Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, the battery device comprises a box body and a battery monomer, and the battery monomer is accommodated in the box body. The box body comprises a first wall, the first wall comprises a first part and a second part which are adjacent to each other, the thickness of the first part is larger than that of the second part, the first part comprises a first sub-part and a second sub-part which are adjacent to each other, the thickness of the first sub-part is larger than that of the second sub-part, and the first sub-part, the second sub-part and the second part all comprise fiber fabrics and adhesives. The fiber fabric is stacked in the thickness direction of the first wall, and the adhesive is connected with the fiber fabric. According to the battery device provided by the invention, the structural strength of the first wall is further improved, and the fatigue resistance of the first wall is improved.

Description

Technical Field

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

[0002] Battery devices are widely used in electronic devices, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

[0003] In the development of battery device technology, in addition to improving the performance of battery devices, the reliability of battery devices is also an issue that needs to be considered. Therefore, how to improve the reliability of battery devices is an issue of continuous improvement in battery technology. Utility Model Content

[0004] The present application provides a battery device and an electrical device to improve the reliability of the battery device.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, the battery device provided by the embodiment of the present application includes a box body and a battery cell, wherein the battery cell is contained in the box body. The box body includes a first wall, wherein the first wall includes a first part and a second part adjacent to each other, wherein the thickness of the first part is greater than the thickness of the second part, wherein the first part includes a first sub-part and a second sub-part adjacent to each other, wherein the thickness of the first sub-part is greater than the thickness of the second sub-part, wherein the first sub-part, the second sub-part and the second part all include fiber fabrics and an adhesive, wherein the fiber fabrics are stacked along the thickness direction of the first wall, and the adhesive connects the fiber fabrics.

[0007] The battery device provided in the embodiment of the present application is configured such that the first wall includes a first portion and a second portion, the thickness of the first portion is greater than the thickness of the second portion, the first portion includes a first sub-portion and a second sub-portion, the thickness of the first sub-portion is greater than the thickness of the second sub-portion, which is beneficial to improving the structural strength of the first wall and reducing the risk of deformation of the first wall such as outward bulging, and the first sub-portion, the second sub-portion and the second portion all include fiber fabrics and adhesives, which is beneficial to further improving the structural strength of the first wall and improving the fatigue resistance of the first wall.

[0008] According to some embodiments of the present application, the first portion and the second portion are integrally formed, and / or the first sub-portion and the second sub-portion are integrally formed.

[0009] In the above solution, the first part and the second part are integrally formed, which is conducive to improving the connection strength between the first part and the second part, thereby improving the structural strength of the first wall. The first sub-part and the second sub-part are integrally formed, which is conducive to improving the structural strength of the first part, thereby improving the structural strength of the first wall.

[0010] According to some embodiments of the present application, the number of fiber fabric layers in the first subsection is greater than that in the second subsection, and the number of fiber fabric layers in the second subsection is greater than that in the second section.

[0011] In the above scheme, the thickness of the first sub-section, the second sub-section and the second section is changed by using different numbers of layers of fiber fabrics of the first sub-section, the second sub-section and the second section, which is beneficial to further improve the structural strength of the first wall, such as torsional strength and fatigue resistance.

[0012] According to some embodiments of the present application, the number n1 of layers of the fiber fabric in the second part satisfies: 1≤n1≤4.

[0013] In the above solution, setting 1≤n1≤4 not only makes the second part have a certain structural strength, but also helps to reduce the weight of the second part, thereby facilitating lightweighting of the box body.

[0014] According to some embodiments of the present application, the number n2 of fiber fabric layers in the second sub-section satisfies: 2≤n2≤8.

[0015] In the above solution, setting 2≤n2≤8 not only makes the second sub-section have a higher structural strength, but also helps to reduce the weight of the second sub-section, thereby facilitating lightweighting of the box body.

[0016] According to some embodiments of the present application, the number n3 of fiber fabric layers in the first sub-section satisfies: 3≤n3≤12.

[0017] In the above solution, setting 3≤n2≤12 not only makes the first sub-section have a higher structural strength, but also helps to reduce the total amount of the first sub-section, thereby facilitating lightweighting of the box body.

[0018] According to some embodiments of the present application, the fiber fabric includes a first fabric layer, a second fabric layer and a third fabric layer, the first fabric layer is arranged in the area where the first sub-section, the second sub-section and the second section are located, the second fabric layer is only arranged in the area where the first sub-section and the second sub-section are located, the third fabric layer is only arranged in the area where the first sub-section is located, and the third fabric layer is arranged between the first fabric layer and the second fabric layer.

[0019] In the above scheme, it is helpful to reduce the risk of peeling of the third fabric layer from the first fabric layer or the second fabric layer, which is helpful to further improve the structural strength of the first sub-section, and then to improve the structural strength of the first wall, and reduce the risk of deformation such as bulging of the first wall.

[0020] According to some embodiments of the present application, the first wall is recessed inward from the edge of the first wall toward the accommodating cavity of the box body.

[0021] In the above solution, the risk of the battery device bulging outwards under the action of the torsional load is reduced by pre-deforming the first wall.

[0022] According to some embodiments of the present application, the first wall has a first surface facing away from the accommodating cavity, and in a plane parallel to the thickness direction of the first wall, a maximum dimension h of an orthographic projection of the first surface along the thickness direction satisfies: 1mm≤h≤10mm.

[0023] In the above solution, setting 1mm≤h≤10mm is beneficial to reducing the risk of the first wall bulging outwards and improving the energy density of the battery device.

[0024] According to some embodiments of the present application, a thickness e of the second portion satisfies: 0.5 mm ≤ e ≤ 3 mm.

[0025] In the above solution, setting 0.5 mm ≤ e ≤ 3 mm is beneficial to improving the structural strength of the first wall while also improving the energy density of the battery device.

[0026] According to some embodiments of the present application, the first sub-portion is in a strip shape.

[0027] In the above solution, the first sub-portion is arranged in a strip shape, which is beneficial to improving the torsional strength of the first wall and further beneficial to reducing the risk of deformation such as bulging of the first wall.

[0028] According to some embodiments of the present application, the first portion includes a plurality of first sub-portions, at least some of which extend a first preset distance along a first direction and are spaced apart along a second direction, and the first direction and the second direction intersect.

[0029] In the above solution, the structural strength of multiple locations corresponding to the first wall and the first sub-portion is strengthened, which is beneficial to further improve the structural strength of the first wall and further reduce the risk of deformation such as twisting and bulging of the first wall.

[0030] According to some embodiments of the present application, a dimension of the first wall along the first direction is greater than a dimension of the first wall along the second direction.

[0031] In the above solution, the first sub-portion is longer in the first direction, which is beneficial to reduce the risk of the first wall twisting around the diagonal direction, and further beneficial to reduce the risk of the first wall being deformed such as twisting and bulging.

[0032] According to some embodiments of the present application, a portion of the plurality of first sub-portions extends a first preset distance along the first direction and is spaced apart along the second direction, and another portion extends a second preset distance along the second direction and is spaced apart along the first direction.

[0033] In the above scheme, a part of the first sub-portion extends along the first direction, and the other part extends along the second direction. The structural strength of the first wall is strengthened along the first direction and the second direction, which is beneficial to further improve the structural strength of the first wall and further help reduce the risk of deformation such as twisting or bulging of the first wall.

[0034] According to some embodiments of the present application, the orthographic projection of the first sub-portion on a plane perpendicular to the thickness direction is in a mesh shape.

[0035] In the above solution, the first sub-parts are arranged in a mesh shape on the first wall, which is beneficial to improving the structural strength of the first wall, thereby improving the torsional strength of the first wall and reducing the risk of deformation such as torsion or bulging of the first wall.

[0036] According to some embodiments of the present application, the box body further includes two second walls, which are arranged on two opposite sides of the first wall, and the second walls are integrally formed with the first wall and are bent relative to the first wall.

[0037] In the above solution, the first wall and the second wall are integrally formed and are in a "U" shape, which is beneficial to improving the overall structural strength of the first wall and the second wall, and further beneficial to improving the structural strength of the first wall.

[0038] In a second aspect, the electrical device provided in the embodiments of the present application includes the battery device provided in any of the above embodiments, and the battery device is used to provide electrical energy.

[0039] The electric device provided in the embodiment of the present application has the same technical effect as the battery device provided in any of the above embodiments, and thus will not be described in detail here.

[0040] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0043] Figure 2 A schematic diagram of the structure of a battery device provided in an embodiment of the present application;

[0044] Figure 3A schematic diagram of the structure of a battery module in a battery device provided in an embodiment of the present application;

[0045] Figure 4 A schematic diagram of the explosion structure of a battery cell in a battery device provided in an embodiment of the present application;

[0046] Figure 5 A front view of a partial structure of a box in a battery device provided in an embodiment of the present application;

[0047] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure along AA;

[0048] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0049] Figure 8 for Figure 6 A partial enlarged view of point C in the middle;

[0050] Fig. 9 A schematic diagram of a portion of the structure of a box in a battery device provided in an embodiment of the present application.

[0051] In the drawings, the figures are not necessarily drawn to scale.

