Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device. The battery device includes: a battery cell; the box body is used for accommodating the single battery, the box body comprises a first box body part, the first box body part comprises a base plate and a frame, the frame is formed around the base plate through insert injection molding, and mounting holes are formed in the frame. According to the invention, the weight of the battery device is reduced, and the reliability is improved.

Description

TECHNICAL FIELD

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

[0002] With the rapid development of new energy technology, battery devices have been widely applied in the fields of electronic devices, electric vehicles, electric two-wheel vehicles, electric tools, etc. With the more and more extensive application of battery devices, higher requirements are put forward for the lightweight and reliability of battery devices. CONTENT OF THE UTILITY MODEL

[0003] The embodiments of the present application provide a battery device and a power utilization device to improve the lightweight and reliability of the battery device.

[0004] In a first aspect, the embodiments of the present application provide a battery device, comprising: a battery monomer; a box body for accommodating the battery monomer, the box body comprising a first box body component, the first box body component comprising a base plate and a frame, the frame being insert-molded around the base plate, and the frame being provided with a mounting hole.

[0005] The first box body component comprises the base plate and the frame, and the frame is insert-molded around the base plate, and the mounting hole is provided on the frame, i.e. the first box body component is divided into two parts and then insert-molded together, so that the base plate and the frame can be selectively matched with appropriate materials and / or thicknesses, etc. to meet the requirements of lightweight and strength, and since the base plate and the frame are insert-molded, the connection between them is more firm, thereby improving the reliability of the box body.

[0006] In some embodiments, the frame comprises a side wall and a flange portion, the side wall surrounds the base plate and is connected to a circumferential edge of the base plate, the flange portion is connected to an end of the side wall away from the base plate, and the mounting hole is provided on the flange portion.

[0007] The first box body component is insert-molded, which can conveniently form the frame with the side wall and the flange portion, thereby easily meeting the strength requirements of the frame, the connection reliability requirements of the frame and the base plate, and the lightweight requirements of the box body without changing the structure of the box body too much.

[0008] In some embodiments, the frame further comprises a reinforcing rib, the reinforcing rib being connected between the side wall and the flange portion.

[0009] The reinforcing rib strengthens the strength of the frame, thereby improving the reliability of the connection of the first box body component.

[0010] In some embodiments, the circumferential edge of the base plate is formed with a sawtooth portion, and the frame is connected to the sawtooth portion.

[0011] The sawtooth part is formed on the peripheral surface of the substrate, so that the frame can be in full contact with the substrate during the injection molding of the frame, and the connection strength between the substrate and the frame can be enhanced, thereby improving the connection reliability.

[0012] In some embodiments, the substrate includes a first surface and a second surface opposite to each other along a thickness direction of the substrate, and a peripheral surface connecting the first surface and the second surface; the peripheral surface is formed with a groove, and the frame is connected with the peripheral surface, and a part of the frame is embedded in the groove.

[0013] The groove is formed on the peripheral surface of the substrate, and a part of the frame is embedded in the groove, so that the material of the frame in a molten state flows into the groove during the insert injection molding and is embedded in the groove after solidification, thereby forming a reliable connection between the frame and the substrate.

[0014] In some embodiments, the groove includes a groove bottom surface and two groove side surfaces opposite to each other, and the distance between the two groove side surfaces gradually decreases in a direction away from the groove bottom surface.

[0015] In this way, the groove mouth of the groove is tapered, and the space in the groove closer to the groove mouth is narrower, so that the risk of the part of the side wall embedded in the groove being separated from the groove can be reduced, thereby improving the connection firmness of the frame and the substrate.

[0016] In some embodiments, the groove extends along the circumference of the substrate.

[0017] In this way, a part of the frame is embedded in the entire circumference of the substrate, thereby being more firmly connected.

[0018] In some embodiments, the substrate includes a first surface and a second surface opposite to each other along a thickness direction of the substrate, and a peripheral surface connecting the first surface and the second surface; the peripheral surface is formed with a protrusion, and the frame is connected with the peripheral surface, and the protrusion is embedded in the frame.

[0019] The protrusion is formed on the peripheral surface of the substrate, and the protrusion is embedded in the frame, so that the material of the frame in a molten state can wrap the protrusion during the insert injection molding, thereby forming a reliable connection between the frame and the substrate.

[0020] In some embodiments, a plurality of protrusions are provided, and the plurality of protrusions are arranged at intervals along the circumference of the substrate.

[0021] Since the plurality of protrusions are arranged at intervals along the circumference of the substrate, the protrusions are embedded in the frame, thereby forming a reliable connection between the frame and the substrate.

[0022] In some embodiments, the substrate includes a first surface and a second surface opposite along a thickness direction thereof, and a peripheral surface connecting the first surface and the second surface; a roughness of the peripheral surface is greater than a roughness of the first surface and / or the second surface, and the frame is connected with the peripheral surface.

[0023] Since the peripheral surface of the substrate is a connecting interface with the frame, the rougher the roughness of the peripheral surface is, the greater the contact area is, the more sufficient the contact is, and the more firm the connection is. Thus, by the roughness of the peripheral surface being greater than the roughness of the first surface and / or the second surface, the connection reliability can be improved.

[0024] In some embodiments, a thickness of the frame is greater than a thickness of the substrate.

[0025] By the thickness of the frame being greater than the thickness of the substrate, both lightweight and connection strength requirements can be met.

[0026] In some embodiments, a material of the frame and a material of the substrate are different, and a bending strength of the frame is greater than a bending strength of the substrate.

[0027] Since the frame is a connecting component, higher bending resistance is required, and the frame is injection molded by using a material with high bending strength, so that the connection reliability can be improved.

[0028] In some embodiments, the substrate is a molded part or a stamped part.

[0029] The molded part or the stamped part can make the substrate thinner, which is beneficial to lightweight.

[0030] In some embodiments, the substrate and the frame are both fiber-reinforced resin.

[0031] By the substrate and the frame being both fiber-reinforced resin, compared with most metal materials, the strength requirements and lightweight can be met.

