JPH104638A - Charger for electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charger for an electric vehicle which can simply charge the electric vehicle. SOLUTION: A secondary coil 30 is provided outside a wheel 20, and a tubular terminal 43 linked to the secondary coil 30 is laid at the disc 42, attached to a wheel 40. On the other hand, the main body of the vehicle body is provided with a terminal displacer 50, and it is arranged so that a charging circuit can be connected to the secondary battery 30, with the cable is in contact with a circular terminal 43. At the time of charging, an electric vehicle is parked, such that the secondary battery 30 faces the primary coil installed at the parking lot, and the secondary battery 30 and the charging circuit are connected with each other by the terminal displacer 50. Then, exciting the primary coil 70 will electromagnetically couple both coils 30 and 70 and charge the battery through the charging circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electric vehicle charging apparatus for charging an electric vehicle.

[0002]

2. Description of the Related Art Conventionally, a charging system as shown in FIG. 8 has been used for charging an electric vehicle. The vehicle body of the electric vehicle 1 is provided with a vehicle-side connector 2 connected to a power battery, to which a power supply connector 3 is connected from outside the vehicle. The power supply connector 3 is provided at the end of a cable 5 from a charging power source 4 installed outside the vehicle, and the power from the charging power source 4 is supplied to the power battery through both connectors 2 and 3 to perform charging. Will be

[0003]

In the charging system described above, the power supply connector 3 is taken out of the charging facility, carried to the automobile 1 while pulling out the cable 5, and the connector lid 1a of the vehicle body is opened to open the connector 2 on the vehicle side. It is necessary to connect to the device, which is quite troublesome. Moreover,
The conventional charging connector has a configuration in which terminals are fitted to each other to establish contact with each other to establish an energizing path. Therefore, the resistance of the fitting operation is large, and it is necessary to perform the fitting operation of the connector with a relatively large force. was there. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric vehicle charging apparatus that can easily charge an electric vehicle.

[0004]

[Means for Solving the Problems and Functions / Effects]

<Invention of claim 1> To achieve the above object, claim 1
According to the invention according to the invention, the secondary coil provided in the wheel of the electric vehicle is electromagnetically coupled to the primary coil connected to the external charging power supply provided in the parking lot, so that the electric vehicle is powered by the power of the external charging power supply. It is characterized in that a power storage device provided in a vehicle body is charged. With this configuration, the secondary coil is disposed on the side surface of the electric vehicle, and the electromagnetic coupling surface of the primary coil can be easily electromagnetically coupled to the electromagnetic coupling surface from the outside. <Invention of Claim 2> According to the invention of claim 2, in the electric vehicle charging apparatus according to claim 1, the secondary coil is mounted on a wheel, and the secondary coil is coaxially mounted on the wheel. The electric vehicle body is provided with a pair of vehicle-side terminals that are connected to the power storage device and are in contact with the pair of circular terminals, respectively. Have.

[0005] With this configuration, it is possible to electrically connect the rotating part between the wheel and the vehicle body. Therefore, even if the secondary coil is attached to the wheel, power can be transmitted to the power storage device provided on the vehicle body. Can be. Accordingly, a structure in which the secondary coil is provided in the wheel can be easily realized. <Invention of Claim 3> Further, according to the invention according to claim 3, in the charging device for an electric vehicle according to claim 2, the pair of vehicle body-side terminals are brought into a contact state and a non-contact state with the annular terminal. A feature is that a terminal displacement mechanism that enables switching is provided.

With such a configuration, the annular terminal and the vehicle body side terminal can be brought into contact with each other only when the vehicle stops during charging, and wear of both terminals can be prevented. <Invention of claim 4> Further, according to the invention according to claim 4, in the charging device for an electric vehicle according to the above-mentioned claim 1, the secondary coil is mounted on a wheel, and the secondary coil is connected to the power storage device for power. Has a pair of intermediate coils, one of the intermediate coils is rotatably provided on the wheel side and connected to a secondary coil, and the other intermediate coil is electromagnetically coupled with one of the intermediate coils on the vehicle body side. And is connected to the power storage device side.

In such a configuration, the rotating portion between the wheel and the vehicle body can be electrically connected by non-contact electromagnetic coupling, so that the connecting portion of the rotating portion can be connected without changing the connection state between charging and running. No wear. As a result, a structure in which the secondary coil is provided in the wheel can be easily realized, and a charging device for an electric vehicle having a highly reliable power supply path can be obtained. <Invention of Claim 5> The invention according to Claim 5 is a charging device for an electric vehicle according to any one of Claims 1 to 4, wherein the charging device is provided on a parking lot side and includes a wheel of the electric vehicle. Is provided with a wheel guide for guiding the secondary coil and the primary coil of the electric vehicle to the electromagnetic coupling position by guiding the vehicle.

