Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, the battery device comprises a main box, the main box defines a containing cavity with an open top, the main box comprises a steel plate layer and an aluminum plate layer which are stacked in the thickness direction, and the aluminum plate layer is arranged on one side, facing the containing cavity, of the steel plate layer; and the battery monomers are arranged in the accommodating cavities. According to the technical scheme, the main box comprises the aluminum plate layer and the steel plate layer which are arranged in a stacked mode, the aluminum plate layer is arranged on the side, facing the containing cavity, of the steel plate layer, the steel plate layer can improve the structural strength of the main box, the aluminum plate layer can improve the heat dissipation efficiency of the single batteries, and the probability of local overheating in the battery device is reduced; and the energy density of the battery device is improved.

Description

Technical Field

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

[0002] In the related art, the box of the battery device is heavy and the performance of the box needs to be improved. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a battery device and an electrical device including the battery device, wherein the main box structure of the battery device is strong and has good heat dissipation performance, and the energy density of the battery device is increased.

[0004] In the first aspect, an embodiment of the present application provides a battery device, comprising: a main box, the main box defining a accommodating cavity with an open top, the main box including steel plate layers and aluminum plate layers stacked in the thickness direction, the aluminum plate layer being arranged on the side of the steel plate layer facing the accommodating cavity; and a battery cell, the battery cell being arranged in the accommodating cavity.

[0005] In the above technical solution, the main box includes stacked aluminum plate layers and steel plate layers, and the aluminum plate layer is arranged on the side of the steel plate layer facing the accommodating cavity. The steel plate layer can improve the structural strength of the main box, and the aluminum plate layer can improve the heat dissipation efficiency of the battery cell, reduce the probability of local overheating inside the battery device, and improve the energy density of the battery device.

[0006] In some embodiments, the main box is integrally stamped from a steel-aluminum composite panel.

[0007] In the above technical solution, the main box is integrally stamped from a steel-aluminum composite plate, which can improve the production efficiency of the main box, reduce the difficulty of assembling the main box, and reduce production costs.

[0008] In some embodiments, the battery device also includes: a heat exchange plate, which is an aluminum plate. The heat exchange plate is arranged in the accommodating cavity and is brazed to the aluminum plate layer. The heat exchange plate and the bottom wall of the main box cooperate to define a heat exchange flow channel, and the battery cell is arranged on the upper side of the heat exchange plate.

[0009] In the above technical solution, the heat exchange plate is brazed to the bottom wall of the main box and cooperates with the bottom wall of the main box to define a heat exchange flow channel. This can not only improve the assembly efficiency and connection strength between the heat exchange plate and the main box, reduce the number of parts, compact the structure of the battery device, and improve the energy density, but also improve the heat exchange efficiency between the heat exchange fluid and the battery cell, so that the battery cell operates stably.

[0010] In some embodiments, a heat exchange channel that bends and extends and has an open top is formed on the bottom wall of the main box, and the heat exchange plate is a flat plate and covers the open top side of the heat exchange channel.

[0011] In the above technical solution, the bottom wall of the main box forms a heat exchange channel with an open top, the heat exchange plate is a flat plate and covers the heat exchange channel, and the heat exchange channel is bent and extended. On the one hand, it can increase the flow path of the heat exchange channel and improve the heat exchange efficiency. On the other hand, it can simplify the structure of the heat exchange plate, and it can be convenient to stamp the heat exchange channel into one piece when stamping the main box, thereby reducing the processing steps, improving the processing efficiency, and reducing the processing cost.

[0012] In some embodiments, the battery device also includes: a mounting beam, which extends along a first direction and is arranged on both sides of the main box in a second direction. The mounting beam is arranged outside the accommodating cavity and is welded to the main box. The battery device is suitable for being installed on an electrical device through the mounting beam.

[0013] In the above technical solution, by setting up a mounting beam for installing the battery device and welding the mounting beam to the main box, the connection strength between the mounting beam and the main box can be improved, and the assembly efficiency can be improved. The mounting beam can also play a role in supporting the main box, improving the structural strength of the main box, and facilitating the assembly of the battery device and the electrical device.

[0014] In some embodiments, the mounting beam includes a first plate and a second plate located below the first plate, the first plate and the second plate are stacked and connected in the up and down directions, and both the first plate and the second plate are connected to the main box.

[0015] In the above technical solution, the mounting beam includes a first plate and a second plate arranged up and down, and the first plate and the second plate are fixedly connected to the main box. On the one hand, it can simplify the structure of the mounting beam and facilitate the processing and forming of the mounting beam. On the other hand, it can improve the connection reliability between the mounting beam and the main box.

[0016] In some embodiments, a first folded edge extending upward is provided on one side edge of the first plate in the second direction, and the first folded edge is fitted and fixedly connected to the main box. A second folded edge extending downward is provided on one side edge of the second plate in the second direction, and the second folded edge is fitted and fixedly connected to the main box.

[0017] In the above technical solution, the first plate is adhered to and fixedly connected to the main box through the first folded edge, and the second plate is adhered to and fixedly connected to the main box through the second folded edge, which can increase the connection area between the first plate and the second plate and the main box, and improve the connection reliability and stability between the first plate and the second plate and the main box.

[0018] In some embodiments, a third folded edge is provided at the lower end of the second folded edge and extends along the second direction toward the main box, and the third folded edge is in contact with and fixedly connected to the bottom wall of the main box.

[0019] In the above technical solution, the third fold is connected to the lower end of the second fold and is fixed to the bottom wall of the main box, which can further increase the overlap area between the second plate and the main box, further improve the connection reliability between the second plate and the main box, and the third fold can also support the main box on the lower side of the main box, thereby improving the structural strength of the main box.

[0020] In some embodiments, the first plate is formed with a plurality of first reinforcing protrusions protruding upward, and the plurality of first reinforcing protrusions are arranged at intervals along the first direction; the second plate is formed with a plurality of second reinforcing protrusions protruding downward, and the plurality of second reinforcing protrusions are arranged at intervals along the first direction; the plurality of first reinforcing protrusions correspond one-to-one to the plurality of second reinforcing protrusions and are opposite to each other up and down.

[0021] In the above technical solution, a plurality of first reinforcing protrusions and a plurality of second reinforcing protrusions are formed on the first plate and the second plate respectively, and the first reinforcing protrusions and the second reinforcing protrusions are opposite to each other up and down, which can respectively improve the structural strength of the first plate and the second plate, improve the overall structural strength of the mounting beam, and improve the stability and reliability of the battery device when installed through the mounting beam.

[0022] In some embodiments, the mounting beam also includes a mounting column, which extends vertically and passes through the first reinforcing protrusion and the second reinforcing protrusion in sequence and is fixed to the first reinforcing protrusion and the second reinforcing protrusion. The mounting column is formed with a mounting hole extending up and down, and the battery device is suitable for being fixed to the electrical device by fasteners passing through the mounting hole.

[0023] In the above technical solution, a mounting column with a mounting hole is provided on the mounting beam, and the mounting column is fixed at the position of the first reinforcing protrusion and the second reinforcing protrusion. The mounting column can not only improve the structural strength of the mounting beam, but also protect and support the fasteners passed through the mounting hole, thereby improving the connection reliability between the battery device and the electrical device.

[0024] In some embodiments, the battery device further includes: a reinforcing plate, which is disposed in the accommodating cavity, fixedly connected to both side walls of the main box in the second direction, and opposite to the inside and outside of the first folding edge and / or the second folding edge.

[0025] In the above technical solution, a reinforcing plate is provided on the inner side of the main box, which is opposite to the first folding edge and the second folding edge inside and outside, thereby improving the structural strength of the connection position between the main box and the first folding edge and the second folding edge, and improving the connection reliability between the main box and the mounting beam.

[0026] In some embodiments, the reinforcement plate includes a first reinforcement section and a second reinforcement section, the first reinforcement section is fixed to the side wall of the main box, the second reinforcement section is connected to the lower end of the first reinforcement section and extends along the second direction, and the second reinforcement section is fitted with and fixedly connected to the bottom wall of the main box.

[0027] In the above technical solution, the reinforcement plate can not only strengthen the structural strength of the side wall of the main box through the first reinforcement section, but also strengthen the structural strength of the bottom wall of the main box through the second reinforcement section, thereby further improving the structural strength of the main box and improving the connection reliability between the main box and the mounting beam.

[0028] In some embodiments, the first folded edge, the side wall of the main box and the reinforcing plate are welded together.

[0029] In the above technical solution, the first folded edge, the main box and the reinforcement plate are welded together, which can improve the welding efficiency between the first folded edge, the main box and the reinforcement plate and enhance the integrity of the mounting beam, the main box and the reinforcement plate.

[0030] In some embodiments, the battery device further includes: an expansion beam, which is disposed in the accommodating cavity and is welded to the main box.

[0031] In the above technical solution, the expansion beam can enhance the structural strength of the main box and improve the main box's ability to resist deformation. The expansion beam can also play a role in heat conduction and improve the heat dissipation performance of the battery cell. In addition, the expansion beam is welded to the main box, which can improve assembly efficiency, reduce the number of parts, and reduce costs.

