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| Authored by: Anonymous on Thursday, January 24 2013 @ 05:16 PM EST |
Boeing entered a new risk area when they designed the 787 system
to take more out of the battery inflight than the onboard generator
could supply, to gain reduced fuel consumption. This requires high
charge rates from external supply while the plane is on the ground
causing elevated temperatures.
Designing into new risk areas is often interesting.
Airbus are also using LiIon batteries, but with a more conservative
power management scheme.
[ Reply to This | Parent | # ]
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| Authored by: albert on Friday, January 25 2013 @ 04:00 PM EST |
New battery chemistries require fairly sophisticated load and charge monitoring.
Load monitoring is required so as not to exceed the battery rating for current
delivery, charge monitoring prevents over-charging. There are dedicated ICs
available to monitor these parameters, and others, such as temperature. These
tiny chips are often embedded in the battery pack. However, they only monitor
and report. Control of charging and load control must be done elsewhere. Even if
the charging systems are properly designed, nothing can be done to 'unshort' a
shorted battery.[ Reply to This | Parent | # ]
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