Battery device and electric appliance

Abstract

This application relates to a battery device and an electrical device, and pertains to the field of battery technology. The battery device is installed in the electrical device and supplies power to it. The battery device includes a battery cell pack and a housing. The battery cell pack includes multiple battery cells stacked along a first direction. The housing includes a receiving cavity for accommodating the battery cell pack, and a beam extending along a second direction perpendicular to the first direction is disposed within the receiving cavity. The beam abuts against the battery cell pack along the first direction. The housing includes a mounting portion located at at least one end of the beam along the second direction and connected to the beam. The housing includes a frame layer and a skin layer, the skin layer covering the frame layer. The frame layer includes a beam frame forming the beam and a mounting portion frame forming the mounting portion, the beam frame being connected to the mounting portion frame. This battery device can meet its own lightweight design requirements while ensuring the housing has good structural strength and deformation resistance.

Description

Technical Field

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

[0002] Battery cells are typically installed and secured using enclosures. Currently, enclosures are mainly divided into two categories: metal enclosures and composite material enclosures. However, metal materials have a high density, making it difficult to meet their own lightweight design requirements; while composite materials offer weight reduction advantages, their low stiffness results in insufficient structural strength and deformation resistance of the enclosure.

[0003] Therefore, it is necessary to provide a battery device and electrical equipment that, while meeting their own lightweight design requirements, ensure that the enclosure has good structural strength and resistance to deformation. Utility Model Content

[0004] Based on this, this application provides a battery device and an electrical appliance that can meet its own lightweight design requirements while ensuring that the housing has good structural strength and resistance to deformation.

[0005] In a first aspect, this application provides a battery device installed in an electrical appliance and supplying power to the appliance. The battery device includes a battery cell pack and a housing. The battery cell pack includes a plurality of battery cells stacked along a first direction, which is the thickness direction of the battery cells. The housing includes a receiving cavity for receiving the battery cell pack, and a beam extending along a second direction perpendicular to the first direction is disposed within the receiving cavity. The beam abuts against the battery cell pack along the first direction. The housing also includes a mounting portion located at at least one end of the beam along the second direction and connected to the beam. The housing further includes a frame layer and a skin layer, the skin layer covering the frame layer. The frame layer includes a beam frame forming the beam and a mounting portion frame forming the mounting portion, the beam frame being connected to the mounting portion frame.

[0006] In the technical solution provided in this application embodiment, when a battery cell is placed in the housing, the second direction is parallel or approximately parallel to the large surface of the battery cell, which allows the expansion force to be converted into compressive stress on the beam. The mounting part is located at the end of the beam in the second direction, and the beam extends to the mounting part, providing a reliable support point for the beam. This design optimizes the load transfer path, avoids the diversion and dissipation of force to non-load-bearing structures (such as the sidewalls of the housing) during the transmission process, and ensures that loads such as the expansion force of the battery cell and the external extrusion force are efficiently and relatively completely transferred to the fuselage, significantly improving the structural strength and deformation resistance of the housing. The housings provided in some embodiments of this specification significantly improve structural strength and deformation resistance through structural design, greatly reducing the dependence on the selection of housing materials. Even when using lightweight composite materials with lower stiffness than metal materials, the housing can still have good structural strength and deformation resistance, achieving an excellent balance between lightweight and high strength.

[0007] By covering the skeleton layer with a skin layer and directly connecting the beam skeleton with the mounting frame, an integrated load-bearing structure of the beam and the mounting frame is formed, thus optimizing the force transmission path.

[0008] In some embodiments, the beam frame and the mounting frame are integrally connected.

[0009] In the technical solution provided in this application embodiment, the beam frame and the mounting frame are integrally connected without the need for additional connection processes, thereby eliminating the connection interface, improving structural strength and rigidity, reducing the number of parts, and simplifying the assembly process.

[0010] In some embodiments, the box body includes an outer perimeter plate, the outer perimeter plates being joined end to end to form a receiving cavity, the outer perimeter plate including two first outer perimeter plates disposed opposite each other along a second direction, at least one end of the beam frame protruding from the first outer perimeter plate along the second direction, and the portion of the beam frame protruding from the first outer perimeter plate forming a mounting frame.

[0011] In the technical solution provided in this application embodiment, by directly extending the end of the beam frame and protruding the first outer plate to form the mounting frame, the integrated structure of the beam and the mounting part is realized. There is no need to set up additional mounting brackets, which shortens the force transmission path and avoids stress concentration and failure risk of the connecting parts. This improves the overall rigidity, torsional resistance and connection reliability of the box, while simplifying the assembly process and contributing to weight reduction.

[0012] In some embodiments, the box body includes an outer perimeter plate, which are connected end to end to form a receiving cavity. The outer perimeter plate includes two first outer perimeter plates arranged opposite each other along a second direction. At least one end of the beam body along the second direction is provided with a recess between the first outer perimeter plate and the beam body frame. The beam body frame is provided with a connecting rib frame corresponding to the recess, and the connecting rib frame is integrally connected with the mounting part frame.

[0013] In the technical solution provided in this application embodiment, by setting a recess between the end of the beam and the first outer plate, and using the connecting rib skeleton to realize the integral connection between the beam skeleton and the mounting skeleton, it is possible to effectively avoid surrounding components or reserve operating space, while forming a continuous force transmission path, avoiding stress concentration, improving the structural strength and fatigue resistance of the box, and contributing to lightweight design.

[0014] In some embodiments, the housing includes an outer perimeter plate, which are joined end to end to form a receiving cavity. The outer perimeter plate includes two second outer perimeter plates disposed opposite each other along a first direction. The second outer perimeter plate is formed on the side of the beam frame away from the battery cell pack.

[0015] In the technical solution provided in this application embodiment, by directly using the side of the beam frame away from the battery cell pack as the second outer perimeter plate, the functions of the beam and the other outer perimeter plates are integrated. There is no need to set up an additional outer perimeter plate that is set opposite to the first direction, which reduces the number of parts and assembly steps and is conducive to weight reduction. At the same time, the beam frame and the other outer perimeter plates form an integrated structure, so that the load can be directly transferred to the other outer perimeter plates of the box through the beam, shortening the force transmission path and improving the overall structural rigidity and impact resistance.

[0016] In some embodiments, the skin layer includes an outer skin facing away from the receiving cavity, the outer skin integrally covering at least a portion of the surface of the beam frame and at least a portion of the surface of the mounting frame.

[0017] In the technical solution provided in this application embodiment, the outer skin is integrally covered with at least part of the surface of the beam frame and the mounting frame to form a continuous outer protective layer, which can effectively isolate external moisture, dust and corrosive media, and protect the internal frame; at the same time, it connects the frames into a whole, improving the overall rigidity and impact resistance of the box.

