JPH0443384B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a sealed lead acid battery. [Prior art] In general, in this type of battery, the electrolyte is made substantially non-fluid, and the O ₂ gas generated from the anode plate during charging is absorbed into the spongy form of the cathode plate active material by the reaction shown in the equation below. Absorbed by lead. Pb+1/20 ₂ +H ₂ SO ₄ →PbSO ₄ +H ₂ O In this type of battery, the electrolyte decomposed on the anode plate generates H ₂ O on the cathode plate according to the above formula, so water retention is required when the battery is in use. There is no need to do this, and there is no need to worry about electrolyte leakage no matter what direction you tilt it. In this type of battery, for example, the retainer, which is made of fine glass fibers formed into a mat shape, is impregnated with electrolyte. After the retainer is placed between the electrode plates and stored in the battery case, the electrolyte is poured from the top of the battery case. This is done by injecting. Therefore, when injecting electrolyte into the retainer located between the electrode plates arranged in the battery case, the electrolyte gradually impregnates from the end of the retainer that is not in contact with the electrode plates, so that the retainer becomes The drawback was that it took an extremely long time to impregnate the electrolyte. Therefore, as shown in Japanese Unexamined Patent Publication No. 56-52865, in order to arrange a space along the retainer to facilitate degassing from the retainer made of glass fiber when impregnating with an electrolytic solution, a space was created in the vertical direction. A technique has been proposed in which a liquid guide member made of a plastic microporous sheet with a concavo-convex portion extending along the retainer is disposed. [Problems to be Solved by the Invention] By using the liquid guiding member disclosed in the above publication, it is possible to form multiple large spaces along the retainer that allow for good gas release, thereby greatly increasing the impregnation speed of the electrolytic solution. be able to. However, as this space becomes larger, the movement of the electrolytic solution located within this space, that is, the movement of sulfuric acid becomes easier, and a concentration difference occurs in the vertical direction in the electrolytic solution filled in this space. Such a concentration difference causes deterioration of charge/discharge performance. In addition, in conventional liquid guiding members, the liquid guiding member itself has almost no water absorbency, so it is not possible to increase the amount of electrolyte solution retained, and the liquid guiding member prevents ion conduction.
Decrease charge/discharge performance. An object of the present invention is to provide a sealed lead-acid battery that can quickly inject an electrolyte into a retainer made of glass fiber and that can improve rapid discharge performance. [Means for Solving the Problems] In order to solve the above problems, the present invention provides a sealed lead-acid battery in which a retainer made of glass fiber is arranged between electrode plates, and a plurality of water-absorbing sheets made of cellulose. A liquid guide member formed by stacking thin papers and joining each other in the stacking direction at a number of spaced locations is arranged along the retainer. [Function] When using a liquid guiding member made by stacking multiple sheets of water-absorbing thin paper made of cellulose and joining them to each other in the stacking direction at numerous locations at intervals, gas will flow between the joined thin papers. A large number of gaps are formed that serve as escape passages. When injecting the electrolyte into the retainer, the numerous gaps formed between the thin sheets serve as degassing passages, and the electrolyte is also injected into the retainer from the side through the water-absorbing thin paper. The electrolyte injection time can be shortened. Further, the electrolytic solution is retained not only in the retainer but also in the thin paper and in the numerous gaps formed between the thin sheets. As a result, the amount of electrolyte injected can be increased, and the liquid guiding member does not interfere with ion conduction. Furthermore, since the thickness of the gap formed between each thin paper is small and each thin paper has water absorption properties, the electrolytic solution impregnated in the liquid guiding member is difficult to move. A large concentration difference does not occur between the two. For the above reasons, according to the present invention, the retainer can be quickly impregnated with the electrolytic solution, and the electrolytic solution can be reliably retained to improve charging and discharging performance. [Examples] Examples of the present invention will be described in detail below with reference to illustrated examples. In FIGS. 1 and 3, 1 is a battery case, 2 is a cathode plate, and 3 is an anode plate. A retainer 4 made of fine glass fiber is placed between the cathode plate 2 and anode plate 3, and 100% cellulose is placed between the retainer 4 and the cathode plate 2 and between the retainer 4 and the anode plate 3. A plate-shaped liquid guide member 5 made of is arranged. As shown in FIG.
6 on top of each other at intervals (part A)
By joining with the inner part 7, 7
...is formed. Note that in FIGS. 2 and 3, in order to facilitate understanding, the intermediate portions 7, 7...
is extremely exaggerated. In the example, a thin paper with a thickness of a few tenths of a millimeter was used, the joint part (A part) was made to have a diameter of about 2 mm, and the third
As shown in the figure, the distance d between each joint (part A) is approximately
The liquid guiding member 5 is configured to have a thickness of 10 mm. Therefore, the thickness dimension of the inner portions 7, 7... that are actually formed,
In other words, the dimensions in the stacking direction are very small. In order to confirm the effects of the present invention, two types of sealed lead-acid batteries with a 5-hour rate capacity of 32 Ah were manufactured by changing the number of liquid guiding members, and a conventional similar battery without the liquid guiding member 5 and an electrolyte The time required for injection was compared. Battery A has 8 liquid guide members with a thickness of 0.4 mm when no load is placed between the electrode plate and the retainer, and 16 liquid guide members of the same size are interposed between the electrode plate and the retainer. The time required for injecting the electrolyte was measured for Battery B, which had a conventional battery B, and Battery C, a conventional battery that does not use a liquid guiding member, and the results shown in the table below were obtained. In this case, the retainer is made of 100% glass fiber with a diameter of approximately 0.7 μ, and has a thickness x width x height of 1.6 mm x 120 mm x 115 mm, and dilute sulfuric acid with a specific gravity of 1.310 is used as the electrolyte.
The solution was injected at a temperature of 25°C.

