CAR - Certified Automotive Recycler Electric & Hybrid Vehicle Processing Questions and Answers

Question 1

A recycler receives a hybrid vehicle with front-end collision damage. The 12V battery is accessible, but the high-voltage service disconnect is under a damaged panel. What is the mandatory first step for the technician before attempting any repairs or dismantling?

Accepted Answer

Disconnect the 12V battery and wait the manufacturer-specified time for the HV system to de-energize.

Answer

The universally accepted first step in disabling a high-voltage system is to disconnect the 12V battery. This action opens the relays that isolate the high-voltage battery from the rest of the vehicle's systems. Waiting for the manufacturer-specified time (often 5-15 minutes) is critical to allow capacitors within the system to discharge safely. Attempting to access the HV disconnect first or draining fluids bypasses this crucial safety protocol.

Question 2

When processing an electric vehicle, what is the primary purpose of the components identified by bright orange-colored cabling?

Accepted Answer

To carry high-voltage current between the main battery, inverter, and motor.

Answer

The use of orange coloring is a federally regulated, industry-wide standard to visually identify cables and components carrying dangerous high-voltage electricity. These circuits connect the main traction battery to the inverter and electric motor(s), operating at voltages that can be fatal. All other systems listed use standard low-voltage wiring.

Question 3

Which of the following represents the most critical and immediate safety risk associated with storing a high-voltage lithium-ion battery that was removed from a physically damaged EV?

Accepted Answer

The potential for thermal runaway and subsequent fire.

Answer

Physical damage to a lithium-ion battery can cause internal short-circuiting, which can lead to thermal runaway. This is a rapid, uncontrollable self-heating chain reaction that can result in the release of toxic gases, fire, and even explosion. While other issues are possible, thermal runaway is the most severe and acute hazard.

Question 4

A technician has successfully disabled the high-voltage system and removed the main battery pack from an EV. The battery pack appears undamaged. According to best practices, how should this battery be stored while awaiting sale?

Accepted Answer

In a designated, dry, temperature-controlled area away from flammable materials.

Answer

Proper storage of high-voltage batteries is crucial for both safety and preserving battery health. Best practices require a dedicated, climate-controlled (cool and dry), and secure area that is separate from flammable or combustible materials. Storing batteries outdoors exposes them to environmental damage, while storing them with flammable materials increases fire risk. Improper stacking can cause physical damage.

Question 5

When preparing to ship a large, end-of-life lithium-ion battery from a hybrid vehicle, what is a primary requirement under the U.S. Department of Transportation (DOT) regulations?

Accepted Answer

The battery must be properly packaged, labeled, and declared as a Class 9 Hazardous Material.

Answer

The U.S. DOT classifies lithium-ion batteries as a Class 9 Hazardous Material (Hazmat) for transportation due to their potential fire risk. This classification requires shippers to adhere to strict rules regarding packaging, labeling (with the Class 9 placard and lithium battery mark), and shipping documentation. Terminals must always be protected against short-circuiting.

(CAR) Certified Automotive Recycler Practice Test

(CAR) Certified Automotive Recycler Practice Test

CAR - Certified Automotive Recycler Electric & Hybrid Vehicle Processing Questions and Answers