Battery device, box body assembly and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery device, a box body assembly and electric equipment, and the battery device comprises the box body assembly, a battery monomer and an electric connector. The box body assembly comprises a first box body and a panel, the first box body is provided with a placing groove facing a first side opening in the first direction, the panel is of a metal plate structure, and the panel is arranged on the circumferential wall, surrounding the first direction, of the first box body. And the battery monomers are arranged in the placing grooves. The electric connector is arranged on the panel. The panel is of a metal plate structure, compared with a die casting technology, equipment and procedures adopted by the metal plate structure are simple, the metal plate structure has the advantages of being low in development cost, good in structural strength and the like, and the electric connector can be assembled on the panel more stably.

Description

Technical Field

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

[0002] The battery device can be used to store or provide electrical energy. The battery device can be used in electrical equipment. For example, vehicles equipped with battery devices have been widely used. The battery device can be used to provide power for the vehicle in whole or in part.

[0003] In the related art, the battery device includes a box assembly and an electrical connector. The electrical connector is assembled on a die-cast panel of the box assembly. The die-cast panel has a problem of high development cost. Utility Model Content

[0004] In view of this, the embodiments of the present application hope to provide a battery device, a box assembly and an electrical device that can reduce development costs.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0006] The present application provides a battery device, including:

[0007] The box assembly comprises a first box and a panel, wherein the first box has a placement groove opening toward a first side in a first direction, and the panel is a sheet metal structure, and the panel is arranged on a circumferential wall of the first box surrounding the first direction;

[0008] A battery cell, wherein the battery cell is arranged in the placement groove;

[0009] An electrical connector is disposed on the panel.

[0010] The battery device provided in the embodiment of the present application has a panel that is a sheet metal structure. Compared with the die-casting process, the sheet metal structure uses simple equipment and processes and has the characteristics of low development cost and good structural strength. The electrical connector can be more securely assembled on the panel.

[0011] In some embodiments, the circumferential wall forms a notch, the panel seals and closes the notch, and the circumferential surface of the panel is flush with the circumferential surface of the circumferential wall.

[0012] In this embodiment, the panel replaces part of the solid structure of the circumferential wall, which can save materials and costs. The panel seals the gap to meet the waterproof and dustproof requirements of the box assembly. The circumferential surface of the panel is flush with the circumferential surface of the circumferential wall, and the surface flatness of the box assembly is better, which facilitates the assembly of the battery device and other structural parts.

[0013] In some embodiments, the panel includes a plate body and a folded edge, the folded edge is bent from one end of the plate body along the first side toward the placement groove, and the electrical connector is disposed on the plate body.

[0014] In this embodiment, the folded edge is bent from one end of the plate body along the first side toward the placement groove, and the plate body and the folded edge together form a roughly inverted L-shaped structure. The panel structure is simple, the development and design difficulty is low, and it is easy to manufacture and form.

[0015] In some embodiments, the circumferential wall forms a notch, the folded edge and the plate body are both embedded in the notch, the circumferential wall includes a first side wall and a second side wall, the first side wall and the second side wall are both facing the first side, the first side wall and the second side wall are spaced apart to define a portion of the notch, and the folded edge seals and connects the first side wall and the second side wall.

[0016] In this embodiment, the folded edge and the plate body are both embedded in the notch, and the folded edge and the plate body may not protrude from the surface of the circumferential wall, so that the folded edge and the second box body are installed in coordination, and the surface flatness of the box body assembly is better. The folded edge is sealed to connect the first side wall and the second side wall, so that the folded edge, the first side wall and the second side wall are all connected to the second box body, thereby improving the waterproof and dustproof performance of the box body assembly.

[0017] In some embodiments, the box assembly includes a rivet nut, the panel forms a mounting hole, the rivet nut is riveted to the mounting hole, and a fastener is passed through the electrical connector and threadedly connected to the rivet nut.

[0018] In this embodiment, the rivet nut is riveted to the mounting hole, which not only enables the rivet nut and the panel to be quickly assembled, avoiding the risk of thread slipping of the steel wire thread sleeve in the related art, but also enhances the sealing between the rivet nut and the panel. The fastener is threadedly connected to the rivet nut, and the electrical connector can be detachably connected to the panel to facilitate the disassembly and assembly of the electrical connector.

[0019] In some embodiments, the rivet nut is a compression rivet nut, an expansion rivet nut, or a pull rivet nut.

[0020] In this embodiment, the rivet nut can be one of a compression rivet nut, an expansion rivet nut and a pull rivet nut, which has good processability, a simple installation method of the rivet nut and the panel, and good durability.

[0021] In some embodiments, at least two of the mounting holes surround the electrical connector, and each of the mounting holes is correspondingly provided with a rivet nut.

