Battery device, power utilization device and energy storage device

Abstract

The utility model discloses a battery device, a power utilization device and an energy storage device. The battery device comprises a battery cell assembly and a box body. The battery monomer assembly comprises a plurality of battery monomers arranged along 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 jointly define a containing space, the first box body and the second box body are connected, the battery monomer assembly is located in the containing space, the first box body comprises a first cover body and a confluence piece, and the confluence piece is in insulation connection with the first cover body; one side, facing the first box body, of each battery monomer is provided with an electrode terminal, and the electrode terminals of two adjacent battery monomers are electrically connected through a bus piece. The confluence piece is integrated in the first box body, so that the space between the traditional first box body and the battery monomers can be reduced, and the volume energy density of the battery device is improved; and meanwhile, the trouble of manually placing or positioning the confluence pieces one by one can be reduced, the operation process is simplified, and the production efficiency can be improved.

Description

Technical Field

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

[0002] The battery contains multiple individual cells, which are electrically connected to adjacent cells via a busbar to output a large current and voltage. Currently, a large space needs to be reserved between the battery cover and the individual cells for welding the busbar, resulting in low space utilization within the battery, affecting the battery's volumetric energy density, and causing low assembly efficiency. Utility Model Content

[0003] In view of the above problems, this application provides a battery device, a power consumption device and an energy storage device, which integrates the busbars on the housing, thereby reducing the space occupied by the busbars inside the housing, and allowing multiple busbars to be welded simultaneously during welding, thereby improving installation efficiency.

[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 jointly define an accommodating space. A battery cell assembly is located within the accommodating space. The first housing includes a first cover and a busbar, which is insulated from the first cover. Each battery cell has an electrode terminal on the side facing the first housing. The busbar is electrically connected to the electrode terminals of two different battery cells. The first direction intersects the height direction of the housing.

[0007] Integrating the busbar into the first housing reduces the space between the traditional first housing and the battery cells, making the overall structure more compact and effectively improving the space utilization within the housing, thereby increasing the volumetric energy density of the battery device. At the same time, by closing the first housing with the second housing during welding, the busbar can be welded to the electrode terminals without the need for manual placement or positioning of the busbars one by one, simplifying the operation process and helping to improve production efficiency.

[0008] In some embodiments, the first cover is provided with a mounting through hole. Along the height direction of the housing, in two adjacent electrode terminals of two adjacent battery cells, at least a portion of the electrode terminal is projected onto the first cover within the range of the mounting through hole, and at least a portion of the busbar is projected onto the first cover within the range of the mounting through hole.

[0009] During the welding process, the first cover and the second housing can be closed, and the welding equipment welds the busbar to the electrode terminals through the mounting through-hole. Therefore, the mounting through-hole facilitates the welding operation of integrating the busbar into the first cover, and the mounting through-hole also has a positioning function for the busbar, reducing the offset of the busbar when manufacturing the first housing, thereby improving the welding quality.

[0010] In some embodiments, the mounting through hole includes a first through hole and a second through hole, which are spaced apart along a first direction. The busbar includes a first part and a second part electrically connected to the first part. Along the height direction of the housing, at least a portion of the first part is projected onto the first cover within the projection range of the first through hole on the first cover, and at least a portion of the second part is projected onto the first cover within the projection range of the second through hole on the first cover. In two adjacent battery cells, the first part is electrically connected to the electrode terminal of one battery cell, and the second part is electrically connected to the electrode terminal of the other battery cell.

[0011] The first through hole and the second through hole are spaced apart along the first direction, so that a connecting rib is formed between the first through hole and the second through hole, which helps to improve the strength of the first cover. At the same time, the first through hole and the second through hole can correspond to the first part and the second part of the busbar, and play a positioning role during the welding process, which facilitates the welding of the busbar to the electrode terminals of two adjacent battery cells.

[0012] In some embodiments, a first portion protrudes from the first cover along the direction from the first cover to the battery cell, and / or a second portion protrudes from the first cover.

[0013] This allows for more complete electrical contact between the busbar and the electrode terminals during assembly, facilitating soldering.

[0014] In some embodiments, the manifold is integrally formed with the first cover.

[0015] The integral molding of the busbar and the first cover reduces the potential loosening problem that may occur when using other connection methods between the busbar and the first cover, making the connection between the busbar and the first cover more secure and reducing the risk of electrical connection failure due to structural loosening.

[0016] In some embodiments, along the height direction of the housing, the first cover includes a fiber layer and a polymer layer, the fiber layer is provided on at least one side of the manifold, and the polymer layer is provided on the side of the fiber layer facing away from the manifold.

[0017] The first cover is composed of a fiber layer and a polymer layer, which can enhance the structural strength of the first cover and make it less prone to deformation or cracking when faced with external impact or pressure, thereby effectively protecting the battery cell components inside the box.

[0018] In some embodiments, the fiber layer has pores, and a portion of the polymer layer fills the pores of the fiber layer.

[0019] This can further improve the strength of the first cover and reduce the likelihood of deformation and breakage.

[0020] In some embodiments, the polymer layer includes either a thermosetting material layer or a thermoplastic material layer.

