Battery device and electric device

Abstract

The invention relates to a battery device and a power utilization device. The battery device comprises a plurality of stacked battery cells; and at least one group of elastic components, wherein the battery monomer on the outermost side in the plurality of battery monomers is abutted against and matched with the elastic components. Each elastic assembly comprises at least two disc springs, and the height-thickness ratio of at least one disc spring is larger than that of other disc springs. The compression stroke of the disc spring is h0, the plate thickness of the disc spring is t, and the height-thickness ratio of the disc spring is defined as h0 / t; in each group of elastic components, at least one disc spring is configured as follows: along with the increase of the compression amount of the disc spring, the acting force value provided by the disc spring firstly rises and then falls; the at least one disc spring is configured in the mode that the value of the acting force provided by the disc spring is increased along with the increase of the compression amount of the disc spring. The battery device and the power utilization device provided by the embodiment of the invention have the advantage of stable performance.

Description

Technical Field

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

[0002] Existing battery devices typically require a certain amount of external pressure to be applied during the charge and discharge process, and the force must be maintained within a certain range. However, during the charge and discharge process, the positive and negative electrode materials undergo expansion and contraction, and the external pressure on the battery cells fluctuates significantly, affecting the performance of the battery device. Summary of the Invention

[0003] Based on this, it is necessary to provide a battery device and an electrical device to address the problem of unstable performance of the battery device.

[0004] A first aspect of an embodiment of the present application provides a battery device, including:

[0005] multiple stacked battery cells;

[0006] and at least one set of elastic components, wherein the outermost battery cells among the plurality of battery cells are in abutment with the elastic components;

[0007] Each group of the elastic components includes at least two disc springs, and at least one disc spring has a height-to-thickness ratio greater than that of the other disc springs;

[0008] The compression stroke of the disc spring is h0, the plate thickness of the disc spring is t, and the height-to-thickness ratio of the disc spring is defined as h0 / t;

[0009] In each group of the elastic components, at least one disc spring is configured so that as the compression of the disc spring increases, the force value provided by the disc spring first increases and then decreases; at least one disc spring is configured so that as the compression of the disc spring increases, the force value provided by the disc spring increases.

[0010] By arranging each group of elastic components to include at least two disc springs, at least one disc spring has a height-to-thickness ratio greater than that of the other disc springs; the elastic component formed by the disc spring combination has a wider zero-stiffness characteristic, that is, the resultant force output by the elastic component can be constant within a certain compression range, and when the battery cell expands or contracts, the compression amount of the elastic component can increase or decrease accordingly, and the compression amount of the disc springs with different height-to-thickness ratios changes accordingly. After combining each other, it is ensured that the actual force provided by the elastic component to the battery cell changes little and tends to be constant; furthermore, when the elastic component reaches a certain compression range, as the compression amount continues to increase, the sum of the forces of the various disc springs changes little and tends to be constant, thereby making the elastic component formed by the disc spring combination have a wider zero-stiffness characteristic, that is, the resultant force output by the elastic component can be constant within a certain compression range; in this way, the battery cell can be placed under a suitable and constant external pressure, and the electrical performance of the battery device can be ensured to be stable.

[0011] In one embodiment, in each group of the elastic components, at least one disc spring has a height-to-thickness ratio greater than 1.4; and at least one disc spring has a height-to-thickness ratio less than 1.4. By setting the height-to-thickness ratio of at least one disc spring in each group of the elastic components to be greater than 1.4; and at least one disc spring has a height-to-thickness ratio less than 1.4; when the elastic component is within a certain compression range, as the compression amount continues to increase, the actual force provided to the outside by the disc springs with a height-to-thickness ratio less than 1.4 continues to increase, while the actual force provided to the outside by the disc springs with a height-to-thickness ratio greater than 1.4 continues to decrease, and the sum of the forces of the individual disc springs changes little and tends to remain constant, thereby making the elastic component formed by the combination of disc springs have a wider range of zero-stiffness characteristics, that is, the resultant force output by the elastic component within a certain compression range can be constant; ultimately, the battery cell can be placed under appropriate and constant external pressure, and the stable electrical performance of the battery device can be ensured.

[0012] In one embodiment, when the compression of the elastic component is within the target compression range, the force provided by at least one disc spring with a relatively high height-to-thickness ratio in the elastic component increases as the compression increases; the force provided by at least one disc spring with a relatively low height-to-thickness ratio decreases as the compression increases, so that the resultant force output by the elastic component is constant; the target compression range is defined as 0.5*h0~1.1*h0. In this way, when the ratio of compression to compression stroke is greater than 0.5, the compression of the elastic component is within the target compression range. As the compression continues to increase, the sum of the forces of the individual disc springs changes slightly and tends to remain constant, thereby allowing the elastic component formed by the disc spring combination to have a wider range of zero-stiffness characteristics, that is, the resultant force output by the elastic component within the target compression range can be constant; this can place the battery cell under appropriate and constant external pressure and ensure the stable electrical performance of the battery device.

[0013] In one embodiment, the target compression range is defined as 0.7*h0~0.9*h0.

[0014] In one embodiment, in each set of the elastic components, one disc spring has a height-to-thickness ratio of 1.7, while the other disc spring has a height-to-thickness ratio of 1.3. By setting the height-to-thickness ratio of one disc spring to 1.7 and the other disc spring to 1.3 in each set of the elastic components, the battery cells can be placed under appropriate and constant external pressure, ensuring stable electrical performance of the battery device.

[0015] In one embodiment, in each group of the elastic components, the height-to-thickness ratio of one of the disc springs is 1.8, and the height-to-thickness ratio of another disc spring is 1.1.

