JPH0963592A - Manufacture of electrode plate for battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode plate for a battery capable of obtaining a chamfered square electrode plate by absorbing displacement in positioning an electrode original plate and blanking so as not to form sharp parts and edge parts. SOLUTION: An electrode original plate is blanked zigzag to obtain a chamfered square electrode plate. A skeleton part 11b formed between adjacent blanking holes 11a of a blanked electrode original plate 11 is blanked wider than the bone part 11b to obtain the chamfered square electrode plate 6.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for manufacturing an electrode plate used in batteries such as nickel-cadmium batteries and nickel-hydrogen batteries.

[0002]

2. Description of the Related Art Nickel-cadmium batteries, nickel-
Storage batteries such as hydrogen batteries are widely used as a power source for various electric devices.

The electrode plate of such a battery is manufactured to a required size by punching a predetermined electrode original plate by pressing. The manufactured electrode plate is inserted into a battery can together with a separator, an electrolytic solution is injected into the battery can, and a lid is attached to complete the battery.

The electrode plate is formed in a rectangular shape corresponding to the shape of the battery, but it is necessary to chamfer the corners of the electrode plate in order to facilitate insertion into the battery can.

Further, the remaining portion of the original electrode plate punched out is unnecessary and therefore discarded. However, since the material cost of the original electrode plate occupies a large portion of the battery manufacturing cost, it is necessary to minimize the remaining portion of the original electrode plate due to punching.

As a conventional method for manufacturing a rectangular electrode plate with chamfered corners by reducing the remaining portion of the original electrode plate by punching, there is, for example, the one disclosed in JP-A-59-127370. .

FIG. 4 shows an arrangement of punching dies of a punching machine used in the conventional method. As shown in FIG. 4, the punching machine 2
0 has two punching dies 21 of the first stage and three punching dies 22 of the second stage. The punching dies 21 and 22 have a rectangular shape, and their corners are chamfered. First-stage punching die 2
Between 1, 21 and between the second-stage punching dies 22, 22, 22,
The electrodes are spaced by a distance corresponding to the lateral length x of the electrode plate 23 to be obtained. Further, the first-stage punching die 21 and the second-stage punching die 22 are separated by a distance corresponding to twice the lateral length y of the electrode plate 23. The punching dies 21 and 22 in each stage are supported by the punching machine 20 so as to perform the punching operations simultaneously.

5 and 6 show a step of punching an electrode original plate using a punching machine.

First, as shown in FIG. 5A, the electrode original plate 24 is movably mounted between the guides 25, 25, and the tip of the electrode original plate 24 is attached to the first die 21 of the punching machine 20.
After that, the first-stage punching die 21 is operated to punch out the electrode original plate 24. As a result, as shown in FIG. 5A, two chamfered rectangular electrode plates 23 are obtained.

Next, as shown in FIG. 5B, the original electrode plate 24 is moved in the arrow direction (solid line) by the vertical length y of the electrode plate 23.
And the second punching is performed. by this,
A portion adjacent to the first punching hole is punched by the first-stage punching die 21, and two electrode plates 23 are obtained from the portion. Then, as shown in FIG.
4 is further sent in the direction of the arrow (solid line) by the vertical length y of the electrode plate 23, and the third punching is performed by the first-stage punching die 21 to obtain two electrode plates 23.

After the third punching, the electrode plate 24 is replaced with the electrode plate 2.
When it is delivered by the vertical length y of 3, the remaining portion adjacent to the punching hole is positioned below the second-stage punching die 22, and when punching in this state, as shown in FIG. 6 (B), 2-stage punching die 22
Thus, three electrode plates 23 are obtained. 26 is
It is a small piece that remains after punching.

The electrode plate 23 having a predetermined shape is manufactured by sequentially performing the above operation.

[0013]

In the conventional method, the cutting surface formed after punching the electrode original plate 24 and the punching die 2 are used.
It is necessary to punch with the end faces of 1 and 22 aligned. However, in reality, it is impossible to position them so that they completely coincide with each other. Therefore, as shown in FIG. 7 (A), the cut surface 24a of the electrode original plate 24 and the punching die 21 (22).
There may be a gap between the end surface 21a (22a) and the end surface 21a (22a). In such a case, as shown in FIG. 7B, the end portion 23a and the sharp portion 23b are formed on the obtained electrode plate 23.
When the sharp portion 23b is formed on the electrode plate 23, the sharp portion 23b
There is a possibility that b may penetrate the separator that insulates the positive electrode plate and the negative electrode plate and cause a short circuit.

The present invention has been made in view of the above problems, and absorbs a deviation when positioning the electrode original plate, and chamfers a rectangular electrode without forming an end or a sharp portion by punching. It is an object of the present invention to provide a method for manufacturing a battery electrode plate, which is capable of obtaining a plate.

[0015]

In order to solve the above-mentioned problems, a method of manufacturing an electrode plate for a battery of the present invention comprises:
Punching in a staggered manner to obtain a chamfered rectangular electrode plate,
Next, the bone portion formed between the adjacent punching holes of the punched electrode original plate is punched wider than the bone portion to obtain a chamfered rectangular electrode plate.

