Battery device and electric device

Abstract

The present application belongs to the technical field of batteries. Disclosed are a battery device and an electric device. The battery device comprises a battery cell assembly and a case. The case comprises an inner frame, an outer frame, a support plate and a connecting component, wherein the inner frame is arranged inside the outer frame, the outer peripheral side of the inner frame being spaced apart from the inner peripheral side of the outer frame; the connecting component connects the inner frame and the outer frame; the support plate is connected to the inner frame and forms a first compartment for accommodating the battery cell assembly; the support plate bears the battery cell assembly; and the support plate is spaced apart from the outer frame. The described battery device is highly reliable.

Description

Battery devices and electrical appliances Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Improving the reliability of battery devices is a pressing issue in battery technology. Summary of the Invention

[0004] In view of the above problems, this application provides a battery device and an electrical device that can improve the reliability of the battery device.

[0005] In a first aspect, this application provides a battery device, which includes a battery cell assembly and a housing. The housing includes an inner frame, an outer frame, a support plate, and a connecting component. The inner frame is disposed inside the outer frame, and the outer periphery of the inner frame is spaced apart from the inner periphery of the outer frame. The connecting component connects the inner frame and the outer frame. The support plate is connected to the inner frame and forms a first compartment for accommodating the battery cell assembly. The support plate carries the battery cell assembly and is spaced apart from the outer frame.

[0006] In the technical solution of this application embodiment, the support plate is connected to the inner frame, together forming a first compartment for accommodating the battery cell assembly, wherein the support plate directly bears the load-bearing function of the battery cell assembly. This structure constructs a double thermal barrier by setting gaps between the outer periphery of the inner frame and the inner periphery of the outer frame, and between the support plate and the outer frame. When heat generated by the battery cell assembly is transferred to the outside of the housing, its heat conduction path must sequentially pass through the gap area between the inner and outer frames and the gap area between the support plate and the outer frame. These two air gaps effectively prevent the formation of thermal bridges. This layered thermal insulation design helps to stably control the operating temperature of the battery cell assembly within the optimal operating range, improving the reliability of the battery device.

[0007] In one or more embodiments of the first aspect, the interior of the support plate is formed with channels for accommodating the heat exchange medium.

[0008] In the above scheme, the support plate serves both structural support and thermal management functions within the battery device, enabling a more compact battery layout and thus improving overall energy density. Furthermore, the gap between the support plate and the outer frame forms an air gap, effectively reducing the interference of external ambient temperature on the heat exchange medium and ensuring high heat exchange efficiency.

[0009] In one or more embodiments of the first aspect, in the same projection plane perpendicular to the thickness direction of the support plate, the outer edge of the orthographic projection of the support plate and the inner edge of the orthographic projection of the outer frame are spaced apart.

[0010] In the above solution, by setting the thickness direction of the support plate as the assembly positioning reference, the assembly accuracy between the support plate and the outer frame can be improved. This allows for precise control of the gap between the two, which is beneficial to the heat transfer efficiency of the battery device. Furthermore, this design also facilitates the automated production of the battery device.

[0011] In one or more embodiments of the first aspect, the inner frame includes two first internal beams and two second internal beams, the two first internal beams are spaced apart along a first direction, the two second internal beams are spaced apart along a second direction, the first internal beams connect the two second internal beams, and the second direction, the first direction and the thickness direction of the support plate are perpendicular to each other.

[0012] In the above scheme, the first and second internal beams can serve as assembly references for each other, thereby reducing the assembly difficulty of the box body. Simultaneously, the first internal beam connects the two second internal beams, which improves the structural stability of the inner frame.

[0013] In one or more embodiments of the first aspect, the outer frame includes two first side beams and two second side beams, the two first side beams being spaced apart along a first direction, and the two second side beams being spaced apart along a second direction. Along the first direction, a first inner beam is spaced apart from the first side beams; along the second direction, a second inner beam is spaced apart from the second side beams.

[0014] In the above scheme, the gap between the first internal beam and the first side beam, as well as the gap between the second internal beam and the second side beam, effectively prevent the formation of thermal bridges, which helps to stably control the operating temperature of the battery cell assembly within the optimal operating range and improves the reliability of the battery device.

[0015] In one or more embodiments of the first aspect, the battery cell assembly includes a plurality of battery cells stacked along a first direction. The battery device further includes a heat insulation pad disposed at at least one end of the battery cell assembly along the first direction.

[0016] In the above solution, the installation of the heat insulation pad can reduce the heat loss of the battery cell assembly in the path from the heat of the battery cell assembly to the outside of the housing in the first direction, thereby further improving the heat preservation performance of the battery device.

[0017] In one or more embodiments of the first aspect, a cavity is provided inside the heat insulation pad.

[0018] In the above scheme, the air layer inside the cavity can further improve the heat insulation performance of the heat insulation pad, thereby further improving the heat preservation performance of the battery device.

[0019] In one or more embodiments of the first aspect, the thermal conductivity of the insulation pad is less than that of the inner frame.

[0020] In the above solution, since the thermal conductivity of the heat insulation pad is less than that of the inner frame, the difficulty of heat exchange between the battery cell assembly and the inner frame is increased. In turn, the risk of excessive heat loss from the battery cell assembly to the outside of the housing through the inner frame and the outer frame is further reduced, thus improving the heat preservation performance of the battery device.

[0021] In one or more embodiments of the first aspect, the material of the heat insulation pad includes fiber-reinforced composite material, and the material of the inner frame includes metal.

[0022] In the above solution, while improving the thermal insulation performance of the battery device, the heat insulation pad, which includes fiber-reinforced composite material, and the inner frame, which includes metal, can improve the structural strength of the housing.

[0023] In one or more embodiments of the first aspect, the housing further includes a partition beam that divides the first compartment into multiple first sub-compartments. Multiple battery cell assemblies are provided, and each battery cell assembly corresponds to one of the multiple first sub-compartments. Each battery cell assembly is located in its corresponding first sub-compartment.

[0024] In the above scheme, the first sub-compartment can serve as the assembly reference for its corresponding battery cell module, which helps to reduce the assembly difficulty of the battery device and improve the assembly efficiency of the battery device.

[0025] In one or more embodiments of the first aspect, a plurality of partition beams are provided, the plurality of partition beams including a first sub-partition beam and a second sub-partition beam, the first sub-partition beam extending along a second direction, the second sub-partition beam extending along a first direction, the second direction, the first direction and the thickness direction of the support plate being perpendicular to each other.

[0026] In the above scheme, the extension directions of the first sub-dividing beam, the extension direction of the second sub-dividing beam, and the thickness direction of the support plate are perpendicular to each other, which can simplify the assembly difficulty of multiple sub-dividing beams.

[0027] In one or more embodiments of the first aspect, a plurality of connecting members are provided, and the plurality of connecting members are spaced apart along the circumferential direction of the inner frame.

[0028] In the above solution, multiple connecting components can improve the connection stability of the inner frame. Furthermore, since multiple connecting components are spaced apart circumferentially along the inner frame, external forces can be more effectively dispersed, reducing the risk of localized stress concentration and improving the reliability of the enclosure.

[0029] In one or more embodiments of the first aspect, multiple connecting components are provided, including a first connecting component integrally formed with the inner frame; and / or, the multiple connecting components include a second connecting component integrally formed with the inner frame.

[0030] In the above solution, the connecting parts and the inner frame are processed by integral molding, which can simplify the assembly process of the battery device and reduce the risk of connection failure due to weak areas between the connecting parts and the inner frame.

[0031] In one or more embodiments of the first aspect, multiple connecting components are provided, and the multiple connecting components include a third connecting component, which is separately formed from the inner frame.

[0032] In the above solution, the third connecting component is separately formed from the inner frame, which improves the connection stability of the inner frame, reduces the cost of the battery device, and improves the convenience of maintenance of the housing.

[0033] In one or more embodiments of the first aspect, the housing further includes a bottom plate connected to the outer frame, and the bottom plate is located on the side of the support plate away from the battery cell assembly along the thickness direction of the support plate.

[0034] In the above solution, the spacing between the support plate and the outer frame improves the thermal insulation performance of the battery device, while the base plate reduces the risk of foreign objects entering the box and damaging the battery cells, thus improving the reliability of the battery device.

[0035] In one or more embodiments of the first aspect, the support plate and the base plate are spaced apart along the thickness direction of the support plate.

[0036] In the above scheme, the support plate and the base plate are spaced apart along the thickness direction of the support plate, creating a gap between them. When the heat generated by the battery cell module is transferred to the outside of the housing, its heat conduction path must pass through the gap area between the support plate and the base plate in sequence. The air gap effectively blocks the formation of thermal bridges, further improving the thermal insulation performance and reliability of the battery device.

[0037] In one or more embodiments of the first aspect, a heat-insulating material is provided between the support plate and the base plate.

[0038] In the above scheme, the addition of heat insulation material can increase the difficulty of heat exchange between the support plate and the base plate, thereby further improving the heat preservation performance of the battery device.

[0039] In one or more embodiments of the first aspect, the outer frame includes a first outer frame and a second outer frame, an inner frame is disposed inside the first outer frame, and the outer periphery of the inner frame is spaced apart from the inner periphery of the first outer frame; the second outer frame is disposed outside the first outer frame, the second outer frame is connected to the first outer frame and surrounds the bottom plate to form a second compartment; wherein, the battery device further includes an electronic control module, and the electronic control module is disposed in the second compartment.

[0040] In the above scheme, since the outer periphery of the inner frame is spaced apart from the inner periphery of the first outer frame, there is a gap between the inner frame and the first outer frame. When the heat generated by the battery cell assembly is transferred to the second compartment, its heat conduction path must pass through the gap area between the inner frame and the first outer frame in sequence. The air gap effectively blocks the formation of thermal bridges, which can improve the reliability of the electronic control module.

[0041] In one or more embodiments of the first aspect, the first compartment and the second compartment are spaced apart along a first direction, and the battery device further includes a battery management unit disposed between the first compartment and the second compartment along the first direction.

[0042] In the above scheme, the gap between the first and second compartments not only improves the thermal insulation performance of the battery device, but also accommodates the battery management unit, making the battery device structure more compact and improving the energy density of the battery device.

[0043] Secondly, this application provides an electrical device that includes the battery device described in one or more of the above embodiments, the battery device being used to provide electrical energy.

[0044] In the above solutions, since the battery device in one or more of the above embodiments has high reliability, the power supply device including the battery device in one or more of the above embodiments also has high reliability.

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

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

[0047] Figure 1 is a schematic diagram of the vehicle structure according to some embodiments of this application;

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

[0049] Figure 3 is an exploded view of a battery cell according to some embodiments of this application;

[0050] Figure 4 is a schematic diagram of the structure of the box in some embodiments of this application;

[0051] Figure 5 is an isometric view of the housing according to some embodiments of this application;

[0052] Figure 6 is a structural schematic diagram of the box body in some embodiments of this application;

[0053] Figure 7 is a schematic diagram of a portion of the box structure according to some embodiments of this application;

[0054] Figure 8 is a schematic diagram of a portion of the structure of a battery device according to some embodiments of this application;

[0055] Figure 9 is a cross-sectional view of a portion of the structure of a battery device according to some embodiments of this application;

[0056] Figure 10 is a cross-sectional view of a portion of the structure of a battery device according to some other embodiments of this application;

[0057] Figure 11 is a cross-sectional view of a portion of the structure of a battery device according to some embodiments of this application;

[0058] Figure 12 is a magnified view of part A in Figure 5.

[0059] The reference numerals in the detailed embodiments are as follows:

[0060] 1000 - Vehicle; 200 - Controller; 300 - Motor; 100 - Battery Unit; 11 - Housing; 111 - First Housing; 112 - Second Housing; 113 - Base Plate; 114 - Outer Frame; 1141 - First Outer Frame; 11411 - First Side Beam; 11412 - Second Side Beam; 1142 - Second Outer Frame; 11421 - Third Side Beam; 11422 - Fourth Side Beam; 1145 - Connecting Port; 115 - First Compartment; 1151 - First Sub-Compartment; 116 - Second Compartment; 117 - Connecting Component; 1171 - First Connecting Component; 1172 - Second Connecting Component; 1173 - Third Connecting Component; 118-Inner frame; 1181-First internal beam; 1182-Second internal beam; 119-Support plate; 1191-Flow channel; 120-Heat insulation pad; 1201-Cavity; 125-Separation beam; 1251-First sub-separation beam; 1252-Second sub-separation beam; 126-Electronic control module; 127-Battery management unit; 101-Battery cell assembly; 1011-End plate; 12-Battery cell; 121-Outer shell; 1211-End cap; 1212-Shell; 122-Electrode assembly; 123-Electrode terminal; 124-Adapter piece; X-First direction; Y-Second direction; Z-Thickness direction of support plate. Detailed Implementation

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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).

[0066] In this embodiment of the application, 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.

[0067] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0068] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. 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, reduces the risk of short circuits while allowing active ions to pass through.

[0069] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0070] 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.

[0071] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0072] 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 positive electrode active materials for batteries 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 manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, at least one of lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co0.25Mn0.25O2 (also abbreviated as NCM211), LiNi0.6Co0.2Mn0.2O2 (also abbreviated as NCM622), LiNi0.8Co0.1Mn0.1O2 (also abbreviated as NCM811), lithium nickel cobalt aluminum oxides (such as LiNi0.85Co0.15Al0.05O2) and their modified compounds.

[0073] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, 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, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0074] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0075] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Foamed metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0076] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0077] 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.

[0078] 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 battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0079] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0080] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical and mechanical stability.

[0081] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0082] 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.

[0083] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0084] In some embodiments, the electrolyte salt may include 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.

[0085] In some embodiments, the solvent may include at least one selected from 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 selected from 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.

[0086] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0087] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0088] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0089] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0090] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0091] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0092] In some implementations, the electrode assembly is a stacked structure.

[0093] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0094] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0095] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0096] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0097] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0098] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0099] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0100] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0101] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0102] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0103] 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.

[0104] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; 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 a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0105] 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.

[0106] 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.

[0107] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0108] 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.

[0109] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0110] The following discussion will primarily focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable in some respects to cylindrical battery cells, pouch cell cells, or blade cell cells.

