JPH08124565A - Positive plate for lead-acid battery - Google Patents

Abstract

PURPOSE: To provide a positive plate for a lead-acid battery capable of suppressing elongation in upper/lateral directions of an expanded lattice. CONSTITUTION: A positive plate main unit 10, using an expanded lattice provided with not a vertical skeleton frame horizontally but a horizontal skeleton frame vertically, is used. In the positive plate main unit 10, of its four sides, a resin frame 11 of surrounding one side in the upper part and two sides in the side part is mounted. In the positive plate main unit 10, its height is formed 88 to 96% a length of the resin frame 11 positioned in the two sides in the side part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anode plate for a lead storage battery using an expanded grid.

[0002]

2. Description of the Related Art Conventionally, an expanded grid 1 used as a base for an anode plate for a lead storage battery has horizontal frames 1a and 1b at the top and bottom as shown in FIG. 5, but has no vertical frames at the left and right. The shape is such that the entire lattice is easily deformed. In the positive electrode plate for a lead storage battery using such an expanded grid 1, the upper end of the ear portion 2 projecting upward in the center of the horizontal frame 1a is fixed as a strap when forming the electrode plate group, The lower side will be fixed by the bottom of the battery case, and the deformation will occur on the left and right shoulders of the transverse frame 1a above the expanding lattice 1 as shown by the chain double-dashed line in FIG. When such deformation becomes large, the strap of the cathode plate comes into contact with the strap to cause a short circuit, resulting in an early life.

Therefore, as shown in FIG. 6, the height of the anode plate 3 is reduced by 8% on average from the height of the cathode plate 4,
There has been proposed a method of extending the life by providing a structure in which a margin 5 is provided in the downward direction (Japanese Utility Model Laid-Open No. 5-14458).
In addition, 6 is a strap in which the respective anode plates 3 are connected by their ears 2, 7 is a pole provided on the strap 6, 8 is a retainer that encloses the plate surface of the cathode plate 4, and 9 is these anode plates 3 , A cathode plate 4 and a retainer 8 are an electrode plate group.

[0004]

However, the cause of the trickle life is not only the short circuit with the cathode strap due to the expansion of the expand grating 1 described above, but also the fact that the expand grating 1 extends in the vertical and horizontal directions. There are factors that cause contact failure due to the substance coming off the lattice 1 and further the fall of the active material. The life due to this cause includes various factors such as the battery structure, the shape of the electrode plate, the strength of the active material, etc., which cannot be generally referred to, but often accounts for 50% or more.

That is, even if a means such as Japanese Utility Model Laid-Open No. 5-14458 is used, the problem of early life cannot be solved in all batteries.

An object of the present invention is to provide an anode plate for a lead storage battery which can suppress the upward and lateral expansions of the expanding grid.

[0007]

DISCLOSURE OF THE INVENTION The present invention is intended to improve an anode plate for a lead-acid battery having an anode plate body using an expanded grid having horizontal frames on the top and bottom but no vertical frames on the left and right. .

In the lead-acid battery anode plate according to the present invention, the anode plate body is provided with a resin frame that surrounds one side of the four sides and two sides of the side, and the anode plate body has a high height. Is 88 to 96% of the length of the resin frame located on the two sides of the side portion.

Further, in the positive electrode plate for a lead storage battery according to the present invention, the positive electrode plate main body is provided with a resin frame surrounding one upper side and two side sides of the four sides, and the positive electrode plate main body is provided with the resin frame. The height is an average of 8% less than the length of the resin frame located on the two sides of the side portion.

In these cases, the dimensional reduction of the anode plate body is the amount of extension of the anode plate body downward.

Further, it is preferable that each side of the resin frame has a U-shape, and the concave portions of the respective sides are fitted to the edge portion of the anode plate body.

Further, it is preferable that the resin frame is made of a liquid-permeable resin. The liquid permeable resin includes a liquid permeable foamed resin and a resin in which a large number of liquid permeable holes are mechanically formed.

Further, in the anode plate for a lead storage battery according to the present invention, the anode plate body is housed in a liquid-permeable resin case,
The liquid-permeable resin case is opened at its lower portion, and the height of the anode plate body is 88 to 96 times the height of the liquid-permeable resin case.
It is characterized by being%.

