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 and a first battery monomer assembly, the box body comprises a bottom wall and a first beam body; the first battery monomer assembly is arranged in the box body, the bottom wall bears the first battery monomer assembly in the gravity direction, the first battery monomer assembly comprises a plurality of first battery monomers arranged in the first direction, the first beam body is located on one side of the first battery monomer assembly in the second direction, and the first direction, the second direction and the gravity direction are perpendicular in pairs; the first battery monomer comprises a first shell and a first pressure relief mechanism, the first shell is provided with a first wall facing the first beam body, and the first pressure relief mechanism is arranged on the first wall; wherein the side, facing the first battery monomer assembly, of the bottom wall is locally sunken to form a first groove, and the orthographic projection of the first wall on the bottom wall falls into the first groove in the gravity direction. According to the technical scheme, the reliability of the battery device can be improved.

Description

Technical Field

[0001] The present 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 required. 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 the present 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 the present application provides a battery device, including a box body and a first battery cell assembly; the box body includes a bottom wall and a first beam; the first battery cell assembly is disposed in the box body, the bottom wall bears the first battery cell assembly in the direction of gravity, the first battery cell assembly includes a plurality of first battery cells arranged in a first direction, the first beam is located on one side of the first battery cell assembly in a second direction, and the first direction, the second direction, and the direction of gravity are perpendicular to each other; the first battery cell includes a first outer shell and a first pressure relief mechanism, the first outer shell has a first wall facing the first beam, and the first pressure relief mechanism is disposed on the first wall; wherein, a side of the bottom wall facing the first battery cell assembly is partially recessed to form a first groove, and in the direction of gravity, the orthographic projection of the first wall on the bottom wall falls within the first groove.

[0006] In the above technical solution, by locally recessing one side of the bottom wall facing the first battery cell assembly to form a first groove, and making the positive projection of the first wall on the bottom wall fall into the first groove along the gravity direction, when the first battery cell undergoes thermal runaway and causes the first pressure relief mechanism to actuate, part of the electrolyte discharged from the first pressure relief mechanism can move along the first wall under the action of gravity to fall into the first groove, so that part of the electrolyte can be collected by the first groove, reducing the risk that the electrolyte accumulates in the box body to submerge part of the first housing, resulting in a short circuit between the first battery cells and / or between the first battery cell and the box body, thereby improving the reliability of the battery device.

[0007] In some embodiments, the interior of the first beam has a first collection cavity, and a first through hole communicating with the first collection cavity is provided on one side of the first beam facing the first battery cell assembly, and the first through hole is disposed opposite to the first pressure relief mechanism.

[0008] In the above technical solution, by communicating the first through hole with the first collection cavity and correspondingly disposing the first through hole and the first pressure relief mechanism, when the first battery cell undergoes thermal runaway and causes the first pressure relief mechanism to actuate, part of the electrolyte discharged from the first pressure relief mechanism can enter the first collection cavity through the first through hole to be collected by the first collection cavity, thereby further reducing the risk that the electrolyte accumulates in the box body to submerge part of the first housing, resulting in a short circuit between the first battery cells and / or between the first battery cell and the box body, thereby further improving the reliability of the battery device.

[0009] In some embodiments, along the second direction, the first beam 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, and the first side plate is located between the first battery cell assembly and the second side plate; along the gravity direction, the positive projection of the first side plate on the bottom wall falls into the first groove.

[0010] In the above technical solution, by making the positive projection of the first side plate on the bottom wall fall into the first groove along the gravity direction, when the first battery cell undergoes thermal runaway and causes the first pressure relief mechanism to actuate, part of the electrolyte that does not enter the first collection cavity through the first through hole discharged from the first pressure relief mechanism can move along the first wall and the first side plate under the action of gravity to fall into the first groove, so that part of the electrolyte can be collected by the first groove, further reducing the risk that the electrolyte accumulates in the box body to submerge part of the first housing, resulting in a short circuit between the first battery cells and / or between the first battery cell and the box body, thereby further improving the reliability of the battery device.

[0011] In some embodiments, along the second direction, the orthographic projection of the first pressure relief mechanism on the first side plate falls within the first through hole.

[0012] In the above technical solution, by making the orthographic projection of the first pressure relief mechanism on the first side plate fall within the first through hole along the second direction; on the one hand, the first through hole has a relatively large cross-sectional area, which facilitates the electrolyte to enter the first collection cavity through the first through hole, thereby further reducing the risk of the electrolyte accumulating in the box body to submerge part of the first outer shell, resulting in a short circuit between the first battery cells and / or between the first battery cell and the box body; on the other hand, when the first pressure relief mechanism is opened, the first through hole can be used for the first beam body to avoid the first pressure relief mechanism, so when the first battery cell causes the first pressure relief mechanism to actuate due to thermal runaway, the risk of the first pressure relief mechanism not being able to open normally due to interference between the first beam body and the first pressure relief mechanism is reduced, thereby further improving the reliability of the battery device.

[0013] 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 H, and 1mm ≤ H ≤ 2mm is satisfied.

[0014] In the above technical solution, by H being greater than or equal to 1mm, the risk of the first pressure relief mechanism not being able to open normally due to interference between the first beam body and the first pressure relief mechanism is further reduced; by H being less than or equal to 2mm, 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 improved, thereby improving the impact resistance of the battery device. Therefore, 1mm ≤ H ≤ 2mm makes it possible to reduce the risk of the first pressure relief mechanism not being able to open normally due to interference between the first beam body and the first pressure relief mechanism and improve the impact resistance of the battery device, thereby improving the reliability of the battery device.

[0015] In some embodiments, the battery device further includes a first insulating member; along the second direction, at least part of the first insulating member is located between the first battery cell assembly and the first beam body, and the first insulating member is provided with a second through hole, and the second through hole is communicated with the first through hole.

[0016] In the above technical solution, by arranging at least part of the first insulating member 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, and the reliability of the battery device is improved.

[0017] In some embodiments, the first insulating member includes a main body and a protrusion; along the second direction, the main body is located between the first battery cell assembly and the first beam body, and the main body is provided with the second through hole; the protrusion protrudes from the side of the main body facing the first side plate, and the protrusion is arranged around the second through hole and is located in the first through hole.

[0018] In the above technical solution, by arranging the convex portion around the second through hole and making the convex portion located in the first through hole, the convex portion can abut against the first pressure relief mechanism when the first pressure relief mechanism is opened to insulate and isolate the first pressure relief mechanism and the hole wall of the first through hole, thereby reducing the risk of the first pressure relief mechanism overlapping with the hole wall of the first through hole when the first pressure relief mechanism is opened, causing a short circuit between the first battery cell and the first beam body, thereby improving the reliability of the battery device.

