Battery device and energy storage device

Abstract

The embodiment of the application discloses a gasket structure, a battery device and an energy storage device, and relates to the battery field. The gasket structure comprises a first sub-gasket, a second sub-gasket, a connecting portion and a groove. The first sub-gasket comprises a first fixed region, the second sub-gasket comprises a second fixed region, the connecting portion is located between the first sub-gasket and the second sub-gasket and is electrically connected with the first sub-gasket and the second sub-gasket, and the groove is located between the first fixed region and the second fixed region. The possibility of stress concentration in the middle part of the gasket structure can be reduced, and the risk of damage of the gasket structure under the impact force can be reduced.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery structure, battery device, and energy storage device. Background Technology

[0002] Battery terminals are used to connect multiple battery cells to form a battery device. When a battery terminal is subjected to vibration and impact, stress concentrates in the center of the terminal. This stress concentration phenomenon can seriously affect the material and structure of the terminal, causing its performance to gradually decline and eventually leading to its failure, which in turn affects the normal operation of the entire battery device. Summary of the Invention

[0003] This application provides a flap structure, a battery device, and an energy storage device, which can reduce the possibility of stress concentration in the middle of the flap structure and reduce the risk of the flap structure being damaged by impact.

[0004] In a first aspect, this application provides a battery pack structure for a secondary battery, comprising: a first sub-battery pack including a first fixed region; a second sub-battery pack including a second fixed region; a connecting portion located between the first sub-battery pack and the second sub-battery pack and electrically connected to the first sub-battery pack and the second sub-battery pack; and a groove located between the first fixed region and the second fixed region.

[0005] In the technical solution of this application embodiment, a groove is provided between the first fixed area and the second fixed area. When the bar structure is subjected to vibration and impact, the groove can improve the stress distribution. The area around the groove will be subjected to tensile or bending stress, which will cause the stress to diffuse around the groove, thereby reducing the possibility of stress concentration in the middle of the bar structure and causing damage to the bar structure.

[0006] In some embodiments of the first aspect, the groove includes a central groove portion that spans the first sub-piece, the connecting portion, and the second sub-piece.

[0007] In this embodiment, the middle groove spans the first sub-piece, the connecting part, and the second sub-piece, dividing the connecting part into two parts. This prevents stress from being transmitted between the two parts of the connecting part, thereby avoiding stress concentration in the middle of the connecting part and instead dispersing it to the area around the middle groove.

[0008] In some embodiments of the first aspect, the intermediate groove extends along a first direction, wherein the first direction is parallel to the line connecting the centers of the first fixed region and the second fixed region.

[0009] In this embodiment, the extension direction of the middle groove is parallel to the line connecting the center of the first fixed area and the second fixed area, which can make the stress more evenly distributed inside the plate structure and avoid the phenomenon that the stress in one part of the connection is too large due to the inconsistent direction of force transmission.

[0010] In some embodiments of the first aspect, the groove includes a first groove portion located on the first sub-piece and / or a second groove portion located on the second sub-piece.

[0011] In this embodiment, the first groove is located on the first sub-piece, which can disperse the stress on the first sub-piece and avoid stress concentration on the first sub-piece; similarly, the second groove is located on the second sub-piece, which can disperse the stress on the second sub-piece and avoid stress concentration on the second sub-piece.

[0012] In some embodiments of the first aspect, the first groove portion surrounds the first fixing region and / or the second groove portion surrounds the second fixing region.

[0013] In this embodiment, the first groove and the second groove surround the first fixed area and the second fixed area respectively, which can increase the stress transmission path, so that the stress that was originally concentrated in a few directions or areas can be distributed to more paths and areas, thereby effectively reducing the stress concentration.

[0014] In some embodiments of the first aspect, the first groove and / or the second groove extend along a second direction, wherein the second direction is perpendicular to the line connecting the centers of the first fixed region and the second fixed region.

[0015] In this embodiment, the extension directions of the first groove and the second groove are perpendicular to the line connecting the centers of the first fixed region and the second fixed region. The stress will change its propagation direction along the shape of the first groove and / or the second groove, so that the stress can propagate to more dimensions, thereby effectively increasing the stress transmission path.

[0016] In some embodiments of the first aspect, the intermediate groove portion connects the first groove portion and / or the second groove portion.

[0017] In this embodiment, by connecting the first groove and / or the second groove through the intermediate groove, the function of the groove can be better utilized, so that the groove can both increase the stress transmission path and avoid stress concentration.

[0018] In some embodiments of the first aspect, the groove is axially symmetrical along a first direction, wherein the first direction is parallel to the line connecting the centers of the first fixed region and the second fixed region.

[0019] In this embodiment, the axial symmetry of the groove along the first direction allows the stress dispersion process to also exhibit symmetrical characteristics. Stress will propagate evenly to both sides along the symmetrical structure of the groove, preventing stress concentration on one side or in a localized area of ​​the plate structure.

[0020] In some embodiments of the first aspect, the groove passes through the center of the first fixed region and the second fixed region along the center line of the first direction.

[0021] In this embodiment, the center line of the groove along the first direction coincides with the center line connecting the first fixed area and the second fixed area. The stress will be transmitted and diffused evenly to both sides with the center line of the groove as the axis of symmetry, avoiding stress concentration on one side or in a local area, and reducing the risk of damage such as cracks and deformation of the plate structure due to stress concentration.

[0022] In some embodiments of the first aspect, the groove includes a first groove portion and a second groove portion, the groove being axially symmetrical along a second direction, wherein the second direction is perpendicular to the line connecting the centers of the first fixed region and the second fixed region.

[0023] In this embodiment, when the plate structure is subjected to vibration or impact and generates stress, the axisymmetric groove can make the stress dispersion process symmetrical, so that the stress dispersed to the first sub-plate and the second sub-plate is the same, reducing the uneven distribution of stress.

[0024] In some embodiments of the first aspect, the bar structure has a minimum flow dimension w, a thickness t, and a flow rate L satisfying: L≥5wt.

[0025] In this embodiment of the application, satisfying L≥5wt during current conduction ensures that the plate structure has sufficient conductivity to meet the current requirements under different operating conditions.

[0026] In some embodiments of the first aspect, the size of the intermediate groove portion along the second direction is greater than or equal to 2 mm and less than or equal to 10 mm, wherein the second direction is perpendicular to the line connecting the centers of the first fixed region and the second fixed region.

[0027] In this embodiment, the size of the middle groove portion along the second direction is in the range of 2mm to 10mm, which achieves a balance and coordination of various performance aspects such as stress transmission and distribution, current distribution, structural strength and processing technology.

[0028] In some embodiments of the first aspect, the angle of the first groove portion surrounding the first fixed region is greater than or equal to 20° and less than or equal to 100°; and / or the angle of the second groove portion surrounding the second fixed region is greater than or equal to 20° and less than or equal to 100°.

[0029] In this embodiment, the surrounding angle is set between 20° and 100°, which can extend the stress transmission path while satisfying the structural strength of the plate, and achieve a balance and coordination of multiple functions such as stress transmission and dispersion and current distribution.

[0030] In some embodiments of the first aspect, the groove extends through the plaster structure along a third direction, wherein the third direction is the thickness direction of the plaster structure.

