| 摘要 |
PROBLEM TO BE SOLVED: To provide a lead-acid battery having superior high-rate discharge characteristics and high lifetime characteristics in the lead-acid battery that uses expanded grids for the positive electrode. SOLUTION: In the lead-acid battery using the expanded grid formed by expanding a rolled lead alloy sheet into a mesh shape in a positive electrode, the volume of the expanded mesh part of the expanded grid is made 20% or higher of the apparent volume of the expanded mesh part, the height of a plurality of ribs, installed in parallel with the vertical directions on the surface facing the positive plate of a separator, arranged in between the positive plate and a negative plate and made of microporous polyethylene is made 0.6 mm or smaller, and the distance (a) between the ribs adjoining each other is made equal to or smaller than the mesh width dimension (b) of the expanded grid. COPYRIGHT: (C)2006,JPO&NCIPI
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