JP3368587B2 - Electrode for sealed lead-acid battery and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed lead-acid battery electrode plate and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a sealed lead-acid battery has a structure in which a retainer is arranged between a positive electrode plate and a negative electrode plate. In this case, the electrode plate surface is not flat but rough.

Further, in order to prevent the active material of the electrode plate from falling off during the battery manufacturing process, a protective body is integrally attached to the surface after filling the active material, and the electrode plate with the protective body is used to produce lead. Assembling the storage battery was done. That is, when a punched or expanded sheet of a lead alloy sheet is used as a lattice body, the lattice body is easily deformed, so that the filled active material is likely to fall off and a protective body may be attached. It has become an effective means.

[0004]

However, in the conventional electrode plate, since the electrode plate surface is not flat but rough, the group pressure is not constant and the adhesion between the electrode plate and the retainer is poor. There was a problem. For this reason, the amount of gas generated during charging is large and the amount of charge is insufficient, and the gap between the electrode plate and the retainer causes uneven charge-discharge reaction distribution. The self-discharge progresses preferentially in the areas where there are few, and there are problems in cycle life and leaving performance.

Further, when an expanded lattice is used as the lattice, the weight energy density is improved, but since there is no lattice at the end of the electrode plate, the active material may come out of the active material drop-out prevention body, resulting in a short circuit. there were.

An object of the present invention is to provide an electrode plate for a sealed lead-acid battery which can improve the adhesion between the electrode plate and the retainer, and a method for manufacturing the electrode plate.

[0007]

The means of the present invention for achieving the above object will be described below.

In the electrode plate for a sealed lead-acid battery according to claim 1, a retainer that also serves as an active material dropout prevention body is integrally attached to both surfaces of the electrode plate body, and at least the active material dropout prevention body and retainer is provided. An active material is retained on the side facing the electrode plate body, and the active material of the retainer for active material dropout prevention body and the active material of the electrode plate body are bonded or adhered to each other. To do.

According to a second aspect of the present invention, there is provided the electrode plate for a sealed lead-acid battery according to the first aspect, wherein the retainers serving as active material detachment preventive bodies on both surfaces of the electrode plate body are provided at the end portions of the electrode plate body. It is characterized in that the retainers that also serve as active material dropout preventive bodies are in close contact with each other and the electrode plate body is wrapped.

According to a third aspect of the present invention, there is provided a method of manufacturing a sealed lead-acid battery electrode plate, wherein a slurry-like paste for an active material is applied in advance to a retainer that also serves as an active material dropout prevention body, and then the paste for the active material is applied. It is characterized in that the retainer for preventing the active material from dropping is applied to both surfaces of the electrode plate body.

[0011]

As in the case of the sealed lead-acid battery electrode plate according to claim 1, the active material dropout preventive body / retainer is integrally attached to both surfaces of the electrode plate body, and the active material dropout preventive body / retainer is attached to the retainer. At least hold the active material on the side facing the electrode plate body,
When the active material of the retainer also serving as the active material dropout prevention body and the active material of the electrode plate body are bonded or brought into close contact with each other, the adhesion between the electrode plate body and the retainer also serving as the active material dropout prevention body is improved. this
Therefore, the lattice is filled with the active material in a uniform thickness.
Moreover, the adhesion of the retainer to the surface of this active material is good.
A preferable sealed lead-acid battery electrode plate can be obtained. As a result, the amount of gas generated during charging can be suppressed, shortage of charging can be eliminated, the reaction distribution during charging and discharging can be made uniform, and cycle life characteristics can be improved. In addition, since it is difficult for lead sulfate to form at the interface between the electrode plate body and the retainer that also serves as the active material dropout prevention body, the self-discharge characteristic is improved.

As in the sealed lead-acid battery electrode plate according to the second aspect, the retainers for active material drop-out prevention members, which are attached to both surfaces of the electrode plate body, are closely attached to each other at the ends of the electrode plate body. When the electrode plate main body is wrapped around the electrode plate body, the active material does not drop off at the end of the electrode plate, and a short circuit can be prevented.

When the electrode plate is formed as in claim 3 ,
Adhesion between the electrode plate body and the retainer that also serves as the active material dropout prevention body
It is possible to easily manufacture an electrode plate with a retainer that also serves as an improved active material dropout preventer.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows an example of an electrode plate group using the electrode plate battery for a sealed lead storage battery according to the present invention. The electrode plate group is composed of a positive electrode plate 1, a negative electrode plate 2 and a retainer 3 interposed therebetween.

The positive electrode plate 1 has a retainer 5 also serving as an active material dropout prevention body, which is integrally attached to both surfaces of the positive electrode plate body 4, and the active material dropout prevention body also serves as a side facing the positive electrode plate body 4. Holds the positive electrode active material 6. The positive electrode active material 6 of the retainer 5 also serving as the active material dropout prevention body and the positive electrode active material of the positive electrode plate body 4 are bonded or adhered to each other.

In the negative electrode plate 2, a retainer 8 also serving as an active material dropout prevention body is attached to both surfaces of the negative electrode plate body 7, and the active material fallout prevention body also serves as a side facing the negative electrode plate body 7. Holds the negative electrode active material 9. The negative electrode active material 9 and the negative plate main body 7 of the retainer 8 also serving as the active material dropout preventer.
Is bonded or adhered to the negative electrode active material.

In this case, glass fibers or the like are used as the retainers 5 and 8 also serving as the active material dropout preventive body.

As the retainer 3, one having a size larger than each of the electrode plates 1 and 2 is used to prevent short circuit.

Next, an example of a method of manufacturing the positive electrode plate 1 will be described. The positive electrode active material paste is made into a slurry with a viscosity adjusting agent and applied to the inner surface of the retainer 5 that also serves as the active material dropout prevention body, and is attached to the positive electrode plate body 4 in an unformed state. In the portion, the retainer 5 also serving as the active material dropout preventive body is closely adhered to each other to wrap the positive electrode plate body 4. By forming in this state, the positive electrode active material of the positive electrode plate main body 4 and the positive electrode active material in the retainer 5 that also serves as the active material dropout prevention body are bonded. Here, when the positive electrode active material paste is included in advance in the retainer 5 that also serves as the active material dropout prevention body, the paste viscosity is 10,0 to 50,000 cps in the range of 2,000 cps to 50,000 cps.
Lower than 00cps is preferable.

The negative electrode plate 2 can be manufactured in the same manner as the positive electrode plate 1.

Further, at the time of manufacturing each electrode plate main body, the slurry-like paste for active material filled in the lattice may be included in the retainer for active material falling prevention body also attached to the surface thereof. That is, a grid-like body is filled with a slurry-like paste for active material to form an electrode plate body, and retainers for both active material dropout prevention body and active material fallout prevention body are attached to both surfaces of the electrode plate body to retain the active material dropout prevention body and retainer. To contain the slurry-form paste for active material. In this case, the paste viscosity is 2.00
A higher value is preferable in the range from 0 cps to 50,000 cps.

Further, when the electrode plate is continuously manufactured by using the expanded lattice, the retainers also serving as the active material dropout preventive bodies attached to the front and back of the electrode plate body when cut are combined and included in the retainer. was slurries like active material paste becomes a binder, it can be brought into close contact with the retainer together.

Then, the positive electrode plate 1 according to the conventional product and the product of the present invention
2V-1.5 Ah type battery composed of 1 sheet, 1 sheet of negative electrode,
Fig. 2 shows the results of investigating the amount of gas generated at the time of charging at 2.47 V / cell and 2.5 V / cell at 1 CA cut for 2 hours.
Shown in.

Discharge conditions: 1 A discharge, final voltage 1.74
Fig. 3 shows the result of a charge / discharge cycle test under V, charging condition 2.45V / cell, 0.3 CA cut.

As a result, according to the present invention, it was found that the amount of gas generated during charging was suppressed, the capacity was increased, and the cycle life was also improved.

Further, Table 1 shows the result of discharging the battery at 1 A, measuring the initial capacity, charging the battery, leaving it at 25 ° C. for one year, and measuring the remaining capacity.

[0028]

[Table 1] This revealed that the product of the present invention has improved self-discharge characteristics as compared with the conventional product.

Next, the thickness between the positive electrode active material 6 layer and the negative electrode active material 9 layer contained in the retainers 5 and 8 also serving as the active material dropout preventive body between the positive electrode plate 1 and the negative electrode plate 2. 4 shows the number of life cycles when various values were changed. As a result, when the thickness between the active material layers is less than 0.7 mm, the number of life cycles decreases. This is probably because a short circuit occurred in the retainer as the cycle proceeded. Therefore, it is desirable that the thickness between the active material layers in the retainer is 0.7 mm or more.

