Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1996-12-20
1998-03-17
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 39, 320 31, 320 21, H01M 1044, H02J 704
Patent
active
057291160
ABSTRACT:
An apparatus and method of recognizing a shunt caused by formation of dendrites in a rechargeable lithium battery which comprises charging the battery with a charging current, sampling the charging current voltage of the battery at pre-determined time intervals in order to identify one or more point indicating onset of shunting, and terminating charging if the shunt or dendrite is indicated. If a shunt is not recognized charging is continued. Dendrite formation or the beginning of shunting due to such formation is indicated by any one of the following conditions: a negative gradient in sampled voltage values; a negative gradient in sampled steady open circuit values; and a negative gradient in the chemical polarization voltage values which may be calculated by sampling both the open circuit voltage soon after current interruption and steady open circuit voltages during a plurality of currentless phases.
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Shin K.
Total Battery Management, Inc.
Wong Peter S.
LandOfFree
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