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, the box body comprises an inner frame, an outer frame, a supporting plate and a connecting part, the inner frame is arranged in the outer frame, the outer peripheral side of the inner frame and the inner peripheral side of the outer frame are arranged at an interval, the connecting part is connected with the inner frame and the outer frame, and the supporting plate and the inner frame are connected to form a first bin for containing the battery monomer assembly; the supporting plate bears the battery monomer assembly, and the supporting plate and the outer frame are arranged at intervals. The battery device has relatively high reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] How to improve the reliability of the battery device is a problem to be solved in the battery technology. CONTENT OF THE INVENTION

[0004] In view of the above problems, the present application provides a battery device and a power utilization device, which can improve the reliability of the battery device.

[0005] In a first aspect, the present application provides a battery device, which comprises a battery monomer assembly and a box body. The box body comprises an inner frame, an outer frame, a support plate and a connecting component. The inner frame is arranged in the outer frame, and the outer periphery of the inner frame is arranged apart from the inner periphery of the outer frame. The connecting component connects the inner frame and the outer frame. The support plate is connected with the inner frame and forms a first compartment for accommodating the battery monomer assembly. The support plate bears the battery monomer assembly, and the support plate is arranged apart from the outer frame.

[0006] In the technical scheme of the present application, the support plate is connected with the inner frame to jointly enclose a first compartment for accommodating the battery monomer assembly, wherein the support plate directly bears the load of the battery monomer assembly. This structure sets a gap between the outer periphery of the inner frame and the inner periphery of the outer frame, and sets a gap between the support plate and the outer frame, thereby constructing a double heat insulation barrier. When the heat generated by the battery monomer assembly is transmitted to the outside of the box body, the heat conduction path needs to pass through the gap area between the inner frame and the outer frame and the gap area between the support plate and the outer frame in sequence, and the two air layers effectively block the formation of the heat bridge. This hierarchical heat insulation design is conducive to stabilizing the working temperature of the battery monomer assembly within the optimal working condition range, thereby improving the reliability of the battery device.

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

[0008] In the above scheme, the support plate has dual functions of structural bearing and heat management in the battery device, which can make the layout of the battery device more compact, thereby improving the overall energy density. In addition, the gap between the support plate and the outer frame forms an air layer, which can effectively reduce the interference of the external environment temperature of the box body on the heat exchange medium, so that the heat exchange medium has a high heat exchange efficiency.

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

[0010] In the above scheme, by setting the thickness direction of the support plate as the assembly positioning reference, the assembly accuracy of the support plate and the outer frame can be improved, so that the setting gap between the two can be accurately controlled, which is beneficial to the heat conduction efficiency of the battery device. In addition, such design is also beneficial to the automated production of the battery device.

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

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

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

[0014] In the above scheme, the gap between the first internal beam and the first side beam, and the gap between the second internal beam and the second side beam, effectively block the formation of thermal bridges, which is beneficial to stabilize the working temperature of the battery monomer assembly within the optimal working condition range, and improves the reliability of the battery device.

[0015] In one or more embodiments of the first aspect, the battery monomer assembly includes a plurality of battery monomers stacked along a first direction. The battery device further includes a thermal insulation pad, which is arranged at at least one end of the battery monomer assembly along the first direction.

[0016] In the above scheme, in the path of heat transfer of the battery monomer assembly to the outside of the box body in the first direction, the arrangement of the thermal insulation pad can reduce the heat loss of the battery monomer assembly, and further improve the heat preservation performance of the battery device.

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

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

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

[0020] In the above solution, since the thermal conductivity of the heat insulation pad is less than the thermal conductivity of the inner frame, the heat exchange between the battery monomer assembly and the inner frame is increased, thereby further reducing the risk of excessive heat of the battery monomer assembly being lost to the outside of the box through the inner frame and the frame, and improving the heat preservation performance of the battery device.

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

[0022] In the above solution, while improving the heat preservation performance of the battery device, the heat insulation pad comprising a fiber-reinforced composite material and the inner frame comprising a metal can improve the structural strength of the box.

[0023] In one or more embodiments of the first aspect, the box further comprises a partition beam, the partition beam divides the first compartment into a plurality of first sub-compartments, the battery monomer assembly is provided in plurality, the plurality of battery monomer assemblies correspond one-to-one to the plurality of first sub-compartments, and each battery monomer assembly is arranged in the first sub-compartment corresponding thereto.

[0024] In the above solution, the first sub-compartment can serve as an assembly reference for the battery monomer assembly corresponding thereto, which is conducive to reducing the assembly difficulty of the battery device and improving the assembly efficiency of the battery device.

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

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

[0027] In one or more embodiments of the first aspect, the connecting component is provided in plurality, and the plurality of connecting components are arranged at intervals along the circumference of the inner frame.

[0028] In the above solution, the plurality of connecting components can improve the connection stability of the inner frame. In addition, since the plurality of connecting components are arranged at intervals along the circumference of the inner frame, the external force can be more effectively dispersed, the risk of local stress concentration is reduced, and the reliability of the box is improved.

[0029] In one or more embodiments of the first aspect, the connecting component is provided in a plurality, the plurality of connecting components includes a first connecting component which is integrally formed with the inner frame; and / or, the plurality of connecting components includes a second connecting component which is integrally formed with the inner frame.

[0030] In the above scheme, the connecting component and the inner frame are processed by the integrally forming mode, which can simplify the assembly process of the battery device on the one hand, and can reduce the risk of connection failure due to the existence of weak areas between the connecting component and the inner frame.

[0031] In one or more embodiments of the first aspect, the connecting component is provided in a plurality, the plurality of connecting components includes a first connecting component which is integrally formed with the inner frame; and / or, the plurality of connecting components includes a second connecting component which is integrally formed with the inner frame.

[0032] In the above scheme, the third connecting component is separately formed with the inner frame, which can improve the connection stability of the inner frame, and also make the battery device have lower cost, and improve the convenience of maintaining the box body.

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

[0034] In the above scheme, the bottom plate is arranged between the support plate and the outer frame, which can improve the heat preservation performance of the battery device, and also can reduce the risk of foreign matter entering the box body to damage the battery monomer, and improve the reliability of the battery device.

[0035] In one or more embodiments of the first aspect, the support plate and the bottom plate are arranged in a spaced manner along the thickness direction of the support plate.

[0036] In the above scheme, since the support plate and the bottom plate are arranged in a spaced manner along the thickness direction of the support plate, there is a gap between the support plate and the bottom plate. When the heat generated by the battery monomer assembly is transmitted to the outside of the box body, the heat conduction path needs to pass through the gap area between the support plate and the bottom plate in turn, and the air layer in the gap area effectively blocks the formation of the heat bridge, which can further improve the heat preservation performance of the battery device and improve the reliability of the battery device.

[0037] In one or more embodiments of the first aspect, a heat insulation material is arranged between the support plate and the bottom plate.

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

[0039] In one or more embodiments of the first aspect, the outer frame comprises a first outer frame and a second outer frame, the inner frame is arranged in the first outer frame, and an outer circumferential side of the inner frame is arranged in a spaced manner with an inner circumferential side of the first outer frame; the second outer frame is arranged outside the first outer frame, and the second outer frame is connected to the first outer frame and encloses the bottom plate to form a second compartment; and the battery device further comprises an electronic control module, and the electronic control module is arranged in the second compartment.

[0040] In the above scheme, since the outer circumferential side of the inner frame is arranged in a spaced manner with the inner circumferential side of the first outer frame, there is a gap between the inner frame and the first outer frame. When the heat generated by the battery monomer assembly is transmitted to the second compartment, the heat conduction path needs to pass through the gap area between the inner frame and the first outer frame in turn, and the air layer in the gap area effectively blocks the formation of the heat bridge, thereby improving the reliability of the electronic control module.

[0041] In one or more embodiments of the first aspect, the first compartment and the second compartment are arranged in a spaced manner along a first direction, and the battery device further comprises a battery management unit, and along the first direction, the battery management unit is arranged between the first compartment and the second compartment.

[0042] In the above scheme, the gap between the first compartment and the second compartment not only improves the heat preservation performance of the battery device, but also accommodates the battery management unit, so that the structure of the battery device is more compact, and the energy density of the battery device is improved.

[0043] In a second aspect, the application provides a power consumption device comprising the battery device in one or more embodiments described above, and the battery device is used to provide electric energy.

[0044] In the above scheme, since the battery device in one or more embodiments described above has high reliability, the power consumption device comprising the battery device in one or more embodiments described above also has high reliability.

[0045] The above description is only a summary of the technical scheme of the application. In order to make the technical means of the application more clear, the specific embodiments of the application can be implemented according to the content of the description, and in order to make other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0046] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered as limiting the application. Moreover, the same reference numerals are used to represent the same components throughout the drawings. In the drawings:

[0047] Figure 1 The structure schematic diagram of the vehicle of some embodiments of the application;

[0048] Figure 2 Exploded view of a battery device for some embodiments of the application;

[0049] Figure 3 Exploded view of a battery cell for some embodiments of the application;

[0050] Figure 4 Structural schematic of a case for some embodiments of the application;

[0051] Figure 5 Axonometric view of a case for some embodiments of the application;

[0052] Figure 6 Structural schematic of a case for further embodiments of the application;

[0053] Figure 7 Structural schematic of a part of a case for some embodiments of the application;

[0054] Figure 8 Structural schematic of a part of a battery device for some embodiments of the application;

[0055] Figure 9 Sectional view of a part of a battery device for some embodiments of the application;

[0056] Figure 10 Sectional view of a part of a battery device for further embodiments of the application;

[0057] Figure 11 Sectional view of a part of a battery device for further embodiments of the application;

[0058] Figure 12 For some embodiments of the application Figure 5 Detail enlargement of point A in Fig. 1 1.

[0059] Reference numerals in the detailed description of the embodiments are as follows:

[0060] 1000-vehicle; 200-controller; 300-motor; 100-battery device; 11-box body; 111-first box body; 112-second box body; 113-bottom 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-communication port; 115-first compartment; 1151-first sub-compartment; 116-second compartment; 117-connection component; 1171-first connection component; 1172-second connection component; 1173-third connection component; 118-inner frame; 1181-first inner beam; 1182-second inner beam; 119-support plate; 1191-flow channel; 120-thermal insulation pad; 1201-cavity; 125-separation beam; 1251-first sub-separation beam; 1252-second sub-separation beam; 126-electronic control module; 127-battery management unit; 101-battery cell assembly; 1011-end plate; 12-battery cell; 121-outer shell; 1211-end cover; 1212-housing; 122-electrode assembly; 123-electrode terminal; 124-adapter tab; X-first direction; Y-second direction; Z-thickness direction of the support plate. DETAILED DESCRIPTION

[0061] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0063] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0064] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a common embodiment.

[0065] In the description of embodiments of the present application, the term“a plurality of” refers to two or more (including two), and similarly, the term“a plurality of groups” refers to two or more groups (including two groups), and the term“a plurality of pieces” refers to two or more pieces (including two pieces).

[0066] In embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0067] The battery cell includes, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0068] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can reduce the risk of short circuit of the positive and negative electrodes, and at the same time allow the active ions to pass through.

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

[0070] By way of example, the positive electrode current collector has two opposite surfaces in the thickness direction of itself, and the positive electrode active material is arranged on either one or both of the two opposite surfaces of the positive electrode current collector.

[0071] By way of example, the positive electrode current collector can adopt a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver plating treatment on the surface, stainless steel with silver plating treatment on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be adopted. The composite current collector can include a high polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0072] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be referred to as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, a composite of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (which can also be referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (which can also be referred to as NCM523), LiNi0.5Co0.25Mn0.25O2 (which can also be referred to as NCM211), LiNi0.6Co0.2Mn0.2O2 (which can also be referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (which can also be referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.85Co0.15Al0.05O2), and modified compounds thereof.

[0073] In some embodiments, the positive electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. When the foamed metal is used as the positive electrode, the foamed metal surface can not be provided with a positive electrode active material, or of course can be provided with a positive electrode active material. As an example, the foamed metal can also be filled or / and deposited with a lithium source material, potassium metal, or sodium metal, the lithium source material being lithium metal and / or a lithium-rich material.

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

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

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

[0077] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either one or both of the two opposite surfaces of the negative current collector.

[0078] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative active material can also be used. These negative active materials can be used alone or in combination of two or more.

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

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

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

[0082] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and to separate the positive electrode and the negative electrode.

[0083] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive electrode and the negative electrode. The electrolyte can be liquid, gel, or solid. In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0084] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro oxalate borate, lithium bis-oxalate borate, lithium difluoro bis-oxalate phosphate, and lithium tetrafluoro oxalate phosphate.

[0085] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyrosulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0086] In some embodiments, the gel electrolyte includes a polymer as a backbone network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0087] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, a composite solid-state electrolyte.

[0088] As an example, the polymer solid-state electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, etc.

