Patent ID: 7553585
Filing Date: 2009-06-30
Classification: H01M

Abstract:
1. An electrochemical battery cell comprising: a housing with an upstanding side wall; a first electrode comprising a first active material; a second electrode comprising a second active material disposed within the first electrode; a separator disposed between the first and second electrodes; an electrolyte; and a cell longitudinal axis; wherein: at least one of the first and second electrodes comprises a solid body having a surface with a plurality of radially extending lobes, each having a base, a tip and a radial center line, that form a plurality of concave and convex areas in its surface; each concave and convex area in the surface of the solid body has no radius less than 0.76 mm; and each lobe has a width that continually decreases as a distance along its radial center line from its base to its tip increases.