JPS58140974A - Production method of lattice body for lead storage battery - Google Patents

Abstract

PURPOSE:To improve the strength and to minimize the shrink deformation by immersing a lattice structure made of synthetic resin mixed with a specific amount of glass fiber or carbon fiber in melted lead or lead alloy to form a lattice body for a lead storage battery. CONSTITUTION:A lattice structure 1 made of syntyetic resin is immersed in melted lead or lead alloy or poured with it so that a thin lead film is stuck to the surface of the lattice structure to form a lattice body. Synthetic resin mixed with 10-30%, by weight, of glass fiber or carbon fiber with a fiber diameter of 10-15mu and a fiber length of 1-5mm. is used for the lattice structure. Accordingly, the flexural strength can be increased and also the thermal deformation temperature is increased resulting in a better size precision, thus the reliability and productivity can be remarkably improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a lattice structure used in lead-acid batteries, in which a lattice structure made of synthetic resin is immersed in molten lead or a lead alloy, or the lattice structure is poured into molten lead or lead alloy. In the method of attaching a thin lead film to the surface of the lattice structure to form a lattice structure, we have completely improved the synthetic material to give it strength, improve reliability and productivity, and reduce shrinkage and deformation. The purpose of this is to improve dimensional accuracy.

−Bae゛ Reducing the weight of lead-acid batteries improves fuel efficiency in automobiles.

There is an extremely strong demand for electric vehicles today due to increased mileage, and for portable devices due to ease of portability.

However, lead-acid battery grids are typically manufactured by casting lead alloys. The specific gravity of lead is 11.3, making it difficult to cast with a thickness of less than 11 mm.
There are certain limits to reducing the weight of cast grids.

The role of the lattice body is to (1) ensure conductivity, (2) to maintain active material, and (3) to provide mechanical strength.Lead is used only in part 1, and roles 2 and 3 are filled with other materials with a lighter specific gravity, such as lead. A so-called lead alloy-synthetic resin composite lattice body using a synthetic resin with a specific gravity of 50% has been considered. For example, parts that require conductivity are cast in lead alloy in advance, and then placed in a synthetic resin mold.
i Insert it, pour synthetic resin and integrate it to create a lattice body.

Another method is to create a grid by laminating and bonding a synthetic resin grid and a perforated lead alloy plate. However, the manufacturing process and handling of these chairs are complicated, resulting in poor production efficiency and high costs.

The manufacturing method of the present invention involves immersing a lattice structure made of synthetic resin mixed with glass fiber or carbon fiber in molten lead or lead alloy and quickly pulling it up, or pouring molten lead onto a lattice structure made of synthetic resin. Synthesis 11 is characterized by the formation of a thin desert of lead on the surface of the fat body. This method simplifies the manufacturing process and allows continuous manufacturing, improving productivity. Furthermore, since the periphery of the lattice body is covered with a lead alloy, it has good adhesion to the active material, making it difficult for the active material to fall off, making it easier to assemble the sleeping pond and improving the battery life.

However, conventional synthetic resin bodies undergo large shrinkage and deformation after molding, and even if they are immersed in molten lead alloy and then pulled up, the synthetic resin deforms as soon as the lead alloy cools down, making it impossible to produce a fine lattice. Ta. In addition, the lattice strength is also weaker than that of lead alloys, causing problems such as deformation during the paste process and the like, and active material falling off during handling.

The lead-acid pond chartering-synthetic resin composite lattice of the present invention is produced by immersing a synthetic resin structure in which fibers such as glass fibers and carbon fibers are mixed in a synthetic resin in molten lead or lead alloy, or by immersing the structure in molten lead or lead alloy. By pouring it from above, a thin film of lining is completely formed on the surface of the lattice structure. Hereinafter, the present invention will be explained in detail with reference to Examples. The lattice structure 1 shown in FIG.
It is molded from polyethylene containing 30 parts by weight of glass fibers with a diameter of 12 microns and three lengths. This a- is about 33
By immersing it in a molten lead alloy heated to 5C for about 0.3 seconds and then pulling it up, a thin layer of about 200μ thick can be uniformly attached to the surface of the grid structure. Glass and carbon are good fiber materials to add, and considering moldability and strength, the fiber diameter is 10 to 15 μm.
, a fiber length of 1 to 5/rrM is common. The content depends on the strength, heat resistance, thermal expansion, and moldability of the synthetic resin required for the lattice. For example, when polypropylene contains glass fibers with a fiber diameter of 12μ and a fiber length of 3μ, the bending strength increases as the fiber content - page increases, as shown in Figure 2, and the heat distortion temperature increases. As shown in FIG. 3, the fiber content increases effectively up to 10%. However, above that level, the balance is maintained and increasing the amount has little effect. As shown in FIG. 4, the coefficient of linear expansion rapidly decreases when the fiber content reaches 10% by weight. As mentioned above, the fiber content is 1
It is effective if the amount is more than o. As the content increases, its dispersibility deteriorates, which affects molding conditions. The limit of the range in which the fibers are uniformly dispersed and productivity does not decrease is 30r4.

Synthetic resin materials include polypropylene, polyethylene,
Thermosetting or thermoplastic resins such as polyvinyl chloride, ABS, and phenolic resins may be used, but the strength and moldability after fiber inclusion will vary depending on the resin material, so the content must be determined according to the material. There aren't many.

According to the present invention, shrinkage deformation of the lattice structure after molding is eliminated by the addition of fibers, and the dimensional accuracy of the lattice structure is improved, so variations in the amount of lead thin film deposited and the amount of paste filled are reduced. In addition, the 6 pages are more resistant to heat, eliminating warping caused by heat during the process, reducing defects in the electrode plate quality and cracks in the active material, and eliminating active material falling off during handling. Furthermore, when lead adheres around the synthetic resin body,
The surface of a synthetic resin body melts due to the heat of molten lead, but fibers remain on the surface of a synthetic resin containing fibers after the surface melts, and the remaining fibers and thin lead film mix in a complex manner, resulting in a resin that does not contain fibers. In comparison, the adhesion between the lead and the synthetic resin lattice structure was stronger, making it difficult to peel off. As described above, the method for manufacturing a lattice body according to the present invention completely improves productivity and reliability.

[Brief explanation of the drawing]

The first figure is a top view of a lattice structure made of synthetic resin in a specific example of the present invention, FIG. 1B is a cross-sectional view taken along line B-B' of A, and FIG. Figure 3 is a diagram showing the relationship between glass fiber content and heat distortion temperature, and Figure 4 is a diagram showing the relationship between glass fiber content and linear expansion coefficient. be. Name of agent: Patent attorney Toshio Nakao and 1 other person x 9
15Q Figure 3 Ka... U2, 4 & Curing content rate (Due S to 2 Figure 4?

Claims (1)

[Claims] A lattice structure made of synthetic resin mixed with 10 to 30% by weight of glass fiber or carbon fiber is immersed in molten lead or lead alloy, or by pouring molten lead or lead alloy onto the structure. A method for manufacturing a grid for lead-acid batteries, characterized by forming a thin lead J pattern on the cinnabar surface.