Locking device, connection structure and power consuming device

Abstract

The embodiments of the present application provide a locking device, a connection structure, and a power consuming device. The locking device includes a housing including a first wall in which a first opening is provided, a bolt provided in the housing and penetrating through the first opening, a sleeve provided in the housing and fitted on the bolt, circumferentially locked with the bolt and relatively movable in the axial direction, a limit member fixed to the housing and preventing the sleeve from being removed from the housing along a direction away from the first wall, and an elastic member provided in the housing and used to apply an elastic force along the axial direction to the sleeve so that the sleeve is joined with the limit member, and configured to lock the sleeve in the circumferential direction when joined with the sleeve, where both ends of the elastic member abut against the first wall and the sleeve, respectively. This locking device can reduce the installation space occupied and can be applied to different installation environments.

Description

[Technical Field]

[0001] The present application relates to the field of battery assembly technology, and in particular to locking devices, connection structures and power consumption devices. [Background technology]

[0002] With the development of new energy vehicles, in order to realize quick assembly and disassembly of batteries, a locking device is generally adopted to fix the battery.

[0003] In the prior art, the locking device occupies a relatively large installation space and has relatively high requirements for the installation environment. Summary of the Invention [Problem to be solved by the invention]

[0004] The purpose of this application is to provide a locking device, a connecting structure and a power consuming device, which can reduce the installation space and can be applied to different installation environments. [Means for solving the problem]

[0005] The present application is realized by the following technical solution:

[0006] According to a first aspect, the present application provides a locking device, the locking device comprising: a housing including a first wall in which the first opening is located; a bolt disposed within the housing and extending through the first opening; a sleeve that is installed in the housing and fitted onto the bolt, and that is locked with the bolt in a circumferential direction and is movable relative to the bolt in an axial direction; a limit member fixed to the housing for preventing the sleeve from being removed from the housing in a direction away from the first wall; an elastic member that is installed in the housing and is used to apply an elastic force along the axial direction to the sleeve so that the sleeve is joined with the limit member, and that is configured to lock the sleeve in a circumferential direction when joined with the sleeve; Here, both ends of the elastic member abut against the first wall and the sleeve, respectively.

[0007] In the locking device according to the embodiment of the present application, in an initial state, the sleeve is engaged with the limit member by the elastic force of the elastic member. The limit member is configured to lock the sleeve in the circumferential direction when engaged with the sleeve, preventing the sleeve, coupled with the limit member, from detaching from the housing in a direction away from the first wall. The sleeve and the bolt are confined within the housing, and when the bolt is connected to the nut, the sleeve and the bolt are driven to move axially toward the first wall relative to the housing, thereby separating the sleeve and the limit member. The connection between the bolt and the nut can be achieved by twisting the sleeve and the bolt. Once the bolt is connected to the nut, the rotational force applied to the sleeve is removed, and the sleeve moves axially relative to the bolt by the elastic force of the elastic member until the sleeve is engaged with the limit member and is locked in the circumferential direction by the limit member. The circumferential locking of the sleeve with respect to the bolt is achieved because the sleeve is locked in the circumferential direction. In prior art, the elastic member is installed between the flange surface of the bolt and the sleeve, resulting in a relatively large axial size of the locking device and therefore occupying a relatively large installation space. In the embodiment of the present application, the elastic member is installed between the first wall and the sleeve, and the axial space within the housing is utilized rationally, thereby reducing the axial size of the bolt, and thereby allowing the locking device to be designed with a relatively small axial size, thereby reducing the installation space it occupies and adapting to different installation environments.

[0008] According to some embodiments of the present application, the bolt includes a threaded portion, a first transmission portion, and a locking portion, which are distributed in sequence along the axial direction, the first transmission portion and the sleeve are engaged in transmission engagement, the locking portion and the sleeve are engaged in circumferential locking engagement, and the cross-sectional area of the first transmission portion is larger than the cross-sectional area of the locking portion.

[0009] In the above solution, the connection between the bolt and the nut is realized by the threaded portion, facilitating assembly and disassembly. The first transmission part is engaged with the sleeve, and the cross-sectional area of the first transmission part is larger than that of the locking part. As a result, the maximum torque that the first transmission part can withstand is greater than the maximum torque that the locking part can withstand, improving the maximum torque that the bolt can withstand and ensuring the robustness of the connection between the locking device and the nut. The locking part is engaged with the sleeve in a circumferential locking manner, and the sleeve prevents the bolt from loosening. When the sleeve is locked in the circumferential direction, the sleeve can limit the rotation of the bolt.

[0010] According to some embodiments of the present application, the sleeve includes a sleeve body and a first flange extending radially from one end of the sleeve body, the sleeve body is fitted into the locking portion and is circumferentially lockingly engaged with the locking portion, a second transmission portion corresponding to the first transmission portion is installed on the first flange, the second transmission portion is used to be engaged with the first transmission portion, and the elastic member abuts against the first flange.

[0011] In the above solution, the first flange is installed at one end of the sleeve body, which facilitates contact with the elastic member and withstands the elastic force applied by the elastic member, while facilitating the installation of the second transmission part, realizing engagement with the first transmission part, and ensuring the stability of the transmission engagement between the sleeve and the bolt.

[0012] According to some embodiments of the present application, the bolt further includes a second flange, the second flange and the first flange are axially opposed to each other, the threaded portion and the locking portion are located on both sides of the second flange, and the first transmission portion is installed on the second flange.

[0013] In the above solution, the second flange and the first flange are axially opposed to each other, facilitating engagement between the first transmission part and the second transmission part. The threaded portion and the locking portion are located on both sides of the second flange, and the second flange can be brought closer to the first wall, provided that the required length of the threaded portion is met. After the first transmission part is engaged with the second transmission part and the second flange is brought closer to the first wall, the distance between the sleeve and the first wall can be reduced, reducing the axial size of the bolt, further reducing the axial size of the locking device and reducing the installation space it occupies.

[0014] According to some embodiments of the present application, one of the first transmission part and the second transmission part is a protrusion shape, and the other is a recess matching the protrusion shape.

[0015] In the above solution, the engagement method between the protrusion shape and the groove makes the contact area between the first transmission part and the second transmission part relatively large, thereby ensuring the stability of the engagement between the first transmission part and the second transmission part.

[0016] According to some embodiments of the present application, the first transmission part and the second transmission part are in a splined engagement.