[0019] In some embodiments, along the second direction, the protrusion protrudes from a side of the first side plate facing away from the first battery cell assembly.

[0020] In the above technical solution, by protruding the convex portion from the side of the first side plate away from the first battery cell assembly, the convex portion extends from the end of the first through hole close to the first battery cell to the end of the first through hole away from the first battery cell, thereby further reducing the risk of the first pressure relief mechanism overlapping with the hole wall of the first through hole when opened, causing a short circuit between the first battery cell and the first beam, thereby further improving the reliability of the battery device.

[0021] In some embodiments, along the second direction, a side of the first insulating member facing the first battery cell assembly is partially recessed to form a second groove, and the second groove communicates with the second through hole and the first groove.

[0022] In the above technical solution, by partially recessing the side of the first insulating member facing the first battery cell assembly to form a second groove, and by connecting the second through-hole and the first groove, the electrolyte that has not entered the second through-hole is guided by the second groove to move toward the first groove for collection. This reduces the risk of electrolyte accumulating in the housing and partially submerging the first housing, causing short circuits between the first battery cells and / or between the first battery cell and the housing, thereby improving the reliability of the battery device.

[0023] In some embodiments, the second groove has a first end and a second end relatively arranged in the gravity direction, the first end is connected to the second through hole, and the second end is connected to the first groove; the size of the first end in the first direction is larger than the maximum size of the second through hole in the first direction.

[0024] In the above technical solution, by making the size of the first end in the first direction larger than the maximum size of the second through hole in the first direction, it is convenient for the second groove to better guide the electrolyte that has not entered the second through hole to move towards the first groove, thereby further improving the reliability of the battery device.

[0025] In some embodiments, the first insulating member is a mica plate, a rigid foam, or a composite ceramic sheet.

[0026] 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. Thus, when the first battery cell undergoes thermal runaway, the risk of the first outer shell and the first pressure relief mechanism melting the first insulating member and causing a short circuit between the first battery cell and the first beam body is reduced, thereby further improving the reliability of the battery device.

[0027] In some embodiments, the battery device further includes a second battery cell assembly; the second battery cell assembly is disposed in the box body, the bottom wall bears the second battery cell assembly along the gravity direction, the second battery cell assembly includes a plurality of second battery cells arranged along the first direction, and along the second direction, the first beam body is located between the first battery cell assembly and the second battery cell assembly; the second battery cell includes a second outer shell and a second pressure relief mechanism, the second outer shell has a second wall facing the first beam body, and the second pressure relief mechanism is disposed on the second wall; along the gravity direction, the orthographic projection of the second wall on the bottom wall falls into the first groove; a third through hole communicating with the first collection cavity is provided on one side of the first beam body facing the second battery cell assembly, and the third through hole is disposed opposite to the second pressure relief mechanism.

[0028] In the above technical solution, by making the orthographic projection of the second wall on the bottom wall fall into the first groove along the gravity direction, when the second battery cell undergoes thermal runaway and the second pressure relief mechanism is actuated, part of the electrolyte discharged from the second pressure relief mechanism can move along the second wall under the action of gravity to fall into the second groove, so that part of the electrolyte can be collected by the second groove; at the same time, by communicating the third through hole with the first collection cavity and correspondingly disposing the third through hole and the second pressure relief mechanism, when the second battery cell undergoes thermal runaway and the second pressure relief mechanism is actuated, part of the electrolyte discharged from the second pressure relief mechanism can enter the first collection cavity through the second through hole to be collected by the first collection cavity, thereby further reducing the risk of the electrolyte accumulating in the box body to submerge part of the second outer shell and causing a short circuit between the second battery cells and / or between the second battery cell and the box body, thereby further improving the reliability of the battery device.

[0029] In some embodiments, the box body further includes two second beam bodies; the two second beam bodies are arranged at intervals along the first direction; wherein, both the first battery cell assembly and the second battery cell assembly are arranged between the two second beam bodies, and two ends of the first beam body in the first direction are respectively connected to the two second beam bodies.

[0030] In the above technical solution, by arranging two second beam bodies arranged at intervals 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.

[0031] In some embodiments, the interior of the second beam body has a second collection cavity, and the first collection cavity is communicated with the second collection cavity.

[0032] In the above technical solution, by arranging 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, thereby further reducing the risk of the electrolyte accumulating in the box body to submerge part of the first outer shell, resulting in a short circuit between the first battery cells and / or between the first battery cells and the box body; on the other hand, the second collection cavity can give the second beam body space for deformation, thereby further improving the external force buffering ability of the second beam body 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.

[0033] 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.

[0034] 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.

[0035] 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. Description of the Drawings

[0036] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0037] Figure 1 Structural schematic diagram of a charging network provided by some embodiments of the present application;

[0038] Figure 2 Structural schematic diagram of an energy storage system provided by some embodiments of the present application;

[0039] Figure 3 Structural schematic diagram of an energy storage device provided by some embodiments of the present application;

[0040] Figure 4 Exploded view of the structure of a battery device provided by some embodiments of the present application;

[0041] Figure 5 Structural schematic diagram of another battery device provided by some embodiments of the present application;

[0042] Figure 6 Exploded view of the structure of a first battery cell provided by some embodiments of the present application;

[0043] Figure 7 For Figure 5 Cross-sectional view taken along A - A in

[0044] Figure 8 For Figure 7 Enlarged view at B in

[0045] Figure 9 Structural schematic diagram of a first beam body provided by some embodiments of the present application;

[0046] Figure 10 Structural schematic diagram of a first insulating member provided by some embodiments of the present application;

[0047] Figure 11 Cross-sectional view of another battery device provided by some embodiments of the present application in another direction;

[0048] Figure 12 For Figure 11 Enlarged view at C in

[0049] Figure 13 Structural schematic diagram of yet another battery device provided by some embodiments of the present application;

[0050] Figure 14Explosion structure diagram of the second battery cell provided by some embodiments of the present application;

[0051] Figure 15 For Figure 13 The sectional view taken along D-D in

[0052] Icon: 1000 - charging network; 2000 - energy storage system; 3000 - power generation device; 100 - battery device; 10 - box body; 11 - first box body; 111 - bottom wall; 1111 - first groove; 12 - second box body; 13 - first beam; 13A - first collection cavity; 13B - first through hole; 13C - third through hole; 131 - first side plate; 132 - second side plate; 133 - connecting part; 14 - second beam; 14A - second collection cavity; 15 - connecting piece; 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 - body; 411 - second groove; 411A - first end; 411B - second end; 41A - second through hole; 42 - convex part; 200 - energy storage device; 210 - energy storage box body; 300 - charging pile; 400 - energy storage converter device; X - first direction; Y - second direction; Z - gravity direction. Detailed implementation manners

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the description of the present application in the specification of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific order or primary-secondary relationship.

