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

Abstract

The utility model is suitable for the technical field of batteries, and provides a battery device, an energy storage device, an energy storage system and a charging network, the battery device comprises a box body and a battery monomer assembly; the battery monomer assembly comprises a limiting drawstring, a battery monomer and two end plates, and the limiting drawstring is at least used for restraining the deformation of the end plates in the first direction; the limiting drawstring comprises a first main body part and a second main body part, one end of the first main body part and one end of the second main body part are connected to the two end plates respectively, and the other end of the first main body part is movably connected to the other end of the second main body part, so that the size of the limiting drawstring in the first direction can be changed; according to the battery device provided by the embodiment of the invention, the length of the limiting drawstring is adjustable, so that the size difference between the limiting drawstring and the battery monomer assembly is reduced, and the size of the limiting drawstring can be matched with the size of the battery monomer assembly.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery device, an energy storage device, an energy storage system and a charging network. BACKGROUND

[0002] At present, from the development of market situation, the application of the battery device is more and more extensive. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of the battery device, the market demand is also increasing.

[0003] In the battery device, the two ends of the steel pull belt are usually connected to the end plates at the two ends of the battery monomer assembly to constrain the displacement of the end plates. However, due to the influence of the processing technology and the assembly technology, there is usually an error between the length of the steel pull belt and the length of the battery monomer assembly, which leads to the arching of the steel pull belt, thereby causing the workpiece of the steel pull belt to occupy too much space, and the steel pull belt is also easy to resist the box to cause the deformation of the box. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems, the application provides a battery device, an energy storage device, an energy storage system and a charging system, which can alleviate the arching problem of the steel pull belt.

[0005] In the first aspect, some embodiments of the application provide a battery device, comprising:

[0006] The box has a containing space; the battery monomer assembly is contained in the containing space, and the battery monomer assembly comprises a limiting pull belt, at least two battery monomers and two end plates, the two end plates are arranged at intervals along a first direction, the at least two battery monomers are arranged between the two end plates, and the limiting pull belt is used for at least constraining the deformation of the end plates in the first direction; the limiting pull belt comprises a first main body part and a second main body part, one end of the first main body part and one end of the second main body part are connected to the two end plates respectively, the other end of the first main body part is movably connected to the other end of the second main body part, so that the size of the limiting pull belt in the first direction can be changed.

[0007] In the technical scheme of the embodiment, the limiting pull belt comprises the first main body part and the second main body part which are movably connected to each other, so that the length of the limiting pull belt is adjustable, and the size difference between the limiting pull belt and the battery monomer assembly is reduced, so that the size of the limiting pull belt can be adapted to the size of the battery monomer assembly.

[0008] In some embodiments, the limiting pull belt further comprises a first fixing structure connected to the first body part and the second body part, and the first fixing structure is detachably connected to at least one of the first body part and the second body part, and the first fixing structure is used to provide resistance to the relative movement of the first body part and the second body part.

[0009] In the technical scheme of the embodiment, the first fixing structure is arranged to fix the first body part and the second body part and provide resistance to the relative movement of the first body part and the second body part. In the case of periodic expansion of the battery monomer during charging and discharging, the limiting pull belt can provide better constraint to the end plate under the action of the first fixing structure to inhibit the expansion deformation of the battery monomer.

[0010] In some embodiments, at least part of the first body part and the second body part overlap in a second direction perpendicular to the first direction, and the first fixing structure is connected to at least the overlapping part of the first body part and the second body part.

[0011] In the technical scheme of the embodiment, the first body part and the second body part can partially overlap, so that the length of the limiting pull belt can be adjusted by adjusting the length of the overlapping part of the first body part and the second body part, so that the length of the limiting pull belt can have a larger adjustment range, and thus the size of the limiting pull belt can better adapt to the size of the battery monomer assembly.

[0012] In some embodiments, the first body part is provided with a first hole, and the first hole is a waist hole with a length direction parallel to the first direction; one end of the first fixing structure is held on the side of the first body part away from the second body part, and the other end of the first fixing structure passes through the first hole and the second body part and is held on the side of the second body part away from the first body part.

[0013] The technical scheme of the embodiment provides some specific structures of the first body part. The first hole is arranged on the first body part to enable the first body part to move relative to the second body part, so as to adjust the length of the limiting pull belt. The first fixing structure can pass through the first hole to enable the first fixing structure to fix the first body part and the second body part in the case of different relative positions of the first body part and the second body part, so that the first fixing structure can adapt to different lengths of the limiting pull belt and provide resistance to the movement of the first body part and the second body part, thereby enabling the limiting pull belt to constrain the end plate.

[0014] In some embodiments, the second body part is provided with a second hole, and the second hole is a waist hole with a length direction parallel to the first direction; one end of the first fixing structure is held on the side of the first body part away from the second body part, and the other end of the first fixing structure passes through the first hole and the second hole and is held on the side of the second body part away from the first body part.

[0015] The technical scheme of the embodiment provides specific structures of the second main body part, the second hole is arranged on the second main body part, so that the second main body part can also move relative to the first main body part, so that the length of the limiting pull belt has a larger adjustment range; the first fixing structure can pass through the second hole, so that the first fixing structure can fix the first main body part and the second main body part in the case that the relative positions of the first main body part and the second main body part are different, so that the first fixing structure can adapt to different lengths of the limiting pull belt and can provide resistance for the movement of the first main body part and the second main body part, so that the limiting pull belt can constrain the end plate.

[0016] In some embodiments, the first fixing structure comprises a first pressing piece and a second pressing piece, the first pressing piece is pressed on a side of the first main body part away from the second main body part, the second pressing piece is pressed on a side of the second main body part away from the first main body part, and the second pressing piece is connected to the first pressing piece.

[0017] The technical scheme of the embodiment provides specific structures of the first fixing structure, the first pressing piece and the second pressing piece are arranged, and the first pressing piece is connected to the second pressing piece, so as to clamp and fix the first main body part and the second main body part through the first pressing piece and the second pressing piece.

[0018] In some embodiments, the first main body part comprises at least two first sub-main body parts, each first sub-main body part is connected in sequence along a first direction, one of the at least two first sub-main body parts adjacent to the end plate is connected to the corresponding end plate, one of the at least two first sub-main body parts adjacent to the second main body part is movably connected to the second main body part, and the adjacent two first sub-main body parts are movably connected to each other; the first main body part further comprises a second fixing structure, the second fixing structure is detachably connected to the adjacent two first sub-main body parts.

[0019] In the technical scheme of the embodiment, the first main body part can comprise at least two first sub-main body parts, so that the limiting pull belt can comprise at least three sections, so as to better adjust the overall length of the limiting pull belt; the second fixing structure is arranged, and the adjacent two second fixing structures are fixed through the second fixing structure, so that the limiting pull belt can constrain the end plate.

[0020] In some embodiments, the connection part of the first main body part and the second main body part is arranged adjacent to the end plate.

[0021] In the technical scheme of the embodiment, because the deformation amount of the part of the limiting pull belt far from the end plate is larger, the first main body part and the second main body part are arranged adjacent to the end plate; in the case that the limiting pull belt deforms, this arrangement can guide the limiting pull belt to deform near the end plate, so as to reduce the overall deformation amount of the limiting pull belt and the space occupation of the limiting pull belt.

[0022] In some embodiments, one end of the first main body part is bent and forms a first connecting part, and the first connecting part is connected to one side of the corresponding end plate away from the battery monomer; and / or, one end of the second main body part is bent and forms a second connecting part, and the second connecting part is connected to one side of the corresponding end plate away from the battery monomer.

[0023] In the technical scheme of the embodiment, the first connecting part and the second connecting part are arranged on the first main body part and the second main body part respectively, so that the first main body part and the second main body part can be more stably connected to the corresponding end plate, thereby improving the connection stability between the limiting pull belt and the end plate.

[0024] In some embodiments, the limiting pull belt is located on one side of the battery monomer along a second direction perpendicular to the first direction; one end of the first main body part away from the second main body part is connected to one end of the corresponding end plate along the second direction; and / or, one end of the second main body part away from the first main body part is connected to one end of the corresponding end plate along the second direction.

[0025] In the technical scheme of the embodiment, the connection parts of the first main body part and the second main body part and the corresponding end plate are in the same direction as the limiting pull belt, so as to facilitate the connection of the first main body part and the second main body part, and reduce the processing difficulty and assembly difficulty of the first main body part and the second main body part.

[0026] In some embodiments, the box body includes a first wall located on one side of the containing space along a second direction; the battery monomer assembly further includes an integrated busbar arranged on one side of the battery monomer assembly facing the first wall; and the limiting pull belt is arranged on one side of the integrated busbar facing the first wall.

[0027] In the technical scheme of the embodiment, the integrated busbar is arranged on one side of the limiting pull belt away from the first wall, so as to reduce the risk of damage to the integrated busbar caused by deformation of the limiting pull belt.

[0028] In a second aspect, the embodiments of the present application further provide a battery device, which is used for storing or providing electric energy.

[0029] In a third aspect, the embodiments of the present application further provide a battery system, which includes the battery device provided by some embodiments of the second aspect; and a power conversion device connected to the battery device, so as to perform power conversion on the input current of the battery device or the output current of the battery device.

