Battery device, expansion beam assembly, battery box and electric appliance

Abstract

The application discloses a battery device, an expansion beam assembly, a battery box and an electric equipment. The battery device comprises a battery monomer and a battery box. The battery box comprises at least a box body and an expansion beam assembly. The box body forms an accommodating space for accommodating the battery monomer. The expansion beam assembly is arranged in the accommodating space. The expansion beam assembly comprises an expansion beam and a mounting assembly. The mounting assembly is connected to the box body. The expansion beam is supported on at least part of the mounting assembly and abuts against the battery monomer. The box body comprises a sheet metal box body. The expansion beam comprises an aluminum profile expansion beam. By adopting the aluminum profile expansion beam as the expansion beam of the battery box, the weight of the expansion beam can be significantly reduced, so that the inertial force generated by the expansion beam during vibration or collision can be reduced, the risk of fatigue damage or fracture of the expansion beam can be reduced, and the reliability of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device, an expansion beam assembly, a battery housing, and an electrical device. Background Technology

[0002] During the charging and discharging process of a battery device, individual battery cells will expand due to factors such as internal chemical reactions, temperature changes, or electrode material characteristics. Therefore, expansion beams are usually installed inside the casing to withstand the expansion force of the individual battery cells.

[0003] Existing expansion beams typically use high-strength structures such as steel expansion beams, which are installed inside the box body through welding. Although steel expansion beams have high strength, they also have a high density, resulting in excessive weight. Excessive weight leads to greater inertial forces during vibration or collision, which can easily cause fatigue damage or breakage of the expansion beam, affecting the reliability of the battery device. Utility Model Content

[0004] In view of the above problems, this application provides a battery device, an expansion beam assembly, a battery housing, and electrical equipment to reduce the weight of the expansion beam, reduce the risk of fatigue damage or breakage of the expansion beam, and thus improve the reliability of the battery device.

[0005] Firstly, this application provides a battery device, including a battery cell and a battery housing. The battery housing includes at least: a housing body forming a receiving space for accommodating the battery cell; and an expansion beam assembly disposed within the receiving space, the expansion beam assembly including an expansion beam and a mounting assembly. The mounting assembly is connected to the housing body, and the expansion beam is supported on at least a portion of the mounting assembly and abuts against the battery cell. The housing body includes a sheet metal housing body, and the expansion beam includes an aluminum profile expansion beam. By connecting the mounting assembly to the sheet metal housing body and supporting the expansion beam on the mounting assembly, the flexibility in material selection for both the expansion beam and the mounting assembly is improved. The mounting assembly can be made of the same material as the sheet metal housing body, enhancing the connection strength and stability between the mounting assembly and the sheet metal housing body. This enhances the structural strength and stability of the expansion beam supported on the mounting assembly, allowing the use of an aluminum profile expansion beam as the expansion beam of the battery housing. Aluminum profile expansion beams are characterized by high strength and light weight, significantly reducing the weight of the expansion beam compared to related technologies that weld steel expansion beams integrally to the housing body. Firstly, by using aluminum profile expansion beams as the expansion beams of the battery box, the overall weight of the battery box can be reduced. This reduces the inertial force generated by the expansion beams during vibration or collision, lowering the risk of fatigue damage or breakage and thus improving the reliability of the battery device. Secondly, by using aluminum profile expansion beams as the expansion beams of the battery box, the overall weight of the battery box can also be reduced. When the battery box is used in the vehicle's battery device, the weight of the battery device can reduce the impact on the vehicle's energy consumption and range. Thirdly, the mounting components can act as intermediate transmission components for expansion forces, dispersing the expansion forces borne by the aluminum profile expansion beams to a wider area of ​​the sheet metal box body, thereby reducing stress concentration and lowering the risk of deformation or cracking of the sheet metal box body.

[0006] In some embodiments, the expansion beam assembly further includes a connector that connects the aluminum profile expansion beam, the mounting assembly, and the sheet metal housing body, and is located on the side of the aluminum profile expansion beam facing away from the battery cell. On one hand, the connector provides a supporting force to the aluminum profile expansion beam opposite to the expansion force it bears, which not only improves the anti-tipping ability of the aluminum profile expansion beam but also offsets part of the expansion force, thus alleviating stress concentration and weakening the expansion force transmitted to the sheet metal housing body, significantly improving the reliability of the sheet metal housing body. On the other hand, the connector can distribute the expansion force borne by the aluminum profile expansion beam to the mounting assembly and the sheet metal housing body, thereby providing multiple dispersion paths for the expansion force, reducing the impact of the expansion force on the aluminum profile expansion beam, and further improving the reliability of the aluminum profile expansion beam.

[0007] In some embodiments, the expansion beam assembly includes two connectors, one of which is located at one end of the aluminum profile expansion beam along its extension direction, and the other of which is located at the other end of the aluminum profile expansion beam along its extension direction. This arrangement, on the one hand, ensures that the diffusion of the expansion force borne by the aluminum profile expansion beam along its extension direction is not restricted, facilitating rapid diffusion of the expansion force and reducing stress concentration; on the other hand, by placing the connectors at both ends of the aluminum profile expansion beam along its extension direction, the central region of the aluminum profile expansion beam on the side facing away from the battery cell is left open, forming a continuous wiring channel, which reduces the risk of wiring being forced to detour or be segmented due to obstruction by the connectors.

[0008] In some embodiments, the connector includes a first connecting portion and a second connecting portion connected to each other. The first connecting portion connects to the side of the aluminum profile expansion beam facing away from the battery cell, and the second connecting portion connects to the mounting assembly. This configuration, on the one hand, allows the side of the aluminum profile expansion beam facing away from the battery cell to be supported on the mounting assembly, which not only improves the anti-tipping ability of the aluminum profile expansion beam but also offsets part of the expansion force, thereby weakening the expansion force transmitted to the sheet metal box body and improving the reliability of the sheet metal box body. On the other hand, it allows the expansion force borne by the aluminum profile expansion beam to be not only directly distributed to the mounting assembly but also distributed to the mounting assembly through the first and second connecting portions, thus providing multiple dispersion paths for the expansion force, improving the release efficiency of the expansion force borne by the aluminum profile expansion beam, and thereby reducing the impact of the expansion force on the aluminum profile expansion beam.

[0009] In some embodiments, the connector further includes a third connecting portion that connects the first connecting portion and the second connecting portion, and the third connecting portion connects to the sheet metal box body. The third connecting portion not only provides support for the first connecting portion and the second connecting portion, reducing the risk of deformation or breakage of the first connecting portion and the second connecting portion, thereby improving the structural strength of the connector, but also directly disperses the expansion force borne by the aluminum profile expansion beam onto the sheet metal box body, thereby further improving the release efficiency of the expansion force and reducing the impact of the expansion force on the aluminum profile expansion beam and mounting components.

[0010] In some embodiments, the mounting assembly is connected to the base plate of the sheet metal box body, and the aluminum profile expansion beam is supported on the side of the mounting assembly facing away from the base plate. The base plate, as the load-bearing structure of the battery box, has stronger resistance to compression and deformation. By connecting the mounting assembly to the base plate of the sheet metal box body and supporting the aluminum profile expansion beam on the side of the mounting assembly facing away from the base plate, not only is the structural strength of the mounting assembly connected to the base plate enhanced, thereby increasing the structural strength and stability of the aluminum profile expansion beam, but the base plate can also better withstand and disperse expansion forces, significantly reducing the risk of deformation or cracking of the sheet metal box body.

[0011] In some embodiments, the mounting assembly includes: two support bases, respectively disposed in two corner areas of the sheet metal box body arranged opposite each other along a first direction; a mounting body connected to the same side of the two support bases, and a connector connected to the side of the mounting body facing away from the support bases; wherein the support bases, the mounting body, and the aluminum profile expansion beam are arranged sequentially along a second direction, and the aluminum profile expansion beam and the connector are arranged along a third direction, with the first direction, the second direction, and the third direction being perpendicular to each other. On the one hand, by placing two support bases at two corner areas opposite each other along the first direction of the sheet metal box body, not only can the structural strength of the corner areas be enhanced, but the expansion force and stress of the corner areas can also be dispersed to other areas of the sheet metal box body, thereby reducing the risk of deformation or cracking due to stress overload in the corner areas and improving the reliability of the battery box body. On the other hand, by connecting the mounting body to the same side of the two support bases and placing the aluminum profile expansion beam on the side of the mounting body facing away from the support bases, the support bases can provide support force for the aluminum profile expansion beam and the two ends of the mounting body along the first direction, and can guide the expansion force borne by the aluminum profile expansion beam to diffuse towards both ends along the first direction, thereby reducing the impact of the expansion force on the middle area of ​​the aluminum profile expansion beam, thereby reducing the risk of cracking or deformation of the aluminum profile expansion beam.