[0032] In some embodiments, the substrate is continuous fiber-reinforced resin, and the frame is short fiber-reinforced resin.

[0033] By the substrate being continuous fiber-reinforced resin and the frame being short fiber-reinforced resin, even if a large step is formed between the frame and the substrate in the first box body component, insert injection molding can be realized, the strength requirements can be met while lightweight is met.

[0034] In some embodiments, the substrate is a ceramic plate or a metal plate.

[0035] The ceramic plate has high temperature resistance and corrosion resistance, is not easy to deform at high temperature, and is not easy to be eroded in harsh environment, thereby improving reliability. The metal plate has high strength and can shield electromagnetic interference, thereby improving reliability. The metal plate can be a steel plate, an aluminum plate, an aluminum alloy plate, a titanium alloy plate, etc.

[0036] In some embodiments, the substrate is provided with a fireproof layer on at least one surface thereof in the thickness direction.

[0037] By providing a fireproof layer on the surface of the substrate, certain fire protection can be provided, which helps to reduce the risk of fire when the battery cell fails (such as short circuit or thermal runaway).

[0038] In some embodiments, the box body and the cover body are connected to form a containing space for containing the battery cell, and at least one of the box body and the cover body is the first box component.

[0039] At least one of the box body and the cover body is the first box component, which meets the strength requirement while reducing the weight.

[0040] In some embodiments, the box body and the protection plate are provided, and the protection plate is arranged at the bottom of the box body, and the protection plate is the first box component.

[0041] The protection plate is the first box component, which meets the strength requirement while reducing the weight.

[0042] In a second aspect, the embodiments of the present application also provide a power utilization device, comprising the battery device provided in the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope.

[0044] Figure 1 The structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0045] Figure 2 The structural schematic diagram of a battery device is provided for some embodiments of the present application;

[0046] Figure 3 The exploded schematic diagram of a battery cell is provided for some embodiments of the present application;

[0047] Figure 4 The structural schematic diagram of a cover body is provided for some embodiments of the present application;

[0048] Figure 5 A top view of the cover provided for some embodiments of the present application;

[0049] Figure 6 A cross-sectional view along A-A in the above figure; Figure 4

[0050] Figure 7 A schematic diagram of the substrate structure provided for some embodiments of the present application;

[0051] Figure 8 A schematic diagram of the substrate structure provided for some embodiments of the present application;

[0052] Figure 9 A schematic diagram of the outer circumferential surface of the substrate provided for some embodiments of the present application;

[0053] Figure 10 An exploded schematic diagram of the substrate and the frame portion structure provided for some embodiments of the present application;

[0054] Figure 11 An exploded schematic diagram of the substrate and the frame portion structure provided for some embodiments of the present application;

[0055] Figure 12 A schematic diagram of the connection between the substrate and the frame portion structure provided for some embodiments of the present application;

[0056] Figure 13 A flowchart of the manufacturing method of the box member provided for some embodiments of the present application.

[0057] Icon:

[0058] 1000 - vehicle; 100 - battery device; 200 - controller; 300 - motor; 10 - box; 11 - cover; 12 - box body; 13 - protection plate; 111 - substrate; 112 - frame; 101 - first box member; 111a - sawtooth portion; 111b - groove; 111b-1 - groove bottom surface; 111b-2 - groove side surface; 1111 - first surface; 1112 - second surface; 1113 - outer circumferential surface; 1113a - circumferential edge; 111c - protrusion; 112b - flange portion; 112c - reinforcing rib; 113 - fireproof layer; 121 - first bottom portion; 122 - first side portion; 131 - second bottom portion; 132 - second side portion; 1121 - mounting hole; 20 - battery cell; 21 - casing; 22 - electrode assembly; 23 - electrode terminal; 211 - housing; 212 - end cover; 221 - main body portion; 222 - tab. DETAILED DESCRIPTION

[0059] ​In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be clearly and detailedly described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as those commonly understood by one of ordinary skill in the art to which this application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "comprise" and "have" and any variations thereof in the present application are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the present application are used to distinguish different objects, not to describe a particular order or primary and secondary relationships.

[0061] In the present application, referring to "embodiments" means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiments, nor are they necessarily mutually exclusive or alternative embodiments to one another.

[0062] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0063] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0064] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the present application.

[0065] As used herein, the term "plurality" means two or more (including two).

[0066] In embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be used continuously by activating the active material through charging after discharging the battery cell.

[0067] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the present application is not limited thereto.

[0068] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can prevent the positive and negative electrodes from shorting to some extent, while allowing the active ions to pass through.

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

[0070] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0071] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a high molecular 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 molecular material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0072] As an example, the positive 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 active material can also be used. These positive 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, and 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 LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which can also be referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2), and modified compounds thereof, and the like.

[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, or the like. When the foamed metal is used as the positive electrode, the foamed metal surface can not be provided with a positive active material, or of course can be provided with a positive active material. As an example, the foamed metal can also be filled or / and deposited with a lithium source material, a potassium metal, or a sodium metal, the lithium source material being a 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, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, 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 sheet 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 only one 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 electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0081] In some embodiments, the separator is a separator film. The separator film can be various, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0082] 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 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.

[0083] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes and functions to transport ions and separate the positive and negative electrodes.

[0084] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid, gel, or solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0085] 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 difluoroboric oxalate, lithium bisoxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorodioxalate phosphate.

[0086] 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, butanediol sulfone, 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.

[0087] Among them, the gel electrolyte includes a polymer as a skeleton network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0088] Among them, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0089] 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.

[0090] 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), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0091] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0092] 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.

[0093] In some embodiments, the electrode assembly is in a stacked structure.

[0094] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0095] 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 that are stacked. One positive electrode sheet is clamped between adjacent folded segments.

[0096] As an example, the positive electrode sheet and the negative electrode sheet are both folded to form a plurality of folded segments that are stacked.

[0097] As an example, a plurality of separators can be provided, and each of the plurality of separators is provided between any adjacent positive electrode sheet or negative electrode sheet.

[0098] As an example, the separators can be continuously provided, and the separators are provided between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0099] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0100] In some embodiments, the electrode assembly is provided with a tab. The tab can guide current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0101] 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.

