NOVELTY - Vehicle propulsion system comprising many solid state rechargeable battery cells, comprises: rolled substrate (12) less than 10 microns in thickness along shortest axis; at least one electrochemical cell comprising positive electrode material, solid state layer of ceramic material configured for conducting lithium ions and negative electrode material configured for electrochemical insertion of ions; and electrically conductive material coupled with positive electrode material and free from contact with negative electrode material.    USE - The vehicle propulsion system is useful to power a drive train (claimed).    ADVANTAGE - The vehicle propulsion system: produces an improved solid state battery for large scale production; utilizes battery cells which free from solid electrolyte interface/interphase layers, are capable of achieving at least 5000 cycles while being cycled at 80% of the rated capacity.    DETAILED DESCRIPTION - Vehicle propulsion system comprising many solid state rechargeable battery cells configured to power a drive train, comprises: a rolled substrate (12) less than 10 microns in thickness along a shortest axis, where the rolled substrate comprises a surface region; at least one electrochemical cell formed overlying the surface of the rolled substrate, the electrochemical cell comprises a positive electrode material comprised of a transition metal oxide or a transition metal phosphate, where the positive electrode material has a thickness of 0.5-50 microns, a solid state layer of a ceramic, polymer, or glassy material configured for conducting lithium or magnesium ions during a charge and discharge process, where the solid state layer has a thickness of 0.1-5 microns and a negative electrode material configured for electrochemical insertion or plating of ions during the charge and discharge process, where the negative electrode material has a thickness of 0.5-50 microns; and an electrically conductive material coupled with the positive electrode material and free from contact with the negative electrode material.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of solid-state battery cell.    Electrochemical cell layers (10)    Substrate (12)    Cathode current collector (16)    Anode current collector (18)    Cathode material (20)