[0055] Reference to "embodiment" in this application means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0056] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside 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.

[0057] The term "and / or" in this application is merely a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can 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.

[0058] 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, etc. of various components in the embodiments of this application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to this application.

[0059] The term "a plurality of" appearing in this application refers to two or more (including two).

[0060] The 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 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.

[0061] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a 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 can be formed by bundling a plurality of battery cells with cable ties.

[0062] In some embodiments, the battery device may be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0063] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body by fixing the battery module in the box body.

[0064] As an example, the battery cell assembly may also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0065] 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 may be sealed or non-sealed. The first box body may be a top cover or a bottom plate.

[0066] 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.

[0067] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0068] 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 may be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, and the embodiments of this application are not limited thereto either.

[0069] 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 play a role in preventing short circuit between the positive and negative electrodes and at the same time allow the active ions to pass through.

[0070] Optionally, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0071] Optionally, the electrode assembly is a stacked structure.

[0072] Optionally, the shape of the electrode assembly may be cylindrical, flat, or multi-prismatic, etc.

[0073] 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. The energy storage power station can store electric energy during the low electricity consumption period and supply electric energy to relevant users or electrical equipment during the high electricity consumption period. After the wind energy collected by the wind turbine generator in the wind power generation system is converted into electric energy, it is stored by the energy storage device. The solar power generation system can convert solar energy into electric energy, store it by the energy storage device, and supply it to users at the right time. The 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 wild areas. The temporary power supply system can supply power to users in 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.

[0074] 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. When the pressure relief mechanism is opened, the electrolyte in the battery cell, 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 may all be discharged through the pressure relief mechanism. The accumulation of the electrolyte on the bottom wall of the box body may submerge part of the outer shell of the battery cell, resulting in a short circuit between adjacent battery cells and / or between the battery cell and the structural components in the box body.

[0075] 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, including a box body and a first battery cell assembly; the box body includes a bottom wall and a first beam; the first battery cell assembly is disposed in the box body, the bottom wall bears the first battery cell assembly along the gravity direction, the first battery cell assembly includes a plurality of first battery cells arranged along a first direction, the first beam is located on one side of the first battery cell assembly along a second direction, and the first direction, the second direction, and the gravity direction are perpendicular to each other in pairs; the first battery cell includes a first outer shell and a first pressure relief mechanism, the first outer shell has a first wall facing the first beam, and the first pressure relief mechanism is disposed on the first wall; wherein, a part of the side of the bottom wall facing the first battery cell assembly is recessed to form a first groove, and along the gravity direction, the orthographic projection of the first wall on the bottom wall falls into the first groove.

[0076] In the battery device with such a structure, by locally recessing one side of the bottom wall facing the first battery cell assembly to form a first groove, and making the orthographic projection of the first wall on the bottom wall fall into the first groove along the direction of gravity, when the first pressure relief mechanism is actuated due to thermal runaway of the first battery cell, part of the electrolyte discharged from the first pressure relief mechanism can move along the first wall under the action of gravity to fall into the first groove, so that part of the electrolyte can be collected by the first groove, reducing the risk of the electrolyte accumulating in the box body to immerse part of the first outer shell, resulting in a short circuit between the first battery cells and / or between the first battery cell and the box body, thereby improving the reliability of the battery device.

[0077] The battery device 100 will be described below with reference to the accompanying drawings.

[0078] 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, and the charging pile 300 is used to charge an electrical device. The charging network 1000 may further include an energy storage device 200. The energy storage device 200 is electrically connected to the charging pile 300, and the energy storage device 200 is used to provide electrical energy for the charging pile 300.

[0079] 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 provide the electrical energy stored in themselves for the charging pile 300. The charging pile 300 has a connector, and the connector can be connected to the electrical device, so as to replenish 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.

[0080] In a charging network 1000, there can be one charging pile 300, and the energy storage device 200 provides electrical energy for one charging pile 300; there can also be multiple charging piles 300, and the energy storage device 200 provides electrical energy for multiple charging piles 300.

[0081] 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 provides electrical energy for two charging piles 300.

[0082] The energy storage device 200 may include a battery device 100, and the battery device 100 is electrically connected to a charging pile 300 so that the battery device 100 can supply electrical energy to the charging pile 300.

[0083] Please refer to Figure 2 and Figure 3 , Figure 2 which is a schematic structural diagram of an 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 a 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 electrical energy provided by the power generation device 3000 through power conversion and then imports it into the energy storage device 200 for storage.

[0084] 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 electrical energy, and the power generation device 3000 is used to store the electrical energy generated by it into the energy storage device 200 through the power conversion device. The energy storage system 2000 applying the energy storage device 200 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 hydraulic 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.

[0085] 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 electrical energy to the energy storage converter device 400, and the electrical energy is imported into the energy storage device 200 for storage through the energy storage converter device 400.

[0086] Please refer to Figure 3 , the energy storage device 200 includes an energy storage box body 210, and a battery device 100 is arranged inside the energy storage box body 210.

[0087] Please refer to Figures 4 - 8 , Figure 4 which is an exploded view of the structure of the battery device 100 provided by some embodiments of the present application, Figure 5 which is a schematic structural diagram of another battery device 100 provided by some embodiments of the present application, Figure 6 which is an exploded view of the structure of the first battery cell 21 provided by some embodiments of the present application, Figure 7 is Figure 5 the sectional view taken along A-A in Figure 8 is 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 and a first battery cell assembly 20; the box body 10 includes a bottom wall 111 and a first beam body 13; the first battery cell assembly 20 is disposed inside the box body 10, the bottom wall 111 bears the first battery cell assembly 20 along the gravity direction Z, the first battery cell assembly 20 includes a plurality of first battery cells 21 arranged along the first direction X, the first beam body 13 is located on one side of the first battery cell assembly 20 along the second direction Y, and the first direction X, the second direction Y, and the gravity direction Z are perpendicular to each other in pairs; the first battery cell 21 includes a first outer shell 211 and a first pressure relief mechanism 212, the first outer shell 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; wherein, a part of the side of the bottom wall 111 facing the first battery cell assembly 20 is recessed to form a first groove 1111, and along the gravity direction Z, the orthographic projection of the first wall 2111 on the bottom wall 111 falls into the first groove 1111.

[0088] 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 is covered on 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 is covered on the open side of the second box body 12.

[0089] 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 it, the shape of the box body 10 is a cuboid.

[0090] In the battery device 100, the number of battery cells disposed inside the box body 10 can be one or multiple. When there are multiple battery cells disposed inside the box body 10, the multiple battery cells can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells. The multiple battery cells can 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 inside the box body 10; of course, the battery device 100 can also be that multiple battery cells are first connected in series, in parallel, or in a mixed connection to form the form of a battery cell assembly, 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 inside the box body 10.

[0091] 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.

[0092] 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, cylindrical, prismatic or other shape, etc. Exemplarily, in Figure 3 and Figure 4 the battery cell has a cuboid structure.

[0093] The bottom wall 111 is the wall portion of the box body 10 that bears the battery cell assembly in the gravity direction Z.

[0094] 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.

[0095] The first beam body 13 is a structural beam extending in the horizontal direction in the box body 10.

[0096] In some embodiments, the first beam body 13 may be a frame structure arranged around the edge of the bottom wall 111.

[0097] 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.

[0098] Exemplarily, the first beam body 13 may be directly connected to the bottom wall 111, or may be connected to other structural members (such as other beam bodies) in the box body 10 to be arranged with the bottom wall 111 in the gravity direction Z.

[0099] 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.

[0100] 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.

[0101] The first outer shell 211 is a shell-like component for accommodating the first battery cell 21 and other structural components (such as the first electrode assembly 213). The first outer shell 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 outer shell 211, and the accommodation cavity is used to accommodate the first electrode assembly 213.

[0102] In some embodiments, the material of the first outer shell 211 can be metal or a combination of metal and non-metal. For example, the first outer shell 211 can be made of metal, such as aluminum, copper, iron, aluminum, steel, or aluminum alloy, etc.; or for another example, a part of the first outer shell 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 outer shell 211 can be made of non-metal materials.

[0103] 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 can be parallel to the second direction Y.

[0104] 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.

[0105] The first electrode assembly 213 is a component in the first battery cell 21 where an electrochemical reaction occurs.

[0106] 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.

[0107] In an 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.

[0108] Exemplarily, one first electrode assembly 213 can be accommodated inside the first outer shell 211, or multiple first electrode assemblies 213 can be accommodated. The multiple first electrode assemblies 213 are arranged along the first direction X.

[0109] A pressure relief mechanism refers to an element or component that actuates to release internal pressure or temperature when the internal pressure, 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 tab, negative electrode tab, electrolyte, and separator in the battery cell. The pressure relief mechanism can be in the form of, for example, an explosion-proof valve, air valve, pressure relief valve, or safety valve, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure. That is, when the internal pressure, 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.

[0110] 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 breaking, shattering, 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, thus avoiding potential more serious accidents.

[0111] The first groove 1111 is a groove-shaped structure provided on the bottom wall 111 for receiving the electrolyte. Exemplarily, the first groove 1111 can be integrally formed with the bottom wall 111 by stamping, extrusion, etc., or can be formed on the bottom wall 111 by turning and milling.

[0112] It can be understood that the extending direction of the first groove 1111 should be parallel to the arrangement direction of the first battery cells 21, that is, the extending direction of the first groove 1111 is parallel to the second direction Y.

[0113] "Along the gravity direction Z, the orthographic projection of the first wall 2111 on the bottom wall 111 falls within the first groove 1111" means that the orthographic projection of the first wall 2111 on the bottom wall 111 is located between the two relatively arranged edges of the first groove 1111 in the second direction Y.

[0114] In some embodiments, the first groove 1111 has two relatively arranged groove walls in the second direction Y. In a plane perpendicular to the gravity direction Z, the orthographic projection of the first wall 2111 is located between the orthographic projections of the two groove walls of the first groove 1111, or the orthographic projection of the first wall 2111 overlaps with the orthographic projection of one of the two groove walls of the first groove 1111 that is closer to the first battery cell 21 and farther from the first beam 13.

[0115] In some embodiments, a water-absorbing material (such as a water-absorbing resin) may be disposed in the first groove 1111 to quickly absorb the electrolyte after the electrolyte enters the first groove 1111, thereby reducing the risk of the electrolyte overflowing from the notch of the first groove 1111.

[0116] In some implementations, a flow channel communicating with the outside of the box body 10 is provided on the wall of the first groove 1111. Exemplarily, one end of the flow channel located inside the first groove 1111 is higher than the end of the flow channel communicating with the outside of the box body 10, so that the electrolyte flows out of the box body 10 under the action of gravity, thereby reducing the risk of the electrolyte overflowing from the notch of the first groove 1111.

[0117] It can be understood that the first pressure relief mechanism 212 is disposed on the first wall 2111 of the first battery cell 21, so that when the first pressure relief mechanism 212 is opened, the discharge moves along the second direction Y towards the first beam body 13. Due to the action of gravity, part of the electrolyte in the discharge will flow from the gap between the first wall 2111 and the first beam body 13 to the bottom wall 111. When the electrolyte on the bottom wall 111 accumulates to a certain depth, the electrolyte will submerge the insulating structure (such as insulating glue, blue film, etc.) between the first battery cell 21 and the box body 10, thereby causing a short circuit between the first battery cell 21 and the first battery cell 21, and / or between the first battery cell 21 and the box body 10.

[0118] In this embodiment, by locally recessing one side of the bottom wall 111 facing the first battery cell assembly 20 to form the first groove 1111, and making the orthographic projection of the first wall 2111 on the bottom wall 111 fall into the first groove 1111 along the gravity direction Z, when the first pressure relief mechanism 212 is actuated due to thermal runaway of the first battery cell 21, part of the electrolyte discharged from the first pressure relief mechanism 212 can move along the first wall 2111 under the action of gravity to fall into the first groove 1111, so that part of the electrolyte can be collected by the first groove 1111, reducing the risk of the electrolyte accumulating in the box body 10 to submerge part of the first housing 211, resulting in a short circuit between the first battery cell 21 and the first battery cell 21, and / or between the first battery cell 21 and the box body 10, thereby improving the reliability of the battery device 100.

[0119] Please refer to Figure 7 and Figure 8 , according to some embodiments of the present application, the inside of the first beam body 13 has a first collection cavity 13A, and a first through hole 13B communicating with the first collection cavity 13A is provided on the 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.

[0120] The first collection chamber 13A is a cavity structure within the first beam body 13 for accommodating the electrolyte. Exemplarily, the first collection chamber 13A can be directly connected to the outside of the box body 10, or can be indirectly connected to the outside of the box body 10 through other structures (such as flow channels, through holes, etc.).

[0121] In some embodiments, a cavity is provided within the first beam body 13, and the first collection chamber 13A is this cavity.

[0122] In some embodiments, multiple independent cavities are provided within the first beam body 13, and the first collection chamber 13A is one of the cavities.

[0123] 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 chamber 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.

[0124] 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.

[0125] 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.

