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BQ34Z100-R2: Data Configuration, Lead - Acid Battery

Part Number: BQ34Z100-R2

Tool/software:

Hello,



Description of the problem:

I'm trying to correctly set up the parameters in the BQ memory. I have many doubts whether the values I'm entering are correct, so I would appreciate verification and possible correction.

I performed the calibration. I chose the Chem ID based on what I think is correct. Soon, I will carry out the test necessary to determine the Chem ID using GPCCHEM. Before starting the learning cycle, I would like to verify whether the parameters I entered are correct and if the number of modified parameters is sufficient. Maybe I missed something. According to the SLUA903 document, the amount of provided data seems to be fine.

Data:

Lead Acid Battery: 12V 72Ah,

Design Voltage:  2100 mV [12.6V/6],                                       I'm wondering if the value should be 12V.

Design Capacity: 7200 mAh [72 000mAh/10],           

Design Energy: 15 120 cWh [72 000 mAh * 2.1V)/10],            I'm wondering if the value should be (72 000 mAh x 12V) / 40 = 21 600 cWh.

Cell Charge Voltage T1 - T2: 2550 mV,  

Cell Charge Voltage T1 - T2: 2450 mV,

Cell Charge Voltage T1 - T2: 2350 mV,

Number of Cells: 6,

Current Scale: 10,

Energy Scale: 10,

Volt Scale: 6,

Flash Update OK Cell Volt: 1000 mV,

Cell Termination Voltage: 1750 mV,

Tapper Current: 800 mA,

Quit Current: 40mA,

Dsg Current Threshold: 1000 mA,

Ch Current Threshold: 0 mA,

VOLSEL:  set 1,

Load Mode: 0,

LOAD SELECT: 3.


  • Hello MJ,

    Can you share with me the data sheet for the battery you are using?

    Regards,

    Adrian

  • Hello Adrian,

    Unfortunately, the battery does not have good documentation; the manufacturer does not provide information about the cells and their voltages, nor is there any information about the charging and discharging currents. It is an AGM battery, and the starting current of 680A is provided, but that’s all.

    Regards,

    MJ

  • I use Bosh S4007 12V 72Ah 680A, Manufacturer Part Number: 0092S40070

  • Hello MJ,

    The setting look good, besides for one.

    Ch Current Threshold should not be set to 0mA, I would recommend setting this to 500mA.

    Regards,

    Adrian

  • Thank you, Adrian, for your comments. Could you also clarify my doubts regarding the Design Voltage and Design Energy parameters? Should the calculations be performed for a single cell or for the entire battery pack?

  • Hello MJ,

    Design Voltage and Energy is for a single cell.

    Regards,

    Adrian

  • I have conducted a test necessary to determine the ChemID. The battery I am using is not on TI's list. The message from the GPCCHEM calculator is as follows:

    Thank you for your interest in the Gauging Parameter Calculator from TI.
    There was an error in processing your report. The specific error encountered is:

    The following errors were reported by the calculation engine:
    Accuracy Error: Deviation is so high that it is most likely due to anomaly in the data. Please check that data files have recomended format, units and test schedule.

    I am attaching the report, along with the test data. Was the test I conducted correct? The report doesn't indicate that, and the proposed ChemID is completely different from the one I am using [Lead-Acid].


    GPCCCHEM_12V_72Ah-report.zip
    8463.roomtemp_rel_dis_rel.csv

    2287.config.txt
    ProcessingType=2
    NumCellSeries=6
    ElapsedTimeColumn=0
    VoltageColumn=1
    CurrentColumn=2
    TemperatureColumn=3


    Regards,
    MJ

  • Hello MJ,

    Let try this one more time. Let's do the test again but this time lets discharge the battery at -3600mA, to be closer to the C/10 discharge that is required. I fear that it is not matching to a good ChemID because we don't have a similar battery in our database.

    Regards,

    Adrian

  • Hell Adrian,

    1. So, if I conduct a test with a C/10 current of about 7200 mA, the GPCCHEM tool might not indicate the correct battery chemistry type because it is not in the TI database? Will it show me the correct chemistry if I conduct the test with a 7200 mA current, but it is not 100% matched to my solution?

    2. What will happen if I choose a Chem ID corresponding to a lead-acid battery that is different from mine? For example, if I choose ChemID 817 for my battery, will I be able to complete the learning cycle procedure?

    Regards,
    MJ

  • Hello MJ,

    1. That is correct. You could complete the GPCCHEM test 100% accurately according to our test procedure and not get a good ChemID match. The report does not need to show a chemID is it is not closely matched with any ChemID in our database.

    2. I can not answer this as their are many variables that goes into a successful completion of the learning cycle. However, I will say that the learning cycle should not be attempted unless the ChemID is a good match with the battery you are using.

    Regards,

    Adrian