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BQ34Z100-G1: SoC of battery shows 0 % even after cycling,

Karlis Tucs
Expert 1385 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: GPCRB

Hi, we are using custom made battery packs with BQ34z100-G1.

One of our batteries shows 0% even after first full charge. The battery is at customers office so I can not access it to read the data.

I have never experienced something like this with BQ34z100-G1.

What might be the solutions? Try to discharge/charge it again?

Or only way to deal with this is to get the pack to our office?

Best regards,

Karlis Tucs

  • 0
    TI__Mastermind 25955 points
    Hi Karlis,

    To analyze we will need the gg.csv files and a log from the device. Also, Please provide more information with respect to cell count, application loads, temperature of operation, etc.

    Is your customer trying to use the pack in very cold temperatures?

    If your customer is tech savvy, you may try to have them perform a learning cycle:
    If the battery is Li-ion, and the battery has reached equilibrium (room temperature), have the customer discharge the battery to empty and allow the battery to fully relax. Allow the cell to sit for at least 5 hours then charge the battery to full at a C/2 rate (please tell them in terms of current). Ensure the battery is charged to full. Allow the battery to fully relax, this will take at least 2 hours. Then, attach the battery to a C/5 to a C/10 constant current load and discharge the battery to empty. Once again, allow the battery to fully relax for 5 hours. Charge the battery and the device should have learned.

    Sincerely,
    Bryan Kahler
  • 0 in reply to Bryan Kahler
    Expert 1385 points

    Hi Bryan.

    In attachment you can see gg file, but I can not get any log files from device now.

    S4P34 Li-ion 114Ah.. Load, something around 12W, C/142 load current. It's very big battery with very low load. Charging current C/11  = 10A.

    This customer wont have access to these kind of chargers and loads, all he has is our load and charger with specs described above. 

    Customer is using packs in around -2 degrees celsius to +10 degrees celsius. which is not that cold, we have packs working for a long time in much colder temperatures, so that should not be the problem.

    Best regards,

    Karlis Tucsbq34z100-g1settings.rar

  • 0 in reply to Karlis Tucs
    TI__Mastermind 25955 points
    Hi Karlis,

    For further investigation the packs will need to be analyzed. This could be as simple as requiring a tweak to the chemID using the gpcrb tool, or more difficult, but the logs will be required to determine.

    Sincerely,
    Bryan Kahler