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BQ35100: 2S cell configuration with battery diodes

L-Unit
Prodigy 20 points
Part Number: BQ35100
Other Parts Discussed in Thread: BQSTUDIO, GPCCHEM

Hello, 

I would like use your BQ35100 in my application to get the state-of-charge for my battery-pack. I use LiSOCl2-cells (Minamoto ER17505M) in the configuration 2s3p. I think the coulomb accumulation should do it here. Which algorithm configuration do you recommend in this case? 

The battery pack has internal diodes and a fuse included. The diodes in series to the cells are schottky diodes (3x 1N5819). Parallel to the cells are rectifier diodes (6x 1N4007). Do you think this will also work with your EOS algorithm? 

Is it necessary to program my battery cell type or can I use an existing?

How can I add my Minamoto cell?

Thanks & Best regards

  • 0
    TI__Guru 57697 points

    Hello,

    To configure to use Accumulator mode set [GMSEL1:0] in Operation Config A = 00

    For accumulator mode, there is no requirement to match chemistry of the battery cell.

    If there is leakage current because of the diodes, then that may require special consideration.

    For EOS mode, please check if your battery is listed in the chemistry ID table in bqStudio.

  • 0
    Prodigy 20 points

    Thanks for your quick answer. If you mean the reverse leakage currents are as follows:

    - 3x 1N5819 = max. 1mA

    - 6x 1N4007 = max. 10uA

    The diodes in series 1N5818 have a typical voltage drop of 0.55V.

    The Minamoto ER17505M cells are not listed in your chemistry ID table. Can you add them please? 

    How is it possible to consider the diodes in EOS mode?

  • 0 in reply to L-Unit
    TI__Guru 57697 points

    The leakage will not be counted in Accumulator mode.

    EOS mode may be more suited. You can run the GPCCHEM tool to check if your cell has the same chemistry ID.

    Or you can just initialize EOS mode in the gauge and check if EOS is reported correctly in your application (easier than GPCCHEM for most users).