[0021] Compared with the injection-molded material used for the first cover, the tensile strength and flexural modulus of the first cover can be improved, thereby increasing the constraint of the first cover on multiple battery cells and increasing the main frequency (natural frequency) of the battery device. In the case of vibration, it can reduce the failure of electrical connections of internal components of the battery device caused by vibration, so that the battery device can work more stably.

[0022] In some embodiments, the manifold is bonded to the first cover.

[0023] The adhesive bonding method is simple to operate and can reduce the manufacturing difficulty of the first box to a certain extent. When making the first box by injection molding or compression molding, it can simplify the complexity of the mold and facilitate manufacturing.

[0024] In some embodiments, the battery cell includes a housing, with electrode terminals provided on the side of the housing facing the first housing, and a first cover is bonded to the housing.

[0025] By bonding the first cover to the outer shell of the battery cell, the constraint of the first cover on the battery cell is improved, which helps to increase the main frequency of the battery device, reduce the failure of electrical connections of internal components of the battery device caused by vibration or expansion of the battery cell, and improve the reliability of the battery device.

[0026] In some embodiments, the battery cell assembly further includes an insulating sheet located between the battery cell and the first cover. The battery cell includes a housing, and the housings of different battery cells are respectively connected to the insulating sheet. The insulating sheet is bonded to the first cover.

[0027] The insulating sheet reduces the risk of short circuits caused by metal fragments falling onto the battery cell casing during the busbar welding process, thus improving the safety of the battery device. Simultaneously, by bonding the insulating sheet to both the battery cell casing and the first cover, the first cover further strengthens the constraint of the battery cell assembly, making the relative positions of the components more stable when subjected to external impacts or vibrations. This helps maintain the stability and reliability of the internal electrical connections of the battery device.

[0028] In some embodiments, the first housing further includes a second cover, which is located on the side of the first cover away from the battery cell and is connected to the first cover.

[0029] The second cover enhances the overall structural strength of the first housing, providing support and protection. This helps the first housing better withstand external pressure, protects the internal battery cells and busbars, and improves the overall mechanical and protective performance of the battery device.

[0030] In some embodiments, the first cover has a groove on the side opposite to the battery cell, the groove including a bottom wall body, the bottom wall body forming a protrusion on the side of the first cover facing the battery cell, and the second cover body is located within the groove.

[0031] This improves the strength of the first cover, reducing deformation when subjected to collisions or impacts, thus providing better protection for the internal components of the battery device. At the same time, it reduces the space between the bottom wall and the battery cells, facilitating the electrical connection between the busbar and the battery cells.

[0032] In some embodiments, the second cover is an insulating element.

[0033] The second cover acts as an insulator, effectively preventing conductive substances or dust that may exist outside the first housing from coming into contact with the internal battery cells and busbars, thus improving the safety and protection performance of the battery device.

[0034] In some embodiments, there are multiple battery cell assemblies arranged along a second direction. The first housing also includes a reinforcing member extending along a first direction. The reinforcing member is located between a first cover and a second cover and is connected to the first cover. There is one reinforcing member for every two adjacent battery cell assemblies. The two adjacent battery cell assemblies corresponding to the reinforcing member are the first battery cell assembly and the second battery cell assembly, respectively. Along the height direction of the housing, the projections of the first battery cell assembly and the second battery cell assembly onto the first cover intersect with the projections of the reinforcing member onto the first cover, respectively. 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 housing.

[0035] The reinforcement can increase the strength of the first cover, thereby enhancing the constraint on the battery cell assembly, reducing the risk of internal electrical connection failure due to vibration or battery cell expansion, and improving the reliability of the battery device.

[0036] In some embodiments, the battery device further includes a first locking attachment, the first cover being connected to the second housing via the first locking attachment, and the end of the first locking attachment passing through the reinforcement and the first cover in sequence.

[0037] This improves the connection strength between the first and second housings, while also enhancing the constraint of the first housing on the battery cell assembly. This reduces the risk of electrical connection failures or loosening of some components of the battery device due to vibration or expansion, thus helping to improve the stability of the battery device's operation.

[0038] In some embodiments, there are multiple battery cell assemblies arranged along a second direction. The first housing also includes a reinforcing member extending along a first direction. The reinforcing member is located on the side of the busbar opposite to the first cover and is connected to the first cover. There is one reinforcing member for every two adjacent battery cell assemblies. The two adjacent battery cell assemblies corresponding to the reinforcing member are the first battery cell assembly and the second battery cell assembly, respectively. Along the height direction of the housing, the projections of the first battery cell assembly and the second battery cell assembly on the first cover intersect with the projections of the reinforcing member on the first cover, respectively. 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 housing.

[0039] The reinforcement can increase the strength of the first cover, thereby enhancing the constraint on the battery cell assembly, reducing the risk of internal electrical connection failure due to vibration or battery cell expansion, and improving the reliability of the battery device.

[0040] In some embodiments, the battery device further includes a first locking attachment, the first cover being connected to the second housing via the first locking attachment, and the end of the first locking attachment passing through the first cover and the reinforcing member in sequence.

