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BQ4050: CEDV coefficients configuration

AV
Prodigy 240 points
Part Number: BQ4050
Other Parts Discussed in Thread: GPCCEDV

Hi,

Will the same CEDV coefficients obtained from TI GPC Tool for 4S8P pack with 3.2V per cell and 25.6 Ah with bq4050 work for a 4S6P pack with 3.2V per cell and 19.2 Ah.?

Or is it required to run the Temperature Chamber tests again and upload to GPC tool for 4S6P pack ?

And are the CEDV coffecients only dependent on no. of cells in series or also on the no. of cells in parallel?

Also in the GPC report sent from TI it is mentioned -(Accuracy Error: Deviation is so high that it is most likely due to anomaly in the data) but also provided with CEDV co-efficients ,so how likely and accurate are the CEDV coefficients provided from GPC tool considering the deviation.

  • 0
    TI__Guru* 76230 points
    you determine how accurate the deviation is by running an accuracy test to see how accurate the gauge is,

    for the new pack, ps rerun and resubmit to gpccedv.

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 240 points

    Hi,

    We have started with the accuracy tests after uploading the values sent by TI into the gauge. we completed 2 charge-discharge cycles,during the 3rd discharge cycle , at the start of discharge there was a massive drop in the RAh from 24947 Ah to 1792 Ah (SOC from 98 % to 7%). Is there any specific reason as to which this condition could have occurred. The pack is a 4S8P pack.I have attached the log files and gg gile for reference.

    Thanks,

    AVdsg info.zip

  • 0 in reply to AV
    TI__Mastermind 24870 points
    Hi,

    Did you reprogram the CEDV coefficients and send a RESET to the gauge for the parameters to take effect?

    CEDV algorithm will force a jump to 7% when the EDV2 voltage is reached. 3% if the EDV1 voltage is reached. 0% if the EDV0 voltage is reached. These are computed based on your coefficients.

    The two cycles in which you ran shows a rather large error.

    Thanks