JP2002063897A - Manufacturing method of alkaline battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-quality alkaline battery which can prevent falling-off of active materials by increasing adhesive strength onto a core body of an active material layer on an opposite side, where an active material layer is scraped off. SOLUTION: Hydrogen storage alloy slurry obtained by adding hydrogen storage alloy powder 12a to polyethylene oxide(PEO) powder as a binder 12b and a suitable amount of water (solvent for the binder) and kneading them is applied on both sides of a metal core body (active material holder) 11 made of punching metal, and then dried. Furthermore, after an active material layer 13 is removed from the core body 11 with a means such as cutting, a prescribe amount of water (solvent for the binder) is sprayed on the cut face (expose face of the core body 11) to adhere water, and then is dried, to obtain a hydrogen storage alloy electrode 10 arranged on the outermost side of an electrode group.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an alkaline storage battery having an electrode group in which a positive electrode plate and a negative electrode plate are laminated with a separator interposed therebetween, and more particularly to a method for manufacturing an electrode core disposed on the outermost side of the electrode group. The present invention relates to a method for manufacturing an alkaline storage battery in which a body is exposed and the exposed core body is housed in contact with a metal outer can.

[0002]

2. Description of the Related Art In recent years, demand for secondary batteries (storage batteries) that can be charged and discharged has increased with the increase in small portable devices.
In particular, as devices become smaller, thinner, and more space efficient,
The demand for nickel-hydrogen storage batteries, which can provide large-capacity storage batteries, has increased rapidly. This type of nickel-metal hydride battery is
As shown in FIG. 3, an electrode group 50a in which a positive electrode plate 51 using nickel hydroxide as an active material and a negative electrode plate 52 using a hydrogen storage alloy as an active material are laminated with a separator 53 interposed therebetween is used for alkaline electrolysis. The nickel-hydrogen storage battery 50 is housed in a metal outer can (battery case) 55 together with the liquid, and the metal outer can 55 is sealed. The negative electrode plate 52 is formed by applying an active material slurry made of a hydrogen storage alloy to both surfaces of a core 52a holding an active material.

A nickel-hydrogen storage battery 5 having such a structure
In the case of 0, there is a problem that oxygen gas generated when the positive electrode plate 51 is fully charged passes through the separator 53 and diffuses into the negative electrode plate 52, so that the negative electrode plate 52 is significantly deteriorated. In particular, the active material layer 52b of the negative electrode plate 52 that does not face the positive electrode plate 51, that is, the active material layer 52b of the negative electrode plate 52 that is disposed on the outermost side of the electrode group 50a that faces the metal outer can 55 is significantly deteriorated. . This is because the active material layer 52b of the negative electrode plate 52 disposed on the outermost side of the electrode group 50a does not face the positive electrode plate 51, and therefore, during charging, the negative electrode plate 52
This is due to the fact that the progress of the charging reaction is delayed.
For this reason, when the positive electrode plate 51 is fully charged and oxygen gas is generated, it receives an oxygen attack in a state where the amount of hydrogen absorbed is smaller than that of the negative electrode plate 52 disposed in the middle, and the deterioration is extremely large. And the cycle characteristics of the battery deteriorate.

The active material layer 52b of the outermost negative electrode plate 52 that does not face the positive electrode plate 51 is a region of low electrochemical activity that does not make hydrogen storage and release reactions efficient during charging and discharging. Therefore, the active material layer is not substantially used effectively. The formation of a region in which the active material is not effectively used inside the battery case 55 has a disadvantage of lowering the volume energy density which is extremely important for the battery. In particular,
Nickel-hydrogen storage batteries are designed so that the negative electrode plate absorbs oxygen gas to form a sealed structure, so that the negative electrode plate has a larger electrode plate capacity than the positive electrode plate. The energy density will drop considerably.

