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Original question:

BQ34Z100-G1: Unsuccessful Learning Cycle

BQ2060A: NICD Battery Fuel Gauge Selection

Charles Lin1
Intellectual 525 points
Part Number: BQ2060A
Other Parts Discussed in Thread: BQ34Z100, , BQ34110, BQ34Z100-G1

Hi TI supporters,

We have a long testing process with BQ34Z100, but in the end we found it might not suitable for our battery design due to the thermistor connection. We are looking for a battery gauge that is able to detect SOC, SOH, FCC, RC etc. We don't want to make any modifications on the batteries for now, so ideally, we hope these parameters are not generated based on the temperature input of the battery cells. But I cannot find any of them, the best suitable one I found is BQ2060A, which has same thermistor wiring as our battery. I cannot find more details on the limiting conditions for this gauge, like the battery charge capacity, number of cells, etc. I couldn't find this gauge when I searched with TI fuel gauges search tool.

The battery we have is NICD, 20 cells in series, nominal cell voltage 1.2V. And the pack has totally of 7Ah and 168 WH. 

Please advise any better options or if BQ2060A will meet our requirements.

Thanks,

Charles

  • 0
    TI__Guru** 105770 points

    Hello Charles,

    The best options we have for your configuration is the bq34z100-g1 and the bq34110 which is a CEDV gauge that may work better for you. Both of these will require a thermistor for temperature readings.

    You can use the TEMPS bit to choose to use the internal thermistor for temperature calculations if your gauge is very close to the batteries.

    I wouldn't recommend using the bq2060A because it is much older technology.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Intellectual 525 points

    Hi Wyatt,

    The problem is the battery pack has an insulator which isolated the 20 battery cells from outside environment. The thermistor is unable to measure the temperature even touching closely to the appearance of the battery pack. 

    I noticed bq34110 before, but it is also highly depending on the temperature input to the calculate the SOC etc., right? The thermistor connection is same as bq34z100.

    Do you have any information of bq2060A? At least we can know if it is an option or not. I couldn't find any other gauges that work with our battery.

    Thanks,

    Charles

  • 0 in reply to Charles Lin1
    TI__Guru** 105770 points

    Hello Charles,

    There's no other gauges that can support this configuration.

    If you do plan on using the bq2060A we will not be able to support the same as newer gauges. This gauge uses software and hardware (EV2200) that aren't maintained anymore.

    Sincerely,

    Wyatt Keller