Battery device and electric device

Abstract

The invention provides a battery device and a power utilization device, the battery device comprises a box body, a battery monomer group and a limiting piece, the battery monomer group is accommodated in the box body, the battery monomer group comprises a plurality of battery monomers arranged along a first direction, a first gap is formed between two adjacent battery monomers along the first direction, and the battery monomers are connected with the box body in a bonding manner. The limiting piece is connected to at least one side of the plurality of single batteries along the second direction so as to limit the relative displacement of two adjacent single batteries along the first direction, and the first direction is intersected with the second direction. According to the battery device provided by the invention, the assembly process of the battery device is simplified, the overall structure of the battery device is simplified, and the energy density of the battery device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, 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 vehicles, 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 simplify the overall structure of battery devices is an ongoing problem in battery device technology. Summary of the Invention

[0004] The present application provides a battery device and an electrical device, which is beneficial to simplifying the structure of the battery device.

[0005] The present application is implemented by the following technical solutions: In a first aspect, the battery device provided by the embodiments of the present application includes a box body, a battery cell group, and a limiting member. The battery cell group is accommodated in the box body. The battery cell group includes a plurality of battery cells arranged along a first direction. There is a first gap between two adjacent battery cells along the first direction. The battery cells are adhesively connected to the box body. 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.

[0006] For the battery device provided by the embodiments of the present application, by providing a first gap between the battery cells to provide space for the expansion of the battery cells, and by using the limiting member to limit the relative displacement of two adjacent battery cells along the first direction, the first gap between adjacent battery cells is relatively stable. In this way, during the assembly process of the battery device, the relative displacement between adjacent battery cells is restricted by the limiting member, so that adjacent battery cells have a stable first gap along the first direction, which is convenient for the assembly of the battery device, and the structures such as buffer members between the battery cells can be omitted or simplified. While reducing the risk of lithium deposition due to the 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.

[0007] According to some embodiments of the present application, the limiting member is adhesively connected to the battery cell.

[0008] In the above solution, the connection between the limiting member and the battery cell is convenient and reliable. While improving the connection reliability between the limiting member and the battery cell, it is also beneficial to the assembly efficiency of the battery device.

[0009] 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.

[0010] In the above solution, providing limiting members on both sides of at least one battery cell group along the second direction is beneficial to improving the stability of the limiting members in limiting 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, and thus is beneficial to improving the reliable performance of the battery device.

[0011] According to some embodiments of the present application, the battery device includes a plurality of battery cell groups, at least part of the plurality of battery cell groups 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.

[0012] In the above solution, two adjacent battery cell groups share the same limiting member, which is beneficial to reducing the number of limiting members. On the premise of simplifying the overall structure of the battery device, connecting two adjacent battery cell groups through the limiting member is beneficial to improving the overall structural strength of the battery device.

[0013] According to some embodiments of the present application, the material of the limiting member includes polycarbonate.

[0014] 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.

[0015] According to some embodiments of the present application, the battery cell includes two first surfaces opposite to each other along the first direction and two second surfaces opposite to each other along the second direction, the first surfaces connect the two second surfaces, and the area of the first surfaces is larger than the area of the second surfaces.

[0016] In the above solution, during the cyclic operation of the battery cell, it 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 beneficial to further reducing the risk of lithium plating caused by the expansion being blocked during the cyclic operation of the battery cell.

[0017] According to some embodiments of the present application, the battery cell has a first wall on one side along the third direction, the first direction, the second direction and the third direction are perpendicular to each other in pairs, and the first wall is adhesively connected to the box body. The battery device further includes a glue blocking member, at least part of the glue blocking member is connected to the first walls of two adjacent battery cells along the first direction and covers at least part of the first gap.

[0018] In the above solution, the glue-blocking member can reduce the risk of the colloid entering the first gap and then solidifying and forming, and further reduce the risk that the solidified colloid blocks the expansion of the battery cell and causes lithium plating in the battery cell.

[0019] According to some embodiments of the present application, the glue-blocking member includes a first part and a bending part. The bending part is connected to the end of the first part along the second direction. The first part covers the first gap. The bending part is bent relative to the first part toward the battery cell and is connected to the side of the battery cell along the second direction. The bending part covers the first gap along the first direction and is connected to the limiting member.

[0020] In the above solution, setting the glue-blocking member to include a first part and a bending part is beneficial to further reduce the risk of the colloid entering the first gap, and further beneficial to reduce the risk that the colloid solidified and formed in the first gap blocks the expansion of the battery cell and causes lithium plating of the battery cell.

[0021] According to some embodiments of the present application, the glue-blocking member includes two bending parts, and the two bending parts are respectively connected to both ends of the first part along the second direction.

[0022] In the above solution, the two bending parts can block the colloid on both sides close to one side of the box body along the second direction from entering the first gap, which is beneficial to further reduce the risk of the colloid between the first wall and the box body entering the first gap, and further reduce the risk of lithium plating of the battery cell.

[0023] According to some embodiments of the present application, the glue-blocking member is adhesively connected to the battery cell.

[0024] 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 that the movement of the glue-blocking member relative to the battery cell affects the covering effect of the first gap, and is beneficial to improving the reliable performance of the glue-blocking member to prevent the colloid from entering the first gap.

