Mercedes says Chinese supplier to build U.S. battery plant for EV production in Ala. Mercedes says Chinese supplier to build U.S. battery plant for EV production in Ala. March 15, 2022 dzadmin Comments 0 Comment Mercedes, which did not disclose the location of Envision’s new U.S. cell factory, also flipped the switch on a new battery assembly plant located on 270 acres near its vehicle factory.