[0041] This improves the connection strength between the first and second housings, while also enhancing the constraint of the first housing on the battery cell assembly. This reduces the risk of electrical connection failures or loosening of some components of the battery device due to vibration or expansion, thus helping to improve the stability of the battery device's operation.

[0042] In some embodiments, the reinforcement is integrally formed with the first cover.

[0043] The reinforcement is integrally formed with the first cover, which helps to improve the strength and rigidity of the first box and reduces the possibility of strength reduction due to structural connection problems. At the same time, the integral forming can simplify the assembly process and facilitate operation.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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

[0049] 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:

[0050] Figure 1 This is an isometric view of a battery device according to an embodiment of this application;

[0051] Figure 2 This is an exploded view showing the positional relationship between the first housing and the first lock accessory according to the first embodiment of this application;

[0052] Figure 3 This is an exploded view showing the positional relationship between the first housing and the first lock accessory in the second embodiment of this application;

[0053] Figure 4 This is an isometric view of a busbar in the first housing according to an embodiment of this application;

[0054] Figure 5 This is an isometric view of a single battery cell in a battery device according to an embodiment of this application;

[0055] Figure 6 This is a top view of a battery device according to the first embodiment of this application;

[0056] Figure 7 for Figure 6 AA section view;

[0057] Figure 8 for Figure 7 A magnified view of a portion of point I;

[0058] Figure 9 This is a top view of a battery device according to the first embodiment of this application;

[0059] Figure 10for Figure 9 BB section view;

[0060] Figure 11 for Figure 10 A magnified view of section II;

[0061] Figure 12 This is a partial cross-sectional view of the first cover body of an embodiment of this application, perpendicular to the first direction (the second cover body is omitted in the figure).

[0062] Figure 13 This is a structural diagram of an electrical device for a vehicle according to an embodiment of this application;

[0063] Figure 14 This is an isometric view of an energy storage device according to an embodiment of this application.

[0064] The reference numerals in the detailed embodiments are as follows:

[0065] 1000, vehicles;

[0066] 100. Battery assembly; 200. Controller; 300. Motor;

[0067] 10. Battery cell assembly; 11. Battery cell; 111. Housing; 1111. Electrode terminal; 102. Insulating sheet; 103. First battery cell assembly; 104. Second battery cell assembly;

[0068] 20. Box body; 21. First box body; 211. First cover body; 2111. Fiber layer; 2112. Polymer layer;

[0069] 2113. Mounting through hole; 21131. First through hole; 21132. Second through hole; 2114. Groove; 2116. First locking hole; 212. Second cover; 213. Busbar; 2131. First part; 2132. Second part; 214. Reinforcing member; 215. First locking accessory; 22. Second housing;

[0070] 2000, Energy storage device; 2100, Cabinet; 2200, Battery cluster;

[0071] X, first direction; Y, second direction; Z, altitude direction. Detailed Implementation

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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).

[0078] 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.

[0079] 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.

[0080] During battery assembly, individual battery cells are first installed into the lower casing. Then, adjacent battery cells are electrically connected via busbars to enable the battery to output higher voltage and current. Finally, the casing is sealed with a top cover. A problem with this method is that a large space needs to be left between the top cover and the busbars to facilitate the welding of adjacent battery cells. Welding the busbars to the battery cells requires placing multiple busbars in predetermined positions and welding them one by one, which is time-consuming and labor-intensive.

[0081] In view of this, this application provides a battery device that integrates the busbar into the first housing, which can reduce the space between the traditional first housing and the battery cells, making the overall structure more compact and effectively improving the space utilization within the housing, thereby increasing the volumetric energy density of the battery device. At the same time, by closing the first housing and the second housing during welding, the busbar can be welded to the electrode terminals, eliminating the need for manual placement or positioning of the busbars one by one, simplifying the operation process and helping to improve production efficiency.

[0082] 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.

[0083] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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 0.05At 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.

[0099] 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.

[0100] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0101] 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 metal materials such as copper, copper 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] As an example, negative electrode active materials can be filled and / or deposited within the negative electrode current collector.

[0107] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0108] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0109] 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.

[0110] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramics. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a 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.

[0111] 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.

[0112] 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.

[0113] Liquid electrolytes include electrolyte salts and solvents.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0118] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0119] 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.

[0120] 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.

[0121] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0122] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0123] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0124] In some embodiments, the electrode assembly has a stacked structure.

[0125] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0126] 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.

[0127] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0128] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0129] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0130] In some embodiments, the electrode assembly may be cylindrical, flat, or polygonal in shape.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] 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 one or more.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0139] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] For ease of explanation, please refer to the following examples. Figures 1-9 The following description will be based on a battery device 100 according to some embodiments of this application.

[0144] Please see Figures 1-8The battery device 100 includes a battery cell assembly 10 and a housing 20. 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 the accommodating space. The first housing 21 includes a first cover 211 and a busbar 213, which is insulated from the first cover 211. Each battery cell 11 has an electrode terminal 1111 on the side facing the first housing 21. The busbar 213 is electrically connected to the electrode terminals 1111 of two different battery cells 11. The first direction X intersects the height direction Z of the housing 20.

