Battery devices and electrical equipment

Abstract

This application belongs to the field of battery device technology, specifically relating to a battery device and an electrical appliance. The battery device of this application includes a housing, at least one battery cell, and at least one elastic member. The housing has an internal cavity containing the battery cell and the elastic member. The elastic member includes a first side and a second side arranged opposite to each other along a first direction. The first side has a first recessed portion facing the second side, and the second side has a second recessed portion facing the first side. The first side or the second side is in contact with at least one surface of the battery cell along the first direction, which is the alignment direction of the battery cell and the elastic member. According to the battery device of this application, energy can be effectively absorbed and dissipated through its own elastic deformation, reducing the problems of compression deformation and uneven stress on the battery cell.

Description

Technical Field

[0001] This application belongs to the field of battery equipment technology, specifically relating to a battery device and an electrical device. Background Technology

[0002] In the assembly process of all-solid-state battery systems, buffer pads are typically added between individual cells to achieve uniform stress distribution. However, the material properties of these buffer pads (such as creep relaxation) can cause the pressure between cells to gradually decrease over time, leading to uneven stress distribution. This uneven stress distribution not only affects the cycle life and safety of the battery device but can also significantly impact its electrochemical performance. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the purpose of this application is to provide a battery device and electrical equipment that can effectively solve the problem of uneven stress on individual battery cells.

[0004] In a first aspect, this application provides a battery device, comprising:

[0005] The box has an internal cavity for receiving contents.

[0006] At least one battery cell, the battery cell being disposed within a receiving cavity;

[0007] At least one elastic element is disposed in the receiving cavity. The elastic element includes a first side and a second side disposed opposite to each other along a first direction. The first side is provided with a first recessed portion that is recessed toward the second side, and the second side is provided with a second recessed portion that is recessed toward the first side. The first side or the second side is in contact with at least one surface of the battery cell along the first direction. The first direction is the arrangement direction of the battery cell and the elastic element.

[0008] When the elastic element is compressed, the part of the elastic element used to form the first and second recesses will undergo plastic deformation first due to local stress concentration. As the amount of deformation of the elastic element increases, the elastic element can provide a zero stiffness region within a specific load range.

[0009] According to the battery device of this application, by providing recesses on both sides of the elastic element, the elastic element is formed into a structure roughly similar to a "spring" or a "bellows". This structure can effectively absorb and dissipate energy through its own elastic deformation when subjected to compression or impact. Whether subjected to impact from outside the casing or expansion deformation of the battery cells, the elastic element can effectively buffer the battery cells, reducing the compression deformation of the battery cells and thus reducing problems such as internal short circuits or thermal runaway. Simultaneously, the elastic element, with its roughly "spring" or "bellows" structure, exhibits a zero-stiffness region during compression deformation. Near this zero-stiffness region, the elastic element has a certain displacement to buffer the compressive force, while providing minimal, even close to, elastic reaction, thereby reducing uneven stress among the battery cells.

[0010] In some embodiments of this application, the opening area of ​​the end of the first recess away from the second side is equal to the opening area of ​​the end of the second recess away from the first recess.

[0011] By setting the end openings of the first recess and the second recess to have equal areas, the balance of forces on both sides of the elastic member can be improved, so that the forces on the first side and the second side are basically the same.

[0012] In some embodiments of this application, the depth dimension of the first recess and the depth dimension of the second recess are equal along the first direction.

[0013] By setting the depth dimensions of the first recess and the second recess to be equal, the consistency of deformation on both sides of the elastic element along the first direction can be improved, thereby enabling the elastic element to provide better cushioning force.

[0014] In some embodiments of this application,

[0015] Along the direction from the first side to the second side, the area of ​​the first recessed portion gradually decreases along the cross-section perpendicular to the first direction; and / or,

[0016] Along the direction from the second side to the first side, the area of ​​the second recessed portion gradually decreases along the cross-section perpendicular to the first direction.

[0017] Because the area of ​​the first recessed portion gradually decreases along the cross-section perpendicular to the first direction, it facilitates deformation of the first recessed portion toward the second side when the elastic element is compressed. Similarly, because the area of ​​the second recessed portion gradually decreases along the cross-section perpendicular to the first direction, it facilitates deformation of the second recessed portion toward the first side when the elastic element is compressed.

[0018] In some embodiments of this application,

[0019] The first recess has a circular cross-section perpendicular to the first direction; and / or,

[0020] The second recess has a circular cross-section perpendicular to the first direction.

[0021] By setting the cross-section of the first recess to be circular, it is easier for the first recess to deform toward the second side, reducing the difficulty of deformation caused by the presence of corners in the first recess. Similarly, by setting the cross-section of the second recess to be circular, it is easier for the second recess to deform toward the first side, reducing the difficulty of deformation caused by the presence of corners in the second recess.

[0022] In some embodiments of this application,

[0023] The opening size of the first recess, located at the end opposite to the second side, perpendicular to the first direction, ranges from 15cm to 70cm; and / or,

[0024] The opening size of the second recess, located at the end opposite to the first side, perpendicular to the first direction, ranges from 15cm to 70cm.

[0025] By setting the end opening size of the first recess to 15cm~70cm, the first side can have sufficient rigidity to support the deformation of the battery cell and can effectively provide buffering force. By setting the end opening size of the second recess to 15cm~70cm, the second side can have sufficient rigidity to support the deformation of the battery cell and can effectively provide buffering force.

[0026] In some embodiments of this application, the elastic element includes at least one recessed unit, the recessed unit includes a plurality of first recesses spaced apart along a second direction, and a second recess is provided between any two adjacent first recesses along the second direction, the second direction being perpendicular to the first direction.

