Fastener, battery device and electric device

Abstract

The utility model provides a fastener, a battery device and a power utilization device. The fastener comprises a thread and a supporting part, the supporting part is connected to the thread, the peripheral surface of the supporting part comprises a supporting surface, the supporting surface is configured to be capable of receiving external torque and transmitting the torque to the thread, the supporting surface comprises a first arc surface and two flat and straight surfaces, the first arc surface is bent outwards in the direction perpendicular to the axial direction of the fastener, and the first arc surface is bent outwards in the direction perpendicular to the axial direction of the fastener. The two flat and straight faces are connected to the two ends, in the circumferential direction of the fastener, of the first arc face correspondingly. The service life of the fastener can be prolonged, and the stress performance of the fastener can be improved.

Description

Technical Field

[0001] This application relates to the field of fastener technology, and in particular to a fastener, a battery device, and an electrical device. Background Technology

[0002] Fasteners are used in many applications to attach various components together. For some environments where fasteners need to be frequently installed and removed, the service life and stress resistance of fasteners are particularly important.

[0003] Therefore, how to balance improving the service life and load-bearing capacity of fasteners is a technical problem that requires continuous improvement. Utility Model Content

[0004] In view of the above problems, this application provides a fastener, a battery device, and an electrical device that can improve both the service life and stress resistance of the fastener.

[0005] This application provides a fastener including a thread and a support portion. The support portion is connected to the thread, and the outer peripheral surface of the support portion includes a support surface. The support surface is configured to receive external torque and transmit torque to the thread. The support surface includes a first arc surface and two flat surfaces. The first arc surface is bent outward in a direction perpendicular to the axial direction of the fastener, and the two flat surfaces are respectively connected to the two ends of the first arc surface along the circumference of the fastener.

[0006] The first arc surface of the aforementioned technical solution is located at the end of the supporting surface. The smooth transition of the first arc surface allows for a more uniform stress distribution, reducing localized stress concentration caused by sharp angles or abrupt geometric changes, and improving the fatigue resistance of the supporting surface. Two straight surfaces are located on either side of the first arc surface along the circumference of the fastener. These straight surfaces provide a stable stress-bearing area, thereby optimizing the force transmission path and more efficiently transmitting external torque to the thread. This results in better stress distribution on the fastener along its central axis rotation direction, facilitating fastener installation and removal. Thus, by designing the fastener's supporting surface as a combination of arc and straight surfaces, both the service life and stress resistance of the fastener can be improved.

[0007] In some embodiments of the first aspect, there are multiple support surfaces arranged circumferentially.

[0008] Multiple support surfaces can share the external force, thereby further improving the service life and reliability of fasteners.

[0009] In some embodiments of the first aspect, in two adjacent support surfaces, the flat surface of one support surface has an included angle S with the flat surface of the other support surface adjacent to it, and the included angle S satisfies the following relationship with the number of support surfaces N: 360° / N≤S≤210°, N≥2, and N is an integer.

[0010] The above-described technical solution, by setting the included angle S within the aforementioned range, reduces the risk of insufficient tangential force used to drive the fastener to rotate along the central axis, thus improving torque transmission efficiency and optimizing the fastener's stress distribution, making it easier to install and remove. Furthermore, introducing a flat surface into the support surface also reduces the design and fabrication difficulty of the included angle S.

[0011] In some embodiments of the first aspect, the included angle S and the quantity N satisfy the relationship: 360° / N≤S≤150°, N≥3. This can further improve the stress resistance of the fastener.

[0012] In some embodiments of the first aspect, the outer peripheral surface has a first projection along the axial direction, and the geometric center of the first projection passes through the axis of the thread. The maximum distance r1 from the geometric center to the first projection, the minimum distance r2 from the geometric center to the first projection, and the nominal diameter D of the thread satisfy the relationship: 0.1≤(r1-r2) / D≤0.85.

[0013] The above technical solution can improve the service life of fasteners while reducing their space occupancy and cost.

[0014] In some embodiments of the first aspect, the maximum distance r1 from the geometric center to the first projection, the minimum distance r2 from the geometric center to the first projection, and the nominal diameter D of the thread satisfy the relationship: 0.15≤(r1-r2) / D≤0.6.

