Battery device and electric device

Abstract

A battery device (1000), comprising a first expansion beam (100), a case body (200), a battery cell (300), a thermal management assembly (400), a reinforcing beam (500), and a mounting beam (600). The battery cell (300) is arranged in the case body (200); the mounting beam (600) is mounted in the case body (200), and is provided with a notch (610) running therethrough; the first expansion beam (100) is mounted in the case body (200) by means of the mounting beam (600) and fits the battery cell (300); the first expansion beam (100), the mounting beam (600), and a bottom wall (202) of the case body (200) jointly define a clearance channel (203) communicated with the notch (610); the thermal management assembly (400) is arranged in the case body (200) and adapted to exchange heat with the battery cell (300); and the thermal management assembly (400) comprises an inlet portion (411) and an outlet portion (412), and at least one of the inlet portion (411) and the outlet portion (412) passes through the clearance channel (203). The battery device (1000) further comprises the reinforcing beam (500) arranged at the notch (610). The reinforcing beam (500) is connected to the walls of the mounting beam (600) located on two sides of the notch (610), and is also connected to the first expansion beam (100).

Description

Battery device and power consuming device

[0001] Priority information

[0002] The present application claims priority to and the benefit of the filing date of Chinese Patent Application No. 202421842958.0, filed on July 31, 2024, and which is incorporated herein by reference in its entirety. TECHNICAL FIELD

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

[0004] In a battery device, an expansion beam is designed to be located on one side of a battery cell to bear and control the pressure generated by the expansion of the battery cell, so as to prevent the deformation or damage of the box. In the related art, the expansion beam may not effectively disperse and absorb the force generated by the expansion of the battery cell due to the limitations of the elastic modulus of the material, the geometric shape, or the connection mode, which may cause the deformation of the expansion beam itself, and even functional failure, so that the overall anti-expansion ability of the battery cell of the expansion beam is low. SUMMARY

[0005] The present application provides a battery device and a power consuming device to solve at least one of the above technical problems.

[0006] The battery device of the present application includes a box, a battery cell, a mounting beam, a first expansion beam, and a thermal management assembly. The battery cell is arranged in the box; the mounting beam is arranged in the box and penetrates a notch; the first expansion beam is arranged in the box through the mounting beam and cooperates with the battery cell, and the first expansion beam, the mounting beam, and the bottom wall of the box jointly form an avoiding channel that is in communication with the notch; the thermal management assembly is arranged in the box and cooperates with the battery cell in heat exchange, and the thermal management assembly includes an inlet portion and an outlet portion; at least one of the inlet portion and the outlet portion penetrates the avoiding channel.

[0007] The battery device further includes a reinforcing beam arranged at the notch, the reinforcing beam is connected with the wall bodies on both sides of the notch of the mounting beam and connected with the first expansion beam.

[0008] In the battery device of the present application, the reinforcing beam, the mounting beam, and the first expansion beam can form a continuous structure, and the reinforcing beam can cooperate with the mounting beam to support the first expansion beam, so that the stability of the first expansion beam is high. This can effectively disperse the expansion force of the battery cell on the first expansion beam, avoid the local stress of the first expansion beam being too large, make the distribution of the force more uniform, and thus improve the ability of the first expansion beam to resist the expansion force of the battery cell.

[0009] In addition, the avoidance channel can provide space for the inlet or outlet of the thermal management assembly, thereby improving the overall space utilization of the battery device.

[0010] In some embodiments, the reinforcing beam is transversely arranged at the notch and connected to the walls on both sides of the notch formed by the mounting beam.

[0011] In this way, the reinforcing beam occupies less space, which is conducive to improving the space utilization of the battery device.

[0012] In some embodiments, the reinforcing beam covers the notch and is connected to the walls on both sides of the notch adjacent to the mounting beam.

[0013] In this way, the connection area between the reinforcing beam and the mounting beam is larger, which can improve the stability of the reinforcing beam itself, so that the reinforcing beam can stably support the first expansion beam, thereby improving the ability of the first expansion beam to resist the expansion force of the battery cell.

[0014] In some embodiments, the reinforcing beam comprises a first reinforcing portion and a second reinforcing portion connected at an angle, the first reinforcing portion is connected to the mounting beam, and the second reinforcing portion is connected to the first expansion beam.

[0015] In this way, due to the angle arrangement of the first reinforcing portion and the second reinforcing portion, the reinforcing beam can provide additional support when connected to the mounting beam and the first expansion beam, increase the rigidity of the overall structure of the reinforcing beam, the mounting beam and the first expansion beam, and help to improve the stability and torsional capacity of the overall structure, thereby improving the ability of the first expansion beam to resist the expansion force of the battery cell.

[0016] In addition, the first reinforcing portion and the second reinforcing portion connected at an angle make the reinforcing beam have a larger mounting space, which facilitates the connection between the reinforcing beam and the mounting beam and the first expansion beam.

[0017] In some embodiments, the mounting beam comprises a first beam, a second beam and a third beam connected at an angle in sequence, the first beam and the third beam are both connected to the bottom wall of the box, and the first beam is closer to the battery cell than the third beam; the first reinforcing portion is connected to the third beam, and the second reinforcing portion is connected to the second beam.

[0018] In this way, due to the angle arrangement of the first beam, the second beam and the third beam, a frame structure can be formed between the mounting beam and the bottom wall of the box, which can increase the structural strength of the mounting beam, thereby improving the stability between the mounting beam and the first expansion beam and the reinforcing beam, and further improving the ability of the first expansion beam to resist the expansion force of the battery cell.

[0019] In addition, the first beam, the second beam and the third beam connected at an angle make the mounting beam have a larger mounting space, which facilitates the connection between the mounting beam and the reinforcing beam and the first expansion beam.

[0020] In some embodiments, the number of the notch is one or more; when the number of the notch is more than one, the number of the mounting beam is more than one and corresponds to the number of the notch.

[0021] In this way, the plurality of mounting beams can provide a plurality of support points, thereby dispersing the stress of the first expansion beam to improve the ability of the first expansion beam to resist the expansion force of the battery cell.

[0022] In some embodiments, when the number of the notch is more than one, the number of the mounting beam is one, and one mounting beam is opposite to the plurality of notches.

[0023] In this way, the notch can be formed on one mounting beam, which facilitates the manufacturing of the mounting beam and helps to reduce the manufacturing cost.

[0024] In some embodiments, the heat management assembly is formed by bending the heat exchange pipe, and the inlet part and the outlet part of the heat exchange pipe are arranged adjacent to each other, so that the inlet part and the outlet part of the heat exchange pipe are both arranged in the notch.

[0025] In this way, the heat management assembly is formed by bending the heat pipe, which can increase the contact area between the battery cell and the heat management assembly, thereby improving the heat exchange effect between the heat management assembly and the battery cell.

[0026] In addition, the notch can provide a passage for the inlet part and the outlet part, thereby facilitating the layout of the heat management assembly.

[0027] In some embodiments, the number of the heat exchange pipe is more than one, the plurality of inlet parts and the plurality of outlet parts of the plurality of heat exchange pipes are arranged adjacent to each other and are arranged in one notch.

[0028] In this way, the heat exchange pipe occupies a smaller space, which helps to improve the space utilization of the battery device.

[0029] In some embodiments, the number of the heat exchange pipe is more than one, and the number of the notch is also more than one, the inlet part and the outlet part of each heat exchange pipe are arranged in one notch.

[0030] In this way, the inlet part and the outlet part of each heat exchange pipe are arranged independently, which can reduce the interference between adjacent or nearby inlet parts or outlet parts and facilitate the maintenance of the inlet part and the outlet part.

[0031] In some embodiments, the heat exchange pipe gradually extends from the outer periphery of the battery device to the middle position of the battery device and is bent.

[0032] In this way, the contact area between the heat exchange pipe and the battery cell is large, which can improve the heat exchange effect between the heat exchange pipe and the battery cell.

[0033] In some embodiments, the number of heat exchange pipes is multiple, and the heat exchange pipes are arranged in parallel.

[0034] In this way, interference between multiple heat exchange pipes is less likely to occur.

[0035] In some embodiments, the bottom wall is formed with a mounting groove, and the heat exchange pipe is arranged in the mounting groove and extends along the extension direction of the mounting groove.

[0036] In this way, the arrangement of the mounting groove can facilitate the arrangement of the heat exchange pipe, reduce the space occupied by the heat exchange pipe inside the box, compact the structure, and improve the energy density of the battery device.

[0037] In some embodiments, the first expansion beam includes multiple plates, and the multiple plates are sheet metal parts, and the multiple plates are welded to form the first expansion beam.

[0038] In this way, since the multiple plates are welded to form an integrated first expansion beam, the structure of the first expansion beam can be simplified, the first expansion beam can be conveniently formed, and the cost can be reduced. In addition, the plates are sheet metal parts, which can improve the structural strength of the plates and the structural strength of the first expansion beam.

[0039] In some embodiments, the first expansion beam includes multiple plates arranged in connection, and the multiple plates respectively include: a first plate and a second plate, the first plate and the second plate extend in a first direction and are arranged in a second direction, in a third direction, two ends of the first plate are connected to two ends of the second plate respectively, and cooperate to define a cavity of the first expansion beam, and the first direction, the second direction and the third direction intersect with each other.

[0040] In this way, since the multiple plates include the first plate and the second plate, and the first plate and the second plate are connected to define the cavity of the first expansion beam, the composition structure of the first expansion beam can be simplified, the processing can be facilitated, and the cost can be reduced.

[0041] In some embodiments, in the third direction, the two ends of the first plate have a first flange and a second flange extending towards the second plate, the two ends of the second plate have a third flange and a fourth flange extending towards the first plate, the first flange is connected to the third flange in overlap, and the second flange is connected to the fourth flange in overlap.

[0042] Thus, since the first flange and the second flange of the first plate are respectively connected to the third flange and the fourth flange of the second plate by overlapping, the structure is simple, the first plate and the second plate can be conveniently connected by welding, the structural strength of the welding position can be improved, and the structural strength of the first expansion beam can be improved.

[0043] In some embodiments, the second plate comprises a main plate and a support plate arranged separately, the main plate is arranged on the side of the support plate away from the bottom wall in the third direction, the main plate is provided with a first flange extending away from the second plate in the second direction, the support plate is provided with a second flange extending away from the second plate in the second direction, and the first flange and the second flange are arranged in layers and connected.

[0044] Thus, by arranging the second plate to comprise a main plate and a support plate arranged separately, the production difficulty of the second plate can be reduced, and the processing efficiency can be improved; at the same time, by connecting the main plate and the support plate by overlapping and welding through the first flange and the second flange respectively, the structural strength of the second plate can be improved, and the main plate and the support plate can be conveniently connected by welding.

[0045] In some embodiments, the first flange is formed with a plurality of first fixing holes penetrating through the first flange in the third direction, a plurality of the first fixing holes are arranged at intervals in the first direction, the first expansion beam is connected to the mounting beam by being fastened in one part of the first fixing holes, and the first expansion beam is connected to the reinforcing beam by being fastened in another part of the first fixing holes.

[0046] Thus, the first flange is provided with a plurality of first fixing holes for fastening connection with the mounting beam, thereby the first expansion beam can be conveniently connected to the mounting beam and the reinforcing beam by fasteners, and the plurality of first fixing holes can improve the reliability and uniformity of the force between the first expansion beam and the mounting beam and the reinforcing beam.