[0012] In some embodiments, the mounting body includes: a first bearing portion, spaced apart from the support base along a second direction; two first transition portions, connected to opposite ends of the first bearing portion along a third direction and extending toward the base plate, the first transition portions and the support base being spaced apart along a third direction; two first abutting portions, one of the two first abutting portions being connected to one end of a first transition portion away from the first bearing portion, and the other being connected to one end of another first transition portion away from the first bearing portion, the side of the first abutting portion facing away from the first transition portion being connected to the support base; wherein, an aluminum profile expansion beam is supported on the first abutting portion near the battery cell, and partially extends to the side of the first bearing portion facing away from the support base, and is connected to the first bearing portion. By arranging the first bearing portion and the support base at intervals along the second direction, and the second transition portion and the support base at intervals along the third direction, a first gap is formed between the first bearing portion and the support base, and a second gap is formed between the first transition portion and the support base. On the one hand, the first gap and the second gap can absorb part of the expansion force, so as to quickly and evenly distribute the expansion force to the sheet metal box body, thereby mitigating the impact of the expansion force on the expansion beam assembly. On the other hand, since both the first gap and the second gap extend along the first direction, they can form a natural air convection channel, which helps the heat dissipation of the battery cells, thereby improving the heat dissipation efficiency of the battery cells. Thirdly, the first gap and the second gap can be used to contain gas. When the mounting components are subjected to external impact or vibration, the gas in the gap will be compressed, thereby playing a buffering and shock absorption role, which can enhance the structural strength and stability of the expansion beam assembly.

[0013] In some embodiments, the aluminum profile expansion beam includes: a beam body supported by a first abutment portion; and a fixing portion disposed on the side of the beam body opposite to the battery cell, extending to the side of the first bearing portion opposite to the support base, and connected to the first bearing portion. By providing a fixing portion on the side of the beam body opposite to the battery cell, the beam body can be fixed to the mounting body, which not only improves the positioning and installation speed of the beam body, but also enhances the connection strength and stability between the aluminum profile expansion beam and the mounting assembly.

[0014] In some embodiments, the sheet metal box body includes two first side plates disposed opposite to each other along a first direction, the two first side plates being connected to the outer edge of the bottom plate to form an accommodating space; the support base includes: a support body extending along a first direction for supporting the mounting body; a connecting portion connected to one end of the support body near the first side plate adjacent to the corner area, and bent toward the corner area; and an extension portion connected to one end of the connecting portion away from the support body, and extending along a third direction. By configuring the support body for supporting the mounting body to extend along a first direction, the contact area between the mounting body and the support body is increased, thereby improving the connection strength and stability between the mounting body and the support body, and thus improving the structural strength and stability of the aluminum profile expansion beam. By setting a connecting part between the support body and the extension, it can not only adapt to the changes in the corner area of ​​the sheet metal box body, but also alleviate the deformation from the mounting body to the extension, so that the expansion force can be evenly distributed from the mounting body to the extension, reducing the risk of deformation or cracking of the support seat due to stress concentration. By setting the extension at the end of the connecting part away from the mounting body, the expansion force can be distributed to the area away from the aluminum profile expansion beam through the extension, thereby reducing the concentration of expansion force near the aluminum profile expansion beam, reducing the risk of deformation or cracking of the aluminum profile expansion beam and the area of ​​the sheet metal box body near the aluminum profile expansion beam.

[0015] In some embodiments, the support body includes: a second bearing portion, which is spaced apart from and opposite to the first bearing portion and the base plate along a second direction; two second transition portions, which are connected to opposite ends of the second bearing portion along a third direction and extend toward the base plate; and two second abutting portions, one of which is connected to the end of a second transition portion away from the second bearing portion, and the other is connected to the end of another second transition portion away from the second bearing portion. The second abutting portions are connected to the base plate, and their side facing away from the base plate abuts against the first abutting portion. By arranging the second bearing portion and the base plate spaced apart along the second direction, and the two second transition portions being connected to opposite ends of the second bearing portion along a third direction and extending toward the base plate, a second cavity is formed. The second cavity, together with the first gap and the second gap, can absorb the expansion force, thereby further improving the diffusion efficiency and effect of the expansion force. At the same time, the formation of the second cavity can also further improve the heat dissipation efficiency and the buffering and shock absorption effect.

[0016] In some embodiments, the extension includes a first portion and a second portion connected to each other. The first portion is connected to the base plate, and the second portion is connected to the first side plate. The first portion can distribute the expansion force to the base plate, and the second portion can distribute the aluminum profile expansion beam to the first side plate, thereby simultaneously distributing the expansion force to multiple structures of the sheet metal box body. This reduces the risk of deformation or cracking of a structure due to the concentrated distribution of expansion force on a single structure, and improves the reliability of the battery box.

[0017] Secondly, this application provides an expansion beam assembly, comprising: an expansion beam; and a mounting assembly for connecting a sheet metal box body to a battery box, wherein the expansion beam is supported on at least a portion of the mounting assembly and for abutting against a battery cell; wherein the expansion beam comprises an aluminum profile expansion beam. By connecting the mounting assembly to the sheet metal box body and supporting the expansion beam on the mounting assembly, on the one hand, the flexibility in material selection for both the expansion beam and the mounting assembly can be improved. The mounting assembly can be made of the same material as the sheet metal box body to enhance the connection strength and stability between the mounting assembly and the sheet metal box body, thereby enhancing the structural strength and stability of the expansion beam supported on the mounting assembly. This allows the use of an aluminum profile expansion beam as the expansion beam for the battery box body. The aluminum profile expansion beam has the characteristics of high strength and light weight. Compared with the related technology of welding a steel expansion beam integrally to the box body, it can significantly reduce the weight of the expansion beam. Firstly, by using aluminum profile expansion beams as the expansion beams of the battery box, the overall weight of the battery box can be reduced. This reduces the inertial force generated by the expansion beams during vibration or collision, lowering the risk of fatigue damage or breakage and thus improving the reliability of the battery device. Secondly, by using aluminum profile expansion beams as the expansion beams of the battery box, the overall weight of the battery box can also be reduced. When the battery box is used in the vehicle's battery device, the weight of the battery device can reduce the impact on the vehicle's energy consumption and range. Thirdly, the mounting components can act as intermediate transmission components for expansion forces, dispersing the expansion forces borne by the aluminum profile expansion beams to a wider area of ​​the sheet metal box body, thereby reducing stress concentration and lowering the risk of deformation or cracking of the sheet metal box body.

[0018] In some embodiments, the expansion beam assembly further includes a connector for connecting the aluminum profile expansion beam, the mounting assembly, and the sheet metal housing body, and is located on the side of the aluminum profile expansion beam facing away from the battery cell. On one hand, the connector provides a supporting force to the aluminum profile expansion beam opposite to the expansion force it bears, which not only improves the anti-tipping ability of the aluminum profile expansion beam but also offsets part of the expansion force, thus alleviating stress concentration and weakening the expansion force transmitted to the sheet metal housing body, significantly improving the reliability of the sheet metal housing body. On the other hand, the connector can distribute the expansion force borne by the aluminum profile expansion beam to the mounting assembly and the sheet metal housing body, thereby providing multiple dispersion paths for the expansion force, reducing the impact of the expansion force on the aluminum profile expansion beam, and further improving the reliability of the aluminum profile expansion beam.

[0019] In some embodiments, the expansion beam assembly includes two connectors, one of which is located at one end of the aluminum profile expansion beam along its extension direction, and the other of which is located at the other end of the aluminum profile expansion beam along its extension direction. This arrangement, on the one hand, ensures that the diffusion of the expansion force borne by the aluminum profile expansion beam along its extension direction is not restricted, facilitating rapid diffusion of the expansion force and reducing stress concentration; on the other hand, by placing the connectors at both ends of the aluminum profile expansion beam along its extension direction, the central region of the aluminum profile expansion beam on the side facing away from the battery cell is left open, forming a continuous wiring channel, which reduces the risk of wiring being forced to detour or be segmented due to obstruction by the connectors.

[0020] In some embodiments, the connector includes a first connecting portion and a second connecting portion connected to each other. The first connecting portion connects to the side of the aluminum profile expansion beam facing away from the battery cell, and the second connecting portion connects to the mounting assembly. This configuration, on the one hand, allows the side of the aluminum profile expansion beam facing away from the battery cell to be supported on the mounting assembly, which not only improves the anti-tipping ability of the aluminum profile expansion beam but also offsets part of the expansion force, thereby weakening the expansion force transmitted to the sheet metal box body and improving the reliability of the sheet metal box body. On the other hand, it allows the expansion force borne by the aluminum profile expansion beam to be not only directly distributed to the mounting assembly but also distributed to the mounting assembly through the first and second connecting portions, thus providing multiple dispersion paths for the expansion force, improving the release efficiency of the expansion force borne by the aluminum profile expansion beam, and thereby reducing the impact of the expansion force on the aluminum profile expansion beam.

[0021] In some embodiments, the connector further includes a third connecting portion that connects the first connecting portion and the second connecting portion, the third connecting portion being used to connect the sheet metal box body. The third connecting portion not only provides support for the first and second connecting portions, reducing the risk of deformation or breakage of the first and second connecting portions and thus improving the structural strength of the connector, but also directly distributes the expansion force borne by the aluminum profile expansion beam onto the sheet metal box body, thereby further improving the efficiency of expansion force release and reducing the impact of the expansion force on the aluminum profile expansion beam and mounting components.

