Battery device, energy storage system and electric equipment

Abstract

The embodiment of the invention relates to the field of battery devices, and provides a battery device, an energy storage system and electric equipment. The battery device comprises: a battery main body comprising a plurality of battery cells arranged in parallel; the bridle assembly is connected with the battery main body so as to fix the plurality of battery cells; at least part of the strap assembly is arranged in a deformable manner along the extension direction of the strap assembly so as to extend along with the expansion of the battery main body; and the elastic part is arranged on the bridle assembly in an extending manner along the extending direction of the bridle assembly, so as to extend along with the expansion of the battery main body, recover along with the retraction of the battery main body, and drive at least part of the bridle assembly to recover. The battery device provided by the embodiment of the invention at least can improve the adaptability of the bridle in the expansion and contraction process of the battery cell.

Description

Technical Field

[0001] The present application relates to the technical field of battery devices, and particularly relates to a battery device, an energy storage system, and an electrical equipment. Background Art

[0002] Currently, a battery module usually includes a plurality of series-connected or parallel-connected battery cells. These battery cells will experience different degrees of expansion and contraction during the charging and discharging processes, especially in the stage of large-capacity batteries and when the designed capacity of the battery reaches 60% to 70% of the End of Life (EOL). The expansion phenomenon of the battery cells is particularly significant. In order to maintain the stability of the module structure and enhance the thermal management performance, the battery module usually uses a strap to fix the battery cells.

[0003] However, the length of the traditional strap is fixed in the length direction of the battery module and does not have a length adjustment function, so it cannot effectively adapt to the expansion and contraction changes of the battery cells, which may cause the battery cells to be over-pressed or loose, seriously affecting the cycle life and safety of the battery module. Summary of the Invention

[0004] The embodiments of the present application provide a battery device, an energy storage system, and an electrical equipment, which are at least beneficial to improving the adaptability of the strap during the expansion and contraction of the battery cells.

[0005] According to some embodiments of the present application, on the one hand, an embodiment of the present application provides a battery device, including:

[0006] A battery main body, including a plurality of juxtaposed battery cells;

[0007] A strap assembly, connected to the battery main body to fix the plurality of battery cells; at least part of the strap assembly is deformably arranged along the extension direction of the strap assembly to elongate as the battery main body expands;

[0008] An elastic part, extending along the extension direction of the strap assembly and arranged on the strap assembly to elongate as the battery main body expands, recover as the battery main body retracts, and drive at least part of the strap assembly to recover.

[0009] In some embodiments, the strap assembly includes a strap main body and a deformation part, the deformation part is arranged on the strap main body, and the deformation part forms at least part of the strap assembly;

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

[0011] In some embodiments, the deformation part includes at least two deformation connectors, the at least two deformation connectors are sequentially connected along the extension direction of the strap main body, and one of the adjacent two deformation connectors is movably arranged relative to the other to adjust the overall length of the at least two deformation connectors along the extension direction of the strap main body.

[0012] In some embodiments, both ends of the deformable portion are hinged to the belt body, and two adjacent deformable connectors are hinged to each other; or,

[0013] Two adjacent deformable connectors are both tubular structures, and one of the two adjacent deformable connectors is sleeved on the other and is movably arranged along the extending direction of the belt body.

[0014] In some embodiments, at least part of the belt assembly includes a folding structure; wherein:

[0015] The folding structure includes a first folding piece, a second folding piece and a third folding piece that are sequentially connected along the extending direction of the belt assembly. The first folding piece and the second folding piece are arranged oppositely, and the second folding piece and the third folding piece are arranged oppositely; and / or,

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

[0017] There are multiple folding structures, and the multiple folding structures are sequentially connected along the extending direction of the belt assembly.

[0018] In some embodiments, there are multiple deformable portions and multiple elastic portions. The multiple deformable portions are arranged at intervals on the belt body, and the multiple deformable portions and the multiple elastic portions are arranged in one-to-one correspondence.

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

[0020] In some embodiments, the belt assembly includes a belt body and a deformable portion, and the deformable portion forms at least part of the belt assembly; a mounting hole is formed through the deformable portion along the extending direction of the belt body; the elastic portion includes an elastic main body and a mounting member, and the mounting member is connected to the end of the elastic main body, and the elastic main body is inserted into the mounting hole; wherein:

[0021] The mounting member is located at the end of the deformable portion and is arranged opposite to the mounting hole. The outer edge of the mounting member protrudes from the hole edge of the mounting hole, and the mounting member is used for abutting against the end of the deformable portion; and / or,

[0022] There are at least two elastic main bodies and at least two mounting holes, and the at least two elastic main bodies and the at least two mounting holes are arranged in one-to-one correspondence.

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

[0024] Wherein, the maximum deformation length of at least a part of the belt assembly in the extending direction of the belt assembly is greater than 0 mm and less than or equal to A mm; wherein, A = 2n, and n is the number of battery cells.

[0025] In some embodiments, the battery body further includes end plates located at the ends of the plurality of battery cells, and mounting grooves are provided on the end plates; one end of the belt body is fixed to one side of the battery body, and the other end of the belt body is fixed to the other side of the battery body; the belt assembly further includes:

[0026] A scroll part, which is wound along a preset central axis. The end of the scroll part away from the preset central axis is a free end, and the free end is connected to the end of the belt body; the scroll part is arranged in the mounting groove.

[0027] In some embodiments, the free end extends along a first preset direction, and the end of the belt body extends along a second preset direction. The first preset direction intersects with the second preset direction; the belt assembly further includes:

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

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

[0030] The hardness of the buffer 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 heat insulation pad is less than or equal to 0.05 W / (m·K).

[0032] According to some embodiments of the present application, on the other hand, an energy storage system is provided, including the battery device provided above.

[0033] According to some embodiments of the present application, on the other hand, an electrical equipment is provided, including the battery device provided above.

