Battery device and electric appliance

Abstract

The application belongs to the technical field of battery equipment, and particularly relates to a battery device and an electric equipment. The battery device comprises a supporting frame, a battery monomer assembly and at least one elastic mechanism. The supporting frame is surrounded to form a mounting cavity. The battery monomer assembly comprises a plurality of battery monomers arranged in the mounting cavity in sequence along a first direction. At least one side inner wall of the mounting cavity and the battery monomer assembly are provided with the elastic mechanism along the first direction. The elastic mechanism comprises a plurality of magnet assemblies and at least one elastic piece. At least one magnet assembly of the plurality of magnet assemblies is configured to move towards another magnet assembly under the action of an expansion force of the battery monomer assembly and provide negative stiffness. The elastic piece is configured to be extruded and deformed under the action of the expansion force of the battery monomer assembly and provide positive stiffness. The positive stiffness and the negative stiffness are configured to be capable of matching each other and provide quasi-zero stiffness for the elastic mechanism. The battery device can reduce the problem of uneven force of the battery monomers.

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 stacked pouch cells, buffer pads are typically added between the individual cells to achieve uniform stress distribution. However, the material properties of these buffer pads (such as creep relaxation) can cause the pressure between the 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] A support frame, which encloses an installation cavity;

[0006] A battery cell assembly includes a plurality of battery cells arranged sequentially in a mounting cavity along a first direction;

[0007] At least one elastic mechanism is provided along a first direction between the inner wall of at least one side of the mounting cavity and the battery cell assembly. The elastic mechanism includes a plurality of magnet assemblies and at least one elastic element. At least one of the plurality of magnet assemblies is configured to move toward another magnet assembly under the expansion force of the battery cell assembly and provide negative stiffness to the elastic mechanism through the interaction force between the plurality of magnet assemblies. The elastic element is configured to be compressed and deformed under the expansion force of the battery cell assembly and provide positive stiffness to the elastic mechanism through the deformed elastic element. The positive stiffness and negative stiffness are configured to match each other and provide quasi-zero stiffness to the elastic mechanism.

[0008] The plurality of magnet components include a first magnet component, a second magnet component, and a third magnet component spaced apart along the first direction. The first magnet component includes a first magnet, the second magnet component includes a second magnet, and the third magnet component includes a third magnet. The first magnet is located on the side of the second magnet facing the battery cell assembly, and the third magnet is located on the side of the second magnet away from the battery cell assembly. The magnetic field directions of the first magnet, the second magnet, and the third magnet are the same, and their magnetic field strengths are equal.

[0009] According to the battery device of this application, the first magnet and the third magnet provide tensile force to the second magnet in opposite directions. When the first magnet assembly, the second magnet assembly, and the third magnet assembly are jointly squeezed by the battery cell assembly, they can provide negative stiffness to the elastic mechanism. The elastic element is configured to be squeezed and deformed under the expansion force of the battery cell assembly, and the deformed elastic element provides positive stiffness to the elastic mechanism. Thus, the elastic mechanism has quasi-zero stiffness through the cooperation of multiple magnets and elastic elements. The output force of the elastic mechanism with quasi-zero stiffness does not change with the displacement of the elastic mechanism. That is, the displacement change generated when the battery cell in the battery cell assembly expands does not affect the reaction force of the elastic mechanism on the battery cell assembly. In other words, the reaction force of the elastic mechanism with quasi-zero stiffness on the battery cell assembly is a constant force. Therefore, it can reduce the problem of uneven force on the battery cell and improve the electrical performance and operational reliability of the battery device.

[0010] In some embodiments of this application, the spacing between the first magnet assembly and the third magnet assembly is fixed along a first direction, the second magnet assembly is configured to move toward the third magnet assembly under the expansion force of the battery cell assembly, and an elastic element is sandwiched between the second magnet assembly and the third magnet assembly.

[0011] By fixing the spacing between the first magnet assembly and the third magnet assembly, and allowing the second magnet assembly to move toward the third magnet assembly under the expansion force of the battery cell assembly, the second and third magnet assemblies together compress the elastic element to deform, thereby providing positive stiffness to the elastic mechanism, while the first, second, and third magnet assemblies provide negative stiffness to the elastic mechanism.

[0012] In some embodiments of this application, the first magnet assembly further includes a first support plate, the second magnet assembly further includes a second support plate, and the third magnet assembly further includes a third support plate. Along a first direction, the first support plate, the second support plate, and the third support plate are arranged sequentially and at intervals. The first magnet is disposed on the side of the first support plate away from the battery cell assembly, and the third magnet is disposed on the side of the third support plate facing the battery cell assembly. The second support plate has a through opening, and the second magnet is disposed in the opening of the second support plate. An elastic member is sandwiched between the second support plate and the third support plate.

[0013] By setting up a first support plate, a second support plate, and a third support plate, and connecting the first magnet, the second magnet, and the third magnet to the first support plate, the relative positions of the first magnet, the second magnet, and the third magnet can be set, thereby providing negative stiffness to the elastic mechanism through the combination of the first magnet, the second magnet, and the third magnet.

[0014] In some embodiments of this application, the elastic mechanism further includes a support rod and an abutment plate. The abutment plate abuts against the battery cell assembly along a first direction, and the two ends of the support rod along the first direction are respectively connected to the abutment plate and a second support plate. The support rod is inserted through the first support plate in a manner that allows it to move along the first direction.

