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Owner of Battery Fire Tesla Vehicle: Car 'Performed Very Well, Will Buy Again'
cartechboy writes "The Tesla Model S fire that, to date, is either electric car Armageddon or 'no big deal' has been fun Internet theatre combined with a dose of crowd-sourced battery-pack pseudo-expertise. Now the actual car owner (and Tesla investor) weighs in with his take, which is, basically, 'nothing to see here and yes, I can't wait to get back into a Tesla.' Owner Robert Carlson wrote an email in response to contact by Tesla's vice president of sales and service, Jerome Guillen, saying he found the car had 'performed very well under such an extreme test. The batteries went through a controlled burn which the Internet images really exaggerates.' Carlson had no comment on the guy who videoed his car fire, who is now Internet infamous for shooting video in portrait mode." You can read Elon Musk's take, along with Carlson's correspondence.
It's powered by flaming batteries.
Only in vapor form. You can put out a match by dipping it in gasoline. That's part of the reason gasoline is such a good vehicle fuel.
Good luck having a condition where you have spilled liquid gasoline but no gasoline vapor, which is QUITE flammable.
Gasoline was chosen as a vehicle fuel because once upon a time it was a waste product of kerosene production, so it was cheap and plentiful. The advantage it had was being VERY VOLATILE - easily evaporating into the air to form an explosive mixture. A carburetor does not need to "condition" it at all, just deliver a carefully controlled dose. Because of this you could produce an internal combustion engine without the need for a fuel injection system like diesel engines required, and with a lower compression ratio, so the engines would be simpler, lighter and faster. Less efficient, too, but who really cared when the fuel was so cheap?
=Smidge=
My neighbor's truck caught fire shortly after he parked it. Problem was a fuel pump which did not shut down properly, and continued to pump fuel to a hot engine with a leak on the fuel injector rail.
Things went from bad to worse very fast.
He was able to push the thing into the middle of the street while it was in the infancy of the burn stage.
During the height of the burn, all of the neighbors were out with their garden hoses trying to keep the gasoline down, but kinda useless... the tank overheated, ruptured, and sent a small stream of ignited gasoline down the street. Of course, everybody moved their cars pronto. The gasoline went on into the gutter and went underground - what happened to it down there is anyone's guess, but it was well lit and smoked a lot down there.
Point I am trying to make is that when the energy which was intended to move a car and its passengers hundreds of miles is released in the space of a few minutes, the results can be spectacular, and destructive.
The fact the car did not literally explode says a heck of a lot.
Till they fixed this problem I certainly will stay away from any Nvidia product.
Musk's bottom line is the accident outside Seattle that caused the Model S sedan and its battery pack to go up in smoke would have been far worse had it been a conventional gasoline-powered car. "Had a conventional gasoline car encountered the same object on the highway, the result could have been far worse," Musk, who is also CEO of rocket maker SpaceX, writes on Tesla blog. Just as authorities have reported, he says the Model S struck a "large metal object" as it traveled at highway speeds. It went under the car and struck with a force "on the order of 25 tons." He says the estimate is based on the result: a 3-inch hole through armor plate that compromised the car's battery pack. But from there, he says everything went as it should. The car's "onboard alert system" directed to the driver to stop and get out. The fire was contained by firewalls within the battery pack. Vents in the pack directed the flames down and away from the vehicle. The fire department followed the correct procedure in trying to deal with the fire by puncturing holes in a protective plate and shooting water into the pack. If the same accident had occurred under a conventional car, the thin metal shielding around the gas tank or tubing could have caused gasoline to pool and burn the entire car to the ground. "In contrast, the combustion energy of our battery pack is only about 10% of the energy contained in a gasoline tank and is divided into 16 modules with firewalls in between. As a consequence, the effective combustion potential is only about 1% that of the fuel in a comparable gasoline sedan," Musk writes. http://www.usatoday.com/story/money/cars/2013/10/04/elon-musk-tesla-fire/2924423/
Here is some interesting information on car fires from the US Fire Administration (USFA->FEMA->DHS) and the National Fire Protection Association.
From 2008-2010 "Approximately one in seven fires responded to by fire departments across the nation is a highway vehicle fire. This does not include the tens of thousands of fire department responses to highway vehicle accident sites.". The leading factors in ignition where "mechanical failure" (44.1%) and "electrical failure" (22.3%). 1
The actual number of highway car fires in that period was approximately 582,000, or an average of over 500 car fires every day on American highways.2
In this accident which involved an electric car a large piece of sparking metal debris was run over by the car and thrown up with enough force to slice through the cars stored energy compartment, in this case one of the batteries. The driver was alerted via the display to a problem and instructed to pull over immediately due to the fact that one of the batteries was now leaking and smoldering. A short time later the burning ember reached critical temperature and was able to ignite the softer materials in the adjoining 'frunk', the carpeted front side trunk located where most cars have an engine. The other 15 battery compartments, having not been skewered by a giant metal spike, remained unharmed due to the firewalls and other protection, as did the passenger compartment.
If the owner had been driving a gas powered car and that metal spike had instead been driven up into the gas tank, ripping it open and showering the fuel with sparks as it was dragged along the highway, would the driver have had any warning other than a loud bump and then the passenger compartment being consumed by flames?
This is not the first Tesla fire, there was another involving the Roadster resulting in a recall of 439 vehicles. The source of the fire in that instance was not the advanced battery at all, it was one of the old style 12V lines (Tesla vehicles still include a regular 12V battery for lights/instruments and 'ignition') being in a bad position near a headlight and susceptible to damage that could spark a fire. Going back to the statistics above we have over 100 car fires each day (22.3% of 500) caused by those 12V wires and components being damaged and shorting out. For example Honda recalled over 140,000 (non-hybrid) Fits in the US this year because the wiring in a 12V door switch could get wet, short out and start a fire. GM had the same problem last year and had to recall almost half a million vehicles.