Battery device, electrical device, connection structure, and riveting method of connection structure

Abstract

The present application discloses a battery device, an electrical device, a connection structure, and a riveting method for the connection structure. The battery device includes: a battery cell; an electrical connection sheet electrically connected to the battery cell; and a flexible circuit board having a connection portion, and the connection portion is riveted to the electrical connection sheet through a riveting member. In the above technical solution, the connection portion and the electrical connection sheet are riveted together through the riveting member, which can not only effectively improve the connection quality between the electrical connection sheet and the flexible circuit board, thereby effectively improving the reliability of the connection between the electrical connection sheet and the flexible circuit board, but also effectively simplify the connection process between the electrical connection sheet and the flexible circuit board, thereby effectively improving the work efficiency and effectively reducing the cost.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and in particular, to a battery device, an electrical device, a connection structure, and a riveting method for the connection structure. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development. When collecting flexible circuit boards for new energy power batteries, the flexible circuit boards are delivered to the PACK factory for assembly one by one. The assembly factory then processes them through internal equipment to connect the flexible circuit boards to the bus bars.

[0003] In the prior art, the connection between the flexible circuit board and the bus bar usually adopts a laser welding process or an ultrasonic welding process. When connecting the flexible circuit board and the bus bar using the laser welding process or the ultrasonic welding process, there are problems with the welding quality of the welding points, which affects the welding quality of the welding points. In addition, using the welding process results in a complex overall processing flow, inconvenient assembly, and a large investment in hardware. Therefore, how to ensure the connection quality between the flexible circuit board and the bus bar and how to improve the assembly efficiency are technical problems that need to be solved urgently. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application provides a battery device and an electrical device including this battery device. At the same time, this application also provides a connection structure and a riveting method for this connection structure. The battery device can not only effectively improve the connection quality between the electrical connection piece and the flexible circuit board, but also effectively simplify the connection process, thereby effectively improving the working efficiency and effectively reducing the cost.

[0005] In a first aspect, an embodiment of this application provides a battery device, including: a battery cell; an electrical connection piece electrically connected to the battery cell; a flexible circuit board having a connection portion, and the connection portion is riveted to the electrical connection piece through a riveting member.

[0006] In the above technical solution, by providing a battery cell, an electrical connection piece, and a flexible circuit board in the battery device, the electrical connection piece is electrically connected to the battery cell, the flexible circuit board has a connection portion, and the connection portion is riveted to the electrical connection piece through a riveting member. This can not only effectively improve the connection quality between the electrical connection piece and the flexible circuit board, thereby effectively improving the reliability of the connection between the electrical connection piece and the flexible circuit board, but also effectively simplify the connection process between the electrical connection piece and the flexible circuit board, thereby effectively improving the working efficiency and effectively reducing the cost.

[0007] In some embodiments of the present application, the electrical connection piece is formed with a first through hole penetrating the electrical connection piece along the thickness direction of the electrical connection piece, and a second through hole is formed on the connecting portion. The riveting member includes: a riveting cap, a riveting column, and a deformation boss. The riveting column passes through the first through hole and the second through hole, and the riveting cap and the deformation boss are respectively connected to both ends of the riveting column. The circumferences of the first through hole and the second through hole are abutted between the riveting cap and the deformation boss.

[0008] In the above technical solution, the riveting column is passed through the first through hole and the second through hole, the riveting cap and the deformation boss are respectively connected to both ends of the riveting column, and the circumferences of the first through hole and the second through hole are abutted between the riveting cap and the deformation boss, so that the circumferences of the first through hole and the second through hole both bear the abutting force of the riveting member, thereby effectively improving the reliability of the mechanical and electrical connections between the flexible circuit board and the electrical connection piece.

[0009] In some embodiments of the present application, the circumference of the first through hole is bent toward the side where the riveting cap is located along the thickness direction of the electrical connection piece to form a turned-riveting portion, and at least a part of the turned-riveting portion extends obliquely toward the center of the first through hole in the direction from the deformation boss toward the riveting cap.

[0010] In the above technical solution, by bending the circumference of the first through hole toward the side where the riveting cap is located along the thickness direction of the electrical connection piece to form a turned-riveting portion, and at least a part of the turned-riveting portion extends obliquely toward the center of the first through hole in the direction from the deformation boss toward the riveting cap, the contact area between the electrical connection piece and the connecting portion of the flexible circuit board can be effectively increased, thereby effectively guiding the current to be more evenly distributed on the entire contact surface, reducing the contact resistance, and reducing the formation of local resistance hot spots, thereby effectively improving the current transmission efficiency. In addition, the turned-riveting portion can also effectively improve the structural strength of the circumference of the first through hole, thereby improving the connection quality.

[0011] In some embodiments of the present application, the turned-riveting portion includes an inclined section extending in a ring shape along the circumference of the first through hole, and in the direction from the deformation boss toward the riveting cap, the inclined section extends along a straight line arranged obliquely toward the center of the first through hole.

[0012] In the above technical solution, in the direction from the deformation boss toward the riveting cap, extending the inclined section along a straight line arranged obliquely toward the center of the first through hole can effectively reduce the processing difficulty of the turned-riveting portion, thereby effectively improving the processing efficiency.

[0013] In some embodiments of the present application, the angle between the inclined section and the central axis of the first through hole is greater than or equal to 70° and less than or equal to 80°.

[0014] In the above technical solution, by setting the angle between the inclined section and the central axis of the first through hole to be greater than or equal to 70° and less than or equal to 80°, the riveting part can undergo appropriate elastic deformation under the riveting action of the riveting member, so that the connecting part of the electrical connection piece and the flexible circuit board can be closely attached together, thereby effectively increasing the contact area and effectively improving the connection quality.

[0015] In some embodiments of the present application, at least a part of the surface of the riveting cap facing the deformation boss is formed as an inclined surface extending obliquely. In the direction from the outside to the inside in the radial direction of the riveting column, the inclined surface extends obliquely away from the deformation boss.

[0016] In the above technical solution, by forming at least a part of the surface of the riveting cap facing the deformation boss as an inclined surface extending obliquely, and in the direction from the outside to the inside in the radial direction of the riveting column, the inclined surface extends obliquely away from the deformation boss, it can make the circumferences of the first through hole and the second through hole abut more closely together, thereby controlling the relative movement distance between the connecting part of the electrical connection piece and the flexible circuit board within a reasonable range, and thus effectively improving the reliability of the connection between the connecting part of the electrical connection piece and the flexible circuit board.

[0017] In some embodiments of the present application, the angle between the inclined surface and the central axis of the riveting column is greater than or equal to 60°.

[0018] In the above technical solution, by setting the angle between the inclined surface and the central axis of the riveting column to be greater than or equal to 60°, not only can the connecting part of the electrical connection piece and the flexible circuit board be firmly connected together, but also the possibility of damage to the connecting part of the electrical connection piece and the flexible circuit board caused by excessive abutting force borne by the circumferences of the first through hole and the second through hole can be effectively reduced. In other words, it can not only effectively improve the reliability of the connection between the connecting part of the electrical connection piece and the flexible circuit board, but also effectively protect the connecting part of the electrical connection piece and the flexible circuit board.

[0019] In some embodiments of the present application, the inclined surface extends circumferentially along the riveting column to form a ring.

[0020] In the above technical solution, by extending the inclined surface circumferentially along the riveting column to form a ring, not only can the pressure applied by the riveting cap be evenly distributed on the connecting part of the electrical connection piece and the flexible circuit board, reducing the possibility of damage caused by stress concentration, but also the sealing performance of the riveting cap can be effectively improved, protecting the connection part of the electrical connection piece and the flexible circuit board from being damaged, thereby effectively improving the reliability and durability of the connection part.

[0021] In some embodiments of the present application, the riveting cap extends circumferentially along the riveting column to form a ring. In the direction from the outside to the inside in the radial direction of the riveting cap, the riveting cap extends along a straight line extending obliquely away from the deformation boss.

[0022] In the above technical solution, by extending the rivet cap along the circumference of the rivet column into a ring shape, the rivet cap extends along a straight line extending obliquely away from the deformation boss in the radial direction from the outside to the inside of the rivet cap, which can effectively optimize the distribution of stress on the rivet cap and reduce the possibility of local stress concentration, thereby effectively improving the fatigue resistance of the rivet cap, and then effectively improving the service life of the rivet cap and the stability of the connection. In addition, it can also effectively improve the processing efficiency of the riveted parts.

[0023] In some embodiments of the present application, the connecting portion is arranged on the side of the electrical connecting sheet facing the rivet cap, an opening is formed on the side of the connecting portion facing the rivet cap, the copper foil of the connecting portion is configured to be exposed at the opening position, and the rivet cap is connected to the copper foil at the opening position.

[0024] In the above technical solution, an opening is formed on the side of the connecting portion facing the rivet cap, and the copper foil of the connecting portion is configured to be exposed at the opening position. The rivet cap is connected to the copper foil at the opening position, so that a reliable electrical connection can be formed between the rivet cap and the connecting portion of the flexible circuit board, thereby effectively improving the accuracy of electrical signal transmission.

[0025] In some embodiments of the present application, the riveted cap includes a cap body and a protrusion, the cap body abuts against a surface of the connecting portion that is away from the electrical connecting piece, the protrusion is connected to the cap body and is located on the side of the cap body facing the connecting portion, and at least part of the protrusion extends into the opening and is connected to the copper foil.

[0026] In the above technical solution, the raised portion is connected to the cap body and is located on the side of the cap body facing the connecting portion, and at least part of the raised portion extends into the opening and is connected to the copper foil, which can effectively reduce the risk of poor contact between the rivet and the copper foil of the connecting portion, thereby further improving the reliability of the battery device during long-term use.

[0027] In some embodiments of the present application, an end of the protrusion facing away from the cap body is configured to be suitable for piercing the connecting portion, and the opening is formed by the protrusion piercing the connecting portion.

[0028] In the above technical solution, by piercing the connecting part with the end of the protrusion away from the cap body, the opening is formed by the protrusion piercing the connecting part, which can not only further improve the reliability of the connection between the rivet and the connecting part, so that there is a tight mechanical connection and electrical connection between the rivet and the connecting part, but also simplify the processing flow of the connecting part, thereby effectively improving production efficiency.

[0029] In some embodiments of the present application, in a direction from the cap body toward the deformation boss, the protrusion extends obliquely toward the rivet column.

[0030] In the above technical solution, in the direction from the cap body towards the deformation boss, by inclining the convex portion to extend towards the riveting post, the fixing effect of the convex portion on the connecting portion can be further strengthened, so that the electrical connecting piece and the connecting portion can maintain a stable connection even in a vibration or impact environment.

[0031] In some embodiments of the present application, the included angle between the central axis of the convex portion and the riveting post is greater than or equal to 5° and less than or equal to 10°.

[0032] In the above technical solution, by setting the included angle between the central axis of the convex portion and the riveting post to be greater than or equal to 5° and less than or equal to 10°, it can not only effectively protect the convex portion and the electrical connecting piece, but also effectively guide the convex portion to first pierce the connecting portion and then deform and buckle inward, thereby effectively improving the connection effect between the convex portion and the connecting portion.

[0033] In some embodiments of the present application, in the radial direction of the cap body, the distance between the convex portion and the outer radial edge of the cap body is the first spacing, and the distance between the outer radial edge and the inner radial edge of the cap body is the second spacing, wherein the ratio of the first spacing to the second spacing is greater than or equal to 1 / 3 and less than or equal to 1 / 2.

[0034] In the above technical solution, by setting the ratio of the first spacing to the second spacing to be greater than or equal to 1 / 3 and less than or equal to 1 / 2, it can not only effectively reduce the possibility of stress concentration occurring at the edge of the cap body, thereby effectively reducing the risk of damage to the cap body and improving the durability of the cap body, but also enable the convex portion to completely pierce the connecting portion, thereby improving the connection quality between the convex portion and the connecting portion.

[0035] In some embodiments of the present application, in the direction from the cap body towards the deformation boss, the cross-sectional area of the convex portion gradually decreases.

[0036] In the above technical solution, in the direction from the cap body towards the deformation boss, the cross-sectional area of the convex portion gradually decreases, which can help the convex portion gradually pierce the connecting portion during the riveting of the riveting piece, and guide the convex portion to gradually deform and buckle inward after the convex portion pierces the connecting portion, thereby facilitating the riveting operation and effectively improving the riveting efficiency.