[0126] In this embodiment, by connecting the first through hole 13B with the first collection chamber 13A and correspondingly arranging the first through hole 13B with the first pressure relief mechanism 212, when the first pressure relief mechanism 212 is actuated due to thermal runaway of the first battery cell 21, part of the electrolyte discharged from the first pressure relief mechanism 212 can enter the first collection chamber 13A through the first through hole 13B to be collected by the first collection chamber 13A, thereby further reducing the risk that the electrolyte accumulates in the box body 10 to submerge part of the first outer shell 211, resulting in a short circuit between the first battery cells 21 and / or between the first battery cell 21 and the box body 10, and thus further improving the reliability of the battery device 100.

[0127] Please refer to Figure 8 , 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 arranged opposite to each other. The first collection chamber 13A is located between the first side plate 131 and the second side plate 132, and the first side plate 131 is located between the first battery cell assembly 20 and the second side plate 132; along the gravity direction Z, the orthographic projection of the first side plate 131 on the bottom wall 111 falls within the first groove 1111.

[0128] The first side plate 131 and the second side plate 132 are two wall portions of the first beam body 13 oppositely arranged in the second direction Y. Exemplarily, the thickness directions of the first side plate 131 and the second side plate 132 are both parallel to the second direction Y.

[0129] In some embodiments, the first beam body 13 further has connecting portions 133. There are two connecting portions 133, and the two connecting portions 133 respectively connect two end portions of the first side plate 131 and the second side plate 132 oppositely arranged in the gravity direction Z. The first side plate 131, the second side plate 132 and the two connecting portions 133 enclose and form a first collection cavity 13A.

[0130] In some embodiments, please refer to Figure 8 , the first beam body 13 further has connecting portions 133. There are multiple connecting portions 133. The connecting portions 133 located at opposite two end portions in the gravity direction Z respectively connect two end portions of the first side plate 131 and the second side plate 132 oppositely arranged in the gravity direction Z. The first side plate 131, the second side plate 132 and two adjacent connecting portions 133 enclose and form a first collection cavity 13A.

[0131] "In the gravity direction Z, the orthographic projection of the first side plate 131 on the bottom wall 111 falls into the first groove 1111" means that the orthographic projection of the first side plate 131 on the bottom wall 111 is located between two opposite edges of the first groove 1111 in the second direction Y.

[0132] In some embodiments, the first groove 1111 has two opposite groove walls in the second direction Y. In a plane perpendicular to the gravity direction Z, the orthographic projection of the first side plate 131 is located between the orthographic projections of the two groove walls of the first groove 1111, or the orthographic projection of the first side plate 131 overlaps with the orthographic projection of a groove wall that is farther from the first battery cell 21 and closer to the first beam body 13 among the two groove walls of the first groove 1111.

[0133] It can be understood that in the gravity direction Z, the orthographic projection of the first wall 2111 on the bottom wall 111 falls into the first groove 1111, and the orthographic projection of the first side plate 131 on the bottom wall 111 falls into the first groove 1111, so that the orthographic projections of the spaces between the first wall 2111 and the first side plate 131 in the second direction Y on the bottom plate all fall into the first groove 1111, so that the electrolyte moving in the gravity direction Z between the first wall 2111 and the first side plate 131 can be better collected by the first groove 1111 under the limiting action of the first wall 2111 and the first side plate 131.

[0134] In this embodiment, by making the orthographic projection of the first side plate 131 on the bottom wall 111 along the gravity direction Z fall into the first groove 1111, when the first pressure relief mechanism 212 is actuated due to thermal runaway of the first battery cell 21, part of the electrolyte discharged from the first pressure relief mechanism 212 and not entering the first collection chamber 13A through the first through hole 13B can move along the first wall 2111 and the first side plate 131 under the action of gravity to fall into the first groove 1111, so that part of the electrolyte can be collected by the first groove 1111, further reducing the risk that the electrolyte accumulates in the box body 10 to submerge part of the first housing 211, resulting in a short circuit between the first battery cell 21 and the first battery cell 21, and / or between the first battery cell 21 and the box body 10, thereby further improving the reliability of the battery device 100.

[0135] Please refer to Figure 9 , Figure 9 FIG. 3 is a schematic structural diagram of the first beam body 13 provided in 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 into the first through hole 13B.

[0136] 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.

[0137] 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.

[0138] 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 into 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 the electrolyte to enter the first collection chamber 13A through the first through hole 13B, thereby further reducing the risk that the electrolyte accumulates in the box body 10 to submerge part of the first housing 211, resulting in a short circuit between the first battery cell 21 and the first battery cell 21, and / or between the first battery cell 21 and the box body 10; on the other hand, when the first pressure relief mechanism 212 is opened, the first through hole 13B can be used for the first beam body 13 to avoid the first pressure relief mechanism 212, so that when the first battery cell 21 causes the first pressure relief mechanism 212 to be actuated due to thermal runaway, the risk that the first pressure relief mechanism 212 cannot be normally opened due to interference between the first beam body 13 and the first pressure relief mechanism 212 is reduced, thereby further improving the reliability of the battery device 100.

[0139] Please refer toFigure 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 side plate 131 and the pore wall of the first through hole 13B is H, satisfying 1 mm ≤ H ≤ 2 mm.

[0140] The minimum distance between the orthographic projection of the first pressure relief mechanism 212 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 with the minimum distance from this point.

[0141] 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 distance between the first point and the point on the pore wall of the first through hole 13B with the minimum distance from the first point may be equal to the distance between the second point and the point on the pore wall of the first through hole 13B with the minimum distance from the second point, or may not be equal to the distance between the second point and the point on the pore wall of the first through hole 13B with the minimum distance from the second point.

[0142] Exemplarily, H may be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc.

[0143] In this embodiment, by H being greater than or equal to 1 mm, the risk that the first pressure relief mechanism 212 cannot be normally opened due to the interference between the first beam 13 and the first pressure relief mechanism 212 is further reduced; by H being less than or equal to 2 mm, the influence of the first through hole 13B on the structural strength of the first beam 13 is reduced, the structural strength of the first beam 13 and the box body 10 is improved, thereby improving the impact resistance of the battery device 100. Therefore, 1 mm ≤ H ≤ 2 mm enables both reducing the risk that the first pressure relief mechanism 212 cannot be normally opened due to the interference between the first beam 13 and the first pressure relief mechanism 212 and improving the impact resistance of the battery device 100, thereby improving the reliability of the battery device 100.

[0144] Please refer to Figure 8 and please refer to Figures 10 - 12 Figure 10 is a schematic structural diagram of the first insulating member 40 provided by some embodiments of the present application, Figure 11 is a cross-sectional view of another battery device 100 provided by some embodiments of the present application in another direction, Figure 12 is Figure 11 ​An enlarged view of the position C. According to some embodiments of the present application, the battery device 100 further includes a first insulating member 40; along the second direction Y, at least a part of the first insulating member 40 is located between the first battery cell assembly 20 and the first beam body 13, and the first insulating member 40 is provided with a second through hole 41A, and the second through hole 41A communicates with the first through hole 13B.

