JPS5835869A - Manufacture of small lead storage battery - Google Patents

Abstract

PURPOSE:To make an electrode plate and retainers in close contact with each other, and increase and equalize the capacity of a small lead storage battery by sticking the retainers to the electrode plate at the same time or right after a paste is packed into a grid. CONSTITUTION:Right after a paste is packed into a grid, when the viscosity of the paste still remains on the surface of an electrode plate 1, the plate 1 is passed between rollers 4 and 4' while it is held between retainers 2 and placed on a belt conveyer 3. As a result, the plate 1 and the retainers 2 become in close contact with each other, and the internal resistance of the plate 1 seen when it holds electrolyte can be decreased. Consequently, the variation in the internal resistance of the battery decreases to around 20mOMEGA, the capacity of the battery can be homogeneously increased to from 70 to 80min by discharge time, and the battery capacity variations can be almost disregarded.

Description

[Detailed description of the invention] The present invention applies to a method of manufacturing a small lead-acid battery.

Conventionally, in sealed small lead-acid batteries, the electrolyte is held in a nonwoven fabric such as glass fiber called a retainer. J. If the contact between the electrode plate and the retainer is not tight, the contact area between the electrolyte in the retainer and the electrode plate will decrease, and the internal resistance will increase.

An increase in internal resistance leads to an increase in IR loss during discharge, resulting in a decrease in battery capacity. In order to suppress this increase in internal resistance, a common method that has been considered in the past is to pressurize the electrode plate group. However, this method had the disadvantage that the thickness of the retainer, the thickness of the electrode plate, etc. had to be extremely precisely controlled so that the amount of electrolyte retained did not change after pressurization, and the process logic was difficult. .

The purpose of the present invention is to attach the retainer to the electrode plate at the same time or immediately after filling the grid with paste, thereby increasing the adhesion between the electrode plate and the retainer, thereby increasing the capacity and making the battery capacity uniform. There is a particular thing.

Next, one embodiment of the present invention will be described.

Immediately after filling the grid with paste, when the paste remains sticky on the surface of the electrode plate, as shown in FIG.
4.4'. As a result, the gap between the electrode plate 1 and the retainer 2 is eliminated, and the electrode plate 1 and the retainer 2 are brought into close contact with each other, and the internal resistance can be reduced when the electrolyte is held.

Figure 2 shows the distribution of internal resistance and battery capacity in a conventional sealed small lead-acid battery. The internal resistance ranges over a wide range from 40 mΩ to 150 mΩ, and the battery capacity accordingly varies widely in terms of discharge duration from about 10 minutes to about 60 minutes. However, in the sealed small lead-acid battery according to the present invention, which is manufactured by attaching a retainer to the electrode plate during paste filling, as shown in Figure 3, the internal resistance has little variation (it has dramatically decreased to about 20 mΩ, and the battery capacity has decreased. The discharge duration ranges from 70 minutes to 80 minutes.
It has become possible to uniformly increase battery capacity up to 1 minute, and variations in battery capacity can now be almost ignored.

As described above, the present invention has great advantages in that it can increase battery capacity and make battery capacity uniform.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a state in which an electrode plate immediately after filling with paste is held between a retainer and passed through a sandwich roller in an embodiment of the present invention, and Fig. 2 shows the internal resistance and battery capacity of a conventional sealed small lead-acid battery. Distribution diagram, Figure 3 shows the internal resistance and battery capacity l of the sealed small lead-acid battery obtained by the present invention, the electrode plate, 2#'i retainer, 3 the belt conveyor, 4
．． 4' is roller patent applicant Shin-Kobe Electric Co., Ltd.

Claims (1)

[Claims] A small lead-acid battery characterized by attaching a retainer to the electrode plates at the same time as or immediately after filling the grid with paste.