Locking device and electric vehicle

Abstract

A locking device (figure 1, 1000) comprising a housing (figure 1, 100) having a front end wall (figure 1, 110), a rear end wall (figure 10, 120), and a side wall (figure 10, 130); a driving assembly 2

Description

Cross-Reference To Related Application This application claims the priority of Chinese Application No. 202510024918.8 filed on January 6,2025 and entitled “Locking Device and Electric Vehicle”, the whole disclosure of which are incorporated herein by reference. Field of the Disclosure The present application relates to the field of mechanical electronics, and more particularly to a locking device and an electric vehicle. Description of the Related Art A locking device is typically used in an electric vehicle to lock a charging gun that is charging the electric vehicle. After the locking device locks the charging gun, a feedback signal is sent to a controller through a feedback loop in the locking device to notify the controller that the charging gun has been locked. A micro switch is usually used in the feedback loop to turn on and off the feedback loop. However, the micro switch has a large volume and occupies a large internal space in the locking device, which increases the design difficulty of the locking device. And the micro switch has a limited service life, resulting in frequent replacement of the micro switch and increasing the maintenance cost. In order to solve these problems, it is proposed in the industry to use a printed circuit board (PCB) to replace the micro switch. However, the printed circuit board has a high cost, and it is difficult to assemble the printed circuit board into the locking device, which makes it difficult for the printed circuit board to meet the practical requirements. Therefore, there is a need to provide a locking device comprising a switch structure that is easy to assemble, low in cost, simple in structure, and durable. Summary Embodiments of the present application are directed to solving at least one aspect of the problems set forth above. According to one aspect of the present application, there is provided a locking device, characterized by comprising: a housing having a front end wall, a rear end wall, and a side wall extending between the front end wall and the rear end wall; a driving assembly disposed within the housing; a locking rod configured to extend from the front end wall out of the housing under a drive of the driving assembly to achieve a locking function; a first terminal having a first front end fixed near the front end wall, a first rear end fixed on the rear end wall, and a first body extending between the first front end and the first rear end and fixed on the side wall; a second terminal spaced from the first terminal, and having a second front end fixed near the front end wall, a second rear end fixed on the rear end wall, and a second body extending between the second front end and the second rear end and fixed on the side wall; and a switch configured to move, under the drive of the driving assembly, to a conductive position in which the switch simultaneously contacts with the first front end and the second front end when the locking function is achieved. According to one aspect of the present application, the first front end is provided with a first arm extending from the first body to extend in a plane perpendicular to the side wall; and the second front end is provided with a second arm extending from the second body to be coplanar with the first arm. According to one aspect of the present application, the first arm comprises a first front arm extending from the first body perpendicular to the side wall and close to the front end wall, a first rear arm extending from the first body perpendicular to the side wall and away from the front end wall, and a first contact arm connected perpendicularly with and between the first front arm and the first rear arm; and the second arm comprises a second connecting arm extending from the second body and bent into an arc shape in a direction away from the driving assembly, and a second contact arm extending from the second connecting arm parallel to the first contact arm toward the first front arm and coplanar with the first arm. According to one aspect of the present application, the second contact arm is located between the first front arm and the first rear arm, close to the first front arm and away from the first rear arm, and a length of the second contact arm is less than that of the first contact arm. According to one aspect of the present application, the housing is provided with a fixture protruding from the side wall, and the fixture is provided on a bottom surface thereof with: a first bottom groove configured to be matched with the first arm so as to fix the first arm to the fixture; and a second bottom groove configured to be matched with the second arm so as to fix the second arm to the fixture. According to one aspect of the present application, the switch comprises: a switch body constructed as a plate shape, and having a front side facing toward the front end wall and a rear side facing toward the rear end wall; and a first elastic arm and a second elastic arm, which respectively extend obliquely upward from the front side to the rear side toward the bottom surface of the fixture, so that the first elastic arm moves against the first contact arm and the second elastic arm moves against the bottom surface when the switch moves, the switch is configured such that the first elastic arm contacts with the first contact arm and the second elastic arm contacts with the second contact arm when the switch moves to the conductive position. According to one aspect of the present application, the driving assembly comprises: a