[0032] In some embodiments, the battery device also includes: a connecting bracket, which is arranged on the outside of the main box and fixedly connected to the main box; a bottom guard plate, which is arranged on the lower side of the main box and connected to the main box through the connecting bracket.

[0033] In the above technical solution, the bottom guard plate is fixedly connected to the main box through a connecting bracket, which can facilitate the connection between the bottom guard plate and the main box. In addition, the bottom guard plate and the connecting bracket can improve the overall structural strength of the battery device and enhance the reliability of the battery device.

[0034] In some embodiments, the connecting bracket includes: a main support plate, which is arranged on the lower side of the bottom wall of the main box, and at least one lug is formed on the edge of the main support plate, and the lug protrudes from the periphery of the bottom wall of the main box; an inclined support plate, which includes a first section, an inclined section and a second section connected in sequence, the first section is a horizontal plate body, and is arranged on the upper side of the lug and fixedly connected to the lug, the second section is a plate body extending up and down, and is in contact with and fixedly connected to the side wall of the main box, and in the direction from the first section to the second section, the inclined section extends upward.

[0035] In the above technical solution, the main support plate can play a role in structural reinforcement of the bottom wall of the main box, improve the overall structural strength of the battery device, increase the contact area with the main box, and improve the reliability of the fixed connection to the bottom guard plate. At the same time, the inclined support plate can cooperate with the lugs of the main support plate and the side walls of the main box to form a triangular stable connection structure, which can further enhance the structural reinforcement effect of the connecting bracket on the main box and improve the connection reliability between the connecting bracket and the main box.

[0036] In some embodiments, the first section is welded to the side wall of the main box.

[0037] In the above technical solution, the first section is connected to the side wall of the main box by welding, which can improve the connection reliability between the first section and the main box and improve the assembly efficiency.

[0038] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery device according to the first aspect of the present application.

[0039] In the above technical solution, since the electrical device is provided with the above-mentioned battery device, and the main box of the battery device includes stacked aluminum plate layers and steel plate layers, and the aluminum plate layer is arranged on the side of the steel plate layer facing the accommodating cavity, the steel plate layer can improve the structural strength of the main box, and the aluminum plate layer can improve the heat dissipation efficiency of the battery cell, reduce the probability of local overheating inside the battery device, and increase the energy density of the battery device, thereby improving the overall performance of the electrical device.

[0040] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic diagram of a vehicle according to an embodiment of the present application;

[0042] Figure 2 A schematic diagram of a battery device provided in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of a battery device provided in an embodiment of the present application from another angle;

[0044] Figure 4 An exploded diagram of the structure of a battery device provided in an embodiment of the present application;

[0045] Figure 5 is a schematic diagram of a main box of a battery device according to an embodiment of the present application;

[0046] Figure 6 is a schematic diagram of a heat exchange plate of a battery device according to an embodiment of the present application;

[0047] Figure 7 is a schematic diagram of a main box and a heat exchange plate of a battery device according to an embodiment of the present application;

[0048] Figure 8 It is along Figure 7 Cross-sectional view along line AA;

[0049] Figure 9 It is along Figure 7Cross-sectional view along the midline BB;

[0050] Figure 10 A schematic diagram of a battery device (excluding battery cells) provided according to an embodiment of the present application;

[0051] Figure 11 It is along Figure 10 Cross-sectional view along the mid-CC line;

[0052] Figure 12 is a partial enlarged view of the mounting beam of the battery device provided in an embodiment of the present application;

[0053] Figure 13 It is along Figure 10 Cross-sectional view along the mid-DD line;

[0054] Figure 14 It is along Figure 10 Cross-sectional view along line EE.

[0055] Reference numerals:

[0056] 1. Electrical devices;

[0057] 1000, battery device; 2000, controller; 3000, motor;

[0058] 100. Main box; 101. Accommodation chamber; 102. Heat exchange channel;

[0059] 110, steel plate layer; 120, aluminum plate layer;

[0060] 200, battery cell; 300, heat exchange plate;

[0061] 400, install beams;

[0062] 410, first plate; 411, first folded edge; 412, first reinforcing protrusion; 4121, first groove;

[0063] 420, second plate; 421, second folded edge; 422, third folded edge; 423, second reinforcing protrusion; 4231, second groove; 4232, leakage hole;

[0064] 430, mounting column; 431, mounting hole;

[0065] 500, reinforcement plate; 510, first reinforcement section; 520, second reinforcement section;

[0066] 600, expansion beam; 610, first beam plate; 620, second beam plate; 630, reinforcement beam plate; 601, beam cavity;

[0067] 700, connecting bracket; 710, main support plate; 711, lug; 720, oblique support plate; 721, first section; 722, inclined section; 723, second section;

[0068] 800, protective sheet; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0069] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0070] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0071] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0072] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present 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. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0073] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0074] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two).

[0075] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0076] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0077] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0078] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include one or more battery cells. When there are multiple battery cells, the multiple battery cells are connected in series, parallel, or hybrid via a busbar.

[0079] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is a battery module formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0080] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0081] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0082] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0083] As an example, the housing may include a first housing and a second housing. The first housing and the second housing engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0084] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0085] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0086] In some embodiments, the battery device refers to an energy storage device, which includes a box with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0087] The battery cells mentioned in the embodiments of this application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. The battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0088] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0089] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0090] In recent years, new energy vehicles have experienced rapid development. In this field, batteries, as the power source of electric vehicles, play an irreplaceable and important role. As core components of new energy vehicles, batteries have high requirements in terms of energy density and reliability.

[0091] In the related art, the box of the battery device is heavy and has low heat conduction efficiency, which affects the energy density of the battery device and the heat dissipation performance of the battery cells.

[0092] Based on the above considerations, in order to improve the heat conduction efficiency of the box, reduce the weight of the box, and increase the energy density while ensuring the structural strength of the box, a battery device is designed. The main box of the battery device includes stacked aluminum plate layers and steel plate layers. The aluminum plate layer is arranged on the side of the steel plate layer facing the accommodating cavity of the main box. The steel plate layer can improve the structural strength of the main box, and the aluminum plate layer improves the heat dissipation efficiency of the battery cell, reduces the probability of local overheating inside the battery device, and improves the energy density of the battery device.

[0093] The present application provides an electrical device that uses the battery device of the present disclosure as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, and the like. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0094] For the convenience of description, the following embodiments take the electric device 1 as a vehicle as an example to introduce the structures of the electric device 1 and the battery device 1000 of the present application in detail.

[0095] Please refer to Figure 1 , Figure 1The power-consuming device 1 provided for some embodiments of the present application is a structural diagram of a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle is provided with a battery device 1000, and the battery device 1000 can be arranged at the bottom, head or tail of the vehicle. The battery device 1000 can be used to power the vehicle, for example, the battery device 1000 can be used as an operating power source for the vehicle. The vehicle may also include a controller 2000 and a motor 3000, and the controller 2000 is used to control the battery device 1000 to power the motor 3000, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery device 1000 can not only serve as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0096] Reference below Figure 2-Figure 14 A battery device 1000 according to an embodiment of the first aspect of the present application is described.

[0097] Please refer to Figure 2-Figure 4 , Figure 2 A schematic diagram of a battery device 1000 provided in some embodiments of the present application; Figure 3 A schematic diagram of the battery device 1000 provided in an embodiment of the present application from another angle; Figure 4 The battery device 1000 provided in some embodiments of the present application is an exploded view of the structure. The battery device 1000 includes a main box 100 and a plurality of battery cells 200. The main box 100 is used to provide an assembly space for the battery cells 200, and the battery cells 200 are accommodated in the box. Figure 5 is a schematic diagram of a main box 100 of a battery device 1000 according to an embodiment of the present application; Figure 6 is a schematic diagram of a heat exchange plate 300 of a battery device 1000 according to an embodiment of the present application; Figure 7 1 is a schematic diagram of a main box 100 and a heat exchange plate 300 of a battery device 1000 according to an embodiment of the present application; Figure 8 It is along Figure 7 Cross-sectional view along line AA; Figure 9 It is along Figure 7 Cross-sectional view along the midline BB; Figure 10 A schematic diagram of a battery device 1000 (excluding battery cells 200) provided according to an embodiment of the present application; Figure 11 It is along Figure 10 Cross-sectional view along the mid-CC line; Figure 12 is a partial enlarged view of the mounting beam 400 of the battery device 1000 provided in an embodiment of the present application; Figure 13 It is along Figure 10 Cross-sectional view along the mid-DD line; Figure 14 It is along Figure 10Cross-sectional view along line EE.

[0098] For ease of description, the length direction of the main box 100 is set as the first direction X, the width direction of the main box 100 is set as the second direction Y, and the height direction of the main box 100, that is, the up-down direction, is set as the third direction Z. The first direction X, the second direction Y, and the third direction Z intersect with each other.

