Locking assembly, battery box system and vehicle

Abstract

The present invention relates to the field of vehicle battery replacement technology, and in particular, to a locking assembly, a battery box system and a vehicle. The locking assembly includes a mounting seat, a rotating unit and a driving unit. The first rotating part on the rotating unit is rotatably connected to the mounting seat via a first rotating shaft, and the second rotating shaft and the third rotating shaft are rotatably connected between the first rotating part and the second rotating part. The first guide part is arranged on the mounting seat and slidably cooperates with the second rotating shaft. The second guide part is arranged on the first rotating part and slidably cooperates with the second rotating shaft. The first motion state of the locking assembly includes: the driving unit drives the first rotating part and the second rotating part to rotate around the first rotating shaft at the same time. The second motion state of the locking assembly includes: the driving unit drives the second rotating shaft to move along the first guide part and the second guide part. This solves the problems of conventional battery box locking devices having no pre-tightening force, no mechanical self-locking and small mechanical tolerance.

Description

Technical Field

[0001] The present invention relates to the field of vehicle battery replacement technology, and in particular to a locking assembly, a battery box system and a vehicle. Background Art

[0002] The locking device is a mechanism used to fix the battery box on electric vehicles. It can usually lock the base of the battery box to the bottom bracket structure on the car, so that the battery box can be stably installed on the car. Currently, common locking devices often use a cylinder to push the lock tongue to the top of the battery box base, which can prevent the battery box from detaching from the bottom bracket. Considering the unlocking problem during maintenance or battery replacement, the greater the pressure of the lock tongue on the battery box base, the greater the friction resistance when the cylinder drives the lock tongue back. The rebound force of the cylinder is small, and it is easy to be damaged during the unlocking process. Therefore, there is usually a gap between the lock tongue and the battery box base, and the lock tongue is only used to limit the top of the battery box base without generating pre-tightening force.

[0003] However, when the car is driving, if it encounters bumps or emergency braking, the battery box base will frequently collide with the lock tongue because the lock tongue has no pre-tightening force on the battery box. The lock tongue may become loose or broken, causing safety hazards while the car is driving. Summary of the Invention

[0004] In order to solve the problem of a battery box having no pre-tightening force when locked on a vehicle, the present invention provides a locking assembly, a battery box system and a vehicle.

[0005] In a first aspect, the present invention provides a locking assembly, comprising:

[0006] Mounting seat;

[0007] The rotating unit comprises a first rotating part, a second rotating part, a first rotating shaft, a second rotating shaft, a third rotating shaft, a first guide part and a second guide part; the first rotating part is rotatably connected to the mounting seat through the first rotating shaft; the second rotating shaft and the third rotating shaft are rotatably connected between the first rotating part and the second rotating part; the first rotating shaft, the second rotating shaft and the third rotating shaft are parallel to the third rotating shaft; the distance between the second rotating shaft and the third rotating shaft is adjustable; the first guide part is provided on the mounting seat; the second rotating shaft is slidably engaged with the first guide part; one end of the first guide part is close to the first rotating shaft, and the other end is away from the first rotating shaft; the second guide part is provided on the first rotating part; the second rotating shaft is slidably engaged with the second guide part; one end of the second guide part is close to the first rotating shaft, and the other end is away from the first rotating shaft;

[0008] a driving unit, wherein the driving unit drives the first rotating part and the second rotating part to rotate;

[0009] Wherein, the locking assembly includes a first motion state and a second motion state;

[0010] The first motion state includes: the driving unit drives the first rotating part and the second rotating part to rotate around the first rotating axis simultaneously;

[0011] The second motion state includes: the driving unit drives the second rotating shaft to move along the first guide part and the second guide part; in the projection of the locking assembly along the direction parallel to the first rotating shaft, there is an intersection between the first guide part and the second guide part; the position of the second rotating shaft coincides with the position of the intersection; the extension direction of the end of the second guide part away from the first rotating shaft is the direction in which the first guide part is away from the third rotating shaft.

[0012] In some embodiments, the first guide portion is linear; the projection of the first rotating shaft along its own axis coincides with one end of the first guide portion; the second guide portion is arc-shaped; the projection of the first rotating shaft along its own axis coincides with one end of the second guide portion;

[0013] The first motion state includes: the first rotating shaft and the second rotating shaft are coaxial;

[0014] The second motion state includes: the first rotating shaft and the second rotating shaft are misaligned.

