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BQ24753A: Regenerative Lipo Charging/Balancing

Tarik Snyder
Prodigy 80 points
Part Number: BQ24753A
Other Parts Discussed in Thread: BQ24617, BQ25700A, BQ24780S

Hello Texas Instruments Specialists,

I am looking for some guidance regarding your battery management chips in particular chips that can charge/balance a 3 cell 11.1V lipo at an output current of around 8-10A. I found a few chips that are capable of charging at 8-10 Amps and can take a large input voltage of about 5-24V such as the BQ24617, but none that seemed to allow the battery to ever so often drain current to a load. In my application I am currently regeneratively charging an 11.1V 1350mAH lipo at a rate of around 8 amps. The battery will most of the time be sitting and charging from a portion of the 8 amps produced, though at other times the same generator producing the 8 amps of power may want the battery to drain 10-20A to it to start. This is essentially a two way system where at very short periods the lipo battery will be providing power and at longer periods it will be charging/balancing. I am hoping I could get help in finding a chip capable of balancing and charging as well as allowing the current to flow in the opposite direction to the input. I would also greatly appreciate advice towards other options if possible such as storing the 8 amps of power instead of forcing it to the battery. 

Thank you,

Tarik 

  • 0
    TI__Guru 56650 points
    "though at other times the same generator producing the 8 amps of power may want the battery to drain 10-20A to it to start"
    Just want to confirm:
    1. when the same generator producing the 8 amps, is this generator the load of the battery? In this case, we can call it OTG (on the go) mode which boost the battery energy back to input port. We have bq25700A. But, the OTG output is limited to 6A.

    2. The same generator and battery supports a 10~20A load together. In this case, we call it Turbo mode which boost the battery voltage up and support system load with the same input source (generator) together. Please check bq24780S datasheet and its architecture. It can support this case.
  • 0 in reply to Wang5577
    Prodigy 80 points
    Thanks for the quick response! Yes the generator acts as the load when it needs to start up and draws current for a short period which gets to almost 20A. I will look at those chips you suggested as well. Would these chips be able to balance the lipo while it is charging?

    Thanks so much,

    Tarik
  • 0 in reply to Tarik Snyder
    TI__Guru 56650 points
    TI charger IC and TI battery gauging cell balancing IC are different IC. Charger parts don't have cell balancing function. But, most gauge ICs have the cell balancing circuit.
  • 0 in reply to Wang5577
    Prodigy 80 points

    I see so it would be highly recommended to get a lipo cell balancing gauge IC and a TI lipo charger IC because the battery management charger chip such as the bq24780S would not be able to balance. To give you a better idea of what I am trying to set up here is a diagram of how things hopefully would look. I tried uploading the image below. And if you have any recommendations on gauge balancing chips that would be very helpful.

    Thanks,

    Tarik

    IMG_5606.pdf

     

  • 0 in reply to Tarik Snyder
    TI__Guru 56650 points

    Thank you for the drawing. I will invite a gauge team support to join this discussion. 

  • 0 in reply to Wang5577
    Prodigy 80 points

    Great, thanks for all the help so far.

    Best,

    Tarik Snyder

  • 0 in reply to Tarik Snyder
    TI__Genius 10830 points

    Hi Tarik,

    If you're looking for a gauge + AFE in a single package, you can look at bq4050 or bq40z50-R1.

    BTW you can identify gauges for your projects from the gauge webpage  then select "products"

    Regards,

    David Hien