Battery device, battery module, power utilization device and energy storage device

Abstract

The utility model discloses a battery device, a battery module, a power utilization device and an energy storage device. The utility model discloses a battery device. Comprising at least one battery module and a box. A containing space is formed in the box body, and the battery module is located in the containing space. The battery module includes a frame including: side plates disposed in pairs in a first direction; the end plates are arranged in pairs in the second direction, the end plates are welded to the side plates, the end plates and at least one side plate are in positioning fit with the height direction of the box body in the first direction and the second direction, the first direction intersects with the second direction, and the plane where the first direction and the second direction are located intersects with the height direction of the box body. The end plate and the at least one side plate are in positioning fit with the height direction of the box body in the first direction and the second direction, positioning of the end plate and the side plates by the tool clamp can be reduced, the structure of the tool clamp is simpler, before welding, only the end plate and the side plates need to be fixed through the tool clamp, and therefore the complexity of the tool clamp is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery device, a battery module, a power utilization device and an energy storage device. BACKGROUND

[0002] The battery monomers in the battery device are fixed by the frame composed of the end plate and the side plate, and the end plate and the side plate are fixed by welding. In the welding process, a tooling fixture is needed to position and fix the end plate and the side plate, resulting in a complex tooling fixture structure. If the tooling fixture is not used, the positioning accuracy of the end plate and the side plate cannot be guaranteed in the welding process, and the product failure rate is high. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems, the present application provides a battery device, a battery module, a power utilization device and an energy storage device, which can improve the positioning accuracy of the end plate and the side plate without using a tooling fixture.

[0004] In a first aspect, the present application provides a battery device, comprising:

[0005] a box body, the inside of the box body having a containing space;

[0006] at least one battery module, the battery module being located in the containing space, the battery module comprising a frame and a battery monomer group, the frame having a containing cavity, the battery monomer group being located in the containing cavity, the frame comprising a side plate and an end plate, the battery monomer group being provided with the side plate on both sides along a first direction, the battery monomer group being provided with the end plate on both sides along a second direction, the battery monomer group comprising a plurality of battery monomers arranged along the first direction, the end plate being welded with the side plate, the end plate and at least one side plate being positioned and matched along the first direction, the second direction and the height direction of the box body, the first direction intersecting the second direction, the plane where the first direction and the second direction are located intersecting the height direction of the box body.

[0007] The positioning and matching of the end plate and the at least one side plate along the first direction, the second direction and the height direction of the box body can reduce the positioning of the tooling fixture on the end plate and the side plate, make the structure of the tooling fixture simpler, and only need to fix the end plate and the side plate by the tooling fixture before welding, thereby reducing the complexity of the tooling fixture.

[0008] In some embodiments, the at least one side plate comprises a first side plate, the first side plate comprising a body part and a connecting part, the body part being provided with the connecting part at both ends along the second direction, the end plate having a first positioning surface on the first side along the first direction, and the connecting part being positioned and matched with the first positioning surface along the first direction.

[0009] Thus, the connecting part and the first positioning surface abut to realize the positioning of the end plate and the side plate along the first direction, so as to improve the positioning accuracy of the end plate and the side plate along the first direction.

[0010] In some embodiments, the first side of the end plate has a positioning portion located at one side of the connecting portion along the height direction of the box body, the positioning portion is positioned and matched with the body portion along the second direction, and the positioning portion is positioned and matched with the connecting portion along the height direction of the box body.

[0011] Thus, the positioning portion can realize the positioning of the end plate and the side plate along the second direction and the height direction of the box body, so as to improve the welding precision of the end plate and the side plate during the welding process.

[0012] In some embodiments, the first welding seam extending along the height direction of the box body and the second welding seam extending along the second direction are arranged between the connecting portion and the end plate, the connecting portion and the body portion jointly define a reflow groove, at least part of the reflow groove is located on the first positioning surface along the first direction, and part of the second welding seam is located in the reflow groove.

[0013] During the welding process of the end plate and the side plate, the molten solder or filler material may, under the influence of a temperature gradient, flow back. The reflow groove can increase the reflow space during the welding process of the welding seam, thereby reducing the probability of the molten metal liquid overflowing the welding position during the welding process, so as to improve the welding quality.

[0014] In some embodiments, the first side plate is respectively provided with a reflow groove at both sides along the height direction of the box body.

[0015] Thus, the reflow space can be further increased during the welding process, so as to improve the welding quality.

[0016] In some embodiments, at least part of the reflow groove is located on the first positioning surface along the first direction.

[0017] When the molten solder or filler material flows back into the reflow groove, the first positioning surface can block the molten solder or filler material from overflowing, so as to improve the welding quality.

[0018] In some embodiments, the size of the connecting portion along the height direction of the box body is smaller than the size of the end plate along the height direction of the box body.

[0019] Thus, the reflow space can be provided for the solder or filler material during the welding process, so that part of the solder or filler material can flow back into the reflow groove, thereby improving the welding quality.

[0020] In some embodiments, the first positioning surface has a protrusion extending along the height direction of the box body, the protrusion is arranged in a spaced manner with the connecting portion along the second direction, and the first welding seam is welded between the protrusion and the connecting portion.

