A University of Minnesota student accused Richard Liu, the billionaire founder of the Chinese e-commerce giant JD.com, of rape in a lawsuit filed in Minneapolis on Tuesday, four months after prosecutors declined to pursue a criminal case.

The lawsuit, which also names JD.com as a defendant, seeks more than $50,000 in damages. The student, Liu Jingyao, is identified in the complaint as an undergraduate who lives in Minneapolis.

In the lawsuit, filed in Minnesota State Court in Hennepin County, she accused Mr. Liu of forcing himself on her in her apartment on Aug. 30 while he was taking courses at the university.

He was later arrested but released within hours and allowed to return to China. On Dec. 21, the county attorney’s office said it had not found enough evidence to charge him with sexual assault.