[0018] In some embodiments, the skin layer further includes an inner skin facing the receiving cavity, the inner skin integrally covering at least a portion of the surface of the beam frame and at least a portion of the surface of the mounting frame, and the inner skin and the outer skin being interconnected.

[0019] In the technical solution provided in this application embodiment, the inner skin is integrally covered with at least a portion of the surface of the beam frame and the mounting frame, and is interconnected with the outer skin to form a double-sided sandwich structure, completely encasing the beam frame and the mounting frame within the skin layer. This structure significantly improves the box girder's bending and torsional stiffness and fatigue resistance, enabling the skin and frame to work together to bear load, avoiding localized stress concentration, and enhancing the overall structural integrity and reliability.

[0020] In some embodiments, the mounting portion is provided with a mounting connector, which includes a connecting portion and an extension portion connected to the connecting portion; the connecting portion is used to connect with electrical equipment, and the extension portion is fixedly connected to the outer surface of the mounting portion.

[0021] In the technical solution provided in this application embodiment, by using the connecting part to connect with electrical equipment and fixing the extension part to the outer surface of the mounting part, the stable installation of the mounting connector can be achieved.

[0022] In some embodiments, the connecting portion includes a through section and an exposed section, the through section passing through at least a portion of the mounting portion, the exposed section exposing the surface of the mounting portion, and the exposed section being connected to the extension portion.

[0023] In the technical solution provided in this application embodiment, by setting at least a through section that passes through the mounting part and using the exposed section to fix the extension part, the bonding strength between the mounting connector and the mounting part is effectively enhanced. External loads can be distributed and transferred from the connection part to the mounting part through the through section and the extension part, avoiding stress concentration and improving connection reliability and tensile and torsional performance.

[0024] In some embodiments, the extension includes a flange portion connected to the exposed section and a bend portion connected to the flange portion. The flange portion forms a first connecting surface connected to the mounting portion, and the bend portion forms a second connecting surface connected to the mounting portion. The first connecting surface and the second connecting surface are intersecting.

[0025] In the technical solution provided in this application embodiment, by setting a bending part, the fixing (such as bonding) area between the mounting connector and the mounting part can be effectively increased, thereby realizing the stable installation of the mounting connector and effectively improving the connection reliability and structural strength.

[0026] In some embodiments, the through section includes a sleeve extending along a third direction, which is perpendicular to the first and second directions.

[0027] In the technical solution provided in this application embodiment, the through section adopts a sleeve structure extending along a third direction, which can increase the contact area with the mounting part, so that the pull-out force is evenly distributed along the entire length of the sleeve inside the mounting part, avoiding local crushing; at the same time, the sleeve provides precise guidance and positioning for the fastener, which is convenient for assembly and effectively transmits multi-directional loads, avoids local stress concentration, and enhances the overall reliability and durability of the mounting connector.

[0028] In some embodiments, the mounting portion is provided with a through hole, and the mounting portion includes a first surface and a second surface spaced apart along a third direction, and a third surface located between the first surface and the second surface; the first surface and the second surface are connected through the through hole; the flange portion is fixedly connected to the first surface or the second surface of the mounting portion, and the bent portion is fixedly connected to the third surface of the mounting portion.

[0029] In the technical solution provided in this application embodiment, by fixing the flange part to the first or second surface of the mounting part, and fixing the bent part to the third surface of the mounting part, a reliable fixed connection between the extension part and the outer surface of the mounting part in multiple directions and regions is achieved, which effectively improves the stability of the connection structure and increases the load-bearing limit.

[0030] In some embodiments, the mounting connector includes a first mounting connector and a second mounting connector. The first mounting connector and the second mounting connector are disposed opposite each other on the same mounting part along a third direction, and the third direction is perpendicular to the first direction and the second direction.

[0031] In the technical solution provided in this application embodiment, a first mounting connector and a second mounting connector are arranged opposite each other along a third direction on the same mounting part to form a bidirectional symmetrical support structure, which can effectively balance the loads from different directions, avoid the eccentric load and overturning moment caused by unilateral force, and improve the torsional resistance and connection stability of the mounting point.

[0032] In some embodiments, the first mounting connector includes a first sleeve portion that passes through a through hole, and the second mounting connector includes a second sleeve portion that passes through a through hole, with the first sleeve portion abutting against the second sleeve portion.

[0033] In the technical solution provided in this application embodiment, the first sleeve portion and the second sleeve portion abut against each other. When connected to the machine body by bolts, the force of the bolts is transmitted through the first sleeve portion and the second sleeve portion, thereby effectively avoiding the risk of twisting after long-term use. When the first mounting connector and the second mounting connector are metal bushings, the risk of twisting after long-term use can be further reduced.

[0034] Secondly, this application provides an electrical device, which includes a battery device as described above, the battery device serving as the power source for the electrical device and / or the energy storage unit for the electrical device. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 These are schematic diagrams of the vehicle structure shown in some embodiments of this specification;

[0037] Figure 2 This is an exploded structural diagram of a battery device according to some embodiments of this specification;

[0038] Figure 3 This is an exploded structural diagram of a battery device (excluding the upper casing) according to other embodiments shown in this specification;

[0039] Figure 4 This is an exploded structural diagram of the housing according to some embodiments of this specification;

[0040] Figure 5 This is a top view of the housing structure according to some embodiments shown in this specification;

[0041] Figure 6 yes Figure 5 A cross-sectional view of the M region of the middle box along the AA direction;

[0042] Figure 7 This is a side view structural diagram of the housing according to some embodiments of this specification;

[0043] Figure 8 yes Figure 7 A cross-sectional view of the N region of the middle housing along the BB direction;

[0044] Figure 9 This is a structural schematic diagram of the mounting connector shown in some embodiments of this specification;

[0045] Figure 10 This is a structural schematic diagram of the mounting connector according to some embodiments of this specification.

[0046] The reference numerals in the detailed embodiments are as follows: 1. Vehicle; 10. Battery device; 30. Controller; 40. Motor; 100. Battery cell pack; 110. Battery cell; 111. Large surface; 20. Housing; 211. Upper housing; 212. Lower housing; 22. Receiving cavity; 23. Beam; 231. First supporting rib; 232. Second supporting rib; 233. Beam wall; 234. Connecting rib; 24. Mounting part; 241. Through hole; 242. Outer surface; 25. Skin layer; 251, Inner skin; 252, Outer skin; 26, Frame layer; 261, Beam frame; 262, Mounting frame; 263, Connecting rib frame; 27, Mounting connector; 271, First mounting connector; 272, Second mounting connector; 273, Connecting part; 274, Extension part; 2741, Flange part; 2742, Bending part; 28, Outer plate; 281, First outer plate; 282, Second outer plate; 283, Recessed part; 29, Base plate. Detailed Implementation

[0047] 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.

