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battery charging temperature compensation

Discussion in 'Electronic Basics' started by kell, Oct 31, 2005.

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  1. kell

    kell Guest

    Found a reference for lead acid; about -5.5 mV/*C per cell.
    Seeking the same info for li-ion.

    With lead acid you would get a 1% compensation differential with a 4.4
    degrees centigrade change. If li-ion batteries were to require
    compensation of the charging voltage versus temperature on the same
    order of magnitude, then that would take you outside the 1% voltage
    regulation specified for li-ion batteries even within a fairly narrow
    temperature window. But I can't find any information about this.
  2. PeteS

    PeteS Guest

    Li+ batteries, when charged using constant current/constant voltage (as
    specified by the manufacturer) require no temperature compensation in
    the charger when being charged within their acceptable temperatures.

    For Li+, charging should only start when 0C <= T(batt) <= 40C. Charging
    can continue for 0C <= T(batt) <= 45C. Li+ should not be charged
    outside these temperature limits (for safety reasons).


  3. kell

    kell Guest

    show me a link where I can look at that information.
  4. kell

    kell Guest

    It will take more than a blanket statement to convince me that
    temperature has no effect on the chemistry.
  5. PeteS

    PeteS Guest

    Grumpy today are we?

    Temperature *does* have an effect on the chemistry. read carefully what
    I actually said:

    << require no temperature compensation in the charger when being
    charged within their acceptable temperatures >>

    There's that note about acceptable temperature ranges. Indeed, it is
    because of chemistry changes that one should not charge the device
    outside the temperature range I stated. Unlike other chemistries where
    we can compensate a little for a wider temperature range, Li+ and
    LiPoly are not susceptible to this technique.

    As to manufacturer's documentation, they are a google search away.

    Try varta batteries (They are one of the many suppliers I use).

    You can also look for scholarly papers on the actual chemical effects
    within Li+ quite easily.


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