Battery device, electric device and restraint assembly

Abstract

The embodiment of the present application provides a battery device, a power utilization device and a binding assembly. The battery device comprises a plurality of battery monomer groups and a binding assembly. The plurality of battery monomer groups are arranged at intervals along a first direction, each battery monomer group comprises a plurality of battery monomers arranged along a second direction, and the second direction is perpendicular to the first direction. The binding assembly comprises a plurality of binding members and a flexible connecting member. The plurality of binding members are arranged along the first direction, the binding member is in a ring structure, each binding member is sleeved outside one battery monomer group, along the first direction, the binding member comprises a first wall and a second wall arranged oppositely, in two adjacent binding members, the first wall of one is arranged adjacent to the second wall of the other, and the flexible connecting member is located between two adjacent battery monomer groups, and the flexible connecting member connects the adjacent first wall and the second wall. The technical scheme of the present application can improve the safety and reliability of the battery device.

Description

Technical Field

[0001] This application relates to the field of battery device technology, and more specifically, to a battery device, electrical equipment, and restraint assembly. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the manufacturing process of battery devices, the safety and reliability of the devices are issues that cannot be ignored. Therefore, how to improve the safety and reliability of battery devices is a technical problem that urgently needs to be solved in battery device technology. Utility Model Content

[0004] This application provides a battery device, an electrical appliance, and a restraint assembly that can improve the safety and reliability of the battery device.

[0005] This application is achieved through the following technical solution: In a first aspect, embodiments of this application provide a battery device comprising a plurality of battery cell groups and a restraining assembly. The plurality of battery cell groups are spaced apart along a first direction, and each battery cell group includes a plurality of battery cells arranged along a second direction perpendicular to the first direction. The restraining assembly includes a plurality of restraining members and a flexible connector. The plurality of restraining members are arranged along the first direction, and the restraining members are annular structures, with each restraining member fitted over the outside of a battery cell group. Along the first direction, each restraining member includes a first wall and a second wall disposed opposite to each other, wherein the first wall of one of two adjacent restraining members is adjacent to the second wall of the other. The flexible connector is located between two adjacent battery cell groups, and the flexible connector connects the adjacent first wall and second wall.

[0006] According to the battery device of this application embodiment, multiple restraint members are connected as one unit by flexible connectors, enabling synchronous restraint of multiple battery cell groups, which is convenient and quick to assemble. Since the restraint members need to provide constraint to the battery cell groups, they have a certain degree of rigidity. Furthermore, because adjacent restraint members are connected by flexible connectors, the flexible connectors can undergo flexible deformation to absorb the expansion force of the battery cells. When the expansion degrees of different battery cell groups are inconsistent, the restraint members are connected by the extensible flexible connectors, allowing a certain degree of relative displacement and stress release. This transforms the concentrated tensile stress that originally acted on the rigid restraint members and could potentially cause them to break into dispersed stress that can be absorbed and buffered by the flexible connectors, reducing the risk of restraint member breakage. Simultaneously, the flexible connectors absorb the expansion force of the battery cells, keeping the multiple restraint members connected. The restraint members have a good restraining effect on the battery cell groups, maintaining good structural integrity of the battery device and improving its safety and reliability. In addition, during the maintenance of the battery device, the expansion and deformation of the battery cells cause the gap between two adjacent battery cell groups to become smaller. The flexible connector can absorb the tensile force of the restraint component, so that the restraint component can move between two adjacent battery cell groups, making it easier to complete the reliable and non-destructive disassembly and assembly operations of the restraint component in a narrow gap.

[0007] According to some embodiments of this application, the flexible connector is disposed around the outside of the first wall and the second wall.

[0008] In the above scheme, the flexible connector is wrapped around the outside of the first wall and the second wall, so that there is a large connection area between the flexible connector and the first wall and the second wall, which makes the connection between the flexible connector and the first wall and the second wall more reliable. It is convenient to absorb the tensile stress applied to the first wall and the second wall by the expansion and deformation of the battery cell through the flexible connector, so that the first wall and the second wall can maintain the connection state and reduce the risk of tearing of the first wall and the second wall.

[0009] According to some embodiments of this application, the flexible connector has a first constraint space, and both the first wall and the second wall pass through the first constraint space.

[0010] In the above scheme, by having both the first wall and the second wall pass through the first constraint space, the flexible connector wraps around the structure formed by the first wall and the second wall. The flexible connector has a good constraint effect on the first wall and the second wall, and is convenient to absorb the tensile stress transmitted to the first wall and the second wall by the expansion of the battery cell.

[0011] According to some embodiments of this application, the flexible connector includes a first part, a second part, and a third part. The first part is disposed around the outside of the first wall and the second wall. The two ends of the first part are respectively connected to the second part and the third part. The second part and the third part are stacked and connected so that the first part, the second part, and the third part enclose a first constraint space.

[0012] In the above scheme, the first part is wrapped around the outside of the first wall and the second wall. The two ends of the first part are connected to the second part and the third part respectively. The second part and the third part are stacked and connected, and the first part, the second part and the third part together form a first constraint space that surrounds the first wall and the second wall. This facilitates the assembly of the flexible connector with the first wall and the second wall. Furthermore, the second part and the third part have high connection reliability, so that the flexible connector has a good constraint effect on the first wall and the second wall.

[0013] According to some embodiments of this application, on the same projection plane perpendicular to the first direction, the orthographic projection of the second part and the orthographic projection of the third part do not overlap with the orthographic projection of the first wall, and the orthographic projection of the second part and the orthographic projection of the third part do not overlap with the orthographic projection of the second wall.

[0014] In the above scheme, the orthographic projections of the second part and the third part do not overlap with the orthographic projection of the first wall, which facilitates the assembly of the binding component and the battery cell group. Furthermore, the second and third parts do not occupy the space between the battery cell group and the first or second wall, which is beneficial for the expansion and deformation of the battery cell.

[0015] According to some embodiments of this application, the second part and the third part are located on the same side of the first wall and the second wall along the third direction, and the third direction, the second direction and the first direction are perpendicular to each other.

[0016] In the above scheme, the second part and the third part are located on the same side of the first wall and the second wall along the third direction. When assembling the binding assembly with multiple battery cell groups, it can be sleeved from the side of the first wall and the second wall where the second part and the third part are not set towards the multiple battery cell groups, thereby reducing the risk of damage to the connection area of ​​the second part and the third part, which is conducive to maintaining the integrity of the flexible connector and reducing the risk of damage to the flexible connector during the assembly of the binding assembly with multiple battery cell groups, so that the binding assembly has a better binding effect on multiple battery cell groups.

[0017] According to some embodiments of this application, the second part and the third part have an overlapping area, the dimension of which in the width direction is greater than or equal to 10 mm; the width direction of the overlapping area is perpendicular to the length direction of the first wall.

[0018] In the above scheme, the overlapping area is the connection area between the second part and the third part. The dimension of the overlapping area in its width direction is greater than or equal to 10mm, so that there is a large connection area between the second part and the third part, which makes the flexible connector have high overall reliability. It can facilitate the flexible connector to absorb the tensile stress of the first wall and the second wall through elastic deformation, and reduce the risk of the flexible connector being damaged by pulling.

[0019] According to some embodiments of this application, the first part, the second part, and the third part are integrally formed.

[0020] In the above scheme, the first part, the second part and the third part can be provided by a single sheet, and the two ends of the sheet are connected. The structure is simple, and the flexible connector has high overall reliability. It is easy for the flexible connector to absorb the tensile stress of the first wall and the second wall through elastic deformation, thereby reducing the risk of the flexible connector being damaged by pulling.

[0021] According to some embodiments of this application, the thickness of the flexible connector is 0.07mm to 0.09mm.

[0022] In the above scheme, the thickness of the flexible connector is greater than or equal to 0.07 mm, which gives the flexible connector high overall strength and reduces the risk of the flexible connector being damaged by pulling; the thickness of the flexible connector is less than or equal to 0.09 mm, which gives the flexible connector a smaller assembly space, reduces space waste, and gives the battery device a higher energy density.

[0023] According to some embodiments of this application, the flexible connector includes a polyimide film, a cloth tape, or a polytetrafluoroethylene film.

[0024] In the above solutions, polyimide film, cloth tape or polytetrafluoroethylene film all have good insulation effect, which helps to reduce the risk of short circuit between positive and negative electrodes.

[0025] According to some embodiments of this application, adjacent first walls and second walls are connected by a plurality of flexible connectors, which are spaced apart along the length direction of the first wall.

[0026] In the above scheme, multiple flexible connectors are spaced apart along the length direction of the first wall, which can connect the first wall and the second wall at multiple positions along the length direction of the first wall. This facilitates the restraint of the first wall and the second wall, reduces the risk of the first wall and the second wall becoming disconnected, and keeps the multiple restraints connected.

[0027] According to some embodiments of this application, the first wall includes a first end and a second end disposed opposite to each other along a second direction; a plurality of flexible connectors are spaced apart along the second direction, the plurality of flexible connectors including a first end connector and a second end connector, the first end connector being disposed at the first end and the second end connector being disposed at the second end; in each battery cell group, along the second direction, the two battery cells that are furthest apart among the plurality of battery cells are respectively the first end battery cell and the second end battery cell; on the same projection plane perpendicular to the first direction, the orthographic projection of the first end battery cell falls into the orthographic projection of the first end connector, and the orthographic projection of the second end battery cell falls into the orthographic projection of the second end connector.

[0028] In the above scheme, the first end battery cell and the second end battery cell are distributed at both ends of multiple battery cells in the second direction. During the charging and discharging process of the battery device, the expansion stress of the first end battery cell and the second end battery cell in the first direction is large. The first end connector is set to correspond to the first end battery cell and the second end connector is set to correspond to the second end battery cell. This can absorb the expansion stress of the first end battery cell and the second end plate battery cell, so that the adjacent first wall and second wall remain connected.

[0029] According to some embodiments of this application, the restraint is a metal part, and each restraint is provided with an insulating part, the insulating part covering at least the surface of the first wall facing the second wall and the surface of the second wall facing the first wall.

[0030] In the above scheme, by covering at least the surface of the first wall facing the second wall and the surface of the second wall facing the first wall with the insulating component, an insulating barrier can be formed between the restraint component and the battery cell assembly, thereby reducing the risk of short circuit between the positive and negative electrodes.

