Battery devices and power-consuming devices

Abstract

The present application provides a battery device and an electrical device. The battery device includes a housing, a battery cell group, and a limiting member. The battery cell group is accommodated in the housing. The battery cell group includes a plurality of battery cells arranged along a first direction. A first gap is provided between two adjacent battery cells along the first direction. The battery cells are adhesively connected to the housing. The limiting member is connected to at least one side of the plurality of battery cells along a second direction to limit the relative displacement of two adjacent battery cells along the first direction. The first direction intersects with the second direction. The battery device provided by the present application is conducive to simplifying the assembly process of the battery device, simplifying the overall structure of the battery device, and improving the energy density of the battery device.

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, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes, and power 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 and simplify the overall structure of battery devices is an issue that needs to be continuously improved in battery device technology. Summary of the Invention

[0004] The present application provides a battery device and an electrical device, which are helpful in simplifying the structure of the battery device.

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

[0006] In a first aspect, the battery device provided in an embodiment of the present application includes a housing, a battery cell group, and a limiting member. The battery cell group is housed within the housing, and the battery cell group includes a plurality of battery cells arranged along a first direction, with a first gap defined between two adjacent battery cells along the first direction, and the battery cells are adhesively connected to the housing. The limiting member is connected to at least one side of the plurality of battery cells along a second direction to limit relative displacement of two adjacent battery cells along the first direction, where the first direction intersects the second direction.

[0007] The battery device provided in the embodiment of the present application provides a first gap between the battery cells to provide space for the expansion of the battery cells through the first gap, and limits the relative displacement of two adjacent battery cells along the first direction through a limiter, so that the first gap between adjacent battery cells is relatively stable. In this way, during the assembly of the battery device, the relative displacement between adjacent battery cells is limited by the limiter, so that adjacent battery cells have a stable first gap along the first direction, which facilitates the assembly of the battery device and can omit or simplify structures such as buffers between the battery cells. While reducing the risk of lithium deposition due to expansion of the battery cells, it is also beneficial to simplify the overall structure of the battery device and improve the energy density of the battery device.

[0008] According to some embodiments of the present application, the limiting member is adhesively connected to the battery cell.

[0009] In the above solution, the connection between the limiting member and the battery cell is convenient and reliable, which not only improves the reliability of the connection between the limiting member and the battery cell, but also facilitates the efficiency of battery device assembly.

[0010] According to some embodiments of the present application, limiting members are provided on both sides of at least one battery cell group along the second direction.

[0011] In the above scheme, limiting members are provided on both sides of at least one battery cell group along the second direction, which is beneficial to improving the stability of the limiting members on the battery cells, further reducing the risk of relative displacement of adjacent battery cells along the first direction, so that there is a sufficiently large first gap between the battery cells, which is beneficial to improving the reliability of the battery device.

[0012] According to some embodiments of the present application, the battery device includes multiple battery cell groups, at least part of which are arranged along the second direction, and battery cells of at least two adjacent battery cell groups along the second direction are connected to the same limiting member.

[0013] In the above solution, two adjacent battery cell groups share the same limiter, which is beneficial to reducing the number of limiters. While simplifying the overall structure of the battery device, the two adjacent battery cell groups are connected by the limiter, which is beneficial to improving the overall structural strength of the battery device.

[0014] According to some embodiments of the present application, the material of the limiting component includes polycarbonate.

[0015] In the above solution, it is beneficial to improve the structural strength of the limiting member, thereby improving the limiting effect of the limiting member on the battery cell, and is beneficial to improving the energy density of the battery device.

[0016] According to some embodiments of the present application, the battery cell includes two first surfaces opposite to each other along a first direction and two second surfaces opposite to each other along a second direction, the first surface connects the two second surfaces, and the area of ​​the first surface is greater than that of the second surface.

[0017] In the above scheme, during the cycle operation, the battery cell mainly expands in the normal direction of the first surface. Since there is a first gap between the first surfaces of two adjacent battery cells, the first gap can provide space for the expansion of the battery cell, which is conducive to further reducing the risk of lithium deposition due to the obstruction of expansion of the battery cell during the cycle operation.

[0018] According to some embodiments of the present application, a battery cell has a first wall along one side of a third direction, the first direction and the second direction are perpendicular to the third direction, and the first wall is adhesively connected to the housing. The battery device also includes a rubber stopper, at least a portion of which connects the first walls of two adjacent battery cells along the first direction and covers at least a portion of the first gap.

[0019] In the above solution, the glue blocking member can reduce the risk of the colloid entering the first gap and then solidifying and forming, thereby reducing the risk of the solidified colloid preventing the battery cell from expanding and causing lithium deposition in the battery cell.

[0020] According to some embodiments of the present application, the rubber blocking component includes a first part and a bent portion, the bent portion is connected to the end of the first part along the second direction, the first part covers the first gap, the bent portion is bent toward the battery cell relative to the first part, and is connected to the side of the battery cell along the second direction, the bent portion covers the first gap along the first direction, and is connected to the limiting component.

[0021] In the above solution, the setting of the glue blocking member includes a first portion and a bent portion, which is beneficial to further reduce the risk of the colloid entering the first gap, and further helps to reduce the risk of the solidified colloid in the first gap preventing the battery cell from expanding and causing lithium deposition in the battery cell.