Therefore, as shown in FIG. 4, an electrode group 60a in which a positive electrode plate 61 and a negative electrode plate 62 are laminated via a separator 63 is housed and arranged in a battery case 65.
An active material is applied to a side of the negative electrode plate 62 disposed on the outermost side of the electrode group 60a facing the positive electrode plate 61, and an active material is applied to a side not facing the positive electrode plate 61 but facing the battery case 65. A nickel-hydrogen storage battery 60 in which the core exposed surface 62b is formed without being present has been proposed in Japanese Patent Application Laid-Open No. H10-255834. With such a configuration, the amount of the active material of the negative electrode plate 62 disposed on the outermost side of the electrode group 60a is half that of the intermediate negative electrode plate 62 disposed between the positive electrode plates. It becomes smaller than the board capacity.

Since the outermost side of the electrode group and the side facing the battery case do not face the positive electrode plate, the area becomes electrochemically low in activity and does not efficiently perform the hydrogen storage / release reaction. However, as described above, the nickel-hydrogen battery 60 in which the core exposed surface 62b is formed without the active material layer on the outermost side of the electrode group is disposed between the positive electrode plates 61. Since the active material can be distributed and added to the intermediate negative electrode plate 62, it is possible to prevent a portion that is not effectively used from being formed, thereby preventing a reduction in volume energy density.

The nickel-hydrogen battery 60 in which the core exposed surface 62b is formed without the active material layer on the outermost side of the electrode group as described above, Since 62a functions as a metal cover that covers the electrode group 60a, the electrode group 60a can be easily inserted into the battery case 65, and the active material can be effectively prevented from falling off. This is because the core body 62a acting as a metal cover is a conductive plate material such as punched metal, so that when the electrode group 60a is inserted into the battery case 65, the outermost active material of the electrode group 60a is peeled off. This is because it does not occur that it falls off. Further, since the core body 62a can be brought into direct electrical contact with the inner surface of the battery case 65, the high-rate discharge characteristics can be improved.

[0008]

By the way, in order to manufacture an electrode having such a core exposed surface, an active material slurry is applied to a side which becomes the core exposed surface when the active material slurry is applied to the core. And a method in which the active material slurry is applied to both surfaces of the core, and then the active material applied to the exposed side of the core is removed.

[0009] Here, when the core is formed with a portion where the active material slurry is applied to both surfaces and a portion where only one surface is coated with the active material slurry, the core-exposed surface is previously determined. If a method is adopted in which the active material slurry is not applied to the part, the two-sided coated part (the whole thickness is thick) is rolled during rolling, but the one-side coated part (the whole thickness is thin) is not rolled. This caused a problem that productivity was reduced. On the other hand, in the method in which the active material slurry is applied to both surfaces of the core and then the active material applied to the exposed side of the core is removed, the entire thickness is uniform because the entire thickness is uniform. Rolling does not cause the above problems.

However, after the active material slurry is applied, the active material applied to the exposed side of the core is removed. In this method, after drying and rolling, the active material is formed to form the exposed core. The active material is removed by shaving off the active material layer on one side to which the active material has been applied, such as by applying a blade to the layer. For this reason, it is troublesome to scrape off the hardened active material layer after drying, and the adhesive strength to the core of the active material layer on the opposite side from which the active material layer has been shaved is insufficient. There is a problem that the quality is deteriorated due to the falling off of the steel.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to increase the adhesive strength to the core of the active material layer on the opposite side from which the active material layer has been shaved off. An object of the present invention is to provide a high-quality alkaline storage battery by preventing a substance from falling off.

[0012]

Means for Solving the Problems and Action / Effect thereof To achieve the above object, a method for manufacturing an alkaline storage battery according to the present invention is directed to an active material comprising an active material, a binder and a solvent for the binder on both surfaces of a core. A coating step of coating the slurry, a drying step of drying the electrode coated with the active material slurry, an active material removal step of removing the active material on the side forming the exposed surface of the core, And a solvent adhering step of adhering the solvent of the binder from the exposed surface side.

