WO2018214239A1 - Electrical plug device and electric automobile - Google Patents

Abstract

An electrical plug device (100) and an electric automobile. The electrical plug device (100) comprises a socket component (300) and a ferrule component (200); the ferrule component (200) comprises a first ferrule (201) and a second ferrule (202) sleeved on the periphery of the first ferrule (201); and the socket component (300) comprises a first socket (301) and a second socket (302) sheathed on the periphery of the first socket (301); the first ferrule (201) is plugged and fitted to the first socket (301) in a detachable manner, and the second ferrule (202) is plugged and fitted to the second socket (302) in a detachable manner; and contact is formed between the first ferrule (201) and the first socket (301) and between the second ferrule (202) and the second socket by means of an elastic cambered surface, respectively. The effective contact area of the electrical plug device (100) increases, being able to achieve a large current load and quick plugging, facilitating quick replacement of a battery pack for an electric automobile.

Description

Electric plug device and electric car

[Technical Field]

The present invention relates to the field of connector machinery, and in particular to an electrical plug device and an electric vehicle.

 【Background technique】

The existing electric vehicle does not need to be replaced in the daily use, and it is generally necessary to overhaul the battery after using tens of thousands of kilometers or years, so the battery connection is fixedly connected, and is not suitable for frequent battery replacement. The existing electric vehicle charging can generally adopt two modes of normal charging and fast charging. Among them, the charging method takes a long charging time, which easily affects the user's normal car demand, and the rapid charging method easily affects the battery life. .

 [Summary of the Invention]

In view of this, the present invention provides an electrical plug-in device and an electric vehicle, which can realize simple and quick plug-in of the battery of the electric vehicle, facilitate quick replacement of the battery pack, and realize high current load.

In order to solve the above technical problem, an embodiment of the present invention provides an electrical plug-in device, including a socket assembly and a ferrule assembly. The socket assembly includes a first socket and a second socket disposed on a periphery of the first socket, and the ferrule assembly includes a first ferrule and a second ferrule sleeved on a periphery of the first ferrule, the first ferrule is detachably engaged with the first socket, and the second ferrule and the second socket are detachably inserted The engagement between the first ferrule and the first socket and between the second ferrule and the second socket are elastic arcuate contacts.

Wherein, the first ferrule is arranged in a column shape, the outer surface of the first ferrule forms an arc-shaped convex portion, and the first socket comprises a first elastic piece, and the first elastic piece is bent to match the shape of the curved convex portion. Further, it is in elastic contact with the curved convex portion.

Wherein, the radial width of the curved convex portion gradually decreases from the central portion to the both sides thereof.

Wherein, the second ferrule is disposed in a cylindrical shape, the inner surface of the second ferrule forms an arcuate concave portion, and the second socket includes a second elastic piece, and the second elastic piece is bent to match the shape of the curved concave portion, and further Forming elastic contact with the arcuate recess.

Wherein, the radial width of the arcuate recess gradually decreases from the central portion to the both sides thereof.

The ferrule assembly further includes a ferrule housing including a first carrier plate and a first ferrule, and the first ferrule and the second ferrule are fixed to the first carrier plate by the first ferrule.

The ferrule housing further includes a connecting plate and a spring, and the spring is elastically supported between the first carrying plate and the connecting plate.

The ferrule housing further includes a fixing sleeve which is disposed on the outer circumference of the first carrier plate and is fixed to the connecting plate.

Wherein, the ferrule assembly further comprises a joint, the bottom of the first ferrule is provided with an insertion hole, one end of the joint is inserted and fixed in the insertion hole, and the other end of the joint is away from the first carrier plate away from the first ferrule Side exposed.

Wherein, the first sleeve is injected between the first ferrule, the second ferrule and the first carrier plate by injection molding.