[0022] According to some embodiments of the present application, the rubber blocking component includes two bent portions, and the two bent portions are respectively connected to two ends of the first portion along the second direction.

[0023] In the above solution, the two bent portions can block the colloid on both sides of the second direction close to one side of the box from entering the first gap, which is beneficial to further reduce the risk of the colloid between the first wall and the box entering the first gap, and further reduce the risk of lithium plating in the battery cell.

[0024] According to some embodiments of the present application, the rubber stopper is adhesively connected to the battery cell.

[0025] In the above solution, the glue blocking member is adhesively connected to the battery cell, which can improve the position stability of the glue blocking member relative to the battery cell, reduce the risk of the glue blocking member moving relative to the battery cell and affecting the covering effect of the first gap, and is conducive to improving the reliability of the glue blocking member in preventing the colloid from entering the first gap.

[0026] According to some embodiments of the present application, a dimension a of a portion where the rubber stopper is connected to the first wall along the first direction satisfies: 4 mm ≤ a ≤ 8 mm.

[0027] In the above solution, by setting 4mm≤a≤8mm, it is beneficial to improve the coverage of the first gap by the glue blocking member to reduce the risk of the glue entering the first gap, and it is also beneficial to improve the energy density of the battery device.

[0028] According to some embodiments of the present application, the material of the rubber stopper includes at least one of polypropylene, thermoplastic polyester and nylon.

[0029] In the above scheme, polypropylene has strong corrosion resistance and good toughness and elasticity, which is conducive to improving the structural stability of the rubber stopper, and facilitates the bending process of the rubber stopper, thereby facilitating the preparation of the rubber stopper.

[0030] According to some embodiments of the present application, a battery cell includes a housing and electrode terminals. The housing includes a second wall, the second wall being disposed on one side of the housing along a third direction, with the first direction, the second direction, and the third direction being perpendicular to each other. The battery device also includes a reinforcement member connecting the second walls of the plurality of battery cells.

[0031] In the above solution, it is beneficial to improve the overall structural strength of the battery device.

[0032] According to some embodiments of the present application, the reinforcement member is plate-shaped and has a first through-hole through which the electrode terminal is disposed. Alternatively, the reinforcement member further has a second through-hole, and the battery cell further includes a pressure relief mechanism disposed on the second wall and exposed through the second through-hole.

[0033] This solution increases the contact area between the reinforcement and the second wall, allowing the electrode terminal to pass through the first through-hole, facilitating connection between the electrode terminal and a busbar or other structure. The second through-hole exposes the pressure relief structure, allowing internal emissions from the battery cell to escape through the pressure relief mechanism and then be discharged smoothly through the second through-hole in the event of thermal runaway of the battery cell.

[0034] In a second aspect, the battery device provided in an embodiment of the present application includes the battery cell provided in any of the above embodiments.

[0035] The battery device provided in the embodiment of the present application has the same technical effects as any of the battery cells provided in any of the above embodiments, and thus will not be described in detail here.

[0036] In a third aspect, the electrical device provided in the embodiments of the present application includes the battery device provided in the above embodiments, and the battery device is used to provide electrical energy.

[0037] The electrical device provided in the embodiment of the present application has the same technical effects as the battery device provided in the embodiment of the present application, and thus will not be described in detail here.

[0038] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 relevant drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of the structure of a battery device provided in an embodiment of the present application;

[0042] Figure 3 A schematic diagram of a portion of the structure of a battery device provided in an embodiment of the present application;

[0043] 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;

[0044] Figure 5 A front view of a partial structure of a battery device provided in an embodiment of the present application;

[0045] Figure 6 A schematic diagram of a partial structure of a battery device provided in an embodiment of the present application;

[0046] Figure 7 A schematic diagram of a partial structure of another battery device provided in an embodiment of the present application;

[0047] Figure 8 This is a schematic structural diagram of the reinforcement member in the device provided in an embodiment of the present application.

[0048] In the drawings, the figures are not necessarily drawn to scale.

[0049] Description of reference numerals:

[0050] 1-Vehicle; 1a-Motor; 1b-Controller;

[0051] 10-battery device; 11-box; 111-first sub-box; 112-second sub-box;

[0052] 20-battery cell group; 20a-first gap;

[0053] 30 - battery cell; 31 - housing; 31a - first surface; 31b - second surface; 311 - housing; 312 - end cap; 313 - first wall; 314 - second wall; 32 - electrode assembly; 321 - electrode body; 322 - tab; 33 - electrode terminal; 34 - pressure relief mechanism;

[0054] 40-limiting piece;

[0055] 50-rubber stopper; 51-first part; 52-bending part;

[0056] 60-reinforcement member; 61-first through hole; 62-second through hole;

[0057] X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0058] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts 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 meanings as commonly understood by those skilled in the art to which this application belongs. 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" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" 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-secondary relationship.

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

[0061] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0062] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

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

[0064] The battery device mentioned in the embodiments of the present application may include one or more battery cell groups for providing voltage and capacity. The battery cell groups may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0065] In some embodiments, a battery cell group is typically formed by arranging multiple battery cells. For example, the battery cell group can be a battery module, which is formed by arranging and fixing multiple battery cells to form an independent module. For example, a battery module can be formed by bundling multiple battery cells with cable ties.

