Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1994-01-24
1996-08-27
Nappi, Robert
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 31, 320 35, H01M 1044
Patent
active
055504531
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).
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Bergquist Eric A.
Bohne William C.
Garrett Scott M.
Massaroni Kenneth M.
Melamed Philip
Motorola Inc.
Nappi Robert
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