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Need solution for safely charging a 11.1V, 6000mAh lithium ion battery pack(with inbuilt PCM and 3s cells prepacked)

Rohit V
Prodigy 60 points
Other Parts Discussed in Thread: BQ24765

Hi,

I am looking for a decent safe solution to charge my li-ion battery pack(11.1 V, 6000 mAh) which has a inbuilt pcm circuit and the cells are already connected in series. So, I basically do not have access to individual cells. Hence, I need help as in what will be the safest possible solution to charge these prepacked li-ion battery packs, keeping in my the battery lifetime. It would also be helpful if it can include communication interface(I2C, SPI, etc).

Thanks & regards,

Rohit

  • 0
    Prodigy 5 points
    Hello Rohit, thank you for posting to our forum.
    It appears you have 3 series cells, at 3.6V plateau, equals 11.1V.
    Full LiIon will have ~4.2V per cell, 12.6V full.


    What input voltage do you have available?
    TI has BUCK chargers, so for your design an input voltage of ~15V will be needed.
    What charge rate do you desire?
    Usually LiIon allow for up to 1C charge rate, 6Amps for a 6000mAhr series stack.

    This link will send you to the MultiCell chargers with communications bus on TI.COM
    www.ti.com/.../battery-charger-ic-products.page

    An excellent first choice would be the BQ24765.
    www.ti.com/.../bq24765
    SMBus Controlled Battery Charger with Integrated FETs

    Please review this product page and let me know your comments.
    Thank you.