JPS6322021B2 - - Google Patents

Description

[Detailed description of the invention]

Conventionally, when manufacturing grid substrates for lead-acid batteries using the expanded method, first, regular and continuous cuts are made in a lead or lead alloy thin plate at fixed lengths and intervals, and then cuts are made approximately perpendicularly to the plate surface as necessary. The cut is stretched by pressing to make the cut open, and then the thin plate is pulled and expanded in the width direction to form the cut into a predetermined opening area shape, and an expandable grid substrate as shown in FIG. get. In the drawings, a indicates a diamond-shaped lattice hole, b indicates a large number of mutually intersecting lattice bars that define the diamond-shaped lattice holes, and c indicates an intersection of the lattice bars. In particular, at the intersection, in the area surrounded by the dotted circle, at the chevron-shaped corners formed by the two lattice bars, the extremely large stress caused by the development of the cut is particularly concentrated. . Due to this stress concentration, the part undergoes plastic deformation and is further exposed to external forces due to the expansion of the active material during use or to a corrosive environment such as sulfuric acid, which easily causes local destruction and corrosion due to the progression of plastic deformation. , cracks, and finally breaks at the intersection, resulting in drop-off of the active material, poor conductivity, etc., resulting in inconveniences such as a shortened battery life. The present invention reduces such drawbacks and
The present invention provides a method for manufacturing an expandable lattice substrate for battery electrode plates that provides a long-life battery, and includes a method for manufacturing an expandable lattice substrate for storage battery electrode plates by making a number of cuts in a thin metal plate and then expanding the plate. manufacturing an expandable lattice substrate for a storage battery electrode plate, characterized in that, before or after making a cut in the thin metal plate before it is expanded, a recess is formed at a location including both ends of the cut by pressing or cutting. Law. Next, one example of implementing the present invention will be described with reference to the accompanying drawings. 2 to 4 show the manufacturing process of the present invention,
1 indicates a strip-shaped thin plate made of lead, lead alloy, or other suitable metal. For example, before each cut is made on a lead alloy thin plate 1 made of a lead-calcium-tin alloy with a thickness of about 0.75 mm, both ends of the cut are As shown in FIGS. 1 and 2, a large number of pressurizing recesses 2, 2, . . . are press-formed regularly at predetermined positions. The recess 2 may be formed on both the front and back sides of the thin plate 1, or may be formed only on one side. The recesses 2 are, for example, circular and have a diameter of about 0.8 mm and a depth of 0.1 to 0.2 mm, and the thin plate 1 is formed thin in each recess 2. The shape of the recessed portion is arbitrary, such as circular or polygonal.
The thin plate 1 in which a large number of recesses 2, 2, etc. have been regularly arranged in advance is then regularly made with a large number of cuts 3 according to a conventional method.According to the present invention, each cut 3 is made so that both ends thereof It is applied along the line connecting the centers of both the recesses 2, 2 so as to be included in each of the recesses 2. Thereafter, the cuts 3 were stretched out using a conventional method, and then a developing process was carried out to obtain an expandable lattice substrate of the present invention as shown in Figure 5. In the drawing, 4 indicates a diamond-shaped lattice hole obtained by expansion, 5 indicates a lattice cross section, and 6 indicates an intersection. Using the lattice substrate of the present invention thus obtained, a battery was constructed and a cycle life test was conducted. Table 1 below shows the results of similar tests conducted on battery configurations.
Shown below.

[Table] As is clear from the table, in the case of the present invention, the cycle life could be extended by more than 20% compared to the conventional method.
Note that the above-mentioned recess processing may be performed by cutting instead of pressing. As described above, according to the present invention, when manufacturing an expandable battery grid substrate, the concave portion is formed before or after forming the cut so as to include both ends of the cut before the expansion process, so that the manufactured It is possible to reduce the defect size of local fractures that progress due to stress concentration at the intersections of the lattice beams of the expanded lattice substrate, improve fracture resistance and corrosion resistance,
This has the effect of improving the service life of the battery.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a part of a conventional expandable battery grid substrate, Figs. 2 to 5 show the manufacturing process of the present invention, and Fig. 2 is a top view of a part of a lead alloy thin plate being machined with recesses. , FIG. 3 is a cross-sectional view taken along the line A--A, FIG. 4 is a top view of a part of the product after cutting, and FIG. 5 is a perspective view of a part of the product after the development step. 1... Lead alloy thin plate, 2... Recess, 3... Cut,
4... Lattice holes, 5... Lattice holes, 6... Intersections.

Claims (1)

[Claims] 1. In a method for manufacturing an expandable lattice substrate for a storage battery plate by making a large number of cuts 3 in a thin metal plate 1 and then rolling it out, before making the cuts 3 in the thin metal plate 1 or before rolling out the plate, Later, cut 3
A method for manufacturing an expanded grid substrate for storage battery electrode plates, characterized in that recesses 2 are formed at locations including both ends of the substrate by pressing or cutting.