[0102] 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, but is not limited to, a square battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, and a multi-prismatic battery cell such as a hexagonal prismatic battery cell, etc.

[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, which 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 battery apparatus refers to an energy storage device, which includes a box with at least one side provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0109] With the rapid development of new energy technology, battery apparatuses have been widely used in the fields of electronic devices, electric vehicles, electric two-wheel vehicles, electric tools, etc. With the increasingly wide application of battery apparatuses, higher requirements for lightweight and reliability of battery apparatuses are put forward.

[0110] Generally, the battery apparatus includes a box, which is usually made of high-strength steel or aluminum and other metals, thereby providing protection for the internal battery cells and other components and reducing the risk of damage to the battery cells caused by external impact, collision, or drop, etc. However, most of the metal material boxes are generally heavy, which is not conducive to the lightweight of the battery apparatus.

[0111] The use of high-strength injection molding parts for the box can meet the strength requirements while reducing the weight. However, the injection molding parts are prone to deformation in a high-temperature environment, especially the frame (e.g., flange) in the box as a connecting structure, which is more obvious due to the narrow width, and is prone to cause connection failure and sealing failure, etc.

[0112] Consider increasing the thickness or using higher strength injection molding material to improve the strength of the box during the injection molding process of the injection molding part, so as to reduce the risk of deformation at high temperature. However, since the injection molding part is usually injection molded at one time, although increasing the thickness of the injection molding part can improve the overall strength, the overall weight will also increase, which is not conducive to the lightweight of the battery device; although the high-strength material can improve the overall strength, the cost will also increase, which is not conducive to cost control.

[0113] Splitting the parts that need to be connected in the box, and connecting them through the insert injection molding process, can improve the connection strength, and can perform local thickening treatment or use higher strength material for parts with high strength requirements in the split parts, thereby facilitating lightweight and meeting the strength requirements.

[0114] Based on the above considerations, the embodiment of the present application provides a battery device, comprising: a battery monomer; a box for accommodating the battery monomer, the box comprising a first box component, the first box component comprising a base plate and a frame, the frame being injection molded around the base plate by insert injection molding, and the frame being provided with a mounting hole.

[0115] By comprising the base plate and the frame in the first box component, and the frame being injection molded around the base plate by insert injection molding, and the frame being provided with the mounting hole, i.e. the first box component is divided into two parts, one part is the base plate, and the other part is the frame, the frame is connected together with the base plate by insert injection molding, thereby improving the connection strength and the reliability of the box, and the base plate and the frame can be selectively selected with appropriate materials and / or thicknesses, which is conducive to lightweight and strength requirements.

[0116] The battery device disclosed in the embodiment of the present application can be used in electric devices such as vehicles, ships or aircrafts. The power supply system of the electric device can be composed of the battery device disclosed in the present application, which is conducive to alleviating the problem of internal short circuit or fire explosion of the battery monomer during use, thereby improving the use reliability of the battery monomer.

[0117] The battery device provided by the embodiment of the present application is used as a power supply for an electric device, which can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric automobile, a ship, a spacecraft, etc. The electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0118] The following embodiments are described with reference to a vehicle as an example of an electric device of an embodiment of the present application for convenience of description.

[0119] Please refer to Figure 1 ,Figure 1 A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric vehicle, a hybrid electric vehicle, or a range extended electric vehicle, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery device 100 can be used to supply power for the vehicle 1000, for example, the battery device 100 can be used as an operating power source or a use power source of the vehicle 1000, etc. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 is used to control the battery device 100 to supply power for the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0120] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source or a use power source of the vehicle 1000, but also be used as a 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.

[0121] The following refers to Figures 1 to 12 The embodiments of the present application are described in detail.

[0122] The embodiments of the present application provide a battery device 100, which includes a battery monomer 20 and a box body 10, the box body 10 is used to accommodate the battery monomer 20, the box body 10 includes a first box body component 101, the first box body component 101 includes a base plate 111 and a frame 112, the frame 112 is insert injection molded around the base plate 111, and the frame 112 is provided with a mounting hole 1121.

[0123] The box body 10 is used to provide an accommodation space for the battery monomer 20. In the battery device 100, the battery monomer 20 arranged in the box body 10 can be multiple. The multiple battery monomers 20 can be in series, parallel or mixed connection, the mixed connection means that the multiple battery monomers 20 have both series connection and parallel connection. The multiple battery monomers 20 can be directly connected in series, parallel or mixed connection together, and then the whole of the multiple battery monomers 20 is accommodated in the box body 10; of course, the battery device 100 can also be that the multiple battery monomers 20 are first connected in series, parallel or mixed connection to form a battery module, and then the multiple battery modules are connected in series, parallel or mixed connection to form a whole, and the whole is accommodated in the box body 10.

[0124] In some embodiments, the battery device 100 can further include other structures, for example, the battery device 100 can further include a current collecting component, the current collecting component is used to connect the multiple battery monomers 20 to realize the electrical connection between the multiple battery monomers 20.

[0125] Each battery cell 20 can be a secondary battery or a primary battery, and can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can have a cuboid, a cylinder, a prism, or other shapes, etc. For example, in the embodiment shown in Figure 3 , the battery cell 20 has a cuboid structure.

[0126] For example, referring to Figure 3 , the battery cell 20 includes a shell 21 and an electrode assembly 22 disposed in the shell 21.

[0127] The shell 21 can also be used to contain an electrolyte, such as an electrolyte solution. The shell 21 can have various structural forms, such as a cylinder or a cuboid, etc. Similarly, the shell 21 can also have various materials, such as copper, iron, aluminum, steel, or aluminum alloy, etc.

[0128] Optionally, the shell 21 can include a shell body 211 and an end cover 212, the shell body 211 has an internal cavity formed therein for containing the electrode assembly 22, and the internal cavity has an opening, that is, the shell body 211 has a hollow structure with an opening at one end, and the end cover 212 is sealed to the opening of the shell body 211 to form a sealed space for containing the electrode assembly 22 and the electrolyte.