When the retainer was brought into close contact with the end of the electrode plate body to prevent the active material of the electrode plate body from being exposed, the exposed battery had a short circuit of 3%, whereas the short circuit was 0%.

The retainer 5, which also serves as the active material dropout preventive body,
When the thickness of 8 is large, the retainer 3 can be omitted from the electrode plate group.

[0032]

As described above, according to the sealed lead-acid battery electrode plate and the method of manufacturing the same according to the present invention, the following effects can be obtained.

In the sealed lead-acid battery electrode plate according to the present invention, a retainer also serving as an active material dropout prevention member is integrally attached to both surfaces of the electrode plate body, and at least the active material dropout prevention member retainer is at least polar. Hold the active material on the side facing the plate body,
Since the active material of the retainer also serving as the active material dropout prevention member and the active material of the electrode plate main body are bonded or adhered to each other, the adhesion between the electrode plate main body and the retainer also serving as the active material dropout prevention member can be improved. . For this reason, the active material is almost evenly distributed in the lattice.
Retaining the surface of the active material filled with a large thickness
To obtain a sealed lead-acid battery electrode plate with good adhesion to
You can According to sealed lead-acid battery using the electrode plate of the present invention, it is possible to suppress the amount of gas generated during charging, it is possible to eliminate insufficient charging, also uniform reaction distribution during charging and discharging The cycle life characteristics can be improved. In addition, since it is difficult for lead sulfate to be generated in the electrode plate main body and the retainer that also serves as the active material dropout preventer, the self-discharge characteristics can be improved.

In the electrode plate for a sealed lead-acid battery according to claim 2, the retainers which also serve as active material detachment preventive bodies attached to both surfaces of the electrode plate body are closely adhered to each other at the ends of the electrode plate body. Since the electrode plate body is wrapped, the active material does not drop off at the end of the electrode plate, and a short circuit can be prevented.

When the electrode plate is formed as in claim 3 ,
Adhesion between the electrode plate body and the retainer that also serves as the active material dropout prevention body
It is possible to easily manufacture an electrode plate with a retainer that also serves as an improved active material dropout preventer.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a plate group using a sealed lead-acid battery plate according to the present invention.

FIG. 2 is a comparison diagram of gas generation amounts during charging of the product of the present invention and the conventional product.

FIG. 3 is a comparative diagram showing the charge / discharge cycle life of the product of the present invention and the conventional product.

FIG. 4 is a diagram showing the thickness between active material layers in a retainer that also serves as an active material dropout prevention body and the number of life cycles thereof.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Positive electrode plate, 2 ... Negative electrode plate, 3 ... Retainer, 4 ... Positive electrode plate body, 5 ... Retainer also serving as active material dropout preventer, 6 ... Positive electrode active material, 7 ... Negative electrode plate body, 8 ... Active material dropout preventer Retainer, 9 ... Negative electrode active material.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuru Iagaki 1-1-1, Nishishinjuku, Shinjuku-ku, Tokyo Inside Shin-Kobe Electric Co., Ltd. (72) Shinji Chino 2-1-1, Nishishinjuku, Shinjuku-ku, Tokyo No. 1 in Shin-Kobe Electric Machinery Co., Ltd. (56) Reference JP-A-1-195674 (JP, A) JP-A-48-101525 (JP, A) JP-A-62-281264 (JP, A) (58) Survey Areas (Int.Cl. ⁷ , DB name) H01M 4/14 H01M 4/20

Claims (3)

(57) [Claims] 1. A retainer that also serves as an active material dropout prevention body is integrally attached to both surfaces of the electrode plate body, and the active material is retained on at least the side facing the electrode plate body in the retainer that also serves as an active material dropout prevention body. An electrode plate for a sealed lead-acid battery, characterized in that the active material of the retainer also serving as the active material dropout prevention member and the active material of the electrode plate body are bonded or adhered to each other. 2. The active material drop-preventing body / retainers on both surfaces of the electrode plate body are such that the active material drop-preventing body / retainers are in close contact with each other at the ends of the electrode plate body. The electrode plate for a sealed lead-acid battery according to claim 1, wherein the electrode plate is enclosed. 3. A retainer that also serves as an active material dropout prevention body is previously coated with a slurry-like paste for active material, and then the retainer that also serves as an active material dropout prevention body coated with the active material paste is provided on both surfaces of the electrode plate body. A method for manufacturing an electrode plate for a sealed lead storage battery, which is characterized in that the electrode plate is attached to.