SDAA074 July   2025 BQ27Z561 , BQ28Z610 , BQ40Z50

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Regular Process
    1. 1.1 Time Needed for Chem ID
    2. 1.2 Time Needed for Golden Learning
    3. 1.3 Time Needed for Low Temperature Test
  5. 2Scenarios for Very Tight Schedule
  6. 3How to Shorten the Time
  7. 4Summary
  8. 5References

1.1 Time Needed for Chem ID

For all TI gauges with Impedance Track algorithm, a correct Chem ID is needed. Generally, users need to send the cells to TI Dallas lab for Chem ID characterization. Please contact a local FAE for Chem ID request.

This can take approximately 1 week to send the cells to TI Dallas. This time is not controlled by TI.

Once TI Dallas Chem ID lab receives the cells, TI starts to run tests on those cells for characterization at 25°C, 0°C and 50°C. The basic idea is to charge the cell to full, and then discharge the cell with some amount of capacity, and relax for long enough time so that the cell voltage is stable enough. Then, read the cell voltage, which is the true open circuit voltage (OCV). Repeat discharge. Finally, an OCV VS DOD curve is achieved. The cell needs to be run at three temperatures points: 25°C, 0°C and 50°C.

After the test is finished, TI generates the Chem ID based on the test data. Then, release the Chem ID on TI.com: GASGAUGECHEM. Generally, the ChemUpdater is updated one or two times every week.

Note: All the test steps are run automatically; the time cannot be shortened. This can take approximately 4 weeks.