JPH05275081A - Manufacture of plate for lead-acid battery - Google Patents

Abstract

PURPOSE:To provide a manufacturing method for a plate for a lead-acid battery capable of preventing a deformation at a lug part of the plate and a crack at a boundary portion between a grid portion, in which an active substance for the plate is filled, and a frame bone of the plate so as to prevent fallout of the active substance from the plate in the preparation of a unit plate by means of press working. CONSTITUTION:A manufacturing method for a plate comprising the next step: When unit plates are punched from a multi-feed electrode plate by means of press working, the thickness of a connecting blank portion is formed in such a manner that it is thinner than the thickness of the plate frame bone 2 and grid portion 1, the blank portion 3 is punched by means of press working so as to form lug parts 7 after an active substance is filled in the grid portions 1. Accordingly, the press pressure required for preparing unit pole plates can be reduced, so that deformation at the lug parts 7 and cracks at the boundary portion between grid portions 1, in which an active substance is filled, and a frame bone 2 can be prevented, resulting in the suppression of fallout of the active substance from the plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a lead-acid battery electrode plate, particularly a multi-piece electrode plate.

[0002]

2. Description of the Related Art A conventional method for manufacturing a unit electrode plate for a lead storage battery is
This will be described with reference to FIGS. 4 and 5.

FIG. 4 is a view showing a state before press working when a conventional unit electrode plate for a lead storage battery is prepared, and FIG. 5 is a view showing a state before press working of the same polar plate.

In the conventional method for manufacturing a unit electrode plate for a lead storage battery, a grid portion 1 filled with an active material as a grid body, a frame frame portion 2 and a plain portion 3 punched by pressing are integrally formed, and the grid is formed. After the portion 1 was filled with the active material, as shown in FIG. 4, the lattice portion 1 filled with the active material and the portion 2 to be the frame bone were fixed by the fixing plate 4 and the supporting plate 5 of the press machine. ..

Then, as shown in FIG. 5, the plain portion 3 is punched by the cutting teeth 6 to form the electrode plate ear portion 7 to form the unit electrode plate.

[0006]

However, in the conventional method of manufacturing a unit electrode plate, as shown in FIG. 5, the thickness of the frame-shaped portion 2 of the electrode plate and the solid portion 3 punched out by the press working. The thickness was the same. Therefore, a large press pressure is required when punching the plain portion 3 with the cutting teeth 6, and therefore the electrode plate ear portion 7 is deformed, or the electrode plate portion 1 filled with the active material and the portion 2 that becomes the frame bone. There was a case where a crack was generated in the boundary portion 8 of.

Due to the cracks at the boundary portion 8, the adhesion of the active material filled in the lattice portion 1 of the electrode plate to the lattice may be deteriorated, and the active material may fall off.

Further, when the electrode plate prepared by the above method is used for a battery, the battery capacity greatly varies during storage of the battery,
There has been a problem that the battery capacity cannot be sufficiently restored even by charging after storing the battery.

The present invention is intended to solve such a problem. When a unit electrode plate is produced by press working, the pressure of the blank for punching out the plain portion is reduced to reduce the pressure of the active material to fill the lattice portion and the frame bone portion. The present invention provides a method for manufacturing an electrode plate for a lead storage battery, which is capable of preventing cracks from being generated at the boundary portion between the electrode plate and the electrode plate and preventing the active material from falling off from the electrode plate.

[0010]

In order to solve such a problem, a method for manufacturing a lead-acid battery electrode plate of the present invention is a grid,
A plurality of lead alloy lattices consisting of frame bones and ears are integrally formed with a plain portion connecting these, and after filling the lattice portion with an active material, the plain portion is punched out by press working and the ears are formed. A method for manufacturing an electrode plate for a lead storage battery, in which a portion is formed to form a unit electrode plate, wherein the thickness of the blank portion punched out by the press working is formed thinner than the lattice of the unit electrode plate and the thickness of the frame bone, and then pressed. The blank portion is punched out by processing to form the electrode plate ear portion.

Here, it is preferable that the thickness of the ear portion of the unit electrode plate is made smaller than the width of the electrode plate frame bone connected to the electrode plate ear portion and larger than the thickness of the plain portion punched out by press working. ..

