JPH10294108A - Device for applying active material of pole plate for alkaline storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a device for applying an active material of pole plate for an alkaline storage battery which can easily extrude the air within a three- dimensional porous core material when a paste active material is applied to this three-dimensional porous core material. SOLUTION: A plurality of filling rolls 4 are staggeringly arranged in the position of sandwiching a three-dimensional porous core material 1 under the condition that all the rolls are immersed in a paste active material 2 within an active material filling bath 3, along a passing route of the three-dimensional porous core material 1 within the active material filling bath 3. A pair of knife- shaped scrapers 5 having the smooth inner surface for finishing application are arranged at the position where the three-dimensional porous core material 1 to which the paste active material 2 has been filled within the active material filling bath 3 goes out from it and moves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active material coating apparatus for an alkaline storage battery electrode, which applies a paste-like active material stored in an active material filling tank to a three-dimensional porous core material.

[0002]

2. Description of the Related Art Conventionally, for an electrode plate for an alkaline storage battery, for example, in the case of a positive electrode plate of a nickel-cadmium battery, an adhesive material such as carboxymethylcellulose or methylcellulose is dissolved in water, and nickel hydroxide is contained in the aqueous solution. A paste-like active material obtained by kneading a fine powder is applied to a three-dimensional porous core material made of a foamed metal, and then the moisture is dried to produce the paste.

When a paste-like active material is applied to a three-dimensional porous core material, for example, as described in JP-A-63-160159, an active material filling tank containing a pace-like active material is used. An active material coating machine having a structure in which two knife-shaped scrapers are arranged in series in the up-down direction on the upper part was used.

[0004]

In order to uniformly pack the paste-like active material into the three-dimensional porous core material, a constant pressure is applied to the three-dimensional porous core material with a pace-like active material.
It is necessary to extrude the air inside the three-dimensional porous core material with the pace-like active material.

However, Japanese Patent Application Laid-Open No. 63-160159
In the structure as described in the publication, the pressure applied between the paste-like active material and the three-dimensional porous core material is determined by the transport speed of the three-dimensional porous core material and the distance between the knife-like scraper. It cannot be controlled freely, and the indentation pressure is as low as 30 mmAq at most, so air remains inside the three-dimensional porous core material, losing the space that can be filled with the active material paste by that much. There was a problem.

When a paste-like active material is applied to a three-dimensional porous core material in a state where a plurality of knife-shaped scrapers are exposed outside the active material filling tank, a plurality of times from the three-dimensional porous core material are removed. The scraped paste-like active material drips down onto the surface of the knife-like scraper one step below, and after a while, dries and becomes a lump, and this lump becomes 3 lump after application.
There is a problem that a scar is formed on the surface of the electrode plate which is coated flat by contact with the three-dimensional porous core material.

An object of the present invention is to provide an electrode for an alkaline storage battery capable of easily extruding air inside the three-dimensional porous core material when applying the paste-like active material to the three-dimensional porous core material. It is an object of the present invention to provide a material application device.

Another object of the present invention is to provide an apparatus for applying an active material to an electrode for an alkaline storage battery, which does not leave a scar on the surface of the electrode with a lump of active material dried at the position of the knife-shaped scraper. is there.

[0009]

SUMMARY OF THE INVENTION The present invention improves an active material coating apparatus for an alkaline storage battery electrode plate for applying a paste-like active material stored in an active material filling tank to a three-dimensional porous core material. Things.

In the present invention, a plurality of filling rolls are immersed in a paste-like active material along a passage route of the three-dimensional porous core material in the active material filling tank. Are arranged in a zigzag at the position sandwiching the. In addition, a knife-like shape having a smooth inner surface for performing a finish coating is provided at a position where the three-dimensional porous core material filled with the paste-like active material in the active material filling tank moves out of the active material filling tank and moves. A pair of scrapers is arranged.

