Battery device and electric equipment

Abstract

The invention belongs to the technical field of battery equipment, and particularly relates to a battery device and electric equipment. The battery device comprises a supporting frame, a battery monomer assembly and at least one elastic mechanism, a mounting cavity is defined by the supporting frame, the battery monomer assembly comprises a plurality of battery monomers which are sequentially arranged in the mounting cavity in the first direction, and the elastic mechanism is arranged between the inner wall of at least one side of the mounting cavity and the battery monomer assembly in the first direction; the elastic mechanism comprises a plurality of magnet assemblies and at least one elastic piece, at least one magnet assembly in the plurality of magnet assemblies is configured to move towards another magnet assembly under the action of the expansion force of the battery monomer assembly and provide negative stiffness, and the elastic piece is configured to be extruded to deform under the action of the expansion force of the battery monomer assembly and provide negative stiffness; the positive stiffness and the negative stiffness are configured to be capable of being matched with each other, and quasi-zero stiffness is provided for the elastic mechanism. The battery device provided by the invention can reduce the problem of non-uniform stress of the single batteries.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery devices, and particularly relates to a battery device and an electric equipment. BACKGROUND

[0002] In the grouping process of the full-solid-state laminated soft-pack battery system, a buffer pad is usually added between the battery monomers to achieve uniform stress. However, the material properties (such as creep relaxation) of the buffer pad can cause the pressure between the battery monomers to gradually decrease over time, thereby causing uneven stress. This uneven stress not only affects the cycle life and safety of the battery device, but can also have a significant impact on the electrochemical performance of the battery device. SUMMARY

[0003] In view of the defects of the prior art, the purpose of the application is to provide a battery device and an electric equipment which can effectively solve the problem of uneven stress of the battery monomers.

[0004] In a first aspect, the application provides a battery device, comprising: a support frame, the support frame surrounding a mounting cavity; a battery monomer assembly, comprising a plurality of battery monomers arranged in the mounting cavity in a first direction; at least one elastic mechanism, at least one side inner wall of the mounting cavity and the battery monomer assembly are provided with the elastic mechanism in 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 the swelling force of the battery monomer assembly, and the elastic mechanism is provided with negative stiffness through the interaction force between the plurality of magnet assemblies, the elastic piece is configured to be extruded and deformed under the action of the swelling force of the battery monomer assembly, and the elastic mechanism is provided with positive stiffness through the deformed elastic piece, wherein the positive stiffness and the negative stiffness are configured to be matched with each other, and the elastic mechanism is provided with quasi-zero stiffness; wherein the plurality of magnet assemblies comprise a first magnet assembly, a second magnet assembly and a third magnet assembly arranged at intervals in the first direction, the first magnet assembly comprises a first magnet, the second magnet assembly comprises a second magnet, and the third magnet assembly comprises a third magnet, the first magnet is arranged on a side of the second magnet facing the battery monomer assembly, the third magnet is arranged on a side of the second magnet away from the battery monomer assembly, and 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.

[0005] According to the battery device, the first magnet and the third magnet provide pulling forces in opposite directions to the second magnet, and when the first magnet assembly, the second magnet assembly and the third magnet assembly are collectively pressed by the battery cell assembly, the elastic mechanism is provided with negative stiffness, and the elastic member is configured to be pressed and deformed under the expansion force of the battery cell assembly and provide the elastic mechanism with positive stiffness through the deformed elastic member, so that the elastic mechanism has quasi-zero stiffness through the cooperation of the plurality of magnets and the elastic member, the output force of the elastic mechanism with quasi-zero stiffness does not change with the change of the displacement of the elastic mechanism, that is, the displacement change caused by the expansion of the battery cell in the battery cell assembly does not affect the reaction force of the elastic mechanism on the battery cell assembly, that is, the reaction force of the elastic mechanism with quasi-zero stiffness on the battery cell assembly is a constant force, thereby reducing the problem of uneven stress of the battery cell and improving the electrical performance and working reliability of the battery device.

[0006] In some embodiments of the present application, in the first direction, the spacing size between the first magnet assembly and the third magnet assembly is fixed, and the second magnet assembly is configured to move towards the third magnet assembly under the expansion force of the battery cell assembly, and the elastic member is clamped between the second magnet assembly and the third magnet assembly.

[0007] By fixing the spacing size between the first magnet assembly and the third magnet assembly, and enabling the second magnet assembly to move towards the third magnet assembly under the expansion force of the battery cell assembly, the second magnet assembly and the third magnet assembly collectively press and deform the elastic member in the process, thereby enabling the elastic member to provide the elastic mechanism with positive stiffness, and the first magnet assembly, the second magnet assembly and the third magnet assembly to provide the elastic mechanism with negative stiffness.

[0008] In some embodiments of the present application, the first magnet assembly further comprises a first support plate, the second magnet assembly further comprises a second support plate, and the third magnet assembly further comprises a third support plate, the first support plate, the second support plate and the third support plate are sequentially and spacedly arranged in the first direction, the first magnet is arranged on the side of the first support plate away from the battery cell assembly, the third magnet is arranged on the side of the third support plate facing the battery cell assembly, the second support plate is provided with an opening, the second magnet is arranged in the opening of the second support plate, and the elastic member is clamped between the second support plate and the third support plate.

[0009] By arranging the first support plate, the second support plate and the third support plate, and connecting the first magnet, the second magnet and the third magnet with the first support plate, the second support plate and the third support plate respectively, the relative positions of the first magnet, the second magnet and the third magnet are facilitated to be set, thereby providing the elastic mechanism with negative stiffness through the combination of the first magnet, the second magnet and the third magnet.

[0010] In some embodiments of the present application, the elastic mechanism further comprises a support rod and an abutting plate, the abutting plate abuts against the battery monomer assembly along the first direction, and the support rod is connected to the abutting plate and the second support plate at two ends thereof along the first direction, and the support rod is arranged through the first support plate in a manner capable of moving along the first direction.

[0011] The second support plate is connected to the abutting plate through the support rod, and when the battery monomer assembly is deformed by swelling, the abutting plate can be pressed, and the second support plate is pushed by the support rod to move towards the third magnet assembly, so as to increase the distance between the second magnet and the first magnet and decrease the distance between the second magnet and the third magnet, thereby providing negative stiffness for the elastic mechanism through the combination of the first magnet, the second magnet and the third magnet.

