JP2003142079A - Band-like body winding support reel and manufacturing method of electrode for storage battery using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support reel capable of forming an electrode plate with high productivity without hindering circulation of liquid and gas. SOLUTION: This support reel used for winding a band-like body is provided with a main shaft and a pair of support parts having a diameter larger than that of the main shaft, positioned at both ends of the main shaft and facing to each other. The support reel is characterized in that at least one of the pair of support parts is provided with a plurality of frames surrounding the vicinity of an end part of the main shaft in its circumferential direction and in the same plane, and a plurality of ribs disposed in respective regions partitioned by the frames and extending inward, and the number of the ribs located in at least one of the regions is larger than those of the ribs located in the regions inside that region.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support reel for winding a strip and a method for manufacturing an electrode for a storage battery using the same, and more particularly to a support reel for impregnating a sintered substrate.

[0002]

2. Description of the Related Art Conventionally, alkaline storage batteries have been widely used as various power sources, small batteries have been widely used for various portable electronic communication devices, and large batteries have been widely used for industrial purposes. In this type of alkaline storage battery, the positive electrode is almost always a nickel electrode. On the other hand, in the case of the negative electrode, in addition to cadmium, zinc,
Iron, hydrogen, etc. are used.

In the case of a cylindrical battery, a separator and a negative electrode are superposed on a nickel electrode and spirally wound, and the wound one is housed in a cylindrical battery case, and an electrolytic solution is injected into the case to store a storage battery. Is formed. Further, in the case of a prismatic battery, a separator and a negative electrode are superposed on the nickel electrode thus formed to form a laminate, which is housed in a prismatic battery case, and the electrolytic solution is placed in the case. A storage battery is formed by injection.

As a method of forming this nickel electrode or cadmium electrode, there are a sintering type and a non-sintering type.

In the latter, powders of compounds such as nickel and cadmium and various additive powders are blended, an organic binder is added thereto and kneaded to form a paste, which is filled in a porous nickel substrate and dried. Then, it is formed by pressing.

In the former sintered electrode, the conductive core material is applied with a slurry containing nickel powder and sintered.
This sintered substrate (sintered substrate) is formed by a method in which nickel hydroxide is deposited on the sintered substrate by alternately and repeatedly immersing the sintered substrate in a metal salt solution such as nickel nitrate and an alkaline solution. It

According to this method, when depositing an active material on a sintered substrate, a molten salt impregnating solution such as nickel nitrate having a high concentration is used at a high temperature to fill the nitrate, and then a drying and alkali treatment are performed. Is performed several times to precipitate the active material as a hydroxide.

In this method, as described above, a sintered substrate formed by applying a slurry containing nickel powder to the conductive core and sintering the conductive core is treated with a metal salt solution such as nickel nitrate and an alkali. It is necessary to alternately and repeatedly dip in the liquid to precipitate nickel hydroxide.

At this time, in order to improve productivity, Japanese Patent Laid-Open No. 51-
As shown in 70424, there has been proposed a method in which a sintered substrate is subjected to a series of steps of immersion, drying, alkali treatment, and water washing in a wound state. In this method, a large amount of processing is possible by winding a sintered substrate while maintaining a predetermined electrode plate spacing with a spacing member such as a spring made of stainless steel and impregnating the sintered substrate in a wound state. As shown in FIGS. 4 and 5, this support reel has support portions 12a and 12b arranged at both ends of the main shaft 11, respectively. Further, ribs 13 are radially arranged around the main shaft in these supporting portions, and the side ends of the wound sintered substrate 7 are formed by the ribs 1.
It is supported by 3. Normally, the support reel is used in a state in which the main shaft 11 stands upright.
Due to the partial support by the ribs 13, all the side edges of the wound sintered substrate do not come into contact with the support portion. As a result, damage to the end portion of the sintered substrate can be prevented, and even if the sintered substrate is immersed in the processing liquid, the circulation of the processing liquid is not hindered. However, in recent years, further large-scale processing has been required, and the width and length of the sintered substrate have been further promoted, which has become a necessity. As a result, the weight of the sintered substrate applied to the ribs increases, and especially the rib spacing increases in the outer peripheral portion of the holder, so that the sintered substrate deforms by its own weight and the circularity of the wound body cannot be maintained. Such problems have come to occur. As a result, the sintered substrates come into contact with each other, and the flow of liquid or gas at that portion deteriorates,
Contamination of the surface of the electrode plate and failure to perform uniform surface treatment have caused quality deterioration.