[0022] In this embodiment, the connection stability between the electrical connector and the panel is improved by using a plurality of rivet nuts and a plurality of fasteners.

[0023] In some embodiments, the panel forms a socket, and a portion of the electrical connector is inserted into the socket.

[0024] In this embodiment, the insertion hole not only facilitates the positioning and installation of the electrical connector to the panel, but also reduces the degree to which the electrical connector protrudes from the panel.

[0025] In some embodiments, the panel forms a threading hole, and the guide wire of the electrical connector is inserted into the threading hole.

[0026] In this embodiment, the guide wire of the electrical connector can pass through the threading hole and enter the placement groove, so as to be connected with other devices in the placement groove.

[0027] In some embodiments, the box assembly includes a second box, the second box closes the opening of the placement slot toward the first side, the panel forms a first connecting hole, the circumferential wall forms a second connecting hole, some connecting parts are passed through the second box and the first connecting hole, and some connecting parts are passed through the second box and the second connecting hole.

[0028] In this embodiment, the first connection hole and the second connection hole are used to cooperate with the connector to fix the second box to the first box. The second box closes the opening of the placement slot toward the first side to form a closed space, which can better protect the battery monomer from contacting external objects.

[0029] In some embodiments, the panel and the circumferential wall are welded by cold metal transfer.

[0030] In this embodiment, cold metal transfer welding is a type of welding without slag splashing, which can reduce slag residue as much as possible and improve the welding quality of the panel and the circumferential wall.

[0031] An embodiment of the present application provides a box assembly, including a first box and a panel, wherein the first box has a placement groove opening on a first side in a first direction, and the panel is a sheet metal structure, and the panel is arranged on a circumferential wall of the first box surrounding the first direction.

[0032] The panel of the box assembly provided in the embodiment of the present application is a sheet metal structure. Compared with the die-casting process, the sheet metal structure uses simple equipment and processes, has the characteristics of low development cost and good structural strength, and the electrical connector can be more stably assembled on the panel.

[0033] An embodiment of the present application further provides an electrical device, comprising a battery device as described in any one of the above, wherein the battery device is used to store or provide electrical energy.

[0034] The electric equipment provided in the embodiment of the present application includes the battery device provided in the embodiment of the present application, and has the same or corresponding beneficial effects as the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the structure of a vehicle in an embodiment of the present application;

[0036] Figure 2 is a schematic structural diagram of a battery device in an embodiment of the present application;

[0037] Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle;

[0038] Figure 4 for Figure 2 An exploded schematic diagram of the structure shown;

[0039] Figure 5 for Figure 2 Schematic diagram of the structure of the middle part;

[0040] Figure 6 for Figure 5 An exploded schematic diagram of the structure shown;

[0041] Figure 7 This is a schematic diagram of the assembly of a panel and a riveted nut in an embodiment of the present application;

[0042] Figure 8 Schematic diagram of the structure of a riveted nut in one embodiment of the present application.

[0043] Description of Reference Numerals

[0044] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 1, box assembly; 11, first box; 11a, placement groove; 111, circumferential wall; 111a, notch; 111b, second connection hole; 111c, first side wall; 111d, second side wall; 1111, first side beam; 11111, first beam body; 11112, second beam body; 111 2. Second side beam; 1113. Third side beam; 112. Guard plate; 12. Panel; 12a. Mounting hole; 12b. Plug hole; 12c. Threading hole; 12d. First connecting hole; 121. Plate body; 122. Folding edge; 13. Riveted nut; 131. Screw-on portion; 132. Flange; 133. Toothed portion; 134. Positioning portion; 14. Second box body; 2. Electrical connector; 10. Fastener. DETAILED DESCRIPTION

[0045] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0047] In the description of the embodiments of the present application, technical terms such as "first", "second", "third", 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.

[0048] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0049] It should be noted that, in the present application, at least two includes two and more than two. A plurality includes two and more than two. The first direction is represented by X, wherein the first side of the first direction is represented by X1, the second side of the first direction is represented by X2, and the first side X1 and the second side X2 are opposite sides of the first direction. The second direction is represented by Y, and the third direction is represented by Z.

[0050] See also Figure 1 to Figure 2 To facilitate understanding of the battery cell, battery device 100 and electrical equipment provided in the embodiments of the present application, some basic structures of the battery cell, battery device 100 and electrical equipment provided in the embodiments of the present application are first introduced.

[0051] In the embodiment of the present application, the battery device 100 includes one or more battery cells.

[0052] The battery cell may be a secondary battery, which refers to a battery cell that can be continuously used by activating the active material by charging after the battery cell is discharged.

[0053] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-hydrogen battery cell, a nickel-cadmium battery cell or a lead-acid battery cell, etc., which is not limited in the embodiments of the present application.

