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Original question:

BQ25713: Advice on 4S4P Battery to charge

BQ25713: 4S4P monitoring

Elisha Tarroza71
Expert 3700 points
Part Number: BQ25713
Other Parts Discussed in Thread: BQ76PL455A, BQ79606A-Q1

Hello!

Does the same concept apply to battery monitors?
If we're selecting a battery monitor, we still count the number of series cells, hence, for 4s4p, we get a monitor that can monitor at least 4 series cells, and not 16?

Thank you

  • 0
    TI__Expert 3700 points

    Also, I've been reading the description of this EVM, and it says that it can monitor "16 cells connected in series" that are part of a "larger battery pack". It seems contradictory to the concept above. Does this apply to all battery monitors?

    If this is the case, does this mean that I will need 4 battery monitors to check the voltage of the 4 parallel cells of 4S4P?


  • 0 in reply to Elisha Tarroza71
    TI__Expert 3320 points

    Hi Elisha,

        I believe it is better to use bq76PL455A  as part number to find out the right answer for this questions. I am looping in the team supporting the devuce or you can file a new thread using  bq76PL455A as the part number. Thanks.

    Regards

  • 0 in reply to Shishuo Zhao
    TI__Genius 17370 points

    Hi Elisha,

    For the bq76pl455a, this device supports anywhere from 6-16 cells per device but stackable up to many more. So when we talk about supporting 6-16 cells/channels, it is referring to series cells, not parallel, as the monitor is indifferent to adding parallel cells since the voltage stays the same. In other words, you would not need more devices to support the parallel cells, but you would need at least 6 series cells to meet the minimum voltage requirement of the bq76pl455a device.

    In this case if you are looking for 4 series cells, I would recommend the bq79606A-Q1 device here: http://www.ti.com/product/BQ79606A-Q1 which supports 3-6 series cells. Similarly, you would only need one device even with 4P added to the 4 series cells.

    Best Regards,

    Taylor

  • 0 in reply to Taylor Vogt
    TI__Expert 3700 points

    Thanks, Taylor! This is very helpful. 

    One more question though -- if the monitor is indifferent to adding parallel cells since the voltage stays the same, does this mean that the cells in the battery packs are connected in parallel as well?

    Thank you!

  • 0 in reply to Elisha Tarroza71
    TI__Genius 17370 points

    Hi Elisha,

    Yes, thats correct assuming you are using the same initial V and capacity cells in parallel. In scenario 2, you would likely need a separate monitor for each parallel set to keep track of all of the individual cells.

    Regards,

    Taylor