[0031] According to some embodiments of this application, the insulating member includes a first insulating portion and a second insulating portion, both of which are tubular members. A first wall passes through the first insulating portion, and a second wall passes through the second insulating portion. A flexible connector is wound around the adjacent first and second insulating portions on the adjacent first and second walls.

[0032] In the above scheme, both the first insulating part and the second insulating part are tubular, which facilitates the assembly of the first wall with the first insulating part and the assembly of the second wall with the second insulating part; the flexible connector is wrapped around the adjacent first insulating part and the second insulating part, so that when the flexible connector is connected to the first wall and the second wall, it can constrain the first insulating part and the second insulating part, reducing the risk of displacement of the first insulating part and the second insulating part.

[0033] According to some embodiments of this application, the restraint member further includes a third wall, a fourth wall, a first transition wall, a second transition wall, a third transition wall, and a fourth transition wall. The third wall and the fourth wall are arranged opposite each other along a second direction. The first wall and the third wall are connected by the first transition wall, the first wall and the fourth wall are connected by the second transition wall, the second wall and the third wall are connected by the third transition wall, and the second wall and the fourth wall are connected by the fourth transition wall. The first transition wall and the second transition wall are both inserted through the first insulating portion, and the third transition wall and the fourth transition wall are both inserted through the second insulating portion.

[0034] In the above scheme, the first insulating part extends to the first transition wall and the second transition wall, and the second insulating part extends to the third transition wall and the fourth transition wall, so that the first insulating part and the second insulating part have a good insulation effect on both sides of the battery cell pack along the second direction, which can reduce the risk of short circuit between the restraint member and the battery cell pack.

[0035] According to some embodiments of this application, the first insulating part and the second insulating part are separately disposed.

[0036] In the above scheme, the first insulating part and the second insulating part are separately provided, which can be independently processed and manufactured, thereby improving the processing and manufacturing efficiency, and facilitating the assembly of the first insulating part and the first wall, and the assembly of the second insulating part and the second wall.

[0037] According to some embodiments of this application, a first insulating portion and a second insulating portion are circumferentially spaced along the circumferential direction of the restraint member, at least a portion of a third wall is exposed between the first insulating portion and the second insulating portion, and at least a portion of a fourth wall is exposed between the first insulating portion and the second insulating portion.

[0038] In the above scheme, the first insulating part and the second insulating part are arranged at intervals along the circumference of the binding member, and at least a portion of the third wall is not covered by the first insulating part and the second insulating part, and at least a portion of the fourth wall is not covered by the first insulating part and the second insulating part, so that the length of the first insulating part and the second insulating part can be set to be shorter, reducing material waste.

[0039] According to some embodiments of this application, each battery cell group further includes a first end plate and a second end plate disposed opposite to each other along a second direction. In each battery cell group, along the second direction, all battery cells are located between the first end plate and the second end plate. On the same projection plane perpendicular to the second direction, the orthographic projection of the first insulating portion at least partially overlaps with the orthographic projection of the first end plate, the orthographic projection of the second insulating portion at least partially overlaps with the orthographic projection of the first end plate, the orthographic projection of the first insulating portion at least partially overlaps with the orthographic projection of the second end plate, and the orthographic projection of the second insulating portion at least partially overlaps with the orthographic projection of the second end plate.

[0040] In the above scheme, the first end plate and the second end plate are respectively located on both sides of the multiple battery cells along the second direction. The restraining member cooperates with the first end plate and the second end plate to constrain the expansion deformation of the multiple battery cells. With the second direction as the projection direction, the orthographic projection of the first insulating part and the orthographic projection of the second insulating part overlap with the orthographic projection of the first end plate at least partially. The orthographic projection of the first insulating part and the orthographic projection of the second insulating part overlap with the orthographic projection of the second end plate at least partially, which can reduce the risk of short circuit between the restraining member and the battery cells.

[0041] According to some embodiments of this application, both the first insulating part and the second insulating part are insulating heat shrink tubing.

[0042] In the above scheme, both the first insulating part and the second insulating part are insulating heat shrink tubing, which can shrink after heating (such as heating to 100℃~125℃) to fit with the restraint, so that the first insulating part and the restraint, as well as the second insulating part and the restraint, have good connection reliability.

[0043] According to some embodiments of this application, the thickness of the first insulating portion is 0.05mm to 0.15mm; and / or, the thickness of the second insulating portion is 0.05mm to 0.15mm.

[0044] In the above scheme, by making the thickness of the first insulating part greater than or equal to 0.05 mm, the first insulating part has a better insulation effect; by making the thickness of the first insulating part less than or equal to 0.15 mm, the first insulating component occupies a smaller assembly space. By making the thickness of the second insulating part greater than or equal to 0.05 mm, the second insulating part has a better insulation effect; by making the thickness of the second insulating part less than or equal to 0.15 mm, the second insulating component occupies a smaller assembly space.

[0045] According to some embodiments of this application, the insulating member is a tubular structure, and the restraining member is integrally inserted through the insulating member.

[0046] In the above scheme, by making the restraint component pass through the insulating component as a whole, the insulating component forms an insulating protective layer on the surface of the restraint component, thereby reducing the risk of short circuit between the restraint component and the battery cell.

[0047] According to some embodiments of this application, the insulating material includes polyethylene terephthalate or polyvinyl chloride.

[0048] In the above scheme, polyethylene terephthalate or polyvinyl chloride both have good insulation and protection effects, and can shrink after heating, which makes it easy to form an insulating and protective layer on the surface of the restraint.

[0049] According to some embodiments of this application, the surface roughness of the insulating element is greater than that of the flexible connector.

[0050] In the above scheme, compared with the insulating parts, the flexible connectors are smoother, which can reduce the assembly difficulty of the binding components and the battery cells and facilitate the improvement of assembly efficiency.

[0051] According to some embodiments of this application, the ratio of the surface roughness of the insulating element to the surface roughness of the flexible connector is 10 to 100.

[0052] In the above scheme, the surface roughness difference between the insulating component and the flexible connector is large. The flexible connector has a high surface smoothness, which helps to reduce the friction between the flexible connector and the battery cell assembly, and facilitates the rapid assembly of the binding assembly and the battery cell assembly.

[0053] According to some embodiments of this application, the first wall includes a plurality of first side surfaces, which are arranged circumferentially along the length of the first wall when viewed from the length direction; two adjacent first side surfaces are connected by a first arc surface with a radius of 10 μm to 50 μm; and / or, the second wall includes a plurality of second side surfaces, which are arranged circumferentially along the length of the second wall when viewed from the length direction; two adjacent second side surfaces are connected by a second arc surface with a radius of 10 μm to 50 μm.

[0054] In the above scheme, two adjacent first sides are connected by a first arc surface with a radius of 10μm to 50μm, resulting in a smooth transition between the two adjacent first sides. This reduces the risk of the restraint component scratching the flexible connector or insulator, thus extending the service life of the flexible connector or insulator. Similarly, two adjacent second sides are connected by a second arc surface with a radius of 10μm to 50μm, again resulting in a smooth transition between the two adjacent second sides. This further reduces the risk of the restraint component scratching the flexible connector or insulator, and also extends the service life of the flexible connector or insulator.

[0055] Secondly, embodiments of this application also provide an electrical device that includes a battery device as described above, the battery device being used to provide electrical energy.

[0056] Thirdly, this application also provides a restraint assembly, which includes a plurality of restraint members and a flexible connector; the plurality of restraint members are arranged along a first direction, the restraint members are ring-shaped structures, and along the first direction, the restraint members include a first wall and a second wall disposed opposite to each other, in two adjacent restraint members, the first wall of one is disposed adjacent to the second wall of the other, and the first direction is perpendicular to the length direction of the first wall; the flexible connector connects the adjacent first wall and second wall.

[0057] According to the restraint assembly of this application embodiment, multiple restraint members are connected as one unit by flexible connectors, exhibiting high overall integrity and facilitating mutual constraint of the multiple restraint members. Since adjacent restraint members are connected by flexible connectors, these connectors can undergo flexible deformation to absorb tensile stress in the restraint members. When the restraint assembly is assembled with multiple battery cell groups, if the expansion degrees of different battery cell groups are inconsistent, the restraint members are connected by the extensible flexible connectors, allowing for a certain degree of relative displacement and stress release. This transforms the concentrated tensile stress that would have caused the restraint members to break, which was originally acting on the rigid restraint members, into dispersed stress that can be absorbed and buffered by the flexible connectors, reducing the risk of restraint member breakage. Simultaneously, the flexible connectors absorb the expansion force of the battery cells, ensuring that the multiple restraint members remain connected. The restraint members provide good constraint on the battery cell groups, maintaining good structural integrity of the battery device and improving its safety and reliability.

[0058] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0059] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0060] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments; Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application; Figure 3 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application; Figure 4 This is a schematic diagram of the structure of the restraint assembly provided in some embodiments of this application; Figure 5 Schematic diagrams of the structure of the restraint member provided in some embodiments of this application; Figure 6 A schematic diagram illustrating the assembly of the flexible connector with the first and second walls according to some embodiments of this application; Figure 7 A schematic diagram illustrating the assembly of the flexible connector with the first and second walls according to other embodiments of this application; Figure 8 A schematic diagram of the assembly of the first insulating part and the first wall provided for some embodiments of this application; Figure 9 This is a schematic diagram illustrating the assembly of the second insulating part and the second wall according to some embodiments of this application; Figure 10 for Figure 5 Enlarged view of a portion at point A; Figure 11 for Figure 5 A magnified view of section B; Figure 12 for Figure 5 A magnified view of a portion at point C; Figure 13 for Figure 5 A magnified view of a portion at point D; Figure 14 A schematic diagram of the assembly of the first insulating part and the second insulating part with the first end plate provided for some embodiments of this application; Figure 15 This is a schematic diagram of the assembly of the first insulating part and the second insulating part with the second end plate provided for some embodiments of this application.

