Battery device, electric equipment and energy storage equipment

Abstract

The utility model discloses a battery device, electric equipment and energy storage equipment. The battery device comprises a battery monomer assembly, a box body and a limiting piece, the battery cell assembly includes a plurality of battery cells arranged in a first direction. The box body comprises a first box body and a second box body, the first box body and the second box body are mutually buckled and connected and jointly define a containing space, the battery monomer assembly is located in the containing space, and the height direction of the box body intersects with the first direction. The limiting piece is located on the side, facing the battery single bodies, of the first box body, the limiting piece is connected with the first box body, a battery single body assembly is arranged between the limiting piece and the bottom wall of the second box body, and the limiting piece and the second box body jointly restrain the multiple battery single bodies. The limiting piece is arranged on the first box body, so that the space between the first box body and the limiting piece is reduced, and the volume energy density of the whole battery device is improved; and meanwhile, the situation that internal parts of the battery device are loosened or damaged due to vibration can be reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery device, electrical equipment, and energy storage device. Background Technology

[0002] In the field of battery technology, with the continuous development of applications such as electric vehicles and energy storage systems, the demand for higher volumetric energy density in batteries is increasing. Higher volumetric energy density means that batteries can store more energy in a limited space, which is crucial for improving the performance of electric vehicles, such as driving range, and optimizing the efficiency of energy storage systems.

[0003] In environments with vibration or other disturbances, a low battery frequency (natural frequency) can easily lead to connection failures in some battery components, affecting the reliability and stability of battery operation. Therefore, improving the battery's frequency has become a pressing technical problem that needs to be solved. Utility Model Content

[0004] In view of the above problems, this application provides a battery device, electrical equipment and energy storage device, in which the limiting member is integrated into the housing.

[0005] In a first aspect, this application provides a battery device, comprising:

[0006] A battery cell assembly, comprising a plurality of battery cells arranged along a first direction;

[0007] The housing includes a first housing and a second housing, which are interlocked and connected to each other and together define an accommodating space. The battery cell assembly is located within the accommodating space, and the height direction of the housing intersects with the first direction.

[0008] A limiting member is located on the side of the first housing facing the battery cell. The limiting member is connected to the first housing. A battery cell assembly is provided between the limiting member and the bottom wall of the second housing. The limiting member and the second housing together constrain multiple battery cells.

[0009] By setting the limiting member on the first housing and connecting the limiting member to the first housing, an integral structure can be formed to constrain multiple battery cells, enhance the main frequency of the battery device, reduce the possibility of loosening or damage to the internal components of the battery device due to vibration, and enhance the resistance of the battery cells when they expand, so that the battery device can work more stably.

[0010] In some embodiments, the connection between the limiting member and the first housing includes abutment, adhesive, or locking connections. Thus, the first housing can constrain the battery cells via the limiting member in various ways, increasing the flexibility of the connection method.

[0011] In some embodiments, the limiting member includes a composite material member.

[0012] Composite components can reduce the weight of battery devices and have higher strength. They can better withstand the expansion force of individual battery cells during charging and discharging, thus fixing the position of the individual battery cells in the casing. They can also buffer the energy of the battery device under vibration and impact through their own deformation, reducing the damage to the individual battery cells.

[0013] In some embodiments, the housing further includes a constraint component. The first housing has a first connecting hole, and the limiting component has a second connecting hole. Part of the constraint component is located in the first connecting hole, and part of the constraint component is located in the second connecting hole. Along the height direction of the housing, the constraint component is used to constrain the limiting component to the first housing.

[0014] The first and second connecting holes provide a precise positioning reference for the constraint component, enabling the limiting component to quickly and accurately reach the predetermined position during assembly with the first housing, thus facilitating the constraint of multiple battery cells.

[0015] In some embodiments, the constraint component includes:

[0016] The first constraint member, a portion of which is located within the first connecting hole, has a first constraint portion;

[0017] The second constraint member, part of which is located in the second connecting hole, is connected to the first constraint member and has a second constraint portion. The first constraint portion and the second constraint portion together constrain the limiting member to the first housing.

[0018] The first and second constraint components are matched one-to-one with the first and second connecting holes. This structural design makes the installation of the constraint components more convenient and facilitates precise positioning during assembly.

[0019] In some embodiments, the first constraint member includes a first cylindrical portion connected to the first constraint portion, at least a portion of the first cylindrical portion being located within a first connecting hole, one end of the second constraint member being located within the first cylindrical portion, the first cylindrical portion and the second constraint portion clamping the limiting member, and one end of the second constraint member being configured to abut against the first constraint portion.

[0020] Along the height direction of the housing, the distance between the end of the second constraint member and the first constraint member can be adjusted during installation according to the position of the second constraint member relative to the first constraint member, so as to reduce the situation where the clamping force of the first cylindrical part and the second constraint member is too large and the limiting member is damaged.

[0021] In some embodiments, the second constraint member includes a second cylindrical portion connected to the second cylindrical portion, one end of the first constraint member is located inside the second cylindrical portion, the second cylindrical portion and the first constraint portion clamp the first housing, and the second constraint portion is configured to abut against one end of the first constraint member.

[0022] Therefore, the relative position between the second cylindrical part and the first restraining part can be adjusted along the height direction of the box, reducing the possibility of damage to the first box caused by excessive clamping force between the second cylindrical part and the first restraining part.

[0023] In some embodiments, a groove is provided on the side of the first housing away from the second housing, the groove extends along a first direction, the wall of the groove is constructed as a protrusion on the side of the first housing facing the second housing, and a first connecting hole is located on the bottom wall of the groove.