[0047] In some embodiments, the first flange comprises a plurality of connecting portions and a plurality of recessed portions, a plurality of the recessed portions and a plurality of the connecting portions are arranged alternately and connected in the first direction, the recessed portions are recessed and formed by the first flange towards the support plate, each of the recessed portions is formed with at least one first fixing hole,

[0048] The second flange comprises a plurality of first lugs extending away from the first plate in the second direction, a plurality of the first lugs are arranged at intervals in the first direction, and an avoidance portion is defined between adjacent two of the first lugs,

[0049] Among them, the recessed portion is located in the avoidance portion, a plurality of the connecting portions and a plurality of the first lugs correspond one by one and are connected.

[0050] Thus, since the first folded edge is formed with the plurality of recesses, the plurality of recesses can improve the structural strength of the first folded edge, improve the reliability when the first folded edge is connected with the box, and since the recesses are located in the avoiding portions, the first lugs can be flush with the lower side surfaces of the recesses or the recesses can protrude from the lower side surfaces of the first lugs, so that the recesses can abut against the connected components when connected with the mounting beam, thereby improving the reliability of the fastening connection.

[0051] In some embodiments, the support plate is formed with a first avoiding groove recessed toward the main plate on a side edge of the main plate away from the main plate in the third direction, the reinforcing beam is formed with a second avoiding groove, and the first avoiding groove and the second avoiding groove are arranged in the second direction.

[0052] Thus, by arranging the first avoiding groove and the second avoiding groove for avoiding the inlet portion and the outlet portion on the support plate and the reinforcing beam respectively, the mutual interference between the support plate and the inlet portion and the outlet portion can be reduced, and the layout can be more compact and reasonable.

[0053] In some embodiments, the plurality of plate bodies further include a reinforcing plate, the reinforcing plate extends in the first direction, the reinforcing plate is arranged between the first plate and the second plate, and the reinforcing plate is connected with the first plate and the second plate.

[0054] Thus, since the reinforcing plate is arranged between the first plate and the second plate, the reinforcing plate can strengthen the overall structural strength of the first expansion beam and improve the anti-expansion effect on the battery monomer.

[0055] In some embodiments, the reinforcing plate includes a flat plate portion and a bent portion, the flat plate portion is attached to and connected with the surface of the first plate, and the bent portion is connected with the flat plate portion and formed in a U-shaped structure extending in the first direction and opening toward the first plate in the second direction.

[0056] Thus, by arranging the reinforcing plate to include the flat plate portion connected with the first plate and the bent portion protruding and bent toward the second plate, the reinforcing plate can not only be conveniently welded and connected with the first plate and the second plate, but also improve the structural strength of the reinforcing plate and the overall strength of the first expansion beam.

[0057] In some embodiments, the number of the bent portions is a plurality, the plurality of bent portions are arranged in the third direction, and the flat plate portion is connected between two adjacent bent portions and on both sides of the plurality of bent portions in the third direction.

[0058] Therefore, by arranging multiple bending portions on the reinforcing plate, the structural strength of the reinforcing plate, the structural strength of the first expansion beam, and the uniformity of the structural reinforcement of the reinforcing plate on the first plate and the second plate in the height direction of the first expansion beam can be further improved, and the weak area of the first expansion beam can be reduced.

[0059] In some embodiments, the reinforcing plate further comprises a third bending edge connected to the flat plate portion, the third bending edge having multiple second lugs extending away from the first plate in the second direction, the multiple second lugs being arranged at intervals in the first direction, and the multiple second lugs being clamped between and welded to the first bending edge and the second bending edge.

[0060] Therefore, since the reinforcing plate further comprises the third bending edge connected between the first bending edge and the second bending edge, the third bending edge can improve the connection strength of the connection position of the first bending edge and the second bending edge, and improve the reliability of the fastening connection of the first bending edge and the box. Meanwhile, the multiple second lugs arranged at intervals can define the avoiding holes of the avoiding recess of the first bending edge, and reduce the probability of interference between the third bending edge and the fastener arranged in the first fixing hole.

[0061] In some embodiments, the battery device further comprises a first connecting plate and a second connecting plate. The first connecting plate is fixed to the side wall of the box by a fastener, and the first plate is provided with a first connecting hole penetrating the first plate in the second direction at both ends of the first plate in the first direction. The first plate is fastened to the first connecting plate by a fastener penetrating the first connecting hole. The second connecting plate is fixed to the side wall of the box by a fastener, and the second plate is provided with a second connecting hole penetrating the second plate in the second direction at both ends of the second plate in the first direction. The second plate is fastened to the second connecting plate by a fastener penetrating the second connecting hole.

[0062] Therefore, the two sides of the first expansion beam in the thickness direction are fixed to the inner wall of the box by the first connecting plate and the second connecting plate, respectively. Therefore, not only can the fastening connection of the first expansion beam and the box be conveniently realized, but also the connection reliability between the first expansion beam and the box can be improved.

[0063] In some embodiments, the battery device further comprises a bracket fixed to the bottom wall and arranged at the notch, and the reinforcing beam is supported on the bracket.

[0064] Therefore, the bracket can improve the stability of the reinforcing beam, thereby improving the structural strength of the first expansion beam, and further improving the ability of the first expansion beam to resist the expansion force of the battery cell.

[0065] In some embodiments, the support frame comprises a support plate and a plurality of support legs arranged along a circumferential direction of the support plate, each of the support legs comprises a support section and an extension section arranged in an L shape, the support section is connected to the bottom wall, the extension section extends away from the support section along a third direction, the support plate is connected to an end of the extension section of each of the support legs away from the support section, and the reinforcing beam is supported on the support plate and fixed to the support plate by fasteners.

[0066] Thus, since the support frame comprises a support plate and a plurality of support legs supporting the support plate, the structure of the support frame can be simplified, the stability of the support frame in supporting the reinforcing beam can be improved, and the reinforcing beam can be conveniently fixed to the support frame.

[0067] In some embodiments, the battery device further comprises a second expansion beam extending along the first direction and arranged in the second direction away from the first expansion beam, the battery cells are arranged between the first expansion beam and the second expansion beam, and the structure of the second expansion beam is the same as or different from that of the first expansion beam.

[0068] Thus, since the battery device further comprises a second expansion beam, the second expansion beam can cooperate with the first expansion beam to jointly inhibit the expansion of the battery cells in the second direction.

[0069] The power consuming device according to the embodiments of the present application comprises the battery device according to any one of the above embodiments.

[0070] Since the power consuming device comprises the above-described battery device, at least all the advantages of the above-described battery device are included, which will not be described herein again.

[0071] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0072] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0073] FIG. 1 is a structural schematic view of a power consuming device according to some embodiments of the present application;

[0074] FIG. 2 is a first structural schematic view of a battery device according to some embodiments of the present application;

[0075] FIG. 3 is a second structural schematic view of a battery device according to some embodiments of the present application;

[0076] FIG. 4 is a third structural schematic view of a battery device according to some embodiments of the present application;

[0077] Fig. 5 is a partial enlarged view of the battery device of Fig. 2;

[0078] Fig. 6 is a fourth structural schematic view of a battery device according to some embodiments of the present application;

[0079] Fig. 7 is a partial enlarged view of the battery device of Fig. 6;

[0080] Fig. 8 is a fifth structural schematic view of a battery device according to some embodiments of the present application;

[0081] Fig. 9 is a structural schematic view of a first expansion beam according to some embodiments of the present application;

[0082] Fig. 10 is an exploded schematic view of the first expansion beam of Fig. 9.

[0083] Legend: electrical device 1A; battery device 1000; controller 2000; motor 3000; first expansion beam 100; box 200; side wall 201 of the box; bottom wall 202 of the box; battery cell 300; thermal management assembly 400; reinforcing beam 500; mounting beam 600; notch 610; avoiding passage 203; heat exchange pipe 410; inlet portion 411; outlet portion 412; current collector 420; first reinforcing portion 510; second reinforcing portion 520; first beam 620; second beam 630; third beam 640; mounting groove 204; first plate 10; second plate 20; first flange 11; second flange 12; third flange 211; fourth flange 221; main plate 21; support plate 22; first folded edge 212; second folded edge 222; first fixing hole 2121; connecting portion 2123; recessed portion 2122; first lug 2221; avoiding portion 2222; first avoiding recess 223; second avoiding recess 530; reinforcing plate 30; flat plate portion 31; bent portion 32; third folded edge 33; second lug 331; first connecting plate 1001; first connecting hole 13; second connecting plate 1002; second connecting hole 213; bracket 650; support plate 651; leg 652; support section 6520; extension section 6521; second expansion beam 700; adhesive layer 800. DETAILED DESCRIPTION

[0084] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals are used throughout the figures to refer to the same or like elements or elements having the same or similar function. The embodiments described below are exemplary and are merely intended to explain the present application, and are not to be understood as limiting the present application.

[0085] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0086] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0087] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0088] The disclosure that follows provides many different embodiments, or examples, for implementing different structures of the application. For the purpose of simplicity, the elements and settings of the particular examples below are described in some instances by reference to only a few of the many different embodiments of the application. In no way should the application be construed as being limited by the examples that follow. In addition, the application can be implemented in a variety of different ways and the examples below are merely provided for the purpose of clarity and explanation. Also, the application provides examples of various specific components, materials, and acts which are implemented in a particular manner. However, a person of ordinary skill in the art would recognize that other components, materials, and acts can be used in place of, or in conjunction with, the ones described below.

[0089] At present, from the development of market situation, the application of battery is more and more extensive. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0090] The battery monomer may change in volume during the charging and discharging process, especially after high temperature or long time use, the expansion phenomenon is particularly obvious. In order to deal with the expansion of battery monomer, the concept of expansion beam is introduced in the related technology. The expansion beam is designed to maintain a certain distance from the battery monomer, located on one side of the battery monomer, and connected with the side wall of the box body, so as to bear and control the pressure generated by the expansion of the battery monomer, prevent the deformation or damage of the box body.

[0091] However, the expansion beam may not be able to effectively disperse and absorb the force generated by the expansion of the battery monomer due to the limitation of the elastic modulus of the material, the geometric shape or the connection mode, which may cause the deformation of the expansion beam itself, even the failure of function, so the overall anti-expansion ability of the battery monomer of the expansion beam is low. And with the layout adjustment of the internal structure of the battery device, the expansion beam is often difficult to be directly arranged on the bottom wall, which makes the overall anti-expansion ability of the battery monomer of the expansion beam face serious challenges. For example, in order to make the battery monomer run under suitable temperature conditions, a thermal management component is arranged in the box body of the battery device, which needs to be connected with the external structure to supplement the cooling liquid. In order to avoid the thermal management component, the structural stability of the expansion beam will also be affected.

[0092] In order to solve the above technical problem, i.e. how to improve the overall resistance of the expansion beam to the expansion force of the battery cell, the application provides an improved battery device design. In the battery device of the application, a mounting beam is arranged between the bottom wall and the expansion beam to improve the stability of the expansion beam. The mounting beam is provided with a notch, and the first expansion beam, the mounting beam and the bottom wall of the box body jointly form an avoidance channel in communication with the notch, which can be used to avoid the inlet and outlet of the thermal management assembly. The walls on both sides of the notch of the mounting beam are connected by a reinforcing beam to improve the stability of the mounting beam, thereby further improving the structural stability of the expansion beam. In this way, the expansion force of the battery cell on the first expansion beam is dispersed, avoiding the local overloading of the first expansion beam, so that the force distribution is more uniform, thereby improving the ability of the first expansion beam to resist the expansion force of the battery cell.

[0093] Please refer to FIG. 1, which is a structural schematic diagram of a power consuming device 1A provided by some embodiments of the application. The power consuming device 1A can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, spacecraft, etc.

[0094] The following embodiments are described by taking a power consuming device 1A of the application as an example of a vehicle for convenience of description.

[0095] 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 source of the vehicle.

[0096] The vehicle can also include a controller 2000 and a motor 3000, and the controller 2000 is used to control the battery device 1000 to supply power to the motor 3000, for example, for the power demand of the vehicle during starting, navigation and driving.

[0097] In the application, the battery device 1000 can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0098] Please refer to FIG. 2, which is a first structural schematic diagram of a battery device 1000 provided by some embodiments of the application. The battery device 1000 includes a battery cell 300 and a box body 200, and the box body 200 is used to accommodate the battery cell 300. The power consuming device 1A of the application uses the battery device 1000 or the battery cell 300 as the power source.

[0099] In the embodiments of the present application, the battery cell 300 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 in the embodiments of the present application. The battery cell 300 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc., which are not limited in the embodiments of the present application. The battery cell 300 is generally divided into three types according to the packaging manner: a cylindrical battery cell 300, a square battery cell 300, and a soft-pack battery cell 300, which are not limited in the embodiments of the present application.

[0100] The battery device 1000 mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 300 to provide higher voltage and capacity. For example, the battery device 1000 mentioned in the embodiments of the present application can include a battery module or a battery pack, etc. The battery device 1000 generally includes a box 200 for packaging one or more battery cells 300. The box 200 can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery cell 300.

[0101] Among them, the box 200 is a component for accommodating the battery cell 300, and the box 200 provides an accommodation space for the battery cell 300. The box 200 can adopt various structures. In some embodiments, the box 200 can include a first box and a second box, and the first box and the second box are covered with each other to define an accommodation space for accommodating the battery cell 300. The first box and the second box can be various shapes, such as a cuboid, a cylinder, etc. The first box can be a hollow structure with one side open, and the second box can also be a hollow structure with one side open. The open side of the second box is covered on the open side of the first box, and then the box 200 with the accommodation space is formed. The first box can be a hollow structure with one side open, and the second box can be a plate structure. The second box is covered on the open side of the first box, and then the box 200 with the accommodation space is formed. The first box and the second box can be sealed by a sealing element, which can be a sealing ring, sealing glue, etc.

[0102] In the battery device 1000, when the battery cell 300 is multiple, the multiple battery cells 300 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery cells 300 are connected in series and in parallel. The multiple battery cells 300 can be connected in series or in parallel or in a mixed manner to form a battery module, and the multiple battery modules are connected in series or in parallel or in a mixed manner to form a whole, which is accommodated in the box 200. Alternatively, all the battery cells 300 can be directly connected in series or in parallel or in a mixed manner, and then the whole formed by the battery cells 300 is accommodated in the box 200.

[0103] In some embodiments, the battery device 1000 can further include a busbar component, through which the plurality of battery monomers 300 can be electrically connected to achieve series connection, parallel connection or mixed connection of the plurality of battery monomers 300. The busbar component can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0104] In some embodiments, the battery device 1000 can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0105] Please refer to FIG. 2, FIG. 3 and FIG. 4, FIG. 3 is a second structural schematic diagram of the battery device 1000 provided by some embodiments of the present application, and FIG. 4 is a third structural schematic diagram of the battery device 1000 provided by some embodiments of the present application. The battery device 1000 of the present embodiment includes a first expansion beam 100, a box body 200, a battery monomer 300, a thermal management assembly 400, a reinforcing beam 500 and a mounting beam 600. The battery monomer 300 is arranged in the box body 200; the mounting beam 600 is mounted to the box body 200 and is provided with a notch 610; the first expansion beam 100 is mounted to the box body 200 through the mounting beam 600 and cooperates with the battery monomer 300, the first expansion beam 100, the mounting beam 600 and the bottom wall 202 of the box body 200 jointly form an avoiding passage 203 which is in communication with the notch 610; the thermal management assembly 400 is arranged in the box body 200 and exchanges heat with the battery monomer 300, the thermal management assembly 400 includes an inlet portion 411 and an outlet portion 412; at least one of the inlet portion 411 and the outlet portion 412 is provided in the avoiding passage 203.

[0106] In some embodiments, the battery device 1000 can further include a busbar component, through which the plurality of battery monomers 300 can be electrically connected to achieve series connection, parallel connection or mixed connection of the plurality of battery monomers 300. The busbar component can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0107] For the convenience of description, the length direction of the first expansion beam 100 (the width direction of the box body 200) is set as the first direction X, the thickness direction of the first expansion beam 100 (the length direction of the box body 200) is set as the second direction Y, and the height direction of the first expansion beam 100 (the height direction of the box body 200) is set as the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. In a specific example, 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.

[0108] Specifically, the first expansion beam 100 can be a structural member for bearing and controlling the expansion force of the battery monomer 300. Along the third direction Z, the first expansion beam 100 can be spaced apart from the bottom wall 202 of the box body 200 and is arranged in suspension relative to the bottom wall 202. Along the first direction X, the two ends of the first expansion beam 100 can be connected to the side wall 201 of the box body 200.

[0109] The first expansion beam 100 can abut against the side surface of the plurality of battery cells 300 to bear the expansion force collectively applied by the plurality of battery cells 300. The first expansion beam 100 can be made of a material such as a high-strength alloy, a carbon fiber composite material, or an engineering plastic, and the specific shape thereof can be set as needed.

[0110] In one embodiment, the first expansion beam 100 can be frame-shaped. The frame-shaped first expansion beam 100 can include a plurality of cross beams and longitudinal beams that collectively form a plurality of grid or frame structures. When subjected to the expansion force from the battery cells 300, the plurality of grid or frame structures can more evenly disperse the expansion force, reducing local stress concentration, thereby improving the overall ability of the first expansion beam 100 to resist expansion of the battery cells 300.

[0111] The mounting beam 600 is a structural member connecting the bottom wall 202 of the case 200 and the first expansion beam 100, and can be used to support the first expansion beam 100 and transfer the expansion force borne by the first expansion beam 100, thereby enhancing the ability of the first expansion beam 100 to resist expansion of the battery cells 300. The notch 610 can pass through the mounting beam 600 in the thickness direction of the mounting beam 600. The mounting beam 600 can be a symmetrical structure, and the notch 610 can be located on both sides of the symmetry line of the mounting beam 600, or can be located at other positions of the mounting beam 600.

[0112] In the third direction Z, the mounting beam 600 can include opposite two ends, one end of which can be connected with the first expansion beam 100, and the other end of which can be connected with the bottom wall 202. The connection between the mounting beam 600 and the first expansion beam 100, and the connection between the mounting beam 600 and the bottom wall 202 can be non-detachable connection such as welding or riveting, or can be detachable connection such as threaded connection or pin connection. For example, one end of the mounting beam 600 can be connected with the first expansion beam 100 in a threaded connection manner, and the other end of the mounting beam 600 can be connected with the first expansion beam 100 in a threaded connection manner.

[0113] The first expansion beam 100 and the mounting beam 600 can be connected only by fasteners, the first expansion beam 100 and the mounting beam 600 can also be connected only by the adhesive layer 800, and the first expansion beam 100 and the mounting beam 600 can also be connected by both fasteners and the adhesive layer 800.

[0114] The first expansion beam 100 can be directly connected with the mounting beam 600 through the adhesive layer 800. The adhesive layer 800 can be structural adhesive. Similarly, the first expansion beam 100 can be directly connected with the mounting beam 600 through fasteners, or indirectly connected with the mounting beam 600 through fasteners. The fasteners connected between the first expansion beam 100 and the mounting beam 600 include but are not limited to bolts, studs, rivet nuts, etc.

[0115] The heat management assembly 400 is arranged in the box 200. For example, the heat management assembly 400 is arranged on the bottom wall 202 of the box 200. The heat management assembly 400 can be placed on the bottom wall 202, or fixed to the bottom wall 202 through fasteners. The heat management assembly 400 can include one or more heat exchange pipes 410. The heat exchange pipes 410 can be flat tubes. The heat management assembly 400 can be used for heat exchange with the battery monomer 300, so that the battery monomer 300 can operate in a suitable temperature range. When the battery device 1000 is working, an external heat exchange fluid can enter the heat exchange pipe 410 from the inlet portion 411, and then flow out from the outlet portion 412 after completing heat exchange with the battery monomer 300.

[0116] At least one of the inlet portion 411 and the outlet portion 412 is arranged in the avoiding channel 203. That is, only the inlet portion 411 can be arranged in the avoiding channel 203, or only the outlet portion 412 can be arranged in the avoiding channel 203, or both the inlet portion 411 and the outlet portion 412 can be arranged in the avoiding channel 203, so as to facilitate the connection between the inlet portion 411 and the outlet portion 412 of the heat management assembly 400 and external pipelines. In addition, the number of avoiding channels 203 can be one or more. Therefore, the inlet portion 411 and the outlet portion 412 can be arranged in the same avoiding channel 203, or the inlet portion 411 and the outlet portion 412 can be arranged in different avoiding channels 203, respectively.

[0117] The heat management assembly 400 can further include a current collector 420. The current collector 420 and the heat exchange pipe 410 can be arranged on two sides of the first expansion beam 100 in the second direction Y. In order to realize the connection between the inlet portion 411 and the outlet portion 412 of the heat exchange pipe 410 and the current collector 420, the first expansion beam 100 is arranged on the mounting beam 600 in the present embodiment. In this way, the mounting beam 600 can lift the first expansion beam 100, so that the first expansion beam 100 is spaced apart from the bottom wall 202 of the box 200. Meanwhile, the mounting beam 600 and the bottom wall 202 of the box 200 define the avoiding channel 203 therebetween. The avoiding channel 203 communicates the spaces on two sides of the mounting beam 600 in the second direction Y. The inlet portion 411 and the outlet portion 412 of the heat exchange pipe 410 can pass through the avoiding channel 203 from one side of the mounting beam 600, and extend to the other side of the mounting beam 600, so as to be connected with the current collector 420 located on the other side of the mounting beam 600.

[0118] The shape of the reinforcing beam 500 can be linear, curved, or have a specific structure, such as a corrugated or ribbed design. The material can be a high-strength metal or a composite material to meet the requirements of structural strength and lightweight.

[0119] The connection between the reinforcing beam 500 and the first expansion beam 100, and between the reinforcing beam 500 and the mounting beam 600 can be non-detachable connection such as welding or riveting, or detachable connection such as threaded connection or pin connection.