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

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

[0068] As an example, the battery cell group may also be housed in the case by directly fixing the 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, including 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-acid batteries, and the like.

[0073] A battery cell typically includes an electrode assembly. This assembly consists of a positive electrode, a negative electrode, and a separator. During the charge and discharge process, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, located between the positive and negative electrodes, prevents short circuits while allowing the active ions to pass through.

[0074] In some embodiments, the positive electrode may be a positive electrode sheet, which 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 provided on either or both of the two facing surfaces of the positive electrode current collector.

[0076] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, the metal foil can be silver-plated stainless steel, stainless steel, copper, aluminum, carbon electrodes, carbon, nickel, or titanium. A composite current collector can include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy) on a polymer substrate (such as 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, the metal foil may be silver-plated aluminum, silver-plated stainless steel, copper, aluminum, carbon electrode, carbon, nickel, or titanium.

[0080] In some embodiments, the negative electrode current collector has two opposite surfaces in its thickness direction, and the negative electrode active material is disposed on either 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 that is well 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 primary 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 particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces 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 transport 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, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0087] In some embodiments, the housing includes an end cap and a shell. The shell has an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly, electrolyte, and other substances. The shell may have one or more openings. One or more end caps may also be provided.

[0088] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to a tab of the electrode assembly. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via a current collector. The electrode terminal may be provided on an end cap or on the housing.

[0089] In some embodiments, the housing is provided with an explosion-proof valve for releasing the internal pressure of the battery cell.

[0090] 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, and a polygonal battery. The polygonal battery is, for example, a hexagonal battery, etc. There is no special limitation in the embodiments of the present application.

[0091] Battery cells expand during cycling. Buffers are typically placed between cells to elastically deform to accommodate this expansion, reducing the risk of lithium deposition caused by hindered expansion during cycling. However, buffers contribute minimally to the overall structural strength of the battery assembly and increase the difficulty of assembly.

[0092] In view of this, the battery device provided in the embodiments of the present application includes a housing, a battery cell group, and a limiting member. The battery cell group is accommodated in the housing, and the battery cell group includes a plurality of battery cells arranged along a first direction, with a first gap between two adjacent battery cells along the first direction, and the battery cells are adhesively connected to the housing. The limiting member is connected to at least one side of the plurality of battery cells along a second direction to limit the relative displacement of two adjacent battery cells along the first direction, where the first direction intersects the second direction.

[0093] The battery device provided in the embodiment of the present application provides a first gap between the battery cells to provide space for the expansion of the battery cells through the first gap, and limits the relative displacement of two adjacent battery cells along the first direction through a limiter, so that the first gap between adjacent battery cells is relatively stable. In this way, during the assembly of the battery device, the relative displacement between adjacent battery cells is limited by the limiter, so that adjacent battery cells have a stable first gap along the first direction, which facilitates the assembly of the battery device and can omit or simplify structures such as buffers between the battery cells. While reducing the risk of lithium deposition due to expansion of the battery cells, it is also beneficial to simplify the overall structure of the battery device and improve the energy density of the battery device.

[0094] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using battery devices.

[0095] The battery device disclosed in the embodiments of the present application can be used, but is not limited to, in 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 for the electrical device.

[0096] The embodiments of the present application provide an electrical device that uses a battery device as a power source. The electrical 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. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0097] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device according to an embodiment of the present application.

[0098] Please refer to Figure 1 , Figure 1 Schematic diagram of the structure of the vehicle 1 provided in an embodiment of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery device 10 is provided inside the vehicle 1. The battery device 10 can be provided at the bottom, head, or tail of the vehicle 1. The battery device 10 can be used to power the vehicle 1. For example, the battery device 10 can serve as an operating power source for the vehicle 1 and can be used for the circuit system of the vehicle 1, such as for the working power requirements of the vehicle 1 during startup, navigation, and operation.

[0099] The vehicle 1 may further include a controller 1 b and a motor 1 a . The controller 1 b is used to control the battery device 10 to supply power to the motor 1 a , for example, to meet the power requirements of the vehicle 1 during startup, navigation, and driving.

[0100] In some embodiments of the present application, the battery device 10 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0101] 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 3Schematic diagram of the exploded structure of a battery cell 30 provided in an embodiment of the present application. The battery device 10 includes a housing 11 and a battery cell 30, with the battery cell 30 housed within the housing 11. The housing 11 is used to provide a storage space for the battery cell 30 and can adopt a variety of structures. In some embodiments, the housing 11 can include a first sub-housing 111 and a second sub-housing 112, which cover each other and together define a storage space for the battery cell 30. The second sub-box 112 can be a hollow structure with one end open, and the first sub-box 111 can be a plate-like structure. 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 can also be hollow structures with one side open, and the open side of the first sub-box 111 covers the open side of the second sub-box 112.

[0102] In the battery device 10, there may be multiple battery cells 30, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 30. The multiple battery cells 30 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell group 20 may be housed within the housing 11. Alternatively, the battery device 10 may be configured such that multiple battery cells 30 are first connected in series, in parallel, or in a hybrid connection to form a battery cell group 20, which is then connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 11. The battery device 10 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 30.

