Battery device, energy storage system and electric device

Abstract

The embodiment of the present application relates to the field of battery device, and provides a battery device, an energy storage system and an electric equipment. The battery device comprises: a battery body comprising a plurality of parallelly arranged battery cells; a belt assembly connected with the battery body to fix the plurality of battery cells; at least part of the belt assembly is deformedly arranged along an extension direction of the belt assembly to be elongated along with expansion of the battery body; and an elastic part is arranged on the belt assembly along the extension direction of the belt assembly to be elongated along with expansion of the battery body, to be restored along with retraction of the battery body, and to drive at least part of the belt assembly to be restored. The battery device provided by the embodiment of the present application can at least improve the adaptability of the belt during expansion and contraction of the battery cell.

Description

Technical Field

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

[0002] Currently, battery modules typically contain several cells connected in series or parallel. These cells undergo varying degrees of expansion and contraction during charging and discharging, especially in large-capacity batteries and at the 60% to 70% EOL (End of Life) stage, where cell expansion is particularly pronounced. To maintain the stability of the module structure and enhance thermal management performance, battery modules typically use straps to secure the cells.

[0003] However, traditional cable ties have a fixed length in the length direction of the battery module and do not have a length adjustment function. They cannot effectively adapt to the expansion and contraction of the battery cells, which may lead to excessive compression or loosening of the battery cells, seriously affecting the cycle life and safety of the battery module. Summary of the Invention

[0004] This application provides a battery device, energy storage system, and electrical equipment, which at least helps to improve the adaptability of the cable bundle during the expansion and contraction of the battery cell.

[0005] According to some embodiments of this application, one aspect of this application provides a battery device, including:

[0006] The battery body includes multiple cells arranged in parallel.

[0007] A strap assembly is connected to the battery body to secure multiple battery cells; at least a portion of the strap assembly is deformably disposed along the extension direction of the strap assembly to elongate as the battery body expands.

[0008] An elastic portion extends along the extension direction of the strap assembly and is disposed on the strap assembly so as to elongate with the expansion of the battery body and recover with the retraction of the battery body, thereby causing at least a portion of the strap assembly to recover.

[0009] In some embodiments, the strap assembly includes a strap body and a deformable portion, the deformable portion being disposed on the strap body and forming at least a portion of the strap assembly;

[0010] One end of the elastic part is connected to one end of the deformable part, and the other end of the elastic part is connected to the other end of the deformable part.

[0011] In some embodiments, the deformable portion includes at least two deformable connectors connected sequentially along the extension direction of the strap body, wherein one of two adjacent deformable connectors is movably disposed relative to the other to adjust the overall length of the at least two deformable connectors along the extension direction of the strap body.

[0012] In some embodiments, both ends of the deformable portion are hinged to the main body of the strap, and two adjacent deformable connecting members are hinged to each other; or...

[0013] Both adjacent deformable connectors are tubular structures, and one of the two adjacent deformable connectors is sleeved on the other and is movably arranged along the extension direction of the main body of the strap.

[0014] In some embodiments, at least a portion of the strap assembly includes a folded structure; wherein:

[0015] The folding structure includes a first folded piece, a second folded piece, and a third folded piece connected sequentially along the extension direction of the strap assembly. The first and second folded pieces are arranged opposite to each other, and the second and third folded pieces are arranged opposite to each other; and / or,

[0016] The folding structure is an S-shaped structure; and / or,

[0017] There are multiple folding structures, which are connected sequentially along the extension direction of the strap assembly.

[0018] In some embodiments, there are multiple deformable portions and multiple elastic portions, with multiple deformable portions spaced apart on the strap body, and multiple deformable portions and multiple elastic portions are arranged in a one-to-one correspondence.

[0019] In some embodiments, the elastic portion is located on at least one side of the strap assembly; the elastic portion includes an elastic body and two mounting members, the elastic body extends along the extension direction of the strap assembly, one end of the elastic body and the other end are respectively connected to the two mounting members, and both mounting members are fixed to the strap assembly.

[0020] In some embodiments, the strap assembly includes a strap body and a deformable portion, the deformable portion forming at least a portion of the strap assembly; a mounting hole is provided through the deformable portion along the extending direction of the strap body; the elastic portion includes an elastic body and a mounting member, the mounting member being connected to an end of the elastic body, and the elastic body passing through the mounting hole; wherein:

[0021] The mounting member is located at the end of the deformable part and is disposed opposite to the mounting hole. The outer edge of the mounting member protrudes beyond the edge of the mounting hole, and the mounting member is used to abut against the end of the deformable part; and / or,

[0022] There are at least two elastic bodies and at least two mounting holes, with each elastic body and mounting hole corresponding to the other.

[0023] In some embodiments, the strap assembly extends along the length direction of the battery body;

[0024] Wherein, at least a portion of the strap assembly has a maximum deformation length greater than 0 mm and less than or equal to A mm in the extension direction of the strap assembly; where A = 2n, and n is the number of cells.

[0025] In some embodiments, the battery body further includes an end plate located at the end of a plurality of cells, and the end plate is provided with a mounting groove; one end of the strap body is fixed to one side of the battery body, and the other end of the strap body is fixed to the other side of the battery body; the strap assembly further includes:

[0026] The spiral section is wound around a preset central axis, with the end of the spiral section away from the preset central axis being a free end, which is connected to the end of the strap body; the spiral section is set in the mounting groove.

[0027] In some embodiments, the free end extends along a first preset direction, and the end of the strap body extends along a second preset direction, the first preset direction and the second preset direction intersecting each other; the strap assembly further includes:

[0028] A torsion connector, one end of which is connected to a free end and the other end of which is connected to the end of the strap body. The torsion connector has a torsion surface, which is used to abut and limit the movement against the edge of the mounting groove.

[0029] In some embodiments, the battery body further includes a buffer heat insulation pad disposed between two adjacent battery cells; wherein:

[0030] The hardness of the cushioning and heat insulation pad is greater than or equal to 30 HV and less than or equal to 60 HV; and / or,

[0031] The thermal conductivity of the buffer insulation pad is less than or equal to 0.05 W / (m·K).

[0032] According to some embodiments of this application, another aspect of this application provides an energy storage system including the battery device provided above.

[0033] According to some embodiments of this application, another aspect of this application provides an electrical device including the battery device provided above.

