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

Abstract

The application is suitable for the technical field of batteries, and provides a battery device, an energy storage device, an energy storage system and a charging system. The battery device comprises a box body, the box body comprising a first wall; a battery monomer assembly is accommodated in an accommodation space, the battery monomer assembly comprising a limiting pull belt, at least two battery monomers and two end plates, the limiting pull belt comprising a main body part and a deformation part provided on the main body part, and the two ends of the main body part are connected to the two end plates respectively; the battery monomer assembly further comprises an integrated busbar, the integrated busbar being provided on a side of the battery monomer assembly facing the first wall, and the limiting pull belt is provided on a side of the integrated busbar facing the first wall. In the battery device provided by the application, the deformation part is arranged on the limiting pull belt, and the deformation part can be deformed to absorb the size difference between the limiting pull belt and the battery monomer assembly, so as to reduce the height of the arching deformation of the limiting pull belt in the first direction, reduce the space occupation of the limiting pull belt, and reduce the risk of the deformation of the box body.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device, energy storage device, energy storage system and charging system. Background Technology

[0002] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0003] In battery devices, the two ends of a steel strap are usually connected to the end plates at both ends of the battery cell assembly to constrain the displacement of the end plates. After the steel strap is installed, it is easy for the steel strap to arch, resulting in excessive space occupied by the steel strap. It is also easy for the steel strap to press against the housing, causing the housing to deform. Summary of the Invention

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

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

[0006] The housing has a receiving space and includes a first wall located on one side of the receiving space along a first direction. A battery cell assembly is housed within the receiving space. The battery cell assembly includes at least two battery cells and two end plates, the two end plates being spaced apart along a second direction, and at least two battery cells being disposed between the two end plates. The second direction is perpendicular to the first direction. The battery cell assembly also includes a limiting strap, which includes a main body and a deformable portion disposed on the main body. The two ends of the main body are respectively connected to the two end plates, and the deformable portion is capable of deformation. The battery cell assembly also includes an integrated busbar located on the side of the battery cell assembly facing the first wall. The limiting strap is located on the side of the integrated busbar facing the first wall.

[0007] In this embodiment, a deformation portion is provided on the limiting pull strap, and the deformation portion is deformable to absorb the size difference between the limiting pull strap and the battery cell assembly. When the length of the limiting pull strap is greater than the length of the battery cell assembly, the deformation portion can deform first and absorb the size difference, thereby reducing the risk of overall deformation of the limiting pull strap and reducing the height of the arching deformation of the limiting pull strap in the first direction, reducing the space occupied by the limiting pull strap and reducing the risk of housing deformation. The integrated busbar is set on the side of the limiting pull strap away from the first wall to reduce the risk of damage to the integrated busbar caused by the deformation of the limiting pull strap. Since the limiting pull strap is located on the side of the integrated busbar facing the first wall, the limiting pull strap lacks limiting, so a deformation portion is provided on the limiting pull strap to reduce the overall deformation of the limiting pull strap.

[0008] In some embodiments, at least a portion of the deformable portion deforms in a direction away from the battery cell and forms a bent portion.

[0009] The technical solution of this embodiment provides a specific structure for some deformable parts, such that the deformable parts include bending parts. During the deformation of the limiting pull belt, the deformable parts can deform before the bending parts, so that the bending parts can absorb the deformation of the limiting pull belt and guide the deformed part of the limiting pull belt, thereby reducing the arching height of the limiting pull belt in the first direction.

[0010] In some embodiments, there are at least two bends, and each bend is connected sequentially along a second direction to form a wave structure.

[0011] The technical solution of this embodiment further improves the specific structure of some deformation parts, so that there are at least two bending parts, and the bending parts are connected to form a wave structure. At this time, the deformation parts can not only absorb the deformation of the limiting pull belt, but also provide resistance when the limiting pull belt is subjected to tensile force, so that the limiting pull belt can better constrain the end plate.

[0012] In some embodiments, a portion of the deformable portion deforms along a third direction to form a bent portion, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0013] In the technical solution of this embodiment, the deformable part is deformed along the third direction to form a bent part, so that the deformable part can deform in the third direction and absorb the deformation of the limiting pull belt, and can further reduce the arching height of the limiting pull belt in the first direction.

[0014] In some embodiments, in a first direction, the size of the deformable portion is smaller than the size of the main body portion; and / or, in a third direction, the size of the deformable portion is smaller than the size of the main body portion, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0015] The technical solution of this embodiment provides some specific structures for the deformation part, such that the size of the deformation part in the first direction and / or the third direction is smaller than the size of the main body part, so that the deformation part becomes a part with lower strength on the limiting pull strip, thereby guiding and changing the deformation position of the limiting pull strip; when the length of the limiting pull strip is greater than the length of the battery cell assembly, the deformation part can deform first and absorb the size difference, thereby reducing the height of the arching deformation of the limiting pull strip in the first direction.

[0016] In some embodiments, the deformable part is an elastic structure, and the deformable part is provided with a first hole; and / or, the deformable part is recessed with a groove along a first direction; and / or, the deformable part is recessed with a groove along a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0017] In the technical solution of this embodiment, a first hole or a groove is provided on the deformable part, so that the strength of the deformable part is less than the strength of the main body, thereby guiding and changing the deformation position of the limiting pull belt; when the length of the limiting pull belt is greater than the length of the battery cell assembly, the deformable part can deform first and absorb the size difference, thereby reducing the height of the arching deformation of the limiting pull belt in the first direction.

[0018] In some embodiments, the first hole is a waist hole whose length direction is parallel to the second direction.

[0019] In the technical solution of this embodiment, the first hole is made so that the strength of the deformed part is less than that of the main body, so as to better guide and change the deformation position of the limiting pull belt.

[0020] In some embodiments, the deformable portion is disposed adjacent to the end plate.

[0021] In the technical solution of this embodiment, since the deformation of the limiting pull belt is greater the farther away from the end plate, the deformation part is set near the end plate to reduce the deformation of the deformation part, further reduce the space occupied by the limiting pull belt, and reduce the overall deformation of the limiting pull belt.

[0022] In some embodiments, at least one end of the main body is bent to form a connecting portion, which is connected to the side of the corresponding end plate away from the battery cell.

[0023] In the technical solution of this embodiment, a bent connecting part is provided at at least one end of the main body so that the main body can be more stably connected to the corresponding end plate, thereby improving the connection stability between the limiting pull strap and the end plate.

[0024] Secondly, embodiments of this application also provide an energy storage device, including a battery device provided in some embodiments of the first aspect, the battery device being used to store or provide electrical energy.

[0025] Thirdly, embodiments of this application also provide an energy storage system, including an energy storage device provided in some embodiments of the second aspect; and a power conversion device connected to the energy storage device to perform power conversion on the current input to the energy storage device or output from the energy storage device.

[0026] Fourthly, embodiments of this application also provide a charging network, including an energy storage device provided in some embodiments of the second aspect or an energy storage system provided in some embodiments of the third aspect; and a charging pile, wherein the energy storage device is used to provide electrical energy to the charging pile.

[0027] 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

[0028] 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:

[0029] Figure 1 This is an exploded view of the battery device provided in some embodiments of this application;

[0030] Figure 2 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0031] Figure 3 This is a side view schematic diagram of a battery device provided in some embodiments of this application;

[0032] Figure 4 for Figure 3 Schematic diagram of the cross section at point AA;

[0033] Figure 5 An exploded view of a battery cell assembly provided in some embodiments of this application;

[0034] Figure 6 for Figure 4 A magnified view of a portion of point B in the middle;

[0035] Figure 7 for Figure 5 A magnified view of a portion of point C in the middle;

[0036] Figure 8 for Figure 5 A magnified view of a portion of point D in the middle;

[0037] Figure 9 This is a top view schematic diagram of a limiting strap provided in some embodiments of this application;

[0038] Figure 10 Top view of the limiting strap provided in other embodiments of this application;

[0039] Figure 11 This application provides schematic diagrams of the structure of an energy storage system according to some embodiments.

[0040] Figure 12 This is a schematic diagram of the structure of a charging network provided in some embodiments of this application;

[0041] The markings in the diagram mean:

[0042] 100. Battery device;

[0043] 10. Box body; 101. Accommodation space; 11. First wall; 12. First box body; 13. Second box body;

[0044] 20. Battery cell assembly; 21. Battery cell; 211. Housing; 212. End cap; 213. Electrode assembly; 214. Electrode terminal; 22. End plate; 23. Limiting strap; 231. Main body; 2311. Connecting part; 232. Deformation part; 2321. Bending part; 2322. First hole; 2323. Groove; 24. Integrated busbar;

[0045] 1. Energy storage device; 2. Power conversion device; 3. Power generation device; 4. Charging pile; 5. Connector. Detailed Implementation

[0046] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0047] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0048] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0049] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0050] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0051] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0052] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0053] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0054] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0055] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0056] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0057] Battery devices typically consist of battery cell assemblies. A battery cell assembly includes two end plates, with one or more battery cells held between the two end plates. To constrain the end plates and better secure the battery cells, limit straps are usually provided. The two ends of the limit straps are connected to the two end plates respectively to constrain the end plates. The limit straps can be steel strips or structural components made of other materials.

[0058] Since the two ends of the limiting pull strap are connected to the two end plates respectively, the length of the limiting pull strap should correspond to the sum of the thickness of the two end plates, the width of each battery cell, and the sum of other structures between the end plates. However, due to the influence of the processing tolerances of each structure, the size of the limiting pull strap is difficult to match perfectly with the corresponding structures.

[0059] To allow the two ends of the retaining strap to connect to the two end plates, the length of the retaining strap is usually slightly longer than the sum of the dimensions of the corresponding structures. This results in the retaining strap arching in the middle after its ends are connected to the end plates. Furthermore, due to the relatively long length of the retaining strap, even slight differences in dimensions between the retaining strap and the corresponding structures can easily lead to a significant arching height. For example, if the length of the retaining strap exceeds the sum of the dimensions of the corresponding structures by 1mm, the arching height in the middle can reach over 25mm.

[0060] Based on the above, if space is reserved inside the battery pack for the arching of the retaining strap, the space occupied by the retaining strap will be too large, which will negatively affect the energy density of the battery pack. If no space is reserved for the arching of the retaining strap, the retaining strap will be close to the first wall of the pack, which is mostly made of plastic or other low-strength and thin structural components. This will cause the arching of the retaining strap to deform and bulge the first wall of the pack, which is not conducive to the installation of the battery pack.

[0061] To alleviate the arching of the limiting strap and reduce the resulting space problem, the first wall can be replaced with a thicker, high-strength metal structural component. In such a battery device, there is no need to reserve space for the arching of the limiting strap inside the box, nor will the first wall deform if the limiting strap arches. However, this setting will significantly increase the overall weight of the battery device and also significantly increase its cost.

[0062] Based on the above considerations, in order to alleviate the problem of arching of the limiting pull strap, this application provides a battery device with a deformation part on the limiting pull strap, and the deformation part has a deformation capability to absorb the deformation of the limiting pull strap. In such a battery device, when the length of the limiting pull strap is greater than the length of the battery cell assembly, the two ends of the limiting pull strap are connected to the two end plates, which causes the limiting pull strap to shrink and deform inward along its length direction. At this time, the deformation part can deform first and absorb the size difference, thereby reducing the arching height of the limiting pull strap, or making it difficult for the limiting pull strap to arch, thereby reducing the risk of overall deformation of the limiting pull strap, reducing the height of the arching deformation of the limiting pull strap, reducing the space occupied by the limiting pull strap, and reducing the risk of deformation of the housing.

[0063] In such a battery device, there is no need to reserve arched space for the limiting strap inside the box, nor is it necessary to replace the first wall.

[0064] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery as an energy storage element.

[0065] For ease of explanation, the following embodiments will be described using an example of a battery device 100 applied to an energy storage device 1 according to an embodiment of this application.

[0066] refer to Figure 1 , Figure 1 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application.

[0067] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 20 for providing voltage and capacity. The battery cell assembly 20 may include a plurality of battery cells 21, which are connected in series, parallel, or mixed connection via a busbar.

[0068] In some embodiments, the battery cell assembly 20 is typically formed by arranging a plurality of battery cells 21.

[0069] As an example, the battery cell assembly 20 can be a battery module, which is formed by arranging and fixing multiple battery cells 21 into an independent module. As an example, the battery module can be formed by bundling multiple battery cells 21 together with cable ties.

[0070] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more battery cell assemblies 20, the battery cell assemblies 20 being housed in the housing 10.

[0071] As an example, the battery cell assembly 20 can be a battery module, which can be housed in the housing 10 by fixing the battery module in the housing 10.

[0072] As an example, the battery cell assembly 20 can also be housed in the housing 10 by directly fixing multiple battery cells 21 to the housing 10.

[0073] As an example, the housing 10 may include a first housing 12 and a second housing 13. The first housing 12 and the second housing 13 are fastened together to form a closed space inside the housing 10 to house the battery cell assembly 20. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 12 may be a top cover or a bottom plate.

[0074] As an example, the housing 10 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 10 forms an enclosed space to house the battery cell assembly 20.