[0034] The technical solutions provided by the embodiments of the present application have at least the following advantages:

[0035] The deformable part of the belt assembly can deform naturally as the battery body expands and contracts during charge and discharge processes. This effectively absorbs the stress generated during the expansion of the battery cells, avoiding the direct action of excessive mechanical pressure on the battery cells, thereby extending the service life of the battery cells and even the entire battery device. Traditional belt assemblies can usually only passively adapt to the increase in the battery body when it expands. However, when the battery discharges or cools down, the retracting battery body fails to be effectively supported, and the belt assembly often cannot actively retract, resulting in an increase in the gap between the battery cells and affecting the overall structural stability and energy density of the module. The introduced elastic part has a two-way adjustment ability. It can not only stretch along with the expansion of the battery body, but more importantly, when the battery body retracts, the elastic part can actively return to its original state, driving at least part of the belt assembly to retract accordingly, tightly fixing the battery cells again, thereby maintaining the consistency and high performance of the battery module. At least part of the belt assembly works in cooperation with the elastic part to ensure that the dynamic dimensional changes of the battery cells during charge and discharge processes are smoothly absorbed and released. This mechanism avoids the extrusion of the battery cells in the extreme expansion state and also prevents the generation of gaps due to the stiffness of the belt assembly when the battery cells retract, effectively extending the cycle life of the battery body, reducing the failure rate, and improving the reliability of the battery device. Therefore, through the technical solution provided by the embodiments of the present application, the problem that the belt of the battery module in the prior art cannot adjust its length with the expansion and contraction of the battery cells can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] One or more embodiments are exemplarily illustrated by the figures in the corresponding drawings. These exemplary illustrations do not limit the embodiments unless otherwise stated. The figures in the drawings do not constitute a proportional limitation; in order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following-described drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0037] Figure 1 Structural schematic diagram of a battery device provided by an embodiment of the present application;

[0038] Figure 2 Partial structural schematic diagram of a belt assembly of a battery device provided by an embodiment of the present application;

[0039] Figure 3 Structural schematic diagram of a deformation part of a battery device provided by an embodiment of the present application;

[0040] Figure 4 Structural schematic diagram of an elastic part of a battery device provided by an embodiment of the present application;

[0041] Figure 5 Schematic diagram of the structure of the strap assembly of the battery device provided by an embodiment of the present application in the initial state;

[0042] Figure 6 Schematic diagram of the structure of the strap assembly of the battery device provided by an embodiment of the present application in the stretched state;

[0043] Figure 7 Partial schematic diagram of the structure of the strap assembly of the battery device provided by an embodiment of the present application in the initial state;

[0044] Figure 8 Partial schematic diagram of the structure of the battery device provided by an embodiment of the present application;

[0045] Figure 9 Schematic diagram of the structure of the scroll part of the battery device provided by an embodiment of the present application.

[0046] Among them, the above-mentioned drawings include the following reference numerals:

[0047] 1. Battery main body; 11. Battery cell; 12. End plate; 121. Mounting groove; 1211. Edge of the notch; 13. Buffer heat insulation pad; 14. Upper cover plate; 15. Integrated bus bar; 2. Strap assembly; 21. Strap main body; 22. Deformation part; 220. Deformation connecting piece; 221. First folding piece; 222. Second folding piece; 223. Third folding piece; 224. Mounting hole; 225. Rivet; 23. Elastic part; 231. Elastic main body; 232. Mounting piece; 24. Scroll part; 241. Free end; 25. Torsion connecting piece; 251. Torsion surface; X1. First preset direction; X2. Second preset direction. Detailed implementation manners

[0048] As can be seen from the background art, the strap of the battery module in the prior art cannot adjust its length with the expansion and contraction of the battery cell.

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

[0050] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means more than two, unless otherwise clearly and specifically defined.

[0051] Reference to "embodiments" in this application means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment each time, nor are they independent or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0052] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: the existence of A, the simultaneous existence of A and B, and the existence of B. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0053] In the description of the embodiments of this application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0054] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this application.

[0055] In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0056] In the accompanying drawings corresponding to the embodiments of the present application, for better understanding and description, the thickness and area of the layers are enlarged. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component can be "directly" on the surface of the other component, or there can 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 provided on the surface of a component, it means that there is no third component between the two components. In addition, when describing a component as being "substantially" 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 partial edge of the entire surface.

[0057] In the description of the embodiments of the present application, when a component "includes" another component, unless otherwise specified, other components are not excluded, and other components may further be included. In addition, when components such as layers, films, regions, or plates are referred to as being "on / lying on" another component, it can be "directly on" the other component (i.e., on the surface of the other component with no other components between them), or there can be another component between them. In addition, when components such as layers, films, regions, plates, etc. are "directly located on" another component, or when components such as layers, films, regions, plates, etc. are located on the surface of another component, it means that no other components are located between them.

[0058] The terms used in the description of the various embodiments herein are only for describing specific embodiments and are not intended to be limiting. As used in the description of the various embodiments and the appended claims, "the part" is also intended to include the plural form unless the context clearly indicates otherwise. Among them, components include components such as layers, films, regions, or plates.

[0059] The embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present application, many technical details are provided to help readers better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented.

[0060] As Figures 1 to 9As shown in the figure, an embodiment of the present invention provides a battery device, which includes a battery main body 1, a strap assembly 2, and an elastic part 23. The battery main body 1 includes a plurality of parallel battery cells 11. The strap assembly 2 is connected to the battery main body 1 to fix the plurality of battery cells 11; at least a part of the strap assembly 2 is deformably arranged along the extension direction of the strap assembly 2 so as to elongate as the battery main body 1 expands. The elastic part 23 extends along the extension direction of the strap assembly 2 and is arranged on the strap assembly 2 so as to elongate as the battery main body 1 expands, recover as the battery main body 1 retracts, and drive at least a part of the strap assembly 2 to recover.

