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Search: Posts Made By: Speed of Sound
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Forum: Tech Log
18th Mar 2013, 23:56
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

http://www.boeing.com/787-media-resource/images/gr...

http://www.boeing.com/787-media-resource/images/graphics/Infographic-787Battery-English.jpg

If the schematic of the BMU wiring harness is accurate, then apart from beefing up the design, there is...
Forum: Tech Log
21st Feb 2013, 14:30
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

Once a cell shorts, the input to the BMU for that...

Once a cell shorts, the input to the BMU for that particular cell will show a short circuit. How the BMU responds to that will depend on what it thinks is the cause of the short circuit.
Forum: Tech Log
20th Feb 2013, 10:28
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

Or in the case of the factory fitted Bosch...

Or in the case of the factory fitted Bosch battery in my Mercedes, now in its ninth year of service, 0.04 cents per hour.

And with 110Ah capacity and 1100amp cold cranking, it would almost...
Forum: Tech Log
18th Feb 2013, 09:29
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

I'm sorry, but does anyone think there is a cat...

I'm sorry, but does anyone think there is a cat in hell's chance of the FAA certifying a stopgap where essentially the same arrangement is simply put in a bigger, more fireproof box?

Fair play to...
Forum: Tech Log
16th Feb 2013, 13:31
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

Lyman

Yes, the 'shadow' picture is from the incident battery.

The thermocouple I pictured is purely a generic device whose mounting tab looks like something that could have been bolted to that cell...
Forum: Tech Log
16th Feb 2013, 11:07
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

It looks to me like the thermocouple was mounted...

It looks to me like the thermocouple was mounted directly onto the inter cell shunt probably using something like this.

http://i1280.photobucket.com/albums/a481/SoS57/atsen_zps446ee5ee.jpg

As I...
Forum: Tech Log
15th Feb 2013, 14:47
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

To be fair, if it was glued on there wouldn't be...

To be fair, if it was glued on there wouldn't be a drilled mounting hole for it. ;)
Forum: Tech Log
15th Feb 2013, 13:06
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

rogerg

I'm sure it has but Ni-Cad is what is used on the 380 so as a late 'fix', it is better to go with something that should be fairly straightforward to certificate.
Forum: Tech Log
15th Feb 2013, 12:34
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

The mysterious thermal sensor?

This is the 'shadow' of the connection underneath the 'white gob' in the centre of the battery.

Looks like the fixing lug of a thermocouple. :-)
...
Forum: Tech Log
12th Feb 2013, 14:21
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

areobat

No? :confused:

http://i1280.photobucket.com/albums/a481/SoS57/Ybat787c_zpsf9af567d.jpg

4-6 layers of steel and an air gap looks like a thermal barrier to me!

I'm not saying that it is...
Forum: Tech Log
9th Feb 2013, 17:12
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

Alison 747

Well spotted although as you say, this will only really monitor the air temperature in the casing rather than individual 'hot' cells.
...
Forum: Tech Log
9th Feb 2013, 10:56
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

http://i1280.photobucket.com/albums/a481/SoS57/Yba...

http://i1280.photobucket.com/albums/a481/SoS57/Ybat787_zpsff032c0d.jpg
Forum: Tech Log
9th Feb 2013, 10:40
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

BMS connections.

I have taken this pic from the NTSB Powerpoint presentation which is the highest resolution image I can find of the monitoring connections to the individual cells.

No obvious temperature sensor...
Forum: Tech Log
8th Feb 2013, 18:53
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

kilomikedelta

Thanks for that.

Either my eyes are going or the resolution isn't good enough to see exactly where each sensor wire is teminated at the battery end. I may be wrong but they all seem to be...
Forum: Tech Log
8th Feb 2013, 17:22
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

syseng

Thanks for that.

Does anyone know where the temperature sensors are situated? The only pics of the undamaged batteries I have seen have the insulator cover over the connections and I can't see...
Forum: Tech Log
8th Feb 2013, 15:06
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

I agree, although after a certain number of...

I agree, although after a certain number of 'returns' I suspect Boeing/Thales/Yuasa would want to take a good look at these batteries rather than have them taken apart for reconditioning and put back...
Forum: Tech Log
8th Feb 2013, 13:31
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

Given that it doesn't cover the most delicate...

Given that it doesn't cover the most delicate part of the system (the PCBs and multi-pin connectors) but does cover the battery terminals I would suggest that this insulation is installed permanently...
Forum: Tech Log
3rd Feb 2013, 22:24
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

Lyman

Not if you want to pack more cells into the smallest volume! ;)

http://news.bbc.co.uk/olmedia/1390000/images/_1390088_watermelons300ap.jpg
Forum: Tech Log
3rd Feb 2013, 20:45
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

hetfield

They are not monitored, no.

If you look at the multi-pin connectors on the edge of the PCBs they look to be carrying 16-18 connections each, therefore no more than 36 'data' lines to the...
Forum: Tech Log
21st Jan 2013, 10:07
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

I assume that they do monitor individual cell...

I assume that they do monitor individual cell voltages though.

From the pics of the damaged battery, we can see that the individual cells are strapped together with steel bars and there is a loom...
Forum: Tech Log
20th Jan 2013, 22:22
Replies: 1,100
Views: 263,520
Posted By Speed of Sound

As do iPods and Apple Mac laptop batteries! ...

As do iPods and Apple Mac laptop batteries!

I took my iPod to an Apple store about 5 years ago to have them check out an intermittent fault. They told me that I hadn't used it for over 18 months...
Showing results 1 to 21 of 21


 
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