[0015] It can further optimize the service life of fasteners and reduce the space occupation and cost of fasteners.

[0016] In some embodiments of the first aspect, the maximum distance r1 from the geometric center to the first projection and the minimum distance r2 from the geometric center to the first projection satisfy the relationship: 1.5mm ≤ r1 - r2 ≤ 20mm.

[0017] It can improve the service life of fasteners while reducing their space occupation and cost.

[0018] In some embodiments of the first aspect, the maximum distance r1 from the geometric center to the first projection and the minimum distance r2 from the geometric center to the first projection satisfy the relationship: 3mm≤r1-r2≤10mm.

[0019] In some embodiments of the first aspect, the support portion further includes a transition surface, the support surface and the transition surface being arranged circumferentially, and a flat surface connecting the first arcuate surface and the transition surface.

[0020] The above technical solution introduces a transition surface, which does not bear the force from the tool when the tool tightens or loosens the fastener. Therefore, the thickness of the part corresponding to the transition surface of the support can be appropriately reduced, thereby helping to reduce the amount of support used and reducing the space occupation rate and cost of the fastener.

[0021] In some embodiments of the first aspect, the transition surface is a second arcuate surface that is curved inward in a direction perpendicular to the axial direction.

[0022] The above technical solution sets the transition surface as a second arc surface, which not only further reduces the uniformity of stress distribution in the support part and improves the service life of the fastener through the smooth transition of the second arc surface, but also helps to further reduce the thickness of the part corresponding to the transition surface of the support part, thereby reducing the space occupation rate and cost of the fastener.

[0023] In some embodiments of the first aspect, the curvature R of the first arc surface is: 1mm ≤ R ≤ 25mm. By setting the curvature R of the first arc surface within the above range, both the service life and stress resistance of the fastener can be improved.

[0024] In some embodiments of the first aspect, the curvature R of the first arc surface is: 3mm ≤ R ≤ 5mm. This effectively improves the stress resistance and service life of the fastener.

[0025] In some embodiments of the first aspect, the support portion is provided with a through hole that extends axially through the support portion. The thread includes an internal thread disposed within the through hole.

[0026] In some embodiments of the first aspect, the fastener further includes a shank connected to a support portion. The thread includes an external thread disposed on the shank.

[0027] In some embodiments of the first aspect, the support includes six support surfaces arranged circumferentially.

[0028] Commercially available standard sockets and other tools are generally hexagonal. When no specially designed sockets or tools for this application embodiment are available, a slightly larger standard socket can be temporarily used to drive the rotation of the fasteners in this application embodiment. Thus, the above technical solution improves the applicability and ease of use of the fasteners in this application embodiment.

[0029] Secondly, this application provides a battery device that includes the fasteners provided in any of the embodiments of the first aspect.

[0030] Thirdly, this application provides an electrical device that includes the battery device provided in any embodiment of the second aspect, the battery device being used to store or provide electrical energy.

[0031] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0032] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0033] Figure 1 A top view of a fastener provided in some embodiments of this application;

[0034] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along AA;

[0035] Figure 3 for Figure 1 A magnified schematic diagram of the local structure at point H;

[0036] Figure 4 This is a schematic diagram of the axial projection structure of the outer peripheral surface of a fastener provided in some embodiments of this application;

[0037] Figure 5 This is a top view of another fastener provided in some embodiments of this application;

[0038] Figure 6 This is a top view of another fastener provided in some embodiments of this application;

[0039] Figure 7 This is a top view of another fastener provided in some embodiments of this application;

[0040] Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure along BB.

[0041] The reference numerals in the detailed embodiments are as follows:

[0042] 10. Thread;

[0043] 20. Support portion; 21. Support surface; 211. First arc surface; 212. Straight surface; 22. Transition surface;

[0044] 30. Through hole; 40. Rod section;

[0045] X, axial direction; Y, circumferential direction. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0048] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0051] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0052] In this application, "multiple" means two or more (including two).

