Locking device and battery assembly

Abstract

The utility model belongs to the technical field of locks, and particularly relates to a locking device and a battery assembly. The locking device comprises a driving device, a buffering assembly and a spring bolt which are sequentially connected, the driving device drives the spring bolt to do reciprocating linear motion, the spring bolt stretches out for locking and the spring bolt retracts for unlocking, the buffering assembly is used for buffering when the spring bolt is clamped, the driving device comprises a motor, a lead screw and a nut, an output shaft of the motor is connected with the lead screw, and the nut is connected with the lead screw. The lead screw is connected with the nut through threads, and the length direction of the lead screw is parallel to the reciprocating linear motion direction of the spring bolt. The driving device of the locking device adopts the lead screw and the nut, and the rolling friction between the lead screw and the nut is far smaller than the sliding friction, so that the transmission efficiency of the lead screw mechanism is generally high, and the service life is generally long. The length direction of the lead screw is parallel to the reciprocating linear motion direction of the spring bolt, so that the locking device is relatively compact in structure and small in occupied space.

Description

Technical Field

[0001] The utility model belongs to the technical field of locks, and in particular relates to a locking device and a battery assembly. Background Art

[0002] Chinese patent document CN209556599U discloses an embedded electric control lock, whose electric opening and closing lock power device includes a motor and a power slider, the motor is fixedly mounted on a mounting plate by fasteners, the power slider includes symmetrically arranged guide wing plates, power arms and racks, one of the guide wing plates is inserted into a first guide groove at the bottom of a first shell, and the other guide wing plate extends through the mounting plate into the second shell and cooperates with a second guide groove inside the second shell; a guide rod parallel to the lock rod is arranged in the first shell, and the power slider is slidably mounted on the guide rod; the output shaft of the motor is connected to a worm gear pair, the worm gear pair is connected to a reduction gear pair, the small gear of the reduction gear pair is coaxially mounted with the worm wheel of the worm gear pair, the large gear of the reduction gear pair is mounted on a power output shaft, a power output wheel is mounted on the power output shaft, and the power output wheel is meshed with a linear rack on the power slider.

[0003] However, the electric opening and closing locking power device uses a worm gear pair and a reduction gear pair, which occupies a large space, which is not conducive to installation on a battery assembly with a high degree of integration. In addition, the transmission efficiency of the worm gear pair is relatively low, which increases power consumption.

[0004] Therefore, the existing technology needs to be improved and developed. Utility Model Content

[0005] The purpose of the present application is to provide a locking device and a battery assembly, which can improve the transmission efficiency and reduce the space occupied by the locking device.

[0006] In order to solve the above-mentioned technical problems, the present application provides a locking device, including a driving device, a buffer assembly and a lock tongue connected in sequence, the driving device drives the lock tongue to reciprocate linearly, the lock tongue extends to lock, and the lock tongue retracts to unlock, the buffer assembly is used to buffer the lock tongue when it is stuck, the driving device includes a motor, a lead screw and a nut, the output shaft of the motor is connected to the lead screw, the lead screw and the nut are connected by threads, and the length direction of the lead screw is parallel to the direction of the reciprocating linear motion of the lock tongue.

[0007] Furthermore, the buffer assembly includes a first connecting member, a second connecting member and an elastic member, the first connecting member is slidingly connected to the second connecting member, one end of the elastic member is connected to the first connecting member, and the other end of the elastic member is connected to the second connecting member.

[0008] Furthermore, the elastic member is a compression spring, the length of the compression spring is greater than or equal to half the length of the first connecting member, and the spring diameter of the compression spring is less than or equal to 0.5 mm.

[0009] Furthermore, the first connecting member is provided with a mounting groove, and the elastic member is installed in the mounting groove.

[0010] Furthermore, the first connecting member is provided with a movable groove perpendicular to the direction of the reciprocating linear motion, and the second connecting member is provided with a stopper, and the stopper slides in the movable groove.

[0011] Furthermore, the movable groove is semi-closed, and a first limiting surface is formed on the movable groove. One end of the elastic member abuts against the first connecting member, and the other end of the elastic member abuts against the second connecting member. During the retraction of the lock tongue, the block abuts against the first limiting surface.

[0012] Furthermore, the movable groove is open, one end of the elastic member is fixedly connected to the first connecting member, and the other end of the elastic member is fixedly connected to the second connecting member.

