Saltwater flooding a serious fire threat for electric vehicles

Sun Nov 17 03:49:03 UTC 2024: ## Flooded EVs Pose Significant Fire Risk After Hurricanes Helene and Milton

**Charleston, SC – November 17, 2024** – Hurricanes Helene and Milton, which ravaged the Southeastern U.S. in September and October, caused billions of dollars in damage and ignited a concerning number of electric vehicle (EV) fires. Dozens of EVs and other lithium-ion battery-powered devices, including scooters and golf carts, caught fire after being submerged in floodwaters, turning them into what Florida State Fire Marshall Jimmy Patronis described as “ticking time bombs.”

One report tallied 11 electric cars and 48 lithium-ion batteries igniting after exposure to saltwater from Hurricane Helene alone. These fires, often spreading to nearby homes, are difficult to extinguish and release toxic fumes. Firefighters frequently must allow the fires to burn themselves out.

The risk stems from a process called thermal runaway, a chain reaction within the battery triggered by saltwater’s high conductivity. While EV battery packs usually have high waterproof ratings (IP66 or IP67), prolonged submersion, especially in saltwater, can compromise seals and allow water to enter, causing short circuits and rapid corrosion. This can lead to a delayed fire, potentially days after the flooding event. Even discharged batteries retain sufficient voltage to initiate these reactions.

Xinyu Huang, an associate professor of mechanical engineering at the University of South Carolina, warns that consumers are largely unaware of this hazard. He emphasizes the importance of preventative measures, such as evacuating EVs from flood zones or parking them on higher ground before storms. After flooding, especially saltwater submersion, EVs should be treated as fire hazards, kept away from structures, and inspected by professionals before being moved or charged.

Researchers are exploring solutions, including improved sealing techniques, corrosion-resistant materials, and waterproof coatings for battery terminals. While EVs remain generally safe, Huang stresses the critical need for heightened awareness and proactive steps to mitigate the fire risk during severe weather events.