Therefore, in order to prevent the sintered substrates from contacting each other, the electrode plate support guide pieces are spirally fixed on the ribs extending radially from the bearing type flange portion at the center of the reel, and the strip-shaped sintered substrate is formed. A method has been proposed in which the distance between the electrode plate support guide pieces to be supported is widened at the winding start portion near the collar portion and narrowed at the winding end portion near the outer peripheral portion (Japanese Patent Laid-Open No. 11-213997).

[0011]

However, in such a method, since the winding pitch at the center of the winding body is increased, the winding length of the sintered substrate is reduced and the productivity improving effect is sufficiently exerted. However, there is a problem in that the distance between the sintered substrates is different between the outer peripheral portion and the inner peripheral portion of the wound body, and the liquid and gas are not evenly distributed.

On the other hand, if the mechanical strength of the support reel is to be increased, the ribs will be densely arranged, and there has been a problem that the flow of liquid and gas is obstructed during processing.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a support reel capable of forming an electrode plate with high productivity without obstructing the flow of liquid or gas.

[0014]

Therefore, in the support reel of the present invention, for winding a belt-shaped body, the main shaft and a pair of support parts that are larger in diameter than the main shaft and that are located at both ends of the main shaft and face each other are provided. A support reel, wherein at least one of the pair of support portions is arranged in a plurality of frames surrounding the end portion of the main shaft in the same plane in the circumferential direction thereof and in respective regions partitioned by the frames. And a plurality of ribs extending inwardly, wherein at least one rib in the area is arranged more than ribs in an area inside the area. By the way, since the support reel requires support strength and flowability, it is necessary to satisfy two contradictory requirements of strength retention and reduction of occupied area. That is, in order to meet the demand for higher support, it is necessary to increase the mechanical strength of the rib.On the other hand, in order to reduce the shielding property, the rib should be arranged so as not to obstruct the flow of liquid or gas, and Need to be thin.

Therefore, in the present invention, at least one of the pair of supporting portions located at both ends of the main shaft and facing each other has a plurality of frames surrounding the end portion of the main shaft in the same plane in the circumferential direction thereof, and those frames. A structure having a plurality of ribs arranged in each region partitioned by the frame and extending inward,
The ribs are arranged so as not to affect the strength and maintain the flow of liquid or gas. Further, since the structure has a structure in which there are few ribs in the inner peripheral area where the area area is further reduced and many ribs are arranged in the outer peripheral area where the area area is large, the mechanical strength on the outer peripheral side is increased, and the entire surface is uniform. It has a degree of mechanical strength.

Therefore, according to the support reel of the present invention, it is possible to support the belt-like body such as the sintered substrate constituting the winding body from the peripheral portion to the outer peripheral portion of the winding body while keeping the distance short. The wound body can maintain a shape close to a perfect circle throughout. On the other hand, since the ribs are not densely gathered more than necessary in the inner peripheral portion, the liquid and gas flow does not deteriorate. Therefore, it can be arranged so as not to block the passage of liquid or gas. As a result, the entire length of the wound body can be wound at the necessary minimum intervals, the maximum amount of processing that can be performed at one time can be performed, and productivity is dramatically improved. Further, it becomes possible to carry out a sufficiently uniform treatment.

Preferably, the rib is connected to the frame or the main shaft.

According to this structure, the rib and the frame support each other, and the mechanical strength can be further increased. Further, in terms of strength balance, it is desirable that the widths of the rib and the frame are approximately the same.

Preferably, the ribs are arranged at equal intervals in the region to which they belong.

According to this structure, since the ribs are arranged at equal intervals, the ribs have a uniform mechanical strength. Therefore, the outer circumference of the wound body is not deformed, and a perfect circle is formed. A close state can be maintained, a desired interval can be maintained, and productivity is dramatically improved.

According to the method of manufacturing an electrode for a storage battery of the present invention, a step of preparing the support reel having the above-described structure, a band-shaped sintered body being wound around the main shaft around the support reel, and a band-shaped sintered body. A winding step in which a side end of the body is supported by the frame and the rib is prepared, and the winding body is immersed in a treatment liquid, and the treatment liquid is supplied to a strip-shaped sintered body, And an impregnation step of impregnating the strip-shaped sintered body with.