[0129] The shell body 211 can have various shapes, such as a cylinder, a cuboid, or a prism structure, etc. The shape of the shell body 211 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, a cylindrical shell body 211 can be selected; if the electrode assembly 22 has a cuboid structure, a cuboid shell body 211 can be selected. Of course, the structure of the end cover 212 can also be various, such as a plate structure or a hollow structure with an opening at one end, etc. For example, in the embodiment shown in Figure 3 , the shell body 211 has a cuboid structure.

[0130] Of course, it can be understood that the shell 21 is not limited to the above structure, and the shell 21 can also have other structures, for example, the shell 21 can include a shell body 211 and two end covers 212, the shell body 211 has a hollow structure with openings at opposite sides, and one end cover 212 is sealed to one opening of the shell body 211 to form a sealed space for containing the electrode assembly 22 and the electrolyte, that is, the shell body 211 has openings at opposite sides, and the two end covers 212 are respectively sealed to the two sides of the shell body 211 to close the corresponding openings.

[0131] It should be noted that the electrode assembly 22 is a component in which an electrochemical reaction occurs in the battery cell 20, and the structure of the electrode assembly 22 can be various, for example, the electrode assembly 22 can be a jelly-roll structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, or can be a stacked structure formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet.

[0132] Exemplarily, the separator is a separator film, and the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0133] The electrode assembly 22 includes a main body part 221 and a tab 222, the main body part 221 is a main component in which an electrochemical reaction occurs in the battery cell 20, and exemplarily, in the main body part 221, the positive electrode sheet and the negative electrode sheet are arranged in a stacked manner. Figure 3 The tab 222 is connected to one end of the main body part 221 close to the end cover 212, so as to connect the tab 222 with the electrode terminal 23. The tab 222 can be directly connected with the electrode terminal 23, or can be connected through an adapter component.

[0134] Optionally, the electrode assembly 22 accommodated in the shell 21 can be one or multiple. Exemplarily, in the battery cell 20, Figure 3 The shell 21 of the battery cell 20 is provided with multiple electrode assemblies 22, and the multiple electrode assemblies 22 are arranged in a stacked manner. When multiple electrode assemblies 22 are arranged in the shell 21 of the battery cell 20, the number of the electrode assemblies 22 can be two, three, four, five, or six, etc.

[0135] The electrode terminal 23 serves to electrically connect the electrode assembly 22, so as to serve as an output pole or an input pole of the battery cell 20, thereby being capable of outputting or inputting the electric energy of the battery cell 20.

[0136] Exemplarily, the material of the electrode terminal 23 can also be various, for example, the material of the electrode terminal 23 can be copper, iron, aluminum, steel, or aluminum alloy, etc.

[0137] The electrode terminal 23 serves to electrically connect the electrode assembly 22, so as to serve as an output pole or an input pole of the battery cell 20, thereby being capable of outputting or inputting the electric energy of the battery cell 20. Figure 3 The battery cell 20 includes two electrode terminals 23, and correspondingly, each electrode assembly 22 has two tabs 222, the polarities of the two tabs 222 are opposite, that is, the two tabs 222 are positive and negative electrodes of the input or output electrode assembly 22, and the two electrode terminals 23 are electrically connected with the two tabs 222 of the electrode assembly 22, so as to realize the input or output of the positive and negative electrodes of the battery cell 20.

[0138] The structure of the electrode terminal 23 mounted on the shell 21 can be various, exemplarily, in the battery cell 20, Figure 3In the embodiment, the two electrode terminals 23 are mounted on the end cover 212. Of course, the structure of the battery cell 20 is not limited to this, and in other embodiments, the two electrode terminals 23 can be mounted on the housing 211 of the case 21, and the two electrode terminals 23 can also be one mounted on the housing 211 of the case 21 and the other mounted on the end cover 212 of the case 21.

[0139] The case 10 can have various structures. In some embodiments, the case 10 can include a case body 12 and a cover 11, the case body 12 and the cover 11 being mutually coverable, and the case body 12 and the cover 11 together defining an assembly space for accommodating the battery cell 20.

[0140] In some embodiments, the case 10 can further include a protection plate 13 for protecting the battery device 100 and reducing damage when being scratched. As an example, the protection plate 13 can be mounted on the bottom of the case body 12.

[0141] The case 10 can be part of the chassis structure of the vehicle 1000. For example, the cover 11 of the case 10 can be at least part of the floor of the vehicle.

[0142] The case 10 formed by the case body 12 and the cover 11 can have various shapes, such as a cylinder, a cuboid, or a square, etc. For example, in the embodiment, the case 10 has a cuboid shape. Figure 2 In the embodiment, the case 10 has a cuboid shape.

[0143] The case 10 includes a first case component 101, the first case component 101 including a base plate 111 and a frame 112. As an example, the case 10 can include one or more second case components. The first case component 101 can be the case body 12, or the cover 11, or the protection plate 13, or other components in the case 10. For example, the first case component 101 is the cover 11, and the second case component is the case body 12.

[0144] For example, with reference to Figure 2 , the first case component 101 is the case body 12, the base plate 111 is a first bottom 121 of the case body 12 for supporting the battery cell 20, and the frame 112 is a first side 122 of the case body 12 surrounding the first bottom 121. For another example, the first case component 101 is the cover 11, the base plate 111 is a portion of the cover 11 facing the first bottom 121, and the frame 112 is a portion connected with the first side 122. For another example, the first case component 101 is the protection plate 13, the base plate 111 is a second bottom 131 of the protection plate 13 facing the first bottom 121, and the frame 112 is a second side 132 of the protection plate 13 surrounding the second bottom 131.

[0145] It should be noted that any one or two of the box body 12, the cover body 11 and the protective plate 13 is the first box body part 101, or all of them are the first box body part 101. In the following description, the cover body 11 is taken as an example for description.

[0146] The frame 112 is injection molded around the substrate 111, and the frame 112 is provided with a mounting hole 1121. A part of the substrate 111 can be embedded in the frame 112 by the insert injection molding process, or a part of the frame 112 can be embedded in the substrate 111 by the insert injection molding process. The mounting hole 1121 can be formed during the injection molding of the frame 112, or it can be machined separately after the injection molding. The mounting hole 1121 can be used to mount a fastener (such as a bolt) to fixedly connect the first box body part 101.