[0089] As an example, the inorganic solid-state electrolyte can include one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0090] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

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

[0092] In some embodiments, the electrode assembly is in a stack structure.

[0093] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided respectively and are alternately stacked.

[0094] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments which are stacked.

[0095] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments which are stacked.

[0096] As an example, a plurality of separators can be provided, and each of the separators is provided between any adjacent positive electrode sheet or negative electrode sheet.

[0097] As an example, the separators can be provided continuously and are provided between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0098] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0099] In some embodiments, the electrode assembly is provided with tabs. The tabs can lead current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0100] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0101] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square battery cell, a blade battery cell, and a polygonal battery cell, such as a hexagonal battery cell, etc.

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

[0103] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0104] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0105] In some embodiments, the battery apparatus can be a battery pack including a box and one or more battery cell assemblies accommodated in the box.

[0106] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0107] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0108] In some embodiments, the box can be part of the chassis structure of the vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0109] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0110] Hereinafter, the embodiments described below will mainly be described with respect to cuboid battery cells. It should be understood that the embodiments described below are also applicable to cylindrical battery cells or soft-pack battery cells or blade battery cells in some aspects.

[0111] The development of battery technology needs to consider various design factors, such as performance parameters such as energy density, cycle life, discharge capacity, and charge-discharge rate, and in addition, the reliability of the battery apparatus needs to be considered.

[0112] When the battery device is in operation, if the heat exchange between the battery cell assembly and the external environment is too fast, the temperature of the battery cell assembly is easily affected by the air temperature. If the battery device cannot operate at its suitable temperature, its reliability will be poor. For example, in a low-temperature environment, the battery cell is prone to polarization, thereby reducing its discharge capacity. Taking a lithium ion battery as an example, when the temperature is too low, the lithium intercalation speed of graphite is reduced, and metallic lithium is easily deposited on the negative electrode surface. If the time left after charging is insufficient before use, the metallic lithium cannot be fully re-intercalated into the graphite, and part of the metallic lithium remains on the surface of the negative electrode, which has a high risk of forming lithium dendrites. Moreover, when the temperature is too low, the viscosity of the electrolyte will increase, and the lithium ion migration impedance will also increase, which will reduce the reliability of the battery device.

[0113] In order to improve the reliability of the battery device, the battery device usually adds thermal insulation materials on the outer periphery and inside of the box, but the thermal insulation materials have a high risk of deformation and failure under stress, and the reliability of the battery device is poor. In addition, the thermal insulation materials attached to the outside or inside of the box can also reduce the energy density of the battery device.

[0114] In view of this, the present application provides a battery device, which comprises a battery cell assembly and a box. The box comprises an inner frame, an outer frame, a support plate and a connecting component. The inner frame is arranged in the outer frame, and the outer periphery of the inner frame is arranged in a spaced manner with the inner periphery of the outer frame. The connecting component connects the inner frame and the outer frame. The support plate is connected with the inner frame and forms a first compartment for accommodating the battery cell assembly. The support plate bears the battery cell assembly, and the support plate is arranged in a spaced manner with the outer frame. The support plate is connected with the inner frame to jointly enclose a first compartment for accommodating the battery cell assembly, wherein the support plate directly bears the load of the battery cell assembly. This structure sets a gap between the outer periphery of the inner frame and the inner periphery of the outer frame, and sets a gap between the support plate and the outer frame, thereby constructing a double thermal insulation barrier. When the heat generated by the battery cell assembly is transferred to the outside of the box, the heat conduction path needs to pass through the gap area between the inner frame and the outer frame and the gap area between the support plate and the outer frame in sequence, and the two air layers effectively block the formation of the heat bridge. This hierarchical thermal insulation design is conducive to stabilizing the working temperature of the battery cell assembly within the optimal working condition range, thereby improving the reliability of the battery device.

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

[0116] The electric device includes but is not limited to: electric vehicles, electric vehicles, ships and spacecraft, etc., for example, the spacecraft includes airplanes, rockets, space shuttles and spacecraft, etc.

[0117] The following embodiments are described by taking a vehicle as an example for convenience of description.

[0118] For example, Figure 1 A structural schematic diagram of a vehicle 1000 of some embodiments of the present application, the vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile or a range extended automobile, etc. The vehicle 1000 can be provided with a motor 300, a controller 200 and a battery device 100 inside, the controller 200 is used to control the power supply of the battery device 100 to the motor 300. For example, the battery device 100 can be arranged at the bottom or the front or the rear of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power source of the vehicle 1000, for example, for the circuit system of the vehicle 1000, for example, for the power demand of the vehicle 1000 during starting, navigation and running. In another embodiment of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0119] In order to meet different power demand, the battery device 100 can include a plurality of battery monomers 12, wherein the plurality of battery monomers 12 can be connected in series or in parallel or in mixed connection, and the mixed connection refers to the mixture of series connection and parallel connection. The battery device 100 can also be referred to as a battery pack. Optionally, the plurality of battery monomers 12 can be connected in series or in parallel or in mixed connection to form a battery monomer assembly 101, and the plurality of battery monomer assemblies 101 are connected in series or in parallel or in mixed connection to form the battery device 100. That is, the plurality of battery monomers 12 can be directly connected to form the battery device 100, or the plurality of battery monomers 12 can be connected to form the battery monomer assembly 101 first, and then the battery monomer assembly 101 is connected to form the battery device 100.

[0120] For example, please refer to Figure 2 , Figure 2 An exploded view of the battery device 100 of some embodiments of the present application, the battery device 100 can include a plurality of battery monomers 12. The battery device 100 can also include a box 11, the inside of the box 11 is a hollow structure, and the plurality of battery monomers 12 are contained in the box 11. As shown in Figure 2As shown, a first case 111 and a second case 112, which are respectively referred to as the first case 111 and the second case 112 here, are buckled together. The shapes of the first case 111 and the second case 112 can be determined according to the shape of the combination of the plurality of battery cells 12, and the first case 111 and the second case 112 can each have one open face. For example, the first case 111 and the second case 112 can each be a hollow cuboid and have only one face as an open face. The open face of the first case 111 and the open face of the second case 112 are arranged opposite to each other, and the first case 111 and the second case 112 are buckled to each other to form a case 11 having a closed cavity. The plurality of battery cells 12 combined in parallel, in series, or in a mixed combination are placed in the case 11 formed by buckling the first case 111 and the second case 112.

