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BQ25890: BQ25890 with 2 Battery

Ray Vincent Aranzaso
Mastermind 18180 points
Part Number: BQ25890

Hi,

Good Day. I have a customer who is working with BQ25890. Please see below his query for your reference. Thank you very much.

We're using a TI bq25890/2 BMS in one of our products with a Lithion-Ion rechargeable battery. We would like to develop a variation of the product that uses a Lithium Polymer rechargeable battery. We saw that the BMS can handle both kinds of batteries. I would like to know if we have to configure the BMS differently for both product variations respectively or if the BMS can adjust itself to the kind of battery that is connected.

We integrated your BMS bq25890/2 in our PCB and connected a lithium ion rech. battery. Is it possible to just exchange the li-ion against a lithium polymer rech. battery? Or would it be necessary to configure bq25890/2 differently to safely do that?

Best Regards,

Ray Vincent

  • 0
    TI__Guru** 105590 points

    Hello Ray,

    If both batteries have the same battery manufacturer specifications for charge current, charge voltage, termination current, then it should be okay. Just make sure you don't exceed the cell manufacturer specs.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    TI__Mastermind 18180 points

    Hi Wyatt,

    Good Day. There is another question from the customer. Please see below for your reference. Thank you very much.

    I'm not sure in case of "Termination current": Does that mean load short circuit protection (45 A here) or charge / discharge current protection (4.46 A here). Please find the attached data sheets of an older and a newer version of the Li-Ion battery we use (NOT the LiPo).

    Datenblatt db-pa-ul-lnb55.pdfNeue Version DB.PA-LNB55-C17UL.4.1.pdf

    Best Regards,

    Ray Vincent

  • 0 in reply to Ray Vincent Aranzaso
    TI__Mastermind 18180 points

    Hi Wyatt,

    Good Day. Additional query from the customer. Please check below. Thanks.

    As far as we know, the "termination current" is the current that is present at the end of a charging phase, when the battery as full.
    Do we need to set a termination current in the BMS? Or does the BMS determine itself when the battery is fully charged by measuring the charging current and eventually lowering the charge voltage?
    Please clarify on your termination current information.

    Best Regards,

    Ray Vincent

  • 0 in reply to Ray Vincent Aranzaso
    TI__Guru** 105590 points

    Hello Ray,

    Sorry I should've been more clear, the charge termination current is more critical for the charger. The discharge current protections are hard set in the charger.

    The termination current is configurable in the charger, it is in REG05 as ITERM. Usually the battery manufacturer gives a recommendation but it doesn't look like the cell linked does. It really depends on the customer desired charge time, the lower the ITERM the longer it takes to charge but the closer the battery will get to the true 100% capacity.

    Sincerely,

    Wyatt Keller