In the lead acid battery anode plate according to the present invention, the anode plate body is housed in a liquid-permeable resin case,
The liquid permeable resin case is opened at its lower part, and the height of the anode plate main body is reduced by an average of 8% from the height of the liquid permeable resin case.

[0015]

When the resin frame surrounding the one side and two sides of the upper side of the four sides of the anode plate main body using the expanded lattice is provided, the anode plate main body extends in the upper and both lateral directions. Is suppressed and the downward growth is concentrated. However, a sufficient stretch margin is provided in the lower part of the electrode plate, and excessive stress does not occur.

Further, the contact between the expanding lattice and the active material is kept longer than before by being held by the resin frame. Of course, the dropping of the active material is also suppressed.

Further, in the 45 ° C. trickle life test, the deformation of the expanding lattice at the end of life is 4 to 12% (average 8).
%), The amount of growth was 4
-12% (8% on average) is set. Therefore, the downward expansion of the anode plate body can be absorbed by such an expansion margin.

When each side of the resin frame is U-shaped and the recesses on each side are fitted and mounted on the edges of the anode plate body, the recesses on the two sides of the resin frame are used as guide grooves to form the anode plate body. Can be extended downwards.

Further, when the resin frame is made of a liquid-permeable resin such as a liquid-permeable foamed resin, it has the same functions as the conventional ones with respect to electrolyte holding and electrolyte diffusion, and there is no problem at all.

Further, as in the present invention, the main body of the anode plate is housed in the liquid-permeable resin case, the lower part of the liquid-permeable resin case is opened, and the height of the main body of the anode plate is set to the level of the liquid-permeable resin case. If the size is reduced by 88 to 96% of the height, or 8% on average from the height of the liquid-permeable resin case, the expansion of the anode plate body in the upper part and both lateral directions is suppressed and the downward expansion is prevented. It can be integrated, and moreover, a sufficient expansion margin is provided in the lower part of the electrode plate, so that it is possible to prevent excessive stress from being generated.

Further, the contact between the expanding lattice and the active material can be kept longer than before by pressing from the liquid-permeable resin case, and the falling of the active material can be suppressed.

If a liquid-permeable resin case is used, the retainer can be omitted.

From the above, a lead acid battery having a longer life than the conventional one can be obtained.

[0024]

EXAMPLE FIG. 1 (A (B) shows a first example of the lead-acid battery anode plate according to the present invention.

As shown in FIG. 5, the lead-acid battery anode plate of the present embodiment has an upper and lower horizontal frame 1a and 1b, but does not have a vertical frame on the left and right.
Has zero. A resin frame 11 is attached to the anode plate body 10 so as to surround one of the four sides and two sides of the side. The height of the anode plate body 10 is 88 to 96% of the length of the resin frame 11 located on the two sides of the side portion. Alternatively, the anode plate body 10 is dimensioned such that its height is reduced by 8% on average from the length of the resin frame 11 located on the two sides of the side portion. Each side of the resin frame 11 is U-shaped, and the recess 11 a is fitted to the edge of the anode plate body 10 to be mounted. The resin frame 11 is preferably made of a liquid-permeable resin, for example, a liquid-permeable foamed resin such as expanded polypropylene or expanded polyethylene. The reduction in size of the anode plate body 10 is due to the margin of downward extension of the anode plate body 10.
Becomes That is, the anode plate body 10 has two
The concave portion 11a of the resin frame 11 on the side can be used as a guide groove to extend downward. The ears 2 of the anode plate body 10 are
It penetrates through the resin frame 11 and is projected to the outside.

As described above, when the anode plate body 10 using the expanded grid 1 is provided with the resin frame 11 that surrounds one side and two sides of the four sides of the anode plate body 10, the anode plate body 10 is provided on the upper side and both lateral sides. Growth in the direction is suppressed, and the growth is concentrated in the downward direction. However, the extension plate 12 is sufficiently provided in the lower portion of the anode plate body 10, and excessive stress does not occur.

Furthermore, the contact between the expanding lattice 1 and the active material is held by the resin frame 11, so that the contact is maintained longer than before. Of course, the dropping of the active material is also suppressed.