[0145] The first insulating member 40 is a component for insulating and isolating the first beam body 13 and the first battery cell 21. Exemplarily, the first insulating member 40 can be an insulating adhesive, an insulating coating or an insulating structural member.

[0146] In some implementations, please refer to Figure 10 , the first insulating member 40 is in a plate shape, and the thickness direction of the first insulating member 40 is parallel to the first direction X.

[0147] The second through hole 41A is a through hole provided on the first insulating member 40 for allowing the electrolyte to enter the first through hole 13B and the first collection cavity 13A. Exemplarily, the second through hole 41A can be integrally formed with the first insulating member 40 by stamping, extrusion, etc., or can be formed on the first insulating member 40 by turning and milling.

[0148] Exemplarily, the first insulating member 40 can be disposed on the outer surface of the first side plate 131.

[0149] In some embodiments, at least a part of the first insulating member 40 is adhered to the side of the first side plate 131 facing the first battery cell assembly 20.

[0150] In this embodiment, by disposing at least a part of the first insulating member 40 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, and the reliability of the battery device 100 is improved.

[0151] According to some embodiments of the present application, the first insulating member 40 includes a main body 41 and a convex portion 42; along the second direction Y, the main body 41 is located between the first battery cell assembly 20 and the first beam body 13, and the main body 41 is provided with a second through hole 41A; the convex portion 42 protrudes from the side of the main body 41 facing the first side plate 131, the convex portion 42 is disposed around the second through hole 41A, and is located in the first through hole 13B.

[0152] The main body 41 is the part of the first insulating member 40 for insulating and isolating the first beam body 13 and the first battery cell 21, and the convex portion 42 is the part of the first insulating member 40 for insulating and isolating 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.

[0153] Understandably, the convex portion 42 is an annular structure surrounding the second through hole 41A, and the interior of the convex portion 42 communicates with the second through hole 41A.

[0154] In some embodiments, the outer side of the 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 convex portion 42 and the hole wall of the first through hole 13B.

[0155] Exemplarily, the end of the convex portion 42 facing away from the 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 convex portion 42 facing away from the body 41, or the end of the convex portion 42 facing away from the body 41 protrudes from the inner surface of the first side plate 131.

[0156] In some embodiments, the convex portion 42 is formed on the body 41 by stamping or extrusion.

[0157] In this embodiment, by arranging the convex portion 42 around the second through hole 41A and making the convex portion 42 located within the first through hole 13B, when the first pressure relief mechanism 212 is opened, it can abut against the first pressure relief mechanism 212 to insulate and isolate the first pressure relief mechanism 212 and the hole wall of the first through hole 13B, thereby reducing the risk of short circuit between the first battery cell 21 and the first beam body 13 caused by the overlap of 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 improving the reliability of the battery device 100.

[0158] Refer to Figure 8 and please refer to Figure 11 Figure 11 FIG. 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, along the second direction Y, the convex portion 42 protrudes from the side of the first side plate 131 facing away from the first battery cell assembly 20.

[0159] Understandably, along the second direction Y, the 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 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.

[0160] In this embodiment, by making the convex portion 42 protrude from the side of the first side plate 131 facing away from the first battery cell assembly 20, such that the 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, the risk of short circuit between the first battery cell 21 and the first beam body 13 caused by the overlap of 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.

[0161] Refer to​Figure 11 , and please refer to Figure 12 , Figure 12 is Figure 11 an enlarged view of the position C in . According to some embodiments of the present application, along the second direction Y, one side of the first insulating member 40 facing the first battery cell assembly 20 is partially recessed to form a second groove 411, and the second groove 411 communicates with the second through hole 41A and the first groove 1111.

[0162] The second groove 411 is a groove-shaped structure provided on one side of the first insulating member 40 facing the first battery cell assembly for guiding the electrolyte flowing out of the second through hole 41A to move towards the first groove 1111. Exemplarily, the second groove 411 can be integrally formed with the first insulating member 40 by stamping, extrusion, etc., or can be formed on the first insulating member 40 by turning and milling.

[0163] It can be understood that the extending direction of the second groove 411 should be parallel to the gravity direction Z.

[0164] In some embodiments, the first insulating member 40 includes a main body 41 and a convex portion 42; along the second direction Y, the main body 41 is located between the first battery cell assembly 20 and the first beam 13, and the main body 41 is provided with a second through hole 41A; the convex portion 42 protrudes from one side of the main body 41 facing the first side plate 131, the convex portion 42 is arranged around the second through hole 41A, and is located in the first through hole 13B, and one side of the main body 41 facing the first battery cell assembly 20 is partially recessed to form a second groove 411.

[0165] In some embodiments, one side of the main body 41 facing away from the first battery cell 21 is bonded or abutted against the first side plate 131. A part of one side of the main body 41 facing the first battery cell 21 is recessed to form a second groove 411, and another part of one side of the main body 41 facing the first battery cell 21 is bonded or abutted against the first wall 2111 to reduce the risk of electrolyte diffusion from the gap between the other part of one side of the main body 41 facing the first battery cell 21 and the first wall 2111.

[0166] In this embodiment, by partially recessing one side of the first insulating member 40 facing the first battery cell assembly 20 to form a second groove 411, and making the second groove 411 communicate with the second through hole 41A and the first groove 1111, it is convenient to guide the electrolyte that has not entered the second through hole 41A to move towards the first groove 1111 through the second groove 411 and be collected by the first groove 1111. Thus, the risk of electrolyte accumulation in the box 10 to submerge part of the first outer shell 211, resulting in a short circuit between the first battery cells 21 and / or between the first battery cell 21 and the box 10, is reduced, thereby improving the reliability of the battery device 100.

[0167] Refer toFigure 11 , and please refer to Figure 12 , according to some embodiments of the present application, the second groove 411 has a first end 411A and a second end 411B that are oppositely arranged in the gravity direction Z. The first end 411A communicates with the second through hole 41A, and the second end 411B communicates with the first groove 1111; the size of the first end 411A in the first direction X is greater than the maximum size of the second through hole 41A in the first direction X.

[0168] The first end 411A is the end where the second groove 411 communicates with the second through hole 41A, and the second end 411B is the end where the second groove 411 communicates with the first groove 1111.

[0169] In this embodiment, by making the size of the first end 411A in the first direction X greater than the maximum size of the second through hole 41A in the first direction X, it is convenient for the second groove 411 to better guide the electrolyte that has not entered the second through hole 41A to move towards the first groove 1111, thereby further improving the reliability of the battery device 100.

[0170] 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.

