Box body, battery device and electric device

Abstract

The utility model relates to the technical field of batteries, and provides a box body, a battery device and a power utilization device, the battery device comprises the box body and a plurality of battery monomers, and the box body comprises a body and an expansion beam; the plurality of single batteries are arranged in the body along a first direction; the expansion beam comprises a first beam and a second beam which are arranged in the body, the first beam and the second beam are stacked in the height direction of the battery single bodies and connected with each other, the first beam and the second beam abut against the end faces of the battery single bodies in the first direction, and the rigidity of the first beam is larger than that of the second beam. The overall rigidity and bearing capacity of the expansion beam can be improved, deformation caused by expansion of the battery monomers is effectively restrained, and therefore the structural stability and reliability of the battery device are improved.

Description

Technical Field

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

[0002] Battery devices convert chemical energy into electrical energy and are widely used in electric vehicles, energy storage systems, and other equipment to provide the required electrical output. During use, individual battery cells expand, potentially causing deformation and damage. To address this, expansion beams are typically installed within the battery device to resist the expansion of the individual cells. However, existing expansion beams have relatively weak stiffness, resulting in poor anti-expansion performance. Utility Model Content

[0003] In view of the above-mentioned technical problems, the purpose of this application is to provide a housing, a battery device and an electrical device, which aims to solve the problem that the expansion beam in the existing battery device has weak rigidity, resulting in poor anti-expansion effect.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] In a first aspect, embodiments of this application provide a battery device, comprising:

[0006] The box-shaped structure includes the main body and the expansion beams;

[0007] Multiple battery cells are arranged in the body along a first direction;

[0008] The expansion beam includes a first beam and a second beam disposed within the main body. The first beam and the second beam are stacked and connected to each other along the height direction of the battery cell. The first beam and the second beam abut against the end face of the battery cell in the first direction, and the stiffness of the first beam is greater than that of the second beam.

[0009] In the above technical solution, by setting a first beam with higher stiffness than the second beam and stacking and connecting the two along the height direction to form a composite expansion beam structure, the overall stiffness and load-bearing capacity of the expansion beam can be improved, effectively suppressing the deformation caused by the expansion of the battery cells, thereby improving the structural stability and reliability of the battery device.

[0010] In some embodiments, the expansion force of the first beam abutting the end face of the battery cell is greater than the expansion force of the second beam abutting the end face of the battery cell.

[0011] In the above technical solution, by placing the high-stiffness first beam in the area of ​​large expansion force on the end face of the battery cell and the low-stiffness second beam in the area of ​​small expansion force, the expansion beam structure is matched with the actual load distribution, thereby improving the expansion beam's anti-expansion efficiency.

[0012] In some embodiments, the first beam abuts against the middle of the end face of the battery cell, and the second beam abuts against the edge of the end face of the battery cell.

[0013] In the above technical solution, since the expansion force in the middle of a battery cell is greater than that at the edges during charging and discharging, a match between the structural stiffness of the expansion beam and the distribution of expansion force is achieved by placing a high-stiffness first beam in the high-load middle region and a low-stiffness second beam in the low-load edge region. This allows the high expansion force to be borne by the high-stiffness beam, thereby significantly improving the deformation resistance of key areas, optimizing the load transfer path, and thus improving the expansion beam's anti-expansion efficiency.

[0014] In some embodiments, there are two second beams, and the first beam connects the two second beams.

[0015] In the above technical solution, since the expansion force in the middle of the battery cell end face is greater than that in the upper and lower edge regions, this layout allows the high-stiffness first beam to precisely correspond to the high-load middle region, bearing the main expansion force, while the two low-stiffness second beams correspond to the low-load edge regions, providing adaptive support. This achieves full coverage of the battery cell end face while matching the stiffness distribution with the expansion force distribution, significantly improving the deformation resistance of the expansion beams and effectively suppressing the expansion deformation of the battery cells.

[0016] In some embodiments, the contact area of ​​the first beam abutting the end face of the battery cell is greater than the contact area of ​​the second beam abutting the end face of the battery cell.

[0017] In the above technical solution, since the first beam has higher stiffness, by increasing its contact area, it can cover the main area with large expansion force in the battery end face, thereby bearing a larger proportion of expansion load, improving the overall compressive strength of the expansion beam, and suppressing the expansion deformation of the battery cell.

[0018] In some embodiments, the height of the first beam is greater than the height of the second beam.

[0019] In the above technical solution, by increasing the extension range of the high-rigidity first beam in the height direction of the battery, it can cover more areas of the end face of the battery cell, thereby bearing a larger range of expansion loads, improving the overall expansion resistance of the expansion beam, and effectively suppressing the expansion deformation of the battery cell.

[0020] In some embodiments, the battery device includes a first fastening assembly, the first fastening assembly including a first rivet nut and a first bolt;

[0021] The first pull rivet nut is connected in the second beam, and the first bolt is arranged in the first beam along the height direction and connected with the first pull rivet nut; or the first pull rivet nut is connected in the first beam, and the first bolt is arranged in the second beam along the height direction and connected with the first pull rivet nut.

[0022] In the technical solution, the detachable connection between the first beam and the second beam can be realized by using the pull rivet bolt connection mode. The connection mode not only facilitates assembly and maintenance, but also enables the two beams to be tightly attached by the pre-tightening force of the first bolt, thereby forming a whole structure that cooperatively bears force, and the overall rigidity and anti-deformation capability of the expansion beam are significantly improved.

[0023] In some embodiments, the first fastening assembly comprises a first reinforcing member supported in the first beam and / or the second beam along the height direction.

[0024] In the technical solution, the first reinforcing member can be arranged inside to improve the compression rigidity of the expansion beam without increasing the external profile size of the expansion beam, thereby effectively preventing the deformation of the beam body under the expansion force. Meanwhile, the internal space of the battery box can be avoided to be occupied, and the installation space of the battery monomer is maximized, which is beneficial to improving the energy density of the battery device.

