Abstract: Improvements are disclosed for electrochemical cells of the type comprising at least two bipolar electrodes, with a space occurring between adjacent electrodes which contains a liquid electrolyte. Improvement include forming improved plates for the electrodes from a thermoplastic polymer containing carbon black, wherein the electrodes are formed by dissolving the polymer in a suitable solvent, mixing carbon black with the solvent solution of the polymer, evaporating the solvent from the polymer solution containing the dispersed carbon black, pulverizing the resultant mixture of polymer and carbon black to form a powder, and pressing the powder at an elevated temperature into the improved plates. There is further disclosed, improvements in the formation of electrochemically active material on the plates of the bipolar electrodes, as well as improved separators for positioning between the bipolar electrodes and improved means for sealing the spaces between bipolar electrodes.