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Tesla says Model S fire started in battery pack; share prices falling

Yesterday's fire that engulfed a Tesla Model S, the first blaze involving the critically acclaimed electric sedan, was caused when a piece of road debris impacted the front of the car, damaging the battery pack and starting a fire, according to an email sent to AutoblogGreen by Tesla. Now, The New York Times has learned that the fire was indeed caused by debris that made "a direct impact ... to one of the 16 modules within the Model S battery pack," according to Tesla spokesperson Elizabeth Jarvis-Shean.
Despite the blaze, Tesla maintains that the battery packs did their job by isolating the fire, with Jarvis-Shean saying, "Because each module within the battery pack is, by design, isolated by fire barriers to limit any potential damage, the fire in the battery pack was contained to a small section in the front of the vehicle."
The nature of the fire, though, seemed to catch the Kent Fire Department Regional Fire Authority off guard. The department's report, which was obtained by the International Business Times and partially published on Jalopnik, claims that water used to put out the blaze seemed to intensify the fire, forcing the firefighters to use a dry chemical. Later, they found the battery pack still burning inside the front end. The report claims firefighters, "had to puncture multiple holes in the pack to apply water to the burning material in the battery," and also had to cut into the frame to douse the burning pack.

Tesla asks feds to investigate Model S fires, amends warranty to cover fire damage

As of the last official count, there are 19,000 Tesla Model S sedans on US roads. Three of those, as has been widely reported, have caught on fire after significant accidents. That means one in about 6,333 Model S sedans has caught fire, and none of those fires led to any injuries. By way of contrast, there were 172,500 gasoline-car fires in the States last year, which, according to the National Fire Protection Association, equals about one in every 1,450 vehicles on US roads.
In a move we'd describe as very baller, Tesla has amended the warranty to cover damage due to a fire, even if due to driver error.
Put more simply, as stated by Elon Musk in his latest posting on the official Tesla Motors blog, "You are more than four and a half times more likely to experience a fire in a gasoline car than a Model S! Considering the odds in the absolute, you are more likely to be struck by lightning in your lifetime than experience even a non-injurious fire in a Tesla." While the assertion of dangerous lightning strikes may be just as spurious a correlation as those who claim the Model S is a burning inferno waiting to happen, the point is clear: You are quite unlikely to experience a fire in a Tesla Model S.

For Tesla, the energy-storage company, the magic is in batteries

Tesla Motors Chief Elon Musk has always been a big-picture guy, and the company's chief technology officer appears to be following suit. JB Straubel, who was a keynote speaker at the Joint Venture Silicon Valley symposium near the automaker's Northern California home base recently, says the company is just as much an energy-storage company as a car maker. And he said the rate of battery-technology improvement shows no signs of slowing down, according to Green Tech Media. Straubel estimated that battery performance has improved about 40 percent during the five years between the debuts of the Tesla Roadster and the Model S. Additionally, battery density has doubled during the past decade and continues to ramp up fairly steeply. He noted that further near-term improvements will come not from the size and shape of the cell, but from improved cathode and anode materials. Those energy improvements won't just help the cars. Tesla uses a two-megawatt-hour battery pack to supply as much as 10 percent of the peak energy used at the company's factory in Fremont, CA, and will double the size of that battery-powered energy capacity within the next few months, Straubel says. Automakers like Tesla and Nissan are licking their proverbial chops at the prospect of substantially improved battery performance paired with declining battery costs as more and more lithium-ion battery packs get produced. Late last year, Navigant Research estimated that lithium-ion battery costs would fall by almost two-thirds by 2020, down to a low $180 per kilowatt hour. That should make electrified powertrains price-competitive with conventional vehicles, as electric vehicles could then command a price premium as low as $2,000 compared to their gas-powered brethren.