[0037] In some embodiments of the present application, the convex portion is in the shape of a polygonal prism, or the convex portion is in the shape of a cone.

[0038] In the above technical solution, by setting the convex portion as a polygonal prism shape or a conical shape, it is possible to effectively increase the stress exerted by the convex portion on the connecting portion when the convex portion pierces the connecting portion, thereby facilitating the piercing of the connecting portion by the convex portion, and further effectively reducing the external force applied during the riveting process and improving the convenience of operation. In addition, it can also make the convex portion fit more closely to the opening edge, thereby further improving the sealing performance at the connection between the convex portion and the connecting portion.

[0039] In some embodiments of the present application, in the axial direction of the riveting post, the height of the convex portion is greater than or equal to 0.5 mm and less than or equal to 1 mm.

[0040] In the above technical solution, in the axial direction of the riveting post, by setting the height of the convex portion to be greater than or equal to 0.5 mm and less than or equal to 1 mm, not only does the convex portion have sufficient height dimensions, so that the convex portion can completely pierce the connecting portion, reducing the possibility of poor contact, thereby effectively improving the reliability of the connection, but also it can effectively reduce the possibility of scratching the electrical connection piece after the convex portion pierces the connecting portion due to the excessive height dimension of the convex portion, thus effectively protecting the electrical connection piece.

[0041] In some embodiments of the present application, the minimum width of the cross-section of the end of the convex portion connected to the cap body is greater than or equal to 0.2 mm.

[0042] In the above technical solution, by setting the minimum width of the cross-section of the end of the convex portion connected to the cap body to be greater than or equal to 0.2 mm, it is possible to make the connection between the convex portion and the cap body have sufficient connection strength, reducing the possibility of damage at the connection between the convex portion and the cap body, thereby effectively improving the reliability and durability of the convex portion.

[0043] In some embodiments of the present application, the end of the convex portion connected to the cap body extends along the circumferential direction of the cap body, and in the circumferential direction of the cap body, the length of one end of the convex portion is greater than or equal to 2 mm and less than or equal to 3 mm.

[0044] In the above technical solution, in the circumferential direction of the cap body, by setting the length of one end of the convex portion to be greater than or equal to 2 mm and less than or equal to 3 mm, it is possible to make the convex portion have sufficient contact area with the copper foil of the connecting portion after piercing the connecting portion, thereby effectively reducing the contact resistance between the convex portion and the copper foil of the connecting portion, reducing the heat accumulation caused by the resistance, and further helping to maintain a stable temperature environment, thereby effectively improving the service life of the connection between the convex portion and the connecting portion.

[0045] In some embodiments of the present application, the number of convex portions is multiple, and the multiple convex portions are arranged at intervals along the circumferential direction of the cap body.

[0046] In the above technical solution, by setting the number of the convex portions to be multiple, and arranging the multiple convex portions at intervals along the circumferential direction of the cap body, the copper foils of the convex portions and the connecting portions can make multi-point contact in the circumferential direction of the cap body, reducing the possibility of poor contact or stress concentration caused by single-point contact, thereby further improving the reliability and stability of the connection between the convex portions and the connecting portions.

[0047] In some embodiments of the present application, the number of the convex portions is greater than or equal to 3 and less than or equal to 5.

[0048] In the above technical solution, by setting the number of the convex portions to be greater than or equal to 3 and less than or equal to 5, it can not only enable good mechanical support and connection effect between the convex portions and the connecting portions, but also avoid excessive number of the convex portions resulting in waste of materials or complex processing, thereby effectively saving costs and effectively improving processing efficiency.

[0049] In some embodiments of the present application, the electrical connection piece is an aluminum sheet.

[0050] In the above technical solution, by setting the electrical connection piece as an aluminum sheet, the weight and production cost of the battery device can be effectively reduced, and the strength and corrosion resistance of the connection piece can be effectively improved, thereby effectively improving the durability and service life of the electrical connection piece.

[0051] In some embodiments of the present application, the riveting piece is integrally formed, and / or the riveting piece is made of aluminum material.

[0052] In the above technical solution, by setting the riveting piece to be integrally formed, not only can the overall strength of the riveting piece be effectively improved, thereby effectively improving the reliability of the connection between the electrical connection piece and the connecting portion, but also the assembly process can be effectively simplified, thereby effectively improving production efficiency; by setting the riveting piece as an aluminum material piece, the conductivity and corrosion resistance of the riveting piece can be effectively improved, reducing resistance loss and effectively protecting the connection portion, thereby effectively improving the efficiency of current transmission and the service life of the riveting piece.

[0053] In some embodiments of the present application, the flexible circuit board includes a plurality of connecting portions arranged at intervals, the number of the electrical connection pieces is multiple, and the multiple electrical connection pieces are connected to the multiple connecting portions in one-to-one correspondence.

[0054] In the above technical solution, by arranging a plurality of connecting portions at intervals on the flexible circuit board, and the number of the electrical connection pieces is multiple, and the multiple electrical connection pieces are connected to the multiple connecting portions in one-to-one correspondence, the flexible circuit board can be provided with a plurality of electrical contact points, so that the distribution of current is more uniform, thereby effectively reducing the risk of local overheating of the flexible circuit board. In addition, it can also enable the battery device to have a reasonable redundancy design, thereby effectively improving the reliability of the battery device.

[0055] In a second aspect, an embodiment of the present application provides an electrical device, which includes a battery device according to the first aspect of the present application.

[0056] In the above technical solution, by setting the battery device of the first aspect mentioned above, and the connecting part of the electrical connecting piece in the battery device and the flexible circuit board is riveted and connected by rivets, not only can the connection quality of the electrical connecting piece and the flexible circuit board be effectively improved, thereby effectively improving the reliability of the connection between the electrical connecting piece and the flexible circuit board, but also the process of connecting the electrical connecting piece and the flexible circuit board can be effectively simplified, thereby effectively improving work efficiency and effectively reducing costs.

[0057] In a third aspect, an embodiment of the present application provides a connection structure, including: an electrical connecting sheet and a flexible circuit board, the electrical connecting sheet is the electrical connecting sheet in the battery device according to the first aspect of the present application, the flexible circuit board is the flexible circuit board in the battery device according to the first aspect of the present application, and the electrical connecting sheet and the flexible circuit board are riveted together by rivets.

[0058] In the above technical solution, the electrical connecting piece and the flexible circuit board are riveted together by rivets, which can not only effectively improve the connection quality between the electrical connecting piece and the flexible circuit board, thereby effectively improving the reliability of the connection between the electrical connecting piece and the flexible circuit board, but also effectively simplify the process of connecting the electrical connecting piece and the flexible circuit board, thereby effectively improving work efficiency and effectively reducing costs.

[0059] In a fourth aspect, an embodiment of the present application provides a riveting method for a connection structure, wherein the connection structure is a connection structure according to the third aspect of the present application, wherein the riveted component comprises a rivet column, a rivet cap and a rivet rod before riveting, wherein the rivet cap is connected to one end of the rivet column in the length direction and extends in a ring shape along the circumference of the rivet column, and the rivet rod is connected to the rivet column and extends along the length direction of the rivet rod toward the side where the rivet cap is located, and the riveting method comprises: S1, passing the rivet column of the riveted component through the first through hole on the electrical connecting piece and the second through hole on the flexible circuit board in sequence, wherein the electrical connecting piece is located on the side of the flexible circuit board away from the rivet cap; S2, making the rivet cap abut against the flexible circuit board; S3, pulling the rivet rod to deform the rivet column located on the side of the electrical connecting piece away from the flexible circuit board to form a deformation boss abutting against the side of the electrical connecting piece away from the flexible circuit board; S4, continuing to pull the rivet rod until the rivet rod is broken.

[0060] In the above technical scheme, not only can the connection quality between the electrical connecting piece and the flexible circuit board be effectively improved, thereby effectively improving the reliability of the connection between the electrical connecting piece and the flexible circuit board, but the process of connecting the electrical connecting piece and the flexible circuit board can also be effectively simplified, thereby effectively improving work efficiency and effectively reducing costs.

[0061] In some embodiments of the present application, the riveting cap includes a cap body and a protruding portion. The protruding portion is connected to the cap body and is located on the side of the cap body facing the connecting portion. The protruding portion is configured to be suitable for piercing the flexible circuit board. In step S3, after pulling the riveting rod, step S3 further includes: piercing the flexible circuit board with the protruding portion and connecting it to the copper foil inside the flexible circuit board.

[0062] In the above technical solution, after pulling the riveting rod in step S3, setting the protruding portion to pierce the flexible circuit board and connecting it to the copper foil inside the flexible circuit board can not only further improve the connection effect between the riveting part and the connecting portion, but also simplify the processing flow of the connecting portion, thereby effectively improving the production efficiency.

[0063] In some embodiments of the present application, the first through hole on the electrical connection piece is formed by stamping.

[0064] In the above technical solution, forming the first through hole on the electrical connection piece by stamping can complete the processing of multiple first through holes in a short time, thereby effectively improving the processing efficiency of the first through hole. In addition, the stamping process can also accurately control the size and position of the first through hole and effectively reduce the possibility of defects caused by manual operation or other machining, thereby effectively improving the processing quality of the first through hole.

[0065] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0066] Figure 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application;

[0067] Figure 2 is an exploded view of a battery device according to an embodiment of the present application;

[0068] Figure 3 is a schematic structural diagram during the riveting process of a connection structure according to an embodiment of the present application;

[0069] Figure 4 is a schematic structural diagram of a connection structure according to an embodiment of the present application;

[0070] Figure 5 is a cross-sectional view of a connection structure according to an embodiment of the present application;

[0071] Figure 6 is a schematic structural diagram of an electrical connection piece according to an embodiment of the present application;

[0072] Figure 7 is Figure 6 a top view of the electrical connection piece shown in

[0073] Figure 8 is Figure 6 the front view of the electrical connection piece shown in

[0074] Figure 9 is Figure 6 the left view of the electrical connection piece shown in

[0075] Figure 10 the structural schematic diagram of the riveting piece before riveting according to the embodiment of the present application;

[0076] Figure 11 is Figure 10 the bottom view of the riveting piece shown in

[0077] Reference numerals:

[0078] 1, electrical device;

[0079] 100, battery device;

[0080] 10, battery cell;

[0081] 20, box body; 21, box main body; 22, cover body;

[0082] 30, connection structure;

[0083] 31, electrical connection piece;

[0084] 310, first through hole; 311, turned-over riveting part; 3111, inclined section; 3112, horizontal section;

[0085] 32, flexible circuit board; 321, connection part;

[0086] 33, riveting piece; 331, riveting cap; 3311, cap main body; 3312, protruding part; 332, riveting column; 333, deformation boss; 333a, riveting post; 334, riveting rod; 3341, clamping part;

[0087] 200, controller;

[0088] 300, motor. Detailed implementation manners

[0089] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0090] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0091] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0092] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0093] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0094] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two).

[0095] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0096] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0097] The battery device (Battery Apparatus) mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include one or more battery cells. When there are multiple battery cells, the multiple battery cells are connected in series, parallel or in a hybrid connection through a busbar component.

[0098] In some embodiments, the battery cell assembly (Battery Cell Assembly) is usually formed by arranging multiple battery cells; as an example, the battery cell assembly can be a battery module (Battery Module), and the battery module is formed by arranging and fixing multiple battery cells into an independent module. As an example, the battery module can be formed by bundling multiple battery cells with cable ties.

[0099] In some embodiments, the battery device can be a battery pack (battery Pack), and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0100] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0101] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing multiple battery cells to the box body.

[0102] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are snapped together so that a closed space is formed inside the box body to accommodate the battery cell assembly. The "closed" here means covered or closed, which can be sealed or non-sealed. The first box body can be a top cover or a bottom plate.

[0103] As an example, the box body 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 a closed space is formed inside the box body to accommodate the battery cell assembly.

[0104] As an example, the box body can be part of the chassis structure of a vehicle. For example, the top cover of the box body can become at least part of the floor of the vehicle, or the frame of the box body can become at least part of the cross beams and longitudinal beams of the vehicle.

