Lithium-ion batteries (LIBs) have become a cornerstone of modern technology, powering everything from mobile IoT devices and home appliances to large-scale energy storage systems and electric vehicles. With recent advancements, these batteries now offer higher performance and greater capacity, enabling their use in an expanding range of applications.
However, alongside these benefits come significant risks that must be carefully managed. The potential dangers associated with lithium-ion batteries, particularly the risk of heat generation or ignition, pose serious concerns.
The Risks Inherent in Lithium-Ion Batteries
Lithium-ion batteries are inherently sensitive to various environmental and operational conditions. If exposed to improper charging, short circuits, excessive vibration, mechanical shocks, or extreme temperatures, they can experience severe issues that may lead to dangerous outcomes.
The root of these problems often lies in the electrolyte within the battery. This electrolyte can rapidly increase in temperature when subjected to external stresses, such as elevated ambient temperature or high pressure, potentially triggering a series of hazardous events.
One of the most critical dangers associated with lithium-ion batteries is thermal runaway. This self-sustaining reaction occurs when the temperature inside the battery reaches a critical point during charging, discharging, or due to other failures.
Once thermal runaway begins, it can quickly spiral out of control, rapidly releasing energy in the form of heat. This can result in fires or even explosions, especially if the battery is not adequately contained.
In addition to thermal runaway, other risks include electrolyte leaks and the leakage of gases produced under abnormal conditions. As the inner pressure of a lithium-ion battery increases, gases such as hydrogen (H2), carbon monoxide (CO), methane (CH4), carbon dioxide (CO2), and various volatile organic compounds (VOCs) can be released.
These gases are by-products of the organic solvents used in the battery’s electrolyte and can be highly flammable or toxic, further compounding the danger in the event of a battery failure.
The Importance of Safety Measures
Given the potential for severe accidents, it is crucial to implement robust safety measures when using, storing, or transporting lithium-ion batteries.
UK Legislation does not yet specifically cover lithium-ion batteries, but research from Bristol University has set out helpful guidelines.
One of the most effective ways to mitigate these risks is by incorporating gas sensors into the safety systems of devices that utilise lithium-ion batteries. These sensors can detect the presence of dangerous gases produced by the battery under abnormal conditions, even in remote or unattended locations.
For instance, hydrogen (H2) sensors can detect the presence of hydrogen gas, which is highly flammable and can pose an explosion risk. Carbon monoxide (CO) sensors monitor for the release of CO, a toxic gas that can be deadly in high concentrations. VOC sensors can detect volatile organic compounds, which are often early indicators of battery failure. Carbon dioxide (CO2) sensors can provide further insights into the battery’s state, as CO2 is another gas commonly produced during thermal runaway or other critical failures.
Conclusion
While the advancements in lithium-ion battery technology have brought about remarkable improvements in performance and capacity, they have also introduced new safety challenges. The risks of thermal runaway, electrolyte leaks, and gas emissions highlight the importance of rigorous safety protocols and the integration of advanced detection systems.
By incorporating sensors to monitor for the early signs of battery failure, we can significantly reduce the likelihood of catastrophic accidents, ensuring that the benefits of lithium-ion batteries can be fully realized without compromising safety.
Contact Omnisensors and Transmitters for further information on the gas sensors and modules mentioned.