[0013] Furthermore, it also includes a state detection device, which includes a magnet and a first Hall element and a second Hall element respectively arranged on a circuit board, the magnet is arranged on the buffer component or the lock tongue, and the unlocked state is obtained when the magnet on the buffer component or the lock tongue moves to be relative to the first Hall element, and the locked state is obtained when the magnet on the buffer component or the lock tongue moves to be relative to the second Hall element.

[0014] Furthermore, the driving device is arranged above the buffer assembly.

[0015] Furthermore, the first connecting member is provided with a first connecting groove, and the first connecting groove is connected to the nut.

[0016] Furthermore, it also includes a shell, a cover plate and a mounting plate, the driving device, the buffer assembly and the lock tongue are installed in the shell, the shell is sealed with the cover plate, the shell is provided with a second through hole, the mounting plate is provided with a third through hole, and the lock tongue extends from or retracts from the second through hole and the third through hole.

[0017] Furthermore, it also includes a forced unlocking device for forcibly retracting the lock tongue, and one end of the forced unlocking device is connected to the lock tongue.

[0018] The present application also provides a battery assembly, comprising the above-mentioned locking device, wherein the battery assembly is provided with a first through hole, a locking tongue of the locking device extends out of the first through hole for locking, and the locking tongue retracts into the first through hole for unlocking.

[0019] As can be seen from the above, the driving device of the locking device adopts a screw and a nut. Since the rolling friction between the screw and the nut is much smaller than the sliding friction, the transmission efficiency of the screw mechanism is usually very high and the service life is usually long. The length direction of the screw is parallel to the direction of the reciprocating linear motion of the lock tongue, so that the structure of the locking device is relatively compact and occupies a small space. The screw mechanism can achieve very precise linear motion and is suitable for locking devices that require high-precision positioning.

[0020] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a three-dimensional diagram of the battery assembly of Example 1.

[0022] Figure 2 This is a three-dimensional diagram of the battery assembly of Example 1 (the handle is hidden).

[0023] Figure 3 It is a three-dimensional diagram of the locking device of Example 1 in the extended state.

[0024] Figure 4 It is a stereoscopic view of the locking device of Example 1 in the retracted state.

[0025] Figure 5 This is an exploded view of the locking device of Example 1.

[0026] Figure 6 This is a three-dimensional diagram of the drive device, buffer assembly, and lock tongue of Example 1 (lock tongue extended).

[0027] Figure 7 This is a three-dimensional diagram of the buffer component of Example 1.

[0028] Figure 8 This is a three-dimensional diagram of the drive device, buffer assembly, and lock tongue of Example 1 (lock tongue retracted state).

[0029] Fig. 9 It is a three-dimensional diagram of the driving device, buffer assembly, and lock tongue of Example 1 (lock tongue stuck state).

[0030] Fig.10 It is a stereoscopic diagram of the buffer assembly and the forced unlocking device of Example 1.

[0031] Fig.11 This is a three-dimensional diagram of the state detection device, drive device, buffer assembly, and lock tongue of Example 1 (lock tongue extended state).

[0032] Fig.12 This is a three-dimensional diagram of the state detection device, drive device, buffer assembly, and lock tongue of Example 1 (lock tongue retracted state).

[0033] Fig.13 This is a three-dimensional diagram of the buffer assembly of Example 2.

[0034] Description of labels:

[0035] 1-battery assembly, 11-battery body, 12-handle, 2-first through hole, 3-locking device, 31-cover plate, 32-housing, 321-second through hole, 33-mounting plate, 331-mounting hole, 332-third through hole, 34-driving device, 341-motor, 342-screw, 343-nut, 35-buffer assembly, 351-first connecting member, 3511-mounting slot, 3512-first connecting slot, 3513-movable slot, 35131-first limiting surface, 35132-second limiting surface, 3514-avoidance groove, 3515-fixing groove, 352-second connecting piece, 3521-stop block, 3522-second connecting groove, 3523-boss, 353-elastic piece, 36-lock tongue, 37-forced unlocking device, 38-state detection device, 381-circuit board, 382-first Hall element, 383-second Hall element, 384-magnet, 39-buffer pad. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0038] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0041] Example 1

[0042] Figure 1 A perspective view of the battery assembly 1 is shown. Figure 2 It is a three-dimensional diagram of the battery assembly 1 (the handle 12 is hidden). The battery assembly 1 can be used in electric vehicles, such as electric bicycles, electric motorcycles, and electric-assisted bicycles, and can also be used in shared battery exchange cabinets. When used in an electric vehicle, the user uses a smart terminal to unlock the locking device 3, and can remove the exhausted battery from the electric vehicle and take it for charging; after the fully charged battery is loaded into the electric vehicle, the user uses a smart terminal to lock the locking device 3 to fix the battery assembly 1 to the electric vehicle. When used in a shared power exchange cabinet, the user uses a smart terminal to unlock the locking device 3, and can remove the fully charged battery from the shared power exchange cabinet and load it into the electric vehicle for use. The user uses a smart terminal to lock the locking device 3 to fix the battery assembly 1 to the shared power exchange cabinet.

