JP2002313410A - Seal type lead acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excellent seal type lead acid battery with an increased service life and performance. SOLUTION: In this seal type lead acid battery, electrolyte is held by using a liquid absorbing separator, and gel electrolyte is disposed in a space between a plate group and an electric battery. The sum of the wt.% of colloidal silica in the electrolyte held by the separator and the wt.% of colloidal silica in the gel electrolyte around the plate group is 5.5 or higher, and the wt.% of colloidal silica in the gel electrolyte around the plate group is equal to or higher than the wt.% of colloidal silica in the electrolyte held by the separator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sealed lead-acid battery.

[0002]

2. Description of the Related Art In recent years, in automotive applications, a sealed lead-acid battery has been increasingly used in place of a conventional open lead-acid battery. This is because in sealed lead-acid batteries, the oxygen gas generated in the positive electrode plate is absorbed by the negative electrode plate, so there is no need to refill the electrolyte with a small amount of electrolyte solution, or use it position-free, such as by placing the battery horizontally. This is because there are various merits such as the ability to do so.

[0003] As shown in FIG.
Different types are known. It is a gel type in which the electrolyte is gelled with fine silica, a retainer type in which the electrolyte is held in a glass mat made of fine liquid-absorbing glass fibers, There are three types, a granular silica type in which an electrolytic solution is held inside the granular silica filled in the gap with the battery case and in the gap between the silica particles.

[0004]

The gel type has a drawback that the electrolyte is gelled because the electrolyte is gelled, so that the diffusion performance of the electrolyte is reduced and the performance of the battery is reduced. Although the retainer type has good diffusion performance of the electrolytic solution, it has a drawback that the amount of the electrolytic solution is small and the area of the electrolytic solution in contact with the battery case is small, so that the temperature of the battery during use is greatly increased. Therefore, there are problems such as lattice corrosion and an excessive decrease in the amount of the electrolytic solution. Also, the granular silica method has no problem in performance because the diffusion of the electrolytic solution is good and the heat capacity of the electrolytic solution is large, but it takes too much time to fill the silica or inject the electrolytic solution, which increases the cost. There were drawbacks.

[0005] Therefore, as a battery that is low in cost, rapidly diffuses the electrolyte, and can suppress a rise in battery temperature,
In recent years, a gel-retainer hybrid sealed lead-acid battery of a type in which a gel electrolyte is injected into a gap between an electrode group and a battery case of the sealed sealed battery shown in FIG. 2 has been studied. However, this battery has some contradictions. If the gel electrolyte injected around the electrode plate group does not have a certain degree of hardness, the heat generated in the electrode plate cannot be transmitted to the battery case wall. To make the gel harder, the amount of colloidal silica should be increased, but this would slow down the movement of the electrolyte, which would impair the life performance.

As a result of various tests, the sum of the weight percent of colloidal silica in the electrolyte held by the separator and the weight percent of colloidal silica in the gel electrolyte around the electrode group is 5.5 or more, and the electrode group is It was found that when the weight% of colloidal silica in the surrounding gel electrolyte was equal to or higher than the weight% of colloidal silica in the electrolyte held by the separator, the life performance was greatly improved.

[0007]

According to the first aspect of the present invention, an electrolytic solution is held using a liquid-absorbing separator, and a gelled electrolytic solution is disposed in a gap between an electrode plate group and a battery case. A sealed lead-acid battery having a structure in which colloidal silica is contained in the electrolyte held by the separator and colloidal silica is contained in the gel electrolyte around the electrode assembly.
Is 5.5 or more, and the weight percent of colloidal silica in the gel electrolyte around the electrode plate group is equal to or greater than the weight percent of colloidal silica in the electrolyte held by the separator. It is a sealed type lead storage battery characterized by the above-mentioned.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The sealed lead-acid battery according to the present invention is a gel-retainer hybrid sealed lead-acid battery, wherein the weight percent of colloidal silica in the electrolyte held by the separator and the gel around the electrode plate group are measured. The sum with the colloidal silica weight% in the electrolytic solution is 5.5 or more,
In addition, the weight percent of colloidal silica in the gel electrolyte around the electrode group is equal to or greater than the weight percent of colloidal silica in the electrolyte held by the separator. By doing so, the life performance can be significantly improved, and an excellent sealed lead-acid battery can be obtained.

