Battery device, power utilization device and connecting piece

Abstract

The utility model provides a battery device, a power utilization device and a connecting piece. The battery device comprises a plate assembly, a mounting structure, a battery monomer and the connecting piece, the plate assembly is provided with a through fixing through hole. At least part of the mounting structure is located on the side, in the penetrating direction of the fixing through hole, of the fixing through hole, and at least part of the mounting structure and the plate assembly jointly define a mounting space. And at least part of the battery monomers are positioned in the mounting space. The connecting piece comprises a first face and a second face, a part of the connecting piece penetrates through the fixing through hole so that the first face and the installation structure can be fixed in a friction welding mode, a part of the plate assembly is located between the installation structure and the second face, and the second face and the plate assembly are fixed in a friction welding mode. According to the battery device provided by the embodiment of the invention, fixing structures such as threads do not need to be prepared on the mounting structure and the connecting piece in advance, and the structures of the mounting structure and the connecting piece do not need to be damaged in the mounting process, so that stress concentration is reduced.

Description

Technical Field

[0001] This application relates to battery technology, and more particularly to a battery device, an electrical device, and a connector. Background Technology

[0002] In related technologies, the plate assembly and mounting structure are fixed by means of bolts and sealing gaskets, so that the plate assembly and mounting structure become part of the battery device's housing assembly and achieve sealing with the outside world.

[0003] Bolted connections involve multiple assembly steps, including the use of bolts and sealing washers. Furthermore, during bolt tightening, stress concentration can easily occur in localized areas of the connection, leading to damage to the sealing area and the sealing washers. Utility Model Content

[0004] This application provides a battery device, an electrical device, and a connector, which helps to simplify the manufacturing and assembly process of the battery device.

[0005] The technical solution of this application embodiment is implemented as follows:

[0006] This application provides a battery device, including:

[0007] The plate assembly has a through-hole for fixing;

[0008] The mounting structure is at least partially located on one side of the fixing through hole along the through direction of the fixing through hole, and at least part of the mounting structure together with the plate assembly forms a mounting space;

[0009] The battery cell is at least partially located within the mounting space;

[0010] A connector includes a first surface and a second surface. A portion of the connector passes through the fixing through hole to allow the first surface to be friction-welded to the mounting structure. A portion of the plate assembly is located between the mounting structure and the second surface, and the second surface is friction-welded to the plate assembly.

[0011] In this embodiment of the battery device, the first surface of the connector is friction-welded to the mounting structure, allowing the second surface of the connector to work with the mounting structure to restrict the relative position of the board assembly and the mounting structure. The connector is fixed to the mounting structure via friction welding, eliminating the need for pre-fabricating threads or other fixing structures on the mounting structure and connector, and avoiding any damage to the structure of the mounting structure and connector during installation. The surface contact between the connector and the mounting structure helps reduce stress concentration. Friction welding can be performed immediately after the connector is inserted into the fixing through hole, simplifying the operation and improving production efficiency. This allows the connector to directly connect the board assembly and the mounting structure, thereby better controlling the relative position of the board assembly and the mounting structure and improving the stability of the connection.

[0012] In some embodiments, the outer surface of the plate assembly facing away from the mounting structure includes a first contact surface, which is a continuous surface, and at least a portion of the second surface is friction-welded to the first contact surface. This simplifies the manufacturing process of the first contact surface and also facilitates increasing the contact area between the first contact surface and the connector during the friction welding process, increasing the size of the second surface, and improving the connection strength.

[0013] In some embodiments, at least a portion of the second surface surrounds the periphery of the opening on the side of the mounting hole facing away from the mounting structure. Thus, the welding area between the connector and the board assembly seals the external space of the mounting hole and the board assembly, reducing the risk of foreign objects entering the mounting space through the mounting hole and damaging the battery cells. This eliminates the need for additional sealing components and helps reduce the number of components in the battery device.

[0014] In some embodiments, the outer surface of the mounting structure near the plate assembly includes a second contact surface, which is a continuous surface. The first surface and the second contact surface are fixed together by friction welding. This simplifies the manufacturing process of the second contact surface and also facilitates increasing the contact area between the second contact surface and the connector during friction welding, thereby increasing the size of the first surface and improving the connection strength.

[0015] In some embodiments, the plate assembly includes multiple plate structures stacked on top of each other. Each plate structure has through-holes that penetrate the plate structure, and these through-holes are interconnected along the stacking direction to form the fixing through-holes. In this way, multiple plate structures can be fixed using connectors, which helps reduce the number of parts and simplifies the process of connecting and fixing the plate assembly to the mounting structure.

[0016] In some embodiments, multiple plate structures include a thermal management component and a protective plate, with at least a portion of the thermal management component located between the mounting structure and the protective plate, and at least a portion of the second surface located on the side of the protective plate opposite to the thermal management component. Thus, the connector can fix the position of the thermal management component and the protective plate relative to the mounting structure by friction welding, reducing the risk of damage to the thermal management component during the friction welding process.

[0017] In some embodiments, the mounting structure includes multiple box-shaped side beams, which are joined end-to-end to form a mounting cavity. One side of the mounting cavity is open, and the plate assembly is placed over the open portion of the mounting cavity to form the mounting space. In this way, the box-shaped side beams themselves have high structural strength, and the plate assembly is fixed to the box-shaped side beams via connectors, which helps to improve the structural strength of the plate assembly.

[0018] This application also provides an electrical device, which includes a battery device as described in any of the foregoing embodiments, the battery device serving as a power source for the electrical device. Thus, by employing the battery device from the foregoing embodiments, the overall manufacturing cost of the electrical device is reduced, and the overall manufacturing process is simplified.

