Battery device and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery device and electric equipment, and the battery device comprises a box body (20) which is provided with an accommodating space and an opening end communicated with the accommodating space; the at least one battery monomer (10) is positioned in the accommodating space; the structural part (30) is provided with a flange part (31), and the flange part (31) comprises a flange part body (311) and an edge folding part (312) located on at least part of the side edge of the flange part body (311); the reinforcing part (40) is arranged on the structural part (30); wherein the edge folding part (312) is bent inwards, and the edge folding part (312) and the flange part body (311) cover at least part of the reinforcing piece (40) together. The present disclosure can improve the reliability of the connection between the structural member (30) and the mounting interface.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] With the increasing severity of environmental pollution, the new energy industry has attracted more and more attention. In the new energy industry, battery technology is an important factor in its development.

[0003] Rechargeable battery cells, also known as secondary battery cells, are cells that can be recharged after discharge to activate the active material and continue to be used. Rechargeable battery cells are widely used in electronic devices such as mobile phones, laptops, electric bicycles, electric vehicles, electric aircraft, electric boats, electric toy cars, electric toy boats, electric toy planes, and power tools. Further improving the reliability of battery devices is a current research priority. Utility Model Content

[0004] In one aspect of the present disclosure, a battery device is provided, comprising: a box body having a storage space and an open end connected to the storage space; at least one battery cell located in the storage space; a structural member having a flange portion, the flange portion including a flange portion body and a folded edge portion located at at least a portion of a side edge of the flange portion body; and a reinforcement member provided on the structural member; wherein the folded edge portion is bent inwardly and, together with the flange portion body, covers at least a portion of the reinforcement member.

[0005] According to the embodiment of the present disclosure, the folded edge portion of the flange portion and the flange portion body together cover at least a portion of the reinforcement, and the reinforcement of the flange portion side by the reinforcement can improve the ability of the flange portion side to resist vibration and impact, which is beneficial to improving the reliability of the connection between the structural member and the box body, thereby improving the reliability of the battery device, and the folded edge portion and the flange portion body can limit the reinforcement to form a reliable connection between the flange portion and the reinforcement.

[0006] In some embodiments, the folding portion and the flange portion body enclose a folding space, and the reinforcement is located in the folding space and is embedded in the folding space.

[0007] In this embodiment, the interlocking of the reinforcement member and the hem space enables close contact and mechanical interlocking between the reinforcement member, the flange body, and the hem, thereby enhancing the peeling resistance of the reinforcement member and the flange. Furthermore, the interlocking also helps improve the sealing performance of the structural member.

[0008] In some embodiments, the folded edge portions respectively located at two adjacent side edges of the flange body are separated at the corners of the two adjacent side edges.

[0009] In this embodiment, by separating the folded portions at the corners of two adjacent side edges, the risk of the folded portions at the corners of the flange body being overlapped and cracked is reduced.

[0010] In some embodiments, a surface of the reinforcement member away from the flange body includes an arc-shaped cylindrical surface.

[0011] In this embodiment, this cross-sectional shape enhances the guiding effect of the reinforcement during the processing of the hem, and the curvature of the hem formed near the flange body is more natural, which helps reduce the risk of cracking in the hem. Furthermore, this allows for a tight connection between the flange body, the hem, and the reinforcement, significantly increasing the bending stiffness near the connection surface between the structural member and the housing, and reducing deformation under vibration conditions.

[0012] In some embodiments, at least a portion of the gap between the flange portion and the reinforcement is provided with a sealing filler.

[0013] In this embodiment, a sealing filler is provided in the gap, which helps to reduce the risk of impurities such as water vapor entering the gap and causing rust or corrosion.

[0014] In some embodiments, the surface of the reinforcement away from the flange body includes a first surface portion covered by the folded edge portion and a second surface portion not covered by the folded edge portion, and the structural member also includes: a connecting member, which fixes the installation interface of the reinforcement, the flange body and the structural member on the second surface portion.

[0015] In this embodiment, the folded edge portion covers the first surface portion of the reinforcement away from the flange body, which is beneficial to saving material of the folded edge portion and does not require high precision of the reinforcement in the production process, which is beneficial to saving costs and improving production efficiency. In addition, the connection between the flange body and the reinforcement is directly strengthened through the connecting part, and the reinforcement is used to improve the connection reliability between the structural part and the installation interface.

[0016] In some embodiments, the shortest distance from the second surface portion to the flange portion is greater than the shortest distance from the first surface portion to the flange portion, thereby forming a step portion at a connection position between the first surface portion and the second surface portion.

[0017] In this embodiment, forming a step portion at the connection position of the first surface portion and the second surface portion is beneficial to a tighter fit between the flange portion and the reinforcement member on the one hand, and on the other hand, the step portion can be used to sink the folded edge portion, which is beneficial to lowering the height of the outer surface of the folded edge portion, making the appearance quality better, and can reduce the exposure of the outer surface edge of the folded edge portion, reducing the risk of cutting the operator.

[0018] In some embodiments, the folded edge portion abuts against the step portion.