[0061] Icons: 100 - Battery assembly; 10 - Housing; 11 - First sub-housing; 12 - Second sub-housing; 20 - Battery cell assembly; 21 - Battery cell; 21a - First end battery cell; 21b - Second end battery cell; 22 - First end plate; 23 - Second end plate; 30 - Restraint assembly; 31 - Restraint member; 311 - First wall; 311a - First end; 311b - Second end; 311c - First side surface; 311d - First arc surface; 312 - Second wall; 312a - Second side surface; 312b - Second arc surface; 313 - Third wall; 314 - Fourth Wall; 315-First transition wall; 316-Second transition wall; 317-Third transition wall; 318-Fourth transition wall; 32-Flexible connector; 32a-First constraint space; 321-First part; 322-Second part; 323-Third part; 324-Overlapping area; 325-First end connector; 326-Second end connector; 33-Insulator; 331-First insulating part; 332-Second insulating part; 34-Connector; 200-Controller; 300-Motor; 1000-Vehicle; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0062] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0063] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in this application and in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0064] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0065] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0066] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0067] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0068] In this application, "multiple" means two or more (including two).

[0069] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0070] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0071] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0072] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0073] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0074] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are interlocked to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first sub-enclosure may be a top cover or a bottom plate.

[0075] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0076] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0077] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0078] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0079] The development of battery device technology must take into account multiple design factors, such as performance parameters like energy density, discharge capacity, and charge / discharge rate. In addition, the safety and reliability of the battery device also need to be considered.

[0080] Battery devices typically consist of multiple battery cell groups, for example, multiple battery cell groups arranged along a first direction, with each battery cell group comprising multiple battery cells stacked along a second direction perpendicular to the first direction. To constrain the expansion and deformation of the battery cells and to position them correctly, each battery cell group is usually constrained by restraints to prevent misalignment of adjacent battery cell groups due to expansion, thus maintaining the integrity of the battery device. To improve assembly efficiency, multiple restraints are connected together to form an integrated restraint assembly, which is then assembled synchronously with the multiple battery cell groups during assembly. Adjacent restraints are typically rigidly connected (e.g., welded). During battery cell expansion, stress concentration at the connection point between adjacent restraints can cause damage, leading to restraint failure and potential electrical connection failure of the battery cells, thereby reducing the safety and reliability of the battery device.

[0081] To address the issue of low safety and reliability in battery devices, this application provides a battery device comprising multiple battery cell groups and a restraint assembly. The multiple battery cell groups are spaced apart along a first direction, and each battery cell group includes multiple battery cells arranged along a second direction perpendicular to the first direction. The restraint assembly includes multiple restraint members and flexible connectors. The multiple restraint members are arranged along the first direction, and the restraint members are annular structures, with each restraint member fitted over the outside of a battery cell group. Along the first direction, each restraint member includes a first wall and a second wall disposed opposite to each other, with the first wall of one restraint member adjacent to the second wall of the other. The flexible connector is located between two adjacent battery cell groups, connecting adjacent first and second walls.

[0082] In this battery device, multiple restraint components are connected together by flexible connectors, enabling synchronous restraint of multiple battery cell groups, facilitating convenient and quick assembly. Because the restraint components need to constrain the battery cell groups, they possess a certain degree of rigidity. Furthermore, since adjacent restraint components are connected by flexible connectors, these connectors can deform flexibly to absorb the expansion force of the battery cells. When the expansion degrees of different battery cell groups are inconsistent, the restraint components are connected by the extensible flexible connectors, allowing for a certain degree of relative displacement and stress release. This transforms the concentrated tensile stress that would have caused the rigid restraint components to break into dispersed stress that can be absorbed and buffered by the flexible connectors, reducing the risk of restraint component breakage. Simultaneously, the flexible connectors absorb the expansion force of the battery cells, keeping the multiple restraint components connected. The restraint components provide good restraint for the battery cell groups, maintaining good structural integrity of the battery device and improving its safety and reliability. In addition, during the maintenance of the battery device, the expansion and deformation of the battery cells cause the gap between two adjacent battery cell groups to become smaller. The flexible connector can absorb the tensile force of the restraint component, so that the restraint component can move between two adjacent battery cell groups, making it easier to complete the reliable and non-destructive disassembly and assembly operations of the restraint component in a narrow gap.

[0083] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application.

[0084] Electrical devices can include mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, such as airplanes, rockets, space shuttles, and spacecraft.

[0085] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0086] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0087] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0088] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0089] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell pack 20, the battery cell pack 20 being housed within the housing 10. The housing 10 provides a accommodating space for the battery cell pack 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, the first sub-housing 11 and the second sub-housing 12 overlapping each other, the first sub-housing 11 and the second sub-housing 12 jointly defining a accommodating space for accommodating the battery cell pack 20. The second sub-housing 12 may be a hollow structure with one open end, and the first sub-housing 11 may be a plate-like structure, the first sub-housing 11 covering the open side of the second sub-housing 12, so that the first sub-housing 11 and the second sub-housing 12 jointly define the accommodating space; the first sub-housing 11 and the second sub-housing 12 may also both be hollow structures with one open side, the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0090] In the battery device 100, there can be multiple battery cell groups 20, each battery cell group 20 including multiple battery cells 21. The multiple battery cells 21 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 21 are connected in both series and parallel. The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component for realizing the electrical connection between the multiple battery cells 21.

[0091] Among them, the battery cell 21 can be a secondary battery or a primary battery; the battery cell 21 can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to these.

[0092] Please refer to Figures 3 to 5 , Figure 3 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of the restraint assembly provided in some embodiments of this application. Figure 5 This is a schematic diagram of the structure of the restraint member provided in some embodiments of this application.

[0093] This application provides a battery device 100, which includes a plurality of battery cell groups 20 and a restraining assembly 30. The plurality of battery cell groups 20 are spaced apart along a first direction X, and each battery cell group 20 includes a plurality of battery cells 21 arranged along a second direction Y, which is perpendicular to the first direction X. The restraining assembly 30 includes a plurality of restraining members 31 and a flexible connector 32. The restraining members 31 are arranged along the first direction X and are annular in structure. Each restraining member 31 is fitted onto the outside of a battery cell group 20. Along the first direction X, each restraining member 31 includes a first wall 311 and a second wall 312 disposed opposite to each other. In two adjacent restraining members 31, the first wall 311 of one is adjacent to the second wall 312 of the other. The flexible connector 32 is located between two adjacent battery cell groups 20 and connects the adjacent first wall 311 and second wall 312.

[0094] A single battery cell 20 can form an independent battery unit, and multiple battery units can be connected in series, parallel, or in a mixed manner to meet different usage requirements.

[0095] In each battery cell group 20, multiple battery cells 21 are stacked along the second direction Y. The battery cell group 20 can be in the shape of a cuboid to make reasonable use of the internal space of the battery device 100.

[0096] The restraint member 31 can be a metal part, such as a steel strip; or it can be a non-metal part, such as a plastic strip. Optionally, the restraint member 31 is a steel strip with high tensile strength.

[0097] The restraint member 31 has a ring-shaped structure and can be formed by connecting the two ends of a strip material. The two ends of the strip material can be butt-jointed or overlapped. Optionally, the two ends of the strip material can be overlapped and welded together. Figure 5 As shown, the ends of the strip material can be overlapped and connected by connector 34 to form a ring-shaped restraint 31.

[0098] Multiple restraint members 31 are arranged along the first direction X. The first wall 311 and the second wall 312 of each restraint member 31 are arranged in the same order, such that in two adjacent restraint members 31, the first wall 311 of one is arranged adjacent to the second wall 312 of the other.

[0099] The flexible connector 32 is a connecting component that can flexibly deform itself. It can not only connect adjacent first walls 311 and second walls 312, but also absorb the tensile stress of the first walls 311 and second walls 312 through its own elastic deformation, so that the adjacent first walls 311 and second walls 312 remain connected.

[0100] In some embodiments, when the battery cell 21 does not expand or deform, the first wall 311 and the second wall 312 do not deform, the length direction of the first wall 311 is parallel to the length direction of the second wall 312, and the length direction of the first wall 311 is parallel to the second direction Y.

[0101] According to the battery device 100 of this application embodiment, multiple restraint members 31 are connected together by flexible connectors 32, which can realize the synchronous restraint of multiple battery cell groups 20, making assembly convenient and quick. Since the restraint members 31 need to provide constraint to the battery cell groups 20, they have a certain rigidity. Furthermore, since adjacent restraint members 31 are connected by flexible connectors 32, the flexible connectors 32 can undergo flexible deformation to absorb the expansion force of the battery cells 21. When the expansion degrees of different battery cell groups 20 are inconsistent, the restraint members 31 are connected by a flexible connector. The flexible connector 32 allows for a certain degree of relative displacement and stress release, thereby transforming the concentrated tensile stress that would have caused the rigid restraint 31 to break into dispersed stress that can be absorbed and buffered by the flexible connector 32, reducing the risk of the restraint 31 breaking. Simultaneously, the flexible connector 32 absorbs the expansion force of the battery cells 21, ensuring that multiple restraints 31 remain connected. The restraints 31 provide good restraint for the battery cell group 20, maintaining the structural integrity of the battery device 100 and improving its safety and reliability. Furthermore, during maintenance of the battery device 100, the expansion and deformation of the battery cells 21 reduces the gap between adjacent battery cell groups 20. The flexible connector 32 absorbs the tensile force of the restraints 31, allowing them to move between adjacent battery cell groups 20, facilitating reliable and non-destructive assembly and disassembly of the restraint assembly 30 within narrow gaps.

[0102] According to some embodiments of this application, the flexible connector 32 is disposed around the outside of the first wall 311 and the second wall 312.

[0103] The flexible connector 32 being arranged around the outside of the first wall 311 and the second wall 312 means that the flexible connector 32 is arranged around the outside of both the first wall 311 and the second wall 312, and the flexible connector 32 is provided between the first wall 311 and the second wall 312. For example, the flexible connector 32 is in the shape of an 8; or, the flexible connector 32 is arranged around the outside of the structure formed by the first wall 311 and the second wall 312, that is, there is no flexible connector 32 between the first wall 311 and the second wall 312.

[0104] In the above scheme, the flexible connector 32 is wrapped around the outside of the first wall 311 and the second wall 312, so that there is a large connection area between the flexible connector 32 and the first wall 311 and the second wall 312, which makes the connection between the flexible connector 32 and the first wall 311 and the second wall 312 more reliable. It is convenient for the flexible connector 32 to absorb the tensile stress applied to the first wall 311 and the second wall 312 due to the expansion and deformation of the battery cell 21, so that the first wall 311 and the second wall 312 can maintain the connection state and reduce the risk of tearing of the first wall 311 and the second wall 312.

