Patent ID: 6643119
Filing Date: 2003-11-04
Classification: H01G,Y02E

Abstract:
An electrode structure for use in a double layer capacitor comprising:a rolled electrode stack comprising: a plurality of electrodes, each of the plurality of electrodes comprising: a current collector foil; a primary coating formed on a portion of each side of the current collector foil, the primary coating including conducting carbon powder and a binder; and a secondary coating formed on each primary coating, the secondary coating including activated carbon powder, a solvent and a binder; wherein a first set of the plurality of electrodes comprises a respective current collector foil having portions without the primary coating formed thereon that extend from an end of the rolled structure and a second set of the plurality of electrodes comprises another respective current collector foil having portions without the primary coating formed thereon that extend from another end of the rolled structure; wherein portions of the current collector foils extending from each end of the rolled electrode stack are smeared together into electrical contact with each other; a respective separator positioned between each of the plurality of electrodes in a stack such that the respective separator is juxtaposed against respective secondary coatings of adjacent ones of the plurality of electrodes, wherein the respective separator electrically insulates the adjacent ones of the plurality of electrodes from each other, wherein the electrode stack is rolled starting at one end of the electrode stack into a cylindrical structure to form the rolled electrode stack.