Register To Comment
Page 24 of 31 FirstFirst ... 142223242526 ... LastLast
Results 231 to 240 of 302

Thread: Lithium cell tests

  1. #231
    leorcc's Avatar
    Member

    Status
    Offline
    Location
    Hoogvliet, The Netherlands
    Posts
    3,320
    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.

  2. #232
    knightrous's Avatar
    Member

    Status
    Offline
    Name
    Knightrous
    Robots
    Scarlet, Little Red Flipper, Annoying Box Rush, Knightrous Wedge
    Location
    Australia
    Posts
    1,031
    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

  3. #233
    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.

  4. #234
    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!

  5. #235
    knightrous's Avatar
    Member

    Status
    Offline
    Name
    Knightrous
    Robots
    Scarlet, Little Red Flipper, Annoying Box Rush, Knightrous Wedge
    Location
    Australia
    Posts
    1,031

  6. #236
    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.

  7. #237
    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.

  8. #238
    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.

  9. #239
    Double post

    (Message edited by m2xt on April 10, 200

  10. #240
    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.

Register To Comment

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •