System and method for determining an isolation resistance of a battery pack disposed on a vehicle chassis

摘要

A system for determining an isolation resistance is provided. The system includes a voltage source that applies an output voltage level between first and second electrical terminals of a battery pack. The system further includes a voltage meter that measures a first voltage level between the first electrical terminal and a vehicle chassis, and measures a second voltage level between the first electrical terminal and the vehicle chassis when a resistor is coupled between the first electrical terminal and the vehicle chassis. The voltage meter measures a third voltage level between the second electrical terminal and the vehicle chassis. The system further includes a microprocessor that determines a first isolation resistance value based on the first, second, third voltage levels and the predetermined resistance level.

主权项

1. A system for determining an isolation resistance of a battery pack disposed on a vehicle chassis, the battery pack having at least first and second battery modules, the battery pack further having first and second electrical terminals, comprising:
a voltage source configured to be electrically coupled to the first and second electrical terminals of the battery pack, the voltage source configured to apply an output voltage level between the first and second electrical terminals that is indicative of a predetermined voltage level to be output by the battery pack when the first and second battery modules are not electrically coupled in series with one another; a voltage meter configured to measure a first voltage level between the first electrical terminal and the vehicle chassis; the voltage meter further configured to measure a second voltage level between the first electrical terminal and the vehicle chassis when a resistor is electrically coupled between the first electrical terminal and the vehicle chassis, the resistor having a predetermined resistance level; the voltage meter further configured to measure a third voltage level between the second electrical terminal and the vehicle chassis; and a microprocessor configured to operably communicate with the voltage meter, the microprocessor further configured to determine a first isolation resistance value associated with the battery pack based on the first voltage level, the second voltage level, the third voltage level, and the predetermined resistance level.