Locking assembly, battery box system and vehicle

Abstract

The invention relates to the technical field of vehicle battery replacement, in particular to a locking assembly, a battery box system and a vehicle. The locking assembly comprises a mounting base, a rotating unit and a driving unit. A first rotating part on the rotating unit is rotationally connected with the mounting seat through a first rotating shaft, and a second rotating shaft and a third rotating shaft are rotationally connected between the first rotating part and the second rotating part. The first guide part is arranged on the mounting seat and is in sliding fit with the second rotating shaft. And the second guide part is arranged on the first rotating part and is in sliding fit with the second rotating shaft. The first motion state of the locking assembly comprises that the driving unit drives the first rotating part and the second rotating part to rotate around the first rotating shaft at the same time. And the second motion state of the locking assembly comprises that the driving unit drives the second rotating shaft to move along the first guide part and the second guide part. Therefore, the problems that a conventional battery box locking device is free of pretightening force and mechanical self-locking and small in mechanical tolerance are solved.

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 an electric vehicle. It can usually lock the base of the battery box with 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, and the rebound force of the cylinder is small, which 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 and 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 break, causing safety hazards during driving. Summary of the invention

[0004] In order to solve the problem that a battery box has 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, the locking assembly comprising: 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 position of 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.

[0006] In some embodiments, 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.

[0007] In some embodiments, 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 and the second rotating shaft are misaligned; and the second rotating shaft slides along the third guide portion.

[0008] In some embodiments, 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.

[0009] 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°.

[0010] 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.

[0011] 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 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.

[0012] 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 length direction of the fourth guide portion.

[0013] In a second aspect, the present invention provides a battery box system, the battery box system comprising a locking assembly as described in any one of the first aspects, and the battery box system further comprising: 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.

[0014] In a third aspect, the present invention provides a vehicle, the vehicle comprising the battery box system in the second aspect, and the vehicle further comprising: 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.

[0015] In order to solve the problem of low reliability of the locking assembly, the present invention has the following advantages: The first rotating part and the second rotating part are connected by the first rotating shaft and the second rotating shaft, and the relative rotation of the first rotating part and the second rotating part is realized by sliding the second rotating shaft in the first guide part and the second guide part, so that the graded pressing can be realized. In the fast swinging stage of the first motion state, the first rotating part can be rotated to a position close to the battery box frame, so that the moving stroke of the second rotating shaft during the second stage pressing is much greater than the stroke of the third rotating shaft rotating downward. According to the law of conservation of energy, the pressing force can be amplified to ensure a stable pressing effect. In addition, by controlling the angle between the tangent of the second guide part away from the end of the first rotating shaft and the first guiding part, the angle between the tangent of the second guiding part passing through the locking position and the first guiding part can be controlled when the second rotating shaft moves to the locking position. This angle is smaller than the self-locking angle, and the friction force of the self-locking can hinder the second rotating shaft from moving toward the first rotating shaft. The first rotating part can rely on the self-locking force under the vibration condition so that it is not easy to unlock, which reduces the performance requirements for the drive unit, improves the stability of the locking and reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram showing a locking assembly in an unlocked state according to an embodiment; Figure 2 A schematic diagram showing a state in which a locking assembly according to an embodiment is quickly swung into position; Figure 3 A schematic diagram showing a first rotating part and a second rotating part of an embodiment is shown; Figure 4 A schematic diagram of a first rotating part of an embodiment is shown; Figure 5 A schematic diagram showing the positional relationship between the first rotating shaft and the second rotating shaft in a fast swinging stage according to an embodiment; Figure 6 A front view of a first rotating portion of an embodiment is shown; Figure 7 A front view of a mounting base of one embodiment is shown; 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; Fig. 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; Fig.10 A schematic diagram of a battery box system according to an embodiment is shown; Fig.11 A schematic diagram of a vehicle is shown according to an embodiment.

[0017] 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

[0018] 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 thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0019] As used herein, the term "including" and its variants 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". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. 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 directly connected, or indirectly connected through an intermediate medium, or it can be 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 and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0020] The locking device is a mechanism used to fix the battery box on an electric vehicle. It can usually lock the base of the battery box with 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, and the rebound force of the cylinder is small, which 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, and there is no self-locking effect.

[0021] However, when the car is in motion and 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, and the lock tongue may become loose or broken, thus causing safety hazards during driving. In addition, there are mechanical design errors between the travel of the lock tongue and the battery box base and the bottom bracket structure on the vehicle, which is a difficult problem that needs to be considered in mechanical structure design.

[0022] Therefore, conventional battery box locking devices have technical difficulties such as no pre-tightening force, no self-locking effect, and small mechanical tolerance.

[0023] 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 .

