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BQ34Z100 IT Cfg configuration

Slim123
Expert 1210 points

Hi Tom,

After trying with the setting as suggested, we do not see SOC jumping but there is another problem occurs where both full charge capacity and remaining capacity will drop from 39600mAh to 7000mAh while discharging and SOC stays at 100%. I tried to set max sim rate to 2 by taking the default value suggested in 'Configuring the bq34100 Data Flash' and it solves the capacity problem. Do you know whats the causes of this problem?

Actually have some doubts regarding the configuration for Impedance Tracking. According to the datasheet if we are selecting Load Mode as constant current, there are a few options available for load select. Do you mind to explain in more detail on how do we judge which option shall we select and also how does max sim rate and min sim rate work? If we are using  User Rate-mA,  for example ,User Rate-mA has been set to -1A, we should discharge the battery at 1A in order for FCC simulation to run properly? 

Thanks.

Best regards,

Shirley

  • 0
    TI__Guru 73830 points

    As a general rule, you would choose one of the Load Select options that uses current in the present discharge cycle when the discharge is not a pulsed load. This will allow the simulation to adapt better when the current may vary from cycle to cycle. You can choose LS 1, 2 or 3  to select the amount of filtering in current used by the simulation. If you usually have pulsed load profiles, then it would be better to choose a LS that uses a fixed current. LS 0, 4, 5 or 6. This will provide a more stable current for the simulation. User Rate will be the most stable current, because it will be fixed for all simulations. You can also experiment with the User Rate to tune the simulation to improve the FCC simulations.

  • 0 in reply to ThomasCosby
    Expert 1210 points

    Hi Tom,

    Thanks for the explanation. Will the FCC simulation working properly if i'm setting User Rate as -4A but when discharging I'm using a constant discharge current of -10A?

    And do you foresee any issue if we are setting max sim rate to 2?

    Best regards,
    Shirley

  • 0 in reply to Slim123
    TI__Guru 73830 points

    Shirley,

     If your discharge is a constant 10A, then it would be better to set the User Rate to -10000. If it is pulsed, then a lower value would be better. The simulation will use the User Rate current for its simulations. If you use -4A for a constant -10A discharge, then the FCC and RM will be optimistic.

    You should set the Max Sim Rate to 0 to disable the limit. This is the default setting in the next FW release. Change the ResRelax Time  to  500 as well.

    Tom

  • 0 in reply to ThomasCosby
    Expert 1210 points

    Hi Tom,

    I see. But we have problem in FCC and RCC after setting Max Sim Rate to 0. The FCC and RCC had dropped from 39630mAh to 7060mAh while discharging. 

    Voltage(V) Charge Current(mA) Discharge Current(mA) Temp (  ͦC) RCC(mAh) FCC(mAh) SOC(%)
    53984 0 8780 +0026.9 39630 39630 100
    53984 0 8780 +0026.9 39630 39630 100
    53984 0 8800 +0026.9 7060 7060 100

    What could be the problem and do you have any idea on how to solve it?

    Best regards,

    Shirley

  • 0 in reply to Slim123
    TI__Guru 73830 points

    Shirley,

    It looks like you are discharging at lower than a 1C rate, so I would not think that setting the Max Sim Rate to 0 would cause a difference. Can you send me the gg file and possibly a log file for the pack?

    Thanks

    Tom