[0052] Description of reference numerals:

[0053] 1- Vehicle;

[0054] 10-battery device; 11-box; 111-first sub-box; 112-second sub-box; 113-first wall; 1131-first part; 1131a-first sub-part; 1131b-second sub-part; 1132-second part; 114-second wall; 1a-motor; 1b-controller;

[0055] 20-battery module;

[0056] 30 - battery cell; 31 - shell; 311 - housing; 312 - end cap; 32 - electrode assembly; 321 - electrode body; 322 - pole ear; 33 - electrode terminal;

[0057] X-thickness direction. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0059] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0060] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0061] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0063] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0064] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0065] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly 30 may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0066] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0067] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0068] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0069] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0070] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0071] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0072] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0073] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0074] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0075] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0076] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium with surface silver plating may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for battery cells may also be used.

[0078] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0079] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium may be used.

[0080] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0081] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0082] In some embodiments, the diaphragm is an isolation membrane. The present application has no particular limitation on the type of isolation membrane, and any known isolation membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0083] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0084] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0085] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0086] In some embodiments, the electrode assembly is a laminate structure.

[0087] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0088] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0089] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collector. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0090] In some embodiments, an explosion-proof valve is provided on the housing, and the explosion-proof valve is used to release the internal pressure of the battery cell.

[0091] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal prismatic battery, such as a hexagonal prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0092] When the battery device is used in an electrical device such as a vehicle, the mounting surface of the battery device of the vehicle has a certain flatness error due to the flatness error of the structure such as the bracket for carrying the battery device of the vehicle. Therefore, the four corner areas of the bearing surface on the vehicle for carrying the battery are not always on the same horizontal plane. Therefore, after the battery device is installed in the vehicle or other electrical device, the locking force between the battery device box and the bracket may easily cause the box to deform, bulge, etc., which may easily cause the problem of low strength of the box structure, seriously affecting the reliability of the battery device.

[0093] In view of this, an embodiment of the present application provides a battery device including a box body and a battery cell, wherein the battery cell is accommodated in the box body. The box body includes a first wall, the first wall includes a first part and a second part adjacent to each other, the thickness of the first part is greater than the thickness of the second part, the first part includes a first sub-part and a second sub-part adjacent to each other, the thickness of the first sub-part is greater than the thickness of the second sub-part, the first sub-part, the second sub-part and the second part all include fiber fabrics and adhesives, the fiber fabrics are stacked along the thickness direction of the first wall, and the adhesive connects the fiber fabrics.

[0094] The battery device provided in the present application is configured such that the first wall includes a first portion and a second portion, the thickness of the first portion is greater than the thickness of the second portion, the first portion includes a first sub-portion and a second sub-portion, the thickness of the first sub-portion is greater than the thickness of the second sub-portion, which is beneficial to improving the structural strength of the first wall and reducing the risk of deformation of the first wall such as outward bulging, and the first sub-portion, the second sub-portion and the second portion all include fiber fabrics and adhesives, which are beneficial to further improving the structural strength of the first wall and improving the fatigue resistance of the first wall.

[0095] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0096] The battery device disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft. The battery device disclosed in the present application can be used to form a power supply system of the electrical device.

[0097] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0098] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0099] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1 provided in an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is provided inside the vehicle 1, and the battery device 10 may be provided at the bottom, head or tail of the vehicle 1. The battery device 10 may be used to power the vehicle 1, for example, the battery device 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1.

[0100] The vehicle 1 may further include a controller 1b and a motor 1a, wherein the controller 1b is used to control the battery device 10 to supply power to the motor 1a, for example, to meet the power requirements of starting, navigating, and driving the vehicle 1.

[0101] In some embodiments of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0102] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in an embodiment of the present application. Figure 3 Schematic diagram of the structure of the battery module 20 in the battery device 10 provided in an embodiment of the present application. The battery device 10 includes a box 11 and a battery cell 30, and the battery cell 30 is accommodated in the box 11. Among them, the box 11 is used to provide a storage space for the battery cell 30, and the box 11 can adopt a variety of structures. In some embodiments, the box 11 may include a first sub-box 111 and a second sub-box 112, the first sub-box 111 and the second sub-box 112 cover each other, and the first sub-box 111 and the second sub-box 112 jointly define a storage space for accommodating the battery cell 30. The second sub-box 112 may be a hollow structure with one end open, and the first sub-box 111 may be a plate-like structure, and the first sub-box 111 covers the open side of the second sub-box 112, so that the first sub-box 111 and the second sub-box 112 jointly define a storage space; the first sub-box 111 and the second sub-box 112 may also be hollow structures both with one side open, and the open side of the first sub-box 111 covers the open side of the second sub-box 112.

[0103] In the battery device 10, there may be multiple battery cells 30, and the multiple battery cells 30 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 30 are both connected in series and in parallel. The multiple battery cells 30 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 30 is accommodated in the box 11; of course, the battery device 10 may also be a battery module 20 in the form of multiple battery cells 30 connected in series, in parallel, or in a mixed connection, and then the multiple battery modules 20 are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 11. The battery device 10 may also include other structures, for example, the battery device 10 may also include a busbar component for realizing electrical connection between the multiple battery cells 30.

