Battery device and electric device

Abstract

The battery device comprises a box body and a battery monomer assembly, the battery monomer assembly is arranged in the box body, the box body comprises a first beam and a hanging beam, the first beam is located on one side of the battery monomer assembly in the first direction, the first beam is provided with an open groove, the open groove is provided with an opening, and the hanging beam is arranged in the open groove. The opening faces the inner side of the box body in the first direction, the first beam comprises a first side wall part, the first side wall part is used for defining an open groove, and the first side wall part is arranged opposite to the opening in the first direction; the mounting beam is located on the side, facing the outside of the box body in the first direction, of the first beam and is connected with the first side wall part in a welded mode. According to the battery device, when the first beam and the mounting beam are welded, the welding difficulty is low, and the welding efficiency is high.

Description

Battery devices and electrical appliances Technical Field

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

[0002] The battery pack housing is a beam structure, and the mounting beam is fixed to the first beam by welding. However, the structure of the first beam in related technologies makes welding between the mounting beam and the first beam difficult and inefficient. Therefore, improvements are needed. Summary of the Invention

[0003] In view of the above problems, this utility model provides a battery device and an electrical device, which have low welding difficulty and high welding efficiency between the mounting beam and the first beam.

[0004] In a first aspect, this utility model provides a battery device, including a housing and a battery cell assembly, the battery cell assembly being disposed within the housing, a first beam of the housing and a mounting beam, the first beam being located on one side of the battery cell assembly along a first direction, the first beam having a slot with an opening, the opening facing the inner side of the housing along the first direction, the first beam including a first sidewall portion for enclosing the slot, the first sidewall portion being disposed opposite to the opening along the first direction; the mounting beam being located on the side of the first beam facing the outer side of the housing along the first direction, the mounting beam being welded to the first sidewall portion.

[0005] In the above technical solution, a slot is provided on the first beam, and the opening of the slot faces the inner side of the box along the first direction. The first beam includes a first side wall portion, which is used to enclose the slot and is arranged opposite to the opening. The mounting beam is located on the side of the first beam facing the outside of the box. The slot is used to avoid the operation space for welding the mounting beam and the first side wall portion. When the mounting beam and the first side wall portion are welded together, the space operation generated by the slot can be avoided, which helps to reduce the welding difficulty and improve the welding efficiency.

[0006] In some embodiments, the first beam further includes a second sidewall portion and a third sidewall portion, the second sidewall portion and the third sidewall portion being respectively connected to both sides of the first sidewall portion along the height direction of the first beam, the first sidewall portion, the second sidewall portion and the third sidewall portion together enclosing the slot, the thickness of the first sidewall portion being greater than the thickness of the second sidewall portion, and the thickness of the first sidewall portion being greater than the thickness of the third sidewall portion.

[0007] In the above technical solution, the second sidewall and the third sidewall are respectively connected to the two sides of the first sidewall along the height direction of the first beam. The first sidewall, the second sidewall, and the third sidewall together enclose the slot, so that the slot forms an opening structure facing the inner side of the box along the first direction. The opening facilitates welding operations and reduces welding difficulty. The thickness of the first sidewall is greater than the thickness of the second sidewall, and the thickness of the first sidewall is greater than the thickness of the third sidewall, which increases the structural strength of the first beam in the height direction and reduces the weakening of the strength of the first beam in the height direction due to the setting of the slot.

[0008] In some embodiments, the mounting beam includes a mounting portion and a first flange edge connected to the mounting portion. The first flange edge and the mounting portion are disposed along the height direction of the first beam, and the first flange edge is fitted and welded to the first sidewall portion.

[0009] In the above technical solution, the first flange edge is fitted with the first sidewall portion to form a layered structure, which ensures stable weld nugget quality; the fitting of the first flange edge with the first sidewall portion can also reduce gaps and improve welding quality; the fitting of the first flange edge with the first sidewall portion increases the operating area during welding, which facilitates welding operations.

[0010] In some embodiments, the first beam is further provided with a first cavity, and the first cavity and the slot are arranged along the height direction of the first beam.

[0011] In the above technical solution, a first cavity is set along the height direction of the first beam. The first cavity retains strength and rigidity while being lightweight, which is especially suitable for scenarios that need to balance "sturdiness" and "lightness". The air layer can block heat conduction and reduce noise. The hollow structure reduces the amount of material used, realizing "replacing materials with structure".

[0012] In some embodiments, the first beam is further provided with a second cavity, and the slot is located between the first cavity and the second cavity along the height direction of the first beam.

[0013] In the above technical solution, by setting a second cavity, strength and rigidity are retained under the premise of lightweighting, which is especially suitable for scenarios that need to balance "robustness" and "lightness". The air layer can block heat conduction and reduce noise. The hollow structure reduces the amount of material used, realizing "replacing materials with structure". Along the height direction of the first beam, the slot is located between the first cavity and the second cavity. When the two cavities are subjected to external forces (such as compression, temperature difference deformation), they will each generate independent deformation trends, protecting the welded part between the flange edge and the first side wall and reducing the risk of welded part breakage.

[0014] In some embodiments, the mounting beam includes a mounting portion and a second flange edge connected to the mounting portion. The mounting portion and the second flange edge are arranged along the height direction of the first beam. The first beam also includes a third outer plate portion, which is used to enclose the second cavity. The third outer plate portion is located on the side of the second cavity near the outside of the box body along the first direction. The second flange edge is welded to the third outer plate portion.

[0015] In the above technical solution, the second flange edge is welded to the third outer plate, so that in addition to being welded to the first side wall, the mounting beam is also welded to the third outer plate, which enhances the connection strength between the mounting beam and the first beam.

[0016] In some embodiments, the first beam further includes a third inner plate portion for enclosing the second cavity, the third inner plate portion and the third outer plate portion being disposed opposite each other along the first direction, the third inner plate portion being provided with a through hole, at least a portion of the through hole being disposed opposite to the second flange edge.

