JP3500863B2 - Electrode material cutting equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device which is one device for producing a battery electrode plate, and more specifically, a hoop-shaped battery electrode material is fed at a constant speed by a conveyor or the like, The present invention relates to a cutting device for forming a large number of electrode plates by sequentially cutting.

[0002]

2. Description of the Related Art A conventional cutting device will be described as an example of a cutting device for an electrode material for a cylindrical alkaline storage battery. As shown in FIG. 4A, a positive electrode plate 11 and a negative electrode plate 12 for a cylindrical storage battery are sequentially overlapped with a separator 13 interposed between these electrode plates, and a spirally wound electrode group is formed. Are configured. As shown in FIG. 4 (b), a punching metal made of a steel plate having a thickness of about 0.1 mm is used as the current collector 14, and both sides of the current collector 14 are substantially evenly paste-like as the power generators 15. By applying the power generation material and drying it, a hoop-shaped electrode material 16
Is being manufactured.

In the case of such a cylindrical battery, the positive electrode plate 11 and the negative electrode plate 12 have a rectangular shape, but in consideration of productivity and energy density, a large number of them are provided as shown in FIG. 5 (a). This is because the electrode plate 17 is cut out into a rectangular shape from the hoop-shaped electrode material 16 by cutting with the cutting die punch 22.

At this time, the current collector 14 made of steel plate is the power generator 15
Since the electrode material 16 is cut into a rectangular shape because it is harder and tougher than the adhered part of FIG.
As shown in (3), the current collector protrudes slightly (hereinafter, simply referred to as a burr) and protrudes from the cut surface. When forming the spiral electrode group, it is obviously necessary to prevent the burr 18 from breaking through the separator and short-circuiting the positive and negative electrode plates inside the battery. For that, Bali 18
Is oriented toward the inner diameter side of the spiral current collector 14,
It is necessary to control the direction of the burr 18. In other words, the burrs 1 generated on both long sides of the rectangular plate 17
The eight directions must be unified. Therefore, conventionally,
As shown in FIG. 5 (a), when the cutting process is performed in the cutting die punch, the hoop-shaped electrode material 16 placed on the cutting die stand 19 is flowed at a constant timing by a conveyor or the like to cut the die. Although the electrode plate 17 was formed by cutting with the punch 22, instead of directly cutting the electrode plate 17,
The loss part 20 is provided on the hoop-shaped electrode material 16, and the electrode plate 17 is formed by cutting the loss part 20. This will be described in some detail with reference to FIG. In FIG. 6 (a), reference numeral 16 denotes a hoop-shaped electrode material. As shown in FIG. 4 (b), a paste serving as a power generator 15 is formed on both surfaces of the current collector 14 using punching metal. After coating, drying and rolling the electric power generation material, both long sides of the electrode material 16 are processed into a hoop shape. Although slightly exaggerated and enlarged in this processed surface, burrs 23 occur. Also, burr 2
Although the direction of 3 can be freely controlled, at present, the burrs 23 on both long sides are machined so that the directions thereof are opposite. After that, the electrode plate 17 is divided by a cutting process using the cutting die punch 22. Now, considering the direction of the burr on each of the four sides of any one polar plate 17,
Since both short sides (corresponding to both long sides of the hoop-shaped electrode material 16) have been subjected to the above-described processing and are not subjected to subsequent cutting processing, the burrs 23 are directed in directions opposite to each other. Further, the burrs 18 generated on both long sides of the electrode plate 17 are processed so as to face the same direction.

The reason why the direction of the burr 18 is set in this way, that is, when the electrode plate 17 is wound up in a spiral shape,
It will be briefly described that the burr 18 formed on both long sides of 7 has a problem that damages the separator when facing outward and needs to face inward. As described above, the negative electrode plate 12
Although there is a metal plate as the current collector 14 at approximately the center in the thickness direction of, the electrode group is manufactured by winding it around a thin mandrel with a diameter of about 3 mm, so the center part should be bent with a considerably large curvature. Becomes Further, since the current collector 14 is a thin steel plate and has higher rigidity than the portions on both sides of which the power generators 15 are applied, the portions outside thereof are subjected to tensile stress, and the portions inside thereof are It will receive compressive force. Therefore, the thickness of the power generation portion on the outer peripheral side of the current collector 14 becomes small, but the thickness of the power generation portion on the inner side of the current collector 14 becomes thicker. Therefore, considering the distance between the current collector 14 and the separator 13, since the separator 13 is closely wound around the power generator 15, the outer space is narrow and the inner space is slightly wide. It is better to turn the burr 18 inward
The trouble that the separator 13 comes into contact with the burr 18 and is damaged is reduced.