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

[0122] According to different power requirements, the number of battery cells 12 can be set to any value. The plurality of battery cells 12 can be connected in series, in parallel, or in a mixed combination to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery device 100 can be large, in order to facilitate installation, the battery cells 12 can be arranged in groups, and each group of battery cells 12 forms a battery cell assembly 101. The number of battery cells 12 included in the battery cell assembly 101 is not limited and can be set according to requirements. The battery device 100 can include a plurality of battery cell assemblies 101, and these battery cell assemblies 101 can be connected in series, in parallel, or in a mixed combination.

[0123] Please refer to Figure 3 As shown, Figure 3For the exploded view of the battery cell 12 of some embodiments of the present application, the battery cell 12 includes one or more electrode assemblies 122 and a housing 121. The housing 121 can include a shell 1212, and the plurality of walls of the shell 1212, i.e., the plurality of walls of the housing 121, enclose a cavity which can be used to accommodate the electrode assembly 122. The shell 1212 is determined according to the shape of the combination of the one or more electrode assemblies 122, for example, the shell 1212 can be a hollow cuboid or a square or a regular polyhedron, and one of the faces of the shell 1212 has an opening so that the one or more electrode assemblies 122 can be placed in the shell 1212. The shell 1212 is filled with an electrolyte, such as an electrolyte solution.

[0124] The battery cell 12 can also include two electrode terminals 123, which can be provided on an end cover 1211. The end cover 1211 is generally flat, and the two electrode terminals 123 are fixed on the flat face of the end cover 1211, and the two electrode terminals 123 are respectively a positive electrode terminal 123 and a negative electrode terminal 123. Each electrode terminal 123 is respectively provided with a jumper 124 located between the end cover 1211 and the electrode assembly 122, for electrically connecting the electrode assembly 122 and the electrode terminal 123. In the battery cell 12, the electrode assembly 122 can be provided as a single or multiple according to actual use requirements, and the battery cell 12 is provided with multiple independent electrode assemblies 122.

[0125] According to some embodiments of the present application, please refer to Figures 4-8 , the battery device 100 includes a battery cell assembly 101 and a box 11, the box 11 includes an inner frame 118, an outer frame 114, a support plate 119 and a connecting component 117, the inner frame 118 is arranged in the outer frame 114, the outer periphery of the inner frame 118 is arranged in the inner periphery of the outer frame 114, the connecting component 117 connects the inner frame 118 and the outer frame 114, the support plate 119 is connected with the inner frame 118 and forms a first compartment 115 for accommodating the battery cell assembly 101, the support plate 119 bears the battery cell assembly 101, and the support plate 119 is arranged in the outer frame 114.

[0126] In some embodiments, the battery cell assembly 101 includes an end plate 1011 and a plurality of battery cells 12, the end plate 1011 is used to limit the position of the plurality of battery cells 12 in a direction, for example, the plurality of battery cells 12 are arranged in a first direction X, and the end plate 1011 is provided with two, the two end plates 1011 are arranged in the first direction X, and the plurality of battery cells 12 are located between the two end plates 1011.

[0127] In some embodiments, the battery cell assembly 101 comprises a plurality of battery cells 12, the box 11 comprises two limiters 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, the two limiters are arranged along the first direction X at intervals, and the plurality of battery cells 12 are located between the two limiters. The limiters can be expansion beams.

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

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

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

[0131] In some embodiments, the outer frame 114 can be a profiled outer frame.

[0132] In some embodiments, the outer frame 114 can be a bent sheet metal part.

[0133] In some embodiments, the outer frame 114 can be an integrally formed frame structure. In other embodiments, the outer frame 114 can be formed by welding multiple edge beams.

[0134] In some embodiments, the inner frame 118 can include multiple sections of beam bodies integrally formed. For example, please refer to Figure 4 The inner frame 118 is a rectangular frame body.

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

[0136] In some embodiments, the inner frame 118 can be a profiled inner frame.

[0137] In some embodiments, the inner frame 118 can be a bent sheet metal part.

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

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

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

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

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

[0143] In some embodiments, the connecting component 117 can connect the inner frame 118 and the outer frame 114 by welding.

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

[0145] The outer periphery of the inner frame 118 is spaced apart from the inner periphery of the outer frame 114, which means that a gap is provided between the outer periphery of the inner frame 118 and the inner periphery of the outer frame 114. The air layer in the gap can have a heat insulation effect and block the formation of a heat bridge. The support plate 119 is spaced apart from the outer frame 114, which means that a gap is provided between the support plate 119 and the outer frame 114. The air layer in the gap can have a heat insulation effect and block the formation of a heat bridge. In other words, the existence of the gap can reduce the heat exchange speed between the battery monomer assembly 101 and the external environment. The heat preservation performance of the battery device 100 is improved. The possibility of the temperature of the battery monomer assembly 101 being excessively affected by the air temperature is reduced.

[0146] By spacing the outer periphery of the inner frame 118 from the inner periphery of the outer frame 114 and spacing the support plate 119 from the outer frame 114, the heat preservation performance of the battery device 100 can be passively improved. In some embodiments, the same accommodation space can be equipped with different numbers of battery monomers 12 under the premise of meeting the battery replacement demand, and the battery device 100 can have some idle space. By forming a heat preservation layer with part of the idle space, the heat preservation performance of the battery device 100 can be improved without adding too much heat insulation material.

[0147] In the technical solution of the embodiment of the application, the support plate 119 is connected with the inner frame 118 to jointly enclose the first bin 115 for accommodating the battery monomer assembly 101, wherein the support plate 119 directly bears the load bearing function of the battery monomer assembly 101. The structure sets a gap between the outer circumferential side of the inner frame 118 and the inner circumferential side of the outer frame 114, and sets a gap between the support plate 119 and the outer frame 114, thereby constructing a double heat insulation barrier. When the heat generated by the battery monomer assembly 101 is transmitted to the outside of the box body 11, the heat conduction path thereof needs to pass through the gap area between the inner frame 118 and the outer frame 114 and the gap area between the support plate 119 and the outer frame 114 in sequence, and the two air layers effectively block the formation of the heat bridge. The hierarchical heat insulation design is conducive to stabilizing the working temperature of the battery monomer assembly 101 within the optimal working condition range, thereby improving the reliability of the battery device 100.

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

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

[0150] In some embodiments, the bottom plate 113 includes a first plate body and a second plate body arranged in layers, one of the first plate body and the second plate body has a groove, and the other of the first plate body and the second plate body jointly defines the flow channel 1191 with the groove.

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

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

[0153] In the above scheme, the support plate 119 has dual functions of structural bearing and heat management in the battery device 100, which can make the layout of the battery device 100 more compact, thereby improving the overall energy density. In addition, the gap between the support plate 119 and the outer frame 114 forms an air layer, which can effectively reduce the interference of the external environment temperature of the box body 11 on the heat exchange medium, so that the heat exchange medium has a higher heat exchange efficiency.

