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BQ40Z50-R2: High capacity battery pack using bq40z50-r2

BONGGEUN SHIM
Prodigy 40 points
Part Number: BQ40Z50-R2

Tool/software:

I want to develop a battery pack with a capacity of 100Ah using 5Ah cells in a 3S20P configuration.

If I use bq40z50-r2, the maximum capacity is not suitable for 65Ah.

Can I adjust the scale factor to use it?

For example, reduce it to 1/10 so that 100Ah is expressed as 10Ah.

If possible, is it not necessary to adjust the current scale?

Thank you!

  • 0
    TI__Mastermind 25725 points

    Hello Bonggeun,

    Although there is not a scaling parameter within the BQ40z50r2 link to current, the user can manipulate current scaling through the "calibration" tab. In terms of your example you can apply 10amps and configure it to be 1amp within the calibration tab meaning that 10amps passed through the device would be seen as 1 amp. You would need to update every parameter that is associated with current and you will see a drop in resolution due as well.

    Thank you,
    Alan

  • 0 in reply to Alan Frias
    Prodigy 40 points

    Hello Alan Frias

    As mentioned above, for applications where the capacity exceeds 65Ah, is it a common practice to design by scaling both the capacity and current calibration by a factor of 1/2 (e.g., 100Ah → 50Ah / 1A → 0.5A)?


    Is this method officially recommended by TI?

    Thank you

  • 0 in reply to BONGGEUN SHIM
    TI__Mastermind 25725 points

    Hello Bonggeun,

    To give some frame of reference with no scaling the max design capacity is 32,767mAh however to achieve the 65Ah we typically recommend the user to do scaling with calibration. In your application of 100Ah although it is possible the biggest you will face is losing resolution within your system meaning that you will suffer SOC % accuracy along with having a high amount of cells in parallel.

    Thank you,
    Alan