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. 27, 1996
Filed:
Jan. 24, 1994
William C Bohne, Elgin, IL (US);
Eric A Bergquist, Hinsdale, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
In a method and apparatus for battery charging, a battery charger (20) charges a battery (11), preferably in a battery pack (10), by providing an initial battery charging current (I.sub.1) and terminating the initial charging current at a time t.sub.2 in response to a measured battery condition (for example, battery temperature rate of change; Delta T/Delta t) exceeding a limit. A battery parameter, preferably battery voltage, is measured at the time t.sub.2 and stored as a limit (V.sub.peak). After t.sub.2, battery charging current is provided in accordance with a predetermined criteria and battery charging current is altered (to I.sub.3 ; or to I.sub.1) in response to comparing a measured battery parameter, preferably battery voltage, after t.sub.2 to a threshold (V.sub.peak ; or V.sub.peak -Delta V) based on the stored limit (V.sub.peak). Preferably, rapid battery charging is implemented in response to a comparison of a measured battery parameter, preferably battery voltage, after the time t.sub.2 with respect to a threshold (V.sub.peak -Delta V) determined in accordance with the stored limit (V.sub.peak).