[0012] In some embodiments of the present application, the first magnet, the second magnet and the third magnet each comprise a Halbach magnetic array.

[0013] The Halbach magnetic array can generate a strong magnetic field within an effective stroke, and the magnetic field is uniformly distributed and has less magnetic leakage, thereby improving the stability during the relative movement of the first magnet assembly, the second magnet assembly and the third magnet assembly.

[0014] In some embodiments of the present application, any one of the first magnet, the second magnet and the third magnet is provided with a plurality of Halbach magnetic arrays, the plurality of Halbach magnetic arrays in the same magnet are arranged side by side along a direction perpendicular to the first direction, and any two Halbach magnetic arrays in the same magnet have the same magnetic field direction and equal magnetic field strength.

[0015] By arranging the plurality of Halbach magnetic arrays in the same magnet side by side along a direction perpendicular to the first direction, and arranging any two Halbach 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, so that the positive stiffness provided by the elastic member can be matched with the negative stiffness provided by the first magnet, the second magnet and the third magnet, and finally the quasi-zero stiffness is provided for the elastic mechanism.

[0016] In some embodiments of the present application, the battery device further comprises a guide, and the battery monomer assembly is provided with the guide at least on one side along a direction perpendicular to the first direction, and the second magnet assembly is connected to the guide in a manner capable of sliding along the first direction.

[0017] By connecting the second magnet assembly to the guide in a manner capable of sliding along the first direction, the stability of the second magnet assembly relative to the first magnet assembly and the third magnet assembly can be improved.

[0018] In some embodiments of the present application, the first magnet assembly and the third magnet assembly are connected to the support frame and fixed relative to the support frame.

[0019] The first magnet assembly and the third magnet assembly are connected to the support frame respectively, so that the relative positions of the first magnet assembly and the third magnet assembly are fixed, and the positional relationship between the second magnet and the first magnet and the third magnet is adjusted by movement of the second magnet.

[0020] In some embodiments of the present application, the number of elastic mechanisms is two, and one elastic mechanism is arranged between the battery monomer assembly and the inner wall of the mounting cavity on each side of the support frame along the first direction.

[0021] By arranging one elastic mechanism on each side of the battery monomer assembly along the first direction, the two elastic mechanisms have quasi-zero stiffness and can provide a counterforce in the swelling deformation of the battery monomer assembly, reduce the uneven deformation and stress of the battery monomer assembly, and improve the electrical performance and working reliability of the battery device.

[0022] In some embodiments of the present application, end plates are arranged on opposite sides of the support frame along the first direction, and the end plates form the inner walls of the mounting cavities on the side of the battery monomer along the first direction. One elastic mechanism is arranged between the battery monomer assembly and each end plate.

[0023] By arranging one end plate on each side of the battery monomer assembly along the first direction, the elastic mechanism is arranged between the end plate and the battery monomer assembly, thereby providing a counterforce for the battery monomer assembly, and the end plate can also reduce the swelling deformation of the battery monomer assembly.

[0024] In some embodiments of the present application, the elastic member includes a disc spring.

[0025] The disc spring can withstand a large load in a small space, and compared with other types of springs, the disc spring has a larger deformation energy per unit volume, thereby reducing the space occupied in the support frame and reducing the volume of the battery device.

[0026] In some embodiments of the present application, the battery monomer includes a packaging film and an electrode assembly, the packaging film has an accommodation space formed inside, and the electrode assembly is arranged in the accommodation space.

[0027] By arranging the electrode assembly in the accommodation space formed by the packaging film, the energy density of the battery monomer can be improved, and the weight is light.

[0028] In some embodiments of the present application, the battery monomer has a first surface with the largest area, and the first direction is perpendicular to the first surface.

[0029] The first surface with the largest area is more likely to be deformed than other surfaces. By arranging the elastic mechanism along a first direction on one side of the battery monomer assembly, i.e. arranging the elastic mechanism along a direction perpendicular to the first surface on one side of the battery monomer assembly, the deformation of the battery monomer assembly along the first direction can be reduced.

[0030] In some embodiments of the present application, the battery device further comprises a box, and the support frame is arranged in the box.

[0031] By arranging the support frame in the box, the support frame and the battery monomer assembly inside can be protected by the box, and the deformation of the battery monomer assembly under impact can be reduced.

[0032] In a second aspect, the present application provides a power consumption device, which comprises the battery device of any one of the above.

[0033] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the contents of the specification can be implemented, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included solely for purposes of illustrating the preferred embodiments and are not to be construed as a limitation of the present application. Moreover, the same reference numerals in the various drawings indicate the same or similar components. In the drawings: Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application; Figure 2 is a structural schematic diagram of a battery device provided by an embodiment of the present application; Figure 3 is a structural schematic diagram of a battery monomer assembly provided by an embodiment of the present application; Figure 4 is an exploded structural schematic diagram of a battery monomer provided by an embodiment of the present application; Figure 5 is a structural schematic diagram of a battery device provided by an embodiment of the present application; Figure 6 is a structural schematic diagram of an elastic mechanism in Figure 5 Figure 7 is a distribution structural schematic diagram of a first magnet on a first support plate in Figure 6

[0035] Reference numerals in the detailed description of the specific embodiments are as follows: 1, vehicle; ​​10, battery device; 11, controller; 12, motor; 20, battery cell assembly; 21, battery cell; 211, end cap; 212, case; 2121, first surface; 213, electrode assembly; 214, electrode terminal; 22, buffer pad; 30, box; 301, first box; 302, second box; 40, support frame; 41, end plate; 42, side plate; 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 member; 55, support rod; 56, abutting plate; 60, guide; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0036] The embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot be used to limit the protection scope of the present application.

[0037] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meanings understood by the skilled in the art to which the embodiments of the present application belong.

[0038] In the description of the embodiments of the present application, the orientations or positional relationships indicated by 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 the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0039] In addition, the technical terms "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0040] In the description of the embodiments of this application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on specific circumstances.

[0041] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] Currently, market developments indicate that power batteries are becoming increasingly widely used. Power batteries are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like 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 appliances.

[0043] During the assembly process of all-solid-state laminated soft-pack battery systems, cushioning pads are typically added between battery cells to ensure uniform stress distribution. However, the material properties of the cushioning pads (such as creep relaxation) cause the pressure between battery 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.

[0044] To effectively solve the problem of uneven force on the battery cells, the application provides a battery device and an electric device with the battery device. According to the battery device, an elastic mechanism is arranged in the supporting cavity, and the elastic mechanism has quasi-zero stiffness under the cooperation of the plurality of magnets and the elastic member. The output force of the elastic mechanism with quasi-zero stiffness does not change with the change of the displacement of the elastic mechanism. That is, the displacement change caused by the expansion of the battery cells in the battery cell assembly does not affect the reaction force of the elastic mechanism on the battery cell assembly. The reaction force of the elastic mechanism with quasi-zero stiffness on the battery cell assembly is a constant force, thereby reducing the problem of uneven force on the battery cells and improving the electrical performance and working reliability of the battery device.

[0045] The battery device mentioned in the embodiments of the application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0046] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells. For example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. For example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0047] In some embodiments, the battery device can be a battery pack including a box body and one or more battery cell assemblies accommodated in the box body.

[0048] For example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0049] For example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0050] For example, the box body can include a first box body and a second box body. The first box body and the second box body are buckled to form a closed space inside the box body to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first box body can be a top cover or a bottom plate.

[0051] For example, the box body can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected with the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0052] For example, the box body can be part of the chassis structure of the vehicle. For example, the top cover of the box body can be at least part of the floor of the vehicle, or the frame of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0053] In some embodiments, the battery device refers to an energy storage device, which includes a box with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0054] In some embodiments, an 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.

[0055] 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 at the appropriate time. For example, an energy storage device can store electrical energy during periods of low electricity consumption and provide it to relevant users or electrical equipment during periods of peak electricity consumption. The energy storage system provided in the embodiments of the present application can be any power system that requires an energy storage device.

[0056] The technical solutions described in the embodiments of the present application are applicable to various electrical devices and energy storage devices that use battery cells and battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships, spacecraft and energy storage containers, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0057] Figure 1 This is a schematic diagram of the structure of the vehicle 1 provided in some embodiments of the present application. Figure 1 As shown, vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. A battery device 10 is disposed within vehicle 1. Battery device 10 can be located at the bottom, front, or rear of vehicle 1. Battery device 10 can be used to power vehicle 1. For example, battery device 10 can serve as an operating power source for vehicle 1. Vehicle 1 can also include a controller 11 and a motor 12. Controller 11 is used to control battery device 10 to power motor 12, for example, to meet the power requirements of vehicle 1 during startup, navigation, and driving.

[0058] In some embodiments of the present application, the battery device 10 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0059] Figure 2 FIG. 1 is a schematic structural diagram of a battery device 10 according to an embodiment of the present application. Figure 3A schematic view of a battery cell assembly 20 according to an embodiment of the present application. As shown in Figure 2 and Figure 3 To meet different power requirements, the battery device 10 can include a plurality of battery cells 21, which are the smallest units that make up the battery device 10. The plurality of battery cells 21 can be connected in series and / or in parallel via electrode terminals to be applied to various application scenarios. Among them, the plurality of battery cells 21 can be connected in series or in parallel or in a hybrid manner, which means a mixture of series and parallel connection.

[0060] As shown in Figure 2 and Figure 3 The battery device 10 can include a plurality of battery cell assemblies 20 and a box 30, and the plurality of battery cell assemblies 20 are accommodated inside the box 30. The box 30 is used to accommodate the battery cells 21 or the battery cell assemblies 20 to reduce the influence of liquid or other foreign matters on the charging or discharging of the battery cells 21. The box 30 can be a simple solid structure such as a cuboid or a cylinder or a sphere, or a complex solid structure composed of a simple solid structure such as a cuboid or a cylinder or a sphere. The material of the box 30 can be an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin.

[0061] In some embodiments, the box 30 can include a first box 301 and a second box 302, and the first box 301 and the second box 302 are mutually coverable, and the first box 301 and the second box 302 together define a space for accommodating the battery cells 21. The second box 302 can be a hollow structure with one end open, and the first box 301 can be a plate-shaped structure, and the first box 301 is coverable on the open side of the second box 302 to make the first box 301 and the second box 302 together define the space for accommodating the battery cells 21; the first box 301 and the second box 302 can also be hollow structures with one side open, and the open side of the first box 301 is coverable on the open side of the second box 302.

[0062] The battery cell assembly 20 can include a plurality of battery cells 21, which can be connected in series or in parallel or in a hybrid manner to form the battery cell assembly 20, and a plurality of battery cell assemblies 20 can be connected in series or in parallel or in a hybrid manner to form the battery device 10. The battery cells 21 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, and the embodiments of the present application are not limited in this regard. The battery cells 21 are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft package battery cells, and the embodiments of the present application are not limited in this regard. However, for the sake of simplicity, the following embodiments will be described by taking the square lithium ion battery cells 21 as an example.

[0063] Figure 4 The figure is a schematic diagram of the exploded structure of the battery cell 21 provided in some embodiments of the present application. The battery cell 21 refers to the smallest unit that constitutes the battery device 10. Figure 4 The battery cell 21 includes an end cover 211 , a shell 212 and an electrode assembly 213 .

[0064] The end cap 211 refers to a component that covers the opening of the shell 212 to isolate the internal environment of the battery cell 21 from the external environment. Without limitation, the shape of the end cap 211 can be adapted to the shape of the shell 212 to match the shell 212. Optionally, the end cap 211 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 211 is less likely to deform when squeezed or collided, so that the battery cell 21 can have higher structural strength and improved safety performance. Functional components such as electrode terminals 214 can be provided on the end cap 211. The electrode terminal 214 can be used to electrically connect to the electrode assembly 213 for outputting or inputting electrical energy from the battery cell 21. In some embodiments, the end cap 211 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold. In some embodiments, an insulating member may be provided inside the end cap 211 to isolate the electrical connection components in the housing 212 from the end cap 211 to reduce the risk of short circuits. For example, the insulating member may be made of plastic, rubber, or the like.

