Battery device and electric appliance

Abstract

The application belongs to the technical field of battery equipment, and particularly relates to a battery device and an electric equipment. The battery device comprises a box body, at least one battery monomer and at least one elastic component. An accommodating cavity is formed in the inside of the box body, the battery monomer is arranged in the accommodating cavity, the elastic component is arranged in the accommodating cavity and at least one side of the battery monomer along a first direction. The elastic component comprises a first plate body and a second plate body which are oppositely arranged along the first direction. The first plate body or the second plate body is in contact with at least one surface of the battery monomer. The elastic component further comprises a plurality of supporting rods arranged between the first plate body and the second plate body. One end of the supporting rod along the first direction is connected with one of the first plate body and the second plate body. The other end of the supporting rod along the first direction is connected with or abuts against the other of the first plate body and the second plate body. According to the battery device, the extrusion deformation of the battery monomer can be reduced, and the uneven force between the battery monomers can be reduced.

Description

Technical Field

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

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

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

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

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

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

[0007] At least one elastic component is disposed within a receiving cavity and disposed on at least one side of a battery cell along a first direction. The elastic component includes a first plate and a second plate disposed opposite to each other along the first direction. The first plate or the second plate is in contact with at least one surface of the battery cell. The elastic component also includes a plurality of support rods disposed between the first plate and the second plate. One end of the support rod along the first direction is connected to one of the first plate and the second plate, and the other end of the support rod along the first direction is connected to or abuts against the other of the first plate and the second plate. The support rod is configured to have a yield state under compression, and the support rod in the yield state has a zero stiffness region.

[0008] The length of the support rod along its own axis is L, where L≥H*a / b, where H is the thickness of the battery cell along the first direction, a is the expansion ratio of the battery cell during charging and discharging, and b is the zero stiffness strain range of the support rod.

[0009] According to the battery device of the present application, when the elastic assembly is arranged on one side of the battery monomer along the first direction, the battery monomer can extrude the elastic assembly when the box is subjected to external impact or the battery monomer in the box is deformed by swelling, when the elastic assembly bears initial pressure, the support rod is in an elastic stage and has good load bearing capacity, thereby reducing the extrusion deformation of the battery monomer, with further extrusion of the elastic assembly, the compression stress of the support rod increases with the increase of the compression strain, the support rod enters a yield state, and the support rod in the yield state has a zero stiffness region. Near the zero stiffness region, the elastic assembly has a certain displacement amount for buffering the extrusion force, and the elastic reaction provided is extremely small, even close to zero, thereby reducing the uneven force between the battery monomers. At the same time, the length dimension of the support rod can be calculated through the thickness dimension of the battery monomer, thereby arranging the elastic assembly according to the corresponding length dimension of the support rod, and providing a buffer force for the battery monomer through the elastic assembly, reducing the extrusion deformation of the battery monomer and the uneven force between the battery monomers.

[0010] In some embodiments of the present application, the two ends of the plurality of support rods along the first direction are respectively connected with the first plate body and the second plate body.

[0011] By connecting the two ends of the support rod along the first direction with the first plate body and the second plate body respectively, the connection strength of the support rod in the elastic assembly can be improved, and in the case of extrusion of the elastic assembly, the support rod can stably deform.

[0012] In some embodiments of the present application, a part of the plurality of support rods are respectively connected with the first plate body and the second plate body along the two ends of the support rod along the first direction, and another part of the plurality of support rods are connected with the first plate body or the second plate body.

[0013] By connecting a part of the support rods with the first plate body and the second plate body respectively, the first plate body and the second plate body are connected by the support rods to form the elastic assembly, and another part of the support rods are connected with the first plate body or the second plate body, so that the support rods can be fixed in the elastic assembly, and the assembly of the elastic assembly is facilitated.

[0014] In some embodiments of the present application, at least one end of the support rod is connected with the first plate body or the second plate body by fixed connection or hinging.

[0015] By connecting the support rod and the first plate body by fixed connection or hinging, the support rod can be connected to the first plate body in multiple ways. By connecting the support rod and the second plate body by fixed connection or hinging, the support rod can be connected to the second plate body in multiple ways.

[0016] In some embodiments of the present application, the support rod comprises a metal support rod.

[0017] By setting the support rod as a metal support rod, the metal support rod has good support and bending properties, thereby being capable of providing support for the battery monomers and being capable of providing a zero-stiffness region, thereby reducing uneven stress between the battery monomers.

[0018] In some embodiments of the present application, the elastic assembly further comprises an elastic piece, the elastic piece being clamped between the first plate body and the second plate body.

[0019] By clamping the elastic piece between the first plate body and the second plate body, the resilience of the elastic assembly can be improved, thereby returning to the original state when the elastic assembly is no longer extruded and being capable of providing a buffering force for the next extrusion.

[0020] In some embodiments of the present application, the elastic piece comprises at least one of silica gel and polyurethane.

