Compared with other secondary battery technology, lithium-ion battery
is lighter, cheaper, and higher energy density. It has become now the
main form of rechargeable batteries, from cell phones, laptops to cars
and various items of business jets in the use of lithium-ion batteries.
This battery has a small problem - they are not only short-circuit, also
caught fire and exploded. Consider the following Gizmodo website
introduction:
The lithium-ion battery is the reason why there
will be an explosion tendency, is called a "thermal runaway" process
(thermal runaway) to blame. In essence, "thermal runaway" is an energy
positive feedback loop process: the elevated temperature will result in
the system heats, the system heats at elevated temperatures, which in
turn, make the system more heat. Thermal runaway is a very common
phenomenon, from the concrete curing (heat) will release a large number
of physical and chemical processes of stellar explosion (supernova is a
product of cosmic thermal runaway), are likely to appear thermal
runaway.
The lithium-ion battery thermal runaway. Such as both
ends of a 9V battery is a coin bridging the tear film-like isolation of
the anode and cathode of the lithium-ion battery will cause a short
circuit, short circuit often will cause thermal breakdown. The cause of
the fire of the lithium-ion batteries also include: ambient temperature
exceeds 60 ° C, often overcharge unauthorized modification shell.
Whatever
the reason, cobalt oxide experienced this reaction are battery
chemicals. Valence Technology R & D vice president Joe La Mule (Joe
Lamoreux) explained: "If you heat the chemicals reach a certain
temperature, it begins to self-heating, and then developed into a fire
and explosion." In some case, such an organic electrolyte releasing the
pressure will cause the cell to rupture. If exposed to high temperature
environment, or is experiencing a spark, it may also will burn.
Although
this uncontrollable reaction does not happen often, but the base number
of the lithium-ion battery is too large, we feel that such incidents
often occur. For example, in 2006, almost all the major laptop
manufacturers - Apple, Hewlett-Packard, Toshiba, Lenovo, Dell and other
companies - have received a report of a small amount of battery
overheating condition recall products. Single apple a 9 report in the
recall of 1.8 million units PowerBook and iBook. More importantly, the
number of the battery size, configuration and the battery cell (cell)
will affect the intensity of thermal runaway. Small battery pack (such
as digital SLR cameras) are only a few battery power, thermal runaway
propagation from the battery unit to the other unit is relatively low.
And 787 huge battery pack is another matter: they are packed in sealed
metal box, which can not be discharged waste heat, the result is that
when a battery unit hot enough to ignite the electrolyte, and the rest
of the battery unit will quickly with into.
But you also do not
need to worry too much. Your notebook is not a ticking time bomb. To do
some maintenance on a regular basis, the lithium-ion battery will be
safe and reliable work. Lithium-ion life is not long, generally two to
three years can be maintained (whether you use it). Because of this, all
of the lithium-ion battery pack should be about every 36 months on the
replacement. Moreover, whenever the charge is reduced to 50% of the
time, you should can it enrich my knowledge. No memory effect of
lithium-ion, but the voltage is too low will make them serious damage.
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