When the electrode coated with the active material slurry is dried, when the electrode is dried (in this case, the temperature of the drying is increased to increase the productivity), the binder contained in the active material layer is moved with the movement of water contained in the active material layer. The (binder added in the active material slurry) moves to the electrode surface (dry surface side) and solidifies, and the amount of the binder in the active material layer near the core disposed at the center of the electrode decreases. . For this reason, the adhesive force between the core and the active material is reduced, and the active material is easily dropped.

However, as in the present invention, when a binder solvent (for example, water in the case of a water-soluble binder) is adhered from the exposed surface side of the core, a large number of holes formed in the core are formed. The binder solvent passes through, the binder solvent penetrates into the active material layer that is not removed,
The solidified binder is redissolved, and the concentration of the binder near the core increases. After that, when the substrate is dried (in this case, drying is performed at room temperature and the temperature is low), the adhesive force between the core and the active material in the vicinity of the core becomes strong, so that the active material layer in the vicinity of the core becomes difficult to peel off. As a result, the fall of the active material can be prevented.

Further, the method for manufacturing an alkaline storage battery of the present invention comprises a coating step of coating an active material slurry comprising an active material, a binder and a solvent of the binder on both surfaces of a core, A drying step of drying the formed electrode, a solvent adhering step of adhering a binder solvent from the active material layer side on which the exposed surface of the core is formed, and removing the active material on the side forming the exposed surface of the core. An active material removing step is provided.

As described above, when a binder solvent (for example, water in the case of a water-soluble binder) is adhered from the active material layer side on which the exposed surface of the core is formed later, the solvent of the binder is Along with the diffusion to the vicinity, a part of the diffused solvent passes through a large number of openings formed in the core body and permeates into the active material layer that is not removed. Then, at the time of drying (the drying in this case is a high temperature to increase productivity), the surface of the electrode (dry surface side) is accompanied by the movement of moisture.
And the binder solidified is redissolved and diffuses to the vicinity of the core. After that, when drying is performed (in this case, drying is performed at room temperature and the temperature is low), the binder diffused to the core is solidified, so that the adhesion between the core and the active material layer becomes strong, The active material layer near the body is less likely to peel off.

Thus, even if the active material on the side where the solvent of the binder is adhered is later removed, the active material in the vicinity of the core of the active material layer which has not been removed can be maintained in a state of being firmly fixed to the core. As a result, the fall of the active material can be prevented. In this case, if the electrode to which the solvent of the binder is attached is performed in an undried state after the solvent attaching step in the active material removing step, the active material layer in the removed portion is softened, so that the active material is easily removed. Can be removed, and the work of removing the active material is facilitated.

When a solution containing a binder (a binder and a solvent for the binder) is allowed to adhere to the exposed surface of the core in the solvent adhering step, the solution containing the binder contains a large number of holes formed in the core. It penetrates into the active material layer which is not removed through. In addition, when the solution containing the binder is attached to the active material layer on the side forming the exposed surface of the core, the solution diffuses to the vicinity of the core, and a part of the diffused solution is formed in a large number of holes perforated in the core. And penetrates into the active material layer which is not removed. This increases the content of the binder in the active material layer near the core, so that the core and the active material near the core are more firmly fixed. As a result, the active material can be prevented from peeling off from the core, and the active material can be further prevented from falling off.

In order to allow a predetermined amount of a solvent of a binder or a solution containing a binder to adhere to the exposed surface of the core or the active material layer on the side forming the exposed surface of the core, the solvent of the binder is required. Alternatively, it is desirable to apply a solution containing a binder by spraying. Further, in general, a metal outer can also serves as a negative electrode external terminal, so that a hydrogen storage alloy capable of electrochemically storing and releasing hydrogen is used as an electrode forming an exposed surface of the core. It is desirable that the material is a hydrogen storage alloy electrode.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a hydrogen storage alloy electrode will be described below with reference to FIGS. FIG. 1 is an enlarged cross-sectional view schematically showing a state in which an active material is attached around a hole formed in a core (punched metal) of an electrode. FIG. FIG. 1B is a cross-sectional view illustrating an electrode according to a second embodiment, FIG. 1C is a cross-sectional view illustrating an electrode according to a third embodiment, and FIG. It is sectional drawing which shows the electrode of a comparative example. FIG. 2 is a perspective view schematically showing a state in which a grid-like kerf is formed in the active material layer in order to perform a drop test of the active material.

