• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 3 answers
  • Subscribers 63 subscribers
  • Views 280 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

BQ27542-G1: Issues during the capture of the logs in Chemical ID generation

Mahek Delawala
Prodigy 120 points
Part Number: BQ27542-G1
Other Parts Discussed in Thread: EV2400

Hi Team,

We are using BQ27542-G1 fuel guage IC in our project . For the callibration we are first generating the Chemical ID but with the procedure given by TI . But during this, we observe that in logs we are not getting Average Current with positive or negative value in Charging and Discharging of Fuel Guage. The Tool shows negative value of current in Display Icon but it is not reflected in the log File.

Another question is what is meant by relaxation mode according to TI in Chemical ID test ?

And the last question is do we need to write into the Data memory before starting the test for getting the Chemical ID ?

Regards,

Mahek

 

  • 0
    TI__Guru 52115 points

    How about other readings like temperature and voltage? Do they seem normal?

    Relaxation mode means the battery is not charging or discharging. Basically, no current flows into or out of the battery.

    Chem ID is all about the characteristic of the battery you are going to use.  You don't need to write to the data memory.

    Take a look at this guide below.

    http://www.ti.com/lit/an/slva725a/slva725a.pdf

  • 0 in reply to Andy Liu (BMS)
    Prodigy 120 points

    Hi Andy,

    Thanks for your quick response.

    We performed one test for generating chemical ID for our cell as per the steps recommended by the TI. Based on this test, the best Chemical ID which we received from the report was 3596. When we search in the list of Chemistry from Battery Management Studio we found the capacity to be 2600 mAh and nominal voltage of 4.35 V. But the capacity listed in its datasheet is 12000 mAh and nominal voltage of 3.7 V. Can you please help us on this ?

    I am attaching the log file for the test and the test report which we received from the TI. I am also attaching the screenshot from my Battery Management Studio

    for this. 

    Regards,

    Mahek

    gpc_chemid_data_0-report.zip3051.roomtemp_rel_dis_rel.csv 

  • 0 in reply to Mahek Delawala
    Prodigy 120 points

    I would like to ask one more thing here, when I start the Battery Management Studio (Version - 1.3.86) and select my device (bq27542-g1) in Project selection, it displays pop as attached below.

    Can you please explain, what is wrong here ?

    Regards,

    Mahek

  • 0 in reply to Mahek Delawala
    TI__Guru 52115 points

    I assume you were using our bq27542-g1 EVM.  Follow the steps we mentioned in the bq27542-g1 EVM and properly set up your board.  Also, remember to use the i2c port of the ev2400.

  • 0 in reply to Mahek Delawala
    TI__Guru 52115 points

    That matching Chemical ID means that the OCV table and resistance table this is corresponding to that chem id matches your battery most.

    After your load the Chem ID,  the next thing to do is the learning cycle.  Before the learning cycle runs,  certain parameters need to be configured specifically to your application and your battery type in the gauge data flash. For example,  the design capacity and design voltage.