[0054] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, which is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0055] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0056] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0057] As an example, the positive electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0058] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3O2 (also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05 O2) and at least one of its modified compounds. The modified compound refers to a substance obtained by modifying the above substances by means of doping or coating.

[0059] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0060] As an example, the negative electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver, etc., may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0061] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0062] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0063] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0064] In some embodiments, the negative electrode may be a foam metal. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. When the foam metal is used as the negative electrode sheet, the surface of the foam metal may not be provided with a negative electrode active material, but of course, a negative electrode active material may also be provided.

[0065] As an example, a negative electrode active material may be filled and / or deposited in the negative electrode current collector.

[0066] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0067] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0068] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be coated on the surface of the separator.

[0069] In some embodiments, the battery cell further includes an electrolyte, which is contained in the housing of the battery cell. The electrolyte plays a role in conducting active ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0070] The liquid electrolyte includes an electrolyte salt and a solvent.

[0071] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl imide), lithium bis(trifluoromethanesulfonyl imide), lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate and lithium tetrafluorooxalatophosphate.

[0072] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl 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, cyclopentane sulfone, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be selected from ether solvents. Ether solvents 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, methyltetrahydrofuran, diphenyl ether and crown ether.

[0073] In some embodiments, the electrolyte may also optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of battery cells, such as additives that improve overcharge / fast charge performance of battery cells, additives that improve high temperature performance of battery cells, additives that improve low temperature performance of battery cells, etc.

[0074] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0075] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0076] As examples, the polymer of the polymer solid electrolyte may include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, a polyionic liquid, cellulose, and the like.

[0077] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0078] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0079] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0080] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0081] In some embodiments, the electrode assembly is a laminate structure.

[0082] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0083] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0084] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0085] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0086] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0087] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0088] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0089] In some embodiments, the battery cell may include an outer shell. The outer shell may 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. In some embodiments, the outer shell may be a sealed structure or a non-sealed structure. As an example, when the outer shell is a non-sealed structure, the outer shell plays a role in protecting the electrode assembly, and a sealing bag is also included between the outer shell and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. When the outer shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0090] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal prismatic battery, such as a hexagonal prismatic battery, etc. There is no special limitation in the present application.

[0091] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided to cover the opening. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0092] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collecting member. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0093] In some embodiments, a pressure relief mechanism is provided on the housing, and the pressure relief mechanism is used to discharge the internal gas of the battery cell.

[0094] As an example, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, it is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode sheet, negative electrode sheet, electrolyte and separator in the battery cell.

[0095] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0096] The battery apparatus 100 (Battery Apparatus) mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity.

[0097] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0098] An embodiment of the present application provides an electrical device, including a battery device 100 in any one of the embodiments of the present application, and the battery device 100 is used to store or provide electrical energy.

[0099] The electrical equipment includes but is not limited to energy storage equipment, mobile phones, tablets, laptops, electric toys, electric tools, vehicles 1000, ships or spacecraft, etc. Among them, the vehicle 1000 may include battery vehicles and electric cars, the electric toys may include battery vehicles and electric cars, etc., fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and the spacecraft may include airplanes, rockets, space shuttles and spacecraft, etc.

[0100] In the following embodiments, for the convenience of description, an electric device according to an embodiment of the present application is taken as an example of a vehicle 1000. The following is a description with reference to the accompanying drawings.

[0101] Figure 1 The schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery device 100 is disposed inside the vehicle 1000, and the battery device 100 can be disposed at the bottom of the vehicle 1000 or at the front or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000, for example, the battery device 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0102] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0103] In the related art, the die-cast panel is manufactured by the die-casting process. The die-casting process requires that the molten metal raw material be passed into the mold of the casting equipment and high pressure be applied to solidify the molten metal into shape. The casting equipment and molds are expensive, resulting in high development costs for the die-cast panel. In addition, it is necessary to assemble a wire thread sleeve on the die-cast panel, and the bolts and the wire thread sleeves are threaded to fix the electrical connector to the die-cast panel. There is a risk of slipping between the die-cast panel and the wire thread sleeve.

[0104] In view of this, an embodiment of the present application provides a battery device, which includes a box assembly, a battery cell and an electrical connector. The box assembly includes a first box and a panel, the first box having a placement groove opening toward a first side in a first direction, the panel being a sheet metal structure, and the panel being arranged on a circumferential wall of the first box surrounding the first direction. The battery cell is arranged in the placement groove. The electrical connector is arranged on the panel.

[0105] The battery device provided in the embodiment of the present application has a panel that is a sheet metal structure. Compared with the die-casting process, the sheet metal structure uses simple equipment and processes and has the characteristics of low development cost and good structural strength. The electrical connector can be more securely assembled on the panel.

[0106] The battery device 100 provided in the embodiment of the present application is further described below in conjunction with the accompanying drawings. Figures 2 to 7The battery device 100 includes a box assembly 1, a battery cell and an electrical connector 2. The box assembly 1 includes a first box 11 and a panel 12. The first box 11 has a placement groove 11a opened toward a first side X1 in a first direction X. The panel 12 is a sheet metal structure and is disposed on a circumferential wall 111 of the first box 11 surrounding the first direction X. The battery cell is disposed in the placement groove 11a. The electrical connector 2 is disposed on the panel 12.

[0107] The battery cell can be placed into or taken out of the placement groove 11 a through the opening of the placement groove 11 a toward the first side X1 .

[0108] The electrical connector 2 is a device for connecting electrical circuits.

[0109] The type of the electrical connector 2 is not limited. For example, the electrical connector 2 includes but is not limited to a high-voltage connector or a low-voltage connector. The high-voltage connector refers to a connector with an operating voltage of not less than 24 V, and the low-voltage connector refers to a connector with an operating voltage of less than 24 V. The high-voltage connector is usually used for power transmission, and the low-voltage connector is usually used for communication signal transmission.

[0110] The sheet metal structure refers to a structure formed by cold working such as stamping, shearing and / or bending of a metal plate. In other words, the panel 12 is a structure formed by cold working such as stamping, shearing and / or bending of a metal plate.

[0111] In the battery device 100 provided in the embodiment of the present application, the panel 12 is a sheet metal structure. Compared with the die-casting process, the sheet metal structure uses simple equipment and processes, has the characteristics of low development cost and good structural strength, and the electrical connector 2 can be more firmly assembled on the panel 12.

[0112] The present application embodiment provides a box assembly 1, see Figures 2 to 7 The box assembly 1 includes a first box 11 and a panel 12. The first box 11 has a placement groove 11a opened to a first side X1 in a first direction X. The panel 12 is a sheet metal structure. The panel 12 is arranged on a circumferential wall 111 of the first box 11 surrounding the first direction X.

[0113] The box assembly 1 provided in the embodiment of the present application, the panel 12 is a sheet metal structure. Compared with the die-casting process, the sheet metal structure uses simple equipment and processes, has the characteristics of low development cost and good structural strength, and the electrical connector 2 can be more firmly assembled on the panel 12.

[0114] The panel 12 is made of metal material. For example, the panel 12 can be made of stainless steel, carbon steel, aluminum alloy or copper.

[0115] For some examples, see Figures 2 to 7The box assembly 1 includes a second box 14, which closes the opening of the placement groove 11a toward the first side X1, the panel 12 forms a first connecting hole 12d, the circumferential wall 111 forms a second connecting hole 111b, some connecting parts are inserted through the second box 14 and the first connecting hole 12d, and some connecting parts are inserted through the second box 14 and the second connecting hole 111b.

[0116] The surface of the panel 12 facing the first side X1 and the surface of the circumferential wall 111 facing the first side X1 can be sealed and connected with the second box 14. As an example, the box assembly 1 may include a sealing ring, which may be provided on the surface of the second box 14 facing the second side X2 of the first direction X, and the sealing ring is sealed between the panel 12 and the circumferential wall 111 and the second box 14. The gap between the panel 12 and the circumferential wall 111 and the second box 14 is sealed by elastic deformation of the sealing ring.

[0117] In this embodiment, the first connection hole 12d and the second connection hole 111b are used to cooperate with the connector to fix the second box 14 to the first box 11. The second box 14 closes the opening of the placement groove 11a toward the first side X1 to form a closed space, which can better protect the battery monomer from contacting external objects.

[0118] The connecting parts include but are not limited to screws or bolts.

[0119] The material of the sealing ring is not limited. For example, the sealing ring can be made of a flexible material, which refers to a material that can be stretched and / or bent and can recover. For example, the sealing ring can be made of silicone, rubber and / or foam.

[0120] For some examples, see Figure 2 , Figures 5 and 6 The circumferential wall 111 forms a notch 111 a , the panel 12 seals and closes the notch 111 a , and the circumferential surface of the panel 12 is flush with the circumferential surface of the circumferential wall 111 .

[0121] The circumferential surface of the panel 12 refers to a surface of the panel 12 surrounding the first direction.

[0122] The circumferential surface of the circumferential wall 111 refers to a surface of the circumferential wall 111 surrounding the first direction.

[0123] In this embodiment, the panel 12 replaces part of the solid structure of the circumferential wall 111, which can save materials and costs. The panel 12 seals and closes the gap 111a to meet the waterproof and dustproof requirements of the box assembly 1. The circumferential surface of the panel 12 is flush with the circumferential surface of the circumferential wall 111, and the surface flatness of the box assembly 1 is better, so that the battery device 100 and other structural parts can be assembled.

