JPS61190868A - Sealed lead-acid battery - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

Conventional technology In conventional sealed lead-acid batteries in which the negative electrode absorbs and removes oxygen gas generated from the positive electrode, there are no batteries in which multiple electrode groups are inserted in the same cell, and all of them have one electrode group in each cell. is inserted. For example, as shown in FIG. 2, 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 10 is welded to the shelf 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 to prevent it from coming off.

Liquid type (JI) is used for inserting multiple electrode plate groups into the same cell.
It has been adopted in the islooo-)is2500 type of battery specified by SC8704, hereinafter referred to as a liquid type battery. 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 the battery case smaller. There are problems such as a decrease in strength. Therefore, in addition to dividing the electrode plates into appropriate widths, the battery case is provided with a reinforcing partition.
A group of electrode plates is inserted into each block. The reinforcing partitions are sized to allow the electrolyte from each block to diffuse. To explain this with reference to FIG. 3, the interior 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 upper end of the reinforcing partition is located at the bottom of the wall above the lowest liquid level, so that the electrolyte can freely flow between the blocks.

Problems to be Solved by the Invention When such a conventional configuration is applied to a sealed lead-acid battery in which the electrolyte is regulated, the electrolyte is only impregnated into the electrode plates and the non-woven mat made of glass fiber, etc. It can be considered that there is no flow of electrolyte between the electrode plate groups. 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 number of electrodes is small, gas absorption will be concentrated, and the discharge of the negative electrode plate will progress over time, resulting in a significant capacity drop (V).Also, if one electrode group absorbs gas generated from another electrode plate group, concentration will occur. For example, 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 the electrode plates in the same cell.

The present invention solves the problems caused by the large limit 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 extends life. The purpose is to

Means for Solving the Problem In order to solve this problem, in the sealed lead-acid battery of the present invention, a gel electrolyte is injected into a plurality of electrode plates inserted into the same cell. The electrolytic solution was passed through a reinforcing partition provided integrally with the battery case and brought into contact with each electrode plate group.

It is possible to improve the reliability of the sealed lead-acid battery and to significantly extend its life.

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

In FIG. 1, 14 is a gel-like electrolytic solution, which is used for each electrode plate group inserted into the same cell of the battery case 1, which is divided into a plurality of blocks by a reinforcing partition 13 that allows gas to flow. The liquid is injected from the upper part of 12 until it reaches the upper part of partition 13.

By doing so, the gel electrolyte 14 passes over the reinforcing partition 13 and comes into contact with each electrode plate group 12.12.

Using this gel electrolyte, we prepared a negative electrode absorption type sealed lead-acid battery with a 10-hour rate capacity of 1000 Ah, in which four electrode groups were inserted into the same cell, and the capacity of each electrode group during use was The changes and the amount of corrosion on the positive electrode plate were investigated. As a comparison product, a negative electrode absorption type lead-acid battery having the same structure as that of the example product was used, except that the gel electrolyte was used as an electrolyte whose amount was regulated.

The test method was to carry out trickle charging at 2.25 to 2.30 V/cell for 2 years at 4C)C, measure the 10 hour rate capacity of each electrode plate group for both the example product and the comparative product, and then disassemble it.
The amount of corrosion on the positive electrode plate of each electrode plate group was investigated.

A 10-hour rate capacity test was conducted for each electrode plate group, so the battery was discharged at 25 A to 1.80 μ. The temperature was 26°C. Numbers are given sequentially from the smoke end. The amount of corrosion on the positive electrode grid is an average value. The results are shown in the table. However, in a comparison product that does not use a gel electrolyte, gas absorption is uneven; The capacity of the electrode plate group decreases due to a decrease in the capacity of the negative electrode plate, and in these electrode plate groups, which absorb a lot of gas, the gas flows more slowly than in other electrode plate groups, which causes corrosion of the positive electrode grid. The number is increasing.

The battery life is not listed in IIS O8704, etc.
When the 10-hour rate is specified as 80% of the capacity, the waste of the comparative product 2
As a result of various studies, we found that the separator made of non-woven fabric and the gel electrolyte 14 injected up to the upper part of the electrode plate group have almost the same service life. It was found that the amount of corrosion on the positive electrode grid was made uniform, making it possible to extend the lifespan even further.

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 with a reinforcing partition that allows gas to flow, and a group of electrode plates is inserted in each block. By bringing the electrode groups into contact with a gel electrolyte, the amount of electrolyte and gas absorption in each electrode group can be made uniform, thereby preventing variations in capacity between each electrode group and abnormal corrosion of the positive electrode grid. This makes it possible to use a battery case similar to that used for liquid-type batteries, where the amount of liquid is regulated.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a sealed lead-acid battery according to an embodiment of the present invention, FIG. 2 is a sectional view of a conventional sealed lead-acid battery, and FIG. 3 is a sectional view of a conventional sealed lead-acid battery.
The figure is a partial cross-sectional view showing an example of a conventional liquid battery in which a plurality of electrode plate groups are housed in the same cell. 1... Battery case, 12... Electrode plate group, 13.
... Reinforcement partition, 14 ... Gel electrolyte. Name of agent: Patent attorney Toshio Nakao and 1 other person!・
...i Nessau 13... Recite 61M Preface 1 Officer σ Sono 4...ke) G-X4F, Figure 2

Claims (2)

[Claims] (1) A sealed lead-acid battery that uses a battery case with a reinforcing partition that allows gas to flow, and a gel electrolyte that is in continuous contact with a group of multiple electrode plates inserted into the same cell. A sealed lead-acid battery is characterized in that it is injected with the following elements, and each electrode plate group is connected to the other. (2) The sealed lead-acid battery according to claim 1, wherein the separator constituting the electrode plate group is a nonwoven fabric.