[0171] 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 when the first battery cell 21 undergoes thermal runaway, the risk of the first outer shell 211 and the first pressure relief mechanism 212 melting the first insulating member 40 and causing a short circuit between the first battery cell 21 and the first beam 13 is reduced, thereby further improving the reliability of the battery device 100.

[0172] Please refer to Figures 13 - 15 , Figure 13 is a schematic structural diagram of another battery device 100 provided by some embodiments of the present application, Figure 14 is an exploded view of the structure of the second battery cell 31 provided by some embodiments of the present application, Figure 15 is Figure 13A cross-sectional view of D-D. According to some embodiments of the present application, the battery device 100 further includes a second battery cell assembly 30; the second battery cell assembly 30 is disposed in the box body 10, and the bottom wall 111 bears the second battery cell assembly 30 along the gravity direction Z. 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; the second battery cell 31 includes a second outer shell 311 and a second pressure relief mechanism 312. The second outer shell 311 has a second wall 3111 facing the first beam body 13, and the second pressure relief mechanism 312 is disposed on the second wall 3111; along the gravity direction Z, the positive projection of the second wall 3111 on the bottom wall 111 falls into the first groove 1111; on the side of the first beam body 13 facing the second battery cell assembly 30, a third through hole 13C communicating with the first collection chamber 13A is provided, and the third through hole 13C is disposed opposite to the second pressure relief mechanism 312.

[0173] The second outer shell 311 is a shell-like component for accommodating other structural components (such as the second electrode assembly 313) of the second battery cell 31. The second outer shell 311 can also be used to accommodate an electrolyte, such as an electrolyte solution. In some embodiments, an accommodation chamber is formed inside the second outer shell 311, and the accommodation chamber is used to accommodate the second electrode assembly 313.

[0174] The second wall 3111 is the wall portion of the second outer shell 311 facing the first beam body 13. Exemplarily, the thickness direction of the second wall 3111 can be parallel to the second direction Y.

[0175] In some embodiments, the second outer shell 311 includes a second housing 311A and a second cover plate 311B. The second housing 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 the wall portion of the second housing 311A opposite to the second cover plate 311B.

[0176] In an embodiment where the second electrode assembly 313 is a wound structure, the second direction Y can be parallel to the winding axis of the second electrode assembly 313.

[0177] 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 to enter the first collection chamber 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.

[0178] In some embodiments, one second pressure relief mechanism 312 corresponds to a plurality of third through holes 13C. Along the second direction Y, the positive projection of the second pressure relief mechanism 312 covers the plurality of third through holes 13C corresponding to it.

[0179] In some embodiments, a second pressure relief mechanism 312 corresponds to a third through hole 13C. Along the second direction Y, the orthographic projection of the second pressure relief mechanism 312 covers a corresponding third through hole 13C.

[0180] In some implementations, 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, and the second side plate 132 is located between the second battery cell assembly 30 and the first side plate 131. Along the gravity direction Z, the orthographic projection of the second side plate 132 on the bottom wall 111 falls within the first groove 1111, and the third through hole 13C penetrates through the second side plate 132.

[0181] In some embodiments, the battery device 100 further includes a second insulating member. Along the second direction Y, at least a part of the second insulating member is located between the second battery cell assembly 30 and the first beam body 13. The second insulating member is provided with a second through hole 41A, and the second through hole 41A communicates with the first through hole 13B.

[0182] In this embodiment, by the orthographic projection of the second wall 3111 on the bottom wall 111 falling within the first groove 1111 along the gravity direction Z, when the second pressure relief mechanism 312 is actuated due to thermal runaway of the second battery cell 31, part of the electrolyte discharged from the second pressure relief mechanism 312 can move along the second wall 3111 under the action of gravity to fall into the second groove 411, so that part of the electrolyte can be collected by the second groove 411. At the same time, by connecting the third through hole 13C with the first collection cavity 13A and correspondingly arranging the third through hole 13C and the second pressure relief mechanism 312, when the second pressure relief mechanism 312 is actuated due to thermal runaway of the second battery cell 31, part of the electrolyte discharged from the second pressure relief mechanism 312 can enter the first collection cavity 13A through the second through hole 41A to be collected by the first collection cavity 13A, thereby further reducing the risk of the electrolyte accumulating in the box body 10 to submerge part of the second outer shell 311, resulting in a short circuit between the second battery cells 31 and / or between the second battery cell 31 and the box body 10, and further improving the reliability of the battery device 100.

[0183] Please refer to Figures 13 - 15 , according to some embodiments of the present application, the box body 10 further includes two second beam bodies 14. The two second beam bodies 14 are spaced apart 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.

[0184] 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.

[0185] In some embodiments, the second beam body 14 may be a frame structure disposed around the edge of the bottom wall 111.

[0186] In some embodiments, the two wall portions of the first outer shell 211 oppositely disposed in the first direction X are the two wall portions with the largest area of the first outer shell 211, and the two wall portions of the second outer shell 311 oppositely disposed in the first direction X are the two wall portions with the largest area of the second outer shell 311. The first battery cell assembly 20 and the second battery cell assembly 30 are both disposed 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.

[0187] In some embodiments, the battery device 100 further includes a connecting member 15. 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 are spaced apart along the second direction Y. Exemplarily, the connecting member 15 may be a pull belt.

[0188] In this embodiment, by providing two second beam bodies 14 spaced apart in the first direction X and disposing 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.

[0189] Please refer to Figures 13 - 15 , 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.

[0190] 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.

[0191] In this embodiment, by providing a second collection chamber 14A inside the second beam body 14 and connecting the first collection chamber 13A with the second collection chamber 14A, on the one hand, the first collection chamber 13A can cooperate with the second collection chamber 14A to accommodate more electrolyte, thereby further reducing the risk that the electrolyte accumulates in the box body 10 to submerge part of the first outer shell 211, resulting in a short circuit between the first battery cells 21 and / or between the first battery cell 21 and the box body 10; on the other hand, the second collection chamber 14A can provide 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, thereby enhancing the reliability of the battery device 100 and the energy storage device 200 provided with the battery device 100.