[0017] In the above solution, the spline engagement has better supporting capacity and can allow the first and second transmission parts to move relative to each other in the axial direction. After the bolt and the nut are connected and fixed, the sleeve can be separated from the first transmission part by the elastic force of the elastic member, so that the sleeve is connected to the limiting member and realizes circumferential locking with respect to the bolt.

[0018] According to some embodiments of the present application, the outer circumferential surface of the sleeve body is a polygonal cylindrical surface.

[0019] In the above solution, the polygonal cylindrical surface facilitates engagement with tools, facilitates power transmission, twists the sleeve and bolt, and realizes the connection and engagement between the bolt and nut, improves assembly efficiency, and is convenient for processing and manufacturing.

[0020] According to some embodiments of the present application, the inner peripheral surface of the sleeve body and the outer peripheral surface of the locking portion are both polygonal cylindrical surfaces.

[0021] In the above solution, the polygonal cylindrical surface engagement between the inner peripheral surface of the sleeve body and the outer peripheral surface of the locking part can increase the friction force between the sleeve body and the locking part, resulting in a better circumferential locking effect and facilitating processing and manufacturing.

[0022] According to some embodiments of the present application, a plurality of first teeth distributed along a circumferential direction are provided on the sleeve, and a plurality of second teeth distributed along a circumferential direction are provided on the limit member, and the plurality of second teeth are used to mesh with the plurality of first teeth to lock the sleeve in a circumferential direction.

[0023] In the above solution, the engagement between the first teeth and the second teeth simplifies the structure, effectively prevents the sleeve from rotating relative to the limiting member, and provides a better circumferential locking effect.

[0024] According to some embodiments of the present application, the housing further includes a second wall, the second wall is disposed around the first wall, one end of the second wall is connected to an edge of the first wall, and the other end of the second wall defines a second opening facing the first wall, and the limit member is disposed in the second opening.

[0025] In the above solution, the second wall and the first wall define an internal space of the housing, and the end of the second wall away from the first wall defines a second opening, so that the sleeve and elastic member can be easily installed inside the housing.

[0026] According to some embodiments of the present application, a plurality of third teeth distributed circumferentially are provided on the outer peripheral surface of the limit member, and a plurality of fourth teeth distributed circumferentially are provided on the inner surface of the second wall, and the plurality of third teeth mesh with the plurality of fourth teeth, thereby locking the limit member circumferentially.

[0027] In the above solution, the third tooth and the fourth tooth are meshed to simplify the structure, effectively restrict the limit member from rotating relative to the housing, and ensure a circumferential locking effect for the limit member.

[0028] According to some embodiments of the present application, a stepped surface is formed on the inner surface of the second wall, and the locking device further includes a locking spring, wherein the side of the limit member facing the first wall abuts against the stepped surface and the side of the limit member facing away from the first wall abuts against the locking spring, thereby locking the limit member in the axial direction.

[0029] In the above solution, the engagement between the step surface and the locking spring restricts the movement of the limiting member along the axial direction, and the assembly and removal of the locking spring is facilitated, thereby ensuring the axial limit and improving the efficiency of assembly and maintenance.

[0030] According to a second aspect, the present application further provides a connection structure, the connection structure comprising: a first substrate; a second substrate; and a nut fixed to the first base; and a locking device in the above embodiment, wherein the locking device is fixed to the second base, and the bolt of the locking device is connected to the nut to lock the second base to the first base.

[0031] The connection structure of the embodiment of the present application allows the second base to be locked to the first base by the connection and engagement of the bolt and nut of the locking device, making it easy to assemble and disassemble, and improving assembly and maintenance efficiency.

[0032] According to some embodiments of the present application, an accommodating cavity is provided in the second base, the housing of the locking device is provided in the accommodating cavity, a through hole is provided in the inner wall of the accommodating cavity, the housing further includes a boss, the boss is formed on the outer surface of the first wall and is provided surrounding the first opening, the boss is inserted into the through hole and is tight-fitted into the through hole.

[0033] In the above solution, the boss is inserted into the through hole on the inner wall of the receiving cavity and tightly fitted into the through hole, thereby increasing the connection area between the housing and the second base and making it easier to ensure the connection strength between the housing and the second base.

[0034] According to some embodiments of the present application, a plurality of fifth teeth are provided on the outer peripheral surface of the boss, the fifth teeth being distributed along the circumferential direction.

[0035] In the above solution, the interference fit between the plurality of fifth teeth and the through holes provides a better anti-rotation effect, further improving the connection strength between the housing and the second substrate.

[0036] According to some embodiments of the present application, the housing is a rectangular housing, and the shape of the receiving cavity matches the shape of the housing.

[0037] In the above solution, the square housing type can prevent the housing from rotating relative to the second substrate, and has a better anti-rotation effect.

[0038] According to a third aspect, the present application further provides a power consuming device, the power consuming device comprising: The device body, Batteries and The connecting structure in the above embodiment includes the first base fixed to the device body, and the second base fixed to the battery.

[0039] The above description is merely a summary of the technical solution of the present application, which can be implemented in accordance with the contents of the specification in order to more clearly understand the technical solution of the present application, and to make the above and other objectives, features and advantages of the present application more obvious and understandable, the following particularly cites specific embodiments of the present application for description. [Brief explanation of the drawings]

[0040] In order to more clearly explain the technical solutions of the embodiments of the present application, the following briefly introduces the drawings that need to be used in the embodiments of the present application. It is obvious that the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on the drawings without exerting any creative efforts. [Figure 1] FIG. 1 is an exploded view of a locking device according to some embodiments of the present application. [Figure 2] 1 is a cross-sectional view of a locking device according to some embodiments of the present application. [Figure 3] 1 is a structural schematic diagram of a bolt according to some embodiments of the present application. FIG. [Figure 4] 1 is a schematic structural diagram of a sleeve according to some embodiments of the present application; [Figure 5] 2 is a second schematic structural diagram of a sleeve according to some embodiments of the present application. [Figure 6] 1 is a structural schematic diagram of a limit member according to some embodiments of the present application; [Figure 7]1 is a cross-sectional view of a housing according to some embodiments of the present application. [Figure 8] 1 is a structural schematic diagram of a locking spring according to some embodiments of the present application; [Figure 9] 1 is an exploded view of a connection structure according to some embodiments of the present application. [Figure 10] 1 is a cross-sectional view of a connection structure according to some embodiments of the present application. [Figure 11] 1 is a structural schematic diagram of a second substrate according to some embodiments of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0041] The following describes in detail the embodiments of the technical solution of the present application in conjunction with the drawings. The following embodiments are for the purpose of more clearly explaining the technical solution of the present application, and are merely illustrative and do not limit the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art of this application, and the terms used herein are only for describing specific embodiments and are not intended to limit this application. The terms "comprises" and "having" and any variations thereof in the specification and claims of this application and the description of the drawings above are intended to cover a non-exclusive "comprise."

