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A whitepaper published by Charged EVs examines thermal runaway in lithium-ion batteries, the self-heating failure mode that can cause fires in EV packs. The guide reviews causes, risk levels, and containment solutions including silicone syntactic foams.
A newly published guide from Charged EVs examines thermal runaway — the self-heating failure mode in lithium-ion battery cells that can lead to fires and, in severe cases, explosion — and lays out current approaches to preventing and containing it in the electric vehicle industry. The whitepaper comes as EV adoption accelerates and public attention to battery safety intensifies.
According to the report, thermal runaway begins when a battery cell overheats and reaches a critical temperature, triggering a self-heating reaction that the cell can no longer dissipate. Once started, the reaction can cascade through a battery pack, causing what the guide describes as catastrophic failure, fires and potentially explosion.
The whitepaper addresses a question frequently raised by the public: whether EVs are more prone to catching fire than fossil-fuelled vehicles. The authors frame this as a central point of inquiry, examining the actual statistical risk of an electric vehicle fire rather than treating the hazard as self-evident. The guide does not claim EVs are inherently more dangerous; instead it positions thermal runaway as a manageable engineering problem requiring robust safety measures and appropriate materials.
On solutions, the report evaluates a range of options for both prevention and containment, with particular focus on how silicone syntactic foams — lightweight materials that can be placed between or around cells — can reduce the likelihood of thermal runaway propagating and lessen its consequences when a single cell fails.
Why Battery Failure Safety Matters Now
The electrification of transport is accelerating globally, putting millions of large lithium-ion battery packs on roads, in depots and in homes. According to the Charged EVs report, the risks associated with thermal runaway have gained heightened public attention as a result, making battery safety a factor in consumer confidence and regulatory scrutiny alike.
The guide’s focus on materials-level mitigation also matters commercially: the difference between a single-cell failure contained by inter-cell barriers and a full pack-level fire determines recall costs, insurance exposure and brand reputation for EV manufacturers. Containment solutions such as silicone syntactic foams represent one engineering pathway to keep single-cell faults from escalating.
How Thermal Runaway Develops
: “Thermal runaway is a chain reaction inside a lithium-ion cell. As the report explains, when a cell overheats — whether from internal defects, external damage, overcharging or extreme ambient conditions — and passes a critical temperature threshold, its internal chemistry begins to generate more heat than it releases. The temperature climbs, reactions accelerate, and the cell can vent flammable gases, ignite or rupture.
In a multi-cell EV pack, the failure of one cell can heat neighbouring cells past their own thresholds, a process known as propagation. Preventing that propagation between cells is the central goal of the containment materials and design strategies the whitepaper evaluates, alongside the development of strong safety protocols across the industry.
“If a battery cell overheats and reaches a critical temperature, it can trigger a self-heating reaction that can lead to catastrophic failure, fires and even explosion.”
— Charged EVs whitepaper
Questions the Guide Leaves Open
The publicly available summary of the whitepaper does not include the specific statistical comparison of EV fire rates versus fossil-fuelled vehicle fire rates, and the question of whether EVs are more dangerous is posed rather than answered in the accessible text. Readers must access the full report for those figures.
Performance claims for silicone syntactic foams — such as the degree of temperature reduction or propagation resistance achieved — are attributed to the report’s sponsors and are not independently verified here. It is also not yet clear how widely these materials have been adopted in production EV packs, or what they add to pack cost and weight.
Where Battery Safety Engineering Goes
The whitepaper is released alongside a Virtual Conference on EV Engineering scheduled for September 14–17, 2026, with free registration for live or on-demand sessions, according to Charged EVs. Topics of this kind are expected to feature in that program.
More broadly, the industry trajectory the report describes points toward continued development of cell-to-pack containment materials, improved safety protocols and stronger testing standards. Readers who own an EV or hybrid can also check for open recalls, including battery-related recalls, through the NHTSA recall lookup at nhtsa.gov/recalls.
Key Questions
What is thermal runaway in a lithium-ion battery?
According to the Charged EVs guide, thermal runaway occurs when a cell overheats and reaches a critical temperature, triggering a self-heating reaction that can no longer be dissipated, potentially leading to fire or explosion.
Are electric vehicles more likely to catch fire than petrol or diesel cars?
The whitepaper poses this question directly but the publicly available summary does not provide the comparative statistics. Any comparison should rely on the full report’s data or independent fire-service statistics.
What causes a battery cell to enter thermal runaway?
Reported causes include internal manufacturing defects, physical damage, overcharging and excessive heat. The common factor is that the cell reaches a temperature at which internal reactions generate more heat than the cell can release.
How can thermal runaway be prevented or contained?
The guide evaluates prevention measures and containment strategies, with particular focus on silicone syntactic foams placed between cells to stop heat propagation from a failed cell to its neighbours.
What should EV owners do about battery safety?
Owners should follow manufacturer charging guidance, avoid physical damage to the pack and check for open recalls — including battery recalls — via the NHTSA recall lookup. Any suspected battery or high-voltage system fault should be handled by a certified technician, not a home repair.
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