[0019] In this embodiment, the step portion and the folded edge portion offset each other, which enables the folded edge portion to limit the reinforcement member, further improving the stability of the connection between the flange portion and the reinforcement member.

[0020] In some embodiments, sealing fillers are provided between the folded edge portion, the step portion, and the first surface portion, respectively.

[0021] In this embodiment, the sealing filler can reduce the risk of impurities such as water vapor entering the gap between the folded edge portion, the step portion and the first surface portion, causing rust or corrosion.

[0022] In some embodiments, the folded edge portion is bent inward and together with the flange body covers the entire reinforcement in the inward and outward directions, and the portion of the folded edge portion that passes over the reinforcement and extends inward is in contact with the flange body; the structural member also includes: a connecting member, which connects the installation interface of the folded edge portion, the flange body and the structural member at the position where the flange body and the folded edge portion are in contact with each other.

[0023] In this embodiment, the portion of the hem portion extending inward beyond the reinforcement is abutted against the flange body. A connector connects the hem portion, the flange body, and the structural component at the abutment site between the flange body and the hem portion. This allows the connection structure for mating with the connector to be machined after the hem portion is formed, reducing machining and assembly difficulty. For example, if the connection structure is a flange hole, this allows the flange hole on the flange body and the flange hole on the hem portion to be machined simultaneously, resulting in improved coaxiality.

[0024] In some embodiments, the battery device includes a double-layer cover, the structural member is an outer cover of the double-layer cover, and the reinforcement member includes at least a portion of a side edge of an inner cover plate of the double-layer cover.

[0025] In this embodiment, by connecting the inner cover plate to the flange portion, when the structural member and the installation interface are connected, a functional structure can be set on the inner cover plate, and at the same time, at least part of the side of the inner cover plate of the double-layer box cover serves to strengthen the side of the flange portion. This is beneficial for taking into account the functional requirements of the structural member and the stiffness requirements of the flange portion.

[0026] In some embodiments, the structural member is a box cover of the battery device, and the folded edge portion is bent inwardly on a side of the flange body adjacent to the box body, or on a side of the flange body away from the box body.

[0027] In this embodiment, the hem portion is bent inward on the side of the flange body adjacent to the housing to conceal the reinforcement, enhancing the overall appearance of the structural component and improving its appearance quality. Furthermore, this prevents the gap between the hem portion and the reinforcement from being exposed, which helps reduce the amount of water vapor or impurities that enter the gap between the hem portion and the reinforcement. The hem portion is bent inward on the side of the flange body away from the housing to ensure that the flange body is located adjacent to the housing during assembly, and the flange body contacts the housing during assembly. This prevents the reinforcement from contacting the housing, and the requirements for its processing precision can be appropriately reduced, thereby improving production efficiency and reducing costs.

[0028] In another aspect of the present disclosure, an electric device is provided, comprising the battery device according to the foregoing embodiment.

[0029] The electrical equipment using the above-mentioned battery device embodiment has better reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0031] The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0032] Figure 1 is a schematic diagram of some embodiments of the electric device according to the present disclosure;

[0033] Figure 2 is an exploded schematic diagram of some embodiments of the battery device according to the present disclosure;

[0034] Figure 3 is a schematic structural diagram of structural members and reinforcement members according to some embodiments of the battery device disclosed herein;

[0035] Figure 4 (a)-(c) in Figure 3 Schematic diagram of a partial cross-section of AA, wherein Figure 4 (b) in which the reinforcement is omitted;

[0036] Figure 5 yes Figure 3 A schematic diagram of a partial enlargement of point B in the middle;

[0037] Figure 6 yes Figure 4 Schematic partial cross-sectional views of some modified examples of the structural members and reinforcement members of the embodiment of the battery device shown;

[0038] Figure 7 is a schematic structural diagram of structural members and inner cover plates according to some embodiments of the battery device disclosed herein;

[0039] Figure 8 is a partial cross-sectional schematic diagram of a structural member and an inner cover plate according to some embodiments of the battery device disclosed herein;

[0040] Figure 9 (a) and (b) are Figure 4 The partial cross-sectional schematic diagram of other modified examples of the structural members and reinforcement members of the embodiment of the battery device shown in FIG. Figure 9 (b) in the figure omits the flange;

[0041] Figure 10 yes Figure 4 Schematic partial cross-sectional views of further variations of the structural members and reinforcement members of the embodiment of the battery device;

[0042] It should be understood that the size of each part shown in the drawings is not drawn according to the actual proportional relationship.In addition, the same or similar reference numerals represent the same or similar components.

[0043] Reference numerals:

[0044] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 400, axle; 500, wheel;

[0045] 10. Battery cell; 20. Casing; 30. Structural member; 31. Flange; 311. Flange body; 312. Folding portion; 313. Folding space; 32. Sealing filler; 33. Connector; 40. Reinforcement member; 401. First surface portion; 402. Second surface portion; 403. Step portion; 50. Inner cover; 501. Mounting bracket. DETAILED DESCRIPTION

[0046] The following embodiments of the technical solution of the present disclosure are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present disclosure and are therefore only examples and are not intended to limit the scope of protection of the present disclosure.

