When people picture a vehicle fire, they tend to imagine flames that a single extinguisher will knock down in seconds. Lithium-ion battery fires do not work that way. They are driven by a self-sustaining chemical process called thermal runaway, and that single difference shapes everything about how the fire starts, how it behaves, and what it takes to bring it under control.

According to Fire and Rescue NSW (2025), thermal runaway is an uncontrolled, excessive rise in heat within one or more battery cells, often leading to cell venting and fire. Once a cell fails, the heat it releases can push neighbouring cells past their own failure threshold, creating a cascading chain reaction inside the battery pack.

01What actually happens inside the cell

A lithium-ion cell stores a large amount of energy in a very small space, separated by a thin membrane and a flammable liquid electrolyte. When a cell is damaged, overheated, overcharged, or carries a manufacturing defect, that internal separation can break down. The cell heats, vents flammable and toxic gas, and can ignite. Fire and Rescue NSW (2025) notes that this produces an intense, self-sustaining fire that is difficult to extinguish because the battery effectively supplies its own fuel and, in confined spaces, its own oxygen pathways.

02Why these fires resist normal suppression

Three characteristics make thermal runaway hard to deal with. First is heat: temperatures can climb fast and stay high. Second is toxic gas: cells vent flammable and corrosive vapours, which is why ventilation and standing clear matter as much as suppression. Third is reignition: even a battery that appears extinguished can reignite hours later because stranded energy remains in undamaged cells (Fire and Rescue NSW, 2025).

This is the core reason EV Fire Solutions takes a containment-first position. The realistic goal for most people on the scene is not to "put the fire out" in the conventional sense, but to contain the event, limit fire spread, suppress smoke, and buy time until Fire and Rescue arrive and can apply sustained cooling.

03Rare, but consequential

It is worth keeping the risk in proportion. Verified data shows that EV traction-battery fires are uncommon relative to the size of the fleet, and considerably rarer per vehicle than internal combustion engine fires (Electric Vehicle Council, 2024; EV FireSafe, n.d.). Modelling of Australian conditions by Hassan et al. (2023) likewise frames EV fire incidents as low-frequency but high-consequence events. The takeaway is not alarm — it is preparation. When one of these fires does occur, its behaviour is unusual enough that ordinary equipment and instincts are poorly matched to it.

04What containment equipment is designed to do

This is where purpose-built equipment earns its place. An EV fire blanket is engineered to drape over a burning vehicle or device, smothering flame, cutting the oxygen feeding open burning, and dramatically reducing radiant heat and toxic smoke reaching the surroundings. A lithium-ion rated extinguisher delivers an agent designed to cool cells and interrupt the runaway process. Used together, they cover the two jobs that matter most in the first minutes: isolate the fire, and cool the source.

If you want to match equipment to your specific risk, our Heavy-Duty High Silica EV Fire Blanket and EV Fire Blanket (Electric Car) are built for full-vehicle and heavy-duty containment, while the EV Fire Extinguisher 4L provides lithium-ion rated cooling capacity for commercial settings. Browse the full range of EV fire blankets and EV fire extinguishers to build a layered response.