[0024] The groove increases the structural strength of the first housing, reducing the possibility of loosening or damage to internal components of the battery device due to vibration. It also improves the constraint force on the individual battery cells, enhances the resistance to expansion of the individual battery cells, and enables the battery device to operate more stably. At the same time, the groove provides better installation space for the constraint components, reducing the protrusion of the constraint components from the groove opening of the first housing. This allows the housing to be installed and fixed in situations where height is limited, thus increasing the applicability of the battery device.

[0025] In some embodiments, the housing further includes a first seal, the limiting member being sealed to the first housing via the first seal, and the first seal being disposed around the restraining member; and / or, the housing further includes a second seal, the limiting member being sealed to the second housing via the second seal, and the second seal being disposed around the restraining member.

[0026] The sealing components effectively prevent external moisture, dust, and other impurities from entering the battery device, thereby reducing the impact of moisture and dust on the internal components and improving the reliability and lifespan of the battery device.

[0027] In some embodiments, the second housing includes structural beams, and structural beams are respectively provided on both sides of the battery cell assembly along the first direction. The battery device also includes a first locking member. Along the height direction of the housing, the constraint member is provided with a connecting through hole. The structural beams are connected to the constraint member through the first locking member, and part of the first locking member is located in the connecting through hole.

[0028] The first locking component connects the restraint component to the structural beam of the second housing, enhancing the structural strength and integrity of the entire housing. This makes the battery cell assembly more securely fixed within the housing space, reducing the possibility of internal components loosening or being damaged due to vibration, and enabling the battery device to operate more stably.

[0029] In some embodiments, the housing further includes a reinforcing member that extends along a first direction and is located on the side of the first housing opposite to the second housing. The reinforcing member has a third connecting hole, and a portion of the constraint member is located within the third connecting hole. The constraint member constrains the reinforcing member to the first housing.

[0030] The reinforcement further enhances the structural strength of the first housing, thereby improving the constraint on the battery cells, increasing their resistance to expansion, and reducing the possibility of internal components loosening or being damaged due to vibration, thus enabling the battery device to operate more stably. At the same time, compared with the traditional method of embedding the reinforcement within the housing space, it can reduce the space occupied by the housing, allowing the battery cells to be made larger without changing the height of the housing, thereby increasing the volumetric energy density of the battery device.

[0031] In some embodiments, an adhesive layer is provided between the reinforcing member and the first housing, the adhesive layer being used to bond the reinforcing member and the first housing.

[0032] The adhesive layer enhances the connection strength between the reinforcing member and the first housing, reducing the possibility of loosening or damage to the internal components of the battery device due to vibration, and improving the constraint on the individual battery cells, thus increasing the resistance of the individual battery cells to expansion and enabling the battery device to operate more stably.

[0033] In some embodiments, the limiting member is connected to a plurality of battery cells, each battery cell including a housing, the housing having electrode terminals on the side facing the first housing, and the projection of the limiting member onto the first housing is located outside the projection of the electrode terminals onto the first housing along the height direction of the housing.

[0034] This allows the limiting component to avoid the electrode terminals, facilitating the electrical connection between the electrode terminals and the conductive components inside the battery device.

[0035] In some embodiments, the housing has a pressure relief mechanism on the side facing the first housing. The pressure relief mechanism is actuated to release the internal pressure of the battery cell when the internal pressure or temperature of the battery cell reaches a predetermined threshold. The projection of the limiting member on the first housing is outside the projection of the pressure relief mechanism on the first housing.

[0036] Therefore, when a battery cell experiences thermal runaway, the limiting component does not hinder the depressurization of the battery cell, thereby improving the safety of the battery device.

[0037] In some embodiments, the limiting member is bonded to the casing of different battery cells.

[0038] The limiting component is bonded to the outer shell of different battery cells. During the expansion of multiple battery cells along the height direction of the box, the limiting component can provide better constraint force for multiple battery cells, so as to reduce the failure of electrical connection of conductive parts in the battery device caused by different expansion amounts of different battery cells, and improve the reliability of the battery device. At the same time, it increases the main frequency (natural frequency) of the battery device, reducing the possibility of loosening or damage to internal components of the battery device due to vibration.

[0039] In some embodiments, there are multiple battery cell assemblies, which are arranged along a second direction. Each pair of adjacent battery cell assemblies has a corresponding limiting member, and the same limiting member constrains the battery cells of the two adjacent battery cell assemblies. The second direction intersects with the first direction, and the plane in which the second direction and the first direction are located intersects with the height direction of the housing.

[0040] Two adjacent battery cells are constrained by a limiting member, so that multiple battery cells can form an integral structure. This improves the constraint of the limiting member on multiple battery cells, while reducing the number of limiting members used, thereby improving assembly efficiency.

[0041] Secondly, this application provides an electrical device, including the battery device of the first aspect, which is used to provide electrical energy to the electrical device.

[0042] Since the electrical equipment includes all the technical features of the battery device in the first aspect, and its effect is the same as described above, it will not be repeated here.

[0043] Thirdly, this application provides an energy storage device, including a cabinet and at least one battery cluster, the battery cluster being housed within the cabinet, the battery cluster including a plurality of battery devices according to the first aspect.

[0044] Since the energy storage device includes all the technical features of the battery device in the first aspect, and its effect is the same as described above, it will not be repeated here.

