JP2000315498A - Manufacture of alkaline secondary battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce rate of failure by rolling, along the longitudinal direction, a long conductive substrate carrying a mix except for both ends along the longitudinal direction, welding a positive electrode lead with both ends along the longitudinal direction not carrying the mix, and cutting them in a desired length. SOLUTION: A long conductive substrate is rolled at a desired interval, a paste is charged, the paste adhered to the surface of a roller portion is removed with vacuum or a ultrasonic horn, and the substrate is dried to provide a conductive substrate 16 where a mix nonholding region 14 and a holding region 15 are alternately arranged longitudinally. This mix nonholding region 14 is cut along a dotted line orthogonal to the longitudinal direction, and the long conductive substrate having the holding region 15 carrying the mix other than both ends along the longitudinal direction and the mix nonholding region 14. This is formed in a hoop shape, rolled by passing it through a pair of rolling rolls with different rotation directions, and fed to a positive electrode lead welding means. A band-shaped metal plate as a positive electrode leas is welded with the mix nonholding region 14 and then the substrate is cut so as to have a standard size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing an alkaline secondary battery having an improved positive electrode.

[0002]

2. Description of the Related Art A nickel-hydrogen secondary battery, which is an example of an alkaline secondary battery, has a structure in which a separator is interposed between a positive electrode containing nickel hydroxide as an active material and a negative electrode containing a hydrogen storage alloy. , And an alkaline electrolyte are housed in a container.

The positive electrode is manufactured, for example, by a method described below. First, a paste is prepared by kneading a nickel hydroxide powder, a conductive material and a binder in the presence of water. On the other hand, both ends along the longitudinal direction of a long conductive substrate (for example, foamed metal) having a three-dimensional structure are rolled. The paste is filled in the conductive substrate. At this time, since the rolled ends have low porosity, the paste is applied only to the surface. Next, the paste adhered to the surfaces of the rolled both ends is removed and dried to obtain a conductive substrate having a structure in which the mixture is supported except for both ends along the longitudinal direction. The region where the mixture is not supported is formed because it is difficult to weld the positive electrode lead to the portion where the mixture is supported. Subsequently, the conductive substrate is cut into a desired size to obtain a conductive substrate having a structure in which the mixture is carried except for an end portion along the longitudinal direction. Rolling the conductive substrate; Thereafter, a positive electrode lead (for example, made of a strip-shaped metal plate) is welded to the above-mentioned end along the longitudinal direction where the mixture is not held, and a positive electrode tab (for example, made of a strip-shaped metal plate) is welded to the positive electrode lead. . Next, the positive electrode is manufactured by punching to a target size.

[0004]

However, when a positive electrode is manufactured by such a method, the positive electrode is cut into a size almost the same as that when it is incorporated into a battery after drying. Welding, welding and punching of the positive electrode tab must be performed separately. If each step is performed individually, an operation of transporting to the next step is required. In the transporting step, the mixture tends to fall off the conductive substrate. Dropout of the mixture causes a decrease in the capacity of the positive electrode and poor welding of the positive electrode lead. Therefore, there is a problem that the defect rate increases when there are many transport steps.

An object of the present invention is to provide a method for manufacturing an alkaline secondary battery in which the occurrence of a defective rate in the production of a positive electrode is reduced and the yield is improved.

[0006]

According to the present invention, there is provided a method of manufacturing an alkaline secondary battery, comprising: forming a conductive substrate on which a mixture is carried along a longitudinal direction except for both ends along the longitudinal direction; A positive electrode is produced by a method including a step of rolling, a step of welding positive electrode leads to both ends along the longitudinal direction in which the mixture is not carried, and a step of cutting the conductive substrate into desired dimensions. It is characterized by the following.