[0061] With the battery device provided by an embodiment of the present invention, the deformable part of the strap assembly 2 can deform naturally as the battery main body 1 expands and contracts during the charge and discharge process, which effectively absorbs the stress generated during the expansion of the battery cells 11, avoids the direct action of excessive mechanical pressure on the battery cells 11, and thus extends the service life of the battery cells 11 and even the entire battery device. The traditional strap assembly 2 can usually only passively adapt to the increase of the battery main body 1 when it expands. However, when the battery discharges or cools down, the retracted battery main body 1 fails to be effectively supported, and the strap assembly 2 often cannot retract actively, resulting in an increase in the gap between the battery cells 11 and affecting the overall structural stability and energy density of the module. The introduced elastic part 23 has a two-way adjustment ability. It can not only extend following the expansion of the battery main body 1, but more importantly, when the battery main body 1 retracts, the elastic part 23 can actively return to its original state and drive at least a part of the strap assembly 2 to retract accordingly, re-tightly fixing the battery cells 11, thereby maintaining the consistency and high efficiency of the battery module. At least a part of the strap assembly 2 and the elastic part 23 work together to ensure that the dynamic dimensional changes of the battery cells 11 during the charge and discharge process are smoothly absorbed and released. This mechanism avoids the extrusion of the battery cells 11 in the extreme expansion state and also prevents the generation of gaps due to the stiffness of the strap assembly 2 when the battery cells 11 retract, effectively extending the cycle life of the battery main body 1, reducing the failure rate, and improving the reliability of the battery device. Therefore, through the battery device provided by this embodiment, the problem that the strap of the battery module in the prior art cannot adjust its length with the expansion and contraction of the battery cells can be solved.

[0062] Specifically, as Figure 1As shown, the battery body 1 is a battery module. Each battery cell 11 of the battery module is arranged in parallel in sequence, and the position of each battery cell 11 is fixed by a banding component 2. The battery body 1 further includes an integrated busbar 15 and an upper cover plate 14. Each battery cell 11 is connected to the integrated busbar 15. The upper cover plate 14 is covered on the integrated busbar 15 and covers multiple battery cells 11. This ensures the stable arrangement and fixation of the battery cells 11 inside the battery module, avoids the damage caused by the movement of the battery cells 11 due to vibration or transportation in the battery module, and enhances the overall structural stability and reliability of the battery module. At the same time, the orderly parallel layout of the battery cells 11 is beneficial to optimizing the space utilization rate and increasing the energy density of the battery, which is crucial for improving the performance of the battery energy storage system.

[0063] Specifically, the banding component 2 is a metal strip structure. With such a structural setting, the metal strip has good mechanical strength and physical stability, can withstand the pressure brought by the expansion of the battery cell 11, and at the same time can adapt to the volume change of the battery cell 11 through appropriate deformation when necessary, ensuring the structural integrity of the battery module under different working conditions. The high thermal conductivity of the metal material also helps to improve the heat dissipation performance of the battery module, thereby further enhancing the service life and safety of the battery.

[0064] Specifically, the banding component 2 is a steel strip structure. In this way, the high hardness and toughness of the steel strip enable it to deform and elongate when subjected to the expansion pressure of the battery cell 11, and retract to its original position by the action of the elastic part 23 during the discharge process, perfectly matching the dynamic size change of the battery module.

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

[0066] Specifically, the deformation part 22 includes at least two deformation connectors 220. The at least two deformation connectors 220 are sequentially connected along the extension direction of the belt body 21. One of the adjacent two deformation connectors 220 is arranged to be movable relative to the other to adjust the overall length of the at least two deformation connectors 220 along the extension direction of the belt body 21. With such a structural arrangement, when the battery cell 11 expands, the belt assembly 2 gradually elongates through the relative movement between the deformation connectors 220, ensuring that the expansion change of the battery cell 11 is smoothly absorbed step by step and avoiding sudden stress concentration. Similarly, when the size of the battery cell 11 returns, the deformation connectors 220 can quickly adjust their relative position relationship, causing the belt assembly 2 to retract to an appropriate length and tightly bind the battery cell 11 again. The multiple deformation connectors 220 can provide delicate deformation adjustment, reduce improper compression on the battery cell 11, and at the same time enhance the tensile strength and overall elasticity of the belt assembly 2, further improving the performance and reliability of the battery device in the face of various working condition challenges.

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

[0068] Specifically, as Figure 7 shown, both ends of the deformation part 22 are hinged to the belt body 21 through rivets 225, and two adjacent deformation connectors 220 are hinged to each other through rivets 225. When the belt assembly 2 is in the initial state, two adjacent deformation connectors 220 cross each other. The deformation connectors 220 and the belt body 21 cross each other; when the belt assembly 2 is in the stretched state, both the deformation connectors 220 and the belt body 21 extend in the same direction. In this way, the hinged structure connected by the rivets 225 ensures the stability and reliability of the deformation connectors 220 during the movement process, avoiding wear or failure at the connection due to the change in the size of the battery module.

[0069] In one embodiment, two adjacent deformation connectors 220 are both tubular structures, and one of the two adjacent deformation connectors 220 is sleeved on the other and is movably arranged along the extending direction of the belt body 21. With such a structural arrangement, through the movability of one deformation connector 220 on the other, the adaptability of the belt assembly 2 is improved. When the battery body 1 increases due to the expansion of the battery cell 11, the deformation connectors 220 in the sleeve structure can extend the length of the belt assembly 2 through relative sliding. This process is smooth and does not require an additional driving mechanism, relying entirely on the thrust generated when the battery cell 11 expands. Conversely, during the discharging process, the excess length can be eliminated by the back-movement of the sleeve, restoring the original size of the battery module. The sleeve-type deformation part 22 design not only simplifies the structure, reduces the manufacturing cost, but also improves the flexibility and response speed of the belt assembly 2, ensuring the 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 disposed foldably along the extending direction of the strap assembly 2. With such a structural arrangement, when the battery body 1 expands, the folding structure can unfold and extend, providing necessary space for the expansion of the battery cells 11 and avoiding extrusion between the battery cells 11. When the battery cells 11 retract, the folded portion can naturally fold, rapidly reducing the length of the strap assembly 2, ensuring that the battery cells 11 are closely arranged, reducing the gaps between the battery 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 that are sequentially connected along the extending direction of the strap assembly 2. The first folding piece 221 and the second folding piece 222 are disposed opposite to each other, and the second folding piece 222 and the third folding piece 223 are disposed opposite to each other. With such a structural arrangement, this connection manner of the folding pieces forms a structure similar to a "Z" shape. When the expansion of the battery cells 11 causes an increase in the length of the battery body 1, the Z-shaped folding structure can achieve the extension of 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 generating additional compressive force on the battery cells 11. On the contrary, when the battery cells 11 retract, the folding pieces can quickly recover and tighten the strap assembly 2 to ensure that the battery cells 11 are closely arranged.