With such a configuration, every time the bubbles inside the three-dimensional porous core material come into contact with the staggered arrangement of the filling rolls, they are pushed out to the opposite side of the filling rolls by the paste-like active material. Air bubbles remaining inside the three-dimensional porous core material that has exited from the active material filling tank can be reduced as compared with the conventional method. For this reason, the porosity of the electrode plate can be reduced. In addition, since the knife-shaped scraper is paired, the paste-like active material drips from the upper scraper and adheres to the scraper, and the dried active mass does not scar the electrode plate surface.

In this case, the passage route of the three-dimensional porous core material in the active material filling tank may be provided so as to penetrate the active material filling tank upward from the bottom thereof, but the active material is filled from above. Any one may be provided so as to enter the material filling tank and make a U-turn in the active material filling tank and exit upward,
What is necessary is just to select suitably from factory conditions.

At a position where the three-dimensional porous core material makes a U-turn in the active material filling tank, a direction changing roll for changing the direction of the three-dimensional porous core material is provided. By such a direction changing roll, the three-dimensional porous core material can be U-turned at an appropriate position in the active material filling tank.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of an active material coating apparatus for an alkaline storage battery electrode plate according to the present invention.
This is an example.

In this active material coating apparatus, the passage route of the three-dimensional porous core material 1 made of a foamed metal such as a nickel foam is provided so as to rise from the bottom to the top. In the middle of this passage route, an active material filling tank 3 in which a paste-like active material 2 to be filled is stored and supported by a support (not shown). The passage route of the three-dimensional porous core material 1 in the active material filling tank 3 is also provided so as to penetrate the active material filling tank 3 upward from the bottom thereof.

A plurality of (two in this example, four in this example) charging rolls 4 driven along the route of passage of the three-dimensional porous core material 1 in the active material charging tank 3 form paste-like active materials. Substance 2
The three-dimensional porous core material 1 is arranged in a staggered manner at a position sandwiching the three-dimensional porous core material 1 in a state of being completely immersed. These filling rolls 4
The three-dimensional porous core material 1 is forcibly rotated in the direction of movement of the three-dimensional porous core material 1 by driving means (not shown) in the direction shown in the figure.

In a position where the three-dimensional porous core material 1 ′ filled with the paste-like active material 2 in the active material filling tank 3 moves out of the active material filling tank 3, a finish coating is performed. A pair of knife-like scrapers 5 having a smooth inner surface is provided.

With such a configuration, every time the bubbles inside the three-dimensional porous core material 1 come into contact with the filling rolls 4 arranged in a staggered manner, the paste-like active material 2 is applied to the opposite side of the filling rolls 4. Since it is extruded, the amount of bubbles remaining inside the three-dimensional porous core material 1 ′ that has come out of the active material filling tank 3 can be reduced as compared with the conventional method. For this reason, the porosity of the electrode plate can be reduced.

Further, since the knife-like scraper 5 is paired, the paste-like active material drips from the upper scraper to the scraper and adheres to the scraper, and this does not form a scar on the surface of the electrode plate as a dry mass. Becomes The paste-like active material scraped off by the knife-like scraper 5 is recovered in the active material filling tank 3 located immediately below.

In particular, in the case of the structure shown in FIG. 1, there is an advantage that the internal structure in the active material filling tank 3 is simplified.

FIG. 2 shows a second example of the embodiment of the active material coating apparatus for an electrode plate for an alkaline storage battery according to the present invention.

In this active material coating apparatus, the active material filling tank 3
The passage route of the three-dimensional porous core material 1 made of foamed metal is provided so as to enter the active material filling tank 3 from above, make a U-turn in the active material filling tank 3 and exit upward. ing. At the position where the three-dimensional porous core material 1 makes a U-turn in the active material filling tank 3, direction changing rolls 6a and 6b for changing the direction of the three-dimensional porous core material 1 are provided. Above the active material filling tank 3, the three-dimensional porous core material 1 which has moved in the horizontal direction has a direction changing roll 7 for turning the downward direction above the direction changing roll 6a toward the direction changing roll 6a. Is provided.

