Battery device, energy storage device, energy storage system and charging network

Abstract

The utility model discloses a battery device, an energy storage device, an energy storage system and a charging network, and belongs to the technical field of batteries. The battery device comprises a box body, a first battery monomer assembly and a first insulating part; the box body comprises a first beam body, and a first collecting cavity is formed in the first beam body; the first battery monomer assembly is arranged in the box body, the first battery monomer assembly comprises a plurality of first battery monomers arranged along a first direction, the first beam body is positioned on one side of the first battery monomer assembly along a second direction, and the first direction is perpendicular to the second direction; a first pressure relief mechanism is arranged on the side, facing the first beam body, of the first battery monomer, a first through hole communicated with the first collecting cavity is formed in the side, facing the first battery monomer assembly, of the first beam body, and the first through hole and the first pressure relief mechanism are oppositely arranged; the battery device further comprises a first insulating part, and at least part of the first insulating part is arranged on the inner circumferential side of the first through hole. According to the technical scheme, the reliability of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and more particularly, to a battery device, an energy storage device, an energy storage system, and a charging network. Background Art

[0002] With the rapid development of technology, electric energy has become an indispensable energy source in people's production and life. In order to improve the smoothness of electric energy supply and ensure the normal operation of production and life, energy storage devices are needed. Energy storage devices can achieve the cyclic storage and release of electric energy. By charging or discharging the battery device of the energy storage device, electric energy can be stored in the energy storage device or the electric energy stored in the energy storage device can be supplied to the electrical device. Energy storage devices are widely used in industrial power supply, household power supply, temporary power supply, mobile power supply, wind power generation, solar power generation, and energy storage power stations and other fields.

[0003] In the development of energy storage devices, in addition to improving the endurance performance of energy storage devices, how to improve the reliability of battery devices is also an issue that cannot be ignored. Therefore, how to improve the reliability of battery devices is a technical problem that needs continuous improvement in energy storage technology. Summary of the Utility Model

[0004] Embodiments of this application provide a battery device, an energy storage device, an energy storage system, and a charging network, which can improve the reliability of the battery device.

[0005] In a first aspect, an embodiment of this application provides a battery device, including a box body, a first battery cell assembly, and a first insulating member; the box body includes a first beam body, and a first collection cavity is formed inside the first beam body; the first battery cell assembly is disposed inside the box body, the first battery cell assembly includes a plurality of first battery cells arranged along a first direction, the first beam body is located on one side of the first battery cell assembly along a second direction, and the first direction is perpendicular to the second direction; a first pressure relief mechanism is disposed on a side of the first battery cell facing the first beam body, a first through hole communicating with the first collection cavity is disposed on a side of the first beam body facing the first battery cell assembly, and the first through hole is disposed opposite to the first pressure relief mechanism; wherein, the battery device further includes a first insulating member, and the first insulating member is at least partially disposed on the inner peripheral side of the first through hole to insulate and isolate the hole wall of the first through hole and the first pressure relief mechanism when the pressure relief mechanism is opened.

[0006] In the above technical solution, by at least partially disposing the first insulating member on the inner peripheral side of the first through hole to insulate and isolate the hole wall of the first through hole and the first pressure relief mechanism when the first pressure relief mechanism is opened, the risk of short circuit between the first battery cell and the first beam body caused by the overlap between the first pressure relief mechanism and the hole wall of the first through hole when the first pressure relief mechanism is opened is reduced, thereby improving the reliability of the battery device.

[0007] In some embodiments, the first insulating member includes a first plate body and a first convex portion. Along the second direction, the first plate body is located between the first battery cell assembly and the first beam body, and the first plate body is provided with a second through hole communicating with the first through hole; the first convex portion protrudes from a side of the first plate body facing away from the first battery cell assembly, the first convex portion surrounds the second through hole, and at least a part of the first convex portion is disposed on the inner peripheral side of the first through hole.

[0008] In the above technical solution, by disposing the first plate body between the first battery cell assembly and the first beam body in the second direction, the risk of short circuit between the first battery cell and the first beam body is reduced; at the same time, by surrounding the second through hole with the first convex portion and disposing at least a part of the first convex portion on the inner peripheral side of the first through hole, when the pressure relief mechanism is opened, the hole wall of the first through hole and the first pressure relief mechanism are insulated from each other, thereby reducing the risk of short circuit between the first battery cell and the first beam body caused by the overlap between the first pressure relief mechanism and the hole wall of the first through hole when the first pressure relief mechanism is opened, and further improving the reliability of the battery device.

[0009] In some embodiments, along the second direction, the first beam body has a first side plate and a second side plate disposed opposite to each other, the first collection cavity is located between the first side plate and the second side plate, the first side plate is located between the first battery cell assembly and the second side plate, and the first side plate is provided with the first through hole.

[0010] In the above technical solution, by disposing the first collection cavity between the first side plate and the second side plate, when an external force is applied between the first side plate and the second side plate, the first collection cavity can give the first side plate and the second side plate a deformation space, thereby improving the buffering ability of the first beam body to the external force, and further improving the impact resistance of the battery device, and thus improving the reliability of the battery device.

[0011] In some embodiments, along the second direction, the first convex portion protrudes from a side of the first side plate facing away from the first battery cell assembly.

[0012] In the above technical solution, by protruding the first convex portion from a side of the first side plate facing away from the first battery cell assembly, the first convex portion extends from one end of the first through hole close to the first battery cell to the other end of the first through hole away from the first battery cell, thereby further reducing the risk of short circuit between the first battery cell and the first beam body caused by the overlap between the first pressure relief mechanism and the hole wall of the first through hole when the first pressure relief mechanism is opened, and further improving the reliability of the battery device.

[0013] In some embodiments, along the second direction, the orthographic projection of the first pressure relief mechanism on the first side plate falls into the first through hole.

[0014] In the above technical solution, the orthographic projection of the first pressure relief mechanism on the first side plate in the second direction falls into the first through hole. On the one hand, the first through hole has a relatively large cross-sectional area, facilitating the entry of electrolyte through the first through hole into the first collection chamber, thus facilitating the collection of electrolyte. On the other hand, the first through hole can be used for the first beam body to avoid the first pressure relief mechanism and provide a certain installation space for the first convex portion. Therefore, when the first battery cell undergoes thermal runaway and the first pressure relief mechanism is actuated, the risk of the first pressure relief mechanism not being able to open normally due to interference between the first convex portion and the first pressure relief mechanism is reduced, further enhancing the reliability of the battery device.

[0015] In some embodiments, the minimum distance between the orthographic projection of the first pressure relief mechanism on the first side plate and the hole wall of the first through hole is H1, and 1 mm ≤ H1 ≤ 2 mm is satisfied.

[0016] In the above technical solution, by H1 being greater than or equal to 1 mm, a certain installation space can be provided for the first convex portion, further reducing the risk of the first pressure relief mechanism not being able to open normally due to interference between the first convex portion and the first pressure relief mechanism. By H1 being greater than or equal to 2 mm, the influence of the first through hole on the structural strength of the first beam body is reduced, and the structural strength of the first beam body and the box body is enhanced, thereby enhancing the impact resistance of the battery device. Therefore, 1 mm ≤ H1 ≤ 2 mm reduces both the risk of the first pressure relief mechanism not being able to open normally due to interference between the first convex portion and the first pressure relief mechanism and enhances the impact resistance of the battery device, thus enhancing the reliability of the battery device.

[0017] In some embodiments, the first battery cell includes a first outer shell, the first outer shell has a first wall facing the first beam body, and the first pressure relief mechanism is disposed on the first wall; the first plate body is in contact with the first side plate and / or the first wall.

[0018] In the above technical solution, by making the first plate body in contact with the first side plate and / or the first wall, the first side plate and / or the first wall provide a supporting force to the first plate body, thereby reducing the inclination of the first plate body relative to the first side plate and / or the first wall. Especially when the first plate body is in contact with both the first side plate and the first wall simultaneously, the first side plate and the first wall can jointly limit the movement of the first plate body in the second direction, further reducing the risk of short circuit between the first battery cell and the first beam body.

[0019] In some embodiments, along the second direction, the orthographic projection of the first pressure relief mechanism on the first plate body falls into the second through hole.

[0020] In the above technical solution, the orthographic projection of the first pressure relief mechanism on the first plate body in the second direction falls into the second through hole. On the one hand, the second through hole has a relatively large cross-sectional area, facilitating the electrolysis to enter the first through hole through the second through hole. On the other hand, when the first pressure relief mechanism is opened, the second through hole can avoid the opened first pressure relief mechanism. Therefore, when the first battery cell undergoes thermal runaway and actuates the first pressure relief mechanism, the risk that the first pressure relief mechanism cannot be normally opened due to interference between the second through hole and the first pressure relief mechanism is reduced, further improving the reliability of the battery device.