[0124] For some examples, see Figures 2 to 7 The panel 12 includes a plate body 121 and a folded edge 122 . The folded edge 122 is bent from one end of the plate body 121 along the first side X1 toward the placement groove 11 a . The electrical connector 2 is disposed on the plate body 121 .

[0125] Exemplarily, the metal plate is formed into the plate body 121 and the folded edge 122 through a bending process, for example, the metal plate is bent by a bending machine to form the plate body 121 and the folded edge 122 .

[0126] In this embodiment, the folded edge 122 is bent from one end of the plate body 121 along the first side X1 toward the placement groove 11a, and the plate body 121 and the folded edge 122 together form a roughly inverted L-shaped structure. The panel 12 has a simple structure, low development and design difficulty, and is easy to manufacture.

[0127] For some examples, see Figures 2 to 7 The folded edge 122 forms a first connection hole 12d. The thickness direction of the folded edge 122 is consistent with the first direction X, and the first connection hole 12d can penetrate two surfaces of the folded edge 122 along the first direction X.

[0128] The manufacturing process of the first connection hole 12d is not limited. For example, the first connection hole 12d can be manufactured by cold processing processes such as cutting and stamping, which has simple processes and low manufacturing costs.

[0129] For some examples, see Figures 2 to 7 The circumferential wall 111 forms a notch 111a, the folded edge 122 and the plate body 121 are both embedded in the notch 111a, the circumferential wall 111 includes a first side wall 111c and a second side wall 111d, the first side wall 111c and the second side wall 111d are both facing the first side X1, the first side wall 111c and the second side wall 111d are spaced apart to define a portion of the notch 111a, and the folded edge 122 seals and connects the first side wall 111c and the second side wall 111d.

[0130] The folded edge 122 and the plate body 121 are both embedded in the notch 111 a, which means that the folded edge 122 and the plate body 121 are both embedded in the notch 111 a.

[0131] In this embodiment, the folded edge 122 and the plate body 121 are both embedded in the notch 111a, and the folded edge 122 and the plate body 121 may not protrude from the surface of the circumferential wall 111, so that the folded edge 122 is installed in cooperation with the second box body 14, and the surface flatness of the box body assembly 1 is better. The folded edge 122 is sealed to connect the first side wall 111c and the second side wall 111d, so that the folded edge 122, the first side wall 111c and the second side wall 111d are all connected to the second box body 14, thereby improving the waterproof and dustproof performance of the box body assembly 1.

[0132] As an example, the folded edge 122 and the plate body 121 can both seal and connect the circumferential wall 111 to form a portion of the notch 111 a .

[0133] The folded edge 122 and the plate body 121 are both sealed and connected to the portion of the circumferential wall 111 forming the notch 111a, which means that there is no gap between the folded edge 122 and the portion of the circumferential wall 111 forming the notch 111a, and there is no gap between the plate body 121 and the portion of the circumferential wall 111 forming the notch 111a, and both the folded edge 122 and the plate body 121 can seal and close the notch 111a.

[0134] In this embodiment, the folded edge 122 and the plate body 121 are both embedded in the notch 111a, and the folded edge 122 and the plate body 121 may not protrude from the surface of the circumferential wall 111, so that the folded edge 122 and the second box body 14 can be installed in coordination, and the surface flatness of the box assembly 1 is better. The folded edge 122 and the plate body 121 are both sealed and connected to the portion of the circumferential wall 111 forming the notch 111a, thereby improving the waterproof and dustproof performance of the box assembly 1.

[0135] For example, in some embodiments, the folded edge 122 and the plate body 121 may be welded to the portion of the circumferential wall 111 forming the notch 111 a to achieve a sealed connection.

[0136] In the embodiments of the present application, the specific type of welding is not limited. By way of example, welding includes but is not limited to cold metal transfer welding (Cold Metal Transfer, CMT) or laser welding, etc.

[0137] For example, in some embodiments, the folded edge 122 and the plate body 121 may be bonded to the portion of the circumferential wall 111 forming the notch 111 a to achieve a sealed connection.

[0138] For example, in some embodiments, the folded edge 122 and the plate body 121 can be sealed with the first seal at the position where the notch 111a is formed with the circumferential wall 111. The gap between the folded edge 122 and the plate body 121 and the wall surface of the notch 111a is sealed by elastic deformation of the first seal.

[0139] The material of the first sealing member is not limited. For example, the first sealing member may be made of a flexible material, which refers to a material that can be stretched and / or bent and can recover. For example, the first sealing member may be made of silicone, rubber and / or foam.