[0120] When the battery cell 300 expands, the force can be directly transmitted to the mounting beam 600 through the first expansion beam 100, or directly transmitted to the wall on both sides of the mounting beam 600 gap 610 through the reinforcing beam 500, or transmitted between the walls on both sides of the mounting beam 600 gap 610 through the reinforcing beam 500, and further transmitted to the bottom wall 202 of the box 200 through the mounting beam 600. This optimizes the distribution of force, avoids local stress concentration, and improves the ability of the first expansion beam 100 to resist the expansion force of the battery cell 300.

[0121] In the battery device 1000 of the embodiments of the present application, the reinforcing beam 500, the mounting beam 600, and the first expansion beam 100 can form a continuous structure, and the reinforcing beam 500 can cooperate with the mounting beam 600 to support the first expansion beam 100, so that the stability of the first expansion beam 100 is higher. This can effectively disperse the expansion force of the battery cell 300 on the first expansion beam 100, avoid local overloading of the first expansion beam 100, make the distribution of force more uniform, and thus improve the ability of the first expansion beam 100 to resist the expansion force of the battery cell 300.

[0122] In addition, the avoidance channel 203 can provide space for the inlet part 411 or the outlet part 412 of the thermal management assembly 400, thereby improving the overall space utilization of the battery device 1000.

[0123] In some embodiments, the reinforcing beam 500 is transversely arranged in the gap 610 and connected to the walls on both sides of the gap 610 formed by the mounting beam 600.

[0124] Specifically, along the first direction X, the reinforcing beam 500 can include two opposite end faces. On both sides of the gap 610, the mounting beam 600 can include two end faces facing opposite directions. The two end faces of the reinforcing beam 500 can be butt-jointed with the two end faces of the mounting beam 600.

[0125] In this way, the reinforcing beam 500 occupies less space, which is conducive to improving the space utilization of the battery device 1000.

[0126] Referring to FIG. 3, in some embodiments, the reinforcing beam 500 covers the gap 610 and is connected to the walls adjacent to both sides of the mounting beam 600 near the gap 610.

[0127] Specifically, the reinforcing beam 500 can include opposite two ends along the first direction X. The opposite two ends of the reinforcing beam 500 can be sleeved on the walls adjacent to both sides of the mounting beam 600 near the gap 610.

[0128] In this way, the connection area between the reinforcing beam 500 and the mounting beam 600 is large, which can improve the stability of the reinforcing beam 500 itself, so that the reinforcing beam 500 can stably support the first expansion beam 100, thereby improving the ability of the first expansion beam 100 to resist the expansion force of the battery cell 300.

[0129] Referring to FIG. 3 and FIG. 5, FIG. 5 is an enlarged view of part a of the battery device 1000 of FIG. 2. In some embodiments, the reinforcing beam 500 includes a first reinforcing portion 510 and a second reinforcing portion 520 connected at an included angle, the first reinforcing portion 510 is connected to the mounting beam 600, and the second reinforcing portion 520 is connected to the first expansion beam 100.

[0130] Specifically, the included angle between the first reinforcing portion 510 and the second reinforcing portion 520 can be an acute angle, a right angle, or an obtuse angle. The first reinforcing portion 510 can extend along a third direction Z. The second reinforcing portion 520 can extend along a second direction Y. The connection mode between the first reinforcing portion 510 and the mounting beam 600 can be the same as or different from the connection mode between the second reinforcing portion 520 and the first expansion beam 100. For example, the connection mode between the first reinforcing portion 510 and the mounting beam 600 and the connection mode between the second reinforcing portion 520 and the first expansion beam 100 can both be threaded connection.

[0131] In this way, due to the included angle of the first reinforcing portion 510 and the second reinforcing portion 520, the reinforcing beam 500 can provide additional support when connected to the mounting beam 600 and the first expansion beam 100, increase the rigidity of the overall structure of the reinforcing beam 500, the mounting beam 600 and the first expansion beam 100, and help to improve the stability and torsional capacity of the overall structure, thereby improving the ability of the first expansion beam 100 to resist the expansion force of the battery cell 300.

[0132] In addition, the first reinforcing portion 510 and the second reinforcing portion 520 connected at an included angle make the reinforcing beam 500 have a large mounting space, which facilitates the connection between the reinforcing beam 500 and the mounting beam 600 and the first expansion beam 100.

[0133] Please refer to FIG. 3, FIG. 6 and FIG. 7, FIG. 6 is a fourth structural schematic diagram of the battery device 1000 provided by some embodiments of the present application, and FIG. 7 is an enlarged view of part b of the battery device 1000 in FIG. 6. In some embodiments, the mounting beam 600 comprises a first beam 620, a second beam 630 and a third beam 640 connected in sequence at an angle, the first beam 620 and the third beam 640 are both connected with the bottom wall 202 of the box body 200, and the first beam 620 is closer to the battery monomer 300 than the third beam 640; the first reinforcing part 510 is connected with the third beam 640, and the second reinforcing part 520 is connected with the second beam 630.

[0134] Specifically, the first beam 620 and the third beam 640 can be connected on both sides of the second beam 630 respectively. The angle between the first beam 620 and the second beam 630 can be an acute angle, a right angle or an obtuse angle. The angle between the third beam 640 and the second beam 630 can be the same as or different from the angle between the first beam 620 and the second beam 630. For example, the angle between the third beam 640 and the second beam 630 and the angle between the first beam 620 and the second beam 630 are both right angles.

[0135] Among them, the first beam 620 can include two segments with angles, one of which can be connected with the bottom wall 202, and the other of which can be connected with the second beam 630. The angle between the first beam 620 and the second beam 630 refers to the angle between the segment of the first beam 620 connected with the second beam 630 and the second beam 630. The third beam 640 can include two segments with angles, one of which can be connected with the bottom wall 202, and the other of which can be connected with the second beam 630. The angle between the third beam 640 and the second beam 630 refers to the angle between the segment of the third beam 640 connected with the second beam 630 and the second beam 630.

[0136] In this way, due to the angle setting of the first beam 620, the second beam 630 and the third beam 640, a frame structure can be formed between the mounting beam 600 and the bottom wall 202 of the box body 200, which can increase the structural strength of the mounting beam 600, thereby improving the stability between the mounting beam 600 and the first expansion beam 100 and the reinforcing beam 500, and further improving the ability of the first expansion beam 100 to resist the expansion force of the battery monomer 300.

[0137] In addition, the first beam 620, the second beam 630 and the third beam 640 connected at an angle make the mounting beam 600 have a larger mounting space, which facilitates the connection between the mounting beam 600 and the reinforcing beam 500 and the first expansion beam 100.

[0138] Please refer to FIG. 6 and FIG. 7. In some embodiments, the number of the notch 610 is one or more; when the number of the notch 610 is more than one, the number of the mounting beam 600 is more than one, and the number of the mounting beam 600 corresponds to the number of the notch 610 one by one. For example, the number of the mounting beam 600 can be two, and the two mounting beams 600 are provided with two notches 610.

[0139] In this way, the plurality of mounting beams 600 can provide a plurality of support points, thereby dispersing the stress of the first expansion beam 100 to improve the ability of the first expansion beam 100 to resist the expansion force of the battery cell 300.

[0140] In some embodiments, when the number of the notch 610 is more than one, the number of the mounting beam 600 is one, and one mounting beam 600 is opposite to the plurality of notches 610. For example, along the first direction X, a plurality of mutually spaced positions of the mounting beam 600 are provided with three notches 610. Among them, the distance between two adjacent notches 610 of the three notches 610 can be equal or not equal.

[0141] In this way, the notch 610 can be formed on one mounting beam 600, which facilitates the manufacturing of the mounting beam 600 and is conducive to reducing the manufacturing cost.

[0142] Please refer to FIG. 6, FIG. 7 and FIG. 8, and FIG. 8 is a fifth structural schematic diagram of the battery device 1000 provided by some embodiments of the present application. In some embodiments, the heat management assembly 400 is formed by bending the heat exchange pipe 410, and the inlet portion 411 and the outlet portion 412 of the heat exchange pipe 410 are arranged adjacent to each other, so that the inlet portion 411 and the outlet portion 412 of the heat exchange pipe 410 are both provided in the notch 610.

[0143] Specifically, the inlet portion 411 and the outlet portion 412 of the heat exchange pipe 410 can be the inlet portion 411 and the outlet portion 412 of the heat management assembly 400. The inlet portion 411 and the outlet portion 412 of the heat exchange pipe 410 can be arranged side by side along the first direction X. Moreover, along the first direction X, the overall size of the inlet portion 411 and the outlet portion 412 can be smaller than the size of the notch 610.

[0144] In this way, the heat management assembly 400 is formed by bending the heat pipe, which can increase the contact area between the battery cell 300 and the heat management assembly 400, thereby improving the heat exchange effect between the heat management assembly 400 and the battery cell 300.

[0145] In addition, the notch 610 can provide a passage for the inlet portion 411 and the outlet portion 412, thereby facilitating the layout of the heat management assembly 400.

[0146] Please refer to FIG. 6, FIG. 7 and FIG. 8. In some embodiments, the number of heat exchange pipes 410 is multiple, the multiple inlets 411 and the multiple outlets 412 of the multiple heat exchange pipes 410 are arranged in a concentrated and adjacent manner, and are collectively provided in one notch 610. For example, the number of heat exchange pipes 410 is two. The two heat exchange pipes 410 can include two inlets 411 and two outlets 412. The positional relationship between the inlet 411 and the outlet 412 can be that the inlet 411, the outlet 412, the inlet 411 and the outlet 412 are arranged in the first direction X, or the inlet 411, the inlet 411, the outlet 412 and the outlet 412 are arranged in the first direction X, or other combinations.

[0147] In this way, the heat exchange pipe 410 occupies a smaller space, which is conducive to improving the space utilization of the battery device 1000.

[0148] In some embodiments, the number of heat exchange pipes 410 is multiple, and the number of notches 610 is also multiple. The inlet 411 and the outlet 412 of each heat exchange pipe 410 are provided in one notch 610. For example, the number of notches 610 is four, the number of heat exchange pipes 410 is two, and the two heat exchange pipes 410 can include two outlets 412 and two inlets 411. The two outlets 412 and the two inlets 411 can be independently provided in the four notches 610, respectively.

[0149] In this way, the inlet 411 and the outlet 412 of each heat exchange pipe 410 are independently arranged, which can reduce the interference between adjacent or nearby inlets 411 or outlets, and facilitate the maintenance of the inlet 411 and the outlet 412.

[0150] Please refer to FIG. 6, FIG. 7 and FIG. 8. In some embodiments, the heat exchange pipe 410 gradually extends and bends from the outer periphery of the battery device 1000 to the middle position of the battery device 1000. In this way, the contact area between the heat exchange pipe 410 and the battery monomer 300 is larger, which can improve the heat exchange effect between the heat exchange pipe 410 and the battery monomer 300.

[0151] Please refer to FIG. 6, FIG. 7 and FIG. 8. In some embodiments, the number of heat exchange pipes 410 is multiple, and is arranged in parallel. For example, the number of heat exchange pipes 410 is two, one of which includes one inlet 411 and one outlet 412, and the other of which also includes one inlet 411 and one outlet 412.

[0152] In this way, the multiple heat exchange pipes 410 are less likely to interfere with each other.

[0153] Referring to FIGS. 6 and 7, in some embodiments, the bottom wall 202 is provided with a mounting groove 204, and the heat exchange pipe 410 is arranged in the mounting groove 204 and extends along the extension direction of the mounting groove 204.

[0154] In some embodiments, the mounting groove 204 can be a blind groove provided on the bottom wall 202. In the width direction of the mounting groove 204, the size of the heat exchange pipe 410 can be smaller than the width of the mounting groove 204. The heat exchange pipe 410 can be arranged in the mounting groove 204 by clamping and can be fixed by structural glue.

[0155] In this way, the arrangement of the mounting groove 204 can facilitate the arrangement of the heat exchange pipe 410, reduce the space occupied by the heat exchange pipe 410 in the inside of the box body 200, compact the structure, and improve the energy density of the battery device 1000.

[0156] Referring to FIG. 9, FIG. 9 is a structural schematic diagram of the first expansion beam 100 according to some embodiments of the present application. In some embodiments, the first expansion beam 100 includes a plurality of plate bodies, and the plurality of plate bodies are sheet metal parts. The plurality of plate bodies are connected by welding to form the first expansion beam 100.

[0157] Specifically, the first expansion beam 100 can include two, three, four, five, six or more plate bodies. The plate body is a sheet metal part, i.e., the plate body is a metal plate. For example, the plate body can be a steel plate. Further, the plate body can be a steel plate with a yield strength greater than or equal to 340 MPa and a tensile strength greater than or equal to 590 MPa.

[0158] In the manufacturing of the first expansion beam 100, the plurality of plate bodies of the first expansion beam 100 can be first processed from a sheet metal base material, then the plurality of plate bodies are connected by welding, and finally the first expansion beam 100 after welding is placed in an electrophoresis tank for electrophoresis to improve the service life of the first expansion beam 100.

[0159] In this way, since the plurality of plate bodies are connected by welding to form an integrated first expansion beam 100, the structure of the first expansion beam 100 can be simplified, the first expansion beam 100 can be conveniently processed and formed, and the cost can be reduced. At the same time, since the plate body is a sheet metal part, the structural strength of the plate body can be improved, and the structural strength of the first expansion beam 100 can be improved.

[0160] Referring to FIG. 10, FIG. 10 is an exploded schematic diagram of the first expansion beam 100 of FIG. 9. In some embodiments, the first expansion beam 100 includes a plurality of plate bodies connected and arranged, and the plurality of plate bodies respectively include a first plate 10 and a second plate 20. The first plate 10 and the second plate 20 extend along a first direction X and are arranged along a second direction Y. In a third direction Z, the two ends of the first plate 10 are respectively connected to the two ends of the second plate 20, and cooperate to define a cavity of the first expansion beam 100. The first direction X, the second direction Y and the third direction Z intersect with each other.

[0161] Specifically, the first plate 10 and the second plate 20 can be plates extending along the length direction and the height direction of the first expansion beam 100, the first plate 10 and the second plate 20 can be arranged in the thickness direction of the first expansion beam 100, and the two ends of the first plate 10 in the height direction of the first expansion beam 100 can be connected to the two ends of the second plate 20 in the height direction of the first expansion beam 100, respectively, and form the first expansion beam 100 with a cavity, i.e., the first expansion beam 100 can be a hollow beam. In this way, compared with an expansion beam formed by extrusion, the first expansion beam 100 of the present embodiment has a simpler structure, is more convenient to process, and has a low cost.

[0162] It should be noted that the third direction Z intersects with the first direction X and the second direction Y two by two, 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 included 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 included 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 included angle of 30°, 60°, 90°, 120°, or 150°.

[0163] In this way, since the plurality of plate bodies include the first plate 10 and the second plate 20, and the first plate 10 and the second plate 20 are connected and define the cavity of the first expansion beam 100, the composition structure of the first expansion beam 100 can be simplified, the processing is facilitated, and the cost is reduced.

[0164] Please refer to FIG. 10. In some embodiments, in the third direction Z, the two ends of the first plate 10 have a first flange 11 and a second flange 12 extending towards the second plate 20, the two ends of the second plate 20 have a third flange 211 and a fourth flange 221 extending towards the first plate 10, the first flange 11 is connected to the third flange 211 by lapping, and the second flange 12 is connected to the fourth flange 221 by lapping.

[0165] Specifically, the first plate 10 is formed with a first flange 11 and a second flange 12 at two ends thereof in the height direction of the first expansion beam 100, both of which can extend toward the second plate 20 in the thickness direction of the first expansion beam 100, wherein the first flange 11 and the second flange 12 can be formed by bending the two ends of the first plate 10 toward the second plate 20. At this time, the cross section of the first plate 10 perpendicular to the length direction is U-shaped with an opening toward the second plate 20.

[0166] The second plate 20 can be formed with a third flange 211 and a fourth flange 221 at two ends thereof in the height direction of the first expansion beam 100, both of which can extend toward the first plate 10 in the thickness direction of the first expansion beam 100, wherein the third flange 211 and the fourth flange 221 can be formed by bending the two ends of the second plate 20 toward the first plate 10. At this time, the cross section of the second plate 20 perpendicular to the length direction is U-shaped with an opening toward the first plate 10.

[0167] When the first plate 10 and the second plate 20 are assembled, the first flange 11 and the third flange 211 can be stacked and welded in the height direction of the first expansion beam 100, and the second flange 12 and the fourth flange 221 can be stacked and welded in the height direction of the first expansion beam 100. In this way, the first plate 10 and the second plate 20 can be conveniently welded and connected, and the first expansion beam 100 can be conveniently formed into a beam with a cavity. In addition, the first flange 11 and the third flange 211 are lap welded, and the second flange 12 and the fourth flange 221 are lap welded, which can also improve the connection strength between the first plate 10 and the second plate 20 and enhance the overall strength of the first expansion beam 100.

[0168] In this way, since the first flange 11 and the second flange 12 of the first plate 10 are connected to the third flange 211 and the fourth flange 221 of the second plate 20 respectively, the structure is simple, the first plate 10 and the second plate 20 can be conveniently welded and connected, the structural strength of the welding position can be improved, and the structural strength of the first expansion beam 100 can be improved.

[0169] Please refer to FIG. 10. In some embodiments, the second plate 20 includes a main plate 21 and a support plate 22 arranged separately, the main plate 21 is arranged on the side of the support plate 22 away from the bottom wall 202 in the third direction Z, the main plate 21 is provided with a first flange 212 extending away from the second plate 20 in the second direction Y, the support plate 22 is provided with a second flange 222 extending away from the second plate 20 in the second direction Y, and the first flange 212 and the second flange 222 are arranged in layers and connected.

[0170] Specifically, the main plate 21 and the support plate 22 can be arranged in the height direction of the first expansion beam 100, and the main plate 21 can be a plate-shaped structure extending in the length direction and the height direction of the first expansion beam 100. The support plate 22 can be connected to one side of the main plate 21 facing the heat exchange tube 410. The main plate 21 and the support plate 22 can be independent components, and the main plate 21 and the support plate 22 can be connected by welding. The separate arrangement of the main plate 21 and the support plate 22 can reduce the processing difficulty of the second plate 20 and improve the production efficiency.

[0171] The side edge of the main plate 21 facing the support plate 22 can be provided with a first folded edge 212. The side edge of the main plate 21 away from the support plate 22 can be provided with a third folded edge 211. The side edge of the support plate 22 facing the main plate 21 can be provided with a second folded edge 222. The side edge of the support plate 22 away from the main plate 21 can be formed with a fourth folded edge 221.

[0172] The first folded edge 212 and the second folded edge 222 can be connected by lapping. For example, the first folded edge 212 and the second folded edge 222 are arranged in the height direction of the first expansion beam 100 and are connected by welding. In this way, not only the connection reliability between the main plate 21 and the support plate 22 can be improved, but also the structural strength of the second plate 20 can be improved, thereby improving the structural strength of the first expansion beam 100.

[0173] The first folded edge 212 and the second folded edge 222 can extend away from the cavity in the thickness direction of the first expansion beam 100. In this way, the first folded edge 212 and the second folded edge 222 can be located outside the cavity, facilitating the welding operation of the first folded edge 212 and the second folded edge 222.

[0174] In this way, by providing the second plate 20 with the separately arranged main plate 21 and support plate 22, the production difficulty of the second plate 20 can be reduced, and the processing efficiency can be improved. At the same time, by connecting the main plate 21 and the support plate 22 by lapping and welding through the first folded edge 212 and the second folded edge 222 respectively, the structural strength of the second plate 20 can be improved, and the main plate 21 and the support plate 22 can be conveniently connected by welding.

[0175] Please refer to FIG. 5, FIG. 8 and FIG. 10. In some embodiments, the first folded edge 212 is formed with a plurality of first fixing holes 2121 penetrating through the first folded edge 212 in the third direction Z, and the plurality of first fixing holes 2121 are arranged at intervals in the first direction X. The first expansion beam 100 is connected to the mounting beam 600 by fasteners penetrating through a part of the first fixing holes 2121, and the first expansion beam 100 is connected to the reinforcing beam 500 by fasteners penetrating through another part of the first fixing holes 2121.

[0176] Specifically, the first folded edge 212 can extend along the length direction and the thickness direction of the first expansion beam 100, and a plurality of first fixing holes 2121 can be arranged on the first folded edge 212. For example, the first folded edge 212 can be provided with two, four, six, eight, ten, twelve, fourteen or more first fixing holes 2121. The plurality of first fixing holes 2121 can be arranged at intervals along the length direction of the first expansion beam 100. In assembly, the first expansion beam 100 which is welded into one and electrophoresed is placed in the box body 200. Then, a plurality of fasteners are respectively passed through the corresponding first fixing holes 2121 to connect the first expansion beam 100 with the mounting beam 600 and the reinforcing beam 500.

[0177] The fastener can be a bolt or a pull rivet nut, etc. The first fixing hole 2121 can be a circular hole or other polygonal hole.

[0178] In this way, the first folded edge 212 is provided with a plurality of first fixing holes 2121 for fastening connection with the mounting beam 600, so that the first expansion beam 100 can be conveniently connected with the mounting beam 600 and the reinforcing beam 500 through fasteners, and the plurality of first fixing holes 2121 can improve the reliability and uniformity of stress of the connection between the first expansion beam 100 and the mounting beam 600 and the reinforcing beam 500.

[0179] Please refer to FIG. 10, in some embodiments, the first folded edge 212 includes a plurality of connecting portions 2123 and a plurality of recessed portions 2122, the plurality of recessed portions 2122 and the plurality of connecting portions 2123 are alternately arranged and connected along the first direction X, the recessed portion 2122 is recessed and formed by the first folded edge 212 towards the support plate 22, and each recessed portion 2122 is formed with at least one first fixing hole 2121.

[0180] The second folded edge 222 includes a plurality of first lugs 2221 extending away from the first plate 10 along the second direction Y, the plurality of first lugs 2221 are arranged at intervals along the first direction X, and an avoiding portion 2222 is defined between adjacent two first lugs 2221,

[0181] The recessed portion 2122 is located in the avoiding portion 2222, and the plurality of connecting portions 2123 and the plurality of first lugs 2221 correspond one by one and are connected.

