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BQ24171: Dual Battery Pack Solution

Alexander Mazur
Prodigy 90 points
Part Number: BQ24171

Hello,

I am currently using the BQ24171 to charge a single 3-cell battery pack. I am wondering if there would be any issues with trying to charge an additional battery pack in parallel  (i.e. 3S2P, but two separate battery packs). If this is possible, should the NTC of only one of the battery packs be connected to the TS pin, or is there a way to sense from two separate NTC resistors.

Regards,

Alex Mazur

  • 0
    TI__Guru 57561 points
    Alex,

    It is ok to use the same charger architecture to charge multiple battery packs in parallel as long as the battery voltages of the two packs are the same. Only one NTC of the battery packs can be connected to the TS pin of the charger IC.

    Thanks,

    Ning.
    Please click "This Resolved my issue" button if this post answer your question.
  • 0 in reply to Ning T
    Prodigy 90 points
    Ning,

    Thank you for the response. Could you give me an estimated tolerance on how close the battery pack voltages have to be? Say one pack is 11.1V, and the other is 10.9. Would you expect charging to behave as normal?

    Thanks,

    Alex
  • 0 in reply to Alexander Mazur
    TI__Guru 57561 points
    Alex,

    You have to try and determine. The idea works theoretically, but it is not easy to do in the reality. It is recommended to use one charger for one battery pack.

    Thanks,

    Ning.
    Please click "This Resolved my issue" button if this post answer your question.