[0103] 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.

[0104] Please refer to Figure 4 , Figure 4 Schematic diagram of the explosion structure of the battery cell 30 in the battery device 10 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 electrode terminals 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.

[0105] The housing 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, electrolyte, and other components. The housing 311 and the end cap 312 can be independent components. The housing 311 can be of various shapes and sizes. Specifically, the shape of the housing 311 can be determined according to the specific shape and size of the electrode assembly 32. The housing 311 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0106] The end cap 312 is a component that covers the opening of the housing 311 to isolate the internal environment of the battery cell 30 from the external environment. The shape of the end cap 312 can be adapted to the shape of the housing 311 to match the housing 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as an aluminum alloy). This prevents the end cap 312 from deforming when subjected to compression or collision, thereby providing the battery cell 30 with greater structural strength and improved reliability. Functional components such as electrode terminals 33 can be provided on the end cap 312. The electrode terminals 33 can be used to electrically connect to the electrode assembly 32 for outputting or inputting electrical energy from the battery cell 30. The end cap 312 can also be made of 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 to isolate the electrical connection components in the housing 311 from the end cap 312 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, or the like.

[0107] The electrode assembly 32 is a component in the battery cell 30 where electrochemical reactions occur. One or more electrode assemblies 32 may be contained in the housing 311. The electrode assembly 32 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The separator is used to separate the positive electrode sheet and the negative electrode sheet to avoid internal short circuits between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet with active materials constitute the electrode body 321 of the electrode assembly 32, and the portions of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab 322. The positive electrode tab and the negative electrode tab may be located together at one end of the electrode body 321 or respectively at both ends of the electrode body 321. 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 tab 322 connects to the electrode terminal 33 to form a current loop.

[0108] First, as Figure 3 and Figure 4As shown, the battery device 10 provided in an embodiment of the present application includes a housing 11, a battery cell group 20, and a limiting member 40. The battery cell group 20 is accommodated in the housing 11. The battery cell group 20 includes a plurality of battery cells 30 arranged along a first direction X. A first gap 20a is defined between two adjacent battery cells 30 along the first direction X. The battery cells 30 are adhesively connected to the housing 11. The limiting member 40 is connected to at least one side of the plurality of battery cells 30 along a second direction Y to limit the relative displacement of two adjacent battery cells 30 along the first direction X. The first direction X intersects with the second direction Y.

[0109] The battery device 10 may include one, two, or more battery cell groups 20 . The multiple battery cell groups 20 may be arranged in an array along a first direction X and a second direction Y. The multiple battery cells 30 in each battery cell group 20 are arranged along the first direction X, with a first gap 20 a defined between any two adjacent battery cells 30 along the first direction X.

[0110] It is understood that the battery cells 30 will expand to a certain extent during cycling. The first gaps 20a can serve as expansion space for the battery cells 30 along the first direction X. The size of the first gaps 20a can be set according to actual needs. The first gaps 20a between different battery cells 30 can be the same, or different first gaps 20a can be set between different battery cells 30. For example, the size of the first gaps 20a along the first direction X can be 2 mm, 3 mm, or 4 mm, etc.

[0111] Due to the presence of the first gaps 20a between the battery cells 30, during assembly of the battery cell pack 20 or the battery device 10, it is necessary to ensure that the first gaps 20a are provided between the battery cells 30, and it is necessary to control the size of the first gaps 20a along the first direction X. To this end, a stopper 40 is provided and connected to at least one side of the plurality of battery cells 30 along the second direction Y, so that the relative displacement of adjacent battery cells 30 along the first direction X is limited by the stopper 40.

[0112] Optionally, one stopper 40 may connect two, three, or more battery cells 30. For example, one stopper 40 may be provided to connect one side of all battery cells 30 in a battery cell group 20 along the second direction Y. The second direction Y intersects the first direction X. Optionally, the second direction Y may be perpendicular to the first direction X.

[0113] The battery cell 30 includes an electrode terminal 33, which is located on a side of the housing 31. The second direction Y may be the direction of the electrode terminal 33 located on the side of the housing 31, or the second direction Y may be a direction intersecting the side of the housing 31 where the electrode terminal 33 is located. In other words, the stopper 40 may be located on the side of the battery cell 30 where the electrode terminal 33 is located or on the side opposite to the side of the battery cell 30 where the electrode terminal 33 is located, or the stopper 40 may be located on the side of the battery cell 30 where the electrode terminal 33 intersects the wall.

[0114] The limiting member 40 is connected to the battery cell 30 . Optionally, the limiting member 40 may be connected to the housing 31 of the battery cell 30 by bonding, snapping, welding, or other suitable means.

[0115] A limit member 40 may be provided on one side of a battery cell group 20 along the second direction Y, or may be provided on both sides of the battery cell group 20 along the second direction Y. The limit member 40 may be in a plate shape, a strip shape, or other shapes.

[0116] The battery device 10 may include multiple battery cell groups 20 and multiple limiting members 40 . Adjacent battery cell groups 20 along the second direction Y may share the same limiting member 40 , or different battery cell groups 20 may be provided with different limiting members 40 .

