KR102278902B1 - mobile charging device for electric vehicles - Google Patents

Abstract

A mobile charging device for an electric vehicle of the present invention includes a box-shaped cover 241 having a hollow portion therein, and a hinge 243 on an upper surface thereof, coupled to the cover 241 via the hinge 243, and the interior It is provided with a box-shaped body 242 having a hollow portion formed therein, a collision detection sensor S1 provided on one side of the body, and a structure protruding from the bottom surface of the cover 241, and an upper fixing portion having a through hole in the center A housing including a 244a and a structure protruding from the bottom of the body 242, a lower fixing part 244b having a through hole formed in the center, and a sealing rubber 245 provided on the rim of the body 242 (240), built in the housing 240, the wind roller 210 having a limit sensor (S2) on the rotation shaft, provided at the lower side of the wind roller 210, a guide roller for guiding the charging cable to pass through the opening 220, wound on the wind roller 210, guided by the guide roller 220, drawn out or rewound through the opening formed in the lower portion of the housing 240, the charging cable 230 with a stopper 231 formed on the outer surface ), a guide part 400 provided on the upper surface of the housing 240, and a guide rail 300 to which the guide part 400 is movably coupled is a gist.

Description

Mobile charging device for electric vehicles

The present invention relates to a charging device, and more particularly, to a mobile charging device for an electric vehicle capable of charging electricity to a small electric truck at night.

Countries around the world are promoting various support policies from various angles for the distribution and expansion of electric vehicles, and the distribution and diffusion of electric vehicles is a significant part of reducing fine dust and greenhouse gases in the transportation sector, thereby alleviating air pollution problems and improving energy use efficiency. is expected to contribute.

Considering that as of 2014, 23% of global carbon dioxide emissions are generated in the transport sector, the supply and spread of electric vehicles will greatly contribute to greenhouse gas reduction, and in order to reduce greenhouse gas emissions, not only electric cars but also cargo transport sectors such as cargo trucks Electric vehicles are also urgently needed.

Among the trucks, small cargo trucks are the first ones that can be converted to electric vehicles. Charging infrastructure is an important factor in introducing electric trucks, but compared to passenger cars, the route is simple and repetitive, so the focus is on the base area of highways or important points of delivery. to build a charging infrastructure.

Small electric trucks are mainly used for city and regional delivery, so they can be charged at night when they are not in operation.

In other words, electric trucks for urban delivery have an average daily driving distance of 42 km, which is shorter than other cargo transportation. It has the characteristics of operation and frequent stops, so it is suitable for the introduction of electric trucks.

Accordingly, a slow charging device capable of charging electricity to an electric truck at night has been developed.

1 is a schematic diagram of a conventional electric vehicle charging device.

As shown, the electric vehicle automatic charging control device according to an embodiment of the present invention uses a charging cable 105 that is movable along horizontal or vertical rails 103 and 104 attached to the ceiling of the parking lot. It is possible to charge the battery of the electric vehicle 101 located in the. At this time, the charging cable 105 on the ceiling can be controlled by a motor, etc., after moving quickly to a desired place, while lowering the charging cable 105, the charging adapter 102 is drawn out over the vehicle roof by finely adjusting the position. A configuration that can be connected with is known.

However, the conventional charging device cannot prevent collisions between chargers, it is not easy to maintain when the charger fails, and the transfer of the charger is not performed stably, so there is a risk of a safety accident.

The following prior art documents are registered patent publications filed and registered by the present applicant.