[0045] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0046] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0047] Figure 1 This is an isometric view of a battery device according to some embodiments of this application;

[0048] Figure 2 This is a top view of a battery device according to some embodiments of this application;

[0049] Figure 3A and Figure 4A They are respectively Figure 2 AA cross-sectional views of different embodiments of the battery device;

[0050] Figure 3B for Figure 3A A magnified view of a portion of point I;

[0051] Figure 4B for Figure 4A A magnified view of section II;

[0052] Figure 5 for Figure 2 A BB cross-sectional view of an embodiment of the battery device;

[0053] Figure 6 for Figure 5 A magnified view of section III;

[0054] Figure 7 This is an isometric view of a battery device according to some embodiments of this application;

[0055] Figure 8 This is a top view of a battery device according to some embodiments of this application;

[0056] Figure 9A and Figure 10A They are respectively Figure 8 CC cross-sectional views of different embodiments of the battery device;

[0057] Figure 9B for Figure 9A A magnified view of section IV;

[0058] Figure 10B for Figure 10A A magnified view of part V;

[0059] Figure 11 This is a structural diagram of an electrical device used in a vehicle, as described in this application;

[0060] Figure 12 This is an isometric view of an energy storage device according to this application.

[0061] The reference numerals in the detailed embodiments are as follows:

[0062] 1000, vehicle; 200, controller; 300, motor;

[0063] 100. Battery device;

[0064] 10. Battery cell assembly; 11. Battery cell; 111. Housing; 1111. Electrode terminals; 1112. Pressure relief mechanism;

[0065] 20. Box body; 21. First box body; 211. Groove; 212. Protrusion; 213. First connecting hole; 22. Second box body; 221. Structural beam; 23. Constraint component; 231. First constraint member; 2311. First constraint part; 2312. First cylindrical part; 232. Second constraint member; 2321. Second constraint part; 2322. Second cylindrical part; 24. First sealing element; 25. Second sealing element; 26. Reinforcing element; 261. Third connecting hole; 27. Adhesive layer;

[0066] 30. Limiting component; 31. Second connecting hole;

[0067] 40. First locking component;

[0068] 2000, Energy storage equipment; 2100, Cabinet; 2200, Battery cluster;

[0069] X, first direction; Y, second direction; Z, altitude direction. Detailed Implementation

[0070] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0072] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0073] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0074] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0075] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0076] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0077] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0078] In environments with vibration, a low battery frequency (natural frequency) can easily lead to connection failures in some battery components, affecting the reliability and stability of battery operation. Therefore, improving the battery frequency has become a pressing technical problem. For example, as an electrical connector between two adjacent battery cells, the busbar inside the battery may experience connection failures between adjacent battery cells during vibration or expansion.

[0079] In view of this, this application provides a battery device that, by setting a limiting member on a first housing and connecting the limiting member to the first housing, can form an integral structure to constrain multiple battery cells, enhance the main frequency of the battery device, reduce the possibility of loosening or damage to internal components of the battery device due to vibration, and enhance the resistance of battery cells when they expand, so that the battery device can work more stably.

[0080] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0081] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0082] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0083] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0084] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0085] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0086] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to house the battery cell assembly.

[0087] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0088] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0089] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices, such as electric vehicles, cars, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0090] In some embodiments, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0091] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0092] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of a single battery cell, active ions, such as lithium ions, repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0093] 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.

[0094] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0095] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer fiber layer and a metal layer. The composite current collector can be formed by forming metal materials such as aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys on a polymer substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.

[0096] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, lithium iron phosphate (such as LiFePO4). 4，It can also be abbreviated as LFP), lithium iron phosphate and carbon composite materials, lithium manganese phosphate (such as LiMnPO4), etc. 4） At least one of lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxides (such as LiCoO2). 2） Lithium nickel oxides (such as LiNiO) 2） Lithium manganese oxides (such as LiMnO2, LiMn2O) 4） Lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi) 1 / 3 Co 1 / 3 Mn 1 / 3 O 2， It can also be abbreviated as NCM 333 LiNi 0.5 Co 0.2 Mn 0.3 O 2， It can also be abbreviated as NCM 523 LiNi 0.5 Co 0.25 Mn 0.25 O 2， It can also be abbreviated as NCM 211 LiNi 0.6 Co 0.2 Mn 0.2 O 2， It can also be abbreviated as NCM 622 LiNi 0.8 Co 0.1 Mn 0.1 O 2， It can also be abbreviated as NCM 811） Lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 O 2） At least one of the above-mentioned substances and their modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0097] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0098] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0099] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer fiber layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0100] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0101] As an example, the negative electrode current collector has two surfaces opposite each other in its own 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.

[0102] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. 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, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional 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.

[0103] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0104] As an example, negative electrode active materials can be filled and / or deposited within the negative electrode current collector.

[0105] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0106] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0107] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0108] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without 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 single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0109] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0110] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0111] Liquid electrolytes include electrolyte salts and solvents.

[0112] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0113] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0114] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0115] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0116] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0117] As an example, the polymers of polymeric solid electrolytes may include polyether polyethylene oxide, polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0118] As an example, inorganic solid electrolytes can be oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor lithium germanium phosphosulfur, silver sulfide germanium, amorphous sulfides, as well as one or more of halide solid electrolytes, nitride solid electrolytes and hydride solid electrolytes).

[0119] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0120] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0121] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0122] In some embodiments, the electrode assembly has a stacked structure.

[0123] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0124] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0125] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0126] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0127] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0128] In some embodiments, the electrode assembly may be cylindrical, flat, or polygonal in shape.

[0129] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0130] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), or a composite metal casing (such as a copper-aluminum composite casing). In some embodiments, the casing may be a sealed structure or an unsealed structure.

[0131] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries (multi-prismatic batteries are, for example, hexagonal prismatic batteries). This application does not have any particular limitations.

[0132] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also be provided with one or more.

[0133] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0134] In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0135] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of a battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby creating an opening or channel for the internal pressure or temperature to be released. The design of this threshold varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0136] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0137] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0138] The term "actuation" as used in this application refers to the activation or actuation of the pressure relief mechanism to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the mechanism, etc. When the pressure relief mechanism is activated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the activated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0139] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for venting gas inside the battery cell.