[0192] According to some embodiments of the present application, refer to Figures 3 to 15As shown, an embodiment of the present application provides a battery device 100 including a box body 10 and a first battery cell assembly 20; the box body 10 includes a bottom wall 111 and a first beam body 13; the first battery cell assembly 20 is arranged in the box body 10, and the bottom wall 111 supports the first battery cell assembly 20 along the gravity direction Z. The first battery cell assembly 20 includes a plurality of first battery cells 21 arranged along the first direction X. The first beam body 13 is located on one side of the first battery cell assembly 20 along the second direction Y. The first direction X, the second direction Y and the gravity direction Z are perpendicular to each other; the first battery cell 21 includes a first outer shell 211 and a first pressure relief mechanism 212. The first outer shell 211 has a first wall 2111 facing the first beam body 13, and the first pressure relief mechanism 212 is provided on the first wall 2111; wherein, the side of the bottom wall 111 facing the first battery cell assembly 20 is partially recessed to form a first groove 1111, and along the gravity direction Z, the orthographic projection of the first wall 2111 on the bottom wall 111 falls into the first groove 1111. The first beam 13 has a first collection chamber 13A within it. A first through-hole 13B, communicating with the first collection chamber 13A, is provided on the side of the first beam 13 facing the first battery cell assembly 20. The first through-hole 13B is positioned opposite the first pressure relief mechanism 212. Along the second direction Y, the first beam 13 has a first side plate 131 and a second side plate 132 positioned 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 positioned between the first battery cell assembly 20 and the second side plate 132. Along the gravity direction Z, the orthographic projection of the first side plate 131 on the bottom wall 111 falls within the first groove 1111. 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 H 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 1 mm ≤ H ≤ 2 mm. The battery device 100 also includes a first insulating member 40. The first insulating member 40 includes a main body 41 and a protrusion 42. The main body 41 is positioned between the first battery cell assembly 20 and the first beam 13 along the second direction Y. The main body 41 is provided with a second through-hole 41A. The protrusion 42 protrudes from the side of the main body 41 facing the first side plate 131. The protrusion 42 surrounds the second through-hole 41A and is positioned within the first through-hole 13B. Along the second direction Y, the 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 side of the first insulating member 40 facing the first battery cell assembly 20 is partially recessed to form a second groove 411, which connects the second through-hole 41A with the first groove 1111. The second groove 411 has a first end 411A and a second end 411B arranged opposite to each other in the gravity direction Z, the first end 411A is connected to the second through hole 41A, and the second end 411B is connected to the first groove 1111; the size of the first end 411A in the first direction X is larger than the maximum size of the second through hole 41A in the first direction X.The first insulating member 40 is a mica plate, a rigid foam, or a composite ceramic sheet. The battery device 100 further includes a second battery cell assembly 30; the second battery cell assembly 30 is disposed in the box body 10, and the bottom wall 111 bears the second battery cell assembly 30 along the gravity direction Z. 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; the second battery cell 31 includes a second outer shell 311 and a second pressure relief mechanism 312. The second outer shell 311 has a second wall 3111 facing the first beam body 13, and the second pressure relief mechanism 312 is disposed on the second wall 3111; along the gravity direction Z, the orthographic projection of the second wall 3111 on the bottom wall 111 falls into the first groove 1111; on the side of the first beam body 13 facing the second battery cell assembly 30, a third through hole 13C communicating with the first collection chamber 13A is provided, and the third through hole 13C is disposed opposite to the second pressure relief mechanism 312. The box body 10 further includes two second beam bodies 14; 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 chamber 14A, and the first collection chamber 13A communicates with the second collection chamber 14A.

[0193] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other.

[0194] 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, the present application may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that, include: The box body comprises a bottom wall and a first beam body; a first battery cell assembly disposed in the box, the bottom wall supporting the first battery cell assembly along the direction of gravity, the first battery cell assembly comprising a plurality of first battery cells arranged along a first direction, the first beam being located on one side of the first battery cell assembly along a second direction, the first direction, the second direction, and the direction of gravity being perpendicular to each other; The first battery cell includes a first housing and a first pressure relief mechanism, the first housing has a first wall facing the first beam, and the first pressure relief mechanism is provided on the first wall; The side of the bottom wall facing the first battery cell assembly is partially recessed to form a first groove, and along the direction of gravity, the orthographic projection of the first wall on the bottom wall falls into the first groove.

2. The battery device according to claim 1, characterized in that, The first beam body has a first collecting cavity inside, and a first through hole communicating with the first collecting cavity is provided on a side of the first beam body facing the first battery cell assembly. The first through hole is arranged opposite to the first pressure relief mechanism.

3. The battery device according to claim 2, wherein Along the second direction, the first beam body has a first side plate and a second side plate that are oppositely arranged, the first collecting cavity is located between the first side plate and the second side plate, and the first side plate is located between the first battery monomer assembly and the second side plate; Along the direction of gravity, the orthographic projection of the first side plate on the bottom wall falls into the first groove.

4. 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.

5. The battery device according to claim 4, 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 H, which satisfies 1mm≤H≤2mm.

6. The battery device according to claim 3, wherein, The battery device further comprises: The first insulating member is at least partially located between the first battery cell assembly and the first beam along the second direction. The first insulating member is provided with a second through hole, which is connected to the first through hole.

7. The battery device according to claim 6, wherein The first insulating member comprises: a body, located between the first battery cell assembly and the first beam along the second direction, and provided with the second through hole; The convex portion protrudes from the side of the main body facing the first side plate, and the convex portion is arranged around the second through hole and is located in the first through hole.

8. The battery device according to claim 7, wherein, Along the second direction, the protrusion protrudes from a side of the first side plate facing away from the first battery cell assembly.

9. The battery device according to claim 6, wherein, Along the second direction, a side of the first insulating member facing the first battery cell assembly is partially recessed to form a second groove, and the second groove communicates with the second through hole and the first groove.

10. The battery device according to claim 9, wherein The second groove has a first end and a second end oppositely arranged in the gravity direction, the first end is communicated with the second through hole, and the second end is communicated with the first groove; A dimension of the first end in the first direction is greater than a maximum dimension of the second through hole in the first direction.

11. The battery device according to claim 6, characterized in that, The first insulating member is a mica board, a rigid foam or a composite ceramic sheet.

12. The battery device according to claim 2, wherein, The battery device further comprises: The second battery cell assembly is disposed within the box body. The bottom wall bears the second battery cell assembly in the direction of gravity. 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; The second battery cell includes a second housing and a second pressure relief mechanism. The second housing has a second wall facing the first beam, and the second pressure relief mechanism is disposed on the second wall; Along the direction of gravity, the orthographic projection of the second wall on the bottom wall falls within the first groove; On a side of the first beam facing the second battery cell assembly, a third through hole communicating with the first collection chamber is provided, and the third through hole is disposed opposite to the second pressure relief mechanism.

13. The battery device according to claim 12, characterized in that, The box body further includes: Two second beams, 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.

14. The battery device according to claim 13, wherein, The interior of the second beam has a second collection chamber, and the first collection chamber communicates with the second collection chamber.

15. An energy storage device, characterized in that, Comprising: The battery device according to any one of claims 1-14.

16. An energy storage system, characterized in that, Comprising: An energy storage converter device; The energy storage device according to claim 15, wherein the energy storage converter device is used for electrically connecting a power generation device and the energy storage device.

17. A charging network, characterized in that, Comprising: A charging pile; The energy storage device according to claim 15, wherein the energy storage device is used for supplying electric energy to the charging pile.

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