According to the present invention, in the second step, the bone portion formed between the adjacent punching holes of the punched electrode original plate is
Since it is punched out wider than the bone part, even if there is a deviation when positioning the electrode plate, it can be absorbed as a difference in the chamfered dimension of the obtained electrode plate, and the electrode plate obtained in the second step No edges or sharp parts are formed.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. The method for manufacturing a battery electrode plate of the present invention has two steps.

FIG. 1 is an explanatory view showing the first step of the present invention. FIG. 1A shows an electrode original plate 1. The electrode plate 1 is
A substrate having a large number of holes such as punching metal coated with a slurry of electrode material powder is dried by an appropriate method, and is manufactured through processes such as pressure pressing and surface treatment.
FIG. 1B shows a punching machine (lower die) 2 for punching the electrode original plate 1. The punching machine 2 has a plurality of first punching dies 3 arranged in a staggered pattern, and each first punching die 3 has a corner portion of C = 1 to C = 1.
It has a rectangular shape with a C chamfer of 2 mm. FIG.
As shown in (C), the distance between the C faces of the adjacent first punching dies 3 is k.
In order to secure the strength of the electrode original plate 1 against punching,
They are separated by about 3 mm.

By stamping the electrode original plate 1 by the punching machine 2, a large number of punched holes 11a are formed in the electrode original plate 11 after punching, as shown in FIG. As shown in FIG. 1 (E), a C-chamfered rectangular electrode plate 4 having the same shape as the punching die 3 is obtained.

FIG. 2 is an explanatory view showing the second step of the present invention. In the second step, the electrode original plate 1 punched out in the first step
1 is positioned at a predetermined position, and the bone portion 11b formed between the adjacent punching holes 11a is punched by the second punching die 5 having a predetermined dimension. As shown in FIG. 2A, the second punching die 5 is formed so that the punching width p is wider than the width h of the bone portion 11b.

FIG. 3A shows the bone portion 11 of the electrode original plate 11.
An explanatory view showing the second punching die 5 for punching b, FIG. 3 (B),
When the position of the electrode master plate 11 is displaced, the electrode master plate 11 is
It is explanatory drawing which shows the 2nd punching die 5 which punches out the bone part 11b of this.

As shown in FIG. 3A, the bone portion 11 formed between the adjacent punching holes 11a by the second punching die 5.
Since b is punched wider than the bone part 11b,
As shown in (B), even if a deviation occurs when positioning the electrode base plate 11 (the electrode base plate 11 is displaced to the right side in the drawing), it can be absorbed as a difference in the chamfered dimensions of the obtained electrode plate. it can. Therefore, as shown in FIG. 2B, the electrode plate 6 obtained in the second step is not formed with an end portion or a sharp portion, and it is possible to prevent the occurrence of defects such as a short circuit of the battery.

After the second step, the remaining portion on the end side (see FIG.
The portion corresponding to 11c shown by the dotted line in (A)) is punched with a dedicated punching die. As a result, the remaining portion due to punching can be reduced.

The electrode plate 4 obtained in the first step and the second
Although the C plane dimension of the electrode plate 6 obtained in the process is different, C =
If it is about 1 to 2 mm, it does not affect the difference in battery performance.

The present invention is not limited to the above embodiments, and various modifications can be made within the technical scope described in the claims.

[0026]

According to the method of manufacturing an electrode plate for a battery of the present invention, the electrode base plate is punched in a zigzag manner so as to obtain a chamfered rectangular electrode plate, and then, between the adjacent punched holes of the punched electrode base plate. The chamfered rectangular electrode plate is obtained by punching out the bone part formed in a wider area than the bone part, so even if there is a deviation in positioning the electrode original plate, the chamfered dimension of the obtained electrode plate Can be absorbed as a difference. Therefore,
No edge or sharp portion is formed on the electrode plate obtained in the second step. As a result, it is possible to prevent the occurrence of defects such as a short circuit of the battery, and it is possible to significantly reduce the amount of wasted electrode plates.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a first step of the present invention.

FIG. 2 is an explanatory view showing a second step of the present invention.

FIG. 3 (A) is an explanatory view showing a second punching die for punching a bone part of an electrode original plate, and FIG. 3 (B) is a punching process for a bone part of an electrode original plate in a state where the position of the electrode original plate is displaced. It is explanatory drawing which shows a 2nd punching die.

FIG. 4 is an explanatory view showing an arrangement state of a punching die of a punching machine used in a conventional method.

FIG. 5 is a plan view showing a process according to a conventional method.

FIG. 6 is a plan view showing a process according to a conventional method.

FIG. 7 is an explanatory view showing an electrode plate manufactured by a conventional method.

[Explanation of symbols]

 1: Electrode original plate 11: Electrode original plate (after punching) 11a: Punching hole 11b: Bone part 2: Punching machine 3: First punching die 4: Electrode plate (first step) 5: Second punching die 6: Electrode plate (Second step)

Claims (1)

[Claims] 1. An electrode original plate is punched in a zigzag manner so as to obtain a chamfered rectangular electrode plate. Next, a bone portion formed between adjacent punching holes of the punched electrode original plate is separated from the bone portion. A method for manufacturing a battery electrode plate, characterized in that a chamfered rectangular electrode plate is obtained by wide punching.