Further, in FIGS. 6 (b) and 6 (c), the relative positional relationship of the positive electrode plate 11, the negative electrode plate 12 and its burr 18, the separator 13 and the like immediately before being spirally wound up as a group of electrode plates. And size are shown. The left end portion of the figure is the portion that has the largest inner diameter when wound in a spiral shape, and when the burr 18 at the left end of the negative electrode plate 12 extends to the inner diameter side, even when the separator 13 is pierced, the burr 18 is at a close distance. Since there is no positive electrode plate 11, there is almost no risk of an internal short circuit. Also, the right end is the outermost part when it is wound up spirally as an electrode group, so when the burr 18 faces in the outer peripheral direction, there is no concern of breaking through the separator 13 and the burr 18 contacts the battery case 21. It does not adversely affect the battery.

[0007]

However, in the above-mentioned conventional configuration, each time one electrode plate is formed from the hoop material, one loss portion is generated although the width is narrow. Further, the conventional cutting apparatus cuts only one electrode plate for each punch of the cutting die punch, and thus the productivity was poor.

SUMMARY OF THE INVENTION The present invention is intended to solve such a conventional problem, and an object of the present invention is to provide a cutting apparatus having excellent economical efficiency and productivity which can cut a plurality of sheets at the same time without producing a loss portion. To do.

[0009]

In order to achieve the above object, the present invention provides a cutting die base which serves as a pedestal on which a hoop-shaped electrode material is placed, and a cutting portion for cutting the electrode material. A cutting die for cutting the electrode material in the cutting portion, and a cutting device for cutting the electrode material into individual electrode plates, wherein a cutting width of the cutting die punch is the electrode plate. And the electrode material corresponding to the tip side of the electrode material and two electrode material side electrode plates is sent to the cutting processing section on the cutting die table every time the cutting die punch cuts. The electrode plate on the electrode material side is pulled out by the cutting die punch, there is no loss portion, and the direction of burrs is good.
Since it is possible to form a single electrode, it is excellent in economy and productivity. At this time, if the cutting device is provided with the corner cutting portions that cut the corners corresponding to the four corners of the electrode plate in the hoop-shaped electrode material, the safety when winding the electrode plate in a spiral shape is improved. It's better because it increases.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will now be described in detail with reference to the drawings. According to the apparatus of the present invention shown in FIG. 1, the electrode material 2 is sent on the cutting die base 1 on the cutting die table 1 in a conveyor manner like the conventional cutting and processing apparatus, but at this time, every time the cutting is performed by the cutting die punch 4. Then, two pieces of the electrode material 2 of the tip side electrode plate 3a and the electrode material side electrode plate 3b are sent. Then, the second electrode plate 3b on the electrode material side is cut by the cutting die punch 4 having a width equal to the width of the both electrode plates 3a and 3b. This allows two pole plates 3a
3b can be molded. The width of the electrode plate here means the length of both short sides of the electrode plate.

In the bipolar plates 3a and 3b thus formed, the cutting width of the cutting die punch 4 is equal to the width of the polar plates, so that the polar plates 3a and 3b are exactly the same in width. Further, the directions of the burrs 5 on both long sides of the tip side electrode plate 3a are unified upward, the directions of the burrs 5 on both long sides of the electrode material side plate 3b are unified downward, and the electrode material 2 is formed. Since there is no distinction between the front and the back and it can be considered as the same, by turning one electrode plate over in the next process etc., the direction of the burr 5 is unified on all four sides of the rectangular electrode plate. The electrode plate can be formed.