[0105] Please refer to Figure 6 , Figure 6 This is a schematic diagram illustrating the assembly of a flexible connector with a first wall and a second wall according to some embodiments of this application. According to some embodiments of this application, the flexible connector 32 has a first constraint space 32a, through which both the first wall 311 and the second wall 312 pass.

[0106] The first constraint space 32a is a space for the passage of the first wall 311 and the second wall 312. It can be understood that a part of the first wall 311 and the second wall 312 are accommodated in the first constraint space 32a, and the flexible connector 32 encloses the structure formed by the first wall 311 and the second wall 312.

[0107] In the above scheme, by having the first wall 311 and the second wall 312 both pass through the first constraint space 32a, the flexible connector 32 wraps around the structure formed by the first wall 311 and the second wall 312. The flexible connector 32 has a good constraint effect on the first wall 311 and the second wall 312, and is convenient to absorb the tensile stress transmitted to the first wall 311 and the second wall 312 by the expansion of the battery cell 21.

[0108] Please refer to Figure 7 , Figure 7 This is a schematic diagram illustrating the assembly of the flexible connector with the first wall and the second wall according to some embodiments of this application. According to some embodiments of this application, the flexible connector 32 includes a first portion 321, a second portion 322, and a third portion 323. The first portion 321 is disposed around the outside of the first wall 311 and the second wall 312. Both ends of the first portion 321 are connected to the second portion 322 and the third portion 323, respectively. The second portion 322 and the third portion 323 are stacked and connected, such that the first portion 321, the second portion 322, and the third portion 323 enclose a first constraint space 32a.

[0109] In the unfolded state of the flexible connector 32, the second part 322, the first part 321, and the third part 323 are sequentially distributed along the extension direction of the flexible connector 32. When the flexible connector 32 connects two adjacent restraint members 31, the first part 321 is wrapped around the outside of the first wall 311 and the second wall 312, and its two ends are connected to the second part 322 and the third part 323, respectively. The second part 322 and the third part 323 are stacked and connected, thereby constraining the first wall 311 and the second wall 312 within the first constraint space 32a. The first part 321 can be a U-shaped structure with one end open, and the second part 322 and the second part 322 close the opening of the U-shaped structure, so that the first part 321, the second part 322, and the third part 323 enclose the first constraint space 32a.

[0110] In the above scheme, the first part 321 is disposed around the outside of the first wall 311 and the second wall 312. The two ends of the first part 321 are connected to the second part 322 and the third part 323 respectively. The second part 322 and the third part 323 are stacked and connected, and the first part 321, the second part 322 and the third part 323 together form a first constraint space 32a that surrounds the first wall 311 and the second wall 312. This facilitates the assembly of the flexible connector 32 with the first wall 311 and the second wall 312. Furthermore, the second part 322 and the third part 323 have high connection reliability, so that the flexible connector 32 has a good constraint effect on the first wall 311 and the second wall 312.

[0111] According to some embodiments of this application, please refer to Figure 7 On the same projection plane perpendicular to the first direction X, the orthographic projections of the second part 322 and the third part 323 do not overlap with the orthographic projection of the first wall 311, and the orthographic projections of the second part 322 and the third part 323 do not overlap with the orthographic projection of the second wall 312.

[0112] With the first direction X as the projection direction, the orthographic projections of the second part 322 and the third part 323 do not overlap with the orthographic projection of the first wall 311, and the orthographic projections of the second part 322 and the third part 323 do not overlap with the orthographic projection of the second wall 312, so that the second part 322 and the third part 323 are not located between the first wall 311 and the battery cell group 20, and are not located between the second wall 312 and the battery cell group 20.

[0113] During the assembly of the restraint assembly 30 and the battery cell assembly 20, the second part 322 and the third part 323 can be located on the side of the first part 321 along the third direction Z. The restraint assembly 30 can move along the third direction Z to be fitted onto the outside of the battery cell assembly 20. The third direction Z, the second direction Y and the first direction X are perpendicular to each other.

[0114] In the above scheme, the orthographic projection of the second part 322 and the orthographic projection of the third part 323 do not overlap with the orthographic projection of the first wall 311, which facilitates the assembly of the binding component 30 and the battery cell group 20. Furthermore, the second part 322 and the third part 323 do not occupy the space between the battery cell group 20 and the first wall 311 or the second wall 312, which is beneficial for the expansion and deformation of the battery cell 21.

[0115] According to some embodiments of this application, please refer to Figure 7 The second part 322 and the third part 323 are located on the same side of the first wall 311 and the second wall 312 along the third direction Z, and the third direction Z, the second direction Y and the first direction X are perpendicular to each other.

[0116] The second part 322 and the third part 323 are located on the same side of the first wall 311 and the second wall 312 along the third direction Z. During the assembly of the restraint assembly 30 and the battery cell group 20, the first part 321 can be inserted between two adjacent battery cell groups 20 first, and then the second part 322 and the third part 323 can be inserted between two adjacent battery cell groups 20 without having to consider the possibility of damage to the connection between the second part 322 and the third part 323 when they are inserted between two adjacent battery cell groups 20.

[0117] In the above scheme, the second part 322 and the third part 323 are located on the same side of the first wall 311 and the second wall 312 along the third direction Z. When assembling the restraint assembly 30 with the multiple battery cell groups 20, it can be fitted from the side of the first wall 311 and the second wall 312 where the second part 322 and the third part 323 are not provided towards the multiple battery cell groups 20, thereby reducing the risk of damage to the connection area of ​​the second part 322 and the third part 323, which is conducive to maintaining the integrity of the flexible connector 32 and reducing the risk of damage to the flexible connector 32 during the assembly of the restraint assembly 30 with the multiple battery cell groups 20, so that the restraint assembly 30 has a better restraint effect on the multiple battery cell groups 20.

[0118] According to some embodiments of this application, the second part 322 and the third part 323 have an overlapping region 324, the overlapping region 324 having a dimension greater than or equal to 10 mm in its width direction; the width direction of the overlapping region 324 is perpendicular to the length direction of the first wall 311.

[0119] The dimensions of the overlapping region 324 in its width direction can be measured using tools such as a CCD camera and a micrometer. For ease of description, Figure 7 The dimension indicated by W1 is the dimension of the overlapping region 324 in its width direction.

[0120] The overlapping region 324 can be regarded as the connection region between the second part 322 and the third part 323. The second part 322 and the third part 323 are connected in the overlapping region 324. Therefore, the size of the overlapping region 324 affects the reliability of the connection between the second part 322 and the third part 323.

[0121] In some embodiments, the width direction of the overlapping region 324 may be parallel to the third direction Z.

[0122] If the overlapping area 324 is too small in its width direction (e.g., less than 10 mm), the connection area between the second part 322 and the third part 323 will be small, affecting the connection reliability between the second part 322 and the third part 323.

[0123] In the above scheme, the overlapping area 324 is the connection area between the second part 322 and the third part 323. The dimension of the overlapping area 324 in its width direction is greater than or equal to 10mm, so that the second part 322 and the third part 323 have a large connection area, which makes the flexible connector 32 have high overall reliability. It is easy for the flexible connector 32 to absorb the tensile stress of the first wall 311 and the second wall 312 through elastic deformation, reducing the risk of the flexible connector 32 being pulled and damaged.

[0124] According to some embodiments of this application, the first part 321, the second part 322 and the third part 323 are integrally formed.

[0125] The first part 321, the second part 322, and the third part 323 can be three connected parts of an integral sheet. For example, the second part 322, the first part 321, and the third part 323 are distributed sequentially along the length of the sheet. After the sheet wraps around the first wall 311 and the second wall 312, the two ends of the sheet are connected. The area that wraps around the first wall 311 and the second wall 312 is the first part 321, and the two ends of the sheet are formed as the second part 322 and the third part 323.

[0126] In the above scheme, the first part 321, the second part 322 and the third part 323 can be provided by a sheet material and the two ends of the sheet material are connected. The structure is simple and the flexible connector 32 has high overall reliability. It is easy for the flexible connector 32 to absorb the tensile stress of the first wall 311 and the second wall 312 through elastic deformation, thereby reducing the risk of the flexible connector 32 being damaged by pulling.

[0127] According to some embodiments of this application, the thickness of the flexible connector 32 is 0.07 mm to 0.09 mm.

[0128] The thickness of the flexible connector 32 can be obtained by measuring with a micrometer. For ease of description, Figure 7The dimension indicated by H1 is the thickness of the flexible connector 32.

[0129] In some embodiments, the thickness of the flexible connector 32 may be, but is not limited to, any one or any two of 0.070 mm, 0.072 mm, 0.075 mm, 0.078 mm, 0.080 mm, 0.082 mm, 0.085 mm, 0.088 mm, and 0.090 mm.

[0130] If the thickness of the flexible connector 32 is too thin (e.g., less than 0.07 mm), the overall strength of the flexible connector 32 will be low, and the flexible connector 32 will be easily torn; if the thickness of the flexible connector 32 is too thick, the flexible connector 32 will occupy a large assembly space, wasting space.

[0131] In the above scheme, the thickness of the flexible connector 32 is greater than or equal to 0.07 mm, which makes the flexible connector 32 have high overall strength and reduces the risk of the flexible connector 32 being damaged by pulling; the thickness of the flexible connector 32 is less than or equal to 0.09 mm, which makes the flexible connector 32 occupy less assembly space, reduces space waste, and makes the battery device 100 have high energy density.

[0132] According to some embodiments of this application, the flexible connector 32 includes a polyimide film, a cloth tape, or a polytetrafluoroethylene film.

[0133] In the above solutions, polyimide film, cloth tape or polytetrafluoroethylene film all have good insulation effect, which helps to reduce the risk of short circuit between positive and negative electrodes.

[0134] According to some embodiments of this application, please refer to Figure 4 The adjacent first wall 311 and second wall 312 are connected by a plurality of flexible connectors 32, which are spaced apart along the length of the first wall 311.

[0135] When connecting adjacent first walls 311 and second walls 312, multiple flexible connectors 32 are provided at intervals along the first direction X, and the multiple flexible connectors 32 jointly connect adjacent first walls 311 and second walls 312.

[0136] In some embodiments, the length direction of the first wall 311 is parallel to the second direction Y.