The first socket further includes a first cylinder, the first end of the first elastic piece is connected to the first cylinder and bent toward the inside of the first cylinder, and the second end of the first elastic piece and the inner wall of the first cylinder In contact, a region between the first end of the first elastic piece and the second end of the first elastic piece is spaced apart from the inner wall of the first cylindrical body and is bent to match the shape of the curved convex portion.

Wherein, the first cylinder and the first elastic piece are formed by a metal sheet winding forming process.

The second socket further includes a second cylinder, the first end of the second elastic piece is connected to the second cylinder and bent to the outside of the second cylinder, and the second end of the second elastic piece and the outer wall of the second cylinder In contact, a region between the first end of the second elastic piece and the second end of the second elastic piece is spaced apart from the inner wall of the second cylindrical body and is bent to match the shape of the curved concave portion.

Wherein, the second cylinder and the second elastic piece are formed by a metal sheet winding forming process.

The second cylinder is nested around the outer periphery of the first cylinder, and an insulating spacer is further disposed between the two cylinders.

The socket assembly further includes a socket housing, the socket housing includes a second carrier plate and a second sleeve, and the first barrel body, the second barrel body and the insulating spacer sleeve are fixed to the second carrier board by the second board sleeve.

Wherein, the second sleeve is injected into the first cylinder body, the second cylinder body, the insulating spacer sleeve and the second carrier plate by injection molding.

Wherein, the second carrier plate forms an accommodating cavity that is open at one end, the first socket and the second socket are fixed in the accommodating cavity, and the first ferrule and the second ferrule are inserted into the accommodating cavity through the open end of the accommodating cavity, and Cooperating with the first socket and the second socket, respectively.

In order to solve the above technical problem, another embodiment of the present invention provides an electric vehicle including a vehicle body and a battery assembly detachably fixedly mounted in the vehicle body, the battery assembly passing through the electrical plug-in device and the circuit in the vehicle body Realize electrical connections.

Wherein, the battery assembly is connected to the ferrule assembly; the socket assembly is fixed on the vehicle body and connected to an electric circuit in the vehicle body.

The utility model has the advantages that the electrical plugging device and the electric vehicle of the present invention are different from the prior art, wherein the electrical plugging device comprises a socket assembly and a ferrule assembly, the socket assembly comprises a first socket and is sleeved on the first a second socket on the periphery of the socket, the ferrule assembly includes a first ferrule and a second ferrule sleeved on a periphery of the first ferrule, wherein the first ferrule is detachably coupled with the first socket, The second ferrule is detachably engaged with the second socket, and the first ferrule and the first socket are elastic arc-faced contact between the second ferrule and the second socket, and therefore, the electricity of the invention The plugging device may be plugged and detached with the detachable plug of the ferrule to realize quick insertion and insertion, thereby realizing quick replacement of the battery pack of the electric vehicle; and the elastic arc surface contact between the socket and the ferrule can effectively increase Contact area, which is beneficial to achieve large load current.

 [Description of the Drawings]

1 is a schematic structural view of an angle of an electrical plug-in device according to an embodiment of the present invention;

Figure 2 is a schematic structural view of another angle of the electrical plug-in device of Figure 1;

Figure 3 is a cross-sectional view showing the structure of the electrical plug-in device of Figure 1;

Figure 4 is a schematic exploded view of the three-dimensional structure of the electrical plug-in device of Figure 1;

Figure 5 is a cross-sectional view of the first socket of the electrical plug-in device of Figure 4;

Figure 6 is a cross-sectional view of the second socket of the electrical plug-in device of Figure 4;

Figure 7 is a cross-sectional view showing the structure of the ferrule assembly and the socket assembly of the electrical plug-in device of Figure 1 in a plugged state.