motor provided with a rotatable threaded rod; a gear set meshed with the threaded rod and driven by the threaded rod to rotate; and a carrier comprising: a first carrying portion extending in a longitudinal direction and provided with meshing teeth to be meshed with the gear set to be driven to move; and a second carrying portion extending upward from the first carrying portion in a vertical direction, wherein the locking rod is fixed in the longitudinal direction on a front surface of the second carrying portion facing toward the front end wall, and the switch is fixed on a top end of the second carrying portion facing toward a bottom surface of the fixture, so that the front surface of the second carrying portion abuts against the front end wall when the switch moves to the conductive position. According to one aspect of the present application, the top end of the second carrying portion is provided with: an end surface; a first limiting wall, a second limiting wall, and a third limiting wall that enclose a “LI” shape or U shape along a circumferential direction of the end surface, wherein the first limiting wall and the second limiting wall are opposite to each other, and the third limiting wall is connected between the first limiting wall and the second limiting wall; a first clamping portion extending from the first limiting wall and spaced from the end surface; a second clamping portion opposite to the first clamping portion, extending from the second limiting wall and spaced from the end surface; a recess provided on the end surface and located between the first clamping portion and the second clamping portion; and a protrusion located on the end surface, extending from the third limiting wall and aligned with the recess. According to one aspect of the present application, the switch body is provided with: a stopper extending obliquely downward from the switch body to abut against into the recess; and an opening located on the rear side of the switch body to be in a snap-fit connection the protrusion, wherein two side edges of the switch body are respectively clamped between the first clamping portion and the end surface and between the second clamping portion and the end surface. According to one aspect of the present application, the first rear end comprises a first transverse bending portion bent from the first body in a transverse direction on the rear end wall, a first vertical bending portion bent downward from the first transverse bending portion in a vertical direction on the rear end wall, and a first longitudinal bending portion bent from the first vertical bending portion toward an outside of the housing in a longitudinal direction; and the second rear end comprises a second transverse bending portion bent from the second body in the transverse direction on the rear end wall, and a second longitudinal bending portion bent from the second transverse bending portion toward the outside of the housing in the longitudinal direction 1 to be coplanar with the first longitudinal bending portion. According to one aspect of the present application, the side wall is provided with: a first side groove configured to match with the first body in terms of shape, so as to fix the first body to the side wall; and a second side groove configured to match with the second body in terms of shape, so as to fix the second body to the side wall. According to one aspect of the present application, the first side groove is provided therein with a plurality of first tenons distributed along a direction in which the first side groove extends, and the first body is provided therein with a plurality of first through holes distributed along a direction in which the first body extends and matched with the plurality of first tenons in terms of shape, so as to fix the first body into the first side groove; and the second side groove is provided therein with a plurality of second tenons distributed along a direction in which the second side groove extends, and the second body is provided therein with a plurality of second through holes distributed along a direction in which the second body extends and matched with the plurality of second tenons in terms of shape, so as to fix the second body into the second side groove. According to one aspect of the present application, the second body comprises: a front end section comprising one end at which the second front end is disposed; a rear end section comprising one end at which the second rear end is disposed; and a resistor connected between the other end of the front end section and the other end of the rear end section. According to one aspect of the present application, the front end section is provided at the other end thereof with two clamping fingers, so as to clamp a wire extending from one side of the resistor; and the rear end section is provided at the other end thereof with another two clamping fingers, so as to clamp a wire extending from the other side of the resistor. According to another aspect of the present application, there is provided an electric vehicle comprising the locking device according to any one of the above aspects. Brief Description of the Drawings Features of the present application will become more apparent from the detailed description set forth below when taken in conjunction with the drawings, wherein similar reference numbers always indicate corresponding elements. In the drawings, similar reference numbers generally indicate identical, functionally similar, and / or structurally similar elements. Unless otherwise stated, the figures provided throughout the present application should not be interpreted as drawings drawn to scale. FIG. 1 is a perspective view of a locking device according to an embodiment of the present