JPS58147959A - Method of judging nature of electrode plate for lead storage battery - Google Patents

Abstract

PURPOSE:To enable the natures of unformed electrode plates seen during the time when they are left to be stably judged securely by coating the opening part of a sample plate in which a paste plate is molded, with a heat-proof acid-proof synthetic resin, and judging the changes in the nature of packed electrode plates according to the folding strength of the paste plate. CONSTITUTION:A sample plate 1, the opening part 2 of which has dimensions of 15X 20mm. at the upper surface, 14X19mm. at the lower surface, and 25mm. thickness, is formed by injection molding in such a manner that the inner wall of the opening part 2 is coated with a polypropylene 5. Since the wall surface of the opening part 2 is made of a synthetic resin as mentioned above, a paste plate packed into the opening part 2 can be easily taken out, the surface of the opening part 2 remains smooth over a long period of time, and the sample plate 1 can be used many times by washing it. As to criteria for judgement of unformed electrode plates carried out during the time when they are left, time when the amount of lead which is carbonated during the above leaving becomes 4% (calculated as lead carbonate) is judged, and the folding strength at that time should be a 250g level which is total of a 50g increase level and a 200g level which is the folding strength measured at the point when the above leaving is started.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for determining the properties of electrode plates for lead-acid batteries.

In general, electrode plates for lead-acid batteries are made by filling a grid made of lead alloy with a paste made by kneading lead oxide and dilute sulfuric acid, immediately partially drying it, and then placing it in high humidity. After being stored for a certain period of time, it is left in the atmosphere until it is assembled into a lead-acid battery. The period of this leaving is determined based on the experience that leaving the battery for a long time shortens the life of the battery, and the cause is thought to be lead carbonation. For this reason, we have a production plan that does not leave the products unused for long periods of time, but many types of unformed electrode plates are often left unused for long periods of time until they are assembled.

For this reason, it is necessary to judge whether or not the left unformed electrode plate can be used, and as a method to solve this problem, a simple and accurate judgment method is provided. In other words, by making a small plate-shaped paste plate and leaving it together with an unformed electrode plate, and measuring the folding strength of the paste plate at appropriate times, the relationship between the amount of lead carbonate in the plate and the folding strength can be used to determine the strength of the plate. This is a method for determining usage. Figure 1 is a plan view of a sample plate l, which is made of metal such as aluminum. This is a cross section as shown in Figure 2, and sample plate 1
By filling the openings 2 with paste, a paste plate 4 having a trapezoidal cross section as shown in FIG. 3 is made.

In this case, the paste is either filled into the openings 2 and the recesses 3 to improve filling performance, or due to various treatments in the manufacturing process, it is difficult to obtain a neat trapezoidal paste plate (the folding strength measured later). It is difficult to obtain a satisfactory sample for the test.This folding test is based on paste plate 4.
This test measures the maximum load when placing both ends on a support stand and pressing the center of the top with a needle.

After examining the reason why a perfectly shaped paste board could not be obtained, it was found that the biggest cause was the adhesion between the paste board 4 and the sample board 1 at the opening 2I. Even if the wall surface of the opening 2 is finished like a mirror (finished), paste plate 4 may be removed immediately due to corrosion caused by various treatments during the manufacturing process or because paste may remain in some places even after cleaning when reusing.
Otherwise, it adheres to the sample plate and is difficult to remove. After considering various materials, it was found that the opening could be covered with heat-resistant and acid-resistant synthetic resin.

An example thereof is shown in FIG. Size + 00X I 0
5. On one side of the sample plate 1 in Figure 1, which is 2.5 mm in diameter, the opening 2 is 15
In the case of 4 x 19 mm and thickness 25 mm (the thickness is shown quadrupled for explanation), it was manufactured by injection molding so that the inner wall of the opening 2 was covered with polypropylene 5. If the wall of the opening 2 is made of synthetic resin, the paste plate filled therein can be easily taken out, the surface will remain smooth for a long time, and the sample plate 1 can be washed many times. Can be used.

FIG. 5 shows the folding strength when the paste plate 4 of the present invention was left together with the unformed electrode plate.

The shaded area 6 in the figure is the value measured using the paste plate of the present invention, and it can be seen that there is little variation.

On the other hand, with the conventional method, there are large variations as shown in the range 7 in the figure, and in addition to this data, there are also data that completely cracked during Zanburi 1. is stable and is convenient for determining unformed electrode plates that have been left unused.The criteria for determination is that the amount of carbonation during storage is 496 (converted to lead carbonate), and the amount of carbonation at this time is Increase in folding strength soy
The level is set at 250f, which is the sum of the folding strength of 200g at the start of leaving the product. Of course, the folding strength differs depending on the type of electrode plate and paste type, so it is best to create a judgment table for each type.

The present invention has great effects, such as being able to stably and reliably determine the properties of unformed electrode plates that are being left as they are.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a sample plate according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A' in FIG. 1, and FIG. FIG. 4 is a sectional view showing a main part of a sample plate in an embodiment of the present invention, and FIG. 5 is a diagram showing the measurement result area of the folding strength of the paste plate. 1 is the sample plate, 2 is the opening, 3 is the fourth part, 4 is the paste plate, 5 is polypropylene, 6 is the data area according to the present invention, 5-7 is the data area according to the conventional method Patent applicant Shin-Kobe Electric Machinery Co., Ltd. - -6 =

Claims (1)

[Claims] A sample plate in the shape of an electrode plate, which has an opening for molding the paste plate and the area around the opening is made of heat-resistant and acid-resistant synthetic resin, is left after going through a process of filling paste with the regular electrode plate, and then left. A method for determining the properties of a lead-acid battery electrode plate, characterized in that a paste plate is extracted from an opening of a sample plate, and a change in the properties of the filled electrode plate while it is left is judged based on the folding strength of the paste plate.