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

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

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

[0157] In the above scheme, by setting the thickness direction Z of the support plate as the assembly positioning reference, the assembly accuracy of the support plate 119 and the outer frame 114 can be improved, so that the setting gap between the two can be accurately controlled, which is beneficial to the heat conduction efficiency of the battery device 100. In addition, such a design is also beneficial to the automated production of the battery device 100.

[0158] According to some embodiments of the present application, please refer to Figures 4-8 The inner frame 118 includes two first internal beams 1181 and two second internal beams 1182, the two first internal beams 1181 are arranged at intervals along the first direction X, and the two second internal beams 1182 are arranged at intervals along the second direction Y. The first internal beam 1181 connects the two second internal beams 1182, and the second direction Y, the first direction X and the thickness direction Z of the support plate are perpendicular to each other.

[0159] In some embodiments, the first internal beam 1181 can include multiple segments, and the multiple segments of the first internal beam 1181 are arranged at intervals along the second direction Y.

[0160] In some embodiments, the second internal beam 1182 can include multiple segments, and the multiple segments of the second internal beam 1182 are arranged at intervals along the first direction X.

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

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

[0163] According to some embodiments of the present application, please refer to Figures 4-8 The outer frame 114 includes two first side beams 11411 and two second side beams 11412, the two first side beams 11411 are arranged at intervals along the first direction X, and the two second side beams 11412 are arranged at intervals along the second direction Y. Along the first direction X, the first internal beam 1181 is arranged at intervals with the first side beam 11411; along the second direction Y, the second internal beam 1182 is arranged at intervals with the second side beam 11412.

[0164] In the first direction X, the first inner beam 1181 is spaced apart from the first edge beam 11411, meaning that there is a gap between the first inner beam 1181 and the first edge beam 11411, in other words, an air layer is formed between the first inner beam 1181 and the first edge beam 11411.

[0165] In the second direction Y, the second inner beam 1182 is spaced apart from the second edge beam 11412, meaning that there is a gap between the second inner beam 1182 and the second edge beam 11412, in other words, an air layer is formed between the second inner beam 1182 and the second edge beam 11412.

[0166] In the above scheme, the gap between the first inner beam 1181 and the first edge beam 11411, and the gap between the second inner beam 1182 and the second edge beam 11412, effectively block the formation of thermal bridges, which is conducive to stabilizing the working temperature of the battery monomer assembly 101 within the optimal working condition range, and improves the reliability of the battery device 100.

[0167] According to some embodiments of the present application, please refer to Figure 5 and Figures 8-11 The battery monomer assembly 101 includes a plurality of battery monomers 12 stacked in the first direction X. The battery device 100 further includes a heat insulation pad 120, which is arranged at least one end of the battery monomer assembly 101 in the first direction X.

[0168] The plurality of battery monomers 12 includes at least one group of battery monomers 12, and each group of battery monomers 12 includes a plurality of battery monomers 12 stacked in the first direction X. In the embodiment in which the battery monomer assembly 101 includes two end plates 1011, two groups of battery monomers 12 can be included between the two end plates 1011 in the first direction X, the two groups of battery monomers 12 are arranged in the second direction Y, and the two groups of battery monomers 12 share the two end plates 1011. Of course, only one group of battery monomers 12 can be included between the two end plates 1011.

[0169] The material of the heat insulation pad 120 includes but is not limited to polyethylene film, polyimide film, silicone rubber, glass fiber cloth, aerogel, ceramic fiber, foam, mica, fiber reinforced composite material, etc.

[0170] In some embodiments, the battery monomer assembly 101 includes end plates 1011 and a plurality of battery monomers 12, the end plates 1011 are provided in two, the two end plates 1011 are spaced apart in the first direction X, the plurality of battery monomers 12 are located between the two end plates 1011, and the heat insulation pad 120 is arranged on the side of the end plate 1011 away from the battery monomer 12 in the first direction X.

[0171] In some embodiments, the inner frame 118 includes two first inner beams 1181 and two second inner beams 1182, the two first inner beams 1181 are arranged at intervals along the first direction X, the two second inner beams 1182 are arranged at intervals along the second direction Y, two ends of the first inner beam 1181 are connected to the two second inner beams 1182 respectively, and two ends of the second inner beam 1182 are connected to the two first side beams 11411 respectively. The thermal insulation pad 120 is provided in plurality, and at least one thermal insulation pad 120 is arranged between the battery monomer assembly 101 and the first inner beam 1181 along the first direction X.

[0172] In some embodiments, the box body 11 further includes a partition beam 125, the partition beam 125 divides the first bin 115 into a plurality of first sub-bins 1151, the battery monomer assembly 101 is provided in plurality, the plurality of battery monomer assemblies 101 correspond to the plurality of first sub-bins 1151 one by one, and each battery monomer assembly 101 is arranged in the first sub-bin 1151 corresponding thereto. The partition beam 125 is provided in plurality, the plurality of partition beams 125 include a first sub-partition beam 1251 and a second sub-partition beam 1252, the first sub-partition beam 1251 extends along the second direction Y, the second sub-partition beam 1252 extends along the first direction X, and the second direction Y, the first direction X and the thickness direction Z of the support plate are perpendicular to each other. The thermal insulation pad 120 is provided in plurality, and at least one thermal insulation pad 120 is arranged between the battery monomer assembly 101 and the first sub-partition beam 1251 along the first direction X.

[0173] In the above scheme, in the path of the heat of the battery monomer assembly 101 transferred to the outside of the box body 11 in the first direction X, the arrangement of the thermal insulation pad 120 can reduce the heat loss of the battery monomer assembly 101, and further improve the heat preservation performance of the battery device 100.

[0174] According to some embodiments of the present application, please refer to Figure 5 and Figures 8-11 The thermal insulation pad 120 is internally provided with a cavity 1201.

[0175] In some embodiments, the cavity 1201 can be formed at one time during the molding of the thermal insulation pad 120, for example, by injection molding or the like.

[0176] In some embodiments, the cavity 1201 can be formed at two times after the molding of the thermal insulation pad 120, for example, by machining or the like.

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

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

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

[0180] In the above scheme, since the thermal conductivity of the heat insulation pad 120 is less than the thermal conductivity of the inner frame 118, the heat exchange difficulty between the battery monomer assembly 101 and the inner frame 118 is increased, thereby further reducing the risk of excessive heat of the battery monomer assembly 101 being lost to the outside of the box body 11 through the inner frame 118 and the frame, and improving the heat preservation performance of the battery device 100.