[0140] For some examples, see Figures 2 to 7The first box body 11 includes a guard plate 112, and the circumferential wall 111 is disposed on the first side X1 of the guard plate 112 to define a placement groove 11a. The thickness direction of the guard plate 112 can be consistent with the first direction X, and the guard plate 112 can support the battery cell. The panel 12 can be sealed and connected to the guard plate 112, for example, one end of the plate body 121 facing the second side X2 can be welded to the guard plate 112.

[0141] For some examples, see Figures 2 to 7 The circumferential wall 111 includes a first side beam 1111, the first side beam 1111 includes a first beam body 11111 and a second beam body 11112, the first beam body 11111 and the second beam body 11112 are spaced apart along the second direction Y to form a notch 111a, the two ends of the folded edge 122 along the second direction Y are respectively sealed and connected to the first beam body 11111 and the second beam body 11112, and the two ends of the plate body 121 along the second direction Y are respectively sealed and connected to the first beam body 11111 and the second beam body 11112. The first beam body 11111 and the second beam body 11112 can be metal profiles. The first direction X is perpendicular to the second direction Y.

[0142] As an example, two ends of the folded edge 122 along the second direction Y are respectively welded to the first beam body 11111 and the second beam body 11112 to achieve a sealed connection.

[0143] As an example, two ends of the plate body 121 along the second direction Y are respectively welded to the first beam body 11111 and the second beam body 11112 to achieve a sealed connection.

[0144] In this embodiment, compared with metal profiles, the panel 12 is a sheet metal structure, the structure of the panel 12 is simpler, and it is easier to set a hole on the panel 12 to install the electrical connector 2. The first beam 11111 and the second beam 11112 are metal profiles, and the first beam 11111 and the second beam 11112 may have a cavity inside, which can provide a buffering function to improve the anti-collision performance of the box assembly 1.

[0145] For some examples, see Figures 2 to 7 The circumferential wall 111 includes a second side beam 1112 and two third side beams 1113. The first side beam 1111 and the second side beam 1112 are arranged at intervals along the third direction Z, and the two third side beams 1113 are arranged at intervals along the second direction Y. The first side beam 1111, the second side beam 1112 and the two third side beams 1113 together constitute the circumferential wall 111. The circumferential wall 111 is generally annular in structure and surrounds the battery cell. The second side beam 1112 and the third side beam 1113 can also be metal profiles. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0146] In this embodiment, the second side beam 1112 and the third side beam 1113 are metal profiles, and the second side beam 1112 and the third side beam 1113 may have cavities inside, and the cavities may provide a buffering function to improve the anti-collision performance of the box assembly 1.

[0147] For some examples, see Figures 2 to 8 The box assembly 1 includes a rivet nut 13 , a mounting hole 12 a is formed on the panel 12 , the rivet nut 13 is riveted to the mounting hole 12 a , and the fastener 10 is passed through the electrical connector 2 and is threadedly connected to the rivet nut 13 .

[0148] Specifically, the rivet nut 13 has an internal thread, the fastener 10 has an external thread, and the external thread of the fastener 10 is threadably matched with the internal thread of the rivet nut 13 .

[0149] The riveting of the rivet nut 13 and the mounting hole 12 a means that one of the rivet nut 13 and the panel 12 undergoes plastic deformation, so that the rivet nut 13 is firmly connected to the mounting hole 12 a .

[0150] For example, the rivet nut 13 may be riveted to the mounting hole 12 a first, the electrical connector 2 may be fastened to the rivet nut 13 by the fastener 10 , and then the panel 12 may be assembled to the first box body 11 .

[0151] In this embodiment, the rivet nut 13 is riveted to the mounting hole 12a, which not only allows the rivet nut 13 and the panel 12 to be quickly assembled, avoiding the risk of thread slipping of the steel wire sleeve in the related art, but also enhances the sealing between the rivet nut 13 and the panel 12. The fastener 10 is threadedly connected to the rivet nut 13, and the electrical connector 2 can be detachably connected to the panel 12, so as to facilitate the disassembly and assembly of the electrical connector 2.

[0152] The fastener 10 includes, but is not limited to, a screw or a bolt.

[0153] In some embodiments, the rivet nut 13 is a compression rivet nut, an expansion rivet nut, or a pull rivet nut.

[0154] Under the action of external pressure, the panel 12 undergoes plastic deformation so that part of the rivet nut is squeezed into the mounting hole 12a.

[0155] Under the action of external expansion force, the part of the expansion rivet nut located in the mounting hole 12a expands and plastically deforms to press against the wall surface of the mounting hole 12a.

[0156] The rivet nut is partially plastically deformed under the action of external tension, and the surrounding area of ​​the mounting hole 12a is clamped by the plastically deformed area.