[0022] In some embodiments, the mounting assembly is used to connect to the base plate of the sheet metal box body, and the aluminum profile expansion beam is supported on the side of the mounting assembly facing away from the base plate. As the load-bearing structure of the battery box, the base plate has stronger resistance to compression and deformation. By connecting the mounting assembly to the base plate of the sheet metal box body and supporting the aluminum profile expansion beam on the side of the mounting assembly facing away from the base plate, not only is the structural strength of the mounting assembly connected to the base plate enhanced, thereby increasing the structural strength and stability of the aluminum profile expansion beam, but the base plate can also better withstand and disperse expansion forces, significantly reducing the risk of deformation or cracking of the sheet metal box body.

[0023] In some embodiments, the mounting assembly includes: two support bases for being respectively disposed in two corner areas of the sheet metal box body that are disposed opposite to each other along a first direction; a mounting body connected to the same side of the two support bases, and a connector connected to the side of the mounting body facing away from the support bases; wherein the support bases, the mounting body, and the aluminum profile expansion beam are arranged sequentially along a second direction, and the aluminum profile expansion beam and the connector are arranged along a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other. On the one hand, by placing two support bases at two corner areas opposite each other along the first direction of the sheet metal box body, not only can the structural strength of the corner areas be enhanced, but the expansion force and stress of the corner areas can also be dispersed to other areas of the sheet metal box body, thereby reducing the risk of deformation or cracking due to stress overload in the corner areas and improving the reliability of the battery box body. On the other hand, by connecting the mounting body to the same side of the two support bases and placing the aluminum profile expansion beam on the side of the mounting body facing away from the support bases, the support bases can provide support force for the aluminum profile expansion beam and the two ends of the mounting body along the first direction, and can guide the expansion force borne by the aluminum profile expansion beam to diffuse towards both ends along the first direction, thereby reducing the impact of the expansion force on the middle area of ​​the aluminum profile expansion beam, thereby reducing the risk of cracking or deformation of the aluminum profile expansion beam.

[0024] In some embodiments, the mounting body includes: a first bearing portion, spaced apart from the support base along a second direction; two first transition portions, for being relatively connected to opposite ends of the first bearing portion along a third direction and extending toward the base plate, the first transition portions and the support base being spaced apart along a third direction; two first abutting portions, one of the two first abutting portions being connected to one end of a first transition portion away from the first bearing portion, and the other being connected to one end of another first transition portion away from the first bearing portion, the side of the first abutting portion facing away from the first transition portion being connected to the support base; wherein, an aluminum profile expansion beam is supported on the first abutting portion for proximity to the battery cell, and partially extends to the side of the first bearing portion facing away from the support base, and is connected to the first bearing portion. By arranging the first bearing portion and the support base at intervals along the second direction, and the second transition portion and the support base at intervals along the third direction, a first gap is formed between the first bearing portion and the support base, and a second gap is formed between the first transition portion and the support base. On the one hand, the first gap and the second gap can absorb part of the expansion force, so as to quickly and evenly distribute the expansion force to the sheet metal box body, thereby mitigating the impact of the expansion force on the expansion beam assembly. On the other hand, since both the first gap and the second gap extend along the first direction, they can form a natural air convection channel, which helps the heat dissipation of the battery cells, thereby improving the heat dissipation efficiency of the battery cells. Thirdly, the first gap and the second gap can be used to contain gas. When the mounting components are subjected to external impact or vibration, the gas in the gap will be compressed, thereby playing a buffering and shock absorption role, which can enhance the structural strength and stability of the expansion beam assembly.

[0025] In some embodiments, the support base includes: a support body extending along a first direction for supporting the mounting body; a connecting portion connected to one end of the support body for approaching a first side plate adjacent to the sheet metal box body and the corner area thereon, and bent toward the corner area; and an extension portion connected to one end of the connecting portion away from the support body, and extending along a third direction. By configuring the support body for supporting the mounting body to extend along a first direction, the contact area between the mounting body and the support body is increased, thereby improving the connection strength and stability between the mounting body and the support body, and thus improving the structural strength and stability of the aluminum profile expansion beam. By setting a connecting part between the support body and the extension, it can not only adapt to the changes in the corner area of ​​the sheet metal box body, but also alleviate the deformation from the mounting body to the extension, so that the expansion force can be evenly distributed from the mounting body to the extension, reducing the risk of deformation or cracking of the support seat due to stress concentration. By setting the extension at the end of the connecting part away from the mounting body, the expansion force can be distributed to the area away from the aluminum profile expansion beam through the extension, thereby reducing the concentration of expansion force near the aluminum profile expansion beam, reducing the risk of deformation or cracking of the aluminum profile expansion beam and the area of ​​the sheet metal box body near the aluminum profile expansion beam.

[0026] In some embodiments, the support body includes: a second bearing portion, which is spaced apart from and opposite to the first bearing portion and the base plate along a second direction; two second transition portions, which are connected to opposite ends of the second bearing portion along a third direction and extend toward the base plate; and two second abutting portions, one of which is connected to the end of a second transition portion away from the second bearing portion, and the other is connected to the end of another second transition portion away from the second bearing portion. The second abutting portions are connected to the base plate, and their side facing away from the base plate abuts against the first abutting portion. By arranging the second bearing portion and the base plate spaced apart along the second direction, and the two second transition portions being connected to opposite ends of the second bearing portion along a third direction and extending toward the base plate, a second cavity is formed. The second cavity, together with the first gap and the second gap, can absorb the expansion force, thereby further improving the diffusion efficiency and effect of the expansion force. At the same time, the formation of the second cavity can also further improve the heat dissipation efficiency and the buffering and shock absorption effect.

[0027] Thirdly, this application provides a battery housing, which includes: a sheet metal housing body; and the aforementioned expansion beam assembly.

[0028] Fourthly, this application provides an electrical device including the aforementioned battery device. Attached Figure Description

[0029] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0030] Figure 1 This is a schematic diagram of the structure of an embodiment of the electrical equipment provided in this application;

[0031] Figure 2 This is a structural schematic diagram of an embodiment of the battery housing provided in this application;

[0032] Figure 3 yes Figure 2 Enlarged view of part A in the image;

[0033] Figure 4 yes Figure 2 Enlarged view of part B in the image;

[0034] Figure 5 This is a cross-sectional view of the battery housing structure provided in this application.

[0035] The reference numerals in the detailed embodiments are as follows:

[0036] Vehicle 1000a, controller 200a, motor 300a, battery device 100a, battery box 101, sheet metal box body 10, accommodating space 10a, base plate 11, first side plate 12, second side plate 13, corner area 14, expansion beam assembly 20, aluminum profile expansion beam 21, first cavity 21a, beam body 211, fixing part 212, first fixing hole 212a, mounting component 22, first gap 22a, second gap 22b, second cavity 2 2c, mounting body 221, first bearing part 2211, first transition part 2212, first abutment part 2213, support base 222, support body 2221, second bearing part 2221a, second transition part 2221b, second abutment part 2221c, connecting part 2222, extension part 2223, first part 2223a, second part 2223b, connector 23, first connecting part 231, second connecting part 232, third connecting part 233. Detailed Implementation

[0037] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0039] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0041] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0042] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0043] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate heat exchange medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0044] During the charging and discharging process of a battery device, individual battery cells expand due to internal chemical reactions, temperature changes, or electrode material characteristics. If this expansion is uncontrolled, adjacent cells may become compressed due to excessive expansion, potentially damaging the internal separator and causing a short circuit, which could then lead to thermal runaway. Therefore, expansion beams are typically installed within the battery housing to withstand the expansion forces of the individual cells, thereby limiting excessive expansion and reducing the risk of short circuits.

[0045] Existing expansion beams typically use high-strength structures such as steel expansion beams, which are installed inside the box body through welding. Although steel expansion beams have high strength, they also have a high density, resulting in excessive weight. Excessive weight leads to greater inertial forces during vibration or collision, which can easily cause fatigue damage or breakage of the expansion beam, affecting the reliability of the battery device.

