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7th Feb 2013, 13:33
Replies: 2,186
Views: 892,200
Posted By hetfield

http://www.mlit.go.jp/jtsb/flash/JA804A_130116-130...

http://www.mlit.go.jp/jtsb/flash/JA804A_130116-130205.pdf

Page 5?
7th Feb 2013, 10:06
Replies: 2,186
Views: 892,200
Posted By hetfield

@cockney steve Yes, the eight "cells" of the...

@cockney steve

Yes, the eight "cells" of the 787 battery contain each 6 sub-cells in parallel.
Paralleling increases capacity. So each sub-cell has about 11Ah makes roughly the nominated 65Ah....
Forum: Tech Log
6th Feb 2013, 18:33
Replies: 14
Views: 2,286
Posted By hetfield

@Bula YOUR ARE THE PILOT! There are...

@Bula

YOUR ARE THE PILOT!

There are several knobs on 321 to make it work like YOU want!
Forum: Tech Log
6th Feb 2013, 13:59
Replies: 1,100
Views: 168,875
Posted By hetfield

755 must be a typo...

755 must be a typo...
6th Feb 2013, 13:17
Replies: 2,186
Views: 892,200
Posted By hetfield

@mikkojuha At least, I don't know Li-Ion...

@mikkojuha

At least, I don't know Li-Ion cells (one cell) which has 65Ah....
6th Feb 2013, 09:12
Replies: 2,186
Views: 892,200
Posted By hetfield

Yep, some pilots are also engineers with a...

Yep, some pilots are also engineers with a university degree......;)
Forum: Tech Log
6th Feb 2013, 08:40
Replies: 1,100
Views: 168,875
Posted By hetfield

@vince Welcome:) I really appreciate...

@vince

Welcome:)

I really appreciate your support.

About overcharging a single cell (1/48 cells), I'm with saptzae, it's voltage limited.

About a bad single cell (short) I'm fully with...
6th Feb 2013, 07:23
Replies: 2,186
Views: 892,200
Posted By hetfield

Yes, lead acid can do it, Li-Ion not. In the...

Yes, lead acid can do it, Li-Ion not.

In the 787 batteries each cell-array (8) has 6 cells in parallel.
So, one cell has litlle over 10Ah.
Forum: Tech Log
5th Feb 2013, 20:00
Replies: 1,100
Views: 168,875
Posted By hetfield

Boeing 787 batteries: What's causing their...

Boeing 787 batteries: What's causing their 'thermal runaways?' - CSMonitor.com...
5th Feb 2013, 17:30
Replies: 82
Views: 43,066
Posted By hetfield

@Lurking SLF Do you mind to publish the...

@Lurking SLF

Do you mind to publish the dates of mentioned accidents?
Forum: Tech Log
5th Feb 2013, 17:27
Replies: 1,100
Views: 168,875
Posted By hetfield

Accident: ANA B788 near Takamatsu on Jan 16th...

Accident: ANA B788 near Takamatsu on Jan 16th 2013, battery problem and burning smell on board (http://avherald.com/h?article=45c377c5&opt=0)
...
Forum: Tech Log
5th Feb 2013, 12:28
Replies: 1,100
Views: 168,875
Posted By hetfield

Well, to my knowledge Li-Ion batteries aren't...

Well, to my knowledge Li-Ion batteries aren't that old...

Yes, but how can a charger/BMS look after the sub-cells?

They have their own social life. The rich feed the poor until dead.
Forum: Tech Log
5th Feb 2013, 11:01
Replies: 1,100
Views: 168,875
Posted By hetfield

I'm still concerned with the 6 sub-cells of each...

I'm still concerned with the 6 sub-cells of each of the eight cells.

They are never equal/matched perfectly. Current oscillations may occur, but even a totally unmonitored thermal runaway...
...
5th Feb 2013, 09:13
Replies: 82
Views: 43,066
Posted By hetfield

Interesting, in my outfit (major EU carrier) we...

Interesting, in my outfit (major EU carrier) we don't have it.

BTW, who was PF?
Forum: Tech Log
4th Feb 2013, 20:01
Replies: 1,100
Views: 168,875
Posted By hetfield

Which cells? 1/8 or 1/48?

Which cells? 1/8 or 1/48?
Forum: Tech Log
4th Feb 2013, 16:58
Replies: 71
Views: 12,107
Posted By hetfield

What is a "Flight Director"? For me, the PF...

What is a "Flight Director"?

For me, the PF is.

If he/she can't cope with the desired flight path, it's me....
at the very end of the chain, the commander.
4th Feb 2013, 11:25
Replies: 2,186
Views: 892,200
Posted By hetfield

@fizz57 It's not that simple, just NOT the...

@fizz57

It's not that simple, just NOT the battery. And this kind of battery isn't also simple at all.

To my knowledge, there are 4 companies involved for 787 batteries :

- GS YUASA (J),...
Forum: Tech Log
3rd Feb 2013, 21:51
Replies: 1,100
Views: 168,875
Posted By hetfield

@mm43 Thx, I know.... True, but...

@mm43

Thx, I know....



True, but irrelevant, negligible?

Don't think so.
Forum: Tech Log
3rd Feb 2013, 21:36
Replies: 1,100
Views: 168,875
Posted By hetfield

No! Eight packs a 65Ah, each consistent of 6...

No!

Eight packs a 65Ah, each consistent of 6 parallel connected cells.

To make clear, one single cell can't hold 65 Ah!
Forum: Tech Log
3rd Feb 2013, 20:48
Replies: 1,100
Views: 168,875
Posted By hetfield

@SoS So, no balancing of each of the 48...

@SoS

So, no balancing of each of the 48 cells, right?
Forum: Tech Log
3rd Feb 2013, 20:21
Replies: 1,100
Views: 168,875
Posted By hetfield

To put it simple... There are 48 cells in a...

To put it simple...

There are 48 cells in a 787 battery, right?

Eight "master cells" are balanced/monitored, right?

The sub cells are NOT BALANCED / NOT MONITORED, right?
3rd Feb 2013, 20:05
Replies: 82
Views: 43,066
Posted By hetfield

@Welle That's Italy. Do you know...

@Welle

That's Italy.

Do you know Francesco Schettino, Captain of stranded Concordia, is challenging his companie's decision to fire him?

Do you know Berlusconi, a multi sentenced criminal,...
3rd Feb 2013, 19:51
Replies: 82
Views: 43,066
Posted By hetfield

@HT I'm afraid, you still didn't get it! ...

@HT

I'm afraid, you still didn't get it!

With increasingly number of flights, chances raise for an accident/incident.

All major carriers like AF/LH/BA, you name it, are facing it!

It's a...
3rd Feb 2013, 19:34
Replies: 82
Views: 43,066
Posted By hetfield

@HT With your logic, any 3rd world bush...

@HT

With your logic, any 3rd world bush hopper is comparable to AF.

Gimmie a break!

Look how many pax/takeoffs per day are done with AF!

BTW
Forum: Tech Log
3rd Feb 2013, 19:30
Replies: 1,100
Views: 168,875
Posted By hetfield

Thx mm43 That's very interesting. Looks...

Thx mm43

That's very interesting.

Looks like 6 sub-cells are put in parallel to a "master" cell of (1/8) 65 Ah.

Who/what is doing the internal balancing?
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