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SAFETY4SEA

TT Club: The various dangers associated with lithium-ion batteries

by The Editorial Team
September 18, 2023
in Loss Prevention
TT Club: The various dangers associated with lithium-ion batteries

Credit: Shutterstock

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TT Club is emphasizing the critical dangers of lithium-ion batteries, including that of toxic gas emissions associated with lithium-ion battery fires.

As TT Club explains, failure of these batteries can occur with no prior warning or at such a rapid pace that there is typically no time to react to any warning signs. The devastating consequences of rapidly spreading and often challenging to extinguish fires involving the batteries, particularly in electric vehicles (EV) on board ships and other parts of the supply chain, have been well documented in recent months.

Toxic vapours 

The issue of lithium-ion battery fires is gaining widespread recognition, prompting the industry to take action in order to address and mitigate this phenomenon.

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However, according to TT Club, there appears to be a concerning lack of awareness regarding the harmful effects of highly toxic combustion products and their impact on the health and wellbeing of individuals exposed to these gases.

In many common supply chain scenarios, including ships’ holds and warehouses, the reality is that such vapour clouds are likely to accumulate. Even when the clouds are able to disperse, the potential toxic effects may occur at lower concentrations.

… explains Neil Dalus of TT

Drivers, stevedores, ships’ crews and first responders attempting to control the blazes encounter what might appear to be smoke but is in fact a mix of toxic gases, generated quickly and in large volumes. These gases once in the atmosphere behave differently to smoke, often pooling at floor level due to their density.

Traditionally where fires and smoke are concerned one would stay low to avoid inhalation, doing so where lithium battery fires are concerned is likely to prove problematic

… observes Neil Dalus.

The toxicity of gases given off from any given lithium-ion battery differ from that of a typical fire and can themselves vary but all remain either poisonous or combustible, or both.

They can feature high percentages of hydrogen, and compounds of hydrogen, including hydrogen fluoride, hydrogen chloride and hydrogen cyanide, as well as carbon monoxide, sulphur dioxide and methane among other dangerous chemicals.

In terms of hazards to the wellbeing of those in the vicinity of such an incident, one particularly problematic component is hydrogen fluoride (HF). Although HF is lighter than air and would disperse when released, a cloud of vapor and aerosol that is heavier than air may be formed (EPA 1993).

On exposure to skin or by inhaling, HF can result in skin burns and lung damage that can take time (hours to weeks) to develop following exposure. HF will be quickly absorbed by the body via skin and lungs depleting vital calcium and magnesium levels in tissues, which can result in severe and possibly fatal systemic effects. The hydrogen content of the released gases can give rise to vapour cloud explosion risks which have the potential to cause significant damage.

Potential vapour volume production
Source: Journal of Loss Prevention in the Process Industries 80 (2022)

Thermal runaway

The time between the initiation of a failed battery igniting and the discharge of toxic vapour can be measured in seconds rather than minutes due to a process known as thermal runaway.

This rapid sequence of events typically occurs when an internal electrical short within one of the battery cells generates heat, which breaks down the internal structure of the battery, increasing the rate of the reaction in an ever-increasing cycle. There is often a dramatic release of energy in the form of heat and a significant emission of toxic gases.

Mitigating risks 

TT advocates a range of measures to mitigate the risks. A prudent starting point, TT finds, would be to perform a fire risk assessment, considering the specific hazards presented by lithium-ion batteries.

Risk mitigation considerations thereafter could also include:

#1 Proper equipment 

An important step is providing operatives with certified full-face self-contained breathing apparatus, chemical-resistant boots among other protective equipment, as well as drench showers for post-response decontamination.

Strategic positioning of fire-fighting equipment should also be a key consideration.

#2 Camera and thermal imaging

Early detection of such an incident can also be pivotal in managing the response, camera and thermal imaging could enable an expedient response. Such equipment might have already become commonplace for some modes, however conducting a thorough risk assessment for example when cargo is stored in warehouses would be prudent.

Given the hazardous nature of this vapour, if any of these measures are not in place then the best course of action is to evacuate the area and leave the incident response to the emergency services, ensuring that the known risks are appropriately communicated.

… added Neils Dalus

#3 Post-incident clean up 

Consideration should also be given to the location of any incident that might include clean up and entry. The gases produced potentially leave toxic deposits on all surfaces and in the atmosphere. Therefore, once the incident is under control, potential hazards remain.

Early detection of such incidents can also be pivotal in managing the response, and consideration should be given to the location of any incident that might include clean-up and entry, TT highlights.

Further mitigation measures regarding transporting lithium-ion batteries can be found in UK P&I Club and TT Club’s lithium Batteries whitepaper. 

 

Tags: batteriesInfographicloss preventionsafety meausuresTT Club
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