[0015] The second support plate is connected to the abutment plate via a support rod. When the battery cell assembly expands and deforms, it can squeeze the abutment plate and push the second support plate toward the third magnet assembly via the support rod, thereby increasing the distance between the second magnet and the first magnet and decreasing the distance between the second magnet and the third magnet. Thus, the combination of the first magnet, the second magnet and the third magnet provides negative stiffness to the elastic mechanism.

[0016] In some embodiments of this application, the first magnet, the second magnet, and the third magnet each comprise a Heilbeck magnetic array.

[0017] The Helbeck magnetic array can generate a strong magnetic field within its effective range, and the magnetic field distribution is uniform with little magnetic leakage, thereby improving the stability of the relative movement of the first, second, and third magnet components.

[0018] In some embodiments of this application, any one of the first magnet, the second magnet, and the third magnet is provided with multiple Hellbeck magnetic arrays. The multiple Hellbeck magnetic arrays in the same magnet are arranged side by side along a direction perpendicular to the first direction. Any two Hellbeck magnetic arrays in the same magnet have the same magnetic field direction and the same magnetic field strength.

[0019] By arranging multiple Hellbeck magnetic arrays in the same magnet side by side in a direction perpendicular to the first direction, and setting any two Hellbeck magnetic arrays in the same magnet to have the same magnetic field direction and equal magnetic field strength, the magnetic field strength of the elastic mechanism can be effectively improved. As a result, the auxiliary stiffness provided by the first magnet, the second magnet, and the third magnet can match the positive stiffness provided by the elastic element, and ultimately provide quasi-zero stiffness for the elastic mechanism.

[0020] In some embodiments of this application, the battery device further includes a guide, the battery cell assembly having a guide on at least one side along a direction perpendicular to the first direction, and the second magnet assembly being connected to the guide in a manner that allows it to slide along the first direction.

[0021] By connecting the second magnet assembly to the guide in a manner that allows it to slide along the first direction, the smoothness of the operation of the second magnet assembly relative to the first and third magnet assemblies can be improved.

[0022] In some embodiments of this application, the first magnet assembly and the third magnet assembly are respectively connected to the support frame, and their positions relative to the support frame are fixed.

[0023] By connecting the first magnet assembly and the third magnet assembly to the support frame respectively, the relative positions of the first magnet assembly and the third magnet assembly are kept fixed, so that the positional relationship between the second magnet and the first magnet and the third magnet can be adjusted by moving the second magnet assembly.

[0024] In some embodiments of this application, there are two elastic mechanisms. Along the first direction, an elastic mechanism is provided between the inner walls of the opposite sides of the mounting cavity and the battery cell assembly.

[0025] By providing an elastic mechanism on each side of the battery cell assembly along the first direction, the elastic mechanisms on both sides have quasi-zero stiffness and can provide reaction force during the expansion and deformation of the battery cell assembly, thereby reducing the deformation and uneven stress of the battery cell assembly and improving the electrical performance and operational reliability of the battery device.

[0026] In some embodiments of this application, the support frame is provided with end plates on opposite sides along the first direction, and the end plates form the inner wall of the mounting cavity on the side facing the battery cell along the first direction. An elastic mechanism is provided between the end plates on both sides and the battery cell assembly.

[0027] By providing an end plate on each side of the battery cell assembly along the first direction, and clamping an elastic mechanism between the end plate and the battery cell assembly, a reaction force is provided to the battery cell assembly, while the end plate can also reduce the expansion and deformation of the battery cell assembly.

[0028] In some embodiments of this application, the elastic element includes a disc spring.

[0029] Disc springs can withstand extremely high loads in a small space. Compared with other types of springs, disc springs have a larger deformation energy per unit volume, which can reduce the space occupied in the support frame and thus reduce the size of the battery device.

[0030] In some embodiments of this application, the battery cell includes a packaging film and an electrode assembly, wherein the packaging film has an internal receiving space and the electrode assembly is disposed within the receiving space.

[0031] By placing the electrode assembly within the containment space formed by the packaging film, the energy density of the battery cell can be increased, and the weight can be reduced.

[0032] In some embodiments of this application, the battery cell has a first surface with the largest area, and a first direction is perpendicular to the first surface.

[0033] The first surface, which has the largest area, is more prone to deformation than other surfaces. By placing the elastic mechanism along the first direction on one side of the battery cell assembly, that is, by placing the elastic mechanism along the direction perpendicular to the first surface on one side of the battery cell assembly, the deformation of the battery cell assembly along the first direction can be reduced.

[0034] In some embodiments of this application, the battery device further includes a housing, and a support frame is disposed within the housing.

[0035] By placing the support frame inside the enclosure, the enclosure can protect the internal support frame and battery cell assembly, reducing the impact deformation of the battery cell assembly.

[0036] Secondly, this application proposes an electrical device that includes the battery device described above.

[0037] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0038] 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:

[0039] Figure 1 This is a structural schematic diagram of a vehicle provided in one embodiment of this application;

[0040] Figure 2 This is a schematic diagram of the structure of a battery device provided in one embodiment of this application;

[0041] Figure 3 This is a schematic diagram of the structure of a battery cell assembly provided in one embodiment of this application;

[0042] Figure 4 This is an exploded structural diagram of a battery cell provided in one embodiment of this application;

[0043] Figure 5 This is a schematic diagram of the structure of a battery device provided in one embodiment of this application;

[0044] Figure 6 for Figure 5 A schematic diagram of the elastic mechanism in the diagram;

[0045] Figure 7 for Figure 6A schematic diagram of the distribution structure of the first magnet on the first support plate.