[0021] In some embodiments, the minimum distance between the orthographic projection of the first pressure relief mechanism on the first plate body and the hole wall of the second through hole is H2, satisfying 0mm ≤ H2 ≤ 1mm.

[0022] In the above technical solution, by H2 being greater than or equal to 0mm, the risk that the first pressure relief mechanism cannot be normally opened due to interference between the second through hole and the first pressure relief mechanism is reduced. By H2 being greater than or equal to 1mm, the volume of the first convex portion arranged around the second through hole can be reduced, thereby reducing the aperture of the first through hole, further reducing the influence of the first through hole on the structural strength of the first beam body, improving the structural strength of the first beam body and the box body, and thus improving the impact resistance of the battery device. Therefore, 0mm ≤ H2 ≤ 1mm reduces both the risk that the first pressure relief mechanism cannot be normally opened due to interference between the first convex portion and the first pressure relief mechanism and improves the impact resistance of the battery device, thereby improving the reliability of the battery device.

[0023] In some embodiments, the first insulating member is a mica plate, a rigid foam, or a composite ceramic sheet.

[0024] In the above technical solution, by setting the first insulating member as a mica plate, a rigid foam, or a composite ceramic sheet, the first insulating member can have certain heat resistance. Therefore, when the first battery cell undergoes thermal runaway, the risk that the first outer shell and the first pressure relief mechanism melt the first insulating member and cause a short circuit between the first battery cell and the first beam body is reduced, further improving the reliability of the battery device.

[0025] In some embodiments, the first insulating member is an insulating coating, and at least a part of the insulating coating is coated on the hole wall of the first through hole.

[0026] In the above technical solution, by setting the first insulating member as an insulating coating and coating the insulating coating on the hole wall of the first through hole to insulate and isolate the hole wall of the first through hole and the first pressure relief mechanism when the pressure relief mechanism is opened, the structure is simple and easy to implement.

[0027] In some embodiments, the insulating coating includes a first portion and a second portion. The first portion is coated on one side of the first beam facing the first battery cell assembly, and the second portion is coated on the inner wall of the first through hole.

[0028] In the above technical solution, by coating the first portion on one side of the first beam facing the first battery cell assembly, the risk of short circuit between the first battery cell and the first beam is reduced; at the same time, by coating the second portion on the inner wall of the first through hole, when the pressure relief mechanism is opened, the inner wall of the first through hole and the first pressure relief mechanism are insulated from each other, thereby reducing the risk of short circuit between the first battery cell and the first beam caused by the overlap between the first pressure relief mechanism and the inner wall of the first through hole when the first pressure relief mechanism is opened, and further improving the reliability of the battery device.

[0029] In some embodiments, the battery device further includes a second battery cell assembly and a second insulating member; the second battery cell assembly is disposed in the box body. The second battery cell assembly includes a plurality of second battery cells arranged along the first direction. Along the second direction, the first beam is located between the first battery cell assembly and the second battery cell assembly; a second pressure relief mechanism is disposed on one side of the second battery cell facing the first beam, and a third through hole communicating with the first collection cavity is disposed on one side of the first beam facing the second battery cell assembly. The third through hole is disposed opposite to the second pressure relief mechanism; wherein, the battery device further includes a second insulating member, and at least a part of the second insulating member is disposed on the inner peripheral side of the third through hole to insulate the inner wall of the third through hole and the pressure relief mechanism when the pressure relief mechanism is opened.

[0030] In the above technical solution, by disposing at least a part of the second insulating member on the inner peripheral side of the third through hole, when the second pressure relief mechanism is opened, the inner wall of the third through hole and the second pressure relief mechanism are insulated from each other, thereby reducing the risk of short circuit between the second battery cell and the first beam caused by the overlap between the second pressure relief mechanism and the inner wall of the third through hole when the second pressure relief mechanism is opened, and further improving the reliability of the battery device.

[0031] In some embodiments, the box body further includes a bottom wall and two second beams; the bottom wall bears the first battery cell assembly and the second battery cell assembly along the direction of gravity; the two second beams are spaced apart along the first direction; wherein, both the first battery cell assembly and the second battery cell assembly are disposed between the two second beams, and two ends of the first beam in the first direction are respectively connected to the two second beams.

[0032] In the above technical solution, by providing two second beam bodies spaced along the first direction, and arranging both the first battery cell assembly and the second battery cell assembly between the two second beam bodies, when the battery device is subjected to an external force impact along the first direction, the two second beam bodies can buffer the impact force, reducing the risk of damage to the first battery cell assembly and the second battery cell assembly, and improving the impact resistance of the battery device.

[0033] In some embodiments, the interior of the second beam body has a second collection cavity, and the first collection cavity is in communication with the second collection cavity.

[0034] In the above technical solution, by providing a second collection cavity inside the second beam body and making the first collection cavity communicate with the second collection cavity, on the one hand, the first collection cavity can cooperate with the second collection cavity to accommodate more electrolyte, thus facilitating the collection of the electrolyte; on the other hand, the second collection cavity can give the second beam body space for deformation, thereby further improving the buffer capacity of the second beam body against external forces in the first direction, and further improving the impact resistance of the battery device, thereby improving the reliability of the battery device and the energy storage device provided with the battery device.

[0035] In a second aspect, an embodiment of the present application provides an energy storage device, including the battery device provided in any of the embodiments of the first aspect.

[0036] In a third aspect, an embodiment of the present application provides an energy storage system, including an energy storage converter device and the energy storage device provided in the embodiment of the second aspect; the energy storage converter device is used to electrically connect a power generation device and the energy storage device.

[0037] In a fourth aspect, an embodiment of the present application provides a charging network, including a charging pile and the energy storage device provided in the embodiment of the second aspect; the energy storage device is used to provide electric energy for the charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0039] Figure 1 It is a schematic structural diagram of a charging network provided by some embodiments of the present application;

[0040] Figure 2 It is a schematic structural diagram of an energy storage system provided by some embodiments of the present application;

[0041] Figure 3A schematic diagram of the structure of an energy storage device provided in some embodiments of the present application;

[0042] Figure 4 An exploded view of the structure of a battery device provided in some embodiments of the present application;

[0043] Figure 5 A schematic structural diagram of another battery device provided in some embodiments of the present application;

[0044] Figure 6 An exploded view of the structure of a first battery cell provided in some embodiments of the present application;

[0045] Figure 7 for Figure 5 Cross-sectional view of AA;

[0046] Figure 8 for Figure 7 Enlarged view of point B in the middle;

[0047] Figure 9 A schematic structural diagram of a first insulating member provided in some embodiments of the present application;

[0048] Figure 10 A cross-sectional view of another battery device provided in some embodiments of the present application in another direction;

[0049] Figure 11 A schematic structural diagram of a first beam provided in some embodiments of the present application;

[0050] Figure 12 A schematic structural diagram of another battery device provided in some embodiments of the present application;

[0051] Figure 13 An exploded view of the structure of a second battery cell provided in some embodiments of the present application;

[0052] Figure 14 for Figure 12 Partial cross-sectional view of CC.

[0053] Icons: 1000 - Charging network; 2000 - Energy storage system; 3000 - Power generation device; 100 - Battery device; 10 - Box body; 11 - First box body; 111 - Bottom wall; 12 - Second box body; 13 - First beam body; 13A - First collection cavity; 13B - First through hole; 13C - Third through hole; 131 - First side plate; 132 - Second side plate; 133 - Connection part; 14 - Second beam body; 14A - Second collection cavity; 15 - Connector; 20 - First battery cell assembly; 21 - First battery cell; 211 - First outer shell; 2111 - First wall; 211A - First housing; 211B - First cover plate; 212 - First pressure relief mechanism; 213 - First electrode assembly; 30 - Second battery cell assembly; 31 - Second battery cell; 311 - Second outer shell; 3111 - Second wall; 311A - Second housing; 311B - Second cover plate; 312 - Second pressure relief mechanism; 313 - Second electrode assembly; 40 - First insulating part; 41 - First plate body; 41A - Second through hole; 42 - First convex part; 50 - Second insulating part; 51 - Second plate body; 51A - Fourth through hole; 52 - Second convex part; 200 - Energy storage device; 210 - Energy storage box body; 300 - Charging pile; 400 - Energy storage inverter device; X - First direction; Y - Second direction; Z - Gravity direction. Detailed implementation manners

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0055] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0056] References to "embodiments" in this application mean that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "attached" shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] The term "and / or" in this application is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0059] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, and other dimensions of various components shown in the drawings in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device, are only illustrative and should not constitute any limitation to this application.

[0060] The term "a plurality of" as used in this application means two or more (including two).

[0061] The battery device (Battery Apparatus) mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0062] In some embodiments, the battery cell assembly (Battery Cell Assembly) is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells with cable ties.

[0063] In some embodiments, the battery device may be a battery pack, which includes a box body and one or more battery cell assemblies accommodated in the box body.

