Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device. The battery device comprises a box body, a battery module and a battery module, the two expansion beams are both arranged in the box body, the two expansion beams extend in the first direction and are arranged at intervals in the second direction, each expansion beam comprises a plurality of beam sections which are sequentially connected in the first direction, and the two expansion beams are the first expansion beam and the second expansion beam correspondingly; the connecting position of the multiple beam sections of the first expansion beam is a first connecting position, the connecting position of the multiple beam sections of the second expansion beam is a second connecting position, and the first connecting position and the second connecting position are arranged in a staggered mode in the second direction. According to the technical scheme, the stress on the two expansion beams can be effectively dispersed, the probability of stress concentration and weak area formation is reduced, the structural stability, torsion resistance and overall rigidity of the battery device are improved, the mechanical property of the battery device is improved, the fault risk caused by structural damage is reduced, and the service life of the battery device is prolonged. And the operation reliability and stability of the battery device are improved.

Description

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] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Among them, battery devices, as core components of new energy vehicles, have high requirements in terms of both energy density and reliability.

[0003] Battery packs typically consist of a housing and multiple battery modules arranged within it. To effectively secure the battery modules within the housing, expansion beams are usually positioned on both sides perpendicular to the arrangement direction of the battery modules and extend along that direction. However, when the expansion beams are too long, the processing difficulty of the material increases during manufacturing, and the forming accuracy becomes difficult to guarantee, failing to meet manufacturability requirements.

[0004] In existing technologies, to address the manufacturing difficulties caused by the excessive length of expansion beams, a segmented expansion beam design is employed. However, segmented expansion beams exhibit inconsistent stiffness at connection points, affecting the stability of the battery module. Therefore, balancing the manufacturing feasibility of the expansion beam with the stiffness issue at the connection points is a critical problem that urgently needs to be solved in the design and manufacturing of current battery devices. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, this invention provides a battery device and an electrical device incorporating this battery device. The battery device can improve the structural stability, torsional resistance, and overall stiffness of the battery device, improve its mechanical properties, reduce the risk of failure due to structural damage, and enhance the reliability and stability of the battery device's operation.

[0006] In a first aspect, an embodiment of the present invention provides a battery device, comprising: a housing; two expansion beams, both of which are disposed within the housing, the two expansion beams extending along a first direction and spaced apart along a second direction, the first direction intersecting the second direction, each of the two expansion beams including a plurality of beam segments sequentially connected in the first direction, the two expansion beams being a first expansion beam and a second expansion beam, wherein the connection position of the plurality of beam segments of the first expansion beam is a first connection position, the connection position of the plurality of beam segments of the second expansion beam is a second connection position, and the first connection position and the second connection position are staggered in the second direction.

[0007] In the above technical solution, by staggering the first connection position formed by multiple beam segments of the first expansion beam and the second connection position formed by multiple beam segments of the second expansion beam, the stress on the two expansion beams can be effectively dispersed, reducing the probability of stress concentration and weak area formation, improving the structural stability, torsional resistance and overall stiffness of the battery device, improving the mechanical performance of the battery device, reducing the risk of failure due to structural damage, and improving the reliability and stability of the battery device operation.

[0008] In some embodiments, in the first direction, the distance between the first connection position and the second connection position is greater than or equal to 100 mm.

[0009] In the above technical solution, since the distance D1 between the first connection position and the second connection position is greater than 100mm, the distance between the first connection position and the second connection position can be increased, so that the two expansion beams can better disperse stress when bearing various loads of the battery device, and transmit the force more evenly to the entire battery device structure. This further reduces the risk of local stress concentration caused by the small distance, further reduces the risk of deformation and damage at the connection position, and further improves the reliability and stability of the battery device.

[0010] In some embodiments, the distance between adjacent first connection positions and second connection positions in the first direction is less than or equal to 200 mm.

[0011] In the above technical solution, since the distance D1 between adjacent first and second connection positions satisfies: 100mm≤D1≤200mm, it can effectively disperse external forces, reduce stress concentration and the probability of deformation and damage at the connection position, and improve structural stability; it can also balance the transmission of forces, enhance the deformation resistance of the battery device, and improve reliability and durability; it is also conducive to achieving a balance between the compactness and functionality of the battery device.

[0012] In some embodiments, the length of the beam segment in the first direction is less than or equal to 1.2m.

[0013] In the above technical solution, since the length L of the beam segment in the first direction is less than or equal to 1.2m, the structural stability of the beam segment can be improved, and the probability of beam segment deformation and stress concentration can be reduced; the production efficiency of the beam segment can also be improved, and the cost can be reduced; the transmission and dispersion of forces on the expansion beam can also be optimized, and the overall performance of the battery device can be enhanced.

[0014] In some embodiments, the length of the beam segment in the first direction is less than or equal to 1m.

[0015] In the above technical solution, since the length L of the beam segment in the first direction is less than or equal to 1m, the structural stability of the beam segment can be further improved, and the probability of deformation and stress concentration of the beam segment can be further reduced. It can also further improve the production efficiency of the beam segment, reduce costs, further optimize the transmission and dispersion of forces on the expansion beam, and enhance the overall performance of the battery device.

[0016] In some embodiments, the length of the beam segment in the first direction is greater than or equal to 60 cm.

[0017] In the above technical solution, since the length L of the beam segment is greater than or equal to 60cm, the structural continuity of the beam segment can be enhanced, a coherent support system can be provided, the support range can be expanded, the force can be evenly distributed, the stability and load-bearing capacity of the battery device can be improved, and the reliable operation of the battery device can be guaranteed.

[0018] In some embodiments, in the first direction, the length of the box is greater than or equal to 1.8m and less than or equal to 2m.

[0019] In the above technical solution, since the length L0 of the housing is greater than or equal to 1.8m and less than or equal to 2m, the expansion beam consists of multiple beam segments connected in sequence, and the connection positions of the beam segments of the two expansion beams are staggered in the second direction. This can not only effectively disperse the stress on the two expansion beams, improve the structural stability, torsional resistance and overall stiffness of the battery device, and improve the mechanical performance of the battery device, but also increase the energy density of the battery device, reduce the width of the housing, facilitate the assembly of the battery device, adapt to more types of vehicles, and improve the space utilization of the vehicle.

[0020] In some embodiments, the battery device includes multiple battery modules, which are disposed in a housing and arranged sequentially along a first direction, and two expansion beams are respectively arranged on both sides of the multiple battery modules in a second direction.

[0021] In the above technical solution, since the battery device includes multiple battery modules arranged along the first direction, and the two ends of the multiple battery modules are respectively connected to two expansion beams in the second direction, the expansion beams can not only enhance the structural stability of the battery device, but also disperse the expansion stress and external impact force of the battery modules. The modular design of the battery modules is not only conducive to the thermal management of the battery device and improves the thermal management efficiency, but also facilitates the modular maintenance of individual battery modules, making it easy to disassemble and replace, reducing maintenance costs, and extending the service life of the battery device.

[0022] In some embodiments, a battery compartment is defined within the housing, and the length of the battery compartment is greater than or equal to 1m in a first direction.

[0023] In the above technical solution, since the length L1 of the battery compartment in the first direction is greater than or equal to 1m, the expansion beam is set as multiple beam segments connected in sequence, and the connection positions of the beam segments of the two expansion beams are staggered in the second direction. This not only reduces the processing difficulty of the expansion beam, but also effectively disperses the stress on the two expansion beams, improves the structural stability, torsional resistance and overall stiffness of the battery device, and improves the mechanical performance of the battery device.

[0024] In some embodiments, the length of the battery compartment is greater than or equal to 1.4m in the first direction.

[0025] In the above technical solution, since the length L1 of the battery compartment in the first direction is greater than or equal to 1.4m, the battery compartment is relatively long. The expansion beam is set as multiple beam segments connected in sequence, and the connection positions of the beam segments of the two expansion beams are staggered in the second direction. This not only reduces the processing difficulty of the expansion beam, but also effectively disperses the stress on the two expansion beams, improves the structural stability, torsional resistance and overall stiffness of the battery device, and improves the mechanical performance of the battery device.

[0026] In some embodiments, the width dimension of the battery module in the first direction is the module width, and the ratio of the length of the beam segment to the module width is greater than or equal to 1.1.

[0027] In the above technical solution, since the length L of the beam segment is at least greater than or equal to 1.1 times the width W of the module, the beam segment is not too short. The relatively long beam segment can not only better disperse the expansion force generated by the charging and discharging of the battery module, reduce the risk of stress concentration, and improve the support stability of the battery module, but also reduce the number of beam segments. This improves assembly efficiency and reduces the risk of loose connections at the connection points. On the other hand, it frees up more space for the battery module and increases energy density.

[0028] In some embodiments, the ratio of the beam segment length to the module width is greater than or equal to 1.5.

[0029] In the above technical solution, since the length L of the beam segment is greater than or equal to 1.5 times the width W of the module, the length of the beam segment can be further increased, the number of beam segments can be reduced, the assembly efficiency can be improved, the risk of loosening of the connection position can be reduced, the expansion force generated by the charging and discharging of the battery module can be further effectively dispersed, the support stability of the battery module can be improved, and more space can be freed up for the battery module to increase the energy density.

[0030] In some embodiments, a gap space is formed between two adjacent battery modules in a first direction, and at least a portion of the connection positions of the plurality of beam segments are offset from the gap space in a second direction.

[0031] In the above technical solution, since the connection positions and gap spaces of multiple beam segments are staggered in the second direction, the risk of structural weak points caused by the overlap of connection positions and gap spaces can be effectively reduced. When the battery device is subjected to external impact or the expansion force of the battery module itself, since the connection positions and gap spaces are more evenly distributed in the first direction, the force can be more evenly distributed to each beam segment and battery module, reducing the probability of stress concentration in a certain area, thereby enhancing the structural stability of the entire battery device and reducing the risk of deformation or damage to the battery device.

[0032] In some embodiments, in the first direction, the distance between the connection position and the gap space is greater than or equal to 100 mm.

[0033] In the above technical solution, since the distance D2 between the connection position and the gap space in the first direction is greater than 100mm, the offset distance between the connection position and the gap space can be increased. When the battery device is subjected to external force, the two expansion beams and multiple battery modules can distribute the stress more evenly and transfer the force more evenly to the entire battery device structure. This further reduces the risk of local stress concentration caused by the small spacing and further improves the structural stability and reliability of the battery device.

[0034] In some embodiments, in a projection plane perpendicular to the second direction, the projection of any connection location is completely located within the projection of one of the battery modules, and in the first direction, the projection of the connection location is located within 1 / 4 to 3 / 4 of the projection of the corresponding battery module.

[0035] In the above technical solution, by making the projection of the connection position fall within 1 / 4 to 3 / 4 of the projection of the corresponding battery module in the first direction, the connection position can be fully supported by the battery module. When the battery device is subjected to external force, the stress on the connection part can be effectively distributed to the whole battery module, reducing the risk of local stress concentration at the connection position due to uneven force, thereby significantly enhancing the structural stability.

[0036] In some embodiments, fixing holes are formed on the beam segment, and the two ends of the battery module in the second direction are fixedly connected to the two expansion beams through the fixing holes by fasteners.

[0037] In the above technical solution, the battery module is fixedly connected to the expansion beam by fasteners, which not only reliably fixes the battery module to the expansion beam, but also improves the installation and disassembly efficiency of the battery device.

[0038] In some embodiments, the battery module includes a plurality of battery cells, which are stacked in a row along a second direction, and the multiple rows of battery cells are arranged in a first direction to form a battery module.

[0039] In the above technical solution, since the battery module includes multiple rows of battery cells arranged along the first direction, and multiple battery cells in each row are stacked along the second direction, the number of battery cells in the battery module in the width direction of the box can be designed and adjusted according to the dimensions of the box, thereby improving the space utilization rate inside the box and increasing the energy density of the battery device.

[0040] In some embodiments, two adjacent beam segments are lapped together in a first direction.

[0041] In the above technical solution, since the two adjacent beam segments are connected by lap joint, the contact area between the beam segments can be increased, the force transmission can be more uniform, the stress can be effectively dispersed, the overall structural strength of the expansion beam can be improved, and the risk of damage due to stress concentration at the connection can be reduced. At the same time, when assembling the expansion beam, the lap joint does not require complex positioning and high-precision docking, which facilitates the positioning and assembly between beam segments, simplifies the operation, and improves the assembly efficiency.

[0042] In some embodiments, in the first direction, the overlap length of two adjacent beam segments is greater than or equal to 50 mm.

[0043] In the above technical solution, since the overlap length d1 of two adjacent beam segments is greater than or equal to 50mm, there is sufficient overlap length between adjacent beam segments, which increases the contact area between beam segments, allows the force between beam segments to be transmitted more evenly and stably, effectively disperses stress, significantly improves the overall structural strength, and reduces the risk of damage at the connection due to stress concentration.

[0044] In some embodiments, in the first direction, the overlap length of two adjacent beam segments is greater than or equal to 50 mm and less than or equal to 100 mm.

[0045] In the above technical solution, since the overlap length d1 of the beam segment is greater than or equal to 50mm and less than or equal to 100mm, there is sufficient contact area between the beam segments, so that the stress is evenly distributed, the overall structural strength is enhanced, the expansion beam can effectively resist external impact and vibration, and the amount of material and weight of the expansion beam can be effectively controlled, the space occupied by the expansion beam can be controlled, thereby reducing costs, increasing the energy density of the battery device, and improving the space utilization and assembly efficiency within the battery device.

[0046] In some embodiments, two adjacent beam segments in a first direction are welded and / or fastened together.

[0047] In the above technical solution, welding adjacent beam segments together enhances the structural strength and stability of the connection point, thereby improving the impact resistance of the expansion beam. The tight connection between adjacent beam segments also facilitates installation and disassembly, improving maintenance and component replacement efficiency.

[0048] In some embodiments, the beam segment includes a body and a flange. The body extends along a first direction, and the cross-section of the body perpendicular to the first direction is U-shaped, opening toward the bottom wall of the box. The flange is connected to both sides of the body in a second direction and is fixedly connected to the bottom wall of the box.

[0049] In the above technical solution, the main body has a U-shaped cross-section, which enhances the structural strength and rigidity of the beam segment, effectively supports the weight of the battery module, reduces the probability of deformation of the beam segment due to gravity or external forces, and improves the stability of the battery device. The flange is fixed to the bottom wall of the housing, which not only increases the connection area between the beam segment and the housing, making the connection more stable, but also allows the flange to better transfer the forces on the battery module and beam segment to the housing, further strengthening the overall structural strength.

[0050] In some embodiments, the flange is welded to the bottom wall of the housing.

[0051] In the above technical solution, the flange is welded to the bottom wall of the box, which can enhance the connection strength and stability between the beam segment and the bottom wall of the box, effectively transfer the stress of the battery module, and improve the overall structural reliability.

[0052] In some embodiments, the width of the flange in the second direction is greater than or equal to 13 mm.

[0053] In the above technical solution, the flange width in the second direction is greater than or equal to 13mm, which increases the welding area between the flange and the bottom wall of the housing, enhances the connection stability between the flange and the bottom wall, makes the force transmission more uniform, reduces stress concentration, and improves the overall structural strength. At the same time, the wider flange can also provide sufficient space for welding operations, ensure welding quality, and extend the service life of the battery device.

[0054] In some embodiments, drainage holes and / or weight-reducing holes are formed on the beam segment.

[0055] In the above technical solution, the drainage holes on the beam segment can be used to drain liquid during electrophoresis, thereby improving the electrophoresis quality and enhancing the corrosion resistance of the beam segment. The weight reduction holes can reduce the weight of the beam segment and increase the energy density of the battery device.

[0056] In some embodiments, the beam segment is made of steel, aluminum, or aluminum alloy.

[0057] In the above technical solution, the beam segment is made of steel, which has high strength and good toughness, and can stably support the battery module and adapt to complex working conditions; the aluminum component is lightweight, which can reduce the overall weight of the battery device and increase energy density; the aluminum alloy component can not only make the structure stable, but also meet the requirements of lightweighting.

[0058] Secondly, embodiments of the present invention provide an electrical device, including a battery device according to the first aspect of the present invention.

[0059] In the above-described embodiments, by setting the battery device of the first aspect, the battery device can effectively disperse the stress on the two expansion beams by staggering the first connection position formed by the multiple beam segments of the first expansion beam and the second connection position formed by the multiple beam segments of the second expansion beam. This reduces the probability of stress concentration and the formation of weak areas, improves the structural stability, torsional resistance and overall stiffness of the battery device, improves the mechanical performance of the battery device, reduces the risk of failure due to structural damage, and improves the reliability and stability of the battery device operation, thereby improving the overall performance of the electrical device.

[0060] 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

[0061] Figure 1 This is a structural schematic diagram of a vehicle according to an embodiment of the present utility model;

[0062] Figure 2 This is a schematic diagram of the structure of a battery device according to an embodiment of the present utility model;

[0063] Figure 3 This is an exploded view of a battery device according to an embodiment of the present invention;

[0064] Figure 4 This is a schematic diagram of the structure of the base plate and heat exchange component of the battery device according to an embodiment of the present utility model;

[0065] Figure 5 yes Figure 4 A schematic diagram of the base plate and heat exchanger from another angle;

[0066] Figure 6 This is an exploded view of the base plate and multiple battery modules of the battery device according to an embodiment of the present utility model;

[0067] Figure 7 yes Figure 6 A schematic diagram of the base plate and multiple battery modules from another angle;

[0068] Figure 8 This is an exploded view of the base plate of the battery device and a battery module according to an embodiment of the present utility model.

[0069] Figure label:

[0070] 1. Electrical equipment; 1000. Battery; 2000. Controller; 3000. Motor;

[0071] 100. Housing; 110. Base plate; 120. Top cover; 101. Battery compartment; 102. Clearance space; 130. Divider beam;

[0072] 200, Expansion beam; 200a, First expansion beam; 200b, Second expansion beam;

[0073] 210. Beam segment; 220. Connection position; 220a. First connection position; 220b. Second connection position;

[0074] 300. Battery module; 310. Battery cell; 400. Heat exchanger;

[0075] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0076] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0077] 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 invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the invention, are intended to cover non-exclusive inclusion.

[0078] In the description of the embodiments of this utility model, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly defined.

[0079] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0080] In the description of this utility model embodiment, 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, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0081] In the description of the embodiments of this utility model, the term "multiple" refers to two or more (including two).

[0082] In the description of the embodiments of this utility model, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model 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 utility model.

[0083] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0084] The battery apparatus mentioned in the embodiments of this utility model may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include one or more battery cells; when there are multiple battery cells, they are connected in series, parallel, or mixed connections via a busbar.

[0085] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0086] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0087] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0088] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to 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, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0091] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0092] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0093] The battery cells mentioned in the embodiments of this utility model may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this utility model embodiment is not limited to these. The battery cells may be cylindrical, flat, cuboid, or other shapes, etc., and this utility model embodiment is not limited to these shapes either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this utility model embodiment is not limited to these types either.

[0094] For example, a single battery cell typically includes a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and the electrolyte, and the housing has at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive electrode sheets, negative electrode sheets, and separators.

[0095] The technical solutions described in this utility model embodiment are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0096] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Among them, battery devices, as core components of new energy vehicles, have high requirements in terms of both energy density and reliability.

[0097] Battery packs typically consist of a housing and multiple battery modules arranged within it. To effectively secure the battery modules within the housing, expansion beams are usually positioned on both sides perpendicular to the arrangement direction of the battery modules and extend along that direction. However, when the expansion beams are too long, the processing difficulty of the material increases during manufacturing, and the forming accuracy becomes difficult to guarantee, failing to meet manufacturability requirements.

[0098] In existing technologies, to address the manufacturing difficulties caused by the excessive length of expansion beams, a segmented expansion beam design is employed. However, segmented expansion beams exhibit inconsistent stiffness at connection points, affecting the stability of the battery module. Therefore, balancing the manufacturing feasibility of the expansion beam with the stiffness issue at the connection points is a critical problem that urgently needs to be solved in the design and manufacturing of current battery devices.

[0099] Based on the above considerations, in order to reduce the manufacturing difficulty of the expansion beam and improve the structural strength of the main battery device, this utility model designs a battery device in which the first and second expansion beams of the battery device are both composed of multiple beam segments connected sequentially in the first direction. The connection positions of the multiple beam segments of the first expansion beam and the connection positions of the multiple beam segments of the second expansion beam are staggered in the second direction. This can effectively disperse the stress on the two expansion beams, reduce the probability of stress concentration and the formation of weak areas, improve the structural stability, torsional resistance and overall stiffness of the battery device, improve the mechanical performance of the battery device, reduce the risk of failure due to structural damage, and improve the reliability and stability of the battery device operation.

[0100] This utility model provides an electrical device that uses the battery cell disclosed herein as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0101] For ease of explanation, the following embodiments use a vehicle as an example to describe the structure of the electrical device 1 and the battery device 1000 of this utility model in detail.

[0102] Please refer to Figure 1 , Figure 1 The electrical device 1 provided in some embodiments of this utility model is a structural schematic diagram of a vehicle. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle is equipped with a battery device 1000, which can be located at the bottom, front, or rear of the vehicle. The battery device 1000 can be used to supply power to the vehicle; for example, the battery device 1000 can serve as the vehicle's operating power source. The vehicle may also include a controller 2000 and a motor 3000. The controller 2000 controls the battery device 1000 to supply power to the motor 3000, for example, to meet the power needs of starting, navigation, and driving the vehicle. In some embodiments of this utility model, the battery device 1000 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0103] The following is for reference. Figures 2-8 A battery device 1000 according to a first aspect embodiment of the present invention is described.

[0104] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 1000 provided in some embodiments of the present invention. Figure 3 This is an exploded view of a battery device 1000 provided in some embodiments of the present invention. The battery device 1000 includes a housing 100 and a plurality of battery modules 300. The housing 100 provides assembly space for the battery modules 300, which are housed within the housing 100. Each battery module 300 includes a plurality of battery cells 310.

[0105] Figure 4 This is a schematic diagram of the structure of the base plate 110 and the heat exchanger 400 of the battery device 1000 according to some embodiments of the present utility model. Figure 5 yes Figure 4 A schematic diagram of the structure of the base plate 110 and the heat exchanger 400 from another angle shown; Figure 6 This is a schematic diagram of the base plate 110 and multiple battery modules 300 of the battery device 1000 according to some embodiments of the present utility model. Figure 7 yes Figure 6 A schematic diagram of the base plate 110 and multiple battery modules 300 from another angle shown; Figure 8 This is an exploded view of the base plate 110 of the battery device 1000 and a battery module 300 according to some embodiments of the present invention.

[0106] This utility model embodiment proposes a battery device 1000, such as... Figure 4 and Figure 5 As shown, the battery device 1000 includes: a housing 100 and two expansion beams 200. The two expansion beams 200 are both disposed inside the housing 100. The two expansion beams 200 extend along a first direction X and are arranged at intervals along a second direction Y. The first direction X and the second direction Y intersect. Each of the two expansion beams 200 includes multiple beam segments 210 connected sequentially along the first direction X. The two expansion beams 200 are a first expansion beam 200a and a second expansion beam 200b, respectively. The connection position 220 of the multiple beam segments 210 of the first expansion beam 200a is the first connection position 220a, and the connection position 220 of the multiple beam segments 210 of the second expansion beam 200b is the second connection position 220b. The first connection position 220a and the second connection position 220b are staggered along the second direction Y.

[0107] In some examples, such as Figure 3 As shown, the housing 100 includes a base plate 110 and a top cover 120. The top cover 120 covers the upper side of the base plate 110 and cooperates with the base plate 110 to define a receiving cavity. The battery cells 310 and other electrical components of the battery device 1000 are all located in the receiving cavity. In some specific examples, the base plate 110 is plate-shaped, and a mounting plate extending upward is provided along the front edge of the base plate 110. The top cover 120 is box-shaped with its lower side open. A clearance opening adapted to the shape of the mounting plate is formed on the front edge of the top cover 120. When the top cover 120 is placed on the base plate 110, the mounting plate covers the clearance opening. A sealing element is provided between the top cover 120 and the base plate 110 to seal the gap between the top cover 120 and the base plate 110.

[0108] like Figure 3As shown, the expansion beam 200 is located within the receiving cavity and is used to fix the battery module 300 of the battery device 1000 and limit the thermal expansion of the battery cells 310 of the battery module 300. This reduces the deformation of the battery cells 310 during charging and discharging, lowers the probability of damage to the battery cells 310 due to mutual compression, and extends the service life of the battery device 1000. Simultaneously, the expansion beam 200 also enhances the structural strength of the housing 100 and the overall structural strength of the battery device 1000, enabling the battery device 1000 to operate stably and reliably.

[0109] In some examples, such as Figure 4 As shown, the expansion beam 200 is fixed to the base plate 110. There are two expansion beams 200, which extend forward and backward (e.g., ...). Figure 4 The first direction X shown is respectively arranged on the left and right sides of the base plate 110 (e.g., the first direction X) and respectively. Figure 4 The base plate 110 shown is located near the edge on both sides in the second direction Y.

[0110] Multiple ribs are also formed on the base plate 110. The multiple ribs extend to the left and right and are spaced apart in the front and back direction. The multiple ribs, the base plate 110 and the expansion beam 200 cooperate to define the receiving groove, which is used to receive the heat exchange tube of the heat exchange element 400.

[0111] In some examples, such as Figure 4 As shown, any expansion beam 200 may include two, three, four, five or more beam segments 210, and multiple beam segments 210 are sequentially connected in the first direction X. Compared with molding the expansion beam 200 as a single piece, dividing the expansion beam 200 into multiple segments can not only improve the structural strength of the expansion beam 200 and the structural strength of the housing 100, and improve the stability and reliability of fixing the battery module 300 of the battery device 1000, but also facilitate the manufacturing and installation of the expansion beam 200, reduce the processing and manufacturing difficulty of the expansion beam 200, and improve production efficiency. In addition, the multi-segment expansion beam 200 is also more conducive to adapting to the internal spatial layout of the housing 100.

[0112] In some examples, such as Figure 4As shown, when the first expansion beam 200a is composed of two beam segments 210, one first connection position 220a is formed on the first expansion beam 200a. When the first expansion beam 200a is composed of three beam segments 210, two first connection positions 220a are formed on the first expansion beam 200a. That is, when the first expansion beam 200a is composed of N beam segments 210, where N is a positive integer greater than or equal to 2, N-1 first connection positions 220a are formed on the first expansion beam 200a. Similarly, when the second expansion beam 200b is composed of M beam segments 210, where M is a positive integer greater than or equal to 2, M-1 second connection positions 220b are formed on the second expansion beam 200b.

[0113] It should be noted that the total number of beam segments 210 included in the first expansion beam 200a may be the same as or different from the number of beam segments 210 included in the second expansion beam 200b.

[0114] In some embodiments, such as Figure 4 As shown, two adjacent beam segments 210 of the expansion beam 200 can be connected by snap-fit, welding, riveting, adhesive bonding, magnetic attraction and / or fasteners.

[0115] The first connection position 220a and the second connection position 220b are staggered in the second direction Y, meaning that in a projection plane perpendicular to the second direction Y, the projections of the first connection position 220a and the second connection position 220b do not coincide at all. When there are multiple first connection positions 220a and / or multiple second connection positions 220b, all the multiple first connection positions 220a and multiple second connection positions 220b are completely staggered in the second direction Y.

[0116] It should be noted that when the first connection position 220a and the second connection position 220b are aligned on the same straight line in the second direction Y, the battery device 1000 will form a stress concentration point or a structural weak area at the alignment position. When the battery device 1000 is subjected to external force, the stress at the alignment position is too large, which can easily cause the battery device 1000 to deform or even be damaged at the alignment position.

[0117] In this embodiment, the first connection position 220a and the second connection position 220b are staggered in the second direction Y, so that the first connection position 220a and the second connection position 220b are not in the same cross section of the battery device 1000 perpendicular to the first direction X. In this way, the stress distribution on the two expansion beams 200 can be more uniform, the probability of stress accumulation at a specific point can be reduced, and the stiffness distribution on the two expansion beams 200 can be more reasonable, thereby significantly improving the overall structural strength and stability of the battery device 1000.

[0118] Meanwhile, when the battery device 1000 is subjected to torsional force, the first connection position 220a and the second connection position 220b are staggered in the second direction Y, which allows the two expansion beams 200 to generate resistance at different locations, enhancing torsional resistance and reducing the risk of damage to the battery module 300 due to torsion. Furthermore, the two expansion beams 200 working together at different locations can further improve the rigidity of the battery device 1000 and enhance its resistance to deformation.

[0119] In the above technical solution, by staggering the first connection position 220a formed by multiple beam segments 210 of the first expansion beam 200a and the second connection position 220b formed by multiple beam segments 210 of the second expansion beam 200b, the stress on the two expansion beams 200 can be effectively dispersed, reducing the probability of stress concentration and weak area formation, improving the structural stability, torsional resistance and overall stiffness of the battery device 1000, improving the mechanical properties of the battery device 1000, reducing the risk of failure due to structural damage, and improving the reliability and stability of the battery device 1000 operation.

[0120] In some embodiments of this utility model, such as Figure 4 As shown, in the first direction X, the distance D1 between the first connection position 220a and the second connection position 220b is greater than or equal to 100mm.

[0121] For example, in the first direction X, the spacing D1 between the adjacent first connection position 220a and the second connection position 220b can be 100mm, 120mm, 140mm, 160mm, 180mm, 200mm, 220mm, 240mm, 260mm, 280mm, 300mm, 320mm, 350mm, 380mm or 400mm or more, etc.

[0122] In some examples, in the first direction X, the spacing D1 between the adjacent first connection position 220a and the second connection position 220b can satisfy: 100mm≤D1≤600mm, or 100mm≤D1≤500mm, or 100mm≤D1≤300mm.

[0123] It should be noted that when the distance D1 between the first connection position 220a and the second connection position 220b in the first direction X is too small, for example, when the distance D1 between the first connection position 220a and the second connection position 220b is less than 100mm, the stress concentration phenomenon within the battery device 1000 will be aggravated. Specifically, when the battery device 1000 is subjected to various external forces (such as thermal expansion of the battery cell 310 or external impact), the external forces cannot be sufficiently dispersed within a small distance, resulting in excessive stress at the connection position 220, which may lead to deformation or damage to the connection position 220, affecting the overall structural stability of the battery device 1000. In addition, if the distance between the first connection position 220a and the second connection position 220b is too small, the first connection position 220a and the second connection position 220b will interfere with each other's force transmission, resulting in uneven force distribution, reducing the battery device 1000's ability to resist external forces, and affecting its reliability.

[0124] In the above technical solution, since the distance D1 between the first connection position 220a and the second connection position 220b is ≥100mm, the offset distance between the first connection position 220a and the second connection position 220b can be increased, so that the two expansion beams 200 can better disperse stress when bearing various loads of the battery device 1000, and transmit the force more evenly to the entire battery device 1000 structure, further reducing the risk of local stress concentration caused by the small distance, further reducing the risk of deformation and damage at the connection position 220, and further improving the reliability and stability of the battery device 1000.

[0125] In some embodiments of this utility model, such as Figure 4 As shown, in the first direction X, the distance D1 between adjacent first connection positions 220a and second connection positions 220b is less than or equal to 200mm.

[0126] In other words, in the first direction X, the distance D1 between adjacent first connection positions 220a and second connection positions 220b satisfies: 100mm ≤ D1 ≤ 200mm. For example, in the first direction X, the distance D1 between adjacent first connection positions 220a and second connection positions 220b can be 105mm, 115mm, 125mm, 135mm, 145mm, 155mm, 165mm, 175mm, 185mm, 190mm, 195mm or 200mm.

[0127] It should be noted that if the distance D1 between the first connection position 220a and the second connection position 220b is too large, the excessive distance will reduce the support and constraint effect of the expansion beam 200 on the battery module 300. When the battery device 1000 is subjected to external force, because the connection positions 220 between the expansion beams 200 are too far apart, they cannot work together effectively, and the external force cannot be evenly distributed and transmitted. This can easily cause the local structure to bear large stress, thereby causing local deformation or twisting, and thus affecting the stability and structural integrity of the entire battery device 1000. In addition, an excessively large distance will cause the beam segment 210 of the expansion beam 200 to be too long, increasing the manufacturing difficulty of the beam segment 210.

[0128] In this embodiment, the spacing D1 between adjacent first connection positions 220a and second connection positions 220b satisfies: 100mm ≤ D1 ≤ 200mm. This not only ensures that the expansion beams 200 provide good support and constraint for the battery module 300, effectively dispersing external forces, reducing the probability of excessive stress concentration, and lowering the risk of deformation or damage to the connection positions 220 due to excessive force, but also improves the overall structural stability of the battery device 1000. When the battery device 1000 is subjected to loads in different directions, the force can be transmitted and balanced within a reasonable spacing, improving the deformation resistance of the battery device 1000. Thus, it avoids coupling effects and local stress concentration due to excessively small spacing, and also avoids support discontinuity problems due to excessively large spacing, improving the collaborative working effect between the expansion beams 200 and enhancing the reliability and durability of the battery device 1000.

[0129] In the above technical solution, since the distance D1 between adjacent first connection positions 220a and second connection positions 220b satisfies: 100mm≤D1≤200mm, it can effectively disperse external forces, reduce stress concentration and the probability of deformation and damage of connection positions 220, and improve structural stability; it can also balance the transmission of forces, enhance the deformation resistance of battery device 1000, and improve reliability and durability; it is also conducive to achieving a balance between the compactness and functionality of battery device 1000.

[0130] It should be noted that when two beam segments 210 are directly butted together in the first direction X, the connection position 220 refers to the butt joint between the two beam segments 210. In this case, the distance between adjacent first connection positions 220a and second connection positions 220b in the first direction X refers to the minimum distance between the two butt joints in the first direction X. In some examples, the direct butt joint of the two beam segments 210 can be achieved by directly buttting and welding the two beam segments 210 together, or by wrapping the butt joint of the two beam segments 210 with a wrapping (or binding) and then fixing the two beam segments 210 to the wrapping.

[0131] like Figure 4As shown, when two beam segments 210 are lapped together in the first direction X, the connection position 220 refers to the lap area between the two beam segments 210. At this time, in the first direction X, the distance between adjacent first connection positions 220a and second connection positions 220b can be: the distance from the lap start position of a beam segment 210 on the first connection position 220a of the first expansion beam 200a to the lap start position of the corresponding beam segment 210 on the second connection position 220b of the second expansion beam 200b (i.e., the beam segment 210 on the same side in the first direction X).

[0132] In other examples, when the length of the overlapping area is short, the spacing between adjacent first connection positions 220a and second connection positions 220b in the first direction X can also refer to the spacing between the opposite edges of the first connection position 220a and the second connection position 220b.

[0133] It should be noted that the distance D1 between the first connection position 220a and the second connection position 220b in the first direction X can be measured using measuring tools such as calipers, measuring tapes, and laser rangefinders.

[0134] The following describes the method for measuring the distance D1 between the first connecting position 220a and the second connecting position 220b in the first direction X, using calipers as an example.

[0135] First, select a caliper with an appropriate range and accuracy, ensuring the vernier caliper is in normal working condition, the measuring jaws open and close smoothly, and calibrate it to eliminate zero-point error. Second, perform the measurement: Since the first connecting position 220a and the second connecting position 220b are offset in the second direction Y, the caliper needs to be measured along the first direction X. Align the outer measuring jaws of the caliper with the first connecting position 220a and the second connecting position 220b respectively, ensuring the measuring jaws are perpendicular to the surface of the connecting position 220a and are in close contact to guarantee measurement accuracy. Third, read the data: Read the value displayed on the caliper; this value is the distance D1 between adjacent first connecting positions 220a and second connecting positions 220b. If using a vernier caliper, read the scale values ​​on the main scale and vernier scale, and calculate the final measurement result based on the vernier caliper's accuracy; if using a digital caliper, directly read the value displayed on the screen.

[0136] In some embodiments of this utility model, such as Figure 4 As shown, in the first direction X, the length L of beam segment 210 is less than or equal to 1.2m.

[0137] For example, in the first direction X, the length L of beam segment 210 can be 0.5m, 0.55m, 0.6m, 0.65m, 0.7m, 0.75m, 0.8m, 0.85m, 0.9m, 0.95m, 1m, 1.05m, 1.15m or 1.2m.

[0138] In this embodiment, the length L of beam segment 210 is less than or equal to 1.2m, which prevents the beam segment 210 from becoming too long. A shorter beam segment 210 helps enhance the structural stability of the expansion beam 200 and improves the stability of the battery device 1000. When subjected to internal and external forces, such as battery expansion force and external impact force, a shorter beam segment 210 reduces bending deformation and stress concentration in the expansion beam 200. Because a shorter beam segment 210 has a stronger resistance to deformation in the first direction X, the probability of excessively long beam segments 210 undergoing large flexural deformation under stress is reduced, ensuring the structural stability of the battery device 1000.

[0139] Meanwhile, processing shorter beam segments 210 is relatively easier, allowing for better control of manufacturing precision and improving production efficiency. Furthermore, shorter beam segments 210 require less material, reducing material costs. They also offer greater flexibility in raw material specifications, facilitating procurement and storage, thus saving overall costs and ensuring consistent product quality.

[0140] In addition, the shorter beam segment 210 is more conducive to the transmission and distribution of force, reducing the probability of local weakness that may occur due to the excessive length of the beam segment 210, making the mechanical performance of the entire battery device 1000 more balanced in the first direction X, and enabling the battery device 1000 to operate more reliably.

[0141] In the above technical solution, since the length L of the beam segment 210 in the first direction X is less than or equal to 1.2m, the structural stability of the beam segment 210 can be improved, and the probability of deformation and stress concentration of the beam segment 210 can be reduced; the production efficiency of the beam segment 210 can also be improved and the cost reduced; the force transmission and dispersion on the expansion beam 200 can also be optimized, and the overall performance of the battery device 1000 can be enhanced.

[0142] In some embodiments of this utility model, such as Figure 4 As shown, in the first direction X, the length of beam segment 210 is less than or equal to 1m.

[0143] For example, in the first direction X, the length L of beam segment 210 can be 0.5m, 0.52m, 0.58m, 0.62m, 0.68m, 0.75m, 0.72m, 0.78m, 0.82m, 0.88m, 0.92m, or 0.98m, etc.

[0144] In the above technical solution, since the length L of the beam segment 210 in the first direction X is less than or equal to 1m, the structural stability of the beam segment 210 can be further improved, and the probability of deformation and stress concentration of the beam segment 210 can be further reduced. It can also further improve the production efficiency of the beam segment 210, reduce costs, further optimize the force transmission and dispersion on the expansion beam 200, and enhance the overall performance of the battery device 1000.

[0145] In some embodiments of this utility model, such as Figure 4 As shown, in the first direction X, the length L of beam segment 210 is greater than or equal to 60cm.

[0146] In this embodiment, the length L of beam segment 210 is ≥ 60cm. A longer beam segment 210 provides better structural continuity. In the battery device 1000, it helps to connect different components and form a coherent support system. This allows the battery device 1000 to better distribute and transmit forces evenly when subjected to external impacts and internal expansion forces, thereby enhancing the overall structure's collaborative working ability.

[0147] Meanwhile, the longer beam segment 210 can cover a larger area in the first direction X, providing reliable support for the battery module 300, reducing the probability of excessive local stress, improving the stability and load-bearing capacity of the battery device 1000 in the first direction X, ensuring the reliable operation of the battery device 1000, and also reducing the number of beam segments 210, reducing the number of parts of the battery device 1000, and improving assembly efficiency.

[0148] In the above technical solution, since the length L of the beam segment 210 is greater than or equal to 60cm, the structural continuity of the beam segment 210 can be enhanced, a coherent support system can be provided, the support range can be expanded, the force can be evenly distributed, the stability and load-bearing capacity of the battery device 1000 can be improved, and the reliable operation of the battery device 1000 can be guaranteed.

[0149] It should be noted that the length L of beam segment 210 can be measured using measuring tools such as tape measure, steel ruler and laser rangefinder.

[0150] The following describes the method for measuring the length L of beam segment 210, using a steel ruler as an example.

[0151] First, ensure the steel ruler's scale is clear and legible, without wear or damage to avoid affecting the measurement results. Clean the measuring surface of beam segment 210, ensuring there are no debris or protrusions that could affect the fit between the steel ruler and beam segment 210. Second, perform the measurement: Align the zero mark of the steel ruler with one end of beam segment 210, placing the steel ruler as long as possible along the length of beam segment 210, ensuring a tight fit between the steel ruler and beam segment 210, avoiding tilting or bending, which would lead to measurement errors. If beam segment 210 is long, it can be measured in segments, and the measurements of each segment can be added together to obtain the total length. For curved beam segment 210, a soft measuring tape can be used to fit along the contour of beam segment 210, and the length of the measuring tape can be measured with the steel ruler. Third, read the data: Observe the corresponding scale on the steel ruler at the other end of beam segment 210 and read the accurate value; this value is the length of beam segment 210. When measuring in segments, ensure that the units are consistent when adding the measurement results of each segment to ensure the accuracy of the final result.

[0152] It should be noted that, in the actual measurement process, appropriate measuring tools and methods should be selected according to the specific conditions of beam segment 210 and the required measurement accuracy. For example, for situations where high accuracy is required and beam segment 210 is easily accessible, a steel ruler can be used; for long-distance or hard-to-reach beam segments 210, a laser rangefinder may be more convenient; while for situations where high accuracy is not required and the measurement environment is relatively relaxed, a measuring tape is a good choice.

[0153] In some embodiments of this utility model, such as Figure 6 and Figure 7 As shown, in the first direction X, the length L0 of the box 100 is greater than or equal to 1.8m and less than or equal to 2m.

[0154] For example, in the first direction X, the length L0 of the box 100 can be 1.8m, 1.85m, 1.9m, 1.95m or 2m, etc.

[0155] It should be noted that when the length direction of the housing 100 is along the first direction X, and the multiple battery modules 300 of the battery device 1000 are arranged along the length direction of the housing 100, the total length of the multiple battery modules 300 in the length direction of the housing 100 is relatively long. To achieve the installation and fixation of the multiple battery modules 300, the expansion beam 200 extends along the length direction of the housing 100, and the length of the expansion beam 200 is also relatively long. To facilitate the production of the expansion beam 200 and reduce the manufacturing difficulty of the expansion beam 200, within the length range of this housing 100, the expansion beam 200 is divided into multiple beam segments 210 to improve the processing efficiency of the expansion beam 200 and reduce production costs. Meanwhile, in order to reduce the risk of stress concentration in the box 100 caused by the splicing of multiple beam segments 210 of the expansion beam 200, and to improve the uniformity of stress distribution of the battery device 1000 under stress, the connection positions 220 of the beam segments 210 of the two expansion beams 200 are staggered in the second direction Y, so as to effectively disperse the stress on the two expansion beams 200, improve the structural stability, torsional resistance and overall stiffness of the battery device 1000, and improve the mechanical properties of the battery device 1000.

[0156] When the length of the housing 100 is relatively long, the width of the housing 100 can be reduced while arranging the same number of battery cells 310 in the battery assembly 1000. This facilitates the assembly of the battery assembly 1000, allowing it to be adapted to more types of vehicles and improving the vehicle's space utilization. Furthermore, with the same width of the housing 100, a longer length allows for the placement of more battery cells 310, thereby increasing the energy density of the battery assembly 1000.

[0157] In some examples, such as Figure 7 As shown, the ratio of the length L0 of the housing 100 in the first direction X to the width W0 of the housing 100 in the second direction Y is greater than 2. Specifically, the outer contour of the housing 100 can be a cuboid shape, and the length L0 of the housing 100 is greater than twice the width W0 of the housing 100. For example, the ratio of the length L0 to the width W0 of the housing 100 can be 2.2, 2.4, 2.6, 2.8, 3, 3.2, 3.5, or 4 or higher, etc. In this case, the housing 100L0 is a long box shape with a length much greater than its width W0. As a result, the battery device 1000 can have a narrower width, reducing the space occupied in the width direction and facilitating the assembly of the battery device 1000.

[0158] In some examples, the ratio of the height of the housing 100 in the third direction Z to the width W0 of the housing 100 in the second direction Y is less than 0.3, and the third direction Z intersects the second direction Y. For example, the outer contour of the housing 100 is a cuboid shape, and the ratio of the height of the housing 100 to the width W0 of the housing 100 is less than 0.3. The ratio of the height to the width W0 of the housing 100 can be 0.3, 0.29, 0.28, 0.27, 0.26, 0.25, 0.23, 0.21, 0.2, 0.18, and 0.15, etc. In this case, the housing 100 is a low-profile box shape with a height much smaller than its width. This allows the battery device 1000 to have a thinner profile, which is beneficial for the assembly of the battery device 1000 and reduces the space occupied in the height direction.

[0159] In some examples, the thickness of the housing 100 in the third direction Z is greater than or equal to 20 mm and less than or equal to 50 mm, and the third direction Z intersects with the first direction X. For example, the thickness of the housing 100 can be 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, or 50 mm, etc. This allows the battery device 1000 to have a thinner profile, which is beneficial for the assembly of the battery device 1000 and optimizes the positional arrangement of the battery device 1000.

[0160] In the above technical solution, since the length L0 of the housing 100 is greater than or equal to 1.8m and less than or equal to 2m, the expansion beam 200 includes multiple beam segments 210 connected in sequence, and the connection positions 220 of the beam segments 210 of the two expansion beams 200 are staggered in the second direction Y. This can not only effectively disperse the stress on the two expansion beams 200, improve the structural stability, torsional resistance and overall stiffness of the battery device 1000, and improve the mechanical performance of the battery device 1000, but also improve the energy density of the battery device 1000, reduce the width of the housing 100, facilitate the assembly of the battery device 1000, adapt to more types of vehicles, and improve the space utilization of the vehicle.

[0161] It should be noted that the length L0 of the box 100 can be measured using measuring tools such as a tape measure, steel ruler, and laser rangefinder.

[0162] The method for measuring the length L0 of box 100 using a steel ruler is basically the same as the method for measuring the length L of beam segment 210 mentioned above, and will not be repeated here. The following describes the method for measuring the length L0 of box 100 using a laser rangefinder as an example.

[0163] First, select a suitable laser rangefinder based on the length and accuracy requirements of the enclosure 100. Check the rangefinder's battery level, clean its transmitter and receiver ports, and determine measurement points on a straight line at both ends along the length of the enclosure 100. Second, turn on the laser rangefinder and wait for the self-test to complete before selecting single-measurement mode. First, accurately aim the laser beam at one measurement point on the enclosure 100 and press the measurement button to record the distance. Then, keeping the instrument stable, aim the laser beam at the other measurement point and repeat the measurement and recording. Third, for calculation, if the instrument has the relevant function, the length of the enclosure 100 can be directly obtained; otherwise, manually calculate it by subtracting the first measurement value from the second. Fourth, to improve accuracy, multiple measurements can be taken and the average value taken as the final result.

[0164] In some embodiments of this utility model, such as Figure 6 and Figure 7 As shown, the battery device 1000 includes multiple battery modules 300, which are all housed in the housing 100 and arranged sequentially along the first direction X. Two expansion beams 200 are respectively arranged on both sides of the multiple battery modules 300 in the second direction Y.

[0165] In some examples, such as Figure 6 and Figure 7 As shown, the battery device 1000 may include two, three, four, five, six, seven, or more battery modules 300. Multiple battery modules 300 may be arranged side-by-side sequentially along a first direction X. For example... Figure 6 As shown, the battery device 1000 includes three battery modules 300, which are arranged sequentially along the front-to-back direction of the housing 100. By incorporating multiple battery modules 300, the battery device 1000 in this embodiment can improve its overall power output and capacity. Furthermore, by flexibly combining different numbers of battery modules 300, it can meet various power demands. The modular design of the battery modules 300 facilitates troubleshooting and individual replacement, significantly improving maintenance efficiency, reducing repair costs, and extending the service life of the battery device 1000.

[0166] like Figure 6 and Figure 7 As shown, two expansion beams 200 are respectively arranged on both sides of multiple battery modules 300 in the second direction Y. The two ends of the multiple battery modules 300 in the second direction Y are respectively fixedly connected to the two expansion beams 200. The two expansion beams 200 can not only fix the multiple battery modules 300 in the housing 100, but also limit the displacement of the battery modules 300 in the second direction Y, limit the expansion of the multiple battery cells 310 in the battery modules 300 in the second direction Y, and improve the stability of the operation of the battery device 1000.

[0167] In the above technical solution, since the battery device 1000 includes multiple battery modules 300 arranged along the first direction X, and the two ends of the multiple battery modules 300 in the second direction Y are respectively connected to two expansion beams 200, the expansion beams 200 can not only enhance the structural stability of the battery device 1000, but also disperse the expansion stress and external impact force of the battery modules 300. The modular design of the battery modules 300 is not only conducive to the thermal management of the battery device 1000 and improves the thermal management efficiency, but also facilitates the modular maintenance of individual battery modules 300, making it easy to disassemble and replace, reducing maintenance costs, and extending the service life of the battery device 1000.

[0168] In some embodiments of this utility model, such as Figure 6 and Figure 7 As shown, a battery compartment 101 is defined within the housing 100, and in the first direction X, the length L1 of the battery compartment 101 is greater than or equal to 1m.

[0169] In some examples, such as Figure 6 and Figure 7 As shown, a partition beam 130 is provided inside the housing 100. The partition beam 130 extends along the second direction Y and divides the space inside the housing 100 into an electrical compartment and a battery compartment 101 arranged in the first direction X. Multiple battery modules 300 are located in the battery compartment 101. The battery management system and high-voltage box of the battery device 1000 can be located in the electrical compartment.

[0170] In some examples, such as Figure 6 As shown, the length L1 of the battery compartment 101 in the first direction X can be 1m, 1.1m, 1.2m, 1.3m, 1.4m, 1.5m, 1.6m, 1.7m, 1.8m, 1.9m, 2m, 2.1m, 2.2m, 2.3m, 2.4m or 2.5m or more.

[0171] Since multiple battery modules 300 are arranged in the first direction X, the total length of the multiple battery modules 300 arranged in the first direction X is approximately equal to the length L1 of the battery compartment 101. Thus, the total length of the multiple battery modules 300 arranged within the battery compartment 101 is also greater than or equal to 1m. At this point, in order to achieve the fixed connection of the expansion beam 200 with the multiple battery modules 300, the total length of the expansion beam 200 in the first direction X is also approximately equal to the length L1 of the battery compartment 101, i.e., the total length of the expansion beam 200 in the first direction X is greater than or equal to 1m.

[0172] When the length of the expansion beam 200 is greater than or equal to 1m, the length of the expansion beam 200 is too long. If an integral expansion beam 200 is used, the processing difficulty is relatively large. Therefore, in this embodiment, when the length of the battery compartment 101 is greater than or equal to 1m, the expansion beam 200 is divided into multiple beam segments 210. This can reduce the processing difficulty of the expansion beam 200, improve the processing efficiency of the expansion beam 200, and reduce the production cost. At the same time, when the length of the battery compartment 101 is greater than or equal to 1m, the expansion beam 200 is spliced ​​and connected by multiple beam segments 210. The connection positions 220 of the beam segments 210 of two expansion beams 200 are staggered in the second direction Y. This can also improve the uniformity of stress distribution of the battery device 1000 under stress, effectively disperse the stress on the two expansion beams 200, improve the structural stability, torsional resistance and overall stiffness of the battery device 1000, and improve the mechanical performance of the battery device 1000.

[0173] In the above technical solution, since the length L1 of the battery compartment 101 in the first direction X is greater than or equal to 1m, the expansion beam 200 is set as multiple beam segments 210 connected in sequence, and the connection positions 220 of the beam segments 210 of the two expansion beams 200 are staggered in the second direction Y. This not only reduces the processing difficulty of the expansion beam 200, but also effectively disperses the stress on the two expansion beams 200, improves the structural stability, torsional resistance and overall stiffness of the battery device 1000, and improves the mechanical properties of the battery device 1000.

[0174] In some embodiments of this utility model, such as Figure 6 and Figure 7 As shown, in the first direction X, the length L1 of the battery compartment 101 is greater than or equal to 1.4m.

[0175] In some examples, such as Figure 6 and Figure 7 As shown, the length L1 of the battery compartment 101 in the first direction X can be 1.4m, 1.45m, 1.55m, 1.65m, 1.75m, 1.85m, 1.95m, 2.05m, 2.15m, 2.25m, 2.35m, 2.45m or 2.55m or more.

[0176] In the above technical solution, since the length L1 of the battery compartment 101 in the first direction X is greater than or equal to 1.4m, the battery compartment 101 is relatively long. The expansion beam 200 is set as multiple beam segments 210 connected in sequence, and the connection positions 220 of the beam segments 210 of the two expansion beams 200 are staggered in the second direction Y. This not only reduces the processing difficulty of the expansion beam 200, but also effectively disperses the stress on the two expansion beams 200, improves the structural stability, torsional resistance and overall stiffness of the battery device 1000, and improves the mechanical performance of the battery device 1000.

[0177] It should be noted that the length L1 of the battery compartment 101 in the first direction X can be measured using measuring tools such as a laser rangefinder, a measuring tape, or a coordinate measuring machine. The method for measuring the length L1 of the battery compartment 101 in the first direction X using a laser rangefinder is basically the same as the method for measuring the length L0 of the housing 100 described above, and will not be repeated here. The following describes the method for measuring the length L1 of the battery compartment 101 in the first direction X using a coordinate measuring machine as an example.

[0178] First, preheat the equipment to ensure stability. Clean the battery compartment 101 to remove any impurities or interference. Secure the housing 100 to the worktable using clamps and adjust its position so that the first direction X is approximately parallel to the axis of the measuring instrument's coordinate system. Second, establish a coordinate system corresponding to the actual position and direction of the battery compartment 101 in the measuring instrument software by measuring the reference surface, reference line, or reference point on the battery compartment 101. Set key parameters such as probe type, probe length, measurement speed, and trigger force according to the characteristics of the battery compartment 101. Third, measurement operation: Select representative measurement points at both ends of the battery compartment 101 in the first direction X, such as the center of the end face or a specific position on the edge. Operate the handle to make the probe perpendicular to the measurement point and automatically record the coordinate values. To improve reliability, take multiple measurements at each measurement point and take the average value. Fourth, data processing and result acquisition: The software calculates the distance in the first direction X, i.e., L1, based on the coordinate values ​​of the measurement points.

[0179] In some embodiments of this utility model, such as Figure 6 and Figure 7 As shown, the width dimension of the battery module 300 in the first direction X is the module width W, and the ratio of the length L of the beam segment 210 to the module width W is greater than or equal to 1.1.

[0180] In some examples, the ratio of the length L of beam segment 210 to the module width W can be 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5 or 3 or more.

[0181] In the above technical solution, since the length L of the beam segment 210 is at least greater than or equal to 1.1 times the width W of the module, the beam segment 210 is not too short. The relatively long beam segment 210 can not only better disperse the expansion force generated by the charging and discharging of the battery module 300, reduce the risk of stress concentration, and improve the support stability of the battery module 300, but also reduce the number of beam segments 210. This improves assembly efficiency and reduces the risk of loosening of the connection at the connection position 220. On the other hand, it frees up more space for the battery module 300 and increases energy density.

[0182] In some embodiments of this utility model, such as Figure 6 and Figure 7As shown, the ratio of the length L of beam segment 210 to the module width W is greater than or equal to 1.5.

[0183] In other words, the length L of beam segment 210 is at least greater than or equal to 1.5 times the module width W. For example, the ratio of the length L of beam segment 210 to the module width W can be 1.55, 1.65, 1.75, 1.85, 1.95, 2.05, 2.15, 2.25, 2.35, 2.45, 2.55, 2.8 or 3 or more.

[0184] In the above technical solution, since the length L of the beam segment 210 is greater than or equal to 1.5 times the module width W, the length of the beam segment 210 can be further increased, the number of beam segments 210 can be reduced, the assembly efficiency can be improved, the risk of loose connection at the connection position 220 can be reduced, the expansion force generated by the charging and discharging of the battery module 300 can be further effectively dispersed, the support stability of the battery module 300 can be improved, and more space can be freed up for the battery module 300 to increase the energy density.

[0185] It should be noted that the module width W of the battery module 300 in the first direction X can be measured using measuring tools such as a tape measure, vernier caliper, or micrometer. The method for measuring the module width W of the battery module 300 in the first direction X using a vernier caliper is essentially the same as the method described above for measuring the distance D1 between the first connecting position 220a and the second connecting position 220b in the first direction X using a vernier caliper, and will not be repeated here. The following description uses a tape measure as an example to illustrate the method for measuring the module width W.

[0186] First, place the battery module 300 stably on a horizontal surface, ensuring it is upright and free from tilting or twisting. Second, align the zero mark of a measuring tape with one edge of the battery module 300 in the first direction (X), keeping the measuring tape parallel to the edge of the battery module 300. Third, stretch the measuring tape to the other edge of the battery module 300 and read the scale value at the point where the tape aligns with that edge. This is an approximate value for the module width W. It should be noted that due to the limited accuracy of the measuring tape, the measurement result may contain some error.

[0187] In some embodiments of this utility model, such as Figure 6 and Figure 7 As shown, a gap space 102 is formed between two adjacent battery modules 300 in the first direction X, and at least a portion of the connection positions 220 of the plurality of beam segments 210 are offset from the gap space 102 in the second direction Y.

[0188] The gap space 102 between the two battery modules 300 refers to the pre-reserved gap space between adjacent battery modules 300 in the first direction X, that is, the space defined between the two facing surfaces of the two battery modules 300 in the first direction X. The gap space 102 serves as a channel for airflow inside the battery device 1000, allowing the heat generated by the battery modules 300 to dissipate in a timely manner, maintaining the battery modules 300 within a suitable operating temperature range, improving the charging and discharging efficiency of the battery modules 300, and extending the service life of the battery device 1000.

[0189] In some examples, when the battery device 1000 includes two battery modules 300, a gap space 102 is formed between the two battery modules 300. When the battery device 1000 includes three battery modules 300, two gap spaces 102 are formed between the three battery modules 300. That is, when the battery device 1000 includes S battery modules 300, where S is a positive integer greater than or equal to 2, S-1 gap spaces 102 are formed between the S battery modules 300.

[0190] In some examples, at least a portion of the first connection positions 220a are offset from the gap space 102 in the second direction Y. In other words, only a portion of the first connection positions 220a may be offset from the gap space 102 in the second direction Y, while the remaining first connection positions 220a are directly opposite the gap space 102 in the second direction Y. Alternatively, all the first connection positions 220a may be offset from the gap space 102 in the second direction Y.

[0191] In some examples, at least a portion of the second connection positions 220b are offset from the gap space 102 in the second direction Y. In other words, only a portion of the second connection positions 220b may be offset from the gap space 102 in the second direction Y, while the remaining second connection positions 220b are directly opposite the gap space 102 in the second direction Y. Alternatively, all the second connection positions 220b may be offset from the gap space 102 in the second direction Y.

[0192] The connection position 220 and the gap space 102 are offset in the second direction Y, meaning that in a projection plane perpendicular to the second direction Y, the projection of the connection position 220 and the projection of the gap space 102 do not coincide at all. When there are multiple connection positions 220 and / or multiple gap spaces 102, all the multiple connection positions 220 and multiple gap spaces 102 are completely offset in the second direction Y.

[0193] It should be noted that the existence of the gap space 102 interrupts the continuity between adjacent battery modules 300. For the battery device 1000, the location corresponding to the gap space 102 is a structurally weak area, which can easily lead to stress concentration when the battery device 1000 is under stress. Furthermore, when the connection position 220 is aligned with the gap space 102 in the second direction Y, since the gap space 102 already interrupts the continuity of the battery module 300, the alignment of the connection position 220 with the gap space 102 will cause the structurally weak area of ​​the connection position 220 to coincide with the structurally weak area of ​​the battery module 300. Under the action of external force, the stress on this aligned position will be too great, which may cause the connection position 220 to loosen or break, reduce the overall structural stability, and increase the risk of damage to the battery device 1000.

[0194] In the above technical solution, since the connection positions 220 of multiple beam segments 210 and the gap space 102 are staggered in the second direction Y, the risk of structural weak points caused by the overlap of the connection positions 220 and the gap space 102 can be effectively reduced. When the battery device 1000 is subjected to external impact or the expansion force of the battery module 300 itself, since the connection positions 220 and the gap space 102 are relatively evenly distributed in the first direction X, the force can be more evenly distributed to each beam segment 210 and the battery module 300, reducing the probability of stress concentration in a certain area, thereby enhancing the structural stability of the entire battery device 1000 and reducing the risk of deformation or damage to the battery device 1000.

[0195] In some embodiments of this utility model, such as Figure 7 As shown, in the first direction X, the distance D2 between the connection position 220 and the gap space 102 is greater than or equal to 100mm.

[0196] For example, such as Figure 7 As shown, in the first direction X, the distance D2 between the connection position 220 and the gap space 102 can be 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, 280mm, 290mm or 300mm and above, etc.

[0197] In the above technical solution, since the distance D2 between the connection position 220 and the gap space 102 in the first direction X is ≥100mm, the offset distance between the connection position 220 and the gap space 102 can be increased. When the battery device 1000 is subjected to external force, the two expansion beams 200 and the multiple battery modules 300 can distribute the stress more evenly and transmit the force more evenly to the entire structure of the battery device 1000. This further reduces the risk of local stress concentration caused by the small spacing and further improves the structural stability and reliability of the battery device 1000.

[0198] It should be noted that the distance D2 between the connection position 220 and the gap space 102 in the first direction X can be measured using measuring tools such as a tape measure, vernier caliper, and laser rangefinder. The method for measuring the distance D2 between the connection position 220 and the gap space 102 in the first direction X using a tape measure is basically the same as the method for measuring the module width W using a tape measure, and will not be repeated here. The method for measuring the distance D2 between the connection position 220 and the gap space 102 in the first direction X using a vernier caliper is basically the same as the method for measuring the distance D1 between the first connection position 220a and the second connection position 220b in the first direction X using a vernier caliper, and will not be repeated here. The method for measuring the distance D2 between the connection position 220 and the gap space 102 in the first direction X using a laser rangefinder is basically the same as the method for measuring the length L0 of the housing 100 using a laser rangefinder, and will not be repeated here.

[0199] In some embodiments of this utility model, such as Figure 7 As shown, in the projection plane perpendicular to the second direction Y, the projection of any connection position 220 is completely located within the projection of one of the battery modules 300, and in the first direction X, the projection of the connection position 220 is located within the range of 1 / 4 to 3 / 4 of the projection of the corresponding battery module 300.

[0200] For example, in a projection plane perpendicular to the second direction Y, the projection of the connection position 220 can coincide with the projection of the corresponding battery module 300 at the 3 / 10, 2 / 5, 1 / 2, 3 / 5, or 7 / 10 position in the first direction X.

[0201] It should be noted that when the projection of the connection position 220 is too close to the edge of the projection of the battery module 300 (for example, less than 1 / 4 of the range), if the connection position 220 is under stress, the supporting force of the battery module 300 on the expansion beam 200 will be unevenly distributed, which will lead to local stress concentration at the connection position 220.

[0202] In the above technical solution, by making the projection of the connection position 220 fall within the range of 1 / 4 to 3 / 4 of the projection of the corresponding battery module 300 in the first direction X, the connection position 220 can be fully supported by the battery module 300. When the battery device 1000 is subjected to external force, the stress on the connection part can be effectively distributed to the entire battery module 300, reducing the risk of local stress concentration at the connection position 220 due to uneven force, thereby significantly enhancing structural stability.

[0203] In some embodiments of this utility model, such as Figure 8 As shown, fixing holes are formed on beam segment 210, and the two ends of battery module 300 in the second direction Y are fixedly connected to two expansion beams 200 through the fixing holes by fasteners.

[0204] In some examples, such as Figure 8 As shown, the battery module 300 has mounting holes at both ends in the second direction Y. Multiple mounting holes penetrate the battery module 300 in the third direction Z. Multiple mounting holes are arranged at intervals in the first direction X. Multiple fixing holes are formed on multiple beam segments 210 of the expansion beam 200. Multiple fixing holes correspond one-to-one with multiple mounting holes. Fasteners pass through the mounting holes and fixing holes in sequence to fix the battery module 300 to the beam segments 210.

[0205] In some examples, such as Figure 8 As shown, the battery module 300 includes end plates arranged on both sides of a plurality of battery cells 310 in the second direction Y. The end plates are arranged perpendicular to the second direction Y, and mounting holes penetrate the end plates along the third direction Z. Further, the third direction Z is the vertical direction, and the mounting holes and fixing holes are aligned in the third direction Z. The lower end face of the end plate is supported on the upper surface of the expansion beam 200. Thus, the arrangement of the end plates and the expansion beam 200 in the third direction Z reduces the space occupied in the second direction Y, resulting in a compact structure and improved energy density of the battery device 1000.

[0206] In the above technical solution, the battery module 300 is fixedly connected to the expansion beam 200 by fasteners, which not only reliably fixes the battery module 300 to the expansion beam 200, but also improves the installation and disassembly efficiency of the battery device 1000.

[0207] Module battery cell arrangement 310

[0208] In some embodiments of this utility model, such as Figure 8 As shown, the battery module 300 includes multiple battery cells 310, which are stacked in a row along the second direction Y, and the multiple rows of battery cells 310 are arranged in the first direction X to form the battery module 300.

[0209] For example Figure 8As shown, the battery device 1000 includes multiple battery modules 300. Each battery module 300 may include one or more rows of battery cells 310. In this embodiment of the present invention, the battery device 1000 includes three battery modules 300. The three battery modules 300 are arranged sequentially along a first direction X. Each battery module 300 includes two rows of battery cells 310 arranged side by side in the first direction X. Multiple battery cells 310 in each row of battery cells 310 are stacked in a second direction Y. The second direction Y is the thickness direction of the battery cells 310 and also the width direction of the housing 100. The first direction X is the length direction of the battery cells 310 and also the length direction of the housing 100.

[0210] Since the first direction X is the length direction of the housing 100 and the second direction Y is the width direction of the housing 100, when multiple battery cells 310 of the battery module 300 are stacked in a row along the second direction Y, the stacking direction of the multiple battery cells 310 in the thickness direction is along the width direction of the housing 100. This invention, by arranging multiple battery cells 310 in the battery module 300 stacked along the width direction of the housing 100, allows for the design and adjustment of the number of battery cells 310 in the width direction of the battery module 300 according to the dimensions of the housing 100, thereby improving the space utilization rate within the housing 100.

[0211] It should be noted that when the battery module 300 is arranged inside the housing 100, and the arrangement method in the relevant technology in which the thickness direction of the battery cell 310 is parallel to the length direction of the housing 100 and the length direction of the battery cell 310 is parallel to the width direction of the housing 100, the total number of battery cells 310 that can be arranged sequentially in the width direction of the housing 100 is: the quotient obtained by dividing the width dimension of the housing 100 by the length dimension of the battery cell 310 and then rounding down.

[0212] When the battery module 300 is arranged inside the housing 100, and the thickness direction of the battery cell 310 of this utility model is parallel to the width direction of the housing 100, and the length direction of the battery cell 310 is parallel to the length direction of the housing 100, the total number of battery cells 310 that can be arranged sequentially in the width direction of the housing 100 is: the quotient obtained by dividing the width dimension of the housing 100 by the thickness dimension of the battery cell 310 and then rounding down.

