JPH0133024B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing expanded grid plates used in lead-acid batteries.

Expanded lattice plates, which have recently been widely used as lattice plates for lead-acid battery plates, have the advantage of being easier to mass produce than conventional cast lattice plates, and require no skill to manufacture. It is particularly suitable for automotive lead-acid batteries.

However, since the lead alloy strip used to manufacture expanded grid plates is generally manufactured by rolling, its surface is smooth, and its ability to retain the active material is inferior to that of cast grid plates with unevenness. In applications where vibration cannot be ignored, such as in batteries, the active material often falls off, often shortening its life.

In order to improve this point, methods such as processing the expanded mesh part with a rotating brush or sandblasting are considered, but the former method inevitably deforms and breaks the mesh part, which is a quality control problem. , it was also difficult to implement from the standpoint of stable operability.

The latter method of sandblasting can provide a good surface condition, but extremely large-scale equipment is required to perform uneven sandblasting on mesh parts that are continuously produced, and running costs such as sand replenishment and power consumption are reduced. It was no match at all.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of expanded grids. To achieve this objective, a lead alloy strip is made notches and simultaneously expanded and connected by mesh elements through node portions. In the method for manufacturing expanded lattice plates for lead-acid batteries that form a mesh part, when notches are made in the lead alloy strip, non-notched parts are left between opposing node parts in the stretching direction, and the non-notched parts are left between the node parts facing each other in the stretching direction. This is an expanded lattice plate for lead-acid batteries that is stretched and cut to form burr-like protrusions, and an apparatus for manufacturing the same.

An embodiment of the present invention will be described with reference to the drawings.

A conventional apparatus for manufacturing expanded grid plates for lead-acid batteries by expanding lead alloy strips is shown in FIG. 2, in which a lead alloy strip 3 is placed between a die 1 and a cutter 2 shown in FIG. The strip 3 is passed in the direction shown by the arrow, and the strip 3 is carved gradually inward from both ends, so that an unexpanded portion remains in the longitudinal direction of the sheet in the center. The sheet expanded by this device is then passed through processing rollers (not shown).
As shown in FIG. 3, the sheet 4 is pressurized and flattened by a sheet 4, with the non-mesh portion 4a in the center and the mesh portions 4b on both sides, as shown by the dotted line in FIG. The expanded lattice plate 5 is obtained by cutting as shown in FIG. Good expansion processing was possible by setting the thickness to about microns.

However, the expanded lattice plate 5 manufactured in this manner had poor active material retention as described above.

Therefore, as shown in FIGS. 5 and 6, if a sliding groove 6 is provided on the die 1' side of the sliding surface A of the die 1' and the cutter 2, reaching the tip of the die 1',
In this part, the lead alloy strip 3 is not cut instantly, but is cut when it is stretched to the limit of plastic deformation, and as a result, the expanded lattice plate that is completed is as shown in Figure 1. As a result, protrusions 7 shaped like cutting burrs are formed at positions corresponding to the grooves 6 of the die 1' shown in FIGS. 5 and 6. That is, the uncut portion of the strip is stretched between the node parts 9 and 9 in the hole 8a of the mesh part 8 connected by the mesh element 9b via the node part 9 by the expanding process, and the uncut part of the strip is stretched by cutting. A cutting burr-like protrusion 7 is formed in the direction.

In order to generate this protrusion 7, the depth of the groove 6 must be at least four times the clearance between the die 1' and the cutter 2, and at least
It is desirable that the thickness be 200 microns or more.

The protrusions 7 thus produced have, for example, a width of 1 mm, a density of 2 microns, and a height of 1 to 3 mm. The protrusions 7 have the effect of holding the active material paste filled in the next step, and are particularly effective in suppressing the active material from falling off even in applications where vibration cannot be ignored, such as in automobiles, and the expanded lattice plate is used. It is possible to significantly improve the life performance of lead-acid batteries. Furthermore, the present invention has great industrial utility value in that it exhibits the above-mentioned excellent effects without adding any new steps and without any increase in cost.

[Brief explanation of drawings]

Fig. 1 is a front view of a lead-acid battery showing an embodiment of the present invention, Fig. 2 is an explanatory top view of a state in which it has been expanded using conventional manufacturing equipment, and Fig. 3 is an explanatory view of a top view of a lead-acid battery that has been expanded using conventional manufacturing equipment. FIG. 4 is a perspective view of a die removed from a conventional manufacturing device; FIG. 5 is a top explanatory view of a manufacturing device showing an embodiment of the present invention; and FIG. 6 is a manufacturing device of this embodiment. FIG. 3 is a perspective view of the die removed from the device. 1' is a die, 2 is a cutter, 3 is a lead alloy strip, A is a sliding surface, 6 is a groove, 8 is a mesh part, 7
8a is a hole, 9 is a node,
9b is a mesh element.

Claims (1)

[Scope of Claims] 1 Cuts are sequentially cut in the lead alloy strip 3 in a zigzag pattern, and the mesh portions 8 are formed by extending in the right angle direction, and the cuts have a non-cut part formed in the middle part, and the non-cut parts are formed in the middle part. A method for manufacturing an expanded lattice plate for a lead-acid battery, characterized in that the notches are stretched during the stretching to form protrusions 7 in the shape of cutting burrs. 2. A device for manufacturing an expanded lattice plate for lead-acid batteries, which is equipped with a die 1' and a cutter 2, in which the die 1' and the cutter 2 work together to make cuts of arbitrary length in the lead alloy strip 3. Sequentially increments a large number of
The sliding surfaces A of the die 1' and the cutter 2 have grooves 6 in the sliding direction reaching their tips on either side. characterized by
Manufacturing equipment for expanded grid plates for lead-acid batteries.