[0147] As an example, the substrate 111 can be placed in a specified position in a mold in advance, then the material of the frame 112 is heated and melted into a melt, and the melt is injection molded into the mold, and after cooling and solidification, the melt is embedded in the substrate 111 or the substrate 111 is embedded in the melt, so that the frame 112 and the substrate 111 are firmly connected together and the mounting hole 1121 is formed in the frame 112, and finally the mold is removed to form the cover body 11.

[0148] The substrate 111 can be metal, alloy, plastic, fiber-reinforced composite material, etc., and the frame 112 can be plastic, fiber-reinforced composite material, etc.

[0149] The material of the substrate 111 and the material of the frame 112 can be the same or different. The thickness of the substrate 111 and the thickness of the frame 112 can be the same or different.

[0150] As an example, the first box body part 101 is the cover body 11, the frame 112 in the cover body 11 is provided with the mounting hole 1121, and the frame 112 serves as the connection part with the box body 12. Since the frame 112 is injection molded around the substrate 111, the thickness of the frame 112 can be appropriately increased during injection molding to improve the strength (such as bending strength) of the frame 112, thereby improving the connection reliability. In addition, the thickness of the substrate 111 can be appropriately reduced to reduce the weight of the substrate 111, thereby facilitating lightweight.

[0151] As another example, the first box body part 101 is the cover body 11, and the frame 112 can be formed of a material with higher strength during injection molding to improve the strength of the frame 112, thereby improving the connection reliability. In addition, the substrate 111 in the cover body 11 can be formed of a material that meets general strength requirements to reduce costs.

[0152] Thus, by including the substrate 111 and the frame 112 in the first case member 101, and by insert-molding the frame 112 around the substrate 111, the mounting hole 1121 is provided on the frame 112, i.e., the first case member 101 is divided into two parts and then insert-molded together, the substrate 111 and the frame 112 can be selected with appropriate materials and / or thicknesses, etc. to meet the requirements of lightweight and strength, and because the substrate and the frame are insert-molded, the connection between the substrate and the frame is more secure, thereby improving the reliability of the case.

[0153] In some embodiments, the frame 112 includes a side wall 112a and a flange portion 112b, the side wall 112a surrounds the substrate 111 and is connected to the circumferential edge of the substrate 111, the flange portion 112b is connected to one end of the side wall 112a away from the substrate 111, and the mounting hole 1121 is provided on the flange portion 112b.

[0154] The side wall 112a surrounds the substrate 111 and is connected to the circumferential edge of the substrate 111, so that the first case member 101 forms a hollow structure with one end open, and the first case member 101 is connected and fixed through the mounting hole 1121 on the flange portion 112b.

[0155] As an example, referring to Figures 4 to 6 , the first case member 101 is the cover 11, the flange portion 112b of the cover 11 is used to cover the flange portion of the case body 12, and a fastener is installed in the mounting hole 1121 of the flange portion 112b, so as to fixedly connect the cover 11 and the case body 12, thereby the cover 11 and the case body 12 together define an assembly space for accommodating the battery monomer 20. Among them, the case body 12 can also be the first case member 101, like the cover 11, by insert-molding, of course, the case body 12 can also not be insert-molded, for example, by one-time injection molding or casting molding or stamping molding, etc.

[0156] The first case member 101 is insert-molded, which can conveniently form the frame 112 with the side wall 112a and the flange portion 112b, thereby easily meeting the strength requirements of the frame 112, the connection reliability requirements of the frame 112 and the substrate 111, and the lightweight requirements of the case 10, without changing the structure of the case 10 too much.

[0157] In some embodiments, referring to Figure 6 , the frame 112 further includes a reinforcing rib 112c, which is provided between the side wall 112a and the flange portion 112b.

[0158] The reinforcing ribs 112c can be integrally injection molded with the frame 112, i.e., the reinforcing ribs 112c are formed during the insert injection molding of the frame 112. The number of reinforcing ribs 112c can be multiple, and the multiple reinforcing ribs 112c are spaced apart along the circumference of the frame 112.

[0159] The reinforcing ribs 112c can strengthen the bending strength of the frame 112, reduce the risk of deformation of the frame 112 due to heat, and thus improve the reliability of the first box body part 101 during connection.

[0160] In some embodiments, the circumferential edge 1113a of the substrate 111 is formed with a sawtooth portion 111a, and the frame 112 is connected with the sawtooth portion 111a.

[0161] The shape of the sawtooth portion 111a can be various, such as triangular, rectangular, trapezoidal, etc. Figure 7 and Figure 8 The sawtooth portion 111a in the trapezoidal shape is shown in FIG. 11B. The sawtooth portion 111a can be formed by providing a plurality of through holes in the substrate 111, the plurality of through holes penetrating the first surface 1111 and the second surface 1112 along the thickness direction Z of the substrate 111, and the plurality of through holes being spaced apart along the circumference of the substrate 111, so that the portions of the circumferential edge 1113a of the substrate 111 between the plurality of through holes form the sawtooth portion 111a. The through holes can be trapezoidal through holes or circular through holes or elliptical through holes, etc.

[0162] By forming the sawtooth portion 111a on the circumferential edge 1113a of the substrate 111, the frame 112 can be more fully contacted with the substrate 111 during the injection molding of the frame 112, so as to strengthen the connection strength between the substrate 111 and the frame 112 and improve the connection reliability.

[0163] In some embodiments, the substrate 111 includes a first surface 1111 and a second surface 1112 opposite along the thickness direction Z, and an outer circumferential surface 1113 connecting the first surface 1111 and the second surface 1112; the outer circumferential surface 1113 is formed with a groove 111b, and the frame 112 is connected with the outer circumferential surface 1113, and a portion of the frame 112 is embedded in the groove 111b.

[0164] During the injection molding of the frame 112, the material of the frame 112 flows into the groove 111b in a molten state, and after solidification, a portion of the frame 112 is firmly embedded in the groove 111b.

[0165] The shape of the groove 111b can be various, such as rectangular, trapezoidal, circular, triangular, or other shapes.

[0166] By forming the groove 111b on the outer circumferential surface 1113 of the substrate 111, and embedding a portion of the frame 112 in the groove 111b, the frame 112 and the substrate 111 can form a reliable connection.

[0167] In some embodiments, referring to Figure 10 The groove 111b includes a groove bottom surface 111b-1 and two opposite groove side surfaces 111b-2, and the distance between the two groove side surfaces 111b-2 gradually decreases in a direction away from the groove bottom surface 111b-1.

[0168] Thus, the opening of the groove 111b is tapered, and the space in the groove 111b closer to the opening is narrower, which can reduce the risk of the part of the side wall 112a embedded in the groove 111b being separated from the groove 111b, thereby improving the connection firmness of the bezel 112 and the substrate 111.

[0169] In some embodiments, the groove 111b extends along the circumference of the substrate 111.

[0170] As an example, referring to Figure 9 and Figure 10 The groove 111b extending along the circumference of the substrate 111 is a continuous long groove 111b.

[0171] Thus, a part of the bezel 112 is continuously embedded in the groove 111b of the outer circumferential surface 1113 of the substrate 111, thereby making the connection more firm.

[0172] In some embodiments, the substrate 111 includes a first surface 1111 and a second surface 1112 opposite along the thickness direction Z thereof, and an outer circumferential surface 1113 connecting the first surface 1111 and the second surface 1112; the outer circumferential surface 1113 is formed with a protrusion 111c, the bezel 112 is connected with the outer circumferential surface 1113, and the protrusion 111c is embedded in the bezel 112.

[0173] In the insert injection molding process of the bezel 112 and the substrate 111, the material of the bezel 112 is connected with the protrusion 111c in a molten state, for example, can be wrapped around the protrusion 111c, and after solidification, the protrusion 111c is embedded in the bezel 112.

[0174] The shape of the protrusion 111c can be various, such as rectangular, trapezoidal, circular, triangular or other shapes. The protrusion 111c can be a continuous single protrusion 111c, or a plurality of non-continuous protrusions 111c. The shapes of the plurality of protrusions 111c can be the same or different. Figure 11 A rectangular protrusion 111c is shown.

[0175] The protrusion 111c is formed on the outer circumferential surface 1113 of the substrate 111, and the protrusion 111c is embedded in the bezel 112, thereby forming a reliable connection between the bezel 112 and the substrate 111.

[0176] In some embodiments, a plurality of protrusions 111c are provided, and the plurality of protrusions 111c are arranged at intervals along the circumference of the substrate 111.

[0177] Since the plurality of protrusions 111c are arranged at intervals along the circumference of the substrate 111, a space for accommodating the frame 112 is formed between two adjacent protrusions 111c, so that the protrusions 111c are more fully embedded in the frame 112, forming a reliable connection.

[0178] In some embodiments, the substrate 111 includes a first surface 1111 and a second surface 1112 opposite along the thickness direction Z thereof, and an outer circumferential surface 1113 connecting the first surface 1111 and the second surface 1112; the roughness Ra of the outer circumferential surface 1113 is greater than the roughness Ra of the first surface 1111 and / or the second surface 1112, and the frame 112 is connected with the outer circumferential surface 1113.

[0179] The roughness Ra can be measured by a surface profiler or a contact roughness meter. For example, the roughness Ra value can be measured under the condition that the sampling length is 0.25 mm, 0.8 mm, 2.5 mm, etc., and the measurement speed is 0.1 mm / s to 1 mm / s.

[0180] Since the outer circumferential surface 1113 of the substrate 111 is the connection interface with the frame 112, the rougher the roughness of the outer circumferential surface 1113, the greater the contact area, the more sufficient the contact, and the more firm the connection. Therefore, by making the roughness Ra of the outer circumferential surface 1113 greater than the roughness Ra of the first surface 1111 and / or the second surface 1112, the connection reliability can be improved.

[0181] In some embodiments, the thickness D1 of the frame 112 is greater than the thickness D2 of the substrate 111.

[0182] Since the frame 112 is a connection structure in the first box member 101, in order to improve the connection reliability, in the case that the frame 112 and the substrate 111 adopt the same relatively light injection molding part, the thickness D1 of the flange part 112b can be appropriately increased, which is beneficial to lightweighting and can also meet the connection strength requirement. Of course, the frame 112 can also adopt a different material from the substrate 111.

[0183] The entire thickness of the frame 112 can be greater than the thickness of the substrate 111, or part of the thickness of the frame 112 can be greater than the thickness of the substrate 111. Figure 10 and Figure 11 As shown in the middle, the thickness of the flange part 112b of the frame 112 is greater than the thickness of the substrate 111.

[0184] By making the thickness D1 of the frame 112 greater than the thickness D2 of the substrate 111, it is beneficial to both lightweighting and improving the connection strength.

[0185] In some embodiments, the material of the frame 112 is different from the material of the substrate 111, and the bending strength of the frame 112 is greater than the bending strength of the substrate 111.

[0186] The bending strength of the frame 112 and the substrate 111 can be measured according to the three-point bending test method in the standard ISO 178. The sample size is 80 mm in length, 10 mm in width, and 4 mm in thickness, the span of the two ends is 64 mm, and a concentrated load is applied at the middle position at a speed of 2±0.4 mm / min. The bending strength is measured under the action of the load, and the sample is bent by 1.5×4 mm, i.e. 6 mm.

[0187] Since the frame 112 serves as a connecting component, it requires higher bending resistance. By using different materials for the substrate 111 and the frame 112, the frame 112 is injection molded with a material having high bending strength, which can improve the connection reliability, and the substrate 111 is made of a material with relatively light weight, which is beneficial to lightweight.

[0188] In some embodiments, the substrate 111 is a molded part or a stamped part.

[0189] The substrate 111 can be molded with plastic. The substrate 111 can also be stamped with metal.

[0190] The molded part or the stamped part allows the substrate 111 to be thinner, which is beneficial to lightweight.