[0024] The rotating unit 20 may include a first rotating part 21, a second rotating part 22, a first rotating shaft 23, a second rotating shaft 24, a third rotating shaft 25, a first guide part 26 and a second guide part 27. The mounting seat 10 is fixed, and the first rotating part 21 can be rotatably connected to the mounting seat 10 through the first rotating shaft 23, so that the first rotating part 21 can rotate around the first rotating shaft 23 fixed in position. The second rotating shaft 24 and the third rotating shaft 25 are rotatably connected between the first rotating part 21 and the second rotating part 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 part 26 can be a guide groove provided on the mounting seat 10, or a track detachably connected to the mounting seat 10. The second rotating shaft 24 can be slidably matched with the first guide part 26. One end of the first guide part 26 is close to the first rotating shaft 23, and the other end is far 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 be slidably matched 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 be slidably matched with the first guide portion 26 and the second guide portion 27 at the same time, thereby driving the first rotating portion 21 to rotate relative to the mounting seat 10.

[0025] The driving unit 30 may provide a driving force to rotate the first rotating portion 21 and the second rotating portion 22 .

[0026] The locking assembly may include a first motion state and a second motion state.

[0027] 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 rotating shaft 23. In the first motion state, the first rotating part 21 and the second rotating part 22 can achieve rapid swinging.

[0028] The second motion state includes: the driving unit 30 drives the second rotating shaft 24 to move along the first guide portion 26 and the second guide portion 27, and the first guide portion 26 and the second guide portion 27 move relative to each other. In the projection of the locking assembly along the direction parallel to the first rotating shaft 23, there is an intersection between the first guide portion 26 and the second guide portion 27, the second rotating shaft 24 coincides with the position of the intersection, and the extension direction of the end of the second guide portion 27 away from the first rotating shaft 23 is the direction in which the first guide portion 26 departs from the third rotating shaft 25. Therefore, in the second motion state, during the process of the second rotating shaft 24 moving away from the first rotating shaft 23, the second rotating shaft 24 can drive the first rotating portion 21 to continue rotating around the first rotating shaft 23 through the pressing force on the second guide portion 27, thereby achieving further compression. According to the law of conservation of energy, the work done by the driving 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 driving unit 30 on the second rotating shaft 24, thereby amplifying the clamping force and ensuring a relatively stable clamping effect.

[0029] In addition, by controlling the angle between the tangent of the second guide portion 27 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 passing through the locking position and the first guide portion 26 can be controlled when the second rotating shaft 24 moves to the locking position. This angle is smaller than the self-locking angle, and the self-locking friction force can be used to hinder the second rotating shaft 24 from moving toward the first rotating shaft 23. The first rotating portion 21 can rely on the self-locking force under vibration conditions, so it is not easy to unlock, which reduces the performance requirements for the drive unit 30, improves the stability of locking and reduces costs. In addition, when the second rotating shaft 24 passes the locking position in the second motion state, it can continue to be slowly pressed, and it is always in a self-locking state during the slow pressing process.

[0030] Therefore, this embodiment solves the technical problems that the conventional battery box locking device has no pre-tightening force, no self-locking effect and small mechanical tolerance.

[0031] 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 may 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.

[0032] At this time, the first motion state may include: the first rotating shaft 23 is coaxial with the second rotating shaft 24, and the first rotating part 21 and the second rotating part 22 both swing rapidly around the first rotating shaft 23. At this time, the first guide part 26 and the second guide part 27 have only one intersection point. Figure 5It is shown that the first rotating shaft 23 and the second rotating shaft 24 are in a coaxial state during the rapid swinging stage.

[0033] The second motion state may 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 intersections, which correspond to the first rotating shaft 23 and the second rotating shaft 24 respectively. The extension direction of the end of the second guide portion 27 away from the first rotating shaft 23 is the direction in which the first guide portion 26 departs from the third rotating shaft 25. Therefore, in the second motion state, during the process of the second rotating shaft 24 moving away from the first rotating shaft 23, the second rotating shaft 24 can drive the first rotating portion 21 to continue rotating around the first rotating shaft 23 through the pressing force on the second guide portion 27, thereby achieving further compression.

[0034] In another embodiment, if Figure 8 As shown, the first guide portion 26 is in a straight line, and the second guide portion 27 is in an arc shape. 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.

[0035] The rotating unit 20 may further include a third guide portion 28, which is disposed on the mounting seat 10. The third guide portion 28 is in an arc shape with the first rotating shaft 23 as the center, and the end of the first guide portion 26 close to the first rotating shaft 23 is connected to one end of the third guide portion 28, so that when the second rotating shaft 24 swings rapidly around the first rotating shaft 23 in the first motion state, the second rotating shaft 24 slides along the third guide portion 28.

