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Use bq78PL114 with series blocks of 12S cells?

John M
Expert 2135 points
Other Parts Discussed in Thread: BQ76PL102, BQ78PL114

I have an application that uses six series-connected blocks of 12S Li-Ion cells and twenty-four series connected blocks of 12S Li-Ion cells.  I've reviewed all the literature (I think) for the bq78PL114 and bq76PL102 and could not find an answer to this question...

Is there anything preventing me from using one bq78PL114 and four bq76PL102 to manage a 12S block of Li-Ion cells and then place these 12S blocks in series?  I'd add digital isolators to the SMBus or SPI lines for each block.

Thanks

  • 0
    TI__Guru 54715 points

    The bq78PL114 has no features for stacking beyond its supported cell count, but if your system design provides these, the concept should work when the 12 series cell version releases. One aspect that may not be apparent is that each 12 series cell block could balance its cells, but there is no provision to balance between blocks of cells.

    WM

  • 0 in reply to WM5295
    Expert 2135 points

    Ahhh, of course....makes perfect sense, thanks for mentioning that.  Not sure if that's a problem or not considering that each block will be balanced to the same voltage and watched over by the bq78PL114/bq76PL102 chips.  I would think that any group of 12 cells would pretty well average out in terms of performance, capacity, IR, etc., and that the balancing between 12 cells would be sufficient. I'll need to speak to our Li-Ion guru.

    Thank you for the reply!