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

[0182] The material of the heat insulation pad 120 includes but is not limited to a fiber-reinforced concrete and the like.

[0183] The material of the inner frame 118 includes but is not limited to steel, aluminum, aluminum alloy and the like.

[0184] In the above scheme, while improving the heat preservation performance of the battery device 100, the heat insulation pad 120 including the fiber-reinforced composite material and the inner frame 118 including the metal can improve the structural strength of the box body 11.

[0185] According to some embodiments of the present application, please refer to Figures 5-8 The box body 11 further includes a partition beam 125, the partition beam 125 divides the first compartment 115 into a plurality of first sub-compartments 1151, the battery monomer assembly 101 is provided in plurality, the plurality of battery monomer assemblies 101 correspond to the plurality of first sub-compartments 1151 one by one, and each battery monomer assembly 101 is arranged in the first sub-compartment 1151 corresponding thereto.

[0186] In some embodiments, the partition beam 125 can include a plurality of sub-partition beams 125 which are integrally formed.

[0187] The shape of the partition beam 125 can include but is not limited to a polygon, a circle, a convex polygon, an irregular polygon and the like.

[0188] In some embodiments, the partition beam 125 can be a profiled partition beam.

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

[0190] In the above scheme, the first sub-tank 1151 can serve as an assembly reference of the battery monomer assembly 101 corresponding thereto, which is conducive to reducing the assembly difficulty of the battery device 100 and improving the assembly efficiency of the battery device 100.

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

[0192] The first sub-partition 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-partition beam 1251, the length direction of the orthographic projection of the first sub-partition beam 1251 is the second direction Y.

[0193] The second sub-partition 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-partition beam 1252, the length direction of the orthographic projection of the second sub-partition beam 1252 is the first direction X.

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

[0195] According to some embodiments of the present application, please refer to Figures 5-8 The plurality of connecting components 117 are arranged along the circumference of the inner frame 118.

[0196] The plurality of connecting components 117 are arranged along the circumference of the inner frame 118, which means that when the box body 11 is subjected to external force, the plurality of regions along the circumference of the inner frame 118 can disperse the external force through the connecting components 117, so that the inner frame 118 has higher structural stability.

[0197] In the above scheme, the plurality of connecting components 117 can improve the connection stability of the inner frame 118. In addition, since the plurality of connecting components 117 are arranged along the circumference of the inner frame 118, the external force can be dispersed more effectively, the risk of local stress concentration is reduced, and the reliability of the box body 11 is improved.

[0198] According to some embodiments of the present application, please refer to Figures 5-8The connecting component 117 is provided in plurality, and the plurality of connecting components 117 includes a first connecting component 1171 which is integrally formed with the inner frame 118; and / or the plurality of connecting components 117 includes a second connecting component 1172 which is integrally formed with the inner frame 118.

[0199] In some embodiments, the first connecting component 1171 is integrally formed with the first internal beam 1181, and the second connecting component 1172 is integrally formed with the second internal beam 1182. The first connecting component 1171 and the first internal beam 1181 can be formed by machining a beam body, and the second connecting component 1172 and the second internal beam 1182 can be formed by machining a beam body. Taking the first connecting component 1171 and the first internal beam 1181 as an example, after machining a beam body, a notch can be formed on the beam body, which separates the beam body into the first connecting component 1171 and the first internal beam 1181. The notch is used for plug-in cooperation with the beam body where the second internal beam 1182 is located.

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

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

[0202] Compared with the connection between the connecting component 117 and the inner frame 118 by welding or fastener connection, the risk of weld failure or fastener torque failure between the integrally formed connecting component 117 and the inner frame 118 is lower. The risk of connection failure due to the existence of a weak area between the connecting component 117 and the inner frame 118 is lower.

[0203] In the above scheme, the connecting component 117 and the inner frame 118 are processed by integrally forming, which can simplify the assembly process of the battery device 100, and can reduce the risk of connection failure due to the existence of a weak area between the connecting component 117 and the inner frame 118.

[0204] According to some embodiments of the present application, please refer to Figures 5-8 The connecting component 117 is provided in plurality, and the plurality of connecting components 117 includes a third connecting component 1173 which is separately formed with the inner frame 118.

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

[0206] In the above scheme, the third connecting component 1173 is formed separately from the inner frame 118, which improves the connection stability of the inner frame 118, and at the same time, the battery device 100 has a lower cost, and the maintenance convenience of the box body 11 is improved.

[0207] According to some embodiments of the present application, please refer to Figures 5-8 The box body 11 further includes a bottom plate 113 connected to the outer frame 114, and the bottom plate 113 is located on the side of the support plate 119 away from the battery monomer assembly 101 along the thickness direction Z of the support plate.

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

[0209] In some embodiments, the support plate 119 is in contact with the bottom plate 113.

[0210] In some embodiments, the bottom plate 113 has a cavity formed inside, and the existence of the cavity can improve the heat preservation performance of the bottom plate 113.

[0211] In some embodiments, the material of the bottom plate 113 can include metal, such as steel, aluminum, aluminum alloy, etc.

[0212] In some embodiments, the material of the bottom plate 113 can include fiber reinforced composite material, etc.

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

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

[0215] In the above scheme, the support plate 119 is arranged between the outer frame 114 to improve the heat preservation performance of the battery device 100, and at the same time, the arrangement of the bottom plate 113 can reduce the risk of foreign matter entering the box body 11 and damaging the battery monomer 12, and improve the reliability of the battery device 100.

[0216] According to some embodiments of the present application, please refer to Figures 5-8 The support plate 119 is arranged between the bottom plate 113 along the thickness direction Z of the support plate.

[0217] The support plate 119 is arranged between the bottom plate 113 along the thickness direction of the bottom plate 113, which means that there is a gap area in the path of the heat of the battery monomer assembly 101 transmitted to the outside of the box body 11 via the support plate 119 and the bottom plate 113.

[0218] In some embodiments, the support plate 119 is spaced apart from the bottom plate 113 along the thickness direction Z of the support plate, that is, there is a region where the support plate 119 and the bottom plate 113 are not in contact with each other along the thickness direction Z of the support plate.

[0219] In the above scheme, since the support plate 119 is spaced apart from the bottom plate 113 along the thickness direction Z of the support plate, there is a gap between the support plate 119 and the bottom plate 113. When the heat generated by the battery monomer assembly 101 is transmitted out of the box body 11, the heat conduction path thereof needs to pass through the gap region between the support plate 119 and the bottom plate 113 in turn, and the air layer in the gap region effectively blocks the formation of a heat bridge, which can further improve the heat preservation performance of the battery device 100 and improve the reliability of the battery device 100.

