Other Parts Discussed in Thread: , GPCCHEM
Tool/software:
Hello everyone and Texas support,
I'm working with the bq40z80 IC on my custom board and the bq40z80EVM-020 evaluation board. I'm using an Efest 18650 lithium-ion 3500mAh 3.7V battery. also, I'm using a battery configuration where two 18650 cells are connected in parallel, and then three of these parallel pairs are connected in series (3S2P), forming a total of three effective cells that are connected to the bq40z80. I selected the nearest Chem ID to my battery and set the memory program, voltage, current, and design voltage. Everything seems fine in this setup.
According to the "How to Complete a Successful Learning Cycle (SLUA848)" document, I am trying to complete the learning cycle.
First step: I discharged the cells completely and let them relax for at least 5 hours.
Second step: I enabled Impedance Track (0x21) and issued a reset command (0x41). The LStatus() changed from 00 to 04, which worked as expected.
Third step: I charged the cells to full, ensuring the [FC] bit was set, and then let them relax for at least two hours. At this point, Qmax should update, and LStatus() should change to 05.
However, after fully charging the battery and allowing it to relax, the LStatus did not change to 05. What could be causing this issue?
Additionally, I ensured that the DOD (Depth of Discharge) of the battery cells did not exceed 90% during charging and discharging. How can I resolve this?