[0065] The housing 212 is a component that cooperates 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), and other components. The housing 212 and the end cap 211 can be separate components. An opening can be provided in the housing 212, and the end cap 211 can be placed over 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 connection surface before other components are inserted into the housing. When the interior of the housing 212 is to be enclosed, the end cap 211 is placed over the housing 212. The housing 212 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, or a hexagonal prism. Specifically, the shape of the housing 212 can be determined based on the specific shape and size of the electrode assembly 213. The housing 212 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0066] The electrode assembly 213 is a component in the battery cell 21 where electrochemical reactions occur. One or more electrode assemblies 213 may be contained in the housing 212. The electrode assembly 213 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 213, and the parts of the positive and negative electrode sheets without active materials each constitute a tab (not shown in the figure). The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode terminals 214 to form a current loop.

[0067] Combine Figure 5 and Figure 6 As shown, in some embodiments of the present 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 is surrounded by a mounting cavity, the battery cell assembly 20 includes a plurality of battery cells 21 arranged in sequence in the mounting cavity along a first direction X, and an elastic mechanism 50 is provided between the inner wall of at least one side of the mounting cavity and the battery cell assembly 20 along the first direction, the elastic mechanism 50 includes a plurality of magnet assemblies and at least one elastic member 54, at least one magnet assembly 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 provide negative stiffness to the elastic mechanism 50 through the interaction force between the plurality of magnet assemblies, the elastic member 54 is configured to be squeezed and deformed under the action of the expansion force of the battery cell assembly 20, and provide positive stiffness to the elastic mechanism 50 through the deformed elastic member 54, wherein the positive stiffness and the negative stiffness are configured to match each other and provide quasi-zero stiffness to the elastic mechanism 50; Among them, multiple magnet assemblies include a first magnet assembly 51, a second magnet assembly 52 and a third magnet assembly 53 arranged at intervals along the first direction X, 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 first magnet 512 is arranged on the side of the second magnet 522 facing the battery cell assembly 20, and the third magnet 532 is arranged on the side of the second magnet 522 away from the battery cell assembly 20, and 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.

[0068] Specifically, the support frame 40 is a substantially frame-shaped structure, which can be formed by a plurality of plate-shaped structures, or can be formed by a plurality of strip-shaped structures such as steel strips, or can be formed by a combination of plate-shaped structures and strip-shaped structures. The battery cell assembly 20 is arranged in an installation cavity formed by the support frame 40, and includes a plurality of battery cells 21 arranged along the first direction X, which can be connected in series or in parallel with each other. Optionally, a buffer pad 22 can be arranged between two adjacent battery cells 21.

[0069] The installation cavity includes two inner walls arranged opposite to each other along the first direction X, and at least one of the inner walls is provided with an elastic mechanism 50 between the battery cell assembly 20 and the support frame 40. The elastic mechanism 50 is in abutment with the battery cell assembly 20 and the inner wall of 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. At the same time, the elastic mechanism 50 is configured to have quasi-zero stiffness, thereby providing a constant reaction force to the battery cell assembly 20, and further reducing the problem of uneven stress of the battery cell 21, and improving the electrical performance and working reliability of the battery device 10. Optionally, the first direction X can be the length direction of the support frame 40.

[0070] The elastic mechanism 50 includes a plurality of magnet assemblies and at least one elastic member 54, and the magnet assembly includes at least a magnet. Optionally, the magnet assembly can further include a support member connected to the magnet, thereby facilitating the arrangement and installation of the magnet. At least one of the plurality of magnet assemblies is configured to move towards another magnet assembly under the action of the expansion force of the battery cell assembly 20, and to provide negative stiffness to the elastic mechanism 50 through the interaction force between the plurality of magnet assemblies. The elastic member 54 is configured to be compressed and deformed under the action of the expansion force of the battery cell assembly 20, and to provide positive stiffness to the elastic mechanism 50 through the deformed elastic member 54, wherein the positive stiffness and the negative stiffness are configured to be matched with each other, and to provide quasi-zero stiffness to the elastic mechanism 50.

[0071] The plurality of magnet assemblies comprises a first magnet assembly 51, a second magnet assembly 52 and a third magnet assembly 53 arranged at intervals along the first direction X, and the battery cell assembly 20, the first magnet assembly 51, the second magnet assembly 52 and the third magnet assembly 53 are sequentially arranged in order. The first magnet assembly 51 comprises a first magnet 512, the second magnet assembly 52 comprises a second magnet 522, and the third magnet assembly 53 comprises 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 the magnetic field strengths are equal. Alternatively, the magnetic field directions of the first magnet 512, the second magnet 522 and the third magnet 532 can be arranged towards the battery cell assembly 20 along the first direction X respectively, or the magnetic field directions of the first magnet 512, the second magnet 522 and the third magnet 532 can be arranged away from the battery cell assembly 20 along the first direction X respectively.

[0072] According to the battery device 10 of the present application, the first magnet 512 and the third magnet 532 respectively provide a pulling force towards the second magnet 522 in opposite directions, and when the first magnet assembly 51, the second magnet assembly 52 and the third magnet assembly 53 are collectively pressed by the battery cell assembly 20, a negative stiffness can be provided for the elastic mechanism 50, while the elastic member 54 is configured to be deformed under the action of the expansion force of the battery cell assembly 20 and provide a positive stiffness for the elastic mechanism 50 through the deformed elastic member 54, so that the elastic mechanism 50 has quasi-zero stiffness under the cooperation of the plurality of magnets and the elastic member 54. The output force of the elastic mechanism 50 with quasi-zero stiffness does not change with the change of the displacement of the elastic mechanism, that is, the change of the displacement of the battery cell 21 in the battery cell assembly 20 does not affect the reaction force of the elastic mechanism 50 on the battery cell assembly 20, that is, the reaction force of the elastic mechanism 50 with quasi-zero stiffness on the battery cell assembly 20 is a constant force, thereby reducing the problem of uneven stress of the battery cell 21 and improving the electrical performance and working reliability of the battery device 10.

