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Questions related from Praveen Kumar Kuppusamy
Hi, At 1C-rate, I am doing OCV test on A123 li-ion cyclindrical cells to measure capacity & internal resistance. At the end of discharge cycle how long is the pause time after which I can...
08 August 2018 8,528 2 View
I am performing EIS (BRS Messtechnik, galvanostatic) on cyclindrical A123 26650 LFP full cell. After setting SOC it is required to wait for some hours before carrying out EIS. I know it is to...
06 June 2018 9,072 0 View
Hi, I have 9 26650 LFP cells connected in series and impedance is measured one after the other using BRS EIS device. Currently I have soldered the batteries, but the EIS spectra is not a good...
05 May 2018 5,375 0 View
I have set of Electrochemical Impedance spectroscopy data of Lithium ion full cell (26650). Then I do Kramers-Kronig fitting using Lin tool of KIT. But this tool allows one cell after another...
04 April 2018 7,669 0 View
Hi, I have about 100 excel.xlsx file and wanted it to read with some Scilab xls or csv function. I could read this excel xlsx format. Also I don't want to use the import data format as I have...
04 April 2018 1,621 0 View
Hi, Similar to Matlab xlswrite(filename,A), what is the function name in Scilab to write on a new excel file ? I tried searching, but couldn't find out. There was only write_csv...
04 April 2018 5,504 2 View
Hi, file='Data.xlsx' M=xlsread(file) Now I want to create a text file of the same name as in the excel name fileID=fopen() Can anyone tell what command comes here ? like sprintf or something...
04 April 2018 6,283 6 View
Hello, I have 100*10 matrix. I don't need the first 13 rows (they are strings). I need all data from 14th row. One columns (6) contains string which I don't need. Can anyone tell me how to read it...
04 April 2018 8,687 0 View
Hi, Anyone knows where I can get sample EV's drive cycle data like mentioned in the picture ? I will need time,current,voltage values.
03 March 2018 794 2 View
Hi, I have matrix 'x' (see pic) with 5 values. Out of those one value deviates from the rest. So when I take the mean, standard deviation and plot with errorbar in Matlab, the deviation seems to...
03 March 2018 383 3 View
I am using equivalent circuits (see pic) to fit 26650 LFP's current pulse measurements. We know that as SOC increases, the resistance decreases. But at the same time, the capacitance of double...
03 March 2018 6,510 2 View
I am using equivalent circuits to fit 26650 LFP's current pulse measurements. We know that as temperature increases, the resistance decreases because of the ion's mobility. But at the same time,...
03 March 2018 179 9 View
Hi, I have one 50*3 matrix (see picture). I separate the first 10 *3 values into another matrix, then the next 10 to another and similarly divide them to 5 matrices. I separated this manually....
03 March 2018 3,237 8 View
Hello everyone, I used Matlab uigetdir to import all my excel data files and convert it to txt document. All the files are converted successfully from excel to txt format one after the other. But...
03 March 2018 9,487 0 View
Hi, I want to do equivalent circuit fitting of Impedance measurements done of Lithium ion cell (A123 26650 LFP 2.5 Ah). Can anyone tell me an ideal circuit. Since I have many such measurements, I...
02 February 2018 256 3 View
Hi, When I try to plot in Scilab, no graphic window is generated (see pic). This is a simple plot between two columns of one matrix. Sometimes, I get error saying 'invalid index'. Does anyone know...
02 February 2018 4,852 4 View
Hi, I try to load text files into EC lab software to do EIS analysis and fitting on lithium 26650 cell. But whatever I do, I get the same error message 'Cannot load data ... .txt file'. I have...
01 January 2018 9,080 0 View
Hello experts, At x °C, x SOC I did Electrochemical Impedance Spectroscopy on 2.5 Ah Li-ion battery (Full cell) and followed by discharge current pulse (2C) measurements. I fitted EIS through...
11 November 2017 2,987 4 View
Hello experts, I have 100 sets of impedance data plots (data from Lithium ion battery). We know that there are many softwares like Zsimpwin Program, Zview, or EC-lab software to fit equivalent...
10 October 2017 8,109 4 View
I am using 2 RC Equivalent circuit model (Time domain) to fit discharge current pulses of Lithium ion battery (full cell). So basically the sum of R0 (ohmic) + R1 (charge transfer) + R2...
10 October 2017 8,991 2 View
BMS records/ processes the data obtained from the battery packs. When these data is compared to the battery model, what's the maximum acceptable accuracy/RMSE in terms of mV or % ? Additional...
09 September 2017 7,495 2 View
I am using 2RC Equivalent circuit model to fit discharge current pulses of LFP cell. I use 4 pulses (8C, 4C, 2C, 1C). The RMSE is good for 2C and 1C~5mV, but for 4C and 8C it seems to increase...
09 September 2017 9,094 3 View
I am using four (8C,4C,2C,1C) discharge/charge pulses to characterize LFP cell. Basically at 0% SOC, cell doesn't accept 8C charge pulse ? Only rest three pulses can be given. Could any one tell...
09 September 2017 3,253 3 View
Hi experts, We know LIB are used for EVs application. Ni-MH can't be employed in EVs because of their low cell voltage and can't be connected in parallel to draw power. Anyone knows why we can't...
09 September 2017 3,733 0 View
Hi experts, I am using 2RC Equivalent circuit battery model (time domain) to fit 26650 LiFeP cell data at 25,50,0 °C. When I compare between these 3 temperatures, 50 °C has highest capacitance...
09 September 2017 4,371 1 View
I am fitting Lithium ion battery's discharge current pulses with 2RC equivalent circuit model. Need help from someone with literature or books where it explains all the 5 circuit elements (OCV,...
08 August 2017 8,084 0 View
I validated Lion 26650 battery data against 2RC equivalent circuit model. The RMSE seems to improve with high temeparature ie good results for 50 deg, then 25 deg and 0 deg had bad results. What...
08 August 2017 4,440 6 View
Is there a way to convert Matlab simulink BD to .eps format ? or any other way of representing this diagram in high quality picture ? Thanks
07 July 2017 2,859 10 View
I have a set of discharge current pulse values (Voltage vs Time) as well as Impedance Spectroscopy data of Li-ion battery. How could I transfer these pulses to frequency domain and fit with other...
06 June 2017 8,570 3 View
I am comparing simulated vs experimental values of Current pulse discharge test of LiFePo4 2.5Ah battery. The maximum error value I get is 21mV and mean is 10mV. Is it acceptable ? What is the...
06 June 2017 6,837 0 View
I am using Lithium 2RC Matlab model. Does anyone know how to compare this model output to experimental data and find out the Root mean square error values ?
06 June 2017 2,571 0 View
I am using A123 26650 LFP battery. How do I calculate the time constants (tau) from Voltage time graph of battery. I am using 2RC equivalent ckt model. Thanks
05 May 2017 8,845 1 View
