Battery apparatus and electric apparatus

Abstract

A battery apparatus (1000) and an electric apparatus (1). The battery apparatus (1000) comprises: a main box (100), wherein the main box (100) defines an accommodating cavity (101) with an open top, the main box (100) comprises a steel plate layer (110) and an aluminum plate layer (120) that are stacked in the thickness direction, and the aluminum plate layer (120) is arranged on the side of the steel plate layer (110) facing the accommodating cavity (101); and a battery cell (200), arranged in the accommodating cavity (101).

Description

Battery device and electric device

[0001] Cross-reference to related applications

[0002] The present application is based on the Chinese patent application No. 202422193915.0, filed on September 6, 2024, and claims priority to the Chinese patent application No. 202422193915.0, the entire contents of which are incorporated herein. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, in particular to a battery device and an electric device. BACKGROUND

[0004] In the related art, the weight of the box of the battery device is large, and the performance of the box needs to be improved.

[0005] SUMMARY

[0006] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a battery device, and an electric device comprising the same, the main box of the battery device has high structural strength, good heat dissipation performance, and can also improve the energy density of the battery device.

[0007] In a first aspect, the embodiments of the present application provide a battery device, comprising: a main box, the main box defining a containing cavity with an open top, the main box comprising a steel plate layer and an aluminum plate layer arranged in a stacked manner in a thickness direction, the aluminum plate layer being arranged on a side of the steel plate layer facing the containing cavity; and a battery monomer, the battery monomer being arranged in the containing cavity.

[0008] In the above technical solution, the main box comprises the aluminum plate layer and the steel plate layer arranged in a stacked manner, and the aluminum plate layer is arranged on a side of the steel plate layer facing the containing 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 monomer, reduce the probability of local overheating in the battery device, and improve the energy density of the battery device.

[0009] In some embodiments, the main box is integrally stamped and formed by a steel-aluminum composite plate.

[0010] In the above technical solution, the main box is integrally stamped and formed by a steel-aluminum composite plate, which can improve the production efficiency of the main box, reduce the assembly difficulty of the main box, and reduce the production cost.

[0011] In some embodiments, the battery device further comprises: a heat exchange plate, the heat exchange plate being an aluminum plate, the heat exchange plate being arranged in the containing cavity and being connected to the aluminum plate layer by brazing, the heat exchange plate and a bottom wall of the main box cooperatively defining a heat exchange flow channel, and the battery monomer being arranged on an upper side of the heat exchange plate.

[0012] In the technical scheme, 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 the heat exchange flow channel, which can 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, improve the energy density, and improve the heat exchange efficiency between the heat exchange fluid and the battery monomer, so that the battery monomer operates stably.

[0013] In some embodiments, the bottom wall of the main box forms a heat exchange flow channel extending in a bent manner and having an open top, and the heat exchange plate is a flat plate and covers the open top of the heat exchange flow channel.

[0014] In the technical scheme, the bottom wall of the main box forms a heat exchange flow channel with an open top, the heat exchange plate is a flat plate and covers the heat exchange flow channel, and the heat exchange flow channel extends in a bent manner, which can increase the flow path of the heat exchange flow channel, improve the heat exchange efficiency, and simplify the structure of the heat exchange plate, so that the heat exchange flow channel can be integrally formed by stamping when the main box is stamped, thereby reducing the processing steps, improving the processing efficiency, and reducing the processing cost.

[0015] In some embodiments, the battery device further comprises a mounting beam extending along the first direction and arranged on both sides of the main box in the second direction, the mounting beam is arranged outside the accommodating cavity and connected to the main box by welding, and the battery device is adapted to be mounted on the power utilization device through the mounting beam.

[0016] In the technical scheme, the mounting beam of the battery device is arranged for mounting, and the mounting beam is connected to the main box by welding, which can improve the connection strength between the mounting beam and the main box, improve the assembly efficiency, and the mounting beam can also support the main box to improve the structural strength of the main box and facilitate the assembly of the battery device and the power utilization device.

[0017] In some embodiments, the mounting beam comprises a first plate and a second plate arranged below the first plate, the first plate and the second plate are arranged in a stacked manner in the up-down direction and connected, and the first plate and the second plate are both connected to the main box.

[0018] In the technical scheme, the mounting beam comprises a first plate and a second plate arranged in a stacked manner, and the first plate and the second plate are both fixedly connected to the main box, which can simplify the structure of the mounting beam, facilitate the processing and forming of the mounting beam, and improve the connection reliability between the mounting beam and the main box.

[0019] In some embodiments, one side edge of the first plate in the second direction is provided with a first folded edge extending upward, the first folded edge is fitted and fixedly connected to the main box, and one side edge of the second plate in the second direction is provided with a second folded edge extending downward, the second folded edge is fitted and fixedly connected to the main box.

[0020] In the technical scheme, the first plate is attached to and fixedly connected to the main box through the first fold edge, and the second plate is attached to and fixedly connected to the main box through the second fold edge, so that the connecting area between the first plate and the second plate and the main box can be increased, and the connecting reliability and stability between the first plate and the second plate and the main box can be improved.

[0021] In some embodiments, the lower end of the second fold edge is provided with a third fold edge extending towards the main box in the second direction, and the third fold edge is attached to and fixedly connected to the bottom wall of the main box.

[0022] In the technical scheme, the third fold edge is connected to the lower end of the second fold edge and is attached to and fixedly connected to the bottom wall of the main box, so that the overlapping area between the second plate and the main box can be further increased, the connecting reliability between the second plate and the main box can be further improved, and the third fold edge can also support the main box on the lower side of the main box and improve the structural strength of the main box.

[0023] In some embodiments, the first plate is formed with a plurality of first reinforcing protrusions protruding upwards, the plurality of first reinforcing protrusions are arranged at intervals in the first direction, the second plate is formed with a plurality of second reinforcing protrusions protruding downwards, the plurality of second reinforcing protrusions are arranged at intervals in the first direction, and the plurality of first reinforcing protrusions correspond to the plurality of second reinforcing protrusions one by one and are opposite to each other in the up-down direction.

[0024] In the technical scheme, the plurality of first reinforcing protrusions and the 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 in the up-down direction, so that the structural strength of the first plate and the second plate can be improved respectively, the overall structural strength of the mounting beam can be improved, and the stability and reliability of the battery device when mounted through the mounting beam can be improved.

[0025] In some embodiments, the mounting beam further comprises a mounting column, the mounting column extends vertically and sequentially passes through the first reinforcing protrusion and the second reinforcing protrusion and is fixed to the first reinforcing protrusion and the second reinforcing protrusion, the mounting column is formed with a mounting hole extending in the up-down direction, and the battery device is adapted to be fixed to the electric device through the fastener passing through the mounting hole.

[0026] In the technical scheme, the mounting column with the mounting hole is arranged on the mounting beam, and the mounting column is fixed to the positions of the first reinforcing protrusion and the second reinforcing protrusion, so that the structural strength of the mounting beam can be improved, and the fastener passing through the mounting hole can be protected and supported, and the connecting reliability between the battery device and the electric device can be improved.

[0027] In some embodiments, the battery device further comprises a reinforcing plate, the reinforcing plate is arranged in the accommodating cavity, the reinforcing plate is fixedly connected to the two side walls of the main box in the second direction, and the reinforcing plate is opposite to the first fold edge and / or the second fold edge in the inner-outer direction.

[0028] In the technical scheme, the reinforcing plate is arranged on the inner side of the main box and is opposite to the first and second folded edges, so that the structural strength of the connection position between the main box and the first and second folded edges can be improved, and the connection reliability between the main box and the mounting beam can be improved.

[0029] In some embodiments, the reinforcing plate comprises a first reinforcing section and a second reinforcing section, the first reinforcing section is fixed to the side wall of the main box, and the second reinforcing section is connected to the lower end of the first reinforcing section and extends in the second direction, and the second reinforcing section is in abutment with and fixedly connected to the bottom wall of the main box.

[0030] In the technical scheme, the reinforcing plate can not only strengthen the structural strength of the side wall of the main box through the first reinforcing section, but also strengthen the structural strength of the bottom wall of the main box through the second reinforcing section, so that the structural strength of the main box can be further improved, and the connection reliability between the main box and the mounting beam can be improved.

[0031] In some embodiments, the first folded edge, the side wall of the main box and the reinforcing plate are welded and connected.