[0021] The protrusion is arranged in a spaced manner with the connecting portion, so that the first welding seam can be filled therein. Compared with the arrangement mode in which the protrusion abuts against the connecting portion, the width of the first welding seam filled can be increased, and the welding strength between the connecting portion and the end plate is higher.

[0022] In some embodiments, the side plates positioned and matched with the end plates along the second direction and the height direction of the box are first side plates, the number of the battery modules is a plurality, and the plurality of battery modules are arranged along the first direction. The opposite side plates of the two adjacent battery modules are first side plates.

[0023] The opposite side plates of the two adjacent battery modules are first side plates, which can improve the stability of the plurality of frames as a whole, make the frame more resistant to impact, and enable the battery cell assembly in the frame to work more stably.

[0024] In some embodiments, the number of the battery cell groups is a plurality, and the plurality of battery cell groups are arranged along the first direction. One first side plate is arranged between the two adjacent battery cell groups.

[0025] In this way, one first side plate can be shared between the two battery cell groups, and compared with the mode of arranging two first side plates between the two battery cell groups, the number of first side plates used can be saved, thereby reducing the cost.

[0026] In some embodiments, the two adjacent end plates of the two adjacent battery modules are welded.

[0027] The end plates of the two adjacent frames are welded, which can make the plurality of frames form an integral structure, so that the frame is more firm and resistant to impact, thereby better protecting the battery cell assembly in the frame.

[0028] In a second aspect, the present application provides a battery module, comprising a frame and a battery cell group, the frame having a containing cavity, and the battery cell group being located in the containing cavity. The frame comprises:

[0029] The side plates arranged in pairs along the first direction, and the battery cell group is respectively provided with the side plates on both sides along the first direction.

[0030] The end plates arranged in pairs along the second direction, and the battery cell group is respectively provided with the end plates on both sides along the second direction. The end plates are welded with the side plates. The end plates and at least one side plate are positioned and matched along the first direction, along the second direction, and along the height direction of the box. The first direction intersects the second direction, and the plane where the first direction and the second direction are located intersects the height direction of the box.

[0031] The end plates and at least one side plate are positioned and matched along the first direction, along the second direction, and along the height direction of the box, which can reduce the positioning of the end plates and the side plates by the tooling fixture, make the structure of the tooling fixture simpler, and only need to fix the end plates and the side plates by the tooling fixture before welding, thereby reducing the complexity of the tooling fixture.

[0032] In some embodiments, the at least one side plate comprises a first side plate, the first side plate comprises a body part and a connecting part, the body part is provided with the connecting part at both ends along the second direction, the end plate is provided with a first positioning surface on the first side along the first direction, and the connecting part is positioned and matched with the first positioning surface along the first direction.

[0033] Thus, the connecting part and the first positioning surface abut to realize the positioning of the end plate and the side plate along the first direction, so as to improve the positioning accuracy of the end plate and the side plate along the first direction.

[0034] In some embodiments, the first side of the end plate is provided with a positioning part, the positioning part is located on one side of the connecting part along the height direction of the cabinet, the positioning part is positioned and matched with the body part along the second direction, and the positioning part is positioned and matched with the connecting part along the height direction of the cabinet.

[0035] Thus, the positioning part can realize the positioning of the end plate and the side plate along the second direction and the height direction of the cabinet, so as to improve the welding accuracy of the end plate and the side plate during welding.

[0036] In some embodiments, the connecting part and the end plate are provided with a first welding seam extending along the height direction of the cabinet and a second welding seam extending along the second direction, the connecting part and the body part jointly define a reflow groove, and part of the second welding seam is located in the reflow groove.

[0037] During the welding of the end plate and the side plate, the molten solder or filler metal may, under the influence of a temperature gradient, produce a reflow phenomenon, the reflow groove can increase the reflow area during the welding of the welding seam, thereby reducing the probability of the molten metal liquid overflowing the welding position during welding, so as to improve the welding quality.

[0038] In a third aspect, the present application provides a power utilization device comprising the battery device of the first aspect, and the battery device is used to provide electric energy to the power utilization device.

[0039] Since the power utilization device comprises all the technical features of the battery device of the first aspect, the effects are the same as described above, and will not be repeated here.

[0040] In a fourth aspect, the present application provides an energy storage device comprising a cabinet body and a battery cluster, the battery cluster is contained in the cabinet body, and the battery cluster comprises a plurality of battery devices of the first aspect.

[0041] Since the energy storage device comprises all the technical features of the battery device of the first aspect, the effects are the same as described above, and will not be repeated here.

[0042] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0043] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is made with reference to the accompanying drawings.

[0044] Figure 1 An exploded view of a battery device according to an embodiment of the present application;

[0045] Figure 2 A structure view of an electric device according to an embodiment of the present application, which is a vehicle;

[0046] Figure 3 An exploded view of a battery cell according to an embodiment of the present application;

[0047] Figure 4 An exploded view of a battery module according to an embodiment of the present application;

[0048] Figure 5 An isometric view of a battery module according to an embodiment of the present application before welding of a frame;

[0049] Figure 6 A partial enlarged view of I of Figure 5

[0050] Figure 7 A partial structure view of a battery module according to an embodiment of the present application, in which an end plate and a side plate are welded;

[0051] Figure 8 An isometric view of an energy storage device according to an embodiment of the present application.