[0015] In some embodiments, the first guide portion is straight-line; the second guide portion is arc-shaped;

[0016] The rotating unit further includes a third guide portion; the third guide portion is disposed on the mounting seat; the third guide portion is in an arc shape with the first rotating shaft as the center; the end of the first guide portion close to the first rotating shaft is connected to one end of the third guide portion;

[0017] The first motion state includes: the first rotating shaft and the second rotating shaft are misaligned; and the second rotating shaft slides along the third guide portion.

[0018] In some embodiments, the first guide portion is in a straight line shape; the second guide portion is in a straight line shape;

[0019] The rotating unit further includes a third guide portion; the third guide portion is disposed on the mounting seat; the third guide portion is in an arc shape with the first rotating shaft as the center; the end of the first guide portion close to the first rotating shaft is connected to one end of the third guide portion;

[0020] The first motion state includes: the first rotating shaft and the second rotating shaft are misaligned; and the second rotating shaft slides along the third guide portion.

[0021] In some embodiments, the static friction coefficient of the contact surface between the first guide portion and the second rotating shaft is 0.1-0.12; and the angle between the tangent of the end of the second guide portion away from the first rotating shaft and the first guide portion is less than or equal to 5°.

[0022] In some embodiments, the driving unit includes a driving part and a connecting seat; one end of the driving part is a fixed end, and the other end is a movable end; the fixed end of the driving part is rotatably connected to the connecting seat; the movable end of the driving part is rotatably connected to the second rotating part.

[0023] In some embodiments, the second rotating part includes two oppositely arranged rotating plates and a connecting block; the connecting block is detachably connected between the two rotating plates; the movable end of the driving part is rotatably connected to the connecting block; and the first rotating part is located between the two rotating plates.

[0024] In some embodiments, the rotating unit further includes a fourth guide portion, which is disposed on the second rotating portion; the second rotating shaft is slidably engaged with the fourth guide portion; and the third rotating shaft is located on an extension line of the fourth guide portion in the longitudinal direction.

[0025] In a second aspect, the present invention provides a battery box system, the battery box system comprising any one of the locking assemblies described in the first aspect, the battery box system further comprising:

[0026] bottom bracket; the mounting seat is detachably connected to the bottom bracket; the driving unit is detachably connected to the bottom bracket;

[0027] battery box frame; when the battery box frame is locked on the bottom bracket, the bottom portion of the battery box frame is pressed between the rotating unit and the bottom bracket;

[0028] When the driving unit drives the first rotating part and the second rotating part to rotate, the third rotating shaft rotates toward or away from the battery box frame.

[0029] In a third aspect, the present invention provides a vehicle, comprising the battery box system of the second aspect, and further comprising:

[0030] a vehicle frame, wherein the bottom bracket of the battery box system is detachably connected to the vehicle frame;

[0031] A wheel is rotatably connected to the vehicle frame.

[0032] To solve the problem of low reliability of the locking assembly, the present invention has the following advantages:

[0033] The first and second rotating parts are connected by a first rotating shaft and a second rotating shaft. The second rotating shaft slides within the first and second guides to enable relative rotation of the first and second rotating parts, achieving a staged clamping effect. During the rapid swinging phase of the first motion state, the first rotating part can rotate close to the battery compartment frame. This allows the second rotating shaft to move much farther during the second stage of clamping than the third rotating shaft's downward rotation. This, according to the law of conservation of energy, amplifies the clamping force and ensures a stable clamping effect. Furthermore, by controlling the angle between the tangent of the second guide, which passes through the locked position, and the first guide, the angle between the tangent of the second guide, which passes through the locked position, and the first guide can be controlled when the second rotating part moves to the locked position. This angle is smaller than the self-locking angle, so that the friction force of the self-locking force hinders the movement of the second rotating part toward the first rotating part. This self-locking force prevents the first rotating part from unlocking under vibrating conditions, reducing the performance requirements of the drive unit, improving locking stability, and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram showing a locking assembly in an unlocked state according to an embodiment is shown;

[0035] Figure 2 A schematic diagram showing a state in which a locking assembly according to an embodiment is quickly swung into position is shown;

[0036] Figure 3 A schematic diagram showing a first rotating portion and a second rotating portion according to an embodiment is shown;

[0037] Figure 4 A schematic diagram of a first rotating portion according to an embodiment is shown;