[0043] The battery assembly 1 includes a battery body 11 and a handle portion 12. The battery body 11 is located below the handle portion 12. Electrodes are provided at the bottom of the battery body 11. The battery assembly 1 is inserted into the interface of an electric vehicle or a shared battery exchange cabinet to supply power or charge. A cavity is provided on the top surface of the battery body 11 and the bottom surface of the handle portion 12. A battery management system (Battery Management System) is installed inside. The battery management system is used to intelligently monitor the battery's temperature, charge and discharge status, and health status. A locking device 3 is also fixedly installed in the cavity. In order to allow the locking tongue 36 of the locking device 3 to extend, a first through hole 2 is provided on the outer surface of the battery assembly 1. In the present embodiment, the first through hole 2 is divided into two, one part is provided on the battery body 11, and the other part is provided on the handle portion 12. As shown in FIG. Figure 3 As shown, the locking tongue 36 of the locking device 3 can extend out of the first through hole 2 and lock with the fixed object; Figure 4 As shown, the locking tongue 36 of the locking device 3 can be retracted and unlocked from the fixed object. The fixed object can be the frame of the electric vehicle or the cabinet of the shared power exchange cabinet.

[0044] Figure 5: is an exploded view of the locking device 3. The locking device 3 includes a shell 32, a cover plate 31 and a mounting plate 33. The shell 32 is a metal hollow shell structure with an opening at the top, a second through hole 321 is arranged on the side, a driving device 34, a buffer assembly 35 and a locking tongue 36 are installed inside, the shell 32 is sealed with the cover plate 31 to improve the sealing performance, the mounting plate 33 is fixedly connected with the shell 32, the mounting plate 33 is an L-shaped thin plate structure, a mounting hole 331 is arranged at the bottom of the mounting plate 33, the mounting plate 33 and the shell 32 are fixed to the top surface of the battery body 11 by screws passing through the mounting hole 331, a third through hole 332 is arranged on the side of the mounting plate 33, and the cross-sectional shapes of the first through hole 2, the second through hole 321 and the third through hole 332 are equal, and are slightly larger than the cross-sectional shape of the locking tongue 36. The mounting plate 33 has two functions. The first function is to fix the locking device 3 on the battery body 11. The second function is to enhance the ability to resist external forces. When the locking tongue 36 is subjected to vertical upward or downward forces, the mounting plate 33 provides a certain support force to the locking tongue 36 to reduce the deformation of the housing 32. The locking tongue 36 can extend or retract through the first through hole 2, the second through hole 321, and the third through hole 332.

[0045] The driving device 34 includes a motor 341, a lead screw 342 and a nut 343. The motor 341 is fixedly mounted on the housing 32. The output shaft of the motor 341 is fixedly connected to the lead screw 342. The other end of the lead screw 342 is supported by the housing 32. The lead screw 342 and the nut 343 are connected by threads. When the motor 341 rotates forward, the nut 343 moves to the second position in the direction close to the motor 341. Figure 6 As shown, the nut 343 drives the buffer assembly 35 and the lock tongue 36 to extend; when the motor 341 rotates in the reverse direction, the nut 343 moves away from the motor 341 to the first position, as shown in FIG. Figure 8 As shown, the nut 343 drives the buffer assembly 35 and the locking tongue 36 to retract. It should be noted that the forward rotation direction and the reverse rotation direction of the motor 341 can be interchanged.

[0046] Since the rolling friction between the lead screw 342 and the nut 343 is much smaller than the sliding friction, the transmission efficiency of the lead screw mechanism is usually very high and the service life is usually long. The structure of the lead screw mechanism is relatively compact and occupies a small space, so that the structure of the locking device 3 is relatively compact and occupies a small space. The lead screw mechanism can achieve very precise linear motion and is suitable for locking devices 3 that require high-precision positioning.