Registered Patent Publication No. 10-1895550 (2018.10.24. Announcement)

The present invention is to solve the above problems, to prevent collisions between charging devices, maintenance can be made easily in case of a failure of the charging device, and to minimize the risk of safety accidents by stably transferring the charging devices. It is intended to provide a portable charging device for electric vehicles that can

A mobile charging device for an electric vehicle according to the present invention includes a box-shaped cover having a hollow portion formed therein, a hinge provided on the upper surface, coupled to the cover through the hinge, and a box-shaped body having a hollow portion formed therein; It is provided with a collision detection sensor provided on one side, a structure protruding from the bottom surface of the cover, an upper fixing part having a through-hole formed in the center, and a lower fixing part having a structure protruding from the bottom surface of the body, and having a through-hole formed in the center And, a housing comprising a sealing rubber provided on the rim of the body, a wind roller built in the housing and having a limit sensor on the rotation shaft, a guide roller provided below the wind roller to guide the charging cable through the opening, A charging cable wound on a wind roller, guided by a guide roller, drawn out or rewound through an opening formed in the lower portion of the housing, a charging cable having a stopper formed on the outer surface, a guide provided on the upper surface of the housing, and a guide coupled to move the guide It is characterized in that it includes a rail.

In addition, the guide unit includes a front cover formed of a 'C'-shaped plate with open top, bottom and rear, a rear cover for shielding a 'C'-shaped opening with an open rear of the front cover, and a combined front An upper cover for shielding the upper surfaces of the cover and the rear cover, a recessed portion into which a guide rail can be inserted is formed in the central portion, and an upper wheel coupled to an upper rotational shaft of a bracket provided on the inner surface of the front cover so as to be rotatable; A concave portion into which the guide rail can be inserted is formed in the central portion, and the lower wheel is rotatably coupled to the lower rotating shaft of the motor provided on the inner surface of the front cover; It is characterized in that the grip portion is formed on the upper end of the upper cover.

In addition, the guide rail is in the shape of a hole penetrated at the end, a cut-out groove is formed at the upper end, and is coupled with a coupling hole communicating with the outside, and a structure of force fitting in the coupling hole, and a coupling rod having a sawtooth shape on the upper surface It is characterized in that it includes.

In addition, the sawtooth shape of the upper surface of the coupling rod is formed of a left inclined surface and a right inclined surface,

It is characterized in that the left inclined surface and the right inclined surface are provided with opposite inclination directions.

In addition, it is characterized in that the ring-shaped lining formed of hard rubber or synthetic resin is attached to the lower wheel.

In addition, a charging connector is provided at the end of the charging cable; It is characterized in that the charging indicator is provided on the upper surface of the charging connector.

In addition, the charging indicator light is characterized in that the plurality of steps are formed from a short bar shape to a long bar shape.

In addition, the upper surface of the charging connector is characterized in that the coating material is applied.

In addition, the material of the sealing rubber is 20 to 28 parts by weight of a fatty acid amide compound, which is a water repellent, based on 100 parts by weight of the rubber component, 35 to 50 parts by weight of carbon black, 0.02 to 4 parts by weight of cobalt, 3 to 3 to quinone-imine antioxidants 8 parts by weight, characterized in that it consists of a composition comprising 0.4 to 9 parts by weight of diimine.

The present invention has the effect of preventing collision between charging devices, facilitating maintenance when the charging device fails, and stably transporting the charging device, thereby minimizing the risk of safety accidents.

In addition, there is an effect that can continuously maintain the sealing force of the cover and the body.

In addition, by preventing the charging cable from coming into contact with the electric truck or the user, there is an effect that the charging can be completed more conveniently while preventing a safety accident due to electric shock.

In addition, there is an effect that the guide rail can be firmly, easily coupled and separated.

In addition, due to the charging indicator displayed in multiple stages, there is an effect that the user can easily identify the charging state with the naked eye from the outside of the electric truck.

In addition, since the user can visually identify the overheating state of the charging connector from the outside, it is possible to prevent the user's body from being burned by contact with the overheated charging connector.

1 is a schematic view of a conventional electric vehicle charging device.
Figure 2 is a schematic diagram of a state of use of the electric vehicle mobile charging device of the present invention.
3 is a schematic cross-sectional view of a charging device;
Figure 4 is a perspective view of the opening and closing state of the charging device housing.
5 is a perspective view of a guide.
6 is an exploded perspective view of a guide.
7 is a perspective view of a state before coupling of the guide rail.
8 is an enlarged cross-sectional view of the coupling state of the guide rail and the coupling rod;
9 is a cross-sectional view of the lower wheel;
10 is a perspective view of a charging connector;

A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. For reference, sizes of components, thicknesses of lines, etc. shown in the drawings referenced to describe the present invention may be expressed somewhat exaggeratedly for convenience of understanding.

In addition, the terms used in the description of the present invention are defined in consideration of the functions in the present invention, and thus may vary according to user, operator intention, custom, and the like. Therefore, the definition of this term should be made based on the content throughout the present specification.

And in the present application, terms such as 'comprise' and 'have' refer to the existence of a specific number, step, operation, component, part, or combination thereof described in the specification, but one or more other It is to be understood that this does not preclude the possibility of addition or presence of features or numbers, steps, operations, components, parts, or combinations thereof.

In addition, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only this embodiment allows the disclosure of the present invention to be complete, and the scope of the invention to those of ordinary skill in the art It is provided for complete disclosure.

Therefore, the present invention can be made various changes and can have various forms, implementation examples (態樣, aspect) (or embodiments) will be described in detail in the specification. However, this is not intended to limit the present invention to a specific disclosed form, and it should be understood to include all changes, equivalents or substitutes included in the technical spirit of the present invention, and the expression in the singular used herein is clearly different from the context. Unless otherwise indicated, plural expressions are included.

However, in describing the present invention, detailed descriptions of well-known or well-known functions or configurations will be omitted in order to clarify the gist of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

Figure 2 is a schematic diagram of a use state of the mobile charging device for an electric vehicle of the present invention, Figure 3 is a schematic cross-sectional view of the charging device, Figure 4 is a perspective view of the opening and closing state of the charging device housing.

As shown, the present invention 'mobile charging device for electric vehicle' (200. hereinafter referred to as 'charging device') is a control signal of a control box (not shown) provided at one side of a charging place such as an indoor or outdoor parking lot. Accordingly, the electric vehicle can be charged while moving left and right along the guide rail 300 , and is roughly divided into a wind roller 210 , a guide roller 220 , a charging cable 230 , and a housing 240 .

The housing 240 includes a cover 241 , a body 242 , a hinge 243 , an upper fixing part 244a , a lower fixing part 244b , and a sealing rubber 245 .

The cover 241 has a box shape with a hollow portion formed therein, and is coupled to a body 242 and a hinge 243 to be described later, so that the body 242 can be opened and closed.

As described above, since the cover is provided so as to be openable and openable, maintenance can be made easily in case of a failure of the charging device by simply opening the cover, thereby having the effect of facilitating maintenance and repair.

The body 242 is provided with a hinge 243 on the upper surface, is coupled to the cover 241 via the hinge 243, and has a box shape with a hollow inside, and the hollow is described later. A wind roller 210 and a guide roller 220 are built-in.

In addition, a collision detection sensor (S1) is provided on one side of the body, so that when the charging device 200 moves, it has a function of preventing a collision with another charging device adjacent thereto.

The upper fixing part 244a is provided in a structure protruding from the bottom surface of the cover 241, and a through hole is formed in the center, so that it coincides with the through hole formed in the lower fixing part 244b to be described later, and is fixed with a bolt or the like. The cover 241 and the body 242 are firmly coupled and fixed by means.

The lower fixing part 244b is provided in a structure protruding from the bottom surface of the body 242, and a through hole is formed in the center, so that it coincides with the through hole formed in the above-described upper fixing part 244a, and is fixed with a bolt or the like. The cover 241 and the body 242 are firmly coupled and fixed by means.

The sealing rubber 245 is provided on the edge of the body 242 .

