Patent ID: 6686087
Filing Date: 2004-02-03
Classification: H01M,Y02E,Y02P

Abstract:
A non-aqueous electrolyte secondary cell with a spirally wound electrode unit, comprising:a) a cell casing; b) a center pin; and c) a strip-shaped cathode layer, a strip-shaped anode layer and a separator layer between the cathode layer and the anode layer, wherein, the layers are spirally wound around the center pin and an axis parallel to their width, and enclosed in the cell casing, a pre-set clearance is provided between the spirally wound electrode unit and the cell casing, such that (B+C)2A is at least 0.954 and at most 0.988, A being the inner diameter of the cell casing, B being the maximum outer diameter of the electrode unit and C being the minimum outer diameter of the electrode unit, and the amount of deformation caused by clamping the spirally coiled electrode within two flat plates and applying a load directly proportional to the cathode width of 1 kgf per each cm of cathode width, wherein the load is applied in the direction of the winding axis of the electrode unit, is at most 8%.