Another method of manufacturing an alkaline secondary battery according to the present invention is directed to a method for manufacturing a long-sized alkaline secondary battery, in which a mixture is supported at a desired interval, and a mixture holding region and a mixture non-holding region are provided in a longitudinal direction. Rolling a conductive substrate having a structure in which the conductive substrates are alternately arranged along a longitudinal direction, welding a positive electrode lead to the mixture non-holding region, and cutting the conductive substrate to a desired size. And producing a positive electrode by a method comprising the steps of:

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an alkaline secondary battery (cylindrical alkaline secondary battery) manufactured by a method according to the present invention will be described with reference to FIG.

An electrode group 5 produced by laminating a positive electrode 2, a separator 3, and a negative electrode 4 and winding them in a spiral shape is accommodated in a bottomed cylindrical container 1. The negative electrode 4 is arranged at the outermost periphery of the electrode group 5 and is in electrical contact with the container 1. The alkaline electrolyte is contained in the container 1. A circular first sealing plate 7 having a hole 6 in the center is arranged at the upper opening of the container 1. The ring-shaped insulating gasket 8 is
Is arranged between the periphery of the container and the inner surface of the upper opening of the container 1,
The sealing plate 7 is airtightly fixed to the container 1 via the gasket 8 by caulking to reduce the diameter of the upper opening inward. The positive electrode tab 9 has one end connected to the positive electrode 2 and the other end connected to the lower surface of the sealing plate 7. The positive electrode terminal 10 having a hat shape is provided on the sealing plate 7 with the hole 6.
It is attached to cover. Rubber safety valve 11
Is disposed so as to close the hole 6 in a space surrounded by the sealing plate 7 and the positive electrode terminal 10. A circular holding plate 12 made of an insulating material having a hole in the center is provided on the positive electrode terminal 10 with a protrusion of the positive electrode terminal 10.
Are arranged to protrude from the holes. The outer tube 13 covers the periphery of the holding plate 12, the side surface of the container 1, and the periphery of the bottom of the container 1.

Next, the positive electrode 2, the negative electrode 4, the separator 3
And the electrolyte will be described. 1) Positive electrode 2 This positive electrode is produced by the method (a) or (b) described below.

(A) Method for Producing First Positive Electrode (First Step) A paste is prepared by kneading a nickel hydroxide powder, a conductive material and a binder in the presence of water. On the other hand, a long conductive substrate is rolled at a desired interval. After filling the conductive substrate with the paste,
The paste adhering to the surface of the rolled portion of the conductive substrate is removed by, for example, a vacuum or an ultrasonic horn, and dried to form a mixture non-holding region 14 and a mixture holding region in the longitudinal direction as shown in FIG. Thus, a conductive substrate 16 having a structure in which the conductive substrates 15 and 15 are alternately obtained is obtained. By cutting the mixture non-holding region 14 of the conductive substrate 16 along a direction orthogonal to the longitudinal direction (a cutting line is indicated by a dotted line), as shown in FIG. 3, it is long and extends along the longitudinal direction. A conductive substrate 17 having a structure in which the mixture 15 is carried except for both end portions 14 is obtained.

As the nickel hydroxide powder, for example, a single nickel hydroxide powder or a nickel hydroxide powder in which a metal such as zinc, cobalt, bismuth or copper is eutectic can be used. In particular, the latter positive electrode containing nickel hydroxide powder can further improve the charging efficiency in a high-temperature state.

Examples of the conductive material include metallic cobalt, cobalt oxide, cobalt hydroxide and the like.

Examples of the binder include polyacrylates such as sodium polyacrylate and potassium polyacrylate, and fluorine-based resins such as polytetrafluoroethylene.
Alternatively, carboxymethyl cellulose and the like can be mentioned.

As the conductive substrate, for example, a conductive substrate having a two-dimensional structure (for example, a mesh-like porous metal body),
A conductive substrate having a three-dimensional structure (eg, a sponge-like (foamed), fibrous, or felt-like porous metal body);
A conductive substrate having a two-dimensional structure having a roughened surface can be given. It is preferable that at least the surface of the conductive substrate is made of nickel.