It goes without saying that a plurality of the upper fixing part and the lower fixing part may be installed.

The charging device in this embodiment is often installed outdoors, such as a parking lot, and since the sealing rubber 245 comes in contact with rainwater, etc., it is corroded due to moisture, so rainwater can enter the body and cause a malfunction, In this embodiment, the material of the sealing rubber 245 is specified to present a configuration that minimizes corrosion by rainwater.

The material of the sealing rubber 245 is 20 to 28 parts by weight of a fatty acid amide compound, which is a water repellent, based on 100 parts by weight of the rubber component, 35 to 50 parts by weight of carbon black, 0.02 to 4 parts by weight of cobalt, quinone-imine-based antioxidant 3 to 8 parts by weight, and consists of a rubber composition containing 0.4 to 9 parts by weight of diimine.

The rubber composition as described above has improved corrosion resistance and heat aging resistance, can prevent rubber deterioration, and has a reinforcing effect, so that it has excellent durability even when exposed to rain for a long time.

As such, by adopting a rubber composition that can minimize corrosion and aging as a material of the sealing rubber 245, the cover and body coupled through the sealing rubber 245 have a function of continuously maintaining the sealing force. will become

The wind roller 210 is built in the housing 240 , the charging cable 230 is wound, and is connected to a motor (not shown). A limit sensor (S2) is provided on the rotating shaft of the wind roller.

When an electric freight car is parked at a charging place such as a parking lot at night, and the user sends a charging signal from a control box (not shown), etc., the wind roller 210 rotates, and the charging cable 230 wound around the wind roller 210 ) descends through the opening formed in the lower part of the housing 240 so that the user can charge it.

The guide roller 220 is provided under the wind roller 210 inside the housing, and has a function of guiding the charging cable to pass through the opening.

The charging cable 230 is wound on the wind roller 210, guided by the guide roller 220, and may be drawn out or rewound through an opening formed in the lower portion of the housing 240, and the outer surface of the end of the charging cable. A stopper 231 is formed there.

Of course, the other end of the charging cable is connected to a power source.

Such a charging cable 230, when the user sends a signal that the charging is completed from the control box, is wound on the wind roller 210 by the rotation of the motor. When the charging cable is almost wound on the wind roller, the stopper 231 comes into contact with the bottom of the housing 240, and when the limit sensor S2 senses the contacted resistance, the motor stops driving and blocks the charging cable from flowing into the housing while the vehicle and the user This is to prevent contact with the charging cable.

Looking at the operation relationship of the above charging device, the electric freight car is parked in a charging place such as a parking lot for charging, and the user sends a signal from the control box to move the charging device 200 to the upper side of the electric freight car.

At this time, when the collision detection sensor S1 detects another charging device located on the guide rail 300, the controller (not shown) stops the driving of the charging device.

When the charging device is located on the upper side of the electric truck in a state where the collision is avoided, the user sends a signal from the control box to rotate the wind roller 210, and draws the charging cable 230 to the charging position of the electric vehicle. , the user starts charging. When charging is completed, the user sends a signal from the control box, and leads the charging cable into the housing 240 .

Therefore, by preventing the charging cable from coming into contact with the electric truck or the user, it is possible to complete charging more conveniently while minimizing safety accidents caused by electric shock.

Hereinafter, the structure of the guide unit will be described.

The guide part is provided on the upper surface of the housing, and is coupled to the guide rail to be movable to move the housing of the mobile charging device in the longitudinal direction of the guide rail.

5 is a perspective view of the guide, and FIG. 6 is an exploded perspective view of the guide.

As shown, the guide 400 includes a front cover 410, a rear cover 420, an upper cover 430, an upper wheel 440a, and a lower wheel 440b.

The front cover 410 is formed of a 'C'-shaped plate with open top, bottom, and rear, and an upper wheel 440a and a lower wheel 440b to be described later are provided therein.