[0021] Silica gel and polyurethane respectively have good elastic recovery force, thereby being conducive to the elastic assembly returning to the original state when not extruded, and silica gel and polyurethane are easy to fill between the first plate body and the second plate body, facilitating the overall molding of the elastic assembly.

[0022] In some embodiments of the present application, the battery device comprises a plurality of battery monomers arranged at intervals along a first direction, and at least two adjacent battery monomers are clamped with an elastic assembly.

[0023] By clamping the elastic assembly between at least two adjacent battery monomers, the elastic assembly can provide a buffering force for the battery monomers on both sides, respectively, and can provide a zero-stiffness region during deformation of the elastic assembly, thereby reducing extrusion deformation and uneven stress of the battery monomers on both sides.

[0024] In some embodiments of the present application, along the first direction, at least one of the battery monomers located at the two ends of the plurality of battery monomers is clamped with an elastic assembly between the inner side wall of the box.

[0025] By clamping the elastic assembly between at least one of the battery monomers located at the two ends and the inner side wall of the box, the elastic assembly can provide a buffering force for at least one of the battery monomers close to the inner side wall of the box, and can provide a zero-stiffness region during deformation of the elastic assembly, thereby reducing extrusion deformation of the battery monomers at the at least one end.

[0026] In some embodiments of the present application, the elastic assembly is in a compressed state inside the box.

[0027] By arranging the elastic assembly in a compressed state inside the box, i.e. providing a pre-tightening force by the elastic assembly before the battery monomer is deformed, and extruding the battery monomer in the first direction, the adhesion between the electrolyte and the electrode in the battery monomer is promoted, the interface impedance is reduced, and the electrochemical performance of the battery monomer is improved.

[0028] In some embodiments of the present application, the battery monomer includes a first surface with the largest area, the first surface intersects the first direction, and the first plate body or the second plate body is attached to the first surface of the battery monomer.

[0029] By attaching the first plate body or the second plate body to the first surface, the buffering force provided by the elastic assembly can act on the first surface, so that compared with the buffering force acting on other surfaces of the battery monomer, the buffering force of the elastic assembly can be dispersed, and the deformation of the battery monomer is reduced.

[0030] In a second aspect, the present application provides a power consumption device, which has the battery device of any one of the above.

[0031] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0032] 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 to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in the attached drawings indicate the same or similar components. In the drawings:

[0033] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0034] Figure 2 is a structural schematic diagram of a battery device provided by an embodiment of the present application;

[0035] Figure 3 is a structural schematic diagram of a battery monomer assembly provided by an embodiment of the present application;

[0036] Figure 4 is an exploded structural schematic diagram of a battery monomer provided by an embodiment of the present application;

[0037] Figure 5 is a structural schematic diagram of the distribution mode of the battery monomer and the elastic assembly in the battery device provided by an embodiment of the present application;

[0038] Figure 6is a partial structure diagram of an elastic assembly provided by an embodiment of the present application;

[0039] Figure 7 is Figure 6 is a top view of the elastic assembly in the first plate body is removed from

[0040] Figure 8 is Figure 6 is a structure diagram of the support rod in the elastic assembly.

[0041] The reference signs in the detailed description are as follows:

[0042] 1, vehicle;

[0043] 10, battery device; 11, controller; 12, motor;

[0044] 20, battery cell assembly; 21, battery cell; 211, end cover; 212, shell; 2121, first surface; 213, electrode assembly; 214, electrode terminal;

[0045] 30, box; 301, first box; 302, second box; 31, first side plate; 32, second side plate;

[0046] 40, elastic assembly; 41, first plate body; 42, second plate body; 43, support rod; 431, first end; 432, second end;

[0047] X, first direction. DETAILED DESCRIPTION

[0048] The embodiments of the technical solutions 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 solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0049] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by the skilled in the art to which the embodiments of the present application belong.

[0050] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0051] In addition, the technical terms "first", "second" and the like are only for descriptive 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 "a plurality of" is to include two or more, unless otherwise explicitly specified and limited.

[0052] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0053] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0054] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of hydroelectric, thermal, wind and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment and aerospace and other fields. Lithium ion battery has been widely used in mobile and portable electric appliances due to its high energy density, high average open circuit voltage and long cycle life.

[0055] During the grouping process of the all-solid-state battery system, a buffer pad is usually needed to be added between the battery cells to achieve uniform stress. However, the material properties (such as creep relaxation) of the buffer pad can cause the stress between the battery cells to gradually decrease over time, thereby causing uneven stress problems. Such 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.

[0056] To solve the problem of uneven stress of the battery cells, the present application provides a battery device and an electric equipment with the battery device. According to the battery device and the electric equipment of the present application, the battery device of the present application can provide effective buffering for the battery cells, reduce the problems of compression deformation of the battery cells and uneven stress between the battery cells, and further reduce the problems of internal short circuit or thermal runaway of the battery cells.

[0057] The battery device mentioned in the embodiments of the present 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.

[0058] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0059] In some embodiments, the battery device can be a battery pack including a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0060] As an 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.

[0061] As an 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.

[0062] As an 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 so that a closed space is formed 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.

[0063] As an 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.

