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BQ40z60 Evaluation Board Charging not possible

Nils Ratzlaff
Prodigy 210 points
Other Parts Discussed in Thread: BQ40Z60

Hello,


I have the BQ40z60 Evaluation Board to charge two Batteries by Typ Panasonic NCR18650B (Capacity 3350mAh).

It's only possible to discharge the Batteries but no charging!!

The Relatative State of Charge is always 100%. To perform a Learning cycle isn't possible.

I hope you can help me which register must be set to charge the Batteries.

Attached you will find the srec file in abq40z60.7z 7z file.

  • 0
    TI__Guru 73830 points

    You did not have the CHG and DSG FETs enabled (FET_EN). You also needed to update these parameters to support a 2S configuration.

    Minimum Voltage Output

    Voltage Resolution

    Term Voltage

    bq40z60 modifiedTI.srec

  • 0 in reply to ThomasCosby
    Prodigy 210 points
    Thank you very much for your fast response and the modified file!!
    Now it is working :)
  • 0 in reply to Nils Ratzlaff
    Prodigy 210 points

    Hello!

    I have a second problem. I reduce the threshold for the Cell Over Voltage under protections to 4250mV and now I can't charge my two batteries fully. Charging stops at the End of the Constant Current mode when the Pack Voltage is reached at 8500mV and the flag COV is set.

    I can't explain this behavior, because I set all charging Voltages under Advanced Charge Algorithm to 4150mV.

    Attached you will find my srec file.

    EDIT: I found the mistake. The Minimum Voltage Output was not set correctly. In the manual of the Eval Board I found that the Minimum Voltage Output must be set to 4350mV. Please tell me, what background this value has and how I can calcluate it exactly!

    7357.bq40z60.7z