[0031] In this embodiment of the application, when the plate structure is subjected to external vibration or impact and generates stress, the through groove can provide a path for stress transmission in the thickness direction, dispersing the stress to more areas.

[0032] In some embodiments of the first aspect, the plaque structure is asymmetrical along a first direction and / or a second direction, wherein the first direction is parallel to the line connecting the centers of the first fixed region and the second fixed region, and the second direction is perpendicular to the line connecting the centers of the first fixed region and the second fixed region.

[0033] In this embodiment, the asymmetry of the flap structure makes it difficult to install it backwards. That is, during installation, the correct installation direction can be identified, avoiding the situation where the flap structure is installed backwards.

[0034] In some embodiments of the first aspect, the flap structure further includes a first chamfer and a second chamfer, the size of the first chamfer being different from the size of the second chamfer.

[0035] In this embodiment of the application, by setting a chamfer, the correct installation direction of the flap structure can be quickly determined by observing the obvious size difference between the two chamfers when installing the flap structure.

[0036] In some embodiments of the first aspect, the bar structure further includes a first positioning hole on the first sub-bar and a second positioning hole on the second sub-bar.

[0037] In this embodiment, the first positioning hole and the second positioning hole play a positioning role during the assembly of the battery cell structure. When assembling the battery cell structure with other components, the position of the battery cell structure on the individual battery cell can be determined quickly and accurately, improving assembly efficiency.

[0038] Secondly, this application provides a battery device, including: a plurality of battery cells; a tab structure as described in the first aspect or any embodiment of the first aspect, wherein the tab structure is connected to the electrode terminals of two adjacent battery cells.

[0039] Thirdly, this application provides an energy storage device, including a battery device, which includes the battery device described in the second aspect, and the battery device is used to store or provide electrical energy.

[0040] Fourthly, this application provides an energy storage system, including a power conversion device and the energy storage device described in the third aspect, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0041] Fifthly, this application provides a charging network, including a charging pile and an energy storage device as described in the third aspect or an energy storage system as described in the fourth aspect, wherein the energy storage device is used to provide electrical energy to the charging pile. Attached Figure Description

[0042] Figure 1 This is a structural diagram of an energy storage container according to an embodiment of this application;

[0043] Figure 2 This is a structural diagram of the battery device according to an embodiment of this application;

[0044] Figure 3 This is a structural diagram of a battery cell according to an embodiment of this application;

[0045] Figure 4 This is an exploded view of a single battery cell according to an embodiment of this application;

[0046] Figure 5 This is a structural diagram of the plastron structure according to an embodiment of this application;

[0047] Figure 6 This is another structural diagram of the plastron structure according to an embodiment of this application;

[0048] Figure 7 This is a schematic diagram of the stress transfer path according to an embodiment of this application;

[0049] Figure 8 This is another structural diagram of the plaster structure according to an embodiment of this application;

[0050] Figure 9 This is another schematic diagram of the stress transfer path according to an embodiment of this application;

[0051] Figure 10 This is another structural diagram of the plastron structure according to an embodiment of this application;

[0052] Figure 11 This is another structural diagram of the plastron structure according to an embodiment of this application;

[0053] Figure 12 This is another structural diagram of the plaster structure according to an embodiment of this application;

[0054] Figure 13 This is another structural diagram of the plastron structure according to an embodiment of this application;

[0055] Figure 14 for Figure 13 Front view of the plastron structure shown;

[0056] Figure 15 This is another structural diagram of the plastron structure according to an embodiment of this application;

[0057] Figure 16 This is another structural diagram of the plastron structure according to an embodiment of this application;

[0058] Figure 17 This is another structural diagram of the plaster structure according to an embodiment of this application;

[0059] Figure 18 This is another structural diagram of the plastron structure according to an embodiment of this application;

[0060] Figure 19 This is another structural diagram of the battery device according to an embodiment of this application.

[0061] The accompanying drawings are not drawn to scale.

[0062] Figure label:

[0063] 1000 - Energy storage container; 100 - Battery unit; 10 - Battery housing; 101 - First housing section; 102 - Second housing section; 20 - Battery cell; 21 - Housing; 211 - Opening; 22 - End cap; 23 - Electrode terminal; 24 - Pressure relief mechanism; 25 - Electrode assembly; 251 - Tab; 30 - Bar structure; 31 - First sub-bar; 311 - First fixing area; 312 - First positioning hole; 32 - Second sub-bar; 321 - Second fixing area; 322 - Second positioning hole; 33 - Connecting part; 34 - Groove; 340 - Middle groove; 341 - First groove; 342 - Second groove; 351 - First chamfer; 352 - Second chamfer; 200 - Electrical cabinet. Detailed Implementation

[0064] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0065] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0066] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0067] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0068] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0069] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0070] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0071] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0072] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0073] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0074] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0075] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0076] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the occurrence of short circuits while allowing active ions to pass through.

[0077] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0078] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0079] As an example, the positive 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 metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0080] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0081] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0082] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0083] 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 metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0084] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0085] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0086] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0087] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0088] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0089] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0090] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0091] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0092] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0093] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0094] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0095] Liquid electrolytes include electrolyte salts and solvents.

[0096] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0097] In some embodiments, the solvent may 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, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may 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 crown ethers.

[0098] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0099] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0100] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0101] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0102] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium-germanium-phosphorus-sulfur, sulfosilium-germanium), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0103] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0104] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0105] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0106] In some implementations, the electrode assembly is a stacked structure.

[0107] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0108] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0109] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0110] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0111] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0112] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0113] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0114] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0115] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0116] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap disposed on the opening. The housing may have one or more openings. The end cap may also be provided one or more.

[0117] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0118] In some embodiments, a pressure relief mechanism is provided on the casing. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0119] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby creating an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0120] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0121] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0122] The term "actuation" as used in this application refers to the activation or actuation of the pressure relief mechanism to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the mechanism, etc. When the pressure relief mechanism is activated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the activated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby reducing the likelihood of potentially more serious accidents.

[0123] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for venting gas inside the battery cell.

[0124] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0125] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0126] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0127] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0128] In some embodiments, the battery device may be a battery pack, which includes a battery housing and one or more individual battery cells housed within the battery housing.

[0129] As an example, a battery cell assembly can be a battery module, which can be housed in a battery housing by fixing the battery module in the battery housing.

[0130] As an example, battery cell assemblies can also be housed in a battery housing by directly fixing multiple battery cells to the battery housing.

[0131] As an example, the battery housing may include a first battery housing and a second battery housing portion. The first battery housing portion and the second battery housing portion are fastened together to form a closed space inside the battery housing for housing individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first battery housing may be a top cover or a bottom plate.

[0132] As an example, the battery enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are respectively connected to the frame, so that the interior of the battery enclosure forms an enclosed space to house individual battery cells.

[0133] This application provides an energy storage device including one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0134] 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. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0135] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0136] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0137] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0138] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device via piping to regulate the temperature of the individual battery cells.

[0139] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0140] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0141] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0142] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0143] In some embodiments, the energy storage system may include one or more energy storage devices and a power converter system (PCS), with the power converter connecting between the power generation device and the energy storage device. The power generation device generates electrical energy, which can be stored in the energy storage device via the power converter. For example, the power generation device may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. The specific type of power generation device is not limited in this application.

