Abstract: A cell package is made of a laminate which can be heat sealed even when the cell package is contaminated with electrolyte. The laminate includes a polyester outer layer, an aluminum barrier layer and a polypropylene inner layer which are adhered together by an adhesive which does not break down in the presence of electrolyte.

Abstract: A method of manufacturing an electrochemical battery where the electrolyte is introduced into the cell stack with minimal or no loss of electrolyte. The method of fabricating the battery, comprises the steps of separately forming an electrode cell stack and a sealed electrolyte pouch, placing the cell stack and the electrolyte pouch together into a cell package, applying a vacuum to the cell package, sealing the cell package, and rupturing the pouch to release the electrolyte into the cell stack. The pouch is ruptured by squeezing the pouch until the electrolyte squirts out of the pouch. Also, the cell package is sealed by heat sealing. With this fabrication technique there is little or no electrolyte loss. In particular, since the electrolyte is injected into the electrode cell stack after the package has been sealed, substantially all of the electrolyte is suctioned into the electrode cell stack without any of the electrolyte escaping from the package.