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BQ34Z110 as general-purpose SOC and RM meter

Jonas Baikas
Prodigy 50 points
Other Parts Discussed in Thread: BQ34Z110

I would like to know if BQ34Z110 could be used as a general-purpose SOC and RM meter for lead acid batteries. Would it be possible to use random lead acid batteries and read their SOC and RM without setting any specific parameters (except nominal voltage and FCC) about those connected batteries? What level of accuracy could be expected in such cases?

In addition, it is noted that AverageCurrent parameter is updated every second. How can this parameter remain accurate when short period high current spikes are introduced?

  • 0
    TI__Guru 73830 points

    Jonas, 

    The device is not designed to be connected to an arbitrary PbA battery and provide accurate gauging. You need to program an acceptable ChemID into the device and run and optimization cycle to trim the Ra table to the cells. This will need to be redone when the battery is changed to a different model.  

    The device does average the Current over the one second window and update the value every second. The AverageCurrent is averaged over a longer window and updated every second. Spikes can will not be reported at their flu values, but they should increase the current estimate. 

    Tom

  • 0 in reply to ThomasCosby
    Prodigy 50 points

    I have tried your supplied program (bq34z110 Evaluation Software). It seems that you do not update it frequently (last update was almost two years ago) and hence there are only 3 lead acid batteries to choose from. Do you have ChemIDs for other batteries or is that all there is?

  • 0 in reply to Jonas Baikas
    TI__Guru 73830 points

    Jonas,

    We have eight PbA ChemIDs in the portfolio now. You can run the Chemistry Updater to update the files on your computer. Search for Chemistry Updater in the Ti website. Use the set file for the Gas Gauge Chemistry files.

    Tom