Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, and belongs to the technical field of batteries. The battery device comprises a battery monomer assembly and a box body assembly, a containing cavity is formed in the box body assembly, and the battery monomer assembly is arranged in the containing cavity. Wherein the volume energy density of the battery device is larger than or equal to 50 Wh / L and smaller than or equal to 1000 Wh / L, and the volume energy density of the battery device is the ratio of the total energy of the battery monomer assembly to the volume of the box body assembly; the box body assembly comprises a first beam body and a second beam body, and the density of the first beam body is smaller than that of the second beam body. The battery device has relatively high reliability.

Description

Technical Field

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

[0002] 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 compatibility between battery devices and electrical devices is a pressing issue in battery technology. Utility Model Content

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

[0005] In a first aspect, this application provides a battery device, which includes a battery cell assembly and a housing assembly. The housing assembly has a receiving cavity, and the battery cell assembly is disposed within the receiving cavity. The volumetric energy density of the battery device is greater than or equal to 50 Wh / L and less than or equal to 1000 Wh / L, and the volumetric energy density of the battery device is the ratio of the total energy of the battery cell assembly to the volume of the housing assembly. The housing assembly includes a first beam and a second beam, and the density of the first beam is less than the density of the second beam.

[0006] In the technical solution of this application embodiment, when the volume of the housing assembly is constant, by simultaneously arranging first beams and second beams with different densities within the housing assembly, it is easier to match the total weight of battery devices with different volumetric energy densities to the weight requirements of the power-consuming device when there is a large fluctuation range in the volumetric energy density of the battery device (the volumetric energy density of the battery device is greater than or equal to 50Wh / L and less than or equal to 1000Wh / L), thereby improving the compatibility between the battery device and the power-consuming device.

[0007] In one or more embodiments of the first aspect, the material of the first beam includes one of aluminum and magnesium alloy, and the material of the second beam includes one of steel and cast iron.

[0008] In the above scheme, the first beam is made of either aluminum or magnesium alloy, which allows it to be lightweight while possessing high corrosion resistance. The second beam is made of either steel or cast iron, which allows it to be heavier while possessing high structural strength and low cost. By simultaneously arranging the first beam, made of aluminum and magnesium alloy, and the second beam, made of steel and cast iron, within the housing assembly, the battery device can be more easily matched to the power supply device's requirements for weight, corrosion resistance, structural strength, and cost, thus improving the compatibility between the battery device and the power supply device. At the same time, the battery device can achieve a balance between high corrosion resistance, high structural strength, and low cost.

[0009] In one or more embodiments of the first aspect, the first beam is a profile beam and the second beam is a sheet metal beam.

[0010] In the above scheme, the first beam is a profile beam, which gives it high cross-sectional stiffness and thus high structural strength. It also provides high flatness, resulting in high assembly precision. The second beam is a sheet metal beam, which offers high processing efficiency, low cost, and more flexible cross-sectional shapes. By simultaneously arranging profile beams and sheet metal beams within the housing assembly, the battery device can more easily match the requirements of the power supply device regarding structural strength, assembly precision, processing efficiency, cross-sectional shape, and cost, improving the compatibility between the battery device and the power supply device. Furthermore, the beams of the battery device can balance high structural strength, high assembly precision, high processing efficiency, and low cost.

[0011] In one or more embodiments of the first aspect, the first beam has at least one first cavity, and the first cavity is provided with a filling material.

[0012] In the above scheme, arranging the filling material inside the first cavity increases the weight of the battery device, making it easier to match the total weight of battery devices with different volumetric energy densities to the weight requirements of the power supply device, thus improving the compatibility between the battery device and the power supply device. At the same time, utilizing the inherent internal space of the first beam to arrange the filling material helps to enable the battery device to have a higher volumetric energy density.

[0013] In one or more embodiments of the first aspect, the filler material is one of ductile iron, marble, and concrete.

[0014] In one or more embodiments of the first aspect, the housing assembly includes an outer frame, the outer frame including a plurality of side beams connected end to end, at least one side beam being a first beam.

[0015] In the above scheme, since the outer frame has high sealing performance requirements, that is, higher flatness requirements, setting at least one side beam of the outer frame as a profile beam is beneficial to enable the outer frame to have high flatness, thereby having high assembly accuracy, reducing the risk of battery device sealing failure, and improving the reliability of the battery device.

[0016] In one or more embodiments of the first aspect, each side beam is a first beam body.

[0017] In the above scheme, since each side beam is the first beam body, the assembly accuracy of the outer frame can be further improved, the risk of battery device sealing failure can be further reduced, and the reliability of the battery device can be further improved.

[0018] In one or more embodiments of the first aspect, the housing assembly further includes at least one first partition beam located within the space enclosed by the outer frame, and the at least one first partition beam is a second beam.

[0019] In the above solution, by setting at least one first partition beam as a sheet metal beam, the cross-sectional shape parameters of the first partition beam can be flexibly optimized according to the beam layout and battery cell distribution characteristics within the battery device's internal space. This allows for high space utilization of the battery cells while maintaining high structural strength in the housing assembly, thereby effectively improving the overall energy density of the battery device.

[0020] In one or more embodiments of the first aspect, the housing assembly further includes a first partition beam, an outer frame, and a support plate. The first partition beam is disposed within the outer frame, and the outer peripheral side of the first partition beam is spaced apart from the inner peripheral side of the outer frame. The support plate is connected to the first partition beam to form a first compartment for accommodating battery cells, and the support plate carries the battery cells.

[0021] In the above scheme, since no battery cells are placed between the first partition beam and the outer frame, the weight of the battery device may deviate from the weight requirements of the power-consuming device. When the volume of the housing assembly is fixed, by simultaneously arranging the first beam and the second beam with different densities within the housing assembly, it is easier to match the total weight of the battery device with the weight requirements of the power-consuming device, thereby improving the compatibility between the battery device and the power-consuming device.

[0022] In one or more embodiments of the first aspect, the support plate and the outer frame are spaced apart.

[0023] In the above scheme, with a fixed volume of the housing assembly, the relatively small size of the support plate, due to the spacing between the support plate and the outer frame, may cause the weight of the battery device to deviate from the weight requirements of the power-consuming device. By simultaneously arranging a first beam and a second beam with different densities within the housing, it is easier to match the total weight of the battery device with the weight requirements of the power-consuming device, improving the compatibility between the battery device and the power-consuming device. Furthermore, the support plate is connected to the first partition beam, together forming a first compartment for accommodating the individual battery cells, with the support plate directly bearing the load of the individual battery cells. This structure constructs a double thermal barrier by creating gaps between the outer periphery of the first partition beam and the inner periphery of the outer frame, and between the support plate and the outer frame. When heat generated by the individual battery cells is transferred to the outside of the housing assembly, its heat conduction path must sequentially pass through the gap area between the first partition beam and the outer frame, 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 individual battery cells within the optimal operating range, improving the reliability of the battery device.

[0024] 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.

[0025] 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.

[0026] In one or more embodiments of the first aspect, the first partition beam 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; wherein, the first internal beam is a first beam body and the second internal beam is a second beam body.

[0027] In the above scheme, setting the first and second internal beams of the first partition beam as beam bodies with different densities balances the overall weight of the first partition beam. This makes it easier to match the total weight of the battery device with the weight requirements of the power supply device, improving the compatibility between the battery device and the power supply device. Furthermore, the first and second internal beams can serve as assembly references for each other, reducing the assembly difficulty of the housing components. Simultaneously, the first internal beam connects the two second internal beams, improving the structural stability of the first partition beam.

[0028] In one or more embodiments of the first aspect, multiple battery cells are provided, and the multiple battery cells include multiple battery cell assemblies; the housing assembly also includes a second partition beam, which divides the first compartment into multiple first sub-compartments, and the multiple battery cell assemblies correspond one-to-one with the multiple first sub-compartments, with each battery cell assembly disposed in its corresponding first sub-compartment.

[0029] 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.

[0030] In one or more embodiments of the first aspect, multiple second partition beams are provided, each 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. The first sub-partition beam is a first beam body, and the second sub-partition beam is a second beam body.

[0031] In the above scheme, setting the first and second sub-separation beams of the second partition beam as beam bodies with different densities balances the overall weight of the second partition beam. This makes it easier to match the total weight of the battery device with the weight requirements of the power supply device, improving the compatibility between the battery device and the power supply device. Furthermore, the first and second internal beams can serve as assembly references for each other, reducing the assembly difficulty of the housing components. Simultaneously, the first internal beam connects the two second internal beams, improving the structural stability of the first partition beam.

[0032] In one or more embodiments of the first aspect, the housing assembly further includes connecting members that connect the first partition beam and the outer frame, and a plurality of connecting members are spaced apart circumferentially along the first partition beam.

[0033] In the above scheme, multiple connecting components can improve the connection stability of the first partition beam. Furthermore, since the multiple connecting components are spaced apart circumferentially along the first partition beam, external forces can be more effectively dispersed, reducing the risk of localized stress concentration and improving the reliability of the enclosure assembly.

[0034] In one or more embodiments of the first aspect, the plurality of connecting components include a first connecting component, the first connecting component being integrally formed with a first partition beam; and / or, the plurality of connecting components include a second connecting component, the second connecting component being integrally formed with a first partition beam.

[0035] In the above solution, the connecting components and the first partition beam 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 components and the first partition beam.

[0036] In one or more embodiments of the first aspect, the housing assembly further includes a base plate connected to the outer frame, the base plate being located on the side of the support plate away from the battery cell along the thickness direction of the support plate.

[0037] 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 housing assembly and damaging individual battery cells, thus improving the reliability of the battery device.

[0038] 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.

[0039] In the above scheme, the absence of individual battery cells between the support plate and the base plate may cause the weight of the battery pack to deviate from the weight requirements of the power-consuming device. With a fixed volume of the housing assembly, simultaneously arranging first and second beams of different densities within the housing assembly makes it easier to match the total weight of the battery pack to the weight requirements of the power-consuming device, improving the compatibility between the battery pack and the power-consuming device. Furthermore, the spacing between the support plate and the outer frame improves the thermal insulation performance of the battery pack, while the base plate reduces the risk of foreign objects entering the housing assembly and damaging individual battery cells, thus improving the reliability of the battery pack.

[0040] In one or more embodiments of the first aspect, the thickness of the base plate is H, which satisfies: 1.2mm≤H≤1.5mm.

[0041] In the above scheme, when H≥1.2mm, the thickness of the base plate is larger, the energy of the base plate to resist impact is greater, and the battery device has higher reliability; when H≤1.5mm, it is beneficial to enable the battery device to have higher energy density; therefore, when 1.2mm≤H≤1.5mm, the battery device can balance high reliability and energy density.

[0042] In one or more embodiments of the first aspect, the support plate is a profile plate.

[0043] In the above scheme, since the support plate is a profile plate, it can have high cross-sectional stiffness, thus giving the support plate high structural strength. At the same time, it can also give the support plate high flatness, thus improving its assembly accuracy with the first partition beam.

[0044] In one or more embodiments of the first aspect, the material of the support plate includes aluminum.

[0045] In the above solution, the inclusion of an aluminum support plate allows the support plate to be lighter while maintaining high corrosion resistance.

[0046] 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.

[0047] 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 the external ambient temperature on the heat exchange medium and ensuring higher heat exchange efficiency.

[0048] Secondly, this application provides an electrical device that includes the battery device in one or more of the above embodiments.

[0049] In the above solutions, the battery device and the power consumption device in one or more of the above embodiments have high compatibility.

[0050] 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

[0051] 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:

[0052] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0053] Figure 2 Exploded views of battery devices according to some embodiments of this application;

[0054] Figure 3 Here are exploded views of individual battery cells from some embodiments of this application;

[0055] Figure 4 This is a schematic diagram of the structure of the housing assembly according to some embodiments of this application;

[0056] Figure 5 This is a schematic diagram of the structure of the housing assembly according to other embodiments of this application;

[0057] Figure 6 This is a schematic diagram of the structure of the housing assembly in some embodiments of this application;

[0058] Figure 7 This is a schematic diagram of a portion of the structure of a battery device according to some embodiments of this application;

[0059] Figure 8This is a cross-sectional view of a portion of the structure of a battery device according to some embodiments of this application;

[0060] Figure 9 This is a cross-sectional view of a portion of the structure of a battery device according to some embodiments of this application;

[0061] Figure 10 This is a cross-sectional view of a portion of the structure of a battery device according to some embodiments of this application;

[0062] Figure 11 This is a cross-sectional view of a portion of the structure of a battery device according to other embodiments of this application;

[0063] Figure 12 for Figure 4 A magnified view of a section at point A in the middle;

[0064] Figure 13 for Figure 4 A magnified view of a section at point B.

[0065] The reference numerals in the detailed embodiments are as follows:

[0066] 1000 - Vehicle; 200 - Controller; 300 - Motor; 100 - Battery Unit; 11 - Housing Assembly; 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 - First Dividing Beam; 11 81-First internal beam; 1182-Second internal beam; 119-Support plate; 1191-Flow channel; 120-Heat insulation pad; 1201-Cavity; 125-Second partition beam; 1251-First sub-partition beam; 1252-Second sub-partition beam; 101-Battery cell assembly; 1011-End plate; 12-Battery cell; 121-Shell; 1211-End cap; 1212-Shell; 122-Electrode assembly; 123-Electrode terminal; 124-Adapter; 21-First beam; 22-Second beam; 23-External mounting beam; 24-First connecting bracket; 25-Second connecting bracket; X-First direction; Y-Second direction; Z-Thickness direction of support plate. Detailed Implementation

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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).

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.).

[0078] 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.

[0079] 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.

[0080] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0081] 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.).

[0082] 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.

[0083] 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.

[0084] 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.

[0085] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0093] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0094] 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.

[0095] 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.

[0096] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0097] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0098] In some implementations, the electrode assembly is a stacked structure.

[0099] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0100] 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.

[0101] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0102] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0103] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0104] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] In related technologies, a battery cell generally includes a casing and an electrode assembly. The casing may include a housing and an end cap. The housing has an opening. After the electrode assembly is installed inside the housing, the opening of the housing can be closed by the end cap to form a sealed space inside the housing to accommodate the electrode assembly.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0114] 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.

[0115] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0116] In a typical battery cell structure, a battery cell includes a casing, electrode assemblies, and electrolyte. The casing includes end caps and a housing; the end caps close the opening of the housing to define a space for accommodating the electrode assemblies. In some embodiments, the casing can be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc.

[0117] The development of battery technology must take into account multiple design factors, such as reliability, cycle life, discharge capacity, charge / discharge rate, energy density and other performance parameters. In addition, the compatibility of battery devices must also be considered.

[0118] Typical electrical devices impose certain weight requirements on battery packs. Matching the weight requirements of the battery pack with those of the electrical device ensures high structural stability. Taking a vehicle as an example, the battery pack, as a single component accounting for a significant portion of the vehicle's weight, directly impacts the vehicle's dynamic performance. For instance, when the battery pack weight is highly matched to the vehicle platform's design requirements, the center of gravity remains within the design threshold range. This allows chassis tuning parameters such as suspension damping coefficients and spring stiffness to effectively perform their preset functions, resulting in good roll control and tire grip during high-speed lane changes and cornering. With societal development and technological advancements, battery swapping technology has gradually become a crucial energy replenishment method for vehicles. When the same vehicle model needs to accommodate battery packs with different energy densities, the limited volume of the battery pack required for that model, coupled with the fact that the beams of typical battery pack housings are generally made of a single-density material, makes it difficult to adapt to weight variations in battery packs with different energy densities, resulting in poor battery pack adaptability.

[0119] In view of this, this application provides a battery device including a battery cell assembly and a housing assembly. The housing assembly has a receiving cavity, and the battery cell assembly is disposed within the receiving cavity. The volumetric energy density of the battery device is greater than or equal to 50Wh / L and less than or equal to 1000Wh / L, and the volumetric energy density of the battery device is the ratio of the total energy of the battery cell assembly to the volume of the housing assembly. The housing assembly includes a first beam and a second beam, the density of the first beam being less than the density of the second beam. When the volume of the housing assembly is constant, by simultaneously arranging the first beam and the second beam with different densities within the housing, it is easier to match the total weight of battery devices with different volumetric energy densities to the weight requirements of the power supply device when the volumetric energy density of the battery device fluctuates significantly (greater than or equal to 50Wh / L and less than or equal to 1000Wh / L), thereby improving the compatibility between the battery device and the power supply device.

[0120] The technical solutions described in the embodiments of this application are applicable to battery cells, battery devices, and electrical devices using battery devices.

[0121] 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.

[0122] For example, Figure 1This is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of this application. The vehicle 1000 can be a gasoline vehicle, a natural gas 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 for the power requirements of 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 gasoline or natural gas to provide driving power to the vehicle 1000.

[0123] 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.

[0124] For example, please refer to Figure 2 , Figure 2 The image shown 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 with a hollow interior, into which the plurality of battery cells 12 are housed. Figure 2 As shown, these are referred to as the first housing 111 and the second housing 112, respectively, and are fastened together. The shapes of the first housing 111 and the second housing 112 can be determined according to the combined shape of multiple 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 can 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 with a closed cavity. Multiple battery cells 12 are connected in parallel, series, or mixed configurations and placed inside the housing formed by the fastening of the first housing 111 and the second housing 112.

[0125] 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 via a conductive mechanism.

[0126] 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.

[0127] Please refer to Figure 3 As shown, Figure 3 The image shows 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 for accommodating 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 may have 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.

[0128] 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 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.

[0129] According to some embodiments of this application, please refer to Figures 4-7 This application provides a battery device 100, which includes a battery cell assembly 101 and a housing assembly 11. The housing assembly 11 has a receiving cavity, and the battery cell assembly 101 is disposed within the receiving cavity. The volumetric energy density of the battery device 100 is greater than or equal to 50 Wh / L and less than or equal to 1000 Wh / L, and the volumetric energy density of the battery device 100 is the ratio of the total energy of the battery cell assembly 101 to the volume of the housing assembly 11. The housing assembly 11 includes a first beam 21 and a second beam 22, and the density of the first beam 21 is less than the density of the second beam 22.

[0130] 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.

[0131] In some embodiments, the battery cell assembly 101 includes a plurality of battery cells 12, and the housing assembly 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.

[0132] The volumetric energy density of the battery device 100 can be any value between 50 Wh / L and 1000 Wh / L, for example, 50 Wh / L, 60 Wh / L, 70 Wh / L, 80 Wh / L, 90 Wh / L, 00 Wh / L, 110 Wh / L, 120 Wh / L, 130 Wh / L, 140 Wh / L, 150 Wh / L, 160 Wh / L, 170 Wh / L, 180 Wh / L, 190 Wh / L, 200 Wh / L, 210 Wh / L, 220 Wh / L, 230 Wh / L, 240 Wh / L, 250 Wh / L. h / L, 260Wh / L, 270Wh / L, 280Wh / L, 290Wh / L, 300Wh / L, 310Wh / L, 320Wh / L, 330Wh / L, 340Wh / L, 350Wh / L, 360Wh / L, 370Wh / L, 380W h / L, 390Wh / L, 400Wh / L, 410Wh / L, 420Wh / L, 430Wh / L, 440Wh / L, 450Wh / L, 460Wh / L, 470Wh / L, 480Wh / L, 490Wh / L, 500Wh / L, 510W h / L, 520Wh / L, 530Wh / L, 540Wh / L, 550Wh / L, 560Wh / L, 570Wh / L, 580Wh / L, 590Wh / L, 600Wh / L, 610Wh / L, 620Wh / L, 630Wh / L, 640W h / L, 650Wh / L, 660Wh / L, 670Wh / L, 680Wh / L, 690Wh / L, 700Wh / L, 710Wh / L, 720Wh / L, 730Wh / L, 740Wh / L, 750Wh / L, 760Wh / L, 770W The values ​​are any one of the following: h / L, 780Wh / L, 790Wh / L, 800Wh / L, 810Wh / L, 820Wh / L, 830Wh / L, 840Wh / L, 850Wh / L, 860Wh / L, 870Wh / L, 880Wh / L, 890Wh / L, 900Wh / L, 910Wh / L, 920Wh / L, 930Wh / L, 940Wh / L, 950Wh / L, 960Wh / L, 970Wh / L, 980Wh / L, 990Wh / L, 1000Wh / L, or any range between two of them.