The rear cover 420 is a configuration that shields the 'C'-shaped opening in which the rear of the front cover is opened, and is coupled to the front cover 410 by a known fixing means such as a bolt.

The top cover 430 shields the upper surfaces of the combined front cover 410 and the rear cover 420 to protect the upper wheel 440a and the lower wheel 440b provided therein from external dust or rainwater. It is connected with known fixing means such as bolts.

A gripping part 431 is formed at the upper end of the top cover, so that when disassembling the front and rear covers and the top cover, it functions to facilitate the user's gripping.

The upper wheel 440a is formed with a concave portion into which the guide rail 300 can be inserted in the central portion, and is rotatable on the upper rotational shaft 442a of the bracket 441 provided on the inner surface of the front cover 410 . combined to do

The lower wheel 440b is formed with a recessed portion into which the guide rail 300 can be inserted, and is rotatably coupled to the lower rotating shaft 442b of the motor provided on the inner surface of the front cover 410, have.

Looking at the operating relationship of such a guide,

When the user sends a signal for charging from the control box, the control unit drives the motor to move the guide unit 400 to the left and right of the guide rail 300 to move the charging device to the charging position, and the front cover ( 410), the rear cover 420, and the upper cover 430 are easily disassembled and combined, which has the effect of making maintenance and repair easier.

In the following embodiment, the joint structure of the guide rail will be described.

When the length of the guide rail installed on the upper part of the charging station is long, it is necessary to connect the guide rail in succession. In this embodiment, the joint structure of the guide rail is presented.

7 is a perspective view of a state before coupling of the guide rail, and FIG. 8 is a cross-sectional view of the coupling state of the guide rail and an enlarged cross-sectional view of the coupling rod.

As shown, a coupling rod 310 and a coupling hole 320 are formed at the end of the guide rail 300 .

The coupling hole 320 is provided in the shape of a hole penetrated at the end of the guide rail 300 , and a cut-out groove 311 is formed at the upper end of the coupling hole 320 to communicate with the outside.

The coupling rod 310 is coupled to the coupling hole in a structure of interference fit, and the upper surface of the coupling rod 310 has a sawtooth-shaped left inclined surface 312a and a right inclined surface 312b, and a left inclined surface ( 312a) and the right inclined surface (312b) are characterized in that the inclined direction is formed in the opposite direction.

Looking at the operating relationship of this guide rail joint structure,

When combining the two separated guide rails 300 to install them in the charging place, the upper surface of the coupling rod 310 in the coupling hole 320 of one guide rail faces the incision groove 311. , hammer, etc. to protrude by a certain length, and drive, force, and fit.

Then, the protruding coupling rod 310 is fitted into the coupling hole 320 of the other guide rail, and then the striking tool is inserted into the upper incision groove 311, and the ends of the striking tool are located on the left and right inclined surfaces of the coupling rod. By applying a blow while in contact, the coupling rod protruding from one side of the guide rail is pressed and fitted into the coupling hole of the other guide rail, so that the two guide rails can be firmly and easily coupled.

Then, when it is necessary to separate the guide rail for reasons such as repair or maintenance, insert the striking tool into the incision groove and apply a blow while the end of the striking tool is in contact with the inclined surface of the connecting rod to separate the connecting rod from the other guide rails. It can be separated by moving it to the coupling hole.

In addition, by embedding a heating coil (not shown) inside the guide rail, it goes without saying that it can have a function of melting and removing snow accumulated on the guide rail in winter.

In the following embodiment, the structure of the lower wheel will be described.

The lower wheel installed outdoors and in contact with the guide rail is exposed to sunlight and moisture, and the contact part between the lower wheel and the guide rail wears out when used for a long time, and when the charging device is moved, noise is generated or it fluctuates due to corrosion, etc. There is a possibility that this may occur, and in this embodiment, a structure is provided for easy maintenance and repair by attaching a lining to the lower wheel.