[0047] Unless otherwise defined, all technical and scientific terms used in the present disclosure have the same meanings as commonly understood by those skilled in the art to which the present disclosure belongs; the terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "including" and "having" and any variations thereof in the specification and claims of the present disclosure and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0048] In the description of the embodiments of the present disclosure, technical terms such as "first" and "second" are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0049] References to "embodiments" in this disclosure mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this disclosure may be combined with other embodiments.

[0050] In the description of the embodiments of the present disclosure, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three possible relationships exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, if the character " / " appears in the present disclosure, it generally indicates that the associated objects are in an "or" relationship.

[0051] In the description of the embodiments of the present disclosure, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0052] In the description of the embodiments of the present disclosure, the term "at least one" refers to one or more than two (including two). Similarly, "at least one group" refers to one or more than two (including two groups), and "at least one piece" refers to one or more than two (including two pieces). In the description of the embodiments of the present disclosure, the term "at least part" refers to part or all.

[0053] Unless otherwise specified, in the description of the embodiments of the present disclosure, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present disclosure.

[0054] In the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0055] The following describes some embodiments of the present invention in detail with reference to the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0056] Battery devices often include structural components to seal or support other components within the device. Thinner structural components can deform along their sides during assembly, impacting sealing or support performance, and reducing the reliability of the connection between the structural component and the mounting interface.

[0057] In view of this, an embodiment of the present disclosure provides a battery device capable of improving the reliability of the connection between a structural member and a mounting interface.

[0058] In one aspect of the present disclosure, a battery device is provided, comprising: a box body having a storage space and an open end connected to the storage space; at least one battery cell located in the storage space; a structural member having a flange portion, the flange portion including a flange portion body and a folded edge portion located at at least a portion of a side edge of the flange portion body; and a reinforcement member provided on the structural member; wherein the folded edge portion is bent inwardly and, together with the flange portion body, covers at least a portion of the reinforcement member.

[0059] According to the embodiment of the present disclosure, by covering at least a portion of the reinforcement member together with the folded edge portion of the flange portion and the flange portion body, the reinforcement member's reinforcing effect on the side of the flange portion can improve the ability of the side of the flange portion to resist vibration and impact, which is beneficial to improving the reliability of the connection between the structural member and the installation interface, thereby improving the reliability of the battery device, and the folded edge portion and the flange portion body can limit the reinforcement member to form a stable and reliable connection between the flange portion and the reinforcement member.

[0060] Figure 1 Figure 1 is a schematic diagram of the structure of some embodiments of electrical devices according to the present disclosure. For convenience, the electrical device is described using a vehicle as an example. Vehicle 1000 can be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle or a hybrid vehicle. Battery device 100 can be installed at the bottom, front, or rear of vehicle 1000.

[0061] 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 of the vehicle 1000 and be used in the circuit system of the vehicle 1000, such as for the power requirements of starting, navigating, and operating the vehicle 1000. The battery device 100 can not only serve as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving force for the vehicle 1000.

[0062] Vehicle 1000 may also be equipped with an axle 400, wheels 500, a motor 300, and a controller 200. The controller 200 controls the battery device 100 to power the motor 300. For example, when the vehicle 1000 is powered by the battery device 100, the controller 200 can provide the motor 300 with the power required for constant speed and acceleration. The motor 300 drives the axle 400 to rotate, thereby driving the wheels 500 to rotate.

[0063] Figure 2 is an exploded schematic diagram of some embodiments of the battery device according to the present disclosure, Figure 3 is a schematic structural diagram of structural members and reinforcement members according to some embodiments of the battery device disclosed herein. Figure 4 (a)-(c) in Figure 3 Schematic diagram of a partial cross-section of AA, wherein Figure 4 In (b), the reinforcement is omitted.

[0064] refer to Figure 2-Figure 4 In some embodiments, the battery device 100 includes a box body 20 having a storage space and an open end connected to the storage space; at least one battery cell 10 located in the storage space; a structural member 30 having a flange portion 31, the flange portion 31 including a flange portion body 311 and a folded edge portion 312 located at at least a portion of the side edge of the flange portion body 311; and a reinforcement member 40 provided on the structural member 30; wherein the folded edge portion 312 is bent inward and, together with the flange portion body 311, covers at least a portion of the reinforcement member 40.

[0065] like Figure 2 As shown, the box body 20 can not only accommodate the battery cells 10, but also provide the battery cells 10 with functions such as cooling, sealing and impact protection, and can also prevent liquids or other foreign matter from adversely affecting the charging and discharging or safety of the battery cells 10. The structural member 30 can be a box cover, which is covered at the end of the box body 20 to close the box body 20. The box body 20 can be as shown in FIG. Figure 2 The shape shown is roughly a rectangular parallelepiped, but it can also be other shapes, such as a cylinder.

