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BQ35100: End-Of-Service Mode

Gustavo Adono
Prodigy 80 points
Part Number: BQ35100

Tool/software:

 
I am using a Li-SOCl2 battery along with the BQ35100 battery monitor, and I have some questions regarding its operation.

My goal is to identify the end of the battery's life, and from what I understand, this can be done using the "End of Service" mode. In this mode, is it possible to track the accumulated current or the amount of charge consumed from the battery? For example, I have a 15,000mAh battery, and I would like to know how much of that capacity has already been used.

The purpose is to inform the user when the battery needs to be replaced. If there is another operating mode that would be more suitable for this purpose, could you guide me? I am open to suggestions.



  • 0
    TI__Mastermind 37761 points

    Hello Gustavo,

    When using the bq35100 in End of Service mode, you are not able to track how much pass charge been discharge from the battery. In this mode, the gauge is tracking the internal impedance of the battery throughout it's life. Li-SOCL2 battery chemistry has a characteristic that towards the end of life of the battery the internal impedance of the battery will start to rapidly increase. The gauge uses this fact to determine when the battery should be replaced. If you want to read more about this and test that can be run, please read this document: https://www.ti.com/lit/an/sluaal7/sluaal7.pdf

    Regards,

    Adrian

  • 0 in reply to Adrian
    Prodigy 80 points

    Understood.

    After reading the application note, I understand that it is necessary to measure the scaled resistance and impedance, but it is still unclear whether the gauge needs to be reading continuously during the test or if only the maximum and minimum values are sufficient.

    I am planning to use an electronic load to discharge the battery to its safe operating limit.

    Is this procedure correct?

    Additionally, once the battery profile is known, would it be possible to estimate the remaining charge percentage?

  • 0 in reply to Gustavo Adono
    TI__Mastermind 37761 points

    Hello Gustavo,

    The gauge does not need to continuously read during the test. Only once to take a reading of impedance when the device is powered up.

    Yes, it is perfectly fine to use an electronic load.

    It could be possible to estimate the remaining charge percentage, however, any calculations will most likely not be accurate.

    Regards,

    Adrian