JPH09180711A - Method and device for manufacturing plate for alkaline storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously manufacture a plate, which is not formed with bubbles and blow holes due to the residual air inside hole parts, by filling each hole of a punched metal with the slurry, and thereafter, coating an outside surface of the punched metal with the slurry. SOLUTION: A punched metal 2 is led into a slurry coating unit, and the slurry to be supplied onto a reverse roller 15 is forcibly filled in each hole 12 of the punched metal 2 so as to extrude the air inside the hole 12. A part 18 of the slurry 12 is passed through the hole 12 and extruded to the opposite surface. The punched metal 2 enters a container 14, and an outside surface thereof, which does not contact with the roller 15, is coated with the slurry 16. The outside surface of the punched metal 2 contacts a control piece 19, and the coating thickness thereof is controlled by the control piece 19. The slurry is pushed by a doctor knife 20, and a part of the slurry enters the hole 12 so as to extrude the slurry inside the hole 12, and projected 21 in the opposite surface. The slurry is passed through a clearance between a pair of doctor knives 5 so that the coating condition and the thickness of the slurry in both surfaces of the punched metal 2 are adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode plate for an alkaline storage battery, more specifically, a core material made of a band-shaped and continuous punching metal, mainly nickel powder or nickel hydroxide powder, and a binder or the like added to the core material for adjustment. The present invention relates to a method of manufacturing a storage battery substrate or an electrode plate to which the slurry is applied, and a manufacturing apparatus therefor.

[0002]

2. Description of the Related Art A typical continuous production apparatus for a substrate or an electrode plate for an alkaline storage battery has been shown in FIG.

That is, the punching metal 2 forming a strip-shaped long core material wound in a coil shape shown in FIG. 1 is drawn out and introduced into the slurry container 3 so as to pass from the lower side to the upper side. Punching metal 2 when passing through this container 3
A slurry 4 mainly composed of nickel powder, for example, is applied to both surfaces of the. The coating thickness of the slurry 4 is controlled when it passes between a pair of doctor knives 5 (slits), and reaches the inside of the drying furnace 6 to be dried. Then, the moving direction is reversed by the reversing roller 7 from the ascending direction to the descending direction, the moving direction is introduced into the sintering furnace 8, and heat treatment is applied to form a continuous sintered substrate 9 which is taken up by the take-up roller 10.

FIG. 2 is a detailed view of the slurry coating portion. The punching metal 2 guided by the guide rollers and introduced into the slurry container 3 is formed on a metal base 11 made of, for example, a nickel-plated iron plate. The holes 12 are opened. Therefore, when this punching metal 2 is introduced into the slurry container 3 and the slurry 4 is simultaneously applied from both the left and right sides, air is trapped in the holes 12 and the slit between the pair of doctor knives 5 is formed. Even after passing through and controlling the slurry coating thickness, the air trapped in the slurry loses its escape,
The slurry coated plate has a state in which so-called bubbles and cavities 13 are present.

This occurs even when the slurry is prepared by mainly using nickel hydroxide as an electrode active material, and even after the slurry is used as a sintered substrate or a battery electrode, the bubbles and cavities 13 are formed.
May adversely affect the characteristics.

[0006] A method of preventing the formation of air bubbles or cavities due to the entrapment of air and coating the slurry on a punching metal as a core material is also disclosed in, for example, Japanese Patent Application Laid-Open No. 62-69464. The outline of the method is that before applying the slurry to both sides of the punching metal that is the core material of the sintered substrate, prepare a guide roller partially immersed in this slurry and attach the slurry to the peripheral surface of this roller. When the punching metal comes into contact with the roller, the hole portion of the punching metal is filled with the slurry by a transfer method, and then the slurry is applied to both surfaces of the punching metal by a conventional method.

[0007]

However, this method requires a guide roller which is in partial contact with the slurry in addition to the reversing roller for coating the slurry on both sides of the punching metal in the slurry container. It is necessary to form a thin coating layer of slurry on the peripheral surface of the guide roller. When the slurry coating layer on the peripheral surface of the guide roller is thick, the punching metal slips on the roller, which makes it difficult to smoothly introduce the slurry into the slurry container. On the contrary, when the slurry coating layer is extremely thin, the above-mentioned slip phenomenon does not occur, on the other hand, the amount of slurry filled in the holes of the punching metal by the transfer method is too small to completely fill the holes with the slurry, In the subsequent slurry coating process on both surfaces, there is a problem that the air in the residual holes is trapped and becomes bubbles. Therefore, it is very important to control the thickness of the slurry coating layer on the guide roller, but delicate control could not be performed until now because it was affected by the viscosity of the slurry, the particle size of the powder used, the rotation speed of the guide roller, etc. .

The present invention is intended to solve such problems, and an object of the present invention is to provide a slurry coating method and an apparatus therefor, in which bubbles and cavities are not generated.

