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Electronics & Test

NTSB: Short Circuit Caused 787 Battery Fire

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curious_device
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Gold
Battery mess.
curious_device   2/19/2013 4:30:08 PM
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I saw a graphic that Boeing was going to stick a vented containment around the existing battery box.  I doubt that will satisfy the FAA and NTSB. Aside of the whole qualification time lag, why wouldn't they swap the Lion battery units with NiMH-based assemblies?  Since they seem to have the space to put a box around the existing box, they could definitely go to a lower energy density battery technology.

Connector
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Iron
Cause or Effect
Connector   2/20/2013 12:49:30 AM
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Of course, an active cooling system will add weight and take up space.  That is probably why Boeing chose not to incorporate it.

g_ost
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Gold
Re: Battery mess.
g_ost   2/21/2013 7:55:39 AM
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"The gaps between the cells will be increased." as immediate solution will allow a breathing space for further improvements. SAFT mentions in their battery manual:

"Un espace de 30 à 50mm doit être laissé libre sous les modules pour permettre la désoperculation des éléments en cas de problème."

Google translation - I love this tool

A space of 30 to 50 mm must be left in the modules to allow uncapping elements in case of problems.

The problem still exist but this short solution will reduce the cascade effect in case of a cell failure and will improve the local cooling - trough enhanced sufrace contact with  the air environment.

Charles Murray
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Blogger
Re: Battery mess.
Charles Murray   2/21/2013 1:12:07 PM
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Another story came out yesterday, saying that Boeing intends to provide more space between cells. It's worth mentioning, however, that Boeing's spokespeople are not commenting, so we don't know for sure.

http://www.reuters.com/article/2013/02/20/us-boeing-dreamliner-battery-idUSBRE91J0VG20130220

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