Battery in 787 swollen from overheating, official says - Page 9 - RC Groups
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Feb 05, 2013, 12:27 PM
jrb
jrb
Member
jrb's Avatar
As in a battery from a B777; or, A340.
Feb 05, 2013, 12:30 PM
Registered User
pilotpete2's Avatar
Problem is, they wouldn't fit in the allotted space
The focus now is on the battery management systems, not the cells.
Hopefully the FAA will act immediately in approving a resumption of flight tests, as requested. That would go along way to getting to the bottom of the problem.
Pete
Feb 05, 2013, 01:26 PM
KlonWarz
Quote:
Originally Posted by jrb
As in a battery from a B777; or, A340.
:-)
Trying to get an engineer to standardize would be an exercise in futility!
:-)

rc
Feb 06, 2013, 06:09 AM
Official Old Git!
The great thing about standards... is that there are so many you can choose from...
Feb 06, 2013, 08:02 AM
Suspended Account
Quote:
Originally Posted by Norman Adlam
The great thing about standards... is that there are so many you can choose from...
As they say at airbus, wee,wee.
Feb 06, 2013, 11:56 AM
Not THAT Ira
Real Ira's Avatar
Quote:
Originally Posted by jrb
Wonder why they don't back to a NiXx based battery just to get flying again?
Because Chevron/Texaco has fought like cornered animals in international courts to keep large cell NiMH batteries out of production and sued the crap out of anyone who even thinks about using them.
They are waaay to easy to work with compared to LiPos and would pose a serious threat of simple and cheap electric cars being produced even in third world countries.
Feb 06, 2013, 03:25 PM
Random Pic #23982
Indiana_Geoff's Avatar
Quote:
Originally Posted by madsci_guy
So for your house:

Structure.
Water
Electricity
Gas
Sewer
Heater
Stove. (And I'm being generous calling a stove a "system").
Air conditioning
Computer
And in a house, anyone one system can fail and not bring down every other system and it can be repaired. The vast majority of the failures have no ill effects once identified and isolated. On a plane in operation, not so much.
Feb 15, 2013, 11:34 AM
Alarm Bells Softening!
Big Foot 48's Avatar
Airbus moves to avoid the issue:
Quote:
Airbus has started informing airlines that have ordered the new A350 that the new plane will have Nickel-Cadmium batteries, rather than lithium-ion batteries, the European plane maker told CNBC Thursday.

Airbus said the move is based entirely on reducing uncertainty in the program schedule -- not due to any safety concerns.
http://www.nbcnews.com/business/airb...anes-1C8392066
Feb 20, 2013, 07:21 PM
Figure Nine Champ
madsci_guy's Avatar
http://www.cnn.com/2013/02/20/travel...Most+Recent%29

Quote:
Washington (CNN) -- Boeing will present a temporary plan to U.S. aviation safety officials this week aimed at getting its grounded 787 Dreamliners back in service.
Feb 20, 2013, 07:51 PM
Registered User
pilotpete2's Avatar
This really is interesting. Maybe an explanation of why these batteries were failing

http://www.usnews.com/news/business/...ng-787-battery
Pete
Feb 20, 2013, 10:43 PM
KlonWarz
So does it sound like crossed polarity even though a rectifier bridge was in place?
Feb 21, 2013, 09:24 AM
Sweeper Nut
Sweeper Nut's Avatar
Thanks for the update guy's. This is interesting stuff.
Feb 21, 2013, 10:48 AM
Will it ever Fly?
Flybynight2's Avatar

AC Batteries


These are "NiCad" batteries, made up of individual plastic cells. Placed in a metal container.
I used to work in a place that "conditioned" these batteries. The conditioning was to make each cell the same. (Kind of what you do by balancing your Lypos).
If one cell gets more charged, it burns through the side and into another cell. Then the two cell short and draw a lot of power from the other cells and Puff you have a chemical fire.
I had about one to two a month do that while on the conditioning table.
I would grab it and run out the door and run the water hose on it. With full stream it would just contain the fire, but not put it out until all the energy was spent.
Nasty strange smell, I still can walk into a building hours afterward and tell if one has caught fire.
Mar 18, 2013, 09:02 AM
jrb
jrb
Member
jrb's Avatar
Boeing to patch up 787 batteries

As the world watches and waits for Boeing’s revolutionary Dreamliner to soar into the skies again (no pressure), the latest word from the manufacturer on its titanic struggle with lithium-ion (Li-ion) battery technology is a thesis-like statement which details “a comprehensive set of safety improvements”.

The changes Boeing will make to the Li-ion technology, under an FAA-approved plan, are indeed wide-ranging and will include alterations to the battery itself, the battery charging unit and the battery installation, plus adjustments to production and operating processes.

"Passengers can be assured that we have completed a thorough review of the battery system and made numerous improvements that we believe will make it a safer, more reliable battery system,” commented Ray Conner, president and CEO, Boeing Commercial Airplanes.

In its statement of March 14, 2013, Boeing eagerly listed the specific improvements it will introduce: enhanced production standards and tests to reduce the possibility of variation in the individual cells and the overall battery; a narrowing of the acceptable level of charge for the battery – both a decrease in the highest permissible charge and an increase in the lower level allowed for discharge; and a softening of the charging cycle to lighten the stress on the battery during charging. But it doesn’t stop there -

Boeing will also introduce: enhanced insulation of the battery cells from each other and from the battery box; an upgrade of the wire sleeving and wiring inside the battery for greater resistance to heat and chafing; new fasteners attaching the metallic bars between the battery cells which will include a locking mechanism; and changes to the battery case including small holes which will allow a failed battery to vent with less impact to other parts of the battery. But it doesn’t stop there -

Boeing will also introduce: a stainless steel enclosure which will isolate the battery from the rest of the gear in the electronic equipment bays and prevent fire; and new titanium fixtures in the electronics equipment bays to ensure that the housing is properly supported.

Great, but - what exactly was the problem with the batteries?

On this point, Boeing merely says - in rather circular fashion - that the enhancements to the battery system address “causal factors” identified by its technical team as “possible causes of battery failure”. These findings have apparently been verified by an independent cross-section of external Li-ion experts.

But are “enhancements” a solution? On the one hand, the proposed battery adjustments sound reassuringly comprehensive - but on the other hand, without a definitive diagnosis of the problem afflicting Boeing’s wounded flagship they could look a lot like sticking plasters.

Joanne Perry, Online Editor, UBM Aviation
Mar 24, 2013, 11:10 PM
Culper Junior
Are these airplanes still grounded???


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