JPS62136750A - Hermetically sealed lead storage battery - Google Patents

Abstract

PURPOSE:To prevent unevenness in the quantity and concentration of sulfuric acid electrolytic liquid inside a glass mat so as to improve the charge/discharge property of a battery, by pouring electrolytic liquid into a battery case after housing a plate group therein so that the electrolytic liquid may be gelatinized by means of fine powder. CONSTITUTION:Glass fibers are employed as the major portion of a hermetically sealed lead storage battery and a sheet-shaped glass mat is formed so that a positive plate and a negative plate are disposed inside said glass mat via another glass mat on which silicon compound fine powder is uniformly distributed, thus assembling a plate group. After this assembled plate group is housed inside a battery case, electrolytic liquid is poured therein. The electrolytic liquid is gelatinized by means of fine powder after being poured in so that the quantity and concentration of the sulfuric acid electrolytic liquid inside the glass mat may be prevented from becoming uneven, thus stabilizing repeated charge and discharge.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The invention relates to the preparation and retention of electrolyte in a sealed lead acid battery having a completely sealed structure and the ability to absorb oxygen gas generated inside the battery.

[Conventional technology]

A completely sealed structure is made possible by absorbing the oxygen gas generated when the battery is charged inside the battery. Sealed lead-acid batteries are made using electrolytic technology that is retained using a special method to efficiently absorb oxygen gas. liquid is used.

In other words, in conventional lead-acid batteries, the battery is constructed by immersing the electrode plate group in an electrolyte of sulfuric acid aqueous solution, but in order to absorb oxygen gas, V- is There are many negative electrode surfaces that are active in the absorption reaction of (2
) It is necessary to allow oxygen generated at the positive electrode to easily reach the negative electrode.

In order to create such a state, in current sealed lead-acid batteries, the amount of electrolyte used is reduced, and the solution is impregnated into a glass mat placed between the positive and negative electrode plates.

[Problem that the invention seeks to solve]

However, in this method, sulfuric acid in an aqueous solution state is held in the pores of the glass mat circle by capillary 5A urine, so as the height of the glass mat increases, a predetermined amount of @acid at a predetermined concentration increases. It becomes extremely difficult to maintain the glass mat uniformly, and a "stratification phenomenon" occurs in which a high concentration of sulfuric acid is present in the lower part of the glass mat. When this phenomenon occurs, the electrode plate 8 that does not come into contact with a sufficient amount of sulfuric acid no longer participates in the discharge.
As a result, the number 'RL amount becomes small, which has a drawback. Moreover, when stratification occurs, the #LrIR resistance increases in the lower part of the battery, and corrosion progresses in the lower part of the positive electrode plate in contact with this liquid, which also affects the battery life. Moreover, once this stratification occurs, it is extremely difficult to eliminate it.
Prevention of stratification is a major issue in the design of sealed lead-acid batteries.

The purpose of the present invention is to uniformly distribute the electrolyte within the separator between the electrode plates.
To provide a sealed lead-acid battery that improves the drawbacks of conventional sealed lead-acid batteries in which it is difficult to hold the battery inside and out, and ensures uniformity of liquid density and liquid volume even when the electrode plates are enlarged. There is a particular thing.

[Means for solving problems]

To summarize the present invention, misfire 8A is an invention related to a sealed lead-acid battery, and is a sheet-like crow mat P'3ffiS formed mainly of crow fibers, in which fine powder of a silicon compound is uniformly distributed. The electrode plate group is assembled by arranging the positive electrode plate and the negative electrode plate mutually,
It is characterized in that the electrolytic solution is press-fitted after the electrode plate group is housed in a battery container, so that the electrolytic solution is gelled.

A nine-sealed lead-acid battery 'C according to the present invention is constructed by assembling a group of electrode plates using a glass mat containing a silicon compound in advance, and then press-fitting a rapid rR electrolyte and then gelling the liquid within the battery separator. It is characterized by allowing

The cause of the decrease in the capacity of lead-acid batteries is the sulfuric acid contained in the glass mat. The reason for this is that it moves to the bottom during discharge. That is, even if tL acid is initially held at a uniform concentration on the electrode plate, as the test is repeated, the sulfuric acid in the upper part gradually begins to flow down to the lower part. If this happens, the upper part of the electrode plate will not come into contact with enough sulfuric acid and will no longer participate in the battery reaction, and eventually only the lower part of the electrode plate that is in contact with the sulfuric acid will be discharged, causing the entire battery to discharge. capacity decreases. However, in the present invention, there was no decrease in capacity even after charging and discharging cycles, and the abnormal flow of liquid that was observed in sealed lead-acid batteries tabulated using the conventional method did not occur. This is presumed to be because in the battery according to the present invention, sulfuric acid is sufficiently captured and fixed by the glass fibers and silicon compound fine particles.

Although the glass mat itself used in the present invention can be any ordinary one, glass fibers having an average diameter of 10 μm or less are particularly suitable.

Next, examples of silicon compounds distributed in this are 5
102, and those with a particle size of 100 μm or less are suitable. The appropriate amount of addition is 1 to 7% by weight based on sulfuric acid. When the temperature exceeds 7M, the sulfuric acid and 81 react with each other, causing the sulfuric acid to solidify, which poses a practical problem. On the other hand, 1N
If the amount is less than 1, the effect will not be practical.

〔Example〕

Hereinafter, all embodiments of the present invention will be explained in detail in *, but the present invention is not limited thereto.

Example 1 Here, an F charge/discharge cycle test was conducted on two types of batteries with a total height of 700 m, one manufactured according to the present invention and one manufactured by a conventional method. The conditions for the charge/discharge cycle test are as follows.

Discharge: α10 (187) Charge: 2.5V, 48 hours The results of this test are shown in FIG. In other words, Figure 1 shows the charge/discharge cycle test results in terms of the number of discharges (horizontal axis) and discharge IL (%).
, is a graph shown in relation to the vertical axis. In the figure, the symbol Δ indicates the embodiment of the present invention, and the symbol O indicates the conventional example. In the conventional liquid retention method, the discharge duration during the charge/discharge cycle test greatly decreases with the number of discharges, but in the examples of the present invention, there was almost no change in the discharge time.

It is clear from these results that by carrying out the present invention, it is possible to prevent the liquid distribution that occurs in FC batteries manufactured using conventional techniques.

〔Effect of the invention〕

If the method described above is used according to the present invention, f! It is possible to prevent non-uniformity in the amount and degree of L acid electrolyte, and it is possible to realize a sealed lead-acid battery that exhibits stable performance even when used under repeated charging and discharging conditions.

Further, as shown in the examples, the present invention is also effective in sealed lead-acid batteries using large-sized electrode plates, and has great effects in manufacturing large-sized sealed lead-acid batteries.

[Brief explanation of drawings]

FIG. 1 is a graph showing the results of a charge/discharge cycle test of a sealed lead-acid battery manufactured using an embodiment of the present invention and a conventional technique.

Claims (1)

[Claims] 1. An electrode plate group is assembled by alternately arranging positive and negative electrode plates through a glass mat in which fine powder of a silicon compound is evenly distributed inside a sheet-like glass mat made of glass fiber as a living body. 1. A sealed lead-acid battery, characterized in that the electrolytic solution is injected after the electrode plate group is housed in a battery container, so that the electrolytic solution is gelled by the fine powder.