Can thermal runaway lead to fire in lithium batteries?

What Causes Thermal Runaway in Lithium Batteries?

Thermal runaway in lithium batteries is typically caused by a combination of high temperatures and internal chemical reactions. When a lithium battery is subjected to high temperatures, the electrolyte inside the battery can break down, releasing ions that react with the electrodes to produce heat. This heat can cause a chain reaction, leading to a rapid increase in temperature, which can eventually cause a fire.

How to Prevent Thermal Runaway in Lithium Batteries

Preventing thermal runaway in lithium batteries requires careful management of temperature and electrical currents. One technique is to use a battery management system (BMS) that monitors the battery’s temperature and electrical currents in real-time. A BMS can detect when the battery is approaching a critical temperature and take corrective action, such as disconnecting the electrical connection, to prevent thermal runaway. Additionally, using a temperature-controlled environment and following proper charging and discharging procedures can also help prevent thermal runaway.

What Happens During a Thermal Runaway Event?

During a thermal runaway event, the rapid release of heat can cause a chemical reaction that produces flammable gases, such as hydrogen and methane. These gases can ignite, causing a fire. In severe cases, the fire can be so intense that it can cause a catastrophic failure of the battery, releasing toxic chemicals into the environment. To mitigate this risk, it’s essential to design and manufacture lithium batteries with thermal runaway prevention features, such as thermal cut-offs and pressure relief valves, and to follow strict safety protocols when handling and storing these batteries.