[0019] This application embodiment also provides a connector for any of the battery devices described in the foregoing embodiments, the connector comprising:

[0020] The connecting part includes a connecting body and a first protrusion. The connecting body extends along a first direction and the first protrusion is provided on the end face along the first direction. The first protrusion protrudes from the connecting body along the first direction and is used for friction welding with the mounting structure to form a first surface.

[0021] A flange portion is located on one side of the connecting body along a second direction, where the first direction intersects the second direction. The side surface of the flange portion along the first direction near the first protrusion is used to form a second surface.

[0022] Thus, by setting the first protrusion to form the first surface, it is beneficial to concentrate the heat of friction on the first protrusion during the friction welding process, so that the first protrusion can melt more quickly to form the first surface, which is beneficial to improving manufacturing efficiency.

[0023] In some embodiments, the projection of the first protrusion along the first direction is annular in a projection plane perpendicular to the first direction. This facilitates the more even distribution of the molten material from the first protrusion along the rotational trajectory during the rotational friction welding process, thereby increasing the fusion area between the first surface and the mounting structure.

[0024] In some embodiments, there are multiple first protrusions, with at least one first protrusion surrounding the outside of another first protrusion. This is advantageous because, during the rotary friction welding process between the connector and the mounting structure, the molten material from the first protrusions can flow along the rotational trajectory, reducing the risk of interference between the molten materials from each first protrusion on their respective flows. It also helps to increase the fusion area between the first surface and the mounting structure.

[0025] In some embodiments, the area of ​​the cross-section of the first protrusion perpendicular to the first direction gradually increases along the direction close to the connecting body. This allows the end of the first protrusion furthest from the connecting body to melt more quickly, improving the efficiency of the friction welding operation between the connector and the mounting structure.

[0026] In some embodiments, the flange includes a flange body and a second protrusion. The flange body is located on one side of the connecting body along a second direction, and the second protrusion is located on the side of the flange body along a first direction near the first protrusion. The second protrusion protrudes from the flange body along the first direction and is used for friction welding with a plate assembly to form a second surface. Thus, by providing a second surface formed on the second protrusion, it is advantageous to concentrate the heat of friction during the friction welding process on the second protrusion, facilitating faster melting of the second protrusion to form the second surface, thereby improving manufacturing efficiency.

[0027] In some embodiments, in a projection plane perpendicular to the first direction, the projection of the second protrusion along the first direction is annular, and the second protrusion surrounds the connecting body. This allows the molten material from the second protrusion to spread more evenly along the rotational trajectory during the rotary friction welding process, thus increasing the fusion area between the second surface and the plate assembly.

[0028] In some embodiments, there are multiple second protrusions, with at least one second protrusion surrounding the outside of another second protrusion. This is advantageous because, during the rotary friction welding process between the connector and the plate assembly, the molten material from the second protrusions can flow along the rotational trajectory, reducing the risk of interference between the molten materials from each second protrusion and their respective flows. It also helps to increase the fusion area between the second surface and the plate assembly.

[0029] In some embodiments, along the first direction towards the flange body, the area of ​​the cross-section of the second protrusion perpendicular to the first direction gradually increases. This allows the end of the second protrusion furthest from the flange body to melt more quickly, improving the efficiency of friction welding between the connector and the plate assembly. Attached Figure Description

[0030] Figure 1This is a schematic diagram of the electrical device provided in the embodiments of this application;

[0031] Figure 2 This is an exploded schematic diagram of the battery device provided in the embodiments of this application;

[0032] Figure 3 This is a schematic diagram of the connectors, board assemblies, and mounting structures provided in the embodiments of this application;

[0033] Figure 4 yes Figure 3 A cross-sectional diagram of position AA in the middle;

[0034] Figure 5 yes Figure 4 A magnified view of a portion of position B in the diagram;

[0035] Figure 6 This is a partially enlarged cross-sectional view of another embodiment of this application, the enlarged cross-section being located at a position similar to... Figure 4 The position of B in the text is the same;

[0036] Figure 7 This is a schematic diagram of the connector in an embodiment of this application;

[0037] Figure 8 yes Figure 7 A cross-sectional view of the CC position in the middle;

[0038] Figure 9 yes Figure 7 A schematic diagram of the Chinese embodiment from another perspective;

[0039] Figure 10 This is a cross-sectional view of the connector in another embodiment of this application, and the cross-section is located at the same position as... Figure 7 The CC positions are the same.

[0040] Explanation of reference numerals in the attached figures

[0041] 1000, Vehicle; 100, Battery unit; 100a, Installation space; 200, Controller; 300, Motor; 10, Plate assembly; 10a, Fixing through hole; 10b, First contact surface; 11, Plate structure; 11a, Mounting through hole; 111, Thermal management assembly; 112, Protective plate; 20, Mounting structure; 20a, Second contact surface; 21, Box side beam; 22, Limiting beam; 30, Battery cell; 40, Connector; 40a, First surface; 40b, Second surface; 41, Connecting part; 411, Connecting body; 412, First protrusion; 42, Flange part; 421, Flange body; 422, Second protrusion; 50, Box assembly; 51, First box; 52, Second box. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] 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 the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0044] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc., 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.

[0045] 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.

[0046] 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.

[0047] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "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.

[0048] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the 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 application can be understood according to the specific circumstances.

[0049] 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.

[0050] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. Specifically, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0051] In the description of the embodiments of this application, for ease of explanation, as shown in the accompanying drawings, the direction of arrow X is referred to as the "first direction" and the direction of arrow Y is referred to as the "second direction".

[0052] In this embodiment of the 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.

[0053] 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.

[0054] 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. There are no particular limitations in the embodiments of this application.

[0055] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. 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.

[0056] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0057] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0058] In some implementations, the electrode assembly is a stacked structure.

[0059] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0060] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0061] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0062] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0063] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0064] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0065] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0066] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0067] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0068] In some embodiments, a pressure relief mechanism is provided on the casing of the battery cell. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0069] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of a battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0070] As an example, the pressure relief mechanism can be integrally formed with the housing.

[0071] As an example, the pressure relief mechanism can also be separately installed and connected to the outer casing.

[0072] 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.

[0073] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0074] As an example, the battery cell assembly can be part of a battery module, which is formed by arranging and fixing multiple battery cells together to create an independent module. As another example, the battery module can be formed by bundling multiple battery cells together with cable ties.

[0075] In some embodiments, the battery device may be a battery pack, which includes a housing assembly and one or more individual battery cells housed within the housing assembly.

[0076] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing assembly by fixing the battery module in the housing assembly.

[0077] As an example, the battery cell assembly can also be housed in the housing assembly by directly fixing multiple battery cells to the housing assembly.

[0078] As an example, see Figure 2 The housing assembly 50 may include a first housing 51 and a second housing 52. The first housing 51 and the second housing 52 are fastened together to form a closed space inside the housing assembly 50 to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 51 may be a top cover or a bottom plate.

[0079] As an example, the housing assembly 50 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing assembly 50 forms a closed space to accommodate the individual battery cells.

[0080] In some embodiments, the housing assembly 50 may be part of the vehicle's chassis structure. For example, a portion of the housing assembly 50 may be at least a portion of the vehicle's floor, or a portion of the housing assembly 50 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0081] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0082] 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.

[0083] 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 vehicles, etc. For example... 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.

[0084] 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.

[0085] The embodiments of this application will now be described in detail.

[0086] The battery device includes a mounting structure and a plate assembly, the plate assembly and the mounting structure being fixed to at least a portion of a housing for housing individual battery cells.

[0087] In some related technologies, plate assemblies and mounting structures are fixed using bolts and gaskets. However, this requires the matching of bolts and gaskets, making the assembly process cumbersome. Furthermore, during bolt tightening, stress concentration can easily occur in localized areas at the connection points between the bolts and at least one of the mounting structure or plate assembly, leading to damage to the seals and gaskets. In other related technologies, plate assemblies and mounting structures are fixed using the FDS (Flow Drill Screw) process, where screws pierce and undergo plastic deformation. However, the piercing process can cause structural damage at the connection points, potentially creating microcracks or gaps. Over long-term use, this can easily lead to damage to the plate assemblies and mounting structures. Additionally, the screws required for the FDS process are expensive. Moreover, both bolted and FDS connections require clearance space on the plate assemblies and mounting structures for operation, which is detrimental to the compactness of the battery device structure.

[0088] This application provides a battery device, an electrical device, and a connector, wherein the first surface of the connector is fixed to the mounting structure by friction welding, and the second surface of the connector serves to limit the position of the plate assembly, thereby fixing the relative position of the mounting structure and the plate assembly.

[0089] Specifically, see Figures 2 to 5 This application provides a battery device 100, which includes a plate assembly 10, a mounting structure 20, a battery cell 30, and a connector 40.

[0090] The plate assembly 10 is provided with a through fixing hole 10a.

[0091] At least a portion of the mounting structure 20 is located on one side of the fixing through hole 10a along the through direction of the fixing through hole 10a, and at least a portion of the mounting structure 20 together with the plate assembly 10 forms the mounting space 100a.

[0092] At least a portion of the battery cell 30 is located within the installation space 100a.

[0093] The connector 40 includes a first surface 40a and a second surface 40b. A portion of the connector 40 passes through the fixing through hole 10a so that the first surface 40a is fixed to the mounting structure 20 by friction welding. A portion of the plate assembly 10 is located between the mounting structure 20 and the second surface 40b, and the second surface 40b is fixed to the plate assembly 10 by friction welding.

[0094] The installation space 100a is sufficient to install at least the battery cell 30, and the battery cell 30 is protected by the plate assembly 10 and the mounting structure 20.

[0095] Mounting structure 20 refers to the structural components in the battery device 100 used to fix the plate assembly 10, such as the beam structure, mounting base, and housing in the battery device 100.

[0096] The first surface 40a is fixed to the mounting structure 20 by friction welding. This means that during the connection process between the connector 40 and the mounting structure 20, the connector 40 and the mounting structure 20 come into contact and move relative to each other, thereby generating heat and melting at the contact point. The molten parts of the two fuse together and are then fixed after solidification. The first surface 40a is in close contact with the mounting structure 20.

[0097] It is understandable that the first surface 40a is the interface between the connector 40 and the mounting structure 20, formed by the resolidification of the connector 40 after friction welding. The connector 40 is inserted into the fixing through hole 10a.

[0098] A portion of the plate assembly 10 is located between the mounting structure 20 and the second surface 40b, such that, along the two directions of the extension direction of the fixed through hole 10a, the portion of the plate assembly 10 is blocked by the mounting structure 20 and the second surface 40b respectively, so that the position of the plate assembly 10 along the extension direction of the fixed through hole 10a is fixed relative to the mounting structure 20.

[0099] The second surface 40b is the interface between the connector 40 and the plate assembly 10 formed by the resolidification after the friction welding of the connector 40 is completed.

[0100] In this embodiment, the battery device 100 is fixed to the mounting structure 20 by friction welding to the first surface 40a of the connector 40, so that the second surface 40b of the connector 40, together with the mounting structure 20, can limit the relative position of the plate assembly 10 and the mounting structure 20. The connector 40 is fixedly connected to the mounting structure 20 by friction welding, which eliminates the need to pre-prepare threads or other fixing structures on the mounting structure 20 and the connector 40, and also eliminates the need to damage the structure of the mounting structure 20 and the connector 40 during installation. The connector 40 and the mounting structure 20 are in surface contact, which helps to reduce stress concentration. Friction welding can be performed after the connector 40 is inserted into the fixing through hole 10a, which helps to simplify the operation steps, improve production efficiency, and enable the connector 40 to directly connect the plate assembly 10 and the mounting structure 20, thereby better fixing the relative position of the plate assembly 10 and the mounting structure 20 and improving the stability of the connection.

[0101] The relative movement between the connector 40 and the mounting structure 20 to achieve friction welding is not limited. For example, the connector 40 and the mounting structure 20 can rotate relative to each other to achieve friction welding.

[0102] It is understood that in the embodiment where the connector 40 is fixed to the mounting structure 20 by rotary friction welding, the first surface 40a is a circular surface or part of a spherical surface.

[0103] In some embodiments, the mounting through-hole 11a extends in a straight line through the plate assembly 10 so that the connector 40 is inserted into the mounting through-hole 11a.

[0104] It is understood that the specific number of the first surface 40a included in the connector 40 is not limited, and can be one or more, such as one, two, three, four, five, six, etc.; the specific number of the second surface 40b included in the connector 40 is not limited, and can be one or more, such as one, two, three, four, five, six, etc.

[0105] The specific number of mounting through holes 11a included in the board assembly 10 is not limited; it can be one or more, such as one, two, three, four, five, six, etc.

[0106] The second surface 40b can be located inside or outside the fixed through hole 10a.

[0107] It is understandable that the number of mounting through holes 11a corresponds one-to-one with the number of connectors 40.

[0108] It is understandable that during the friction welding operation, when the connector 40 moves relative to the mounting structure 20 to perform the friction welding operation, the portion of the connector 40 forming the first surface 40a and the portion forming the second surface 40b simultaneously rub against the mounting structure 20 and the plate assembly 10, respectively.

[0109] In some embodiments, in the projection plane perpendicular to the extension direction of the mounting through hole 11a, the projection of the first surface 40a along the extension direction of the mounting through hole 11a is circular, and the projection of the second surface 40b along the extension direction of the mounting through hole 11a is an annular surface. The projection of the first surface 40a along the extension direction of the mounting through hole 11a is located inside the projection of the second surface 40b along the extension direction of the mounting through hole 11a, and the two are arranged concentrically.

[0110] In this way, during the friction welding operation, the rotation axis of the portion of the connector 40 that forms the first surface 40a and the portion that forms the second surface 40b is the same, so that the first surface 40a and the second surface 40b are formed simultaneously, simplifying the production process.

[0111] In some embodiments, see Figure 3 and Figure 5 The outer surface of the plate assembly 10 on the side opposite to the mounting structure 20 includes a first contact surface 10b, which is a continuous surface, and at least part of the second surface 40b is friction-welded to the first contact surface 10b.

[0112] In other words, the first contact surface 10b is a complete curved surface or plane, without any pits, grooves, or clearance spaces.

[0113] This simplifies the manufacturing process of the first contact surface 10b and also facilitates increasing the contact area between the first contact surface 10b and the connector 40 during the friction welding process, increasing the size of the second surface 40b, and improving the connection strength.

[0114] In some embodiments, see Figure 5 At least part of the second surface 40b surrounds the periphery of the fixed through hole 10a on the side opposite to the mounting structure 20.

[0115] In this way, the welding area between the connector 40 and the plate assembly 10 seals the fixing through hole 10a and the external space of the plate assembly 10, reducing the risk of foreign objects entering the installation space 100a through the fixing through hole 10a and damaging the battery cell 30. No additional sealing components are required, which helps to reduce the number of components in the battery device 100.

[0116] In some embodiments, see Figure 5 The outer surface of the mounting structure 20 near the plate assembly 10 includes a second contact surface 20a, which is a continuous surface. The first surface 40a is fixed to the second contact surface 20a by friction welding.

[0117] In other words, the second contact surface 20a is a complete curved surface or plane, without any pits, grooves, or clearance spaces.

[0118] This simplifies the manufacturing process of the second contact surface 20a and also increases the contact area between the second contact surface 20a and the connector 40 during the friction welding process, thereby increasing the size of the first surface 40a and improving the connection strength.

[0119] It is understandable that the extension direction of the fixed through hole 10a is the thickness direction of the plate assembly 10.

[0120] The specific structural form of the board assembly 10 is not limited.

[0121] For example, see Figure 5 The board assembly 10 includes a plurality of board structures 11, which are stacked on top of each other. Each board structure 11 has a mounting through hole 11a that penetrates the board structure 11. The mounting through holes 11a of each board structure 11 are connected to each other along the stacking direction to form a fixing through hole 10a.

[0122] In other words, the panel assembly 10 includes multiple independent panel structures 11, and each panel structure 11 is fixed relative to the mounting structure 20 by means of connectors 40.

[0123] In this way, multiple plate structures 11 can be fixed by the connector 40, which helps to reduce the number of parts and simplify the process of connecting and fixing the plate assembly 10 and the mounting structure 20.

[0124] In some embodiments, the thickness direction of the plate assembly 10, the stacking direction between the individual plate structures 11, and the thickness direction of the plate structure 11 are the same.

[0125] In some embodiments, see Figure 6 There are multiple second surfaces 40b, and a portion of each plate structure 11 is located between a second surface 40b and the mounting structure 20.

[0126] In other words, each plate structure 11 is individually fixed relative to the mounting structure 20 via a second surface 40b.

[0127] This improves the fixing effect on each plate structure 11.

[0128] In some embodiments where there are multiple second surfaces 40b, a portion of the second surfaces 40b are located in the fixed through hole 10a, while another portion of the second surfaces 40b are located outside the fixed through hole 10a.

[0129] The specific form of plate structure 11 is not limited.

[0130] For example, see Figure 5 and Figure 6The multiple plate structures 11 include a thermal management assembly 111 and a protective plate 112, with at least a portion of the thermal management assembly 111 located between the mounting structure 20 and the protective plate 112.

[0131] The thermal management component 111 and the battery cell 30 form a heat transfer path through direct or indirect contact. The thermal management component 111 is provided with a flow channel for the flow of the thermal management medium. Through the continuous flow of the thermal management medium and the heat exchange between the thermal management medium and the battery cell 30, the temperature of the battery cell 30 is controlled within a suitable range.

[0132] The protective plate 112 is used to protect the internal components of the battery device 100, such as the thermal management component 111.

[0133] In some embodiments, the space on the side of the protective plate 112 opposite to the mounting space 100a forms part of the outer surface of the battery device 100.

[0134] In some embodiments, see Figure 5 At least part of the second surface 40b is located on the side of the guard plate 112 opposite to the thermal management assembly 111.

[0135] In this way, the connector 40 can fix the position of the thermal management component 111 and the guard plate 112 relative to the mounting structure 20 by friction welding, reducing the risk of damage to the thermal management component 111 during the friction welding process.

[0136] The specific structural form of the mounting structure 20 is not limited.

[0137] For example, see Figure 2 , Figure 4 and Figure 5 The installation structure 20 includes multiple box-shaped side beams 21, which are connected end to end to form an installation cavity. One side of the installation cavity is open, and the plate assembly 10 is placed on the open position of the installation cavity to form an installation space 100a.

[0138] The surface of the side beam 21 of the housing facing away from the mounting cavity forms part of the outer surface of the battery device 100.

[0139] Thus, the box side beam 21 itself has high structural strength, and the plate assembly 10 is fixed to the box side beam 21 through the connector 40, which helps to improve the structural strength of the plate assembly 10.

[0140] For example, see Figure 2 The mounting structure 20 includes at least two limiting beams 22, with multiple battery cells 30 located between the two limiting beams 22, and the two limiting beams 22 being located on one side along the arrangement direction of the multiple battery cells 30. The limiting beams 22 are used to restrict the expansion of the battery cells 30.

[0141] Thus, the limiting beam 22 itself has high structural strength, and the plate assembly 10 is fixed to the box side beam 21 through the connector 40, which helps to improve the structural strength of the plate assembly 10.

[0142] In some embodiments that include a first housing 51 and a second housing 52, at least one of the first housing 51 and the second housing 52 includes a housing side beam 21, a plate assembly 10, and a connector 40.

[0143] In some embodiments, see Figure 5 and Figure 6 The connector 40 is spaced apart from the inner wall of the fixed through hole 10a to reduce the probability that the structure of the inner wall of the fixed through hole 10a will melt and fuse with the connector 40 during the movement of the connector 40 relative to the mounting structure 20.

[0144] In some embodiments, the distance between the connector 40 and the inner wall of the fixed through hole 10a is 0.5 mm (millimetre) to 1 mm.

[0145] In some embodiments, at least a portion of the material of the connector 40 is the same as at least a portion of the material of the mounting structure 20, so that the first surface 40a formed after a portion of the connector 40 melts due to frictional heating remains stably bonded to the mounting structure 20.

[0146] In some embodiments, at least a portion of the material of the connector 40 is the same as at least a portion of the material of the plate assembly 10, so that the second surface 40b formed after a portion of the connector 40 is melted by frictional heating remains stably bonded to the plate assembly 10.

[0147] In some embodiments, at least a portion of the connector 40 is made of the same material as at least a portion of the guard plate 112.

[0148] The battery device 100 in one embodiment of this application is specifically as follows:

[0149] The battery device 100 includes a plate assembly 10, a mounting structure 20, battery cells 30, and a connector 40. The plate assembly 10 has a through-hole 10a. At least a portion of the mounting structure 20 is located on one side of the through-hole 10a along its through-path direction, and the at least portion of the mounting structure 20 and the plate assembly 10 together form a mounting space 100a. At least a portion of the battery cells 30 is located within the mounting space 100a. The connector 40 includes a first surface 40a and a second surface 40b. A portion of the connector 40 passes through the through-hole 10a so that the first surface 40a is friction-welded to the mounting structure 20. A portion of the plate assembly 10 is located between the mounting structure 20 and the second surface 40b. The second surface 40b is friction-welded to the plate assembly 10. The outer surface of the plate assembly 10 facing away from the mounting structure 20 includes a first contact surface 10b, which is a continuous surface. At least a portion of the second surface 40b is friction-welded to the first contact surface 10b. At least a portion of the second surface 40b surrounds the periphery of the fixed through hole 10a on the side opposite to the mounting structure 20. The outer surface of the mounting structure 20 near the plate assembly 10 includes a second contact surface 20a, which is a continuous surface, and the first surface 40a is friction-welded to the second contact surface 20a. The plate assembly 10 includes a plurality of plate structures 11, which are stacked on top of each other. Each plate structure 11 has a through hole 11a extending through it, and the through holes 11a of each plate structure 11 are interconnected along the stacking direction to form the fixed through hole 10a. The plurality of plate structures 11 include a thermal management assembly 111 and a protective plate 112. At least a portion of the thermal management assembly 111 is located between the mounting structure 20 and the protective plate 112, and at least a portion of the second surface 40b is located on the side of the protective plate 112 opposite to the thermal management assembly 111. The mounting structure 20 includes multiple box-shaped side beams 21, which are connected end to end to form a mounting cavity. One side of the mounting cavity is open, and the plate assembly 10 is placed on the open position of the mounting cavity to form a mounting space 100a.

[0150] This application embodiment also provides an electrical device, which includes any of the battery devices 100 in the foregoing embodiments, and the battery devices 100 are used as the power source for the electrical device.

[0151] Thus, by adopting the battery device 100 in the aforementioned embodiments, the overall production and manufacturing cost of the electrical device is reduced, and the overall manufacturing process is simplified.

[0152] In some embodiments, the electrical device is a vehicle 1000, and the plate assembly 10 is located below the battery cell 30 along the height direction of the vehicle 1000.

[0153] In this way, the plate assembly 10 can support the weight of the battery cell 30 and protect the battery cell 30, reducing the risk of damage to the battery device 100 caused by impact from foreign objects on the ground.

[0154] This application embodiment also provides a connector 40 for any of the battery devices 100 in the foregoing embodiments. See also Figure 7 and Figure 8 The connector 40 includes a connecting part 41 and a flange part 42.

[0155] The connecting part 41 includes a connecting body 411 and a first protrusion 412. The connecting body 411 extends along a first direction and the first protrusion 412 is provided on the end face along the first direction. The first protrusion 412 protrudes from the connecting body 411 along the first direction. The first protrusion 412 is used for friction welding with the mounting structure 20 to form a first surface 40a.

[0156] The flange 42 is located on one side of the connecting body 411 along the second direction, where the first direction intersects the second direction. The side surface of the flange 42 along the first direction near the first protrusion 412 is used to form the second surface 40b.

[0157] At least a portion of the connecting part 41 is inserted into the mounting through hole 11a of the plate assembly 10.

[0158] During the friction welding process between the connector 40 and the mounting structure 20, a portion of the connecting part 41 is inserted into the mounting through hole 11a until the first protrusion 412 contacts the mounting structure 20. Then, the connector 40 is driven to move relative to the mounting structure 20, and the first protrusion 412 melts due to the heat generated by friction to form the first surface 40a.

[0159] Thus, by setting the first protrusion 412 to form the first surface 40a, it is beneficial to concentrate the heat of friction on the first protrusion 412 during the friction welding process, so that the first protrusion 412 can melt more quickly to form the first surface 40a, which is beneficial to improving manufacturing efficiency.

[0160] In some embodiments, see Figure 9 In the projection plane perpendicular to the first direction, the projection of the first protrusion 412 along the first direction is an annular shape.

[0161] This allows the molten material from the first protrusion 412 to spread more evenly along the rotation trajectory during the rotary friction welding process of the connector 40, which helps to increase the fusion area between the first surface 40a and the mounting structure 20.

[0162] In some embodiments, see Figure 9 In the projection plane perpendicular to the first direction, the projection of the first protrusion 412 along the first direction is an annular shape.

[0163] It is understandable that the axis of rotation of the connector 40 during the rotary friction welding process extends along the first direction and passes through the geometric center of the projection of the first protrusion 412 along the first direction.

[0164] In some embodiments, see Figure 8 and Figure 9 The number of first protrusions 412 is multiple, and at least one first protrusion 412 surrounds the outside of another first protrusion 412.

[0165] This is beneficial because during the rotational friction welding process between the connector 40 and the mounting structure 20, the molten material of the first protrusion 412 can flow along the rotational trajectory and reduce the risk of interference between the molten materials of each first protrusion 412 on their respective flows. It is also beneficial to expand the fusion area between the first surface 40a and the mounting structure 20.

[0166] In some embodiments, the first protrusions 412 are arranged concentrically.

[0167] The specific number of the first protrusion 412 is not limited, for example, one, two, three, four, etc.

[0168] Understandably, the end of the first protrusion 412 furthest from the connecting body 411 contacts the mounting structure 20.

[0169] In some embodiments, the size of the first protrusion 412 along the first direction ranges from 0.3 mm to 0.8 mm.

[0170] This allows the first protrusion 412 to melt more quickly under the influence of the heat generated by friction.

[0171] The specific value of the dimension of the first protrusion 412 along the first direction can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc.

[0172] The specific method for measuring the size of the first protrusion 412 along the first direction is not limited. For example, at room temperature, the connector 40 is cut off along the first direction, the cross section is placed in the measurement area of ​​the projection measuring instrument, and the two ends of the cross section of the first protrusion 412 along the first direction are selected on the screen to obtain the size of the first protrusion 412 along the first direction.

[0173] In some embodiments where the number of first protrusions 412 is multiple, the individual first protrusions 412 may be connected to each other in a direction perpendicular to the first direction, or they may be spaced apart from each other in a direction perpendicular to the first direction.

[0174] In some embodiments, see Figure 8 Along the direction close to the connecting body 411, the area of ​​the cross section of the first protrusion 412 perpendicular to the first direction gradually increases.

[0175] This allows the end of the first protrusion 412 that is away from the connecting body 411 to melt more quickly, improving the efficiency of the friction welding operation between the connector 40 and the mounting structure 20.

[0176] In some embodiments, see Figure 8 The cross-section of the first protrusion 412 along the first direction is triangular.

[0177] This further facilitates the faster melting of the end of the first protrusion 412 that is away from the connecting body 411.

[0178] In some embodiments where the cross-section of the first protrusion 412 along the first direction is triangular, the angle of the sharp corner of the cross-section of the first protrusion 412 along the first direction away from the end of the connecting body 411 is 30° to 60°.

[0179] In this way, on the one hand, the risk of damage to the end of the first protrusion 412 away from the connecting body 411 due to collision or other factors is reduced during normal transportation of the connector 40; on the other hand, it is beneficial to enable the end of the first protrusion 412 away from the connecting body 411 to melt more quickly.

[0180] The specific value of the angle at which the cross section of the first protrusion 412 along the first direction is away from the sharp angle at the end of the connecting body 411 can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.

[0181] The specific method for measuring the angle of the sharp corner of the first protrusion 412 away from the end of the connecting body 411 along the first direction is not limited. For example, at room temperature, the connector 40 is cut along the first direction, the cross-section is placed in the measurement area of ​​the projection measuring instrument, and the two boundaries of the first protrusion 412 away from the end of the connecting body 411 are selected on the screen to obtain the angle of the sharp corner.

[0182] In some embodiments, see Figure 7 and Figure 8 The flange portion 42 includes a flange body 421 and a second protrusion 422. The flange body 421 is located on one side of the connecting body 411 along the second direction. The second protrusion 422 is located on the side of the flange body 421 along the first direction close to the first protrusion 412. The second protrusion 422 protrudes from the flange body 421 along the first direction. The second protrusion 422 is used for friction welding with the plate assembly 10 to form a second surface 40b.

[0183] Thus, by setting the second protrusion 422 to form the second surface 40b, it is beneficial to concentrate the heat of friction on the second protrusion 422 during the friction welding process, so that the second protrusion 422 can melt more quickly to form the second surface 40b, which is beneficial to improving manufacturing efficiency.

[0184] In some embodiments, the second direction is perpendicular to the first direction.

[0185] In some embodiments, the flange body 421 surrounds the circumference of the connecting body 411 perpendicular to the first direction.

[0186] In some embodiments, see Figure 9 In the projection plane perpendicular to the first direction, the projection of the second protrusion 422 along the first direction is annular, and the second protrusion 422 surrounds and connects to the body 411.

[0187] This allows the molten material from the second protrusion 422 to spread more evenly along the rotation trajectory during the rotary friction welding process of the connector 40, which helps to increase the fusion area between the second surface 40b and the plate assembly 10.

[0188] In some embodiments, see Figure 9 The number of second protrusions 422 is multiple, and at least one second protrusion 422 surrounds the outside of another second protrusion 422.

[0189] This is beneficial because during the rotational friction welding process between the connector 40 and the plate assembly 10, the molten material of the second protrusion 422 can flow along the rotational trajectory and reduce the risk of interference between the molten materials of each second protrusion 422 on their respective flows. It is also beneficial to expand the fusion area between the second surface 40b and the plate assembly 10.

[0190] In some embodiments, the various second protrusions 422 are arranged concentrically.

[0191] The specific number of the second protrusion 422 is not limited, for example, one, two, three, four, etc.

[0192] Understandably, the end of the second protrusion 422 that is away from the flange body 421 contacts the plate assembly 10.

[0193] In some embodiments, the second protrusion 422 has a size ranging from 0.3 mm (millimeters) to 0.8 mm along the first direction.

[0194] This allows the second protrusion 422 to melt more quickly under the influence of the heat generated by friction.

[0195] The specific value of the dimension of the second protrusion 422 along the first direction can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc.

[0196] The method for measuring the dimension of the second protrusion 422 along the first direction is the same as the method for measuring the dimension of the first protrusion 412 along the first direction.

[0197] In some embodiments, see Figure 10 There are multiple flange portions 42, which are arranged along a first direction. In two adjacent flange portions 42 along the first direction, a portion of the flange body 421 of the flange portion 42 on the side away from the first protrusion 412 protrudes along a second direction from the flange body 421 of the flange portion 42 on the side close to the first protrusion 412, and a second protrusion 422 of the flange portion 42 on the side away from the first protrusion 412 is located in the protruding portion.

[0198] This allows the second protrusion 422 of different flange portions 42 to be friction-welded with different plate structures 11 to form the second surface 40b.

[0199] In some embodiments where the number of flange portions 42 is multiple, a single flange portion 42 may have one second protrusion 422 or multiple second protrusions 422.

[0200] In some embodiments, see Figure 8 Along the first direction close to the flange body 421, the area of ​​the cross section of the second protrusion 422 perpendicular to the first direction gradually increases.

[0201] This allows the end of the second protrusion 422 that is away from the flange body 421 to melt more quickly, improving the efficiency of the friction welding operation between the connector 40 and the plate assembly 10.

[0202] In some embodiments, see Figure 8 The cross-section of the second protrusion 422 along the first direction is triangular.

[0203] This further facilitates the faster melting of the end of the second protrusion 422 that is away from the flange body 421.

[0204] In some embodiments where the cross-section of the second protrusion 422 along the first direction is triangular, the angle of the sharp corner of the cross-section of the second protrusion 422 along the first direction away from the end of the flange body 421 is 30° to 60°.

[0205] In this way, on the one hand, the risk of damage to the end of the second protrusion 422 away from the flange body 421 due to collision or other factors is reduced during normal transportation of the connector 40; on the other hand, it is beneficial to enable the end of the second protrusion 422 away from the flange body 421 to melt more quickly.

[0206] The specific value of the angle of the sharp angle of the second protrusion 422 at the end away from the flange body 421 along the first direction can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.

[0207] The specific method for measuring the angle of the cross section of the second protrusion 422 along the first direction away from the end of the flange body 421 can refer to the method for measuring the angle of the cross section of the first protrusion 412 along the first direction away from the end of the connecting body 411.