According to this structure, since the support reel has a structure in which there are few ribs on the inner peripheral side where the area area is small and there are many ribs on the outer peripheral side where the area area is large, this support reel is The mechanical strength of the side is increased so that it has the same mechanical strength over the entire surface. Therefore, it is possible to maintain a shape close to a perfect circle as a whole while keeping the distance of the band-shaped sintered substrate constituting the wound body from the peripheral portion to the outer peripheral portion of the wound body short. On the other hand, since the ribs are not densely gathered more than necessary in the inner peripheral portion, it is possible to form an electrode substrate having a good surface state without deteriorating the flow of liquid or gas. Therefore, the entire length of the wound body can be wound at the minimum necessary intervals, and the maximum amount of processing that can be performed at one time can be performed, resulting in a dramatic improvement in productivity.

It is desirable that the ribs have an interval of 4 cm or more and 40 cm or less.

According to this structure, since the interval at which the sintered substrate is supported by the ribs is 4 cm or more and 40 cm or less, sufficient mechanical strength can be obtained in any region. Therefore, it is possible to maintain a state close to a perfect circle without causing deformation even on the outer peripheral side of the wound body, it is possible to maintain a desired interval, and the productivity is dramatically improved. If the distance between the adjacent ribs is smaller than 4 cm, the distance for blocking the passage of liquid or gas becomes small, so that it is not possible to perform a sufficiently uniform treatment. The barrier property is improved.

Preferably, the band-shaped body is a band-shaped sintered substrate, and is configured to be supplied with a processing liquid or a processing gas.

According to this structure, even when the treatment is performed with the treatment liquid or the treatment gas, the ribs that run in the direction perpendicular to the winding body are formed by the necessary amount, and the treatment liquid or the treatment gas is absorbed. It does not shut off.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION The impregnating support reel of the present invention will be described below. 1. Impregnation Support Reel (Example 1) This impregnation support reel is shown in FIG.
As shown in the lower surface of the support in FIG. 2, the outermost diameter is about 3
m is a structure having a height of 500 mm, and the main shaft 1 and the main shaft 1
A pair of support portions 2a, 2b that are made larger in diameter and are fixedly arranged in a vertical relationship with the spindle 1 at both ends of the spindle 1 and face each other.
With. At least one of the pair of supporting portions, in the present embodiment, the lower supporting portion 2a has a plurality of frames that surround the spindle 1 in the same plane in the circumferential direction in the circumferential direction and concentrically around the spindle 1. 4a, 4b, 4c, and a plurality of ribs 3, 3, 3 arranged in each region partitioned by those frames and extending inward. The ribs in the area are
More ribs are arranged than the ribs in the region inside the region. In this embodiment, the number of ribs is four in the innermost peripheral region, eight in the outer region adjacent thereto, and the outermost peripheral region. There are 24 in the side area. The ribs 3 arranged in the area defined by the innermost peripheral frame 4a are connected to the innermost peripheral frame 4a and the main shaft 1, and are arranged in the areas defined by the adjacent frames 4a and 4b or 4b and 4c. 3 is connected to the adjacent frames. The ribs 3 extend in the radial direction of the main shaft 1. Furthermore, the ribs 3 are arranged at equal intervals in the area to which they belong.

Each frame 4a, 4b, 4c has a radius of 2
It is an annular shape having 50 mm, 500 mm, 1500 mm and a width of 8 mm, and the width of the rib 3 is also 8 mm. The material of these frames and ribs is stainless steel. Then, the band-shaped sintered substrate is wound around the impregnating support reel to form a wound body.

(Embodiment 2) In the impregnating support reel according to the second embodiment of the present invention, as shown in the lower support portion 2a in FIG. 3, the innermost frame 4a is a square, and the outer frame thereof is a square. 4b is formed into a regular octagon, the outermost frame 4c is formed into a circular shape, and other portions are formed in the same manner as in the first embodiment.

Innermost frame 4a and outer frame 4b
Are formed so as to form a square and a regular octagon circumscribing circles having radii of 250 mm and 500 mm, respectively.
The radius of the outermost frame is 1500 mm. The band-shaped sintered substrate is wound around the impregnating support reel to form a wound body.