[0025] According to some embodiments of the present application, the dimension a of the part of the glue-blocking member connected to the first wall along the first direction satisfies: 4 mm ≤ a ≤ 8 mm.

[0026] In the above solution, by setting 4 mm ≤ a ≤ 8 mm, it is beneficial to improve the covering effect of the glue-blocking member on the first gap to reduce the risk of the colloid entering the first gap, and at the same time, it is beneficial to improve the energy density of the battery device.

[0027] According to some embodiments of the present application, the material of the glue-blocking member includes at least one of polypropylene, thermoplastic polyester, and nylon.

[0028] In the above solution, polypropylene has strong corrosion resistance, good toughness and elasticity. Thus, it is beneficial to improve the structural stability of the rubber baffle and facilitate processes such as bending the rubber baffle, which is convenient for the preparation of the rubber baffle.

[0029] According to some embodiments of the present application, the battery cell includes a housing and electrode terminals. The housing includes a second wall, and the second wall is provided on one side of the housing along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other in pairs. The battery device further includes a reinforcing member, and the reinforcing member connects the second walls of a plurality of battery cells.

[0030] In the above solution, it is beneficial to improve the overall structural strength of the battery device.

[0031] According to some embodiments of the present application, the reinforcing member is in a plate shape, and the reinforcing member has a first through hole, and the electrode terminal passes through the first through hole. And / or, the reinforcing member further has a second through hole, and the battery cell further includes a pressure relief mechanism, and the pressure relief mechanism is provided on the second wall and is exposed through the second through hole.

[0032] In the above solution, it is beneficial to increase the fitting area between the reinforcing member and the second wall. The electrode terminal passes through the first through hole, which is convenient for connecting the electrode terminal to structures such as a bus bar. The pressure relief structure is exposed through the second through hole. In the case of thermal runaway of the battery cell, after the emissions inside the battery cell leak out through the pressure relief mechanism, they can be smoothly discharged through the second through hole.

[0033] In a second aspect, the battery device provided by the embodiments of the present application includes the battery cell provided by any of the above embodiments.

[0034] The battery device provided by the embodiments of the present application has the same technical effects due to adopting the battery cell provided by any of the above embodiments, and will not be elaborated herein.

[0035] In a third aspect, the electrical device provided by the embodiments of the present application includes the battery device provided by the above embodiments, and the battery device is used to provide electrical energy.

[0036] The electrical device provided by the embodiments of the present application has the same technical effects due to adopting the battery device provided by the embodiments of the present application, and will not be elaborated herein.

[0037] The additional aspects and advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present application. Description of the Drawings

[0038] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following accompanying drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related accompanying drawings can also be obtained based on these drawings without creative efforts.

[0039] Figure 1 Schematic structural diagram of a vehicle provided by an embodiment of the present application; Figure 2 Schematic structural diagram of a battery device provided by an embodiment of the present application; Figure 3 Partial schematic structural diagram of a battery device provided by an embodiment of the present application; Figure 4 Explosion schematic structural diagram of a battery cell in a battery device provided by an embodiment of the present application; Figure 5 Front view of a partial structure of a battery device provided by an embodiment of the present application; Figure 6 Schematic structural diagram of a partial structure of a battery device provided by an embodiment of the present application; Figure 7 Schematic structural diagram of a partial structure of another battery device provided by an embodiment of the present application; Figure 8 Schematic structural diagram of a reinforcing member in a device provided by an embodiment of the present application.

[0040] In the accompanying drawings, the drawings are not necessarily drawn to scale.

[0041] Explanation of reference numerals: 1 - Vehicle; 1a - Motor; 1b - Controller; 10 - Battery device; 11 - Box body; 111 - First sub - box body; 112 - Second sub - box body; 20 - Battery cell group; 20a - First gap; 30 - Battery cell; 31 - Outer shell; 31a - First surface; 31b - Second surface; 311 - Shell; 312 - End cover; 313 - First wall; 314 - Second wall; 32 - Electrode assembly; 321 - Electrode body; 322 - Tab; 33 - Electrode terminal; 34 - Pressure relief mechanism; 40 - Limiting member; 50 - Rubber - blocking member; 51 - First part; 52 - Bending part; 60 - Reinforcing member; 61 - First through - hole; 62 - Second through - hole; X - First direction; Y - Second direction; Z - Third direction. Detailed implementation manners

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of the embodiments of this application in 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 description and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0044] Referring to "embodiments" in this application means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment when it appears in various places in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described in this application can be combined with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", and "attached to" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that three relationships can 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 represents an "or" relationship between the associated objects before and after.

[0047] The term "multiple" as used in this application refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0048] 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 group may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel or in a hybrid connection through a busbar component.

[0049] In some embodiments, the battery cell group is generally formed by arranging a plurality of battery cells; as an example, the battery cell group may be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells with cable ties.

[0050] In some embodiments, the battery device may be a battery pack, and the battery pack includes a box body and one or more battery cell groups, and the battery cell group is accommodated in the box body.

[0051] As an example, the battery cell group may be a battery module, and the battery cell group may be accommodated in the box body by fixing the battery module in the box body.