[0053] In this application, the term "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0054] Fasteners are used in many applications to attach various components together. For environments requiring frequent fastener installation and removal, the lifespan and load-bearing capacity of fasteners become particularly important. Therefore, balancing fastener lifespan and load-bearing capacity is a continuously evolving technical challenge.

[0055] For example, in vehicles with battery swapping capabilities, the fasteners used to attach the battery to the frame need to be installed and removed frequently.

[0056] The support surface of a conventional hexagonal nut consists of multiple planes, which form sharp angles between them. These sharp angles are very fragile and easily worn. After the hexagonal nut is used with a tool for repeated tightening, the sharp angles will gradually wear down, causing the outer circumference of the hexagonal nut to become rounded and thus lose its tool-driving ability.

[0057] In related technologies, Torx nuts are often used to replace hexagonal nuts to reduce corner wear and improve service life. The supporting surface of a Torx nut consists of multiple arc surfaces. The smooth transition of the arc surfaces allows for a more even distribution of stress. While this structure has certain advantages in terms of wear resistance, the smooth transition of the arc surfaces also makes the force transmission path more dispersed. This results in poorer force distribution along the rotational direction of the fastener's central axis under the same external force. In other words, during the tightening or loosening of the fastener, relative slippage between the fastener and the tool can easily occur, which to some extent affects the installation and removal experience of the fastener.

[0058] In view of this, embodiments of this application provide a fastener, the fastener including a thread and a support portion, the support portion being connected to the thread, the outer peripheral surface of the support portion including a support surface, the support surface being configured to receive external torque and transmit torque to the thread, the support surface including a first arc surface and two flat surfaces, the first arc surface being bent outward in a direction perpendicular to the axial direction of the fastener, and the two flat surfaces being respectively connected to the two ends of the first arc surface along the circumference of the fastener.

[0059] The first arc surface of the aforementioned technical solution is located at the end of the supporting surface. The smooth transition of the first arc surface allows for a more uniform stress distribution, reducing localized stress concentration caused by sharp angles or abrupt geometric changes, and improving the fatigue resistance of the supporting surface. Two straight surfaces are located on either side of the first arc surface along the circumference of the fastener. These straight surfaces provide a stable stress-bearing area, thereby optimizing the force transmission path and more efficiently transmitting external torque to the thread. This results in better stress distribution on the fastener along its central axis rotation direction, facilitating fastener installation and removal. Thus, by designing the fastener's supporting surface as a combination of arc and straight surfaces, both the service life and stress resistance of the fastener can be improved.

[0060] Figure 1 This is a top view schematic diagram of a fastener provided in some embodiments of this application. Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure along AA. Figure 3 for Figure 1 A magnified schematic diagram of the structure at point H.

[0061] Continue to refer to Figures 1 to 3 This application provides a fastener including a thread 10 and a support portion 20. The support portion 20 is connected to the thread 10. The outer peripheral surface of the support portion 20 includes a support surface 21. The support surface 21 is configured to receive external torque and transmit torque to the thread 10. The support surface 21 includes a first arc surface 211 and two flat surfaces 212. The first arc surface 211 is bent outward in a direction perpendicular to the axial direction X of the fastener. The two flat surfaces 212 are respectively connected to the two ends of the first arc surface 211 along the circumferential direction Y of the fastener.

[0062] Thread 10 can be an internal thread or an external thread. For example, the fastener can be a nut or any other fastener with an internal thread. Alternatively, the fastener can be a bolt or any other fastener with an external thread.

[0063] The support portion 20 is the part of the fastener used to receive external torque, which can be applied manually or with tools. The support portion 20 may extend along the entire axial X length of the fastener, or it may extend only along a portion of the axial X length of the fastener.

[0064] The support surface 21 is configured to receive torque from tools such as sockets or wrenches and transmit the torque to the thread 10.

[0065] The number of support surfaces 21 can be one or more, where "more" refers to two or more. As an example, when there are multiple support surfaces 21, the multiple support surfaces 21 can be spaced apart along the circumferential Y direction of the fastener, or they can be directly connected along the circumferential Y direction of the fastener.

[0066] Each support surface 21 may include two torque support sides, which are arranged opposite each other along the circumferential Y direction of the fastener. Each torque support side may be designed to receive torque from a tool such as a socket or wrench and to transmit torque to the thread 10 depending on whether the tool tightens or loosens the fastener.