[0073] In combination with FIGS. 1-3, Figure 5 and Figure 6 As shown in FIGS. 1-3, in some embodiments of the present application, along the first direction X, the interval size between the first magnet assembly 51 and the third magnet assembly 53 is fixed, the second magnet assembly 52 is configured to move towards the third magnet assembly 53 under the action of the expansion force of the battery cell assembly 20, and the elastic member 54 is clamped between the second magnet assembly 52 and the third magnet assembly 53.

[0074] Specifically, the first magnet assembly 51 and the third magnet assembly 53 are arranged in the mounting cavity formed by the support frame 40 and connected with the structure in the mounting cavity, so that the interval between the first magnet assembly 51 and the third magnet assembly 53 is fixed. The second magnet assembly 52 is arranged between the first magnet assembly 51 and the third magnet assembly 53 in a manner capable of moving along the first direction X, and the elastic member 54 is arranged between the second magnet assembly 52 and the third magnet assembly 53. When the battery cell 21 in the battery cell assembly 20 expands and deforms along the first direction X, the second magnet assembly 52 can be pressed to move towards the third magnet assembly 53, and the elastic member 54 is pressed during the movement towards the third magnet assembly 53, so that the elastic member 54 provides the elastic mechanism 50 with positive stiffness through the deformation of the elastic member 54. Optionally, the elastic member 54 can be a spring.

[0075] By fixing the interval between the first magnet assembly 51 and the third magnet assembly 53, and enabling the second magnet assembly 52 to move towards the third magnet assembly 53 under the action of the expansion force of the battery cell assembly 20, the second magnet assembly 52 and the third magnet assembly 53 jointly press the elastic member 54 to deform during the movement, so that the elastic member 54 provides the elastic mechanism 50 with positive stiffness, and the first magnet assembly 51, the second magnet assembly 52 and the third magnet assembly 53 provide the elastic mechanism 50 with negative stiffness.

[0076] In combination with FIGS. 1 to 3, Figure 5 and Figure 6 In some embodiments of the present 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 in sequence and at intervals. The first magnet 512 is arranged on the side of the first support plate 511 away from the battery cell assembly 20. The third magnet 532 is arranged on the side of the third support plate 531 towards the battery cell assembly 20. The second support plate 521 is provided with an opening, the second magnet 522 is arranged in the opening of the second support plate 521, and the elastic member 54 is arranged between the second support plate 521 and the third support plate 531.

[0077] Specifically, to facilitate the setting of the relative positions of the first magnet 512, the second magnet 522 and the third magnet 532, the first magnet 512 is connected with the first support plate 511, the second magnet 522 is connected with the second support plate 521, and the third magnet 532 is connected with the third support plate 531. Optionally, the first support plate 511, the second support plate 521 and the third support plate 531 are respectively in a substantially flat plate structure and have consistent external dimensions, thereby facilitating the arrangement in the support frame 40. The first support plate 511 and the third support plate 531 are respectively provided with support surfaces on the two sides along the first direction X, the first magnet 512 is attached to the support surface on the side of the first support plate 511 facing the second support plate 521, and the third magnet 532 is attached to the support surface on the side of the third support plate 531 facing the second support plate 521. The second support plate 521 is provided with an opening in the center, and the second magnet 522 is arranged in the center opening 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 shielding of the magnetic field caused by the second support plate 521.

[0078] By arranging the first support plate 511, the second support plate 521 and the third support plate 531, and connecting the first magnet 512, the second magnet 522 and the third magnet 532 with the first support plate 511, the second support plate 521 and the third support plate 531 respectively, the relative positions of the first magnet 512, the second magnet 522 and the third magnet 532 can be set, thereby providing the elastic mechanism 50 with negative stiffness through the combination of the first magnet 512, the second magnet 522 and the third magnet 532.

[0079] In combination with Figure 5 and Figure 6 It is shown that in some embodiments of the present application, the elastic mechanism 50 further comprises a support rod 55 and an abutting plate 56, the abutting plate 56 abuts the battery monomer assembly 20 along the first direction X, the support rod 55 is connected with the abutting plate 56 and the second support plate 521 respectively at the two ends along the first direction X, and the support rod 55 is arranged in the first support plate 511 in a manner capable of moving along the first direction X.

[0080] Specifically, the abutment plate 56 is a substantially flat plate structure and is arranged in parallel with the first support plate 511, the second support plate 521, and the third support plate 531. The abutment plate 56 is arranged at the end of the elastic mechanism 50 facing the battery cell assembly 20 along the first direction X and abuts against the battery cell 21 or the buffer pad 22 of the battery cell assembly 20, so that when the battery cell 21 is deformed by swelling, the elastic mechanism 50 can be pressed by the abutment plate 56, and the swelling deformation of the battery cell 21 can be reduced by the reaction force provided by the elastic mechanism 50. The support rod 55 is a rod structure extending along the first direction X, and the support rod 55 is arranged in the first support plate 511 in a manner capable of moving along the first direction X, and the axial ends of the support rod 55 are connected to the second support plate 521 and the abutment plate 56, such as clamping, bonding, or welding.

[0081] The second support plate 521 is connected to the abutment plate 56 through the support rod 55, and when the battery cell assembly 20 is deformed by swelling, the abutment plate 56 can be pressed, and the second support plate 521 can be pushed by the support rod 55 to move towards the third magnet assembly 53, so as to increase the distance between the second magnet 522 and the first magnet 512 and reduce the distance between the second magnet 522 and the third magnet 532, thereby providing negative stiffness for the elastic mechanism 50 through the combination of the first magnet 512, the second magnet 522, and the third magnet 532.

[0082] In combination Figures 5 to 7 In some embodiments of the present application, the first magnet 512, the second magnet 522, and the third magnet 532 each include a Halbach magnetic array.

[0083] Specifically, the Halbach magnetic array is a special arrangement of permanent magnets, which can enhance the magnetic field on one side and almost cancel the magnetic field on the other side by cleverly designing the spatial orientation of the magnets, thereby achieving efficient and directional magnetic field distribution.

[0084] The Halbach magnetic array can generate a strong magnetic field within an effective stroke, and the magnetic field distribution is uniform and has less magnetic leakage, thereby improving the stability during the relative movement of the first magnet assembly 51, the second magnet assembly 52, and the third magnet assembly 53.

