JPH10154517A - Lead-acid battery expanded metal grid with side band and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent active material falling-off so as to extend lead-acid battery life by providing a side band instead of side face main frame in the case of a cast grid on an expanded metal grid in which no main frame effective for active material falling-off prevention is provided on the periphery of an electrode plate grid, its side face is in an open state, and the active material is easy to fall off. SOLUTION: As winding back roll-like thin plate which is of pure lead or lead alloy, has a thickness of about 1mm, and has a certain width, certain cutting slits are machined in parallel to a width direction, and the same is spread in an orthogonal direction to a flow direction. By a so called expanded band metal grid manufacturing method, when rhombic meshes are made, the short cutting slits are made every certain intervals so that side bands having oblong thin meshes 16 are made on respective electrode plate grid boundaries, and the falling-off of active material from the electrode is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expanded metal grid for an electrode plate of a lead-acid battery using dilute sulfuric acid as an electrolyte, lead dioxide as an anode active material, and spongy lead as a cathode active material, and a method for producing the same. About.

[0002]

2. Description of the Related Art There are two types of grids for electrodes of lead-acid batteries: a cast grid as shown in FIG. 1 and an expanded metal grid as shown in FIG. Is filled with a paste kneaded with a dilute acid, dried, and then formed into a cathode plate or an anode plate. Among them, the expanded metal lattice has a certain width with a thickness of about 1 mm of pure lead or lead alloy,
This is obtained by a so-called expanded metal grid manufacturing method in which a fixed cut is formed in parallel with the width direction while the roll-shaped thin plate is unwound, and the cut is extended in a direction perpendicular to the flow direction. This method of manufacturing an expanded metal grid can be said to be a highly productive manufacturing method capable of continuously forming expanded metal grids for lead-acid batteries having diamond-shaped grids (cells).

[0003]

In the conventional expanded metal grid, an upper frame 4 provided with lugs 1 and a lower reinforcing frame 5 for reinforcing the lower portion are formed on the upper and lower sides by a punching method as shown in FIG. However, there is no rib 2 surrounding the electrode plate as in the casting grid shown in FIG. 1, and in particular, a portion of the vertical bone 3 cannot be formed on the side, and the side shown in FIG. An open portion 6 occurs, and the side surface is open. For this reason, the paste-filled active material is liable to fall off during the storage battery assembling process or during the use of the storage battery. It is impossible to prevent the battery from falling off during use. As a countermeasure, even if the active material of the anode plate falls off, a relatively excellent oxidation-resistant separator such as a polyethylene separator is formed in a bag shape so that it does not leak out and short-circuit with the cathode plate,
A method of assembling a lead-acid battery using an envelope-type electrode plate in which an anode plate is inserted has been adopted.

Also in this method, in the expanded metal grid, since there is no vertical bone on the side of the grid, the anode active material falls off due to repeated vibration and repeated charging and discharging during use, and accumulates at the bottom in the bag-shaped separator. . However, since the anode active material of a lead-acid battery is a strong oxidizing agent, the bottom inside the bag-shaped separator is oxidized and deteriorated, and eventually the anode material leaks out and short-circuits with the cathode plate, and the life of the battery is shortened. Run out,
There is a demand for an expanded metal grid that can prevent the active material from falling off.

According to the present invention, an expanded metal grid around an electrode plate grid which does not have an effective rib for preventing the active material from falling off, has an open side, and the active material is likely to fall off, The purpose of the present invention is to provide a side band in place of the rib to prevent the active material from falling off during the assembling process of the storage battery and during use of the storage battery, and to extend the life of the lead storage battery.

Further, the present invention provides a method of manufacturing an expanded metal grid excellent in productivity, in which a side band portion of a side of a cast grid instead of a vertical bone can be formed on the side of the expanded metal grid. The purpose is.

[0007]

SUMMARY OF THE INVENTION The above-mentioned objects are to provide an expanded metal for a lead-acid storage battery with side bands, characterized in that a side band portion in which fine grids are continuous is provided on the side of the expanded metal grid. Achieved by a grid.

Another object of the present invention is to provide a method for manufacturing an expanded metal grid in which cuts are formed in a rolled lead thin plate to form grids by extending and cutting the rolled lead thin plate at regular intervals. And alternately spread them to form strips of fine grids at each lattice boundary (= the portion cut to each veneer size, ie, the boundary of the electrode plate), and further punch out the lead thin plate for each veneer size This is also achieved by a method for manufacturing an expanded metal grid for a lead storage battery with side bands, characterized in that side bands are formed on the side surfaces of each expanded metal grid.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment of a method for manufacturing an expanded metal grid for a lead storage battery with side bands according to the present invention will be described with reference to the drawings (FIGS. 3 to 5).

First, as shown in FIG. 3, lead (for example, rolled into a roll shape) is rolled to a thickness of about 1 mm having a certain width corresponding to the height of a target electrode plate.
While unwinding the thin plate on the line, cut long and short cuts 7 and 8 in parallel with the width direction of the lead thin plate alternately at regular intervals so as to match the target electrode plate width. Perform processing to insert. The ratio between the length L of the long cut 7 and the length M of the short cut 8 may be any value that satisfies the requirement of L> M, but preferably L: M =
2: 1 to 15: 1, more preferably L: M = 5: 1 to 1
It is desirable to satisfy 5: 1.

Next, as shown in FIG. 4, diamond-shaped grids (cells) are formed by a so-called expanded metal grid manufacturing method in which a cut thin lead plate is spread in a direction perpendicular to the flow direction. A fine grid obtained by extending a short cut at each grid boundary of the expanded metal grid for a lead storage battery (= a portion cut to each single plate size, that is, an electrode plate boundary) will be formed. A band-like portion composed of small squares 12 is formed. In addition,
The dotted line 9 in FIG. 3 and FIG. 4 shows a line cut in the punching process to form the upper frame 9 ′ with lugs after spreading, and the large square 11 is located at the center of each veneer. This is a portion that constitutes a regular lattice (non-boundary portion).

Further, as shown in FIG. 5, the lead thin plate of FIG. 4 is further extended in a direction perpendicular to the flow direction, and when reaching the target plate height, each grid boundary (= each veneer plate). A band-shaped portion of a fine cut is formed at a portion to be cut into a size, that is, at an electrode plate boundary. Further, by punching the lead thin plate into a single-plate size, the upper frame 13 with lugs and the lower reinforcing frame 14 are integrally formed with the large and small grids (regular grids and fine grids) formed by extension. Thus, an expanded metal grid for a lead-acid battery having a side band having a desired function of preventing falling off is obtained. It goes without saying that the embodiment of the manufacturing method of the present invention is not limited to these.

An embodiment of an expanded metal grid for a lead storage battery with side bands according to the present invention will be described with reference to the drawings (FIG. 5).

The expanded metal grid for a lead storage battery with side bands according to the present invention, as shown in FIG. 5, is provided with side bands formed by continuous fine grids 16 on the side surfaces of the expanded metal grid. This is an expanded metal grid for a lead storage battery with side bands. Other constituent elements are not particularly limited, and a conventionally known expanded metal grid structure for a lead storage battery can be appropriately selected and applied. For example, as shown in FIG. 5, an upper frame 13 with lugs, a lower reinforcing frame 14 for reinforcing the lower portion,
Examples include a central portion in which regular grids 15 are continuously provided between the upper frame 13 and the lower reinforcing frame 14. However, embodiments of other components are not limited thereto. Not something.

Further, as shown in FIG.
The ratio of the total width 2d of the side bands on both sides is not particularly limited, but is preferably c: 2d = 20: 1 to 9: 1.

[0016]

Since the present invention is configured as described above, it has the following effects.

According to the method of manufacturing an expanded metal grid for a lead storage battery of the present invention, the length of the grid which is continuously formed at the center of the grid while being rewound onto a line from a rolled roll of thin lead sheet. Cuts (long cuts) in the eyes and short cuts (short cuts) to make the grid sidebands are made on the same line, making it easy to use the sidebands without reducing the productivity of conventional expanded metal grid manufacturing. Expanded metal grids can be made.

According to the expanded metal grid for a lead storage battery of the present invention, a lead storage battery assembled using an electrode plate made of the expanded metal grid is manufactured using a conventional casting grid. Like the lead-acid battery assembled using the provided electrode plates, the active material is less likely to fall off from the electrode plates during the storage battery assembling process and during use of the storage battery, resulting in a longer life.

The expanded metal grid for a lead storage battery with side bands according to the present invention is filled with a paste obtained by kneading lead oxide powder with dilute sulfuric acid, dried, and then formed using an anode plate and a cathode plate obtained by chemical formation. A description will be given of the results of a test lead-acid battery manufactured and subjected to a life test according to JIS.

The lead storage battery for life test uses 36B20R stipulated in JIS. There are two types, a glass mat type in which a glass mat is pressed on an anode plate, and an envelope type in which the anode plate is inserted into a polyethylene separator. A comparative test was performed using the grid, the conventional expanded metal grid, and the expanded metal grid of the present invention.

[0021]

[Table 1]

As shown in Table 1 above, the life of the lead-acid battery using the expanded metal grid of the present invention is substantially the same as that of the cast grid in both the glass mat type and the envelope type. This shows that the side band of the product of the present invention has a greater effect of preventing the active material from falling off from the side surface of the electrode plate, as in the case of the conventional vertical lattice cast lattice, as compared with the expanded metal lattice.

[Brief description of the drawings]

FIG. 1 is a plan view of a casting grid used for a conventional lead storage battery electrode plate.

FIG. 2 is a plan view of an expanded metal lattice used for a conventional lead storage battery electrode plate.

FIG. 3 is a plan view showing a state in which long and short cuts are made in a lead thin plate in a manufacturing process of an expanded metal lattice of the present invention.

FIG. 4 is a plan view showing an intermediate stage of a step of performing spreading next to FIG. 3 in a manufacturing process of the expanded metal grating of the present invention.

FIG. 5 shows a completed expanded metal lattice in a manufacturing process of the expanded metal lattice of the present invention, which is further expanded from the state of FIG. Things.

[Explanation of symbols]

1 ... lug of the electrode plate, 2 ... ribs surrounding the perimeter of the electrode plate, 3 ... vertical bones on the side of the electrode plate in the ribs, 4, 9 ', 13 ... upper frame with lugs of expanded metal lattice, 5, 10 , 14: Lower reinforcement frame of expanded metal lattice, 6: Open side of expanded metal lattice, 7: Long cut of expanded metal (longer cut), 8: Short of expanded metal lattice Notch (short cut), 9: Display of cut line when creating upper frame with lug, 11: Large grid of expanded metal, 12: Small grid of expanded metal, 15 ... regular grids (large grids), 16 ... fine grids (small grids) forming side band portions.

Claims (2)

[Claims] 1. An expanded metal grid for a lead-acid storage battery with side bands, wherein a side band portion having fine grids is provided on a side surface of the expanded metal grid. 2. A method for producing an expanded metal lattice, in which cuts are made in a rolled lead thin plate to form a grid, and long and short cuts are alternately inserted into the rolled lead thin plate at regular intervals. Forming strips of fine grids at each grid boundary and punching the lead thin plate for each veneer size to form side strips with continuous fine grids on the sides of each expanded metal grid A method for producing an expanded metal grid for a lead storage battery with side bands, characterized by comprising: