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BQ40Z50-R1: Some weild appearance about BQ40Z50R1, what is your suggestion?

andrew liu
Prodigy 110 points
Part Number: BQ40Z50-R1


Hello:

      We 100wh bettery use BQ40Z50R1, various problems here and there, and months ago I had submitted a case on E2E, and got kind response from waytte,

      Now two failure analysis report as attached file, please review;

     what is your suggestion about it?

Charge_Nfull_analysis report.xlsxPurple light issue analyzing report_20220422.xlsx

  • 0
    TI__Guru** 105990 points

    Hello Andrew,

    As we discussed on the previous debug efforts, the Chg Current Threshold is also used by the gauge to determine if the CHG FET should be opened or closed. Since the charger used is not a charger, it is just a DC supply, it makes it very difficult for the gauge to properly implement it's protections. 

    Since your system always has a load and when the DC power is always present when plugged in, you will see this pulsing as the gauge is trying to figure open/close the CHG FET based on the protection settings, but also allow discharge to get out of the COV condition. There is no way to avoid this from the gauge side since this is a system level issue and requires a more advanced power management charger/IC.

    I'm not sure of your settings since I did not see a .gg file, but you will need to adjust the cell balancing times in the gauge to account for external balancing, otherwise the balancing could over-correct/under-correct and cause higher cell voltage deviations.

    Sincerely,

    Wyatt Keller