[0043] In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used only for the purpose of distinguishing different objects, and are not understood to indicate or imply relative importance, or to imply the number, specific order, or hierarchical relationship of the indicated technical features. In the description of the embodiments of the present application, unless otherwise specified and specifically limited, "plurality" means two or more.

[0044] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. Appearances of this phrase in various locations throughout the specification do not necessarily refer to the same embodiment, nor are they mutually exclusive, independent, or alternative embodiments. Those skilled in the art can explicitly or implicitly understand that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments of this application, the term "and / or" merely describes the relationship between related objects and indicates that three relationships may exist. For example, A and / or B can represent three cases: A alone, a combination of A and B, and B alone. In addition, the character " / " in this specification generally indicates that the related objects before and after are in an "or" relationship.

[0046] In describing the embodiments of the present application, the term "plurality" refers to two or more (including two); similarly, "sets" refers to two or more (including two sets); and "plurality" refers to two or more (including two).

[0047] In describing the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center," "longitudinal direction," "lateral direction," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are orientations or positional relationships shown based on the drawings, and are intended merely for the convenience and simplification of the description of the embodiments of the present application. They do not indicate or imply that the referred devices or elements must have a specific orientation or be configured and operated in a specific orientation, and should not be understood as limiting the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise clearly defined or limited, the technical terms "attached," "connected," "connected," "fixed," etc. should be understood in a broad sense, and may refer to, for example, fixed connection, detachable connection, or integration, mechanical connection, electrical connection, direct connection, indirect connection via an intermediate medium, internal communication between two elements, or an interactive relationship between two elements. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific circumstances.

[0049] Currently, new energy vehicles often adopt quick-change connection structures in the assembly process to improve assembly and maintenance efficiency. For example, the battery is generally fixed to the vehicle body using a locking device.

[0050] In the prior art, locking devices occupy a relatively large installation space and place high requirements on the installation environment. The inventor found that the reason for the large installation space of the locking device is the relatively large axial size of the bolt. Through further research, the inventor found that the bolt of the locking device is provided with a radially protruding flange surface, the flange surface and the sleeve are axially opposite each other, and an elastic member in the housing of the locking device is installed between the flange surface of the bolt and the sleeve, resulting in a relatively large distance between the flange surface of the bolt and the sleeve, which makes the axial size of the bolt relatively large, the distance between the sleeve and the threaded portion of the bolt relatively large, and the axial size of the locking device relatively large. Therefore, the locking device occupies a relatively large installation space during the assembly process and places high requirements on the installation environment.

[0051] In view of this, and to solve the problems of a locking device occupying a relatively large installation space and imposing relatively high requirements on the installation environment, the inventor conducted extensive research and designed a locking device. The locking device includes a housing, a bolt, a sleeve, a limiting member, and an elastic member. The housing includes a first wall, and a first opening is formed in the first wall. The bolt is disposed within the housing and protrudes through the first opening. The sleeve is disposed within the housing and fitted over the bolt, and is circumferentially locked with the bolt and axially movable relative to the bolt. The limiting member is fixed to the housing and is used to prevent the sleeve from separating from the housing in a direction away from the first wall. The elastic member is disposed within the housing and is used to apply an elastic force along the axial direction to the sleeve so that the sleeve is joined with the limiting member. The limiting member locks the sleeve circumferentially when joined with the sleeve. Both ends of the elastic member abut against the first wall and the sleeve, respectively.

[0052] In this locking device, in an initial state, the sleeve is engaged with the limit member by the action of the elastic force of the elastic member, and the limit member is configured to lock the sleeve in the circumferential direction when engaged with the sleeve, preventing the sleeve, coupled with the limit member, from being removed from the housing in a direction away from the first wall. The sleeve and the bolt are limited within the housing, and when the bolt is connected to the nut, the sleeve and the bolt are driven to move axially toward the first wall relative to the housing, separating the sleeve and the limit member. After the sleeve and the limit member are separated, the bolt is connected to the nut by twisting the sleeve and the bolt. When the bolt is connected to the nut, the force applied to the sleeve is removed, and the sleeve moves axially by the action of the elastic force of the elastic member until it is engaged with the limit member. The limit member locks the sleeve in the circumferential direction, and the sleeve is locked circumferentially with the bolt, thereby achieving circumferential locking with respect to the bolt.

[0053] Since both ends of the elastic member abut against the first wall and the sleeve, respectively, the distance between the sleeve and the first wall is reduced, the internal space of the housing is utilized efficiently, and the axial size of the bolt can be reduced. As a result, the axial size of the locking device can be designed to be relatively small, the installation space it occupies is reduced, and it is adaptable to different installation environments.

[0054] The embodiments of the present application provide a locking device, which may be used in automobile assembly, for example, the assembly of a battery and a body of a new energy vehicle, but is not limited thereto, and may also be used in other assemblies between two components that require connection.

[0055] FIG. 1 is an exploded view of a locking device 100 according to some embodiments of the present application, and FIG. 2 is a cross-sectional view of the locking device 100 according to some embodiments of the present application. According to some embodiments of the present application, as shown in FIGS. 1 and 2, the present application provides a locking device 100, which includes a housing 10, a bolt 20, a sleeve 30, a limit member 40, and an elastic member 50. The housing 10 includes a first wall 11, and a first opening 111 is provided in the first wall 11. The bolt 20 is provided within the housing 10 and extends through the first opening 111. The sleeve 30 is provided within the housing 10 and fitted over the bolt 20, and is circumferentially locked with the bolt 20 and axially movable relative to the bolt 20. The limit member 40 is fixed to the housing 10 and is used to restrict the sleeve 30 from being removed from the housing 10 in a direction away from the first wall 11. The elastic member 50 is installed in the housing 10 and is used to apply an elastic force along the axial direction to the sleeve 30 so that the sleeve 30 is joined with the limit member 40. The limit member 40 is configured to lock the sleeve 30 in the circumferential direction when joined with the sleeve 30.

