NICKEL HYDROGEN STORAGE BATTERY AND PROCESS FOR PRODUCING NEGATIVE ELECTRODE THEREOF

摘要

A nickel hydrogen storage battery produced by winding negative electrode (1), the negative electrode (1) composed of a conductive base sheet and, superimposed thereon, a layer of mixture containing a hydrogen occluding alloy, together with a positive electrode containing nickel hydroxide as an active material with a separator interposed therebetween into a scroll electrode group whose outermost periphery consists of the negative electrode (1) and by accommodating the scroll electrode group in a bottomed cylindrical container. In the nickel hydrogen storage battery, the surface roughness, in terms of ten-point average roughness, of mixture layer of the outermost periphery of negative electrode (1) brought into contact with the side internal wall of the bottomed cylindrical container is = 3.5 µm, greater than the surface roughness of other parts of the negative electrode mixture layer. Consequently, without lowering of the design capacity of battery, the reduction of oxygen gas at rapid electric charging can be streamlined.