[0067] For example, the two torque support sides are designated as a first torque support side and a second torque support side, which are arranged opposite to each other along the circumferential Y-direction of the fastener. If the tool tightens the fastener, the first torque support side can receive torque from the tool and transmit the torque to the thread 10 portion. Conversely, if the tool loosens the fastener, the second torque support side can receive torque from the tool and transmit the torque to the thread 10 portion. When the fastener is tightened or loosened, the first torque support side and the second torque support side can switch according to the direction of the thread 10.

[0068] The first arc surface 211 is bent outward in a direction perpendicular to the axial direction X of the fastener. By way of example, the outward bending can also be understood as bending in a direction away from the geometric center of the support portion 20.

[0069] Two flat surfaces 212 are respectively connected to the two ends of the first arc surface 211 along the circumferential Y direction of the fastener. For example, the two ends of the first arc surface 211 along the circumferential Y direction of the fastener can also be understood as the two opposite edges of the first arc surface 211 along the circumferential Y direction of the fastener.

[0070] As an example, in the case where multiple support surfaces 21 are directly connected along the circumferential Y direction of the fastener, in two adjacent support surfaces 21, the flat surface 212 of one support surface 21 is directly connected to the flat surface 212 of the other support surface 21 adjacent to it.

[0071] As an example, in the case where multiple support surfaces 21 are spaced apart along the circumferential Y direction of the fastener, in two adjacent support surfaces 21, the flat surface 212 of one support surface 21 is indirectly connected to the flat surface 212 of the other adjacent support surface 21 through other surfaces.

[0072] It is understandable that if the support surface 21 is formed by multiple adjacent flat surfaces 212 directly connected together, sharp corners with sharp angles are formed between multiple planes. The sharp corners are very fragile and easily worn. After being twisted with the tool multiple times, the sharp corners will gradually be worn into round shapes and lose the tool's driving ability.

[0073] If the support surface 21 is formed by directly connecting multiple adjacent arc surfaces, the smooth transition of the arc surfaces allows the stress to be distributed more evenly. Although it has certain advantages in terms of wear resistance, the smooth transition of the arc surfaces also makes the force transmission path more dispersed. As a result, under the same external force, the fastener is subjected to poor force along the rotation direction of the central axis. That is, during the process of tightening or loosening the fastener, relative slippage between the fastener and the tool is likely to occur, which affects the fastener installation and removal experience to a certain extent.

[0074] The first arc surface 211 of the above-mentioned technical solution is located at the end of the support surface 21. The smooth transition of the first arc surface 211 allows for a more uniform stress distribution, reducing local stress concentration caused by sharp angles or abrupt geometric changes, and improving the fatigue resistance of the support surface 21. Two straight surfaces 212 are located on either side of the first arc surface 211 along the circumferential Y direction of the fastener. The straight surfaces 212 provide a stable force-bearing area, thereby optimizing the force transmission path and more efficiently transmitting external torque to the thread 10. This results in better force distribution along the rotational direction of the central axis of the fastener, facilitating its installation and removal. Thus, by designing the support surface 21 of the fastener as a combination of an arc surface and a straight surface 212, both the service life and stress resistance of the fastener can be improved.

[0075] In some embodiments, the number of support surfaces 21 is multiple, and the multiple support surfaces 21 are arranged along the circumferential Y direction.

[0076] For example, the support surface 21 may be, but is not limited to, two, three, four, five, six or more.

[0077] Multiple support surfaces 21 can share the external force, thereby further improving the service life and reliability of the fastener.

[0078] In some embodiments, among two adjacent support surfaces 21, there is an included angle S between the flat surface 212 of one support surface 21 and the flat surface 212 of the other adjacent support surface 21. The included angle S and the number N of support surfaces 21 satisfy the following relationship: 360° / N≤S≤210°, N≥2, and N is an integer.

[0079] By way of example, in order to clearly describe the technical solution of the embodiments of this application, two adjacent support surfaces 21 are referred to as the first support surface and the second support surface, the two flat surfaces 212 of the first support surface 21 are referred to as the first flat surface and the second flat surface, and the two flat surfaces 212 of the second support surface 21 are referred to as the third flat surface and the fourth flat surface. The second flat surface and the third flat surface are adjacent and opposite to each other along the circumferential Y direction of the fastener, and the included angle S is the included angle between the second flat surface and the third flat surface.

[0080] Understandably, during the tightening or loosening of the fastener by the tool, the tangential component of the force exerted by the tool on the flat surface 212 along the circumferential Y direction of the fastener is the main driving force for rotating the fastener along its central axis. Given a fixed magnitude of the force exerted by the tool on the flat surface 212, the included angle S affects the magnitude of this tangential component. An angle S that is too large or too small can easily result in an insufficient tangential component.

[0081] As an example, when N is 2, the included angle S can be, but is not limited to, 180°, 190°, 200°, 210°, etc.

[0082] By setting the included angle S within the aforementioned range, the above-described technical solution reduces the risk of insufficient tangential force used to drive the fastener to rotate along the central axis due to the force exerted by the tool on the flat surface 212. This helps improve torque transmission efficiency, thereby optimizing the stress distribution of the fastener and making it easier to install and remove. Furthermore, introducing the flat surface 212 into the support surface 21 also reduces the design and fabrication difficulty of the included angle S.

[0083] In some embodiments, the included angle S and the quantity N satisfy the relationship: 360° / N≤S≤150°, N≥3. This can further improve the stress resistance of the fastener.

[0084] As an example, when N is 3, the included angle S can be, but is not limited to, 120°, 130°, 140°, 150°, etc.

[0085] As an example, when N is 4, the included angle S can be, but is not limited to, 90°, 100°, 110°, 120°, 130°, 140°, 150°, etc.

[0086] As an example, when N is 6, the included angle S can be, but is not limited to, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, etc.

[0087] Figure 4 This is a schematic diagram of the projection structure of the outer peripheral surface of a fastener along the axial direction X, provided in some embodiments of this application.

[0088] Continue to refer to Figure 4 In some embodiments, the outer peripheral surface has a first projection along the axial direction X, and the geometric center of the first projection passes through the axis of the thread 10. The maximum distance r1 from the geometric center to the first projection, the minimum distance r2 from the geometric center to the first projection, and the nominal diameter D of the thread 10 satisfy the relationship: 0.1≤(r1-r2) / D≤0.85.

[0089] For example, the difference between the maximum distance r1 from the geometric center of the first projection to the first projection and the minimum distance r2 from the geometric center of the first projection to the first projection can characterize the thickness of the portion corresponding to the support surface 21 of the support portion 20, that is, the thickness of the portion of the fastener available for tool wear during the process of the tool tightening or loosening the fastener. Theoretically, when the thickness of the portion of the fastener available for tool wear is zero, the fastener will lose its tool driving capability.

[0090] Understandably, the larger the maximum distance r1 and the minimum distance r2, the greater the thickness of the portion of the fastener available for tool wear, resulting in a longer service life and a larger fastener size. Conversely, the smaller the maximum distance r1 and the minimum distance r2, the smaller the thickness of the portion of the fastener available for tool wear, resulting in a shorter service life and a smaller fastener size.

[0091] Generally speaking, the nominal diameter D of the thread 10 affects the force required to tighten or loosen the fastener. A larger nominal diameter D typically requires more force to tighten or loosen the fastener; conversely, a smaller nominal diameter D typically requires less force. Therefore, a larger nominal diameter D necessitates a thicker portion of the fastener available for tool wear to ensure a longer service life.

[0092] As an example, (r1-r2) / D can be, but is not limited to, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.85, etc.

[0093] With a fixed nominal diameter D of thread 10, limiting (r1-r2) / D to greater than or equal to 0.1 increases the thickness of the tool wear portion of the fastener, thereby improving its service life. Limiting (r1-r2) / D to less than or equal to 0.85 reduces the amount of support portion 20 used, decreases the size of the fastener, and helps reduce the space occupancy and cost of the fastener.

[0094] The above technical solution can improve the service life of fasteners while reducing their space occupancy and cost.