[0052] Reference signs in the detailed description of the embodiments are as follows:

[0053] 1000, vehicle;

[0054] 100, battery device;

[0055] 10, battery module; 11, frame; 111, end plate; 1111, first positioning surface; 1112, positioning portion; 1113, protrusion; 112, side plate; 1121, body portion; 1122, connecting portion; 1123, backflow groove; 113, first weld; 114, second weld; 20, battery cell; 21, housing; 211, case; 212, end cover; 2121, electrode terminal; 2122, pressure relief mechanism; 22, electrode assembly; 23, current collecting member; 30, box; 31, first box; 32, second box;

[0056] ​2000, energy storage device; 2100, cabinet body; 2200, battery cluster;

[0057] X, first direction; Y, second direction; Z, height direction. DETAILED DESCRIPTION

[0058] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0060] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly and specifically limited.

[0061] In this paper, the reference to "embodiments" means that the specific features, structures or properties described in conjunction with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0062] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents a "or" relationship between the front and rear associated objects.

[0063] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0064] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are merely for the convenience of describing the embodiments of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0065] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mount", "connect", "connect", "fix" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0066] At present, the battery monomers in the battery device are fixed by the frame composed of the end plate and the side plate, and the end plate and the side plate are fixed by welding. In the welding process, the tooling fixture is needed for positioning and fixing between the end plate and the side plate, resulting in a complex tooling fixture structure. If the tooling fixture is not used, the positioning accuracy of the end plate and the side plate cannot be guaranteed in the welding process, and the product failure rate is high.

[0067] In view of this, the present application provides a battery device, the end plate and the at least one side plate are positioned and matched along the first direction, along the second direction and the height direction of the box body, which can reduce the positioning of the tooling fixture on the end plate and the side plate, make the structure of the tooling fixture simpler, and only need to fix the end plate and the side plate by the tooling fixture before welding, thereby reducing the complexity of the tooling fixture.

[0068] The battery device (Battery Apparatus) mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) can include a plurality of battery monomers, and the plurality of battery monomers are connected in series, in parallel or in a hybrid manner through a busbar component.

[0069] In some embodiments, referring to Figure 1 , the battery device 100 can be a battery pack, and the battery pack includes a box body 30 and one or more battery modules 10, and the battery modules 10 are accommodated in the box body 30.

[0070] As an example, refer to Figure 1 The box 30 can include a first box 31 and a second box 32. The first box 31 and the second box 32 are buckled so that a closed containing space is formed inside the box 30 to contain the battery module 10. The closed here means covered or closed, which can be sealed or unsealed. The first box 31 can be a top cover or a bottom plate.

[0071] As an example, the box can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that a closed space is formed inside the box to accommodate the battery module.

[0072] In some embodiments, refer to Figure 2 The box can be part of the chassis structure of the vehicle 1000. For example, part of the box can be at least part of the floor of the vehicle 1000, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0073] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0074] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0075] Refer to Figure 3 The battery cell 20 generally includes an electrode assembly 22. The electrode assembly 22 includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell 20, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0076] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0077] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metal, alloy, surface-treated metal can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver, etc. The composite current collector can include a high polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0078] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0079] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0080] As an example, the negative electrode active material can employ a negative electrode active material for a battery cell 20 known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative electrode active material for a battery cell 20 can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0081] In some embodiments, the negative electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is used as a negative electrode sheet, the surface of the foamed metal can not be provided with a negative electrode active material, or can be provided with a negative electrode active material.

[0082] As an example, the negative electrode active material can be filled or / and deposited in the negative electrode current collector.

[0083] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0084] In some embodiments, the electrode assembly 22 further includes a separator disposed between the positive electrode and the negative electrode.

[0085] In some embodiments, the separator is a separator film. The type of the separator film is not particularly limited, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0086] As an example, 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, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive electrode and the negative electrode, or can be attached to the surface of the positive electrode and the negative electrode. An inorganic particle coating layer, an organic particle coating layer, or an organic / inorganic composite coating layer can be applied to the surface of the separator film.

[0087] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and to separate the positive electrode and the negative electrode.

[0088] In some embodiments, the battery cell 20 further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The type of electrolyte is not particularly limited in the present application, and can be selected as desired. The electrolyte can be liquid, gel, or solid.

[0089] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0090] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro oxalato borate, lithium difluoro oxalato borate, lithium difluoro dioxalato phosphate, and lithium tetrafluoro oxalato phosphate.

[0091] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyrosulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and a crown ether.

[0092] In some embodiments, the electrolyte solution can optionally include an additive. For example, the additive can include a negative electrode film-forming additive, a positive electrode film-forming additive, an additive that improves certain properties of the battery cell 20, such as an additive that improves overcharge / rapid charge properties of the battery cell 20, an additive that improves high-temperature properties of the battery cell 20, an additive that improves low-temperature properties of the battery cell 20, and the like.