[0137] In the above scheme, multiple flexible connectors 32 are spaced apart along the length direction of the first wall 311, which can connect the first wall 311 and the second wall 312 at multiple positions along the length direction of the first wall 311. This facilitates the restraint of the first wall 311 and the second wall 312, reduces the risk of the first wall 311 and the second wall 312 becoming disconnected, and keeps the multiple restraints 31 connected.

[0138] According to some embodiments of this application, please refer to Figure 3 The first wall 311 includes a first end 311a and a second end 311b disposed opposite to each other along the second direction Y; a plurality of flexible connectors 32 are spaced apart along the second direction Y, and the plurality of flexible connectors 32 include a first end connector 325 and a second end connector 326, the first end connector 325 is disposed at the first end 311a, and the second end connector 326 is disposed at the second end 311b; in each battery cell group 20, along the second direction Y, the two battery cells 21 that are farthest apart among the plurality of battery cells 21 are the first end battery cell 21a and the second end battery cell 21b, respectively; on the same projection plane perpendicular to the first direction X, the orthographic projection of the first end battery cell 21a falls into the orthographic projection of the first end connector 325, and the orthographic projection of the second end battery cell 21b falls into the orthographic projection of the second end connector 326.

[0139] The first end 311a and the second end 311b are the two opposite ends of the first wall 311 along the second direction Y, or they can be understood as the two ends of the first wall 311 along its length direction.

[0140] The first end connector 325 and the second end connector 326 are two flexible connectors 32 distributed at both ends in the second direction Y among a plurality of flexible connectors 32.

[0141] In the battery cell group 20, the first end battery cell 21a and the second end battery cell 21b are distributed at both ends of the plurality of battery cells 21 along the second direction Y.

[0142] With the first direction X as the projection direction, the orthographic projection of the first end battery cell 21a falls into the orthographic projection of the first end connector 325, and the orthographic projection of the second end battery cell 21b falls into the orthographic projection of the second end connector 326, so that the first end connector 325 is correspondingly set with the first end battery cell 21a, and the second end connector 326 is correspondingly set with the second end battery cell 21b.

[0143] In the battery cell group of 20, due to the restraint of the restraint member 31 and the constraint of the adjacent battery cell 21, the first end battery cell 21a and the second end battery cell 21b expand and deform in the first direction X, resulting in a large expansion stress on the first end 311a and the second end 311b of the first wall 311.

[0144] In the above scheme, the first end battery cell 21a and the second end battery cell 21b are distributed at both ends of the plurality of battery cells 21 in the second direction Y. During the charging and discharging process of the battery device 100, the expansion stress of the first end battery cell 21a and the second end battery cell 21b in the first direction X is large. The first end connector 325 is correspondingly arranged with the first end battery cell 21a and the second end connector 326 is correspondingly arranged with the second end battery cell 21b, which can absorb the expansion stress of the first end battery cell 21a and the second end battery cell 21b, so that the adjacent first wall 311 and second wall 312 remain connected.

[0145] According to some embodiments of this application, please refer to Figure 5 The restraint member 31 is a metal part, and each restraint member 31 is provided with an insulating member 33. The insulating member 33 at least covers the surface of the first wall 311 facing the second wall 312 and the surface of the second wall 312 facing the first wall 311.

[0146] In some embodiments, the restraint member 31 can be a steel strip, and the restraint member 31 has high strength and is not easily pulled or damaged.

[0147] In some embodiments, the insulating member 33 may be an insulating layer coated on the surface of the restraining member 31, or the insulating member 33 may be an insulating adhesive paper disposed on the surface of the restraining member 31, or the insulating member 33 may be an insulating sleeve disposed on the surface of the restraining member 31.

[0148] In the above solution, by covering at least the surface of the first wall 311 facing the second wall 312 and the surface of the second wall 312 facing the first wall 311 with the insulating member 33, an insulating barrier can be formed between the restraint member 31 and the battery cell assembly 20, thereby reducing the risk of short circuit between the positive and negative electrodes.

[0149] Please refer to Figure 5 and further refer to Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of the assembly of the first insulating part and the first wall provided in some embodiments of this application. Figure 9 This is a schematic diagram illustrating the assembly of the second insulating portion and the second wall according to some embodiments of this application. According to some embodiments of this application, the insulating member 33 includes a first insulating portion 331 and a second insulating portion 332, both of which are tubular. A first wall 311 passes through the first insulating portion 331, and a second wall 312 passes through the second insulating portion 332. A flexible connector 32 is wound around adjacent first walls 311 and second walls 312.

[0150] The first insulating part 331 and the second insulating part 332 can be insulating sleeves, with the first insulating part 331 at least sleeved on the first wall 311 and the second insulating part 332 at least sleeved on the second wall 312.

[0151] When the flexible connector 32 connects the adjacent first wall 311 and second wall 312, the first wall 311 is fitted with a first insulating part 331, and the second wall 312 is fitted with a second insulating part 332. The flexible connector 32 is wound around the first insulating part 331 and the second insulating part 332 to connect the first insulating part 331, the first wall 311, the second insulating part 332 and the second wall 312 into one unit.

[0152] In the above scheme, both the first insulating part 331 and the second insulating part 332 are tubular, which facilitates the assembly of the first wall 311 with the first insulating part 331 and the second wall 312 with the second insulating part 332; the flexible connector 32 is wound around the adjacent first insulating part 331 and second insulating part 332, so that when the flexible connector 32 is connected to the first wall 311 and the second wall 312, it can constrain the first insulating part 331 and the second insulating part 332, reducing the risk of displacement of the first insulating part 331 and the second insulating part 332.

[0153] Please refer to Figure 5 and further refer to Figures 10 to 13 , Figure 10 for Figure 5 A magnified view of part A. Figure 11 for Figure 5 A magnified view of part B. Figure 12 for Figure 5 A magnified view of part C. Figure 13 for Figure 5 A partial enlarged view at point D. According to some embodiments of this application, the restraint member 31 further includes a third wall 313, a fourth wall 314, a first transition wall 315, a second transition wall 316, a third transition wall 317, and a fourth transition wall 318. The third wall 313 and the fourth wall 314 are arranged opposite each other along the second direction Y. The first wall 311 is connected to the third wall 313 through the first transition wall 315, the first wall 311 is connected to the fourth wall 314 through the second transition wall 316, the second wall 312 is connected to the third wall 313 through the third transition wall 317, and the second wall 312 is connected to the fourth wall 314 through the fourth transition wall 318. The first transition wall 315 and the second transition wall 316 are both disposed through the first insulating portion 331, and the third transition wall 317 and the fourth transition wall 318 are both disposed through the second insulating portion 332.

[0154] In some embodiments, the length of the third wall 313 along the first direction X may be less than the length of the first wall 311 along the second direction Y, and the length of the third wall 313 along the first direction X may be less than the length of the second wall 312 along the second direction Y; the length of the fourth wall 314 along the first direction X may be less than the length of the first wall 311 along the second direction Y, and the length of the fourth wall 314 along the first direction X may be less than the length of the second wall 312 along the second direction Y.

[0155] The first wall 311, the first transition wall 315, the third wall 313, the third transition wall 317, the second wall 312, the fourth transition wall 318, the fourth wall 314 and the second transition wall 316 form a ring structure.

[0156] The first insulating portion 331 extends from the first wall 311 to the first transition wall 315 and the second transition wall 316. The first insulating portion 331 has a large length in the circumferential direction of the restraint member 31 and a large coverage area in the circumferential direction of the restraint member 31. The first insulating portion 331 can provide a large area of ​​insulating protective layer on the surface of the restraint member 31.

[0157] The second insulating portion 332 extends from the second wall 312 to the third transition wall 317 and the fourth transition wall 318. The second insulating portion 332 has a large length in the circumferential direction of the restraint member 31 and a large coverage area in the circumferential direction of the restraint member 31. The second insulating portion 332 can provide a large area of ​​insulating protective layer on the surface of the restraint member 31.

[0158] In some embodiments, the first transition wall 315, the second transition wall 316, the third transition wall 317 and the fourth transition wall 318 can be arc-shaped walls, and the restraint member 31 can be bent to reduce manufacturing difficulty.

[0159] In the above scheme, the first insulating part 331 extends to the first transition wall 315 and the second transition wall 316, and the second insulating part 332 extends to the third transition wall 317 and the fourth transition wall 318, so that the first insulating part 331 and the second insulating part 332 have a better insulation effect on both sides of the battery cell group 20 along the second direction Y, which can reduce the risk of short circuit between the restraint member 31 and the battery cell group 20.

[0160] According to some embodiments of this application, the first insulating part 331 and the second insulating part 332 are separately provided.

[0161] The first insulating part 331 and the second insulating part 332 are two independent components, and the first insulating part 331 and the second insulating part 332 can be manufactured separately.

[0162] In the above scheme, the first insulating part 331 and the second insulating part 332 are separately provided, which can independently process and manufacture the first insulating part 331 and the second insulating part 332, improve processing and manufacturing efficiency, and facilitate the assembly of the first insulating part 331 and the first wall 311, and the assembly of the second insulating part 332 and the second wall 312.

[0163] According to some embodiments of this application, please refer to Figure 5 Along the circumference of the restraint member 31, the first insulating part 331 and the second insulating part 332 are circumferentially spaced apart, at least a portion of the third wall 313 is exposed between the first insulating part 331 and the second insulating part 332, and at least a portion of the fourth wall 314 is exposed between the first insulating part 331 and the second insulating part 332.

[0164] The lengths of the first insulating portion 331 and the second insulating portion 332 along the circumference of the binding member 31 are less than the circumference of the binding member 31. Along the circumference of the binding member 31, the coverage length of the first insulating portion 331 on the third wall 313 and the coverage length of the second insulating portion 332 on the third wall 313 are less than the length of the third wall 313, and the coverage length of the first insulating portion 331 on the fourth wall 314 and the coverage length of the second insulating portion 332 on the fourth wall 314 are less than the length of the fourth wall 314, such that at least a portion of the third wall 313 is exposed between the first insulating portion 331 and the second insulating portion 332, and at least a portion of the fourth wall 314 is exposed between the first insulating portion 331 and the second insulating portion 332.

[0165] In the above scheme, the first insulating part 331 and the second insulating part 332 are arranged at intervals along the circumference of the binding member 31, and at least a portion of the third wall 313 is not covered by the first insulating part 331 and the second insulating part 332, and at least a portion of the fourth wall 314 is not covered by the first insulating part 331 and the second insulating part 332, so that the length of the first insulating part 331 and the second insulating part 332 can be set to be shorter, reducing material waste.