[0046] Based on the above considerations, this application provides a battery device, an expansion beam assembly, a battery housing, and electrical equipment. The battery device includes individual battery cells and a battery housing. The battery housing includes at least a housing body and an expansion beam assembly. The housing body forms a receiving space for accommodating the individual battery cells. The expansion beam assembly is disposed within the receiving space and includes an expansion beam and a mounting assembly. The mounting assembly is connected to the housing body, and the expansion beam is supported on at least a portion of the mounting assembly and abuts against the individual battery cells. The housing body includes a sheet metal housing body, and the expansion beam includes an aluminum profile expansion beam. By connecting the mounting components to the sheet metal enclosure body and supporting the expansion beam on the mounting components, the flexibility in material selection for both the expansion beam and the mounting components is improved. The mounting components can be made of the same material as the sheet metal enclosure body, enhancing the connection strength and stability between the mounting components and the sheet metal enclosure body. This, in turn, enhances the structural strength and stability of the expansion beam supported on the mounting components, allowing the use of aluminum profile expansion beams as the battery enclosure's expansion beams. Aluminum profile expansion beams are characterized by high strength and lightweight, significantly reducing the weight of the expansion beam compared to related technologies that weld steel expansion beams integrally to the enclosure body. Firstly, by using aluminum profile expansion beams as the expansion beams of the battery box, the overall weight of the battery box can be reduced. This reduces the inertial force generated by the expansion beams during vibration or collision, lowering the risk of fatigue damage or breakage and thus improving the reliability of the battery device. Secondly, by using aluminum profile expansion beams as the expansion beams of the battery box, the overall weight of the battery box can also be reduced. When the battery box is used in the vehicle's battery device, the weight of the battery device can reduce the impact on the vehicle's energy consumption and range. Thirdly, the mounting components can act as intermediate transmission components for expansion forces, dispersing the expansion forces borne by the aluminum profile expansion beams to a wider area of ​​the sheet metal box body, thereby reducing stress concentration and lowering the risk of deformation or cracking of the sheet metal box body.

[0047] The battery device, battery housing, and electrical equipment disclosed in this application can be used in electrical equipment that uses the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0048] For ease of explanation, the following embodiments will be described using a vehicle 1000a as an example of an electrical device according to an embodiment of this application.

[0049] Please refer to Figure 1The vehicle 1000a can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100a is installed inside the vehicle 1000a, and the battery device 100a can be located at the bottom of the vehicle 1000a. The battery device 100a can be used to power the vehicle 1000a; for example, the battery device 100a can serve as the operating power source for the vehicle 1000a. The vehicle 1000a may also include a controller 200a and a motor 300a. The controller 200a is used to control the battery device 100a to supply power to the motor 300a, for example, to meet the power needs of the vehicle 1000a during starting, navigation, and driving.

[0050] In some embodiments of this application, the battery device 100a can not only serve as the operating power source for the vehicle 1000a, but also as the driving power source for the vehicle 1000a, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000a.

[0051] In some embodiments, the battery device 100a may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0052] The battery device 100a mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0053] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0054] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0055] A single battery cell includes an electrode assembly. The electrode assembly is mainly formed by winding or stacking a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrode. The portions of the positive and negative electrode containing active material constitute the main body of the electrode assembly; the portions of the positive electrode without active material constitute the positive electrode tab; and the portions of the negative electrode without active material constitute the negative electrode tab. During the charging and discharging process of the battery device 100a, the positive and negative active materials react with the electrolyte to form a current circuit.

[0056] Please refer to Figures 2 to 3The battery assembly 100a includes individual battery cells (not shown) and a battery housing 101. The battery housing 101 includes at least a housing body and an expansion beam assembly 20. The housing body forms a receiving space 10a for receiving the individual battery cells. The expansion beam assembly 20 is disposed within the receiving space 10a. The expansion beam assembly 20 includes an expansion beam and a mounting assembly 22. The mounting assembly 22 is connected to the housing body, and the expansion beam is supported on at least a portion of the mounting assembly 22 and abuts against the individual battery cells. The housing body includes a sheet metal housing body 10, and the expansion beam includes an aluminum profile expansion beam 21.

[0057] The enclosure body and mounting components 22 can be independent sheet metal stamping structures. The enclosure body includes a sheet metal enclosure body 10, and the mounting components 22 include sheet metal mounting components. This improves the structural strength of the enclosure body and mounting components 22, reducing the risk of deformation or cracking. The sheet metal enclosure body 10 and mounting components 22 can be made of carbon steel, manganese steel, carbon-manganese steel, or bainitic high-strength steel, but are not limited to these materials. The sheet metal enclosure body 10 and mounting components 22 can be made of the same material; of course, they can also be made of different materials.

[0058] The mounting component 22 can be connected to the sheet metal box body 10 by welding. The welding process can be spot welding, arc welding, or laser welding, but is not limited to these.

[0059] In some embodiments, after the mounting component 22 is welded to the sheet metal box body 10, gaps may exist between the mounting component 22 and the sheet metal box body 10. Adhesive can be applied between the connecting surfaces of the mounting component 22 and the sheet metal box body 10 to form a continuous adhesive layer. This makes the connection between the mounting component 22 and the sheet metal box body 10 tighter and more stable, effectively enhancing the connection strength between them. Simultaneously, the adhesive layer has a certain degree of flexibility and elasticity, which can disperse the expansion force borne by the expansion beam, reducing the risk of weld cracking or fatigue failure due to stress concentration at the weld point. The adhesive applied between the connecting surfaces of the mounting component 22 and the sheet metal box body 10 can be epoxy resin, polyurethane resin, or phenolic resin, but is not limited to these.

[0060] In some embodiments, the sheet metal box body 10 may be part of the chassis structure of the vehicle 1000a. For example, a portion of the sheet metal box body 10 may be at least a part of the chassis of the vehicle 1000a, or a portion of the sheet metal box body 10 may be at least a part of the crossbeams and longitudinal beams of the vehicle 1000a.

[0061] In some embodiments, at least a portion of the sheet metal box body 10 may be disposed on the chassis structure of the vehicle 1000a.

[0062] The expansion beam includes aluminum profile expansion beam 21, which is an aluminum product made by extrusion process and has the characteristics of high strength, light weight, corrosion resistance and easy processing.

[0063] In some embodiments, a first cavity 21a is formed inside the aluminum profile expansion beam 21 so that the aluminum profile expansion beam 21 can absorb the expansion force generated by the battery cells during charging and discharging. The aluminum profile expansion beam 21 is supported on at least a portion of the mounting assembly 22, and the expansion force absorbed by the aluminum profile expansion beam 21 can be distributed to the sheet metal housing body 10 by the mounting assembly 22 to reduce the compressive force between two adjacent battery cells, thereby reducing the risk of short circuits in the battery cells and improving the reliability of the battery device 100a.

[0064] The extension direction of the aluminum profile expansion beam 21 is perpendicular to the expansion direction of the battery cell, and the surface of the aluminum profile expansion beam 21 facing the battery cell is flat, used to abut against the battery cell. Because the surface of the aluminum profile expansion beam 21 facing the battery cell is perpendicular to the expansion direction of the battery cell, the expansion force generated by the battery cell can be absorbed more directly by the aluminum profile expansion beam 21. Furthermore, after being absorbed, the expansion force is dispersed along the extension direction of the aluminum profile expansion beam 21, improving the diffusion efficiency of the expansion force and significantly reducing stress concentration.

[0065] In some embodiments, the aluminum profile expansion beam 21 can be detachably connected to the mounting assembly 22, allowing for individual replacement of the aluminum profile expansion beam 21 when it experiences wear, deformation, or cracks, without replacing the entire battery box 101. This not only reduces maintenance costs but also improves the replacement efficiency of the aluminum profile expansion beam 21. The detachable connection method can be bolted, screwed, riveted, or pin-connected, but is not limited to these methods.

[0066] In some embodiments, after the aluminum profile expansion beam 21 is detachably connected to the mounting assembly 22, adhesive can be applied between the connection surfaces of the aluminum profile expansion beam 21 and the mounting assembly 22 to form a continuous adhesive layer, thereby enhancing the connection strength between the aluminum profile expansion beam 21 and the mounting assembly 22 and reducing the risk of fatigue failure of the connection structure due to stress concentration on the connection structure between the aluminum profile expansion beam 21 and the mounting assembly 22.

[0067] By connecting the mounting assembly 22 to the sheet metal box body 10 and supporting the expansion beam on the mounting assembly 22, the flexibility in material selection for both the expansion beam and the mounting assembly 22 can be improved. The mounting assembly 22 can be made of the same sheet metal as the sheet metal box body 10, thereby enhancing the connection strength and stability between the mounting assembly 22 and the sheet metal box body 10. This, in turn, enhances the structural strength and stability of the expansion beam supported on the mounting assembly 22, allowing the use of aluminum profile expansion beam 21 as the expansion beam for the battery box body 101. The aluminum profile expansion beam 21 has the characteristics of high strength and light weight. Compared with the related technology of welding the steel expansion beam integrally to the box body, it can significantly reduce the weight of the expansion beam, thereby reducing the expansion... The inertial force generated by the beam during vibration or collision reduces the risk of fatigue damage or fracture of the expansion beam, thereby improving the reliability of the battery device 100a. On the other hand, by using the aluminum profile expansion beam 21 as the expansion beam of the battery box 101, the overall weight of the battery box 101 can be reduced. When the battery box 101 is used in the battery device 100a of the vehicle 1000a, the weight of the battery device 100a can reduce the impact of the vehicle 1000a's energy consumption and range. Thirdly, the mounting component 22 can act as an intermediate transmission component for the expansion force, which can diffuse the expansion force borne by the aluminum profile expansion beam 21 to a wider area of ​​the sheet metal box body 10, thereby reducing stress concentration and reducing the risk of deformation or cracking of the sheet metal box body 10.

[0068] In some embodiments, the expansion beam may also be made of high-strength and lightweight materials such as titanium alloy or composite materials, but is not limited thereto.

