Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, and belongs to the technical field of batteries. The battery device comprises a plurality of battery monomers and a buffer assembly, the plurality of single batteries are arranged along a first direction; the buffer assembly is arranged between two adjacent battery monomers, the buffer assembly comprises a frame, and the frame comprises a plurality of sub-frames which are connected end to end; wherein the buffer assembly further comprises a binding piece, the binding piece is connected with at least two of the plurality of sub-frames to limit outward deformation of the sub-frames, and according to the technical scheme provided by the invention, the reliability of the battery device can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of reliability and service life.

[0003] In the development of battery technology, in addition to improving battery performance, the reliability of batteries during use is also an issue that needs to be considered.

[0004] Therefore, how to improve battery reliability is an urgent problem to be solved in battery technology. Utility Model Content

[0005] The embodiments of the present application provide a battery device and an electrical device, which can improve the reliability of the battery device during use.

[0006] In a first aspect, an embodiment of the present application provides a battery device, comprising a plurality of battery cells and a buffer assembly; the plurality of battery cells are arranged along a first direction; the buffer assembly is disposed between two adjacent battery cells, the buffer assembly comprises a frame, the frame comprises a plurality of sub-frames connected end to end; wherein the buffer assembly further comprises a restraining member, the restraining member is connected to at least two of the plurality of sub-frames to limit outward deformation of the sub-frames.

[0007] In the above technical solution, when a battery cell expands and causes part of the battery cell to enter between multiple sub-frames, the continued expansion of the part of the battery cell will provide a squeezing force from the inside of the buffer assembly to the outside of the buffer assembly to the multiple sub-frames, which will cause the sub-frames to deform outward, resulting in the sub-frames being squeezed out between the battery cells, so that the sub-frames lose their buffering function. The restraining member is connected to at least two of the multiple sub-frames, and when the connected sub-frames are subjected to the squeezing force of the battery cell and tend to deform outward, the squeezing force on the sub-frame can be transmitted to other sub-frames through the restraining member, thereby offsetting at least part of the squeezing force on other sub-frames, thereby reducing the risk of the sub-frame connected to the restraining member deforming outward when subjected to the squeezing force of the battery cell, resulting in the buffer assembly buffering failure, thereby improving the reliability of the battery device during use.

[0008] In some embodiments, the restraining member is made of insulating material.

[0009] In the above technical solution, since at least two of the multiple sub-frames of the restraint are connected and used to transmit the extrusion force of the battery cell exerted on the sub-frame from the inside of the buffer assembly to the outside of the buffer assembly, so as to limit the outward deformation of the sub-frame, on the plane perpendicular to the first direction, the orthographic projection of at least part of the restraint should coincide with the orthographic projection of the area enclosed by the multiple sub-frames in the buffer assembly, so that at least part of the restraint is located between two adjacent battery cells. Configuring the restraint as an insulating material can enable the insulating member to insulate and isolate two adjacent battery cells, so as to reduce the risk of short circuit between two adjacent battery cells, thereby improving the reliability of the battery device.

[0010] In some embodiments, the material of the restraint is PET.

[0011] In the above technical solution, the material of the restraint is PET. Since PET has good tensile strength and certain thermal stability, the restraint made of PET can have good tensile strength and certain thermal stability, thereby reducing the risk of the restraint breaking when restricting the outward deformation of the sub-frame, causing the sub-frame to deform outward. At the same time, it also reduces the risk of the restraint softening under the influence of the heat generated when the battery cell is working, resulting in the weakening of the restraint's ability to restrict the outward deformation of the sub-frame, thereby improving the reliability of the battery device.

[0012] In some embodiments, the binding member is connected to at least two of the sub-frames that are arranged opposite to each other.

[0013] In the above technical solution, the restraining member connects at least two oppositely arranged sub-frames, so that when the connected sub-frames are subjected to the squeezing pressure of the battery cell and tend to deform outward, the squeezing force exerted on the sub-frames can be transmitted to the oppositely arranged sub-frames through the restraining member, thereby better offsetting the squeezing force exerted on other sub-frames, thereby further reducing the risk of the sub-frame connected to the restraining member deforming outward when subjected to the squeezing pressure of the battery cell, resulting in buffer failure of the buffer assembly, thereby further improving the reliability of the battery device during use.

[0014] In some embodiments, the binding member is connected to all of the plurality of sub-frames.

[0015] In the above technical solution, the restraint is connected to multiple sub-frames. On the one hand, when the multiple sub-frames are subjected to the extrusion pressure of the battery cells from the inside of the buffer assembly to the outside of the buffer, the restraint can simultaneously limit the outward deformation of the multiple sub-frames, and the structure is simple and easy to implement. On the other hand, the extrusion forces between two relatively arranged sub-frames among the multiple sub-frames can offset each other, so that when the restraint is connected to multiple sub-frames at the same time, the reliability of the restraint in limiting the outward deformation of the sub-frames is higher.

[0016] In some embodiments, the restraining member includes a diaphragm, the diaphragm is provided with a hollow area, and the diaphragm is connected to the multiple sub-frames.

[0017] In the above technical solution, the diaphragm is provided with a hollow area, and the diaphragm is connected to multiple sub-frames, thereby reducing the volume of the diaphragm and the weight of the buffer assembly compared to the case where the diaphragm does not have a hollow area, thereby reducing the weight of the battery device.

[0018] In some embodiments, the thickness of the membrane is 50-100 μm.

[0019] In the above technical solution, when the thickness of the diaphragm is greater than 50μm, the diaphragm has a certain structural strength, thereby reducing the risk of breakage when the restraining member transmits the extrusion force of the battery cell to the sub-frame; when the thickness of the diaphragm is less than 100μm, the volume of the diaphragm can be reduced and thus the weight of the diaphragm can be reduced, thereby reducing the weight of the buffer assembly and thus reducing the weight of the battery device; therefore, when the thickness of the diaphragm is 50~100μm, the diaphragm can have a certain structural strength, thereby reducing the risk of breakage when the restraining member transmits the extrusion force of the battery cell to the sub-frame, and can also reduce the weight of the diaphragm, thereby reducing the weight of the buffer assembly and thus reducing the weight of the battery device.

[0020] In some embodiments, the diaphragm includes a main body and a plurality of extensions extending from the edge of the main body; in the same projection plane perpendicular to the first direction, the orthographic projection of the frame surrounds the orthographic projection of the main body; the plurality of extensions are arranged at intervals along the circumference of the frame, and the hollow area is formed between two adjacent extensions, and the extensions are connected to the sub-frame.

[0021] In the above technical solution, the extension part is connected to the sub-frame, and multiple extension parts are arranged at intervals along the circumference of the frame, so that the diaphragm can more evenly limit the outward deformation of the sub-frame through the multiple extension parts, thereby making the sub-frame more evenly stressed.

[0022] In some embodiments, the restraining member also includes an outer ring, which is arranged around the outer periphery of the frame; the restraining member includes two diaphragms, which are respectively arranged on opposite sides of the frame along the first direction, and one end of the extension portion away from the main body portion is connected to the outer ring; the frame is bonded to the battery cell.

[0023] In the above technical solution, on the one hand, the outer ring is arranged on the outer periphery of the frame, and the restraining member includes two diaphragms, which are respectively arranged on opposite sides of the frame along the first direction, so that the diaphragm can limit the outward deformation of the sub-frame through the outer ring, thereby improving the reliability of the battery device; on the other hand, the buffer assembly is bonded to the battery cell, and the diaphragm is provided with a hollow area, so that the sub-frame can be bonded to the battery cell through the hollow area. At the same time, since multiple extension portions are arranged at intervals along the circumference of the frame, a hollow area is formed between two adjacent extension portions, so that the sub-frame can be more evenly bonded to the battery cell, thereby increasing the stability of the bonding between the sub-frame and the battery cell.

[0024] In some embodiments, the diaphragm and the outer ring are integrally formed.

[0025] In the above technical solution, the diaphragm and the outer ring are integrally formed, thereby increasing the stability of the connection between the diaphragm and the outer ring, thereby reducing the risk of breakage at the connection between the diaphragm and the outer ring when the restraining member restricts the sub-frame from deforming outward, thereby improving the reliability of the battery device.

[0026] In some embodiments, the sub-frame is provided with a through hole for the extension portion to pass through; the membrane further comprises a limiting portion, the limiting portion being provided at one end of the extension portion away from the main body portion, the limiting portion being used to limit the extension portion from being separated from the through hole. Along the first direction, the thickness of the limiting portion is greater than the thickness of the extension portion.

[0027] In the above technical solution, the extending portion is restricted from being separated from the through hole by the limiting portion, thereby restricting the sub-frame from deforming outwards, and the structure is simple and easy to implement.

[0028] In some embodiments, the through hole includes a first hole segment and a second hole segment, the cross-sectional area of ​​the first hole segment is larger than the cross-sectional area of ​​the second hole segment, and a step surface is formed between the first hole segment and the second hole segment; the limiting portion is at least partially disposed in the first hole segment and abuts against the step surface, and the extension portion is at least partially disposed in the second hole segment.

[0029] In the above technical solution, the limiting portion is at least partially arranged in the first hole segment and abuts against the step surface, and the extending portion is at least partially arranged in the second hole segment. Therefore, when the sub-frame tends to deform outward, the abutment between the limiting portion and the step surface, relative to the situation where the friction force between the limiting portion and the through hole limits the outward deformation of the sub-frame, the abutment force generated by the abutment between the limiting portion and the step surface limits the outward deformation of the sub-frame, which can reduce the risk of the sub-frame detaching from the diaphragm and deforming outward, thereby improving the reliability of the battery device.

[0030] In a second aspect, an embodiment of the present application provides an electrical device, comprising the above-mentioned battery device, wherein the battery device is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0033] Figure 2 An exploded view of the structure of a battery device provided in some embodiments of the present application;

[0034] Figure 3 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0035] Figure 4 An exploded view of the structure of a battery cell and a buffer assembly provided in some embodiments of the present application;

[0036] Figure 5 A schematic diagram of the structure of a battery cell and a buffer assembly provided in some embodiments of the present application;

[0037] Figure 6 for Figure 5 Sectional view of AA in the middle;

[0038] Figure 7 An exploded view of the structure of a buffer assembly provided in some embodiments of the present application;

[0039] Figure 8 A schematic diagram of the structure of a battery cell and another buffer assembly provided in some embodiments of the present application;

[0040] Fig. 9 for Figure 8 Cross-sectional view of BB.

[0041] icon:

[0042] 1000-vehicle; 100-battery device; 10-box; 11-first box body; 12-second box body; 20-battery cell; 21-end cover; 22-shell; 23-electrode assembly; 30-buffer assembly; 31-frame; 311-sub-frame; 3111-through hole; 3111A-first hole section; 3111B-second hole section; 3112-step surface; 311A-first sub-frame; 311B-second sub-frame; 311C-third sub-frame; 311D-fourth sub-frame; 32-binding member; 321-diaphragm; 321A-hollow area; 3211-main body; 3212-extension part; 3213-limiting part; 322-outer ring; 200-controller; 300-motor; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0045] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0048] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0049] The term “plurality” used in this application refers to two or more (including two).

[0050] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0051] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0052] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0053] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0054] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0055] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0056] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0057] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0058] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0059] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0060] The following will mainly focus on the rectangular battery cell. It should be understood that the embodiments described below are also applicable to cylindrical battery cells, soft-pack battery cells, or blade battery cells in some aspects.