[0030] In a fourth aspect, the embodiments of the present application further provide a charging network, which includes the battery device provided by some embodiments of the second aspect or the battery system provided by some embodiments of the third aspect; and a charging pile, and the battery device is used for providing electric energy for the charging pile.

[0031] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0032] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0033] Figure 1 This is an exploded view of the battery device provided in some embodiments of this application;

[0034] Figure 2 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0035] Figure 3 This is a side view schematic diagram of a battery device provided in some embodiments of this application;

[0036] Figure 4 for Figure 3 Schematic diagram of the cross section at point AA;

[0037] Figure 5 An exploded view of a battery cell assembly provided in some embodiments of this application;

[0038] Figure 6 for Figure 4 A magnified view of a portion of point B in the middle;

[0039] Figure 7 for Figure 5 A magnified view of a portion of point C in the middle;

[0040] Figure 8 This is a cross-sectional schematic diagram of the limiting strap provided in some embodiments of this application;

[0041] Figure 9 This application provides schematic diagrams of the structure of an energy storage system according to some embodiments.

[0042] Figure 10 This is a schematic diagram of the structure of a charging network provided in some embodiments of this application;

[0043] The markings in the diagram mean:

[0044] 1000. Energy storage devices;

[0045] 100. Battery device;

[0046] 10, box; 101, containing space; 11, first box; 111, first wall; 12, second box;

[0047] 20, battery cell assembly; 21, battery cell; 211, shell; 212, end cover; 213, electrode assembly; 214, electrode terminal; 22, end plate; 23, limiting pull belt; 231, first main body part; 2311, first hole; 2312, first connecting part; 232, second main body part; 2321, second hole; 2322, second connecting part; 233, first fixing structure; 2331, first pressing part; 2332, second pressing part; 24, integrated busbar;

[0048] 2000, power conversion device;

[0049] 3000, power generation device;

[0050] 4000, charging pile;

[0051] 5000, connector. DETAILED DESCRIPTION

[0052] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0054] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly and specifically limited.

[0055] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0056] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0057] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0058] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0059] In the description of the embodiments of the present application, unless otherwise specifically specified and limited, the technical terms "mounting", "connection", "connection", "fixing", and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0060] If not specifically stated, all embodiments and optional embodiments of the present application can be combined to form new technical solutions.

[0061] If not specifically stated, all technical features and optional technical features of the present application can be combined to form new technical solutions.

[0062] At present, from the development of market situation, the application of battery device is more and more extensive. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as military equipment, aerospace and other fields. With the continuous expansion of the application field of battery device, the demand of its market is also increasing.

[0063] The battery device is usually provided with a battery monomer assembly, one battery monomer assembly includes two end plates, and one or more battery monomers are clamped between the two end plates; in order to constrain the end plates and enable the end plates to better fix the battery monomers, a limiting pull belt is usually provided, the two ends of the limiting pull belt are connected to the two end plates respectively to play a role in constraining the end plates, and the limiting pull belt can be a steel belt or a structural member of other materials.

[0064] Since the two ends of the limiting pull belt are connected to the two end plates respectively, the length of the limiting pull belt should correspond to the sum of the thicknesses of the two end plates, the widths of the battery monomers, and the sum of other structures between the end plates, but due to the machining tolerances of each structure, the size of the limiting pull belt is difficult to completely match the corresponding structures.

[0065] In order to enable the two ends of the limiting pull belt to be connected to the two end plates, the length of the limiting pull belt is usually slightly longer than the sum of the sizes of the corresponding structures, which leads to the situation that the limiting pull belt is arched in the middle after the two ends of the limiting pull belt are connected to the two end plates; and since the length of the limiting pull belt is relatively long, a small difference between the limiting pull belt and the corresponding sizes of the structures can easily lead to a large arching height of the limiting pull belt. For example, in the case where the length of the limiting pull belt is 1mm longer than the sum of the sizes of the corresponding structures, the arching height of the limiting pull belt in the middle can reach more than 25mm.

[0066] According to the above situation, if a space is reserved in the box of the battery device for the arching of the limiting pull belt, this leads to a large space occupied by the limiting pull belt and negatively affects the energy density of the battery device; if no space is reserved for the arching of the limiting pull belt, the limiting pull belt is close to the first wall of the box, and the first wall of the box is usually a plastic member or other structural member with low strength and thin thickness, which leads to the situation that the arching of the limiting pull belt deforms and bulges the first wall of the box, which is not conducive to the installation of the battery device.

[0067] In order to alleviate the arching of the limiting pull belt and reduce the space problem caused thereby, the first wall can be replaced with a high-strength metal structural member with a relatively thick thickness; in such a battery device, neither a space for the arching of the limiting pull belt needs to be reserved in the box, nor does the deformation of the first wall occur in the case of the arching of the limiting pull belt, but this setting leads to a substantial increase in the overall weight of the battery device and a substantial increase in the cost of the battery device.

[0068] Based on the above considerations, in order to alleviate the problem of arching of the limiting pull belt, the battery device provided in the embodiments of the present application is configured to include a first main body part and a second main body part, and the first main body part and the second main body part are movably connected to each other; and a first fixing structure is further arranged to detachably connect the first main body part and the second main body part through the first fixing structure. In such a battery device, when the limiting pull belt is installed on the battery monomer assembly and the length of the limiting pull belt is greater than the length of the battery monomer assembly, the first fixing structure can be detached, and the first main body part and the second main body part are moved to adjust the length of the limiting pull belt, so that the length of the limiting pull belt can be adapted to the length of the battery monomer assembly, and then the first fixing structure is installed to fix the first main body part and the second main body part through the first fixing structure, so that the limiting pull belt can constrain the end plate.

[0069] In such a battery device, neither an arching space for the limiting pull belt needs to be reserved in the box, nor does the first wall need to be replaced.

[0070] The battery device disclosed in the embodiments of the present application can be used in a power consumption device using the battery device as a power source or a variety of energy storage systems using the battery as an energy storage element.

[0071] The following embodiments are described by taking, for example, a battery device 100 in an embodiment of the present application applied to an energy storage device 1000.

[0072] Reference Figure 1 , Figure 1 The exploded structural schematic diagram of the battery device 100 provided in some embodiments of the present application is shown.

[0073] The battery device 100 mentioned in the embodiments of the present application can include one or more battery monomer assemblies 20 for providing voltage and capacity. The battery monomer assembly 20 can include a plurality of battery monomers 21 connected in series, in parallel or in a mixed manner through a busbar component.

[0074] In some embodiments, the battery monomer assembly 20 is usually formed by arranging a plurality of battery monomers 21.

[0075] As an example, the battery monomer assembly 20 can be a battery module formed by arranging and fixing a plurality of battery monomers 21 into an independent module. As an example, the battery module can be formed by binding a plurality of battery monomers 21 with a cable tie.

[0076] In some embodiments, the battery device 100 can be a battery pack including a box 10 and one or more battery monomer assemblies 20, and the battery monomer assembly 20 is accommodated in the box 10.

[0077] As an example, the battery cell assembly 20 can be a battery module, and the battery cell assembly 20 can be housed in the case 10 by fixing the battery module in the case 10.

[0078] As an example, the battery cell assembly 20 can also be housed in the case 10 by fixing a plurality of battery cells 21 directly to the case 10.

[0079] As an example, the case 10 can include a first case 11 and a second case 12. The first case 11 and the second case 12 are fastened so that an enclosed space is formed inside the case 10 to house the battery cell assembly 20. The enclosed here means covered or closed, which can be sealed or unsealed. The first case 11 can be a top cover or a bottom plate.

[0080] As an example, the case 10 can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected to the frame so that an enclosed space is formed inside the case 10 to house the battery cell assembly 20.

[0081] In some embodiments, the case 10 can be part of a chassis structure of a vehicle. For example, part of the case 10 can be at least part of a floor of the vehicle, or part of the case 10 can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0082] Reference Figure 2 , Figure 2 A schematic diagram of a disassembled structure of a battery cell 21 is provided for some embodiments of the present application. The battery cell 21 refers to the smallest unit that constitutes a battery. As shown in the figure, the battery cell 21 includes a casing 211, an end cover 212, an electrode assembly 213, and other functional components.

[0083] The end cover 212 refers to a component that covers the opening of the shell 211 to isolate the internal environment of the battery cell 21 from the external environment. Without limitation, the shape of the end cover 212 can be adapted to the shape of the shell 211 to fit the shell 211. Optionally, the end cover 212 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 212 is less likely to deform when subjected to extrusion collision, allowing the battery cell 21 to have higher structural strength and improved safety performance. The end cover 212 can be provided with functional components such as the electrode terminal 214. The electrode terminal 214 can be used to electrically connect with the electrode assembly 213 for outputting or inputting the electrical energy of the battery cell 21. In some embodiments, the end cover 212 can also be provided with a pressure relief structure for relieving the internal pressure of the battery cell 21 when the internal pressure or temperature reaches a threshold value. The material of the end cover 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. In some embodiments, an insulating member can also be provided on the inner side of the end cover 212, which can be used to isolate the electrical connection components in the shell 211 from the end cover 212 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0084] The shell 211 is a component for fitting the end cover 212 to form the internal environment of the battery cell 21, wherein the formed internal environment can be used to accommodate the electrode assembly 213, the electrolyte and other components. The shell 211 and the end cover 212 can be independent components, and a maintenance opening can be provided on the shell 211, and the end cover 212 is covered on the maintenance opening to form the internal environment of the battery cell 21. Without limitation, the end cover 212 and the shell 211 can also be integrated, specifically, the end cover 212 and the shell 211 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 211, the end cover 212 is covered on the shell 211. The shell 211 can be various shapes and various sizes, such as cuboid, cylinder, hexagonal prism, etc. Specifically, the shape of the shell 211 can be determined according to the specific shape and size of the electrode assembly 213. The material of the shell 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon.

