Battery device, power utilization device, connection structure and riveting method of connection structure

Abstract

The invention discloses a battery device, a power utilization device, a connecting structure and a riveting method of the connecting structure. The battery device comprises a battery monomer, a power supply device and a riveting device, the electric connecting sheets are electrically connected with the battery monomers; and the flexible circuit board is provided with a connecting part, and the connecting part is in riveted connection with the electric connecting sheet through a riveting piece. According to the technical scheme, the connecting part and the electric connecting piece are riveted together through the riveting piece, so that the connecting quality of the electric connecting piece and the flexible circuit board can be effectively improved, the connecting reliability of the electric connecting piece and the flexible circuit board is effectively improved, the connecting process of the electric connecting piece and the flexible circuit board can be effectively simplified, and the connecting efficiency of the electric connecting piece and the flexible circuit board is improved. Therefore, the working efficiency is effectively improved and the cost is effectively reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, 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 key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile 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 new energy power batteries collect flexible circuit boards, the flexible circuit boards are delivered to the PACK factory for assembly, and the assembly factory then processes them through internal equipment to connect the flexible circuit boards with the battery.

[0003] In the prior art, the connection between the flexible circuit board and the bar is usually made by laser welding or ultrasonic welding. When the flexible circuit board and the bar are connected by laser welding or ultrasonic welding, there are problems with the welding quality of the welding points, which affects the welding quality of the welding points. In addition, the use of welding technology leads to a complicated process flow for the overall processing, inconvenient assembly, and large hardware investment. Therefore, how to ensure the connection quality between the flexible circuit board and the bar and how to improve the assembly efficiency are technical problems that need to be solved urgently. Summary of the invention

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

[0005] In a first aspect, an embodiment of the present application provides a battery device, comprising: a battery cell; an electrical connection sheet electrically connected to the battery cell; and a flexible circuit board having a connection portion, the connection portion being riveted to the electrical connection sheet by a rivet.

[0006] In the above technical solution, a battery cell, an electrical connecting piece and a flexible circuit board are arranged in the battery device, the electrical connecting piece is electrically connected to the battery cell, the flexible circuit board has a connecting portion, and the connecting portion and the electrical connecting piece are riveted together by rivets. This 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.

[0007] In some embodiments of the present application, the electrical connecting sheet is formed with a first through hole that passes through the electrical connecting sheet along the thickness direction of the electrical connecting sheet, and a second through hole is formed on the connecting portion. The riveted part includes: a rivet cap, a rivet column and a deformation boss. The rivet column is passed through the first through hole and the second through hole, and the rivet cap and the deformation boss are respectively connected to the two ends of the rivet column. The peripheral edge of the first through hole and the peripheral edge of the second through hole abut between the rivet cap and the deformation boss.

[0008] In the above technical solution, the rivet column is inserted into the first through hole and the second through hole, the rivet cap and the deformation boss are respectively connected to the two ends of the rivet column, and the periphery of the first through hole and the periphery of the second through hole abut between the rivet cap and the deformation boss, so that the periphery of the first through hole and the second through hole are both subjected to the abutment force of the rivet, thereby effectively improving the reliability of the mechanical and electrical connection between the flexible circuit board and the electrical connecting sheet.

[0009] In some embodiments of the present application, the periphery of the first through hole is bent along the thickness direction of the electrical connecting sheet toward the side where the rivet cap is located to form a riveted portion, and in the direction from the deformation boss toward the rivet cap, at least a portion of the riveted portion extends obliquely toward the center of the first through hole.

[0010] In the above technical solution, by bending the periphery of the first through hole along the thickness direction of the electrical connection sheet toward the side where the rivet cap is located to form a riveted portion, and in the direction from the deformation boss toward the rivet cap, at least part of the riveted portion extends obliquely toward the center of the first through hole, the contact area between the electrical connection sheet and the connection 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 riveted portion can also effectively improve the structural strength of the periphery of the first through hole, thereby improving the connection quality.

[0011] In some embodiments of the present application, the riveted portion includes an annular inclined section extending along the circumference of the first through hole, and in the direction from the deformation boss toward the rivet cap, the inclined section extends along a straight line inclined toward the center of the first through hole.

[0012] In the above technical solution, in the direction from the deformation boss toward the rivet cap, the inclined section is extended along a straight line inclined toward the center of the first through hole, which can effectively reduce the processing difficulty of the riveted 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 riveted portion can undergo moderate elastic deformation under the riveting action of the riveting piece, so that the connecting portion of the electrical connecting piece and the flexible circuit board can fit tightly together, thereby effectively increasing the contact area and effectively improving the connection quality.

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

[0016] In the above technical solution, at least a portion of the side surface of the rivet cap facing the deformation boss is formed into an inclined surface that extends obliquely. In the radial direction from the outside to the inside of the rivet column, the inclined surface extends obliquely away from the deformation boss, so that the peripheral edge of the first through hole and the peripheral edge of the second through hole can be more closely abutted together, thereby controlling the relative movement distance between the connecting portion of the electrical connecting piece and the flexible circuit board to be within a reasonable range, thereby effectively improving the reliability of the connection between the connecting portion of the electrical connecting 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 riveted column to be greater than or equal to 60°, not only can the connecting part of the electrical connecting piece and the flexible circuit board be firmly connected together, but also the possibility of damage to the connecting part of the electrical connecting piece and the flexible circuit board caused by excessive abutment force borne by the periphery of the first through hole and the periphery of the second through hole can be effectively reduced. In other words, the reliability of the connection between the connecting part of the electrical connecting piece and the flexible circuit board can be effectively improved, and the connecting part of the electrical connecting piece and the flexible circuit board can be effectively protected.

[0019] In some embodiments of the present application, the inclined surface extends in a ring shape along the circumference of the riveting column.

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

[0021] In some embodiments of the present application, the rivet cap extends in a ring shape along the circumference of the rivet column, and in a direction from the radial outside to the inside of the rivet cap, the rivet 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 toward the deformation boss, by obliquely extending the protrusion toward the rivet column, the fixing effect of the protrusion on the connecting part can be further strengthened, so that the electrical connecting piece and the connecting part can maintain a stable connection even in a vibration or impact environment.

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

[0032] In the above technical solution, by setting the angle between the protrusion and the central axis of the rivet column to be greater than or equal to 5° and less than or equal to 10°, it is possible to effectively protect the protrusion and the electrical connection sheet, and to effectively guide the protrusion to first pierce the connection part and then deform and buckle inward, thereby effectively improving the connection effect between the protrusion and the connection part.

[0033] In some embodiments of the present application, in the radial direction of the cap body, the distance between the protrusion and the radial outer end edge of the cap body is a first spacing, and the distance between the radial outer end edge and the radial inner end edge of the cap body 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.

[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, not only can the possibility of stress concentration at the edge of the cap body be effectively reduced, thereby effectively reducing the risk of damage to the cap body and improving the durability of the cap body, but also the protrusion can completely pierce the connecting part, thereby improving the connection quality between the protrusion and the connecting part.

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

[0036] In the above technical solution, the cross-sectional area of ​​the protrusion gradually decreases in the direction from the cap body toward the deformation boss, which can help the protrusion gradually pierce the connecting part when the riveted part is riveted, and guide the protrusion to gradually deform and buckle inward after the protrusion pierces the connecting part, thereby facilitating the riveting operation and effectively improving the riveting efficiency.

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

[0038] In the above technical solution, by setting the raised portion in a polygonal prism or cone shape, the stress applied by the raised portion to the connection portion can be effectively increased when the raised portion pierces the connection portion, thereby facilitating the raised portion to pierce the connection portion, thereby effectively reducing the external force applied during the riveting process and improving the convenience of operation. In addition, the raised portion can be made to fit the edge of the opening more closely, thereby further improving the sealing of the connection between the raised portion and the connection portion.

[0039] In some embodiments of the present application, in the axial direction of the riveting column, the height of the protrusion 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 riveted column, by setting the height of the protrusion to be greater than or equal to 0.5 mm and less than or equal to 1 mm, not only the protrusion has a sufficient height dimension so that the protrusion can completely pierce the connecting part and reduce the possibility of poor contact, thereby effectively improving the reliability of the connection, but also the possibility of scratching the electrical connecting piece after the protrusion pierces the connecting part due to the excessive height dimension of the protrusion can be effectively reduced, thereby effectively protecting the electrical connecting piece.