[0182] Specifically, the plurality of recesses 2122 and the plurality of connecting portions 2123 can be arranged alternately in the length direction of the first folded edge 212. Both ends in the length direction of the first folded edge 212 can be the connecting portions 2123. The recesses 2122 can be recessed in the direction of the support plate 22 relative to the connecting portions 2123. For example, the recesses 2122 can be punched in the direction of the support plate 22 on the first folded edge 212. Adjacent two recesses 2122 can cooperate with the connecting portions 2123 to define a recessed groove opening toward the second folded edge 222. The recessed groove can pass through both side edges of the first folded edge 212 in the width direction of the first folded edge 212.

[0183] Meanwhile, the first fixing hole 2121 can pass through the recess 2122 in the thickness direction of the first folded edge 212. At least one first fixing hole 2121 can be formed on each recess 2122. For example, one first fixing hole 2121 can be formed on part of the plurality of recesses 2122, and two or three first fixing holes 2121 can be formed on another part of the plurality of recesses 2122.

[0184] The second folded edge 222 can be formed with a plurality of first lugs 2221 arranged at intervals. The plurality of first lugs 2221 can be rectangular plates extending in the length direction and the width direction of the second folded edge 222. The plurality of first lugs 2221 can be located in the recessed groove. An avoiding portion 2222 can be defined between adjacent two first lugs 2221. The plurality of recesses 2122 and the plurality of avoiding portions 2222 can be arranged one-to-one, and the plurality of recesses 2122 can extend into the corresponding avoiding portions 2222. The avoiding portion 2222 can be a through groove provided on the second folded edge 222.

[0185] When the first folded edge 212 is connected with the second folded edge 222, the first lug 2221 of the second folded edge 222 can cooperate with the recessed groove at the position of the corresponding connecting portion 2123, and can be welded with the corresponding connecting portion 2123. The recess 2122 can correspond to the avoiding portion 2222 one-to-one, and cooperate with the corresponding avoiding portion 2222, so that the avoiding portion 2222 is exposed at the position of the first fixing hole 2121, thereby facilitating the fastener passing through the avoiding portion 2222 and connected with the box body 200.

[0186] Therefore, since the plurality of recesses 2122 are formed on the first fold edge 212, the plurality of recesses 2122 can improve the structural strength of the first fold edge 212 and improve the reliability when the first fold edge 212 is connected to the box body 200. At the same time, since the recesses 2122 are located in the avoiding portions 2222, the first lugs 2221 can be flush with the lower side surfaces of the recesses 2122, or the recesses 2122 can protrude from the lower side surfaces of the first lugs 2221, so that the recesses 2122 can abut against the connected parts when connected to the mounting beam 600, thereby improving the reliability of the fastening connection.

[0187] Please refer to FIG. 5, FIG. 8 and FIG. 10, in some embodiments, the support plate 22 is formed with a first avoiding groove 223 recessed towards the main plate 21 on the side edge away from the main plate 21 in the third direction Z, and the reinforcing beam 500 is formed with a second avoiding groove 530, the first avoiding groove 223 and the second avoiding groove 530 are arranged in the second direction Y, and the first avoiding groove 223 and the second avoiding groove 530 are used to avoid the inlet portion 411 and the outlet portion 412.

[0188] Specifically, the first avoiding groove 223 can be formed at the middle position of the support portion. In the direction from the support plate 22 to the main plate 21, the width of the first avoiding groove 223 can gradually decrease. Thus, the machining and forming of the first avoiding groove 223 can be facilitated, and stress concentration can be reduced.

[0189] The second avoiding groove 530 can be formed at the middle position of the reinforcing beam 500. The shape of the second avoiding groove 530 can be the same as that of the first avoiding groove 223, thereby providing a positioning function during assembly.

[0190] Therefore, by providing the first avoiding groove 223 and the second avoiding groove 530 on the support plate 22 and the reinforcing beam 500 respectively to avoid the inlet portion 411 and the outlet portion 412 of the heat exchange tube 410, the mutual interference between the support plate 22 and the inlet portion 411 and the outlet portion 412 can be reduced, and the layout can be more compact and reasonable.

[0191] Please refer to FIG. 10, in some embodiments, the plurality of plates further include a reinforcing plate 30, the reinforcing plate 30 extends in the first direction X, and the reinforcing plate 30 is arranged between the first plate 10 and the second plate 20 and connected to the first plate 10 and the second plate 20.

[0192] Specifically, the number of the reinforcing plate 30 can be one or more. The reinforcing plate 30 can be a flat plate connected between the first plate 10 and the second plate 20, or a bent plate, which is not limited in the present embodiment.

[0193] Thus, since the reinforcing plate 30 is provided between the first plate 10 and the second plate 20, the reinforcing plate 30 can reinforce the overall structural strength of the first expansion beam 100, and improve the anti-expansion effect on the battery cell 300.

[0194] Referring to FIG. 10, in some embodiments, the reinforcing plate 30 includes a flat plate portion 31 and a bent portion 32. The flat plate portion 31 is attached to and connected with the surface of the first plate 10, and the bent portion 32 is connected with the flat plate portion 31 and formed in a U-shaped structure extending in the first direction X and opening toward the first plate 10 in the second direction Y.

[0195] Specifically, the reinforcing plate 30 can include a plurality of flat plate portions 31 and at least one bent portion 32. The plurality of flat plate portions 31 can be arranged at intervals along the length direction or height direction of the first expansion beam 100. The surface of the flat plate portion 31 can be attached to the surface of the first plate 10 on the side facing the second plate 20. The bent portion 32 can be connected between two adjacent flat plate portions 31. The two ends of the bent portion 32 can be connected with the two flat plate portions 31, respectively, and the middle part of the bent portion 32 can protrude toward the second plate 20 and be welded to the second plate 20.

[0196] The bent portion 32 can include two side plates and a bottom plate. The bottom plate can be a flat plate extending in the length direction and the height direction of the first expansion beam 100, and the surface of the bottom plate can be attached to the surface of the second plate 20 facing the first plate 10. The two side plates can be connected with the two side edges of the width direction of the bottom plate, respectively, and extend toward the first plate 10 in the thickness direction of the first expansion beam 100 to be connected with the flat plate portion 31. The side plates and the bottom plate can be arranged perpendicularly, and the connection position of the side plates and the bottom plate can be connected with a circular arc to reduce stress concentration.

[0197] Thus, by making the reinforcing plate 30 include the flat plate portion 31 connected with the first plate 10 and the bent portion 32 protruding and bent toward the second plate 20, not only can the reinforcing plate 30 be conveniently welded to the first plate 10 and the second plate 20, but also the structural strength of the reinforcing plate 30 can be improved, and the overall strength of the first expansion beam 100 can be improved.

[0198] Referring to FIG. 10, in some embodiments, the number of bent portions 32 is a plurality, and the plurality of bent portions 32 are arranged at intervals in the third direction Z. The flat plate portion 31 is connected between two adjacent bent portions 32 and connected on both sides of the plurality of bent portions 32 in the third direction Z.

[0199] Specifically, the number of the bending portions 32 can be two, three, four, or more. In this way, the reinforcing plate 30 can be connected to the first plate 10 and the second plate 20 through the plurality of flat plate portions 31 and the plurality of bending portions 32 in the height direction of the first expansion beam 100. For example, the reinforcing plate 30 can include three flat plate portions 31 and two bending portions 32, the two bending portions 32 being arranged in an upper and lower interval and connected between two adjacent flat plate portions 31. This can improve the uniformity of the structural reinforcement of the reinforcing plate 30 to the first plate 10 and the second plate 20 in the height direction of the first expansion beam 100, thereby improving the overall structural strength of the first expansion beam 100.

[0200] A plurality of lightening holes can be formed on the bottom plate or the side plate of the bending portion 32. The plurality of lightening holes can be arranged in an interval along the length direction of the reinforcing plate 30. This can reduce the amount of material, reduce the weight of the reinforcing plate 30, reduce the weight of the first expansion beam 100, and improve the energy density of the battery device 1000.

[0201] In this way, by providing the plurality of bending portions 32 on the reinforcing plate 30, the structural strength of the reinforcing plate 30 can be further enhanced, the structural strength of the first expansion beam 100 can be enhanced, and the uniformity of the structural reinforcement of the reinforcing plate 30 to the first plate 10 and the second plate 20 in the height direction of the first expansion beam 100 can be improved, and the weak strength area of the first expansion beam 100 can be reduced.

[0202] Please refer to FIG. 10. In some embodiments, the reinforcing plate 30 further includes a third bent edge 33 connected to the flat plate portion 31, the third bent edge 33 having a plurality of second lugs 331 extending away from the first plate 10 along the second direction Y, the plurality of second lugs 331 being arranged in an interval along the first direction X, the plurality of second lugs 331 being clamped between the first bent edge 212 and the second bent edge 222 and being welded to the first bent edge 212 and the second bent edge 222.

[0203] Specifically, the third bent edge 33 can include a bent edge body and a plurality of second lugs 331. The flat plate portion 31 closest to the support plate 22 among the plurality of flat plate portions 31 is a first flat plate portion. The bent edge body can be connected to a side edge of the first flat plate portion close to the support plate 22, and the bent edge body can be in a long strip plate shape extending from one end to the other end along the length direction of the first expansion beam 100. The plurality of second lugs 331 can be connected to a side edge of the bent edge body away from the first flat plate portion, and extend in a rectangular plate shape along the thickness direction and the length direction of the first expansion beam 100. An avoidance hole for avoiding the recess 2122 on the first bent edge 212 can be defined between two adjacent second lugs 331.

[0204] When the first expansion beam 100 is welded, the connecting portion 2123 on the first flange 212, the second lug 331 on the third flange 33 and the first lug 2221 on the second flange 222 can be stacked in turn, and then the three layers of plates are welded together.

[0205] Thus, since the reinforcing plate 30 is further provided with the third flange 33 connected between the first flange 212 and the second flange 222, the third flange 33 can enhance the connection strength of the connection position of the first flange 212 and the second flange 222, improve the reliability of the fastening connection of the first flange 212 and the box body 200, and at the same time, the plurality of second lugs 331 arranged at intervals can define the avoiding hole of the avoiding portion 2122 of the first flange 212, reducing the probability of interference between the third flange 33 and the fastener passing through the first fixing hole 2121.

[0206] Please refer to FIG. 4, FIG. 8 and FIG. 10, in some embodiments, the battery device 1000 further comprises a first connecting plate 1001 and a second connecting plate 1002. The first connecting plate 1001 is fixed to the side wall 201 of the box body 200 by fasteners, and the first plate 10 is provided with a first connecting hole 13 penetrating the first plate 10 along the second direction Y at both ends of the first plate 10 in the first direction X, and the first plate 10 is fastened to the first connecting plate 1001 by fasteners passing through the first connecting hole 13. The second connecting plate 1002 is fixed to the side wall 201 of the box body 200 by fasteners, and the second plate 20 is provided with a second connecting hole 213 penetrating the second plate 20 along the second direction Y at both ends of the second plate 20 in the first direction X, and the second plate 20 is fastened to the second connecting plate 1002 by fasteners passing through the second connecting hole 213.

