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BQ34110: I have Gauge Development Kit and the EVM for this device. How do I profile it using bqStudio?

Trevor White
Intellectual 270 points
Part Number: BQ34110
Other Parts Discussed in Thread: BQSTUDIO,

It looks to me like I can not create a learning profile for my battery pack using the bq34410EVM and the Gauge Development Kit platform and bqStudio? 

What do I do to profile my battery pack please, the documentation does not seem obvious to me. 

Trev

  • 0
    TI__Intellectual 1840 points
    Hi,

    The GDK (Gauge Development Kit) is not compatible with multi-cell gauges, it is only compatible with single-cell ones. I'm assuming you're trying to obtain the Compensated End of Discharge Voltage (CEDV) coefficients for the specific battery profile. You will needed to use the online GPC (Gauge Parameter Calculator) to obtain these coefficients, but you will first need to create 3 pairs of log files containing the data from discharge runs for 3 different temperatures.

    You may log the data using bqStudios and your EVM, but you will need external equipment to charge and discharge the battery.

    Here is the document/link showing how to work with the GPC:

    www.ti.com/.../sluub45a.pdf
    http://www.ti.com/tool/GPCCEDV

    Hope this helps,
  • 0 in reply to Nabil M
    Intellectual 270 points
    Thank you for the reply. I am using the bq34110 with 2p pack so the voltage levels are within spec for the GDK

    To enable me to measure capacity of the battey I assumed I needed to create a golden image of the battery pack?

    Creating three different temperature profiles is not a straight forward approach, is this the only way?
  • 0 in reply to Trevor White
    TI__Intellectual 1840 points
    Hi Trevor,

    You don't need to create a golden image to measure capacity with bqStudios. The whole point of a golden image is that after the automated process or evaluation is done and the optimal parameters for a specific battery profile are obtained (CEDV coefficients included), they can be programmed into Data Flash to create a golden image that can be used in mass production of battery packs.

    You should be able to measure the capacity and assess the accuracy through bqStudio; you don't necessarily need to have made a Golden Image. But keep in mind that the accuracy of the gauge in measuring a specific battery profile depends on having the proper CEDV coefficients.

    And yes this is the only recommended technique available of obtaining the optimal parameters for accurate gauging.

    Hope this help,
  • 0 in reply to Nabil M
    Intellectual 270 points
    Thanks for the answer.

    I did not think I would need a temperature chamber to enable me to profile a battery. Is there an easier fuel gauge that I can use with a LiFePO4 2p pack?

    The battery pack is used in a backup situation so I need to ensure health of the battery long term and on accasion when it is used I will need to know the SOC for smart reporting back to the system.

    Trev
  • 0 in reply to Trevor White
    Intellectual 270 points
    I might be able to sort a temperature of 3C, would that be good enough for a 0C test profile or do I have to get it to 0C?
  • 0 in reply to Trevor White
    TI__Intellectual 1840 points

    Hi Trevor, 

    The low, room, high temperatures are based on your application's temperature range. So your low temperature doesn't have to be 0 C, it's going to be the low temperature you'd want your application to operate in; this can be 5 C or 3 C or even 7 C, it all depends on the application. 

    As for different or possibly easier fuel gauges, you could check out our catalog at:

    www.ti.com/.../battery-fuel-gauge-products.page

    The fuel gauges using Impedance Tracking (IT), as opposed to CEDV, do have a different process at obtaining optimal parameters and don't require a temperature chamber, but do require charging and discharging during their learning cycle. You may find them easier to work with as their profile learning process doesn't require a temperature chamber.

    If the CEDV seem to be unsuitable to work with, I recommend you check out our IT gauges as they also provide higher accuracy. 

    Hope this helps,