〔Effect of the invention〕

As described above, according to the present invention, since a liquid guiding member is used, which is formed by stacking a plurality of water-absorbing thin paper sheets made of cellulose and bonding them to each other in the stacking direction at a large number of places at intervals, the electrolyte When injecting the electrolyte into the retainer, the numerous gaps formed between the thin sheets become gas release passages, and the electrolyte is also injected into the retainer from the side through the water-absorbing thin paper. Liquid injection time can be shortened. In addition, the electrolyte is retained not only in the retainer but also in the many gaps formed between the thin sheets and in the thin sheets, so the amount of electrolyte injected can be increased, and the liquid guiding member Does not interfere with conduction. Furthermore, since the thickness of the gap formed between each thin paper is small and each thin paper has water absorption properties, the electrolytic solution impregnated in the liquid guiding member is difficult to move. A large concentration difference does not occur between the two. Therefore, according to the present invention, it is possible to quickly impregnate the retainer with the electrolytic solution, and it is also possible to reliably retain the electrolytic solution and improve charging and discharging performance.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing the electrode plate group of the sealed lead-acid battery of the present invention, FIG. 2 is a longitudinal cross-sectional view of the sheet-like liquid guiding member of the lead-acid battery of the present invention, and FIG. A partial plan view, FIG. 4 shows batteries A and B according to the present invention.
3 is a graph showing the test results of rapid discharge characteristics between the conventional battery C and the conventional battery C. 2... Cathode plate, 3... Anode plate, 4... Retainer, 5...
Liquid guiding member, 6...thin paper, 7...intermediate section, A section...junction section.

Claims (1)

[Scope of Claims] 1. In a sealed lead-acid battery in which a retainer made of glass fiber impregnated with an electrolytic solution is arranged between electrode plates, a plurality of water-absorbing thin papers made of cellulose are stacked one on top of the other and spaced apart from each other. 1. A sealed lead-acid battery, characterized in that liquid guiding members are arranged along the retainer and are mutually joined in the stacking direction at a number of open locations.