JPH1145734A - Sealed lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To infiltrate electrolyte evenly into the middle section of each plate in a plate group within a short time and improve stable battery characteristics, by accommodating a plate group in a battery jar such that it is wrapped with a retainer which includes silica in the center of a plane facing the group, is bag-shaped, and has liquid retention lower than that of a retainer between plates in a pressurized state in the battery jar, and by injecting electrolyte for battery-jar formation. SOLUTION: A bag-shaped retainer 4 decreases liquid infiltration rate outside of a plate group, prevents an electrolyte from penetrating rapidly, and allows the electrolyte to move easily in the plates. Therefore, it is made of nonwoven glass fiber material which has liquid retention lower than that of a retainer 3 in the plate group. Furthermore, the bag-shaped retainer 4 has a structure where surfaces other than its top are continuous so as to produce adhesion to the plate group and supply the electrolyte evenly all around plates. Because a silica adding section 6 is placed in the center of a plane facing the surface of the plate group, the electrolyte can easily move to the center of the plate group during the electrolyte injection, and adhesion to the whole plate group becomes higher.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed lead battery.

[0002]

2. Description of the Related Art Conventionally, this type of sealed lead-acid battery requires a very long injection time of an electrolytic solution into a group of electrodes in a battery case when forming a battery case. In order to solve the conventional problem that the liquid does not penetrate into the central part of the battery and the formation of the battery does not proceed sufficiently, the electrode plate group is wound with electrolyte-soluble thin paper and stored in the battery, Was injected (Tokuhei 5-
No. 40428)

[0003]

In the above-mentioned conventional sealed lead battery, the time required for injecting the electrolyte is long.
If the injection is accelerated, the liquid does not sufficiently penetrate into the central part of the electrode plate surface in the electrode plate group, and the battery case is not sufficiently formed, so that the battery performance is not stable.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an electrode plate group, which is formed in a bag-like shape containing silica at the center of a surface opposite to the electrode plate surface. In addition, the container is formed by wrapping in a retainer having a lower liquid holding ratio in a pressurized state than that of the retainer between the electrode plates, storing the container in the container, and injecting the electrolytic solution to form the container.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, an electrode group is formed by placing a central part of a surface opposite to a surface of an electrode group with a lower liquid retention rate than a retainer (made of a glass fiber nonwoven material) inside the electrode group. Wrapped in a bag-shaped retainer with silica added to it and stored in a battery case,
It is a sealed lead battery obtained by injecting an electrolytic solution and forming a battery case. The bag-shaped retainer reduces the liquid permeation rate outside the electrode group to prevent the electrolyte from abruptly penetrating, and facilitates the movement of the electrolyte into the electrode group. It is made of a glass fiber nonwoven material having a smaller liquid retention rate than the retainer. Furthermore, the bag-shaped retainer has a structure in which all sides except the upper part, the lower part, and all five sides are continuous for the purpose of adhesion to the electrode group and supplying the electrolyte uniformly to the whole outside of the electrode group. ing. Furthermore, the bag-shaped retainer is
For the purpose of facilitating the movement of the electrolytic solution to the central part of the electrode group and improving the adhesion to the entire electrode group, silica is added to the central part of the surface facing the electrode group surface. Therefore, according to the present invention, the electrolyte solution at the time of injection can be supplied in a short time to the entire electrode group through a path from the center and a path from the outside via the bag-shaped retainer in close contact with the electrode group. It efficiently penetrates, and there is no occurrence of air pockets caused by rapid penetration from the outside.

Accordingly, it has been found that the product of the present invention has stable battery performance without formation failure even if it is formed in a short time.

