Battery cell, buffer, battery device, and electric device

Abstract

The utility model discloses a battery monomer, a buffer piece, a battery device and a power utilization device. The battery monomer comprises a shell, a buffer piece and a battery, the electrode assembly is arranged in the shell; the buffer part is arranged in the shell and comprises two supporting plates and a telescopic structure, the two supporting plates are arranged at intervals in the first direction, the first direction is the thickness direction of the electrode assembly, and at least one supporting plate abuts against the electrode assembly in the first direction; the telescopic structure is connected between the two supporting plates and can stretch out and draw back in the first direction. In the technical mode, the buffer piece can reduce the occupied space in the shell, increase the arrangement space of the electrode assembly and the electrolyte, improve the charging amount of the electrode liquid, remarkably reduce the adsorption amount of the electrode liquid, and improve the amount of the electrolyte which can effectively participate in the charging and discharging process of the battery monomer; therefore, the energy density, the cycle life and the overall reliability of the battery monomer are improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a buffer, a battery device, and an electrical device. Background Technology

[0002] In the development of battery technology, the performance and reliability of battery devices have always been key research areas, and the design of buffer structures plays a crucial role in this process. Currently, many battery cells use built-in buffer pads as a buffer structure in their design. However, the built-in buffer pad structures in existing technologies occupy a large volume, affecting the energy density, cycle life, and reliability of the battery device.

[0003] Application content

[0004] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a battery cell, and a battery device and an electrical device including the battery cell. The battery cell can reduce the space occupied by the buffer in the housing and increase the amount of electrode liquid filled, thereby improving the energy density, cycle life and overall reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, comprising: a housing; an electrode assembly disposed within the housing; and a buffer member disposed within the housing, the buffer member comprising a support plate and a telescopic structure, wherein there are two support plates, the two support plates are arranged at a distance in a first direction, the first direction being the thickness direction of the electrode assembly, at least one support plate abuts against the electrode assembly in the first direction, and the telescopic structure is connected between the two support plates and is telescopic along the first direction.

[0006] In the above-mentioned technical approach, since the buffer component of the battery cell includes two support plates and a telescopic structure connected between the two support plates and extendable along a first direction, the support plates can increase the contact area with the electrode assembly, evenly distribute stress, and effectively reduce the risk of stress concentration in the electrode assembly. The telescopic structure, through its extension and contraction along the first direction, can effectively absorb and mitigate the external impact force and expansion force of the electrode assembly on the battery cell, providing reliable and stable support and buffering for the electrode assembly. At the same time, the telescopic structure does not need to completely fill the space between the two support plates, thereby reducing the space occupied in the casing, increasing the arrangement space of the electrode assembly and electrolyte, increasing the electrode electrolyte filling volume, significantly reducing the amount of electrode electrolyte adsorbed, and increasing the amount of electrolyte that can effectively participate in the charging and discharging process of the battery cell, thereby improving the energy density, cycle life, and overall reliability of the battery cell.

[0007] In some embodiments, the projected area of ​​the telescopic structure is smaller than the projected area of ​​the support plate in a projection plane perpendicular to the first direction.

[0008] In the above technical solution, by making the projected area of ​​the telescopic structure in the projection plane perpendicular to the first direction smaller than the projected area of ​​the support plate, the buffer can effectively buffer the electrode assembly along the first direction while reducing the space occupied by the telescopic structure, leaving more space for the electrolyte and electrode assembly in the shell, increasing the amount of electrode liquid filled, increasing the amount of electrolyte that can effectively participate in the charging and discharging process of the battery cell, thereby improving the energy density and cycle life of the battery cell.

[0009] In some embodiments, the telescopic structure includes one or more telescopic members, each of which is connected to two support plates at both ends.

[0010] In the above technical solution, since the telescopic structure includes one or more telescopic components, and each telescopic component is connected to two support plates at both ends, the elastic coefficient, buffering effect and space occupied by the buffer can be adjusted by adjusting the number of telescopic components.

[0011] In some embodiments, the telescopic structure includes a plurality of telescopic members, which are spaced apart along a second direction and / or a third direction, and the first direction, the second direction and the third direction intersect each other.

[0012] In the above technical solution, since multiple telescopic components are arranged at intervals along the second direction and / or the third direction, the support plate can disperse stress in the second direction and / or the third direction through multiple telescopic components, reduce the risk of local stress concentration, improve the buffer performance of the buffer component, and the space occupied between the multiple telescopic components can further reduce the space occupied between the two support plates, increase the amount of electrode liquid filled, thereby improving the energy density and cycle life of the battery cell.

[0013] In some embodiments, two of the plurality of telescopic members are respectively arranged at both ends of the support plate in a second direction or a third direction.

[0014] In the above technical solution, since two of the telescopic components are respectively arranged at both ends of the support plate in the second or third direction, they can not only support and buffer the edge of the support plate, reducing the probability of damage to the edge of the support plate, but also make the stress distribution of the support plate supported and buffered by multiple telescopic components in the second or third direction more uniform, reducing the probability of local stress concentration and improving the stability of the electrode assembly.

[0015] In some embodiments, the number of telescopic members is at least three, and one of the multiple telescopic members is arranged at the center of the support plate in the second or third direction.

[0016] In the above technical solution, three telescopic components are respectively arranged at both ends and the middle of the support plate in the second or third direction. This allows the support plate to buffer and support the electrode assembly in all directions along the second or third direction, so that the force can be evenly distributed and the force uniformity and buffering stability of the electrode assembly can be improved.

[0017] In some embodiments, the two ends of the telescopic member are rotatably connected to two support plates, respectively.

[0018] In the above technical solution, since the two ends of the telescopic component are rotatably connected to the two support plates, the relative angle between the telescopic component and the support plates can be adjusted by rotating the two ends of the telescopic component relative to the support plates, thereby adjusting the distance between the two support plates in the first direction. This allows the buffer component to extend and retract along the first direction. At the same time, the telescopic component can be made of a rigid material, reducing the space occupied by the telescopic component, reducing the amount of electrolyte adsorbed by the telescopic component, and increasing the amount of electrode liquid filled, thereby improving the energy density, cycle life and overall reliability of the battery cell.

[0019] In some embodiments, the telescopic member is formed as a support rod in the shape of a rod.

[0020] In the above technical solution, since the telescopic component is formed into a support rod in the shape of a rod, the support rod can not only provide stable support for the two support plates and improve the support and buffering effect on the electrode assembly, but also has a simple structure and is easy to assemble, which helps to reduce production costs and improve assembly efficiency. In addition, the support rod occupies little space, which can leave more space for other components such as electrolyte, thereby improving the overall performance of the battery cell.

[0021] In some embodiments, the telescopic member includes a cross unit, which includes two connecting rods that are cross-connected and rotatably connected, with both ends of the two connecting rods rotatably connected to two support plates respectively.

[0022] In the above technical solution, the telescopic component includes a cross unit consisting of two cross-arranged and rotatably connected links. The cross unit has more flexible telescopic movement in the first direction and good stability. It can effectively absorb and buffer energy, reduce the risk of damage to the electrode assembly, and the cross unit has a compact structure and occupies little space, which can improve the overall performance and energy density of the battery cell.

[0023] In some embodiments, the telescopic member includes a cross unit, or the telescopic member includes a plurality of cross units connected sequentially along a first direction.

[0024] In the above technical solution, since the telescopic component includes one or multiple cross units connected sequentially along the first direction, the number of cross units of the telescopic component can be set according to the performance of the electrode assembly and the environmental requirements of the battery device, so that the telescopic component can reduce space occupation and improve the energy density and overall performance of the battery cell while meeting the buffer performance requirements.

[0025] In some embodiments, the telescopic member is riveted to the support plate.

[0026] In the above technical solution, since the telescopic component is riveted to the support plate, the connection reliability between the telescopic component and the support plate can be improved, and the buffer component can effectively withstand the stress and impact generated by the battery cell during operation. At the same time, the riveting connection process is simple, low-cost, and easy to operate, which can reduce costs and improve assembly efficiency.

[0027] In some embodiments, the telescopic component is a polycarbonate component, an engineering plastic alloy component, a polyphenylene ether component, or a polyvinyl chloride component.

[0028] In the above technical solution, the telescopic component is made of polycarbonate, engineering plastic alloy, polyphenylene ether, or polyvinyl chloride. This can improve the strength and toughness of the telescopic component, enabling it to provide cushioning without easily breaking. It can also improve the corrosion resistance and chemical stability of the telescopic component, extending its service life. In addition, it can make the telescopic component easier to process and form, reducing costs and improving the overall quality and economy of the battery cell.

[0029] In some embodiments, the telescopic member is an elastic member extending along a first direction, and the telescopic member is elastically deformable along the first direction.

[0030] In the above technical solution, since the telescopic component can elastically deform along the first direction, when the battery cell is subjected to vibration, impact, or changes in the volume of the electrode assembly, the telescopic component can absorb and disperse energy through elastic deformation, reducing the impact force on the electrode assembly and protecting the electrode assembly from damage. At the same time, the elastic component can automatically reset, and when the volume of the electrode assembly changes repeatedly, the elastic component can adapt to the volume changes of the electrode assembly, so that the buffer component can always support the electrode assembly and maintain the structural stability inside the battery cell.

[0031] In some embodiments, the telescopic member extends into a long strip along a second direction or a third direction, with the first direction, the second direction, and the third direction intersecting each other.

[0032] In the above technical solution, since the telescopic component is formed as an elastic component and extends into a long strip shape in a plane perpendicular to the first direction, the elastic component can not only provide support and buffering for the electrode assembly in the first direction, but also provide support and buffering for the electrode assembly when the battery cell is subjected to impact forces in the second or third direction, thereby improving the protection effect of the electrode assembly. In addition, the long strip shape of the elastic component can increase the contact area with the support plate, improve the uniformity of force distribution, and reduce the risk of stress concentration.

[0033] In some embodiments, the telescopic member extends along a second direction and its two ends are respectively flush with the two end edges of the support plate in the second direction; or, the telescopic member extends along a third direction and its two ends are respectively flush with the two side edges of the support plate in the third direction.

[0034] In the above technical solution, since the two ends of the telescopic component are flush with the two ends of the support plate in the extension direction, the telescopic component can fully cover the support plate in the extension direction of the telescopic component, so that the force between the support plate and the telescopic component is evenly distributed in the extension direction of the telescopic component, improving the uniformity of the force, reducing stress concentration, and also not occupying additional space beyond the periphery of the support plate, reducing space occupation and improving the energy density of the battery cell.

[0035] In some embodiments, the telescopic member is arranged between two support plates, and the projection of the telescopic member is entirely within the projection of the support plates; or, at least a portion of the telescopic member is arranged on both sides of the two support plates in a second or third direction.

[0036] In the above technical solution, by ensuring that the projection of the telescopic component along the first direction is entirely within the projection range of the support plate, the telescopic component does not need to occupy space beyond the outer side of the support plate, reducing interference between the telescopic component and other components within the housing, and improving the energy density and stability of the battery cell. Furthermore, by distributing at least a portion of the telescopic component on both sides of the support plate, the contact area between the buffer component and the electrode assembly can be increased, further dispersing stress, reducing the probability of stress concentration, and improving the service life of the battery cell.

[0037] In some embodiments, the two ends of the telescopic member are bonded to the support plate.

[0038] In the above technical solution, by bonding the two ends of the telescopic component to the support plate, the bonding operation is simple, which can reduce assembly costs and improve assembly efficiency. Furthermore, the contact and fit between the telescopic component and the support plate surface can evenly distribute stress and enhance the buffering effect.

[0039] In some embodiments, the telescopic component is a polypropylene component, a polyethylene component, a polyester fiber component, or a melamine component.

