Pouch pack Lithium-ion battery modeling problem
 

Hello,
I had saw several articles about Lithium-ion battery analysis.
But there was a weird thing. If the article cover a single cell, it has a tip
and if the article cover battery pack, it has no tip.
why there are difference between them? How can analysis the pouch pack model without any tips? why we can neglect the tips when analize a pouch pack?
and if there are no tip, how can i analysis the battery on fluent?

please see the attachment