[0111] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge / discharge rate and other performance parameters. In addition, the reliability of the battery device also needs to be considered.

[0112] During battery operation, if the heat exchange between individual battery cells and the external environment is too rapid, the temperature of the individual battery cells is easily affected by the ambient temperature. If the battery device cannot operate at its suitable temperature, its reliability will deteriorate. For example, in low-temperature environments, individual battery cells are prone to polarization, thereby reducing their discharge capacity. Taking lithium-ion batteries as an example, at excessively low temperatures, the rate of lithium intercalation in graphite decreases, making it easier for metallic lithium to precipitate on the surface of the negative electrode. If the battery is put into use without sufficient resting time after charging, the metallic lithium cannot be completely re-intercalated into the graphite, and some metallic lithium remains on the surface of the negative electrode, posing a high risk of lithium dendrite formation. Furthermore, at excessively low temperatures, the viscosity of the electrolyte increases, and the lithium-ion migration resistance also increases, reducing the reliability of the battery device.

[0113] To improve the reliability of battery devices, insulation materials are typically added to the outer and inner surfaces of the casing. However, these insulation materials are at high risk of deformation and failure under stress, resulting in poor reliability of the battery device. Furthermore, applying insulation materials to the outside or inside of the casing may reduce the energy density of the battery device.

[0114] In view of this, this application provides a battery device, which includes a battery cell assembly and a housing. The housing includes an inner frame, an outer frame, a support plate, and connecting components. The inner frame is disposed inside the outer frame, with the outer periphery of the inner frame spaced apart from the inner periphery of the outer frame. The connecting components connect the inner frame and the outer frame. The support plate is connected to the inner frame and forms a first compartment for accommodating the battery cell assembly. The support plate supports the battery cell assembly and is spaced apart from the outer frame. The support plate and the inner frame are connected to form the first compartment for accommodating the battery cell assembly, wherein the support plate directly bears the load-bearing function of the battery cell assembly. This structure constructs a double thermal barrier by setting gaps between the outer periphery of the inner frame and the inner periphery of the outer frame, and between the support plate and the outer frame. When the heat generated by the battery cell assembly is transferred to the outside of the housing, its heat conduction path must sequentially pass through the gap area between the inner and outer frames and the gap area between the support plate and the outer frame. These two air gaps effectively block the formation of thermal bridges. This layered thermal insulation design helps to stably control the operating temperature of the battery cell assembly within the optimal operating range, improving the reliability of the battery device.

[0115] The technical solutions described in the embodiments of this application are applicable to battery cells, battery devices, and electrical devices using battery devices.

[0116] Electrical devices include, but are not limited to: electric vehicles, electric cars, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0117] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0118] For example, Figure 1 is a structural schematic diagram of a vehicle 1000 according to some embodiments of this application. The vehicle 1000 can be a fuel-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. The vehicle 1000 may have a motor 300, a controller 200, and a battery device 100 installed inside. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed 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's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0119] To meet different power demands, the battery device 100 may include multiple battery cells 12, which can be connected in series, parallel, or in a mixed configuration. The battery device 100 may also be referred to as a battery pack. Optionally, the multiple battery cells 12 can first be connected in series, parallel, or in a mixed configuration to form a battery cell assembly 101, and then the multiple battery cell assemblies 101 can be connected in series, parallel, or in a mixed configuration to form the battery device 100. That is, the multiple battery cells 12 can directly form the battery device 100, or they can first be formed into battery cell assemblies 101, and then the battery cell assemblies 101 can be formed into the battery device 100.

[0120] For example, please refer to Figure 2, which is an exploded view of a battery device 100 according to some embodiments of this application. The battery device 100 may include a plurality of battery cells 12. The battery device 100 may also include a housing 11, which has a hollow internal structure, and the plurality of battery cells 12 are housed within the housing 11. As shown in Figure 2, these are referred to here as a first housing 111 and a second housing 112, which are fastened together. The shapes of the first housing 111 and the second housing 112 can be determined according to the shape of the combination of the plurality of battery cells 12. Both the first housing 111 and the second housing 112 may have an open surface. For example, both the first housing 111 and the second housing 112 may be hollow cuboids with only one open surface each. The open surfaces of the first housing 111 and the second housing 112 are arranged opposite to each other, and the first housing 111 and the second housing 112 are fastened together to form a housing 11 with a closed cavity. Multiple battery cells 12 are connected in parallel, series, or mixed and placed inside the housing 11 formed by the first housing 111 and the second housing 112 being fastened together.

[0121] Optionally, the battery device 100 may also include other structures, which will not be described in detail here. For example, the battery device 100 may also include a busbar component for realizing electrical connection between multiple battery cells 12, such as in parallel, series, or mixed connection. Specifically, the busbar component can realize electrical connection between battery cells 12 by connecting the electrode terminals 123 of the battery cells 12. Further, the busbar component can be fixed to the electrode terminals 123 of the battery cells 12 by welding. The electrical energy of the multiple battery cells 12 can be further led out through the housing 11 via a conductive mechanism.

[0122] The number of battery cells 12 can be set to any value depending on different power requirements. Multiple battery cells 12 can be connected in series, parallel, or mixed connection to achieve a larger capacity or power. Since each battery device 100 may include a large number of battery cells 12, for ease of installation, the battery cells 12 can be grouped, with each group of battery cells 12 forming a battery cell assembly 101. The number of battery cells 12 included in a battery cell assembly 101 is unlimited and can be set according to requirements. The battery device 100 may include multiple battery cell assemblies 101, which can be connected in series, parallel, or mixed connection.

[0123] Please refer to Figure 3, which is an exploded view of a battery cell 12 according to some embodiments of this application. The battery cell 12 includes one or more electrode assemblies 122 and a housing 121. The housing 121 may include a shell 1212, and multiple walls of the shell 1212 form a cavity that can be used to accommodate the electrode assemblies 122. The shape of the shell 1212 depends on the combined shape of the one or more electrode assemblies 122. For example, the shell 1212 may be a hollow cuboid, cube, or regular polyhedron, and one face of the shell 1212 has an opening so that one or more electrode assemblies 122 can be placed inside the shell 1212. The shell 1212 is filled with an electrolyte, such as an electrolyte solution.

[0124] The battery cell 12 may also include two electrode terminals 123, which can be disposed on an end cap 1211. The end cap 1211 is typically flat, and the two electrode terminals 123 are fixed to the flat surface of the end cap 1211. The two electrode terminals 123 are respectively a positive electrode terminal 123 and a negative electrode terminal 123. Each electrode terminal 123 is provided with a corresponding adapter piece 124, which is located between the end cap 1211 and the electrode assembly 122, for electrically connecting the electrode assembly 122 and the electrode terminal 123. In this battery cell 12, depending on actual usage requirements, the electrode assembly 122 can be configured as a single unit or multiple units, and multiple independent electrode assemblies 122 are disposed within the battery cell 12.