[0064] As an example, the battery cell assembly may be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0065] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0066] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. Here, "closed" means covered or closed, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0067] As an example, the box body may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0068] In some embodiments, the energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0069] In this application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and the embodiments of this application are not limited thereto. The battery can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, etc., and the embodiments of this application are also not limited thereto.

[0070] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0071] Optionally, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0072] Optionally, the electrode assembly is a stacked structure.

[0073] Optionally, the shape of the electrode assembly can be cylindrical, flat, or multi-prismatic, etc.

[0074] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. An energy storage power station can store electrical energy during low electricity consumption periods and supply electrical energy to relevant users or electrical equipment during peak electricity consumption periods. After the wind energy collected by the wind turbines in a wind power generation system is converted into electrical energy, it is stored by the energy storage device. A solar power generation system can convert solar energy into electrical energy, which is then stored by the energy storage device and supplied to users at the right time. A mobile power system can supply power to relevant electrical equipment in places where the grid power supply system cannot reach, such as remote mountainous areas and remote wilderness areas. A temporary power supply system can supply power to users in the case of insufficient power supply. The energy storage system provided in the embodiments of the present application can be any power system that requires the use of an energy storage device.

[0075] In order to ensure the use safety of the battery cells in the battery device, a pressure relief structure is usually provided on the outer shell of the battery cell to release the internal pressure of the battery cell through the pressure relief structure, thereby effectively improving the use safety of the battery cell. In order to facilitate the collection of the electrolyte in the battery cell, the fragments of the positive and negative electrode plates that are dissolved or split, the fragments of the separator, and the high-temperature and high-pressure gas generated by the reaction when the pressure relief mechanism is opened, a collection cavity is provided in the beam body of the pressure relief mechanism close to the battery cell, and through holes communicating with the collection cavity and corresponding to the pressure relief mechanism are provided, so that the emissions discharged by the pressure relief mechanism can be collected by the collection cavity through the through holes. Since there is a large pressure inside the battery cell when the pressure relief mechanism is opened, part of the pressure relief mechanism will turn outwards, so there is a risk of short circuit between the battery cell and the beam body due to the contact between the pressure relief mechanism and the hole wall of the through hole when the pressure relief mechanism is opened.

[0076] Based on the above considerations, in order to improve the reliability of the battery device, the embodiments of the present application provide a battery device, which includes a box body, a first battery cell assembly, and a first insulating member; the box body includes a first beam body, and a first collection cavity is provided inside the first beam body; the first battery cell assembly is arranged in the box body, the first battery cell assembly includes a plurality of first battery cells arranged along a first direction, the first beam body is located on one side of the first battery cell assembly along a second direction, and the first direction is perpendicular to the second direction; a first pressure relief mechanism is provided on the side of the first battery cell facing the first beam body, and a first through hole communicating with the first collection cavity is provided on the side of the first beam body facing the first battery cell assembly, and the first through hole is arranged opposite to the first pressure relief mechanism; wherein, the battery device further includes a first insulating member, and the first insulating member is at least partially arranged on the inner peripheral side of the first through hole to insulate and isolate the hole wall of the first through hole and the first pressure relief mechanism when the pressure relief mechanism is opened.

[0077] In the battery device with such a structure, by disposing the first insulating member at least partially on the inner peripheral side of the first through hole, when the first pressure relief mechanism is opened, the hole wall of the first through hole and the first pressure relief mechanism are insulated from each other, thereby reducing the risk of short circuit between the first battery cell and the first beam caused by the overlap of the first pressure relief mechanism and the hole wall of the first through hole when the first pressure relief mechanism is opened, and further improving the reliability of the battery device.

[0078] The battery device 100 will be described below with reference to the accompanying drawings.

[0079] Please refer to Figure 1 and Figure 3 , Figure 1 which is a schematic structural diagram of a charging network 1000 provided by some embodiments of the present application, Figure 3 and which is a schematic structural diagram of an energy storage device 200 provided by some embodiments of the present application. Some embodiments of the present application provide a charging network 1000. The charging network 1000 includes a charging pile 300 for charging an electrical device. The charging network 1000 may further include an energy storage device 200 electrically connected to the charging pile 300, and the energy storage device 200 is used to supply electrical energy to the charging pile 300.

[0080] It should be noted that the battery cells in the charging pile 300 and the energy storage device 200 are electrically connected by a cable, and the battery cells can supply the electrical energy stored in themselves to the charging pile 300. The charging pile 300 has a connector that can be connected to the electrical device, so as to supply energy to the electrical device. By applying the energy storage device 200, the charging network 1000 can effectively improve the safety of the charging network 1000 and also help to improve the flexibility of the charging network 1000 during deployment.

[0081] In a charging network 1000, there may be one charging pile 300, and the energy storage device 200 supplies electrical energy to one charging pile 300; there may also be multiple charging piles 300, and the energy storage device 200 supplies electrical energy to multiple charging piles 300.

[0082] As an example, as Figure 1 shown, the charging network 1000 includes one energy storage device 200 and two charging piles 300, and one energy storage device 200 supplies electrical energy to two charging piles 300.

[0083] The energy storage device 200 may include a battery device 100, and the battery device 100 is electrically connected to the charging pile 300 to facilitate the battery device 100 to supply electrical energy to the charging pile 300.

[0084] Please refer to Figure 2 and Figure 3 , Figure 2Schematic structural diagram of the energy storage system 2000 provided by some embodiments of the present application. Some embodiments of the present application provide an energy storage system 2000. The energy storage system 2000 includes an energy storage converter device 400, and the energy storage converter device 400 can be electrically connected to the power generation device 3000 to convert the power provided by the power generation device 3000. The energy storage system 2000 may further include an energy storage device 200, and the energy storage device 200 is electrically connected to the energy storage converter device 400. The energy storage converter device 400 converts the electric energy provided by the power generation device 3000 through power conversion and then imports it into the energy storage device 200 for storage.

[0085] The power conversion device is used to be connected between the power generation device 3000 and the energy storage device 200. The power generation device 3000 is used to generate electric energy, and the power generation device 3000 is used to store the electric energy generated by it into the energy storage device 200 through the power conversion device. The energy storage system 2000 applies the energy storage device 200, which can effectively improve the operation safety of the energy storage system 2000. In specific implementation, the power generation equipment may specifically be a solar panel, a hydroelectric power generation equipment, a thermal power generation equipment, etc. Among them, the specific type of the power generation equipment is not limited in the present application.

[0086] As an example, as Figure 2 shown, the energy storage system 2000 includes an energy storage device 200 and an energy storage converter device 400. Two power generation devices 3000 respectively transmit the generated electric energy to the energy storage converter device 4, and the energy storage converter device 400 imports the electric energy into the energy storage device 200 for storage.

[0087] Please refer to Figure 3 , the energy storage device 200 includes an energy storage box body 210, and a battery device 100 is arranged in the energy storage box body 210.

[0088] Please refer to Figures 4 - 8 , Figure 4 Exploded view of the structure of the battery device 100 provided by some embodiments of the present application, Figure 5 Another schematic structural diagram of the battery device 100 provided by some embodiments of the present application, Figure 6 Exploded view of the structure of the first battery cell 21 provided by some embodiments of the present application, Figure 7 For Figure 5 the sectional view taken along A-A in Figure 8 For Figure 7An enlarged view of part B in the figure. An embodiment of the present application provides a battery device 100, which includes a box body 10, a first battery cell assembly 20, and a first insulating member 40; the box body 10 includes a first beam body 13, and the interior of the first beam body 13 has a first collection cavity 13A; the first battery cell assembly 20 is disposed within the box body 10, the first battery cell assembly 20 includes a plurality of first battery cells 21 arranged along a first direction X, the first beam body 13 is located on one side of the first battery cell assembly 20 along a second direction Y, and the first direction X is perpendicular to the second direction Y; a first pressure relief mechanism 212 is disposed on a side of the first battery cell 21 facing the first beam body 13, a first through hole 13B communicating with the first collection cavity 13A is disposed on a side of the first beam body 13 facing the first battery cell assembly 20, and the first through hole 13B is disposed opposite to the first pressure relief mechanism 212; wherein, the battery device 100 further includes a first insulating member 40, and the first insulating member 40 is at least partially disposed on the inner circumferential side of the first through hole 13B to insulate and isolate the hole wall of the first through hole 13B and the first pressure relief mechanism 212 when the pressure relief mechanism is opened.

[0089] The box body 10 is used to provide an assembly space for the battery cells, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 are covered with each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells. The second box body 12 may be a hollow structure with one end open, the first box body 11 may be a plate-like structure, and the first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 may also both be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0090] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as, a cylinder, a cuboid, or a cube, etc. Exemplarily, in Figure 2 the box body 10 is in the shape of a cuboid.

