I am using IFR13-EP1500 cells, 4 in series, 4 in parralel.
They have a typical internal resistance of less than 39mohm, according to the datasheet.
I did a run of the .AUX file generation tool, and the result surprises me a lot. The software keeps telling me that the impedence is between 204 and 1464 milliohms.
204 # Ra[ 0]
236 # Ra[ 1]
270 # Ra[ 2]
289 # Ra[ 3]
263 # Ra[ 4]
308 # Ra[ 5]
422 # Ra[ 6]
578 # Ra[ 7]
681 # Ra[ 8]
753 # Ra[ 9]
831 # Ra[10]
1044 # Ra[11]
1108 # Ra[12]
1316 # Ra[13]
1463 # Ra[14]
According to BQ78PL116 datasheet :
The R a table consists of 15 values of cell impedance, stored in milli-Ohms, that are a function of cell SOC.
Each series cell can have a different R a table depending on its measured performance. Each entry in the
table is referred to as a grid point, N, where N = 0 to 14. The lowest SOC grid point is N = 14 and the
highest SOC grid point is a N = 0. Spacing between grid points are in 11.1% increments of SOC until
23.3% SOC, and then 3.2% increments of SOC until approximately 0%.
To my understanding, the number before the Ra is equal to 1 milliohm, so my cell is 200mohm of resistance, at best ?
What is wrong with my understanding of that ?
Thanks for any help provided
included below is the input file to the AUX file generation wizard, and the out.aux output. I used generic cell, 4 series, 4 parralel, 405.chem and 3000ma initial current
