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BQ34Z100-G1: Max DOD error exceeds 8%, can it be used with the bq34z100-G1?

Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQ34110, GPCCEDV

TI experts,

  Cylindrical LiFeCoPO₄ Cell, chemical ID calculated by GPC, the max DOD error exceeds 8%,

  can it be used with the bq34z100-G1?

  Need to send battery cells to TI in the United States to customize the chemical ID?

  

  

 

 

  

  • Hello,

    Anything over around 5% DOD error should not be used for the application, this would must likely need a chem ID specific for this cell to use Impedance Track.

    Sincerely,

    Wyatt Keller

  • Hello,

    One addition I can make is to review the BQ34110 CEDV gauge, you do not need a chem ID for the CEDV algorithm and it tends to be a little more robust for LFP battery chemistries.

    You can use the GPCCEDV tool to find your CEDV parameters by submitting logs to us.

    Sincerely,

    Wyatt Keller

  • Hi Keller,

    My other projects with customers are using the bq34z100-G1, and we have been developing with this chip for half a year.
    Of course, the cells used in other projects are NMC materials, and these projects have progressed relatively smoothly using bq34z100-g1.
    Now it is a new project, and the cell is LFP material.
    I think, due to the consideration of the bq34z100-g1 chip in the warehouse, and the firmware update and complexity issues on the customer's system side. Still want to continue to use bq34z100-g1.
    Of course, I would also like to try the bq34110 for comparison.

    Another problem is that it is difficult to apply for chip samples of bq34110 now, we do not have stock. The TI website is also out of stock.

  • Hello,

    I understand the situation. We can proceed with implementing the BQ34Z100-G1 - I would just be aware that it can be more challenging for LFP chemistries using Impedance track since the OCV has a large flat region.

    I will work with your FAE to get the process started.

    Sincerely,

    Wyatt Keller 

  • Hi Keller,

          Thank you very much for your help.