Charging connector for electric vehicle

• US 5,909,100 A
• Filed: 08/08/1997
• Issued: 06/01/1999
• Est. Priority Date: 08/09/1996
• Status: Expired due to Fees

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation), Sumitomo Wiring Systems Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation), Sumitomo Wiring Systems Limited (Sumitomo Corporation)
• Inventors: Watanabe, Kunihiko, Kuki, Heiji, Arisaka, Shuji, Shimada, Toshiro
• Primary Examiner(s): Wong, Peter S.
• Assistant Examiner(s): SHIN, KYUNG E
• Application Number:
  US08/908,620
• Time in Patent Office: 662 Days
• Field of Search: 320/108, 320/109, 336/66
• US Class Current: 320/108
• CPC Class Codes: B60L 2270/32 of electricity
• CPC Class Codes: B60L 2270/34 of parts
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: B60L 53/34 Plug-like or socket-like devices specially adapted for contactless inductive charging of electric vehicles positioning means for charging devices using inductive energy transfer B60L53/38
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01R 13/6205 Two-part coupling devices held in engagement by a magnet
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

Groups of magnets are respectively provided on the joint surfaces of a vehicle-side connector and a power-supply-side connector in such a way that the N and S poles of a plurality of permanent magnets are alternately arranged in a circle. When charging is carried out, the magnetic attraction generated by placing the heteropolar magnets in both groups of magnets opposite to one another is utilized for bringing the vehicle-side connector and the power-supply-side connector into engagement with each other. After the charging, the group of magnets of the power-supply-side connector are turned by one pitch to place the homopolar magnets in both groups of magnets opposite to one another, whereby both connectors are easily separated from each other because of the magnetic repulsive force generated therebetween.

Claims

1. A charging connector for an electric vehicle being connectable to another connector so as to charge a storage battery of the electric vehicle, comprising:

a magnet that is magnetically attracted to a magnetic material disposed on the other connector, the magnet located relative to a power exchange portion of the charging connector such that the magnetic force generated between the magnet and the magnetic material is utilized for bringing the charging connector and the other connector into engagement with each other such that the power exchange portion of the charging connector is coupled to a power exchange portion of the other connector whereby charging can be performed.

2. A charging connector for an electric vehicle as recited in claim 1, wherein the magnet is an electromagnet whose magnetic force is changeable and wherein the charging connector is made detachable from the other connector by gradually releasing the magnetic force applied between the magnet and the magnetic material to bring the connectors into engagement with each other.

3. A charging connector for an electric vehicle as recited in claim 2, wherein the charging connector has a plurality of magnets arranged in a predetermined position on a first side of the charging connector that faces the other connector and wherein the magnetic force is gradually released beginning from the magnets in a region closer to one end of the first side of the charging connector and proceeding to the magnets in another region closer to another end of the first side of the charging connector, whereby the charging connector is made detachable from the other connector.

14. A charging connector for an electric vehicle as recited in claim 1, wherein detachment of the charging connector from the other connector is facilitated by an engagement releasing unit.

4. A charging device for an electric vehicle comprising:

a vehicle-side connector which is connectable to a storage battery mounted in a vehicle body and is mountable on the vehicle body; and

a power-supply-side connector which is connectable to a power supply for supplying charging electric power,

wherein respective groups of magnets are provided on respective facing sides of the vehicle-side connector and the power-supply-side connector in such a way that the N and S poles of a plurality of magnets are alternately arranged in a circle;

the magnetic attraction generated by placing opposite poles of the magnets in the respective groups of magnets opposite to one another is utilized for bringing the vehicle-side connector and the power-supply-side connector into engagement with each other; and

the magnetic repulsive force generated by placing like poles of the magnets in the respective groups of magnets opposite to one another is utilized for detaching the power-supply-side connector from the vehicle-side connector.

5. A charging device for an electric vehicle as recited in claim 4, wherein in both groups of magnets, said plurality of magnets are arranged with an equal-angle pitch.

6. A charging device for an electric vehicle as recited in claim 4, further comprising:

a positioning systems for regulating a floating of the vehicle-side connector and the power-supply-side connector in a direction along the facing sides.

7. A charging device for an electric vehicle as recited in claim 6, wherein the group of magnets of one of the vehicle-side connector and power-supply-side connector are fixedly mounted thereon, whereas the group of magnets of the other connector are rotatably mounted on said facing side thereof, whereby at a time of engagement, after positioning the vehicle-side connector and the power-supply-side connector by the positioning system, the group of magnets of the other connector is rotated so as to place opposite poles of the magnets in the respective groups of magnets opposite to one another.

8. A charging connector for an electric vehicle as recited in claim 7, wherein the group of magnets of the other connector is rotatably supported on the other connector by a bearing.

9. A charging connector for an electric vehicle as recited in claim 7, further comprising:

an engagement releasing unit for releasing the engagement between the vehicle-side connector and the power-supply-side connector, the engagement releasing unit rotating the group of magnets rotatable on the facing side so as to place like poles of the magnets in the respective groups of magnets opposite to one another.

10. A magnetic coupling apparatus for charging a power battery of an electric vehicle by an external charging power supply, comprising:

a primary core with a primary coil which is wound on the primary core, coupled to the external charging power supply, and

a secondary core, having joint surfaces provided on a same plane, coupled to the power battery, a secondary coil being wound on the secondary core, said primary and secondary cores being jointable to one another so as to constitute a closed loop magnetic circuit,

wherein the secondary core is accommodated in a recess so formed as to have an open portion in the exterior of the electric vehicle, and the joint surfaces of the secondary core jointing the primary core face the open portion side of the recess.

11. A charging device for an electric vehicle, comprising:

a first connector having a magnetic material, and

a second connector being connectable with the first connector, and having a magnet that is magnetically attracted to the magnetic material and located relative to a power exchange portion of the charging connector such that a magnetic force generated between the magnet and the magnetic material is utilized for bringing the first and second connectors into engagement with each other such that the power exchange portion of the charging connector is coupled to a power exchange portion of the other connector whereby charging can be performed.

12. A charging device for an electric vehicle as recited in claim 11, wherein the magnet is an electromagnet whose magnetic force is changeable and wherein the second connector is made detachable from the first connector by gradually releasing the magnetic force applied between the magnet and the magnetic material to bring the connectors into engagement with each other.

13. A charging device for an electric vehicle as recited in claim 12, wherein the second connector has a plurality of connector holding magnets, the connector holding magnets are arranged in the predetermined position of one side facing the first connector and wherein the magnetic force is gradually released from the connector holding magnets in a region closer to one part of the side facing the first connector to the connector holding magnets in the other region so that the second connector is made detachable from the first connector.

15. A charging device for an electric vehicle as recited in claim 11, wherein detachment of the first connector from the second connector is facilitated by an engagement releasing unit.