[0091] In the battery device 100, the number of battery cells disposed within the box body 10 may be one or multiple. When there are multiple battery cells disposed within the box body 10, the multiple battery cells may be connected in series, in parallel, or in a mixed connection, and a mixed connection means that there are both series and parallel connections among the multiple battery cells. The multiple battery cells may be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells is accommodated within the box body 10; of course, the battery device 100 may also be that multiple battery cells are first connected in series, in parallel, or in a mixed connection to form a battery cell assembly form, and then multiple battery cell assemblies are connected in series, in parallel, or in a mixed connection to form a whole, and the whole is accommodated within the box body 10.

[0092] In some embodiments, the battery device 100 may further include other structures. For example, the battery device 100 may further include a bus bar for connecting a plurality of battery cells to achieve electrical connection between the plurality of battery cells.

[0093] Wherein, each battery cell may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell may be in a cuboid shape, a cylindrical shape, a prismatic shape or other shapes, etc. Exemplarily, in Figure 3 and Figure 4 the battery cell is in a cuboid structure.

[0094] The first beam body 13 is a structural beam extending in the horizontal direction in the box body 10.

[0095] In some embodiments, the first beam body 13 may be a frame structure provided around the edge of the bottom wall 111 of the box body 10.

[0096] The first collection cavity 13A is a cavity structure in the first beam body 13 for accommodating the electrolyte. Exemplarily, the first collection cavity 13A may be directly communicated with the outside of the box body 10, or may be indirectly communicated with the outside of the box body 10 through other structures (such as flow channels, through holes, etc.).

[0097] In some embodiments, a cavity is provided in the first beam body 13, and the first collection cavity 13A is this cavity.

[0098] In some embodiments, a plurality of independent cavities are provided in the first beam body 13, and the first collection cavity 13A is one of the cavities.

[0099] In some embodiments, the battery device 100 includes a plurality of battery cell assemblies, and the first beam body 13 is a partition beam located between two adjacent battery cell assemblies for separating the two adjacent battery cell assemblies.

[0100] The first battery cell assembly 20 is an assembly composed of a plurality of first battery cells 21 connected in series, in parallel or in a hybrid connection.

[0101] The first direction X and the second direction Y are two mutually perpendicular horizontal directions. Exemplarily, the first direction X may be parallel to the width direction of the battery device 100, and the second direction Y may be parallel to the length direction of the battery device 100; or, the first direction X may be parallel to the length direction of the battery device 100, and the second direction Y may be parallel to the width direction of the battery device 100.

[0102] A pressure relief mechanism refers to an element or component that actuates to release internal pressure or temperature when the internal pressure or temperature or other conditions of a battery cell reach a predetermined threshold. This threshold design varies according to different design requirements. The threshold may depend on the materials of one or several of the positive electrode plate, negative electrode plate, electrolyte, and separator in the battery cell. The pressure relief mechanism can take forms such as an explosion-proof valve, air valve, pressure relief valve, or safety valve, and can specifically adopt pressure-sensitive or temperature-sensitive elements or structures, that is, when the internal pressure or temperature or other conditions of the battery cell reach a predetermined threshold, the first pressure relief mechanism 212 performs an action or a weak structure provided in the pressure relief mechanism is damaged, thereby forming an opening or channel for the release of internal pressure or temperature.

[0103] In the embodiments of the present application, the "actuation" mentioned refers to the pressure relief mechanism generating an action or being activated to a certain state, so that the internal pressure and temperature of the battery cell can be released. The actions generated by the pressure relief mechanism can include, but are not limited to: at least a part of the pressure relief mechanism rupturing, breaking, melting, being torn, or opening, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged outward from the actuated part as emissions. In this way, the battery cell can be pressure-relieved and temperature-relieved under controlled pressure or temperature, thereby avoiding potential more serious accidents.

[0104] In some embodiments, please refer to Figure 6 , the first battery cell 21 includes a first housing 211, a first electrode assembly 213, and a first pressure relief mechanism 212. The first electrode assembly 213 is accommodated in the first housing 211. The first housing 211 has a first wall 2111 facing the first beam body 13, and the first pressure relief mechanism 212 is disposed on the first wall 2111.

[0105] The first housing 211 is a shell-like component for accommodating other structural components (such as the first electrode assembly 213) of the first battery cell 21. The first housing 211 can also be used to accommodate an electrolyte, such as an electrolyte solution. In some embodiments, an accommodation cavity is formed inside the first housing 211 for accommodating the first electrode assembly 213.

[0106] In some embodiments, the material of the first housing 211 can be metal or a combination of metal and non-metal. For example, the first housing 211 can be made of metal, such as aluminum, copper, iron, aluminum, steel, or aluminum alloy, etc.; or for another example, part of the first housing 211 can be made of metal, and the remaining part can be made of non-metal. For example, the first wall 2111 can be made of metal, and other parts of the first housing 211 can be made of non-metal materials.

[0107] The first wall 2111 is the wall portion of the first outer shell 211 facing the first beam body 13. Exemplarily, the thickness direction of the first wall 2111 may be parallel to the second direction Y.

[0108] In some embodiments, the first outer shell 211 includes a first housing 211A and a first cover plate 211B. The first housing 211A has an opening, and the first cover plate 211B seals the opening; the first wall 2111 is the first cover plate 211B or the first wall 2111 is the wall portion of the first housing 211A opposite to the first cover plate 211B.

[0109] The first electrode assembly 213 is the component in the first battery cell 21 where an electrochemical reaction occurs.

[0110] The structure of the first electrode assembly 213 can be various. Exemplarily, the first electrode assembly 213 can be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet. Exemplarily, the separator is a separator film, and the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0111] In the embodiment where the first electrode assembly 213 is a wound structure, the second direction Y can be parallel to the winding axis of the first electrode assembly 213.

[0112] Exemplarily, one first electrode assembly 213 or multiple first electrode assemblies 213 can be accommodated in the first outer shell 211, and the multiple first electrode assemblies 213 are arranged along the first direction X.

[0113] The first through hole 13B is a through hole provided on the side of the first beam body 13 facing the first battery cell assembly 20 for allowing the electrolyte to enter the first collection cavity 13A. Exemplarily, the first through hole 13B can be integrally formed with the first beam body 13 by stamping, extrusion, etc., or can be formed on the first beam body 13 by turning and milling.

[0114] In some embodiments, one first pressure relief mechanism 212 corresponds to multiple first through holes 13B. Along the second direction Y, the orthographic projection of the first pressure relief mechanism 212 covers the multiple first through holes 13B corresponding to it.

[0115] In some embodiments, one first pressure relief mechanism 212 corresponds to one first through hole 13B. Along the second direction Y, the orthographic projection of the first pressure relief mechanism 212 covers the one first through hole 13B corresponding to it.

[0116] The first insulating member 40 is a component for insulating and isolating the hole wall of the first through hole 13B and the first pressure relief mechanism 212. Exemplarily, the first insulating member 40 can be insulating glue, an insulating coating, or an insulating structural member.

[0117] In some embodiments, the first insulating member 40 is annular, and the first insulating member 40 is disposed in the first through hole 13B and coaxially with the first through hole 13B.

[0118] In some embodiments, a plurality of first insulating members 40 are arranged at intervals along the inner circumferential direction of the first through hole 13B.

[0119] Specifically, when the first pressure relief mechanism 212 is opened, a part of the first pressure relief mechanism 212 is folded inward into the first through hole 13B to abut against the first insulating member 40.

[0120] In this embodiment, by disposing at least a part of the first insulating member 40 on the inner circumferential side of the first through hole 13B, when the first pressure relief mechanism 212 is opened, the hole wall of the first through hole 13B and the first pressure relief mechanism 212 are insulated from each other, thereby reducing the risk of short circuit between the first battery cell 21 and the first beam body 13 caused by the overlap between the first pressure relief mechanism 212 and the hole wall of the first through hole 13B when the first pressure relief mechanism 212 is opened, and further improving the reliability of the battery device 100.

[0121] Please refer to Figure 7 and Figure 8 and please refer to Figure 9 and Figure 10 , Figure 9 is a schematic structural diagram of the first insulating member 40 provided in some embodiments of the present application, Figure 10 is a cross-sectional view of another battery device 100 provided in some embodiments of the present application in another direction. According to some embodiments of the present application, the first insulating member 40 includes a first plate body 41 and a first convex portion 42. Along the second direction Y, the first plate body 41 is located between the first battery cell assembly 20 and the first beam body 13, and the first plate body 41 is provided with a second through hole 41A communicating with the first through hole 13B; the first convex portion 42 protrudes from the side of the first plate body 41 facing away from the first battery cell assembly 20, the first convex portion 42 surrounds the second through hole 41A, and at least a part of the first convex portion 42 is disposed on the inner circumferential side of the first through hole 13B.