[0085] The electrode assembly 213 is a component in which an electrochemical reaction occurs in the battery cell 21. One or more electrode assemblies 213 can be included inside the case 211. The electrode assembly 213 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute a main body of the electrode assembly 213, and portions without active materials that each constitute a tab. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at opposite ends of the main body. During charging and discharging of the battery, active ions (e.g., lithium ions) reversibly intercalate and deintercalate between the positive electrode sheet and the negative electrode sheet to achieve charging and discharging, and the tabs connect the electrode terminals 214 to form a current loop.

[0086] In a first aspect, with reference to Figures 3 to 7 Some embodiments of the present application provide a battery device 100, including a box 10 and a battery cell assembly 20. The box 10 has a containing space 101; the battery cell assembly 20 is contained in the containing space 101, and the battery cell assembly 20 includes a limiting pull belt 23, battery cells 21, and two end plates 22, the two end plates 22 are arranged in a first direction, and at least two battery cells 21 are arranged between the two end plates 22, the limiting pull belt 23 is used for at least restricting the deformation of the end plate 22 in the first direction; the limiting pull belt 23 includes a first main body 231 and a second main body 232, one end of the first main body 231 and one end of the second main body 232 are connected to the two end plates 22 respectively, and the other end of the first main body 231 is movably connected to the other end of the second main body 232, so that the size of the limiting pull belt 23 in the first direction can be changed.

[0087] In the figure, the direction in which the X-axis is located is the length direction of the battery device 100, the direction in which the Y-axis is located is the width direction of the battery device 100, and the direction in which the Z-axis is located is the height direction of the battery device 100.

[0088] The box 10 refers to a structure in the battery device 100 for providing a containing space 101 for the battery cell 21 and other structures; the shape of the box 10 can be prismatic, cylindrical or other shapes; the material of the box 10 can include metal, plastic or other materials.

[0089] The containing space 101 refers to a space structure in the box 10 for containing the battery cell 21 and other structures, and the containing space 101 is formed in the box 10; the containing space 101 can be a prismatic space structure, a cylindrical space structure or other space structures, and the shape of the containing space 101 can also be set according to the shape of the box 10.

[0090] The battery cell assembly 20 refers to a structure composed of battery cells 21, and the number of battery cell assemblies 20 can be one, two or more.

[0091] The battery cell 21 refers to the smallest unit that constitutes the battery device 100, and one battery cell assembly 20 can include two battery cells 21 or three or more battery cells 21; in the case of one battery cell assembly 20 including two or more battery cells 21, each battery cell 21 in the battery cell assembly 20 can be connected in series, parallel or mixed connection; each battery cell 21 in the battery cell assembly 20 can be arranged in one direction or arrayed in two different directions; each battery cell 21 in the battery cell assembly 20 can be fixed and constrained by a binding belt, a plate body or other structures, and each battery cell 21 in the battery cell assembly 20 can also be directly arranged in the accommodation space 101 of the box body 10.

[0092] The end plate 22 refers to a structural member for constraining each battery cell 21 in the battery cell assembly 20, and the shape of the end plate 22 can be square, circular or other shapes; the material of the end plate 22 can include metal, plastic or other materials.

[0093] The number of end plates 22 is two, and the two end plates 22 are spaced apart along the first direction so that each battery cell 21 can be located between the two end plates 22; the two end plates 22 are clamped on both sides of each battery cell 21 along the first direction to fix each battery cell 21 in the first direction.

[0094] The first direction can be the length direction X of the battery device 100, or the width direction Y of the battery device 100 or other directions; for example, the first direction is the length direction X of the battery device 100.

[0095] The limiting pull belt 23 refers to a limiting structure for connecting the two end plates 22 in the battery cell assembly 20, and the two ends of the limiting pull belt 23 are connected to the two end plates 22 respectively to constrain the two end plates 22 and limit the displacement of the two end plates 22; since the two end plates 22 are arranged along the first direction, the two ends of the limiting pull belt 23 are connected to the two end plates 22 along the first direction to limit the displacement of the two end plates 22 in the first direction.

[0096] The limiting pull belt 23 can be a long strip structure, or a horizontally placed columnar structure or other shaped structure; the limiting pull belt 23 is connected to the end plate 22, and the limiting pull belt 23 can be connected to the end plate 22 by screwing, clamping or other means; the material of the limiting pull belt 23 can include metal, plastic or other materials.

[0097] The battery monomer 21 is prone to periodic expansion deformation in the process of charge and discharge cycle, which will cause the two end plates 22 to deform or displace away from the battery monomer 21. Therefore, the limiting pull belt 23 is arranged to provide a pulling force to the two end plates 22 in the direction of the battery monomer 21, thereby playing a role in restraining the end plate 22 and enabling the end plate 22 to better inhibit the expansion deformation of the battery monomer 21.

[0098] The limiting pull belt 23 can at least constrain the deformation of the end plate 22 in the first direction, so that the limiting pull belt 23 is only used to constrain the deformation of the end plate 22, and the limiting pull belt 23 can also constrain the deformation or displacement of the battery monomer 21 in the direction.

[0099] The first body part 231 refers to part of the structure of the limiting pull belt 23. The first body part 231 can be a strip-shaped structure, or a horizontally placed columnar structure, or other shaped structures. One end of the first body part 231 can be connected to one of the two end plates 22. The first body part 231 can be connected to the corresponding end plate 22 by screwing, clamping or other means.

[0100] The second body part 232 refers to part of the structure of the limiting pull belt 23. The second body part 232 can be a strip-shaped structure, or a horizontally placed columnar structure, or other shaped structures. One end of the second body part 232 can be connected to the other of the two end plates 22. The second body part 232 can be connected to the corresponding end plate 22 by screwing, clamping or other means.

[0101] The other end of the first body part 231 is movably connected to the other end of the second body part 232. The other end of the first body part 231 and the other end of the second body part 232 respectively refer to the end of the first body part 231 and the second body part 232 away from the corresponding end plate 22. The other end of the first body part 231 is movably connected to the other end of the second body part 232. A sliding groove can be provided on one of the first body part 231 and the second body part 232, and the other one is slidably connected in the sliding groove. The first body part 231 can also be movably inserted and penetrated through the second body part 232 to achieve the movable connection of the first body part 231 and the second body part 232. The first body part 231 and the second body part 232 can also be movably connected by other means. The movable connection of the first body part 231 and the second body part 232 can change the size of the limiting pull belt 23 in the first direction. In this way, the size of the limiting pull belt 23 in the first direction can adapt to the size of the battery monomer assembly 20 in the first direction. After the limiting pull belt 23 is installed on the two end plates 22, this arrangement can reduce the size difference between the limiting pull belt 23 and the battery monomer assembly 20 in the first direction, thereby reducing the risk of arching of the limiting pull belt 23.

[0102] In the case that the length of the limiting pull belt 23 is not equal to the size of the two end plates 22 and the battery monomers 21, the first body part 231 and the second body part 232 can be relatively movable and the overall length of the limiting pull belt 23 can be adjusted so that the length of the limiting pull belt 23 can be adapted to the size of the two end plates 22 and the battery monomers 21 and meet the requirements.

[0103] In the embodiment, the limiting pull belt 23 comprises the first body part 231 and the second body part 232 which are movably connected to each other, and the first body part 231 and the second body part 232 are fixed by the detachable first fixing structure 233, so that the length of the limiting pull belt 23 is adjustable, and the size difference between the limiting pull belt 23 and the battery monomer assembly 20 is reduced, and the size of the limiting pull belt 23 can be adapted to the size of the battery monomer assembly 20.

[0104] Reference Figures 3 to 8 In some embodiments, the limiting pull belt 23 further comprises a first fixing structure 233 connected to the first body part 231 and the second body part 232, and the first fixing structure 233 is detachably connected to at least one of the first body part 231 and the second body part 232, and the first fixing structure 233 is used to provide resistance to the relative movement of the first body part 231 and the second body part 232.

[0105] The first fixing structure 233 refers to a structure for fixing the first body part 231 and the second body part 232, and the first fixing structure 233 can comprise a bolt and nut structure, or a spring clamping structure or other clamping structure; the first fixing structure 233 can apply force to the first body part 231 and the second body part 232 to fix the first body part 231 and the second body part 232.

[0106] The first fixing structure 233 is detachably connected to at least one of the first body part 231 and the second body part 232, that is, the first fixing structure 233 can be detachably connected to only one of the first body part 231 or the second body part 232, and at this time, the first fixing structure 233 can be fixedly connected to the other one of the first body part 231 or the second body part 232, or can be integrally formed or connected by other means; the first fixing structure 233 can also be detachably connected to both the first body part 231 and the second body part 232.

