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BQ27742 -- Impedance Track suitability for long term charge

Rob Rodrigues
Mastermind 19780 points

Hi Team,

I have an application where a single charge in a pack is expected to last 7 to 8 years in a device that is located outdoors which means it will be subject to seasonal temperature fluctuations.

Would the DOD, SOC, or TTE values fluctuate drastically due to pack temperature? 

The concern is, if the gas gauge is queried in the summer, it will give a different TTE/DOD/SOC than if it is queried in the winter.

Also, is there a way to disable under-voltage protection for the bq27742 device?

 

Regards,

  • 0
    TI__Guru* 76230 points

    As per already discussed in person,

    The gauge is able to track the cell temperature given that the circuit has external thermistors for temperature measurement and incoporate it in the gauging algorithm. Also, the customer has to make sure that the cells are characterised by TI for  the lowest temperature range the application is expected to be used in. The gauge has a smoothening feature that prevents steep drops in SOC. It is possible to disable undervoltage protection using the UV  prot delay. it's not advisable to do this as the cell could be damaged if severely discharged.

    thanks

    Onyx