[0056] It should be noted that, because the sleeve 30 is fitted onto the bolt 20 and the bolt 20 is drilled into the first opening 111, the axis of the sleeve 30 overlaps with the axis of the bolt 20, and the axis of the bolt 20 overlaps with the axis of the first opening 111. For ease of description, the circumferential direction referred to in the embodiments of this application refers to the circumferential direction of the bolt 20, the axial direction refers to the axial direction of the bolt 20, and the radial direction refers to the radial direction of the bolt 20. Circumferential locking refers to restricting circumferential rotation, for example, restricting two members engaged with each other from rotating circumferentially relative to each other. Axial locking refers to restricting a member in the axial direction and restricting the axial movement of a member.

[0057] The first wall 11 refers to a member that constitutes the housing 10 and has a certain thickness.

[0058] The bolt 20 protruding from the first opening 111 means that most of the bolt 20 is located inside the housing 10 and one end of the bolt 20 protrudes from the housing 10 through the first opening 111 .

[0059] The sleeve 30 is fitted onto the bolt 20 and is circumferentially locked to the bolt 20. The engagement between the sleeve 30 and the bolt 20 restricts the bolt 20 from rotating in the circumferential direction relative to the sleeve 30. The ability of the sleeve 30 to move in the axial direction relative to the bolt 20 means that the sleeve 30 can move in the axial direction relative to the bolt 20. When the sleeve 30 overcomes the elastic force of the elastic member 50 and moves toward the first wall 11, the contact area between the sleeve 30 and the limit member 40 gradually decreases. After the sleeve 30 and the limit member 40 are separated, the sleeve 30 can rotate in the circumferential direction of the elastic member 50, releasing the circumferential lock on the sleeve 30.

[0060] The limit member 40 being fixed to the housing 10 refers to the limit member 40 being fixed relatively to a position on the housing 10. For example, the limit member 40 may be fixed to the housing 10 by a removable member, and after removing the removable member, the limit member 40 can be separated from the housing 10. The limit member 40 is used to prevent the sleeve 30 from separating from the housing 10 in a direction away from the first wall 11, and applies a blocking force to the sleeve 30 on the side of the sleeve 30 away from the first wall 11. The limit member 40 may be installed on the side of the sleeve 30 away from the first wall 11.

[0061] The elastic member 50 is fitted onto the outside of the bolt 20, and both ends of the elastic member 50 abut against the first wall 11 and the sleeve 30, respectively. The elastic member 50 is located on the side of the sleeve 30 facing the first wall 11, and is used to connect with the limit member 40 to prevent the sleeve 30 from being removed from the housing 10 in a direction away from the first wall 11. The elastic member 50 and the limit member 40 cooperate to limit the sleeve 30 in the axial direction.

[0062] In the locking device 100 according to the embodiment of the present application, in an initial state, the sleeve 30 is connected to the limit member 40 by the elastic force of the elastic member 50. The limit member 40 is configured to lock the sleeve 30 in the circumferential direction when connected to the sleeve 30, preventing the sleeve 30 connected to the limit member 40 from being removed from the housing 10 in a direction away from the first wall 11. The sleeve 30 and the bolt 20 are confined within the housing 10. When the bolt 20 is connected to the nut, the sleeve 30 and the bolt 20 are driven to move axially toward the first wall 11 relative to the housing 10, causing the sleeve 30 to press against the elastic member 50, gradually approaching the first wall 11. After the sleeve 30 and the limit member 40 are separated, the bolt 20 comes into contact with the nut, twisting the sleeve 30 and the bolt 20 and achieving connection between the bolt 20 and the nut. When the bolt 20 is connected to the nut, the rotational force applied to the sleeve 30 is removed, and the elastic force of the elastic member 50 causes the sleeve 30 to move axially relative to the bolt 20 until the sleeve 30 is engaged with the limit member 40. The sleeve 30 is locked in the circumferential direction by the limit member 40, and the sleeve 30 is locked in the circumferential direction relative to the bolt 20, thereby achieving circumferential locking relative to the bolt 20. In the prior art, the elastic member 50 is installed between the flange surface of the bolt 20 and the sleeve 30, which makes the size of the locking device 100 along the axial direction relatively large and occupies a relatively large installation space. In the embodiment of the present application, the elastic member 50 is installed between the first wall 11 and the sleeve 30, thereby reducing the distance between the sleeve 30 and the first wall 11 of the housing 10, making rational use of the axial space within the housing 10, and reducing the axial size of the bolt 20, so that the axial size of the locking device 100 can be designed to be relatively small, reducing the installation space it occupies, and adapting to different installation environments.

[0063] Figure 3 is a structural schematic diagram of a bolt 20 according to some embodiments of the present application, and combines Figures 1 and 2. According to some embodiments of the present application, optionally, as shown in Figures 1 to 3, the bolt 20 includes a threaded portion 21, a first transmission portion 22, and a locking portion 23, which are distributed in order along the axial direction, where the first transmission portion 22 and the sleeve 30 are in transmission engagement with each other, and the locking portion 23 and the sleeve 30 are in circumferential locking engagement with each other, and the cross-sectional area of the first transmission portion 22 is larger than the cross-sectional area of the locking portion 23.

[0064] The cross-sectional area refers to the projected area on a plane perpendicular to the axial direction of the bolt 20 of the member, for example, the cross-sectional area of the first transmission part 22 refers to the projected area on a plane perpendicular to the axial direction of the first transmission part 22, and the cross-sectional area of the locking part 23 refers to the projected area on a plane perpendicular to the axial direction of the locking part 23.

[0065] The power transmission engagement between the first transmission part 22 and the sleeve 30 refers to the fact that the circumferential rotational power transmission between the bolt 20 and the sleeve 30 is realized by the power transmission engagement between the first transmission part 22 and the sleeve 30. That is, an external force acts on the sleeve 30, and the acting force received by the sleeve 30 is transmitted to the first transmission part 22, driving the bolt 20 to rotate. For example, when the bolt 20 is driven to rotate, a driving force acts on the sleeve 30, and the sleeve 30 transmits the driving force to the first transmission part 22, driving the bolt 20 to rotate. When the first transmission part 22 is power transmission engaged with the sleeve 30, a circumferential locking can also be realized between the first transmission part 22 and the sleeve 30. That is, the first transmission part 22 can restrict the sleeve 30 from rotating relative to the bolt 20.

[0066] There is a circumferential locking engagement between the locking portion 23 and the sleeve 30, and the locking portion 23 is not involved in the power transmission necessary for the rotation of the bolt 20 between the bolt 20 and the sleeve 30, but rather is involved only in limiting the circumferential rotation between the bolt 20 and the sleeve 30.

