Learning Forum

[nitinchauhan93]

Hello,

I am trying to model a Cylindrical Lithium ion cell using MSMD battery model (by NTGK empirical model). I have 3 discharging curves for 4 different temperature levels. When I use the parameter estimation tool to input the files, a (warning: Y-value for DOD = .......... is negative, please check the input data!) comes up (see image). These warnings come up for each temperature.

[wcao]

Hi Nitin The reference capacity is explained in the theory guide:
The link is here: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v211/en/flu_th/flu_bat_model_ECMs.html
Please make sure you are supplying the discharging data to the parameter estimation tool. If possible, can you share the plot of your discharging data? Usually such error is directly related to the the data you used. Thanks.

[nitinchauhan93]

Thanks . Really appreciate your help. I attached the voltage vs time graph which I am using. The Y-axis is the voltage and x-axis is the Time in seconds. I am giving each of these graph separately in TGK parameter estimation tool. Any help would be helpful.