application; FIG. 2 is a perspective view of the locking device shown in FIG. 1 with a cover removed; FIG. 3 is a perspective view of the locking device shown in FIG. 2 with a carrier removed, showing a switch in a conductive position; FIG. 4 is a perspective view of the locking device shown in FIG. 3 with some gears of a gear set removed, showing the switch moved away from the conductive position; FIG. 5 is a perspective view only showing the carrier provided with the switch installed in the locking device shown in FIG. 1; FIG. 6 is a perspective view of the carrier shown in FIG. 5 with the switch removed, showing a top end of a second carrying portion; FIG. 7 is a perspective view of an individual switch shown in FIG. 5; FIG. 8 is a perspective view only showing a combination of the carrier, a first terminal and a second terminal installed in the locking device shown in FIG. 1; FIG. 9 is a perspective view showing a combination of the first terminal and a second terminal according to another embodiment of the present application; FIG. 10 is a perspective view of the locking device shown in FIG. 2 with a driving assembly removed, showing a rear end wall; and FIG. 11 is a perspective view of an individual housing of the locking device shown in FIG. 1, showing a first bottom groove, a second bottom groove and a first side groove. Detailed Description of the Embodiments In order to make the objectives, technical solutions, and advantages of the present application clearer, the following further describes the present application in detail with reference to specific embodiments and the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present application. However, it may be evident that one or more embodiments may be practiced without these specific details. In addition, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present application. The terminology used herein is only for the purpose of describing specific embodiments, and is not intended to be limiting of the present application. The terms “comprise”, “include” and the like used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components. When an expression such as “at least one of A, B, and C, etc.” is used, it should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, “a system having at least one of A, B, and C” should be interpreted as comprising but not being limited to a system having A alone; a system having B alone; a system having C alone; a system having A and B; a system having A and C; a system having B and C; and / or a system having A, B, and C). Referring to FIGS. 1 to 11, the present application discloses a locking device 1000 and an electric vehicle (not shown) comprising the locking device 1000. The locking device 1000 comprises a housing 100, a driving assembly 210, 220, 230, 240, 250, a locking rod 300, a first terminal 410, a second terminal 420, and a switch 500. The housing 100 has a front end wall 110, a rear end wall 120, and a side wall 130 extending between the front end wall 110 and the rear end wall 120. A cover 160 covers the housing 100 (see FIG. 1). The driving assembly 210, 220, 230, 240, 250 is disposed within the housing 100. The locking rod 300 is configured to extend from the front end wall 110 out of the housing 100 under the drive of the driving assembly 210, 220, 230, 240, 250 to achieve a locking function, thereby locking a charging gun (not shown) into a charging port (not shown). The first terminal 410 has a first front end 411 fixed near the front end wall 110, a first rear end 412 fixed on the rear end wall 120, and a first body 413 extending between the first front end 411 and the first rear end 412 and fixed on the side wall 130. The second terminal 420 is spaced apart from the first terminal 410, and has a second front end 421 fixed near the front end wall 110, a second rear end 422 fixed on the rear end wall 120, and a second body 423 extending between the second front end 421 and the second rear end 422 and fixed on the side wall 130. The switch 500 is configured to move, under the drive of the driving assembly 210, 220, 230, 240, 250, to a conductive position (see FIG. 3) in which the switch 500 simultaneously contacts with the first front end 411 and the second front end 421 when the locking function is achieved, and to an open position (see FIG. 4) in which the switch 500 does not simultaneously contact with the first front end 411 and the second front end 421 when an unlocking function is achieved. In the conductive position, the switch 500 electrically connects the first front end 411 with the second front end 421, so that a feedback loop (not shown) is turned on and a feedback signal is sent to a controller (not shown) to notify the controller that the charging gun has been locked. In the open position, the switch 500 does not electrically connect the first front end 411 with the second front end 421, so that the feedback loop is turned off and the feedback signal cannot be sent to the controller. The present application simplifies a structure of the locking device 1000 by installing the switch 500, the first terminal 410 and the second terminal 420, which are all made of metal, into the housing 100 (as described in further detail below) and controlling an electrical connection between the first terminal 410 and the second terminal 420 through a movement of the switch 500. Because all of the switch 500, the first terminal 410 and the second terminal 420 are made of metal, the structures of them are simple and robust, and can effectively replace PCBs, thereby reducing the cost of the locking device 1000, facilitating the assembly of the locking device 1000, and making the locking device 1000 more durable. Referring to FIGS. 8 and 9, the first front end 411 is provided with a first