[0009]

Embodiments of the present invention will be described below.

First, a base material of Pb-
After rolling a continuous cast plate of 0.07 wt% Ca-1.3 wt% Sn alloy with a rolling roller to produce an integrated rolled sheet having a thickness of 1.0 mm, the rolled sheet is developed into a mesh shape. An expanded grid was obtained. These lattices were filled with a paste produced by kneading lead powder, lead red and dilute sulfuric acid, aged and dried to produce a positive electrode plate. Five of these positive electrode plates and a 1.0 mm thick Pb-0.07
the wt% Ca-1.3wt% Sn alloy rolled expanded grid obtained by expanding a sheet similar to the mesh-like, lignin sulfonic acid, a BaSO ₄ and a mixture of carbon was lead powder and paste manufactured kneaded and dilute sulfuric acid Six negative electrode plates prepared by filling, aging and drying were alternately laminated via a fine glass fiber separator to form an electrode group.

These electrode plates are inserted into a battery case, and a predetermined amount of dilute sulfuric acid containing a predetermined amount of carbon and a small amount of colloidal silica (0 to 4% by weight) is injected to form a 2V30Ah sealed lead. A storage battery was manufactured. After the formation, a sol solution in which dilute sulfuric acid and a predetermined amount (1.5 to 12% by weight) of colloidal silica are mixed is injected into the battery and gelled in the battery, so that various gel-retainer hybrid seals are obtained. A lead-acid battery was fabricated.

After attaching a normal safety valve to the batteries, the batteries were discharged at 10 A (１ ／ CA) for 2.4 hours, and charged at a constant current of 10 A to 90% of the discharged amount.
Charge 20% of the discharge amount with a constant current of 1.5A.
Charging was performed by the step constant current method. The test was performed at 40 ° C.
Was carried out in an air tank. 10A every 50 cycles
The discharge capacity was confirmed at a current of (１ ／ CA).
For comparison, a conventional retainer-type battery in which no gel was injected around the electrode group was also manufactured and evaluated.

Table 1 shows the results of the life test. The numerical values in Table 1 are the number of life cycles in each case.

[0014]

[Table 1]

As set forth in claim 1 of the present invention, in the gel-retainer hybrid sealed lead-acid battery, the colloidal silica weight% in the electrolytic solution held by the separator and the colloidal silica in the gel electrolytic solution around the electrode plate group. The sum with the silica weight% is 5.5 or more, and the colloidal silica weight% in the gel electrolyte around the electrode group is the same as the colloidal silica weight% in the electrolyte held by the separator. When it was made longer than that, the life performance was remarkably improved.

[0016]

As described above, by using the present invention, the life performance can be significantly extended, and an excellent sealed lead-acid battery can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of various sealed lead-acid batteries.

FIG. 2 is a schematic view showing a schematic configuration of a gel-retainer hybrid sealed lead-acid battery.

Claims (1)

[Claims] 1. A sealed lead-acid battery having a structure in which an electrolytic solution is retained using a liquid-absorbing separator and a gelled electrolytic solution is disposed in a gap between an electrode plate group and a battery case,
The sum of the weight% of colloidal silica in the electrolyte held by the separator and the weight% of colloidal silica in the gel electrolyte around the electrode group is 5.5 or more, and the gel around the electrode group A sealed lead-acid battery in which the weight percent of colloidal silica in the electrolyte is equal to or greater than the weight percent of colloidal silica in the electrolyte held by the separator.