JPH10106870A - Magnetically coupling equipment for electric motorcar charging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve charging efficiency by joining a primary core and a secondary core without forming a gap. SOLUTION: On the electric motorcar side, a secondary coil unit 20 is arranged in an accepting case 13, which unit is constituted by winding a secondary coil 22 around a secondary core 21. In the accepting case 13, a plate spring 14 is installed in the bottom part. On the high frequency power source equipment side, a primary coil unit 30 is installed which is constituted by winding a primary coil 32 around a primary core 33. When the primary coil unit 30 is inserted in the accepting case 13, the primary coil unit 30 is energized upward by the plate spring 14. Thereby the primary core 33 is joined to the secondary core 21 in the state of close contact. Both of the cores 33, 21 are closely brought into contact with each other without forming a gap, so that magnetic flux loss is prevented and charging efficiency can be improved.

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. 8, this is a configuration including a primary coil unit 1 connected to a power supply for charging and a secondary coil unit 2 disposed 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, if a gap is formed at the joint between the primary core and the secondary core, the loss increases and the efficiency is impaired. Therefore, when the primary coil unit is inserted into the electric vehicle, it is desirable that the primary core and the secondary core be joined as closely as possible.

[0004] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a magnetic coupling device for charging an electric vehicle that can be charged with high efficiency.

[0005]

In order to achieve the above object, a magnetic coupling device for charging an electric vehicle according to claim 1 is for charging a power storage device of an electric vehicle with a charging power supply, and comprises: A primary coil unit formed by winding a primary coil around a core, and a secondary coil unit formed by winding a secondary coil around a secondary core provided in an electric vehicle, and the primary coil unit is disposed on the electric vehicle side. Inserting and joining both the primary and secondary cores forms a closed-loop magnetic circuit, and in this state the primary coil is excited by a charging power supply to generate an electromotive force in the secondary coil and store electricity. In a device for charging a device, a biasing member for biasing at least one of a primary core and a secondary core in a direction in which the primary core and the secondary core are joined to each other when a primary coil unit is inserted into an electric vehicle. Characterized in that are provided.

The magnetic coupling device for charging an electric vehicle according to claim 2 is the magnetic coupling device for charging an electric vehicle according to claim 1, wherein the biasing member is provided in a receiving case into which the primary coil unit is inserted. It is characterized in that the coil unit is urged in a direction in which the primary core and the secondary core are joined to each other.

According to a third aspect of the present invention, there is provided the magnetic coupling device for charging an electric vehicle according to the first aspect, wherein one or both of the primary and secondary coil units have a core displaced with respect to the coil. The coil is fixed, and the core is urged by the urging member in a direction in which the core is joined to the counterpart core.

[0008]

According to the first aspect of the present invention, when the primary coil unit is inserted into the electric vehicle, at least one of the primary core and the secondary core is urged in a direction in which they are joined to each other. Therefore, in a state where the primary coil unit is inserted, the primary core and the secondary core can be brought into close contact with each other, and the occurrence of power loss can be suppressed and the charging efficiency can be increased.

According to the second aspect of the present invention, when the primary coil unit is inserted into the receiving case, the primary coil unit is urged in a direction of joining the primary core and the secondary core to each other. As a result, the primary core and the secondary core can be brought into close contact with each other, and loss can be prevented and charging efficiency can be improved.

According to the third aspect of the invention, when the primary coil unit is inserted into the electric vehicle, one or both cores are urged in a direction in which the cores are joined to the counterpart core. As a result, the primary core and the secondary core can be brought into close contact with each other, and power loss can be prevented and charging efficiency can be increased. In addition, according to the third aspect of the present invention, since only the core is directly urged, the state of close contact between the primary core and the secondary core can be further ensured.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> A first embodiment of the present invention will now be described with reference to FIGS.

The overall configuration of the present system is as shown in FIG. 1, and a receiving portion 12 which can be opened and closed by, for example, a lid 11 is formed outside the body of the 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 opening 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 into an L-shape, and has a shape in which the long side of the L-shape is horizontal. 13, the short side of the L-shape extends downward on the inner side of the recess 13 a, and the lower end thereof penetrates the receiving case 13 to form the recess 13 a
Projects slightly into the interior. 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. further,
A leaf spring 1 is provided at the bottom of the recess 13a of the receiving case 13.
4 is attached, and the primary coil unit 30 inserted into the recess 13a is lifted upward (secondary coil unit 20
Side). This leaf spring 14 corresponds to the biasing member of the present invention.

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 power cable 40, an electromotive force is generated in the secondary coil 22, and based on this, the power battery of the electric vehicle EV is charged.

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. When the primary coil unit 30 is inserted into the recess 13 a of the receiving case 13, the primary coil unit 30 is urged upward by the leaf spring 14 during the insertion process. Then, when the primary coil unit 30 is pushed into the position where it contacts the step 13c and is completely housed in the recess 13a, the lower end surface of the short side of the secondary core 21 is closed through the opening 31a. And the upper end surface of the short side of the primary core 33 contacts the lower end of the long side of the secondary core 21 via the opening 13b. That is, when the primary coil unit 30 is urged upward by the leaf spring 14, the opposing surfaces of the primary core 33 and the secondary core 21 are bonded in a tight contact state. As a result, a closed-loop magnetic circuit is formed by the two cores 21 and 33. When the primary coil 32 is excited through the charging power cable 40, an electromotive force is generated in the secondary coil 22. The power battery of the EV is charged.

As described above, in the present embodiment, the primary coil unit 30 is urged upward by the leaf spring 14, so that the primary core 33 and the secondary core 21 are brought into close contact with no gap, and the magnetic resistance in the magnetic circuit is reduced. The power loss can be suppressed by suppressing the increase in the power consumption, and the charging efficiency can be improved.

<Second Embodiment> FIGS. 5 and 6 show a third embodiment.
2 shows a second embodiment of the present invention that embodies the present invention. In the first embodiment, the primary core 33 is urged by the leaf spring 14 in a direction in which the primary core 33 is joined to the secondary core 21. In the present embodiment, the secondary core 21 is joined to the primary core 33 by the coil spring 51. It is designed to bias in the direction of The other points are the same as those of the first embodiment, and therefore, the same portions are denoted by the same reference numerals and overlapping description will be omitted.

The secondary coil 22 of the second embodiment is wound around the short side of an L-shaped secondary core 21 as in the first embodiment. A slight gap is formed. That is, the secondary core 21 can move up and down with respect to the secondary coil 22. Further, a coil spring 51 is disposed above the vertically movable secondary core 21 between the ceiling core of the receiving case 13 and urges the secondary core 21 downward. The diameter of the coil spring 51 is set to be slightly smaller than the long side of the secondary core 21, and urges the entire long side of the secondary core 21 downward.

The recess 13 in the receiving case 13
The height dimension of “a” is set substantially equal to the thickness dimension at the distal end portion of the housing 31 in the primary coil unit 30 on the back side, and substantially equal to the thickness dimension at the base side of the housing 31 near the entrance. This allows
The primary coil unit 30 is closely inserted into the recess 13a.

The leading edges of the long sides of the primary core 33 and the secondary core 21 are cut out in a tapered shape to form a guide surface 52.
And the opposing secondary core 21 and primary core 3
The short sides 3 are guided by the guide surfaces 52 so as to be easily joined to the upper surface of the leading end of the primary core 33 and the lower surface of the leading end of the secondary core 21.

The primary coil 32 wound around the primary core 33 is formed by winding a conductive pipe 53 whose inner surface is insulated a plurality of times. A coolant supply pipe 54 is fitted to the end of the conductive pipe 53, and a current-carrying terminal 55 is connected, for example, by brazing, to a portion of the conductive pipe 53 near the connection with the coolant supply pipe 54, Here, the core wire of the charging power cable 40 is fixed by caulking so that the primary coil 32 can be excited. Further, the two refrigerant supply pipes 54 extend in an integrated manner 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. Thereby, when the circulation pump is operated, the cooling water is supplied to the charging power cable 4.
0 through the refrigerant supply pipe 54 on the outward path side of the conductive pipe 5
3 flows again through the refrigerant supply pipe 54 on the return path side of the charging power cable 40 and is returned from the radiator to the circulation pump, so that the heat generated in the conductive pipe 53 is cooled. It is carried by water and is radiated in the radiator. Therefore, the primary coil 32 can be effectively cooled.

The present embodiment is configured as described above, and its operation and effects are as follows. When the primary coil unit 30 is inserted into the recess 13 a of the receiving case 13, the short sides of the secondary core 21 and the primary core 33 abut on the guide surfaces 52 of the primary core 33 and the secondary core 21 during the insertion process. . Further, when the primary coil unit 30 is pushed inward, the short sides of the secondary core 21 and the primary core 33 are guided by the guide surface 52, respectively, and the primary coil unit 30 is inserted. It contacts the lower surface of the tip of the next core 21. At this time, the secondary core 21 is lifted upward against the urging force of the coil spring 51. Thereby, the opposing surfaces of the primary core 33 and the secondary core 21 are joined in a close contact state by the elastic force from the coil spring 51,
A closed single loop magnetic circuit is formed (see FIG. 6). When the primary coil 32 is excited through the charging power 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.