[0052] As an example, the battery cell group may also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0053] In some embodiments, the box body may be a part of the chassis structure of a vehicle. For example, a part of the box body may become at least a part of the floor of the vehicle, or a part of the box body may become at least a part of the cross beam and longitudinal beam of the vehicle.

[0054] In some embodiments, the battery device may be an energy storage device. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0055] In the embodiments of the present application, the battery cell may be a secondary battery, and the secondary battery refers to a battery cell that can activate the active material through charging after discharging the battery cell and can continue to be used.

[0056] The battery cell may be, but is not limited to, a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0057] The 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 the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can play a role in preventing short circuit between the positive and negative electrodes, and at the same time allow active ions to pass through.

[0058] In some embodiments, the positive electrode may be a positive electrode plate, and the positive electrode plate 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.

[0059] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is provided on either or both of the two opposite surfaces of the positive electrode current collector.

[0060] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, carbon electrode, carbon, nickel, titanium, etc. can be used. The composite current collector can include a polymer material 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, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0061] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of the battery cell can also be used.

[0062] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0063] As an example, the negative electrode current collector can 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, copper, aluminum, carbon electrode, carbon, nickel, titanium, etc. can be used.

[0064] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is provided on either or both of the two opposite surfaces of the negative electrode current collector.

[0065] As an example, the negative electrode active material can be a negative electrode active material for a battery cell well-known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of the battery cell can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0066] In some embodiments, the separator is an insulating film. The present application does not have a particular limitation on the type of the insulating film, and any well-known porous insulating film with good chemical stability and mechanical stability can be selected.

[0067] 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 ceramics. 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 located between the positive and negative electrodes, or can be attached to the surfaces of the positive and negative electrodes.

[0068] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0069] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0070] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0071] In some embodiments, the housing includes an end cap and a housing body. The housing body is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating substances such as the electrode assembly and the electrolyte. The housing body can be provided with one or more openings. One or more end caps can also be provided.

[0072] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing body.

[0073] In some embodiments, a pressure relief valve is provided on the housing. The pressure relief valve is used to release the internal pressure of the battery cell.

[0074] 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 multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. There is no particular limitation in the embodiments of the present application.

[0075] During the cyclic operation of the battery cell, expansion will occur. Usually, a buffer member is provided between the battery cells to provide space for the expansion of the battery cell through the elastic deformation of the buffer member, and reduce the risk of lithium deposition caused by the hindered expansion of the battery cell during cyclic operation. However, the contribution of the buffer member to the overall structural strength of the battery device is extremely low, and it increases the difficulty of the battery device assembly process.

[0076] In view of this, the battery device provided by the embodiment of the present application includes a box body, a battery cell group, and a limiting member. The battery cell group is accommodated in the box body. The battery cell group includes a plurality of battery cells arranged along a first direction. There is a first gap between two adjacent battery cells along the first direction. The battery cells are adhesively connected to the box body. 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.

[0077] In the battery device provided by the embodiment of the present application, by providing a first gap between the battery cells to provide space for the expansion of the battery cells through the first gap, and by using the limiting member to limit the relative displacement of two adjacent battery cells along the first direction, the first gap between adjacent battery cells is made relatively stable. In this way, during the assembly process of the battery device, by using the limiting member to limit the relative displacement between adjacent battery cells, a stable first gap is formed between adjacent battery cells along the first direction, which facilitates the assembly of the battery device, and structures such as buffer members between the battery cells can be omitted or simplified. While reducing the risk of lithium plating due to the 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.

[0078] The technical solution described in the embodiment of the present application is applicable to battery devices and electrical devices using battery devices.

[0079] The battery device disclosed in the embodiment of the present application can be but is not limited to being used in electrical devices such as vehicles, ships, or aircraft. The power supply system of the electrical device can be composed of the battery device disclosed in the present application.

[0080] The embodiment of the present application provides an electrical device using a battery device as a power source. The electrical device can be but is not limited to mobile phones, tablet computers, laptop computers, electric toys, electric tools, electric bicycles, electric motorcycles, electric vehicles, ships, spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0081] For the convenience of description in the following embodiments, an electrical device in an embodiment of the present application is taken as an example of a vehicle 1 for illustration.

[0082] Please refer to Figure 1 , Figure 1Schematic structural diagram of vehicle 1 provided by an embodiment of the present application. 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 disposed inside vehicle 1. The battery device 10 can be disposed at the bottom, head or tail of vehicle 1. The battery device 10 can be used to supply power to vehicle 1. For example, the battery device 10 can serve as the operating power source of vehicle 1 and be used for the circuit system of vehicle 1, such as the working power requirements for starting, navigating and running of vehicle 1.

[0083] Vehicle 1 may further include a controller 1b and a motor 1a. The controller 1b is used to control the battery device 10 to supply power to the motor 1a. For example, it is used for the working power requirements for starting, navigating and driving of vehicle 1.

[0084] In some embodiments of the present application, the battery device 10 can not only serve as the operating power source of vehicle 1, but also serve as the driving power source of vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1.

[0085] Please refer to Figure 2 and Figure 3 , Figure 2 Schematic structural diagram of the battery device 10 provided by an embodiment of the present application, Figure 3 Exploded structural diagram of the battery cell 30 provided by an embodiment of the present application. The battery device 10 includes a box body 11 and battery cells 30. The battery cells 30 are accommodated in the box body 11. Among them, the box body 11 is used to provide an accommodation space for the battery cells 30, and the box body 11 can adopt various structures. In some embodiments, the box body 11 may include a first sub-box body 111 and a second sub-box body 112. The first sub-box body 111 and the second sub-box body 112 cover each other, and the first sub-box body 111 and the second sub-box body 112 jointly define an accommodation space for accommodating the battery cells 30. The second sub-box body 112 can be a hollow structure with one end open. The first sub-box body 111 can be a plate-like structure. The first sub-box body 111 covers the open side of the second sub-box body 112 so that the first sub-box body 111 and the second sub-box body 112 jointly define an accommodation space; the first sub-box body 111 and the second sub-box body 112 can also both be hollow structures with one side open, and the open side of the first sub-box body 111 covers the open side of the second sub-box body 112.

[0086] In the battery device 10, there may be multiple battery cells 30. The multiple battery cells 30 can be connected in series, in parallel, or in a combined series-parallel connection. A combined series-parallel connection means that there are both series and parallel connections among the multiple battery cells 30. The multiple battery cells 30 can be directly connected in series, in parallel, or in a combined series-parallel connection together, and then the whole formed by the multiple battery cells 30 is accommodated in the box body 11. Of course, in the battery device 10, multiple battery cells 30 can also be first connected in series, in parallel, or in a combined series-parallel connection to form the form of battery cell groups 20, and then the multiple battery cell groups 20 are connected in series, in parallel, or in a combined series-parallel connection to form a whole and are accommodated in the box body 11. The battery device 10 can also include other structures. For example, the battery device 10 can also include a busbar component for realizing the electrical connection among the multiple battery cells 30.

[0087] Among them, the battery cell 30 can be a secondary battery or a primary battery; the battery cell 30 can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0088] Please refer to Figure 4 , Figure 4 which is a schematic diagram of the explosion structure of the battery cell 30 in the battery device 10 provided in the embodiment of the present application. As Figure 4 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.

[0089] The shell 311 is a component for cooperating with the end cap 312 to form the internal environment of the battery cell 30. Among them, 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 various 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.

[0090] The end cap 312 refers to a component that covers the opening of the housing 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 housing 311 to fit the housing 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 312 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 30 to have higher structural strength and improved reliability. Functional components such as electrode terminals 33 can be provided on the end cap 312. The electrode terminal 33 can be used for electrical connection with the electrode assembly 32 to output or input the electrical energy of the battery cell 30. The material of the end cap 312 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cap 312, and the insulating structure can be used to isolate the electrical connection components in the housing 311 from the end cap 312 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0091] The electrode assembly 32 is a component in the battery cell 30 where an electrochemical reaction occurs. The housing 311 can contain one or more electrode assemblies 32. The electrode assembly 32 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and usually an isolation film is provided between the positive electrode plate and the negative electrode plate to separate the positive electrode plate and the negative electrode plate to prevent internal short circuit between the positive electrode plate and the negative electrode plate. The parts of the positive electrode plate and the negative electrode plate with active substances constitute the electrode body 321 of the electrode assembly 32, and the parts of the positive electrode plate and the negative electrode plate without active substances respectively constitute the electrode tabs 322. The positive electrode tab and the negative electrode tab can be located at one end of the electrode body 321 together or at both ends of the electrode body 321 respectively. During the charging and discharging process of the battery cell 30, the positive electrode active substance and the negative electrode active substance react with the electrolyte, and the electrode tabs 322 are connected to the electrode terminals 33 to form a current loop.

[0092] In a first aspect, as Figure 3 and Figure 4 shown, the battery device 10 provided by the embodiments of the present application includes a box body 11, a battery cell group 20, and a limiting member 40. The battery cell group 20 is accommodated in the box body 11. The battery cell group 20 includes a plurality of battery cells 30 arranged along a first direction X. There is a first gap 20a between two adjacent battery cells 30 along the first direction X. The battery cells 30 are adhesively connected to the box body 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.

[0093] The battery device 10 may include one, two or more battery cell groups 20, and 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, and there is a first gap 20a between any two adjacent battery cells 30 along the first direction X.

[0094] It can be understood that during the cyclic operation of the battery cells 30, certain expansion will occur. The first gap 20a can serve as the expansion space for the battery cells 30 along the first direction X, and the size of the first gap 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. Exemplarily, the dimension of the first gap 20a along the first direction X can be 2 mm, 3 mm or 4 mm, etc.

[0095] Due to the existence of the first gap 20a between the battery cells 30, during the assembly of the battery cell group 20 or the battery device 10, it is necessary to make there be a first gap 20a between the battery cells 30 and control the dimension of the first gap 20a along the first direction X. For this purpose, a limiting member 40 is arranged to be connected to at least one side of the multiple battery cells 30 along the second direction Y, so as to limit the relative displacement of the adjacent battery cells 30 along the first direction X through the limiting member 40.

