JPH0472355B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a grid used in lead-acid batteries. More specifically, by reducing the amount of lead or lead alloy used and using it in combination with synthetic resin, it is possible to provide a lattice body that is lighter in weight and superior in strength compared to conventional lattice bodies.

Conventional structure and its problems Reducing the weight of lead-acid batteries improves fuel efficiency in automobiles.
There is a strong need for it in the case of electric vehicles because of its increased mileage, and in the case of portable devices because of its ease of portability.

However, the grid of lead-acid batteries is usually manufactured by casting a lead alloy. The specific gravity of pure lead is
Efforts have been made to make the lattice thinner to reduce its weight, but it is not only difficult to cast to a thickness of 1 mm or less, but also deformed during the subsequent base filling process, and difficult to handle. Because of problems such as sometimes bending, there was a certain limit to reducing the weight of cast lattice bodies. Therefore, it has been thought to use synthetic resin, which has a specific gravity about 1/10 of that of lead alloys, in place of lead alloys, using lead alloys only in the parts that require conductivity, and using active substances. Various so-called lead alloy-synthetic resin composite lattice bodies have been considered that use synthetic resin bodies for the holding portion. However, all of these require complicated manufacturing processes such as integrating the lead alloy and the synthetic resin body, and it is also difficult to make the thickness of the lattice body uniform, and the conductive lead alloy part has thin bones or thin Since it is a board, it is easily bent and deformed, making it difficult to handle. Therefore, although it is possible to reduce the weight to some extent, the productivity of the lattice body is poor,
The drawback was that it was not suitable for mass production.

OBJECTS OF THE INVENTION It is an object of the present invention to solve the drawbacks of the conventional examples and to provide a grid made of lead or lead alloy and synthetic resin, which has a uniform thickness as a grid.

Structure of the Invention Namely, in order to achieve the above object, the present invention provides a synthetic resin lattice structure in which a thin film is formed by immersing a composite lattice body in molten lead or lead alloy in a composite lattice body made of lead or a special alloy and a synthetic resin. Among the thicknesses of the thin film forming portion of the body, the outer circumferential bars located parallel to the molten lead or lead alloy surface are made thicker than the outer circumferential bars located perpendicularly.

By using such a synthetic resin lattice structure, it is possible to equalize the thickness of the outer circumferential frame portion of the completed lattice body, which is partially covered with a lead or lead alloy thin film.

Description of Examples Hereinafter, the lattice body of the present invention will be described based on Examples.

In Fig. 1, 1 is a lattice structure formed of polypropylene, and the thickness of the outer circumferential crosspiece 1a of the lattice structure in area A covered with lead by immersion in molten lead, etc. is equal to the thickness of the crosspieces other than A. In comparison, it is 0.3mm thinner on one side and 0.6mm thinner on both sides. For example, the thickness of the crosspiece in area A is 1.0mm, and the thickness of the crosspieces other than A is 1.6mm.
It is. The width of the crosspiece is also made thinner accordingly. Furthermore, the thickness of the backbone 1b that holds the active substance is 0.2 mm thinner than the outer circumferential frame. This lattice structure is turned upside down and only the region A is immersed for a very short time in molten lead 3 in a tank shown in FIG. here,
The temperature of molten lead is preferably 350°C or lower, and in this example, the temperature was 335°C. The immersion time was 0.3 seconds. Then cool with cold air or cold water.
After cooling, the thickness of the lead thin film 2 formed in both areas A should be approximately uniform at 0.3 mm as shown in Figure 2.
In reality, with respect to the direction of the molten lead surface D during immersion,
The thin lead film 2 on the portion of the lattice outer circumferential frame 1c located in parallel is approximately 0.1 mm thinner than that on 1a and 1b located perpendicularly to the molten lead surface. This is due to the resistance between the molten lead and the crosspiece 1c when it is pulled up from immersion.
This is because the outer circumferential crosspiece 1c located parallel to the molten lead surface has greater resistance during pulling up, so that the once solidified lead thin film returns to a molten state and the formed thickness of the lead thin film becomes thinner.

The present invention has focused on this point and made improvements, and only the part 1c of the outer circumferential frame of the area A, which is located parallel to the molten lead surface D, has been improved.
By making the synthetic resin body thicker in advance by the amount that the lead thin film 2 is formed to be thinner, for example, by making it 0.1 mm thicker than 1a located perpendicular to the molten lead surface, the lattice after the lead thin film 2 is formed is made thicker. The thickness of the outer circumference of the body is uniform. Of course, the material covering a part of the lattice structure may be not only a metal material but also a metal alloy, and the melting temperature and immersion time can be changed as appropriate.

Effects of the Invention The lattice body according to the present invention is extremely light in weight, less than half that of a conventional lead cast lattice body, even after the lead thin film is formed. In addition, even after the lead thin film is formed, the thickness of the outer periphery part is uniform, so there is no strain in the paste process for filling the paste-like active substance, and production is stable. Therefore, there is no variation in the filling of the active substance in electrode plates using the same grid, and the thickness of the electrode plate is constant. That is, after the battery is assembled, the pressure and group pressure applied to each part of the electrode plate are constant, and a lead-acid battery with an excellent lifespan in which the active substance is difficult to fall off can be constructed.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a synthetic resin lattice structure according to an embodiment of the present invention, FIG. 2 is a diagram showing a lead-synthetic resin composite lattice structure in which a part of the lattice structure is covered with a lead thin film, and FIG. FIG. 2 is an explanatory diagram when a synthetic resin lattice structure is immersed in molten lead. 1...Synthetic resin lattice structure, 1a, 1c...
...Peripheral frame coated with lead, 1b... Backbone for holding the active substance, 2... Thin lead film.

Claims (1)

[Claims] 1. A lattice structure in which a lead or lead alloy thin film is formed on a part of the surface of a lattice structure made of an acid-resistant synthetic resin, and the thin film is formed by immersing the lattice structure in lead or lead alloy. A lattice body for a lead-acid battery in which outer circumferential bars 1c located parallel to the molten lead or lead alloy surface are thicker than outer circumferential bars 1a located perpendicularly to the molten lead or lead alloy surface of the forming part.