Battery device and electric device

Abstract

The embodiment of the invention provides a battery device and a power utilization device. The battery device comprises a box body, a battery management system and a battery monomer, the box body is provided with an electrical bin and a battery bin which are arranged in the first direction, the box body comprises a first wall, a second wall and a third wall, the second wall and the third wall are both arranged opposite to the first wall in the second direction, the electrical bin is formed between the first wall and the second wall, the battery bin is formed between the first wall and the third wall, and the second wall is closer to the first wall than the third wall. The second direction is perpendicular to the first direction. And the battery management system is accommodated in the electrical cabin. And the battery monomers are accommodated in the battery compartment and are electrically connected with the battery management system. The battery management system comprises a box body and an electrical part, the box body is provided with a containing space and an opening which are communicated with each other, the second wall covers the opening, and the electrical part is contained in the containing space and connected to the second wall. According to the battery device, the space utilization rate of the battery device can be improved.

Description

Technical Field

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

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

[0003] Battery devices are widely used in portable electronic devices, electric vehicles, power tools, drones, energy storage devices, and other fields. During their use, the space utilization of battery devices is a critical issue. Therefore, improving the space utilization of battery devices is a pressing technical challenge in battery technology. Summary of the Invention

[0004] The embodiments of the present application provide a battery device and an electrical device, which can improve the space utilization of the battery device.

[0005] In the first aspect, an embodiment of the present application provides a battery device, comprising a box body, a battery management system and a battery cell; the box body has an electrical compartment and a battery compartment arranged along a first direction, the box body includes a first wall, a second wall and a third wall, along the second direction, the second wall and the third wall are arranged opposite to the first wall, the electrical compartment is formed between the first wall and the second wall, the battery compartment is formed between the first wall and the third wall, the second wall is closer to the first wall than the third wall, and the second direction is perpendicular to the first direction; the battery management system is accommodated in the electrical compartment; the battery cell is accommodated in the battery compartment and is electrically connected to the battery management system; wherein the battery management system includes a box body and electrical components, the box body has a accommodating space and an opening that are interconnected, the second wall covers the opening, the electrical components are accommodated in the accommodating space and are connected to the second wall.

[0006] In the above technical solution, by arranging the second wall closer to the first wall than the third wall, the size of the electrical compartment along the second direction is smaller than the size of the battery compartment along the second direction, thereby reducing the space occupied by the electrical compartment. By arranging the electrical components to be connected to the second wall and accommodated within the storage space of the box body, the box body can have a smaller size along the second direction, thereby reducing the space occupied by the battery management system along the second direction. This allows for a smaller distance between the second wall and the first wall, further reducing the space occupied by the electrical compartment and improving the space utilization of the battery device.

[0007] In some embodiments, the third wall has a first surface facing away from the first wall, and along the second direction, the minimum distance between the second wall and the first surface is 50mm-100mm. Along the second direction, the minimum distance between the second wall and the first surface is greater than or equal to 50mm, which can enable the side of the second wall facing away from the electrical compartment to have a larger redundant space, which is beneficial to the arrangement of other components and reduces the difficulty of setting up other components; the minimum distance between the second wall and the first surface is less than or equal to 100mm, which can enable the electrical compartment to have a larger space, which is beneficial to the arrangement of components such as the battery management system and reduces the difficulty of setting up the battery management system; therefore, the minimum distance between the second wall and the first surface is 50mm-100mm, which can reduce the difficulty of setting up components on both sides of the second wall and improve the space utilization of the battery device.

[0008] In some embodiments, the battery management system includes a connection terminal and a conductive harness; the connection terminal is electrically connected to the electrical component; the conductive harness is connected to the connection terminal, and the conductive harness is at least partially embedded in the wall of the box. By embedding at least part of the conductive harness in the wall of the box, the box and the conductive harness share a portion of the height space, which helps reduce the size of the box along the second direction, thereby allowing a smaller distance between the second wall and the first wall, which helps reduce the space occupied by the electrical compartment and improve the space utilization of the battery device.

[0009] In some embodiments, the electrical component includes a relay electrically connected to the connection terminal. At least one of the relay's dimensions along the first direction and along the third direction is greater than the relay's dimension along the second direction. The first, second, and third directions are perpendicular to each other. This reduces the relay's dimension along the second direction, minimizing the relay's impact on the enclosure's dimension along the second direction. This further reduces the enclosure's dimension along the second direction, further reducing the space occupied by the electrical compartment, and improving the battery device's space utilization.

[0010] In some embodiments, the first wall is provided with an access opening that communicates with the electrical compartment. The housing also includes an access cover that covers the access opening and is removably connected to the first wall. By connecting the housing and electrical components to the second wall, the battery management system in the second wall can be directly accessed through the access opening in the first wall, simplifying maintenance of the battery management system. The removable connection of the access cover to the first wall allows for easy access to components within the electrical compartment by simply removing the access cover, thus simplifying maintenance.

[0011] In some embodiments, the housing includes a frame, and the first, second, and third walls are all connected to the frame. The first wall includes a first portion and a second portion, an electrical compartment is formed between the first portion and the second wall, a battery compartment is formed between the second portion and the third wall, and an access port is provided in the first portion. The first portion is detachably connected to the frame. By detachably connecting the first portion to the frame, components within the electrical compartment can be replaced by removing the first portion, thereby reducing maintenance difficulty.

[0012] In some embodiments, the housing includes a frame, and the first, second, and third walls are all connected to the frame; the first wall includes a first portion and a second portion, the electrical compartment is formed between the first portion and the second wall, the battery compartment is formed between the second portion and the third wall, and the inspection port is provided in the first portion; the second portion is detachably connected to the frame. By detachably connecting the second portion to the frame, the battery compartment can be inspected and maintained by removing the second portion, thereby reducing the difficulty of maintaining the battery compartment.

[0013] In some embodiments, the housing further includes a bottom guard plate connected to the first wall and located on a side of the first wall facing away from the second wall. The bottom guard plate's projection along the second direction covers at least a portion of the electrical compartment. This bottom guard plate enhances the strength of the first wall, reduces the risk of damage to the electrical compartment caused by damage to the first wall, and improves the reliability of the battery assembly.

[0014] In some embodiments, the projection of the bottom guard plate along the second direction completely covers the electrical compartment, thereby further reducing the risk of components in the electrical compartment being damaged by external forces and improving the reliability of the battery device.

[0015] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery device as provided in any embodiment of the first aspect.

[0016] In some embodiments, the electrical device further includes a power distribution module, which is disposed on a surface of the second wall facing away from the first wall along a second direction, and is electrically connected to the battery device. By disposing the power distribution module on a surface of the second wall facing away from the first wall along a second direction, on the one hand, the space utilization rate of the battery device can be improved, space waste of the battery device can be reduced, and the layout structure of the electrical device can be optimized. On the other hand, the close distance between the power distribution module and the battery device can shorten the path of the wiring harness connecting the power distribution module and the battery device, reducing energy consumption and reducing electromagnetic interference caused by the power distribution module on other components of the electrical device.

[0017] In some embodiments, the third wall has a first surface facing away from the first wall, and the power distribution module does not protrude from the first surface along the direction from the first wall to the second wall. This reduces the risk of interference between the power distribution module and other components of the electrical device, thereby improving the structural stability of the power distribution module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application; Figure 2 A schematic structural diagram of a battery device provided in some embodiments of the present application; Figure 3 for Figure 2 AA cross-sectional view; Figure 4 for Figure 3 A partial enlarged view of the middle B area; Figure 5 An exploded view of a battery device provided in some embodiments of the present application; Figure 6 An exploded diagram of a battery management system provided in some embodiments of the present application; Figure 7 A partial schematic diagram of a battery management system provided in some embodiments of the present application; Figure 8 An exploded view of a battery device provided in some other embodiments of the present application; Figure 9 A schematic structural diagram of a vehicle provided in accordance with some further embodiments of the present application.

[0020] Icons: 1-box; 1a-electrical compartment; 1b-battery compartment; 11-first wall; 111-inspection port; 112-first part; 113-second part; 12-second wall; 121-first outer surface; 13-third wall; 131-first surface; 14-partition wall; 15-inspection cover; 16-frame; 17-bottom guard plate; 2-battery management system; 21-box; 211-opening; 212-accommodating space; 22-electrical parts; 221-relay; 23-connecting terminal; 24-conductive wiring harness; 3-battery cell; 10-battery device; 20-controller; 30-motor; 40-distribution module; 100-vehicle; X-first direction; Z-second direction; Y-third direction. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0022] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0023] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0025] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0026] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0027] The term "plurality" used in this application refers to two or more (including two).

[0028] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0029] Battery cells include but are not limited to lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0030] A battery cell typically includes an electrode assembly. This assembly consists of a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, reduces the risk of short circuits while allowing the active ions to pass through.

[0031] In some embodiments, the positive electrode may be a positive electrode sheet, which 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.

[0032] 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 provided on either or both of the two facing surfaces of the positive electrode current collector.

[0033] As an example, the positive electrode current collector can be a foil or a composite current collector. For example, the foil can be made of silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, or titanium. A composite current collector can include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys) on a polymer substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0034] 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 battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. 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 0.3 O2 (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 0.85 Co 0.15 Al 0.05 O2)) and at least one of its modified compounds, etc.

[0035] In some embodiments, the positive electrode may be a metal foam or carbon foam. The metal foam may be nickel foam, copper foam, aluminum foam, or alloy foam, among others. When the metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0036] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0037] As examples, the negative electrode current collector can be a foil, metal foam, or a composite current collector. For example, the foil can be silver-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, or titanium. Metal foams can include nickel foam, copper foam, aluminum foam, or alloy foam. A composite current collector can include a polymer base layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys) onto a polymer substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0038] 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.

