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BQ35100: Accuracy of BQ35100 over temperature

Timothy Starr
Expert 2445 points
Part Number: BQ35100

Hello TI-

We are considering the BQ35100 for monitoring a Lithium Thionyl Chloride battery pack with 2-10 series cells. The data sheet says that it is highly accurate, but what accuracy can we expect?

Is this accuracy degraded at 85 degrees C versus 25 degrees C?

The operating temperature is listed as -40 to +85 degrees C, but the functional limit is up to 100 degrees C. Could you please explain the difference?

When configuring the GG file; do we need a cell ID? 

Thanks and Best Regards,

-Tim Starr on behalf of EJ@EC

  • 0
    TI__Guru* 76230 points
    Hi Tim,
    Someone will respond to this shortly

    thanks
    Onyx
  • 0
    TI__Genius 10370 points

    Hi Tim,

    1) Optimal performance is captured at 25C, but our characterization of cells is done at 0C and 50C. The further you get away from these three values error is increased, however characterization can be done at different temperature ranges if it is needed. i would recommend you try the gauge in the situation and see if the performance is acceptable. 

    Accuracy for this type of application is hard to describe it greatly depends on the application type and situation. End of Service is accurately detected based on the rapid increase of impedance during application use.  

    2) The Functional limit is the max temp we have characterized our parts to work. our recommended temperature range is -40 to 85. It is possible to have the device keep working from 85 to 100 but accuracy errors will grow. 

    3) Yes it is important to have a correct chem ID in order to properly gauge the battery. it is possible your battery already exists in our chemistry database. If not you can have cells shipped to our characterization team please let me know if this is something you will be needing more information on. 

    Thanks,

    Eric Vos