[0096] Optionally, one limiting member 40 can be connected to two, three or more battery cells 30. Exemplarily, one limiting member 40 can be arranged to be connected to one side of all the battery cells 30 in a battery cell group 20 along the second direction Y. The second direction Y intersects with the first direction X. Optionally, the second direction Y can be perpendicular to the first direction X.

[0097] The battery cell 30 includes an electrode terminal 33, and the electrode terminal 33 is arranged on the side part of the housing 31. The second direction Y can be the direction in which the electrode terminal 33 is located on the side part of the housing 31, or the second direction Y can be the direction intersecting with the side part of the housing 31 where the electrode terminal 33 is located. In other words, the limiting member 40 can be arranged on the side where the battery cell 30 is provided with the electrode terminal 33 or the opposite side, or the limiting member 40 can be arranged on the side part of the battery cell 30 intersecting with the wall part where the electrode terminal 33 is located.

[0098] The limiting member 40 is connected to the battery cell 30. Optionally, the limiting member 40 can be adhesively connected, snap-connected, welded or connected together with the housing 31 of the battery cell 30 by other suitable means.

[0099] A limiting member 40 may be provided on one side of the battery cell group 20 along the second direction Y, or limiting members 40 may be provided on both sides of the battery cell group 20 along the second direction Y. The limiting member 40 may be in the shape of a plate, a strip, or other shapes.

[0100] The battery device 10 may include a plurality of battery cell groups 20 and a plurality of limiting members 40. The battery cell groups 20 adjacent along the second direction Y may share the same limiting member 40, or different battery cell groups 20 may be respectively provided with different limiting members 40.

[0101] During the assembly of the battery device 10, the displacement of two adjacent battery cells 30 along the first direction X is restricted by the limiting member 40, so that the first gap 20a between the battery cells 30 can be reserved more conveniently in advance, and the battery cell group 20 can be formed. Then, the battery cell group 20 is assembled in the box body 11. It is not necessary to reserve the first gap 20a between the battery cells 30 during the assembly process, which is beneficial to simplifying the assembly process of the battery device 10.

[0102] The battery cell 30 is adhesively connected to the box body 11 to provide a stable limiting effect for the battery cell 30 through the adhesive connection between the battery cell 30 and the box body 11, and further reduce the risk of the battery cell 30 shaking in the box body 11 or the relative displacement of the battery cells 30 along the first direction X. Therefore, during the assembly of the battery cell group 20, the displacement between adjacent battery cells 30 is restricted by the limiting member 40, which facilitates the grouping of the battery cells 30 into the battery cell group 20. After the battery device 10 is assembled, the relative displacement of the battery cells 30 along the first direction X is jointly limited by the limiting member 40 and the adhesive connection between the battery cell 30 and the box body 11, so that there is a stable first gap 20a between the battery cells 30 adjacent along the first direction X.

[0103] The battery device 10 provided by the embodiment of the present application has 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. The relative displacement of two adjacent battery cells 30 along the first direction X is restricted by the limiting member 40, so that the first gap 20a between the adjacent battery cells 30 is relatively stable. In this way, during the assembly of the battery device 10, the relative displacement between adjacent battery cells 30 is restricted by the limiting member 40, so that the adjacent battery cells 30 have a stable first gap 20a along the first direction X, which is convenient for the assembly of the battery device 10, and structures such as buffer members between the battery cells 30 can be omitted or simplified. While reducing the risk of lithium deposition due to the 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.

[0104] In some embodiments, the limiting member 40 is adhesively connected to the battery cell 30.

[0105] Specifically, an adhesive layer can be coated on the limiting member 40 and covered with a release paper. When adhesion is required, the release paper can be torn off, and then the limiting member 40 can be adhesively connected to the battery cell 30.

[0106] In this way, the connection between the limiting member 40 and the battery cell 30 is convenient and reliable. While improving the connection reliability between the limiting member 40 and the battery cell 30, it is also beneficial to the assembly efficiency of the battery device 10.

[0107] In some embodiments, as Figure 5 shown, limiting members 40 are provided on both sides of at least one battery cell group 20 along the second direction Y.

[0108] The battery device 10 can include one, two or more battery cell groups 20. By providing 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 member 40 in limiting the battery cell 30, further reducing 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, and thus it is beneficial to improve the reliable performance of the battery device 10.

[0109] In some embodiments, as Figure 5 shown, the battery device 10 includes a plurality of battery cell groups 20, at least a part of the plurality of battery cell groups 20 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.

[0110] Optionally, it can be set that some of the plurality of battery cell groups 20 arranged along the second direction Y share one limiting member 40, or it can be set that any two adjacent battery cell groups 20 arranged along the second direction Y share the same limiting member 40.

[0111] Specifically, adhesive layers can be provided on both sides of the limiting member 40 and release papers are attached. During the adhesion process, the release paper on one side can be torn off first. After the adhesion with the battery cell 30 on one side is completed, the release paper on the other side can be torn off and adhesively connected to the battery cell 30 on the other side.

[0112] 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, connecting two adjacent battery cell groups 20 through the limiting member 40 is also beneficial to improving the overall structural strength of the battery device 10.

[0113] In some embodiments, the material of the limiting member 40 includes polycarbonate.