[0145] The connection methods of the first housing 21 and the second housing 22 include, but are not limited to, one or more combinations of connection methods such as bolt connection, adhesive connection or snap-fit ​​connection.

[0146] The busbar 213 can be electrically connected to the electrode terminals 1111 of two adjacent battery cells 11, or it can be electrically connected to the electrode terminals 1111 of two non-adjacent battery cells 11.

[0147] The connection between the manifold 213 and the first cover 211 includes bonding, integral molding, or screw connection.

[0148] The electrode terminals 1111 of two adjacent battery cells 11 can be connected in series or in parallel via the busbar 213.

[0149] Integrating the busbar 213 into the first housing 21 reduces the space between the traditional first housing 21 and the battery cell 11, making the overall structure more compact and effectively improving the space utilization within the housing, thereby increasing the volumetric energy density of the battery device 100. At the same time, by covering the first housing 21 with the second housing 22 during welding, the busbar 213 can be welded to the electrode terminal 1111 without the need for manual placement or positioning of the busbar 213, simplifying the operation process and helping to improve production efficiency.

[0150] In some embodiments, please refer to Figures 6-8 The first cover 211 is provided with a mounting through hole 2113. Along the height direction Z of the housing 20, in the two adjacent electrode terminals 1111 of two adjacent battery cells 11, at least a portion of the projection of the electrode terminal 1111 is located within the range of the mounting through hole 2113. The busbar 213 is located within the range of the mounting through hole 2113.

[0151] For the same busbar 213, there can be one or more mounting through holes 2113. The shape of the mounting through holes 2113 is not specifically limited; for example, they can be circular or square. For instance, if there is only one mounting through hole 2113, the busbar 213 is embedded in the side wall of the mounting through hole 2113. During welding, the welding head can abut against the busbar 213 through the mounting through hole 2113 to achieve welding between the busbar 213 and the electrode terminal 1111. The purpose of providing the mounting through holes 2113 is to facilitate the contact between the welding head and the busbar 213 during welding, and to allow the welding position to be determined through the mounting through holes 2113 during the welding process.

[0152] The number and arrangement of mounting holes 2113 can be determined based on the number of busbars 213 or the number and arrangement of battery cells 11. For example, there may be multiple battery cell assemblies 10, i.e., the battery cells 11 may be arranged in multiple rows and columns, and the electrode terminals 1111 of the battery cells 11 in the same battery cell assembly 10 may be electrically connected in series through busbars 213.

[0153] During the welding process, the first cover 211 and the second housing 22 can be closed together, and the welding equipment welds the busbar 213 to the electrode terminal 1111 through the mounting through hole 2113. Therefore, the mounting through hole 2113 facilitates the welding operation of integrating the busbar 213 into the first cover 211, and the mounting through hole 2113 has a positioning function for the busbar 213, which reduces the offset of the busbar 213 when manufacturing the first housing 21, thereby improving the welding quality.

[0154] In some embodiments, please refer to Figures 6-8 The mounting through hole 2113 includes a first through hole 21131 and a second through hole 21132. The first through hole 21131 and the second through hole 21132 are spaced apart along a first direction X. The busbar 213 includes a first part 2131 and a second part 2132 electrically connected to the first part 2131. Along the height direction Z of the housing 20, at least a portion of the projection of the first part 2131 onto the first cover 211 is within the range of the first through hole 21131, and at least a portion of the projection of the second part 2132 onto the first cover 211 is within the range of the second through hole 21132. In two adjacent battery cells 11, the first part 2131 is electrically connected to the electrode terminal 1111 of one battery cell 11, and the second part 2132 is electrically connected to the electrode terminal 1111 of the other battery cell 11.

[0155] In this embodiment, the first through hole 21131 and the second through hole 21132 are spaced apart along the first direction X, so that a connecting rib is formed between the first through hole 21131 and the second through hole 21132, which is beneficial to improve the strength of the first cover 211. At the same time, at least part of the projection of the first part 2131 on the first cover 211 is located within the range of the first through hole 21131, and at least part of the projection of the second part 2132 on the first cover 211 is located within the range of the second through hole 21132, so that the first through hole 21131 and the second through hole 21132 can correspond to the first part 2131 and the second part 2132 of the busbar 213. During the welding process, the welding head can abut against different positions of the busbar 213 through the first through hole 21131 and the second through hole 21132 respectively, so as to complete the welding operation of the busbar 213 and the electrode terminals 1111 of the two adjacent battery cells 11. Therefore, the first through hole 21131 and the second through hole 21132 can better determine the welding position during welding operations, thereby improving the overall installation efficiency.

[0156] In some embodiments, along the direction from the first cover 211 to the battery cell 11, a first portion 2131 protrudes from the first cover 211 and a second portion 2132 protrudes from the first cover 211.

[0157] Therefore, during assembly, the busbar 213 can make more full electrical contact with the electrode terminal 1111 to facilitate welding; at the same time, the position of the first cover 211 relative to the battery cell 11 can be adjusted in real time as needed to adjust the welding position of the busbar 213, making the welding position more accurate and improving the flexibility of operation.

[0158] In some embodiments, the manifold 213 is integrally formed with the first cover 211.