[0117] During the assembly process of the battery device 10, the displacement of two adjacent battery cells 30 along the first direction X is limited by the limit member 40. Therefore, the first gap 20a between the battery cells 30 can be reserved in advance and the battery cell group 20 can be formed. The battery cell group 20 is then assembled in the box 11. There is no need to reserve the first gap 20a between the battery cells 30 during the assembly process, which helps to simplify the assembly process of the battery device 10.

[0118] The battery cells 30 are adhesively bonded to the housing 11. The adhesive connection between the battery cells 30 and the housing 11 provides a stable positional restraint for the battery cells 30, further reducing the risk of the battery cells 30 wobbling within the housing 11 or relative displacement between the battery cells 30 along the first direction X. Therefore, during assembly of the battery cell group 20, the position-limiting members 40 limit the displacement between adjacent battery cells 30, facilitating grouping of the battery cells 30 into a battery cell group 20. After assembly of the battery device 10, the position-limiting members 40 and the adhesive connection between the battery cells 30 and the housing 11 jointly limit the relative displacement of the battery cells 30 along the first direction X, thereby maintaining a stable first gap 20a between adjacent battery cells 30 along the first direction X.

[0119] The battery device 10 provided in the embodiment of the present application is provided with a first gap 20a between the battery cells 30 to provide space for the expansion of the battery cells 30 through the first gap 20a, and the relative displacement of two adjacent battery cells 30 along the first direction X is limited by the limiter 40, so that the first gap 20a between adjacent battery cells 30 is relatively stable. In this way, during the assembly process of the battery device 10, the relative displacement between adjacent battery cells 30 is limited by the limiter 40, so that adjacent battery cells 30 have a stable first gap 20a along the first direction X, which facilitates the assembly of the battery device 10 and can omit or simplify structures such as buffers between the battery cells 30. While reducing the risk of lithium deposition due to expansion of the battery cells 30, it is also beneficial to simplify the overall structure of the battery device 10 and improve the energy density of the battery device 10.

[0120] In some embodiments, the limiting member 40 is adhesively connected to the battery cell 30 .

[0121] Specifically, an adhesive layer may be coated on the limiting member 40 and covered with release paper. When bonding is required, the release paper is torn off to bond the limiting member 40 to the battery cell 30 .

[0122] In this way, the connection between the limiting member 40 and the battery cell 30 is convenient and reliable, which not only improves the reliability of the connection between the limiting member 40 and the battery cell 30 , but also facilitates the assembly efficiency of the battery device 10 .

[0123] In some embodiments, as Figure 5 As shown, at least one battery cell group 20 is provided with limiting members 40 on both sides along the second direction Y.

[0124] The battery device 10 may include one, two or more battery cell groups 20. By arranging limiting members 40 on both sides of at least one battery cell group 20 along the second direction Y, it is beneficial to improve the stability of the limiting members 40 on the battery cells 30, and further reduce the risk of relative displacement of adjacent battery cells 30 along the first direction X, so that there is a sufficiently large first gap 20a between the battery cells 30, which is beneficial to improving the reliability performance of the battery device 10.

[0125] In some embodiments, as Figure 5 As shown, the battery device 10 includes a plurality of battery cell groups 20 , at least part of which are arranged along the second direction Y, and the battery cells 30 of at least two adjacent battery cell groups 20 along the second direction Y are connected to the same limiting member 40 .

[0126] Optionally, some of the multiple battery cell groups 20 arranged along the second direction Y may share a limiting member 40 , or any two battery cell groups 20 arranged along the second direction Y may share the same limiting member 40 .

[0127] Specifically, an adhesive layer can be provided on both sides of the limit member 40, and release paper can be attached. During the bonding process, the release paper on one side can be torn off first, and after the bonding with the battery cell 30 on one side is completed, the release paper on the other side can be torn off and bonded to the battery cell 30 on the other side.

[0128] In this way, two adjacent battery cell groups 20 share the same limiting member 40, which is beneficial to reducing the number of limiting members 40. On the premise of simplifying the overall structure of the battery device 10, the two adjacent battery cell groups 20 are connected by the limiting member 40, which is beneficial to improving the overall structural strength of the battery device 10.

[0129] In some embodiments, the material of the stopper 40 includes polycarbonate.

[0130] Specifically, the material of the limiter 40 may be polycarbonate, which has strong structural strength and light weight. By setting the material of the limiter 40 to include polycarbonate, it is beneficial to improve the structural strength of the limiter 40, thereby improving the limiting effect of the battery cell 30 of the limiter 40, and is beneficial to improving the energy density of the battery device 10.

[0131] In some embodiments, the battery cell 30 includes an electrode assembly 32 that includes a lithium iron phosphate active material.

[0132] In this way, the electrode assembly 32 includes battery cells 30 containing lithium iron phosphate active materials, which generate less heat during operation. There is no need for thermal insulation between adjacent battery cells 30, and structures such as thermal insulation parts between the battery cells 30 can be omitted. There is only a first gap 20a between two adjacent battery cells 30, which is conducive to simplifying the structure of the battery cells 30.

[0133] In some embodiments, as Figure 3 and Figure 4 As shown, the battery cell 30 includes two first surfaces 31 a opposite to each other along a first direction X and two second surfaces 31 b opposite to each other along a second direction Y. The first surface 31 a connects the two second surfaces 31 b , and the area of ​​the first surface 31 a is larger than that of the second surface 31 b .

