JPH10108374A - Electric vehicle charging magnetic coupling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a gap from increasing at the coupling part of a magnetic circuit due to contamination of the coupled surface of primary and secondary cores by forming a cleaning member for cleaning the coupled surface of mated core at the time of inserting a primary coil unit into a primary or secondary coil unit. SOLUTION: A total of four cleaning members 60, which are constituted so that respective cleaning heads 62 made of felt, for example, may be fitted onto the upper end of a base part 61 and fitted at the top of respective longer sides and shorter sides of a primary core 33 and the secondary core 21 respectively. The upper end part of the cleaning head 62 is set so that its height is capable of coming into contact with mated cores 21, 33 when a primary coil unit 30, is inserted, and while the primary coil unit 30 is being inserted, both of the cleaning heads 62 slide the coupled surface of the mated cores 21, 33. The coupled surfaces of respective cores 21, 33 are brought into close contact with each other, thus it is possible to come into contact with them with a minimum gap for reduction in magnetic resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic coupling device for an electric vehicle for charging an electric vehicle using electromagnetic induction.

[0002]

2. Description of the Related Art In recent years, non-contact type charging systems utilizing electromagnetic induction have been developed as charging systems for electric vehicles.
One example is disclosed in JP-A-6-14470. As shown in FIG. 6, this is a configuration including a primary coil unit 1 connected to a power supply for charging and a secondary coil unit 2 arranged on the vehicle body side of the electric vehicle. 1 is inserted into the vehicle body so that the primary core 3 and the secondary core 4 are joined to form a single magnetic circuit.
To generate an electromotive force in the secondary coil 6 in a non-contact manner.

[0003]

However, in the above structure, since the joint surface of the core 3 of the primary coil unit 1 is exposed, dirt easily adheres to the joint surface, which increases the gap at the joint of the magnetic circuit. , There is a problem that the cleaning is troublesome.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent a gap at a joint portion of a magnetic circuit from increasing due to contamination of a joint surface between a primary core and a secondary core. is there.

[0005]

The invention according to claim 1 comprises a primary coil unit having a primary core and a primary coil, and a secondary core and a secondary coil provided in an electric vehicle. And a secondary coil unit,
The primary coil unit is inserted into the electric vehicle and the primary and secondary cores are joined to form a closed-loop magnetic circuit. In this state, the primary coil is excited by a charging power supply, and the secondary coil is excited. Wherein the primary or secondary coil unit is provided with a wiping member for wiping the joint surface of the mating core when the primary coil unit is inserted. However, it has features. With this configuration, when the primary coil unit is inserted into the electric vehicle, the wiping member wipes the mating surface of the mating core in the process, and the dirt on the mating surface is automatically removed each time the charging operation is performed. You. As a result, it is possible to prevent a gap from being increased due to contamination and to prevent a change in magnetic characteristics of the magnetic circuit.

The invention of claim 2 is characterized in that the wiping member is provided at a position for wiping the joint surface of the mating core prior to joining the two cores. This way,
Prior to joining the two cores, it is reasonable that the joining surface of the cores is cleaned every time.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

The overall configuration of the system is as shown in FIG. 1. A receiving portion 12 which can be opened and closed by, for example, a lid 11 is formed outside the body of an electric vehicle EV. It can be inserted and set. A charging power cable 40 is connected to the primary coil unit 30, and the charging power cable 40 is connected to the high-frequency power supply device 5 for charging.
It is linked to 0.

As shown in FIG. 2 and subsequent figures, the receiving portion 12 of the electric vehicle EV has a concave portion 13 that opens outward.
The receiving case 13 which constitutes a is attached, and the secondary coil unit 20 is arranged here. The secondary coil unit 20 includes, for example, a secondary core 21 made of ferrite.
The output terminal of the secondary coil 22 is connected to a charging circuit for charging a power battery (not shown) that is a power storage device of the electric vehicle EV. Thus, the high-frequency electromotive force induced in the secondary coil 22 can be rectified to charge the power battery. As shown in FIGS. 2 and 3, the secondary core 21 has, for example, a shape in which a quadrangular prism is bent in an L shape, and is fixed to the receiving case 13 in a shape in which the long side of the L shape is horizontal. The short side of the L-shape extends downward on the deep side of the recess 13a, and its lower end portion penetrates through the receiving case 13 and slightly projects into the recess 13a. Further, the lower surface at the tip of the long side of the L-shape is exposed toward the inside of the recess 13 a through an opening 13 b formed on the open end side of the receiving case 13. A leaf spring 14 is attached to the bottom of the recess 13a of the receiving case 13, and the primary coil unit 30 inserted into the recess 13a is attached.
Is urged upward (to the secondary coil unit 20 side).