[0017] In the above technical solution, the third inner plate is provided with a through hole, which is used to avoid the operating space for welding the second flange edge and the third outer plate. The welding gun can be inserted into the through hole, so that the welding electrode clamps the second flange edge and the third outer plate for welding, which helps to reduce the welding difficulty and improve the welding efficiency.

[0018] In some embodiments, the diameter of the through hole is 3-10 mm.

[0019] In the above technical solution, the commonly used size of the electrode head for thin-wall welding is 3mm to 5mm. When the diameter of the through hole is 3-10mm, the electrode head for welding can be inserted into the through hole, clamp the third outer plate, and perform welding.

[0020] In some embodiments, the first beam includes an outer plate and an inner plate. The inner plate is located on the side of the outer plate close to the box body along the first direction. The inner plate includes a first inner plate portion, a second inner plate portion, and a third inner plate portion arranged sequentially along the height direction of the first beam. The second inner plate portion is recessed towards the outside of the box body to form the slot. The outer plate includes a first outer plate portion, a second outer plate portion, and a third outer plate portion arranged sequentially along the height direction of the first beam. The second inner plate portion includes a bonding plate. The bonding plate is arranged along the height direction of the first beam and is bonded to the second outer plate portion to form the first sidewall portion. The second outer plate portion is located between the bonding plate and the mounting beam. The first outer plate portion and the first inner plate portion are arranged opposite to each other along the first direction and both form the sidewall of the first cavity. The third outer plate portion and the third inner plate portion are arranged opposite to each other along the first direction and both form the sidewall of the second cavity.

[0021] In the above technical solution, the first beam includes an outer plate and an inner plate. The second inner plate is recessed towards the outside of the box to form a slot. This structural design enables the first beam to be manufactured by roll forming. Roll forming is a high-efficiency production process, suitable for mass production, with high product precision, good dimensional consistency, high material utilization, and low overall cost. It can also optimize material performance and improve product reliability.

[0022] In some embodiments, the welded portion formed by welding the mounting beam to the first sidewall portion is formed by melting and solidifying a portion of the second outer plate portion, a portion of the bonding plate, and a portion of the mounting beam.

[0023] In the above technical solution, the welding part is formed by melting and solidifying a portion of the second outer plate, a portion of the bonding plate, and a portion of the mounting beam. This allows the second outer plate to be welded to the mounting beam while simultaneously welding the second outer plate to the bonding plate, thereby enhancing the overall structural strength of the first beam. Furthermore, the second outer plate, the bonding plate, and the mounting beam can be welded simultaneously in one operation, improving the manufacturing efficiency of the box.

[0024] In some embodiments, the battery device further includes a reinforcing beam connected to the first beam, and at least a portion of the reinforcing beam is located in the slot.

[0025] In the above technical solution, the reinforcing beam connects to the first beam, and at least part of the reinforcing beam is located in the slot. The reinforcing beam solves the problem of reduced structural strength of the first beam due to the formation of the slot, and enhances the structural strength of the first beam.

[0026] In some embodiments, a third cavity is formed inside the reinforcing beam.

[0027] In the above technical solution, a third cavity is formed inside the reinforced beam. The third cavity retains strength and stiffness while being lightweight, making it particularly suitable for scenarios that require a balance between "robustness" and "lightness". The air layer can block heat conduction and reduce noise. The hollow structure reduces the amount of material used, realizing "replacing materials with structure".

[0028] In some embodiments, the reinforcing beam includes a body and a support plate. The body has a third cavity, the support plate is located in the third cavity and is arranged along the height direction of the first beam, and the two ends of the support plate along the height direction of the first beam are fixedly connected to the body.

[0029] In the above technical solution, the support plate is located in the third cavity and is set along the height direction of the first beam. The support plate increases the structural strength of the reinforcing beam and solves the problem of reduced structural strength in the vertical direction caused by the formation of slots.

[0030] In some embodiments, the difference between the dimension of the slot along the height direction of the first beam and the dimension of the reinforcing beam along the height direction of the first beam is in the range of 0.5-1 mm.

[0031] In the above technical solution, the slot and the reinforcing beam are fitted with a clearance. The clearance can absorb the assembly tolerance of the reinforcing beam and the first beam, and reduce the machining dimensional accuracy requirements of the reinforcing beam and the first beam.

[0032] In some embodiments, along the first direction, the first beam protrudes into the housing relative to the reinforcing beam, and the first beam abuts against the battery cell assembly.

[0033] In the above technical solution, the first beam protrudes into the box relative to the reinforcing beam. When the battery device is hit by a collision from the outside of the box, the impact force first acts on the first beam, and then acts on the reinforcing beam after the first beam is partially deformed. The first beam and the reinforcing beam are crushed in a progressive manner, which effectively extends the energy absorption time.

[0034] In some embodiments, the first beam is formed by bending a metal plate structure.

[0035] In the above technical solution, the first beam is formed by bending a metal plate structure, resulting in high overall structural strength. The first beam, formed by bending a metal plate structure, can be bent and formed using a roll forming process. The roll forming process has high production efficiency, is suitable for large-scale mass production, produces high-precision products with good dimensional consistency, high material utilization, and low overall cost. Furthermore, it can optimize material performance and improve product reliability.

[0036] In some embodiments, at least a portion of the outer surface of the first beam is covered with an anti-corrosion layer.

[0037] In the above technical solution, by covering the outer surface of the first beam with an anti-corrosion layer, the anti-corrosion layer completely isolates the internal material of the first beam from external oxygen, moisture and corrosive media, thus preventing the occurrence of corrosion reaction.

[0038] Secondly, the present invention provides an electrical device, including a battery device according to an embodiment of the first aspect of the present invention.

[0039] In the above technical solution, the electrical device includes a battery device according to the first aspect of the present invention. A slot is provided on a first beam, the opening of which faces the inner side of the housing in a first direction. The first beam includes a first side wall portion for enclosing the slot, and the first side wall portion is disposed opposite to the opening. A mounting beam is located on the side of the first beam facing the outside of the housing. The slot is used to avoid the operating space for welding the mounting beam to the first side wall portion. When the mounting beam is welded to the first side wall portion, the space created by the slot can be avoided, which helps to reduce the welding difficulty and improve the welding efficiency.

[0040] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0041] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0042] Figure 1 is a schematic diagram of a battery device according to some embodiments of the present invention;

[0043] Figure 2 is a partial three-dimensional view of the battery device housing in Figure 1;

[0044] Figure 3 is a cross-sectional view of the assembly process of the box in Figure 2;

[0045] Figure 4 is an enlarged view of section A of the box in Figure 3;

[0046] Figure 5 is a partial structural exploded view of Figure 2;

[0047] Figure 6 is a partial structural exploded view of the box in Figure 2 from another perspective;

[0048] Figure 7 is a partial three-dimensional view of the box structure in Figure 2;

[0049] Figure 8 is a partial structural cross-sectional view of the box in Figure 7;

[0050] Figure 9 is a schematic diagram of an electrical device according to some embodiments of the present invention.

[0051] Figure label:

[0052] 1000. Electrical appliances;

[0053] 100. Battery device;

[0054] 11. First beam; 110. First cavity; 111. Groove; 1110. Opening; 1111. First sidewall; 1112. Second sidewall; 1113. Third sidewall; 112. Second cavity; 1121. Third outer plate; 1122. Third inner plate; 113. Outer plate; 1130. First outer plate; 1131. Second outer plate; 114. Top plate; 115. First inner plate; 116. Second inner plate; 117. Laminating plate; 118. Inner plate; 1191. Through hole; 1192. Bottom plate;

[0055] 12. Mounting beam; 120. Mounting section; 121. First flange edge; 122. Second flange edge;

[0056] 13. Reinforcing beam; 130. Body; 1301. Third cavity; 131. Support plate; 14. Side beam; 15. Welded part;

[0057] 20. Battery cell modules;

[0058] 30. Box; 31. First box; 32. Second box;

[0059] 200. Vehicle body. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0061] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order or hierarchy.

[0062] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments.

[0063] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "attachment," and "attachment" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0064] In this invention, 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, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0065] In the embodiments of this utility model, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this utility model shown in the drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this utility model.

[0066] In this utility model, "multiple" refers to two or more.

[0067] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0068] In the embodiments of this utility model, unless otherwise specified, all embodiments and optional embodiments of this utility model can be combined with each other to form new technical solutions.

[0069] In the embodiments of this utility model, unless otherwise specified, all technical features and optional technical features of this utility model can be combined with each other to form new technical solutions.

[0070] In embodiments of this invention, the battery device may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar. For example, a battery cell assembly is typically formed by arranging multiple battery cells; a battery cell assembly may also be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module may be formed by bundling multiple battery cells together with cable ties.

[0071] The battery device can be a battery pack, which includes a housing and one or more individual battery cells housed within the housing. The individual battery cells can be battery modules, which can be housed within the housing by fixing the battery modules to the housing; alternatively, multiple individual battery cells can be housed within the housing by directly fixing them to the housing.

[0072] In embodiments of this application, the housing may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing for housing individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or unsealed. The first housing may be a top cover or a bottom plate. For example, the housing may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, forming a closed space inside the housing for housing individual battery cells.

[0073] In embodiments of this application, the housing can be part of the vehicle's chassis structure. For example, a portion of the housing can be at least a part of the vehicle's floor, or a portion of the housing can be at least a part of the vehicle's crossbeams and longitudinal beams.

[0074] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0075] The battery pack housing has a beam structure, and the mounting beam is fixed to the first beam by welding. In related technologies, the structure of the first beam makes welding between the mounting beam and the first beam difficult and inefficient.

[0076] To reduce the welding difficulty and improve welding efficiency between the mounting beam and the first beam, this application provides a battery device including a housing and a battery cell assembly. The battery cell assembly is disposed inside the housing. The housing includes a first beam and a mounting beam. The first beam is located on one side of the battery cell assembly along a first direction. The first beam has a slot with an opening facing the inside of the housing along the first direction. The first beam includes a first sidewall portion for enclosing the slot. The first sidewall portion is disposed opposite to the opening along the first direction. The mounting beam is located on the side of the first beam facing the outside of the housing along the first direction, and the mounting beam is welded to the first sidewall portion.

[0077] In the above technical solution, a slot is provided on the first beam, and the opening of the slot faces the inner side of the box along the first direction. The first beam includes a first side wall portion, which is used to enclose the slot and is arranged opposite to the opening. The mounting beam is located on the side of the first beam facing the outside of the box. The slot is used to avoid the operation space for welding the mounting beam and the first side wall portion. When the mounting beam and the first side wall portion are welded together, the space operation generated by the slot can be avoided, which helps to reduce the welding difficulty and improve the welding efficiency.

[0078] The slotted design of the first beam reduces the difficulty of welding the first beam to the mounting beam and improves welding efficiency.

[0079] The battery device disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0080] The electrical devices disclosed in this application can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device is installed inside the vehicle, and the battery device can be located at the bottom, front, or rear of the vehicle. The battery device can be used to power the vehicle; for example, the battery device can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery device to supply power to the motor, for example, for the vehicle's starting, navigation, and operating power needs. In some embodiments of this application, the battery device can not only serve as the vehicle's operating power source but also as the vehicle's drive power source, replacing or partially replacing gasoline or natural gas to provide driving power for the vehicle.

[0081] The battery device and power supply device according to embodiments of the present invention are described below with reference to Figures 1-9.

[0082] Referring to Figures 1-4, in a first aspect, this utility model provides a battery device 100, including a housing 30 and a battery cell assembly 20. The battery cell assembly 20 is disposed inside the housing 30. The housing 30 includes a first beam 11 and a mounting beam 12. The first beam 11 is located on one side of the battery cell assembly 20 along a first direction. The first beam 11 has a slot 111 with an opening 1110. The opening 1110 faces the inside of the housing 30 along the first direction. The first beam 11 includes a first sidewall portion 1111, which is used to enclose the slot 111. The first sidewall portion 1111 is disposed opposite to the opening 1110 along the first direction. The mounting beam 12 is located on the side of the first beam 11 facing the outside of the housing 30 along the first direction. The mounting beam 12 is welded to the first sidewall portion 1111.