[0159] The term "integrated molding of the busbar 213 and the first cover 211" means that the two are a single structure and cannot be disassembled.

[0160] The busbar 213 and the first cover 211 can be integrally formed by injection molding or compression molding.

[0161] The integral molding of the busbar 213 and the first cover 211 reduces the potential loosening problem that may exist when other connection methods are used between the busbar 213 and the first cover 211, making the connection between the busbar 213 and the first cover 211 more secure and reducing the risk of electrical connection failure due to structural loosening.

[0162] In some embodiments, please refer to Figure 12The first cover 211 includes a fiber layer 2111 and a polymer layer 2112. Along the height direction Z of the box 20, at least one side of the manifold 213 is provided with a fiber layer 2111, and the side of the fiber layer 2111 facing away from the manifold 213 is provided with a polymer layer 2112.

[0163] When the busbar 213 has a fiber layer 2111 on only one side, the side of the busbar 213 away from the fiber layer 2111 may have a polymer layer 2112 or may not have a polymer layer 2112.

[0164] The material of the fiber layer 2111 includes, but is not limited to, any one of glass fiber, carbon fiber or natural fiber.

[0165] The polymer layer 2112 can be any of the following: a thermosetting material layer, a thermoplastic material layer, or a plastic layer.

[0166] The plastic layer can be made of insulating materials such as polyimide.

[0167] The first cover 211 is composed of a fiber layer 2111 and a polymer layer 2112, which can enhance the structural strength of the first cover 211, making it less prone to deformation or cracking when facing external impact or bearing certain pressure, thereby effectively protecting the battery cell assembly 10 inside the box 20.

[0168] In some embodiments, the fiber layer 2111 has pores, and a portion of the polymer layer 2112 fills the pores of the fiber layer 2111.

[0169] This can further improve the strength of the first cover 211 and reduce the possibility of deformation and breakage of the first cover 211.

[0170] In some embodiments, the polymer layer 2112 includes either a thermosetting material layer or a thermoplastic material layer.

[0171] The thermosetting material layer can be made of any of the following materials, including but not limited to epoxy resin, unsaturated polyester resin, or phenolic resin.

[0172] The thermoplastic material layer can be made of any material, including but not limited to polypropylene, polyamide, or polycarbonate.

[0173] Compared with the injection-molded material used for the first cover 211, the tensile strength and flexural modulus of the first cover 211 can be improved, thereby increasing the constraint of the first cover 211 on the multiple battery cells 11, thereby increasing the main frequency (natural frequency) of the battery device 100. In the case of vibration, it can reduce the failure of electrical connections of internal components of the battery device 100 caused by vibration, so that the battery device 100 can work more stably.

[0174] In some embodiments, the manifold 213 is bonded to the first cover 211.

[0175] The adhesive bonding method is simple to operate and can reduce the manufacturing difficulty of the first box 21 to a certain extent. When the first box 21 is made by injection molding or compression molding, the complexity of the mold can be simplified and manufacturing can be facilitated.

[0176] In some embodiments, please refer to Figures 5-8 The battery cell 11 includes a housing 111, and the housing 111 has an electrode terminal 1111 on the side facing the first housing 21. The first cover 211 is bonded to the housing 111.

[0177] By bonding the first cover 211 to the outer shell 111 of the battery cell 11, the constraint of the first cover 211 on the battery cell 11 is improved, which is conducive to increasing the main frequency of the battery device 100, reducing the failure of electrical connection of internal components of the battery device 100 caused by vibration or expansion of the battery cell 11, and improving the reliability of the operation of the battery device 100.

[0178] In some embodiments, please refer to Figures 9-11 The battery cell assembly 10 also includes an insulating sheet 102, which is located between the battery cell 11 and the first cover 211. The battery cell 11 includes a housing 111, and the housings 111 of different battery cells 11 are respectively connected to the insulating sheet 102. The insulating sheet 102 is bonded to the first cover 211.

[0179] The outer casing 111 of the battery cell 11 can be fixed to the insulating sheet 102 by means of bonding or welding.

[0180] The insulating sheet 102 reduces the risk of short circuits caused by metal debris falling onto the casing 111 of the battery cell 11 during the welding process of the busbar 213, thus improving the safety of the battery device 100. Simultaneously, by bonding the insulating sheet 102 to both the casing 111 of the battery cell 11 and the first cover 211, the first cover 211 further strengthens the constraint of the battery cell assembly 10 on the battery cell assembly. This makes the relative positions of the components more stable when the battery device 100 is subjected to external impacts or vibrations, helping to maintain the stability and reliability of the internal electrical connections of the battery device 100.

[0181] In some embodiments, please refer to Figure 2 and Figure 3 The first housing 21 also includes a second cover 212, which is located on the side of the first cover 211 away from the battery cell 11 and is connected to the first cover 211.

[0182] The second cover 212 and the first cover 211 can be connected and fixed by means of adhesive, screw connection or welding.

[0183] The second cover 212 enhances the overall structural strength of the first housing 21, providing support and protection for the first cover 211. This helps the first housing 21 better withstand external pressure, protect the internal battery cell assembly 10 and busbar 213, and improve the overall mechanical and protective performance of the battery device 100.