[0046] The reference numerals in the detailed embodiments are as follows:

[0047] 1. Vehicles;

[0048] 10. Battery assembly; 11. Controller; 12. Motor;

[0049] 20. Battery cell assembly; 21. Battery cell; 211. End cap; 212. Housing; 2121. First surface; 213. Electrode assembly; 214. Electrode terminal; 22. Buffer pad;

[0050] 30. Box; 301. First box; 302. Second box;

[0051] 40. Support frame; 41. End plate; 42. Side plate;

[0052] 50. Elastic mechanism; 51. First magnet assembly; 511. First support plate; 512. First magnet; 5121. Permanent magnet; 52. Second magnet assembly; 521. Second support plate; 522. Second magnet; 53. Third magnet assembly; 531. Third support plate; 532. Third magnet; 54. Elastic element; 55. Support rod; 56. Abutment plate;

[0053] 60. Guide components;

[0054] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0055] 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.

[0056] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] In the assembly process of all-solid-state stacked pouch cells, buffer pads are typically added between the individual cells to achieve uniform stress distribution. However, the material properties of these buffer pads (such as creep relaxation) can cause the pressure between the 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.

[0063] To effectively 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 of this application, an elastic mechanism is installed within the support cavity, and through the cooperation of multiple magnets and elastic elements, the elastic mechanism achieves quasi-zero stiffness. The output force of the quasi-zero stiffness elastic mechanism does not change with the displacement of the elastic mechanism. That is, the displacement change generated when the battery cells in the battery cell assembly expand does not affect the reaction force of the elastic mechanism on the battery cell assembly. In other words, the reaction force of the quasi-zero stiffness elastic mechanism on the battery cell assembly is constant. Therefore, it can reduce the problem of uneven stress on individual battery cells and improve the electrical performance and operational reliability of the battery device.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0068] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] Figure 1 This is a structural schematic diagram 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] Combination Figure 5 and Figure 6 As shown, in some embodiments of this application, the battery device 10 includes a support frame 40, a battery cell assembly 20, and at least one elastic mechanism 50. The support frame 40 encloses and forms an installation cavity. The battery cell assembly 20 includes a plurality of battery cells 21 arranged sequentially in the installation cavity along a first direction X. Along the first direction, an elastic mechanism 50 is provided between at least one inner wall of the installation cavity and the battery cell assembly 20. The elastic mechanism 50 includes a plurality of magnet assemblies and at least one elastic element 54. At least one of the plurality of magnet assemblies is configured to move toward another magnet assembly under the action of the expansion force of the battery cell assembly 20, and provides negative stiffness to the elastic mechanism 50 through the interaction force between the plurality of magnet assemblies. The elastic element 54 is configured to be compressed and deformed under the action of the expansion force of the battery cell assembly 20, and provides positive stiffness to the elastic mechanism 50 through the deformed elastic element 54. The positive stiffness and negative stiffness are configured to match each other and provide quasi-zero stiffness to the elastic mechanism 50.

[0087] The plurality of magnet components include a first magnet component 51, a second magnet component 52, and a third magnet component 53, which are spaced apart along a first direction X. The first magnet component 51 includes a first magnet 512, the second magnet component 52 includes a second magnet 522, and the third magnet component 53 includes a third magnet 532. The first magnet 512 is located on the side of the second magnet 522 facing the battery cell assembly 20, and the third magnet 532 is located on the side of the second magnet 522 away from the battery cell assembly 20. The magnetic field directions of the first magnet 512, the second magnet 522, and the third magnet 532 are the same, and the magnetic field strengths are equal.

[0088] Specifically, the support frame 40 is a roughly frame-like structure, which can be formed by multiple plate-like structures, or by strip-like structures, such as steel strips, or by a combination of plate-like and strip-like structures. The battery cell assembly 20 is disposed within the mounting cavity formed by the support frame 40, and includes multiple battery cells 21 arranged along the first direction X. The multiple battery cells 21 can be connected in series or in parallel. Optionally, a buffer pad 22 can be provided between two adjacent battery cells 21.

[0089] The mounting cavity includes two inner walls arranged oppositely in the first direction X, with an elastic mechanism 50 provided between at least one inner wall and the battery cell assembly 20. The elastic mechanism 50 abuts against the inner walls of the battery cell assembly 20 and the support frame 40 at both ends along the first direction X, thereby reducing the expansion deformation of the battery cell assembly 20 along the first direction X. Simultaneously, the elastic mechanism 50 is configured to have quasi-zero stiffness, thus providing a constant reaction force to the battery cell assembly 20, thereby reducing uneven stress on the battery cells 21 and improving the electrical performance and operational reliability of the battery device 10. Optionally, the first direction X can be the length direction of the support frame 40.