[0207] Specifically, the first connecting plate 1001 can be provided with a first hole and a second hole penetrating the first connecting plate 1001 along the thickness direction, and one end of the first connecting plate 1001 can be fixed to the side wall 201 of the box body 200 by fasteners passing through the first hole and the first fastening hole on the side wall of the box body 200. At the same time, the other end of the first connecting plate 1001 can be fixed to the first plate 10 by fasteners passing through the second hole and the first connecting hole 13 on the first plate 10. That is, on the side where the first plate 10 is located, both ends of the first expansion beam 100 in the length direction are fixed to the box body 200 by the first connecting plate 1001.

[0208] The second connecting plate 1002 can be provided with a third hole and a fourth hole penetrating through the second connecting plate 1002 in the thickness direction, and one end of the second connecting plate 1002 is fixed to the side wall 201 of the cabinet 200 through the third hole and the second fastening hole on the side wall of the cabinet 200 by means of a fastener. At the same time, the other end of the second connecting plate 1002 can be fixedly connected with the second plate 20 through the fourth hole and the second connecting hole 213 on the second plate 20 by means of a fastener. That is to say, on the side where the second plate 20 is located, the two ends of the first expansion beam 100 in the length direction are fixedly connected with the cabinet 200 through the second connecting plate 1002.

[0209] The number of the first connecting plates 1001 can be two. The two first connecting plates 1001 can respectively fix the two ends of the first plate 10 in the length direction on the two opposite side walls of the cabinet 200 in the first direction X. The number of the second connecting plates 1002 can be two. The two second connecting plates 1002 can respectively fix the two ends of the second plate 20 in the length direction on the two opposite side walls of the cabinet 200 in the first direction X.

[0210] In this way, the two sides of the first expansion beam 100 in the thickness direction are respectively fixed with the inner wall of the cabinet 200 through the first connecting plate 1001 and the second connecting plate 1002, so that not only the fastening connection of the first expansion beam 100 and the cabinet 200 can be conveniently realized, but also the connection reliability between the first expansion beam 100 and the cabinet 200 can be improved.

[0211] The first connecting plate 1001 and the second connecting plate 1002 can be connected with the first expansion beam 100 through a pull rivet nut. The first expansion beam 100 can include a reinforcing plate 30. The flat plate part 31 of the reinforcing plate 30 can be provided with a hollow hole. The hollow hole can be opposite to the first connecting hole 13 on the first plate 10 in the thickness direction of the first expansion beam 100. In this way, the interference between the reinforcing plate 30 and the pull rivet nut inserted into the first connecting hole 13 can be reduced on the premise that the reinforcing plate 30 extends to the end edges of the two ends of the first plate 10 in the length direction.

[0212] In one example, the first connecting plate 1001 includes two sub-plate parts arranged in an L shape. The two sub-plate parts are respectively fitted with the surface of the first plate 10 and the inner wall surface of the cabinet 200. The two sub-plate parts are connected by a circular arc. The connecting position of the two sub-plate parts is provided with a first convex rib.

[0213] In one example, the second connecting plate 1002 includes a first segment, a second segment, and an inclined segment connected between the first segment and the second segment. The first segment is a plate body and is attached to the side wall 201 of the box body 200. The third hole is formed on the first segment. The second segment is a plate and is attached to the surface of the second plate 20. The fourth hole is formed on the second segment. The inclined segment is a plate body that is inclined relative to the first segment and the second segment, and the two ends of the inclined segment are respectively connected to the first segment and the second segment in a circular arc manner.

[0214] The second connecting plate 1002 can be provided with a second protruding rib extending from one end to the other end of the second connecting plate 1002 in the first direction X to improve the structural strength of the second connecting plate 1002. The number of third holes can be multiple, and the multiple third holes can be arranged on both sides of the second protruding rib in the third direction Z. The number of fourth holes can be multiple, and the multiple fourth holes are arranged on both sides of the second protruding rib.

[0215] Please refer to FIG. 5 and FIG. 7, in some embodiments, the battery device 1000 further includes a bracket 650, the bracket 650 is fixed with the bottom wall 202 and arranged at the notch 610, and the reinforcing beam 500 is supported on the bracket 650.

[0216] Specifically, the bracket 650 can be fixed with the bottom wall 202 of the box body 200 and arranged at the notch 610. Along the first direction X, one side of the mounting beam 600 notch 610, the bracket 650 and the other side of the mounting beam 600 notch 610 can be arranged at intervals.

[0217] The number of brackets 650 can be one, and the number of brackets 650 can also be multiple. For example, one, two, three, five or seven and more brackets 650 can be arranged at the notch 610. Therefore, the number of brackets 650 can be set according to the actual support requirement, as long as the inlet part 411 and the outlet part 412 of the heat exchange pipe 410 can pass through the mounting beam 600.

[0218] In this way, the bracket 650 can improve the stability of the reinforcing beam 500, thereby enhancing the structural strength of the first expansion beam 100, and further improving the ability of the first expansion beam 100 to resist the expansion force of the battery cell 300.

[0219] Please refer to FIG. 5 and FIG. 7, in some embodiments, the bracket 650 comprises a support plate 651 and a plurality of support legs 652 arranged along the circumference of the support plate 651, the support leg 652 comprises a support section 6520 and an extension section 6521 arranged in an L shape, the support section 6520 is connected with the bottom wall 202, the extension section 6521 extends away from the support section 6520 along the third direction Z, the support plate 651 is connected with the end of the extension section 6521 of the plurality of support legs 652 away from the support section 6520, the reinforcing beam 500 is supported on the support plate 651 and fixed with the support plate 651 through fasteners.

[0220] Specifically, the number of support legs 652 can be two, three, four, five or more. By arranging a plurality of support legs 652, the structural strength of the bracket 650 can be improved, and the uniformity of the stress on the support plate 651 in the circumferential direction of the support plate 651 can be improved.

[0221] The bracket 650 can be an integral piece. The support plate 651 and the support leg 652 can be connected by a circular arc. The support section 6520 and the extension section 6521 can also be connected by a circular arc. In this way, stress concentration on the bracket 650 can be reduced.

[0222] The bracket 650 can comprise one support plate 651 and four support legs 652. Two of the four support legs 652 can be arranged symmetrically about the first direction X, and the other two support legs 652 can be arranged symmetrically about the second direction Y. The support plate 651 can be arranged between the four support legs 652 and connected with the extension section 6521 of the four support legs 652. The support section 6520 can be connected at the end of the extension section 6521 away from the support plate 651 in the third direction Z and on the side of the extension section 6521 away from the support plate 651 in the thickness direction. In this way, the bracket 650 can be conveniently supported on the bottom wall 202 of the box body 200, and the mutual interference between the support sections 6520 of the plurality of support legs 652 can be reduced.

[0223] A third through hole can be provided on the support plate 651, which penetrates the support plate 651 in the up-down direction. The reinforcing beam 500 can be covered on the upper side of the bracket 650 and supported on the support plate 651, and then fixedly connected with the support plate 651 through fasteners passing through the third through hole.

[0224] In this way, since the bracket 650 comprises a support plate 651 and a plurality of support legs 652 supporting the support plate 651, the structure of the bracket 650 can be simplified, the stability of the bracket 650 in supporting the reinforcing beam 500 can be improved, and the reinforcing beam 500 and the bracket 650 can be fixedly connected.

[0225] Referring to FIGS. 2, 3 and 4, in some embodiments, the battery device 1000 further comprises a second expansion beam 700 extending along the first direction X and spaced apart from the first expansion beam 100 in the second direction Y, and the battery cells 300 are arranged between the first expansion beam 100 and the second expansion beam 700, and the structure of the second expansion beam 700 is the same as or different from that of the first expansion beam 100.

[0226] Specifically, the battery device 1000 can include a plurality of columns of battery cells 300 arranged in sequence along the first direction X. Each column of battery cells 300 can include a plurality of battery cells 300 arranged in sequence and stacked along the second direction Y. The first expansion beam 100 and the second expansion beam 700 are arranged on both sides of the plurality of battery cells 300 in the second direction Y, respectively, for limiting the expansion of the plurality of battery cells 300 in the second direction Y.

[0227] The top of the first expansion beam 100 can be provided with a first fixing point. The top of the second expansion beam 700 can be provided with a second fixing point. The first fixing point and the second fixing point can be connected by a pull rod. In this way, the anti-expansion force of the first expansion beam 100 and the second expansion beam 700 on the battery cells 300 can be enhanced, and the expansion of the battery cells 300 can be effectively inhibited.

[0228] The number of the first fixing point, the second fixing point and the pull rod can be multiple. The plurality of first fixing points, the plurality of second fixing points and the plurality of pull rods can correspond one by one.

[0229] In one embodiment, the second expansion beam 700 can include a first plate 10, a second plate 20 and a reinforcing plate 30. The reinforcing plate 30 is arranged between the first plate 10 and the second plate 20. The first plate 10, the second plate 20 and the reinforcing plate 30 can be integrally formed independent components, and the first plate 10, the second plate 20 and the reinforcing plate 30 can be welded.

[0230] In this way, since the battery device 1000 further comprises the second expansion beam 700, the second expansion beam 700 can cooperate with the first expansion beam 100 to jointly inhibit the expansion of the battery cells 300 in the second direction Y.

[0231] Referring to FIGS. 2 and 3, in one specific embodiment, the battery device 1000 includes a plurality of battery cells 300, a box body 200, a thermal management assembly 400, a first expansion beam 100, a second expansion beam 700, a first connecting plate 1001, a second connecting plate 1002, a mounting beam 600 and two pull rods.

[0232] Specifically, a plurality of battery monomers 300 are arranged in the box body 200, and the plurality of battery monomers 300 are fixed to the bottom wall 202 of the box body 200 by means of threaded connection. The first expansion beam 100 and the second expansion beam 700 are arranged in the box body 200 and are fixed to the side wall 201 of the box body 200. The first expansion beam 100 and the second expansion beam 700 extend along the width direction of the box body 200 and are arranged at intervals in the length direction of the box body 200, and the plurality of battery monomers 300 are arranged between the first expansion beam 100 and the second expansion beam 700.

[0233] Please refer to FIG. 9 and FIG. 10, the first expansion beam 100 includes a first plate 10, a second plate 20 and a reinforcing plate 30. The first plate 10 is vertically arranged and extends left and right, and the upper side of the first plate 10 is provided with a first flange 11, and the lower side is provided with a second flange 12. The left and right ends of the first plate 10 are respectively provided with a first connecting hole 13 which penetrates the first plate 10 in the front-rear direction.

[0234] The second plate 20 includes a main plate 21 and a support plate 22. The main plate 21 is arranged on the upper side of the support plate 22, and the main plate 21 is vertically arranged and extends left and right. The upper side of the main plate 21 is provided with a third flange 211, and the lower side is provided with a first flange 212. The left and right ends of the main plate 21 are respectively formed with a second connecting hole 213 which penetrates the main plate 21 in the front-rear direction. The first flange 212 includes a connecting part 2123 and a recess part 2122 which are arranged alternately in the left-right direction. The left and right ends of the recess part 2122 are connected with the connecting part 2123 and the middle part is concave downward, and each recess part 2122 is formed with a first fixing hole 2121 which penetrates in the up-down direction. Two adjacent recess parts 2122 and the connecting part 2123 cooperatively define a concave groove.

