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Lithium cell tests
From our Australian colleages:
http://farm3.static.flickr.com/2041/2088496840_e3f0c250f2.jpghttp://farm3.static.flickr.com/2041/...e3f0c250f2.jpg
http://farm3.static.flickr.com/2159/2088497690_a3dc838800.jpghttp://farm3.static.flickr.com/2159/...a3dc838800.jpg
And yes, I know it is April 1st, but its no joke. :)
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Lithium cell tests
I though Id chime in with some of my experiences Ive had with A123s in my featherweight.
I currently run 2 x 6cell packs in my featherweight (1 pack at a time) I dont run balancers in them, as I have found I do not need them. I balance the pack initially by matching the cells with voltages within 0.25v of each other. I then cycle them 3-5 times at 200mah. This is low enough that if one of the cells reaches peak before the others, it wont cook. After that it gets 2-3 charges @ 5amps, if any single cell gets hot compared to the others during this, I pull the pack apart (5min job with the http://www.modelelectronicscorp.com/...uct.php?pid=29
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Lithium cell tests
Interesting, I found the paste starts to boil at about 35A in the MEC packs so considered them as being unsuitable for applications above this current. Shame really as it appeared quite a nice solution to the problem.
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Lithium cell tests
Heres a link to the pack build...
http://www.robowars.org/forum/viewtopic.php?t=944&postdays=0&postorder=asc&start =120http://www.robowars.org/forum/viewto...rder=asc&start =120
Note that he used Arctic Silver 5 thermal paste ...which I queried.
Scroll down the page for the complete discourse.
Seems to have worked for him ...goodness knows why!
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Lithium cell tests
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Lithium cell tests
I think that you may have misunderstood the blurb.
The silver used in the compound is 99.9% pure silver ..the ammount of actual silver present in the paste isnt clear.
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Lithium cell tests
I thought Arctic Silver doesnt conduct electricity very well. But I suppose youve tried it at high current, so apperantly it gets displaced enough to make a good connection.
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Lithium cell tests
I used the silver paste from MEC and it was tested at various loads on a 10 cell packs and it sounded like a kettle boiling at 45A from memory.
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Lithium cell tests
Double post
(Message edited by m2xt on April 10, 2008)
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Lithium cell tests
Seems to have worked for him ...goodness knows why!
Possibly just helping move heat around, people have made battery packs just with the cells held together in compression. One disadvantage of this is that the vents are probably compromised.