9 is a cross-sectional view of the lower wheel.

As shown, this embodiment is characterized in that the lining 443 is provided on the protrusion and the concave portion of the lower wheel (440b).

Specifically,

The lower wheel 440b is integrally molded by aluminum die casting or hard resin injection molding, and a concave portion capable of accommodating the guide rail 300 is formed on the circumference of the molded lower wheel 440b. A protrusion is formed to prevent the lower wheel 440b from being separated from the guide rail 300 .

A ring-shaped lining 443 made of hard rubber or synthetic resin is attached to the concave and protruding portions of the lower wheel 440b to prevent the lower wheel 440b from being in direct contact with the guide rail 300 and from being worn out. While it is possible to prevent noise generated by friction between the lower wheel 440b and the guide rail 300 , and when the lining 443 is worn due to friction with the guide rail 300 , it can be easily replaced.

Of course, the upper wheel (440a) may also be provided with a lining.

Hereinafter, the structure of the charging connector will be described.

When the electric freight car is being charged, the state of charge can be checked by the gauge inside the electric freight car, so the user has no choice but to check the inside of the electric freight car to check the charging state, and the user There is a problem that the state of charge cannot be checked when it is located outside the vehicle, and this embodiment suggests a structure in which the state of charge can be checked even from the outside of the electric truck.

10 is a perspective view of a charging connector.

As shown, the present embodiment is characterized in that the charging connector 500 is provided with a charging indicator 510 .

Specifically,

A charging indicator 510 made of a light emitting diode or the like is provided on the upper surface of the charging connector 500 provided at the end of the charging cable 230, and the charging indicator 510 has a length from a short bar shape. Since a plurality of long bar-shaped multi-steps are formed, the charging state can be displayed in multi-steps, and when all of the longest charging indicators 510 emit light, it indicates that charging is complete.

The light emitting diode is a type of diode that emits light when current flows and is used as a light source in the field of optical communication. As a material, gallium, arsenic, phosphorus, etc. are used, and there are effects such as high reliability, easy modulation, and stable operation.

Due to the charging indicator 510 displayed in multiple stages as described above, there is an effect that the user can easily identify the charging state with the naked eye from the outside of the electric truck.

Another feature of the present embodiment is that the Zion material is applied to the upper surface of the charging connector.

The Zion paint is a pigment that discolors at a specific temperature, and the reversible Zion paint has a range of a reference temperature of -15°C to 70°C. In this embodiment, the temperature change from high temperature to low temperature or from low temperature to high temperature Zion material was prepared to include a temperature-responsive color change composition capable of sequentially exhibiting three or more colors according to the composition, and the composition was 8 to 10 parts by weight of zinc oxide, 10 to 15 parts by weight of titanium dioxide, and 100 parts by weight of the paint. It is characterized in that it is a temperature-sensitive color change composition further comprising 5 to 7 parts by weight of synamate, 10 to 22 parts by weight of two or more zion materials having different temperature zones and colors, and 20 to 30 parts by weight of a curing agent, respectively.

In this way, by applying the coating material on the upper surface of the charging connector, the user can visually check the overheating state of the charging connector 500 during charging, so that the user's body unconsciously comes into contact with the overheated charging connector and burns in advance. It may have a preventable effect.

200: mobile charging device 210: wind roller
220: guide roller 230: charging cable
231: stopper 240: housing
241: cover 242: body
243: hinge 244a: upper fixing part
244b: lower fixing part 245: sealing rubber
300: guide rail 310: coupling rod
311: incision groove 312a: left inclined plane
312b: right slope 320: coupling hole
400: guide 410: front cover
420: rear cover 430: top cover
431: grip portion 440a: upper wheel
440b: lower wheel 441: bracket
442a: upper rotation shaft 442b: lower rotation shaft
443: Lining 500: charging connector
510: charging indicator
S1: Collision detection sensor S2: Limit sensor