[0140] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0141] For ease of explanation, please refer to the following examples. Figure 1 - Figure 10B The following description will be based on a battery device 100 according to some embodiments of this application.

[0142] Please refer to Figure 1 - Figure 6 The battery device 100 includes a battery cell assembly 10, a housing 20, and a limiting member 30. The battery cell assembly 10 includes a plurality of battery cells 11 arranged along a first direction X. The housing 20 includes a first housing 21 and a second housing 22, which are interlocked and jointly define an accommodating space. The battery cell assembly 10 is located within this accommodating space, and the height direction Z of the housing 20 intersects the first direction X. The limiting member 30 is located on the side of the first housing 21 facing the battery cells 11. The limiting member 30 is connected to the first housing 21, and the battery cell assembly 10 is disposed between the bottom walls of the limiting member 30 and the second housing 22. The limiting member 30 and the second housing 22 together constrain the plurality of battery cells 11.

[0143] The connection between the first housing 21 and the second housing 22 includes, but is not limited to, snap-fit, bolt connection or riveting.

[0144] The limiting component 30 can be made of metal or non-metal.

[0145] The connection between the limiting member 30 and the first housing 21 includes, but is not limited to, bonding, welding, riveting, or bolting.

[0146] "Constraint" refers to the restriction and fixation of the battery cell 11 in spatial position.

[0147] As an example, the limiting member 30 is a composite material strip. The length direction of the composite material strip is the same as the first direction X. The size of the composite material strip along the first direction X is larger than the size of the battery cell assembly 10 along the first direction X. The two ends of the limiting member 30 are connected to the second housing 22.

[0148] By setting the limiting member 30 on the first housing 21, the space between the first housing 21 and the limiting member 30 can be reduced while keeping the height of the housing 20 unchanged. This allows a larger battery cell 11 to be accommodated within the same space of the housing 20, thereby increasing the volumetric energy density of the entire battery device 100. At the same time, connecting the limiting member 30 to the first housing 21 forms an integral structure that constrains multiple battery cells 11, reducing the possibility of loosening or damage to internal components of the battery device 100 due to vibration. It also improves the constraint on the battery cells 11, enhances the resistance of the battery cells 11 to expansion, and enables the battery device 100 to work more stably.

[0149] In some embodiments, the connection between the limiting member 30 and the first housing 21 includes abutment, adhesion, or locking connection. Thus, the first housing 21 can constrain the battery cell 11 through the limiting member 30 in various ways, increasing the flexibility of the connection method.

[0150] In some embodiments, the limiting member 30 includes a composite material.

[0151] Composite parts can be, but are not limited to, composite parts formed by glass fiber and resin, composite parts formed by carbon fiber and resin matrix, composite parts formed by aramid fiber and resin, etc.

[0152] Composite components can reduce the weight of the battery device and have higher strength. Using composite components can better withstand the expansion force of the battery cell 11 during charging and discharging, so as to fix the position of the battery cell 11 in the box. They can also buffer the energy of the battery device 100 under vibration and impact through their own deformation, thereby reducing the damage to the battery cell 11.

[0153] In some embodiments, please refer to Figure 3B and Figure 4B The housing 20 also includes a constraint component 23. The first housing 21 has a first connecting hole 213, and the limiting member 30 has a second connecting hole 31. Part of the constraint component 23 is located in the first connecting hole 213, and part of the constraint component 23 is located in the second connecting hole 31. Along the height direction Z of the housing 20, the constraint component 23 is used to constrain the limiting member 30 to the first housing 21. The constraint component 23 includes, but is not limited to, rivets or combinations of screws and nuts.

[0154] The first connecting hole 213 and the second connecting hole 31 provide a precise positioning reference for the constraint component 23, enabling the limiting component 30 to quickly and accurately reach the predetermined position during the assembly process with the first housing 21, so as to facilitate the constraint of multiple battery cells 11.

[0155] In some embodiments, please refer to Figure 3B and Figure 4B The constraint component 23 includes a first constraint member 231 and a second constraint member 232. A portion of the first constraint member 231 is located within the first connecting hole 213, and the first constraint member 231 has a first constraint portion 2311. A portion of the second constraint member 232 is located within the second connecting hole 31. The first constraint member 231 and the second constraint member 232 are connected, and the second constraint member 232 has a second constraint portion 2321. The first constraint portion 2311 and the second constraint portion 2321 together constrain the limiting member 30 to the first housing 21.

[0156] The connection between the first constraint member 231 and the second constraint member 232 can be a threaded connection, or they can be inserted in an interference fit manner, etc.

[0157] As an example, at least one of the first constraint member 231 and the second constraint member 232 can be a sleeve structure.

[0158] The first constraint member 231 and the second constraint member 232 correspond one-to-one with the first connecting hole 213 and the second connecting hole 31. This structural design makes the installation of the constraint member 23 more convenient and facilitates precise positioning during assembly.

[0159] In some embodiments, please refer to Figure 3B The first constraint member 231 includes a first cylindrical portion 2312, which is connected to the first constraint portion 2311. At least a portion of the first cylindrical portion 2312 is located inside the first connecting hole 213. One end of the second constraint member 232 is located inside the first cylindrical portion 2312. The first cylindrical portion 2312 and the second constraint portion 2321 clamp the limiting member 30. One end of the second constraint member 232 is configured to abut against the first constraint portion 2311.

[0160] The connection between the first cylindrical part 2312 and the first restraining part 2311 can be welding, threaded connection or integral molding, etc.

[0161] During assembly, one end of the second constraint member 232 can abut against the first constraint part 2311, or it can be spaced apart from the first constraint part 2311.

[0162] Along the height direction Z of the housing 20, the distance between the end of the second constraint member 232 and the first constraint part 2311 can be adjusted during installation according to the position of the second constraint member 232 relative to the first constraint member 231. This reduces the possibility of damage to the limiting member 30 caused by excessive clamping force of the first cylindrical part 2312 and the second constraint part 2321.

[0163] In some embodiments, please refer to Figure 4B The second constraint member 232 includes a second cylindrical portion 2322, a second constraint portion 2321 connected to the second cylindrical portion 2322, one end of the first constraint member 231 located inside the second cylindrical portion 2322, the second cylindrical portion 2322 and the first constraint portion 2311 clamp the first housing 21, and the second constraint portion 2321 is configured to abut against one end of the first constraint member 231.

[0164] The connection between the second constraint part 2321 and the second cylindrical part 2322 can be welding, threaded connection or integral molding, etc.

[0165] Therefore, the relative position between the second cylindrical part 2322 and the first constraint part 2311 can be adjusted along the height direction Z of the housing 20, reducing the possibility of damage to the first housing 21 caused by excessive clamping force between the second cylindrical part 2322 and the first constraint part 2311.

[0166] In some embodiments, please refer to Figure 3B and Figure 4B The first housing 21 has a groove 211 on the side away from the second housing 22. The groove 211 extends along the first direction X. The wall of the groove 211 is constructed as a protrusion 212 on the side of the first housing 21 facing the second housing 22. The first connecting hole 213 is located on the bottom wall of the groove 211.

[0167] The shape of the cross-section of the groove 211 can be, but is not limited to, rectangular, U-shaped or semi-circular, etc., and is not specifically limited here.

[0168] The groove 211 can be made by stamping to form an externally concave and internally convex structure on the first housing 21.

[0169] The groove 211 can increase the structural strength of the first housing 21, thereby reducing the possibility of loosening or damage to the internal components of the battery device 100 due to vibration, and can also increase the constraint force on the battery cells 11, enhance the resistance of the battery cells 11 to expansion, and enable the battery device 100 to work more stably. At the same time, the groove 211 provides better installation space for the constraint component 23, and can reduce the protrusion of the constraint component 23 from the groove 211 of the first housing 21, so that the housing 20 can be installed and fixed in situations where the height is limited, thereby improving the applicability of the battery device 100.

[0170] In some embodiments, please refer to Figure 3B and Figure 4B The housing 20 further includes a first sealing member 24, and the limiting member 30 is sealed to the first housing 21 through the first sealing member 24, and the first sealing member 24 is arranged around the restraining member 23; and / or, the housing 20 further includes a second sealing member 25, and the limiting member 30 is sealed to the second housing 22 through the second sealing member 25, and the second sealing member 25 is arranged around the restraining member 23.

[0171] The first sealing element 24 can be a sealing ring or a sealing adhesive layer. The second sealing element 25 can be a sealing ring or a sealing adhesive layer.

[0172] For example, both the first seal 24 and the second seal 25 can be sealing adhesive layers. During assembly, adhesive can be applied between the mating surfaces of the limiting member 30 and the first housing 21, and between the limiting member 30 and the second housing 22. The adhesive surrounds the restraining member 23, and after the adhesive solidifies, a sealing adhesive layer is formed. In other examples, one of the first seal 24 and the second seal 25 is a sealing ring, and the other is a sealing adhesive layer. The first seal 24 and the second seal 25 can also both be sealing rings. To improve sealing performance, sealing grooves can be provided on one of the mating surfaces of the limiting member 30 and the first housing 21, and on one of the mating surfaces of the limiting member 30 and the second housing 22, respectively, and the sealing ring can be placed in the corresponding sealing groove.

[0173] The sealing element effectively prevents external moisture, dust and other impurities from entering the battery device 100, thereby reducing the impact of moisture and dust on the internal components of the battery device 100 and improving the reliability and service life of the battery device 100.

[0174] In some embodiments, please refer to Figure 3A and 3B The second housing 22 includes structural beams 221. The battery cell assembly 10 is provided with structural beams 221 on both sides along the first direction X. The battery device 100 also includes a first locking member 40. Along the height direction Z of the housing 20, the constraint member 23 is provided with a connecting through hole. The structural beams 221 are connected to the constraint member 23 through the first locking member 40, and part of the first locking member 40 is located in the connecting through hole.

[0175] The first locking element 40 can be any combination of a screw and a nut, or a combination of a screw and a bolt and a nut.

[0176] For example, the first locking member 40 can be a screw, with one end of the first locking member 40 passing through the connecting through hole and threadedly connected to the structural beam 221. In other examples, the screw can be replaced by a threaded rod, with one end of the threaded rod welded or threadedly connected to the structural beam 221, and the other end of the threaded rod extending out of the connecting through hole from the outside of the housing 20 and threadedly connected to a nut.

[0177] The structural beam 221 can be an expansion beam inside the second box 22 to bear the expansion force between the battery cells 11, or it can be a side beam of the second box 22.

[0178] The first locking member 40 connects the constraint member 23 to the structural beam 221 of the second housing 22, which enhances the structural strength and integrity of the entire housing 20, making the battery cell assembly 10 more securely fixed in the housing space. This reduces the possibility of the battery device 100's internal components becoming loose or damaged due to vibration, and enables the battery device 100 to work more stably.

[0179] In some embodiments, please refer to Figure 7 - Figure 10B The housing 20 also includes a reinforcing member 26, which extends along the first direction X. The reinforcing member 26 is located on the side of the first housing 21 away from the second housing 22. The reinforcing member 26 is provided with a third connecting hole 261. Part of the restraining member 23 is located in the third connecting hole 261. The restraining member 23 restrains the reinforcing member 26 to the first housing 21.