[0144] This application provides a charging network including a charging pile and an energy storage device. The charging pile is electrically connected to the energy storage device, which provides power to the charging pile. The charging pile is electrically connected to a battery device in the energy storage device via a cable, and the battery device can provide its stored electrical energy to the charging pile. The charging pile has one or more connectors for connecting to electrical devices, thereby replenishing the power to the devices.

[0145] Energy storage devices can be located inside the charging pile (e.g., an integrated energy storage and charging unit) or outside the charging pile.

[0146] Battery terminals are used to connect multiple battery cells to form a battery device. When a battery terminal is subjected to vibration and impact, stress concentrates in the center of the terminal. This stress concentration phenomenon can seriously affect the material and structure of the terminal, causing its performance to gradually decline and eventually leading to its failure, which in turn affects the normal operation of the entire battery device.

[0147] Based on the above considerations, this application provides a flap structure, which includes a first sub-flap, a second sub-flap, a connecting portion, and a groove. The first sub-flap includes a first fixed region, the second sub-flap includes a second fixed region, the connecting portion is located between the first and second sub-flap and is electrically connected to both sub-flap, and the groove is located between the first and second fixed regions.

[0148] A groove is provided between the first fixed area and the second fixed area. When the bar structure is subjected to vibration and impact, the groove can improve the stress distribution. The area around the groove will be subjected to tensile or bending stress, which will cause the stress to diffuse around the groove, reducing the possibility of stress concentration in the middle of the bar structure and causing damage to the bar structure.

[0149] Figure 1 This is a structural diagram of an energy storage container according to an embodiment of this application. Figure 1 As shown, the energy storage container 1000 is a relatively highly integrated energy storage device. The interior of the energy storage container 1000 has a hollow structure, which can include multiple compartments, for example, to accommodate multiple electrical cabinets.

[0150] In some embodiments, the energy storage container 1000 may include a plurality of electrical cabinets 200, each of which may include a cabinet body and at least one electrical box.

[0151] The battery cabinet 200 is used to encapsulate one or more battery devices 100. Multiple battery devices 100 can be connected in parallel, in series, or in a series-parallel connection.

[0152] In some embodiments, the storage container may include a battery compartment for accommodating batteries. In addition, the interior of the energy storage container 1000 can be divided into multiple functional compartments according to actual needs. Each functional compartment is equipped with other functional equipment components for managing or assisting the operation of the multiple batteries, such as: a busbar component, a main control component, a thermal management component, etc.

[0153] In some embodiments, the thermal management component may include an air conditioning assembly, a fan assembly, water-cooled pipes, etc., which can be used to perform thermal management on the interior of the energy storage container 1000 to adjust the temperature inside the energy storage container 1000.

[0154] In some embodiments, the energy storage container 1000 may also include a fire protection system for fire protection treatment of the energy storage container 1000, such as alarm, cooling or fire extinguishing.

[0155] In some embodiments, the energy storage container 1000 can be a regular cuboid structure, which facilitates the fixed placement and transportation of the energy storage container 1000.

[0156] It should be understood that Figure 1 The components shown are merely examples. In practical applications, these components may have different names, or they may be modified according to actual needs. Figure 1 You can add or delete components in the system.

[0157] Figure 2 This is a structural diagram of a battery device according to an embodiment of this application. Figure 2 As shown, the battery device 100 of this application embodiment may include a plurality of battery cells 20 to meet different power usage needs. It should be understood that, as Figure 2 As shown, the battery device 100 in this embodiment may further include a battery housing 10.

[0158] The battery housing 10 may include two parts, referred to herein as a first housing part 101 and a second housing part 102, which are fastened together. The shapes of the first housing part 101 and the second housing part 102 may be determined according to the shape of the components housed inside, for example, according to the shape of the combination of multiple battery cells 20 housed inside. At least one of the first housing part 101 and the second housing part 102 has an opening. For example, the first housing part 101 and the second housing part 102 may both be hollow cuboids with one face as an opening. The openings of the first housing part 101 and the second housing part 102 are arranged opposite to each other, and the first housing part 101 and the second housing part 102 are fastened together to form a battery housing 10 with a closed cavity, which can be used to house multiple battery cells 20. Multiple battery cells 20 are connected in parallel, series, or mixed and placed inside the battery housing 10 formed by the fastening of the first housing part 101 and the second housing part 102.

[0159] For example, one of the first housing portion 101 and the second housing portion 102 may be a hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the second housing portion 102 as a hollow cuboid with one opening and the first housing portion 101 as a plate-shaped example, then the first housing portion 101 covers the opening of the second housing portion 102 to form a battery housing 10 with a closed chamber, which can be used to accommodate multiple battery cells 20.

[0160] Figure 3This is a structural diagram of a battery cell according to an embodiment of this application. Figure 4 This is an exploded view of a single battery cell according to an embodiment of this application. Figure 3 , Figure 4 As shown, the battery cell 20 in this embodiment may include a housing 21, an end cap 22, an electrode terminal 23, a pressure relief mechanism 24, and an electrode assembly 25.

[0161] The outer shell 21 is a hollow structure with an opening 211. The electrode assembly 25 is housed within the outer shell 21. The shape of the outer shell 21 can be determined according to the specific shape of the electrode assembly 25. For example, if the electrode assembly 25 is a cuboid structure, the outer shell 21 can also be a cuboid structure. Figure 3 and Figure 4 An exemplary case is shown where the housing 21 and electrode assembly 25 are square.

[0162] The outer shell 21 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc. This application embodiment does not limit this.

[0163] End cap 22 is used to seal opening 211 to form a sealed mounting space for accommodating electrode assembly 25. The mounting space is also used to accommodate electrolyte, such as electrolyte solution. Electrode terminals 23 are mounted on end cap 22 for connection to electrode assembly 25, i.e., electrode terminals 23 are connected to tabs 251 of electrode assembly 25.

[0164] The end cap 22 is also equipped with a pressure relief mechanism 24. When the internal pressure of the battery cell 20 rises abnormally, the pressure relief mechanism 24 can be activated in time to release the excessive pressure inside the battery cell 20, thereby reducing the possibility of dangerous situations such as the battery cell 20 exploding.

[0165] It should be understood that the shape of the battery cell 20 in this application embodiment can be flexibly set according to actual application, that is, the outer shell 21 of the battery cell 20 can be any polyhedral structure, for example, it can be set as a cuboid or a cylinder, etc.

[0166] Figure 5 This is a structural diagram of the plasmid structure according to an embodiment of this application. Figure 5 As shown, the battery pack structure 30 may include a first sub-battery 31, a second sub-battery 32, a connecting portion 33, and a groove 34. The first sub-battery 31 includes a first fixing region 311, the second sub-battery 32 includes a second fixing region 321, the connecting portion 33 is located between the first sub-battery 31 and the second sub-battery 32 and is electrically connected to both sub-battery 31 and the second sub-battery 32, and the groove 34 is located between the first fixing region 311 and the second fixing region 321. This battery pack structure 30 can be used in secondary batteries.