[0085] In combination Figures 5 to 7 In some embodiments of the present application, any one of the first magnet 512, the second magnet 522, and the third magnet 532 is provided with a plurality of Halbach magnetic arrays, and the plurality of Halbach magnetic arrays in the same magnet are arranged side by side along a direction perpendicular to the first direction X, and the magnetic field directions of any two Halbach magnetic arrays in the same magnet are the same and the magnetic field strengths are equal.

[0086] Specifically, as Figure 7As shown, the first magnet 512 includes a plurality of Halbach magnetic arrays and is attached to one side of the first support plate 511. Among them, along the second direction Y, the number of Halbach magnetic arrays is four groups, each group of Halbach magnetic arrays includes a plurality of permanent magnets 5121 arranged in the third direction Z in turn, and the magnetic field directions of adjacent two groups of Halbach magnetic arrays are the same and the magnetic field strengths are equal (the black single arrow line in the figure represents the direction of the magnetic field), and the magnetic field strengths of the adjacent two permanent magnets 5121 in the same group are equal and the magnetic field directions are different by 90°. Optionally, the second direction Y is perpendicular to the third direction Z, and the plane where the second direction Y and the third direction Z are located is perpendicular to the first direction X. Optionally, the second magnet 522 and the third magnet 532 also include a plurality of Halbach magnetic arrays, and the arrangement manner of the plurality of Halbach magnetic arrays is consistent with the arrangement manner of the plurality of Halbach magnetic arrays in the first magnet 512.

[0087] By arranging the plurality of Halbach magnetic arrays in the same magnet side by side along the direction perpendicular to the first direction X, and arranging any two Halbach 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 improved, so that the negative stiffness provided by the first magnet 512, the second magnet 522 and the third magnet 532 can match the positive stiffness provided by the elastic member 54, and finally provide the elastic mechanism 50 with quasi-zero stiffness.

[0088] In combination Figures 5 to 6 As shown, in some embodiments of the present application, the battery device 10 further includes a guide 60, and the battery monomer assembly 20 is provided with the guide 60 on at least one side in the direction perpendicular to the first direction X, and the second magnet assembly 52 is connected with the guide 60 in a manner capable of sliding along the first direction X.

[0089] Specifically, the guide 60 is arranged on at least one side of the battery monomer assembly 20 along the second direction Y, and the second direction Y is perpendicular to the first direction X. The guide 60 can be a sliding rail, and the second support plate 521 is provided with a sliding groove matched with the sliding rail, so as to improve the stability of the second magnet assembly 52 running along the first direction X through the cooperation of the sliding rail and the sliding groove. Optionally, the battery monomer assembly 20 is provided with the guide 60 on both sides along the second direction Y. Optionally, the second direction Y can be the width direction of the support frame 40.

[0090] By connecting the second magnet assembly 52 with the guide 60 in a manner capable of sliding along the first direction X, the stability of the second magnet assembly 52 running relative to the first magnet assembly 51 and the third magnet assembly 53 can be improved.

[0091] In combination Figures 5 to 6As shown, in some embodiments of the present application, the first magnet assembly 51 and the third magnet assembly 53 are connected to the support frame 40 and fixed relative to the support frame 40.

[0092] Specifically, the support frame 40 includes two side plates 42 arranged opposite along the second direction Y, and the battery monomer assembly 20 and the elastic mechanism 50 are arranged between the two side plates 42. Optionally, the first magnet assembly 51 and the third magnet assembly 53 are connected to the side plates 42, such as bonding, welding or clamping.

[0093] By connecting the first magnet assembly 51 and the third magnet assembly 53 to the support frame 40, the relative positions of the first magnet assembly 51 and the third magnet assembly 53 are fixed, so that the position relationship between the second magnet 522 and the first magnet 512 and the third magnet 532 is adjusted by the movement of the second magnet assembly 52.

[0094] In combination Figures 5 to 6 As shown, in some embodiments of the present application, the number of elastic mechanisms 50 is two, and one elastic mechanism 50 is arranged between the battery monomer assembly 20 and the inner wall of the mounting cavity on the opposite side of the mounting cavity along the first direction X.

[0095] Specifically, the opposite sides of the battery monomer assembly 20 along the first direction X are respectively provided with elastic mechanisms 50, and the elastic mechanisms 50 on the two sides are respectively in contact with the battery monomer 21 and the inner wall of the mounting cavity, so as to provide a reaction force when the battery monomer 21 expands and deforms along the first direction X.

[0096] By arranging one elastic mechanism 50 on the opposite sides of the battery monomer assembly 20 along the first direction X, the elastic mechanisms 50 on the two sides respectively have quasi-zero stiffness and can provide a reaction force in the expansion and deformation of the battery monomer assembly 20, reduce the uneven deformation and stress of the battery monomer assembly 20, and improve the electrical performance and working reliability of the battery device 10.

[0097] In combination Figures 5 to 6 As shown, in some embodiments of the present application, the support frame 40 is respectively provided with end plates 41 on the opposite sides along the first direction X, and the side of the end plate 41 facing the battery monomer 21 along the first direction X forms the inner wall of the mounting cavity. The two end plates 41 are respectively provided with one elastic mechanism 50 between the battery monomer assembly 20.

[0098] Specifically, the support frame 40 includes two end plates 41 oppositely arranged along the first direction X, and the end plates 41 have certain support strength and anti-deformation ability. One end of the elastic mechanism 50 abuts against the battery monomer assembly 20, and the other end of the elastic mechanism 50 abuts against the end plate 41. Optionally, the support frame 40 further includes two side plates 42 oppositely arranged along the second direction Y, and the end plates 41 and the side plates 42 are alternately arranged and connected end to end, thereby forming the support frame 40.

[0099] By arranging one end plate 41 on each side of the battery monomer assembly 20 along the first direction X, the elastic mechanism 50 is clamped between the end plate 41 and the battery monomer assembly 20, thereby providing a reaction force for the battery monomer assembly 20, and the end plate 41 can also reduce the swelling deformation of the battery monomer assembly 20.

