The Lesson From Flaming Luxury Cars

The fire on the carrier ship Felicity Ace, carrying many luxury cars including electric cars, has prompted us all to have another look at how we store and use lithium batteries. It is not clear if the lithium batteries in the electric vehicles started the fire and, given the extreme temperatures burning lithium batteries generate, there may be no evidence to assist us find the cause.  What was reported was that the lithium batteries were making the fire a lot more difficult to extinguish. What can we learn from this incident?

The Felicity Ace Implodes

Carrying 3,965 Porsche, Lamborghini, Audi and Bentley cars at a value of around $US330M, the Felicity Ace caught fire in the Atlantic Ocean in February this year. Luckily, all 22 crew members were safely rescued but the abandoned ship was left drifting and burned for over a week before recovery teams could board. It ran aground while being towed to safety and finally sank beneath the surface of the Atlantic Ocean. Whilst the initial cause of the fire hasn’t been established, it’s clear that the Lithium-ion batteries in the electric vehicles on board helped keep the fire alive.

Lithium Batteries In Use

One ingredient in Lithium batteries is highly flammable, and if the temperature rises above a certain point, it can experience thermal runaway, emit dangerous toxic smoke vapours and can explode.  Subsequent reignition is possible due to lingering toxic, flammable vapours in the air.  Fires which ignite from these highly condensed energy battery packs burn longer and stronger than non-electric car fires.  They are much harder to extinguish, take more smothering agents to extinguish, and can potentially melt the entire metal frame of the car. 

Lithium batteries are also widely used in homes and a new standard was introduced in 2019, AS/NZ 5139 2019, which provides a set of rules designed specifically to guide the safe installation of residential battery storage systems. It details seven hazard categories and more than 110 risk management factors that need to be considered when installing residential battery storage. 

Lithium Batteries In The Workplace

The batteries are also used in workplaces in small and wearable electronic devices that rely on a power source that stores a high amount of energy in a small space. Lithium cells provide sustained power and often have the capability to recharge. 

Interestingly, Australia is the largest producer in the world of lithium, contributing up to 50% of the world’s lithium mine/concentrate. However, we basically dig for the raw materials and ship them overseas for refining, cell production and battery assembly. 

Hazards and Risks

In February 2018, the U.S. Consumer Product Safety Commission’s Status Report on High Energy Density Batteries Project reported over 25,000 overheating or fire incidents involving more than 400 types of lithium battery powered consumer products that occurred over a five-year period, so the hazard is well established.

We need more information to quantify risk. The US Occupational Health and Safety Administration reports that lithium batteries are generally safe and unlikely to fail so long as there are no defects or damage. When lithium batteries fail to operate safely or are damaged, they may present a fire and/or explosion hazard. Damage from improper use, storage, or charging may also cause lithium batteries to fail.  So controls are warranted.

Suggested Controls

The US Occupational Health and Safety Administration recommends:

• Testing batteries, chargers, and associated equipment in accordance with an appropriate test standard
• On receipt of batteries checking for defects in design, manufacturing, and material quality and checking they are rated for their intended use 
• Testing of lithium batteries, chargers, and associated equipment to an appropriate test standard
• Following manufacturer’s storage, use, charging, and maintenance instructions
• Ensuring replacement batteries and chargers for an electronic device are specifically designed and approved for use with the device and are purchased from the device’s manufacturer or a manufacturer authorized reseller
• Removing lithium-powered devices and batteries from the charger once they are fully charged
• Storing lithium batteries and devices in dry, cool locations
• Avoiding damaging lithium batteries and devices. Inspect them for signs of damage, such as bulging/cracking, hissing, leaking, rising temperature, and smoking before use, especially if they are wearable. Immediately remove a device or battery from service and place it in an area away from flammable materials if any of these signs are present.
• If batteries are damaged, remove them from service, place in fire resistant container (e.g., metal drum) with sand or other extinguishing agent, and dispose in accordance with local, state, and federal regulations. Contact a local battery recycling centre for disposal instructions.
• Follow manufacturer’s guidance on extinguishing small battery fires, e.g. using: ABC dry chemical extinguishers, Class D fire extinguishers (for lithium-metal), dirt, or sand.