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BQ78350: The step to get the capacity

Cherry Zhou
Mastermind 22235 points
Part Number: BQ78350
Other Parts Discussed in Thread: GPCCEDV, BQSTUDIO, ,

Hi team,

The customer would like to figure out the following questions:

1.The parameters EMF, EDVC0, EDVC1, EDVR1, EDVR0, EDVT0 are obtained after the low and high temperature light load. Max error is still 100% when the EDDTC is populated in BQstdio, why is that?

And what additional parameters are required to implement the Max error change?

2. The capacity of the charged and discharged battery is still not accurate after the high and low temperature light load of the CEDV battery. Are there any specific steps to get the capacity correctly?

3. The following are the CEDV parameters for the output, several of them VOC75, VOC50, VOC25, and the OCV corresponding to the SOC, the customer cannot dose not know where to put them in BQstdio.

Do the following parameters need to be populated in BQstdio?

Could you help resolve this case? Thanks.

Best Regards,

Cherry

  • 0
    TI__Guru* 81034 points

    Hi Cherry,

    The Max Error is 100% until there is a full qualified discharge to EDV2. Then it is updated. The only 7 parameters that need to be updated (after they have uploaded their discharge waveforms to the online GPCCEDV tool) are these:

    The other parameters output from the GPCCEDV tool are not used for the BQ78350-R1A. If they are not seeing the Max Error get updated correctly or if the capacity learned is not accurate, then maybe they can collect a log file (click the 'Start Log' button in the BQStudio register screen). I can help to debug what is happening.

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    TI__Mastermind 22235 points

    Hi Matt,

    Thanks for you reply.

    The customer would like to know how can EDV2 achieve a fully qualified discharge. After EMF, EDVC0, EDVC1, EDVR1, EDVR0 , EDVT0 , EDVTC is filled into BQstdio, and then charge and discharge with a protective board, is it ok?

    After EMF, EDVC0, EDVC1, EDVR1, EDVR0, EDVT0, and EDVTC has been filled, the capacity will still change suddenly, from 90% to 60%.

    Are there any specific steps to get the capacity correctly? No placement of OCV found in BQstdio, do the OCV parameters for SOC need to be populated in BQstdio?

    Thanks and Best Regards,

    Cherry

  • 0 in reply to Cherry Zhou
    TI__Guru* 81034 points

    Hi Cherry,

    The Gas Gauging section of the Using the BQ78350-R1 application document describes the steps in more detail. The BQ78350 initially uses the ChemID to estimate the SOC based on the cell voltages. So the ChemID needs to also be programmed in BQStudio. After a full qualified discharge (the conditions for a full qualified discharge are described in the Gauging section of the BQ78350-R1A TRM), the new capacity will be learned. 

    Best regards,

    Matt