CN213660687U

CN213660687U - Plug assembly, plug structure and electric automobile

Info

Publication number: CN213660687U
Application number: CN202022815306.6U
Authority: CN
Inventors: 李棒; 徐文军; 胡生; 肖飞; 张强; 杜青林
Original assignee: Shenzhen Woer Heat Shrinkable Material Co Ltd; Shenzhen Woer New Energy Electric Technology Co Ltd
Current assignee: Shenzhen Woer New Energy Electric Technology Co Ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-07-09
Anticipated expiration: 2030-11-27

Abstract

The utility model discloses a plug assembly, a plug structure and an electric automobile, wherein the plug assembly comprises a plug shell and a high-voltage interlocking plug, and the plug shell is provided with a mounting groove; the high-voltage interlocking plug comprises a base and interlocking signal pins, wherein the base is detachably limited in the mounting groove, one end of each interlocking signal pin is fixed on the base, and the other end of each interlocking signal pin faces to the notch of the mounting groove. The utility model discloses technical scheme's plug subassembly can reduce the probability that high-pressure interlocking signal is disconnected momentarily, and can solve the difficult problem of reprocessing.

Description

Plug assembly, plug structure and electric automobile

Technical Field

The utility model relates to an electric automobile connector technical field, in particular to plug subassembly, plug structure and electric automobile.

Background

Under the current situation of rapid development of new energy vehicles, the electric connector serves as a circuit connection unit, so that the circuit can be conveniently and quickly mounted and dismounted, and the electric connector is widely applied to the fields of power supply systems, high-voltage distribution boxes and the like. From the viewpoint of system functional safety, in order to reduce the risk occurrence probability, a High Voltage Inter-lock (HVIL) is used in circuit design as a safety measure for the safety of the High Voltage system of the electric vehicle.

At present, the high-voltage interlocking terminal of the large-current plug utilizes the metal elastic sheet to realize interlocking connection, and although space can be saved, the risk of instantaneous disconnection of a high-voltage interlocking signal exists. And most plugs are assembled on the insulator of the plug by the interlocking contact pieces firstly, and then other parts are assembled, so that once the interlocking contact pieces are not assembled, the repair process is complicated, time and labor are consumed, and other parts are easily damaged in the disassembly process.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a plug subassembly aims at reducing the probability of high-pressure interlocking signal instantaneous interruption and solving the difficult problem of reprocessing.

In order to achieve the above object, the present invention provides a plug assembly comprising:

a plug housing formed with a mounting groove; and

the high-voltage interlocking plug comprises a base and interlocking signal contact pins, the base is detachably limited in the mounting groove, one end of each interlocking signal contact pin is fixed on the base, and the other end of each interlocking signal contact pin faces to the notch of the mounting groove.

In an alternative embodiment, the base and the interlocking signal pins are of an integral injection molding structure.

In an optional embodiment, one of the circumferential surface of the base and the side wall of the mounting groove is provided with a first limiting portion, and the other is provided with a second limiting portion, and the first limiting portion abuts against the second limiting portion to limit the displacement of the base in the direction perpendicular to the insertion direction.

In an optional embodiment, the base includes a body and two limiting protrusions disposed at two opposite ends of the body, a limiting step is formed on the surface of one of the limiting protrusions facing the body, the first limiting portion is the limiting step, a limiting groove is correspondingly recessed in the side wall of the mounting groove, the second limiting portion is the limiting groove, and the limiting step abuts against the peripheral wall of the limiting groove.

In an optional embodiment, one of the side wall of the mounting groove and the base is provided with a clamping piece, and the other is provided with a clamping hole; the snap-fit piece can be snapped into the snap-fit hole to limit the displacement of the high-voltage interlocking plug in the insertion direction.

In an optional embodiment, a receiving groove is concavely formed in the circumferential surface of the base, the engaging member is connected in the receiving groove, the engaging member is an elastic member, the free end of the engaging member faces the free end of the interlocking signal contact pin, and the side wall of the mounting groove is provided with the clamping hole.