[0125] According to some embodiments of this application, please refer to Figures 4-8. The battery device 100 includes a battery cell assembly 101 and a housing 11. The housing 11 includes an inner frame 118, an outer frame 114, a support plate 119, and a connecting member 117. The inner frame 118 is disposed inside the outer frame 114. The outer periphery of the inner frame 118 is spaced apart from the inner periphery of the outer frame 114. The connecting member 117 connects the inner frame 118 and the outer frame 114. The support plate 119 is connected to the inner frame 118 and forms a first compartment 115 for accommodating the battery cell assembly 101. The support plate 119 carries the battery cell assembly 101 and is spaced apart from the outer frame 114.

[0126] In some embodiments, the battery cell assembly 101 includes an end plate 1011 and a plurality of battery cells 12. The end plate 1011 is used to restrict the position of the plurality of battery cells 12 along a direction. For example, the plurality of battery cells 12 are arranged along a first direction X. Two end plates 1011 are provided, and the two end plates 1011 are spaced apart along the first direction X. The plurality of battery cells 12 are located between the two end plates 1011.

[0127] In some embodiments, the battery cell assembly 101 includes a plurality of battery cells 12, and the housing 11 includes two limiting members for limiting the position of the plurality of battery cells 12 along a direction. For example, the plurality of battery cells 12 are arranged along a first direction X, and the two limiting members are spaced apart along the first direction X. The plurality of battery cells 12 are located between the two limiting members, and the limiting members can be expansion beams.

[0128] The shape of the border includes, but is not limited to, polygons, circles, convex polygons, irregular polygons, etc. Of course, the shape of the border can also be a combination of multiple regular shapes.

[0129] In some embodiments, the material of the outer frame 114 may include metal, such as steel, aluminum, aluminum alloy, etc.

[0130] In some embodiments, the material of the outer frame 114 may include fiber-reinforced composite materials, etc.

[0131] In some embodiments, the outer frame 114 may be a profile outer frame.

[0132] In some embodiments, the outer frame 114 may be an outer frame formed by bending sheet metal.

[0133] In some embodiments, the outer frame 114 may be a one-piece molded frame structure. In other embodiments, the outer frame 114 may be formed by welding together multiple side beams.

[0134] In some embodiments, the inner frame 118 may include multiple beam segments, which are integrally formed. For example, referring to Figure 4, the inner frame 118 is a rectangular frame.

[0135] The shape of the inner frame 118 can be, but is not limited to, polygons, circles, convex polygons, irregular polygons, etc. Of course, the shape of the inner frame 118 can also be a combination of multiple regular shapes.

[0136] In some embodiments, the inner frame 118 may be a profile inner frame.

[0137] In some embodiments, the inner frame 118 may be an inner frame formed by bending sheet metal.

[0138] In some embodiments, the material of the support plate 119 may include metal, such as steel, aluminum, aluminum alloy, etc.

[0139] In some embodiments, the material of the support plate 119 may include fiber-reinforced composite materials, etc.

[0140] The support plate 119 supports the battery cell assembly 101, which means that the battery cell assembly 101 can be fixed to the support plate 119 and the weight of the battery cell assembly 101 can be borne by the support plate 119.

[0141] In some embodiments, the support plate 119 may be connected to the inner frame 118 by means of fasteners or welding.

[0142] In some embodiments, the connecting component 117 can connect the inner frame 118 and the outer frame 114 via fasteners.

[0143] In some embodiments, the connecting component 117 may be welded to the inner frame 118 and the outer frame 114.

[0144] The connecting component 117 can connect the inner frame 118 and the outer frame 114 directly or indirectly. For example, in some embodiments, the connecting component 117 can connect the inner frame 118 and the base plate 113, and the base plate 113 is connected to the outer frame 114, that is, the connecting component 117 is indirectly connected to the outer frame 114.

[0145] The outer periphery of the inner frame 118 is spaced apart from the inner periphery of the outer frame 114. This means that the air layer in the gap between the outer periphery of the inner frame 118 and the inner periphery of the outer frame 114 provides insulation and prevents the formation of thermal bridges. Similarly, the spaced-apart support plate 119 and outer frame 114 also provide insulation, preventing the formation of thermal bridges. In other words, the presence of these gaps reduces the rate of heat exchange between the battery cell assembly 101 and the external environment. This improves the thermal insulation performance of the battery device 100 and reduces the likelihood that the temperature of the battery cell assembly 101 will be excessively affected by ambient temperature.

[0146] By spacing the outer periphery of the inner frame 118 from the inner periphery of the outer frame 114, and spacing the support plate 119 from the outer frame 114, the thermal insulation performance of the battery device 100 can be passively improved. In some embodiments, under the premise of meeting the battery swapping requirements, the same accommodating space may accommodate different numbers of battery cells 12, and the battery device 100 may have some idle space. By forming an insulation layer in the idle space, the thermal insulation performance of the battery device 100 can be improved without adding too much insulation material.

[0147] In the technical solution of this application embodiment, the support plate 119 is connected to the inner frame 118, together forming a first compartment 115 for accommodating the battery cell assembly 101, wherein the support plate 119 directly bears the load-bearing function of the battery cell assembly 101. This structure constructs a double thermal insulation barrier by setting gaps between the outer periphery of the inner frame 118 and the inner periphery of the outer frame 114, and between the support plate 119 and the outer frame 114. When the heat generated by the battery cell assembly 101 is transferred to the outside of the housing 11, its heat conduction path must sequentially pass through the gap area between the inner frame 118 and the outer frame 114 and the gap area between the support plate 119 and the outer frame 114. These two air gaps effectively block the formation of thermal bridges. This layered thermal insulation design helps to stably control the operating temperature of the battery cell assembly 101 within the optimal operating range, improving the reliability of the battery device 100.

[0148] According to some embodiments of this application, please refer to Figures 4-8. The support plate 119 has a flow channel 1191 formed inside for accommodating the heat exchange medium.

[0149] In some embodiments, the base plate 113 is a profile base plate 113, and the cavity of the profile forms a flow channel 1191.

[0150] In some embodiments, the base plate 113 includes a first plate and a second plate stacked together, one of the first plate and the second plate having a groove, and the other of the first plate and the groove defining a flow channel 1191.

[0151] The heat exchange medium can be a liquid, a gas, or a mixture of gas and liquid.

[0152] The heat exchange medium is used to regulate the temperature of the battery cell 12.

[0153] In the above scheme, the support plate 119 serves both structural support and thermal management functions in the battery device 100, making the layout of the battery device 100 more compact and thus improving the overall energy density. In addition, the gap between the support plate 119 and the outer frame 114 forms an air gap, which can effectively reduce the interference of the external ambient temperature of the housing 11 on the heat exchange medium, so that the heat exchange medium has a higher heat exchange efficiency.

[0154] According to some embodiments of this application, please refer to Figures 4-8. In the same projection plane perpendicular to the thickness direction Z of the support plate, the outer edge of the orthographic projection of the support plate 119 and the inner edge of the orthographic projection of the outer frame 114 are spaced apart.

[0155] In some embodiments, the orthographic projection of the support plate 119 lies within the orthographic projection of the inner frame 118 in the same projection plane perpendicular to the thickness direction Z of the support plate.

[0156] In some embodiments, the orthographic projection of the inner frame 118 lies within the orthographic projection of the support plate 119 in the same projection plane perpendicular to the thickness direction Z of the support plate.

