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Battery Chemistry choice

Rakesh Muralidharan
Expert 2810 points
Other Parts Discussed in Thread: BQ27510EVM

Hi,

 

I couldn't identify the chemistry match for my battery using the math cad tool. The Qmax read was 1466.(from the mathcad tool)

I am using this Qmax data and conering on Chemistry ID0111 (1590mah) as my chemistry.

Wat will be the impact on capacity determination. Will it affect my capacity prediction???

I am using Bq27510Evm.

  • 0
    TI__Intellectual 2100 points

    Rakesh,

    I ran through the chemistry ID process and look into the innards of our tool that we provide.  The closest Chemistry matches are ChemID 101 and ChemID 113.  (101 is the best).  The tool had disqualified these values because it believed that there might be some issues with impedance measurements.  However, the MathCAD tool is fairly conservative, so I recommend trying a learning cycle with ChemID 101 first, and then ChemID113 if that does not work.

    Log your learning cycle.  If it succeeds then you are OK.  If RUP_DIS gets set during the discharge cycle, post the log here and I'll look at it.  If everything looks OK and RUP_DIS is still getting set, it is likely that your cell has a new chemistry ID that is not in our database.  We can contact you directly to see how to proceed from there.

    Let me know if this helps,

    Charles

  • 0 in reply to Charles Herder
    Expert 2810 points

    I ran the chemistry cycle(rel-dis-rel) once again on BQ27510evm. When u mentioned errors in impedence measurements I measured wire reistance which was a bit alarming. I have rectified those issues and re-run the whole cycle.

    When I ran the math cad tool on the new log file , tool returned the the same error  (best chem , maxerror  unidentified variable) 4645.BQ275_Chem_log_raw_file _Submit to TI.log

    I did't try battery learning cycle with the suggested chemistry (101,113). please confirm your earlier conclusions. Actually our battery is Li-ion , and on the battery label its printed 3000maH,no details on which load current though. It is nothing but an extended Nokia BP-4L battery.

    Please confirm the chemistry ID with the newly generated log file.If it matches then I will proceed with battery learning cycle.

    Also Once I load default .dfi file I have the reclaibrate the whole BQ27510EVM right!!!!. Is it possible to calibrate and create a new .dfi file which could be used as default .dfi now on. This would avoid the hassles of calibrating EVM again and again from now on.

    please help me .