[0016] In one embodiment, each group of the elastic components includes three disc springs, one of the disc springs has a height-to-thickness ratio of 2, one of the disc springs has a height-to-thickness ratio of 1.2, and another of the disc springs has a height-to-thickness ratio of 1.1.

[0017] In one embodiment, the height-to-thickness ratio of the disc spring satisfies: 1.0≤h0 / t≤2.2.

[0018] In one embodiment, the battery device includes a first end plate; the first end plate is disposed outside the outermost battery cell among the plurality of battery cells; the elastic component elastically abuts the first end plate. In this manner, the first end plate can effectively and evenly distribute the force applied by the disc springs, preventing the battery cells from being crushed; the elastic component can constrain the movement and deformation of the battery cells in a first direction; and ensure that the actual force applied by the elastic component to the battery cells varies minimally and tends to remain constant. Furthermore, the elastic component composed of the disc springs can provide relatively constant pressure compensation to the battery cells 121. Ultimately, the battery cells can be subjected to a suitable and constant external pressure, ensuring the stable electrical performance of the battery device.

[0019] In one embodiment, the battery device further includes a second end plate, which is located on a side of the elastic assembly away from the first end plate, with the elastic assembly sandwiched between the second end plate and the first end plate. This allows the second end plate to effectively and evenly distribute the force applied by the disc springs, preventing them from being crushed.

[0020] In one embodiment, in each group of the elastic components, the disc springs with a relatively high height-to-thickness ratio and the disc springs with a relatively low height-to-thickness ratio are arranged alternately in sequence.

[0021] In one embodiment, each of the disc springs includes a bell mouth located at the end with a larger outer diameter; in the elastic component, the bell mouth of the disc spring with a relatively high height-to-thickness ratio and the bell mouth of the disc spring with a relatively low height-to-thickness ratio face the battery cell.

[0022] A second aspect of the embodiments of the present application provides an electrical device including the above-mentioned battery device.

[0023] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a vehicle provided for some embodiments of the present application.

[0025] Figure 2 Schematic diagram of the exploded structure of the battery device provided in some embodiments of the present application.

[0026] Figure 3 A schematic structural diagram of the battery module provided in some embodiments of the present application.

[0027] Figure 4 Schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0028] Figure 5 This is a schematic diagram of the exploded structure of the battery device provided in some embodiments of the present application, in which the box is omitted.

[0029] Figure 6 A schematic structural diagram of a battery device provided in some embodiments of the present application.

[0030] Figure 7 Schematic diagram of the cooperation between the elastic component and the second end plate provided in some embodiments of the present application.

[0031] Figure 8 Schematic diagram of the structure of the disc spring provided in some embodiments of the present application.

[0032] Figure 9 Schematic diagram of local parameters of disc springs provided for some embodiments of the present application.

[0033] Figure 10 A diagram showing the relationship between compression curves of disc springs at different height-to-thickness ratios provided in some embodiments of the present application, wherein the horizontal axis represents the ratio of compression amount to compression stroke, and the vertical axis represents the ratio of actual force to maximum force.

[0034] Figure 11 A compression curve relationship diagram of the elastic component provided in some embodiments of the present application.

[0035] Figure 12 Compression curve relationship diagram of elastic components provided in other embodiments of the present application.

[0036] Figure 13 This is a compression curve relationship diagram of the elastic component provided in some further embodiments of the present application.

[0037] Description of reference numerals:

[0038] Vehicles - 1000;

[0039] Battery device 100, housing 110, first portion 111, second portion 112, battery module 120, battery cell 121, end cap 122, housing 123, electrode assembly 124, electrode terminal 125, controller 200, motor 300;

[0040] Elastic component-400, disc spring-410, bell mouth-411, center hole-412, first end plate-500, expansion beam-600, second end plate-700, positioning part-710. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0043] In the description of the embodiments of the present application, if the technical terms "first" and "second" appear, these terms are only used for descriptive purposes to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0044] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0045] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0046] In the description of the embodiments of this application, if the term "plurality" appears, "plurality" means at least two (including two), for example, two, three, etc., unless otherwise specifically defined. Similarly, if the term "multiple groups" appears, "multiple groups" means two or more groups (including two), and if the term "multiple sheets" appears, "multiple sheets" means two or more sheets (including two).

[0047] In the description of the embodiments of the present application, if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, if technical terms such as "installed", "connected", "connected", and "fixed" appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this 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, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0050] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0051] Currently, market developments indicate that battery applications are becoming increasingly widespread. They 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 aerospace and other fields. As battery applications continue to expand, market demand is also growing.

[0052] In related technologies, since all-solid-state battery devices lack electrolytes, a certain amount of external pressure must be applied to the all-solid-state battery device to ensure better contact between particles within the all-solid-state battery device to transfer electrons and ions. However, during the charge and discharge process of the all-solid-state battery cell, the battery cell itself inevitably undergoes volume deformation, and the external pressure will also change due to the change in the volume of the all-solid-state battery device, causing the contact relationship between particles to change accordingly, which in turn affects the electrical performance of the battery cell.

[0053] To improve the problem of unstable battery device performance, at least two disc springs can be designed, with at least one disc spring having a greater height-to-thickness ratio than the other disc springs. This allows the elastic assembly formed by the disc springs to have a wider range of zero-stiffness characteristics, meaning that the combined force output by the elastic assembly can be constant within a certain compression range. When the battery cell expands or contracts, the compression of the elastic assembly can increase or decrease accordingly, and the compression of disc springs with different height-to-thickness ratios changes accordingly. When combined, this ensures that the actual force applied by the elastic assembly to the battery cell changes little and tends to remain constant. Furthermore, the elastic assembly composed of disc springs can provide relatively constant pressure compensation to the battery cell. Ultimately, the battery cell can be placed under appropriate and constant external pressure, ensuring the stable electrical performance of the battery device.