[0061] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, the reliability of the battery device must also be considered.

[0062] In a common battery cell assembly, a buffer assembly is generally provided between two adjacent battery cells, so that when the battery cells swell after use, the buffer assembly is compressed by the battery cells to provide buffer space for the battery cells, thereby reducing the risk of excessive pressure inside the battery cells due to the abutment of the battery cells when they swell. Generally, the buffer assembly includes a frame, and when the battery cells expand and part of the battery cells enter the frame, the part of the battery cells continues to expand, while providing an extrusion force in the thickness direction of the frame, and also provides an extrusion force from the inside of the frame to the outside of the buffer, which causes the frame of the frame to deform outward, thereby causing the frame to be squeezed out between the battery cells, so that the sub-frame loses its buffering function.

[0063] Based on the above considerations, in order to reduce the risk of the buffer assembly being squeezed out between the battery cells when the battery cells expand, resulting in reduced reliability of the battery cells, the embodiment of the present application provides a battery device, including a plurality of battery cells and a buffer assembly; the plurality of battery cells are arranged along a first direction; the buffer assembly is arranged between two adjacent battery cells, the buffer assembly includes a frame, the frame includes a plurality of sub-frames connected end to end; wherein the buffer assembly also includes a restraining member, the restraining member is connected to at least two of the plurality of sub-frames to limit the outward deformation of the sub-frames.

[0064] In a battery device of this structure, the restraint is connected to at least two of the multiple sub-frames. When the connected sub-frame is subjected to the squeezing pressure of the battery cell and tends to deform outward, the squeezing force exerted on the sub-frame can be transmitted to other sub-frames through the restraint, thereby offsetting at least part of the squeezing force exerted on the other sub-frames. This reduces the risk of the sub-frame connected to the restraint deforming outward when subjected to the squeezing pressure of the battery cell, resulting in buffer failure of the buffer assembly, thereby improving the reliability of the battery device during use.

[0065] The technical solutions described in the embodiments of the present application are applicable to battery cells, battery devices, and electrical devices using the battery devices.

[0066] Electrical devices include, but are not limited to, battery vehicles, electric vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.

[0067] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0068] For example, Figure 1 The schematic diagram of the structure of the vehicle 1000 of some embodiments of the present application, the vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc. A motor 300, a controller 200 and a battery device 100 may be arranged inside the vehicle 1000, and the controller 200 is used to control the battery device 100 to power the motor 300. For example, a battery device 100 may be arranged at the bottom or the front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power supply for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power demand during the start, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 may not only be used as an operating power supply for the vehicle 1000, but also as a driving power supply for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0069] In order to meet different power usage requirements, the battery device 100 may include a plurality of battery cells 20, wherein the plurality of battery cells 20 may be connected in series, in parallel, or in a hybrid connection, wherein the hybrid connection refers to a mixture of series and parallel connections. The battery device 100 may also be referred to as a battery pack. Optionally, a plurality of battery cells 20 may first be connected in series, in parallel, or in a hybrid connection to form a battery cell 20 assembly, and a plurality of battery cell 20 assemblies may then be connected in series, in parallel, or in a hybrid connection to form a battery device 100. In other words, a plurality of battery cells 20 may directly form a battery device 100, or may first form a battery cell 20 assembly, and then a battery cell 20 assembly may then form a battery device 100.

[0070] For example, see Figure 2 , Figure 2 1 is an exploded view of a battery device 100 according to some embodiments of the present application. The battery device 100 may include a plurality of battery cells 20. The battery device 100 may also include a housing 10. The housing 10 has a hollow structure inside, and the plurality of battery cells 20 are accommodated in the housing 10. Figure 2 As shown, they are respectively referred to as the first box body 11 and the second box body 12, and the first box body 11 and the second box body 12 are buckled together. The shapes of the first box body 11 and the second box body 12 can be determined according to the shapes of the combination of multiple battery cells 20, and the first box body 11 and the second box body 12 can both have an open surface. For example, the first box body 11 and the second box body 12 can both be hollow rectangular parallelepipeds and each has only one open surface, the open surface of the first box body 11 and the open surface of the second box body 12 are arranged opposite to each other, and the first box body 11 and the second box body 12 are buckled together to form a box body 10 with a closed chamber. Multiple battery cells 20 are connected in parallel or in series or in mixed combination and are placed in the box body 10 formed by the buckling of the first box body 11 and the second box body 12.

[0071] Optionally, the battery device 100 may also include other structures, which are not described one by one here. For example, the battery device 100 may also include a busbar component, which is used to realize electrical connection between multiple battery cells 20, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can realize electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of multiple battery cells 20 can be further led out through the box 10 through the conductive mechanism.

[0072] According to different power requirements, the number of battery cells 20 can be set to any value. Multiple battery cells 20 can be connected in series, parallel or mixed to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery device 100 may be large, for ease of installation, the battery cells 20 can be grouped, and each group of battery cells 20 constitutes a battery cell 20 assembly. The number of battery cells 20 included in the battery cell 20 assembly is not limited and can be set according to demand. The battery device 100 may include multiple battery cell 20 assemblies, which can be connected in series, parallel or mixed.