[0048] 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.

[0049] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, "multiple groups" means two or more, and "each" means each of the multiple, unless otherwise explicitly defined.

[0050] 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.

[0051] 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.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] With the development of new energy technologies, batteries are being used more and more widely, not only in energy storage power systems such as hydropower, thermal power, wind power and solar power plants, but also in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in military equipment and aerospace and other fields.

[0054] To meet the demand for long driving range, multiple battery cells are typically connected in series, parallel, or a combination thereof to increase battery capacity or power. The installation or securing of multiple battery cells generally requires a casing. Furthermore, during charging and discharging, battery cells expand due to factors such as the insertion or extraction of ions from the positive and negative electrode active materials, the thickness of side reaction accumulation in the battery cell system, and the peeling of graphite layers. This expansion causes deformation of the casing structure, affecting the battery's sealing performance. Therefore, related technologies typically incorporate beams within the casing to limit the expansion of the battery cells.

[0055] Enclosures can be mainly divided into two categories: metal enclosures and composite material enclosures. However, metal materials have a high density, making it difficult to meet their own lightweight design requirements; while composite materials have the advantage of weight reduction, their low stiffness results in insufficient structural strength and resistance to deformation of the enclosure.

[0056] To address the aforementioned issues, this application provides an apparatus. The battery device is installed in an electrical appliance and supplies power to the appliance. The battery device includes a battery cell pack and a housing. The battery cell pack includes multiple battery cells stacked along a first direction, which is the thickness direction of the battery cells. The housing includes a receiving cavity for accommodating the battery cell pack. A beam extending along a second direction, perpendicular to the first direction, is disposed within the receiving cavity. The beam abuts against the battery cell pack along the first direction. The housing also includes a mounting portion located at at least one end of the beam along the second direction and connected to the beam. By positioning the mounting portion at at least one end of the beam along the second direction and connecting it to the beam, when the beam is under stress, the mounting portion can provide reliable support to the beam through its connected housing, enhancing the rigidity at both ends of the beam. This ensures that the housing has good structural strength and resistance to deformation while meeting its own lightweight design requirements.

[0057] The battery device disclosed in this application can be installed in an electrical device and supply power to the device. The electrical device 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.

[0058] For ease of explanation, the following embodiments will be described using vehicle 1 as an example of electrical equipment.

[0059] Please refer to Figure 1 , Figure 1This is a structural schematic diagram of vehicle 1 according to some embodiments of this specification. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1, and the battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1; for example, the battery device 10 can serve as the operating power source for vehicle 1, or it can be used in the electrical system of vehicle 1, for example, to meet the power requirements for starting, navigation, and operation of vehicle 1.

[0060] The vehicle 1 may also include a controller 30 and a motor 40, wherein the controller 30 is used to control the battery device 10 to supply power to the motor 40.

[0061] In some embodiments of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0062] Please refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 10 according to some embodiments of this specification. The battery device 10 includes a housing 20 and a battery cell pack 100. The battery cell pack 100 includes a plurality of battery cells 110. The housing includes a receiving cavity 22 for receiving the battery cell pack 100. In some embodiments, the battery device may also be referred to as a battery pack.

[0063] In the battery device 10, there can be multiple battery cells 110, which can be connected in series, in parallel, or in a mixed manner. A mixed connection means that some of the multiple battery cells 110 are connected in series and others in parallel. The battery device 10 may also include other structures, such as a busbar for realizing the electrical connection between the multiple battery cells 110.

[0064] Each battery cell 110 can be a primary battery or a secondary battery. Each battery cell 110 can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 110 can be cylindrical, flat, cuboid, or other shapes.

[0065] The housing 20 provides a space for housing the battery cell 110, and the housing 20 can adopt various structures. In some embodiments, the housing 20 may include an upper housing 211 and a lower housing 212, which cover each other and together define a space for housing the battery cell 110. In some embodiments, the housing 20 may include a lower housing 212 but not an upper housing 211, and the lower housing 212 is directly mounted on the body (such as an electrical device like a vehicle), defining a space for housing the battery cell 110.

[0066] The following is for reference. Figures 3 to 10 The structure of the housing in some embodiments of this application will be described in detail.

[0067] refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery device (excluding the upper casing) according to other embodiments shown in this specification. It should be noted that, although... Figure 3 The upper housing 211 is not shown in the diagram, but... Figure 3 The housing 20 of the battery device 10 shown may include both an upper housing 211 and a lower housing 212, or it may only include the lower housing 212.

[0068] The battery device 10 of some embodiments of this application is installed in an electrical device and supplies power to the device. The battery device 10 includes a battery cell pack 100 and a housing 20. The battery cell pack 100 includes a plurality of battery cells 110 stacked along a first direction, the thickness direction of the battery cells 110. The housing 20 includes a receiving cavity 22 for receiving the battery cell pack 100. A beam 23 extending along a second direction perpendicular to the first direction is disposed within the receiving cavity 22, and the beam 23 abuts against the battery cell pack 100 along the first direction. The housing 20 also includes a mounting portion 24 located at at least one end of the beam 23 along the second direction and connected to the beam 23.

[0069] The first direction can be the thickness direction of the battery cell 110. In some embodiments, the angle between the first direction and the large surface 111 of the battery cell is 75° to 90°. For example, the angle can be 80°. Alternatively, the first direction can be perpendicular to the large surface of the battery cell 110. The second direction can be the length direction of the battery cell 110. In some embodiments, the angle between the second direction and the large surface 111 of the battery cell 110 is 0° to 15°. For example, the angle can be 10°. Alternatively, the second direction can be parallel to the large surface of the battery cell 110.

[0070] Here, the large surface 111 refers to the surface with the largest area in the battery cell 110. The two large surfaces 111 of the battery cell 110 are arranged opposite each other, and the distance between the two large surfaces 111 defines the thickness of the battery cell 110. The expansion deformation generated by the battery cell 110 during charging and discharging mainly occurs in a direction perpendicular or approximately perpendicular to the large surface 111, so that the expansion force is output outward from the large surface 111.

[0071] The beam 23 refers to a structural reinforcement within the housing used to resist and constrain the volume expansion force generated by the battery cells 110 during charging and discharging. In some embodiments, the beam 23 may be made of resin-based carbon fiber composite material. Resin-based carbon fiber composite material uses high-modulus carbon fibers arranged along the direction of force as the main load-bearing skeleton, enabling it to efficiently resist deformation caused by external forces with extremely light weight and strong deformation resistance. In some embodiments, such as... Figure 3 As shown, the box body 20 may include two beams 23. The two beams 23 may have the same structure or different materials.

[0072] Mounting section 24 refers to the connection structure or connection point used to securely mount the housing 20 to the fuselage. The fuselage refers to the load-bearing body of electrical equipment (such as a vehicle) or the load-bearing structure within electrical equipment that bears and transmits loads (such as a battery bracket or mounting beam in a vehicle). The fuselage provides the mounting base and support points for the housing 20. This is merely an example. Figure 3 As shown, each of the two beams 23 in the housing 20 has a mounting part 24 at its end in the second direction, for a total of four mounting parts 24 in the housing 20. In some embodiments, the connection between the mounting part 24 and the body can be achieved in various ways, such as bolt connection, welding connection, riveting connection, snap-fit ​​connection, or fitting connection. The mounting part 24 and the beam 23 can be fixedly connected in various ways, such as adhesive connection, welding connection, riveting connection, snap-fit ​​connection, fitting connection, or integral molding.

[0073] The housing 20 is mainly connected to the fuselage via several mounting parts 24. After the battery cells 110 are placed inside the housing 20, they undergo expansion and deformation during charging and discharging. This cumulative deformation leads to significant deformation on both sides of the beam 23. Therefore, the beam 23 itself must be able to limit the deformation of the battery cells 110; otherwise, excessive deformation could cause cracking of the battery cell casing and electrolyte leakage. The beam 23 resists the expansion of the battery cells 110 by possessing high rigidity to prevent deformation and by relying on the support of the mounting parts 24. By placing the mounting parts 24 at the ends of the beam 23 in the second direction, the fuselage provides reliable support to the beam 23 under stress, enhancing the rigidity at both ends and preventing structural damage to the housing. In addition, the second direction (i.e. the extension direction of the beam 23) is perpendicular or approximately perpendicular to the direction in which the battery cell expands and deforms. The fuselage can further increase the ability of the beam 23 to resist the expansion and deformation of the battery cell through the mounting part 24, so as to avoid excessive deformation of the battery cell 110.

[0074] The mounting section 24 is connected to the beam 23 to transfer the load of the beam 23 to the fuselage. For example, the mounting section 24 and the beam 23 can be integrally molded by co-curing or co-bonding without additional connection processes, thereby eliminating the connection interface, improving structural strength and rigidity, reducing the number of parts, and simplifying the assembly process.

[0075] When a battery cell expands, its large surface 111 is the main surface exerting the expansion force. In the technical solution provided in this application embodiment, when a battery cell 110 is placed in the housing 20, the second direction is parallel or approximately parallel to the large surface 111 of the battery cell, which allows the expansion force to be converted more into compressive stress on the beam. The mounting part 24 is located at the end of the beam 23 in the second direction, and the beam 23 extends to the position of the mounting part 24, so that the mounting part 24 provides a reliable support point for the beam 23. Through this design, the load transmission path is optimized, avoiding the diversion and dissipation of force to non-load-bearing structures (such as the side wall of the housing) during the transmission process, ensuring that the expansion force of the battery cell 110, external extrusion force, and other loads are efficiently and relatively completely transmitted to the fuselage, significantly improving the structural strength and deformation resistance of the housing 20. The enclosures provided in some embodiments of this specification significantly improve structural strength and resistance to deformation through structural design, greatly reducing the dependence on enclosure material selection. Even when using lightweight composite materials with lower stiffness than metal materials, the enclosures can still have good structural strength and resistance to deformation, achieving an excellent balance between lightweight and high strength.

[0076] refer to Figure 4 , Figure 4This is an exploded structural diagram of a portion of the housing according to other embodiments of this specification. The housing 20 may further include a frame layer 26 and a skin layer 25, the skin layer 25 covering the frame layer 26, the frame layer 26 including a beam frame 261 forming a beam 23, and a mounting frame 262 forming a mounting portion 24, the beam frame 261 being connected to the mounting frame 262.

[0077] The skin layer 25 refers to a continuous thin layer of material covering the outer surface of the skeleton layer 26. In some embodiments, the skin layer 25 may also be made of resin-based carbon fiber composite material.

[0078] The skeleton layer 26 refers to the rigid structural layer that constitutes the main load-bearing frame of the box body 20. In some embodiments, the skeleton layer 26 includes a beam skeleton 261 forming the beam 23 and a mounting skeleton 262 forming the mounting part 24, with the beam skeleton 261 connected to the mounting skeleton 262. The beam skeleton 261 and the mounting skeleton 262 can be fixedly connected in various ways, such as adhesive connection, welding connection, riveting connection, snap-fit ​​connection, interlocking connection, integral molding, etc.

[0079] In some embodiments, the skeleton layer 26 and the skin layer 25 can be integrally molded by co-curing or co-bonding. For example, the skin layer 25 (such as multiple pre-impregnated resin fiber layers) and the skeleton layer 26 are stacked in a mold according to a design sequence. Through a single heating and pressurizing process, the resin is cured simultaneously, and the bonding between the components is completed at the same time, thereby obtaining an integral structural component. When using this process, the resin can simultaneously wet and bond the contact interface between the skeleton layer 26 and the skin layer 25 during the curing process, forming a reliable interface connection, and ultimately achieving the skin layer 25 covering the skeleton layer 26. The integral molding of the skeleton layer 26 and the skin layer 25 by co-curing or co-bonding results in a stronger overall structural integrity and a higher strength modulus.

[0080] In the technical solution provided in this application embodiment, the skeleton layer 26 is covered by the skin layer 25, and the beam skeleton 261 is directly connected to the mounting part skeleton 262, forming an integrated load-bearing structure of the beam 23 and the mounting part 24, thus optimizing the force transmission path.

[0081] In some embodiments, the beam frame 261 and the mounting frame 262 are integrally connected. For example, the beam frame 261 and the mounting frame 262 can be integrally molded by co-curing or co-bonding.

[0082] In the technical solution provided in this application embodiment, the beam frame 261 and the mounting frame 262 are integrally connected without the need for additional connection processes, thereby eliminating the connection interface, improving structural strength and rigidity, reducing the number of parts, and simplifying the assembly process.

[0083] In some embodiments, such as Figure 4 As shown, the skin layer 25 includes an outer skin 252 facing away from the receiving cavity 22, and the outer skin 252 integrally covers at least a portion of the surface of the beam frame 261 and at least a portion of the surface of the mounting frame 262.