[0054] The embodiments of the present application provide a battery device and an electrical device. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, an energy storage product, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc. The energy storage product may include an energy storage station, etc.

[0055] It should be understood that the technical solutions generally described in the embodiments of the present application are not limited to the battery devices and electrical devices described above, but can also be applied to all battery devices including a box and electrical devices using the battery devices. However, for the sake of simplicity of description, an electrical device in an embodiment of the present application is taken as an example of vehicle 1000.

[0056] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

[0057] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0058] Figure 2 An exploded view of a battery device 100 provided in some embodiments of the present application; Figure 3 This is a schematic diagram of the structure of the battery module provided in some embodiments of the present application. Figure 2 and Figure 3 To meet different power requirements, the battery device 100 may include multiple battery cells 121 and a housing 110. A battery cell 121 is the smallest unit that makes up a battery module 120 or a battery pack. Multiple battery cells 121 can be connected in series and / or in parallel via electrode terminals for various applications. The battery device 100 referred to in this application is a battery pack.

[0059] The box 110 is used to accommodate the battery cells 121 or the battery modules 120 to prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells 121 .

[0060] The housing 110 can have various structures. In some embodiments, the housing 110 can include a first portion 111 and a second portion 112. The first portion 111 and the second portion 112 overlap each other, and together define a storage space for accommodating the battery cells 121. The second portion 112 can be a hollow structure with one end open, and the first portion 111 can be a plate-like structure. The first portion 111 overlaps the open side of the second portion 112, so that the first portion 111 and the second portion 112 together define the storage space. The first portion 111 and the second portion 112 can also be hollow structures with one end open, with the open side of the first portion 111 overlapping the open side of the second portion 112. Of course, the housing 110 formed by the first portion 111 and the second portion 112 can have various shapes, such as a simple three-dimensional structure such as a single rectangular parallelepiped, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as rectangular parallelepipeds, cylinders, or spheres. This is not limited in the present embodiments. The material of the box body 110 can be an alloy material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin, and the embodiment of the present application is not limited to this.

[0061] In the embodiments of the present application, multiple battery cells 121 can be directly assembled into a battery device pack, or they can be first assembled into a battery module 120, which can then be assembled into a battery device pack. Specifically, multiple battery cells 121 can be directly connected in series, parallel, or in a hybrid manner to form a whole, which can then be housed within the housing 110. Alternatively, multiple battery cells 121 can be first connected in series, parallel, or in a hybrid manner to form a battery module 120, which can then be assembled into a whole, which can then be housed within the housing 110.

[0062] The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component for achieving electrical connection between the plurality of battery cells 121 .

[0063] Each battery cell 121 can be a secondary battery device or a primary battery device; it can also be a lithium-sulfur battery device, a sodium-ion battery device or a magnesium-ion battery device, but is not limited thereto. Each battery cell 121 can also be an all-solid-state battery device. The battery cell 121 can be cylindrical, flat, rectangular or other shapes. The battery cells 121 are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application are not limited to this. However, for the sake of simplicity, the following embodiments are all described using the square lithium-ion battery cell 121 as an example.

[0064] Please refer to Figure 4 , Figure 4 Schematic diagram of the exploded structure of a battery cell 121 provided in some embodiments of the present application. The battery cell 121 includes an end cap 122, a housing 123, an electrode assembly 124, and other functional components.

[0065] The end cap 122 is a component that covers the opening of the housing 123 to isolate the internal environment of the electrode assembly 124 from the external environment. The shape of the end cap 122 can be adapted to the shape of the housing 123 to fit the housing 123. Optionally, the end cap 122 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents the end cap 122 from deforming under pressure or collision, thereby enhancing the structural strength and safety of the battery cell 121. Functional components such as the electrode terminal 125 can be provided on the end cap 122. The electrode terminal 125 can be used to electrically connect to the electrode assembly 124 to transmit or receive electrical energy from the battery cell 121. In some embodiments, the end cap 122 can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 121 reaches a threshold. The end cap 122 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this is not particularly limited in this embodiment of the present application. In some embodiments, an insulating member may be provided inside the end cap 122 to isolate the electrical connection components in the housing 123 from the end cap 122 to reduce the risk of short circuit.

[0066] The housing 123 is a component that cooperates with the end cap 122 to form an internal environment for the battery cell 121. This internal environment can be used to accommodate the electrode assembly 124 and other components. The housing 123 and the end cap 122 can be separate components. An opening can be provided in the housing 123, and the end cap 122 can be placed over the opening to form the internal environment of the battery cell 121. Alternatively, the end cap 122 and the housing 123 can be integrated. Specifically, the end cap 122 and the housing 123 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 123 is to be enclosed, the end cap 122 can be placed over the housing 123. The housing 123 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, or a hexagonal prism. Specifically, the shape of the housing 123 can be determined based on the specific shape and size of the electrode assembly 124. The housing 123 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0067] The electrode assembly 124 is a component in the battery cell 121 where electrochemical reactions occur. One or more electrode assemblies 124 may be contained in the housing 123. The electrode assembly 124 is mainly formed by stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 124, and the portions of the positive and negative electrode sheets without active materials each constitute a tab (not shown). The positive tab and the negative tab 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 device, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode terminals 125 to form a current loop.

[0068] Figure 5 Schematic diagram of the exploded structure of the battery device provided in some embodiments of the present application. Figure 6 A schematic structural diagram of a battery device provided in some embodiments of the present application. Figure 7 Schematic diagram of the cooperation between the elastic component and the second end plate provided in some embodiments of the present application. Figure 8 Schematic diagram of the structure of the disc spring provided in some embodiments of the present application. Figure 9 Schematic diagram of local parameters of disc springs provided for some embodiments of the present application.

