Airbus announces it will not use Lithium batteries in upcoming model

[Dg800]

...but will instead fall back on the older and proven nickel-cadmium technology.

Airbus Abandons Plan to Use Controversial Batteries in New Jet - New York Times (http://www.nytimes.com/2013/02/16/business/global/airbus-abandons-plan-to-use-controversial-batteries.html)

[RR_NDB]

Hi,

Wise move from EADS.

:ok:

[RR_NDB]

Hi,

Here a model that can quite easily explain ANA 787 case:

1) Thermal runaway (similar as happened in Logan)
2) Heavy battery discharge. A fact! To fuse the ground wire you has to.
3) Battery was "turned off"*. (fluctuated and suddenly went to zero)
4) No external fire (MAIN battery pictures confirm this fact)
5) Smoke. (a lot of, even ATC saw it)

Again,

If short circuit to ground (12 volts at cell # 3) didn´t happen, battery likely would caught fire. Stored energy would be higher.

This would be much worse than JAL BOS ground fire.

Why?

1) Plane was still climbing. I would take many "long" minutes with intense heat and a fire inside FWD EEbay with certainly important electronics nearby.

2) Landing and evacuation would be required in much more difficult conditions.

Well, models can resist (or not). This model is being questioned all the time to see if it´s valid, partially valid or not at all.

(*) Due inter cell connection (# 3 to # 4) opening.

:8

PS

Question?

Why ANA 787 battery didn´t caught fire?

[RR_NDB]

Hi,

In another thread it was presented the idea to use relay(s) in the battery.

And it was confirmed as feasible. :mad: (http://www.pprune.org/rumours-news/505455-faa-grounds-787s-41.html#post7695476)

Just curious:

How many cells will be required?

How many relays will be used?

What kind of relay would be used?

What´s the maximum current in the contacts? 300 A, 1000 A?

Where the relays could be located?

What will be the case volume required to have the proper relay(s)?

They would remain energized in normal condition? (N.O. or N.C.) ?

The relay coil source will come from where?

The MTBF of the relay(s) were considered? (compared to the cell MTBF)

Few dollars means less than ten, Right?

Could someone indicate one supplier of the selected relay costing "few dollars".

The battery with "relays" how much will cost, typically?

Final question:

With the use of relay(s) what´s the objective? To improve the battery?

:mad:

[CasperFan]

And plans to abandon Bleed Air :ugh:, the real B-787 interesting feature?

[RR_NDB]

Hi,

CasperFan

And plans to abandon Bleed Air (http://www.pprune.org/tech-log/508100-airbus-announces-will-not-use-lithium-batteries-upcoming-model.html#post7697301)

Please, source of info. Link?

[TURIN]

RR.
This was covered in all the other threads.
787 only uses bleed air for engine nacelle/compressor inlet anti-ice.

[Kiskaloo]

Airbus is early enough in the process that they can make the switch prior to starting certification and it saves them from having to adapt to any new special conditions that arise out of the 787 investigation.

[RR_NDB]

Hi,

TURIN:

787 only uses bleed air for engine nacelle/compressor inlet anti-ice. (http://www.pprune.org/tech-log/508100-airbus-announces-will-not-use-lithium-batteries-upcoming-model.html#post7699744)

Yes, i did know. What is new to me is A350 maintaining "conventional bleed".

EADS actually, abandoned:

Rather than the bleedless configuration used on the Boeing 787, Airbus has confirmed that it will further develop a full bleed air system on the engines.Rolls-Royce has agreed with Airbus to supply a new variant of the Trent engine for the A350 XWB, currently called the Trent XWB.
(http://en.wikipedia.org/wiki/Airbus_A350)

So, the design then redesign is not the best climate for R&D. ATIS from A to Z, :} in short time. :{

Kiskaloo:

EADS will be able to optimize looking to the fast moving scenario.