[0041] In some embodiments of the present application, the minimum width of the cross section of one end of the protrusion 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 one end where the protrusion is connected to the cap body to be greater than or equal to 0.2 mm, the connection between the protrusion and the cap body can have sufficient connection strength, thereby reducing the possibility of damage to the connection between the protrusion and the cap body, thereby effectively improving the reliability and durability of the protrusion.

[0043] In some embodiments of the present application, one end of the protrusion connected to the cap body extends along the circumference of the cap body, and in the circumference of the cap body, the length of one end of the protrusion 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, the length of one end of the protrusion is greater than or equal to 2 mm and less than or equal to 3 mm, so that the protrusion can have sufficient contact area with the copper foil of the connecting part after piercing the connecting part, thereby effectively reducing the contact resistance between the protrusion and the copper foil of the connecting part, thereby reducing the heat accumulation caused by the resistance, and then helping to maintain a stable temperature environment, thereby effectively improving the service life of the connection between the protrusion and the connecting part.

[0045] In some embodiments of the present application, there are multiple protrusions, and the multiple protrusions are arranged at intervals along the circumference of the cap body.

[0046] In the above technical solution, by setting the number of protrusions to multiple, and arranging the multiple protrusions at intervals along the circumference of the cap body, the copper foil of the protrusions and the connecting part can contact at multiple points in the circumference of the cap body, thereby 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 protrusions and the connecting part.

[0047] In some embodiments of the present application, the number of protrusions 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 protrusions to be greater than or equal to 3 and less than or equal to 5, the protrusions and the connecting parts can have good mechanical support and connection effects, while the excessive number of protrusions will not lead to waste of materials or complicated processing, thereby effectively saving costs and effectively improving processing efficiency.

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

[0050] In the above technical solution, by setting the electrical connecting sheet 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 connecting sheet can be effectively improved, thereby effectively improving the durability and service life of the electrical connecting sheet.

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

[0052] In the above technical solution, by setting the rivet parts as one-piece molding, not only can the overall strength of the rivet parts be effectively improved, thereby effectively improving the reliability of the connection between the electrical connecting piece and the connecting part, but also the assembly process can be effectively simplified, thereby effectively improving production efficiency; by setting the rivet parts as aluminum parts, the conductivity and corrosion resistance of the rivet parts can be effectively improved, the resistance loss can be reduced and the connection can be effectively protected, thereby effectively improving the efficiency of current transmission and the service life of the rivet parts.

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

[0054] In the above technical solution, by providing a plurality of spaced connection parts on the flexible circuit board, and the number of electrical connection sheets is multiple, and the multiple electrical connection sheets are connected to the multiple connection parts one by one, the flexible circuit board can have multiple electrical contact points, so that the current distribution is more uniform, thereby effectively reducing the risk of local overheating of the flexible circuit board. In addition, the battery device can also have a reasonable redundant 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 rivet cap includes a cap body and a protrusion, the protrusion is connected to the cap body and is located on a side of the cap body facing the connecting portion, the protrusion is configured to be suitable for piercing the flexible circuit board, and in step S3, after pulling the rivet rod, step S3 also includes: making the protrusion pierce the flexible circuit board and connect with the copper foil in the flexible circuit board.

[0062] In the above technical solution, after the rivet rod is pulled in step S3, the protrusion is set to pierce the flexible circuit board and connect with the copper foil in the flexible circuit board, which can not only further improve the connection effect between the riveted part and the connecting part, but also simplify the processing flow of the connecting part, thereby effectively improving production efficiency.

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

[0064] In the above technical solution, the first through holes on the electrical connection sheet are formed by stamping, so that the processing of multiple first through holes can be completed in a short time, thereby effectively improving the processing efficiency of the first through holes. In addition, the stamping process can also accurately control the size and position of the first through holes, and effectively reduce the possibility of defects caused by manual operation or other mechanical processing, thereby effectively improving the processing quality of the first through holes.

[0065] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application; Figure 2 is an exploded view of a battery device according to an embodiment of the present application; Figure 3 is a structural schematic diagram of a connection structure in a riveting process according to an embodiment of the present application; Figure 4 is a structural schematic diagram of a connection structure according to an embodiment of the present application; Figure 5 is a cross-sectional view of a connection structure according to an embodiment of the present application; Figure 6 is a schematic structural diagram of an electrical connecting sheet according to an embodiment of the present application; Figure 7 yes Figure 6 A top view of the electrical connection sheet shown in ; Figure 8 yes Figure 6 A front view of the electrical connection piece shown in ; Fig. 9 yes Figure 6A left side view of the electrical connection sheet shown in ; Fig.10 is a schematic structural diagram of a riveted part before riveting according to an embodiment of the present application; Fig.11 yes Fig.10 Bottom view of the rivet shown in .

[0067] Reference numerals: 1. Electrical devices; 100. Battery device; 10. Battery cells; 20. Box body; 21. Box body; 22. Cover body; 30. Connection structure; 31. Electrical connection piece; 310, first through hole; 311, riveting portion; 3111, inclined section; 3112, horizontal section; 32. flexible circuit board; 321. connecting part; 33, rivet; 331, rivet cap; 3311, cap body; 3312, raised portion; 332, rivet column; 333, deformation boss; 333a, rivet column; 334, rivet rod; 3341, clamping portion; 200, controller; 300. Motor. DETAILED DESCRIPTION

[0068] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0070] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0071] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0072] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0073] In the description of the embodiments of the present application, the term "plurality" refers to more than two (including two).

[0074] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0075] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. 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 the specific circumstances.

[0076] The 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 may include one or more battery cells. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in mixed connection through a busbar component.

[0077] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0078] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0079] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0080] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0081] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0082] 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.

[0083] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0084] In some embodiments, the battery device refers to an energy storage device, which includes a box body, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0085] 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 or magnesium-ion batteries, etc., which are not limited in the embodiments of the present application. The battery cells may be cylindrical, flat, rectangular or other shapes, etc., which are not limited in the embodiments of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which are not limited in the embodiments of the present application.

[0086] Exemplarily, a battery cell may generally include a shell, a battery cell assembly and an electrolyte, wherein the shell is used to contain the battery cell assembly and the electrolyte, and the shell is provided with at least one positive electrode column and at least one negative electrode column. The battery cell assembly includes one or more electrode assemblies, and the electrode assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet and a separator.

[0087] Among them, the positive electrode plate can generally include a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode collector, the positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer, the positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode tab sheet, and multiple positive electrode tab sheets are stacked together and electrically connected to the positive electrode column.

[0088] The negative electrode sheet 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, the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab sheet, and multiple negative electrode tab sheets are stacked together and electrically connected to the negative electrode column. At the same time, the battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.

[0089] 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, electric vehicles, electric toys, electric tools and vehicles, etc.

[0090] In recent years, new energy vehicles have made great progress. In the field of electric vehicles, battery devices play an irreplaceable and important role as the power source of electric vehicles. In the assembly process of battery devices in electric vehicles, the connection quality between flexible circuit boards and the busbars is crucial to improving the reliability and performance of battery devices.

[0091] In the battery device of the related art, during the assembly process of the battery device, the connection between the flexible circuit board and the bar in the battery device is usually made by laser welding or ultrasonic welding. The welding process leads to thermal damage or cold welding at the welding point, which affects the welding quality, and the welding process is time-consuming and labor-intensive. In addition, when the laser welding process is used, a nickel sheet needs to be set between the flexible circuit board and the bar. One end of the nickel sheet is welded to the bar, and the other end of the nickel sheet is welded to the flexible circuit board by the reflow soldering process. The reflow soldering process is complicated and the nickel sheet cost is high. When the ultrasonic welding process is used, the welding point has high requirements, and anti-oxidation glue needs to be applied after welding. The connection process is complicated, which leads to low work efficiency.

[0092] Based on the above considerations, in order to improve the quality of the connection between the flexible circuit board and the bar piece and improve work efficiency, the present application designs a battery device, in which the flexible circuit board of the battery device has a connection portion, and the connection portion is riveted to the electrical connection piece by a rivet. The riveted connection is a mechanical connection method. Compared with the welding process, there is no problem that affects the welding quality, such as cold welding, at the connection point, and the riveted connection is not easily affected by the skill level of the operator or the performance of the welding equipment, so that the riveted connection can provide a reliable and consistent connection effect, thereby effectively improving the connection quality between the flexible circuit board and the bar piece. In addition, compared with the welding process, the riveted connection process is simple, easy to operate, and does not require the use of nickel sheets, which can effectively simplify the connection process between the flexible circuit board and the bar piece, reduce the difficulty of assembly, and effectively improve work efficiency.

[0093] The embodiment of the present application provides an electric device using the battery device of the present disclosure as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console and an electric car toy, etc.

[0094] For the convenience of explanation, the following embodiments take the electric device as a vehicle as an example to introduce the structures of the electric device and the battery device of the present application in detail.

[0095] Please refer to Figure 1 , Figure 1 The power-consuming device provided for some embodiments of the present application is a structural schematic diagram of a vehicle. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle is provided with a battery device, and the battery device may be arranged at the bottom, head or tail of the vehicle. The battery device can be used to power the vehicle, for example, the battery device can be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller is used to control the battery device to power the motor, for example, for the working power requirements of the vehicle during starting, navigation and driving. In some embodiments of the present application, the battery device can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0096] Please refer to Figure 2 , Figure 2 An exploded view of a battery device provided in some embodiments of the present application. The battery device comprises a box body and a plurality of battery cells, wherein 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 a structural schematic diagram of a connection structure in a riveting process according to an embodiment of the present application; Figure 4 is a structural schematic diagram of a connection structure according to an embodiment of the present application; Figure 5 is a cross-sectional view of a connection structure according to an embodiment of the present application; Figure 6 is a schematic structural diagram of an electrical connecting sheet according to an embodiment of the present application; Figure 7 yes Figure 6 A top view of the electrical connection sheet shown in ; Figure 8 yes Figure 6 A front view of the electrical connection piece shown in ; Fig. 9 yes Figure 6 A left side view of the electrical connection sheet shown in ; Fig.10 is a schematic structural diagram of a riveted part before riveting according to an embodiment of the present application; Fig.11 yes Fig.10 Bottom view of the rivet shown in .

[0097] Reference below Figure 2-Figure 11 A battery device 100 according to an embodiment of the first aspect of the present application is described.

[0098] The present application embodiment provides a battery device 100, such as Figure 2-Figure 5 As shown, the battery device 100 includes: a battery cell 10, an electrical connection sheet 31 and a flexible circuit board 32. The electrical connection sheet 31 is electrically connected to the battery cell 10; the flexible circuit board 32 has a connection portion 321, and the connection portion 321 is riveted to the electrical connection sheet 31 through a rivet 33.

[0099] It should be noted that multiple battery cells 10 are connected in series or in parallel through electrical connecting sheets 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 real-time monitoring and control of the state of the battery device 100, including the collection and transmission of parameters such as voltage, current, and temperature, so as to timely detect abnormal conditions of the battery device 100 and perform corresponding protection and management.

[0100] In some specific examples, such as Figure 3-Figure 5 As shown, the electrical connection sheet 31 is electrically connected to the battery cell 10, and the connection portion 321 of the flexible circuit board 32 is connected to the electrical connection sheet 31. Furthermore, the connection portion 321 is integrally formed with the flexible circuit board 32 and extends toward the outside of the flexible circuit board 32. Both the electrical connection sheet 31 and the connection portion 321 have sufficient mechanical strength to withstand the pressure during the riveting process, thereby ensuring good electrical contact between the electrical connection sheet 31 and the flexible circuit board 32. When the flexible circuit board 32 and the electrical connection sheet 31 are riveted together by the rivet 33, electrical signals can be transmitted to the electrical connection sheet 31, the rivet 33, the flexible circuit board 32 and the battery management system in sequence, thereby achieving real-time monitoring and control of the state of the battery device 100.

[0101] It should be noted that in the prior art, during the assembly of the battery device 100, the connection between the flexible circuit board 32 in the battery device 100 and the bar piece is usually made by laser welding or ultrasonic welding. The welding process results in thermal damage or cold welding at the welding point, which affects the welding quality, and the welding process is time-consuming and labor-intensive. In addition, when the laser welding process is used, a nickel sheet is usually required to be arranged between the flexible circuit board 32 and the bar piece. One end of the nickel sheet is welded to the bar piece, and the other end of the nickel sheet is welded to the flexible circuit board 32 by the reflow soldering process. The reflow soldering process is complicated and the nickel sheet cost is relatively high. When the ultrasonic welding process is used, the welding point has higher requirements, and anti-oxidation glue needs to be applied after welding. The connection process is complicated, which leads to low work efficiency.

[0102] In this embodiment, a connecting portion 321 is provided on the flexible circuit board 32, and the connecting portion 321 is riveted to the electrical connecting piece 31 through a rivet 33. The riveted connection, as a mechanical connection method, can achieve a strong connection between the flexible circuit board 32 and the electrical connecting piece 31 without using high temperature, and there is no problem of thermal damage or cold welding that may occur during the welding process, thereby effectively improving the connection quality between the flexible circuit board 32 and the electrical connecting piece 31, and then effectively improving the reliability of the connection between the flexible circuit board 32 and the electrical connecting piece 31. In addition, the riveted connection is not easily affected by the operator's skill level or the performance of the welding equipment, thereby effectively improving the consistency of the connection effect between the flexible circuit board 32 and the electrical connecting piece 31.

[0103] In addition, compared with the welding process, the riveting connection process is simple and easy to operate, which can effectively simplify the connection process between the flexible circuit board 32 and the bar, reduce the difficulty of assembly, and thus effectively improve work efficiency. The riveting connection does not require the use of a nickel sheet to transitionally connect the electrical connection plate 31, which can effectively reduce costs.

[0104] In the above technical solution, by arranging a battery cell 10, an electrical connecting piece 31 and a flexible circuit board 32 in the battery device 100, the electrical connecting piece 31 is electrically connected to the battery cell 10, and the flexible circuit board 32 has a connecting portion 321, and the connecting portion 321 is riveted to the electrical connecting piece 31 through a rivet 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.

[0105] In some embodiments of the present application, Figure 4-Figure 9 As shown, the electrical connection sheet 31 is formed with a plurality of holes along the thickness direction of the electrical connection sheet 31 (eg Figure 6A first through hole 310 (in the Z direction shown in FIG. 1 ) penetrates the electrical connecting sheet 31, a second through hole is formed on the connecting portion 321, and the rivet member 33 includes: a rivet cap 331, a rivet column 332 and a deformation boss 333. The rivet column 332 is penetrated through the first through hole 310 and the second through hole, the rivet cap 331 and the deformation boss 333 are respectively connected to the two ends of the rivet column 332, and the periphery of the first through hole 310 and the periphery of the second through hole abuts between the rivet cap 331 and the deformation boss 333.

[0106] In some specific examples, such as Figure 6 and Figure 7 As shown, the thickness direction of the electrical connection sheet 31 is the Z direction, and the Z direction is the up-down direction. One end of the electrical connection sheet 31 is provided with a first through hole 310 that passes through the electrical connection sheet 31 along the up-down direction, and a second through hole that passes through the electrical connection sheet 31 along the up-down direction is formed on the connecting portion 321. Furthermore, the first through hole 310 and the second through hole are both circular holes, thereby enabling the stress distribution around the first through hole 310 and the second through hole to be uniform, effectively reducing the possibility of damage due to stress concentration.

[0107] For example Figure 4 and Figure 5 As shown, when the rivet 33 rivets the flexible circuit board 32 and the electrical connection sheet 31 together, the rivet column 332 of the rivet 33 is inserted into the first through hole 310 and the second through hole, and the rivet column 332 of the rivet 33 is arranged between the rivet cap 331 and the deformation boss 333. Further, the upper end of the rivet column 332 is connected to the rivet cap 331, and the lower end of the rivet column 332 is connected to the deformation boss 333. The diameters of the rivet cap 331 and the rivet column 332 are both 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 sheet 31 are located between the rivet 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 sheet 31.

[0108] Under the riveting action of the rivet 33, the rivet column 332 can apply a pulling force to the deformed boss 333 toward the electrical connection sheet 31, so that the deformed boss 333 can firmly abut against the lower peripheral edge of the first through hole 310, and the rivet column 332 can apply a pulling force to the rivet cap 331 toward the connecting portion 321 of the flexible circuit board 32, so that the rivet cap 331 can firmly abut against the upper peripheral edge of the second through hole.

[0109] That is to say, the deformation boss 333 can apply an upward abutting force to the lower peripheral edge of the first through hole 310, and the rivet cap 331 can apply a downward abutting force to the upper peripheral edge of the second through hole. Thus, the rivet 33 can firmly abut the connecting portion 321 of the flexible circuit board 32 and the electrical connecting piece 31 between the deformation boss 333 and the rivet cap 331, thereby effectively realizing a firm mechanical and electrical connection between the flexible circuit board 32 and the electrical connecting piece 31.

