JPH0541060U - Anode plate for lead acid battery - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain an anode plate for a lead storage battery that can extend the life of the lead storage battery. [Structure] A grid 1 made of a lead alloy is filled with an active material to form an active material layer 2. The ratio (A / B) of the total surface area A of the grid body 1 excluding the ear portions 1a and the area B of the region where the active material layer is formed is 0.75 or more and 2 or less. The number of longitudinal bones 1c1 of the inner bones 1c of the lattice 1 is at least six.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an anode plate for a lead storage battery.

[0002]

[Prior Art]

 As shown in FIG. 6, the most common anode plate for a lead storage battery has an active material layer 2 formed by filling a grid body 1 made of lead or a lead alloy with an anode active material. The lattice 1 is composed of an ear portion 1a, a frame bone 1b, an inner bone 1c and a foot 1d. The active material layer 2 is formed by filling a grid-like portion formed by the frame bones 1b and the inner bones 1c of the cast grid body 1 with an anode active material.

The life of a lead storage battery using such an anode plate tends to be governed by the life of the anode plate, and various techniques for extending the life of the anode plate have been conventionally proposed. Many of the techniques proposed so far include adding appropriate components to the lattice material to suppress the extension of the lattice, and devising the shape of the bone of the lattice to remove the active material. It was a restraint.

[0004]

[Problems to be solved by the device]

 In recent years, the demand for further extending the life of lead acid batteries has been increasing. However, it is difficult to meet this demand with only the technologies that have been proposed so far, and it is strongly desired to propose new technologies.

An object of the present invention is to propose a new technique for extending the life of a lead acid battery positive electrode plate.

[0006]

[Means for Solving the Problems]

 The present invention is directed to an anode plate for a lead storage battery in which a grid body made of a lead alloy is filled with an active material to form an active material layer.

In the invention of claim 1, the ratio (A / B) of the total surface area A of the portion excluding the ear portion of the lattice and the area B of the region where the active material layer is formed is 0.75 or more and 2 or less. And

According to the second aspect of the invention, the ratio (A / B) of the total surface area A of the portion excluding the ear portion of the lattice and the area B of the region where the active material layer is formed is 0.75 or more and 2 or less. And the number of longitudinal bones of the inner bones of the lattice is at least six.

[0009]

[Action]

 Based on the idea that the relationship between the surface area of the grid of the anode plate and the size of the active material layer may affect the life of the battery, the inventor proceeded with the research and set the surface area of the grid to an appropriate range. By doing so, we have found that the life of the anode plate (life of the storage battery) can be extended. Looking at the relationship between the surface area of the lattice body of the conventional anode plate and the size of the active material layer, in the example of the conventional lattice body shown in FIG. 6, the surface area of the lattice body (entire portion excluding the ear portion 1a is The surface area) is A, and the size of the active material layer 2 is the area of the region where the active material layer 2 is formed (the product of the lateral inner dimension d of the lattice frame frame 1b and the longitudinal inner dimension h). When the area ratio (A / B) of both was examined as B, the value was about 0.7. When the area ratios of other cast grids used for other known anode plates were examined, most of them were 0.7 or less or slightly larger than 0.7.

The inventor has found that the area ratio (A / B) between the total surface area A of the grid body excluding the ears and the area B of the area where the active material layer is formed [hereinafter, simply referred to as the area ratio (A / B). ] Various lead-acid batteries were manufactured by using various anode plates, and the results of measuring the life of each lead-acid battery revealed the following. If the area ratio (A / B) is 0.75 or more and 2 or less, the life of the lead storage battery can be extended compared to the conventional one. If the area ratio (A / B) is less than 0.75, the active material is likely to drop from the lattice as in the conventional case, and the area ratio (A / B) is 2. It has been found that when it exceeds 0, the anode active material becomes finer and discharge becomes impossible.

Further, the inventor examined whether or not the number of longitudinal bones of the internal bones of the lattice body affects the life in combination with the above area ratio, and found that the number of longitudinal bones is at least six. Was found to be preferable. If the number of vertical bones is less than 6, there is a problem that the current collecting property is lowered.

[0012]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view of an embodiment of an anode plate for a lead storage battery according to the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BB of FIG. Is. In these figures, 1 is a lattice made of a lead alloy, and 2 is an active material layer formed by using an active material paste containing lead oxide, water and dilute sulfuric acid as main components. The lattice body 1 is composed of an ear portion 1a, a frame bone 1b, an inner bone 1c, and a foot 1d. As the lead alloy forming the lattice 1, lead alloys containing various components can be used. The inner bone 1c is configured such that a plurality of longitudinal bones 1c1 having the same shape and the same size of cross section and a plurality of horizontal bones 1c2 having the same shape and the same size of cross section are orthogonal to each other. , The vertical bones 1c1 ... And the horizontal bones 1c2 ... Are arranged at substantially equal intervals. In particular, when the lattice body 1 is formed, it is preferable to set the number of the longitudinal bones 1c1 of the internal bones 1c to be at least six. The active material layer 2 is formed in the region of the lattice-shaped portion formed by the inner bone 1c, and the total surface area A of the lattice body 1 excluding the ears 1a and the area of the region where the active material layer is formed The area ratio (A / B) of B (area approximately equal to the product of the lateral inner dimension d of the frame bone 1b and the longitudinal inner dimension h) is 0.75 or more and 2 or less. .