[0213] Since the thickness of the battery cell 310 is much smaller than its length, when the outer contour and width of the housing 100 are determined, the battery module 300 arrangement scheme of this utility model is adopted, in which the thickness direction of the battery cell 310 is parallel to the width direction of the housing 100, so that the battery cells 310 are stacked in the width direction of the housing 100. This allows for more flexible adaptation to the width of the housing 100, making full use of the space in the width direction of the housing 100 and improving the energy density of the battery device 1000.

[0214] In the above technical solution, since the battery module 300 includes multiple rows of battery cells 310 arranged along the first direction X, and multiple battery cells 310 in each row of battery cells 310 are stacked along the second direction Y, the number of battery cells 310 in the width direction of the battery module 300 can be designed and adjusted according to the dimensions of the housing 100, thereby improving the space utilization rate within the housing 100 and increasing the energy density of the battery device 1000.

[0215] In some embodiments of this utility model, such as Figure 6 As shown, two adjacent beam segments 210 are lapped together in the first direction X.

[0216] The lap joint connection of two beam segments 210 refers to the fact that, in the first direction X, the adjacent beam segments 210 partially overlap and fit together, and are then fixed by welding, bolts, or other means. This increases the contact area between the adjacent beam segments 210, achieving a stable connection and effective force transmission.

[0217] In the above technical solution, since the two adjacent beam segments 210 are lapped together, the contact area between the beam segments 210 can be increased, the force transmission can be more uniform, the stress can be effectively dispersed, the overall structural strength of the expansion beam 200 can be improved, and the risk of damage due to stress concentration at the connection can be reduced. At the same time, when assembling the expansion beam 200, the lapped connection does not require complex positioning and high-precision docking, which facilitates the positioning and assembly between the beam segments 210, makes the operation simple, and improves the assembly efficiency.

[0218] In some embodiments of this utility model, such as Figure 6 As shown, in the first direction X, the overlap length d1 of two adjacent beam segments 210 is greater than or equal to 50 mm.

[0219] For example, in the first direction X, the overlap length d1 of two adjacent beam segments 210 can be 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm or 200mm and above, etc.

[0220] In the above technical solution, since the overlap length d1 of two adjacent beam segments 210 is greater than or equal to 50mm, there can be a sufficient overlap length between the adjacent beam segments 210, which increases the contact area between the beam segments 210, so that the force between the beam segments 210 can be transmitted more evenly and stably, effectively disperses stress, significantly improves the overall structural strength, and reduces the risk of damage due to stress concentration at the connection.

[0221] In some embodiments of this utility model, such as Figure 6 As shown, in the first direction X, the overlap length d1 of two adjacent beam segments 210 is greater than or equal to 50 mm and less than or equal to 100 mm.

[0222] For example Figure 6 As shown, in the first direction X, the overlap length d1 of two adjacent beam segments 210 can be 53mm, 55mm, 58mm, 62mm, 65mm, 68mm, 72mm, 75mm, 78mm, 82mm, 85mm, 88mm, 92mm, 95mm or 98mm.

[0223] It should be noted that when the overlap length d1 of the two beam segments 210 is too short, for example, when the overlap length d1 of the two beam segments 210 is less than 50mm, the contact area between the beam segments 210 is small, the force transmission path is limited, which will cause stress to concentrate in a small area. The connection is prone to damage due to excessive stress. At the same time, the short overlap length makes it difficult to ensure the reliability of the connection between the beam segments 210. When the battery device 1000 is subjected to external force, local deformation or loosening may occur between the beam segments 210, affecting the stability of the battery module 300.

[0224] When the overlap length d1 of the two beam segments 210 is too long, for example, if the overlap length d1 of the two beam segments 210 is greater than 100mm, it will increase the material usage of the expansion beam 200 and the total weight of the battery device 1000, increasing costs and reducing the energy density of the battery device 1000. In addition, the excessively long overlap will also occupy too much installation space within the housing 100, making it difficult to assemble the internal parts of the battery device 1000 and affecting the compactness and rationality of the internal layout of the battery device 1000.

[0225] In the above technical solution, since the overlap length d1 of the beam segment 210 is greater than or equal to 50mm and less than or equal to 100mm, there is sufficient contact area between the beam segments 210, so that the stress is evenly distributed, the overall structural strength is enhanced, the expansion beam 200 can effectively resist external impact and vibration, and the material usage and weight of the expansion beam 200 can be effectively controlled, as well as the space occupied by the expansion beam 200, thereby reducing costs, increasing the energy density of the battery device 1000, and improving the space utilization and assembly efficiency within the battery device 1000.

[0226] It should be noted that the overlap length d1 of the two beam segments 210 can be measured using measuring tools such as a tape measure, vernier calipers, and a 3D laser scanner. The method for measuring the overlap length d1 of the two beam segments 210 using a tape measure is essentially the same as the method for measuring the module width W using a tape measure, and will not be repeated here. The method for measuring the overlap length d1 of the two beam segments 210 using a vernier caliper is essentially the same as the method for measuring the distance D1 between the first connection position 220a and the second connection position 220b in the first direction X using a vernier caliper, and will also not be repeated here.

[0227] In some embodiments of this utility model, two adjacent beam segments 210 in the first direction X are welded and / or fastened together.

[0228] In the above technical solution, the welding connection between two adjacent beam segments 210 can enhance the structural strength and stability of the connection position 220 and improve the impact resistance of the expansion beam 200. The tight connection between the two adjacent beam segments 210 makes the installation and disassembly of the beam segments 210 more convenient, which is beneficial to the maintenance and component replacement of the expansion beam 200 and improves maintenance efficiency.

[0229] In some embodiments of this utility model, the beam segment 210 includes a main body and a flange. The main body extends along the first direction X. The cross-section of the main body perpendicular to the first direction X is U-shaped and opens toward the bottom wall of the box 100. The flange is connected to both sides of the main body in the second direction Y and is fixedly connected to the bottom wall of the box 100.

[0230] In the above technical solution, the main body has a U-shaped cross-section, which enhances the structural strength and rigidity of the beam segment 210, effectively supports the weight of the battery module 300, reduces the probability of deformation of the beam segment 210 due to gravity or external forces, and improves the stability of the battery device 1000. The flange is fixed to the bottom wall of the housing 100, which not only increases the connection area between the beam segment 210 and the housing 100, making the connection more stable, but also allows the flange to better transfer the forces on the battery module 300 and the beam segment 210 to the housing 100, further strengthening the overall structural strength.

[0231] In some embodiments of this utility model, the flange is welded to the bottom wall of the box 100.

[0232] In the above technical solution, the flange is welded to the bottom wall of the box 100, which can enhance the connection strength and stability between the beam segment 210 and the bottom wall of the box 100, effectively transfer the stress of the battery module 300, and improve the overall structural reliability.

[0233] In some embodiments of this utility model, the width of the flange in the second direction Y is greater than or equal to 13mm.

[0234] For example, the width of the flange in the second direction Y can be 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm or 25mm or more.

[0235] In the above technical solution, the flange width in the second direction Y is greater than or equal to 13mm, which can increase the welding area between the flange and the bottom wall of the housing 100, enhance the connection stability between the flange and the bottom wall, make the force transmission more uniform, reduce stress concentration, and improve the overall structural strength. At the same time, the wider flange can also provide sufficient space for welding operations, ensure welding quality, and extend the service life of the battery device 1000.

[0236] In some embodiments of this utility model, drainage holes and / or weight reduction holes are formed on the beam segment 210.

[0237] The drainage holes are used to drain the electrophoresis solution during electrophoresis on beam segment 210, ensuring uniform coverage of the solution and improving electrophoresis quality and corrosion resistance. The weight-reduction holes reduce the weight of beam segment 210 without compromising its structural strength, thereby lowering the overall weight of the battery device 1000 and increasing energy density.

[0238] In the above technical solution, the drainage holes on the beam segment 210 can be used to drain liquid during electrophoresis, improve the electrophoresis quality, enhance the corrosion resistance of the beam segment 210, and the weight reduction holes can reduce the weight of the beam segment 210 and increase the energy density of the battery device by 1000.

[0239] In some embodiments of this utility model, the beam segment 210 is made of steel, aluminum or aluminum alloy.

[0240] In the above technical solution, the beam segment 210 is made of steel, which has high strength and good toughness, and can stably support the battery module 300 and adapt to complex working conditions; the aluminum component is lightweight, which can reduce the overall weight of the battery device 1000 and improve energy density; the aluminum alloy component can not only make the structure stable, but also meet the requirements of lightweighting.

[0241] Secondly, this utility model embodiment also provides an electrical device 1, including the battery device 1000 of any of the above embodiments.

[0242] In the above technical solution, since the power-consuming device 1 is equipped with the battery device 1000, the battery device 1000 can effectively disperse the stress on the two expansion beams 200 by staggering the first connection position 220a formed by the multiple beam segments 210 of the first expansion beam 200a and the second connection position 220b formed by the multiple beam segments 210 of the second expansion beam 200b. This reduces the probability of stress concentration and the formation of weak areas, improves the structural stability, torsional resistance and overall stiffness of the battery device 1000, improves the mechanical properties of the battery device 1000, reduces the risk of failure due to structural damage, and improves the reliability and stability of the battery device 1000, thereby improving the overall performance of the power-consuming device 1.

[0243] The following will refer to Figures 1-3 This invention describes a vehicle according to a specific embodiment of the present invention.

[0244] Reference Figure 1 The vehicle includes a battery unit 1000, which is located at the bottom of the vehicle and is used to power the vehicle.

[0245] Specifically, such as Figure 1 As shown, the battery device 1000 includes a housing 100, multiple battery modules 300, and a heat exchanger 400. The length of the housing 100 is along the front-rear direction of the vehicle, and the width is along the left-right direction of the vehicle. The housing 100 includes a bottom plate 110 and a top cover 120. The top cover 120 is placed on the upper side of the bottom plate 110 and cooperates with the bottom plate 110 to define an accommodating cavity. The bottom plate 110 is plate-shaped, and the front end of the bottom plate 110 is provided with an upwardly extending mounting plate. The top cover 120 is box-shaped with the lower side open. The front edge of the top cover 120 forms a clearance opening that matches the shape of the mounting plate. When the top cover 120 is placed on the bottom plate 110, the mounting plate covers the clearance opening.

[0246] Multiple ribs are also formed on the base plate 110. The multiple ribs extend to the left and right and are arranged at intervals in the front and back directions. The multiple ribs, the base plate 110 and the expansion beam 200 cooperate to define the receiving groove for accommodating multiple heat exchange tubes of the heat exchange element 400.

[0247] The heat exchanger 400 is arranged between the base plate 110 and the battery module 300. The heat exchanger 400 includes multiple heat exchange tubes, each of which is bent and extended and arranged in a receiving groove. The bending positions of the heat exchange tubes are all arc bends. The inner side of each heat exchange tube defines a heat exchange flow channel. At least a portion of each heat exchange flow channel is formed as a flow channel body. The flow channel bodies of the multiple heat exchange tubes are arranged sequentially in the front-back direction. The inlet and outlet of each heat exchange flow channel are arranged on the front side of the battery device 1000.

[0248] Each flow channel body includes a first heat exchange section and a second heat exchange section. The first heat exchange section includes two horizontal sections and one vertical section. The two horizontal sections extend laterally and are spaced apart in the front-to-back direction. The vertical section extends front-to-back and is arranged on one side of the two horizontal sections in the left-to-right direction. The front and rear ends of the vertical section are respectively connected to the ends of the two horizontal sections. At this time, the first heat exchange section is U-shaped with an opening facing one side in the left-to-right direction. The second heat exchange section is arranged between the two horizontal sections of the first heat exchange section. The second heat exchange section includes multiple horizontal sections that extend laterally, are spaced apart in the front-to-back direction, and are sequentially bent and connected.

[0249] In a specific example, there are two heat exchange tubes, one of which defines a first heat exchange channel on its inner side, and the other defines a second heat exchange channel on its inner side. The first heat exchange channel is entirely formed as a channel body and is arranged in front of the channel body of the second heat exchange channel.

[0250] The second heat exchange channel includes a first connecting part, a channel body and a second connecting part connected in sequence. The first connecting part and the second connecting part both extend in the front-back direction and are arranged at intervals in the left-right direction. The first connecting part and the second connecting part are both arranged on the side where the U-shaped opening of the first heat exchange part of the first heat exchange channel is located.

[0251] The first and second heat exchange channels extend from their respective inlets to outlets, with the ratio of the extension length of the second heat exchange channel to that of the first heat exchange channel being greater than or equal to 1 and less than or equal to 1.2. The width of the heat exchange channels is a first width, and the dimension of the battery cell 310 in the front-to-back direction is a second width; the ratio of the first width to the second width is greater than or equal to one-third. The bottom surface of the battery cell 310 is a first wall surface that mates with the heat exchange tubes, and the projected area of ​​the heat exchange tubes on the first wall surface is greater than one-third of the area of ​​the first wall surface. This improves the temperature rise or cooling rate of the battery cell 310.

[0252] The heat exchanger 400 also includes a first sleeve and a second sleeve. The first sleeve extends left and right, and its two ends are respectively connected to the inlet of the first heat exchange channel and the inlet of the second heat exchange channel. The second sleeve extends left and right, and its two ends are respectively connected to the outlet of the first heat exchange channel and the outlet of the second heat exchange channel. The heat exchanger also includes a liquid inlet pipe and a liquid outlet pipe. One end of the liquid inlet pipe is connected to the first sleeve and the other end is connected to a liquid inlet connector. One end of the liquid outlet pipe is connected to the second sleeve and the other end is connected to a liquid outlet connector. Both the liquid inlet connector and the liquid outlet connector are inserted through and fixed to the mounting plate at the front end of the base plate 110.

[0253] In this embodiment, the length of the housing 100 is along the front-to-back direction, and the length L0 of the housing 100 is greater than or equal to 1.8m and less than or equal to 2m. A partition beam 130 is provided inside the housing 100, which divides the space inside the housing 100 into a battery compartment 101 and an electrical compartment. The battery compartment 101 is located behind the electrical compartment, and the length L1 of the battery compartment 101 is greater than or equal to 1.4m in the front-to-back direction.

[0254] The housing 100 also includes expansion beams 200, which are disposed within the receiving cavity and fixed to the base plate 110. There are two expansion beams 200, extending front to back and positioned on the left and right sides of the base plate 110 near the edges. Multiple battery modules 300 are arranged sequentially in a front-to-back direction. Each battery module 300 includes two rows of battery cells 310, arranged side-by-side in the front-to-back direction. Multiple battery cells 310 within each row are stacked sequentially in a left-to-right direction, with the thickness of each battery cell 310 along the left-to-right direction. All battery modules 300 are positioned between the two expansion beams 200.

[0255] The two expansion beams 200 are designated as first expansion beam 200a and second expansion beam 200b, respectively. Both first expansion beam 200a and second expansion beam 200b comprise multiple beam segments 210. These beam segments 210 are connected in a front-to-back direction, overlapping each other. In the front-to-back direction, the overlap length d1 of two adjacent beam segments 210 satisfies: 50mm ≤ d1 ≤ 100mm. The connection position 220 of the multiple beam segments 210 in the first expansion beam 200a is designated as the first connection position 220a, and the connection position 220 of the multiple beam segments 210 in the second expansion beam 200b is designated as the second connection position 220b. Furthermore, the first connection position 220a and the second connection position 220b are staggered in the left-to-right direction.

[0256] In some specific examples, the first expansion beam 200a includes two beam segments 210 forming a first connection position 220a, and the second expansion beam 200b includes two beam segments 210 forming a second connection position 220b. Specifically, the first expansion beam 200a is arranged on the left side of the box body 100, and the length of the front beam segment 210 in the first expansion beam 200a is shorter than the length of the rear beam segment 210. The second expansion beam 200b is arranged on the right side of the box body 100, and the length of the front beam segment 210 in the second expansion beam 200b is longer than the length of the rear beam segment 210.

[0257] Furthermore, the length L of beam segment 210 in the front-rear direction satisfies: 60cm≤L≤1m, and the length of beam segment 210 is greater than or equal to 1.5 times the width of battery module 300 in the front-rear direction. The distance D1 between the first connection position 220a and the second connection position 220b in the front-rear direction satisfies: 100mm≤D1≤200mm.

[0258] Furthermore, a gap space 102 is formed between adjacent battery modules 300. Each first connection position 220a and second connection position 220b is offset from the gap space 102 in the left-right direction, and the distance D2 between the connection position 220 and the gap space 102 in the front-back direction is greater than or equal to 100mm. Furthermore, the connection position 220 is located within 1 / 4 to 3 / 4 of the front-back direction of the battery module 300 to which it is located.

[0259] Furthermore, the left and right beam segments 210 of the battery module 300 are both provided with end plates. The end plates are vertically arranged and supported on the upper side of the expansion beam 200. The end plates and the expansion beam 200 are fastened together by fasteners. The expansion beam 200 is welded to the bottom plate 110 of the housing 100 and / or connected by fasteners.

[0260] In the above technical solution, the battery cells 310 of the battery module 300 of the battery device 1000 are stacked in the left-right direction, and multiple battery modules 300 are arranged in the front-back direction. Two expansion beams 200 extend in the front-back direction and are arranged at intervals in the left and right directions. Each expansion beam 200 consists of at least two beam segments 210. The connection positions 220 of the expansion beams 200 on the left and right sides are staggered, and the stagger distance of the connection positions 220 of the expansion beams 200 on the two sides is ≥100mm. The projection of the connection positions 220 of the expansion beams 200 on the battery module 300 is placed within the width direction of the battery module 300, so that the gap space 102 between the battery modules 300 is staggered from the connection positions 220. This solves the problem of molding difficulties caused by the excessive length of the expansion beams 200, improves the rigidity of the expansion beams 200, and also improves the overall rigidity of the battery device 1000 by utilizing the rigidity of the battery module 300 itself.

[0261] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, include: Box (100); Two expansion beams (200) are provided inside the box body (100). The two expansion beams (200) extend along a first direction (X) and are spaced apart along a second direction (Y). The first direction (X) and the second direction (Y) intersect. Each of the two expansion beams (200) includes multiple beam segments (210) connected sequentially along the first direction (X). The two expansion beams (200) are respectively a first expansion beam (200a) and a second expansion beam (200b). Wherein, the connection position (220) of the plurality of beam segments (210) of the first expansion beam (200a) is the first connection position (220a), and the connection position (220) of the plurality of beam segments (210) of the second expansion beam (200b) is the second connection position (220b). The first connection position (220a) and the second connection position (220b) are staggered in the second direction (Y).

2. The battery device according to claim 1, characterized by In the first direction (X), the distance between the first connection position (220a) and the second connection position (220b) is greater than or equal to 100mm.

3. The battery device of claim 2, wherein, The distance between adjacent first connection positions (220a) and second connection positions (220b) in the first direction (X) is less than or equal to 200 mm.

4. The battery device of claim 1, wherein In the first direction (X), the length of the beam segment (210) is less than or equal to 1.2m.

5. The battery device of claim 4, wherein, In the first direction (X), the length of the beam segment (210) is less than or equal to 1m.

6. The battery device of claim 4, wherein In the first direction (X), the length of the beam segment (210) is greater than or equal to 60 cm.

7. The battery device of claim 1, wherein In the first direction (X), the length of the box (100) is greater than or equal to 1.8m and less than or equal to 2m.

8. The battery device according to any one of claims 1 to 7, characterized by, The battery device (1000) includes multiple battery modules (300), all of which are disposed inside the housing (100) and arranged sequentially along the first direction (X). Two expansion beams (200) are respectively arranged on both sides of the multiple battery modules (300) in the second direction (Y).

9. The battery device of claim 8, wherein, The housing (100) defines a battery compartment (101), and the length of the battery compartment (101) in the first direction (X) is greater than or equal to 1m.

10. The battery device of claim 9, wherein, In the first direction (X), the length of the battery compartment (101) is greater than or equal to 1.4m.

11. The battery device of claim 8, wherein, The width dimension of the battery module (300) in the first direction (X) is the module width, and the ratio of the length of the beam segment (210) to the module width is greater than or equal to 1.

1.

12. The battery device of claim 11, wherein, The ratio of the length of the beam segment (210) to the width of the module is greater than or equal to 1.

5.

13. The battery device of claim 8, wherein, A gap space (102) is formed between two adjacent battery modules (300) in the first direction (X), and at least a portion of the connection positions (220) of the plurality of beam segments (210) are offset from the gap space (102) in the second direction (Y).

14. The battery device of claim 13, wherein, The distance between the connection position (220) and the gap space (102) in the first direction (X) is greater than or equal to 100 mm.

15. The battery device of claim 13, wherein, In a projection plane perpendicular to the second direction (Y), the projection of any one of the connection positions (220) is completely located within the projection of one of the battery modules (300), and in the first direction (X), the projection of the connection position (220) is located within the range of 1 / 4-3 / 4 of the projection of the corresponding battery module (300).

16. The battery device of claim 8, wherein, The beam segment (210) is provided with a fixing hole, and the two ends of the battery module (300) in the second direction (Y) are fixedly connected with the two expansion beams (200) by fasteners penetrating through the fixing hole.

17. The battery device of claim 8, wherein, The battery module (300) comprises a plurality of battery monomers (310), and the plurality of battery monomers (310) are stacked in a column along the second direction (Y), and a plurality of columns of battery monomers (310) are arranged in the battery module (300) along the first direction (X).

18. The battery device of any one of claims 1-7, wherein, Two adjacent beam segments (210) in the first direction (X) are overlap-connected.

19. The battery device of claim 18, wherein, The overlap length of two adjacent beam segments (210) in the first direction (X) is greater than or equal to 50 mm.

20. The battery device of claim 18, wherein, The overlap length of two adjacent beam segments (210) in the first direction (X) is greater than or equal to 50 mm and less than or equal to 100 mm.

21. The battery device of any one of claims 1-7, wherein, Two adjacent beam segments (210) in the first direction (X) are welded and / or fastened.

22. The battery device of any one of claims 1-7, wherein, The beam segment (210) comprises a main body and a flange, the main body extends along the first direction (X), the cross section of the main body perpendicular to the first direction (X) is U-shaped and opens towards the bottom wall of the box (100), and the flange is connected to both sides of the main body in the second direction (Y) and is fixedly connected with the bottom wall of the box (100).

23. The battery device of claim 22, wherein, The flange is welded with the bottom wall of the box (100).

24. The battery device of claim 22, wherein, The width of the flange in the second direction (Y) is greater than or equal to 13 mm.

25. The battery device of any one of claims 1-7, wherein, The beam segment (210) is provided with a drainage hole and / or a weight-reducing hole.

26. The battery device of any one of claims 1-7, wherein, The beam segment (210) is a steel piece, an aluminum piece or an aluminum alloy piece.

27. An electrical device, comprising: The battery device (1000) of any one of claims 1-26 is provided.

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