JPH06342671A - Lead-acid battery - Google Patents

Abstract

PURPOSE:To provide a liquid type lead-acid battery, which has a long lifetime even in the case where a deep discharge is repeated. CONSTITUTION:A lead-acid battery has a positive plate, of which grid is made of lead alloy containing Sb at 0-2 mass %, and the electrolyte, which is gelatinized partially to be flowed freely. A separator having a rib, a separator formed with emboss or a separator using a glass mat and a flat separator together is used for this battery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead acid battery having a fluid electrolyte.

[0002]

2. Description of the Related Art A lead-acid battery having a fluid electrolyte such as a lead-acid battery for an automobile uses a lead alloy containing no Sb or a lead alloy containing 2% by mass or less of Sb in order to reduce or eliminate the rehydration work. A grid-shaped positive electrode plate is used. Further, in order to improve the flow and degassing of the electrolytic solution, a separator having ribs, a separator formed with embossing, or a separator using a coarse glass mat with a fiber diameter of about 19 μm and a flat plate separator is also used. Has been.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The positive electrode plate using the grid body made of a lead alloy in which b is 0 to 2 mass% has a problem that when a deep discharge is repeated, a passivation layer is formed on the surface of the grid body and the life becomes early. It was
In addition, when a rib- or embon-formed separator or a combined separator of a glass mat and a flat plate-shaped separator is used for this lead-acid battery, sulfuric acid is supplied to the surface of the grid to improve the diffusion of the electrolyte solution to the positive electrode plate. There is a problem that the corrosion layer on the surface of the lattice is discharged before the active material is discharged and the capacity is reduced.

The present invention has been made in view of the above problems, and an object thereof is to provide a long-life lead-acid battery having a fluid electrolyte.

[0005]

In order to achieve the above object, the present invention provides a positive electrode plate using a grid made of a lead alloy having 0 to 2% by mass of Sb, and a partially gelled flowable plate. And a different electrolytic solution. Then, it is preferable to use a separator having ribs, a separator having an emboss, or a separator in which a glass mat and a plate-shaped separator are used in combination. further,
The amount of SiO ₂ added to the electrolytic solution is preferably 0.5 to 3 mass%.

[0006]

[Operation] When a partially gelled electrolyte is used, the electrolyte has fluidity and the gelled electrolyte adheres to the electrode plate group. The diffusion of the electrolyte solution in which the gel electrolyte solution adhering to the positive electrode plate flows to the positive electrode plate surface is restricted, corrosion of the grid surface is suppressed, and discharge of the corrosion layer is prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Three positive electrode plates using a Pb-Ca-Sn alloy lattice, four negative electrode plates, and a base thickness of 0.3 between them.
mm, and the height of the rib was 0.7 mm, the separator was stacked so that the rib faces the positive electrode plate to form an electrode plate group, which was inserted into the battery case. The electrolytic solution was prepared by adding SiO ₂ (Aerosil 200) to sulfuric acid having a specific gravity of 1.28 and stirring the solution well. The amount of SiO ₂ added to sulfuric acid was set as shown in Table 1, and six types of batteries were made as prototypes. Next, these batteries (5H
R capacity 40Ah) discharge current 8A, discharge end 1.7V /
The capacity was investigated by carrying out a cycle life test in which the cell, the charging current was 4 A, and the charge amount was 120% of the discharge amount. The results are shown in Table 1. The life ratio in Table 1 was determined by determining the cycle of each battery when the time to reach the final discharge voltage was less than 3 hours, and the value of each battery was set with the conventional product A as 100.

[0008]

[Table 1]

From Table 1, it was found that the batteries B to E of the present invention had a longer life performance than the conventional product A. It was also found that the comparative product F had no electrolyte flowing into the electrolyte and absorbed oxygen in the outside air through the cracks of the gelled electrolyte to the negative electrode plate to have an early life.

[0010]

Since the present invention is configured as described above, it is possible to provide a lead-acid battery having a long life.

Claims (3)

[Claims] 1. A lead storage battery comprising: a positive electrode plate having a lead alloy having a Sb content of 0 to 2% by mass as a lattice, and a partially gelled flowable electrolyte solution. 2. The lead storage battery according to claim 1, wherein a separator having ribs, an embossed separator, or a separator in which a glass mat and a flat plate-shaped separator are used in combination is used. 3. The electrolytic solution contains 0.5 to 3% by mass of SiO _2.
The lead storage battery according to claim 1, wherein the lead storage battery is added.