[0008] With this configuration, the electric vehicle is guided by the wheel guide only by entering the parking lot,
Since the primary coil and the secondary coil are in a state where they can be electromagnetically coupled, the charging operation is facilitated.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a state in which an electric vehicle E enters a parking lot provided with a charging facility. The electric vehicle E uses a battery 10 (see FIG. 2), which is a power storage device, as a main power supply source. Electric power is supplied from the battery 10 and a driving motor and various electric devices (not shown) function.

FIG. 2 shows a charging power system of the electric vehicle E. Mainly, the charging power system includes a secondary coil 30 provided in each wheel 20 of the electric vehicle E and excitable from outside, and a secondary coil 3
0 is converted to direct current to convert the battery 1
And a charging circuit 11 for charging 0. As shown in FIG. 4, the secondary coil 30 is formed in a flat plate shape formed by winding an electric wire around a magnetic core made of, for example, ferrite, and housed in a protective case 31 made of, for example, a synthetic resin material. In addition, a plurality of through holes 31 are formed in the peripheral portion of the protective case 31.
a is formed and can be bolted to the wheel 20.

The wheel 20 is fixed to a wheel 21 supporting a rubber tire by a nut through a plurality of hub bolts 40a of an axle 40. A circular pedestal 22 is formed on the wheel 21 so as to surround the whole of a plurality of hub bolts 40a penetrating therethrough. When the secondary coil 30 is bolted to a screw hole 22a provided in the circular pedestal 22, the secondary coil 30 is formed. Are mounted coaxially within the same wheel 20 without interfering with the hub bolt 40a. When the secondary coil 30 is attached to the wheel 20, its electromagnetic coupling surface is substantially flush with the outer side surface of the rubber tire. The axle 40 is provided with a disk 42 that rotates with the axle 40 inside the bearing 41. As shown in FIG. 5, annular terminals 43 connected to both ends of the element wire of the secondary coil 30 are laid on both surfaces of the disk 42, respectively.
The surface of the annular terminal 43 is a conductive surface,
The disk 42 is insulated.

A cable connected to the charging circuit 11 extends from a support portion of the axle 40 in a body of the electric vehicle E, and a body-side terminal 51 provided at a terminal of the cable is connected to a terminal displacement device 50 described below. Ring terminal 4
3 can be switched between a contact state and a non-contact state. That is, the terminal displacement device 50 constitutes a clamp mechanism for clamping the disc 42, includes the vehicle body-side terminal 51 at the tip of the clamping portion, and closes the clamp mechanism to allow the pair of annular terminals 43 to move to the pair of vehicle body-side terminals. The secondary coil 30 is connected to the charging circuit 11 by bringing the terminals 51 into contact with each other. Thereby, the wear of the contact portion can be prevented by opening the clamp mechanism during traveling.
In FIG. 4, the wheel 20 having no drive shaft is shown as an example. However, in the wheel 20 having a drive shaft, the disk 42, the annular terminal 43, and the terminal A similar configuration is provided by providing a displacement device 50 and the like.

On the other hand, the parking lot is provided with an external power supply device 60, which is a power supply for external charging, to which four primary coils 70 are connected. Like the secondary coil 30, each primary coil 70 is also formed in a flat plate shape formed by winding an electric wire around a magnetic core made of ferrite, for example, and is accommodated in a protective case. The secondary coils 30 of the electric vehicle E and the electromagnetic coupling surfaces are disposed at the locations.

More specifically, a pair of rails 61, 61 for regulating the left and right wheels 20 of the electric vehicle E from the side, and a front side between the pair of rails 61, 61 are provided on the floor of the parking lot. And a wheel stopper 62 for determining the front / rear position of the electric vehicle E, so that the electric vehicle E is stopped at a certain place in the parking lot. A primary coil support 63 is projected upward from a portion of the rail 61 facing each wheel 20 of the electric vehicle E, and the primary coil 70 is incorporated therein. The rail 61 has a height that is necessary and sufficient to regulate the wheels 20 except for the primary coil support 63, and does not interfere with the rail 61 even when the door of the electric vehicle E is opened. Further, a pressure-sensitive sensor 64 is provided on a contact surface of the wheel stopper 62 with the wheel 20 so that it is possible to detect that the electric vehicle E has stopped in a state of contact with the wheel 20 stopper. . That is, the pressure-sensitive sensor 64 constitutes a parking position detecting means for detecting whether or not the electric vehicle E is parked at the regular charging position. Also, the electric vehicle E
In the state where the contact is made, for example, a lamp 60a provided in the external power supply device is turned on, so that the driver can recognize that charging is possible.