[0083] The housing 30 is used to house the battery cell assembly 20. The housing 30 can be a split structure.

[0084] For example, referring to Figure 1, the housing 30 includes a first housing 31 and a second housing 32. The first housing 31 and the second housing 32 are fastened together, so that the interior of the housing 30 forms a closed space to accommodate the battery cell assembly 20.

[0085] The box body 30 may also include side beams 14.

[0086] For example, referring to Figure 2, there are two side beams 14. There are also two first beams 11. The two first beams 11 and the two side beams 14 together form a frame structure, which is used to form the frame of the box 30.

[0087] The mounting beam 12 is used to fix the battery device 100 and to transfer loads.

[0088] For example, when the electrical device 1000 is a car, the mounting beam 12 connects the battery pack 30 to the vehicle body (such as the frame or chassis longitudinal beams), fixing the entire battery pack 100 to the vehicle body using bolts, welding, or other methods. This reduces the displacement and shaking of the battery pack 100 during vehicle movement (acceleration, braking, turning) or bumps. The longitudinal (acceleration / braking), lateral (turning), and vertical (bumps) loads generated during vehicle movement, as well as the impact loads during collisions, are all transferred to the vehicle frame through the mounting beam 12, reducing the risk of the battery pack 100 being damaged by direct stress concentration. In the event of a frontal, side, or bottom collision, the mounting beam 12 acts as an "energy-absorbing / impact-resistant structure," dispersing the collision force and reducing the risk of the battery cell assembly 20 being squeezed or punctured, as well as the probability of short circuits and fires. The mounting beam 12 is welded and fixed to the first beam 11 to form an integral structure, improving the overall rigidity and torsional resistance of the battery pack 100.

[0089] As shown in Figure 6, the first sidewall portion 1111 extends along the Z direction, which is the height direction of the first beam 11. The width direction of the first beam 11 is the X direction, i.e., the first direction; the length direction of the first beam 11 is the Y direction. The opening 1110 faces the inside of the box 30 along the first direction, i.e., the opening 1110 is in the X direction and faces the inside of the box 30.

[0090] The mounting beam 12 is welded to the first side wall 1111, eliminating the need for additional processes such as punching, tapping, or welding nuts. The mounting beam 12 and the first side wall 1111 can be connected by spot welding or arc welding.

[0091] For example, the mounting beam 12 is spot-welded to the first side wall portion 1111. Spot welding is a resistance welding process that utilizes the resistance heat generated by current passing through the contact point of two workpieces to heat the metal at the contact point to a molten or plastic state, and then applies pressure through electrodes to fuse the workpieces together to form a welded part. The core heating temperature of spot welding is concentrated in the molten nugget area at the workpiece contact point, typically between 910℃ and 1410℃ (depending on the base material). The heat is highly concentrated at the contact point (molten nugget area), and the temperature drops rapidly with distance from the molten nugget (the temperature of the heat-affected zone is typically between 200℃ and 100℃). Therefore, the thermal deformation of spot welding is minimal; the temperature of spot welding is much lower than that of arc welding.

[0092] The slot 111 is used to avoid the operating space for welding the mounting beam 12 to the first side wall portion 1111.

[0093] For example, when the mounting beam 12 and the first side wall portion 1111 are connected by spot welding, the opening 1110 of the slot 111 faces the inside of the housing 30 along the first direction. The welding gun can extend into the first beam 11 from the inside through the slot 111, so that the welding electrode clamps the mounting beam 12 and the first side wall portion 1111 for spot welding, without the need for additional punching, tapping, or welding nuts. Spot welding has concentrated heating, short time, and small heat-affected zone. The heat-affected zone of resistance spot welding is only 3-5mm; the heat-affected zone of arc welding is large (>20mm), which easily leads to annealing and softening of high-strength steel, and the strength loss can reach 30-40%. The spot welding of the mounting beam 12 and the first beam 11 has high welding quality, improving the reliability of the battery device 100; the cycle of a single welding part is only 0.1-0.5 seconds, and general welding machines can reach 60 points per minute, while high-speed models can reach more than 100 points per minute. Multiple welding parts can be welded simultaneously, significantly improving production capacity. Spot welding has high instantaneous power consumption but low total energy consumption. Spot welding can be monitored online through dynamic current feedback and electrode displacement monitoring, and welding quality data can be traced.

[0094] In the above technical solution, a slot 111 is provided on the first beam 11, and the opening 1110 of the slot 111 faces the inner side of the box 30 along the first direction. The first beam 11 includes a first side wall portion 1111, which is used to enclose the slot 111. The first side wall portion 1111 and the opening 1110 are arranged opposite to each other. The mounting beam 12 is located on the side of the first beam 11 facing the outside of the box 30. The slot 111 is used to avoid the operating space for welding the mounting beam 12 and the first side wall portion 1111. The welding gun can be inserted into the slot 111 to perform welding, which reduces the welding difficulty and improves the welding efficiency.

[0095] In some embodiments, referring to FIG3 and FIG4, the sidewall of the slot 111 further includes a second sidewall portion 1112 and a third sidewall portion 1113, the second sidewall portion 1112 and the third sidewall portion 1113 being respectively connected to both sides of the first sidewall portion 1111 along the height direction of the first beam 11, the thickness of the first sidewall portion 1111 being greater than the thickness of the second sidewall portion 1112, and the thickness of the first sidewall portion 1111 being greater than the thickness of the third sidewall portion 1113.

[0096] For example, as shown in Figure 4, the second sidewall portion 1112 forms the top wall of the slot 111, and the third sidewall portion 1113 forms the bottom wall of the slot 111.

