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Original question:

BQ78350-R1: GPC Reports for CEDV

BQ78350-R2-DEVICE-FW: BQ78350-R2 GPC Report Error with "unidentified reason"

Battrick
Prodigy 180 points

Part Number: BQ78350-R2-DEVICE-FW

Hello E2E Forum,

I've been having issues with the GPC tool.

I've had successful results in the past for another batter packs, but this time I always get an error report with an unknown reason.

I don't know what could be wrong with my GPC package, since I already tried to change numerous things and also compared it to older GPC packages that already did work.

Attached you can see my last version of the GPC package. I hope that someone could help me.

Thanks in advancePackage.rar

  • 0
    TI__Guru* 81034 points

    Hi,

    It looks like this file fails because it has discontinuity in the room temperature low rate log file.

    14151.48 24863 29.2 -10010
    14156.48 24859 29.2 -10010
    14161.49 24858 29.2 -10010
    14166.72 24856 29.2 -10010
    14171.49 24855 29.3 -10010
    14176.49 24852 29.3 -10010
    65535 0 0 36200
    14186.72 24845 29.3 -10010
    14191.49 24844 29.3 -10010
    14196.49 24841 29.3 -10010
    14201.49 24839 29.3 -10010
    14206.72 24836 29.3 -10010

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 180 points

    Hi Matt,

    thank you for your fast response.

    You're right, there was a discontinuity in my log file. I simply interpolated the missing values and tried to send it over to the GPC CEDV tool again.

    Now i get another error message:

    I think that it is a good idea to plot the csv data, because if there are any issues you are able to detect them easily.

    So I did a I think to know what the problem is, but also wanted to ask you what you think.

    Please take a look at my measurements. IMO hightemp_lowrate.jpg and roomtemp_lowrate.jpg are causing this issue?!

    I was not able to figure out why this measuremetn failed but I will try to start over again.

    Could you please tell me if you think that this is the cause for the error message from the GCP CEDV tool?!

    Thanks!

  • 0 in reply to Battrick
    TI__Guru* 81034 points

    I do not see anything wrong in the plots at first glance. For some reason, the error message image did not come through in your post. Can you resend the error message?

    Thanks,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 180 points

    Of course,

    hopefully this time it works...

  • 0 in reply to Battrick
    TI__Guru* 81034 points

    One thing you can try is to use different Max SOC and Min SOC settings to see if it resolves the error. If this does not work, can you send me the updated corrected package you are sending to the tool?

    Thanks,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 180 points

    I tried to vary both parameters MAX SoC and MIN SoC in the config file, but I still always get back the same Accuracy Error message.

    Below my last version of hte GPC package:

    7737.GPCPackaged.zip

    Thank you!

  • 0 in reply to Battrick
    TI__Guru* 81034 points

    Thanks for sending the package. I've asked our algorithm expert to look at this to see what the problem might be.

  • 0 in reply to Matt Sunna
    TI__Guru* 81034 points

    See the link to the attached report below using the data you collected. Our algorithm expert was able to get normal accuracy with your package. He experimented with different min and max settings and sees better results with a max of 8 and a min of 6.

    Fundamentally high error at high temperature high rate case happens because this data includes extreme temperature rise all the way to 70C. With such large temperature swing equation is reaching its limits. To reduce the error the high temp high rate case would have to be collected at lower rate.

    /cfs-file/__key/communityserver-discussions-components-files/196/3465.GPC_5F00_report.zip

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 180 points

    Hello Matt,

    thank you for your quick response and your help.

    I changed the values in the BMS and now I will try to run some accuracy tests.

    Regarding the error that occured.

    [1] Does that mean that I should not reach temperatures up to 70°C during data collection?

    [2] If so, what would you recommend as max temperature?

    [3] Also if that is the case, I need to collect my data at lower current rates. Do I need to lower the current rate to the same value for all high rate measurents or only for the high current - high temp cycle because this one was critical?

    Thanks for your help

  • 0 in reply to Battrick
    TI__Guru* 81034 points

    You only need to lower the current rate for the high current - high temp cycle. The max spec for the GPCCEDV tool is 70°C, so it would be good to try to stay well under that limit. 

    Best regards,

    Matt