[0075] In some embodiments, the housing 10 may be part of the vehicle's chassis structure. For example, a portion of the housing 10 may be at least a portion of the vehicle's floor, or a portion of the housing 10 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0076] refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery cell 21 provided in some embodiments of this application. A battery cell 21 refers to the smallest unit that makes up a battery. As shown, the battery cell 21 includes a housing 211, an end cap 212, an electrode assembly 213, and other functional components.

[0077] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 21 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is not easily deformed under pressure and impact, allowing battery cell 21 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 214 can be provided on end cap 212. Electrode terminals 214 can be used for electrical connection with electrode assembly 213 to output or input electrical energy to battery cell 21. In some embodiments, end cap 212 can also be provided with a pressure relief structure for releasing internal pressure when the internal pressure or temperature of battery cell 21 reaches a threshold. The material of end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 212. The insulating element can be used to isolate the electrical connection components within the housing 211 from the end cap 212 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0078] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 21. This internal environment can accommodate the electrode assembly 213, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. A maintenance port can be provided on the housing 211, and the end cap 212 can be used to close the maintenance port to form the internal environment of the battery cell 21. Alternatively, the end cap 212 and the housing 211 can be integrated. Specifically, the end cap 212 and the housing 211 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 211, the end cap 212 closes the housing 211. The housing 211 can have various shapes and sizes, such as cuboid, cylindrical, or hexagonal prism. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 213. The shell 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0079] Electrode assembly 213 is the component in the battery cell 21 where electrochemical reactions occur. The casing 211 may contain one or more electrode assemblies 213. The electrode assembly 213 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 213, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 214 to form a current loop.

[0080] Firstly, reference Figures 3 to 7 This application provides a battery device 100, including a housing 10 and a battery cell assembly 20. The housing 10 has a receiving space 101, and the housing 10 includes a first wall 11 located on one side of the receiving space 101 along a first direction. A battery cell assembly 20 is received in the receiving space 101. The battery cell assembly 20 includes at least two battery cells 21 and two end plates 22. The two end plates 22 are spaced apart along a second direction, and at least two battery cells 21 are located between the two end plates 22. The second direction is perpendicular to the first direction. The battery cell assembly 20 also includes a limiting pull strap 23, which includes a main body 231 arranged along the second direction and a deformable part 232 provided on the main body 231. The two ends of the main body 231 are respectively connected to the two end plates 22, and the deformable part 232 can deform. The battery cell assembly 20 also includes an integrated busbar 24, which is located on the side of the battery cell assembly 20 facing the first wall 11. The limiting pull strap 23 is located on the side of the integrated busbar 24 facing the first wall 11.

[0081] In the figure, the X-axis is the length direction of the battery device 100, the Y-axis is the width direction of the battery device 100, and the Z-axis is the height direction of the battery device 100.

[0082] The housing 10 refers to the structure in the battery device 100 that provides a space 101 for housing the battery cell 21 and other structures; the shape of the housing 10 can be prismatic, cylindrical or other shapes; the material of the housing 10 can be metal, plastic or other materials.

[0083] The accommodating space 101 refers to the space structure in the housing 10 used to accommodate the battery cell 21 and other structures. The accommodating space 101 is formed inside the housing 10. The accommodating space 101 can be a prism-shaped space structure, a cylindrical space structure, or other shapes of space structures. The shape of the accommodating space 101 can also be set according to the shape of the housing 10.

[0084] The first wall 11 refers to a structural component located on one side of the box 10. The first wall 11 can be a plate structure or a beam structure. When the box 10 includes a top cover, a bottom plate and a frame, the first wall 11 can be the top cover or the bottom plate, or it can be one side of the frame. The shape of the first wall 11 can be circular, square or other shapes. The shape of the first wall 11 can also be set according to the shape of the box 10.

[0085] The first wall 11 is located on one side of the receiving space 101 along the first direction, that is, the first wall 11 provides protection for the battery cell assembly 20 on the corresponding side of the first direction; the first 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.

[0086] For example, the first wall 11 is the top cover of the battery device 100, and the first direction is the height direction Z of the battery device 100.

[0087] Battery cell assembly 20 refers to a structure composed of battery cells 21. The number of battery cell assemblies 20 can be one, two or more.

[0088] A battery cell 21 refers to the smallest unit that makes up the battery device 100. A battery cell assembly 20 may include two battery cells 21, or three or more battery cells 21. When a battery cell assembly 20 includes two or more battery cells 21, the battery cells 21 in the battery cell assembly 20 may be connected in series, in parallel, or in a mixed configuration. The battery cells 21 in the battery cell assembly 20 may be arranged in one direction or in an array along two different directions. The battery cells 21 in the battery cell assembly 20 may be fixed and constrained by straps, plates, or other structures. The battery cells 21 in the battery cell assembly 20 may also be directly placed in the receiving space 101 of the housing 10.

[0089] End plate 22 refers to the structural component in the battery cell assembly 20 used to constrain each battery cell 21. The shape of end plate 22 can be square, round or other shapes; the material of end plate 22 can include metal, plastic or other materials.

[0090] There are two end plates 22, and the two end plates 22 are spaced apart along the second 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 second direction to fix each battery cell 21 in the second direction.

[0091] The second 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 second direction is the length direction X of the battery device 100.

[0092] The limiting strap 23 refers to the limiting structure in the battery cell assembly 20 used to connect the two end plates 22. The two ends of the limiting strap 23 are respectively connected to the two end plates 22 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 second direction, the two ends of the limiting strap 23 along the second direction are respectively connected to the two end plates 22 to limit the displacement of the two end plates 22 in the second direction.

[0093] The limiting pull strap 23 can be a long strip structure, a horizontal column structure, or other shapes; the limiting pull strap 23 is connected to the end plate 22, and the limiting pull strap 23 can be connected to the end plate 22 by screwing, snapping, or other means; the material of the limiting pull strap 23 can include metal, plastic, or other materials.

[0094] The main body 231 refers to the part of the limiting pull strap 23 that is connected to the end plate 22. The main body 231 can be a strip structure, a horizontal column structure, or a structure of other shapes. The main body 231 is connected to the end plate 22 by screwing, snapping, or other means.

[0095] The deformable part 232 refers to the structure in the limiting pull belt 23 that can be deformed under force. The deformable part 232 may include a structure with elastic deformation capability, such as a spiral structure or a wave structure. The deformable part 232 may also include a structure with a lower strength than the main body part 231. The material of the deformable part 232 may include metal, plastic or other materials. The material of the deformable part 232 may be the same as or different from the material of the main body part 231.

