Thousands of covered car parks may need retrofitting, along with new considerations for new-builds, to reflect the different fire safety implications of electric vehicles compared to combustion engines.
Working with the UK’s Office for Zero Emissions Vehicles (OZEV), Arup has produced interim safety guidance to support parking and/or charging of electric vehicles within covered car parks.
The full transition to electric vehicles (EVs) will be one of the most important actions to achieve the net zero. In the UK, new sales of non-electric vehicles will be banned from 2030, and to make that happen, infrastructure needs to be upgraded to meet the needs of large numbers of electric passenger vehicles and vans.
One of the main challenges is the need to provide sufficient charging capacity, and in the UK, grant programmes have been undertaken to accelerate EV charge point installation. However, until now, there has been limited guidance on safety around fire risk at charge points.
EV fires are rare but need different responses
EV fires are rare. Data reported by Arup shows that in Norway, where EVs make up almost ten percent of cars, they make up less than three percent of vehicle fires.
At the same time, Thatcham Research, the UK motor insurers’ research centre, conducted research cited by Arup, the Motor Insurance Anti-Fraud and Theft Register from 2018 to 2020. They found that 0.001% of plug-in hybrids and 0.003% of range extended electric vehicles were subject of fire claims. That was lower than the 0.007% of petrol vehicles and 0.011% of diesel vehicles.
Arup’s new guidance, however, explains why even such rare incidents require a very different approach to fire safety because of the nature of the fires involved. An EV battery can undergo thermal runaway and is influenced by factors such as size of battery, battery chemistry and state of charge. Thermal runaway is a process within battery cells which leads to the decomposition of battery elements and can lead to the onset of fire within the battery.
battery.