[0064] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0065] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0066] In some embodiments, the energy storage device includes one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery modules connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0067] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application can be any power system that requires energy storage devices.

[0068] The technical solutions described in this application are applicable to various electrical devices and energy storage devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, spacecraft and energy storage containers, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0069] Figure 1 This is a structural schematic diagram of vehicle 1 provided for some embodiments of this application. For example... Figure 1 As shown, vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1, and the battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1; for example, the battery device 10 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 11 and a motor 12. The controller 11 is used to control the battery device 10 to supply power to the motor 12, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0070] In some embodiments of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0071] Figure 2 A schematic view of a battery device 10 according to an embodiment of the present application. Figure 3 A 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 of 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. The plurality of battery cells 21 can be connected in series, in parallel, or in a mixed connection, which is a mixture of series and parallel connections.

[0072] 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 in the interior of 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 cuboid or a cylinder or a sphere, or a complex cuboid structure composed of a simple cuboid or a cylinder or a sphere. The material of the box 30 can be an alloy material such as an aluminum alloy or an iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber reinforced epoxy resin.

[0073] 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 jointly 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 jointly define the space for accommodating the battery cells 21 with the second box 302; 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.

[0074] 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 mixed manner to form the battery cell assembly 20, and the plurality of battery cell assemblies 20 can be connected in series or in parallel or in a mixed manner to form the battery device 10. The battery cell 21 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, which are not limited in the embodiments of the present application. The battery cell 21 is generally divided into three types according to the packaging manner: cylindrical battery cell, square battery cell, and soft-pack battery cell, which are not limited in the embodiments of the present application. For the sake of simplicity, the square lithium-ion battery cell 21 is taken as an example for description in the following embodiments.

[0075] Figure 4 The exploded structural view of the battery cell 21 is provided for some embodiments of the present application. The battery cell 21 refers to the smallest unit of the battery device 10. As shown in FIG. 1, the battery cell 21 includes an end cover 211, a shell 212, and an electrode assembly 213. Figure 4

[0076] The end cover 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 cover 211 can be adapted to the shape of the shell 212 to fit the shell 212. Optionally, the end cover 211 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 211 is not easy to deform when subjected to extrusion and collision, so that the battery cell 21 can have higher structural strength, and the safety performance can also be improved. The end cover 211 can be provided with functional components such as the electrode terminal 214. The electrode terminal 214 can be used to electrically connect with the electrode assembly 213 for outputting or inputting the electrical energy of the battery cell 21. In some embodiments, the end cover 211 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 21 when the internal pressure or temperature reaches a threshold value. In some embodiments, an insulating member can also be provided on the inner side of the end cover 211, which can be used to isolate the electrical connection components in the shell 212 from the end cover 211 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, or the like.

[0077] ​The shell 212 is a component for fitting the end cover 211 to form an internal environment of the battery cell 21, wherein the formed internal environment can be used to accommodate the electrode assembly 213, electrolyte (not shown in the figure), and other components. The shell 212 and the end cover 211 can be independent components, and an opening can be provided on the shell 212, and the end cover 211 is made to cover the opening to form the internal environment of the battery cell 21. Without limitation, the end cover 211 and the shell 212 can also be integrated, specifically, the end cover 211 and the shell 212 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 212, the end cover 211 is made to cover the shell 212. The shell 212 can be of various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell 212 can be determined according to the specific shape and size of the electrode assembly 213. The material of the shell 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0078] The electrode assembly 213 is a component in which electrochemical reactions occur in the battery cell 21. One or more electrode assemblies 213 can be contained in the shell 212. The electrode assembly 213 is mainly formed by winding or stacking the positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The positive and negative electrode sheets have parts of active materials constituting the main body of the electrode assembly 213, and parts of the positive and negative electrode sheets without active materials each constitute a tab (not shown in the figure). The positive and negative tabs can be located at one end of the main body or at two ends of the main body, respectively. In the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs are connected to the electrode terminal 214 to form a current loop.

[0079] In combination Figure 2 , Figures 5 to 8As shown, the first aspect of the present application proposes a battery device 10, the battery device 10 comprising a box 30, at least one battery cell 21 and at least one elastic assembly 40, the box 30 having an accommodating cavity formed in an interior thereof, the battery cell 21 being arranged in the accommodating cavity, the elastic assembly 40 being arranged in the accommodating cavity and at least one side of the battery cell 21 along a first direction X, the elastic assembly 40 comprising a first plate body 41 and a second plate body 42 oppositely arranged along the first direction X, the first plate body 41 or the second plate body 42 being fitted with at least one surface of the battery cell 21, the elastic assembly 40 further comprising a plurality of support rods 43 arranged between the first plate body 41 and the second plate body 42, one end of the support rod 43 along the first direction X being connected with one of the first plate body 41 and the second plate body 42, the other end of the support rod 43 along the first direction X being connected with or abutting against the other of the first plate body 41 and the second plate body 42, the support rod 43 being configured to have a yield state in a state of being extruded, and the support rod 43 in the yield state having a zero stiffness region.