[0025] In some embodiments, the first reinforcing member is sleeved on the first bolt, the first beam comprises a first end wall and a second end wall arranged in the height direction and spaced from top to bottom, the second beam comprises a third end wall adjacent to the second end wall, the first bolt is connected with the first pull rivet nut by penetrating the first beam from the upper surface of the first end wall and passing through the second end wall, and the first reinforcing member penetrates the first beam from the lower surface of the third end wall and abuts against the lower surface of the first end wall.

[0026] In the technical solution, the stable connection between the first beam and the second beam can be realized by the cooperation of the first bolt and the first pull rivet nut, and the beam rigidity at the bolt connection position can be improved by sleeving the first reinforcing member on the first bolt, thereby preventing the beam body from being crushed or deformed at the bolt connection position.

[0027] In some embodiments, the first reinforcing member has a first end and a second end opposite in the height direction, the first end is provided with a flange, and the first reinforcing member is provided with a guide channel extending along the height direction.

[0028] The first end wall is provided with a first hole, the second end wall is provided with a second hole corresponding to the first hole, the first reinforcing member is arranged in the second hole to the first beam, and the flange protrudes from a side edge of the second hole away from the first hole, and the second end is connected to a side edge of the first hole towards the second hole; the third end wall is provided with a third hole corresponding to the second hole, and the first lock nut is connected to the third hole.

[0029] The first bolt is arranged in the first hole and the guide channel and connected with the first lock nut.

[0030] In the above technical solution, the flange can realize quick positioning and installation of the first reinforcing member, and the guide channel can provide accurate guidance for the bolt, thereby effectively improving the assembly efficiency and connection accuracy between the first beam and the second beam.

[0031] In some embodiments, the battery device comprises a second reinforcing member supported in the first beam and / or the second beam along the first direction.

[0032] In the above technical solution, by supporting the second reinforcing member in the beam body along the first direction, the second reinforcing member can bear the thrust along the first direction generated by the expansion of the battery monomer, improve the compressive stiffness and structural stability of the beam body in the expansion direction, thereby effectively inhibiting the deformation risk of the beam body. Moreover, the second reinforcing member is built-in in the beam body, does not occupy additional space in the battery box, maximizes the installation space of the battery monomer, and is beneficial to improve the energy density of the battery device.

[0033] In some embodiments, the second reinforcing member in the first beam is located in the middle part of the first beam.

[0034] In the above technical solution, since the middle part of the end face of the battery monomer bears more expansion force during charging and discharging, by arranging the second reinforcing member corresponding to the high stress middle part position of the first beam, the structural stiffness and anti-deformation ability of the region can be targetedly enhanced.

[0035] In some embodiments, the body comprises a bottom wall, and the second beam located below the first beam is connected to the bottom wall.

[0036] In the above technical solution, by fixedly connecting the lower second beam to the bottom wall, the installation stability of the entire expansion beam structure can be improved, and the movement of the expansion beam under the action of the battery expansion force can be effectively prevented, thereby ensuring the reliability of the anti-expansion.

[0037] In some embodiments, the body includes two side walls opposite in a second direction, the side walls being connected to the bottom wall; at least one end of the first beam extending direction corresponds to the connection of at least one of the side walls, and / or at least one end of the second beam extending direction corresponds to the connection of at least one of the side walls; wherein the first direction and the second direction are perpendicular to each other.

[0038] In the above technical solution, by connecting the end of the beam body with the side wall, the assembly stability of the expansion beam can be further enhanced, the movement of the beam body under the action of the battery expansion force can be effectively prevented, and the reliability of the anti-expansion can be ensured.

[0039] In some embodiments, the first beam is a steel beam, and / or the second beam is an aluminum beam.

[0040] In the above technical solution, by using the above materials, the expansion beam of the present application can reduce the material cost as much as possible on the premise of improving the overall rigidity.

[0041] In some embodiments, the number of the expansion beams is at least two, and the battery monomer is arranged between each adjacent two expansion beams.

[0042] In the above technical solution, by arranging a plurality of expansion beams, the battery monomer can be effectively clamped, so that better anti-expansion effect can be achieved.

[0043] In a second aspect, the embodiments of the present application also provide a power utilization device, comprising: the battery device in the above embodiments, the battery device being used for providing electric energy.

[0044] In a third aspect, the embodiments of the present application also provide a box body, comprising a body and an expansion beam, the body being used for accommodating a plurality of battery monomers arranged in a first direction, the expansion beam comprising a first beam and a second beam arranged in the body, the first beam and the second beam being stacked in the height direction of the battery monomers and being connected to each other, the first beam and the second beam being used for abutting the end surface of the battery monomer in the first direction, and the rigidity of the first beam being greater than that of the second beam.

[0045] In the above technical solution, by arranging the first beam with higher rigidity than the second beam, and stacking and connecting the two in the height direction to form a composite expansion beam structure, the overall rigidity and carrying capacity of the expansion beam can be improved, and the deformation caused by the expansion of the battery monomer can be effectively inhibited.

[0046] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0047] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the vehicle structure provided in an embodiment of this application;

[0049] Figure 2 This is an exploded view of the battery device provided in the embodiments of this application;

[0050] Figure 3 This is a schematic diagram of the assembly of a single battery cell and an expansion beam from one perspective, provided in an embodiment of this application.

[0051] Figure 4 for Figure 3 A magnified view of part A;

[0052] Figure 5 This is one of the structural schematic diagrams of the expansion beam provided in the embodiments of this application;

[0053] Figure 6 This is the second schematic diagram of the expansion beam provided in the embodiments of this application;

[0054] Figure 7 This is another assembly diagram of the battery cell and expansion beam provided in an embodiment of this application;

[0055] Figure 8 for Figure 7 Sectional view at BB;

[0056] Figure 9 for Figure 8 A magnified view of a portion at point C;

[0057] Figure 10 This is the third schematic diagram of the expansion beam provided in the embodiments of this application;

[0058] Figure 11 for Figure 8 A magnified view of a portion of point D.

[0059] The following are the labeling elements in the figure:

[0060] 1000, Vehicle; 100, Battery unit; 200, Controller; 300, Motor;

[0061] 10. Box body; 11. Main body; 111. Top cover; 112. Bottom plate; 1121. Bottom wall;

[0062] 12, expansion beam; 121, first beam; 1211, first end wall; 1212, second end wall;

[0063] 1213, first hole; 1214, second hole; 122, second beam; 1221, third end wall;

[0064] 1222, third hole;

[0065] 20, battery cell;

[0066] 30, first fastening assembly; 301, first pull-rivet nut; 302, first bolt;

[0067] 303, first reinforcement; 3031, first end; 3032, second end; 3033, flange;

[0068] 3034, guide channel;

[0069] 40, second reinforcement;

[0070] 50, second fastening assembly; 501, second pull-rivet nut; 502, second bolt. DETAILED DESCRIPTION

[0071] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0072] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0073] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0074] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a common embodiment, or an embodiment that is independent of other embodiments. Those of ordinary skill in the art will recognize that the embodiments described herein can be combined with other embodiments in various ways.

[0075] In the description of the embodiments of the application, the term“and / or” only means an association relationship of the associated objects, which can represent three relationships, for example, A and / or B, which can represent three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character“ / ” herein generally represents an“or” relationship between the front and rear associated objects.

[0076] In the description of the embodiments of the application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).

[0077] In the description of the embodiments of the application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the application.

[0078] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0079] At present, the battery cells in the battery device will expand in the charging and discharging cycle process or other factors, causing the battery cells to deform and damage. Therefore, an expansion beam is usually arranged in the battery device to resist the expansion of the battery cells. However, the existing expansion beam is usually a single aluminum profile beam structure, which has weak rigidity, resulting in poor anti-expansion effect.

[0080] In order to improve the overall stiffness and anti-expansion ability of the expansion beam, the embodiment of the present application provides a composite expansion beam with different stiffness, which combines the first beam with higher stiffness in the expansion beam structure, uses the first beam with high stiffness as the main bearing structure, can improve the overall stiffness and anti-deformation ability of the expansion beam, effectively suppresses the expansion and deformation of the battery monomer, and improves the reliability of the battery device.

[0081] The battery device disclosed in the embodiment of the present application can be used in a power consumption device using the battery device as a power supply or a variety of energy storage systems using the battery device as an energy storage element. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0082] The following embodiments are described with reference to a power consumption device of an embodiment of the present application as an example of a vehicle 1000 for convenience of description.

[0083] Referring to Figure 1 , the Figure 1 structure diagram of the vehicle provided by the embodiment of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation and driving.

[0084] In some embodiments, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0085] Referring to Figure 2 , the Figure 2 structure explosion diagram of the battery device provided by the embodiment of the present application. The battery device 100 mentioned in the embodiment of the present application can include one or more battery monomer assemblies for providing voltage and capacity. The battery monomer assembly can include a plurality of battery monomers 20 connected in series, parallel or mixed connection through the busbar component.

[0086] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 20.

[0087] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 20 into a single module. As an example, the battery module can be formed by bundling multiple battery cells 20 together with cable ties.

[0088] In some embodiments, the battery device 100 may be a battery pack, which includes a housing and one or more battery cell assemblies housed within the housing.

[0089] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0090] As an example, such as Figure 2 As shown, the housing 10 may include a body 11 and expansion beams 12. The body 11 includes a top cover 111, a frame (not shown in the figure), and a bottom plate 112. The top cover 111 and the bottom plate 112 are respectively connected to the frame, so that the interior of the body 11 forms a closed space to accommodate the battery cell assembly and the expansion beams 12. There may be multiple expansion beams 12, which are used to clamp the battery cell assembly to resist the expansion force of the battery cell 20 and prevent the battery cell 20 from deforming.

[0091] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0092] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells 20, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles 1000, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0093] In this embodiment of the application, the battery cell 20 can be a secondary battery, which refers to a battery cell 20 that can be used again after being discharged by recharging to activate the active materials.

[0094] The battery cell 20 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.

[0095] In some embodiments, referring to Figures 2 to 5 as shown, Figure 3 a battery cell and an expansion beam from one perspective of the assembly schematic diagram provided by the embodiments of the present application, Figure 4 for Figure 3 the partial enlarged view of A; Figure 5 One of the structural schematic diagrams of the expansion beam provided by the embodiments of the present application. The battery device 100 provided by the embodiments of the present application comprises a box body 10 and a plurality of battery cells 20. Wherein, the box body 10 comprises a body 11 and an expansion beam 12; the plurality of battery cells 20 are arranged along the first direction X in the body 11; the expansion beam 12 comprises a first beam 121 and a second beam 122 arranged in the body 11, the first beam 121 and the second beam 122 are stacked and connected along the height direction Z of the battery cell 20, the first beam 121 and the second beam 122 abut the end surface of the battery cell 20 in the first direction X, and the rigidity of the first beam 121 is greater than that of the second beam 122.

[0096] As Figure 2 shown, the first direction X is the length direction of the box body 10, or the thickness direction of the battery cell 20, the second direction Y is the width direction of the box body 10, or the length direction of the battery cell 20, and the first direction X, the second direction Y and the height direction Z of the battery cell 20 are perpendicular to each other.

