Self-locking mechanism and box components

Abstract

The present invention relates to a self-locking mechanism and a box assembly. The self-locking mechanism includes a lock seat, a lock tongue, an elastic member and a control part; the lock tongue and the control part are both arranged on the lock seat, and the lock tongue is movable relative to the lock seat in a first direction, and the control part is slidable relative to the lock seat in a second direction; the control part is connected to the lock tongue, and the contact part of the control part connected to the lock tongue is an inclined surface and / or the contact part of the lock tongue connected to the control part is an inclined surface, and the inclined surface is inclined compared to the first direction; when the control part slides in the second direction, the contact part of the control part connected to the lock tongue acts on the lock tongue, so that the lock tongue moves along the first direction into the lock hole; the elastic member is connected between the lock tongue and the lock seat, and is used to act on the lock tongue with its own elastic force, so that the lock tongue tends to reset and retracts from the lock hole.

Description

Technical Field

[0001] The invention relates to the technical field of locking and unlocking, and in particular to a self-locking mechanism and a box assembly. Background Art

[0002] A home energy storage system generally includes a battery box and an electric control box. In an existing home energy storage system, the electric control box and the battery box are generally stacked up and down. This type of home storage system is popular because the battery box at the bottom can stack several battery boxes according to actual capacity requirements. When different battery boxes and electric control boxes are stacked up and down, the battery box or electric control box on the upper layer is usually designed with a boss on one side and a groove on the other side. During installation, as long as the boss and the groove are aligned, the two can be accurately aligned and the upper box can be prevented from moving.

[0003] The above-mentioned stacked energy storage box has the following problems in actual use: the above-mentioned boss and groove structure is arranged on the connecting surface of the upper and lower boxes, which can only limit the lateral movement of the upper box, but the vertical freedom cannot be restricted, resulting in poor fixing effect of the upper box and the upper box is at risk of being knocked down by foreign objects. Summary of the invention

[0004] The present invention provides a self-locking mechanism and a box assembly to solve the technical problem in the prior art that the locking between energy storage boxes is not firm and is prone to being knocked down and falling off.

[0005] The self-locking mechanism provided by the present invention comprises a lock seat, a lock tongue, an elastic member and a control part; the lock tongue and the control part are both arranged on the lock seat, and the lock tongue is movable in a first direction relative to the lock seat, and the control part is slidable in a second direction relative to the lock seat; the control part is connected to the lock tongue, and the contact part of the control part connected to the lock tongue is an inclined surface and / or the contact part of the lock tongue connected to the control part is an inclined surface, and the inclined surface is inclined compared to the first direction; when the control part slides in the second direction, the contact part of the control part connected to the lock tongue acts on the lock tongue, so that the lock tongue moves into the lock hole along the first direction; the elastic member is connected between the lock tongue and the lock seat, and is used to act on the lock tongue with its own elastic force, so that the lock tongue tends to reset and retracts from the lock hole.

[0006] Among them, the locking tongue includes a head end portion, a tail end portion and a connecting portion connecting the head end portion and the tail end portion together; the lock seat is provided with a mounting hole penetrating along a first direction; the connecting portion is inserted into the mounting hole; the head end portion and the tail end portion are respectively located on both sides of the mounting hole; the head end portion has a protruding step surface at the junction with the connecting portion; the elastic member is a spring, and the spring is sleeved on the outside of the connecting portion, one end of the spring is against the step surface, and the other end is against the lock seat; the tail end portion is provided with the inclined surface connected to the control portion.

[0007] Wherein, the rear end portion and the connecting portion of the locking tongue are split structures, and the two are fixedly connected; and / or, the front end portion and the connecting portion of the locking tongue are split structures, and the two are fixedly connected.

[0008] Wherein, one of the control part and the lock seat is provided with a slide groove along the second direction, and the other is provided with a slide rail corresponding to the slide groove.

[0009] Wherein, the inclined surface connecting the control portion and the locking tongue is a conical inclined surface or a truncated cone inclined surface.

[0010] The control part is rotatably connected to the lock seat, and a rotation plane of the control part relative to the lock seat is perpendicular to the first direction.

[0011] Wherein, the control part is also provided with a handle part.