[0080] Specifically, the box 30 forms the overall appearance structure of the battery device 10 and protects the battery cell 21 located in the interior thereof.

[0081] The number of the at least one battery cell 21 can be one or more, when the number of the battery cell 21 is more than one, the plurality of battery cells 21 can be collectively arranged in the accommodating cavity of the box 30 and form at least one battery cell assembly 20 in a series connection, parallel connection or mixed connection manner, so as to improve the output power of the battery device 10. For the convenience of description, the present application only takes the number of the battery cell 21 as more than one and the plurality of battery cells 21 forming the battery cell assembly 20 as an example for description.

[0082] The number of the at least one elastic assembly 40 can be one or more, when the number of the elastic assembly 40 is more than one, the elastic assembly 40 can be arranged between adjacent battery cells 21 or between the battery cell 21 and the inner side wall of the box 30 and fitted with the battery cell 21, so as to provide a buffering force for the battery cell 21 when the battery cell 21 deforms. Wherein, the deformation of the battery cell 21 includes deformation under external force or self-expansion deformation of the battery cell 21.

[0083] In this configuration, at least one side of the battery cell 21 along the first direction X is provided with an elastic component 40. The elastic component 40 includes a first plate 41 and a second plate 42 disposed on opposite sides of the elastic component 40 along the first direction X. One of the first plate 41 and the second plate 42 is in contact with at least one surface of the battery cell 21. Optionally, when the battery cell 21 is disposed between two adjacent battery cells 21 along the first direction X, the first plate 41 of the elastic component 40 is in contact with one of the battery cells 21, and the second plate 42 of the elastic component 40 is in contact with the other battery cell 21. When the battery cell 21 is disposed between the battery cell 21 and the inner wall of the housing 30 along the first direction X, one of the first plate 41 and the second plate 42 of the elastic component 40 is in contact with the battery cell 21, and the other of the first plate 41 and the second plate 42 of the elastic component 40 is in contact with the inner wall of the housing 30.

[0084] Multiple support rods 43 are provided between the first plate 41 and the second plate 42. Optionally, the multiple support rods 43 are arranged in a square array between the first plate 41 and the second plate 42. The support rods 43 are rod-shaped structures and have axial and transverse dimensions, wherein the axial dimension of the support rod 43 is greater than the transverse dimension of the support rod 43, and the transverse dimension of the support rod 43 is perpendicular to the axial dimension of the support rod 43. Optionally, the support rod 43 has a transverse cross-section perpendicular to its own axial direction, referred to as a cross section, which can be circular, square, or other regular or irregular shapes. Optionally, the axial direction of the support rod 43 is parallel to the first direction X, or forms an angle greater than 0 degrees and less than 90 degrees with the first direction X.

[0085] The support rod 43 includes a first end 431 and a second end 432 disposed at opposite ends along a first direction X. The first end 431 is located at the end of the support rod 43 facing the first plate 41, and the second end 432 is located at the end of the support rod 43 facing the second plate 42. Optionally, the first end 431 is connected to the first plate 41, and the second end 432 is connected to or abuts against the second plate 42. When the second end 432 abuts against the second plate 42, the second end 432 is a free end and can be deformed by the compression of the second plate 42. Alternatively, the second end 432 is connected to the second plate 42, and the first end 431 is connected to or abuts against the first plate 41. When the first end 431 abuts against the first plate 41, the first end 431 is a free end and can be deformed by the compression of the first plate 41.

[0086] According to the battery device 10 of the present application, by arranging the elastic assembly 40 at one side of the battery monomer 21 along the first direction X, when the box 30 is subjected to external impact or the battery monomer 21 in the box 30 is subjected to swelling deformation, the battery monomer 21 can extrude the elastic assembly 40, when the elastic assembly 40 is subjected to initial pressure, the support rod 43 is in an elastic stage and has good bearing capacity, thereby reducing the extrusion deformation of the battery monomer 21, with further extrusion of the elastic assembly 40, the compression stress of the support rod 43 increases with the increase of the compression strain, the support rod 43 enters a yield state, and the support rod 43 in the yield state has a zero stiffness region. Near the zero stiffness region, the elastic assembly 40 has a certain displacement amount for buffering the extrusion force, and the elastic reaction provided is extremely small, even close to zero, thereby reducing the uneven force condition between the battery monomers 21.

[0087] In combination Figures 5 to 8 As shown in the drawings, in some embodiments of the present application, the plurality of support rods 43 are connected with the first plate body 41 and the second plate body 42 at two ends along the first direction X respectively.

[0088] Specifically, the first end portions 431 of the plurality of support rods 43 are connected with the first plate body 41 respectively, and the second end portions 432 of the plurality of support rods 43 are connected with the second plate body 42 respectively. Optionally, the first plate body 41, the second plate body 42 and the support rod 43 are in a split structure, and in the process of assembling into the elastic assembly 40, the two ends of the support rod 43 are connected with the first plate body 41 and the second plate body 42 respectively. Alternatively, the first plate body 41, the second plate body 42 and the support rod 43 are in an integrated structure, for example, metal parts can be formed by integral casting, integral cold pressing or integral hot pressing, and for example, plastic parts can be formed by integral injection molding.

[0089] By connecting the two ends of the support rod 43 with the first plate body 41 and the second plate body 42 along the first direction X respectively, the connection strength of the support rod 43 in the elastic assembly 40 can be improved, and in the case of extrusion of the elastic assembly 40, the support rod 43 can stably deform.

[0090] In combination Figures 5 to 8 As shown in the drawings, in some embodiments of the present application, a part of the plurality of support rods 43 are connected with the first plate body 41 and the second plate body 42 at two ends along the first direction X respectively, and another part of the plurality of support rods 43 are connected with the first plate body 41 or the second plate body 42.

[0091] Specifically, the first end 431 of a part of the support rods 43 is connected to the first plate body 41, and the second end 432 is connected to the second plate body 42, so that the first plate body 41 and the second plate body 42 are connected by the two ends of the support rods 43, and the elastic assembly 40 is formed. Meanwhile, the remaining part of the support rods 43 is connected to the plate body by one end. Alternatively, the first end 431 of the remaining part of the support rods 43 is connected to the first plate body 41, and the second end 432 is abutted to the second plate body 42. Alternatively, the second end 432 of the remaining part of the support rods 43 is connected to the second plate body 42, and the first end 431 is abutted to the first plate body 41.

[0092] By connecting a part of the support rods 43 to the first plate body 41 and the second plate body 42 respectively, the first plate body 41 and the second plate body 42 are connected by the support rods 43, and the elastic assembly 40 is formed, and the other part of the support rods 43 is connected to the first plate body 41 or the second plate body 42, so that the support rods 43 are fixed in the elastic assembly 40, and the assembly of the elastic assembly 40 is facilitated.

[0093] In combination Figures 5 to 8 As shown in some embodiments of the present application, at least one end of the support rod 43 is connected to the first plate body 41 or the second plate body 42 by fixed connection or hinged connection.

[0094] Specifically, the first end 431 and the first plate body 41 can be fixedly connected, including welding, bonding or clamping, that is, the first end 431 and the first plate body 41 cannot move relative to each other. Alternatively, the first end 431 and the first plate body 41 can be hinged, so that in the process of the elastic assembly 40 being extruded, the support rod 43 can rotate relative to the first plate body 41 through the first end 431.

[0095] The second end 432 and the second plate body 42 can be fixedly connected, including welding, bonding or clamping, that is, the second end 432 and the second plate body 42 cannot move relative to each other. Alternatively, the second end 432 and the second plate body 42 can be hinged, so that in the process of the elastic assembly 40 being extruded, the support rod 43 can rotate relative to the second plate body 42 through the second end 432.

[0096] Connecting the support rod 43 and the first plate body 41 by fixed connection or hinged connection can make the support rod 43 connected to the first plate body 41 in multiple ways. Connecting the support rod 43 and the second plate body 42 by fixed connection or hinged connection can make the support rod 43 connected to the second plate body 42 in multiple ways.

[0097] In combination Figures 5 to 8 As shown in some embodiments of the present application, the support rod 43 has a slenderness ratio , wherein, is a coefficient, when one end of the support rod 43 is free and the other end is fixedly connected, ; when one end of the support rod 43 is hinged and the other end is fixed, ; when both ends of the support rod 43 are fixed, ; when both ends of the support rod 43 are hinged, , is the length dimension of the support rod 43 along the axial direction of itself, is the turning radius dimension of the support rod 43, wherein, , π is the circular constant, is the yield strength of the material forming the support rod 43, and E is the elastic modulus of the material forming the support rod 43.

[0098] Specifically, the slenderness ratio of the support rod 43 refers to the ratio of the calculated length of the support rod member to the turning radius of its cross section, which is an important parameter for measuring the rigidity and stability of the rod member. This parameter comprehensively reflects the geometric size, end constraint condition and cross section characteristics of the rod member. The larger the slenderness ratio, the more slender the rod member, the worse the stability, and the more prone to buckling instability under compression. Therefore, in order to improve the stability of the support rod 43 and make the support rod 43 have a zero stiffness region after reaching the yield strength, the slenderness ratio of the support rod 43 should satisfy The calculated length of the support rod 43 in the present application is the axial length of the support rod 43, and the cross-sectional turning radius of the support rod 43 is the cross-sectional turning radius of the support rod 43. Wherein, one end of the support rod 43 has no connection relationship with the plate body, and only abuts therebetween, then one end of the support rod 43 can be considered as a free end.

[0099] By setting , the slenderness ratio of the support rod 43 can be reduced, so that the support rod 43 can more stably support the battery monomer 21, and the support rod 43 can reach the yield strength as soon as possible in the process of being extruded and have a zero stiffness region.