On the other hand, the primary coil unit 30 comprises a flat box-shaped housing 31 and a primary coil 32 and a primary core 3.
3 are accommodated. The primary core 33 is the same as the secondary core 21 and is fixed to the housing 31 in such a shape that the long side of the L-shape extends along the front-rear direction of the housing 31. A secondary coil 32 is wound around the base 31 and extends upward at the base side thereof. Further, the upper end surface of the L-shaped short side portion penetrates the housing 31 and protrudes to the outside, and the upper end surface of the L-shaped long side portion is exposed to the outside through an opening 31 a formed at the front end of the housing 31. . Therefore, this primary coil unit 3
0 along the longitudinal direction of the primary core 33 to the electric vehicle EV.
When the primary core 33 is inserted into the recess 13a of the receiving case 13, the upper surface of the leading end of the long side of the primary core 33 slides against the lower end of the short side of the secondary core 21 to be in an opposed state. The upper surface of the side portion also faces the lower surface of the distal end of the long side portion of the secondary core 21 while sliding. When the primary coil unit 30 is inserted to the innermost position where it comes into contact with the step 13c in the receiving case 13 (see FIG. 4), the recess 1 is formed.
When the leaf spring 14 provided on the bottom surface of the core 3a urges the primary coil unit 30 upward, the opposing surfaces of the cores 21 and 33 are almost in contact with each other. A magnetic circuit is formed. Then, when the primary coil 32 is excited through the charging cable 40, an electromotive force is generated in the secondary coil 22, and the power battery of the electric vehicle EV is charged based on the electromotive force.

The wiping member 60 is provided at the upper end of the base 61 with a cleaning head 62 made of, for example, felt.
Are attached to each of the long sides and the short sides of the primary core 33 and the secondary core 21, and a total of four are provided. The upper end of each cleaning head 62 is set to a height that can contact the cores 21 and 33 on the other side when the primary coil unit 30 is inserted, and the primary coil unit 30 is inserted from the state shown in FIG. In the process of insertion, both cleaning heads 62 rub the joint surfaces of the cores 21 and 33 on the other side as shown in FIG.

The opening 13b of the receiving case 13 for receiving the short side end surfaces of the cores 21 and 33 and the housing 3 are provided.
The one opening 31a is formed large so as to be able to receive each end face, but is particularly set to be sufficiently longer than each end face in the insertion direction of the primary coil unit 30. The charging power cable 40 is connected to the housing 3.
1 is inserted into the housing 31 through a tubular portion 38 also serving as a handle, which is integrally provided on the base side of the housing 1, and is connected to the internal primary coil 32.

The present embodiment has the above configuration, and its operation and effects are as follows. (1) According to this embodiment, the primary coil unit 30
Each time is inserted, the joining surface of each of the cores 21 and 33 is rubbed by the cleaning head 62 of the wiping member 60 in the process to remove dirt. As a result, the joint surfaces of the cores 21 and 33 can be in close contact with each other and contact with a minimum gap,
The magnetic resistance can be reduced. (2) In the process of inserting the primary coil unit 30 into the receiving case 13, the joining surface of the primary core 33 slides with respect to the joining surface of the secondary core 21, so that the opposed state is reached. Therefore, even if the insertion depth of the primary coil unit 30 is insufficient and the position of the joining surface of the primary core 33 is shifted back and forth with respect to the insertion direction from the designed position, the “displacement” is caused by the gap in the joining surface. It does not affect the size of the joint surface at all, it only appears as a slight change in the effective area of the joint surface, and the error in the insertion depth is immediately different from the conventional joint surface facing type in which the gap immediately appears as the size of the gap. Very few. Moreover, in the present embodiment, in particular, the receiving case 13 and the openings 13b, 31 of the housing 31 are provided.
The dimension of a in the insertion direction is longer than the dimension of each end face of the cores 21 and 33 in the same direction. Therefore, even if there is some deviation in the insertion direction, the entire area of each end face is always the same as that of the mating core. As a result, the allowable range for displacement in the insertion direction is sufficiently large. (3) In the present embodiment, the primary core 33 is formed in an L shape, and the insertion direction of the primary coil unit 30 is set to be along the longitudinal direction of the primary core 33. The projected area in the insertion direction of the secondary coil unit 20 can be reduced. This means that the area of the receiving portion 12 provided on the electric vehicle EV for receiving the primary coil unit 30 on the surface of the vehicle body is reduced. Will be higher.