[0100] In combination Figures 5 to 6 As shown in the drawings, in some embodiments of the present application, the elastic member 54 includes a disc spring.

[0101] Specifically, the disc spring, also known as Belleville spring, is a conical disc-shaped elastic element, which has the characteristics of high load capacity, small deformation, and compact structure.

[0102] The disc spring can withstand a large load in a small space. Compared with other types of springs, the disc spring has a larger deformation energy per unit volume, thereby reducing the space occupied by the elastic member 54 in the support frame 40, and further reducing the volume of the battery device 10.

[0103] In combination Figures 5 to 6 As shown in the drawings, in some embodiments of the present application, the battery monomer 21 includes a packaging film and an electrode assembly, and the packaging film has an accommodation space formed inside, and the electrode assembly is arranged in the accommodation space.

[0104] Specifically, the packaging film can be an aluminum-plastic composite film, which is composed of multiple layers of high molecular materials and aluminum foil, and has flexibility and barrier properties. The aluminum-plastic composite film is formed by hot pressing and has an accommodation space inside for accommodating the electrode assembly, which is commonly known as a soft-pack battery.

[0105] By arranging the electrode assembly in the accommodation space formed by the packaging film, the energy density of the battery monomer 21 can be improved, and the weight is light.

[0106] In combination Figures 4 to 6 As shown in the drawings, in some embodiments of the present application, the battery monomer 21 has a first surface 2121 with the largest area, and the first direction X is perpendicular to the first surface 2121.

[0107] Specifically, the battery monomer 21 has a plurality of outer surfaces, and the side surface with the largest area is the first surface 2121 of the battery monomer 21.

[0108] The first surface 2121 with the largest area is more likely to be deformed compared to other surfaces. By arranging the elastic mechanism 50 on one side of the battery monomer assembly 20 along the first direction X, i.e., arranging the elastic mechanism 50 on one side of the battery monomer assembly 20 along a direction perpendicular to the first surface 2121, the deformation of the battery monomer assembly 20 along the first direction X can be reduced.

[0109] In combination Figures 5 to 6 As shown in some embodiments of the present application, the battery device 10 further includes a box 30, and the support frame 40 is arranged in the box 30.

[0110] Specifically, the support frame 40, the battery monomer assembly 20 and the elastic mechanism 50 inside the support frame 40 can jointly form a battery module, and are jointly arranged inside the box 30. The number of battery modules in the box 30 can be multiple, and the multiple battery modules can be connected in series or parallel, thereby improving the power supply capacity of the battery device 10.

[0111] By arranging the support frame 40 in the box 30, the support frame 40 and the battery monomer assembly 20 inside the box 30 can be protected by the box 30, and the deformation of the battery monomer assembly 20 due to impact can be reduced.

[0112] As Figure 1 shown, the second aspect of the present application provides a power consumption device, and the power consumption device includes the battery device 10 of any one of the above.

[0113] Since the power consumption device in the present application has the same technical features as the battery device 10 of any one of the above embodiments, the same technical effects can be achieved, and here will not be repeated.

[0114] As Figure 1 shown, in some embodiments of the present application, the power consumption device can be a vehicle 1, and the vehicle 1 includes the battery device 10 of any one of the above embodiments, and the battery device 10 is used to provide electric energy for the vehicle 1 and to drive the vehicle 1 to walk.

[0115] The above description is only a summary of the technical scheme of the present application. In order to more clearly understand the technical means of the present application, the following specific embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described.

[0116] In combination Figures 4 to 7As shown, in some embodiments of the application, the battery device 10 comprises a support frame 40, a battery cell assembly 20 and at least one elastic mechanism 50, the support frame 40 is provided with a mounting cavity, the battery cell assembly 20 comprises a plurality of battery cells 21 arranged in the mounting cavity in sequence along a first direction X, at least one side inner wall of the mounting cavity is provided with the elastic mechanism 50 between the battery cell assembly 20 along the first direction X, the elastic mechanism 50 comprises a plurality of magnet assemblies and at least one elastic piece 54, at least one magnet assembly of the plurality of magnet assemblies is configured to move towards another magnet assembly under the action of the swelling force of the battery cell assembly 20, and the elastic mechanism 50 is provided with negative stiffness through the interaction force between the plurality of magnet assemblies, the elastic piece 54 is configured to be compressed and deformed under the action of the swelling force of the battery cell assembly 20, and the elastic mechanism 50 is provided with positive stiffness through the deformed elastic piece 54, wherein the positive stiffness and the negative stiffness are configured to be matched with each other and to provide the elastic mechanism 50 with quasi-zero stiffness. Wherein, the elastic piece 54 comprises a disc spring.

[0117] Wherein, the plurality of magnet assemblies comprises a first magnet assembly 51, a second magnet assembly 52 and a third magnet assembly 53 arranged at intervals along the first direction X, the first magnet assembly 51 comprises a first magnet 512, the second magnet assembly 52 comprises a second magnet 522, and the third magnet assembly 53 comprises a third magnet 532, the first magnet 512 is arranged on one side of the second magnet 522 facing the battery cell assembly 20, the third magnet 532 is arranged on one side of the second magnet 522 away from the battery cell assembly 20, and 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.

[0118] Wherein, along the first direction X, the interval size between the first magnet assembly 51 and the third magnet assembly 53 is fixed, the second magnet assembly 52 is configured to move towards the third magnet assembly 53 under the action of the swelling force of the battery cell assembly 20, and the elastic piece 54 is clamped between the second magnet assembly 52 and the third magnet assembly 53.

[0119] Wherein, the first magnet assembly 51 further comprises a first support plate 511, the second magnet assembly 52 further comprises a second support plate 521, and the third magnet assembly 53 further comprises a third support plate 531, the first support plate 511, the second support plate 521 and the third support plate 531 are arranged in sequence and at intervals along the first direction X, the first magnet 512 is arranged on one side of the first support plate 511 away from the battery cell assembly 20, the third magnet 532 is arranged on one side of the third support plate 531 facing the battery cell assembly 20, the second support plate 521 is provided with an opening, the second magnet 522 is arranged in the opening of the second support plate 521, and the elastic piece 54 is clamped between the second support plate 521 and the third support plate 531.