[0034] The technical solution provided in this application has at least the following advantages:

[0035] The deformable portion of the strap assembly can naturally deform along with the expansion and contraction of the battery body during charging and discharging. This effectively absorbs the stress generated during cell expansion, avoiding excessive mechanical pressure on the cells and thus extending the lifespan of the cells and the entire battery device. Traditional strap assemblies typically only passively adapt to the increase in size of the battery body during expansion. However, when the battery discharges or cools down, the retracted battery body is not effectively supported, and the strap assembly often cannot actively retract, leading to increased gaps between cells and affecting the overall structural stability and energy density of the module. The introduced elastic portion has bidirectional adjustment capabilities. It not only extends along with the battery body during expansion but, more importantly, actively restores its original shape when the battery body retracts, causing at least a portion of the strap assembly to retract accordingly, tightly securing the cells again, thereby maintaining the consistency and high efficiency of the battery module. The coordinated work of at least a portion of the strap assembly and the elastic portion ensures that the dynamic dimensional changes of the cells during charging and discharging are smoothly absorbed and released. This mechanism avoids the pressure and compression of the battery cell under extreme expansion conditions, and also prevents gaps caused by the stiffness of the strap assembly when the battery cell retracts, effectively extending the cycle life of the battery body, reducing the failure rate, and improving the reliability of the battery device. Therefore, the technical solution provided by the embodiments of this application can solve the problem in the prior art that the strap of the battery module cannot adjust its length with the expansion and contraction of the battery cell. Attached Figure Description

[0036] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the drawings in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this application or in the conventional art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0038] Figure 2 A partial structural schematic diagram of the strap assembly of a battery device provided in an embodiment of this application;

[0039] Figure 3 This is a schematic diagram of the structure of a modified portion of a battery device provided in an embodiment of this application;

[0040] Figure 4 This is a schematic diagram of the structure of the elastic part of a battery device provided in an embodiment of this application;

[0041] Figure 5 This is a schematic diagram of the structure of the strap assembly of a battery device provided in an embodiment of this application in its initial state;

[0042] Figure 6 A schematic diagram of the structure of the strap assembly of a battery device provided in an embodiment of this application in a stretched state;

[0043] Figure 7 A partial structural diagram of the strap assembly of a battery device provided in an embodiment of this application in its initial state;

[0044] Figure 8 This is a partial structural schematic diagram of a battery device provided in an embodiment of this application;

[0045] Figure 9 This is a schematic diagram of the structure of the vortex section of a battery device provided in an embodiment of this application.

[0046] The above figures include the following reference numerals:

[0047] 1. Battery body; 11. Cell; 12. End plate; 121. Mounting groove; 1211. Groove edge; 13. Buffer heat insulation pad; 14. Top cover plate; 15. Integrated busbar; 2. Strap assembly; 21. Strap body; 22. Deformable part; 220. Deformable connector; 221. First folded piece; 222. Second folded piece; 223. Third folded piece; 224. Mounting hole; 225. Rivet; 23. Elastic part; 231. Elastic body; 232. Mounting piece; 24. Spiral part; 241. Free end; 25. Torsion connector; 251. Torsion surface; X1. First preset direction; X2. Second preset direction. Detailed Implementation

[0048] As can be seen from the background technology, the straps of existing battery modules cannot adjust their length according to the expansion and contraction of the battery cells.

[0049] This application provides a battery device to solve the problem that the strap of the battery module in the prior art cannot adjust its length according to the expansion and contraction of the battery cell.

[0050] 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.

[0051] 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.

[0052] 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 three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0053] 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).

[0054] 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.

[0055] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the 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.

[0056] In the accompanying drawings corresponding to the embodiments of this application, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0057] In the description of the embodiments of this application, when a component "includes" another component, other components are not excluded unless otherwise stated, and other components may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly on" the other component (i.e., located on the surface of the other component with no other components between them), or another component may be present therein. Moreover, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located therein.

[0058] The terminology used in the description of the various embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments and the appended claims, the term "part" is also intended to include the plural form unless the context clearly indicates otherwise. Components include layers, films, regions, or plates, etc.

[0059] The embodiments of this application will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this application to facilitate a better understanding of the application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0060] like Figures 1 to 9As shown, an embodiment of the present invention provides a battery device, which includes a battery body 1, a strap assembly 2, and an elastic portion 23. The battery body 1 includes a plurality of battery cells 11 arranged in parallel. The strap assembly 2 is connected to the battery body 1 to fix the plurality of battery cells 11; at least a portion of the strap assembly 2 is deformably disposed along its extending direction to elongate as the battery body 1 expands. The elastic portion 23 extends along the extending direction of the strap assembly 2 and is disposed on the strap assembly 2 to elongate as the battery body 1 expands and return to its original position as the battery body 1 retracts, thereby causing at least a portion of the strap assembly 2 to return to its original position.

[0061] The battery device provided by one embodiment of the present invention allows the deformable portion of the strap assembly 2 to naturally deform with the expansion and contraction of the battery body 1 during charging and discharging. This effectively absorbs the stress generated during the expansion of the battery cell 11, avoiding excessive mechanical pressure on the battery cell 11 and thus extending the service life of the battery cell 11 and even the entire battery device. Traditional strap assemblies 2 typically only passively adapt to the expansion of the battery body 1. However, when the battery discharges or cools, the retracted battery body 1 is not effectively supported, and the strap assembly 2 often cannot actively retract, leading to increased gaps between the battery cells 11 and affecting the overall structural stability and energy density of the module. The introduced elastic portion 23 has bidirectional adjustment capability. Not only can it extend with the expansion of the battery body 1, but more importantly, when the battery body 1 retracts, the elastic portion 23 actively restores its original shape, causing at least a portion of the strap assembly 2 to retract accordingly, tightly fixing the battery cell 11 again, thereby maintaining the consistency and high efficiency of the battery module. At least a portion of the strap assembly 2 works in conjunction with the elastic portion 23 to ensure that the dynamic dimensional changes of the cell 11 during charging and discharging are smoothly absorbed and released. This mechanism avoids the cell 11 being squeezed under extreme expansion and also prevents gaps caused by the stiffness of the strap assembly 2 when the cell 11 retracts, effectively extending the cycle life of the battery body 1, reducing the failure rate, and improving the reliability of the battery device. Therefore, the battery device provided in this embodiment can solve the problem in the prior art where the strap of the battery module cannot adjust its length according to the expansion and contraction of the cell.

[0062] Specifically, such as Figure 1As shown, the battery body 1 is a battery module, with each battery cell 11 arranged in parallel and secured in position by a strap assembly 2. The battery body 1 also includes an integrated busbar 15 and a top cover 14. Each battery cell 11 is connected to the integrated busbar 15. The top cover 14 covers the integrated busbar 15 and multiple battery cells 11. This ensures the stable arrangement and fixation of the battery cells 11 within the battery module, preventing damage caused by vibration or movement during transportation, and enhancing the overall structural stability and reliability of the battery module. Simultaneously, the orderly parallel arrangement of the battery cells 11 optimizes space utilization and improves battery energy density, which is crucial for enhancing the performance of the battery energy storage system.