[0191] In some embodiments, both the substrate 111 and the frame 112 are fiber-reinforced resins.

[0192] Fiber-reinforced resin is a composite material composed of a resin matrix and reinforcing fibers. The resin can be thermosetting or thermoplastic resin, and the fiber can be glass fiber, carbon fiber, Kevlar fiber, etc. Fiber-reinforced resin combines the molding property of resin and the high strength, rigidity, impact resistance, etc. of fiber.

[0193] By using fiber-reinforced resin for both the substrate 111 and the frame 112, compared with most metal materials, the strength requirement and lightweight can be met.

[0194] In some embodiments, the substrate 111 is a continuous fiber-reinforced resin, and the frame 112 is a short fiber-reinforced resin.

[0195] The substrate 111 can be formed by molding a continuous fiber-reinforced resin, and then the frame 112 can be formed by injection molding a short fiber-reinforced resin around the substrate 111.

[0196] For example, the first case member 101 is the cover 11. In the case where the cover 11 has an open cavity structure at one end, a large step is formed between the frame 112 and the base plate 111, which causes a problem that the continuous fiber reinforced resin cannot be molded in one step to form the cover 11. This problem can be solved by molding the base plate 111 with the continuous fiber reinforced resin and molding the frame 112 with the short fiber reinforced resin.

[0197] By using the continuous fiber reinforced resin for the base plate 111 and the short fiber reinforced resin for the frame 112, even in the case where a large step is formed between the frame 112 and the base plate 111 in the first case member 101, insert injection molding can be achieved, which satisfies the requirement of lightweight and strength.

[0198] In some embodiments, the resin material of the continuous fiber reinforced resin is selected from polypropylene, polycarbonate, polyethylene terephthalate, polyphenylene ether, polyphenylene sulfide, polyamide resin, polybutylene terephthalate, polyimide, polyether ether ketone, and combinations thereof. The continuous fiber material of the continuous fiber reinforced resin is selected from glass fiber, carbon fiber, basalt fiber, and combinations thereof.

[0199] The suitable resin material and the suitable continuous fiber material in the resin of the continuous fiber reinforced resin can both improve the strength and reduce the weight.

[0200] In some embodiments, the resin material of the short fiber reinforced resin is selected from polyimide, polyether ether ketone, polyphenylene sulfide, and combinations thereof. The short fiber material of the short fiber reinforced resin is selected from cotton fiber, polyester short fiber, and viscose fiber, and combinations thereof.

[0201] The suitable resin material and the suitable short fiber material in the resin of the short fiber reinforced resin can both improve the strength and reduce the weight.

[0202] In some embodiments, the base plate 111 is a ceramic plate or a metal plate.

[0203] The ceramic plate has high temperature resistance and corrosion resistance, is not easy to deform at high temperature, and is not easy to be eroded in harsh environments, thereby improving the reliability.

[0204] The metal plate has high strength and can shield electromagnetic interference, thereby improving the reliability. The metal plate can be a steel plate, an aluminum plate, an aluminum alloy plate, a titanium alloy plate, etc.

[0205] In some embodiments, the base plate 111 is provided with a fireproof layer 113 on at least one surface along the thickness direction Z thereof.

[0206] The fireproof layer 113 can be formed on either one or both of the opposite surfaces of the base plate 111 along the thickness direction Z thereof. The fireproof layer 113 can be a fireproof coating or mica paper.

[0207] As an example, the fireproof layer 113 is formed on the surface of the substrate 111 while the fiber reinforced resin is molded to form the substrate 111. For example, the mica paper can be laid on the surface of the fiber reinforced resin which is not molded, and then the substrate 111 with the fireproof layer 113 on the surface is formed by molding.

[0208] By arranging the fireproof layer 113 on the surface of the substrate 111, a certain fireproof protection can be achieved, which helps to reduce the risk of fire when the battery cell fails (such as short circuit or thermal runaway).

[0209] The following refers to Figures 2 to 12 , a specific example of the present application is described.

[0210] The battery device 100 provided by the embodiments of the present application includes a box body 10 and a battery cell 20, and the battery cell 20 is contained in the box body 10. The box body 10 includes a box main body 12 and a cover body 11, and the cover body 11 includes a substrate 111 and a frame 112. The substrate 111 is a large surface of the cover body 11, and the frame 112 is a side around the substrate 111. Specifically, the cover body 11 is a cavity with an open end, and the frame 112 includes a side wall 112a and a flange part 112b. The side wall 112a is connected to the periphery of the substrate 111, and the flange part 112b is provided with a plurality of mounting holes 1121. The cover body 11 is covered with the box main body 12 through the mounting holes 1121, so as to close the open end of the box main body 12. The substrate 111 is molded by continuous fiber reinforced resin, and the frame 112 is injection molded by short fiber reinforced resin around the substrate 111. The connecting interface (the outer peripheral surface) of the substrate 111 is formed with a sawtooth structure or a convex structure or a groove structure, etc. In addition, the mica paper can be laid on the surface of the continuous fiber reinforced resin, so as to form the substrate 111 with the mica paper on the surface during the molding of the substrate 111.

[0211] The embodiments of the present application also provide a manufacturing method of a box component, which refers to Figure 13 , and includes a step S11 and a step S12.

[0212] In the step S11, the substrate 111 is prepared;

[0213] In the step S12, the frame 112 with the mounting holes 1121 is formed around the substrate 111 by the insert injection molding process.

[0214] The substrate 111 can be a metal piece or a metal alloy piece, which is formed by stamping. The substrate 111 can also be an injection molded piece, which is formed by injection molding.

[0215] As an example, taking the first box body part 101 as a cover as an example, the substrate 111 can be placed in a predetermined position in the mold in advance, then the material as the frame 112 is heated and melted into a melt, and the melt is injected into the mold, so that the melt is embedded in the substrate 111 or the substrate 111 is embedded in the melt, after cooling and solidification, the frame 112 and the substrate 111 are firmly connected together and the mounting hole 1121 is formed in the frame 112, and finally the cover 11 is formed by demolding.

