What was this book series called? (about bats)?

Read it like 4 years ago so my memory may be off a little

Basically it was either 2 or 3 books in the series and it was about bats and it was fiction

the 1st was about a young bat who got lost from his pack and is trying to find his way back, he meets a girl bat and i think they make it pack.

the 2nd book(not sure bout this tho) was i believe when the pack gets captured by humans ? and they live in a happy place with food and water but somehow the humans were doing bad things?

the final book was when the young bat turns into an adult and is living happily with his family. something happens and somehow the father bat and his kid bat goes into hell or some place with fire and evil bats? the father sacrifices himself so the kid bat could get out and make it back. the ending was super sad because the father bat returns as nothing and watches over his family ;)