[0069] In some embodiments, please continue to refer to Figure 2 The expansion beam assembly 20 also includes a connector 23. The connector 23 connects the aluminum profile expansion beam 21, the mounting assembly 22 and the sheet metal box body 10, and is located on the side of the aluminum profile expansion beam 21 facing away from the battery cell.

[0070] The connector 23 can be connected to the aluminum profile expansion beam 21, the mounting component 22 and the sheet metal box body 10 by means of bolt connection, screw connection, rivet connection or pin connection, but is not limited to these.

[0071] By placing the connector 23 on the side of the aluminum profile expansion beam 21 facing away from the battery cell, on the one hand, the connector 23 can provide the aluminum profile expansion beam 21 with a supporting force opposite to the expansion force borne by the aluminum profile expansion beam 21. This not only improves the anti-tipping ability of the aluminum profile expansion beam 21, but also offsets part of the expansion force, which can alleviate stress concentration and weaken the expansion force transmitted to the sheet metal box body 10, thus significantly improving the reliability of the sheet metal box body 10. On the other hand, the connector 23 can distribute the expansion force borne by the aluminum profile expansion beam 21 to the mounting assembly 22 and the sheet metal box body 10, thereby providing multiple dispersion paths for the expansion force, reducing the impact of the expansion force on the aluminum profile expansion beam 21, and thus improving the reliability of the aluminum profile expansion beam 21.

[0072] In some embodiments, please refer to Figures 2 to 4 The connector 23 includes two connectors 23, one of which is located at one end of the aluminum profile expansion beam 21 along its extension direction, and the other of which is located at the other end of the aluminum profile expansion beam 21 along its extension direction.

[0073] The aluminum profile expansion beam 21 can extend from one corner area 14 of the sheet metal box body 10 to another adjacent corner area 14; or, the aluminum profile expansion beam 21 can also be located between two adjacent corner areas 14 and extend along the arrangement direction of the two adjacent corner areas 14. One of the two connectors 23 is located at one end of the aluminum profile expansion beam 21 near the adjacent corner area 14, and the other of the two connectors 23 is located at one end of the aluminum profile expansion beam 21 near the other adjacent corner area 14.

[0074] Because the connector 23 is located in the middle region of the aluminum profile expansion beam 21 along its extension direction, the diffusion of the expansion force borne by the aluminum profile expansion beam 21 along its extension direction is restricted, resulting in stress concentration in the middle region of the aluminum profile expansion beam 21. In one embodiment of this application, by placing one of the two connectors 23 at one end of the aluminum profile expansion beam 21 along its extension direction and the other at the other end, on the one hand, the diffusion of the expansion force borne by the aluminum profile expansion beam 21 along its extension direction is not restricted, which is beneficial for the rapid diffusion of the expansion force and reduces stress concentration; on the other hand, by placing the connectors 23 at both ends of the aluminum profile expansion beam 21 along its extension direction, the middle region of the aluminum profile expansion beam 21 on the side facing away from the battery cell is left open to form a continuous wiring channel, which can reduce the risk of wiring being forced to detour or be segmented due to obstruction by the connectors 23.

[0075] In some embodiments, please continue to refer to Figure 4The connector 23 includes a first connecting part 231 and a second connecting part 232 that are connected to each other. The first connecting part 231 is connected to the side of the aluminum profile expansion beam 21 facing away from the battery cell, and the second connecting part 232 is connected to the mounting assembly 22.

[0076] The second connecting part 232 is supported on the mounting assembly 22. The first connecting part 231 connects to one end of the second connecting part 232 near the aluminum profile expansion beam 21 and is connected to the aluminum profile expansion beam 21. The first connecting part 231 and the second connecting part 232 can be plate-shaped, and the plane where the first connecting part 231 is located intersects the plane where the second connecting part 232 is located, so that the cross-section of the connector 23 along the extension direction of the aluminum profile expansion beam 21 is triangular. This not only improves the fatigue resistance of the connector 23 and reduces the risk of deformation or cracking of the connector 23, but also further enhances the connection strength between the aluminum profile expansion beam 21 and the mounting assembly 22.

[0077] The surface of the first connecting part 231 facing the aluminum profile expansion beam 21 can be parallel to the area of ​​the aluminum profile expansion beam 21 used to connect the first connecting part 231, and the surface of the second connecting part 232 facing the mounting component 22 can be parallel to the area of ​​the mounting component 22 used to connect the second connecting part 232, so that the stress distribution of the connection surface between the first connecting part 231 and the aluminum profile expansion beam 21 and the connection surface between the second connecting part 232 and the mounting component 22 is uniform, so as to alleviate stress concentration, thereby enhancing the connection strength and reducing the risk of loosening or falling off of the connector 23.

[0078] The first connecting part 231 and the aluminum profile expansion beam 21, as well as the second connecting part 232 and the mounting assembly 22, can be fixed together by means of bolt connection, screw connection, rivet connection, pin connection or adhesive connection, but are not limited to these.

[0079] By connecting the first connecting portion 231 of the connector 23 to the side of the aluminum profile expansion beam 21 facing away from the battery cell, and connecting the second connecting portion 232 of the connector 23 to the mounting assembly 22, on the one hand, the side of the aluminum profile expansion beam 21 facing away from the battery cell can be supported on the mounting assembly 22. This not only improves the anti-tipping ability of the aluminum profile expansion beam 21, but also offsets part of the expansion force, thereby weakening the expansion force transmitted to the sheet metal box body 10 and improving the reliability of the sheet metal box body 10. On the other hand, the expansion force borne by the aluminum profile expansion beam 21 can not only be directly distributed to the mounting assembly 22, but also distributed to the mounting assembly 22 through the first connecting portion 231 and the second connecting portion 232, thereby providing multiple distribution paths for the expansion force, improving the release efficiency of the expansion force borne by the aluminum profile expansion beam 21, and thus reducing the impact of the expansion force on the aluminum profile expansion beam 21.

[0080] In some embodiments, please continue to refer to Figure 4 The connector 23 also includes a third connector 233 that connects the first connector 231 and the second connector 232, and the third connector 233 connects the sheet metal box body 10.

[0081] The third connecting part 233 can be connected to the edge of the first connecting part 231 and the second connecting part 232 along the extension direction of the aluminum profile expansion beam 21. For example, the third connecting part 233 can be connected to the side of the first connecting part 231 and the second connecting part 232 away from the other connecting member 23, which facilitates the connection of the third connecting part 233 to the sheet metal box body 10. The third connecting part 233 can be in the form of a triangular plate structure, which can improve the overall structural strength and stability of the connecting member 23.

[0082] The third connecting part 233 can be connected to the sheet metal box body 10 by means of bolt connection, screw connection, rivet connection, pin connection or adhesive connection, but is not limited to these.

[0083] By connecting the third connecting part 233 to the first connecting part 231 and the second connecting part 232, and connecting the sheet metal box body 10, the third connecting part 233 can not only provide support for the first connecting part 231 and the second connecting part 232, reducing the risk of deformation or breakage of the first connecting part 231 and the second connecting part 232, thereby improving the structural strength of the connector 23, but also directly disperse the expansion force borne by the aluminum profile expansion beam 21 to the sheet metal box body 10, thereby further improving the release efficiency of the expansion force and reducing the impact of the expansion force on the aluminum profile expansion beam 21 and the mounting components 22.

[0084] In some embodiments, the mounting assembly 22 is connected to the base plate 11 of the sheet metal box body 10, and the aluminum profile expansion beam 21 is supported on the side of the mounting assembly 22 facing away from the base plate 11.

[0085] Among them, the aluminum profile expansion beam 21 is supported along the direction of gravity on the side of the mounting component 22 facing away from the base plate 11.

[0086] As the load-bearing structure of the battery box 101, the base plate 11 has stronger resistance to pressure and deformation. By connecting the mounting component 22 to the base plate 11 of the sheet metal box body 10 and supporting the aluminum profile expansion beam 21 on the side of the mounting component 22 facing away from the base plate 11, not only can the structural strength of the mounting component 22 connected to the base plate 11 be enhanced, thereby enhancing the structural strength and stability of the aluminum profile expansion beam 21, but the base plate 11 can also better bear and disperse the expansion force, which can significantly reduce the risk of deformation or cracking of the sheet metal box body 10.

[0087] In some embodiments, please continue to refer to Figures 2 to 4The mounting assembly 22 includes two support bases 222 and a mounting body 221. The two support bases 222 are respectively located in two corner areas 14 of the sheet metal box body 10, which are opposite each other along the first direction XX. The mounting body 221 is connected to the same side of the two support bases 222. The connector 23 is connected to the side of the mounting body 221 facing away from the support bases 222. The support bases 222, the mounting body 221, and the aluminum profile expansion beam 21 are arranged sequentially along the second direction ZZ, and the aluminum profile expansion beam 21 and the connector 23 are arranged along the third direction YY. The first direction XX, the second direction ZZ, and the third direction YY are perpendicular to each other.