In an optional embodiment, one of the bottom wall of the mounting groove and the end surface of the base, which is away from the interlocking signal socket, is provided with a positioning part, and the other is provided with a positioning hole matched with the positioning part, and the positioning part can be inserted into the positioning hole for positioning.

In an optional embodiment, the plug assembly further includes a terminal, the plug housing includes an outer shell and an insulator, which are sleeved with each other, a mounting hole is formed in the middle of the insulator, the terminal is disposed in the mounting hole, the outer shell and the insulator are disposed at an interval, and a gap between the outer shell and the insulator is matched to form the mounting groove.

The utility model also provides a plug structure, plug structure include protection component and as above arbitrary the plug component.

The utility model provides an electric automobile again, include automobile body and locate automobile body's plug structure, the plug structure be as above plug structure.

In the technical scheme of the utility model, the plug assembly comprises a plug shell and a high-voltage interlocking plug, a mounting groove is formed on the plug shell, the high-voltage interlocking plug comprises a base and an interlocking signal contact pin, and the base and the interlocking signal contact pin are fixed and then are mounted in the mounting groove, so that on one hand, the interlocking signal contact pin is arranged to enable the interlocking signal contact pin to be in surface contact with the interlocking jack of the socket, the connection is reliable, and the contact resistance is lower; on the other hand, the interlocking signal contact pin is assembled with the base and then assembled with the plug shell, and the high-voltage interlocking plug can be assembled no matter in the processes before and after the assembly of the plug assembly, so that the problem that the interlocking signal contact pin is difficult to repair after being not assembled is solved. Meanwhile, an assembly gap can exist in the high-voltage interlocking plug due to the assembly of the base and the installation groove, when vibration occurs in the driving process of an automobile, the high-voltage interlocking plug can be synchronously finely adjusted along with the micro motion between the plug assembly and the socket assembly, and the situation that a high-voltage interlocking signal is momentarily broken is guaranteed not to occur.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of a plug structure of the present invention;

FIG. 2 is a front view of the plug structure shown in FIG. 1;

FIG. 3 is a partial exploded view of the plug structure shown in FIG. 1;

FIG. 4 is a schematic view of a plug housing of the plug structure of FIG. 1;

FIG. 5 is a cross-sectional view of the plug housing of FIG. 4;

FIG. 6 is a schematic structural view of a high voltage interlock plug of the plug configuration of FIG. 1;

FIG. 7 is a schematic view of the high voltage interlock plug of FIG. 6 from another perspective;

figure 8 is a partial cross-sectional view of a high voltage interlock plug of the plug assembly of figure 6.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a plug assembly 100 is applied to electric automobile for pass through lead wire or cable with electric automobile's high-pressure part and be connected with plug assembly 100, thereby make things convenient for electric automobile to pass through plug assembly 100 and high-pressure part or fill equipment such as electric pile and be connected, thereby realize the transmission of signal. The plug assembly 100 is a large-current loop and a high-voltage loop after being connected with a corresponding socket assembly, in order to improve safety, the plug assembly 100 further comprises a high-voltage interlocking plug 30, the high-voltage interlocking plug 30 is used for being matched with a corresponding high-voltage interlocking jack, and therefore the purpose of monitoring the integrity of the high-voltage loop by using a low-voltage signal can be achieved, namely the high-voltage loop of the connection between a terminal in the plug assembly 100 and a terminal in a corresponding socket is monitored, when the high-voltage loop is automatically loosened, alarm information can be provided for a vehicle controller before high-voltage power failure, and time for taking measures of a vehicle system is reserved.

In this embodiment, plug assembly 100 is installed in electric automobile or fills electric pile for with electric automobile's high-voltage component or fill electric pile's line connection, so, can dock electric automobile or fill electric pile's high-voltage socket subassembly, realize the connection in high-pressure return circuit, realize high-pressure interlocking signal's intercommunication simultaneously.

Referring to fig. 1 to 4, in an embodiment of the present invention, the plug assembly 100 includes a plug housing 10 and a high-voltage interlock plug 30, wherein the plug housing 10 is formed with a mounting groove 10 a;

the high-voltage interlocking plug 30 comprises a base 31 and an interlocking signal pin 33, wherein the base 31 is detachably limited in the mounting groove 10a, one end of the interlocking signal pin 33 is fixed on the base 31, and the other end of the interlocking signal pin faces to a notch of the mounting groove 10 a.

