EV battery maker QuantumScape inks a big new deal with a global automaker.QuantumScape (QS 30.31%) and Volkswagen today announced a new deal that has the electric vehicle (EV) battery start-up's stock soaring.The news pushed QuantumScape shares higher by as much as 34% Thursday morning. As of 11:05 a.m. ET, the stock was still trading up by 29.2%.A potential EV battery game changerThe two companies aren't strangers. Volkswagen was an early investor in QuantumScape hoping that it can successfully commerciali ...