[0084] In the technical solution provided in this application embodiment, the outer skin 252 is integrally covered with at least part of the surface of the beam frame 261 and the mounting frame 262 to form a continuous outer protective layer, which can effectively isolate external moisture, dust and corrosive media, and protect the internal frame; at the same time, it connects each frame into a whole, improving the overall rigidity and impact resistance of the box 20.

[0085] In some embodiments, such as Figure 4 As shown, the skin layer 25 also includes an inner skin 251 facing the receiving cavity. The inner skin 251 is integrally covered with at least a portion of the surface of the beam frame 261 and at least a portion of the surface of the mounting frame 262. The inner skin 251 and the outer skin 252 are interconnected.

[0086] In the technical solution provided in this application embodiment, the inner skin 251 is integrally covered with at least a portion of the surface of the beam frame 261 and the mounting frame 262, and is interconnected with the outer skin 252 to form a double-sided sandwich structure, completely enclosing the beam frame 261 and the mounting frame 262 within the skin layer 25. This structure significantly improves the bending and torsional stiffness and fatigue resistance of the box 20, enabling the skin and frame to work together to bear the load, avoiding local stress concentration, and enhancing the overall structural integrity and reliability.

[0087] In some embodiments, such as Figure 3 As shown, the box body 20 may include an outer perimeter plate 28, which are connected end to end to form a receiving cavity 22. The outer perimeter plate 28 includes two first outer perimeter plates 281 arranged opposite each other along a second direction. At least one end of the beam frame 261 protrudes from the first outer perimeter plate 281 along the second direction, and the part of the beam frame 261 protruding from the first outer perimeter plate 281 forms a mounting frame 262.

[0088] In some embodiments, the housing 20 may include a bottom plate 29. The bottom plate 29 extends along a second direction and a first direction and serves as the bottom support structure of the housing 20. An outer plate 28 is disposed above the bottom plate and extends along the first direction and the second direction, with the outer plates 28 joined end to end to form a receiving cavity 22.

[0089] In the technical solution provided in this application embodiment, by directly extending the end of the beam frame 261 and protruding the first outer plate 281 to form the mounting frame 262, the integrated structure of the beam 23 and the mounting part 24 is realized. There is no need to set up additional mounting brackets, which shortens the force transmission path and avoids stress concentration and failure risk of the mounting part 24. This improves the overall rigidity, torsional resistance and connection reliability of the box 20, while simplifying the assembly process and contributing to weight reduction.

[0090] refer to Figures 5-8 , Figure 5 This is a top view of the housing structure according to some embodiments shown in this specification; Figure 6 yes Figure 5 A cross-sectional view of the M region of the middle box along the AA direction; Figure 7 This is a side view structural diagram of the housing according to some embodiments of this specification; Figure 8 yes Figure 7 A cross-sectional view of the N region of the middle box along the BB direction.

[0091] In some embodiments, such as Figure 3 and Figure 6 As shown, the box body 20 includes an outer perimeter plate 28, which are connected end to end to form a receiving cavity 22. The outer perimeter plate 28 includes two first outer perimeter plates 281 arranged opposite each other along a second direction. At least one end of the beam body 23 along the second direction is provided with a recess 283 between it and the first outer perimeter plate 281. The beam body frame 261 is provided with a connecting rib frame 263 corresponding to the recess 283. The connecting rib frame 263 is integrally connected with the mounting part frame 262.

[0092] In the technical solution provided in this application embodiment, by setting a recessed portion 283 between the end of the beam 23 and the first outer peripheral plate 281, and using the connecting rib skeleton 263 to achieve an integral connection between the beam skeleton 261 and the mounting portion skeleton 262, it is possible to effectively avoid surrounding components or reserve operating space, while forming a continuous force transmission path, avoiding stress concentration, improving the structural strength and fatigue resistance of the box 20, and contributing to lightweight design.

[0093] In some embodiments, such as Figure 3 As shown, the housing 20 includes an outer perimeter plate 28, which are connected end to end to form a receiving cavity 22. The outer perimeter plate 28 includes two second outer perimeter plates 282 arranged opposite to each other along a first direction. The beam frame 261 forms the second outer perimeter plate 282 on the side away from the battery cell pack.

[0094] like Figure 3As shown, when two beams 23 are used, in addition to the second outer plate 282 formed on the side of the beam frame 261 away from the battery cell group, two outer plates 28 are also required, located on both sides of the beam 23 respectively, and then connected end to end to form the receiving cavity 22.

[0095] In the technical solution provided in this application embodiment, by directly using the side of the beam frame 261 away from the battery cell pack as the second outer perimeter plate 282, the function integration of the beam 23 and the other outer perimeter plates 28 is realized. There is no need to set the outer perimeter plates 28 opposite to each other along the first direction, which reduces the number of parts and assembly steps and is conducive to weight reduction. At the same time, the beam 23 and the other outer perimeter plates 28 form an integrated structure, so that the load can be directly transferred to the other outer perimeter plates of the box 20 through the beam 23, shortening the force transmission path and improving the overall structural rigidity and impact resistance.

[0096] Understandably, the number of beams 23 and the second outer perimeter plates 282 can be set according to actual structural requirements. For example, when a single beam 23 is used, in addition to the second outer perimeter plate 282 formed on the side of the beam frame 261 away from the battery cell assembly, three outer perimeter plates 28 are also required, located on both sides and opposite ends of the beam 23, and then connected end to end to form the receiving cavity 22.

[0097] In some embodiments, such as Figure 6 and Figure 8 As shown, the beam frame 261 and the mounting frame 262 may include at least one first support rib 231 extending along a first direction. The support rib refers to a reinforcing structure used to provide directional structural support.

[0098] In some embodiments, the beam frame 261 and the mounting frame 262 may further include beam walls 233. For example, as Figure 6 As shown, the beam wall 233 may include a wall panel located at the bottom of the beam frame 261 and the mounting frame 262, with its normal direction being the third direction. For example, as... Figure 8 As shown, the beam wall 233 may include two wall panels spaced apart along a first direction and extending along a second direction. The beam walls 233 in different directions can constitute the main structure of the beam frame 261 and the mounting frame 262. (The above...) Figure 6 and Figure 8 The beam wall 233 can form a cavity within the beam frame 261 and the mounting frame 262, and the first support rib 231 is disposed within the cavity. In some embodiments, the beam wall 233 may be discontinuous. This is merely an example. Figure 8 The two beam walls 233 shown have gaps to allow for clearance or weight reduction.

[0099] Since the first direction is perpendicular or approximately perpendicular to the large surface 111 of the battery cell, when the battery cell expands, its large surface 111 is the main surface exerting the expansion force. Therefore, the angle between the expansion direction of the battery cell 110 and the first direction (i.e., the extension direction of the first support rib 231) is 0°~15° (parallel or approximately parallel). In the technical solution provided by the embodiments of this application, at least one first support rib 231 extends along the first direction, which can increase the strength of the beam 23 in the first direction. When the battery cell 110 expands cyclically, the deformation of the beam 23 can be limited to less than 6mm, and the box body does not suffer structural failure.

[0100] In some embodiments, the inner diameter of the through hole 241 may be larger than the outer diameter of the connecting portion 273, and the cross-sectional shapes of the two may also differ. (See reference) Figure 6 and Figure 8 In some embodiments, at least one second support rib 232 is provided between the outer wall of the connecting portion 273 and the inner wall of the through hole 241. The second support rib 232 is fixedly connected to the beam wall 233 and / or the first support rib 231. In some embodiments, the second support rib 232 may be integrally formed with the beam frame 261 and the mounting portion frame 262.

[0101] In some embodiments, such as Figure 6 As shown, the beam wall 233 located at the bottom of the beam frame 261 can strengthen the connection between the first support rib 231 and the second support rib 232, preventing relative displacement or deformation of the first support rib 231 and the second support rib 232 when subjected to external forces. To improve the connection strength between the beam frame 261 and the mounting frame 262, the beam wall 233 at the bottom of the beam frame 261 can be thickened or heightened to reduce the risk of stress concentration at the root of the first support rib 231. As an example, it is possible to... Figure 6 A connecting bar 234 is added above the beam wall 233 at the bottom of the beam frame 261 and between two adjacent first support bars 231 to form a U-shaped beam structure. This effectively reduces the risk of stress concentration at the root of the first support bar 231 while avoiding excessive increase in the weight of the box.

[0102] In other embodiments, such as Figure 8 As shown, the beam walls 233 spaced apart along the first direction are used to strengthen the connection strength between the first support ribs 231 and prevent the first support ribs 231 from undergoing relative displacement or deformation when subjected to external force.

[0103] In the technical solution provided in this application embodiment, the first support rib 231 extends through the beam wall 233 to the position of the second support rib 232, realizing the transmission of expansion force from the beam 23 to the mounting part 24. When the mounting part 24 is locked to the fuselage, the connecting parts 273 abut against each other to achieve support, and the second support rib 232 supports the flange part 2741, enhancing the structural reliability and stability.

[0104] In some embodiments, reference Figure 4 In some embodiments, the mounting portion 24 is provided with a mounting connector 27. The mounting connector 27 may include a connecting portion 273 and an extension portion 274 connected to the connecting portion 273. The connecting portion 273 is used to connect to electrical equipment, and the extension portion 274 is fixedly connected to the outer surface 242 of the mounting portion 24.

[0105] The mounting part 24 has a through hole 241, and the connecting part 273 passes through the through hole 241 so that the mounting part 24 can be connected to the electrical equipment by means of bolts and nuts.

[0106] In some embodiments, the mounting connector is a metal bushing. For example, the mounting connector can be made of carbon steel, stainless steel, copper alloy, aluminum alloy, etc.

[0107] Since the resin portion of the resin-based carbon fiber composite material of the housing 20 is prone to wear and thinning, if the mounting part 24 is directly connected to the fuselage, there is a risk of bolts falling off or twisting after the resin on the surface of the mounting part 24 thins, which may lead to bolt loosening in the long term; while metal bushings are not prone to wear or plastic deformation.

[0108] The shape of the connecting portion 273 can match that of the through hole 241. For example, both the connecting portion 273 and the through hole 241 can be cylinders. Or, for example, both the connecting portion 273 and the through hole 241 can be cuboids. The connecting portion 273 is a hollow tubular structure.

[0109] The extension portion 274 refers to the portion that extends outward and protrudes from the connecting portion 273. In some embodiments, after the main body of the housing is formed, the extension portion 274 can be fixedly connected to the outer surface 242 of the mounting portion 24 using structural adhesive. More information about the main body of the housing can be found above and in its corresponding description.

[0110] The extension portion 274 and the outer surface 242 of the mounting portion 24 are fixedly connected by structural adhesive. In some embodiments, the thickness of the structural adhesive is in the range of 0.2 mm to 1 mm, which allows the structural adhesive to have good strength. Specifically, when the thickness of the structural adhesive is within the above range, it can avoid both insufficient adhesive thickness and reduced bonding strength, and excessive adhesive thickness and cohesive failure of the adhesive layer. For example, the thickness of the structural adhesive can be 0.5 mm.

[0111] In the technical solution provided in this application embodiment, by using the connecting part 273 to connect with electrical equipment and fixing the extension part 274 to the outer surface 242 of the mounting part 24, the mounting connector 27 can be stably installed.

[0112] In some embodiments, the connecting portion 273 includes a through section and an exposed section (not shown). The through section passes through at least a portion of the mounting portion 24, and the exposed section exposes the surface of the mounting portion 24 and is connected to the extension portion 274.

[0113] The through section refers to the portion of the connecting part 273 that passes through at least a portion of the mounting part 24. For example, the through section can be hollow, threaded, or have a raised ring. The exposed section refers to the portion of the connecting part 273 that protrudes outward from the surface of the mounting part 24. The exposed section and the extension part 274 can be fixedly connected in various ways, such as adhesive connection, welding connection, riveting connection, snap-fit ​​connection, fitting connection, integral molding, etc.

[0114] In the technical solution provided in this application embodiment, by setting at least a through section that passes through the mounting part 24 and using the exposed section to fix the extension part 274, the bonding strength between the mounting connector 27 and the mounting part 24 is effectively enhanced. External loads can be distributed and transferred from the connecting part 273 to the mounting part 24 through the through section and the extension part 274, avoiding stress concentration and improving connection reliability and tensile and torsional performance.

[0115] In some embodiments, the bonding area between the mounting connector 27 and the mounting portion 24 can further meet preset stress requirements, thereby better meeting structural reliability requirements. For example, the bonding area The requirements of formula (1) must be met:

[0116] (1)

[0117] in, The bonding area between the mounting connector 27 and the mounting part 24 is [missing information]. This represents the maximum stress at the mounting portion 24 during the cyclic expansion of the battery cell 110. This represents the shear strength of the structural adhesive. Among them, It can be determined through simulation (such as finite element analysis). It can be determined by the type of structural adhesive or interface testing (such as shear strength testing).