[0088] Both support bases 222 extend partially along the first direction XX towards each other, and the two support bases 222 are spaced apart along the first direction XX. The mounting body 221 is supported at both ends along the first direction XX on the side of the two support bases 222 facing away from the base plate 11, and the aluminum profile expansion beam 21 is supported on the side of the mounting body 221 facing away from the support bases 222, so that the support bases 222, the mounting body 221 and the aluminum profile expansion beam 21 are arranged sequentially along the second direction ZZ.

[0089] In some embodiments, the support base 222 and the mounting body 221 are separate structures, meaning that the support base 222 and the mounting body 221 are independent components, but are combined into one unit by a fixed connection. The fixed connection method can be welding, bolting, riveting, or pin connection, but is not limited to these. By configuring the support base 222 and the mounting body 221 as separate structures, stress distribution can be optimized, stress concentration can be alleviated, thereby extending the overall service life of the mounting assembly 22.

[0090] In some embodiments, the support base 222 and the mounting body 221 are integrally formed.

[0091] The second connecting portion 232 of the connector 23 is connected to the side of the mounting body 221 facing away from the support base 222 along the second direction ZZ. The first connecting portion 231 of the connector 23 is connected to the side of the aluminum profile expansion beam 21 facing away from the battery cell along the third direction YY, and the side of the aluminum profile expansion beam 21 facing away from the connector 23 along the third direction YY abuts against the battery cell.

[0092] The corner area 14 is prone to stress concentration due to its curved shape. On the one hand, by setting two support seats 222 respectively on the two corner areas 14 of the sheet metal box body 10 that are opposite each other along the first direction XX, not only can the structural strength of the corner area 14 be enhanced, but also the expansion force and stress of the corner area 14 can be dispersed to other areas of the sheet metal box body 10, thereby reducing the risk of deformation or cracking due to stress overload of the corner area 14 and improving the reliability of the battery box 101. On the other hand, by connecting the mounting body 221 to the same side of the two support seats 222 and setting the aluminum profile expansion beam 21 on the side of the mounting body 221 facing away from the support seats 222, the support seats 222 can provide support force for the aluminum profile expansion beam 21 and the two ends of the mounting body 221 along the first direction XX, and can guide the expansion force borne by the aluminum profile expansion beam 21 to diffuse towards both ends along the first direction XX, so as to reduce the impact of the expansion force on the middle area of ​​the aluminum profile expansion beam 21, thereby reducing the risk of cracking or deformation of the aluminum profile expansion beam 21.

[0093] In some embodiments, please refer to Figures 4 to 5 The mounting body 221 includes a first supporting portion 2211, two first transition portions 2212, and two first abutting portions 2213. The first supporting portion 2211 and the support base 222 are spaced apart along a second direction ZZ. The two first transition portions 2212 are connected to opposite ends of the first supporting portion 2211 along a third direction YY and extend toward the base plate 11. The first transition portions 2212 and the support base 222 are spaced apart along a third direction YY. One of the two first abutting portions 2213 is connected to the end of one first transition portion 2212 away from the first supporting portion 2211, and the other is connected to the end of the other first transition portion 2212 away from the first supporting portion 2211. The side of the first abutting portion 2213 facing away from the first transition portion 2212 is connected to the support base 222. The aluminum profile expansion beam 21 is supported on the first abutment portion 2213 near the battery cell, and extends partially to the side of the first bearing portion 2211 opposite to the support base 222, and is connected to the first bearing portion 2211.

[0094] The first support portion 2211 is located on the side of the mounting body 221 away from the base plate 11 along the second direction ZZ, and is spaced apart from the support base 222 along the second direction ZZ, so that a first gap 22a is formed between the first support portion 2211 and the support base 222. One of the two first transition portions 2212 is connected to the side of the first support portion 2211 close to the battery cell along the third direction YY, and the other is connected to the side of the first support portion 2211 away from the battery cell along the third direction YY. Both first transition portions 2212 are spaced apart from the support base 222 along the third direction YY, so that a second gap 22b is formed between both first transition portions 2212 and the support base 222. The first gap 22a between the first bearing portion 2211 and the support base 222 and the second gap 22b between the first transition portion 2212 and the support base 222 can not only absorb part of the expansion force, so as to quickly and evenly distribute the expansion force to the sheet metal box body 10, thereby relieving the impact of the expansion force on the expansion beam assembly 20, but also help dissipate heat and improve the heat dissipation efficiency of the expansion beam assembly 20.

[0095] In some embodiments, the first gap 22a and the second gap 22b can be connected to expand the overall volume and continuity of the gap, which can not only improve the gap's ability to absorb expansion force, but also improve the heat dissipation effect of the expansion beam assembly 20.

[0096] In some embodiments, a partition (not shown) is provided between the mounting body 221 and the support base 222. The partition may be located between the first gap 22a and the second gap 22b to separate the first gap 22a and the second gap 22b; alternatively, the partition may be located within the first gap 22a and / or the second gap 22b. The partition enhances the connection strength between the mounting body 221 and the support base 222, thereby increasing the deformation resistance of the mounting body 221 and reducing the risk of deformation or cracking of the mounting body 221 under the pressure of the aluminum profile expansion beam 21.

[0097] Each of the two first transition portions 2212 has a first abutment portion 2213 connected to its end away from the first support portion 2211. The first abutment portion 2213 closer to the battery cell extends along the third direction YY towards the battery cell, while the first abutment portion 2213 farther from the battery cell extends along the third direction YY towards the direction farther from the battery cell. The two first abutment portions 2213 can be located on the same plane in the second direction ZZ, allowing the first abutment portions 2213 to stably connect to the support base 222. This reduces the risk of displacement or shaking of the mounting body 221 due to imbalance on both sides along the third direction YY, improving the stability of the mounting body 221 and thus improving the stability of the aluminum profile expansion beam 21. The plane containing the first abutment portion 2213 can be parallel to the plane containing the first support portion 2211, allowing the aluminum profile expansion beam 21 to be stably supported on the first abutment portion 2213 and the first support portion 2211 closer to the battery cell.

[0098] In some embodiments, the first bearing portion 2211 and the first transition portion 2212, as well as the first transition portion 2212 and the first abutment portion 2213, can have a rounded chamfer structure, so that the connection between the first bearing portion 2211 and the first transition portion 2212, and the connection between the first transition portion 2212 and the first abutment portion 2213, can smoothly transition, which can alleviate stress concentration and reduce the risk of deformation or breakage at the connection. At the same time, it can also reduce or eliminate the sharp area of ​​the mounting body 221, thereby reducing the risk of wear of the aluminum profile expansion beam 21 due to interference between the sharp area of ​​the mounting body 221 and the aluminum profile expansion beam 21.

[0099] By arranging the first bearing portion 2211 and the support base 222 at intervals along the second direction ZZ, and arranging the second transition portion 2221b and the support base 222 at intervals along the third direction YY, a first gap 22a is formed between the first bearing portion 2211 and the support base 222, and a second gap 22b is formed between the first transition portion 2212 and the support base 222. On the one hand, the first gap 22a and the second gap 22b can absorb part of the expansion force, so as to quickly and evenly distribute the expansion force to the sheet metal box body 10, thereby alleviating the impact of the expansion force on the expansion beam assembly 20. On the other hand, the first gap 22a and the second gap 22b both extend along the first direction XX, which can form a natural air convection channel, which helps the heat dissipation of the battery cell, thereby improving the heat dissipation efficiency of the battery cell. Thirdly, the first gap 22a and the second gap 22b can be used to contain gas. When the mounting assembly 22 is subjected to external impact or vibration, the gas in the gap will be compressed, thereby playing a buffering and shock absorption role, which can enhance the structural strength and stability of the expansion beam assembly 20.

[0100] In some embodiments, please refer to Figures 4 to 5 The aluminum profile expansion beam 21 includes a beam body 211 and a fixing part 212. The beam body 211 is supported by a first abutment part 2213. The fixing part 212 is located on the side of the beam body 211 facing away from the battery cell and extends to the side of the first bearing part 2211 facing away from the support base 222, and is connected to the first bearing part 2211.

[0101] The beam body 211 serves as the main structure of the aluminum profile expansion beam 21. A first cavity 21a is formed inside the beam body 211 to allow the beam body 211 to absorb the expansion force generated during the charging and discharging of the battery cells. The fixing part 212 serves as the fixing structure of the aluminum profile expansion beam 21 and is used to fix the aluminum profile expansion beam 21 to the mounting assembly 22.

[0102] The plane where the fixing part 212 is located can be parallel to the plane where the first bearing part 2211 is located, so that the stress distribution on the connection surface between the fixing part 212 and the first bearing part 2211 is uniform, thereby alleviating stress concentration and enhancing the connection strength between the fixing part 212 and the first bearing part 2211. This, in turn, enhances the connection strength between the aluminum profile expansion beam 21 and the mounting assembly 22, reducing the risk of loosening or shaking of the aluminum profile expansion beam 21. One end of the beam body 211 facing the first abutment 2213 along the second direction ZZ can be connected to the first abutment 2213 to further enhance the connection strength between the aluminum profile expansion beam 21 and the mounting assembly 22. The connection method between the beam body 211 and the first abutment 2213 can be bolt connection, riveting connection, pin connection, or adhesive connection, but is not limited to these.

