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BQ35100: Accuracy comparison State-of-health (SOH) algorithm vs Coulomb accumulation (ACC) algorithm

PYTsai
Genius 11495 points
Part Number: BQ35100

Tool/software:

Hi 

My customer are using coin battery, 3V/1000mAh. The requirement for the gauge is < 3% error when bettery close to EOS.

in this document  Alternative Gauging Techniques for Flow Meters and the Benefits of the bq35100

this figure show less than 1% error when close to EOS, is this figure uisng State-of-health (SOH) algorithm or Coulomb accumulation (ACC) algorithm

Also this figure show less than 1% error when close to 100% DOD, is it using State-of-health (SOH) algorithm ? 

Comparing to  State-of-health (SOH) algorithm, will Coulomb accumulation (ACC) algorithm be more accurate when battery close to 100% DoD ?

  • 0
    TI__Mastermind 25225 points

    Hello Pytsai,

    This question has been assigned and will be reviewed when possible.

    Thank you,
    Alan

  • +1
    TI__Guru 61006 points

    The first picture shows the DOD error as a function of OCV measurement. This is not the result from an algorithm but the accuracy of the chemistry data that the gauge uses. The gauge can calculate DOD by measuring OCV. And this graph shows the error from this process.

    The second picture illustrates cell resistance as a function of DOD and the error of this resistance in %. This is the basis for the SOH algorithm.