What does RC parallel branch does in ECM of Li-ion Battery?

When I try to make a ECM of Li-ion Battery, I am almost forced to use RC Parallel branch to represent Li-ion battery. What 'is' the actual work in the circuit?

Answer 1

[Suhan]

You can refer to the research papers mentioned in the following documentation for a detailed explanation: https://www.mathworks.com/examples/simscape/mw/simscape_product-ssc_lithium_cell_2RC-lithium-battery-cell-two-rc-branch-equivalent-circuit