<Other Embodiments>

The present invention is not limited to the embodiments described with reference to the above description and the drawings. For example, the following embodiments are also included in the technical scope of the present invention. Various changes can be made without departing from the scope of the present invention.

(1) In the above embodiment, the opening 31a provided in the housing 31 of the primary coil unit 30 and the opening 13b of the receiving case 13 on the electric vehicle EV side remain open. In addition, a shutter for closing the opening may be provided. Accordingly, it is possible to prevent foreign matter from adhering to the joint surface of each core, and it is possible to suppress an increase in the magnetic gap at the joint.

(2) In the above embodiment, each of the primary and secondary coils 22, 32 is formed by winding a normal magnet wire. Utilizing the effect that the center portion of the coil cross section hardly functions as a current path due to the effect, the coils 22 and 32 are formed by, for example, hollow conductive pipes in all embodiments, and cooling water or A configuration in which a coolant such as oil flows is also possible.

Specifically, for example, a configuration shown in FIG. 5 can be considered. Here, the primary coil unit 30 is formed by winding a primary coil 32 around a primary core 33 similar to that of the first embodiment, and the primary coil 32 is formed by winding a conductive pipe 70 whose inner surface is insulated a plurality of times. It consists of.
A refrigerant supply pipe 7 is connected to the end of the conductive pipe 70.
1 is fitted, and an energizing terminal 72 is connected, for example, by brazing near the connection portion of the conductive pipe 70 with the refrigerant supply pipe 71, and the core of the charging power cable 40 is fixed by caulking here. Thus, the primary coil 32 can be excited. Further, the two refrigerant supply pipes 71 extend so as to be integrated along the charging power cable 40, and their ends are connected to a circulating pump (not shown) and a radiator so as to form a closed loop. ing.

Therefore, when the circulation pump is operated, the cooling water flows through the conductive pipe 70 through the refrigerant supply pipe 71 on the outgoing side of the charging cable 40, and this flows again through the refrigerant supply pipe 71 on the backward path of the charging power cable 40. A circulating flow of the refrigerant is generated that is returned from the radiator to the circulating pump.
It is carried by the cooling water and is radiated by the radiator. Thereby, the primary coil 32 can be cooled effectively,
Moreover, since the high frequency current originally has a property that the current flows to the outer peripheral side of the conductive pipe 70 due to the skin effect,
Even if the conductive pipe 70 is hollow, the conductor resistance does not increase. The secondary coil 22 may also be constituted by the conductive pipe 70 and cooled by flowing cooling water. (3) In the above embodiment, the wiping member is provided on both the primary and secondary coil units, but may be provided on at least one of them.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a charging system of the present invention.

FIG. 2 is a perspective view showing primary and secondary coil units showing the first embodiment of the present invention.

FIG. 3 is a vertical sectional view

FIG. 4 is a longitudinal sectional view showing a process of inserting the primary coil unit.

FIG. 5 is a cross-sectional view showing primary and secondary coil units according to another embodiment.

FIG. 6 is a sectional view showing a conventional magnetic coupling device for charging an electric vehicle.

[Explanation of symbols]

 EV electric vehicle 12 receiving part 20 secondary coil unit 21 secondary core 22 secondary coil 30 primary coil unit 32 secondary coil 33 secondary core 60 wiping member

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akashi Arisaka 1-3-1 Shimaya, Konohana-ku, Osaka-shi, Osaka Sumitomo Electric Industries, Ltd. (72) Inventor Toshiro Shimada 1-chome, Shimaya, Konohana-ku, Osaka-shi, Osaka 1-3 No. Sumitomo Electric Industries, Ltd.

Claims (2)

[Claims] 1. A primary coil unit comprising a primary core and a primary coil, wherein the primary coil unit comprises a primary core and a primary coil, and a secondary core and a secondary core provided in the electric vehicle. And a secondary coil unit comprising a secondary coil, wherein the primary coil unit is inserted into the electric vehicle side and the primary and secondary cores are joined to form a closed-loop magnetic circuit. In the state in which the primary coil is excited by the charging power supply to generate an electromotive force in the secondary coil to charge the power storage device, the primary or secondary coil unit includes: A magnetic coupling device for charging an electric vehicle, comprising a wiping member for wiping a joint surface of a mating core when a primary coil unit is inserted. 2. The magnetic coupling device for charging an electric vehicle according to claim 1, wherein the wiping member is provided at a position where the wiping member wipes a bonding surface of a front mating core prior to bonding of both cores.