Patent ID: 7875379
Filing Date: 2011-01-25
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. An electrochemical cell, which comprises: a) a first electrode comprising a first active material contacted to a first current collector, wherein an uncovered portion of the first current collector is left un-contacted by the first active material and at least a minor portion of the uncovered first current collector portion is provided with a plurality of perforations; b) a terminal pin electrically connected to the first current collector at the uncovered portion; c) a second, counter electrode comprising a second active material contacted to a second current collector; d) a separator segregating the first electrode from direct contact with the second electrode and comprising a continuous sheet folded back upon itself along a crease to provide the separator having an upper separator portion overlaying a lower separator portion, the upper and lower separator portions having a length extending from the crease to an opposite end, wherein the first electrode is disposed between the upper separator portion at least partially secured to the lower separator portion along at least a portion of an aligned peripheral edge of the upper and lower separator portions and through the plurality of perforations of the first current collector at an intermediate location along the folded separator length between and parallel to the crease and the opposite end thereof, thereby forming a first envelope portion housing the first electrode including the terminal pin and a second envelope portion housing the second electrode, the second envelope portion extending from where the upper and lower separator portions contact each other through the plurality of perforations to the opposite end of the folded separator, and wherein an extending portion of the terminal pin extends out beyond the separator to interrupt the peripheral edge thereof; e) a casing housing the first and second electrodes in an aligned and overlaying relationship, wherein the terminal pin is electrically insulated from the casing connected to the second electrode as its terminal; and f) an electrolyte activating the first and second electrodes housed in the casing.