[0063] Specifically, the strap assembly 2 is a metal strip structure. This structure provides the metal strip with excellent mechanical strength and physical stability, enabling it to withstand the pressure from the expansion of the battery cell 11. Furthermore, it can adapt to changes in the volume of the battery cell 11 through appropriate deformation when necessary, ensuring the structural integrity of the battery module under different operating conditions. The high thermal conductivity of the metal material also helps improve the heat dissipation performance of the battery module, thereby further enhancing the battery's lifespan and safety.

[0064] Specifically, the strap assembly 2 is a steel strip structure. In this way, the high hardness and toughness of the steel strip allow it to deform and elongate when subjected to the expansion pressure of the battery cell 11, and retract back to its original position during discharge thanks to the action of the elastic part 23, perfectly matching the dynamic dimensional changes of the battery module.

[0065] Specifically, the strap assembly 2 includes a strap body 21 and a deformable portion 22. The deformable portion 22 is disposed on the strap body 21 and forms at least a portion of the strap assembly 2. One end of an elastic portion 23 is connected to one end of the deformable portion 22, and the other end of the elastic portion 23 is connected to the other end of the deformable portion 22. With this structural arrangement, by combining the deformable portion 22 and the elastic portion 23 on the strap assembly 2, this design allows the strap assembly 2 to respond to the expansion and contraction of the battery body 1 while maintaining overall structural stability. The presence of the deformable portion 22 allows the strap assembly 2 to elongate through local deformation when the cell 11 expands, thereby reducing the mechanical pressure on the cell 11 and avoiding performance degradation and safety issues caused by excessive compression of the cell 11. Furthermore, the connection between the elastic portion 23 and the deformable portion 22 at both ends ensures that the strap assembly 2 can quickly return to its original shape when the cell 11 retracts. When the elastic portion 23 returns from a stretched state to a relaxed state, the connection at both ends can drive the deformable portion 22 to return to its original state. This not only maintains the compactness of the battery module but also ensures that the cell 11 is subjected to uniform force throughout the entire charge and discharge cycle, significantly improving the lifespan and safety performance of the battery device. This dynamic adjustment capability greatly enhances the adaptability and flexibility of the strap assembly 2 compared to the traditional static fixing method.

[0066] Specifically, the deformable section 22 includes at least two deformable connectors 220, which are sequentially connected along the extension direction of the strap body 21. One of two adjacent deformable connectors 220 is movably arranged relative to the other to adjust the overall length of the at least two deformable connectors 220 along the extension direction of the strap body 21. With this structural arrangement, when the cell 11 expands, the strap assembly 2 gradually elongates through the relative movement between the deformable connectors 220, ensuring that the expansion change of the cell 11 is absorbed smoothly and gradually, avoiding sudden stress concentration. Similarly, when the size of the cell 11 returns to normal, the deformable connectors 220 can quickly adjust their relative positions, allowing the strap assembly 2 to retract to a suitable length and tightly bind the cell 11 again. Multiple deformable connectors 220 can provide fine deformation adjustment, reduce undue pressure on the cell 11, and enhance the tensile strength and overall elasticity of the strap assembly 2, further improving the performance and reliability of the battery device under various operating conditions.

[0067] In one embodiment, such as Figures 5 to 7As shown, both ends of the deformable portion 22 are hinged to the strap body 21, and two adjacent deformable connectors 220 are hinged to each other. When the cell 11 expands, the strap assembly 2 changes from its initial state to a stretched state; when the cell 11 retracts, the strap assembly 2 returns from the stretched state to its initial state. This structural arrangement, with its hinged design, allows the deformable portion 22 to rotate relative to the strap body 21 around the hinge point, and the two adjacent deformable connectors 220 can also rotate relative to each other around the hinge point, giving the deformable portion deformation capability. Specifically, the hinged structure of the deformable portion 22 allows it to rotate and deform along the hinge point when the cell 11 expands, thereby extending the overall length of the strap assembly 2 to adapt to changes in the size of the battery body 1. Simultaneously, the hinged mechanism ensures that the strap assembly 2 can quickly reset when the cell 11 retracts, reducing the gap between the cells 11 and maintaining the structural compactness of the battery module and the accuracy of the cell 11 positioning. The application of the hinge structure on the belt assembly 2 significantly enhances its adaptive adjustment capability and stress dispersion effect, thereby improving the stability and safety performance of the battery device under dynamic operating conditions.

[0068] Specifically, such as Figure 7 As shown, both ends of the deformable part 22 are hinged to the strap body 21 via rivets 225, and adjacent deformable connectors 220 are hinged to each other via rivets 225. When the strap assembly 2 is in its initial state, adjacent deformable connectors 220 intersect each other. The deformable connectors 220 and the strap body 21 intersect each other; when the strap assembly 2 is in a stretched state, the deformable connectors 220 and the strap body 21 both extend in the same direction. In this way, the hinged structure connected by rivets 225 ensures the stability and reliability of the deformable connectors 220 during movement, avoiding wear or failure at the connection point due to changes in the size of the battery module.

[0069] In one embodiment, both adjacent deformable connectors 220 are tubular structures, with one of them sleeved on the other and movably disposed along the extension direction of the strap body 21. This structural arrangement enhances the adaptability of the strap assembly 2 through the mobility of one deformable connector 220 on the other. When the battery body 1 expands due to the expansion of the cell 11, the deformable connectors 220 in the sleeve structure can extend the length of the strap assembly 2 through relative sliding. This process is smooth and requires no additional drive mechanism, relying entirely on the thrust generated when the cell 11 expands. Conversely, during discharge, the excess length can be eliminated by the return movement of the sleeve, restoring the original size of the battery module. The sleeve-type deformable part 22 design not only simplifies the structure and reduces manufacturing costs but also improves the flexibility and responsiveness of the strap assembly 2, ensuring efficient self-adjustment of the battery device in the face of size changes.

[0070] In one embodiment, at least a portion of the strap assembly 2 includes a folding structure. The folding structure is foldably configured along the extending direction of the strap assembly 2. With this configuration, when the battery body 1 expands, the folding structure can unfold and extend, providing the necessary space for the expansion of the battery cells 11 and preventing compression between the cells 11. When the cells 11 retract, the folding portion can naturally fold, rapidly reducing the length of the strap assembly 2, ensuring that the cells 11 are tightly arranged, reducing gaps between the cells 11, and improving the space utilization efficiency and energy density of the battery module.

[0071] Specifically, the folding structure includes a first folding piece 221, a second folding piece 222, and a third folding piece 223 connected sequentially along the extension direction of the strap assembly 2. The first folding piece 221 and the second folding piece 222 are arranged opposite to each other, and the second folding piece 222 and the third folding piece 223 are arranged opposite to each other. This structural arrangement, with its connection method of the folding pieces, forms a Z-shaped structure. When the battery cell 11 expands, causing the length of the battery body 1 to increase, this Z-shaped folding structure can extend the overall length of the strap assembly 2 through the relative rotation between the first folding piece 221 and the second folding piece 222, and between the second folding piece 222 and the third folding piece 223, without exerting additional pressure on the battery cell 11. Conversely, when the battery cell 11 retracts, the folding pieces can quickly recover, tightening the strap assembly 2 and ensuring that the battery cells 11 are tightly arranged.

[0072] Specifically, such as Figure 2 and Figure 3 As shown, the folding structure is an S-shaped structure. Compared to straight or simple bending structures, the S-shaped structure has better stress dispersion capabilities and a larger deformation range. The S-shaped strap assembly 2 can extend more naturally when the battery cell 11 expands, with a smoother deformation path, avoiding stress concentration and material damage that may occur at sharp turning points. At the same time, the S-shaped structure has stronger resilience; when the battery cell 11 shrinks back to its original size, the S-shaped structure can fold back more smoothly, reducing residual stress and ensuring the long-term performance of the strap assembly 2.

[0073] Specifically, there are multiple folding structures, which are connected sequentially along the extension direction of the strap assembly 2. This enhances the adaptability and adjustment range of the strap. When the size of the battery body 1 changes significantly, a single folding structure may not be able to meet the required extension or folding range, while the combination of multiple folding structures provides greater flexibility, ensuring that the strap assembly 2 can always match the dynamic dimensions of the battery body 1. In addition, the design of multiple folding structures can more evenly distribute the stress generated when the cell 11 expands or contracts, reducing the possibility of local stress concentration and further improving the durability of the strap assembly 2 and the safety of the battery module.

[0074] In one embodiment, at least a portion of the strap assembly 2 includes a folding structure. The folding structure includes a first folding piece 221, a second folding piece 222, and a third folding piece 223 connected sequentially along the extension direction of the strap assembly 2. The first folding piece 221 and the second folding piece 222 are arranged opposite to each other, and the second folding piece 222 and the third folding piece 223 are arranged opposite to each other. The folding structure is S-shaped. This S-shaped folding structure design improves the stretchability and stress dispersion capability of the strap assembly 2. When the battery body 1 expands or contracts due to the charging and discharging of the battery cells 11, the S-shaped folding structure can dynamically adjust the length of the strap assembly 2 through the relative rotation between the first folding piece 221, the second folding piece 222, and the third folding piece 223. This effectively avoids excessive compression or separation between the battery cells 11, protecting the battery cells 11 from mechanical stress damage, thereby extending the service life of the battery module. The S-shaped structure also allows for smooth extension and folding, reducing local stress concentration and improving the reliability and durability of the strap assembly 2 during repeated use.

[0075] In one embodiment, at least a portion of the strap assembly 2 includes a folded structure. The folded structure includes a first folded piece 221, a second folded piece 222, and a third folded piece 223 connected sequentially along the extension direction of the strap assembly 2. The first folded piece 221 and the second folded piece 222 are disposed opposite to each other, and the second folded piece 222 and the third folded piece 223 are disposed opposite to each other. Multiple folded structures are provided, and these multiple folded structures are connected sequentially along the extension direction of the strap assembly 2. This structural arrangement allows the strap assembly 2 to expand in more precise layers when subjected to the expansion of the battery body 1, avoiding irreversible damage to the material caused by excessive deformation. Simultaneously, the multi-layered folded structure can quickly recover when the battery cell 11 contracts, ensuring the structural stability of the battery module and the tight contact between the battery cells 11.

[0076] In one embodiment, at least a portion of the strap assembly 2 includes a folded structure. The folded structure is an S-shaped structure. Multiple S-shaped structures are connected sequentially along the extension direction of the strap assembly 2. This series connection of multiple S-shaped folded structures allows the strap assembly 2 to smoothly extend through multiple S-shaped inflection points when the battery body 1 expands, effectively dispersing pressure and reducing stress concentration at individual folding points, thereby protecting the cell 11 structure from damage. When the cell 11 shrinks in size, the multi-layered S-shaped folded structure can quickly recover, maintaining the tightness of the strap assembly 2 and ensuring optimal contact between the cells 11, which is beneficial for improving the thermal conductivity and energy output consistency of the battery module. Furthermore, the multi-layered design of the S-shaped structure increases the elasticity of the strap assembly 2, enabling it to better buffer and absorb stress when facing external impacts or vibrations, enhancing the mechanical stability and durability of the battery module.

[0077] In one embodiment, at least a portion of the strap assembly 2 includes a folded structure. The folded structure includes a first folded piece 221, a second folded piece 222, and a third folded piece 223 connected sequentially along the extension direction of the strap assembly 2. The first folded piece 221 and the second folded piece 222 are arranged opposite to each other, and the second folded piece 222 and the third folded piece 223 are arranged opposite to each other. The folded structure is an S-shaped structure. Multiple S-shaped structures are connected sequentially along the extension direction of the strap assembly 2. Thus, the strap assembly 2 employs multiple S-shaped structures as a deformation structure. The multi-layer arrangement of the S-shaped folded structure provides a greater range of expansion and contraction, allowing the strap assembly 2 to adjust its length more flexibly when the battery cell 11 expands, avoiding hard collisions or compression between the battery cells 11, reducing internal stress within the battery cells 11, and having a significant positive impact on battery capacity retention and cycle life. Simultaneously, the design of multiple S-shaped structures ensures rapid resetting of the strap assembly 2 during the retraction process of the battery cell 11, maintaining the compactness of the battery module and good contact between the battery cells 11, optimizing the battery's thermal management and electrical connection performance. This design reduces the impact of external shocks on the belt assembly 2 and the overall structure of the battery module by dispersing stress at multiple points, thereby improving the shock resistance and safety of the battery device.

