Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device. 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 buckled with each other and jointly define a containing space, the battery monomer assembly is located in the containing space, the first box body comprises a top wall body and a reinforcing part, and the reinforcing part is located on the side, away from the second box body, of the top wall body and connected with the top wall body; the first direction intersects with the height direction of the box body. The limiting pieces are located on the sides, facing the first box body, of the battery single body assemblies, and the top wall body restrains the multiple battery single bodies through the limiting pieces. The difference value of the swelling capacity of the plurality of battery monomers in the height direction of the box body can be reduced through the reinforcing pieces and the limiting pieces, so that the situation that electric connection parts are damaged due to the fact that the difference of the swelling capacity of different battery monomers is too large is reduced, and the working reliability of the battery device is improved.

Description

Technical Field

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

[0002] During use, the individual battery cells within the battery casing expand along the height of the casing. Because different cells expand at different rates, significant differences in expansion force can damage the electrical connections within the battery. Currently, pressure strips are installed between the casing and the battery cells to increase constraint and reduce the difference in upward expansion. However, this occupies a large amount of casing space, affecting the volumetric energy density of the casing. Utility Model Content

[0003] In view of the above problems, this application provides a battery device and an electrical device, which can reduce the situation where the upward expansion amount of multiple battery cells differs too much during the expansion process by constraining multiple battery cells by a first housing.

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

[0005] A battery cell assembly includes a plurality of battery cells arranged along a first direction;

[0006] The housing includes a first housing and a second housing, which are interlocked and together define an accommodating space. The battery cell assembly is located within the accommodating space. The first housing includes a top wall and a reinforcing member. The reinforcing member is located on the side of the top wall opposite to the second housing and is connected to the top wall. A first direction intersects with the height direction of the housing. The first housing constrains a plurality of the battery cells.

[0007] By placing the reinforcing member on the outer surface of the first housing, compared to placing the reinforcing member between the battery cell and the first housing, the internal space of the housing can be saved without changing the internal height dimension of the housing, allowing the battery cell to be made larger, thereby improving the volumetric energy density of the battery device.

[0008] In some embodiments, the battery device further includes a limiting member located on the side of the battery cell assembly facing the first housing, and the top wall constrains multiple battery cells by the limiting member.

[0009] The top wall constrains multiple battery cells through limiting components, which can reduce the difference in the expansion amount of multiple battery cells along the height direction of the box, thereby reducing the possibility of damage to electrical connection components caused by excessive difference in the expansion amount of different battery cells, and improving the reliability of the battery device.

[0010] In some embodiments, multiple battery cells are respectively bonded to a limiting member, and the limiting member is connected to the top wall.

[0011] Therefore, the limiting component can bond and fix multiple battery cells of the battery cell assembly to constrain the multiple battery cells during expansion, thereby reducing the difference in the expansion amount of the multiple battery cells, reducing the possibility of damage to the electrical connection components inside the battery device, and improving the reliability of the battery device operation.

[0012] In some embodiments, the limiting member is bonded to the top wall, and the bonding strength between the limiting member and the top wall is less than the bonding strength between the battery cell and the limiting member.

[0013] The top wall is bonded to the limiting component. During installation, the limiting component is bonded to a predetermined position on the top wall. Structural adhesive is applied to the top of the battery cells. After the first and second housings are fastened together, the limiting component is bonded to the battery cells via the structural adhesive, ensuring the limiting component is firmly attached to the battery cells at the predetermined position for easy installation. Because the bond strength between the top wall and the limiting component is less than the bond strength between the limiting component and multiple battery cells, the limiting component provides better constraint on the multiple battery cells. When disassembling the first housing, the limiting component can be bonded to the battery cells and separated from the first housing, maintaining the constraint on the multiple battery cells without needing to re-bond the limiting component to the battery cells, thus facilitating disassembly and assembly.

[0014] In some embodiments, multiple battery cells are respectively bonded to a limiting member, and the limiting member abuts against the top wall.

[0015] During disassembly and assembly, compared with the method of bonding the limiting component to the first housing, it is not necessary to overcome the adhesive force between the limiting component and the first housing to separate the first housing from the second housing, which facilitates the disassembly of the first housing. At the same time, multiple battery cells are bonded to the limiting component respectively. During the process of multiple battery cells expanding along the height direction of the housing, the limiting component can provide better restraint for multiple battery cells.

[0016] In some embodiments, the surface of the top wall facing the second housing has a protrusion, which constrains multiple battery cells by means of a limiting member.

[0017] The protrusion design can improve the strength and rigidity of the first housing. On the other hand, while keeping the distance between the top wall and the battery cell unchanged, the size of the limiting component along the height of the housing can be reduced in order to achieve the constraint of the limiting component by the top wall, thereby saving the amount of material used for the limiting component.

[0018] In some embodiments, multiple battery cells are respectively bonded to a limiting member, and the limiting member is connected to a protrusion.

[0019] Therefore, the limiting component can bond and fix multiple battery cells of the battery cell assembly to constrain the multiple battery cells during expansion, thereby reducing the difference in the expansion amount of the multiple battery cells, reducing the possibility of damage to the electrical connection components inside the battery device, and improving the reliability of the battery device operation.

[0020] In some embodiments, multiple battery cells are bonded to a limiting member, the limiting member is bonded to a protrusion, and the bonding strength between the limiting member and the protrusion is less than the bonding strength between the battery cell and the limiting member.

[0021] The protrusions are bonded to the limiting components. During installation, the protrusions serve a positioning function, facilitating the bonding of the limiting components to their predetermined positions within the first housing. After applying structural adhesive to the top of the battery cells, the limiting components are bonded to the battery cells via the adhesive when the first and second housings are fastened together. This ensures the limiting components are bonded to the battery cells in their predetermined positions, facilitating installation. When disassembling the first housing, the limiting components can be bonded to the battery cells and separated from the first housing. This maintains the constraint of the limiting components on multiple battery cells without requiring re-bonding, simplifying assembly and disassembly.

[0022] In some embodiments, multiple battery cells are respectively bonded to a limiting member, and the limiting member abuts against a protrusion.

[0023] During disassembly and assembly, compared with the method of bonding the limiting component to the first housing, it is not necessary to overcome the adhesive force between the limiting component and the first housing to separate the first housing from the second housing, which facilitates the disassembly of the first housing. At the same time, multiple battery cells are bonded to the limiting component respectively. During the process of multiple battery cells expanding along the height direction of the housing, the limiting component can provide better restraint for multiple battery cells.

[0024] In some embodiments, the surface of the top wall facing away from the second housing has a groove extending in a first direction, and a reinforcement is located in the groove. The groove includes a bottom wall and a side wall. On the surface of the top wall facing the battery cell, the bottom wall and at least a portion of the side wall are configured to form protrusions.

[0025] The groove design allows for the placement of reinforcing members on the outside of the housing without altering its height. It also provides constraint to the first housing as the battery cells expand along the height of the housing, thereby increasing its strength and rigidity, reducing deformation, and enhancing its resistance to impacts and collisions, thus better protecting the battery cell assembly.

[0026] In some embodiments, there are multiple limiting members, which are spaced apart along the second direction. Each limiting member corresponds to a groove. The bottom wall is bonded to or abuts against the limiting member. The second direction intersects with the first direction. The plane containing the second direction and the first direction intersects with the height direction of the box.

[0027] Multiple limiting components can simultaneously provide stronger constraint on the battery cell assembly, further balancing the upward expansion of multiple battery cells and improving the reliability of the battery device.

[0028] In some embodiments, there are multiple battery cell assemblies and multiple grooves. The multiple grooves are spaced apart along a second direction, and the multiple battery cell assemblies are arranged along the second direction. The second direction intersects with the first direction, and the plane containing the second direction and the first direction intersects with the height direction of the housing.

[0029] The multiple grooves can improve the strength of the first housing, making the battery device more resistant to collisions and impacts, and can limit the multiple battery cell components along the height of the housing to balance the expansion of the multiple battery cells.

[0030] In some embodiments, two adjacent battery cell assemblies are bonded together to a limiting member.

[0031] Therefore, on the one hand, the number of limiting components can be reduced, and on the other hand, multiple battery cell assemblies can be formed into a whole. When the expansion force of a single battery cell along the height direction of the casing is large, the expansion force can be dispersed to improve the constraint on the single battery cell.

[0032] In some embodiments, the projection of the reinforcing member onto the top wall body at least partially overlaps with the projection of the limiting member onto the top wall body.

[0033] During the expansion of a single battery cell, the limiting component experiences significant stress at the corresponding position on the top wall. By ensuring that the projection of the reinforcing component on the top wall at least partially overlaps with the projection of the limiting component on the top wall, the area on the top wall experiencing significant stress can be constrained, thereby reducing local deformation of the top wall caused by excessive stress and thus lowering the probability of damage to the first housing.

[0034] In some embodiments, the battery cell includes a housing, the side of the housing facing the first housing having electrode terminals and a pressure relief mechanism for venting internal gas from the battery cell. Along the height direction of the housing, the projection of the limiting member on the housing is located outside the projection of the electrode terminals on the housing, and the projection of the limiting member on the housing is located outside the projection of the pressure relief mechanism on the housing.

[0035] Therefore, the limiting component can be made to not obstruct the electrode terminals and the pressure relief mechanism, so that the electrode terminals and the pressure relief mechanism can work normally.

[0036] In some embodiments, the battery device further includes:

[0037] The locking attachment connects the first housing to the second housing, with the end of the locking attachment passing through the reinforcing member and the top wall.

[0038] The end of the locking accessory passes through the reinforcing member and the top wall, which can further enhance the constraint of the first housing on the limiting member, thereby improving the constraint on multiple battery cells, reducing the possibility of damage to electrical connection components due to excessive differences in the expansion of different battery cells, and improving the reliability of the battery device.

[0039] In some embodiments, the second housing includes a first structural beam and a second structural beam, which are spaced apart along a first direction. A battery cell assembly is located between the first and second structural beams, and a reinforcing member is connected to the first and second structural beams respectively via a locking attachment.

[0040] The reinforcing components are connected to the first and second structural beams respectively via locking accessories, which can strengthen the second box body and improve the overall strength and rigidity of the box body.

[0041] In some embodiments, the housing further includes a first seal surrounding the lock accessory, the lock accessory being sealed together by the first seal and a reinforcing member.

[0042] The first sealing element surrounds the lock accessory, effectively filling any tiny gaps that may exist between the lock accessory and the reinforcing element, preventing external dust, moisture, impurities, etc. from entering the cabinet and ensuring a relatively stable internal environment.

[0043] In some embodiments, the housing further includes a second seal, which is provided between the first housing and the second housing. The second seal surrounds the lock accessory, and the first housing is sealed to the second housing through the second seal.

[0044] The second sealing element surrounds the lock accessory, which can effectively fill any tiny gaps that may exist between the first and second boxes, preventing external dust, moisture, impurities, etc. from entering the box and ensuring a relatively stable internal environment.

[0045] 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.

[0046] Since the electrical 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.

[0047] 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

[0048] 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:

[0049] Figure 1 This is an isometric view of a battery device according to the first embodiment of this application;

[0050] Figure 2A for Figure 1 AA partial sectional view;

[0051] Figure 2B for Figure 2A A magnified view of a portion of point I;

[0052] Figure 3A This is an isometric view of a battery device according to a second embodiment of this application;

[0053] Figure 3B for Figure 3A A partial sectional view of BB;

[0054] Figure 3C for Figure 3B A magnified view of section II;

[0055] Figure 4A This is an isometric view of a battery device according to a third embodiment of this application;

[0056] Figure 4B for Figure 4A A partial sectional view of CC;

[0057] Figure 4C for Figure 4A A partial sectional view of DD;

[0058] Figure 4D for Figure 4B A magnified view of section III;

[0059] Figure 5A This is an isometric view of a first embodiment of the first housing in a battery device according to some embodiments of this application;

[0060] Figure 5B This is an isometric view of a second embodiment of the first housing in a battery device according to some embodiments of this application;

[0061] Figure 6 This is a structural diagram of a vehicle as an electrical device in some embodiments of this application.

[0062] The reference numerals in the detailed embodiments are as follows:

[0063] 1000, vehicle; 200, controller; 300, motor;

[0064] 100. Battery device;

[0065] 10. Battery cell assembly; 11. Battery cell; 111. Housing; 1111. Electrode terminals; 1112. Pressure relief mechanism;

[0066] 20. Box body; 21. First box body; 211. Top wall body; 212. Groove; 2121. Bottom wall body; 2122. Side wall body; 213. Protrusion; 214. Reinforcing member; 22. Second box body; 221. First structural beam; 222. Second structural beam; 23. First sealing element; 24. Second sealing element;

[0067] 30. Limiting components;

[0068] 40. Lock accessories;

[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 groups" refers to two or more including two groups, 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, 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] During use, the multiple battery cells inside the battery casing will expand, which can easily cause the battery cells to expand upwards. Different battery cells will expand upwards at different rates, and if the upward expansion forces of different battery cells differ too much, it can easily damage the electrical connection components inside the battery. For example, the busbar between two adjacent battery cells can easily be broken when the expansion force is large, resulting in low reliability of the battery operation.

[0079] In view of this, this application provides a battery device in which a reinforcing member is located on the outer surface of a first housing, and a top wall constrains multiple battery cells by a limiting member. This can reduce the difference in the expansion amount of multiple battery cells along the height direction of the housing, thereby reducing the possibility of damage to electrical connection components caused by excessive differences in the expansion amount of different battery cells, and improving the reliability of the battery device. At the same time, placing the reinforcing member on the outer surface of the first housing, compared with placing the reinforcing member between the battery cells and the first housing, can save internal space of the housing, allowing the battery cells to be made larger, thereby increasing the volumetric energy density of the battery device.

[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. A composite current collector may include a polymer material substrate and a metal layer. A composite current collector can be formed by forming metallic materials such as aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys on a polymer material substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene.

[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 include, but are not limited to, at least one of lithium iron phosphate such as LiFePO4 (also referred to as LFP), lithium iron phosphate and carbon composites, lithium manganese phosphate such as LiMnPO4, lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide such as LiCoO2, lithium nickel oxide such as LiNiO2, lithium manganese oxide such as LiMnO2, LiMn2O4, lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 can also be abbreviated as NCM 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 can also be abbreviated as NCM 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 can also be abbreviated as NCM 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 can also be abbreviated as NCM 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 can also be abbreviated as NCM 811 Lithium nickel cobalt aluminum oxides such as LiNi 0.8 Co 0.15 Al 0.05 At least one of O2 and its 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. A composite current collector may include a polymer material substrate and a metal layer. A composite current collector can be formed by forming metal materials such as copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys on a polymer material substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene.

[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 or / and 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 one or more of the following: oxide solid electrolytes, crystalline perovskite, sodium superconducting ion conductors, garnet, amorphous LiPON thin films, sulfide solid electrolytes, crystalline lithium superconducting ion conductors, lithium germanium phosphate sulfide, silver sulfide, amorphous sulfides, 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, etc.