[0096] The deformable part 232 can be a part of the main body 231 formed by deformation; the deformable part 232 can also be an independent structure connected to the main body 231. In this case, the main body 231 can include two spaced-apart parts, the deformable part 232 is located between the two parts and the two ends of the deformable part 232 are respectively connected to the two parts of the main body 231; the deformable part 232 can absorb the displacement of the main body 231 in the second direction and deform.

[0097] Understandably, the limiting pull belt 23 may include only one deformable part 232, or it may include two or more deformable parts 232.

[0098] After the two ends of the limiting pull strap 23 are installed on the two end plates 22, the deformable part 232 can deform to absorb the dimensional difference between the limiting pull strap 23 and the two end plates 22 in the second direction.

[0099] Because there may be processing errors during the manufacturing of end plates 22, errors may also exist during the manufacturing of battery cells 21, and errors may also exist during the assembly of the two end plates 22 and each battery cell 21, the accumulation of these errors after the two end plates 22 and each battery cell 21 are assembled may result in a large error range in their dimensions in the second direction. In order to accommodate this error range, the limiting pull strap 23 is usually made to be greater than or equal to the upper limit of this error range. This causes the length of the limiting pull strap 23 in the second direction to easily exceed the sum of the dimensions of the two end plates 22 and each battery cell 21 in the second direction. Furthermore, since the strength of the limiting pull strap 23 is relatively weaker the farther it is from the end plates 22, and the dimension of the limiting pull strap 23 in the second direction is relatively large, even a small difference between the length of the limiting pull strap 23 and the dimensions of the two end plates 22 and each battery cell 21 can cause the limiting pull strap 23 to arch and form an arc-shaped structure, resulting in a relatively high arch height in the middle of the limiting pull strap 23.

[0100] Accordingly, in this embodiment of the application, a deformation part 232 is provided on the limiting pull strap 23. During the assembly process of the limiting pull strap 23, the deformation part 232 can deform to absorb the difference between the length of the limiting pull strap 23 and the size of the two end plates 22 and each battery cell 21, and concentrate the deformation at the deformation part 232. The deformation part 232 can be used to guide the position of the deformation part 232 of the limiting pull strap 23, and can also be used to guide the deformation direction of the limiting pull strap 23, thereby reducing the arch height of the limiting pull strap 23, reducing the space occupied by the limiting pull strap 23, or reducing the risk of deformation of the housing 10 caused by the arching of the limiting pull strap 23.

[0101] When the battery cell 21 is charged and discharged and expands, the end plate 22 may move. At this time, the limiting strap 23 can still provide a certain constraint on the end plate 22, thereby suppressing the expansion of the battery cell 21.

[0102] For example, the deformation part 232 can be provided near the end plate 22 so that the deformation part 232 is close to the end plate 22, thereby reducing the deformation of the deformation part 232.

[0103] For example, the deformable part 232 can deform along the second or third direction to reduce the deformation of the deformable part 232 in the first direction, thereby reducing the arch height of the deformable part 232, reducing the space occupied by the limiting strap 23 in the first direction, and reducing the risk of deformation of the box 10 caused by the arching of the limiting strap 23.

[0104] For example, when the limiting pull strap 23 has a deformable part 232 and can deform, the natural length of the limiting pull strap 23 can be less than the sum of the dimensions of the two end plates 22 and each battery cell 21, so that the limiting pull strap 23 can not only adapt to assembly and processing errors, but also better provide constraints for the end plates 22.

[0105] The integrated busbar 24 refers to the electrical and signal management structure in the battery device 100. The integrated busbar 24 may include signal acquisition structures, such as flexible printed circuit (FPC), sampling harnesses, etc., and may also include electrical connection structures, such as copper busbars, aluminum busbars, etc.

[0106] Currently, the limiting pull strap 23 is usually set on the side of the integrated busbar 24 facing the battery cell 21. In this case, the integrated busbar 24 and the battery cell 21 can jointly press and constrain the limiting pull strap 23, thereby reducing the deformation of the limiting pull strap 23 and reducing the space occupied by the limiting pull strap 23. However, in this solution, the limiting pull strap 23 will exert a large force on the integrated busbar 24, which can easily lead to damage to the integrated busbar 24. The integrated busbar 24 usually includes flexible circuit boards, sampling harnesses, etc., and the repair of the integrated busbar 24 after damage is difficult and costly.

[0107] In view of this, the integrated busbar 24 is located between the limiting pull strap 23 and the battery cell assembly 20, that is, the integrated busbar 24 is located on the side of the limiting pull strap 23 away from the first wall 11. Under this arrangement, the deformation of the limiting pull strap 23 in the direction of the first wall 11 will hardly come into contact with the integrated busbar 24 and will hardly have a negative impact on the integrated busbar 24. At this time, the integrated busbar 24 does not need to be used to constrain the limiting pull strap 23, so the strength of the integrated busbar 24 can be reduced accordingly to reduce costs.

[0108] When the integrated busbar 24 is located on the side of the limiting pull strap 23 away from the first wall 11, the limiting pull strap 23 may contact the integrated busbar 24 or may not contact the integrated busbar 24 and may be spaced apart from the integrated busbar 24, so as to further reduce the risk of the limiting pull strap 23 damaging the integrated busbar 24.

[0109] Understandably, the purpose of setting the integrated busbar 24 on the side of the limiting pull belt 23 away from the first wall 11 is to reduce the risk of deformation of the limiting pull belt 23 damaging the integrated busbar 24. Therefore, the integrated busbar 24 can be directly opposite the limiting pull belt 23, or it can be partially or entirely offset from the limiting pull belt 23.

[0110] For example, in the height direction Z of the battery device 100, the limiting pull strap 23 is located on the side of the integrated busbar 24 facing the first wall 11; in the width direction Y of the battery device 100, the limiting pull strap 23 is directly opposite the integrated busbar 24; for example, in the height direction Z of the battery device 100, the limiting pull strap 23 is located on the side of the integrated busbar 24 facing the first wall 11; in the width direction Y of the battery device 100, the limiting pull strap 23 and the integrated busbar 24 are completely offset from each other and do not overlap.

[0111] Since the limiting pull belt 23 is located on the side of the integrated busbar 24 facing the first wall 11, the limiting pull belt 23 lacks constraints and its deformation is difficult to control; therefore, the limiting pull belt 23 includes a deformation part 232 so as to absorb the deformation of the limiting pull belt 23 through the deformation part 232 and reduce the deformation of the limiting pull belt 23.

