Don’t Blame EVs For This Fire

October 13th, 2023

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I’m not sure if you caught this one on the news recently but recently, Luton Airport in London was shut down because of a major fire that ripped through a full car park, writing off over 1000 cars.  It wasn’t long until someone posted videos of this on YouTube and other social media, with at least one video – which went viral – either suspecting or outright blaming EVs for the fire and even claiming that this would kill the EV market.

Well, we all know that the social media is not the most reliable source of new, unless its news about your family members and friends that they post directly (and even then, it can be dodgy!). According to the officials investigating the fire, it looks as though a diesel car was to blame. All vehicles get pretty dramatic when fire is involved, either thanks to being full of a highly combustible substance (petrol or diesel) or prone to thermal runaway in the case of a short-circuit (in the case of EVs) or both (hybrid vehicles), so once the fire got started, every new car involved in the blaze made the problem worse. On top of that, the building didn’t have a proper sprinkler system. What were they thinking?

Were EVs involved in the Luton Airport car park fire? Well, given that London usually has a congestion charge but exempts EVs from this, I think it’s safe to say that a few EVs would have been caught up in the inferno. However, it looks as though they weren’t the cause. The claims probably arose because there have been warnings put out by several fire departments and authorities that lithium batteries are one of the most rapidly growing causes of fires. However, it’s not EVs that tend to get the firefighters called in. Instead, the more culprits are e-bikes and e-scooters that have been plugged into the charger for too long, resulting in the battery overheating and triggering thermal runaway.

EV fires are not particularly common because the designers know about the problem and have done their darnedest to prevent them happening. They are still working to ensure that the battery pack can’t be damaged easily, as anything that crushes or punctures the battery pack can trigger a reaction. The problem is that lithium battery fires burn differently from petrol or diesel fires (and a lot hotter), and the technique of putting them out quickly is different, and it’s something that firefighters may not have been trained in, although that’s changing as EV uptake increases – to say nothing of those annoying e-bike and e-scooter fires. This is partly because starving the reaction of oxygen (which works for combustible things) doesn’t work in the case of thermal runaway. The difference between the way ICEs burn and the way EVs burn is reminiscent of some of the advice given by Marmie in Little Women:

He has a temper, not like ours—one flash and then all over—but the white, still anger that is seldom stirred, but once kindled, is hard to quench. 

It’s not the case that EVs are more prone to catching fire because of the batteries. Petrol and diesel cars can also burn nastily, though probably not the way you see them do in the movies, where even one bullet turns a car into a fireball. It’s just that EVs are different, and what causes them to catch fire can be unexpected, so people don’t know to avoid the risk.

So what can you do to minimize your risk of a fire in your new EV? Here are some tips I’ve come across:

• Watch out for sharp objects on the road. Physical damage to the battery can trigger thermal runaway – in fact, this is probably one of the most notorious causes of EV fires. Potholes can be quite nasty, so if you end up driving an EV through one of these, get it checked pronto. The same applies to loose stones.  This is probably also the reason why EVs aren’t as popular in circles and places where serious bush-bashing happens and dirt roads are common, as the potential for damage is much higher.
• Keep the car at the right temperature. An EV is like Goldilocks – it doesn’t like to sit somewhere too cold (in which case, the battery will sulk) and it doesn’t like being too hot either. In a well-ventilated garage is probably the best, with air conditioning if you live in a particularly hot part of the country, or at least in the shade in summer.
• Avoid charging the battery to 100%. Stop short of the maximum. Overcharging is usually the root cause of fires in smaller lithium batteries (phones, e-bikes, laptops, etc.). It’s recommended to keep the battery level between 20% and 80%. This may mean that you have to be more vigilant when charging your vehicle and keep an eye on progress, either via an app or in person.