JPH0480514B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a grid for lead-acid batteries.

Structures of conventional examples and their problems Generally, grid bodies for lead-acid batteries are manufactured by a casting method, an expanding method, or the like. In the casting method, a structure is adopted that increases the holding power of the active material, such as by making the cross section of the lattice bones hexagonal. Also,
In the expanding method, as shown in Figure 1A and B, lead alloy strip sheets are cut and expanded, so when the grid is filled with active material to form an electrode plate, the contact surface is smooth. At the same time, the cross-sectional shape of the lattice part had to be simple, rectangular or square, and it was inferior to a cast lattice in terms of holding power of the active material.

OBJECT OF THE INVENTION An object of the present invention is to provide an expanded lattice with excellent active material retention ability.

Composition of the Invention The present invention is a method for manufacturing an expanded lattice body in which a belt-like sheet of lead or a lead alloy is expanded by making cuts in the width direction, and includes simultaneously forming lattice ribs and making irregularities on a part of the lattice ribs. This is a method for manufacturing a grid body for a lead-acid battery, characterized by providing a grid body for a lead-acid battery.

The reason why the lattice formed by the method of the present invention is superior to the conventional expanded lattice in terms of active material retention will be explained in more detail. Usually, the expanded lattice has rhombic lattice meshes 4 as shown in FIG. 1A, and the cross-sectional shape of the lattice ribs 1 is a parallelogram as shown in FIG. 1B. Therefore, when the coating thickness of the active material 3 approaches the lattice thickness, the active material is likely to be chipped off by a slight external force or vibration. In addition, 2 is the frame bone,
3 is a paste-like active material, and 5 is an ear portion.

As shown in FIGS. 2A and 2B, the lattice formed by the method of the present invention, like the conventional expanded lattice,
Basically, a diamond-shaped lattice is formed, but when comparing the shapes of each lattice rib, it is found that the lattice ribs are provided with concavities and convexities that are effective for retaining the active material through the processing process described below at the same time during the expanding process. For,
This has sufficiently improved the drawbacks of expanded lattice bodies manufactured by cutting and expanding belt-shaped sheets.

Description of examples Examples of the present invention will be described below.

The expanded lattice is generally obtained by processing the strip-shaped sheet 8 from the outside to the inside using a die that moves up and down and a plurality of blades 11 attached to sets 9 and 10, as shown in FIGS. 3A and 3B. It will be done.

As shown in FIGS. 4A and 4B, the conventional blade 11 has a simple sword tip shape. In the present invention, the shape of the blade 11 is shown in FIG. 5, and a press blade 11a is provided on the front end surface of the cutting blade for pressing the sheet 8 without cutting it. As a result, just before cutting the lattice bone, the tip portion 11a of the blade cuts the sheet 8.
is pressed to form irregularities on the surface of the lattice bone according to the cross-sectional shape of the press blade 11a, and an instant later, the lattice bone is cut and expanded to a desired width.

The formation of irregularities by this press and the development of the lattice ribs are almost simultaneous in terms of processing time. An example of the formation process is shown in FIGS. 6A, B, and C. Since the lead sheet 8 is a soft alloy, it first hits the tip of the lower set 10, which is slightly wider than the cutting blade, as shown in A, and this part is pressed as shown in B, depending on the cross-sectional shape of the press blade 11a. Then, it is cut as shown in C by the cutting blade 11 and expanded to become a lattice bone. Therefore, as shown in FIG. 2 according to the present invention, in the expanded lattice body of the present invention, among the diamond-shaped lattice bones, the lattice bones that are cut and expanded by the blade 11 provided with the press blade can be provided with irregularities.

When analyzing the active material retention power of the lattice, it is related to the thickness of the lattice, the number of bones, the shape of the bones, etc. Furthermore, although it is broadly classified into physical factors and chemical factors such as the type of alloy and crystal structure, the purpose of the lattice body according to the present invention is to improve the former physical factor. Of course, it is an easy and reliable method to increase the holding force by increasing the thickness of the lattice and the number of bones. However, in this case, it is clear that the amount of raw materials used increases, leading to an increase in costs, and it is not the best method.Therefore, although efforts have been made to improve the shape of the lattice bones, it is still insufficient. It wasn't.

Effects of the Invention The present invention maintains strong adhesion between the active material and the lattice bones by providing irregularities on a part of the surface of the lattice bones of an expanded lattice body, which conventionally had a parallelogram cross-sectional shape, during the expanding process. We have specially developed an excellent lattice body that prevents the active material from falling off the lattice body due to external force or vibration, and also minimizes the peeling or falling off of the active material inside the battery, increasing battery life. The purpose of the present invention is to provide a manufacturing method that can be manufactured during expansion processing without providing any additional equipment.

[Brief explanation of drawings]

Figures 1A and B are a front view and a sectional view of a conventional expanded lattice body, Figures 2A and B are a front view and a sectional view of an expanded lattice body according to an embodiment of the present invention, and Figures 3A and B are an expanded lattice body. 4A and 4B are front views and sectional views showing the cutting blade of a conventional expanded lattice body, and FIGS. 5A and 5B are schematic diagrams and side views showing the manufacturing process of the expanded lattice body. A front view and a sectional view of the cutting blade, and FIGS. 6A, B, and C are explanatory views showing the process of forming an expanded lattice body in an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Lattice rib, 2... Frame bone, 3... Paste active material, 4... Lattice, 5... Ear part, 8... Lead alloy sheet, 9... Die, 10... Set, 11 …
...Cutting blade, 11a...Press blade, 12...Expanded lattice body.

Claims (1)

[Claims] 1. A method for manufacturing an expanded lattice body in which a belt-shaped sheet of lead or lead alloy is expanded in the width direction using a cutting blade provided with a press blade on the front end surface, which includes the formation of lattice bones during the expanding process, and the process of forming lattice bones during the expanding process. A method for producing a grid for a lead-acid battery, characterized in that a portion of the grid is provided with concavities and convexities at the same time.