Hello,
I have simulated a single battery cell using Thevenin equivalent circuit. For a battery pack, I have a large number of cells connected in series and parallel connections. Is there any way to find equivalent resistance and capacitance for a battery pack? So that I can model the whole battery pack using equivalent resistance and capacitance values.
Or is there any other relatively simple way to simulate the battery pack rather than connecting large number of cells in series and parallel connections?
Your help is appreciated.
Thanks,
Good Evening,
There is a very analytical way to find a battery internal resistance. You have to measure the current using a known value resistance, commonly 1 ohm or 10 ohms.
How does it work?
ok, let's consider you have a battery having voltage 1.5V(Measured with Multimeter). Now you have a 10 ohms standard resistor (Again measured by multimeter).
So according to ohm's law, the exact current should be measured as 150mA. But in practice, it will be < 150mA. The difference will help you to measure internal resistance (Rg).
let's say you found 149mA. that means the total resistance will be 10.067ohm. Hence the battery internal resistance is 67 mOhm.
For simulation, you can add that value for each battery unit as an extra load and your simulation will have the least possible error. I think it will help you. Have fun!!
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