[0097] In the above technical solution, since the height dimension of the slot 111 is set in the height direction of the first beam 11, the stiffness of the first beam 11 in the height direction will be reduced after the slot 111 is set. The thickness of the first side wall portion 1111 is greater than the thickness of the second side wall portion 1112 and the thickness of the first side wall portion 1111 is greater than the thickness of the third side wall portion 1113, thereby increasing the structural strength of the first beam 11 in the height direction and reducing the weakening of the strength of the first beam 11 in the height direction caused by the setting of the slot 111.

[0098] In some embodiments, referring to Figures 3 and 4, the mounting beam 12 includes a mounting portion 120 and a first flange edge 121 connected to the mounting portion 120. The first flange edge 121 and the mounting portion 120 are arranged along the height direction of the first beam 11. The first flange edge 121 is fitted and welded to the first sidewall portion 1111.

[0099] The first flange edge 121 can be a flat plate structure. The flat plate structure can increase the contact area between the first flange edge 121 and the first side wall portion 1111, thereby increasing the operable area for welding.

[0100] The first sidewall portion 1111 can also be a flat plate structure, which increases the contact area between the first flange edge 121 and the first sidewall portion 1111, thereby increasing the operable area for welding. At the same time, the flat plate structure makes the first flange edge 121 and the first sidewall portion 1111 fit more tightly, reducing gaps and lowering the probability of incomplete welding.

[0101] In the above technical solution, the first flange edge 121 is fitted with the first side wall portion 1111 to form a layered structure, which ensures stable weld nugget quality; the fitting of the first flange edge 121 with the first side wall portion 1111 can also reduce gaps and improve welding quality; the fitting of the first flange edge 121 with the first side wall portion 1111 increases the operating area during welding, which facilitates welding operations.

[0102] In some embodiments, referring to FIG3, the first beam 11 is further provided with a first cavity 110, and the first cavity 110 and the slot 111 are arranged along the height direction of the first beam 11.

[0103] For example, referring to Figure 4, the second sidewall portion 1112 of the slot 111 forms the bottom wall of the first cavity 110. Referring to Figure 5, the top wall of the first cavity 110 is a top plate 114, which is positioned opposite to the second sidewall portion 1112 in the height direction of the first beam 11. The two opposite sidewalls of the first cavity 110 in the first direction are the first inner plate portion 115 and the first outer plate portion 1130. The second sidewall portion 1112, the top plate 114, the first inner plate portion 115, and the first outer plate portion 1130 are integrally formed.

[0104] In the above technical solution, a first cavity 110 is provided along the height direction of the first beam 11. The first cavity 110 retains strength and rigidity while being lightweight, which is especially suitable for scenarios that need to balance "sturdiness" and "lightness". The air layer can block heat conduction and reduce noise. The hollow structure reduces the amount of material used, realizing "replacing materials with structure".

[0105] In some embodiments, referring to Figures 3 and 4, the first beam 11 is further provided with a second cavity 112, and a slot 111 is located between the first cavity 110 and the second cavity 112 along the height direction of the first beam 11.

[0106] For example, referring to Figure 4, the third side wall portion 1113 of the slot 111 forms the top wall of the second cavity 112. Referring to Figure 5, the bottom wall of the second cavity 112 is a bottom plate 1192. Referring to Figure 3, the two side walls of the second cavity 112 arranged opposite to each other along the first direction are a third outer plate portion 1121 and a third inner plate portion 1122. The third side wall portion 1113, the bottom plate 1192, the third outer plate portion 1121, and the third inner plate portion 1122 are integrally formed.

[0107] In the above technical solution, by setting the second cavity 112, strength and rigidity are retained under the premise of lightweighting, which is especially suitable for scenarios that need to balance "sturdiness" and "lightness". The air layer can block heat conduction and reduce noise. The hollow structure reduces the amount of material used and realizes "replacing materials with structure". Along the height direction of the first beam 11, the slot 111 is located between the first cavity 110 and the second cavity 112. When the two cavities are subjected to external forces (such as compression and temperature difference deformation), they will each generate independent deformation trends, protecting the welded part 15 of the first side wall 1111 and reducing the risk of welded part 15 breaking.

[0108] In some embodiments, referring to FIG3, the mounting beam 12 includes a mounting portion 120 and a second flange edge 122 connected to the mounting portion 120. The mounting portion 120 and the second flange edge 122 are arranged along the height direction of the first beam 11. The sidewall of the second cavity 112 includes a third outer plate portion 1121. The first beam 11 also includes a third outer plate portion 1121. The third outer plate portion 1121 is used to enclose the second cavity 112. The third outer plate portion 1121 is located on the side of the second cavity 112 near the outside of the housing 30 along a first direction. The second flange edge 122 is welded to the third outer plate portion 1121.

[0109] For example, referring to Figure 3, both the first flange edge 121 and the second flange edge 122 extend from the end of the mounting portion 120, and the first flange edge 121 and the second flange edge 122 are symmetrically arranged about the mounting portion 120. Optionally, both the first flange edge 121 and the second flange edge 122 are flat plate structures, and the first flange edge 121 and the second flange edge 122 are located on the same plane.

[0110] In the above technical solution, the second flange edge 122 is welded to the third outer plate portion 1121, so that in addition to the welding of the first side wall portion 1111, the second flange edge 122 and the third outer plate portion 1121 are also welded to the first beam 11, thereby enhancing the connection strength between the load-bearing beam 12 and the first beam 11.

[0111] In some embodiments, referring to FIG3, the first beam 11 further includes a third inner plate portion 1122, which is used to enclose a second cavity 112. The third inner plate portion 1122 and the third outer plate portion 1121 are disposed opposite to each other in a first direction. The third inner plate portion 1122 is provided with a through hole 1191, at least a portion of which is disposed opposite to the second flange edge 122.

[0112] The through hole 1191 is used to allow operating space for welding the second flange edge 122 and the third outer plate 1121.

[0113] In the above technical solution, the third inner plate 1122 is provided with a through hole 1191. The through hole 1191 is used to avoid the operating space for welding the second flange edge 122 and the third outer plate 1121. The welding gun can be inserted into the through hole 1191 so that the welding electrode clamps the second flange edge 122 and the third outer plate 1121 for welding, thereby reducing the welding difficulty and improving the welding efficiency.

