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BQ34Z100-G1: Gauging Parameter Calculator using BQ studio log

Jagbir
Expert 1525 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQSTUDIO, BQ34110

Hi,

Can I use BQ studio (v1.3.52) ' Start Log' option to generate the zip file to be used for Gauging Parameter Calculator. Can anyone list down the steps to be followed for a 48V Lead Acid battery pack.

 Are the following steps valid for a lead acid battery pack also.I got the following steps from sluc138dj 'chemselect_cont.pdf' document.

1. Assemble a battery pack from a cell stack and EVM with a bq20zXX or

bq275xx battery gauging device. Thermistor must touch the battery cells, use

thermistor connections with flexible wires to do so!

2. Connect EV 2300 to the battery pack using SMB (or I2C, or HDQ connection

depending on the communication device uses )

3. Start EV Software

4. Start EV Software logging. Alternatively use external tester such as Arbin to log

time, voltage, current and temperature. Voltage must be measured with better than

1mV error.

5. Charge cell to the manufacturer specified voltage,

until taper current reaches C/100

6. Wait 2 hrs

7. Discharge at C/10 rate to manufacturer specified termination voltage

(use 3V if unknown)

8. Wait 5 hrs

9. Use chemselect_cont.mcd worksheet to find chemical ID (MathCad 11 or higher is

needed). After opening worksheet in mathcad, change column assignments for

t,V,I,T to match actual data-file column numbers.

  • 0
    TI__Expert 4450 points
    Hi Sinph,

    Yes, you could use the start log in bqstudio to generate the zip file. And the document sluc138dj also work for lead acid battery. Please arrange your log data according the the document instructs.

    Best regards,
    Sammi
  • 0 in reply to Sammi Shang
    Expert 1525 points

    Sammi,

    Since I am using 4 similar batteries in series (48V) so do I need to characterize the 48V pack or just the one 12V battery.

     

    Thanks,

    Jagbir

  • 0 in reply to Jagbir
    TI__Guru 73830 points
    The chemistry data is stored and used on a cell basis in the gauge, so you do not have to re-characterize the cells. One issue that users have had with stacked PbA packs is the the resistance of the straps connecting batteries will contribute to the series resistance in Ra table updates. This resistance does not have the same linearity as the cells over current and temperature, so this can cause gauging errors. You may want to consider the bq34110 device. It uses a CEDV gauging algorithm and the straps have less impact on gauging accuracy.