[0040] In the above technical solutions, since the expansion joints are made of polypropylene, polyethylene, polyester fiber, or melamine, their chemical stability and corrosion resistance can be improved, reducing the probability of them being corroded by electrolytes and extending their service life. Furthermore, the strength and toughness of the expansion joints can be enhanced, improving the cushioning effect. In addition, the material and processing costs of the expansion joints can be reduced, and production efficiency can be improved.

[0041] In some embodiments, the support plate is a polycarbonate component, an engineering plastic alloy component, a polyphenylene ether component, or a polyvinyl chloride component.

[0042] In the above technical solution, by making the support plate a polycarbonate part, an engineering plastic alloy part, a polyphenylene ether part, or a polyvinyl chloride part, the strength and toughness of the support plate can be improved, so that the support plate can not only provide cushioning but also be less prone to breakage. It can also improve the corrosion resistance and chemical stability of the support plate and extend its service life. In addition, it can make the support plate easier to process and form, reduce costs, and improve the overall quality and economy of the battery cell.

[0043] In some embodiments, the support plate is a polypropylene component, a polyethylene component, a polyester fiber component, or a melamine component.

[0044] In the above technical solution, since the support plate is made of polypropylene, polyethylene, polyester fiber, or melamine, its chemical stability and corrosion resistance can be improved, reducing the probability of the support plate being corroded by the electrolyte, extending its service life, and also improving its strength and toughness, thus enhancing the cushioning effect of the buffer component. Furthermore, it can reduce the material and processing costs of the support plate and improve production efficiency.

[0045] In some embodiments, the buffer can be switched between an initial state and a compressed state. In the initial state, the distance between the opposing surfaces of the two support plates in a first direction is a first dimension. In the compressed state, the distance between the opposing surfaces of the two support plates is a second dimension, and the ratio of the second dimension to the first dimension is greater than or equal to 0.5 and less than or equal to 0.8.

[0046] In the above technical solution, since the compression ratio of the buffer is between 0.5 and 0.8, the buffer can effectively buffer the electrode assembly, reduce the risk of the electrode assembly being over-compressed, improve the stability of the internal structure of the battery cell, and enable the buffer to adapt to various actual working conditions, so that the battery cell can work stably under various conditions.

[0047] In some embodiments, there are multiple electrode assemblies, which are stacked along a first direction, and a buffer is disposed between two adjacent electrode assemblies.

[0048] In the above technical solution, since the buffer is located between the two electrode assemblies, it can effectively buffer the stress generated by the expansion between adjacent electrode assemblies, reduce the probability of the electrode assemblies squeezing each other, and extend the service life of the battery cells. It can also absorb and disperse external impact forces on the battery cells, reducing the impact on the electrode assemblies and decreasing the probability of faults such as internal short circuits within the battery cells. Furthermore, the buffer can isolate adjacent electrode assemblies, reducing heat transfer between them and lowering the probability of short circuits between adjacent electrode assemblies.

[0049] In some embodiments, the housing is cuboid in shape and the electrode assembly is a wound electrode assembly.

[0050] In the above technical solution, the shell is rectangular and the electrode assembly is a wound electrode assembly, which can make the electrode assembly adapt to the shape of the shell, improve the energy density of the battery cell, and the battery cells with square shells are stacked in the battery device box, which can improve the energy density of the battery device.

[0051] Secondly, embodiments of this application provide a buffer, which is a buffer in a battery cell according to the first aspect of this application.

[0052] In the above-mentioned technical approach, since the buffer includes two support plates and a telescopic structure connected between the two support plates and extendable along the first direction, the support plates can increase the contact area with the electrode assembly, evenly distribute stress, and effectively reduce the risk of stress concentration in the electrode assembly. The telescopic structure, through its extension and contraction along the first direction, can effectively absorb and mitigate the external impact force on the battery cell and the expansion force of the electrode assembly, providing reliable and stable support and buffering for the electrode assembly. At the same time, the telescopic structure does not need to completely fill the space between the two support plate brackets, thereby reducing the space occupied in the casing, increasing the arrangement space of the electrode assembly and electrolyte, increasing the electrode liquid filling volume, significantly reducing the amount of electrode liquid adsorbed, and increasing the amount of electrolyte that can effectively participate in the charging and discharging process of the battery cell, thereby improving the energy density, cycle life and overall reliability of the battery cell.

[0053] Thirdly, embodiments of this application provide a battery device comprising a battery cell according to the first aspect of this application.

[0054] In the above embodiments, by setting the battery cell of the first aspect, and since the buffer of the battery cell includes two support plates and a telescopic structure connected between the two support plates and extendable along the first direction, the support plates can increase the contact area with the electrode assembly, evenly distribute stress, and effectively reduce the risk of stress concentration in the electrode assembly. The telescopic structure, through its telescopic deformation along the first direction, can effectively absorb and mitigate the external impact force and expansion force of the electrode assembly on the battery cell, providing reliable and stable support and buffer for the electrode assembly. At the same time, the telescopic structure does not need to completely fill the space between the two support plate brackets, thereby reducing the space occupied in the housing, increasing the arrangement space of the electrode assembly and electrolyte, increasing the electrode liquid filling amount, significantly reducing the amount of electrode liquid adsorbed, and increasing the amount of electrolyte that can effectively participate in the charging and discharging process of the battery cell, thereby improving the energy density, cycle life and overall reliability of the battery cell, and thus improving the energy density and overall reliability of the battery device.

[0055] Fourthly, embodiments of this application provide an electrical device, including a battery device according to the third aspect of this application.

[0056] In the above embodiments, by providing the battery device described in the third aspect, the overall performance of the power-consuming device is improved.

[0057] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of a vehicle according to an embodiment of this application;

[0059] Figure 2 This is an exploded view of a battery device according to an embodiment of this application;

[0060] Figure 3 This is a schematic diagram of a battery cell according to an embodiment of this application;

[0061] Figure 4 This is a schematic diagram of the electrode assembly and buffer of a battery cell according to an embodiment of this application;

[0062] Figure 5 yes Figure 4 Exploded view of the electrode assembly and buffer components;

[0063] Figure 6 This is a top view of the electrode assembly and buffer of a battery cell according to Embodiment 1 of this application;

[0064] Figure 7This is a top view of the electrode assembly and buffer of a battery cell according to Embodiment 2 of this application, wherein the buffer is in its initial state;

[0065] Figure 8 This is a top view of the electrode assembly and buffer of a battery cell according to Embodiment 2 of this application, wherein the buffer is partially compressed;

[0066] Figure 9 This is a top view of the electrode assembly and buffer of a battery cell according to Embodiment 2 of this application, wherein the buffer is in a compressed state;

[0067] Figure 10 This is a top view of the electrode assembly and buffer of a battery cell according to Embodiment 3 of this application, wherein the buffer is in its initial state;

[0068] Figure 11 yes Figure 10 The diagram shows the structure of the buffer component.

[0069] Figure 12 yes Figure 10 Side view of the electrode assembly and buffer shown;

[0070] Figure 13 This is a top view of the electrode assembly and buffer of a battery cell according to Embodiment 3 of this application, wherein the buffer is partially compressed;

[0071] Figure 14 yes Figure 13 Side view of the electrode assembly and buffer shown;

[0072] Figure 15 This is a top view of the electrode assembly and buffer of a battery cell according to Embodiment 3 of this application, wherein the buffer is in a compressed state;

[0073] Figure 16 This is a side view of the electrode assembly and buffer of a battery cell according to Embodiment 4 of this application;

[0074] Figure 17 yes Figure 16 The diagram shows the structure of the buffer component.

[0075] Figure 18 This is a top view of the electrode assembly and buffer of a battery cell according to Embodiment 5 of this application;

[0076] Figure 19 This is a side view of the buffer component of a battery cell according to Embodiment 5 of this application;

[0077] Figure 20 This is a side view of the electrode assembly and buffer of a battery cell according to Embodiment Six of this application;

[0078] Figure 21 This is a top view of the electrode assembly and buffer of a battery cell according to Embodiment 7 of this application, wherein the telescopic structure of the buffer is in its initial state.

[0079] Figure 22 yes Figure 21 The diagram shows the structure of the buffer component.

[0080] Figure 23 This is a top view of the electrode assembly and buffer of a battery cell according to Embodiment 7 of this application, wherein the telescopic structure of the buffer is in a compressed state.

[0081] Figure label:

[0082] 1. Electrical appliances;

[0083] 1000, Battery assembly; 2000, Controller; 3000, Motor;

[0084] 100. Battery cell; 10. Housing; 20. Electrode assembly; 30. Buffer component; 31. Support plate;

[0085] 32. Telescopic structure; 321. Telescopic component; 321a. Support rod; 321b. Elastic component;

[0086] 3211, Cross unit; 32111, Linkage rod; 400, Housing; 41, Housing body; 42, Cover plate;

[0087] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0088] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0089] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0090] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0091] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0092] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0093] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0094] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0095] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0096] The battery apparatus 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 one or more battery cells, and when there are multiple battery cells, they are connected in series, parallel, or mixed connections via a busbar.

[0097] 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 together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0098] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0099] 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.

[0100] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0101] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0102] 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.

[0103] 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.

[0104] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0105] The battery cells mentioned in the embodiments of this application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. Battery cells may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these shapes either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these types either.

[0106] For example, a single battery cell typically includes a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and the electrolyte, and the housing has at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive electrode sheets, negative electrode sheets, and separators.

[0107] The positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly soldered to the positive electrode post to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter piece. The multiple stacked positive electrode tabs are soldered to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece is soldered to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0108] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell assembly may also include a negative electrode adapter piece. The stacked negative electrode tabs are welded to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece is welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0109] Meanwhile, individual battery cells primarily function by the movement of metal ions between the positive and negative electrode plates. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, and the positive electrode active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon or silicon, etc. During charging and discharging, Li+ ions repeatedly insert and extract between the two electrodes: during charging, Li+ ions extract from the positive electrode, pass through the electrolyte, and insert into the negative electrode, leaving the negative electrode in a lithium-rich state; the reverse occurs during discharging.

[0110] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0111] In the development of battery technology, the performance and reliability of individual battery cells have always been key research areas, and the design of buffer structures plays a crucial role. Currently, many battery cells employ built-in buffer pads as a buffer structure; however, this traditional built-in buffer pad has several problems. Firstly, the built-in buffer pad is a solid volume material, and its physical properties dictate that it occupies a significant portion of the internal space of the battery cell. Because it occupies internal space, the electrolyte injection space is severely affected, leading to insufficient electrolyte injection into the battery cell during production. Since the electrolyte is crucial for the performance of the battery cell, serving as the medium for ion transport, its insufficiency directly impacts battery performance.

[0112] On the other hand, during the use of a battery cell, this built-in buffer pad continues to absorb liquid. This not only further reduces the effective electrolyte content, but also makes it difficult for the buffer pad to release the absorbed electrolyte after being compressed. The reduction in electrolyte affects the ion transport efficiency within the battery cell, thus impacting its cycle life and causing a faster performance decline after multiple charge-discharge cycles. Simultaneously, the volume change of the buffer pad after absorbing liquid and its difficulty in releasing the electrolyte can lead to uneven pressure distribution within the electrode assembly, generating additional expansion forces on the electrode assembly. This may cause problems such as battery cell deformation and casing bulging, severely affecting the reliability of the battery cell.

[0113] Therefore, the energy density, cycle life, and reliability of battery cells with built-in buffer pads in existing technologies need to be further improved.

[0114] Based on the above considerations, in order to improve the energy density, reliability, and stability of a single battery cell, this application designs a single battery cell. The buffer component of the single battery cell includes two support plates and a telescopic structure connected between the two support plates and extendable along a first direction. At least one support plate is used to abut against the electrode assembly. The support plates can increase the contact area with the electrode assembly, uniformly distribute stress, and effectively reduce the risk of stress concentration in the electrode assembly. The telescopic structure, through its extension and contraction along the first direction, can effectively absorb and mitigate the external impact force and expansion force of the electrode assembly on the single battery cell, providing reliable and stable support and buffering for the electrode assembly. At the same time, the telescopic structure does not need to completely fill the space between the two support plate supports, thereby reducing the space occupied in the casing, increasing the arrangement space of the electrode assembly and electrolyte, increasing the electrode electrolyte filling volume, significantly reducing the amount of electrode electrolyte adsorbed, and increasing the amount of electrolyte that can effectively participate in the charging and discharging process of the single battery cell, thereby improving the energy density, cycle life, and overall reliability of the single battery cell.

[0115] This application provides an electrical device that uses the battery cell disclosed herein as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0116] For ease of explanation, the following embodiments use a vehicle as an example to describe the structure of the electrical device 1, battery device 1000, and battery cell 100 of this application in detail.

[0117] Please refer to Figure 1 , Figure 1 The electrical device 1 provided in some embodiments of this application is a schematic diagram of a vehicle structure. The vehicle 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. The vehicle is equipped with a battery device 1000, which can be located at the bottom, front, or rear of the vehicle. The battery device 1000 can be used to supply power to the vehicle; for example, the battery device 1000 can serve as the vehicle's operating power source. The vehicle may also include a controller 2000 and a motor 3000. The controller 2000 controls the battery device 1000 to supply power to the motor 3000, for example, to meet the power needs of starting, navigation, and driving the vehicle. In some embodiments of this application, the battery device 1000 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0118] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device 1000 provided in some embodiments of this application. The battery device 1000 includes a housing 400 and a plurality of battery cells 100. The housing 400 provides assembly space for the battery cells 100, and the battery cells 100 are arranged in a rectangular stack within the housing 400 along its length and width. The housing 400 includes a main body 41 and a cover plate 42. The main body 41 is a cuboid shape with an open top, and the cover plate 42 covers the top of the main body 41, defining the assembly space in cooperation with the main body 41. The main body 41 and the cover plate 42 are detachably connected by fasteners. Further, a sealing element may be provided between the main body 41 and the cover plate 42. The sealing element extends in a ring shape along the circumference of the top opening of the main body 41, and the sealing element seals against the main body 41 and the cover plate 42.

[0119] The following is for reference. Figures 3-23 A battery cell 100 according to an embodiment of the first aspect of this application is described.

[0120] Please refer to Figure 3 , Figure 3 This is a schematic diagram of a battery cell 100 provided in some embodiments of this application. The battery cell 100 is rectangular in shape and includes a housing 10, an electrode assembly 20, a buffer 30, and an electrolyte. The electrode assembly 20 and the buffer 30 are disposed inside the housing 10 and are stacked in the thickness direction of the electrode assembly 20. The electrolyte fills the housing 10. Figure 4 This is a schematic diagram of the structure of the electrode assembly 20 and the buffer 30 of the battery cell 100 according to an embodiment of this application. The buffer 30 is disposed between the two electrode assemblies 20. Figure 5 yes Figure 4 Exploded view of electrode assembly 20 and buffer 30.

[0121] Figure 6 This is a top view of the electrode assembly 20 and the buffer member 30 of the battery cell 100 according to Embodiment 1 of this application. In Embodiment 1, the buffer member 30 includes two support plates 31 and a support rod 321a rotatably connected to the two support plates 31.

[0122] Figure 7 This is a top view of the electrode assembly 20 and the buffer 30 of the battery cell 100 according to Embodiment 2 of this application, wherein the buffer 30 is in the initial state. Figure 8 This is a top view of the electrode assembly 20 and the buffer 30 of the battery cell 100 according to Embodiment 2 of this application, wherein the buffer 30 is partially compressed. Figure 9This is a top view of the electrode assembly 20 and the buffer 30 of the battery cell 100 according to Embodiment 2 of this application, wherein the buffer 30 is in a compressed state. In Embodiment 2, the buffer 30 includes two support plates 31 and a plurality of support rods 321a rotatably connected to the two support plates 31, and the plurality of support rods 321a are spaced apart in the length direction of the battery cell 100.

[0123] Figure 10 This is a top view of the electrode assembly 20 and the buffer 30 of the battery cell 100 according to Embodiment 3 of this application, wherein the buffer 30 is in its initial state. Figure 11 yes Figure 10 A schematic diagram of the structure of the buffer 30 shown; Figure 12 yes Figure 10 Side view of electrode assembly 20 and buffer 30 shown; Figure 13 This is a top view of the electrode assembly 20 and the buffer 30 of the battery cell 100 according to Embodiment 3 of this application, wherein the buffer 30 is partially compressed. Figure 14 yes Figure 13 Side view of electrode assembly 20 and buffer 30 shown; Figure 15 yes Figure 14 The diagram shows a top view of the electrode assembly 20 and the buffer 30, wherein the buffer 30 is in a compressed state. In Embodiment 3, the buffer 30 includes two support plates 31 and a plurality of cross units 3211 rotatably connected to the two support plates 31, the plurality of cross units 3211 being arranged at intervals along the height direction of the battery cell 100.

[0124] Figure 16 This is a side view of the electrode assembly 20 and the buffer 30 of the battery cell 100 according to Embodiment 4 of this application; Figure 17 yes Figure 16 The diagram shows the structure of the buffer 30. In embodiment four, the buffer 30 includes two support plates 31 and a plurality of cross units 3211 rotatably connected to the two support plates 31. The plurality of cross units 3211 are arranged at intervals along the length direction of the battery cell 100.

[0125] Figure 18 This is a top view of the electrode assembly 20 and the buffer 30 of the battery cell 100 according to Embodiment 5 of this application; Figure 19 This is a side view of the buffer 30 of the battery cell 100 according to Embodiment 5 of this application; Figure 20This is a side view of the electrode assembly 20 and the buffer 30 of the battery cell 100 according to Embodiment Six of this application; in Embodiments Five and Six, the buffer 30 includes two support plates 31 and a plurality of telescopic members 321 rotatably connected to the two support plates 31. The plurality of telescopic members 321 are arranged at intervals, and each telescopic member 321 includes a plurality of cross units 3211 sequentially connected along the thickness direction of the battery cell 100.

[0126] Figure 21 This is a top view of the electrode assembly 20 and the buffer 30 of the battery cell 100 according to Embodiment 7 of this application, wherein the buffer 30 is in its initial state. Figure 22 yes Figure 21 The diagram shows the structure of the buffer 30. Figure 23 This is a top view of the electrode assembly 20 and the buffer 30 of the battery cell 100 according to Embodiment 7 of this application, wherein the buffer 30 is in a compressed state.

[0127] This application provides an embodiment of a battery cell 100, such as... Figures 3-5 As shown, the battery cell 100 includes: a housing 10, an electrode assembly 20, and a buffer 30. The electrode assembly 20 is disposed within the housing 10. The buffer 30 is disposed within the housing 10 and includes a support plate 31 and a telescopic structure 32. There are two support plates 31, which are arranged at intervals in a first direction X, which is the thickness direction of the electrode assembly 20. At least one support plate 31 abuts against the electrode assembly 20 in the first direction X. The telescopic structure 32 is connected between the two support plates 31 and is telescopic along the first direction X.

[0128] In some examples, such as Figure 3 As shown, the housing 10 is rectangular in shape. Specifically, the housing 10 may include a housing body and an end cap. The housing body is rectangular in shape and defines a cavity with one side open. The end cap covers the open side of the housing body and is sealed to the housing body. The electrode assembly 20 and the buffer 30 are installed in the cavity through the open side of the housing body. The battery cell 100 also includes a terminal post. The terminal post passes through the end cap. One end of the terminal post extends into the cavity and is connected to the electrode assembly 20. The other end of the terminal post is located on the outside of the housing 10 and is used to connect to external components through a conductive element.

[0129] In some examples, such as Figure 3 and Figure 4 As shown, the electrode assembly 20 is disposed within the housing 10. The electrode assembly 20 can be a stacked cell or a wound cell. Further, the battery cell 100 may include one or more electrode assemblies 20. When multiple electrode assemblies 20 are included, the multiple electrode assemblies 20 are stacked along a first direction X, where the first direction X is the thickness direction of the electrode assembly 20.

[0130] like Figure 3 and Figure 4 As shown, the buffer 30 is disposed inside the housing 10. The buffer 30 can be arranged between the electrode assembly 20 and the inner wall of the housing 10, or between adjacent electrode assemblies 20. When the buffer 30 is arranged between the electrode assembly 20 and the inner wall of the housing 10, one side surface of the buffer 30 in the first direction X abuts against the electrode assembly 20, and the other side surface abuts against the inner wall of the housing 10. When multiple electrode assemblies 20 are disposed inside the housing 10, the buffer 30 is arranged between adjacent electrode assemblies 20, and both sides of the buffer 30 in the first direction X abut against two electrode assemblies 20 respectively.

[0131] Since the buffer 30 is located inside the housing 10, when the battery device 1000 is subjected to external impact or vibration, the buffer 30 can effectively absorb energy and reduce the risk of damage to the electrode assembly 20. When the battery cell 100 is charging or discharging, the electrode assembly 20 will expand or contract. The buffer 30 can absorb the expansion force of the electrode assembly 20 by deforming, providing expansion space for the electrode assembly 20, thereby reducing the risk of stress concentration in the battery cell 100. At the same time, the buffer 30 can support the electrode assembly 20 inside the housing 10, stabilize the electrode assembly 20, reduce the probability of the electrode assembly 20 shaking inside the housing 10, maintain the internal structural stability of the battery cell 100, and improve the reliability of the battery cell 100.

[0132] In this embodiment, as Figure 4 and Figure 5 As shown, the buffer 30 includes two support plates 31 and a telescopic structure 32 connected between the two support plates 31. The two support plates 31 are plate-shaped and arranged perpendicular to the first direction X. The two support plates 31 are arranged in parallel and spaced apart in the first direction X. The telescopic structure 32 is connected between the two support plates 31 and can extend and retract along the first direction X.

[0133] Among them, such as Figure 4 and Figure 5 As shown, the buffer 30 includes two support plates 31, and the buffer 30 abuts against the electrode assembly 20 through the support plates 31. Since the support plates 31 are in surface contact with the electrode assembly 20, the contact area between the support plates 31 and the electrode assembly 20 can be increased. When the battery cell 100 is subjected to vibration, impact, or when the electrode assembly 20 is subjected to stress due to volume change, the support plates 31 can evenly distribute the stress, reduce the probability of stress concentration in the battery cell 100, reduce the probability of the electrode assembly 20 being damaged due to excessive local stress, and improve the buffering performance of the buffer 30.

[0134] Meanwhile, the two support plates 31 are arranged at intervals, and the telescopic structure 32 is connected between the two support plates 31 and can extend and retract along the first direction X. In this way, the buffer 30 can stably and reliably extend and retract along the first direction X, thereby improving the stability of the support and buffer of the electrode assembly 20.

[0135] In some examples, the telescopic structure 32 can be a spring structure, such as a coil spring, a leaf spring, or a spring sheet structure. In some examples, the telescopic structure 32 can be a flexible elastic structure, such as an elastic rubber component or an elastic foam component. In some examples, the telescopic structure 32 can be an elastic bellows structure. In some examples, the telescopic structure 32 can also be a telescopic frame, a telescopic pole, etc.