arm 414 extending from the first body 413 to extend in a plane perpendicular to the side wall 130. The second front end 421 is provided with a second arm 424 extending from the second body 423 to be coplanar with the first arm 414. The first arm 414 comprises a first front arm 4141 extending from the first body 413 perpendicular to the side wall 130 and close to the front end wall 110, a first rear arm 4142 extending from the first body 413 perpendicular to the side wall 130 and away from the front end wall 110, and a first contact arm 4143 connected perpendicularly with and between the first front arm 4141 and the first rear arm 4142. The second arm 424 comprises a second connecting arm 4241 extending from the second body 423 and bent into an arc shape in a direction away from the driving assembly 210, 220, 230, 240, 250; and a second contact arm 4242 extending from the second connecting arm 4241 parallel to the first contact arm 4143 toward the first front arm 4141 and coplanar with the first arm 414 (see FIG. 9). Referring to FIG. 9, the second contact arm 4242 is located between the first front arm 4141 and the first rear arm 4142, close to the first front arm 4141 and away from the first rear arm 4142, and the length of the second contact arm 4242 is less than that of the first contact arm 4143. With continued reference to FIGS. 8 and 9, the first rear end 412 comprises a first transverse bending portion 4121 bent from the first body 413 in a transverse direction D3 on the rear end wall 120, a first vertical bending portion 4122 bent downward from the first transverse bending portion 4121 in a vertical direction D2 on the rear end wall 120, and a first longitudinal bending portion 4123 bent from the first vertical bending portion toward an outside of the housing 100 in a longitudinal direction D1. The second rear end 422 comprises a second transverse bending portion 4221 bent from the second body 423 in the transverse direction D3 on the rear end wall 120, and a second longitudinal bending portion 4222 bent from the second transverse bending portion 4221 toward the outside of the housing 100 in the longitudinal direction D1 to be coplanar with the first longitudinal bending portion 4123. The side wall 130 is provided with a first side groove (not shown) and a second side groove 132. The first side groove is configured to match with the first body 413 in terms of shape, so as to fix the first body 413 to the side wall 130. The second side groove 132 (see FIG. 11) is configured to match with the second body 423 in terms of shape, so as to fix the second body 423 to the side wall 130. Referring to FIGS. 8 to 11, the first side groove is provided therein with a plurality of first tenons 1311 distributed along a direction in which the first side groove extends, and the first body 413 is provided therein with a plurality of first through holes 4131 distributed along a direction in which the first body 413 extends and matched with the plurality of first tenons 1311 in terms of shape, so as to fix the first body 413 into the first side groove. The second side groove 132 is provided therein with a plurality of second tenons 1321 distributed along a direction in which the second side groove 132 extends, and the second body 423 is provided therein with a plurality of second through holes 4231 distributed along a direction in which the second body 423 extends and matched with the plurality of second tenons 1321 in terms of shape, so as to fix the second body 423 into the second side groove 132. The first body 413 of the first terminal 410 and the second body 423 of the second terminal 420 are respectively installed by providing the first side groove and the second side groove 132 on the side wall 130, which avoids the provision of a micro switch having a large volume in the locking device 1000. In this way, the problems related to the micro switch which occupies a large internal space within the locking device 1000 and needs to be frequently replaced are solved, which is beneficial to saving the space within the housing 100 and thus reducing the design difficulty of the locking device 1000. Referring to FIG. 9, in another embodiment according to the present application, the second body 423 comprises a front end section 4232, a rear end section 4233 and a resistor 4234. The second front end 421 is disposed at one end of the front end section 4232. The second rear end 422 is disposed at one end of the rear end section 4233. The resistor 4234 is connected between the other end of the front end section 4232 and the other end of the rear end section 4233. The front end section 4232 is provided at the other end thereof with two clamping fingers 42321, so as to clamp a wire 42341 extending from one side of the resistor 4234. The rear end section 4233 is provided at the other end thereof with another two clamping fingers 42331, so as to clamp a wire 42342 extending from the other side of the resistor 4234. The value of the resistor 4234 may be set according to requirements. However, those skilled in the art should understand that the present application is not limited thereto, and the resistor 4234 may be replaced with any suitable electronic element according to actual needs to achieve a desired electrical performance. Referring to FIGS. 2, 4, 10 and 11, the housing 100 is provided with a fixture 140 protruding from the side wall 130. The fixture 140 is provided on a bottom surface thereof with a first bottom groove 141 and a second bottom groove 142. The first bottom groove 141 is configured to be matched with the first arm 414 so as to fix the first arm 414 to the fixture 140. The second bottom groove 142 is configured to be matched with the second arm 424 so as to fix the second arm 424 to the fixture 