Abstract: A high-temperature bipolar battery consisting of a plurality of stacked individual cells. A first, thermal-sprayed electrode or electrolyte resistant material ceramic layer is sprayed to the exterior of the face-to-face stacked array and onto the peripheral faces of the battery metal end plates remote from the individual cells of a thickness sufficient to virtually eliminate all through pores therein. A second thermal-sprayed ceramic layer is of a thickness sufficient to form a metal support and containment structure of the bipolar battery stack. The thermal-sprayed layers have similar coefficients of thermal expansion (CTE). A metal cup surrounds and encloses at least one of the electrodes of each individual cell tending to form an inter-cell seal between the thermal-sprayed ceramic layer and the metal cup to prevent communication of electrolyte from cell to cell.

Abstract: Thermal batteries comprise an anode of alkali or alkaline earth metal and a fluorocarbon polymer of fluorochlorocarbon polymer depolarizer.

Abstract: Ferric sulfate is added to the iron pyrite depolarizer of a thermal battery to provide a predetermined voltage transient on activation of the battery.