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Electronics & Test
NTSB: Short Circuit Caused 787 Battery Fire
2/12/2013

NTSB chairman Deborah Hersman said last week that investigators have concluded that a short circuit occurred in cell number six of the pack's eight cells.   (Source: NTSB)
NTSB chairman Deborah Hersman said last week that investigators have concluded that a short circuit occurred in cell number six of the pack's eight cells.
(Source: NTSB)

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richnass
User Rank
Blogger
Re: Cause or Effect
richnass   2/12/2013 11:01:31 AM
NO RATINGS
tekochip, if I understand where you are going, is it the blame of the battery itself, or the electronics surrounding the pack. I'd be surprised if anyone takes "credit" for this mishap.

tekochip
User Rank
Platinum
Re: Cause or Effect
tekochip   2/12/2013 10:00:30 AM
NO RATINGS
I understand that, but did the cell fail from being overheated, or did it become hot because it had failed?  The folks at Tesla and others have said that this type of pack requires active cooling.  If that's true will an overheated cell fail by shorting, or was the cell poorly constructed, shorted and then caused the thermal runaway?

g_ost
User Rank
Gold
Re: Cause or Effect
g_ost   2/12/2013 9:37:37 AM
NO RATINGS

G-Yuasa at NASA Aerospace Battery Workshop 2011/November 15, 2011

https://batteryworkshop.msfc.nasa.gov/presentations/04_Qualification%20of%20GS%20Yuasa%20Large%20Format%20Li-ion%20Cells%20for%20Space.pdf

the cell presented is not the one from 787 but the technology should be similar.

The 787 battery pack has 8 cells serial hard connected. The cells can not be individual switched off in case of failure. The damaged cell still getting power from the good cells and aggravate the issue.

tekochip
User Rank
Platinum
Cause or Effect
tekochip   2/12/2013 8:29:25 AM
The classic question.  Was it a manufacturing problem in the battery pack that caused the cell to short or did the pack overheat and then a cell failed, as so many people looking from the outside have suggested?

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