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BQ78350-R1: Chemistry does not included our cell. Do we need to program the battery chemistry if EDV is disabled? LGC 18650-M36T

Adam Botka
Intellectual 455 points
Part Number: BQ78350-R1
Other Parts Discussed in Thread: GPCCHEM, BQSTUDIO, GPCCEDV

Hi all,

I would like to program the battery chemistry, but I dont find our cell.

We use this :

LG Chem Lithium Ion INR18650 M36T 12.50Wh 

Will be the list updated?

Could you write me a spare Chemistry ID or we need to do Gauging Parameter Calculation for CEDV gauges?

If we dont use EDV detection (EDV Compensation is disabled too), it is necessary to set/program the battery chemistry?When do we have to do it necessarily?

Best Regards,

Adam

  • 0
    TI__Guru* 81034 points
    Hi Adam,

    For Impedance Track battery gauges, selecting the correct ChemID is critical for gauging accuracy. However, the BQ78350-R1 is a CEDV gauge (not Impedance Track) and this device only uses the ChemID to estimate the initial Remaining Capacity and SOC upon wake-up based on the battery voltage. Once the device is up and running, the ChemID is no longer used. If your application goes into Shutdown frequency, it might be more important.

    When a specific ChemID is not in the system, there is an online tool that can help you find the closest ChemID match to your battery: http://www.ti.com/tool/GPCCHEM This does require some data collection.
    This video is for a different device, but it covers the process for collecting the data needed for the GPCCHEM tool: training.ti.com/bq40z50-setup-and-going-production

    Best regards,
    Matt
  • 0 in reply to Matt Sunna
    Intellectual 455 points
    Hi Matt,

    Thank you for sharing this video and the link.
    It seems simpler like in the past. Do I have to do this process just at room temperature and not needed to do it at low and high temperature?
    It's a good news.

    Do I collect data with bqStudio in process relax-discharge-relax at room temperature as described, package with config file and upload. Right?

    Many thanks
    Adam
  • 0 in reply to Adam Botka
    TI__Guru* 81034 points
    Hi Adam,

    For the ChemID, it only needs to be done at room temperature.

    For the CEDV parameter configurations, this uses the GPCCEDV tool (not covered in the video). This does need 6 curves (2 loads, 3 temperatures). I think this is the one you may be remembering. This is an important step for this device. http://www.ti.com/tool/GPCCEDV

    A few months ago, I updated this app note to better outline these steps: www.ti.com/.../slua924.pdf
    I will eventually make a video for the BQ78350-R1 since I know this can be confusing.

    Best regards,
    Matt
  • 0 in reply to Matt Sunna
    Intellectual 455 points

    Hi Matt,

    Thank you for your very helpfully answers. Last question to this topic:

    We dont use EDV Compensation and EDV Detection is disabled too. We use "Battery_Low %=0" to disable our load.

    Do we need to use GPCCEDV to config CEDV parameter?

    Best regards,

    Adam

  • 0 in reply to Adam Botka
    TI__Guru* 81034 points
    Hi Adam,

    In this case, you do not need to use the GPCCEDV tool.

    Best regards,
    Matt