[0078] In one embodiment, there are multiple deformable portions 22 and multiple elastic portions 23. The multiple deformable portions 22 are spaced apart on the strap body 21, and the multiple deformable portions 22 and multiple elastic portions 23 are arranged in a one-to-one correspondence. This structural arrangement allows the distribution of the multiple deformable portions 22 to more comprehensively cover the battery body 1, ensuring timely response to any expansion or contraction of the cell 11 at any location, thereby reducing local stress concentration and protecting the cell 11 from damage. The corresponding multiple elastic portions 23 play a crucial role in adjustment and buffering; they provide elastic restoring force to the corresponding deformable portions 22, enabling the strap assembly 2 to quickly return to its original state and maintain close contact between the cells 11. Furthermore, this one-to-one correspondence design ensures uniform stress distribution, preventing cell 11 compression or loosening problems that may be caused by uneven elastic force distribution, which plays an important role in improving the overall performance and extending the lifespan of the battery module.

[0079] In one embodiment, such as Figures 5 to 7As shown, the elastic part 23 is located on at least one side of the strap assembly 2. The elastic part 23 includes an elastic body 231 and two mounting members 232. The elastic body 231 extends along the extension direction of the strap assembly 2, and one end and the other end of the elastic body 231 are respectively connected to the two mounting members 232. Both mounting members 232 are fixed to the strap assembly 2. With this structural arrangement, the elastic part 23 is located on one side of the strap assembly 2. Through the combination of the elastic body 231 and the two mounting members 232, the high efficiency and stability of the extension and retraction adjustment of the strap assembly 2 are achieved. The elastic body 231 is arranged along the extension direction of the strap assembly 2, ensuring that it can stretch when the cell 11 expands. When the cell 11 contracts, it can provide a restoring force along the extension direction of the strap assembly 22, so that the length of the deformable part 22 is restored. The fixed connection between the mounting component 232 and the strap assembly 2 not only simplifies the installation process of the elastic part 23 and improves assembly efficiency, but also provides a solid support point, enabling the elastic body 231 to more effectively exert its elastic adjustment function. This side-mounted elastic part 23 design can make reasonable use of space under the condition of limited internal space of the battery module, and improve the overall compactness of the battery device design.

[0080] In one embodiment, the elastic body 231 is a spring structure. This spring structure design allows the strap assembly 2 to elongate and deform when the battery cell 11 expands, and when the battery cell 11 shrinks or returns to its original shape, the spring can quickly release the stored energy, causing the strap to return to its original length and maintaining close contact between the battery cells 11.

[0081] In one embodiment, the elastic body 231 is a bellows structure. In this way, the bellows structure can smoothly extend and contract with the expansion and contraction of the battery cell 11. This dynamic adjustment not only avoids direct mechanical pressure on the battery cell 11, but also ensures proper fixation of the battery cell 11 under different charging and discharging states, reduces friction and wear between the battery cells 11, and helps maintain the structural integrity of the battery module and the electrical performance of the battery cells.

[0082] In one embodiment, the elastic body 231 is made of rubber or an elastic polymer. Rubber or elastic polymers typically possess excellent fatigue resistance and high elastic recovery, maintaining a stable elastic state even under prolonged pressure cycles of expansion and contraction of the cell 11, effectively preventing performance degradation of the cell 11 due to excessive compression or relaxation. Furthermore, these materials are lightweight, reducing the overall weight of the strap assembly 2 and improving the portability of the battery device.

[0083] Specifically, the mounting component 232 is welded to the strap assembly 2. This ensures a secure connection between the two, guaranteeing the structural integrity and functional reliability of the strap assembly 2 even when the battery module size changes.

[0084] In one embodiment, such as Figures 2 to 4 As shown, the strap assembly 2 includes a strap body 21 and a deformable portion 22, with the deformable portion 22 forming at least a part of the strap assembly 2. A mounting hole 224 is provided through the deformable portion 22 along the extending direction of the strap body 21. The elastic portion 23 includes an elastic body 231 and a mounting member 232, with the mounting member 232 connected to the end of the elastic body 231, which passes through the mounting hole 224. This structural arrangement, with the through mounting hole 224 in the deformable portion 22 and the elastic body 231 passing through it, forms a dynamic adjustment mechanism. This design allows the strap length to be automatically adjusted by the deformation of the deformable portion 22 and the expansion and contraction of the elastic portion 23 when the battery module size changes. The presence of the mounting hole 224 not only ensures the correct positioning of the elastic portion 23 but also allows it to move freely within a certain range to accommodate the expansion and contraction of the battery module. The connection between the elastic body 231 and the mounting member 232 provides a stable fulcrum, ensuring the responsiveness and stability of the elastic portion 23 during deformation. This design significantly improves the adaptability of the strap assembly 2 to changes in battery size and reduces mechanical stress between cells 11, thereby improving the working efficiency and overall lifespan of the battery module.

[0085] In one embodiment, the strap assembly 2 includes a strap body 21 and a deformable portion 22, the deformable portion 22 forming at least a part of the strap assembly 2; a mounting hole 224 is provided through the deformable portion 22 along the extending direction of the strap body 21; the elastic portion 23 includes an elastic body 231 and a mounting member 232, the mounting member 232 being connected to the end of the elastic body 231, the elastic body 231 being disposed within the mounting hole 224. The mounting member 232 is located at the end of the deformable portion 22 and is disposed opposite to the mounting hole 224, the outer edge of the mounting member 232 protruding from the edge of the mounting hole 224, and the mounting member 232 being used to abut against the end of the deformable portion 22. With this structural arrangement, the protruding design of the mounting member 232 and its abutment against the end of the deformable portion 22 ensure a stable connection between the elastic portion 23 and the deformable portion 22, preventing the elastic portion 23 from loosening or shifting during dynamic changes in the battery module. This structure ensures that the extension and retraction adjustment process of the strap assembly 2 can be carried out precisely and smoothly, improving the reliability and stability of the adjustment mechanism. In addition, the close contact between the mounting part 232 and the end of the deformable part 22 enhances the mechanical strength of the strap assembly 2, which is of great significance in resisting accidental impacts that the battery module may encounter during transportation or use.

[0086] It should be noted that the edge of the mounting hole 224 refers to the edge portion of the mounting hole 224, that is, the boundary of the hole or the outermost edge of the hole wall.

[0087] In one embodiment, the mounting hole 224 is configured to fit the dimensions of the elastic body 231. This matching of the mounting hole 224 to the dimensions of the elastic body 231 ensures that the elastic body 231 can be precisely installed on the deformable part 22. The dimensional fit also prevents the elastic body 231 from shifting or jamming during dynamic processes, ensuring the smoothness and reliability of the stretching adjustment of the strap assembly 2. This helps maintain the overall structural stability of the strap assembly 2 and the correct working state of the elastic body 231.

