Problem sa baterijama nije učestalost požara već njegov intenzitet i to što neiskusni vatrogasci mogu pomisliti da su ugasili požar da bi se on reaktivirao ubrzo po njihovom odlasku zbog pozitivne toplotne povratne sprege unutar baterija (thermal runaway).

When firefighters arrived at the scene of an activated smoke detector in a Hackensack parking garage one early morning in March, they began searching for the source of the smoke. Once they found the parked car on fire, they quickly knocked down the flames.

However, because the car was an electric vehicle, firefighters remained on the scene for more than seven hours, spraying thousands of gallons of water to cool down the battery to ensure it didn’t reignite.

“What happens in the battery, it goes into a thermal runaway — the battery just keeps generating its own heat,” Hackensack Fire Capt. Peter Rocco said. “It takes a long time to cool that down. We’re talking seven hours of an inch-and-¾ hose line just flowing water.” (...)

While fires in electric vehicles are relatively rare compared with conventional car fires, departments need specialized training, equipment and guidance on the best strategies to deal with them, experts said.

Fires in electric vehicles burn much hotter than those in conventional gas-powered cars and are more challenging to extinguish fully. The temperature of an electric vehicle fire can reach 5,000 degrees Fahrenheit, compared with 1,500 degrees in a gas-powered car fire.

The battery pack at the bottom of electric vehicles, just about 5 or 6 inches from the ground, is contained in a strong case made from titanium or a similar material and is designed to protect the battery, but it’s difficult for firefighters to reach and cool down during a fire.

Inside are thousands of lithium-ion cells that allow the battery to store energy. If a fire ignites, heat can continue to spread through the cells — a phenomenon called thermal runaway — and there is a danger of reignition hours after the fire appears to have been extinguished.

“You get these reignition issues, where you think the battery fire is out, but it really isn’t,” said Glenn Corbett, a professor of fire science at John Jay College of Criminal Justice in Manhattan and a longtime volunteer firefighter in Waldwick. “Lithium batteries are everywhere. The fire service has to catch up — we have to figure out how do we deal with this. For the most part, there is no standardized process.”

https://www.northjersey.com/story/news/2024/05/21/ev-battery-fires-burn-hot-officials-warn-of-dangers/73348135007/#

5000 °F = 2760 °C

1500 °F = 816 °C

Edited 6 hours ago6 hr by vememah

3 hours ago, Venom said:

Ok, benzin nije zapaljiv, zapaljive su samo zle baterije.

I one pod odredjenim uvjetima.

Ne mogu bas tek tako.