[0208] The connector 40 in a specific embodiment of this application is as follows:

[0209] The connector 40 includes a connecting portion 41 and a flange portion 42. The connecting portion 41 includes a connecting body 411 and a first protrusion 412. The connecting body 411 extends along a first direction and has the first protrusion 412 on its end face along the first direction. The first protrusion 412 protrudes from the connecting body 411 along the first direction and is used for friction welding with the mounting structure 20 to form a first surface 40a. The flange portion 42 is located on one side of the connecting body 411 along a second direction, where the first and second directions intersect. The side surface of the flange portion 42 near the first protrusion 412 along the first direction is used to form a second surface 40b. In a projection plane perpendicular to the first direction, the projection of the first protrusion 412 along the first direction is annular. There are multiple first protrusions 412, with at least one first protrusion 412 surrounding the outside of another first protrusion 412. Along the direction near the connecting body 411, the area of ​​the cross-section of the first protrusion 412 perpendicular to the first direction gradually increases. The flange portion 42 includes a flange body 421 and a second protrusion 422. The flange body 421 is located on one side of the connecting body 411 along a second direction. The second protrusion 422 is located on the side of the flange body 421 along a first direction near the first protrusion 412. The second protrusion 422 protrudes from the flange body 421 along the first direction and is used for friction welding with the plate assembly 10 to form a second surface 40b. In a projection plane perpendicular to the first direction, the projection of the second protrusion 422 along the first direction is annular, and the second protrusion 422 surrounds the connecting body 411. There are multiple second protrusions 422, with at least one second protrusion 422 surrounding the outside of another second protrusion 422. Along the first direction near the flange body 421, the area of ​​the cross-section of the second protrusion 422 perpendicular to the first direction gradually increases.

[0210] During friction welding, the clamping mechanism of the rotary drive device fixes the connector 40, positioning it in the fixed through hole 10a. After starting the rotary drive device, the connector 40 is driven to rotate at a high speed of 1000 rpm to 3000 rpm, while a pressure of 5 kN to 15 kN is applied along the through direction of the fixed through hole 10a, causing the first protrusion 412 to contact the mounting structure 20 and the second protrusion 422 to contact the plate assembly 10 simultaneously. Due to the small contact area of ​​the first protrusion 412 and the second protrusion 422, the heat generated by the rotational friction is highly concentrated, rapidly melting the material of the first protrusion 412, the second protrusion 422, and their respective contact areas to form a uniform molten pool. Axial pressure is continuously applied until the first protrusion 412 and the second protrusion 422 are completely melted, filling part of the gap between the connector 40 and the plate assembly 10 and between the connector 40 and the mounting structure 20. The pressure is maintained until the molten pool cools and solidifies, thereby forming the first surface 40a and the second surface 40b.

[0211] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and scope of this application are included within the scope of protection of this application.

Claims

1. A battery device, characterized in that, include: The plate assembly has a through-hole for fixing; The mounting structure is at least partially located on one side of the fixing through hole along the through direction of the fixing through hole, and at least part of the mounting structure together with the plate assembly forms a mounting space; The battery cell is at least partially located within the mounting space; A connector includes a first surface and a second surface. A portion of the connector passes through the fixing through hole to allow the first surface to be friction-welded to the mounting structure. A portion of the plate assembly is located between the mounting structure and the second surface, and the second surface is friction-welded to the plate assembly.

2. The battery device according to claim 1, characterized in that, The outer surface of the plate assembly on the side opposite to the mounting structure includes a first contact surface, which is a continuous surface, and at least a portion of the second surface is friction-welded to the first contact surface for fixation.

3. The battery device according to claim 1, characterized in that, At least a portion of the second surface surrounds the periphery of the opening on the side of the fixing through hole opposite to the mounting structure.

4. The battery device according to claim 1, characterized in that, The outer surface of the mounting structure near the plate assembly includes a second contact surface, which is a continuous surface, and the first surface is fixed to the second contact surface by friction welding.

5. The battery device according to claim 1, characterized in that, The plate assembly includes multiple plate structures stacked on top of each other. Each plate structure has a through-hole for mounting, and the through-holes of each plate structure are connected to each other along the stacking direction to form the fixing through-hole.

6. The battery device according to claim 5, characterized in that, The plurality of plate structures include a thermal management component and a protective plate, at least a portion of the thermal management component being located between the mounting structure and the protective plate, and at least a portion of the second surface being located on the side of the protective plate opposite to the thermal management component.

7. The battery device according to claim 1, characterized in that, The installation structure includes multiple box-shaped side beams, which are connected end to end to form an installation cavity. One side of the installation cavity is open, and the plate assembly is placed on the open position of the installation cavity to form the installation space.

8. An electrical device, characterized in that, The electrical device includes the battery device according to any one of claims 1 to 7, the battery device being used as a power source for the electrical device.

9. A connector for the battery device according to any one of claims 1 to 7, characterized in that, The connector includes: The connecting part includes a connecting body and a first protrusion. The connecting body extends along a first direction and the first protrusion is provided on the end face along the first direction. The first protrusion protrudes from the connecting body along the first direction and is used for friction welding with the mounting structure to form a first surface. A flange portion is located on one side of the connecting body along a second direction, where the first direction intersects the second direction. The side surface of the flange portion along the first direction near the first protrusion is used to form a second surface.

10. The connector according to claim 9, characterized in that, In a projection plane perpendicular to the first direction, the projection of the first protrusion along the first direction is an annular shape.

11. The connector according to claim 10, characterized in that, The number of the first protrusions is multiple, and at least one of the first protrusions surrounds the outside of another first protrusion.

12. The connector according to claim 9, characterized in that, Along the direction close to the connecting body, the area of ​​the cross section of the first protrusion perpendicular to the first direction gradually increases.

13. The connector according to claim 9, characterized in that, The flange includes a flange body and a second protrusion. The flange body is located on one side of the connecting body along a second direction, and the second protrusion is located on the side of the flange body close to the first protrusion along a first direction. The second protrusion protrudes from the flange body along the first direction and is used for friction welding with a plate assembly to form a second surface.

14. The connector according to claim 13, characterized in that, In a projection plane perpendicular to the first direction, the projection of the second protrusion along the first direction is annular, and the second protrusion surrounds the connecting body.

15. The connector according to claim 14, characterized in that, The number of the second protrusions is multiple, and at least one of the second protrusions surrounds the outside of another second protrusion.

16. The connector according to claim 13, characterized in that, Along the first direction toward the flange body, the area of ​​the cross section of the second protrusion perpendicular to the first direction gradually increases.

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