[0007]

Embodiments of the present invention will be described below. An unformed positive electrode plate 1 and a negative electrode plate 2 are alternately combined to assemble an electrode plate group with a retainer 3 made of a nonwoven glass fiber material interposed therebetween. This electrode plate group is placed at the center 6 of the surface facing the electrode plate group surface.
A bag-like retainer made of a glass fiber non-woven material having a particle system added with silica having a particle size of 2 to 50 μm (a liquid holding ratio in a pressurized state housed in a battery case is lower than a retainer 3 between the electrode plates) 4, Electrode group wrapped in the bag-shaped retainer 4 is stored in the battery case 5
(FIG. 1), and an electrolytic solution (dilute sulfuric acid) having a specific gravity of 1.260 was injected and impregnated so that nothing was released from the electrode group. Electrolyte is colored with methyl orange etc.
After one minute, the state of the negative electrode plate was examined (Table 1, showing the ratio (%) of the air pool to the electrode plate surface). The particle system is 2 to 50 in the other part except the central part of the surface facing the electrode plate group surface.
The battery of the comparative example (b) in which the electrode group was covered with a bag-shaped retainer made of a material to which μm silica was added (the liquid retention rate in a pressurized state stored in the battery case was lower than that of the retainer 3 between the electrodes) ), A comparative battery (c) in which the electrode group was covered with a bag-shaped retainer containing no silica (the liquid retention rate in a pressurized state housed in a battery case is lower than that of the retainer 3 between the electrodes), The same test was performed on the electrode of (b) (a battery in which the electrode group was wound with an electrolyte-soluble thin paper). After 10 minutes, the air pocket 7 was found to have an area of 20 to 50% of the area of the electrode surface. Was observed. This air pool 7
In the case of the conventional battery (d), 30% of the area of the electrode plate surface remained 30 minutes after the injection (FIG. 2). However, in the electrode plate of the product (a) of the present invention, the electrolyte solution permeated the entire surface of the electrode plate 10 minutes after the injection of the electrolyte solution, and no air pool was observed.

[0008]

[Table 1]

After assembling the battery (12 V, 60 Ah), a 5 HR discharge test at 25 ° C. was performed as an initial performance.
The product (a) of the present invention exhibited excellent discharge characteristics as compared with the batteries (b), (c) and (d) (FIG. 3). This is because the electrolyte is
Probably because the electrode group was penetrated efficiently in a short time and efficiently throughout the electrode group through the bag-shaped retainer in close contact with the electrode group, through the path from the center and the path from the outside. .

Next, let A be the liquid holding ratio of the bag-shaped retainer 4 (volume of liquid in the bag-shaped retainer / volume of the bag-shaped retainer) and B be the liquid holding ratio of the retainer 3 in the electrode plate group. When a battery was changed and a 5HR discharge test was performed, when A was smaller than B, the 5HR discharge test performance was good (FIG. 4). This is because a retainer wrapping the electrode group having a smaller liquid retention rate than the retainer 3 inside the electrode group prevents the electrolytic solution from rapidly permeating from the outside of the electrode group, and the electrolytic solution inside the electrode group. Is likely to move, and it is considered that the formation was sufficiently performed without generating air pockets on the electrode plate surfaces in the electrode plate group.

[0011]

Industrial Applicability According to the present invention, the injected electrolytic solution can be uniformly infiltrated into the center of the electrode plate surface of the electrode group in a short time, and stable battery performance can be improved. It is a great thing.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of the battery of the present invention.

FIG. 2 is an explanatory view of an air pool on an electrode plate surface.

FIG. 3 is a diagram showing a 5HR discharge test result of various batteries.

FIG. 4 is a graph showing the relationship between the liquid retention of a bag-shaped retainer according to the present invention and the results of a 5HR discharge test.

[Explanation of symbols]

 1: Positive electrode plate 2: Negative electrode plate 3: Retainer 4: Bag-shaped retainer 5: Battery case 6: Silica-added part 7: Air pocket

Claims (2)

[Claims] 1. A battery case comprising: an electrode plate group formed by assembling unformed positive and negative electrode plates via a retainer; and a bag-shaped retainer containing silica at a central portion of a surface facing the electrode plate surface. A sealed lead battery, wherein the sealed lead battery is housed in a container and filled with an electrolytic solution to form a battery case. 2. The sealed lead-acid battery according to claim 1, wherein the bag-shaped retainer has a lower liquid retention rate in a pressurized state housed in a battery case than a retainer between electrode plates.