[0167] In this embodiment, the first fixed region 311 and the second fixed region 321 are connected to the electrode terminals 23 of the battery cell 20. The connection method may include laser welding, ultrasonic welding, crimping connection, and conductive adhesive connection, etc.

[0168] In this embodiment, the first fixed region 311 may be located at the center of the first sub-piece 31 or at other locations on the first sub-piece 31. This application does not limit the location.

[0169] In this embodiment of the application, the connecting part 33 connects the first sub-plate 31 and the second sub-plate 32 to form a continuous integral structure. The connecting part 33 enables the conduction of current between the first sub-plate 31 and the second sub-plate 32.

[0170] It should be understood that the connecting part 33 can be connected to the first sub-piece 31 and the second sub-piece 32 by means of welding, riveting or integral molding, etc., and this application does not limit it.

[0171] It should be understood that the material of the barplate structure 30 may include metallic materials, metal matrix composites, and conductive polymer composites, etc.

[0172] In this embodiment, when the flap structure 30 is subjected to vibration and impact, the stress wave generated by the impact will propagate within the flap structure 30. The stress is mainly transmitted from the first fixed region 311 and the second fixed region 321 to the connecting part 33 in the middle of the flap structure 30, easily forming a stress concentration point, causing local plastic deformation or damage to the flap structure 30, and thus causing the flap structure 30 to fail. The groove 34 located between the first fixed region 311 and the second fixed region 321 can improve the stress distribution. The groove 34 is subjected to tensile or bending stress around its perimeter, causing the stress to diffuse around the groove 34, avoiding stress concentration in the middle of the flap structure 30 and preventing damage to the flap structure 30.

[0173] It should be understood that when the impact force is too great and the flap structure 30 is bent and deformed, the groove 34 can also absorb some energy through its own deformation, reducing the degree of damage to the flap structure 30 caused by the impact, so that the flap structure 30 can still maintain the integrity and functionality of the structure after multiple impacts.

[0174] In addition, for ease of description, this application embodiment defines three reference directions based on the flap structure 30: the direction parallel to the line connecting the centers of the first fixed region 311 and the second fixed region 321 is the X direction, i.e., the first direction; the direction perpendicular to the line connecting the centers of the first fixed region 311 and the second fixed region 321 is the Y direction, i.e., the second direction; and the thickness direction of the flap structure 30 is the Z direction, i.e., the third direction. The X direction, Y direction and Z direction are perpendicular to each other, i.e., the first direction, the second direction and the third direction are perpendicular to each other.

[0175] In this embodiment of the application, the X direction may not be represented as the horizontal direction, and the Y direction may not be represented as the vertical direction.

[0176] In this embodiment, the groove 34 can be of various shapes or a combination of various shapes, which will be described below in conjunction with... Figures 6 to 10 Let me introduce it.

[0177] Figure 6 This is another structural diagram of the plaque structure according to an embodiment of this application. Figure 6 As shown, the groove 34 may include a middle groove portion 340, which spans the first sub-piece 31, the connecting portion 33 and the second sub-piece 32.

[0178] In this embodiment, the intermediate groove 340 spans the first sub-plate 31, the connecting portion 33, and the second sub-plate 32, dividing the connecting portion 33 into two parts along the Y direction. This prevents stress from being transmitted between the two parts of the connecting portion 33, thus avoiding stress concentration in the middle of the connecting portion 33 and instead dispersing it to the area surrounding the intermediate groove 340. This stress dispersion mechanism can reduce the risk of material fatigue, cracking, or even fracture caused by excessive local stress.

[0179] In this embodiment, the shape of the intermediate groove portion 340 can be elongated, arc-shaped, or curved, etc.

[0180] Figure 7 This is a schematic diagram of the stress transfer path according to an embodiment of this application. Figure 7 As shown, the dashed arrows represent the stress transmission path. When the plate structure 30 is subjected to vibration and impact, the stress is transmitted to the surrounding areas centered on the first fixed area 311 and the second fixed area 321. Since the middle groove 340 blocks the stress transmission path between the connecting parts 33, the stress will be transmitted along the Y direction and thus dispersed on the plate structure 30.

[0181] In this embodiment, the intermediate groove portion 340 can extend along a first direction, wherein the first direction is parallel to the center line connecting the first fixed region 311 and the second fixed region 321.

[0182] It should be understood that the cross-sectional shape of the intermediate groove portion 340 along the X direction can be elongated, including rectangular or similar rectangular shapes, and spans the first sub-piece 31, the connecting portion 33 and the second sub-piece 32.

[0183] It should be understood that the edges of the central groove portion 340 may be rounded or beveled, and this application does not limit this.

[0184] In this embodiment, the extension direction of the intermediate groove 340 is parallel to the center line connecting the first fixed region 311 and the second fixed region 321. The stress transmission path will be distributed along this relatively regular direction, so that the stress is more evenly distributed inside the plate structure 30. This avoids the phenomenon that the two parts of the connection 33 or the first sub-plate 31 and the second sub-plate 32 have excessive stress due to inconsistent force transmission directions, thereby causing stress fatigue.

[0185] In this embodiment of the application, the groove 34 may include a first groove portion 341 located on the first sub-piece 31 and / or a second groove portion 342 located on the second sub-piece 32.

[0186] It should be understood that the groove 34 may include a first groove portion 341, wherein the first groove portion 341 is located on the first sub-piece 31; the groove 34 may also include a second groove portion 342, wherein the second groove portion 342 is located on the second sub-piece 32; the groove 34 may also include a first groove portion 341 and a second groove portion 342, wherein the first groove portion 341 is located on the first sub-piece 31 and the second groove portion 342 is located on the second sub-piece 32.

[0187] In this embodiment, the groove 34 may include only the first groove portion 341, or only the second groove portion 342, or both the first groove portion 341 and the second groove portion 342. Alternatively, the groove 34 may include the intermediate groove portion 340 and the first groove portion 341, or the intermediate groove portion 340 and the second groove portion 342, or the intermediate groove portion 340, the first groove portion 341, and the second groove portion 342.

[0188] In this embodiment of the application, the shapes of the first groove portion 341 and the second groove portion 342 can be elongated, arc-shaped, or curved, etc. For example, the shapes of the first groove portion 341 and the second groove portion 342 can be arc-shaped with opposite centers, or wavy, etc.

[0189] In this embodiment, the first groove portion 341 and the second groove portion 342 can extend in various directions on the plate structure 30.

[0190] In this embodiment, the first groove 341 is located on the first sub-piece 31, which can disperse the stress on the first sub-piece 31 and avoid stress concentration on the first sub-piece 31; similarly, the second groove 342 is located on the second sub-piece 32, which can disperse the stress on the second sub-piece 32 and avoid stress concentration on the second sub-piece 32.

[0191] The first groove portion 341 and the second groove portion 342 can have various shapes, which will be discussed below. Figure 8 and Figure 9Let me introduce it.

[0192] Figure 8 This is another structural diagram of the plaque structure according to an embodiment of this application. Figure 8 As shown, the first groove portion 341 partially surrounds the first fixed region 311 and / or the second groove portion 342 partially surrounds the second fixed region 321.

