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li-ion battery charging

Discussion in 'Electronic Repair' started by [email protected], Feb 10, 2006.

  1. Guest

    i have recently purchased some li-ion batteries and connected them in
    parallel and series to get a rating of approx22V and 4400mAH . i am not
    understanding how to charge them ,,i have a dc adapter of rating 24v
    and 1.25A ,can charging from this adapter be a solution to this
    problem if yes then for how much time should i charge the battery pack
    ..?

    please reply cos this is really urgent .
    any kind of information is welcomed.
    thanx!
     
  2. Dave D

    Dave D Guest

    Absolutely not, it *will* almost certainly destroy the cells, and they may
    well explode. Do a Google search- there's plenty of info on how to acheive
    what you want. IIRC, basically Li-Ion cells must be charged with both
    current and voltage control. It's not too technical in theory, but you can't
    just bung a constant current through them and expect them to last.

    Dave
     
  3. budgie

    budgie Guest

    Assuming this is not a troll, charging of Li-Ion cells is a far more demanding
    exercise than nickel-based or even lead-based cells. These cells present
    substantial risks if not charged/discharged correctly.

    The proper regime involves:

    .. current-limited constant voltage charging.
    .. monitoring of cell voltage differences in series strings.
    .. provision for monitoring cell temperature to ensure it is within the "safe"
    region.

    In the recent past (it's probably been superseded several times over) I have
    employed the Maxim MAX1737 controller chip in a commercial charger. It's worth
    reading the data sheet on this device for much good information on the care and
    feeding of these cells.

    http://pdfserv.maxim-ic.com/en/ds/MAX1737.pdf

    There are bound to be many more data sheets with similar valuable information.
     
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