[0118] As can be seen from formula (1), the extension portion 274 of the mounting connector 27 effectively increases the bonding area between the mounting connector 27 and the mounting portion 24, thereby significantly improving the bonding strength.

[0119] refer to Figure 9 , Figure 9This is a schematic diagram of the structure of the mounting connector according to some embodiments of this specification. In some embodiments, the extension 274 includes a flange 2741 connected to the exposed section and a bent portion 2742 connected to the flange 2741. The flange 2741 forms a first connecting surface (not shown) connected to the mounting portion 24, and the bent portion 2742 forms a second connecting surface (not shown) connected to the mounting portion 24. The first connecting surface and the second connecting surface are intersecting.

[0120] Flange 2741 refers to the annular flange formed around the opening at one end of the connecting portion 273. In some embodiments, the shape of flange 2741 can be circular, elliptical, square, rectangular, etc.

[0121] The bent portion 2742 refers to a sheet-like structure that extends outward from the outer peripheral edge of the flange portion 2741. In order to fix the extension portion 274 to the outer surface 242 of the mounting portion 24, the shapes of the flange portion 2741 and the bent portion 2742 can match the shape of the outer surface 242 of the mounting portion 24.

[0122] In the technical solution provided in this application embodiment, by setting the bending part 2742, the fixing (such as bonding) area between the mounting connector 27 and the mounting part 24 can be effectively increased, thereby realizing the stable installation of the mounting connector 27 and effectively improving the connection reliability and structural strength.

[0123] In some embodiments, the through section includes a sleeve extending along a third direction, which is perpendicular to the first and second directions.

[0124] A sleeve is a hollow cylindrical structure that extends in a third direction.

[0125] The third direction can be the height direction of the battery cell 110, that is, a vertical direction that is perpendicular to both the second and first directions. In some embodiments, the angle between the third direction and the plane formed by the second and first directions is 75° to 90°. For example, the angle can be 80°. Or, for example, the angle can be 90°.

[0126] In the technical solution provided in this application embodiment, the through section adopts a sleeve structure extending along a third direction, which can increase the contact area with the mounting part 24, so that the pull-out force is evenly distributed along the entire length of the sleeve inside the mounting part 24, avoiding local crushing; at the same time, the sleeve provides precise guidance and positioning for the fastener, which is convenient for assembly and effectively transmits multi-directional loads, avoids local stress concentration, and enhances the overall reliability and durability of the mounting connector 27.

[0127] In some embodiments, the mounting portion 24 is provided with a through hole 241. The mounting portion 24 may include a first surface and a second surface spaced apart along a third direction, and a third surface (not shown in the figure) located between the first surface and the second surface. The first surface and the second surface are connected through the through hole 241. The flange portion 2741 is fixedly connected to the first surface or the second surface of the mounting portion 24, and the bent portion 2742 is fixedly connected to the third surface of the mounting portion 24.

[0128] As mentioned earlier, the lifting force provided by the fuselage for the entire battery device is transmitted sequentially through the mounting connector 27, structural adhesive, mounting part 24, and beam 23. If the bonding area is insufficient, cracking can easily occur at the structural adhesive between the mounting part 24 and the mounting connector 27, leading to interruption of force transmission. In the technical solution provided in this application embodiment, by fixing the flange part 2741 to the first or second surface of the mounting part, and fixing the bent part 2742 to the third surface of the mounting part, reliable fixed connection between the extension part 274 and the outer surface 242 of the mounting part 24 in multiple directions and regions is achieved, effectively improving the stability of the connection structure and increasing the load-bearing limit.

[0129] refer to Figure 10 , Figure 10 This is a structural schematic diagram of a mounting connector according to some embodiments of this specification. In some embodiments, the mounting connector 27 includes a first mounting connector 271 and a second mounting connector 272. The first mounting connector 271 and the second mounting connector 272 are disposed opposite each other on the same mounting part 24 along a third direction, which is perpendicular to the first direction and the second direction.

[0130] The connecting part 273 of the first mounting connector 271 passes through the opening at one end of the through hole 241 and is inserted into the through hole 241. The connecting part 273 of the second mounting connector 272 passes through the opening at the other end of the through hole 241 and is inserted into the through hole 241.

[0131] The sum of the heights of the through sections of the connecting portion 273 of the first mounting connector 271 and the connecting portion 273 of the second mounting connector 272 is greater than (or slightly greater than) the height of the through hole 241. This ensures that after the connecting portions 273 of the first mounting connector 271 and the connecting portions 273 of the second mounting connector 272 abut against each other, sufficient space for the adhesive bonding thickness can be reserved between the flange portion 2741 of the first mounting connector 271 and the first surface (or second surface) of the mounting portion 24, and between the flange portion 2741 of the second mounting connector 272 and the second surface (or first surface) of the mounting portion 24. The height of the bent portion 2742 is less than the height of the connecting portion 273, so that the two connecting portions 273 contact first during mating.

[0132] In the technical solution provided in this application embodiment, a first mounting connector 271 and a second mounting connector 272 are arranged opposite each other along a third direction on the same mounting part 24 to form a bidirectional symmetrical support structure, which can effectively balance the loads from different directions, avoid the eccentric load and overturning moment caused by unilateral force, and improve the torsional resistance and connection stability of the mounting point.

[0133] In some embodiments, the first mounting connector 271 includes a first sleeve portion that passes through the through hole 241, and the second mounting connector 272 includes a second sleeve portion that passes through the through hole 241, with the first sleeve portion and the second sleeve portion abutting against each other. Here, abutting refers to a mating state in which the first sleeve portion and the second sleeve portion are in contact with each other and abut against each other.

[0134] In the technical solution provided in this application embodiment, the first sleeve portion and the second sleeve portion abut against each other. When connected to the machine body by bolts, the force of the bolts is transmitted through the first sleeve portion and the second sleeve portion, thereby effectively avoiding the risk of twisting after long-term use. When the first mounting connector 271 and the second mounting connector 272 are metal bushings, the risk of twisting after long-term use can be further reduced.

