Battery monitoring systems

Details Battery monitoring systems Battery monitoring systems

1983-09-30

1984-11-20

Shoop, Jr., William M.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 17, 320 32, 320 43, 320 48, H02J 704

Patent

active

044841302

ABSTRACT:
A microprocessor based electric vehicle traction battery monitoring system evaluates the state of charge, interfaces with a traction motor control system, and controls recharging. The state of charge is evaluated during the first part of discharge by integrating the current after compensating it for rate of discharge and during the last part of discharge by dividing the battery into sub-packs and evaluating the state of charge from the lowest sub-pack voltage compensated for polarization voltage. The charge storage capacity is also calculated from the lowest sub-pack voltage. The maximum traction motor current is progressively limited during the last part of discharge. During charging, the charge withdrawn is replaced while progressively reducing the charging current and the battery is then charged at a constant current until the rate of rise of the lowest sub-pack voltage falls below a fixed level.

REFERENCES:
patent: 3484681 (1969-12-01), Grady, Jr. et al.
patent: 3623139 (1971-11-01), Dickerson
patent: 3735234 (1973-05-01), Godard
patent: 4006397 (1977-02-01), Catotti et al.
patent: 4198594 (1980-04-01), Seiger et al.
patent: 4331911 (1982-05-01), Park
patent: 4394741 (1983-07-01), Lowndes
E. Witte, Blei und Stahl-akkumulatoren, 3rd Ed., 1967, pp. 64-65.

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