[0107] According to the specific structure of the first fixing structure 233, the first fixing structure 233 can be detachably connected to the first body part 231 and the second body part 232 by screwing, inserting, pressure connecting or other means.

[0108] The first fixing structure 233 can fix the first body part 231 and the second body part 232 to fix the relative position of the first body part 231 and the second body part 232, and can also loosen the first body part 231 and the second body part 232 to adjust the relative position of the first body part 231 and the second body part 232, and further adjust the overall length of the limiting pull belt 23.

[0109] When the first fixing structure 233 is connected to the first body part 231 and the second body part 232, the first fixing structure 233 can completely fix the first body part 231 and the second body part 232, at this time, the first fixing structure 233 provides a larger resistance to the relative movement of the first body part 231 and the second body part 232, and the first body part 231 and the second body part 232 are difficult to move relatively; the first fixing structure 233 can also only provide a certain resistance to the relative movement of the first body part 231 and the second body part 232, at this time, the first body part 231 and the second body part 232 can move relatively, but need to overcome the resistance of the first fixing structure 233.

[0110] When the length of the limiting pull belt 23 is not equal to the size of the two end plates 22 and each battery monomer 21, the first fixing structure 233 can be removed first, or the first fixing structure 233 can not fix the first body part 231 and / or the second body part 232, so that the first body part 231 and the second body part 232 move and adjust the overall length of the limiting pull belt 23; after the first body part 231 and the second body part 232 move, the first fixing structure 233 is re-fixed to the first body part 231 and the second body part 232, so that the limiting pull belt 23 can adapt to the size change of the two end plates 22 and each battery monomer 21, and also provide constraint to the end plate 22.

[0111] When the first fixing structure 233 fixes the first body part 231 and the second body part 232, and the battery monomer 21 expands and exerts force on the end plate 22, the end plate 22 has a tendency to displace away from the battery monomer 21, that is, the first body part 231 and the second body part 232 also have a tendency to displace away from the battery monomer 21, at this time, the first fixing structure 233 can constrain the first body part 231 and the second body part 232, and provide resistance to the mutual movement of the first body part 231 and the second body part 232, to hinder the deformation or movement of the end plate 22, thereby playing a role in restraining the end plate 22.

[0112] In the embodiment, the first fixed structure 233 is arranged to fix the first body part 231 and the second body part 232 and provide resistance for the relative movement of the first body part 231 and the second body part 232. In the case of the periodic expansion of the battery monomer 21 during the charging and discharging, the limiting pull belt 23 can provide better constraint for the end plate 22 under the action of the first fixed structure 233 to inhibit the expansion deformation of the battery monomer 21.

[0113] Reference Figures 3 to 8 In some embodiments, at least part of the first body part 231 and the second body part 232 overlap in a second direction, and the second direction is perpendicular to the first direction; and the first fixed structure 233 is connected to at least the overlapping part of the first body part 231 and the second body part 232.

[0114] The first body part 231 and the second body part 232 at least partially overlap in the second direction, that is, the first body part 231 projects in the second direction at least partially on the second body part 232, and the second body part 232 projects in the second direction at least partially on the first body part 231.

[0115] The second direction can be the length direction X of the battery device 100, or the width direction Y or other direction of the battery device 100; the second direction is perpendicular to the first direction, and in the case of the first direction being the length direction X of the battery device 100, the second direction can be the width direction Y or the height direction Z of the battery device 100; for example, the second direction is the height direction Z of the battery device 100, and the first direction is the length direction X of the battery device 100.

[0116] The first body part 231 and the second body part 232 at least partially overlap in the second direction, that is, the first body part 231 projects in the second direction at least partially on the second body part 232, and the second body part 232 projects in the second direction at least partially on the first body part 231.

[0117] The first fixed structure 233 is connected to at least the overlapping part of the first body part 231 and the second body part 232, that is, the first fixed structure 233 can be connected to the first body part 231 and the second body part 232 only at the overlapping part, or the first fixed structure 233 can be connected to the first body part 231 and the second body part 232 only partially at the overlapping part, and the other parts of the first fixed structure 233 are connected to the mutually non-overlapping parts of the first body part 231 and the second body part 232, respectively.

[0118] The first fixed structure 233 is connected to the overlapping part of the first main body part 231 and the second main body part 232, so as to fix the relative position of the first main body part 231 and the second main body part 232 and limit the relative movement of the first main body part 231 and the second main body part 232; in the case of dismounting the first fixed structure 233, the first main body part 231 and the second main body part 232 can move relatively and change the size of the overlapping part of the first main body part 231 and the second main body part 232 in the first direction, so as to adjust the length of the whole limiting pull belt 23.

[0119] In examples, the first main body part 231 and the second main body part 232 can be moved away from each other in the first direction, at this time, the size of the overlapping part of the first main body part 231 and the second main body part 232 in the first direction decreases, and the size of the whole limiting pull belt 23 in the first direction increases; or the first main body part 231 and the second main body part 232 can be moved close to each other in the first direction, at this time, the size of the overlapping part of the first main body part 231 and the second main body part 232 in the first direction increases, and the size of the whole limiting pull belt 23 in the first direction decreases; in this way, the length of the limiting pull belt 23 is adjusted and can be adapted to the length of the battery monomer assembly 20.

[0120] In examples, in the case that the second direction is the height direction Z of the battery device 100, the first main body part 231 and the second main body part 232 overlap in the height direction Z of the battery device 100, that is, the first main body part 231 and the second main body part 232 overlap on the one end of the corresponding end plate 22 in the up-down direction; the first fixed structure 233 is connected to the part where the first main body part 231 and the second main body part 232 overlap with each other, so as to fix the first main body part 231 and the second main body part 232.

[0121] In the embodiment, the first main body part 231 and the second main body part 232 can partially overlap, so as to adjust the length of the limiting pull belt 23 by adjusting the length of the overlapping part of the first main body part 231 and the second main body part 232, so that the length of the limiting pull belt 23 can have a larger adjustment range, and thus the size of the limiting pull belt 23 can be better adapted to the size of the battery monomer assembly 20.

[0122] Reference Figures 3 to 8 In some embodiments, the first main body part 231 is provided with a first hole 2311, which is a waist hole with the length direction parallel to the first direction; one end of the first fixed structure 233 is pressed on the side of the first main body part 231 away from the second main body part 232, and the other end of the first fixed structure 233 passes through the first hole 2311 and the second main body part 232 and is pressed on the side of the second main body part 232 away from the first main body part 231.

[0123] The first hole 2311 refers to a hole structure formed on the first body part 231. The first hole 2311 can be a straight hole, a stepped hole, a tapered hole, or a hole structure of other shapes. The first hole 2311 is a waist hole with a length direction parallel to the first direction, that is, the first hole 2311 has a certain length in the first direction.

[0124] One end of the first fixing structure 233 is pressed on the side of the first body part 231 away from the second body part 232, and the other end of the first fixing structure 233 passes through the first hole 2311 and the second body part 232 and is pressed on the side of the second body part 232 away from the first body part 231. At this time, the two ends of the first fixing structure 233 can press the first body part 231 and the second body part 232 respectively, so as to achieve the effect of clamping and fixing the first body part 231 and the second body part 232, and can also provide resistance for the relative movement of the first body part 231 and the second body part 232. At the same time, part of the first fixing structure 233 passes through the first hole 2311. When the first fixing structure 233 is removed or loosened, the pressure of the first fixing structure 233 on the first body part 231 and the second body part 232 is small. At this time, the first body part 231 can have a certain movement space in the first direction through the first hole 2311, so that the first body part 231 can move relative to the second body part 232 and the overall length of the limiting drawstring 23 can be adjusted.

[0125] For example, the first fixing structure 233 can include a bolt and a nut. At this time, the head of the bolt can be abutted on the side of the first body part 231 away from the second body part 232, the shank of the bolt can pass through the first hole 2311 and the second body part 232 and extend to the side of the second body part 232 away from the first body part 231, and the nut can be threadedly connected to the part of the shank of the bolt located on the side of the second body part 232 away from the first body part 231 and pressed on the second body part 232. At this time, the head of the bolt and the nut can clamp the first body part 231 and the second body part 232 from both sides. When the first body part 231 and the second body part 232 are installed on the corresponding end plates 22 and the limiting drawstring 23 is arched, the nut can be loosened and the first body part 231 and the second body part 232 can move relative to each other, so that the overall length of the limiting drawstring 23 can be adapted to the length of the battery monomer assembly 20, so as to reduce the arching height of the limiting drawstring 23. After the overall length of the limiting drawstring 23 is adjusted, the nut can be tightened. At this time, the nut and the bolt head can clamp the first body part 231 and the second body part 232, provide resistance for the movement of the first body part 231 and the second body part 232, and thus the limiting drawstring 23 can better constrain the displacement or displacement trend of the two end plates 22.

[0126] It can be understood that the size of the first hole 2311 in the first direction can affect the size range of the relative movement of the first body part 231 and the second body part 232, that is, the size of the first hole 2311 in the first direction can affect the length adjustment range of the limiting drawstring 23; at the same time, the arrangement of the first hole 2311 will also cause the strength of the limiting drawstring 23 at the corresponding part to decrease, so in the case that the size of the first hole 2311 in the first direction meets the length adjustment requirement of the limiting drawstring 23, the size of the first hole 2311 in the first direction should be smaller.