[0069] See Figures 1 to 9 As shown, a first aspect of the present application provides a battery device 100 including a plurality of stacked battery cells 121 and at least one set of elastic components 400 .

[0070] The outermost battery cells 121 among the multiple battery cells 121 abut against the elastic assembly 400. Each elastic assembly 400 includes at least two disc springs 410, with at least one disc spring 410 having a greater height-to-thickness ratio than the other disc springs 410. The compression stroke of the disc spring 410 is h0, the thickness of the disc spring 410 is t, and the height-to-thickness ratio of the disc spring 410 is defined as h0 / t.

[0071] In the embodiment of the present application, the battery cell 121 may be in a rectangular parallelepiped shape, and a plurality of battery cells 121 may be stacked along the first direction X to form the battery device module 120 .

[0072] The elastic component 400 is arranged at at least one end of the multiple battery cells 121 along the first direction X; that is, the outermost battery cell 121 at one end of the multiple battery cells 121 along the first direction X can be abutted against the elastic component 400, or the outermost battery cells 121 at both ends of the multiple battery cells 121 along the first direction X can be respectively abutted against the elastic component 400; the specific design shall prevail.

[0073] In related art, disc springs, also known as butterfly springs, have a zero-stiffness characteristic. During compression, the disc spring's compression curve exhibits a stress plateau. This stress plateau refers to the point within a certain compression range where, as the compression increases, the actual force applied by the disc spring 410 to the outside world changes slightly and remains constant.

[0074] The zero stiffness characteristics of disc springs can be based on the National Standard of the People's Republic of China GBT1972-2005.

[0075] Since the zero stiffness characteristic of the disc spring is generally 10% of its compression stroke height, in a battery device, after multiple battery cells are stacked, their volume expansion and contraction are often large. The 10% compression stroke height of the disc spring cannot cover this volume expansion and contraction, and therefore cannot maintain the stability of the external pressure during the charging and discharging process, thereby affecting the stability of the battery device performance.

[0076] In the embodiment of the present application, each elastic assembly 400 includes at least two disc springs 410, with at least one disc spring 410 having a greater height-to-thickness ratio than the other disc springs 410. This allows the elastic assembly 400 formed by the disc springs 410 to exhibit a wider range of zero-stiffness characteristics, meaning that the net force output by the elastic assembly 400 remains constant within a certain compression range. Consequently, when the battery cell 121 expands or contracts, the compression of the elastic assembly 400 increases or decreases accordingly, and the compression (strain) of the disc springs 410 with different height-to-thickness ratios changes accordingly. These combined effects ensure that the actual force applied by the elastic assembly 400 to the battery cell 121 varies minimally and tends to remain constant. Furthermore, the elastic assembly 400, comprised of the disc springs 410, can provide relatively constant pressure compensation to the battery cell 121. Ultimately, the battery cell 121 is maintained under a suitable and constant external pressure, ensuring the stable electrical performance of the battery device 100.

[0077] It should be noted that the net force output by each elastic assembly 400 is the sum of the actual forces output by its disc springs 410. The net force output by the elastic assembly 400 is constant within the target compression range, with the net force fluctuation typically remaining within plus or minus 10%. The target compression range of the elastic assembly 400 can be 0.5*h0 to 1.1*h0.

[0078] For example, if the preload requirement for battery cell 121 is 1 MPa-3 MPa, the number, specific dimensions, and parameters of disc springs 410 in elastic assembly 400 can be designed. By varying the number and dimensions of disc springs 410, the compression stroke h0 of disc springs 410, and the thickness t of disc springs 410, the preload requirement for battery cell 121 can be met, ensuring that the zero stiffness characteristic range of elastic assembly 400 falls between 1 MPa and 3 MPa.

[0079] Figure 10 A diagram showing the relationship between compression curves of disc springs at different height-to-thickness ratios provided in some embodiments of the present application, wherein the horizontal axis represents the ratio of compression amount to compression stroke, and the vertical axis represents the ratio of actual force to theoretical maximum force.

[0080] In some possible embodiments, see Figures 1 to 10 As shown, in each set of elastic components 400, the height-to-thickness ratio of at least one disc spring 410 is greater than 1.4; and the height-to-thickness ratio of at least one disc spring 410 is less than 1.4.

[0081] Specifically, combined Figure 10 Disc spring 410 with a height-to-thickness ratio of 1.4 typically exhibits a zero stiffness characteristic. That is, during compression, the compression curve exhibits a stress plateau segment. This stress plateau segment refers to the fact that, within a certain range, as the amount of compression increases, the actual force provided by disc spring 410 to the outside world changes slightly and tends to remain constant. If the height-to-thickness ratio of disc spring 410 is less than 1.4, the actual force provided by disc spring 410 to the outside world continuously increases as the amount of compression increases. If the height-to-thickness ratio of disc spring 410 is greater than 1.4, as the amount of compression increases, the actual force provided by disc spring 410 to the outside world first increases to a maximum value and then gradually decreases.

[0082] In this way, by setting each group of elastic components 400, at least one disc spring 410 has a height-to-thickness ratio greater than 1.4; at least one disc spring 410 has a height-to-thickness ratio less than 1.4; when the elastic component 400 is in a certain compression range, as the compression amount continues to increase, the actual force provided to the outside by the disc spring 410 with a height-to-thickness ratio less than 1.4 continues to increase, while the actual force provided to the outside by the disc spring 410 with a height-to-thickness ratio greater than 1.4 continues to decrease. As a result, the total force of each disc spring 410 changes little and tends to remain unchanged, thereby making the elastic component 400 formed by the combination of the disc springs 410 have a wider zero-stiffness characteristic, that is, the resultant force output by the elastic component 400 within a certain compression range can be constant; ultimately, the battery cell 121 can be placed under a suitable and constant external pressure, and the electrical performance of the battery device 100 can be ensured to be stable.