1. Preparation of hydrogen storage alloy powder Commercially available metal elements (Mm Ni _3.4 Co _0.8 Al _0.2 Mn _0.6 (Mm is a misch metal))
m, Ni, Co, Al, Mn) are weighed and mixed. This was put into a high-frequency melting furnace to be melted, poured into a mold, cooled, and cooled to MmNi _3.4 Co _0.8 Al _0.2 Mn _0.6.
(Ingot) of a hydrogen storage alloy composed of
The lump of the hydrogen storage alloy was roughly pulverized, and then mechanically pulverized in an inert gas atmosphere until the average particle diameter became about 50 μm to prepare a hydrogen storage alloy powder.

2. Production of hydrogen storage alloy electrode (1) Example 1 99 mass% of hydrogen storage alloy powder produced as described above
Then, polyethylene oxide (PEO) powder as a binder is added with 1% by mass based on the mass of the hydrogen storage alloy powder, and an appropriate amount of water (solvent of the binder (PEO)) is added and kneaded, and the mixture is kneaded. A slurry was prepared. Next, a hydrogen-absorbing alloy slurry is applied to both surfaces of a metal core (active material holding body) 11 made of a punching metal having a surface provided with an opening 11a by nickel plating, and the active material layers 12 and 13 are coated. Was formed on the active material-coated electrode. Thereafter, the electrode was dried (for example, at 60 ° C. for 20 minutes), and was rolled to a thickness of 0.6 mm to obtain a dry rolled electrode 10. The amount of the hydrogen storage alloy slurry applied was adjusted so that the density of the hydrogen storage alloy after rolling was 5 g / cm ³ .

Next, after the active material layer 13 on one side of the obtained dry rolled electrode 10 is removed from the core body 11 by cutting or the like, a predetermined amount (for example, from the cut surface (exposed surface of the core body 11) side) Water (a solvent of a binder (PEO)) was sprayed in such an amount that the cut surface was moistened to adhere water to the cut surface. Thereafter, the electrode was dried (for example, left at room temperature (about 25 ° C.) for 30 minutes) to produce the hydrogen-absorbing alloy electrode 10 of Example 1 disposed on the outermost side of the electrode group.

When water is adhered to the cutting surface, FIG.
As shown in (a), attached water (solvent of binder)
Passes through a number of apertures 11a drilled in the core body 11,
Water permeates the active material layer 12 near the core 11. As a result, the binder 12 b solidified in the active material layer 12 is redissolved and diffuses to the vicinity of the core 11. The remelted binder 12b is solidified by drying, so that the core 11 and the active material particles 12a are firmly fixed, and the active material particles 12a, 12a are also firmly fixed to each other.

(2) Example 2 After preparing a hydrogen storage alloy slurry in the same manner as in Example 1 described above, the surface was plated with nickel to form openings 21a.
A hydrogen storage alloy slurry was applied to both surfaces of a metal core (active material holding member) 21 made of a punching metal provided with the above, thereby forming an active material coated electrode in which active material layers 22 and 23 were formed. After this, it is dried (for example, at 60 ° C. for 20 minutes),
Rolled to a thickness of 0.6 mm and dried and rolled electrode 2
0 was set. The amount of the hydrogen storage alloy slurry applied was adjusted so that the density of the hydrogen storage alloy after rolling was 5 g / cm ³ .

Next, after the active material layer 23 on one side of the obtained dry rolled electrode 20 is removed from the core 21 by a means such as cutting, a predetermined amount (for example, from the cut surface (exposed surface of the core 21)) 0.5% of PEO)
An aqueous solution (a binder (PEO) and a solvent for the binder) was sprayed to adhere the aqueous solution of PEO to the cut surface. Thereafter, drying (for example, leaving at room temperature (about 25 ° C.) for 30 minutes)
In this way, a hydrogen storage alloy electrode 20 of Example 2 disposed outside the electrode group was produced.