140. This arrangement of the fixture 140 achieves a more robust electrical connection between the first arm 414 and the switch 500, and a more robust electrical connection between the second arm 424 and the switch 500. Referring to FIG. 7, the switch 500 comprises a switch body 510, a first elastic arm 520, and a second elastic arm 530. The switch body 510 is constructed as a plate shape, and has a front side 511 facing toward the front end wall 110 and a rear side 512 facing toward the rear end wall 120. The first elastic arm 520 and the second elastic arm 530 respectively extend obliquely upward from the front side 511 to the rear side 512 toward the bottom surface of the fixture 140 (see FIGS. 3 and 4), so that the first elastic arm 520 moves against the first contact arm 4143 and the second elastic arm 530 moves against the bottom surface when the switch 500 moves. The switch 500 is configured such that the first elastic arm 520 contacts the first contact arm 4143 and the second elastic arm 530 contacts the second contact arm 4242 when the switch 500 moves to the conductive position. Referring to FIGS. 2, 3 and 4, the driving assembly 210, 220, 230, 240, 250 comprises a motor 210, a gear set 220, 230, 240, and a carrier 250. The motor 210 is provided with a rotatable threaded rod 211. The gear set 220, 230, 240 is meshed with the threaded rod 211 and driven by the threaded rod 211 to rotate. The carrier 250 comprises a first carrying portion 251 extending in a longitudinal direction D1 and provided with meshing teeth 2511 to be meshed with the gear set 220, 230, 240 to be driven to move; and a second carrying portion 252 extending upward from the first carrying portion 251 in a vertical direction D2. The locking rod 300 is fixed in the longitudinal direction D1 on a front surface of the second carrying portion 252 facing toward the front end wall 110, and the switch 500 is fixed on a top end of the second carrying portion 252 facing toward a bottom surface of the fixture 140. In this way, when the switch 500 moves to the conductive position, the front surface of the second carrying portion 252 abuts against the front end wall 110, so as to prevent the carrier 250 and the switch 500 located on the carrier 250 from further moving forward. With continued reference to FIGS. 2, 3 and 4, the gear set 220, 230, 240 comprise a first gear 220 meshed with the threaded rod 211, a second gear 230 meshed with the first gear 220, and a third gear 240 meshed with the second gear 230 and the first carrying portion 251. Referring to FIGS. 5, 6 and 8, the top end of the second carrying portion 252 is provided with: an end surface 2521; a first limiting wall 2522, a second limiting wall 2523, and a third limiting wall 2524 that enclose a “LI” shape or U shape along a circumferential direction of the end surface 2521 together, wherein the first limiting wall 2522 and the second limiting wall 2523 are opposite to each other, and the third limiting wall 2524 is connected between the first limiting wall 2522 and the second limiting wall 2523; a first clamping portion 2525 extending from the first limiting wall 2522 and spaced from the end surface 2521; a second clamping portion 2526 opposite to the first clamping portion 2525, extending from the second limiting wall 2523 and spaced from the end surface 2521; a recess 2527 provided on the end surface 2521 and located between the first clamping portion 2525 and the second clamping portion 2526; and a protrusion 2528 located on the end surface 2521, extending from the third limiting wall 2524 and aligned with the recess 2527. Referring back to FIG. 7, the switch body 510 is provided with a stopper 513 and an opening 514. The stopper 513 extends obliquely downward from the switch body 510 to abut against into the recess 2527. The opening 514 is located on the rear side 512 of the switch body 510 to be in a snap-fit connection the protrusion 2528. Two side edges 515, 516 of the switch body 510 are respectively clamped between the first clamping portion 2525 and the end surface 2521 and between the second clamping portion 2526 and the end surface 2521. The switch body 510 is fixed onto the top end of the second carrying portion 252 by providing a stopper 513, an opening 514, and side edges 515 and 516. The above components included in the locking device 1000 in the present application can be assembled and installed together without welding, wiring and other processes, which greatly simplifies the structure and use of the locking device 1000 and thus is also beneficial to reduce the manufacturing cost of the locking device 1000. So far, the embodiments of the present application have been described in detail with reference to the drawings. It should be noted that the implementations not shown or described in the drawings or the text of the specification are all known to those of ordinary skill in the art and are not described in detail. In addition, the above definition of each of components is not limited to various specific structures, shapes or manners mentioned in the embodiments, and those of ordinary skill in the art may make simple changes or substitutions. Those skilled in the art will appreciate that various combinations and / or assemblies of features recited in the various embodiments and / or claims of the present application may be made, even if such combinations and / or assemblies are not explicitly recited in the present application. In particular, various combinations and / or assemblies of features described in various embodiments and / or claims of the present application may be made without departing from the spirit and teachings of the present application. All such combinations and / or assemblies fall within 5 the scope of the present application.