[0110] In the above technical solution, 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 the two ends of the rivet column 332, and the periphery of the first through hole 310 and the periphery of the second through hole abut between the rivet cap 331 and the deformation boss 333, so that the periphery of the first through hole 310 and the second through hole are both subjected to the abutment force of the rivet 33, thereby effectively improving the reliability of the mechanical and electrical connection between the flexible circuit board 32 and the electrical connecting sheet 31.

[0111] In some embodiments of the present application, Figure 5-Figure 9 As shown, the periphery of the first through hole 310 is along the thickness direction of the electrical connection sheet 31 (for example Figure 5 The rivet cap 331 is bent toward the side where the rivet cap 331 is located to form a riveted portion 311. Figure 5 In the Z direction (as shown in FIG), at least a portion of the riveted portion 311 extends obliquely toward the center of the first through hole 310.

[0112] For example, a portion of the riveted portion 311 extends obliquely toward the center of the first through hole 310; or in another example, the entire riveted portion 311 extends obliquely toward the center of the first through hole 310. Figure 5 As shown, the rivet cap 331 is arranged on the upper side of one end of the electrical connecting piece 31 where the first through hole 310 is arranged, and the peripheral edge of the first through hole 310 is folded upward to form a riveted portion 311. In the direction from bottom to top, a part of the riveted portion 311 extends obliquely toward the center of the first through hole 310, and another part of the riveted portion 311 extends horizontally toward the center of the first through hole 310.

[0113] In the above technical solution, the circumference 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 part of the riveted portion 311 extends obliquely toward the center of the first through hole 310, which can effectively increase the contact area between the electrical connection sheet 31 and the connection portion 321 of the flexible circuit board 32, 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 riveted portion 311 can also effectively improve the structural strength of the circumference of the first through hole 310, thereby improving the connection quality.

[0114] In some embodiments of the present application, Figure 5-Figure 9 As shown, 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 a direction from the deformation boss 333 toward the riveting cap 331 (for example Figure 5 In the Z direction (as shown in FIG), the inclined section 3111 extends along a straight line that is arranged obliquely toward the center of the first through hole 310.

[0115] In some specific examples, the riveted portion 311 includes an inclined section 3111 and a horizontal section 3112 extending in a ring shape along the circumference of the first through hole 310. In the direction from bottom to top, the inclined section 3111 extends along a straight line arranged obliquely toward the center of the first through hole 310, and the horizontal section 3112 extends along a straight line arranged horizontally 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.

[0116] In the above technical solution, extending the inclined section 3111 along a straight line inclined toward the center of the first through hole 310 in the direction from the deformation boss 333 toward the rivet cap 331 can effectively reduce the processing difficulty of the riveted portion 311, thereby effectively improving the processing efficiency.

[0117] In some embodiments of the present application, Figure 5-Figure 9 As shown, 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°.

[0118] For example Figure 5 As shown, the angle α between the inclined section 3111 and the central axis of the first through hole 310 may be 70°, 72°, 74°, 76°, 78° and 80°.

[0119] In the above technical solution, by setting the 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 riveted portion 311 can undergo moderate elastic deformation under the riveting action of the rivet 33, so that the electrical connecting piece 31 and the connecting portion 321 of the flexible circuit board 32 can fit tightly together, thereby effectively increasing the contact area and effectively improving the connection quality.

[0120] It should be noted that the 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 angle ruler. The following describes a method for measuring the angle α between the inclined section 3111 and the central axis of the first through hole 310 by taking a coordinate measuring machine as an example. First, data points on the workpiece surface are obtained by using a probe contact or laser scanning method of a coordinate measuring machine, and then geometric parameters such as angles are calculated based on the data points.

[0121] In some embodiments of the present application, Figure 5 As shown, at least a portion of a side surface of the rivet cap 331 facing the deformable boss 333 is formed as an inclined surface extending obliquely, in a radial direction from the outside to the inside of the rivet column 332 (for example, Figure 5 In the Z direction (as shown in FIG), the inclined surface extends obliquely away from the deformation boss 333.

[0122] For example, a portion of the side surface of the rivet cap 331 facing the deformation boss 333 is formed as an inclined surface extending obliquely; in another example, the entire side surface of the rivet cap 331 facing the deformation boss 333 is formed as an inclined surface extending obliquely. Figure 5 As shown, the entire lower surface of the rivet cap 331 is formed as an inclined surface extending obliquely, that is, there is an angle between the inclined surface extending obliquely formed by the lower surface of the rivet cap 331 and a plane perpendicular to the central axis of the rivet column 332. Figure 5 As shown, in the direction from the outside to the inside of the radial direction of the rivet column 332 , the inclined surface extends upwardly obliquely, that is, the inclined surface gradually rises from the outside to the inside of the rivet cap 331 .

[0123] Therefore, when the connecting portion 321 of the flexible circuit board 32 and the electrical connecting piece 31 are riveted together by the rivet 33, the area of ​​the abutting surface of the rivet cap 331 can be effectively reduced, thereby effectively increasing the stress of the abutting surface of the rivet cap 331, and further enabling the outer edge of the rivet cap 331 and the deformation boss 333 to abut the periphery of the first through hole 310 and the periphery of the second through hole more tightly together.

[0124] In the above technical solution, at least a portion of the side surface of the rivet cap 331 facing the deformation boss 333 is formed into an inclined surface that extends obliquely. In the radial direction from the outside to the inside of the rivet column 332, the inclined surface extends obliquely away from the deformation boss 333, so that the peripheral edge of the first through hole 310 and the peripheral edge of the second through hole can be more closely abutted together, thereby controlling the relative movement distance between the electrical connection piece 31 and the connection portion 321 of the flexible circuit board 32 to be within a reasonable range, thereby effectively improving the reliability of the connection between the electrical connection piece 31 and the connection portion 321 of the flexible circuit board 32.

[0125] In some embodiments of the present application, Figure 5 As shown, the angle between the inclined surface and the central axis of the riveting column 332 is greater than or equal to 60°.

[0126] For example, the angle θ between the inclined surface and the central axis of the riveting column 332 may be 60°, 62°, 64°, 66°, 68°, and 70°. In some specific examples, the angle θ between the inclined surface and the central axis of the riveting column 332 is smaller than the angle α between the inclined section 3111 of the riveted portion 311 and the central axis of the first through hole 310.

[0127] In the above technical solution, by setting the angle between the inclined surface and the central axis of the rivet column 332 to be greater than or equal to 60°, not only can the electrical connection piece 31 and the connecting portion 321 of 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 abutment force borne by the periphery of the first through hole 310 and the periphery of the second through hole can be effectively reduced. In other words, the reliability of the connection between the connecting portion 321 of the electrical connection piece 31 and the flexible circuit board 32 can be effectively improved, and the connecting portion 321 of the electrical connection piece 31 and the flexible circuit board 32 can be effectively protected.

[0128] It should be noted that the angle θ between the inclined surface and the central axis of the riveted column 332 can be measured by measuring tools such as a coordinate measuring machine, an angle gauge, and a universal angle ruler. The following describes a method for measuring the angle θ between the inclined surface and the central axis of the riveted column 332 by taking a coordinate measuring machine as an example. First, data points on the workpiece surface are obtained by using a probe contact or laser scanning method of a coordinate measuring machine, and then geometric parameters such as angles are calculated based on the data points.

[0129] In some embodiments of the present application, Figure 5 As shown, the inclined surface extends in a ring shape along the circumference of the rivet column 332 .

[0130] In some specific examples, such as Figure 5As shown, the inclined surface of the rivet cap 331 facing the deformation boss 333 is arranged as an annular structure along the circumference of the rivet column 332 , that is, the inclined surface is a continuous annular structure. Further, the inclined surface is evenly distributed in the circumference of the rivet column 332 .

[0131] When the connection portion 321 of the flexible circuit board 32 is riveted together with the electrical connection sheet 31 by the rivet 33, the lower peripheral edge of the annular inclined surface extending along the circumference of the rivet column 332 can evenly fit the peripheral edge of the first through hole 310 and the peripheral edge of the second through hole, that is, the lower peripheral edge of the inclined surface 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 annular inclined surface extending along the circumference of the rivet column 332 forms a closed space inside the rivet cap 331, thereby effectively reducing the risk of air or other contaminants entering the internal space of the rivet cap 331.