(Second Step) A conductive substrate 17 having a long structure and carrying a mixture 15 except for both end portions 14 along the longitudinal direction is formed into a hoop shape. Weld the positive lead. That is, the hoop-shaped conductive substrate 17 having the above structure is subjected to rolling by passing between a pair of rolling rolls 18a and 18b having different rotation directions. Note that the rolling direction is parallel to the longitudinal direction of the conductive substrate 17, as indicated by the arrow in FIG.
The conductive substrate 17 that has passed between the rolling rolls 18a and 18b is sent to the positive electrode lead welding means 19, and a band-shaped metal plate is welded to the non-mixture holding area 14 as a positive electrode lead.

The positive electrode lead may be formed, for example, from a strip-shaped nickel plate.

When a sponge-like porous metal body is used as the conductive substrate, it is desirable that the longitudinal direction of the conductive substrate and the direction in which the elongation at the time of rolling is reduced be parallel. That is, the conductive substrate made of a sponge-like porous metal body has a different elongation percentage during rolling depending on the rolling direction. After filling or applying the paste to the conductive substrate, the paste is dried and rolled, and when the elongation percentage of the conductive substrate is large, the thickness of the positive electrode becomes too thin, so that the amount of the paste in the positive electrode is insufficient. And the capacity is reduced. By setting the direction in which the elongation percentage during rolling is small to the longitudinal direction of the conductive substrate, the thickness of the positive electrode can be made appropriate, so that a high-capacity positive electrode can be obtained.

(Third Step) As shown in FIG. 5, a positive electrode lead 20 is welded to both ends along the longitudinal direction, and a conductive substrate 21 having a structure in which the mixture 15 is carried in other areas is provided with standard dimensions ( (Dimensions when assembled in a container) along the dotted line.

(Fourth Step) A positive electrode 2 having a structure as shown in FIG. 6 is manufactured by welding a positive electrode tab 22 to a positive electrode lead 20 of a conductive substrate cut to a standard size.

The positive electrode tab can be formed, for example, from a strip-shaped nickel plate.

(B) Method for Producing Second Positive Electrode (First Step) A paste is prepared by kneading nickel hydroxide powder, a conductive material and a binder in the presence of water. On the other hand, a long conductive substrate is rolled at a desired interval. After filling the conductive substrate with the paste,
The paste adhering to the surface of the rolled portion of the conductive substrate is removed by, for example, a vacuum or an ultrasonic horn, dried, and cut, so that the mixture 15 is long as shown in FIG. The conductive substrate 23 having a structure in which the mixture is held and the mixture non-holding regions 14 and the mixture holding regions 15 are alternately arranged in the longitudinal direction is obtained.

The nickel hydroxide powder, the conductive material,
As the binder and the conductive substrate, the first material described above is used.
And the same as those described in the method of manufacturing.

(Second Step) Rolling and welding of the positive electrode lead are performed on the conductive substrate 23 having the above-described structure using the above-described apparatus shown in FIG. That is, the hoop-shaped conductive substrate having the above structure is subjected to rolling by passing between a pair of rolling rolls having different rotation directions. Note that the rolling direction is parallel to the longitudinal direction of the conductive substrate 23, as indicated by the arrow in FIG. The conductive substrate that has passed between the rolling rolls is conveyed to positive electrode lead welding means, and the positive electrode lead is welded to the mixture non-holding area.

The same positive electrode lead as that described in the first manufacturing method can be used.

(Third Step) As shown in FIG. 8, the conductive substrate 24 having the structure in which the positive electrode leads 20 and the mixture holding regions 15 are alternately arranged in the longitudinal direction has a standard size (when the conductive substrate 24 is assembled in a container). (Dimensions) along the dotted line.

(Fourth Step) The positive electrode tab 22 having the structure shown in FIG. 6 is welded to the positive electrode lead 20 of the conductive substrate 24 cut to the standard size.
Is prepared.