(Comparative Example) This supporting reel for impregnation is shown in FIG.
As shown in the overall view of FIG. 5 and the lower surface of the support portion in FIG. 5, the lower support portion 12 a is provided with an outer frame 15 arranged concentrically with the main shaft 11.
This is different from the first embodiment in that it has 16 ribs 13 extending radially from the main shaft 11 to the outer frame 15.

2. Formation of band-shaped sintered substrate This impregnating reel is obtained by sintering nickel powder on a conductive core material, and dipping this sintered body alternately and repeatedly in a metal salt solution such as nickel nitrate and an alkaline solution. It is used in a method of depositing nickel hydroxide on the sintered conductive core material.

First, a nickel powder is kneaded with a thickener such as carboxymethyl cellulose and water to prepare a slurry, and this slurry is applied to a conductive core made of a band of punching metal. After that, the conductive core coated with the slurry is sintered in a reducing atmosphere to have a porosity of about 80.
% Band-shaped sintered substrate was prepared.

3. Impregnation of Active Material Using the impregnating support reels of Examples 1 and 2 and Comparative Example, the sintered substrates prepared as described above are wound to form a wound body a1, a wound body b1, and a wound body. Formed body x1. At this time, the main shaft of the support reel was held in an upright position, and the side end of the wound sintered substrate was supported by the ribs or frames of the lower support. Next, the wound body was immersed in a solution containing a metal salt solute (a metal salt selected from nickel salt, cadmium salt, etc.) for a certain period of time, and then placed in a dryer to be dried. Further, a chemical impregnation operation of immersing the dried wound body in an alkaline aqueous solution and then washing with water was repeated several times to impregnate the wound sintered substrate with the active material.

Then, the sintered substrates were removed from the wound body a1, the wound body b1, and the wound body x1 to obtain strip-shaped active material-impregnated sintered substrates a, b and x, respectively.

4. Evaluation of Impregnation Reel For the nickel positive electrode plate thus formed, the nickel positive electrode plate using the impregnation reels of Examples 1 and 2 was not defective, and the nickel salt was deposited on the entire surface in a good surface condition. It is an electrode formed by. On the other hand, the nickel positive electrode plate formed using the impregnating reel of the comparative example,
Nickel salt is not sufficiently deposited inside, and there are many dirty areas on the surface.

5. Relationship between rib spacing and electrode plate defective site area Next, with respect to the active material-impregnated sintered substrates a and x, ribs formed at the side end portions of these substrates (shown by 7 in FIGS. 1 and 4) Based on the contact mark, the rib contact interval A and the area of each area divided as shown in FIG. 7 (width W of the substrate × A)
The ratio S (%) of the area of the defective portion to each of them was calculated, and the relationship of A to S is shown in FIG. Note that, in FIG. 6, S in the portion at the maximum rib contact interval is normalized to 100% and shown.

As is apparent from FIG. 6, in the active material-impregnated sintered substrate x formed by using the impregnating reel of the comparative example, the ratio of the defective portion area in the regions where the rib contact distance A is 4 cm or less and 40 cm or more. S has increased remarkably. On the other hand, in the active material-impregnated sintered substrate a produced by the supporting reel for impregnation of Example 1, since there is no region where the rib contact distance A is 4 cm or less and 40 cm or more, the ratio S of defective area is low. It is suppressed to. Although the active material-impregnated sintered substrate b produced by the impregnating support reel of Example 2 is not shown, the active material-impregnated sintered substrate a is shown.
It is known to give the same result as. As is clear from the above results, when the rib contact distance A is 4 cm or more and 40 cm or less, the defective portion area is extremely small, and a good active material-impregnated sintered substrate can be obtained.

In the case of using the impregnating support reel of the comparative example, when the length of the interval A is small, there is a problem that the flow of the liquid or the air is bad and the electrode plate surface has many defective portions.

When the supporting reel for impregnation of the comparative example is used, if the length of the interval A is long, it cannot be supported in terms of weight unless the winding density is lowered, and therefore it can be treated once. The length was small, and in this case also, there was a problem that workability was poor.

Therefore, according to the present invention, uniform work can be performed with good workability, and a highly reliable electrode plate can be formed with high productivity.

