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BQ27426: Using it for Alkaline cell gauging

Ignacio Majcherczyk
Prodigy 160 points
Part Number: BQ27426
Other Parts Discussed in Thread: GPCCHEM, BQ35100

Tool/software:

Dear all

I'm designing a system that has to run either from Li-ion batteries or a pack of 3Xseries D size Alkaline cell battery pack

The chemistry switch is made from a version change to the PCB (some parts not mounted for alkaline battery operation) so there's no need to automatically detect the chemistry

My question here is if I can use the BQ27426 in order to gauge the Alkaline pack. Is some chemistry file available to upload to the chip and make it aware of the alkaline cells?

Or should I rely on the voltage register to know the battery SOC ?

Any suggestions for this case?

Thanks in advance

Ignacio

  • 0
    TI__Intellectual 2020 points

    Hello Ignacio,

    The BQ27426 is a Single-Cell Li-Ion gauge and is preprogrammed to support only 3 chemistry profiles. The gauge does not support Alkaline cells.

    There are no ways to program a custom profile other than the preprogrammed (3230, 1202 and 3142) for Li-ion cells. You could use the GPCCHEM tool to check if the Li-Ion cells match one of the chemistry profiles supported by the gauge.

    Regards,

    Siddharth

  • 0 in reply to Siddharth Venkatesan
    Prodigy 160 points

    Hi Siddhart

    And aside from the chemistry profiles, can the BQ27426 used to read at least the Alkaline battery voltage? My concern is about the voltage that may have a fresh pack (around 5V)

    Regards

    Ignacio

  • +1 in reply to Ignacio Majcherczyk
    TI__Intellectual 2020 points

    Hello Ignacio,

    This gauge will not work with Alkaline cells since the battery chemistry profile is not preconfigured for it. You can use a Primary Cell gauge like the BQ35100. While this gauge mainly supports lithium thionyl chloride or lithium manganese dioxide cells, you can still use Alkaline cells if you configure the gauge to work in Coulomb Accumulation mode.

    Regards,

    Siddharth