TB 172 - Electric/Hybrid Vehicles Flashcards
(44 cards)
The challenge that presents themselves with lithium-ion (Li-Ion) battery systems is that these systems continue to generate what well after the fire is extinguished?
Heat
Ignition in lithium-ion batteries can take place up to how many days after the initial fire?
6 days
What is a term used when a battery cell suffers a short circuit and the battery continues to produce heat even when it is extinguished and/or submerged in water?
Thermal runaway
A lithium-ion battery is subject to what when it has been damaged from either penetration or crushing in a collision, exposed to heat, or internal short circuit due to a factory defect or aging?
Thermal runaway
Lithium-ion batteries will continue to dissipate heat during their de-energizing process and will not stop until completely what?
De-energized
During a thermal runaway event, temperatures can exceed over how many degrees?
900 degrees
The battery cell itself will suffer self-destruction if it’s structure (“pop” noises firefighters hear) and the gases and heat produced will cause the what to vent which is the “thump” noises firefighters may hear on scene as the pressure caps open up?
Module casing
The National Transportation Safety Board (NTSB) and Tesla performed a what to fully de-energize the involved battery in an effort to avoid further re-ignition?
Battery draw down
The NFPA statistics show that about 90 cars catch fire every how many miles driven in the US?
1 billion
In the first billion miles driven by Tesla (mid 2015), there were how many documented fires?
3 fires
An EV vehicles is how much likely to ignite in a collision than an internal combustion engine vehicle?
Less likely
Fires that have occurred with EV vehicles are primarily due to what?
High speed impacts
An exposed EV battery including its wiring and components can do what kind of harm to anyone that comes in contact with it?
Kill
Any EV and hybrid internal combustion electrical vehicle may be what in a collision if the main DC battery and/or it’s wiring have been damaged to the degree where they have come in contact with any of the vehicles metal surface?
Electrically energized
Is the fire service currently equipped to fully disassemble and disable lithium-ion batteries?
No
The on-scene time to address an EV battery thermal runaway event is significantly what than a fire involving an internal combustion engine vehicle?
Higher
At this time the department does not have a what for DC and there is no known tool which include this tool that can identify direct current?
“Hot stick”
NFPA conducted research on EV fires, no what was transmitted through the water stream and nozzle back to the firefighters?
Electricity
LAFD personnel shall establish how large of a safety zone when extinguishing an EV fire with water and wear full PPEs and SCBA?
30 feet
Per NFPA, it could take up to how many gallons of eater to effectively cool down the battery?
2600 to 3000 gallons
Cooling of the lithium-ion battery can only take place as long as the water is introduced to where on the battery?
Inside
What can be used to facilitate the status of the internal thermal runaway and determine if temperatures are going up or down?
TIC
If the battery is still intact after a vehicle fire involving an EV, it will be nearly impossible to penetrate all of the modules and cells with re-ignition of the battery occurring for how many days?
Several days
To ensure penetration into the battery is to completely do what with the battery which can be accomplished by creating a dam with water?
Completely submerge battery in water
