Positive electrode plate for alkaline secondary batteries, alkaline secondary batteries equipped therewith, and method for manufacturing a positive electrode plate for alkaline secondary batteries

Abstract

The present invention provides a positive electrode plate for alkaline secondary batteries that can improve the tensile strength of the tab while maintaining windability. [Solution] The positive electrode plate 3 comprises a porous metal positive electrode plate body and a tab, one end 14a of which is fixed to the positive electrode plate body and the other end 14b of which extends beyond one side 3c of the positive electrode plate body. The positive electrode plate body has a coated portion 3b on which an active material is applied and a removed portion 3a on which the active material is removed. The removed portion 3a is formed in a region including one side 3c of the positive electrode plate body, and one end 14a of the tab 14 is fixed to it. On both sides of the one end 14a of the tab 14, a first reinforcing portion 21 is provided in a limited area on which resin is applied so as to cover the removed portion 3a, which is located between the coated portion 3b and the one side 3c, including one side 3c.

Description

Technical Field

[0001] The present invention relates to a positive electrode plate for an alkaline secondary battery, an alkaline secondary battery including the same, and a method for manufacturing the positive electrode plate for an alkaline secondary battery.

Background Art

[0002] The positive electrode plate used in an alkaline secondary battery has a structure in which an active material is applied to a porous metal positive electrode plate body such as foamed nickel. In order to form an electrical connection portion on the positive electrode plate, the applied active material is removed to form a removal portion, and one end of a tab (also referred to as a "lead") is fixed to this removal portion. The following structures have been proposed to ensure the tensile strength of the tab when the tab is pulled with respect to the positive electrode plate.

[0003] Patent Document 1 discloses filling the entire lead attachment portion from which the active material has been dropped with a polypropylene resin and solidifying it.

[0004] Patent Document 2 discloses attaching a lead to the exposed surface of the positive electrode current collector and partially providing a protective layer, which is a resin layer, around the lead.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in Patent Document 1, the entire lead attachment portion is filled with resin and solidified, which improves the tensile strength of the lead. However, because the resin hardens, when the positive electrode plate is wound up during the manufacturing of the secondary battery, there is a risk that cracks may occur in the resin due to bending stress. If cracks occur, there is a risk of a short circuit.

[0007] Patent Document 2 offers better winding properties compared to Reference Document 1 because it has a partially provided protective layer (resin layer). However, because the exposed surface of the positive electrode current collector from which the active material has been removed remains between the positive electrode mixture layer containing the active material and the protective layer, there is a risk that the tensile strength of the lead may not be sufficiently ensured.

[0008] The present invention has been made in view of these circumstances, and aims to provide a positive electrode plate for an alkaline secondary battery that can improve the tensile strength of the tab while maintaining windability, an alkaline secondary battery equipped with the same, and a method for manufacturing a positive electrode plate for an alkaline secondary battery. [Means for solving the problem]

[0009] A positive electrode plate for an alkaline secondary battery according to one aspect of the present invention comprises a porous metal positive electrode plate body and a tab, one end of which is fixed to the positive electrode plate body and the other end of which extends beyond one side of the positive electrode plate body, wherein the positive electrode plate body has a coated portion on which an active material is applied and a removed portion from which the active material is removed, the removed portion is formed in a region including the one side of the positive electrode plate body and the one end of the tab is fixed to it, and a first reinforcing portion is provided in a limited area on both sides of the one end of the tab, with resin applied so as to cover the removed portion which includes the one side and is located between the coated portion and the one side.

[0010] One end of the tab is fixed to the removal portion of the porous positive electrode plate body. Since the removal portion of the positive electrode plate body is not coated with active material and has low strength, it is necessary to ensure the tensile strength of the tab when pulling it against the positive electrode plate body. Therefore, a first reinforcing portion is provided on both sides of the tab, with resin applied to cover the removal portion located between the coated portion and one side of the positive electrode plate body. By providing the first reinforcing portion along one side, the edge of the removal portion can be reinforced intensively, and the tensile strength of the tab can be ensured. Furthermore, by providing the first reinforcement portion in a limited area, the area of ​​the first reinforcement portion is limited, allowing the area of ​​the removal portion where the first reinforcement portion is not provided to remain. Since the removal portion is more flexible than the first reinforcement portion in terms of bending deformation, crack formation is suppressed when the positive electrode plate body is wound up and deformed into a wound state, improving winding performance.

[0011] Furthermore, in a positive electrode plate for an alkaline secondary battery according to one aspect of the present invention, the removal portion is provided in a limited area on the corner opposite the side, where a second reinforcing portion coated with resin is provided.

[0012] The corner of the removal section opposite one side of the positive electrode plate body may experience reduced strength due to stress concentration. Therefore, a second reinforcement section coated with resin is provided in a limited area. This ensures the tensile strength of the tab and improves winding performance.

[0013] Furthermore, in a positive electrode plate for an alkaline secondary battery according to one aspect of the present invention, the basis weight of the positive electrode plate body is 300 g / m². 2 The following is stated:

[0014] The positive electrode plate itself has a basis weight of 300 g / m². 2 Below this point, a decrease in the strength of the removed section is observed, making the application of the first or second reinforcement section effective. For the positive electrode plate itself, for example, foamed nickel is used.

[0015] Furthermore, in the positive electrode plate for an alkaline secondary battery according to one aspect of the present invention, a protective tape is attached so as to cover the entire removal portion.

[0016] By covering the entire removal portion with the protective tape, the removal portion to which the tab is attached can be protected, and even when cracks occur in the first reinforcing portion or the second reinforcing portion during winding, the occurrence of a short circuit can be suppressed.

[0017] An alkaline secondary battery according to one aspect of the present invention includes an exterior can and an electrode group housed in the exterior can together with an alkaline electrolyte. The electrode group includes the positive electrode plate for an alkaline secondary battery according to any one of the above, a hydrogen storage alloy capable of electrochemically storing and releasing hydrogen, and a negative electrode plate facing the positive electrode plate for an alkaline secondary battery through a separator.

[0018] A method for manufacturing a positive electrode plate for an alkaline secondary battery according to one aspect of the present invention is a method for manufacturing a positive electrode plate for an alkaline secondary battery including a porous metal positive electrode plate body and a tab having one end fixed to the positive electrode plate body and the other end drawn out beyond one side of the positive electrode plate body. The method includes a step of applying an active material to the positive electrode plate body to form an application portion, a step of removing the active material applied to the application portion to partially form a removal portion in a region including the one side of the positive electrode plate body, a step of fixing the one end of the tab to the removal portion, and a step of providing in a region where a first reinforcing portion coated with a resin so as to cover the removal portion including the one side and located between the application portion along the one side is limited, on both sides of the one end of the tab.

Advantages of the Invention

[0019] It is possible to improve the tensile strength of the tab while maintaining the winding property.

Brief Description of the Drawings

[0020] [Figure 1] It is a perspective view showing a part of an alkaline secondary battery according to an embodiment of the present invention broken. [Figure 2] It is a partially enlarged plan view of a positive electrode plate to which tabs are attached. [Figure 3] It is a partially enlarged plan view showing a state in which a protective tape is attached from above the tab in FIG. 2. [Figure 4A] It is a partially enlarged plan view showing a process of forming a removal portion on the positive electrode plate. [Figure 4B] It is a partially enlarged plan view showing a process of forming a first reinforcing portion and a second reinforcing portion on the positive electrode plate.

Mode for Carrying Out the Invention

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, a nickel-hydrogen battery will be described as an example of an alkaline secondary battery.

[0022] <Configuration of Alkaline Secondary Battery> As shown in FIG. 1, a nickel-hydrogen battery (hereinafter referred to as "battery") 1 is of an AA-size cylindrical type. The battery 1 has a bottomed cylindrical outer can 2 with an open upper end, in which a positive electrode plate 3 and a negative electrode plate 4 are overlapped via a separator 5 and wound in a spiral shape, and an electrode group 6 is accommodated together with an alkaline electrolyte, and the upper end is sealed with a sealing body 7.

[0023] The outer can 2 has a bottom wall 8 having conductivity and functioning as a negative electrode terminal. The sealing body 7 includes a cover plate 9 and a positive electrode terminal 10. The cover plate 9 has conductivity and has a gas vent hole 11 in the center, and a rubber valve body 12 for closing the gas vent hole 11 is arranged on the outer surface of the cover plate 9. The cover plate 9 is arranged at the open end of the outer can 2 via a ring-shaped gasket 13, and the opening is closed by caulking the open edge of the outer can 2. A terminal is attached to the cover plate 9 and functions as the positive electrode terminal 10.