[0114] Specifically, the material of the limiting member 40 can be polycarbonate, which has strong structural strength and a relatively light weight. By setting the material of the limiting member 40 to include polycarbonate, it is beneficial to improve the structural strength of the limiting member 40, thereby enhancing the limiting effect of the limiting member 40 on the battery cell 30, and is beneficial to improving the energy density of the battery device 10.

[0115] In some embodiments, the battery cell 30 includes an electrode assembly 32, and the electrode assembly 32 includes lithium iron phosphate active material.

[0116] In this way, the battery cell 30 with the electrode assembly 32 including lithium iron phosphate active material generates less heat during operation. There may be no need for heat insulation between adjacent battery cells 30, and structures such as heat insulation members between the battery cells 30 can be omitted. There is only a first gap 20a between two adjacent battery cells 30, which is beneficial to simplifying the structure of the battery cell 30.

[0117] In some embodiments, as Figure 3 and Figure 4 shown, the battery cell 30 includes two first surfaces 31a opposite to each other along the first direction X and two second surfaces 31b opposite to each other along the second direction Y. The first surfaces 31a connect the two second surfaces 31b, and the area of the first surfaces 31a is larger than the area of the second surfaces 31b.

[0118] Since the area of the first surfaces 31a is larger than the area of the second surfaces 31b, the first surfaces 31a of two adjacent battery cells 30 in the battery cell group 20 along the first direction X are arranged adjacent to each other. In this way, during the cyclic operation of the battery cell 30, it mainly expands in the normal direction of the first surface 31a. Since there is a first gap 20a between the first surfaces 31a of two adjacent battery cells 30, the first gap 20a can provide space for the expansion of the battery cell 30, which is beneficial to further reducing the risk of lithium plating caused by the expansion being blocked during the cyclic operation of the battery cell 30.

[0119] In some embodiments, as Figure 6 shown, the battery cell 30 has a first wall 313 on one side along the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs, and the first wall 313 is adhesively connected to the box body 11. The battery device 10 further includes a glue blocking member 50, and at least a part of the glue blocking member 50 is connected to the first walls 313 of two adjacent battery cells 30 along the first direction X and covers at least a part of the first gap 20a.

[0120] The battery cell 30 is adhesively connected to the box body 11 through the first wall 313 to position the battery cell 30 in the box body 11, reduce the risk of the battery cell 30 shaking in the box body 11, and improve the overall structural strength of the battery device 10.

[0121] The glue blocking member 50 can completely cover the first gap 20a, or the glue blocking member 50 is arranged to cover a part of the first gap 20a. The glue blocking member 50 can be connected to the first wall 313 by means of adhesive connection or the like, and the glue blocking member 50 can prevent at least part of the colloid between the first wall 313 and the box body 11 from flowing into the first gap 20a.

[0122] In this way, the glue blocking member 50 can reduce the risk of the colloid entering the first gap 20a and then curing and forming, and further reduce the risk that the cured colloid prevents the battery cell 30 from expanding and causes lithium plating of the battery cell 30.

[0123] In some embodiments, as Figure 6 shown, the glue blocking member 50 includes a first part 51 and a bending part 52. The bending part 52 is connected to the end of the first part 51 along the second direction Y. The first part 51 covers the first gap 20a. The bending part 52 is bent relative to the first part 51 towards the battery cell 30 and is connected to the side part of the battery cell 30 along the second direction Y. The bending part 52 covers the first gap 20a along the first direction X and is connected to the limiting member 40.

[0124] Optionally, the limiting member 40 can have one or two bending parts 52, and the two bending parts 52 can be respectively connected to both ends of the first part 51 along the second direction Y.

[0125] In this way, the first part 51 can bend and 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 box body 11 entering the first gap 20a. The bending part 52 is bent relative to the first part 51 towards the battery cell 30 and fits with the side part of the battery cell 30 along the second direction Y. In this way, the first part 51 and the bending part 52 respectively cover one side of the first gap 20a along the third direction Z and at least part of the side part close to the box body 11 along the second direction Y.

[0126] Therefore, setting the glue blocking member 50 to include the first part 51 and the bending part 52 is beneficial to further reduce the risk of the colloid entering the first gap 20a, and further beneficial to reduce the risk that the colloid cured and formed in the first gap 20a prevents the battery cell 30 from expanding and causes lithium plating of the battery cell 30.

[0127] In some embodiments, the glue blocking member 50 includes two bending parts 52, and the two bending parts 52 are respectively connected to both ends of the first part 51 along the second direction Y.

[0128] Thus, the two bending portions 52 can prevent the colloid on both sides approaching one side of the box body 11 in the second direction Y 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 plating in the battery cell 30.

[0129] In some embodiments, the glue blocking member 50 is adhesively connected to the battery cell 30.

[0130] The adhesive connection between the glue blocking member 50 and the battery cell 30 can improve the position stability of the glue blocking member 50 relative to the battery cell 30, reduce the risk that the movement of the glue blocking member 50 relative to the battery cell 30 affects the covering effect on the first gap 20a, and is beneficial to improving the reliable performance of the glue blocking member 50 to prevent the colloid from entering the first gap 20a.