[0122] The first plate body 41 is the part of the first insulating member 40 that insulates and isolates the first beam body 13 and the first battery cell 21, and the first convex portion 42 is the part of the first insulating member 40 that is used to insulate and isolate the first pressure relief mechanism 212 and the hole wall of the first through hole 13B when the first pressure relief mechanism 212 is opened.

[0123] In some embodiments, in a plane perpendicular to the second direction Y, the orthographic projection of the first plate body 41 covers the orthographic projection of the first battery cell assembly 20.

[0124] It can be understood that the first convex portion 42 is an annular structure surrounding the second through hole 41A, and the inside of the first convex portion 42 communicates with the second through hole 41A.

[0125] In some embodiments, the outer side of the first convex portion 42 abuts against the hole wall of the first through hole 13B; in some embodiments, there is a gap between the outer side of the first convex portion 42 and the hole wall of the first through hole 13B.

[0126] In some embodiments, the first convex portion 42 is formed on the first plate body 41 by stamping or extrusion.

[0127] Exemplarily, the thickness direction of the first plate body 41 is parallel to the first direction X, and the first plate body 41 can be disposed on the outer surface of the first side plate 131.

[0128] In some embodiments, at least a part of the first plate body 41 is adhered to the side of the first side plate 131 facing the first battery cell assembly 20.

[0129] In some embodiments, the edge of the first plate body 41 in the gravity direction Z is adhered to the bottom wall 111.

[0130] In this embodiment, by disposing the first plate body 41 between the first battery cell assembly 20 and the first beam body 13 in the second direction Y, the risk of short circuit between the first battery cell 21 and the first beam body 13 is reduced; at the same time, by disposing the first convex portion 42 around the second through hole 41A, at least a part of the first convex portion 42 is disposed on the inner peripheral side of the first through hole 13B, so as to insulate and isolate the hole wall of the first through hole 13B and the first pressure relief mechanism 212 when the pressure relief mechanism is opened, thereby reducing the risk of short circuit between the first battery cell 21 and the first beam body 13 caused by the overlap between the hole wall of the first through hole 13B and the first pressure relief mechanism 212 when the first pressure relief mechanism 212 is opened, and further improving the reliability of the battery device 100.

[0131] Please refer to Figure 7 and Figure 8 and please refer to Figure 9 and Figure 10 According to some embodiments of the present application, along the second direction Y, the first beam body 13 has a first side plate 131 and a second side plate 132 disposed opposite to each other, the first collection cavity 13A is located between the first side plate 131 and the second side plate 132, the first side plate 131 is located between the first battery cell assembly 20 and the second side plate 132, and the first side plate 131 is provided with a first through hole 13B.

[0132] The first side plate 131 and the second side plate 132 are two wall portions of the first beam body 13 disposed opposite to each other in the second direction Y. Exemplarily, the thickness directions of both the first side plate 131 and the second side plate 132 are parallel to the second direction Y.

[0133] In some embodiments, the first beam 13 further has connecting portions 133. There are two connecting portions 133, and the two connecting portions 133 are respectively connected to two ends of the first side plate 131 and the second side plate 132 that are oppositely arranged in the gravity direction Z. The first side plate 131, the second side plate 132, and the two connecting portions 133 enclose to form a first collection cavity 13A.

[0134] In some embodiments, please refer to Figure 8 , the first beam 13 further has connecting portions 133. There are multiple connecting portions 133. The connecting portions 133 located at two opposite ends in the gravity direction Z are respectively connected to two ends of the first side plate 131 and the second side plate 132 that are oppositely arranged in the gravity direction Z. The first side plate 131, the second side plate 132, and two adjacent connecting portions 133 enclose to form a first collection cavity 13A.

[0135] Exemplarily, the end of the first convex portion 42 facing away from the first plate body 41 is flush with the inner surface of the first side plate 131, or the inner surface of the first side plate 131 protrudes from the end of the first convex portion 42 facing away from the first plate body 41, or the end of the first convex portion 42 facing away from the first plate body 41 protrudes from the inner surface of the first side plate 131.

[0136] In this embodiment, by arranging the first collection cavity 13A between the first side plate 131 and the second side plate 132, when an external force is applied between the first side plate 131 and the second side plate 132, the first collection cavity 13A can give the first side plate 131 and the second side plate 132 a deformation space, thereby enhancing the buffering ability of the first beam 13 against external forces, and further enhancing the impact resistance of the battery device 100, thereby enhancing the reliability of the battery device 100.

[0137] Please refer to Figure 8 , and please refer to Figure 10 , according to some embodiments of the present application, along the second direction Y, the first convex portion 42 protrudes from the side of the first side plate 131 facing away from the first battery cell assembly 20.

[0138] It can be understood that along the second direction Y, the first convex portion 42 protrudes from the side of the first side plate 131 facing away from the first battery cell assembly 20, that is, the first convex portion 42 extends from the end of the first through hole 13B close to the first battery cell 21 to the end of the first through hole 13B far from the first battery cell 21.

[0139] In this embodiment, by protruding the first convex portion 42 from the side of the first side plate 131 facing away from the first battery cell assembly 20, the first convex portion 42 extends from one end of the first through hole 13B close to the first battery cell 21 to the other end of the first through hole 13B away from the first battery cell 21. Thereby, the risk of short circuit between the first battery cell 21 and the first beam body 13 caused by the overlap between the first pressure relief mechanism 212 and the hole wall of the first through hole 13B when the first pressure relief mechanism 212 is opened is further reduced, thereby further improving the reliability of the battery device 100.

[0140] Please refer to Figure 11 , Figure 11 , which is a schematic structural diagram of the first beam body 13 provided by some embodiments of the present application. According to some embodiments of the present application, along the second direction Y, the orthographic projection of the first pressure relief mechanism 212 on the first side plate 131 falls within the first through hole 13B.

[0141] Please refer to Figure 11 , in order to better show the range of the orthographic projection of the first pressure relief mechanism 212, the range of the orthographic projection of the first pressure relief mechanism 212 is shown by a dotted line in the figure. It should be noted that the dotted line is only used to show the range of the orthographic projection of the first pressure relief mechanism 212, and the dotted line itself has no other meaning.

[0142] In some embodiments, the edge of the orthographic projection of the first pressure relief mechanism 212 on the first side plate 131 overlaps with the edge of the first through hole 13B.

[0143] In this embodiment, by making the orthographic projection of the first pressure relief mechanism 212 on the first side plate 131 along the second direction Y fall within the first through hole 13B; on the one hand, the first through hole 13B has a relatively large cross-sectional area, which is convenient for electrolysis to enter the first collection chamber 13A through the first through hole 13B, thus facilitating the collection of the electrolyte; on the other hand, the first through hole 13B can be used for the first beam body 13 to avoid the first pressure relief mechanism 212 and give a certain installation space to the first convex portion 42. Thereby, when the first battery cell 21 undergoes thermal runaway and causes the first pressure relief mechanism 212 to actuate, the risk that the first pressure relief mechanism 212 cannot be normally opened due to interference between the first convex portion 42 and the first pressure relief mechanism 212 is reduced, thereby further improving the reliability of the battery device 100.

[0144] Please refer to Figure 11 , according to some embodiments of the present application, the minimum distance between the orthographic projection of the first pressure relief mechanism 212 on the first side plate 131 and the hole wall of the first through hole 13B is H1, satisfying 1 mm ≤ H1 ≤ 2 mm.

[0145] The minimum distance between the orthographic projection on the first side plate 131 and the pore wall of the first through hole 13B refers to the length of the line segment between any point on the edge of the orthographic projection of the first pressure relief mechanism 212 on the first side plate 131 and the point on the pore wall of the first through hole 13B that is the closest to this point.

[0146] On the edge of the orthographic projection of the first pressure relief mechanism 212 on the first side plate 131, there are a first point and a second point. The minimum distance between the first point and the point on the pore wall of the first through hole 13B that is the closest to the first point can be equal to the minimum distance between the second point and the point on the pore wall of the first through hole 13B that is the closest to the second point, or can be unequal to the minimum distance between the second point and the point on the pore wall of the first through hole 13B that is the closest to the second point.

[0147] Exemplarily, H1 can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc.

[0148] In this embodiment, by making H1 greater than or equal to 1mm, a certain installation space can be given to the first convex portion 42, thereby further reducing the risk that the first pressure relief mechanism 212 cannot be normally opened due to interference between the first convex portion 42 and the first pressure relief mechanism 212; by making H1 greater than or equal to 2mm, the influence of the first through hole 13B on the structural strength of the first beam body 13 is reduced, the structural strength of the first beam body 13 and the box body 10 is improved, and thus the impact resistance of the battery device 100 is improved. Therefore, 1mm ≤ H1 ≤ 2mm, which not only reduces the risk that the first pressure relief mechanism 212 cannot be normally opened due to interference between the first convex portion 42 and the first pressure relief mechanism 212, but also improves the impact resistance of the battery device 100, thereby improving the reliability of the battery device 100.