[0088] In one embodiment, a gap exists between the inner wall of the mounting hole 224 and the outer edge of the elastic body 231. This structural arrangement, maintaining a gap between the mounting hole 224 and the elastic body 231, provides the elastic body 231 with additional room to maneuver, allowing it to expand and contract more freely as the battery module size changes, reducing frictional losses and extending the service life of the elastic body 231. The gap also helps mitigate material deformation caused by changes in external factors, reducing potential damage to the strap assembly 2 and the overall structure of the battery module. Furthermore, the gap enables the elastic body 231 to absorb and cushion vibrations and shocks that the battery module may encounter during transportation or use, improving the reliability and durability of the battery device.

[0089] In one embodiment, the strap assembly 2 includes a strap body 21 and a deformable portion 22, the deformable portion 22 forming at least a part of the strap assembly 2; a mounting hole 224 is provided through the deformable portion 22 along the extending direction of the strap body 21; the elastic portion 23 includes an elastic body 231 and a mounting member 232, the mounting member 232 being connected to the end of the elastic body 231, and the elastic body 231 passing through the mounting hole 224. There are at least two elastic bodies 231 and at least two mounting holes 224, with at least two elastic bodies 231 and at least two mounting holes 224 arranged in a one-to-one correspondence. With this structural arrangement, by providing multiple elastic bodies 231 and corresponding mounting holes 224, the strap assembly 2 can more evenly distribute the mechanical stress generated when the battery cell 11 expands or contracts, avoiding the formation of stress concentration points, thereby reducing the risk of damage to the battery cell 11. The one-to-one correspondence between the elastic body 231 and the mounting hole 224 ensures that each elastic body 231 can function independently and accurately. Even if some elastic bodies 231 fail, the other elastic bodies 231 can still continue to provide the necessary extension and retraction adjustment, thereby enhancing the redundancy and fault tolerance of the strap assembly 2.

[0090] In one embodiment, the strap assembly 2 includes a strap body 21 and a deformable portion 22, the deformable portion 22 forming at least a part of the strap assembly 2; a mounting hole 224 is provided through the deformable portion 22 along the extending direction of the strap body 21; the elastic portion 23 includes an elastic body 231 and a mounting member 232, the mounting member 232 being connected to the end of the elastic body 231, the elastic body 231 being disposed within the mounting hole 224. The mounting member 232 is located at the end of the deformable portion 22 and is disposed opposite to the mounting hole 224, the outer edge of the mounting member 232 protruding from the edge of the mounting hole 224, the mounting member 232 being used to abut against the end of the deformable portion 22. There are at least two elastic bodies 231 and at least two mounting holes 224, with at least two elastic bodies 231 and at least two mounting holes 224 being provided in a one-to-one correspondence. With this structural arrangement, the deformable portion 22 allows the strap to elastically deform according to changes in the size of the battery body 1. The elastic body 231, passing through the mounting hole 224, provides the necessary stretching force when the battery contracts, ensuring the strap smoothly adapts to changes in the volume of the cell 11, reducing mechanical stress on the cell 11, thus protecting it from damage and improving the battery module's lifespan and safety. The protruding design of the mounting member 232 ensures the stable installation of the elastic body 231 at the end of the deformable portion 22, restricting lateral movement of the elastic body 231 and increasing the overall structural reliability. The arrangement of multiple elastic bodies 231 further improves the adjustability and stress dispersion performance of the strap assembly 2, allowing the strap to adaptively adjust over a wider range, adapting to a larger number of cells 11 or greater dimensional changes, enhancing the stability and adaptability of the battery module.

[0091] Specifically, the strap assembly 2 extends along the length of the battery body 1. At least a portion of the strap assembly 2 has a maximum deformation length in its extending direction that is greater than 0 mm and less than or equal to A mm; where A = 2n, and n is the number of battery cells 11. This structural arrangement, with the strap assembly 2 designed to align with the length of the battery body 1, facilitates the dense arrangement and fixation of the battery cells 11. The maximum deformation length limitation of the strap assembly 2 ensures that it can adapt to changes in the size of the battery cells 11 without being unable to adjust effectively due to insufficient deformation, thus maintaining the structural stability of the strap assembly 2 and the reliability of the battery cell fixation.

[0092] In one embodiment, the strap assembly 2 is annular and is fitted onto the battery body 1. This annular strap assembly 2 can evenly distribute pressure across the entire periphery of the battery body 1, effectively avoiding excessive local pressure, reducing the risk of damage to the battery cell 11 during the fixing process, and improving the overall stability and lifespan of the battery module.

[0093] In one embodiment, such as Figure 8 and Figure 9 As shown, the battery body 1 also includes an end plate 12, which is located at the ends of multiple battery cells 11. The end plate 12 has a mounting groove 121. One end of the strap body 21 is fixed to one side of the battery body 1, and the other end is fixed to the other side of the battery body 1. The strap assembly 2 also includes a spiral section 24, which is wound along a preset central axis. The end of the spiral section 24 away from the preset central axis is a free end 241, which is connected to the end of the strap body 21. The spiral section 24 is disposed within the mounting groove 121. With this structural arrangement, by adding the spiral section 24 to the strap assembly 2, the strap can achieve elastic adjustment through the winding and unwinding of the spiral section 24, further improving the adaptability of the strap assembly 2 to changes in the size of the battery body 1. The free end 241 of the spiral section 24 is connected to the end of the strap body 21, ensuring power transmission between the two, so that the stretching of the strap body 21 and the unwinding of the spiral section 24 can occur synchronously. By placing the scroll section 24 in the mounting groove 121 of the end plate 12, not only is space saved, but the scroll section 24 is also protected from the influence of the external environment, extending its service life. At the same time, the overall layout is more neat and orderly, which is conducive to the effective management and utilization of the internal space of the battery module.

[0094] In one embodiment, such as Figure 9 As shown, the free end 241 extends along a first preset direction X1, and the end of the strap body 21 extends along a second preset direction X2. The first preset direction X1 and the second preset direction X2 intersect each other. The strap assembly 2 also includes a torsion connector 25, one end of which is connected to the free end 241, and the other end is connected to the end of the strap body 21. The torsion connector 25 has a torsion surface 251, which is used to abut and limit the movement of the mounting groove 1211. With this structure, the torsion of the torsion connector 25 allows the spiral portion 24 to be vertically mounted in the mounting groove 121, reducing the space occupied by the spiral portion 24 in the battery device and avoiding excessive occupation of the battery device length. The abutment and limit of the torsion surface 251 of the torsion connector 25 with the edge 1211 of the mounting groove 121 ensures accurate positioning of the strap assembly 2 during the extension and retraction adjustment process and avoids structural instability caused by excessive elongation.

[0095] Specifically, the ends of the torsion connector 25, the free end 241, and the strap body 21 are welded together. This enables a high-strength mechanical connection, ensuring that all parts of the strap assembly 2 can work together as a whole when the battery module size changes, and avoiding the impact on the telescopic adjustment performance of the strap assembly 2 due to loosening of the connection during battery charging and discharging.

[0096] Specifically, as the vortex section 24 winds up, the free end 241 can move in a direction close to or away from the strap body 21, with a maximum movement distance of less than or equal to 30mm. This provides a reasonable range of expansion and contraction adjustment during the expansion and contraction of the battery module due to the charging and discharging of the cell 11. This design considers both the dimensional changes of the cell 11 under extreme operating conditions and avoids damage to the mechanical structure of the strap assembly 2 caused by excessive expansion and contraction, ensuring the long-term stability and safety of the strap assembly 2 during battery charge-discharge cycles.

[0097] Specifically, there are two spiral sections 24, which are respectively disposed at both ends of the strap body 21. There are also two strap assemblies 2, which are respectively disposed on opposite sides of the battery body 1 to form a strap group, with the two strap assemblies 2 facing each other. There are at least two strap groups, which are spaced apart along the height direction of the battery body 1. With this structural arrangement, by providing a spiral section 24 at each end of the strap body 21 and arranging strap assemblies 2 on opposite sides of the battery body 1 to form a strap group, the stretching force of the strap assemblies 2 can be more evenly distributed along the length direction of the battery body 1, reducing the non-uniform stress on the cell 11 and improving the structural integrity of the battery module and the cycle stability of the cell 11. The two strap assemblies 2, which are positioned opposite each other, can apply balanced constraint forces to the battery body 1 from opposite directions, which helps to maintain the position of the cell 11. Even during the expansion or contraction of the battery module, the position of the cell 11 can be prevented from shifting, thereby ensuring stable contact and good thermal management performance between the cells 11 inside the battery module. The strap groups spaced apart along the height direction of the battery body 1 can distribute the stress on the battery body 1 more evenly.

[0098] In one embodiment, the battery body 1 further includes a buffer heat insulation pad 13, which is disposed between two adjacent battery cells 11. This structural arrangement, with the buffer heat insulation pad 13 between the battery cells 11, effectively absorbs the minute displacements caused by the expansion or contraction of the battery cells 11 during charging and discharging, reducing mechanical stress caused by dimensional changes between the battery cells 11, thereby extending the service life of the battery cells 11. Furthermore, the buffer heat insulation pad 13 can also isolate heat conduction between the battery cells 11, preventing thermal runaway caused by overheating of a single battery cell 11 from propagating to the entire battery module, thus improving the safety of the battery module.

[0099] Specifically, the hardness of the buffer heat insulation pad 13 is greater than or equal to 30HV and less than or equal to 60HV. With this structural design, the buffer heat insulation pad 13 can have sufficient strength and durability, while providing a certain buffering effect during changes in the size of the battery module.

[0100] Specifically, the thermal conductivity of the buffer insulation pad 13 is less than or equal to 0.05 W / (m·K). In this way, the low thermal conductivity of the buffer insulation pad 13 can effectively block heat transfer between the battery cells 11, significantly reduce the rate of heat diffusion, reduce the risk of thermal runaway, and improve the safety performance of the battery device.

[0101] In one embodiment, the hardness of the buffer heat insulation pad 13 is greater than or equal to 30 HV and less than or equal to 60 HV. The thermal conductivity of the buffer heat insulation pad 13 is less than or equal to 0.05 W / (m·K). Thus, the buffer heat insulation pad 13 needs to have both buffering and heat insulation functions. The buffering performance requires the material to have good elastic strain capacity. Traditional buffer heat insulation pads 13 are generally made of soft materials such as foam, which have poor heat insulation performance. The heat insulation performance requires the material to have low thermal conductivity. However, low thermal conductivity materials are generally hard, but their elastic strain capacity is poor. Traditional buffer heat insulation pads 13 mostly use a combination of soft materials with high elastic strain and hard materials with low thermal conductivity, which is relatively complex and costly. However, the battery module with strap assembly 2 provided in this embodiment uses a high-hardness, low-thermal-conductivity material between the cells 11 to achieve the heat insulation performance of the battery module, and the buffering performance is achieved by the strap assembly 2, which can effectively reduce costs.

[0102] An embodiment of the present invention provides an energy storage system, which includes the battery device described above.

[0103] The energy storage system provided by one embodiment of the present invention allows the deformable portion of the strap assembly 2 to naturally deform with the expansion and contraction of the battery body 1 during charging and discharging. This effectively absorbs the stress generated during the expansion of the battery cell 11, avoiding excessive mechanical pressure on the battery cell 11 and thus extending the service life of the battery cell 11 and even the entire battery device. Traditional strap assemblies 2 typically only passively adapt to the increase in size of the battery body 1 when it expands. However, when the battery discharges or cools, the retracted battery body 1 is not effectively supported, and the strap assembly 2 often cannot actively retract, leading to an increase in the gaps between the battery cells 11, affecting the overall structural stability and energy density of the module. The introduced elastic portion 23 has bidirectional adjustment capability. Not only can it extend with the expansion of the battery body 1, but more importantly, when the battery body 1 retracts, the elastic portion 23 can actively restore its original shape, causing at least a portion of the strap assembly 2 to retract accordingly, tightly fixing the battery cell 11 again, thereby maintaining the consistency and high efficiency of the battery module. At least a portion of the strap assembly 2 works in conjunction with the elastic portion 23 to ensure that the dynamic dimensional changes of the cell 11 during charging and discharging are smoothly absorbed and released. This mechanism avoids the cell 11 being squeezed under extreme expansion and also prevents gaps caused by the stiffness of the strap assembly 2 when the cell 11 retracts, effectively extending the cycle life of the battery body 1, reducing the failure rate, and improving the reliability of the battery device. Therefore, the energy storage system provided in this embodiment can solve the problem in the prior art where the strap of the battery module cannot adjust its length according to the expansion and contraction of the cell.

[0104] An embodiment of the present invention provides an electrical device, which includes the battery device described above.

[0105] The electrical device provided by an embodiment of the present invention allows the deformable portion of the strap assembly 2 to naturally deform with the expansion and contraction of the battery body 1 during charging and discharging. This effectively absorbs the stress generated during the expansion of the battery cell 11, avoiding excessive mechanical pressure on the battery cell 11 and thus extending the service life of the battery cell 11 and even the entire battery device. Traditional strap assemblies 2 typically only passively adapt to the increase in size of the battery body 1 when it expands. However, when the battery discharges or cools, the retracted battery body 1 is not effectively supported, and the strap assembly 2 often cannot actively retract, leading to an increase in the gaps between the battery cells 11, affecting the overall structural stability and energy density of the module. The introduced elastic portion 23 has bidirectional adjustment capability. Not only can it extend with the expansion of the battery body 1, but more importantly, when the battery body 1 retracts, the elastic portion 23 can actively restore its original shape, causing at least a portion of the strap assembly 2 to retract accordingly, re-tightly fixing the battery cell 11, thereby maintaining the consistency and high efficiency of the battery module. At least a portion of the strap assembly 2 works in conjunction with the elastic portion 23 to ensure that the dynamic dimensional changes of the cell 11 during charging and discharging are smoothly absorbed and released. This mechanism avoids the cell 11 being squeezed under extreme expansion and also prevents gaps caused by the stiffness of the strap assembly 2 when the cell 11 retracts, effectively extending the cycle life of the battery body 1, reducing the failure rate, and improving the reliability of the battery device. Therefore, the electrical device provided in this embodiment can solve the problem in the prior art where the strap of the battery module cannot adjust its length according to the expansion and contraction of the cell.

[0106] Those skilled in the art will understand that the above embodiments are specific examples of implementing this application, and in practical applications, various changes in form and detail can be made without departing from the spirit and scope of this application. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this application; therefore, the scope of protection of this application should be determined by the scope defined in the claims.

Claims

1. A battery device, characterized in that, include: The battery body (1) includes multiple cells (11) arranged in parallel. A strap assembly (2) is connected to the battery body (1) to fix a plurality of battery cells (11); the strap assembly (2) includes a strap body (21) and a deformable portion (22) disposed on the strap body (21). The deformable portion (22) is deformably disposed along the extension direction of the strap assembly (2) to extend as the battery body (1) expands. Both ends of the deformable portion (22) are hinged to the strap body (21). An elastic part (23) extends along the extension direction of the strap assembly (2) and is disposed on the strap assembly (2). One end of the elastic part (23) is connected to one end of the deformable part (22), and the other end of the elastic part (23) is connected to the other end of the deformable part (22). It can extend as the battery body (1) expands and recover as the battery body (1) retracts, and drive the deformable part (22) to recover. The elastic part (23) is located on one side of the deformable part (22). The deformable part (22) includes at least two deformable connectors (220) and a plurality of folding structures. The at least two deformable connectors (220) are connected sequentially along the extension direction of the strap body (21). One of the two adjacent deformable connectors (220) is movably arranged relative to the other to adjust the overall length of the at least two deformable connectors (220) along the extension direction of the strap body (21). The two adjacent deformable connectors (220) are hinged to each other. The deformable connectors (220) intersect with the strap body (21) to adjust the overall length of the at least two deformable connectors (220) along the extension direction of the strap body (21). The folding structures are foldably arranged along the extension direction of the strap assembly (2). When the battery body (1) expands, the folding structures unfold and extend. When the battery body (1) retracts, the folding structures fold. The elastic part (23) includes an elastic body (231) and two mounting members (232). The elastic body (231) extends along the extension direction of the strap assembly (2). One end of the elastic body (231) and the other end are respectively connected to the two mounting members (232). Both mounting members (232) are fixed on the strap assembly (2). Each of the folding structures is provided with a mounting hole (224) extending along the extension direction of the strap body (21); the elastic part (23) includes an elastic body (231) and a mounting member (232), the mounting member (232) is connected to the end of the elastic body (231), and the elastic body (231) passes through the mounting hole (224).

2. The battery device according to claim 1, characterized in that, The deformable portion (22) includes a folded structure; wherein: The folding structure includes a first folding piece (221), a second folding piece (222), and a third folding piece (223) connected sequentially along the extension direction of the strap assembly (2). The first folding piece (221) and the second folding piece (222) are arranged opposite to each other, and the second folding piece (222) and the third folding piece (223) are arranged opposite to each other. And / or, The folding structure is an S-shaped structure; and / or, The folding structure is multiple, and the multiple folding structures are connected sequentially along the extension direction of the strap assembly (2).

3. The battery device according to claim 1, characterized in that, There are multiple deformable parts (22) and multiple elastic parts (23). Multiple deformable parts (22) are spaced apart on the strap body (21). Multiple deformable parts (22) and multiple elastic parts (23) are arranged in a one-to-one correspondence.

4. The battery device according to claim 1, characterized in that, The mounting member (232) is located at the end of the deformable portion (22) and is disposed opposite to the mounting hole (224). The outer edge of the mounting member (232) protrudes from the edge of the mounting hole (224). The mounting member (232) is used to abut against the end of the deformable portion (22); and / or, There are at least two elastic bodies (231) and at least two mounting holes (224), and at least two elastic bodies (231) and at least two mounting holes (224) are provided in a one-to-one correspondence.

5. The battery device according to any one of claims 1 to 4, characterized in that, The strap assembly (2) extends along the length direction of the battery body (1); Wherein, the maximum deformation length of the deformable part (22) in the extension direction of the strap assembly (2) is greater than 0 mm and less than or equal to A mm; where A = 2n, and n is the number of the battery cells (11).

6. The battery device according to claim 1, characterized in that, The battery body (1) also includes an end plate (12), which is located at the end of the plurality of cells (11), and the end plate (12) is provided with a mounting groove (121); one end of the strap body (21) is fixed to one side of the battery body (1), and the other end of the strap body (21) is fixed to the other side of the battery body (1); The strap assembly (2) further includes: The spiral section (24) is wound around a preset central axis. The end of the spiral section (24) away from the preset central axis is a free end (241), which is connected to the end of the strap body (21). The spiral section (24) is disposed in the mounting groove (121).

7. The battery device according to claim 6, characterized in that, The free end (241) extends along a first preset direction (X1), and the end of the strap body (21) extends along a second preset direction (X2), wherein the first preset direction (X1) and the second preset direction (X2) intersect each other; the strap assembly (2) further includes: A torsion connector (25) is provided, one end of which is connected to the free end (241) and the other end of which is connected to the end of the strap body (21). The torsion connector (25) has a torsion surface (251) which is used to abut against and limit the groove edge (1211) of the mounting groove (121).

8. The battery device according to claim 1, characterized in that, The battery body (1) further includes a buffer heat insulation pad (13), which is disposed between two adjacent battery cells (11); wherein: The hardness of the buffer insulation pad (13) is greater than or equal to 30 HV and less than or equal to 60 HV; and / or, The thermal conductivity of the buffer insulation pad (13) is less than or equal to 0.05 W / (m·K).

9. An energy storage system, characterized in that, include: The battery device according to any one of claims 1 to 8.

10. An electrical appliance, characterized in that, include: The battery device according to any one of claims 1 to 8.

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