I'm trying to design a large battery pack, that should provide a given amount of power, with a reasonable amount of heat dissipations. To do so, I have three degrees of freedom:
- indidividual cell capacity
- number of cells in parallel
- number of cells in series
Given an internal resistance, I was thinking of having a lot of parallel branches with cells of low capacity, in order to lower the current (and thus the heat dissipations in RI²).
However, I heard that the product of internal resistance times capacity is constant, meaning that internal resistance increases when capacity decreases.
Is that true? I could not find any confirmations on the net. Is there a more accurate relationship between these two?
Thank you for your help!