[0136] In this embodiment, the telescopic structure 32 is connected between two support plates 31 and is telescopic along the first direction X. When the electrode assembly 20 expands, the electrode assembly 20 pushes the telescopic structure 32 through the support plates 31 to compress the telescopic structure 32. At this time, the distance between the two support plates 31 decreases, providing expansion space for the electrode assembly 20 and absorbing and buffering the expansion force of the electrode assembly 20. When the battery cell 100 is subjected to external force, the external force is transmitted to the support plates 31 and the telescopic structure 32 through the housing 10. The telescopic structure 32 absorbs the impact force through telescopic deformation, reducing the impact on the electrode assembly 20. Furthermore, the support plates 31 can make the force on the electrode assembly 20 more uniform, further reducing the risk of stress concentration in the electrode assembly 20 and improving the reliability and service life of the battery cell 100.

[0137] Furthermore, since the telescopic structure 32 is connected between the two support plates 31, the telescopic structure 32 only needs to be telescopic in the first direction X, without completely filling the space between the two support plates 31. This reduces the space occupied by the buffer 30 in the housing 10, allowing for a larger storage space for the electrode fluid, thereby increasing the electrolyte filling amount in the housing 10, improving the cycle life and overall performance of the battery cell 100. In addition, since the telescopic structure 32 in this embodiment does not need to be made into a solid volume structure, it can also significantly reduce the amount of electrolyte adsorbed, so that more electrolyte in the housing 10 can effectively participate in the charging and discharging process, further improving the range of the battery cell 100.

[0138] In the above technical solution, since the buffer 30 of the battery cell 100 includes two support plates 31 and a telescopic structure 32 connected between the two support plates 31 and telescopic along the first direction X, the support plates 31 can increase the contact area with the electrode assembly 20, uniformly disperse stress, and effectively reduce the risk of stress concentration in the electrode assembly 20. The telescopic structure 32 can effectively absorb and reduce the external impact force and expansion force of the electrode assembly 20 on the battery cell 100 through telescopic deformation along the first direction X, providing reliable and stable support and buffer for the electrode assembly 20. At the same time, the telescopic structure 32 does not need to completely fill the space between the two support plates 31, thereby reducing the space occupied in the housing 10, increasing the arrangement space of the electrode assembly 20 and electrolyte, increasing the electrode liquid filling amount, significantly reducing the amount of electrode liquid adsorption, and increasing the amount of electrolyte that can effectively participate in the charging and discharging process of the battery cell 100, thereby improving the energy density, cycle life and overall reliability of the battery cell 100.

[0139] In some embodiments of this application, such as Figure 4 As shown, in the projection plane perpendicular to the first direction X, the projected area of ​​the telescopic structure 32 is smaller than the projected area of ​​the support plate 31.

[0140] In some examples, the ratio of the projected area of ​​the telescopic structure 32 to the projected area of ​​the support plate 31 in the projection plane perpendicular to the first direction X is less than or equal to 0.7. Further, the ratio of the projected area of ​​the telescopic structure 32 to the projected area of ​​the support plate 31 in the projection plane perpendicular to the first direction X is less than or equal to 0.5. Even further, the ratio of the projected area of ​​the telescopic structure 32 to the projected area of ​​the support plate 31 in the projection plane perpendicular to the first direction X is less than or equal to 0.3.

[0141] For example, in the projection plane perpendicular to the first direction X, the ratio of the projected area of ​​the telescopic structure 32 to the projected area of ​​the support plate 31 can be 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, or 0.8, etc.

[0142] In the above technical solution, by making the projected area of ​​the telescopic structure 32 in the projection plane perpendicular to the first direction X smaller than the projected area of ​​the support plate 31, the buffer 30 can effectively buffer the electrode assembly 20 along the first direction X, while reducing the space occupied by the telescopic structure 32, leaving more space for the electrolyte and electrode assembly 20 in the housing 10, increasing the amount of electrode liquid filled, increasing the amount of electrolyte that can effectively participate in the charging and discharging process of the battery cell 100, thereby improving the energy density and cycle life of the battery cell 100.

[0143] In some embodiments of this application, such as Figure 4 and Figure 5 As shown, the telescopic structure 32 includes one or more telescopic members 321, and each telescopic member 321 is connected to two support plates 31 at both ends.

[0144] For example, the telescopic structure 32 may include only one telescopic member 321, with both ends of the telescopic member 321 connected to two support plates 31 respectively. Alternatively, the telescopic structure 32 may include two, three, four, five, six, seven or more telescopic members 321, with both ends of each telescopic member 321 connected to two support plates 31.

[0145] In this embodiment, the overall buffering force and elastic coefficient of the buffer 30 can be flexibly changed by adjusting the number, material and distribution of the telescopic members 321. For example, by increasing the number of telescopic members 321, the buffering effect of the buffer 30 can be enhanced. By reducing the number of telescopic members 321, the cost can be reduced and the space occupied can be reduced, further freeing up more space for the electrolyte.

[0146] In the above technical solution, since the telescopic structure 32 includes one or more telescopic members 321, and each telescopic member 321 is connected to two support plates 31 at both ends, the elastic coefficient, buffering effect and space occupied by the buffer member 30 can be adjusted by adjusting the number of telescopic members 321.

[0147] In some embodiments of this application, such as Figures 6-11 As shown, the telescopic structure 32 includes multiple telescopic members 321, which are arranged at intervals along the second direction Y and / or the third direction Z, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0148] Wherein, the intersection of the first direction X and the second direction Y indicates that the first direction X and the second direction Y are not parallel, but rather arranged at an angle. For example, the angle between the first direction X and the second direction Y can be 30°, 45°, 60°, 80°, or 90°, etc. In some specific examples, the first direction X and the second direction Y are perpendicular to each other. Similarly, it can be seen that the first direction X intersects the third direction Z, and the second direction Y intersects the third direction Z.

[0149] In some examples, the first direction X can be the thickness direction of the battery cell 100, electrode assembly 20, and support plate 31; the second direction Y can be the length direction of the battery cell 100, electrode assembly 20, and support plate 31; and the third direction Z can be the width direction of the battery cell 100, electrode assembly 20, and support plate 31. In some specific examples, such as... Figures 7-9 As shown, multiple telescopic components 321 can be arranged at intervals along the length of the support plate 31, such as... Figures 10-11As shown, multiple telescopic components 321 can be arranged at intervals along the width direction of the support plate 31, and multiple telescopic components 321 can also be arranged at intervals along both the length and width directions of the support plate 31.

[0150] In this embodiment, since multiple telescopic members 321 are connected to two support plates 31, each telescopic member 321 can independently bear part of the force transmitted from the support plate 31. This allows the force to be more evenly distributed on each telescopic member 321 when the electrode assembly 20 is subjected to impact or stress due to volume change, reducing the risk of damage to a certain part due to excessive local stress and extending the service life of the buffer 30 and the electrode assembly 20.

[0151] Furthermore, when a single telescopic component 321 malfunctions, only that single telescopic component 321 needs to be replaced, without replacing the entire buffer component, thus reducing maintenance costs and difficulty and improving the maintainability of the battery cell 100.

[0152] In the above technical solution, since multiple telescopic members 321 are arranged at intervals along the second direction Y and / or the third direction Z, the support plate 31 can disperse stress in the second direction Y and / or the third direction Z through the multiple telescopic members 321, reduce the risk of local stress concentration, improve the buffer performance of the buffer member 30, and the space occupied between the two support plates 31 can be further reduced by the space occupied between the two support plates 31, increase the filling amount of electrode liquid, thereby improving the energy density and cycle life of the battery cell 100.

[0153] In some embodiments of this application, such as Figures 4-5 As shown, two of the multiple telescopic members 321 are respectively arranged at both ends of the support plate 31 in the second direction Y or the third direction Z.

[0154] In some examples, such as Figure 4 and Figure 5 As shown, the second direction Y is the length direction of the support plate 31, and two of the multiple telescopic members 321 are respectively arranged at both ends of the support plate 31 in the length direction. In some examples, the third direction Z is the width direction of the support plate 31, and two of the multiple telescopic members 321 are respectively arranged at both ends of the support plate 31 in the width direction. When the number of telescopic members 321 is greater than two, the remaining telescopic members 321 are spaced apart between the two telescopic members 321 located at both ends. Further, the multiple telescopic members 321 can be evenly distributed in a plane perpendicular to the thickness direction of the support plate 31.

[0155] It should be noted that the periphery of the support plate 31 is often a region where stress is concentrated and the structure is weak. In this embodiment, by arranging the telescopic members 321 at both ends of the support plate 31 in the second direction Y or the third direction Z, the support and buffering effect on the edge of the support plate 31 can be effectively enhanced. In this way, when the battery cell 100 is impacted by the edge regions of the support plate 31 at both ends in the second direction Y or the third direction Z, the telescopic members 321 at both ends can effectively support and buffer the support plate 31, reducing the probability of deformation or damage to the support plate 31 due to excessive stress on the edge of the support plate 31, and improving the buffering protection effect on the electrode assembly 20.

[0156] Meanwhile, by arranging telescopic members 321 at both ends of the support plate 31 in the second direction Y or the third direction Z, the stress of the support plate 31 supported and buffered by the multiple telescopic members 321 in the second direction Y or the third direction Z can be made more uniform, so that the support plate 31 is subjected to balanced force, reducing the probability of local stress concentration, improving the stability of the electrode assembly 20, and improving the reliability and service life of the battery cell 100.

[0157] In the above technical solution, since the two telescopic members 321 are respectively arranged at both ends of the support plate 31 in the second direction Y or the third direction Z, they can not only support and buffer the edge of the support plate 31, reducing the probability of damage to the edge of the support plate 31, but also make the stress distribution of the support and buffer of the support plate 31 by the multiple telescopic members 321 in the second direction Y or the third direction Z more uniform, reducing the probability of local stress concentration and improving the stability of the electrode assembly 20.

[0158] In some embodiments of this application, reference is made to Figure 4 and Figure 5 The number of telescopic members 321 is at least three, and one of the multiple telescopic members 321 is arranged at the middle position of the support plate 31 in the second direction Y or the third direction Z.

[0159] In other words, three of the multiple telescopic components 321 are respectively arranged at both ends and the middle of the support plate 31 in the second direction Y. Thus, the telescopic components 321 at both ends can withstand impacts from the edges, while the telescopic component 321 in the middle can buffer the stress generated in the middle of the electrode assembly 20 due to volume changes or external impacts, achieving effective support for different positions of the support plate 31 and providing all-round protection for the electrode assembly 20. Simultaneously, when the battery cell 100 is subjected to forces acting at various positions along the first direction X, the three telescopic components 321 can evenly distribute the force, reducing the risk of stress concentration and keeping the electrode assembly 20 stable within the housing 10, improving the buffering stability of the electrode assembly 20. Furthermore, when some telescopic components 321 malfunction, the other telescopic components 321 can still maintain a certain buffering capacity, ensuring the stable operation of the battery cell 100.

[0160] In the above technical solution, three telescopic components 321 are respectively arranged at both ends and the middle of the support plate 31 in the second direction Y or the third direction Z. This allows the support plate 31 to buffer and support the electrode assembly 20 in all directions along the second direction Y or the third direction Z, so that the force can be evenly distributed and the force uniformity and buffering stability of the electrode assembly 20 can be improved.

[0161] In some embodiments of this application, such as Figures 6-20 As shown, the two ends of the telescopic component 321 are rotatably connected to the two support plates 31 respectively.

[0162] In other words, referencing Figure 6 The telescopic member 321 has a first end and a second end arranged opposite to each other in the first direction X. The first end is rotatably connected to one of the support plates 31, and the second end is rotatably connected to the other support plate 31. At this time, the relative rotation angle between the first end and the connected support plate 31 is adjustable, and the relative rotation angle between the second end and the connected support plate 31 is also adjustable. In this way, by rotating both ends of the telescopic member 321 relative to the support plate 31, the relative angle between the telescopic member 321 and the support plate 31 can be adjusted, thereby adjusting the distance between the two support plates 31 in the first direction X, so that the buffer member 30 can be telescopic along the first direction X.