[0039] 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 provided on either or both of the two facing surfaces of the negative electrode current collector.

[0040] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well 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 batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0041] 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.

[0042] In some embodiments, the separator is a separator membrane, which can be any known porous separator membrane with good chemical and mechanical stability.

[0043] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0044] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0045] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0046] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0047] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl 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, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may 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.

[0048] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0049] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0050] As an example, the polymer solid electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, etc.

[0051] As an example, the inorganic solid electrolyte may include 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.

[0052] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0053] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0054] In some embodiments, the electrode assembly is a laminate structure.

[0055] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0056] 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.

[0057] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0058] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0059] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0060] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0061] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0062] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0063] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal prismatic batteries. Polygonal prismatic batteries are, for example, hexagonal prismatic batteries.

[0064] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0065] In some embodiments, the battery device may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0066] In some embodiments, the battery device may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0067] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0068] In some embodiments, the battery device may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0069] A battery system may include a battery compartment for holding battery cells and an electrical compartment for housing a battery management system. In a battery system, the height of the battery compartment is limited by the height occupied by the battery cells, while the height of the electrical compartment is limited by the height occupied by the battery management system. However, the height of the battery management system can lead to wasted space in the electrical compartment, affecting the space utilization of the battery system.

[0070] In view of this, in order to improve the space utilization of the battery device, an embodiment of the present application provides a battery device, including a box body, a battery management system and a battery cell. The box body has an electrical compartment and a battery compartment arranged along a first direction, and the box body includes a first wall, a second wall and a third wall. Along the second direction, the second wall and the third wall are arranged opposite to the first wall. The electrical compartment is formed between the first wall and the second wall, and the battery compartment is formed between the first wall and the third wall. The second wall is closer to the first wall than the third wall, and the second direction is perpendicular to the first direction. The battery management system is accommodated in the electrical compartment. The battery cell is accommodated in the battery compartment and is electrically connected to the battery management system. Among them, the battery management system includes a box body and electrical components, the box body has a accommodating space and an opening that are interconnected, the second wall covers the opening, the electrical components are accommodated in the accommodating space, and are connected to the second wall.

[0071] In such a battery device, by setting the second wall closer to the first wall than the third wall, the size of the electrical compartment along the second direction is smaller than the size of the battery compartment along the second direction, thereby reducing the space occupied by the electrical compartment. By setting the electrical components to be connected to the second wall and accommodated in the accommodating space of the box body, the box body can have a smaller size along the second direction, thereby reducing the space occupied by the battery management system along the second direction, and allowing a smaller distance to be set between the second wall and the first wall, further reducing the space occupied by the electrical compartment and improving the space utilization rate of the battery device. In addition, along the second direction, the area of ​​the second wall that is closer to the first wall than the third wall on the side facing away from the electrical compartment can form a redundant space, and other components can be installed in the redundant space to further reduce the space waste of the battery device and improve the space utilization rate of the battery device.

[0072] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using battery devices.

[0073] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be fuel-powered, gas-powered, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include aircraft, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0074] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0075] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 100 provided in some embodiments of the present application. A battery device 10 is disposed within the vehicle 100. The battery device 10 can be located at the bottom, front, or rear of the vehicle 100. The battery device 10 can be used to power the vehicle 100. For example, the battery device 10 can serve as the operating power source of the vehicle 100.

[0076] The vehicle 100 may further include a controller 20 and a motor 30 . The controller 20 is used to control the battery device 10 to supply power to the motor 30 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 100 .

[0077] In some embodiments of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 100, but also serve as a driving power source for the vehicle 100, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100.

[0078] Please refer to Figure 2-Figure 7 , Figure 2 A schematic structural diagram of a battery device 10 provided in some embodiments of the present application; Figure 3 for Figure 2 AA section view; Figure 4 for Figure 3 A partial enlarged view of the middle B area; Figure 5 An exploded view of a battery device 10 provided in some embodiments of the present application; Figure 6 An exploded diagram of a battery management system 2 provided in some embodiments of the present application; Figure 7A partial schematic diagram of a battery management system 2 provided for some embodiments of the present application. An embodiment of the present application provides a battery device 10, comprising a housing 1, a battery management system 2, and battery cells 3. The housing 1 has an electrical compartment 1a and a battery compartment 1b arranged along a first direction X. The housing 1 comprises a first wall 11, a second wall 12, and a third wall 13. Along a second direction Z, the second wall 12 and the third wall 13 are both arranged opposite to the first wall 11. The electrical compartment 1a is formed between the first wall 11 and the second wall 12, and the battery compartment 1b is formed between the first wall 11 and the third wall 13. The second wall 12 is closer to the first wall 11 than the third wall 13. The second direction Z is perpendicular to the first direction X. The battery management system 2 is accommodated in the electrical compartment 1a. The battery cells 3 are accommodated in the battery compartment 1b and are electrically connected to the battery management system 2. The battery management system 2 includes a box body 21 and an electrical component 22 . The box body 21 has an accommodating space 212 and an opening 211 that are interconnected. The second wall 12 covers the opening 211 . The electrical component 22 is accommodated in the accommodating space 212 and connected to the second wall 12 .

