JPS5916392B2 - storage battery plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a storage battery electrode plate, and its purpose is to manufacture a storage battery electrode plate that can prevent short circuits at the peripheral edge of the electrode plate during use as a storage battery. It is about providing law.

As an example of conventional storage battery electrode plates, paste type lead acid battery electrode plates are shown in FIGS. 4 and S. In the figure, 1' is an ear part, 2' is a thick lattice, 3' is a thin lattice, 4' is an active material, and 5' is a foot part. As an example of manufacturing paste-type lead-acid battery plates, lead powder is applied to a lattice body made of a lead-antimony alloy and consisting of an ear part 1', a thick lattice 2', a thin lattice 3', and a foot part 5'. A method is used in which a paste kneaded with sulfuric acid is filled and then subjected to a chemical conversion step to form the active material 4'. Then, a separator plate, a glass mat, etc. are interposed between the anode plate and the cathode plate made in this way, and a group of electrode plates is assembled, which is then placed in a battery case to complete a lead-acid battery.
In the lead-acid battery made in this way, the thick grid 2' at the peripheral edge of the electrode plate is exposed, and the active material of the electrode plate, especially the active material of the anode plate suspended in the electrolyte, adheres to the cathode plate and oxidizes there. When lead is reduced to lead, or when lead ions present in the electrolyte are electrodeposited on the cathode plate, these lead tend to grow in a dendritic shape on the cathode plate, and if this grows, the anode plate reached,
At this point, an internal short circuit occurs and the battery voltage drops rapidly, making it unusable as a storage battery.

Furthermore, this short-circuit phenomenon is difficult to occur through the separator without pinholes, but is more likely to occur at the thick grid 2' at the peripheral edge of the electrode plate where there is no shield. In order to overcome the above-mentioned drawbacks of the conventional storage battery electrode plates, the thick grid 2 at the periphery of the electrode plate is covered with an insulating material having a U-shaped cross section, or an insulating tape is pasted on the thick grid 2'. Countermeasures have been considered, such as processing the separator into a bag and storing the plates one by one inside the bag, and then assembling the plate group, but these methods are extremely time-consuming. However, it was extremely difficult to mechanize and significantly increased manufacturing costs.

The present invention has been made to overcome the above-mentioned drawbacks of conventional storage battery plates, and provides a method for manufacturing storage battery plates that is simple, has low manufacturing costs, and can be mechanized and mass-produced. The purpose is to

That is, the method is characterized in that synthetic resin powder is scattered in a steam flow, and is adhered to a preheated thick grid of electrode plates and thermally welded to form a resin coating on the surface of the thick grid.

An embodiment of the storage battery plate according to the present invention will be explained with reference to FIGS. 1, 2, and 3. 4 is an ear part, 2 is a thick lattice,
3 is a thin lattice, 4 is an active material, 5 is a foot portion, and 6 is a resin coating made by thermally welding polypropylene resin to the exposed surface of the thick lattice 2.

The storage battery electrode plate obtained by the present invention has the above-described structure, and the exposed surfaces of the thick grids 2 are all covered with synthetic resin, so that the conventional insulator with a U-shaped cross section is covered. , or has an insulating effect equal to or greater than that of an insulating tape.

In other words, if the battery is covered with an insulator with a U-shaped cross section, there will be a gap between it and the thick grid, and if the battery is covered with tape, the adhesion between the adhesive and the lead will not be good, so the battery will gradually leak during use. However, in the present invention, the synthetic resin powder is thermally welded to the thick grid 2 to form the resin coating 6, so the coating is complete and can last for a long time. It is durable for use.

Next, an example of a method for manufacturing the storage battery plate of the present invention will be described. Synthetic resin powder is scattered in a heated environment created by sending steam, superheated steam, or steam of a substance or mixture other than water with an appropriate boiling point, The synthetic resin powder, which is heated and blended with the steam flow by the hot air of the steam flow, is attached in a softened state to a thick grid of preheated electrode plates, and in order to be thermally welded, it is heated inside a furnace at a temperature of about 200 to 250 degrees Celsius, as shown in Figure 3. As shown, the unnecessary part of the electrode plate is covered with a shielding plate 7 and moved, and about 60 to 100 meshes of finely powdered polypropylene resin is blown into this furnace, and in a softened state, it is applied to the exposed surface of the thick grid 2. The resin coating portion 6 is formed by adhering and heat welding.

The polypropylene resin is melted and spread over the surface of the thick lattice 2 to form a layer of resin coating 6 without any lip holes. The thickness of the resin coating portion 6 can be freely adjusted depending on the scattering density and scattering time of the synthetic resin powder into the vapor flow. Although FIG. 3 shows an example in which the resin coating 6 is formed on the exposed surfaces of the upper and lower thick gratings 2 of the electrode plate, the resin coating 6 can also be formed on the exposed surfaces of the thick lattices 2 on the sides using the same method. In this case, the coating process is a two-step process, but both can be mechanized and mass-produced automatically by continuously passing the electrode plates through a furnace.

In the embodiments of the present invention, the resin coating portion 6 made of polypropylene resin has been described, but in addition to polypropylene resin, other suitable thermoplastic synthetic resins such as polyethylene resin, polyvinyl chloride resin, etc. can also be used.

Further, the resin coating portion 6 can be applied to both or one of the anode plate and the cathode plate, and can be selected depending on the application. As mentioned above, the storage battery electrode plate according to the present invention has a pinhole-free and peel-free resin coating on the exposed surface of the thick lattice, so short circuits at the electrode plate periphery can be prevented, and the manufacturing process can be fully automated. It is of great industrial value, as it can not only be produced easily but also reduce manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a storage battery plate according to the present invention, FIG. 2 is a longitudinal cross-sectional view taken along line A-A' in FIG.
Is Fig. 3 the resin coating of the electrode plate in Fig. 1? Fig. A is a plan view of a conventional lead-acid battery electrode plate, and Fig. 5 is a longitudinal cross-sectional view taken along line B-B' in Fig. 4. 2 is a thick lattice, and 6 is a resin coating.

Claims (1)

[Claims] 1. A storage battery electrode characterized by scattering synthetic resin powder in a steam flow, adhering it to a preheated thick grid of the electrode plate, and thermally welding it to form a resin coating on the surface of the thick grid to obtain a storage battery plate. Method of manufacturing boards.