JPH0161231B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in lead acid battery substrates.

Conventionally, grid substrates for lead-acid battery plates have been manufactured using a casting method, but in recent years there has been a demand for maintenance-free batteries, as well as lighter weight, higher capacity, and longer lifespans. Due to this demand, machining methods, that is, punching methods and expanding methods, are attracting attention and are being developed and put into practical use in place of the above-mentioned casting method.

In the conventional punching method, a thin plate of lead or a lead alloy is punched out in a lattice shape by rolling to form a lattice substrate 1 having plate ears 2 and plate feet 3 as shown in FIG. It is something. In this case, the method for punching out the substrate is shown in FIG. 2, where a rolled lead or lead alloy thin plate (hereinafter simply referred to as a lead alloy thin plate) 4 is lattice-plated in a direction PD perpendicular to the rolling direction RD. A punched substrate 1 is obtained in a shape.

In the drawing, two substrates 1 and 1' are punched out so that their legs 3 are common.

When such a substrate 1 is used as an electrode plate for a storage battery, the electrode plate necessarily extends in the direction perpendicular to the rolling direction, that is, in the direction of the rolling width. There is a tendency to stretch in the direction of the foot. However, the ears are straps,
Since the legs are attached and fixed to the frame, the electrode plate cannot extend and is forced to curve. Therefore, the plates exhibit a bulging shape, and adjacent plates or straps easily come into contact, thereby causing a short circuit and shortening the life of the battery.

The present invention is made of a thin plate 4 made of lead or lead alloy as a result of intensive research aimed at improving such drawbacks.
The thin plate is a rolled plate, and the thin plate has a vertical rail 5.
It is punched out in a grid pattern surrounded by
The vertical direction RD of the vertical rail 5 is the same as the rolling direction of the plate 4.

An embodiment of the present invention will be described in detail based on the drawings.

Rolled lead alloy thin plate 4 as shown in Fig. 3
The rolling direction RD and the positions of the ears 2, 2' and the foot parts 3 are set in the same direction RD to obtain the punched substrates 1, 1' in a lattice shape surrounded by the vertical bars 5 and the horizontal bars 6. It is something.

In the figure, two substrates 1 and 1' are punched out so that their legs 3 are common.
Also, the positions of the ears 2, 2' on the boards 1, 1' are alternately placed on the right or left side, but it is not necessary to install them in this way, and the required number can be increased by installing them only on the right or only on the left. It is possible to punch out several boards in a row.

When a storage battery electrode plate is formed from the substrate obtained in this way, since the electrode plate is stretched in the direction of the rolling width as described above, even if only the sides of the electrode plate have a bulged shape, the ear and foot portions It has no effect on the .

In other words, although the electrode plates bulge on their sides, there is no contact between the sides and the electrode plates do not come into contact with each other at all, which prevents short circuits and extends the battery's lifespan over a long period of time. It is something that can be endured.

Fig. 4 shows another embodiment according to the method of the present invention, in which a plurality of plates arranged side by side can be manufactured continuously, which can significantly improve productivity and eliminate lead alloy waste. It is something that can be reduced.

The thus obtained electrode plates of the present invention and the electrode plates prepared by the conventional method as shown in FIG. 2 were applied to storage batteries, and the cycle life of the electrode plates was measured, and the results are shown in Table 1.

Table 1 Product of the present invention: 210 cycles Conventional product: 50 cycles In addition to the machining and punching method used in the present invention, the outer expanding method may also be used.

As detailed above, the present invention has remarkable effects such as significantly improving the performance and productivity of storage batteries.

[Brief explanation of drawings]

FIG. 1 is a plan view of a storage battery electrode plate, FIG. 2 is a schematic illustration of how to obtain a conventional storage battery electrode plate, and FIGS. 3 and 4 are a schematic illustration of how to obtain a storage battery electrode plate of the present invention. It is a diagram. 1... Lattice board, 2... Ear part, 3... Foot part, 4
...Lead alloy thin plate, 5...vertical rail, 6...horizontal rail.

Claims (1)

[Claims] 1. Consists of a thin plate 4 of lead or lead alloy, the thin plate comprising:
This is a rolled plate, and the thin plate is punched out in a lattice shape surrounded by vertical bars 5 and horizontal bars 6, and the vertical direction RD of the vertical bars 5 is the same as the rolling direction of the plate 4. , A lead-acid battery substrate characterized by: