• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 65 subscribers
  • Views 404 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

WEBENCH® Tools/BQ34Z100EVM: regarding learning cycle for bq34z100-evm

manoj sai
Expert 2305 points
Part Number: BQ34Z100EVM
Other Parts Discussed in Thread: BQSTUDIO, GPCCHEM

Tool/software: WEBENCH® Design Tools

Hello Everyone,

iam testing battery of model : lead acid , 12v voltage , 1.3Ah capacity.

i am able to get voltage in bqstudio. 

regarding getting  remaining parameters to do learning cycle?

if capacity of battery is 1.3 Ah , we have to discharge the battery of C/5 means , 1.3/5=0.26 A . so i have to discharge 0.26A in one hour , so i has to connect 46ohm resistor ? is it correct.

then what about charging.

  • 0
    TI__Genius 10830 points
    Hi Manoj ,
    Thank you for your interest in our products. A BMS expert has been assigned to your question.

    Regards,
    David
  • 0 in reply to David Hien
    TI__Genius 14985 points
    Hi Manoj,
    Before you run your learning cycle you should identify which chemID (battery profile) is the closest match to your pack by following the instructions in the GPCCHEM tool on ti.com. For lead-acid we recommend you use a C/20 discharge rate to acquire the log to feed into GPCCHEM. (For Li-ion and NiMh you would use C/10.)
    Once you find the best matched chemID using GPCCHEM, use the Chemistry plugin in bqStudio to program that profile into your EVM.
    Then you are ready to run your learning cycle, typically using a C/5 load. An electronic load is the best way to do these discharges, but a power resistor can also work. A very important point is to not overdischarge your battery (especially on Li-ion, where the cell can be damaged or the under-voltage protection can trip and cause your EVM to lose power). You need to stop your discharge when it reaches empty and allow the cell voltage to relax for a few hours while you continue logging the EVM.
    Please use bqStudio to log all Registers continuously before, during, and after your discharges to help with debug and analysis.
    You can also set bqStudio to autoexport .gg.csv files periodically (for example, every 15 minutes) during your testing. The autoexport period can be set in the Preferences menu of bqStudio. Then you can see when specific items were updated in dataflash.

    Your calculation of 46 ohms is reasonable. Make sure your resistor is rated for that much power and please don't burn yourself. :)