When the three-dimensional porous core material 1 enters the paste-like active material 2 in the active material filling tank 3, the first direction changing roll 6a
A plurality (two pairs, four in this example) of filling rolls 4 driven along the passage route of the three-dimensional porous core material 1 leading to
The three-dimensional porous core material 1 is arranged in a zigzag manner at a position sandwiching the three-dimensional porous core material 1 in a state of being completely immersed in the paste active material 2. These filling rolls 4 are forcibly driven to rotate in the direction of movement of the three-dimensional porous core material 1 by driving means (not shown) in the direction shown in the figure.

Even in such a configuration, the three-dimensional porous core material 1
Is pushed out to the opposite side of the filling roll 4 by the paste-like active material 2 every time the bubbles in the inside come into contact with the filling rolls 4 arranged in a staggered arrangement. Air bubbles remaining inside the porous core material 1 'can be reduced as compared with the conventional method. For this reason, the porosity of the electrode plate can be reduced.

In addition, since the knife-like scraper 5 is paired, the paste-like active material drips from the upper scraper to the scraper and adheres to the scraper, and the paste-like active material does not form a scar on the surface of the electrode plate as a dry mass. Becomes The paste-like active material scraped off by the knife-like scraper 5 is collected in the active material filling tank 3 located immediately below.

In particular, as in this embodiment, the direction change rolls 6a,
6b, the three-dimensional porous core material 1 is
By turning, the height of the active material coating device in the vertical direction can be reduced.

In the active material coating apparatus of the type shown in FIG. 2, the filling roll 4 is a three-dimensional porous material between the direction changing roll 6b and the surface of the paste active material 2, contrary to FIG. It can be provided along the passage route of the body core material 1, or can be provided on both sides. In particular, the route through which the three-dimensional porous core material 1 passes between the direction changing roll 6a and the surface of the paste-like active material 2 and the direction changing roll 6
When the filling rolls 4 are provided in a zigzag manner on the passage route of the three-dimensional porous core material 1 between the b and the surface of the paste-like active material 2, the paste-like active material 2 can be more favorably placed on the three-dimensional porous material. The core material 1 can be filled, and the porosity of the electrode plate can be further reduced.

[0028]

EXAMPLE A 2 wt% aqueous solution of carboxymethylcellulose was prepared, and nickel hydroxide was kneaded in the aqueous solution so that the water content was 27 wt% to prepare a paste-like active material 2. The paste-like active material 2 is put into the active material filling tank 3 using an active material coating apparatus as shown in FIG. 1 or FIG. 2, and a three-dimensional porous body having a porosity of 95% at a speed of 1 m / min. Core material 1
Through the paste-like active material 2 in the active material filling tank 3,
The paste active material 2 was applied to the three-dimensional porous core material 1. Each of the filling rolls 4 in the active material filling tank 3 had a diameter of 50 mm. The three-dimensional porous core material 1 ′ coated with the paste-like active material 2 in the active material filling tank 3 was then dried at 180 ° C. for 5 minutes and cut into required dimensions to obtain an electrode plate.

The porosity of this electrode plate was measured from a photograph of a cross section of the electrode plate, and compared with an electrode plate prepared using the above-mentioned conventional active material coating apparatus. Table 1 shows the results and the results of visually observing scars on the surface of the electrode plate that could be produced 5 hours after the start of coating. In comparison of the porosity of the electrode plates, the conventional product is shown as 100%.

[0030]

[Table 1] As is clear from Table 1, the porosity of the electrode plate prepared by the active material coating apparatus shown in FIG. 1 or 2 was determined by the active material coating apparatus described in the section of the prior art. It is clearly smaller than the porosity of the electrode plate. Further, it was confirmed that no scar on the electrode plate surface was formed by the active material coating apparatus shown in FIG. 1 or FIG.

The number of the filling rolls arranged in a staggered manner is not limited to the number shown in the figure, and an appropriate number of the filling rolls can be used.

Hereinafter, constituent elements of some of the plurality of inventions described in this specification will be described.