[0103] In some embodiments, the beam body 211 and the fixing part 212 can be an integrally formed structure; or, the beam body 211 and the fixing part 212 can be two independent components, and the beam body 211 and the fixing part 212 are fixed together by welding, bolt connection, riveting connection or other means.

[0104] By providing a fixing part 212 on the side of the beam body 211 facing away from the battery cell, the beam body 211 is fixed to the mounting body 221 through the fixing part 212. This not only improves the positioning and installation speed of the beam body 211, but also improves the connection strength and stability between the aluminum profile expansion beam 21 and the mounting assembly 22.

[0105] In some embodiments, the fixing part 212 is provided with a first fixing hole 212a, and the first supporting part 2211 is provided with a second fixing hole (not shown) that is adapted to the first fixing hole 212a. The first fixing hole 212a and the second fixing hole are used to cooperate with a fastener (not shown) to fix the fixing part 212 to the first supporting part 2211.

[0106] The aluminum profile expansion beam 21 may include multiple fixing parts 212, which are arranged sequentially at intervals along a first direction XX. Each fixing part 212 is provided with at least one first fixing hole 212a. Alternatively, the aluminum profile expansion beam 21 may include only one fixing part 212, which extends along the first direction XX and is provided with multiple first fixing holes 212a, which are arranged sequentially at intervals along the first direction XX. The number of first fixing holes 212a is equal to the number of second fixing holes, and the number of both can be two, three, five, six, eight, etc., but is not limited to these.

[0107] The fastener can be inserted into the first fixing hole 212a and the second fixing hole to fix the fixing part 212 to the first bearing part 2211. The fastener can be a bolt, screw, rivet or pin, etc., but is not limited to these.

[0108] By fixing the fixing part 212 to the first bearing part 2211 with the fastener, the aluminum profile expansion beam 21 can be detachably connected to the mounting assembly 22. This allows the aluminum profile expansion beam 21 to be replaced separately when it suffers wear, deformation or cracks, without having to replace the entire battery box 101. This not only improves the replacement efficiency of the aluminum profile expansion beam 21, but also reduces maintenance costs.

[0109] In some embodiments, when the expansion beam assembly 20 includes two connectors 23, the fixing part 212 can be disposed between the two connectors 23 and spaced apart from the connectors 23. This not only further enhances the connection strength between the aluminum profile expansion beam 21 and the mounting assembly 22, but also reduces the impact of the central region of the aluminum profile expansion beam 21 on the wiring on the side facing away from the battery cell, as the fixing part 212 has a smaller size along the second direction ZZ.

[0110] In some embodiments, the sheet metal box body 10 includes two first side plates 12 disposed opposite to each other along a first direction XX. The two first side plates 12 are connected to the outer edge of the bottom plate 11 to form a receiving space 10a. The support base 222 includes a support body 2221, a connecting portion 2222, and an extension portion 2223. The support body 2221 extends along the first direction XX and is used to support the mounting body 221. The connecting portion 2222 is connected to the end of the support body 2221 near the first side plate 12 adjacent to the corner area 14, and is bent toward the corner area 14. The extension portion 2223 is connected to the end of the connecting portion 2222 away from the support body 2221, and extends along a third direction YY.

[0111] Two first side plates 12 are connected to the outer edges of the base plate 11 along a first direction XX. The sheet metal box body 10 also includes two second side plates 13 arranged opposite each other along a third direction YY. The two second side plates 13 are connected to the outer edges of the base plate 11 along a third direction YY. The two first side plates 12 and the two second side plates 13 are correspondingly connected, and a corner area 14 is formed between each first side plate 12 and each second side plate 13. The corner area 14 has a rounded chamfer structure.

[0112] In some embodiments, the battery housing 101 includes two expansion beam assemblies 20, one of which is disposed between a second side plate 13 and a battery cell, and the other of which is disposed between another second side plate 13 and a battery cell.

[0113] The support base 222 includes a support body 2221, a connecting part 2222, and an extension part 2223 connected in sequence. The support body 2221 and the extension part 2223 extend in a straight line in a general manner, and the connecting part 2222 is arc-shaped to adapt to the changes in the corner area 14 of the sheet metal box body 10.

[0114] By configuring the support body 2221, which supports the mounting body 221, to extend along the first direction XX, the contact area between the mounting body 221 and the support body 2221 is increased, thereby improving the connection strength and stability between the mounting body 221 and the support body 2221, and thus improving the structural strength and stability of the aluminum profile expansion beam 21. By providing a connecting part 2222 between the support body 2221 and the extension 2223, it can not only adapt to the changes in the corner area 14 of the sheet metal box body 10, but also alleviate the transition from the mounting body 221 to the extension. The deformation of part 2223 allows the expansion force to be evenly distributed from the mounting body 221 to the extension part 2223, which can reduce the risk of deformation or cracking of the support 222 due to stress concentration. By providing the extension part 2223 at the end of the connection part 2222 away from the mounting body 221, the expansion force can be distributed to the area away from the aluminum profile expansion beam 21 through the extension part 2223, thereby reducing the concentration of expansion force near the aluminum profile expansion beam 21 and reducing the risk of deformation or cracking of the aluminum profile expansion beam 21 and the area of ​​the sheet metal box body 10 near the aluminum profile expansion beam 21.

[0115] In some embodiments, please continue to refer to Figure 5The support body 2221 includes a second bearing portion 2221a, two second transition portions 2221b, and two second abutment portions 2221c. The second bearing portion 2221a is positioned opposite and spaced apart from the first bearing portion 2211 and the base plate 11 along a second direction ZZ. The two second transition portions 2221b are connected to opposite ends of the second bearing portion 2221a along a third direction YY and extend toward the base plate 11. One of the two second abutment portions 2221c is connected to the end of a second transition portion 2221b away from the second bearing portion 2221a, and the other is connected to the end of another second transition portion 2221b away from the second bearing portion 2221a. The second abutment portion 2221c is connected to the base plate 11 and abuts against the first abutment portion 2213 on its side facing away from the base plate 11.

[0116] The first gap 22a is formed between the first support portion 2211 and the second support portion 2221a. The second gap 22b is formed between the second transition portion 2221b and the first transition portion 2212.

[0117] By arranging the second bearing portion 2221a and the base plate 11 at intervals along the second direction ZZ, two second transition portions 2221b are connected to the opposite ends of the second bearing portion 2221a along the third direction YY and extend toward the base plate 11 to form a second cavity 22c. The second cavity 22c can absorb the expansion force together with the first gap 22a and the second gap 22b, which can further improve the diffusion efficiency and effect of the expansion force. At the same time, the formation of the second cavity 22c can also further improve the heat dissipation efficiency and the buffering and shock absorption effect.

[0118] Each of the two second transition portions 2221b is connected to a second abutment portion 2221c at its end away from the second support portion 2221a. The second abutment portion 2221c closer to the battery cell extends along the third direction YY towards the battery cell, while the second abutment portion 2221c farther from the battery cell extends along the third direction YY towards the direction away from the battery cell. The two second abutment portions 2221c can be located on the same plane in the second direction ZZ, allowing the second abutment portions 2221c to stably connect to the base plate 11. This reduces the risk of displacement or swaying of the support base 222 due to imbalance on both sides along the third direction YY, improving the stability of the support base 222, and thus improving the stability of the mounting body 221 and the aluminum profile expansion beam 21.

[0119] In some embodiments, the second support portion 2221a and the second transition portion 2221b, as well as the second transition portion 2221b and the second abutment portion 2221c, can have a rounded chamfer structure, so that the connection between the second support portion 2221a and the second transition portion 2221b, and the connection between the second transition portion 2221b and the second abutment portion 2221c, can smoothly transition, which can alleviate stress concentration and reduce the risk of deformation or breakage at the connection; at the same time, it can also reduce or eliminate the sharp area of ​​the support 222.

[0120] In some embodiments, please refer to Figure 3 The extension 2223 includes a first part 2223a and a second part 2223b that are connected to each other. The first part 2223a is connected to the base plate 11, and the second part 2223b is connected to the first side plate 12.

[0121] The first part 2223a can distribute the expansion force to the base plate 11, and the second part 2223b can distribute the expansion force to the first side plate 12. This achieves the simultaneous distribution of the expansion force to multiple structures of the sheet metal box body 10, reducing the risk of deformation or cracking of the structure due to the concentrated distribution of expansion force on a single structure, and improving the reliability of the battery box 101.

[0122] This application further proposes an expansion beam assembly 20, the structure of which can be referred to the expansion beam assembly 20 in the above embodiments, and the expansion beam assembly 20 can be used in the battery box 101 of the battery device 100a.

[0123] This application further proposes a battery housing 101, which includes a sheet metal housing body 10 and an expansion beam assembly 20 as described in the above embodiments. The battery housing 101 can be used in a battery device 100a.

