NOVELTY - A spiral wound thermal battery (10) comprises a first conductive layer (20) containing an anode material separated from a second conductive layer (40) containing a cathode material by a separator layer (30) containing a separator material; and a flexible pyrotechnic heat source, where the first conductive layer, the separator layer, and the second conductive layer are rolled together to form a spiral wound configuration.    USE - A spiral wound thermal battery used for defense and commercial applications including fusing applications, down-hole applications, and high-spin applications.    ADVANTAGE - The spiral wound thermal battery is inexpensive, and has high volume.    DETAILED DESCRIPTION - A spiral wound thermal battery comprises a first conductive layer containing an anode material separated from a second conductive layer containing a cathode material by a separator layer containing a separator material; and a flexible pyrotechnic heat source, where the first conductive layer, the separator layer, and the second conductive layer are rolled together to form a spiral wound configuration. The separator material comprises an electrolyte. The electrolyte is a nonconductive solid at ambient temperatures; and it is molten at operating temperatures of the thermal battery, where the operating temperatures include 350-600 degrees C. An outermost layer of the spiral wound configuration is the first conductive layer or the second conductive layer. The first conductive layer has a thickness of 0.001-0.02 inches. The second conductive layer has a thickness of 0.001-0.02 inches. The separator layer has a thickness of 0.001-0.02. An INDEPENDENT CLAIM is included for manufacturing the spiral wound thermal battery, comprising:    (A) preparing a first slurry comprising an anode material, a first polymeric binder, and a first volatile solvent;    (B) depositing the anode material from the first slurry on a first conductive substrate to form a first conductive layer;    (C) preparing a second slurry comprising a cathode material, a second polymeric binder, and a second volatile solvent;    (D) depositing the cathode material from the second slurry on a second conductive substrate to form a second conductive layer;    (E) preparing a third slurry comprising an electrolyte/separator material, a third polymeric binder, and a third volatile solvent;    (F) depositing the electrolyte/separator material from the third slurry on a third conductive substrate to form a separator layer;    (G) stacking the first conductive layer, the separator layer, and the second conductive layer such that the separator layer separates the first conductive layer and the second conductive layer; and    (H) winding the first conductive layer, the separator layer, and the second conductive layer together into a spiral wound configuration.    DESCRIPTION OF DRAWING(S) - The drawing is a cross-sectional view of the A spiral wound thermal battery.    Spiral wound thermal battery (10)    First conductive layer (20)    Separator layer (30)    Second conductive layer (40)