JPS60193275A - Sealed lead-acid battery - Google Patents

Abstract

PURPOSE:To improve reliability and increase life by bringing a porous material into contact with a plurarity of plate groups which are inserted into the same cell over a reinforcing partition. CONSTITUTION:A plate-shaped porous material 14 is inserted into the same cell of a container divided with a reinforcing partition 13 through which gas is permeable so as to contact each plate group 12. The porous material 14 consists of material same as a separator comprising fine glass fibers. The electrolyte volume and gas absorbing ability in each plate group become uniform, and capacity scattering in every plate group and abnormal corrosion of positive grid can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sealed lead-acid battery used in constant voltage charging methods such as long-term float charging and trickle charging.

Configuration of conventional example and its problems Oxygen gas generated from the positive electrode in the conventional negative electrode -1-
Sealed lead-acid batteries that absorb and remove carbon dioxide do not have multiple electrode groups inserted into the same cell, but all have one electrode group inserted into each cell. For example, as shown in FIG. 1, negative electrode plates 2, separators 3, and positive electrode plates 4 are stacked alternately in a battery case 1, and the positive and negative electrode plates are welded to each other at a shelf 9. A pole post 1o is welded to the shelf portion 9, and a terminal 11 is attached to the pole post 1o. Further, the lid 6 is bonded to the battery case 1. A cap-shaped safety valve plug 8 made of synthetic rubber is attached to a portion of the lid 6 corresponding to each cell, and is held by the upper lid 7 so as not to come off.

Liquid type (JI) is used for inserting multiple electrode plate groups into the same cell.
It is used in batteries specified by SC8704 (hereinafter referred to as liquid type) batteries H81000 to H82500. This takes advantage of the fact that small plates have low electrical resistance inside the plate, but on the other hand, the amount of plates used per cell increases, and the width of the plate group increases, making it difficult to fit the battery case. Since there are problems such as a decrease in strength, the battery case is divided into appropriate widths, a reinforcing partition is provided in the battery case, and a plate group is inserted into each block. The reinforcing partition has a size that allows the electrolyte in each block to diffuse. To explain this with reference to FIG. 2, the inside of the battery case 1 is divided into a plurality of blocks by a reinforcing partition 13, and a group of electrode plates 12 is inserted into each block. The reinforcing partition is provided far below the lowest liquid level, allowing free flow of electrolyte between each block.

If this is applied to a sealed lead-acid battery whose electrolyte is regulated, the electrolyte is only impregnated into the electrode plates and the non-woven mat made of glass fiber, and there is no flow of electrolyte between each electrode plate group. You can think about it. Additionally, if there is a difference in the amount of electrolyte between each plate group, there will be a difference in the amount of oxygen gas absorbed between each plate group, and this will cause a difference in the amount of oxygen gas absorbed between each plate group. If the battery is low), concentration of gas absorption occurs, and discharge of the negative electrode plate progresses over time, leading to a significant decrease in capacity. Also, if the absorption of gas generated from other cells is concentrated in one electrode group,
As the potential of the negative electrode decreases, the charging current increases, promoting lattice corrosion of the positive electrode plate, and causing a difference in the lifespan of a group of electrode plates in the same cell.

Purpose of the Invention The present invention solves the problems caused by the large limitation on the amount of electrolyte in sealed lead-acid batteries in which a large number of electrode plates are inserted into the same cell, and improves reliability and longevity. The purpose is to extend the service life.

Structure of the Invention In order to achieve the above object, in the sealed lead-acid battery of the present invention, a porous body capable of absorbing electrolyte is integrally provided in the battery case for a plurality of electrode plate groups inserted into the same cell. It is characterized in that it is passed over the reinforcing partition and brought into contact with each adjacent electrode plate group.

Note that the porous body may be in the shape of a cylindrical bag or a flat plate, and each electrode plate group may be wrapped in the same porous body and inserted into the battery case. Further, only the portion into which the electrode plate group is inserted may be cylindrical or bag-shaped.

This is particularly effective when the porous body contacts all the separators or covers the negative end plate.

With this configuration, it is possible to improve the reliability of a sealed lead-acid battery in which a plurality of electrode plates are inserted into the same cell, and to significantly extend the life of the battery. .

