Patent ID: 6828059
Filing Date: 2004-12-07
Classification: H01M,Y02E,Y02P

Abstract:
A method for forming an electrode assembly, comprising the steps of:a) providing an anode electrode comprising an anode current collector having an anode active material contacted thereto; b) providing a cathode electrode comprising a cathode current collector having a cathode active material contacted thereto, wherein at least one of the anode current collector and the cathode current collector has a generally rectangular shape provided by spaced apart first and second ends extending to and meeting with opposed generally straight first and second edges extending continuously along a length of the at least one current collector between the first and second ends, and wherein the at least one current collector is provided with the anode active material or the cathode active material as the case may be contacted to at least one of its major sides and extending substantially from the first edge to the second edge; c) removing the anode active material or the cathode active material from the at least one major side of the at least one current collector in a plurality of predetermined regions extending from the first to the second edges of the current collector; and d) winding the anode electrode and the cathode electrode into a wound cell stack having at least three straight regions with substantially U-shaped bend regions connecting between the straight regions, the bend regions being where the anode active material or the cathode active material has been removed.