JPH05111168A - Battery charger for electric automobile - Google Patents

Abstract

PURPOSE:To eliminate feeding/rewinding work of electric cord by realizing noncontact charging of battery mounted on an electric vehicle. CONSTITUTION:A battery 2 mounted on an electric vehicle 1 is connected through a rectifier 4 with a power receiving side coil 5; and a power supply side coil 6 connected with an AC power supply 8 is disposed such that the coil 6 opposes to the power receiving side coil 5 when the electric automobile 1 parks at a predetermined position in a parking yard 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for charging a battery mounted on an electric vehicle, and more particularly, to a non-contact type charging apparatus, which eliminates the need for attaching and detaching an electric cord. Is.

[0002]

2. Description of the Related Art Since an electric vehicle uses an electric motor or the like as a power source, it is necessary to charge a battery as an energy source. Normally, the battery is charged by a battery mounted on the vehicle and provided outside. This is done by connecting to the power supply via an electric cord or the like.

[0003]

However, since the energy density of a battery mounted on an ordinary electric vehicle is not so high, it is frequently (in proportion to the mileage, but once a day or more frequently). Therefore, as described above, charging via an electric cord is not only labor-intensive, but also causes problems such as fatigue, deterioration, dirt, and tidying of the electric cord, as well as electricity. If the cords are not properly connected, there is a danger of electric leakage, and a general driver may be shunned by an electric vehicle because of annoying, dirty hands, not holding hands, or scary. Also, in applications where the mileage is long, it is desirable to recharge every time you park, but it is very troublesome to connect and disconnect the electric cord each time, and you forget to charge the electric cord, It is conceivable that a mistake such as starting with the vehicle connected will occur.

The present invention has been made by paying attention to the unsolved problems of the prior art as described above, and the work of attaching and detaching the electric cord is unnecessary, and the battery of the electric vehicle can be charged easily and safely. The purpose of the present invention is to provide a charging device.

[0005]

In order to achieve the above object, the present invention is a device for charging a battery mounted in an electric vehicle, wherein the battery is mounted in the electric vehicle and is supplied to the battery via a rectifier. The connected power receiving side coil,
A power feeding side coil provided outside the electric vehicle and facing the power receiving side coil when charging the battery;
An alternating current power supply for supplying an alternating current to the power supply side coil.

[0006]

When the AC power is supplied from the AC power supply to the power supply side coil, the AC current is generated in the power reception side coil by electromagnetic induction, and the AC current is rectified by the rectifier and supplied to the battery to charge the battery. To be done.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a first embodiment of the present invention.
First, the configuration will be described. The electric vehicle 1 has a battery 2
It is a vehicle which uses an electric motor (not shown) as a power source, which is driven by using as an energy source, and a device for charging the battery 2 is formed at a rear portion thereof.

That is, both terminals of the battery 2 are
It is connected to the power receiving side coil 5 wound around the magnetic body 5a via the battery side controller 3 that controls the charging current and the charging amount and the rectifier 4 that converts the alternating current into the direct current. The power receiving side coil 5 is arranged at the rear end of the electric vehicle 1 so that the end of the power receiving side coil 5 faces the lower side of the vehicle.

On the other hand, in the parking lot 10 of the electric vehicle 1, when the electric vehicle 1 is parked at a predetermined parking position, the power feeding side coil 6 facing the power receiving side coil 5 is wound around the magnetic body 6a. It is installed in. Then, the power feeding side coil 6 switches on / off of the power source (if necessary,
It may have a function of converting a power frequency or a power voltage. Is connected to the AC power supply 8 via the power supply side controller 7. The AC power supply 8 may be a general commercial power supply.

Next, the operation of this embodiment will be described. To charge the battery 2 mounted on the electric vehicle 1, after the electric vehicle 1 is parked at a predetermined position in the parking lot 10,
By the manual operation, the controller 7 on the power supply side is turned on to electrically connect the AC power supply 8 and the coil 6 on the power supply side to supply an alternating current to the coil 6 on the power supply side. If a sensor or the like for confirming the parking of the electric vehicle 1 is provided, the power supply side controller 7 can be automatically turned on / off.

When an alternating current is supplied to the power feeding side coil 6, an alternating current is generated in the power receiving side coil 5 facing it by electromagnetic induction, and the alternating current is converted into a direct current by the rectifier 4, and the direct current is converted into a direct current. Current is battery side controller 3
Is supplied to the battery 2 via the
Is charged. Thus, with the configuration of this embodiment,
Since the battery 2 mounted on the electric vehicle 1 is charged by the electromagnetic mutual induction action, the device on the power supply side and the device on the charge side may be in non-contact even during charging.

Therefore, it is not necessary to attach and detach the electric cord, which is cumbersome and may be contaminated in some cases. If the electric cord becomes unnecessary, problems such as leakage due to fatigue and deterioration of the electric cord can be eliminated, and the connector can be removed. The risk of electric leakage due to rainwater is also reduced. Moreover, even if the power supply side controller 7 is not turned off after charging is completed, there is no particular problem temporarily, and a sensor that can detect the presence or absence of the electric vehicle 1 is provided to automatically turn off the power supply side controller 7. It is also easy to adopt the configuration.

Further, since the power feeding side coil 6 and the power receiving side coil 5 act as a transformer, a transformer for converting the voltage to be charged into a required voltage is separately provided by appropriately selecting the number of turns of these coils. No need. 2 and 3 show
It is a figure which shows the principal part of 2nd Example of this invention, FIG. 2 is a top view, FIG. 3 is the sectional view on the AA line of FIG.

Here, in the above embodiment, the power feeding side coil 6 is provided along with the parking position of the electric vehicle 1. However, if the parking position is deviated, charging may be insufficient. In the present embodiment, such a problem is dealt with by making the position of the power feeding side coil 6 variable. That is, the box 20 in which the power feeding side coil 6 is housed is a screw shaft 22 connected to the output shaft of the electric motor 21, and the screw shaft 22 fixed to the lower surface of the box 20.
A feed screw mechanism composed of a nut 23 that is screwed with the guide 23 is linearly movable along the guides 20A and 20B. However, the linear direction of the box 20 is made to coincide with the width direction of the electric vehicle 1.

With such a configuration, the box 20 can be displaced to an arbitrary position in the width direction of the electric vehicle 1 within a range in which it can be moved linearly, so that the electric motor 21 can be moved according to the stop position of the electric vehicle 1. If the electric vehicle 1 is driven to rotate, even if the stop position of the electric vehicle 1 is slightly displaced, the power receiving side coil 5 and the power feeding side coil 6 can be opposed to each other and appropriate charging can be performed.

FIG. 4 is a side view showing an essential part of the third embodiment of the present invention. That is, in this embodiment, the receiving coil is housed in the box 30, and the box 30 is
The screw shaft 32 connected to the output shaft of the electric motor 31 and a feed screw mechanism composed of a nut 33 screwed onto the screw shaft 32 enable the vertical movement.

During normal running, the box 3
0 is accommodated in the position shown by the solid line, and the box 30 is lowered to the position shown by the chain line when charging. With such a configuration, even if the box 20 accommodating the power feeding side coil is buried in the ground, the gap between the boxes 20 and 30 can be made small, so that efficient charging can be performed.

In this embodiment as well, the box 20 may be movable as shown in the second embodiment.
FIG. 5 is a side view showing the main part of the fourth embodiment of the present invention. That is, in this embodiment, the power receiving side coil 5 is housed in the rear bumper of the electric vehicle 1 so as to face the rear of the vehicle, and the box 20 housing the power feeding side coil 6 is arranged on the wall surface 10a of the parking lot 10. The box 20 is movable in the vehicle width direction or in the direction projecting from the wall surface 10a by the same configuration as the second embodiment or the third embodiment.

Even with such a configuration, the charging can be performed in a non-contact state, and the gap between the power receiving side coil 5 and the power feeding side coil 6 can be reduced to perform efficient charging. .. In addition, in each of the above-described embodiments, the power feeding side coil 6 is fixed at a predetermined position or installed so as to be movable within a predetermined range. However, for example, the box 20 accommodating the power feeding side coil 6 can be freely moved. The box 2 is attached to the surface of the electric vehicle 1 on which the power receiving coil 5 is housed.
By applying 0, the coils 5 and 6 may be opposed to each other to perform charging.

In each of the above embodiments, the case where charging is performed in the parking lot has been described. For example, if the power supply side device is provided on a normal road surface or shoulder, charging is performed when the vehicle is stopped. It also becomes possible.

[0021]

As described above, according to the present invention,
Since the charging is performed by the electromagnetic mutual induction action, the device on the power supply side and the device on the charging side can be charged in a non-contact state, and therefore it is bothersome and sometimes dirty. There is no need to attach or detach the electric cord, and if the electric cord is no longer needed, there will be no problems such as leaks due to fatigue or deterioration of the electric cord, and the effect of reducing the risk of disconnection of the connector or electric leakage due to rainwater. is there.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a plan view showing a main part of a second embodiment of the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a side view showing a main part of a third embodiment of the present invention.

FIG. 5 is a side view showing a main part of a fourth embodiment of the present invention.

[Explanation of symbols]

 1 Electric Vehicle 2 Battery 4 Rectifier 5 Power Receiving Side Coil 6 Power Supply Side Coil 8 AC Power Supply

Claims (1)

[Claims] 1. A device for charging a battery mounted on an electric vehicle, comprising: a power receiving side coil mounted on the electric vehicle and connected to the battery via a rectifier;
A power feeding side coil provided outside the electric vehicle and facing the power receiving side coil when charging the battery;
A battery charging device for an electric vehicle, comprising: an AC power supply that supplies an AC current to the power feeding side coil.