[0132] In the above technical solution, by extending the inclined surface into a ring shape along the circumference of the rivet column 332, not only can the pressure applied by the rivet cap 331 be evenly distributed on the connecting portion 321 of the electrical connecting piece 31 and the flexible circuit board 32, thereby reducing the possibility of damage due to stress concentration, but also the sealing performance of the rivet cap 331 can be effectively improved, protecting the connection between the electrical connecting piece 31 and the connecting portion 321 of the flexible circuit board 32 from damage, thereby effectively improving the reliability and durability of the connection.

[0133] In some embodiments of the present application, Figure 4 and Figure 5 As shown, the rivet cap 331 extends in a ring shape along the circumference of the rivet column 332 , and in the direction from the radial outside to the inside of the rivet cap 331 , the rivet cap 331 extends along a straight line that extends obliquely away from the deformation boss 333 .

[0134] In some specific examples, such as Figure 4 and Figure 5 As shown, the rivet cap 331 extends along the circumference of the rivet column 332 to form an annular structure. Furthermore, the rivet cap 331 is evenly distributed along the circumference of the rivet column 332. Figure 5 As shown, in the radial direction from the outside to the inside of the rivet cap 331, the rivet cap 331 gradually rises along a straight line to form a structure similar to a frustum.

[0135] As a result, the external force on the rivet cap 331 can be evenly distributed on the rivet cap 331, reducing the possibility of damage caused by excessive local stress on the rivet cap 331, thereby effectively reducing the possibility of loosening between the electrical connection sheet 31 and the connecting portion 321 of the flexible circuit board 32. In addition, the structural structure of the rivet cap 331 can be effectively simplified, which is convenient for the processing and manufacturing of the rivet cap 331, thereby effectively improving the processing efficiency of the rivet 33.

[0136] In the above technical solution, by extending the rivet cap 331 into a ring shape along the circumference of the rivet column 332, the rivet cap 331 extends along a straight line extending obliquely away from the deformation boss 333 in the radial direction from the outside to the inside of the rivet cap 331, which can effectively optimize the distribution of stress on the rivet cap 331 and reduce the possibility of local stress concentration, thereby effectively improving the fatigue resistance of the rivet cap 331, and further effectively improving the service life of the rivet cap 331 and the stability of the connection. In addition, the processing efficiency of the rivet 33 can also be effectively improved.

[0137] In some embodiments of the present application, Figure 3-Figure 5 As shown, the connection part 321 is arranged on the side of the electrical connection sheet 31 facing the rivet cap 331, an opening is formed on the side of the connection part 321 facing the rivet cap 331, the copper foil of the connection part 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.

[0138] In some specific examples, such as Figure 3-Figure 5 As shown, the connection portion 321 of the flexible circuit board 32 is arranged on the upper side of the electrical connection sheet 31, that is, the connection portion 321 of the flexible circuit board 32 is arranged between the electrical connection sheet 31 and the rivet cap 331. Further, the connection portion 321 of the flexible circuit board 32 is composed of a copper foil and an insulating layer covering the upper and lower surfaces of the copper foil, wherein the insulating layer located on the upper side surface of the copper foil is formed with an opening, so that the copper foil of the connection portion 321 of the flexible circuit board 32 is exposed at the opening position.

[0139] When the connecting portion 321 of the flexible circuit board 32 and the electrical connecting sheet 31 are riveted together by the rivet 33, the rivet cap 331 can abut against the periphery of the second through hole and the rivet cap 331 can contact the copper foil at the opening position, that is, the rivet cap 331 is directly connected to the copper foil of the connecting portion 321 at the opening position without any other intermediate medium, thereby forming a reliable current transmission path and improving the current transmission efficiency.

[0140] In the above technical solution, an opening is formed on the side of the connecting portion 321 facing the rivet cap 331, and the copper foil of the connecting portion 321 is configured to be exposed at the opening position. The rivet cap 331 is connected to the copper foil at the opening position, so that a reliable electrical connection can be formed between the rivet cap 331 and the connecting portion 321 of the flexible circuit board 32, thereby effectively improving the accuracy of electrical signal transmission.

[0141] In some embodiments of the present application, Figure 4 , Fig.10 and Fig.11 As shown, the riveted cap 331 includes a cap body 3311 and a protrusion 3312. The cap body 3311 abuts against a surface of the connecting portion 321 that is away from the electrical connecting sheet 31. The protrusion 3312 is connected to the cap body 3311 and is located on the side of the cap body 3311 that faces the connecting portion 321. At least a portion of the protrusion 3312 extends into the opening and is connected to the copper foil.

[0142] For example, a portion of the protrusion 3312 extends into the opening and is connected to the copper foil; in another example, the entire protrusion 3312 extends into the opening and is connected to the copper foil. Figure 4 , Fig.10 and Fig.11 As shown, the cap body 3311 abuts against the upper side of the connecting portion 321, the upper end of the protrusion 3312 is connected to the lower side of the cap body 3311 and the protrusion 3312 is protruded toward the connecting portion 321, and further, a part of the protrusion 3312 extends into the opening and is connected to the copper foil.

[0143] That is to say, when the flexible circuit board 32 and the electrical connection piece 31 are riveted together by the rivet 33, the electrical signal can be transmitted to the electrical connection piece 31, the cap body 3311, the protrusion 3312 and the connecting part 321 in sequence, and the protrusion arranged on the side of the cap body 3311 facing the connecting part 321 can effectively reduce the risk of poor contact between the rivet 33 and the copper foil of the connecting part 321, thereby further improving the reliability of the electrical connection between the rivet 33 and the connecting part 321.

[0144] In the above technical solution, the protrusion 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 a portion of the protrusion 3312 extends into the opening and is connected to the copper foil, which can effectively reduce the risk of poor contact between the rivet 33 and the copper foil of the connecting portion 321, thereby further improving the reliability of the battery device 100 in long-term use.

[0145] In some embodiments of the present application, Figure 4 , Fig.10 and Fig.11As shown, one end of the protrusion 3312 which faces 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 .

[0146] In some specific examples, such as Figure 4 , Fig.10 and Fig.11 As shown, when the connection part 321 of the flexible circuit board 32 and the electrical connection sheet 31 are riveted together using the rivet 33, the lower end of the protrusion 3312 can pierce the connection part 321. In other words, the protrusion 3312 penetrates the connection part 321 from top to bottom and is directly connected to the copper foil.

[0147] Thus, the possibility of poor contact between the protrusion 3312 and the copper foil of the connection part 321 can be reduced, thereby further improving the reliability of the connection between the protrusion 3312 and the copper foil of the connection part 321. In addition, since the protrusion 3312 pierces the connection part 321 to form an opening, it is not necessary to pre-set an opening on the insulating layer on the upper surface of the copper foil, thereby effectively reducing the pre-processing steps.

[0148] In the above technical solution, by piercing the connecting part 321 with the end of the protrusion 3312 facing away from the cap body 3311, the opening is formed by the protrusion 3312 piercing the connecting part 321, which can not only further improve the reliability of the connection between the rivet 33 and the connecting part 321, so that there is a tight mechanical connection and electrical connection between the rivet 33 and the connecting part 321, but also simplify the processing flow of the connecting part 321, thereby effectively improving the production efficiency.

[0149] In some embodiments of the present application, Figure 4 and Figure 5 As shown, in the direction from the cap body 3311 toward the deformation boss 333 (for example Figure 5 In the Z direction (as shown in FIG. 2 ), the protrusion 3312 extends obliquely toward the rivet column 332.

[0150] In some specific examples, such as Figure 4 and Figure 5As shown, in the direction from top to bottom, the protrusion 3312 is obliquely extended toward the rivet column 332. When the connection portion 321 of the flexible circuit board 32 and the electrical connection sheet 31 are riveted together using the rivet 33, the lower end of the protrusion 3312 pierces the connection portion 321 and abuts against the upper surface of the electrical connection sheet 31. Then, in the direction from top to bottom, since the protrusion 3312 is obliquely extended toward the rivet column 332, the lower end of the protrusion 3312 will deform and move from outside to inside in the radial direction of the rivet cap 331 under the action of pressure, so that the protrusion 3312 can play a stronger fixing role on the connection portion 321. In other words, the protrusion 3312 first pierces the connection portion 321 to connect with the copper foil of the connection portion 321, and then buckles inward under the action of pressure, thereby further strengthening the connection strength with the connection portion 321.

[0151] In the above technical solution, in the direction from the cap body 3311 toward the deformation boss 333, by obliquely extending the protrusion 3312 toward the rivet column 332, the fixing effect of the protrusion 3312 on the connecting part 321 can be further strengthened, so that the electrical connecting piece 31 and the connecting part 321 can maintain a stable connection even in a vibration or impact environment.

[0152] In some embodiments of the present application, Fig.10 As shown, 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°.

[0153] For example, the angle between the protrusion 3312 and the central axis of the rivet column 332 may be 5°, 6°, 7°, 8°, 9°, and 10°. When the angle between the protrusion 3312 and the central axis of the rivet column 332 is less than 5°, the protrusion 3312 may scratch the electrical connection sheet 31 after piercing the connection portion 321, or the protrusion 3312 may be damaged due to excessive pressure on the protrusion 3312 itself, thereby affecting the connection effect between the protrusion 3312 and the connection portion 321.

[0154] When the angle between the protrusion 3312 and the central axis of the rivet column 332 is greater than 10°, the protrusion 3312 will deform and buckle inward in advance before piercing the connecting part 321. That is, the protrusion 3312 buckles inward before piercing the connecting part 321, resulting in poor contact between the copper foil of the protrusion 3312 and the connecting part 321, thereby affecting the connection effect.

[0155] Setting the angle between the protrusion 3312 and the central axis of the rivet column 332 to be greater than or equal to 5° and less than or equal to 10° can keep the angle within a reasonable range. This can reduce the possibility of damage to the protrusion 3312 and the electrical connection sheet 31, and enable the protrusion 3312 to first pierce the connection portion 321 and then deform and buckle inward, thereby effectively improving the connection effect between the protrusion 3312 and the connection portion 321.

[0156] In the above technical solution, by setting the angle between the protrusion 3312 and the central axis of the rivet column 332 to be greater than or equal to 5° and less than or equal to 10°, it is possible to effectively protect the protrusion 3312 and the electrical connection sheet 31, and effectively guide the protrusion 3312 to first pierce the connection part 321 and then deform and buckle inward, thereby effectively improving the connection effect between the protrusion 3312 and the connection part 321.

[0157] It should be noted that the angle between the protrusion 3312 and the central axis of the riveted column 332 can be measured by measuring tools such as a coordinate measuring machine, an angle gauge, and a universal angle ruler. The following describes a method for measuring the angle between the protrusion 3312 and the central axis of the riveted column 332 using a coordinate measuring machine as an example. First, data points on the workpiece surface are obtained by using a probe contact or laser scanning method of a coordinate measuring machine, and then geometric parameters such as angles are calculated based on the data points.

[0158] In some embodiments of the present application, Fig.10 As shown, 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.

[0159] For example Fig.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 protrusion 3312 is not too close to the edge of the cap body 3311 nor too close to the center of the cap body 3311 relative to the cap body 3311, but is in a reasonable position. As a result, the possibility of stress concentration on the edge of the cap body 3311 caused by the protrusion 3312 being too close to the edge of the cap body 3311 can be effectively reduced, and the possibility of the protrusion 3312 not being able to completely pierce the connecting portion 321 due to the protrusion 3312 being too close to the center of the cap body 3311 can be effectively reduced.

[0160] 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, not only can the possibility of stress concentration at the edge of the cap body 3311 be effectively reduced, thereby effectively reducing the risk of damage to the cap body 3311 and improving the durability of the cap body 3311, but also the protrusion 3312 can be made to completely pierce the connecting portion 321, thereby improving the connection quality between the protrusion 3312 and the connecting portion 321.

[0161] 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. The following describes a method for measuring the first spacing L1 and the second spacing L2 by taking a coordinate measuring machine as an example. First, data points on the surface of the workpiece are obtained by using a probe contact or laser scanning of the coordinate measuring machine, and then geometric parameters such as angles are calculated based on the data points.

[0162] In some embodiments of the present application, Fig.10 As shown, in the direction from the cap body 3311 toward the deformation boss 333 (for example Fig.10 In the Z direction (as shown in FIG. ), the cross-sectional area of ​​the protrusion 3312 gradually decreases.

[0163] In some specific examples, such as Fig.10 As shown, in the direction from top to bottom, the cross-sectional area of ​​the protrusion 3312 gradually decreases, that is, the cross-sectional area of ​​the upper end of the protrusion 3312 is large, the strength is large, and it is not easy to deform, while the cross-sectional area of ​​the lower end of the protrusion 3312 is small, the strength is small, it is easy to deform and easy to pierce the connecting part 321.

[0164] In the above technical solution, the cross-sectional area of ​​the protrusion 3312 gradually decreases in the direction from the cap body 3311 toward the deformation boss 333, which can help the protrusion 3312 to gradually pierce the connecting portion 321 when the rivet 33 is riveted, and guide the protrusion 3312 to gradually deform and buckle inward after the protrusion 3312 pierces the connecting portion 321, thereby facilitating the riveting operation and effectively improving the riveting efficiency.

[0165] In some embodiments of the present application, Fig.10 and Fig.11 As shown, the protrusion 3312 is in the shape of a polygonal prism, or the protrusion 3312 is in the shape of a cone.

[0166] For example, the protrusion 3312 may be in the shape of a polygonal prism; or in another example, the protrusion 3312 may be in the shape of a cone. Fig.10 and Fig.11 As shown, the protrusion 3312 is in a cone shape, and further, the cross-section of the protrusion 3312 is in a triangular shape.

[0167] In the above technical solution, by setting the protrusion 3312 to a polygonal prism or a cone shape, the stress applied by the protrusion 3312 to the connection part 321 can be effectively increased when the protrusion 3312 pierces the connection part 321, thereby facilitating the protrusion 3312 to pierce the connection part 321, thereby effectively reducing the external force applied during the riveting process and improving the convenience of operation. In addition, the protrusion 3312 can be made to fit the edge of the opening more closely, thereby further improving the sealing of the connection between the protrusion 3312 and the connection part 321.

[0168] In some embodiments of the present application, Fig.10 As shown, 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.

[0169] For example Fig.10 As shown, the height H of the protrusion 3312 may be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, and 1 mm.

[0170] In the above technical solution, in the axial direction of the riveted column 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 the protrusion 3312 has a sufficient height dimension, so that the protrusion 3312 can completely pierce the connecting portion 321, thereby reducing the possibility of poor contact, thereby effectively improving the reliability of the connection, but also the possibility of the protrusion 3312 piercing the connecting portion 321 and scratching the electrical connecting piece 31 due to the excessive height dimension of the protrusion 3312 can be effectively reduced, thereby effectively protecting the electrical connecting piece 31.

[0171] It should be noted that the height H of the protrusion 3312 can be measured by measuring tools such as a coordinate measuring machine, a vernier caliper, and a micrometer. The following describes a method for measuring the height H of the protrusion 3312 by taking a coordinate measuring machine as an example. First, data points on the surface of the workpiece are obtained by using a probe contact or laser scanning of the coordinate measuring machine, and then geometric parameters such as angles are calculated based on the data points.

[0172] In some embodiments of the present application, Fig.11 As shown, 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.

[0173] For example, the cross-sectional width of one end of the protrusion 3312 connected to the cap body 3311 may be 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, and 0.3 mm.

[0174] In the above technical solution, by setting the minimum width of the cross-section of one end where the protrusion 3312 is connected to the cap body 3311 to be greater than or equal to 0.2 mm, the connection between the protrusion 3312 and the cap body 3311 can have sufficient connection strength, thereby reducing the possibility of damage to the connection between the protrusion 3312 and the cap body 3311, thereby effectively improving the reliability and durability of the protrusion 3312.

[0175] In some embodiments of the present application, Fig.11 As shown, 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 one end of the protrusion 3312 is greater than or equal to 2 mm and less than or equal to 3 mm.

[0176] For example, in the circumferential direction of the cap body 3311 , the length of one end of the protrusion 3312 may be 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, and 3 mm.

[0177] In the above technical solution, on the circumference of the cap body 3311, the length of one end of the protrusion 3312 is greater than or equal to 2 mm and less than or equal to 3 mm, so that the protrusion 3312 can have sufficient contact area with the copper foil of the connecting part 321 after piercing the connecting part 321, thereby effectively reducing the contact resistance between the protrusion 3312 and the copper foil of the connecting part 321, thereby 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 protrusion 3312 and the connecting part 321.

[0178] In some embodiments of the present application, Fig.10 and Fig.11 As shown, there are multiple protrusions 3312 , and the multiple protrusions 3312 are arranged at intervals along the circumference of the cap body 3311 .

[0179] For example, the number of the protrusions 3312 may be two, three, four, five, or more than six. In some specific examples, the plurality of protrusions 3312 are evenly spaced along the circumference of the cap body 3311 .

[0180] In the above technical solution, by setting the number of the protrusions 3312 to be multiple, the multiple protrusions 3312 are arranged at intervals along the circumference of the cap body 3311, so that the copper foil of the protrusions 3312 and the connecting portion 321 can contact at multiple points in the circumference of the cap body 3311, thereby 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 protrusions 3312 and the connecting portion 321.

[0181] In some embodiments of the present application, Fig.10 and Fig.11 As shown, the number of the protrusions 3312 is greater than or equal to 3 and less than or equal to 5.

[0182] For example, the number of protrusions 3312 may be three, four, or five. Fig.10 and Fig.11 As shown, the number of the protrusions 3312 is three. Furthermore, the plurality of protrusions are evenly spaced along the circumference of the cap body 3311 , and the plurality of protrusions 3312 have the same shape and size.

[0183] In the above technical solution, by setting the number of the protrusions 3312 to be greater than or equal to 3 and less than or equal to 5, the protrusions 3312 and the connecting portion 321 can have good mechanical support and connection effects, while the excessive number of protrusions 3312 will not lead to waste of materials or complicated processing, thereby effectively saving costs and effectively improving processing efficiency.

[0184] In some embodiments of the present application, the electrical connection sheet 31 is an aluminum sheet.

[0185] It should be noted that the density of aluminum material is small, and the use of aluminum material for the electrical connection piece 31 can effectively reduce the weight of the entire battery device 100. At the same time, the aluminum material also has reliable mechanical strength, which can provide a 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 and improves the reliability of the electrical connection piece 31 in long-term use.

[0186] In the above technical solution, by setting the electrical connection sheet 31 as an aluminum sheet, the weight and production cost of the battery device 100 can be effectively reduced, and the strength and corrosion resistance of the connection sheet can be effectively improved, thereby effectively improving the durability and service life of the electrical connection sheet 31.

[0187] In some embodiments of the present application, the rivet 33 is integrally formed, and / or the rivet 33 is made of aluminum.

[0188] For example, the rivet 33 is integrally formed; for another example, the rivet 33 is made of aluminum; for another example, the rivet 33 is integrally formed and the rivet 33 is made of aluminum. In some specific examples, the rivet 33 is integrally formed and the rivet 33 is made of aluminum.

[0189] In the above technical solution, by setting the rivet 33 as an integrally formed part, not only can the overall strength of the rivet 33 be effectively improved, thereby effectively improving the reliability of the connection between the electrical connecting piece 31 and the connecting portion 321, but also the assembly process can be effectively simplified, thereby effectively improving production efficiency; by setting the rivet 33 as an aluminum material, the conductivity and corrosion resistance of the rivet 33 can be effectively improved, the resistance loss can be reduced and the connection can be effectively protected, thereby effectively improving the efficiency of current transmission and the service life of the rivet 33.

[0190] 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 sheets 31 is multiple, and the multiple electrical connection sheets 31 are connected to the multiple connection portions 321 in a one-to-one correspondence.

[0191] For example, the number of the plurality of spaced connection portions 321 may be six, eight, ten, twelve, or fourteen or more, and each connection portion 321 is connected to a corresponding electrical connection sheet 31. In other words, a flexible circuit board 32 may be connected to the electrical connection sheet 31 through a plurality of connection portions 321, and further, a dedicated pneumatic tool may be used to simultaneously perform riveting connection on a plurality of points, thereby effectively improving production efficiency.

[0192] In the above technical solution, by providing a plurality of spaced connection portions 321 on the flexible circuit board 32, and the number of electrical connection sheets 31 is multiple, and the multiple electrical connection sheets 31 are connected to the multiple connection portions 321 one by one, the flexible circuit board 32 can have multiple electrical contact points, so that the current distribution is more uniform, thereby effectively reducing the risk of local overheating of the flexible circuit board 32. In addition, the battery device 100 can also have a reasonable redundant design, thereby effectively improving the reliability of the battery device 100.

[0193] Second, as Figure 1 As shown, an embodiment of the present application further provides an electrical device 1, comprising a battery device 100 according to any one of the above embodiments.

[0194] For example Figure 1 As shown, the power-consuming device 1 may be a vehicle. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle is provided with a battery device 100, and the battery device 100 may be provided at the bottom, head or tail of the vehicle. The battery device 100 may be used to power the vehicle, for example, the battery device 100 may be used as an operating power source for the vehicle.

[0195] 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, for starting, navigating, and driving the vehicle. In some specific examples, the battery device 100 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0196] In the above technical solution, by setting the battery device 100 of the first aspect, and the connecting portion 321 of the electrical connecting piece 31 and the flexible circuit board 32 in the battery device 100 is riveted and connected by a rivet 33, not only can the connection quality of the electrical connecting piece 31 and the flexible circuit board 32 be effectively improved, thereby effectively improving the reliability of the connection between the electrical connecting piece 31 and the flexible circuit board 32, but also the process of connecting the electrical connecting piece 31 and the flexible circuit board 32 can be effectively simplified, thereby effectively improving work efficiency and effectively reducing costs.

[0197] In a third aspect, the embodiment of the present application further provides a connection structure 30, including: an electrical connection sheet 31 and a flexible circuit board 32. The electrical connection sheet 31 is the electrical connection sheet 31 in the battery device 100 of any of the above embodiments, and the flexible circuit board 32 is the flexible circuit board 32 in the battery device 100 of any of the above embodiments. The electrical connection sheet 31 and the flexible circuit board 32 are riveted together by a rivet 33.

[0198] In some specific examples, such as Figure 4 As shown, the flexible circuit board 32 has a connecting portion 321, and the connecting portion 321 is riveted to the electrical connection sheet 31 through a rivet 33. Furthermore, the connecting portion 321 is integrally formed with the flexible circuit board 32 and extends toward the outside of the flexible circuit board 32. Both the electrical connection sheet 31 and the connecting portion 321 have sufficient mechanical strength to withstand the pressure during the riveting process, thereby ensuring good electrical contact between the electrical connection sheet 31 and the flexible circuit board 32. When the flexible circuit board 32 and the electrical connection sheet 31 are riveted together through the rivet 33, electrical signals can be transmitted to the electrical connection sheet 31, the rivet 33, the flexible circuit board 32 and the battery management system in sequence, thereby achieving real-time monitoring and control of the state of the battery device 100.

[0199] 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.

[0200] 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.

[0201] 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.

[0202] S2 , making the rivet cap 331 come into contact with the flexible circuit board 32 .

[0203] For example Figure 3 As 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.

[0204] 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 .

[0205] In some specific examples, such as Figure 3As 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.

[0206] S4, continue to pull the rivet rod 334 until the rivet rod 334 is broken.

[0207] It should be noted that a structural weak area is provided at one end of the rivet rod 334 close to the rivet column 333a. In some specific examples, the structural weak area is provided close to the lower end of the rivet rod 334, 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 which time the rivet rod 334 is pulled off, and the connecting portion 321 of the electrical connection sheet 31 and the flexible circuit board 32 are riveted together, and the riveting is completed.

[0208] In the above technical scheme, by using the riveting method of the connection structure 30 of the fourth aspect, the electrical connection piece 31 and the flexible circuit board 32 of the connection structure 30 of the third aspect are riveted and connected, which 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 process of connecting the electrical connection piece 31 and the flexible circuit board 32, thereby effectively improving work efficiency and effectively reducing costs.

[0209] In some embodiments of the present application, the rivet cap 331 includes a cap body 3311 and a protrusion 3312, the protrusion 3312 is connected to the cap body 3311 and is located on the side of the cap body 3311 facing the connecting portion 321, the protrusion 3312 is configured to be suitable for piercing the flexible circuit board 32, and in step S3, after pulling the rivet rod 334, step S3 also includes: making the protrusion 3312 pierce the flexible circuit board 32 and connect with the copper foil inside the flexible circuit board 32.

[0210] In some specific examples, such as Figure 3 As shown, the upper end of the protrusion 3312 is connected to the lower surface of the cap body 3311. Furthermore, the number of the protrusions 3312 is three, and the multiple protrusions 3312 are extended along the circumference of the cap body 3311 and are evenly distributed.

[0211] In step S3, after the rivet rod 334 is pulled, the rivet column 333a is gradually deformed under the pulling force of the rivet rod 334 and forms a deformation boss 333 that abuts against the periphery of the first through hole 310. While the rivet rod 334 is pulled, the periphery of the cap body 3311 abuts against the periphery 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 through the connection portion 321, the protrusion 3312 can be fixed and connected to the copper foil of the connection portion 321, thereby achieving mechanical and electrical connection between the protrusion 3312 and the connection portion 321.

