The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 1997
Filed:
Nov. 15, 1995
Nokia Mobile Phones Limited, Salo, FI;
Abstract
A battery pack (4) comprises a stack of lithium solid state cells (1) and a DC/DC converter (2) in a housing (3), for use in supplying current to an electronic apparatus, e.g. a portable telephone. This provides a stable voltage for operating the electronic apparatus as the cells become progressively more discharged without having to include a DC/DC converter in the apparatus itself. The battery pack (4) can be arranged to supply current directly from the cells (1) as well as via the DC/DC converter (2), and the DC/DC converter (2) can be made voltage controllable to supply different voltages depending upon requirements. Conductive screening around the battery pack can be provided to prevent electromagnetic interference from the DC/DC converter (2).