[0216] The frame 112 with the mounting hole 1121 around the substrate 111 is formed by the insert injection molding process, and the respective suitable materials and / or thicknesses of the substrate 111 and the frame 112 can be selected to meet the lightweight and strength requirements, and because the substrate and the frame are insert injection molded, the connection between the two is more firm, thereby improving the reliability of the box.

[0217] In some embodiments, step S11 includes: compression molding the continuous fiber reinforced resin material into the substrate 111. Step S12 includes: injection molding the short fiber reinforced resin into the frame 112 by the insert injection molding process.

[0218] The continuous fiber reinforced resin has high strength and can be made thinner by compression molding to meet the strength requirements. The short fiber reinforced resin has high plasticity and can be injection molded even if there is a large step between the frame 112 and the substrate 111, and the thickness can be appropriately increased to meet the strength requirements.

[0219] The resin material of the continuous fiber reinforced resin can be selected from polypropylene, polycarbonate, polyethylene terephthalate, polyphenylene ether, polyphenylene sulfide, polyamide resin, polybutylene terephthalate, polyimide, polyether ether ketone, and combinations thereof. The continuous fiber material of the continuous fiber reinforced resin can be selected from glass fiber, carbon fiber, basalt fiber, and combinations thereof.

[0220] The resin material of the short fiber reinforced resin can be selected from polyimide, polyether ether ketone, polyphenylene sulfide, and combinations thereof. The short fiber material of the short fiber reinforced resin can be selected from cotton fiber, polyester short fiber, and viscose fiber, and combinations thereof.

[0221] The substrate 111 can be made thinner by compression molding the continuous fiber reinforced resin material, meeting the lightweight requirement, and the frame 112 is injection molded by the short fiber reinforced resin material, even if a box body part with a large step between the frame 112 and the substrate 111 is needed, the insert injection molding can be realized, and the thickness can be increased to meet the strength requirements.

[0222] In some embodiments, step S11 comprises forming the fireproof layer 113 on the surface of the substrate 111 while the continuous fiber reinforced resin is molded into the substrate 111. The fireproof layer 113 can be mica paper. For example, the mica paper can be laid on the surface of the fiber reinforced resin before molding, and then the substrate 111 with the fireproof layer 113 on the surface is formed by molding.

[0223] By setting the fireproof layer 113 on the surface while forming the substrate 111, the production efficiency can be improved, and a certain fireproof protection can be achieved, which helps to reduce the risk of fire when the battery cell fails (such as short circuit or thermal runaway).

[0224] The embodiments of the present application also provide an electric device comprising the battery device 100 as described above.

[0225] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Various modifications and changes can be made by those skilled in the art based on the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized by, The battery device comprises: a battery cell; a box body for accommodating the battery cell, the box body comprising a first box component, the first box component comprising a base plate and a frame, the frame being insert-molded around the base plate, and the frame being provided with a mounting hole.

2. The battery device according to claim 1, wherein the frame comprises a side wall and a flange portion, the side wall being arranged around the base plate and connected to a circumferential edge of the base plate, and the flange portion being connected to an end of the side wall away from the base plate, and the mounting hole being arranged on the flange portion.

3. The battery device according to claim 2, wherein the frame further comprises a reinforcing rib, the reinforcing rib being connected between the side wall and the flange portion.

4. The battery device according to claim 1, wherein a circumferential edge of the base plate is formed with a sawtooth portion, and the frame is connected to the sawtooth portion.

5. The battery device according to claim 1, wherein the base plate comprises a first surface and a second surface opposite to each other in a thickness direction of the base plate, and an outer peripheral surface connecting the first surface and the second surface; the outer peripheral surface is formed with a groove, the frame is connected to the outer peripheral surface, and a portion of the frame is embedded in the groove.

6. The battery device according to claim 5, wherein the groove comprises a groove bottom surface and two groove side surfaces opposite to each other, and a distance between the two groove side surfaces gradually decreases in a direction away from the groove bottom surface.

7. The battery device according to claim 5, wherein the groove extends along a circumferential direction of the base plate.

8. The battery device according to claim 1, wherein the base plate comprises a first surface and a second surface opposite to each other in a thickness direction of the base plate, and an outer peripheral surface connecting the first surface and the second surface; the outer peripheral surface is formed with a protrusion, the frame is connected to the outer peripheral surface, and the protrusion is embedded in the frame.

9. The battery device according to claim 8, wherein a plurality of protrusions are arranged on the base plate, and the plurality of protrusions are arranged at intervals along a circumferential direction of the base plate.

10. The battery device according to claim 1, wherein the base plate comprises a first surface and a second surface opposite to each other in a thickness direction of the base plate, and an outer peripheral surface connecting the first surface and the second surface; a roughness of the outer peripheral surface is greater than a roughness of the first surface and / or the second surface, and the frame is connected to the outer peripheral surface.

11. The battery device according to any one of claims 1-10, wherein a thickness of the frame is greater than a thickness of the base plate.

12. The battery device according to any one of claims 1-10, wherein a material of the frame is different from a material of the base plate, and a bending strength of the frame is greater than a bending strength of the base plate.

13. The battery device according to any one of claims 1-10, wherein the base plate is a molded part or a stamped part.

14. The battery device according to any one of claims 1-10, wherein the base plate and the frame are both fiber-reinforced resins.

15. The battery device according to claim 14, wherein the substrate is a continuous fiber-reinforced resin, and the frame is a short fiber-reinforced resin.

16. The battery device according to any one of claims 1 to 10, wherein the substrate is a ceramic plate or a metal plate.

17. The battery device according to any one of claims 1 to 10, wherein the substrate is provided with a fireproof layer on at least one surface thereof in a thickness direction thereof.

18. The battery device according to any one of claims 1 to 10, wherein the case includes a case body and a lid, the case body and the lid being connected to form a housing space for housing the battery cells, and at least one of the case body and the lid is the first case member.

19. The battery device according to any one of claims 1 to 10, wherein the case includes a case body and a protection plate provided at a bottom of the case body, and the protection plate is the first case member.

20. An electrical device, comprising: including: the battery device according to any one of claims 1 to 19.

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