[0112] In this embodiment, a deformable portion 232 is provided on the limiting pull strap 23, and the deformable portion 232 is deformable to absorb the size difference between the limiting pull strap 23 and the battery cell assembly 20. When the length of the limiting pull strap 23 is greater than the length of the battery cell assembly 20, the deformable portion 232 can deform first and absorb the size difference, thereby reducing the risk of overall deformation of the limiting pull strap 23 and reducing the height of the arching deformation of the limiting pull strap 23 in the first direction. The space occupied by the limiting pull strap 23 is reduced, thus reducing the risk of deformation of the housing 10. The integrated busbar 24 is set on the side of the limiting pull strap 23 away from the first wall 11 to reduce the risk of damage to the integrated busbar 24 caused by the deformation of the limiting pull strap 23. Since the limiting pull strap 23 is located on the side of the integrated busbar 24 facing the first wall 11, the limiting pull strap 23 lacks a limiting function. Therefore, a deformation part 232 is provided on the limiting pull strap 23 to reduce the overall deformation of the limiting pull strap 23.

[0113] refer to Figure 7 In some embodiments, at least a portion of the deformable portion 232 deforms in a direction away from the battery cell 21 and forms a bent portion 2321.

[0114] The bending portion 2321 refers to the structure formed by bending at least a portion of the deformable portion 232. The deformable portion 232 can deform at the bending portion 2321 and thereby absorb the displacement of the limiting pull strap 23. The deformable portion 232 bends away from the battery cell 21 to form the bending portion 2321. At this time, one end of the bending portion 2321 protrudes from the limiting pull strap 23 in the direction of the first wall 11. The bending portion 2321 can be a sharp corner structure formed by bending the deformable portion 232, or it can be an arc structure or other shapes. The number of bending portions 2321 can be one, or two or more. When the number of bending portions 2321 is one, the two ends of the bending portion 2321 are respectively connected to the main body portion 231 and the main body portion 231.

[0115] When there is only one bending portion 2321, and the length of the limiting pull strap 23 is greater than the sum of the dimensions of the two end plates 22 and each battery cell 21, the two ends of the main body 231 move closer to each other in the second direction. At this time, the two ends of the bending portion 2321 move accordingly, and the bending portion 2321 deforms synchronously. Since only the bending portion 2321 deforms rather than the entire limiting pull strap 23 deforms, the deformation of the bending portion 2321 in the first direction is relatively small.

[0116] By bending the deformable portion 232 away from the battery cell 21 to form a bent portion 2321, the risk of the deformable portion 232 colliding with the battery cell 21 after deformation and causing damage to the battery cell 21 can be reduced.

[0117] This embodiment provides a specific structure for the deformation portion 232, which includes a bending portion 2321. During the deformation of the limiting pull belt 23, the deformation portion 232 can deform before the bending portion 2321, so that the bending portion 2321 can absorb the deformation of the limiting pull belt 23 and guide the deformation portion 232 of the limiting pull belt 23, thereby reducing the arch height of the limiting pull belt 23 in the first direction.

[0118] refer to Figure 7 In some embodiments, there are at least two bends 2321, and each bend 2321 is connected sequentially along the second direction to form a wave structure.

[0119] There are at least two bent portions 2321, that is, there can be two, three or more bent portions 2321; each bent portion 2321 is connected in sequence along the second direction, and the two bent portions 2321 located at both ends along the second direction are connected to the main body portion 231 respectively.

[0120] Each bend 2321 can form a wave structure when they are adjacent. When the length of the limiting pull strap 23 is greater than the sum of the dimensions of the two end plates 22 and each battery cell 21, the two ends of the main body 231 move closer to each other in the second direction. At this time, the two ends of each bend 2321 move and move closer to each other. Each bend 2321 deforms. Each bend 2321 can absorb a part of the displacement at both ends of the main body 231, thereby further reducing the deformation of the deformed part 232 in the first direction.

[0121] When the length of the limiting pull strap 23 is less than the sum of the dimensions of the two end plates 22 and each battery cell 21, the two ends of the main body 231 move away from each other along the second direction. At this time, the two ends of each bending part 2321 move away from each other and each bending part 2321 deforms. Each bending part 2321 can absorb part of the displacement of the two ends of the main body 231 and can provide resistance to the displacement of the main body 231, so as to better constrain the two end plates 22.

[0122] During the expansion caused by the charge and discharge cycle of the battery cell 21, the two ends of the main body 231 move away from each other along the second direction. At this time, the two ends of each bend 2321 move away from each other and deform. Each bend 2321 can absorb part of the displacement of the two ends of the main body 231 and provide resistance to the displacement of the main body 231, so as to better constrain the two end plates 22 and suppress the expansion deformation of the battery cell 21.

[0123] This embodiment further improves the specific structure of some deformation parts 232, so that there are at least two bending parts 2321, and the bending parts 2321 are connected to form a wave structure. At this time, the deformation parts 232 can not only absorb the deformation of the limiting pull belt 23, but also provide resistance when the limiting pull belt 23 is subjected to tensile force, so that the limiting pull belt 23 can better provide constraint for the end plate 22.

[0124] In some embodiments, a portion of the deformable portion 232 deforms along a third direction to form a bent portion 2321, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0125] The bending portion 2321 refers to the structure formed by bending at least a portion of the deformable portion 232. The deformable portion 232 can deform at the bending portion 2321 and thereby absorb the displacement of the limiting strap 23. The deformable portion 232 bends along a third direction to form the bending portion 2321. At this time, one end of the bending portion 2321 protrudes from the limiting strap 23 along a third direction. The bending portion 2321 can be a sharp corner structure formed by bending the deformable portion 232, or it can be an arc structure or a structure of other shapes. The number of bending portions 2321 can be one, or two or more. When the number of bending portions 2321 is one, the two ends of the bending portion 2321 are respectively connected to the main body portion 231 and the main body portion 231.

[0126] The third direction can be the width direction Y of the battery device 100, or the length direction X of the battery device 100, or other directions; the third direction, the first direction, and the second direction are perpendicular to each other. For example, the third direction can be the width direction Y of the battery device 100, in which case the first direction can be the height direction Z of the battery device 100, and the second direction can be the length direction X of the battery device 100.

[0127] The third direction is different from the first and second directions, so that the deformable part 232 can guide the limiting pull strap 23 to deform in a direction different from the first and second directions, thereby reducing the space required for the limiting pull strap 23 in the first direction and reducing the risk of deformation of the box 10 caused by the deformation of the limiting pull strap 23.

[0128] When there is only one bending portion 2321, and the length of the limiting pull strap 23 is greater than the sum of the dimensions of the two end plates 22 and each battery cell 21, the two ends of the main body 231 move closer to each other in the second direction. At this time, the bending portion 2321 connected to the two ends of the main body 231 moves accordingly. The bending portion 2321 can deform in the third direction. Since only the bending portion 2321 deforms and not the entire limiting pull strap 23 deforms, the deformation of the bending portion 2321 in the first direction is small.