[0073] According to some embodiments of this application, please refer to Figure 2 and Figure 3 , and please refer to Figure 4-Figure 6 , Figure 3 This is an exploded view of the structure of the battery cell 20 provided in some embodiments of the present application. Figure 4 The structure explosion diagram of the battery cell 20 and the buffer assembly 30 provided in some embodiments of the present application is shown in FIG. Figure 5 This is a schematic diagram of the structure of a battery cell 20 and a buffer assembly 30 provided in some embodiments of the present application. Figure 6 for Figure 5 The embodiment of the present application provides a battery device 100, comprising a plurality of battery cells 20 and a buffer assembly 30; the plurality of battery cells 20 are arranged along a first direction X; the buffer assembly 30 is disposed between two adjacent battery cells 20, the buffer assembly 30 comprises a frame 31, the frame 31 comprises a plurality of sub-frames 311 connected end to end; wherein the buffer assembly 30 further comprises a restraining member 32, the restraining member 32 is connected to at least two of the plurality of sub-frames 311 to limit the outward deformation of the sub-frames 311.

[0074] In some embodiments, please refer to Figure 3 The battery cell 20 includes an end cap 21, a shell 22 and an electrode assembly 23. One side of the shell 22 has an opening for the electrode assembly 23 to pass through. The electrode assembly 23 is accommodated in the shell 22, and the end cap 21 is used to cover the opening.

[0075] In some embodiments, the electrode assembly 23 has a straight area, the electrode assembly 23 includes a positive electrode sheet and a negative electrode sheet, the electrode assembly 23 has a straight area, and the portion of the positive electrode sheet located in the straight area and the portion of the negative electrode sheet located in the straight area are stacked along the first direction X.

[0076] Exemplarily, the electrode assembly 23 may be a laminated structure, wherein the positive electrode sheet and the negative electrode sheet are both in a straight shape and are stacked along the first direction X; or, please refer to Figure 3The electrode assembly 23 may be a winding structure, and the electrode assembly 23 includes a straight region and two bending regions, and the two bending regions are respectively connected to the two ends of the straight region in the second direction Y. The positive electrode sheet and the negative electrode sheet are straight in the straight region and bent in the bending region. The second direction Y is a direction perpendicular to the first direction X.

[0077] It can be understood that in the embodiment where the portion of the positive electrode plate located in the straight area and the portion of the negative electrode plate located in the straight area are stacked along the first direction X, the volume of the battery cell 20 expanded along the first direction X is the largest, so that arranging the buffer assembly 30 between two adjacent battery cells 20 in the first direction X can further reduce the risk of the battery cells 20 abutting against each other when expanding, resulting in excessive internal pressure in the battery cells 20.

[0078] The buffer assembly 30 is a component that is disposed between two adjacent battery cells 20 and can be compressed along the first direction X.

[0079] The frame 31 is a component of the buffer member that can be compressed along the first direction X. The frame 31 can be made of a material with a certain compression rate. For example, the frame 31 can be made of silicone rubber.

[0080] It can be understood that the frame 31 is used to be compressed when the battery cell 20 expands to provide the battery cell 20 with space for expansion, thereby reducing the risk of the battery cell 20 directly abutting against the battery cell 20 when expanding, resulting in excessive pressure inside the battery cell 20 .

[0081] The sub-frame 311 is a part of the frame 31 , and a plurality of sub-frames 311 are sequentially connected end to end to form the frame 31 .

[0082] In some embodiments, please refer to Figure 5 The plurality of sub-frames 311 include a first sub-frame 311A, a second sub-frame 311B, a third sub-frame 311C and a fourth sub-frame 311D which are connected end to end in sequence. The first sub-frame 311A ​​and the third sub-frame 311C are arranged at intervals along the second direction Y and both extend along the third direction Z, and the second sub-frame 311B and the fourth sub-frame 311D are arranged at intervals along the third direction Z and both extend along the second direction Y. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0083] Understandably, please refer to Figure 6 When the battery cell 20 expands and part of the battery cell 20 enters between the multiple sub-frames 311, the continued expansion of this part of the battery cell 20 will provide an extrusion force from the inside of the buffer assembly 30 to the outside of the buffer component on the multiple sub-frames 311, which will cause the sub-frames 311 to deform outward, thereby causing the sub-frames 311 to be squeezed out between the battery cells 20, thereby causing the sub-frames 311 to lose their buffering effect.

[0084] The restraining member 32 is a component in the buffer member that connects at least two sub-frames 311 .

[0085] “The restraint 32 is connected to at least two of the multiple sub-frames 311” can be understood as the restraint 32 is connected to any two of the multiple sub-frames 311, or the restraint 32 is connected to any three of the multiple sub-frames 311, or the restraint 32 is connected to all of the multiple sub-frames 311.

[0086] Taking the connection of the restraining member 32 with any two sub-frames 311 among the multiple sub-frames 311 as an example, the restraining member 32 can be connected to two adjacent sub-frames 311 respectively, or the restraining member 32 can be connected to two oppositely arranged sub-frames 311 respectively. It can be understood that when the sub-frame 311 connected by the restraining member 32 is subjected to the extrusion force of the battery cell 20 and has a tendency to deform outward, the extrusion force exerted on the sub-frame 311 can be transmitted to other sub-frames 311 through the restraining member 32, thereby offsetting at least part of the extrusion force exerted on other sub-frames 311, especially when the two sub-frames 311 connected by the restraining member 32 are two oppositely arranged sub-frames 311, the extrusion forces of the two sub-frames 311 transmitted by the restraining member 32 are in opposite directions, so that the restraining member 32 can further limit the outward deformation of the sub-frame 311.

[0087] The restraint 32 can be connected to any position of the sub-frame 311. For example, the restraint 32 can be connected to the side of the sub-frame 311 located inside the frame 31, or the restraint 32 can be connected to the side of the sub-frame 311 located outside the frame 31, or the restraint 32 can be connected to the side of the sub-frame 311 facing the battery cell 20.

[0088] The binding member 32 can be connected to the sub-frame 311 in a variety of ways. For example, the binding member 32 can be connected to the sub-frame 311 by bonding, hot-melt connection, etc.

