Hi,
I have a problem with the learning process part of making a golden file for my battery. The [VOK] bit is not setting after the initial discharge and rest period.
The initial discharge is done with C/3 current (this current is not specified in the learning process document) and the battery is resting until the IT Status:[REST] bit is set and left for a few more hours.
When I start to charge the battery the IT Status:[VOK] bit is not set automatically which in turn does not update QMax when resting after charging.
The steps are the same as in the SLUA848 document:
1. Send the GAUGE_EN command to set the [QEN] and [GAUGE_EN] bits high
2. Send RESET command to set [RDIS] bit high
3. Check to see if LStatus() is 0x4 (only the [ITEN] bit is high)
4. Discharge the battery to empty
5. At end of discharge the [TD] and [FD] bits are high and the [EDV] is high when the Term Min Cell V is reached
6. Rest until [REST] bit is high, sometimes the [RDIS] bit did not clear even after more than 5 hours
7. Start charge, the [VOK] bit doesn't set
The battery used is a Tattu LIPO 12000mAh 15C 22.2V 6S1P.
Battery voltage range 19.2-25.2V (3.2-4.2V per cell)
Nominal voltage 22.2V
The GPC report for this battery said that the best Chem ID match is 5201 with a 1.33% deviation.
The GPC_report, gg, and log file of the discharge, rest, charge, rest are attached.
Tattu_12Ah_Learning_process.gg.csvTattu_12Ah_Learning_process.log
Chemistry ID selection tool, rev=2.52 Configuration used in present fit: ProcessingType=2 NumCellSeries=6 ElapsedTimeColumn=0 VoltageColumn=1 TemperatureColumn=2 CurrentColumn=3 Best chemical ID : 5201 Best chemical ID max. deviation, % : 1.33 Summary of all IDs with max. DOD deviation below 3% Chem ID max DOD error, % Max R deviation, ratio 5201 1.33 1.25 1669 1.66 1.05 1138 2.02 1.19 1939 2.03 1.85 298 2.05 1.62 1146 2.06 1.62 2634 2.08 1.58 5166 2.19 1.3 1279 2.2 3.34 2597 2.32 1.07 2341 2.41 1.38 2029 2.73 5.25 2071 2.93 1.66 1222 2.97 5.33 Max. deviations for best ID is within recommended range. Chosen best chemical ID is suitable for programming the gauge. Selection of best generic ID for ROM based devices like bq274xx Device / Family #1 Generic Chem ID Device/ Voltage/ Chemistry max DOD error, % 3142 bq27421-G1D: 4.4V LiCoO2 12.12 354 bq27411-G1C: 4.35V LiCoO2 12.41 128 bq27421-G1A: 4.2V LiCoO2 101.93 312 bq27421-G1B: 4.3V LiCoO2 110.81 Best generic ID 3142 Warning: Deviation for best generic ID is above recommended level for this device / family. Consider using another device, flash based gauge or RAM programming of custom ID. Device / Family #2 Generic Chem ID Device/ Voltage/ Chemistry max DOD error, % 1210 bq27621: (ALT_CHEM1) 4.3V LiCoO2 12.06 1202 bq27621: (default) 4.2V LiCoO2 12.14 354 bq27621: (ALT_CHEM2) 4.35V LiCoO2 12.41 Best generic ID 1210 Warning: Deviation for best generic ID is above recommended level for this device / family. Consider using another device, flash based gauge or RAM programming of custom ID. Device / Family #3 Generic Chem ID Device/ Voltage/ Chemistry max DOD error, % 3142 bq27426: (ALT-CHEM2) 4.4V LiCoO2 12.12 1202 bq27426: (ALT_CHEM1) 4.2V LiCoO2 12.14 3230 bq27426: (default) 4.35V LiCoO2 13.68 Best generic ID 3142 Warning: Deviation for best generic ID is above recommended level for this device / family. Consider using another device, flash based gauge or RAM programming of custom ID.