[0129] In this embodiment, the deformable portion 232 is deformed along the third direction to form a bent portion 2321, so that the deformable portion 232 can deform in the third direction and absorb the deformation of the limiting pull belt 23, and can further reduce the arch height of the limiting pull belt 23 in the first direction.

[0130] In some embodiments, in a first direction, the size of the deformable portion 232 is smaller than the size of the main body portion 231; and / or, in a third direction, the size of the deformable portion 232 is smaller than the size of the main body portion 231, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0131] The size of the deformable part 232 in the first direction and / or the third direction is smaller than the size of the main body part 231 in the corresponding direction, that is, the size of the deformable part 232 in one or more directions is smaller than the size of the main body part 231 in the corresponding direction.

[0132] For example, by reducing the thickness of the deformable portion 232 on one or both sides along the first direction, the size of the deformable portion 232 in the first direction is smaller than the size of the main body portion 231 in the first direction, thereby making the strength of the deformable portion 232 less than the strength of the main body portion 231.

[0133] For example, by reducing the width of the deformable portion 232 on one or both sides along the third direction, the size of the deformable portion 232 in the third direction is smaller than the size of the main body portion 231 in the third direction, thereby making the strength of the deformable portion 232 less than the strength of the main body portion 231.

[0134] This arrangement allows the strength of the deformable portion 232 to be less than that of the main body 231. When the length of the limiting pull strap 23 is not equal to the size of the two end plates 22 and each battery cell 21, this arrangement allows the deformable portion 232 to deform before the main body 231, thereby guiding the limiting pull strap 23 to deform at the deformable portion 232. This ensures that the deformation of the limiting pull strap 23 is mainly located at the deformable portion 232. Compared to the overall deformation of the limiting pull strap 23, this arrangement reduces the deformation of the limiting pull strap 23, thereby reducing the space occupied by the limiting pull strap 23 and reducing the risk of deformation of the housing 10 caused by the deformation of the limiting pull strap 23.

[0135] For example, the deformable part 232 can be an elastic structure. In this case, the material of the deformable part 232 can include an elastic material, such as metal, plastic or other materials, so that the deformable part 232 can both deform to absorb dimensional differences and recover for reuse.

[0136] This embodiment provides additional specific structures for the deformation portion 232, such that the dimensions of the deformation portion 232 in the first direction and / or the third direction are smaller than the dimensions of the main body portion 231, so that the deformation portion 232 becomes a lower strength part on the limiting pull strap 23, thereby guiding and changing the deformation position of the limiting pull strap 23; when the length of the limiting pull strap 23 is greater than the length of the battery cell assembly 20, the deformation portion 232 can deform first and thereby absorb the size difference, thereby reducing the height of the arching deformation of the limiting pull strap 23 in the first direction.

[0137] refer to Figure 9 , Figure 10 In some embodiments, the deformable portion 232 is an elastic structure, and the deformable portion 232 is provided with a first hole 2322; and / or, the deformable portion 232 is recessed with a groove 2323 along a first direction; and / or, the deformable portion 232 is recessed with a groove 2323 along a third direction, wherein the first direction, the second direction and the third direction are perpendicular to each other.

[0138] The first hole 2322 refers to the hole structure provided on the deformable part 232. The first hole 2322 can be a circular hole, a square hole, or a hole structure of other shapes. The first hole 2322 can be a straight hole, a conical hole, a stepped hole, or a hole structure of other shapes. The number of first holes 2322 can be one, or two or more.

[0139] The first hole 2322 may penetrate the deformed part 232 or may not penetrate the deformed part 232. That is, the first hole 2322 may be a through hole or a blind hole. When the first hole 2322 penetrates the deformed part 232, the first hole 2322 may penetrate the deformed part 232 along the first direction, or along the third direction or other directions.

[0140] When the first hole 2322 is provided on the deformable part 232, the size of the solid structure of the deformable part 232 at the first hole 2322 in the third direction is smaller than the size of the main body part 231 in the third direction.

[0141] A first hole 2322 is provided on the deformable part 232 so that the strength of the deformable part 232 is less than the strength of the main body part 231, and the strength of the deformable part 232 is less than the strength of the main body part 231, so as to guide the limiting pull belt 23 to deform at the deformable part 232, and so that the deformable part 232 can deform before the main body part 231 and the main body part 231.

[0142] The groove 2323 refers to the groove structure provided on the deformable part 232. The cross-sectional shape of the groove 2323 can be square, circular, trapezoidal or other shapes. The number of grooves 2323 can be one, two or more.

[0143] The groove 2323 can be recessed into the deformable part 232 along the first direction. At this time, the size of the groove 2323 in the third direction can be equal to the size of the deformable part 232 in the third direction, or the size of the groove 2323 in the third direction can be smaller than the size of the deformable part 232 in the third direction. That is, the groove 2323 can reduce the size of the deformable part 232 in the first direction as a whole, or it can reduce the size of a part of the deformable part 232 in the first direction. The groove 2323 can be located on one side of the deformable part 232 along the first direction, or it can be located on both sides of the deformable part 232 along the first direction.

[0144] For example, the groove 2323 is provided on opposite sides of the deformable part 232 along the first direction, and the size of the groove 2323 in the third direction is equal to the size of the deformable part 232 in the third direction, so that the overall size of the deformable part 232 in the first direction is smaller than the size of the main body 231 in the first direction, so that the deformable part 232 becomes the weakest part in strength of the limiting pull strap 23.

[0145] The groove 2323 can be recessed into the deformable part 232 along the third direction. At this time, the size of the groove 2323 in the first direction can be equal to the size of the deformable part 232 in the first direction, or the size of the groove 2323 in the first direction can be smaller than the size of the deformable part 232 in the first direction. That is, the groove 2323 can reduce the size of the deformable part 232 in the third direction as a whole, or it can reduce the size of a part of the deformable part 232 in the third direction. The groove 2323 can be located on one side of the deformable part 232 along the third direction, or it can be located on both sides of the deformable part 232 along the third direction.

[0146] For example, the groove 2323 is provided on opposite sides of the deformable part 232 along the third direction, and the size of the groove 2323 in the first direction is equal to the size of the deformable part 232 in the first direction, so that the overall size of the deformable part 232 in the third direction is smaller than the size of the main body 231 in the third direction. Even if the deformable part 232 becomes a narrow strip structure in the width direction of the limiting pull strap 23 compared with the main body 231, the deformable part 232 becomes a weak part in the strength of the limiting pull strap 23.