Further, in the 45 ° C. trickle life test, the deformation of the expanded lattice 1 at the end of life is 4 to 12% (average 8).
%) Since it showed a growth of about 10
4 to 12% (average 8%). Therefore, the downward expansion of the anode plate body 10 can be absorbed by the expansion margin 12. FIG. 2 shows a state of the lead acid battery using the anode plate of the present invention when the lead battery has reached the end of its life. As is apparent from the figure, the downward expansion of the electrode plate body 10 is absorbed by the expansion margin 12 of the resin frame 11, and the electrode plate body 10 does not project outside the resin frame 11.

When each side of the resin frame 11 is U-shaped and the recesses 11a on each side are fitted and attached to the edge of the anode plate body 10, the recesses 11a on the two sides of the resin frame 11 are guided. The anode plate body 10 can be extended downward as a groove.

Further, when the resin frame 11 is made of a liquid-permeable resin such as a liquid-permeable foamed resin, it exhibits the same function as that of the conventional retainer with respect to the electrolyte retention and the electrolyte diffusion, and there is no problem at all.

From the above, a lead acid battery having a longer life than the conventional one was obtained.

Then, a lead storage battery A having an electrode plate group structure using the anode plate of the present invention, a lead storage battery B having a conventional electrode plate group which has not been improved at all, and an actual flat plate 5-1445.
A trickle life test of the lead storage battery C using the means of No. 8 was conducted. The result is shown in FIG. Life test condition is 45 ± 2
Continuously charged at 2.275V / cell in the gas phase at ℃, and once every 2 months 0.25 CA (FV = 1.7V / cell) in the gas phase at 25 ± 2 ℃
The capacity was confirmed at. All batteries are 7Ah-12V.

As is apparent from FIG. 3, the product A of the present invention
Has a longer trickle life than conventional products B and C.

FIG. 4 shows a second embodiment of the lead-acid battery anode plate according to the present invention.

In the lead-acid battery anode plate of this embodiment,
The anode plate body 10 is housed in a liquid-permeable resin case 13. The liquid-permeable resin case 13 has an opening 14 at its lower portion.
It is open throughout. The height of the anode plate body 10 is 88 to 96% of the height of the liquid permeable resin case 13 or is 8% smaller than the height of the liquid permeable resin case 13 on average. The liquid-permeable resin case 13 is made of liquid-permeable foamed resin such as expanded polypropylene or expanded polyethylene.

Thus, the anode plate body 10 is housed in the liquid-permeable resin case 13, the lower portion of the liquid-permeable resin case 13 is opened, and the height of the anode plate body 10 is adjusted to the liquid-permeable resin case 1.
3 to 88% to 96% of the height, or an average of 8% less than the height of the liquid permeable resin case 13, to suppress the extension of the anode plate body 10 in the upper part and both lateral directions. Therefore, it is possible to concentrate on the downward expansion, and furthermore, the expansion margin is sufficiently provided in the lower part of the electrode plate, and it is possible to prevent the occurrence of excessive stress.

Further, the contact between the expanding lattice and the active material can be kept longer than before by pressing from the liquid-permeable resin case 13, and the active material can be prevented from falling off.

If the liquid-permeable resin case 13 is used, use of the retainer can be omitted.

Further, when the opening 14 is provided in the lower portion of the liquid-permeable resin case 13, the anode plate body 10 can be housed in the liquid-permeable resin case 13 through the opening 14.

[0040]

As described above, according to the positive electrode plate for a lead storage battery of the present invention, the following excellent effects can be obtained.

According to the present invention, an anode plate main body using an expanded grid having horizontal frames on the upper and lower sides but no vertical frames on the left and right sides is provided with a resin frame surrounding one upper side and two sides of the four sides. Since the anode plate main body is provided with the above, the expansion in the upper and lateral directions is suppressed, and the expansion in the downward direction can be concentrated. However, a sufficient extension margin is provided in the lower part of the electrode plate body, and it is possible to prevent excessive stress from being generated in the electrode plate body.

Further, the contact between the expanding lattice and the active material can be kept longer than in the conventional case because it is held by the resin frame, and the active material can be prevented from falling off.

In addition, an extension margin of 4 to 12 is provided at the bottom of the electrode plate body.
% (On average 8%), the downward expansion of the anode plate body can be reliably absorbed.