[0090] The elastic mechanism 50 includes multiple magnet assemblies and at least one elastic element 54. Each magnet assembly includes at least a magnet; optionally, it may also include a support connected to the magnet to facilitate the installation and setup of the magnet. At least one of the multiple magnet assemblies is configured to move towards another magnet assembly under the expansion force of the battery cell assembly 20, providing negative stiffness to the elastic mechanism 50 through the interaction force between the multiple magnet assemblies. The elastic element 54 is configured to be compressed and deformed under the expansion force of the battery cell assembly 20, providing positive stiffness to the elastic mechanism 50 through the deformed elastic element 54. The positive and negative stiffnesses are configured to match each other, providing quasi-zero stiffness to the elastic mechanism 50.

[0091] The battery cell assembly 20 comprises a first magnet assembly 51, a second magnet assembly 52, and a third magnet assembly 53 spaced apart along a first direction X. The battery cell assembly 20, the first magnet assembly 51, the second magnet assembly 52, and the third magnet assembly 53 are arranged sequentially. The first magnet assembly 51 includes a first magnet 512, the second magnet assembly 52 includes a second magnet 522, and the third magnet assembly 53 includes a third magnet 532. The magnetic field directions of the first magnet 512, the second magnet 522, and the third magnet 532 are the same, and their magnetic field strengths are equal. Optionally, the magnetic field directions of the first magnet 512, the second magnet 522, and the third magnet 532 can be respectively arranged along the first direction X towards the battery cell assembly 20, or the magnetic field directions of the first magnet 512, the second magnet 522, and the third magnet 532 can be respectively arranged along the first direction X away from the battery cell assembly 20.

[0092] According to the battery device 10 of this application, the first magnet 512 and the third magnet 532 provide tensile force to the second magnet 522 in opposite directions. When the first magnet assembly 51, the second magnet assembly 52 and the third magnet assembly 53 are squeezed by the battery cell assembly 20, they can provide negative stiffness to the elastic mechanism 50. The elastic element 54 is configured to be squeezed and deformed under the expansion force of the battery cell assembly 20, and the deformed elastic element 54 provides positive stiffness to the elastic mechanism 50. Thus, the elastic mechanism 50 has quasi-zero stiffness through the cooperation of multiple magnets and elastic element 54. The output force of the quasi-zero stiffness elastic mechanism 50 does not change with the displacement of the elastic mechanism. That is, the displacement change generated when the battery cell 21 in the battery cell assembly 20 expands does not affect the reaction force of the elastic mechanism 50 on the battery cell assembly 20. In other words, the reaction force of the quasi-zero stiffness elastic mechanism 50 on the battery cell assembly 20 is a constant force. Therefore, it can reduce the problem of uneven force on the battery cell 21 and improve the electrical performance and operational reliability of the battery device 10.

[0093] Combination Figure 5 and Figure 6 As shown, in some embodiments of this application, the spacing between the first magnet assembly 51 and the third magnet assembly 53 is fixed along the first direction X, the second magnet assembly 52 is configured to move toward the third magnet assembly 53 under the expansion force of the battery cell assembly 20, and an elastic member 54 is sandwiched between the second magnet assembly 52 and the third magnet assembly 53.

[0094] Specifically, the first magnet assembly 51 and the third magnet assembly 53 are disposed within the mounting cavity formed by the support frame 40 and connected to the structure within the mounting cavity, thereby fixing the spacing between the first magnet assembly 51 and the third magnet assembly 53. The second magnet assembly 52 is disposed between the first magnet assembly 51 and the third magnet assembly 53 in a manner movable along the first direction X, and an elastic element 54 is sandwiched between the second and third magnet assemblies. When the battery cell 21 in the battery cell assembly 20 expands and deforms along the first direction X, it can compress the second magnet assembly 52 towards the third magnet assembly 53, and during this movement towards the third magnet assembly 53, it compresses the elastic element 54, thereby providing positive stiffness to the elastic mechanism 50 through the deformation of the elastic element 54. Optionally, the elastic element 54 can be a spring.

[0095] By fixing the spacing between the first magnet assembly 51 and the third magnet assembly 53, and allowing the second magnet assembly 52 to move toward the third magnet assembly 53 under the expansion force of the battery cell assembly 20, the second magnet assembly 52 and the third magnet assembly 53 together compress the elastic member 54 to deform, thereby providing positive stiffness to the elastic mechanism 50, while the first magnet assembly 51, the second magnet assembly 52 and the third magnet assembly 53 provide negative stiffness to the elastic mechanism 50.

[0096] Combination Figure 5 and Figure 6 As shown, in some embodiments of this application, the first magnet assembly 51 further includes a first support plate 511, the second magnet assembly 52 further includes a second support plate 521, and the third magnet assembly 53 further includes a third support plate 531. Along the first direction X, the first support plate 511, the second support plate 521, and the third support plate 531 are arranged sequentially and at intervals. The first magnet 512 is disposed on the side of the first support plate 511 away from the battery cell assembly 20, and the third magnet 532 is disposed on the side of the third support plate 531 facing the battery cell assembly 20. The second support plate 521 has a through opening, and the second magnet 522 is disposed in the opening of the second support plate 521. An elastic member 54 is sandwiched between the second support plate 521 and the third support plate 531.

[0097] Specifically, to facilitate the relative positioning of the first magnet 512, the second magnet 522, and the third magnet 532, the first magnet 512 is connected to the first support plate 511, the second magnet 522 is connected to the second support plate 521, and the third magnet 532 is connected to the third support plate 531. Optionally, the first support plate 511, the second support plate 521, and the third support plate 531 are all approximately flat structures with identical external dimensions, thus facilitating their arrangement within the support frame 40. The first support plate 511 and the third support plate 531 each have support surfaces on both sides along the first direction X. The first magnet 512 is attached to the support surface of the first support plate 511 facing the second support plate 521, and the third magnet 532 is attached to the support surface of the third support plate 531 facing the second support plate 521. The second support plate 521 has an opening at its center, and the second magnet 522 is located in the opening at the center of the second support plate 521, so that the magnetic field generated by the second magnet 522 directly acts on the first magnet 512 and the third magnet 532, reducing the obstruction of the magnetic field by the second support plate 521.

[0098] By setting up a first support plate 511, a second support plate 521, and a third support plate 531, and connecting the first magnet 512, the second magnet 522, and the third magnet 532 to the first support plate 511, the second support plate 521, and the third support plate 531 respectively, it is convenient to set the relative positions of the first magnet 512, the second magnet 522, and the third magnet 532, thereby providing negative stiffness to the elastic mechanism 50 through the combination of the first magnet 512, the second magnet 522, and the third magnet 532.

[0099] Combination Figure 5 and Figure 6 As shown, in some embodiments of this application, the elastic mechanism 50 further includes a support rod 55 and an abutment plate 56. The abutment plate 56 abuts against the battery cell assembly 20 along the first direction X. The two ends of the support rod 55 along the first direction X are respectively connected to the abutment plate 56 and the second support plate 521. The support rod 55 is inserted through the first support plate 511 in a manner that allows it to move along the first direction X.

[0100] Specifically, the abutment plate 56 is a generally flat structure and is arranged parallel to the first support plate 511, the second support plate 521, and the third support plate 531. The abutment plate 56 is located along the first direction X at the end of the elastic mechanism 50 facing the battery cell assembly 20 and abuts against the battery cell 21 or the buffer pad 22 of the battery cell assembly 20. Thus, when the battery cell 21 expands and deforms, the abutment plate 56 can compress the elastic mechanism 50, and the reaction force provided by the elastic mechanism 50 can reduce the expansion and deformation of the battery cell 21. The support rod 55 is a rod-shaped structure extending along the first direction X. The support rod 55 is inserted through the first support plate 511 in a manner that allows it to move along the first direction X, and the two axial ends of the support rod 55 are connected to the second support plate 521 and the abutment plate 56, respectively, such as by snap-fitting, bonding, or welding.

[0101] The second support plate 521 is connected to the abutment plate 56 via the support rod 55. When the battery cell assembly 20 expands and deforms, it can squeeze the abutment plate 56 and push the second support plate 521 toward the third magnet assembly 53 via the support rod 55. This increases the distance between the second magnet 522 and the first magnet 512 and decreases the distance between the second magnet 522 and the third magnet 532. Thus, the combination of the first magnet 512, the second magnet 522 and the third magnet 532 provides negative stiffness to the elastic mechanism 50.

[0102] Combination Figures 5 to 7 As shown, in some embodiments of this application, the first magnet 512, the second magnet 522 and the third magnet 532 respectively include a Heilbeck magnetic array.

[0103] Specifically, the Halbach Array is a special arrangement of permanent magnets that, through clever design of the spatial orientation of the magnets, can enhance the magnetic field on one side while almost canceling it out on the other, thus achieving an efficient and directional magnetic field distribution.

[0104] The Heilbeck magnetic array can generate a strong magnetic field within its effective range, and the magnetic field distribution is uniform with little magnetic leakage, thereby improving the stability of the relative movement of the first magnet assembly 51, the second magnet assembly 52 and the third magnet assembly 53.

[0105] Combination Figures 5 to 7 As shown, in some embodiments of this application, any one of the first magnet 512, the second magnet 522 and the third magnet 532 is provided with a plurality of Hellbeck magnetic arrays. The plurality of Hellbeck magnetic arrays in the same magnet are arranged side by side along a direction perpendicular to the first direction X. The magnetic field directions of any two Hellbeck magnetic arrays in the same magnet are the same and the magnetic field strengths are equal.

[0106] Specifically, such as Figure 7As shown, the first magnet 512 includes multiple Hellbeck magnetic arrays and is attached to one side of the first support plate 511. Along the second direction Y, there are four groups of Hellbeck magnetic arrays. Each group of Hellbeck magnetic arrays includes multiple permanent magnets 5121 arranged sequentially along the third direction Z. The magnetic field directions of adjacent groups of Hellbeck magnetic arrays are the same and the magnetic field strengths are equal (the black single arrow in the figure indicates the direction of the magnetic field). Within the same group, the magnetic field strengths of two adjacent permanent magnets 5121 are equal, and their magnetic field directions differ by 90°. Optionally, the second direction Y is perpendicular to the third direction Z, and the plane containing both the second direction Y and the third direction Z is perpendicular to the first direction X. Optionally, the second magnet 522 and the third magnet 532 also include multiple Hellbeck magnetic arrays, and the arrangement of these arrays is consistent with the arrangement of the Hellbeck magnetic arrays in the first magnet 512.

[0107] By arranging multiple Hellbeck magnetic arrays in the same magnet side by side in a direction perpendicular to the first direction X, and setting any two Hellbeck magnetic arrays in the same magnet to have the same magnetic field direction and equal magnetic field strength, the magnetic field strength of the elastic mechanism 50 can be effectively increased. This allows the negative stiffness provided by the first magnet 512, the second magnet 522, and the third magnet 532 to match the positive stiffness provided by the elastic element 54, and ultimately provides quasi-zero stiffness to the elastic mechanism 50.