[0012]

In the method for manufacturing a lead-acid battery electrode plate according to the present invention, the thickness of the plain portion punched out by press working is determined by the unit electrode plate grid,
Since it is thinner than the part that becomes the frame bone, when punching the plain part with the cutting teeth of the press machine, it can be punched with a relatively small pressing pressure, so the ears of the electrode plate and the active material were filled. No large pressure is applied to the boundary between the grid and the frame of the electrode plate. Therefore, it is possible to prevent the electrode plate from being deformed or cracked during punching, and to prevent the active material from falling off from the electrode plate.

Further, when the electrode plate ears are formed, since the ears have a complicated shape, the ears are easily deformed by punching out the solid parts with a press, and the frame bone parts connected to the ears and the active material are formed. Cracks are likely to occur at the boundary with the filled lattice.

In such a case, the thickness of the ear portion of the electrode plate is made smaller than the width of the electrode plate frame bone connected to the electrode plate ear portion and is made larger than the thickness of the plain portion punched out by press working. By increasing the distance between the lattice portion filled with the active material and the electrode plate ear portion, the influence of the pressing pressure applied to the lattice portion can be reduced.

Thus, it is possible to prevent the occurrence of cracks at the boundary portion between the frame bone connected to the ears and the lattice portion filled with the active material, and to prevent the active material from falling off.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

1 (A), 1 (B), and 1 (C), in the method of manufacturing the lead-acid battery electrode plate of the present invention, four grid bodies and a plain portion connecting them are integrally formed. The figure is shown.

FIG. 1A is its top view, FIG. 1B is its side view, and FIG. 1C is its front view. As shown in FIG. 1, in the method for manufacturing a lead-acid battery electrode plate according to the present invention, the thickness a (mm) of the plain part 3 punched out by press working is determined by the thickness b of the grid part 1 or the frame bone part 2 of the electrode plate. (Mm), and the thickness c (mm) of the ears 7 of the electrode plate is set to the width d of the frame bone portion 2 of the electrode plate.
The thickness is thinner than (mm) and is thicker than the thickness a (mm) of the plain portion 3 punched by press working. Then, such a four-piece electrode plate is divided into two along the vertical thin portion.

Next, FIG. 2 and FIG. 3 show a method for forming the ears of the lead-acid battery electrode plate of the present invention. FIG. 2 is a diagram showing a state before press working when the unit electrode plate is made, and FIG. 3 is a diagram showing a state when press working the same electrode plate.

As shown in FIG. 2, in the manufacturing method of the lead-acid battery electrode plate of the present invention, the plain portion 3 punched out by press working.
Thickness (a) (mm) is smaller than the thickness (b) (mm) of the grid portion 1 and the frame bone portion 2 of the electrode plate filled with the active material.

Therefore, the fixed plate 4 and the support plate 5 of the press machine
The pressing pressure at the time of punching the plain portion 3 by fixing with the cutting teeth 6 can be reduced.

As a result, as shown in FIG. 3, a large amount of pressure is not applied to the boundary portion 8 between the grid portion 1 filled with the active material of the electrode plate and the frame bone 2 of the electrode plate during pressing, and cracks do not occur. Can be prevented.

A positive electrode plate for a lead storage battery having a nominal specification of 6V10Ah was prepared by the above method of manufacturing an electrode plate.

At this time, the ratio of the thickness a (mm) of the plain portion 3 punched out by press working and the thickness b (mm) of the grid portion 1 or the frame bone portion 2 of the electrode plate is a / b = 1.0, 0.8,
0.5, 0.3, and the thickness c (m
m) and the width d (mm) of the frame bone portion 2 of the electrode plate, c / d =
It was set to 1.0, 0.7, and 0.5. Then, for each combination, 200 unit electrode plates were pressed, and the state of crack generation at the boundary between the frame bone of the pressed electrode plate and the lattice portion filled with the active material was examined.
The results are shown in (Table 1).

[0025]

[Table 1]

As shown in (Table 1), in the conventional manufacturing method, the thickness a (mm) of the blank portion punched out by press working is equal to the thickness b (mm) of the grid portion or frame frame portion of the electrode plate. , Thickness c (mm) of the electrode plate ears and width d of the frame frame of the electrode plate
If (mm) is the same, the defect rate due to the occurrence of cracks is 3
Although it was around 0%, in the case of the production method of the present invention, there were no defects due to the occurrence of cracks.

Next, using these positive electrode plate, known negative electrode plate, separator and electrolytic solution, a lead storage battery for nominal specifications 6V10Ah was prepared, and its storage characteristics and over-discharge leaving characteristics were examined.

The storage characteristics were as follows: the remaining capacity of the battery when stored at 40 ° C. for 3 months in a charged state and then discharged at a current of 0.25 CA, and a constant voltage of 13.8 V (maximum current of 0.
The capacity recovery rate when charged at 4 CA) was examined.

The characteristics of the over-discharging storage are as follows: After discharging for 24 hours with a resistance equivalent to 0.25 CA, after leaving for 1 month at 25 ° C. in an open circuit, a constant voltage of 13.8 V (maximum current 0.4 C
The capacity recovery rate when charged in A) was examined.

These tests were carried out by making 10 batteries for each combination.

The test results of the storage characteristics are shown in (Table 2), and the test results of the over-discharge leaving characteristics are shown in (Table 3).

[0032]

[Table 2]

[0033]

[Table 3]

As shown in (Table 2) and (Table 3), the thickness a (mm) of the plain portion punched out by press working is equal to the thickness b (mm) of the grid and frame of the electrode plate. In the case of the manufacturing method or when the thickness c (mm) of the electrode plate ears and the width d (mm) of the frame bone part of the electrode plate are equal, the capacity remaining rate after storage, capacity recovery rate, and after leaving for over-discharge The capacity recovery rate was low, but in the case of the production method of the present invention, these characteristics were improved. This is because in the manufacturing method of the present invention, it is possible to prevent the occurrence of cracks in the boundary portion between the lattice portion and the frame frame portion filled with the active material of the positive electrode plate, and to prevent the active material from falling off. Is considered to be.

As shown in FIG. 6, in the manufacturing method of the lead-acid battery electrode plate of the present invention, the fixing plate 4 of the press working machine is used.
Even if the thickness of the portion to be fixed is the same as the thickness of the plain portion 3 punched by press working, the same effect is obtained.

[0036]

As described above, in the method for manufacturing the lead-acid battery electrode plate of the present invention, after the thickness of the blank portion to be punched out by press working is made thinner than the thickness of the electrode plate frame bone or lattice portion,
Since the electrode plate ears are formed by punching out the plain parts by pressing, the pressing pressure when punching the plain parts can be reduced, and the electrode plate ears are deformed and the electrode plate active material is filled. It is possible to prevent cracks in the boundary portion between the lattice portion and the frame bone portion and prevent the active material from falling off from the electrode plate.

Therefore, it is possible to prevent the capacity from decreasing when the battery is stored or after being left over-discharged.

[Brief description of drawings]

FIG. 1 (A) is a top view showing a state in which four grid bodies and a plain portion connecting these grids are integrally formed in the method for manufacturing a lead storage battery electrode plate of the present invention. Figure (C) Front view

FIG. 2 is a diagram showing a state before press working when a unit electrode plate for a lead storage battery of the present invention is formed.

FIG. 3 is a diagram showing a state of the homopolar plate during press working.

FIG. 4 is a diagram showing a state before press working when a conventional unit electrode plate for a lead storage battery is prepared.

FIG. 5 is a diagram showing a state during pressing of the same polar plate.

FIG. 6 is a diagram showing another press working when the unit electrode plate for lead acid battery of the present invention is formed.

[Explanation of symbols]

 1 Lattice part of electrode plate 2 Frame frame part of electrode plate 3 Plain part punched out by press working 4 Fixing plate 5 Support plate 6 Cutting teeth 7 Ear part of electrode plate 8 Crack part a Thickness of plain part b Lattice part of electrode plate And thickness of frame bone part c Thickness of ear part of electrode plate d Width of frame bone part of electrode plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeki Matsuzawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A plurality of lead alloy grids each comprising a grid, a frame bone and an ear portion are integrally formed with a plain portion interconnecting these, and the grid portion is filled with an active material.
A method for manufacturing a lead-acid battery electrode plate, in which the solid portion is punched out to form an ear portion by pressing, and a unit electrode plate is formed, wherein the thickness of the uncoated portion is greater than the thickness of the unit electrode plate lattice and frame bone. A method for manufacturing an electrode plate for a lead storage battery, which comprises forming a thin plate and then punching a blank part by pressing to form an electrode plate ear. 2. The unit electrode plate is formed such that the thickness of the ear portion is smaller than the width of the electrode plate frame bone connected to the electrode plate ear portion and is greater than the thickness of the plain portion punched out by press working, The method for producing a lead-acid battery electrode plate according to claim 1, wherein the blank portion is then punched to form the electrode plate ear portion.