December 17, 2019 at 4:17 pmBatterySubscriber
For my thesis I'm designing a batterypack for an application. 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 functon of time in minutes). You can see the graph below. I extracted the values from the graph and wrote them in three .txt files (1C;2C and 3C). Completely below the text files are shown.
With the parameter estimation tool I've readed the .txt files into Ansys. The tool calculated the Y and U parameters as shown below. I also added the model options (50Ah 3,2V pouch cell). 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 shown below. As you can see these results doesn't match the first graph at all and I can't figure it out what I'm doing wrong.
Text file 1C rate (time in seconds | voltage in V):
Text file 2C rate:
Text file 3C rate:
This is how the console looks like and what I've entered as input parameters in Ansys:
And here are the DOD in function of the U and Y parameters:
December 24, 2019 at 1:50 pm
March 10, 2023 at 8:52 amsalih kayaSubscriber
hi did you solve the problems? ı have the same problem, and ansys doesnt helping :/
March 13, 2023 at 9:43 amRobAnsys Employee
You emailed us on 3rd, and were pointed here within about 10minutes, it's then taken a week for you to post the above into a thread from 2019. I'm assuming you've read https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v231/en/flu_ug/flu_bat_MSMD_sec_use_battery_model.html%23flu_bat_MSMD_sec_NTGK_input
March 24, 2023 at 9:28 pmsalih kayaSubscriber
link is not opening, ı have no custemer id
March 27, 2023 at 12:23 pmRobAnsys Employee
Click on Help, then paste the above into the browser that opens.
March 27, 2023 at 12:32 pmsalih kayaSubscriber
when ı click on help, it wants custemer id
March 27, 2023 at 12:43 pmRobAnsys Employee
Clicking on Help in Fluent requests a customer ID?
May 30, 2023 at 11:26 pmabdur raheem adamSubscriber
hi, i am doing the same battery capacity for my project as well. i have the data for internal resistance vs SOC. can i do parameter estimate or Y or U table from my data? or should my data only be in time and voltage as mentioned above?
May 31, 2023 at 10:16 amRobAnsys Employee
You'll need the data in whatever format Fluent requests: I don't know if what you have is sufficient.
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