[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 polypropylene, or a composite metal casing such as a copper-aluminum composite casing. In some embodiments, the casing may be a sealed structure or a non-sealed 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, such as 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 the 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 threshold design 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. Figures 1-5B 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 2A , Figure 2B and Figure 5A The battery device 100 includes a battery cell assembly 10, a limiting member 30, and a housing 20. The battery cell assembly 10 includes multiple 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 together define an accommodating space. The battery cell assembly 10 is located within this accommodating space. The first housing 21 includes a top wall 211 and a reinforcing member 214. The reinforcing member 214 is located on the side of the top wall 211 facing away from the second housing 22 and is connected to the top wall 211. The first direction X intersects with the height direction Z of the housing 20.

[0143] The height direction Z of the housing 20 refers to the direction in which the first housing 21 and the second housing 22 are interlocked. In actual use, the first housing 21 can be located above or below the second housing 22.

[0144] The connection between the reinforcing member 214 and the top wall 211 can be welding or riveting.

[0145] The reinforcing member 214 can be a strip structure.

[0146] The material of the reinforcing member 214 can be, but is not limited to, steel, titanium alloy, carbon fiber composite material, etc.

[0147] The top wall 211 constrains multiple battery cells 11 through the limiting member 30.

[0148] In this embodiment, "constraint" refers to restricting and fixing the battery cell 11 in spatial position.

[0149] The reinforcing member 214 is located on the outer surface of the first housing 21. The top wall 211 constrains multiple battery cells 11 through the limiting member, which can reduce the difference in the expansion amount of multiple battery cells 11 along the height direction Z of the housing 20. This reduces the possibility of damage to electrical connection components caused by excessive difference in the expansion amount of different battery cells 11, thereby improving the reliability of the battery device 100. At the same time, placing the reinforcing member 214 on the outer surface of the first housing 21 saves internal space of the housing 20 compared to placing the reinforcing member 214 between the battery cells 11 and the first housing 21, allowing the battery cells 11 to be made larger, thereby increasing the volumetric energy density of the battery device 100.

[0150] In some embodiments, the battery device 100 further includes a limiting member 30 located on the side of the battery cell assembly 10 facing the first housing 21, and the top wall 211 constrains a plurality of battery cells 11 by the limiting member 30.

[0151] The limiting member 30 can be a strip structure or a frame structure. For example, in the battery cell assembly 10, the limiting member 30 can be made into a frame structure, so that the two opposite edges of the frame structure constrain the rows of battery cells 11. Alternatively, a strip structure can be used to constrain the rows of battery cells 11.

[0152] In some embodiments, please refer to Figure 1 , Figure 2A and Figure 2B Multiple battery cells 11 are respectively bonded to the limiting member 30, and the limiting member 30 is connected to the top wall 211.

[0153] The connection between the limiting member 30 and the top wall 211 includes, but is not limited to, welding, screw or snap-fit ​​connection.

[0154] Therefore, the limiting member 30 can bond and fix multiple battery cells 11 of the battery cell assembly 10 to constrain the multiple battery cells 11 when they expand, thereby reducing the difference in the expansion amount of the multiple battery cells 11, so as to reduce the damage to the electrical connection components inside the battery device 100 and improve the reliability of the operation of the battery device 100.

[0155] In some embodiments, please refer to Figure 1 , Figure 2A and Figure 2BThe limiting member 30 is bonded to the top wall 211, and the bonding strength between the limiting member 30 and the top wall 211 is less than the bonding strength between the battery cell 11 and the limiting member 30.

[0156] Bond strength refers to the ability of two bonded objects to resist separation by external forces after being bonded together with adhesives such as glue.

[0157] When the expansion amount of an individual battery cell 11 along the height direction Z of the housing 20 is large, the limiting member 30, due to its adhesion to multiple battery cells 11, can exert a restraining force on the battery cell 11 with the large expansion amount.

[0158] The top wall 211 is bonded to the limiting member 30. During installation, the limiting member 30 can be bonded to a predetermined position on the top wall 211. Structural adhesive is applied to the top of the battery cell 11. After the first housing 21 and the second housing 22 are fastened together, the limiting member 30 is bonded to the battery cell 11 through the structural adhesive, so that the limiting member 30 can be bonded to the battery cell 11 in the predetermined position for easy installation. Since the bonding strength between the top wall 211 and the limiting member 30 is less than the bonding strength between the limiting member 30 and multiple battery cells 11, the limiting member 30 can provide better constraint for multiple battery cells 11. When disassembling the first housing 21, the limiting member 30 can be bonded to the battery cell 11 and separated from the first housing 21, so that the limiting member 30 maintains the constraint force on multiple battery cells 11 without having to re-bond the limiting member 30 to the battery cell 11, thus facilitating disassembly and assembly.

[0159] In some embodiments, please refer to Figure 1 , Figure 2A and Figure 2B Multiple battery cells 11 are respectively bonded to the limiting member 30, and the limiting member 30 abuts against the top wall 211.

[0160] During disassembly and assembly, compared with the method of bonding the limiting member 30 to the first housing 21, it is not necessary to overcome the adhesive force between the limiting member 30 and the first housing 21, so that the first housing 21 and the second housing 22 can be separated, which facilitates the disassembly of the first housing 21. At the same time, multiple battery cells 11 are bonded to the limiting member 30 respectively. During the process of the multiple battery cells 11 expanding along the height direction Z of the housing 20, the limiting member 30 can provide better constraint force for the multiple battery cells 11.

