NOVELTY - The vehicle propulsion system comprises solid state rechargeable battery cells and a stack of electrochemical cells. The electrochemical cell comprises a rolled substrate, a positive electrode material, a solid state layer, a negative electrode material and an electrically conductive material. Each electrochemical cell is formed overlying a surface of substrate. The electrochemical cell has an overall thickness of less than 50 microns. The substrate has a thickness of less than 10 microns along a shortest axis, and comprises a surface region.    USE - Used as a vehicle propulsion system comprising solid state rechargeable battery cells configured to power an appliance including a vehicle, a smart phone, a cellular phone, a radio or other portable communication device, a laptop computer, a tablet computer, a portable video game system, an MP3 player or other music player, a camera, a camcorder, a remote control car, an unmanned aeroplane, a robot, an underwater vehicle, a satellite, a global positioning system unit, a laser rangefinder, a flashlight, an electric street lighting, and other portable electronic devices (claimed).    ADVANTAGE - The vehicle propulsion system comprising solid state rechargeable battery cell exhibits good performance, high safety and storage capacity and less contact resistance.    DETAILED DESCRIPTION - The vehicle propulsion system comprises solid state rechargeable battery cells and a stack of electrochemical cells. The electrochemical cell comprises a rolled substrate, a positive electrode material, a solid state layer, a negative electrode material and an electrically conductive material. Each electrochemical cell is formed overlying a surface of substrate. The electrochemical cell has an overall thickness of less than 50 microns. The substrate has a thickness of less than 10 microns along a shortest axis, and comprises a surface region. The positive electrode material comprises a transition metal oxide or a transition metal phosphate, and has a thickness of 0.5-50 microns. The solid state layer is made of a ceramic, polymer or glassy material, is configured for conducting lithium or magnesium ions during a charge and discharge process, and has a thickness of 0.1-5 microns. The negative electrode material is configured for electrochemical insertion or plating of ions during the charge and discharge process, and has a thickness of 0.5-50 microns. The electrically conductive material is coupled with the positive electrode material, and is free from contact with the negative electrode material. The substrate is made of a polymer, a metal, a semiconductor, or an insulator. The positive electrode material comprises a positive electrode layer. The negative electrode material comprises a negative electrode layer. The electrically conductive material comprises an electrically conductive layer. The positive and negative electrode materials layers each have a total surface area of greater than 0.5 m. Each of the electrochemical cells is continuously wound or stacked to each other. The layers are wound into a container that has an external surface area of less than 1/100 th of the surface area of the electrochemical cell. An aspect ratio of the uniform cathode material layer is greater than 500000 when dividing a length of the longest axis by a length of the shortest axis. The battery cells have energy densities of less than 50 Watt-hours per square meter of electrochemical cells. The layers are continuously wound or stacked for 30 times. The battery cells: have specific energies of 300 Wh/kg and energy densities of 700 Wh/l, and gravimetric energy densities of 250 Wh/kg; and achieve 5000 cycles while cycling at 80% of the rated capacity. The system further comprises a multicell, rechargeable solid state battery pack that comprises state rechargeable cells. The first portion of the cells is connected in a series relationship. A second portion of cells is connected in a parallel relationship. The rechargeable solid state battery pack further comprises a heat transfer system and electronics controls configured to maintain an operating temperature 60-200 degrees C. The rechargeable cells comprise respective outermost portions. Each of the outermost portions is present in proximity of less than 1 mm from each other. The rechargeable solid state battery pack is insulated by materials that have a thermal resistance with an R-value of 0.4 m2asteriskK/(Wasteriskin). The system comprises capacitors configured in serial or parallel to provide a higher net energy density than the capacitors alone or conventional particulate electrochemical cells without combined with the solid state rechargeable battery cells. The rechargeable solid state battery pack has an energy density of 500 Wh/kg. The solid state rechargeable battery cells are configured in a wound or stacked structure and configured in a format larger than 1 Amp-hour, and have greater than 80% capacity retention after more than 1000 cycles.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a wound solid state battery cell.