[0067] The threaded portion 21 connects the bolt 20 and the nut, facilitating assembly and disassembly. The first transmission portion 22 is engaged with the sleeve 30, and the cross-sectional area of the first transmission portion 22 is greater than that of the locking portion 23. This makes the maximum torque that the first transmission portion 22 can withstand greater than the maximum torque that the locking portion 23 can withstand, improving the maximum torque that the bolt 20 can withstand and ensuring the robustness of the connection between the locking device 100 and the nut. The locking portion 23 is circumferentially engaged with the sleeve 30 in a locking manner, which prevents the bolt 20 from loosening. When the sleeve 30 is locked in the circumferential direction, the sleeve 30 can limit the rotation of the bolt 20.

[0068] FIG. 4 is a schematic structural diagram (top view) of a sleeve 30 according to some embodiments of the present application, and FIG. 5 is a schematic structural diagram (bottom view) of a sleeve 30 according to some embodiments of the present application. FIGS. 4 and 5 show the structure of the sleeve 30 from both axial sides. According to some embodiments of the present application, as shown in FIGS. 2, 4, and 5, the sleeve 30 optionally includes a sleeve body 31 and a first flange 32 extending radially from one end of the sleeve body 31. The sleeve body 31 is fitted into the locking portion 23 and is circumferentially locked with the locking portion 23. The first flange 32 is provided with a second transmission portion 33 corresponding to the first transmission portion 22. The second transmission portion 33 is used for transmission engagement with the first transmission portion 22. An elastic member 50 abuts against the first flange 32.

[0069] The first flange 32 is located at one end of the sleeve body 31 and protrudes radially from the sleeve body 31. In other words, the first flange 32 is connected to the outer circumferential surface of the sleeve body 31.

[0070] The second transmission part 33 is used for transmission engagement with the first transmission part 22, i.e., power transmission between the sleeve 30 and the bolt 20 is realized by engagement between the second transmission part 33 and the first transmission part 22.

[0071] The elastic member 50 abuts against the first flange 32. The first flange 32 is located at the end of the sleeve body 31 that is closest to the first wall 11, so that the second transmission part 33 is engaged with the first transmission part 22, reducing the size of the bolt 20 along the axial direction, and reducing the size of the locking device 100 along the axial direction.

[0072] The first flange 32 is installed at one end of the sleeve body 31, making it easy to abut against the elastic member 50 and receive the elastic force applied by the elastic member 50, while facilitating the installation of the second transmission part 33, realizing engagement with the first transmission part 22, and ensuring the stability of the transmission engagement between the sleeve 30 and the bolt 20.

[0073] 6 is a structural schematic diagram of a limit member 40 according to some embodiments of the present application. As shown in FIG. 6, the limit member 40 has an annular structure, and the sleeve body 31 penetrates the limit member 40 (see FIG. 2), whereby a tool acts on the sleeve body 31 to drive the sleeve 30 to rotate.

[0074] According to some embodiments of the present application, optionally, as shown in Figures 2 and 3, the bolt 20 further includes a second flange 24, the second flange 24 and the first flange 32 are axially opposed to each other, the threaded portion 21 and the locking portion 23 are located on both sides of the second flange 24, and the first transmission portion 22 is installed on the second flange 24.

[0075] The second flange 24 and the first flange 32 are axially opposed to each other and are arranged in sequence in the axial direction. The second flange 24 faces the first flange 32 so that the first transmission part 22 is engaged with the second transmission part 33.

[0076] The threaded portion 21 and the locking portion 23 are located on both sides of the second flange 24, which means that the second flange 24 separates the threaded portion 21 and the locking portion 23 in the axial direction. The first flange 32 is located at the end of the sleeve body 31 that is closest to the first wall 11, so that the distance between the first flange 32 and the second flange 24 is relatively short, and therefore the opposing surfaces of the first flange 32 and the second flange 24 can be attached to each other.

[0077] The second flange 24 and the first flange 32 face each other in the axial direction, facilitating engagement between the first transmission part 22 and the second transmission part 33. The threaded part 21 and the locking part 23 are located on both sides of the second flange 24, and the second flange 24 can be brought closer to the first wall 11, provided that the required axial length of the threaded part 21 is met. Due to the transmission engagement between the first transmission part 22 and the second transmission part 33, the second flange 24 is brought closer to the first wall 11, reducing the distance between the sleeve 30 and the first wall 11, reducing the axial size of the bolt 20, further reducing the axial size of the locking device 100, and reducing the installation space it occupies.

[0078] According to some embodiments of the present application, optionally, one of the first transmission part 22 and the second transmission part 33 is a protrusion shape, and the other is a recessed groove matching the protrusion shape.

[0079] The engagement manner of the first transmission part 22 and the second transmission part 33 may have two cases. One is that the first transmission part 22 has a protrusion shape and the second transmission part 33 has a groove, as shown in Figures 3 and 4. The other is that the first transmission part 22 has a groove and the second transmission part 33 has a protrusion shape. The protrusion shape matches the contour of the groove, and after the protrusion shape is inserted into the groove, the protrusion shape is engaged with the groove.

[0080] The engagement method between the protrusion shape and the groove makes the contact area between the first transmission part 22 and the second transmission part 33 relatively large, ensuring the stability of the engagement between the first transmission part 22 and the second transmission part 33.

[0081] In some embodiments, if the bolt 20 does not have the second flange 24 , the first transmission portion 22 may be a protruding portion on the bolt 20 .

[0082] According to some embodiments of the present application, optionally, the first transmission part 22 and the second transmission part 33 are splined together.

[0083] In an embodiment in which the first transmission part 22 has a protrusion shape and the second transmission part 33 has a groove shape, as shown in Figures 3 and 4, the first transmission part 22 has a flower-shaped protrusion shape and the second transmission part 33 has a flower-shaped groove shape, and the spline engagement can transmit a relatively large torque.

[0084] The engagement between the first transmission part 22 and the second transmission part 33 is spline engagement, which has better support capacity and allows the first transmission part 22 and the second transmission part 33 to move axially relative to each other. After the bolt 20 is connected to the nut and fixed, the sleeve 30 can move away from the first wall 11 due to the elastic force of the elastic member 50, and the second transmission part 33 gradually separates from the first transmission part 22. After the second transmission part 33 and the first transmission part 22 are separated, the sleeve 30 continues to move until it is connected to the limiting member 40, and after being connected to the limiting member 40, it achieves circumferential locking with respect to the bolt 20.

