| 摘要 |
PURPOSE:To obtain a cathode plate in which self discharge and decrease in electrolyte are retarded and overdischarge performance is good by using a grid made of lead-tin-calcium-bismuth alloy in which the content of tin is 0.05-3.0 wt.%, that of calcium is 0.01-0.04 wt.%, and that of bismuth is 0.001-0.1 wt.% as a cathode plate. CONSTITUTION:A battery consists of a cathode plate having a grid made of lead-calcium-tin-bismuth alloy in which the content of tin is 0.05-3.0 wt.%, that of calcium is 0.01-0.04 wt.%, and that of bismuth is 0.001-0.1 wt.%, an anode plate, and a separator. In the battery using this grid for the cathode plate, even when the battery is overcharged, no passive layer is formed on the inter face between the grid and active material, and no electrolyte is decreased. Therefore, deterioration in capacity is prevented. The grid for cathode plate in which overcharge performance is increased without sacrifice of other perfor mance, mechanical strength is increased, and casting ability is increased can be obtained.
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