls of the first grooves 111 on opposite sides of the pressure relief section 11. At this time, the thickness of the first weak region 113 is the residual thickness of the two first grooves 111.

[0107] In this way, the first weak area 113 can be processed and manufactured from the inside and outside of the box 10. For the thicker wall panel 1, this helps to reduce the processing difficulty of the first weak area 113 and improve processing efficiency.

[0108] In some embodiments, refer to Figure 3 The multiple wall panels 1 include a top wall 13, and a pressure relief part 11 is disposed on the top wall 13.

[0109] In some embodiments, the multiple wall panels 1 of the housing 10 may further include a bottom wall 14 and multiple side walls 15, with the bottom wall 14 disposed opposite to the top wall 13, and the multiple side walls 15 connected between the top wall 13 and the bottom wall 14 to enclose and form a receiving cavity 101. In some embodiments, the side walls 15 may include a front wall, a rear wall, a left wall, and a right wall, with the front wall and rear wall opposite to each other, and the left wall and right wall opposite to each other. The top wall 13, bottom wall 14, front wall, rear wall, left wall, and right wall are connected to form a generally cuboid-shaped housing 10. It is understood that in other embodiments, the pressure relief part 11 may also be disposed on the side wall 15 or the bottom wall 14.

[0110] By installing the pressure relief section 11 on the top wall 13 of the housing 10, the energy storage device 100 can release the pressure from the top when the battery 20 experiences thermal runaway, which can reduce the major damage or casualties to the area around the energy storage device 100 during the explosion.

[0111] In some embodiments, refer to Figures 3 to 6 Multiple pressure relief sections 11 are provided on the wall panel 1.

[0112] The number of pressure relief parts 11 provided on the wall panel 1 can be one or more, such as two, three, four or five, etc.

[0113] By setting multiple pressure relief sections 11, multiple pressure relief sections 11 can be opened simultaneously during the pressure relief process to relieve pressure and explosion, thereby increasing the pressure relief area and improving the explosion relief capacity and efficiency of the energy storage device 100.

[0114] According to some embodiments of this application, this application also provides an energy storage system. The energy storage system includes the energy storage device 100 provided in any of the above embodiments.

[0115] The energy storage system can be an energy storage system for power plants such as wind power and photovoltaic power plants. An energy storage system for the power plant can be constructed using the energy storage device 100 disclosed in this application.

[0116] Since the energy storage system has the same technical effect as the energy storage device 100 described above, it will not be described again here.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage device, characterized in that, include: The enclosure includes multiple wall panels that are connected and enclose a receiving cavity. The battery is disposed within the receiving cavity; In this embodiment, at least one of the wall panels is provided with a pressure relief portion, and the pressure relief portion is integrally formed with the wall panel; the pressure relief portion is provided with a first groove, and the pressure relief portion is configured to be able to split along at least a portion of the first groove to open the pressure relief portion.

2. The energy storage device according to claim 1, characterized in that, The first groove is a groove extending along a closed pattern trajectory, and the enclosing area of ​​the first groove defines the pressure relief area of ​​the pressure relief part.

3. The energy storage device according to claim 1, characterized in that, The first groove has at least two ends, and the line connecting the at least two ends and the first groove together define the pressure relief area of ​​the pressure relief part.

4. The energy storage device according to claim 3, characterized in that, The pressure relief section forms a first weak zone in the area where the first groove is set; The pressure relief part is also provided with a second groove. The orthographic projection of the second groove on the pressure relief part is located between two adjacent ends of the orthographic projection of the first groove on the pressure relief part. The second groove extends along the line connecting the two adjacent ends. The pressure relief part forms a second weak area in the area where the first groove is provided. Wherein, along the thickness direction of the wall panel, the thickness of the first weak area is D1, and the thickness of the second weak area is D2, satisfying D1 < D2.

5. The energy storage device according to claim 4, characterized in that, The first groove and the second groove are respectively disposed on opposite sides of the pressure relief part along the thickness direction of the wall plate.

6. The energy storage device according to claim 1, characterized in that, The first groove is located on the side of the pressure relief section facing the interior of the housing; Alternatively, the first groove may be located on the side of the pressure relief section opposite to the interior of the housing.

7. The energy storage device according to claim 1, characterized in that, The pressure relief section has the first groove on each of its opposite sides along the thickness direction of the wall plate.

8. The energy storage device according to claim 7, characterized in that, The first grooves located on opposite sides of the pressure relief section along the thickness direction of the wall plate have orthogonal projections on the pressure relief section that at least partially overlap.

9. The energy storage device according to any one of claims 1 to 8, characterized in that, The plurality of wall panels includes a top wall, and the pressure relief part is disposed on the top wall; And / or, the wall panel is provided with a plurality of the pressure relief sections.

10. An energy storage system, characterized in that, The energy storage system includes: the energy storage device as described in any one of claims 1 to 9.

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