[0149] Please refer to Figure 8 and please refer to Figure 10 According to some embodiments of the present application, the first battery cell 21 includes a first outer shell 211. The first outer shell 211 has a first wall 2111 facing the first beam body 13, and the first pressure relief mechanism 212 is arranged on the first wall 2111; the first plate body 41 is in contact with the first side plate 131 and / or the first wall 2111.

[0150] The first plate body 41 being in contact with the first side plate 131 and / or the first wall 2111 can be understood as that the first plate body 41 and the first side plate 131 and / or the first wall 2111 are in contact to provide extrusion force to each other; it can also be understood as that the first plate body 41 and the first side plate 131 and / or the first wall 2111 are in contact but do not provide extrusion force to each other.

[0151] Exemplarily, the first plate body 41 can be directly abutted against the first side plate 131 and / or the first wall 2111, or can be indirectly abutted through structural members such as buffer members. The first plate body 41 and the first side plate 131 and / or the first wall 2111 provide extrusion forces to each other; the first plate body 41 and the first side plate 131 and / or the first wall 2111 can be in direct contact or can be in indirect contact through structural members such as buffer members, that is, the first plate body 41 and the first side plate 131 and / or the first wall 2111 do not provide extrusion forces to each other.

[0152] In some embodiments, the first plate body 41 is clamped between the first side plate 131 and the first wall 2111.

[0153] In some embodiments, one side of the first plate body 41 facing the first side plate 131 is bonded to the first side plate 131, and one side of the first plate body 41 facing the first wall 2111 is bonded to the first wall 2111.

[0154] In this embodiment, by bringing the first plate body 41 into contact with the first side plate 131 and / or the first wall 2111, the first side plate 131 and / or the first wall 2111 provide a supporting force to the first plate body 41, thereby reducing the inclination of the first plate body 41 relative to the first side plate 131 and / or the first wall 2111. Especially when the first plate body 41 is in contact with both the first side plate 131 and the first wall 2111 at the same time, the first side plate 131 and the first wall 2111 can jointly limit the movement of the first plate body 41 along the second direction Y, thereby further reducing the risk of short circuit between the first battery cell 21 and the first beam body 13.

[0155] Please refer to Figure 9 , according to some embodiments of the present application, along the second direction Y, the orthographic projection of the first pressure relief mechanism 212 on the first plate body 41 falls within the second through hole 41A.

[0156] Please refer to Figure 9 , in order to better show the range of the orthographic projection of the first pressure relief mechanism 212, the range of the orthographic projection of the first pressure relief mechanism 212 is shown in the figure in the form of a dotted line. It should be noted that the dotted line is only used to show the range of the orthographic projection of the first pressure relief mechanism 212, and the dotted line itself has no other meaning.

[0157] In some embodiments, the edge of the orthographic projection of the first pressure relief mechanism 212 on the first plate body 41 overlaps with the edge of the second through hole 41A.

[0158] In this embodiment, by making the orthographic projection of the first pressure relief mechanism 212 in the second direction Y on the first plate body 41 fall within the second through hole 41A; on the one hand, the second through hole 41A has a relatively large cross-sectional area, facilitating the entry of electrolyte into the first through hole 13B through the second through hole 41A; on the other hand, when the first pressure relief mechanism 212 is opened, the second through hole 41A can avoid the opened first pressure relief mechanism 212. Thus, when the first battery cell 21 actuates the first pressure relief mechanism 212 due to thermal runaway, the risk that the first pressure relief mechanism 212 cannot be opened normally due to interference between the second through hole 41A and the first pressure relief mechanism 212 is reduced, further enhancing the reliability of the battery device 100.

[0159] Please refer to Figure 9 , according to some embodiments of the present application, the minimum distance between the orthographic projection of the first pressure relief mechanism 212 on the first plate body 41 and the hole wall of the second through hole 41A is H2, satisfying 0 mm ≤ H2 ≤ 1 mm.

[0160] The minimum distance between the orthographic projection of the first pressure relief mechanism 212 on the first plate body 41 and the hole wall of the second through hole 41A refers to the length of the line segment between any point on the edge of the orthographic projection of the first pressure relief mechanism 212 on the first plate body 41 and the point on the hole wall of the second through hole 41A that is closest to this point.

[0161] There are a third point and a fourth point on the edge of the orthographic projection of the first pressure relief mechanism 212 on the first plate body 41. The distance between the third point and the point on the hole wall of the second through hole 41A that is closest to the third point may be equal to the distance between the fourth point and the point on the hole wall of the second through hole 41A that is closest to the fourth point, or may not be equal to the distance between the fourth point and the point on the hole wall of the second through hole 41A that is closest to the second point.

[0162] Exemplarily, H2 can be 0 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc.

[0163] In this embodiment, when H2 is greater than or equal to 0 mm, the risk that the first pressure relief mechanism 212 cannot be opened normally due to the interference between the second through hole 41A and the first pressure relief mechanism 212 can be reduced; when H2 is greater than or equal to 1 mm, the volume of the first convex portion 42 provided around the second through hole 41A can be reduced, so that the aperture of the first through hole 13B can be reduced, and further the influence of the first through hole 13B on the structural strength of the first beam body 13 can be reduced, the structural strength of the first beam body 13 and the box body 10 can be improved, and thus the impact resistance of the battery device 100 can be improved. Therefore, 0 mm ≤ H2 ≤ 1 mm, which not only reduces the risk that the first pressure relief mechanism 212 cannot be opened normally due to the interference between the first convex portion 42 and the first pressure relief mechanism 212, but also improves the impact resistance of the battery device 100, thereby improving the reliability of the battery device 100.

[0164] According to some embodiments of the present application, the first insulating member 40 is a mica plate, a rigid foam, or a composite ceramic sheet.

[0165] In this embodiment, by setting the first insulating member 40 as a mica plate, a rigid foam, or a composite ceramic sheet, the first insulating member 40 can have certain heat resistance, so that when the first battery cell 21 undergoes thermal runaway, the risk that the first outer shell 211 and the first pressure relief mechanism 212 melt the first insulating member 40 and cause a short circuit between the first battery cell 21 and the first beam body 13 can be reduced, thereby further improving the reliability of the battery device 100.

[0166] According to some embodiments of the present application, the first insulating member 40 is an insulating coating, and at least a part of the insulating coating is coated on the inner wall of the first through hole 13B.

[0167] Exemplarily, the first insulating member 40 may be a ceramic insulating coating, a polyurethane composite heat insulation coating, etc.

[0168] In this embodiment, by setting the first insulating member 40 as an insulating coating and coating the insulating coating on the inner wall of the first through hole 13B to insulate and isolate the inner wall of the first through hole 13B and the first pressure relief mechanism 212 when the pressure relief mechanism is opened, the structure is simple and easy to implement.

[0169] According to some embodiments of the present application, the insulating coating includes a first part and a second part. The first part is coated on the side of the first beam body 13 facing the first battery cell assembly 20, and the second part is coated on the inner wall of the first through hole 13B.

[0170] The first part is the part of the insulating coating coated on the side of the first beam body 13 facing the first battery cell assembly 20. The second part is the part of the insulating coating coated on the inner wall of the first through hole 13B.

[0171] In some embodiments, the first part covers the outer surface of the first side plate 131 facing the first battery cell 21.

[0172] In some embodiments, the second part extends from the side of the first side plate 131 facing the first battery cell assembly 20 to the side of the first side plate 131 away from the first battery cell assembly 20.

[0173] In this embodiment, by coating the first part on the side of the first beam 13 facing the first battery cell assembly 20, the risk of short - circuit between the first battery cell 21 and the first beam 13 is reduced; at the same time, by coating the second part on the hole wall of the first through - hole 13B, when the pressure - relief mechanism is opened, the hole wall of the first through - hole 13B and the first pressure - relief mechanism 212 are insulated from each other, thereby reducing the risk of short - circuit between the first battery cell 21 and the first beam 13 caused by the overlap between the first pressure - relief mechanism 212 and the hole wall of the first through - hole 13B when the first pressure - relief mechanism 212 is opened, and further improving the reliability of the battery device 100.

[0174] Please refer to Figures 12 - 14 , Figure 12 which is a schematic structural diagram of another battery device 100 provided in some embodiments of the present application. Figure 13 which is an exploded view of the structure of the second battery cell 31 provided in some embodiments of the present application. Figure 14 is Figure 12 a partial cross - sectional view taken along C - C in. According to some embodiments of the present application, the battery device 100 further includes a second battery cell assembly 30 and a second insulating member 50; the second battery cell assembly 30 is disposed in the box body 10, the second battery cell assembly 30 includes a plurality of second battery cells 31 arranged along the first direction X, along the second direction Y, the first beam 13 is located between the first battery cell assembly 20 and the second battery cell assembly 30; a second pressure - relief mechanism 312 is disposed on the side of the second battery cell 31 facing the first beam 13, a third through - hole 13C communicating with the first collection cavity 13A is disposed on the side of the first beam 13 facing the second battery cell assembly 30, and the third through - hole 13C is disposed opposite to the second pressure - relief mechanism 312; wherein, the battery device 100 further includes a second insulating member 50, and the second insulating member 50 is at least partially disposed on the inner circumferential side of the third through - hole 13C to insulate the hole wall of the third through - hole 13C and the pressure - relief mechanism when the pressure - relief mechanism is opened.