[0124] According to some embodiments of this application, the battery device 100a described above can be used in electrical equipment. This configuration, by connecting the mounting assembly 22 to the sheet metal housing body 10 and supporting the expansion beam on the mounting assembly 22, improves the flexibility in material selection for both the expansion beam and the mounting assembly 22. The mounting assembly 22 can be made of the same material as the sheet metal housing body 10, enhancing the connection strength and stability between the mounting assembly 22 and the sheet metal housing body 10. This, in turn, enhances the structural strength and stability of the expansion beam supported on the mounting assembly 22, allowing the use of an aluminum profile expansion beam 21 as the expansion beam of the battery housing 101. The aluminum profile expansion beam 21 possesses high strength and lightweight characteristics. Compared to related technologies that weld a steel expansion beam integrally to the housing body, this significantly reduces the weight of the expansion beam, thereby reducing... The inertial force generated by the expansion beam during vibration or collision reduces the risk of fatigue damage or breakage, thereby improving the reliability of the battery device 100a. On the other hand, by using the aluminum profile expansion beam 21 as the expansion beam of the battery box 101, the overall weight of the battery box 101 can be reduced. When the battery box 101 is used in the battery device 100a of the vehicle 1000a, the weight of the battery device 100a can reduce the impact on the energy consumption and range of the vehicle 1000a. Thirdly, the mounting component 22 can act as an intermediate transmission component for the expansion force, which can diffuse the expansion force borne by the aluminum profile expansion beam 21 to a wider area of ​​the sheet metal box body 10, thereby reducing stress concentration and reducing the risk of deformation or cracking of the sheet metal box body 10.

[0125] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device includes a battery cell and a battery housing, wherein the battery housing includes at least: The box body has a receiving space for accommodating the battery cell; An expansion beam assembly is disposed within the accommodating space. The expansion beam assembly includes an expansion beam and a mounting assembly. The mounting assembly is connected to the housing body. The expansion beam is supported on at least a portion of the mounting assembly and abuts against the battery cell. The box body includes a sheet metal box body, and the expansion beam includes an aluminum profile expansion beam.

2. The battery device according to claim 1, characterized by The expansion beam assembly also includes a connector that connects the aluminum profile expansion beam, the mounting assembly, and the sheet metal box body, and is located on the side of the aluminum profile expansion beam facing away from the battery cell.

3. The battery device of claim 2, wherein, The expansion beam assembly includes two connectors, one of which is located at one end of the aluminum profile expansion beam along its extension direction, and the other of which is located at the other end of the aluminum profile expansion beam along the extension direction.

4. The battery device according to claim 2 or 3, characterized by The connector includes a first connecting part and a second connecting part that are connected to each other. The first connecting part is connected to the side of the aluminum profile expansion beam facing away from the battery cell, and the second connecting part is connected to the mounting assembly.

5. The battery device of claim 4, wherein, The connector further includes a third connecting part that connects the first connecting part and the second connecting part, and the third connecting part connects to the sheet metal box body.

6. The battery device of claim 2, wherein The mounting assembly is connected to the base plate of the sheet metal box body, and the aluminum profile expansion beam is supported on the side of the mounting assembly facing away from the base plate.

7. The battery device of claim 6, wherein The installation components include: Two support bases are respectively located at two corner areas of the sheet metal box body that are opposite each other along the first direction; The mounting body is connected to the same side of the two support bases, and the connector is connected to the side of the mounting body facing away from the support bases; The support base, the mounting body, and the aluminum profile expansion beam are arranged sequentially along the second direction, and the aluminum profile expansion beam and the connector are arranged along the third direction, with the first direction, the second direction, and the third direction being perpendicular to each other.

8. The battery device according to claim 7, characterized in that, The installation body includes: The first bearing portion is spaced apart from the support base along the second direction; Two first transition portions are connected to opposite ends of the first bearing portion along the third direction and extend toward the base plate. The first transition portions and the support base are spaced apart along the third direction. Two first abutting portions, one of which is connected to one end of a first transition portion away from the first bearing portion, and the other is connected to one end of another first transition portion away from the first bearing portion. The side of the first abutting portion facing away from the first transition portion is connected to the support seat. The aluminum profile expansion beam is supported on the first abutment near the battery cell, and extends partially to the side of the first bearing portion opposite to the support base, and is connected to the first bearing portion.

9. The battery device of claim 8, wherein, The aluminum profile expansion beam includes: The main beam is supported by the first abutment part; The fixing part is located on the side of the beam body facing away from the battery cell, and extends to the side of the first bearing part facing away from the support base, and is connected to the first bearing part.

10. The battery device according to claim 8 or 9, characterized by The sheet metal box body includes two first side plates arranged opposite to each other along the first direction, the two first side plates being connected to the outer edge of the bottom plate to form the receiving space; the support base includes: A support body extends along the first direction and is used to support the mounting body; The connecting part is connected to one end of the support body near the first side plate adjacent to the corner area, and is bent toward the corner area; An extension is connected to the end of the connecting portion away from the support body and extends along the third direction.

11. The battery device of claim 10, wherein, The supporting structure includes: The second support portion is disposed opposite to and spaced apart from the first support portion and the base plate along the second direction; Two second transition portions are connected to opposite ends of the second bearing portion along the third direction and extend toward the base plate; Two second abutting portions, one of which is connected to one end of a second transition portion away from the second bearing portion, and the other is connected to one end of another second transition portion away from the second bearing portion. The second abutting portion is connected to the base plate and abuts against the first abutting portion on the side facing away from the base plate.

12. The battery device of claim 10, wherein, The extension includes a first part and a second part that are connected to each other, the first part being connected to the base plate and the second part being connected to the first side plate.

13. An expanding beam assembly characterized by, The expansion beam assembly includes: Expansion beam; Mounting assembly for connecting the sheet metal box body of the battery box, the expansion beam being supported on at least a portion of the mounting assembly and for abutting against the battery cell; The expansion beam includes an aluminum profile expansion beam.

14. The expansion beam assembly according to claim 13, characterized in that, The expansion beam assembly also includes a connector for connecting the aluminum profile expansion beam, the mounting assembly, and the sheet metal box body, and is located on the side of the aluminum profile expansion beam facing away from the battery cell.

15. The expansion beam assembly according to claim 14, characterized in that, The expansion beam assembly includes two connectors, one of which is located at one end of the aluminum profile expansion beam along its extension direction, and the other of which is located at the other end of the aluminum profile expansion beam along the extension direction.

16. The expansion beam assembly according to claim 14 or 15, characterized in that, The connector includes a first connecting part and a second connecting part that are connected to each other. The first connecting part is connected to the side of the aluminum profile expansion beam facing away from the battery cell, and the second connecting part is connected to the mounting assembly.

17. The expansion beam assembly according to claim 16, characterized in that, The connector further includes a third connecting part that connects the first connecting part and the second connecting part, and the third connecting part is used to connect the sheet metal box body.

18. The expansion beam assembly according to claim 14, characterized in that, The mounting assembly is used to connect the bottom plate of the sheet metal box body, and the aluminum profile expansion beam is supported on the side of the mounting assembly facing away from the bottom plate.

19. The expansion beam assembly according to claim 18, characterized in that, The installation components include: Two support bases are respectively provided in two corner areas of the sheet metal box body that are arranged opposite to each other along the first direction; The mounting body is connected to the same side of the two support bases, and the connector is connected to the side of the mounting body facing away from the support bases; The support base, the mounting body, and the aluminum profile expansion beam are arranged sequentially along the second direction, and the aluminum profile expansion beam and the connector are arranged along the third direction, with the first direction, the second direction, and the third direction being perpendicular to each other.

20. The expansion beam assembly according to claim 19, characterized in that, The installation body includes: The first bearing portion is spaced apart from the support base along the second direction; Two first transition portions are provided for relative connection to opposite ends of the first bearing portion along the third direction and extending toward the base plate. The first transition portions and the support base are spaced apart along the third direction. Two first abutting portions, one of which is connected to one end of a first transition portion away from the first bearing portion, and the other is connected to one end of another first transition portion away from the first bearing portion. The side of the first abutting portion facing away from the first transition portion is connected to the support seat. The aluminum profile expansion beam is supported on the first abutment portion for proximity to the battery cell, and extends partially to the side of the first bearing portion opposite to the support base, and is connected to the first bearing portion.

21. The expansion beam assembly according to claim 20, characterized in that, The support base includes: A support body extends along the first direction and is used to support the mounting body; The connecting part is connected to one end of the support body for approaching the first side plate adjacent to the corner area of ​​the sheet metal box body, and is bent toward the corner area; An extension is connected to the end of the connecting portion away from the support body and extends along the third direction.

22. The expansion beam assembly according to claim 21, characterized in that, The supporting structure includes: The second support portion is disposed opposite to and spaced apart from the first support portion and the base plate along the second direction; Two second transition portions are connected to opposite ends of the second bearing portion along the third direction and extend toward the base plate; Two second abutting portions, one of which is connected to one end of a second transition portion away from the second bearing portion, and the other is connected to one end of another second transition portion away from the second bearing portion. The second abutting portion is connected to the base plate and abuts against the first abutting portion on the side facing away from the base plate.

23. A battery housing, characterized in that, The battery housing includes: Sheet metal box body; and The expansion beam assembly as described in any one of claims 13 to 22.

24. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 12.

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