JPS58223266A - Plate grid of lead-acid battery - Google Patents

Abstract

PURPOSE:To improve holding ability of an active mass and increase friction during conveying of a grid by forming rough surface and slip protection on the surface having no lead coating, of a plastic grid comprising acid resistant synthetic resin forming lead coating on one part of its surface. CONSTITUTION:Both end portions A of a plastic grid connecting two pieces of grid, comprising acid resistant synthetic resin are make thin than the center portion B of it. A coating 2 of lead alloy is formed in the portion A so that the thickness of portion A and B become same and an active mass is filled thereon. The surface 7 having no lead coating 2 makes rough to increase active mass holding ability, and concave-convex portions for slip protection are formed on part of the surface 8. Therefore, coming off of the active mass is prevented, and when the grid 1 is conveyed with a conveyor to an active mass filling machine, position slippage of the grid 1 is prevented by the slip protection for easy production.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate grid for a lead-acid battery. The plate lattice of a lead-acid battery has the function of a skeleton that holds the active material and maintains the shape of the plate, and a conductor that conducts current. be done. On the other hand, an important issue is to make the storage battery lighter in clay, which means reducing the weight of the electrode grid and the weight of the storage battery. Plate grids for lead-acid batteries are usually manufactured by casting lead alloys, with a thickness of 1
It is extremely difficult to cast a lattice with a thickness of 1 mm or less, and a cast lattice with a thickness of 1 mm or less is poor in mechanical strength (V), and there is a limit of 1.1 in reducing the weight of a cast lattice with a sluice σ. Therefore, a plate lattice was used instead of a lead alloy cast lattice, and a plastic lattice was noticed.
A case r body is formed with acidic synthetic resin 12, and - on its surface
・A coating of lead alloy is provided on the part, and a part of the lead alloy is replaced with +Vt by a synthetic resin of 1/10 of lead. 31 The present invention relates to an improvement of this plastic lattice, and its purpose is to eliminate the drawbacks of the conventional plastic lattice. A conventional plastic grid (two-layered) that is subject to improvement of the invention is shown [7
ing. In the same figure, 1 is a glass grid made of acid-resistant synthetic resin, and some parts on both sides (pole & F parts) are thinly formed in the middle parts (lower part of the electrode plate) B and L. By providing a lead alloy coating 2 on this thin portion A, A and B have the same thickness. In this plastic lattice conductor, a lead film 2 is provided only in part A, and lead is omitted in other parts BK). The reason why the thickness of A on which the lead coating is provided is made equal to the thickness of B is to make filling of the active material paste smooth. 3. The lead coating is formed by dipping or pouring. 0 for molten lead at 530℃
When immersed for 5 seconds, a lead coating with a thickness of about 0.5 sieve can be formed. Therefore, if the thickness of part B of the plastic grid is 1.711Ill and the thickness of part A is 11, the thickness of part A where the lead coating is formed is 05 + 1.1 + 0.3.
= 1.7 totoru.

As shown in FIG. 2, the plastic grid 1ii in FIG. Gully to uniform thickness,
This is the cutting line C, which is temporarily cut to form the electrode plate, but there are problems as described below. (1) Since the surface of the plastic grid 1 is smooth, there is little friction between it and the cloth belt 5, and while it is being sent to the hopper 4, the plastic grid 1 moves and overlaps with the next plastic grid to be sent. The position may shift, causing trouble in filling the active material paste. (2) Since the plastic grid 1 has a smooth surface, it has a weak holding power for the active material and has the disadvantage that the active material easily falls off. The cast grid does not shift in position due to its own weight and the friction between the lead and the cloth belt, and because the lead is chemically bonded to the active material, there is little chance of the active material falling off. However, since the plastic lattice is lightweight, has a smooth surface, and has no chemical bond with the active material, it causes the above-mentioned drawback (IO2). The present invention is intended to overcome this drawback.

The present invention has a glass grid made of acid-resistant synthetic resin with a lead coating on a part of the surface, and the remaining surface on which the lead coating is not provided is made into a rough surface. This is a lead-acid battery plate grid characterized in that it is provided with.

FIG. 5 is a sectional view of the plastic lattice of the present invention having a rough surface 7, which corresponds to the XY section m1 in FIG. FIG. 4 is a cross-sectional view of the plastic grid of the present invention provided with grooves 8 for securing the bevel, and corresponds to the cross section taken along cutting line 0 in FIG. FIG. 4 0) shows a case where the unevenness 8 is provided in a direction perpendicular to the traveling direction of the cloth belt 3, and ←) shows a case where the unevenness 8 is provided in the direction of the traveling direction.

Since the plastic lattice of the present invention has the above structure,
The rough surface 7 effectively acts to hold the active material, and the unevenness 8 increases the friction between the active material and the cloth belt 6 and prevents the movement of the active material on the cloth belt 5.

In order to confirm the effects of the present invention, a cast grid (I) having the same shape as the plastic grid shown in FIG. 1, a conventional plastic grid (TI) shown in FIG. A comparison was made for 1,000 sheets each of the plastic grid of the present invention having the rough surface 7 and the roughness 8 shown in FIG. 4(b). The test was conducted and the following results were obtained.The active material shown in Table 2 was removed by filling a glass grid with the active material and drying it, and then horizontally placing it on the concrete from a height of 506R. After dropping the active material 5 times, the number of droplets of the active material was measured.

5- Table 1 Table 2 As mentioned above, the lead-acid battery plate grid made of the plastic grid of the present invention eliminates the above-mentioned drawbacks of the conventional plastic grid, and has the original features of the plastic grid. However, it has an excellent effect that further improves the advantage of being lightweight and suitable for mass production.

[Brief explanation of the drawing]

Figure 1: A plan view of a conventional plastic lattice Figure 2: A top view of an active material filling machine Figure 3: A sectional view of the plastic lattice of the present invention corresponding to the cross section taken along the 1: A cross-sectional view of the plastic lattice of the present invention corresponding to the cross section taken along cutting line C in FIG. [Symbol] 1...Plastic grid, 2...Lead coating,
5... Cloth heald, 4... Hopper, 5... Killer roller with spatula, 6... Wiper, 7... Rough surface, 8... Unevenness: J:,'4ゝ1'A0'' f ! # ? -,,. 7- Sai1 figure Spear 2 figure Fang3 figure Sai4 figure 345

Claims (1)

[Claims] The remaining surface of the plastic grid made of acid-resistant synthetic resin with a lead coating on a portion of the ice surface is made into a rough surface, and a portion of it is provided with unevenness to prevent slipping. A lead-acid battery plate grid characterized by