Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1994-02-28
1997-05-06
Tso, Edward H.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 35, 320 39, H01M 1044, H01M 1046
Patent
active
056274513
ABSTRACT:
A method for controlling a secondary battery constant current charging method and a control apparatus therefor, which measures battery voltage (V), a change in battery voltage per unit time (.DELTA.V/.DELTA.t), a decrease in battery voltage (-.DELTA.V) from a maximum value, battery temperature (T), and/or a change in battery temperature per unit time (.DELTA.T/.DELTA.t); and stops the battery charging when .DELTA.V/.DELTA.t is greater than or equal to a predetermined value after the passage of a predetermined time t.sub.S, or when .DELTA.V/.DELTA.t and .DELTA.T/.DELTA.t are greater than or equal to predetermined values, or when .DELTA.V/.DELTA.t and T are greater than or equal to predetermined values, or when V is greater than or equal to a maximum value V.sub.P, or when either the -.DELTA.V or T is greater than or equal to a predetermined value.
REFERENCES:
patent: 4388582 (1983-06-01), Saar et al.
patent: 4392101 (1983-07-01), Saar et al.
patent: 4639655 (1987-01-01), Westhaver et al.
patent: 5371453 (1994-12-01), Fernandez
Fujitsu Limited
Tso Edward H.
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