[0095] In some embodiments, the maximum distance r1 from the geometric center to the first projection, the minimum distance r2 from the geometric center to the first projection, and the nominal diameter D of the thread 10 satisfy the relationship: 0.15≤(r1-r2) / D≤0.6. This can further optimize the service life of fasteners and balance the reduction of fastener space occupancy and cost.

[0096] As an example, (r1-r2) / D can be, but is not limited to, 0.15, 0.25, 0.35, 0.45, 0.55, 0.6, etc.

[0097] In some embodiments, the maximum distance r1 from the geometric center to the first projection and the minimum distance r2 from the geometric center to the first projection satisfy the relationship: 1.5mm ≤ r1 - r2 ≤ 20mm. This can improve the service life of fasteners while reducing their space occupancy and cost.

[0098] As an example, r1-r2 can be, but is not limited to, 1.5mm, 2mm, 5mm, 10mm, 12mm, 15mm, 18mm, 20mm, etc.

[0099] In some embodiments, the maximum distance r1 from the geometric center to the first projection and the minimum distance r2 from the geometric center to the first projection satisfy the relationship: 3mm≤r1-r2≤10mm.

[0100] As an example, r1-r2 can be, but is not limited to, 3mm, 3.5mm, 4mm, 4.5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc.

[0101] In some embodiments, the support portion 20 further includes a transition surface 22, the support surface 21 and the transition surface 22 are arranged along the circumferential Y direction, and the flat surface 212 is connected between the first arc surface 211 and the transition surface 22.

[0102] For example, during the process of the tool tightening or loosening the fastener, the transition surface 22 refers to the portion of the outer peripheral surface of the support portion 20 that is not used to receive torque from the tool and transmit torque to the thread 10. However, the transition surface 22 may also incidentally receive torque from the tool and transmit torque to the thread 10, even if the transition surface 22 is not intended for this purpose.

[0103] The transition surface 22 connects to two adjacent support surfaces 21, and the transition surface 22 connects to the flat surface 212 of the two adjacent support surfaces 21.

[0104] As an example, when there are multiple support surfaces 21, the transition surface 22 connects two adjacent support surfaces 21, such that the multiple support surfaces 21 are not adjacent to each other.

[0105] As an example, transition surface 22 can be flat.

[0106] As an example, the transition surface 22 may extend the entire axial X length of the support portion 20.

[0107] Optionally, the transition surface 22 can be a curved surface or a flat surface.

[0108] The above technical solution introduces a transition surface 22, so that the transition surface 22 does not bear the force from the tool during the process of tightening or loosening the fastener. Therefore, the thickness of the part corresponding to the transition surface 22 of the support part 20 can be appropriately reduced, which helps to reduce the amount of support part 20 used and can reduce the space occupation rate and cost of the fastener.

[0109] In some embodiments, the transition surface 22 is a second arcuate surface that is bent inward in a direction perpendicular to the axial direction X.

[0110] The second arc surface is curved inward in a direction perpendicular to the axial direction X. For example, the inward curvature can also be understood as curving in a direction close to the geometric center of the support portion 20.

[0111] The above technical solution sets the transition surface 22 as a second arc surface, which can not only further reduce the uniformity of stress distribution of the support part 20 as a whole and improve the service life of the fastener through the smooth transition of the second arc surface, but also help to further reduce the thickness of the part corresponding to the transition surface 22 of the support part 20, thereby reducing the space occupation rate and cost of the fastener.

[0112] In some embodiments, the arc R of the first arc surface 211 is: 1mm≤R≤25mm.

[0113] As an example, the radius R of the first arc surface 211 can be, but is not limited to, 1mm, 5mm, 10mm, 15mm, 20mm, 25mm, etc.

[0114] It is understandable that the curvature R of the first arc surface 211 can affect the overall smoothness of the first arc surface 211.

[0115] During the process of tightening or loosening the fastener, the tangential component of the force exerted by the tool on the first arc surface 211 along the circumferential Y direction of the fastener is the main power driving the fastener to rotate along the central axis. When the magnitude of the force exerted by the tool on the first arc surface 211 is constant, the curvature R of the first arc surface 211 will affect the magnitude of the aforementioned tangential component.