The electric vehicle E and the external power supply are provided with communication devices (not shown), respectively.
The charging of the external power supply device can be started by remote control from the electric vehicle E, or the charging state of the battery 10 can be transmitted to terminate the charging. next,
In this embodiment, a procedure for charging the electric vehicle E will be described. The electric vehicle E is advanced along the rail 61, and stops when the lamp is turned on. This state indicates that the wheel 20 of the electric vehicle E is in contact with the wheel stopper 62 and is parked at the proper charging position. here,
Since the electric vehicle E is guided to the regular charging position by the rail 61, the driver can easily park the vehicle at the regular charging position by proceeding with the electric vehicle E only by turning on the lamp.

The electric vehicle E is stopped at the regular charging position, and the respective secondary coils 30 in the four wheels 20 face the respective primary coils 70 provided in the parking lot. The driver turns on a charge start switch provided for the electric vehicle E. Then, the terminal displacement device 50 provided on the vehicle body of the electric vehicle E connects the secondary coil 30 to the charging circuit 11 and puts the electric vehicle E side in a charging standby state. Thereafter, a start command is transmitted to the external power supply device 60 by the communication device on the electric vehicle E side, the primary coil 70 is excited, and the secondary coil 3 is excited.
0 is electromagnetically coupled, and power is supplied to the battery 10. When the charging of the battery 10 is completed, a signal to that effect is transmitted from the electric vehicle E to the external power supply device 60, and the excitation of the primary coil 70 is stopped.

When the charged electric vehicle E is driven, the terminal displacement device 50 is opened to disconnect the connection between the secondary coil 30 and the charging circuit 11. Thereby, the running can be performed without abrasion of the connecting portion during running.
As described above, by providing the configuration in which the secondary coil 30 is provided in the wheel 20, the electromagnetic coupling surface of the secondary coil 30 can be attached to the lateral outside of the electric vehicle E, and the vehicle is provided in the parking lot. Electromagnetic coupling with the primary coil 70 can be easily achieved. As a result, both coils 30,
A guide for guiding the electric vehicle E to a position where the electromagnetic coupling 70 can be electromagnetically coupled can be realized with a simple configuration. Further, the secondary coil 30 can be exactly accommodated in the circular space of the wheel 20, and the appearance of the electric vehicle is not spoiled.

<Second Embodiment> In this embodiment, the connection of a rotating part between a charging circuit 11 fixed to a vehicle body and a secondary coil 30 provided on wheels 20 is made by a non-contact type (electromagnetic coupling type). ). As a configuration, as shown in FIG. 7, a pair of intermediate coils 80 and 81 are provided so as to be in a skewered state on the axle 40, and one of the intermediate coils 8 is provided.
0, the coil wire of the secondary coil 30 is fixed to the same axle 40, and in the other intermediate coil 81,
It is fixed to the vehicle body side by a spring 84 or the like so that it cannot rotate, and is connected to the charging circuit 11. This other intermediate coil 8
A bearing 83 is provided between the shaft 1 and the axle 40 so as to be rotatable. Due to these fixing and positioning, the electromagnetic coupling surfaces are brought close to each other while keeping the non-contact between the intermediate coils 80 and 81 so as to face each other. Similarly to the primary coil 70 and the secondary coil 30, the intermediate coils 80 and 81 are also formed in a flat plate shape formed by winding an electric wire around a ferrite core, for example, and are housed in a protective case. .

The other structure is the same as that of the first embodiment, and the same portions are denoted by the same reference numerals, and the description thereof will not be repeated. With such a configuration, since the rotating parts can be electrically connected in a non-contact manner, for example, a failure due to mud, dust, or the like, which may occur in a contact type, does not occur. In addition, since the distance between the electromagnetic coupling surfaces of the intermediate coils 80 and 81 is kept at a fixed distance by a bearing or the like, stable charging efficiency can be obtained. <Other Embodiments> The present invention is not limited to the above-described embodiments. For example, embodiments described below are also included in the technical scope of the present invention. Various changes can be made without departing from the scope of the invention. (1) In the first and second embodiments, the secondary coil 30
Is provided on each of the four wheels 20, but may be, for example, only the front wheel or the rear wheel, one of the left and right wheels, or only one wheel. (2) The secondary coil is provided so as to form a concentric circle with the wheel. However, it is sufficient that the secondary coil is provided so as to achieve a so-called wheel balance. For example, a plurality of small coils are fixed from the axle. May be arranged evenly on the circle. (3) In the first embodiment, a pair of annular terminals 43 are provided on both sides of the disk 42, and the disk 42 can be connected to the terminals by a terminal displacement device 50 that operates so as to sandwich the disk 42 from both sides. , As shown in FIG.
A pair of annular terminals 44 and 45 forming large and small concentric circles may be provided on one surface of the disk 42, and terminals on the charging circuit side may be provided so as to be separated from and connected to the annular terminals 44 and 45.

