• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 320 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.

bq40z60EVM battery always 100 %

Remco
Prodigy 40 points
Other Parts Discussed in Thread: BQ40Z60EVM-578, BQSTUDIO

Hi,

I want to build a BMS for 3 LiFePO4 batteries (A123 1100 mAh, ID 0404).

I’m using a bq40z60EVM-578, EV2300 and bqStudio (1.3.35).

Charging and discharging works fine (auto stop if a cell reach a limit), only the battery is always 100%????

Need I set a register? I use the default values (loaded chemistry 0404).

  • 0
    TI__Guru 73830 points
    It is common for LiFePO4 cells to experience overshoot during charging, especially if they are not well matched. The overshoot usually reduces as the cells a cycled. You can reduce the charging rate to minimize the risk that one will overshoot. The cell balancing circuit can also help after the Update Status has reached 0E. You can also increase the COV threshold to allow more margin.