[0116] Limiting the curvature R of the first arc surface 211 to greater than or equal to 1 mm increases its smoothness, reduces the risk of stress concentration, and improves the fatigue resistance of the support surface 21. Limiting the curvature R of the first arc surface 211 to less than or equal to 25 mm can, to some extent, reduce the risk of insufficient tangential force used to drive the fastener to rotate along the central axis, thus improving torque transmission efficiency and optimizing the stress distribution of the fastener, making it easier to install and remove.

[0117] Thus, by setting the curvature R of the first arc surface 211 within the aforementioned range, the above-mentioned technical solution can simultaneously improve the service life and stress resistance of the fastener.

[0118] In some embodiments, the curvature R of the first arc surface 211 is: 3mm ≤ R ≤ 5mm. This effectively improves the stress resistance and service life of the fastener.

[0119] Figure 5 This is a top view of another fastener provided in some embodiments of this application.

[0120] Continue to refer to Figure 5 In some embodiments, the support portion 20 may include three support surfaces 21, which are arranged along the circumferential Y direction.

[0121] Figure 6 This is a top view of another fastener provided in some embodiments of this application.

[0122] Continue to refer to Figure 6 In some embodiments, the support portion 20 may include four support surfaces 21, which are arranged along the circumferential Y direction.

[0123] In some embodiments, the support portion 20 is provided with a through hole 30, which extends through the support portion 20 along the axial direction X of the fastener. The thread 10 includes an internal thread, which is disposed within the through hole 30.

[0124] In this embodiment, the fastener can be a nut, and the support portion 20 can be understood as the nut body.

[0125] Figure 7 This is a top view schematic diagram of another fastener provided in some embodiments of this application. Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure along BB.

[0126] Continue to refer to Figures 7 to 8 In some embodiments, the fastener further includes a shank 40 connected to the support portion 20. The thread 10 includes an external thread disposed on the shank 40.

[0127] In this embodiment, the fastener can be a bolt, the support portion 20 can be understood as the bolt head, and the rod portion 40 can be understood as the bolt rod.

[0128] In some embodiments, the support portion 20 includes six support surfaces 21, which are arranged along the circumferential Y direction.

[0129] Commercially available standard sockets and other tools are generally hexagonal. When no specially designed sockets or tools for this application embodiment are available, a slightly larger standard socket can be temporarily used to drive the rotation of the fasteners in this application embodiment. Thus, the above technical solution improves the applicability and ease of use of the fasteners in this application embodiment.

[0130] In some embodiments, the support surface 21 is configured to receive torque from a standard sleeve tool and transmit the torque to the thread 10.

[0131] In some embodiments, the projection shape of the outer peripheral surface of the support portion 20 along the axial direction X is a quincunx shape, wherein the quincunx shape may have, but is not limited to, three, four, five, or six petals. The support surface is located on the petals.

[0132] According to some embodiments of this application, this application also provides a battery device including fasteners of any of the above solutions.

[0133] According to some embodiments of this application, this application also provides an electrical device, including a battery device of any of the above schemes, the battery device being used to store or provide electrical energy.

[0134] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. All technical features and optional technical features of this application can be combined to form new technical solutions.

[0135] To better understand the fasteners provided in the embodiments of this application, based on the same inventive concept, embodiments of the above fasteners in practical applications are described herein.

[0136] This application provides a fastener including a thread 10 and a support portion 20. The support portion 20 is connected to the thread 10. The outer peripheral surface of the support portion 20 includes six support surfaces 21 and six transition surfaces 22. The transition surfaces 22 are connected between two adjacent support surfaces 21.

[0137] The support surface 21 is configured to receive external torque and transmit it to the thread 10. Each support surface 21 includes a first arcuate surface 211 and two straight surfaces 212. The first arcuate surface 211 is curved outward in a direction perpendicular to the axial direction X of the fastener. The two straight surfaces 212 are respectively connected to the two ends of the first arcuate surface 211 along the circumferential direction Y of the fastener. The curvature R of the first arcuate surface 211 is 3mm ≤ R ≤ 5mm. The transition surface 22 is a second arcuate surface that is curved inward in a direction perpendicular to the axial direction X.