[0093] In some embodiments, the gel electrolyte includes a polymer as a backbone network, and can be used in combination with an ionic liquid-lithium salt.

[0094] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, a composite solid-state electrolyte.

[0095] As an example, the polymer of the polymer solid-state electrolyte can include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid, cellulose, etc.

[0096] As an example, the inorganic solid-state electrolyte can be one or more of oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), halide solid-state electrolyte, nitride solid-state electrolyte, and hydride solid-state electrolyte.

[0097] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0098] The electrode assembly 22 can be a wound structure, a stacked structure, or a hybrid structure of the wound and stacked structures.

[0099] In some embodiments, the electrode assembly 22 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0100] In some embodiments, the electrode assembly 22 is a stacked structure.

[0101] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0102] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0103] As an example, both the positive electrode sheet and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0104] As an example, a plurality of separators can be provided between any adjacent positive electrode sheets or negative electrode sheets.

[0105] As an example, the separators can be continuously provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0106] In some embodiments, the electrode assembly 22 can have a cylindrical shape, a flat shape, or a polygonal shape.

[0107] In some embodiments, the electrode assembly 22 is provided with tabs that can guide current out of the electrode assembly 22. The tabs include positive tabs and negative tabs.

[0108] In some embodiments, please refer to Figure 3The battery cell 20 can include a housing 21. The housing 21 can be a steel shell, an aluminum shell, a plastic shell (e.g., polypropylene), a composite metal shell (e.g., a copper-aluminum composite housing 21), or an aluminum-plastic film, etc. In some embodiments, the housing 21 can be a sealed structure or a non-sealed structure. As an example, when the housing 21 is a non-sealed structure, the housing 21 serves to protect the electrode assembly 22, and a sealing bag is further included between the housing 21 and the electrode assembly 22, which is used to encapsulate the electrode assembly 22 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing 21 is a sealed structure, it is used to encapsulate the electrode assembly 22 and the electrolyte, etc.

[0109] As an example, the battery cell 20 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell 20, or other shapes of battery cells, including a square battery cell, a blade battery cell, a multi-prismatic battery cell (e.g., a hexagonal battery cell), etc., without specific limitation in the present application.

[0110] In some embodiments, please refer to Figure 2 The housing 21 includes an end cover 212 and a shell 211, and the shell 211 is provided with an opening, and the end cover 212 is provided on the opening. The shell 211 can be provided with one or more openings. The end cover 212 can also be provided with one or more openings.

[0111] In some embodiments, at least one electrode terminal 2121 is provided on the housing 21, and the electrode terminal 2121 is electrically connected to the tab. The electrode terminal 2121 can be directly connected to the tab or indirectly connected to the tab through the current collecting member 23. The electrode terminal 2121 can be provided on the end cover 212 or on the shell 211.

[0112] In some embodiments, please refer to Figure 2 A pressure relief mechanism 2122 is provided on the housing 21. The pressure relief mechanism 2122 is used to discharge the internal gas of the battery cell 20.

[0113] As an example, the pressure relief mechanism 2122 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism 2122 performs an action or a weak structure provided in the pressure relief mechanism 2122 is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold value is designed differently according to different design requirements. The threshold value can depend on the material of one or more of the positive plate, the negative plate, the electrolyte, and the separator in the battery cell 20.

[0114] As an example, the pressure relief mechanism 2122 can be integrally formed with the housing 21.

[0115] As an example, the pressure relief mechanism 2122 can also be provided separately from the housing 21 and connected thereto.

[0116] "Actuation" as referred to in the present application means that the pressure relief mechanism 2122 is activated to a certain state so that the internal pressure and temperature of the battery cell 20 can be released. The action of the pressure relief mechanism 2122 can include but is not limited to: the movement of the components in the pressure relief mechanism 2122 to form an exhaust passage, the rupture of at least a part of the pressure relief mechanism 2122, the breaking, tearing or opening of at least a part of the pressure relief mechanism 2122, etc. When the pressure relief mechanism 2122 is actuated, the high-temperature and high-pressure substances inside the battery cell 20 are discharged as exhaust from the actuated part. In this way, the battery cell 20 can be depressurized and cooled at a controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0117] In some embodiments, when the housing 21 is a non-sealed structure, the pressure relief mechanism 2122 can be provided as a through hole for discharging the gas inside the battery cell 20.

[0118] The exhaust from the battery cell 20 as referred to in the present application includes but is not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of separators, high-temperature and high-pressure gases generated by reactions, flames, etc.

[0119] The technical solutions described in the embodiments of the present application are applicable to various electric devices using the battery cell 20, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles 1000, ships and spacecraft, etc. For example, the spacecraft includes airplanes, rockets, space shuttles and spacecraft, etc.

[0120] The following embodiments are described with reference to Figure 1 , Figures 4-7 for example, a battery device according to some embodiments of the present application.

