JPH0320016B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to the structure of a lead-acid battery plate that does not use antimony. In recent years, as the movement toward maintenance-free batteries has grown, antimony is no longer used in the lattice alloy of lead batteries in many cases. In most cases lead-calcium alloys are used. However, when this alloy is used for the positive electrode grid, the grid stretches during use, resulting in the battery case being destroyed or the terminal being lifted from the lid, resulting in the dilute sulfuric acid electrolyte flowing out from the battery. may damage the equipment. The grid generally used for lead-acid batteries has the shape shown in Figure 1, with a thick outer frame 1 consisting of a frame called a picture frame surrounding the grid, and the inside of the grid divided into small sections by many thin inner bars 2. It is being Outer arm 1
is thick to facilitate the handling of the grid, and the inner rail 2 is thin to facilitate filling with paste. On the other hand, the reason why the lattice stretches is that a corrosion layer is formed around or inside the lattice due to charging and discharging during battery use. This corrosion layer is caused by the conversion of lead in the lattice into lead dioxide and lead sulfate.
The volume change is approximately 1.4 times from lead to lead dioxide, and approximately 2.7 times from lead to lead sulfate.
This creates a large stress in the corroded layer, which tends to stretch the lattice. A corroded layer is formed on each inner beam, and stress is generated in each layer.
In this case, since the horizontal beams are generally thinner and larger in number than the vertical beams, the surface area of the beams is larger, and the stress generated is larger in the horizontal direction than in the vertical direction, which may cause the battery case to break. invite The present invention suppresses the degree of pressure exerted by the grid on the battery case to less than the destructive force of the battery case, thereby preventing the grid that does not use antimony from stretching during use and destroying the battery case.
This prevents the terminal from being lifted.
The gist is that the cross-sectional area of the outermost frame of the positive electrode grid is the same as or smaller than that of the inner frame, and that the cross-sectional area of the outermost frame of the positive electrode grid is the same as or smaller than that of the inner frame, and that the cross-sectional area of the outermost frame of the positive electrode grid is the same as or smaller than that of the inner frame. By creating a shape with one or more rods with a large cross-sectional area, the strength of the periphery of the grid can be set to be smaller than the force that would destroy the battery case, so that the grid will stretch and put pressure on the battery case during use. The purpose of this is to prevent the battery case from breaking even if it gets old by allowing the grid to stretch loosely. Hereinafter, the present invention will be explained using the drawings. FIG. 1 shows a conventionally used lattice, which consists of the outermost thick lattice 1 and the innermost narrow lattice 2. However, in such a structure, for the reason mentioned above, the inner arm 2 stretches and pushes the thick, rigid outer arm 1 outward, breaking the battery case. FIG. 2 shows an embodiment of the lattice of the present invention.
The outermost beam 3 of the lattice has a cross-sectional area equal to or smaller than that of the inner beam 2, and a part of the inner beam 2 is made thicker as shown by 4. The reason why the thick inner rods 4 are included is to increase the strength of the lattice, make handling of the electrode plate easier, and improve castability. In addition,
The position and number of the thick inner beams 4 are not limited to the embodiment shown in the drawings, and one or more may be provided in both or either the vertical direction and the horizontal direction of the lattice. Next, we fabricated each 100Ah lead-acid battery using a grid plate with the shape shown in Figures 1 and 2, and conducted continuous overcharging of 1A at 50°C to examine the effect on the destruction of the battery case. Ta. The results are shown in Table 1.

[Table] As is clear from Table 1, when the grid having the shape shown in FIG. 1 was used as the positive electrode, cracks occurred on the sides of the battery case after about one year. However, when a lattice with the shape shown in Fig. 2 (embodiment of the present invention) is used as the positive electrode,
As expected, the electrode plate stretched and hit the wall of the container, but the thin outer rod 3 on the outside of the thick inner rod 4 was bent by the strength of the wall of the container, absorbing the elongation stress of the electrode plate. . Therefore, there were no cracks on the sides of the battery case. Further, even if the thin outer rod 3 was bent, it would be outside the negative electrode shape, so there would be no short circuit between the two. As described above, the present invention is effective in preventing the destruction of the battery case, which is a fatal defect of batteries, and has great practical value.

[Brief explanation of drawings]

FIG. 1 is a side view showing a lattice used in a conventional lead-acid battery of this type, and FIG. 2 is a side view showing an embodiment of a lattice used in a lead-acid battery of the present invention. 1...outer rail, 2...inner rail, 3...thin outer rail, 4...thick inner rail.

Claims (1)

[Scope of Claims] 1. A positive electrode lattice for a lead battery made of a lead alloy without using antimony and having an outer rail 3 and an inner rail 2, wherein the outer rail 3 has the same cross-sectional area as the inner rail 2. The positive electrode lattice for a lead battery has one or more inner latches 4 having a larger cross-sectional area than other lattices in both or either one of the vertical and horizontal directions of the lattice.