[0032] In the technical scheme, the first folded edge, the main box and the reinforcing plate are welded and connected, so that the welding efficiency between the first folded edge, the main box and the reinforcing plate can be improved, and the integrity of the mounting beam, the main box and the reinforcing plate can be improved.

[0033] In some embodiments, the battery device further comprises an expansion beam, the expansion beam is arranged in the accommodating cavity and is welded and connected to the main box.

[0034] In the technical scheme, the expansion beam can improve the structural strength of the main box and improve the deformation resistance of the main box, the expansion beam can also play a role in heat conduction, improve the heat dissipation performance of the battery monomer, in addition, the expansion beam is welded and connected to the main box, so that the assembly efficiency can be improved, the number of parts can be reduced, and the cost can be reduced.

[0035] In some embodiments, the battery device further comprises a connecting bracket, the connecting bracket is arranged on the outer side of the main box and is fixedly connected to the main box, and a bottom guard plate, the bottom guard plate is arranged on the lower side of the main box, and the bottom guard plate is connected to the main box through the connecting bracket.

[0036] In the technical scheme, the bottom guard plate is fixedly connected to the main box through the connecting bracket, so that the bottom guard plate can be conveniently connected to the main box, in addition, the bottom guard plate and the connecting bracket can improve the overall structural strength of the battery device and improve the reliability of the battery device.

[0037] In some embodiments, the connecting support comprises: a main support plate arranged at the lower side of the bottom wall of the main box, the edge of the main support plate is formed with at least one lug protruding from the periphery of the bottom wall of the main box; an inclined support plate comprising a first section, an inclined section and a second section connected in sequence, the first section is a horizontal plate body arranged at the upper side of the lug and fixedly connected with the lug, the second section is an up-down extending plate body fitted with and fixedly connected with the side wall of the main box, the inclined section extends upwardly in the direction from the first section to the second section.

[0038] In the above technical solution, the main support plate can play a role of structural reinforcement for the bottom wall of the main box, improve the overall structural strength of the battery device, and increase the contact area with the main box to improve the reliability of the fixed connection with the bottom guard plate. Meanwhile, the inclined support plate can cooperate with the lug of the main support plate and the side wall of the main box to form a triangular stable connection structure, which can further improve the structural reinforcement of the connecting support for the main box and the connection reliability between the connecting support and the main box.

[0039] In some embodiments, the first section is welded to the side wall of the main box.

[0040] 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.

[0041] In a second aspect, the embodiments of the present application provide a power utilization device comprising the battery device according to the first aspect of the present application.

[0042] In the above technical solution, since the power utilization device is provided with the above battery device, and the main box of the battery device comprises the laminated aluminum plate layer and steel plate layer, 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, the aluminum plate layer can improve the heat dissipation efficiency of the battery monomer, reduce the probability of local overheating in the battery device, and improve the energy density of the battery device, thereby improving the overall performance of the power utilization device.

[0043] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0044] FIG. 1 is a schematic view of a vehicle according to an embodiment of the present application;

[0045] FIG. 2 is a schematic view of a battery device according to an embodiment of the present application;

[0046] FIG. 3 is a schematic view of the battery device according to an embodiment of the present application from another angle;

[0047] FIG. 4 is an exploded view of the structure of the battery device according to an embodiment of the present application;

[0048] Fig. 5 is a schematic view of a main tank of a battery device according to an embodiment of the present application;

[0049] Fig. 6 is a schematic view of a heat exchange plate of a battery device according to an embodiment of the present application;

[0050] Fig. 7 is a schematic view of a main tank and a heat exchange plate of a battery device according to an embodiment of the present application;

[0051] Fig. 8 is a sectional view along line A-A in Fig. 7;

[0052] Fig. 9 is a sectional view along line B-B in Fig. 7;

[0053] Fig. 10 is a schematic view of a battery device (not including battery cells) according to an embodiment of the present application;

[0054] Fig. 11 is a sectional view along line C-C in Fig. 10;

[0055] Fig. 12 is an enlarged view of a mounting beam of a battery device according to an embodiment of the present application;

[0056] Fig. 13 is a sectional view along line D-D in Fig. 10;

[0057] Fig. 14 is a sectional view along line E-E in Fig. 10.

[0058] Reference signs: 1, power consuming device; 1000, battery device; 2000, controller; 3000, motor; 100, main tank; 101, accommodating cavity; 102, heat exchange flow channel; 110, steel plate layer; 120, aluminum plate layer; 200, battery cell; 300, heat exchange plate; 400, mounting beam; 410, first plate; 411, first folded edge; 412, first reinforcing protrusion; 4121, first groove; 420, second plate; 421, second folded edge; 422, third folded edge; 423, second reinforcing protrusion; 4231, second groove; 4232, liquid leakage hole; 430, mounting column; 431, mounting hole; 500, reinforcing plate; 510, first reinforcing section; 520, second reinforcing section; 600, expansion beam; 610, first beam plate; 620, second beam plate; 630, reinforcing beam plate; 601, beam cavity; 700, connecting bracket; 710, main bracket plate; 711, lug; 720, inclined bracket plate; 721, first section; 722, inclined section; 723, second section; 800, protective sheet; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0059] Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," "having" and "with" in the specification and claims hereof, along with their variants, are intended to be equivalent to the term "consisting of." The use of the term "about" in relation to a geographic location, is intended to be synonymous with the term "approximately."

[0061] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0062] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification are not necessarily all referring to the same embodiment, or to the same alternative embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0063] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0064] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two).

[0065] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. The orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0066] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the terms "mounting", "connected", "connecting", "fixed", and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0067] In the present application, the battery cell can include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc. The embodiments of the present application are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The embodiments of the present application are not limited thereto. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cell, square battery cell, and soft package battery cell, etc. The embodiments of the present application are not limited thereto.

[0068] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include one or more battery cells, and when there are multiple battery cells, the multiple battery cells are connected in series, in parallel, or in a mixed connection through a busbar component.

[0069] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0070] In some embodiments, the battery apparatus can be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0071] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0072] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0073] As an example, the box can include a first box and a second box. The first box and the second box are fastened so that an inside of the box forms a closed space to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0074] As an example, the box can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively so that an inside of the box forms a closed space to accommodate the battery cell assembly.

[0075] As an example, the box can be part of a chassis structure of a vehicle. For example, the top cover of the box can be at least part of a floor of the vehicle, or the frame of the box can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0076] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0077] The battery cell mentioned in the embodiments of the present application can include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery or a magnesium ion battery, etc., which are not limited by the embodiments of the present application. The battery cell can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc., which are also not limited by the embodiments of the present application. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cell, square battery cell and soft package battery cell, which are also not limited by the embodiments of the present application.

[0078] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells and battery devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc., such as spacecraft including airplanes, rockets, space shuttles and spacecraft, etc.

[0079] At present, from the development of market situation, the application of power battery is more and more widely. The power battery is not only applied to the energy storage power supply system of hydroelectric, thermal, wind and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, electric vehicles, military equipment and aerospace, etc. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0080] In recent years, new energy vehicles have made a great leap in development. In the field of electric vehicles, battery devices play an irreplaceable important role as the power source of electric vehicles. Among them, the battery device as a core part of new energy vehicles has higher requirements in terms of energy density and reliability.

[0081] In the related art, the battery device has a heavy box body and low heat conduction efficiency, which affects the energy density of the battery device and the heat dissipation performance of the battery monomer.

[0082] Based on the above considerations, in order to improve the heat conduction efficiency of the box body under the premise of ensuring the structural strength of the box body, reduce the weight of the box body, and improve the energy density, a battery device is designed. The main box of the battery device includes an aluminum plate layer and a steel plate layer arranged in 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 can improve the heat dissipation efficiency of the battery monomer, reduce the probability of local overheating in the battery device, and improve the energy density of the battery device.

[0083] The embodiments of the present application provide a power consumption device using the battery device of the present disclosure as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0084] The following embodiments are described in detail for the convenience of explanation, taking the power consumption device 1 as a vehicle as an example, and the structure of the power consumption device 1 and the battery device 1000 of the present application is introduced in detail.

