AARC EV & Hybrid Vehicle Processing 5

Question 1

What is the recommended minimum safe approach distance from a burning EV battery fire for untrained personnel?

Accepted Answer

100 feet

Answer

Fire departments recommend at least 100 feet (30 m) for untrained bystanders due to explosion risk, toxic fumes, and re-ignition potential.

Question 2

Which toxic gas is produced when lithium-ion battery electrolyte burns or vents during thermal runaway?

Accepted Answer

Hydrogen fluoride (hydrofluoric acid vapor)

Answer

Lithium hexafluorophosphate electrolyte decomposes during thermal runaway to release hydrogen fluoride, an extremely toxic and corrosive gas.

Question 3

A customer wants to purchase a used Prius Gen 3 (2010-2015) NiMH battery module. What minimum warranty disclosure is considered best practice for AARC members?

Accepted Answer

Remaining capacity test results and as-is condition statement

Answer

AARC best practices require disclosing capacity test results and selling used battery components as-is with documented condition to set buyer expectations.

Question 4

During EV disassembly, a technician notices the battery pack casing is swollen and deformed. What is the correct immediate response?

Accepted Answer

Isolate the vehicle outdoors, increase monitoring frequency, and contact hazmat if gases detected

Answer

Swelling indicates gas buildup from cell degradation; the pack should be isolated outdoors and monitored for thermal runaway precursors before further handling.

Question 5

What is the function of the pre-charge circuit found in most EV inverter systems?

Accepted Answer

To gradually charge inverter capacitors before the main contactor closes, preventing inrush current damage

Answer

The pre-charge resistor slowly charges inverter capacitors to battery voltage before the main contactors close, preventing damaging inrush current surges.

(AARC) Accredited Automotive Recycler Certification Practice Test

(AARC) Accredited Automotive Recycler Certification Practice Test

AARC EV & Hybrid Vehicle Processing 5