[0066] exist Figure 2In the embodiment, the battery cells 10 can be electrically connected in series, parallel or hybrid manners to achieve the required electrical performance parameters of the battery device 100. The battery cells 10 are arranged in rows, and one or more rows of battery cells 10 can be arranged in the box as needed.

[0067] In some embodiments, the battery cells 10 of the battery device 100 may be arranged along at least one of the length and width of the housing 20. As needed, at least one row or column of battery cells 10 may be provided. Alternatively, one or more layers of battery cells 10 may be arranged along the height of the battery device 100.

[0068] In some embodiments, multiple battery cells 10 may be connected in series, parallel, or in series combination to form a battery module. The multiple battery modules are then connected in series, parallel, or in series combination to form a single unit, which is then housed within the housing 20. In other embodiments, all battery cells 10 are directly connected in series, parallel, or in series combination to form a single unit, which is then housed within the housing 20. The electrode terminals of the battery cells 10 may be electrically connected to adjacent battery cells 10 via busbars.

[0069] In the embodiment of the present disclosure, the battery cell 10 may be a secondary battery. A secondary battery refers to a battery cell 10 that can be continuously used by activating active materials by charging after the battery cell 10 is discharged.

[0070] The battery cell 10 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, or the like, and the present disclosure is not limited thereto. The battery cell 10 can be cylindrical, flat, rectangular, or in other shapes, and the present disclosure is not limited thereto. The battery cell 10 is generally categorized by packaging method into cylindrical, prismatic, and soft-pack battery cells, and the present disclosure is not limited thereto either.

[0071] The battery cell 10 of the embodiment of the present disclosure can be applied to various types of battery devices. The battery device mentioned here refers to a physical module including one or more battery cells 10 to provide higher voltage and capacity.

[0072] In some embodiments, the battery device 100 may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0073] The battery cell 10 described in the embodiment of the present disclosure is suitable for battery devices and electrical equipment using the battery cell 10. Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0074] As an example, a battery cell 10 includes an electrode assembly. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. The separator is located between the positive electrode sheet and the negative electrode sheet. The battery cell 10 operates by internal metal ions moving between the positive electrode sheet and the negative electrode sheet. During the charge and discharge process of the battery cell 10, active ions (such as lithium ions) are embedded in and released from the positive electrode sheet and the negative electrode sheet. The separator is located between the positive electrode sheet and the negative electrode sheet to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0075] The positive electrode sheet includes a positive electrode active material layer. The positive electrode sheet may also include a positive electrode current collector substrate, with the positive electrode active material layer disposed on the surface of the positive electrode current collector substrate. For example, the positive electrode active material layer may be disposed on one surface or on two opposite surfaces of the positive electrode current collector substrate in the thickness direction.

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

[0077] As an example, the positive electrode active material layer may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present disclosure is not limited to these materials, and other traditional materials that can be used as positive electrode active material layers may also be used. These positive electrode active material layers may use only one alone, or two or more may be used in combination. Examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of lithium transition metal oxides may 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, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and its modified compounds, etc.

[0078] The negative electrode sheet includes a negative electrode active material layer. The negative electrode sheet may also include a negative electrode current collector substrate, with the negative electrode active material layer disposed on the surface of the negative electrode current collector substrate. For example, the negative electrode active material layer may be disposed on one surface or on two opposite surfaces of the negative electrode current collector substrate in the thickness direction.

[0079] As examples, the negative electrode current collector substrate can be a metal foil, metal foam, or composite current collector. For example, the metal foil can include silver-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium. Metal foams can include nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. A composite current collector can include a polymer base layer and a metal layer. The composite current collector can be formed by depositing a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) on a polymer substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0080] As an example, the negative electrode active material layer may adopt the negative electrode active material layer for the battery cell 10 that is well known in the art. As an example, the negative electrode active material layer may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present disclosure is not limited to these materials, and other traditional materials that can be used as negative electrode active material layers may also be used. These negative electrode active material layers may be used alone or in combination of two or more.

[0081] In some embodiments, the separator is a membrane. The present disclosure has no particular limitation on the type of the membrane, and the separator can be any known porous structure separator with good chemical stability and mechanical stability.

[0082] 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 separate component located between the positive electrode sheet and the negative electrode sheet, or it can be located between the positive electrode sheet and the negative electrode sheet and attached to the surface of the positive electrode sheet and / or the surface of the negative electrode sheet.

[0083] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode, and serves to transmit ions and isolate the positive and negative electrodes.

[0084] In some embodiments, the battery cell 10 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present disclosure does not specifically limit the type of electrolyte, and the electrolyte may be selected based on needs. The electrolyte may be liquid, gel, or solid.

[0085] As an example, the liquid electrolyte includes an electrolyte salt and a solvent.

[0086] In some embodiments, the electrolyte salt can 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 difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0087] In certain embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent 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, methyltetrahydrofuran, diphenyl ether and crown ether.

[0088] As an example, a gel electrolyte includes a polymer as an electrolyte skeleton network, combined with an ionic liquid-lithium salt.

[0089] As examples, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0090] As an example, the polymer solid electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, etc.

