For my thesis I'm designing a batterypack with 3,2V 50Ah pouch cells. Currently I'm trying to determine the U and Y coefficients for the NTGK battery model. Because I'm not able to do any experiments yet I used a graph delivered by the battery supplier (Voltage in function of time in minutes) as shown in the attachment. I extracted the values from the graph and wrote them in three .txt files (1C;2C and 3C).
With the parameter estimation tool I've readed the .txt files into Ansys. The tool calculated the Y and U parameters as shown in the attachment. As you can see the parameter bo isn't correct because it's shown in a red box. This parameter should be a positive number.
The experimental and fitted results are also attached. As you can see these results doesn't match the graph of the battery supplier at all and I can't figure it out what exactly I'm doing wrong. Thanks.
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