A valve is a one time only device to prevent an explosion in the event of thermal runaway. It’s not going to accommodate the slight expansion and contraction wh

A valve is a one time only device to prevent an explosion in the event of thermal runaway. It’s not going to accommodate the slight expansion and contraction which are a normal part of the charge cycle for lithium batteries. If the battery is kept under mechanical pressure in order to avoid movement (without the use of an adhesive) then there is no place for the battery to expand to. That sounds like a recipe for disaster.