Hyundai sulfide stack pressure 3 MPa
I posted before this article about Hyundai's pressure module for sulfide solid state cells.
https://electrek.co/2024/01/02/hyundai-patent-all-solid-state-ev-battery-system/
Looking now at Figure 4 of the actual patent, you can see actual stack pressure for this module is 3 MPa
https://patents.google.com/patent/US20230420764A1/
SK On and Hyundai are partners, and Hyundai has said it is testing Solid Power's cells in modules, which was posted here earlier.
https://www.reddit.com/r/SLDP/comments/1c1f12i/hyundai_further_explained_that_the_a_sample_was_a/
For reference, current cells operate between 0.02 MPa - 0.5 MPa
https://multimedia.3m.com/mws/media/2351233O/ev-cushioning-white-paper-article.pdf
but every advanced cell will have to accommodate volume changes during cycling.
Also the module / pack level has to survive much higher pressures ~ 70 MPa
https://en.byd.com/news/byd-announces-all-its-pure-evs-will-now-come-with-blade-batteries/