NOVELTY - An oblong electrochemical double-layer capacitor (100) has two electrodes, each having a longitudinal axis. Each electrode body has a group of fingers extending parallel to the axis. An electrolyte is distributed between the bodies that are interlaminated and are separated by a non-conductive layer. A coiled structure (200) is formed by the bodies about an axis. At least a portion of either group of fingers has a thickness greater than at least one of body thicknesses. Each group forms a tabbed portion (120) that defines an e.g. cavity-forming three dimensional pattern.    USE - Oblong electrochemical double-layer capacitor for providing high-voltage output in a hybrid electric vehicle.    ADVANTAGE - The oblong electrochemical double layer capacitor cell has a modified jelly-roll design that can provide high energy density, efficient packing, and improved thermal management. The thickness of an electrode material and the fingers from the electrode body can be of any thickness. The thickness can be sufficiently low as to provide a high surface area to volume ratio when used in a capacitor. It may have sufficient mechanical strength to prevent, for example, damage, perforation, and/or tearing of the electrode material. It the thickness increases, more effective joining of one or more finger portions to a hardware terminal is allowed. The specific design of an electrode and/or pattern of finger portions can be adjusted based on e.g. material properties and process tolerance factors. This provides for improved process control. The positioning and alignment of fingered portions are also improved. The oblong capacitor cell design can provide a packing efficiency of about 92 percent. The rounded edges of an oblong capacitor cell can provide space, in the form of conduits between the individual capacitor cells. Air flow can also be provided through a stack of multiple individual capacitor cells in a manner similar to a round package. At the same time, significantly improved packing efficiency is provided.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for    (1) method for manufacturing an electrochemical double-layer capacitor;    (2) device comprising electrochemical double-layer capacitors    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the oblong electrochemical double-layer capacitor cell.    Oblong electrochemical double-layer capacitor (100)    Tabbed portion (120)    Cavity (125)    Coiled structure (200)