[0027] By alternately arranging the first and second recesses along the second direction, the elastic element can be formed in the second direction to form a structure roughly similar to a "spring" or "bellows". This results in a zero-stiffness region appearing in the elastic element along the second direction during the compression deformation process, thereby reducing the problems of compression deformation and uneven stress on the battery cell.

[0028] In some embodiments of this application,

[0029] Along the second direction, the spacing between two adjacent first recesses ranges from 10cm to 63cm; and / or,

[0030] Along the second direction, the spacing between two adjacent second recesses ranges from 10cm to 63cm.

[0031] By setting the spacing between two adjacent first recesses to a range of 10cm to 63cm, the structure between the two adjacent first recesses can have sufficient rigidity, thereby reducing the deformation of the battery cell. Similarly, by setting the spacing between two adjacent second recesses to a range of 10cm to 63cm, the structure between the two adjacent second recesses can have sufficient rigidity, thereby reducing the deformation of the battery cell.

[0032] In some embodiments of this application, the elastic element includes a plurality of recessed units, which are spaced apart along a third direction, with the first direction, the second direction, and the third direction being perpendicular to each other.

[0033] By setting multiple recessed units along the third direction, the elastic element has multiple "spring" or "bellows"-like structures along the third direction, thereby creating multiple zero-stiffness regions along the third direction during the compression deformation process of the elastic element, reducing the problems of compression deformation and uneven stress of the battery cell.

[0034] In some embodiments of this application, the elastic element includes a metal wire mesh.

[0035] The elastic element is formed by weaving metal wire mesh, which gives the elastic element good bending performance and stiffness, thus making it easy for the elastic element to provide buffering force and provide a zero stiffness area during deformation.

[0036] In some embodiments of this application, the battery device includes a plurality of battery cells spaced apart along a first direction, with an elastic element sandwiched between at least two adjacent battery cells.

[0037] By sandwiching an elastic element between at least two adjacent battery cells, the elastic element can provide a buffer force for the battery cells on both sides, and can provide a zero stiffness region during the deformation of the elastic element, thereby reducing the compression deformation and uneven stress of the battery cells on both sides.

[0038] In some embodiments of this application, along a first direction, at least one of the multiple battery cells located at the beginning and end ends is provided with an elastic element between itself and the inner sidewall of the housing.

[0039] By sandwiching an elastic element between at least one battery cell located at one end and the inner wall of the housing, the elastic element can provide a buffering force for at least one battery cell near the inner wall of the housing, and can provide a zero-stiffness area during the deformation of the elastic element, thereby reducing the compression deformation of at least one battery cell.

[0040] In some embodiments of this application, the elastic element is disposed inside the housing in a compressed state.

[0041] By placing the elastic element in a compressed state inside the housing, a pre-tightening force is provided through the elastic element before the battery cell deforms, and the battery cell is squeezed along the first direction, thereby promoting the adhesion between the electrolyte and the electrode inside the battery cell, reducing the interfacial impedance, and thus improving the electrochemical performance of the battery cell.

[0042] In some embodiments of this application, the battery cell includes a first surface with the largest area, the first surface intersects a first direction, and a first side or a second side is attached to the first surface of the battery cell.

[0043] By attaching the first side or the second side to the first surface, the buffering force provided by the elastic element can act on the first surface, thereby dispersing the buffering force of the elastic element compared to the buffering force acting on other surfaces of the battery cell, and thus reducing the deformation of the battery cell.

[0044] In some embodiments of this application, the number of first recesses is greater than the number of second recesses, and one surface of the battery cell along the first direction is in contact with the first side.

[0045] By attaching the first side to the surface of the battery cell, compared to attaching the second side to the surface of the battery cell, the contact area between the elastic element and the battery cell can be reduced, making it easier for the elastic element to deform under pressure and effectively providing cushioning force.

[0046] Secondly, this application provides an electrical device having a battery device having any of the above-mentioned features.

[0047] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0048] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0049] Figure 1 This is a structural schematic diagram of a vehicle provided in one embodiment of this application;

[0050] Figure 2 This is a schematic diagram of the structure of a battery device provided in one embodiment of this application;

[0051] Figure 3 This is a schematic diagram of the structure of a battery cell assembly provided in one embodiment of this application;

[0052] Figure 4 This is an exploded structural diagram of a battery cell provided in one embodiment of this application;

[0053] Figure 5 This is a schematic diagram of the distribution of battery cells and elastic elements in a battery device provided in one embodiment of this application;

[0054] Figure 6 This is a schematic diagram of the structure of the elastic member provided in one embodiment of this application;

[0055] Figure 7 yes Figure 6 A schematic diagram of the AA cross-sectional structure of the elastic element in the diagram.

[0056] The reference numerals in the detailed embodiments are as follows:

[0057] 1. Vehicles;

[0058] 10. Battery assembly; 11. Controller; 12. Motor;

[0059] 20. Battery cell assembly; 21. Battery cell; 211. End cap; 212. Housing; 2121. First surface; 213. Electrode assembly; 214. Electrode terminal;

[0060] 30. Box body; 301. First box body; 302. Second box body; 31. First side panel; 32. Second side panel;

[0061] 40. Elastic element; 41. First side; 42. Second side; 43. Recessed unit; 431. First recessed portion; 432. Second recessed portion;

[0062] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0063] 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.

[0064] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application shall have the ordinary meaning as understood by those skilled in the art to which the embodiments of this application pertain.

[0065] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and other terms indicating the orientation or positional relationship are 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.

[0066] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of embodiments of this application, "a plurality of" means including two or more, unless otherwise explicitly defined.