[0175] The second battery cell assembly 30 is an assembly composed of a plurality of second battery cells 31 connected in series or in parallel or in a hybrid connection.

[0176] In some embodiments, please refer to Figure 13, the second battery cell 31 includes a second housing 311, a second electrode assembly 313, and a second pressure relief mechanism 312. The second electrode assembly 313 is accommodated within the second housing 311. The second housing 311 has a second wall 3111 facing the second beam body 14, and the second pressure relief mechanism 312 is disposed on the second wall 3111.

[0177] The second housing 311 is a shell-like component for accommodating other structural components of the second battery cell 31 (such as the second electrode assembly 313), and the second housing 311 can also be used to accommodate an electrolyte, such as an electrolyte solution. In some embodiments, an accommodation cavity is formed inside the second housing 311, and the accommodation cavity is used to accommodate the second electrode assembly 313.

[0178] The second wall 3111 is a wall portion of the second housing 311 facing the second beam body 14. Exemplarily, the thickness direction of the second wall 3111 can be parallel to the second direction Y.

[0179] In some embodiments, the second housing 311 includes a second housing body 311A and a second cover plate 311B. The second housing body 311A has an opening, and the second cover plate 311B seals the opening; the second wall 3111 is the second cover plate 311B or the second wall 3111 is a wall portion of the second housing body 311A opposite to the second cover plate 311B.

[0180] The third through hole 13C is a through hole provided on the side of the first beam body 13 facing the second battery cell assembly 30 for allowing the electrolyte solution to enter the first collection cavity 13A. Exemplarily, the third through hole 13C can be integrally formed with the first beam body 13 by stamping, extrusion, etc., or can be formed on the first beam body 13 by turning and milling.

[0181] In some embodiments, one second pressure relief mechanism 312 corresponds to a plurality of third through holes 13C. Along the second direction Y, the orthographic projection of the second pressure relief mechanism 312 covers the corresponding plurality of third through holes 13C.

[0182] In some embodiments, one second pressure relief mechanism 312 corresponds to one third through hole 13C. Along the second direction Y, the orthographic projection of the second pressure relief mechanism 312 covers the corresponding one third through hole 13C.

[0183] The second insulating member 50 is a component for insulating and isolating the hole wall of the third through hole 13C and the second pressure relief mechanism 312. Exemplarily, the second insulating member 50 can be an insulating glue, an insulating coating, or an insulating structural member.

[0184] [[ID=H]]In some embodiments, the second insulating member 50 is annular, and the second insulating member 50 is disposed inside the third through hole 13C and is coaxially disposed with the third through hole 13C.

[0185] In some embodiments, a plurality of second insulating members 50 are provided at intervals along the inner circumferential direction of the third through hole 13C.

[0186] Specifically, when the second pressure relief mechanism 312 is opened, a part of the second pressure relief mechanism 312 is folded inward into the third through hole 13C to abut against the second insulating member 50.

[0187] In some embodiments, the second insulating member 50 includes a second plate body 51 and a second convex portion 52. Along the second direction Y, the second plate body 51 is located between the second battery cell assembly 30 and the first beam body 13. The second plate body 51 is provided with a fourth through hole 51A communicating with the third through hole 13C. The second convex portion 52 protrudes from the side of the second plate body 51 facing away from the second battery cell assembly 30. The second convex portion 52 is disposed around the fourth through hole 51A, and at least a part of the second convex portion 52 is disposed on the inner circumferential side of the third through hole 13C.

[0188] In this embodiment, by disposing at least a part of the second insulating member 50 on the inner circumferential side of the third through hole 13C, the hole wall of the third through hole 13C and the second pressure relief mechanism 312 are insulated and isolated when the second pressure relief mechanism 312 is opened, thereby reducing the risk of short circuit between the second battery cell 31 and the first beam body 13 caused by the overlap between the second pressure relief mechanism 312 and the hole wall of the third through hole 13C when the second pressure relief mechanism 312 is opened, and further improving the reliability of the battery device 100.

[0189] Please refer to Figure 12 , according to some embodiments of the present application, the box body 10 further includes a bottom wall 111 and two second beam bodies 14. The bottom wall 111 bears the first battery cell assembly 20 and the second battery cell assembly 30 along the gravity direction Z. The two second beam bodies 14 are arranged at intervals along the first direction X. Among them, both the first battery cell assembly 20 and the second battery cell assembly 30 are disposed between the two second beam bodies 14, and both ends of the first beam body 13 in the first direction X are respectively connected to the two second beam bodies 14.

[0190] The bottom wall 111 is the wall portion of the box body 10 that bears the battery cell assembly along the gravity direction Z.

[0191] Exemplarily, the bottom wall 111 is the wall portion of the first box body 11 away from the second box body 12, and / or the bottom wall 111 is the wall portion of the second box body 12 away from the first box body 11.

[0192] Exemplarily, the first beam body 13 can be directly connected to the bottom wall 111, or can be connected to other structural members (such as other beam bodies) inside the box body 10 to be arranged along the gravity direction Z with the bottom wall 111.

[0193] The second beam body 14 is a structural beam extending horizontally in the box body 10. Understandably, the extending direction of the second beam body 14 is perpendicular to the extending direction of the first beam body 13. Exemplarily, the extending direction of the second beam body 14 is parallel to the second direction Y.

[0194] In some embodiments, the second beam body 14 may be a frame structure arranged around the edge of the bottom wall 111.

[0195] In some embodiments, the two opposite wall portions of the first outer shell 211 in the first direction X are the two wall portions with the largest area of the first outer shell 211, and the two opposite wall portions of the second outer shell 311 in the first direction X are the two wall portions with the largest area of the second outer shell 311. Both the first battery cell assembly 20 and the second battery cell assembly 30 are arranged between the two second beam bodies 14 to limit the expansion of the first battery cell 21 and the second battery cell 31 in the first direction X through the two second beam bodies 14.

[0196] In some embodiments, the battery device 100 further includes a connecting member 15, and the two ends of the connecting member 15 in the first direction X are respectively connected to the two second beam bodies 14. The connecting members 15 are multiple and arranged at intervals along the second direction Y. Exemplarily, the connecting member 15 may be a pulling belt.

[0197] In this embodiment, by arranging the two second beam bodies 14 spaced apart in the first direction X and arranging both the first battery cell assembly 20 and the second battery cell assembly 30 between the two second beam bodies 14, when the battery device 100 is subjected to an external impact force in the first direction X, the two second beam bodies 14 can buffer the impact force, reducing the risk of damage to the first battery cell assembly 20 and the second battery cell assembly 30, and improving the impact resistance of the battery device 100.

[0198] According to some embodiments of the present application, the interior of the second beam body 14 has a second collection cavity 14A, and the first collection cavity 13A communicates with the second collection cavity 14A.

[0199] The second collection cavity 14A is a cavity structure in the second beam body 14 for accommodating electrolyte. Exemplarily, openings communicating with the outside of the box body 10 may be provided at both ends of the second collection cavity 14A in the second direction Y.

[0200] In this embodiment, by providing a second collection cavity 14A inside the second beam body 14 and connecting the first collection cavity 13A with the second collection cavity 14A, on the one hand, the first collection cavity 13A can cooperate with the second collection cavity 14A to accommodate more electrolyte, thus facilitating the collection of the electrolyte; on the other hand, the second collection cavity 14A can give space for the deformation of the second beam body 14, thereby further enhancing the external force buffering ability of the second beam body 14 in the first direction X, and further enhancing the impact resistance of the battery device 100, so as to improve the reliability of the battery device 100 and the energy storage device 200 provided with the battery device 100.