[0009]

According to the manufacturing method of the present invention, a core material made of punching metal is introduced into a slurry storage container provided with a reversing roller so that a part thereof is immersed in the slurry, and the reversing roller is provided with the core material. When changing the moving direction by contacting, first fill the hole of the core material with the slurry supplied on the roller, and then apply a certain amount of slurry on the outer surface of the core material in contact with the roller. Pull it out of the container and press the slurry coating surface of the core material that moves in the rising direction with a doctor knife or grade to push a part of the coating slurry together with the slurry in the hole to the opposite surface of the core material. The slurry on the right and left sides of the core material is controlled to a predetermined coating thickness by passing through the gap of the doctor knife.

The present invention also provides an apparatus for favorably performing the above-mentioned slurry coating, which apparatus is provided so as to be partially immersed in the slurry storage container and the slurry in this container, The reversing roller that contacts the punching metal of the core material and finally changes the moving direction to the ascending direction, the slurry supply nozzle that is located above the container and that supplies the slurry onto the peripheral surface of the reversing roller, and the core material Opposite the roller portion in contact, a slurry coating part consisting of a control piece for controlling the thickness of the slurry coated on the outer surface of the core material, and pressing the slurry coating surface of the core material passing through this Face the doctor knife or blade that pushes a part of the slurry to the opposite surface through the hole of the core material with a predetermined gap, and let the core material coated with the slurry pass through this gap to pass both sides. of It is obtained by constituting a pair of doctor knives for controlling the slurry Nurigi thickness.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the invention described in claim 1 of the present invention, in applying the slurry to the punching metal as the core material, the slurry supplied onto the reversing roller flows downward from above. When filling the hole of the core material using the property, then applying a certain amount of slurry in the slurry container to the outer surface of the core material that is in contact with the reversing roller, and when the reversing roller changes the moving direction to the rising direction Press the slurry coating surface of the core material with a doctor knife or blade to push a part of the slurry together with the slurry inside the hole of the core material to the opposite surface, and then the gap between the pair of doctor knives The slurry coating thickness is controlled to a predetermined thickness.

Therefore, the slurry coating section can be constituted by a slurry storage container and a reversing roller partially immersed in the slurry in the container, and the filling of the slurry into the hole of the core material is performed by contact between the core material and the reversing roller. Since it started at this point, and because the slurry is added with fluidity from the top to the bottom, it is not affected by the amount of slurry deposited on the roller or the layer state, and reaches the opposite surface of the core material. The holes can be filled with a sufficient amount of slurry.

Therefore, it is not necessary to prepare a guide roller separately from the reversing roller in order to fill the inside of the hole with the slurry as has been done so far, and it is possible to sufficiently fill the inside of the hole with the slurry, and to continue to this. Then, the slurry can be applied to the opposite surface of the core material without causing slip between the roller and the core material.

Further, from the surface of the apparatus, control for filling the slurry into the holes of the core material, applying the slurry to the outer surface of the core material, and adjusting the thickness of the slurry applied to the outer surface of the core material. Since the reversing roller is involved in the operation of each of the pieces, it is possible to make the slurry application portion simple.

[0015]

EXAMPLE A specific example of the present invention will be described below with reference to FIG.

The punching metal 2, which is a core material, is a metal base 11 having a large number of holes 12 formed therein. The punching metal 2 is pulled out from a coil state and introduced into the slurry coating portion from the right side as shown in FIG. The slurry coating part includes a boat-shaped slurry container 14, a reversing roller 15 which is partially immersed in the slurry 16 stored in the container and rotates, and a slurry on the upper surface of the reversing roller 15 which is not immersed in the slurry 16. It is mainly composed of a slurry supply nozzle 17 for supplying.

The slurry supplied from the nozzle 17 onto the roller 15 is contacted between the roller 15 and the punching metal 2 while the fluidity from the upper side to the lower side is accelerated by the rotating force of the roller 15 shown in the figure. It reaches the portion A, where it is rolled in from the roller side (upper side) to the container 14 side (lower side) between the punching metal 2 and the peripheral surface of the roller 15. Therefore, the slurry compulsorily caught from the upper side to the lower side enters the hole 12 of the punching metal 2 and pushes out the air in the hole. The second roller 15 protrudes to the opposite surface not in contact with the roller 15. However, since the roller 15 is located inside the slurry container 14,
Even if a large amount of the slurried slurry 18 is contained, it is accommodated in the container 14 and does not leak out of the slurry coating portion.

The punching metal 2 in contact with the roller 15 then penetrates into the slurry 16 stored in the volume 14, and the slurry 16 is applied to the outer surface not in contact with the roller 15. At this point, the slurry previously filled in the hole 12 and the slurry on the outer surface of the punching metal are in a continuous state.

