| 摘要 |
PURPOSE:To increase the adhesiveness between a grid and an active material by introducing a lead alloy sheet between rollers, which have irregular surfaces formed by making particles with a given hardness to adhere to the surface of a base roll, before the said lead alloy sheet is subjected to expanding work. CONSTITUTION:Before a lead alloy sheet 2 is introduced into a grid-formation expanding device 5, the sheet 2 is introduced between a pair of irregularity-formation rollers 3 so as to form irregularities over the surfaces of the sheet 2. Here, the roller 3 is made by subjecting the surface of an iron-steel roll to sandblasting to make a base, and coating the roll with alumina particles by fusing pulverized alumina powder to the base by plasma-arc welding so as to form irregularities over the surface. By the means mentioned above, highly dense irregularities can be easily provided over the sheet 2. Consequently, the cycle life of a battery can be increased by highly improving the adhesiveness between a grid and an active material by subjecting thus treated sheet 2 to expanding work to make the grid. |
