This marks Battle's second stint as an assistant coach as he previously served on Penn State's coaching staff from 2020-21.
Brown is transferring from Temple, where he played eight games for the Owls in the 2024-25 season.
Penn State was previously ranked 13th in the USA Hockey Poll.
The announcement comes after the Nittany Lions secured a spot in the Frozen Four on Sunday.
The Nittany Lions dropped three spots after their loss to Maryland over the weekend.
Both teams went to the national semifinals last season.