Portable contact-less power transfer devices and rechargeable batteries

  • US 7,248,017 B2
  • Filed: 11/22/2005
  • Issued: 07/24/2007
  • Est. Priority Date: 05/13/2002
  • Status: Active Grant
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First Claim
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1. A rechargeable battery adapted to receive power inductively from an external unit when fitted into a battery holder in a portable electrical or electronic device, the external unit having a field generating surface and a field generator which generates an electromagnetic field at or over the field generating surface, and the device being adapted to be placed in an intended power-receiving disposition on or in proximity to said field generating surface of the external unit when the battery is to be recharged, and the device comprising a housing including a predetermined portion having an external surface which faces said field generating surface when said device is placed in its said power-receiving disposition, the battery comprising:

  • a magnetic core component carried in or by said battery in such a way that when the battery is retained by said battery holder and said device is in its said power-receiving disposition the core component is in proximity to an internal surface of said predetermined portion and couples with the field, the magnetic core component including a thin sheet of magnetic material and also including a coil wound around said sheet for receiving power inductively from the external unit, the sheet and the coil being arranged so that a longitudinal axis of the sheet and a central axis of the coil each extend generally parallel to said field generating surface when the battery is retained in said battery holder and the device is in its said power-receiving disposition.

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