[0067] In the description of the embodiments of this application, unless otherwise explicitly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0068] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0069] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. Lithium-ion batteries, due to their high energy density, high average open-circuit voltage, and long cycle life, are widely used in mobile and portable electronic devices.

[0070] In the assembly process of all-solid-state battery systems, buffer pads are typically added between individual cells to achieve uniform stress distribution. However, the material properties of these buffer pads (such as creep relaxation) can cause the pressure between cells to gradually decrease over time, leading to uneven stress distribution. This uneven stress distribution not only affects the cycle life and safety of the battery device but can also significantly impact its electrochemical performance.

[0071] To address the problem of uneven stress on individual battery cells, this application proposes a battery device and an electrical appliance incorporating the battery device. According to the battery device and electrical appliance of this application, the battery device can provide effective buffering for individual battery cells, reducing the problems of compression deformation and uneven stress on individual battery cells, thereby reducing the occurrence of internal short circuits or thermal runaway in individual battery cells.

[0072] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0073] In some implementations, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0074] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0075] 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.

[0076] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] In some embodiments, the energy storage device includes one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery modules connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0082] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application can be any power system that requires energy storage devices.

[0083] The technical solutions described in this application are applicable to various electrical devices and energy storage devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, spacecraft and energy storage containers, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0084] Figure 1 This is a schematic diagram of the structure of vehicle 1 provided for some embodiments of this application. For example... Figure 1 As shown, vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1, and the battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1; for example, the battery device 10 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 11 and a motor 12. The controller 11 is used to control the battery device 10 to supply power to the motor 12, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0085] In some embodiments of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0086] Figure 2 This is a schematic diagram of the structure of a battery device 10 according to an embodiment of this application. Figure 3 This is a schematic diagram of the structure of a battery cell assembly 20 according to one embodiment of this application. (In conjunction with...) Figure 2 and Figure 3 As shown, to meet different power demands, the battery device 10 may include multiple battery cells 21, where each battery cell 21 is the smallest unit constituting the battery device 10. Multiple battery cells 21 can be connected in series and / or in parallel via electrode terminals for various applications. Furthermore, the multiple battery cells 21 can be connected in series, in parallel, or in a mixed configuration, where a mixed configuration refers to a combination of series and parallel connections.

[0087] Combination Figure 2 and Figure 3 As shown, the battery device 10 may include multiple battery cell assemblies 20 and a housing 30, with the multiple battery cell assemblies 20 housed inside the housing 30. The housing 30 is used to house the battery cells 21 or battery cell assemblies 20 to reduce the impact of liquids or other foreign objects on the charging or discharging of the battery cells 21. The housing 30 may be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. The material of the housing 30 may be an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0088] In some embodiments, the housing 30 may include a first housing 301 and a second housing 302, which overlap each other, and together define a space for accommodating the battery cell 21. The second housing 302 may be a hollow structure with one end open, and the first housing 301 may be a plate-like structure, with the first housing 301 covering the open side of the second housing 302 so that the first housing 301 and the second housing 302 together define a space for accommodating the battery cell 21; alternatively, the first housing 301 and the second housing 302 may both be hollow structures with one side open, with the open side of the first housing 301 covering the open side of the second housing 302.

[0089] The battery cell assembly 20 may include multiple battery cells 21. These battery cells 21 may be connected in series, parallel, or a combination thereof to form the battery cell assembly 20. The multiple battery cell assemblies 20 may then be connected in series, parallel, or a combination thereof to form the battery device 10. The battery cell 21 may be cylindrical, flat, cuboid, or other shapes, and this application does not limit this. Battery cells 21 are generally classified into three types according to their packaging method: cylindrical battery cells, cuboid battery cells, and pouch battery cells, and this application does not limit this either. However, for the sake of brevity, the following embodiments will use a cuboid lithium-ion battery cell 21 as an example for explanation.

[0090] Figure 4 This is an exploded structural diagram of a battery cell 21 provided for some embodiments of this application. The battery cell 21 refers to the smallest unit constituting the battery device 10. For example... Figure 4 The battery cell 21 includes an end cap 211, a housing 212, and an electrode assembly 213.

[0091] End cap 211 refers to a component that covers the opening of housing 212 to isolate the internal environment of battery cell 21 from the external environment. The shape of end cap 211 can be adapted to the shape of housing 212 to fit it. Optionally, end cap 211 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 211 is not easily deformed under pressure and impact, giving battery cell 21 higher structural strength and improved safety performance. Functional components such as electrode terminals 214 can be provided on end cap 211. Electrode terminals 214 can be used for electrical connection with electrode assembly 213 to output or input electrical energy to battery cell 21. In some embodiments, end cap 211 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 21 reaches a threshold. In some embodiments, an insulating element may be provided on the inner side of the end cap 211. The insulating element can be used to isolate the electrical connection components inside the housing 212 from the end cap 211 to reduce the risk of short circuit. For example, the insulating element may be made of plastic, rubber, etc.

[0092] The housing 212 is a component used to cooperate with the end cap 211 to form the internal environment of the battery cell 21. This internal environment can accommodate the electrode assembly 213, electrolyte (not shown in the figure), and other components. The housing 212 and the end cap 211 can be independent components. An opening can be provided on the housing 212, and the end cap 211 can be used to close the opening to form the internal environment of the battery cell 21. Alternatively, the end cap 211 and the housing 212 can be integrated. Specifically, the end cap 211 and the housing 212 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 212, the end cap 211 closes the housing 212. The housing 212 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 212 can be determined according to the specific shape and size of the electrode assembly 213. The housing 212 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0093] Electrode assembly 213 is the component in the battery cell 21 where the electrochemical reaction occurs. The casing 212 may contain one or more electrode assemblies 213. Electrode assembly 213 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of electrode assembly 213, while the portions of the positive and negative electrode sheets without active material each constitute a tab (not shown in the figure). The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 214 to form a current loop.