[0133] In some embodiments, the housing assembly 11 includes a first housing 111 and a second housing 112, which are fastened together to form a receiving cavity for housing the battery cell assembly 101. In some embodiments, the first housing 111 includes a frame and a plate, with the frame surrounding the plate, and the frame, plate, and second housing 112 together defining the receiving cavity. The frame includes a plurality of beams connected end to end, and the first beam 21 and the second beam 22 can be any of the plurality of beams. In some embodiments, a plurality of beams are disposed inside the receiving cavity, and the first beam 21 and the second beam 22 can be any of the plurality of beams. The beams inside the receiving cavity can be expansion beams, partition beams, etc. The expansion beams are used to resist the expansion force of the battery cell assembly 101, and the partition beams are used to divide the receiving cavity into multiple sub-spaces, some of which are used to house the battery cell assembly 101. Of course, in some other embodiments, the first beam 21 and the second beam 22 may also be reinforcing beams in the box assembly 11.

[0134] The density of the first beam 21 is less than that of the second beam 22, which means that when the volumes of the first beam 21 and the second beam 22 are the same, the weights of the first beam 21 and the second beam 22 are different, and the weight of the first beam 21 is less than that of the second beam 22.

[0135] In the technical solution of this application embodiment, when the volume of the housing assembly 11 is fixed, by simultaneously arranging the first beam 21 and the second beam 22 with different densities inside the housing assembly 11, it is easier to match the total weight of the battery devices 100 with different volumetric energy densities to the weight requirements of the power-consuming device for the battery devices 100 when there is a large fluctuation range in the volumetric energy density of the battery device 100 (the volumetric energy density of the battery device 100 is greater than or equal to 50Wh / L and less than or equal to 1000Wh / L), thereby improving the adaptability of the battery device 100 to the power-consuming device.

[0136] According to some embodiments of this application, please refer to Figures 4-7 The material of the first beam 21 includes aluminum and magnesium alloy, and the material of the second beam 22 includes steel and cast iron.

[0137] In some embodiments, the first beam 21 may be formed by processes such as extrusion or 3D printing.

[0138] In some embodiments, the second beam 22 may be formed by processes such as sheet metal bending or casting.

[0139] In some embodiments, the first beam 21 may be made of aluminum alloy.

[0140] In the above scheme, the first beam 21 is made of either aluminum or magnesium alloy, which allows the first beam 21 to be lightweight while possessing high corrosion resistance. The second beam 22 is made of either steel or cast iron, which allows the second beam 22 to be heavier while possessing high structural strength and low cost. By simultaneously arranging the first beam 21, made of aluminum and magnesium alloy, and the second beam 22, made of steel and cast iron, within the housing assembly 11, the battery device 100 can more easily match the requirements of the electrical device for weight, corrosion resistance, structural strength, and cost, thereby improving the compatibility between the battery device 100 and the electrical device. At the same time, the battery device 100 can also achieve a balance between high corrosion resistance, high structural strength, and low cost.

[0141] According to some embodiments of this application, please refer to Figures 4-11 The first beam 21 is a profile beam, and the second beam 22 is a sheet metal beam.

[0142] Please refer to Figure 4 and Figure 5 as well as Figures 8-10 Profile beams typically have cavities extending in a single direction internally. The cross-section of a profile beam generally does not have breaks or joints. Profile beams generally do not have multiple overlapping and contacting walls. Please refer to [reference needed]. Figure 4 and Figure 5 as well as Figure 11 A sheet metal beam generally includes a main body, a first end, and a second end, located at opposite ends of the main body. The first end connects to the main body to form a beam with a cavity, or the first end connects to the second end to form a beam with a cavity, or vice versa. The cross-section of a sheet metal beam typically features breaks and joints. Sheet metal beams generally have at least two overlapping and contacting wall sections.

[0143] In the above scheme, the first beam 21 is a profile beam, which enables the first beam 21 to have high cross-sectional stiffness and thus high structural strength. Simultaneously, it also enables the first beam 21 to have high flatness, resulting in high assembly accuracy. The second beam 22 is a sheet metal beam, which enables the second beam 22 to have high processing efficiency, low cost, and a more flexible cross-sectional shape. By simultaneously arranging profile beams and sheet metal beams within the housing assembly 11, the battery device 100 can more easily match the requirements of the power supply device for structural strength, assembly accuracy, processing efficiency, cross-sectional shape, and cost, improving the compatibility between the battery device 100 and the power supply device. Furthermore, the beams of the battery device 100 can balance high structural strength, high assembly accuracy, high processing efficiency, and low cost.

[0144] According to some embodiments of this application, please refer to Figures 4-7 The first beam 21 has at least one first cavity, and the first cavity is filled with filling material.

[0145] Since the first cavity of the profile beam generally has high structural stability, the risk of excessive deformation of the profile beam caused by the filling material in the first cavity is low.

[0146] In some embodiments, the density of the filler material is greater than the density of the second beam 22. The density of the filler material is greater than the density of the first beam 21.

[0147] In the above scheme, arranging the filling material inside the first cavity increases the weight of the battery device 100, making it easier to match the total weight of battery devices 100 with different volumetric energy densities to the weight requirements of the power supply device, thus improving the compatibility between the battery device 100 and the power supply device. Simultaneously, utilizing the inherent internal space of the first beam 21 to arrange the filling material helps the battery device 100 achieve a higher volumetric energy density.

[0148] According to some embodiments of this application, please refer to Figures 4-7 The filling material can be one of ductile iron, marble, or concrete.

[0149] According to some embodiments of this application, please refer to Figures 4-7 The box assembly 11 includes an outer frame 114, which includes multiple side beams connected end to end, at least one of which is a first beam 21.

[0150] In some embodiments, the housing assembly 11 includes an outer frame 114, a bottom plate 113, and a second housing 112. The outer frame 114 surrounds the bottom plate 113 to form an open receiving cavity, and the second housing 112 closes the opening. The battery device 100 also includes a first seal for sealing the gap between the second housing 112 and the outer frame 114. At least one side beam is a first beam 21, which is a profile beam. Because the profile beam has high flatness, the connection position between the second housing 112 and the outer frame 114 (the connection method can be welding and / or bolt fastening, etc.) can be set in the profile beam area. With this arrangement, the risk of sealing failure between the second housing 112 and the outer frame 114 is low, and the battery device 100 has high reliability.

[0151] In some embodiments, the housing assembly 11 includes an outer frame 114, a bottom plate 113, and a second housing 112. The outer frame 114 surrounds the bottom plate 113 to form a receiving cavity with two opposing openings. The second housing 112 closes one opening, and the bottom plate 113 closes the other opening. The battery device 100 also includes a second seal for sealing the gap between the bottom plate 113 and the outer frame 114. At least one side beam is a first beam 21, which is a profile beam. Because the profile beam has high flatness, the connection position between the bottom plate 113 and the outer frame 114 (the connection method can be welding and / or bolt fastening, etc.) can be set in the profile beam area. With this arrangement, the risk of sealing failure between the bottom plate 113 and the outer frame 114 is low, and the battery device 100 has high reliability.

[0152] In some embodiments, multiple edge beams are integrally formed.

[0153] In other embodiments, multiple side beams are welded together.

[0154] The shape of the outer border 114 can be, but is not limited to, polygons, circles, convex polygons, irregular polygons, etc. Of course, the shape of the outer border 114 can also be a combination of multiple regular shapes.