The same positive electrode tab as that described in the first manufacturing method can be used.

In the first and second manufacturing methods described above, after the conductive substrate is partially rolled, the conductive substrate is filled or coated with the paste, and the paste adhered to the surface of the rolled portion is removed. The mixture non-holding area, which is the positive electrode lead welding means, was formed by removing the paste. However, the paste was filled or applied to the unrolled conductive substrate, and the paste was partially removed by ultrasonic vibration. An agent non-holding region may be formed.

2) Negative electrode 4 This negative electrode is kneaded with a negative electrode active material, a conductive agent, a binder, and water to prepare a paste, the paste is charged on a conductive agent substrate, dried, and then pressed and molded. It is manufactured by

Examples of the negative electrode active material include cadmium compounds such as metal cadmium and cadmium hydroxide, and hydrogen. Examples of the host matrix of hydrogen include a hydrogen storage alloy.

In particular, the hydrogen storage alloy is the cadmium
The capacity of the secondary battery can be improved
This is preferable. The hydrogen storage alloy is specially restricted
Instead of hydrogen generated electrochemically in the electrolyte.
Can store and release the stored hydrogen easily when released
Anything can be used. For example, LaNi_Five, MmNi _Five
(Mm is misch metal), LmNi_Five(Lm is La wealth
Misched metal), and a small amount of Ni in these alloys
At least multi-elements substituted with Al and Mn
Can be The multi-element hydrogen storage alloy described above is
In addition to Al and Mn as replacement elements for Ni, Co, T
i, Cu, Zn, Zr, Cr and at least one selected from B
Both may contain one kind of element. Among them, the general formula L
nNi_wCo_xAl_yMn_z(However, Ln is a rare earth element
Element and atomic ratio w, x, y, z are 3.30 ≦ w ≦
4.50, 0.50 ≦ x ≦ 1.10, 0.20 ≦ y ≦
0.50, 0.05 ≦ z ≦ 0.20 and their total value
Represents 4.90 ≦ w + x + y + z ≦ 5.50)
This is what you want.

[0033] Examples of the conductive agent include carbon black and graphite.

Examples of the binder include polyacrylates such as sodium polyacrylate and potassium polyacrylate, and fluorine-based resins such as polytetrafluoroethylene.
Alternatively, carboxymethyl cellulose and the like can be mentioned.

Examples of the conductive substrate include a two-dimensional substrate such as a punched metal and an expanded metal, and a three-dimensional substrate such as a felt-like metal porous body and a sponge-like metal porous body.

3) Separator 3 Examples of the separator 3 include a nonwoven fabric made of polyamide fiber, a nonwoven fabric made of polyolefin fiber such as polyethylene and polypropylene, or a nonwoven fabric provided with a hydrophilic functional group.

4) Alkaline Electrolyte As the alkaline electrolyte, for example, a mixed solution of sodium hydroxide (NaOH) and lithium hydroxide (LiOH),
A mixture of potassium hydroxide (KOH) and LiOH, KOH
And a mixed solution of LiOH and NaOH.

According to the method of manufacturing an alkaline secondary battery according to the present invention described above, a conductive substrate on which a mixture is supported is rolled along a longitudinal direction except for both ends along the longitudinal direction. By doing so, meandering of the conductive substrate and breakage of the conductive substrate due to a difference in elongation during rolling between the region where the mixture is supported and the region where the mixture is not supported can be prevented. . Next, by welding positive leads to both ends along the longitudinal direction where the mixture is not carried, since the conductive substrate does not meander during rolling, poor welding can be avoided.
Next, when the conductive substrate is cut into a desired size, a positive electrode can be obtained.

Therefore, the rolling and the welding of the positive electrode lead can be performed on the conductive substrate as it is, and the rolling and the welding of the positive electrode lead can be performed in a continuous process. . As a result, dropout of the mixture can be suppressed, so that the defective rate at the time of manufacturing the positive electrode can be reduced, and the yield can be improved.