[0091] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0092] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0093] like Figure 3 As shown, the structural member 30 has a flange portion 31 , which may be located at a side of the structural member 30 . The flange portion 31 may be provided with, for example, a flange hole for connecting the structural member 30 with the mounting interface.

[0094] In this embodiment and the following embodiments, the installation interface may refer to the interface of the installation position of the structural member 30 .

[0095] The structural member 30 may be, for example, a cover of the battery device 100 , which may be covered on the end of the box body 20 to close the box body 20 . In this case, the interface at the open end of the box body 20 for connecting with the cover serves as the mounting interface of the structural member 30 .

[0096] A window may be provided on the box body 20 or the box cover, and the structural member 30 may be, for example, a window panel to seal the window. In this case, the interface at the window on the box body 20 or the box cover for connecting with the window panel is the installation interface of the structural member 30 .

[0097] The structural member 30 may also be, for example, an inner lining plate. This refers to a structure provided on the lid or within the housing 20 that supports, connects, or secures other components of the battery device 100. The inner lining plate may be, for example, a functional lining plate provided on the inside of the lid or a reinforcing lining plate provided within the housing 20. In this case, the interface on the housing 20 or lid that connects to the inner lining plate serves as the mounting interface for the structural member 30. A reinforcement member 40 is provided on the structural member 30 and connected to the flange portion 31, thereby reinforcing the flange portion 31.

[0098] The materials of the structural member 30 and the reinforcement member 40 include, but are not limited to, metal (steel, aluminum) or composite materials (such as carbon fiber reinforced plastic). The connection method between the structural member 30 and the installation interface includes, but is not limited to, bolt connection or riveting.

[0099] like Figure 3 and Figure 4 As shown in (a) of FIG. 3 , the flange portion 31 includes a flange portion body 311 and a folded edge portion 312. The flange portion body 311 may be a strip-shaped flat plate. Figure 3 As shown, the flange hole for connecting the structural member 30 with the mounting interface can be provided on the flange body 311 .

[0100] exist Figure 3 and Figure 4 In (a), the hem 312 of the flange 31 is connected to at least a portion of the side of the flange body 311. The hem 312 bends inward and, together with the flange body 311, covers at least a portion of the reinforcement 40. The boundary between the hem 312 and the flange body 311 can be the point where the horizontal extension direction of the side of the flange body 311 begins to change, that is, the point where the inward bend begins. Here, the hem 312 bends inward and, together with the flange body 311, can cover the entire reinforcement 40, or a portion of the reinforcement 40.

[0101] Covering the entire reinforcement member 40 means that the side of the reinforcement member 40 adjacent to the installation interface of the structural member 30 and the side of the reinforcement member 40 away from the installation interface of the structural member 30 are covered by the folded portion 312 and the flange portion body 311. Covering a portion of the reinforcement member 40 means that a portion of the reinforcement member 40 along the inner and outer directions is covered by the folded portion 312 and the flange portion body 311. It can also mean that a portion of the reinforcement member 40 along the length direction of the side of the flange portion body 311 is covered by the folded portion 312 and the flange portion body 311. For example, along the length direction of the side of the flange portion body 311, the folded portion 312 discretely or continuously covers a portion of the reinforcement member 40. This will be described in detail in the following embodiments.

[0102] During the manufacturing phase, the flange portion 31 can be pre-retained at its edge. This excess material can then be processed into an inwardly bent hem portion 312 through processes such as high-speed rolling or hemming. During the process of forming the hem portion 312, the reinforcement member 40 can also serve as a guide, reducing the risk of cracking in the hem portion 312, improving product quality, and also helping to reduce the total number of parts and assembly steps in the structural member 30, thereby improving production efficiency. Furthermore, the present disclosure also results in a smooth and neat appearance for the structural member 30, which helps improve its appearance quality and reduces defects such as horseshoe points caused by processes such as welding during processing.

[0103] In this embodiment, the folded edge portion 312 of the flange portion 31 and the flange portion body 311 together cover at least a portion of the reinforcement 40. The reinforcement of the flange portion 31 by the reinforcement 40 can improve the ability of the flange portion 31 to resist vibration and impact, which is beneficial to improving the reliability of the connection between the structural member 30 and the installation interface, thereby improving the reliability of the battery device 100. In addition, the folded edge portion 312 and the flange portion body 311 can limit the reinforcement 40 to form a reliable connection between the flange portion 31 and the reinforcement 40.

[0104] refer to Figure 4 In (a) and (b), in some embodiments, the folded edge portion 312 and the flange portion body 311 enclose a folded edge space 313 , and the reinforcement member 40 is located in the folded edge space 313 and is embedded in the folded edge space 313 .

[0105] The term "fitting" herein refers to a close fit between the reinforcement member 40 and the hem space 313 through complementary shapes. For example, the shape of the hem space 313 allows the reinforcement member 40 to fit closely with the flange body 311 and the hem portion 312 within the hem space 313, or the hem portion 312 and the reinforcement member 40 may be elastically or plastically deformed during the process of forming the hem portion 312.

