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.
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.
SAKO HIROFUMI
SATO HIROSHI
SAI HIROSHI
