Electricity: measuring and testing – Electrolyte properties – Using a battery testing device
Patent
1995-03-09
1997-02-11
Arana, Louis M.
Electricity: measuring and testing
Electrolyte properties
Using a battery testing device
324426, G01N 27416
Patent
active
056024819
ABSTRACT:
Disclosed is a series connection circuit for secondary batteries for preventing a reduction of energy usable as the builtup battery due to a difference of DOD of the batteries and a difference of voltage detection level of voltage detectors. The circuit includes voltage detectors for detecting the terminal voltage of the secondary batteries thereby to calculate the respective values of DOD thereof, transistors for discharging the secondary batteries independently, a charging unit to charge the secondary batteries and a controller for controlling the independent discharging operation of the transistors corresponding to the respective values of DOD. With the arrangement mentioned above, it is possible to equalize the values of DOD, whereby the reduction of usable energy caused by the increasing of difference of DOD can be prevented.
REFERENCES:
patent: 3942104 (1976-03-01), Byrne
patent: 5170124 (1992-12-01), Blair et al.
patent: 5302902 (1994-04-01), Groehl
Arana Louis M.
Nissan Motor Co,. Ltd.
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