[0106] In actual operating conditions, the reinforcement 40 or the flange portion 31 may be subjected to forces that separate them (e.g., shear and / or vertical forces), causing them to peel. This contact or plastic deformation creates close contact and mechanical interlocking between the reinforcement 40, the flange portion body 311, and the hem portion 312. The force (e.g., friction) between the reinforcement 40 and the flange portion 31 limits their relative movement, improving their ability to resist peeling and thus enhancing the peeling resistance of the structural component 30. Furthermore, the interlocking area is less susceptible to the ingress of impurities such as water vapor, which helps improve the corrosion resistance of the structural component 30 and the reinforcement 40.

[0107] Figure 5 yes Figure 3 A schematic diagram of the local enlargement of point B in the middle. Figure 5 In some embodiments, the folded edge portions 312 located at two adjacent side edges of the flange body 311 are separated at the corners of the two adjacent side edges.

[0108] like Figure 5 As shown, an avoidance notch can be provided at the corner of the flange body 311, and no folded edge portion 312 is provided at the avoidance notch.

[0109] In this embodiment, by separating the folded edge portions 312 at the corners of two adjacent sides, the risk of the folded edge portions 312 at the corners of the flange body 311 being overlapped and cracked is reduced.

[0110] refer to Figure 4 In (a) and (c), in some embodiments, a sealing filler 32 is provided in at least a portion of the gap between the flange portion 31 and the reinforcement member 40 .

[0111] like Figure 4 As shown in (a) and (c) in FIG. 1 , a gap may be formed between the flange portion 31 and the reinforcement member 40 at the bend of the hem portion 312 , and a gap may be formed between the reinforcement member 40 and the hem portion 312 ( Figure 4 Not shown, will be combined below Figure 9 (e.g., as discussed above), impurities such as water vapor may enter this gap, causing rust or corrosion at the connection between the flange portion 31 and the reinforcement member 40. A sealing filler 32 may be provided at the starting position of this gap and at a predetermined depth extending from the starting position into the gap. The starting position of the gap may be, for example, the position of the folded edge portion 312 at the junction of the avoidance notch, and the predetermined depth may be, for example, part or all of the length of the folded edge portion 312 extending along the side.

[0112] The sealing filler 32 may be, but is not limited to, sealant or the like.

[0113] In this embodiment, a sealing filler 32 is provided in the gap, which helps to reduce the risk of impurities such as water vapor entering the gap and causing rust or corrosion.

[0114] Figure 6 yes Figure 4 The schematic partial cross-sectional views of some modified examples of the structural components of the embodiment of the battery device are shown. Figure 6 In some embodiments, the surface of the reinforcement member 40 away from the flange body 311 is an arc-shaped cylindrical surface.

[0115] Here, the arc-shaped cylindrical surface can be, for example, at least a portion of a cylindrical surface or an elliptical cylindrical surface. In some embodiments, the reinforcement 40 can be as follows: Figure 6 The reinforcing member 40 may also be a mandrel with a semicircular cross section, with one side of the semi-cylindrical surface being disposed away from the flange body 311 .

[0116] This cross-sectional shape allows the reinforcement 40 to provide a stronger guide when machining the folded portion 312. The folded portion 312 forms a more natural curvature near the flange body 311, which helps reduce the risk of cracking in the folded portion 312. Furthermore, this allows for a tight connection between the flange body 311, the folded portion 312, and the reinforcement 40, significantly increasing the bending stiffness near the connection surface between the structural member 30 and the mounting interface, and reducing deformation under vibration conditions.

[0117] Figure 7 is a schematic structural diagram of structural members and inner cover plates according to some embodiments of the battery device disclosed herein. Figure 8 1 is a partial cross-sectional view of the structural members and inner cover plate of some embodiments of the battery device according to the present disclosure. Figure 7 and Figure 8 In some embodiments, the battery device 100 includes a double-layer cover, the structural member 30 is an outer cover of the double-layer cover, and the reinforcement member 40 includes at least a portion of a side of an inner cover plate of the double-layer cover.

[0118] like Figure 7 As shown, the inner cover 50 of the double-layered case lid can be provided with functional structures, such as a mounting bracket 501 for mounting other components of the battery device 100. Alternatively, the inner cover 50 can be the mounting bracket 501 itself. Furthermore, the side edges of the inner cover 50 serve as reinforcements 40, which are covered by the hem 312 and the flange body 311, thereby strengthening the flange 31 by the reinforcements 40.

[0119] like Figure 8 As shown, the connecting member 33 passes through the inner cover plate 50 and the flange portion 31 and connects the inner cover plate 50 and the flange portion 31 with the installation interface of the structural member 30 so as to fix the structural member 30 to the installation interface.

[0120] In this embodiment, by connecting the inner cover plate 50 to the flange portion 31, when the structural member 30 and the installation interface are connected, a functional structure can be provided on the inner cover plate 50, and at the same time, at least a portion of the side of the inner cover plate of the double-layer box cover serves to reinforce the side of the flange portion 31. This is beneficial for taking into account both the functional requirements of the structural member 30 and the stiffness requirements of the flange portion 31.