[0134] If the area of ​​the first surface 31a is greater than the area of ​​the second surface 31b, the first surfaces 31a of two battery cells 30 adjacent to each other in the battery cell group 20 along the first direction X are arranged adjacent to each other. In this manner, during cycling, the battery cells 30 primarily expand in a direction normal to the first surfaces 31a. Because a first gap 20a exists between the first surfaces 31a of two adjacent battery cells 30, the first gap 20a provides space for the battery cells 30 to expand, further reducing the risk of lithium deposition due to hindered expansion of the battery cells 30 during cycling.

[0135] In some embodiments, as Figure 6 As shown, the battery cell 30 has a first wall 313 along one side of the third direction Z. The first direction X and the second direction Y are perpendicular to the third direction Z. The first wall 313 is adhesively connected to the housing 11. The battery device 10 also includes a rubber stopper 50. At least a portion of the rubber stopper 50 connects the first walls 313 of two adjacent battery cells 30 along the first direction X and covers at least a portion of the first gap 20a.

[0136] The battery cell 30 is bonded to the box body 11 via the first wall 313 to position the battery cell 30 in the box body 11 , thereby reducing the risk of the battery cell 30 shaking in the box body 11 and improving the overall structural strength of the battery device 10 .

[0137] The rubber stopper 50 can completely cover the first gap 20a, or can be configured to cover a portion of the first gap 20a. The rubber stopper 50 can be connected to the first wall 313 by bonding or other means, and can prevent at least a portion of the colloid between the first wall 313 and the box body 11 from flowing into the first gap 20a.

[0138] In this way, the glue stopper 50 can reduce the risk of the glue entering the first gap 20 a and then solidifying, thereby reducing the risk of the glue solidifying enough to prevent the battery cell 30 from expanding and causing lithium deposition in the battery cell 30 .

[0139] In some embodiments, as Figure 6 As shown, the rubber blocking member 50 includes a first portion 51 and a bent portion 52, the bent portion 52 is connected to the end of the first portion 51 along the second direction Y, the first portion 51 covers the first gap 20a, the bent portion 52 is bent relative to the first portion 51 toward the battery cell 30, and is connected to the side of the battery cell 30 along the second direction Y, the bent portion 52 covers the first gap 20a along the first direction X, and is connected to the limit member 40.

[0140] Optionally, the limiting member 40 may have one or two bending portions 52 , and the two bending portions 52 may be connected to two ends of the first portion 51 along the second direction Y, respectively.

[0141] In this way, the first portion 51 can bend to cover one side of the first gap 20a along the third direction Z, further reducing the risk of the colloid between the first wall 313 and the housing 11 entering the first gap 20a. The bent portion 52 is bent relative to the first direction toward the battery cell 30 and abuts against the side of the battery cell 30 along the second direction Y. Thus, the first portion 51 and the bent portion 52 respectively cover one side of the first gap 20a along the third direction Z and at least a portion of the side along the second direction Y close to the housing 11.

[0142] Therefore, the setting of the glue blocking member 50 including the first portion 51 and the bent portion 52 is beneficial to further reduce the risk of the colloid entering the first gap 20a, and further helps to reduce the risk of the solidified colloid in the first gap 20a preventing the battery cell 30 from expanding and causing lithium deposition in the battery cell 30.

[0143] In some embodiments, the rubber blocking member 50 includes two bent portions 52 , and the two bent portions 52 are respectively connected to two ends of the first portion 51 along the second direction Y.

[0144] In this way, the two bent portions 52 can block the colloid on both sides of the second direction Y close to one side of the box body 11 from entering the first gap 20a, which is beneficial to further reduce the risk of the colloid between the first wall 313 and the box body 11 entering the first gap 20a, and further reduce the risk of lithium deposition in the battery cell 30.

[0145] In some embodiments, the rubber stopper 50 is bonded to the battery cell 30 .

[0146] The adhesive connection between the rubber stopper 50 and the battery cell 30 can improve the position stability of the rubber stopper 50 relative to the battery cell 30, reduce the risk of the rubber stopper 50 moving relative to the battery cell 30 and affecting the covering effect of the first gap 20a, and help improve the reliability of the rubber stopper 50 in preventing the colloid from entering the first gap 20a.

[0147] In some embodiments, as Figure 7 As shown, the dimension a of the portion where the rubber stopper 50 is connected to the first wall 313 along the first direction X satisfies: 4 mm ≤ a ≤ 8 mm.

[0148] Optionally, a can be 4mm, 5mm, 6mm, 7mm or 8mm, etc.

[0149] It can be understood that, to a certain extent, the larger the value of a is, the more conducive it is to improving the connection strength between the rubber blocking member 50 and the first wall 313, thereby improving the coverage effect of the rubber blocking member 50 on the first gap 20a, and reducing the risk of the colloid entering the first gap 20a. To a certain extent, the smaller the value of a is, the more conducive it is to reducing the weight and occupied space of the rubber blocking member 50, and improving the energy density of the battery device 10.

