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BQ28Z610: Battery Chemistry Settings

Craig Barker
Prodigy 60 points
Part Number: BQ28Z610
Other Parts Discussed in Thread: BQSTUDIO, GPCCHEM

We are using the bq28z610 battery gauge chip with two Samsung ICR18650-22FM batteries.

This exact battery part number is not listed in the bqStudio Chemistry Programming list. 

However, a similar battery ICR18650-26H is listed with Chemistry ID 2077.

 (1)    Can we assume Chemistry ID 2077 will work with our battery, since it is the same part number (just different dash number) to one listed?

(2)    What do we need to do in our manufacturing to get the 2077 chemistry database into the chips on our production boards?

(3)    If we can’t use the 2077 database, how do we generate a new database?

 

  • 0
    TI__Genius 10830 points

    Hi Craig,

    I wanted to let you know that your post has been assigned to one of our applications engineers. This week takes place our annual Battery Management Deep Dive event for which all our engineers are all hands on deck. He will be able to your post early next week, once this event is over.

    You can check out recordings of much of the material we present at www.ti.com/deepdive

    Thank you for your understanding!

  • 0 in reply to David Hien
    TI__Mastermind 42535 points
    You can try to generate a chem ID match by using the GPCCHEM tool. Once you follow the instructions there, you will be able to find out a matched ID for your cell.
  • 0 in reply to Batt
    Prodigy 60 points

    Thanks, that answers the part of the question about using the existing chemistry ID:  We can't use it.

    For the other parts of my question, once I have found a chemistry ID using GPCCHEM, what do I do after that?

    It is not clear from the documents I have been able to find how I use the chemistry ID number to update all the bq28z610 chips that get installed on the boards in production.

    Craig

  • 0 in reply to Craig Barker
    TI__Mastermind 42535 points
    You program that ID using the chemistry plugin in bqstudio and run your learning cycle. After that once you have the golden srec, which has both Qmax and Ra learned, you can go into production using that for other gauges.
  • 0 in reply to Batt
    Prodigy 60 points
    Batt,
    If we pick a battery that has already been determined to conform to chemistry 0100 (the default), does that mean we would not have to do any programming in production? If this is true, we would prefer to just use a battery with ID 0100 and keep production simple.
    Craig
  • 0 in reply to Craig Barker
    TI__Mastermind 42535 points
    Yes and no. Yes, because you don't have to update the chemistry. No, because if you don't have a golden image with a cell from the same manufacturer with same physical dimensions and same chem ID, design voltage capacity etc, you will have to do a learning cycle and get a golden srec generated for production.

    If you already have a golden srec with chem ID 100 and the new cell has the same characteristics as mentioned above, then you can go to production with your old golden srec without any change.