[0104] The battery cell 30 may be a secondary battery or a primary battery; the battery cell 30 may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0105] Please refer to Figure 4 , Figure 4 Schematic diagram of the explosion structure of the battery cell 30 provided in the embodiment of the present application. Figure 4 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32 and an electrode terminal 33. The housing 31 includes a shell 311 and an end cap 312. The shell 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0106] The shell 311 is a component used to cooperate with the end cap 312 to form the internal environment of the battery cell 30, wherein the formed internal environment can be used to accommodate the electrode assembly 32, the electrolyte and other components. The shell 311 and the end cap 312 can be independent components. The shell 311 can be of various shapes and sizes. Specifically, the shape of the shell 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the shell 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0107] The end cap 312 refers to a component that covers the opening of the shell 311 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cap 312 can be adapted to the shape of the shell 311 to match the shell 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 312 is not easily deformed when squeezed and collided, so that the battery cell 30 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals 33 can be provided on the end cap 312. The electrode terminal 33 can be used to electrically connect to the electrode assembly 32 for outputting or inputting electrical energy of the battery cell 30. The material of the end cap 312 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap 312, and the insulating structure may be used to isolate the electrical connection components in the housing 311 from the end cap 312 to reduce the risk of short circuit. For example, the insulating structure may be plastic, rubber, or the like.

[0108] The electrode assembly 32 is a component in the battery cell 30 where an electrochemical reaction occurs. One or more electrode assemblies 32 may be included in the housing 311. The electrode assembly 32 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet, and the separator is used to separate the positive electrode sheet and the negative electrode sheet to avoid short circuit between the positive electrode sheet and the negative electrode sheet. The part of the positive electrode sheet and the negative electrode sheet with active material constitutes the electrode body 321 of the electrode assembly 32, and the part of the positive electrode sheet and the negative electrode sheet without active material each constitutes the pole ear 322. The positive pole ear 322 and the negative pole ear 322 may be located together at one end of the electrode body 321 or at both ends of the electrode body 321 respectively. During the charge and discharge process of the battery cell 30, the positive electrode active material and the negative electrode active material react with the electrolyte, and the pole ear 322 connects the electrode terminal 33 to form a current loop.

[0109] First, as Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the battery device 10 provided in the embodiment of the present application includes a box body 11 and a battery cell 30, and the battery cell 30 is accommodated in the box body 11. The box body 11 includes a first wall 113, and the first wall 113 includes a first part 1131 and a second part 1132 adjacent to each other, the thickness of the first part 1131 is greater than the thickness of the second part 1132, the first part 1131 includes a first sub-part 1131a and a second sub-part 1131b adjacent to each other, the thickness of the first sub-part 1131a is greater than the thickness of the second sub-part 1131b, the first sub-part 1131a, the second sub-part 1131b and the second part 1132 all include fiber fabrics and adhesives, the fiber fabrics are stacked along the thickness direction X of the first wall 113, and the adhesive connects the fiber fabrics.

[0110] The box body 11 includes a first wall 113 . Optionally, the box body 11 may include one, two or more first walls 113 .

[0111] Optionally, the first wall 113 may be at least a part of the first sub-box 111 of the box 11 , or the first wall 113 may be at least a part of the second sub-box 112 of the box 11 .

[0112] The thickness of the first portion 1131 is greater than the thickness of the second portion 1132. The first portion 1131 includes a first sub-portion 1131a and a second sub-portion 1131b adjacent to each other, and the thickness of the first sub-portion 1131a and the second sub-portion 1131b are both greater than the thickness of the second portion 1132. The first portion 1131 and the second portion 1132 may be integrally formed, or the first portion 1131 and the second portion 1132 may be formed separately and then connected together.

[0113] The first sub-portion 1131a and the second sub-portion 1131b are adjacent to each other. Optionally, the first sub-portion 1131a and the second sub-portion 1131b may be integrally formed, or they may be formed separately and then connected together.

[0114] The first portion 1131 may be distributed on the first wall 113 in a strip shape, a mesh shape, or other shapes.

[0115] The first sub-section 1131a, the second sub-section 1131b and the second section 1132 all include fiber fabrics and adhesives, and the first sub-section 1131a, the second sub-section 1131b and the second section 1132 can be formed by pultrusion or molding. Specifically, fiber fabrics such as glass fiber fabrics or carbon fiber fabrics can be placed in a molding mold, and then resin or other adhesives can be poured into the mold, and then the fiber fabrics and the adhesive are cured under pressure. The fiber fabrics and the adhesive can be cured at room temperature or cured under heating conditions.

[0116] Of course, the fiber fabric may be pre-impregnated with an adhesive, and the fiber fabric and the adhesive may be placed in a molding die, and then the fiber fabric and the adhesive may be pressurized and cured. Therefore, the adhesive connecting the fiber fabric may be a connection formed during the curing process of the adhesive and the fiber fabric.

