Methods of the present invention are provided for forming a plurality of
electrochemical cell layers, each cell layer generally including a pair
of electrodes and a separator electrically insulating the pair of
electrodes. Cells of a desired size are formed by slicing the laminar
sheet through both opposing major surfaces. In certain embodiments,
individual cells are defined by fill regions, filled with removable
substances. Thus, when the cells are sliced, individual cells and in
certain embodiments current collectors or conductors are exposed with
minimal or no further processing. In other embodiments, fluid access
channels or porous layers are filled with removable substances. Thus,
when the cells are sliced, structural support is provided for the
intended void regions.