[0083] In some possible embodiments, see Figures 1 to 10 As shown, in each set of elastic components 400, at least one disc spring 410 is configured such that as the compression amount increases, the force value provided by the disc spring 410 first increases and then decreases. At least one disc spring 410 is configured such that as the compression amount increases, the force value provided by the disc spring 410 increases.

[0084] Combine Figure 10When the height-to-thickness ratio of disc spring 410 is greater than 1.4, as the amount of compression increases, the actual force provided by disc spring 410 to the outside first increases to a maximum value and then gradually decreases. When the height-to-thickness ratio of disc spring 410 is less than 1.4, as the amount of compression increases, the actual force provided by disc spring 410 to the outside continues to increase.

[0085] By setting up in each group of elastic components 400, at least one disc spring 410 has the force value provided by the disc spring 410 first increase and then decrease as the compression amount increases; at least one disc spring 410 has the force value provided by the disc spring 410 continuously increase as the compression amount increases. For the sake of ease of understanding, the former is called the first type of disc spring and the latter is called the second type of disc spring.

[0086] When the compression of the elastic component 400 is 0, as the compression continues to increase, the forces provided by the first and second disc springs both increase. At this time, the sum of the forces of each disc spring 410 continues to increase, and the force provided by the elastic component 400 gradually increases.

[0087] When the elastic component 400 reaches a certain compression range, as the compression amount continues to increase, the force provided by the first type of disc spring decreases, and the force provided by the second type of disc spring increases. At this time, the total force of each disc spring 410 changes little and tends to remain unchanged, thereby making the elastic component 400 formed by the combination of disc springs 410 have a wider zero stiffness characteristic, that is, the resultant force output by the elastic component 400 can be constant within a certain compression range; in this way, the battery cell 121 can be placed under appropriate and constant external pressure, and the electrical performance of the battery device 100 can be ensured to be stable.

[0088] Combine Figure 10 In the embodiment of the present application, the first type of disc spring can be a disc spring 410 with a relatively high height-to-thickness ratio, and the second type of disc spring can be a disc spring 410 with a relatively low height-to-thickness ratio.

[0089] In some other possible embodiments, the first type of disc spring may be a disc spring 410 with a relatively low height-to-thickness ratio, and the second type of disc spring may be a disc spring 410 with a relatively high height-to-thickness ratio. The present application does not impose any restrictions on this, as long as the elastic component 400 formed by the combination of disc springs 410 can have a wider zero-stiffness characteristic, that is, the resultant force output by the elastic component 400 can be constant within a certain compression range.

[0090] In some possible embodiments, see Figures 1 to 10As shown, when the compression amount of the elastic component 400 is within the target compression range, the force value provided by at least one disc spring 410 with a relatively high height-to-thickness ratio increases as the compression amount increases; the force value provided by at least one disc spring 410 with a relatively low height-to-thickness ratio decreases as the compression amount increases, so that the resultant force output by the elastic component 400 is constant; the target compression range is defined as 0.5*h0~1.1*h0.

[0091] Combine Figure 10 When the ratio of compression to compression stroke h0 is less than 0.5, the actual force provided by disc spring 410 to the outside continuously increases with increasing compression. When the ratio of compression to compression stroke h0 is greater than 0.5, disc spring 410 with a height-to-thickness ratio greater than 1.4 gradually decreases as the compression continues to increase; whereas disc spring 410 with a height-to-thickness ratio less than 1.4 continuously increases as the compression continues to increase.

[0092] By configuring each set of elastic assemblies 400 so that, when the compression of the elastic assembly 400 is within a target compression range, the force provided by at least one disc spring 410 having a relatively high height-to-thickness ratio increases as the compression increases, while the force provided by at least one disc spring 410 having a relatively low height-to-thickness ratio decreases as the compression increases, the resultant force output by the elastic assembly 400 is kept constant. For ease of understanding, the former is referred to as the first-type disc spring, and the latter is referred to as the second-type disc spring.

[0093] When the compression amount is 0, the elastic component 400 is not within the target range. As the compression amount increases, the forces provided by the first and second disc springs increase. At this time, the sum of the forces of each disc spring 410 continues to increase, and the force provided by the elastic component 400 gradually increases.

[0094] When the ratio of the compression amount to the compression stroke h0 is greater than 0.5, the compression amount of the elastic component 400 is within the target compression range. As the compression amount continues to increase, the force provided by the first type of disc spring decreases, and the force provided by the second type of disc spring increases. At this time, the total force of each disc spring 410 changes little and tends to remain unchanged, so that the elastic component 400 formed by the disc springs 410 has a wider zero stiffness characteristic, that is, the resultant force output by the elastic component 400 within the target compression range can be constant; in this way, the battery cell 121 can be placed under a suitable and constant external pressure, and the electrical performance of the battery device 100 can be ensured to be stable.

[0095] In the embodiment of the present application, the resultant force output by each set of elastic components 400 is the sum of the actual forces output by each disc spring 410 constituting the elastic component 400. The resultant force output by each set of elastic components 400 can be constant when in the target compression range, and the fluctuation range of the resultant force is generally kept within plus or minus 10%. Figure 10 , it can be known that the target compression range of the elastic component 400 is 0.5*h0~1.1*h0.

