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Jumpstarting dead lithium batteries?

Discussion in 'Power Electronics' started by Resqueline, Jan 9, 2012.

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  1. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    I just came across today a person that had received a new but stored-until-dead cellphone battery.
    It would not take a charge the normal way, so the supplier told him to jumpstart it with 5-6Volts, which he did - with success.
    This made me raise an eyebrow, and now I ask myself, and you, what is going on with the batteries in these circumstances?

    We all know that the lithium technology is said to be very sensitive to both under- and over-voltage, with possibly disastrous outcomes.
    They therefore usually contain circuitry to prevent over-discharge etc. Does the jump-start damage/reset this circuit or is just the chemistry affected?

    Standard charging procedure is to apply a very limited current - if the voltage is under a certain limit - and only apply full current when the voltage rises to a "safe" level.
    Then the upper voltage is to be limited to 4.2V - above which the battery will supposedly be damaged (at least in the long run).

    Does any of you have any specific experience with this, or an in-depth knowledge of the chemistry that can explain it?
     
  2. GonzoEngineer

    GonzoEngineer

    321
    2
    Dec 2, 2011
    I designed a Lithium, 4 cell charger about six years ago using the LT1512 (?)

    I seem to remember reading one of their app notes on this same subject.

    Check Linear.com......maybe you can find it. They have a wealth of information on charging circuits for various batteries.
     
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