[0150] After systematic analysis and long-term practice, the inventors found that setting 4mm≤a≤8mm is beneficial to improving the coverage of the first gap 20a by the glue blocking member 50, thereby reducing the risk of colloid entering the first gap 20a, and also beneficial to improving the energy density of the battery device 10.

[0151] In some embodiments, the material of the rubber stopper 50 includes at least one of polypropylene, thermoplastic polyester, and nylon.

[0152] The material of the rubber stopper 50 can be polypropylene, thermoplastic polyester or nylon. Polypropylene, thermoplastic polyester and nylon have strong corrosion resistance and good toughness and elasticity. This is conducive to improving the structural stability of the rubber stopper 50, and facilitates the bending and other processes of the rubber stopper 50, thereby facilitating the preparation of the rubber stopper 50.

[0153] In some embodiments, as Figure 7 and Figure 8 As shown, the battery cell 30 includes a housing 31 and electrode terminals 33. The housing 31 includes a second wall 314. The second wall 314 is provided on one side of the housing 31 along the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The battery device 10 also includes a reinforcement member 60 that connects the second walls 314 of the plurality of battery cells 30.

[0154] Optionally, the reinforcement 60 may be in a strip shape, a block shape, etc., and along the third direction Z, the reinforcement 60 may not exceed the electrode terminal 33 to reduce the risk of interference between the reinforcement 60 and other structures.

[0155] The reinforcement member 60 may be directly attached to the second wall 314 , or the reinforcement member 60 may be adhesively connected to the second wall 314 .

[0156] The reinforcement 60 may connect multiple battery cells 30 of the same battery cell group 20, or may connect the second walls 314 of multiple battery cells 30 of different battery cell groups 20. For example, one reinforcement 60 may be provided to connect the second walls 314 of all battery cells 30.

[0157] Providing the reinforcement member 60 and connecting the reinforcement member 60 to the second wall 314 can help improve the overall structural strength of the battery device 10 .

[0158] In some embodiments, as Figure 7 and Figure 8As shown, the reinforcement member 60 is plate-shaped and has a first through-hole 61 through which the electrode terminal 33 is disposed. Alternatively, the reinforcement member 60 further has a second through-hole 62, and the battery cell 30 further includes a pressure relief mechanism 34 disposed on the second wall 314 and exposed through the second through-hole 62.

[0159] The reinforcement 60 is plate-shaped, which is beneficial to increasing the contact area between the reinforcement 60 and the second wall 314. By setting the first through hole 61, the electrode terminal 33 can pass through the first through hole 61, which facilitates the connection of the electrode terminal 33 to structures such as the busbar.

[0160] By providing the second through hole 62 and exposing the pressure relief structure through the second through hole 62 , in the event of thermal runaway of the battery cell 30 , the exhaust inside the battery cell 30 can be smoothly discharged through the second through hole 62 after leaking out through the pressure relief mechanism 34 .

[0161] In a second aspect, the battery device 10 provided in an embodiment of the present application includes the battery cell 30 provided in any of the above embodiments.

[0162] The battery device 10 provided in the embodiment of the present application includes the battery cell 30 provided in any of the above embodiments and thus has the same technical effects, which will not be described in detail here.

[0163] In a third aspect, the electrical device provided in the embodiment of the present application includes the battery device 10 provided in the above embodiment, and the battery device 10 is used to provide electrical energy.

[0164] The electric device provided in the embodiment of the present application has the same technical effects as the battery device 10 provided in the embodiment of the present application, and thus will not be described in detail here.

[0165] In some embodiments, as Figures 3 to 8As shown, the battery device 10 includes a housing 11, a battery cell group 20, a stopper 40, a rubber stopper 50, and a reinforcement 60. The battery cell group 20 is housed within the housing 11. The battery cell group 20 includes a plurality of battery cells 30 arranged along a first direction X, with a first gap 20a defined between two adjacent battery cells 30 along the first direction X. The stopper 40 is adhesively connected to at least one side of the plurality of battery cells 30 along a second direction Y to limit relative displacement of two adjacent battery cells 30 along the first direction X. The stopper 40 is provided on both sides of the battery cell group 20 along the second direction Y. At least a portion of the plurality of battery cell groups 20 are arranged along the second direction Y. The battery cells 30 of at least two adjacent battery cell groups 20 along the second direction Y are connected to the same stopper 40. The stopper 40 is made of polycarbonate. The battery cells 30 include an electrode assembly 32, which includes a lithium iron phosphate active material. The battery cell 30 includes two first surfaces 31a that oppose each other along a first direction X and two second surfaces 31b that oppose each other along a second direction Y. The first surface 31a connects the two second surfaces 31b, and the area of ​​the first surface 31a is larger than that of the second surface 31b. The battery cell 30 has a first wall 313 along one side of a third direction Z. The first direction X and the second direction Y are perpendicular to each other, and the first wall 313 is adhesively connected to the housing 11. At least a portion of the rubber stopper 50 is adhesively connected to the first walls 313 of two adjacent battery cells 30 along the first direction X and covers at least a portion of the first gap 20a. The rubber stopper 50 includes a first portion 51 and two bent portions 52. The bent portions 52 are connected to the ends of the first portion 51 along the second direction Y. The first portion 51 covers the first gap 20a. The bent portions 52 are connected to both ends of the first portion 51 along the second direction Y and are bent relative to the first portion 51 toward the battery cell 30. The bent portions 52 are connected to the sides of the battery cell 30 along the second direction Y. The bent portions 52 cover the first gap 20a along the first direction X and are connected to the stopper 40. The dimension a of the portion of the rubber stopper 50 connected to the first wall 313 along the first direction X satisfies the following: 4 mm ≤ a ≤ 8 mm. The material of the rubber stopper 50 is at least one of polypropylene, thermoplastic polyester, and nylon. The battery cell 30 includes a housing 31 and electrode terminals 33. The housing 31 includes a second wall 314 located on one side of the housing 31 along the third direction Z. The reinforcement 60 connects to the second walls 314 of the battery cells 30. The reinforcement 60 is plate-shaped and has a first through hole 61 and a second through hole 62 . The electrode terminal 33 is passed through the first through hole 61 . The battery cell 30 further includes a pressure relief mechanism 34 . The pressure relief mechanism 34 is disposed on the second wall 314 and exposed through the second through hole 62 .