[0180] The reinforcing member 26 can be, but is not limited to, a steel strip, or other materials such as a carbon fiber strip.

[0181] As an example, the reinforcing member 26 may be disposed in the groove 211 of the first housing 21 in the above embodiment.

[0182] As an example, the reinforcing member 26 is a steel strip. The length direction of the steel strip is the same as the first direction X. The size of the composite strip along the first direction X is larger than the size of the battery cell assembly 10 along the first direction X. The two ends of the steel strip are connected to the first housing 21.

[0183] The reinforcement 26 further enhances the structural strength of the first housing 21, thereby improving the constraint on the battery cell 11, increasing the resistance of the battery cell 11 to expansion, and reducing the possibility of loosening or damage to the internal components of the battery device 100 due to vibration, thus enabling the battery device 100 to operate more stably. At the same time, compared with the traditional method of embedding the reinforcement 26 inside the housing space, it can reduce the space occupied by the housing 20, and without changing the height of the housing 20, the volume of the battery cell 11 can be made larger, thereby increasing the volumetric energy density of the battery device 100.

[0184] In some embodiments, please refer to Figure 9B and Figure 10B An adhesive layer 27 is provided between the reinforcing member 26 and the first housing 21, and the adhesive layer 27 is used to bond the reinforcing member 26 and the first housing 21.

[0185] The adhesive layer 27 enhances the connection strength between the reinforcing member 26 and the first housing 21, thereby reducing the possibility of loosening or damage to the internal components of the battery device 100 due to vibration, and improving the constraint on the battery cell 11, enhancing the resistance of the battery cell 11 to expansion, so that the battery device 100 can work more stably.

[0186] In some embodiments, please refer to Figure 5 and Figure 6 The limiting member 30 is connected to a plurality of battery cells 11 respectively. The battery cell 11 includes a housing 111. The housing 111 has an electrode terminal 1111 on the side facing the first housing 21. Along the height direction Z of the housing 20, the projection of the limiting member 30 on the first housing 21 is outside the projection of the electrode terminal 1111 on the first housing 21.

[0187] The connection between the limiting component 30 and the battery cell 11 includes, but is not limited to, bonding, screw connection or riveting.

[0188] Therefore, the limiting member 30 can be made to avoid the electrode terminal 1111, so as to facilitate the electrical connection between the electrode terminal 1111 and the conductive member inside the battery device 100.

[0189] In some embodiments, please refer to Figure 5 and Figure 6 The outer casing 111 has a pressure relief mechanism 1112 on the side facing the first housing 21. The pressure relief mechanism 1112 is actuated to release the internal pressure of the battery cell 11 when the internal pressure or temperature of the battery cell 11 reaches a predetermined threshold. The projection of the limiting member 30 on the first housing 21 is outside the projection of the pressure relief mechanism 1112 on the first housing 21.

[0190] Therefore, when thermal runaway occurs in the battery cell 11, the limiting member 30 does not hinder the depressurization of the battery cell 11, thereby improving the safety of the battery device 100. In other examples, a depressurization mechanism 1112 is provided on the side wall or bottom wall of the housing 111 facing the second housing 22.

[0191] In some embodiments, the limiting member 30 is bonded to the housing 111 of the different battery cells 11.

[0192] The limiting member 30 is bonded to the outer shell 111 of different battery cells 11. During the expansion of multiple battery cells 11 along the height direction Z of the housing 20, the limiting member 30 can provide better constraint force for multiple battery cells 11, so as to reduce the failure of electrical connection of conductive parts in the battery device 100 caused by different expansion amounts of different battery cells 11, and improve the reliability of the battery device 100. At the same time, it increases the main frequency (natural frequency) of the battery device 100, and reduces the possibility of loosening or damage of internal parts of the battery device 100 due to vibration.

[0193] In some embodiments, please refer to Figure 5 and Figure 6 There are multiple battery cell modules 10, which are arranged along the second direction Y. Each pair of adjacent battery cell modules 10 has a corresponding limiting member 30. The same limiting member 30 constrains the battery cells 11 of the two adjacent battery cell modules 10. The second direction Y intersects with the first direction X. The plane where the second direction Y and the first direction X are located intersects with the height direction Z of the housing 20.

[0194] Figure 5 An example is shown with five battery cell modules 10. The number of battery cell modules 10 can be set as needed and is not specifically limited here.

[0195] Two adjacent battery cell modules 10 are constrained by a limiting member 30, so that multiple battery cell modules 10 form an integral structure, thereby improving the constraint of the limiting member 30 on multiple battery cell modules 10 and reducing the number of limiting members 30 used to improve assembly efficiency.

[0196] For ease of explanation, the following embodiments use an electrical device from some embodiments of this application as an example.

[0197] The electrical equipment includes the battery device 100 of the above embodiments, which is used to provide electrical energy to the electrical equipment.

[0198] Electrical equipment can include, but is not limited to, electric vehicles, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0199] Figure 11 This is a schematic diagram of the structure of a vehicle 1000, used as an electrical device in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 also includes a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0200] Since the electrical equipment includes all the technical features of the battery device 100 in the above embodiments, the effect is the same as described above, and will not be repeated here.

[0201] For ease of explanation, please refer to the following examples. Figure 12 The following description will be based on an energy storage device 2000 according to some embodiments of this application.

[0202] The energy storage device 2000 includes a cabinet 2100 and at least one battery cluster 2200, which is housed within the cabinet 2100. The battery cluster 2200 includes a plurality of battery devices 100 as described in the above embodiments.

[0203] The energy storage device 2000 includes a cabinet 2100 and a battery cluster 2200, which is housed within the cabinet 2100. The battery cluster 2200 includes a plurality of battery devices 100 as described in the above embodiments.