[0235] The support plate 22 is vertically arranged and extends left and right. The upper side of the support plate 22 is provided with a second flange 222, and the lower side is provided with a fourth flange 221. The second flange 222 has a plurality of first lugs 2221 which are arranged at intervals in the left-right direction, and an avoiding part 2222 is defined between two adjacent first lugs 2221. The avoiding part 2222 is a through groove arranged on the second flange 222. The lower side of the support plate 22 is formed with a first avoiding concave groove 223 which is concave upward, and the first avoiding concave groove 223 is located at the middle position of the support plate 22 in the left-right direction.

[0236] Please refer to FIG. 10, the reinforcing plate 30 includes three flat plate portions 31, two bent portions 32 and a third bent edge 33. The flat plate portion 31 is a flat plate extending along the left-right direction and vertically arranged. The bent portion 32 is connected between two adjacent flat plate portions 31 in the up-down direction, and the cross section of the bent portion 32 is U-shaped opening towards the first plate 10. The third bent edge 33 is horizontally arranged and connected to the lower side edge of the lowermost flat plate portion 31, and the third bent edge 33 has a plurality of second lugs 331 arranged in the left-right direction. The plurality of second lugs 331, the plurality of first lugs 2221 and the plurality of connecting portions 2123 are one-to-one corresponding, and each second lug 331 is clamped between the corresponding connecting portion 2123 and the first lug 2221.

[0237] The main plate 21 is provided with a plurality of welding holes. The welding hole is a long strip-shaped hole extending along the left-right direction, and the plurality of welding holes correspond to the bent portion 32 of the reinforcing plate 30. The main plate 21 can be connected to the bent portion 32 of the reinforcing plate 30 by welding at the positions of the plurality of welding holes.

[0238] The number of the first connecting plates 1001 is two, and they are respectively arranged at the two ends of the first plate 10 in the left-right direction. One end of the first connecting plate 1001 is connected to the first plate 10 by a fastener, and the other end is also connected to the side wall of the cabinet 200 in the left-right direction by a fastener. The number of the second connecting plates 1002 is two, and they are respectively arranged at the two ends of the main plate 21 in the left-right direction. One end of the second connecting plate 1002 is fixedly connected to the second plate 20 by a fastener, and the other end is also connected to the side wall of the cabinet 200 in the left-right direction by a fastener.

[0239] Please refer to FIG. 7, the mounting beam 600 includes two parts located on both sides of the notch 610 and a bracket 650 arranged at the notch 610. Among them, the two parts of the mounting beam 600 are connected by the reinforcing beam 500. The bracket 650 is a four-jaw bracket, and the bracket 650 is used to support the reinforcing beam 500. The reinforcing beam 500 is provided with a second avoiding groove 530 for avoiding the heat management assembly 400.

[0240] In the description of the present specification, the description referring to the terms "one embodiment", "certain embodiments", "exemplary embodiment", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the described embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0241] While the embodiments of the present application have been shown and described, it is to be understood that the embodiments can be varied, modified, substituted and changed by those skilled in the art without departing from the principles and spirit of the present application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery device, characterized by, The battery device comprises: a box body; a battery cell arranged in the box body; a mounting beam mounted on the box body and provided with a notch; a first expansion beam mounted in the box body through the mounting beam and matched with the battery cell, the first expansion beam, the mounting beam and a bottom wall of the box body jointly defining an avoiding passage communicated with the notch; a heat management assembly arranged in the box body and matched with the battery cell in heat exchange, the heat management assembly comprising an inlet portion and an outlet portion, at least one of the inlet portion and the outlet portion being arranged in the avoiding passage; wherein the battery device further comprises a reinforcing beam arranged at the notch, the reinforcing beam being connected with the wall bodies on both sides of the notch and connected with the first expansion beam.

2. The battery device of claim 1, wherein The reinforcing beam is transversely arranged in the notch and connected with the wall bodies on both sides of the notch formed by the mounting beam; alternatively, the reinforcing beam covers the notch and is connected with the wall bodies on both sides of the notch adjacent to the mounting beam.

3. The battery device according to claim 1 or 2, characterized by The reinforcing beam comprises a first reinforcing portion and a second reinforcing portion connected at an angle, the first reinforcing portion being connected with the mounting beam and the second reinforcing portion being connected with the first expansion beam.

4. The battery device of claim 3, wherein The mounting beam comprises a first beam, a second beam and a third beam connected at an angle in sequence, the first beam and the third beam being connected with the bottom wall of the box body, the first beam being closer to the battery cell than the third beam; the first reinforcing portion is connected with the third beam and the second reinforcing portion is connected with the second beam.

5. The battery device according to any one of claims 1 to 4, characterized by, The number of the notches is one or more; when the number of the notches is more than one, the number of the mounting beams is also more than one and corresponds to the number of the notches; or when the number of the notches is more than one, the number of the mounting beams is one, and one mounting beam is opposite to the plurality of notches.

6. The battery device according to any one of claims 1 to 5, wherein The heat management assembly is formed by bending a heat exchange pipe, and the inlet portion and the outlet portion of the heat exchange pipe are arranged adjacent to each other, so that the inlet portion and the outlet portion of the heat exchange pipe are arranged in the notch.

7. The battery device of claim 6, wherein The number of the heat exchange pipes is more than one, the inlet portions and the outlet portions of the plurality of heat exchange pipes are concentrated and arranged adjacent to each other, and are arranged in one notch; alternatively, the number of the heat exchange pipes is more than one, and the number of the notches is also more than one, the inlet portion and the outlet portion of each heat exchange pipe being arranged in one notch.

8. The battery device according to claim 6 or 7, characterized by The heat exchange pipe gradually extends and bends from the periphery of the battery device to the middle position of the battery device.

9. The battery device according to any one of claims 6 to 8, wherein The number of the heat exchange pipes is more than one, and the heat exchange pipes are arranged in parallel.

10. The battery device according to any one of claims 6 to 9, wherein The bottom wall is provided with a mounting groove, and the heat exchange pipe is arranged in the mounting groove and extends along the extension direction of the mounting groove.

11. The battery device according to any one of claims 1 to 10, characterized by, The first expansion beam comprises a plurality of plate bodies, the plurality of plate bodies are sheet metal parts, and the plurality of plate bodies are welded to form the first expansion beam.

12. The battery device according to any one of claims 1 to 11, characterized by, The first expansion beam comprises a plurality of plate bodies connected and arranged, and each of the plate bodies comprises a first plate and a second plate, the first plate and the second plate extend along a first direction and are arranged along a second direction, and two ends of the first plate are connected with two ends of the second plate along a third direction, and cooperate to define a cavity of the first expansion beam, the first direction, the second direction and the third direction intersect with each other.

13. The battery device of claim 12, wherein, In the third direction, the two ends of the first plate are provided with a first flange and a second flange extending towards the second plate, the two ends of the second plate are provided with a third flange and a fourth flange extending towards the first plate, the first flange is connected with the third flange in a lap joint manner, and the second flange is connected with the fourth flange in a lap joint manner.

14. The battery device according to claim 12 or 13, characterized by, The second plate comprises a main plate and a support plate arranged separately, the main plate is arranged on a side of the support plate away from the bottom wall along the third direction, the main plate is provided with a first folding edge extending away from the second plate along the second direction, and the support plate is provided with a second folding edge extending away from the second plate along the second direction, the first folding edge and the second folding edge are arranged in a laminated manner and are connected.

15. The battery device of claim 14, wherein, The first folding edge is formed with a plurality of first fixing holes penetrating through the first folding edge along the third direction, the first fixing holes are arranged in a spaced manner along the first direction, the first expansion beam is connected with the mounting beam by penetrating a part of the first fixing holes with fasteners, and the first expansion beam is connected with the reinforcing beam by penetrating another part of the first fixing holes with fasteners.

16. The battery device of claim 15, wherein, The first folding edge comprises a plurality of connecting portions and a plurality of recessed portions, the recessed portions and the connecting portions are arranged in an alternating manner along the first direction, the recessed portions are recessed and formed towards the support plate from the first folding edge, and each of the recessed portions is formed with at least one first fixing hole, The second folding edge comprises a plurality of first lugs extending away from the first plate along the second direction, the first lugs are arranged in a spaced manner along the first direction, and an avoiding portion is defined between two adjacent first lugs, The recessed portions are located in the avoiding portions, and the connecting portions and the first lugs correspond to each other and are connected.

17. The battery device according to any one of claims 14 to 16, wherein A first avoiding groove recessed towards the main plate is formed on a side of the support plate away from the main plate along the third direction, the reinforcing beam is formed with a second avoiding groove, and the first avoiding groove and the second avoiding groove are arranged in a spaced manner along the second direction, and the first avoiding groove and the second avoiding groove are used for avoiding the inlet portion and the outlet portion.

18. The battery device according to any one of claims 14 to 17, wherein The plate bodies further comprise a reinforcing plate, the reinforcing plate extends along the first direction, the reinforcing plate is arranged between the first plate and the second plate, and is connected with the first plate and the second plate.

19. The battery device of claim 18, wherein, The reinforcing plate comprises a flat plate portion and a bent portion, the flat plate portion is connected with a surface of the first plate in a fit manner, the bent portion is connected with the flat plate portion and is formed in a U-shaped structure extending along the first direction and opening towards the first plate along the second direction.

20. The battery device of claim 19, wherein, The number of the bending parts is multiple, and the multiple bending parts are arranged at intervals along the third direction, and the flat plate part is connected between two adjacent bending parts and on both sides of the multiple bending parts in the third direction.

21. The battery device according to claim 19 or 20, characterized by The reinforcing plate further comprises a third flange connected with the flat plate part, and the third flange has multiple second lugs extending away from the first plate along the second direction, and the multiple second lugs are arranged at intervals along the first direction, and the multiple second lugs are clamped between the first flange and the second flange and are welded to the first flange and the second flange.

22. The battery device of any one of claims 12-21, wherein, Further comprising: A first connecting plate fixed to the side wall of the box by a fastener, and the first plate has first connecting holes penetrating the first plate along the second direction at both ends of the first plate in the first direction, and the first plate is fastened and connected to the first connecting plate by a fastener penetrating the first connecting hole; A second connecting plate fixed to the side wall of the box by a fastener, and the second plate has second connecting holes penetrating the second plate along the second direction at both ends of the second plate in the first direction, and the second plate is fastened and connected to the second connecting plate by a fastener penetrating the second connecting hole.

23. The battery device of any one of claims 1-22, wherein, The battery device further comprises a support fixed to the bottom wall and arranged at the notch, and the reinforcing beam is supported on the support.

24. The battery device of claim 23, wherein, The support comprises a support plate and multiple support legs arranged along the circumference of the support plate, and the support leg comprises a support section and an extension section arranged in an L shape, the support section is connected with the bottom wall, and the extension section extends away from the support section along a third direction, the support plate is connected with one end of the extension section of the multiple support legs away from the support section, and the reinforcing beam is supported on the support plate and fixed to the support plate by a fastener.

25. The battery device of any one of claims 1-24, wherein, Further comprising: A second expansion beam extending along a first direction and arranged at intervals with the first expansion beam in a second direction, and the battery monomer is arranged between the first expansion beam and the second expansion beam, and the structure of the second expansion beam is the same as or different from that of the first expansion beam.

26. An electrical device, comprising: The battery device comprises any one of claims 1-25. The battery device comprises any one of claims 1-25.

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