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BQ34Z100-G1: Can i use BQ34Z100-G1 Device for Higher capacity battery or other chemistry?

BingXie
Intellectual 360 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQ34Z100, GPCCHEM

Hi.

i have a project that make a 5% accuracy SOC gauge of Li type battery for up to 100Ah 48V 200A current pack.

This is a project which a very sensetive of the BOM cost and energy cost, which is why trying to use this devices,

There are possible of different Battery packet up to 48V 100Ah and 200A max current which is much higher than the design of this deivce.

  Is that possible to use a bigger shunt to measure the current so this device still work with big battery?

Can we make our own config file for a customized Battery Pack of the Chemistry Config? like Li（NiCoMn）O2 type battery if TI does not support this file?

Thanks and best regards,

  • 0
    TI__Mastermind 42535 points

    Hi Bing,

    The device with such applications will have to implement scaling which is non native to the gauge. Therefore your 5% accuracy will be compromised. The gauge is flexible with cell chemistry but does not support such high capacity.

  • 0 in reply to Batt
    Intellectual 360 points

    Hi Batt

    When running the software "Texas Instruments bq Gas Gauge Evaluation Software",  in "bqChem" page with BQ34Z100 chip, we can select the Chemistry of the battery, such like Lishen LP44147272 battery ( ID 0434) are 130Ah. So i think this device should be able to work for higher capacity.

    In another way, if the battery we want to use does not have data in TI library, can we create our own file/library/config for a new battery instead of choosing a exist config file from Ti list?

    Please let me know if you have any questions,

    Thanks and best regards,

  • 0 in reply to BingXie
    TI__Mastermind 42535 points

    Hi Bing,

    Yes, but with scaling you will lose resolution which will cause loss of accuracy. That is why I advised you of this issue. I your cell is not listed in the TI chem db, you can use the GPCCHEM tool to find out the closest match for your selected battery. The instructions are on the page here, http://www.ti.com/tool/GPCCHEM

  • 0 in reply to Batt
    Intellectual 360 points

    Hi Batt

    Thank you for your help.

    All those information is a very good start point for me.

    Thanks and best regards,