[0072] Specifically, as Figure 2 and Figure 3 shown, the folding structure is an S-shaped structure. In this way, compared with a straight-line or simple bending structure, the S-shaped structure has better stress dispersion ability and a larger deformation range. The strap assembly 2 with an S-shaped structure can stretch more naturally when the battery cells 11 expand, with a gentle deformation path, avoiding stress concentration and material damage that may be caused by sharp turning points. At the same time, the S-shaped structure has stronger recoverability. When the size of the battery cells 11 retracts, the S-shaped structure can fold and recover more smoothly, reducing residual stress and ensuring the long-term service performance of the strap assembly 2.

[0073] Specifically, there are multiple folding structures, and the multiple folding structures are sequentially connected along the extending direction of the strap assembly 2. In this way, the adaptability and adjustment range of the strap are enhanced. In the case where the size of the battery body 1 changes greatly, a single folding structure may not be able to meet the required stretching or folding amplitude, while the combination of multiple folding structures can provide a larger telescopic space to ensure that the strap assembly 2 can always match the dynamic size of the battery body 1. In addition, the design of multiple folding structures can more evenly distribute the stress generated when the battery cells 11 expand or retract, 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 belt 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 that are sequentially connected along the extension direction of the belt assembly 2. The first folding piece 221 and the second folding piece 222 are disposed opposite to each other, and the second folding piece 222 and the third folding piece 223 are disposed opposite to each other. The folding structure is an S-shaped structure. In this way, the S-shaped folding structure design improves the scalability and stress dispersion ability of the belt 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 achieve dynamic adjustment of the length of the belt assembly 2 through the relative rotation between the first folding piece 221, the second folding piece 222, and the third folding piece 223, effectively avoiding excessive extrusion or separation between the battery cells 11, protecting the battery cells 11 from mechanical stress damage, and thus extending the service life of the battery module. The characteristics of the S-shaped structure also lie in its ability to smoothly stretch and fold, reducing local stress concentration and improving the reliability and durability of the belt assembly 2 during repeated use.

[0075] In one embodiment, at least a portion of the belt 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 that are sequentially connected along the extension direction of the belt assembly 2. The first folding piece 221 and the second folding piece 222 are disposed opposite to each other, and the second folding piece 222 and the third folding piece 223 are disposed opposite to each other. There are multiple folding structures, and the multiple folding structures are sequentially connected along the extension direction of the belt assembly 2. With such a structural arrangement, the design of multiple folding structures enables the belt assembly 2 to stretch through finer levels when the battery body 1 expands, avoiding irreversible damage to the material caused by excessive deformation. At the same time, the multi-layer folding structure can quickly recover when the battery cells 11 contract, ensuring the structural stability of the battery module and the close contact between the battery cells 11.

[0076] In one embodiment, at least a portion of the belt assembly 2 includes a folding structure. The folding structure is an S-shaped structure. There are multiple S-shaped structures, and the multiple S-shaped structures are sequentially connected along the extension direction of the belt assembly 2. In this way, the series use of multiple S-shaped folding structures enables the belt assembly 2 to smoothly stretch through multiple S-shaped turning points when the battery body 1 expands, effectively dispersing the pressure and reducing the stress concentration at a single folding point, thereby protecting the structure of the battery cells 11 from damage. When the size of the battery cells 11 shrinks back, the multi-layer S-shaped folding structure can quickly recover, maintaining the tightness of the belt assembly 2 and ensuring the best contact between the battery cells 11, which is beneficial to improving the heat conduction efficiency and energy output consistency of the battery module. In addition, the multi-layer design of the S-shaped structure also increases the elasticity of the belt assembly 2, enabling it to better buffer and absorb stress in the face of external impacts or vibrations, enhancing the mechanical stability and durability of the battery module.

[0077] In one embodiment, at least a portion of the belt 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 that are sequentially connected along the extending direction of the belt assembly 2. The first folding piece 221 and the second folding piece 222 are oppositely arranged, and the second folding piece 222 and the third folding piece 223 are oppositely arranged. The folding structure is an S-shaped structure. There are multiple S-shaped structures, and the multiple S-shaped structures are sequentially connected along the extending direction of the belt assembly 2. In this way, the belt assembly 2 adopts multiple S-shaped structures as deformation structures. The multi-layer arrangement of the S-shaped folding structure can provide a greater stretching range, enabling the belt assembly 2 to more flexibly adjust its length when the battery cell 11 expands, avoiding hard collisions or squeezes between the battery cells 11, reducing the stress inside the battery cell 11, and having a significant positive impact on the capacity retention and cycle life of the battery. At the same time, the design of multiple S-shaped structures ensures the rapid reset of the belt assembly 2 during the retraction process of the battery cell 11, maintains the compactness of the battery module and the good contact between the battery cells 11, and optimizes the thermal management and electrical connection performance of the battery. Through multi-point stress dispersion, this design also reduces the impact of external shocks on the overall structure of the belt assembly 2 and the battery module, improving the seismic resistance and safety of the battery device.

[0078] In one embodiment, there are multiple deformation portions 22 and multiple elastic portions 23. The multiple deformation portions 22 are spaced apart on the belt main body 21, and the multiple deformation portions 22 and the multiple elastic portions 23 are arranged in one-to-one correspondence. With such a structural arrangement, the distribution of the multiple deformation portions 22 can more comprehensively cover the battery main body 1, ensuring that any expansion or contraction of the battery cell 11 at any position can be promptly responded to, thereby reducing local stress concentration and protecting the battery cell 11 from damage. The corresponding multiple elastic portions 23 play a key regulating and buffering role. They can provide elastic restoring forces for the corresponding deformation portions 22, enabling the belt assembly 2 to quickly reset to its original state and maintaining the close contact between the battery cells 11. In addition, this one-to-one design also ensures the uniformity of stress dispersion, preventing problems such as extrusion or loosening of the battery cells 11 that may be caused by uneven distribution of elastic forces, and playing an important role in improving the overall performance and extending the life of the battery module.

[0079] In one embodiment, as Figures 5 to 7As shown in the figure, the elastic part 23 is located on one side of at least part of the belt assembly 2; the elastic part 23 includes an elastic main body 231 and two mounting parts 232. The elastic main body 231 extends along the extending direction of the belt assembly 2. One end and the other end of the elastic main body 231 are respectively connected to the two mounting parts 232, and both of the two mounting parts 232 are fixed on the belt assembly 2. With such a structural arrangement, the elastic part 23 is arranged on one side of the belt assembly 2. Through the combination of the elastic main body 231 and the two mounting parts 232, the high efficiency and stability of the telescopic adjustment of the belt assembly 2 are achieved. The elastic main body 231 is arranged along the extending direction of the belt assembly 2, ensuring that it can be elongated accordingly when the battery cell 11 expands, and when the battery cell 11 contracts, it can provide a restoring force along the extending direction of the belt assembly 2 for the deformation part 22 to restore the length of the deformation part 22. The fixed connection between the mounting part 232 and the belt assembly 2 not only simplifies the installation process of the elastic part 23, improves the assembly efficiency, but also provides a firm fulcrum, enabling the elastic main body 231 to play its elastic adjustment role more effectively. This side-mounted elastic part 23 design can reasonably utilize the space under the condition of limited internal space of the battery module, improving the overall design compactness of the battery device.

[0080] In one embodiment, the elastic main body 231 is a spring structure. In this way, the design of the spring structure allows the belt assembly 2 to elongate and deform when the battery cell 11 expands, and when the size of the battery cell 11 shrinks or returns to its original state, the spring can quickly release the stored energy, prompting the belt to return to its original length and maintaining the close contact between the battery cells 11.

[0081] In one embodiment, the elastic main body 231 is a corrugated pipe structure. In this way, the corrugated pipe structure can smoothly stretch and contract along with the expansion and contraction of the battery cell 11. This dynamic adjustment not only avoids direct mechanical compression of the battery cell 11, but also ensures the proper fixation of the battery cell 11 in different charge and discharge states, reducing the friction and wear between the battery cells 11, and contributing to maintaining the structural integrity of the battery module and the electrical performance of the battery cells.

[0082] In one embodiment, the elastic main body 231 is made of rubber or elastic polymer. In this way, rubber or elastic polymer usually has excellent anti-fatigue performance and high elastic recovery rate. Even under the pressure cycle of the expansion and contraction of the battery cell 11 for a long time, it can maintain a stable elastic state, effectively avoiding the performance degradation of the battery cell 11 caused by excessive extrusion or relaxation. In addition, these materials are relatively lightweight, reducing the total weight of the belt assembly 2 and improving the portability of the battery device.

[0083] Specifically, the mounting part 232 is welded to the belt assembly 2. In this way, a firm combination of the two can be achieved, ensuring the structural integrity and functional reliability of the belt assembly 2 when the size of the battery module changes.

[0084] In one embodiment, as Figures 2 to 4 shown, the strap assembly 2 includes a strap body 21 and a deformation part 22, and the deformation part 22 forms at least part of the strap assembly 2; an installation hole 224 is penetrated along the extension direction of the strap body 21 on the deformation part 22; the elastic part 23 includes an elastic main body 231 and an installation part 232, the installation part 232 is connected to the end of the elastic main body 231, and the elastic main body 231 is penetrated in the installation hole 224. With such a structural arrangement, a through installation hole 224 is provided in the deformation part 22, and the elastic main body 231 is penetrated therein, forming a dynamic adjustment mechanism. This design allows the strap to automatically adjust its length through the deformation of the deformation part 22 and the expansion and contraction of the elastic part 23 when the size of the battery module changes. The presence of the installation hole 224 not only ensures the correct positioning of the elastic part 23 but also allows it to move freely within a certain range to adapt to the expansion and contraction of the battery module. The connection mode between the elastic main body 231 and the installation part 232 provides a stable fulcrum, ensuring the responsiveness and stability of the elastic part 23 during the deformation process. This design significantly improves the adaptability of the strap assembly 2 to the change of battery size, reduces the mechanical stress between the battery cells 11, and thus improves the working efficiency and overall life of the battery module.

[0085] In one embodiment, the strap assembly 2 includes a strap body 21 and a deformation part 22, and the deformation part 22 forms at least part of the strap assembly 2; an installation hole 224 is penetrated along the extension direction of the strap body 21 on the deformation part 22; the elastic part 23 includes an elastic main body 231 and an installation part 232, the installation part 232 is connected to the end of the elastic main body 231, and the elastic main body 231 is penetrated in the installation hole 224. The installation part 232 is located at the end of the deformation part 22 and is arranged opposite to the installation hole 224, the outer edge of the installation part 232 protrudes from the hole edge of the installation hole 224, and the installation part 232 is used to abut against the end of the deformation part 22. With such a structural arrangement, the protruding design of the installation part 232 and its abutment against the end of the deformation part 22 ensure the firm connection between the elastic part 23 and the deformation part 22, avoiding the loosening or displacement of the elastic part 23 during the dynamic change of the battery module. This structure ensures that the telescopic 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 installation part 232 and the end of the deformation part 22 also enhances the mechanical strength of the strap assembly 2, which is of great significance for resisting accidental impacts that the battery module may encounter during transportation or use.

[0086] It should be noted that the hole edge of the installation hole 224 refers to the edge part of the installation 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 arranged to be dimensionally adapted to the elastic main body 231. In this way, the dimensional adaptation of the mounting hole 224 and the elastic main body 231 ensures that the elastic main body 231 can be accurately mounted on the deformation part 22. The dimensional adaptation also prevents the elastic main body 231 from shifting or jamming during the dynamic process, ensuring the smoothness and reliability of the telescopic adjustment of the belt assembly 2, which helps to maintain the structural stability of the overall belt assembly 2 and the correct working state of the elastic main body 231.

[0088] In one embodiment, there is a gap between the inner wall of the mounting hole 224 and the outer edge of the elastic main body 231. With such a structural arrangement, a gap is reserved between the mounting hole 224 and the elastic main body 231, which provides additional movement space for the elastic main body 231, enabling it to expand and contract more freely when the size of the battery module changes, reducing frictional losses and extending the service life of the elastic main body 231. The existence of the gap can also help relieve the material deformation caused by changes in external factors, reducing potential damage to the overall structure of the belt assembly 2 and the battery module. In addition, the gap enables the elastic main body 231 to absorb and buffer vibrations and impacts that the battery module may encounter during transportation or use, improving the reliability and durability of the battery device.