[0161] In some embodiments, please refer to Figures 3A-4D The surface of the top wall 211 facing the second housing 22 has a protrusion 213, which constrains multiple battery cells 11 by a limiting member 30.

[0162] There can be multiple protrusions 213, with one protrusion 213 corresponding to the top of each battery cell 11. The protrusion 213 can also be a long strip protrusion, and the length direction of the protrusion 213 is the same as the arrangement direction of the multiple battery cells 11.

[0163] The protrusion 213 can improve the strength and rigidity of the first housing 21. On the other hand, under the premise that the distance between the top wall 211 and the battery cell 11 remains unchanged, the size of the limiting member 30 along the height direction Z of the housing 20 can be reduced, so as to save the material usage of the limiting member 30.

[0164] In some embodiments, multiple battery cells 11 are respectively bonded to the limiting member 30, and the limiting member 30 is connected to the protrusion 213.

[0165] The connection between the limiting member 30 and the protrusion 213 includes, but is not limited to, screw connection, snap-fit ​​or adhesive connection.

[0166] Therefore, the limiting member 30 can bond and fix multiple battery cells 11 of the battery cell assembly 10 to constrain the multiple battery cells 11 when they expand, thereby reducing the difference in the expansion amount of the multiple battery cells 11, so as to reduce the damage to the electrical connection components inside the battery device 100 and improve the reliability of the operation of the battery device 100.

[0167] In some embodiments, multiple battery cells 11 are bonded to the limiting member 30, the limiting member 30 is bonded to the protrusion 213, and the bonding strength between the limiting member 30 and the protrusion 213 is less than the bonding strength between the battery cell 11 and the limiting member 30.

[0168] The protrusion 213 is bonded to the limiting member 30. During installation, the protrusion 213 serves a positioning function, facilitating the bonding of the limiting member 30 to the predetermined position on the first housing 21. After applying structural adhesive to the top of the battery cell 11, when the first housing 21 and the second housing 22 are fastened together, the limiting member 30 is bonded to the battery cell 11 through the structural adhesive, ensuring that the limiting member 30 is bonded to the battery cell 11 at the predetermined position for easy installation. When disassembling the first housing 21, the limiting member 30 can be bonded to the battery cell 11 and separated from the first housing 21, maintaining the constraint force of the limiting member 30 on the multiple battery cells 11 without needing to re-bond the limiting member 30 to the battery cell 11, thus facilitating disassembly and assembly.

[0169] In some embodiments, multiple battery cells 11 are respectively bonded to the limiting member 30, and the limiting member 30 abuts against the protrusion 213.

[0170] During disassembly and assembly, compared with the method of bonding the limiting member 30 to the first housing 21, it is not necessary to overcome the adhesive force between the limiting member 30 and the first housing 21, so that the first housing 21 and the second housing 22 can be separated, which facilitates the disassembly of the first housing 21. At the same time, multiple battery cells 11 are bonded to the limiting member 30 respectively. During the process of the multiple battery cells 11 expanding along the height direction Z of the housing 20, the limiting member 30 can provide better constraint force for the multiple battery cells 11.

[0171] In some embodiments, please refer to Figures 4A-4D , Figure 5B The top wall 211 has a groove 212 extending in the first direction X on the surface opposite to the second housing 22. The reinforcing member 214 is located in the groove 212. The groove 212 includes a bottom wall 2121 and a side wall 2122. On the surface of the top wall 211 facing the battery cell 11, the bottom wall 2121 and at least part of the side wall 2122 form a protrusion 213.

[0172] The cross-sectional shape of the groove 212 can be in various forms, such as rectangular, trapezoidal or semi-circular.

[0173] When the space in the height direction Z of the housing 20 is limited, the depth of the groove 212 can be designed to be greater than or equal to the dimension of the reinforcing member 214 along the height direction Z of the housing 20, so that the reinforcing member 214 does not protrude from the groove 212, thereby reducing the possibility of interference between the reinforcing member 214 and other components during installation. When the space in the height direction Z of the housing 20 is not limited, the depth of the groove 212 can be less than the dimension of the reinforcing member 214 along the height direction Z of the housing 20.

[0174] In one example, the reinforcement 214 can be welded to the sidewall of the groove 212. Specifically, intermittent spot welding can be used to reduce stress during the welding process, thereby reducing the deformation of the first housing 21.

[0175] The groove 212 allows the reinforcing member 214 to be placed on the outside of the housing 20 without changing the height of the housing 20. It can also provide a constraint force to the first housing 21 during the expansion of the battery cell 11 along the height direction Z of the housing 20, thereby improving the strength and rigidity of the first housing 21, reducing the deformation of the first housing 21, making the first housing 21 more resistant to impact and collision, and thus better protecting the battery cell assembly 10.