[0089] “The sub-frame 311 is deformed outward” can be understood as that part of the sub-frame 311 is deformed in a direction from the center of the frame 31 to the outside of the frame 31 .

[0090] It can be understood that the tensile strength of the restraining member 32 itself should be greater than the yield strength of the sub-frame 311 so that the restraining member 32 can limit the outward deformation of the sub-frame 311.

[0091] In this embodiment, the restraint 32 is connected to at least two of the multiple sub-frames 311. When the connected sub-frame 311 is subjected to the squeezing force of the battery cell 20 and tends to deform outward, the squeezing force exerted on the sub-frame 311 can be transmitted to other sub-frames 311 through the restraint 32, thereby offsetting at least part of the squeezing force exerted on the other sub-frames 311, thereby reducing the risk of the sub-frame 311 connected to the restraint 32 deforming outward when subjected to the squeezing force of the battery cell 20, resulting in buffer failure of the buffer assembly 30, thereby improving the reliability of the battery device 100 during use.

[0092] According to some embodiments of this application, please refer to Figure 6 , the restraining member 32 is made of insulating material.

[0093] In this embodiment, since at least two of the multiple sub-frames 311 of the restraining member 32 are connected and used to transmit the extrusion force of the battery cell 20 exerted on the sub-frame 311 from the inside of the buffer assembly 30 to the outside of the buffer assembly, so as to limit the outward deformation of the sub-frame 311, so that on the plane perpendicular to the first direction X, the orthographic projection of at least part of the restraining member 32 should coincide with the orthographic projection of the area enclosed by the multiple sub-frames 311 in the buffer assembly 30, so that at least part of the restraining member 32 is located between two adjacent battery cells 20. Configuring the restraining member 32 as an insulating material can enable the insulating member to insulate and isolate two adjacent battery cells 20, so as to reduce the risk of short circuit between two adjacent battery cells 20, thereby improving the reliability of the battery device 100.

[0094] According to some embodiments of the present application, the material of the restraining member 32 is PET.

[0095] PET (Polyethylene Terephthalate) is a widely used thermoplastic polyester material, belonging to polyester plastics. It has good tensile strength and good heat resistance. At the same time, PET has the advantages of being easy to obtain and easy to process, so it is easy to process and manufacture the restraint 32.

[0096] In this embodiment, the material of the restraint 32 is PET (polyethylene terephthalate). Since PET has good tensile strength and certain thermal stability, the restraint 32 made of PET can have good tensile strength and certain thermal stability, thereby reducing the risk of the restraint 32 breaking when restricting the sub-frame 311 from deforming outward, causing the sub-frame 311 to deform outward. At the same time, it also reduces the risk of the restraint 32 softening under the influence of the heat generated when the battery cell 20 is working, resulting in the weakening of the ability of the restraint 32 to restrict the outward deformation of the sub-frame 311, thereby improving the reliability of the battery device 100.

[0097] According to some embodiments of this application, please refer to Figure 5 The restraining member 32 is connected to at least two oppositely disposed sub-frames 311 .

[0098] “The restraining member 32 is connected to at least two oppositely disposed sub-frames 311 ” can be understood as at least two sub-frames 311 being oppositely disposed among the sub-frames 311 connected to the restraining member 32 .

[0099] In this embodiment, the restraint member 32 connects at least two oppositely disposed sub-frames 311, so that when the connected sub-frame 311 is subjected to the squeezing force of the battery cell 20 and tends to deform outward, the squeezing force exerted on the sub-frame 311 can be transmitted to the sub-frame 311 opposite to it through the restraint member 32, thereby better offsetting the squeezing force exerted on other sub-frames 311, thereby further reducing the risk of the sub-frame 311 connected to the restraint member 32 deforming outward when subjected to the squeezing force of the battery cell 20, resulting in buffer failure of the buffer assembly 30, thereby further improving the reliability of the battery device 100 during use.

[0100] According to some embodiments of this application, please refer to Figure 5 The restraining member 32 is connected to the plurality of sub-frames 311 .

[0101] In this embodiment, the restraint 32 is connected to multiple sub-frames 311. On the one hand, when the multiple sub-frames 311 are subjected to the extrusion force of the battery cells 20 directed from the inside of the buffer assembly 30 to the outside of the buffer, the restraint 32 can simultaneously limit the multiple sub-frames 311 from deforming outward, and the structure is simple and easy to implement. On the other hand, the extrusion forces between two relatively arranged sub-frames 311 among the multiple sub-frames 311 can offset each other, so that when the restraint 32 is connected to multiple sub-frames 311 at the same time, the reliability of the restraint 32 in limiting the outward deformation of the sub-frames 311 is higher.

[0102] According to some embodiments of this application, please refer to Figure 5-Figure 8 , Figure 7 This is a structural exploded view of a buffer assembly 30 provided in some embodiments of the present application. Figure 8 The structure diagram of the battery cell 20 and another buffer assembly 30 provided in some embodiments of the present application. The restraining member 32 includes a diaphragm 321 , the diaphragm 321 is provided with a hollow area 321A, and the diaphragm 321 is connected to the plurality of sub-frames 311 .

[0103] The membrane 321 is a portion of the binding member 32 used to connect the sub-frame 311. The membrane 321 is illustratively a component of a membrane structure.

[0104] The hollow area 321A is a gap or hole area formed by removing part of the material on the membrane 321 .

[0105] In this embodiment, the diaphragm 321 is provided with a hollow area 321A, and the diaphragm 321 is connected to multiple sub-frames 311, thereby reducing the volume of the diaphragm 321 and the weight of the buffer assembly 30 compared to the case where the diaphragm 321 does not have the hollow area 321A, thereby reducing the weight of the battery device 100.

[0106] According to some embodiments of the present application, the thickness of the membrane 321 is 50-100 μm.