[0094] Combination Figure 2 , Figures 5 to 7As shown, a first aspect of this application provides a battery device 10. In some embodiments of this application, the battery device 10 includes a housing 30, at least one battery cell 21, and at least one elastic member 40. The housing 30 has a receiving cavity formed inside, the battery cell 21 is disposed in the receiving cavity, and the elastic member 40 is disposed in the receiving cavity. The elastic member 40 includes a first side 41 and a second side 42 disposed opposite to each other along a first direction X. The first side 41 has a first recess 431 recessed toward the second side 42, and the second side 42 has a second recess 432 recessed toward the first side 41. The first side 41 or the second side 42 is in contact with at least one surface of the battery cell 21 along the first direction X, where the first direction X is the arrangement direction of the battery cell 21 and the elastic member 40. When the elastic member 40 is compressed, the portion of the elastic member 40 that forms the first recess 431 and the second recess 432 undergoes plastic deformation first due to local stress concentration. As the deformation of the elastic member 40 increases, the elastic member 40 can provide a zero-stiffness region within a specific load range.

[0095] Specifically, the housing 30 forms the overall appearance structure of the battery device 10 and protects the battery cells 21 located inside it.

[0096] The number of at least one battery cell 21 can be one or more. When there are multiple battery cells 21, they can be housed together in the receiving cavity of the housing 30 and form at least one battery cell assembly 20 by series, parallel, or mixed connection, thereby increasing the output power of the battery device 10. For ease of description, this application will only illustrate the case where there are multiple battery cells 21 and multiple battery cells 21 form a battery cell assembly 20.

[0097] The number of at least one elastic element 40 can be one or more. When there are multiple elastic elements 40, they can be respectively disposed between adjacent battery cells 21, or disposed between the battery cell 21 and the inner sidewall of the housing 30, and in contact with the battery cell 21, thereby providing a buffering force for the battery cell 21 when it deforms. The deformation of the battery cell 21 includes deformation caused by external force, or deformation due to expansion of the battery cell 21 itself.

[0098] In this configuration, at least one side of the battery cell 21 along the first direction X is provided with an elastic element 40. The elastic element 40 includes a first side 41 and a second side 42 disposed on opposite sides along the first direction X. One of the first side 41 and the second side 42 is in contact with at least one surface of the battery cell 21. Optionally, when the battery cell 21 is disposed between two adjacent battery cells 21 along the first direction X, the first side 41 of the elastic element 40 is in contact with one of the battery cells 21, and the second side 42 of the elastic element 40 is in contact with the other battery cell 21. When the battery cell 21 is disposed between the battery cell 21 and the inner wall of the housing 30 along the first direction X, one of the first side 41 and the second side 42 of the elastic element 40 is in contact with the battery cell 21, and the other of the first side 41 and the second side 42 of the elastic element 40 is in contact with the inner wall of the housing 30. The first side 41 has a first recessed portion 431 that is recessed towards the second side 42. When the first side 41 is in contact with the battery cell 21, the first recessed portion 431 is spaced apart from the battery cell 21, forming a buffer space between them. The second side 42 has a second recessed portion 432 that is recessed towards the first side 41. When the second side 42 is in contact with the battery cell 21, the second recessed portion 432 is spaced apart from the battery cell 21, forming a buffer space between them. When the elastic member 40 is compressed, the portion of the elastic member 40 that forms the first and second recessed portions 431 undergoes plastic deformation first due to local stress concentration, at which point the overall stiffness of the elastic member 40 decreases. As the deformation of the elastic member 40 increases, the area of ​​the elastic member 40 that is in contact with the inner wall of the battery cell 21 or the housing 30 gradually participates in the stress, thereby providing a zero-stiffness area for the elastic member 40 within a specific load range.

[0099] According to the battery device 10 of this application, by providing recesses on both sides of the elastic member 40, the elastic member 40 forms a structure roughly similar to a "spring" or a "bellows". When subjected to compression or impact, this structure can effectively absorb and dissipate energy through its own elastic deformation. Whether subjected to impact from outside the housing 30 or expansion deformation of the battery cell 21, the elastic member 40 can provide effective buffering for the battery cell 21, reducing the compression deformation of the battery cell 21, and thus reducing problems such as internal short circuits or thermal runaway of the battery cell 21. At the same time, the elastic member 40, which forms a structure roughly similar to a "spring" or a "bellows", will have a zero stiffness region during the compression deformation process. Near the zero stiffness region, the elastic member 40 has a certain displacement to buffer the compression force, and the elastic reaction provided is extremely small, even close to zero, thereby reducing the uneven force between the battery cells 21.

[0100] Combination Figures 5 to 7As shown, in some embodiments of this application, the opening area of ​​the end of the first recess 431 away from the second side 42 is equal to the opening area of ​​the end of the second recess 432 away from the first recess 431.

[0101] Specifically, the opening at the end of the first recess 431 opposite to the second side 42 is formed on the surface of the first side 41, and the opening at the end of the second recess 432 opposite to the first side 41 is formed on the surface of the second side 42, and the area of ​​a single opening formed on the first side 41 is equal to the area of ​​a single opening formed on the second side 42. Optionally, the opening shape can be a regular opening such as a circular opening or a square opening, or the opening shape can be an irregular opening.

[0102] By setting the end openings of the first recess 431 and the second recess 432 to have equal areas, the balance of forces on both sides of the elastic member 40 can be improved, so that the forces on the first side 41 and the second side 42 are basically the same.

