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Li-Ion Battery Charger

Bill Keith
Intellectual 300 points

My application is to use a Li-Ion battery as a backup to the main power. This means that 99% of its life will be at full charge. When the main power is removed I need the battery to take over. I need a charger for the battery that can accommodate this application. It is for a single cell Li-Ion. I need it to protect against Over Voltage, Under Voltage, and battery shorted as the battery doesn't have the protection ckt built in. Temp range is 0-60 but I prefer -40 to 85C.

Thanks

  • 0
    TI__Prodigy 725 points

    Hello,

    Most of the battery chargers that have the charge termination function (almost all of them) are OK to use in this scenario.  Basically when the battery is full, the charger will stop and allow the cell to relax.  If the cell self-discharges by some threshold (typically 100 to 150 mV) below the full level, the charger will re-start and top-off the cell, but again terminate when the charge current has tapered down to a low level.  So the cells will not be overcharged in any case.

    The charger choice comes down to your desired voltage, number of series cells, charging current, and input voltage source.  If you enter these into the parametric search tools they should help you narrow down the choice.  The IC temperature range is generally much wider than the normally allowed Li-Ion battery operating range (0 to 60).