[0184] In some embodiments, please refer to Figure 2 and Figure 3 The first cover 211 has a groove 2114 on the side opposite to the battery cell 11. The groove 2114 includes a bottom wall body. The bottom wall body forms a protrusion on the side of the first cover 211 facing the battery cell 11. The second cover 212 is located in the groove 2114.

[0185] As an example, the first cover 211 includes a frame that is connected to the side wall of the groove 2114. The frame is provided with locking holes around its perimeter, and the locking holes of the frame are connected to the second housing 22 by locking components such as bolts.

[0186] This improves the strength of the first cover 211, reducing deformation when subjected to collisions or impacts, thus providing better protection for the internal components of the battery device 100. At the same time, it reduces the space between the bottom wall and the battery cell 11, facilitating the electrical connection between the busbar 213 and the battery cell 11.

[0187] In some embodiments, the second cover 212 is an insulating element.

[0188] The second cover 212 acts as an insulating component, effectively preventing conductive substances or dust that may exist outside the first housing 21 from coming into contact with the internal battery cell assembly 10 and busbar 213, thereby improving the safety and protection performance of the battery device 100.

[0189] In some embodiments, there are multiple battery cell assemblies 10, which are arranged along the second direction Y. The first housing 21 also includes a reinforcing member 214 extending along the first direction X. The reinforcing member 214 is located between the first cover 211 and the second cover 212 and is connected to the first cover 211. There is one reinforcing member 214 for every two adjacent battery cell assemblies 10. The two adjacent battery cell assemblies 10 corresponding to the reinforcing member 214 are the first battery cell assembly 103 and the second battery cell assembly 104, respectively. Along the height direction Z of the housing 20, the projections of the first battery cell assembly 103 and the second battery cell assembly 104 on the first cover 211 intersect with the projections of the reinforcing member 214 on the first cover 211. The second direction Y intersects with the first direction X, and the plane where the second direction Y and the first direction X are located intersects with the height direction Z of the housing 20.

[0190] The reinforcing member 214 can be connected to the first cover 211 by means of integral molding, bonding or welding.

[0191] The reinforcing member 214 can be a metal part or a non-metal part.

[0192] The reinforcement 214 can increase the strength of the first cover 211, thereby enhancing the constraint on the battery cell assembly 10, reducing the possibility of internal electrical connection failure due to vibration or expansion of the battery cell 11, and improving the reliability of the battery device 100.

[0193] In some embodiments, please refer to Figure 2 The battery device 100 also includes a first locking attachment 215, a first cover 211 is connected to a second housing 22 via the first locking attachment 215, and the end of the first locking attachment 215 passes through the reinforcing member 214 and the first cover 211 in sequence.

[0194] The first lock accessory 215 can be a bolt and nut assembly, a rivet, a screw and nut assembly, or a screw, etc.

[0195] Taking the first locking accessory 215 as a screw as an example, the first cover 211 is provided with a first locking hole 2116. Multiple first locking holes 2116 can be provided. The end of the screw passes through the first locking hole 2116 and is threadedly connected to the second housing 22. The screw can be replaced with a screw rod, which can be connected to the second housing 22 by screw or welding. The end of the screw rod is threaded with a nut.

[0196] Therefore, on the one hand, the connection strength between the first housing 21 and the second housing 22 is improved, and on the other hand, the constraint of the first housing 21 on the battery cell assembly 10 is also improved, reducing the possibility of electrical connection failure or loosening of some components of the battery device 100 due to vibration or expansion, which helps to improve the stability of the operation of the battery device 100.

[0197] In some embodiments, there are multiple battery cell assemblies 10, which are arranged along the second direction Y. The first housing 21 also includes a reinforcing member 214 extending along the first direction X. The reinforcing member 214 is located on the side of the busbar 213 away from the first cover 211 and is connected to the first cover 211. There is one reinforcing member 214 for every two adjacent battery cell assemblies 10. The two adjacent battery cell assemblies 10 corresponding to the reinforcing member 214 are the first battery cell assembly 103 and the second battery cell assembly 104, respectively. Along the height direction Z of the housing 20, the projections of the first battery cell assembly 103 and the second battery cell assembly 104 on the first cover 211 intersect with the projection of the reinforcing member 214 on the first cover 211. 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.

[0198] The reinforcing member 214 can be a pressure strip, which is set between two adjacent battery cell groups to constrain the battery cell 11 within the housing 20.

[0199] The reinforcement 214 can increase the strength of the first cover 211, thereby enhancing the constraint on the battery cell assembly 10, reducing the possibility of internal electrical connection failure due to vibration or expansion of the battery cell 11, and improving the reliability of the battery device 100.

[0200] In some embodiments, please refer to Figure 3 The battery device 100 also includes a first locking attachment 215. The first cover 211 is connected to the second housing 22 through the first locking attachment 215, and the end of the first locking attachment 215 passes through the first cover 211 and the reinforcing member 214 in sequence.

[0201] The first lock attachment 215 can be, but is not limited to, the structures listed above.

