|
|
|
Discussion
Battery in 787 swollen from overheating, official says |
|
|
|
|
|
this the 3rd battery issue they have had im betting a bad batch or some one ordered from HK lol
but really seems like a bad batch of batteries any one know what chemistry they are using? DERP its in the story they are Li-Ion huh im going to say its a bad batch OR there charging circuit sucks |
|
|
|
|
|
The 787 has two rather large Li-Ion batteries, one in the forward EE compartment, one in the rear with the APU. Since the plane does not use engine bleed air for air conditioning / heating / de-icing (except for the engines themself), but does almost everything electric the needed power levels are rather high. The APU has two 225 kVA generators and the batteries have to compensate in case of failure.
The batteries are made by Yuasa: http://www.gsyuasa-lp.com/aviation-lithium-batteries Spec sheets: http://www.s399157097.onlinehome.us/...s/LVP10-65.pdf From their spec sheet they seem to use a lithium cobalt cathode based cell chemistry. I don't know about the electrolyte but I suspect it to be lithium hexafluorophosphate based. (Rather similar to lipos for hobby purposes btw Good energy density but its comes with a price...) The trouble - so I believe - is that this type of battery chemistry is not known to be self limiting in case of failure. In case of separator failure, overcharging or overheating it can sustain a thermal runaway resulting in the self destruction of the battery with fire and (toxic) smoke. In hindsight maybe it would have been better if they had used LiFePO4/ LiFeYPO4 batteries. Maybe not quite the energy density but safer. |
|
|
|
|
|
LOL
Hmm. This is making me rethink my commute. I drive a Nissan Leaf, so I'm sitting on about 500 pounds of LiIon batteries. The car has seat warmers, but now I'm wondering if they could go into turbo mode. Why didn't someone warn me that Lipos could go up in flames before I bought this car? Dan |
|
|
|
||
|
using APUs for primary power where have i heard that be for...
OH RIGHT the shuttle and they had all kinds of issues with the APUs (mind you Shuttles APUs ran on Hydrazine lol) but using an APU as primary power seems to be asking for trouble not sure whats worse hydrazine fire or Li fire? yes i know the 787s APU runs on JP-1 from that site that was linked Quote:
|
|
|
Last edited by Elios000; Jan 17, 2013 at 10:25 AM.
|
|
|
|
|
The 787 has twice the number of generators as traditional designs and they're double the wattage of those on a 777. Each engine has 2X 250kW generators, as does the APU, for a total of 6 generators. The total of four generators on the engines are the primary power source and provide a lot of redundancy.
The battery that caught fire in Boston was the starter battery for the APU. Pete |
|
|
|
|
|
The batteries in the 787 are backup power, thats right.
But this is not a just puffed battery with a little discoloration of its paint. If the battery company say this is just "swollen" I would not want to see what a burnt one looks like: http://www.nycaviation.com/2013/01/n...g-787-battery/ In case of a fire in the forward EE compartment no amount backup power will help you. One of the Common Core Resource cabinets is a few inches away (the "brain" of the plane). The SOP in this case will be to land as fast as possible. |
|
|
|
|
|
Did Boeing send (1) a photo? (2) a video? (3) a signed letter from "mother?"
|
|
|
Thread Tools | |
Similar Threads | |||||
Category | Thread | Thread Starter | Forum | Replies | Last Post |
Discussion | FBI, DEA thwart terror plot in U.S. involving Iran, officials say | Michael in Toronto | Life, The Universe, and Politics | 80 | Oct 14, 2011 07:28 PM |
New Battery Technology - Scientists say paper battery could be in the works | Bombay | Batteries and Chargers | 10 | Dec 09, 2009 08:04 AM | |
Official Announcement from AirThunder Li-Poly Battery, LLC | barryhu | Batteries and Chargers | 2 | Nov 22, 2007 02:02 AM | |
Discussion | uce-bestbuy, site says they are in Calif but they ship from China ???? | rcer2007 | Electric Plane Talk | 8 | Sep 19, 2007 08:56 PM |
Swollen LiPo 1500Mah Battery. | GeorgeZilla | Pusher Prop Jet Models | 6 | Jun 12, 2005 07:34 PM |