[0155] In some embodiments, the housing assembly 11 further includes an external mounting beam 23, which is a profile beam. The external mounting beam 23 is disposed outside the outer frame 114 and connected to the side beam of the first beam 21 in the outer frame 114. This arrangement enables the external mounting beam 23 to have high connection stability with the outer frame 114, reducing the risk of weak areas (weak areas caused by factors such as weld failure or fastener failure) at the connection point. This improves the connection stability of the battery device 100 after it is mounted on the electrical device, allowing the electrical device to have higher reliability.

[0156] In the above scheme, since the sealing performance requirements of the outer frame 114 are high, that is, its flatness requirements are higher, setting at least one side beam of the outer frame 114 as a profile beam is beneficial to enable the outer frame 114 to have a higher flatness, thereby having a higher assembly accuracy, reducing the risk of sealing failure of the battery device 100, and improving the reliability of the battery device 100.

[0157] According to some embodiments of this application, please refer to Figures 4-7 Each side beam is the first beam body 21.

[0158] Since each side beam is the first beam body 21, when multiple side beams are formed separately and connected by welding or bolting, the high flatness and processing accuracy can significantly reduce the risk of excessive gaps and sealing failure in the assembled outer frame 114. At the same time, it can also improve the life of the seals of the battery device 100.

[0159] In the above scheme, since each side beam is the first beam body 21, the assembly accuracy of the outer frame 114 can be further improved, the risk of sealing failure of the battery device 100 can be further reduced, and the reliability of the battery device 100 can be further improved.

[0160] According to some embodiments of this application, please refer to Figures 4-7 The housing assembly 11 also includes at least one first partition beam 118, which is located within the space enclosed by the outer frame 114, and at least one first partition beam 118 is a second beam 22.

[0161] Since the first partition beam 118 is a sheet metal beam, its cross-sectional shape design is more flexible. For example, it can be set as L-shaped, I-shaped, or Z-shaped. While ensuring that the first partition beam 118 has high structural strength, its cross-sectional shape can be flexibly designed according to the distribution characteristics of the battery cell assembly 101, so that more space can be used to accommodate the battery cell assembly 101.

[0162] In the above scheme, by setting at least one first partition beam 118 as a sheet metal beam, the cross-sectional shape parameters of the first partition beam 118 can be flexibly optimized according to the beam layout in the internal space of the battery device 100 and the distribution characteristics of the battery cell assembly 101. This allows the battery cell assembly 101 to have high space utilization while maintaining high structural strength in the housing assembly 11, thereby effectively improving the overall energy density of the battery device 100.

[0163] According to some embodiments of this application, please refer to Figures 4-7 The housing assembly 11 also includes a first partition beam 118, an outer frame 114, and a support plate 119. The first partition beam 118 is disposed inside the outer frame 114, and the outer periphery of the first partition beam 118 is spaced apart from the inner periphery of the outer frame 114. The support plate 119 is connected to the first partition beam 118 and forms a first compartment 115 for accommodating the battery cell 12. The support plate 119 carries the battery cell 12.

[0164] In some embodiments, the material of the support plate 119 may include metal, such as steel, aluminum (including aluminum alloys), etc.

[0165] In some embodiments, the material of the support plate 119 may include fiber-reinforced composite materials, etc.

[0166] 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.

[0167] The outer periphery of the first partition beam 118 is spaced apart from the inner periphery of the outer frame 114, meaning that a gap is provided between the outer periphery of the first partition beam 118 and the inner periphery of the outer frame 114. Furthermore, since the support plate 119 is connected to the first partition beam 118 to form a first compartment 115 for accommodating the battery cell 12, no battery cell 12 is disposed between the first partition beam 118 and the outer frame 114.

[0168] In the above scheme, since no battery cell 12 is provided between the first partition beam 118 and the outer frame 114, the weight of the battery device 100 may deviate from the weight requirement of the power-consuming device. When the volume of the housing assembly 11 is fixed, by simultaneously arranging the first beam 21 and the second beam 22 with different densities within the housing assembly 11, it is easier to match the total weight of the battery device 100 with the weight requirement of the power-consuming device, thereby improving the compatibility between the battery device 100 and the power-consuming device.

[0169] According to some embodiments of this application, please refer to Figures 4-7 The support plate 119 and the outer frame 114 are spaced apart.

[0170] In some embodiments, 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.

[0171] 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.

[0172] 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.

[0173] In some embodiments, please refer to Figure 4 as well as Figures 8-10The battery cell assembly 101 includes an end plate 1011 and a plurality of battery cells 12. Two end plates 1011 are provided, spaced apart along a first direction X. The plurality of battery cells 12 are located between the two end plates 1011. A heat insulation pad 120 is disposed on the side of the end plate 1011 opposite to the battery cells 12 along the first direction X. In some embodiments, the first partition beam 118 includes two first internal beams 1181 and two second internal beams 1182. The two first internal beams 1181 are spaced apart along the 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 two first side beams 11411. A plurality of 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 beam 1181 along the first direction X. In some embodiments, the housing assembly 11 further includes a second partition beam 125, which divides the first compartment 115 into a plurality of 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 second 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. 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 assembly 11 in the first direction X, and further improve the heat preservation performance of the battery device 100.

[0174] In some embodiments, please refer to Figure 4 as well as Figures 8-10 The heat insulation pad 120 has a cavity 1201 inside. 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. In some embodiments, the cavity 1201 can be formed in a second process after the heat insulation pad 120 is formed, for example, by machining. In the above solutions, 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.

[0175] In some embodiments, the thermal conductivity of the heat insulation pad 120 is less than that of the first partition beam 118. This means that the heat transfer rate inside the heat insulation pad 120 is lower than the heat transfer rate inside the first partition beam 118. In the above solution, because the thermal conductivity of the heat insulation pad 120 is less than that of the first partition beam 118, the difficulty of heat exchange between the battery cell assembly 101 and the first partition beam 118 is increased. This further reduces the risk of excessive heat loss from the battery cell assembly 101 to the outside of the housing assembly 11 via the first partition beam 118 and the frame, thus improving the thermal insulation performance of the battery device 100.

[0176] In some embodiments, the heat insulation pad 120 is made of fiber-reinforced composite material, and the first partition beam 118 is made of metal.

[0177] In some embodiments, please refer to Figures 4-7 The outer frame 114 includes a first outer frame 1141 and a second outer frame 1142. A first partition beam 118 is disposed inside the first outer frame 1141, with its outer periphery 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, connected to the first outer frame 1141, and encloses the bottom plate 113 to form a second compartment 116. The battery device 100 also includes an electronic control module, which is disposed in the second compartment 116. In some embodiments, both the first outer frame 1141 and the second outer frame 1142 are first beams 21.

