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BQ40Z50: Adaptive State of Charge Thresholds / BQ40Z50-R2 1-4 series Li-ion battery pack manager

Martin Schelling
Prodigy 30 points
Part Number: BQ40Z50

Tool/software:

Hi TI team,

We have begun defining the optimal approach for safely shutting down our new product in the event of a low state of charge in the battery pack.
I am wondering if we need to set threshold values that take the battery pack temperature into account:

Specifically, does the TI BQ40Z50-R2 fuel gauge already account for the relationship between state of charge and temperature?
In other words, can we rely on the SoC information provided by the fuel gauge without establishing additional limits based on temperature variations?

Thank you for your assistance.

Best regards,
Martin

  • 0
    TI__Mastermind 27405 points

    Hello Martin,

    Yes it is heavily recommend to establish the additional limits based on temperature and this is due to each cell having different temperature limits. The BQ40z50 uses impedance tracking algorithm which takes temperatures into consideration for SOC but the battery gauges doesn't know the upper limit of temperature of the cell meaning that it worst case scenario the cell could be charging/discharging at a temperature threshold within default but be past real safety temperature operation.

    Thank you,
    Alan