JPH02148572A - Electrolyte injection into enclosed storage battery - Google Patents

Abstract

PURPOSE:To sharply shorten a required time for injection by reducing pressure in the battery inside in a state of the water contents 5wt.% inside a plate followed by introducing electrolyte. CONSTITUTION:Atmospheric pressure inside a battery jar 3 is reduced through a vacuum pump 12, the electrolyte inside an electrolyte container 9 is injected into the battery jar 3 through a liquid injection valve 10. There is information that regarding the relation between the water contents inside the plates and the gas generation quantity at the time of liquid injection, when the water contents inside the plate of both positive and negative plates reach above 5wt.%, a gas generation quantity extremely decreases. Accordingly, by injecting electrolyte while reducing pressure in the state of above 5wt.% of the water contents inside the plates, electrolyte can speedily be injected into the space inside a battery.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrolyte injection method for sealed lead-N batteries.

Conventional technology and its challenges In recent years, sealed lead-acid batteries have become increasingly smaller and larger in capacity (increased volumetric efficiency), and the ratio of electrode plates and active materials in the battery case has increased, leaving less space for the electrolyte. has almost disappeared. Since the structure is such that the electrolyte soaks into the separator and electrode plates, a chemical reaction begins between the electrode plates and the electrolyte as soon as sulfuric acid is injected, producing carbon dioxide gas.

As a result, the internal pressure increased, and the liquid could not be filled completely, and the pressure had to be reduced again to inject the liquid.To give you 20 examples:
It took more than 5 minutes to inject 0cc of liquid.

Means for Solving the Problems The present invention solves the problems described above by assembling a battery with a water content of 5% by weight or more in the electrode plates, and then reducing the pressure inside the battery and injecting an electrolyte. The aim is to solve the problems associated with sealed lead-acid batteries and to significantly shorten the injection time when injecting electrolyte into storage batteries.

Example An embodiment of the present invention will be described below.

In the present invention, a grid made of a fishing alloy is filled with a paste made by mixing lead oxide powder with dilute sulfuric acid, and a battery is assembled with the water content in the positive and negative electrode plates each being 13.11% by weight. Vacuum injection was performed. In addition, as a comparison example, if the moisture content in the electrode plate is positive, which is a normally used dry electrode plate,
Negative 0.5 N! A battery was assembled using electrode plates of less than % by volume, and electrolyte was injected under reduced pressure.

FIG. 1 is a schematic diagram showing an embodiment of the electrolyte injection method of the present invention.

In the figure, 1 is a battery, 2 is an electrode plate group, 3 is a battery case, and 4 is a liquid injection port. Reference numeral 5 designates a liquid injection jig having a connecting part 6 that tightly fits into the liquid injection port 4, and a hollow part 5' separate from the battery case for storing gas and liquid is formed inside the jig, and the connecting part 6
It is in close contact with the liquid injection port of the battery 1 through a sealing packing 7 made of acid-resistant neoprene rubber fixed to the base of the battery. 8 is an electrolyte supply section having an electrolyte container 9 and a liquid injection valve 10; 11 is a vacuum switching section consisting of a vacuum pump 12 and a vacuum switching valve 14 having an air suction port 13; The portion 11 is fixed to the upper part of the liquid injection jig 5. 15 is a cylinder connected to the electrolyte supply section.

Next, a method of injecting electrolyte using this device will be explained. First, when the liquid injection valve 10 is closed and the vacuum switching valve 14 is opened, the inside of the battery and the jig is maintained at a vacuum of 730n1111g.Next, when the liquid injection valve 10 is opened, the electrolyte in the container 9 passes through the cylinder 15, Injected into the battery. Table 1 shows the amount of gas generated when 20 Occ of electrolyte was injected using this method, the time required for injection, the number of times the pressure reduction operation was performed, and the time required to reach 730 IlnHg.

As shown in Table 1, it can be seen that by using the method according to the present invention, the amount of gas generated is extremely small, and the time required for liquid injection can be significantly shortened. This is because the electrode plates contain a large amount of water, so there is no rapid chemical reaction between the electrode plates and the electrolyte, and the result is (amount of electrolyte injected)/(capacity of battery internal space M).
This is thought to be because the ratio of

Next, the relationship between the amount of water in the electrode plate and the amount of gas generated during injection was investigated, and the results shown in FIG. 2 were obtained.

It can be seen that when the moisture content in the positive and negative electrode plates is 5% by weight or more, the amount of gas generated is extremely reduced.

The results of the vacuum injection test of 200 cc of electrolyte using the method shown in Figure 1 also largely depend on the amount of gas generated, and if the water content in the electrode plate is 5% by weight or more, the time required to inject the electrolyte will significantly increase. was found to be improved.

Effects of the Invention According to the present invention, the injection time can be significantly shortened when injecting the electrolytic solution of the storage battery under reduced pressure.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the electrolyte injection method of the present invention;
FIG. 2 is a diagram showing the relationship between the amount of water in the electrode plate and the amount of gas generated during injection. 1... Battery, 2... Plate group, 3... Battery case, 4...
・Liquid injection port, 5...Liquid injection jig, 5'...Hollow part, 6.
...Connection part, 8... Electrolyte supply part, 9... Electrolyte container, 11... Vacuum switching part, 15... Simple o 1

Claims (1)

[Claims] 1. A method for injecting an electrolyte into a sealed lead-acid battery, which comprises assembling the battery with a moisture content of 5% by weight or more in the electrode plates, and then injecting the electrolyte while reducing the pressure inside the battery.