[0131] In some embodiments, as Figure 7 shown, the dimension a of the portion of the glue blocking member 50 connected to the first wall 313 in the first direction X satisfies: 4 mm ≤ a ≤ 8 mm.

[0132] Optionally, a can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, etc.

[0133] It can be understood that, to a certain extent, the larger the value of a, the more beneficial it is to improve the connection strength between the glue blocking member 50 and the first wall 313, thereby improving the covering effect of the glue blocking member 50 on the first gap 20a and reducing the risk of the colloid entering the first gap 20a. And to a certain extent, the smaller the value of a, the more beneficial it is to reduce the weight and occupied space of the glue blocking member 50, which is beneficial to improving the energy density of the battery device 10.

[0134] After systematic analysis and long-term practice, the inventor found that by setting 4 mm ≤ a ≤ 8 mm, it is beneficial to improve the covering effect of the glue blocking member 50 on the first gap 20a to reduce the risk of the colloid entering the first gap 20a, and at the same time, it is also beneficial to improve the energy density of the battery device 10.

[0135] In some embodiments, the material of the glue blocking member 50 includes at least one of polypropylene, thermoplastic polyester, and nylon.

[0136] The material of the glue blocking member 50 can be polypropylene, thermoplastic polyester, or nylon. Polypropylene, thermoplastic polyester, and nylon have strong corrosion resistance, good toughness and elasticity. Thus, it is beneficial to improve the structural stability of the glue blocking member 50, and it is convenient to perform processes such as bending on the glue blocking member 50, which is convenient for the preparation of the glue blocking member 50.

[0137] In some embodiments, as Figure 7 and Figure 8As shown, the battery cell 30 includes a housing 31 and electrode terminals 33. The housing 31 includes a second wall 314, and the second wall 314 is disposed 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 further includes a reinforcing member 60, and the reinforcing member 60 is connected to the second walls 314 of a plurality of battery cells 30.

[0138] Optionally, the reinforcing member 60 may be strip-shaped, block-shaped, etc. Along the third direction Z, the reinforcing member 60 may be arranged not to exceed the electrode terminals 33, so as to reduce the risk of interference between the reinforcing member 60 and other structures.

[0139] The reinforcing member 60 may be directly attached to the second wall 314, or the reinforcing member 60 may be adhesively connected to the second wall 314.

[0140] The reinforcing member 60 may be connected to a plurality of battery cells 30 of the same battery cell group 20, or the reinforcing member 60 may be connected to the second walls 314 of a plurality of battery cells 30 of different battery cell groups 20. Exemplarily, one reinforcing member 60 may be provided to connect the second walls 314 of all the battery cells 30.

[0141] By providing the reinforcing member 60 and connecting the reinforcing member 60 to the second wall 314, it is beneficial to improve the overall structural strength of the battery device 10.

[0142] In some embodiments, as Figure 7 and Figure 8 shown, the reinforcing member 60 is plate-shaped, the reinforcing member 60 has a first through hole 61, and the electrode terminal 33 passes through the first through hole 61. And / or, the reinforcing member 60 further has a second through hole 62. The battery cell 30 further includes a pressure relief mechanism 34, and the pressure relief mechanism 34 is disposed on the second wall 314 and is exposed through the second through hole 62.

[0143] The reinforcing member 60 is plate-shaped. In this way, it is beneficial to increase the contact area between the reinforcing member 60 and the second wall 314. By providing the first through hole 61, the power supply terminal 33 can pass through the first through hole 61, which facilitates the connection of the electrode terminal 33 to structures such as a bus bar.

[0144] By providing the second through hole 62, the pressure relief structure is exposed through the second through hole 62. In the case of thermal runaway of the battery cell 30, after the emissions inside the battery cell 30 leak out through the pressure relief mechanism 34, they can be smoothly discharged through the second through hole 62.

[0145] In a second aspect, the battery device 10 provided by an embodiment of the present application includes the battery cell 30 provided by any of the above embodiments.

[0146] The battery device 10 provided by the embodiment of the present application includes the battery cell 30 provided by any of the above embodiments, and thus has the same technical effects, which will not be elaborated herein.

[0147] In a third aspect, the power consumption device provided by the embodiment of the present application includes the battery device 10 provided by the above embodiment, and the battery device 10 is used to provide electric energy.

[0148] The power consumption device provided by the embodiment of the present application adopts the battery device 10 provided by the embodiment of the present application, and thus has the same technical effects, which will not be elaborated herein.