[0157] In this embodiment, the rivet nut 13 can be one of a compression rivet nut, an expansion rivet nut and a pull rivet nut, which has good processability, a simple installation method of the rivet nut 13 and the panel 12, and good durability.

[0158] For some examples, see Figure 7 and Figure 8 The rivet nut includes a threaded portion 131, a flange 132, a toothed portion 133 and a positioning portion 134. The threaded portion 131 forms an internal thread. The positioning portion 134 is connected to one axial end of the threaded portion 131. The flange 132 and the toothed portion 133 are both surrounded by the outer circumference of the threaded portion 131. The toothed portion 133 is located on a side of the flange 132 close to the positioning portion 134. The outer diameters of the flange 132, the toothed portion 133 and the positioning portion 134 decrease successively.

[0159] The outer diameter of the positioning portion 134 can be smaller than the diameter of the mounting hole 12a. During the assembly process of the rivet nut and the mounting hole 12a, the positioning portion 134 can be inserted into the mounting hole 12a first to play a pre-positioning role. Under the action of external pressure, the panel 12 undergoes plastic deformation so that the toothed portion 133 can be squeezed into the mounting hole 12a. The toothed portion 133 and the mounting hole 12a are tightly matched to achieve the riveting of the rivet nut and the mounting hole 12a. The outer diameter of the flange 132 is larger than the outer diameter of the toothed portion 133, which can play a role in limiting the installation in place.

[0160] For some examples, see Figures 2 to 8 At least two mounting holes 12a surround the electrical connector 2, and each mounting hole 12a is correspondingly provided with a rivet nut 13. The connection stability between the electrical connector 2 and the panel 12 is improved by the plurality of rivet nuts 13 and the plurality of fasteners 10.

[0161] For some examples, see Figures 2 to 8 , four mounting holes 12a surround the electrical connector 2, and each mounting hole 12a corresponds to a rivet nut 13 and a fastener 10. In this way, the electrical connector 2 can be fixed from four directions, and the installation reliability is high.

[0162] For some examples, see Figure 4 and Figure 7 The panel 12 forms a socket 12 b, and a portion of the electrical connector 2 is inserted into the socket 12 b.

[0163] As an example, see Figure 7 , the insertion hole 12b is formed in the plate body 121.

[0164] In this embodiment, the insertion hole 12 b not only facilitates the positioning and installation of the electrical connector 2 to the panel 12 , but also reduces the degree to which the electrical connector 2 protrudes from the panel 12 .

[0165] In some embodiments, the battery device 100 includes a second sealing member, which seals the gap between the electrical connector 2 and the wall of the insertion hole 12b. The gap between the electrical connector 2 and the wall of the insertion hole 12b is sealed by elastic deformation of the second sealing member.

[0166] The material of the second sealing member is not limited. For example, the second sealing member can be made of a flexible material, which refers to a material that can be stretched and / or bent and can recover. For example, the second sealing member can be made of silicone, rubber and / or foam.

[0167] For some examples, see Figure 4 and Figure 7 The panel 12 forms a threading hole 12c, and the guide wire of the electrical connector 2 is passed through the threading hole 12c.

[0168] As an example, see Figure 7 , a threading hole 12c is formed in the plate body 121.

[0169] In this embodiment, the guide wire of the electrical connector 2 can pass through the threading hole 12c and enter the placement groove 11a, so as to be connected with other devices in the placement groove 11a.

[0170] It can be understood that the conductive wire is used to achieve circuit conduction, and the conductive wire can also be called a wire, an electric wire, or an electrical trace, etc.

[0171] In some embodiments, the battery device 100 includes a third sealing member, which seals the gap between the guide wire and the wall of the threading hole 12c. The gap between the guide wire and the wall of the threading hole 12c is sealed by elastic deformation of the third sealing member.

[0172] The material of the third sealing member is not limited. For example, the third sealing member can be made of a flexible material, which refers to a material that can be stretched and / or bent and can recover. For example, the third sealing member can be made of silicone, rubber and / or foam.

[0173] In some embodiments, the panel 12 and the circumferential wall 111 are welded by cold metal transfer welding. Cold metal transfer welding is a type of welding without slag splashing, which can reduce slag residue as much as possible and improve the welding quality of the panel 12 and the circumferential wall 111.

