Multiphysics Tutorial on mechanical and scalar transport simulation
The example is a multiphysics (solid - scalar transport) simulation. Below you’ll find the structure, which we are talking about.

Geometry of the structure serving as battery.
Note
A battery framework test exists, which could be used as a tutorial, but it has no description yest.
\(\int_{-\infty}^{\infty} f(x) \delta(x-x0) \mathrm{d}x = f(x_0)\)