[0149] In some embodiments, such as Figures 3 to 8As shown in the figure, the battery device 10 includes a box body 11, a battery cell group 20, a limiting member 40, a glue-blocking member 50, and a reinforcing member 60. The battery cell group 20 is accommodated in the box body 11. The battery cell group 20 includes a plurality of battery cells 30 arranged along the first direction X, and there is a first gap 20a between two adjacent battery cells 30 along the first direction X. The limiting member 40 is adhesively connected to at least one side of the plurality of battery cells 30 along the second direction Y to limit the relative displacement of two adjacent battery cells 30 along the first direction X. Limiting members 40 are provided on both sides of the battery cell group 20 along the second direction Y. At least a part of the plurality of battery cell groups 20 is 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 limiting member 40. The material of the limiting member 40 includes polycarbonate. The battery cell 30 includes an electrode assembly 32, and the electrode assembly 32 includes a lithium iron phosphate active material. The battery cell 30 includes two first surfaces 31a opposite to each other along the first direction X and two second surfaces 31b opposite to each other along the second direction Y. The first surfaces 31a connect the two second surfaces 31b, and the area of the first surfaces 31a is larger than the area of the second surfaces 31b. The battery cell 30 has a first wall 313 on one side along the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs. The first wall 313 is adhesively connected to the box body 11. At least a part of the glue-blocking member 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 part of the first gap 20a. The glue-blocking member 50 includes a first part 51 and two bending parts 52. The bending parts 52 are connected to the ends of the first part 51 along the second direction Y. The first part 51 covers the first gap 20a. The bending parts 52 are connected to both ends of the first part 51 along the second direction Y and are bent relative to the first part 51 toward the battery cell 30. The bending parts 52 are connected to the side parts of the battery cell 30 along the second direction Y. The bending parts 52 cover the first gap 20a along the first direction X and are connected to the limiting member 40. The dimension a of the part of the glue-blocking member 50 connected to the first wall 313 along the first direction X satisfies: 4mm ≤ a ≤ 8mm. The material of the glue-blocking member 50 includes at least one of polypropylene, thermoplastic polyester, and nylon. The battery cell 30 includes a housing 31 and an electrode terminal 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 reinforcing member 60 connects the second walls 314 of the plurality of battery cells 30. The reinforcing member 60 is in a plate shape. The reinforcing member 60 has a first through hole 61 and a second through hole 62. The electrode terminal 33 passes through the first through hole 61. The battery cell 30 further includes a pressure relief mechanism 34. The pressure relief mechanism 34 is provided on the second wall 314 and is exposed through the second through hole 62.

[0150] The battery device 10 provided by the embodiment of the present application is configured such that there is a first gap 20a between the battery cells 30, so as to provide space for the expansion of the battery cells 30 through the first gap 20a. The relative displacement of two adjacent battery cells 30 along the first direction X is restricted by the limiting member 40, so that the first gap 20a between the adjacent battery cells 30 is relatively stable. Thus, during the assembly process of the battery device 10, the relative displacement between the adjacent battery cells 30 is restricted by the limiting member 40, so that the adjacent battery cells 30 have a stable first gap 20a along the first direction X, which facilitates the assembly of the battery device 10. Moreover, structures such as buffer members between the battery cells 30 can be omitted or simplified. While reducing the risk of lithium plating due to the 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.

[0151] Although the present application has been described with reference to the preferred embodiments, various modifications can be made thereto and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any manner. 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, Comprising: A box body; A battery cell group, accommodated in the box body, the battery cell group includes a plurality of battery cells arranged along a first direction, there is a first gap between two adjacent battery cells along the first direction, and the battery cells are adhesively connected to the box body; A limiting member, 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.

2. The battery device according to claim 1, characterized in that, The limiting member is adhesively connected to the battery cell.

3. The battery device according to claim 1, characterized in that, At least one limiting member is provided on both sides of the battery cell group along the second direction.

4. The battery device according to claim 1, characterized in that, The battery device includes a plurality of the battery cell groups, at least a part of the plurality of battery cell groups 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, characterized in that, The material of the limiting member includes polycarbonate.

6. The battery device according to claim 1, characterized in that, The battery cell includes two first surfaces opposite to each other along the first direction and two second surfaces opposite to each other along the second direction, the first surfaces connect the two second surfaces, and the area of the first surface is larger than the 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 on one side along a third direction, the first direction, the second direction and the third direction are perpendicular to each other in pairs, and the first wall is adhesively connected to the box body; The battery device further includes a glue-blocking member, at least a part of the glue-blocking member is connected to the first walls of two adjacent battery cells along the first direction and covers at least a part of the first gap.

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

9. The battery device according to claim 8, characterized in that, The glue-blocking member includes two bending parts, and the two bending parts are respectively connected to both ends of the first part along the second direction.

10. The battery device according to claim 7, characterized in that, The glue-blocking member is adhesively connected to the battery cell.

11. The battery device according to claim 7, characterized in that, The dimension a of the part of the glue-blocking member connected to the first wall along the first direction satisfies: 4mm ≤ a ≤ 8mm.

12. The battery device according to claim 7, characterized in that, The material of the glue-blocking member 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 electrode terminals, the housing includes a second wall, and the second wall is provided on one side of the housing along the third direction, the first direction, the second direction and the third direction are perpendicular to each other in pairs; The battery device further includes a strengthening member, and the strengthening member is connected to the second walls of the plurality of battery cells.

14. The battery device according to claim 13, wherein The strengthening member is in a plate shape, the strengthening member has a first through hole, and the electrode terminal passes through the first through hole; and / or, The strengthening member further has a second through hole, the battery cell further includes a pressure relief mechanism, the pressure relief mechanism is provided on the second wall and is exposed through the second through hole.

15. A battery device, characterized in that, Comprising the battery cell according to any one of claims 1 to 14.

16. An electrical device, characterized in that, Comprising the battery device as described in claim 15, the battery device being used to provide electrical energy.

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