[0099] It should be noted that the third direction Z intersects the first direction X and the second direction Y in pairs, which means that: the first direction X and the second direction Y are arranged at an angle, and the angle between the first direction X and the second direction Y is greater than 0° and less than 180°. For example, the first direction X and the second direction Y may be arranged at an angle of 30°, 60°, 90°, 120°, or 150°; the third direction Z is arranged at an angle to the first direction X, and the angle between the third direction Z and the first direction X is greater than 0° and less than 180°. For example, the third direction Z and the first direction X may be arranged at an angle of 30°, 60°, 90°, 120°, or 150°; the third direction Z is arranged at an angle to the second direction Y, and the angle between the third direction Z and the second direction Y is greater than 0° and less than 180°. For example, the third direction Z and the second direction Y may be arranged at an angle of 30°, 60°, 90°, 120°, or 150°.

[0100] In a specific example, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other, and the first direction X is the left-right direction, the second direction Y is the front-back direction, and the third direction Z is the up-down direction.

[0101] The embodiment of the present application proposes a battery device 1000, such as Figure 2-Figure 4 As shown, the battery device 1000 includes: a main box 100 and a battery cell 200, the main box 100 defines a accommodating cavity 101 with an open top, the main box 100 includes a steel plate layer 110 and an aluminum plate layer 120 stacked in the thickness direction, the aluminum plate layer 120 is arranged on the side of the steel plate layer 110 facing the accommodating cavity 101; the battery cell 200 is arranged in the accommodating cavity 101.

[0102] The main box 100 may be in the shape of a rectangular parallelepiped box with an open top. The main box 100 defines a receiving cavity 101 for providing a space for arranging the battery cells 200 and other components of the battery device 1000 .

[0103] The main box 100 is a metal component, manufactured from sheet metal. It includes an aluminum plate layer 120 and a steel plate layer 110 arranged inside and outside. Specifically, the aluminum plate layer 120 is formed into a rectangular box with an open top, and the steel plate layer 110 is also formed into a box with an open top, with the steel plate layer 110 covering the outside of the aluminum plate layer 120.

[0104] Among them, the steel plate layer 110 has high structural strength and corrosion resistance, which can improve the structural strength of the main box 100 and improve the external impact resistance of the battery device 1000. At the same time, the steel plate layer 110 has a poor conductive effect, which can reduce the probability of short circuit in the main box 100.

[0105] The aluminum plate layer 120 is arranged on the side of the steel plate layer 110 facing the accommodating cavity 101. The aluminum plate layer 120 has good thermal conductivity, which can improve the heat dissipation efficiency of the battery cells 200 in the accommodating cavity 101 and reduce the risk of local overheating in the accommodating cavity 101. At the same time, the aluminum plate layer 120 is lighter than the steel plate layer 110, which can improve the energy density of the battery device 1000.

[0106] There may be a plurality of battery cells 200 , and the plurality of battery cells 200 are stacked along the first direction X and / or the second direction Y in the accommodation cavity 101 .

[0107] In the above technical solution, the main box 100 includes an aluminum plate layer 120 and a steel plate layer 110 arranged in a stacked manner, and the aluminum plate layer 120 is arranged on the side of the steel plate layer 110 facing the accommodating cavity 101. The steel plate layer 110 can improve the structural strength of the main box 100, and the aluminum plate layer 120 can improve the heat dissipation efficiency of the battery cell 200, reduce the probability of local overheating inside the battery device 1000, and improve the energy density of the battery device 1000.

[0108] In some embodiments of the present application, Figure 4 and Figure 5 As shown, the main box 100 is integrally stamped from a steel-aluminum composite plate.

[0109] Steel-aluminum composite panels are composed of steel plate layers and aluminum plate layers. They have the advantages of high strength and high melting point of steel, as well as the good electrical conductivity, thermal conductivity, corrosion resistance and low density of aluminum.

[0110] In this embodiment, the main box 100 is formed from a steel-aluminum composite plate. This not only improves the strength and corrosion resistance of the main box 100, enhances its thermal conductivity, and reduces its weight, but also simplifies the assembly process between the steel plate layer 110 and the aluminum plate layer 120, thereby improving production efficiency. Furthermore, the integral stamping process of the main box 100 reduces the number of processing and assembly steps required, improving the processing and assembly efficiency of the main box 100 and reducing production costs.

[0111] In the above technical solution, the main box 100 is integrally stamped from a steel-aluminum composite plate, which can improve the production efficiency of the main box 100, reduce the difficulty of assembling the main box 100, and reduce the production cost.

[0112] In some embodiments of the present application, the thickness of the steel plate layer 110 is greater than or equal to 0.5 mm, and the thickness of the aluminum plate layer 120 is greater than or equal to 0.3 mm.

[0113] For example, the thickness of the steel plate layer 110 may be 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 2 mm or more, etc. For example, the thickness of the aluminum plate layer 120 may be 0.3 mm, 0.4 mm, 0.5 mm, 0.7 mm, 0.8 mm, 1 mm or more, etc.

[0114] In the above technical solution, the thickness of the steel plate layer 110 can be reasonably set according to the use environment of the battery device 1000 to ensure that the main box 100 has sufficient structural strength; the thickness of the aluminum plate layer 120 can be set according to actual design requirements, such as: the welding requirements of the aluminum plate layer 120 and other components in the main box 100 and the heat dissipation requirements of the main box 100, so as to improve the heat conduction effect of the main box 100 and enhance the assembly performance of the battery device 1000.

[0115] In some embodiments of the present application, Figure 4-Figure 9 As shown, the battery device 1000 also includes: a heat exchange plate 300, which is an aluminum plate. The heat exchange plate 300 is arranged in the accommodating cavity 101 and is brazed to the aluminum plate layer 120. The heat exchange plate 300 and the bottom wall of the main box 100 cooperate to define a heat exchange flow channel 102, and the battery cell 200 is arranged on the upper side of the heat exchange plate 300.

[0116] The heat exchange plate 300 can be a horizontally arranged flat plate. Made of aluminum, this improves heat exchange efficiency between the plate 300 and the battery cells 200 and enhances temperature uniformity across multiple battery cells 200. Furthermore, the thickness of the plate 300 can be greater than or equal to 0.5 mm. For example, the thickness of the plate 300 can be 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, and above. This ensures that the plate 300 maintains a certain level of structural strength while maintaining its thermal conductivity, effectively supporting the battery cells 200.

[0117] The heat exchange plate 300 cooperates with the bottom wall of the main box 100 to define a heat exchange channel 102. This allows the heat exchange channel 102 to be formed directly through the main box 100 and the heat exchange plate 300, eliminating the need for additional thermal management components such as cold plates or heat exchange tubes. This reduces the number of components and lowers costs. Furthermore, the fluid within the heat exchange channel 102 can directly exchange heat with the battery cells 200 through the heat exchange plate 300, further improving the heat exchange efficiency between the heat exchange fluid and the battery cells 200, reducing heat loss and enhancing heat exchange performance.

[0118] The heat exchange plate 300 is brazed to the aluminum plate layer 120 on the bottom wall of the main box 100, which can improve the connection strength between the heat exchange plate 300 and the main box 100, improve the welding efficiency between the heat exchange plate 300 and the main box 100, and improve the assembly efficiency of the battery device 1000.

[0119] The heat exchange channel 102 between the heat exchange plate 300 and the bottom wall of the main box 100 may be a heat exchange cavity, and the heat exchange channel 102 may also bend and extend between the heat exchange plate 300 and the bottom wall of the main box 100. Furthermore, a groove structure is formed on at least one of the bottom walls of the heat exchange plate 300 and the main box 100. For example, a first groove is formed on the lower surface of the heat exchange plate 300, and the upper surface of the bottom wall of the main box 100 is flat. The bottom wall of the main box 100 covers the first groove to define the heat exchange channel 102. For another example, a first groove is formed on the lower surface of the heat exchange plate 300, and a second groove is formed on the upper surface of the bottom wall of the main box 100. The first groove and the second groove are opposite to each other and connected to each other in vertical direction to define the heat exchange channel 102.

[0120] It should be noted that in the prior art, the cold plate and heat exchange tubes of the stamped box are both externally mounted, meaning they are placed outside the box. Heat exchange requires the stamped box to be exchanged, which affects heat exchange efficiency. Furthermore, since the cold plate and heat exchange tubes are placed outside the box, a bottom guard plate is required to protect them. The cold plate and box are typically connected using rivet nuts, while the bottom guard plate and box are bolted. This requires a large number of rivet nuts and bolts, resulting in a large number of parts and low assembly efficiency.

[0121] In this embodiment, the heat exchange plate 300 cooperates with the bottom wall of the main box 100 to define a heat exchange channel 102. This eliminates the need for heat transfer through the box itself, improving heat exchange efficiency. Furthermore, the heat exchange plate 300 is brazed to the main box 100, eliminating the need for rivet nuts. This simplifies the structure, reduces the number of parts, improves assembly efficiency, and lowers production costs. Furthermore, the bottom guard plate can be welded to the main box 100, further reducing the number of parts and improving assembly efficiency.