[0120] The elastic mechanism 50 further comprises a support rod 55 and an abutting plate 56, the abutting plate 56 abuts against the battery monomer assembly 20 along the first direction X, and the support rod 55 is connected to the abutting plate 56 and the second support plate 521 at two ends thereof along the first direction X, and the support rod 55 is arranged through the first support plate 511 in a manner capable of moving along the first direction X.

[0121] The first magnet 512, the second magnet 522 and the third magnet 532 each comprise a Halbach magnetic array. Any one of the first magnet 512, the second magnet 522 and the third magnet 532 is provided with a plurality of Halbach magnetic arrays, the plurality of Halbach magnetic arrays in the same magnet are arranged side by side along a direction perpendicular to the first direction X, and the magnetic field directions of any two Halbach magnetic arrays in the same magnet are the same and the magnetic field strengths thereof are equal.

[0122] The battery device 10 further comprises a guide 60, the battery monomer assembly 20 is provided with the guide 60 on at least one side thereof along a direction perpendicular to the first direction X, and the second magnet assembly 52 is connected to the guide 60 in a manner capable of sliding along the first direction X.

[0123] The first magnet assembly 51 and the third magnet assembly 53 are connected to the support frame 40 and fixed relative to the support frame 40.

[0124] The number of the elastic mechanisms 50 is two, and the battery monomer assembly 20 is provided with one elastic mechanism 50 between the battery monomer assembly 20 and each of the two sides of the installation cavity. The support frame 40 is provided with an end plate 41 on each of the opposite sides thereof along the first direction X, and the end plate 41 on each side forms an inner wall of the installation cavity on the side thereof facing the battery monomer 21 along the first direction X. The battery monomer assembly 20 is provided with one elastic mechanism 50 between the battery monomer assembly 20 and each of the two end plates 41.

[0125] The battery monomer 21 comprises a packaging film and an electrode assembly, the inside of the packaging film forms an accommodation space, and the electrode assembly is arranged in the accommodation space. The battery monomer 21 has a first surface 2121 with the largest area, and the first direction X is perpendicular to the first surface 2121.

[0126] The battery device 10 further comprises a box 30, and the support frame 40 is arranged in the box 30.

[0127] It should be noted that the above-mentioned embodiments are only used to explain the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still make modifications to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present 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 supporting frame, wherein the supporting frame is surrounded by a mounting cavity; A battery cell assembly, comprising a plurality of battery cells sequentially arranged in the mounting cavity along a first direction; At least one elastic mechanism is provided between an inner wall of at least one side of the mounting cavity and the battery cell assembly along the first direction, the elastic mechanism comprising a plurality of magnet assemblies and at least one elastic member, at least one of the plurality of magnet assemblies being configured to move toward another magnet assembly under the action of an expansion force of the battery cell assembly, and providing negative stiffness to the elastic mechanism through interaction forces between the plurality of magnet assemblies, the elastic member being configured to be squeezed and deformed under the action of the expansion force of the battery cell assembly, and providing positive stiffness to the elastic mechanism through the deformed elastic member, wherein the positive stiffness and the negative stiffness are configured to match each other and provide quasi-zero stiffness to the elastic mechanism; Among them, the multiple magnet assemblies include a first magnet assembly, a second magnet assembly and a third magnet assembly arranged at intervals along the first direction, the first magnet assembly includes a first magnet, the second magnet assembly includes a second magnet, and the third magnet assembly includes a third magnet. The first magnet is arranged on the side of the second magnet facing the battery cell assembly, and the third magnet is arranged on the side of the second magnet facing away from the battery cell assembly, and 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.

2. The battery device according to claim 1, wherein: Along the first direction, the spacing between the first magnet assembly and the third magnet assembly is fixed, the second magnet assembly is configured to move toward the third magnet assembly under the action of the expansion force of the battery cell assembly, and the elastic member 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 also includes a first support plate, the second magnet assembly also includes a second support plate, and the third magnet assembly also includes a third support plate. Along the first direction, the first support plate, the second support plate and the third support plate are arranged in sequence and at intervals. The first magnet is arranged on the side of the first support plate away from the battery cell assembly, and the third magnet is arranged on the side of the third support plate facing the battery cell assembly. The second support plate is provided with an opening, and the second magnet is arranged 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 also 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, and the support rod is inserted into the first support plate in a manner that can move along the first direction.

5. The battery device according to claim 3, wherein: The first magnet, the second magnet, and the third magnet each include a Halbach magnetic array.

6. The battery device according to claim 5, characterized in that Any one of the first magnet, the second magnet and the third magnet is respectively provided with a plurality of the Halbach magnetic arrays, and the plurality of the Halbach magnetic arrays in the same magnet are arranged side by side in a direction perpendicular to the first direction, and the magnetic field directions and magnetic field strengths of any two of the Halbach magnetic arrays in the same magnet are the same.

7. The battery device according to claim 2, characterized in that The battery device further includes a guide member, and the guide member is provided on at least one side of the battery cell assembly in a direction perpendicular to the first direction. The second magnet assembly is connected to the guide member in a manner that allows it to slide along the first direction.

8. The battery device according to claim 2, wherein: The first magnet assembly and the third magnet assembly are respectively connected to the support frame and are fixed in position relative to the support frame.

9. The battery device according to any one of claims 1 to 8, characterized in that There are two elastic mechanisms. Along the first direction, one elastic mechanism is provided between the battery cell assembly and two inner walls of the mounting cavity that are opposite to each other.

10. The battery device according to claim 9, characterized in that The support frame is provided with end plates on opposite sides along the first direction. The end plates form the inner wall of the installation 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.

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

12. The battery device according to any one of claims 1 to 8, characterized in that The battery cell includes a packaging film and an electrode assembly. A receiving space is formed inside the packaging film, and the electrode assembly is disposed in the receiving space.

13. The battery device according to any one of claims 1 to 8, characterized in that The battery cell has a first surface with the largest area, and the first direction is perpendicular to the first surface.

14. The battery device according to any one of claims 1 to 8, characterized in that The battery device further includes a box body, and the support frame is arranged in the box body.

15. An electrical device, characterized in that: The electric device comprises the battery device according to any one of claims 1 to 14.

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