[0100] As shown in Figures 5 to 8 , in some embodiments of the present application, , wherein I is the cross-sectional moment of inertia, when the cross section of the support rod 43 along the direction perpendicular to the axial direction of itself is rectangular, and the long side dimension of the cross section is h and the short side dimension is b, the cross-sectional moment of inertia , when the cross-sectional area of the support rod 43 along the direction perpendicular to the axial direction of itself is circular, and the diameter dimension of the cross section is d, the cross-sectional moment of inertia , and A is the cross-sectional dimension of the support rod 43 along the direction perpendicular to the axial direction of itself.

[0101] Specifically, in order to facilitate the manufacture of the support rod 43, the cross section of the support rod 43 is generally long or circular. The square is a special rectangle, that is, the long side size h of the cross section of the rectangle is equal to the short side size b.

[0102] By setting the circular cross section or the rectangular cross section, the cross-sectional moment of inertia of the support rod 43 can be adjusted, and then the radius of gyration and the slenderness ratio of the support rod 43 are adjusted. Correspondingly, according to the slenderness ratio of the support rod 43, the radius of gyration and the cross-sectional moment of inertia of the support rod 43 can be determined, so that the support rod 43 with the corresponding cross-sectional shape is selected.

[0103] In combination Figures 5 to 8 As shown in some embodiments of the present application, the length of the support rod 43 along the axial direction of the support rod 43 is L, wherein L≥H*a / b, H is the thickness of the battery monomer 21 along the first direction X, a is the expansion ratio of the battery monomer 21 during the charging and discharging process, and b is the zero stiffness strain interval of the support rod 43.

[0104] Specifically, the thickness of the battery monomer 21 is H, and the expansion ratio of the battery monomer 21 during the charging and discharging process is a, so the expansion thickness of the battery monomer 21 during the charging and discharging process is H*a. The size of the zero stiffness region formed by the support rod 43 needs to exceed the expansion thickness of the battery monomer 21 to maintain the stable pressure of the battery monomer 21 within the expansion range. Assuming that the strain interval of the zero stiffness region of the elastic component 40 is b, the axial length of the support rod 43 is greater than or equal to H*a / b. The zero stiffness strain interval refers to the characteristic that the stiffness of the material or structure is close to zero within a certain deformation range, that is, the resistance of the structure to elastic deformation is extremely small within this interval.

[0105] The length of the support rod 43 can be calculated according to the thickness of the battery monomer 21, so that the elastic component 40 is provided with the support rod 43 with the corresponding length, and the elastic component 40 provides a buffer force for the battery monomer 21, thereby reducing the extrusion deformation of the battery monomer 21 and the uneven stress between the battery monomers 21.

[0106] In combination Figures 5 to 8 As shown in some embodiments of the present application, the support rod 43 includes a metal support rod.

[0107] Specifically, the support rod 43 includes a metal support rod, including a copper rod, a stainless steel rod or an alloy rod.

[0108] By setting the support rod 43 as a metal support rod, the metal support rod has good support and bending properties, so as to provide support for the battery monomer 21 and provide a zero stiffness region, thereby reducing the uneven stress between the battery monomers 21.

[0109] In combination Figures 5 to 8As shown, in some embodiments of the present application, the elastic assembly 40 further comprises an elastic member, which is clamped between the first plate body 41 and the second plate body 42.

[0110] Specifically, the elastic member can be compressed under external force and can restore the deformation by its elasticity after losing the external force. The elastic member is arranged between the first plate body 41 and the second plate body 42 and can surround the outer surface of the support rod 43.

[0111] By clamping the elastic member between the first plate body 41 and the second plate body 42, the resilience of the elastic assembly 40 can be improved, so that it can restore to the original state when it is no longer extruded and can provide a buffer force for the next extrusion.

[0112] In combination Figures 5 to 8 As shown, in some embodiments of the present application, the elastic member comprises at least one of silica gel and polyurethane.

[0113] Specifically, when the first plate body 41, the second plate body 42 and the support rod 43 are assembled and formed, the first plate body 41 and the second plate body 42 have part of the spacing space in addition to the plurality of support rods 43 arranged therebetween. The liquid silica gel or polyurethane can be filled into the spacing space between the first plate body 41 and the second plate body 42 and solidified and formed.

[0114] Silica gel and polyurethane respectively have good elastic recovery force, so as to facilitate the elastic assembly 40 to restore to the original state when it is not extruded, and silica gel and polyurethane are easy to be filled between the first plate body 41 and the second plate body 42, facilitating the overall formation of the elastic assembly 40.

[0115] In combination Figures 5 to 8 As shown, in some embodiments of the present application, the battery device 10 comprises a plurality of battery monomers 21 arranged at intervals along the first direction X, and at least two adjacent battery monomers 21 are clamped with the elastic assembly 40.

[0116] Specifically, the plurality of battery monomers 21 are arranged at intervals in the accommodating cavity of the box body 30 along the first direction X, and one elastic assembly 40 is arranged between any two adjacent battery monomers 21 along the first direction X. Among them, the first plate body 41 of the elastic assembly 40 is attached to one of the battery monomers 21, and the second plate body 42 of the elastic assembly 40 is attached to the other of the battery monomers 21.