[0107] The thickness of the membrane 321 refers to the dimension of the membrane 321 in the first direction X.

[0108] The thickness of the diaphragm 321 can be any point value among 50μm, 51μm, 52μm, 53μm, 54μm, 55μm, 56μm, 57μm, 58μm, 59μm, 60μm, 70μm, 80μm, 90μm, 100μm, etc., or a range value between any two of them.

[0109] In this embodiment, when the thickness of the diaphragm 321 is greater than 50 μm, the diaphragm 321 has a certain structural strength, thereby reducing the risk of the restraining member 32 breaking when transmitting the squeezing force of the battery cell 20 on the sub-frame 311; when the thickness of the diaphragm 321 is less than 100 μm, the volume of the diaphragm 321 can be reduced and then the weight of the diaphragm 321 can be reduced, thereby reducing the weight of the buffer assembly 30 and further reducing the weight of the battery device 100; therefore, when the thickness of the diaphragm 321 is 50~100 μm, the diaphragm 321 can have a certain structural strength, thereby reducing the risk of the restraining member 32 breaking when transmitting the squeezing force of the battery cell 20 on the sub-frame 311, and can also reduce the weight of the diaphragm 321, thereby reducing the weight of the buffer assembly 30 and further reducing the weight of the battery device 100.

[0110] According to some embodiments of this application, please refer to Figure 5-Figure 8 The diaphragm 321 includes a main body 3211 and a plurality of extension portions 3212 extending from the edge of the main body 3211; in the same projection plane perpendicular to the first direction X, the orthographic projection of the frame 31 surrounds the orthographic projection of the main body 3211; the plurality of extension portions 3212 are arranged at intervals along the circumference of the frame 31, and a hollow area 321A is formed between two adjacent extension portions 3212, and the extension portions 3212 are connected to the sub-frame 311.

[0111] The main body portion 3211 is a portion of the diaphragm 321 used to connect the plurality of extension portions 3212 .

[0112] The extension portion 3212 is a portion of the membrane 321 used for connecting with the sub-frame 311 .

[0113] It can be understood that the connection of the plurality of extension portions 3212 through the main body portion 3211 increases the integrity of the diaphragm 321 and facilitates the processing and assembly of the diaphragm 321 compared to the case where the diaphragm 321 only includes the extension area.

[0114] In some embodiments, the extension portion 3212 may be bonded to the sub-frame 311 by bonding.

[0115] In this embodiment, the extension portion 3212 is connected to the sub-frame 311, and multiple extension portions 3212 are arranged at circumferential intervals along the frame 31, so that the diaphragm 321 can more evenly limit the outward deformation of the sub-frame 311 through the multiple extension portions 3212, thereby making the sub-frame 311 more evenly stressed.

[0116] According to some embodiments of this application, please refer to Figure 5-Figure 7 The restraining member 32 also includes an outer ring 322, which is arranged around the outer periphery of the frame 31; the restraining member 32 includes two diaphragms 321, which are respectively arranged on opposite sides of the frame 31 along the first direction X, and the end of the extension portion 3212 away from the main body portion 3211 is connected to the outer ring 322; the frame 31 is bonded to the battery cell 20.

[0117] The outer ring 322 is a portion of the restraining member 32 that is disposed around the outer circumference of the frame 31 .

[0118] It can be understood that the outer ring 322 can limit the portion of the sub-frame 311 not connected to the extension portion 3212 from deforming outward when subjected to the extrusion force of the battery cell 20. At the same time, the outer ring 322 can connect the two diaphragms 321, thereby improving the integrity of the binding member 32.

[0119] In some embodiments, the extension portion 3212 is bonded to the side of the frame 31 facing the battery cell 20 , the inner wall of the outer ring 322 can be bonded to the outer peripheral side of the frame 31 , and the end of the extension portion 3212 away from the main body 3211 is connected to the outer ring 322 .

[0120] Exemplarily, the diaphragm 321 can be used as release paper, and a notch is provided on the diaphragm 321. During the installation of the buffer assembly 30, part of the diaphragm 321 can be torn off along the notch on the diaphragm 321 to form a hollow area 321A, so that the frame 31 can be bonded to the battery cell 20 through the hollow area 321A.

[0121] In this embodiment, on the one hand, the outer ring 322 is arranged on the outer periphery of the frame 31, and the restraining member 32 includes two diaphragms 321, which are respectively arranged on opposite sides of the frame 31 along the first direction X, so that the diaphragm 321 can limit the outward deformation of the sub-frame 311 through the outer ring 322, thereby improving the reliability of the battery device 100; on the other hand, the buffer assembly 30 is bonded to the battery cell 20, and the diaphragm 321 is provided with a hollow area 321A, so that the sub-frame 311 can be bonded to the battery cell 20 through the hollow area 321A. At the same time, since the multiple extension portions 3212 are arranged at intervals along the circumference of the frame 31, a hollow area 321A is formed between two adjacent extension portions 3212, so that the sub-frame 311 can be more evenly bonded to the battery cell 20, thereby increasing the stability of the bonding between the sub-frame 311 and the battery cell 20.

[0122] According to some embodiments of the present application, the diaphragm 321 and the outer ring 322 are integrally formed.

[0123] In some embodiments, one side of the outer ring 322 may be connected to only one of the two membranes 321 , so that the frame 31 can be placed inside the two membranes 321 through the gap between the side of the outer ring 322 and the other membrane 321 in the first direction X.

[0124] In this embodiment, the diaphragm 321 and the outer ring 322 are integrally formed, thereby increasing the stability of the connection between the diaphragm 321 and the outer ring 322, thereby reducing the risk of breakage at the connection between the diaphragm 321 and the outer ring 322 when the restraining member 32 restricts the sub-frame 311 from deforming outward, thereby improving the reliability of the battery device 100.