[0122] In the above technical solution, the heat exchange plate 300 is brazed to the bottom wall of the main box 100, and cooperates with the bottom wall of the main box 100 to define a heat exchange channel 102. This not only improves the assembly efficiency and connection strength between the heat exchange plate 300 and the main box 100, reduces the number of parts, compacts the structure of the battery device 1000, and improves the energy density, but also improves the heat exchange efficiency between the heat exchange fluid and the battery cell 200, so that the battery cell 200 operates stably.

[0123] In some embodiments of the present application, Figure 8 and Figure 9As shown, a heat exchange channel 102 is formed on the bottom wall of the main box 100 , which is bent and extended and has an open top. The heat exchange plate 300 is a flat plate and covers the open side of the heat exchange channel 102 .

[0124] In one example, one or more heat exchange channels 102 may be formed on the bottom wall of the main box 100. When multiple heat exchange channels 102 are provided, the channels 102 may be arranged at intervals or around each other. For example, the channels 102 may include a first channel and a second channel, with at least a portion of the first channel disposed inside the second channel. The channels 102 may be integrally stamped during the stamping of the main box 100, thereby reducing processing steps and improving processing efficiency.

[0125] The heat exchange channel 102 can include multiple straight segments and curved segments. The straight segments extend along a first direction X and are spaced apart in a second direction Y. The straight segments are sequentially connected along the fluid flow direction, and two connected straight segments are connected by a curved segment. The curved segment can have a bending angle of 180°. This not only allows the heat exchange channel 102 to extend back and forth in the first direction X, but also improves the structural strength of the bottom wall of the main box 100.

[0126] The heat exchange channel 102 may further include a first inlet and outlet section and a second inlet and outlet section. The first inlet and outlet sections both extend along the second direction Y and are spaced apart in the second direction Y. The first inlet and outlet sections are arranged on the same side of the plurality of straight segments in the first direction X and are respectively connected to the two outermost straight segments of the plurality of straight segments in the second direction Y. This facilitates the side-by-side arrangement of the inlet and outlet of the heat exchange channel 102, facilitating connection to external piping.

[0127] Furthermore, the bottom wall of the main box 100 is provided with one or more reinforcing ribs, which extend along the first direction X and are arranged between two adjacent straight line segments. This further enhances the structural strength of the bottom wall of the main box 100. Furthermore, the reinforcing ribs can be formed by downwardly protruding from the bottom wall of the main box 100, for example, by stamping.

[0128] The heat exchange plate 300 is a flat plate, which can reduce the difficulty of processing the heat exchange plate 300 and improve the processing efficiency of the heat exchange plate 300.

[0129] In the above technical solution, the bottom wall of the main box 100 forms a heat exchange channel 102 with an open top, and the heat exchange plate 300 is a flat plate and covers the heat exchange channel 102. The heat exchange channel 102 is bent and extended. On the one hand, it can increase the flow path of the heat exchange channel 102 and improve the heat exchange efficiency. On the other hand, it can simplify the structure of the heat exchange plate 300, and can facilitate the integral stamping of the heat exchange channel 102 when the main box 100 is stamped, thereby reducing the processing steps, improving the processing efficiency, and reducing the processing cost.

[0130] In some embodiments of the present application, Figure 10 and Figure 11 As shown, the battery device 1000 also includes: a mounting beam 400, which extends along the first direction X and is arranged on both sides of the main box 100 in the second direction Y. The mounting beam 400 is arranged outside the accommodating cavity 101 and is welded to the main box 100. The battery device 1000 is suitable for being installed on an electrical device through the mounting beam 400.

[0131] There are two mounting beams 400, which are arranged on opposite sides of the main box 100 respectively. The mounting beams 400 extend along the length direction of the main box 100 and extend from one end of the main box 100 in the length direction to the other end of the main box 100 in the length direction. In this way, the connection length between the mounting beam 400 and the main box 100 can be increased, and the connection strength and connection reliability between the mounting beam 400 and the main box 100 can be improved.

[0132] Furthermore, the mounting beam 400 and the main box 100 may be connected by welding. For example, the mounting beam 400 and the main box 100 may be connected by laser welding, or by resistance welding.

[0133] The mounting beam 400 can be made of steel. Since the steel plate layer 110 of the main box 100 is arranged outside the aluminum plate layer 120, when the main box 100 and the mounting beam 400 are welded, the steel plate layer 110 of the main box 100 is connected to the mounting beam 400, which can improve the welding reliability between the main box 100 and the mounting beam 400. In addition, compared with fastening connections, welding can improve the assembly efficiency between the main box 100 and the mounting beam 400, reduce the number of parts, and reduce costs.

[0134] Furthermore, the mounting beam 400 and the main box 100 can be bonded together, for example, by bonding the mounting beam 400 and the main box 100 with structural adhesive, thereby further improving the connection reliability between the mounting beam 400 and the main box 100.

[0135] In one example, the electrical device 1 may be a vehicle, and the mounting beam 400 may be detachably connected to the vehicle body. For example, the mounting beam 400 may be fastened to the vehicle body by fasteners.

[0136] In the above technical solution, by providing a mounting beam 400 for installing the battery device 1000 and welding the mounting beam 400 to the main box 100, the connection strength between the mounting beam 400 and the main box 100 can be improved, and the assembly efficiency can be improved. The mounting beam 400 can also play a role in supporting the main box 100, thereby improving the structural strength of the main box 100 and facilitating the assembly of the battery device 1000 and the electrical device 1.

[0137] In some embodiments of the present application, Figure 11 As shown, the mounting beam 400 includes a first plate 410 and a second plate 420 located below the first plate 410 . The first plate 410 and the second plate 420 are stacked and connected in the up and down directions. The first plate 410 and the second plate 420 are both fixedly connected to the main box 100 .

[0138] In one example, the length of the first plate 410 is along the first direction X and the width is along the second direction Y. The first plate 410 is a steel plate to improve the structural strength of the first plate 410. The length of the second plate 420 is along the first direction X and the width is along the second direction Y. The second plate 420 is arranged on the lower side of the first plate 410 and is fixedly connected to the first plate 410. For example, the first plate 410 and the second plate 420 can be welded, clamped, or fastened. Furthermore, the first plate 410 and the second plate 420 can be connected by resistance welding to improve the connection reliability between the first plate 410 and the second plate 420.

[0139] The first plate 410 and the second plate 420 can be fixedly connected to the main box 100 respectively to improve the connection reliability between the mounting beam 400 and the main box 100, wherein the first plate 410 and the main box 100 can be welded, snap-connected, adhesively connected and / or connected by fasteners, further, the first plate 410 and the main box 100 can be connected by resistance welding and adhesively connected; the second plate 420 and the main box 100 can be welded, snap-connected, adhesively connected and / or connected by fasteners, further, the second plate 420 and the main box 100 can be connected by resistance welding and adhesively connected.

[0140] In the above technical solution, the mounting beam 400 includes a first plate 410 and a second plate 420 arranged up and down, and the first plate 410 and the second plate 420 are both fixedly connected to the main box 100. On the one hand, it can simplify the structure of the mounting beam 400 and facilitate the processing and forming of the mounting beam 400. On the other hand, it can improve the connection reliability between the mounting beam 400 and the main box 100.

[0141] In some embodiments of the present application, Figure 11As shown, the first plate 410 has a first folded edge 411 extending upward on one side edge in the second direction Y, and the first folded edge 411 is fitted and fixedly connected to the main box 100. The second plate 420 has a second folded edge 421 extending downward on one side edge in the second direction Y, and the second folded edge 421 is fitted and fixedly connected to the main box 100.

[0142] For example, the first plate 410 includes: a first main body and a first folded edge 411, the first main body is arranged horizontally, the first folded edge 411 is connected to the edge of the side of the first main body facing the main box 100, and extends upward, wherein the first main body and the first folded edge 411 can be connected in an arc. Furthermore, and in the vertical upward direction, the first folded edge 411 extends obliquely toward the side where the first main body is located to fit with the outer surface of the side wall of the main box 100, wherein a portion of the side surface of the first folded edge 411 facing the main box 100 can fit with the main box 100, or the side surface of the first folded edge 411 facing the main box 100 can fit with the main box 100 completely.

[0143] Furthermore, the first folded edge 411 can be connected to the main box 100 by welding, adhesive connection and / or fasteners. For example, the first folded edge 411 is connected to the side wall of the main box 100 by resistance welding, and the upper and lower ends of the first folded edge 411 are adhesively connected to the side wall of the main box 100.

[0144] The second plate 420 includes a second main body and a second folded edge 421. The second main body is arranged horizontally. The second folded edge 421 is connected to the edge of the second main body facing the main box 100 and extends downward. The second main body and the second folded edge 421 can be connected in an arc. Furthermore, the surface of the second folded edge 421 facing the main box 100 can be partially in contact with the main box 100, or the surface of the second folded edge 421 facing the main box 100 can be completely in contact with the main box 100.

