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BQ20Z65-R1_BQEVSW-SW: chemical selection

AWT AWT
Prodigy 20 points
Part Number: BQ20Z65-R1
Other Parts Discussed in Thread: GPCCHEM

hello , can you explain me why The chemical selection doesn't match from our cells to your power calculator GPC ?

here is the file we use for it, it is a M35A cell from Molicell

regards

M35A.zip

  • 0
    TI__Mastermind 35391 points

    Hey Gus73220,

    I looked over the files you sent and I do see one issue with how the test was performed. The charging and discharging was done at a higher than recommended rate. You charged at 5A and discharged at 1A. It is recommended to charge at a rate of C/2 and discharge at a rate of C/10. Therefore, I would recommend you to redo the test, but this time, charge at 1750 mA and discharge at 350 mA (since the capacity of your battery is 3500 mA).

    Sincerely,
    Nick Richards

  • 0 in reply to Adrian
    Prodigy 20 points

    the capacity of my battery is 10.5Ah, so that why we have so high power charging and discharging.

  • 0 in reply to AWT AWT
    TI__Mastermind 35391 points

    Hey Gus73220,

    Sorry, I should have clarified with you, are you running multiple cells in parallel?

    The GPCCHEM is going to try to match it best with all the cells that we have characterized. Therefore, there are many aspects that can affect the results of the test, including temperature. If the temperature that your test was run at is more or less than room temperature, then this can be the cause of your battery being matched to a different cell. I did notice that the temperature of your battery did reach 36 degrees Celsius, which I'm sure is a result of having many in series and in parallel. The tests were completed using the recommended method. Therefore, I would trust the CHEMID that was matched when you received the report.


    Sincerely,
    Nick Richards

  • 0 in reply to Adrian
    Prodigy 20 points

    Hello,

    Yes we have 4S3P battery pack for the test, shiould we do it with just 1 cell ?

  • 0 in reply to AWT AWT
    TI__Mastermind 35391 points

    Hey Gus73220,

    If every cell in your pack is of the same exact battery, then it will be perfectly fine to run the GPCCHEM test with just one cell.

    Sincerely,
    Nick Richards