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

[0221] The heat insulation material includes but is not limited to polyethylene film, polyimide film, silicone rubber, glass fiber cloth, aerogel, ceramic fiber, foam material, mica material, etc.

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

[0223] According to some embodiments of the present application, please refer to Figure 12 and Figures 5-8 , the outer frame 114 includes a first outer frame 1141 and a second outer frame 1142, the inner frame 118 is arranged in the first outer frame 1141, and the outer circumferential side of the inner frame 118 is spaced apart from the inner circumferential side of the first outer frame 1141; the second outer frame 1142 is arranged outside the first outer frame 1141, and the second outer frame 1142 is connected to the first outer frame 1141 and encloses the bottom plate 113 to form the second compartment 116; wherein the battery device 100 further includes an electric control module 126, and the electric control module 126 is arranged in the second compartment 116.

[0224] In some embodiments, the electric control module 126 is accommodated in a single box body, for example, a high-voltage box is arranged on the bottom plate 113, and the electric control module 126 is arranged in the high-voltage box.

[0225] In some embodiments, the electric control module 126 can include but is not limited to sensors, fuses, relays and other components. In some other embodiments, each part of the electric control module 126 can be directly arranged in the second compartment 116, for example, the sensors, fuses, relays and other components can be dispersedly assembled on the bottom plate 113 in the second compartment 116 or on the mounting bracket in the second compartment 116.

[0226] The outer circumferential side of the inner frame 118 is arranged in a spaced manner with the inner circumferential side of the first outer frame 1141, meaning that in the heat transfer path, the thermal bridge between the battery monomer assembly 101 and the electric control module 126 is interrupted by an air layer. This is conducive to more accurately controlling the temperature between the first compartment 115 and the second compartment 116, so that the electric control module 126 and the battery monomer assembly 101 can both work in a suitable temperature range.

[0227] In the above scheme, due to the spaced arrangement of the outer circumferential side of the inner frame 118 and the inner circumferential side of the first outer frame 1141, there is a gap between the inner frame 118 and the first outer frame 1141. When the heat generated by the battery monomer assembly 101 is transferred to the second compartment 116, its heat conduction path needs to pass through the gap area between the inner frame 118 and the first outer frame 1141 in turn. The air layer in the gap area effectively blocks the formation of a thermal bridge, which can improve the reliability of the electric control module 126.

[0228] According to some embodiments of the present application, please refer to Figure 12 and Figure 5 , the first compartment 115 and the second compartment 116 are arranged in a spaced manner along the first direction X, and the battery device 100 further comprises a battery management unit 127, which is arranged between the first compartment 115 and the second compartment 116 along the first direction X.

[0229] In some embodiments, please refer to Figure 12 , the outer frame 114 comprises two first edge beams 11411 and two second edge beams 11412, the two first edge beams 11411 are arranged in a spaced manner along the first direction X, and the two second edge beams 11412 are arranged in a spaced manner 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 further comprises two third edge beams 11421 and a fourth edge beam 11422, the two third edge beams 11421 are arranged in a spaced manner along the second direction Y, and the fourth edge beam 11422 extends along the second direction Y, the two ends of the fourth edge beam 11422 are respectively connected to the first ends of the two third edge beams 11421, and the second ends of the third edge beams 11421 are connected to one of the first edge beams 11411. The first edge beam 11411 connected to the third edge beam 11421 is located between the fourth edge beam 11422 and the other third edge beam 11421 along the first direction X, and the two third edge beams 11421, the fourth edge beam 11422, the first edge beam 11411 connected to the third edge beam 11421 and the bottom plate 113 together define the second compartment 116. In other embodiments, please refer to Figure 6 , the first edge beam 11411 connected to the third edge beam 11421 is provided with a communication port 1145 penetrating along the first direction X, which can be used for the wire harness to pass through. Please refer to Figure 1In some embodiments, the battery management unit 127 is located between the first edge beam 11411 connected with the third edge beam 11421 and the first inner beam 1181 close to the first edge beam 11411 along the first direction X.

[0230] In some embodiments, the battery management unit 127 is used to manage the battery cell 12, for example, the battery management unit 127 can detect the voltage, current, temperature and other parameters of the battery cell 12, and can also adjust the charging and discharging state of the battery cell 12, and can also integrate overvoltage protection, overcurrent protection, short circuit protection, temperature protection and other functions, and can also record the historical data of the battery cell 12, such as the number of charging times, temperature curve, etc., and of course can also communicate with the power consumption device, etc.

[0231] In the above scheme, the gap between the first bin 115 and the second bin 116 can not only improve the heat preservation performance of the battery device 100, but also accommodate the battery management unit 127, so that the structure of the battery device 100 is more compact, and the energy density of the battery device 100 is improved.

[0232] According to some embodiments of the present application, please refer to Figures 5-12 The present application provides a power consumption device, which comprises the battery device 100 in one or more embodiments described above, and the battery device 100 is used to provide electric energy.

[0233] In the above scheme, since the battery device 100 in one or more embodiments described above has high reliability, the power consumption device comprising the battery device 100 in one or more embodiments described above also has high reliability.

[0234] According to some embodiments of the present application, please refer to ​The battery device 100 includes a battery cell assembly 101 and a case 11. The case 11 includes a bottom plate 113, a support plate 119, an outer frame 114, an inner frame 118, and a connecting component 117. The outer frame 114 is connected to the bottom plate 113 and encloses the bottom plate 113 to form a receiving space. In the thickness direction Z of the support plate, the bottom plate 113 is located on the side of the support plate 119 away from the battery cell assembly 101. The receiving space has an opening. The case 11 further includes a case cover arranged opposite to the bottom plate 113 in the thickness direction of the bottom plate 113, and the case cover closes the opening. The receiving space includes a first compartment 115 and a second compartment 116. The support plate 119 and the inner frame 118 form the first compartment 115. The outer frame 114 includes a first outer frame 1141 and a second outer frame 1142. The inner frame 118 is arranged in the first outer frame 1141, and the outer periphery of the inner frame 118 is arranged apart from the inner periphery of the first outer frame 1141. The second outer frame 1142 is arranged outside the first outer frame 1141, and the second outer frame 1142 is connected to the first outer frame 1141 and encloses the bottom plate 113 to form the second compartment 116. The battery device 100 includes an electronic control module 126 arranged in the second compartment 116, and the battery cell assembly 101 is arranged in the first compartment 115. The first compartment 115 and the second compartment 116 are arranged apart in a first direction X. In the first direction X, the battery management unit 127 of the battery device 100 is arranged between the first compartment 115 and the second compartment 116.

