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BQ27542-G1 , can I use this for Primary lithium-thionyl chloride (Li-SOCl2)

Tanjila haque
Prodigy 20 points
Other Parts Discussed in Thread: BQ27542-G1

Hi

Can I use BQ27542-G1 ,  for Primary lithium-thionyl chloride (Li-SOCl2) for power management.  I want to use 2 battery in parallel.  how can I get the model for (Li-SOCl2).

Thanks

  • 0
    TI__Expert 3385 points
    Hi Tanjila,

    This gauge will not be suitable for this chemistry. The OCV profile is too flat for acceptable gauging performance with an Impedance Track gauge.

    Best,
    Justin
  • 0
    TI__Guru* 76230 points
    Hi Tanjila,
    You will want to consider using our CEDV gauges as a coulomb counter for gauging this primary cell. We have an app note that describes the process. See link below.
    www.ti.com/.../slua367.pdf

    You could also use the bq27542, although it will primarily serve as a coulomb counter in this case and the benefits of impedance track will be limited. You will be faced with challenge of the flatness of the OCV curve of this cell like Justin pointed out.

    thanks
    Onyx
  • 0 in reply to Onyx Ahiakwo
    Prodigy 20 points

    Thank you Justin and Onyx. 

    The flatness of OCV curve ismaking me confused about what I should use. do you have any specific part number that may be the best suits for this? I need to know when I should change the battery. like when the battery is drain about

    80%  I need to change the battery.  Is there  any other way to calculate for this chemistry ? The device for which  am using the battery will most of the be on standby. how accurate its gonna be if I just  use pre-measured standby current and calculate remaining capacity  using equation in firmware time to time?

    Thanks 

    Tanjila