[0127] The embodiment provides some specific structures of the first body part 231. The first hole 2311 is arranged on the first body part 231, so that the first body part 231 can move relative to the second body part 232 to adjust the length of the limiting drawstring 23; the first fixing structure 233 can pass through the first hole 2311, so that the first fixing structure 233 can fix the first body part 231 and the second body part 232 when the relative positions of the first body part 231 and the second body part 232 are different, so that the first fixing structure 233 can adapt to different lengths of the limiting drawstring 23 and can provide resistance for the movement of the first body part 231 and the second body part 232, so that the limiting drawstring 23 can constrain the end plate 22.

[0128] Reference Figures 3 to 8 In some embodiments, the second body part 232 is provided with a second hole 2321, and the second hole 2321 is a waist hole with a length direction parallel to the first direction; one end of the first fixing structure 233 is pressed and held on the side of the first body part 231 away from the second body part 232, and the other end of the first fixing structure 233 passes through the first hole 2311 and the second hole 2321 and is pressed and held on the side of the second body part 232 away from the first body part 231.

[0129] Similar to the first body part 231, the second hole 2321 refers to a hole structure arranged on the second body part 232, and the second hole 2321 can be a straight hole, a stepped hole, a tapered hole or other shaped hole structure; the second hole 2321 is a waist hole with a length direction parallel to the first direction, that is, the second hole 2321 has a certain length in the first direction.

[0130] One end of the first fixing structure 233 is pressed on the side of the first main body part 231 away from the second main body part 232, and the other end of the first fixing structure 233 passes through the second hole 2321 and the second hole 2321 and is pressed on the side of the second main body part 232 away from the first main body part 231, at this time, the two ends of the first fixing structure 233 can press the first main body part 231 and the second main body part 232 respectively, to play the effect of clamping and fixing the first main body part 231 and the second main body part 232, and can also provide resistance for the relative movement of the first main body part 231 and the second main body part 232; at the same time, part of the first fixing structure 233 passes through the first hole 2311 and the second hole 2321, in the case of dismounting or loosening the first fixing structure 233, the pressure of the first fixing structure 233 on the first main body part 231 and the second main body part 232 is small, at this time, the second main body part 232 can have a certain movement space in the first direction through the second hole 2321, so that the second main body part 232 can move relative to the first main body part 231, and the overall length of the limiting pull belt 23 can be adjusted.

[0131] In the case that the first hole 2311 and the second hole 2321 are respectively arranged on the first main body part 231 and the second main body part 232, the limiting pull belt 23 can have a larger length adjustment amount in the first direction, so as to adapt to different battery monomer assemblies 20 with larger size range difference.

[0132] For example, the first fixing structure 233 can include a bolt and a nut, at this time, the head of the bolt can be pressed on the side of the first main body part 231 away from the second main body part 232, the screw rod part of the bolt can pass through the first hole 2311 and the second hole 2321 and extend to the side of the second main body part 232 away from the first main body part 231, and the nut can be threadedly connected to the part of the screw rod part located on the side of the second main body part 232 away from the first main body part 231 and pressed on the second main body part 232, at this time, the head of the bolt and the nut can clamp the first main body part 231 and the second main body part 232 from both sides; in the case that the first main body part 231 and the second main body part 232 are installed on the corresponding end plate 22 and the limiting pull belt 23 is arched, the nut can be loosened and the first main body part 231 and the second main body part 232 can be moved relative to each other, so that the overall length of the limiting pull belt 23 can be adapted to the length of the battery monomer assembly 20, so as to reduce the arching height of the limiting pull belt 23; after the overall length of the limiting pull belt 23 is adjusted, the nut can be tightened, at this time, the nut and the bolt head can clamp the first main body part 231 and the second main body part 232, provide resistance for the movement of the first main body part 231 and the second main body part 232, and thus the limiting pull belt 23 can better constrain the displacement or displacement tendency of the two end plates 22.

[0133] It can be understood that the size of the second hole 2321 in the first direction can affect the size range of the relative movement of the first body part 231 and the second body part 232, that is, the size of the second hole 2321 in the first direction can affect the length adjustment range of the limiting pull belt 23; at the same time, the arrangement of the second hole 2321 also causes the strength of the limiting pull belt 23 at the corresponding part to decrease, so in the case that the size of the second hole 2321 in the first direction meets the length adjustment requirement of the limiting pull belt 23, the size of the second hole 2321 in the first direction should be smaller.

[0134] The embodiment provides some specific structures of the second body part 232. The second hole 2321 is arranged on the second body part 232, so that the second body part 232 can also move relative to the first body part 231, so that the length of the limiting pull belt 23 has a larger adjustment range; the first fixing structure 233 can pass through the second hole 2321, so that the first fixing structure 233 can fix the first body part 231 and the second body part 232 in the case that the relative positions of the first body part 231 and the second body part 232 are different, so that the first fixing structure 233 can adapt to different lengths of the limiting pull belt 23 and can provide resistance for the movement of the first body part 231 and the second body part 232, thereby enabling the limiting pull belt 23 to constrain the end plate 22.

[0135] Reference Figures 3 to 8 In some embodiments, the first fixing structure 233 includes a first pressing part 2331 and a second pressing part 2332. The first pressing part 2331 is pressed on a side of the first body part 231 away from the second body part 232, the second pressing part 2332 is pressed on a side of the second body part 232 away from the first body part 231, and the second pressing part 2332 is connected to the first pressing part 2331.

[0136] The first pressing part 2331 refers to a structure in the first fixing structure 233 for pressing the first body part 231. At least part of the first pressing part 2331 can be pressed on the first body part 231. According to the specific structure of the first fixing structure 233, the first pressing part 2331 can include a bolt, a part of a spring plate or other structures. The material of the first pressing part 2331 can include metal, plastic or other materials.

[0137] Similar to the first pressing part 2331, the second pressing part 2332 refers to a structure in the first fixing structure 233 for pressing the second body part 232. At least part of the second pressing part 2332 can be pressed on the second body part 232. According to the specific structure of the first fixing structure 233, the second pressing part 2332 can include a nut, another part of a spring plate or other structures. The material of the second pressing part 2332 can include metal, plastic or other materials.

[0138] The first pressing member 2331 and the second pressing member 2332 can clamp and fix the first main body part 231 and the second main body part 232, wherein the first pressing member 2331 can be pressed on the side of the first main body part 231 away from the second main body part 232, the second pressing member 2332 can be pressed on the side of the second main body part 232 away from the first main body part 231, at this time, the first pressing member 2331 and the second pressing member 2332 can cooperate with each other and clamp the first main body part 231 and the second main body part 232 between the first pressing member 2331 and the second pressing member 2332.

[0139] The second pressing member 2332 is connected to the first pressing member 2331, and the second pressing member 2332 can be directly connected to the first pressing member 2331, or indirectly connected to the first pressing member 2331 through an intermediate structure. The second pressing member 2332 can be detachably connected to the first pressing member 2331, or rotatably connected to the first pressing member 2331, or connected to the first pressing member 2331 in other ways, so that the second pressing member 2332 can cooperate with the first pressing member 2331 to clamp and fix the first main body part 231 and the second main body part 232, and the second pressing member 2332 and the first pressing member 2331 can also be detached to facilitate adjustment of the relative positions of the first main body part 231 and the second main body part 232.

[0140] The embodiment provides some specific structures of the first fixing structure 233, which are provided with the first pressing member 2331 and the second pressing member 2332, and the first pressing member 2331 is connected to the second pressing member 2332 to clamp and fix the first main body part 231 and the second main body part 232 through the first pressing member 2331 and the second pressing member 2332.

[0141] In some embodiments, the first main body part 231 includes at least two first sub-main body parts, each first sub-main body part is sequentially connected along a first direction, one of the at least two first sub-main body parts is connected to a corresponding end plate 22, one of the at least two first sub-main body parts adjacent to the second main body part 232 is movably connected to the second main body part 232, and adjacent two first sub-main body parts are movably connected to each other; the first main body part 231 further includes a second fixing structure, which is detachably connected to the adjacent two first sub-main body parts.

[0142] The first sub-main body part refers to a part of the first main body part 231, which can be a strip-shaped joint, or a horizontally arranged columnar structure, or a structure of other shapes; the number of the first sub-main body parts is at least two, that is, the number of the first sub-main body parts can be two, or three or more; each first sub-main body part is sequentially connected along a first direction, so that the arrangement direction of each first sub-main body part is consistent with the length direction of the first main body part 231.

[0143] One of the at least two first sub-body parts adjacent to the end plate 22 is connected to the end plate 22, and the first sub-body part can be connected to the corresponding end plate 22 by screwing, clamping or other means.

[0144] One of the at least two first sub-body parts adjacent to the second body part 232 is movably connected to the second body part 232, and the first sub-body part can move relative to the second body part 232 to adjust the relative position of the first sub-body part and the second body part 232, thereby adjusting the size of the limiting pull belt 23 in the first direction; in the case where one of the first sub-body parts is movably connected to the second body part 232, the first fixing structure 233 is used to connect the first sub-body part and the second body part 232.

