Statistics show that there was a vehicle fire about every one to three minutes in the U.S. in 2015. That added up to a total of about 174,000 vehicle fires. Of course, almost zero were electric cars. Yes, there were very few EVs on the road, but still, based on the information, there should have at least been a measurable number of EV fires. According to Tesla's data (via CNN Money):
. . . gasoline powered cars are about 11 times more likely to catch fire than a Tesla. It says the best comparison is fires per 1 billion miles driven. It says the 300,000 Teslas on the road have been driven a total of 7.5 billion miles, and about 40 fires have been reported. That works out to five fires for every billion miles traveled, compared to a rate of 55 fires per billion miles traveled in gasoline cars.
The Batelle study also points out that there have been spontaneous fires caused by lithium-ion batteries in other products like laptops, cell phones, and even passenger jets. However, electric vehicle fires have been caused by a crash or obvious damage to the battery pack. Tesla goes on to explain that its battery packs rarely "incur serious damage" aside from the occurrences during a very severe accident.
Lithium-ion battery pack fires may take longer to start and to spread than gasoline fires. If there is damage to a cell, it may begin to build up heat and ignite chemicals in other cells over time. This is called "thermal runaway." We've seen in many EV crashes that the driver has been able to exit the car and there didn't seem to be a fire initially, though later a fire may have started and proven extremely hot and difficult to put out. Additionally, we've seen EVs removed from a crash site and then start on fire later.
The most promising news related to the study is that most fire risk associated with electric cars - which already seems to be minor in comparison to gas cars - can likely be a curtailed even further with new battery technology. Risser concluded:
Gasoline is a very risky material. We have had
130 years of designs and experience to make a gasoline powered vehicle as safe as possible.
We're still at early stages of understanding how to make lithium-ion batteries safe.
Source: CNN Money
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