[0193] It should be understood that the groove 34 may include a first groove portion 341, wherein the first groove portion 341 partially surrounds the first fixed region 311; the groove 34 may also include a second groove portion 342, wherein the second groove portion 342 partially surrounds the second fixed region 321; the groove 34 may also include a first groove portion 341 and a second groove portion 342, wherein the first groove portion 341 partially surrounds the first fixed region 311 and the second groove portion 342 partially surrounds the second fixed region 321.

[0194] In this embodiment of the application, the groove 34 may include a middle groove portion 340, or it may not include a middle groove portion 340.

[0195] In this embodiment, the first groove portion 341 and the second groove portion 342 can be arc-shaped, located near the first fixed region 311 and the second fixed region 321 respectively, and surrounding part of the edges of the first fixed region 311 and the second fixed region 321.

[0196] It should be understood that the first groove 341 and the second groove 342 can surround the area between the first fixed area 311 and the second fixed area 321, thereby increasing the stress transmission path to the area between the first fixed area 311 and the second fixed area 321.

[0197] Figure 9 This is another schematic diagram of the stress transfer path according to an embodiment of this application. Figure 9 As shown, the dashed lines represent the stress transmission path. When the plate structure 30 is subjected to vibration and impact, the stress is transmitted outwards from the first fixed region 311 and the second fixed region 321. When the first groove 341 and the second groove 342 are absent, the stress is transmitted to the connecting part 33 along a straight path. The first groove 341 and the second groove 342 allow the stress to be transmitted along the edges of the first groove 341 and the second groove 342 in a curved path, increasing the stress transmission path. This allows the stress that was originally concentrated in a few directions or areas to be distributed to more paths and areas, thereby effectively reducing the degree of stress concentration and reducing the risk of material fatigue, cracks, or even fracture caused by stress concentration.

[0198] Figure 10 This is another structural diagram of the plaque structure according to an embodiment of this application. For example... Figure 10As shown, the first groove portion 341 and / or the second groove portion 342 extend along a second direction, wherein the second direction is perpendicular to the line connecting the centers of the first fixed region 311 and the second fixed region 321.

[0199] It should be understood that the cross-sectional shape of the middle groove 340 along the Y direction can be elongated, including rectangular, trapezoidal, etc.

[0200] It should be understood that the edges of the central groove portion 340 may be rounded or beveled, and this application does not limit this.

[0201] In this embodiment, the extension directions of the first groove 341 and the second groove 342 are perpendicular to the line connecting the centers of the first fixed region 311 and the second fixed region 321. When stress encounters the first groove 341 and / or the second groove 342 extending along the Y direction, it will change its propagation direction according to the shape of the first groove 341 and / or the second groove 342 and begin to diffuse along the Y direction, breaking the original single stress transmission mode and allowing stress to propagate to more dimensions, thereby effectively increasing the stress transmission path.

[0202] Figure 11 This is another structural diagram of the plaque structure according to an embodiment of this application. Figure 11 As shown, the intermediate groove portion 340 connects the first groove portion 341 and / or the second groove portion 342.

[0203] It should be understood that the groove 34 includes a middle groove portion 340 and a first groove portion 341, wherein the middle groove portion 340 is connected to the first groove portion 341; the groove 34 may also include a middle groove portion 340 and a second groove portion 342, wherein the middle groove portion 340 is connected to the second groove portion 342; the groove 34 also includes a middle groove portion 340, a first groove portion 341 and a second groove portion 342, wherein the middle groove portion 340 is connected to the first groove portion 341 and the second groove portion 342.

[0204] In this embodiment, the intermediate groove 340 can reduce stress concentration in the middle of the plate structure 30, and the first groove 341 and the second groove 342 can increase the stress transmission path. When the intermediate groove 340 connects the first groove 341 and / or the second groove 342, the function of the groove 34 can be better utilized, so that the groove 34 can both increase the stress transmission path and avoid stress concentration.

[0205] In this embodiment, when the flap structure 30 is subjected to vibration and impact, the stress is transmitted outward from the first fixed region 311 and the second fixed region 321 as the center. The stress is transmitted along the edges of the first groove 341 and the second groove 342 to the middle groove 340. Since the middle groove 340 blocks the transmission of stress between the connecting parts 33, the stress will continue to be transmitted along an approximately circular path, so that the stress can be distributed on the flap structure 30.

[0206] Figure 12 This is another structural diagram of the plaque structure according to an embodiment of this application. Figure 12 As shown, the groove 34 is axially symmetrical along a first direction, wherein the first direction is parallel to the line connecting the centers of the first fixed region 311 and the second fixed region 321.

[0207] It should be understood that the groove 34 has axial symmetry, and its axis of symmetry is parallel to the X direction.

[0208] It should be understood that the groove 34 may include a central groove portion 340, the distances from the edges of the central groove portion 340 on both sides along the Y direction to the axis of symmetry are equal, that is, the distances from the edges of the central groove portion 340 on both sides along the Y direction to the center line of the central groove portion 340 along the X direction are equal.

[0209] It should be understood that the groove 34 may also include a first groove portion 341 and / or a second groove portion 342, wherein the distances from the edges of the first groove portion 341 and / or the second groove portion 342 on both sides along the Y direction to the axis of symmetry are equal, that is, the distances from the edges of the first groove portion 341 and / or the second groove portion 342 on both sides along the Y direction to the center line of the first groove portion 341 and / or the second groove portion 342 along the X direction are equal.

[0210] In this embodiment, when the plate structure 30 is subjected to stress due to vibration or impact, the axisymmetric groove 34 ensures that the stress dispersion process also exhibits symmetrical characteristics. The stress propagates evenly to both sides along the symmetrical structure of the groove 34, preventing stress concentration on one side or in a localized area. For example, under impact, the stress diffuses outwards from the axis of symmetry, extending and widening the stress dispersion path, thus more effectively utilizing the groove 34 to distribute stress and reducing stress concentration.

[0211] In the embodiments of this application, such as Figure 12 As shown, the groove 34 passes through the center of the first fixed region 311 and the second fixed region 321 along the center line of the first direction.

[0212] It should be understood that the shapes of the first fixed region 311 and the second fixed region 321 can be circles, triangles, polygons, etc.

[0213] In this embodiment, the center line of the groove 34 along the X direction coincides with the straight line along the X direction where the center of the first fixed region 311 and the second fixed region 321 are located.

[0214] In this embodiment, when the flap structure 30 is subjected to external vibration or impact, this positional relationship can evenly distribute the stress in the first fixed region 311 and the second fixed region 321. The stress is transmitted and diffused evenly to both sides with the center line of the groove 34 as the axis of symmetry. This avoids stress concentration on one side or in a local area. Through this symmetrical stress dispersion mechanism, the groove 34 can be used more effectively to distribute the stress, reducing the degree of stress concentration. This lowers the risk of cracks, deformation, or other damage to the flap structure 30 caused by stress concentration, extends the service life of the flap structure 30, and enables it to work reliably under long-term and complex working conditions.

[0215] In the embodiments of this application, such as Figure 12 As shown, the groove 34 may include a first groove portion 341 and a second groove portion 342. The groove 34 is axially symmetrical along a second direction, wherein the second direction is perpendicular to the line connecting the centers of the first fixed region 311 and the second fixed region 321.

