Why Did This smart#1 EV Catch Fire While Parked At Home

Lets see what the manufacturer will share with the media after this smart#1 caught on fire under the house porch

Recently, an incident involving a smart#1 Electric car raised concerns on social media as the vehicle caught fire while parked in its owner’s car porch. 

Needless to say, this type of news quickly attracts attention, especially when it comes to electric vehicles. The image of a vehicle in flames can strike the imagination… but what is the reality?

The EV lovers will say …..

1. ‘Ah Long’ or money lender set the car on fire
2. Charging point was not wired up properly
3. EV was charging using 3 pin plug that overheated

Non EV lovers will say ……

1. EV battery catches fire easily
2. EV’s are dangerous and point at the possibility of the whole neighbourhood catching fire
3. EV fires take a long time to extinguish and water does not work so you need professional equipment from the Bomba 

An electric car that suddenly catches fire while parked, even when not charging, typically does so due to thermal runaway within the lithium-ion battery pack, initiated by an internal short circuit. The primary causes of this can be a manufacturing defect, prior physical damage, or, rarely, extreme external heat. 

We have to look at the possibility of manufacturing defects which could be one of the main reasons for a spontaneous fire in a parked EV. Errors during the battery cell production, such as contaminants or flawed components, can compromise the internal structure and lead to an internal short circuit.

Lets not discount a possible physical damage to the battery pack from a previous collision, driving over road debris, or even floodwater submersion might not cause an immediate fire but can weaken the battery’s safety layers. This can lead to a short circuit and subsequent thermal runaway hours, days, or even weeks later when the vehicle is parked.

Then there is internal short circuit which could happen between the battery’s anode and cathode which can generate intense heat. If the vehicle’s thermal management or battery management system (BMS) fails to dissipate this heat, it can trigger a chain reaction (thermal runaway) where one cell ignites its neighbours.

While rare in modern EVs with good thermal management systems, exposure to very high ambient temperatures (e.g., parking in direct sunlight in extreme climates) can raise the battery temperature, increasing the risk of thermal runaway, especially if the battery is near a high state of charge. 

Have you heard of thermal runaway? This is the core phenomenon. When a battery cell overheats, internal chemical reactions generate more heat and flammable gases. This heat spreads to adjacent cells, causing a chain reaction that results in a large, difficult-to-extinguish fire.

While some fires occur during or shortly after charging (often due to non-compliant chargers or existing faults), a fire can still happen while parked and off because the damage or defect has already initiated a slow-burning reaction that eventually reaches the critical thermal runaway point. 

EV fires are statistically much less frequent than those in petrol pr diesel-powered vehicles, but when they do occur, they present unique challenges for firefighters due to the nature of lithium-ion battery fires and the risk of re-ignition.