The Czechs entered Sunday's action with a commanding 2-0 lead over host Germany and extended their lead to an insurmountable 3-0 advantage when the world No. 2 Kvitova came from behind to beat Sabine Lisicki 6-7 (2-7), 6-4, 6-1 at Stuttgart Arena.
Kvitova has now won her last 27 matches on hardcourts.
Angelique Kerber finally got the Germans on the board with a 6-4, 6-4 victory over Czech Lucie Hradecka in a dead rubber on Day 2, while the tie wrapped up with a meaningless doubles victory by a Czech tandem of Iveta Benesova and Barbora Zahlavova Strycova, who beat a German duo of Julia Goerges and Anna- Lena Groenefeld 6-3, 7-6 (7-4) to cap off an easy 4-1 Czech win.
On Saturday in Stuttgart, Benesova and Kvitova each won three-set thrillers in the opening singles, as they topped Lisicki and Goerges, respectively.
The Czechs are now 6-1 all-time against Germany, which has captured the Fed Cup twice in its history. The Czechs won last year's crown by beating Russia 3-2 in the final.
The Czech Republic will host Italy in April's semis.