[0038] Figure 5 A schematic diagram showing the positional relationship between the first rotating shaft and the second rotating shaft in a rapid swinging stage according to an embodiment;

[0039] Figure 6 A front view of a first rotating portion of an embodiment is shown;

[0040] Figure 7 shows a front view of a mount according to one embodiment;

[0041] Figure 8 A simplified schematic diagram showing another embodiment of the first rotating shaft, the second rotating shaft, the first guide portion, and the second guide portion in a compressed state;

[0042] Figure 9 A simplified schematic diagram showing a first rotating shaft, a second rotating shaft, a first guide portion, and a second guide portion in a compressed state according to another embodiment is shown;

[0043] Figure 10 A schematic diagram of a battery box system according to an embodiment is shown;

[0044] Figure 11 A schematic diagram of a vehicle is shown according to an embodiment.

[0045] Figure numerals: 10 mounting seat; 20 rotating unit; 21 first rotating part; 211 rotating block; 212 pressing block; 22 second rotating part; 221 rotating plate; 222 connecting block; 23 first rotating shaft; 24 second rotating shaft; 25 third rotating shaft; 26 first guide part; 27 second guide part; 28 third guide part; 29 fourth guide part; 30 driving unit; 31 driving part; 32 connecting seat; 40 bottom bracket; 50 battery box frame; 60 frame; 70 wheel. DETAILED DESCRIPTION

[0046] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the present disclosure, rather than to imply any limitation on the scope of the present disclosure.

[0047] As used herein, the term "including" and its variations are to be interpreted as open-ended terms meaning "including, but not limited to." The term "based on" is to be interpreted as "based, at least in part, on." The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment." The term "another embodiment" is to be interpreted as "at least one other embodiment." Terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily intended to better describe the present application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationships. For example, the term "on" may, in certain circumstances, be used to indicate a dependency or connection relationship. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" are to be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise specified, "plurality" means two or more.

[0048] The locking device is a mechanism used to fix the battery box on electric vehicles. It can usually lock the base of the battery box to the bottom bracket structure on the car, so that the battery box can be stably installed on the car. Currently, common locking devices often use a cylinder to push the lock tongue to the top of the battery box base, which can prevent the battery box from detaching from the bottom bracket. Considering the unlocking problem during maintenance or battery replacement, the greater the pressure of the lock tongue on the battery box base, the greater the friction resistance when the cylinder drives the lock tongue back. The rebound force of the cylinder is small, and it is easy to be damaged during the unlocking process. Therefore, there is usually a gap between the lock tongue and the battery box base. The lock tongue is only used to limit the top of the battery box base without generating pre-tightening force, and there is no self-locking effect.

[0049] However, during driving, the battery box base and the lock tongue frequently collide with each other due to the lack of pre-tightening force applied by the lock tongue during bumps or sudden braking. This can cause the lock tongue to loosen or break, posing a safety hazard. Furthermore, mechanical design errors exist between the lock tongue's travel, the battery box base, and the vehicle's support structure, creating a difficult mechanical design challenge that requires consideration.

[0050] Therefore, conventional battery box locking devices have technical difficulties such as no pre-tightening force, no self-locking effect, and small mechanical tolerance.

[0051] This embodiment discloses a locking assembly, such as Figure 1 、 Figure 4 and Figure 6 As shown, it may include a mounting base 10 , a rotating unit 20 and a driving unit 30 .

[0052] The rotating unit 20 may include a first rotating portion 21, a second rotating portion 22, a first rotating shaft 23, a second rotating shaft 24, a third rotating shaft 25, a first guide portion 26, and a second guide portion 27. The mounting base 10 is stationary. The first rotating portion 21 is rotatably connected to the mounting base 10 via the first rotating shaft 23, allowing the first rotating portion 21 to rotate about the fixed first rotating shaft 23. The second rotating shaft 24 and the third rotating shaft 25 are rotatably connected between the first rotating portion 21 and the second rotating portion 22. The first rotating shaft, the second rotating shaft 24, and the third rotating shaft 25 are parallel to each other, and the distance between the second rotating shaft 24 and the third rotating shaft 25 can be adjusted within a set range. The first guide portion 26 may be a guide groove provided on the mounting base 10 or a track detachably connected to the mounting base 10. The second rotating shaft 24 may slidably engage with the first guide portion 26. One end of the first guide portion 26 is adjacent to the first rotating shaft 23, while the other end is spaced away from the first rotating shaft 23. The second guide portion 27 is disposed on the first rotating portion 21, and the second rotating shaft 24 can slideably engage with the second guide portion 27. One end of the second guide portion 27 is close to the first rotating shaft 23, and the other end is away from the first rotating shaft 23. The second rotating shaft 24 can slideably engage with both the first guide portion 26 and the second guide portion 27, thereby driving the first rotating portion 21 to rotate relative to the mounting base 10.