Further, according to another method of manufacturing an alkaline secondary battery according to the present invention, the mixture is long, the mixture is supported at a desired interval, and is combined with the mixture holding region in the longitudinal direction. By rolling the conductive substrate having a structure in which the agent non-holding regions are alternately arranged along the longitudinal direction, the difference in elongation at the time of rolling between the region where the mixture is carried and the region where the mixture is not carried Therefore, meandering of the conductive substrate and breakage of the conductive substrate can be prevented. Then, by welding the positive electrode lead to the mixture non-holding region, since the conductive substrate does not meander during rolling, poor welding can be avoided. Next, when the conductive substrate is cut into a desired size, a positive electrode can be obtained.

Accordingly, the rolling and the welding of the positive electrode lead can be performed on the conductive substrate as it is, and the rolling and the welding of the positive electrode lead can be performed in a continuous process. . As a result, dropout of the mixture can be suppressed, so that the defective rate at the time of manufacturing the positive electrode can be reduced, and the yield can be improved.

[0042]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

Example 1 <Preparation of Positive Electrode> The width was 500 mm and the area density was 400 to 5
A long nickel foam plate having a thickness of 1.0 to 1.5 mm at 00 g / m ² was prepared as a conductive substrate having a three-dimensional structure. The compressed section having a thickness of 0.2 mm was formed by rolling the nickel foam sheet at desired intervals.

On the other hand, a binder (0.2 parts by weight of sodium polyacrylate powder and a dispersion of polytetrafluoroethylene) was added to a mixed powder comprising 90 parts by weight of nickel hydroxide powder and 5.5 parts by weight of cobalt monoxide powder. The mixture was mixed with 28 parts by weight of water to prepare a paste. Subsequently, this paste was filled into the foamed nickel plate,
The paste adhering to the surface of the compression section is removed by an ultrasonic horn and dried to carry the mixture at a desired interval as shown in FIG. A foamed nickel plate having a structure in which the agent non-holding regions were alternately arranged was obtained.

By cutting the mixture non-holding area of the nickel foam plate along a direction perpendicular to the longitudinal direction, the mixture is carried except for both ends along the longitudinal direction as shown in FIG. Thus, a foamed nickel plate having a bent structure was obtained.

The obtained nickel foam sheet is wound into a hoop shape, rolled to a thickness of 0.6 mm by passing between the rolling rolls of the apparatus shown in FIG. 4, and then sent to a positive electrode lead welding means. A strip-shaped nickel plate having a width of 2 mm was continuously seam-welded to the agent non-holding region as a positive electrode lead. The length of the foamed nickel plate is 1 in terms of the number of positive electrodes.
This is equivalent to 0000 sheets. At the time of welding, there was no stoppage of the welding machine, and there was no positive electrode that caused poor welding.

The welded long nickel foam plate is cut into an AAA size, and a positive electrode tab made of a strip-shaped metal plate is welded to the positive electrode lead, thereby obtaining the structure shown in FIG. 10,000 positive electrodes were produced. When the obtained 10,000 positive electrodes were inspected for chipping or breakage, none of the positive electrodes had chipping or breakage.

<Preparation of Negative Electrode> A binder composed of 1.5% by weight of polytetrafluoroethylene, 0.5% by weight of sodium polyacrylate, and 0.12% by weight of carboxymethylcellulose was added to 100% by weight of a hydrogen storage alloy powder. A paste was prepared by adding and mixing 1% by weight of carbon black and 50% by weight of water as conductive agents. This paste was applied to punched metal, dried, and then pressed to form a negative electrode.