[0135] According to an embodiment of this application, a battery device 10 is provided. The battery device 10 is installed in an electrical device and supplies power to the device. The battery device 10 includes a battery cell pack 100 and a housing 20. The battery cell pack 100 includes a plurality of battery cells 110 stacked along a first direction, the first direction being the thickness direction of the battery cells 110. The housing 20 includes a receiving cavity 22 for receiving the battery cell pack 100. A beam 23 extending along a second direction is disposed within the receiving cavity 22, the second direction being perpendicular to the first direction. The beam 23 abuts against the battery cell pack 100 along the first direction. The housing 20 also includes a mounting portion 24, which is located at at least one end of the beam 23 along the second direction and connected to the beam 23. The mounting portion 24 is provided with a metal mounting connector 27. The mounting connector 27 may include a connecting portion 273 and an extension portion 274 connected to the connecting portion 273. The connecting portion 273 is used for connection with electrical equipment, and the extension portion 274 is fixedly connected to the outer surface 242 of the mounting portion 24. The extension portion 274 includes a flange portion 2741 connected to the exposed section, and a bent portion 2742 connected to the flange portion 2741. The flange portion 2741 forms a first connecting surface connected to the mounting portion 24, and the bent portion 2742 forms a second connecting surface connected to the mounting portion 24. The first connecting surface and the second connecting surface are intersecting. The mounting connector 27 further includes a first mounting connector 271 and a second mounting connector 272. The first mounting connector 271 and the second mounting connector 272 are arranged opposite each other along a third direction on the same mounting portion 24. The third direction is perpendicular to the first direction and the second direction. The first mounting connector 271 includes a first sleeve portion that passes through the through hole 241, and the second mounting connector 272 includes a second sleeve portion that passes through the through hole 241. The first sleeve portion and the second sleeve portion abut against each other.

[0136] During assembly, bolts are sequentially inserted into the first through hole on the machine body, the first sleeve portion of the first mounting connector 271, the second sleeve portion of the second mounting connector 272, and the second through hole on the machine body, and the bolts are tightened with nuts to achieve a fixed connection between the housing 20 and the machine body.

[0137] This application also provides an electrical device, which includes a battery device 10 as described above, the battery device 10 serving as a power source for the electrical device and / or an energy storage unit for the electrical device.

[0138] The beneficial effects that the embodiments of this specification may bring include, but are not limited to: (1) By setting the mounting part at at least one end of the beam along the second direction and connecting it to the beam 23, the mounting part can provide reliable support for the beam through the connected body, ensuring that the box has good structural strength and deformation resistance while meeting its own lightweight design requirements. (2) The extension part of the mounting connector can effectively increase the bonding area between the mounting connector and the mounting part, thereby improving the bonding strength. It should be noted that different embodiments may produce different beneficial effects. In different embodiments, the beneficial effects that may be produced can be any one or a combination of the above, or any other possible beneficial effects.

[0139] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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, installed in an electrical appliance and supplying power to the electrical appliance, characterized in that, include: A battery cell assembly includes multiple battery cells stacked along a first direction, where the first direction is the thickness direction of the battery cells. The housing includes a receiving cavity for accommodating the battery cell pack. A beam extending along a second direction is disposed within the receiving cavity. The second direction is perpendicular to the first direction. The beam abuts against the battery cell pack along the first direction. The box body also includes a mounting part, which is located at at least one end of the beam along the second direction and connected to the beam. The enclosure also includes a frame layer and a skin layer. The skin layer covers the frame layer. The frame layer includes a beam frame forming the beam body and a mounting frame forming the mounting part. The beam frame is connected to the mounting frame.

2. The battery device according to claim 1, characterized by The beam frame is integrally connected to the mounting frame.

3. The battery device of claim 2, wherein, The box body includes an outer perimeter plate, which are connected end to end to form the receiving cavity. The outer perimeter plate includes two first outer perimeter plates arranged opposite each other along the second direction. At least one end of the beam frame protrudes from the first outer perimeter plate along the second direction, and the portion of the beam frame protruding from the first outer perimeter plate forms the mounting frame.

4. The battery device of claim 2, wherein The box body includes an outer perimeter plate, which are connected end to end to form the receiving cavity. The outer perimeter plate includes two first outer perimeter plates arranged opposite each other along the second direction. At least one end of the beam body along the second direction is provided with a recess between it and the first outer perimeter plate. The beam body frame is provided with a connecting rib frame corresponding to the recess. The connecting rib frame is integrally connected to the mounting part frame.

5. The battery device of claim 1, wherein The housing includes an outer perimeter plate, which are connected end to end to form the receiving cavity. The outer perimeter plate includes two second outer perimeter plates arranged opposite each other along the first direction. The second outer perimeter plate is formed on the side of the beam frame away from the battery cell group.

6. The battery device according to any one of claims 1 to 5, wherein The skin layer includes an outer skin facing away from the receiving cavity, and the outer skin integrally covers at least a portion of the surface of the beam frame and at least a portion of the surface of the mounting frame.

7. The battery device of claim 6, wherein The skin layer also includes an inner skin facing the receiving cavity, the inner skin integrally covering at least a portion of the surface of the beam frame and at least a portion of the surface of the mounting frame, and the inner skin is connected to the outer skin.

8. The battery device of claim 1, wherein The mounting part is provided with a mounting connector, which includes a connecting part and an extension part connected to the connecting part; the connecting part is used to connect to the electrical equipment, and the extension part is fixedly connected to the outer surface of the mounting part.

9. The battery device of claim 8, wherein, The connecting portion includes a through section and an exposed section. The through section passes through at least a portion of the mounting portion, and the exposed section exposes the surface of the mounting portion and is connected to the extension portion.

10. The battery device of claim 9, wherein, The extension includes a flange portion connected to the exposed section and a bent portion connected to the flange portion. The flange portion forms a first connecting surface connected to the mounting portion, and the bent portion forms a second connecting surface connected to the mounting portion. The first connecting surface and the second connecting surface are intersecting.

11. The battery device of claim 10, wherein, The through section includes a sleeve extending along a third direction, which is perpendicular to the first direction and the second direction.

12. The battery device of claim 11, wherein, The mounting part is provided with a through hole, and the mounting part includes a first surface and a second surface spaced apart along the third direction, and a third surface located between the first surface and the second surface; the first surface and the second surface are connected through the through hole; The flange portion is fixedly connected to the first or second surface of the mounting portion, and the bent portion is fixedly connected to the third surface of the mounting portion.

13. The battery device according to any one of claims 8 to 12, wherein The mounting connector includes a first mounting connector and a second mounting connector. The first mounting connector and the second mounting connector are disposed opposite each other along a third direction on the same mounting part. The third direction is perpendicular to the first direction and the second direction.

14. The battery device of claim 13, wherein, The first mounting connector includes a first sleeve portion that passes through a through hole, and the second mounting connector includes a second sleeve portion that passes through the through hole, with the first sleeve portion abutting against the second sleeve portion.

15. An electrical device, characterized by Includes the battery device as described in claim 1, wherein the battery device serves as a power source for the electrical device and / or an energy storage unit for the electrical device.

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