Electric machine and power supply system having battery pack

• US 9,114,717 B2
• Filed: 10/13/2010
• Issued: 08/25/2015
• Est. Priority Date: 10/14/2009
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Yamamoto, Hiroshi, Kanno, Hiroshi
• Primary Examiner(s): Berhanu, Samuel
• Application Number:
  US12/903,592
• Publication Number:
  US 20110084658A1
• Time in Patent Office: 1,777 Days
• Field of Search: 320/108
• US Class Current: 1/1
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 5/005 without mechanical contact between the collector and the power supply line
• CPC Class Codes: B60L 53/11 DC charging controlled by the charging station, e.g. mode 4
• CPC Class Codes: B60L 53/122 Circuits or methods for driving the primary coil, e.g. supplying electric power to the coil
• CPC Class Codes: B60L 53/80 Exchanging energy storage elements, e.g. removable batteries
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: B60M 7/003 for vehicles using stored power (e.g. charging stations)
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H02J 50/005 Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/342 The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging with circuits for polarity protection H02J7/0034
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 80/10 Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
• 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
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

A battery pack includes a first receiving antenna including a first inductor and a first capacitor for receiving electric power from a first resonant magnetic field generated by a power supply source, at least one secondary battery charged by the electric power received by the first receiving antenna, an oscillator for producing radio-frequency power by DC power discharged from the secondary battery, and a transferring antenna including a second inductor and a second capacitor for generating a second resonant magnetic field from the radio-frequency power. A primary surface of the first inductor is parallel to a first plane of the battery pack, and a primary surface of the second inductor is parallel to a second plane of the battery pack. The second plane intersects with the first plane at an angle of a range of between 45° and 90° including 45° and 90°.

Claims

1. A battery pack for use in an electric machine, the battery pack comprising:

a first receiving antenna including a first inductor and a first capacitor for receiving electric power from a power supply source located outside the electric machine by coupling with a first resonant magnetic field generated by the power supply source;

at least one secondary battery charged by the electric power received by the first receiving antenna;

an oscillator for producing radio-frequency power by DC power discharged from the secondary battery; and

a transferring antenna including a second inductor and a second capacitor for generating a second resonant magnetic field by the radio-frequency power;

wherein

a primary surface of the first inductor included in the first receiving antenna is located within the battery pack and is parallel to a first plane of the battery pack, and

a primary surface of the second inductor included in the transferring antenna is located within the battery pack and is parallel to a second plane of the battery pack,

wherein the second plane facing the second inductor intersects with the first plane facing the first inductor at an angle of a range of between 45° and

90°

including 45° and

90°

.

2. The battery pack according to claim 1, wherein:

the first inductor and the second inductor are each formed by at least one conductive layer having a spiral shape or a loop shape.

3. The battery pack according to claim 1, wherein the first plane and the second plane are orthogonal to each other.

4. The battery pack according to claim 1, wherein when the battery pack is mounted on the electric machine, an energy transfer section is mounted on the electric machine, the energy transfer section receiving an electric energy from the battery pack, the second inductor included in the battery pack facing to a third inductor included in the energy transfer section.

5. The battery pack according to claim 4, Wherein a middle point of a line segment extending between a center of the second inductor as vertically projected onto the first plane and a center of the third inductor as vertically projected onto the first plane is located within an area defined by the primary surface of the first inductor as vertically projected onto the first plane.

6. The battery pack according to claim 5, wherein LS<

0.3×

L1 is satisfied, where

L1 denotes a length of the primary surface of the first inductor extending in the direction vertical to the primary surface of the second inductor, and

LS denotes a distance from the middle point of the line segment to a center of the first inductor as vertically projected onto the first plane.

7. The battery pack according to claim 1, wherein a resonant frequency of the first receiving antenna is different from a resonant frequency of the transferring antenna.

8. An electric machine comprising:

a driving electric motor;

the battery pack for supplying electric power to the driving electric motor according to claim 1; and

an energy transfer section for transferring an electric energy output from the battery pack to the driving electric motor, wherein

the energy transfer section includes a second receiving antenna that couples with the second resonant magnetic field generated by the transferring antenna, and the energy transfer section transfers the radio-frequency power received by the second receiving antenna to the driving electric motor.

9. The electric machine according to claim 8, wherein:

the first inductor and the second inductor are each formed by at least one conductive layer having a spiral shape or a loop shape.

10. The electric machine according to claim 8, wherein the first plane and the second plane are orthogonal to each other.

11. The electric machine according to claim 8, wherein a middle point of a line segment extending between a center of the second inductor as vertically projected onto the first plane and a center of the third inductor as vertically projected onto the first plane is located within an area defined by the primary surface of the first inductor as vertically projected onto the first plane.

12. The electric machine according to claim 11, wherein LS<

0.3×

L1 is satisfied, where

L1 denotes a length of the primary surface of the first inductor extending in the direction vertical to the primary surface of the second inductor, and

LS denotes a distance from the middle point of the line segment to a center of the first inductor as vertically projected onto the first plane.

13. The electric machine according to claim 8, wherein a resonant frequency of the first receiving antenna is different from a resonant frequency of the transferring antenna.

14. The electric machine according to claim 8, wherein the battery pack is attachable to and detachable from the electric machine.

15. An electric vehicle comprising:

a plurality of wheels;

a driving electric motor;

the battery pack for supplying electric power to the driving electric motor according to claim 1; and

an energy transfer section for transferring an electric energy output from the battery pack to the driving electric motor, wherein

the energy transfer section includes a second receiving antenna that couples with the second resonant magnetic field generated by the transferring antenna, and transfers the radio-frequency power received by the second receiving antenna to the driving electric motor.

16. The electric vehicle according to claim 15, wherein:

the first inductor and the second inductor are each formed by at least one conductive layer having a spiral shape or a loop shape.

17. The electric vehicle according to claim 15, wherein the first plane and the second plane are orthogonal to each other.

18. The electric vehicle according to claim 15, wherein a middle point of a line segment extending between a center of the second inductor as vertically projected onto the first plane and a center of the third inductor as vertically projected onto the first plane is located within an area defined by the primary surface of the first inductor as vertically projected onto the first plane.

19. The electric vehicle according to claim 17, wherein LS<

0.3×

L1 is satisfied, where

L1 denotes a length of the primary surface of the first inductor extending in the direction vertical to the primary surface of the second inductor, and

LS denotes a distance from the middle point of the line segment to a center of the first inductor as vertically projected onto the first plane.

20. The electric vehicle according to claim 15, wherein a resonant frequency of the first receiving antenna is different from a resonant frequency of the transferring antenna.

21. The electric vehicle according to claim 15, wherein the battery pack is attachable to and detachable from the electric vehicle.

22. The battery pack according to claim 1, wherein the first inductor and the second inductor are planar coils.