[0105] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box body with a door provided on at least one side thereof. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0106] The battery cells mentioned in the embodiments of the present application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, etc., and the embodiments of the present application are not limited thereto. The battery cells can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, and the embodiments of the present application are not limited thereto either. Generally, the battery cells are divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present application are not limited thereto either.

[0107] Exemplarily, a battery cell generally includes a housing, a battery core assembly, and an electrolyte. The housing is used to accommodate the battery core assembly and the electrolyte, and at least one positive electrode terminal and at least one negative electrode terminal are provided on the housing. The battery core assembly includes one or more electrode assemblies, and the electrode assemblies are formed by laminating or winding a positive electrode plate, a negative electrode plate, and a separator.

[0108] Among them, the positive electrode plate generally includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, and the positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer coated thereon. The positive electrode current collector without the positive electrode active material layer serves as the positive electrode tab, and a plurality of positive electrode tabs are stacked together and electrically connected to the positive electrode terminal.

[0109] The negative electrode plate generally includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is directly or indirectly coated on the negative electrode current collector, and the negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer coated thereon. The negative electrode current collector without the negative electrode active material layer serves as the negative electrode tab, and a plurality of negative electrode tabs are stacked together and electrically connected to the negative electrode terminal. At the same time, the battery cell mainly operates by the movement of metal ions between the positive electrode plate and the negative electrode plate.

[0110] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery devices, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, and vehicles, etc.

[0111] In recent years, new energy vehicles have witnessed a leapfrog development. In the field of electric vehicles, the battery device, as the power source of the electric vehicle, plays an irreplaceable and important role. Among them, during the assembly process of the battery device of the electric vehicle, the connection quality between the flexible circuit board and the bus bar is crucial for improving the reliability and performance of the battery device.

[0112] In the battery device in the related art, during the assembly of the battery device, the connection between the flexible circuit board and the bus bar in the battery device usually adopts a laser welding process or an ultrasonic welding process. However, using the welding process results in problems such as thermal damage or poor soldering at the welding point, which affect the welding quality, and the welding process is time-consuming and laborious. In addition, when using the laser welding process, a nickel sheet needs to be set between the flexible circuit board and the bus bar. One end of the nickel sheet is welded to the bus bar, and the other end of the nickel sheet is welded to the flexible circuit board by a reflow soldering process. The reflow soldering process is complex and the cost of the nickel sheet is relatively high. When using the ultrasonic welding process, the requirements for the welding point are relatively high, and after welding, glue needs to be applied for antioxidant protection, and the connection process is complex, resulting in low work efficiency.

[0113] Based on the above considerations, in order to improve the connection quality between the flexible circuit board and the bus bar and improve work efficiency, the present application designs a battery device. The flexible circuit board of the battery device has a connection part, and the connection part is riveted to the electrical connection piece through a riveting part. Riveting connection is a mechanical connection method. Compared with the welding process, there are no problems such as poor soldering that affect the welding quality at the connection, and the riveting connection is not easily affected by the skill level of the operator or the performance of the welding equipment. Therefore, the riveting connection can provide a reliable and consistent connection effect, thereby effectively improving the connection quality between the flexible circuit board and the bus bar. In addition, compared with the welding process, the riveting connection process is simple, easy to operate, and does not require the use of nickel sheets, so it can effectively simplify the connection process between the flexible circuit board and the bus bar, reduce the assembly difficulty, and thus effectively improve work efficiency.

[0114] The embodiment of the present application provides an electrical device using the battery device of the present disclosure as a power source. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console and an electric vehicle toy, and the like.

[0115] For the convenience of description in the following embodiments, taking the electrical device as a vehicle as an example, the structures of the electrical device and the battery device of the present application are introduced in detail.

[0116] Please refer to Figure 1 , Figure 1The structural schematic diagram of the power consumption device provided for some embodiments of the present application is for a vehicle. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle, etc. The vehicle is provided with a battery device, and the battery device can be arranged at the bottom, the head, or the tail of the vehicle. The battery device can be used for power supply of the vehicle. For example, the battery device can be used as the operating power source of the vehicle. The vehicle can also include a controller and a motor, and the controller is used to control the battery device to supply power to the motor. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle. In some embodiments of the present application, the battery device can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0117] Please refer to Figure 2 , Figure 2 The explosion diagram of the battery device provided for some embodiments of the present application. The battery device includes a box body and a plurality of battery cells, and the box body is used to provide an assembly space for the battery cells, and the battery cells are accommodated in the box body. Figure 3 is the structural schematic diagram during the riveting process of the connection structure according to the embodiment of the present application; Figure 4 is the structural schematic diagram of the connection structure according to the embodiment of the present application; Figure 5 is the cross-sectional view of the connection structure according to the embodiment of the present application; Figure 6 is the structural schematic diagram of the electrical connection piece according to the embodiment of the present application; Figure 7 is Figure 6 the top view of the electrical connection piece shown in Figure 8 is Figure 6 the front view of the electrical connection piece shown in Figure 9 is Figure 6 the left view of the electrical connection piece shown in Figure 10 is the structural schematic diagram of the riveting part before riveting according to the embodiment of the present application; Figure 11 is Figure 10 the bottom view of the riveting part shown in

[0118] Next, refer to Figures 2 - 11 to describe the battery device 100 according to the embodiment of the first aspect of the present application.

[0119] An embodiment of the present application proposes a battery device 100. As Figures 2 - 5 shown, the battery device 100 includes: a battery cell 10, an electrical connection piece 31, and a flexible circuit board 32. The electrical connection piece 31 is electrically connected to the battery cell 10; the flexible circuit board 32 has a connection part 321, and the connection part 321 is riveted and connected to the electrical connection piece 31 through a riveting part 33.

[0120] It should be noted that multiple battery cells 10 are connected in series or in parallel through electrical connection pieces 31 to form a complete battery module, thereby realizing the storage and transportation of electric energy. It should be noted that the flexible circuit board 32 is a key component of the battery management system, which is used to connect various modules inside the power battery, such as battery cells, sensors, controllers 200, etc., to transmit electric energy and data signals, and to realize the real-time monitoring and control of the state of the battery device 100, including the acquisition and transmission of parameters such as voltage, current, and temperature, so as to detect abnormal conditions of the battery device 100 in time and perform corresponding protection and management.

[0121] In some specific examples, such as Figures 3 - 5 shown, the electrical connection piece 31 is electrically connected to the battery cell 10, and the connecting portion 321 of the flexible circuit board 32 is connected to the electrical connection piece 31. Further, the connecting portion 321 is integrally formed with the flexible circuit board 32 and extends outwardly toward the flexible circuit board 32. Both the electrical connection piece 31 and the connecting portion 321 have sufficient mechanical strength to withstand the pressure during the riveting process, so that there is good electrical contact between the electrical connection piece 31 and the flexible circuit board 32. When the flexible circuit board 32 and the electrical connection piece 31 are riveted together by a riveting member 33, the electrical signal can be sequentially transmitted to the electrical connection piece 31, the riveting member 33, the flexible circuit board 32, and the battery management system, thereby realizing the real-time monitoring and control of the state of the battery device 100.

[0122] It should be noted that in the prior art, during the assembly process of the battery device 100, the connection between the flexible circuit board 32 and the tab in the battery device 100 usually adopts a laser welding process or an ultrasonic welding process. However, the welding process causes problems such as thermal damage or false soldering at the welding point, which affect the welding quality, and the welding process is time-consuming and laborious. In addition, when using the laser welding process, a nickel sheet usually needs to be provided between the flexible circuit board 32 and the tab. One end of the nickel sheet is welded to the tab, and the other end of the nickel sheet is welded to the flexible circuit board 32 by a reflow soldering process. The reflow soldering process is complex and the cost of the nickel sheet is relatively high. When using the ultrasonic welding process, the requirements for the welding point are relatively high, and after welding, it is necessary to apply glue to resist oxidation, and the connection process is complex, resulting in low work efficiency.

[0123] In this embodiment, a connecting portion 321 is provided on the flexible circuit board 32. The connecting portion 321 and the electrical connection piece 31 are riveted and connected by a riveting member 33. As a mechanical connection method, riveting connection can achieve a strong bond between the flexible circuit board 32 and the electrical connection piece 31 without using high temperature, and there are no problems such as thermal damage or false soldering that may occur during the soldering process. Thus, the connection quality between the flexible circuit board 32 and the electrical connection piece 31 is effectively improved, and further the reliability of the connection between the flexible circuit board 32 and the electrical connection piece 31 is effectively improved. Moreover, riveting connection is not easily affected by the skill level of the operator or the performance of the soldering equipment, so that the consistency of the connection effect between the flexible circuit board 32 and the electrical connection piece 31 can be effectively improved.

[0124] In addition, compared with the soldering process, the riveting connection process is simple and convenient to operate, so that the connection process between the flexible circuit board 32 and the bar piece can be effectively simplified, the assembly difficulty can be reduced, and further the work efficiency can be effectively improved. And riveting connection does not require a nickel piece to be used for connecting the electrical connection piece 31 by transition, so that the cost can be effectively reduced.

[0125] In the above technical solution, by providing the battery cell 10, the electrical connection piece 31 and the flexible circuit board 32 in the battery device 100, the electrical connection piece 31 is electrically connected to the battery cell 10, the flexible circuit board 32 has a connecting portion 321, and the connecting portion 321 and the electrical connection piece 31 are riveted and connected by a riveting member 33. This can not only effectively improve the connection quality between the electrical connection piece 31 and the flexible circuit board 32, thus effectively improving the reliability of the connection between the electrical connection piece 31 and the flexible circuit board 32, but also effectively simplify the connection process between the electrical connection piece 31 and the flexible circuit board 32, thereby effectively improving the work efficiency and effectively reducing the cost.

[0126] In some embodiments of the present application, as Figures 4 - 9 shown, the electrical connection piece 31 is formed with a first through hole 310 penetrating the electrical connection piece 31 along the thickness direction of the electrical connection piece 31 (for example, the Z direction shown in Figure 6 ). The connecting portion 321 is formed with a second through hole. The riveting member 33 includes a riveting cap 331, a riveting column 332 and a deformation boss 333. The riveting column 332 is inserted into the first through hole 310 and the second through hole. The riveting cap 331 and the deformation boss 333 are respectively connected to both ends of the riveting column 332. The peripheries of the first through hole 310 and the second through hole are abutted between the riveting cap 331 and the deformation boss 333.

[0127] In some specific examples, as Figure 6 and Figure 7As shown, the thickness direction of the electrical connection piece 31 is the Z direction, and the Z direction is the up and down direction. One end of the electrical connection piece 31 is provided with a first through hole 310 that penetrates the electrical connection piece 31 in the up and down direction. A second through hole that penetrates the electrical connection piece 31 in the up and down direction is formed on the connecting portion 321. Further, both the first through hole 310 and the second through hole are circular holes. Thus, the stress distribution along the circumferences of the first through hole 310 and the second through hole can be made uniform, effectively reducing the possibility of damage caused by stress concentration.

[0128] For example Figure 4 and Figure 5 As shown, when the riveting piece 33 rivets the flexible circuit board 32 and the electrical connection piece 31 together, the riveting post 332 of the riveting piece 33 passes through the first through hole 310 and the second through hole, and the riveting post 332 of the riveting piece 33 is arranged between the riveting cap 331 and the deformation boss 333. Further, the upper end of the riveting post 332 is connected to the riveting cap 331, and the lower end of the riveting post 332 is connected to the deformation boss 333. The diameters of both the riveting cap 331 and the riveting post 332 are larger than the diameters of the first through hole 310 and the second through hole. The connecting portion 321 of the flexible circuit board 32 and the electrical connection piece 31 are located between the riveting cap 331 and the deformation boss 333, and the connecting portion 321 of the flexible circuit board 32 is arranged on the upper side of the electrical connection piece 31.

[0129] Under the riveting action of the riveting piece 33, the riveting post 332 can apply a pulling force towards the electrical connection piece 31 to the deformation boss 333, so that the deformation boss 333 can firmly abut against the lower circumferential edge of the first through hole 310, and the riveting post 332 can apply a pulling force towards the connecting portion 321 of the flexible circuit board 32 to the riveting cap 331, so that the riveting cap 331 can firmly abut against the upper circumferential edge of the second through hole.

[0130] That is to say, the deformation boss 333 can apply an upward abutting force to the lower circumferential edge of the first through hole 310, and the riveting cap 331 can apply a downward abutting force to the upper circumferential edge of the second through hole. Thus, the riveting piece 33 can firmly abut the connecting portion 321 of the flexible circuit board 32 and the electrical connection piece 31 between the deformation boss 333 and the riveting cap 331, thereby effectively realizing a firm mechanical and electrical connection between the flexible circuit board 32 and the electrical connection piece 31.

[0131] In the above technical solution, the riveting post 332 is passed through the first through hole 310 and the second through hole. The riveting cap 331 and the deformation boss 333 are respectively connected to both ends of the riveting post 332. The circumferences of the first through hole 310 and the second through hole abut between the riveting cap 331 and the deformation boss 333, so that the circumferences of both the first through hole 310 and the second through hole bear the abutting force of the riveting piece 33, thereby effectively improving the reliability of the mechanical and electrical connection between the flexible circuit board 32 and the electrical connection piece 31.

[0132] In some embodiments of the present application, as Figures 5 - 9 shown, the peripheral edge of the first through hole 310 is bent towards the side where the riveting cap 331 is located along the thickness direction of the electrical connection piece 31 (for example, Figure 5 the Z direction shown in Figure 5 ) to form a turned-over riveting portion 311. In the direction from the deformation boss 333 towards the riveting cap 331 (for example,

[0133] the Z direction shown in Figure 5 ), at least a part of the turned-over riveting portion 311 extends obliquely towards the center of the first through hole 310.

[0134] For example, a part of the turned-over riveting portion 311 extends obliquely towards the center of the first through hole 310; or, the entire turned-over riveting portion 311 extends obliquely towards the center of the first through hole 310. In some specific examples, as

[0135] shown, the riveting cap 331 is arranged on the upper side of the end of the electrical connection piece 31 where the first through hole 310 is provided. The peripheral edge of the first through hole 310 is turned up to form a turned-over riveting portion 311. In the direction from bottom to top, a part of the turned-over riveting portion 311 extends obliquely towards the center of the first through hole 310, and another part of the turned-over riveting portion 311 extends horizontally towards the center of the first through hole 310. Figures 5 - 9 In the above technical solution, by bending the peripheral edge of the first through hole 310 towards the side where the riveting cap 331 is located along the thickness direction of the electrical connection piece 31 to form a turned-over riveting portion 311, and in the direction from the deformation boss 333 towards the riveting cap 331, at least a part of the turned-over riveting portion 311 extends obliquely towards the center of the first through hole 310, the contact area between the electrical connection piece 31 and the connection portion 321 of the flexible circuit board 32 can be effectively increased, so as to effectively guide the current to be more evenly distributed on the entire contact surface, reduce the contact resistance, reduce the formation of local resistance hot spots, and thus effectively improve the current transmission efficiency. In addition, the turned-over riveting portion 311 can also effectively improve the structural strength of the peripheral edge of the first through hole 310, thereby improving the connection quality. Figure 5 In some embodiments of the present application, as

[0136] In some specific examples, the clinching portion 311 includes an inclined section 3111 extending circumferentially along the first through hole 310 to form a ring and a horizontal section 3112. In the upward direction from bottom to top, the inclined section 3111 extends along a straight line inclined toward the center of the first through hole 310, and the horizontal section 3112 extends along a straight line horizontally arranged toward the center of the first through hole 310, and the horizontal section 3112 is arranged on the upper side of the inclined section 3111.

[0137] In the above technical solution, in the direction from the deformation boss 333 toward the riveting cap 331, extending the inclined section 3111 along a straight line inclined toward the center of the first through hole 310 can effectively reduce the processing difficulty of the clinching portion 311, thereby effectively improving the processing efficiency.

[0138] In some embodiments of the present application, as Figures 5 - 9 shown, the included angle between the inclined section 3111 and the central axis of the first through hole 310 is greater than or equal to 70° and less than or equal to 80°.

[0139] For example Figure 5 shown, the included angle α between the inclined section 3111 and the central axis of the first through hole 310 can be 70°, 72°, 74°, 76°, 78°, and 80°.

[0140] In the above technical solution, by setting the included angle between the inclined section 3111 and the central axis of the first through hole 310 to be greater than or equal to 70° and less than or equal to 80°, the clinching portion 311 can undergo appropriate elastic deformation under the riveting action of the riveting member 33, so that the connecting portion 321 of the electrical connection piece 31 and the flexible circuit board 32 can be closely attached together, thereby effectively increasing the contact area and effectively improving the connection quality.

[0141] It should be noted that the included angle α between the inclined section 3111 and the central axis of the first through hole 310 can be measured by measuring tools such as a coordinate measuring machine, an angle gauge, and a universal bevel protractor. Taking a coordinate measuring machine as an example below, the measuring method of the included angle α between the inclined section 3111 and the central axis of the first through hole 310 is described. First, the data points on the surface of the workpiece are obtained by using the probe contact or laser scanning method of the coordinate measuring machine, and then the geometric parameters such as the angle are calculated based on the data points.

[0142] In some embodiments of the present application, as Figure 5 shown, at least a part of the surface of the riveting cap 331 facing the deformation boss 333 is formed into an inclined surface extending obliquely. In the direction from the outside to the inside in the radial direction of the riveting column 332 (for example Figure 5 the Z direction shown in

[0143] For example, a part of the surface of the riveting cap 331 facing the deformation boss 333 is formed as an inclined surface extending obliquely; alternatively, the entire surface of the riveting cap 331 facing the deformation boss 333 is formed as an inclined surface extending obliquely. In some specific examples, as Figure 5 shown, the entire lower surface of the riveting cap 331 is formed as an inclined surface extending obliquely. That is to say, there is an included angle between the inclined surface formed by the lower surface of the riveting cap 331 and the plane perpendicular to the central axis of the riveting post 332. Further, as Figure 5 shown, in the direction from the outside to the inside in the radial direction of the riveting post 332, the inclined surface extends obliquely upward. That is to say, the inclined surface gradually rises from the outside to the inside of the riveting cap 331.

[0144] Thus, when the connecting portion 321 of the flexible circuit board 32 and the electrical connection piece 31 are riveted and connected together by the riveting member 33, the area of the abutting surface of the riveting cap 331 can be effectively reduced, thereby effectively increasing the stress on the abutting surface of the riveting cap 331, and further enabling the outer edge of the riveting cap 331 and the deformation boss 333 to abut the peripheries of the first through hole 310 and the second through hole more tightly together.

[0145] In the above technical solution, at least a part of the surface of the riveting cap 331 facing the deformation boss 333 is formed as an inclined surface extending obliquely. In the direction from the outside to the inside in the radial direction of the riveting post 332, the inclined surface extends obliquely away from the deformation boss 333, which can make the peripheries of the first through hole 310 and the second through hole abut more tightly together, thereby controlling the relative movement distance between the electrical connection piece 31 and the connecting portion 321 of the flexible circuit board 32 within a reasonable range, and effectively improving the connection reliability between the electrical connection piece 31 and the connecting portion 321 of the flexible circuit board 32.

[0146] In some embodiments of the present application, as Figure 5 shown, the included angle between the inclined surface and the central axis of the riveting post 332 is greater than or equal to 60°.

[0147] For example, the included angle θ between the inclined surface and the central axis of the riveting post 332 can be 60°, 62°, 64°, 66°, 68°, and 70°. In some specific examples, the included angle θ between the inclined surface and the central axis of the riveting post 332 is less than the included angle α between the inclined section 3111 of the turned-over riveting portion 311 and the central axis of the first through hole 310.

[0148] In the above technical solution, by setting the angle between the inclined plane and the central axis of the riveting post 332 to be greater than or equal to 60°, not only can the connecting portion 321 of the electrical connection piece 31 and the flexible circuit board 32 be firmly connected together, but also the possibility of damage to the connecting portion 321 of the electrical connection piece 31 and the flexible circuit board 32 caused by excessive abutting force borne by the peripheries of the first through hole 310 and the second through hole can be effectively reduced. In other words, it can not only effectively improve the reliability of the connection of the connecting portion 321 of the electrical connection piece 31 and the flexible circuit board 32, but also effectively protect the connecting portion 321 of the electrical connection piece 31 and the flexible circuit board 32.

[0149] It should be noted that the angle θ between the inclined plane and the central axis of the riveting post 332 can be measured by measuring tools such as a coordinate measuring machine, an angle gauge, and a universal bevel protractor. Taking the coordinate measuring machine as an example below, the measuring method of the angle θ between the inclined plane and the central axis of the riveting post 332 is described. First, the data points on the surface of the workpiece are obtained by using the probe contact or laser scanning of the coordinate measuring machine, and then the geometric parameters such as the angle are calculated based on the data points.

[0150] In some embodiments of the present application, as Figure 5 shown, the inclined plane extends circumferentially along the riveting post 332 to form a ring.

[0151] In some specific examples, as Figure 5 shown, the inclined plane on the side of the riveting cap 331 facing the deformation boss 333 extends circumferentially along the riveting post 332 to be arranged in a ring structure, that is to say, the inclined plane is a continuous ring. Further, the inclined plane is evenly distributed in the circumferential direction of the riveting post 332.

[0152] When the connecting portion 321 of the flexible circuit board 32 and the electrical connection piece 31 are riveted and connected together by the riveting member 33, the lower peripheral edge of the inclined plane extending circumferentially along the riveting post 332 can evenly fit the peripheral edge of the first through hole 310 and the peripheral edge of the second through hole. That is to say, the lower peripheral edge of the inclined plane can evenly distribute the applied pressure on the peripheral edge of the first through hole 310 and the peripheral edge of the second through hole, reducing the possibility of damage caused by excessive local stress. In addition, the inclined plane extending circumferentially along the riveting post 332 forms a closed space inside the riveting cap 331, thereby effectively reducing the risk of air or other pollutants entering the internal space of the riveting cap 331.

[0153] In the above technical solution, by extending the inclined plane circumferentially along the riveting column 332 into a ring shape, not only can the pressure exerted by the riveting cap 331 be evenly distributed on the connecting portion 321 of the electrical connecting piece 31 and the flexible circuit board 32, reducing the possibility of damage caused by stress concentration, but also the sealing performance of the riveting cap 331 can be effectively improved, protecting the connection part of the electrical connecting piece 31 and the flexible circuit board 32 from damage, thereby effectively improving the reliability and durability of the connection part.

[0154] In some embodiments of the present application, as Figure 4 and Figure 5 shown, the riveting cap 331 extends circumferentially along the riveting column 332 into a ring shape. In the direction from the outside to the inside in the radial direction of the riveting cap 331, the riveting cap 331 extends along a straight line that is inclined away from the deformation boss 333.

[0155] In some specific examples, as Figure 4 and Figure 5 shown, the riveting cap 331 extends circumferentially along the riveting column 332 into a ring structure. Further, the riveting caps 331 are evenly distributed circumferentially along the riveting column 332. For example Figure 5 shown, in the direction from the outside to the inside in the radial direction of the riveting cap 331, the riveting cap 331 gradually rises along a straight line, forming a structure similar to a frustum of a cone.

[0156] Thereby, the external force acting on the riveting cap 331 can be evenly distributed on the riveting cap 331, reducing the possibility of damage caused by excessive local stress on the riveting cap 331, and thus effectively reducing the possibility of loosening between the connecting portion 321 of the electrical connecting piece 31 and the flexible circuit board 32. In addition, the structural configuration of the riveting cap 331 can be effectively simplified, facilitating the processing and manufacturing of the riveting cap 331, thereby effectively improving the processing efficiency of the riveting part 33.

[0157] In the above technical solution, by extending the riveting cap 331 circumferentially along the riveting column 332 into a ring shape, and in the direction from the outside to the inside in the radial direction of the riveting cap 331, the riveting cap 331 extends along a straight line that is inclined away from the deformation boss 333, the stress distribution on the riveting cap 331 can be effectively optimized, reducing the possibility of local stress concentration, thereby effectively improving the fatigue resistance of the riveting cap 331, and further effectively improving the service life of the riveting cap 331 and the stability of the connection part. In addition, the processing efficiency of the riveting part 33 can be effectively improved.

[0158] In some embodiments of the present application, as Figures 3 - 5As shown, the connecting portion 321 is disposed on a side of the electrical connecting piece 31 facing the riveting cap 331. An opening is formed on a side of the connecting portion 321 facing the riveting cap 331. The copper foil of the connecting portion 321 is configured to be exposed at the opening position, and the riveting cap 331 is connected to the copper foil at the opening position.