[0166] The battery device 10 provided in the embodiment of the present application is provided with a first gap 20a between the battery cells 30 to provide space for the expansion of the battery cells 30 through the first gap 20a, and the relative displacement of two adjacent battery cells 30 along the first direction X is limited by the limiter 40, so that the first gap 20a between adjacent battery cells 30 is relatively stable. In this way, during the assembly process of the battery device 10, the relative displacement between adjacent battery cells 30 is limited by the limiter 40, so that adjacent battery cells 30 have a stable first gap 20a along the first direction X, which facilitates the assembly of the battery device 10 and can omit or simplify structures such as buffers between the battery cells 30. While reducing the risk of lithium deposition due to expansion of the battery cells 30, it is also beneficial to simplify the overall structure of the battery device 10 and improve the energy density of the battery device 10.

[0167] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described 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 encompasses all technical solutions within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Box; a battery cell group housed in the housing, the battery cell group comprising a plurality of battery cells arranged along a first direction, a first gap being defined between two adjacent battery cells along the first direction, and the battery cells being adhesively connected to the housing; A limiting member is connected to at least one side of the plurality of battery cells along the second direction to limit the relative displacement of two adjacent battery cells along the first direction, so that the adjacent battery cells have a stable first gap along the first direction, and the buffer member between the battery cells can be omitted, and the first direction intersects with the second direction.

2. The battery device according to claim 1, wherein: The limiting member is adhesively connected to the battery cell.

3. The battery device according to claim 1, wherein: The limiting members are provided on both sides of at least one of the battery cell groups along the second direction.

4. The battery device according to claim 1, wherein: The battery device includes a plurality of battery cell groups, at least some of which are arranged along the second direction, and the battery cells of at least two adjacent battery cell groups along the second direction are connected to the same limiting member.

5. The battery device according to claim 1, wherein: The material of the limiting element includes polycarbonate.

6. The battery device according to claim 1, wherein: The battery cell includes two first surfaces opposite to each other along a first direction and two second surfaces opposite to each other along a second direction. The first surface connects the two second surfaces, and an area of ​​the first surface is greater than an area of ​​the second surface.

7. The battery device according to any one of claims 1 to 6, characterized in that: The battery cell has a first wall along one side of a third direction, the first direction and the second direction are perpendicular to the third direction, and the first wall is bonded to the box body; The battery device further includes a rubber stopper, at least a portion of which connects the first walls of two adjacent battery cells along the first direction and covers at least a portion of the first gap.

8. The battery device according to claim 7, characterized in that The rubber blocking component includes a first part and a bent part, the bent part is connected to the end of the first part along the second direction, the first part covers the first gap, the bent part is bent toward the battery cell relative to the first part, and is connected to the side of the battery cell along the second direction, the bent part covers the first gap along the first direction, and is connected to the limiting component.

9. The battery device according to claim 8, characterized in that The rubber blocking component includes two bent portions, and the two bent portions are respectively connected to two ends of the first portion along the second direction.

10. The battery device according to claim 7, characterized in that The rubber stopper is bonded to the battery cell.

11. The battery device according to claim 7, wherein: A dimension a of a portion where the rubber stopper is connected to the first wall along the first direction satisfies the following: 4 mm ≤ a ≤ 8 mm.

12. The battery device according to claim 7, wherein: The material of the rubber stopper includes at least one of polypropylene, thermoplastic polyester and nylon.

13. The battery device according to any one of claims 1 to 6, characterized in that: The battery cell includes a housing and an electrode terminal, the housing includes a second wall, the second wall is provided on one side of the housing along a third direction, the electrode terminal is provided on the second wall, and the first direction, the second direction, and the third direction are perpendicular to each other; The battery device further includes a reinforcement member connecting the second walls of the plurality of battery cells.

14. The battery device according to claim 13, characterized in that: The reinforcement is plate-shaped, has a first through hole, and the electrode terminal is passed through the first through hole; and / or, The reinforcement member further has a second through hole, and the battery cell further includes a pressure relief mechanism, which is disposed on the second wall and exposed through the second through hole.

15. An electrical device, characterized in that: The battery device according to any one of claims 1 to 14 is used to provide electrical energy.

Images