【detailed description】

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Referring to FIG. 1-2, FIG. 1 is a schematic structural diagram of an angle of an electrical plug-in device according to an embodiment of the present invention, and FIG. 2 is a schematic structural view of another angle of the electrical plug-in device of FIG. The electrical plug-in device 100 of the present embodiment is generally applied to an electric vehicle for connecting a battery pack of an electric vehicle. As shown in FIG. 1-2, the electrical plug-in device 100 of the present embodiment includes a ferrule assembly 200 and a socket assembly 300. The ferrule assembly 200 includes a first ferrule 201 and a first sleeve disposed on the periphery of the first ferrule 201. The second ferrule 202 includes a first socket 301 and a second socket 302 sleeved on the periphery of the first socket 301. Here, the first socket 301, the second socket 302, the first ferrule 201 and the second ferrule 202 of the present embodiment are corresponding positive sockets, negative sockets, positive ferrules, and The negative ferrule is described as an example. In other embodiments, the electrical plug-in device 100 may further include one or more ferrules and a corresponding number of sockets, which are not limited herein. The first ferrule 201 is detachably engaged with the first socket 301, and the second ferrule 202 and the second socket 302 are also detachably coupled, and the first ferrule 201 and the first socket 301 are 301. There is elastic arcuate contact between the second ferrule 202 and the second socket 302. Therefore, the electrical plug-in device 100 of the present embodiment is configured to be detachably connected between the first ferrule 201 and the first socket 301, and the second ferrule 202 and the second socket 302. The electrical plug-in device 100 is quick and easy to be plugged in, so that the battery pack of the electrical plug-in device 100 of the embodiment is easy to connect, and the battery is quickly and easily replaced, and the first ferrule 201 of the embodiment is The first socket 301, and the second ferrule 202 and the second socket 302 are in elastic arc-face contact, which can effectively increase the effective contact area between the ferrule assembly 200 and the socket assembly 300, thereby facilitating the increase of the electrical insertion. The load current of the device 100 is connected.

Please refer to FIG. 3 to FIG. 4, FIG. 3 is a structural sectional view of the electrical plug-in device of FIG. 1, and FIG. 4 is a schematic exploded view of the three-dimensional structure of the electrical plug-in device of FIG. As shown in FIG. 3-4, in a specific embodiment, the ferrule assembly 200 further includes a ferrule housing including a first carrier plate 203 and a first sleeve 204, wherein the first ferrule 201 The second ferrule 202 is fixed to the first carrier plate 203 by the first sleeve 204.

The first sleeve 204 is injected into the first ferrule 201, the second ferrule 202 and the first carrier 203 by injection molding, so that the first ferrule 201, the second ferrule 202, and the first sleeve The 204 is formed in a unitary structure with the first carrier plate 203, so that the ferrule assembly can be formed by one molding, thereby simplifying the assembly structure of the electrical plug device 100, and improving the reliability of the electrical plug device 100.

In a specific embodiment, the ferrule housing further includes a connecting plate 206 and a spring 205 elastically supported between the first carrying plate 203 and the connecting plate 206 so that the ferrule assembly 200 and the socket assembly 300 can be The elastic pressure is maintained at all times, thereby ensuring a good contact between the ferrule assembly 200 and the socket assembly 300.

In a specific embodiment, the ferrule housing further includes a fixing sleeve 207 sleeved on the outer circumference of the first carrier plate 203 and fixed to the connecting plate 206, so that the embodiment can be inserted through the fixing sleeve 207. The core assembly 200 is fixed to the connecting plate 206 to improve the reliability of the electrical plug device 100.

The ferrule assembly 200 further includes a connector 208. The bottom of the first ferrule 201 is provided with an insertion hole 2011. One end of the connector 208 is inserted and fixed in the insertion hole 2011, and the other end of the connector 208 is from the first carrier. The side 203 is exposed away from the side of the first ferrule 201, and the joint 208 is used to connect the first ferrule inlet 209 such that the first ferrule inlet 209 is electrically connected to the first ferrule 201.

In a specific embodiment, the socket assembly 300 further includes a socket housing including a second carrier plate 303 and a second sleeve 304. The first socket 301 and the second socket 302 are fixed by the second sleeve 304. Two carrier plates 303.