[0216] In this embodiment of the application, the groove 34 may include a first groove portion 341 and a second groove portion 342, and the groove 34 may also include a first groove portion 341, a second groove portion 342 and an intermediate groove portion 340.

[0217] It should be understood that the groove 34 has axisymmetry, and its axis of symmetry is parallel to the Y direction.

[0218] It should be understood that the distances from the edges of the groove 34 along the X direction to the axis of symmetry are equal, that is, the distances from the edges of the groove 34 along the X direction to the axis of symmetry of the groove 34 along the Y direction are equal.

[0219] It should be understood that the vertical distances from the centers of the first fixed region 311 and the second fixed region 321 to the groove 34 along the Y-axis of symmetry are equal.

[0220] In this embodiment, when the plate structure 30 is subjected to stress by vibration or impact, the axisymmetric groove 34 can make the stress dispersion process symmetrical, so that the stress dispersed to the first sub-plate 31 and the second sub-plate 32 is the same, reducing the possibility of uneven stress distribution, which could lead to stress fatigue in the first sub-plate 31 or the second sub-plate 32.

[0221] In this embodiment, the axisymmetric structure also allows current to flow in or out of the first fixed region 311, pass through the plate structure 30 along a symmetrical and uniform path, and then flow out or in from the second fixed region 321, thus avoiding problems such as current path deviation.

[0222] Figure 13 This is another structural diagram of the plastron structure according to an embodiment of this application. Figure 14 for Figure 13 The front view of the plaque structure shown. Figure 13 and Figure 14 As shown, the bar structure 30 has a minimum flow dimension w, the thickness of the bar structure 30 is t, and the flow rate L of the bar structure 30 satisfies: L≥5wt.

[0223] In this embodiment, the minimum flow size w is the minimum width of the flow between the first fixed region 311 and the second fixed region 321. For example, when the groove 34 includes an intermediate groove portion 340, a first groove portion 341, and a second groove portion 342, the minimum flow size w is composed of the minimum distances w1 and w2 between the edges of the first groove portion 341 and the second groove portion 342 and the edge of the tab structure 30.

[0224] It should be understood that the thickness t of the plaster structure 30 is the dimension of the plaster structure 30 along the Z direction, and the thickness t is the main thickness of the plaster structure 30.

[0225] It should be understood that the plate structure 30 has a minimum flow area, which is the product of the minimum flow size w and the thickness t.

[0226] In this embodiment, the flow rate L of the bar structure 30 refers to the amount of current or fluid that can pass through the bar structure 30 within a certain time period.

[0227] It should be understood that the current-carrying area of ​​the flap structure 30 affects the current flow rate L. The resistance is inversely proportional to the current-carrying area of ​​the flap structure 30. When the flap structure 30 acts as a current conductor, a larger current-carrying area means a smaller resistance, thus allowing a larger current to pass through, i.e., increasing the current flow rate.

[0228] In this embodiment of the application, satisfying L≥5wt during current conduction allows the plate structure 30 to have sufficient conductivity to meet the current requirements under different operating conditions.

[0229] Figure 15 This is another structural diagram of the plaque structure according to an embodiment of this application. Figure 15 As shown, the size of the middle groove portion 340 along the second direction is greater than or equal to 2 mm and less than or equal to 10 mm, wherein the second direction is perpendicular to the line connecting the center of the first fixed region 311 and the second fixed region 321.

[0230] In this embodiment of the application, the dimension a of the intermediate groove portion 340 along the Y direction can be greater than or equal to 4 mm and less than or equal to 8 mm.

[0231] It should be understood that the dimension a of the middle groove portion 340 along the Y direction can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0232] In this embodiment, the dimension of the intermediate groove 340 along the Y direction is in the range of 2mm to 10mm, achieving a balance and coordination in various aspects such as stress transmission and distribution, current distribution, structural strength, and processing technology. This not only effectively alters the stress distribution using the groove 340, but also ensures that the mechanical and electrical properties of the battery pack structure 30 are not significantly affected. Furthermore, it considers the feasibility and economy of manufacturing, enabling the battery pack structure 30 to stably and reliably perform its functions of connecting battery cells and conducting current under complex working environments and application requirements.

[0233] In this embodiment of the application, the angle of the first groove portion 341 surrounding the first fixed region 311 is greater than or equal to 20° and less than or equal to 100°; and / or the angle of the second groove portion 342 surrounding the second fixed region 321 is greater than or equal to 20° and less than or equal to 100°.

[0234] In this embodiment of the application, the angle of the first groove portion 341 surrounding the first fixed region 311 can be greater than or equal to 40° and less than or equal to 70°; the angle of the second groove portion 342 surrounding the second fixed region 321 can be greater than or equal to 40° and less than or equal to 70°.

[0235] It should be understood that the angle of the first groove portion 341 around the first fixed area 311 can be 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, or 100°; and the angle of the second groove portion 342 around the second fixed area 321 can be 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, or 100°.

[0236] It should be understood that α in the figure is only for angular illustration. It can be represented as the angle of the first groove 341 around the first fixed area 311, or as the angle of the second groove 342 around the second fixed area 321.

[0237] In this embodiment, the surrounding angle is set between 20° and 100°, which can extend the stress transmission path while satisfying the structural strength of the plate structure 30, and achieve a balance and coordination of multiple functions such as stress transmission and dispersion and current distribution.

[0238] In this embodiment of the application, the groove 34 penetrates the tab structure 30 along a third direction, wherein the third direction is the thickness direction of the tab structure 30.

[0239] It should be understood that the shape of the groove 34 can remain consistent along the Z direction, that is, its cross-sectional shape remains basically unchanged when it extends from one side surface of the plate structure 30 to the other side surface.

[0240] In this embodiment, when the bar knot 30 is subjected to external vibration or impact and generates stress, the through groove 34 can provide a path for stress transmission in the thickness direction, dispersing the stress to more areas.

[0241] In this embodiment, when the flap structure 30 is subjected to external vibration or impact, the through groove 34 can also absorb part of the vibration or impact, reducing the risk of deformation and damage to the flap structure 30.

[0242] In this embodiment of the application, the flap structure 30 may be asymmetrical along a first direction and / or a second direction, wherein the first direction is parallel to the center line connecting the first fixed region 311 and the second fixed region 321, and the second direction is perpendicular to the center line connecting the first fixed region 311 and the second fixed region 321.

[0243] It should be understood that the platy structure 30 can be asymmetrical along the X direction, asymmetrical along the Y direction, or asymmetrical along both the X and Y directions.

[0244] In this embodiment, the asymmetry of the battery pack structure 30 makes it difficult to install backwards. That is, during installation, the correct installation direction can be identified, preventing the battery pack structure 30 from being installed in reverse. This reduces the possibility that the shape of the connection parts, such as the electrode terminals 23, of the corresponding battery cell 20 may not match, thus preventing current flow. The shape itself serves as a foolproof design element.

[0245] The flap structure 30 can be made asymmetrical by changing the chamfer, as shown below. Figure 16 and Figure 17 Describe them separately.

[0246] Figure 16 This is another structural diagram of the plaque structure according to an embodiment of this application. For example... Figure 16 As shown, the plate structure 30 may include a first chamfer 351 and a second chamfer 352, the size of the first chamfer 351 and the size of the second chamfer 352 are different.