[0108] Combination Figures 5 to 6 As shown, in some embodiments of this application, the battery device 10 further includes a guide 60, the battery cell assembly 20 is provided with the guide 60 on at least one side along a direction perpendicular to the first direction X, and the second magnet assembly 52 is connected to the guide 60 in a manner that allows it to slide along the first direction X.

[0109] Specifically, the guide member 60 is disposed on at least one side of the battery cell assembly 20 along the second direction Y, which is perpendicular to the first direction X. The guide member 60 can be a slide rail, and the second support plate 521 is provided with a sliding groove that cooperates with the slide rail, thereby improving the smoothness of the second magnet assembly 52's operation along the first direction X through the cooperation of the slide rail and the sliding groove. Optionally, the battery cell assembly 20 is provided with guide members 60 on both sides along the second direction Y. Optionally, the second direction Y can be the width direction of the support frame 40.

[0110] By connecting the second magnet assembly 52 to the guide member 60 in a manner that allows it to slide along the first direction X, the smoothness of the operation of the second magnet assembly 52 relative to the first magnet assembly 51 and the third magnet assembly 53 can be improved.

[0111] Combination Figures 5 to 6As shown, in some embodiments of this application, the first magnet assembly 51 and the third magnet assembly 53 are respectively connected to the support frame 40, and their positions relative to the support frame 40 are fixed.

[0112] Specifically, the support frame 40 includes two side plates 42 arranged opposite each other along the second direction Y, and the battery cell assembly 20 and the elastic mechanism 50 are respectively disposed between the two side plates 42. Optionally, the first magnet assembly 51 and the third magnet assembly 53 are respectively connected to the side plates 42, such as by bonding, welding or snapping.

[0113] By connecting the first magnet assembly 51 and the third magnet assembly 53 to the support frame 40 respectively, the relative positions of the first magnet assembly 51 and the third magnet assembly 53 are kept fixed, so that the positional relationship between the second magnet 522 and the first magnet 512 and the third magnet 532 can be adjusted by moving the second magnet assembly 52.

[0114] Combination Figures 5 to 6 As shown, in some embodiments of this application, there are two elastic mechanisms 50. Along the first direction X, an elastic mechanism 50 is provided between the inner walls of the opposite sides of the mounting cavity and the battery cell assembly 20.

[0115] Specifically, along the first direction X, elastic mechanisms 50 are provided on opposite sides of the battery cell assembly 20, and the elastic mechanisms 50 on both sides abut against the battery cell 21 and the inner wall of the mounting cavity, thereby providing a reaction force when the battery cell 21 expands and deforms along the first direction X.

[0116] By providing an elastic mechanism 50 on each side of the battery cell assembly 20 along the first direction X, the elastic mechanism 50 on both sides has quasi-zero stiffness and can provide reaction force in the expansion and deformation of the battery cell assembly 20, thereby reducing the deformation and uneven stress of the battery cell assembly 20 and improving the electrical performance and operational reliability of the battery device 10.

[0117] Combination Figures 5 to 6 As shown, in some embodiments of this application, the support frame 40 is provided with end plates 41 on opposite sides along the first direction X. The end plates 41 form the inner wall of the mounting cavity on the side facing the battery cell 21 along the first direction X. An elastic mechanism 50 is provided between the end plates 41 on both sides and the battery cell assembly 20.

[0118] Specifically, the support frame 40 includes two end plates 41 arranged opposite each other along the first direction X, and the end plates 41 have a certain supporting strength and deformation resistance. One end of the elastic mechanism 50 abuts against the battery cell assembly 20, and the other end of the elastic mechanism 50 abuts against the end plate 41. Optionally, the support frame 40 also includes two side plates 42 arranged opposite each other along the second direction Y, with the end plates 41 and side plates 42 alternately arranged and connected end to end to form the support frame 40.

[0119] By providing an end plate 41 on each side of the battery cell assembly 20 along the first direction X, and the elastic mechanism 50 being sandwiched between the end plate 41 and the battery cell assembly 20, a reaction force is provided for the battery cell assembly 20. At the same time, the end plate 41 can also reduce the expansion and deformation of the battery cell assembly 20.

[0120] Combination Figures 5 to 6 As shown, in some embodiments of this application, the elastic element 54 includes a disc spring.

[0121] Specifically, a disc spring, also known as a Bass spring, is a conical disc-shaped elastic element characterized by high load capacity, small deformation, and compact structure.

[0122] Disc springs can withstand large loads in a small space. Compared with other types of springs, disc springs have a larger deformation energy per unit volume, which can reduce the space occupied by the elastic element 54 in the support frame 40, thereby reducing the volume of the battery device 10.

[0123] Combination Figures 5 to 6 As shown, in some embodiments of this application, the battery cell 21 includes a packaging film and an electrode assembly, the packaging film having an internal receiving space, and the electrode assembly being disposed within the receiving space.

[0124] Specifically, the packaging film can be an aluminum-plastic composite film, which is made of multiple layers of polymer materials and aluminum foil. It has both flexibility and barrier properties. It is formed by hot pressing and has an internal space to accommodate the electrode components, which is commonly known as a soft-pack battery.

[0125] By placing the electrode assembly within the containment space formed by the packaging film, the energy density of the battery cell 21 can be increased, and the weight can be reduced.