[0138] In two adjacent support surfaces 21, the flat surface 212 of one support surface 21 has an included angle S with the flat surface 212 of the other support surface 21, and the included angle S and the number N of support surfaces 21 satisfy the relationship: 60°≤S≤150°.

[0139] In battery swapping stations, the fasteners provided in the embodiments of this application can be used. For vehicles with battery swapping capabilities, battery swapping needs to be performed at battery swapping stations. Therefore, the batteries of vehicles with battery swapping capabilities can be fixed using the fasteners provided in the embodiments of this application. The fasteners provided in the embodiments of this application have the advantages of long service life and good stress resistance, which can overcome the problem of easy failure caused by frequent installation and removal to a certain extent.

[0140] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0141] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A fastener, characterized in that, include: Thread; A support portion is connected to the thread. The outer peripheral surface of the support portion includes a support surface, which is configured to receive external torque and transmit torque to the thread. The support surface includes a first arc surface and two flat surfaces. The first arc surface is curved outward in a direction perpendicular to the axial direction of the fastener. The two flat surfaces are respectively connected to the two ends of the first arc surface along the circumference of the fastener.

2. The fastener according to claim 1, characterized in that, The number of the support surfaces is multiple, and the multiple support surfaces are arranged along the circumferential direction.

3. The fastener according to claim 2, characterized in that, In two adjacent support surfaces, the flat surface of one support surface has an included angle S with the flat surface of the other adjacent support surface, and the included angle S and the number of support surfaces N satisfy the following relationship: 360° / N≤S≤210°, N≥2, and N is an integer.

4. The fastener according to claim 3, characterized in that, The included angle S and the quantity N satisfy the following relationship: 360° / N≤S≤150°, N≥3.

5. The fastener according to claim 1, characterized in that, The outer peripheral surface has a first projection along the axial direction, and the geometric center of the first projection passes through the axis of the thread; The maximum distance r1 from the geometric center to the first projection, the minimum distance r2 from the geometric center to the first projection, and the nominal diameter D of the thread satisfy the relationship: 0.1≤(r1-r2) / D≤0.

85.

6. The fastener according to claim 5, characterized in that, The maximum distance r1 from the geometric center to the first projection, the minimum distance r2 from the geometric center to the first projection, and the nominal diameter D of the thread satisfy the relationship: 0.15≤(r1-r2) / D≤0.

6.

7. The fastener according to claim 5, characterized in that, The maximum distance r1 from the geometric center to the first projection and the minimum distance r2 from the geometric center to the first projection satisfy the following relationship: 1.5mm ≤ r1 - r2 ≤ 20mm.

8. The fastener according to claim 7, characterized in that, The maximum distance r1 from the geometric center to the first projection and the minimum distance r2 from the geometric center to the first projection satisfy the following relationship: 3mm ≤ r1 - r2 ≤ 10mm.

9. The fastener according to claim 1, characterized in that, The support portion further includes a transition surface, the support surface and the transition surface are arranged along the circumferential direction, and the flat surface is connected between the first arc surface and the transition surface.

10. The fastener according to claim 9, characterized in that, The transition surface is a second arc surface that is curved inward in a direction perpendicular to the axis.

11. The fastener according to claim 1, characterized in that, The curvature R of the first arc surface is: 1mm≤R≤25mm.

12. The fastener according to claim 11, characterized in that, The curvature R of the first arc surface is: 3mm≤R≤5mm.

13. The fastener according to claim 1, characterized in that, The support portion is provided with a through hole, which penetrates the support portion along the axial direction; The thread includes an internal thread, which is disposed within the through hole.

14. The fastener according to claim 1, characterized in that, The fastener also includes a rod portion connected to the support portion; The thread includes an external thread, which is disposed on the rod portion.

15. The fastener according to any one of claims 1-14, characterized in that, The support portion includes six support surfaces, which are arranged along the circumferential direction.

16. A battery device, characterized in that, Including the fasteners as described in any one of claims 1-15.

17. An electrical device, characterized in that, Includes the battery device as described in claim 16, the battery device being used to store or provide electrical energy.

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