[0047] In order to reduce the volume of the driving device 34, in the present embodiment, the lead screw 342 is coaxially fixed with the output shaft of the motor 341, the length direction of the lead screw 342 is parallel to the direction of the reciprocating linear motion of the locking tongue 36, and the driving device 34 is arranged above the buffer assembly 35. The driving device 34 is in the shape of a rectangular parallelepiped as a whole, and is much smaller in volume than the worm gear mechanism.

[0048] When the lock tongue 36 is extended or retracted, it may be blocked or clamped by an obstruction, causing the lock tongue 36 to be unable to extend or retract, that is, a jamming phenomenon occurs. A buffer component 35 is provided between the drive device 34 and the lock tongue 36 to provide a buffer when jamming occurs.

[0049] Figure 7 3D is a perspective view of the buffer assembly 35. The buffer assembly 35 includes a first connecting member 351, a second connecting member 352 and an elastic member 353. The first connecting member 351 is slidably connected to the second connecting member 352. One end of the elastic member 353 abuts against the first connecting member 351, and the other end of the elastic member 353 abuts against the second connecting member 352.

[0050] The first connecting member 351 is a rectangular parallelepiped structure. The first connecting member 351 is provided with a mounting groove 3511 which opens upward. An elastic member 353 is installed in the mounting groove 3511. The first connecting member 351 is also provided with a first connecting groove 3512. The first connecting groove 3512 is used to be plugged with the nut 343 of the driving device 34 so that the nut 343 and the first connecting member 351 are fixed. In order to make the first connecting member 351 and the second connecting member 352 slidably connected, a movable groove 3513 perpendicular to the direction of reciprocating linear motion is opened on the side of the first connecting member 351. The movable groove 3513 is vertically connected with the mounting groove 3511. In this embodiment, the movable groove 3513 is a semi-closed groove. Semi-closed means that one side of the movable groove 3513 is open, that is, the upper side of the movable groove 3513 is open. The semi-closed movable groove 3513 is formed with a first limiting surface 35131 and a second limiting surface 35132 which are opposite to each other. A stopper 3521 is provided at one end of the second connecting member 352, and a second connecting groove 3522 is provided at the other end. The second connecting groove 3522 is used for detachable connection with the locking tongue 36. The bottom surface of the stopper 3521 contacts the bottom surface of the movable groove 3513, and the stopper 3521 can slide in the movable groove 3513.

[0051] When there is no jamming phenomenon, the elastic member 353 is in a free extension state. Figure 8 As shown, the stopper 3521 abuts against the first limiting surface 35131 of the movable groove 3513, and when the nut 343 moves from the first position to the second position, the stopper 3521 always abuts against the first limiting surface 35131 of the movable groove 3513, and the locking tongue 36 extends normally; if a jamming phenomenon occurs, such as Fig. 9As shown, the lock tongue 36 is blocked or clamped by a foreign object, the lock tongue 36 cannot move, the nut 343 moves from the first position to the second position, driving the first connecting member 351 to move, the elastic member 353 is compressed, the block 3521 is separated from the first limiting surface 35131 of the movable groove 3513, and slides toward the second limiting surface 35132 of the movable groove 3513. The elastic member 353 absorbs energy for buffering during the compression process. When the obstruction no longer blocks or clamps the lock tongue 36, the elastic member 353 releases the elastic force to extend the lock tongue 36.

[0052] The elastic member 353 can be an elastic part such as a spring or rubber. In the present embodiment, the elastic member 353 is a compression spring. The resistance of the lock tongue 36 being blocked or clamped by foreign objects is not large. In order to make the compression spring work more sensitively, the spring wire diameter of the compression spring can be selected to be less than or equal to 0.5 mm. Preferably, the spring wire diameter of the compression spring is 0.4 mm, the length is 30 mm, and the length of the first connecting member 351 is 38 mm. The length of the compression spring is greater than or equal to half of the length of the first connecting member 351. The longer the length of the compression spring, the more sensitive the compression spring response is under the premise of the same resistance.

[0053] In some special cases, the battery body 11 may be exhausted or the driving device 34 may be damaged, which may result in the motor 341 of the driving device 34 not being able to work properly, and thus the battery assembly 1 and the fixed object cannot be unlocked, and the battery body 11 cannot be properly disassembled for repair. In order to solve the above problem, the locking device 3 is also used for forcing the lock tongue 36 to retract. One end of the forced unlocking device 37 is connected to the lock tongue 36. In this embodiment, if Fig.10 As shown, the forced unlocking device 37 is a thin rope. In order to connect with the lock tongue 36, the first connecting member 351 is provided with an escape groove 3514 that runs through the length direction of the first connecting member 351. The thin rope passes through the hole of the housing 32, the escape groove 3514 of the first connecting member 351, and the hollow structure of the elastic member 353 in sequence to be fixedly connected with the lock tongue 36. If the battery assembly 1 and the fixed object cannot be unlocked, the lock tongue 36 can be forced to retract by pulling the thin rope.

