• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 374 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ78350-R1: CEDV Data Collection for Gauging Parameter Calculator (GPC)

Marco Antonio Vega
Intellectual 365 points
Part Number: BQ78350-R1
Other Parts Discussed in Thread: TIDA-00792, GPCCEDV

Hi,

We have designed a designed a battery pack + BMS based on reference TI Design TIDA-00792 but modified+dimensioned according to our application.

Now we want to obtain matching Compensated End of Discharge Voltage (CEDV) coefficients for the specific battery profile. In our application exist an extended mode that we can consider "average high rate", in which the battery could be able to be discharged around of 2 minutes after applyng this constant average high rate.

I have read that the fastest time interval for logging *.csv data files should be higher than 5s. It means that the log file of high rate test will have around of 24 rows. Is there any problem of using such average high rate .csv file? Are there a minimum of samples/rows in *.csv files to obtain CEDV?

Moreover, we're going to perform this average high rate test with a constant resistor. It means that the current will decrease meanwhile the battery voltage is going down through the test. Is there any problem doing this high rate test with a resistor?


Thanks,

Marco.

  • 0
    TI__Guru* 81034 points

    Hi Marco,

    I don't know of a requirement to sample at 5s or slower or for a minimum number of samples/rows. I think it is best to sample at a faster rate especially since your discharge occurs within 2 minutes. The GPCCEDV tool should still work with a decreasing current, but since your current will be lower during the EDV2 voltage threshold crossing it is not ideal. It is best to either do a constant current discharge or use a discharge that is representative for your application.

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Intellectual 365 points

    Hi Matt,

    Thank you for your response.

    One additional question: The 3 pairs of log files test required for Gauge Parameter Calculator Packager; should be done using the battery pack (composed for 14 series cells) or using a single cell? 

    Regards,

    Marco

  • 0 in reply to Marco Antonio Vega
    TI__Guru* 81034 points

    Hi Marco,

    You can collect the log files on the pack or on a single cell. Just make sure to enter the number of series cells you used in the config.txt file, so that the online GPCCEDV tool will account for this.

    Best regards,

    Matt