[0121] refer to Figure 6 In some embodiments, the folded edge portion 312 bends inward and together with the flange body 311 covers the entire reinforcement 40 in the inward and outward directions. The portion of the folded edge portion 312 that passes over the reinforcement 40 and extends inward is in contact with the flange body 311. The structural member 30 also includes a connecting member 33, which connects the folded edge portion 312, the flange body 311 and the installation interface at the position where the flange body 311 and the folded edge portion 312 are in contact with each other.

[0122] This allows the connection structure for mating with the connector 33 to be fabricated after the folded edge portion 312 is formed, reducing the difficulty of processing and assembly, especially when processing and assembly are performed on an automated production line. For example, if the connection structure is a flange hole, this allows the flange hole on the flange body 311 and the flange hole on the folded edge portion 312 to be formed in one process, resulting in better coaxiality.

[0123] refer to Figure 4 In (a), in some embodiments, the surface of the reinforcement member 40 away from the flange body 311 includes a first surface portion 401 covered by the folded portion 312 and a second surface portion 402 not covered by the folded portion 312, and the structural member 30 further includes a connecting member 33 ( Figure 4 (not shown), the connecting member 33 securely connects the reinforcement member 40, the flange body 311 and the mounting interface of the structural member 30 at the second surface portion 402.

[0124] like Figure 4 As shown in (a), the folded edge portion 312 does not completely cover the surface of the reinforcement member 40, but covers the first surface portion 401 thereof. Furthermore, the connecting member 33 directly connects the reinforcement member 40 to the flange body 311, and together with the folded edge portion 312, limits the position of the reinforcement member 40.

[0125] This reduces the material used in the hem 312 and reduces the precision requirements for the reinforcement 40 during the production process, which helps save costs and improve production efficiency. Furthermore, this directly strengthens the connection between the flange body 311 and the reinforcement 40 via the connector 33, thereby improving the reliability of the connection between the structural member 30 and the mounting interface.

[0126] Figure 9 (a) and (b) are Figure 4 The partial cross-sectional schematic diagram of other modified examples of the structural members and reinforcement members of the embodiment of the battery device shown in FIG. Figure 9 The flange is omitted in (b). Figure 9 In (a) and (b), in some embodiments, the shortest distance from the second surface portion 402 to the flange portion 31 is greater than the shortest distance from the first surface portion 401 to the flange portion 31, thereby forming a step portion 403 at the connection position between the first surface portion 401 and the second surface portion 402.

[0127] This not only facilitates a tighter fit between the flange 31 and the reinforcement 40, but also allows the folded edge 312 to sink, thereby reducing the height of the outer surface of the folded edge 312, making the entire structural member 30 smoother, thereby improving the appearance quality, and reducing the exposure of the outer edge of the folded edge 312, thereby reducing the risk of cutting the operator. Figure 9 As shown in (a), the distance from the first surface portion 401 to the second surface portion 402 may be equal to the thickness of the hem portion 312 .

[0128] refer to Figure 9 In (a) and (b), in some embodiments, the folded edge portion 312 abuts against the step portion 403 .

[0129] In this way, the folded edge portion 312 can limit the reinforcement member 40, further improving the stability of the connection between the flange portion 31 and the reinforcement member 40.

[0130] In some embodiments, the reinforcement member 40 may be made of a composite material (such as carbon fiber reinforced plastic, engineering plastic, etc.) to facilitate processing of the step portion 403 while reducing the weight and cost of the battery device 100. The reinforcement member 40 may also be made of metal to increase its rigidity.

[0131] like Figure 9 As shown in (a) in FIG. 1 , sealing fillers 32 are provided between the folded edge portion 312 and the step portion 403 and the first surface portion 401 .

[0132] In this way, the sealing filler 32 can reduce the risk of impurities such as water vapor entering the gap between the folded edge portion 312 and the step portion 403 and the first surface portion 401, causing rust or corrosion.

[0133] Figure 10 yes Figure 4 Schematic partial cross-sectional view of some further modified examples of the structural members and reinforcement members of the embodiment of the battery device shown. Figure 4 and Figure 10In some embodiments, the folded edge portion 312 is bent inward on a side of the flange body 311 adjacent to the box body 20 , or on a side of the flange body 311 away from the box body 20 .

[0134] The folding portion 312 is bent inward on the side of the flange body 311 adjacent to the box body 20 to achieve the built-in concealment of the reinforcement 40, making the appearance of the structural member 30 more integrated and improving the appearance quality. In addition, this also prevents the gap between the folding portion 312 and the reinforcement 40 from being exposed, which is beneficial to reducing water vapor or impurities entering the gap between the folding portion 312 and the reinforcement 40.

[0135] The folded edge 312 is bent inward on the side of the flange body 311 away from the box body 20, so that the flange body 311 is located on the side adjacent to the box body 20 during assembly, and the flange body 311 contacts the box body 20 during assembly. In this way, the reinforcement member 40 does not contact the box body 20, and the requirements for its processing accuracy can be appropriately reduced, thereby improving production efficiency and reducing costs.