When a 0.5% aqueous solution of PEO is adhered to the cut surface, as shown in FIG.
The aqueous solution of O passes through a large number of openings 21 a formed in the core 21, and the aqueous solution of PEO permeates the active material layer 22 near the core 21. Thereby, the binder 22 b solidified in the active material layer 22 is redissolved and diffuses to the vicinity of the core 21. By drying the re-dissolved binder 22b, the core 21 and the active material particles 22a are more firmly fixed, and the active material particles 22a, 22a are also more firmly fixed.

(3) Embodiment 3 A hydrogen-absorbing alloy slurry was prepared in the same manner as in Embodiment 1 described above, and the surface was plated with nickel to form an opening 31a.
A hydrogen storage alloy slurry was applied to both surfaces of a metal core (active material holding body) 31 made of a punching metal provided with the above, thereby forming an active material coated electrode in which active material layers 32 and 33 were formed. After this, it is dried (for example, at 60 ° C. for 20 minutes),
Rolled to a thickness of 0.6 mm and dried and rolled electrode 3
0 was set. The amount of the hydrogen storage alloy slurry applied was adjusted so that the density of the hydrogen storage alloy after rolling was 5 g / cm ³ .

Next, a predetermined amount of water (for example, an amount that makes the surface of the active material layer 33 wet) is placed on the active material layer (the active material layer which is later cut and removed) 33 of the obtained dry rolled electrode 30. (Solvent of binder (PEO)) was sprayed to attach water to the active material layer 33. Thereafter, the active material layer 33 is removed from the core body 31 by means such as cutting, and the cut surface (core body 3) is removed.
1 (exposed surface) and then dried (for example, at room temperature (about 2
(5 ° C.) for 30 minutes to produce a hydrogen-absorbing alloy electrode 30 of Example 3 disposed on the outermost side of the electrode group.

When water is contained in the active material layer 33,
Since the active material layer 33 becomes soft, the cutting operation is facilitated if cutting is performed before the contained moisture is dried. When the exposed surface of the core body 31 is formed by removing the active material layer 33 containing water, the water attached to the active material layer 33 diffuses into the active material layer 33 as shown in FIG. As a result, a part of the diffused water passes through a large number of openings 31a formed in the core body 31 and diffuses and penetrates into the active material layer 32 as well. Thereby, the binder 32b solidified in the active material layer 33 and the active material layer 32 is redissolved and diffused into the active material layers 33 and 32. As a result, the core 31 and the active material particles 32a are firmly fixed during drying, and
The active material particles 32a also firmly adhere to each other.

(4) Comparative Example On the other hand, after preparing a hydrogen-absorbing alloy slurry in the same manner as in Example 1 described above, a metal core body made of a punched metal having a surface provided with an opening 41a plated with nickel. (Active material holding member) 41 was coated with a hydrogen storage alloy slurry on both surfaces to form active material coated electrodes in which active material layers 42 and 43 were formed. Thereafter, drying (for example, at 60 ° C. for 20 minutes)
It rolled so that thickness might be set to 0.6 mm, and it was set as the dry rolled electrode 40. The amount of the hydrogen storage alloy slurry applied was adjusted so that the density of the hydrogen storage alloy after rolling was 5 g / cm ³ . Next, the active material layer 43 of the dry rolled electrode 40 is removed from the core body 41 by means such as cutting, and the hydrogen storage alloy electrode 4 of the comparative example disposed on the outermost side of the electrode group is removed.
0 was produced.

3. Strength Test of Hydrogen Storage Alloy Electrode Then, the hydrogen storage alloy electrodes 10, 20, and 30 of Examples 1, 2, and 3 and the hydrogen storage alloy electrode 40 of the comparative example, which were manufactured as described above, were each used by ten. , Active material layers 12, 22, of each of these electrodes 10, 20, 30, 40.
The cutter was held at an angle of about 30 degrees with respect to each of the 32, 42 surfaces. Next, add 250
g so that a load of about g is applied, as shown in FIG.
Cut grooves x and y were cut so as to cut through the respective active material layers 12, 22, 32 and 42. The interval between the cut grooves x and y was 1 mm, and ten cut grooves x and y were drawn so as to cross each other at right angles. As a result, 10
Zero cells were formed.