[0089] In one embodiment, the belt assembly 2 includes a belt main body 21 and a deformation part 22, and the deformation part 22 forms at least part of the belt assembly 2; a mounting hole 224 is provided through the deformation part 22 along the extending direction of the belt main body 21; the elastic part 23 includes an elastic main body 231 and a mounting member 232, the mounting member 232 is connected to the end of the elastic main body 231, and the elastic main body 231 is inserted into the mounting hole 224. There are at least two elastic main bodies 231 and at least two mounting holes 224, and the at least two elastic main bodies 231 and the at least two mounting holes 224 are arranged in one-to-one correspondence. With such a structural arrangement, by providing multiple elastic main bodies 231 and corresponding mounting holes 224, the belt assembly 2 can more evenly disperse 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 main body 231 and the mounting hole 224 ensures that each elastic main body 231 can function independently and accurately. Even if some elastic main bodies 231 fail, other elastic main bodies 231 can still continue to provide the necessary telescopic adjustment, enhancing the redundancy and fault tolerance of the belt assembly 2.

[0090] In one embodiment, the strap assembly 2 includes a strap body 21 and a deformation portion 22, and the deformation portion 22 forms at least a part of the strap assembly 2; an installation hole 224 is provided through the deformation portion 22 along the extension direction of the strap body 21; the elastic portion 23 includes an elastic main body 231 and an installation member 232, the installation member 232 is connected to the end of the elastic main body 231, and the elastic main body 231 is inserted into the installation hole 224. The installation member 232 is located at the end of the deformation portion 22 and is disposed opposite to the installation hole 224, and the outer edge of the installation member 232 protrudes from the hole edge of the installation hole 224, and the installation member 232 is used to abut against the end of the deformation portion 22. There are at least two elastic main bodies 231, and there are at least two installation holes 224, and the at least two elastic main bodies 231 and the at least two installation holes 224 are arranged in one-to-one correspondence. With such a structural arrangement, the presence of the deformation portion 22 enables the strap to elastically deform according to the size change of the battery body 1, and the elastic main body 231 inserted into the installation hole 224 provides the necessary expansion and contraction force when the battery contracts, ensuring that the strap can smoothly adapt to the volume change of the battery cell 11, reducing the mechanical pressure on the battery cell 11, thereby protecting the battery cell 11 from damage and improving the service life and safety of the battery module. The protruding design of the installation member 232 ensures the stable installation of the elastic main body 231 at the end of the deformation portion 22, restricts the lateral movement of the elastic main body 231, and increases the reliability of the overall structure. The arrangement of multiple elastic main bodies 231 further improves the adjustment ability and stress dispersion performance of the strap assembly 2, enabling the strap to perform adaptive adjustment within a larger range, adapting to a larger number of battery cells 11 or a larger range of size changes, and enhancing the stability and adaptability of the battery module.

[0091] Specifically, the strap assembly 2 extends along the length direction of the battery body 1. Among them, the maximum deformation length of at least a part of the strap assembly 2 in the extension direction of the strap assembly 2 is greater than 0 mm and less than or equal to Amm; where A = 2n and n is the number of battery cells 11. With such a structural arrangement, the strap assembly 2 is designed along the length direction of the battery body 1, enabling it to be consistent with the length direction of the battery body 1, facilitating the dense arrangement and fixation of the battery cells 11. The maximum deformation length limit of the strap assembly 2 ensures that the strap assembly 2 can adapt to the size change of the battery cell 11 while not being unable to effectively adjust due to insufficient deformation, thus maintaining the structural stability of the strap assembly 2 and the reliability of the battery cell 11 fixation.

[0092] In one embodiment, the strap assembly 2 is in a ring structure, and the strap assembly 2 is sleeved on the battery body 1. In this way, the ring-shaped strap assembly 2 can evenly distribute the pressure on the entire periphery of the battery body 1, effectively avoiding the problem of excessive local pressure, reducing the risk of damage to the battery cell 11 during fixation, and improving the overall stability and life of the battery module.

[0093] In one embodiment, asFigure 8 and Figure 9 As shown in Figure 9 , the battery body 1 further includes an end plate 12. The end plate 12 is located at the end of a plurality of battery cells 11, and an installation groove 121 is provided on the end plate 12. 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 a scroll part 24. The scroll part 24 is wound along a preset central axis. One end of the scroll part 24 away from the preset central axis is a free end 241, and the free end 241 is connected to the end of the strap body 21. The scroll part 24 is arranged in the installation groove 121. With such a structural arrangement, by adding the scroll part 24 to the strap assembly 2, the strap can be elastically adjusted through the winding and unwinding of the scroll part 24, further improving the adaptability of the strap assembly 2 to the size change of the battery body 1. The free end 241 of the scroll part 24 is connected to the end of the strap body 21, ensuring the power transmission between the two, so that the stretching of the strap body 21 and the winding and unwinding of the scroll part 24 can be synchronized. Arranging the scroll part 24 in the installation groove 121 of the end plate 12 not only saves space, but also protects the scroll part 24 from the influence of the external environment, prolongs its service life, and at the same time makes the overall layout more tidy and orderly, which is beneficial to the effective management and utilization of the internal space of the battery module.

[0094] In one embodiment, as shown in Figure 9 Figure 9 , 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 intersects with the second preset direction X2. The strap assembly 2 further includes a torsion connecting piece 25. One end of the torsion connecting piece 25 is connected to the free end 241, and the other end is connected to the end of the strap body 21. The torsion connecting piece 25 has a torsion surface 251, and the torsion surface 251 is used to abut against and limit the edge 1211 of the notch of the installation groove 121. With such a structural arrangement, through the torsion of the torsion connecting piece 25, the scroll part 24 can be arranged vertically in the installation groove 121, reducing the occupied space of the scroll part 24 in the battery device and avoiding excessive occupation of the length of the battery device. The torsion surface 251 of the torsion connecting piece 25 abuts against and limits the edge 1211 of the notch of the installation groove 121, ensuring the accurate positioning of the strap assembly 2 during the telescopic adjustment process and avoiding the structural instability caused by excessive elongation.

[0095] Specifically, the torsion connecting piece 25, the free end 241 and the end of the strap body 21 are connected by welding. In this way, a high-strength mechanical connection can be achieved, ensuring that each part of the strap assembly 2 can work together as a whole when the size of the battery module changes, and avoiding the influence of the looseness of the connection on the telescopic adjustment performance of the strap assembly 2 during the charging and discharging process of the battery.

