Light Duty Hybrid/Electric Vehicle Flashcards

When storing a damaged or recalled high-voltage battery, what is a recommended practice?

Answer: Keep it in a designated, ventilated area away from combustibles

Damaged HV batteries are stored in isolated, ventilated, fire-safe areas to mitigate thermal runaway risk.

What does 'state of charge' (SOC) describe for a high-voltage battery?

Answer: The current available capacity as a percentage of full charge

State of charge expresses how much usable energy remains relative to the battery's full capacity, like a fuel gauge.

Why do hybrid battery management systems avoid charging the pack to 100% or fully depleting it?

Answer: To extend battery life by limiting stress on the cells

Operating within a middle SOC window reduces cell degradation and prolongs battery service life.

A technician needs to lift a high-voltage battery pack for service. What is the best practice?

Answer: Use OEM-specified lifting equipment due to the pack's heavy weight

HV packs are heavy and require manufacturer-approved lifting tables or hoists to prevent injury and damage.

What warning label or symbol indicates a high-voltage hazard on a vehicle component?

Answer: A yellow triangle with a lightning bolt

The standard high-voltage warning is a yellow triangle containing a black lightning bolt symbol.

What is the function of an equipotential bonding (ground) strap in an EV high-voltage system?

Answer: To ensure the chassis and HV enclosures share a common potential for safety

Bonding straps keep conductive parts at equal potential so isolation faults can be detected and shock risk minimized.

If an EV's isolation monitoring system detects a loss of isolation, what does this typically indicate?

Answer: High voltage may be leaking to the chassis, creating a shock hazard

A loss of isolation fault means HV could reach the vehicle's conductive chassis, posing an electrocution risk that requires immediate attention.