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BQ40Z80EVM-020: Learning INR-21700-P45B Cell Chemistry

Caleb Henderson
Prodigy 40 points
Part Number: BQ40Z80EVM-020
Other Parts Discussed in Thread: GPCCHEM, BQSTUDIO, BQ40Z80

I am currently using the BQ40Z80EVM-020 evaluation module to develop a battery management system for a battery pack. As part of this process, I am attempting to identify a suitable ChemID for the Molicel INR-21700-P45B cell which I could not find in TI chemistry database.

We have been following the recommended learning cycle and data collection procedure, but have been unable to achieve a suitable match. Based on the TI documentation and community guidance, we understand that in such cases the cells may need to be sent to TI for characterization and ChemID generation, and that this process is coordinated through a local Field Applications Engineer (FAE).

Could you please connect us with a local FAE or representative who can assist with next steps for cell characterization, or advise us on the appropriate procedure for submitting cells for ChemID generation?

Thank you

  • 0
    TI__Mastermind 30710 points

    Hello,

    This question has been assigned and will be reviewed by the team when possible.

    Thank you,
    Alan

  • 0
    Prodigy 40 points

    I have a few additional questions.

    I have been trying to complete a RELAX -> DISCHARGE -> RELAX cycle to obtain the SOC vs OCV curve to determine the cell chemistry through GPCPackager and GPCChem tool.

    I have three different battery configurations, and I want to know if one is most suitable or necessary for this stage of cell learning.

    I have a 6S1P, 6S4P, and 1S1P configuration of these cells assembled. 

    Would multiple cells in the discharge increase or decrease the accuracy of the chemistry learning?
    Is one of these configurations most preferable for this process?
    Can we program the chemistry learned from one cell to any battery configuration containing those cells?
    Is it fully necessary to charge to the maximum cell voltage for this chemistry matching? It seems dangerous and I worry it would degrade the cell.

    Thank you.

  • 0 in reply to Caleb Henderson
    TI__Intellectual 2792 points

    Hello Caleb,

    Is this your cell? It might already be in the latest CHEMID database.

    -Miguel

  • 0 in reply to Miguel Castro Gonzalez
    Prodigy 40 points

    Correct, this is my cell. I do not see this cell chemistry available in my bqStudio. I am using 0.04 bq40z80 firmware. Is the only method to obtain this chemistry to submit my relax-discharge-relax cycle to GPCChem? I was having difficulty capturing the tail end of our cells minimum voltage because of no available profile on our hobbymate smart charger. I was failing to get a match with my data. I have tried using an external static load, but the discharge is really slow. If there is another way to obtain this chemistry, could you let me know?