Lithium Pouch Cell Expansion
I'd expect that any reaction that liberated gas would not be a well controlled or controllable one or one that was properly reversible. I'd expect gas liberation to be a sign that you had pushed the system beyond its reversible limit and that you were seeing products of charge cycle degradation. I may be wrong :-). 


  So what you are saying is that as long as I don’t pull all 200a, the battery should be fine?



As above re what I know :-)   
I'd love to see a data sheet - any links?   
I'd not expect a reputable manufacturer spec a battery to a level where they had recoverable gassing, and certainly not to irrecoverable gassing. But, I may be wrong. – > 


NB: They say here:  "... ALSO THESE ARE MORE SAFE THAN 18650 CELLS BECAUSE WHEN THEY ARE SPENT THE BAG EXPANDS. ..." 

My comment above re gassing comes from the Batteryhookup.com site and the same blurb appears on their ads in several places. The gassing is "an end of life" indication. They say "60% off new" –