[0176] In some embodiments, please refer to Figure 4A and Figure 4BThe number of limiting members 30 is multiple, and the multiple limiting members 30 are spaced apart along the second direction Y. Each limiting member 30 corresponds to a groove 212. The bottom wall 2121 is bonded or abutted to the limiting member 30. 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 box 20.

[0177] Multiple limiting members 30 can simultaneously provide stronger constraint on the battery cell assembly 10 to further balance the upward expansion of multiple battery cells 11 and improve the reliability of the battery device 100.

[0178] In some embodiments, please refer to Figure 4A and Figure 4B The number of battery cell components 10 is multiple, the number of grooves 212 is multiple, the multiple grooves 212 are spaced apart along the second direction Y, the multiple battery cell components 10 are arranged along the second direction Y, the second direction Y intersects with the first direction X, and the plane containing the second direction Y and the first direction X intersects with the height direction Z of the housing 20.

[0179] The arrangement of multiple grooves 212 can improve the strength of the first housing 21, making the battery device 100 more resistant to collisions and impacts, and can limit the multiple battery cell assemblies 10 along the height direction Z of the housing 20 to balance the expansion of the multiple battery cells 11.

[0180] In some embodiments, please refer to Figure 4B Two adjacent battery cell modules 10 are bonded together to a limiting member 30.

[0181] Therefore, on the one hand, the number of limiting components 30 can be reduced, and on the other hand, multiple battery cell assemblies 10 can be formed into a whole. When the expansion force of a single battery cell 11 along the height direction Z of the housing 20 is large, the expansion force can be dispersed to improve the constraint on the single battery cell 11.

[0182] In some embodiments, please refer to Figure 2B , 3B And 4B, the projection of the reinforcing member 214 on the top wall 211 at least partially coincides with the projection of the limiting member 30 on the top wall 211.

[0183] During the expansion of the battery cell 11, the limiting member 30 is subjected to greater force at the position corresponding to the top wall 211. By at least partially coinciding the projection of the reinforcing member 214 on the top wall 211 with the projection of the limiting member 30 on the top wall 211, the position of the top wall 211 subjected to greater force can be constrained, thereby reducing the local deformation of the top wall 211 caused by excessive force, and thus reducing the probability of the first housing 21 being damaged.

[0184] In some embodiments, please refer to Figure 2A , 3B and Figure 4B The battery cell 11 includes a housing 111. The housing 111 has an electrode terminal 1111 and a pressure relief mechanism 1112 on the side facing the first housing 21. The pressure relief mechanism 1112 is used to discharge the internal gas of the battery cell 11. Along the height direction Z of the housing 20, the projection of the limiting member 30 on the housing 111 is located outside the projection of the electrode terminal 1111 on the housing 111, and the projection of the limiting member 30 on the housing 111 is located outside the projection of the pressure relief mechanism 1112 on the housing 111.

[0185] Therefore, the limiting member 30 can be made not to obstruct the electrode terminal 1111 and the pressure relief mechanism 1112, so that the electrode terminal 1111 and the pressure relief mechanism 1112 can work normally. In other embodiments, the electrode terminal 1111 and the pressure relief mechanism 1112 are provided on the side of the housing 111 facing the side wall of the box 20.

[0186] In some embodiments, please refer to Figure 4C The battery device 100 also includes a locking attachment 40, the first housing 21 is connected to the second housing 22 via the locking attachment 40, and the end of the locking attachment 40 passes through the reinforcing member 214 and the top wall 211.

[0187] The locking accessory 40 can be in the form of a bolt or a screw with a nut. Taking a bolt as an example, the bolt portion passes sequentially through the corresponding holes on the reinforcing member 214 and the top wall 211, and is then threadedly connected and fixed to the corresponding hole on the second housing 22. Alternatively, the screw can be connected to the second housing 22 by threaded connection or welding, with the end of the screw passing through the corresponding connecting holes on the top wall 211 and the reinforcing member 214, and a nut threadedly connected to the end of the screw. This application does not specifically limit this aspect.

[0188] The end of the locking attachment 40 passes through the reinforcing member 214 and the top wall 211, which can further enhance the constraint of the first housing 21 on the limiting member 30, thereby improving the constraint on multiple battery cells 11, reducing the possibility of damage to electrical connection components due to excessive differences in the expansion of different battery cells 11, and improving the reliability of the battery device 100.

[0189] In some embodiments, please refer to Figure 4C The second housing 22 includes a first structural beam 221 and a second structural beam 222. The first structural beam 221 and the second structural beam 222 are spaced apart along a first direction X. The battery cell assembly 10 is located between the first structural beam 221 and the second structural beam 222. The reinforcing member 214 is connected to the first structural beam 221 and the second structural beam 222 respectively through a locking attachment 40.

[0190] In one example, the second housing 22 also includes a third side beam and a fourth side beam, which are spaced apart along the second direction Y. The first structural beam 221 to the fourth side beam form a frame to protect the battery cell assembly 10.

[0191] As an example, the first structural beam 221 and the second structural beam 222 are respectively provided with threaded holes, and each threaded hole is threadedly connected to a locking accessory 40.

[0192] The reinforcing member 214 is connected to the first structural beam 221 and the second structural beam 222 respectively through the locking attachment 40, which can strengthen the second box 22 and improve the overall strength and rigidity of the box 20.