[0136] Based on the various embodiments of the battery device 100 described above, an embodiment of the present disclosure provides an electric device, including the aforementioned battery device 100. The electric device using the embodiments of the battery device 100 described above has good reliability.

[0137] The following is a description of a specific embodiment of the battery device disclosed herein. Figure 2-Figure 4 、 Figure 8 and Figure 10 The battery device 100 includes a housing 20 , a structural member 30 , a reinforcement member 40 , and a plurality of battery cells 10 disposed in the housing 20 .

[0138] The structural member 30 has a flange portion 31 , which includes a flange body 311 and a folded edge portion 312 . The folded edge portion 312 is connected to at least part of the side of the flange body 311 . The folded edge portion 312 is bent inward and together with the flange body 311 covers at least part of the reinforcement 40 .

[0139] The folded portion 312 and the flange body 311 enclose a folded space 313 . The reinforcement member 40 is located in the folded space 313 , and the reinforcement member 40 and the folded space 313 are interlocked.

[0140] The surface of the reinforcement 40 away from the flange body 311 includes a first surface portion 401 covered by the folding portion 312 and a second surface portion 402 not covered by the folding portion 312. The structural member 30 also includes a connecting member 33, which fixes the reinforcement 40, the flange body 311 and the box body 20 on the second surface portion 402.

[0141] The shortest distance from the second surface portion 402 to the flange portion 31 is greater than the shortest distance from the first surface portion 401 to the flange portion 31 , thereby forming a step portion 403 at the connection between the first surface portion 401 and the second surface portion 402 .

[0142] A sealing filler 32 is provided in at least part of the gap between the flange 31 and the reinforcement 40. The structural member 30 is a cover of the battery device 100, and the folded edge 312 is bent inwardly on a side of the flange body 311 adjacent to the box body 20.

[0143] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0144] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A battery device, characterized in that: include: A box body (20) having a receiving space and an open end communicating with the receiving space; At least one battery cell (10) is located in the accommodation space; A structural member (30) having a flange portion (31), wherein the flange portion (31) includes a flange portion body (311) and a folded edge portion (312) located at at least a portion of a side edge of the flange portion body (311); and A reinforcement member (40) is provided on the structural member (30); The folded edge portion (312) is bent inward and, together with the flange portion body (311), covers at least a portion of the reinforcement member (40).

2. The battery device according to claim 1, wherein: The folding portion (312) and the flange portion body (311) enclose a folding space (313), and the reinforcement member (40) is located in the folding space (313) and is engaged with the folding space (313).

3. The battery device according to claim 1, wherein: The folded edge portions (312) respectively located on two adjacent side edges of the flange portion body (311) are separated at the corners of the two adjacent side edges.

4. The battery device according to claim 1, wherein: The surface of the reinforcement member (40) on the side away from the flange body (311) includes an arc-shaped cylindrical surface.

5. The battery device according to claim 1, wherein: At least part of the gap between the flange portion (31) and the reinforcement member (40) is provided with a sealing filler (32).

6. The battery device according to claim 1, wherein: The surface of the reinforcement member (40) on the side away from the flange body (311) includes a first surface portion (401) covered by the folded edge portion (312) and a second surface portion (402) not covered by the folded edge portion (312). The structural member (30) further includes: The connecting member (33) is used to fix the installation interface of the reinforcing member (40), the flange body (311) and the structural member (30) on the second surface portion (402).

7. The battery device according to claim 6, characterized in that The shortest distance from the second surface portion (402) to the flange portion (31) is greater than the shortest distance from the first surface portion (401) to the flange portion (31), thereby forming a step portion (403) at a connection position between the first surface portion (401) and the second surface portion (402).

8. The battery device according to claim 7, characterized in that The folded edge portion (312) abuts against the step portion (403).

9. The battery device according to claim 8, characterized in that Sealing fillers (32) are provided between the folded edge portion (312), the step portion (403), and the first surface portion (401).

10. The battery device according to claim 1, wherein: The folded edge portion (312) is bent inwardly and, together with the flange portion body (311), covers the entire reinforcement member (40) in the inward and outward directions. The portion of the folded edge portion (312) that extends inwardly beyond the reinforcement member (40) is in contact with the flange portion body (311). The structural member (30) further comprises: The connecting member (33) connects the installation interface of the folding portion (312), the flange body (311) and the structural member (30) at a location where the flange body (311) and the folding portion (312) are in contact with each other.

11. The battery device according to claim 1, wherein: The battery device comprises a double-layer box cover, the structural member (30) is an outer cover of the double-layer box cover, and the reinforcing member (40) comprises at least a portion of a side edge of an inner cover plate (50) of the double-layer box cover.

12. The battery device according to claim 1, wherein: The structural member (30) is a box cover of the battery device, and the folded edge portion (312) is bent inwardly on a side of the flange body (311) adjacent to the box body (20), or on a side of the flange body (311) away from the box body (20).

13. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1 to 12.

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