[0125] According to some embodiments of this application, please refer to Figure 8 and Fig. 9 , Fig. 9 for Figure 8 The sub-frame 311 is provided with a through hole 3111 for the extension part 3212 to pass through; the diaphragm 321 also includes a limiting part 3213, which is provided at one end of the extension part 3212 away from the main body part 3211, and is used to limit the extension part 3212 from being separated from the through hole 3111. Along the first direction X, the thickness of the limiting part 3213 is greater than the thickness of the extension part 3212.

[0126] The through hole 3111 is a hole-shaped structure that completely penetrates the sub-frame 311 to allow the extension portion 3212 to pass through. Exemplarily, the axis of the through hole 3111 is perpendicular to the extension direction of the sub-frame 311 having the through hole 3111 and the first direction X.

[0127] It can be understood that when the through hole 3111 is located in the first sub-frame 311A ​​and the third sub-frame 311C, the axis of the through hole 3111 is parallel to the second direction Y; when the through hole 3111 is located in the second sub-frame 311B and the fourth sub-frame 311D, the axis of the through hole 3111 is parallel to the first direction X.

[0128] The limiting portion 3213 is a portion of the diaphragm 321 used to limit the extension portion 3212 from being separated from the through hole 3111 .

[0129] In some embodiments, the thickness of the limiting portion 3213 is greater than the thickness of the extending portion 3212 , and the limiting portion 3213 is located outside the frame 31 , and the limiting portion 3213 abuts against the outer peripheral side of the frame 31 to limit the extending portion 3212 from escaping from the through hole 3111 .

[0130] In some embodiments, the thickness of the limiting portion 3213 is greater than the thickness of the extending portion 3212 , and the limiting portion 3213 is located in the through hole 3111 , and the limiting portion 3213 and the through hole 3111 are interference fit to limit the extending portion 3212 from being separated from the through hole 3111 .

[0131] In this embodiment, the extending portion 3212 is limited from being separated from the through hole 3111 by the limiting portion 3213, thereby limiting the outward deformation of the sub-frame 311, and the structure is simple and easy to implement.

[0132] According to some embodiments of this application, please refer to Figure 8 and Fig. 9 The through hole 3111 includes a first hole segment 3111A and a second hole segment 3111B. The cross-sectional area of ​​the first hole segment 3111A is greater than the cross-sectional area of ​​the second hole segment 3111B. A step surface 3112 is formed between the first hole segment 3111A and the second hole segment 3111B. The limiting portion 3213 is at least partially disposed on the first hole segment 3111A and abuts against the step surface 3112. The extending portion 3212 is at least partially disposed on the second hole segment 3111B.

[0133] The first hole section 3111A is the portion that connects the through hole 3111 with the side surface of the sub-frame 311 located outside the frame 31 .

[0134] The second hole section 3111B is the portion that connects the through hole 3111 with the side surface of the sub-frame 311 located inside the frame 31 .

[0135] In the embodiment where the axis of the through hole 3111 is parallel to the second direction Y, Fig. 9, the cross-sectional area of ​​the first hole segment 3111A is greater than the cross-sectional area of ​​the second hole segment 3111B, so that the size of the first hole segment 3111A in the first direction X is greater than the size of the second hole segment 3111B in the first direction X, and / or, the size of the first hole segment 3111A in the third direction Z is greater than the size of the second hole segment 3111B in the third direction Z, so that a step surface 3112 is formed between the first hole segment 3111A and the second hole segment 3111B, and the limiting portion 3213 abuts against the step surface 3112 along the second direction Y, so that when the sub-frame 311 is subjected to the extrusion force of the battery cell 20 and is deformed in the second direction Y so that the extension portion 3212 tends to be separated from the through hole 3111, the limiting portion 3213 can abut against the step surface 3112 to limit the sub-frame 311 from deforming outward along the second direction Y.

[0136] In some embodiments, one end of the extension portion 3212 close to the main body is bonded to the main body.

[0137] In this embodiment, the limiting portion 3213 is at least partially disposed in the first hole segment 3111A and abuts against the step surface 3112, and the extending portion 3212 is at least partially disposed in the second hole segment 3111B. Therefore, when the sub-frame 311 tends to deform outward, the limiting portion 3213 abuts against the step surface 3112. As a result, relative to the situation where the friction force between the limiting portion 3213 and the through hole 3111 limits the outward deformation of the sub-frame 311, the abutment force generated by the abutment between the limiting portion 3213 and the step surface 3112 limits the outward deformation of the sub-frame 311, which can reduce the risk of the sub-frame 311 detaching from the diaphragm 321 and deforming outward, thereby improving the reliability of the battery device 100.

[0138] An embodiment of the present application provides an electrical device, including the above-mentioned battery device 100, and the battery device 100 is used to provide electrical energy.

[0139] According to some embodiments of this application, please refer to Figure 2-Figure 7The present application provides a battery device 100, including a plurality of battery cells 20 and a buffer assembly 30; the plurality of battery cells 20 are arranged along a first direction X; the buffer assembly 30 is disposed between two adjacent battery cells 20, the buffer assembly 30 includes a frame 31 and a restraining member 32, the frame 31 includes a plurality of sub-frames 311 connected end to end; wherein the buffer assembly 30 further includes a restraining member 32, the restraining member 32 is connected to the plurality of sub-frames 311 to limit the outward deformation of the sub-frames 311. The material of the restraining member 32 is PET. The restraining member 32 includes a diaphragm 321, the diaphragm 321 is provided with a hollow area 321A, and the diaphragm 321 is connected to the plurality of sub-frames 311. The thickness of the diaphragm 321 is 50~100μm. The diaphragm 321 includes a main body 3211 and a plurality of extensions 3212 extending from the edge of the main body 3211; in the same projection plane perpendicular to the first direction X, the orthographic projection of the frame 31 surrounds the orthographic projection of the main body 3211; the plurality of extensions 3212 are arranged at intervals along the circumference of the frame 31, and a hollow area 321A is formed between two adjacent extensions 3212, and the extensions 3212 are connected to the sub-frame 311. The binding member also includes an outer ring 322, which is arranged around the outer periphery of the frame 31; the binding member 32 includes two diaphragms 321, which are respectively arranged on opposite sides of the frame 31 along the first direction X, and one end of the extension 3212 away from the main body 3211 is connected to the outer ring 322; the frame 31 is bonded to the battery cell 20. The diaphragm 321 and the outer ring 322 are integrally formed.

[0140] According to some embodiments of this application, please refer to Figure 2-Figure 4 , and refer to Figure 8 and Fig. 9The present application provides a battery device 100, including a plurality of battery cells 20 and a buffer assembly 30; the plurality of battery cells 20 are arranged along a first direction X; the buffer assembly 30 is disposed between two adjacent battery cells 20, the buffer assembly 30 includes a frame 31 and a restraining member 32, the frame 31 includes a plurality of sub-frames 311 connected end to end; wherein the buffer assembly 30 further includes a restraining member 32, the restraining member is connected to the plurality of sub-frames 311 to limit the outward deformation of the sub-frames 311. The material of the restraining member 32 is PET. The restraining member 32 includes a diaphragm 321, the diaphragm 321 is provided with a hollow area 321A, and the diaphragm 321 is connected to the plurality of sub-frames 311. The thickness of the diaphragm 321 is 50~100μm. The diaphragm 321 includes a main body 3211 and a plurality of extensions 3212 extending from the edge of the main body 3211; in the same projection plane perpendicular to the first direction X, the orthographic projection of the frame 31 surrounds the orthographic projection of the main body 3211; the plurality of extensions 3212 are arranged at intervals along the circumference of the frame 31, and a hollow area 321A is formed between two adjacent extensions 3212, and the extensions 3212 are connected to the sub-frame 311. The sub-frame 311 is provided with a through hole 3111 for the extensions 3212 to pass through; the diaphragm 321 also includes a limiting portion 3213, which is arranged at one end of the extension 3212 away from the main body 3211, and the limiting portion 3213 is used to limit the extension 3212 from being separated from the through hole 3111. Along the first direction X, the thickness of the limiting portion 3213 is greater than the thickness of the extension 3212. The through hole 3111 includes a first hole segment 3111A and a second hole segment 3111B, the cross-sectional area of ​​the first hole segment 3111A is larger than the cross-sectional area of ​​the second hole segment 3111B, and a step surface 3112 is formed between the first hole segment 3111A and the second hole segment 3111B; the limiting portion 3213 is at least partially disposed in the first hole segment 3111A and abuts against the step surface 3112, and the extending portion 3212 is at least partially disposed in the second hole segment 3111B.

[0141] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0142] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A plurality of battery cells are arranged along a first direction; A buffer assembly is arranged between two adjacent battery cells, wherein the buffer assembly comprises a frame, and the frame comprises a plurality of sub-frames connected end to end; Wherein, the buffer assembly further includes a restraining member, and the restraining member is connected to at least two of the plurality of sub-frames to limit outward deformation of the sub-frames.

2. The battery device according to claim 1, characterized in that The restraining member is made of insulating material.

3. The battery device according to claim 2, characterized in that: The material of the restraining member is PET.

4. The battery device according to claim 1, wherein: The binding member is connected to at least two of the sub-frames that are arranged opposite to each other.

5. The battery device according to claim 1, wherein: The binding member is connected to all of the plurality of sub-frames.

6. The battery device according to claim 5, characterized in that The binding member includes a diaphragm, the diaphragm is provided with a hollow area, and the diaphragm is connected to the multiple sub-frames.

7. The battery device according to claim 6, characterized in that: The thickness of the membrane is 50-100 μm.

8. The battery device according to claim 6, characterized in that: The diaphragm comprises a main body and a plurality of extensions extending from the edge of the main body; In the same projection plane perpendicular to the first direction, the orthographic projection of the frame surrounds the orthographic projection of the main body; A plurality of the extension portions are arranged at intervals along the circumference of the frame, and the hollow area is formed between two adjacent extension portions. The extension portions are connected to the sub-frame.

9. The battery device according to claim 8, characterized in that: The restraining member further comprises an outer ring, and the outer ring is arranged around the outer periphery of the frame; The binding member comprises two diaphragms, which are respectively arranged on opposite sides of the frame along the first direction, and one end of the extension portion away from the main body portion is connected to the outer ring; The frame is bonded to the battery cell.

10. The battery device according to claim 9, characterized in that The diaphragm and the outer ring are integrally formed.

11. The battery device according to claim 8, characterized in that: The sub-frame is provided with a through hole for the extension portion to pass through; The diaphragm further comprises a limiting portion, which is arranged at one end of the extension portion away from the main body portion, and is used to limit the extension portion from being separated from the through hole; Along the first direction, the thickness of the limiting portion is greater than the thickness of the extending portion.

12. The battery device according to claim 11, characterized in that The through hole comprises a first hole segment and a second hole segment, the cross-sectional area of ​​the first hole segment is larger than the cross-sectional area of ​​the second hole segment, and a step surface is formed between the first hole segment and the second hole segment; The limiting portion is at least partially disposed in the first hole section and abuts against the step surface, and the extending portion is at least partially disposed in the second hole section.

13. An electrical device, characterized in that: The invention comprises a battery device according to any one of claims 1 to 12, wherein the battery device is used to provide electrical energy.

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