[0114] In some embodiments, referring to FIG5, the diameter of the through hole 1191 is 3-10 mm.

[0115] In the above technical solution, the commonly used size of the electrode head for thin-wall welding is 3mm to 5mm. When the diameter of the through hole 1191 is 3-10mm, the electrode head for welding can be inserted into the through hole 1191 to clamp or abut against the third outer plate portion 1121 for welding.

[0116] In some embodiments, referring to Figures 5 and 6, the first beam 11 includes an outer plate 113 and an inner plate 118. The inner plate 118 is located on the side of the outer plate 113 closer to the box 30 along a first direction. The inner plate 118 includes a first inner plate portion 115, a second inner plate portion 116, and a third inner plate portion 1122 arranged sequentially along the height direction of the first beam 11. The second inner plate portion 116 is recessed towards the outside of the box 30 to form a slot 111. The outer plate 113 includes a first outer plate portion 1130, a second outer plate portion 1131, and a third outer plate portion 1122 arranged sequentially along the height direction of the first beam 11. The third outer plate portion 1121 and the second inner plate portion 116 include a bonding plate 117. The bonding plate 117 is arranged along the height direction of the first beam 11 and is bonded to the second outer plate portion 1131 to form a first side wall portion 1111. The second outer plate portion 1131 is located between the bonding plate 117 and the hanging beam 12. The first outer plate portion 1130 and the first inner plate portion 115 are arranged opposite to each other in the first direction and both form the side wall of the first cavity 110. The third outer plate portion 1121 and the third inner plate portion 1122 are arranged opposite to each other in the first direction and both form the side wall of the second cavity 112.

[0117] In the above technical solution, the first beam 11 includes an outer plate 113 and an inner plate 118. The second inner plate portion 116 is recessed towards the outside of the box body 30 to form a slot 111. This structural design enables the first beam 11 to be manufactured by roll forming process. Roll forming process has high production efficiency, is suitable for mass production, has high product precision, good dimensional consistency, high material utilization rate, and low overall cost; and can optimize material performance and improve product reliability.

[0118] In some embodiments, as shown in FIG4, the welded portion 15 formed by welding the mounting beam 12 to the first side wall portion 1111 is formed by melting and solidifying a portion of the second outer plate portion 1131, a portion of the bonding plate 117, and a portion of the mounting beam 12.

[0119] In the above technical solution, the welding part 15 is formed by melting and solidifying a portion of the second outer plate 1131, a portion of the bonding plate 117, and a portion of the mounting beam 12. This allows the second outer plate 1131 to be welded to the mounting beam 12 while simultaneously welding the second outer plate 1131 to the bonding plate 117, thereby enhancing the overall structural strength of the first beam 11. Furthermore, the second outer plate 1131, the bonding plate 117, and the mounting beam 12 can be welded simultaneously in one operation. This single welding operation directly welds the second outer plate 1131, the bonding plate 117, and the mounting beam 12, improving the manufacturing efficiency of the box 30.

[0120] In some embodiments, referring to FIG7, the battery device 100 further includes a reinforcing beam 13 connected to the first beam 11, and at least a portion of the reinforcing beam 13 is located in the slot 111.

[0121] The reinforcing beam 13 can be fixed to the first beam 11 by means of plug welding, adhesive bonding, self-piercing riveting or bolt connection.

[0122] In the above technical solution, the first beam 11 is connected by a reinforcing beam 13, and at least a portion of the reinforcing beam 13 is located in the slot 111, which solves the problem of reduced structural strength of the first beam 11 due to the formation of the slot 111, and the reinforcing beam 13 enhances the structural strength of the first beam 11.

[0123] In some embodiments, referring to FIG8, a third cavity 1301 is formed inside the reinforcing beam 13.

[0124] For example, the reinforcing beam 13 is a cuboid in shape, and a third cavity 1301 is formed inside the reinforcing beam 13 to form a thin-walled structure, thereby reducing the weight of the reinforcing beam 13.

[0125] In the above technical solution, a third cavity 1301 is formed inside the reinforcing beam 13. The third cavity 1301 retains strength and rigidity while being lightweight, making it particularly suitable for scenarios that require a balance between "sturdiness" and "lightness". The air layer can block heat conduction and reduce noise. The hollow structure reduces the amount of material used, achieving "replacing materials with structure".

[0126] In some embodiments, referring to Figures 6 to 8, the reinforcing beam 13 includes a body 130 and a support plate 131. The body 130 has a third cavity 1301. The support plate 131 is located in the third cavity 1301 and is arranged along the height direction of the first beam 11. The two ends of the support plate 131 along the height direction of the first beam 11 are respectively fixedly connected to the body 130.

[0127] In the above technical solution, the support plate 131 is located in the third cavity 1301 and is arranged along the height direction of the first beam 11. The support plate 131 increases the structural strength of the reinforcing beam 13. The support plate 131 extends along the height direction of the first beam 11, which solves the problem of reduced structural strength in the vertical direction caused by the formation of the slot 111.

[0128] In some embodiments, referring to FIG8, the difference between the dimension of the slot 111 along the height direction of the first beam 11 and the dimension of the reinforcing beam 13 along the height direction of the first beam 11 is in the range of 0.5-1mm.

[0129] The height of the slot 111 is 0.5-1mm larger than the height of the reinforcing beam 13, so that a gap is formed after the reinforcing beam 13 is installed in the slot 111. The difference between the height of the slot 111 and the height of the reinforcing beam 13 can be any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm.

[0130] In the above technical solution, the slot 111 and the reinforcing beam 13 are fitted with a clearance. The clearance can absorb the assembly tolerance of the reinforcing beam 13 and the first beam 11, and reduce the machining dimensional accuracy requirements of the reinforcing beam 13 and the first beam 11.

[0131] In some embodiments, referring to FIG7, along a first direction, the first beam 11 protrudes into the housing 30 relative to the reinforcing beam 13, and the first beam 11 abuts against the battery cell assembly 20.

[0132] In the above technical solution, the first beam 11 protrudes into the housing 30 relative to the reinforcing beam 13. When the battery device 100 experiences a side impact from outside the housing 30, the impact force first acts on the first beam 11. After the first beam 11 is partially deformed, it then acts on the reinforcing beam 13. The first beam 11 and the reinforcing beam 13 are crushed in a progressive manner, effectively extending the energy absorption time.

[0133] In some embodiments, referring to Figures 3 and 4, the first beam 11 is formed by bending a metal plate structure.

[0134] In the above technical solution, the first beam 11 is formed by bending a metal plate structure, resulting in high overall structural strength. The first beam 11, formed by bending a metal plate structure, can be bent and formed by roll forming during processing. Roll forming process has high production efficiency, is suitable for large-scale mass production, and produces products with high precision, good dimensional consistency, high material utilization, and low overall cost. Furthermore, it can optimize material performance and improve product reliability.

[0135] In some embodiments, at least a portion of the outer surface of the first beam 11 is covered with an anti-corrosion layer.

[0136] The anti-corrosion layer can be a galvanized layer. Zinc has a stronger chemical activity than iron, the material commonly used in the main body of the first beam 11. When the zinc layer is locally damaged (such as scratches), the zinc will preferentially oxidize (sacrificing itself) to protect the underlying steel from corrosion (this characteristic is called "cathode protection"). Even if the coating is damaged, it can continue to prevent rust.

[0137] In the above technical solution, by covering the outer surface of the first beam 11 with an anti-corrosion layer, the anti-corrosion layer completely isolates the internal material of the first beam 11 from the external oxygen, moisture and corrosive media, thus preventing the occurrence of corrosion reaction.

[0138] Referring to FIG9, in a second aspect, the present invention provides an electrical device 1000, including a battery device 100 according to an embodiment of the first aspect of the present invention.

[0139] The electrical device 1000 can be a vehicle, and the battery device 100 can be installed at the bottom of the vehicle body 200.

[0140] In the above technical solution, the electrical device 1000 is equipped with the battery device 100, which has low welding difficulty and high welding efficiency.

[0141] The battery device 100 according to some embodiments of the present invention is described below with reference to Figures 1-8.

[0142] In this embodiment, the battery device 100 includes a housing 30 and a battery cell assembly 20. The battery cell assembly 20 is disposed inside the housing 30. The housing 30 includes a first beam 11 and a mounting beam 12. The first beam 11 is located on one side of the battery cell assembly 20 along a first direction. The first beam 11 has a slot 111 with an opening 1110. The opening 1110 faces the inside of the housing 30 along the first direction. The first beam 11 includes a first sidewall portion 1111, which is used to enclose the slot 111. The first sidewall portion 1111 is disposed opposite to the opening 1110 along the first direction. The mounting beam 12 is located on the side of the first beam 11 facing the outside of the housing 30 along the first direction. The mounting beam 12 is welded to the first sidewall portion 1111.

[0143] The first beam 11 also includes a second side wall portion 1112 and a third side wall portion 1113. The second side wall portion 1112 and the third side wall portion 1113 are respectively connected to both sides of the first side wall portion 1111 along the height direction of the first beam 11. The thickness of the first side wall portion 1111 is greater than the thickness of the second side wall portion 1112, and the thickness of the first side wall portion 1111 is greater than the thickness of the third side wall portion 1113.

[0144] The mounting beam 12 includes a mounting part 120 and a first flange edge 121 connected to the mounting part 120. The first flange edge 121 and the mounting part 120 are arranged along the height direction of the first beam 11. The first flange edge 121 is fitted and welded to the first side wall part 1111.

[0145] The first beam 11 is also provided with a first cavity 110, and the first cavity 110 and the slot 111 are arranged along the height direction of the first beam 11. The first beam 11 is also provided with a second cavity 112, and the slot 111 is located between the first cavity 110 and the second cavity 112 along the height direction of the first beam 11.

[0146] The mounting beam 12 includes a mounting part 120 and a second flange edge 122 connected to the mounting part 120. The mounting part 120 and the second flange edge 122 are arranged along the height direction of the first beam 11. The side wall of the second cavity 112 includes a third outer plate part 1121. The first beam 11 also includes a third outer plate part 1121. The third outer plate part 1121 is used to enclose the second cavity 112. The third outer plate part 1121 is located on the side of the second cavity 112 near the outside of the box body 30 along the first direction. The second flange edge 122 is welded to the third outer plate part 1121.

[0147] The first beam 11 also includes a third inner plate portion 1122, which encloses the second cavity 112. The third inner plate portion 1122 and the third outer plate portion 1121 are arranged opposite to each other along a first direction. The third inner plate portion 1122 is provided with a through hole 1191, at least a portion of which is arranged opposite to the second flange edge 122. The diameter of the through hole 1191 is 3-10 mm.

[0148] The first beam 11 includes an outer plate 113 and an inner plate 118. The inner plate 118 is located on the side of the outer plate 113 closer to the inside of the housing 30 along a first direction. The inner plate 118 includes a first inner plate portion 115, a second inner plate portion 116, and a third inner plate portion 1122 arranged sequentially along the height direction of the first beam 11. The second inner plate portion 116 is recessed towards the outside of the housing 30 to form a slot 111. The outer plate 113 includes a first outer plate portion 1130, a second outer plate portion 1131, and a third outer plate portion 1122 arranged sequentially along the height direction of the first beam 11. 1. The second inner plate portion 116 includes a bonding plate 117. The bonding plate 117 is arranged along the height direction of the first beam 11 and is bonded to the second outer plate portion 1131 to form a first side wall portion 1111. The second outer plate portion 1131 is located between the bonding plate 117 and the hanging beam 12. The first outer plate portion 1130 and the first inner plate portion 115 are arranged opposite to each other along the first direction and both form the side wall of the first cavity 110. The third outer plate portion 1121 and the third inner plate portion 1122 are arranged opposite to each other along the first direction and both form the side wall of the second cavity 112.

