WIRELESSLY RECHARGEABLE BATTERY AND COMPONENTS THEREOF

• US 20180358815A1
• Filed: 08/21/2018
• Published: 12/13/2018
• Est. Priority Date: 09/29/2011
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Li, Hao, Ren, Saining, Qin, Aijun
• Granted Patent: US 10,461,543 B2
• Time in Patent Office: Days
• CPC Class Codes: H01F 2003/005 Magnetic cores for receiving several windings with perpendicular axes, e.g. for antennae or inductive power transfer
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H01M 50/213 adapted for cells having curved cross-section, e.g. round or elliptic H01M50/209, H01M50/216 take precedence
• CPC Class Codes: H02J 50/10 using inductive coupling
• 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 receiver coil assembly for a wirelessly rechargeable battery including first and second transverse coils and a third coil encompassing the first and second coils. The receiver coil may be employed in a power receiver of a wirelessly rechargeable battery. Also disclosed is a wirelessly rechargeable battery having a power receiver demountable from an electrochemical cell.

Claims

1. A coil assembly for charging a battery including:

a. first and second receiver coils having magnetic axes oriented transverse to one another;

b. a third receiver coil having a magnetic axis transverse to the magnetic axes of the first and second receiver coils; and

c. a cylindrical casing having a base and a side wall,

wherein at least one of the first, second and third receiver coils is configured to couple to a transmitter coil when the side wall is oriented perpendicular to a magnetic axis of the transmitter coil.

2. A coil assembly as claimed in claim 1 wherein the third coil is a substantially annular coil.

3. A coil assembly as claimed in claim 1 wherein the first and second coils are arranged in a cross.

4. A coil assembly as claimed in claim 1 including ferrite core material located within the first, second, and third coils.

5. A coil assembly as claimed in claim 4 wherein the ferrite core material is arranged in the form of a cross with the first and second coils wound about arms of the cross and the third coil wound about the distal ends of the arms of the cross.

6. A coil assembly as claimed in claim 1, wherein one of the coils enables greater power transfer than the other coils.

7. A coil assembly as claimed in claim 6 wherein the power transfer capacity of one of the coils is at least 10% more than that of the other coils.

8. A coil assembly as claimed in claim 7 wherein the power transfer capacitor of one of the coils is at least 20% more than that of the other coils.

9. A coil assembly as claimed in claim 6 wherein the length of the conductor of one of the coils is at least 25% greater than the length of the conductors of the other coils.

10. A coil assembly as claimed in claim 9 wherein the length of the conductor of one of the coils is at least 50% greater than the length of the conductors of the other coils.

11. A coil assembly as claimed in claim 1, further comprising a battery cell electronically coupled with the first, second, or third coils.

12. A coil assembly as claimed in claim 11 wherein the battery cell is magnetically shielded by a metal layer.

13. A coil assembly as claimed in claim 12 wherein the metal layer is of about one skin depth.