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Li-ion battery variable charge current problem

-andrea piolanti
Prodigy 10 points

Hi,

i want to charge a 7.5 v 400 mAh li-ion battery from a small solar panel (6V - 1W).

I would connect the solar panel and the battery with a voltage regulator or with a MPP circuit that fixed the output voltage adjusting the output current of the solar panel catching always the maximum power from it. In this way it's difficult charge the battery using the constant current/constant voltage method because i can't control the charge current and i haven't enough power from the solar panel.

In conclusion the charging of the battery is done with a small and variable charge current. Is that a problem? Can i charge the battery always in slow charge fase and with a variable current? If yes, which are the drawbacks?

Thank you. regards!

Andrea

  • 0
    TI__Guru 56650 points

    Slow charge rate with a variable current would not hurt the battery. But, you have to disable the safety timer because it is hard to know the charging time in your application.

    When safety time is disabled, the charger will keep the fully charged voltage on battery even the battery is fully charged. That may be the drawback.