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BQ28Z610-R1: I'd like to get a recommendation for a fuel gauge IC.

CHAE WOO LIM
Prodigy 60 points
Part Number: BQ28Z610-R1
Other Parts Discussed in Thread: GPCRB

Tool/software:

Hello,

I am currently using the bq28z610-R1 fuel gauge in a battery pack that is now entering mass production.

Our end users frequently operate the device in both low-temperature and room-temperature environments, so we want a golden image that can account for these varying conditions.

We have already created a golden image at room temperature, and we are now generating a low-temperature-optimized image using the GPCRB tool.

However, I have encountered a concern.

From what I’ve gathered through various Q&A threads in the TI forum, it seems that only one golden image can be applied to a single fuel gauge.

If that is the case, I’m worried that switching between low and room temperatures in actual usage might cause SOC accuracy issues due to limitations in the Ra table.

Is there any fuel gauge device from TI that can store multiple golden images or multiple Ra tables, and switch between them based on temperature sensing (e.g., one for low temperature, another for room temperature)?

Any advice or recommendations would be greatly appreciated.

Thank you.
Best regards,

Chae woo

  • 0
    TI__Mastermind 25225 points

    Hello Chae,

    Golden image would contain two Resistance table for room temp and another for low temp, after completing the GPCRB tool process. During use it would switch between the two tables as the temperature meets certain requirements. 

    Thank you,
    Alan

  • 0 in reply to Alan Frias
    Prodigy 60 points

    Hello Alan,

    As you advised, I updated the golden image using GPCRB and conducted testing, but the issue still remains.


    First, for GPCRB, I used discharge data at room temperature and low temperature (-10℃) down to 3V (the minimum cell voltage), using a relax-discharge-relax pattern.
    → I originally wanted to discharge only down to the actual term voltage of 3.4V.
    → However, when the battery was left at low temperature (-10℃), the voltage dropped below 3.4V and discharged down to 3V.


    Using the resulting chemdata12 and gg_out, I conducted a discharge test at low temperature.


    However, even after applying these, still the battery voltage drops below the fuel gauge’s term voltage of 3.4V at low temperature, so the device shows 0% remaining.


    From what I see, GPCRB only compensates the 'behavior' during operation in low temperatures.


    So in the end, is lowering the term voltage the only option to use a single battery in both low and room temperature environments?
    Please let me know if I’m misunderstanding anything or if you have any suggestions.

    best regards,

    Chae woo

  • 0 in reply to CHAE WOO LIM
    TI__Mastermind 37761 points

    Hello Chae,

    I am not understanding what is happening. Can you send me a log file showing the behavior?

    Regards,

    Adrian