[0117] Since the first sub-portion 1131a, the second sub-portion 1131b and the second portion 1132 all include fiber fabrics and adhesives, the first sub-portion 1131a, the second sub-portion 1131b and the second portion 1132 all have relatively high structural strength, such as fatigue resistance and bending resistance.

[0118] Since the thickness of the first portion 1131 is greater than that of the second portion 1132, the structural strength of the first portion 1131 is greater than that of the second portion 1132. Since the thickness of the first sub-portion 1131a is greater than that of the second sub-portion 1131b, the structural strength of the first sub-portion 1131a is greater than that of the second sub-portion 1131b.

[0119] By setting the thickness of the first portion 1131 to be greater than the thickness of the second portion 1132, the first wall 113 and the region corresponding to the first portion 1131 can be structurally reinforced to increase the overall structural strength of the first wall 113. When the installation surface of the battery device 10 is uneven, the box body 11 of the battery device 10 can withstand a certain torsional load to reduce the risk of distortion, deformation or bulging of the box body 11.

[0120] The battery device 10 provided in the present application is configured such that the first wall 113 includes a first portion 1131 and a second portion 1132, the thickness of the first portion 1131 is greater than the thickness of the second portion 1132, the first portion 1131 includes a first sub-portion 1131a and a second sub-portion 1131b, the thickness of the first sub-portion 1131a is greater than the thickness of the second sub-portion 1131b, which is beneficial to improving the structural strength of the first wall 113 and reducing the risk of deformation of the first wall 113 such as outward bulging, and the first sub-portion 1131a, the second sub-portion 1131b and the second portion 1132 all include fiber fabrics and adhesives, which are beneficial to further improving the structural strength of the first wall 113 and improving the fatigue resistance of the first wall 113.

[0121] In some embodiments, Figure 6 , Figure 7 and Figure 8 As shown, the first portion 1131 and the second portion 1132 are integrally formed, and / or the first sub-portion 1131a and the second sub-portion 1131b are integrally formed.

[0122] During the molding process, the fiber fabrics corresponding to the first portion 1131 and the second portion 1132 may be continuous and integrally molded.

[0123] Similarly, the fiber fabrics corresponding to the first sub-portion 1131a and the second sub-portion 1131b may also be continuous and integrally formed through a molding process.

[0124] The first portion 1131 and the second portion 1132 are integrally formed, which is beneficial to improving the connection strength between the first portion 1131 and the second portion 1132, thereby improving the structural strength of the first wall 113. The first sub-portion 1131a and the second sub-portion 1131b are integrally formed, which is beneficial to improving the structural strength of the first portion 1131, thereby improving the structural strength of the first wall 113.

[0125] In some embodiments, the number of fiber fabric layers in the first subsection 1131 a is greater than the number of fiber fabric layers in the second subsection 1131 b , and the number of fiber fabric layers in the second subsection 1131 b is greater than the number of fiber fabric layers in the second section 1132 .

[0126] The number of layers of the fiber fabric in the first sub-section 1131a is greater than the number of layers of the fiber fabric in the second sub-section 1131b, and the thickness of the fiber fabric and the adhesive in the first sub-section 1131a is greater than the thickness of the fiber fabric and the adhesive in the second sub-section 1131b. Similarly, the thickness of the fiber fabric and the adhesive in the first section 1131 is greater than the thickness of the fiber fabric and the adhesive in the second section 1132.

[0127] In this way, by using different numbers of layers of fiber fabrics of the first sub-portion 1131a, the second sub-portion 1131b and the second portion 1132, the thickness of the first sub-portion 1131a, the second sub-portion 1131b and the second portion 1132 can be changed, which is beneficial to further improve the structural strength of the first wall 113, such as torsional strength and fatigue strength.

[0128] In some embodiments, the number n1 of the fiber fabric layers in the second portion 1132 satisfies: 1≤n1≤4.

[0129] Optionally, n1 may be 1, 2, 3 or 4, etc.

[0130] In this way, the formed second portion 1132 has a certain structural strength and is helpful to reduce the weight of the second portion 1132 .

[0131] Therefore, after systematic analysis and long-term practice, the inventors found that setting 1≤n1≤4 not only ensures that the second part 1132 has a certain structural strength, but also helps to reduce the weight of the second part 1132, thereby facilitating lightweighting of the box body 11.

[0132] In some embodiments, the number n2 of fiber fabric layers in the second sub-section 1131 b satisfies: 2≤n2≤8.

[0133] Optionally, n2 can be 2, 3, 4, 5, 6, 7 or 8, etc.

[0134] After systematic analysis and long-term practice, the inventors found that setting 2≤n2≤8 not only makes the second sub-section 1131b have a higher structural strength, but also helps to reduce the weight of the second sub-section 1131b, thereby facilitating lightweighting of the box body 11.