[0145] Furthermore, the second folded edge 421 can be connected to the main box 100 by welding, adhesive connection and / or fasteners. For example, the second folded edge 421 is connected to the side wall of the main box 100 by resistance welding, and the upper end and / or lower end edge of the second folded edge 421 can be adhesively connected to the outer surface of the main box 100.

[0146] In the above technical solution, the first plate 410 is adhered to and fixedly connected to the main box 100 through the first folded edge 411, and the second plate 420 is adhered to and fixedly connected to the main box 100 through the second folded edge 421, which can increase the fitting length between the first plate 410 and the second plate 420 and the main box 100, and improve the connection reliability and stability between the first plate 410 and the second plate 420 and the main box 100.

[0147] In some embodiments of the present application, a third folded edge 422 extending along the second direction Y toward the main box 100 is provided at the lower end of the second folded edge 421 , and the third folded edge 422 is in contact with and fixedly connected to the bottom wall of the main box 100 .

[0148] For example, the third fold edge 422 can be in the shape of a horizontal plate. The third fold edge 422 is connected to the lower end of the second fold edge 421 and extends away from the second main body along the second direction Y. The third fold edge 422 and the second fold edge 421 can be connected in an arc to reduce stress concentration at the connection position between the third fold edge 422 and the second fold edge 421. Furthermore, the third fold edge 422 and the bottom wall of the main box 100 can be welded, adhesively connected and / or connected by fasteners. For example, the third fold edge 422 is adhesively connected to the main box 100 at both ends in the second direction Y.

[0149] In the above technical solution, the third folded edge 422 is connected to the lower end of the second folded edge 421 and is fixed to the bottom wall of the main box 100, which can further increase the overlap area between the second plate 420 and the main box 100, and further improve the connection reliability between the second plate 420 and the main box 100. The third folded edge 422 can also support the main box 100 on the lower side of the main box 100, thereby improving the structural strength of the main box 100.

[0150] In some embodiments of the present application, Figure 12 As shown, the first plate 410 is formed with a plurality of first reinforcing protrusions 412 protruding upward, and the plurality of first reinforcing protrusions 412 are arranged at intervals along the first direction X. The second plate 420 is formed with a plurality of second reinforcing protrusions 423 protruding downward, and the plurality of second reinforcing protrusions 423 are arranged at intervals along the first direction X. The plurality of first reinforcing protrusions 412 correspond one-to-one to the plurality of second reinforcing protrusions 423 and are opposite to each other up and down.

[0151] The number of the first reinforcing protrusions 412 can be two, three, four, five, seven, nine, ten, or more, and the multiple first reinforcing protrusions 412 can be evenly spaced or unevenly spaced along the first direction X. The first plate 410 can be a stamped part, and the first reinforcing protrusions 412 can be formed by stamping and bending a portion of the first plate 410 upward, thereby simplifying the processing of the first plate 410. In this embodiment, the multiple first reinforcing protrusions 412 provided on the first plate 410 can improve the structural strength of the first plate 410 and enhance the support stability of the mounting beam 400 for the battery device 1000.

[0152] The number of second reinforcing protrusions 423 can be two, three, four, five, seven, nine, ten, or more, and the plurality of second reinforcing protrusions 423 can be evenly spaced or unevenly spaced along the first direction X. The second plate 420 can be a one-piece stamped and formed part, and the second reinforcing protrusions 423 can be formed by stamping and bending a portion of the second plate 420 upward, thereby simplifying the processing of the second plate 420. In this embodiment, the plurality of second reinforcing protrusions 423 provided on the second plate 420 can improve the structural strength of the second plate 420 and enhance the support stability of the mounting beam 400 for the battery device 1000.

[0153] The first reinforcing protrusion 412 and the second reinforcing protrusion 423 are opposite to each other up and down. When the first plate 410 and the second plate 420 are fixedly connected, the first reinforcing protrusion 412 and the second reinforcing protrusion 423 can jointly constitute a reinforcing beam structure of the mounting beam 400. The reinforcing beam structure can further strengthen the structural strength of the mounting beam 400 and improve the stability of the mounting beam 400 in installing the battery device 1000.

[0154] The reinforcement beam structure may be a hollow beam. Specifically, the first reinforcement protrusion 412 defines an upwardly concave first groove 4121, and the second reinforcement protrusion 423 defines a downwardly concave second groove 4231. The first groove 4121 and the second groove 4231 are opposite and connected to each other, and the first groove 4121 and the second groove 4231 together enclose a cavity of the reinforcement beam structure.

[0155] Furthermore, the first groove 4121 extends through the first plate 410 along the second direction Y and has a trapezoidal cross-section. The width of the first groove 4121 in the first direction X gradually decreases from the opening of the first groove 4121 toward the bottom. The second groove 4231 extends through the second plate 420 along the second direction Y and has a trapezoidal cross-section. The width of the second groove 4231 in the first direction X gradually decreases from the opening of the second groove 4231 toward the bottom. This optimizes the structure of the first and second reinforcing protrusions 412, 423, facilitating stamping of the first and second reinforcing protrusions 412, 423 and improving product yield.

[0156] Furthermore, a liquid leakage hole 4232 is formed on the second reinforcing protrusion 423, extending vertically through the second reinforcing protrusion 423. When liquid drips onto the mounting beam 400 and flows into the second groove 4231, the liquid can be discharged from the second groove 4231 through the liquid leakage hole 4232. This reduces the accumulation of liquid in the second groove 4231 and reduces the risk of corrosion of the mounting beam 400.

[0157] In the above technical solution, a plurality of first reinforcing protrusions 412 and a plurality of second reinforcing protrusions 423 are formed on the first plate 410 and the second plate 420, respectively. The first reinforcing protrusions 412 and the second reinforcing protrusions are opposed to each other up and down, which can respectively improve the structural strength of the first plate 410 and the second plate 420, improve the overall structural strength of the mounting beam 400, and improve the stability and reliability of the battery device 1000 when installed through the mounting beam 400.

[0158] In some embodiments of the present application, Figure 12 As shown, the mounting beam 400 also includes a mounting column 430, which extends vertically and passes through the first reinforcing protrusion 412 and the second reinforcing protrusion 423 in sequence, and is fixed to the first reinforcing protrusion 412 and the second reinforcing protrusion 423. The mounting column 430 is formed with a mounting hole 431 extending up and down, and the battery device 1000 is suitable for being fixed to the electrical device 1 by fasteners passing through the mounting hole 431.

[0159] In one example, the mounting column 430 is a steel member, and the mounting column 430 is in the shape of a cylinder extending in the up-down direction, and defines a mounting hole 431 on the inner side. A first hole is formed on the first reinforcing protrusion 412 that passes through the first reinforcing protrusion 412 in the up-down direction, and a second hole is formed on the second reinforcing protrusion 423 that passes through the second reinforcing protrusion 423 in the up-down direction. The mounting column 430 passes through the first hole and the second hole in sequence and is fixedly connected to the first plate 410 and the second plate 420.

[0160] Furthermore, the upper end of the mounting column 430 extends upward beyond the upper end surface of the first reinforcing protrusion 412, and the lower end of the mounting column 430 extends downward beyond the lower end surface of the second reinforcing protrusion 423. In this way, the length of the mounting column 430 can be increased. When the fastener is inserted into the mounting hole 431 of the mounting column 430, the mounting column 430 can enhance the protection and support effect of the fastener, thereby improving the connection reliability between the battery device 1000 and the electrical device 1.

[0161] There are multiple mounting posts 430, spaced apart along the first direction X. Each mounting post 430 is connected to each of the first reinforcement protrusions 412 and the second reinforcement protrusions 423 in a one-to-one correspondence. Furthermore, the mounting posts 430 are located at an end of the first reinforcement protrusions 412 and the second reinforcement protrusions 423 that is farther away from the main case 100 in the second direction Y. This reduces interference between the fasteners and the main case 100 during assembly, improving assembly efficiency.

[0162] In the above technical solution, a mounting column 430 having a mounting hole 431 is provided on the mounting beam 400. The mounting column 430 is fixed at the positions of the first reinforcing protrusion 412 and the second reinforcing protrusion 423. The mounting column 430 can not only improve the structural strength of the mounting beam 400, but also protect and support the fasteners passing through the mounting hole 431, thereby improving the connection reliability between the battery device 1000 and the electrical device 1.

[0163] In some embodiments of the present application, Figure 11 As shown, the battery device 1000 also includes: a reinforcing plate 500, which is arranged in the accommodating cavity 101, and the reinforcing plate 500 is fixedly connected to the two side walls of the main box 100 in the second direction Y, and is opposite to the inside and outside of the first folding edge 411 and / or the second folding edge 421.