[0053] The driving unit 30 may provide a driving force to rotate the first rotating portion 21 and the second rotating portion 22 .

[0054] The locking assembly may include a first motion state and a second motion state.

[0055] The first motion state may include: the driving unit 30 drives the first rotating part 21 and the second rotating part 22 to rotate simultaneously around the first rotation axis 23. In the first motion state, the first rotating part 21 and the second rotating part 22 can achieve rapid swinging.

[0056] The second motion state involves the drive unit 30 driving the second rotating shaft 24 to move along the first guide portion 26 and the second guide portion 27, resulting in relative motion between the first guide portion 26 and the second guide portion 27. In a projection of the locking assembly parallel to the first rotating shaft 23, the first guide portion 26 and the second guide portion 27 intersect at a point, with the second rotating shaft 24 coinciding with the intersection. The end of the second guide portion 27 distal from the first rotating shaft 23 extends in a direction that is away from the third rotating shaft 25. Therefore, in the second motion state, as the second rotating shaft 24 moves away from the first rotating shaft 23, the second rotating shaft 24 exerts a pressing force against the second guide portion 27, driving the first rotating portion 21 to continue rotating about the first rotating shaft 23, achieving further compression. According to the law of conservation of energy, the work done by the drive unit 30 on the second rotating shaft 24 is equal to the work done by the third rotating shaft 25 when it swings downward. Since the moving path of the second rotating shaft 24 is much larger than the swinging path of the third rotating shaft 25, the clamping force of the first rotating part 21 close to the third rotating shaft 25 is much larger than the driving force of the drive unit 30 on the second rotating shaft 24, thereby amplifying the clamping force and ensuring a relatively stable clamping effect.

[0057] Furthermore, by controlling the angle between the tangent of the second guide portion 27, which is away from the end of the first rotating shaft 23, and the first guide portion 26, the angle between the tangent of the second guide portion 27, which passes through the locked position, and the first guide portion 26 can be controlled when the second rotating shaft 24 moves to the locked position. This angle is smaller than the self-locking angle, and the self-locking friction force hinders the movement of the second rotating shaft 24 toward the first rotating shaft 23. Under vibrating conditions, the first rotating portion 21 can rely on the self-locking force, making it difficult to unlock. This reduces the performance requirements of the drive unit 30, improves locking stability, and reduces costs. Furthermore, when the second rotating shaft 24 passes the locked position in the second motion state, it can continue to slowly tighten, and remains in a self-locking state during this slow tightening process.

[0058] Therefore, this embodiment solves the technical problems of the conventional battery box locking device having no pre-tightening force, no self-locking effect and small mechanical tolerance.

[0059] In this embodiment, if Figure 2 and Figure 4 As shown, the first guide portion 26 is linear, and the projection of the first rotating shaft 23 along its own axis coincides with one end of the first guide portion 26. The second guide portion 27 can be arc-shaped, and the projection of the first rotating shaft 23 along its own axis coincides with one end of the second guide portion 27.

[0060] At this time, the first motion state may include: the first rotation axis 23 and the second rotation axis 24 are coaxial, and the first rotating part 21 and the second rotating part 22 both swing rapidly around the first rotation axis 23. At this time, the first guide part 26 and the second guide part 27 have only one intersection point. Figure 5It shows that the first rotating shaft 23 and the second rotating shaft 24 are in a coaxial state during the rapid swinging stage.

[0061] The second motion state can include: the first rotating shaft 23 and the second rotating shaft 24 are misaligned, and the second rotating shaft 24 slides along the first guide portion 26 and the second guide portion 27. The second guide portion 27 and the first guide portion 26 have two intersection points, one corresponding to the first rotating shaft 23 and the other corresponding to the second rotating shaft 24. The end of the second guide portion 27 away from the first rotating shaft 23 extends in the direction in which the first guide portion 26 is away from the third rotating shaft 25. Therefore, in the second motion state, as the second rotating shaft 24 moves away from the first rotating shaft 23, the second rotating shaft 24 can drive the first rotating portion 21 to continue rotating about the first rotating shaft 23 through the pressing force against the second guide portion 27, thereby achieving further compression.

[0062] In another embodiment, Figure 8 As shown, the first guide portion 26 is linear and the second guide portion 27 is arc-shaped. Preferably, the first rotation axis 23 can be located on the extension line of the first guide portion 26. The first guide portion 26 and the second guide portion 27 always have only one intersection point, which is the position of the second rotation axis 24.

[0063] The rotating unit 20 may further include a third guide portion 28, which is disposed on the mounting base 10. The third guide portion 28 is arc-shaped with the first rotating shaft 23 as its center. The end of the first guide portion 26 near the first rotating shaft 23 is connected to one end of the third guide portion 28. Therefore, when the second rotating shaft 24 rapidly swings around the first rotating shaft 23 in the first motion state, the second rotating shaft 24 slides along the third guide portion 28.

[0064] At this time, the first motion state may include: the first rotating shaft 23 and the second rotating shaft 24 are misaligned, the second rotating shaft 24 swings rapidly along the third guide portion 28 to the intersection of the third guide portion 28 and the first guide portion 26, and the first rotating portion 21 and the second rotating portion 22 swing rapidly with the first rotating shaft 23.

[0065] The second motion state may include: the first rotation shaft 23 and the second rotation shaft 24 are misaligned, and the direction of extension of the end of the second guide portion 27 away from the first rotation shaft 23 is the direction in which the first guide portion 26 is away from the third rotation shaft 25. Therefore, in the second motion state, as the second rotation shaft 24 slides upward along the first guide portion 26, the second rotation shaft 24 can drive the first rotating portion 21 to continue rotating around the first rotation shaft 23 due to the pressing force on the second guide portion 27, thereby achieving further compression.

[0066] Preferably, the first rotating shaft 23 may be located on the extension line of the first guide portion 26 , so that the second rotating shaft 24 slides along the first guide portion 26 at a faster speed in the second motion state.

[0067] In yet another embodiment, Figure 9 As shown, the first guide portion 26 is linear, and the second guide portion 27 may also be linear. The first rotation axis 23 and the second rotation axis 24 are offset in both the first and second motion states, meaning that the first rotation axis 23 and the second rotation axis 24 are not coaxial. The first rotation axis 23 is offset from the second guide portion 27. The first guide portion 26 and the second guide portion 27 always have only one intersection, which is the location of the second rotation axis 24.

[0068] The rotation unit 20 may further include a third guide portion 28 disposed on the mounting base 10. The third guide portion 28 is arc-shaped with the first rotation axis 23 as its center. The end of the first guide portion 26 near the first rotation axis 23 engages with one end of the third guide portion 28, thereby enabling rapid swinging of the second rotation axis 24 about the first rotation axis 23 in the first motion state. The third guide portion 28 may be a guide slot defined in the mounting base 10 or a track removably connected to the mounting base 10.

[0069] At this time, the first motion state may include: the first rotating shaft 23 and the second rotating shaft 24 are misaligned, the second rotating shaft 24 swings rapidly along the third guide portion 28 to the intersection of the third guide portion 28 and the first guide portion 26, and the first rotating portion 21 and the second rotating portion 22 swing rapidly with the first rotating shaft 23.

[0070] The second motion state can include: the first rotating shaft 23 and the second rotating shaft 24 are misaligned, and the end of the second guide portion 27 away from the first rotating shaft 23 extends in the direction in which the first guide portion 26 is away from the third rotating shaft 25. Therefore, in the second motion state, as the second rotating shaft 24 slides upward along the first guide portion 26, the second rotating shaft 24, through the pressing force on the second guide portion 27, can drive the first rotating portion 21 to continue rotating about the first rotating shaft 23, achieving further slow compression. Furthermore, during this slow compression process, the locking assembly remains in a self-locking state.

[0071] Preferably, the first rotating shaft 23 may be located on the extension line of the first guide portion 26 , so that the second rotating shaft 24 slides along the first guide portion 26 at a faster speed in the second motion state.

[0072] In this embodiment, the static friction coefficient of the contact surface between the first guide portion 26 and the second rotating shaft 24 can be 0.1~0.12, and the angle between the tangent of the end of the second guide portion 27 away from the first rotating shaft 23 and the first guide portion 26 is less than or equal to 5°, so that the friction between the second rotating shaft 24 and the first guide portion 26 and the resistance of the second guide portion 27 can hinder the second rotating shaft 24 from moving toward the first rotating shaft 23, thereby forming self-locking, making the locking assembly more stable for locking the battery box.