[0202] Therefore, on the one hand, the connection strength between the first housing 21 and the second housing 22 is improved, and on the other hand, the constraint of the first housing 21 on the battery cell assembly 10 is also improved, reducing the possibility of electrical connection failure or loosening of some components of the battery device 100 due to vibration or expansion, which helps to improve the stability of the operation of the battery device 100.

[0203] In some embodiments, the reinforcing member 214 is integrally formed with the first cover 211.

[0204] The reinforcement 214 and the first cover 211 are integrally formed, meaning that the two are not detachable.

[0205] The reinforcing member 214 and the first cover 211 can be integrally formed by molding or injection molding.

[0206] The reinforcing member 214 is integrally formed with the first cover 211, which helps to improve the strength and rigidity of the first box 21 and reduces the reduction in strength caused by structural connection problems. At the same time, the integral forming can simplify the assembly process and facilitate operation.

[0207] For ease of explanation, the following embodiments use an electrical device from some embodiments of this application as an example.

[0208] The electrical device includes the battery device 100 of the above embodiments, which is used to provide electrical energy to the electrical device.

[0209] 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.

[0210] Figure 13This 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.

[0211] 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.

[0212] For ease of explanation, please refer to the following examples. Figure 14 The following description will be based on an energy storage device 2000 according to some embodiments of this application.

[0213] 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.

[0214] The energy storage device 2000 includes a cabinet 2100 and a battery cluster 2200, the battery cluster 2200 being housed within the cabinet 2100, and the battery cluster 2200 including a plurality of battery devices 100 of the first aspect.

[0215] Battery clusters 2200 can increase the voltage and capacity of energy storage device 2000. Battery clusters 2200 may include multiple battery devices 100. The multiple battery devices 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.

[0216] 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.

[0217] 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.

[0218] In one specific alternative embodiment of the battery device, please refer to Figure 1 , Figures 3-8 , Figure 12The battery device 100 includes a battery cell assembly 10 and a housing 20. 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 the accommodating space. The first housing 21 includes a first cover 211, a second cover 212, and a busbar 213. The busbar 213 is insulated from the first cover 211. Each battery cell 11 has an electrode terminal 1111 on the side facing the first housing 21. The busbar 213 is electrically connected to the electrode terminals 1111 of two adjacent battery cells 11. The first direction X intersects with the height direction Z of the housing 20. The first cover 211 is provided with a mounting through hole 2113, which includes a first through hole 21131 and a second through hole 21132. The first through hole 21131 and the second through hole 21132 are spaced apart along the first direction X. The busbar 213 includes a first part 2131 and a second part 2132 electrically connected to the first part 2131. Along the height direction Z of the housing 20, at least a portion of the projection of the first part 2131 onto the first cover 211 is within the range of the first through hole 21131, and at least a portion of the projection of the second part 2132 onto the first cover 211 is within the range of the second through hole 21132. In two adjacent battery cells 11, the first part 2131 is electrically connected to the electrode terminal 1111 of one battery cell 11, and the second part 2132 is electrically connected to the electrode terminal 1111 of the other battery cell 11. Along the direction from the first cover 211 to the battery cell 11, a first portion 2131 and a second portion 2132 protrude from the first cover 211. The first cover 211 includes a fiber layer 2111 and a polymer layer 2112. Along the height direction Z of the housing 20, at least one side of the busbar 213 is provided with a fiber layer 2111, and the side of the fiber layer 2111 facing away from the busbar 213 is provided with a polymer layer 2112. The fiber layer 2111 has pores, and a portion of the polymer layer 2112 fills the pores of the fiber layer 2111. The polymer layer 2112 includes any one of a thermosetting material layer and a thermoplastic material layer. The battery cell 11 includes a housing 111, and the side of the housing 111 facing the first housing 21 is provided with an electrode terminal 1111. The first cover 211 is bonded to the housing 111. The second cover 212 is located on the side of the first cover 211 away from the battery cell 11, and the second cover 212 is connected to the first cover 211.There are multiple battery cell assemblies 10 arranged along the second direction Y. The first housing 21 also includes a reinforcing member 214 extending along the first direction X. The reinforcing member 214 is located on the side of the busbar 213 opposite to the first cover 211 and is connected to the first cover 211. There is one reinforcing member 214 for every two adjacent battery cell assemblies 10. The two adjacent battery cell assemblies 10 corresponding to the reinforcing member 214 are the first battery cell assembly 103 and the second battery cell assembly 104, respectively. Along the height direction Z of the housing 20, the projections of the first battery cell assembly 103 and the second battery cell assembly 104 on the first cover 211 intersect with the projection of the reinforcing member 214 on the first cover 211. 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. The reinforcing member 214 is integrally formed with the first cover 211.