Then, as described above, the 10
Each electrode 10, 20, 30, 40 on which zero cells are formed
Of each of these active material layers 1
The height is approximately 1 in the direction perpendicular to the coating surface of 2, 22, 32, 42.
From the position of 00 mm, a drop test in which the electrodes 10, 20, 30, and 40 are freely dropped is repeated three times, and the number of dropped squares formed on the electrodes 10, 20, 30, and 40 is counted. Table 1 below shows the average value.
The result was as shown in the figure.

[0034]

[Table 1]

As is clear from the results in Table 1, the number of dropped cells of the hydrogen storage alloy electrodes 10, 20, and 30 of Examples 1, 2, and 3 is the number of dropped cells of the hydrogen storage alloy electrode 40 of the comparative example. It turns out that it is less. As shown in FIG. 1, when water (solvent of a binder (PEO)) is adhered to the exposed surface of the core 11 as in the hydrogen storage alloy electrode 10 of the first embodiment.
As shown in (a), attached water (solvent of binder)
Passes through a large number of holes 11a formed in the core 11, water permeates the active material layer 12 near the core 11, and the binder 12b solidified in the active material layer 12 is redissolved. Core 1
Diffusion to the vicinity of 1. The re-dissolved binder 12b is solidified by drying, so that the core 11 and the active material particles 12a are firmly fixed, and the active material particles 12a,
It is considered that 12a also firmly adhered to each other.

When an aqueous solution of PEO is adhered to the exposed surface of the core body 21 as in the hydrogen storage alloy electrode 20 of Example 2, as shown in FIG. Passing through a number of openings 21a drilled in the body 21,
The aqueous solution of PEO penetrates into the active material layer 22 near the core 21, and the binder 22 b solidified in the active material layer 22 is redissolved and diffuses to the vicinity of the core 21. This is considered to be because the core 21 and the active material particles 22a are more firmly fixed by drying the re-dissolved binder 22b, and the active material particles 22a, 22a are more firmly fixed to each other.

Further, the hydrogen storage alloy electrode 30 of the third embodiment
As shown in FIG. 1, after water is attached to the active material layer 33, the active material layer 33 is removed to form an exposed surface of the core 31.
As shown in (c), the water adhering to the active material layer 33 diffuses into and penetrates into the active material layer 33, and a part of the diffused water passes through the many openings 31 a formed in the core 31. It passes through and diffuses and penetrates into the active material layer 32 as well. Thereby, the binder 32b solidified in the active material layer 33 and the active material layer 32 is redissolved and diffused into the active material layers 33 and 32. As a result, the core 31 and the active material particles 32 are dried at the time of drying.
a is firmly fixed, and the active material particles 32a, 3
It is considered that 2a also firmly adhered to each other. In this case, when the active material layer 33 contains water, the active material layer 33 is softened. Therefore, if the active material layer 33 is cut before the contained water is dried, the cutting operation becomes easy.

In the above-described embodiment, an example in which water-soluble polyethylene oxide (PEO) is used as a binder (binder) has been described. An organic binder that dissolves in a solvent may be used. When an organic binder is used, the solvent to be sprayed on the exposed surface of the core or the active material layer needs to be an organic solvent.

Further, in the above embodiment, description has been made of an example of using the _{MmNi 3.4 Co 0 .8 Al 0.2 Mn} 0.6 as the hydrogen storage alloy, the hydrogen storage alloy T
An i-Ni-based or La (or Mm) -Ni-based multi-element alloy can be appropriately selected and used. Also,
In the above-described embodiment, an example in which a mechanically pulverized hydrogen storage alloy is used has been described. However, a hydrogen storage alloy manufactured by an atomizing method may be used.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view schematically showing a state in which an active material is attached around a hole formed in a core (punching metal) of an electrode. FIG. FIG. 1B is a cross-sectional view showing an electrode of Example 2, FIG. 1C is a cross-sectional view showing an electrode of Example 3, and FIG. It is sectional drawing which shows the electrode of an example.