Claims

1. A locking device, characterized by comprising:a housing having a front end wall, a rear end wall, and a side wall extending between the front end wall and the rear end wall;a driving assembly disposed within the housing;a locking rod configured to extend from the front end wall out of the housing under a drive of the driving assembly to achieve a locking function;a first terminal having a first front end fixed near the front end wall, a first rear end fixed on the rear end wall, and a first body extending between the first front end and the first rear end and fixed on the side wall;a second terminal spaced from the first terminal, and having a second front end fixed near the front end wall, a second rear end fixed on the rear end wall, and a second body extending between the second front end and the second rear end and fixed on the side wall; anda switch configured to move, under the drive of the driving assembly, to a conductive position in which the switch simultaneously contacts with the first front end and the second front end when the locking function is achieved.

2. The locking device according to claim 1, characterized in that,the first front end is provided with a first arm extending from the first body to extend in a plane perpendicular to the side wall; andthe second front end is provided with a second arm extending from the second body to be coplanar with the first arm.

3. The locking device according to claim 2, characterized in that,the first arm comprises a first front arm extending from the first body perpendicular to the side wall and close to the front end wall, a first rear arm extending from the first body perpendicular to the side wall and away from the front end wall, and a first contact arm connected perpendicularly with and between the first front arm and the first rear arm; andthe second arm comprises a second connecting arm extending from the second body and bent into an arc shape in a direction away from the driving assembly, and a second contact arm extending from the second connecting arm parallel to the first contact arm toward the first front arm and coplanar with the first arm.

4. The locking device according to claim 3, characterized in that,the second contact arm is located between the first front arm and the first rear arm, closeto the first front arm and away from the first rear arm, and a length of the second contact arm is less than that of the first contact arm.

5. The locking device according to claim 2, 3 or 4, characterized in that,the housing is provided with a fixture protruding from the side wall, and the fixture is provided on a bottom surface thereof with:a first bottom groove configured to be matched with the first arm so as to fix the first arm to the fixture; anda second bottom groove configured to be matched with the second arm so as to fix the second arm to the fixture.

6. The locking device according to claim 5, characterized in that the switch comprises:a switch body constructed as a plate shape, and having a front side facing toward the front end wall and a rear side facing toward the rear end wall; anda first elastic arm and a second elastic arm, which respectively extend obliquely upward from the front side to the rear side toward the bottom surface of the fixture, so that the first elastic arm moves against the first contact arm and the second elastic arm moves against the bottom surface when the switch moves,the switch is configured such that the first elastic arm contacts with the first contact arm and the second elastic arm contacts with the second contact arm when the switch moves to the conductive position.