[0157] In the above solution, by setting the thickness direction Z of the support plate as the assembly positioning reference, the assembly accuracy of the support plate 119 and the outer frame 114 can be improved, thereby enabling precise control of the gap between the two, which is beneficial to the heat conduction efficiency of the battery device 100. Furthermore, this design also facilitates the automated production of the battery device 100.

[0158] According to some embodiments of this application, please refer to Figures 4-8. The inner frame 118 includes two first internal beams 1181 and two second internal beams 1182. The two first internal beams 1181 are spaced apart along a first direction X, and the two second internal beams 1182 are spaced apart along a second direction Y. The first internal beams 1181 connect the two second internal beams 1182. The second direction Y, the first direction X, and the thickness direction Z of the support plate are perpendicular to each other.

[0159] In some embodiments, the first internal beam 1181 may include multiple segments, which are spaced apart along the second direction Y.

[0160] In some embodiments, the second internal beam 1182 may include multiple segments, which are spaced apart along a first direction X.

[0161] In some embodiments, the first internal beam 1181 and the second internal beam 1182 are inserted into each other along the thickness direction Z of the support plate.

[0162] In the above scheme, the first internal beam 1181 and the second internal beam 1182 can serve as assembly references for each other, thereby reducing the assembly difficulty of the box body 11. At the same time, the first internal beam 1181 connects the two second internal beams 1182, which can improve the structural stability of the inner frame 118.

[0163] According to some embodiments of this application, referring to Figures 4-8, the outer frame 114 includes two first side beams 11411 and two second side beams 11412. The two first side beams 11411 are spaced apart along a first direction X, and the two second side beams 11412 are spaced apart along a second direction Y. Along the first direction X, a first internal beam 1181 is spaced apart from the first side beams 11411; along the second direction Y, a second internal beam 1182 is spaced apart from the second side beams 11412.

[0164] Along the first direction X, the first internal beam 1181 and the first side beam 11411 are spaced apart, which means that there is a gap between the first internal beam 1181 and the first side beam 11411. In other words, an air layer is formed between the first internal beam 1181 and the first side beam 11411.

[0165] Along the second direction Y, the second internal beam 1182 and the second side beam 11412 are spaced apart, which means that there is a gap between the second internal beam 1182 and the second side beam 11412. In other words, an air layer is formed between the second internal beam 1182 and the second side beam 11412.

[0166] In the above scheme, the gap between the first internal beam 1181 and the first side beam 11411, and the gap between the second internal beam 1182 and the second side beam 11412, effectively block the formation of thermal bridges, which helps to stabilize the operating temperature of the battery cell assembly 101 within the optimal operating range and improves the reliability of the battery device 100.

[0167] According to some embodiments of this application, referring to Figures 5 and 8-11, the battery cell assembly 101 includes a plurality of battery cells 12 stacked along a first direction X. The battery device 100 also includes a heat insulation pad 120 disposed at at least one end of the battery cell assembly 101 along the first direction X.

[0168] The plurality of battery cells 12 includes at least one group of battery cells 12, and each group of battery cells 12 includes a plurality of battery cells 12 stacked along a first direction X. In an embodiment where the battery cell assembly 101 includes two end plates 1011, two groups of battery cells 12 may be included between the two end plates 1011 along the first direction X, and the two groups of battery cells 12 are arranged along a second direction Y, sharing the two end plates 1011. Of course, only one group of battery cells 12 may be included between the two end plates 1011.

[0169] The materials of the heat insulation pad 120 include, but are not limited to, polyethylene film, polyimide film, silicone rubber, fiberglass cloth, aerogel, ceramic fiber, foam, mica, fiber reinforced composite materials, etc.

[0170] In some embodiments, the battery cell assembly 101 includes an end plate 1011 and a plurality of battery cells 12. Two end plates 1011 are provided, and the two end plates 1011 are spaced apart along a first direction X. The plurality of battery cells 12 are located between the two end plates 1011. Along the first direction X, a heat insulation pad 120 is provided on the side of the end plate 1011 away from the battery cells 12.

[0171] In some embodiments, the inner frame 118 includes two first internal beams 1181 and two second internal beams 1182. The two first internal beams 1181 are spaced apart along a first direction X, and the two second internal beams 1182 are spaced apart along a second direction Y. The two ends of the first internal beams 1181 are respectively connected to the two second internal beams 1182, and the two ends of the second internal beams 1182 are respectively connected to the two first side beams 11411. Multiple heat insulation pads 120 are provided, with at least one heat insulation pad 120 disposed between the battery cell assembly 101 and the first internal beams 1181 along the first direction X.

[0172] In some embodiments, the housing 11 further includes partition beams 125, which divide the first compartment 115 into multiple first sub-compartments 1151. Multiple battery cell assemblies 101 are provided, each corresponding to one of the multiple first sub-compartments 1151, with each battery cell assembly 101 disposed in its corresponding first sub-compartment 1151. Multiple partition beams 125 are provided, each including a first sub-partition beam 1251 and a second sub-partition beam 1252. The first sub-partition beam 1251 extends along a second direction Y, and the second sub-partition beam 1252 extends along a first direction X. The second direction Y, the first direction X, and the thickness direction Z of the support plate are perpendicular to each other. Multiple heat insulation pads 120 are provided, with at least one heat insulation pad 120 disposed between the battery cell assembly 101 and the first sub-partition beam 1251 along the first direction X.

[0173] In the above scheme, the heat insulation pad 120 can reduce the heat loss of the battery cell assembly 101 in the path from the heat of the battery cell assembly 101 to the outside of the housing 11 in the first direction X, and further improve the heat preservation performance of the battery device 100.

[0174] According to some embodiments of this application, please refer to Figures 5 and 8-11. The heat insulation pad 120 has a cavity 1201 inside.

[0175] In some embodiments, the cavity 1201 can be formed in one step during the molding process of the heat insulation pad 120, for example, by injection molding.

[0176] In some embodiments, the cavity 1201 can be formed by secondary processing after the heat insulation pad 120 is formed, for example, by machining.

[0177] In the above scheme, the air layer inside the cavity 1201 can further improve the heat insulation performance of the heat insulation pad 120, thereby further improving the heat preservation performance of the battery device 100.

[0178] According to some embodiments of this application, please refer to Figures 5 and 8-11, the thermal conductivity of the heat insulation pad 120 is less than that of the inner frame 118.

[0179] The thermal conductivity of the heat insulation pad 120 is less than that of the inner frame 118, which means that the heat transfer rate inside the heat insulation pad 120 is lower than the heat transfer rate inside the inner frame 118.

[0180] In the above solution, since the thermal conductivity of the heat insulation pad 120 is less than that of the inner frame 118, the difficulty of heat exchange between the battery cell assembly 101 and the inner frame 118 is increased. In turn, the risk of excessive heat loss from the battery cell assembly 101 to the outside of the housing 11 through the inner frame 118 and the frame is further reduced, and the heat preservation performance of the battery device 100 is improved.

[0181] According to some embodiments of this application, please refer to Figures 5 and 8-11. The material of the heat insulation pad 120 includes fiber-reinforced composite material, and the material of the inner frame 118 includes metal.

[0182] The materials used for the heat insulation pad 120 include, but are not limited to, fiber-reinforced concrete.

[0183] The inner frame 118 is made of materials including but not limited to steel, aluminum, and aluminum alloy.