[0103] Combination Figures 5 to 7 As shown, in some embodiments of this application, along the first direction X, the depth dimension of the first recess 431 and the depth dimension of the second recess 432 are equal.

[0104] Specifically, along the first direction, the depth dimension of the first recess is D1, and the depth dimension of the second recess is D2, where D1 equals D2. Optionally, the elastic member 40 is a plate-like structure with a certain thickness, and the plate-like structure is arranged parallel to both sides along the first direction X. A first recess 431 and a second recess 432 can be formed on both sides of the surface of the elastic member 40, respectively. Since D1 equals D2, that is, the bottom thickness corresponding to the first recess 431 is equal to the bottom thickness corresponding to the second recess 432, thereby giving both sides approximately equal support performance.

[0105] By setting the depth dimension of the first recess 431 and the depth dimension of the second recess 432 to be equal, the consistency of the deformation of both sides of the elastic member 40 along the first direction X can be improved, thereby enabling the elastic member 40 to provide better cushioning force.

[0106] Combination Figures 5 to 7 As shown in some embodiments of this application,

[0107] Along the direction from the first side 41 to the second side 42, the area of ​​the first recess 431 gradually decreases along a cross-section perpendicular to the first direction X; and / or,

[0108] Along the direction from the second side 42 to the first side 41, the area of ​​the second recess 432 along the cross section perpendicular to the first direction X gradually decreases.

[0109] Specifically, the first recess 431 has multiple cross-sections along a direction perpendicular to the first direction X. And along the direction from the first side 41 to the second side 42, the area of ​​the multiple cross-sections of the first recess 431 gradually decreases, thereby forming a generally conical structure on the inner wall of the first recess 431.

[0110] Along a direction perpendicular to the first direction X, the second recess 432 has multiple cross-sections. And along the direction from the second side 42 to the first side 41, the area of ​​the multiple cross-sections of the second recess 432 gradually decreases, thereby forming a generally conical structure on the inner wall of the second recess 432.

[0111] As the area of ​​the first recess 431 gradually decreases along the cross-section perpendicular to the first direction X, when the elastic member 40 is compressed, the first recess 431 is easily deformed toward the second side 42. As the area of ​​the second recess 432 gradually decreases along the cross-section perpendicular to the first direction X, when the elastic member 40 is compressed, the second recess 432 is easily deformed toward the first side 41.

[0112] Combination Figures 5 to 7 As shown in some embodiments of this application,

[0113] The first recess 431 has a circular cross-section perpendicular to the first direction X; and / or,

[0114] The second recess 432 has a circular cross-section perpendicular to the first direction X.

[0115] Specifically, along the direction perpendicular to the first direction X, any cross-section of the first recess 431 is circular. Optionally, along the direction from the first side 41 to the second side 42, the area of ​​the circle gradually decreases, thereby forming a conical inner wall surface of the first recess 431.

[0116] Along the direction perpendicular to the first direction X, any cross-section of the second recess 432 is circular. Optionally, along the direction from the second side 42 to the first side 41, the area of ​​the circle gradually decreases, thereby forming a conical inner wall surface of the second recess 432.

[0117] By setting the cross-section of the first recess 431 to be circular, it is easier for the first recess 431 to deform toward the second side 42, reducing the difficulty of deformation caused by the presence of corners in the first recess 431. By setting the cross-section of the second recess 432 to be circular, it is easier for the second recess 432 to deform toward the first side 41, reducing the difficulty of deformation caused by the presence of corners in the second recess 432.

[0118] Combination Figures 5 to 7 As shown in some embodiments of this application,

[0119] The opening size of the first recess 431 at the end opposite to the second side 42, perpendicular to the first direction X, ranges from 15cm to 70cm; and / or,

[0120] The opening size of the second recess 432 at the end opposite to the first side 41 along the first direction X ranges from 15cm to 70cm.

[0121] Specifically, along a single direction perpendicular to the first direction X, the opening size of the first recess 431 is L1, and the value of L1 ranges from 15cm to 70cm. Optionally, the opening size of the first recess 431 can be any value between 15cm…20cm…50cm…65cm…70cm. Optionally, when the opening at the end of the first recess 431 opposite to the second side 42 is a circular opening, the diameter of the circular opening ranges from 15cm to 70cm.

[0122] Along a single direction perpendicular to the first direction X, the opening size of the second recess 432 ranges from 15cm to 70cm. Optionally, the opening size of the second recess 432 can be any value between 15cm…20cm…50cm…65cm…70cm. Optionally, when the opening at the end of the second recess 432 opposite to the first side 41 is a circular opening, the diameter of the circular opening ranges from 15cm to 70cm.

[0123] By setting the end opening size of the first recess 431 to 15cm~70cm, the first side 41 can have sufficient rigidity to support the deformation of the battery cell 21 and can effectively provide buffering force. By setting the end opening size of the second recess 432 to 15cm~70cm, the second side 42 can have sufficient rigidity to support the deformation of the battery cell 21 and can effectively provide buffering force.

[0124] Combination Figures 5 to 7 As shown, in some embodiments of this application, the elastic member 40 includes at least one recessed unit 43, the recessed unit 43 includes a plurality of first recessed portions 431 spaced apart along the second direction Y, and a second recessed portion 432 is provided between any two adjacent first recessed portions 431 along the second direction Y, the second direction Y being perpendicular to the first direction X.