[0135] In some embodiments, the number n3 of the fiber fabric layers in the first sub-portion 1131 a satisfies: 3≤n3≤12.

[0136] Optionally, n3 can be 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12, etc.

[0137] After systematic analysis and long-term practice, the inventors found that setting 3≤n2≤12 not only makes the first sub-section 1131a have a higher structural strength, but also helps to reduce the total amount of the first sub-section 1131a, thereby facilitating lightweighting of the box body 11.

[0138] In some embodiments, the fiber fabric includes a first fabric layer, a second fabric layer and a third fabric layer. The first fabric layer is arranged in the area where the first sub-portion 1131a, the second sub-portion 1131b and the second portion 1132 are located, the second fabric layer is only arranged in the area where the first sub-portion 1131a and the second sub-portion 1131b are located, the third fabric layer is only arranged in the area where the first sub-portion 1131a is located, and the third fabric layer is arranged between the first fabric layer and the second fabric layer.

[0139] In this way, during the molding process of the first wall 113, the first fabric layer is arranged in the areas corresponding to the first sub-portion 1131a, the second sub-portion 1131b and the second portion 1132, the second fabric layer is only arranged in the areas where the first sub-portion 1131a and the second sub-portion 1131b are located, and the third fabric layer is only arranged in the area corresponding to the first sub-portion 1131a, so that the thickness of the first sub-portion 1131a is greater than the thickness of the second sub-portion 1131b, and the thickness of the second sub-portion 1131b is greater than the thickness of the second portion 1132, and the first sub-portion 1131a, the second sub-portion 1131b and the second portion 1132 are molded as one piece.

[0140] The third fabric layer is arranged between the first fabric layer and the second fabric layer. The first fabric layer and the second fabric layer have a good covering effect on the third fabric layer, which is beneficial to reduce the risk of the third fabric layer peeling off from the first fabric layer or the second fabric layer, and is beneficial to further improve the structural strength of the first sub-section 1131a, and then it is beneficial to improve the structural strength of the first wall 113, and reduce the risk of deformation such as bulging of the first wall 113.

[0141] In some embodiments, the first wall 113 is recessed inward from the edge of the first wall 113 toward the receiving cavity of the box body 11 .

[0142] During the manufacturing process of the first wall 113 , the first wall 113 is pre-deformed in a direction of the accommodating cavity, thereby reducing the risk of the battery device 10 bulging outwards under the action of the torsional load.

[0143] In some embodiments, the first wall 113 has a first surface facing away from the accommodating cavity, and in a plane parallel to the thickness direction X of the first wall 113 , a maximum dimension h of an orthographic projection of the first surface along the thickness direction X satisfies: 1 mm ≤ h ≤ 10 mm.

[0144] The maximum dimension of the orthographic projection of the first surface in a plane parallel to the thickness direction X of the first wall 113 along the thickness direction X may be the maximum dimension of the first wall 113 recessed in a direction toward the accommodating cavity.

[0145] Optionally, h can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc.

[0146] After systematic analysis and long-term practice, the inventors found that setting 1 mm ≤ h ≤ 10 mm is beneficial to reducing the risk of the first wall 113 bulging outwards while also improving the energy density of the battery device 10 .

[0147] In some embodiments, Figure 6 and Figure 8 As shown, the thickness e of the second portion 1132 satisfies: 0.5 mm ≤ e ≤ 3 mm.

[0148] Optionally, e can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm, etc.

[0149] After systematic analysis and long-term practice, the inventors found that setting 0.5 mm ≤ e ≤ 3 mm is beneficial to improving the structural strength of the first wall 113 while also improving the energy density of the battery device 10 .

[0150] In some embodiments, the first sub-portion 1131 a is in a strip shape.

[0151] The first sub-portion 1131a is arranged in a strip shape. Optionally, the first sub-portion 1131a may extend along the length direction of the first wall 113, or the first sub-portion 1131a may extend along the width direction of the first wall 113, or part of the first sub-portion 1131a may extend along the length direction and another part may extend along the width direction.

[0152] Providing the first sub-portion 1131a in a strip shape is beneficial to improving the torsional strength of the first wall 113 , and further beneficial to reducing the risk of deformation such as bulging of the first wall 113 .

[0153] In some embodiments, the first portion 1131 includes a plurality of first sub-portions 1131 a , at least some of which extend a first preset distance along a first direction and are spaced apart along a second direction, and the first direction and the second direction intersect.

[0154] The plurality of first sub-portions 1131 a extend along a first direction and are spaced apart along a second direction, wherein the first direction and the second direction intersect, and illustratively, the first direction and the second direction are perpendicular to each other.