Next, in order to investigate the characteristics of the lead-acid battery anode plate of the embodiment of the present invention, the area ratio (A / Batteries different from each other in B) were used to prepare anode plates, and life tests were conducted. Samples 3 to 8 are lattices used in the examples of the present invention in which the area ratio (A / B) is in the range of 0.75 or more and 2 or less. Samples 1 and 2 are grids used for a conventional anode plate having an area ratio (A / B) of 0.4 or more and 0.7 or less, and Sample 9 has an area ratio (A / B) of 2. 4 is a grid used in the comparative anode plate of No. 4. In addition, Table 1 shows the weight per piece of the cast lattices of each of Samples 1 to 9, the height and the lateral dimension of the lattice, the total number of internal bones of the lattice (the number of longitudinal bones + the number of transverse bones). ), And the area ratio (A / B) of the anode plate.

[0015]

[Table 1]

First, samples 1 to 9 were formed of a lead alloy of 2.7% Sb-0.25% As, and the test was carried out on those in which the number of longitudinal bones of the internal bone 1c of each lattice was at least 6. went. In Samples 1 to 9, the number of longitudinal bones of the internal bone 1c is 6,8,8,9,8,8,10,10,12.

In the life test, a single-cell lead acid battery having a 5 HR capacity of 48 AH was prepared using each sample 1 to 9 and a sulfuric acid solution (electrolytic solution) having a specific gravity of 1.28, and each lead acid battery was discharged. Charging / discharging was repeated with 25 A8 minutes and 13.8V15 minutes for charging as one cycle, and discharge was performed at 300 A every 480 cycles. Then, the number of cycles at the time when the voltage reached 7.2 V at the 30th second was used as the number of lifetimes for the measurement. FIG. 4 shows the measurement results. In this figure, the vertical axis shows the ratio of the number of lifetimes at 75 ° C. with the conventional product as 100, and the horizontal axis shows the area ratio (A / B) of the anode plate.

As shown in FIG. 4, when the area ratio (A / B) is less than 0.75, the life is greatly reduced, and even when the area ratio (A / B) is more than 2.0, the life is significantly reduced. It can be seen that there is a convex relationship between the ratio of the number of life tests and the area ratio (A / B). This is because when the area ratio (A / B) is less than 0.75, the active material is likely to fall off the lattice, and when the area ratio (A / B) is more than 2.0, the anode active material is miniaturized to cause discharge. It is thought that it will not be possible. In the battery using the anode plate of the embodiment of the present invention having the area ratio (A / B) of 0.75 or more and 2.0 or less, both the corrosion deterioration of the lattice body and the deterioration of the active material occur. It reached the end of its life.

Next, using a lead alloy of 1.5% Sb-0.2% AS, a grid body having the same specifications as the grid body shown in Table 1 was prepared, and an anode plate was formed using this grid body. The same battery as in the above example was manufactured, and a charge / discharge test was performed under the same conditions as the test shown in FIG. The number of internal bones of the anode plate used in this test was the same as that shown in Table 1, and the number of longitudinal bones was also the same. FIG. 5 is a diagram showing test results. From FIG. 5, it can be seen that even if the alloy composition of the lattice is changed, the life can be extended by setting the area ratio (A / B) to 1 or more and 2 or less. A similar test was conducted on an anode plate composed of a Pb-Ca alloy lattice containing no antimony as an alloy composition, but it was confirmed that the same effect as this test could be obtained.

[0020]

[Effect of the device]

 According to the present invention, it is possible to obtain an anode plate for a lead storage battery, which can prolong the life of the lead storage battery.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a ratio of the number of life tests of each battery to an area ratio (A / B)
It is a figure which shows the relationship with.

FIG. 5: Ratio of life test times and area ratio (A / B) of each battery
It is a figure which shows the relationship with.

FIG. 6 is a plan view of an anode plate for a lead storage battery.

[Explanation of symbols]

1 ... Lattice body, 1c ... Internal bone, vertical bone ... 1c1, transverse bone ... 1c2
2 ... Active material layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomo Morii Shin 1-1 Shinjuku Toden Electric Co., Ltd. Shinjuku-ku, Tokyo

Claims (2)

[Scope of utility model registration request] 1. A positive electrode plate for a lead storage battery, comprising a grid body made of a lead alloy filled with an active material to form an active material layer. The ratio (A / B) to the area B of the region where the active material layer is formed is 0.
An anode plate for a lead storage battery, characterized in that it is 75 or more and 2 or less. 2. A positive electrode plate for a lead storage battery, comprising a grid body made of a lead alloy filled with an active material to form an active material layer, the total surface area A of the grid body excluding the ears The ratio (A / B) to the area B of the region where the active material layer is formed is 0.
75 or more and 2 or less, and the number of longitudinal bones of the inner bones of the lattice body is at least 6, and the positive electrode plate for a lead storage battery.