[0097] The body 11 is the shell and support structure of the whole battery device, which can be made of materials with certain rigidity, such as steel, aluminum, etc., to improve reliability.

[0098] The plurality of battery cells 20 are arranged in the body 11 along the thickness direction (i.e. the first direction X) with their large faces (i.e. the largest surface) adhering to each other. The "end surface of the battery cell 20 in the first direction X" refers to the wall surface at both ends of the thickness direction of the battery cell 20, i.e. the large face.

[0099] The expansion beam 12 is a composite expansion beam with different rigidity, which is arranged in the body 11 and mainly used to resist the expansion force of the battery cell 20. Specifically, the expansion beam 12 includes a first beam 121 and a second beam 122, which can be firmly connected by welding, riveting, screwing or one-piece forming to form a whole load-bearing structure and bear force cooperatively. Due to the volume expansion of the battery cell 20 caused by electrode material expansion, electrolyte decomposition and other reasons during the charging and discharging process, especially after long-term cycling, the expansion force is mainly transmitted outward along the thickness direction of the battery cell 20 (i.e. the first direction X) and finally acts on the large face of the battery cell 20 along the thickness direction. Therefore, the first beam 121 and the second beam 122 of the expansion beam 12 are arranged to abut against the large face, that is, the first beam 121 and the second beam 122 are in contact with the large face. When the battery cell 20 expands, the expansion force acts on the structure of the first beam 121 and the second beam 122 through the large face. Since the first beam 121 has higher rigidity than the second beam 122, it can be used as the main load-bearing structure to bear the main compression force, and the second beam 122 with low rigidity can be used to assist in resisting the expansion force and also help to absorb impact and play a certain buffering role. The first beam 121 can be made of high-strength steel. The second beam 122 can be made of a material with relatively low rigidity, such as aluminum or aluminum alloy. In some examples, the rigidity of the first beam 121 and the second beam 122 can be determined by compression test. The cross-sectional shape of the first beam 121 and the second beam 122 can be square to closely abut against the large face of the battery cell 20, thereby ensuring the anti-expansion effect.

[0100] It can be understood that the first beam 121 as the high-rigidity part of the expansion beam 12 significantly improves the lower limit of the rigidity of the whole expansion beam 12. Moreover, the first beam 121 and the second beam 122 are arranged in a stacked manner along the height direction Z, which can increase the overall height of the expansion beam 12, thereby increasing the area of the large face covered by the expansion beam 12 and improving the anti-expansion capability. In addition, the space occupied in the arrangement direction of the battery cell 20 (i.e. the first direction X) can be reduced, thereby being conducive to improving the energy density of the battery device.

[0101] Therefore, compared with the traditional single-beam structure, the embodiment of the present application can improve the overall rigidity and anti-deformation capability of the expansion beam 12 by using the first beam 121 with higher rigidity in the expansion beam 12 and connecting it with the second beam 122 in a stacked manner along the height direction Z to form a composite beam structure, which can effectively suppress the expansion and deformation of the battery cell 20 and help to improve the energy density of the battery device.

[0102] In some embodiments, the expansion force abutting against the end face of the battery cell 20 at the first beam 121 is greater than the expansion force abutting against the end face of the battery cell 20 at the second beam 122.

[0103] In actual battery cell assemblies, the battery cells (especially square or soft-pack batteries) do not expand uniformly during the charging and discharging cycle, resulting in different expansion forces at different positions of the end face of the battery cell. At this time, by arranging the first beam 121 with high rigidity in the area with larger expansion force on the end face of the battery cell 20 and arranging the second beam 122 with low rigidity in the area with smaller expansion force, the structure of the expansion beam 12 is matched with the actual load distribution. This arrangement enables the first beam 121 to fully exert its high strength and high rigidity advantages, and effectively suppresses the deformation of the key area by mainly bearing the main expansion force; at the same time, the second beam 122 plays a supporting and stress relieving role in the low load area, avoiding excessive rigidity of the structure. As a result, the overall anti-expansion capability of the expansion beam 12 is strengthened in a targeted manner, the load transmission is more reasonable, and the structural stability and reliability of the battery device are significantly improved.

[0104] In some embodiments, as shown in FIGS. 1A and 1B, the first beam 121 corresponds to the middle part of the end face of the battery cell 20, and the second beam 122 corresponds to the edge of the end face of the battery cell 20. Figure 4 and Figure 5 In some embodiments, as shown in FIGS. 1A and 1B, the first beam 121 corresponds to the middle part of the end face of the battery cell 20, and the second beam 122 corresponds to the edge of the end face of the battery cell 20.

[0105] In actual battery cell assemblies, the battery cells 20 do not expand uniformly during the charging and discharging cycle, and the middle part of the end face (i.e., the large face) of the battery cell 20 usually has a larger expansion force than the edge, resulting in a "bulging" phenomenon when the end face expands. The "edge of the end face of the battery cell 20" refers to the upper or lower edge of the end face of the battery cell 20 in the height direction Z. Correspondingly, the "middle part of the end face of the battery cell 20" refers to the middle region of the end face of the battery cell 20 between the upper and lower edges in the height direction Z.

[0106] In actual battery cell assemblies, the battery cells 20 do not expand uniformly during the charging and discharging cycle, and the middle part of the end face (i.e., the large face) of the battery cell 20 usually has a larger expansion force than the edge, resulting in a "bulging" phenomenon when the end face expands. The "edge of the end face of the battery cell 20" refers to the upper or lower edge of the end face of the battery cell 20 in the height direction Z. Correspondingly, the "middle part of the end face of the battery cell 20" refers to the middle region of the end face of the battery cell 20 between the upper and lower edges in the height direction Z.