[0085] Please refer to FIG. 1, which is a structural schematic diagram of the power consumption device 1 as a vehicle provided by some embodiments of the present application. The vehicle can be a fuel car, a gas car, or a new energy car. The new energy car can be a pure electric car, a hybrid car, or an extended range car, etc. The vehicle is provided with a battery device 1000, which can be arranged at the bottom, head or tail of the vehicle. The battery device 1000 can be used for power supply of the vehicle, for example, the battery device 1000 can be used as the operating power supply of the vehicle. The vehicle can also include a controller 2000 and a motor 3000, the controller 2000 is used to control the battery device 1000 to supply power to the motor 3000, for example, for the working power demand of the vehicle during starting, navigation and driving. In some embodiments of the present application, the battery device 1000 can not only be used as the operating power supply of the vehicle, but also be used as the driving power supply of the vehicle, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle.

[0086] The battery device 1000 according to the first aspect of the present application is described below with reference to FIGS. 2-14.

[0087] Please refer to FIG. 2-FIG. 4, FIG. 2 is a schematic diagram of a battery device 1000 according to some embodiments of the present application; FIG. 3 is another schematic diagram of the battery device 1000 according to embodiments of the present application; FIG. 4 is an exploded view of the battery device 1000 according to some embodiments of the present application. The battery device 1000 comprises 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 main box. FIG. 5 is a schematic diagram of the main box 100 of the battery device 1000 according to embodiments of the present application; FIG. 6 is a schematic diagram of a heat exchange plate 300 of the battery device 1000 according to embodiments of the present application; FIG. 7 is a schematic diagram of the main box 100 and the heat exchange plate 300 of the battery device 1000 according to embodiments of the present application; FIG. 8 is a sectional view along line A-A in FIG. 7; FIG. 9 is a sectional view along line B-B in FIG. 7; FIG. 10 is a schematic diagram of the battery device 1000 (not containing the battery cells 200) according to embodiments of the present application; FIG. 11 is a sectional view along line C-C in FIG. 10; FIG. 12 is a partial enlarged view of a mounting beam 400 of the battery device 1000 according to embodiments of the present application; FIG. 13 is a sectional view along line D-D in FIG. 10; FIG. 14 is a sectional view along line E-E in FIG. 10.

[0088] For convenience of description, it is assumed that the length direction of the main box 100 is a first direction X, the width direction of the main box 100 is a second direction Y, and the height direction of the main box 100, i.e., the up-down direction, is a third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0089] It should be noted that the third direction Z is perpendicular to the first direction X and the second direction Y, which means that the first direction X and the second direction Y are arranged at an angle, and the included 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 can be arranged at an angle of 30°, 60°, 90°, 120°, or 150°; the third direction Z is arranged at an angle with the first direction X, and the included 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 can be arranged at an angle of 30°, 60°, 90°, 120°, or 150°; the third direction Z is arranged at an angle with the second direction Y, and the included 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 can be arranged at an angle of 30°, 60°, 90°, 120°, or 150°.

[0090] 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-rear direction, and the third direction Z is the up-down direction.

[0091] The embodiment of the present application provides a battery device 1000, as shown in FIGS. 2-4, the battery device 1000 comprises a main box 100 and a battery monomer 200, the main box 100 defines a containing cavity 101 open at the top, the main box 100 comprises a steel plate layer 110 and an aluminum plate layer 120 arranged in a thickness direction, and the aluminum plate layer 120 is arranged on the side of the steel plate layer 110 facing the containing cavity 101; the battery monomer 200 is arranged in the containing cavity 101.

[0092] The main box 100 can be a top-open rectangular box body shape, and the main box 100 defines the containing cavity 101 for providing arrangement space for the battery monomer 200 and the remaining components of the battery device 1000.

[0093] The main box 100 is a metal piece and is made of a metal plate. The main box 100 comprises the aluminum plate layer 120 and the steel plate layer 110 arranged inside and outside, that is, the aluminum plate layer 120 is formed into a top-open rectangular box body shape, the steel plate layer 110 is also formed into a top-open box body shape, and the steel plate layer 110 is wrapped on the outside of the aluminum plate layer 120.

[0094] The steel plate layer 110 has high structural strength and corrosion resistance, so that the structural strength of the main box 100 can be improved, and the external impact resistance of the battery device 1000 can be improved, and meanwhile, the steel plate layer 110 has poor conductivity, so that the probability of short circuit of the main box 100 can be reduced.

[0095] The aluminum plate layer 120 is arranged on the side of the steel plate layer 110 facing the containing cavity 101, the aluminum plate layer 120 has good heat conduction performance, so that the heat dissipation efficiency of the battery monomer 200 in the containing cavity 101 can be improved, and the risk of local overheating in the containing cavity 101 can be reduced, and meanwhile, the aluminum plate layer 120 is lighter than the steel plate layer 110, so that the energy density of the battery device 1000 can be improved.

[0096] The number of the battery monomers 200 can be multiple, and the multiple battery monomers 200 are arranged in the containing cavity 101 in a stacking manner along the first direction X and / or the second direction Y.

[0097] In the above technical solution, the main box 100 comprises the aluminum plate layer 120 and the steel plate layer 110 arranged in a stacking manner, and the aluminum plate layer 120 is arranged on the side of the steel plate layer 110 facing the containing cavity 101, the steel plate layer 110 can improve the structural strength of the main box 100, the aluminum plate layer 120 can improve the heat dissipation efficiency of the battery monomer 200, reduce the probability of local overheating in the battery device 1000, and improve the energy density of the battery device 1000.

[0098] In some embodiments of the present application, as shown in FIGS. 4 and 5, the main box 100 is integrally punched and formed by a steel-aluminum composite plate.

[0099] The steel-aluminum composite plate is composed of a steel plate layer and an aluminum plate layer. The steel-aluminum composite plate has the advantages of high strength and high melting point of steel, and the characteristics of good electrical conductivity, good thermal conductivity, corrosion resistance and low density of aluminum.

[0100] In the embodiment, the main box 100 is formed by the steel-aluminum composite plate. The strength and corrosion resistance of the main box 100 are improved, the thermal conductivity of the main box 100 is improved, the weight of the main box 100 is reduced, the assembly process between the steel plate layer 110 and the aluminum plate layer 120 is reduced, and the production efficiency is improved. Further, the main box 100 is integrally formed by stamping. The processing steps and assembly steps of the main box 100 are reduced, the processing efficiency and assembly efficiency of the main box 100 are improved, and the production cost is reduced.

[0101] In the above technical solution, the main box 100 is integrally formed by stamping the steel-aluminum composite plate. The production efficiency of the main box 100 is improved, the assembly difficulty of the main box 100 is reduced, and the production cost is reduced.

[0102] 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.

[0103] For example, the thickness of the steel plate layer 110 can be 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm or 2 mm or more. For example, the thickness of the aluminum plate layer 120 can be 0.3 mm, 0.4 mm, 0.5 mm, 0.7 mm, 0.8 mm, 1 mm or more.

[0104] 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 welding requirements of the aluminum plate layer 120 and other components in the main box 100 and heat dissipation requirements of the main box 100, to improve the heat conduction effect of the main box 100 and improve the assembly performance of the battery device 1000.

[0105] In some embodiments of the present application, as shown in FIGS. 4-9, the battery device 1000 further comprises a heat exchange plate 300. The heat exchange plate 300 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 cooperatively define a heat exchange flow channel 102. The battery monomer 200 is arranged on the upper side of the heat exchange plate 300.

[0106] The heat exchange plate 300 can be horizontally arranged in a flat plate shape. The heat exchange plate 300 is an aluminum plate, which can improve the heat exchange efficiency between the heat exchange plate 300 and the battery monomer 200, and improve the temperature uniformity among the plurality of battery monomers 200. Further, the thickness of the heat exchange plate 300 can be greater than or equal to 0.5 mm, for example, the thickness of the heat exchange plate 300 can be 0.6 mm, 0.7 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm or more. In this way, the heat exchange plate 300 can have a certain structural strength while ensuring the heat conduction performance of the heat exchange plate 300, which can support the battery monomer 200.

[0107] The heat exchange plate 300 and the bottom wall of the main tank 100 cooperatively define a heat exchange flow channel 102. In this way, the heat exchange flow channel 102 can be directly formed by the main tank 100 and the heat exchange plate 300, without the need for additional cold plates or heat exchange tubes, thereby reducing the number of components and reducing costs. The fluid in the heat exchange flow channel 102 can directly exchange heat with the battery monomer 200 through the heat exchange plate 300, thereby further improving the heat exchange efficiency between the heat exchange fluid and the battery monomer 200, reducing heat loss, and improving heat exchange performance.

