JPS58111277A - Sealed lead storage battery - Google Patents

Abstract

PURPOSE:To prevent any reduction in the amount of electrolyte by adding a pulverized catalyst powder, on which a noble metal is supported, into a retainer used for supporting the electrolyte, and directly converting oxygen and hydrogen generated during charging into water by catalysis. CONSTITUTION:A catalyst made of pulverized gamma-alumina or zeolite powder on which a noble metal such as palladium is supported, is added into a retainer 1 used for supporting electrolyte. After that, a lead storege battery is constituted by combining the retainer 1 with both a positive and a negative plate 2 and 3. Thus, by making palladium to the supported on the carrier, any generation of a local battery which might be caused due to the migration of palladium in the electrolyte is prevented, and the solubility of palladium in sulfuric acid is decreased by using gamma-alumina or zeolite as the carrier. As a result, oxygen and hydrogen generated during charging can be directly converted into water effectively by catalysis, and any reduction in the amount of the electrolyte can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to prevention of electrolyte reduction in a sealed battery.

In the conventional 11m+5 type ship storage battery, the negative electrode plate has the ability to absorb oxygen scum generated during charging. However, if the charging current is too high, the limit of this oxygen miss absorption ability may be exceeded. Therefore.

Sealed small lead-acid batteries are suitable for rapid charging and are said to be TL. Furthermore, sealed small lead-acid batteries are characterized by no leakage, and the amount of electrolyte in the battery is naturally limited. Therefore, if the electrolyte decreases due to rapid charging,
The bond between the electrode plate and a non-woven fabric such as glass fiber called a retainer (for the purpose of retaining the electrolyte) deteriorates, leading to an increase in internal resistance and a rapid decrease in capacity.

The purpose of the present invention is to add fine powder such as r-alumina supporting a noble metal such as palladium into the retainer of a sealed lead-acid battery, and to convert oxygen and hydrogen generated during charging directly into water through catalytic action. This is to prevent the amount of electrolyte from decreasing. - Next, embodiments of the present invention will be described.

Palladium of 20 A' or more is supported on r-alumina or zeolite, which is larger than the gap between the fibers, using an ordinary catalyst preparation method. This catalyst was added to the retainer for 1 tC as shown in Figure 1.

Assemble the battery. The reason why palladium is supported on a carrier is to prevent the formation of local batteries due to movement of palladium in an electrolytic solution. Also.

The supports, r-alumina and zeolite, have little solubility in sulfuric acid, and even if they are eluted, Ag remains.

CIt, Na ions have no effect on the battery.

Note that 2 is a positive electrode plate, 3 is a negative electrode plate, and 4 is a catalyst.

Figure 2 shows the state of decrease in electrolyte with t1 of a battery without the addition of a conventional catalyst and the life test amount of the added current.
In the case of aIA current cut and constant voltage input, there is almost no effect of catalyst addition, and in the case of 3A current cut and voltage charging B, the difference is significant. Here, (even when charging with a 115A current cut, is there a significant decrease in electrolyte?

This is due to water evaporation.

fEtdC indicates 8A current cut constant voltage charging when catalyst is added, and a15A current cut constant voltage charging when catalyst is added.

Figure 3 shows the capacity change in the life test with constant voltage charging with a current cut of 3A, and shows the effect of catalyst addition on the capacity reduction in the cycle life test.As a matter of course, the battery with catalyst added has less electrolyte. Capacity decrease and capacity variation will be reduced. The beak is a conventional battery.

As mentioned above, the present invention has great industrial value, as it can prevent rapid deterioration of battery capacity even when rapid charging is performed.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a group of electrode plates to which a catalyst is added. Figure 2 is a curve diagram showing the amount of electrolyte bound during the life test;
The figure is a curve diagram showing a change in capacity in a life test using 3A current cut constant voltage charging. Patent applicant file 2, :::I-1/Y

Claims (1)

[Claims] A Ws-type ship storage battery characterized by adding catalyst fine powder supporting a precious metal to the battery.