Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1993-02-08
1996-08-06
Nappi, Robert
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 6, 320 32, H01M 1044
Patent
active
055437028
ABSTRACT:
A battery charger and method are disclosed for charging alkaline, Ni-Cad and zinc-based batteries, particularly sizes N, AAA, AA, C and D. For batteries rated at about 1.25 volts to about 1.5 volts, the battery charger and method provide a constant charging current of between about 0.28 ma to about 1.5 ma per gram weight of the battery. A substantially constant current is supplied to the battery while a reference voltage greater than the battery voltage is provided. Thereafter, as the battery voltage increases, the reference voltage is incremented up to a predetermined maximum reference voltage. Charging is terminated when the reference voltage reaches the predetermined maximum, or when the battery voltage does not increase during charging to be greater than a first or a subsequent reference voltage during a predetermined charging time period. The controller may also cause the constant current to be increased by from about 2.5% to about 25% for up to a predetermined testing time period, and terminate the supply of current to the battery if the battery voltage increases by greater than a predetermined amount. The battery charger may at the same time charge batteries of different sizes, and includes a separate constant current circuit for each battery in the battery charger. Each battery is continuously supplied with charging or testing current as determined by the controller, and the controller controls charging of each battery independently of the charge condition of any other battery. A separate controller may control each constant current circuit, or a microprocessor may control all of the constant current circuits.
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Nappi Robert
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