[0125] Specifically, the recessed unit 43 includes at least two first recessed portions 431 spaced apart along the second direction Y, and a second recessed portion 432 is provided between any two adjacent first recessed portions 431 along the second direction Y, and the first recessed portions 431 and the second recessed portions 432 are alternately arranged sequentially. Optionally, such as Figure 6 and Figure 7As shown, the recessed unit 43 includes four first recessed portions 431 spaced apart along the second direction Y, and three second recessed portions 432 spaced apart along the second direction Y, with the four first recessed portions 431 and the three second recessed portions 432 alternately arranged sequentially. A portion of the elastic member 40 is disposed between the first recessed portions 431 and the second recessed portions 432, thereby separating the first recessed portions 431 and the second recessed portions 432. Optionally, the thickness of the partial sidewalls of the first recessed portions and the second recessed portions 432 is W, where W ranges from 1 cm to 5 cm. Two adjacent first recessed portions 431 refer to two first recessed portions 431 that have one second recessed portion 432 sandwiched between them.

[0126] By alternately arranging the first recess 431 and the second recess 432 along the second direction Y, the elastic member 40 can be formed in the second direction Y to form a structure that is roughly similar to a "spring" or a "bellows". This allows the elastic member 40 to have a zero stiffness region along the second direction Y during the compression deformation process, thereby reducing the compression deformation of the battery cell 21.

[0127] Combination Figures 5 to 7 As shown in some embodiments of this application,

[0128] Along the second direction Y, the spacing between two adjacent first recesses 431 ranges from 10cm to 63cm; and / or,

[0129] Along the second direction Y, the spacing between two adjacent second recesses 432 ranges from 10cm to 63cm.

[0130] Specifically, the first side 41 has a plurality of first recesses 431 formed along the second direction Y, and the portion between two adjacent first recesses 431 abuts against the inner wall of the battery cell 21 or the casing 30. The spacing between two adjacent first recesses 431 is L2, and the size of L2 ranges from 10cm to 63cm. Optionally, the spacing between two adjacent first recesses 431 can be any value between 10cm…15cm…30cm…55cm…63cm…

[0131] The second side 42 has a plurality of second recesses 432 formed along the second direction Y. The portion between two adjacent second recesses 432 abuts against the inner sidewall of the battery cell 21 or the housing 30, and the size ranges from 10cm to 63cm. Optionally, the spacing between two adjacent second recesses 432 can be any value between 10cm…15cm…30cm…55cm…63cm….

[0132] By setting the spacing between two adjacent first recesses 431 to a range of 10cm to 63cm, the structure between the two adjacent first recesses 431 can have sufficient rigidity, thereby reducing the deformation of the battery cell 21. Similarly, by setting the spacing between two adjacent second recesses 432 to a range of 10cm to 63cm, the structure between the two adjacent second recesses 432 can have sufficient rigidity, thereby reducing the deformation of the battery cell 21.

[0133] Combination Figures 5 to 7 As shown, in some embodiments of this application, the elastic element 40 includes a plurality of recessed units 43, which are spaced apart along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0134] Specifically, multiple recessed units 43 are spaced apart along a third direction Z, and each recessed unit 43 includes a first recessed portion 431 and a second recessed portion 432 alternately arranged along a second direction Y. This results in the elastic member 40 having multiple first recessed portions 431 along both the second direction Y and the third direction Z, and multiple second recessed portions 432 along both directions. Optionally, the multiple first recessed portions 431 are arranged in an array on the first side 41. Optionally, the multiple second recessed portions 432 are arranged in an array on the second side 42. Optionally, the first direction X can be the length direction of the battery device 10, the second direction Y can be the width direction of the battery device 10, and the third direction Z can be the height direction of the battery device 10.

[0135] By setting multiple recessed units 43 along the third direction Z, the elastic element 40 has multiple structures similar to "springs" or "bellows" along the third direction Z, thereby causing multiple zero-stiffness regions to appear along the third direction Z during the compression deformation of the elastic element 40, reducing the compression deformation and uneven stress of the battery cell 21.

[0136] Combination Figures 5 to 7 As shown, in some embodiments of this application, the elastic element 40 includes a metal wire mesh.

[0137] Specifically, the elastic element 40 includes a metal wire mesh, which is woven to form the elastic element.

[0138] The elastic element 40 is formed by weaving metal wire mesh, which gives the elastic element 40 good bending performance and stiffness, thus making it easy for the elastic element 40 to provide buffering force and provide a zero stiffness area during deformation.

[0139] Combination Figures 5 to 7As shown, in some embodiments of this application, the battery device 10 includes a plurality of battery cells 21 spaced apart along a first direction X, and an elastic member 40 is sandwiched between at least two adjacent battery cells 21.

[0140] Specifically, multiple battery cells 21 are spaced apart along the first direction X within the receiving cavity of the housing 30, and each pair of adjacent battery cells 21 along the first direction X is provided with an elastic element 40. The first side 41 of the elastic element 40 is in contact with one of the battery cells 21, and the second side 42 of the elastic element 40 is in contact with the other battery cell 21.

[0141] By sandwiching an elastic element 40 between at least two adjacent battery cells 21, the elastic element 40 can provide buffer force for the battery cells 21 on both sides respectively, and can provide a zero stiffness area during the deformation process of the elastic element 40, thereby reducing the compression deformation and uneven force of the battery cells 21 on both sides.

[0142] Combination Figures 5 to 7 As shown, in some embodiments of this application, along the first direction X, at least one of the battery cells 21 located at the beginning and end ends is provided with an elastic member 40 between it and the inner sidewall of the housing 30.

[0143] Specifically, the housing 30 includes a first side plate 31 and a second side plate 32 disposed opposite to each other along a first direction X, with the first side plate 31 and the second side plate 32 each having an inner sidewall facing each other. At least one of the first side plate 31 and the second side plate 32 is provided with an elastic element 40 sandwiched between it and the battery cell 21. Optionally, along the first direction X, the battery cells 21 located at both ends of the plurality of battery cells 21 are respectively sandwiched with elastic elements 40 between them and the first side plate 31 and the second side plate 32.

[0144] By sandwiching an elastic element 40 between at least one battery cell 21 located at both ends of the battery cell 21 and the inner sidewall of the housing 30, the elastic element 40 can provide a buffering force for at least one battery cell 21 near the inner sidewall of the housing 30, and can provide a zero stiffness area during the deformation of the elastic element 40, thereby reducing the compression deformation of at least one end of the battery cell 21.

[0145] Combination Figures 5 to 7 As shown, in some embodiments of this application, the elastic element 40 is disposed inside the housing 30 in a compressed state.

[0146] Specifically, in its natural state, i.e., without stretching or compression, the elastic element 40 has a dimension along the first direction X that is larger than the spacing between two adjacent battery cells 21. Thus, when the elastic element 40 and the battery cells 21 are installed together inside the housing 30, the elastic element 40 is compressed and sandwiched between two adjacent battery cells 21, or the elastic element 40 is compressed and sandwiched between two battery cells 21 and the inner sidewall of the housing 30.

[0147] By placing the elastic element 40 in a compressed state inside the housing 30, that is, by providing a pre-tightening force through the elastic element 40 before the battery cell 21 is deformed, and squeezing the battery cell 21 along the first direction X, the adhesion between the electrolyte and the electrode in the battery cell 21 is promoted, the interfacial resistance is reduced, and the electrochemical performance of the battery cell 21 is improved.

[0148] Combination Figures 4 to 7 As shown, in some embodiments of this application, the battery cell 21 includes a first surface 2121 with the largest area, the first surface 2121 intersects with the first direction X, and the first side 41 or the second side 42 is attached to the first surface 2121 of the single battery cell 21.

[0149] Specifically, the battery cell 21 has multiple surfaces. The surface with the largest area is the first surface 2121. The first surface 2121 intersects the first direction X, thus facilitating the contact between the first side 41 or the second side 42 and the first surface 2121 along the first direction X. Optionally, the first surface 2121 is perpendicular to the first direction X. Optionally, the battery cell 21 is a cuboid battery cell, including two first surfaces 2121 located on opposite sides along the first direction X, and each of the two first surfaces 2121 is perpendicular to the first direction X. An elastic member 40 is attached to each of the two first surfaces 2121.

[0150] By attaching the first side 41 or the second side 42 to the first surface 2121, the buffering force provided by the elastic member 40 can act on the first surface 2121, thereby dispersing the buffering force of the elastic member 40 compared to the buffering force acting on other surfaces of the battery cell 21, and thus reducing the deformation of the battery cell 21.

[0151] Combination Figures 5 to 7 As shown, in some embodiments of this application, the number of first recesses 431 is greater than the number of second recesses 432, and one of the surfaces of the battery cell 21 along the first direction X is in contact with the first side 41.

[0152] Specifically, the number of first recesses 431 is greater than the number of second recesses 432, that is, the number of openings on the first side 41 is greater than the number of openings on the second side 42. Furthermore, when the battery cell 21 is in contact with the elastic member 40, one side of the battery cell 21 is in contact with the first side 41. Optionally, when the battery cell 21 has elastic members 40 on both sides along the first direction X, at least one side of the elastic member 40 has its first side 41 in contact with the battery cell 21. Optionally, when only one side of the battery cell 21 is in contact with the elastic member 40 along the first direction X, the first side 41 of the elastic member 40 is in contact with the battery cell 21.

[0153] By attaching the first side 41 to the surface of the battery cell 21, compared to attaching the second side 42 to the surface of the battery cell 21, the contact area between the elastic member 40 and the battery cell 21 can be reduced, thereby making it easier for the elastic member 40 to deform when squeezed and effectively providing cushioning force.

[0154] like Figure 1 As shown, a second aspect of this application provides an electrical device that includes the battery device 10 described above.

[0155] Since the electrical device in this application has the same technical features as the battery device 10 in any of the above embodiments and can achieve the same technical effect, it will not be described again here.

[0156] like Figure 1 As shown, in some embodiments of this application, the electrical device can be a vehicle 1, which includes a battery device 10 according to any of the above embodiments. The battery device 10 is used to provide electrical energy to the vehicle 1 and to drive the vehicle 1 to move.

[0157] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below.

[0158] Combination Figure 2 , Figures 4 to 7As shown, in some embodiments of this application, the battery device 10 includes a housing 30, at least one battery cell 21, and at least one elastic member 40. The housing 30 has an internal cavity, in which the battery cell 21 is disposed and the elastic member 40 is disposed. The elastic member 40 includes a first side 41 and a second side 42 disposed opposite to each other along a first direction X. The first side 41 has a first recess 431 recessed toward the second side 42, and the second side 42 has a second recess 432 recessed toward the first side 41. The first side 41 or the second side 42 is in contact with at least one surface of the battery cell 21 along the first direction X, which is the arrangement direction of the battery cell 21 and the elastic member 40. When the elastic member 40 is compressed, the portion of the elastic member 40 that forms the first recess 431 and the second recess 432 undergoes plastic deformation first due to local stress concentration. As the deformation of the elastic member 40 increases, the elastic member 40 can provide a zero-stiffness region within a specific load range.

[0159] Optionally, the opening area of ​​the end of the first recess 431 opposite to the second side 42 is equal to the opening area of ​​the end of the second recess 432 opposite to the first recess 431.