[0184] In the above solution, while improving the thermal insulation performance of the battery device 100, the heat insulation pad 120, which includes fiber-reinforced composite material, and the inner frame 118, which includes metal, can improve the structural strength of the housing 11.

[0185] According to some embodiments of this application, please refer to Figures 5-8. The housing 11 also includes a partition beam 125, which divides the first compartment 115 into a plurality of first sub-compartments 1151. A plurality of battery cell assemblies 101 are provided, and the plurality of battery cell assemblies 101 correspond one-to-one with the plurality of first sub-compartments 1151. Each battery cell assembly 101 is located in its corresponding first sub-compartment 1151.

[0186] In some embodiments, the partition beam 125 may include multiple partition beam segments 125, which are integrally formed.

[0187] The shape of the partition beam 125 may include, but is not limited to, polygons, circles, convex polygons, irregular polygons, etc.

[0188] In some embodiments, the partition beam 125 may be a profile partition beam.

[0189] In some embodiments, the partition beam 125 may be a partition beam formed by bending a sheet metal part.

[0190] In the above scheme, the first sub-compartment 1151 can serve as the assembly reference for its corresponding battery cell assembly 101, which helps to reduce the assembly difficulty of the battery device 100 and improve the assembly efficiency of the battery device 100.

[0191] According to some embodiments of this application, please refer to Figures 5-8. Multiple partition beams 125 are provided. The multiple partition beams 125 include a first sub-partition beam 1251 and a second sub-partition beam 1252. The first sub-partition beam 1251 extends along the second direction Y, and the second sub-partition beam 1252 extends along the first direction X. The second direction Y, the first direction X and the thickness direction Z of the support plate are perpendicular to each other.

[0192] The first sub-separation beam 1251 extends along the second direction Y, which means that in the same projection plane perpendicular to the thickness direction of the first sub-separation beam 1251, the length direction of the orthographic projection of the first sub-separation beam 1251 is the second direction Y.

[0193] The second sub-separation beam 1252 extends along the first direction X, which means that in the same projection plane perpendicular to the thickness direction of the second sub-separation beam 1252, the length direction of the orthographic projection of the second sub-separation beam 1252 is the first direction X.

[0194] In the above scheme, the extension direction of the first sub-dividing beam 1251, the extension direction of the second sub-dividing beam 1252, and the thickness direction Z of the support plate are perpendicular to each other, which can simplify the assembly difficulty of multiple sub-dividing beams 125.

[0195] According to some embodiments of this application, please refer to Figures 5-8. Multiple connecting parts 117 are provided, and the multiple connecting parts 117 are spaced apart along the circumferential direction of the inner frame 118.

[0196] Multiple connecting parts 117 are spaced apart along the circumference of the inner frame 118, which means that when the box 11 is subjected to external force, multiple areas in the circumference of the inner frame 118 can disperse the external force through the connecting parts 117, so that the inner frame 118 has higher structural stability.

[0197] In the above solution, multiple connecting parts 117 can improve the connection stability of the inner frame 118. In addition, since multiple connecting parts 117 are arranged at intervals along the circumference of the inner frame 118, external forces can be more effectively dispersed, the risk of local stress concentration can be reduced, and the reliability of the housing 11 can be improved.

[0198] According to some embodiments of this application, please refer to Figures 5-8. Multiple connecting parts 117 are provided. The multiple connecting parts 117 include a first connecting part 1171, which is integrally formed with the inner frame 118; and / or, the multiple connecting parts 117 include a second connecting part 1172, which is integrally formed with the inner frame 118.

[0199] In some embodiments, the first connecting component 1171 is integrally formed with the first internal beam 1181, and the second connecting component 1172 is integrally formed with the second internal beam 1182. The first connecting component 1171 and the first internal beam 1181 can be formed together from a single beam body, and the second connecting component 1172 and the second internal beam 1182 can be formed together from a single beam body. Taking the first connecting component 1171 and the first internal beam 1181 as an example, after the beam body is machined, a notch can be made on the beam body to separate the beam body into the first connecting component 1171 and the first internal beam 1181. The notch is used for insertion and mating with the beam body where the second internal beam 1182 is located.

[0200] In some embodiments, the first connecting component 1171 and the inner frame 118 can be integrally formed by an extrusion process.

[0201] In some embodiments, the first connecting component 1171 and the inner frame 118 can be integrally formed by sheet metal bending process.

[0202] Compared to connections between the connecting component 117 and the inner frame 118 formed by welding or fasteners, the risk of weld failure or fastener torque failure between the integrally molded connecting component 117 and the inner frame 118 is lower. The risk of connection failure due to weak areas existing between the connecting component 117 and the inner frame 118 is also lower.

[0203] In the above solution, the connecting component 117 and the inner frame 118 are processed by integral molding, which can simplify the assembly process of the battery device 100 and reduce the risk of connection failure due to weak areas between the connecting component 117 and the inner frame 118.

[0204] According to some embodiments of this application, please refer to Figures 5-8. Multiple connecting parts 117 are provided, and the multiple connecting parts 117 include a third connecting part 1173. The third connecting part 1173 is separately formed from the inner frame 118.

[0205] In some embodiments, the first connecting member 1171 is integrally formed with the first internal beam 1181; and / or, the second connecting member 1172 is integrally formed with the second internal beam 1182. The separately formed third connecting member 1173 can further improve the connection stability between the inner frame 118 and the outer frame 114. Moreover, the arrangement of the third connecting member 1173 is more flexible.

[0206] In the above solution, the third connecting component 1173 and the inner frame 118 are separately formed, which improves the connection stability of the inner frame 118, while also enabling the battery device 100 to have a lower cost and improving the ease of maintenance of the housing 11.

[0207] According to some embodiments of this application, please refer to Figures 5-8. The housing 11 also includes a bottom plate 113, which is connected to the outer frame 114. Along the thickness direction Z of the support plate, the bottom plate 113 is located on the side of the support plate 119 away from the battery cell assembly 101.

[0208] In some embodiments, the thermal conductivity of the support plate 119 is lower than that of the base plate 113.

[0209] In some embodiments, the support plate 119 contacts the base plate 113.

[0210] In some embodiments, a cavity is formed inside the base plate 113, and the presence of the cavity can improve the thermal insulation performance of the base plate 113.

[0211] In some embodiments, the base plate 113 may be made of metal, such as steel, aluminum, aluminum alloy, etc.

[0212] In some embodiments, the material of the base plate 113 may include fiber-reinforced composite materials, etc.

[0213] In some embodiments, the outer frame 114 may be connected to the base plate 113 by a plurality of fasteners.

[0214] The outer frame 114 and the base plate 113 can be connected by welding or fasteners. Of course, in some embodiments, the outer frame 114 and the base plate 113 can be integrally formed, for example by casting, machining, 3D printing, etc.

[0215] In the above scheme, the spaced arrangement between the support plate 119 and the outer frame 114 improves the heat preservation performance of the battery device 100, while the arrangement of the bottom plate 113 can reduce the risk of foreign objects entering the box 11 and damaging the battery cells 12, thereby improving the reliability of the battery device 100.