[0166] Please refer to Figure 3 and further refer to Figure 14 and Figure 15 , Figure 14 This is a schematic diagram illustrating the assembly of the first insulating part and the second insulating part with the first end plate, provided in some embodiments of this application. Figure 15This is a schematic diagram illustrating the assembly of the first insulating portion and the second insulating portion with the second end plate according to some embodiments of this application. According to some embodiments of this application, each battery cell group 20 further includes a first end plate 22 and a second end plate 23 disposed opposite each other along a second direction Y. In each battery cell group 20, along the second direction Y, all battery cells 21 are located between the first end plate 22 and the second end plate 23. On the same projection plane perpendicular to the second direction Y, the orthographic projection of the first insulating portion 331 at least partially overlaps with the orthographic projection of the first end plate 22, the orthographic projection of the second insulating portion 332 at least partially overlaps with the orthographic projection of the first end plate 22, the orthographic projection of the first insulating portion 331 at least partially overlaps with the orthographic projection of the second end plate 23, and the orthographic projection of the second insulating portion 332 at least partially overlaps with the orthographic projection of the second end plate 23.

[0167] The first end plate 22 and the second end plate 23 are components disposed on both sides of the plurality of battery cells 21 along the second direction Y. The first end plate 22 and the second end plate 23 can constrain the plurality of battery cells 21 on both sides along the second direction Y, and can constrain the expansion and deformation of the plurality of battery cells 21 along the second direction Y.

[0168] In each battery cell group 20, along the second direction Y, the two battery cells 21 that are furthest apart are the first end battery cell 21a and the second end battery cell 21b, respectively. The first end plate 22 is correspondingly arranged with the first end battery cell 21a, and the second end plate 23 is correspondingly arranged with the second end battery cell 21b. An insulating structure may be provided between the first end plate 22 and the first end battery cell 21a, and an insulating structure may be provided between the second end plate 23 and the second end battery cell 21b, so that the first end plate 22 is insulated from the first end battery cell 21a, and the second end plate 23 is insulated from the second end battery cell 21b.

[0169] With the second direction Y as the projection direction, the orthographic projection of the first insulating part 331 at least partially overlaps with the orthographic projection of the first end plate 22, and the orthographic projection of the second insulating part 332 at least partially overlaps with the orthographic projection of the first end plate 22. The first insulating part 331 and the second insulating part 332 respectively partially overlap with the first end plate 22. At the same time, the orthographic projection of the first insulating part 331 at least partially overlaps with the orthographic projection of the second end plate 23, and the orthographic projection of the second insulating part 332 at least partially overlaps with the orthographic projection of the second end plate 23. The first insulating part 331 and the second insulating part 332 respectively partially overlap with the second end plate 23.

[0170] In the above scheme, the first end plate 22 and the second end plate 23 are respectively located on both sides of the plurality of battery cells 21 along the second direction Y. The restraining member 31 cooperates with the first end plate 22 and the second end plate 23 to constrain the expansion deformation of the plurality of battery cells 21. The first end plate 22 is insulated from the first end battery cell 21a, and the second end plate 23 is insulated from the second end battery cell 21b. With the second direction Y as the projection direction, the orthographic projection of the first insulating part 331 and the orthographic projection of the second insulating part 332 at least partially overlap with the orthographic projection of the first end plate 22, and the orthographic projection of the first insulating part 331 and the orthographic projection of the second insulating part 332 at least partially overlap with the orthographic projection of the second end plate 23, which can reduce the risk of short circuit between the restraining member 31 and the battery cell 21.

[0171] According to some embodiments of this application, both the first insulating part 331 and the second insulating part 332 are insulating heat shrink tubing.

[0172] In the above scheme, the first insulating part 331 and the second insulating part 332 are both insulating heat shrink tubing sleeves, which can shrink after heating (such as heating to 100℃~125℃) to fit with the restraint member 31, so that the first insulating part 331 and the restraint member 31, as well as the second insulating part 332 and the restraint member 31, have good connection reliability.

[0173] According to some embodiments of this application, the thickness of the first insulating portion 331 is 0.05mm to 0.15mm; and / or, the thickness of the second insulating portion 332 is 0.05mm to 0.15mm.

[0174] The thickness of the first insulating part 331 can be obtained by measuring with a micrometer. For ease of description, Figure 8 The dimension indicated by H2 is the thickness of the first insulating part 331.

[0175] In some embodiments, the thickness of the first insulating portion 331 may be, but is not limited to, any one or any two of 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, and 0.15 mm.

[0176] If the thickness of the first insulating part 331 is too thin (e.g., less than 0.05 mm), the insulation effect of the first insulating part 331 is poor, and the first insulating part 331 is easily scratched and damaged; if the thickness of the first insulating part 331 is too thick (e.g., greater than 0.15 mm), the first insulating part 331 occupies a large assembly space.

[0177] By making the thickness of the first insulating part 331 greater than or equal to 0.05 mm, the first insulating part 331 has a better insulation effect; by making the thickness of the first insulating part 331 less than or equal to 0.15 mm, the first insulating part 33 occupies a smaller assembly space.

[0178] The thickness of the second insulating part 332 can be obtained by measuring with a micrometer. For ease of description, Figure 8 The dimension indicated by H3 is the thickness of the second insulating part 332.

[0179] In some embodiments, the thickness of the second insulating portion 332 may be, but is not limited to, any one or any two of 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, and 0.15 mm.

[0180] If the thickness of the second insulating part 332 is too thin (e.g., less than 0.05 mm), the insulation effect of the second insulating part 332 will be poor, and the second insulating part 332 will be easily scratched and damaged; if the thickness of the second insulating part 332 is too thick (e.g., greater than 0.15 mm), the first insulating part 331 will occupy a large assembly space.

[0181] By making the thickness of the second insulating part 332 greater than or equal to 0.05 mm, the second insulating part 332 has a better insulation effect; by making the thickness of the second insulating part 332 less than or equal to 0.15 mm, the second insulating part 33 occupies a smaller assembly space.

[0182] According to some embodiments of this application, the insulating member 33 is a tubular structure, and the binding member 31 is integrally inserted through the insulating member 33.

[0183] When the battery cell pack 20 is not equipped with end plates, the end battery cells 21 at both ends of the battery cell pack 20 are constrained by the restraint member 31 and the insulator 33. The insulator 33 is a tubular structure, which isolates the restraint member 31 from the end battery cells 21 through the insulator 33, thereby reducing the risk of short circuit between the restraint member 31 and the end battery cells 21.

[0184] The insulating member 33 is an integral structure, and the two ends of the insulating member 33 can be connected, so that the entire surface of the restraint member 31 is wrapped by the insulating member 33.

[0185] In the above solution, by having the restraint member 31 pass through the insulating member 33, the insulating member 33 forms an insulating protective layer on the surface of the restraint member 31, thereby reducing the risk of short circuit between the restraint member 31 and the battery cell 21.

[0186] According to some embodiments of this application, the material of the insulating element 33 includes polyethylene terephthalate or polyvinyl chloride.

[0187] In the above scheme, polyethylene terephthalate or polyvinyl chloride both have good insulation and protection effects, and can shrink after heating, which makes it easy to form an insulating and protective layer on the surface of the restraint 31.

[0188] According to some embodiments of this application, the surface roughness of the insulating member 33 is greater than that of the flexible connector 32.

[0189] The surface roughness of the insulating component 33 and the surface roughness of the flexible connector 32 can be the arithmetic mean deviation of the profile Ra.

[0190] In the above scheme, compared with the insulating component 33, the flexible connector 32 is smoother, which can reduce the assembly difficulty of the binding component 30 and the battery cell group 20 and facilitate the improvement of assembly efficiency.

[0191] According to some embodiments of this application, the ratio of the surface roughness of the insulating member 33 to the surface roughness of the flexible connector 32 is 10 to 100.

[0192] The test method for surface roughness can refer to the national standard GB / T 1031-2009.

[0193] In some embodiments, the ratio of the surface roughness of the insulating member 33 to the surface roughness of the flexible connector 32 can be, but is not limited to, any one or any two of 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.

[0194] In the above scheme, the surface roughness of the insulating component 33 is significantly different from that of the flexible connector 32. The flexible connector 32 has a high surface smoothness, which helps to reduce the friction between the flexible connector 32 and the battery cell group 20, and facilitates the rapid assembly of the binding component 30 and the battery cell group 20.

[0195] Please refer to Figure 8 and Figure 9According to some embodiments of this application, the first wall 311 includes a plurality of first side surfaces 311c. When viewed along the length of the first wall 311, the plurality of first side surfaces 311c are arranged circumferentially along the first wall 311. Two adjacent first side surfaces 311c are connected by a first arc surface 311d, the radius of which is 10μm to 50μm. And / or, the second wall 312 includes a plurality of second side surfaces 312a. When viewed along the length of the second wall 312, the plurality of second side surfaces 312a are arranged circumferentially along the second wall 312. Two adjacent second side surfaces 312a are connected by a second arc surface 312b, the radius of which is 10μm to 50μm.

[0196] The radius of the first arc surface 311d and the radius of the second arc surface 312b can be measured by a profile measuring instrument, a roundness measuring instrument, a coordinate measuring machine, etc.

[0197] The circumferential direction of the first wall 311 can be understood as the circumferential direction of the cross section of the first wall 311 on the cross section perpendicular to the length direction of the first wall 311.

[0198] Multiple first side surfaces 311c are arranged circumferentially along the first wall 311, and two adjacent first side surfaces 311c are connected by a first arc surface 311d. The first arc surface 311d is the connecting surface of two adjacent first side surfaces 311c. The first arc surface 311d is used to achieve a smooth transition between two adjacent first side surfaces 311c, reducing the risk of scratching and damaging the battery cell 21 at the intersection of two adjacent first side surfaces 311c.

[0199] Compared to a regular chamfer, the radius of the first arc surface 311d is larger. It can be understood that the first arc surface 311d is an arc surface that smoothly transitions the two adjacent first side surfaces 311c during the processing of the restraint part 31.

[0200] In some embodiments, the radius of the first arc surface 311d can be, but is not limited to, any one or any two of 10μm, 12μm, 15μm, 18μm, 20μm, 22μm, 25μm, 28μm, 30μm, 32μm, 35μm, 38μm, 40μm, 42μm, 45μm, 48μm, and 50μm.