[0145] The movable connection of the first sub-body part and the adjacent second body part 232 can be achieved by providing a sliding groove on one of the first sub-body part and the second body part 232 and movably connecting the other in the sliding groove, or by movably inserting one end of the first sub-body part into the second body part 232, so as to achieve the movable connection of the first body part 231 and the second body part 232. The first body part 231 and the second body part 232 can also be movably connected by other means.

[0146] The second fixing structure refers to a structure for fixing two adjacent first sub-body parts, and the second fixing structure can include a bolt and nut structure, a spring clamping structure or other clamping structures; the second fixing structure can apply force to the two adjacent first sub-body parts to fix the two adjacent first sub-body parts.

[0147] The second fixing structure is movably connected to the two adjacent first sub-body parts, and according to the specific structure of the second fixing structure, the second fixing structure can be movably connected to the two adjacent first sub-body parts by screwing, inserting, pressing or other means.

[0148] The second fixing structure can both fix the two adjacent first sub-body parts to fix the relative position of the two adjacent first sub-body parts, and also loosen the two adjacent first sub-body parts to adjust the relative position of the two adjacent first sub-body parts, thereby adjusting the overall length of the limiting pull belt 23.

[0149] In the case where the second fixing structure is connected to the two adjacent first sub-body parts, the second fixing structure can completely fix the two adjacent first sub-body parts, so that the two adjacent first sub-body parts are difficult to move relative to each other; or the second fixing structure can only provide resistance to the relative movement of the two adjacent first sub-body parts, so that the two adjacent first sub-body parts can move relative to each other, but need to overcome the resistance of the second fixing structure.

[0150] In an example, the first body part 231 includes two first sub-body parts, one end of one of the two first sub-body parts is connected to the end plate 22, and the other end is movably connected to the other first sub-body part adjacent thereto; one end of the other of the two first sub-body parts is movably connected to the first sub-body part adjacent thereto, and the other end is movably connected to the second body part 232 adjacent thereto; the first fixing structure 233 is detachably connected to the second body part 232 and the first sub-body part adjacent thereto, and the second fixing structure is detachably connected to the two first sub-body parts adjacent thereto.

[0151] The first body part 231 includes at least a first sub-body part, so that the limiting pull belt 23 can have a three-segment structure or more, so that the limiting pull belt 23 has a larger length adjustment range, so that the limiting pull belt 23 can adapt to larger size changes of the battery monomer assembly 20.

[0152] In the embodiment, the first body part 231 can include at least two first sub-body parts, so that the limiting pull belt 23 can include at least a three-segment structure, so as to better adjust the overall length of the limiting pull belt 23; the second fixing structure is provided, and the two second fixing structures adjacent thereto are fixed by the second fixing structure, so that the limiting pull belt 23 can constrain the end plate 22.

[0153] Reference Figures 3 to 5 、 Figure 7 In some embodiments, the connection part of the first body part 231 and the second body part 232 is adjacent to the end plate 22.

[0154] The connection part of the first body part 231 and the second body part 232 is adjacent to the end plate 22, that is, the connection part of the first body part 231 and the second body part 232 is located at any one of the two ends of the limiting pull belt 23 close to the end plate 22, but not in the middle of the limiting pull belt 23.

[0155] After the limiting pull belt 23 is installed on the battery monomer assembly 20, and the relative positions of the first body part 231 and the second body part 232 are adjusted, the battery monomer 21 will periodically expand and shrink during the charging and discharging cycle, at which time the limiting pull belt 23 still has the risk of deformation; in the case of shrinkage of the battery monomer 21, the limiting pull belt 23 is prone to slight arching, at which time the farther the part of the limiting pull belt 23 from the end plate 22, the greater the arching deformation of the part, and the maximum arching deformation is reached in the middle of the limiting pull belt 23; and in the case of the limiting pull belt 23 including the first body part 231 and the second body part 232, the limiting pull belt 23 is prone to arching at the connection part of the first body part 231 and the second body part 232.

[0156] Accordingly, the connecting position of the first body part 231 and the second body part 232 is arranged adjacent to the end plate 22, so that the connecting position of the first body part 231 and the second body part 232 deforms near the end plate 22, thereby reducing the deformation amount and absorbing the deformation of the limiting pull belt 23 through the connecting position of the first body part 231 and the second body part 232, thereby reducing the risk of arching of the middle part of the limiting pull belt 23.

[0157] In the embodiment, the farther the part of the limiting pull belt 23 from the end plate 22, the greater the deformation amount, so the first body part 231 and the second body part 232 are arranged adjacent to the end plate 22; in the case of deformation of the limiting pull belt 23, this arrangement can guide the limiting pull belt 23 to deform near the end plate 22, thereby reducing the deformation amount of the limiting pull belt 23 as a whole and reducing the space occupation of the limiting pull belt 23.

[0158] Reference Figures 3 to 8 In some embodiments, one end of the first body part 231 is bent and forms a first connecting part 2312, and the first connecting part 2312 is connected to the side of the corresponding end plate 22 away from the battery monomer 21; and / or, one end of the second body part 232 is bent and forms a second connecting part 2322, and the second connecting part 2322 is connected to the side of the corresponding end plate 22 away from the battery monomer 21.

[0159] The first connecting part 2312 refers to the structure of the first body part 231 for connecting with the end plate 22, and the first connecting part 2312 is bent to form the first body part 231, and the bent first connecting part 2312 can be connected to the side of the corresponding end plate 22 away from the battery monomer 21, that is, the first connecting part 2312 can be connected to the side of the end plate 22 along the first direction; the shape of the first connecting part 2312 can be square, or circular or other shapes.

[0160] Since the force borne by the first body part 231 is mainly the force along the first direction, the first body part 231 is connected to the end plate 22 through the first connecting part 2312, and the first connecting part 2312 is connected to the side of the end plate 22 along the first direction, at this time, the support force provided by the end plate 22 to the first connecting part 2312 is also along the first direction, so that the connecting position of the first connecting part 2312 and the end plate 22 can better fix the first connecting part 2312 and can better support the limiting pull belt 23.

[0161] Similar to the first connecting part 2312, the second connecting part 2322 refers to a structure of the second body part 232 for connecting with the end plate 22, and the second connecting part 2322 is bent from the second body part 232. The bent second connecting part 2322 can be connected to a side of the corresponding end plate 22 away from the battery monomer 21, that is, the second connecting part 2322 can be connected to a side of the end plate 22 along the first direction; the shape of the second connecting part 2322 can be square, circular or other shapes.

[0162] Since the force borne by the limiting pull belt 23 is mainly the force along the first direction, the second body part 232 is connected to the end plate 22 through the second connecting part 2322, and the second connecting part 2322 is connected to a side of the end plate 22 along the first direction. At this time, the support force provided by the end plate 22 to the second connecting part 2322 is also along the first direction, so that the connecting part of the second connecting part 2322 and the end plate 22 can better fix the second connecting part 2322 and better support the limiting pull belt 23.

[0163] The first body part 231 and the second body part 232 of the limiting pull belt 23 can be bent to form the first connecting part 2312 and the second connecting part 2322 respectively, or only one of them can be bent to form the first connecting part 2312 or the second connecting part 2322.

[0164] In this embodiment, the first connecting part 2312 and the second connecting part 2322 are arranged on the first body part 231 and the second body part 232 respectively, so that the first body part 231 and the second body part 232 can be more stably connected to the corresponding end plate 22, thereby improving the connection stability between the limiting pull belt 23 and the end plate 22.

[0165] In some embodiments, the limiting pull belt 23 is located on a side of the battery monomer 21 along the second direction, the second direction is perpendicular to the first direction; the end of the first body part 231 away from the second body part 232 is connected to an end of the corresponding end plate 22 along the second direction; and / or, the end of the second body part 232 away from the first body part 231 is connected to an end of the corresponding end plate 22 along the second direction.

[0166] The limiting pull belt 23 is located on a side of the battery monomer 21 along the second direction, that is, the limiting pull belt 23 is located on a side of the end plate 22 along the second direction. The second direction can be the length direction X of the battery device 100, or the width direction Y or other direction of the battery device 100; the second direction is perpendicular to the first direction, and in the case that the first direction is the length direction X of the battery device 100, the second direction can be the width direction Y or the height direction Z of the battery device 100; for example, the second direction is the height direction Z of the battery device 100, and the first direction is the length direction X of the battery device 100.

[0167] In the case that the limiting pull belt 23 is located on one side of the battery monomer 21 along the second direction, one end of the first main body part 231 away from the second main body part 232 is connected to one end of the corresponding end plate 22 along the second direction, that is, the first main body part 231 can be a straight line structure or an approximate straight line structure, and the connection part of the first main body part 231 and the corresponding end plate 22 can not need to be bent.

[0168] In the case that one end of the first main body part 231 away from the second main body part 232 is connected to one end of the corresponding end plate 22 along the second direction, the first main body part 231 can be directly connected to the corresponding end plate 22, which is convenient for assembly; at the same time, the first main body part 231 does not need to be bent or processed in other ways to adapt to the end plate 22, which is convenient for simplifying the processing procedure of the first main body part 231 and improving the processing efficiency of the first main body part 231.