[0155] In this way, the structural strength of multiple locations of the first wall 113 corresponding to the first sub-portion 1131a is strengthened, which is beneficial to further improve the structural strength of the first wall 113 and further reduce the risk of deformation of the first wall 113 such as twisting and bulging.

[0156] In some embodiments, a dimension of the first wall 113 along the first direction is greater than a dimension of the first wall 113 along the second direction.

[0157] The dimension of the first wall 113 along the first direction is greater than the dimension of the first wall 113 along the second direction. Since the first sub-portion 1131a extends along the first direction, the dimension of the first sub-portion 1131a extending along the first direction is longer, which is beneficial to reducing the risk of twisting of the first wall 113 around the diagonal direction, and further helps to reduce the risk of deformation of the first wall 113 such as twisting and bulging.

[0158] In some embodiments, a portion of the plurality of first sub-portions 1131a extend a first preset distance along the first direction and are spaced apart along the second direction, and another portion extend a second preset distance along the second direction and are spaced apart along the first direction.

[0159] In this way, a part of the first sub-portion 1131a extends along the first direction, and the other part extends along the second direction. The structural strength of the first wall 113 is strengthened along the first direction and the second direction, which is beneficial to further improve the structural strength of the first wall 113, and further beneficial to reduce the risk of deformation of the first wall 113 such as twisting or bulging.

[0160] In some embodiments, the orthographic projection of the first sub-portion 1131 a on a plane perpendicular to the thickness direction X is in a mesh shape.

[0161] In this way, the first sub-portions 1131a are arranged in a mesh shape on the first wall 113, which is beneficial to improving the structural strength of the first wall 113, thereby improving the torsional strength of the first wall 113 and reducing the risk of deformation such as torsion or bulging of the first wall 113.

[0162] In some embodiments, Fig. 9 As shown, the box body 11 further includes two second walls 114 . The two second walls 114 are disposed on two opposite sides of the first wall 113 . The second walls 114 are integrally formed with the first wall 113 and are bent relative to the first wall 113 .

[0163] In this way, the first wall 113 and the second wall 114 are integrally formed and present a “U” shape, which is beneficial to improving the overall structural strength of the first wall 113 and the second wall 114 , and further beneficial to improving the structural strength of the first wall 113 .

[0164] In a second aspect, an electrical device provided according to an embodiment of the present application includes a battery device 10 provided in any of the above embodiments, and the battery device 10 is used to provide electrical energy.

[0165] The electric device provided in the embodiment has the same technical effect as the battery device 10 provided in any of the above embodiments, and thus will not be described in detail here.

[0166] In some embodiments, Figures 4 to 9As shown, the battery device 10 provided in the embodiment of the present application includes a battery cell 30 and a box body 11, wherein the battery cell 30 is accommodated in the box body 11, and the box body 11 includes a first wall 113 and two second walls 114, wherein the two second walls 114 are arranged on opposite sides of the first wall 113, and the second wall 114 is integrally formed with the first wall 113 and is bent relative to the first wall 113. The first wall 113 includes a first portion 1131 and a second portion 1132 adjacent to each other, wherein the thickness of the first portion 1131 is greater than the thickness of the second portion 1132, and the first portion 1131 includes a first sub-portion 1131a and a second sub-portion 1131b adjacent to each other, wherein the thickness of the first sub-portion 1131a is greater than the thickness of the second sub-portion 1131b, and the first sub-portion 1131a, the second sub-portion 1131b and the second portion 1132 all include fiber fabrics and adhesives, wherein the fiber fabrics are stacked along the thickness direction X of the first wall 113, and the adhesives connect the fiber fabrics. The first part 1131 and the second part 1132 are integrally formed, and the first sub-part 1131a and the second sub-part 1131b are integrally formed. The number of layers of fiber fabric in the first sub-part 1131a is greater than the number of layers of fiber fabric in the second sub-part 1131b, and the number of layers of fiber fabric in the second sub-part 1131b is greater than the number of layers of fiber fabric in the second part 1132. The number of layers of fiber fabric n1 in the second part 1132 satisfies: 1≤n1≤4, the number of layers of fiber fabric n2 in the second sub-part 1131b satisfies: 2≤n2≤8, and the number of layers of fiber fabric n3 in the first sub-part 1131a satisfies: 3≤n3≤12. The fiber fabric includes a first fabric layer, a second fabric layer and a third fabric layer. The first fabric layer is arranged in the area where the first sub-portion 1131a, the second sub-portion 1131b and the second portion 1132 are located. The second fabric layer is only arranged in the area where the first sub-portion 1131a and the second sub-portion 1131b are located. The third fabric layer is only arranged in the area where the first sub-portion 1131a is located. The third fabric layer is arranged between the first fabric layer and the second fabric layer. From the edge of the first wall 113 inward, the first wall 113 is recessed in the direction of the accommodating cavity of the box body 11. The first wall 113 has a first surface facing away from the accommodating cavity. In a plane parallel to the thickness direction X of the first wall 113, the maximum dimension h of the orthographic projection of the first surface along the thickness direction X satisfies: 1mm≤h≤10mm. The thickness e of the second portion 1132 satisfies: 0.5mm≤e≤3mm. The first sub-portion 1131a is strip-shaped. The first portion 1131 includes a plurality of first sub-portions 1131a, at least some of which extend a first preset distance along the first direction and are spaced apart along the second direction, the first direction and the second direction intersecting. The dimension of the first wall 113 along the first direction is greater than the dimension of the first wall 113 along the second direction.