[0012] The box assembly provided by the present invention includes at least one group of boxes, each group of boxes includes a first box and a second box that are stacked, the side of the first box is provided with the above-mentioned self-locking mechanism, and the second box is provided with a lock hole corresponding to the lock tongue of the self-locking mechanism.

[0013] Wherein, one of the first box and the second box is a battery box, and the other is a battery box or an electric control box.

[0014] There are multiple self-locking mechanisms arranged on the first box body, and the multiple self-locking mechanisms are arranged on at least two side surfaces of the first box body.

[0015] The self-locking mechanism and box assembly provided by the present invention have the following advantages compared with the prior art:

[0016] The self-locking mechanism and box assembly provided by the present invention have a control part for controlling the movement of the lock tongue that slides along the second direction. When the control part moves along the second direction, the contact part of the control part that is in contact with the lock tongue acts on the lock tongue, causing the lock tongue to retract from the lock hole in the first direction. When the control part does not apply force to the lock tongue, the lock tongue will extend into the lock hole under the action of the elastic member. In the above-mentioned self-locking mechanism, the extension direction of the lock tongue and the sliding direction of the control part are in different directions, which makes it easy to set the self-locking mechanism on the side of the box assembly. Specifically, for the first box and the second box in the box assembly, when the self-locking mechanism is set on the side of the first box, the lock tongue of the self-locking mechanism can be inserted into the lock hole set on the side of the second box. For the second box, it is fixed in multiple directions by the lock tongue of the self-locking mechanism, so that a good locking effect can be achieved between the first box and the second box. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a structural schematic diagram of the self-locking mechanism in an embodiment of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the self-locking mechanism shown;

[0021] Figure 3 for Figure 1 The self-locking mechanism shown is used for the structural schematic diagram of the box assembly;

[0022] Figure 4 for Figure 1 A schematic diagram of a state in which the self-locking mechanism locks the first box body and the second box body of the box body assembly;

[0023] Figure 5 for Figure 1 A schematic diagram of a state in which the self-locking mechanism unlocks the first box body and the second box body of the box body assembly;

[0024] Figure 6 for Figure 4 The enlarged schematic diagram of the middle A part;

[0025] Figure 7 for Figure 5 Enlarged schematic diagram of part B in the middle.

[0026] In the figure:

[0027] 10-Self-locking mechanism;

[0028] 11-lock seat; 111-mounting hole; 112-slide rail;

[0029] 12-locking tongue; 121-head end; 1211-step surface; 122-end end; 123-connecting part;

[0030] 13- elastic member;

[0031] 14-control part; 141-slideway; 142-handle part;

[0032] 20-first box;

[0033] 30-second box; 31-locking hole. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The following describes the embodiments of the self-locking mechanism and the box assembly provided by the present invention in conjunction with the accompanying drawings.

[0036] In one embodiment of the self-locking mechanism of the present invention, Figure 1 and Figure 2As shown, the self-locking mechanism 10 includes a lock seat 11, a lock tongue 12, an elastic member 13 and a control portion 14; the lock tongue 12 and the control portion 14 are both arranged on the lock seat 11, and the lock tongue 12 is movable along a first direction relative to the lock seat 11, and the control portion 14 is slidable along a second direction relative to the lock seat 11; the control portion 14 is connected to the lock tongue 12, and the contact portion of the control portion 14 connected to the lock tongue 12 is an inclined surface and / or the contact portion of the lock tongue 12 connected to the control portion 14 is an inclined surface. The contact portion is an inclined surface, and the inclined surface (the inclined surface of the control portion 14 and / or the inclined surface of the lock tongue 12) is inclined compared to the first direction; when the control portion 14 slides along the second direction, the contact portion of the control portion 14 connected to the lock tongue 12 acts on the lock tongue 12, so that the lock tongue 12 moves into the lock hole along the first direction; the elastic member 13 is connected between the lock tongue 12 and the lock seat 11, and is used to act on the lock tongue 12 with its own elastic force, so that the lock tongue 12 tends to reset and retract from the lock hole.