(1) An active material coating apparatus for an alkaline storage battery electrode plate for applying a paste-like active material stored in an active material filling tank to a three-dimensional porous core material, wherein: A plurality of drive-type filling rolls are staggered at positions where the three-dimensional porous core material is sandwiched in a state of being completely immersed in the paste-like active material along a passage route of the three-dimensional porous core material in the above. The three-dimensional porous core material filled with the paste-like active material in the active material-filled tank moves out of the active material-filled tank at a position where the three-dimensional porous core material moves out of the active material-filled tank. An active material coating apparatus for an electrode plate for an alkaline storage battery, comprising a pair of knife-shaped scrapers each having a proper inner surface.

(2) The passage route of the three-dimensional porous core material in the active material filling tank is provided so as to penetrate the active material filling tank upward from the bottom thereof.
Item 6. An apparatus for applying an active material to an electrode plate for an alkaline storage battery according to Item 1.

(3) The passage route of the three-dimensional porous core material in the active material filling tank is such that the three-dimensional porous core material enters the active material filling tank from above, makes a U-turn in the active material filling tank, and moves upward. The active material coating device for an alkaline storage battery electrode plate according to item (1), which is provided so as to protrude.

(4) At the position where the three-dimensional porous core material makes a U-turn in the active material filling tank, a direction changing roll for changing the direction of the three-dimensional porous core material is provided.
Item 10. Apparatus for applying an active material to an electrode plate for an alkaline storage battery according to item 9.

[0037]

According to the present invention, a plurality of filling rolls are formed along the passage route of the three-dimensional porous core material in the active material filling tank.
Since the three-dimensional porous core material is arranged in a zigzag manner at a position sandwiching the three-dimensional porous core material in a state of being completely immersed in the paste-like active material, bubbles inside the three-dimensional porous core material are staggered with the filling roll in a staggered arrangement. Each time it comes into contact, the paste-like active material is pushed out to the opposite side of the filling roll, so that the bubbles remaining inside the three-dimensional porous core material coming out of the active material filling tank are removed by a conventional method. Can be reduced as compared to. Therefore,
The porosity of the electrode plate can be reduced.

Further, in the present invention, the three-dimensional porous core material filled with the paste-like active material in the active material-filling tank moves out of the active material-filling tank to a position where the three-dimensional porous core material moves for finishing. Since a pair of knife-shaped scrapers having a smooth inner surface is arranged, it is possible to prevent the paste-like active material from dripping and adhering to the scraper from the upper-stage scraper, which prevents a dry lump from causing a scar on the electrode plate surface. be able to.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first example of an embodiment of an active material coating apparatus for an alkaline storage battery electrode plate according to the present invention.

FIG. 2 is a longitudinal sectional view showing a second example of the embodiment of the active material coating apparatus for an electrode plate for an alkaline storage battery according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 three-dimensional porous core material 1 ′ three-dimensional porous core material filled with paste-like active material 2 paste-like active material 3 active material filling tank 4 filling roll 5 knife-like scraper 6, 6 a direction changing roll 7 direction changing roll

Claims (4)

[Claims] 1. An active material coating apparatus for an alkaline storage battery electrode plate for applying a paste-like active material stored in an active material filling tank to a three-dimensional porous core material, wherein: A plurality of filling rolls are arranged in a zigzag manner at a position sandwiching the three-dimensional porous core material in a state of being completely immersed in the paste-like active material, along a passage route of the three-dimensional porous core material, At the position where the three-dimensional porous core material filled with the paste-like active material in the active material filling tank moves out of the active material filling tank and has a smooth inner surface for performing finish coating. An active material coating apparatus for an alkaline storage battery electrode plate, comprising a pair of knife-shaped scrapers. 2. The passage of the three-dimensional porous core material in the active material filling tank is provided so as to penetrate the active material filling tank upward from the bottom thereof. Active material coating device for alkaline storage batteries. 3. The passage route of the three-dimensional porous core material in the active material filling tank enters the active material filling tank from above, makes a U-turn in the active material filling tank, and exits upward. The active material coating device for an electrode plate for an alkaline storage battery according to claim 1, wherein the device is provided as follows. 4. The roll according to claim 3, wherein a direction changing roll for changing the direction of the three-dimensional porous core material is provided at a position where the three-dimensional porous core material makes a U-turn in the active material filling tank. An active material coating apparatus for an electrode plate for an alkaline storage battery according to the above.