[0219] Integrating the busbar 213 into the first housing 21 reduces the space between the traditional first housing 21 and the battery cell 11, making the overall structure more compact and effectively improving the space utilization within the housing 20, thereby increasing the volumetric energy density of the battery device 100. Simultaneously, by covering the first housing 21 with the second housing 22 during welding, the busbar 213 can be directly welded to the electrode terminals 1111, eliminating the need for manual placement or positioning of each busbar 213, simplifying the operation process and improving production efficiency. The reinforcing member 214 is secured by the first locking attachment 215, and the first cover 211 is bonded to the outer shell of the battery cell 11. This enhances the constraint of the first housing 21 on the battery cell 11, helping to increase the main frequency of the battery device 100. In environments with vibration, it reduces the risk of electrical connection failures of internal components caused by vibration, enabling the battery device 100 to operate more stably.

[0220] 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 are connected by snap-fit and jointly define a containing space, the battery cell assembly is located in the containing space, the first box comprises a first cover and a busbar, the busbar is insulatedly connected with the first cover, the battery cell has an electrode terminal on a side facing the first box, the busbar is electrically connected with two different battery cells respectively, and the first direction intersects with a height direction of the box. The first cover is provided with a mounting through hole, in the height direction of the box, among adjacent two electrode terminals of adjacent two battery cells, at least part of the projection of the electrode terminal on the first cover is located in the range of the mounting through hole, and at least part of the projection of the busbar on the first cover is located in the range of the mounting through hole.

2. The battery device according to claim 1, characterized by The mounting through hole comprises a first through hole and a second through hole, which are arranged at intervals along the first direction, the busbar comprises a first part and a second part electrically connected with the first part, along the height direction of the box, at least part of the projection of the first part on the first cover is located in the range of the first through hole, and at least part of the projection of the second part on the first cover is located in the range of the projection of the second through hole on the first cover, among adjacent two battery cells, the first part is electrically connected with the electrode terminal of one battery cell, and the second part is electrically connected with the electrode terminal of another battery cell.

3. The battery device of claim 2, wherein, Along the direction from the first cover to the battery cell, the first part is arranged protruding from the first cover, and / or the second part is arranged protruding from the first cover.

4. The battery device of claim 3, wherein The busbar is integrally formed with the first cover.

5. The battery device of claim 1, wherein Along the height direction of the box, the first cover comprises a fiber layer and a polymer layer, at least one side of the busbar is provided with the fiber layer, and a side of the fiber layer away from the busbar is provided with the polymer layer.

6. The battery device of claim 5, wherein, The fiber layer has pores, and part of the polymer layer is filled in the pores of the fiber layer.

7. The battery device of claim 6, wherein, The polymer layer comprises any one of a thermosetting material layer and a thermoplastic material layer.

8. The battery device of claim 6, wherein, The busbar is bonded with the first cover.

9. The battery device of claim 1, wherein, The battery cell comprises a shell, and the shell is provided with the electrode terminal on a side facing the first box.

10. The battery device according to any one of claims 1 to 9, characterized by, The first cover is bonded with the shell, or the battery cell assembly further comprises an insulating sheet, the insulating sheet is located between the battery cell and the first cover, the shells of different battery cells are connected with the insulating sheet respectively, and the insulating sheet is bonded with the first cover. The first box further comprises a second cover, the second cover is located on a side of the first cover away from the battery cell, and the second cover is connected with the first cover.

11. The battery device according to any one of claims 1 to 9, wherein The side of the first cover away from the battery cell has a groove, the groove comprises a bottom wall, the bottom wall is configured as a protrusion on a side of the first cover facing the battery cell, and the second cover is located in the groove.

12. The battery device of claim 11, wherein, ​ 13. The battery device of claim 11, wherein, The second cover is an insulating member.

14. The battery device of claim 11, wherein, The number of the battery cell assemblies is multiple, and the multiple battery cell assemblies are arranged along a second direction. The first box further comprises a reinforcing member extending along the first direction, the reinforcing member is located between the first cover and the second cover, the reinforcing member is connected with the first cover, and each two adjacent battery cell assemblies correspond to one reinforcing member. The second direction intersects with the first direction, and a plane where the second direction and the first direction are located intersects with the height direction of the box.

15. The battery device of claim 14, wherein, The battery device further comprises a first locking member, the first cover is connected with the second box through the first locking member, and an end of the first locking member sequentially penetrates through the reinforcing member and the first cover.

16. The battery device of claim 14, wherein, The reinforcing member is integrally formed with the first cover.

17. The battery device according to any one of claims 1 to 9, wherein The number of the battery cell assemblies is multiple, and the multiple battery cell assemblies are arranged along a second direction. The first box further comprises a reinforcing member extending along the first direction, the reinforcing member is located on a side of the current collecting member away from the first cover, and the reinforcing member is connected with the first cover. Each two adjacent battery cell assemblies correspond to one reinforcing member. The second direction intersects with the first direction, and a plane where the second direction and the first direction are located intersects with the height direction of the box.

18. The battery device of claim 17, wherein, The battery device further comprises a first locking member, the first cover is connected with the second box through the first locking member, and an end of the first locking member sequentially penetrates through the first cover and the reinforcing member.

19. The battery device of claim 17, wherein, The reinforcing member is integrally formed with the first cover.

20. An electrical device, comprising: The battery device comprises the battery device according to any one of claims 1-19, and the battery device is used for providing electric energy to the electric device.

21. 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 the battery device according to any one of claims 1-19. 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 the battery device according to any one of claims 1-19.

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