[0126] Combination Figures 4 to 6 As shown, in some embodiments of this application, the battery cell 21 has a first surface 2121 with the largest area, and the first direction X is perpendicular to the first surface 2121.

[0127] Specifically, the battery cell 21 has multiple outer surfaces, among which the side surface with the largest area is the first surface 2121 of the battery cell 21.

[0128] The first surface 2121, which has the largest area, is more prone to deformation than other surfaces. By placing the elastic mechanism 50 along the first direction X on one side of the battery cell assembly 20, that is, by placing the elastic mechanism 50 along the direction perpendicular to the first surface 2121 on one side of the battery cell assembly 20, the deformation of the battery cell assembly 20 along the first direction X can be reduced.

[0129] Combination Figures 5 to 6 As shown, in some embodiments of this application, the battery device 10 further includes a housing 30, and a support frame 40 is disposed inside the housing 30.

[0130] Specifically, the support frame 40 and its internal battery cell assembly 20 and elastic mechanism 50 can together form a battery module, which is housed inside the housing 30. The housing 30 can contain multiple battery modules, which can be connected in series or in parallel to improve the power supply capacity of the battery device 10.

[0131] By placing the support frame 40 inside the housing 30, the housing 30 can provide protection for the internal support frame 40 and battery cell assembly 20, reducing the impact deformation of the battery cell assembly 20.

[0132] like Figure 1 As shown, a second aspect of this application provides an electrical device that includes the battery device 10 described above.

[0133] 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.

[0134] 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.

[0135] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0136] Combination Figures 4 to 7As shown, in some embodiments of the application, the battery device 10 includes a support frame 40, a battery cell assembly 20, and at least one elastic mechanism 50. The support frame 40 encloses a mounting cavity. The battery cell assembly 20 includes a plurality of battery cells 21 arranged sequentially in the mounting cavity along a first direction X. An elastic mechanism 50 is provided between at least one inner wall of the mounting cavity and the battery cell assembly 20 along the first direction X. The elastic mechanism 50 includes a plurality of magnet assemblies and at least one elastic element 54. At least one of the magnet assemblies is configured to move towards another magnet assembly under the expansion force of the battery cell assembly 20, and provides negative stiffness to the elastic mechanism 50 through the interaction force between the magnet assemblies. The elastic element 54 is configured to be compressed and deformed under the expansion force of the battery cell assembly 20, and provides positive stiffness to the elastic mechanism 50 through the deformed elastic element 54. The positive and negative stiffnesses are configured to match each other and provide quasi-zero stiffness to the elastic mechanism 50. The elastic element 54 includes a disc spring.

[0137] The plurality of magnet components include a first magnet component 51, a second magnet component 52, and a third magnet component 53, which are spaced apart along a first direction X. The first magnet component 51 includes a first magnet 512, the second magnet component 52 includes a second magnet 522, and the third magnet component 53 includes a third magnet 532. The first magnet 512 is located on the side of the second magnet 522 facing the battery cell assembly 20, and the third magnet 532 is located on the side of the second magnet 522 away from the battery cell assembly 20. The magnetic field directions of the first magnet 512, the second magnet 522, and the third magnet 532 are the same, and the magnetic field strengths are equal.

[0138] Along the first direction X, the spacing between the first magnet assembly 51 and the third magnet assembly 53 is fixed. The second magnet assembly 52 is configured to move toward the third magnet assembly 53 under the expansion force of the battery cell assembly 20. An elastic member 54 is sandwiched between the second magnet assembly 52 and the third magnet assembly 53.

[0139] The first magnet assembly 51 further includes a first support plate 511, the second magnet assembly 52 further includes a second support plate 521, and the third magnet assembly 53 further includes a third support plate 531. Along the first direction X, the first support plate 511, the second support plate 521, and the third support plate 531 are arranged sequentially and at intervals. The first magnet 512 is disposed on the side of the first support plate 511 away from the battery cell assembly 20, and the third magnet 532 is disposed on the side of the third support plate 531 facing the battery cell assembly 20. The second support plate 521 has a through opening, and the second magnet 522 is disposed in the opening of the second support plate 521. An elastic member 54 is sandwiched between the second support plate 521 and the third support plate 531.

[0140] The elastic mechanism 50 also includes a support rod 55 and an abutment plate 56. The abutment plate 56 abuts against the battery cell assembly 20 along the first direction X. The two ends of the support rod 55 along the first direction X are respectively connected to the abutment plate 56 and the second support plate 521. The support rod 55 is inserted through the first support plate 511 in a manner that allows it to move along the first direction X.

[0141] The first magnet 512, the second magnet 522, and the third magnet 532 each include a Hellbeck magnetic array. Each of the first magnet 512, the second magnet 522, and the third magnet 532 is provided with multiple Hellbeck magnetic arrays. The multiple Hellbeck magnetic arrays in the same magnet are arranged side by side along a direction perpendicular to the first direction X. The magnetic field directions of any two Hellbeck magnetic arrays in the same magnet are the same and the magnetic field strengths are equal.

[0142] The battery device 10 also includes a guide 60. The battery cell assembly 20 is provided with the guide 60 on at least one side along a direction perpendicular to the first direction X. The second magnet assembly 52 is connected to the guide 60 in a manner that allows it to slide along the first direction X.