[0178] In some embodiments, the electronic control module is housed in a single enclosure. For example, a high-voltage box is provided on the base plate 113, and the electronic control module is disposed within the high-voltage box. In some embodiments, the electronic control module 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 may be directly arranged within the second compartment 116. For example, components such as sensors, fuses, and relays may be distributed and assembled on the base plate 113 within the second compartment 116 or on mounting brackets within the second compartment 116. The outer periphery of the first partition beam 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 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 and the battery cell assembly 101 operate within a suitable temperature range. In the above scheme, since the outer periphery of the first partition beam 118 is spaced apart from the inner periphery of the first outer frame 1141, a gap exists between the first partition beam 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 needs to pass through the gap area between the first partition beam 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.

[0179] In some embodiments, the first compartment 115 and the second compartment 116 are spaced apart along a first direction X. The battery device 100 further includes a battery management unit disposed between the first compartment 115 and the second compartment 116 along the first direction X. In some embodiments, please refer to... Figure 5 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. 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, and 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, and the second ends of the third side beams 11421 are 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 other embodiments, please refer to Figure 12The first side beam 11411, which is connected to the third side beam 11421, is provided with a through-hole 1145 extending along the first direction X, through which the wire harness can pass. Please refer to... Figure 6 In some other embodiments, along the first direction X, the battery management unit is located between the first side beam 11411 connected to the third side beam 11421 and the first internal beam 1181 near the first side beam 11411. In some embodiments, the battery management unit is used to manage the battery cells 12. For example, the battery management unit can detect parameters such as voltage, current, and temperature of the battery cells 12, adjust the charging and discharging state of the battery cells 12, integrate functions such as overvoltage protection, overcurrent protection, short circuit protection, and temperature protection, record historical data of the battery cells 12, such as the number of charging cycles and temperature curves, and communicate with the power-consuming device. In the above scheme, the gap between the first compartment 115 and the second compartment 116 improves the thermal insulation performance of the battery device 100 while also accommodating the battery management unit, making the structure of the battery device 100 more compact and improving the energy density of the battery device 100.

[0180] The outer periphery of the first partition beam 118 is spaced apart from the inner periphery of the outer frame 114, meaning that a gap is formed between the outer periphery of the first partition beam 118 and the inner periphery of the outer frame 114. The air layer in the gap can provide heat insulation and prevent the formation of thermal bridges. Similarly, the support plate 119 is spaced apart from the outer frame 114, meaning that a gap is formed between the support plate 119 and the outer frame 114. The air layer in the gap can provide heat insulation and prevent the formation of thermal bridges. In other words, the presence of the gap 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.

[0181] By spacing the outer periphery of the first partition beam 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.

[0182] In the above scheme, when the volume of the housing assembly 11 is fixed, the relatively small size of the support plate 119, due to its spacing from the outer frame 114, may cause the weight of the battery device 100 to deviate from the weight requirements of the power-consuming device. By simultaneously arranging the first beam 21 and the second beam 22 with different densities within the housing assembly 11, it is easier to match the total weight of the battery device 100 with the weight requirements of the power-consuming device, thus improving the compatibility between the battery device 100 and the power-consuming device. Furthermore, the support plate 119 is connected to the first partition beam 118, together forming the first compartment 115 for accommodating the battery cell assembly 101, where 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 first partition beam 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 assembly 11, its heat conduction path must sequentially pass through the gap area between the first partition beam 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, thereby improving the reliability of the battery device 100.

[0183] According to some embodiments of this application, please refer to Figures 4-7 In the same projection plane perpendicular to the thickness direction of the support plate 119, 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.

[0184] In some embodiments, the orthographic projection of the support plate 119 lies within the orthographic projection of the first partition beam 118 in the same projection plane perpendicular to the thickness direction Z of the support plate.

[0185] In some embodiments, the orthographic projection of the first partition beam 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.

[0186] In the above solution, by setting the thickness direction of the support plate 119 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.

[0187] According to some embodiments of this application, please refer to Figures 4-7The first partition beam 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. The first internal beams 1181 are the first beam body 21, and the second internal beams 1182 are the second beam bodies 22.

[0188] In some embodiments, the first internal beam 1181 may include multiple segments, which are spaced apart along the second direction Y.

[0189] In some embodiments, the second internal beam 1182 may include multiple segments, which are spaced apart along a first direction X.

[0190] 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.

[0191] In some embodiments, please refer to Figure 4 and Figure 13 The first internal beam 1181 and the second internal beam 1182 can be connected by a second connecting bracket 25. The second connecting bracket 25 can be disposed on the outside of the first compartment 115 and connected to the first internal beam 1181 and the second internal beam 1182 by fasteners. This arrangement provides high structural stability between the first internal beam 1181 and the second internal beam 1182 without occupying space in the first compartment 115, which is beneficial for the battery device 100 to have a high energy density. On the other hand, the gap between the outer periphery of the first partition beam 118 and the inner periphery of the outer frame 114 not only provides the battery device 100 with a high heat preservation effect, but can also be used to accommodate the second connecting bracket 25.

[0192] In the above scheme, the first internal beam 1181 and the second internal beam 1182 of the first partition beam 118 are set as first beam body 21 and second beam body 22 with different densities. This can balance the overall weight of the first partition beam 118, thereby making it easier to match the total weight of the battery device 100 with the weight requirements of the power consumption device, and improving the compatibility between the battery device 100 and the power consumption device. In addition, 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 housing assembly 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 first partition beam 118.

[0193] According to some embodiments of this application, please refer to Figures 4-7The battery cell 12 is provided in multiple ways, and the multiple battery cells 12 include multiple battery cell assemblies 101; the housing assembly 11 also includes a second partition beam 125, which divides the first compartment 115 into multiple first sub-compartments 1151. The multiple battery cell assemblies 101 correspond one-to-one with the multiple first sub-compartments 1151, and each battery cell assembly 101 is located in its corresponding first sub-compartment 1151.

[0194] In some embodiments, the second partition beam 125 may include multiple partition beam segments integrally formed.

[0195] The shape of the second partition beam 125 may include, but is not limited to, polygons, circles, convex polygons, irregular polygons, etc.

[0196] In some embodiments, please refer to Figure 4 and Figure 12 The second partition beam 125 and the first partition beam 118 can be connected by the first connecting bracket 24. In the same projection plane perpendicular to the thickness direction Z of the support plate, the orthographic projection of the first connecting bracket 24 is located outside the first compartment 115. The first connecting bracket 24 can connect the second partition beam 125 and the first partition beam 118 via fasteners. This arrangement provides high structural stability between the second partition beam 125 and the first partition beam 118 while not occupying space in the first compartment 115, which is beneficial for enabling the battery device 100 to have a high energy density.

[0197] 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.

[0198] According to some embodiments of this application, please refer to Figures 4-7 Multiple second partition beams 125 are provided, 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. Among them, the first sub-partition beam 1251 is the first beam body 21, and the second sub-partition beam 1252 is the second beam body 22.

[0199] 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.

[0200] 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.

