Battery monitoring systems

Patent · Tue Nov 20 00:00:00 EST 1984

OSTI ID:6110473

Lowndes, M W; Adams, D S; Arlidge, N J

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 During charging, the charge withdrawn is replaced while progressivley reducing the charging current and the battery si then charged at a constant current until the rate of rise of the lowest sub-pack voltage falls below a fixed level.

• Assignee: Lucas Industries Limited (United Kingdom)
• Patent Number(s): US 4484130
• OSTI ID: 6110473
• Resource Relation: Patent Priority Date: Priority date 30 Sep 1983, United Kingdom of Great Britain and Northern Ireland (UK); Other Information: PAT-APPL-537978
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
25 ENERGY STORAGE
COMPUTERIZED CONTROL SYSTEMS
DESIGN
ELECTRIC BATTERIES
MONITORING
ELECTRIC-POWERED VEHICLES
BATTERY CHARGING
CHARGE STATE
ELECTRIC DISCHARGES
MICROPROCESSORS
COMPUTERS
CONTROL SYSTEMS
ELECTROCHEMICAL CELLS
ELECTRONIC CIRCUITS
MICROELECTRONIC CIRCUITS
VEHICLES
330300* - Advanced Propulsion Systems- Electric-Powered Systems
250904 - Energy Storage- Batteries- Other Applications