[0143] The first magnet assembly 51 and the third magnet assembly 53 are respectively connected to the support frame 40, and their positions relative to the support frame 40 are fixed.

[0144] The system includes two elastic mechanisms 50. Along the first direction X, an elastic mechanism 50 is provided between the inner walls of the mounting cavity on opposite sides and the battery cell assembly 20. The support frame 40 has end plates 41 on opposite sides along the first direction X. The end plates 41 form the inner wall of the mounting cavity on the side facing the battery cell 21 along the first direction X, and an elastic mechanism 50 is provided between the end plates 41 on both sides and the battery cell assembly 20.

[0145] The battery cell 21 includes a packaging film and an electrode assembly. The packaging film has an internal receiving space, and the electrode assembly is disposed within the receiving space. The battery cell 21 has a first surface 2121 with the largest area, and a first direction X is perpendicular to the first surface 2121.

[0146] The battery device 10 also includes a housing 30, and a support frame 40 is disposed inside the housing 30.

[0147] 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: A support frame, wherein the support frame is configured to form an installation cavity; A battery cell assembly includes a plurality of battery cells arranged sequentially in the mounting cavity along a first direction; At least one elastic mechanism is provided along the first direction between the inner wall of at least one side of the mounting cavity and the battery cell assembly. The elastic mechanism includes a plurality of magnetic assemblies and at least one elastic element. At least one of the plurality of magnetic assemblies is configured to move toward another magnetic assembly under the expansion force of the battery cell assembly and provides negative stiffness to the elastic mechanism through the interaction force between the plurality of magnetic assemblies. The elastic element is configured to be compressed and deformed under the expansion force of the battery cell assembly and provides positive stiffness to the elastic mechanism through the deformed elastic element. The positive stiffness and the negative stiffness are configured to match each other and provide quasi-zero stiffness to the elastic mechanism. The plurality of magnet components include a first magnet component, a second magnet component, and a third magnet component spaced apart along the first direction. The spacing between the first magnet component and the third magnet component is fixed along the first direction. The second magnet component is configured to move toward the third magnet component under the expansion force of the battery cell component. The first magnet component includes a first magnet, the second magnet component includes a second magnet, and the third magnet component includes a third magnet. The first magnet is located on the side of the second magnet facing the battery cell component, and the third magnet is located on the side of the second magnet away from the battery cell component. The magnetic field directions of the first magnet, the second magnet, and the third magnet are the same, and the magnetic field strengths are equal. Each of the first magnet, the second magnet, and the third magnet is provided with a plurality of Hellbeck magnetic arrays. The plurality of Hellbeck magnetic arrays in the same magnet are arranged side by side along a direction perpendicular to the first direction. The magnetic field directions of any two Hellbeck magnetic arrays in the same magnet are the same, and the magnetic field strengths are equal. The battery device further includes a guide, and the battery cell assembly is provided with the guide on at least one side along a direction perpendicular to the first direction. The second magnet assembly is connected to the guide in a manner that allows it to slide along the first direction.

2. The battery device according to claim 1, characterized in that, The elastic element is sandwiched between the second magnet assembly and the third magnet assembly.

3. The battery device according to claim 2, characterized in that, The first magnet assembly further includes a first support plate, the second magnet assembly further includes a second support plate, and the third magnet assembly further includes a third support plate. Along the first direction, the first support plate, the second support plate, and the third support plate are arranged sequentially and at intervals. The first magnet is disposed on the side of the first support plate away from the battery cell assembly, and the third magnet is disposed on the side of the third support plate facing the battery cell assembly. The second support plate has a through opening, and the second magnet is disposed in the opening of the second support plate. The elastic member is sandwiched between the second support plate and the third support plate.

4. The battery device according to claim 3, characterized in that, The elastic mechanism further includes a support rod and an abutment plate. The abutment plate abuts against the battery cell assembly along the first direction. The two ends of the support rod along the first direction are respectively connected to the abutment plate and the second support plate. The support rod is inserted through the first support plate in a manner that allows it to move along the first direction.

5. The battery device according to claim 1, characterized in that, The first magnet assembly and the third magnet assembly are respectively connected to the support frame and their positions relative to the support frame are fixed.

6. The battery device according to any one of claims 1 to 5, characterized in that, The number of elastic mechanisms is two. Along the first direction, one of the elastic mechanisms is provided between the inner walls of the opposite sides of the mounting cavity and the battery cell assembly.

7. The battery device according to claim 6, characterized in that, The support frame is provided with end plates on opposite sides along the first direction. The side of the end plate facing the battery cell along the first direction forms the inner wall of the mounting cavity. An elastic mechanism is provided between the end plates on both sides and the battery cell assembly.

8. The battery device according to any one of claims 1 to 5, characterized in that, The elastic element includes a disc spring.

9. The battery device according to any one of claims 1 to 5, characterized in that, The battery cell includes a packaging film and an electrode assembly. The packaging film has an internal receiving space, and the electrode assembly is disposed within the receiving space.

10. The battery device according to any one of claims 1 to 5, characterized in that, The battery cell has a first surface with the largest area, and the first direction is perpendicular to the first surface.

11. The battery device according to any one of claims 1 to 5, characterized in that, The battery device also includes a housing, and the support frame is disposed inside the housing.

12. An electrical appliance, characterized in that, The electrical equipment includes the battery device according to any one of claims 1 to 11.

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