[0121] The battery device includes a box 30 and at least one battery module 10. The box 30 has an accommodation space inside. The battery module 10 is located in the accommodation space, and the battery module 10 includes a frame 11 and a battery cell group. The frame 11 has an accommodation cavity, and the battery cell group is located in the accommodation cavity. The frame 11 includes side plates 112 and end plates 111. The battery cell group is respectively provided with the side plates 112 on both sides along a first direction X, and the battery cell group is respectively provided with the end plates 111 on both sides along a second direction Y. The battery cell group includes a plurality of battery cells 20 arranged along the first direction X. The end plates 111 are welded to the side plates 112. The end plates 111 and at least one side plate 112 are positioned and matched along the first direction X, the second direction Y and a height direction Z of the box 30. The first direction X intersects the second direction Y, and a plane on which the first direction X and the second direction Y lie intersects the height direction Z of the box 30.

[0122] In the process of manufacturing the side plate 112 and the end plate 111, a positioning groove can be arranged on the side of the end plate 111 facing the side plate 112, and the positioning groove and the side plate 112 are positioned and matched to limit the movement of the side plate 112 relative to the end plate 111 along the first direction X, the second direction Y and the height direction Z of the box body 30. So that the side plate 112 is in the predetermined position of the end plate 111, and then welded to improve the welding quality of the end plate 111 and the side plate 112.

[0123] For example, the end plate 111 is positioned and matched with the two side plates 112 along the first direction X, the second direction Y and the height direction Z of the box body 30. The structure of the two side plates 112 welded with the end plate 111 can be the same or different. The structure of the two end plates 111 can be the same or different.

[0124] The battery module 10 further comprises a plurality of battery cells 20, and the frame 11 has a cavity for accommodating the plurality of battery cells 20, and the plurality of battery cells 20 are arranged in the cavity.

[0125] The end plate 111 and the at least one side plate 112 are positioned and matched along the first direction X, the second direction Y and the height direction Z of the box body 30, which can reduce the positioning of the end plate 111 and the side plate 112 by the tooling fixture, make the structure of the tooling fixture simpler, and only need to fix the end plate 111 and the side plate 112 by the tooling fixture before welding, thereby reducing the complexity of the tooling fixture.

[0126] In some embodiments, please refer to Figure 6 The at least one side plate 112 comprises a first side plate, and the first side plate 112 comprises a body part 1121 and a connecting part 1122, the two ends of the body part 1121 are respectively provided with the connecting part 1122, the first side of the end plate 111 has a first positioning surface 1111, and the connecting part 1122 is positioned and matched with the first positioning surface 1111 along the first direction X.

[0127] For example, a gap along the second direction Y is arranged between the connecting part 1122 and the end plate 111 before the side plate 112 is welded with the end plate 111, so that the gap can be filled with welding and a welding seam is formed during welding.

[0128] The connecting part 1122 and the body part 1121 can be fixed by welding or one-piece forming.

[0129] Therefore, the connecting part 1122 and the first positioning surface 1111 abut to realize the positioning of the end plate 111 and the side plate 112 along the first direction X, so as to improve the positioning accuracy of the end plate 111 and the side plate 112 along the first direction X.

[0130] In some embodiments, please refer to Figure 6The first side of the end plate 111 has a positioning portion 1112 located at one side of the connecting portion 1122 along the height direction Z of the box 30, the positioning portion 1112 is positioned and matched with the body portion 1121 along the second direction Y, and the positioning portion 1112 is positioned and matched with the connecting portion 1122 along the height direction Z of the box 30.

[0131] As an example, the positioning portion 1112 can be, but is not limited to, a positioning protrusion provided on the first positioning surface 1111 and extending along the second direction Y, the end of the positioning protrusion is positioned and matched with the body portion 1121 along the second direction Y, and the positioning protrusion is positioned and matched with the connecting portion 1122 along the height direction Z of the box 30. As an example, a welding seam is formed between the positioning protrusion and the connecting portion 1122. The positioning protrusion can be provided on any side of the connecting portion 1122 along the height direction Z of the box 30.

[0132] Therefore, the positioning portion 1112 can realize the positioning of the end plate 111 and the side plate 112 along the second direction Y and the height direction Z of the box 30, so as to improve the welding precision of the end plate 111 and the side plate 112 during welding.

[0133] In some embodiments, referring to Figure 7 The connecting portion 1122 and the end plate 111 are connected by the first welding seam 113 extending along the height direction Z of the box 30 and the second welding seam 114 extending along the second direction Y, the connecting portion 1122 and the body portion 1121 jointly define a reflow groove 1123, and part of the second welding seam 114 is located in the reflow groove 1123.

[0134] The first side plate 112 can be provided with the reflow groove 1123 along one side of the height direction Z of the box 30, or the first side plate 112 can be provided with the reflow groove 1123 along both sides of the height direction Z of the box 30.

[0135] The shape of the reflow groove 1123 is not limited, for example, the contour shape of the reflow groove 1123 can be U-shaped or square-shaped.

[0136] Before welding, a channel for molten solder or flux is provided between the connecting portion 1122 and the surface of the end plate 111 along the height direction Z of the box 30, so that the solder or flux can flow into the reflow groove 1123 when it is reflowed.