[0085] According to some embodiments of the present application, optionally, as shown in FIGS. 4 and 5, the outer peripheral surface of the sleeve body 31 is a polygonal cylindrical surface.

[0086] The polygonal cylindrical surface indicates that the outer peripheral surface of the sleeve body 31 is constituted by a plurality of cylindrical surfaces that are connected in order around the circumference to form a polygonal cylindrical structure.

[0087] The polygonal cylindrical surface facilitates engagement with tools, facilitates power transmission, twists the sleeve 30 and the bolt 20, and realizes the connection and engagement between the bolt 20 and the nut, improves assembly efficiency, and is convenient for processing and manufacturing.

[0088] Optionally, the outer peripheral surface of the sleeve body 31 is a hexagonal cylindrical surface having three pairs of opposing cylindrical surfaces to facilitate engagement of the sleeve body 31 with a tool.

[0089] According to some embodiments of the present application, optionally, as shown in FIGS. 3 and 4, the inner peripheral surface of the sleeve body 31 and the outer peripheral surface of the locking portion 23 are both polygonal cylindrical surfaces.

[0090] The sleeve body 31 is fitted into the locking portion 23, and the inner peripheral surface of the sleeve body 31 matches the outer peripheral surface of the locking portion 23. In other words, the shape of the inner peripheral surface of the sleeve body 31 matches the shape of the outer peripheral surface of the locking portion 23.

[0091] The engagement method between the inner peripheral surface of the sleeve body 31 and the polygonal cylindrical surface on the outer peripheral surface of the locking portion 23 increases the friction force between the sleeve body 31 and the locking portion 23, providing a better circumferential locking effect and facilitating processing and manufacturing.

[0092] Alternatively, the inner peripheral surface of the sleeve body 31 and the outer peripheral surface of the locking portion 23 are both hexagonal cylindrical surfaces, which is convenient for processing and manufacturing.

[0093] According to some embodiments of the present application, as shown in Figures 5 and 6, a plurality of first teeth 34 are selectively provided on the sleeve 30 and a plurality of second teeth 41 are selectively provided on the limit member 40. The plurality of second teeth 41 are used to mesh with the plurality of first teeth 34 to lock the sleeve 30 in the circumferential direction.

[0094] In an embodiment in which the sleeve 30 includes a sleeve body 31 and a first flange 32 extending radially from one end of the sleeve body 31, the plurality of first teeth 34 are provided on the first flange 32 and are located on the side of the first flange 32 facing the limit member 40, thereby meshing with the plurality of second teeth 41. In an embodiment in which the limit member 40 has an annular structure, the plurality of second teeth 41 are located on the inner circumferential surface of the limit member 40.

[0095] The meshing of the first teeth 34 and the second teeth 41 can simplify the structure and effectively prevent the sleeve 30 from rotating relative to the limit member 40, providing a better locking effect in the circumferential direction.

[0096] Optionally, the first teeth 34 and the second teeth 41 are both oblique teeth, which relatively increases the contact area between the sleeve body 31 and the limit member 40. As shown in FIGS. 5 and 6 , the plurality of first teeth 34 are located on the side of the first flange 32 that is away from the first wall 11, and the plurality of second teeth 41 are located on the inner circumferential surface of the limit member 40.

[0097] 7 is a cross-sectional view of the housing 10 according to some embodiments of the present application. Optionally, according to some embodiments of the present application, as shown in FIG. 7, the housing 10 further includes a second wall 12, the second wall 12 is disposed around the first wall 11, one end of the second wall 12 is connected to an edge of the first wall 11, and the other end of the second wall 12 defines a second opening 121 facing the first wall 11, and the limit member 40 (see FIG. 2) is disposed in the second opening 121.

[0098] The second wall 12 is installed around the first wall 11, and one end of the second wall 12 is connected to the edge of the first wall 11, and the inner surfaces of the first wall 11 and the second wall 12 define the internal space of the housing 10.

[0099] The limit member 40 is installed in the second opening 121. The limit member 40 may be located inside or outside the housing 10, as long as it prevents the sleeve 30 from being removed from the housing 10 through the second opening 121 in a direction away from the first wall 11.

[0100] The inner surface of the second wall 12 is a cylindrical surface, which allows the bolt 20 and sleeve 30 to rotate within the housing 10.

[0101] The first opening 111 and the second opening 121 are both circular, and the diameter of the second opening 121 is larger than the diameter of the first opening 111. As a result, the sleeve 30 and the elastic member 50 are installed in the housing 10 through the second opening 121.

[0102] The second wall 12 and the first wall 11 define the interior space of the housing 10, and the end of the second wall 12 away from the first wall 11 defines a second opening 121. This allows the sleeve 30 and the elastic member 50 to be placed inside the housing 10 through the second opening 121.

[0103] 6, a plurality of third teeth 42 are provided on the outer peripheral surface of the limit member 40 and distributed along the circumferential direction, and a plurality of fourth teeth (not shown) are provided on the inner peripheral surface of the second wall 12 and distributed along the circumferential direction. The third teeth 42 mesh with the fourth teeth, thereby locking the limit member 40 in the circumferential direction.

[0104] The outer peripheral surface of the limit member 40 refers to the surface for connecting to the second wall 12 of the limit member 40 .

[0105] The meshing of the third tooth 42 and the fourth tooth simplifies the structure, effectively restricts the rotation of the limit member 40 relative to the housing 10, and ensures a locking effect on the limit member 40 in the circumferential direction.

[0106] 1, 2, and 7, a stepped surface 122 is optionally formed on the inner surface of the second wall 12. The locking device 100 further includes a locking spring 60, and the side of the limit member 40 facing the first wall 11 abuts against the stepped surface 122, while the side of the limit member 40 facing away from the first wall 11 abuts against the locking spring 60, thereby locking the limit member 40 in the axial direction.

[0107] 7 , a first groove 123 is formed in a portion of the inner surface of the second wall 12, recessed in a direction away from the axis of the bolt 20. The groove wall of the first groove 123 forms a stepped surface 122, which is disposed parallel to the first wall 11. A portion of the limit member 40 is housed in the first groove 123, and the side of the limit member 40 facing the first wall 11 abuts against the stepped surface 122, which restricts the movement of the limit member 40 toward the first wall 11.