[0147] The deformable part 232 may have only one hole 2322 or a groove 2323, or both a hole 2322 and a groove 2323 may be provided on it. When the deformable part 232 has a groove 2323, the deformable part 232 may have a groove 2323 on one or both sides along the first direction or the third direction, or it may have a groove 2323 on one or both sides along the first direction and the third direction.

[0148] The deformable part 232 is an elastic structure. In this case, the material of the deformable part 232 can include elastic materials, such as metal, plastic or other materials, so that the deformable part 232 can deform more easily, so as to deform and absorb size differences, and at the same time, it can also be easy for the deformable part 232 to recover for reuse.

[0149] When the length of the limiting pull strap 23 is not equal to the dimensions of the two end plates 22 and each battery cell 21, this arrangement allows the deformation portion 232 to deform before the main body portion 231, thereby guiding the limiting pull strap 23 to deform at the deformation portion 232. This ensures that the deformation of the limiting pull strap 23 is mainly located at the deformation portion 232. Compared to the overall deformation of the limiting pull strap 23, this arrangement can reduce the deformation of the limiting pull strap 23, thereby reducing the space occupied by the limiting pull strap 23 and reducing the risk of deformation of the housing 10 caused by the deformation of the limiting pull strap 23.

[0150] In this embodiment, a first hole 2322 is provided on the deformable part 232, thereby making the strength of the deformable part 232 less than the strength of the main body part 231, thereby guiding and changing the deformation position of the limiting pull strap 23; when the length of the limiting pull strap 23 is greater than the length of the battery cell assembly 20, the deformable part 232 can deform first and thereby absorb the size difference, thereby reducing the height of the arching deformation of the limiting pull strap 23 in the first direction.

[0151] refer to Figure 9 In some embodiments, the first hole 2322 is a waist hole whose length direction is parallel to the second direction.

[0152] The first hole 2322 is a waist hole whose length direction is parallel to the second direction, that is, the length direction of the first hole 2322 is parallel to the length direction of the limiting pull strap 23; the number of the first holes 2322 can be one, two or more. When there are multiple first holes 2322, the multiple first holes 2322 can be arranged at intervals along the second direction or at intervals along a direction perpendicular to the second direction.

[0153] When the main body 231 and the main body 231 are subjected to force and displacement along the second direction, this arrangement can better cause the deformation part 232 to deform, so as to better absorb the displacement of the main body 231 and the main body 231 and reduce the risk of deformation of the main body 231 and the main body 231. As a result, the deformation of the limiting pull strap 23 can be mainly located at the deformation part 232, reducing the deformation of the limiting pull strap 23, reducing the space occupied by the limiting pull strap 23, and reducing the risk of deformation of the box 10 caused by the deformation of the limiting pull strap 23.

[0154] In this embodiment, the first hole 2322 is made into a waist hole so that the strength of the deformable part 232 is less than the strength of the main body part 231, so as to better guide and change the deformation position of the limiting pull belt 23.

[0155] refer to Figure 7 , Figure 9 In some embodiments, the deformable portion 232 is disposed adjacent to the end plate 22.

[0156] The deformable portion 232 is disposed adjacent to the end plate 22, that is, the deformable portion 232 is located at both ends of the limiting pull strap 23 near the end plate 22, and not in the middle of the limiting pull strap 23. There can be one or more deformable portions 232; when there is one deformable portion 232, the deformable portion 232 can be disposed adjacent to either end plate 22; when there are two deformable portions 232, the two deformable portions 232 can be disposed adjacent to two different end plates 22, or the two deformable portions 232 can be disposed adjacent to the same end plate 22; when there are three or more deformable portions 232, each deformable portion 232 can be disposed adjacent to two different end plates 22, or all of them can be disposed adjacent to a certain end plate 22.

[0157] The limiting pull strap 23 deforms and arches because its length is greater than the dimensions of the two end plates 22 and each battery cell 21, and the two ends of the limiting pull strap 23 connected to the end plates 22 move inward in the second direction. The arching deformation of the limiting pull strap 23 is greater the farther it is from the end plates 22, and the maximum arching deformation is reached in the middle of the limiting pull strap 23. Accordingly, the deformation part 232 is set near the end plates 22 so that the deformation part 232 deforms close to the end plates 22, thereby reducing the deformation. The deformation part 232 absorbs the deformation at both ends of the limiting pull strap 23, reducing the risk of arching in the middle of the limiting pull strap 23.

[0158] In this embodiment, since the deformation of the limiting pull strap 23 is greater the farther away from the end plate 22, the deformation part 232 is set near the end plate 22 to reduce the deformation of the deformation part 232, further reduce the space occupied by the limiting pull strap 23, and reduce the overall deformation of the limiting pull strap 23.

[0159] refer to Figures 3 to 7 In some embodiments, at least one end of the main body 231 is bent to form a connecting portion 2311, which is connected to the side of the corresponding end plate 22 away from the battery cell 21.

[0160] The connecting part 2311 refers to the structure in the limiting pull strap 23 used to connect with the end plate 22. The connecting part 2311 is formed by bending the main body 231. After bending, the connecting part 2311 can be connected to the side of the corresponding end plate 22 away from the battery cell 21, that is, the connecting part 2311 can be connected to the side of the end plate 22 along the second direction. The shape of the connecting part 2311 can be square, circular or other shapes.

[0161] The main body 231 can be bent at only one end to form a connecting part 2311, or the main body 231 can be bent at both ends to form two connecting parts 2311. In this case, the main body 231 is connected to the two end plates 22 respectively through the two connecting parts 2311.

[0162] Since the force borne by the limiting pull strap 23 is mainly along the second direction, the main body 231 is connected to the end plate 22 through the connecting part 2311, and the connecting part 2311 is connected to one side of the end plate 22 along the second direction. At this time, the supporting force provided by the end plate 22 to the connecting part 2311 is also along the second direction, so that the connection part 2311 and the end plate 22 can better fix the connecting part 2311 and better support the limiting pull strap 23.

[0163] In this embodiment, a bent connecting portion 2311 is provided on the main body 231 so that the main body 231 can be more stably connected to the corresponding end plate 22, thereby improving the connection stability between the limiting pull strap 23 and the end plate 22.

[0164] In some embodiments, the battery device 100 includes a housing 10 and a battery cell assembly 20.

[0165] The housing 10 has a receiving space 101, and the housing 10 includes a first wall 11 located on one side of the receiving space 101 along the height direction Z of the battery device 100, the first wall 11 being the top cover of the housing 10.