[0117] By clamping the elastic assembly 40 between at least two adjacent battery monomers 21, the elastic assembly 40 can provide a buffer force for the battery monomers 21 on both sides respectively, and can provide a zero stiffness area in the deformation process of the elastic assembly 40, thereby reducing the extrusion deformation and uneven stress of the battery monomers 21 on both sides.

[0118] In combination Figures 5 to 8As shown, in some embodiments of the present application, at least one of the battery monomers 21 at the two ends is clamped between the inner side wall of the box 30 and the elastic assembly along the first direction X.

[0119] Specifically, the box 30 includes a first side plate 31 and a second side plate 32 oppositely arranged along the first direction X, and the first side plate 31 and the second side plate 32 are respectively provided with inner side walls facing each other. At least one of the first side plate 31 and the second side plate 32 is clamped between the battery monomer 21 and the elastic assembly 40. Optionally, the battery monomers 21 at the two ends of the plurality of battery monomers 21 are respectively clamped between the first side plate 31 and the second side plate 32 and the elastic assembly 40 along the first direction X.

[0120] By clamping the elastic assembly 40 between at least one of the battery monomers 21 at the two ends and the inner side wall of the box 30, the elastic assembly 40 can provide a buffer force for at least one battery monomer 21 close to the inner side wall of the box 30, and provide a zero stiffness region during the deformation of the elastic assembly 40, thereby reducing the extrusion deformation of the battery monomer 21 at least at one end.

[0121] In combination Figures 4 to 8 As shown, in some embodiments of the present application, the elastic assembly 40 is in a compressed state inside the box 30.

[0122] Specifically, in the natural state, i.e. the state without stretching or compression, the size of the elastic assembly 40 along the first direction X is greater than the interval size between the adjacent two battery monomers 21, so that when the elastic assembly 40 and the battery monomer 21 are jointly installed inside the box 30, the elastic assembly 40 is clamped between the adjacent two battery monomers 21 in a compressed state, or the elastic assembly 40 is clamped between the two battery monomers 21 and the inner side wall of the box 30 in a compressed state.

[0123] By arranging the elastic assembly 40 in a compressed state inside the box 30, i.e. providing a pre-tightening force through the elastic assembly 40 before the deformation of the battery monomer 21 and extruding the battery monomer 21 along the first direction X, the adhesion between the electrolyte and the electrode in the battery monomer 21 is promoted, the interface impedance is reduced, and the electrochemical performance of the battery monomer 21 is improved.

[0124] In combination Figure 1 As shown, in some embodiments of the present application, the battery monomer 21 includes a first surface 2121 with the largest area, the first surface 2121 intersects the first direction X, and the first plate body 41 or the second plate body 42 is in contact with the first surface 2121 of the battery monomer 21.

[0125] Specifically, the battery cell 21 has a plurality of surfaces. Among them, the surface with the largest area is the first surface 2121. The first surface 2121 intersects the first direction X, so that the first plate body 41 or the second plate body 42 is attached to the first surface 2121 along the first direction X. Optionally, the first surface 2121 is perpendicular to the first direction X. Optionally, the battery cell 21 is a cuboid battery cell, and the battery cell 21 includes two first surfaces 2121 disposed on opposite sides along the first direction X, and the two first surfaces 2121 are respectively perpendicular to the first direction X. The two first surfaces 2121 are respectively attached to one elastic assembly 40.

[0126] By attaching the first plate body 41 or the second plate body 42 to the first surface 2121, the buffering force provided by the elastic assembly 40 can act on the first surface 2121, so that compared with the buffering force acting on other surfaces of the battery cell 21, the buffering force of the elastic assembly 40 can be dispersed, thereby reducing the deformation of the battery cell 21.

[0127] As shown in FIG. 1, Figure 1 The second aspect of the present application provides a power consuming device, which includes the battery device 10 of any one of the above.

[0128] Since the power consuming 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.

[0129] As shown in FIG. 1, Figure 2 In some embodiments of the present application, the power consuming device can be a vehicle 1, and the vehicle 1 includes the battery device 10 of any one of the above embodiments, which is used to provide electric energy for the vehicle 1 and drive the vehicle 1 to walk.

[0130] The above description is only a summary of the technical solutions 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, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described.

[0131] In combination with Figures 4 to 7 , ​As shown, in some embodiments of the present application, the battery device 10 comprises a box body 30, at least one battery cell 21 and at least one elastic assembly 40, the box body 30 is internally formed with a receiving cavity, the battery cell 21 is arranged in the receiving cavity, the elastic assembly 40 is arranged in the receiving cavity and at least one side of the battery cell 21 along a first direction X, the elastic assembly 40 comprises a first plate body 41 and a second plate body 42 oppositely arranged along the first direction X, one of the first plate body 41 or the second plate body 42 is fitted with at least one surface of the battery cell 21, the elastic assembly 40 further comprises a plurality of support rods 43 arranged between the first plate body 41 and the second plate body 42, one end of the support rod 43 along the first direction X is connected with one of the first plate body 41 and the second plate body 42, the other end of the support rod 43 along the first direction X is connected with or abuts against the other one of the first plate body 41 and the second plate body 42, the support rod 43 is configured to have a yield state in a state of being extruded, and the support rod 43 in the yield state has a zero stiffness region.