FIG. 2 shows the structure of a mold having a corner cutting portion 6 and a cutting processing portion 7 according to the present invention. In this drawing, the electrode material 2 is manufactured so as to be fed from the lower part to the upper part of the drawing. ing. 6 is a corner cutting part, and the corner 8 is cut here. Reference numeral 7 denotes a cutting processing portion, which cuts the electrode material 2 described above. Further, the processing method in the apparatus of the present invention will be briefly described with reference to FIGS. As shown in FIG. 2 and FIG. 3, first, one punch of the cutting die punch 4 is sequentially fed with the electrode material 2 corresponding to the two width dimensions of the electrode plate from the bottom to the top of the drawing, and the metal is drawn on the drawing. In the corner cutting part 6 which is the lower part of the mold, the corner parts 8 corresponding to the four corners of the electrode plate are cut, and at the same time, the cutting processing part 7 which is the upper part of the mold.
In step 2, the electrode material side 3b is pulled out by the cutting die punch 4 to cut the two electrode plates 3a and 3b. The electrode material side electrode plate 3b that has been pulled out is discharged below the cutting die punch 4 in a state where the direction of the burr 5 due to the cutting of both ends of the long side is unified upward, and the electrode plate 3b is discharged below the cutting die punch 4. It is conveyed to the outside of the mold by a lower conveyor 9 provided on the lower side of 1. On the other hand, with respect to the tip side electrode plate 3a, the direction of the burr 5 due to the cutting of both ends of the long side is unified downward, and the burr 5 is discharged to the right side of the upper surface of the mold and conveyed to a predetermined place on the upper conveyor 10.

[0013]

As is apparent from the above-described embodiment, according to the cutting apparatus of the present invention, two electrode plates are cut per punch of the cutting die punch even though the cutting is performed in a single row. Since it can be processed, the direction of burrs is good, and the loss portion is unnecessary, it is possible to provide a cutting device for an electrode material, which is remarkably improved in economic efficiency and productivity.

[Brief description of drawings]

FIG. 1A is a plan sectional view of an electrode plate cutting device of the present invention. (B) Front view of the electrode plate cutting device of the present invention

FIG. 2 is a somewhat detailed plan view of the electrode plate cutting device of the present invention.

FIG. 3 is a slightly detailed front view of the cutting apparatus of the present invention.

FIG. 4A is a vertical sectional view of a general cylindrical alkaline storage battery, and FIG. 4B is a perspective view of a conventional electrode material.

FIG. 5 (a) is a front sectional view of a conventional cutting device. (B) A perspective view of a conventional electrode plate

FIG. 6 (a) Correlation diagram of electrode materials for general batteries and electrode plates (b) Plan view showing mutual positional relationship between general positive and negative bipolar plates and separators (c) General positive and negative bipolar plates and separators Front view showing the mutual positional relationship of

[Explanation of symbols]

1 cutting die stand 2 electrode material 3a Tip side electrode plate 3b Electrode material side plate 4 Cutting die punch 5 Bali 6 corner cutting part 7 Cutting processing section 8 corners 9 Lower conveyor 10 Upper conveyor 11 Positive plate 12 Negative electrode plate 13 separator 14 Current collector 15 Power generator 16 Electrode material 17 plates 18 Bali 19 cutting die stand 20 Loss part 21 battery case 22 Cutting die punch 23 Bali

─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP-A-57-121150 (JP, A) JP-A-54-69727 (JP, A) JP-A-56-120070 (JP, A) JP-A-59- 63663 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01M 4/26

Claims (2)

(57) [Claims] 1. A cutting die base that serves as a pedestal on which a hoop-shaped electrode material is placed, a cutting processing portion that cuts the electrode material, and a cutting die punch that cuts the electrode material in the cutting processing portion. In the cutting apparatus for cutting the electrode material into electrode plates for each sheet, the cutting width of the cutting die punch is equal to the width of the electrode plate,
Further, every time the cutting die punch cuts, the electrode material corresponding to the tip side of the electrode material and the two electrode material side electrode plates is sent to the cutting section on the cutting die table, and the cutting die is cut. An electrode material cutting and processing apparatus, characterized in that the electrode material side electrode plate is pulled out by a die punch. 2. The electrode material according to claim 1, wherein the cutting device is provided with corner cutting parts for cutting the corners corresponding to the four corners of the electrode plate in the hoop-shaped electrode material. Cutting equipment.