7. The locking device according to any preceding claim, characterized in that the driving assembly comprises:a motor provided with a rotatable threaded rod;a gear set meshed with the threaded rod and driven by the threaded rod to rotate; anda carrier comprising: a first carrying portion extending in a longitudinal direction and provided with meshing teeth to be meshed with the gear set to be driven to move; and a second carrying portion extending upward from the first carrying portion in a vertical direction.

8. The locking device according to claim 7, wherein the locking rod is fixed in the longitudinal direction on a front surface of the second carrying portion facing toward the front end wall, and the switch is fixed on a top end of the second carrying portion facing toward a bottom surface of the fixture, so that the front surface of the second carrying portion abuts against the front end wall when the switch moves to the conductive position.

9. The locking device according to claim 8, characterized in that the top end of the secondcarrying portion is provided with:an end surface;a first limiting wall, a second limiting wall, and a third limiting wall that enclose a “l_|” shape or U shape along a circumferential direction of the end surface, wherein the first limiting wall and the second limiting wall are opposite to each other, and the third limiting wall is connected between the first limiting wall and the second limiting wall.

10. The locking device according to claim 9, characterized in that the top end of the second carrying portion is provided with:a first clamping portion extending from the first limiting wall and spaced from the end surface;a second clamping portion opposite to the first clamping portion, extending from the second limiting wall and spaced from the end surface;a recess provided on the end surface and located between the first clamping portion and the second clamping portion; anda protrusion located on the end surface, extending from the third limiting wall and aligned with the recess.

11. The locking device according to claim 10, characterized in that the switch body is provided with:a stopper extending obliquely downward from the switch body to abut against into the recess; andan opening located on the rear side of the switch body to be in a snap-fit connection the protrusion,wherein two side edges of the switch body are respectively clamped between the first clamping portion and the end surface and between the second clamping portion and the end surface.

12. The locking device according to any preceding claim, characterized in that,the first rear end comprises a first transverse bending portion bent from the first body in a transverse direction on the rear end wall, a first vertical bending portion bent downward from the first transverse bending portion in a vertical direction on the rear end wall, and a first longitudinal bending portion bent from the first vertical bending portion toward an outside of the housing in a longitudinal direction; andthe second rear end comprises a second transverse bending portion bent from the second body in the transverse direction on the rear end wall, and a second longitudinal bending portion bent from the second transverse bending portion toward the outside of the housing inthe longitudinal direction 1 to be coplanar with the first longitudinal bending portion.

13. The locking device according to any preceding claim, characterized in that the side wall is provided with:a first side groove configured to match with the first body in terms of shape, so as to fix the first body to the side wall; anda second side groove configured to match with the second body in terms of shape, so as to fix the second body to the side wall.

14. The locking device according to claim 13, characterized in that,the first side groove is provided therein with a plurality of first tenons distributed along a direction in which the first side groove extends, and the first body is provided therein with a plurality of first through holes distributed along a direction in which the first body extends and matched with the plurality of first tenons in terms of shape, so as to fix the first body into the first side groove; andthe second side groove is provided therein with a plurality of second tenons distributed along a direction in which the second side groove extends, and the second body is provided therein with a plurality of second through holes distributed along a direction in which the second body extends and matched with the plurality of second tenons in terms of shape, so as to fix the second body into the second side groove.

15. The locking device according to any preceding claim, characterized in that the second body comprises:a front end section comprising one end at which the second front end is disposed;a rear end section comprising one end at which the second rear end is disposed; anda resistor connected between the other end of the front end section and the other end of the rear end section.

16. The locking device according to claim 15, characterized in that,the front end section is provided at the other end thereof with two clamping fingers, so as to clamp a wire extending from one side of the resistor; andthe rear end section is provided at the other end thereof with another two clamping fingers, so as to clamp a wire extending from the other side of the resistor.

17. An electric vehicle, characterized by comprising the locking device according to any one of claims 1 to 16.A

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