[0164] There are two reinforcing plates 500, and the two reinforcing plates 500 are respectively arranged on the inner sides of the two opposite side walls of the main box 100 in the second direction Y. Furthermore, the reinforcing plates 500 are steel plates, the length direction of the reinforcing plates 500 is along the first direction X and the width direction is along the up-down direction, and the reinforcing plates 500 are attached to the inner side walls of the main box 100. The reinforcing plates 500 and the main box 100 can be welded, fastened and / or adhesively connected. For example, the reinforcing plates 500 and the main box 100 can be connected by resistance welding. By arranging the reinforcing plates 500 in the main box 100, the structural strength of the side walls of the main box 100 can be improved, and the connection reliability between the main box 100 and the mounting beam 400 can be improved.

[0165] The reinforcing plate 500 can be positioned inside and outside of the first folded edge 411 to improve the structural strength of the portion of the main box 100 side wall connected to the first folded edge 411. The reinforcing plate 500 can also be positioned inside and outside of the second folded edge 421 to improve the structural strength of the portion of the main box 100 side wall connected to the second folded edge 421. In addition, the reinforcing plate 500 can also be positioned inside and outside of both the first folded edge 411 and the second folded edge 421. Furthermore, the reinforcing plate 500 can also partially be positioned inside and outside of the third folded edge 422 of the second plate 420 to improve the structural strength of the portion of the bottom wall of the main box 100 connected to the third folded edge 422.

[0166] In the above technical solution, a reinforcing plate 500 is provided on the inner side of the main box 100, which is opposite to the first folding edge 411 and the second folding edge 421 inside and outside, thereby improving the structural strength of the connection position between the main box 100 and the first folding edge 411 and the second folding edge 421, and improving the connection reliability between the main box 100 and the mounting beam 400.

[0167] In some embodiments of the present application, the reinforcement plate 500 includes a first reinforcement section 510 and a second reinforcement section 520, the first reinforcement section 510 is fixed to the side wall of the main box 100, the second reinforcement section 520 is connected to the lower end of the first reinforcement section 510 and extends along the second direction Y, and the second reinforcement section 520 is fitted with and fixedly connected to the bottom wall of the main box 100.

[0168] For example, the reinforcing plate 500 includes a first reinforcing section 510 extending vertically and a second reinforcing section 520 extending horizontally, and the second reinforcing section 520 is connected to the lower end of the first reinforcing section 510. At this time, the cross-section of the reinforcing plate 500 perpendicular to the first direction X is L-shaped, wherein the upper end of the first reinforcing section 510 can extend to close to the upper edge of the first folding edge 411 or be flush with the upper edge of the first folding edge 411, and the lower end of the first reinforcing section 510 extends to the bottom wall of the main box 100. At this time, the first reinforcing section 510 can be opposite to the first folding edge 411 and the second folding edge 421 inside and outside, thereby enhancing the reinforcement effect on the side wall of the main box 100. Furthermore, the second reinforcement section 520 is opposite to the third fold 422 inside and outside, and the second reinforcement section 520 extends from a side edge away from the first reinforcement section 510 in the second direction Y to a side edge of the third fold 422 that is away from the second fold 421 and is close to or flush with the side edge of the third fold 422, so as to enhance the reinforcement effect on the bottom wall of the main box 100.

[0169] In the second direction Y, the end of the second reinforcement section 520 facing away from the first reinforcement section 510 is spaced apart from the edge of the heat exchange plate 300 facing the mounting beam 400 to reduce the probability of interference between the second reinforcement section 520 and the heat exchange plate 300.

[0170] In some examples, the battery device 1000 further includes a protective sheet 800 disposed within the accommodating cavity 101 and arranged above the second reinforcement segment 520 and the heat exchange plate 300. In the second direction Y, one end of the protective sheet 800 covers the upper surface of the end of the second reinforcement segment 520 facing away from the first reinforcement segment 510, and the other end of the protective sheet 800 covers the upper surface of the end of the heat exchange plate 300 facing the second reinforcement segment 520. The protective sheet 800 may be an insulating member, and the protective sheet 800 may be adhesively connected to the heat exchange plate 300 and the second reinforcement segment 520. Thus, the protective sheet can cover the opposing edges of the second reinforcement segment 520 and the heat exchange plate 300, reducing the probability of warping of the ends of the second reinforcement segment 520 and the heat exchange plate 300, and reducing the risk of the edges of the second reinforcement segment 520 and the heat exchange plate 300 puncturing the battery cells 200.

[0171] In the above technical solution, the reinforcing plate 500 can not only strengthen the structural strength of the side wall of the main box 100 through the first reinforcing section 510, but also strengthen the structural strength of the bottom wall of the main box 100 through the second reinforcing section 520, thereby further improving the structural strength of the main box 100 and improving the connection reliability between the main box 100 and the mounting beam 400.

[0172] In some embodiments of the present application, the first folded edge 411 , the side wall of the main box 100 and the reinforcing plate 500 are welded together.

[0173] For example, the first folded edge 411, the side wall of the main box 100, and the first reinforcement section 510 can be connected by resistance welding. Specifically, the first folded edge 411, the side wall of the main box 100, and the first reinforcement section 510 can be connected by resistance spot welding. Since the first folded edge 411 is made of steel, the side wall of the main box 100 includes a steel plate layer 110 and an aluminum plate layer 120, and the first reinforcement section 510 is a steel member, at this time, the materials of the battery device 1000 from the outside to the inside at this welding position are: steel, steel, aluminum, and steel. Since resistance welding can heat multiple layers of material at the same time, the multiple layers of material can be welded and fixed at the same position. In this way, there is no need to weld the first plate 410 and the reinforcement plate 500 to the main box 100 separately in batches, thereby improving the welding efficiency between the first folded edge 411, the main box 100, and the reinforcement plate 500, and enhancing the integrity of the mounting beam 400, the main box 100, and the reinforcement plate 500.

[0174] In the above technical solution, the first folded edge 411, the main box 100 and the reinforcing plate 500 are welded together, which can improve the welding efficiency between the first folded edge 411, the main box 100 and the reinforcing plate 500 and enhance the integrity of the mounting beam 400, the main box 100 and the reinforcing plate 500.

[0175] In some embodiments of the present application, Figure 13 As shown, the battery device 1000 further includes an expansion beam 600 , which is disposed in the accommodating cavity 101 and is welded to the main box 100 .

[0176] For example, the battery device 1000 may include two expansion beams 600, both of which extend along the second direction Y and are arranged at intervals in the first direction X. Multiple battery cells 200 are arranged between the two expansion beams 600, and the two expansion beams 600 can cooperate with each other to limit the multiple battery cells 200 and restrict the deformation of the multiple battery cells 200.

[0177] The expansion beam 600 is arranged in the accommodating cavity 101 and is fixedly connected to the main box 100. The fixation of the expansion beam 600 to the main box 100 can enhance the structural strength of the main box 100 and improve the deformation resistance of the main box 100. In addition, the expansion beam 600 can be in contact with the main box 100 and the battery cell 200, play a role in heat conduction, which is beneficial to improving the heat dissipation performance of the battery cell 200.

[0178] The expansion beam 600 and the main box 100 can be connected by laser welding or resistance welding. For example, the expansion beam 600 and the main box 100 can be connected by resistance spot welding. Welding the expansion beam 600 to the main box 100 can improve assembly efficiency and connection reliability between the expansion beam 600 and the main box 100. Compared with fastening connections, welding can also reduce the number of parts and save costs.

[0179] In one example, the expansion beam 600 includes multiple sheet metal parts, which are welded to each other to form the expansion beam 600. The multiple sheet metal parts are all steel plates. Specifically, the multiple sheet metal parts of the expansion beam 600 include: a first beam plate 610, a second beam plate 620 and a reinforcement beam plate 630. The first beam plate 610 and the second beam plate 620 both extend along the second direction Y and are arranged in the first direction X. The upper end of the first beam plate 610 is provided with a first connecting edge bent toward the second beam plate 620, and the lower end is provided with a second connecting edge bent toward the second beam plate 620. The upper end of the second beam plate 620 is provided with a third connecting edge bent toward the first beam plate 610, and the lower end of the second beam plate 620 is provided with a fourth connecting edge bent away from the first beam plate 610.

[0180] The first connecting edge and the third connecting edge are overlapped and fixedly connected in the first direction X. For example, the first connecting edge and the third connecting edge can be welded and / or adhesively connected.

[0181] Furthermore, the reinforcing beam plate 630 is arranged in the beam cavity 601 enclosed by the first beam plate 610 and the second beam plate 620, and is connected between the first beam plate 610 and the second beam plate 620. The reinforcing beam plate 630 has a reinforcing portion and a vertical plate portion. The cross-section of the reinforcing portion perpendicular to the second direction Y is U-shaped. The U-shaped opening end of the reinforcing portion is connected to the first beam plate 610, and the other end of the reinforcing portion protrudes toward the second beam plate 620 and is fixedly connected to the second beam plate 620. The vertical plate portion is connected to both sides of the reinforcing portion in the vertical direction and extends away from the reinforcing portion in the up and down directions. The vertical plate portion is fitted and fixed to the first beam plate 610.

