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BQ35100: Will BQ35100 work for reporting Li-SOCl2 state of charge?

Julio Apps
Expert 3665 points
Part Number: BQ35100

Hello Team,

What would the best method to determine when 95% of capacity is used up on the attached battery (Li-SOCL2)? Can the customer read DOD,SOH, current and voltage from the gauge while in the EOS mode and then be able to determine this using an MCU? The application that will be power by this battery will have a wide current draw from uA to 200mA up to an 1A peak currents.

Ultralife-ER14505M.pdf

  • 0
    TI__Guru* 76230 points

    Hi Julio,

    The bq35100 has 3 modes of operation. SOH, accumulator and EOS modes.

    For Li-Socl2 cells, the voltage profile is so flat that you can't use the SOH mode of the bq35100 for it. You have to use the accumulator mode or EOS mode. Unfortunately, you can't use both. In accumulator mode, the remaining capacity and SOC can be determined by subtracting the accumulated capacity from the design capacity. In Eos mode, the gauge will determine SOC based off the resistance profile of the cell. You will have to have the correct chem id for the SOC functionality of EOS mode to work.  You can use any Li-Socl2 chem id for the EOS function only as the gauge is looking at the rate of change of resistance to determine EOS, but the recommendation will be to use the correct chem id so that both the SOH function of EOS and the EOS functionality will be correct

    thanks

    Onyx