Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Reexamination Certificate
1998-05-11
2001-05-15
Chaney, Carol (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
C429S225000
Reexamination Certificate
active
06232018
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to an electrode plate for a lead acid accumulator and its producing method.
BACKGROUND OF THE INVENTION
In Chinese Patent Application CN 1051273A, entitled “plate shaped acid positive electrode”, issued on May 8, 1991, an electrode plate is disclosed, which consists of two overlain electrically conducting plates with the same structure. The peripheries of the adjacent faces of two electrically conducting plates are provided with a main rib and each of electrically conducting plates is provided with substantially equal quantity of liquid incoming apertures. Meanwhile, the adjacent faces of two electrically conducting plates are coated with lead powder. In order to prolong the lifetime of electrode plate, the binding strength of the lead powder coating to the electrode plate is enhanced by providing crimping edge around peripheries of the adjacent faces, or arranging reinforce ribs on the adjacent faces of electrically conducting plates. This patent has raised the lifetime of the electrode plate at certain level. However, from the point of view of overall behavior of the accumulator, the over thickness of the electrode plate leads to the reduction of specific energy.
Another Chinese patent application CN 2073171U, entitled “lead acid accumulator having high specific energy and long lifetime”, issued on Mar. 13, 1991, proposes a technical solution to reduce the thickness of an electrode plate in an accumulator, the way of which is to thin the plate grid of positive electrode plate to 4.0-7.5 mm. At the same time, the plate grid of a negative electrode plate is also to be thinned correspondingly, so that in a same container of the lead acid accumulator the number of electrode plates is increased relatively (i.e. the surface area is increased), and the polarization current for charging and discharging is reduced. Therefore, the specific energy is increased under the precondition that the lifetime is not damaged. However, the increase of specific energy by means of increasment of the surface area by thinning the electrode plate, generally speaking, will undoubtedly damage the lifetime and the strength of the electrode plates. Such disadvantage is just a problem difficult to be solved for several years in the accumulator field.
The technical solutions disclosed in the above mentioned two patents can not radically overcome the contradiction between the lifetime and the specific energy of an accumulator. Meanwhile, the recycling rate of cadmium is low, and the production cost is high.
Accordingly, the object of the present invention is to provide an electrode plate having high specific energy, high power, long lifetime, resistance to overdischarge and rapid charging, as well as its producing method.
SUMMARY OF THE INVENTION
The invention provides an electrode plate for lead acid accumulator comprising: an activated base, including lead fibre and cadmium-containing lead alloy fibre which are mixed and interwoven homogeneously; said lead fibre accounting for 60-90 wt % of said base, and the surface of said lead fibre being plated with cadmium accountihg for 1-5 wt % of the total weight of said lead fibre;
a plate grid for collecting current and conducting electricity in combination with said activated base; and
a lug, used in the electrically connection between the electrode plates and electrically fixed on said plate grid.
The invention also provides a method for producing the electrode plate, comprising following steps:
by means of cutting, melting pressing or melting blowing process, the lead fibre and lead alloy fibre are produced from lead and cadmium-containing lead alloy;
these fibers are cut into sections;
these sections of lead fibre and lead alloy fibre are put into a sticky solution; by means of stirring, a mixture which is mixed and interwoven homogeneously in three dimension is formed;
said solution is pressed out of said mixture to form a blank block;
the blank block is compressed;
a plate grid is formed on the blank block by means of melting pressing process; and
a lug is connected to said plate grid.
The electrode plate for a lead acid accumulator according to the invention will be described in detail with reference to the appended drawings.
REFERENCES:
patent: 3702019 (1972-11-01), Pollack
patent: 5139902 (1992-08-01), Drews et al.
patent: 2331159 (1977-07-01), None
Baotou Science & Technology Service Corporation
Chaney Carol
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