Other Parts Discussed in Thread: GPCCHEM, BQEVSW, BQSTUDIO
We use the TI battery gauge bq27531 in one product line. We have succesfully completed the ChemID characterization with our test bench and the GPCTool for the first batch of battery cells. However, we need to use another battery cell now which apparently differs in its electrochemical properties. The GPCTool does not find a good match. It ends up with a deviation of just around 2,5 - 3,5% from run to run. (For the first batch of batteries, repeated use of GPCTool led to deviations of 'only' 1,5-2,2%)
Best chemical ID : 2079 Best chemical ID max. deviation, % : 3.35
Summary of all IDs with max. DOD deviation below 3%
Chem ID max DOD error, % Max R deviation, ratio
0 0 0
Warning: Deviation is above recommended level. New chem ID needs to be released for this cell. Please contact your TI representative to send the cell to Dallas for characterization
So, the question is: Do we need a new chem ID characterized by your engineers in Dallas? What are the conditions for that?
Best regards, Nils Larsen