[0216] According to some embodiments of this application, please refer to Figures 5-8. Along the thickness direction Z of the support plate, the support plate 119 and the base plate 113 are spaced apart.

[0217] Along the thickness direction of the base plate 113, the support plate 119 is spaced apart from the base plate 113, which means that there are gap areas in the path through which the heat of the battery cell assembly 101 is transferred to the outside of the housing 11 via the support plate 119 and the base plate 113.

[0218] In some embodiments, the support plate 119 and the base plate 113 are spaced apart along the thickness direction Z of the support plate. This can be understood as the support plate 119 and the base plate 113 having areas that do not contact each other along the thickness direction Z of the support plate.

[0219] In the above scheme, since the support plate 119 and the base plate 113 are spaced apart along the thickness direction Z of the support plate, there is a gap between the support plate 119 and the base plate 113. When the heat generated by the battery cell assembly 101 is transferred to the outside of the housing 11, its heat conduction path must pass through the gap area between the support plate 119 and the base plate 113 in sequence. The air gap effectively blocks the formation of thermal bridges, which can further improve the heat preservation performance of the battery device 100 and improve the reliability of the battery device 100.

[0220] According to some embodiments of this application, please refer to Figures 5-8, a heat insulation material is provided between the support plate 119 and the base plate 113.

[0221] Thermal insulation materials include, but are not limited to, polyethylene film, polyimide film, silicone rubber, fiberglass cloth, aerogel, ceramic fiber, foam materials, mica materials, etc.

[0222] In the above scheme, the addition of heat insulation material can increase the difficulty of heat exchange between the support plate 119 and the base plate 113, thereby further improving the heat preservation performance of the battery device 100.

[0223] According to some embodiments of this application, please refer to Figures 5-8 and Figure 12. The outer frame 114 includes a first outer frame 1141 and a second outer frame 1142. An inner frame 118 is disposed inside the first outer frame 1141, and the outer periphery of the inner frame 118 is spaced apart from the inner periphery of the first outer frame 1141. The second outer frame 1142 is disposed outside the first outer frame 1141, and the second outer frame 1142 is connected to the first outer frame 1141 and surrounds the bottom plate 113 to form a second compartment 116. The battery device 100 also includes an electronic control module 126, which is disposed in the second compartment 116.

[0224] In some embodiments, the control module 126 is housed in a single enclosure, for example, a high-voltage box is provided on the base plate 113, and the control module 126 is disposed inside the high-voltage box.

[0225] In some embodiments, the electronic control module 126 may include, but is not limited to, components such as sensors, fuses, and relays. In other embodiments, the various parts of the electronic control module 126 may be directly arranged in the second compartment 116. For example, components such as sensors, fuses, and relays may be distributed and assembled on the base plate 113 in the second compartment 116 or on the mounting bracket in the second compartment 116.

[0226] The outer periphery of the inner frame 118 is spaced apart from the inner periphery of the first outer frame 1141, meaning that the thermal bridge between the battery cell assembly 101 and the electronic control module 126 is interrupted by an air layer in the heat transfer path. This facilitates more precise temperature control between the first compartment 115 and the second compartment 116, ensuring that both the electronic control module 126 and the battery cell assembly 101 operate within a suitable temperature range.

[0227] In the above scheme, since the outer periphery of the inner frame 118 is spaced apart from the inner periphery of the first outer frame 1141, there is a gap between the inner frame 118 and the first outer frame 1141. When the heat generated by the battery cell assembly 101 is transferred to the second compartment 116, its heat conduction path must pass through the gap area between the inner frame 118 and the first outer frame 1141 in sequence. The air gap effectively blocks the formation of thermal bridges, which can improve the reliability of the electronic control module 126.

[0228] According to some embodiments of this application, please refer to Figures 5-8 and Figure 12. The first compartment 115 and the second compartment 116 are spaced apart along the first direction X. The battery device 100 also includes a battery management unit 127, which is disposed between the first compartment 115 and the second compartment 116 along the first direction X.

[0229] In some embodiments, please refer to FIG5, the outer frame 114 includes two first side beams 11411 and two second side beams 11412. The two first side beams 11411 are spaced apart along a first direction X, and the two second side beams 11412 are spaced apart along a second direction Y. The second direction Y, the first direction X and the thickness direction Z of the support plate are perpendicular to each other. The outer frame 114 also includes two third side beams 11421 and a fourth side beam 11422. The two third side beams 11421 are spaced apart along the second direction Y. The fourth side beam 11422 extends along the second direction Y. The two ends of the fourth side beam 11422 are respectively connected to the first ends of the two third side beams 11421. The second end of the third side beam 11421 is connected to one of the first side beams 11411. Along the first direction X, the first side beam 11411 connected to the third side beam 11421 is located between the fourth side beam 11422 and the other third side beam 11421. The two third side beams 11421, the fourth side beam 11422, the first side beam 11411 connected to the third side beam 11421, and the bottom plate 113 together define the second compartment 116. In some embodiments, referring to FIG12, the first side beam 11411 connected to the third side beam 11421 is provided with a through-hole 1145 extending along the first direction X, through which a wire harness can pass. Referring to FIG6, in some other embodiments, along the first direction X, the battery management unit 127 is located between the first side beam 11411 connected to the third side beam 11421 and a first internal beam 1181 adjacent to the first side beam 11411.

[0230] In some embodiments, the battery management unit 127 is used to manage the battery cell 12. For example, the battery management unit 127 can detect parameters such as voltage, current, and temperature of the battery cell 12, adjust the charging and discharging state of the battery cell 12, integrate functions such as overvoltage protection, overcurrent protection, short circuit protection, and temperature protection, record historical data of the battery cell 12, such as the number of charging cycles and temperature curves, and communicate with the power-consuming device.

[0231] In the above scheme, the gap between the first compartment 115 and the second compartment 116 not only improves the heat preservation performance of the battery device 100, but also accommodates the battery management unit 127, making the structure of the battery device 100 more compact and conducive to improving the energy density of the battery device 100.

[0232] According to some embodiments of this application, please refer to FIG1, this application provides an electrical device that includes a battery device 100 as described in one or more of the above embodiments, the battery device 100 being used to provide electrical energy.

[0233] In the above solutions, since the battery device 100 in one or more of the above embodiments has high reliability, the power-consuming device including the battery device 100 in one or more of the above embodiments also has high reliability.

[0234] According to some embodiments of this application, referring to Figures 5-12, this application provides a battery device 100 including a battery cell assembly 101 and a housing 11. The housing 11 includes a base plate 113, a support plate 119, an outer frame 114, an inner frame 118, and a connecting component 117. The outer frame 114 is connected to the base plate 113 and encloses the base plate 113 to form an accommodating space. Along the thickness direction Z of the support plate, the base plate 113 is located on the side of the support plate 119 opposite to the battery cell assembly 101. The accommodating space has an opening, and the housing 11 also includes a cover. Along the thickness direction of the base plate 113, the cover is disposed opposite to the base plate 113, and the cover closes the opening. The accommodating space includes a first compartment 115 and a second compartment 116. A support plate 119 is connected to an inner frame 118 to form the first compartment 115. The outer frame 114 includes a first outer frame 1141 and a second outer frame 1142. The inner frame 118 is disposed within the first outer frame 1141, and the outer periphery of the inner frame 118 is spaced apart from the inner periphery of the first outer frame 1141. The second outer frame 1142 is disposed outside the first outer frame 1141, and is connected to the first outer frame 1141 and encloses the bottom plate 113 to form the second compartment 116. The electronic control module 126 of the battery device 100 is disposed in the second compartment 116, and the battery cell assembly 101 is disposed in the first compartment 115. The first compartment 115 and the second compartment 116 are spaced apart along a first direction X. Along the first direction X, the battery management unit 127 of the battery device 100 is disposed between the first compartment 115 and the second compartment 116.