[0235] The support plate 119 bears the battery cell assembly 101, and the inside of the support plate 119 is formed with a flow channel 1191 for accommodating a heat exchange medium. The connecting component 117 connects the inner frame 118 and the outer frame 114. The outer periphery of the inner frame 118 is arranged apart from the inner periphery of the outer frame 114, and the support plate 119 is arranged apart from the outer frame 114. In the thickness direction Z of the support plate, the support plate 119 is arranged apart from the bottom plate 113.

[0236] The inner frame 118 comprises two first internal beams 1181 and two second internal beams 1182, the two first internal beams 1181 are arranged at intervals along the first direction X, the two second internal beams 1182 are arranged at intervals along the 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 outer frame 114 comprises two first side beams 11411 and two second side beams 11412, the two first side beams 11411 are arranged at intervals along the first direction X, and the two second side beams 11412 are arranged at intervals along the second direction Y. Along the first direction X, the first internal beams 1181 are arranged at intervals with the first side beams 11411; along the second direction Y, the second internal beams 1182 are arranged at intervals with the second side beams 11412. The box body 11 further comprises a partition beam 125, the partition beam 125 divides the first bin 115 into a plurality of first sub-bins 1151, and the battery monomer assembly 101 is provided with a plurality of battery monomer assemblies 101, a plurality of battery monomer assemblies 101 correspond to a plurality of first sub-bins 1151 one by one, and each battery monomer assembly 101 is arranged in the first sub-bin 1151 corresponding thereto. The partition beam 125 is provided with a plurality of partition beams 125, and the plurality of partition beams 125 comprise a first sub-partition beam 1251 and a second sub-partition beam 1252, the first sub-partition beam 1251 extends along the second direction Y, the second sub-partition beam 1252 extends along the first direction X, and the second direction Y, the first direction X and the thickness direction Z of the support plate are perpendicular to each other.

[0237] The connecting component 117 is provided with a plurality of connecting components 117, and the plurality of connecting components 117 are arranged at intervals along the circumference of the inner frame 118. The connecting component 117 is provided with a plurality of connecting components 117, and the plurality of connecting components 117 comprise 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 formed separately from the inner frame 118.

[0238] The battery monomer assembly 101 comprises a plurality of battery monomers 12 stacked along the first direction X. The heat insulation pad 120 is arranged at least one end of the battery monomer assembly 101 along the first direction X. The heat insulation pad 120 is internally provided with a cavity 1201.

[0239] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present 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 body comprising an inner frame, an outer frame, a support plate and a connecting component, the inner frame is arranged in the outer frame, the outer periphery of the inner frame is arranged apart from the inner periphery of the outer frame, the connecting component connects the inner frame and the outer frame, the support plate is connected with the inner frame and forms a first compartment for accommodating the battery cell assembly, the support plate carries the battery cell assembly, and the support plate is arranged apart from the outer frame.

2. The battery device according to claim 1, characterized by An inner part of the support plate is formed with a flow channel for accommodating a heat exchange medium.

3. The battery device of claim 1, wherein In the same projection plane perpendicular to the thickness direction of the support plate, the outer edge of the orthographic projection of the support plate is arranged apart from the inner edge of the orthographic projection of the outer frame.

4. The battery device according to claim 1, wherein the inner frame comprises two first internal beams and two second internal beams, the two first internal beams are arranged apart along a first direction, and the two second internal beams are arranged 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.

5. The battery device of claim 4, wherein, the outer frame comprises two first edge beams and two second edge beams, the two first edge beams are arranged apart along a first direction, and the two second edge beams are arranged apart along a second direction; along the first direction, the first internal beams are arranged apart from the first edge beams; along the second direction, the second internal beams are arranged apart from the second edge beams.

6. The battery device of claim 1, wherein The battery cell assembly comprises a plurality of battery cells stacked along a first direction; The battery device further comprises a thermal insulation pad arranged at at least one end of the battery cell assembly along the first direction.

7. The battery device of claim 6, wherein The thermal insulation pad is internally provided with a cavity.

8. The battery device of claim 6, wherein, The thermal conductivity of the thermal insulation pad is less than that of the inner frame.

9. The battery device of claim 8, wherein, The material of the thermal insulation pad comprises a fiber-reinforced composite material, and the material of the inner frame comprises a metal.

10. The battery device of claim 1, wherein The box body further comprises a partition beam, the partition beam divides the first compartment into a plurality of first sub-compartments, the battery cell assembly is provided in plurality, the plurality of battery cell assemblies correspond to the plurality of first sub-compartments one by one, and each battery cell assembly is arranged in the corresponding first sub-compartment.

11. The battery device of claim 10, wherein, The partition beam is provided in plurality, the plurality of partition beams comprise first sub-partition beams and second sub-partition beams, the first sub-partition beams extend along a second direction, the second sub-partition beams extend along a first direction, and the second direction, the first direction and the thickness direction of the support plate are perpendicular to each other.

12. The battery device of claim 1, wherein, The connecting component is provided in plurality, and the plurality of connecting components are arranged apart along the circumference of the inner frame.

13. The battery device of claim 12, wherein, The connecting component is provided in plurality, and the plurality of connecting components comprise first connecting components which are integrally formed with the inner frame; and / or, the plurality of connecting components comprise second connecting components which are integrally formed with the inner frame.

14. The battery device of claim 12, wherein, The connecting component is provided in plurality, and the plurality of connecting components comprise third connecting components which are separately formed with the inner frame.

15. The battery device of claim 1, wherein, The box further includes a bottom plate connected to the outer frame, the bottom plate being located on a side of the support plate away from the battery cell assembly in a thickness direction of the support plate. 16.The battery device of claim 15, wherein, The support plate is spaced apart from the bottom plate in a thickness direction of the support plate.

17. The battery device of claim 15, wherein, A thermal insulation material is provided between the support plate and the bottom plate.

18. The battery device of claim 15, wherein, The outer frame includes: a first outer frame, the inner frame being provided in the first outer frame, an outer periphery side of the inner frame being spaced apart from an inner periphery side of the first outer frame; a second outer frame, the second outer frame being provided outside the first outer frame, the second outer frame being connected to the first outer frame and enclosing the bottom plate to form a second compartment; The battery device further includes an electronic control module, the electronic control module being provided in the second compartment.

19. The battery device of claim 18, wherein, The first compartment and the second compartment are spaced apart in a first direction, the battery device further including a battery management unit, the battery management unit being provided between the first compartment and the second compartment in the first direction.

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

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