[0201] According to some embodiments of the present application, refer to Figures 3 to 14As shown, the embodiment of the present application provides a battery device 100, including a box body 10, a first battery cell assembly 20 and a first insulating member 40; the box body 10 includes a first beam body 13, and the interior of the first beam body 13 has a first collecting chamber 13A; the first battery cell assembly 20 is arranged in the box body 10, and the first battery cell assembly 20 includes a plurality of first battery cells 21 arranged along a first direction X, and the first beam body 13 is located on one side of the first battery cell assembly 20 along a second direction Y, and the first direction X is perpendicular to the second direction Y; a first pressure relief mechanism 212 is provided on the side of the first battery cell 21 facing the first beam body 13, and the first beam body 13 faces the side of the first battery cell assembly 20 A first through hole 13B is provided that is connected to the first collecting chamber 13A, and the first through hole 13B is arranged opposite to the first pressure relief mechanism 212; wherein, the battery device 100 also includes a first insulating member 40, the first insulating member 40 includes a first plate body 41 and a first protrusion 42, along the second direction Y, the first plate body 41 is located between the first battery cell assembly 20 and the first beam body 13, and the first plate body 41 is provided with a second through hole 41A that is connected to the first through hole 13B; the first protrusion 42 protrudes from the side of the first plate body 41 away from the first battery cell assembly 20, the first protrusion 42 is arranged around the second through hole 41A, and at least a portion of the first protrusion 42 is arranged on the inner peripheral side of the first through hole 13B. The first beam 13 has a first side plate 131 and a second side plate 132 disposed opposite each other. The first collection chamber 13A is located between the first side plate 131 and the second side plate 132. The first side plate 131 is located between the first battery cell assembly 20 and the second side plate 132. The first side plate 131 is provided with a first through hole 13B. Along the second direction Y, the first protrusion 42 protrudes from the side of the first side plate 131 facing away from the first battery cell assembly 20. Along the second direction Y, the orthographic projection of the first pressure relief mechanism 212 on the first side plate 131 falls within the first through hole 13B. The minimum distance H1 between the orthographic projection of the first pressure relief mechanism 212 on the first side plate 131 and the wall of the first through hole 13B satisfies 1mm≤H1≤2mm. The first battery cell 21 includes a first shell 211, the first shell 211 has a first wall 2111 facing the first beam body 13, and the first pressure relief mechanism 212 is arranged on the first wall 2111; the first plate body 41 is in contact with the first side plate 131 and / or the first wall 2111. Along the second direction Y, the orthographic projection of the first pressure relief mechanism 212 on the first plate body 41 falls into the second through hole 41A. The minimum distance between the orthographic projection of the first pressure relief mechanism 212 on the first plate body 41 and the hole wall of the second through hole 41A is H2, satisfying 0mm≤H2≤1mm. The first insulating member 40 is a mica board, a hard foam or a composite ceramic sheet. The first insulating member 40 is an insulating coating, at least a portion of which is applied to the hole wall of the first through hole 13B.The insulating coating includes a first part and a second part. The first part is coated on the side of the first beam body 13 facing the first battery cell assembly 20, and the second part is coated on the inner wall of the first through hole 13B. The battery device 100 further includes a second battery cell assembly 30 and a second insulating member 50. The second battery cell assembly 30 is disposed in the box body 10. The second battery cell assembly 30 includes a plurality of second battery cells 31 arranged along the first direction X. Along the second direction Y, the first beam body 13 is located between the first battery cell assembly 20 and the second battery cell assembly 30. A second pressure relief mechanism 312 is provided on the side of the second battery cell 31 facing the first beam body 13. A third through hole 13C communicating with the first collection cavity 13A is provided on the side of the first beam body 13 facing the second battery cell assembly 30. The third through hole 13C is disposed opposite to the second pressure relief mechanism 312. Wherein, the battery device 100 further includes a second insulating member 50, and the second insulating member 50 is at least partially disposed on the inner peripheral side of the third through hole 13C to insulate and isolate the inner wall of the third through hole 13C and the pressure relief mechanism when the pressure relief mechanism is opened. The box body 10 further includes a bottom wall 111 and two second beam bodies 14. The bottom wall 111 bears the first battery cell assembly 20 and the second battery cell assembly 30 along the gravity direction. The two second beam bodies 14 are spaced apart along the first direction X. Wherein, both the first battery cell assembly 20 and the second battery cell assembly 30 are disposed between the two second beam bodies 14, and both ends of the first beam body 13 in the first direction X are respectively connected to the two second beam bodies 14. The interior of the second beam body 14 has a second collection cavity 14A, and the first collection cavity 13A communicates with the second collection cavity 14A.

[0202] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0203] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery device, characterized in that, Comprising: A box body, including a first beam body, and a first collection cavity is provided inside the first beam body; A first battery cell assembly is disposed inside the box body. The first battery cell assembly includes a plurality of first battery cells arranged along a first direction. The first beam body is located on one side of the first battery cell assembly along a second direction, and the first direction is perpendicular to the second direction; A first pressure relief mechanism is provided on the side of the first battery cell facing the first beam body. A first through hole communicating with the first collection cavity is provided on the side of the first beam body facing the first battery cell assembly, and the first through hole is disposed opposite to the first pressure relief mechanism; Wherein, the battery device further includes a first insulating member, and the first insulating member is at least partially disposed on the inner circumferential side of the first through hole to insulate and isolate the hole wall of the first through hole and the first pressure relief mechanism when the pressure relief mechanism is opened.

2. The battery device according to claim 1, wherein, The first insulating member includes a first plate body and a first convex portion. Along the second direction, the first plate body is located between the first battery cell assembly and the first beam body. The first plate body is provided with a second through hole communicating with the first through hole; the first convex portion protrudes from the side of the first plate body facing away from the first battery cell assembly, the first convex portion surrounds the second through hole, and at least a part of the first convex portion is disposed on the inner circumferential side of the first through hole.

3. The battery device according to claim 2, characterized in that, Along the second direction, the first beam body has a first side plate and a second side plate which are oppositely arranged. The first collection cavity is located between the first side plate and the second side plate. The first side plate is located between the first battery cell assembly and the second side plate, and the first through hole is provided on the first side plate.

4. The battery device according to claim 3, wherein, Along the second direction, the first convex portion protrudes from the side of the first side plate facing away from the first battery cell assembly.

5. The battery device according to claim 3, characterized in that, Along the second direction, the orthographic projection of the first pressure relief mechanism on the first side plate falls into the first through hole.

6. The battery device according to claim 5, wherein The minimum distance between the orthographic projection of the first pressure relief mechanism on the first side plate and the hole wall of the first through hole is H1, and 1mm ≤ H1 ≤ 2mm is satisfied.

7. The battery device according to claim 3, characterized in that, The first battery cell includes a first outer casing, and the first outer casing has a first wall facing the first beam body. The first pressure relief mechanism is disposed on the first wall; The first plate body is in contact with the first side plate and / or the first wall.

8. The battery device according to claim 2, characterized in that, Along the second direction, the orthographic projection of the first pressure relief mechanism on the first plate body falls into the second through hole.

9. The battery device according to claim 8, wherein The minimum distance between the orthographic projection of the first pressure relief mechanism on the first plate body and the hole wall of the second through hole is H2, and 0mm ≤ H2 ≤ 1mm is satisfied.

10. The battery device according to claim 2, characterized in that, The first insulating member is a mica plate, a rigid foam or a composite ceramic sheet.

11. The battery device according to claim 1, characterized in that, The first insulating member is an insulating coating, and at least a part of the insulating coating is coated on the hole wall of the first through hole.

12. The battery device according to claim 11, wherein The insulating coating includes a first part and a second part. The first part is coated on the side of the first beam body facing the first battery cell assembly, and the second part is coated on the hole wall of the first through hole.

13. The battery device according to claim 1, characterized in that, The battery device further includes: The second battery cell assembly is disposed within the box body. The second battery cell assembly includes a plurality of second battery cells arranged along the first direction. Along the second direction, the first beam body is located between the first battery cell assembly and the second battery cell assembly; A second pressure relief mechanism is provided on a side of the second battery cell facing the first beam body. A third through hole communicating with the first collection cavity is provided on a side of the first beam body facing the second battery cell assembly. The third through hole is disposed opposite to the second pressure relief mechanism; Wherein, the battery device further includes a second insulating member. The second insulating member is at least partially disposed on the inner peripheral side of the third through hole to insulate and isolate the hole wall of the third through hole and the second pressure relief mechanism when the pressure relief mechanism is opened.

14. The battery device according to claim 13, wherein The box body further includes: A bottom wall that bears the first battery cell assembly and the second battery cell assembly along the direction of gravity; Two second beam bodies that are spaced apart along the first direction; Wherein, both the first battery cell assembly and the second battery cell assembly are disposed between the two second beam bodies. Two ends of the first beam body in the first direction are respectively connected to the two second beam bodies.

15. The battery device according to claim 14, characterized in that, A second collection cavity is provided inside the second beam body. The first collection cavity communicates with the second collection cavity.

16. An energy storage device, characterized in that, Including: The battery device according to any one of claims 1-15.

17. An energy storage system, characterized in that, Including: An energy storage converter device; The energy storage device according to claim 16. The energy storage converter device is used for electrically connecting a power generation device and the energy storage device.

18. A charging network, characterized in that, Including: A charging pile; The energy storage device according to claim 16. The energy storage device is used for supplying electric energy to the charging pile.

Images