Many familiar with lithium-ion battery technology will say that it breathes as a byproduct of routine charge/discharge cycles.
However, few methods exist to quantify the internal stress this activity may have on battery life and performance.
If Li-Ion Battery Stack Pressures are Too High?
If Li-Ion Battery Stack Pressures are Too Low?
Higher rates of capacity fade
Plastic deformation/delamination from internal pressure
In extreme cases, thermal runaway
Too much movement for thermal expansion in the housing.
Summarized from: Cannarella, J., Arnold, C., “Stress Evolution and Capacity Fade in Constrained Lithium-Ion Pouch Cells”Journal of Power Sources. 245 (2014) 745-75 https://doi.org/10.1016/j.jpowsour.2013.06.165
Now, here's where the I-Scan™ pressure mapping system fits in.