Electricity: battery or capacitor charging or discharging – Sequential charging or discharging of batteries or cells
Patent
1997-06-20
1999-08-31
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Sequential charging or discharging of batteries or cells
320134, 324434, G01N 27416, H02J 700
Patent
active
059458054
ABSTRACT:
A cell evaluating method for evaluating characteristics of a secondary cell which can be repeatedly charged and which includes a step of detecting a cell voltage after a predetermined first charge operation for the cell is started, a step of, if the detected cell voltage is smaller than a reference voltage, proceeding to a second charge operation different from the predetermined first charge operation, and a step of evaluating a state of the cell. Moreover, the cell evaluating method includes a step of carrying out a first cell voltage detection after a first predetermined period of time has passed since a halt of the charge or discharge of a cell, a step of carrying out a second cell voltage detection after a second predetermined period of time has passed, and a step of evaluating, if the difference between the results of the first and second detections is not smaller than a predetermined value, that an internal short circuit occurs in the cell.
REFERENCES:
patent: 4044300 (1977-08-01), Dupuis et al.
patent: 4280097 (1981-07-01), Carey et al.
patent: 4387332 (1983-06-01), Oyamada et al.
patent: 4937528 (1990-06-01), Palanisamy
patent: 5705911 (1998-01-01), Tamai
Nagai Tamijia
Suzuki Kuniharu
Takei Toshitaka
Maioli Jay H.
Sony Corporation
Toatley, Jr. Gregory
Wong Peter S.
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