Electrode grid for lead batteries

Details Electrode grid for lead batteries Electrode grid for lead batteries

1998-08-12

2001-05-08

Chaney, Carol (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

C429S241000

Reexamination Certificate

active

06228537

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention pertains to an electrode grid for lead batteries with a rectangular grid frame, pasting accessory rails arranged on it, and a group of grid cross members forming the skeleton to hold the active mass.
2. Description of the Related Art
A large number of electrode grids are known for the production of lead-acid batteries which are supposed to satisfy different, sometimes conflicting requirements. For example, it is demanded of electrode grids that they display a low weight, a low internal resistance, easy fabrication, combined with good shape stability with simultaneously good holding capacity for the active mass. Lead-acid batteries used in motor vehicles must have a high specific capacity relative to both volume and weight and display good current output. Since the electrode grids produced by casting procedures display deviations in their thickness related to the fabrication process, which result in difficulties in pasting-in the active mass and greater installation spacing, U.S. Pat. No. 3,249,981 has already proposed that pasting accessory rails be provided on the grid frame which are subsequently calibrated to a uniform grid thickness. However, the weight of the grid is further increased by this approach.
SUMMARY OF THE INVENTION
The invention has the objective of devising an electrode grid which conforms to the requirements mentioned above, especially as regards minimizing the weight. According to the invention, the problem is solved by an electrode grid for lead batteries, the electrode grid comprising a rectangular grid frame, a plurality of pasting accessory rails arranged on the grid frame, and a plurality of grid cross members forming a skeleton to hold an active mass, wherein the pasting accessory rails extend on both sides of the grid frame solely in the pasting direction.
It was found that pasting accessory rails for the production of uniformly pasted electrode grids are sufficient solely in the pasting direction. The electrode plates produced from them display no impairment of their properties compared to conventional electrode plates although less lead is used in casting electrode grids of comparable size. For the conventional grid thicknesses of 1.1, 1.3, 1.5, 1.7, and 1.9 mm, this means that the corresponding grid thickness is not related to a change in the thickness of the grid frame, but only the height of the pasting accessory rails which is selected accordingly. At a grid thickness of 1.7 mm, this achieves a weight reduction of, for example, about 10%. In addition, the electrode grid configuration according to the invention improves the pastability of the electrode grid.


REFERENCES:
patent: 345511 (1886-07-01), Khotinsky
patent: 3249981 (1966-05-01), Sabatino
patent: 3710430 (1973-01-01), Long et al.
patent: 5093970 (1992-03-01), Senoo et al.
patent: 5223354 (1993-06-01), Senoo et al.

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