Next, a separator made of a nonwoven fabric made of a polypropylene fiber subjected to hydrophilic treatment was interposed between the positive and negative electrodes, and spirally wound to form an electrode group. After this electrode group was housed in a cylindrical container having a bottom, an alkali electrolyte composed of 7N potassium hydroxide and 1N lithium hydroxide was housed in the container, and the container was sealed and the like. The theoretical capacity with the structure shown is about 520m
At Ah, an AAA size cylindrical nickel-metal hydride secondary battery was assembled.

Example 2 A cylindrical nickel-metal hydride secondary battery was assembled in the same manner as in Example 1 except that a positive electrode was manufactured by the method described below.

The width is 500 mm and the areal density is 400 to 50.
A long nickel foam plate of 0 g / m ² and a thickness of 1.0 to 1.5 mm was prepared as a conductive substrate having a three-dimensional structure. The compressed section having a thickness of 0.2 mm was formed by rolling the nickel foam sheet at desired intervals.

The paste similar to that described in the first embodiment is filled in the nickel foam plate, the paste attached to the surface of the compression section is removed by an ultrasonic horn, and the mixture is dried. A foamed nickel plate having a structure supported at a desired interval was obtained.

By cutting the nickel foam plate, a long mixture is supported at a desired interval as shown in FIG. A foamed nickel plate having a structure in which the holding regions were alternately arranged was obtained.

The obtained nickel foam sheet is wound into a hoop shape, rolled to a thickness of 0.6 mm by passing between the rolling rolls of the apparatus shown in FIG. 4, and then sent to a positive electrode lead welding means. A strip-shaped nickel plate having a width of 2 mm was continuously seam-welded to the agent non-holding region as a positive electrode lead. The length of the foamed nickel plate is 1 in terms of the number of positive electrodes.
This is equivalent to 0000 sheets. At the time of welding, there was no stoppage of the welding machine, and there was no positive electrode that caused poor welding.

The welded long nickel foam plate is cut into an AAA size, and a positive electrode tab made of a strip-shaped metal plate is welded to the positive electrode lead to obtain the structure shown in FIG. 10,000 positive electrodes were produced. When the obtained 10,000 positive electrodes were inspected for chipping or breakage, none of the positive electrodes had chipping or breakage.

Comparative Example 1 <Preparation of Positive Electrode> The width was 500 mm and the area density was 400 to 5
A long nickel foam plate having a thickness of 1.0 to 1.5 mm at 00 g / m ² was prepared as a conductive substrate having a three-dimensional structure. The compressed section having a thickness of 0.2 mm was formed by rolling the nickel foam sheet at desired intervals.

The same paste as described in the first embodiment is filled in the foamed nickel plate, and the paste adhered to the surface of the compression section is removed by an ultrasonic horn and dried to dry the powder. As shown in FIG. 2, a mixture was supported at a desired interval, and a nickel foam plate having a structure in which mixture holding regions and mixture non-holding regions were alternately arranged in the longitudinal direction was obtained.

By cutting the mixture holding area of the nickel foam plate, the nickel foam plate 26 having a long length and a structure in which the mixture 15 is carried except for the central portion 25 as shown in FIG. Obtained.

The obtained nickel foamed sheet was wound into a hoop shape and rolled to a thickness of 0.6 mm by passing between the rolling rolls of the apparatus shown in FIG. 4 described above. Distortion and wrinkles were generated in the holding area, making it difficult to weld the positive electrode lead, and a positive electrode could not be obtained.

Comparative Example 2 <Preparation of Positive Electrode> The width was 500 mm and the area density was 400 to 5
A long nickel foam plate having a thickness of 1.0 to 1.5 mm at 00 g / m ² was prepared as a conductive substrate having a three-dimensional structure. The compressed section having a thickness of 0.2 mm was formed by rolling the nickel foam sheet at desired intervals.

The paste similar to that described in the first embodiment is filled in the foamed nickel plate, and the paste adhering to the surface of the compression section is removed with an ultrasonic horn and dried to form a mixture. A foamed nickel plate having a structure supported at a desired interval was obtained.

