JPS6063877A - Manufacture of sealed lead-acid battery - Google Patents

Abstract

PURPOSE:To uniformly and quickly penetrate electrolyte in a plate group and sufficiently perform formation in a container by winding an electrode plate assembled by interposing electrolyte holding material between nonformed cathode and anode plates with electolyte soluble thin paper with air room existed the accommodating it into a container and pouring electrolyte in the container, then performing formation in the container. CONSTITUTION:Nonformed cathode plate 1 and anode plate 2 are mutually conbimed by sandwiching an electrolyte holding plate 3 between them to form a plate group. The electrolyte holding plate 3 is formed with, for example, glass fine fibers in a mat shape. The plate group is wound with a thin paper 4. The thin paper consists of two layers of 100% pulp paper and air rooms 5 locally exist in paper. The plate group wound by the thin paper 4 is accommodated into the container 6 and electrolyte is poured so that free electrolyte does not exist, then formation is performed in the container. By this process, air is not included in the container and formation in the container is sufficiently performed.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a sealed lead-acid battery.

Conventionally, sealed lead-acid batteries have been produced by chemically forming paste-type electrode plates obtained according to the conventional method 1 in dilute sulfuric acid with a specific gravity of 1.080, washing with water, drying, and assembling the chemically formed electrode plates with an electrolyte holder.
The method used is to inject one electrolyte after the battery is assembled. but.

This method has problems in that it is expensive and it takes a very long time to inject the electrolyte.

Meanwhile, a similar battery was assembled using unformed electrode plates.

There is a method of chemically forming the battery by injecting an electrolytic solution of a predetermined specific gravity that will finally give the appropriate specific gravity, that is, a battery cell forming method. This method of forming a battery can reduce the charging time and manufacturing process compared to the above-mentioned method, but unless the injection time of the electrolyte is very long, it will not penetrate uniformly into the pores in the electrode plate group, resulting in extreme If so,
There was a drawback that an air pocket was formed in the center of the yang where the electrolyte did not permeate, and the cell formation did not progress sufficiently. It was discovered that this air pocket is formed because the electrolyte permeates from the periphery toward the center of the electrolyte holder during injection of the electrolyte. .

The present invention provides manufacturing method 1 for carrying out the above-mentioned battery container formation,
The purpose is to prevent the formation of an air pocket in the center of the electrode plate where the electrolyte does not permeate, and to allow battery cell formation to proceed sufficiently.

In order to achieve the above object, the present invention provides an electrode plate group assembled with an electrolyte holder interposed between unformed anode and cathode plates.
The device is characterized in that it is wound up with electrolyte-soluble thin paper dotted with air chambers and stored in a battery case, and then an electrolyte is injected to form the battery case.

The present invention will be explained below from Example 1.

An electrode plate group is assembled by alternately combining unformed anode plates and 1% interpolation plates with an electrolyte holder 3 interposed between them. The electrolytic solution holder 3 is formed into a cloak shape and is made of fine glass fibers as a main component. This electrode plate group is wrapped with thin paper 4.

The thin paper 4 is made of 100% pulp paper with two layers and has a thickness of 0.3 mm+. There are also 5 air chambers with a diameter of approximately 5 mm. The dot density of air chambers 5 is 1 per 57
There are 0 pieces.

The electrode plate group wound with the thin paper 4 was placed in a battery container 61, and an electrolytic solution (dilute sulfuric acid) having a specific gravity of 1.260 was injected and impregnated to the extent that nothing was released from the electrode plate group. The electrolyte was colored with methyl orange or the like, and the state of the anode or cathode plate 15 minutes after injection is shown in FIG. (a) shows the state of a conventional electrode plate that is not wrapped with thin paper, and air pockets 7 are present. This air pocket 7 remained even after 30 minutes of injection. On the other hand, in the present invention, as shown in (b), 15 minutes after the electrolyte is injected, the electrolyte is applied to the entire surface of the electrode plate. It penetrated and no air pockets were observed. This is because the thin paper dotted with air chambers slows down the penetration of the electrolyte into the surrounding area holding the 1αα liquid.

This is thought to be to prevent the electrolyte from rapidly penetrating from the peripheral portion of the electrolyte holder, closing off the central portion, and forming an air pocket.

After forming the battery case, a 5HR discharge test at 25° C. was conducted as an initial performance test, and the battery according to the present invention had a battery life of 5 hours IO minutes, while the conventional battery without tissue paper had a battery life of 4 hours 40 minutes. The reason why the battery according to the present invention has excellent discharge performance is that no air pockets are formed and the battery cell formation is sufficiently performed. In addition, since the tissue paper is 100% pulp, it dissolves in the electrolyte and becomes a paste, forming a layer around the electrode plate group.
This will be filled. By doing this, there is no free electrolyte,
The amount of electrolyte, which is originally limited, can be increased by about 5% compared to the conventional method, contributing to improved discharge performance.

As described above, the present invention enables the injected electrolyte to uniformly permeate throughout the electrode plate group in a short period of time in the manufacture of sealed lead-acid batteries that undergo five-cell formation, thereby allowing the cell formation to proceed sufficiently. It is possible to increase the amount of electrolyte, which is originally limited, and to improve battery performance by increasing the amount of electrolyte, which is of great industrial value.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional explanatory diagram showing a state in which a group of electrode plates wrapped with thin paper is housed in a battery case in the present invention, and FIG. 2 is an explanatory diagram showing the state of penetration of electrolyte into the electrode plates in the conventional and present invention. It is a diagram. 1 is an anode plate, 2 is a cathode plate, and 3 is an electrolyte holder. 4 is tissue paper, 5 is an air chamber, 6 is a battery container, 7 is an air reservoir Patent Applicant Figure 1

Claims (1)

[Claims] A group of electrode plates assembled with an electrolyte holder interposed between unformed anode and cathode plates is wrapped with electrolyte-soluble thin paper dotted with air chambers, placed in a battery case, and electrolyte is injected to generate electricity. A method for producing a sealed lead-acid battery characterized by tank chemical formation.