[0073] In this embodiment, if Figure 2As shown, the driving unit 30 may include a driving part 31 and a connecting seat 32. The driving part 31 may be a cylinder, one end of which is a fixed end and the other end is a movable end. The connecting seat 32 is fixed on the base. The fixed end of the driving part 31 is rotatably connected to the connecting seat 32, and the movable end of the driving part 31 is rotatably connected to the second rotating part 22. The movable end of the driving part 31 can be telescopic to drive the second rotating part 22 to rotate around the first rotating shaft 23. In some embodiments, two driving parts 31 may be used, one driving the first rotating part 21 to swing rapidly and driving the second rotating part 22 to swing rapidly. The other driving part 31 drives the second rotating part 22 to rotate relative to the first rotating part 21, thereby achieving further compression of the first rotating part 21 and self-locking of the rotating unit 20.

[0074] In this embodiment, if Figure 3 and Figure 6 As shown, the second rotating portion 22 may include two opposing rotating plates 221 and a connecting block 222. The connecting block 222 is detachably connected between the two rotating plates 221. The movable end of the driving portion 31 is rotatably connected to the connecting block 222. The first rotating portion 21 is located between the two rotating plates 221. Using two identical rotating plates 221 allows for symmetrical arrangement of two sets of first rotating shafts 23, improving the overall symmetry of the rotating unit 20 and enhancing operational stability.

[0075] In this embodiment, if Figure 3 and Figure 7 As shown, the rotating unit 20 further includes a fourth guide portion 29, which is disposed on the second rotating portion 22. The second rotating shaft 24 can slideably engage with the fourth guide portion 29, and the third rotating shaft 25 is located on an extension of the length of the fourth guide portion 29. Thus, the second rotating shaft 24 can move within the fourth guide portion 29, and the distance between the second rotating shaft 24 and the third rotating shaft 25 can be adjusted accordingly, thereby simplifying the design of the third rotating shaft 25.

[0076] The first rotating part 21 may include a clamping block 212 and a rotating block 211. The rotating block 211 may be rotatably connected to the second rotating part 22 via the first rotating shaft 23. The clamping block 212 may be rotatably connected to the third rotating shaft 25. Thus, the clamping block 212 may rotate around the third rotating shaft 25 after contacting the battery box frame 50 until it fits tightly with the battery box frame 50, thereby optimizing the clamping effect of the first rotating part 21 on the battery box frame 50.

[0077] In this embodiment, a battery box system is provided. The battery box system includes any locking assembly of the above embodiments, such as Figure 10 As shown, the battery box system may further include a bottom bracket 40 and a battery box frame 50 .

[0078] The bottom bracket 40 can be fixed on the vehicle, and the mounting seat 10 can be detachably connected to the bottom bracket 40 .

[0079] When the battery box frame 50 is locked on the bottom bracket 40 , the bottom portion of the battery box frame 50 is compressed between the first rotating portion 21 and the bottom bracket 40 , thereby fixing the battery box to the vehicle.

[0080] When the driving unit 30 drives the first rotating portion 21 and the second rotating portion 22 to rotate, the third rotating shaft 25 rotates toward or away from the battery box frame 50 .

[0081] In this embodiment, a vehicle is provided, which includes the battery box system in the above embodiment, such as Figure 11 As shown, the vehicle may further include a frame 60 and wheels 70 .

[0082] The bottom bracket 40 in the battery box system can be detachably connected to the frame 60, so that the battery box locked on the bottom bracket 40 is also locked on the frame 60. The wheels 70 are rotatably connected to the frame 60 and can drive the frame 60 to move.

