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BQ34110: BQStudio Showing 0% Battery Charge but Gauging Correctly

ColinY
Intellectual 455 points
Part Number: BQ34110
Other Parts Discussed in Thread: BQSTUDIO

Hello,

After calibrating my BQ34110 chip and changing data memory values, the chip is now reading current, temperature, and voltage values rather accurately. However, it is continuously showing 0% SoC on the battery gauge icon. While doing 1s calibration the SoC was staying around 95-100%, but when increasing the number of series cells the SoC dropped to 0%. Could someone give advice as to why this is happening and/or how to fix this? Is it a value in the data memory that has been programmed incorrectly? We have not yet done a full discharge cycle, if that's important. We are using a 6 cell, 12 V, 8 Ah, lead-acid battery. I have attached the .gg.csv file (had to convert to a .doc for upload):

bq34110gg.docx

 

Thanks in advance,

Colin

  • 0
    TI__Mastermind 25955 points

    Hi Colin,

    Please ensure the parameters in dataflash for the device are configured with respect to the instructions in the TRM and perform a learning cycle.

    Sincerely,
    Bryan Kahler

  • 0
    TI__Guru* 81034 points

    Hi Colin,

    The problem is that the default flash parameter settings for the device are configured for a Li-Ion battery. There are many parameters that need to be updated for lead acid. I am attaching a spreadsheet that should be helpful to find the new settings. In the first tab, I have input some parameters based on what you have described. In the second tab, you can see the calculated data flash parameters based on these settings. Feel free to modify these, but they are a good starting place for your application. The top of the 2nd tab gives some description on the different color highlights. The 3rd tab can be copied and pasted into a text file (save as .gg.csv) and can be imported into bqStudio.

    I think this should help get you a better SoC value. 2V on a Li-Ion cell would be considered 0%, but for a lead acid cell would be normal.

    /cfs-file/__key/communityserver-discussions-components-files/196/5633.bq34110_5F00_dataflash_5F00_notes_5F00_rev03_5F00_20181002.xlsx

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Intellectual 455 points
    Matt and Bryan,

    Thanks for the advice! We initially used that excel file with very similar numbers and tried importing the .gg.csv file, but for some reason a lot of the numbers were very different than they should have been. After changing each DF parameter manually and making sure they were exactly the same we were finally able to see RC and SoC values.