[0169] Similarly to the first main body part 231, in the case that the limiting pull belt 23 is located on one side of the battery monomer 21 along the second direction, one end of the second main body part 232 away from the first main body part 231 is connected to one end of the corresponding end plate 22 along the second direction, that is, the second main body part 232 can be a straight line structure or an approximate straight line structure, and the connection part of the second main body part 232 and the corresponding end plate 22 can not need to be bent.

[0170] In the case that one end of the second main body part 232 away from the first main body part 231 is connected to one end of the corresponding end plate 22 along the second direction, the second main body part 232 can be directly connected to the corresponding end plate 22, which is convenient for assembly; at the same time, the second main body part 232 does not need to be bent or processed in other ways to adapt to the end plate 22, which is convenient for simplifying the processing procedure of the first main body part 231 and improving the processing efficiency of the second main body part 232.

[0171] In the case that the limiting pull belt 23 is located on one side of the battery monomer 21 along the second direction, the first main body part 231 and the second main body part 232 of the limiting pull belt 23 can be both connected to one end of the corresponding end plate 22 along the second direction, or only one of them can be connected to one end of the corresponding end plate 22 along the second direction.

[0172] In the embodiment, the connection part of the first main body part 231 and the second main body part 232 and the corresponding end plate 22 is the same as the direction in which the limiting pull belt 23 is located, so as to facilitate the connection of the first main body part 231 and the second main body part 232 and reduce the processing difficulty and assembly difficulty of the first main body part 231 and the second main body part 232.

[0173] Reference Figures 3 to 6In some embodiments, the box 10 comprises a first wall 111 located at one side of the containing space 101 along a second direction; the battery monomer assembly 20 further comprises an integrated busbar 24 located at a side of the battery monomer assembly 20 facing the first wall 111; and the limiting pull belt 23 is located at a side of the integrated busbar 24 facing the first wall 111.

[0174] The first wall 111 refers to a structural member located at one side of the box 10. The first wall 111 can be a plate structure or a beam structure. In the case where the box 10 comprises a top cover, a bottom plate and a frame, the first wall 111 can be the top cover or the bottom plate, or one side of the frame. The shape of the first wall 111 can be circular, square or other shapes, and the shape of the first wall 111 can also be set according to the shape of the box 10.

[0175] The first wall 111 is located at one side of the containing space 101 along the second direction, that is, the corresponding side of the first wall 111 in the second direction provides protection for the battery monomer assembly 20. The second direction can be the height direction Z of the battery device 100, or the length direction X or the width direction Y of the battery device 100.

[0176] For example, the first wall 111 is the top cover of the battery device 100, and the second direction is the height direction Z of the battery device 100.

[0177] The integrated busbar 24 refers to an electrical and signal management structure in the battery device 100. The integrated busbar 24 can include a signal acquisition structure such as a flexible printed circuit (FPC), a sampling wire harness and the like, and can also include an electrical connection structure such as a copper busbar, an aluminum busbar and the like.

[0178] At present, the limiting pull belt 23 is usually arranged at a side of the integrated busbar 24 facing the battery monomer 21. At this time, the integrated busbar 24 and the battery monomer 21 can jointly press and constrain the limiting pull belt 23, so as to reduce the deformation of the limiting pull belt 23 and reduce the space occupation of the limiting pull belt 23. However, in such a scheme, the limiting pull belt 23 will exert a large force on the integrated busbar 24, and easily cause damage to the integrated busbar 24. The integrated busbar 24 usually includes a flexible printed circuit, a sampling wire harness and the like, and the maintenance difficulty of the damaged integrated busbar 24 is high and the cost is high.

[0179] In view of this, the integrated busbar 24 is arranged between the limiting pull belt 23 and the battery monomer assembly 20, that is, the integrated busbar 24 is located on the side of the limiting pull belt 23 away from the first wall 111; under this arrangement, the deformation of the limiting pull belt 23 in the direction of the first wall 111 will be difficult to contact the integrated busbar 24 and will be difficult to cause negative effects on the integrated busbar 24; at this time, the integrated busbar 24 does not need to be used to constrain the limiting pull belt 23, so the strength of the integrated busbar 24 can be correspondingly reduced to reduce the cost.

[0180] In the case where the integrated busbar 24 is located on the side of the limiting pull belt 23 away from the first wall 111, the limiting pull belt 23 can be in contact with the integrated busbar 24, or can be arranged in a spaced manner from the integrated busbar 24, so as to further reduce the risk of damage to the integrated busbar 24 by the limiting pull belt 23.

[0181] It can be understood that the purpose of arranging the integrated busbar 24 on the side of the limiting pull belt 23 away from the first wall 111 is to reduce the risk of damage to the integrated busbar 24 by the deformation of the limiting pull belt 23, so the integrated busbar 24 can be directly opposite the limiting pull belt 23, or can be arranged in a staggered manner with part or the whole of the limiting pull belt 23.

[0182] For example, in the height direction Z of the battery device 100, the limiting pull belt 23 is located on the side of the integrated busbar 24 away from the first wall 111; in the width direction Y of the battery device 100, the limiting pull belt 23 is directly opposite the integrated busbar 24; for example, in the height direction Z of the battery device 100, the limiting pull belt 23 is located on the side of the integrated busbar 24 away from the first wall 111; in the width direction Y of the battery device 100, the limiting pull belt 23 is completely staggered with the integrated busbar 24 and does not overlap with the integrated busbar 24.

[0183] Since the limiting pull belt 23 is located on the side of the integrated busbar 24 away from the first wall 111, the limiting pull belt 23 lacks constraint, and its deformation is difficult to control; therefore, the limiting pull belt 23 comprises a first main body part 231, a second main body part 232, and a first fixing structure 233, so that the overall length of the limiting pull belt 23 is adjustable, so as to facilitate the length of the limiting pull belt 23 to be adapted to the length of the battery monomer assembly 20, and to reduce the deformation amount of the limiting pull belt 23.

[0184] In the embodiment, the integrated busbar 24 is arranged on the side of the limiting pull belt 23 away from the first wall 111, so as to reduce the risk of damage to the integrated busbar 24 by the deformation of the limiting pull belt 23.

[0185] In some embodiments, the battery device 100 comprises a box body 10 and a battery monomer assembly 20.

[0186] The box body 10 has a containing space 101, and the box body 10 comprises a first wall 111 located at one side of the containing space 101 in the height direction Z of the battery device 100, and the first wall 111 is a top cover of the box body 10.

[0187] The battery cell assembly 20 is contained in the containing space 101, and the battery cell assembly 20 comprises two end plates 22 arranged at intervals along the length direction X of the battery device 100, and a plurality of battery cells 21 are arranged between the two end plates 22, and the two end plates 22 clamp each battery cell 21 along the length direction X of the battery device 100.

[0188] The battery cell assembly 20 further comprises an integrated busbar 24 arranged at a side of each battery cell 21 facing the first wall 111.

[0189] The battery cell assembly 20 further comprises a limiting drawstring 23 arranged at a side of the integrated busbar 24 facing the first wall 111; the limiting drawstring 23 comprises a first main body part 231 and a second main body part 232 arranged in sequence along the length direction X of the battery device 100, one end of the first main body part 231 and the second main body part 232 is connected to the two end plates 22 respectively, the other end of the first main body part 231 and the second main body part 232 is connected to each other, the end of the first main body part 231 and the second main body part 232 connected to each other overlaps along the height direction Z of the battery device 100, and the end of the first main body part 231 and the second main body part 232 connected to each other can be relatively displaced along the length direction X of the battery device 100.

[0190] The first main body part 231 is provided with a first hole 2311, and the first hole 2311 is a waist hole with a length direction parallel to the length direction X of the battery device 100; the second main body part 232 is provided with a second hole 2321, and the second hole 2321 is a waist hole with a length direction parallel to the length direction X of the battery device 100; the first hole 2311 and the second hole 2321 at least partially overlap in the height direction Z of the battery device 100.

[0191] The battery cell assembly 20 further comprises a first fixing structure 233, and the first fixing structure 233 comprises a first pressing piece 2331 and a second pressing piece 2332, the first pressing piece 2331 is a bolt, the second pressing piece 2332 is a nut, the head of the bolt presses a side of the first main body part 231 away from the second main body part 232, and the threaded rod part of the bolt penetrates the first hole 2311 and the second hole 2321; the nut presses a side of the second main body part 232 away from the first main body part 231, and the nut is screwed on the threaded rod part of the bolt, so that the head of the bolt and the nut can clamp and fix the first main body part 231 and the second main body part 232.

[0192] The first body part 231 is bent downward at an end away from the second body part 232 and forms a first connecting part 2312, which is connected to a side of the corresponding end plate 22 away from the battery monomer 21 by a bolt; the second body part 232 is bent downward at an end away from the first body part 231 and forms a second connecting part 2322, which is connected to a side of the corresponding end plate 22 away from the battery monomer 21 by a bolt.

[0193] During installation of the limiting pull belt 23, the first body part 231 and the second body part 232 are first installed on the corresponding end plate 22 at one end; then, the nut is loosened to reduce the pressure of the head of the bolt and the nut on the first body part 231 and the second body part 232, and the relative positions of the ends of the first body part 231 and the second body part 232 are adjusted to adapt the length of the limiting pull belt 23 to the length of the battery monomer assembly 20; then, the nut is tightened to clamp and fix the first body part 231 and the second body part 232 by the head of the bolt and the nut.