[0108] The heat exchange plate 300 and the aluminum plate layer 120 of the bottom wall of the main tank 100 are brazed, which can improve the connection strength between the heat exchange plate 300 and the main tank 100, improve the welding efficiency between the heat exchange plate 300 and the main tank 100, and improve the assembly efficiency of the battery device 1000.

[0109] The heat exchange flow channel 102 between the heat exchange plate 300 and the bottom wall of the main tank 100 can be a heat exchange cavity. The heat exchange flow channel 102 can also extend between the heat exchange plate 300 and the bottom wall of the main tank 100. Further, at least one of the heat exchange plate 300 and the bottom wall of the main tank 100 is formed with a groove structure, for example, the lower surface of the heat exchange plate 300 is provided with a first groove, the upper surface of the bottom wall of the main tank 100 is a flat surface, and the bottom wall of the main tank 100 covers the first groove to define the heat exchange flow channel 102. For example, the lower surface of the heat exchange plate 300 is formed with a first groove, the upper surface of the bottom wall of the main tank 100 is formed with a second groove, the first groove and the second groove are opposite and communicate to define the heat exchange flow channel 102.

[0110] It should be noted that in the prior art, the cold plate and the heat exchange pipe of the stamping box are both arranged outside the box, that is, the cold plate and the heat exchange pipe are arranged outside the box, and heat exchange needs to be exchanged through the stamping box, which affects the heat exchange efficiency, and since the cold plate and the heat exchange pipe are arranged outside the box, a bottom guard plate needs to be added for protection of the cold plate or the heat exchange pipe. Among them, the cold plate and the box are usually connected by pull rivet nuts, and the bottom guard plate and the box are connected by bolts, so a large number of pull rivet nuts and bolts need to be arranged, the number of parts is large, and the assembly efficiency is low.

[0111] In the embodiment, the heat exchange plate 300 cooperates with the bottom wall of the main box 100 to define the heat exchange flow channel 102, so that heat exchange does not need to pass through the box, the heat exchange efficiency is improved, the heat exchange plate 300 is brazed to the main box 100, no pull rivet nut is needed, the structure is simpler, the number of parts is reduced, the assembly efficiency is improved, and the production cost is reduced. In addition, the bottom guard plate can be connected to the main box 100 by welding, so that the number of parts can be further reduced and the assembly efficiency can be improved.

[0112] 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 the heat exchange flow channel 102, which not only can improve the assembly efficiency and connection strength between the heat exchange plate 300 and the main box 100, reduce the number of parts, compact the structure of the battery device 1000, and improve the energy density, but also can improve the heat exchange efficiency between the heat exchange fluid and the battery monomer 200, so that the battery monomer 200 operates stably.

[0113] In some embodiments of the present application, as shown in FIGS. 8 and 9, the bottom wall of the main box 100 forms a heat exchange flow channel 102 extending with a bend and an open top, and the heat exchange plate 300 is a flat plate and covers the open side of the heat exchange flow channel 102.

[0114] In one example, one or more heat exchange flow channels 102 can be formed on the bottom wall of the main box 100. When multiple heat exchange flow channels 102 are provided, the multiple heat exchange flow channels 102 can be arranged at intervals or wound around each other. For example, the multiple heat exchange flow channels 102 include a first flow channel and a second flow channel, and at least part of the first flow channel is arranged inside the second flow channel. Among them, the heat exchange flow channel 102 can be integrally formed by stamping the main box 100 when stamping the main box 100, thereby reducing the processing steps and improving the processing efficiency.

[0115] The heat exchange flow channel 102 can include multiple straight segments and bending segments, the multiple straight segments extend along the first direction X and are arranged at intervals in the second direction Y, the multiple straight segments are sequentially connected along the fluid flow direction, and the two straight pipe segments connected in sequence are connected through the bending segment, and the bending angle of the bending segment can be 180°. In this way, not only can the heat exchange flow channel 102 extend back and forth in the first direction X, but also the structural strength of the bottom wall of the main box 100 can be improved.

[0116] The heat exchange channel 102 can further include a first inlet and outlet section and a second inlet and outlet section, both of which extend along the second direction Y and are arranged at intervals in the second direction Y, and are arranged on the same side of the plurality of straight sections in the first direction X and are connected to the two straight sections located at the outermost sides in the second direction Y among the plurality of straight sections. In this way, the inlet and outlet of the heat exchange channel 102 can be arranged side by side, and external pipelines can be conveniently connected.

[0117] Further, the bottom wall of the main box 100 is provided with a reinforcing rib, and the number of reinforcing ribs is one or more. The reinforcing rib extends along the first direction X and is arranged between two adjacent straight sections. In this way, the structural strength of the bottom wall of the main box 100 can be further improved. Further, the reinforcing rib can be formed by the bottom wall of the main box 100 being downwardly protruded, for example, the reinforcing rib is formed by stamping.

[0118] The heat exchange plate 300 is a flat plate, which can reduce the processing difficulty of the heat exchange plate 300 and improve the processing efficiency of the heat exchange plate 300.

[0119] In the above technical solution, the bottom wall of the main box 100 forms the heat exchange channel 102 with an open top, the heat exchange plate 300 is a flat plate and covers the heat exchange channel 102, and the heat exchange channel 102 extends in a bent manner. On the one hand, the flow path of the heat exchange channel 102 can be increased, and the heat exchange efficiency can be improved. On the other hand, the structure of the heat exchange plate 300 can be simplified, and the heat exchange channel 102 can be integrally formed by stamping when the main box 100 is stamped. Therefore, the processing steps can be reduced, the processing efficiency can be improved, and the processing cost can be reduced.

[0120] In some embodiments of the present application, as shown in FIGS. 10 and 11, the battery device 1000 further 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 connected to the main box 100 by welding. The battery device 1000 is adapted to be mounted on a power consumption device through the mounting beam 400.

[0121] The number of mounting beams 400 is two, and the two mounting beams 400 are arranged on opposite sides of the main box 100, respectively. The mounting beam 400 extends along the length direction of the main box 100 and extends from one end of the length direction of the main box 100 to the other end of the length direction of the main box 100. 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.

[0122] Further, the mounting beam 400 and the main box 100 can be connected by welding, for example, the mounting beam 400 and the main box 100 can be connected by laser welding, and the mounting beam 400 and the main box 100 can also be connected by resistance welding.

[0123] In the above technical solutions, the mounting beam 400 is arranged for the battery device 1000, and the mounting beam 400 and the main box 100 are connected by welding, so that the connection strength between the mounting beam 400 and the main box 100 is improved, the assembly efficiency is improved, the mounting beam 400 can also support the main box 100, the structural strength of the main box 100 is improved, and the battery device 1000 is convenient for assembly with the electric device 1.

[0124] Further, the mounting beam 400 and the main box 100 can also be connected by bonding, for example, the mounting beam 400 and the main box 100 are connected by structural adhesive bonding. In this way, the connection reliability between the mounting beam 400 and the main box 100 can be further improved.

[0125] In one example, the electric device 1 can be a vehicle, the mounting beam 400 can be detachably connected with the vehicle body, for example, the mounting beam 400 can be fastened with the vehicle body by fasteners.

[0126] In the above technical solutions, the mounting beam 400 is arranged for the battery device 1000, and the mounting beam 400 and the main box 100 are connected by welding, so that the connection strength between the mounting beam 400 and the main box 100 is improved, the assembly efficiency is improved, the mounting beam 400 can also support the main box 100, the structural strength of the main box 100 is improved, and the battery device 1000 is convenient for assembly with the electric device 1.

[0127] In some embodiments of the present application, as shown in FIG. 11, the mounting beam 400 includes a first plate 410 and a second plate 420 located on the lower side of the first plate 410, the first plate 410 and the second plate 420 are arranged in a stacked manner in the up-down direction and are connected, and the first plate 410 and the second plate 420 are fixedly connected with the main box 100.

[0128] In one example, the length direction of the first plate 410 is along the first direction X and the width direction is along the second direction Y, and the first plate 410 is a steel plate to improve the structural strength of the first plate 410. The length direction of the second plate 420 is along the first direction X and the width direction is along the second direction Y, and the second plate 420 is arranged on the lower side of the first plate 410 and is fixedly connected with the first plate 410, for example, the first plate 410 and the second plate 420 can be connected by welding, clamping or fastening. Further, 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.

