Other Parts Discussed in Thread: GPCCHEM
Tool/software:
Hi everyone,
So, we have a lifetime test for our battery pack, which cycling (charge and discharge) the battery using a randomize RSOC as a target.
At the first time cycle after learning cycle procedure, the upper target RSOC was 95% and lower target was 15%.
The cell grid was updated along with the RSOC decrement, which indicates that the gauge tracks the DOD and report us through the cell grid (1 - 13) after it passed 11.1% (before knee region).
This can be describe by figure 1.
Figure 1. RSOC vs Cell Grid at cycle count 1.
However, after several cycle further, with large RSOC difference from 90 to 40%, the cell grid was not updating.
The cell grid updated after transition from discharge to charging state.
This can be described on figure 2.
Figure 2. RSOC vs Cell Grid at cycle count 4.
Is there any explanation, how this case happened?
I just attached 3 files, which consist of learning cycle data, data at cycle count of 1, and data at cycle count of 4.
Including the data memory files.
2025-04-17_15.07.02-FirstCycleDataLog-DischargeUntilTermV.csv2025-04-21_05.47.19-QMAX_Docking_1_Batt_0x1c.csv2025-04-21_19.17.30-QMAX_Docking_14_Batt_0x1c.csv2025-04-21_05.47.19-Cycle-1-DataMem.csv2025-04-21_19.17.30-Cycle-14-DataMem.csv