[0137] During the welding of the end plate 111 and the side plate 112, the solder or flux will reflow in a molten state due to the temperature gradient, and the reflow groove 1123 can increase the reflow space during the welding of the welding seam, thereby reducing the probability of molten metal overflowing the welding position during welding, so as to improve the welding quality.

[0138] In some embodiments, the first side plate is provided with a reflow groove 1123 on both sides along the height direction Z of the box body 30.

[0139] In this way, the reflow space can be further increased during welding to improve the welding quality.

[0140] In some embodiments, the projection of at least part of the reflow groove 1123 along the first direction X is located on the first positioning surface 1111.

[0141] For example, the projection of the reflow groove 1123 along the first direction X can be entirely located on the first positioning surface 1111, or part of the projection can be located on the first positioning surface 1111.

[0142] When the solder or the melting material is in a molten state and flows into the reflow groove 1123, the first positioning surface 1111 can block the molten solder or the molten material from overflowing, thereby improving the welding quality.

[0143] In some embodiments, referring to Figure 6 The size of the connecting portion 1122 along the height direction Z of the box body 30 is smaller than the size of the end plate 111 along the height direction Z of the box body 30.

[0144] The size of the connecting portion 1122 along the height direction Z of the box body 30 is H1, and the size of the end plate 111 along the height direction Z of the box body 30 is H2, H1 is smaller than H2.

[0145] In this way, the reflow space can be provided for the solder or the melting material during welding, so that part of the solder or the melting material can flow into the reflow groove 1123, thereby improving the welding quality.

[0146] In some embodiments, referring to Figure 6 The first positioning surface 1111 has a protrusion 1113 extending along the height direction Z of the box body 30, the protrusion 1113 is spaced apart from the connecting portion 1122 along the second direction Y, and the first weld 113 is welded between the protrusion 1113 and the connecting portion 1122.

[0147] The length of the protrusion 1113 can be slightly smaller than the height of the end plate 111. For example, the length of the protrusion 1113 is 3-8 mm smaller than the height of the end plate 111, which can be determined according to the size of the end plate 111 and the first side plate.

[0148] The protrusion 1113 is spaced apart from the connecting portion 1122, so that the first weld 113 can fill the space therebetween. Compared with the abutting arrangement of the protrusion 1113 and the connecting portion 1122, the width of the first weld 113 filled can be increased, and the welding strength between the connecting portion 1122 and the end plate 111 is higher.

[0149] In some embodiments, the number of battery cell groups is multiple, and the multiple battery cell groups are arranged along the first direction X, and one first side plate is arranged between two adjacent battery cell groups.

[0150] In this way, one first side plate is shared between two battery cell groups, compared with the mode that two first side plates are arranged between two battery cell groups, the number of first side plates used can be saved, so as to reduce the cost.

[0151] In some embodiments, the number of battery modules 10 is multiple, and the multiple battery modules 10 are arranged along the first direction X, and the opposite side plates 112 of two adjacent battery modules 10 are first side plates 112.

[0152] The opposite side plates 112 of two adjacent battery modules 10 are first side plates 112, which can improve the stability of the multiple frames 11 as a whole, make the frame 11 more impact-resistant, and enable the battery cell 20 assembly in the frame 11 to work more stably.

[0153] In some embodiments, between two adjacent battery modules 10, the third weld extending along the height direction Z of the box 30 is welded between the two adjacent end plates 111.

[0154] For example, before welding, a bevel can be arranged between the two adjacent end plates 111 to improve the welding strength during welding.

[0155] The end plates 111 of two adjacent frames 11 are welded, which can make the multiple frames 11 form a whole structure, so that the frame 11 is more firm and impact-resistant, thereby better protecting the battery cell 20 assembly in the frame 11.

[0156] The following embodiments are described with reference to Figures 4-6 A battery module 10 according to some embodiments of the present application is taken as an example for description.

[0157] The battery module 10 can be the structure of the battery module 10 in the battery device of the above embodiments. Specifically, the battery module 10 includes a frame 11 and a battery cell 20 assembly, the frame 11 has an accommodation space, the battery cell 20 assembly is located in the accommodation space, and the frame 11 includes side plates 112 arranged in pairs along a first direction X and end plates 111 arranged in pairs along a second direction Y. The end plates 111 are welded with the side plates 112, and the end plates 111 and at least one side plate 112 are positioned and matched along the first direction X, along the second direction Y, and along the height direction Z of the box 30. The first direction X intersects the second direction Y, and the plane where the first direction X and the second direction Y are located intersects the height direction Z of the box 30.

[0158] The end plate 111 and the at least one side plate 112 are positioned and fitted along the first direction X, the second direction Y and the height direction Z of the box 30, which can reduce the positioning of the end plate 111 and the side plate 112 by the tooling fixture, make the structure of the tooling fixture simpler, and only need to fix the end plate 111 and the side plate 112 by the tooling fixture before welding, thereby reducing the complexity of the tooling fixture.