[0247] In this embodiment of the application, the positions of the first chamfer 351 and the second chamfer 352 are not limited. For example, the first chamfer 351 can be located at the lower left corner of the plate structure 30, and the second chamfer 352 can be located at the upper left corner, upper right corner, or lower right corner of the plate structure 30.

[0248] It should be understood that, in addition to the first chamfer 351 and the second chamfer 352, the flap structure 30 may also include a third chamfer and a fourth chamfer, and the dimensions of the third and fourth chamfers are not limited. For example, the dimension of the third chamfer may be the same as or different from the dimension of the first chamfer 351; it may be the same as or different from the dimension of the second chamfer 352; the dimension of the fourth chamfer is similar.

[0249] Figure 17 This is another structural diagram of the plaque structure according to an embodiment of this application. Figure 17 As shown, the plate structure 30 may also include only the first chamfered angle 351, that is, the plate structure 30 has only one first chamfered angle 351, and the other three corners are rounded corners or right angles, etc.

[0250] In this embodiment of the application, the first chamfer 351 can be a 45° chamfer and its length is greater than or equal to 8 mm.

[0251] In this embodiment, the second chamfer 352 can also be a 45° chamfer with a length greater than or equal to 8 mm. However, the lengths of the first chamfer 351 and the second chamfer 352 are different.

[0252] In this embodiment of the application, the dimensions of the first chamfer 351 and the second chamfer 352 may also be non-45° chamfers.

[0253] In this embodiment, by setting chamfers, the correct installation direction of the battery cell structure 30 can be quickly determined by observing the obvious size difference between the two chamfers during installation. For example, during assembly, it is specified that the end with the larger first chamfer 351 should face a certain position of the battery cell 20. This can avoid the situation where the battery cell structure 30 cannot perform its connection, conductivity, and other functions properly due to misjudgment of the installation direction, thereby improving the accuracy and efficiency of assembly.

[0254] Figure 18 This is another structural diagram of the plaque structure according to an embodiment of this application. Figure 18 As shown, the bar structure 30 also includes a first positioning hole 312 located on the first sub-bar 31 and / or a second positioning hole 322 located on the second sub-bar 32.

[0255] It should be understood that the bar structure 30 may include a first positioning hole 312, wherein the first positioning hole 312 is located on the first sub-bar 31; the bar structure 30 may also include a second positioning hole 322, wherein the second positioning hole 322 is located on the second sub-bar 32; the bar structure 30 may also include a first positioning hole 312 and a second positioning hole 322, wherein the first positioning hole 312 is located on the first sub-bar 31 and the second positioning hole 322 is located on the second sub-bar 32.

[0256] It should be understood that the specific position of the first positioning hole 312 on the first sub-piece 31 is not limited in this application, nor is the specific position of the second positioning hole 322 on the second sub-piece 32.

[0257] In this embodiment, the first positioning hole 312 and the second positioning hole 322 play a positioning role during the assembly of the battery cell structure 30. When assembling the battery cell structure 30 with other components (such as the electrode terminals 23 of the battery cell 20), the first positioning hole 312 and the second positioning hole 322 can be used in conjunction with corresponding positioning pins, bolts, etc., to quickly and accurately determine the position of the battery cell structure 30 on the battery cell 20, avoiding positional deviations that may occur during manual installation, ensuring the consistency and accuracy of the installation position of the battery cell structure 30, and improving assembly efficiency.

[0258] In this embodiment, the first positioning hole 312 and the second positioning hole 322 can be riveting positioning holes, mainly used in the riveting process, and are the positions for installing rivets. The riveting positioning holes can determine the position of the flap structure 30. By inserting the rivets into the positioning holes, the flap structure 30 can be fixed in the predetermined position, ensuring the relative positional accuracy between the flap structure 30 and other components.

[0259] Figure 19 This is another structural diagram of the battery device according to an embodiment of this application. Figure 19 As shown, the battery device 100 may include multiple battery cells 20 and a tab structure 30. The tab structure 30 may include a first sub-tab 31, a second sub-tab 32, a connecting portion 33, and a groove 34. The first sub-tab 31 includes a first fixing region 311, the second sub-tab 32 includes a second fixing region 321, the connecting portion 33 is located between the first sub-tab 31 and the second sub-tab 32 and is electrically connected to both sub-tabs 31 and 32, and the groove 34 is located between the first fixing region 311 and the second fixing region 321. The tab structure 30 is connected to the electrode terminals of two adjacent battery cells 20.

[0260] It should be understood that multiple battery cells 20 can be arranged in a certain direction.

[0261] It should be understood that the plaque structure 30 may also include the plaque structure 30 in any embodiment.

[0262] In this embodiment, the first fixed region 311 and the second fixed region 321 of the plate structure 30 are connected to the electrode terminals 23 of two adjacent battery cells 20.

[0263] In this embodiment, the electrode terminal 23 includes a positive electrode terminal and a negative electrode terminal. The first fixed region 311 and the second fixed region 321 are respectively connected to the positive electrode terminal and the negative electrode terminal. That is, the first fixed region 311 is connected to the positive electrode terminal and the second fixed region 321 is connected to the negative electrode terminal, or the first fixed region 311 is connected to the negative electrode terminal and the second fixed region 321 is connected to the positive electrode terminal.

[0264] According to some embodiments of this application, this application also provides an energy storage device, which includes a battery device 100. The battery device 100 may include a plurality of battery cells 20 and a battery pack structure 30, wherein the plurality of battery cells 20 are arranged along a first direction; the battery pack structure 30 may include a first sub-battery 31, a second sub-battery 32, a connecting portion 33, and a groove 34. The first sub-battery 31 includes a first fixing region 311, the second sub-battery 32 includes a second fixing region 321, the connecting portion 33 is located between the first sub-battery 31 and the second sub-battery 32 and is electrically connected to the first sub-battery 31 and the second sub-battery 32, and the groove 34 is located between the first fixing region 311 and the second fixing region 321.

[0265] It should be understood that the plaque structure 30 may also include the plaque structure 30 in any embodiment.

[0266] In this embodiment, the battery device 100 is used to store or provide electrical energy.

[0267] According to some embodiments of this application, this application also provides an energy storage system, which includes a power conversion device and an energy storage device. The power conversion device is used to electrically connect a power generation device and an energy storage device. The energy storage device includes a battery device 100. The battery device 100 may include a plurality of battery cells 20 and a battery pack structure 30, wherein the plurality of battery cells 20 are arranged along a first direction; the battery pack structure 30 may include a first sub-batter 31, a second sub-batter 32, a connecting portion 33, and a groove 34. The first sub-batter 31 includes a first fixed region 311, the second sub-batter 32 includes a second fixed region 321, the connecting portion 33 is located between the first sub-batter 31 and the second sub-batter 32 and is electrically connected to the first sub-batter 31 and the second sub-batter 32, and the groove 34 is located between the first fixed region 311 and the second fixed region 321.

[0268] It should be understood that the plaque structure 30 may also include the plaque structure 30 in any embodiment.