[0167] The battery device 10 provided in the embodiment of the present application is configured such that the first wall 113 includes a first portion 1131 and a second portion 1132, the thickness of the first portion 1131 is greater than the thickness of the second portion 1132, the first portion 1131 includes a first sub-portion 1131a and a second sub-portion 1131b, the thickness of the first sub-portion 1131a is greater than the thickness of the second sub-portion 1131b, which is beneficial to improving the structural strength of the first wall 113 and reducing the risk of deformation of the first wall 113 such as outward bulging, and the first sub-portion 1131a, the second sub-portion 1131b and the second portion 1132 all include fiber fabrics and adhesives, which is beneficial to further improving the structural strength of the first wall 113 and improving the fatigue resistance of the first wall 113.

[0168] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A box body, the box body comprising a first wall, the first wall comprising a first portion and a second portion adjacent to each other, the thickness of the first portion being greater than the thickness of the second portion, the first portion comprising a first sub-portion and a second sub-portion adjacent to each other, the thickness of the first sub-portion being greater than the thickness of the second sub-portion, the first sub-portion, the second sub-portion and the second portion all comprising fiber fabrics and an adhesive, the fiber fabrics being stacked along a thickness direction of the first wall, and the adhesive connecting the fiber fabrics; The battery cell is accommodated in the box.

2. The battery device according to claim 1, characterized in that: The first portion and the second portion are integrally formed, and / or the first sub-portion and the second sub-portion are integrally formed.

3. The battery device according to claim 1, characterized in that: The number of layers of the fiber fabric in the first subsection is greater than that in the second subsection, and the number of layers of the fiber fabric in the second subsection is greater than that in the second section.

4. The battery device according to claim 3, characterized in that: The number of layers n1 of the fiber fabric in the second part satisfies: 1≤n1≤4; and / or, The number n2 of the fiber fabric layers in the second sub-section satisfies: 2≤n2≤8; and / or, The number n3 of the layers of the fiber fabric in the first subsection satisfies: 3≤n3≤12.

5. The battery device according to claim 1, characterized in that: The fiber fabric includes a first fabric layer, a second fabric layer and a third fabric layer, the first fabric layer is arranged in the area where the first sub-section, the second sub-section and the second section are located, the second fabric layer is only arranged in the area where the first sub-section and the second sub-section are located, the third fabric layer is only arranged in the area where the first sub-section is located, and the third fabric layer is arranged between the first fabric layer and the second fabric layer.

6. The battery device according to claim 1, characterized in that: From the edge of the first wall inward, the first wall is recessed toward the accommodating cavity of the box body.

7. The battery device according to claim 6, characterized in that: The first wall has a first surface facing away from the accommodating cavity, and in a plane parallel to the thickness direction of the first wall, a maximum dimension h of an orthographic projection of the first surface along the thickness direction satisfies: 1 mm ≤ h ≤ 10 mm.

8. The battery device according to claim 1, characterized in that: The thickness e of the second portion satisfies: 0.5 mm ≤ e ≤ 3 mm.

9. The battery device according to any one of claims 1 to 8, characterized in that: The first sub-portion is in a strip shape.

10. The battery device according to claim 9, characterized in that: The first portion includes a plurality of first sub-portions, at least some of the plurality of first sub-portions extend a first preset distance along a first direction and are spaced apart along a second direction, and the first direction and the second direction intersect.

11. The battery device according to claim 10, characterized in that: A dimension of the first wall along the first direction is greater than a dimension of the first wall along the second direction.

12. The battery device according to claim 10, characterized in that: A portion of the plurality of first sub-portions extends a first preset distance along the first direction and is spaced apart along the second direction, and another portion extends a second preset distance along the second direction and is spaced apart along the first direction.

13. The battery device according to any one of claims 1 to 8, characterized in that: The orthographic projection of the first sub-portion on a plane perpendicular to the thickness direction is in a mesh shape.

14. The battery device according to any one of claims 1 to 8, characterized in that: The box body further includes two second walls, which are arranged on two opposite sides of the first wall. The second wall is integrally formed with the first wall and is bent relative to the first wall.

15. An electrical device, characterized in that: The battery device comprises a battery device as claimed in any one of claims 1 to 14, wherein the battery device is used to provide electrical energy.

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