https://www.ntsb.gov/news/press-releases/Pages/NR20210113.aspx https://www.ntsb.gov/news/press-releases/Pages/NR20210113.as... Risks to Emergency Responders fr

https://www.ntsb.gov/news/press-releases/Pages/NR20210113.aspx https://www.ntsb.gov/news/press-releases/Pages/NR20210113.as... Risks to Emergency Responders from High-Voltage, Lithium-Ion Battery Fires Addressed in Safety Report Actions sought by the NTSB in the four safety recommendations issued Wednesday include: Factoring the availability of a manufacturer’s emergency response guide, and its adherence to International Organization for Standardization standard 17840 and SAE International recommended practice J2990, when determining a U.S. New Car Assessment Program score. Continued research on ways to mitigate or deenergize stranded energy in high-voltage lithium-ion batteries. Continued research on ways to reduce the hazards associated with thermal runaway resulting from high-speed, high-severity crashes. Manufacturer emergency response guides modeled on ISO standard 17840 and SAE International recommended practice J2990. Incorporation of vehicle-specific information in emergency response guides for: Fighting high-voltage lithium-ion battery fires. Mitigating thermal runaway and the risk of high-voltage lithium-ion battery reignition. Mitigating risks associated with stranded energy in high-voltage lithium-ion batteries during emergency response and before a damaged electric vehicle is removed from the scene. Safely storing an electric vehicle with a damaged high-voltage lithium-ion battery. Providing information and available guidance to first responders and other crash scene workers about fire risks associated with high-voltage lithium-ion battery fires in electric vehicles. Fires in electric vehicles powered by high-voltage lithium-ion batteries pose the risk of electric shock to emergency responders from exposure to the high-voltage components of a damaged lithium-ion battery. A further risk is that damaged cells in the battery can experience thermal runaway – uncontrolled increases in temperature and pressure – which can lead to battery reignition. The risks of electric shock and battery reignition/fire arise from the “stranded” energy that remains in a damaged battery.