[0079] The box body 1 may include a partition wall 14, which separates the electrical compartment 1a from the battery compartment 1b. The partition wall 14 may be an expansion beam.

[0080] The battery management system 2 is electrically connected to the battery cells 3 and is used to obtain parameter information of the battery cells 3 and manage the input or output of electrical energy of the battery cells 3. The parameter information of the battery cells 3 may be the temperature, voltage, etc. of the battery cells 3 in the battery device 10.

[0081] The battery management system 2 can be connected to the first wall 11 or the second wall 12. The battery cells 3 can be connected to the first wall 11 or the third wall 13. For example, the battery management system 2 is connected to the second wall 12, and the first wall 11 supports the battery cells 3.

[0082] The second wall 12 and the third wall 13 are located on the same side of the first wall 11 along the second direction Z. The electrical compartment 1a is formed between the first wall 11 and the second wall 12 so that the first wall 11 and the second wall 12 are disposed opposite each other along the second direction Z. The battery compartment 1b is formed between the first wall 11 and the third wall 13 so that the first wall 11 and the third wall 13 are disposed opposite each other along the second direction Z. It will be understood that the surface of the second wall 12 facing away from the first wall 11 and the surface of the third wall 13 facing away from the first wall 11 are both part of the outer surface of the box body 1.

[0083] The second wall 12 has a first outer surface 121 that faces away from the first wall 11 along the second direction Z. The first outer surface 121 is the surface of the second wall 12 farthest from the first wall 11. Along the second direction Z, the distance between the first outer surface 121 and the first wall 11 is less than the minimum distance between the third wall 13 and the first wall 11, so that the second wall 12 is closer to the first wall 11 than the third wall 13.

[0084] The third wall 13 has a first surface 131 facing away from the first wall 11. Along the second direction Z, a redundant space is formed between the first outer surface 121 and the first surface 131. The redundant space is located outside the battery device 10. The redundant space can be used to accommodate other components of the vehicle 100. For example, the redundant space can be used to install the power distribution module 40 of the vehicle 100.

[0085] The box body 21 is a hollow structure with one side open. The open side of the box body 21 forms an opening 211. When the box body 21 is mounted on the second wall 12, the opening 211 of the box body 21 is snapped onto the surface of the second wall 12 facing the first wall 11 and connected, so that the second wall 12 covers the opening 211. The box body 21 and the second wall 12 can be connected by adhesive bonding, snap-fitting, or fasteners. The fasteners can be bolts.

[0086] The electrical component 22 is accommodated in the accommodation space 212, so that the electrical component 22 is integrated into the box body 21. The electrical component 22 can be one or more, and can include a relay, a fuse, a current sensor, a control board, etc. The electrical component 22 can be bonded, clipped, or connected to the second wall 12 using fasteners. The fasteners can be bolts.

[0087] In the embodiment of the present application, by arranging the second wall 12 closer to the first wall 11 than the third wall 13, the size of the electrical compartment 1a along the second direction Z is smaller than the size of the battery compartment 1b along the second direction Z, thereby reducing the space occupied by the electrical compartment 1a. By arranging the electrical components 22 connected to the second wall 12 and accommodated within the accommodating space 212 of the box body 21, the box body 21 can have a smaller size along the second direction Z, thereby reducing the space occupied by the battery management system 2 along the second direction Z. This allows for a smaller distance between the second wall 12 and the first wall 11, further reducing the space occupied by the electrical compartment 1a and improving the space utilization of the battery device 10. In addition, along the second direction Z, the area on the side of the second wall 12 facing away from the electrical compartment 1a that is closer to the first wall 11 than the third wall 13 forms redundant space, which can be used to install other components, further reducing space waste in the battery device 10 and improving the space utilization of the battery device 10.

[0088] In some embodiments, please refer to Figure 2-Figure 5The third wall 13 has a first surface 131 facing away from the first wall 11 , and along the second direction Z, a minimum distance between the second wall 12 and the first surface 131 is 50 mm-100 mm.

[0089] The second wall 12 has a first outer surface 121 facing away from the first wall 11 . The first outer surface 121 is the surface of the second wall 12 farthest from the first wall 11 . The distance between the first outer surface 121 and the first surface 131 along the second direction Z is the minimum distance between the second wall 12 and the first surface 131 .

[0090] The minimum distance between the second wall 12 and the first surface 131 is L, and L can be any one of 50mm, 52mm, 54mm, 56mm, 58mm, 60mm, 62mm, 64mm, 66mm, 68mm, 70mm, 72mm, 74mm, 76mm, 78mm, 80mm, 82mm, 84mm, 86mm, 88mm, 90mm, 92mm, 94mm, 96mm, 98mm, 100mm or any value between any two of them.

[0091] In this embodiment, along the second direction Z, the minimum distance between the second wall 12 and the third wall 13 is greater than or equal to 50 mm, which can enable the side of the second wall 12 away from the electrical compartment 1a to have a larger redundant space, which is conducive to the arrangement of other components and reduces the difficulty of setting up other components; the minimum distance between the second wall 12 and the third wall 13 is less than or equal to 100 mm, which can enable the electrical compartment 1a to have a larger space, which is conducive to the arrangement of components such as the battery management system 2 and reduces the difficulty of setting up the battery management system 2; therefore, the minimum distance between the second wall 12 and the third wall 13 is 50 mm-100 mm, which can reduce the difficulty of setting up components on both sides of the second wall 12 and improve the space utilization of the battery device 10.

[0092] In some embodiments, please refer to Figure 6 and Figure 7 The battery management system 2 further includes a connection terminal 23 and a conductive wire harness 24 . The connection terminal 23 is electrically connected to the electrical component 22 . The conductive wire harness 24 is connected to the connection terminal 23 and is at least partially embedded in the wall of the box body 21 .

[0093] The connection terminal 23 may be directly connected to the electrical component 22 to achieve electrical connection between the connection terminal 23 and the electrical component 22 ; or the connection terminal 23 may be connected to the electrical component 22 through a wire to achieve electrical connection between the connection terminal 23 and the electrical component 22 .

[0094] The conductive wire harness 24 may be connected to the plurality of connection terminals 23, which in turn may be connected to the plurality of electrical components 22, thereby electrically connecting the plurality of electrical components 22 within the housing 21. The battery management system 2 may further include an external connector. The conductive wire harness 24 may be connected to the connection terminals 23 and the external connector, which may be connected to the electrical components 22, thereby electrically connecting the electrical components 22 to the external connector. The external connector may be connected to an external device outside the battery device 10 or other electrical components within the battery device 10.

[0095] The conductive wire bundle 24 may be entirely embedded in the wall of the box body 21 ; or only a portion of the conductive wire bundle 24 may be embedded in the wall of the box body 21 , and the other portion may be located outside the box body 21 or in the accommodating space 212 .

[0096] In this embodiment, by burying at least part of the conductive wire bundle 24 in the wall of the box body 21, the box body 21 and the conductive wire bundle 24 can share a part of the height space, which is beneficial to reducing the size of the box body 21 along the second direction Z, so that a smaller distance can be set between the second wall 12 and the first wall 11, which is beneficial to reducing the space occupied by the electrical compartment 1a and improving the space utilization of the battery device 10.

[0097] In some embodiments, please refer to Figure 6 and Figure 7 The electrical component 22 includes a relay 221 , which is electrically connected to the connection terminal 23 . At least one of the dimensions of the relay 221 along the first direction X and the dimensions along the third direction Y is greater than the dimension of the relay 221 along the second direction Z. The first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0098] The relay 221 is electrically connected to the connection terminal 23 , so that the relay 221 can be electrically connected to components such as the control board and the output pole of the battery device 10 through the connection terminal 23 and the conductive harness 24 .

[0099] The size of the relay 221 along the first direction X and the size along the third direction Y may both be larger than the size of the relay 221 along the second direction Z; the size of the relay 221 along the first direction X may be larger than the size of the relay 221 along the second direction Z, and the size of the relay 221 along the third direction Y may be smaller than the size of the relay 221 along the second direction Z; or the size of the relay 221 along the third direction Y may be larger than the size of the relay 221 along the second direction Z, and the size of the relay 221 along the first direction X may be smaller than the size of the relay 221 along the second direction Z.

[0100] In this embodiment, the size of the relay 221 along the second direction Z can be reduced, and the influence of the relay 221 on the size of the box body 21 along the second direction Z can be reduced, which is conducive to further reducing the size of the box body 21 along the second direction Z, further reducing the space occupied by the electrical compartment 1a, and improving the space utilization of the battery device 10.

[0101] In some embodiments, the relay 221 may include a coil and a trigger mechanism. The coil being energized or de-energized can drive the trigger mechanism to connect or disconnect the output circuit of the battery device 10. The relay 221 may be constructed without a housing, with the coil exposed within the housing 21. The housing 21 secures the coil and insulates the coil from the exterior of the housing 21.

[0102] In some embodiments, please refer to Figure 8 , Figure 8 This is an exploded view of a battery device 10 according to yet another embodiment of the present application. The battery management system 2 is mounted on the second wall 12. The first wall 11 is provided with an access opening 111, which communicates with the electrical compartment 1a. The housing 1 also includes an access cover 15, which covers the access opening 111 and is detachably connected to the first wall 11.

[0103] The battery management system 2 on the second wall 12 can be inspected through the inspection opening 111 on the first wall 11. When the battery device 10 is in normal use, the inspection opening 111 is closed by covering it with the inspection cover 15, thereby reducing the risk of debris entering the electrical compartment 1a.

[0104] The number of inspection openings 111 may be one or more. In an embodiment where there are multiple inspection openings 111, one inspection cover 15 may be provided for each inspection opening 111, with one inspection cover 15 covering one inspection opening 111; or one inspection cover 15 may be provided for multiple inspection openings 111, with one inspection cover 15 covering multiple inspection openings 111.

[0105] The inspection cover 15 can be connected to the first wall 11 by snapping, pinning, or fasteners, so as to achieve a detachable connection between the inspection cover 15 and the first wall 11. The fasteners can be bolts.

[0106] In this embodiment, by arranging the battery management system 2 on the second wall 12, the battery management system 2 on the second wall 12 can be directly inspected through the inspection port 111 on the first wall 11, thereby reducing the difficulty of maintaining the battery management system 2. By providing an inspection cover 15 that is detachably connected to the first wall 11, when inspecting components in the electrical compartment 1a, only the inspection cover 15 needs to be removed to inspect the components in the electrical compartment 1a, thereby reducing the difficulty of maintaining the electrical compartment 1a. When the battery device 10 is installed at the bottom of the vehicle 100, the first wall 11 can serve as the bottom wall of the battery device 10. In this way, compared to disassembling the entire battery device 10 for inspection, inspecting the battery management system 2 by removing the inspection cover 15 simplifies the maintenance steps and reduces the difficulty of inspection.

[0107] In some embodiments, please refer to Figure 8 The housing 1 includes a frame 16, to which the first wall 11, the second wall 12, and the third wall 13 are all connected. The first wall 11 includes a first portion 112 and a second portion 113. The electrical compartment 1a is formed between the first portion 112 and the second wall 12, and the battery compartment 1b is formed between the second portion 113 and the third wall 13. The inspection port 111 is provided in the first portion 112. The first portion 112 is detachably connected to the frame 16.

[0108] The frame 16 is disposed around the periphery of the electrical compartment 1 a and the battery compartment 1 b . In the embodiment where the battery device 10 includes the partition wall 14 , the frame 16 may include the partition wall 14 .

[0109] The second wall 12 can be connected to the frame 16 by welding, bonding, clamping or fasteners. Exemplarily, the second wall 12 and the frame 16 are connected by friction welding.

[0110] The third wall 13 can be welded, bonded, clamped or fastened to the frame 16. Exemplarily, the third wall 13 and the frame 16 are connected by bolts.

[0111] In a projection plane perpendicular to the second direction Z, the orthographic projection of the first portion 112 covers the electrical compartment 1a, and the orthographic projection of the second portion 113 covers the battery compartment 1b. The first portion 112 and the second portion 113 can be directly connected or connected through an intermediate component. For example, the first portion 112 and the second portion 113 are connected by a transition portion, and the transition portion and the partition wall 14 are stacked along the second direction Z.

[0112] The first portion 112 and the second portion 113 can be integrally formed or separately provided and connected. In an embodiment where the first portion 112 and the second portion 113 are integrally formed, the first portion 112 and the second portion 113 are both detachably connected to the frame 16. In an embodiment where the first portion 112 and the second portion 113 are separately provided and connected, the first portion 112 and the second portion 113 are detachably connected.

[0113] The first portion 112 can be connected to the frame 16 by snapping, pinning or fasteners, wherein the fasteners can be bolts.

[0114] In this embodiment, by providing a detachable connection between the first part 112 and the frame 16, the components in the electrical compartment 1a can be replaced by removing the first part 112, which helps to reduce the difficulty of maintaining the electrical compartment 1a.

[0115] In some embodiments, a sealing gasket is provided between the third wall 13 and the frame 16 , and the sealing gasket is used to seal the connection position between the third wall 13 and the frame 16 to achieve sealing of the battery compartment 1 b .

[0116] In some embodiments, the second portion 113 is detachably connected to the frame 16 .

[0117] The second portion 113 can be connected to the frame 16 by snapping, pinning or fastening members, wherein the fastening members can be bolts.

[0118] In this embodiment, by providing a detachable connection between the second portion 113 and the frame 16 , the battery compartment 1 b can be inspected and maintained by removing the second portion 113 , which helps to reduce the difficulty of maintaining the battery compartment 1 b.

[0119] In some embodiments, please refer to Figure 8 The box body 1 further includes a bottom guard plate 17, which is connected to the first wall 11 and located on the side of the first wall 11 away from the second wall 12. The projection of the bottom guard plate 17 along the second direction Z covers at least a portion of the electrical compartment 1a.

[0120] The bottom guard plate 17 is connected to the first wall 11 by snap connection, pin connection or fasteners, wherein the fasteners can be bolts.

[0121] In a projection plane perpendicular to the second direction Z, the orthographic projection of the bottom guard plate 17 may cover the entire electrical compartment 1a, or may cover a portion of the electrical compartment 1a. The orthographic projection of the bottom guard plate 17 may cover only at least a portion of the electrical compartment 1a, or may cover at least a portion of both the electrical compartment 1a and the battery compartment 1b.