[0182] Furthermore, the reinforcing beam plate 630 also includes: an extension portion, which extends along the first direction X, one end of the extension portion is connected to the lowermost vertical plate portion and extends downwardly at an angle, and the other end of the extension portion is arranged between the second connecting edge and the fourth connecting edge, and extends to the outside of the beam cavity 601, wherein the part of the extension portion located outside the beam cavity 601 is fixedly connected to the bottom wall of the main box 100.

[0183] The extension portion and the bottom wall of the main box 100 can be welded and / or adhesively bonded. In one specific example, the extension portion is welded to the bottom wall of the main box 100. Furthermore, the extension portion and the bottom wall of the main box 100 are connected by resistance welding. At the welding location between the extension portion and the bottom wall of the main box 100, the materials to be welded, from top to bottom, are: steel, aluminum, and steel. The use of resistance welding in this embodiment allows for simultaneous heating of multiple layers of material at this location, achieving a three-layer weld fixation of steel, aluminum, and steel, improving welding efficiency and enhancing the structural strength of the weld.

[0184] In the above technical solution, the expansion beam 600 can enhance the structural strength of the main box 100 and improve the deformation resistance of the main box 100. The expansion beam 600 can also play a role in heat conduction and improve the heat dissipation performance of the battery cell 200. In addition, the expansion beam 600 is welded to the main box 100, which can improve assembly efficiency, reduce the number of parts, and reduce costs.

[0185] In some embodiments of the present application, Figure 10 and Figure 14 As shown, the battery device 1000 also includes: a connecting bracket 700 and a bottom guard plate (not shown in the figure), the connecting bracket 700 is arranged on the outside of the main box 100 and is fixedly connected to the main box 100; the bottom guard plate is arranged on the lower side of the main box 100, and the bottom guard plate is connected to the main box 100 through the connecting bracket 700.

[0186] The bottom guard plate can be a metal plate or a non-metallic plate with a certain structural strength. For example, the bottom guard plate can be a steel plate or a composite material plate. On the one hand, the bottom guard plate can improve the structural strength of the bottom wall of the main box 100. On the other hand, it can protect the bottom wall of the main box 100 to avoid direct impact on the bottom wall of the main box 100 when the battery device 1000 is impacted from the bottom, thereby improving the reliability of the battery device 1000.

[0187] The bottom guard plate is fixedly connected to the main box 100 via a connecting bracket 700 , which makes it easier to fix the bottom guard plate. The connecting bracket 700 can also play a role in strengthening the structure of the main box 100 .

[0188] The connection bracket 700 and the main box 100 can be connected by welding, bonding, clamping or fasteners. Further, the connection bracket 700 and the main box 100 can be connected by resistance welding.

[0189] The number of the connecting bracket 700 may be one, or a plurality of connecting brackets 700 may be arranged at intervals. For example, the battery device 1000 may include two connecting brackets 700 , and the two connecting brackets 700 are arranged at intervals in the first direction X.

[0190] In the above technical solution, the bottom guard plate is fixedly connected to the main box 100 through the connecting bracket 700, which can facilitate the connection between the bottom guard plate and the main box 100. In addition, the bottom guard plate and the connecting bracket 700 can improve the overall structural strength of the battery device 1000 and enhance the reliability of the battery device 1000.

[0191] In some embodiments of the present application, Figure 14 As shown, the connecting bracket 700 includes: a main support plate 710 and an inclined support plate 720. The main support plate 710 is arranged on the lower side of the bottom wall of the main box 100. The edge of the main support plate 710 is formed with at least one lug 711, and the lug 711 protrudes from the periphery of the bottom wall of the main box 100; the inclined support plate 720 includes a first section 721, an inclined section 722 and a second section 723 connected in sequence. The first section 721 is a horizontal plate body, and is arranged on the upper side of the lug 711 and fixedly connected to the lug 711. The second section 723 is a plate body extending up and down, and is fitted with and fixedly connected to the side wall of the main box 100. In the direction from the first section 721 to the second section 723, the inclined section 722 extends upward.

[0192] The connecting bracket 700 may be a metal member, for example, a steel member, wherein the main support plate 710 is a steel plate, and the oblique support plate 720 is also a steel plate, thereby improving the structural strength of the connecting bracket 700.

[0193] The main support plate 710 is arranged horizontally, and the two ends of the main support plate 710 in the second direction Y extend to the two ends of the bottom wall of the main box 100 in the second direction Y respectively, so as to improve the structural reinforcement effect of the main support plate 710 on the bottom wall of the main box 100.

[0194] In the first direction X, a plurality of lugs 711 are provided on one edge of the main support plate 710 adjacent to the side wall of the main box 100. The lugs 711 are spaced apart along the second direction Y. The lugs 711 are horizontal plates extending along the first direction X. Both side edges of the lugs 711 in the second direction Y are bent upward to enhance the structural strength of the lugs 711. The number of lugs 711 can be two, three, four, five, seven, or more.

[0195] The inclined support plate 720 is inclined relative to the horizontal direction and is connected between the lug 711 and the side wall of the main box 100. The inclined support plate 720 can not only increase the connection area between the connecting bracket 700 and the main box 100, but also connect the connecting bracket 700 to the bottom wall and side wall of the main box 100 respectively, thereby improving the connection reliability between the connecting bracket 700 and the main box 100. On the other hand, a triangular connection structure can be formed between the inclined support plate 720, the lug 711 and the side wall of the main box 100, thereby further improving the connection stability between the connecting bracket 700 and the main box 100.

[0196] Furthermore, the first section 721 and the inclined section 722 are connected in an arc shape, and the second section 723 and the inclined section 722 are also connected in an arc shape, so as to reduce stress concentration.

[0197] In the above technical solution, the main support plate 710 can play a role in structural reinforcement of the bottom wall of the main box 100, thereby improving the overall structural strength of the battery device 1000, and can also increase the contact area with the main box 100, thereby improving the reliability of the fixed connection to the bottom guard plate. At the same time, the inclined support plate 720 can cooperate with the lug 711 of the main support plate 710 and the side wall of the main box 100 to form a triangular stable connection structure, which can further enhance the structural reinforcement effect of the connecting bracket 700 on the main box 100 and improve the connection reliability between the connecting bracket 700 and the main box 100.

[0198] In some embodiments of the present application, the first section 721 is connected to the side wall of the main box 100 by welding.

[0199] For example, the first section 721 can be connected to the side wall of the main box 100 by resistance welding. Specifically, the first section 721 and the side wall of the main box 100 can be connected by resistance spot welding. The materials to be welded at the welding location between the first section 721 and the side wall of the main box 100 are, in order: steel, aluminum, and steel. The use of resistance welding in this embodiment can simultaneously heat multiple layers of material at this location, achieving a three-layer weld fixation of steel, aluminum, and steel, improving welding efficiency and enhancing the structural strength of the weld.

[0200] Furthermore, the upper end of the first section 721 is bonded to the side wall of the main box 100 , and the lower end of the first section 721 is also bonded to the side wall of the main box 100 .

[0201] In one example, the second section 723 and the lug 711 can be connected by resistance welding, in which case two layers of steel plates are welded between the second section 723 and the lug 711. Furthermore, both ends of the second section 723 in the first direction X are respectively bonded to the lug 711 to improve the connection reliability between the second section 723 and the lug 711.

[0202] In the above technical solution, the first section 721 is connected to the side wall of the main box 100 by welding, which can improve the connection reliability between the first section 721 and the main box 100 and improve the assembly efficiency.

[0203] In a second aspect, an embodiment of the present application further provides an electrical device 1 comprising the battery device 1000 of any of the above embodiments.

[0204] In the above technical solution, since the electrical device 1 is provided with the above-mentioned battery device 1000, and the main box 100 of the battery device 1000 includes a stacked aluminum plate layer 120 and a steel plate layer 110, and the aluminum plate layer 120 is arranged on the side of the steel plate layer 110 facing the accommodating cavity 101, the steel plate layer 110 can improve the structural strength of the main box 100, and the aluminum plate layer 120 can improve the heat dissipation efficiency of the battery cell 200, reduce the probability of local overheating inside the battery device 1000, and increase the energy density of the battery device 1000, thereby improving the overall performance of the electrical device 1.

[0205] The following will refer to Figure 2-Figure 14 A battery device 1000 according to a specific embodiment of the present application is described.

[0206] Reference Figure 2-Figure 5 The battery assembly 1000 includes a housing, multiple battery cells 200, a heat exchange plate 300, two mounting beams 400, two reinforcement plates 500, two expansion beams 600, two connecting brackets 700, and a bottom guard plate. The housing includes a main housing 100, which defines an open-topped accommodating chamber 101. The heat exchange plate 300, reinforcement plate 500, and expansion beam 600 are all located within the accommodating chamber 101. The mounting beams 400, connecting brackets 700, and bottom guard plate are arranged outside the main housing 100.