[0193] In some embodiments, please refer to Figure 4C The housing 20 also includes a first seal 23, which surrounds the lock accessory 40. The lock accessory 40 is sealed and engaged by the first seal 23 and the reinforcing member 214.

[0194] The first sealing element 23 can be a sealing ring or a sealant.

[0195] The first sealing element 23 surrounds the lock accessory 40 and can effectively fill any tiny gaps that may exist between the lock accessory 40 and the reinforcing element 214, preventing external dust, moisture, impurities, etc. from entering the interior of the box 20 and ensuring a relatively stable internal environment.

[0196] In some embodiments, please refer to Figure 6 The housing 20 also includes a second sealing element 24. The second sealing element 24 is provided between the first housing 21 and the second housing 22. The second sealing element 24 is arranged around the lock accessory 40. The first housing 21 is sealed to the second housing 22 through the second sealing element 24.

[0197] The second seal 24 can be a sealing ring or sealant.

[0198] The second sealing element 24 is arranged around the lock accessory 40, which can effectively fill the tiny gaps that may exist between the first box 21 and the second box 22, preventing external dust, moisture, impurities and other substances from entering the box 20 and ensuring that the internal environment of the box 20 is relatively stable.

[0199] For ease of explanation, the following embodiments use an electrical device from some embodiments of this application as an example.

[0200] The electrical device includes the battery device 100 of the above embodiments, which is used to provide electrical energy to the electrical device.

[0201] Electrical devices can include, but are not limited to, electric vehicles, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0202] Figure 6 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 may also include 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.

[0203] Since the power-consuming device 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.

[0204] In an alternative embodiment of the battery device 100, please refer to Figures 4A-4DThe battery device 100 includes a battery cell assembly 10, a housing 20, a limiting member 30, and a locking accessory 40. The battery cell assembly 10 includes multiple battery cells 11 arranged along a first direction X. The housing 20 includes a first housing 21, a second housing 22, a first sealing member 23, and a second sealing member 24. The first housing 21 and the second housing 22 are interlocked and together define an accommodating space. The battery cell assembly 10 is located within this accommodating space. The first housing 21 includes a top wall 211 and a reinforcing member 214. The reinforcing member 214 is located on the side of the top wall 211 facing away from the second housing 22 and is connected to the top wall 211. The first direction X intersects with the height direction Z of the housing 20. The limiting member 30 is located on the side of the battery cell assembly 10 facing the first housing 21. The top wall 211, through the limiting member 30, constrains the multiple battery cells 11 along the height direction Z of the housing 20. The first housing 21 is connected to the second housing 22 via a locking attachment 40, the end of which passes through the reinforcing member 214 and the top wall 211. The surface of the top wall 211 facing away from the second housing 22 has a groove 212 extending along a first direction X. The reinforcing member 214 is located within the groove 212. The groove 212 includes a bottom wall 2121 and a side wall 2122. On the surface of the top wall 211 facing the battery cell 11, the bottom wall 2121 and at least a portion of the side wall 2122 form a protrusion 213. Multiple battery cells 11 are respectively bonded to a limiting member 30. The limiting member 30 is bonded to the protrusion 213, and the bonding strength between the limiting member 30 and the protrusion 213 is less than the bonding strength between the battery cell 11 and the limiting member 30. There are multiple limiting members 30, which are spaced apart along the second direction Y. Each limiting member 30 corresponds to a groove 212. The bottom wall 2121 is bonded to or abuts against the limiting member 30. The second direction Y intersects the first direction X, and the plane containing the second direction Y and the first direction X intersects the height direction Z of the housing 20. There are multiple battery cell assemblies 10, which are arranged along the second direction Y, and two adjacent battery cell assemblies 10 are bonded to a limiting member 30. The battery cell 11 includes a housing 111. The top of the housing 111 has an electrode terminal 1111 and a pressure relief mechanism 1112. The pressure relief mechanism 1112 is used to discharge the internal gas of the battery cell 11. Along the height direction Z of the housing 20, the projection of the limiting member 30 on the housing 111 is outside the projection of the electrode terminal 1111 on the housing 111, and the projection of the limiting member 30 on the housing 111 is outside the projection of the pressure relief mechanism 1112 on the housing 111. The projection of the reinforcing member 214 onto the top wall 211 at least partially overlaps with the projection of the limiting member 30 onto the top wall 211.The second housing 22 includes a first structural beam 221 and a second structural beam 222, which are spaced apart along a first direction X. A battery cell assembly 10 is located between the first structural beam 221 and the second structural beam 222. A reinforcing member 214 is connected to both the first structural beam 221 and the second structural beam 222 via a locking attachment 40. A first sealing member 23 surrounds the locking attachment 40, and the locking attachment 40 is sealed in place by the first sealing member 23 and the reinforcing member 214. A second sealing member 24 is provided between the first housing 21 and the second housing 22, surrounding the locking attachment 40, and the first housing 21 is sealed in place with the second housing 22 via the second sealing member 24.