[0037] In the specific description and explanation of the subsequent content, the contact portion of the control part 14 connected to the lock tongue 12 and the contact portion of the lock tongue 12 connected to the control part 14 are both inclined surfaces. The case where only the contact portion of the control part 14 connected to the lock tongue 12 is an inclined surface, or only the contact portion of the lock tongue 12 connected to the control part 14 is an inclined surface is similar to the case where both are inclined surfaces, and no further description is given.

[0038] In this embodiment, if Figure 3 to Figure 7 As shown, the self-locking mechanism 10 can, for example, realize locking and unlocking in a box assembly consisting of a first box 20 and a second box 30 stacked in a vertical direction. The self-locking mechanism 10 can be specifically arranged on the first box 20, and a corresponding lock hole is arranged on the second box 30.

[0039] In this embodiment, the lock tongue 12 is used to lock or unlock the second box 30. The lock tongue 12 is arranged on the lock seat 11, and can move in a first direction relative to the lock seat 11; when the lock tongue 12 is extended, the lock tongue 12 can be inserted into the lock hole on the second box 30, thereby locking the second box 30; and when the lock tongue 12 is retracted, the lock tongue 12 leaves the lock hole 31 of the second box 30, thereby unlocking the second box 30.

[0040] In this embodiment, the control part 14 is used to control the state of the lock tongue 12, mainly to control the retraction of the lock tongue 12. The control part 14 is arranged on the lock seat 11, and can slide relative to the lock seat 11 in the second direction; at the same time, the control part 14 and the lock tongue 12 also have a relationship of connecting the inclined surfaces. When the control part 14 slides in the second direction, the control part 14 and the lock tongue 12 will interact with each other at the inclined surface where the two are connected. Specifically, the inclined surface of the control part 14 connected to the lock tongue 12 will apply a force to the lock tongue 12, so that the lock tongue 12 moves in the first direction, that is, the lock tongue 12 is extended and retracted in the first direction. In this embodiment, the force applied by the inclined surface of the control part 14 connected to the lock tongue 12 on the lock tongue 12 is in the direction of its rear end (that is, the direction of retraction). Under the action of this force, the lock tongue 12 will retract backwards. At this time, the lock tongue 12 will leave the lock hole 31 of the second box 30, and the second box 30 will be unlocked. In the above process, when the control part 14 controls the extension and retraction of the lock tongue 12 by sliding itself, the extension and retraction direction of the lock tongue 12 and the sliding direction of the control part 14 are in different directions.

[0041] Specifically, the inclination angle α of the inclined surfaces connecting each other on the locking tongue 12 and the control portion 14 relative to the first direction may be 30-45°.

[0042] In this embodiment, the elastic member 13 is arranged between the lock seat 11 and the lock tongue 12, and is used to control the lock tongue 12 to extend (when the control unit 14 does not apply a force to the lock tongue 12). In the process of the control unit 14 applying a force to the lock tongue 12 to make the lock tongue 12 retract backward, the elastic force of the elastic member 13 is overcome, and the elastic member 13 is subjected to the above force and deforms in the process, accumulating elastic potential energy. When the control unit 14 stops applying a force to the lock tongue 12, the elastic potential energy accumulated by the elastic member 13 is released, and the elastic force of the elastic member 13 itself will be applied to the lock tongue 12. Under this action, the lock tongue 12 will extend outward. At this time, the lock tongue 12 will be inserted into the lock hole 31 of the second box body 30, and the second box body 30 will be locked.

[0043] In the self-locking mechanism of this embodiment, the control part 14 for controlling the movement of the lock tongue 12 slides along the second direction. When the control part 14 moves along the second direction, the contact part of the control part 14 connected with the lock tongue 12 acts on the lock tongue 12, so that the lock tongue 12 retracts from the lock hole in the first direction. When the control part 14 does not apply force to the lock tongue 12, the lock tongue 12 will extend into the lock hole under the action of the elastic member 13. In the above self-locking mechanism, the extension direction of the lock tongue 12 and the sliding direction of the control part 14 are in different directions, so that the self-locking mechanism 10 is conveniently arranged on the side of the box assembly. Specifically, for the first box body 20 and the second box body 30 in the box body assembly, when the self-locking mechanism 10 is set on the side of the first box body 20, the locking tongue 12 of the self-locking mechanism 10 can be inserted into the locking hole 31 set on the side of the second box body 30. For the second box body 30, it is fixed in multiple directions by the locking tongue 12 of the self-locking mechanism 10, so that a good locking effect can be achieved between the first box body 20 and the second box body 30.