[0054] The stopper 3521 may also partially extend to one side, and the thin rope may also be fixedly connected to the extended portion of the stopper 3521 . This method does not require the avoidance groove 3514 to be provided.

[0055] In order to obtain the state of the locking device 3, so that the user can understand the locking or unlocking state of the locking device 3 through the smart terminal, a state detection device 38 is added. Fig.11 It is a three-dimensional diagram of the state detection device 38, the driving device 34, the buffer assembly 35, and the lock tongue 36 (the lock tongue 36 is in the extended state). Fig.12The following is a three-dimensional diagram of the state detection device 38, the drive device 34, the buffer assembly 35, and the lock tongue 36 of Example 2 (the lock tongue 36 is in the retracted state). The state detection device 38 includes a first Hall element 382, ​​a second Hall element 383, and a magnet 384. The first Hall element 382 and the second Hall element 383 are welded on a circuit board 381 with an integrated controller. The circuit board 381 is vertically mounted on the side of the first connecting member 351. The first Hall element 382 and the second Hall element 383 are mounted on the side facing the nut 343. Fig.11 and Fig.12 The dotted box in FIG. 3 shows that the magnet 384 can be disposed on the buffer assembly 35 or the lock tongue 36. In this embodiment, the magnet 384 is mounted on the side of the first connecting member 351 facing the circuit board 381. Fig.11 and Fig.12 When the motor 341 rotates in the forward direction, the nut 343 moves to the second position in the direction close to the motor 341, as shown in FIG. Fig.11 As shown, the magnet 384 of the first connecting member 351 is directly opposite to the second Hall element 383, and the distance between the magnet 384 and the second Hall element 383 is the shortest. The second Hall element 383 senses the magnetic field of the magnet 384, and the second Hall element 383 sends an electrical signal to the controller and defines this state as a locked state; when the motor 341 rotates in the reverse direction, the nut 343 moves to the first position in the direction away from the motor 341, as shown in FIG. Fig.12 As shown, the magnet 384 of the first connecting member 351 is directly opposite to the first Hall element 382, ​​and the distance between the magnet 384 and the first Hall element 382 is the shortest. The first Hall element 382 senses the magnetic field of the magnet 384, and the first Hall element 382 sends an electrical signal to the controller and defines the state as the unlocked state. In this way, the extension or retraction of the lock tongue 36 can be indirectly detected, and the locked or unlocked state of the locking device 3 can be obtained.

[0056] The magnet 384 can also be arranged on the stopper 3521 of the second connecting member 352. Since the second connecting member 352 and the lock tongue 36 are rigidly connected, the extension or retraction of the lock tongue 36 can be directly detected, thereby obtaining the locked or unlocked state of the locking device 3. Correspondingly, the setting position of the circuit board 381 needs to match the setting position of the magnet 384. Similarly, the magnet 384 can also be directly arranged on the lock tongue 36.

[0057] Example 2

[0058] In the buffer assembly 35 of Example 1, the buffer assembly 35 can only achieve one-way buffering, that is, the lock tongue 36 is blocked or clamped by foreign objects, the lock tongue 36 cannot move, the nut 343 moves from the first position to the second position, and the compression spring of the buffer assembly 35 is compressed to buffer, while the nut 343 moves from the second position to the first position, and the compression spring of the buffer assembly 35 is not compressed and cannot buffer.

[0059] In order to achieve bidirectional buffering, in this embodiment, the movable groove 3513 of the first connecting member 351 is open, that is, it runs through the left side of the first connecting member 351, and only has the second limiting surface 35132, and the second connecting member 352 is also provided with a boss 3523, one end of the compression spring is clamped into the boss 3523 and fixedly connected to the second connecting member 352, and the first connecting member 351 is also provided with a fixed groove 3515, the fixed groove 3515 is located between the movable groove 3513 and the first connecting groove 3512, and the other end of the compression spring is clamped into the fixed groove 3515 and fixedly connected to the first connecting member 351. The locking tongue 36 is blocked or clamped by foreign matter, and the locking tongue 36 cannot move. The nut 343 moves from the first position to the second position, and the compression spring of the buffer assembly 35 can be compressed to buffer. The nut 343 moves from the second position to the first position. Since there is no restriction of the first limiting surface 35131 in Example 1, the compression spring of the buffer assembly 35 can be stretched, and can also buffer.

