Loewe made 9 of 13 from the floor, including six 3-pointers, and had seven assists.
Battle collected a fourth double-double on 8-of-13 shooting to go with a career-high five assists.
E.J. Stephens added 15 points and Sean Sutherlin 11. The pair had a combined nine assists for Minnesota (13-12, 4-12 Big Ten), which has won two of its last four since ending a five-game losing streak.
Pete Nance scored 18 points and Boo Buie 16 for Northwestern (12-13, 5-11).