In this embodiment, the plug assembly 100 includes a plug housing 10, and a plurality of terminals are disposed inside the plug housing 10, so as to connect with a corresponding socket assembly for signal transmission. Plug housing 10's material can be metal or plastics, and structural strength is high and stability is good to the realization is to inner structure's protection, and plug housing 10 is the column setting, and mounting groove 10a sets up in the border position of plug housing 10 terminal surface, and extends towards the other end, thereby can not lead to the fact the influence to the installation of other parts.

Meanwhile, the high-voltage interlocking plug 30 includes a base 31 and an interlocking signal pin 33, the base 31 is used for providing a fixed foundation for the interlocking signal pin 33, so as to facilitate the interlocking signal pin 33 to be plugged with the jack, and here, the base 31 and the interlocking signal pin 33 may be an integral structure or a separate structure, which is not limited herein. And the base 31 can be made of plastic, is light and stable in structure, and can effectively isolate the interlocking signal pins 33 from the plug housing 10 or other parts to prevent short circuit. The shape of the base 31 needs to be matched with the opening shape of the mounting groove 10a, so that the base 31 is conveniently limited in the mounting groove 10a, taking the plug housing 10 as a cylinder shape as an example, the opening shape of the mounting groove 10a is quadrilateral, and the edge extending along the circumferential direction of the plug housing 10 is arc-shaped and is matched with the shape of the plug housing 10, so that the base 31 is in an arc-shaped plate-shaped structure. Of course, the opening shapes of the base 31 and the mounting groove 10a are not limited to the above shapes, and may be square, rectangular, polygonal, or the like, and are not limited thereto.

It can be understood that the interlocking signal pins 33 are partially exposed from the base 31, so as to facilitate plugging, and when the base 31 is installed in the installation slot 10a, the exposed portions of the interlocking signal pins 33 are also accommodated in the installation slot 10a, so that the plug housing 10 can play a certain protection role when the high-voltage interlocking plug 30 is not connected, thereby preventing accidental damage.

In the technical scheme of the utility model, the plug assembly 100 includes the plug housing 10 and the high-voltage interlocking plug 30, the mounting groove 10a is formed on the plug housing 10, the high-voltage interlocking plug 30 includes the base 31 and the interlocking signal pin 33, and the two are fixed and then installed in the mounting groove 10a, so, on one hand, the setting of the interlocking signal pin 33 makes the interlocking jack with the socket be surface contact, the connection is reliable and the contact resistance is lower; on the other hand, the interlocking signal pins 33 are assembled with the base 31 and then assembled with the plug housing 10, so that the high-voltage interlocking plug 30 can be assembled regardless of the processes before and after the assembly of the plug assembly 100, and the problem that the interlocking signal pins 33 are difficult to repair after being assembled in a missing manner is solved. Meanwhile, an assembly gap exists between the base 31 and the installation groove 10a in the high-voltage interlocking plug 30, so that the high-voltage interlocking plug can be synchronously finely adjusted along with the micro motion between the plug assembly 100 and the socket assembly when vibration occurs in the driving process of an automobile, and the high-voltage interlocking signal is ensured not to be momentarily broken.

In an alternative embodiment, the base 31 and the interlocking signal pins 33 are formed as a single injection molded structure.

In this embodiment, in order to facilitate the processing, the high-voltage interlocking plug 30 is arranged in an integrated injection molding structure, that is, the interlocking signal pin 33 is put into the mold, and then the injection molding base 31 is used, so that the modular high-voltage interlocking plug 30 is formed, the structural strength of the high-voltage interlocking plug can be improved, and the disassembly and assembly efficiency can be improved. Meanwhile, the interlocking signal pin 33 is U-shaped, and the bent end is inserted into the mold, so that the inserting position and the firmness and reliability of the interlocking signal pin 33 are guaranteed.

In an alternative embodiment, one of the peripheral surface of the base 31 and the side wall of the mounting groove 10a is provided with a first limiting portion, and the other is provided with a second limiting portion, and the first limiting portion abuts against the second limiting portion to limit the displacement of the base 31 in the direction perpendicular to the insertion direction.

In this embodiment, in order to make the base 31 and the mounting groove 10a cooperate more stably, a first spacing portion is provided on the peripheral surface of the base 31 and the side wall of the mounting groove 10a, and the other is provided with a second spacing portion, and after the base 31 is inserted into the mounting groove 10a from the notch of the mounting groove 10a, the first spacing portion abuts against the second spacing portion, so that the displacement of the base 31 in the direction perpendicular to the insertion direction is realized, namely, the displacement restriction in the circumferential direction and the radial direction of the plug housing 10 is followed, and the mounting stability is improved.

Referring to fig. 4 and fig. 6, in an embodiment, the base 31 includes a body 311 and two limiting protrusions 313 disposed at two opposite ends of the body 311, a surface of the limiting protrusion 313 opposite to the body 311 forms a limiting step 315, the first limiting portion is the limiting step 315, a limiting groove 111 is correspondingly recessed in a side wall of the mounting groove 10a, the second limiting portion is the limiting groove 111, and the limiting step 315 abuts against a peripheral wall of the limiting groove 111.

In this embodiment, the base 31 is divided into a body 311 and two limiting protrusions 313, the body 311 is in an arc-shaped plate shape, the two limiting protrusions 313 are disposed on two opposite side surfaces of the body 311 along an arc-shaped extending direction, the extending length of the limiting protrusions 313 is the same as the extending length of the body 311, and the thickness of the limiting protrusions 313 is smaller than the thickness of the body 311, so that two opposite surfaces of the limiting protrusions 313 and the body 311 form a limiting step 315, and thus, the first limiting portion is set as the limiting step 315. Correspondingly, the side wall of the mounting groove 10a is correspondingly recessed to form a limiting groove 111, the limiting groove 111 is a second limiting part, and one side wall of the limiting groove 111 and the side wall of the adjacent mounting groove 10a are abutted against the limiting step 315, so that the mounting stability is enhanced.

Of course, in other embodiments, the first position-limiting portion may also be the position-limiting groove 111, and the second position-limiting portion is the position-limiting protrusion 313; or, the limiting protrusion 313 is arranged in the middle of the side surface of the body 311, so as to form two limiting steps 315, further enhancing the structural stability; or, the two limiting protrusions 313 are disposed on two opposite arc-shaped side wall surfaces of the body 311, and the arc-shaped side wall of the mounting groove 10a is provided with a corresponding limiting groove 111.

In an alternative embodiment, one of the side wall of the mounting groove 10a and the base 31 is provided with a clamping piece 317, and the other is provided with a clamping hole 113; the snap-in piece 317 can snap into the snap-in hole 113 to limit the displacement of the high-voltage interlock plug 30 in the plug-in direction.

In this embodiment, in order to facilitate the insertion of the base 31, a certain gap is formed between the base 31 and the inner wall of the mounting groove 10a, in order to prevent the base 31 from being separated from the mounting groove 10a, the side wall of the mounting groove 10a is further provided with a clamping connection relation with the base 31, that is, one of the two is provided with a clamping member 317, for example, a clamping protrusion, a buckle or a pin hole, and the other is provided with a clamping hole 113, when the clamping member 317 is matched with the clamping hole 113, the displacement of the base 31 in the insertion direction can be limited, and thus the stable installation of the high-voltage interlocking plug 30 is realized. Of course, when the engaging member 317 is a pin hole, a pin may be inserted into the pin hole and the engaging hole 113 to fix the same.

Referring to fig. 3 and fig. 5 to fig. 8, in an alternative embodiment, an accommodating groove 3111 is concavely disposed on a circumferential surface of the base 31, the engaging member 317 is connected in the accommodating groove 3111, the engaging member 317 is an elastic member, a free end of the engaging member 317 faces a free end of the interlock signal pin 33, and the side wall of the mounting groove 10a is opened with the locking hole 113.

In this embodiment, in order to further improve the installation efficiency, the engaging member 317 is an elastic buckle, which can be elastically deformed when being pressed and can be restored after the pressure is released. In order to provide a deformation space for the engaging member 317, a receiving groove 3111 is concavely formed on the peripheral surface of the base 31, one end of the engaging member 317 is connected to the sidewall of the receiving groove 3111, and the other free end faces the free end of the interlocking signal pin 33, so that when the base 31 is inserted into the mounting groove 10a, the free end of the engaging member 317 is pressed by the sidewall of the mounting groove 10a to be closely attached to the bottom wall of the receiving groove 3111, and after the base 31 is inserted into the position of the engaging hole 113, the force pressing the free end of the engaging member 317 disappears, and the engaging member 317 rebounds to abut against the periphery of the engaging hole 113, thereby effectively preventing the base 31 from being separated from the mounting.

Meanwhile, in order to increase the engaging area, the engaging piece 317 has a substantially L-shaped structure, so that the area of the end surface of the free end of the engaging piece 317 is increased, and the stability of the engagement is improved. In addition, the surface of the free end of the engaging member 317 facing the side wall of the mounting groove 10a is set as a guiding slope, so that the friction between the engaging member 317 and the side wall of the mounting groove 10a can be reduced during the insertion of the base 31, so that the assembly of the high-voltage interlock plug 30 is more labor-saving and faster.

Referring to fig. 5, in an embodiment, one of the bottom wall of the mounting groove 10a and the end surface of the base 31 facing away from the interlock signal pin 33 is provided with a positioning element 115, and the other is provided with a positioning hole (not shown) matched with the positioning element 115, and the positioning element 115 can be inserted into the positioning hole for positioning.

In this embodiment, since there is an assembly gap between the base 31 and the peripheral wall of the mounting groove 10a, in order to position and mount the base 31, the positioning member 115 is disposed on the bottom wall of the mounting groove 10a, and a positioning hole is formed on the end surface of the base 31 away from the interlock signal pin 33, and the positioning member 115 is inserted into the positioning hole for positioning, so that the shape of the positioning member 115 matches the positioning hole, and here, the cross-sectional shape of the positioning member 115 is not limited to be circular, triangular, square, polygonal, or the like. Of course, in other embodiments, a positioning hole may be formed in the bottom wall of the mounting groove 10a, and the positioning element 115 may be disposed on the end surface of the base 31.

It can be understood that the plug assembly 100 further includes a terminal (not shown), in an embodiment, the plug assembly 100 further includes a terminal, the plug housing 10 includes an outer shell 11 and an insulator 13, which are sleeved with each other, a mounting hole 131 is opened in a middle portion of the insulator 13, the terminal is disposed in the mounting hole 131, the outer shell 11 and the insulator 13 are spaced apart from each other, and a gap fit therebetween forms the mounting groove 10 a.

In this embodiment, in order to effectively isolate the terminals from the interlocking signal pins 33, the plug housing 10 includes an outer shell 11 and an insulator 13 disposed inside the outer shell 11, a mounting hole 131 is formed in a middle portion of the insulator 13, and a plurality of terminals are disposed in the mounting hole 131 at intervals. The housing 11 is sleeved on the insulator 13, and the housing 11 and the insulator 13 are arranged at intervals, and a gap between the housing 11 and the insulator 13 forms a mounting groove 10a for mounting the high-voltage interlocking plug 30. Wherein, the shell 11 is provided with a first groove 117 in the inner side surface thereof in a concave manner towards the direction deviating from the center, the outer peripheral surface of the insulator 13 is provided with a second groove 133 in a concave manner towards the center, the first groove 117 and the second groove 133 are butted to form a mounting groove 10a, a positioning member 115 is arranged on the bottom wall of the first groove 117, a clamping hole 113 is formed on the side wall of the first groove 117, and the clamping hole 113 can directly penetrate through the side wall of the first groove 117. And when the high-voltage interlocking plug 30 is installed in the installation groove 10a, the end of the interlocking signal pin 33 protrudes out of the end of the terminal, so that when the plug assembly 100 is connected, the interlocking signal pin 33 is connected with the terminal before, and when the connection is disconnected, the terminal is disconnected later, and therefore the complete monitoring of a high-voltage loop can be realized.