[0207] The main box 100 is integrally stamped from a steel-aluminum composite plate, and the bottom wall and side walls of the main box 100 both include a steel plate layer 110 and an aluminum plate layer 120. The aluminum plate layer 120 is arranged on the side of the steel plate layer 110 facing the accommodating cavity 101. A heat exchange channel 102 with an open top is formed on the bottom wall of the main box 100. The heat exchange channel 102 extends back and forth along the first direction X on the bottom wall of the main box 100. The heat exchange plate 300 is an aluminum plate. The heat exchange plate 300 covers the open end of the heat exchange channel 102 and is brazed to the main box 100.

[0208] The two expansion beams 600 extend along the second direction Y and are spaced apart in the first direction X. The expansion beams 600 are made of steel, and the expansion beams 600 and the bottom wall of the main box 100 are connected and fixed by resistance spot welding to form a stacked three-layer steel, aluminum and steel material.

[0209] Multiple battery cells 200 are arranged between two expansion beams 600. Specifically, the multiple battery cells 200 are arranged into four battery cell 200 assemblies. Each battery cell 200 assembly includes multiple battery cells 200 stacked in sequence along a first direction X. The multiple battery cell 200 assemblies are arranged in sequence in a second direction Y.

[0210] The two reinforcing plates 500 are respectively attached to the two opposite side walls of the main box 100 in the second direction Y, and extend to the bottom wall of the main box 100. The two mounting beams 400 are symmetrically arranged on both sides of the main box 100 in the second direction Y. The mounting beams 400 include a first plate 410 and a second plate 420 stacked up and down. The first plate 410 and the second plate 420 are connected by resistance spot welding. One end of the first plate 410 is provided with a first folded edge 411 extending upward, and one end of the second plate 420 is provided with a second folded edge 421 extending downward. The lower end of the second folded edge 421 is provided with a third folded edge 422 extending toward the bottom wall of the main box 100. The first folded edge 411 and the second folded edge 421 are attached to the side walls of the main box 100, and the third folded edge 422 is attached to the bottom wall of the main box 100, and the first folded edge 411, the second folded edge 421 and the third folded edge 422 are opposite to the inside and outside of the reinforcing plate 500. The first folded edge 411, the side wall of the main box 100 and the reinforcing plate 500 are connected by resistance spot welding to weld the four stacked layers of steel, steel, aluminum and steel.

[0211] The two connecting brackets 700 are respectively arranged at the two ends of the main box 100 in the first direction X. The connecting bracket 700 includes a main support plate 710 and multiple oblique support plates 720. The main support plate 710 extends from one end of the bottom wall of the main box 100 to the other end along the second direction Y. The side edge of the main support plate 710 in the first direction X is provided with multiple lugs 711 arranged at intervals along the second direction Y. One end of the oblique support plate 720 is attached to the lug 711 and welded to it, and the other end of the oblique support plate 720 extends obliquely upward and toward the side wall of the main box 100. The upper end of the oblique support plate 720 is attached to the side wall of the main box 100, and the three-layer material of steel, steel and aluminum is connected and fixed by resistance spot welding.

[0212] Finally, it should be noted that 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device (1000), characterized in that: include: A main box (100), the main box (100) defining a receiving cavity (101) with an open top, the main box (100) comprising a steel plate layer (110) and an aluminum plate layer (120) stacked in a thickness direction, the aluminum plate layer (120) being arranged on a side of the steel plate layer (110) facing the receiving cavity (101); A battery cell (200), the battery cell (200) being arranged in the accommodating cavity (101).

2. The battery device (1000) according to claim 1, characterized in that The main box (100) is integrally stamped from a steel-aluminum composite plate.

3. The battery device (1000) according to claim 1, characterized in that The battery device (1000) further includes: a heat exchange plate (300), the heat exchange plate (300) being an aluminum plate, the heat exchange plate (300) being arranged in the accommodating cavity (101) and being brazed to the aluminum plate layer (120), the heat exchange plate (300) and the bottom wall of the main box (100) cooperating to define a heat exchange flow channel (102), and the battery cell (200) being arranged on the upper side of the heat exchange plate (300).

4. The battery device (1000) according to claim 3, characterized in that The bottom wall of the main box (100) is formed with the heat exchange channel (102) which is bent and extended and has an open top. The heat exchange plate (300) is a flat plate and covers the open top side of the heat exchange channel (102).

5. The battery device (1000) according to claim 1, characterized in that Also includes: A mounting beam (400) extends along a first direction (X) and is arranged on both sides of the main box (100) in a second direction (Y). The mounting beam (400) is arranged outside the accommodating cavity (101) and is welded to the main box (100). The battery device (1000) is suitable for being installed on the electrical device (1) via the mounting beam (400).

6. The battery device (1000) according to claim 5, characterized in that The mounting beam (400) includes a first plate (410) and a second plate (420) located below the first plate (410), wherein the first plate (410) and the second plate (420) are stacked and connected in an up-down direction, and the first plate (410) and the second plate (420) are both connected to the main box (100).

7. The battery device (1000) according to claim 6, characterized in that A first folding edge (411) extending upward is provided on one side edge of the first plate (410) in the second direction (Y), and the first folding edge (411) is fitted and fixedly connected to the main box (100). A second folded edge (421) extending downward is provided on one side edge of the second plate (420) in the second direction (Y), and the second folded edge (421) is fitted with and fixedly connected to the main box (100).

8. The battery device (1000) according to claim 7, characterized in that A third fold (422) extending along the second direction (Y) toward the main box (100) is provided at the lower end of the second fold (421), and the third fold (422) is in contact with and fixedly connected to the bottom wall of the main box (100).

9. The battery device (1000) according to claim 6, characterized in that The first plate (410) is formed with a plurality of first reinforcing protrusions (412) protruding upward, and the plurality of first reinforcing protrusions (412) are arranged at intervals along the first direction (X); the second plate (420) is formed with a plurality of second reinforcing protrusions (423) protruding downward, and the plurality of second reinforcing protrusions (423) are arranged at intervals along the first direction (X); the plurality of first reinforcing protrusions (412) and the plurality of second reinforcing protrusions (423) correspond one to one and are opposite to each other up and down.

10. The battery device (1000) according to claim 9, characterized in that The mounting beam (400) further includes a mounting column (430), which extends vertically and passes through the first reinforcing protrusion (412) and the second reinforcing protrusion (423) in sequence, and is fixed to the first reinforcing protrusion (412) and the second reinforcing protrusion (423). The mounting column (430) is formed with a mounting hole (431) extending vertically, and the battery device (1000) is suitable for being fixed to the electrical device by a fastener passing through the mounting hole (431).

11. The battery device (1000) according to claim 7, characterized in that The battery device (1000) further comprises: a reinforcing plate (500), the reinforcing plate (500) being arranged in the accommodating cavity (101), the reinforcing plate (500) being fixedly connected to the side walls of the main box (100) on both sides in the second direction (Y), and being opposite to the first folding edge (411) and / or the second folding edge (421) inside and outside.

12. The battery device (1000) according to claim 11, characterized in that The reinforcing plate (500) includes a first reinforcing section (510) and a second reinforcing section (520), wherein the first reinforcing section (510) is fixed to the side wall of the main box (100), and the second reinforcing section (520) is connected to the lower end of the first reinforcing section (510) and extends along a second direction (Y), and the second reinforcing section (520) is in contact with and fixedly connected to the bottom wall of the main box (100).

13. The battery device (1000) according to claim 11, characterized in that The first folded edge (411), the side wall of the main box (100), and the reinforcing plate (500) are connected by welding.

14. The battery device (1000) according to any one of claims 1 to 13, characterized in that: The battery device (1000) further comprises an expansion beam (600), wherein the expansion beam (600) is arranged in the accommodating cavity (101) and is welded to the main box (100).

15. The battery device (1000) according to any one of claims 1 to 13, characterized in that: The battery device (1000) further comprises: a connecting bracket (700), the connecting bracket (700) being arranged outside the main box (100) and fixedly connected to the main box (100); A bottom guard plate is provided on the lower side of the main box (100), and the bottom guard plate is connected to the main box (100) via the connecting bracket (700).

16. The battery device (1000) according to claim 15, characterized in that The connecting bracket (700) comprises: a main support plate (710), the main support plate (710) being arranged on the lower side of the bottom wall of the main box (100), the edge of the main support plate (710) being formed with at least one lug (711), the lug (711) being protruding from the peripheral edge of the bottom wall of the main box (100); An inclined support plate (720), the inclined support plate (720) includes a first section (721), an inclined section (722) and a second section (723) connected in sequence, the first section (721) being a horizontal plate body, and being arranged on the upper side of the lug (711) and being fixedly connected to the lug (711), the second section (723) being a plate body extending up and down, and being in contact with and fixedly connected to the side wall of the main box (100), and in the direction from the first section (721) to the second section (723), the inclined section (722) extending upwardly.

17. The battery device (1000) according to claim 16, characterized in that The first section (721) is welded to the side wall of the main box (100).

18. An electrical device (1), characterized in that: A battery device (1000) comprising any one of claims 1-17.

Images