Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1994-12-09
1996-09-17
Wong, Peter S.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
320 22, H01M 1044, H01M 1046
Patent
active
055571891
ABSTRACT:
A battery charging apparatus for charging the electricity from a current source to a cell includes a variable resistor in parallel with the cell, a cell voltage detection unit for detecting the current voltage value of the cell and a comparator for comparing the current voltage value to a pre-set voltage value. The resistance value of the variable resistor is controlled responsive to the results of comparison so that the current from the current source is caused to flow through both the cell and the variable resistor with progress in the charging of the cell. The current is prevented from flowing through the cell when the cell is fully charged, so that overcharging is eliminated. If plural cells are charged in series, the control operation of not causing the current to flow through the fully charged cell can be carried out for each of the cells, so that integrated charging may be continued until all of the cells are fully charged thus shortening the cell charging time.
REFERENCES:
patent: 4238721 (1980-12-01), DeLuca et al.
patent: 4614905 (1986-09-01), Petersson et al.
patent: 5387857 (1995-02-01), Honda et al.
Fujiwara Nobuhiro
Iijima Minoru
Ishihama Yasuyuki
Suzuki Mamoru
Law Patrick B.
Maioli Jay H.
Sony Corporation
Wong Peter S.
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