Hi,
trying to get a chem id didn't work as expected (too much deviation).
So maybe something fundamental is wrong.
We use two sealed Lead-Acid batteries in series (RS 537-5488 12V7.0AH/20HR Web: uk.rs-online.com/.../ ).
They are connected to the bq34z100EVM and i am using the EV2300 and bqStudio (1.3.51) to connect to the eval board.
I've updated the firmware of the bq34z100 on the eval board to bq34z100G1 0100_0_16.
Voltage and current are calibrated and the values that are read out are very exact.
I've calibrated the temperature of the internal sensor today, it was about 2-3°C too high.
I have set the chem id to 0x800 (but want to find the best match using the chemical id selection tool).
This is mainly what i changed:
Data Memory - Configuration
===========================
Design Capacity = 7000 mAh / 6 cells = 1167 mAh
Design Energy = Design Capacity * 2 V per cell = 2334 mWh
Cell charge Voltage Tx-Tx: 2250 mV (?? correct ??)
Pack Configuration:
VOLSET = 1 (external voltage divider)
TEMPS = 0 (internal temperature sensor)
Number of series cell = 12 (6 cells per battery * 2 batteries)
Flash Update OK Cell Volt = 2800 mV (2800 mV × Number Of Series Cells × 5000/Voltage Divider = 4467 mV which is too high and results in an error. In the TI forum they said to just set it to 2800 mV)
Data Memory - Gas Gauging
=========================
Cell Terminate Voltage = 1833 mV (11V / 6 cells)
Qmax Cell 0 = Design Capacity = 1167 mAh
Data Memory - Calibration
=========================
CC Gain = 10175 mOhm (Calibrated for Evalboard)
CC Delta = 10156 mOhm (Calibrated for Evalboard)
Voltage Divider = 37609 mV (Calibrated for Evalboard with 32V Voltage divider!)
Appended is the 0116_0117.zip containing the files for the chemical id selection online tool.
But it responded with an error (0116_0117-report.zip).
The batteries i used for chem id selection are not brand new, could this be a serious problem?
Since i have no external temperature sensor connected to the eval board i used the internal temperature. I have only checked the temperature of the batteries from time to time and they didn't get warm.
How important is the exact temperature of the batteries for the chem id selection? Is it possible to connect an external thermistor to the eval board?
Best Regards
Sebastian