Lead-acid battery positive plate and alloy therefore
AssigneeExide Technologies
InventorsXiangjun Wang, David Robert Mihara, Prosper Adanuvor, Edward Mattan
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Abstract
A lead-acid battery grid made from a lead-based alloy containing tin, calcium, bismuth and copper and characterized by enhanced mechanical properties, corrosion resistance, less battery gassing, lower sulfation and water loss, and no post-casting treatment requirements for age hardening. In one embodiment, the battery grids are formed from a lead-based alloy including about 2.0% tin, about 0.0125% copper, about 0.065% calcium, and about 0.032% bismuth. Preferably, the battery grid is free of silver beyond trace levels in the alloy.
Claims16
A lead-acid cell having a positive plate and a negative plate disposed with a container, a separator disposed within said container and separating said positive and negative plates, and an electrolyte within said container, said positive plate comprising a grid supporting structure having a layer of active material thereon, said grid supporting structure comprising a lead-based alloy consisting essentially of lead, from about 1.5% to about 3.0% tin, from about 0% to about 0.02% copper, from about 0.015% to about 0.04% bismuth, and from about 0% to about 0.08% calcium, the percentages being based upon the total weight of said lead-based alloy.
A plate for a battery having a grid comprising a lead-based alloy consisting essentially of lead, about 2.0% tin, 0.0125% copper, 0.032% bismuth, and 0.065% calcium, the percentages being based on the weight.
A plate for a battery having a grid comprising a lead-based alloy consisting essentially of lead, about 2.0% tin, about 0.0125% copper, about 0.015% bismuth, and about 0.065% calcium, the percentages being based on the weight.
Dependencies are inferred from the claim text.