[0204] Battery clusters 2200 can increase the voltage and capacity of energy storage device 2000. Battery clusters 2200 may include multiple battery units 100. The multiple battery units 100 are connected in series via a busbar to increase the voltage of energy storage device 2000. When energy storage device 2000 includes multiple battery clusters 2200, the multiple battery clusters 2200 are connected in parallel to increase the capacity of energy storage device 2000.

[0205] The energy storage device 2000 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device 2000 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 2000 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires the energy storage device 2000.

[0206] Since the energy storage device 2000 includes all the technical features of the battery device 100 in the above embodiments, and has the same effect as described above, it will not be repeated here.

[0207] In a first optional embodiment of the battery device, the battery device 100 includes a housing 20, a limiting member 30, and a plurality of battery cell assemblies 10. Each battery cell assembly 10 includes a plurality of battery cells 11 arranged along a first direction X. The housing 20 includes a first housing 21, a second housing 22, a first seal 24, a second seal 25, a reinforcing member 26, and a first locking member 40. The first housing 21 and the second housing 22 are interlocked and jointly define an accommodating space, within which the battery cell assemblies 10 are located. The height direction Z of the housing 20 intersects the first direction X. The limiting member 30 is located on the side of the first housing 21 facing the battery cell 11. The limiting member 30 is connected to the first housing 21. A battery cell assembly 10 is provided between the limiting member 30 and the bottom wall of the second housing 22. Multiple battery cell assemblies 10 are arranged along the second direction Y. Each pair of adjacent battery cell assemblies 10 corresponds to a limiting member 30. The same limiting member 30 constrains the battery cells 11 of the two adjacent battery cell assemblies 10. The second direction Y intersects the first direction X. The plane containing the second direction Y and the first direction X intersects the height direction Z of the housing 20. The limiting member 30 and the second housing 22 jointly constrain multiple battery cells 11. The housing 20 also includes a constraining member 23. The first housing 21 has a first connecting hole 213, and the limiting member 30 has a second connecting hole 31. Part of the constraining member 23 is located in the first connecting hole 213, and part of the constraining member 23 is located in the second connecting hole 31. Along the height direction Z of the housing 20, the constraining member 23 constrains the limiting member 30 to the first housing 21. The constraint component 23 includes a first constraint member 231 and a second constraint member 232. A portion of the first constraint member 231 is located within the first connecting hole 213, and the first constraint member 231 has a first constraint portion 2311. A portion of the second constraint member 232 is located within the second connecting hole 31, and the second constraint member 232 has a second constraint portion 2321. The first constraint portion 2311 and the second constraint portion 2321 together constrain the limiting member 30 to the first housing 21. The first constraint member 231 includes a first constraint portion 2311 and a first cylindrical portion 2312, one end of which is connected to the first constraint portion 2311. The second constraint member 232 includes a second constraint portion 2321 and a second cylindrical portion 2322, one end of which is connected to the second constraint portion 2321. The first cylindrical portion 2312 and the second cylindrical portion 2322 are inserted together in an interference fit. The first housing 21 has a groove 211 on the side opposite to the second housing 22. The groove 211 extends along the first direction X. The wall of the groove 211 is constructed as a protrusion 212 on the side of the first housing 21 facing the second housing 22. The first connecting hole 213 is located on the bottom wall of the groove 211. The limiting member 30 is sealed to the first housing 21 by the first sealing member 24, and the first sealing member 24 is arranged around the restraining member 23. The limiting member 30 is sealed to the second housing 22 by the second sealing member 25, and the second sealing member 25 is arranged around the restraining member 23.The second housing 22 includes structural beams 221. Structural beams 221 are respectively provided on both sides of the battery cell assembly 10 along the first direction X. The battery device 100 also includes a first locking member 40. Along the height direction Z of the housing 20, a constraint member 23 has a connecting through hole. The structural beams 221 are connected to the constraint member 23 through the first locking member 40, and a portion of the first locking member 40 is located within the connecting through hole. A reinforcing member 26 extends along the first direction X and is located on the side of the first housing 21 opposite to the second housing 22. At least a portion of the reinforcing member 26 is located within a groove 211. The reinforcing member 26 has a third connecting hole 261, and a portion of the constraint member 23 is located within the third connecting hole 261. The constraint member 23 constrains the reinforcing member 26 to the first housing 21. An adhesive layer 27 is provided between the reinforcing member 26 and the first housing 21 to bond the reinforcing member 26 and the first housing 21.

[0208] Please refer to Figure 3B In a second alternative embodiment of the battery device 100, unlike the first alternative embodiment, a portion of the constraint member 23 is located within the third connecting hole 261. The first cylindrical portion 2312 and the second constraint portion 2321 clamp the limiting member 30, with the second cylindrical portion 2322 abutting against the first constraint portion 2311.

[0209] Please refer to Figure 4B In a third optional embodiment of the battery device 100, unlike the first optional embodiment, the first cylindrical portion 2312 and the second constraint portion 2321 clamp the limiting member 30, the second cylindrical portion 2322 abuts against the first constraint portion 2311, and a portion of the first cylindrical portion 2312 is located inside the second connecting hole 31.

[0210] Please refer to Figure 9B In the fourth optional embodiment of the battery device 100, unlike the second and third optional embodiments, the battery device 100 further includes a reinforcing member 26, at least a portion of which is located within the groove 211, and the reinforcing member 26 is provided with a third connecting hole 261, a portion of the first cylindrical portion 2312 is located within the third connecting hole 261, and the reinforcing member 26 is bonded to the bottom wall of the groove 211 by an adhesive layer 27.

[0211] By constraining the limiting member 30 to the first housing 21 by the constraint member 23, the strength and rigidity of the first housing 21 can be improved. Simultaneously, the limiting member 30 is bonded to the outer casing 111, enhancing the constraint on the multiple battery cells 11, thereby increasing the main frequency of the battery device 100. This reduces the likelihood of internal components of the battery device 100 loosening or being damaged due to vibration, and enhances the resistance of the first housing 21 to the expansion of the battery cells 11, enabling the battery device 100 to operate more stably. The reinforcement member 26 further increases the main frequency of the battery device 100 and reduces the excessive space occupied by the reinforcement member 26 within the housing 20, thereby increasing the volumetric energy density of the battery device 100.

[0212] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery cell assembly comprises a plurality of battery cells arranged along a first direction. The box comprises a first box and a second box, which jointly define a containing space, and are connected, the battery cell assembly is located in the containing space, and the height direction of the box intersects the first direction. The limiting member is located on the side of the first box facing the battery cell, is connected with the first box, and the limiting member and the bottom wall of the second box jointly constrain the plurality of battery cells. The connection between the limiting member and the first box comprises abutting, bonding or locking connection.

2. The battery device according to claim 1, characterized by The limiting member comprises a composite member.

3. The battery device of claim 1, wherein The box further comprises a restraining component, the first box is provided with a first connecting hole, the limiting member is provided with a second connecting hole, part of the restraining component is located in the first connecting hole, and part of the restraining component is located in the second connecting hole; along the height direction of the box, the restraining component restrains the limiting member to the first box.

4. The battery device of claim 1, wherein The restraining component comprises:

5. The battery device of claim 4, wherein, The first restraining member, part of the first restraining member is located in the first connecting hole, and the first restraining member has a first restraining part; The second restraining member, part of the second restraining member is located in the second connecting hole, the first restraining member and the second restraining member are connected, the second restraining member has a second restraining part, and the first restraining part and the second restraining part jointly restrain the limiting member to the first box. The first restraining member comprises a first cylinder part, the first cylinder part is connected with the first restraining part, at least part of the first cylinder part is located in the first connecting hole, one end of the second restraining member is located in the first cylinder part, the first cylinder part and the second restraining part clamp the limiting member, and one end of the second restraining member is arranged to be capable of abutting against the first restraining part.

6. The battery device of claim 5, wherein The second restraining member comprises a second cylinder part, the second restraining part is connected with the second cylinder part, one end of the first restraining member is located in the second cylinder part, the second cylinder part clamps the first box with the first restraining part, and the second restraining part is arranged to be capable of abutting against one end of the first restraining member.

7. The battery device of claim 5, wherein The side of the first box away from the second box is provided with a groove, the groove extends along the first direction, the wall of the groove on the side of the first box facing the second box is configured to be protruding, and the first connecting hole is located on the bottom wall of the groove.

8. The battery device of claim 4, wherein The box further comprises a first sealing member, the limiting member is sealingly connected with the first box through the first sealing member, and the first sealing member surrounds the restraining component; and / or, the box further comprises a second sealing member, the limiting member is sealingly connected with the second box through the second sealing member, and the second sealing member surrounds the restraining component.

9. The battery device of claim 4, wherein, ​ 10. The battery device of claim 4, wherein The second box body comprises a structural beam, the battery cell assembly is provided with the structural beam on both sides in the first direction respectively, the battery device further comprises a first locking member, the constraint member is provided with a connecting through hole in the height direction of the box body, the structural beam is connected with the constraint member through the first locking member, and part of the first locking member is located in the connecting through hole.

11. The battery device according to any one of claims 4 to 10, wherein The box body further comprises a reinforcing member, the reinforcing member extends in the first direction, the reinforcing member is located on the side of the first box body away from the second box body, the reinforcing member is provided with a third connecting hole, and part of the constraint member is located in the third connecting hole, so that the constraint member constrains the reinforcing member to the first box body.

12. The battery device of claim 11, wherein, A glue layer is arranged between the reinforcing member and the first box body, and the glue layer is used for bonding the reinforcing member and the first box body.

13. The battery device according to any one of claims 1 to 10, wherein The limiting member is connected with the plurality of battery cells respectively, the battery cell comprises a shell, the shell is provided with an electrode terminal on the side facing the first box body, and the projection of the limiting member on the first box body is located outside the projection of the electrode on the first box body in the height direction of the box body.

14. The battery device of claim 13, wherein, The shell is provided with a pressure relief mechanism on the side facing the first box body, the pressure relief mechanism is used for actuating to release the internal pressure of the battery cell when the internal pressure or temperature of the battery cell reaches a predetermined threshold, and the projection of the limiting member on the first box body is located outside the projection of the pressure relief mechanism on the first box body.

15. The battery device of claim 13, wherein, The limiting member is bonded with the shell of different battery cells.

16. The battery device according to any one of claims 1 to 10, wherein The number of the battery cell assemblies is a plurality, the plurality of battery cell assemblies are arranged in a second direction, and each limiting member corresponds to two adjacent battery cell assemblies, the same limiting member constrains the battery cells of the two adjacent battery cell assemblies, the second direction intersects with the first direction, and the plane where the second direction and the first direction are located intersects with the height direction of the box body.

17. An electrical device, characterized by The battery device comprises the battery device according to any one of claims 1-16, and the battery device is used for providing electric energy to the electric equipment.

18. An energy storage device, comprising: The cabinet comprises a cabinet body and at least one battery cluster, the battery cluster is accommodated in the cabinet body, and the battery cluster comprises a plurality of battery devices according to any one of claims 1-16. The cabinet comprises a cabinet body and at least one battery cluster, the battery cluster is accommodated in the cabinet body, and the battery cluster comprises a plurality of battery devices according to any one of claims 1-16.

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