[0129] The first plate 410 and the second plate 420 can be fixedly connected with the main box 100 respectively, so as 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 connected by welding, clamping, bonding and / or fasteners, further, the first plate 410 and the main box 100 can be connected by resistance welding and bonding.

[0130] In the above technical solution, the mounting beam 400 comprises the first plate 410 and the second plate 420 arranged in the up-down direction, and the first plate 410 and the second plate 420 are fixedly connected with the main box 100, which can simplify the structure of the mounting beam 400, facilitate the processing and forming of the mounting beam 400, and improve the connection reliability between the mounting beam 400 and the main box 100.

[0131] In some embodiments of the present application, as shown in FIG. 11, one side edge of the first plate 410 in the second direction Y is provided with a first folded edge 411 extending upward, and the first folded edge 411 is in close contact with and fixedly connected with the main box 100, and one side edge of the second plate 420 in the second direction Y is provided with a second folded edge 421 extending downward, and the second folded edge 421 is in close contact with and fixedly connected with the main box 100.

[0132] For example, the first plate 410 comprises a first main body and a first folded edge 411, the first main body is horizontally arranged, and the first folded edge 411 is connected to one side edge 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 by a circular arc. Further, in the direction of vertically upward, the first folded edge 411 extends obliquely toward the side where the first main body is located, so as to be in close contact with the outer surface of the side wall of the main box 100, wherein a part of the side surface of the first folded edge 411 facing the main box 100 can be in close contact with the main box 100, or the side surface of the first folded edge 411 facing the main box 100 can be completely in close contact with the main box 100.

[0133] Further, the first folded edge 411 and the main box 100 can be connected by welding, bonding and / or fasteners, for example, the first folded edge 411 and the side wall of the main box 100 are connected by resistance welding, and the upper end edge and the lower end edge of the first folded edge 411 are bonded with the side wall of the main box 100.

[0134] The second plate 420 comprises a second main body and a second folded edge 421, the second main body is horizontally arranged, the second folded edge 421 is connected to a side edge of the second main body facing the main box 100 and extends downward, and the second main body and the second folded edge 421 can be connected in a circular arc. Further, a part of a side surface of the second folded edge 421 facing the main box 100 can be attached to the main box 100, or the side surface of the second folded edge 421 facing the main box 100 can be completely attached to the main box 100.

[0135] Further, the second folded edge 421 and the main box 100 can be connected by welding, adhesive connection and / or fasteners, for example, the second folded edge 421 and the side wall of the main box 100 are connected by resistance welding, and the upper end edge and / or the lower end edge of the second folded edge 421 can be connected to the outer side surface of the main box 100 by adhesive connection.

[0136] In the above technical solution, the first plate 410 is attached to and fixedly connected to the main box 100 through the first folded edge 411, and the second plate 420 is attached to and fixedly connected to the main box 100 through the second folded edge 421, which can increase the cooperation 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.

[0137] In some embodiments of the present application, the lower end of the second folded edge 421 is provided with a third folded edge 422 extending toward the main box 100 along the second direction Y, and the third folded edge 422 is attached to and fixedly connected to the bottom wall of the main box 100.

[0138] For example, the third folded edge 422 can be in the shape of a horizontal plate body, the third folded edge 422 is connected to the lower end edge of the second folded edge 421 and extends away from the second main body along the second direction Y, and the third folded edge 422 and the second folded edge 421 can be connected in a circular arc to reduce stress concentration at the connection position of the third folded edge 422 and the second folded edge 421. Further, the third folded edge 422 and the bottom wall of the main box 100 can be connected by welding, adhesive connection and / or fasteners, for example, the two ends of the third folded edge 422 in the second direction Y are respectively connected to the main box 100 by adhesive connection.

[0139] In the above technical solution, the third folded edge 422 is connected to the lower end of the second folded edge 421 and is attached to and fixedly connected to the bottom wall of the main box 100, which can further increase the overlapping area between the second plate 420 and the main box 100, further improve the connection reliability between the second plate 420 and the main box 100, and 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.

[0140] In some embodiments of the present application, as shown in FIG. 12, the first plate 410 is formed with a plurality of first reinforcing protrusions 412 protruding upward, the plurality of first reinforcing protrusions 412 are arranged in the first direction X at intervals, the second plate 420 is formed with a plurality of second reinforcing protrusions 423 protruding downward, the plurality of second reinforcing protrusions 423 are arranged in the first direction X at intervals, and the plurality of first reinforcing protrusions 412 correspond to the plurality of second reinforcing protrusions 423 one by one and are opposite to each other in the up-down direction.

[0141] The number of the first reinforcing protrusions 412 can be two, three, four, five, seven, nine, ten or more, and the plurality of first reinforcing protrusions 412 can be arranged at intervals uniformly or non-uniformly in the first direction X. In this embodiment, the first plate 410 can be a stamping member, and the first reinforcing protrusions 412 can be formed by stamping and bending upward the portions of the first plate 410, so as to simplify the processing technology of the first plate 410. By arranging the plurality of first reinforcing protrusions 412 on the first plate 410, the structural strength of the first plate 410 can be improved, and the support stability of the mounting beam 400 to the battery device 1000 can be improved.

[0142] The number of the 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 arranged at intervals uniformly or non-uniformly in the first direction X. In this embodiment, the second plate 420 can be an integral stamping member, and the second reinforcing protrusions 423 can be formed by stamping and bending upward the portions of the second plate 420, so as to simplify the processing technology of the second plate 420. By arranging the plurality of second reinforcing protrusions 423 on the second plate 420, the structural strength of the second plate 420 can be improved, and the support stability of the mounting beam 400 to the battery device 1000 can be improved.

[0143] The first reinforcing protrusions 412 and the second reinforcing protrusions 423 are opposite to each other in the up-down direction, and when the first plate 410 and the second plate 420 are fixedly connected, the first reinforcing protrusions 412 and the second reinforcing protrusions 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 mounting the battery device 1000.

[0144] In this embodiment, the reinforcing beam structure can be a hollow beam. Specifically, the first reinforcing protrusions 412 define first grooves 4121 recessed upward, the second reinforcing protrusions 423 define second grooves 4231 recessed downward, the first grooves 4121 and the second grooves 4231 are opposite to each other and communicate with each other, and the first grooves 4121 and the second grooves 4231 jointly enclose a cavity of the reinforcing beam structure.

[0145] Further, the first groove 4121 penetrates the first plate 410 along the second direction Y, and a cross section of the first groove 4121 is trapezoidal, and in a direction from an opening of the first groove 4121 to a bottom, a width of the first groove 4121 in the first direction X gradually decreases. The second groove 4231 penetrates the second plate 420 along the second direction Y, and a cross section of the second groove 4231 is trapezoidal, and in a direction from an opening of the second groove 4231 to a bottom, a width of the second groove 4231 in the first direction X gradually decreases. In this way, the structure of the first reinforcing protrusion 412 and the second reinforcing protrusion 423 can be optimized, the first reinforcing protrusion 412 and the second reinforcing protrusion 423 can be conveniently formed by stamping, and the yield rate can be improved.

[0146] Further, the second reinforcing protrusion 423 is formed with a liquid leakage hole 4232 penetrating the second reinforcing protrusion 423 along the up-down direction. When liquid drops on the mounting beam 400, when the liquid flows into the second groove 4231, the liquid in the second groove 4231 can be discharged through the liquid leakage hole 4232, thereby reducing the accumulation of liquid in the second groove 4231 and reducing the risk of corrosion of the mounting beam 400.

[0147] In the above technical solution, a plurality of first reinforcing protrusions 412 and a plurality of second reinforcing protrusions 423 are respectively formed on the first plate 410 and the second plate 420, and the first reinforcing protrusions 412 and the second reinforcing protrusions 423 are opposite to each other in the up-down direction. The structural strength of the first plate 410 and the second plate 420 can be improved respectively, the overall structural strength of the mounting beam 400 can be improved, and the stability and reliability of the battery device 1000 when mounted by the mounting beam 400 can be improved.

