Battery device and electric device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery device and a power utilization device. Wherein the battery device comprises a box body, battery monomers, a confluence piece and a limiting beam, the box body accommodates the limiting beam, the limiting beam and the box body jointly define a first accommodating space, and the first accommodating space accommodates a plurality of battery monomers; the confluence piece is electrically connected with the battery monomers and projects to a projection plane perpendicular to a first direction along the first direction, part of projection of the confluence piece is overlapped with projection of the limiting beam, and the first direction is the height direction of the battery monomers; in the first direction, a part of the confluence piece is bent towards the side where the limiting beam is located. According to the battery device, the structural layout in the battery device can be optimized, and the maintenance efficiency and the space utilization rate of the battery device are improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to battery devices and power-consuming devices. Background Technology

[0002] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0003] In battery-powered new energy vehicles, batteries can provide all or part of the power. In the energy storage field, batteries can be installed in energy storage boxes or directly on the user side. Within battery devices, the large size of the bridging busbars, when placed above the limiting beam, can easily obstruct the area where functional components are located, resulting in a large space occupation and negatively impacting the internal layout of the battery device. Therefore, optimizing the internal space layout of battery devices is one of the research topics in the industry. Utility Model Content

[0004] To solve the above-mentioned technical problems, this application provides a battery device and an electrical device.

[0005] This application is achieved through the following technical solution.

[0006] A first aspect of this application provides a battery device, which in some embodiments includes a housing, battery cells, a busbar, and a limiting beam. The housing houses the limiting beam, and the limiting beam and the housing together define a first accommodating space, which houses a plurality of battery cells. The busbar is electrically connected to the battery cells and projects along a first direction onto a projection plane perpendicular to the first direction. A portion of the projection of the busbar overlaps with the projection of the limiting beam. The first direction is the height direction of the battery cells. Along the first direction, a portion of the busbar bends toward the side where the limiting beam is located.

[0007] In the technical solution of this application embodiment, since the projection of the busbar along the first direction partially overlaps with the projection of the limiting beam, and a part of the busbar bends toward the side where the limiting beam is located, the size of the busbar in the perpendicular direction is reduced to a certain extent, the busbar occupies the first accommodating space or other internal space, which facilitates the arrangement of more battery cells or other functional components, optimizes the structural layout inside the battery device, and improves the space utilization of the battery device.

[0008] In some embodiments, the housing has a first side beam, which is spaced apart from the limiting beam along a second direction, which is perpendicular to the first direction; the busbar includes a straight section and a bent section connected to each other, and along the second direction, the end of the busbar closer to the battery cell is the straight section, and the other end of the busbar is the bent section; the projection of the bent section onto a projection plane perpendicular to the first direction falls completely within the projection of the limiting beam.

[0009] In the technical solution of this application embodiment, since the busbar includes a straight section and a bent section, and the projection of the bent section falls completely within the projection of the limiting beam, the projection range of the busbar can be precisely controlled, avoiding the bending section from obstructing the second accommodating space, further optimizing the disassembly path of the functional components, and facilitating the disassembly and assembly of the functional components during maintenance.

[0010] In some embodiments, the limiting beam has a protrusion at one end near the busbar along the first direction, the protrusion abutting against the battery cell; along the second direction, at least a portion of the protrusion is disposed between the bent section and the battery cell.

[0011] In the technical solution of this application embodiment, since a protrusion is provided at the end of the limiting beam near the busbar, sufficient bending space is provided for the bending section, enabling the busbar to achieve various preset bending angles and preventing the bending section from colliding with the limiting beam. In addition, the protrusion also abuts against the battery cell, providing bending space for the busbar while resisting the expansion force of the battery cell. Without adding additional components, the protrusion can balance the constraint of expansion and the optimization of spatial layout.

[0012] In some embodiments, the limiting beam has a first wall that abuts against the battery cell, and along the second direction, the thickness of the protrusion and the first wall are both in the range of 2mm-5mm.

[0013] In the technical solution of this application embodiment, since the wall thickness of the first wall and the protrusion is within a suitable range, the limiting beam has sufficient wall thickness, taking into account the structural strength, weight, and space occupation of the limiting beam, effectively resisting the expansion pressure of the battery cell, suppressing the bulging of the battery cell during the cycle, and improving the reliability of the battery device.

[0014] In some embodiments, along the first direction, the distance between the protrusion and the edge of the battery cell is in the range of 3mm-6mm, and / or the distance between the protrusion and the straight section is not less than 5mm.

[0015] In the technical solution of this application embodiment, sufficient electrical clearance and creepage distance are thus formed between the bus and the protrusion of the limiting beam in the first direction, preventing the distance between the two from being too small due to manufacturing errors or loose assembly, thereby avoiding potential insulation failure and short circuit risks and improving the electrical safety level of the system.

[0016] In some embodiments, the angle between the bent segment and the straight segment is between 90° and 135°, and / or, along the second direction, the size of the straight segment is between 1 and 2 times the size of the bent segment.

[0017] In the technical solution of this application embodiment, since the bending angle and size ratio are limited to a suitable range, the local stress concentration that may be caused by bending is avoided, the projected size of the bending section and the range of obstruction can be significantly reduced, and the current carrying capacity and space occupation of the busbar can be taken into account.

[0018] In some embodiments, the limiting beam and the box body together define the first accommodating space and the second accommodating space, the second accommodating space housing a functional component, the functional component including at least one of a heat exchange component and a conductive component.

[0019] In the technical solution of this application embodiment, the current collector avoids obstructing the disassembly and installation path of the functional components, providing more ample operating space for the functional components to be disassembled upwards or installed downwards along the first direction, and reducing the risk of interference between components during operation. While not sacrificing the current-carrying capacity of the current collector, interference during the maintenance of functional components is reduced, thus improving the maintenance efficiency of the battery device.

[0020] In some embodiments, the projection is made along a first direction onto a projection plane perpendicular to the first direction, and the distance between the projection of the busbar and the projection of the functional component is not less than 5 mm.

[0021] In the technical solution of this application embodiment, since the distance between the projection of the bending section and the projection of the functional component is not less than 5mm, sufficient clearance is reserved for the disassembly and installation of the functional component. This effectively prevents the risk of scratching or colliding between the bending section of the busbar and the functional component during disassembly, further reducing spatial interference between the functional component and the busbar, and facilitating smooth maintenance operations. Additionally, it can address processing and assembly errors of components, improving the fault tolerance rate of product manufacturing and assembly.

[0022] In some embodiments, the battery device includes a support beam disposed in the second accommodating space, the support beam being used to support the functional component, and the support beam being connected to the limiting beam and the housing, respectively.

[0023] In the technical solution of this application embodiment, since the support beam is set in the second accommodating space and is used to support the functional components, it can effectively support the functional components, making the installation of the functional components more secure and the layout more regular. It also provides a stable mounting carrier for the functional components, preventing them from shifting, wearing or falling off due to vibration, etc., and improving the stability of the functional components. In addition, the support beam can be welded and fixed to the limiting beam and the rear frame beam, enhancing the structural strength of the limiting beam and improving the overall structural stability of the battery device.

[0024] In some embodiments, the busbar connects two battery cells arranged along a third direction, which is perpendicular to the first direction and the second direction.

[0025] In the technical solution of this application embodiment, since the busbar connects two battery cells arranged along a third direction, the busbar can bridge different battery cells, making its layout adaptable to the battery cell array, and realizing effective electrical connection (series / parallel) between multiple battery cells or battery modules; in addition, the bridging path of the busbar along the third direction will not conflict with the first and second accommodating spaces, and will not affect the bending design of the busbar and the installation space of the functional components, which is conducive to improving the rationality of the overall layout of the battery device.

[0026] In some embodiments, the projection of the busbar onto a projection plane perpendicular to the second direction occurs along the second direction, and a portion of the projection of the busbar falls within the projection of the limiting beam.

[0027] In the technical solution of this application embodiment, the space occupied by the busbar in the second direction and its size in the second direction are further reduced, thereby further improving the space utilization of the battery device.

[0028] A second aspect of this application provides an electrical device, which in some embodiments includes the battery device described in the first aspect of this application, the battery device being used to store or provide electrical energy.

[0029] The beneficial effects of this disclosure include: by using this application, the busbar can avoid obstructing the disassembly and installation path of functional components, providing more ample operating space for the functional components to be disassembled upwards or installed downwards along the first direction, and reducing the risk of interference between components during operation. While not sacrificing the current-carrying capacity of the busbar, it reduces interference during the maintenance of functional components, optimizes the structural layout within the battery device, and improves the maintenance efficiency and space utilization of the battery device.

[0030] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0032] Figure 1 Structural schematic diagrams of vehicles provided for some embodiments of this application;

[0033] Figure 2 Schematic diagrams of the battery device provided for some embodiments of this application;

[0034] Figure 3 for Figure 2 A magnified view of a section at point B in the middle;

[0035] Figure 4 A schematic diagram of a limiting beam provided for some embodiments of this application;

[0036] Figure 5 for Figure 2 Sectional view at point AA.

[0037] Explanation of reference numerals in the attached figures

[0038] 100. Battery assembly; 101. Housing; 102. Frame; 103. Base plate; 104. First side beam; 1. Battery cell; 10. Battery cell assembly; 20. Busbar; 21. Straight section; 22. Bending section; 30. Limiting beam; 31. Protrusion; 32. First wall; 40. Functional component; 41. Heat exchange component; 42. Conductive component; 50. Support beam; 200. Controller; 300. Motor; 1000. Vehicle; S1. First accommodating space; S2. Second accommodating space. Detailed Implementation

[0039] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in this document and the foregoing description of the accompanying drawings are intended to cover non-exclusive inclusion.

[0041] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0042] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0044] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0045] In the description of the embodiments of this application, unless otherwise expressly 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0046] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0047] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "parallel" and "perpendicular" are both allowed to have a certain degree of tolerance and / or error, including cases of being approximately parallel and approximately perpendicular.

[0048] The following is a detailed description of this application.

[0049] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0050] Within battery packs, the large size of the bridging busbars, when placed above the limiting beams, can easily obstruct the areas where functional components are located, causing interference with the installation and removal of these components. Therefore, optimizing the internal spatial layout of battery packs is one of the research topics in the industry.

[0051] Through research and design, a portion of the bridging busbar is bent towards the side where the limiting beam is located, and a protrusion is provided on the top of the limiting beam to provide ample bending space and facilitate bending of the busbar. This prevents the busbar from interfering with the installation and removal of functional components.

[0052] Based on this design concept, this application designs a battery device, including a housing, battery cells, a busbar and a limiting beam. The housing accommodates the limiting beam, and the limiting beam and the housing together define a first accommodating space, which contains multiple battery cells. The busbar is electrically connected to the battery cells and projects along a first direction onto a projection plane perpendicular to the first direction. Part of the projection of the busbar overlaps with the projection of the limiting beam. The first direction is the height direction of the battery cells. Along the first direction, a portion of the busbar bends toward the side where the limiting beam is located.

[0053] Since the projection of the busbar along the first direction partially overlaps with the projection of the limiting beam, and a portion of the busbar bends toward the side where the limiting beam is located, the size of the busbar in the perpendicular direction is reduced to a certain extent. This reduces the space occupied by the busbar in the first accommodating space or other internal space, making it easier to arrange more battery cells or other functional components, optimizing the structural layout within the battery device, and improving the space utilization of the battery device.

[0054] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this application. The description is as follows with reference to the accompanying drawings.

[0055] Figure 1The diagram illustrates the structure of a vehicle 1000 as provided in some embodiments of this application. The vehicle 1000 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. Figure 1 As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0056] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0057] In the embodiments of this application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0058] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0059] Although not illustrated, a single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0060] In some embodiments, the electrode assembly has tabs (not shown) that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0061] In some embodiments, the electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0062] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0063] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0064] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, it serves to protect the electrode assembly, and a sealing bag is included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0065] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to an internal tab. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collector. The electrode terminal can be provided on an end cap or on the housing.

[0066] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0067] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0068] 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.

[0069] 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.

[0070] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0071] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] The technical solutions described in the embodiments of this application 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.

[0077] Below, refer to Figures 2 to 5 Some embodiments of this application will be described in detail.

[0078] Figure 2 Schematic diagrams of the battery device provided for some embodiments of this application; Figure 3 for Figure 2 A magnified view of a section at point B in the middle; Figure 4 A schematic diagram of a limiting beam provided for some embodiments of this application; Figure 5 for Figure 2 Sectional view at point AA.

[0079] In some embodiments of this application, for ease of explanation, a first direction, a second direction, and a third direction are defined. These directions intersect each other; here, intersecting each other includes perpendicularly intersecting each other. For ease of understanding of the embodiments of this application, Figures 2 to 3 are provided. Figure 5In the illustrated embodiments, the first direction, the second direction, and the third direction are given as examples where they intersect each other perpendicularly. However, those skilled in the art should understand that the embodiments of this application are not limited to the case where these three directions intersect each other perpendicularly. For ease of explanation, as follows... Figure 2 to Figure 5 As shown by the arrows, the direction of arrow Y is the third direction, the direction of arrow X is the second direction, and the direction of arrow Z is the first direction. Sometimes, the direction that arrow Z points in along the first direction is called "above," and its opposite direction is called "below."

[0080] The first aspect of this application provides a battery device 100. In the embodiments of this application, the battery device 100 includes a housing 101, a battery cell 1, a busbar 20, and a limiting beam 30. The housing 101 accommodates the limiting beam 30, and the limiting beam 30 and the housing 101 together define a first accommodating space S1. The first accommodating space S1 accommodates a plurality of battery cells 1. The busbar 20 is electrically connected to the battery cell 1 and is projected along a first direction onto a projection plane perpendicular to the first direction. A portion of the projection of the busbar 20 overlaps with the projection of the limiting beam 30. The first direction is the height direction of the battery cell 1. Along the first direction, a portion of the busbar 20 bends toward the side where the limiting beam 30 is located.

[0081] It is understood that the battery device 100 may be a battery pack, including a housing 101 and a plurality of battery cells 1 within the housing 101.

[0082] Optionally, the box 101 can adopt various structures. Optionally, the box 101 can be a hollow structure with one side open, and the lid closes to the open side to form a box 101 with a placement space. Also optionally, the box 101 can be constructed as a closed box 101.

[0083] Optionally, the housing 101 includes at least a frame 102 and a base plate 103. The frame 102 is arranged around the edge of the base plate 103, and the frame 102 and the limiting beam 30 define a first accommodating space S1 and a second accommodating space S2.

[0084] By way of example, in some other embodiments not shown, the housing 101 may also include a housing 101 cover, and the cover and bottom plate 103 are respectively connected to the frame 102, so that the interior of the housing 101 forms a closed space to accommodate the battery cell 1.

[0085] Understandably, the material of the frame 102 should possess sufficient strength, rigidity, and corrosion resistance to provide support and protection within the battery device 100 while minimizing weight to improve energy efficiency. Optionally, the frame 102 may be made of materials such as aluminum alloy, high-strength steel, or composite materials.

[0086] Optionally, the frame 102 can be a straight frame structure extending along a straight line, or it can be a curved frame structure.

[0087] Alternatively, the frame 102 can be formed by die casting, roll forming, extrusion forming or cutting from profiles.

[0088] Optionally, the shape of the border 102 may include, but is not limited to, a rectangular structure, a circular structure, a triangular structure, a pentagonal structure, a hexagonal structure, a rhombus structure, or an elliptical structure. Accordingly, the shape of the accommodating space matches the shape of the border 102.

[0089] For example, such as Figure 2 As shown, the frame 102 may include multiple side beams, which are connected end to end to form a rectangular frame structure. The connection and fixing methods between adjacent side beams include, but are not limited to, screw connection, riveting, welding, bonding or snap-fit.

[0090] Optionally, a transition connector may be provided between two adjacent side beams along the circumference of the frame 102, and the transition connector is welded and fixed to at least part of the frame components.

[0091] Understandably, the limiting beam 30 is a rigid support and constraint structure set inside the box 101, usually made of metal profiles (such as steel beams or aluminum profiles) or high-strength composite materials.

[0092] For example, the limiting beam 30 is disposed inside the box body 101, and the limiting beam 30 is welded and fixed to the frame 102 and / or the bottom plate 103.

[0093] For example, the limiting beam 30 can be arranged parallel to the side beam. Figure 2 As shown, the limiting beam 30 is arranged parallel to the first side beam 104.

[0094] For example, both ends of the limiting beam 30 may extend along a third direction (Y) to the frame 102 and be welded to the frame 102.

[0095] Understandably, the busbar 20 is a conductive connector, usually made of highly conductive metal (such as copper, aluminum or copper-aluminum composite material), which enables electrical connection between multiple battery cells 1 to achieve current collection and transmission.

[0096] It is understandable that the busbar 20 can be located on the shoulder of the battery cell 1 and electrically connected to the electrode terminals of the battery cell 1.

[0097] For example, the electrode terminals are disposed on one side (top) of the battery cell 1 along the height direction (Z).

[0098] It is understandable that if the busbar 20 is large, its end may extend into the second receiving space S2 and interfere with the disassembly and installation of the functional component 40, for example, by colliding with the functional component 40, which is not conducive to maintenance.

[0099] For example, multiple battery cells 1 can be connected in series or parallel to form a battery cell assembly 10 or a module.

[0100] It is understandable that the battery cell 1 near the limiting beam 30 can abut against the limiting beam 30.

[0101] For example, the battery cell 1 near the limiting beam 30 can be connected via the busbar 20.

[0102] For example, the busbar 20 is a jumper bar that connects two battery cell assemblies 10 or modules. The busbar 20 has a large size due to the requirement of flow area, for example, it can extend above the limiting beam 30 in the second direction (X).

[0103] It is understandable that, compared to a flat panel perpendicular to the first direction (Z), a portion of the busbar 20 bends toward the side where the limiting beam 30 is located, that is, a portion of the busbar 20 bends downward, which can reduce the projected area of ​​the busbar 20 along the first direction (Z) and reduce the size it occupies along the second direction (X), thereby preventing it from interfering with the arrangement of the functional components 40 or the battery cells 1.

[0104] For example, such as Figure 5 As shown, a portion of the busbar 20 (i.e., the bent section 22) is closer to the limiting beam 30 than the other portions.

[0105] In the technical solution of this application embodiment, since the projection of the busbar 20 along the first direction overlaps with the projection of the limiting beam 30, and a part of the busbar 20 bends toward the side where the limiting beam 30 is located, the size of the busbar 20 in the perpendicular direction is reduced to a certain extent, the busbar 20 occupies space in the first accommodating space S1 or other box 101, which facilitates the arrangement of more battery cells 1 or other functional components 40, optimizes the structural layout inside the battery device 100, and improves the space utilization of the battery device 100.

[0106] In the embodiments of this application, the housing 101 has a first side beam 104, the first side beam 104 and the limiting beam 30 are spaced apart along the second direction (X), the second direction (X) is perpendicular to the first direction (Z); the busbar 20 includes a straight section 21 and a bent section 22 connected to each other, along the second direction (X), the end of the busbar 20 near the battery cell 1 is the straight section 21, and the other end of the busbar 20 is the bent section 22; the projection of the bent section 22 onto the projection plane perpendicular to the first direction (Z) is completely within the projection of the limiting beam 30.

[0107] It is understandable that the first side beam 104 is part of the frame 102.

[0108] For example, in the rectangular border 102, the first side beam 104 is a straight side beam, which is parallel to the limiting beam 30 and is spaced apart, defining a second accommodating space S2 between them.

[0109] It should be noted that the busbar 20 includes a straight section 21 and a bent section 22 that are connected to each other. Both the straight section 21 and the bent section 22 are made of conductive metal materials, such as copper or aluminum. The connection between the two includes both physical connection and conductive connection.

[0110] Understandably, the straight section 21 is the part of the busbar 20 that is not bent and basically maintains its original planar or straight state, and is used for welding to the electrode terminals.

[0111] Understandably, the bending section 22 is the part of the busbar 20 that is bent to achieve space avoidance.

[0112] Optionally, the shape of the bending segment 22 can be an arc segment, a right-angle segment, or a bend at other angles.

[0113] It should be noted that the bridging busbar 20 in the related technology has a large requirement for flow area and a large dimension along the second direction (X). This solution utilizes the bending section 22 to reduce the projected area after bending, so as to minimize its dimension along the second direction (X) and prevent the busbar 20 from interfering with the installation and removal of the functional component 40 or occupying or blocking the channel space.

[0114] It is understandable that the straight section 21 and the bent section 22 can be fixed by welding or other means, or the busbar 20 can be formed by stamping or other methods to form such a straight section 21 and bent section 22.

[0115] In the technical solution of this application embodiment, since the busbar 20 includes a straight section 21 and a bent section 22, and the projection of the bent section 22 falls completely within the projection of the limiting beam 30, the projection range of the busbar 20 can be precisely controlled, avoiding the bending section 22 from blocking the second accommodating space S2, further optimizing the disassembly path of the functional component 40, and facilitating the disassembly and assembly of the functional component 40 during maintenance.

[0116] In the embodiments of this application, the limiting beam 30 has a protrusion 31 at one end near the busbar 20 along the first direction (Z), and the protrusion 31 abuts against the battery cell 1; along the second direction (X), at least a portion of the protrusion 31 is disposed between the bent section 22 and the battery cell 1.

[0117] It is understandable that the protrusion 31 is a raised structure that extends upward from the top of the main body of the limiting beam 30.

[0118] Understandably, the structure of the protrusion 31 allows the bending section 22 to avoid the top plane that the limiting beam 30 might have originally had.

[0119] Alternatively, the protrusion 31 can be block-shaped, strip-shaped, or rib-shaped.

[0120] Optionally, the protrusion 31 may extend in a third direction (Y), and the limiting beam 30 may have one or more protrusions 31.

[0121] For example, when there is only one protrusion 31, its length along the third direction (Y) can be the same as or less than the length of the limiting beam 30.

[0122] Alternatively, in an embodiment not shown, the two ends of the protrusion 31 along a third direction (Y) may be welded to the frame 102.

[0123] Optionally, the limiting beam 30 may have multiple protrusions 31, which may have the same or different lengths, and the multiple protrusions 31 may be spaced apart along a third direction (Y). This application embodiment does not limit this.

[0124] Alternatively, the protrusion 31 can be integrally formed with the limiting beam 30 (e.g., formed directly during extrusion molding), or it can be attached by welding, riveting, or other methods.

[0125] It is understood that the abutment protrusion 31 contacts the battery cell 1 and can transmit pressure. This contact can be direct or indirect, such as with a buffer pad (like foam) in between. This application does not limit this aspect.

[0126] Understandably, the protrusion 31 is located on the side near the manifold 20, that is, at the top of the limiting beam 30.

[0127] Understandably, the protrusion 31 is also provided with a limiting beam 30 at one end along the second direction (X) near the battery cell 1, so as to facilitate contact with the battery cell 1.

[0128] It should be noted that, as Figure 3 , Figure 5 As shown, the protrusion 31 is located between the bending segment 22 and the battery cell 1 in the second direction (X). The protrusion 31 physically separates the bending segment 22 and the battery cell 1, providing the necessary longitudinal space for the bending segment 22 to bend downwards, while also constraining the expansion of the battery cell 1.

[0129] For example, the protrusion 31 and the bent segment 22 are spaced apart in the second direction (X), i.e., there is an air gap between them to prevent short circuit.

[0130] In the technical solution of this application embodiment, since the limiting beam 30 has a protrusion 31 at one end near the busbar 20, it provides sufficient bending space for the bending section 22, enabling the busbar 20 to achieve various preset bending angles and preventing the bending section 22 from colliding with the limiting beam 30. In addition, the protrusion 31 also abuts against the battery cell 1, providing bending space for the busbar 20 while also resisting the expansion force of the battery cell 1. Without adding additional components, the protrusion 31 can balance the constraint of expansion and the optimization of spatial layout.

[0131] In the embodiments of this application, the limiting beam 30 has a first wall 32, which abuts against the battery cell 1. Along the second direction (X), the thickness of both the protrusion 31 and the first wall 32 is in the range of 2mm-5mm.

[0132] Understandably, the first wall 32 is located on the side of the limiting beam 30 closest to the battery cell 1, and is the main load-bearing surface that bears the expansion force of the battery.

[0133] For example, such as Figure 4 As shown, the limiting beam 30 has a cavity inside and two walls along the second direction (X), with the wall closer to the battery cell 1 being the first wall 32.

[0134] Optionally, the thickness of the protrusion 31 and the first wall 32 can be the same or different.

[0135] Alternatively, the wall thickness of the protrusion 31 can be the same or different at different locations; for example, the top of the protrusion 31 can be thinner than the bottom.

[0136] Optionally, the portion of the protrusion 31 that contacts the first wall 32 has the same wall thickness. This ensures a smooth transition and prevents stress concentration.

[0137] Optionally, the wall thickness can be any one of the following values, or any combination thereof: 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm.

[0138] In the technical solution of this application embodiment, since the wall thickness of the first wall 32 and the protrusion 31 is within a suitable range, the limiting beam 30 can have sufficient wall thickness, taking into account the structural strength, weight and space occupation of the limiting beam 30, effectively resisting the expansion pressure of the battery cell 1, suppressing the bulging of the battery cell 1 during the cycle, and improving the reliability of the battery device 100.

[0139] In the embodiments of this application, along the first direction (Z), the distance between the protrusion 31 and the edge of the battery cell 1 is in the range of 3mm-6mm, and / or, the distance between the protrusion 31 and the straight section 21 is not less than 5mm.

[0140] Optionally, the distance between the protrusion 31 and the edge of the battery cell 1 can be any one of the following values, or any combination of these values: 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6mm.

[0141] Optionally, the distance between the protrusion 31 and the straight section 21 is not less than 5mm, such as 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc. Other values ​​are not listed.

[0142] In the technical solution of this application embodiment, sufficient electrical clearance and creepage distance are formed between the bus 20 and the protrusion 31 of the limiting beam 30 in the first direction (Z), preventing the distance between the two from being too small due to manufacturing errors or loose assembly, thereby avoiding potential insulation failure and short circuit risks and improving the electrical safety level of the system.

[0143] In embodiments of this application, the angle between the bent segment 22 and the straight segment 21 is between 90° and 135°, and / or, along the second direction (X), the size of the straight segment 21 is between 1 and 2 times the size of the bent segment 22.

[0144] It is understandable that the plane containing the bending section 22 forms a right angle or an obtuse angle with the plane containing the straight section 21, which facilitates bending and can prevent excessive bending from causing the busbar 20 to break.

[0145] Optionally, the angle between the bent section 22 and the straight section 21 can be any one of the following values, or any value between any two of these values: 90°, 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 135°.

[0146] Optionally, the size of the straight section 21 can be larger than the size of the bent section 22, or it can be equal to the size of the bent section 22.

[0147] In the technical solution of this application embodiment, since the bending angle and size ratio are limited to a suitable range, the local stress concentration that may be caused by bending is avoided, the projected size of the bending segment 22 and the range of obstruction can be significantly reduced, and the current carrying capacity and space occupation of the busbar 20 can be taken into account.

[0148] In the embodiments of this application, the battery device 100 includes a support beam 50, which is disposed in the second accommodating space S2. The support beam 50 is used to support the functional component 40 and is connected to the limiting beam 30 and the housing 101 respectively.

[0149] It is understandable that the support beam 50 is an additional beam added to the second accommodating space S2, and the support beam 50 can be a metal beam.

[0150] For example, such as Figure 2 , Figure 3 As shown, the support beam 50 extends along the third direction (Y), and the two ends of the support beam 50 along the second direction (X) are connected to the limiting beam 30 and the first side beam 104 respectively to form a reinforced structure to prevent the limiting beam 30 from deforming too much and causing the weld structure to fail.

[0151] For example, the support beam 50 is fixed by welding to the limiting beam 30 and the first side beam 104 respectively.

[0152] Understandably, the support beam 50 is placed below the functional component 40, and the functional component 40 can be mounted on top of the support beam 50.

[0153] For example, such as Figure 2 , Figure 3 , Figure 5 As shown, the functional component 40 includes a heat exchange component 41, and a support beam 50 is placed below the heat exchange component 41. The water cooling pipe of the heat exchange component 41 can be installed on the support beam 50 by fixing pipe clamps.

[0154] It should be noted that the shape of the support beam 50 is not limited to that shown in the figure, and those skilled in the art can set it according to actual needs.

[0155] In the technical solution of this application embodiment, since the support beam 50 is disposed in the second accommodating space S2 and is used to support the functional component 40, it can effectively support the functional component 40, making the installation of the functional component 40 more secure and the layout more regular, and providing a stable mounting carrier for the functional component 40, preventing it from shifting, wearing or falling off due to vibration, etc., and improving the stability of the functional component 40; in addition, the support beam 50 can be welded and fixed to the limiting beam 30 and the rear frame beam 102, enhancing the structural strength of the limiting beam 30 and improving the overall structural stability of the battery device 100.

[0156] In the embodiments of this application, the limiting beam 30 and the box body 101 together define a first accommodating space S1 and a second accommodating space S2. The second accommodating space S2 houses a functional component 40, which includes at least one of a heat exchange component 41 and a conductive component 42.

[0157] Understandably, the limiting beam 30 divides the interior of the box 101 into two storage spaces, where the first storage space S1 houses multiple battery cells 1 and the second storage space S2 houses functional components 40.

[0158] It is understood that the embodiments of this application do not limit the size and shape of the first accommodating space S1 and the second accommodating space S2, and can be determined according to the shape and position of the box 101 and the limiting beam 30.

[0159] It is understood that the functional component 40 may include one or more functional components of the battery device 100, such as the heat exchange component 41, the conductive component 42, and the sampling component.

[0160] For example, functional component 40 may include heat exchange tube, heat exchange tube connector, high and low voltage wiring harness, sampling wiring harness, sampling circuit board, fireproof foam, etc., and the embodiments of this application do not limit this.

[0161] It should be noted that when maintaining functional component 40, it may be necessary to remove it for replacement or repair. Specifically, after disassembly, it needs to be removed from the second receiving space S2, with the general direction of movement being upward along the first direction (Z). During installation, functional component 40 needs to be moved downward to be inserted.

[0162] For example, the heat exchange assembly 41 may include water-cooled pipes, pipe clamps, pipe joints and other structures.

[0163] For example, the conductive component 42 may include components such as high-voltage and low-voltage wiring harnesses, relays, fuses, and connectors.

[0164] In the technical solution of this application embodiment, the busbar 20 is thus prevented from obstructing the disassembly and installation path of the functional component 40, providing more ample operating space for the functional component 40 to be disassembled upwards or installed downwards along the first direction, reducing the risk of interference between components during operation. While maintaining the current-carrying capacity of the busbar 20, interference during maintenance of the functional component 40 is reduced, improving the maintenance efficiency of the battery device 100. Since the functional component 40 includes at least one of the heat exchange component 41 and the conductive component 42, the application range of the busbar 20 is expanded, improving the adaptability of the overall spatial layout scheme, facilitating the matching of corresponding functional components 40 according to the needs of different battery devices 100, and enhancing the versatility of the solution.

[0165] In the embodiments of this application, the projection is directed along the first direction (Z) to a projection plane perpendicular to the first direction (Z), and the distance between the projection of the busbar 20 and the projection of the functional component 40 is not less than 5mm.

[0166] It is understandable that the minimum distance between the projected shapes of the two is no less than 5mm.

[0167] For example, the bend segment 22 of the busbar 20 is closest to the functional component 40.

[0168] Optionally, the distance between the projection of the bending segment 22 and the projection of the functional component 40 is not less than 5mm, such as 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc. Other values ​​are not listed.

[0169] In the technical solution of this application embodiment, since the distance between the projection of the bent section 22 and the projection of the functional component 40 is not less than 5mm, sufficient clearance is reserved for the disassembly and installation of the functional component 40. This effectively prevents the risk of scratching or colliding between the bent section 22 of the busbar 20 and the functional component 40 during disassembly, further reducing spatial interference between the functional component 40 and the busbar 20, and facilitating smooth maintenance operations. Additionally, it can address component processing and assembly errors, improving the fault tolerance rate of product manufacturing and assembly.

[0170] In the embodiments of this application, the busbar 20 connects two battery cells 1 arranged along a third direction (Y), which is perpendicular to the first direction (Z) and the second direction (X).

[0171] It is understandable that the third direction (Y) is the extension direction of the limiting beam 30, that is, the battery cells 1 arranged along the third direction (Y) all abut against the limiting beam 30.

[0172] For example, multiple busbars 20 are arranged along the second direction (X) to form a battery cell assembly 10, and the battery cell 1 closest to the limiting beam 30 in the two battery cell assemblies 10 is connected by the busbars 20 of this embodiment.

[0173] For example, the busbar 20 is a crossbar extending along a third direction (Y) to connect two adjacent battery cell assemblies 10 along the third direction (Y).

[0174] For example, the battery cell 1 has two electrode terminals arranged along a third direction (Y), and the busbar 20 connects the electrode terminals of adjacent battery cells 1 that are furthest apart.

[0175] In the technical solution of this application embodiment, since the busbar 20 connects two battery cells 1 arranged along the third direction (Y), the busbar 20 can bridge different battery cells 1, making its layout adaptable to the battery cell 1 array, and realizing effective electrical connection (series / parallel connection) between multiple battery cells 1 or battery modules; in addition, the bridging path of the busbar 20 along the third direction (Y) will not conflict with the first accommodating space S1 and the second accommodating space S2, and will not affect the bending design of the busbar 20 and the installation space of the functional component 40, which is conducive to improving the rationality of the overall layout of the battery device 100.

[0176] In the embodiments of this application, the projection of the busbar 20 is directed along the second direction onto a projection plane perpendicular to the second direction, and a portion of the projection of the busbar 20 falls within the projection of the limiting beam 30.

[0177] For example, the limiting beam 30 has a protrusion 31, and a portion of the projection of the busbar 20 falls within the projection of the protrusion 31.

[0178] In the technical solution of this application embodiment, the space occupied by the busbar 20 in the second direction and its size in the second direction are further reduced, thereby further improving the space utilization of the battery device 100.

[0179] The second aspect of this application provides an electrical device, which includes a battery device 100 from the first aspect of this application. The battery device 100 is used to store or provide electrical energy.

[0180] For example, the electrical device may be vehicle 1000, such as Figure 1As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0181] The specific solutions of the embodiments of this application are described below with reference to the accompanying drawings.

[0182] The problem this solution addresses is that the busbar 20 inside the housing 101 can easily obstruct the side where the functional component 40 is located. When the functional component 40 is disassembled and maintained, it is easily interfered with by the busbar 20. There is insufficient space above the functional component 40, which makes it impossible for maintenance personnel to disassemble it smoothly and remove it from the housing 101 upwards (along the Z direction).

[0183] This design includes a busbar 20 (bridging plate) and a limiting beam 30, both of which are installed inside the housing 101 of the battery device 100 (battery pack). One side of the limiting beam 30 abuts against the battery cell 1 (cell), while the other side is provided with a functional component 40 in the gap between it and the housing 101. The functional component 40 can be a water cooling pipe, wiring harness, etc.

[0184] In a specific embodiment, the upper end of the limiting beam 30 has an upward protrusion 31, which is fixed to the limiting beam 30 and abuts against the battery cell 1 to resist the expansion of the battery cell 1.