The second sleeve 304 is injected into the first socket 301, the second socket 302 and the second carrier 303 by injection molding, so that the first socket 301, the second socket 302, the second sleeve 304 and the second The carrier plate 303 is formed as an integral structure, which simplifies the component structure of the electrical plug-in device 100 and improves the reliability of the electrical plug-in device 100.

Referring to Figures 4-6, as shown in Figures 4-6, in one embodiment, the first ferrule 201 is disposed in a columnar shape, and the outer surface of the first ferrule 201 forms an arcuate projection. The first socket 301 includes a first elastic piece 3012, and the first elastic piece 3012 is bent to match the shape of the curved convex portion, so that the first elastic piece 3012 is inserted into the first socket 301 when the first ferrule 201 is inserted into the first socket 301. The curved convex portion forms an elastic contact. Therefore, in the embodiment, by configuring the structure of the first socket 301 and the first ferrule 201 in such a manner, the relationship between the first ferrule 201 and the first socket 301 can be increased. The contact area is advantageous for realizing a large load current, and the self-locking function can also be realized to a certain extent, thereby improving the reliability of the electrical plug-in device 100.

Specifically, the first socket 301 may further include a first cylinder 3011. The first end of the first elastic piece 3012 is connected to the first cylinder 3011 and is bent toward the inside of the first cylinder 3011, and the second elastic piece 3012 is second. The end is in contact with the inner wall of the first cylinder 3011, and the area between the first end and the second end of the first elastic piece 3012 is spaced apart from the inner wall of the first cylinder 3011 and is bent to match the curved convex portion. As shown in Figure 5. The first cylinder 3011 and the first elastic piece 3012 can be formed by a metal sheet winding forming process, and the metal sheet includes, but not limited to, a metal or an alloy such as aluminum or titanium.

Wherein, the radial width of the arcuate convex portion of the outer surface of the first ferrule 201 is gradually reduced from the central portion to the two sides thereof, so that the first ferrule 201 and the first socket 301 can further achieve better self-locking. The function, that is, when the first ferrule 201 is inserted into the interior of the first socket 301, the first ferrule 201 does not easily slide from the first socket 301 due to the largest radial width of the central portion of the curved protrusion. Therefore, the reliability of the electrical plug-in device 100 is further improved.

In a specific embodiment, the second ferrule 202 is disposed in a cylindrical shape, and the inner surface of the second ferrule 202 forms an arcuate recess (not shown). The second socket 302 includes a second elastic piece 3022, and the second elastic piece 3022 is bent to match the shape of the curved concave portion, so that when the second ferrule 202 is inserted into the outer periphery of the second socket 302, the second elastic piece 3022 is The arcuate recess forms an elastic contact. Therefore, the embodiment can increase the contact area between the second ferrule 202 and the second socket 302, thereby facilitating a large load current, and can also achieve a self-locking function to a certain extent. The reliability of the electrical plug-in device 100 is improved.

Specifically, the second socket 302 further includes a second cylinder 3021. The first end of the second elastic piece 3022 is connected to the second cylinder 3021 and bent to the outside of the second cylinder 3021, and the second end of the second elastic piece 3022 In contact with the outer wall of the second cylinder 3021, the area between the first end and the second end of the second elastic piece 3022 is spaced from the inner wall of the second cylinder 3021 and is bent to match the shape of the curved recess. ,As shown in Figure 6. The second cylinder 3021 and the second elastic piece 3022 can be formed by a metal sheet winding forming process, and the metal sheet includes, but not limited to, a metal or an alloy such as aluminum or titanium.

Wherein, the radial width of the arcuate recess gradually decreases from the central portion to the two sides thereof, so that the second ferrule 202 and the second socket 302 can further achieve a better self-locking function, so that the second socket 302 can be inserted. When placed in the interior of the second ferrule 202, since the radial width of the middle portion of the arcuate recess portion is the largest, the second socket 302 will form a clamping structure with the second ferrule 202, so that the second socket 302 is not It is easy to slide out of the second ferrule 202, thereby further improving the reliability of the electrical plug-in device 100, thereby improving the reliability of the entire electrical plug-in device 100.