[0148] In some embodiments of the present application, as shown in FIG. 12, the mounting beam 400 further includes a mounting column 430, the mounting column 430 extends vertically and sequentially passes through the first reinforcing protrusion 412 and the second reinforcing protrusion 423, and is fixed with the first reinforcing protrusion 412 and the second reinforcing protrusion 423. The mounting column 430 is formed with a mounting hole 431 extending along the up-down direction, and the battery device 1000 is adapted to be fixed with the electric device 1 by a fastener passing through the mounting hole 431.

[0149] In one example, the mounting column 430 is a steel material piece, the mounting column 430 is a cylindrical shape extending along the up-down direction, and defines the mounting hole 431 on the inner side. The first reinforcing protrusion 412 is formed with a first hole penetrating the first reinforcing protrusion 412 along the up-down direction, the second reinforcing protrusion 423 is formed with a second hole penetrating the second reinforcing protrusion 423 along the up-down direction, and the mounting column 430 sequentially passes through the first hole and the second hole, and is fixedly connected with the first plate 410 and the second plate 420.

[0150] Further, the upper end of the mounting column 430 protrudes upward beyond the upper end surface of the first reinforcing protrusion 412, and the lower end of the mounting column 430 protrudes downward beyond the lower end surface of the second reinforcing protrusion 423, so that the length of the mounting column 430 can be increased, and the mounting column 430 can enhance the protection and support effect of the fastener when the fastener is threaded into the mounting hole 431 of the mounting column 430, thereby improving the connection reliability between the battery device 1000 and the electric device 1.

[0151] In the above technical solution, the mounting column 430 is arranged on the mounting beam 400 and has the mounting hole 431, the mounting column 430 is fixed at the position 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 fastener threaded into the mounting hole 431, thereby improving the connection reliability between the battery device 1000 and the electric device 1.

[0152] In the above technical solution, the mounting column 430 is arranged on the mounting beam 400 and has the mounting hole 431, the mounting column 430 is fixed at the position 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 fastener threaded into the mounting hole 431, thereby improving the connection reliability between the battery device 1000 and the electric device 1.

[0153] In some embodiments of the present application, as shown in FIG. 11, the battery device 1000 further comprises a reinforcing plate 500, the reinforcing plate 500 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.

[0154] The number of reinforcing plates 500 is two, and the two reinforcing plates 500 are arranged on the inner sides of the two opposite side walls of the main box 100 in the second direction Y. Further, the reinforcing plate 500 is a steel plate, the length direction of the reinforcing plate 500 is along the first direction X, and the width direction of the reinforcing plate 500 is along the up-down direction, and the reinforcing plate 500 is attached to the inner side wall of the main box 100. The reinforcing plate 500 and the main box 100 can be connected by welding, fastening and / or bonding. For example, the reinforcing plate 500 and the main box 100 can be connected by resistance welding. By arranging the reinforcing plate 500 in the main box 100, the structural strength of the side wall 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.

[0155] The reinforcing plate 500 can be arranged inside and outside the first fold edge 411 to improve the structural strength of the portion of the side wall of the main tank 100 connected with the first fold edge 411. The reinforcing plate 500 can also be arranged inside and outside the second fold edge 421 to improve the structural strength of the portion of the side wall of the main tank 100 connected with the second fold edge 421. In addition, the reinforcing plate 500 can be arranged inside and outside both the first fold edge 411 and the second fold edge 421. Further, the reinforcing plate 500 can also be arranged inside and outside the third fold edge 422 of the second plate 420 to improve the structural strength of the portion of the bottom wall of the main tank 100 connected with the third fold edge 422.

[0156] In the above technical solution, the reinforcing plate 500 is arranged inside the main tank 100 to be arranged inside and outside the first fold edge 411 and the second fold edge 421, which can improve the structural strength of the connection between the main tank 100 and the first fold edge 411 and the second fold edge 421, and improve the connection reliability between the main tank 100 and the mounting beam 400.

[0157] In some embodiments of the present application, the reinforcing plate 500 includes a first reinforcing section 510 and a second reinforcing section 520. The first reinforcing section 510 is fixed to the side wall of the main tank 100. The second reinforcing section 520 is connected to the lower end of the first reinforcing section 510 and extends in the second direction Y. The second reinforcing section 520 is in contact with and fixed to the bottom wall of the main tank 100.

[0158] For example, the reinforcing plate 500 includes a first reinforcing section 510 extending in the vertical direction and a second reinforcing section 520 extending in the horizontal direction. 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. The upper end of the first reinforcing section 510 can extend to the upper end edge of the first fold edge 411 or be flush with the upper end edge of the first fold edge 411. The lower end of the first reinforcing section 510 extends to the bottom wall of the main tank 100. At this time, the first reinforcing section 510 can be arranged inside and outside both the first fold edge 411 and the second fold edge 421, thereby enhancing the reinforcing effect on the side wall of the main tank 100. Further, the second reinforcing section 520 is arranged inside and outside the third fold edge 422, and the side edge of the second reinforcing section 520 away from the first reinforcing section 510 in the second direction Y extends to the side edge of the third fold edge 422 away from the second fold edge 421 to enhance the reinforcing effect on the bottom wall of the main tank 100.

[0159] In the second direction Y, the end edge of the end of the second reinforcing section 520 away from the first reinforcing section 510 is arranged away from the side edge of the heat exchange plate 300 facing the mounting beam 400, so as to reduce the probability of interference between the second reinforcing section 520 and the heat exchange plate 300.

[0160] In some examples, the battery device 1000 further comprises a protective sheet 800 arranged in the accommodating cavity 101 and on the upper side of the second reinforcing section 520 and the heat exchange plate 300, one end of the protective sheet 800 covers the upper surface of the end of the second reinforcing section 520 away from the first reinforcing section 510 in the second direction Y, 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 reinforcing section 520, wherein the protective sheet 800 can be an insulating piece, and the protective sheet 800 can be adhesively connected to the heat exchange plate 300 and the second reinforcing section 520. Thus, the protective sheet can cover the side edges of the second reinforcing section 520 and the heat exchange plate 300 arranged opposite to each other, reduce the probability of the end of the second reinforcing section 520 and the end of the heat exchange plate 300 being warped, and reduce the risk of the edges of the second reinforcing section 520 and the heat exchange plate 300 piercing the battery monomer 200.

[0161] In the above technical solution, the reinforcing plate 500 can not only strengthen the structural strength of the side wall of the main tank 100 through the first reinforcing section 510, but also strengthen the structural strength of the bottom wall of the main tank 100 through the second reinforcing section 520, thereby further improving the structural strength of the main tank 100 and the connection reliability between the main tank 100 and the mounting beam 400.

[0162] In some embodiments of the present application, the first folded edge 411, the side wall of the main tank 100, and the reinforcing plate 500 are adhesively connected.

[0163] For example, the first folded edge 411, the side wall of the main tank 100, and the first reinforcing section 510 can be adhesively connected through resistance welding, specifically, the first folded edge 411, the side wall of the main tank 100, and the first reinforcing section 510 can be adhesively connected through resistance spot welding. Since the first folded edge 411 is made of steel, the side wall of the main tank 100 comprises the steel plate layer 110 and the aluminum plate layer 120, and the first reinforcing section 510 is made of steel, at this time, the material of the battery device 1000 from the outside to the inside at the welding position is steel-steel-aluminum-steel, since resistance welding can heat multiple layers of material at the same time, the welding and fixation of multiple layers of material at the same position are realized, in this way, the first plate 410 and the reinforcing plate 500 do not need to be welded to the main tank 100 in multiple times, the welding efficiency between the first folded edge 411, the main tank 100, and the reinforcing plate 500 is improved, and the integrity of the mounting beam 400, the main tank 100, and the reinforcing plate 500 is enhanced.

[0164] In the above technical solution, the first folded edge 411, the main tank 100, and the reinforcing plate 500 are adhesively connected, which can improve the welding efficiency between the first folded edge 411, the main tank 100, and the reinforcing plate 500, and enhance the integrity of the mounting beam 400, the main tank 100, and the reinforcing plate 500.

[0165] In some embodiments of the present application, as shown in FIG. 13, the battery device 1000 further comprises: an expansion beam 600, which is arranged in the accommodating cavity 101 and is welded to the main box 100.

[0166] For example, the battery device 1000 can comprise two expansion beams 600, both of which extend along the second direction Y and are arranged at intervals in the first direction X, and the plurality of battery monomers 200 are arranged between the two expansion beams 600, which can cooperate with each other to limit the plurality of battery monomers 200 and limit the deformation of the plurality of battery monomers 200.