[0149] The welded part 15 formed by welding the mounting beam 12 to the first side wall part 1111 is formed by melting and solidifying a portion of the second outer plate part 1131, a portion of the bonding plate 117, and a portion of the mounting beam 12.

[0150] The battery device 100 also includes a reinforcing beam 13, which connects to the first beam 11, and at least a portion of the reinforcing beam 13 is located within the slot 111. A third cavity 1301 is formed inside the reinforcing beam 13. The reinforcing beam 13 includes a body 130 and a support plate 131. The body 130 contains the third cavity 1301, and the support plate 131 is located within the third cavity 1301 and is positioned along the height direction of the first beam 11. Both ends of the support plate 131 along the height direction of the first beam 11 are fixedly connected to the body 130. The difference between the dimension of the slot 111 along the height direction of the first beam 11 and the dimension of the reinforcing beam 13 along the height direction of the first beam 11 is in the range of 0.5-1 mm.

[0151] Along the first direction, the first beam 11 protrudes into the housing 30 relative to the reinforcing beam 13, and the first beam 11 abuts against the battery cell assembly 20.

[0152] The first beam 11 is formed by bending a metal plate structure.

[0153] At least a portion of the outer surface of the first beam 11 is covered with an anti-corrosion layer.

[0154] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0155] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that, include: The enclosure comprises a housing and a battery cell assembly, wherein the battery cell assembly is disposed within the housing. The housing includes: a first beam located on one side of the battery cell assembly along a first direction, the first beam having a slot with an opening facing inwards from the housing along the first direction, the first beam including a first sidewall portion for enclosing the slot, the first sidewall portion being disposed opposite to the opening along the first direction; and a mounting beam located on the side of the first beam facing outwards from the housing along the first direction, the mounting beam being welded to the first sidewall portion.

2. The battery device according to claim 1, characterized in that, The first beam further includes a second sidewall portion and a third sidewall portion, which are respectively connected to both sides of the first sidewall portion along the height direction of the first beam. The first sidewall portion, the second sidewall portion, and the third sidewall portion together enclose the slot. The thickness of the first sidewall portion is greater than the thickness of the second sidewall portion, and the thickness of the first sidewall portion is greater than the thickness of the third sidewall portion.

3. The battery device according to claim 1, characterized in that, The mounting beam includes a mounting part and a first flange edge connected to the mounting part. The first flange edge and the mounting part are arranged along the height direction of the first beam. The first flange edge is fitted and welded to the first side wall part.

4. The battery device according to claim 1, characterized in that, The first beam is also provided with a first cavity, and the first cavity and the slot are arranged along the height direction of the first beam.

5. The battery device according to claim 4, characterized in that, The first beam is also provided with a second cavity, and the slot is located between the first cavity and the second cavity along the height direction of the first beam.

6. The battery device according to claim 5, characterized in that, The mounting beam includes a mounting part and a second flange edge connected to the mounting part. The mounting part and the second flange edge are arranged along the height direction of the first beam. The first beam also includes a third outer plate part, which is used to enclose the second cavity. The third outer plate part is located on the side of the second cavity near the outside of the box along the first direction. The second flange edge is welded to the third outer plate part.

7. The battery device according to claim 6, characterized in that, The first beam further includes a third inner plate portion, which is used to enclose the second cavity. The third inner plate portion and the third outer plate portion are disposed opposite to each other along the first direction. The third inner plate portion is provided with a through hole, and at least a portion of the through hole is disposed opposite to the second flange edge.

8. The battery device according to claim 7, characterized in that, The diameter of the through hole is 3-10 mm.

9. The battery device according to claim 5, characterized in that, The first beam includes an outer plate and an inner plate. The inner plate is located on the side of the outer plate closer to the box body along the first direction. The inner plate includes a first inner plate portion, a second inner plate portion, and a third inner plate portion arranged sequentially along the height direction of the first beam. The second inner plate portion is recessed towards the outside of the box body to form the slot. The outer plate includes a first outer plate portion, a second outer plate portion, and a third outer plate portion arranged sequentially along the height direction of the first beam. The second inner plate portion includes a bonding plate. The bonding plate is arranged along the height direction of the first beam and is bonded to the second outer plate portion to form the first side wall portion. The second outer plate portion is located between the bonding plate and the mounting beam. The first outer plate portion and the first inner plate portion are arranged opposite each other along the first direction and both form the side wall of the first cavity. The third outer plate portion and the third inner plate portion are arranged opposite each other along the first direction and both form the side wall of the second cavity.

10. The battery device according to claim 9, characterized in that, The mounting beam is welded to the first side wall to form a welded part, which is formed by melting and solidifying a portion of the second outer plate, a portion of the bonding plate, and a portion of the mounting beam.

11. The battery device according to any one of claims 1-10, characterized in that, The battery device further includes a reinforcing beam connected to the first beam, and at least a portion of the reinforcing beam is located in the slot.

12. The battery device according to claim 11, characterized in that, A third cavity is formed inside the reinforcing beam.

13. The battery device according to claim 12, characterized in that, The reinforcing beam includes a body and a support plate. The body has a third cavity, and the support plate is located in the third cavity and is arranged along the height direction of the first beam. The two ends of the support plate along the height direction of the first beam are fixedly connected to the body.

14. The battery device according to claim 11, characterized in that, The difference between the dimension of the slot along the height direction of the first beam and the dimension of the reinforcing beam along the height direction of the first beam is in the range of 0.5-1mm.

15. The battery device according to claim 11, characterized in that, Along the first direction, the first beam protrudes into the housing relative to the reinforcing beam, and the first beam abuts against the battery cell assembly.

16. The battery device according to any one of claims 1-10, characterized in that, The first beam is formed by bending a metal plate structure; and / or, at least a portion of the outer surface of the first beam is covered with an anti-corrosion layer.

17. An electrical device, characterized in that, include: The battery device according to any one of claims 1-16.

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