In this embodiment, the second cylinder 3021 is nested in the outer periphery of the first cylinder 3011, and an insulating spacer 305 is further disposed between the first cylinder 3011 and the second cylinder 3021. The insulating spacer 305 is used for The first socket 301 is insulated from the second socket 302. The second sleeve 304 is injected into the first cylinder 3011, the second cylinder 3021, the insulating spacer 305 and the second carrier 303 by injection molding, so that the socket assembly 300 of the electrical plug device 100 and The adjacent components are formed in a one-piece structure, which simplifies the component structure of the electrical plug-in device 100 and improves the overall reliability of the electrical plug-in device 100.

In this embodiment, the second carrier 303 is formed with an opening cavity at one end. The first socket 301 and the second socket 302 are fixed in the accommodating cavity, and the first ferrule 201 and the second ferrule 202 are accommodating. The open end of the cavity is inserted into the accommodating cavity, and is respectively inserted into the first socket 301 and the second socket 302 to realize the detachable plug-in cooperation of the ferrule assembly 200 and the socket assembly 300. By disposing the second carrier plate 303 as a structure for accommodating the cavity, part of the components of the socket assembly 300 and the ferrule assembly 200 can be accommodated in the accommodating cavity to prevent damage caused by the component being exposed.

Referring further to FIG. 7, FIG. 7 is a cross-sectional view showing the structure of the ferrule assembly 200 and the socket assembly 300 of the electrical plug-in device 100 of FIG. As shown in FIG. 7, the first ferrule 201 of the electrical plug-in device 100 is disposed in a column shape and is inserted into the interior of the first socket 301. The outer surface of the first ferrule 201 forms an arc-shaped convex portion and is curved convex. The radial width of the starting portion gradually decreases from the central portion to the both sides thereof. The first elastic piece 3012 of the first socket 301 is bent to match the shape of the curved convex portion, thereby causing the first socket 301 to make elastic contact with the arcuate convex portion of the first ferrule 201.

The second ferrule 202 is disposed in a cylindrical shape and is inserted into the outer periphery of the second socket 302. The inner surface of the second ferrule 202 forms an arcuate recess, and the radial width of the arcuate recess gradually increases from the central portion to the two sides thereof. Reduced. The second elastic piece 3022 of the second socket 302 is bent to match the shape of the arcuate recess, thereby causing the second socket 302 to make elastic contact with the arcuate recess of the second ferrule 202.

Specifically, the first ferrule 201 is inserted into the first socket 301, the second socket 302 is nested in the periphery of the first socket 301, and the insulating spacer 305 is disposed between the first socket 301 and the second socket 302. The second sleeve 304 is sleeved on the outer periphery of the insulating spacer 305, the second ferrule 202 is inserted on the outer periphery of the second socket 302, and the second carrier 303 is sleeved on the outer periphery of the second ferrule 202. The receiving plate 303 is formed as an accommodating cavity that is open at one end, so that the first socket 301, the second socket 302, the second sleeve 304 and the insulating spacer 305 are accommodated in the accommodating cavity of the second carrier 303, and When the ferrule assembly 200 is mated with the socket assembly 300, the second ferrule 202 and a portion of the first ferrule 201 are also received in the accommodating cavity of the second carrier 303.

In this embodiment, the first socket 301, the second socket 302, the insulating spacer 305 and the second sleeve 304 are fixed on the second carrier 303, and the second sleeve 304 can be injected into the second sleeve 304 by injection molding. The first cylinder 3011 of one socket 301, the second cylinder 3021 of the second socket 302, the insulating spacer 305 and the second carrier 303 are integrally formed to simplify the structure of the socket assembly 300.