[0036] At this time, the first motion state may include: the first rotating shaft 23 is misaligned with the second rotating shaft 24, 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.

[0037] The second motion state may include: the first rotating shaft 23 is misaligned with the second rotating shaft 24, and the extension direction of the end of the second guide portion 27 away from the first rotating shaft 23 is the direction in which the first guide portion 26 is away from the third rotating shaft 25. Therefore, in the second motion state, when the second rotating shaft 24 slides upward along the first guide portion 26, the second rotating shaft 24 can drive the first rotating portion 21 to continue rotating around the first rotating shaft 23 through the pressing force on the second guide portion 27, thereby achieving further compression.

[0038] 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.

[0039] In yet another embodiment, Fig. 9 As shown, the first guide portion 26 is in a straight line shape, and the second guide portion 27 may also be in a straight line shape. The first rotating shaft 23 and the second rotating shaft 24 are both in a misaligned position in the first motion state and the second motion state, that is, the first rotating shaft 23 and the second rotating shaft 24 are not coaxial. The first rotating shaft 23 is misaligned with the second guide portion 27. The first guide portion 26 and the second guide portion 27 always have only one intersection point, which is the position of the second rotating shaft 24.

[0040] The rotating unit 20 may further include a third guide portion 28, which is disposed on the mounting seat 10. The third guide portion 28 is in an arc shape with the first rotating shaft 23 as the center, and the end of the first guide portion 26 close to the first rotating shaft 23 is connected to one end of the third guide portion 28, so that the second rotating shaft 24 can swing rapidly around the first rotating shaft 23 in the first motion state. The third guide portion 28 may be a guide groove provided on the mounting seat 10, or may be a track detachably connected to the mounting seat 10.

[0041] At this time, the first motion state may include: the first rotating shaft 23 is misaligned with the second rotating shaft 24, 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.

[0042] The second motion state may include: the first rotating shaft 23 and the second rotating shaft 24 are misaligned, and the extension direction of the end of the second guide portion 27 away from the first rotating shaft 23 is the direction in which the first guide portion 26 is away from the third rotating shaft 25. Therefore, in the second motion state, during the process of the second rotating shaft 24 sliding upward along the first guide portion 26, the second rotating shaft 24 can drive the first rotating portion 21 to continue rotating around the first rotating shaft 23 through the pressing force on the second guide portion 27, thereby achieving further slow compression. Moreover, during the slow compression process, the locking assembly is always in a self-locking state.

[0043] 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.

[0044] 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 force 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 of the battery box by the locking assembly more stable.

[0045] 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.

[0046] In this embodiment, if Figure 3 and Figure 6 As shown, the second rotating part 22 may include two rotating plates 221 and a connecting block 222 that are arranged opposite to each other. The connecting block 222 is detachably connected between the two rotating plates 221, the moving end of the driving part 31 is rotatably connected to the connecting block 222, and the first rotating part 21 is located between the two rotating plates 221. By using two identical rotating plates 221, two sets of first rotating shafts 23 can be symmetrically arranged, thereby improving the overall symmetry of the entire rotating unit 20 and improving the stability of operation.

[0047] 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, and the second rotating shaft 24 can be slidably matched with the fourth guide portion 29, and the third rotating shaft 25 is located on the extension line of the length direction of the fourth guiding portion 29. Therefore, the second rotating shaft 24 can move in the fourth guiding 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.

[0048] 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, after contacting the battery box frame 50, the clamping block 212 may rotate around the third rotating shaft 25 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.

[0049] In this embodiment, a battery box system is provided. The battery box system includes any locking assembly of the above embodiments, such as Fig.10 As shown, the battery box system may further include a bottom bracket 40 and a battery box frame 50 .

[0050] The bottom bracket 40 may be fixed on the vehicle, and the mounting seat 10 may be detachably connected to the bottom bracket 40 .

[0051] When the battery box frame 50 is locked on the bottom bracket 40 , the bottom portion of the battery box frame 50 is pressed between the first rotating portion 21 and the bottom bracket 40 , thereby fixing the battery box on the vehicle.

[0052] When the driving unit 30 drives the first rotating part 21 and the second rotating part 22 to rotate, the third rotating shaft 25 rotates toward or away from the battery box frame 50 .

[0053] In this embodiment, a vehicle is provided, the vehicle includes the battery box system in the above embodiment, such as Fig.11 As shown, the vehicle may further include a frame 60 and wheels 70 .

[0054] 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 wheel 70 is rotatably connected to the frame 60, and can drive the frame 60 to move.

[0055] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and 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 position of 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.

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 comprises a fourth guide portion, which is arranged 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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