[0194] In a second aspect, some embodiments of the present application further provide a storage device 1000, comprising the battery device 100 provided by some embodiments of the first aspect; wherein the battery device 100 is used to store or provide electric energy.

[0195] The storage device 1000 comprises one or more battery clusters to improve the voltage and capacity of the storage device 1000. When the storage device 1000 comprises multiple battery clusters, the multiple battery clusters are connected in parallel to improve the capacity of the storage device 1000.

[0196] The battery cluster can comprise multiple battery devices 100, and the multiple battery devices 100 are connected in series by the busbar part to improve the voltage of the storage device 1000. In the case that the battery cluster comprises multiple battery devices 100, the battery device 100 provided by the embodiments has a lower arching height of the limiting pull belt 23, a lower risk of deformation of the box body 10 of the battery device 100, and a smaller arrangement spacing of the battery device 100, thereby reducing the space requirement of the layout of the battery device 100 and reducing the space occupation.

[0197] The storage device 1000 can be used in a storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The storage device 1000 can store electric energy as needed and output electric energy at an appropriate time. For example, the storage device 1000 can store electric energy at a low electricity consumption valley, and provide electric energy for related users or electric equipment at a high electricity consumption peak. The storage system provided by the embodiments of the present application can be any power system that needs to use the storage device 1000.

[0198] In some embodiments, the energy storage device 1000 is an energy storage container or an energy storage cabinet.

[0199] In some embodiments, the energy storage device 1000 can include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0200] In some embodiments, the energy storage device 1000 can include a thermal management module, a master control module, a general control module, a power distribution module, a fire control module, and the like.

[0201] As an example, the thermal management module can include a liquid cooling unit, which provides cooling liquid to each battery device 100 through a pipeline for adjusting the temperature of the battery monomer 21.

[0202] As an example, the master control module can serve as a battery management unit of the battery cluster for monitoring and managing the battery cluster. The master control module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the charging and discharging current, voltage, and the like of the battery cluster can be controlled. The master control module includes a slave battery management unit (SBMU), a fusion switch, and the like.

[0203] As an example, the general control module can serve as a battery management unit of the energy storage device 1000 for monitoring and managing the energy storage device 1000. The general control module can monitor information such as current, voltage, power, state of charge, or temperature of the energy storage device 1000. For example, the charging and discharging current, voltage, and the like of the energy storage device 1000 can be controlled. As an example, the general control module includes an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) and fiber conversion module, and the like.

[0204] As an example, the fire control module includes a control panel, a detector, an alarm device, and the like for detecting, alarming, or extinguishing the energy storage system.

[0205] As an example, the power distribution module can be used to distribute power to the modules that need power in the energy storage device 1000.

[0206] In a third aspect, with reference to Figure 6 The embodiments of the present application also provide an energy storage system, which includes the energy storage device 1000 provided by some embodiments of the first aspect or the energy storage device 1000 provided by some embodiments of the second aspect.

[0207] The energy storage system further comprises a power conversion device 2000, which is used to electrically connect the power generation device 3000 and the energy storage device 1000. The power conversion device 2000 can be located inside the accommodation space of the energy storage device 1000 or arranged outside the accommodation space of the energy storage device 1000.

[0208] For example, the energy storage system can comprise one or more energy storage devices 1000 and a power conversion device 2000 (Power Converter System, PCS for short), which is used to connect between a power generation device and the energy storage device 1000. The power generation device is used to generate electric energy, and the electric energy generated by the power generation device can be stored into the energy storage device 1000 through the power conversion device 2000. For example, the power generation device can be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. The specific type of the power generation device is not limited in the present application.

[0209] In the fourth aspect, with reference to Figure 7 The present application further provides a charging network, which comprises the energy storage device 1000 provided by some embodiments of the first aspect, or the energy storage device 1000 provided by some embodiments of the second aspect, or the energy storage system provided by some embodiments of the third aspect. The charging network further comprises a charging pile 4000, and the energy storage device 1000 is used to provide electric energy for the charging pile 4000.

[0210] The charging pile 4000 is electrically connected with the energy storage device 1000, and the energy storage device 1000 is used to provide electric energy for the charging pile 4000. The charging pile 4000 is electrically connected with the battery device 100 in the energy storage device 1000 through a cable, and the battery device 100 can provide the electric energy stored by itself to the charging pile 4000. The charging pile 4000 has one or more connectors 5000, which are used to connect with an electric equipment (such as a vehicle), so as to charge the electric equipment.

[0211] The energy storage device 1000 can be located inside the charging pile 4000 (for example, a charging and storage integrated machine), or located outside the charging pile 4000.

[0212] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The application relates to a battery pack, comprising: a box body having a containing space; a battery cell assembly contained in the containing space, the battery cell assembly comprising a limiting pull belt, battery cells and two end plates, the two end plates being arranged in a first direction and spaced apart, at least two battery cells being arranged between the two end plates, and the limiting pull belt being used for limiting deformation of the end plates in the first direction; the limiting pull belt comprises a first main body part and a second main body part, one end of the first main body part and one end of the second main body part are connected to the two end plates respectively, and the other end of the first main body part is movably connected to the other end of the second main body part, so that the size of the limiting pull belt in the first direction can be changed.

2. The battery device according to claim 1, characterized by The limiting pull belt further comprises a first fixing structure connected to the first main body part and the second main body part, and the first fixing structure is detachably connected to at least one of the first main body part and the second main body part, and the first fixing structure is used for providing resistance to relative movement of the first main body part and the second main body part.

3. The battery device of claim 2, wherein, In a second direction, at least part of the first main body part and the second main body part overlap, and the second direction is perpendicular to the first direction; the first fixing structure is connected to at least the overlapping part of the first main body part and the second main body part.

4. The battery device of claim 3, wherein The first main body part is provided with a first hole, and the first hole is a waist hole with a length direction parallel to the first direction; one end of the first fixing structure is pressed on one side of the first main body part away from the second main body part, and the other end of the first fixing structure passes through the first hole and the second main body part and is pressed on one side of the second main body part away from the first main body part.

5. The battery device of claim 4, wherein, The second main body part is provided with a second hole, and the second hole is a waist hole with a length direction parallel to the first direction; one end of the first fixing structure is pressed on one side of the first main body part away from the second main body part, and the other end of the first fixing structure passes through the first hole and the second hole and is pressed on one side of the second main body part away from the first main body part.

6. The battery device according to any one of claims 3 to 5, wherein The first fixing structure comprises a first pressing piece and a second pressing piece, the first pressing piece is pressed on one side of the first main body part away from the second main body part, the second pressing piece is pressed on one side of the second main body part away from the first main body part, and the second pressing piece is connected to the first pressing piece.

7. The battery device according to any one of claims 1 to 5, wherein The first main body part comprises at least two first sub-main body parts, each first sub-main body part is connected in sequence along the first direction, one of the at least two first sub-main body parts adjacent to the end plate is connected to the corresponding end plate, one of the at least two first sub-main body parts adjacent to the second main body part is movably connected to the second main body part, and adjacent two first sub-main body parts are movably connected to each other, so that the size of the first sub-main body part in the first direction can be changed.

8. The battery device according to any one of claims 1 to 5, wherein The connecting part of the first main body part and the second main body part is arranged adjacent to the end plate.

9. The battery device according to any one of claims 1 to 5, wherein one end of the first main body part is bent and forms a first connecting part, the first connecting part is connected to a side of the corresponding end plate away from the battery monomer; and / or one end of the second main body part is bent and forms a second connecting part, the second connecting part is connected to a side of the corresponding end plate away from the battery monomer.

10. The battery device according to any one of claims 1 to 5, wherein The limiting pull belt is located on a side of the battery monomer along a second direction, the second direction being perpendicular to the first direction; one end of the first main body part away from the second main body part is connected to one end of the corresponding end plate along a second direction; and / or one end of the second main body part away from the first main body part is connected to one end of the corresponding end plate along a second direction.

11. The battery device of any one of claims 1-5, wherein, The box body comprises a first wall, the first wall being located on a side of the containing space along a second direction; The battery monomer assembly further comprises an integrated busbar, the integrated busbar being arranged on a side of the battery monomer assembly facing the first wall; The limiting pull belt is arranged on a side of the integrated busbar facing the first wall.

12. An energy storage device, characterized by, The battery device as claimed in any one of claims 1-11 is used for storing or providing electric energy.

13. An energy storage system characterized by, The energy storage device as claimed in claim 12; and A power conversion device connected with the energy storage device to perform power conversion on the current input into or output from the energy storage device.

14. A charging network characterized in that, The energy storage device as claimed in claim 12 or the energy storage system as claimed in claim 13; and A charging pile, the energy storage device being used for providing electric energy for the charging pile. The battery device as claimed in any one of claims 1-11 is used for storing or providing electric energy. The energy storage device as claimed in claim 12; and A power conversion device connected with the energy storage device to perform power conversion on the current input into or output from the energy storage device. The energy storage device as claimed in claim 12 or the energy storage system as claimed in claim 13; and A charging pile, the energy storage device being used for providing electric energy for the charging pile.

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