[0185] In a specific embodiment, the busbar 20 spans two different battery cells 1. The busbar 20 includes a straight section 21 and a bent section 22. The straight section 21 is close to the battery cell 1, parallel to the top cover of the battery cell 1, and is located in the space above the limiting beam 30. The bent section 22 is also located in the space above the limiting beam 30, bending downwards and placed flat relative to the busbar 20. This reduces the projection of the busbar 20 along the height direction (i.e., the vertical direction, also known as the Z-direction) of the battery cell 1, thereby reducing the obstruction of the second accommodating space S2 and reducing interference with the loading and unloading of the functional components 40 located in the second accommodating space S2. If the top of the limiting beam 30 is flat (perpendicular to the height direction of the battery cell 1), the busbar 20 will be difficult to bend. Therefore, in this solution, the top of the limiting beam 30 is changed to a protrusion 31, allowing the bent section 22 to bend. After bending, it is close to the protrusion 31, reducing the obstruction of the bent section 22 on the second accommodating space S2 and the functional components 40.

[0186] In another specific embodiment, the wall thickness of the limiting beam 30 (i.e., the first wall 32) near the battery cell 1 is 2-5mm to resist the expansion and deformation of the battery cell 1.

[0187] In a specific embodiment, the height of the top of the limiting beam 30 from the shoulder height of the battery cell 1 can be selected in the range of 3-6mm, and the gap between it and the upper busbar 20 is ≥5mm. If this is not met, foam protection can be added.

[0188] In a specific embodiment, the angle of the bending section 22 can be adjusted appropriately according to the spacing between the limiting beam 30 and the rear frame 102 beam. The range of the bending angle with the straight section 21 is 90-135°, and the ratio of the straight section 21 to the bending section 22 of the busbar 20 is 2:1-1:1.

[0189] In a specific embodiment, the Z-direction projection distance of the manifold 20 from the water-cooling pipe projection is ≥5mm, which is beneficial for the disassembly of the water-cooling pipe.

[0190] In a specific embodiment, to prevent excessive deformation of the limiting beam 30 from causing weld structure failure, a support beam 50 structure can be added between the limiting beam 30 and the rear frame beam 102. The support beam 50 is placed below the water cooling pipe, and the water cooling pipe fixing clamp can be installed on the support beam 50. The support beam 50 is fixed by welding with the limiting beam 30 and the rear frame beam 102.

[0191] In a specific embodiment, the first wall 32 of the limiting beam 30 is integrally extruded with the protrusion 31, reducing the cavity and weight. After extrusion, the limiting beam 30 structure can be locally machined to avoid interference according to the design envelope requirements of the battery device 100.

[0192] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0193] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0194] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of protection claimed in this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of protection claimed.

Claims

1. A battery device, characterized in that, The device includes a housing, battery cells, a busbar, and a limiting beam. The housing contains the limiting beam, and the limiting beam and the housing together define a first accommodating space, which contains multiple battery cells. The busbar is electrically connected to the battery cells and projects along a first direction onto a projection plane perpendicular to the first direction. A portion of the projection of the busbar overlaps with the projection of the limiting beam. The first direction is the height direction of the battery cells. Along the first direction, a portion of the busbar bends toward the side where the limiting beam is located.

2. The battery device according to claim 1, characterized in that, The housing has a first side beam, which is spaced apart from the limiting beam along a second direction, which is perpendicular to the first direction. The busbar includes a straight section and a bent section connected to each other. Along the second direction, the straight section is located at one end of the busbar closer to the battery cell, and the bent section is located at the other end of the busbar. The projected projection of the bent section onto a projection plane perpendicular to the first direction falls completely within the projection of the limiting beam.

3. The battery device according to claim 2, characterized in that, The limiting beam has a protrusion at one end near the busbar along the first direction, and the protrusion abuts against the battery cell; along the second direction, at least a portion of the protrusion is disposed between the bent section and the battery cell.

4. The battery device according to claim 3, characterized in that, The limiting beam has a first wall that abuts against the battery cell. Along the second direction, the thickness of the protrusion and the first wall are both in the range of 2mm-5mm.

5. The battery device according to claim 3, characterized in that, Along the first direction, the distance between the protrusion and the edge of the battery cell is in the range of 3mm-6mm, and / or the distance between the protrusion and the straight section is not less than 5mm.

6. The battery device according to claim 2, characterized in that, The angle between the bent section and the straight section is between 90° and 135°, and / or, along the second direction, the size of the straight section is between 1 and 2 times the size of the bent section.

7. The battery device according to any one of claims 1 to 6, characterized in that, The limiting beam and the box together define the first accommodating space and the second accommodating space. The second accommodating space houses functional components, including at least one of heat exchange components and conductive components.

8. The battery device according to claim 7, characterized in that, The battery device includes a support beam disposed in the second accommodating space. The support beam is used to support the functional components and is connected to the limiting beam and the housing, respectively.

9. The battery device according to claim 7, characterized in that, The distance between the projection of the busbar and the projection of the functional component is not less than 5mm.

10. The battery device according to any one of claims 2 to 6, characterized in that, The busbar connects two battery cells arranged along a third direction, which is perpendicular to the first direction and the second direction.

11. The battery device according to any one of claims 2 to 6, characterized in that, The portion of the projection of the busbar falls within the projection of the limiting beam when projected along the second direction onto a projection plane perpendicular to the second direction.

12. An electrical appliance, characterized in that, The battery device includes any one of claims 1 to 11, the battery device being used to store or provide electrical energy.

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