JPH1154125A - Lattice for lead acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery which hardly elongates and has excellent service life performance even when a punched lattice is used by forming at least a part of a void part formed by punching in a triangular shape, and setting a rate of the area of this region to the whole area of a lattice void to a specific range. SOLUTION: An ordinary punched lattice (a) is easily deformed when stress is applied since a shape of a part surrounded by a sash bar formed by unfolding is a quadrangular shape, on the one hand, lattices (b and c) having a triangular shape are hardly deformed, and a deformation degree reduces as a rate of a triangular part increases. In an actual case, when the area A of a region where a shape of the part surrounded by the sash bar formed by unfolding becomes a triangular shape is set to (0.1<=A/S<=1.0) to the whole area S of a lattice void, deformation of a plate can be restrained, and since elongation reduces, and capacitive reduction is reduced, and battery performance is also improved thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a lead storage battery.

[0002]

2. Description of the Related Art Casting methods, expanding methods, and punching methods have been used as methods for producing a grid for a lead-acid battery.

[0003] Although the casting method has a feature that a free lattice shape can be produced, the productivity is inferior due to the batch method, and crystal grain boundaries and casting defects occur in the crystal structure, so that abnormal corrosion easily occurs during use of the battery. It has the disadvantage that

[0004] On the other hand, in the expanding method, a continuous lead alloy sheet or the like is developed to form a lattice. Continuous production is possible, and thus the productivity is very excellent. However, the lattice shape is limited. Has the disadvantage that it is easily deformed because it is made by deployment.

[0005] Another punching method is to form a punched grid by punching a rolled lead alloy sheet or the like.
It has the features of being capable of continuous production, having high productivity, being able to freely design a lattice shape, and being able to obtain a lattice free of crystal grain boundaries and casting defects as seen in a cast lattice by using a rolled sheet.

[0006]

However, when a punched grid is used for the positive electrode plate, lead (Pb) on the grid surface changes to lead dioxide (PbO ₂ ) having a large volume, and thus a tensile stress is applied to the grid. As a result, the lattice is easily stretched and deformed.

[0007] The cast grid has a structure in which the thickness of the grid is partially changed to make it difficult to elongate. However, in the case of a punched grid, it is difficult to partially change the thickness.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its gist is to provide a grid for a lead-acid battery manufactured by punching a rolled sheet made of a lead alloy. At least a part of the void portion to be formed has a triangular shape, and the area A of the region is 0.1 ≦ A / S ≦ 1.0 with respect to the total area S of the lattice void portion. .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.

First, a lead (Pb) -0.07% calcium (Ca) -1.5% tin (Sn) alloy sheet was prepared by the following method. A lead alloy slab having a thickness of 20 mm was produced by a drum type continuous casting machine, and this was sequentially reduced by an eight-stage rolling roller to finally obtain a rolled sheet having a thickness of 2 mm. At the time of casting, 0.01% of aluminum (Al) was added to the alloy. The addition of Al to the alloy is for preventing the oxidation of Ca during casting.

Next, these rolled sheets were processed as shown in FIG. 1 and continuously filled with a paste to produce an electrode plate. FIG. 1A shows a conventional product in which a punched portion is square.
(B) is a product of the present invention in which a part is triangular, and (c) is a lattice of the present invention in which all punched portions are triangular.

[0012] Since the shape of the void portion formed by punching in a normal punched grid is quadrangular, it is easily deformed in the vertical and horizontal directions when stress is applied.
FIG. 2 shows the deformation of the square lattice when a lateral stress is applied. If this shape is triangular, deformation in the vertical and horizontal directions can be suppressed structurally.

FIG. 3 shows the deformation when a lateral stress is applied to the triangular grid, but the deformation is much smaller than that of the square grid. That is, in various buildings and bridge piers, the structural members are used in combination with triangles in order to reduce deformation, and this idea is applied to a punched grid.

In order to confirm the effect of suppressing the deformation of the punched grid, a test was performed by changing the ratio of the area A of the triangular portion to the area S of the entire grid void.

In accordance with a conventional method, a retainer type sealed lead battery (12
V, 30 Ah) at 60 ° C. It was subjected to a constant voltage overcharge test at 3 V for one year. The test results are shown in Table 1.

In the conventional product, the expansion of the lattice was large, so that the capacity reduction was large. In the product of the present invention, the elongation was small and the capacity reduction was small.

[0017]

[Table 1] Since the shape of the portion surrounded by the ridge formed by expansion is a square shape in a normal punched grid, it is easily deformed in the vertical and horizontal directions when stress is applied, whereas the product of the present invention is Since this shape was a triangle, the deformation in the vertical direction and the horizontal direction was structurally suppressed. This deformation suppression effect is apparent from the fact that the degree of deformation tends to decrease as the ratio of the triangular portions increases.

From these results, it can be seen that the area A of the region where the shape of the portion surrounded by the ridge formed by expansion is triangular is 0.1 ≦ A / S ≦ 1 with respect to the total area S of the lattice gap. By doing so, it was found that the deformation of the electrode plate could be suppressed, and the battery performance also improved.

[0019]

As described in detail above, according to the present invention, even when a punched grid is used, a battery having a small life and excellent life performance can be obtained, and its industrial value is extremely large. .

[Brief description of the drawings]

FIG. 1a is a diagram showing an example of a conventional punched grating in which the punched portions are square.

FIG. 1b is a diagram showing an example of a punched grating of the present invention in which a part of the punched portion is triangular.

FIG. 7c is a view showing an example of a punched grating of the present invention in which all punched portions are triangular.

FIG. 2 is a diagram showing lattice deformation when a lateral stress is applied to a square lattice.

FIG. 3 is a diagram showing lattice deformation when a lateral stress is applied to a triangular lattice.

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[Procedure amendment]

[Submission date] October 30, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1A is a view showing an example of a conventional punched grating in which a punched portion is square. b is a diagram showing an example of a punched grating of the present invention in which a part of the punched portion is triangular. c is a diagram showing an example of a punched grating of the present invention in which all punched portions are triangular.

FIG. 2 is a diagram showing lattice deformation when a lateral stress is applied to a square lattice.

FIG. 3 is a diagram showing lattice deformation when a lateral stress is applied to a triangular lattice.

Claims (1)

[Claims] 1. A lead storage battery lattice produced by stamping a rolled sheet made of a lead alloy, wherein at least a part of a void portion formed by stamping is triangular,
A grid for a lead-acid battery, wherein the area A of the region is 0.1 ≦ A / S ≦ 1.0 with respect to the total area S of the grid gap.