RECHARGEABLE BATTERY, CHARGING SYSTEM, AND ELECTRONIC DEVICE

• US 20160049698A1
• Filed: 10/29/2015
• Published: 02/18/2016
• Est. Priority Date: 05/10/2013
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: KAWANO, Hiroyasu, UCHIDA, Akiyoshi, SHIMOKAWA, Satoshi, MATSUI, Kiyoto, OZAKI, Kazuyuki, TAGUCHI, Masakazu
• Granted Patent: US 10,276,900 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 50/107 having curved cross-section, e.g. round or elliptic H01M50/103, H01M50/109, H01M50/11 take precedence
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A rechargeable battery includes: a battery body including a cylindrical outer peripheral side surface; and a power receiving coil wound in at most a single layer around the outer peripheral side surface, and electrically connected to the battery body. The power receiving coil is helically wound around the outer peripheral side surface while forming a space from which the outer peripheral side surface is exposed.

Claims

1. A rechargeable battery comprising:

a battery body including a cylindrical outer peripheral side surface; and

a power receiving coil wound in at most a single layer around the outer peripheral side surface, and electrically connected to the battery body, wherein

the power receiving coil is helically wound around the outer peripheral side surface while forming a space from which the outer peripheral side surface is exposed.

2. The rechargeable battery according to claim 1, wherein the number of turns of the power receiving coil is equal to 1.5.

3. The rechargeable battery according to claim 1, wherein a ratio of a length in a longitudinal direction of the battery body to a diameter of the battery body is equal to or above 3.5.

4. The rechargeable battery according to claim 1, wherein a first pitch corresponding to one round of the power receiving coil is greater than a second pitch corresponding to a half round of the power receiving coil.

5. The rechargeable battery according to claim 1, wherein the power receiving coil includes a first end portion and a second end portion, and the rechargeable battery further comprises:

a conducting wire provided on the outer peripheral side surface, extending in a longitudinal direction of the battery body, and electrically connecting the first end portion and the second end portion.

6. The rechargeable battery according to claim 1, wherein

among a plurality of eye directions to see through the battery body, there exists a first direction in which the conducting wire and a portion of the power receiving coil hidden behind the battery body do not cross each other.

7. The rechargeable battery according to claim 6, further comprising:

a casing to house the battery body and the power receiving coil, wherein

the casing includes a flat surface provided orthogonally to the first direction.

8. The rechargeable battery according to claim 6, further comprising:

a cylindrical casing to house the battery body and the power receiving coil, wherein

a center axis of the battery body is displaced from a center axis of the casing to the first direction.

9. The rechargeable battery according to claim 6, further comprising:

a plurality of weights, wherein

when the first direction is oriented vertically downward, a sum of gravitational moments, acting on the weights, about a center axis of the battery body becomes equal to 0.

10. The rechargeable battery according to claim 1, wherein

the battery body includes:

a tube made of metal; and

a magnetic sheet surrounding the tube, wherein

a surface of the magnetic sheet is the outer peripheral side surface.

11. The rechargeable battery according to claim 1, further comprising:

a resonance coil provided on the outer peripheral side surface along the power receiving coil; and

a rectifier circuit provided between the battery body and the power receiving coil, and configured to pass a current flowing in the power receiving coil in one direction, wherein

the rectifier circuit includes only one diode with a forward direction of the one diode being aligned with the one direction.

12. The rechargeable battery according to claim 1, further comprising:

a capacitor provided between the battery body and the power receiving coil, and configured to form an LC resonance circuit in conjunction with the power receiving circuit.

13. A charging system comprising:

a power transmitting coil wound around a first axis;

a battery body including a cylindrical outer peripheral side surface, and defining a second axis as a longitudinal direction of the battery body; and

a power receiving coil wound in at most a single layer around the outer peripheral side surface, and electrically connected to the battery body, wherein

the second axis is perpendicular to the first axis, and

the power receiving coil is helically wound around the outer peripheral side surface while forming a space from which the outer peripheral side surface is exposed.

14. An electronic device comprising:

a rechargeable battery including

a battery body including a cylindrical outer peripheral side surface, and

a power receiving coil wound in at most a single layer around the outer peripheral side surface, and electrically connected to the battery body, wherein

the power receiving coil is helically wound around the outer peripheral side surface while forming a space from which the outer peripheral side surface is exposed.

15. The electronic device according to claim 14, wherein the power receiving coil includes a first end portion and a second end portion, and

the rechargeable battery further includes

a conducting wire provided on the outer peripheral side surface, extending in a longitudinal direction of the battery body, and electrically connecting the first end portion and the second end portion.

16. The electronic device according to claim 15, wherein

among a plurality of eye directions to see through the battery body, there exists a first direction in which the conducting wire and a portion of the power receiving coil hidden behind the battery body do not cross each other.

17. The electronic device according to claim 16, further comprising:

a housing in which the rechargeable battery is housed, wherein

the housing includes a flat surface provided orthogonally to the first direction.

18. The electronic device according to claim 16, further comprising:

a cylindrical housing in which the rechargeable battery is housed, wherein

a center axis of the battery body is displaced from a center axis of the housing to the first direction.

19. The electronic device according to claim 16, further comprising:

a plurality of weights, wherein

when the first direction is oriented vertically downward, a sum of gravitational moments about a center axis of a housing acting on the weights becomes equal to 0.