The Arrhenius constants α and β

Well,

the ln is nothing else than the logarithm to the base e.

But if a logarithm has the same argument as its base, that is equal to 1 
by definition.

That means, divide K(T,ref) and R(T,ref) to switch it on left side.
Now multiplicate with ln (left and right side. That means for right side 
follwing facts:
ln^(e) = 1
1 × your alpha oder beta term. The alpha and beta part comes now out / 
down from exp. part.
For left side you have to consider the ln calculation rules: 
ln(R/R(T,ref)).
The Temperature terms on the right side can you easily handle with a 
division and you will get alpha and beta free.
I hope that helps you.

Ah ok,.. for my understanding:

You should find out the R and K value over a thereotical estimation or 
lab trials. For my opinion: alpha and beta are open values which are 
maybe not further defined in Simulink. Well, more details are given in 
literature, or Simulink Help Section for a definition  of different 
battery material setups? But, i dont know it sure.

Marouen B. schrieb:

(The only question was how I alpha and beta) x -1 = Fatal error