[0060] The first connecting member 351 and the nut 343 may collide with other parts during movement. A buffer pad 39 is provided between the nut 343 seat and the motor 341 and between the housing 32 and the first connecting member 351 to achieve a buffering effect.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0062] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A locking device, characterized in that: The invention comprises a driving device (34), a buffer assembly (35) and a locking tongue (36) which are connected in sequence, wherein the driving device (34) drives the locking tongue (36) to reciprocate linearly, the locking tongue (36) extends to lock, and the locking tongue (36) retracts to unlock, and the buffer assembly (35) is used for buffering the locking tongue (36) when it is stuck, and the driving device (34) comprises a motor (341), a lead screw (342) and a nut (343), the output shaft of the motor (341) is connected to the lead screw (342), the lead screw (342) and the nut (343) are connected by threads, and the length direction of the lead screw (342) is parallel to the direction of the reciprocating linear motion of the locking tongue (36).

2. The locking device according to claim 1, characterized in that: The buffer assembly (35) comprises a first connecting member (351), a second connecting member (352) and an elastic member (353); the first connecting member (351) is slidably connected to the second connecting member (352); one end of the elastic member (353) is connected to the first connecting member (351); and the other end of the elastic member (353) is connected to the second connecting member (352).

3. The locking device according to claim 2, characterized in that: The elastic member (353) is a compression spring, the length of the compression spring is greater than or equal to half the length of the first connecting member (351), and the spring diameter of the compression spring is less than or equal to 0.5 mm.

4. The locking device according to claim 2, characterized in that: The first connecting member (351) is provided with a mounting groove (3511), and the elastic member (353) is mounted in the mounting groove (3511).

5. The locking device according to claim 2, characterized in that: The first connecting member (351) is provided with a movable groove (3513) perpendicular to the direction of reciprocating linear motion, and the second connecting member (352) is provided with a stopper (3521), and the stopper (3521) slides in the movable groove (3513).

6. The locking device according to claim 5, characterized in that: The movable groove (3513) is semi-closed, and a first limiting surface (35131) is formed on the movable groove (3513). One end of the elastic member (353) abuts against the first connecting member (351), and the other end of the elastic member (353) abuts against the second connecting member (352). When the locking tongue (36) retracts, the stopper (3521) abuts against the first limiting surface (35131).

7. The locking device according to claim 5, characterized in that: The movable groove (3513) is open, one end of the elastic member (353) is fixedly connected to the first connecting member (351), and the other end of the elastic member (353) is fixedly connected to the second connecting member (352).

8. The locking device according to claim 1, characterized in that: The invention also comprises a state detection device (38), wherein the state detection device (38) comprises a magnet (384) and a first Hall element (382) and a second Hall element (383) respectively arranged on a circuit board (381); the magnet (384) is arranged on the buffer component (35) or the lock tongue (36); when the magnet (384) on the buffer component (35) or the lock tongue (36) moves to be opposite to the first Hall element (382), an unlocked state is obtained; when the magnet (384) on the buffer component (35) or the lock tongue (36) moves to be opposite to the second Hall element (383), a locked state is obtained.

9. The locking device according to claim 1, characterized in that: The driving device (34) is arranged above the buffer assembly (35).

10. The locking device according to claim 2, characterized in that: The first connecting member (351) is provided with a first connecting groove (3512), and the first connecting groove (3512) is connected to the nut (343).

11. The locking device according to claim 1, characterized in that: The invention also comprises a shell (32), a cover plate (31) and a mounting plate (33); the driving device (34), the buffer assembly (35) and the locking tongue (36) are mounted in the shell (32); the shell (32) and the cover plate (31) are sealed together; the shell (32) is provided with a second through hole (321); the mounting plate (33) is provided with a third through hole (332); and the locking tongue (36) extends out of or retracts from the second through hole (321) and the third through hole (332).

12. The locking device according to claim 1, characterized in that: It also comprises a forced unlocking device (37) for forcibly retracting the locking tongue (36), one end of which is connected to the locking tongue (36).

13. A battery assembly, characterized in that: The battery assembly (1) comprises a locking device (3) as claimed in any one of claims 1 to 12, wherein the battery assembly (1) is provided with a first through hole (2), a locking tongue (36) of the locking device (3) extends out of the first through hole (2) for locking, and the locking tongue (36) retracts into the first through hole (2) for unlocking.

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