[0108] 7, a second groove 124 is formed on the inner surface of the second wall 12. The second groove 124 is located at the end of the first groove 123 that is away from the first wall 11 in the axial direction. The locking spring 60 is installed in the second groove 124, and the limit member 40 is installed between the locking spring 60 and the step surface 122.

[0109] The engagement between the stepped surface 122 and the locking spring 60 restricts the movement of the limit member 40 along the axial direction, and the locking spring 60 facilitates assembly and removal, ensuring the axial limit while improving assembly and maintenance efficiency.

[0110] 8 is a structural schematic diagram of a locking spring 60 according to some embodiments of the present application. In some embodiments, as shown in FIG. 8, the locking spring 60 includes a locking spring body 61 and locking spring lugs 62 located at both ends of the locking spring body 61. The locking spring body 61 has an arc-shaped structure, and the locking spring lugs 62 are provided with pliers holes for plier engagement with the locking spring. Optionally, the angle of the locking spring body 61 is greater than 180 degrees.

[0111] According to some embodiments of the present application, the elastic member 50 may be an elastic member such as a spring, rubber, etc. Optionally, as shown in FIG.

[0112] 9 is an exploded view of a connecting structure 1000 according to some embodiments of the present application, and FIG. 10 is a cross-sectional view of the connecting structure 1000 according to some embodiments of the present application. According to some embodiments of the present application, as shown in FIGS. 9 and 10, the present application further provides a connecting structure 1000, which includes a first base 700, a second base 800, a nut 900, and a locking device 100 according to any one of the above solutions. The nut 900 is fixed to the first base 700, and the locking device 100 is fixed to the second base 800. The bolt 20 of the locking device 100 is connected to the nut 900 to lock the second base 800 to the first base 700.

[0113] The first base body 700 and the second base body 800 are two components that need to be connected. As shown in Figure 10, a nut 900 is fixed to the first base body 700 by a screw fastener 910.

[0114] The second base 800 is locked to the first base 700 by the connection and engagement between the bolt 20 and the nut 900 of the locking device 100, which facilitates assembly and disassembly, and improves assembly and maintenance efficiency.

[0115] 11 is a structural schematic diagram of a second base 800 according to some embodiments of the present application. According to some embodiments of the present application, optionally, as shown in FIGS. 10 and 11 , a receiving cavity 810 is provided in the second base 800. The housing 10 of the locking device 100 is provided in the receiving cavity 810, and a through-hole 820 is provided in the inner wall of the receiving cavity 810. The housing 10 further includes a boss 13 (see FIGS. 1 and 9 ), which is formed on the outer surface of the first wall 11 and is provided around the first opening 111, and the boss 13 is inserted into the through-hole 820 and is interference-fitted with the through-hole 820.

[0116] The inner wall of the accommodating cavity 810 refers to the wall formed surrounding the accommodating cavity 810, and the through hole 820 communicates the inside and outside of the accommodating cavity 810. After the boss 13 is inserted into the through hole 820 on the inner wall of the accommodating cavity 810, the bolt 20 can extend from this through hole 820 to be connected to a nut 900 fixed to the first base 700.

[0117] The boss 13 is inserted into the through hole 820 on the inner wall of the accommodating cavity 810 and tightly fitted into this through hole 820, thereby increasing the connection area between the housing 10 and the second base 800 and ensuring the connection strength between the housing 10 and the second base 800.

[0118] According to some embodiments of the present application, optionally, a plurality of fifth teeth 131 are provided on the outer peripheral surface of the boss 13, as shown in FIG. 9, distributed along the circumferential direction.

[0119] When the housing 10 of the locking device 100 is engaged with the second base 800, the boss 13 is inserted into the through-hole 820 on the inner wall of the receiving cavity 810, and the plurality of fifth teeth 131 are tightly fitted into the through-hole 820. The arrangement of the plurality of fifth teeth 131 increases the contact area between the boss 13 and the hole wall of the through-hole 820, providing a better anti-rotation effect and further improving the connection strength between the housing 10 and the second base 800.

[0120] According to some embodiments of the present application, optionally, as shown in FIGS. 9 and 11, the housing 10 is a rectangular housing, and the shape of the receiving cavity 810 matches the shape of the housing 10.

[0121] The housing 10 is a rectangular housing, and the outer surface of the housing 10 is a quadrilateral cylindrical surface, that is, the housing 10 has four cylindrical surfaces connected in sequence along the circumferential direction, and the four cylindrical surfaces are installed two by two opposite each other.

[0122] The square housing form can prevent the housing 10 from rotating relative to the second base body 800, and has a better anti-rotation effect.

[0123] According to some embodiments of the present application, optionally, the nut 900 is a floating nut, which facilitates assembly of the bolt 20 and the nut 900 and ensures assembly accuracy.

[0124] According to some embodiments of the present application, the present application further provides a power consumption device, which includes a device body, a battery, and the connection structure 1000 described in any one of the above solutions. The first base 700 is fixed to the device body, and the second base 800 is fixed to the battery.

[0125] The power-consuming device may be a vehicle, such as a new energy vehicle, or other device that uses a battery as a power source. For example, according to some embodiments of the present application, as shown in Figures 1 and 2, the present application provides a locking device 100, which includes a housing 10, a bolt 20, a sleeve 30, a limit member 40, and an elastic member 50.

[0126] The housing 10 includes a first wall 11 and a second wall 12, and a first opening 111 is provided in the first wall 11. The second wall 12 is provided surrounding the first wall 11, and one end of the second wall 12 is connected to an edge of the first wall 11, and the other end of the second wall 12 defines a second opening 121 facing the first wall 11.

[0127] The bolt 20 is installed in the housing 10, and the bolt 20 extends through the first opening 111. The bolt 20 includes a threaded portion 21, a first transmission portion 22, and a locking portion 23, which are distributed in order along the axial direction, and the cross-sectional area of the first transmission portion 22 is larger than the cross-sectional area of the locking portion 23.

[0128] The sleeve 30 is installed in the housing 10 and fitted onto the bolt 20, and includes a sleeve body 31 and a first flange 32 extending radially from one end of the sleeve body 31. The sleeve body 31 is fitted onto the locking portion 23 and is circumferentially locked with the locking portion 23, and a second transmission portion 33 corresponding to the first transmission portion 22 is installed on the first flange 32. The second transmission portion 33 is engaged with the first transmission portion 22.

