JPS5861566A - Production method of lattice for lead storage battery - Google Patents

Abstract

PURPOSE:To obtain a close contact with an active material and to improve the productivity by immersing a lattice structure made of a synthetic resin with a cross section of a circular shape in melted lead so as to form a thin lead film on the surface of the lattice structure. CONSTITUTION:A lattice structure 1 is formed with a thermo plastic and thermosetting resin material such as polypropylene, and its cross section is made a circular shape or oval shape. This lattice structure 1 is immersed in a melted lead alloy controlled at the temperature of about 335 deg.C for about 0.3sec, then it is quickly taken out so that a thin lead film 2 with the thickness of about 200mu is uniformly stuck on the surface of the lattice structure 1. Accordingly, the synthetic resin material gets into a close contact with the thin lead film 2 and the strength of the lattice can be increased, and also the corrosion of the lead proceeds uniformly, thereby the life performance can be improved and the production process can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of lattices used in lead-acid batteries, in which a lattice structure made of synthetic resin is immersed in molten lead alloy and quickly pulled up. The purpose of this method is to improve performance reliability and productivity by improving the shape of the synthetic resin lattice structure to make it easier for the lead thin film to adhere to the grid structure by attaching a lead thin film. It is.

Reducing the weight of lead-acid batteries is in great demand today because it improves fuel efficiency for automobiles and makes them easier to carry.

However, lead-acid battery grids are typically manufactured by casting lead alloys. This lead has a heavy specific gravity of 11.3, and it is difficult to cast it to a thickness of less than 1 inch, so there is a certain limit to reducing the weight of a cast grid.

The main role of the lattice body is to ■ act as a conductor during charging and discharging, ■ hold the active material, and ■ ensure mechanical strength as an electrode plate.

A so-called lead alloy-synthetic resin composite grating body has been considered in which the role of (2) is replaced by another material with a low specific gravity, such as a synthetic resin whose specific gravity is approximately A that of lead.

For example, a method has been proposed in which the parts that require electrical conductivity are cast in advance from a lead alloy, which is then inserted into a synthetic resin mold, and the synthetic resin is poured in to integrate the parts to form a grid.

Also known is a method of making a grid by laminating and bonding a synthetic resin grid and a lead alloy perforated plate.

However, all of these have the drawbacks of poor productivity and high cost due to complicated manufacturing processes and handling.

In the present invention, a lattice structure made of synthetic resin is immersed in molten lead or a lead alloy and quickly pulled up, or molten lead is poured onto the synthetic resin body to form a thin lead film on the synthetic resin body. In this method, the manufacturing process is simplified and it is also possible to continuously manufacture the lattice body, so that the productivity of the lattice body is significantly improved.

Furthermore, the periphery of the lattice body is covered with a lead alloy, which has good adhesion to the active material, making it difficult for the active material to fall off, making it easier to assemble the battery and improving the performance of the battery.

However, the frame frame 1a shown in FIG. 1 is square, and the internal active material supporting frame 1b has a triangular cross-section.A grid structure 1 made of synthetic resin having the same shape as a conventional cast grid is immersed in molten lead. The lattice body manufactured by quickly pulling up had the disadvantage that the lead thin film a easily peeled off at the corners and could not be coated with a uniform thickness.

The lead-acid battery ship/intermediate resin composite lattice of the present invention is obtained by immersing a lattice structure made of synthetic resin with a rounded cross-sectional shape such as an ellipse in molten lead or a lead alloy;
Alternatively, a uniform thin film is formed on the surface by pouring molten lead or the like from above.

The content of the present invention will be explained in detail below using examples.

The lattice structure 1 made of synthetic resin shown in FIG. 2 is made of polypropylene, polyethylene, or polyvinyl chloride.

It is made of thermoplastic or thermosetting resin material such as ABS, As, or phenol resin, and its cross-sectional shape is circular or oval. Although it is generally desirable to have a circular shape, it is effective to use an elliptical shape when the electrode plate is thick or high mechanical strength is desired.

A synthetic resin lattice structure with such a cross-sectional shape.

A thin lead film 2 with a thickness of about 200μ is uniformly spread on the surface of the lattice structure 1 by immersing the body in a molten lead alloy whose temperature is controlled at about 335°C for about 0.3 seconds and then quickly pulling it up. Adhering force (can be used)

Under the above conditions, as a result of processing the conventional lattice with a square or triangular cross-sectional shape and the one with a circular cross-section of the present invention,
In the conventional product having corners, lead does not adhere to the periphery of the lattice with a uniform thickness as shown in the first drawing, but is thicker at the 806th part and thinner at the b part.

Furthermore, as shown in Figure 3, when the lattice structure has a square cross section with two sides on each side and the molten lead temperature and immersion time are varied, lead will adhere to the entire surface of the lattice structure under lead adhesion range condition A. Under conditions B, it is impossible to form a lead film on portion b as shown in the first diagram.

The principle behind forming a thin lead film on a lattice structure made of synthetic resin is that the synthetic resin being immersed in it has a lower melting point than the lead, so when the synthetic resin is immersed in molten lead, the heat is absorbed by the synthetic resin and the surrounding molten lead is absorbed. solidifies instantly. A thin film of lead is then formed by rapid pulling. Therefore, when soaked for a long time, the synthetic resin does not melt, but solidifies once.

It is not possible to attach a thin film of lead because the surrounding molten lead will raise the temperature above the melting point and melt again.

If there are corners in the cross-sectional shape of the lattice structure, the lead around the synthetic resin lattice structure loses less heat when attached to molten lead at the corner than at the side a, so the thin film of lead that adheres to the corner loses less heat. As the thickness becomes thinner, it is easily remelted by the surrounding molten lead, resulting in the shape shown in the first diagram.

Therefore, due to control of structural conditions, peeling off of the lead thin film during the manufacturing process, and breakage of the lead thin film, there are disadvantages in that conductivity is lost and the thickness is not uniform.

In the present invention, since the cross-sectional shape of the lattice structure is circular or elliptical as shown in FIG.
As shown in Figure A, the range of lead adhesion conditions has been expanded, allowing greater control over manufacturing conditions, eliminating the need for a thin lead film to form during the process, and improving reliability and productivity.

In addition, since the lead is cooled and shrunk before the lattice structure made of synthetic resin is cooled and shrunk, the adhesion between the synthetic resin body and the lead thin film is improved, and the strength of the lattice body is increased. The life performance has been improved because lead corrosion progresses evenly. As described above, the present invention has a simple structure and high value.

[Brief explanation of the drawing]

Figure 1 shows a conventional lattice structure made of synthetic resin; A is its front view, B is a cross-sectional view along the E-port of A, C is a cross-sectional view after being immersed in molten lead, and D is a high-temperature molten FIG. 2 is a cross-sectional view of a lattice structure made of synthetic resin according to an embodiment of the present invention, and A is a front view, and B is a cross-sectional view after being immersed in lead.
C is a sectional view taken along the E inlet, C is a sectional view after being immersed in molten lead, and FIGS. 3 and 4 are diagrams showing the relationship between molten lead temperature and immersion time to form a lead thin film. 1... Lattice structure made of synthetic resin, 1a...
...Frame bone, 1b...Active material supporting bone, 2.
...Lead or lead alloy thin film. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure @ 3 Figure Izuku t @ Tsuruto [ (・C) Figure 4 leaked personal information ('C)

Claims (1)

[Claims] 1. A method for producing a lead-acid battery lattice, which comprises forming a thin film of lead or lead alloy on the surface of the lattice structure by immersing it in water or by pouring the molten material from above.