[0159] In some specific examples, such as Figures 3 - 5 As shown, the connecting portion 321 of the flexible circuit board 32 is disposed on the upper side of the electrical connecting piece 31. That is to say, the connecting portion 321 of the flexible circuit board 32 is disposed between the electrical connecting piece 31 and the riveting cap 331. Further, the connecting portion 321 of the flexible circuit board 32 is composed of a copper foil and insulating layers covering the upper and lower surfaces of the copper foil. Among them, an opening is formed in the insulating layer located on the upper side surface of the copper foil, so that the copper foil of the connecting portion 321 of the flexible circuit board 32 is exposed at the opening position.

[0160] When the connecting portion 321 of the flexible circuit board 32 and the electrical connecting piece 31 are riveted and connected together by the riveting member 33, the riveting cap 331 can abut against the periphery of the second through hole and the riveting cap 331 can contact the copper foil at the opening position. That is to say, the riveting cap 331 is directly connected to the copper foil of the connecting portion 321 without other intermediate media. Thus, a reliable current transmission path can be formed and the current transmission efficiency is improved.

[0161] In the above technical solution, by forming an opening on a side of the connecting portion 321 facing the riveting cap 331, the copper foil of the connecting portion 321 is configured to be exposed at the opening position, and the riveting cap 331 is connected to the copper foil at the opening position, so that a reliable electrical connection can be formed between the riveting cap 331 and the connecting portion 321 of the flexible circuit board 32, thereby effectively improving the accuracy of electrical signal transmission.

[0162] In some embodiments of the present application, such as Figure 4 、 Figure 10 and Figure 11 As shown, the riveting cap 331 includes a cap body 3311 and a protruding portion 3312. The cap body 3311 abuts against a surface of the connecting portion 321 facing away from the electrical connecting piece 31. The protruding portion 3312 is connected to the cap body 3311 and is located on a side of the cap body 3311 facing the connecting portion 321. At least a part of the protruding portion 3312 extends into the opening and is connected to the copper foil.

[0163] For example, a part of the protruding portion 3312 extends into the opening and is connected to the copper foil; or, the entire protruding portion 3312 extends into the opening and is connected to the copper foil. In some specific examples, such as Figure 4 、 Figure 10 and Figure 11As shown, the cap body 3311 abuts against the upper side of the connecting portion 321. The upper end of the protruding portion 3312 is connected to the lower side surface of the cap body 3311, and the protruding portion 3312 protrudes towards the connecting portion 321. Further, a part of the protruding portion 3312 extends into the opening and is connected to the copper foil.

[0164] That is to say, when the flexible circuit board 32 and the electrical connection piece 31 are riveted together by the riveting member 33, the electrical signal can be sequentially transmitted to the electrical connection piece 31, the cap body 3311, the protruding portion 3312, and the connecting portion 321. The protrusion provided on the side of the cap body 3311 facing the connecting portion 321 can effectively reduce the risk of poor contact between the riveting member 33 and the copper foil of the connecting portion 321, thereby further improving the reliability of the electrical connection between the riveting member 33 and the connecting portion 321.

[0165] In the above technical solution, the protruding portion 3312 is connected to the cap body 3311 and is located on the side of the cap body 3311 facing the connecting portion 321, and at least part of the protruding portion 3312 extends into the opening and is connected to the copper foil, which can effectively reduce the risk of poor contact between the riveting member 33 and the copper foil of the connecting portion 321, thereby further improving the reliability of the long-term use of the battery device 100.

[0166] In some embodiments of the present application, as Figure 4 、 Figure 10 and Figure 11 shown, the end of the protruding portion 3312 facing away from the cap body 3311 is configured to be suitable for piercing the connecting portion 321, and the opening is formed by the protruding portion 3312 piercing the connecting portion 321.

[0167] In some specific examples, as Figure 4 、 Figure 10 and Figure 11 shown, when the connecting portion 321 of the flexible circuit board 32 and the electrical connection piece 31 are riveted together by the riveting member 33, the lower end of the protruding portion 3312 can pierce the connecting portion 321. That is to say, the protruding portion 3312 penetrates the connecting portion 321 from top to bottom and is directly connected to the copper foil.

[0168] Thereby, the possibility of poor contact between the protruding portion 3312 and the copper foil of the connecting portion 321 can be reduced, and thus the reliability of the connection between the protruding portion 3312 and the copper foil of the connecting portion 321 can be further improved. In addition, since the opening is formed by the protruding portion 3312 piercing the connecting portion 321, there is no need to pre-set an opening on the insulating layer on the upper side surface of the copper foil, thereby effectively reducing the pre-processing steps.

[0169] In the above technical solution, by piercing the connecting portion 321 with one end of the protruding portion 3312 facing away from the cap body 3311, and forming the opening by piercing the connecting portion 321 with the protruding portion 3312, not only can the reliability of the connection between the riveting member 33 and the connecting portion 321 be further improved, so that there is a tight mechanical connection and electrical connection between the riveting member 33 and the connecting portion 321, but also the processing flow of the connecting portion 321 can be simplified, thereby effectively improving the production efficiency.

[0170] In some embodiments of the present application, as Figure 4 and Figure 5 shown, in the direction from the cap body 3311 towards the deformation boss 333 (for example, Figure 5 the Z direction shown in

[0171] ), the protruding portion 3312 extends obliquely towards the riveting post 332. Figure 4 and Figure 5 shown, in the direction from top to bottom, the protruding portion 3312 extends obliquely towards the riveting post 332. When using the riveting member 33 to rivet the connecting portion 321 of the flexible circuit board 32 and the electrical connection piece 31 together, the lower end of the protruding portion 3312 pierces through the connecting portion 321 and abuts against the upper side surface of the electrical connection piece 31. After that, in the direction from top to bottom, since the protruding portion 3312 extends obliquely towards the riveting post 332, under the action of pressure, the lower end of the protruding portion 3312 will deform and move from the outside to the inside in the radial direction of the riveting cap 331, so that the protruding portion 3312 can play a stronger fixing role on the connecting portion 321. That is to say, the protruding portion 3312 first pierces through the connecting portion 321 to connect with the copper foil of the connecting portion 321, and then buckles inward under the action of pressure, thereby further strengthening the connection strength with the connecting portion 321.

[0172] In the above technical solution, in the direction from the cap body 3311 towards the deformation boss 333, by extending the protruding portion 3312 obliquely towards the riveting post 332, the fixing effect of the protruding portion 3312 on the connecting portion 321 can be further strengthened, so that the electrical connection piece 31 and the connecting portion 321 can maintain a stable connection even in a vibration or impact environment.

[0173] In some embodiments of the present application, as Figure 10 shown, the included angle between the protruding portion 3312 and the central axis of the riveting post 332 is greater than or equal to 5° and less than or equal to 10°.

[0174] For example, the included angle between the protruding portion 3312 and the central axis of the riveting post 332 can be 5°, 6°, 7°, 8°, 9°, and 10°. When the included angle between the protruding portion 3312 and the central axis of the riveting post 332 is less than 5°, the protruding portion 3312 will scratch the electrical connection piece 31 after piercing the connecting portion 321, or the protruding portion 3312 itself will be damaged due to excessive pressure, thus affecting the connection effect between the protruding portion 3312 and the connecting portion 321.

[0175] When the included angle between the protruding portion 3312 and the central axis of the riveting post 332 is greater than 10°, the protruding portion 3312 will be deformed and inwardly buckled in advance before piercing the connecting portion 321. That is to say, the protruding portion 3312 will be inwardly buckled before it pierces the connecting portion 321, resulting in poor contact between the protruding portion 3312 and the copper foil of the connecting portion 321, and further affecting the connection effect.

[0176] By setting the included angle between the protruding portion 3312 and the central axis of the riveting post 332 to be greater than or equal to 5° and less than or equal to 10°, the included angle can be within a reasonable range. Thus, it can not only reduce the possibility of damage to the protruding portion 3312 and the electrical connection piece 31, but also enable the protruding portion 3312 to first pierce the connecting portion 321 and then be deformed and inwardly buckled, thereby effectively improving the connection effect between the protruding portion 3312 and the connecting portion 321.

[0177] In the above technical solution, by setting the included angle between the protruding portion 3312 and the central axis of the riveting post 332 to be greater than or equal to 5° and less than or equal to 10°, it can not only effectively protect the protruding portion 3312 and the electrical connection piece 31, but also effectively guide the protruding portion 3312 to first pierce the connecting portion 321 and then be deformed and inwardly buckled, thereby effectively improving the connection effect between the protruding portion 3312 and the connecting portion 321.

[0178] It should be noted that the included angle between the protruding portion 3312 and the central axis of the riveting post 332 can be measured by measuring tools such as a coordinate measuring machine, an angle gauge, and a universal bevel protractor. Taking a coordinate measuring machine as an example below, the measurement method of the included angle between the protruding portion 3312 and the central axis of the riveting post 332 is described. First, the data points on the surface of the workpiece are obtained by using the probe contact or laser scanning method of the coordinate measuring machine, and then the geometric parameters such as the angle are calculated based on the data points.

[0179] In some embodiments of the present application, as Figure 10 shown, in the radial direction of the cap body 3311, the distance between the protruding portion 3312 and the outer radial edge of the cap body 3311 is the first spacing, and the distance between the outer radial edge and the inner radial edge of the cap body 3311 is the second spacing. Among them, the ratio of the first spacing to the second spacing is greater than or equal to 1 / 3 and less than or equal to 1 / 2.

[0180] For example Figure 10 As shown, the ratio of the first spacing L1 to the second spacing L2 can be 1 / 3, 7 / 20, 2 / 5, 9 / 20, and 1 / 2. That is to say, in the radial direction of the cap body 3311, the position of the convex portion 3312 relative to the cap body 3311 is not too close to the edge of the cap body 3311 nor too close to the center of the cap body 3311, but is in a reasonable position. Thus, it can effectively reduce the possibility of stress concentration at the edge of the cap body 3311 caused by the position of the convex portion 3312 being too close to the edge of the cap body 3311, and can also effectively reduce the possibility that the convex portion 3312 cannot completely pierce the connecting portion 321 due to the position of the convex portion 3312 being too close to the center of the cap body 3311.

[0181] In the above technical solution, by setting the ratio of the first spacing to the second spacing to be greater than or equal to 1 / 3 and less than or equal to 1 / 2, it can not only effectively reduce the possibility of stress concentration at the edge of the cap body 3311, thereby effectively reducing the risk of damage to the cap body 3311 and improving the durability of the cap body 3311, but also enable the convex portion 3312 to completely pierce the connecting portion 321, thereby improving the connection quality between the convex portion 3312 and the connecting portion 321.

[0182] It should be noted that the first spacing L1 and the second spacing L2 can be measured by measuring tools such as a coordinate measuring machine, a vernier caliper, and a micrometer. Taking a coordinate measuring machine as an example below, the measurement method of the first spacing L1 and the second spacing L2 is described. First, the data points on the surface of the workpiece are obtained by using the probe contact or laser scanning of the coordinate measuring machine, and then the geometric parameters such as angles are calculated based on the data points.

[0183] In some embodiments of the present application, as Figure 10 shown, in the direction from the cap body 3311 towards the deformation boss 333 (for example Figure 10 the Z direction shown in

[0184] ), the cross-sectional area of the convex portion 3312 gradually decreases. Figure 10 In some specific examples, as

[0185] Figure 10 shown, in the direction from top to bottom, the cross-sectional area of the convex portion 3312 gradually decreases. That is to say, the cross-sectional area of the upper end of the convex portion 3312 is large, the strength is high, and it is not easy to deform. The cross-sectional area of the lower end of the convex portion 3312 is small, the strength is low, and it is easy to deform and is easy to pierce the connecting portion 321.

[0185] In the above technical solution, in the direction from the cap body 3311 towards the deformation boss 333, the cross-sectional area of the protrusion 3312 gradually decreases, which can help the protrusion 3312 gradually pierce through the connecting part 321 during the riveting of the riveting part 33, and guide the protrusion 3312 to gradually deform and buckle inwards after the protrusion 3312 pierces through the connecting part 321, thus facilitating the riveting operation and effectively improving the riveting efficiency.

[0186] In some embodiments of the present application, as Figure 10 and Figure 11 shown, the protrusion 3312 is in the shape of a polygonal prism, or the protrusion 3312 is in the shape of a cone.

[0187] For example, the protrusion 3312 can be in the shape of a polygonal prism; or, the protrusion 3312 can be in the shape of a cone. In some specific examples, as Figure 10 and Figure 11 shown, the protrusion 3312 is in the shape of a cone. Further, the shape of the cross-section of the protrusion 3312 is a triangle.

[0188] In the above technical solution, by setting the protrusion 3312 as a polygonal prism or a cone, when the protrusion 3312 pierces through the connecting part 321, the stress exerted by the protrusion 3312 on the connecting part 321 can be effectively increased, thus facilitating the protrusion 3312 to pierce through the connecting part 321, and further the external force applied during the riveting process can be effectively reduced, improving the convenience of operation. In addition, it can also make the protrusion 3312 fit more closely to the opening edge, thereby further improving the sealing performance at the connection between the protrusion 3312 and the connecting part 321.

[0189] In some embodiments of the present application, as Figure 10 shown, in the axial direction of the riveting post 332, the height of the protrusion 3312 is greater than or equal to 0.5 mm and less than or equal to 1 mm.

[0190] For example Figure 10 shown, the height H of the protrusion 3312 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1 mm.

[0191] In the above technical solution, in the axial direction of the riveting post 332, by setting the height of the protrusion 3312 to be greater than or equal to 0.5 mm and less than or equal to 1 mm, not only does the protrusion 3312 have sufficient height dimensions, so that the protrusion 3312 can completely pierce through the connecting part 321, reducing the possibility of poor contact and effectively improving the reliability of the connection, but also the possibility of scratching the electrical connection piece 31 after the protrusion 3312 pierces through the connecting part 321 due to the excessive height dimension of the protrusion 3312 can be effectively reduced, thereby effectively protecting the electrical connection piece 31.

[0192] It should be noted that the height H of the convex portion 3312 can be measured by measuring tools such as a coordinate measuring machine, a vernier caliper, and a micrometer. Taking the coordinate measuring machine as an example, the measurement method of the height H of the convex portion 3312 is described below. First, the data points on the surface of the workpiece are obtained by using the probe contact or laser scanning of the coordinate measuring machine, and then the geometric parameters such as angles are calculated based on the data points.

[0193] In some embodiments of the present application, as Figure 11 shown, the minimum width of the cross-section of the end of the convex portion 3312 connected to the cap body 3311 is greater than or equal to 0.2 mm.

[0194] For example, the dimension of the cross-section width of the end of the convex portion 3312 connected to the cap body 3311 can be 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, and 0.3 mm.

[0195] In the above technical solution, by setting the minimum width of the cross-section of the end of the convex portion 3312 connected to the cap body 3311 to be greater than or equal to 0.2 mm, the connection strength at the connection between the convex portion 3312 and the cap body 3311 can be made sufficient, and the possibility of damage at the connection between the convex portion 3312 and the cap body 3311 can be reduced, thereby effectively improving the reliability and durability of the convex portion 3312.

[0196] In some embodiments of the present application, as Figure 11 shown, the end of the convex portion 3312 connected to the cap body 3311 extends along the circumferential direction of the cap body 3311, and in the circumferential direction of the cap body 3311, the length of one end of the convex portion 3312 is greater than or equal to 2 mm and less than or equal to 3 mm.

[0197] For example, in the circumferential direction of the cap body 3311, the length of one end of the convex portion 3312 can be 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, and 3 mm.

[0198] In the above technical solution, in the circumferential direction of the cap body 3311, setting the length of one end of the convex portion 3312 to be greater than or equal to 2 mm and less than or equal to 3 mm can enable the convex portion 3312 to have a sufficient contact area with the copper foil of the connecting portion 321 after piercing the connecting portion 321, thereby effectively reducing the contact resistance between the convex portion 3312 and the copper foil of the connecting portion 321, reducing the heat accumulation caused by the resistance, and further helping to maintain a stable temperature environment, thereby effectively improving the service life of the connection between the convex portion 3312 and the connecting portion 321.

[0199] In some embodiments of the present application, as Figure 10 and Figure 11As shown, the number of the convex portions 3312 is multiple, and the multiple convex portions 3312 are arranged at intervals along the circumferential direction of the cap body 3311.

[0200] For example, the number of the convex portions 3312 can be two, three, four, five or more than six. In some specific examples, the multiple convex portions 3312 are arranged at equal intervals along the circumferential direction of the cap body 3311.

[0201] In the above technical solution, by setting the number of the convex portions 3312 to be multiple and arranging the multiple convex portions 3312 at intervals along the circumferential direction of the cap body 3311, the copper foils of the convex portions 3312 and the connecting portion 321 can be in multi-point contact in the circumferential direction of the cap body 3311, reducing the possibility of poor contact or stress concentration caused by single-point contact, thereby further improving the reliability and stability of the connection between the convex portions 3312 and the connecting portion 321.

[0202] In some embodiments of the present application, as Figure 10 and Figure 11 shown, the number of the convex portions 3312 is greater than or equal to 3 and less than or equal to 5.

[0203] For example, the number of the convex portions 3312 can be three, four or five. In some specific examples, as Figure 10 and Figure 11 shown, the number of the convex portions 3312 is three. Further, the multiple convex portions are arranged at equal intervals along the circumferential direction of the cap body 3311, and the shapes and sizes of the multiple convex portions 3312 are the same.

[0204] In the above technical solution, by setting the number of the convex portions 3312 to be greater than or equal to 3 and less than or equal to 5, it can not only make the convex portions 3312 have good mechanical support and connection effects with the connecting portion 321, but also avoid excessive number of the convex portions 3312 resulting in waste of materials or complex processing, thereby effectively saving costs and effectively improving processing efficiency.

[0205] In some embodiments of the present application, the electrical connection piece 31 is an aluminum sheet.

[0206] It should be noted that the density of the aluminum material is small. Using the electrical connection piece 31 made of the aluminum material can effectively reduce the weight of the entire battery device 100. At the same time, the aluminum material also has reliable mechanical strength, so as to provide stable mechanical support, so that the electrical connection piece 31 can maintain a stable connection even in a vibration or impact environment. In addition, a dense oxide film is easily formed on the surface of aluminum, so that the electrical connection piece 31 has good corrosion resistance, improving the reliability of the long-term use of the electrical connection piece 31.

[0207] In the above technical solution, by setting the electrical connection piece 31 as an aluminum piece, the weight and production cost of the battery device 100 can be effectively reduced, and the strength and corrosion resistance of the connection piece can be effectively improved, thereby effectively improving the durability and service life of the electrical connection piece 31.

[0208] In some embodiments of the present application, the riveting piece 33 is integrally formed, and / or the riveting piece 33 is an aluminum material piece.

[0209] For example, the riveting piece 33 is integrally formed; or, the riveting piece 33 is an aluminum material piece; or, the riveting piece 33 is integrally formed and the riveting piece 33 is an aluminum material piece. In some specific examples, the riveting piece 33 is integrally formed and the riveting piece 33 is an aluminum material piece.

[0210] In the above technical solution, by setting the riveting piece 33 to be integrally formed, not only can the overall strength of the riveting piece 33 be effectively improved, thereby effectively improving the reliability of the connection between the electrical connection piece 31 and the connection portion 321, but also the assembly process can be effectively simplified, thereby effectively improving the production efficiency; by setting the riveting piece 33 as an aluminum material piece, the conductivity and corrosion resistance of the riveting piece 33 can be effectively improved, reducing the resistance loss and effectively protecting the connection portion, thereby effectively improving the efficiency of current transmission and the service life of the riveting piece 33.

[0211] In some embodiments of the present application, the flexible circuit board 32 includes a plurality of connection portions 321 arranged at intervals, the number of the electrical connection pieces 31 is multiple, and the multiple electrical connection pieces 31 are connected to the multiple connection portions 321 in one-to-one correspondence.

[0212] For example, the number of the multiple connection portions 321 arranged at intervals can be six, eight, ten, twelve, and fourteen or more, and each connection portion 321 is connected to the corresponding electrical connection piece 31. That is to say, a flexible circuit board 32 can be connected to the electrical connection piece 31 through a plurality of connection portions 321. Further, a dedicated pneumatic tooling can be used to perform riveting connections on multiple points simultaneously, thereby effectively improving the production efficiency.

[0213] In the above technical solution, by providing a plurality of connection portions 321 arranged at intervals on the flexible circuit board 32, and the number of the electrical connection pieces 31 is multiple, and the multiple electrical connection pieces 31 are connected to the multiple connection portions 321 in one-to-one correspondence, the flexible circuit board 32 can be provided with a plurality of electrical contact points, so that the distribution of the current is more uniform, thereby effectively reducing the risk of local overheating of the flexible circuit board 32. In addition, it can also make the battery device 100 have a reasonable redundancy design, thereby effectively improving the reliability of the battery device 100.

[0214] Second aspect, as Figure 1 shown, the embodiment of the present application further provides an electrical device 1, including the battery device 100 of any one of the above embodiments.

[0215] For example Figure 1 As shown, the electrical device 1 can be a vehicle. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. The vehicle is provided with a battery device 100, and the battery device 100 can be arranged at the bottom, the head, or the tail of the vehicle. The battery device 100 can be used for power supply of the vehicle. For example, the battery device 100 can be used as the operating power source of the vehicle.

[0216] The vehicle further includes 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, it is used for the working power requirements during the start, navigation, and driving of the vehicle. In some specific examples, the battery device 100 can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0217] In the above technical solution, by providing the battery device 100 in the first aspect above, and the connecting part 321 of the electrical connection piece 31 and the flexible circuit board 32 in the battery device 100 is riveted and connected by a riveting part 33, it can not only effectively improve the connection quality between the electrical connection piece 31 and the flexible circuit board 32, thereby effectively improving the reliability of the connection between the electrical connection piece 31 and the flexible circuit board 32, but also effectively simplify the connection process between the electrical connection piece 31 and the flexible circuit board 32, thereby effectively improving the work efficiency and effectively reducing the cost.

[0218] In the third aspect, the embodiment of the present application further provides a connection structure 30, including: an electrical connection piece 31 and a flexible circuit board 32. The electrical connection piece 31 is the electrical connection piece 31 in the battery device 100 in any one of the above embodiments, and the flexible circuit board 32 is the flexible circuit board 32 in the battery device 100 in any one of the above embodiments. The electrical connection piece 31 and the flexible circuit board 32 are riveted and connected by a riveting part 33.

[0219] In some specific examples, as Figure 4 shown, the flexible circuit board 32 has a connecting part 321, and the connecting part 321 is riveted and connected to the electrical connection piece 31 by a riveting part 33. Further, the connecting part 321 is integrally formed with the flexible circuit board 32 and extends towards the outside of the flexible circuit board 32. Both the electrical connection piece 31 and the connecting part 321 have sufficient mechanical strength to withstand the pressure during the riveting process, so that there is good electrical contact between the electrical connection piece 31 and the flexible circuit board 32. When the flexible circuit board 32 and the electrical connection piece 31 are riveted together by a riveting part 33, the electrical signal can be sequentially transmitted to the electrical connection piece 31, the riveting part 33, the flexible circuit board 32, and the battery management system, so as to realize the real-time monitoring and control of the state of the battery device 100.

[0220] In the above technical solution, the electrical connecting piece 31 and the flexible circuit board 32 are riveted together by the rivets 33, which can not only effectively improve the connection quality between the electrical connecting piece 31 and the flexible circuit board 32, thereby effectively improving the reliability of the connection between the electrical connecting piece 31 and the flexible circuit board 32, but also effectively simplify the process of connecting the electrical connecting piece 31 and the flexible circuit board 32, thereby effectively improving work efficiency and effectively reducing costs.

[0221] In the fourth aspect, the embodiment of the present application also provides a riveting method for a connection structure 30, wherein the connection structure 30 is the connection structure 30 of the above-mentioned embodiment, and the rivet member 33 includes a rivet column 333a, a rivet cap 331 and a rivet rod 334 before riveting, the rivet cap 331 is connected to one end of the rivet column 333a in the length direction, and extends in a ring shape along the circumference of the rivet column 333a, the rivet rod 334 is connected to the rivet column 333a and extends along the length direction of the rivet rod 334 toward the side where the rivet cap 331 is located, the riveting method includes: S1, passing the rivet column 333a of the rivet member 33 through the first through hole 310 on the electrical connection sheet 31 and the second through hole on the flexible circuit board 32 in sequence, wherein the electrical connection sheet 31 is located on the side of the flexible circuit board 32 away from the rivet cap 331.

[0222] For example Figure 3 As shown, the first through hole 310 of the electrical connection sheet 31 and the second through hole of the connecting portion 321 of the flexible circuit board 32 are first aligned in the up-down direction and the electrical connection sheet 31 is located at the lower side of the connecting portion 321 of the flexible circuit board 32. Then, the rivet column 333a of the rivet member 33 is sequentially passed through the first through hole 310 on the electrical connection sheet 31 and the second through hole of the connecting portion 321 of the flexible circuit board 32. That is, at this time, the rivet column 333a of the rivet member 33 is passed through the first through hole 310 on the electrical connection sheet 31 and the second through hole of the connecting portion 321 of the flexible circuit board 32, and the connecting portion 321 of the flexible circuit board 32 is located between the electrical connection sheet 31 and the rivet cap 331.

[0223] S2 , making the rivet cap 331 come into contact with the flexible circuit board 32 .

[0224] For example Figure 3As shown, after the rivet column 333a of the rivet member 33 passes through the first through hole 310 on the electrical connection sheet 31 and the second through hole of the connection portion 321 of the flexible circuit board 32 in sequence, the electrical connection sheet 31 and the connection portion 321 of the flexible circuit board 32 are adjusted so that the electrical connection sheet 31 and the flexible circuit board 32 abut against each other in the vertical direction, and then the position of the rivet rod 334 is adjusted so that the axis of the rivet rod 334 is perpendicular to the plane where the connection portion 321 of the electrical connection sheet 31 and the flexible circuit board 32 are located, and then the position of the rivet member 33 in the vertical direction is adjusted so that the rivet cap 331 abuts against the upper side of the connection portion 321 of the flexible circuit board 32. At this point, the preparation work before the riveting of the rivet member 33 is completed, so that the subsequent riveting work can be carried out smoothly.

[0225] S3 , pulling the rivet rod 334 to deform the rivet column 333 a located on the side of the electrical connection piece 31 away from the flexible circuit board 32 , so as to form a deformed boss 333 abutting against the side of the electrical connection piece 31 away from the flexible circuit board 32 .

[0226] In some specific examples, such as Figure 3 As shown, the lower end of the rivet rod 334 is connected to the rivet column 333a, and the rivet cap 331 is connected to the upper end of the rivet column 333a. Furthermore, the upper end of the rivet rod 334 may be provided with a clamping portion 3341, and the pneumatic tooling may pull the rivet rod 334 through the clamping portion 3341. When the rivet rod 334 is pulled, the rivet column 333a located at the lower side of the electrical connection sheet 31 is gradually deformed under the pulling of the rivet rod 334 and forms a deformation boss 333. The deformation boss 333 is formed at the lower side of the first through hole 310 of the electrical connection sheet 31 and abuts against the peripheral edge of the first through hole 310, thereby forming a reliable abutment surface between the deformation boss 333 and the electrical connection sheet 31. When the rivet rod 334 is pulled, the pneumatic tooling can make the rivet cap 331 firmly abut against the upper surface of the connecting portion 321 of the flexible circuit board 32, thereby, the rivet cap 331 and the deformation boss 333 can effectively fix the electrical connecting piece 31 and the connecting portion 321 of the flexible circuit board 32 in the up and down directions, and make the electrical connecting piece 31 and the connecting portion 321 of the flexible circuit board 32 tightly abut together in the up and down directions, thereby completing the mechanical and electrical connection between the electrical connecting piece 31 and the connecting portion 321 of the flexible circuit board 32.

[0227] S4, continue to pull the rivet rod 334 until the rivet rod 334 is broken.

[0228] It should be noted that a structurally weak area is provided at one end of the riveting rod 334 close to the riveting post 333a. In some specific examples, the structurally weak area is provided close to the lower end of the riveting rod 334, and the diameter dimension of the riveting rod 334 within the structurally weak area is smaller than the diameter dimensions of other parts of the riveting rod 334. That is to say, as the riveting rod 334 is continuously pulled, the riveting rod 334 within the structurally weak area gradually deforms and its diameter gradually decreases. When the riveting is completed, the riveting rod 334 within the structurally weak area breaks. At this time, the riveting rod 334 is pulled off, and the connecting portion 321 of the electrical connection piece 31 and the flexible circuit board 32 is riveted together. Thus, the riveting is completed.

[0229] In the above technical solution, by using the riveting method of the connecting structure 30 in the fourth aspect to rivet and connect the electrical connection piece 31 and the flexible circuit board 32 of the connecting structure 30 in the third aspect, not only can the connection quality between the electrical connection piece 31 and the flexible circuit board 32 be effectively improved, thereby effectively improving the reliability of the connection between the electrical connection piece 31 and the flexible circuit board 32, but also the connection process between the electrical connection piece 31 and the flexible circuit board 32 can be effectively simplified, thereby effectively improving the working efficiency and effectively reducing the cost.

[0230] In some embodiments of the present application, the riveting cap 331 includes a cap main body 3311 and a protruding portion 3312. The protruding portion 3312 is connected to the cap main body 3311 and is located on the side of the cap main body 3311 facing the connecting portion 321. The protruding portion 3312 is configured to be suitable for piercing the flexible circuit board 32. In step S3, after pulling the riveting rod 334, step S3 further includes: piercing the flexible circuit board 32 with the protruding portion 3312 and connecting to the copper foil within the flexible circuit board 32.

[0231] In some specific examples, as Figure 3 shown, the upper end of the protruding portion 3312 is connected to the lower side surface of the cap main body 3311. Further, the number of the protruding portions 3312 is three, and the multiple protruding portions 3312 extend along the circumferential direction of the cap main body 3311 and are evenly distributed at intervals.

[0232] In step S3, after pulling the riveting rod 334, the riveting post 333a gradually deforms under the pulling force of the riveting rod 334 and forms a deformed boss 333 that abuts against the periphery of the first through hole 310. While the riveting rod 334 is being pulled, the periphery of the cap main body 3311 abuts against the periphery of the second through hole and the protruding portion 3312 gradually pierces downward through the connecting portion 321 of the flexible circuit board 32. When the protruding portion 3312 pierces through the connecting portion 321, the protruding portion 3312 can be fixed and connected to the copper foil of the connecting portion 321, thereby realizing the mechanical and electrical connection between the protruding portion 3312 and the connecting portion 321.

[0233] That is to say, the protrusion 3312 penetrates the connecting portion 321 from top to bottom and is directly connected to the copper foil. Thus, the possibility of poor contact between the protrusion 3312 and the copper foil of the connecting portion 321 can be reduced, and the reliability of the connection between the protrusion 3312 and the copper foil of the connecting portion 321 can be further improved. In addition, since the protrusion 3312 pierces the connecting portion 321 to form an opening, there is no need to pre-set an opening in the insulating layer on the upper surface of the copper foil, thus effectively reducing the pre-processing steps.

[0234] In the above technical solution, after pulling the riveting rod 334 in step S3, the protrusion 3312 is set to pierce the flexible circuit board 32 and connect to the copper foil inside the flexible circuit board 32, which can not only further improve the connection effect between the riveting member 33 and the connecting portion 321, but also simplify the processing flow of the connecting portion 321, thereby effectively improving the production efficiency.

[0235] In some embodiments of the present application, the first through hole 310 on the electrical connection piece 31 is formed by stamping.

[0236] It should be noted that stamping is a commonly used metal processing technology. Under the action of pressure through a mold, the material undergoes plastic deformation to obtain the required shape and size.

[0237] In the above technical solution, forming the first through hole 310 on the electrical connection piece 31 by stamping can complete the processing of multiple first through holes 310 in a short time, thereby effectively improving the processing efficiency of the first through hole 310. In addition, the stamping process can also accurately control the size and position of the first through hole 310 and effectively reduce the possibility of defects caused by manual operation or other machining, thereby effectively improving the processing quality of the first through hole 310.

[0238] Next, reference will be made to Figures 2 - 11 Describe the battery device 100 according to a specific embodiment of the present application.

[0239] As Figures 2 - 5 shown, the battery device 100 includes a battery cell 10, a box body 20, and a connection structure 30.

[0240] As Figure 2 shown, the box body 20 includes a box main body 21 and a cover body 22. The box main body 21 is in the shape of a cuboid with an open top. The cover body 22 seals the top of the box main body 21. The periphery of the cover body 22 is fixedly connected to the periphery of the box main body 21 through fasteners. A plurality of battery cells 10 are stacked along the length direction of the box body 20 to form a battery cell 10 assembly, and a plurality of battery cell 10 assemblies are arranged in sequence along the width direction of the box body 20.

[0241] As Figures 3 - 5As shown, the connection structure 30 includes an electrical connection piece 31, a flexible circuit board 32, and a riveting piece 33.

[0242] As Figure 6 and Figure 7 shown, the electrical connection piece 31 is an aluminum piece. One end of the electrical connection piece 31 is provided with a first through hole 310 that penetrates the electrical connection piece 31 in the up and down direction. The first through hole 310 is a circular hole, and the first through hole 310 is formed by stamping. Further, the peripheral edge of the first through hole 310 is turned up to form a turned-riveting portion 311. The turned-riveting portion 311 includes an inclined section 3111 and a horizontal section 3112. In the direction from bottom to top, the inclined section 3111 extends along a straight line that is inclined towards the center of the first through hole 310, and the horizontal section 3112 extends along a straight line that is horizontally arranged towards the center of the first through hole 310. Moreover, the horizontal section 3112 is arranged on the upper side of the inclined section 3111, and the angle α between the inclined section 3111 and the central axis of the first through hole 310 is greater than or equal to 70° and less than or equal to 80°.

[0243] The flexible circuit board 32 includes a plurality of connection portions 321 arranged at intervals. A second through hole that penetrates the electrical connection piece 31 in the up and down direction is formed on the connection portion 321. The second through hole is a circular hole, and the connection portion 321 is integrally formed with the flexible circuit board 32 and extends towards the outside of the flexible circuit board 32. The number of the electrical connection pieces 31 is multiple, and the multiple electrical connection pieces 31 are connected to the multiple connection portions 321 in one-to-one correspondence. Further, the flexible circuit board 32 is connected to the battery management system.

[0244] As Figures 3 - 5 shown, after riveting, the riveting piece 33 includes a riveting cap 331, a riveting column 332, and a deformation boss 333. As Figure 10 and Figure 11 shown, before riveting, the riveting piece 33 includes a riveting post 333a, a riveting cap 331, and a riveting rod 334. Further, the riveting piece 33 is integrally formed and the riveting piece 33 is made of aluminum material.

[0245] As Figures 3 - 5 shown, the riveting cap 331 is located on the upper side of the connection portion 321, the deformation boss 333 is located on the lower side of the electrical connection piece 31. The upper end of the riveting column 332 is connected to the riveting cap 331, and the lower end of the riveting column 332 is connected to the deformation boss 333. The diameters of both the riveting cap 331 and the riveting column 332 are larger than the diameters of the first through hole 310 and the second through hole. Further, the deformation boss 333 firmly abuts against the lower peripheral edge of the first through hole 310, and the riveting cap 331 firmly abuts against the upper peripheral edge of the second through hole. As Figure 5 shown, the riveting cap 331 extends circumferentially along the riveting column 332 to form a ring shape. In the direction from the outside to the inside in the radial direction of the riveting cap 331, the riveting cap 331 extends along a straight line that is inclined away from the deformation boss 333.

[0246] As Figure 10 shown, the riveting cap 331 includes a cap body 3311 and a protruding portion 3312.

[0247] As Figure 10 shown, the entire lower surface of the cap body 3311 is formed as an inclined surface that extends obliquely. In the direction from the outside to the inside in the radial direction of the riveting column 332, the inclined surface extends upward obliquely, and the angle θ between the inclined surface and the central axis of the riveting column 332 is greater than or equal to 60°. Further, the inclined surface of the cap body 3311 facing the deformation boss 333 extends along the circumferential direction of the riveting column 332 and is arranged as an annular structure.

[0248] The upper end of the protruding portion 3312 is connected to the lower surface of the cap body 3311. In the direction from the cap body 3311 towards the deformation boss 333, the protruding portion 3312 extends obliquely towards the riveting column 332. Further, the angle between the protruding portion 3312 and the central axis of the riveting column 332 is greater than or equal to 5° and less than or equal to 10°. In the radial direction of the cap body 3311, the distance between the protruding portion 3312 and the outer edge of the cap body 3311 in the radial direction is the first spacing, and the distance between the outer edge and the inner edge of the cap body 3311 in the radial direction is the second spacing. The ratio of the first spacing to the second spacing is greater than or equal to 1 / 3 and less than or equal to 1 / 2.

[0249] As Figure 10 and Figure 11 shown, the number of the protruding portions 3312 is three, and the multiple protruding portions are arranged at equal intervals along the circumferential direction of the cap body 3311. In the direction from the cap body 3311 towards the deformation boss 333, the cross-sectional area of the protruding portion 3312 gradually decreases. Further, the shape of the protruding portion 3312 is a polygonal prism shape. One end of the protruding portion 3312 connected to the cap body 3311 extends along the circumferential direction of the cap body 3311, and in the circumferential direction of the cap body 3311, the length of one end of the protruding portion 3312 is greater than or equal to 2 mm and less than or equal to 3 mm. In the axial direction of the riveting column 332, the height of the protruding portion 3312 is greater than or equal to 0.5 mm and less than or equal to 1 mm. The minimum width of the cross-section of the end of the protruding portion 3312 connected to the cap body 3311 is greater than or equal to 0.2 mm.

[0250] When the pneumatic tooling is used to rivet the electrical connection sheet 31 and the connection portion 321 together, the rivet column 333a of the rivet member 33 is first passed through the first through hole 310 on the electrical connection sheet 31 and the second through hole on the flexible circuit board 32 in sequence, and then the position of the rivet member 33 is adjusted so that the rivet cap 331 abuts against the flexible circuit board 32, and then the rivet rod 334 is pulled by the pneumatic tooling to deform the rivet column 333a located on the side of the electrical connection sheet 31 away from the flexible circuit board 32 to form a deformed boss 333 abutting against the side of the electrical connection sheet 31 away from the flexible circuit board 32. While the rivet rod 334 is pulled, the peripheral edge of the cap body 3311 abuts against the peripheral edge of the second through hole and the protrusion 3312 gradually pierces downward through the connection portion 321 of the flexible circuit board 32. When the protrusion 3312 pierces the connection part 321 , the protrusion 3312 can be fixed and connected to the copper foil of the connection part 321 , thereby achieving mechanical and electrical connection between the protrusion 3312 and the connection part 321 .

[0251] Furthermore, a structural weak area is provided at one end of the rivet rod 334 near the rivet column 333a, and the diameter of the rivet rod 334 in the structural weak area is smaller than the diameter of other parts of the rivet rod 334. That is, as the rivet rod 334 is continuously pulled, the rivet rod 334 in the structural weak area gradually deforms and causes the diameter to gradually decrease. When the riveting is completed, the rivet rod 334 in the structural weak area breaks. At this time, the rivet rod 334 is pulled off, and the electrical connection piece 31 and the connection part 321 of the flexible circuit board 32 are riveted together, and the riveting is completed. Furthermore, when the electrical connection piece 31 and the connection part 321 are riveted together, a dedicated pneumatic tooling can be used to rivet multiple points at the same time, thereby effectively improving production efficiency.

[0252] The above-mentioned battery device 100 can not only effectively improve the connection quality between the electrical connecting piece 31 and the flexible circuit board 32, thereby effectively improving the reliability of the connection between the electrical connecting piece 31 and the flexible circuit board 32, but also effectively simplify the process of connecting the electrical connecting piece 31 and the flexible circuit board 32, thereby effectively improving work efficiency and effectively reducing costs.

[0253] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Battery cell (10); An electrical connection sheet (31), the electrical connection sheet (31) being electrically connected to the battery cell (10); A flexible circuit board (32), the flexible circuit board (32) having a connecting portion (321), the connecting portion (321) being riveted to the electrical connection sheet (31) via a rivet (33); The electrical connection sheet (31) is formed with a first through hole (310) penetrating the electrical connection sheet (31) along the thickness direction of the electrical connection sheet (31), and the connecting portion (321) is formed with a second through hole. The rivet member (33) comprises: a rivet cap (331), a rivet column (332) and a deformation boss (333); the rivet column (332) is inserted into the first through hole (310) and the second through hole; the rivet cap (331) and the deformation boss (333) are respectively connected to two ends of the rivet column (332); and the peripheral edge of the first through hole (310) and the peripheral edge of the second through hole abut between the rivet cap (331) and the deformation boss (333); At least a portion of a side surface of the rivet cap (331) facing the deformation boss (333) is formed as an inclined surface extending obliquely, and in a radial direction from the outside to the inside of the rivet column (332), the inclined surface extends obliquely away from the deformation boss (333).

2. The battery device according to claim 1, characterized in that: The periphery of the first through hole (310) is bent along the thickness direction of the electrical connection sheet (31) toward the side where the rivet cap (331) is located to form a riveted portion (311), and in the direction from the deformation boss (333) toward the rivet cap (331), at least a portion of the riveted portion (311) extends obliquely toward the center of the first through hole (310).

3. The battery device according to claim 2, characterized in that: The riveting portion (311) includes an inclined section (3111) extending in a ring shape along the circumference of the first through hole (310), and in the direction from the deformation boss (333) toward the rivet cap (331), the inclined section (3111) extends along a straight line arranged obliquely toward the center of the first through hole (310).

4. The battery device according to claim 3, characterized in that: The angle between the inclined section (3111) and the central axis of the first through hole (310) is greater than or equal to 70° and less than or equal to 80°.

5. The battery device according to claim 1, characterized in that: The angle between the inclined surface and the central axis of the riveting column (332) is greater than or equal to 60°.

6. The battery device according to claim 1, characterized in that: The inclined surface extends in a ring shape along the circumference of the riveting column (332).

7. The battery device according to claim 1, characterized in that: The rivet cap (331) extends in a ring shape along the circumference of the rivet column (332), and in a direction from the outside to the inside in the radial direction of the rivet cap (331), the rivet cap (331) extends along a straight line extending obliquely away from the deformation boss (333).

8. The battery device according to claim 1, characterized in that: The connecting portion (321) is arranged on a side of the electrical connecting sheet (31) facing the rivet cap (331), An opening is formed on one side of the connection portion (321) facing the rivet cap (331), the copper foil of the connection portion (321) is configured to be exposed at the opening position, and the rivet cap (331) is connected to the copper foil at the opening position.

9. The battery device according to claim 8, characterized in that: The rivet cap (331) comprises a cap body (3311) and a protruding portion (3312), wherein the cap body (3311) abuts against a surface of a side of the connecting portion (321) facing away from the electrical connecting sheet (31), and the protruding portion (3312) is connected to the cap body (3311) and is located on a side of the cap body (3311) facing the connecting portion (321), and at least a portion of the protruding portion (3312) extends into the opening and is connected to the copper foil.

10. The battery device according to claim 9, characterized in that: The end of the protrusion (3312) facing away from the cap body (3311) is configured to be suitable for piercing the connecting portion (321), and the opening is formed by the protrusion (3312) piercing the connecting portion (321).

11. The battery device according to claim 10, characterized in that: In the direction from the cap body (3311) toward the deformation boss (333), the protrusion (3312) extends obliquely toward the riveting column (332).

12. The battery device according to claim 11, characterized in that: The angle between the protrusion (3312) and the central axis of the riveting column (332) is greater than or equal to 5° and less than or equal to 10°.

13. The battery device according to claim 10, characterized in that: In the radial direction of the cap body (3311), the distance between the protrusion (3312) and the radial outer end edge of the cap body (3311) is a first spacing, and the distance between the radial outer end edge and the radial inner end edge of the cap body (3311) is a second spacing, wherein the ratio of the first spacing to the second spacing is greater than or equal to 1 / 3 and less than or equal to 1 / 2.

14. The battery device according to claim 10, characterized in that: In the direction from the cap body (3311) toward the deformation boss (333), the cross-sectional area of ​​the protrusion (3312) gradually decreases.

15. The battery device according to claim 14, characterized in that: The protrusion (3312) is in the shape of a polygonal prism, or the protrusion (3312) is in the shape of a cone.

16. The battery device according to claim 10, characterized in that: In the axial direction of the rivet column (332), the height of the protrusion (3312) is greater than or equal to 0.5 mm and less than or equal to 1 mm.

17. The battery device according to claim 10, characterized in that: The minimum width of the cross section of one end of the protrusion (3312) connected to the cap body (3311) is greater than or equal to 0.2 mm.

18. The battery device according to claim 10, characterized in that: One end of the protrusion (3312) connected to the cap body (3311) extends along the circumference of the cap body (3311), and in the circumference of the cap body (3311), the length of the one end of the protrusion (3312) is greater than or equal to 2 mm and less than or equal to 3 mm.

19. The battery device according to claim 9, characterized in that: The number of the protrusions (3312) is multiple, and the multiple protrusions (3312) are arranged at intervals along the circumference of the cap body (3311).

20. The battery device according to claim 19, characterized in that The number of the protrusions (3312) is greater than or equal to 3 and less than or equal to 5.

21. The battery device according to claim 1, characterized in that: The electrical connecting sheet (31) is an aluminum sheet.

22. The battery device according to claim 1, characterized in that The rivet (33) is integrally formed, and / or the rivet (33) is made of aluminum.

23. The battery device according to claim 1, characterized in that The flexible circuit board (32) comprises a plurality of connection parts (321) arranged at intervals, the number of the electrical connection sheets (31) is plural, and the plurality of electrical connection sheets (31) are connected to the plurality of connection parts (321) in a one-to-one correspondence.

24. An electrical device, characterized in that: A battery device (100) comprising any one of claims 1-22.

25. A connection structure, characterized in that: include: An electrical connection sheet (31) and a flexible circuit board (32), wherein the electrical connection sheet (31) is the electrical connection sheet (31) in the battery device (100) according to any one of claims 1 to 22, and the flexible circuit board (32) is the flexible circuit board (32) in the battery device (100) according to any one of claims 1 to 22, and the electrical connection sheet (31) and the flexible circuit board (32) are riveted together by a rivet (33).

26. A riveting method for a connection structure, wherein the connection structure (30) is the connection structure (30) according to claim 25, wherein the rivet member (33) comprises a rivet column (333a), a rivet cap (331) and a rivet rod (334) before riveting, wherein the rivet cap (331) is connected to one end of the rivet column (333a) in the length direction and extends in a ring shape along the circumference of the rivet column (333a), and the rivet rod (334) is connected to the rivet column (333a) and extends along the length direction of the rivet rod (334) toward the side where the rivet cap (331) is located, characterized in that: The riveting method comprises: S1, passing a rivet column (333a) of a rivet member (33) through a first through hole (310) on the electrical connection sheet (31) and a second through hole on the flexible circuit board (32) in sequence, wherein the electrical connection sheet (31) is located on a side of the flexible circuit board (32) facing away from the rivet cap (331); S2, making the rivet cap (331) abut against the flexible circuit board (32); S3, pulling the rivet rod (334) to deform the rivet column (333a) located on the side of the electrical connection sheet (31) facing away from the flexible circuit board (32) to form a deformed boss (333) abutting against the side of the electrical connection sheet (31) facing away from the flexible circuit board (32); S4, continue pulling the rivet rod (334) until the rivet rod (334) is broken.

27. The riveting method of the connection structure according to claim 26, characterized in that: The rivet cap (331) comprises a cap body (3311) and a protrusion (3312), wherein the protrusion (3312) is connected to the cap body (3311) and is located on a side of the cap body (3311) facing the connecting portion (321), and the protrusion (3312) is configured to pierce the flexible circuit board (32). In step S3, after the rivet rod (334) is pulled, step S3 further includes: causing the protrusion (3312) to pierce the flexible circuit board (32) and connect with the copper foil inside the flexible circuit board (32).

28. The riveting method of the connection structure according to claim 26, characterized in that: The first through hole (310) on the electrical connection sheet (31) is formed by stamping.

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