[0044] In one embodiment of the self-locking mechanism, the lock tongue 12 includes a head portion 121, a tail portion 122 and a connecting portion 123 connecting the head portion 121 and the tail portion 122 together; the lock seat 11 is provided with a mounting hole 111 penetrating along a first direction; the connecting portion 123 is inserted into the mounting hole 111; the head portion 121 and the tail portion 122 are respectively located on both sides of the mounting hole 111; the head portion 121 has a protruding step surface 1211 at the junction with the connecting portion 123; the elastic member 13 is a spring, and the spring is sleeved on the outside of the connecting portion 123, one end of the spring is against the first step surface 1211, and the other end is against the lock seat 11; the tail portion 122 is provided with the inclined surface connected to the control portion 14.

[0045] In this embodiment, the head portion 121 is located at the front end of the lock tongue 12. When the lock tongue 12 is extended, at least part of the head portion 121 is inserted into the lock hole 31 of the second box body 30. When the lock tongue 12 is retracted, the head portion 121 completely leaves the lock hole 31 of the second box body 30. The terminal portion 122 is used to connect with the control portion 14, and has an inclined surface connected with the control portion 14, which is used to drive the lock tongue 12 to retract toward the rear end as a whole under the action of the control portion 14. The connecting portion 123 is inserted into the mounting hole 111, and is used to realize the fixing of the lock tongue 12 on the lock seat 11, and is used to set a spring on its circumferential outer side.

[0046] In an embodiment of the self-locking mechanism, the end portion 122 and the connecting portion 123 of the locking tongue 12 are separate structures, and the two are fixedly connected.

[0047] In this embodiment, the connecting portion 123 and the head end portion 121 may be an integral structure or a split structure. When the connecting portion 123 and the head end portion 121 are split structures, the two are fixedly connected; and when the head end portion 121 and the connecting portion 123 of the locking tongue 12 are split structures, the terminal portion 122 and the connecting portion 123 may be an integral structure.

[0048] Specifically, the fixed connection between the connecting portion 123 and the head portion 121 , or the fixed connection between the connecting portion 123 and the tail portion 122 , may be a bolt connection.

[0049] In actual implementation, it is preferred to set the connecting portion 123 and the head portion 121 as an integral structure, or to set the connecting portion 123 and the terminal portion 122 as an integral structure. In this way, the connecting portion 123 only needs to be connected once to the head portion 121 or the terminal portion 122 as another split body, without the need to connect the connecting portion 123 twice to the head portion 121 and the terminal portion 122 respectively.

[0050] In an embodiment of the self-locking mechanism, one of the control portion 14 and the lock seat 11 is provided with a slide groove along the second direction, and the other is provided with a slide rail corresponding to the slide groove.

[0051] In such Figure 2 In the structure shown, the slide groove is provided on the control part 14 , which is the slide groove 141 ; the slide rail is provided on the lock seat 11 , which is the slide rail 112 .

[0052] In this embodiment, by providing the slide groove 141 and the slide rail 112, the control part 14 can slide relative to the lock seat 11 along the length direction of the slide groove 141. In the case where the control part 14 and the lock seat 11 have such relative sliding, the lock tongue 12 can be driven to extend and retract along the first direction through the inclined surface connected to each other between the control part 14 and the lock tongue 12 during the sliding process.

[0053] In one embodiment of the self-locking mechanism, the inclined surface between the control portion 14 and the lock tongue 12 is a conical inclined surface or a truncated cone inclined surface. Figure 2 In the structure shown, the inclined surface connecting the control portion 14 and the locking tongue 12 is a truncated cone-shaped inclined surface.

[0054] In the case where the inclined surface connecting the control portion 14 and the lock tongue 12 is a truncated cone-shaped inclined surface, Figures 2 to 7As shown, when the control part 14 continues to slide relative to the lock tongue 12, the conical inclined surface on the lock tongue 12 will be out of contact with the inclined surface on the control part 14, and the plane inside the conical inclined surface of the lock tongue 12 can be against the plane outside the inclined surface on the control part 14. At this time, the lock tongue 12 is locked and fixed in this state. Even if the control part 14 is no longer pulled, the lock tongue 12 will not be reset under the elastic force of the elastic member 13.