[0159] In some embodiments, the at least one side plate 112 includes a first side plate, the first side plate 112 includes a body part 1121 and a connecting part 1122, both ends of the body part 1121 are respectively provided with the connecting part 1122, the first side of the end plate 111 has a first positioning surface 1111, and the connecting part 1122 is positioned and fitted with the first positioning surface 1111 along the first direction X.

[0160] Therefore, the connecting part 1122 and the first positioning surface 1111 abut to realize the positioning of the end plate 111 and the side plate 112 along the first direction X, so as to improve the positioning accuracy of the end plate 111 and the side plate 112 along the first direction X.

[0161] In some embodiments, the first side of the end plate 111 has a positioning part 1112, the positioning part 1112 is located on one side of the connecting part 1122 along the height direction Z of the box 30, the positioning part 1112 is positioned and fitted with the body part 1121 along the second direction Y, and the positioning part 1112 is positioned and fitted with the connecting part 1122 along the height direction Z of the box 30.

[0162] Therefore, the positioning part 1112 can realize the positioning of the end plate 111 and the side plate 112 along the second direction Y and the height direction Z of the box 30, so as to improve the welding accuracy of the end plate 111 and the side plate 112 during welding.

[0163] In some embodiments, the connecting part 1122 and the end plate 111 are provided with a first welding seam 113 extending along the height direction Z of the box 30 and a second welding seam 114 extending along the second direction Y, the connecting part 1122 and the body part 1121 jointly define a reflow groove 1123, and part of the second welding seam 114 is located in the reflow groove 1123.

[0164] During the welding process of the end plate 111 and the side plate 112, the solder or the molten material in the molten state will produce a reflow phenomenon under the influence of the temperature gradient, the reflow groove 1123 can increase the reflow area during the welding process of the welding seam, thereby reducing the probability of the molten metal liquid overflowing the welding position during the welding process, so as to improve the welding quality.

[0165] The following embodiments are described by taking a power utilization device in some embodiments of the present application as an example for convenience of description.

[0166] The power consuming device includes the battery device 100 of the above embodiments, and the battery device 100 is used to provide electric energy to the power consuming device.

[0167] Due to the all technical features of the power consuming device including the battery device 100 of the above embodiments, the effects are the same as above, and will not be repeated here.

[0168] The following embodiments are for the convenience of description, please refer to Figure 8 The energy storage device 2000 of some embodiments of the present application is taken as an example for description.

[0169] The energy storage device 2000 includes a cabinet 2100 and a battery cluster 2200, the battery cluster 2200 is contained in the cabinet 2100, and the battery cluster 2200 includes a plurality of battery devices 100 of the above embodiments.

[0170] Due to the all technical features of the power consuming device including the battery device 100 of the above embodiments, the effects are the same as above, and will not be repeated here.

[0171] The battery cluster 2200 can improve the voltage and capacity of the energy storage device 2000. The battery cluster 2200 can include a plurality of battery devices 100. The plurality of battery devices 100 are connected in series through the busbar components to improve the voltage of the energy storage device 2000. When the energy storage device 2000 includes a plurality of battery clusters 2200, the plurality of battery clusters 2200 are connected in parallel to improve the capacity of the energy storage device 2000.

[0172] The energy storage device 2000 can be used in energy storage power stations, wind power systems, solar power systems, mobile power systems or temporary power supply systems, etc. The energy storage device 2000 can store electric energy as needed and output electric energy at appropriate times. For example, the energy storage device 2000 can store electric energy during the low valley of electricity consumption, and provide electric energy for related users or power consuming equipment during the peak of electricity consumption. The energy storage system provided by the embodiments of the present application can be any power system that needs to use the energy storage device 2000.

[0173] In some embodiments, the energy storage device 2000 is an energy storage container or an energy storage cabinet.

[0174] In an optional embodiment of the present application, please refer to Figure 1 , Figures 4-7The battery device 100 comprises a box body 30 and at least one battery module 10. The box body 30 has an accommodating space in the interior. The battery module 10 is located in the accommodating space, the battery module 10 comprises a frame 11 and a battery cell group, the frame 11 has an accommodating cavity, the battery cell group is located in the accommodating cavity, the frame 11 comprises side plates 112 and end plates 111, the battery cell group is respectively provided with the side plates 112 on both sides along a first direction X, the battery cell group is respectively provided with the end plates 111 on both sides along a second direction Y, the battery cell group comprises a plurality of battery cells 20 arranged along the first direction X, the end plates 111 are welded with the side plates 112, the end plates 111 and at least one side plate 112 are positioned and matched along the first direction X, the second direction Y and a height direction Z of the box body 30, the first direction X intersects with the second direction Y, and a plane where the first direction X and the second direction Y are located intersects with the height direction Z of the box body 30. At least one side plate 112 comprises a first side plate, the first side plate 112 comprises a body part 1121 and a connecting part 1122, both ends of the body part 1121 are respectively provided with the connecting part 1122, a first side of the end plate 111 has a first positioning surface 1111, the connecting part 1122 is positioned and matched with the first positioning surface 1111 along the first direction X. The first side of the end plate 111 has a positioning part 1112, along the height direction Z of the box body 30, the positioning part 1112 is located on one side of the connecting part 1122, the positioning part 1112 is positioned and matched with the body part 1121 along the second direction Y, and the positioning part 1112 is positioned and matched with the connecting part 1122 along the height direction Z of the box body 30. The connecting part 1122 and the end plate 111 are welded with a first welding seam 113 extending along the height direction Z of the box body 30 and a second welding seam 114 extending along the second direction Y, the connecting part 1122 and the body part 1121 jointly define a reflow groove 1123, and part of the second welding seam 114 is located in the reflow groove 1123. The size of the connecting part 1122 along the height direction Z of the box body 30 is smaller than the size of the end plate 111 along the height direction Z of the box body 30. The side plate 112 positioned and matched with the end plate 111 along the second direction Y and the height direction Z of the box body 30 is the first side plate 112, the number of the battery modules 10 is a plurality, the plurality of battery modules 10 are arranged along the first direction X, and the opposite side plates 112 in the adjacent two battery modules 10 are the first side plates 112. In the adjacent two battery modules 10, the third welding seam extending along the height direction Z of the box body 30 is welded between the adjacent two end plates 111.

