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Replies to post #54253 on Tesla Inc (TSLA)
10/02/21 8:33 PM
Secondly there has been geomagnetic activity everyday for the last 4 billion years. Trying to equate Tesla accidents to that would be like saying " I noticed there was a Tesla accident everyday there was either sun or darkness...lol
The most probable cause of this fire is a high resistance connection at the wall socket or the Universal Mobile Connector to the Tesla car. Improper installation can cause over heating and result in spontaneous combustion.
Tesla, meanwhile, has conducted its own inspection of the car, its charging cable, and the vehicle’s data log, and concluded that the battery was charging normally. The company said in a statement, “Based on our inspection of the site, the car and the logs, we know that this was absolutely not the car, the battery or the charge electronics. There was a fire at the wall socket where the Model S was plugged in, but the car itself was not part of the fire. The cable was fine on the vehicle side; the damage was on the wall side.”
The most likely explanation, according to fire protection engineer Klaus Schmidt, an associate professor at the University of M.I.T, is poor wiring. “Imagine a wire barely touching onto a screw,” he said. That bad contact can create resistance heating. “Otherwise, if that’s done properly, two things need to be a problem: the car needs to be drawing too much current, and the circuit breaker in the house didn’t activate. Both those things can happen, but it’s unlikely both those things happen at the same time—it’s a two-point failure.” Sunderland, whose current work includes fire-testing lithium battery cells for Ford, also offered a third explanation. “It’s possible the electrical outlet was faulty, just made badly in the factory.”
According to the National Fire Protection Association the main cause of fires in garages or spontaneous combustion like the recently reported tesla fires are always result of human error. Fires can result from “outdated wiring that is deteriorating, inappropriately amended, or insufficient for the electrical loads of a typical household in the 21st Century,” the U.S. Fire Administration warns. “If an outlet is added to an existing circuit, then the load easily can be more than the wiring originally was designed to conduct.
NFPA says “Gasoline is very flammable,” 10 times more dangerous then EV cars. “and can catch fire in your garage, too.”
All Tesla fires have been concluded by the NHTSA to be caused by the electric vehicle's battery suffering some kind of trauma, sometimes by crashing at high speeds. In the Davie incident, the driver was going between 75 mph and 90 mph on a road with a 50-mph speed limit. The two teens who died in Fort Lauderdale were going 116 mph.
"There are really only a few reasons why a lithium-ion battery catches on fire," Archer said. "Liquid, dead short," or, for every one battery cell in a billion, "spontaneous combustion."
In the Shanghai Tesla garage fire a damaged battery cell — whether the damage has been done by some kind of impact, water damage, or manufacturing defect — can go into "thermal runaway." That's when the temperature in the cell rapidly increases and then triggers the same reaction in another cell and another one after that. That is called "cellular propagation," and in some cases it manages to stop itself inside the battery.
Elon Musk complained of “double standard” on Twitter after a vehicle ignited on its own in Shanghai on April 21, saying that “over a million combustion engine car fires per year & thousands of deaths, but one Tesla car fire with no injuries gets biggest headlines.”
10/02/21 10:37 PM
