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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHiroshi Yasuda, Kazuyoshi Yonezu, Hiroshi Okamoto, Katsuhiro Takahashi
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A battery plate for lead acid storage batteries using a grid prepared by expanding a lead-calcium-tin (Pb--Ca--Sn) alloy sheet, is made by expanding a Pb--Ca--Sn alloy sheet having a tensile strength of 6.0 kg/mm.sup.2 or lower and an Sn content of 0.6-1.8% by weight to make a grid,filling this grid with an active material paste, and then aging the grid to increase the tensile strength of the expanded grid to 7.0 kg/mm.sup.2 or higher. The workability in expanding of the Pb--Ca--Sn alloy sheet can be improved and furthermore, concentration of stress strain on the nodes of the grid can be inhibited and thus, corrosion of the nodes can be inhibited. The aging can provide a battery pate having a high tensile strength and a lead acid storage battery having an excellent charge-discharge cycle life characteristics.
A method of making a battery plate for lead acid storage batteries, which comprises the steps of applying a film of an antimony-containing lead base alloy to the surface of a lead-calcium-tin (Pb--Ca--Sn) alloy sheet having a tensile strength of 6.0 kg/mm.sup.2 or lower and comprising 0.05-0.09% by weight of calcium, 0.6-1.8% by weight of tin and the balance of lead, rolling them together to form an integrated sheet, then expanding the sheet to make a grid, filling this expanded grid with an active material paste, and then aging the grid to increase the tensile strength of the expanded grid to 7.0 kg/mm.sup.2 or higher.
Dependencies are inferred from the claim text.