[0122] In this embodiment, the bottom guard plate 17 can enhance the strength of the first wall 11 , reduce the risk of damage to the first wall 11 causing partial damage to the electrical compartment 1 a , and improve the reliability of the battery device 10 .

[0123] In some embodiments, please refer to Figure 8 The projection of the bottom guard plate 17 along the second direction Z completely covers the electrical compartment 1 a.

[0124] In the projection plane of the second direction Z, the orthographic projection of the bottom guard plate 17 may only cover the electrical compartment 1a; or the orthographic projection of the bottom guard plate 17 may cover at least a portion of the battery compartment 1b and the electrical compartment 1a.

[0125] In this embodiment, the risk of components in the electrical compartment 1 a being damaged by external forces can be further reduced, thereby improving the reliability of the battery device 10 .

[0126] An embodiment of the present application provides a vehicle 100 , comprising a battery device 10 as provided in any one of the above embodiments.

[0127] In some embodiments, please refer to Figure 9 , Figure 9 The vehicle 100 further includes a power distribution module 40 , which is disposed on a surface of the second wall 12 facing away from the first wall 11 along the second direction Z and is electrically connected to the battery device 10 .

[0128] The power distribution module 40 and the battery management system 2 may both be disposed on the second wall 12. The electrical components in the electrical compartment 1a and the power distribution module 40 share the second wall 12 to save installation space.

[0129] The power distribution module 40 can be connected to the first wall 11 by snap connection, pin connection or fasteners, wherein the fasteners can be bolts.

[0130] In this embodiment, by arranging the power distribution module 40 on the surface of the second wall 12 facing away from the first wall 11 along the second direction Z, the space utilization of the battery assembly 10 is improved, space waste of the battery assembly 10 is reduced, and the layout structure of the vehicle 100 is optimized. Furthermore, the close distance between the power distribution module 40 and the battery assembly 10 shortens the path of the wiring harness connecting the power distribution module 40 and the battery assembly 10, reducing energy consumption and electromagnetic interference from the power distribution module 40 to other components of the vehicle 100.

[0131] In some embodiments, please refer to Figure 9 The third wall 13 has a first surface 131 facing away from the first wall 11 , and the power distribution module 40 does not protrude from the first surface 131 along a direction from the first wall 11 to the second wall 12 .

[0132] The surface of the second wall 12 facing away from the electrical compartment 1 a is the first outer surface 121 . Along the second direction Z, a redundant space is formed between the first surface 131 and the first outer surface 121 , and the power distribution module 40 is accommodated in the redundant space.

[0133] In this embodiment, the power distribution module 40 does not protrude from the first surface 131 , which can reduce the risk of interference between the power distribution module 40 and other components of the vehicle 100 and improve the structural stability of the power distribution module 40 .

[0134] Please refer to Figure 2-Figure 8 . An embodiment of the present application provides a battery device 10, including a case 1, a battery management system 2 and a battery cell 3. The case 1 has an electrical compartment 1a and a battery compartment 1b arranged along a first direction X. The battery management system 2 is accommodated in the electrical compartment 1a, and the battery management system 2 includes a case 21, an electrical component 22, a connecting terminal 23 and a conductive wiring harness 24. The case 21 has a accommodating space 212. The electrical component 22 is accommodated in the accommodating space 212. The connecting terminal 23 is electrically connected to the electrical component 22. The conductive wiring harness 24 is connected to the connecting terminal 23, and the conductive wiring harness 24 is at least partially buried in the wall of the case 21. The battery cell 3 is accommodated in the battery compartment 1b and is electrically connected to the battery management system 2. The housing 1 includes a first wall 11, a second wall 12, and a third wall 13. Both the second wall 12 and the third wall 13 are disposed opposite the first wall 11 along a second direction Z. The electrical compartment 1a is formed between the first and second walls 11, and the battery compartment 1b is formed between the first and third walls 11, 13. The second wall 12 is closer to the first wall 11 than the third wall 13. The third wall 13 has a first surface 131 facing away from the first wall 11. Along the second direction Z, the minimum distance between the second wall 12 and the first surface 131 is 50 mm to 100 mm. The electrical component 22 includes a relay 221 electrically connected to the connection terminal 23. At least one of the dimensions of the relay 221 along the first direction X and the dimension along the third direction Y is greater than the dimension of the relay 221 along the second direction Z. The first, second, and third directions Y are perpendicular to each other. The battery management system 2 is disposed in the second wall 12. The first wall 11 is provided with an access port 111, which communicates with the electrical compartment 1a. The housing 1 further includes an inspection cover 15, which is disposed over the inspection opening 111 and is detachably connected to the first wall 11. The housing 1 further includes a bottom guard plate 17, which is connected to the first wall 11 and is located on a side of the first wall 11 facing away from the second wall 12. The projection of the bottom guard plate 17 along the second direction Z covers at least a portion of the electrical compartment 1a.

[0135] In this battery device 10, by positioning the second wall 12 closer to the first wall 11 than the third wall 13 along the second direction Z, the size of the electrical compartment 1a along the second direction Z is smaller than that of the battery compartment 1b along the second direction Z. This reduces the impact of the size of the battery cells 3 on the size of the electrical compartment 1a, reduces the space occupied by the electrical compartment 1a, and improves the space utilization of the electrical compartment 1a, thereby improving the space utilization of the battery device 10. Furthermore, along the second direction Z, the area of ​​the second wall 12 facing away from the electrical compartment 1a, which is closer to the first wall 11 than the third wall 13, creates redundant space, which can be used to install other components, further reducing space waste in the battery device 10 and improving its space utilization. By embedding at least a portion of the conductive wiring harness 24 within the wall of the case 21, the case 21 and the conductive wiring harness 24 share a portion of the height space, which helps reduce the size of the case 21 along the second direction Z. This allows for a smaller distance between the second wall 12 and the first wall 11, further reducing the space occupied by the electrical compartment 1a and improving the space utilization of the battery device 10. The relay 221 has a smaller size along the second direction Z, reducing its impact on the size of the housing 21 along the second direction Z. This helps further reduce the size of the housing 21 along the second direction Z, further reducing the space occupied by the electrical compartment 1a and improving the space utilization of the battery assembly 10. When the battery assembly 10 is installed on the bottom of the vehicle 100, the first wall 11 can serve as the bottom wall of the battery assembly 10. This simplifies maintenance procedures and reduces the difficulty of repairs by removing the inspection cover 15, compared to disassembling the entire battery assembly 10 for inspection. The bottom guard plate 17 enhances the strength of the first wall 11, reducing the risk of damage to the electrical compartment 1a caused by damage to the first wall 11, and improving the reliability of the battery assembly 10.

[0136] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0137] The above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit this application. Those skilled in the art will appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application are intended to be within the scope of protection of this application.

Claims

1. A battery device, characterized in that: include: A box body having an electrical compartment and a battery compartment arranged along a first direction, the box body including a first wall, a second wall, and a third wall. Along a second direction, the second wall and the third wall are both arranged opposite to the first wall. The electrical compartment is formed between the first wall and the second wall, and the battery compartment is formed between the first wall and the third wall. The second wall is closer to the first wall than the third wall. The second direction is perpendicular to the first direction. A battery management system is housed in the electrical compartment; A battery cell is housed in the battery compartment and electrically connected to the battery management system; The battery management system includes a box body and electrical components. The box body has a receiving space and an opening that are interconnected. The second wall covers the opening. The electrical components are received in the receiving space and connected to the second wall.

2. The battery device according to claim 1, wherein: The third wall has a first surface facing away from the first wall, and along the second direction, a minimum distance between the second wall and the first surface is 50 mm-100 mm.

3. The battery device according to claim 1, wherein: The battery management system further includes: a connecting terminal, electrically connected to the electrical component; A conductive wire harness is connected to the connecting terminal, and the conductive wire harness is at least partially buried in the wall of the box body.

4. The battery device according to claim 3, wherein: The electrical component includes a relay, which is electrically connected to the connecting terminal. At least one of the dimensions of the relay along the first direction and the dimensions along the third direction is larger than the dimension of the relay along the second direction. The first direction, the second direction and the third direction are perpendicular to each other.

5. The battery device according to any one of claims 1 to 4, characterized in that The first wall is provided with an inspection port, and the inspection port is communicated with the electrical compartment; The box body further includes an inspection cover, which is arranged on the inspection opening and is detachably connected to the first wall.

6. The battery device according to claim 5, wherein: The box body includes a frame, and the first wall, the second wall, and the third wall are all connected to the frame; the first wall includes a first portion and a second portion, the electrical compartment is formed between the first portion and the second wall, the battery compartment is formed between the second portion and the third wall, and the inspection port is provided in the first portion; The first part is detachably connected to the frame, and / or the second part is detachably connected to the frame.

7. The battery device according to any one of claims 1 to 4, characterized in that The box body also includes a bottom guard plate, which is connected to the first wall and located on a side of the first wall away from the second wall. The projection of the bottom guard plate along the second direction covers at least a portion of the electrical compartment.

8. The battery device according to claim 7, wherein: The projection of the bottom guard plate along the second direction completely covers the electrical compartment.

9. An electrical device, characterized in that: A battery device comprising the battery device according to any one of claims 1 to 8.

10. The electrical device according to claim 9, wherein: The power-consuming device further includes a power distribution module, which is disposed on a surface of the second wall away from the first wall along the second direction, and is electrically connected to the battery device.

11. The electrical device according to claim 10, wherein: The third wall has a first surface facing away from the first wall, and the power distribution module does not protrude from the first surface along a direction from the first wall to the second wall.

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