[0096] In some possible embodiments, see Figures 1 to 10 As shown, the target compression range can be further defined as 0.7*h0~0.9*h0.

[0097] In related art, the zero stiffness characteristic of a disc spring is generally 10% of its compression stroke height.

[0098] In the embodiment of the present application, the elastic component 400 is within the target compression range, and the target compression range is 0.7*h0~0.9*h0, which is much larger than 10% in the related art, thereby making the elastic component 400 formed by the disc spring 410 have a wider zero stiffness characteristic, that is, the resultant force output by the elastic component 400 within the target compression range can be constant; in this way, the battery cell 121 can be placed under appropriate and constant external pressure, and ensure that the electrical performance of the battery device 100 is stable.

[0099] Figure 11 A compression curve relationship diagram of the elastic component provided in some embodiments of the present application.

[0100] In some possible embodiments, see Figures 1 to 10 As shown, in each set of elastic components 400, the height-to-thickness ratio of one disc spring 410 is 1.7, and the height-to-thickness ratio of the other disc spring 410 is 1.3.

[0101] In the embodiment of the present application, each set of elastic components 400 includes only two disc springs, wherein the height-to-thickness ratio of one disc spring 410 is 1.7, and the height-to-thickness ratio of the other disc spring 410 is 1.3.

[0102] Combine Figure 11The compression curve of the elastic assembly shown in the figure shows that when the compression of the elastic assembly 400 is within the target compression range, as the compression continues to increase, the force provided by the disc spring 410 with a height-to-thickness ratio of 1.7 decreases, while the force provided by the disc spring 410 with a height-to-thickness ratio of 1.3 increases. At this point, the sum of the forces applied by the disc springs 410 changes little and tends to remain constant, thereby enabling the elastic assembly 400 formed by the disc springs 410 to exhibit a wider range of zero-stiffness characteristics. In other words, the net force output by the elastic assembly 400 remains constant within the target compression range. Furthermore, this compression curve is reversible. When the elastic assembly 400 is gradually unloaded, the pressure-compression-percentage relationship curve essentially matches the compression curve. Figure 11 The L segment shown in FIG. 1 is the zero stiffness characteristic segment of the elastic component 400 mentioned above.

[0103] In this way, by setting the height-to-thickness ratio of one disc spring 410 in each group of elastic components 400 to be 1.7 and the height-to-thickness ratio of the other disc spring 410 to be 1.3, the battery cell 121 can be placed under appropriate and constant external pressure, and the electrical performance of the battery device 100 can be ensured to be stable.

[0104] Figure 12 Compression curve relationship diagram of elastic components provided in other embodiments of the present application.

[0105] In some possible embodiments, see Figures 1 to 10 As shown, in each set of elastic components 400, the height-to-thickness ratio of one disc spring 410 is 1.8, and the height-to-thickness ratio of the other disc spring 410 is 1.1.

[0106] In the embodiment of the present application, each set of elastic components 400 includes only two disc springs, wherein the height-to-thickness ratio of one disc spring 410 is 1.8, and the height-to-thickness ratio of the other disc spring 410 is 1.1.

[0107] Combine Figure 12 As shown in the compression curve relationship diagram of the elastic assembly, when the compression of the elastic assembly 400 is within the target compression range, as the compression continues to increase, the force provided by the disc spring 410 with a height-to-thickness ratio of 1.8 decreases, while the force provided by the disc spring 410 with a height-to-thickness ratio of 1.1 increases. At this point, the sum of the forces applied by the disc springs 410 changes little and tends to remain constant, thereby allowing the elastic assembly 400 formed by the disc springs 410 to have a wider range of zero-stiffness characteristics. In other words, the net force output by the elastic assembly 400 is constant within the target compression range. Moreover, this compression curve is reversible. When the elastic assembly 400 is gradually unloaded, the relationship curve between pressure and compression percentage is basically consistent with the compression curve. Figure 12 The L segment shown in FIG. 1 is the zero stiffness characteristic segment of the elastic component 400 mentioned above.

[0108] In this way, by setting the height-to-thickness ratio of one disc spring 410 in each group of elastic components 400 to be 1.8 and the height-to-thickness ratio of the other disc spring 410 to be 1.1, the battery cell 121 can be placed under appropriate and constant external pressure, and the electrical performance of the battery device 100 can be ensured to be stable.

[0109] Figure 13 This is a compression curve relationship diagram of the elastic component provided in some embodiments of the present application.

[0110] In some possible embodiments, see Figures 1 to 10 As shown, in each set of elastic components 400, the height-to-thickness ratio of one disc spring 410 is 2, the height-to-thickness ratio of one disc spring 410 is 1.2, and the height-to-thickness ratio of the other disc spring 410 is 1.1.

[0111] In the embodiment of the present application, each group of elastic components 400 includes only three disc springs, one of the disc springs 410 has a height-to-thickness ratio of 2, one of the disc springs 410 has a height-to-thickness ratio of 1.2, and another of the disc springs 410 has a height-to-thickness ratio of 1.1.

[0112] Combine Figure 13 As shown in the compression curve relationship diagram of the elastic assembly, when the compression of the elastic assembly 400 is within the target compression range, as the compression continues to increase, the force provided by the disc spring 410 with a height-to-thickness ratio of 2 decreases, while the force provided by the disc spring 410 with a height-to-thickness ratio of 1.1 and the disc spring 410 with a height-to-thickness ratio of 1.2 both increase. At this point, the sum of the forces applied by the disc springs 410 changes little and tends to remain constant, thereby allowing the elastic assembly 400 formed by the disc springs 410 to have a wider range of zero-stiffness characteristics. In other words, the resultant force output by the elastic assembly 400 can be constant within the target compression range. Moreover, this compression curve is reversible. When the elastic assembly 400 is gradually unloaded, the relationship curve between pressure and compression percentage is basically consistent with the compression curve. Figure 13 The L segment shown in FIG. 1 is the zero stiffness characteristic segment of the elastic component 400 mentioned above.

[0113] In this way, by setting each group of elastic components 400, one disc spring 410 has a height-to-thickness ratio of 2, one disc spring 410 has a height-to-thickness ratio of 1.2, and the other disc spring 410 has a height-to-thickness ratio of 1.1, the battery cell 121 can be placed under appropriate and constant external pressure, and the electrical performance of the battery device 100 can be ensured to be stable.

[0114] In some other possible embodiments, each group of elastic components 400 may include two, three, four or even more disc springs 410. As long as the elastic components 400 formed by the combination of disc springs 410 can have a wider zero-stiffness characteristic by setting different height-to-thickness ratios for each disc spring 410, that is, the resultant force output by the elastic component 400 within the target compression range can be constant, this application does not impose any restrictions on this.

[0115] In some possible embodiments, see Figures 1 to 10 As shown, the height-to-thickness ratio of the disc spring 410 satisfies: 1.0≤h0 / t≤2.2.

[0116] By setting the height-to-thickness ratio of the disc spring 410 to be between 1.0 and 2.2; specifically, the height-to-thickness ratio of the disc spring 410 can be 1.0, 1.1, 1.2, 1.3, 1.45, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, or 2.2.

[0117] When the battery cell 121 expands or contracts, the compression of the elastic assembly 400 increases or decreases accordingly, and the compression (strain) of the disc springs 410 with different height-to-thickness ratios changes accordingly. These combined effects ensure that the actual force applied by the elastic assembly 400 to the battery cell 121 varies minimally and tends to remain constant. Furthermore, the elastic assembly 400, comprised of the disc springs 410, provides relatively constant pressure compensation to the battery cell 121. Ultimately, the battery cell 121 is maintained under appropriate and constant external pressure, ensuring the stable electrical performance of the battery device 100.

[0118] In some possible embodiments, see Figures 1 to 10 As shown, the battery device includes a box body 110 and a first end plate 500; the box body 110 is used to accommodate multiple battery cells 121; the first end plate 500 is arranged on the outside of the outermost battery cell 121 among the multiple battery cells 121; the elastic component 400 elastically abuts against the first end plate 500.

[0119] The first end plate 500 may substantially correspond to a square or rectangular shape forming a side surface of the battery cell 121 .

[0120] The battery device 100 may include an expansion beam 600 disposed in the housing 110 to define a space for accommodating the battery cells 121 . One end of the elastic component 400 abuts against the expansion beam 600 , and the other end elastically abuts against the first end plate 500 .

[0121] In this way, the first end plate 500 can effectively and evenly distribute the force of each disc spring 410, preventing the battery cells 121 from being crushed. Simultaneously, the elastic assembly 400 can constrain the movement and deformation of the battery cells 121 in the first direction X, ensuring that the actual force applied by the elastic assembly 400 to the battery cells 121 varies minimally and tends to remain constant. Furthermore, the elastic assembly 400, comprised of the disc springs 410, can provide relatively constant pressure compensation to the battery cells 121. Ultimately, the battery cells 121 are subjected to an appropriate and constant external pressure, ensuring the stable electrical performance of the battery device 100.

[0122] In some possible embodiments, see Figures 1 to 10 As shown, the battery device further includes a second end plate 700 . The second end plate 700 is located on a side of the elastic component 400 away from the first end plate 500 , and is sandwiched between the second end plate 700 and the first end plate 500 .

[0123] The second end plate 700 may substantially correspond to a square or rectangular shape forming side surfaces of the battery cells 121 .

[0124] The elastic assembly 400 elastically abuts the first end plate 500. The second end plate 700 is disposed between the expansion beam 600 and the elastic assembly 400, on the side of the elastic assembly 400 away from the first end plate 500. By positioning the second end plate 700 between the expansion beam 600 and the elastic assembly 400, the second end plate 700 effectively and evenly distributes the force applied by the disc springs 410, preventing the expansion beam 600 from being crushed. Simultaneously, the elastic assembly 400 constrains the movement and deformation of the battery cell 121 in the first direction X, ensuring that the actual force applied by the elastic assembly 400 to the battery cell 121 varies minimally and tends to remain constant. Furthermore, the elastic assembly 400, comprised of the disc springs 410, provides relatively constant pressure compensation to the battery cell 121. Ultimately, the battery cell 121 is subjected to a suitable and constant external pressure, ensuring the stable electrical performance of the battery device 100.

[0125] In some possible embodiments, see Figures 1 to 10 As shown, in each group of elastic components 400, all disc springs 410 are arranged in a row along the second direction Y, and the second direction Y is arranged to intersect with the first direction X.

[0126] The disc springs 410 with a relatively high height-to-thickness ratio and the disc springs 410 with a relatively low height-to-thickness ratio are arranged alternately in sequence.

[0127] This ensures that the actual force applied by the elastic assembly 400 to the battery cell 121 varies minimally and remains constant. Furthermore, the elastic assembly 400, comprised of the disc spring 410, can provide relatively constant pressure compensation to the battery cell 121. Ultimately, the battery cell 121 is subjected to an appropriate and constant external pressure, ensuring the stable electrical performance of the battery device 100.

[0128] In some possible embodiments, combined with Figures 5 to 8 As shown, each disc spring 410 includes a bell mouth 411 located at the end with a larger outer diameter.

