Resistance as function of temperature and lifetime

[dguittet]

Currently, the battery resistance is used in the voltage and thermal models. This value is constant over time.

Battery resistance changes depending on temperature and increases over time with use. This data is not always available, but when it is-- as in lifetime studies-- then it would be useful to be able to model this effect.

This could be a simple look up table.

[brtietz]

Existing equation from Kandler's NMC models. Consider adding this.

If lookup table - need user input.

Potential impacts on the temperature model.

[cpaulgilman]

See discussion on SAM forum: https://sam.nrel.gov/forum/forum-general/4139