JPS62103987A - Method of injecting electrolyte into sealed lead battery - Google Patents

Abstract

PURPOSE:To lengthen life, by pouring in more than a prescribed amount of an electrolytic solution to impregnate the solution into a cathode and an anode plates and fibers of glass or the like, and draining the excess of the solution, to put the electrode plates in sure contact with the fibers to suppress the increase in internal resistance. CONSTITUTION:An electrode plate group comprising a cathode plate 1, 2 anode plates 2 and fibers 3 of glass or the like filled between the electrode plates to hold an electrolytic solution and separate the electrode plates from each other is provided. A solution drain hole 6 is provided in the bottom of a battery jar 5. The fibers 3 of glass or the like are filled between the electrode plates so that the fibers are put in sure contact with the entire sides of the electrode plates. While the solution drain hole 6 is closed by a plug, more than a prescribed amount of the electrolytic solution is poured into the battery jar 5 so that the solution is surely impregnated into the electrode plates and the fibers 3. After that, the plug is removed to drain the excess of the electrolytic solution.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for injecting electrolyte into sealed lead-acid batteries.

BACKGROUND OF THE INVENTION Generally, sealed lead batteries employ a cathode gas absorption method in which oxygen gas generated at an anode is absorbed by a cathode plate. Therefore, the structure is such that the electrolyte is only impregnated into the anode plate, the cathode plate, and a nonwoven or woven fabric such as glass fiber called a retainer, and no free electrolyte exists.

The conventional general electrolyte injection method is as follows:
The sealed lead battery uses a cathode gas absorption method, which limits the amount of liquid. The structure has no free electrolyte. Therefore, the weight and dimensions of the active materials of the anode and cathode plates and the retainer that impregnate and retain the electrolytic solution are strictly controlled to ensure a constant amount of the electrolyte.

However, with the current paste filling method, it is difficult to uniformly fill the filling amount, and the amount of electrolyte that can be contained in each cell varies slightly, so when a fixed amount of electrolyte is injected, , the optimum liquid volume may not necessarily be achieved.

Oxygen generated from the sealed lead battery (sealed lead battery, anode plate force) is absorbed by the cathode plate and water returns, so there is no liquid reduction, but at the end of the photodischarge cycle or during floating charging, the gas absorption at the cathode plate is 1.
Oxygen gas is released. At this time, water vapor is also released at the same time, and liquid reduction progresses during use. When the amount of liquid reduction increases, the contact resistance between the electrode plate and the retainer increases extremely, the internal resistance of the battery increases, and the capacity decreases.

This phenomenon has the disadvantage that if an appropriate amount of electrolyte is not initially injected, it will be accelerated, leading to initial capacity variations at n% extreme levels.

FIG. 2 schematically shows the configuration of the electrode plate group of a conventional sealed lead-acid battery.A separator 4, which is a retainer, is wrapped around the anode plate 1 in a U-shape, and a cathode plate 2 is placed on the outside of the separator 4. ! /It is a structure arranged. The distribution of electrolyte in this electrode plate group has a capacity of 1.8
Taking the Ah (10yqw) battery as an example, the 0
The maximum amount of electrolyte that this electrode plate group can contain is 17.5-. When liquid reduction occurs, it is clear from Figure 3 that the cathode plate 1
Although the liquid content of the cathode plate 2 remains unchanged 77), the electrolyte in the separator 4 decreases. This is due to the difference in the pore size of the active materials of the anode plate 1 and the cathode plate 2 and the apparent space diameter of the separator l, and is due to the decrease in the electrolyte in the separator 4, which has a large space diameter. .

In the current paste filling method, the contact between the electrode plate and the separator 4 may be partially insufficient due to variations in the electrode plate thickness and smoothness F, pack ring, etc. Furthermore, since the amount of electrolyte impregnated varies depending on the variation in the active material season, when the amount of electrolyte decreases, the contact resistance between the electrode plate and the separator 4 increases extremely, and the internal resistance of the battery increases. The entire purpose of the present invention is to eliminate the above-mentioned drawbacks, which have the disadvantage of causing an early capacity drop or, in extreme cases, causing an initial variation in capacity.

Means for Solving the Problems In order to achieve the above object, the present invention interposes a material such as glass between the frame plates, and injects an electrolyte exceeding a predetermined amount to ensure monopolarity. Electrolyte to intervening parts such as plates, cathode plates, glass, etc.? After impregnation, the excess "s4E'4" liquid is discharged from the discharge hole to ensure an appropriate amount of electrolyte.

As a result, even if variations in the smoothness of the electrode plates or buckling occur, the increase in internal resistance can be completely suppressed by bringing the B plate into contact with the fibers such as glass, thereby reducing the lifespan. can be improved.

Example The laughing side of this invention? This will be explained starting from Figure 1, number 2.

One anode plate 1, two cathode plates 2, and fibers 3 such as glass that serve to hold the electrolyte between the plates and isolate the plates.
A sealed lead-acid battery having a structure in which a drain hole 6 is arranged at the bottom of a tank 5 is shown.

In this way, M! of glass etc. is placed between the electrode plates. ! 11. By filling and intervening the fibers 3. The entire surface of the electrode plate can be brought into reliable contact with the fibers 3 such as glass. The injection of electrolyte is
First, is the drain hole 6 plug at the bottom of the cell? Keep it closed and use the specified amount of electrolyte. Inject it for sure! Contained in fiber 3 such as poles and glass? 2Tru. Methods include leaving it for a long time or degassing it under reduced pressure.

After impregnation, remove the plug YC to drain excess electrolyte 7.

Seal lead-acid flood with the structure according to the present invention and seal lead-acid flood with the conventional structure? l! 1. (Both are 6M1.Fl type)k ordinary method ζko,
A continuous constant voltage overcharge test of 6.8V was carried out at 40°C, and the results are shown in the figure YTM4. The conventional sealed lead batteries lost capacity in less than 1.0 years due to an increase in resistance at the V:J section. The seal lead 11i fil according to the present invention decreased.
H was flt'L for about 1.5 years.

Effects of the Invention As described above, by employing the electrolyte injection method of the present invention, it is possible to impregnate the electrode plate and fibers such as glass with the VR fire fC cosmolysis solution, and to prevent contact between the b plate and # fibers such as glass. It has great industrial value, such as keeping the resistance low and providing an excellent battery life of 40 hours.

[Brief explanation of drawings]

The first cell is a schematic cross-sectional view showing a sealed lead battery according to an embodiment of the present invention, the second cell is a schematic cross-sectional view showing a conventional sealed lead battery, and FIG. 3 is a distribution diagram of the electrolyte in the electrode plate group. FIG. 4 is a curve diagram showing the results of a constant voltage life test on a sealed lead battery obtained according to the present invention and a conventional sealed lead battery.

Claims (1)

[Claims] In a sealed lead-acid battery that has an unmolded glass or other fiber interposed between the electrode plates and a drainage hole at the bottom of the cell, an electrolyte exceeding a predetermined amount is injected to remove the anode plate, cathode plate, and glass or other fiber. A method for injecting an electrolyte into a sealed lead-acid battery, characterized by impregnating a portion with an electrolyte in between, and then draining excess electrolyte from a drainage hole to ensure an appropriate amount of electrolyte in the electrode plate group. .