When each side of the resin frame is U-shaped and the recesses on each side are fitted and mounted on the edge of the anode plate body, the recesses on the two sides on the side of the resin frame serve as guide grooves. The plate body can be extended downward.

In the present invention, the anode plate body is housed in the liquid-permeable resin case, and the lower part of the liquid-permeable resin case is opened.
The height of the main body of the anode plate is 88 to the height of the liquid-permeable resin case.
Since the size is 96% or the average size is reduced by 8% from the height of the liquid-permeable resin case, the expansion of the anode plate body in the upper and both lateral directions is suppressed and the downward expansion is concentrated. You can
Moreover, a sufficient expansion margin is provided at the lower part of the electrode plate to prevent excessive stress from being generated.

Further, the contact between the expanding lattice and the active material can be kept longer than before by pressing from the liquid-permeable resin case, and the active material can be prevented from falling off.

If a liquid-permeable resin case is used, use of the retainer can be omitted.

As described above, according to the positive electrode plate for a lead storage battery of the present invention, a lead storage battery battery having a longer life than ever can be obtained.

[Brief description of drawings]

1A and 1B are a longitudinal sectional view and a perspective view of a first embodiment of an anode plate for a lead storage battery according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a state of a lead storage battery using the anode plate of the present embodiment when it reaches the end of its life.

FIG. 3 is a lead-acid battery A having an electrode plate group structure using an anode plate of the present embodiment, a lead-acid battery B having a conventional electrode plate group that has not been improved at all, and a utility model No. 5-14458. It is a figure which shows the result of the trickle life test of the lead acid battery C which used the means.

FIG. 4 is a partially cutaway perspective view of a second embodiment of a lead storage battery anode plate according to the present invention.

FIG. 5 is a front view showing an example of an expanding lattice.

FIG. 6 is a vertical sectional view showing a structure of an electrode plate group shown in Japanese Utility Model Laid-Open No. 5-14458.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Expanding lattice 1a, 1b Transverse frame 2 Ear part 3 Anode plate 4 Cathode plate 5 Stretching margin 6 Strap 7 Pole pole 8 Retainer 9 Electrode plate group 10 Anode plate body 11 Resin frame 11a Recess 12 Growing space 13 Liquid-permeable resin case 14 openings

Claims (6)

[Claims] 1. A positive electrode plate for a lead storage battery, comprising an anode plate body using an expanded grid having vertical frame members on the upper and lower sides but no vertical frame members on the left and right sides, wherein the anode plate member is one of the four sides of the upper side. And a resin frame surrounding two sides of the side part, and the height of the anode plate main body is 88 to the length of the resin frame located on the two sides of the side part.
Anode plate for lead acid battery characterized by being 96%. 2. A positive electrode plate for a lead storage battery, which has an anode plate body using an expanded grid having upper and lower horizontal frame parts but no vertical frame parts on the left and right sides, wherein the positive electrode plate body is one of the four upper sides. And a resin frame surrounding the two sides of the side part, and the height of the anode plate body is reduced by an average of 8% from the length of the resin frame located on the two sides of the side part. An anode plate for a lead storage battery, which is characterized in that 3. The resin frame has a U-shape on each side thereof, and is mounted by fitting a recessed part on each side to an edge of the anode plate body. Or the positive electrode plate for a lead storage battery according to 2. 4. The anode plate for a lead storage battery according to claim 1, wherein the resin frame is made of a liquid-permeable resin. 5. A positive electrode plate for a lead storage battery, which has an anode plate body using an expanded grid having upper and lower horizontal frame parts but no vertical frame parts on the left and right sides, wherein the positive electrode plate body is housed in a liquid-permeable resin case. The lower portion of the liquid permeable resin case is opened, and the height of the positive electrode plate main body is 88 to 96% of the height of the liquid permeable resin case. . 6. A positive electrode plate for a lead storage battery, which has an anode plate body using an expanded lattice having upper and lower horizontal frame members but no vertical frame members on the left and right sides, wherein the anode plate member is housed in a liquid-permeable resin case. The lower portion of the liquid permeable resin case is opened, and the height of the anode plate body is 8% on average of the height of the liquid permeable resin case.
Anode plate for lead-acid battery characterized by having reduced dimensions.