[0269] According to some embodiments of this application, this application also provides a charging network, which includes charging piles and an energy storage device or energy storage system, wherein the energy storage device is used to provide electrical energy to the charging piles. The energy storage device includes a battery device 100. The battery device 100 may include a plurality of battery cells 20 and a battery strip structure 30, wherein the plurality of battery cells 20 are arranged along a first direction; the battery strip structure 30 may include a first sub-batter 31, a second sub-batter 32, a connecting portion 33, and a groove 34. The first sub-batter 31 includes a first fixing region 311, the second sub-batter 32 includes a second fixing region 321, the connecting portion 33 is located between the first sub-batter 31 and the second sub-batter 32 and is electrically connected to the first sub-batter 31 and the second sub-batter 32, and the groove 34 is located between the first fixing region 311 and the second fixing region 321.

[0270] It should be understood that the plaque structure 30 may also include the plaque structure 30 in any embodiment.

[0271] According to some embodiments of this application, see Figures 5 to 19 This application provides a flap structure 30, which may include a first sub-flap 31, a second sub-flap 32, a connecting portion 33, and a groove 34. The first sub-flap 31 includes a first fixing region 311, the second sub-flap 32 includes a second fixing region 321, the connecting portion 33 is located between the first sub-flap 31 and the second sub-flap 32 and is electrically connected to both sub-flap 31 and the second sub-flap 32, and the groove 34 is located between the first fixing region 311 and the second fixing region 321. The groove 34 includes a central groove portion 340 that spans the first sub-flap 31, the connecting portion 33, and the second sub-flap 32, and extends along the X direction. The groove 34 may further include a first groove portion 341 located on the first sub-flap 31 and a second groove portion 342 located on the second sub-flap 32, with the first groove portion 341 partially surrounding the first fixing region 311 and the second groove portion 342 partially surrounding the second fixing region 321. The intermediate groove 340 connects the first groove 341 and the second groove 342. The groove 34 is symmetrical about the Y direction along the X direction. The center line of the groove 34 along the X direction passes through the center of the first fixed region 311 and the second fixed region 321.

[0272] The flap structure 30 has a minimum flow dimension w, a thickness t, and a flow rate L satisfying L≥5wt. The intermediate groove 340 has a dimension along the Y direction greater than or equal to 2mm and less than or equal to 10mm. The first groove 341 surrounds the first fixed region 311 at an angle greater than or equal to 20° and less than or equal to 100°; the second groove 342 surrounds the second fixed region 321 at an angle greater than or equal to 20° and less than or equal to 100°. The groove 34 penetrates the flap structure 30 along the Z direction.

[0273] The flap structure 30 also includes a first chamfer 351 and a second chamfer 352, the dimensions of which are different. The flap structure 30 also includes a first positioning hole 312 located on the first sub-flap 31 and a second positioning hole 322 located on the second sub-flap 32.

[0274] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A plate structure for a secondary battery, characterized in that, include: The first sub-piece (31) includes a first fixed region (311); The second sub-plate (32) includes a second fixed region (321); A connecting part (33) is located between the first sub-piece (31) and the second sub-piece (32) and is electrically connected to the first sub-piece (31) and the second sub-piece (32); A groove (34) is located between the first fixed region (311) and the second fixed region (321).

2. The plaque structure according to claim 1, characterized in that, The groove (34) includes a central groove portion (340) that spans the first sub-piece (31), the connecting portion (33), and the second sub-piece (32).

3. The plaque structure according to claim 2, characterized in that, The intermediate groove (340) extends along a first direction; The first direction is parallel to the line connecting the centers of the first fixed region (311) and the second fixed region (321).

4. The plaque structure according to any one of claims 1 to 3, characterized in that, The groove (34) includes a first groove portion (341) located on the first sub-piece (31) and / or a second groove portion (342) located on the second sub-piece (32).

5. The plaque structure according to claim 4, characterized in that, The first groove portion (341) partially surrounds the first fixed region (311) and / or the second groove portion (342) partially surrounds the second fixed region (321).

6. The plaque structure according to claim 4, characterized in that, The first groove (341) and / or the second groove (342) extend along the second direction; The second direction is perpendicular to the line connecting the centers of the first fixed region (311) and the second fixed region (321).

7. The plaque structure according to any one of claims 4 to 6, characterized in that, The intermediate groove (340) connects the first groove (341) and / or the second groove (342).

8. The plaque structure according to any one of claims 1 to 7, characterized in that, The groove (34) is axially symmetrical along the first direction; The first direction is parallel to the line connecting the centers of the first fixed region (311) and the second fixed region (321).

9. The plaque structure according to claim 8, characterized in that, The groove (34) passes through the center of the first fixed region (311) and the second fixed region (321) along the center line of the first direction.

10. The plaque structure according to any one of claims 4 to 9, characterized in that, The groove (34) includes a first groove portion (341) and a second groove portion (342), and the groove (34) is axially symmetrical along a second direction; The second direction is perpendicular to the line connecting the centers of the first fixed region (311) and the second fixed region (321).

11. The plaque structure according to any one of claims 1 to 10, characterized in that, The flap structure has a minimum flow dimension w, the thickness of the flap structure is t, and the flow rate L of the flap structure satisfies: L≥5wt.

12. The plaque structure according to any one of claims 2 to 11, characterized in that, The dimension of the intermediate groove (340) along the second direction is greater than or equal to 2 mm and less than or equal to 10 mm; The second direction is perpendicular to the line connecting the centers of the first fixed region (311) and the second fixed region (321).

13. The plaque structure according to any one of claims 4 to 12, characterized in that, The angle of the first groove (341) around the first fixed region (311) is greater than or equal to 20° and less than or equal to 100°; and / or The angle of the second groove (342) around the second fixed area (321) is greater than or equal to 20° and less than or equal to 100°.

14. The plaque structure according to any one of claims 1 to 13, characterized in that, The groove (34) penetrates the plate structure in a third direction; Wherein, the third direction is the thickness direction of the plaster structure.

15. The plaque structure according to any one of claims 1 to 14, characterized in that, The plaque structure is asymmetrical along the first direction and / or the second direction; The first direction is parallel to the line connecting the centers of the first fixed region (311) and the second fixed region (321), and the second direction is perpendicular to the line connecting the centers of the first fixed region (311) and the second fixed region (321).

16. The plaque structure according to claim 15, characterized in that, The plaster structure includes a first chamfer (351) and a second chamfer (352), the size of the first chamfer (351) and the size of the second chamfer (352) are different.

17. The plaque structure according to any one of claims 1 to 16, characterized in that, The bar structure also includes a first positioning hole (312) located on the first sub-bar (31) and / or a second positioning hole (322) located on the second sub-bar (32).

18. A battery device, characterized in that, include: Multiple battery cells (20); According to any one of claims 1 to 17, the flap structure is connected to the electrode terminals (23) of two adjacent battery cells (20).

19. An energy storage device, characterized in that, include: A battery device, comprising the battery device according to claim 18, the battery device being used to store or provide electrical energy.

20. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device according to claim 19, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

21. A charging network, characterized in that, It includes a charging pile and an energy storage device according to claim 19 or an energy storage system according to claim 20, wherein the energy storage device is used to provide electrical energy to the charging pile.

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