[0205] The first housing 21 is connected to the second housing 22 via a locking attachment 40. The end of the locking attachment 40 passes through the reinforcing member 214 and the top wall 211, so that the reinforcing member 214 constrains the top wall 211 along the height direction Z of the housing 20. The top wall 211 constrains multiple battery cells 11 through the limiting member 30. When the multiple battery cells 11 expand along the height direction Z of the housing 20, the first housing 21 can provide a constraining force to the multiple battery cells 11, so as to reduce the difference in the amount of expansion of the multiple battery cells 11 along the height direction Z of the housing 20, thereby reducing the possibility of damage to electrical connection components caused by excessive difference in the amount of expansion of different battery cells 11, and improving the reliability of the battery device 100. In addition, the locking attachment 40 can also improve the strength and rigidity of the housing 20, making the housing 20 more resistant to impact and collision. The first sealing member 23 and the second sealing member 24 can seal the mating surfaces of the locking attachment 40 and the reinforcing member 214 as well as the mating surfaces of the first housing 21 and the second housing 22, so as to play a role in waterproofing and dustproofing.

[0206] 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 device comprises: a battery cell assembly comprising a plurality of battery cells arranged along a first direction; a box comprising a first box and a second box, the first box and the second box being buckled to each other and jointly defining a containing space in which the battery cell assembly is located, the first box comprising a top wall body and a reinforcing member, the reinforcing member being located on a side of the top wall body away from the second box and connected with the top wall body, the first direction intersecting with a height direction of the box.

2. The battery device according to claim 1, characterized by The battery device further comprises a limiting member located on a side of the battery cell assembly facing the first box, and the top wall body is constrained by the limiting member with respect to the plurality of battery cells.

3. The battery device of claim 2, wherein, The plurality of battery cells are respectively bonded with the limiting member, and the limiting member is connected with the top wall body.

4. The battery device of claim 3, wherein The limiting member is bonded with the top wall body, and the bonding strength between the limiting member and the top wall body is less than the bonding strength between the battery cell and the limiting member.

5. The battery device of claim 2, wherein The plurality of battery cells are respectively bonded with the limiting member, and the limiting member is abutted with the top wall body.

6. The battery device of claim 2, wherein A surface of the top wall body facing the second box has a protrusion, and the plurality of battery cells are constrained by the limiting member with respect to the protrusion.

7. The battery device of claim 6, wherein, The plurality of battery cells are respectively bonded with the limiting member, and the limiting member is connected with the protrusion.

8. The battery device of claim 7, wherein, The limiting member is bonded with the protrusion, and the bonding strength between the limiting member and the protrusion is less than the bonding strength between the battery cell and the limiting member.

9. The battery device of claim 6, wherein, The plurality of battery cells are respectively bonded with the limiting member, and the limiting member is abutted with the protrusion.

10. The battery device according to any one of claims 6 to 9, wherein A surface of the top wall body away from the second box has a groove extending along the first direction, and the reinforcing member is located in the groove, the groove comprising a bottom wall body and a side wall body, and the bottom wall body and at least part of the side wall body constitute the protrusion on a surface of the top wall body facing the battery cell.

11. The battery device of claim 10, wherein, The number of the limiting members is plural, and the plurality of limiting members are arranged at intervals along a second direction, each of the limiting members corresponding to one of the grooves, the bottom wall body being bonded or abutted with the limiting member, the second direction intersecting with the first direction and a plane in which the first direction lies and intersecting with a height direction of the box.

12. The battery device of claim 10, wherein, The number of the battery cell assemblies is plural, and the number of the grooves is plural, the plurality of grooves being arranged at intervals along a second direction, and the plurality of battery cell assemblies being arranged along the second direction, the second direction intersecting with the first direction and a plane in which the first direction lies and intersecting with a height direction of the box.

13. The battery device of claim 12, wherein, The two adjacent battery cell assemblies are jointly bonded with one of the limiting members.

14. The battery device according to any one of claims 2 to 9, wherein The projection of the reinforcing member on the top wall body at least partially coincides with the projection of the limiting member on the top wall body.

15. The battery device according to any one of claims 2 to 9, wherein The battery cell includes a housing having an electrode terminal and a pressure relief mechanism for discharging internal gas of the battery cell toward one side of the first case, and the limiting member is located outside the projection of the electrode terminal on the projection of the housing and outside the projection of the pressure relief mechanism on the projection of the housing in the height direction of the case.

16. The battery device according to any one of claims 1 to 9, wherein The battery device further includes: A lock member by which the first case is connected to the second case, and an end portion of the lock member penetrates through the reinforcing member and the top wall body.

17. The battery device of claim 16, wherein, The second case includes first and second structural beams spaced apart in the first direction, and the battery cell assembly is located between the first and second structural beams, and the reinforcing member is connected to the first and second structural beams by the lock member.

18. The battery device of claim 16, wherein, The case further includes a first seal member disposed around the lock member, and the lock member is sealingly engaged with the reinforcing member by the first seal member.

19. The battery device of claim 16, wherein, The case further includes a second seal member provided between the first and second cases, and the second seal member is disposed around the lock member, and the first case is sealingly engaged with the second case by the second seal member.

20. An electrical device, comprising: A battery device as claimed in any one of claims 1 to 19 is used to provide electrical energy to the electrical device.

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