[0024] Each electrode group 6 consists of a strip-shaped positive electrode plate 3, a negative electrode plate 4, and a separator 5. The separator 5 is sandwiched between the positive electrode plate 3 and the negative electrode plate 4, and the group is wound in a spiral shape, forming a nearly cylindrical shape. That is, the positive electrode plate 3 and the negative electrode plate 4 face each other via the separator 5 and are superimposed radially on the outer casing 2.

[0025] Inside the outer casing 2, a tab 14 is positioned between one end of the electrode group 6 and the lid plate 9, with each end of the tab 14 electrically connected to the positive electrode plate 3 and the lid plate 9, respectively.

[0026] The positive electrode plate 3 consists of a conductive positive electrode plate body having a porous structure and a positive electrode mixture applied to the surface and pores of the positive electrode plate body. For the positive electrode plate body, for example, a nickel-plated mesh, sponge-like, or fibrous metal body or foamed nickel is used. The basis weight of the positive electrode plate body is 300 g / m². 2 The following is stated:

[0027] The positive electrode mixture includes positive electrode active material particles, a conductive material, a positive electrode additive, and a binder. The positive electrode active material particles are nickel hydroxide (Ni(OH)2) particles or higher-order nickel hydroxide particles. Cobalt hydroxide (Co(OH)2) is used as the conductive material. Y2O3, Nb2O5, TiO2, and Yb2O3 are used as positive electrode additives.

[0028] Figure 2 shows a structure in which tabs 14 are attached to the positive electrode plate 3. One end 14a of the tab 14 is fixed to the positive electrode plate 3, and the other end 14b extends beyond one side 3c of the positive electrode plate 3.

[0029] One end 14a of the tab 14 is fixed to the removal portion 3a of the positive electrode plate 3 by welding or the like. The removal portion 3a is the area from which the positive electrode mixture has been removed, and the positive electrode plate body is exposed. The area where the positive electrode mixture has not been removed is referred to as the coated portion 3b.

[0030] The removal portion 3a is formed in a region that includes one side 3c of the positive electrode plate 3. The shape of the removal portion 3a is rectangular. However, the shape of the removal portion 3a is not limited to a rectangle; it may be another polygon or have a rounded edge.

[0031] Tab 14 is located approximately in the center of the width direction (horizontal direction in Figure 2) of the removal section 3a. On both sides of Tab 14, there are first reinforcing sections 21, which include one side 3c and have resin applied along that side 3c. For example, a cyanoacrylate adhesive is used as the resin. The first reinforcing sections 21 are provided to connect the side of Tab 14 to the coated section 3b. The width of the first reinforcing section 21 (the dimension in the direction perpendicular to one side 3c) is sufficiently smaller than the dimension by which Tab 14 overlaps with the positive electrode plate 3, and is such that it forms a border along one side 3c of the removal section 3a. In this way, the first reinforcing sections 21 are provided only in a limited area of ​​the removal section 3a. As a result, the area of ​​the removal section 3a where the first reinforcing sections 21 are not formed is larger than the area of ​​the first reinforcing sections 21.

[0032] A second reinforcing portion 22 is provided at each of the two corners of the removal portion 3a facing one side 3c. The second reinforcing portion 22 is formed by applying resin in the same way as the first reinforcing portion 21. The second reinforcing portion 22 is provided in a limited area that covers the corner. As a result, the removal portion 3a where the second reinforcing portion 22 is not formed is larger than the second reinforcing portion 22. Furthermore, the area of ​​the removed section 3a, where neither the first reinforcement section 21 nor the second reinforcement section 22 is formed, is larger than the combined area of ​​the first reinforcement section 21 and the second reinforcement section 22.

[0033] As shown in Figure 3, protective tape 24 is applied over tab 14 to cover the entire removal portion 3a. The protective tape 24 is made of an insulating material.

[0034] The negative electrode plate 4 shown in Figure 1 has a strip-shaped conductive negative electrode core, to which a negative electrode mixture is applied. The negative electrode core is made of a sheet-like metal material with distributed through holes; for example, a perforated iron sheet with nickel plating on its surface is used. When the negative electrode mixture is applied to the negative electrode core, it forms a negative electrode mixture layer.

[0035] The negative electrode mixture includes hydrogen storage alloy particles, negative electrode additives, a conductive material, and a binder.

[0036] A hydrogen storage alloy is an alloy capable of absorbing and releasing hydrogen, which is the negative electrode active material. A general hydrogen storage alloy can be used as the hydrogen storage alloy. In this disclosure, however, it is preferable to use a rare earth-Mg-Ni hydrogen storage alloy containing rare earth elements, Mg, and Ni.

[0037] Separator 5 is made of a nonwoven fabric consisting of polypropylene fibers that have been treated with fluorine or sulfonation.

[0038] The electrode group 6 is housed in the outer container 2 such that the negative electrode side is in contact with the bottom wall 8 of the outer container 2.

[0039] Furthermore, a predetermined amount of alkaline electrolyte is injected into the outer casing 2. The alkaline electrolyte impregnates the positive electrode plate 3, the negative electrode plate 4, and the separator 5, and contributes to the electrochemical reaction between the positive electrode plate 3 and the negative electrode plate 4, the so-called charge-discharge reaction. As the alkaline electrolyte, an alkaline electrolyte containing NaOH as the main solute is used. After that, the opening of the outer casing 2 is closed.

[0040] <Manufacturing method for alkaline rechargeable batteries> Next, the manufacturing method of the battery 1 described above will be explained below. (1) Manufacturing of positive electrode plates Nickel sulfate, aluminum sulfate, and cobalt sulfate are weighed to a predetermined composition, and the weighed nickel sulfate, aluminum sulfate, and cobalt sulfate are added to a 1 mol / L sulfuric acid aqueous solution to prepare a mixed aqueous solution. To this mixed aqueous solution, a 10 mol / L sodium hydroxide aqueous solution is gradually added while stirring to stabilize the pH of the aqueous solution during the reaction to 13-14, thereby producing nickel hydroxide particles in which Al and Co are solid-dissolved, mainly nickel hydroxide. As a result, nickel hydroxide powder, which is a mixture of nickel hydroxide particles in which Al and Co are solid-dissolved, is obtained as a positive electrode active material powder.

[0041] When forming a conductive layer on the surface of these nickel hydroxide particles, the following treatment can be performed.

[0042] First, the nickel hydroxide particles obtained as described above are placed in an ammonia aqueous solution, and then an ammonia aqueous solution is added to this solution. As a result, the nickel hydroxide particles act as nuclei, and cobalt hydroxide precipitates on the surface of these nuclei, forming an active material with a conductive layer made of cobalt hydroxide.

[0043] To 100 parts by mass of the above positive electrode active material powder, 3.5 parts by mass of cobalt hydroxide and 0.2 parts by mass of hydroxypropyl cellulose (HPC) powder are added as appropriate, and Y2O3 is added as an additive in a dry state and mixed. Furthermore, in addition to Y2O3, at least one of Nb2O5, TiO2, and Yb2O3 may be added as a second additive and mixed as appropriate. Then, 30 parts by mass of water and 0.3 parts by mass of PTFE are added to prepare a positive electrode active material slurry. The positive electrode active material slurry is filled into a tape-shaped positive electrode plate body made of foamed nickel and dried. After that, the positive electrode plate body with the dried slurry is roll-rolled and cut to prepare a positive electrode plate 3 for AA size.

[0044] Next, as shown in Figure 4A, the positive electrode mixture is partially removed by ultrasound to form the removal section 3a. Then, as shown in Figure 4B, one end 14a of the tab 14 is fixed to the removal portion 3a by welding or the like. Subsequently, as shown in Figure 2, the first reinforcing portion 21 and the second reinforcing portion 22 are formed by applying resin. Finally, as shown in Figure 3, protective tape 24 is applied over tab 14 to cover the entire removal section 3a.

[0045] (2) Fabrication of the negative electrode plate First, a rare earth component containing 30% by mass of lanthanum (La) and 70% by mass of samarium (Sm) is prepared. The resulting rare earth component, along with Mg, Ni, and Al, is weighed to create a mixture in which these elements are present in a molar ratio of 0.90:0.10:3.33:0.17. This mixture is melted in an induction furnace, and the molten metal is poured into a mold and cooled to room temperature to form a hydrogen storage alloy ingot.

[0046] The hydrogen storage alloy ingot described above is subjected to a heat treatment at 1000°C for 10 hours in an argon gas atmosphere. After the heat treatment, the ingot is cooled to room temperature and mechanically crushed in an argon gas atmosphere to obtain hydrogen storage alloy powder consisting of hydrogen storage alloy particles.