[0166] The battery cell assembly 20 is housed in the housing space 101. The battery cell assembly 20 includes two end plates 22 arranged at intervals along the length direction X of the battery device 100. A plurality of battery cells 21 are arranged between the two end plates 22. The two end plates 22 clamp each battery cell 21 along the length direction X of the battery device 100.

[0167] The battery cell assembly 20 also includes an integrated busbar 24, which is located on the side of each battery cell 21 facing the first wall 11.

[0168] The battery cell assembly 20 also includes a limiting pull strap 23, which is located on the side of the integrated busbar 24 facing the first wall 11. The limiting pull strap 23 includes a main body portion 231 and a deformation portion 232 located on the main body portion 231. The two ends of the main body portion 231 are respectively connected to two end plates 22, and the deformation portion 232 is adjacent to one of the two end plates 22.

[0169] The deformation section 232 includes a plurality of bending sections 2321, which are connected sequentially along the length direction X of the battery device 100 to form a wave-like structure.

[0170] The two ends of the main body 231 connected to the end plate 22 are bent downward to form connecting parts 2311. The connecting parts 2311 are connected to the side of the corresponding end plate 22 away from the battery cell 21 by bolts 251. The end of the main body 231 away from the deformation is bent downward to form connecting parts 2311. The connecting parts 2311 are connected to the side of the end plate 22 away from the battery cell 21 by bolts 251.

[0171] Secondly, some embodiments of this application also provide an energy storage device 1, including a battery device 100 provided in some embodiments of the first aspect; wherein the battery device 100 is used to store or provide electrical energy.

[0172] Energy storage device 1 includes one or more battery clusters to increase the voltage and capacity of energy storage device 1. A battery cluster may include multiple battery devices 100, which are connected in series via a busbar to increase the voltage of energy storage device 1. When energy storage device 1 includes multiple battery clusters, the battery clusters are connected in parallel to increase the capacity of energy storage device 1.

[0173] The energy storage device 1 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device 1 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 1 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires the use of the energy storage device 1.

[0174] In some embodiments, the energy storage device 1 is an energy storage container or an energy storage cabinet.

[0175] In some embodiments, the energy storage device 1 may include a cabinet and one or more battery clusters, with the battery clusters housed in the cabinet.

[0176] In some embodiments, the energy storage device 1 may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0177] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 100 via piping to regulate the temperature of the individual battery cells 21.

[0178] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0179] As an example, the central control module can serve as the battery management unit for energy storage device 1, used to monitor and manage it. The central control module can monitor information such as current, voltage, power, state of charge, and temperature of energy storage device 1. For example, it can control the charging and discharging current and voltage of energy storage device 1. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0180] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in the energy storage system.

[0181] As an example, the power distribution module can be used to distribute power to the modules in the energy storage device 1 that require electricity.

[0182] Thirdly, refer to Figure 11 Some embodiments of this application also provide an energy storage system, including an energy storage device 1 and a power conversion device 2 provided in some embodiments of the second aspect, wherein the power conversion device 2 is used to electrically connect a power generation device 3 and an energy storage device 1.

[0183] An energy storage system may include one or more energy storage devices 1 and a power conversion system 2 (PCS), wherein the power conversion system 2 is connected between a power generation device 3 and an energy storage device 1. The power generation device 3 generates electrical energy, which can be stored in the energy storage device 1 via the power conversion system 2. As an example, the power generation device 3 may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. The specific type of the power generation device 3 is not limited in this application.

[0184] Fourthly, refer to Figure 12 Some embodiments of this application also provide a charging network, including a charging pile 4 and an energy storage device 1 provided in some embodiments of the second aspect, or an energy storage system provided in some embodiments of the third aspect. The energy storage device 1 is used to provide electrical energy to the charging pile 4.

[0185] The charging pile 4 is electrically connected to the energy storage device 1, which provides power to the charging pile 4. The charging pile 4 is also electrically connected to the battery device 100 in the energy storage device 1 via a cable, and the battery device 100 can provide its stored electrical energy to the charging pile 4. The charging pile 4 has one or more connectors 5 for connecting to electrical equipment (such as vehicles) to replenish the power of the equipment.

[0186] The energy storage device 1 can be located inside the charging pile 4 (e.g., an integrated energy storage and charging unit) or outside the charging pile 4.

[0187] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A housing having a receiving space, the housing including a first wall located on one side of the receiving space along a first direction; A battery cell assembly is housed in the receiving space. The battery cell assembly includes a limiting pull strap, at least two battery cells, and two end plates. The two end plates are spaced apart along a second direction, and at least two battery cells are disposed between the two end plates. The second direction is perpendicular to the first direction. The limiting strap includes a main body and a deformable part disposed on the main body, and the two ends of the main body are respectively connected to the two end plates; The battery cell assembly also includes an integrated busbar, which is located on the side of the battery cell assembly facing the first wall. The limiting pull strap is located on the side of the integrated busbar facing the first wall, and the limiting pull strap does not contact the integrated busbar and is spaced apart from it.

2. The battery device according to claim 1, characterized in that, At least a portion of the deformable portion deforms in a direction away from the battery cell and forms a bent portion.

3. The battery device according to claim 2, characterized in that, There are at least two bends, and each bend is connected in sequence along the second direction to form a wave structure.

4. The battery device according to claim 1, characterized in that, A portion of the deformable part deforms along a third direction to form a bent portion, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

5. The battery device according to claim 1, characterized in that, In the first direction, the size of the deformed portion is smaller than the size of the main body portion; and / or In the third direction, the size of the deformable part is smaller than the size of the main body part, and the first direction, the second direction and the third direction are perpendicular to each other.

6. The battery device according to claim 1, characterized in that, The deformable part is an elastic structure, and the deformable part has a first hole; and / or The deformable portion is recessed along the first direction; and / or The deformable part is recessed along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

7. The battery device according to claim 6, characterized in that, The first hole is a waist hole whose length direction is parallel to the second direction.

8. The battery device according to any one of claims 1-7, characterized in that, The deformable portion is disposed adjacent to the end plate.

9. The battery device according to any one of claims 1-7, characterized in that, At least one end of the main body is bent to form a connecting portion, which is connected to the side of the corresponding end plate opposite to the battery cell.

10. An energy storage device, characterized in that, Includes a battery device as described in any one of claims 1-9, the battery device being used to store or provide electrical energy.

11. An energy storage system, characterized in that, Including the energy storage device as described in claim 10; and A power conversion device connected to the energy storage device to perform power conversion on the current input to or output from the energy storage device.

12. A charging network, characterized in that, Includes the energy storage device as described in claim 10 or the energy storage system as described in claim 11; and A charging pile, wherein the energy storage device is used to provide electrical energy to the charging pile.

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