8880.selectChemID.logHello TI:
I use the Mathcad Worksheet to select Chemistry following the steps as application note book:
2. If the cell is an unknown type, follow these steps to complete a Cell Chemistry Selection Cycle. This
cycle is known as a "rel-dis-rel" cycle for more accurate chemistry selection. The bqEASY™ software
(version 1.36 and older) uses a 4-point chemistry auto-selection cycle, and sometimes it is not
accurate enough for some applications. It is recommended to use "rel-dis-rel" cycle instead.
(a) Start EVSW (Start → Programs → Texas Instruments → bq Evaluation Software), and click the
DataRAM button.
(b) Start data logging with a time interval of 10 seconds (SLAU448).
(c) Charge the cell to full (4.2 V) to a taper current less than C/100.
(d) Let the cell relax for 2 hours.
(e) Discharge the cell at a C/10 rate until the cell voltage reaches 100 mV above cell cutoff voltage.
(f) Let the cell relax for 5 hours.
(g) Save the log file.
(h) Download and install the Mathcad™ Chemistry Selection Tool from the TI Product Folder to
calculate the closest matching chemistry ID. This is a Mathcad worksheet and requires you to have
Mathcad installed on your computer. The Mathcad worksheet needs to be modified to move the
"EVSW format for bq27500" section copied below the "Arbin Columns Assignment" section in order
to match the EVSW datalog format. You also need to select your log file as the input file instead of
the default. Instructions are included in-line inside the Mathcad worksheet.
(i) Run the Mathcad worksheet tool on your log file to get the closest matching chemistry ID.
But the worksheet work error.I don't know why.
I has spent 10 days in this matter and our time is very tight.
So Can You help me to select correct Chemistry ID.
Thank you very much for ever
Best Regards!