[0235] The support plate 119 supports the battery cell assembly 101, and its interior has flow channels 1191 for accommodating the heat exchange medium. A connecting component 117 connects the inner frame 118 and the outer frame 114. The outer periphery of the inner frame 118 is spaced apart from the inner periphery of the outer frame 114, and the support plate 119 is spaced apart from the outer frame 114. The support plate is in the thickness direction Z, and it is spaced apart from the base plate 113.

[0236] The inner frame 118 includes two first internal beams 1181 and two second internal beams 1182. The two first internal beams 1181 are spaced apart along a first direction X, and the two second internal beams 1182 are spaced apart along a second direction Y. The first internal beams 1181 connect the two second internal beams 1182. The second direction Y, the first direction X, and the thickness direction Z of the support plate are all perpendicular to each other. The outer frame 114 includes two first side beams 11411 and two second side beams 11412. The two first side beams 11411 are spaced apart along the first direction X, and the two second side beams 11412 are spaced apart along the second direction Y. Along the first direction X, the first internal beams 1181 and the first side beams 11411 are spaced apart; along the second direction Y, the second internal beams 1182 and the second side beams 11412 are spaced apart. The housing 11 also includes partition beams 125, which divide the first compartment 115 into multiple first sub-compartments 1151. Multiple battery cell assemblies 101 are provided, each corresponding to one of the multiple first sub-compartments 1151. The partition beams 125 include first sub-partition beams 1251 and second sub-partition beams 1252. The first sub-partition beam 1251 extends along a second direction Y, and the second sub-partition beam 1252 extends along a first direction X. The second direction Y, the first direction X, and the thickness direction Z of the support plate are all perpendicular to each other.

[0237] Multiple connecting components 117 are provided, and the multiple connecting components 117 are spaced apart circumferentially along the inner frame 118. The multiple connecting components 117 include a first connecting component 1171, a second connecting component 1172, and a third connecting component 1173. The first connecting component 1171 is integrally formed with the first internal beam 1181, the second connecting component 1172 is integrally formed with the second internal beam 1182, and the third connecting component 1173 is separately formed from the inner frame 118.

[0238] The battery cell assembly 101 includes a plurality of battery cells 12 stacked along a first direction X. A heat insulation pad 120 is disposed at at least one end of the battery cell assembly 101 along the first direction X. A cavity 1201 is provided inside the heat insulation pad 120.

[0239] 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 in that, include: Battery cell assembly; The housing includes an inner frame, an outer frame, a support plate, and connecting components. The inner frame is disposed inside the outer frame, and the outer periphery of the inner frame is spaced apart from the inner periphery of the outer frame. The connecting components connect the inner frame and the outer frame. The support plate is connected to the inner frame and forms a first compartment for accommodating the battery cell assembly. The support plate carries the battery cell assembly and is spaced apart from the outer frame.

2. The battery device according to claim 1, characterized in that, The support plate has internal channels for containing the heat exchange medium.

3. The battery device according to claim 1 or 2, characterized in that, In the same projection plane perpendicular to the thickness direction of the support plate, the outer edge of the orthographic projection of the support plate is spaced apart from the inner edge of the orthographic projection of the outer frame.

4. The battery device according to any one of claims 1-3, characterized in that, The inner frame includes two first internal beams and two second internal beams. The two first internal beams are spaced apart along a first direction, and the two second internal beams are spaced apart along a second direction. The first internal beams connect the two second internal beams. The second direction, the first direction, and the thickness direction of the support plate are perpendicular to each other.

5. The battery device according to claim 4, characterized in that, The outer frame includes two first side beams and two second side beams, the two first side beams being spaced apart along a first direction, and the two second side beams being spaced apart along a second direction; Along the first direction, the first internal beam and the first side beam are spaced apart; along the second direction, the second internal beam and the second side beam are spaced apart.

6. The battery device according to any one of claims 1-5, characterized in that, The battery cell assembly includes a plurality of battery cells stacked along a first direction; The battery device further includes a heat insulation pad disposed at at least one end of the battery cell assembly along the first direction.

7. The battery device according to claim 6, characterized in that, The heat insulation pad has a cavity inside.

8. The battery device according to claim 6 or 7, characterized in that, The thermal conductivity of the insulation pad is less than that of the inner frame.

9. The battery device according to claim 8, characterized in that, The heat insulation pad is made of fiber-reinforced composite material, and the inner frame is made of metal.

10. The battery device according to any one of claims 1-9, characterized in that, The enclosure also includes a partition beam that divides the first compartment into multiple first sub-compartments. Multiple battery cell assemblies are provided, and each battery cell assembly corresponds to one of the multiple first sub-compartments. Each battery cell assembly is located in its corresponding first sub-compartment.

11. The battery device according to claim 10, characterized in that, The partition beams are provided in multiple ways, including a first sub-partition beam and a second sub-partition beam. The first sub-partition beam extends along a second direction, and the second sub-partition beam extends along a first direction. The second direction, the first direction, and the thickness direction of the support plate are perpendicular to each other.

12. The battery device according to any one of claims 1-11, characterized in that, The connecting components are provided in multiple ways, and the multiple connecting components are arranged at intervals along the circumference of the inner frame.

13. The battery device according to claim 12, characterized in that, The connecting components are provided in multiple ways, including a first connecting component that is integrally formed with the inner frame; and / or, the connecting components include a second connecting component that is integrally formed with the inner frame.

14. The battery device according to claim 12 or 13, characterized in that, The connecting components are provided in multiple ways, including a third connecting component, which is separately formed from the inner frame.

15. The battery device according to any one of claims 1-14, characterized in that, The housing also includes a bottom plate, which is connected to the outer frame and is located on the side of the support plate away from the battery cell assembly along the thickness direction of the support plate.

16. The battery device according to claim 15, characterized in that, Along the thickness direction of the support plate, the support plate and the base plate are spaced apart.

17. The battery device according to claim 15 or 16, characterized in that, A heat insulation material is provided between the support plate and the base plate.

18. The battery device according to any one of claims 1-17, characterized in that, The outer frame includes: A first outer frame, wherein the inner frame is disposed within the first outer frame, and the outer periphery of the inner frame is spaced apart from the inner periphery of the first outer frame; The second outer frame is disposed outside the first outer frame, and the second outer frame is connected to the first outer frame and encloses the bottom plate to form a second compartment; The battery device further includes an electronic control module, which is located in the second compartment.

19. The battery device according to claim 18, characterized in that, The first compartment and the second compartment are spaced apart along a first direction. The battery device further includes a battery management unit disposed between the first compartment and the second compartment along the first direction.

20. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-19, the battery device being used to provide electrical energy.

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