Title: Method of making battery plate grids for lead-acid batteries and alloys therefor

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Claims: We claim:

1. An alloy for use in the manufacture of battery plate grids for lead-acid batteries, wherein the alloy consists of:

    Calcium + Lithium 0.22  - 1.04
    Aluminium         0.035 - 0.25
    Lead              remainder,

and wherein the atomic percentage of lithium is not less than 0.15 and does not exceed 0.90, and the atomic percentage of calcium is not less than 0.07 and does not exceed 0.49.

2. An alloy for use in the manufacture of battery plate grids for lead-acid batteries, wherein the alloy consists of:

    Calcium + Lithium 0.22 -1.04 Atomic %
    Aluminium         0.035-0.25 Atomic% and
    Lead              Remainder,

and wherein the atomic percentage of lithium in the alloy is not less than 0.18 and does not exceed 0.58 and the atomic percentage of calcium in the alloy is not less than 0.07.

3. An alloy for use in the manufacture of battery plate grids for lead-acid batteries wherein the alloy consists of:

    Calcium + Lithium 0.25 -0.65 Atomic %
    Aluminium         0.035-0.25 Atomic % and
    Lead              Remainder,

and wherein the atomic percentage of Lithium in the alloy is not less than 0.23 and does not exceed 0.43 and the atomic percentage of Calcium in the alloy is not less than 0.07.

4. An alloy for use in the manufacture of battery plate grids for lead-acid batteries, wherein the alloy consists of:

    Calcium + Lithium 0.30 -0.50 Atomic %,
    Aluminium         0.035-0.25 Atomic % and
    Lead              Remainder

and wherein the atomic percentage of Lithium in the alloy is not less than 0.28 and does not exceed 0.39 and the atomic percentage of Calcium in the alloy is not less than 0.07.

5. A method of manufacturing a battery plate grid for a lead-acid battery comprising the steps of producing a molten alloy consisting of:

    Calcium + Lithium 0.35-0.50 Atomic %
    Aluminium         0.11 Atomic % and
    Lead              Remainder,

and wherein the atomic percentage of Lithium is not less than 0.15 and does not exceed 0.90 and the atomic percentage of Calcium is not less than 0.07 and does not exceed 0.49, and then casting the molten alloy into the shape of the grid.

6. A method as claimed in claim 5 wherein the casting operation is carried out in air.

7. A method as claimed in claim 5 wherein the alloy is cast in a mould to produce the required grid and the region of the mould presented to the alloy is maintained at a temperature between 150.degree.C and 250.degree.C.
Other info:

Inventors: Barnes, Stanley Charles (Coventry, EN)
Lawrie, Robert James (Solihull, EN)

Application Number: 453976
Filing Date: 1974-03-22
Publication_date: 1976-02-17
Assignee: Joseph Lucas (Batteries) Limited (Birmingham, EN)
Primary Class(es): 164/122 420/564
Other Classes:
US Patent Ref:

1745721	Feb, 1930	Shoemaker	75/167.
1791148	Feb, 1931	Shoemaker	75/167.
3647545	Mar, 1972	Mao	75/167.

Other Refs:
Primary Examiner: Dean, R.
Assistant Examiner:
Attorney: Holman & Stern