Claims (9)

delete A box-shaped cover 241 having a hollow portion formed therein;
A hinge 243 is provided on the upper surface, coupled to the cover 241 via the hinge 243, and a box-shaped body 242 having a hollow portion therein;
A collision detection sensor (S1) provided on one side of the body;
It is provided in a structure protruding from the bottom surface of the cover 241, and an upper fixing part 244a having a through hole in the center thereof,
It is provided with a structure protruding from the bottom surface of the body 242, and a lower fixing part 244b having a through hole in the center thereof,
A housing 240 including a sealing rubber 245 provided on the rim of the body 242,
The wind roller 210 which is built in the housing 240 and is provided with a limit sensor S2 on the rotating shaft,
A guide roller 220 provided on the lower side of the wind roller 210 to guide the charging cable through the opening,
The charging cable 230 wound on the wind roller 210, guided by the guide roller 220, withdrawn or rewound through the opening formed in the lower portion of the housing 240, and having a stopper 231 formed on the outer surface thereof;
Guide 400 provided on the upper surface of the housing 240,
The guide 400 includes a guide rail 300 coupled to be movable,
The guide 400 is
A front cover 410 formed of a 'C'-shaped plate with open top, bottom and rear, and
A rear cover 420 for shielding the rear of the front cover 410 is a 'C'-shaped opening, and,
An upper cover 430 for shielding the upper surfaces of the combined front cover 410 and the rear cover 420, and
A concave portion into which the guide rail 300 can be inserted is formed in the central portion, and the upper wheel 440a is rotatably coupled to the upper rotation shaft 442a of the bracket 441 provided on the inner surface of the front cover 410. and,
A concave portion into which the guide rail 300 can be inserted is formed in the central portion, and the lower wheel 440b is rotatably coupled to the lower rotation shaft 442b of the motor provided on the inner surface of the front cover 410. ;
A mobile charging device for an electric vehicle, characterized in that a grip portion 431 is formed on the upper end of the top cover 430 . 3. The method of claim 2,
The guide rail 300 is
The shape of the hole through the end, the cut-out groove 311 is formed at the upper end, the coupling hole 320 communicated with the outside,
A mobile charging device for an electric vehicle, characterized in that it includes a coupling rod (310) coupled to the coupling hole (320) in a structure of interference fit and provided with a sawtooth shape on the upper surface. 4. The method of claim 3,
The sawtooth shape of the upper surface of the coupling rod 310 is,
It is formed of a left inclined surface (312a) and a right inclined surface (312b),
A mobile charging device for an electric vehicle, characterized in that the left inclined surface (312a) and the right inclined surface (312b) have opposite inclination directions. 5. The method of claim 4,
In the lower wheel (440b),
A mobile charging device for an electric vehicle, characterized in that a ring-shaped lining (443) formed of hard rubber or synthetic resin is attached. 6. The method of claim 5,
A charging connector 500 is provided at the end of the charging cable 230;
A mobile charging device for an electric vehicle, characterized in that a charging indicator light (510) is provided on the upper surface of the charging connector (500). 7. The method of claim 6,
The charging indicator 510 is,
A mobile charging device for an electric vehicle, characterized in that a plurality of steps are formed from a short bar shape to a long bar shape. 8. The method of claim 7,
On the upper surface of the charging connector 500,
A mobile charging device for an electric vehicle, characterized in that the Zion material is applied. 9. The method of claim 8,
The material of the sealing rubber 245 is,
Based on 100 parts by weight of the rubber component, 20 to 28 parts by weight of a fatty acid amide compound as a water repellent, 35 to 50 parts by weight of carbon black, 0.02 to 4 parts by weight of cobalt, 3 to 8 parts by weight of a quinone-imine antioxidant, 0.4 to 8 parts by weight of diimine A mobile charging device for an electric vehicle, characterized in that it consists of a composition comprising 9 parts by weight.

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