[0129] The limit member 40 is fixed to the housing 10 and is installed in the second opening 121. The limit member 40 has an annular structure, and the outer peripheral surface of the limit member 40 is circumferentially locked and engaged with the second wall 12 of the housing 10. When the limit member 40 is joined with the sleeve 30, the inner peripheral surface of the limit member 40 is circumferentially locked and engaged with the first flange 32.

[0130] The elastic member 50 is installed in the housing 10, and both ends of the elastic member 50 abut against the first wall 11 and the first flange 32 of the sleeve 30, respectively. The elastic member 50 is used to apply an elastic force along the axial direction to the sleeve 30 so that the sleeve 30 is joined with the limit member 40.

[0131] Since the elastic member 50 is installed between the first wall 11 and the sleeve 30, the axial space within the housing 10 can be utilized efficiently and the axial size of the bolt 20 can be reduced, so that the axial size of the locking device 100 can be designed to be relatively small, reducing the installation space it occupies and adapting to different installation environments.

[0132] Although the present application has been described in connection with preferred embodiments, various modifications may be made thereto and equivalent parts may be substituted without departing from the scope of the present application. In particular, the technical features mentioned in each embodiment may be combined in any form unless structural contradiction exists. The present application is not limited to the specific embodiments disclosed in this specification, but includes all technical solutions within the scope of the claims. [Explanation of symbols]

[0133] 100 - locking device; 10 - housing; 11 - first wall; 111 - first opening; 12 - second wall; 121 - second opening; 122 - stepped surface; 123 - first groove; 124 - second groove; 13 - boss; 131 - fifth tooth; 20 - bolt; 21 - threaded portion; 22 - first transmission portion; 23 - locking portion; 24 - second flange; 30 - sleeve; 31 - sleeve body; 3 2—first flange; 33—second transmission part; 34—first tooth; 40—limiting member; 41—second tooth; 42—third tooth; 50—elastic member; 60—locking spring; 61—locking spring body; 62—locking spring lug; 700—first base; 800—second base; 810—accommodating cavity; 820—through hole; 900—nut; 910—thread fastener; 1000—connecting structure

Claims

1. A locking device, a housing including a first wall in which the first opening is located; a bolt disposed within the housing and extending through the first opening; a sleeve that is installed in the housing and fitted onto the bolt, and that is locked with the bolt in a circumferential direction and is movable relative to the bolt in an axial direction; a limit member fixed to the housing for preventing the sleeve from being removed from the housing in a direction away from the first wall; an elastic member that is installed in the housing and is used to apply an elastic force along the axial direction to the sleeve so that the sleeve is joined with the limit member, and that is configured to lock the sleeve in a circumferential direction when joined with the sleeve; wherein both ends of the elastic member abut against the first wall and the sleeve, respectively; a locking device, wherein the bolt includes a threaded portion, a first transmission portion, and a locking portion, which are distributed in order along the axial direction, the first transmission portion and the sleeve are engaged in transmission engagement, and the locking portion and the sleeve are engaged in locking engagement in the circumferential direction, and the cross-sectional area of the first transmission portion is larger than the cross-sectional area of the locking portion.

2. 2. The locking device according to claim 1, wherein the sleeve includes a sleeve body and a first flange extending radially from one end of the sleeve body, the sleeve body is fitted into the locking portion and is circumferentially lockingly engaged with the locking portion, a second transmission portion corresponding to the first transmission portion is installed on the first flange, the second transmission portion is used for transmission engagement with the first transmission portion, and the elastic member abuts against the first flange.

3. 3. The locking device according to claim 2, wherein the bolt further includes a second flange, the second flange and the first flange are opposed to each other along the axial direction, the threaded portion and the locking portion are located on opposite sides of the second flange, and the first transmission portion is installed on the second flange.

4. 4. The locking device according to claim 3, wherein one of the first transmission part and the second transmission part has a protrusion shape, and the other has a recessed groove that matches the protrusion shape.

5. 5. The locking device according to claim 4, wherein the first transmission part and the second transmission part are splined together.

6. The locking device according to claim 2 , wherein the outer peripheral surface of the sleeve body is a polygonal cylindrical surface.

7. 7. The locking device according to claim 2, wherein the inner peripheral surface of the sleeve body and the outer peripheral surface of the locking portion are both polygonal cylindrical surfaces.

8. 8. The locking device according to claim 1, wherein a plurality of first teeth are provided on the sleeve and distributed along a circumferential direction, and a plurality of second teeth are provided on the limit member and distributed along a circumferential direction, and the plurality of second teeth are used to mesh with the plurality of first teeth to lock the sleeve in the circumferential direction.

9. 9. The locking device according to claim 1, wherein the housing further includes a second wall, the second wall being disposed to surround the first wall, one end of the second wall being connected to an edge of the first wall, and the other end of the second wall defining a second opening facing the first wall, and the limit member being disposed in the second opening.

10. 10. The locking device according to claim 9, wherein a plurality of third teeth are provided on an outer peripheral surface of the limit member and distributed along a circumferential direction, and a plurality of fourth teeth are provided on an inner surface of the second wall and distributed along a circumferential direction, the plurality of third teeth meshing with the plurality of fourth teeth, thereby locking the limit member in the circumferential direction.

11. 10. The locking device according to claim 9, wherein a stepped surface is formed on an inner surface of the second wall, the locking device further includes a locking spring, wherein a side of the limit member facing the first wall abuts against the stepped surface and a side of the limit member away from the first wall abuts against the locking spring, thereby locking the limit member in the axial direction.

12. A connection structure, a first substrate; a second substrate; and a nut fixed to the first base; and a locking device according to any one of claims 1 to 11, The locking device is fixed to the second base, and the bolt of the locking device is connected to the nut to lock the second base to the first base.

13. 13. The connection structure according to claim 12, wherein an accommodating cavity is provided in the second base, the housing of the locking device is provided in the accommodating cavity, a through hole is provided in an inner wall of the accommodating cavity, the housing further includes a boss, the boss is formed on an outer surface of the first wall and is provided surrounding the first opening, the boss is inserted into the through hole and is interference-fitted into the through hole.

14. The connection structure according to claim 13 , wherein a plurality of fifth teeth are provided on the outer peripheral surface of the boss and distributed along the circumferential direction.

15. The connection structure according to claim 13 , wherein the housing is a rectangular housing, and the shape of the receiving cavity matches the shape of the housing.

16. A power consuming device, The device body, Batteries and The connection structure according to any one of claims 12 to 15, The power consuming device, wherein the first base is fixed to the device body, and the second base is fixed to the battery.

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