H - Electricity – 01 – M
Patent
H - Electricity
01
M
319/79
H01M 4/56 (2006.01) H01M 4/16 (2006.01)
Patent
CA 2027872
METHOD FOR PREPARING LEAD-ACID BATTERY PLATES ABSTRACT Lead-acid battery plates are made by preparing alloys of lead with at least one additive metal that can be leached with an acid or an alkali from the alloy leaving a porous permeable lead matrix. The additive metal must be evenly and finely dispersed in the lead. A number of additive metals can be used but the additive metal is preferably magnesium or zinc and magnesium, each in a preferred amount in the range of about 3 to 15% by weight. The lead alloy is prepared by casting, preferably by rapid solidification casting, and subsequently pulverizing the alloy. The resulting lead alloy particles are applied to a conventional lead alloy battery grid by pressing, causing the formation of a coherent plate of grid and alloy. The plate is subsequently leached in an alkali or an acid which causes the substantial removal of additive metal from the alloy leaving a coherent porous permeable layer of substantially lead as active material. The preferred leachant is sulfuric acid. Other leachants require careful removal of all traces from the lead matrix. The plates are used for both the positive and the negative plates. The negative plates are treated with an expander, preferably by vacuum impregnation. The positive and negative plates are assembled into a battery which is filled with electrolyte and charged. The fabrication time is reduced from 5 to 7 days for prior art batteries to about 1 to 2 days.
Cominco Ltd.
Gowling Lafleur Henderson Llp
LandOfFree
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