• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 39 subscribers
  • Views 233 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

TIDA-01093: Part number of F1 fuse in TIDA-01093

TIDA-01093: Balance time and Balance current

Prathamesh Patil1
Prodigy 230 points
Part Number: TIDA-01093
Other Parts Discussed in Thread: BQ76930

Dear all,

Please provide Balance time and Balance current for TIDA-01093.

Waiting for earliest reply.

Thanks and regard,

Prathamesh Patil

  • 0
    TI__Genius 10830 points

    Hi Prathamesh,

    Please note that the BMS engineers are presenting this week during our yearly BMS Deep Dive in Dallas and may not be able to answer quickly to your question. Thank you for your understanding!

    Please check out more information about this event here, in case you want to join next year.

  • 0 in reply to David Hien
    TI__Guru 54715 points

    Hi Prathamesh,

    The TIDA-01093 uses a 100 ohm external balance resistor, so neglecting the internal balance current the current at 4V would be 4/100 = 40 mA.  You could include the internal current if desired, and consider the voltage at which you will balance.

    The BQ76930 will duty cycle the balancing at 70% to measure during balance, so the effective balancing current is 40 mA x 0.7 =  28 mA.

    If you assume 1 cell drops more than the others and the others need to be balanced down, you can only balance every other cell, so there is a 50% duty cycle for the cells, or the effective balance current is 28 mA x 0.5 = 14 mA.

    So if your pack has a cell discharge 1 mAh more than the others during a usage cycle or other period of time, you will need to balance  1 mAh/14 mA = 0.0714 hours or about 4.3 minutes.  You will have to analyze based on your system design, expected use conditions, and the algorithm you select for balancing.  Of course you will need to also consider that the cell mismatch will show up as a voltage difference, and it may take a larger capacity mismatch before the MCU can recognize an imbalance due to the voltage mismatch.  You may not want to balance based on noise or subtle variation in the voltage reading.