[0160] Optionally, along the first direction X, the depth dimension of the first recess 431 and the depth dimension of the second recess 432 are equal.

[0161] Optionally, along the direction from the first side 41 to the second side 42, the area of ​​the first recess 431 in the cross-section perpendicular to the first direction X gradually decreases. Similarly, along the direction from the second side 42 to the first side 41, the area of ​​the second recess 432 in the cross-section perpendicular to the first direction X gradually decreases.

[0162] Optionally, the first recess 431 has a circular cross-section along the first direction X. The second recess 432 has a circular cross-section along the first direction X.

[0163] Optionally, the opening size of the first recess 431 at the end opposite to the second side 42 along the first direction X is in the range of 15cm to 70cm. The opening size of the second recess 432 at the end opposite to the first side 41 along the first direction X is in the range of 15cm to 70cm.

[0164] Optionally, the elastic element 40 includes at least one recessed unit 43, the recessed unit 43 includes a plurality of first recessed portions 431 spaced apart along the second direction Y, and a second recessed portion 432 is provided between any two adjacent first recessed portions 431 along the second direction Y, the second direction Y being perpendicular to the first direction X.

[0165] Optionally, along the second direction Y, the spacing between two adjacent first recesses 431 ranges from 10cm to 63cm. Similarly, along the second direction Y, the spacing between two adjacent second recesses 432 ranges from 10cm to 63cm.

[0166] Optionally, the elastic element 40 includes a plurality of recessed units 43, which are spaced apart along a third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0167] Optionally, the elastic element 40 includes a wire mesh.

[0168] Optionally, the battery device 10 includes a plurality of battery cells 21 spaced apart along a first direction X, with an elastic member 40 sandwiched between at least two adjacent battery cells 21.

[0169] Optionally, along the first direction X, at least one of the battery cells 21 located at the beginning and end is provided with an elastic element 40 between it and the inner sidewall of the housing 30.

[0170] Optionally, the elastic element 40 is located inside the housing 30 in a compressed state.

[0171] Optionally, the battery cell 21 includes a first surface 2121 with the largest area, which intersects with the first direction X. The number of first recesses 431 is greater than the number of second recesses 432, and the first surface 2121 is in contact with the first side 41.

[0172] 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 various 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 device, characterized in that, include: The box body has an internal cavity for receiving; At least one battery cell, the battery cell being disposed within the receiving cavity; At least one elastic element is disposed within the receiving cavity. The elastic element is a plate-like structure with a certain thickness. The elastic element includes multiple recessed units, which are spaced apart along a third direction. Each recessed unit includes multiple first recessed portions spaced apart along a second direction. A second recessed portion is provided between any two adjacent first recessed portions along the second direction. The elastic element includes a first side and a second side arranged opposite to each other along a first direction. The first side has a first recessed portion recessed towards the second side, and the second side has a second recessed portion recessed towards the first side. The opening area of ​​the end of the first recessed portion facing away from the second side is equal to the opening area of ​​the end of the second recessed portion facing away from the first recessed portion. The first side or the second side is in contact with at least one surface of the battery cell along the first direction. The first direction is the arrangement direction of the battery cell and the elastic element. The first direction, the second direction, and the third direction are perpendicular to each other. When the elastic element is compressed, the portion of the elastic element used to form the first and second recesses undergoes plastic deformation first due to local stress concentration. As the deformation of the elastic element increases, the elastic element can provide a zero-stiffness region within a specific load range.

2. The battery device according to claim 1, characterized in that, Along the first direction, the depth dimension of the first recess and the depth dimension of the second recess are equal.

3. The battery device according to claim 1, characterized in that, Along the direction from the first side to the second side, the area of ​​the first recessed portion gradually decreases along a cross-section perpendicular to the first direction; and / or, Along the direction from the second side to the first side, the area of ​​the second recessed portion gradually decreases along the cross-section perpendicular to the first direction.

4. The battery device according to claim 1, characterized in that, The first recess has a circular cross-section perpendicular to the first direction; and / or, The second recess has a circular cross-section perpendicular to the first direction.

5. The battery device according to claim 1, characterized in that, The opening size of the end of the first recess opposite to the second side, perpendicular to the first direction, ranges from 15cm to 70cm; and / or, The opening size of the second recessed portion at the end opposite to the first side, perpendicular to the first direction, ranges from 15cm to 70cm.

6. The battery device according to any one of claims 1 to 5, characterized in that, Along the second direction, the spacing between two adjacent first recesses ranges from 10cm to 63cm; and / or, Along the second direction, the spacing between two adjacent second recesses ranges from 10cm to 63cm.

7. The battery device according to any one of claims 1 to 5, characterized in that, The elastic element includes a metal wire mesh.

8. The battery device according to any one of claims 1 to 5, characterized in that, The battery device includes a plurality of battery cells spaced apart along the first direction, and the elastic element is sandwiched between at least two adjacent battery cells.

9. The battery device according to any one of claims 1 to 5, characterized in that, Along the first direction, at least one of the battery cells located at the beginning and end ends is sandwiched between the elastic element and the inner sidewall of the housing.

10. The battery device according to any one of claims 1 to 5, characterized in that, The elastic element is located inside the housing in a compressed state.

11. The battery device according to any one of claims 1 to 5, characterized in that, The battery cell includes a first surface with the largest area, the first surface intersects with the first direction, and the first side or the second side is attached to the first surface of the battery cell.

12. The battery device according to any one of claims 1 to 5, characterized in that, The number of the first recesses is greater than the number of the second recesses, and one of the surfaces of the battery cell along the first direction is in contact with the first side.

13. An electrical appliance, characterized in that, A battery device having any one of claims 1 to 12.

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