| 摘要 |
PROBLEM TO BE SOLVED: To enhance the adhesion strength of core material and a porous body so as to suppress the pole plate deformation or the falling-out of the active material at an active material impregnation time and to enhance an efficiency discharge characteristic by forming fine recesses and protrusions of a specific diameter and depth on the surface layer of conductive core material. SOLUTION: Nickel porous bodies 2 contained in a nickel slurry are hooked with fine recesses and protrusions 1 on the core material surface of a bored steel plate 3, so that the contact area of the bored steel plate 3 and the nickel porous bodies 2 is increased. Therefore, substrate strength after sintering is enhanced, and the deformation of an pole plate or the falling-out of active material in respective processes such as active material impregnation, formation, battery group constitution can be suppressed. With respect to 2 to 3μm average particle diameter of the nickel porous bodies 2, when the diameter of the core material surface recesses and protrusions 1 is 0.01μm or less, a pore diameter is too small, and reversely, when the diameter is 10μm or more, the pore diameter is too large so that the nickel powder 2 cannot be efficiently hooked with the core material surface. Therefore, the diameter of the recesses and protrusions is set to be 0.01 to 10μm, and the depth, to be 0.1 to 5μm. |
