Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1995-02-16
1997-08-19
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 39, 320 43, 320 48, H02J 700, H02M 1044
Patent
active
056592400
ABSTRACT:
A battery charger connected to a source of substantially constant voltage power includes a regulator for conditioning the power for application to a battery to be charged. Net discharge current from the battery is monitored, as a function of time, during a time period between recharge cycles, and data representative of the net discharge current as a function of time is stored and used to compute net ampere-hour discharge data. The discharge data establish a total recharge ampere-hours to be applied to the battery, which corresponds to the net amount of discharge ampere-hours. The battery charger also compensates the total recharge ampere-hours by an amount determined from the age of the battery, and tracks the number of occurrences of recharge of the battery and the accumulated ampere-hours for applying an equalizing charge to the battery after a predetermined number of recharge occurrences and accumulated ampere-hours since a last equalizing charge. The charger further responds to battery temperature for adjusting the recharge constant voltage profile. The battery state of charge is computed from the monitored net ampere-hours of discharge current, and displayed. The battery may be the propulsion battery for an electric vehicle or for a hybrid vehicle which includes a combustion engine-driven generator to charge the battery.
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General Electric Company
Shin K.
Snyder Marvin
Wong Peter S.
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