초록 ▼

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

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 During charging, the charge withdrawn is replaced while progressively reducing the charging current and the battery is then charged at a constant current until the rate of rise of the lowest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.

대표청구항 ▼

A charging system for a traction battery pack divided into a plurality of sub-packs comprising: means for charging the battery pack according to a predetermined charging cycle, the charging cycle having a plurality of phases, means for measuring the voltages of the individual sub-packs, means for se

A charging system for a traction battery pack divided into a plurality of sub-packs comprising: means for charging the battery pack according to a predetermined charging cycle, the charging cycle having a plurality of phases, means for measuring the voltages of the individual sub-packs, means for selecting the sub-pack having the lowest voltage, means for determining the rate of rise of the voltage of said selected sub-pack, and means for determining when said rate of rise falls below a predetermined level, one of said phases of the charging cycle being terminated when said rate of rise falls below said predetermined level.