JP4411806B2 - Method for manufacturing a lead-acid battery plate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing an electrode plate for a lead storage battery .
[0002]
[Prior art]
In lead storage batteries for automobiles and the like, lead storage batteries using a lead-calcium alloy as a grid for a positive electrode plate have been used because of demand for maintenance-free properties. Further, due to the demand for durability at high temperatures, an antimony or tin thin film as described in JP-A-63-148557 is applied to a rolled sheet of lead-calcium alloy and then processed to expand the lattice. Has been proposed.
[0003]
[Problems to be solved by the invention]
However, such an electrode plate for a lead storage battery has a problem that the effect of durability at high temperatures can be exhibited only at 1/4 of the surface of the lattice. In addition, such an electrode plate for a lead storage battery has a problem in that it is difficult to ensure adhesion between a thin film and a master alloy bonded together as in the past and adhesion between the thin film and an active material.
[0004]
The objective of this invention is providing the manufacturing method of the electrode plate for lead acid batteries which can improve durability at high temperature to the whole surface of a grating | lattice.
[0005]
Another object of the present invention is to provide a method for producing an electrode plate for a lead storage battery capable of ensuring the adhesion between the thin film and the mother alloy and the adhesion between the thin film and the active material.
[0006]
[Means for Solving the Problems]
The method for producing an electrode plate for a lead storage battery according to the present invention is obtained by processing at least one fine powder of antimony and tin into a slurry with a pore forming agent and a thickener, and processing a rolled sheet of a lead-calcium alloy The surface of the expanded lattice produced in this manner is covered and coated, and then the surface of the expanded lattice is covered with antimony by heating at a temperature equal to or higher than the decomposition temperature of the pore forming agent to disappear the pore forming agent. And at least one porous layer of tin is provided, and then an active material is filled in an expanded lattice having the porous layer to obtain an electrode plate.
[0007]
According to such a method, it is possible to easily form a porous layer that covers each part of the expanded lattice in the circumferential direction. In the electrode plate for a lead storage battery manufactured by the method of the present invention, since the porous layer covers each part of the expanded lattice in the circumferential direction, the effect of antimony and tin can be exerted on the entire surface of the lattice. Thus, there is no problem of adhesion between the thin film and the mother alloy bonded together. In addition, since the layer covering the surface of the expanded lattice is a porous layer, the adhesion with the expanded lattice and the adhesion with the active material can be improved, and the life characteristics at high temperatures can be improved.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of an electrode plate for a lead storage battery, a manufacturing method thereof, and a lead storage battery according to the present invention will be described with reference to FIG.
[0009]
In the lead storage battery electrode plate 1 of this example, a porous layer 3 of antimony is laminated so as to cover the surface of the expanded lattice 2, and the surface of the expanded lattice 2 having the porous layer 3 is filled with the active material 4. .
[0010]
Next, an example of the manufacturing method of such a lead storage battery electrode plate 1 will be described. A continuum of expanded lattice 2 produced by processing a rolled sheet of lead-calcium alloy was coated with a slurry of antimony fine powder made of a pore-forming agent and a thickening agent. The antimony porous layer 3 is formed on the surface of the expanded lattice 2 by heating at a temperature higher than the decomposition temperature of the pore agent.
[0011]
The expanded lattice 2 having the porous layer 3 is filled with an active material 4, aged and dried to obtain a positive electrode plate 1.
[0012]
Next, an example of the lead storage battery of this example will be described. The above seven positive electrode plates 1 and eight negative electrode plates inserted in a bag separator are combined and welded together, put into a battery case made of polypropylene, injected with sulfuric acid having a specific gravity of 1.225, and initially charged. A cell A was produced.
[0013]
For the fine powder of tin, the positive electrode plate 1 is formed in the same manner, and the seven sheets of the positive electrode plate 1 and the eight negative electrode plates inserted into the bag separator are combined for group welding and put in a battery case made of polypropylene. Then, sulfuric acid having a specific gravity of 1.225 was injected, and initial charging was performed to produce a unit cell B.
[0014]
Further, as a comparative example, an expanded lattice is prepared by bonding a rolled sheet of lead-antimony alloy to the surface of a rolled sheet of lead-calcium alloy, and this expanded lattice is filled with the active material 4 and aged and dried. A positive electrode plate 1 is formed, and seven of the positive electrode plates 1 and eight negative electrode plates inserted into a bag separator are combined and welded together, and put into a battery case made of polypropylene and injected with sulfuric acid having a specific gravity of 1.225. Then, initial charging was performed to produce a unit cell C.
[0015]
JIS load life tests were performed on the single cells A, B, and C produced in this manner, and the life characteristics were examined. The result is shown in FIG. In FIG. 2, the life cycle number of the cell C as a comparative example is shown as 100.
[0016]
As is apparent from FIG. 2, the single cells A and B of the present invention are superior in the life characteristics as compared with the single cell C of the comparative example.
[0017]
【The invention's effect】
In the method for producing an electrode plate for a lead storage battery according to the present invention, at least one fine powder of antimony and tin is slurried with a pore forming agent and a thickener, and a rolled sheet of a lead-calcium alloy is used. Cover the surface of the expanded lattice produced by processing, and then cover the surface of the expanded lattice by heating at a temperature equal to or higher than the decomposition temperature of the pore former to eliminate the pore former. Since at least one porous layer of antimony and tin is provided, it is possible to easily form a porous layer that covers each part of the expanded lattice in the circumferential direction, and to adhere to the expanded lattice and the active material. It is possible to obtain an electrode plate for a lead storage battery that is improved and has improved life characteristics at high temperatures.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a lead storage battery electrode plate according to the present invention.
FIG. 2 is a diagram showing the results of a JIS heavy load life test of a lead storage battery of the present invention and a lead storage battery of a comparative example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lead plate for lead acid battery 2 Expanded lattice 3 Porous layer 4 Active material

Claims (1)

Coating at least one fine powder of antimony and tin with a pore forming agent and a thickening agent in a slurry form covering the surface of an expanded lattice produced by processing a rolled sheet of lead-calcium alloy Then, by heating at a temperature equal to or higher than the decomposition temperature of the pore-forming agent to eliminate the pore-forming agent, at least one porous layer of the antimony and the tin covering the surface of the expanded lattice A method for producing an electrode plate for a lead storage battery, comprising: providing an electrode plate by filling the expanded lattice having the porous layer with an active material;

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