As described above, in this embodiment, the coil spring 5
Since the secondary core 21 is urged downward by 1, the primary core 33 and the secondary core 21 are closely contacted with no gap,
By suppressing an increase in the magnetic resistance of the magnetic circuit, power loss can be prevented and charging efficiency can be increased. In addition, since the coil spring 51 is formed to have a diameter slightly smaller than the long side dimension of the secondary core 21 so as to bias the entire secondary core 21, the secondary core 21 is biased in an inclined state. Therefore, the two cores 33 and 21 can be stably joined to each other without contact. In addition, since the secondary core 21 is directly urged, the close contact between the cores 33 and 21 can be ensured.

<Other Embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition to the following, various changes can be made without departing from the scope of the invention. (1) In the second embodiment, the coil spring 51 is formed to be slightly smaller in diameter than the long side dimension of the secondary core 21.
Although 1 is urged, as shown in FIG. 7, two small coil springs 61 may be arranged in front and back to urge the secondary core 21 downward. In this case, since the front and rear sides of the secondary core 21 are evenly urged downward, the secondary core 21 does not become inclined and the cores 33 and 21 are stably brought into close contact with each other. Can be joined. In FIG. 7, the same portions as those of the second embodiment are denoted by the same reference numerals, and description thereof is omitted.

(2) In the first embodiment, the primary coil unit 30 is urged upward by the leaf spring 14 provided at the bottom in the receiving case 13. An urging member may be provided on the bottom surface, and the urging member may urge the primary coil unit 30 upward by extending between the urging member and the inner bottom of the receiving case 13.

(3) In the first embodiment, the leaf spring 14
By urging the primary coil unit 30 upward, the primary core 33 is urged in a direction in which the primary core 33 is joined to the secondary core 21.
On the 0 side, a structure in which an urging member for urging the primary core 33 upward directly in the housing 31 may be provided.

(4) A structure combining the first embodiment and the second embodiment, that is, the primary coil unit 30 is urged upward by the leaf spring 14 and the secondary core 21 is pushed downward by the coil spring 51. You may make it go.

(5) In the second embodiment, the secondary core 21
Is urged toward the primary core 33, but conversely, the primary coil 32 may be fixed within the housing 31 to urge the primary core 33 toward the secondary core 21. Alternatively, the configuration may be such that both cores 33 and 21 are urged.

(6) In the first embodiment, the urging member of the present invention is the leaf spring 14, and in the second embodiment, the coil spring 51 is used. Alternatively, the urging member may be rubber, sponge,
Alternatively, it may be an elastic body such as a rubber bag filled with gas.

[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 according to the first embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of the same.

FIG. 4 is a longitudinal sectional view showing a state where the primary coil unit is inserted.

FIG. 5 is a longitudinal sectional view showing each coil unit in a second embodiment.

FIG. 6 is a longitudinal sectional view showing an inserted state of the primary coil unit.

FIG. 7 is a longitudinal sectional view showing another embodiment.

FIG. 8 is a cross-sectional view illustrating a conventional magnetic coupling device for charging an electric vehicle.

[Explanation of symbols]

 EV ... electric vehicle 13 ... receiving case 14 ... leaf spring (biasing member) 20 ... secondary coil unit 21 ... secondary core 22 ... secondary coil 30 ... primary coil unit 32 ... primary coil 33 ... primary core 51 ... coil spring ( Urging member) 61 ... Coil spring (urging member)

Continuation of the front page (72) Inventor Akashi Arisaka 1-3-1 Shimaya, Konohana-ku, Osaka-shi, Sumitomo Electric Industries, Ltd. (72) Inventor Toshiro Shimada 1-3-1 Shimaya, Konohana-ku, Osaka-shi, Osaka No. Sumitomo Electric Industries, Ltd.

Claims (3)

[Claims] 1. A primary coil unit in which a primary coil is wound around a primary core and a secondary core provided in the electric vehicle, for charging a power storage device of the electric vehicle with a charging power supply. And a secondary coil unit having a secondary coil wound thereon, and 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 this state, 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. An electric biasing member is provided for urging at least one of the primary core and the secondary core in a direction in which the primary core and the secondary core are joined to each other when inserted into an automobile. The magnetic coupling device for vehicle charging. 2. The magnetic coupling device for charging an electric vehicle according to claim 1, wherein the urging member is provided in a receiving case into which the primary coil unit is inserted, and connects the primary coil unit to the primary core. A magnetic coupling device for charging an electric vehicle, wherein the magnetic coupling device is biased in a direction in which the secondary core and the secondary core are joined to each other. 3. The magnetic coupling device for charging an electric vehicle according to claim 1, wherein one or both of the primary and secondary coil units have a core displaceable with respect to the coil, and the coil is fixed. A magnetic coupling device for charging an electric vehicle, wherein the core is urged by the urging member in a direction in which the core is joined to a counterpart core.