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BQ35100: SOH measure in Lithoum primary batteries

Gorka Gabilondo
Prodigy 30 points
Part Number: BQ35100

Hi everyone, 

I was wondering what would be the most suitable way for measuring the remaining capacity of a Lithium primary battery with the BQ35100 IC.

In my case I use a LI-MnO2 cr123a primary battery type from Panasonic. According to the datasheet, there are three kind of algorithms to use for measuring purposes: ACC, SOH and EOS. The datasheet suggests to use the SOH algorithm for my battery type, but, what kind of information would give me SOH data for my application? Should I combine this information with another one?

  

Thanks in advance,

  • 0
    TI__Genius 10370 points

    Gorka,

    The bq35100 does not report out remaining capacity. SOH is a percentage of life left, but not capacity based. The only way to really get mAh is using ACC mode. This wont give you mAh left but instead it will tell you how many mAh you have used to date.

    Thanks,

    Eric Vos

  • 0 in reply to Vos
    Prodigy 30 points

    Thanks for your fast response Eric.

    Therefore, could be a relationship between SOH and if the battery is running out? I mean, what kind of information could give us SOH in a primary battery?

    I am focusing in this algorithm because my battery type is Li-MnO2 and ACC drains more power due to the continuous data gathering.

    Thanks,

  • 0 in reply to Gorka Gabilondo
    TI__Genius 10370 points

    Gorka,

    SOH is the relationship for when the battery is getting low. There is just no way to correlate that back to mAh. It is a realtive indicator.

    ACC mode does not report SOH.

    Li-Mn02 does not need to be continuously on. It is intended to only be woken up periodically. SOH is calculated at the wake event. 

    Thank,

    Eric Vos