FIG. 2 is a perspective view schematically showing a state in which a grid-like kerf is formed in an active material layer in order to perform a drop test of the active material.

FIG. 3 is a cross-sectional view schematically showing a state in which a conventional electrode group is housed in an outer can.

FIG. 4 is a cross-sectional view schematically showing a state in which an electrode group provided with an exposed surface of a core holding an active material of an electrode disposed on the outermost side is housed in an outer can.

[Explanation of symbols]

10, 20, 30, 40 ... hydrogen storage alloy electrode, 11, 12
1, 31, 41 ... core body (active material holding body), 11a, 21
a, 31a, 41a ... apertures, 12a, 22a, 32a,
42a: Active material particles, 12b, 22b, 32b, 42b
…binder

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toruyuki Murata 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Yasuhiko Ikeda 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Takashi Yamaguchi 2-5-5, Keihanhondori, Moriguchi-shi, Osaka 2-5 Sanyo Electric Co., Ltd. (72) Inventor Yasumasa Kondo 2, Keihanhondori, Moriguchi-shi, Osaka 5-5-5 Sanyo Electric Co., Ltd. (72) Inventor Kiyoshi Morita 2-5-5 Sanyo Electric Co., Ltd. (72) Inventor Makoto Ochi Keihanmoto, Moriguchi, Osaka 2-5-5, Sanyo Electric Co., Ltd. (72) Kosuke Satoguchi 2-5-5, Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 5H017 AA02 AS01 AS10 BB08 HH 05 5H028 AA05 AA07 BB06 BB07 CC08 CC10 CC13 CC24 5H050 AA01 AA07 BA14 CA03 CB17 DA03 DA04 FA05 FA08 GA02 GA10 GA12 GA22 HA12

Claims (6)

[Claims] 1. An electrode group in which positive and negative electrodes are stacked via a separator, and a core of an electrode disposed on the outermost side of the electrode group is exposed, and the exposed core is a metal outer can. A method of manufacturing an alkaline storage battery housed so as to be in contact with the active material, wherein an application step of applying an active material slurry comprising an active material, a binder, and a solvent for the binder to both surfaces of the core body; A drying step of drying the electrode to which the slurry is applied; an active material removing step of removing an active material on a side forming an exposed surface of the core; and adhering a solvent of the binder from the exposed surface of the core. And a solvent adhering step. 2. An electrode group in which positive and negative electrodes are stacked via a separator, and a core of an electrode disposed on the outermost side of the electrode group is exposed, and the exposed core is a metal outer can. A method for producing an alkaline storage battery housed so as to be in contact with the active material, wherein an application step of applying an active material slurry comprising an active material, a binder, and a solvent for the binder to both surfaces of the core; A drying step of drying the electrode on which the slurry is applied; a solvent adhering step of adhering the solvent of the binder from the active material layer side on which the exposed surface of the core is formed; and forming an exposed surface of the core. An active material removing step of removing the active material on the side of the alkaline storage battery. 3. The alkaline storage battery according to claim 2, wherein the step of removing the active material is performed after the step of attaching the solvent, in a state where the electrode to which the solvent of the binder is attached is undried. Manufacturing method. 4. The method for producing an alkaline storage battery according to claim 1, wherein the solvent in the solvent adhering step contains a binder. 5. The method according to claim 1, wherein the step of attaching the solvent in the solvent attaching step is performed by spraying.
The method for producing an alkaline storage battery according to any one of the above. 6. The electrode according to claim 1, wherein the electrode is a hydrogen storage alloy electrode using a hydrogen storage alloy capable of electrochemically storing and releasing hydrogen reversibly as an active material.
A method for producing an alkaline storage battery according to any one of claims 1 to 5.