[0212] That is, the protrusion 3312 penetrates the connection part 321 from top to bottom and is directly connected to the copper foil, thereby reducing the possibility of poor contact between the protrusion 3312 and the copper foil of the connection part 321, thereby further improving the reliability of the connection between the protrusion 3312 and the copper foil of the connection part 321. In addition, since the protrusion 3312 pierces the connection part 321 to form an opening, it is not necessary to pre-set an opening on the insulating layer on the upper surface of the copper foil, thereby effectively reducing the pre-processing steps.

[0213] In the above technical solution, after the rivet rod 334 is pulled in step S3, the protrusion 3312 is set to pierce the flexible circuit board 32 and connect with the copper foil in the flexible circuit board 32, which can not only further improve the connection effect between the rivet 33 and the connecting part 321, but also simplify the processing flow of the connecting part 321, thereby effectively improving production efficiency.

[0214] In some embodiments of the present application, the first through hole 310 on the electrical connection sheet 31 is formed by stamping.

[0215] It should be noted that stamping is a commonly used metal processing technology that uses a mold to cause the material to undergo plastic deformation under pressure to obtain the desired shape and size.

[0216] In the above technical solution, the first through holes 310 on the electrical connection sheet 31 are formed by stamping, so that the processing of multiple first through holes 310 can be completed in a short time, thereby effectively improving the processing efficiency of the first through holes 310. In addition, the stamping process can also accurately control the size and position of the first through holes 310, and effectively reduce the possibility of defects caused by manual operation or other mechanical processing, thereby effectively improving the processing quality of the first through holes 310.

[0217] The following will refer to Figure 2-Figure 11 A battery device 100 according to a specific embodiment of the present application is described.

[0218] like Figure 2-Figure 5 As shown, the battery device 100 includes a battery cell 10 , a case 20 and a connection structure 30 .

[0219] like Figure 2 As shown, the box body 20 includes a box body 21 and a cover body 22. The box body 21 is a rectangular parallelepiped with an open top. The cover body 22 covers the top of the box body 21. The periphery of the cover body 22 is fastened to the periphery of the box body 21 by fasteners. A plurality of battery cells 10 are stacked and arranged along the length direction of the box body 20 to form a battery cell 10 assembly. The plurality of battery cell 10 assemblies are arranged in sequence along the width direction of the box body 20.

[0220] like Figure 3-Figure 5 As shown, the connection structure 30 includes an electrical connection sheet 31 , a flexible circuit board 32 and a rivet 33 .

[0221] like Figure 6 and Figure 7 As shown, the electrical connection sheet 31 is an aluminum sheet, and one end of the electrical connection sheet 31 is provided with a first through hole 310 that passes through the electrical connection sheet 31 in the up-down direction. The first through hole 310 is a circular hole, and the first through hole 310 is formed by stamping. Further, the periphery of the first through hole 310 is folded upward to form a riveted portion 311, and the riveted 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 arranged obliquely toward the center of the first through hole 310, and the horizontal section 3112 extends along a straight line arranged horizontally 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, 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°.

[0222] The flexible circuit board 32 includes a plurality of connection parts 321 arranged at intervals, and a second through hole is formed on the connection part 321, which passes through the electrical connection piece 31 in the up-down direction, and the second through hole is a circular hole, and the connection part 321 is integrally formed with the flexible circuit board 32 and extends toward the outside of the flexible circuit board 32. There are a plurality of electrical connection pieces 31, and the plurality of electrical connection pieces 31 are connected to the plurality of connection parts 321 in a one-to-one correspondence. Further, the flexible circuit board 32 is connected to the battery management system.

[0223] like Figure 3-Figure 5 As shown, the rivet member 33 comprises a rivet cap 331, a rivet column 332 and a deformation boss 333 after riveting. Fig.10 and Fig.11 As shown, the rivet member 33 before riveting includes a rivet column 333a, a rivet cap 331 and a rivet rod 334. Further, the rivet member 33 is integrally formed and is made of aluminum.

[0224] like Figure 3-Figure 5 As shown, the rivet cap 331 is located on the upper side of the connecting portion 321, and the deformable boss 333 is located on the lower side of the electrical connection sheet 31. The upper end of the rivet column 332 is connected to the rivet cap 331, and the lower end of the rivet column 332 is connected to the deformable boss 333. The diameters of the rivet cap 331 and the rivet column 332 are both larger than the diameters of the first through hole 310 and the second through hole. Furthermore, the deformable boss 333 is firmly abutted against the lower peripheral edge of the first through hole 310, and the rivet cap 331 is firmly abutted against the upper peripheral edge of the second through hole. Figure 5 As shown, the rivet cap 331 extends in a ring shape along the circumference of the rivet column 332 , and in the direction from the radial outside to the inside of the rivet cap 331 , the rivet cap 331 extends along a straight line that extends obliquely away from the deformation boss 333 .

[0225] like Fig.10 As shown, the rivet cap 331 includes a cap body 3311 and a protrusion 3312 .

[0226] like Fig.10 As shown, the entire lower side surface of the cap body 3311 is formed as an inclined surface extending obliquely, and in the radial direction from the outside to the inside of the rivet column 332, the inclined surface extends upward obliquely, and the angle θ between the inclined surface and the central axis of the rivet column 332 is greater than or equal to 60°. Furthermore, the inclined surface of the cap body 3311 toward the side of the deformation boss 333 is extended along the circumference of the rivet column 332 to be set as an annular structure.

[0227] The upper end of the protrusion 3312 is connected to the lower surface of the cap body 3311. In the direction from the cap body 3311 toward the deformation boss 333, the protrusion 3312 extends obliquely toward the rivet column 332. Further, the angle between the protrusion 3312 and the central axis of the rivet 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 protrusion 3312 and the radial outer edge of the cap body 3311 is a first spacing, and the distance between the radial outer edge and the radial inner edge of the cap body 3311 is a 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.

[0228] like Fig.10 and Fig.11 As shown, the number of the protrusions 3312 is three, and the multiple protrusions are evenly spaced along the circumference of the cap body 3311. In the direction from the cap body 3311 toward the deformation boss 333, the cross-sectional area of ​​the protrusion 3312 gradually decreases. Furthermore, the shape of the protrusion 3312 is a polygonal prism, and the 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 one end of the protrusion 3312 is greater than or equal to 2mm and less than or equal to 3mm. In the axial direction of the rivet column 332, the height of the protrusion 3312 is greater than or equal to 0.5mm and less than or equal to 1mm. The minimum width of the cross section of the end of the protrusion 3312 connected to the cap body 3311 is greater than or equal to 0.2mm.

[0229] 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 .

[0230] 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.

[0231] 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.

[0232] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall 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), wherein the flexible circuit board (32) has a connecting portion (321), and the connecting portion (321) is riveted to the electrical connection sheet (31) via a rivet (33).

2. The battery device according to claim 1, characterized in that: 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 component (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).

3. The battery device according to claim 2, 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).

4. The battery device according to claim 3, 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).

5. The battery device according to claim 4, 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°.

6. The battery device according to claim 2, characterized in that: 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).

7. The battery device according to claim 6, 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°.

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

9. The battery device according to claim 6, 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).

10. The battery device according to claim 2, 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.

11. The battery device according to claim 10, 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.

12. The battery device according to claim 11, 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).

13. The battery device according to claim 12, characterized in that: In the direction from the cap body (3311) toward the deformation boss (333), the protrusion (3312) extends obliquely toward the rivet column (332).

14. The battery device according to claim 13, 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°.

15. The battery device according to claim 12, 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.

16. The battery device according to claim 12, 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.

17. The battery device according to claim 16, 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.

18. The battery device according to claim 12, 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.

19. The battery device according to claim 12, 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.

20. The battery device according to claim 12, 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.

21. The battery device according to claim 11, 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).

22. The battery device according to claim 21, characterized in that The number of the protrusions (3312) is greater than or equal to 3 and less than or equal to 5.

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

24. 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.

25. 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.

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

27. 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 24, 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 24, and the electrical connection sheet (31) and the flexible circuit board (32) are riveted together by a rivet (33).

28. A riveting method for a connection structure, wherein the connection structure (30) is the connection structure (30) according to claim 27, 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.

29. The riveting method of the connection structure according to claim 28, 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).

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

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