[0096] Specifically, as the scroll portion 24 is rolled up, the free end 241 can move in a direction close to or away from the strap body 21, and the maximum movement distance of the free end 241 is less than or equal to 30 mm. In this way, a reasonable expansion and contraction adjustment range can be provided during the expansion and contraction of the battery module due to the charging and discharging of the battery cell 11. Such a design not only takes into account the dimensional changes of the battery cell 11 under extreme working conditions, but also avoids damage to the mechanical structure of the strap assembly 2 caused by excessive expansion and contraction, thereby ensuring the long-term stability and safety of the strap assembly 2 during the battery charging and discharging cycle.

[0097] Specifically, there are two volutes 24, which are respectively arranged at the two ends of the tie body 21. There are two tie assemblies 2, which are respectively arranged on the opposite sides of the battery body 1 to form a tie group, and the two tie assemblies 2 are arranged opposite to each other. There are at least two tie groups, and at least two tie groups are arranged at intervals along the height direction of the battery body 1. With such a structural arrangement, by arranging a volute 24 at each end of the tie body 21, and configuring the tie assemblies 2 on the opposite sides of the battery body 1 to form a tie group, the expansion and contraction force of the tie assembly 2 can be more evenly distributed along the length direction of the battery body 1, reducing the non-uniform stress on the battery cell 11, and improving the structural integrity of the battery module and the cycle stability of the battery cell 11. The two tie assemblies 2 arranged opposite to each other can apply a balanced restraining force to the battery body 1 from opposite directions, which helps to maintain the position of the battery cell 11, and even in the process of expansion or contraction of the battery module, the position displacement of the battery cell 11 can be avoided, thereby ensuring stable contact and good thermal management performance between the battery cells 11 inside the battery module. The strap groups arranged at intervals along the height direction of the battery body 1 can more evenly distribute the stress on the battery body 1 .

[0098] In one embodiment, the battery body 1 further includes a buffer insulation pad 13, which is disposed between two adjacent battery cells 11. With such a structural arrangement, the buffer insulation pad 13 is disposed between the battery cells 11, which can effectively absorb the slight displacement caused by the expansion or contraction of the battery cells 11 during the charging and discharging process of the battery, reduce the mechanical stress between the battery cells 11 due to the size change, and thus extend the service life of the battery cells 11. In addition, the buffer insulation pad 13 can also isolate the heat conduction between the battery cells 11, prevent the thermal runaway caused by the overheating of a single battery cell 11 from propagating to the entire battery module, and improve 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 such a structural setting, the buffer heat insulation pad 13 can have sufficient strength and durability, and can provide a certain buffering effect during the size change of the battery module.

[0100] Specifically, the thermal conductivity of the buffer heat insulation pad 13 is less than or equal to 0.05 W / (m·K). In this way, the buffer heat insulation pad 13 with low thermal conductivity can effectively block the heat transfer between the battery cells 11, significantly reduce the heat diffusion rate, 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). In this way, the buffer heat insulation pad 13 needs to have both buffer and heat insulation functions. The buffer performance requires the material to have good elastic strain ability. The traditional buffer heat insulation pad 13 is generally a soft material such as foam, and its heat insulation performance is poor. The heat insulation performance requires the material to have a low thermal conductivity, but the low thermal conductivity materials are generally hard, and their elastic strain ability is poor. Most of the traditional buffer heat insulation pads 13 use a combination of a soft material with high elastic strain and a hard material with low thermal conductivity, and the processing technology is relatively complex and the cost is high. However, for the battery module with the belt assembly 2 provided in this embodiment, the heat insulation performance of the battery module is realized by using a high-hardness and low-thermal-conductivity material between the battery cells 11, and the buffer performance is realized by the belt assembly 2, which can effectively reduce the cost.

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

[0103] Using the energy storage system provided by an embodiment of the present invention, the deformable part of the strap assembly 2 can deform naturally as the battery body 1 expands and contracts during the charge and discharge processes, effectively absorbing the stress generated during the expansion of the battery cell 11, avoiding the direct action of 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. The traditional strap assembly 2 can usually only passively adapt to the increase of the battery body 1 when it expands. However, when the battery discharges or cools down, the retracted battery body 1 fails to be effectively supported, and the strap assembly 2 often cannot actively retract, resulting in an increase in the gap between the battery cells 11 and affecting the overall structural stability and energy density of the module. The introduced elastic part 23 has a two-way adjustment ability. It can not only stretch along with the expansion of the battery body 1, but more importantly, when the battery body 1 retracts, the elastic part 23 can actively return to its original state, driving at least part of the strap assembly 2 to retract accordingly, and tightly fixing the battery cells 11 again, thus maintaining the consistency and high efficiency of the battery module. At least part of the strap assembly 2 works in cooperation with the elastic part 23 to ensure that the dynamic dimensional changes of the battery cells 11 during the charge and discharge processes are smoothly absorbed and released. This mechanism avoids the extrusion of the battery cells 11 under extreme expansion conditions and also prevents the generation of gaps due to the rigidity of the strap assembly 2 when the battery cells 11 retract, effectively extending the cycle life of the battery body 1, reducing the failure rate, and improving the reliability of the battery device. Therefore, through the energy storage system provided by this embodiment, the problem that the strap of the battery module in the prior art cannot adjust its length with the expansion and contraction of the battery cells can be solved.

[0104] An embodiment of the present invention provides an electrical device, and the electrical device includes the above-mentioned battery device.

