Energy storage device

An energy storage device comprising:

• a container comprising a first inner surface and a second inner surface disposed opposite the first inner surface;
• a mandrel comprising a first mandrel surface and a second mandrel surface, the mandrel positioned within the container such that the first mandrel surface is spaced apart from the first inner surface to define a first cell cavity within the container and the second mandrel surface is spaced apart from the second inner surface to define a second cell cavity within the container;
• at least one sheet of separator material;
• a first plurality of discrete electrodes;
• and
• a second plurality of discrete electrodes;
• wherein:
• the container has a packing axis that passes through the first cell cavity, the mandrel, and the second cell cavity,
• the mandrel is compressible in the direction of the packing axis,
• a first sheet of separator material of the at least one sheet of separator material is arranged in the first cell cavity wholly to provide a first plurality of separator layers along the packing axis,
• a second sheet of separator material of the at least one sheet of separator material is arranged in the second cell cavity wholly to provide a second plurality of separator layers along the packing axis,
• the first plurality of discrete electrodes comprises a first plurality of discrete positive electrodes and a first plurality of discrete negative electrodes,
• the second plurality of discrete electrodes comprises a second plurality of discrete positive electrodes and a second plurality of discrete negative electrodes,
• the first plurality of discrete electrodes is distributedly disposed along the packing axis and wholly within the first cavity,
• the second plurality of discrete electrodes is distributedly disposed along the packing axis and wholly within the second cavity,
• the first plurality of discrete electrodes occupies space between adjacent separator layers of the first plurality of separator layers, and
• the second plurality of discrete electrodes occupies space between adjacent separator layers of the second plurality of separator layers.