[0175] The end plate 111 and the at least one side plate 112 are positioned and matched along the first direction X, the second direction Y and the height direction Z of the box body 30, which can reduce the positioning of the end plate 111 and the side plate 112 by the tool clamp, make the structure of the tool clamp simpler, and only need to fix the end plate 111 and the side plate 112 by the tool clamp before welding, thereby reducing the complexity of the tool clamp. Meanwhile, the reflow groove 1123 can accommodate the reflowing molten solder, so as to improve the welding quality.

[0176] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced equivalently. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery module comprises a frame and a battery cell group, the frame has a receiving cavity, and the battery cell group is located in the receiving cavity. The first side plate comprises a body part and a connecting part, two ends of the body part along the second direction are respectively provided with the connecting part, the end plate has a first positioning surface on the first side along the first direction, and the connecting part is positioned and matched with the first positioning surface along the first direction. The first side of the end plate has a positioning part, and the positioning part is located on one side of the connecting part along the height direction of the box.

2. The battery device according to claim 1, characterized by The connecting part and the end plate are provided with a first welding seam extending along the height direction of the box and a second welding seam extending along the second direction, and the connecting part and the body part jointly define a reflow groove, at least part of the projection of the reflow groove along the first direction is located on the first positioning surface, and part of the second welding seam is located in the reflow groove.

3. The battery device of claim 2, wherein, The size of the connecting part along the height direction of the box is smaller than the size of the end plate along the height direction of the box.

4. The battery device of claim 2, wherein The first side plate is provided with the reflow groove on both sides along the height direction of the box.

5. The battery device of claim 4, wherein, At least part of the projection of the reflow groove along the first direction is located on the first positioning surface.

6. The battery device of claim 4, wherein The first positioning surface has a protrusion extending along the height direction of the box, the protrusion is spaced apart from the connecting part along the second direction, and the first welding seam is welded between the protrusion and the connecting part.

7. The battery device of claim 4, wherein The number of the battery modules is multiple, multiple battery modules are arranged along the first direction, and the opposite side plates in the adjacent two battery modules are the first side plates.

8. The battery device of claim 4, wherein, The number of the battery cell groups is multiple, multiple battery cell groups are arranged along the first direction, and one first side plate is arranged between the adjacent two battery cell groups.

9. The battery device according to any one of claims 2 to 8, wherein The frame has a receiving cavity, and the battery cell group is located in the receiving cavity, and the frame comprises:

10. The battery device according to any one of claims 2 to 8, wherein The side plates are arranged in pairs along the first direction, and the battery cell group is respectively provided with the side plates on both sides along the first direction; 11. A battery module, characterized by ​ ​ The end plates are arranged in pairs along the second direction, and the battery cell groups are respectively provided with the end plates on both sides along the second direction. The end plates are welded with the side plates. The end plates and at least one side plate are positioned and matched along the first direction, along the second direction, and along the height direction of the box. The first direction intersects the second direction. The plane where the first direction and the second direction are located intersects the height direction of the box.

12. The battery module of claim 11, wherein, The at least one side plate comprises a first side plate, and the first side plate comprises a body part and a connecting part. The body part is respectively provided with the connecting part at both ends along the second direction. The end plate has a first positioning surface on the first side along the first direction. The connecting part is positioned and matched with the first positioning surface along the first direction.

13. The battery module of claim 12, wherein, The connecting part and the end plate are provided with a first welding seam extending along the height direction of the box and a second welding seam extending along the second direction. The connecting part and the body part jointly define a reflow groove. Part of the second welding seam is located in the reflow groove.

14. An electrical device, comprising: The battery device comprises the battery device according to any one of claims 1-10, and is used to provide electric energy for the electric device.

15. An energy storage device, characterized by, The cabinet comprises a cabinet body and a battery cluster. The battery cluster is accommodated in the cabinet body. The battery cluster comprises a plurality of battery devices according to any one of claims 1-10.

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