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Why would a UR18650FM get a Chemistry ID 0135 for bq20z95 ?

Michael Banak
Intellectual 915 points

In bqeasy version 1.80, Sanyo's UR18650FM is assigned chemical ID 0100, which is a kind of default for 18650 cells.

In bqEasy V1.87, UR18650FM is assigned chemical ID 0135. I wouldn't question this development, except I am having trouble training my bq20z95. The capacity is spiraling into the weeds, going higher rather than lower, right now about 2x what it is supposed to be.

I have loaded another chemical ID, 0107, which is assigned to a similar 18650. So far, we are doing well.

Meanwhile, I noticed that the Chemical ID 0135 is also assigned to a very different cell, the UF103450. You may see a description here:

http://www.alibaba.com/product-gs/250752866/Li_ion_103450_battery_cell_Sanyo.html

This battery is physically different than the one we are using, and the capacity is much different (1800 vs 2500). I cannot explain why TI would point us to a chemistry file for such a strange cell.

Is there even a *slight* possibility that the assignment of the UR18650FM to chem ID 0135 was in error?

Gratefully,

Michael A. Banak

 

 

  • 0
    TI__Genius 10235 points

    The 18650FM cell should probably not be assigned to ID 135. ID 135 is a special ID that was made at -20C, 25C, and 50C rather than the usual 0C, 25C, and 50C. I can't find any log indicating that we characterized the FM cell here at TI, which means we most likely received data from a customer, it matched ID 135, and then it was added to the selection list. I also don't see the FM cell under ID 100.

    If you would like, you can run a rel-dis-rel test yourself (takes about a day) using the attached zip file. If you don't have Mathcad, you can send us the data.

    If ID 107 is working for, you than you can probably just continue using it. There generally isn't a big difference between the different ID 1xx chemistries. Most are within 5%-10% of each other.

    chemselect_cont.zip
  • 0 in reply to Chase7071949597
    Intellectual 915 points

    Thank you, Chase, for that encouraging information.

    My own less-recent bqeasy has an entry for the FM cell at ID=0100. I have inserted a screen shot below. My associates screen (v1.87) looks different, indicating the odious 0135.

    From what you have told me, the 0135 ID assigned to the FM cell was likely taken from customer data and then posted-up, since your records show thatTI has not modeled it yet. This amazes me. That 0135 looks like a rouge entry then. My client has just said OUCH!

    We are continuing with the 0107, and so far so good.  I will cease fretting over what that 0135 is all about, and just focus on what is working for me.

    For my own archives, I am pasting the original inquiry, and your generous reply below.

    Gratfully,

    Michael A. Banak

     

     

    Chase wrote the following post at Fri, May 20 2011 4:04 PM:

    The 18650FM cell should probably not be assigned to ID 135. ID 135 is a special ID that was made at -20C, 25C, and 50C rather than the usual 0C, 25C, and 50C. I can't find any log indicating that we characterized the FM cell here at TI, which means we most likely received data from a customer, it matched ID 135, and then it was added to the selection list. I also don't see the FM cell under ID 100.

    If you would like, you can run a rel-dis-rel test yourself (takes about a day) using the attached zip file. If you don't have Mathcad, you can send us the data.

    If ID 107 is working for, you than you can probably just continue using it. There generally isn't a big difference between the different ID 1xx chemistries. Most are within 5%-10% of each other.

     

     

    Michael Banak posted Why would a UR18650FM get a Chemistry ID 0135 for bq20z95 ? in Battery Management - Gas Gauge Forum.

    In bqeasy version 1.80, Sanyo's UR18650FM is assigned chemical ID 0100, which is a kind of default for 18650 cells.

    In bqEasy V1.87, UR18650FM is assigned chemical ID 0135. I wouldn't question this development, except I am having trouble training my bq20z95. The capacity is spiraling into the weeds, going higher rather than lower, right now about 2x what it is supposed to be.

    I have loaded another chemical ID, 0107, which is assigned to a similar 18650. So far, we are doing well.

    Meanwhile, I noticed that the Chemical ID 0135 is also assigned to a very different cell, the UF103450. You may see a description here:

    http://www.alibaba.com/product-gs/250752866/Li_ion_103450_battery_cell_Sanyo.html

    This battery is physically different than the one we are using, and the capacity is much different (1800 vs 2500). I cannot explain why TI would point us to a chemistry file for such a strange cell.

    Is there even a *slight* possibility that the assignment of the UR18650FM to chem ID 0135 was in error?

    Gratefully,

    Michael A. Banak