[0167] The expansion beam 600 is arranged in the accommodating cavity 101 and is fixedly connected to the main box 100, wherein the fixed connection of the expansion beam 600 to the main box 100 can enhance the structural strength of the main box 100 and improve the anti-deformation capability of the main box 100. In addition, the expansion beam 600 can be in contact with the main box 100 and the battery monomers 200, thereby playing a role of heat conduction and being conducive to improving the heat dissipation performance of the battery monomers 200.

[0168] 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. The welded connection of the expansion beam 600 and the main box 100 can improve the assembly efficiency and connection reliability between the expansion beam 600 and the main box 100. Compared with fastening connection, the welded connection can also reduce the number of parts and save costs.

[0169] In one example, the expansion beam 600 comprises a plurality of sheet metal parts, which are welded to each other to constitute the expansion beam 600, and the plurality of sheet metal parts are all steel plates. Specifically, the plurality of sheet metal parts of the expansion beam 600 comprise: a first beam plate 610, a second beam plate 620, and a reinforcing 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 towards the second beam plate 620, and the lower end is provided with a second connecting edge bent towards the second beam plate 620. The upper end of the second beam plate 620 is provided with a third connecting edge bent towards the first beam plate 610, and the lower end is provided with a fourth connecting edge bent away from the first beam plate 610.

[0170] 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 bonded.

[0171] Further, 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. A cross section of the reinforcing portion perpendicular to the second direction Y is U-shaped. An open end of the U-shaped reinforcing portion faces the first beam plate 610. The other end of the reinforcing portion protrudes towards the second beam plate 620 and is fixedly connected with the second beam plate 620. The vertical plate portion is connected on both sides of the reinforcing portion in the vertical direction and extends away from the reinforcing portion in the up-down direction. The vertical plate portion is fixedly attached to the first beam plate 610.

[0172] Further, the reinforcing beam plate 630 further comprises an extension portion extending along the first direction X. One end of the extension portion is connected with the lowermost vertical plate portion and extends downwardly and obliquely. 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. The portion of the extension portion outside the beam cavity 601 is fixedly connected with the bottom wall of the main box 100.

[0173] The extension portion and the bottom wall of the main box 100 can be connected by welding and / or bonding. In a specific example, the extension portion and the bottom wall of the main box 100 are connected by welding. Further, the extension portion and the bottom wall of the main box 100 are connected by resistance welding. The materials to be welded from top to bottom at the welding position of the extension portion and the bottom wall of the main box 100 are steel-aluminum-steel. The resistance welding used in this embodiment can simultaneously heat the multiple layers of materials at this position, realize the welding and fixation of the three layers of steel-aluminum-steel, improve the welding efficiency, and enhance the structural strength of the welding.

[0174] In the above technical solution, the expansion beam 600 can enhance the structural strength of the main box 100 and improve the anti-deformation capability of the main box 100. The expansion beam 600 can also play a role in heat conduction, improve the heat dissipation performance of the battery monomer 200, and the expansion beam 600 is connected with the main box 100 by welding, which can improve the assembly efficiency, reduce the number of parts, and reduce the cost.

[0175] In some embodiments of the present application, as shown in FIGS. 10 and 14, the battery device 1000 further comprises a connecting bracket 700 and a bottom guard plate (not shown). The connecting bracket 700 is arranged on the outside of the main box 100 and is fixedly connected with the main box 100. The bottom guard plate is arranged on the lower side of the main box 100 and is connected with the main box 100 through the connecting bracket 700.

[0176] The bottom guard plate can be a metal plate or a non-metal plate with 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, the bottom guard plate can protect the bottom wall of the main box 100 and avoid direct impact on the bottom wall of the main box 100 when the battery device 1000 is subjected to bottom impact, thereby improving the reliability of the battery device 1000.

[0177] The bottom guard plate is fixedly connected with the main box 100 through the connecting bracket 700, so that the bottom guard plate can be more conveniently fixed, and the connecting bracket 700 can also play a role in structural reinforcement of the main box 100.

[0178] The connecting bracket 700 and the main box 100 can be connected by welding, bonding, clamping or fastening. Further, the connecting bracket 700 and the main box 100 can be connected by resistance welding.

[0179] The number of the connecting bracket 700 can be one, or a plurality of which are arranged at intervals. For example, the battery device 1000 can include two connecting brackets 700, and the two connecting brackets 700 are arranged at intervals in the first direction X.

[0180] In the above technical solution, the bottom guard plate is fixedly connected with the main box 100 through the connecting bracket 700, so that the bottom guard plate can be more conveniently fixed, and the connecting bracket 700 can also play a role in structural reinforcement of the main box 100.

[0181] In some embodiments of the present application, as shown in FIG. 14, the connecting bracket 700 includes a main bracket 710 and an inclined bracket 720. The main bracket 710 is arranged on the lower side of the bottom wall of the main box 100, and the edge of the main bracket 710 is formed with at least one lug 711 which protrudes from the periphery of the bottom wall of the main box 100. The inclined bracket 720 includes a first segment 721, an inclined segment 722 and a second segment 723 which are connected in sequence. The first segment 721 is a horizontal plate body and is arranged on the upper side of the lug 711 and fixedly connected with the lug 711. The second segment 723 is an up-and-down extending plate body and is fitted and fixedly connected with the side wall of the main box 100. In the direction from the first segment 721 to the second segment 723, the inclined segment 722 extends upwardly and obliquely.

[0182] The connecting bracket 700 can be a metal piece, for example, the connecting bracket 700 is a steel piece. The main bracket 710 is a steel plate, and the inclined bracket 720 is also a steel plate. In this way, the structural strength of the connecting bracket 700 can be improved.

[0183] The main bracket 710 is horizontally arranged, and both ends of the main bracket 710 in the second direction Y extend to both ends of the bottom wall of the main box 100 in the second direction Y, so as to improve the structural reinforcement effect of the main bracket 710 on the bottom wall of the main box 100.

[0184] In the first direction X, the main support plate 710 is provided with a plurality of lugs 711 on the side edge adjacent to the side wall of the main box 100, and the plurality of lugs 711 are arranged at intervals in the second direction Y. The lug 711 is a horizontal plate extending in the first direction X, and the two side edges of the lug 711 in the second direction Y are bent upward to improve the structural strength of the lug 711. The number of lugs 711 can be two, three, four, five, seven or more.

[0185] The inclined support plate 720 is arranged inclined to the horizontal direction and connected between the lug 711 and the side wall of the main box 100. The inclined support plate 720 not only increases the connection area between the connection bracket 700 and the main box 100, but also connects the connection bracket 700 with the bottom wall and the side wall of the main box 100, thereby improving the connection reliability between the connection bracket 700 and the main box 100. On the other hand, the inclined support plate 720, the lug 711 and the side wall of the main box 100 can form a triangular connection structure, thereby further improving the connection stability between the connection bracket 700 and the main box 100.

[0186] Further, the first section 721 is connected with the inclined section 722 by an arc, and the second section 723 is also connected with the inclined section 722 by an arc to reduce stress concentration.

[0187] In the above technical solution, the main support plate 710 can play a role in strengthening the structure of the bottom wall of the main box 100, improving the overall structural strength of the battery device 1000, and increasing the contact area with the main box 100 to improve the reliability of the fixed connection of 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 improve the structural strengthening effect of the connection bracket 700 on the main box 100 and improve the connection reliability between the connection bracket 700 and the main box 100.

[0188] In some embodiments of the present application, the first section 721 is welded to the side wall of the main box 100.

[0189] For example, the first section 721 and the side wall of the main box 100 can be connected by resistance welding. Specifically, the first section 721 and the side wall of the main box 100 can be resistance spot welded. In the welding position of the first section 721 and the side wall of the main box 100, the materials to be welded are steel-aluminum-steel. The resistance welding of the present embodiment can heat the multiple layers of materials at this position at the same time, realize the welding and fixation of the three layers of steel-aluminum-steel, improve the welding efficiency, and enhance the structural strength of the welding.

[0190] Further, the upper end of the first section 721 and the side wall of the main box 100 are connected by adhesion, and the lower end of the first section 721 and the side wall of the main box 100 are also connected by adhesion.

[0191] In one example, the second section 723 and the lug 711 can be connected by resistance welding, and in this case, the second section 723 and the lug 711 are welded by two layers of steel plates. Further, the two ends of the second section 723 in the first direction X are respectively connected to the lug 711 by bonding, so as to improve the connection reliability between the second section 723 and the lug 711.

[0192] In the above technical solution, the first section 721 and the side wall of the main box 100 are connected by welding, which can improve the connection reliability between the first section 721 and the main box 100 and improve the assembly efficiency.

[0193] In a second aspect, the embodiments of the present application also provide a battery device 1000.

[0194] In the above technical solution, since the battery device 1000 is arranged on the electric device 1, and the main box 100 of the battery device 1000 includes the aluminum plate layer 120 and the steel plate layer 110 arranged in a stack, 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, the aluminum plate layer 120 can improve the heat dissipation efficiency of the battery monomer 200, reduce the probability of local overheating in the battery device 1000, and improve the energy density of the battery device 1000, thereby improving the overall performance of the electric device 1.

[0195] Hereinafter, the battery device 1000 according to one specific embodiment of the present application will be described with reference to FIGS. 2-14.

[0196] Referring to FIGS. 2-5, the battery device 1000 includes a box body, a plurality of battery monomers 200, a heat exchange plate 300, two mounting beams 400, two reinforcing plates 500, two expansion beams 600, two connecting brackets 700, and a bottom guard plate. The box body includes a main box 100, the main box 100 defines an accommodating cavity 101 with an open top, the heat exchange plate 300, the reinforcing plate 500, and the expansion beam 600 are all arranged in the accommodating cavity 101, and the mounting beam 400, the connecting bracket 700, and the bottom guard plate are arranged on the outside of the main box 100.

[0197] The main box 100 is integrally stamped and formed by a steel-aluminum composite plate, and the bottom wall and the side wall 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 inside of the accommodating cavity 101, a heat exchange flow channel 102 with an open top is formed on the bottom wall of the main box 100, the heat exchange flow channel 102 reciprocally extends 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 flow channel 102, and the heat exchange plate 300 is connected to the main box 100 by brazing.

[0198] The two expansion beams 600 extend along the second direction Y and are arranged at intervals along 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 of the laminated three-layer steel-aluminum-steel material.

[0199] The plurality of battery cells 200 are arranged between the two expansion beams 600. Specifically, the plurality of battery cells 200 are arranged as four battery cell assemblies, each of which includes a plurality of battery cells 200 arranged in layers along the first direction X, and the plurality of battery cell assemblies are arranged in sequence along the second direction Y.

[0200] The two reinforcing plates 500 are respectively attached to the two side walls of the main box 100 opposite 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 beam 400 includes a first plate 410 and a second plate 420 arranged in layers, and 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 wall of the main box 100, and the third folded edge 422 is attached to the bottom wall of the main box 100. The first folded edge 411, the second folded edge 421, and the third folded edge 422 are opposite inside and outside 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 of the laminated four-layer steel-aluminum-steel material.

[0201] The two connecting brackets 700 are arranged at the two ends of the main box 100 in the first direction X. The connecting bracket 700 includes a main plate 710 and a plurality of inclined plates 720. The main 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 plate 710 in the first direction X is provided with a plurality of lugs 711 arranged at intervals along the second direction Y. One end of the inclined plate 720 is attached to and connected with the lug 711. The other end of the inclined plate 720 extends upward and obliquely toward the side wall of the main box 100. The upper end of the inclined plate 720 is attached to the side wall of the main box 100 and is connected and fixed by resistance spot welding of the three-layer steel-aluminum-steel material.

[0202] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device (1000), wherein, The application relates to a battery device (1000), which comprises: a main box (100) defining a top-open containing cavity (101), the main box (100) comprising a steel plate layer (110) and an aluminum plate layer (120) arranged in a thickness direction, the aluminum plate layer (120) being arranged on a side of the steel plate layer (110) facing the containing cavity (101); a battery monomer (200) arranged in the containing cavity (101).

2. The battery device (1000) according to claim 1, wherein The main box (100) is integrally punched and formed by a steel-aluminum composite plate.

3. The battery device (1000) according to claim 1 or 2, wherein The battery device (1000) further comprises a heat exchange plate (300) made of an aluminum plate, the heat exchange plate (300) being arranged in the containing cavity (101) and being connected with the aluminum plate layer (120) by brazing, the heat exchange plate (300) and a bottom wall of the main box (100) cooperatively defining a heat exchange flow channel (102), and the battery monomer (200) being arranged on an upper side of the heat exchange plate (300).

4. The battery device (1000) according to claim 3, wherein The bottom wall of the main box (100) forms the heat exchange flow channel (102) extending in a bending manner and top-open, and the heat exchange plate (300) is a flat plate and covers a top-open side of the heat exchange flow channel (102).

5. The battery device (1000) according to any one of claims 1-4, wherein, The application further comprises a mounting beam (400) extending along a first direction (X) and arranged on both sides of the main box (100) in a second direction (Y), the mounting beam (400) being arranged outside the containing cavity (101) and being connected with the main box (100) by welding, and the battery device (1000) being adapted to be mounted on an electric device (1) through the mounting beam (400).

6. The battery device (1000) according to claim 5, wherein The mounting beam (400) comprises a first plate (410) and a second plate (420) arranged below the first plate (410), the first plate (410) and the second plate (420) being arranged in a stacking manner and being connected in an up-down direction, and the first plate (410) and the second plate (420) being connected with the main box (100).

7. The battery device (1000) according to claim 6, wherein One side edge of the first plate (410) in the second direction (Y) is provided with a first folding edge (411) extending upwards, the first folding edge (411) being in abutment with and fixedly connected with the main box (100), One side edge of the second plate (420) in the second direction (Y) is provided with a second folding edge (421) extending downwards, the second folding edge (421) being in abutment with and fixedly connected with the main box (100).

8. The battery device (1000) according to claim 7, wherein A lower end of the second folding edge (421) is provided with a third folding edge (422) extending towards the main box (100) along the second direction (Y), the third folding edge (422) being in abutment with and fixedly connected with a bottom wall of the main box (100).

9. The battery device (1000) according to any one of claims 6-8, wherein, The first plate (410) is formed with a plurality of first reinforcing protrusions (412) protruding upward, 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, the plurality of second reinforcing protrusions (423) are arranged at intervals along the first direction (X), the plurality of first reinforcing protrusions (412) correspond to the plurality of second reinforcing protrusions (423) one by one and are opposite to each other in the up-down direction.

10. The battery device (1000) according to claim 9, wherein The mounting beam (400) further comprises a mounting column (430) vertically extending and sequentially penetrating through the first reinforcing protrusion (412) and the second reinforcing protrusion (423) and being fixed with the first reinforcing protrusion (412) and the second reinforcing protrusion (423), the mounting column (430) is formed with a mounting hole (431) extending along the up-down direction, and the battery device (1000) is adapted to be fixed with the electric device by a fastener penetrating through the mounting hole (431).

11. The battery device (1000) according to claim 7 or 8, wherein The battery device (1000) further comprises a reinforcing plate (500) arranged in the accommodating cavity (101), the reinforcing plate (500) is fixedly connected with the side walls of the main box (100) in the second direction (Y) and is 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, wherein The reinforcing plate (500) comprises a first reinforcing section (510) and a second reinforcing section (520), the first reinforcing section (510) is fixed with the side wall of the main box (100), the second reinforcing section (520) is connected to the lower end of the first reinforcing section (510) and extends along the second direction (Y), and the second reinforcing section (520) is in abutment and fixed connection with the bottom wall of the main box (100).

13. The battery device (1000) according to claim 11 or 12, wherein The first folding edge (411), the side wall of the main box (100) and the reinforcing plate (500) are welded and connected.

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

15. The battery device (1000) according to any one of claims 1-14, wherein, The battery device (1000) further comprises: a connecting support (700) arranged on the outside of the main box (100) and fixedly connected with the main box (100); a bottom guard plate arranged on the lower side of the main box (100), the bottom guard plate being connected with the main box (100) through the connecting support (700).

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

17. The battery device (1000) according to claim 16, wherein The first section (721) is weldedly connected with the side wall of the main box (100).

18. An electrically powered device (1), wherein A battery device (1000) according to any one of claims 1-17.

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