Patent ID: 7300475

Claim:
A method for manufacturing an electrode apparatus, comprising the steps of: providing an electrode structure including an upper electrode plate; an over-current protection device and a lower electrode plate, wherein the over-current protection device is ring-shaped and in the form of a lamination constituted of an upper metal foil, a current-sensitive layer and a lower metal foil; and treating the electrode structure by in which the electrode structure is hit against a stationary object at a speed above 2 meters per second, so as to form an electrode apparatus, wherein the electrode apparatus has the following characteristics: (a) a resistance is below 0.05 ohm at 25° C.; (b) a deviation of resistances of a plurality of electrode apparatuses is below 0.005 ohm at 25° C.; (c) the R f R i value is less than 0.8, where R f is the resistance after treatment and R i is the initial resistance before treatment; and (d) the σ f /σ i value is less than 0.8, where σ f is the standard deviation after treatment and σ i is the standard deviation before treatment.