[0132] Optionally, the two ends of the plurality of support rods 43 along the first direction X are fixedly connected with the first plate body 41 and the second plate body 42 respectively.

[0133] Optionally, the slenderness ratio of the support rod 43 is , wherein, is a coefficient, . is the length dimension of the support rod 43 along the axial direction thereof, is the radius of gyration dimension of the support rod 43, wherein, , π is the circular constant, is the yield strength of the material forming the support rod 43, and E is the elastic modulus of the material forming the support rod 43.

[0134] Optionally, wherein, I is the sectional moment of inertia. The cross-sectional area of the support rod 43 along the direction perpendicular to the axial direction thereof is circular, and the diameter dimension of the cross-section is d, and the sectional moment of inertia , A is the cross-sectional dimension of the support rod 43 along the direction perpendicular to the axial direction thereof.

[0135] Optionally, L≥H*a / b, wherein H is the thickness dimension of the battery cell 21 along the first direction X, a is the expansion ratio of the battery cell 21 during the charging and discharging process of the battery cell 21, and b is the zero stiffness strain interval of the support rod 43.

[0136] Optionally, the support rod 43 comprises a metal support rod.

[0137] Optionally, the elastic assembly 40 further comprises an elastic piece, and the elastic piece is clamped between the first plate body 41 and the second plate body 42.

[0138] Optionally, the elastic element includes at least one of silicone and polyurethane.

[0139] Optionally, the battery device 10 includes a plurality of battery cells 21 spaced apart along a first direction X, with an elastic component 40 sandwiched between at least two adjacent battery cells 21.

[0140] Optionally, along the first direction, at least one of the battery cells 21 located at the beginning and end is provided with an elastic component 40 between it and the inner sidewall of the housing 30.

[0141] Optionally, the elastic component 40 is located inside the housing 30 in a compressed state.

[0142] Optionally, the battery cell 21 includes a first surface 2121 with the largest area, the first surface 2121 intersects the first direction X, and the first plate 41 or the second plate 42 is attached to the first surface 2121 of the battery cell 21.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: The box has an internal cavity for receiving; At least one battery cell, the battery cell being disposed within the receiving cavity; At least one elastic component is disposed within the receiving cavity and along a first direction on at least one side of the battery cell. The elastic component includes a first plate and a second plate disposed opposite each other along the first direction. The first plate or the second plate is in contact with at least one surface of the battery cell. The elastic component also includes a plurality of support rods disposed between the first plate and the second plate. One end of each support rod along the first direction is connected to one of the first plate and the second plate, and the other end of each support rod along the first direction is connected to or abuts against the other of the first plate and the second plate. The support rod is configured to have a yielding state under compression, and the support rod in the yielding state has a zero stiffness region. At least one end of the support rod is connected to the first plate or the second plate by a fixed connection or hinge, and the support rod has a slenderness ratio. , ,in, It is a coefficient, when one end of the support rod is free and the other end is fixedly connected. When one end of the support rod is hinged and the other end is fixed, When both ends of the support rod are fixed, When the two ends of the support rod are hinged, , The length of the support rod along its own axial direction is [missing information]. Let be the radius of rotation of the support rod, where π is the mathematical constant of a circle. E represents the yield strength of the material forming the support rod, and E represents the elastic modulus of the material forming the support rod.

2. The battery device according to claim 1, characterized in that, The multiple support rods are connected to the first plate and the second plate at their two ends along the first direction, respectively.

3. The battery device according to claim 1, characterized in that, A portion of the multiple support rods are connected to the first plate and the second plate at both ends along the first direction, and another portion of the multiple support rods are connected to the first plate or the second plate.

4. The battery device according to claim 1, characterized in that, The support rod includes a metal support rod.

5. The battery device according to claim 1, characterized in that, The elastic component further includes an elastic element, which is sandwiched between the first plate and the second plate.

6. The battery device according to claim 5, characterized in that, The elastic element includes at least one of silicone and polyurethane.

7. The battery device according to any one of claims 1 to 6, characterized in that, The battery device includes a plurality of battery cells spaced apart along the first direction, with the elastic component sandwiched between at least two adjacent battery cells.

8. The battery device according to claim 7, characterized in that, Along the first direction, at least one of the battery cells located at the beginning and end ends is sandwiched between the elastic component and the inner sidewall of the housing.

9. The battery device according to any one of claims 1 to 6, characterized in that, The elastic component is located inside the housing in a compressed state.

10. The battery device according to any one of claims 1 to 6, characterized in that, The battery cell includes a first surface with the largest area, the first surface intersects the first direction, and the first plate or the second plate is attached to the first surface of the battery cell.

11. An electrical appliance, characterized in that, A battery device having any one of claims 1 to 10.

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