[0105] With the electrical device provided by an embodiment of the present invention, the deformable part of the strap assembly 2 can deform naturally as the battery body 1 expands and contracts during the charge and discharge process, which effectively absorbs the stress generated during the expansion of the battery cell 11, avoids the direct action of excessive mechanical pressure on the battery cell 11, and thus extends the service life of the battery cell 11 and even the entire battery device. The traditional strap assembly 2 can usually only passively adapt to the increase of the battery body 1 when it expands. However, when the battery discharges or cools down, the retracted battery body 1 fails to be effectively supported, and the strap assembly 2 often cannot retract actively, resulting in an increase in the gap between the battery cells 11, affecting the overall structural stability and energy density of the module. The introduced elastic part 23 has a two-way adjustment ability. It can not only stretch along with the expansion of the battery body 1, but more importantly, when the battery body 1 retracts, the elastic part 23 can actively return to its original state, driving at least part of the strap assembly 2 to retract accordingly, and tightly fixing the battery cells 11 again, thereby maintaining the consistency and high efficiency of the battery module. At least part of the strap assembly 2 works in cooperation with the elastic part 23 to ensure that the dynamic dimensional changes of the battery cells 11 during the charge and discharge process are smoothly absorbed and released. This mechanism avoids the squeezing force on the battery cells 11 in the extreme expansion state, and also prevents the gaps generated by the stiffness of the strap assembly 2 when the battery cells 11 retract, effectively extending the cycle life of the battery body 1, reducing the failure rate, and improving the reliability of the battery device. Therefore, through the electrical device provided by this embodiment, the problem that the strap of the battery module in the prior art cannot adjust its length with the expansion and contraction of the battery cells can be solved.

[0106] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present application. In actual applications, various changes can be made in form and details without departing from the spirit and scope of the present application. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application should be subject to the scope defined by the claims.

Claims

1. A battery device, characterized in that, Comprising: A battery body (1), including a plurality of juxtaposed battery cells (11); A strap assembly (2), connected to the battery body (1) to fix the plurality of battery cells (11); the strap assembly (2) includes a strap body (21) and a deformation part (22) provided on the strap body (21), the deformation part (22) is deformably arranged along the extension direction of the strap assembly (2) so as to elongate as the battery body (1) expands; An elastic part (23), extending along the extension direction of the strap assembly (2) and provided on the strap assembly (2), one end of the elastic part (23) is connected to one end of the deformation part (22), and the other end of the elastic part (23) is connected to the other end of the deformation part (22) so as to elongate as the battery body (1) expands, recover as the battery body (1) retracts, and drive the deformation part (22) to recover.

2. The battery device according to claim 1, wherein, The deformation part (22) includes at least two deformation connectors (220), and the at least two deformation connectors (220) are sequentially connected along the extension direction of the strap body (21), and one of the adjacent two deformation connectors (220) is movably arranged relative to the other to adjust the overall length of the at least two deformation connectors (220) along the extension direction of the strap body (21).

3. The battery device according to claim 2, characterized in that, Both ends of the deformation part (22) are hinged to the strap body (21), and adjacent two deformation connectors (220) are hinged to each other; or, Adjacent two of the deformation connectors (220) are both tubular structures, and one of the adjacent two deformation connectors (220) is sleeved on the other and is movably arranged along the extension direction of the strap body (21).

4. The battery device according to claim 1, wherein, The deformation part (22) includes a folding structure; wherein: The folding structure includes a first folding piece (221), a second folding piece (222) and a third folding piece (223) sequentially connected along the extension direction of the strap assembly (2), the first folding piece (221) and the second folding piece (222) are oppositely arranged, and the second folding piece (222) and the third folding piece (223) are oppositely arranged; and / or, The folding structure is an S-shaped structure; and / or, There are a plurality of the folding structures, and the plurality of folding structures are sequentially connected along the extension direction of the strap assembly (2).

5. The battery device according to claim 1, characterized in that, Both the deformation part (22) and the elastic part (23) are in plurality, the plurality of deformation parts (22) are spaced apart on the strap body (21), and the plurality of deformation parts (22) and the plurality of elastic parts (23) are arranged in one-to-one correspondence.

6. The battery device according to claim 1, characterized in that, The elastic part (23) is located on one side of the deformation part (22); the elastic part (23) includes an elastic main body (231) and two mounting parts (232), the elastic main body (231) extends along the extension direction of the strap assembly (2), one end and the other end of the elastic main body (231) are respectively connected to the two mounting parts (232), and the two mounting parts (232) are both fixed on the strap assembly (2).

7. The battery device according to claim 1, characterized in that, An installation hole (224) is formed through the deformation part (22) along the extension direction of the belt main body (21); the elastic part (23) includes an elastic main body (231) and a mounting part (232), the mounting part (232) is connected to the end of the elastic main body (231), and the elastic main body (231) is inserted into the installation hole (224); wherein: The mounting part (232) is located at the end of the deformation part (22) and is arranged opposite to the installation hole (224), the outer edge of the mounting part (232) protrudes from the hole edge of the installation hole (224), and the mounting part (232) is used for abutting against the end of the deformation part (22); and / or, There are at least two elastic main bodies (231), there are at least two installation holes (224), and at least two elastic main bodies (231) and at least two installation holes (224) are arranged in one-to-one correspondence.

8. The battery device according to any one of claims 1 to 7, characterized in that, The belt assembly (2) extends along the length direction of the battery main body (1); Wherein, the maximum deformation length of the deformation part (22) in the extension direction of the belt assembly (2) is greater than 0 mm and less than or equal to A mm; wherein, A = 2n, and n is the number of the battery cells (11).

9. The battery device according to claim 1, characterized in that, The battery main body (1) further includes end plates (12), the end plates (12) are located at the ends of the plurality of battery cells (11), and mounting grooves (121) are formed in the end plates (12); one end of the belt main body (21) is fixed to one side of the battery main body (1), and the other end of the belt main body (21) is fixed to the other side of the battery main body (1); The belt assembly (2) further includes: A scroll part (24), the scroll part (24) is wound along a preset central axis, one end of the scroll part (24) away from the preset central axis is a free end (241), and the free end (241) is connected to the end of the belt main body (21); the scroll part (24) is arranged in the mounting groove (121).

10. The battery device according to claim 9, characterized in that, The free end (241) extends along a first preset direction (X1), the end of the belt main body (21) extends along a second preset direction (X2), and the first preset direction (X1) intersects with the second preset direction (X2); the belt assembly (2) further includes: A torsion connecting piece (25), one end of the torsion connecting piece (25) is connected to the free end (241), the other end is connected to the end of the belt main body (21), and the torsion connecting piece (25) has a torsion surface (251), and the torsion surface (251) is used for abutting and limiting against the notch edge (1211) of the mounting groove (121).

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

12. An energy storage system, characterized in that, Including: The battery device according to any one of claims 1 to 11.

13. An electrical device, characterized in that, Comprising: The battery device according to any one of claims 1 to 11.

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