[0107] In some embodiments, as shown in FIGS. 1A and 1B, the first beam 121 corresponds to the middle part of the end face of the battery cell 20, and the second beam 122 corresponds to the edge of the end face of the battery cell 20. Figure 6 Figure 6 This is a second structural diagram of the expansion beam provided by the embodiments of the present application. The number of the second beam 122 of the embodiments of the present application is two, and the first beam 121 is connected between the two second beams 122.

[0108] ​As the expansion force in the middle of the end face of the battery cell 20 is greater than the expansion force in the upper and lower edge regions, this layout enables the first beam 121 with high rigidity to precisely correspond to the middle region with high load, thereby bearing the main expansion force, while the two second beams 122 with low rigidity correspond to the edge regions with low load, respectively, thereby providing adaptive support. In this way, while achieving full coverage of the end face of the battery cell 20, the distribution characteristics of the expansion force in the middle of the end face of the battery cell 20, which is high and low on both sides, are precisely matched, thereby significantly improving the anti-deformation capability and load transfer efficiency of the expansion beam 12, effectively inhibiting the non-uniform expansion of the battery cell 20, and improving the reliability of the battery device.

[0109] In some embodiments, referring to Figure 5 As shown, the contact area of the first beam 121 abutting against the end face of the battery cell 20 is greater than the contact area of the second beam 122 abutting against the end face of the battery cell 20.

[0110] As the first beam 121 has higher rigidity, by increasing the contact area, it covers the main region of the end face of the battery cell 20 with greater expansion force, thereby being able to bear a greater proportion of the expansion load, improving the compression resistance of the expansion beam 12 as a whole, and inhibiting the expansion deformation of the battery cell 20.

[0111] In some embodiments, referring to Figure 5 As shown, the height of the first beam 121 is greater than the height of the second beam 122.

[0112] By increasing the extension range of the high-rigidity first beam 121 in the height direction Z of the battery cell 20, it is able to cover more regions of the end face of the battery cell 20, thereby bearing a greater range of expansion load, which not only improves the bending stiffness and overall load-bearing capacity of the first beam 121, but also optimizes the transfer path of the expansion force, effectively inhibiting the expansion deformation of the battery cell 20. Optionally, the height of the first beam 121 is greater than one half of the height of the battery cell 20, and the height of the second beam 122 is less than one half of the height of the battery cell 20.

[0113] In some embodiments, referring to Figure 5 and Figure 9 As shown, the battery device 100 comprises a first fastening assembly 30, the first fastening assembly 30 comprising a first pull-rivet nut 301 and a first bolt 302; the first pull-rivet nut 301 is connected in the second beam 122, and the first bolt 302 is provided in the first beam 121 along the height direction Z and connected with the first pull-rivet nut 301.

[0114] The first beam 121 can be arranged above the second beam 122, and during assembly, the first rivet nut 301 can be rivet-fixed in the second beam 122, and the first bolt 302 can be penetrated through the beam body from the top of the first beam 121 downward and locked with the first rivet nut 301 in the second beam 122, to realize the compression connection in the vertical stacking direction (i.e., the height direction Z).

[0115] The first beam 121 can be arranged above the second beam 122, and during assembly, the first rivet nut 301 can be rivet-fixed in the second beam 122, and the first bolt 302 can be penetrated through the beam body from the top of the first beam 121 downward and locked with the first rivet nut 301 in the second beam 122, to realize the compression connection in the vertical stacking direction (i.e., the height direction Z).

[0116] In some embodiments, referring to FIG. 1, the battery device 100 includes a first fastening assembly 30, and the first fastening assembly 30 includes a first rivet nut 301 and a first bolt 302.

[0117] The second beam 122 can be arranged above the first beam 121, and during assembly, the first rivet nut 301 can be rivet-fixed in the first beam 121, and the first bolt 302 can be penetrated through the beam body from the top of the second beam 122 downward and locked with the first rivet nut 301 in the first beam 121, to realize the compression connection in the vertical stacking direction (i.e., the height direction Z).

[0118] The first beam 121 can be arranged above the second beam 122, and during assembly, the first rivet nut 301 can be rivet-fixed in the second beam 122, and the first bolt 302 can be penetrated through the beam body from the top of the first beam 121 downward and locked with the first rivet nut 301 in the second beam 122, to realize the compression connection in the vertical stacking direction (i.e., the height direction Z).

[0119] In some embodiments, referring to Figure 5 As shown in FIG. 1, the first fastening assembly 30 includes a first reinforcing member 303, and the first reinforcing member 303 is supported in the first beam 121 and / or the second beam 122 along the height direction Z.

[0120] The first reinforcing member 303 is supported in the corresponding beam body along the height direction Z, which means that the first reinforcing member 303 is arranged along the height direction Z, and the upper and lower ends of the first reinforcing member 303 are respectively abutted on the upper and lower inner walls of the beam body, to realize the support. The specific type of the first reinforcing member 303 in the embodiments of the present application is not particularly limited, which can be, for example, a reinforcing sleeve, a strut, a rib plate or the like. The first reinforcing member 303 can be made of a material with certain rigidity, such as steel, aluminum alloy or the like.

[0121] This embodiment of the application, by incorporating a first reinforcing member 303, can improve the compressive stiffness of the expansion beam 12 without increasing its external outline dimensions, effectively suppressing the risk of deformation of the beam under expansion force. Simultaneously, it avoids occupying internal space of the battery box, maximizing the preservation of installation space for the individual battery cells 20, which is beneficial for improving the energy density of the battery device.

[0122] In some embodiments, the first reinforcing member 303 may be arranged side by side with the first bolt 302 at a distance.