[0083] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and that in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A locking assembly, characterized in that: The locking assembly comprises: Mounting seat; The rotating unit comprises a first rotating part, a second rotating part, a first rotating shaft, a second rotating shaft, a third rotating shaft, a first guiding part and a second guiding part; the first rotating part is rotatably connected to the mounting seat through the first rotating shaft; the second rotating shaft and the third rotating shaft are rotatably connected between the first rotating part and the second rotating part; the first rotating shaft, the second rotating shaft and the third rotating shaft are parallel; the distance between the second rotating shaft and the third rotating shaft is adjustable; the first guiding part is arranged on the mounting seat; the second rotating shaft is slidably matched with the first guiding part; one end of the first guiding part is close to the first rotating shaft, and the other end is far away from the first rotating shaft; the second guiding part is arranged on the first rotating part; the second rotating shaft is slidably matched with the second guiding part; one end of the second guiding part is close to the first rotating shaft, and the other end is far away from the first rotating shaft; a driving unit, wherein the driving unit drives the first rotating part and the second rotating part to rotate; Wherein, the locking assembly includes a first motion state and a second motion state; The first motion state includes: the driving unit drives the first rotating part and the second rotating part to rotate around the first rotating axis at the same time; The second motion state includes: the driving unit drives the second rotating shaft to move along the first guide portion and the second guide portion; in the projection of the locking assembly along the direction parallel to the first rotating shaft, there is an intersection between the first guide portion and the second guide portion; the second rotating shaft coincides with the position of the intersection; the extension direction of the end of the second guide portion away from the first rotating shaft is the direction in which the first guide portion is away from the third rotating shaft; An included angle between a tangent line of the second guide portion away from the end of the first rotating shaft and the first guide portion is smaller than a self-locking angle.

2. A locking assembly according to claim 1, characterized in that: The first guide portion is in a straight line shape; the projection of the first rotating shaft along its own axis coincides with one end of the first guide portion; the second guide portion is in an arc shape; the projection of the first rotating shaft along its own axis coincides with one end of the second guide portion; The first motion state includes: the first rotating shaft is coaxial with the second rotating shaft; The second motion state includes: the first rotating shaft and the second rotating shaft are misaligned.

3. A locking assembly according to claim 1, characterized in that: The first guide portion is in a straight line shape; the second guide portion is in an arc shape; The rotating unit further includes a third guide portion; the third guide portion is disposed on the mounting seat; the third guide portion is in an arc shape with the first rotating shaft as the center; The end of the first guide portion close to the first rotating shaft is connected to one end of the third guide portion; The first motion state includes: the first rotating shaft is misaligned with the second rotating shaft; The second rotating shaft slides along the third guide portion.

4. A locking assembly according to claim 1, characterized in that: The first guide portion is in a straight line shape; the second guide portion is in a straight line shape; The rotating unit further includes a third guide portion; the third guide portion is disposed on the mounting seat; the third guide portion is in an arc shape with the first rotating shaft as the center; the end of the first guide portion close to the first rotating shaft is connected to one end of the third guide portion; The first motion state includes: the first rotating shaft and the second rotating shaft are misaligned; and the second rotating shaft slides along the third guide portion.

5. A locking assembly according to claim 1, characterized in that: The static friction coefficient of the contact surface between the first guide portion and the second rotating shaft is 0.1-0.12; the angle between the tangent of the end of the second guide portion away from the first rotating shaft and the first guide portion is less than or equal to 5°.

6. A locking assembly according to claim 1, characterized in that: The driving unit includes a driving part and a connecting seat; one end of the driving part is a fixed end, and the other end is a movable end; the fixed end of the driving part is rotatably connected to the connecting seat; and the movable end of the driving part is rotatably connected to the second rotating part.

7. A locking assembly according to claim 6, characterized in that: The second rotating part includes two rotating plates and a connecting block which are arranged opposite to each other; the connecting block is detachably connected between the two rotating plates; the moving end of the driving part is rotatably connected to the connecting block; and the first rotating part is located between the two rotating plates.

8. The locking assembly according to claim 1, characterized in that: The rotating unit further includes a fourth guide portion, which is disposed on the second rotating portion; the second rotating shaft is slidably matched with the fourth guide portion; and the third rotating shaft is located on an extension line of the fourth guide portion in a length direction.

9. A battery box system, characterized in that: The battery box system comprises: A locking assembly as claimed in any one of claims 1 to 8; The mounting seat is detachably connected to the bottom bracket; the driving unit is detachably connected to the bottom bracket; A battery box frame; when the battery box frame is locked on the bottom bracket, the bottom portion of the battery box frame is pressed between the rotating unit and the bottom bracket; When the driving unit drives the first rotating part and the second rotating part to rotate, the third rotating shaft rotates toward or away from the battery box frame.

10. A vehicle, characterized in that: The vehicle comprises: The battery box system as claimed in claim 9; A vehicle frame, wherein the bottom bracket in the battery box system is detachably connected to the vehicle frame; A wheel is rotatably connected to the frame.

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