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Note that the same amounts are given to the parts having the same configuration as in the conventional example, and the explanation thereof will be omitted.

In FIG. 3, reference numeral 14 denotes a porous flat continuous body that is in contact with each electrode plate group 12 inserted into the same cell of the battery case 1 divided by a reinforcing partition 13 that allows gas to flow. It is. This porous body 14 was made of the same separator made of fine glass fiber used in the electrode plate group.

A negative electrode absorption lead-acid battery with a 10 hour rate capacity of 1000 Ah was prepared using this flat porous body and four electrode plate groups were inserted into the same cell, and the capacity change of each electrode plate group during use and the positive electrode plate were prepared. The amount of corrosion was investigated. A negative electrode absorption type lead-acid battery having the same configuration except for the porous body 14 was used as a blank.

The test method was to carry out trickle charging at 2.26 to 2.30 V/cell at 40°C for two years, measure the 10-hour rate capacity of each electrode plate group for both this example product and the blank, and then disassemble it. The amount of corrosion on the positive electrode plate of the electrode plate group was investigated.

The 10-hour rate capacity test is conducted for each electrode group, so the capacity test is 260A.
't'1.80VtT discharge end. The temperature was set at 26°C.

Numbers are given below in order from the bottom edge of the margin. (Note) The amount of corrosion on the positive electrode grid is an average value. The results are shown in the table. However, in blanks that do not use porous materials, gas absorption is biased and the capacity of the negative electrode plate decreases. This causes a decrease in the capacity of the electrode plate group due to the amount of gas absorbed, and in the electrode plate groups that absorb a lot of gas, a larger amount of charging current flows than in other groups, so that the positive electrode grid is more likely to be corroded.

If the battery life is specified as 5ot16 with a 10 hour rate capacity according to the description of ll5O8704, etc., the blank battery life is 2.
The group can be said to have almost a lifetime.

As a result of various studies, the porous body 14 was made into a cylindrical shape.

It has been found that when the bag-shaped material is brought into close contact with the negative electrode plate, the amount of corrosion of the positive electrode grid in each electrode plate group is made uniform, making it possible to further extend the service life.

Good results were also obtained when a plurality of electrode plate groups were assembled and connected using a strip-shaped continuous separator.

Effects of the Invention As described above, the present invention provides a sealed lead-acid battery in which a battery case is divided into a plurality of blocks by a reinforcing partition that allows gas to flow, and a group of electrode plates is inserted in each block. By bringing porous bodies of various shapes into continuous contact with adjacent electrode plate groups, the amount of electrolyte and gas absorption in each electrode plate group can be made uniform, and the capacity variation of each electrode plate group and the positive electrode grid can be reduced. This prevents abnormal corrosion, making it possible to use this type of battery case in the same way as liquid batteries.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a conventional sealed lead-acid battery, Fig. 2 is a cross-sectional view of a conventional liquid-type battery in which a plurality of electrode plate groups are housed in the same cell, and Fig. 3 is a cross-sectional view of a conventional liquid battery according to the present invention. FIG. 1 is a cross-sectional view of a sealed lead-acid battery according to an example. 1... Battery case, 12... Electrode plate group, 13.
...Reinforcement partition, 14...Porous body. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 1? 12

Claims (1)

[Claims] (1) A sealed lead-acid battery using a battery case with a reinforcing partition that allows gas to flow, in which a porous material is inserted into a group of multiple electrode plates inserted into the same cell. A sealed lead-acid battery characterized by connecting each electrode plate group by bringing them into contact with each other. (2) The sealed lead-acid battery according to claim 1, wherein the porous body has a flat plate shape. (3) The sealed lead-acid battery according to claim 1, wherein the porous body is cylindrical. (4) The sealed lead-acid battery according to claim 1, wherein the porous body is cylindrical only at the portion where the electrode plate group is inserted. (6) The sealed lead-acid battery according to claim 1, wherein the porous body is bag-shaped only in the portion into which the electrode plate group is inserted. (6) The sealed lead-acid battery according to claim 1, wherein the porous body is bag-shaped. (7) The sealed lead-acid battery according to claim 1, wherein the porous body is in contact with all the separators. (8) The sealed lead-acid battery according to claim 1, wherein the porous body covers the negative end plate.