[0123] In other embodiments, reference is made to Figure 5 and Figure 9 As shown, the first reinforcing member 303 is sleeved on the first bolt 302. The first beam 121 includes a first end wall 1211 and a second end wall 1212 spaced from top to bottom in the height direction Z. The second beam 122 includes a third end wall 1221 adjacent to the second end wall 1212. The first bolt 302 passes through the upper surface of the first end wall 1211 into the first beam 121 and through the second end wall 1212 before being connected to the first rivet nut 301. The first reinforcing member 303 passes through the lower surface of the third end wall 1221 into the first beam 121 and abuts against the lower surface of the first end wall 1211.

[0124] The first bolt 302 and the first rivet nut 301 work together to achieve a stable connection between the first beam 121 and the second beam 122, thereby ensuring anti-expansion effect. In this embodiment, the first reinforcing member 303 can be a hollow tubular structure, such as a metal sleeve, a high-strength engineering plastic bushing, or a composite material tube. The first reinforcing member 303 is coaxially sleeved outside the first bolt 302 and supported along the height direction Z within the beam body where the first bolt 302 is located. It can serve as a guide sleeve or pressure-bearing bushing for the first bolt 302. The preload applied by the first bolt 302 is transmitted through the first reinforcing member 303, enabling the entire fastening assembly to achieve a dual function of locking and supporting.

[0125] When the first bolt 302 applies preload to lock the two beams, the beam material (especially aluminum alloy and thin steel plate) is prone to crushing or deformation under excessive local pressure below the bolt head or nut. To address this, by fitting the first reinforcing member 303 onto the first bolt 302, the rigidity of the beam at the connection can be increased, preventing crushing or deformation of the beam at the connection.

[0126] In some embodiments, refer to Figures 7 to 9 As shown, Figure 7 This is another assembly diagram of the battery cell and expansion beam provided in an embodiment of this application; Figure 8 for Figure 7 Sectional view at BB; Figure 9 for Figure 8The first reinforcing member 303 has a first end 3031 and a second end 3032 opposite to each other in the height direction Z, the first end 3031 is provided with a flange 3033, and the first reinforcing member 303 is provided with a guide channel 3034 extending along the height direction Z; the first end wall 1211 is provided with a first hole 1213, the second end wall 1212 is provided with a second hole 1214 corresponding to the first hole 1213, the first reinforcing member 303 is arranged in the second hole 1214 to the first beam 121, and the flange 3033 protrudes and is connected to one side edge of the second hole 1214 away from the first hole 1213, and the second end 3032 is connected to one side edge of the first hole 1213 towards the second hole 1214; the third end wall 1221 is provided with a third hole 1222 corresponding to the second hole 1214, and the first lock nut 301 is connected to the third hole 1222; the first bolt 302 is arranged in the first hole 1213 and the guide channel 3034, and is connected with the first lock nut 301.

[0127] The flange 3033 of the first reinforcing member 303 is a limiting shoulder protruding in the radial direction of the first bolt 302, which is used for quick positioning and installation of the first reinforcing member 303. The guide channel 3034 of the first reinforcing member 303 is used for guiding the first bolt 302 to be arranged, and has the functions of guiding and bearing force.

[0128] The first end wall 1211 above the first beam 121 is provided with a first hole 1213, and the second end wall 1212 below the first beam 121 is provided with a second hole 1214 corresponding to the first hole 1213 coaxially in the height direction Z, the first reinforcing member 303 is arranged in the second hole 1214 upwardly into the first beam 121, and the flange 3033 of the first end 3031 is connected to the outer side edge of the second hole 1214 to limit the position, and the connection mode of the flange 3033 and the second hole 1214 can be welding, clamping, gluing and the like. The second end 3032 of the first reinforcing member 303 is connected to the inner side edge of the first hole 1213, and the second end 3032 and the first hole 1213 can be in direct contact, or can be connected by welding, riveting, gluing and the like. Through the above arrangement, the installation stability of the first reinforcing member 303 in the first beam 121 can be ensured.

[0129] The third end wall 1221 above the second beam 122 is provided with a third hole 1222 corresponding to the first hole 1213 and the second hole 1214 of the first beam 121 coaxially, and the first lock nut 301 is fixed in the third hole 1222 as a bolt anchoring point.

[0130] As Figure 9As shown, during assembly, the first rivet nut 301 is riveted and fixed in the third hole 1222 of the third end wall 1221 of the second beam 122; the first reinforcing member 303 is inserted from the second hole 1214 of the second end wall 1212 below the first beam 121, the flange 3033 of the first end 3031 of the first reinforcing member 303 is clamped on the outer side edge of the second hole 1214, and the second end 3032 abuts the inner side edge of the first hole 1213; the first beam 121 and the second beam 122 are stacked along the height direction Z, and it is ensured that the guide channel 3034 of the first reinforcing member 303 is aligned with the first rivet nut 301; the first bolt 302 is inserted downward from the first hole 1213 of the first end wall 1211 above the first beam 121, passes through the guide channel 3034 of the first reinforcing member 303, and is screwed into the first rivet nut 301 in the second beam 122, and the connection is completed after tightening.

[0131] The embodiment of the present application can effectively improve the assembly efficiency and connection accuracy between the first beam 121 and the second beam 122, thereby guaranteeing the anti-expansion performance.

[0132] In some embodiments, referring to Figure 10 As shown, Figure 10 This is a third structural schematic diagram of the expansion beam provided by the embodiment of the present application. The battery device 100 of the embodiment of the present application comprises a second reinforcing member 40 connected to the first beam 121 and / or the second beam 122.

[0133] The second reinforcing member 40 of the embodiment of the present application can be installed on the outside or the inside of the corresponding beam body by welding, screwing, gluing or other connection methods. The material of the second reinforcing member 40 can be a high elastic modulus material, such as steel, titanium alloy or high-strength composite material, etc. Alternatively, the second reinforcing member 40 is square steel. The number of the second reinforcing member 40 can be one or more.

[0134] The embodiment of the present application can further improve the overall structural rigidity of the expansion beam 12 by providing the second reinforcing member 40 on the beam body, thereby improving the anti-expansion performance.

[0135] In some embodiments, referring to Figure 10 As shown, the second reinforcing member 40 is supported in the first beam 121 and / or the second beam 122 along the first direction X.

[0136] The second reinforcing member 40 being supported in the corresponding beam body along the first direction X means that one end of the second reinforcing member 40 abuts the left end inner wall of the beam body in the thickness direction (i.e. the first direction X), and the other end abuts the right end inner wall of the beam body in the thickness direction, realizing an embedded compression support structure. When the battery monomer 20 expands, the expansion force is transmitted to the end face along the thickness direction, and then to the beam body, which is borne by the built-in second reinforcing member 40.

[0137] The second reinforcing member 40 of the embodiment of the present application can serve as a force bearing pillar, can bear the thrust in the thickness direction generated by the expansion of the battery monomer 20, improve the compression stiffness and structural stability of the beam body in the expansion force direction, thereby effectively inhibiting the deformation risk of the beam body. Moreover, the second reinforcing member 40 is arranged in a built-in manner and is accommodated in the beam body, has a compact structure, does not occupy additional space in the battery box, maximizes the installation space of the battery monomer 20, and is beneficial to improving the energy density of the battery device.

[0138] In some embodiments, referring to Figure 10 , the second reinforcing member 40 in the first beam 121 is located at the middle part of the first beam 121.

[0139] Since the middle part of the end face of the battery monomer 20 bears greater expansion force during charging and discharging. Therefore, the embodiment of the present application correspondingly arranges the second reinforcing member 40 at the high-stress middle part position of the first beam 121, directly opposite the middle part region of the end face of the battery monomer 20 which expands violently, can specifically enhance the structural stiffness and deformation resistance of the region.

[0140] In some embodiments, referring to Figure 8 and Figure 11 , as shown in Figure 11 , the local enlarged view of D of Figure 8 , the body 11 of the embodiment of the present application includes a bottom wall 1121, and the second beam 122 located below the first beam 121 is connected to the bottom wall 1121.

[0141] The bottom plate 112 of the body 11 includes a bottom wall 1121, and the second beam 122 can be connected to the bottom wall 1121 in a connection manner such as welding, screwing, clamping, etc. As an example, as shown in Figure 11 , the battery device 100 includes a second fastening assembly 50, and the second fastening assembly 50 includes a second rivet nut 501 and a second bolt 502; the second rivet nut 501 is rivet-fixed at the bottom of the second beam 122, and the second bolt 502 is arranged in the bottom wall 1121 from below to above along the height direction Z and is connected with the second rivet nut 501.

[0142] The embodiment of the present application fixes the second beam 122 to the bottom wall 1121, which can provide a stable installation anchor point for the entire expansion beam 12 structure, significantly improve the positioning accuracy and structural stability in the assembly process. This setting effectively prevents the sliding, overturning or loosening of the expansion beam 12 under the action of the battery expansion force, ensures the reliable connection between the expansion beam 12 and the battery box. At the same time, the bottom wall 1121 serves as the terminal support for force transmission, enabling the expansion load to be efficiently conducted along the path of “first beam 121 to second beam 122 to bottom wall 1121 to frame and top cover 111”, improving the overall compression capacity and structural reliability.

[0143] In some embodiments, the body 11 comprises two side walls (not shown in the figure) opposite in the second direction Y, which are connected to the bottom wall 1121; at least one end of the first beam 121 in the extension direction is connected to at least one side wall, and / or at least one end of the second beam 122 in the extension direction is connected to at least one side wall.

[0144] The frame of the body 11 comprises side walls, and the extension direction of the beam body is the second direction Y. The side end of the beam body can be connected to the corresponding side wall by welding, screwing, clamping, etc. In combination with the connection of the beam body and the bottom wall 1121, multi-point fixation can be achieved, further enhancing the assembly stability of the expansion beam 12, effectively preventing the beam body from moving under the expansion force of the battery monomer 20, thereby ensuring the anti-deformation capability of the expansion beam 12.

[0145] In some embodiments, the first beam 121 is a steel beam, and / or the second beam 122 is an aluminum beam.

[0146] By using high-rigidity steel material for the first beam 121 that bears the main expansion force, the excellent mechanical properties of the steel material are fully utilized, significantly improving the anti-deformation capability of the expansion beam 12 in the key area. At the same time, lightweight aluminum material is used for the second beam 122 that provides auxiliary support, which reduces the overall structure weight under the premise of meeting the basic support function. Compared with the expansion beam 12 made of all aluminum material, the present application has higher structural rigidity while reducing material cost; compared with the expansion beam 12 made of all steel material, the present application reduces the overall weight while ensuring rigidity performance.

[0147] In some embodiments, the number of expansion beams 12 is at least two, and the battery monomer 20 is arranged between each adjacent two expansion beams 12.

[0148] For example, the number of expansion beams 12 is two, and the plurality of battery monomers 20 is arranged between the two expansion beams 12. Specifically, the plurality of battery monomers 20 is arranged into a battery monomer assembly along the first direction X, and the two expansion beams 12 are arranged at the two ends of the battery monomer assembly respectively for clamping the battery monomer assembly. When the battery monomer 20 expands, the thrust is transmitted to the expansion beams 12 at the two ends respectively, which resists expansion through the expansion beams 12, thereby preventing the battery monomer from deforming.

[0149] When the number of battery monomers 20 is larger, the generated expansion force is larger, at which time the expansion beam 12 can also be arranged in the middle of the battery monomer assembly to improve the anti-expansion effect, as shown in Figure 3 and Figure 7 .

