NOVELTY - An all-solid-state laminar electrochemical battery cell comprises a layer of solid polymer electrolyte which is a cationic conductor having a conductivity of at least 10 to the power -4 S/cm at 25 degrees C and comprising a mixture of a base polymer material comprising ionically conductive polymer(s) and having an initial conductivity of at least 1 x 10 to the power -5 S/cm at 25 degrees C when combined with a metal salt.    USE - As an all-solid-state electrochemical cell for a defined capacity battery, leakproof battery, overcharge-tolerant battery, or orientation-tolerant battery.    ADVANTAGE - The electrochemical cells and batteries employ a thermodynamically stable dry polymer electrolyte that can be manufactured using high speed extrusion or deposition techniques. The cells have good ionic conductivity at room temperature and below so that performance is improved. The polymeric electrolyte is strong yet flexible, dry and non-tacky. The batteries have a higher current drain capability, lower resistance, higher energy content, lower self-discharge rate, and a wider operating temperature range than known solid state batteries. The rechargeable batteries have freedom from dendrite formation, higher efficiency, lower internal resistance, greater capacity utilization, higher cycle life, and better reliability and safety than a rechargeable metal ion battery. These batteries are also better able to tolerate overcharge and will not lead to the emission of deleterious species or outgassing. Less lithium in the cell is used so that cost is reduced and energy content is increased.    DETAILED DESCRIPTION - An all-solid-state laminar electrochemical cell for a battery comprises an anode layer (60); a cathode layer (20); an anode current collector attached to the anode; a cathode current collector attached to the cathode; and a solid polymer electrolyte layer (70) between anode and cathode layers. The solid polymer electrolyte which is a cationic conductor having a conductivity of at least 10 to the power -4 S/cm at 25 degrees C comprises a base polymer material, a metal salt, an inorganic filler, and an ionic conducting material. The base polymer material comprises ionically conductive polymer(s) and has an initial conductivity of at least 1 x 10 to the power -5 S/cm at 25 degrees C when combined with the metal salt. The inorganic filler has an average particle size of less than 0.05 microns in diameter and a surface area of at least 100 m2/g. The ionic conducting material has an average particle size of less than 0.1 microns in diameter and an initial ionic conductivity of at least 2 x 10 to the power -3 S/cm at 25 degrees C.    INDEPENDENT CLAIMS are also included for the following:    (A) a method of making an ultra-thin solid polymer electrochemical cell by forming a cathode/polymer electrolyte/anode laminate and optionally winding and shaping the laminate;    (B) a method of making a strong and flexible electrode/electrolyte half-element for a laminar battery;    (C) a method of making a thin bipolar battery; and    (D) a high-speed manufacturing method for producing an ultra-thin laminar battery comprising extruding a uniform layer of lithium solid polymer electrolyte composition into a thin cathode sheet while the cathode sheet roll is drawn at a uniform rate by an uptake reel; and curing the extruded polymer electrolyte composition as the composite is continuously wound by the uptake reel.    DESCRIPTION OF DRAWING(S) - The figure shows the combined cathode, anode, and electrolyte components and a metallized end spray.    Cathode layer (20)    Anode layer (60)    Solid polymer electrolyte layer (70)