[0201] In some embodiments, please refer to Figure 4 and Figure 12 The first sub-separation beam 1251 and the second sub-separation beam 1252 can be connected by the first connecting bracket 24. In the same projection plane perpendicular to the thickness direction Z of the support plate, the orthographic projection of the first connecting bracket 24 is located outside the first compartment 115. The first connecting bracket 24 can connect the first sub-separation beam 1251 and the second sub-separation beam 1252 via fasteners. This arrangement provides high structural stability between the first sub-separation beam 1251 and the second sub-separation beam 1252 while not occupying space in the first compartment 115, which is beneficial for enabling the battery device 100 to have a high energy density.

[0202] In the above scheme, setting the first sub-separation beam 1251 and the second sub-separation beam 1252 of the second separation beam 125 as a first beam body 21 and a second beam body 22 with different densities can balance the overall weight of the second separation beam 125, thereby making it easier to match the total weight of the battery device 100 with the weight requirements of the power consumption device for the battery device 100, and improving the compatibility between the battery device 100 and the power consumption device. In addition, 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 housing assembly 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 first separation beam 118.

[0203] According to some embodiments of this application, please refer to Figures 4-7 The housing assembly 11 also includes a connecting component 117, which connects the first partition beam 118 and the outer frame 114. Multiple connecting components 117 are arranged at circumferential intervals along the first partition beam 118.

[0204] In some embodiments, the connecting component 117 may connect the first partition beam 118 and the outer frame 114 via fasteners.

[0205] In some embodiments, the connecting component 117 may be welded to the first partition beam 118 and the outer frame 114.

[0206] The connecting component 117 can connect the first partition beam 118 and the outer frame 114 directly or indirectly. For example, in some embodiments, the connecting component 117 can connect the first partition beam 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.

[0207] Multiple connecting components 117 are spaced apart along the circumference of the first partition beam 118, which means that when the box assembly 11 is subjected to external force, multiple areas in the circumference of the first partition beam 118 can disperse the external force through the connecting components 117, so that the first partition beam 118 has higher structural stability.

[0208] In the above scheme, multiple connecting components 117 can improve the connection stability of the first partition beam 118. In addition, since multiple connecting components 117 are arranged at intervals along the circumference of the first partition beam 118, external forces can be more effectively dispersed, the risk of local stress concentration can be reduced, and the reliability of the box assembly 11 can be improved.

[0209] According to some embodiments of this application, please refer to Figures 4-7 The plurality of connecting parts 117 include a first connecting part 1171, which is integrally formed with the first partition beam 118; and / or, the plurality of connecting parts 117 include a second connecting part 1172, which is integrally formed with the first partition beam 118.

[0210] 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.

[0211] In some embodiments, the first connecting member 1171 and the first partition beam 118 can be integrally formed by an extrusion process.

[0212] In some embodiments, the first connecting component 1171 and the first partition beam 118 can be integrally formed by sheet metal bending process.

[0213] Compared to connections between the connecting component 117 and the first partition beam 118 formed by welding or fasteners, the risk of weld failure or fastener torque failure between the integrally formed connecting component 117 and the first partition beam 118 is lower. The risk of connection failure due to weak areas existing between the connecting component 117 and the first partition beam 118 is also lower.

[0214] In the above solution, the connecting component 117 and the first partition beam 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 first partition beam 118.

[0215] According to some embodiments of this application, please refer to Figures 4-7 The housing assembly 11 also includes a base plate 113, which is connected to the outer frame 114. Along the thickness direction Z of the support plate, the base plate 113 is located on the side of the support plate 119 away from the battery cell 12.

[0216] In some embodiments, the thermal conductivity of the support plate 119 is lower than that of the base plate 113.

[0217] In some embodiments, the support plate 119 contacts the base plate 113.

[0218] In some embodiments, a cavity 1201 is formed inside the base plate 113, and the presence of the cavity 1201 can improve the thermal insulation performance of the base plate 113.

[0219] In some embodiments, the base plate 113 may be made of metal, such as steel, aluminum, aluminum alloy, etc.

[0220] In some embodiments, the material of the base plate 113 may include fiber-reinforced composite materials, etc.

[0221] In some embodiments, the outer frame 114 may be connected to the base plate 113 by a plurality of fasteners.

[0222] 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.

[0223] 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 housing assembly 11 and damaging the battery cells 12, thereby improving the reliability of the battery device 100.

[0224] According to some embodiments of this application, please refer to Figures 4-7 Along the thickness direction Z of the support plate, the support plate 119 and the base plate 113 are spaced apart.

[0225] 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 assembly 11 via the support plate 119 and the base plate 113.

[0226] 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.

[0227] In the above scheme, since no battery cells 12 are provided between the support plate 119 and the base plate 113, the weight of the battery device 100 may deviate from the weight requirements of the power-consuming device. With a fixed volume of the housing assembly 11, by simultaneously arranging first beams 21 and second beams 22 of different densities within the housing assembly 11, it is easier to match the total weight of the battery device 100 with the weight requirements of the power-consuming device, thus improving the compatibility between the battery device 100 and the power-consuming device. Furthermore, while the spaced arrangement between the support plate 119 and the outer frame 114 improves the thermal insulation performance of the battery device 100, the base plate 113 reduces the risk of foreign objects entering the housing assembly 11 and damaging the battery cells 12, thereby improving the reliability of the battery device 100.

[0228] According to some embodiments of this application, please refer to Figures 4-8 The thickness of the base plate 113 is H, which satisfies: 1.2mm≤H≤1.5mm.

[0229] The thickness of the base plate 113 can be any value between 1.2 mm and 1.5 mm, for example, any one of 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, or any range between two of them.

[0230] In the above scheme, when H≥1.2mm, the thickness of the base plate 113 is relatively large, the base plate 113 has greater impact resistance, and the battery device 100 has higher reliability; when H≤1.5mm, it is beneficial to enable the battery device 100 to have higher energy density; therefore, when 1.2mm≤H≤1.5mm, the battery device 100 can balance high reliability and energy density.

[0231] According to some embodiments of this application, please refer to Figures 4-7 Support plate 119 is a profile plate.

[0232] In some embodiments, the support plate 119 may include multiple profile plates, which are connected (by welding or fasteners, etc.) to form the support plate 119.

[0233] In the above scheme, since the support plate 119 is a profile plate, it can have high cross-sectional stiffness, thereby giving the support plate 119 high structural strength. At the same time, it can also give the support plate 119 high flatness, thereby improving its assembly accuracy with the first partition beam 118.

[0234] According to some embodiments of this application, please refer to Figures 4-7 The material of the support plate 119 includes aluminum.

[0235] In the above solution, the aluminum support plate 119 can make the support plate 119 lighter while having high corrosion resistance.

[0236] According to some embodiments of this application, please refer to Figures 4-7 The support plate 119 has a flow channel 1191 inside for accommodating the heat exchange medium.

[0237] In some embodiments, the base plate 113 is a profile base plate 113, and the cavity of the profile forms a flow channel 1191. In other embodiments, the profile base plate 113 may have a flow channel 1191 processed at its end by machining or other means. The flow channel 1191 connects multiple cavities to adjust the flow direction of the flow channel 1191 and the flow rate of the heat exchange medium.