Specifically, the insulator 13 may be formed by integral injection molding, which is advantageous in reducing the overall weight of the plug assembly 100. And be provided with at the middle part of mounting hole 131 and prevent finger structure, a plurality of terminal interval rings are located and are prevented finger structure's periphery, on the one hand keep apart a plurality of terminals, and on the other hand also can effectively prevent that the user from pointing the mistake and inserting and cause the injury, improve the security.

Referring to fig. 1 to fig. 3, the present invention further provides a plug structure 1000, where the plug structure 1000 includes a protection component 200 and the plug component 100 as described above.

In this embodiment, the plug structure 1000 includes, in addition to the plug assembly 100, a protection assembly 200 for protecting the plug assembly 100, and it can be understood that the opposite two ends of the plug assembly 100 are generally respectively configured as a plug end and a connection end, the plug end is used for butting against a socket, and the connection end is used for connecting and fixing with a wire or a cable. Here, the protection component 200 is disposed at the connection end of the plug component 100, and is used for protecting the wires or cables at the connection end, and placing an external force to squeeze or impact the cables. Specifically, the protection assembly 200 includes a socket section 201 and a switching section 203, which are disposed at a vertical included angle and have a through-wire cavity for allowing a wire or a cable to pass through, so as to provide a handheld position for a user while protecting, thereby facilitating connection of a high-voltage circuit.

The utility model provides an electric automobile (not shown in the drawing) again, this electric automobile include automobile body and locate automobile body's plug structure 1000, and the concrete structure of this plug structure 1000 refers to aforementioned embodiment, because this electric automobile has adopted the whole technical scheme of aforementioned all embodiments, consequently has all beneficial effects that the technical scheme of aforementioned embodiment brought at least, and the repeated description is no longer given here.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. A plug assembly, comprising:

a plug housing formed with a mounting groove; and

2. The plug assembly of claim 1 wherein said base and said interlocking signal pins are of a unitary injection molded construction.

3. The plug assembly according to claim 1 or 2, wherein one of the peripheral surface of the base and the side wall of the mounting groove is provided with a first limiting portion, and the other one is provided with a second limiting portion, and the first limiting portion abuts against the second limiting portion to limit the displacement of the base in the direction perpendicular to the insertion direction.

4. The plug assembly of claim 3, wherein the base comprises a body and two limiting protrusions disposed at opposite ends of the body, a surface of the limiting protrusion facing the body forms a limiting step, the first limiting portion is the limiting step, a limiting groove is correspondingly recessed in a side wall of the mounting groove, the second limiting portion is the limiting groove, and the limiting step abuts against a peripheral wall of the limiting groove.

5. The plug assembly of claim 3, wherein one of the side wall of the mounting groove and the base is provided with a snap member, and the other is provided with a snap hole; the snap-fit piece can be snapped into the snap-fit hole to limit the displacement of the high-voltage interlocking plug in the insertion direction.

6. The plug assembly of claim 5, wherein a receiving groove is concavely formed on a peripheral surface of the base, the engaging member is connected to the receiving groove, the engaging member is an elastic member, a free end of the engaging member faces a free end of the interlocking signal pin, and the side wall of the mounting groove is provided with the engaging hole.

7. The plug assembly according to claim 1 or 2, wherein one of the bottom wall of the mounting groove and the end surface of the base facing away from the interlocking signal pin is provided with a positioning member, and the other is provided with a positioning hole matched with the positioning member, and the positioning member can be inserted into the positioning hole for positioning.

8. The plug assembly of claim 1 or 2, wherein the plug assembly further comprises a terminal, the plug housing comprises a shell and an insulator which are sleeved with each other, a mounting hole is formed in the middle of the insulator, the terminal is arranged in the mounting hole, the shell and the insulator are arranged at a distance, and a clearance fit between the shell and the insulator forms the mounting groove.

9. A plug structure, characterized in that it comprises a protective assembly and a plug assembly according to any one of claims 1 to 8.

10. An electric vehicle, characterized by comprising a vehicle body and a plug structure provided in the vehicle body, wherein the plug structure is the plug structure of claim 9.