The foamed nickel plate was cut into a desired size to obtain 10,000 foamed nickel plates having a structure in which the mixture was carried except for the end portions along the longitudinal direction.

Each of the obtained nickel foam sheets was subjected to a roller press. Next, it was placed on a transport carrier and transported to a welding machine, and a 2 mm-wide band-shaped nickel plate was seam-welded as a positive electrode lead to the mixture non-holding region of each foamed nickel plate. Since the mixture was broken, the mixture was missing, or the mixture was dropped, welding failure occurred due to the mixture dropped in 1000 of the sheets.

For those having no poor welding, a positive electrode tab made of a band-shaped metal plate is welded to the positive electrode lead to obtain the positive electrode having the structure shown in FIG.
Were produced. A cylindrical nickel-metal hydride secondary battery was assembled in the same manner as in Example 1 except that this positive electrode was used.

With respect to the obtained secondary batteries of Examples 1 and 2 and Comparative Example 2, 1.5 C.
After charging for 1 hour, the terminal voltage is 1.0 V at 1 CmA current
When the discharge capacity at the time of discharge until the battery capacity was measured, the secondary battery of Example 1 was about 550 mAh, the secondary battery of Example 2 was about 550 mAh as in Example 1, and the comparative example 2
Was about 550 mAh, and the secondary batteries of Examples 1 and 2 had the same discharge capacity as the secondary battery of Comparative Example 2.

In the above-described embodiment, the separator is interposed between the positive electrode and the negative electrode and spirally wound and accommodated in a bottomed cylindrical container. It is not limited to a simple structure. For example, the present invention is similarly applicable to a square nickel-metal hydride secondary battery in which a separator is interposed between a positive electrode and a negative electrode, and a laminate of a plurality of the separators is housed in a bottomed rectangular cylindrical container.

[0067]

As described above, according to the present invention, it is possible to provide a method of manufacturing an alkaline secondary battery in which the number of defects occurring during the manufacture of the positive electrode is reduced and the yield is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an alkaline secondary battery manufactured by a method according to the present invention.

FIG. 2 is a process chart showing a method for manufacturing an alkaline secondary battery according to the present invention.

FIG. 3 is a process chart showing a method for manufacturing an alkaline secondary battery according to the present invention.

FIG. 4 is a schematic view showing an apparatus used in the method for producing an alkaline secondary battery according to the present invention.

FIG. 5 is a process chart showing a method for manufacturing an alkaline secondary battery according to the present invention.

FIG. 6 is a plan view showing a positive electrode manufactured by the method according to the present invention.

FIG. 7 is a process chart showing a method for manufacturing an alkaline secondary battery according to the present invention.

FIG. 8 is a process chart showing a method for manufacturing an alkaline secondary battery according to the present invention.

FIG. 9 is a process chart showing a manufacturing method for the secondary battery of Comparative Example 2.

[Explanation of symbols]

 17: conductive substrate 18a, 18b: rolling roller 19: positive electrode lead welding means

Continued on the front page F-term (reference) 5H016 AA05 AA08 BB04 BB05 BB08 CC09 HH15 5H028 AA01 AA05 BB04 BB05 CC08 CC10 CC11

Claims (2)

[Claims] 1. A step of rolling along a longitudinal direction a conductive substrate on which a mixture is carried except for both ends which are long and along the longitudinal direction, and along a longitudinal direction on which the mixture is not carried. A method for manufacturing an alkaline secondary battery, comprising: preparing a positive electrode by a method including a step of welding positive electrode leads to both ends and a step of cutting the conductive substrate into a desired size. 2. A conductive substrate having a long structure in which a mixture is carried at a desired interval and a mixture holding region and a mixture non-holding region are alternately arranged in a longitudinal direction. Rolling along the longitudinal direction; welding a positive electrode lead to the mixture non-holding region; and cutting the conductive substrate to a desired size to produce a positive electrode. A method for manufacturing an alkaline secondary battery.