[0238] 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.

[0239] The heat exchange medium can be a liquid, a gas, or a mixture of gas and liquid.

[0240] The heat exchange medium is used to regulate the temperature of the battery cell 12.

[0241] 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 assembly 11 on the heat exchange medium, so that the heat exchange medium has a higher heat exchange efficiency.

[0242] According to some embodiments of this application, please refer to Figure 1 This application provides an electrical device that includes the battery device 100 in one or more of the above embodiments, the battery device 100 being used to provide electrical energy.

[0243] 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.

[0244] According to some embodiments of this application, please refer to Figures 4-13This application provides a battery device 100 including a battery cell assembly 101 and a housing assembly 11. The housing assembly 11 includes a base plate 113, a support plate 119, an outer frame 114, a first partition beam 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 assembly 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 a first partition beam 118 to form the first compartment 115. The outer frame 114 includes a first outer frame 1141 and a second outer frame 1142. The first partition beam 118 is disposed inside the first outer frame 1141, with its outer periphery 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, connected to the first outer frame 1141, and enclosed with the base plate 113 to form the second compartment 116. The electronic control module 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 of the battery device 100 is disposed between the first compartment 115 and the second compartment 116. The support plate 119 supports the battery cell assembly 101, and the interior of the support plate 119 has flow channels 1191 for accommodating the heat exchange medium. A connecting component 117 connects the first partition beam 118 and the outer frame 114. The outer periphery of the first partition beam 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 thickness direction of the support plate is Z, and the support plate 119 is spaced apart from the bottom plate 113. The first partition beam 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 to 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 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.The housing assembly 11 also includes a second partition beam 125, which divides 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. Multiple second partition beams 125 are provided, including 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 perpendicular to each other. Multiple connecting parts 117 are provided, spaced circumferentially along the first partition beam 118. Multiple connecting components 117 are provided, including 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, and the second connecting component 1172 is integrally formed with the second internal beam 1182. The third connecting component 1173 is separately formed from the first partition beam 118. The battery cell assembly 101 includes multiple battery cells 12 stacked along the first direction X. A heat insulation pad 120 is provided 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.

[0245] The first outer frame 1141 and the second outer frame 1142 are both composed of aluminum profile beams. The second internal beam 1182 is a sheet metal beam, and the first internal beam 1181 is a profile beam. The second sub-dividing beam 1252 is a sheet metal beam. The first sub-dividing beam 1251 is a profile beam. The support plate 119 is a profile base plate 113.

[0246] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a battery cell assembly; a box assembly, wherein a receiving cavity is arranged in the box assembly, and the battery cell assembly is arranged in the receiving cavity; wherein the volumetric energy density of the battery device is greater than or equal to 50 Wh / L and less than or equal to 1000 Wh / L, the volumetric energy density of the battery device is the ratio of the total energy of the battery cell assembly to the volume of the box assembly; the box assembly comprises a first beam body and a second beam body, and the density of the first beam body is less than the density of the second beam body.

2. The battery device according to claim 1, characterized by The material of the first beam body comprises one of aluminum and magnesium alloy, and the material of the second beam body comprises one of steel and cast iron.

3. The battery device of claim 1, wherein The first beam body is a profiled beam, and the second beam body is a sheet metal beam.

4. The battery device of claim 3, wherein The first beam body has at least one first cavity, and a filling material is arranged in the first cavity.

5. The battery device of claim 4, wherein, The material of the filling material comprises one of nodular cast iron, marble and concrete.

6. The battery device of claim 3, wherein The box assembly comprises an outer frame, the outer frame comprises a plurality of edge beams connected in head-to-tail manner, and at least one of the edge beams is the first beam body.

7. The battery device of claim 6, wherein Each of the edge beams is the first beam body.

8. The battery device of claim 6, wherein, The box assembly further comprises at least one first partition beam, the first partition beam is arranged in a space surrounded by the outer frame, and at least one of the first partition beams is the second beam body.

9. The battery device of claim 1, wherein, The box assembly further comprises a first partition beam, an outer frame and a support plate, the first partition beam is arranged in the outer frame, the outer peripheral side of the first partition beam is arranged in a spaced manner with the inner peripheral side of the outer frame, the support plate is connected with the first partition beam and forms a first bin for accommodating the battery cell, and the support plate carries the battery cell.

10. The battery device of claim 9, wherein, The support plate is arranged in a spaced manner with the outer frame.

11. The battery device of claim 9, wherein, In the same projection plane perpendicular to the thickness direction of the support plate, the outer edge of the front projection of the support plate is arranged in a spaced manner with the inner edge of the front projection of the outer frame.

12. The battery device of claim 9, wherein, The first partition beam comprises two first internal beams and two second internal beams, the two first internal beams are arranged in a spaced manner along a first direction, the two second internal beams are arranged in a spaced manner along a second direction, the first internal beams are connected with the second internal beams, and the second direction, the first direction and the thickness direction of the support plate are perpendicular to each other. The first internal beam is the first beam body, and the second internal beam is the second beam body.

13. The battery device of claim 9, wherein, The battery cell is arranged in a plurality of forms, and the plurality of battery cells comprises a plurality of battery cell assemblies. The box assembly further comprises a second partition beam, the second partition beam divides the first bin into a plurality of first sub-bins, the plurality of battery cell assemblies correspond to the plurality of first sub-bins in a one-to-one manner, and each of the battery cell assemblies is arranged in the corresponding first sub-bin.

14. The battery device of claim 13, wherein, The second partition beam is arranged in a plurality of forms, the plurality of second partition beams comprises a first sub-partition beam and a second sub-partition beam, the first sub-partition beam extends along a second direction, the second sub-partition beam extends along a first direction, and the second direction, the first direction and the thickness direction of the support plate are perpendicular to each other. The first sub-partition beam is the first beam body, and the second sub-partition beam is the second beam body.

15. The battery device of claim 9, wherein, The box assembly further comprises connecting components connecting the first partition beam and the outer frame, and a plurality of the connecting components are arranged along the circumference of the first partition beam.

16. The battery device of claim 15, wherein, The plurality of connecting components comprises a first connecting component integrally formed with the first partition beam; and / or the plurality of connecting components comprises a second connecting component integrally formed with the first partition beam.

17. The battery device of claim 9, wherein, The box assembly further comprises a bottom plate connected to the outer frame, and arranged on the side of the support plate away from the battery monomer along the thickness direction of the support plate.

18. The battery device of claim 17, wherein, The support plate is arranged apart from the bottom plate along the thickness direction of the support plate.

19. The battery device of claim 17, wherein, The thickness of the bottom plate is H, and satisfies: 1.2mm≤H≤1.5mm.

20. The battery device of claim 9, wherein, The support plate is a profiled plate.

21. The battery device of claim 9, wherein, The material of the support plate comprises aluminum.

22. The battery device of claim 9, wherein, An internal flow channel for accommodating a heat exchange medium is formed in the support plate.

23. An electrical device, comprising: The battery device as claimed in any one of claims 1-22 is used to provide electric energy.

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