[0163] When the battery cell 100 is subjected to an external impact or an expansion force from the electrode assembly 20, the force can be transmitted to the telescopic member 321 through the support plate 31, causing the telescopic member 321 to rotate relative to the support plate 31, reducing the distance between the two support plates 31, thereby absorbing and buffering the force and improving the operational stability of the battery cell 100.

[0164] In some examples, to enable the telescopic member 321 to be rotatably connected to the two support plates 31 at both ends, the first and second ends of the telescopic member 321 connected to the support plates 31 are both made of rigid materials with a certain strength. This facilitates a smooth rotatable connection between the telescopic member 321 and the support plates 31, allowing the support plates 31 to smoothly push the telescopic member 321 to rotate, thus achieving effective force transmission.

[0165] In this embodiment, the telescopic member 321 is rotatably connected to the support plate 31, and the telescopic member 321 can be made of a rigid material. This not only gives the telescopic member 321 sufficient strength and rigidity, but also further reduces the space occupied by the telescopic member 321, reduces the amount of electrolyte adsorbed by the telescopic member 321, increases the arrangement space of the electrode assembly 20, and increases the amount of electrode liquid filled, thereby improving the energy density, cycle life and overall reliability of the battery cell 100.

[0166] In some examples, the two ends of the telescopic member 321 can be rotatably connected to the support plate 31 via a pivot, shaft hole, or bearing. The two ends of the telescopic member 321 can also be rotatably connected to the support plate 31 via a hinge, or via a ball joint. In other examples, the two ends of the telescopic member 321 can be connected to the support plate 31 via an elastic joint, or via a magnetic connection, or via a universal joint, etc.

[0167] In the above technical solution, since the two ends of the telescopic member 321 are rotatably connected to the two support plates 31, the relative angle between the telescopic member 321 and the support plates 31 can be adjusted by rotating the two ends of the telescopic member 321 relative to the support plates 31, thereby adjusting the distance between the two support plates 31 in the first direction X, so that the buffer member 30 can be telescopic along the first direction X. At the same time, the telescopic member 321 can be made of rigid material, reducing the space occupied by the telescopic member 321, reducing the amount of electrolyte adsorbed by the telescopic member 321, increasing the amount of electrode liquid filled, thereby improving the energy density, cycle life and overall reliability of the battery cell 100.

[0168] In some embodiments of this application, such as Figures 6-10 As shown, the telescopic member 321 is formed as a support rod 321a in the shape of a rod.

[0169] In some examples, the telescopic member 321 is formed as a support rod 321a, the two ends of which are rotatably connected to two support plates 31 respectively. The support rod 321a is a rod-shaped rod extending in a straight line, and the cross-section of the support rod 321a can be circular, elliptical, or square, etc.

[0170] For example Figure 6As shown, the support rod 321a is a straight rod inclined relative to the first direction X, and its two ends are hinged to two support plates 31 respectively. Figure 6 The buffer 30 shown includes multiple support rods 321a, which are spaced apart in the width direction of the support plate 31 and have the same inclination direction. The two ends of each support rod 321a are respectively connected to the opposite ends of the two support plates 31 in the length direction. At this time, the two support plates 31 and the multiple support rods 321a form a Z-shaped telescopic structure 32.

[0171] like Figures 7-9 As shown, in some examples, the buffer 30 includes a plurality of support rods 321a, which are spaced apart along the length of the support plate 31. In the initial state, the plurality of support rods 321a are straight rods extending perpendicular to the support plate 31. In the compressed state, the plurality of support rods 321a rotate relative to the support plate 31 and are inclined relative to the support plate 31. At this time, the plurality of support rods 321a and the two support plates 31 together form a parallelogram telescopic structure 32.

[0172] In order to reduce the movement of the support plate 31 along the length of the electrode assembly 20, in some examples, at least one end of the support rod 321a is slidably connected to the support plate 31 along the second direction Y. Specifically, at least one end of the support rod 321a is provided with a slider, and the support plate 31 is provided with a slide rail or slide groove extending along the second direction Y. The slider is slidably engaged in the slide rail or slide groove, and the slider is rotatably connected to the support rod 321a. In this way, when the support plate 31 pushes the support rod 321a to rotate relative to the support plate 31, the support rod 321a can also slide relative to the support plate 31. Thus, the relative positions of the two support plates 31 in the length of the electrode assembly 20 remain unchanged, and only the support rod 321a rotates and moves relative to each other, realizing the extension and retraction of the buffer 30 along the first direction X.

[0173] In other examples, the telescopic member 321 may also be formed as a plate shape inclined relative to the first direction X, with both ends rotatably connected to two support plates 31. One end of the telescopic member 321 may have a connecting portion, or multiple connecting portions arranged at intervals may be provided, each connecting portion rotatably connected to a support plate 31. For example, the telescopic member 321 may be a plate shape extending along the length direction of the support plate 31, with both ends of the telescopic member 321 rotatably connected to two support plates 31 in the width direction. Alternatively, both ends of the telescopic member 321 may be rotatably connected to two support plates 31 in the length direction.

[0174] In this embodiment, the telescopic member 321 is formed as a rod-shaped support rod 321a. The rod-shaped support rod 321a has good compressive and bending resistance, providing stable support for the two support plates 31. When the battery cell 100 is subjected to vibration, impact, or volume change of the electrode assembly 20, the support rod 321a can effectively resist external forces, maintaining the overall structural stability of the buffer member 30 and reducing the probability of damage to the electrode assembly 20 due to insufficient support and buffering. Simultaneously, the rod-shaped support rod 321a can clearly guide the telescopic direction of the buffer member 30, ensuring that the telescopic process proceeds along a predetermined first direction X, making the buffering action more precise and reducing the risk of affecting the buffering effect due to deviation in the telescopic direction.

[0175] Furthermore, the telescopic component 321 is formed in the shape of a rod, which has a simple structure and regular shape, reducing production costs and improving production efficiency. It also reduces the installation difficulty of the telescopic component 321, improves assembly efficiency, and facilitates the assembly and maintenance of the battery cell 100. In addition, the rod-shaped telescopic component 321 occupies less space within the housing 10, which helps to improve the utilization rate of the internal space of the battery cell 100, leaving more space for other components such as electrolyte, thereby improving the overall performance of the battery cell 100.

[0176] It should be noted that the cross-sectional area of ​​the support rod 321a can be set according to the spatial arrangement within the battery cell 100. By adjusting the thickness of the support rod 321a, the volume ratio of the support rod 321a within the housing 10 can be changed, thereby changing the amount of electrolyte injected.

[0177] In the above technical solution, since the telescopic component 321 is formed into a rod-shaped support rod 321a, the support rod 321a can not only provide stable support for the two support plates 31 and improve the support and buffering effect of the electrode assembly 20, but also has a simple structure and is easy to assemble, which helps to reduce production costs and improve assembly efficiency. In addition, the support rod 321a occupies little space, which can leave more space for other components such as electrolyte, thereby improving the overall performance of the battery cell 100.

[0178] In some embodiments of this application, such as Figures 11-20 As shown, the telescopic component 321 includes a cross unit 3211, which includes two connecting rods 32111. The two connecting rods 32111 are arranged crosswise and rotatably connected. Both ends of the two connecting rods 32111 are rotatably connected to two support plates 31 respectively.

[0179] In some examples, the cross unit is composed of two connecting rods 32111 that are cross-connected. Specifically, the middle parts of the two connecting rods 32111 are rotatably connected. For example, each connecting rod 32111 has a through hole in its middle, and a pivot is inserted through the through holes of the two connecting rods 32111, thus achieving a rotatable connection between the two connecting rods 32111. Alternatively, the middle parts of the two connecting rods 32111 can be riveted together.

[0180] In some examples, such as Figures 10-15 As shown, in the first direction X, which is the front-to-back direction, two support plates 31 are arranged at a distance from each other. The front ends of the two connecting rods 32111 are connected to the support plate 31 located on the front side in the longitudinal direction (e.g., Figure 11 The two ends of the second direction (Y) shown are hinged, and the rear ends of the two connecting rods 32111 are respectively hinged to the two ends of the support plate 31 located on the rear side in the length direction. Further, there are multiple telescopic members 321, each telescopic member 321 including a cross unit 3211, and the multiple cross units 3211 are along the width direction of the support plate 31 (e.g., ...). Figure 11 The third direction (Z) is arranged in a spaced manner as shown. For example, the buffer 30 includes two cross units 3211, which are respectively arranged at both ends of the support plate 31 in the width direction.

[0181] Furthermore, at least one end of the connecting rod 32111 is slidably connected to the support plate 31 along the second direction Y. Specifically, at least one end of the connecting rod 32111 is provided with a slider, and the support plate 31 is provided with a slide rail or slide groove extending along the second direction Y. The slider is slidably fitted into the slide rail or slide groove, and the slider is rotatably connected to the support rod 321a. In this way, when the support plate 31 pushes the connecting rod 32111 to rotate relative to the support plate 31, the connecting rod 32111 can also slide relative to the support plate 31. Thus, the relative positions of the two support plates 31 in the length direction of the electrode assembly 20 remain unchanged, and only the connecting rod 32111 rotates and moves relative to each other, realizing the extension and retraction of the buffer 30 along the first direction X.

[0182] In some examples, such as Figure 16 and Figure 17 As shown, in the first direction X, which is the front-to-back direction, two support plates 31 are arranged at a distance from each other. The front ends of the two connecting rods 32111 are respectively connected to the support plate 31 located on the front side in the width direction (e.g., Figure 17 The two ends of the third link 32111 shown are hinged to each other in the width direction, and the rear ends of the two links 32111 are respectively hinged to the two ends of the support plate 31 located on the rear side. Further, there are multiple telescopic members 321, each including a cross unit 3211, and the multiple cross units 3211 are along the length direction of the support plate 31 (e.g., along the length direction of the support plate 31). Figure 17The second direction (Y) is shown in the diagram. For example, the buffer 30 includes two intersecting units 3211, which are respectively arranged at both ends of the support plate 31 in the length direction.

[0183] Furthermore, at least one end of the connecting rod 32111 is slidably connected to the support plate 31 along the third direction Z. Specifically, at least one end of the connecting rod 32111 is provided with a slider, and the support plate 31 is provided with a slide rail or slide groove extending along the third direction Z. The slider is slidably fitted into the slide rail or slide groove, and the slider is rotatably connected to the support rod 321a. In this way, when the support plate 31 pushes the connecting rod 32111 to rotate relative to the support plate 31, the connecting rod 32111 can also slide relative to the support plate 31. Thus, the relative positions of the two support plates 31 in the width direction of the electrode assembly 20 remain unchanged, and only the connecting rod 32111 rotates and moves relative to each other, realizing the extension and retraction of the buffer 30 along the first direction X.

[0184] In this embodiment, the telescopic member 321 is a cross unit 3211 composed of two cross-arranged and rotatably connected connecting rods 32111. When the electrode assembly 20 expands or the battery cell 100 is impacted by an external force, the two connecting rods 32111 can expand and contract by rotating and changing the cross angle of the two connecting rods 32111. Thus, the expansion and contraction of the cross unit 3211 along the first direction X can be more flexible, effectively absorb and buffer energy, provide reliable protection for the electrode assembly 20, and reduce the risk of damage.

[0185] Meanwhile, the cross unit 3211 has good structural stability. During the extension and retraction process, it can evenly distribute the force from the electrode assembly 20 or the outside to the two support plates 31, reduce stress concentration, improve the force balance of the electrode assembly 20, and extend the battery life. In addition, the cross unit 3211 has a compact structure and occupies little space, which helps to optimize the internal space layout of the battery cell 100, provide more space for other components such as electrolyte, and thus improve the overall performance and energy density of the battery cell 100.

[0186] In the above technical solution, the telescopic component 321 includes a cross unit 3211 composed of two cross-arranged and rotatably connected connecting rods 32111. The cross unit 3211 is flexible in telescoping in the first direction X and has good stability. It can effectively absorb and buffer energy, reduce the risk of damage to the electrode assembly 20, and the cross unit 3211 has a compact structure and occupies little space, which can improve the overall performance and energy density of the battery cell 100.

[0187] In some embodiments of this application, the telescopic member 321 includes a cross unit 3211, or the telescopic member 321 includes a plurality of cross units 3211 connected sequentially along the first direction X.

[0188] like Figure 10 and Figure 11 As shown, the buffer member 30 includes two telescopic members 321 spaced apart along the width direction of the support plate 31. Each telescopic member 321 is formed as a cross unit 3211 consisting of two cross-connected and rotatably linked rods 32111. In this embodiment, the telescopic member 321 includes a cross unit 3211, which simplifies the structure of the telescopic member 321, reduces the number of parts, reduces space occupation, lowers costs, and reduces the space occupied within the housing 10.

[0189] like Figure 18 and Figure 19 As shown, the buffer 30 includes two telescopic members 321 spaced apart along the width direction of the support plate 31. Each buffer 30 includes two cross units 3211 connected sequentially along the first direction X. Each cross unit 3211 is composed of two cross-connected and rotatably connected links 32111.

[0190] like Figure 20 As shown, the buffer 30 includes two telescopic members 321 spaced apart along the length of the support plate 31. Each buffer 30 includes two cross units 3211 connected sequentially along the first direction X. Each cross unit 3211 is composed of two cross-connected and rotatably connected links 32111.

[0191] In this embodiment, multiple cross units 3211 are sequentially connected along the first direction X, which can increase the extension stroke and buffering capacity of the telescopic member 321. When the electrode assembly 20 expands significantly or the battery cell 100 is subjected to a strong impact, the multiple cross units 3211 can extend and deform in stages or simultaneously, thereby better absorbing and dispersing energy and further improving the buffering and protection effect on the electrode assembly 20.

[0192] Since the expansion joint 321 can cooperate with each other and expand and contract synchronously through multiple cross units 3211, and the cross units 3211 share the stress, the expansion and contraction process of the expansion joint 321 can be made smoother, reducing the risk of local stress concentration, reducing the risk of local damage, and improving the stability and durability of the expansion joint 321.

[0193] Additionally, it should be noted that the number of cross units 3211 of the telescopic member 321 can be set according to the performance parameters of the electrode assembly 20, such as the expansion amount of the electrode assembly 20, and / or according to the environmental parameters of the battery device 1000, so as to ensure that the buffer member 30 can effectively buffer the electrode assembly 20 and reduce the space occupied in the housing 10.

[0194] In the above technical solution, since the telescopic member 321 includes one or multiple cross units 3211 connected sequentially along the first direction X, the number of cross units 3211 of the telescopic member 321 can be set according to the performance of the electrode assembly 20 and the environmental requirements of the battery device 1000, so that the telescopic member 321 can reduce space occupation and improve the energy density and overall performance of the battery cell 100 while meeting the buffer performance requirements.

[0195] In some embodiments of this application, reference is made to Figures 11-20 As shown, the telescopic component 321 is riveted to the support plate 31.

[0196] For example, the telescopic member 321 has a first rivet hole at its end. When the telescopic member 321 is a support rod 321a, both ends of the support rod 321a have first rivet holes. When the telescopic member 321 is a cross unit 3211, both ends of the two connecting rods 32111 of the cross unit 3211 have first rivet holes. The support plate 31 has a second rivet hole. The first rivet hole and the second rivet hole are aligned along the width or length direction of the support plate 31. The rivet passes through the first rivet hole and the second rivet hole in sequence to rivet the telescopic member 321 to the support plate 31. At this time, the support rod 321a or the connecting rod 32111 of the telescopic member 321 can rotate relative to the support plate 31 around the central axis of the rivet.

[0197] In the above technical solution, since the telescopic component 321 is riveted to the support plate 31, the connection reliability between the telescopic component 321 and the support plate 31 can be improved, so that the buffer component 30 can effectively withstand the stress and impact generated by the battery cell 100 during operation; at the same time, the riveting connection process is simple, low-cost, and easy to operate, which can reduce costs and improve assembly efficiency.

[0198] In some embodiments of this application, the telescopic member 321 is a polycarbonate member, an engineering plastic alloy member, a polyphenylene ether member, or a polyvinyl chloride member.

[0199] In the above technical solution, the telescopic component 321 is a polycarbonate component, an engineering plastic alloy component, a polyphenylene ether component, or a polyvinyl chloride component. This can improve the strength and toughness of the telescopic component 321, enabling it to provide cushioning without easily breaking. It can also improve the corrosion resistance and chemical stability of the telescopic component 321, extending its service life. In addition, it can make the telescopic component 321 easier to process and form, reducing costs and improving the overall quality and economy of the battery cell 100.

[0200] In some embodiments of this application, such as Figure 21 As shown, the telescopic member 321 is an elastic member 321b extending along the first direction X, and the telescopic member 321 can be elastically deformed along the first direction X.

[0201] In the above technical solution, since the telescopic member 321 can be elastically deformed along the first direction X, when the battery cell 100 is subjected to vibration, impact or volume change of the electrode assembly 20, the telescopic member 321 can absorb and disperse energy through elastic deformation, reduce the impact force on the electrode assembly 20, and protect the electrode assembly 20 from damage. At the same time, the elastic member 321b can automatically reset. When the volume of the electrode assembly 20 changes repeatedly, the elastic member 321b can adapt to the volume change of the electrode assembly 20, so that the buffer member 30 can always support the electrode assembly 20 and maintain the structural stability inside the battery cell 100.

[0202] In some embodiments of the present application, as Figure 21 and Figure 22 shown, the telescopic member 321 extends in a long strip shape along the second direction Y or the third direction Z, and the first direction X, the second direction Y and the third direction Z intersect pairwise.

[0203] For example, the second direction Y is the length direction of the electrode assembly 20 and the support plate 31, and the third direction Z is the width direction of the electrode assembly 20 and the support plate 31. In some examples, as Figure 4 and Figure 5 shown, the telescopic structure 32 includes two telescopic members 321. The telescopic member 321 is an elastic member 321b. The elastic member 321b is connected between the two support plates 31. The two elastic members 321b are arranged at intervals along the length direction of the support plate 31, and the elastic member 321b extends in a long strip shape along the width direction of the support plate 31. In other examples, the two elastic members 321b are arranged at intervals along the width direction of the support plate 31 and extend in a long strip shape along the length direction of the support plate 31.

[0204] In other embodiments, the telescopic member 321 can extend in a ring shape along the circumferential direction of the support plate 31, or, in a plane perpendicular to the first direction X, the projection of the telescopic member 321 can be in the shape of a Chinese character 'Ri' (日), 'Mu' (目) or 'Tian' (田).

[0205] In the above technical solution, since the telescopic member 321 is formed as the elastic member 321b and extends in a long strip shape in a plane perpendicular to the first direction X, the elastic member 321b can not only support and buffer the electrode assembly 20 in the first direction X, but also provide support and buffer for the electrode assembly 20 when the battery cell 100 is subjected to an impact force in the second direction Y or the third direction Z, improving the protection effect on the electrode assembly 20. In addition, the long-strip-shaped elastic member 321b can increase the contact area with the support plate 31, improve the uniformity of force, and reduce the risk of stress concentration.

[0206] In some embodiments of the present application, as Figure 21 and Figure 22As shown, the telescopic member 321 extends along the second direction Y and its two ends are flush with the two end edges of the support plate 31 in the second direction Y; or, the telescopic member 321 extends along the third direction Z and its two ends are flush with the two side edges of the support plate 31 in the third direction Z.

[0207] In some examples, the telescopic member 321 is an elastic member 321b, and the telescopic member 321 extends along the width direction of the support plate 31, with its two end faces in the width direction being flush with the two end faces of the support plate 31 in the width direction. In this embodiment, the telescopic member 321 extends along the second direction Y and its two ends are flush with the two end edges of the support plate 31 in the second direction Y. This allows the telescopic member 321 to completely cover the support plate 31 in the width direction, ensuring a uniform distribution of force between the support plate 31 and the telescopic member 321 in the width direction of the support plate 31. Furthermore, since the telescopic member 321 does not extend beyond the two end edges of the support plate 31 in the width direction, it does not occupy additional space beyond the support plate 31, making the buffer member 30 structure compact, reducing space occupation, and improving the energy density of the battery cell 100.

[0208] In some examples, the telescopic member 321 extends along the length of the support plate 31, and the two end faces of the telescopic member 321 in the length direction are flush with the two end faces of the support plate 31 in the length direction. This allows the telescopic member 321 to completely cover the support plate 31 in the length direction, ensuring a uniform distribution of force between the support plate 31 and the telescopic member 321 in the length direction of the support plate 31. Furthermore, since the telescopic member 321 does not extend beyond the two end edges of the support plate 31 in the length direction, it does not occupy additional space beyond the two ends of the support plate 31, resulting in a compact structure for the buffer member 30, reduced space occupation, and increased energy density of the battery cell 100.

[0209] In the above technical solution, since the two ends of the telescopic member 321 in the extension direction are flush with the two end edges of the support plate 31, the telescopic member 321 can cover the support plate 31 in the entire extension direction, so that the force between the support plate 31 and the telescopic member 321 is evenly distributed in the extension direction of the telescopic member 321, improving the uniformity of the force, reducing stress concentration, and also not occupying additional space beyond the periphery of the support plate 31, reducing space occupation and increasing the energy density of the battery cell 100.

[0210] In some embodiments of this application, such as Figure 21 and Figure 22 As shown, the telescopic member 321 is arranged between the two support plates 31, and the projection of the telescopic member 321 is completely located within the projection of the support plate 31; or, at least a portion of the telescopic member 321 is arranged on both sides of the two support plates 31 in the second direction Y or the third direction Z.

[0211] In other words, in the projection plane perpendicular to the first direction X, the projection of the telescopic member 321 is completely within the projection range of the two support plates 31. Thus, along the first direction X, the telescopic member 321 is completely arranged within the space defined by the two support plates 31. Therefore, the telescopic member 321 does not need to occupy the outer space beyond the periphery of the support plates 31, resulting in a compact structure and improved energy density of the battery cell 100.

[0212] like Figure 21-23 As shown, there are two telescopic members 321, which are respectively arranged at both ends of the support plate 31 in the length direction. The two telescopic members 321 do not extend beyond the two end faces of the support plate 31 in the length direction. Furthermore, the two opposite sides of the two telescopic members 321 in the length direction of the support plate 31 are flush with the two end faces of the support plate 31 in the length direction. Thus, the support of the edge of the support plate 31 can be achieved without occupying the space beyond the outside of the support plate 31. The structure is compact and the energy density of the battery cell 100 is improved.

[0213] In some examples, the telescopic member 321 may be partially arranged on both sides of the support plate 31 in the length or width direction, and the other part may be arranged between the two support plates 31. Alternatively, the two telescopic members 321 may be completely arranged on both sides of the support plate 31 in the length or width direction.