[0055] Based on the fact that the inclined surface connecting the control part 14 and the lock tongue 12 is a conical inclined surface or a truncated cone inclined surface, in a further embodiment, the control part 14 is rotatably connected to the lock seat 11, and the rotation surface of the control part 14 relative to the lock seat 11 is perpendicular to the first direction.

[0056] In this embodiment, in a plane perpendicular to the first direction, with the lock tongue 12 as the center, the control part 14 can rotate to any direction in the radial direction, and in any direction, the control part 14 can slide relative to the lock seat 11. That is to say, when the lock tongue 12 is controlled to extend and retract along the first direction, the sliding direction of the control part 14 relative to the lock seat 11 can be any direction without restriction. Compared with the aforementioned embodiment in which the slide groove and the slide rail are provided, the sliding direction of the control part 14 relative to the lock seat 11 is specific, while in this embodiment, there is no such restriction, and the sliding direction of the control part 14 relative to the lock seat 11 is arbitrary.

[0057] In an embodiment of the self-locking mechanism, the control portion 14 is further provided with a handle portion 142 .

[0058] In this embodiment, when the handle portion 142 is provided, the control portion 14 can be pulled by holding the handle portion 142 to make it slide relative to the lock seat 11, and further make the lock tongue 12 extend and retract along the first direction, thereby making the control of locking or unlocking the self-locking mechanism 10 more convenient and labor-saving.

[0059] In summary, in the self-locking mechanism of the above embodiment of the present invention, the control part 14 for controlling the movement of the lock tongue 12 slides along the second direction. When the control part 14 moves along the second direction, the contact part of the control part 14 that is in contact with the lock tongue 12 acts on the lock tongue 12, so that the lock tongue 12 retracts from the lock hole in the first direction. When the control part 14 does not apply force to the lock tongue 12, the lock tongue 12 extends into the lock hole under the action of the elastic member 13. In the above self-locking mechanism, the extension direction of the lock tongue 12 and the sliding direction of the control part 14 are in different directions, so that the self-locking mechanism 10 is conveniently arranged on the side of the box assembly. Specifically, for the first box body 20 and the second box body 30 in the box body assembly, when the self-locking mechanism 10 is set on the side of the first box body 20, the locking tongue 12 of the self-locking mechanism 10 can be inserted into the locking hole 31 set on the side of the second box body 30. For the second box body 30, it is fixed in multiple directions by the locking tongue 12 of the self-locking mechanism 10, so that a good locking effect can be achieved between the first box body 20 and the second box body 30.

[0060] In one embodiment of the box assembly of the present invention, Figure 3 to Figure 7 As shown, the box assembly includes at least one group of boxes, each group of boxes includes a first box 20 and a second box 30 stacked together, the self-locking mechanism 10 described in the above embodiment is arranged on the side of the first box 20, and the second box 30 is provided with a lock hole 31 corresponding to the lock tongue 12 of the self-locking mechanism 10.

[0061] The box assembly of the present invention includes the self-locking mechanism 10 described in the above embodiment, and of course has the same beneficial effects as the above self-locking mechanism 10, which will not be described in detail.

[0062] In one embodiment of the box assembly, one of the first box 20 and the second box 30 is a battery box, and the other is a battery box or an electric control box.

[0063] In other words, in this embodiment, the self-locking mechanism 10 realizes locking and unlocking between two battery boxes, or between one battery box and one electric control box.

[0064] In this embodiment, the first box body 20 and the second box body 30 of each group of boxes can be stacked in the vertical direction, and of course can also be stacked in the horizontal direction or other directions, and the present invention is not limited to this.

[0065] In this embodiment, the box assembly may only have one electric control box and one battery box, in which case the electric control box and the battery box form a group of boxes. The box assembly may also include one electric control box and multiple battery boxes, in which case the box assembly may form multiple groups of boxes. For example, in the case where the box assembly includes one electric control box and two battery boxes, two groups of boxes may be formed; specifically, in the case where the electric control box and the battery box are stacked in the vertical direction and the electric control box is located at the top, the electric control box located at the top and the battery box located in the middle may form a first group of boxes, and the battery box located in the middle and the battery box located at the bottom may form a second group of boxes; for the first group of boxes, the electric control box may be the second box 30, on which a lock hole 31 is provided, and the battery box may be the first box 20, on which a self-locking mechanism 10 is provided; and for the second group of boxes, the battery box located in the middle may be the second box 30, on which a lock hole 31 is provided, and the battery box located at the bottom may be the first box 20, on which a self-locking mechanism 10 is provided.

[0066] In an embodiment of the box assembly, the number of self-locking mechanisms 10 disposed on the first box 20 is multiple, and the multiple self-locking mechanisms 10 are disposed on at least two side surfaces of the first box 20 .

[0067] In this embodiment, a plurality of self-locking mechanisms 10 are provided on the first box body 20 of each group of boxes, which can provide a better locking effect for the second box body 30; moreover, when the self-locking mechanisms 10 are provided on at least two sides of the first box body 20, the second box body 30 can be restricted and locked in more directions, thereby further enhancing the locking effect of the second box body 30 and minimizing the probability of the second box body 30 being separated from or falling off the first box body 20 in an accident.

[0068] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0069] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A self-locking mechanism, It is characterized in that The self-locking mechanism comprises a lock seat, a lock tongue, an elastic member and a control part; The lock tongue and the control part are both arranged on the lock seat, and the lock tongue is movable relative to the lock seat along a first direction, and the control part is slidable relative to the lock seat along a second direction; The control part is connected to the lock tongue, the contact part of the control part connected to the lock tongue is an inclined surface and / or the contact part of the lock tongue connected to the control part is an inclined surface, and the inclined surface is inclined compared to the first direction; when the control part slides along the second direction, the contact part of the control part connected to the lock tongue acts on the lock tongue, so that the lock tongue moves along the first direction into the lock hole; The elastic member is connected between the lock tongue and the lock seat, and is used to act on the lock tongue with its own elastic force, so that the lock tongue tends to return to its original position and retracts from the lock hole; The locking tongue comprises a head end portion, a tail end portion and a connecting portion connecting the head end portion and the tail end portion together; The lock seat is provided with a mounting hole penetrating along a first direction; the connecting portion is inserted into the mounting hole; the head end portion and the tail end portion are respectively located on two sides of the mounting hole; The junction between the head end and the connecting portion has a protruding step surface; the elastic member is a spring, and the spring is sleeved on the outside of the connecting portion, one end of the spring abuts against the step surface, and the other end abuts against the lock seat; The terminal portion is provided with an inclined surface connected to the control portion; The inclined surface connecting the control portion and the locking tongue is a conical inclined surface or a truncated cone inclined surface.

2. The self-locking mechanism according to claim 1, It is characterized in that The end portion and the connecting portion of the locking tongue are separate structures, and the two are fixedly connected; and / or The head end portion and the connecting portion of the locking tongue are separate structures, and the two are fixedly connected.

3. The self-locking mechanism according to claim 1, It is characterized in that A slide groove along the second direction is arranged on one of the control part and the lock seat, and a slide rail corresponding to the slide groove is arranged on the other one.

4. The self-locking mechanism according to claim 1, It is characterized in that The control part is rotatably connected to the lock seat, and a rotation plane of the control part relative to the lock seat is perpendicular to the first direction.

5. The self-locking mechanism according to claim 1, It is characterized in that The control part is also provided with a handle part.

6. A box assembly, It is characterized in that The box assembly includes at least one group of boxes, each group of boxes includes a first box and a second box that are stacked, the side of the first box is provided with a self-locking mechanism as described in any one of claims 1 to 5, and the second box is provided with a lock hole corresponding to the lock tongue of the self-locking mechanism.

7. The box assembly according to claim 6, It is characterized in that One of the first box and the second box is a battery box, and the other is a battery box or an electric control box.

8. The box assembly according to claim 6, It is characterized in that There are multiple self-locking mechanisms arranged on the first box body, and the multiple self-locking mechanisms are arranged on at least two side surfaces of the first box body.

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