what causes Li-ion to fail
are two basic types of battery failures. The first may occur at a
predictable interval-per-million and be connected with a design flaw
involving the electrode, separator, electrolyte and/or manufacturing
processes. The second type of failure is random.
to do when a battery overheats
battery overheats, hisses or bulges, immediately move the device away
from people, pets and flammable materials and place it on a
non-combustible surface. If at all possible, put a disintegrating
device outdoors and let it burn out.
Li-ion fire can be handled like any other combustible fire and for
best result use a foam extinguisher, CO2, ABC dry chemical, powdered
graphite, copper powder or soda (sodium carbonate).
gas released by venting of a Li-ion cell as part of pressure buildup
is mainly carbon dioxide (CO2). Other gases that form through abusive
heating are vaporized electrolyte consisting of ethylene and/or
propylene. Burning gases include combustion products of the organic
batteries contain little lithium metal and can be dowsed with water
in case of a fire. Only non-rechargeable lithium-metal batteries
require a Class D extinguisher.
best results, use a foam extinguisher, CO2, ABC dry chemical,
powdered graphite, copper powder or soda (sodium carbonate) as you
would to extinguish any other fire.
the fire of a burning lithium-ion battery cannot be extinguished,
allow the pack to burn out on its own in a controlled and safe way.
batteries have become very safe and heat-related failures occur
rarely under correct use.
Battery knowledge and safety are important. Here is more important information on batteries from Battery University.