[0150] Therefore, the embodiments of the present application can flexibly configure the expansion beam 12 structure according to the number of battery monomers 20, and ensure the structural stability and anti-expansion reliability of the battery monomer assembly at different scales.

[0151] In some embodiments, referring to Figure 3 and Figure 7 As shown in the drawings, the battery device 100 includes a plurality of battery cell assemblies arranged along the second direction Y, and each battery cell assembly includes a plurality of battery cells 20 arranged along the first direction X; the expansion beam 12 is arranged along the second direction Y, and the expansion beam 12 can correspondingly abut the middle, end, or the like of the plurality of battery cell assemblies in the first direction X, so that the effect of simultaneously resisting expansion of the plurality of battery cell assemblies can be achieved, and the structure is compact. In addition, a plurality of first fastening assemblies 30 and a plurality of second fastening assemblies 50 can be arranged on the expansion beam 12 along the extension direction thereof, further improving the overall rigidity and structural stability of the expansion beam 12, thereby improving the anti-deformation performance.

[0152] In some embodiments, the application also provides a power utilization device, comprising the battery device 100 of any of the above embodiments, and the battery device 100 is used to provide power for the power utilization device.

[0153] The power utilization device can be a device or system of any of the above applications of the battery device 100.

[0154] The above is only a preferred embodiment of the application, and is not intended to limit the embodiments of the application. Any modifications, equivalent replacements and improvements made within the spirit and principle of the embodiments of the application shall be included in the protection scope of the embodiments of the application. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a box body comprising a main body and an expansion beam; a plurality of battery cells arranged in the main body along a first direction; the expansion beam comprises a first beam and a second beam arranged in the main body, the first beam and the second beam are stacked along the height direction of the battery cells and connected to each other, the first beam and the second beam abut the end surface of the battery cell in the first direction, and the rigidity of the first beam is greater than that of the second beam.

2. The battery device according to claim 1, characterized by The expansion force of the first beam at the end surface of the battery cell is greater than that of the second beam at the end surface of the battery cell.

3. The battery device of claim 2, wherein, The first beam corresponds to the middle part of the end surface of the battery cell, and the second beam corresponds to the edge of the end surface of the battery cell.

4. The battery device of claim 3, wherein The number of the second beam is two, and the first beam is connected between the two second beams.

5. The battery device according to any one of claims 1 to 4, characterized by, The contact area of the first beam abutting the end surface of the battery cell is greater than that of the second beam abutting the end surface of the battery cell.

6. The battery device of claim 5, wherein, The height of the first beam is greater than that of the second beam.

7. The battery device according to any one of claims 1 to 3, characterized by, The battery device comprises a first fastening assembly, the first fastening assembly comprises a first rivet nut and a first bolt; the first rivet nut is connected in the second beam, and the first bolt is arranged in the first beam along the height direction and connected with the first rivet nut; or, the first rivet nut is connected in the first beam, and the first bolt is arranged in the second beam along the height direction and connected with the first rivet nut.

8. The battery device of claim 7, wherein, The first fastening assembly comprises a first reinforcing member, and the first reinforcing member is supported in the first beam and / or the second beam along the height direction.

9. The battery device of claim 8, wherein, The first reinforcing member is sleeved on the first bolt, the first beam comprises a first end wall and a second end wall spaced apart in the height direction from top to bottom, the second beam comprises a third end wall adjacent to the second end wall, the first bolt is connected with the first rivet nut after being penetrated into the first beam from the upper surface of the first end wall and penetrating through the second end wall, and the first reinforcing member is penetrated into the first beam from the lower surface of the third end wall and abuts against the lower surface of the first end wall.

10. The battery device of claim 9, wherein, The first reinforcing member has a first end and a second end opposite in the height direction, the first end is provided with a flange, and the first reinforcing member is provided with a guide channel extending in the height direction; the first end wall is provided with a first hole, the second end wall is provided with a second hole corresponding to the first hole, the first reinforcing member is arranged in the second hole to the first beam, and the flange protrudes and is connected to one side edge of the second hole away from the first hole, and the second end is connected to one side edge of the first hole toward the second hole; the third end wall is provided with a third hole corresponding to the second hole, and the first rivet nut is connected to the third hole; the first bolt is arranged in the first hole and the guide channel and connected with the first rivet nut.

11. The battery device according to any one of claims 1 to 4, characterized by, The battery device comprises a second reinforcing member, and the second reinforcing member is supported in the first beam and / or the second beam along the first direction.

12. The battery device of claim 11, wherein, The second reinforcing member in the first beam is located in the middle of the first beam.

13. The battery device according to any one of claims 1 to 4, characterized by, The body comprises a bottom wall, and the second beam located below the first beam is connected to the bottom wall.

14. The battery device of claim 13, wherein, The body comprises two side walls opposite in a second direction, and the side walls are connected to the bottom wall; at least one end of the first beam in the extending direction is connected to at least one of the side walls, and / or at least one end of the second beam in the extending direction is connected to at least one of the side walls; wherein the first direction and the second direction are perpendicular to each other.

15. The battery device according to any one of claims 1 to 4, characterized by, The first beam is a steel beam, and / or the second beam is an aluminum beam.

16. The battery device of any one of claims 1 to 4, wherein, The number of the expansion beams is at least two, and the battery cell is arranged between each adjacent two expansion beams.

17. An electrical device, comprising: The battery device comprises: The battery device according to any one of claims 1 to 16, wherein the battery device is used to provide electric energy.

18. A case, characterized by The battery device comprises a body and an expansion beam, the body is used to accommodate a plurality of battery cells arranged in a first direction, the expansion beam comprises a first beam and a second beam arranged in the body, the first beam and the second beam are stacked in the height direction of the battery cell and connected to each other, the first beam and the second beam are used to abut the end face of the battery cell in the first direction, and the rigidity of the first beam is greater than that of the second beam.

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