However, if the terminals are provided on both sides of the disk as in the present embodiment, the structure of the terminal displacement device can be simply constructed, and as described above, the terminal displacement device can be mounted on one surface of the disk. With the configuration including the terminals, the other surface side of the disk can be brought closer to the wheel side to achieve a compact configuration. (4) Further, the terminal provided on the disk and the vehicle body side may be always in contact with each other by, for example, a slip ring or the like. However, as in the present embodiment, if the contact portion is not contacted during traveling, the connecting portion will not be worn. (5) In the first and second embodiments, the secondary coil 30
Is fixed to the wheel 20, but, for example, the secondary coil may be fixed to the vehicle body. More specifically, a configuration may be adopted in which the axle is formed in a cylindrical shape, a fixed shaft extending from the vehicle body is provided therein, and the secondary coil is fixed to the fixed shaft. With this configuration, even when the wheels rotate while the electric vehicle is running, the secondary coil does not rotate integrally with the vehicle body, and the connection between the secondary coil and the charging circuit is facilitated.

[Brief description of the drawings]

FIG. 1 is a perspective view of a charging system for an electric vehicle according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a state where the electric vehicle is parked at a charging position.

FIG. 3 is a front view showing a state where the electric vehicle is parked at a charging position.

FIG. 4 is a sectional view of wheels of an electric vehicle.

FIG. 5 is a perspective view showing an attached state of an annular terminal.

FIG. 6 is a perspective view showing a modified example of an attached state of an annular terminal.

FIG. 7 is a sectional view of wheels of an electric vehicle according to a second embodiment.

FIG. 8 is a side view showing a conventional charging system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Battery 20 ... Wheel 30 ... Secondary coil 42 ... Disk 43 ... Ring terminal 50 ... Terminal displacement device 51 ... Body side terminal 60 ... External power supply 61 ... Rail 70 ... Primary coil 80, 81 ... Intermediate coil

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical indication location H02J 7/00 301 H01F 23/00 B (72) Inventor Kunihiko Watanabe 1 Nishisuehirocho, Yokkaichi-shi, Mie Prefecture No. 14 Sumitomo Wiring Systems Co., Ltd. (72) Inventor Tomohiro Kishi 1-3-3, Shimaya, Konohana-ku, Osaka-shi, Osaka Prefecture Sumitomo Electric Industries, Ltd. 1-3-1 Sumitomo Electric Industries, Ltd. (72) Inventor Akashi Arisaka 1-3-1, Shimaya, Konohana-ku, Osaka-shi, Osaka Sumitomo Electric Industries, Ltd.

Claims (5)

[Claims] 1. A secondary coil provided in a wheel of an electric vehicle is electromagnetically coupled to a primary coil connected to an external charging power source provided in a parking lot, so that the electric power is supplied by the external charging power source. An electric vehicle charging device for charging a power storage device provided on a vehicle body. 2. The secondary coil is attached to the wheel, and a pair of annular terminals connected to the secondary coil and rotating together with the wheel are provided on the same axis of the wheel. The charging device for an electric vehicle according to claim 1, further comprising a pair of vehicle body-side terminals connected to the power storage device and in contact with the pair of annular terminals. 3. A charging device for an electric vehicle according to claim 2, further comprising a terminal displacement mechanism for switching said pair of vehicle body-side terminals to a contact state and a non-contact state with respect to said annular terminal. apparatus. 4. The secondary coil is attached to the wheel, and a pair of intermediate coils is provided between the secondary coil and the power storage device, and one of the intermediate coils rotates toward the wheel. And the other intermediate coil is attached to the vehicle body side so as to be electromagnetically coupled to the one intermediate coil and connected to the power storage device side. Claim 1.
The charging device for an electric vehicle according to claim 1. 5. The vehicle according to claim 1, further comprising a wheel guide provided on the parking lot side for guiding wheels of the electric vehicle to guide a secondary coil and the primary coil of the electric vehicle to an electromagnetic coupling position. The charging device for an electric vehicle according to claim 1.