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BQ35100: Sudden SOH Drop to 0%

Antonio Fadhel
Genius 9410 points
Part Number: BQ35100
Other Parts Discussed in Thread: BQSTUDIO

Hi Team,

My customer is evaluating the BQ35100EVM with 4S Duracell CR17345 batteries (ChemID 0703), but are having issues where SOH suddenly drops from close to 100% to 0%. I suspected a wrong terminate voltage, but it is well below their battery voltage. They are running in SOH mode following the slua904 guide. Any ideas what could be causing this? Please see bqStudio screenshots below:

Thanks,

Antonio

  • 0
    TI__Genius 10370 points

    Antonio,

    In addition to doing a voltage comparison check the gauge also takes into account temperature and also the load.

    From the images [max load] = 1000mA, Voltage =11400mV. At 11400mV that roughly corresponds to 40% according to ID 703. At 40% the resistance for ID 703 is around 3k+. Using this resistance and [maxload] i get a potential IR drop of 3V (1A*3Ohm). Therefor 11.4V-3V  = 8.4V which is very close to the terminate voltage. The numbers are not exact, but can give the general idea on why we are crashing to 0. 

    please let me know if this doesn't clarify. 

    Thanks,

    Eric Vos