The second socket 304 and the second carrier 303 are respectively provided with corresponding at least two through holes, so that the first socket inlet 306 and the second socket inlet 307 respectively pass through the through hole and the first socket 301. And the second socket 302 is electrically connected.

In this embodiment, the first ferrule 201 and the second ferrule 202 are fixed on the first carrier 203 by the first sleeve 204, and the spring 205 is elastically supported between the first carrier 203 and the connecting plate 206, thereby The ferrule assembly 200 and the socket assembly 300 can be kept at a certain elastic pressure, so that a good contact state can be maintained between the ferrule assembly 200 and the socket assembly 300.

The outer sleeve of the first carrier plate 203 is sleeved with a fixing sleeve 207, and the fixing sleeve 207 is fixedly connected with the connecting plate 206.

Moreover, the bottom of the first ferrule 201 is provided with an insertion hole 2011. One end of the joint 208 is inserted and fixed in the insertion hole 2011, and the other end of the joint 208 is away from the first ferrule 201 from the first carrier 203. One side is exposed.

In this embodiment, at least two through holes are respectively disposed on the connecting plate 206, the first supporting plate 203 and the first sleeve 204, and the first ferrule inlet 209 passes through one of the through holes and the first ferrule 201. The connector 208 is electrically connected, and the second ferrule inlet 210 is electrically connected to the second ferrule 202 through another through hole.

Therefore, the ferrule assembly 200 and the socket assembly 300 of the electrical plug-in device 100 of the present embodiment can realize quick insertion and insertion, facilitate replacement of the battery pack, and the ferrule assembly 200 and the socket assembly 300 are in elastic arc-shaped contact, which can effectively increase The contact area enables the electrical plug-in device 100 to achieve a large load current, and can also achieve a self-locking function to a certain extent, improving the reliability of the electrical plug-in device 100.

Hereinafter, the present invention also discloses an electric vehicle including a vehicle body and a battery assembly detachably fixedly mounted in the vehicle body, wherein the battery assembly can pass through the electrical plug device 100 and the vehicle in the above embodiment The circuits in the body make electrical connections. In a specific embodiment, the battery assembly can be coupled to the ferrule assembly 200 in the electrical plug device 100, the socket assembly 300 is secured to the vehicle body and coupled to circuitry in the vehicle body such that the ferrule assembly 200 and the receptacle assembly The detachable plug-in combination of the 300 enables quick replacement of the battery components of the electric vehicle to meet user needs and improve the user experience.

In summary, the electrical plug-in device and the electric vehicle provided by the embodiment of the present invention, wherein the electrical plug-in device includes a socket assembly and a ferrule assembly, the socket assembly includes a first socket and a second socket disposed on a periphery of the first socket The ferrule assembly includes a first ferrule and a second ferrule sleeved on a periphery of the first ferrule, so that the first ferrule is detachably engaged with the first socket, and the second ferrule and the second socket are also The mate is detachably coupled, and the elastic between the first ferrule and the first socket and between the second ferrule and the second socket is elastic arc-face contact, so that the electrical plug-in device can be quickly inserted. It is convenient to quickly replace the battery pack of the electric vehicle, and can increase the effective contact area of the electric plug device, so that the electric plug device can realize a large current load.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims (20)