In the present invention, the impregnation of the band-shaped sintered substrate for a storage battery with the active material has been described, but this support reel is not limited to the use for winding the band-shaped sintered substrate for a storage battery, and the band-shaped sintered substrate is not limited thereto. It can be applied to various processing steps including a plating step on a metal foil or an etching step in a circuit pattern forming step on a film carrier.

[0043]

As described above, since the support reel of the present invention has a structure that does not affect the strength maintenance and the flow of liquid or gas as much as possible, the mechanical strength of the entire support surface is about the same. Has become.

Therefore, according to the support reel of the present invention, it is possible to support the belt-shaped body such as the sintered substrate constituting the winding body from the peripheral portion to the outer peripheral portion of the winding body while keeping the distance short. The wound body can maintain a shape close to a perfect circle throughout. On the other hand, since the ribs are not densely gathered more than necessary in the inner peripheral portion, the liquid and gas flow does not deteriorate. As a result, the entire length of the wound body can be wound at the minimum necessary intervals, and the productivity can be improved, and a sufficiently uniform treatment can be performed.

[Brief description of drawings]

FIG. 1 is an overall view showing an impregnating support reel according to a first embodiment of the present invention.

FIG. 2 is a bottom view showing the impregnating support reel according to the first embodiment of the present invention.

FIG. 3 is a bottom view showing the impregnating support reel according to the first embodiment of the present invention.

FIG. 4 is an overall view showing a conventional impregnating support reel.

FIG. 5 is a bottom view showing a conventional impregnating support reel.

FIG. 6 is a diagram showing the results of measuring the relationship between the distance A and the electrode plate surface defective site area when the impregnating support reels of Examples of the present invention and Comparative Examples are used.

FIG. 7 is an explanatory diagram showing a measurement region when measuring the relationship between the distance A in FIG. 6 and the electrode plate surface defective portion area.

[Explanation of symbols]

1 spindle 2a, 2b support 3 ribs 4a, 4b, 4c frame

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Eiji Okamoto             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Nobuo Maeda             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Tetsuya Hirochi             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Motonori Nishikubo             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. F-term (reference) 5H050 AA19 BA11 CA03 DA04 FA05                       FA14 GA09 GA13 GA30 HA04                       HA12

Claims (7)

[Claims] 1. A support reel for winding a strip-shaped body, comprising: a main shaft; and a pair of support parts which are larger in diameter than the main shaft and which are located at both ends of the main shaft and face each other. At least one includes a plurality of frames surrounding the end portion of the main shaft in the same plane in the circumferential direction thereof, and a plurality of ribs arranged in each region partitioned by the frames and extending inward. The number of ribs provided in at least one of the regions is larger than that of ribs provided in the region inside the region. 2. A rib arranged in a region defined by an innermost peripheral frame of the plurality of frames is connected to the innermost peripheral frame and the spindle, and is divided by adjacent frames of the plurality of frames. The support reel for winding a strip according to claim 1, wherein the ribs arranged in the different regions are connected to the adjacent frames. 3. The strip reel support reel according to claim 1, wherein the rib extends in a radial direction of the main shaft. 4. The support reel for winding a strip according to claim 3, wherein the ribs are arranged at equal intervals in a region to which the ribs belong. 5. The distance between adjacent ribs is 4 cm or more and 40c or more.
The support reel for winding a band according to claim 4, wherein the support reel is m or less. 6. A support reel comprising: a main shaft; and a pair of support parts which are larger in diameter than the main shaft and which are located at both ends of the main shaft and face each other. At least one of the pair of support parts is the above-mentioned support part. A plurality of frames surrounding the end portion of the main shaft in the same plane in the circumferential direction thereof, and a plurality of ribs arranged in each region partitioned by the frames and extending inward, at least one of the above The ribs in the area are prepared by preparing a support reel in which a larger number of ribs are arranged than the ribs in the area inside the area, and a belt-shaped sintered body is wound around the support reel around the spindle. And a winding step in which a side end portion of the strip-shaped sintered body is prepared by the frame and ribs to prepare a winding body, and the winding body is immersed in a treatment liquid, and the treatment liquid is formed into the strip-shaped sintered body. An impregnation step of supplying and impregnating the treatment liquid into the band-shaped sintered body Method for manufacturing a battery electrode, which comprises. 7. The distance between adjacent ribs is 4 cm or more 4
It is 0 cm or less, The manufacturing method of the electrode for storage batteries of Claim 6 characterized by the above-mentioned.