[0214] Reference Figure 4 and Figure 5 As shown, two telescopic members 321 extend along the first direction X and are respectively arranged on both sides of the two support plates 31 in the length direction. The two end faces of the telescopic members 321 in the first direction X are respectively flush with the opposite side surface of the two support plates 31 in the first direction X. The two end faces of the two support plates 31 in the length direction are respectively fixedly connected to the two telescopic members 321.

[0215] In the above technical solution, by ensuring that the projection of the telescopic member 321 along the first direction X is completely within the projection range of the support plate 31, the telescopic member 321 does not need to occupy space beyond the outer side of the support plate 31, reducing interference between the telescopic member 321 and other components within the housing 10, and improving the energy density and stability of the battery cell 100. Furthermore, by distributing at least a portion of the telescopic member 321 on both sides of the support plate 31, the contact area between the buffer member 30 and the electrode assembly 20 can be increased, further dispersing stress, reducing the probability of stress concentration, and improving the service life of the battery cell 100.

[0216] In some embodiments of this application, such as Figure 21 and Figure 22As shown, the two ends of the telescopic component 321 are bonded to the support plate 31.

[0217] In the above technical solution, by bonding the two ends of the telescopic component 321 to the support plate 31, the bonding operation is simple, which can reduce assembly costs and improve assembly efficiency. Furthermore, the surface contact and fit between the telescopic component 321 and the support plate 31 can evenly distribute stress and enhance the buffering effect.

[0218] In some embodiments of this application, the telescopic member 321 is a soft, compressible material, specifically, the telescopic member 321 is a polypropylene member, a polyethylene member, a polyester fiber member, or a melamine member.

[0219] In the above technical solution, since the telescopic component 321 is made of polypropylene, polyethylene, polyester fiber, or melamine, its chemical stability and corrosion resistance can be improved, the probability of it being corroded by electrolyte can be reduced, and its service life can be extended. Furthermore, the strength and toughness of the telescopic component 321 can be enhanced, thus improving the cushioning effect of the buffer component 30. In addition, the material and processing costs of the telescopic component 321 can be reduced, and production efficiency can be improved.

[0220] In some embodiments of this application, the support plate 31 is a rigid plastic composite material component. Specifically, the support plate 31 is a polycarbonate component, an engineering plastic alloy component, a polyphenylene ether component, or a polyvinyl chloride component.

[0221] In some examples, the support plate 31 and the telescopic member 321 may be made of the same or different materials. For example, when the support plate 31 is a polycarbonate part, an engineering plastic alloy part, a polyphenylene ether part, or a polyvinyl chloride part, the telescopic member 321 may also be a polycarbonate part, an engineering plastic alloy part, a polyphenylene ether part, or a polyvinyl chloride part. The telescopic member 321 may also be a polypropylene part, a polyethylene part, a polyester fiber part, or a melamine part.

[0222] In the above technical solution, by making the support plate 31 a polycarbonate part, an engineering plastic alloy part, a polyphenylene ether part, or a polyvinyl chloride part, the strength and toughness of the support plate 31 can be improved, so that the support plate 31 can not only provide cushioning but also be less prone to breakage. It can also improve the corrosion resistance and chemical stability of the support plate 31 and extend the service life of the support plate 31. In addition, the support plate 31 can be easily processed and formed, reducing costs and improving the overall quality and economy of the battery cell 100.

[0223] In some embodiments of this application, the support plate 31 is made of polypropylene, polyethylene, polyester fiber, or melamine.

[0224] In some examples, the support plate 31 and the telescopic member 321 may be made of the same or different materials. For example, when the support plate 31 is made of polypropylene, polyethylene, polyester fiber, or melamine, the telescopic member 321 may also be made of polypropylene, polyethylene, polyester fiber, or melamine. Furthermore, in the first direction X, the elastic modulus of the support plate 31 is greater than that of the telescopic member 321; in other words, in the first direction X, the stiffness of the support plate 31 is greater than that of the telescopic member 321.

[0225] In the above technical solution, since the support plate 31 is made of polypropylene, polyethylene, polyester fiber, or melamine, its chemical stability and corrosion resistance can be improved, reducing the probability of the support plate 31 being corroded by the electrolyte, extending its service life, and also improving its strength and toughness, thus enhancing the cushioning effect of the buffer 30. Furthermore, it can reduce the material and processing costs of the support plate 31 and improve production efficiency.

[0226] In some embodiments of this application, such as Figures 21-23 As shown, the buffer 30 can be switched between an initial state and a compressed state. In the initial state, the distance between the opposing surfaces of the two support plates 31 in the first direction X is a first dimension A. In the compressed state, the distance between the opposing surfaces of the two support plates 31 is a second dimension B, and the ratio of the second dimension B to the first dimension A is greater than or equal to 0.5 and less than or equal to 0.8.

[0227] For example, the ratio of the second dimension B to the first dimension A can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, or 0.8, etc.

[0228] The ratio of the second dimension B to the first dimension A is the compression ratio of the buffer 30. Setting the compression ratio of the buffer 30 to between 0.5 and 0.8 not only allows the buffer 30 to have sufficient compression space to absorb and disperse energy, reducing the impact force on the electrode assembly 20 and thus preventing it from being damaged due to excessive force, but also reduces the risk of excessive compression on the electrode assembly 20, ensuring the structural integrity and performance stability of the electrode assembly 20 and extending its service life.

[0229] Furthermore, the degree of expansion and the magnitude of external impact force on the electrode assembly 20 of the battery cell 100 will vary under different usage environments and operating conditions. In this embodiment, by setting the compression ratio between 0.5 and 0.8, the buffer 30 can adapt to various actual operating conditions, improving the applicability of the buffer 30 and enabling the battery cell 100 to work stably under various conditions.

[0230] In the above technical solution, since the compression ratio of the buffer 30 is between 0.5 and 0.8, the buffer 30 can effectively buffer the electrode assembly 20, reduce the risk of the electrode assembly 20 being over-compressed, improve the stability of the internal structure of the battery cell 100, and enable the buffer 30 to adapt to various actual working conditions, so that the battery cell 100 can work stably under various conditions.

[0231] In some embodiments of this application, such as Figure 23 As shown, there are multiple electrode assemblies 20, which are stacked along the first direction X, and the buffer 30 is disposed between two adjacent electrode assemblies 20.

[0232] For example, the number of electrode assemblies 20 may be two, three, four, five or more, and a buffer 30 may be provided between each pair of adjacent electrode assemblies 20.

[0233] In the above technical solution, since the buffer 30 is disposed between the two electrode assemblies 20, the buffer 30 can not only effectively buffer the stress generated by the expansion between adjacent electrode assemblies 20, reducing the probability of the electrode assemblies 20 squeezing each other and extending the service life of the battery cell 100, but also absorb and disperse the external impact force on the battery cell 100, reducing the impact on the electrode assemblies 20 and reducing the probability of faults such as internal short circuits in the battery cell 100. In addition, the buffer 30 can also isolate adjacent electrode assemblies 20, reducing heat transfer between adjacent electrode assemblies 20 and reducing the probability of short circuits between adjacent electrode assemblies 20.

[0234] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, the housing 10 is rectangular, and the electrode assembly 20 is a wound electrode assembly 20.

[0235] The rectangular housing 10 has a regular shape, which facilitates the arrangement of battery cells 100 in the battery module or battery device 1000, enabling modular design and improving the energy density of the battery device 1000. The wound electrode assembly 20 can be wound into a similar rectangular shape, thereby adapting to the rectangular housing 10, improving the space utilization of the housing 10, and further increasing the energy density of the battery cells 100.

[0236] In the above technical solution, the housing 10 is rectangular and the electrode assembly 20 is a wound electrode assembly 20, which can make the electrode assembly 20 adapt to the shape of the housing 10, thereby improving the energy density of the battery cell 100. In addition, the battery cells 100 of the square housing 10 are stacked in the box 400 of the battery device 1000, which can improve the energy density of the battery device 1000.

[0237] Secondly, embodiments of this application also provide a buffer 30, including the buffer 30 in the battery cell 100 of any of the above embodiments.

[0238] In the above technical solution, since the buffer 30 includes two support plates 31 and a telescopic structure 32 connected between the two support plates 31 and telescopic along the first direction X, the support plates 31 can increase the contact area with the electrode assembly 20, uniformly disperse stress, and effectively reduce the risk of stress concentration in the electrode assembly 20. The telescopic structure 32 can effectively absorb and reduce the external impact force on the battery cell 100 and the expansion force of the electrode assembly 20 through telescopic deformation along the first direction X, providing reliable and stable support and buffer for the electrode assembly 20. At the same time, the telescopic structure 32 does not need to completely fill the space between the two support plates 31, thereby reducing the space occupied in the housing 10, increasing the arrangement space of the electrode assembly 20 and electrolyte, increasing the electrode liquid filling amount, significantly reducing the amount of electrode liquid adsorption, and increasing the amount of electrolyte that can effectively participate in the charging and discharging process of the battery cell 100, thereby improving the energy density, cycle life and overall reliability of the battery cell 100.

[0239] Thirdly, embodiments of this application also provide a battery device 1000, including a battery cell 100 from any of the above embodiments.

[0240] In the above technical solution, since the battery device 1000 is provided with the aforementioned battery cell 100, and since the buffer 30 of the battery cell 100 includes two support plates 31 and a telescopic structure 32 connected between the two support plates 31 and extendable along the first direction X, the support plates 31 can increase the contact area with the electrode assembly 20, evenly distribute stress, and effectively reduce the risk of stress concentration in the electrode assembly 20. The telescopic structure 32, through its telescopic deformation along the first direction X, can effectively absorb and mitigate the external impact force on the battery cell 100 and the expansion force of the electrode assembly 20. This provides reliable and stable support and buffer for the electrode assembly 20. At the same time, the telescopic structure 32 does not need to completely fill the space between the two support plates 31, thereby reducing the space occupied in the housing 10, increasing the arrangement space of the electrode assembly 20 and electrolyte, increasing the amount of electrode liquid filled, significantly reducing the amount of electrode liquid adsorbed, and increasing the amount of electrolyte that can effectively participate in the charging and discharging process of the battery cell 100, thereby improving the energy density, cycle life and overall reliability of the battery cell 100, and thus improving the energy density and overall reliability of the battery device 1000.

[0241] Fourthly, this application also provides an electrical device 1, including the battery device 1000 of any of the above embodiments.

[0242] In the above technical solution, since the power device 1 is equipped with the battery device 1000, and since the buffer 30 of the battery cell 100 includes two support plates 31 and a telescopic structure 32 connected between the two support plates 31 and telescopically expandable along the first direction X, the support plates 31 can increase the contact area with the electrode assembly 20, evenly distribute stress, and effectively reduce the risk of stress concentration in the electrode assembly 20. The telescopic structure 32 can effectively absorb and reduce the external impact force and expansion force of the battery cell 100 and the electrode assembly 20 through telescopic deformation along the first direction X, providing reliable and stable support and buffer for the electrode assembly 20. At the same time, the telescopic structure 32 does not need to completely fill the space between the two support plates 31, thereby reducing the space occupied in the housing 10, increasing the arrangement space of the electrode assembly 20 and electrolyte, increasing the electrode liquid filling amount, significantly reducing the amount of electrode liquid adsorption, and increasing the amount of electrolyte that can effectively participate in the charging and discharging process of the battery cell 100, thereby improving the energy density, cycle life and overall reliability of the battery cell 100, and thus improving the overall performance of the power device 1.

[0243] The following will refer to Figures 1-23 The present application describes a battery cell 100 according to seven specific embodiments.

[0244] Example 1, refer to Figures 3-5 As shown, the battery cell 100 includes a housing 10, an electrode assembly 20, and a buffer 30. The housing 10 is square, the electrode assembly 20 is a wound electrode assembly 20, and there are two electrode assemblies 20. The two electrode assemblies 20 are arranged at intervals along the first direction X, and the buffer 30 is disposed between the two electrode assemblies 20.

[0245] Specifically, such as Figure 6 As shown, the buffer 30 includes two support plates 31 and a telescopic structure 32. The two support plates 31 are arranged perpendicular to the first direction X and spaced apart in the first direction X. The telescopic structure 32 is connected between the two support plates 31 and can extend and retract along the first direction X to adjust the distance between the two support plates 31.

[0246] like Figure 6As shown, the telescopic structure 32 includes a telescopic member 321, which is a support rod 321a inclined relative to the first direction X. The support rod 321a extends along the second direction Y, and its two ends in the second direction Y are rotatably connected to two support plates 31, for example, the support rod 321a is riveted to the support plates 31. Further, at least one end of the support rod 321a is slidably connected to the support plate 31 along the second direction Y. There are two support rods 321a, respectively arranged at both ends of the support plate 31 in the third direction Z; or there are three support rods 321a, respectively arranged at both ends and the middle of the support plate 31 in the third direction Z.

[0247] Among them, the support plate 31 is a polycarbonate part, an engineering plastic alloy part, a polyphenylene ether part, or a polyvinyl chloride part, and the support rod 321a is a polycarbonate part, an engineering plastic alloy part, a polyphenylene ether part, or a polyvinyl chloride part.

[0248] In this first embodiment, two support plates 31 and a support rod 321a connected between the two support plates 31 are riveted together to form a buffer 30 for the battery cell 100. This buffer replaces the bulk compression material buffer pad in the prior art, achieving both support and compression functions between the electrode assemblies 20 while occupying less internal space. Furthermore, by adjusting the thickness of the support rod 321a, the stress requirements of different systems, the space requirements of different electrolytes, and the expansion requirements of different electrode assemblies 20 can be met. In this embodiment, the two ends of the support rod 321a are directly riveted to the two support plates 31, making the buffer 30 easier to compress and meeting the need for rapid stress buffering.

[0249] Example 2, as Figures 7-9 As shown, the structure of this embodiment is roughly the same as that of Embodiment 1, with the same components using the same reference numerals. The only difference is that the support rods 321a in Embodiment 1 are arranged at intervals along the third direction Z, while the support rods 321a in this Embodiment 2 are arranged at intervals along the second direction Y. In the initial state, the multiple support rods 321a of the buffer 30 can extend parallel to the first direction X. In the compressed state of the buffer 30, the support rods 321a are inclined relative to the first direction X.

[0250] In this second embodiment, the battery cell 100 and the buffer 30 are supported by multiple parallel support rods 321a, which can improve the support stability of the telescopic structure 32 between the two support plates 31, improve the stability of the buffer, and improve the stability of the battery cell 100.

[0251] Example 3, as Figures 10-15As shown, the structure of this embodiment is roughly the same as that of Embodiment 1, with the same reference numerals used for the same components. The only difference is that the telescopic member 321 in Embodiment 1 is formed as a support rod 321a, while there are two telescopic members 321 in this embodiment. Each telescopic member 321 includes a cross unit 3211. The two cross units 3211 are arranged at intervals at both ends of the support plate 31 in the third direction Z. Each cross unit 3211 includes two cross-connected links 32111. The two ends of the two links 32111 are rotatably connected to the two support plates 31 respectively. At least one end of each link 32111 is slidably connected to the support plate 31 in the second direction Y.

[0252] Among them, the connecting rod 32111 is a polycarbonate part, an engineering plastic alloy part, a polyphenylene ether part, or a polyvinyl chloride part.

[0253] In this third embodiment, the telescopic component 321 includes a cross unit 3211. The two connecting rods 32111 of the cross unit 3211 can be connected to the two ends of the support plate 31 respectively, so that the middle part of the support plate 31 is not supported by the connecting rods 32111, thereby further alleviating the problem of excessive expansion of the middle part of the electrode assembly 20 in the later stage.

[0254] Example 4, as Figures 16-17 As shown, the structure of this embodiment is roughly the same as that of embodiment three, with the same components using the same reference numerals. The only difference is that the two cross units 3211 in embodiment three are arranged at both ends of the support plate 31 in the third direction Z, while the two cross units 3211 in this embodiment four are arranged at both ends of the support plate 31 in the second direction Y.

[0255] Example 5, as Figures 18-19 As shown, the structure of this embodiment is roughly the same as that of embodiment three, with the same reference numerals used for the same components. The only difference is that each telescopic member 321 in embodiment three includes a cross unit 3211, while each telescopic member 321 in this embodiment four includes two cross units 3211 connected sequentially along the first direction X, and the connecting rods 32111 at the adjacent ends of the two cross units 3211 are hinged together.

[0256] In this fifth embodiment, by making each telescopic member 321 include multiple cross units 3211, the buffer member 30 can be matched to the compression requirements of the large electrode assembly 20.

[0257] Example 6, as Figures 18-19As shown, the structure of this embodiment is roughly the same as that of embodiment five, with the same reference numerals used for the same components. The only difference is that: in embodiment five, there are two telescopic members 321, which are respectively placed at both ends of the support plate 31 in the third direction Z. Each telescopic member 321 includes two cross units 3211 connected in sequence along the first direction X. In this embodiment six, there are two telescopic members 321, which are respectively placed at both ends of the support plate 31 in the second direction Y. Each telescopic member 321 includes two cross units 3211 connected in sequence along the first direction X.

[0258] Example 7, as Figures 20-23 As shown, the structure of this embodiment is roughly the same as that of Embodiment 1, with the same components using the same reference numerals. The only difference is that the telescopic member 321 in Embodiment 1 is formed as a support rod 321a, while in this embodiment 7, the telescopic member 321 is formed as an elastic member 321b, and the elastic member 321b extends into a long strip along the third direction Z. There are two elastic members 321b, which are respectively arranged at both ends of the support plate 31 in the second direction Y. The opposite side surfaces of the two elastic members 321b in the second direction Y are respectively flush with the end faces of the two support plates 31 in the second direction Y.

[0259] Furthermore, the support plate 31 is a polycarbonate part, an engineering plastic alloy part, a polyphenylene ether part, or a polyvinyl chloride part. The support plate 31 can also be a polypropylene part, a polyethylene part, a polyester fiber part, or a melamine part, and the telescopic part 321 is a polypropylene part, a polyethylene part, a polyester fiber part, or a melamine part.

[0260] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The shell (10) comprises: An electrode assembly (20) arranged in the shell (10); A buffer (30) arranged in the shell (10), the buffer (30) comprising a support plate (31) and a telescopic structure (32), the number of the support plates (31) is two, the two support plates (31) are arranged in a first direction (X) and spaced apart, the first direction (X) is the thickness direction of the electrode assembly (20), at least one of the support plates (31) abuts the electrode assembly (20) in the first direction (X), and the telescopic structure (32) is connected between the two support plates (31) and is telescopic along the first direction (X). In a projection plane perpendicular to the first direction (X), the projection area of the telescopic structure (32) is smaller than the projection area of the support plate (31).

2. The battery cell of claim 1, wherein, The telescopic structure (32) comprises one or more telescopic members (321), and each telescopic member (321) is connected to two support plates (31) at both ends.

3. The battery cell of claim 1, wherein, The telescopic structure (32) comprises a plurality of telescopic members (321), and the plurality of telescopic members (321) are arranged in a second direction (Y) and / or a third direction (Z) and spaced apart, the first direction (X), the second direction (Y) and the third direction (Z) intersect with each other.

4. The battery cell of claim 3, wherein, Two of the plurality of telescopic members (321) are arranged at both ends of the support plate (31) in the second direction (Y) or the third direction (Z).

5. The battery cell of claim 4, wherein, The number of the telescopic members (321) is at least three, and one of the plurality of telescopic members (321) is arranged at a middle position of the support plate (31) in the second direction (Y) or the third direction (Z).

6. The battery cell of claim 5, wherein, Both ends of the telescopic member (321) are rotatably connected to two support plates (31).

7. The battery cell of any one of claims 3-6, wherein, The telescopic member (321) is formed as a support rod (321a) in the shape of a rod.

8. The battery cell of claim 7, wherein, The telescopic member (321) comprises a cross unit (3211), and the cross unit (3211) comprises two connecting rods (32111) which are cross arranged and rotatably connected, and both ends of the two connecting rods (32111) are rotatably connected to two support plates (31).

9. The battery cell of claim 7, wherein, The telescopic member (321) comprises one cross unit (3211), or the telescopic member (321) comprises a plurality of cross units (3211) which are sequentially connected in the first direction (X).

10. The battery cell of claim 9, wherein, The telescopic member (321) is riveted to the support plate (31).

11. The battery cell of claim 7, wherein, The telescopic member (321) is a polycarbonate member, an engineering plastic alloy member, a polyphenyl ether member or a polyvinyl chloride member.

12. The battery cell of claim 7, wherein, The telescopic member (321) is an elastic member (321b) extending in the first direction (X), and the telescopic member (321) is elastically deformable in the first direction (X).

13. The battery cell of any one of claims 3-6, wherein, ​ 14. The battery cell of claim 13, wherein, The telescopic piece (321) is long-strip-shaped in the second direction (Y) or the third direction (Z), and the first direction (X), the second direction (Y) and the third direction (Z) are perpendicular to each other.

15. The battery cell of claim 14, wherein, The telescopic piece (321) is long-strip-shaped in the second direction (Y) and the two ends are flush with the two ends of the support plate (31) in the second direction (Y); or, The telescopic piece (321) is long-strip-shaped in the third direction (Z) and the two ends are flush with the two side edges of the support plate (31) in the third direction (Z).

16. The battery cell of claim 14, wherein, The telescopic piece (321) is arranged between the two support plates (31), and the projection of the telescopic piece (321) is completely located within the projection of the support plate (31); or, At least part of the telescopic piece (321) is arranged on the two sides of the two support plates (31) in the second direction (Y) or the third direction (Z).

17. The battery cell of claim 13, wherein, The two ends of the telescopic piece (321) are adhesively connected to the support plate (31).

18. The battery cell of claim 13, wherein, The telescopic piece (321) is a polypropylene piece, a polyethylene piece, a polyester fiber piece or a melamine piece.

19. The battery cell of claim 1, wherein, The support plate (31) is a polycarbonate piece, an engineering plastic alloy piece, a polyphenyl ether piece or a polyvinyl chloride piece.

20. The battery cell of claim 1, wherein, The support plate (31) is a polypropylene piece, a polyethylene piece, a polyester fiber piece or a melamine piece.

21. The battery cell of claim 1, wherein, The buffer piece (30) is switchable between an initial state and a compressed state, in the initial state, the distance between the side surfaces of the two support plates (31) arranged opposite each other in the first direction (X) is a first size, in the compressed state, the distance between the side surfaces of the two support plates (31) arranged opposite each other is a second size, and the ratio of the second size to the first size is greater than or equal to 0.5 and less than or equal to 0.

8.

22. The battery cell of claim 1, wherein, The number of the electrode assemblies (20) is multiple, and the multiple electrode assemblies (20) are arranged in layers in the first direction (X), and the buffer piece (30) is arranged between two adjacent electrode assemblies (20).

23. The battery cell of claim 1, wherein, The shell (10) is a rectangular parallelepiped, and the electrode assembly (20) is a wound electrode assembly (20).

24. A bumper member characterized by, The buffer piece (30) is the buffer piece (30) in the battery monomer (100) according to any one of claims 1-23.

25. A battery device, characterized by Comprising: The battery monomer (100) according to any one of claims 1-23.

26. An electrical device, comprising: Comprising the battery device (1000) according to claim 25. Comprising the battery device (1000) according to claim 25.

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