[0201] The two adjacent first sides 311c are connected by the first arc surface 311d, and the radius of the first arc surface 311d is 10μm~50μm, so that the two adjacent first sides 311c are smoothly transitioned, reducing the risk of the restraint member 31 scratching the flexible connector 32 or the insulating member 33, and making the flexible connector 32 or the insulating member 33 have a longer service life.

[0202] The circumferential direction of the second wall 312 can be understood as the circumferential direction of the cross section of the second wall 312 on the cross section perpendicular to the length direction of the second wall 312.

[0203] Multiple second side surfaces 312a are arranged circumferentially along the second wall 312, and two adjacent second side surfaces 312a are connected by a second arc surface 312b. The second arc surface 312b is the connecting surface of two adjacent second side surfaces 312a. The second arc surface 312b is used to achieve a smooth transition between two adjacent second side surfaces 312a, reducing the risk of scratching and damaging the battery cell 21 at the intersection of two adjacent second side surfaces 312a.

[0204] Compared to a regular chamfer, the radius of the second arc surface 312b is larger. It can be understood that the second arc surface 312b is an arc surface that smoothly transitions the two adjacent second side surfaces 312a during the processing of the restraint part 31.

[0205] In some embodiments, the radius of the second arc surface 312b can be, but is not limited to, any one or any two of 10μm, 12μm, 15μm, 18μm, 20μm, 22μm, 25μm, 28μm, 30μm, 32μm, 35μm, 38μm, 40μm, 42μm, 45μm, 48μm, and 50μm.

[0206] Two adjacent second sides 312a are connected by a second arc surface 312b, and the radius of the second arc surface 312b is 10μm~50μm, so that the two adjacent second sides 312a are smoothly transitioned, reducing the risk of the restraint member 31 scraping the flexible connector 32 or the insulating member 33, and making the flexible connector 32 or the insulating member 33 have a longer service life.

[0207] In some embodiments, on a cross section perpendicular to the extending direction of the restraint member 31, adjacent two side surfaces of the restraint member 31 are connected by an arc surface in the circumferential direction of the cross section, and the radius of the arc surface can be 10μm to 50μm. That is, adjacent two side surfaces of the restraint member 31 are connected by an arc surface.

[0208] According to some embodiments of this application, this application also provides an electrical device that includes a battery device 100 as described above, the battery device 100 being used to provide electrical energy.

[0209] According to some embodiments of this application, this application also provides a restraint assembly 30, which includes a plurality of restraint members 31 and a flexible connector 32; the plurality of restraint members 31 are arranged along a first direction X, the restraint members 31 are ring-shaped, and along the first direction X, the restraint members 31 include a first wall 311 and a second wall 312 disposed opposite to each other, in two adjacent restraint members 31, the first wall 311 of one is disposed adjacent to the second wall 312 of the other, and the first direction X is perpendicular to the length direction of the first wall 311; the flexible connector 32 connects the adjacent first wall 311 and second wall 312.

[0210] According to the embodiment of this application, the restraint assembly 30 has multiple restraint members 31 connected together by flexible connectors 32, which has high overall integrity and facilitates mutual restraint of the multiple restraint members 31. Since adjacent restraint members 31 are connected by flexible connectors 32, the flexible connectors 32 can undergo flexible deformation to absorb the tensile stress of the restraint members 31. When the restraint assembly 30 is assembled with multiple battery cell groups 20, when the expansion degree of different battery cell groups 20 is inconsistent, the restraint members 31 are connected by the flexible connectors 32 with extensibility, allowing a certain degree of relative displacement and stress release. This transforms the concentrated tensile stress that originally acted on the rigid restraint members 31 and may have caused the restraint members 31 to break into dispersed stress that can be absorbed and buffered by the flexible connectors 32, reducing the risk of the restraint members 31 breaking. At the same time, the flexible connectors 32 absorb the expansion force of the battery cells 21, so that the multiple restraint members 31 are still connected. The restraint members 31 have a good restraining effect on the battery cell groups 20, and the battery device 100 maintains good structural integrity, which can improve the safety and reliability of the battery device 100.

[0211] According to some embodiments of this application, please refer to Figures 3 to 15 This application provides a battery device 100, which includes a plurality of battery cell groups 20 and a restraining assembly 30. The plurality of battery cell groups 20 are spaced apart along a first direction X, and each battery cell group 20 includes a plurality of battery cells 21 arranged along a second direction Y. The restraining assembly 30 includes a plurality of restraining members 31 and flexible connectors 32. The plurality of restraining members 31 are arranged along the first direction X, and the restraining members 31 have a ring structure. Each restraining member 31 is sleeved on the outside of a battery cell group 20.

[0212] Along the first direction X, the restraint member 31 includes a first wall 311 and a second wall 312 disposed opposite to each other. In two adjacent restraint members 31, the first wall 311 of one is disposed adjacent to the second wall 312 of the other. The restraint member 31 also includes a third wall 313, a fourth wall 314, a first transition wall 315, a second transition wall 316, a third transition wall 317, and a fourth transition wall 318. The third wall 313 and the fourth wall 314 are disposed opposite to each other along the second direction Y. The first wall 311 and the third wall 313 are connected through the first transition wall 315. The first wall 311 and the fourth wall 314 are connected through the second transition wall 316. The second wall 312 and the third wall 313 are connected through the third transition wall 317. The second wall 312 and the fourth wall 314 are connected through the fourth transition wall 318.

[0213] The flexible connector 32 is located between two adjacent battery cell groups 20, and connects adjacent first walls 311 and second walls 312. The flexible connector 32 includes a first part 321, a second part 322, and a third part 323. The first part 321 is wrapped around the outside of the first wall 311 and the second wall 312, and its two ends are connected to the second part 322 and the third part 323, respectively. The second part 322 and the third part 323 are stacked and connected so that the first part 321, the second part 322, and the third part 323 enclose a first constraint space 32a. The first wall 311 and the second wall 312 both pass through the first constraint space 32a. The second part 322 and the third part 323 are located on the same side of the first wall 311 and the second wall 312 along the third direction Z. The flexible connector 32 can be a polyimide film with a thickness of 0.08 mm. The polyimide film has good insulation properties, which helps reduce the risk of short circuits between the positive and negative electrodes. At the same time, the polyimide film has high surface smoothness, which facilitates the assembly of the binding component 30 and the battery cell group 20. The flexible connector 32 has a thickness of 0.08 mm, has high overall strength, and occupies less assembly space. This reduces the risk of the flexible connector 32 being damaged by pulling and makes the battery device 100 have a high energy density.

[0214] Each restraint member 31 is provided with an insulating member 33, which includes a first insulating portion 331 and a second insulating portion 332. Both the first insulating portion 331 and the second insulating portion 332 are tubular. A first wall 311 passes through the first insulating portion 331, and a second wall 312 passes through the second insulating portion 332. A flexible connector 32 is wound around adjacent first walls 311 and second walls 312. A first transition wall 315 and a second transition wall 316 both pass through the first insulating portion 331, and a third transition wall 317 and a fourth transition wall 318 both pass through the second insulating portion 332. The first insulating portion 331 and the second insulating portion 332 are circumferentially spaced along the circumference of the restraint member 31. At least a portion of the third wall 313 is exposed between the first insulating portion 331 and the second insulating portion 332, and at least a portion of the fourth wall 314 is exposed between the first insulating portion 331 and the second insulating portion 332.

[0215] Each battery cell group 20 also includes a first end plate 22 and a second end plate 23 disposed opposite to each other along the second direction Y. In each battery cell group 20, along the second direction Y, all battery cells 21 are located between the first end plate 22 and the second end plate 23. On the same projection plane perpendicular to the second direction Y, the orthographic projection of the first insulating portion 331 at least partially overlaps with the orthographic projection of the first end plate 22, the orthographic projection of the second insulating portion 332 at least partially overlaps with the orthographic projection of the first end plate 22, the orthographic projection of the first insulating portion 331 at least partially overlaps with the orthographic projection of the second end plate 23, and the orthographic projection of the second insulating portion 332 at least partially overlaps with the orthographic projection of the second end plate 23.

[0216] Both the first insulating part 331 and the second insulating part 332 are insulating heat-shrink tubing, made of polyethylene terephthalate (PET), with a wall thickness of 0.1 mm. The tubing facilitates assembly between the first wall 311 and the first insulating part 331, and between the second wall 312 and the second insulating part 332, while also providing insulation protection to the outside of the first and second walls 311 and 312. The 0.1 mm thickness of the insulating heat-shrink tubing ensures high strength for both parts while minimizing assembly space requirements.

[0217] The restraint member 31 can be a steel strip. The first wall 311 includes a plurality of first side surfaces 311c. When viewed along the length of the first wall 311, the plurality of first side surfaces 311c are arranged circumferentially along the first wall 311. Two adjacent first side surfaces 311c are connected by a first arc surface 311d, the radius of which is 10μm to 50μm. The second wall 312 includes a plurality of second side surfaces 312a. When viewed along the length of the second wall 312, the plurality of second side surfaces 312a are arranged circumferentially along the second wall 312. Two adjacent second side surfaces 312a are connected by a second arc surface 312b, the radius of which is 10μm to 50μm. The two adjacent sides of the restraint member 31 are connected by an arc surface, which makes the two adjacent sides smoothly transition and reduces the sharp edges. The radius of the arc surface is 10μm~50μm, which can reduce the risk of the restraint member 31 scratching the flexible connector 32 or the insulating member 33, so that the flexible connector 32 or the insulating member 33 has a longer service life and reduces the risk of short circuit between positive and negative terminals.

[0218] At the connection position of two adjacent restraint members 31, the adjacent first wall 311 and second wall 312 are connected by a plurality of flexible connectors 32. The plurality of flexible connectors 32 are spaced apart along the second direction Y. The plurality of flexible connectors 32 include a first end connector 325 and a second end connector 326. The first end connector 325 is disposed at the first end 311a and the second end connector 326 is disposed at the second end 311b. In each battery cell group 20, along the second direction Y, the two battery cells 21 that are farthest apart among the plurality of battery cells 21 are the first end battery cell 21a and the second end battery cell 21b, respectively. On the same projection plane perpendicular to the first direction X, the orthographic projection of the first end battery cell 21a falls into the orthographic projection of the first end connector 325, and the orthographic projection of the second end battery cell 21b falls into the orthographic projection of the second end connector 326.

[0219] According to the battery device 100 of this application embodiment, multiple restraint members 31 are connected together by flexible connectors 32, which can realize the synchronous restraint of multiple battery cell groups 20, making assembly convenient and quick. Furthermore, since two adjacent restraint members 31 are connected by flexible connectors 32, the flexible connectors 32 can undergo flexible deformation to absorb the expansion force of the battery cells 21. When the expansion degree of different battery cell groups 20 is inconsistent, the restraint members 31 are connected by the flexible connectors 32 with extensibility, allowing a certain degree of relative displacement and stress release. This transforms the concentrated tensile stress that originally acted on the rigid restraint members 31 and may have caused the restraint members 31 to break into dispersed stress that can be absorbed and buffered by the flexible connectors 32, reducing the risk of the restraint members 31 breaking. At the same time, the flexible connectors 32 absorb the expansion force of the battery cells 21, so that the multiple restraint members 31 are still in a connected state. The restraint members 31 have a good restraining effect on the battery cell groups 20, and the battery device 100 maintains good structural integrity, which can improve the safety and reliability of the battery device 100. By having both the first wall 311 and the second wall 312 pass through the first constraint space 32a, the flexible connector 32 encloses the structure formed by the first wall 311 and the second wall 312. The flexible connector 32 has a good constraint effect on the first wall 311 and the second wall 312, and is convenient to absorb the tensile stress transmitted to the first wall 311 and the second wall 312 by the expansion of the battery cell 21. The first part 321 is disposed around the outside of the first wall 311 and the second wall 312. The two ends of the first part 321 are connected to the second part 322 and the third part 323 respectively. The second part 322 and the third part 323 are stacked and connected, and the first part 321, the second part 322 and the third part 323 together form a first constraint space 32a that surrounds the first wall 311 and the second wall 312. This facilitates the assembly of the flexible connector 32 with the first wall 311 and the second wall 312. The second part 322 and the third part 323 have high connection reliability, so that the flexible connector 32 has a good constraint effect on the first wall 311 and the second wall 312. The second part 322 and the third part 323 are located on the same side of the first wall 311 and the second wall 312 along the third direction Z. When assembling the restraint assembly 30 with the multiple battery cell groups 20, they can be fitted from the side of the first wall 311 and the second wall 312 where the second part 322 and the third part 323 are not located towards the multiple battery cell groups 20. This reduces the risk of damage to the connection area of ​​the second part 322 and the third part 323, helps to maintain the integrity of the flexible connector 32, reduces the risk of damage to the flexible connector 32 during the assembly of the restraint assembly 30 with the multiple battery cell groups 20, and makes the restraint assembly 30 have a better restraint effect on the multiple battery cell groups 20.The first end battery cell 21a and the second end battery cell 21b are distributed at both ends of the plurality of battery cells 21 in the second direction Y. During the charging and discharging process of the battery device 100, the expansion stress of the first end battery cell 21a and the second end battery cell 21b in the first direction X is large. The first end connector 325 is correspondingly arranged with the first end battery cell 21a and the second end connector 326 is correspondingly arranged with the second end battery cell 21b, which can absorb the expansion stress of the first end battery cell 21a and the second end battery cell 21b, so that the adjacent first wall 311 and second wall 312 remain connected.

[0220] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Multiple battery cell groups are spaced apart along a first direction, and each battery cell group includes multiple battery cells arranged along a second direction, which is perpendicular to the first direction. The restraint assembly includes multiple restraint members and flexible connectors. The multiple restraint members are arranged along the first direction. The restraint members are ring-shaped structures, and each restraint member is sleeved on the outside of one of the battery cell groups. Along the first direction, the restraint member includes a first wall and a second wall disposed opposite to each other, wherein in two adjacent restraint members, the first wall of one is disposed adjacent to the second wall of the other. The flexible connector is located between two adjacent battery cell groups, and the flexible connector connects the adjacent first wall and the second wall.

2. The battery device according to claim 1, characterized in that, The flexible connector is wound around the outside of the first wall and the second wall.

3. The battery device according to claim 1, characterized in that, The flexible connector has a first constraint space, and both the first wall and the second wall pass through the first constraint space.

4. The battery device according to claim 3, characterized in that, The flexible connector includes a first part, a second part, and a third part. The first part is wrapped around the outside of the first wall and the second wall. The two ends of the first part are respectively connected to the second part and the third part. The second part and the third part are stacked and connected so that the first part, the second part, and the third part enclose the first constraint space.

5. The battery device according to claim 4, characterized in that, On the same projection plane perpendicular to the first direction, the orthographic projection of the second part and the orthographic projection of the third part do not overlap with the orthographic projection of the first wall, and the orthographic projection of the second part and the orthographic projection of the third part do not overlap with the orthographic projection of the second wall.

6. The battery device according to claim 4, characterized in that, The second part and the third part are located on the same side of the first wall and the second wall along a third direction, and the third direction, the second direction and the first direction are perpendicular to each other.

7. The battery device according to claim 4, characterized in that, The second part and the third part have an overlapping area, the overlapping area having a dimension greater than or equal to 10 mm in its width direction; The width of the overlapping region is perpendicular to the length of the first wall.

8. The battery device according to claim 4, characterized in that, The first part, the second part, and the third part are integrally formed.

9. The battery device according to claim 2, characterized in that, The thickness of the flexible connector is 0.07mm to 0.09mm.

10. The battery device according to claim 1, characterized in that, The flexible connector includes a polyimide film, a cloth tape, or a polytetrafluoroethylene film.

11. The battery device according to any one of claims 1-10, characterized in that, The adjacent first wall and second wall are connected by a plurality of flexible connectors, which are spaced apart along the length of the first wall.

12. The battery device according to claim 11, characterized in that, The first wall includes a first end and a second end disposed opposite to each other along the second direction; The plurality of flexible connectors are spaced apart along the second direction, and the plurality of flexible connectors include a first end connector and a second end connector, wherein the first end connector is disposed at the first end and the second end connector is disposed at the second end; In each battery cell group, along the second direction, the two battery cells that are furthest apart from each other are the first end battery cell and the second end battery cell, respectively. On the same projection plane perpendicular to the first direction, the orthographic projection of the first end battery cell falls within the orthographic projection of the first end connector, and the orthographic projection of the second end battery cell falls within the orthographic projection of the second end connector.

13. The battery device according to any one of claims 1-10, characterized in that, The restraint is a metal component, and each restraint is provided with an insulating component, which at least covers the surface of the first wall facing the second wall and the surface of the second wall facing the first wall.

14. The battery device according to claim 13, characterized in that, The insulating component includes a first insulating part and a second insulating part, both of which are tubular components. The first wall passes through the first insulating part, and the second wall passes through the second insulating part. On adjacent first and second walls, the flexible connector is wound around adjacent first and second insulating portions.

15. The battery device according to claim 14, characterized in that, The restraint member further includes a third wall, a fourth wall, a first transition wall, a second transition wall, a third transition wall, and a fourth transition wall. The third wall and the fourth wall are arranged opposite to each other along the second direction. The first wall and the third wall are connected through the first transition wall. The first wall and the fourth wall are connected through the second transition wall. The second wall and the third wall are connected through the third transition wall. The second wall and the fourth wall are connected through the fourth transition wall. The first transition wall and the second transition wall both pass through the first insulating portion, and the third transition wall and the fourth transition wall both pass through the second insulating portion.

16. The battery device according to claim 15, characterized in that, The first insulating part and the second insulating part are separately disposed.

17. The battery device according to claim 16, characterized in that, Along the circumference of the restraint member, the first insulating portion and the second insulating portion are circumferentially spaced apart, at least a portion of the third wall is exposed between the first insulating portion and the second insulating portion, and at least a portion of the fourth wall is exposed between the first insulating portion and the second insulating portion.

18. The battery device according to claim 17, characterized in that, Each of the battery cell groups further includes a first end plate and a second end plate disposed opposite to each other along the second direction, wherein in each of the battery cell groups, all the battery cells are located between the first end plate and the second end plate along the second direction; On the same projection plane perpendicular to the second direction, the orthographic projection of the first insulating portion at least partially overlaps with the orthographic projection of the first end plate, the orthographic projection of the second insulating portion at least partially overlaps with the orthographic projection of the first end plate, the orthographic projection of the first insulating portion at least partially overlaps with the orthographic projection of the second end plate, and the orthographic projection of the second insulating portion at least partially overlaps with the orthographic projection of the second end plate.

19. The battery device according to claim 14, characterized in that, Both the first insulating part and the second insulating part are insulating heat shrink tubing sleeves.

20. The battery device according to claim 14, characterized in that, The thickness of the first insulating portion is 0.05mm to 0.15mm; and / or, The thickness of the second insulating part is 0.05mm to 0.15mm.

21. The battery device according to claim 13, characterized in that, The insulating component is a tubular structure, and the binding component is integrally inserted through the insulating component.

22. The battery device according to claim 13, characterized in that, The insulating material includes polyethylene terephthalate or polyvinyl chloride.

23. The battery device according to claim 13, characterized in that, The surface roughness of the insulating component is greater than that of the flexible connector.

24. The battery device according to claim 23, characterized in that, The ratio of the surface roughness of the insulating component to the surface roughness of the flexible connector is 10 to 100.

25. The battery device according to any one of claims 1-10, characterized in that, The first wall includes a plurality of first side surfaces, which are arranged circumferentially along the length of the first wall; adjacent first side surfaces are connected by a first arc surface with a radius of 10 μm to 50 μm; and / or, The second wall includes a plurality of second side surfaces. When viewed along the length of the second wall, the plurality of second side surfaces are arranged circumferentially along the second wall. Two adjacent second side surfaces are connected by a second arc surface, the radius of which is 10μm to 50μm.

26. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-25.

27. A restraint assembly, characterized in that, include: Multiple restraints are arranged along a first direction. The restraints are ring-shaped structures. Along the first direction, each restraint includes a first wall and a second wall that are disposed opposite to each other. In two adjacent restraints, the first wall of one is disposed adjacent to the second wall of the other. The first direction is perpendicular to the length direction of the first wall. A flexible connector connects the adjacent first wall and the second wall.

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