[0129] In each set of elastic components 400 , the bell mouths 411 of the disc springs 410 with a relatively high height-to-thickness ratio and the bell mouths 411 of the disc springs 410 with a relatively low height-to-thickness ratio face toward the battery cells 121 .

[0130] Specifically, the disc spring 410 is a truncated cone-shaped thin-walled shell structure; the bell mouths 411 of all the disc springs 410 face the same side.

[0131] In this way, the actual force direction provided by the bell mouth 411 of each disc spring 410 in the elastic component 400 to the battery cell 121 is consistent. When the compression amount of the elastic component 400 is within the target compression range, it can ensure that the resultant force output by the elastic component 400 changes little and tends to remain unchanged.

[0132] In some possible embodiments, see Figures 1 to 10 As shown, the disc spring 410 has a center hole 412 in the middle portion of the side away from the bell mouth 411. The second end plate 700 is provided with a plurality of positioning portions 710. The center hole 412 of each disc spring 410 is sleeved on a corresponding positioning portion 710. The positioning portions 710 are used to be sleeved by the center hole 412 of the disc spring 410 to limit the movement of the disc spring 410 on the second end plate 700.

[0133] By providing multiple positioning portions 710 on the second end plate 700, the center hole 412 of each disc spring 410 is fitted over the corresponding positioning portion 710, providing initial positioning for the disc spring 410, facilitating quick assembly of the disc spring 410 and reducing assembly difficulty. Furthermore, the positioning portions 710 cooperate with the disc spring 410 to restrict movement of the disc spring 410 on its surface, ensuring that the disc spring 410 remains in a predetermined position on the second end plate 700. When the battery cell 121 expands or contracts, the compression of the elastic assembly 400 is increased or decreased accordingly, preventing the disc spring 410 from shifting.

[0134] A second aspect of an embodiment of the present application provides an electrical device, including the above-mentioned battery device 100, and the battery device 100 is used to provide electrical energy.

[0135] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0136] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery device, characterized in that: The battery device comprises: a plurality of stacked battery cells (121); and At least one set of elastic components (400), wherein the outermost battery cells (121) among the plurality of battery cells (121) are in abutment with the elastic components (400); Each group of the elastic components (400) includes at least two disc springs (410), and the height-to-thickness ratio of at least one of the disc springs (410) is greater than the height-to-thickness ratios of the other disc springs (410); The compression stroke of the disc spring (410) is h0, the plate thickness of the disc spring (410) is t, and the height-to-thickness ratio of the disc spring (410) is defined as h0 / t; In each group of the elastic components (400), at least one of the disc springs (410) is configured such that: as the compression amount of the disc spring (410) increases, the force value provided by the disc spring (410) first increases and then decreases; At least one of the disc springs (410) is configured such that as the compression amount of the disc spring (410) increases, the force value provided by the disc spring (410) increases.

2. The battery device according to claim 1, wherein: In each group of the elastic components (400), the height-to-thickness ratio of at least one of the disc springs (410) is greater than 1.4; and the height-to-thickness ratio of at least one of the disc springs (410) is less than 1.

4.

3. The battery device according to claim 1, wherein: When the compression amount of the elastic component (400) is within the target compression range, the force value provided by at least one disc spring (410) with a relatively high height-to-thickness ratio in the elastic component (400) increases as the compression amount increases; and the force value provided by at least one disc spring (410) with a relatively low height-to-thickness ratio decreases as the compression amount increases, so that the resultant force output by the elastic component (400) is constant. The target compression range is defined as 0.5*h0~1.1*h0.

4. The battery device according to claim 3, characterized in that The target compression range is defined as 0.7*h0~0.9*h0.

5. The battery device according to any one of claims 1 to 4, characterized in that: In each group of the elastic components (400), the height-to-thickness ratio of one of the disc springs (410) is 1.7, and the height-to-thickness ratio of another disc spring (410) is 1.

3.

6. The battery device according to any one of claims 1 to 4, characterized in that: In each group of the elastic components (400), the height-to-thickness ratio of one of the disc springs (410) is 1.8, and the height-to-thickness ratio of another disc spring (410) is 1.

1.

7. The battery device according to any one of claims 1 to 4, characterized in that: Each group of the elastic components (400) includes three disc springs (410), wherein the height-to-thickness ratio of one of the disc springs (410) is 2, the height-to-thickness ratio of one of the disc springs (410) is 1.2, and the height-to-thickness ratio of another disc spring (410) is 1.

1.

8. The battery device according to any one of claims 1 to 4, characterized in that: The height-to-thickness ratio of the disc spring (410) satisfies: 1.0≤h0 / t≤2.

2.

9. The battery device according to any one of claims 1 to 4, characterized in that: The battery device comprises a first end plate (500); the first end plate (500) is arranged outside the outermost battery cell (121) among the plurality of battery cells (121); and the elastic component (400) elastically abuts against the first end plate (500).

10. The battery device according to claim 9, characterized in that The battery device further comprises a second end plate (700), the second end plate (700) being located on a side of the elastic component (400) away from the first end plate (500), and the elastic component (400) being sandwiched between the second end plate (700) and the first end plate (500).

11. The battery device according to any one of claims 1 to 4, characterized in that: In each group of the elastic components (400), the disc springs (410) with a relatively high height-to-thickness ratio and the disc springs (410) with a relatively low height-to-thickness ratio are arranged alternately in sequence.

12. The battery device according to any one of claims 1 to 4, characterized in that: Each disc spring (410) includes a bell mouth (411) located at an end with a larger outer diameter; In the elastic component (400), the bell mouth (411) of the disc spring (410) with a relatively high height-to-thickness ratio and the bell mouth (411) of the disc spring (410) with a relatively low height-to-thickness ratio face the battery cell (121).

13. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1 to 12.

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