After this, the punching metal 2 moves in the container 14 in contact with the roller 15 and the traveling direction thereof changes to the ascending direction, but the punching metal 2 leaves the container 14 and is still in the roller 1.
In the portion B in contact with the roller 5, the control piece 19 such as a doctor knife arranged so as to face the roller 15 for controlling the slurry coating thickness and the coating slurry on the outer surface are in contact with each other, and the slurry coating thickness Is controlled. The punching metal that has passed through the control piece 19 is then pressed with a doctor knife or blade 20 on the slurry-coated surface so that part of the slurry enters the hole 12 of the punching metal 12 so as to push it out and the hole 12 And penetrate 21 to project to the opposite side. After this state, the slurry on both the left and right sides of the punching metal is adjusted in its coating state and thickness by passing through the gap between the pair of doctor knives 5 for controlling the original slurry coating thickness.

Although not shown, a pair of doctor knives 5
It is advisable to scrape off the excess portion of the slurry adjusted in step 1 with a scraper or the like and return it to the container 14. If it does not overlap the slurry of punching metal rising from below, the slurry clogging between the pair of doctor knives The resistance at the time of passing through the gap and the gap can be kept low and the coating thickness can be controlled well. The slurry-coated punching metal that has passed through the pair of doctor knives 5 is subjected to the same drying process and sintering process as described above.

If the slurry 16 used is prepared mainly by nickel powder and adding a binder to it,
A nickel sintered substrate is obtained through the above drying and sintering steps. If the slurry 16 is mainly composed of nickel hydroxide powder and prepared by adding a conductive material, a binder and the like to this, a paste type electrode plate can be continuously obtained through only the drying step.

[0022]

As described above, according to the present invention, the slurry is surely filled in the holes of the punching metal which is the core material contacting the reversing roller, and then the slurry is continuously applied to the outer surface of the punching metal. Moreover, air does not remain in the holes to form bubbles or cavities, and the electrode plate or the sintered substrate can be continuously manufactured with good productivity.

Further, from the aspect of the apparatus, the slurry coating part can be composed of a slurry storage container, a reversing roller and a slurry supply nozzle, and there is no need for a separate guide roller for filling the hole with the slurry. It is mechanically simple and its handling is easy.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a typical continuous manufacturing apparatus of a conventional electrode plate for an alkaline storage battery.

FIG. 2 is a diagram showing details of the slurry coating section.

FIG. 3 is a diagram showing details of a slurry coating portion in the present invention.

[Explanation of symbols]

 2 Punching metal 5 Pair of doctor knives 11 Metal base 12 Hole 14 Slurry storage container 15 Reversing roller 16 Slurry 17 Slurry supply nozzle 18 Slurry penetrating through hole 19 Control piece 20 Doctor knives 21 for pressing slurry 21 Projecting on the opposite side of the hole Slurry

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

Claims (5)

[Claims] 1. A strip-shaped long core made of punching metal is sent to a slurry storage container and a slurry application section which is composed of a reversing roller in which a part of the peripheral surface is immersed in the slurry in the container, and is fed to the reversing roller. When changing the moving direction by making contact with the roller, the pores of the core material are filled with the slurry supplied onto the roller, and then a certain amount of the slurry is applied to the outer surface of the core material in contact with the roller. After passing through the slurry coating portion, the slurry coating surface of the core material that moves in the rising direction is pressed with a doctor knife or a blade to apply a part of the slurry to the core material together with the slurry in the hole portion. A method for producing an electrode plate for an alkaline storage battery, which comprises extruding on the opposite surface and then passing a gap between a pair of doctor knives to apply slurry with a predetermined thickness on both left and right sides of the core material. 2. The method of manufacturing an electrode plate for an alkaline storage battery according to claim 1, wherein the slurry is a slurry for forming a nickel substrate, which is mainly composed of nickel powder and prepared by adding a binder thereto. 3. The method for producing an electrode plate for an alkaline storage battery according to claim 1, wherein the slurry is an active material slurry prepared mainly by adding nickel hydroxide powder to a conductive material. 4. The slurry supplied onto the reversing roller is supplied into the hole portion from the roller side when a long core material comes into contact with the roller, and the surplus portion passes through the hole portion and leaks to the outside. The method for producing an electrode plate for an alkaline storage battery according to claim 1. 5. A guide roller for feeding a strip-shaped long core made of punching metal to a slurry coating section, a slurry storage container for storing the slurry, and a moving direction of the core, a part of which enters the container. To a rising direction, a slurry supply nozzle for supplying the slurry onto the peripheral surface of the reversing roller above the slurry storage container, and the slurry coated on the outer surface of the core material inside the container to the roller circumference. A control piece for controlling a predetermined coating thickness between the surface and a doctor, and a doctor for pressing a slurry coating surface apart from the roller to push a part of the slurry through the hole of the core material to the opposite surface. A pair of blades that face the knife or blade with a predetermined gap, and pass the slurry-coated core material through the gap to control the slurry coating thickness on the left and right surfaces of the core material. Apparatus for producing an alkaline storage battery electrode plate comprising a Tanaifu.