[0174] In a specific embodiment, please refer to Figures 2 to 8The box assembly 1 includes a first box 11 and a panel 12. The first box 11 has a placement groove 11a opened toward a first side X1 in a first direction X. The panel 12 is a sheet metal structure. The panel 12 includes a plate body 121 and a folded edge 122. The plate body 121 and the folded edge 122 are formed by bending a metal plate by a bending machine. The circumferential wall 111 forms a notch 111a. The folded edge 122 and the plate body 121 are both embedded in the notch 111a. The folded edge 122 and the plate body 121 can be welded to the portion of the circumferential wall 111 forming the notch 111a to achieve a sealed connection. The panel 12 forms a mounting hole 12a, and the rivet nut 13 can be a self-sealing nut, which includes a threaded portion 131, a flange 132, a toothed portion 133 and a positioning portion 134. The threaded portion 131 forms an internal thread, and the positioning portion 134 is connected to an axial end of the threaded portion 131. The flange 132 and the toothed portion 133 are both surrounded by the outer periphery of the threaded portion 131, and the toothed portion 133 is located on the side of the flange 132 close to the positioning portion 134. The outer diameters of the flange 132, the toothed portion 133 and the positioning portion 134 decrease successively. The outer diameter of the positioning portion 134 can be smaller than the diameter of the mounting hole 12a. During the assembly process of the rivet nut and the mounting hole 12a, the positioning portion 134 can be first inserted into the mounting hole 12a to play a role of pre-positioning. Under the action of external pressure, the panel 12 undergoes plastic deformation so that the toothed portion 133 can be squeezed into the mounting hole 12a. The toothed portion 133 is tightly matched with the mounting hole 12a to achieve riveting of the rivet nut and the mounting hole 12a.

[0175] In this embodiment, compared with metal profiles, the panel 12 is a sheet metal structure, and the structure of the panel 12 is simpler, and it is easier to set the mounting hole 12a on the panel 12 to install the electrical connector 2. The rivet nut is riveted with the mounting hole 12a, which can not only quickly assemble the rivet nut 13 and the panel 12, avoiding the risk of slipping of the steel wire thread sleeve in the related art, but also enhance the sealing between the rivet nut and the panel 12. The fastener 10 is threadedly connected with the threaded portion 131, and the electrical connector 2 can be detachably connected to the panel 12, so as to facilitate the disassembly and assembly of the electrical connector 2. The outer diameter of the flange 132 is larger than the outer diameter of the toothed portion 133, which can play a role in limiting the installation in place.

[0176] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery device, characterized in that: include: The box assembly comprises a first box and a panel, wherein the first box has a placement groove opening toward a first side in a first direction, and the panel is a sheet metal structure, and the panel is arranged on a circumferential wall of the first box surrounding the first direction; A battery cell, wherein the battery cell is arranged in the placement groove; An electrical connector is disposed on the panel.

2. The battery device according to claim 1, characterized in that: The circumferential wall forms a notch, the panel seals and closes the notch, and the circumferential surface of the panel is flush with the circumferential surface of the circumferential wall.

3. The battery device according to claim 1, characterized in that: The panel includes a plate body and a folded edge, wherein the folded edge is bent from one end of the plate body along a first side toward the placement groove, and the electrical connector is arranged on the plate body.

4. The battery device according to claim 3, characterized in that: The circumferential wall forms a notch, the folded edge and the plate body are both embedded in the notch, the circumferential wall includes a first side wall and a second side wall, the first side wall and the second side wall are both facing the first side, the first side wall and the second side wall are spaced apart to define part of the notch, and the folded edge seals and connects the first side wall and the second side wall.

5. The battery device according to claim 1, characterized in that: The box assembly includes a rivet nut, the panel forms a mounting hole, the rivet nut is riveted to the mounting hole, and a fastener is passed through the electrical connector and is threadedly connected to the rivet nut.

6. The battery device according to claim 5, characterized in that: The rivet nut is a compression rivet nut, an expansion rivet nut or a pull rivet nut.

7. The battery device according to claim 5, characterized in that: At least two of the mounting holes surround the electrical connector, and each of the mounting holes is correspondingly provided with a rivet nut.

8. The battery device according to any one of claims 1 to 7, characterized in that: The panel forms a socket, and part of the electrical connector is inserted into the socket.

9. The battery device according to any one of claims 1 to 7, characterized in that: The panel forms a threading hole, and the guide wire of the electrical connector is passed through the threading hole.

10. The battery device according to any one of claims 1 to 7, characterized in that: The box assembly includes a second box, the second box closes the opening of the placement slot toward the first side, the panel forms a first connecting hole, the circumferential wall forms a second connecting hole, some connecting parts are inserted through the second box and the first connecting hole, and some connecting parts are inserted through the second box and the second connecting hole.

11. The battery device according to any one of claims 1 to 7, characterized in that: The panel and the circumferential wall are welded by cold metal transfer.

12. A box assembly, characterized in that: It comprises a first box body and a panel, wherein the first box body has a placement groove which is open on a first side facing a first direction, and the panel is a sheet metal structure, and the panel is arranged on a circumferential wall of the first box body surrounding the first direction.

13. An electrical equipment, characterized in that: A battery device comprising any one of claims 1 to 11, wherein the battery device is used to store or provide electrical energy.

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