| 摘要 |
PROBLEM TO BE SOLVED: To surely avoid short circuits between positive and negative electrodes caused on a positive electrode burr by facing at least part of the edge part of a negative plate to a separator with the adjoining separator between at a distance in a lamination direction. SOLUTION: Positive plates 2 is obtained by filling slurry, wherein a positive electrode active material composed of powder having a main component of nickel hydroxide and a binder agent are dispersed into a nickel three-dimensional porous body and roll-forming into a given thickness, and cutting into a given shape. Negative electrode plates 3 are formed by applying active material layers 3b, composed of a hydrogen storage alloy, onto the obverse and reverse surfaces of holding base plates 3a composed of a punching metal, and both the end parts of the active layer 3b are formed by thin parts 3c thinner than the center parts. When an electrode body 5 is formed by interposing separators 4 between the negative electrodes 3 and the positive electrodes 2, having a width same as that of the negative electrodes 3, the end parts of the negative electrodes 3 face the separators 4 at a given distance from the adjoining separator 4. Moreover, the differences S1, between the thickness of the center parts of the negative electrode plates 3 and that of the thin parts 3c, and the width S2 of the thin parts 3c is preferably about 140μm or more and about 200μm or more respectively. |
