Alloy for thin positive grid for lead acid batteries and method for manufacture of grid
AssigneeRSR Technologies, Inc.
InventorR. David Prengaman
Life of this patent
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Abstract
A lead acid battery grid made from a lead based alloy containing calcium, tin, and silver having the following composition: calcium above 0.06 and below 0.082%, tin above 1.0% and below 1.2%, silver between 0.005 and 0.020%, and optionally containing up to 0.025% aluminum. To enhance corrosion resistance and reduce grid growth, the grid optimally may contain 0.005 to 0.05% copper as an alloying element complementary to and as a replacement for part of the silver, provided the silver content does not fall below 0.005% and no more than a trace of aluminum is present.
Claims16
A cast battery grid comprising a cast alloy containing greater than 0.60 weight % to less than 0.082 weight % calcium distributed relatively uniformly throughout the grain boundaries and the bulk alloy, greater than 1.0% weight % to less than 1.2 weight % tin and 0.005 weight % to 0.020 weight % silver.
A cast lead acid battery grid comprising an alloy containing greater than 0.060 weight % to less than 0.082 weight % calcium, greater than 1.0% weight % to less than 1.2 weight % tin and 0.005 weight % to 0.020 weight % silver.
Dependencies are inferred from the claim text.