Patent ID: 6620548
Filing Date: 2003-09-16
Classification: H01M,Y02E,Y02P

Abstract:
A sealed type alkaline storage battery including a cell casing supplied with an amount of alkaline solution and a group of spiral electrodes contained in the cell casing, said group of electrodes being composed of positive and negative electrode plates spirally wound with a separate interposed therebetween in such a manner that the entire surface of the positive electrode plate is opposed to the negative electrode plate through the separator, wherein a discharge capacity ratio of the entirety of the negative electrode plate to the entirety of the positive electrode plate is determined to be more than or equal to 1.9, an area ratio of the negative electrode plate to the positive electrode plate is determined to be more than 1.0 and less than or equal to 1.4, and the thickness of the positive electrode plate is determined to be less than or equal to 0.6 mm, thereby to enhance the absorption property of oxygen gas at the negative electrode plate.