An electrical plug-in device, wherein the electrical plug-in device includes a socket assembly and a ferrule assembly, the socket assembly includes a first socket and a second socket sleeved on a periphery of the first socket, the ferrule The assembly includes a first ferrule and a second ferrule sleeved on a periphery of the first ferrule, the first ferrule being detachably mated with the first socket, the second ferrule Removably mating with the second socket, the first ferrule and the first socket and the second ferrule and the second socket are in elastic arcuate contact. The electrical plug-in device according to claim 1, wherein the first ferrule is disposed in a column shape, an outer surface of the first ferrule forms an arcuate convex portion, and the first socket includes a first elastic piece The first elastic piece is bent to match the shape of the curved convex portion, thereby forming elastic contact with the curved convex portion. The electrical plug-in device according to claim 2, wherein the radial width of the arcuate projection gradually decreases from the central portion to the both sides thereof. The electrical plug-in device according to claim 2, wherein the second ferrule is disposed in a cylindrical shape, an inner surface of the second ferrule forms an arcuate recess, and the second socket includes a second elastic piece And the second elastic piece is bent to match the shape of the arcuate concave portion, thereby forming elastic contact with the arcuate concave portion. The electrical plug-in device according to claim 4, wherein the radial width of the arcuate recess gradually decreases from the central portion to both sides thereof. The electrical plug-in device according to any one of claims 1 to 5, wherein the ferrule assembly further comprises a ferrule housing, the ferrule housing comprising a first carrier plate and a first plate sleeve, The first ferrule and the second ferrule are fixed to the first carrier plate by the first sleeve. The electrical plug-in device according to claim 6, wherein the ferrule housing further comprises a connecting plate and a spring, the spring being elastically supported between the first carrier plate and the connecting plate. The electrical plug-in device according to claim 7, wherein the ferrule housing further comprises a fixing sleeve which is disposed on an outer circumference of the first carrier plate and is fixed to the connecting plate. The electrical plug-in device according to claim 6, wherein the ferrule assembly further comprises a joint, the bottom of the first ferrule is provided with an insertion hole, and one end of the joint is inserted and fixed to the insertion The other end of the joint is exposed from a side of the first carrier plate away from the first ferrule. The electrical plug-in device according to claim 6, wherein the first sleeve is injection-molded between the first ferrule, the second ferrule, and the first carrier. The electrical plug-in device according to claim 4, wherein the first socket further comprises a first cylinder, the first end of the first elastic piece is coupled to the first cylinder and to the first cylinder The inner end of the body is bent, the second end of the first elastic piece is in contact with the inner wall of the first cylinder, and the area between the first end of the first elastic piece and the second end of the first elastic piece is The inner walls of the first cylinder are spaced apart and are bent to match the shape of the arcuate projections. The electrical plug-in device according to claim 11, wherein said first cylinder and said first elastic piece are formed by a metal sheet winding forming process. The electrical plug-in device according to claim 11, wherein the second socket further comprises a second cylinder, the first end of the second elastic piece is connected to the second cylinder and to the second cylinder The outer portion of the body is bent, the second end of the second elastic piece is in contact with the outer wall of the second cylinder, and the area between the first end of the second elastic piece and the second end of the second elastic piece is The inner walls of the second cylinder are spaced apart and are bent to match the shape of the arcuate recesses. The electrical plug-in device according to claim 13, wherein said second cylinder and said second elastic piece are formed by a metal sheet winding forming process. The electrical plug-in device according to claim 13, wherein the second cylinder is nested around a periphery of the first cylinder, and an insulating spacer is further disposed therebetween. The electrical plug-in device according to claim 15, wherein the socket assembly further comprises a socket housing, the socket housing comprising a second carrier plate and a second sleeve, the first cylinder, the first The second cylinder and the insulating spacer are fixed to the second carrier by the second sleeve. The electrical plug-in device according to claim 16, wherein the second sleeve is injection-molded into the first cylinder, the second cylinder, the insulating spacer, and the second carrier between. The electrical plug-in device according to claim 16, wherein the second carrier plate forms an accommodating cavity that is open at one end, and the first socket and the second socket are fixed in the accommodating cavity, The first ferrule and the second ferrule are inserted into the accommodating cavity through the open end of the accommodating cavity, and are respectively engaged with the first socket and the second socket. An electric vehicle, comprising: a vehicle body and a battery assembly detachably fixedly mounted in the vehicle body, the battery assembly being electrically plugged by any one of claims 1-18 The device is electrically connected to circuitry in the vehicle body. The electric vehicle according to claim 19, wherein said battery assembly is coupled to said ferrule assembly; said socket assembly being fixed to said vehicle body and coupled to an electrical circuit in said vehicle body.