[0047] To 100 parts by mass of this hydrogen storage alloy powder, 0.4 parts by mass of sodium polyacrylate, 0.1 parts by mass of carboxymethylcellulose, 1.0 part by mass of styrene-butadiene rubber (SBR) dispersion, 1.0 part by mass of carbon black, and 30 parts by mass of water are added and kneaded to prepare a negative electrode mixture paste. This paste is applied to both sides of a tape-shaped perforated iron plate so that the thickness is uniform on each side. The perforated plate has a thickness of 60 μm and its surface is nickel-plated.

[0048] After the paste is dried, the perforated plate is roll-rolled to increase the amount of alloy per unit volume of the negative electrode mixture, and then cut to a predetermined size to produce a negative electrode plate 4 for AA size.

[0049] (3) Battery assembly The positive electrode plate 3 and the negative electrode plate 4 are stacked so that their respective longitudinal directions are the same, and the electrode group 6 is formed by winding them in a spiral shape with a separator 5 sandwiched between the two electrode plates. In this embodiment, the separator 5 is made of a nonwoven fabric of polypropylene fibers that has been treated with sulfonation, and has a thickness of 0.1 mm (basis weight 53 g / m2).

[0050] The alkaline electrolyte is an aqueous solution containing KOH, NaOH, and LiOH. In this embodiment, the alkaline electrolyte contains KOH, NaOH, and LiOH in a ratio of KOH:NaOH:LiOH = 0.8:7.0:0.02.

[0051] Next, the electrode group 6 is placed in the outer casing 2, and a predetermined amount of alkaline electrolyte is injected. Then, the opening of the outer casing 2 is sealed with the sealing body 7, and an AA-sized nickel-metal hydride battery with a nominal capacity of 2000mAh is assembled. The nominal capacity of battery 1 is the discharge capacity when charged at 0.2It for 16 hours in an environment of 25°C, and then discharged at 0.4It until the battery voltage reaches 1.0V. [Examples]

[0052] Next, we will describe the test conducted to determine the tensile strength of the tabs on the positive electrode plate. In Example 1, the structure of the positive electrode plate 3 described above was adopted, and a first reinforcing portion 21 and a second reinforcing portion 22 were provided. Comparative Example 1 was a specification (STD) without a reinforcement section and without resin coating. Comparative Example 2 was a specification in which resin was applied to the entire removal section 3a as a reinforcement section. In both Example 1 and Comparative Example 2, a cyanoacrylate-based adhesive was used as the resin for the reinforcing portion. The basis weight of the positive electrode plate body was 250 g / m² for all of Examples 1, Comparative Example 1, and Comparative Example 2. 2 That's what I decided.

[0053] Table 1 shows the test results for the tensile strength of the tabs. The tensile test was performed using a CR-3000EX manufactured by Sun Science Co., Ltd. The tabs and positive electrode plate were fixed with clamps and pulled at a speed of 0.3 m / min, and the force at which the tabs detached was measured. The winding performance was evaluated by measuring the number of cracks around the fixed part of the resin and checking for the presence or absence of cracks that exposed the substrate from the end. Those with cracks were marked with ×, and those without cracks were marked with ○.

[0054] [Table 1]

[0055] As can be seen from the test results in Table 1, Example 1's tab strength (tensile strength of the tab) exceeds the standard value of 10N, and its winding performance is also satisfactory. In contrast, in Comparative Example 1, the winding performance was satisfactory, but the tab strength did not meet the standard value because there was no reinforcement. In Comparative Example 2, sufficient tab strength was obtained, but cracks were observed because resin was applied to the entire removal area, resulting in a failure of winding performance.

[0056] Other resins that can be used for reinforcement include ethylene-vinyl acetate resin adhesives and chloroprene rubber adhesives. However, it has been confirmed that the cyanoacrylate adhesive used in Example 1 has greater strength.

[0057] The effects and benefits of the above-described embodiment are as follows: One end of the tab 14 is fixed to the removal portion 3a of the porous positive electrode plate 3, 14a. Since the removal portion 3a is not coated with active material and has low strength, it is necessary to ensure the tensile strength required to pull the tab 14 against the positive electrode plate 3. Therefore, first reinforcing portions 21 are provided on both sides of the tab 14, with resin applied along one side 3c of the positive electrode plate 3 and covering the removal portion 3a between the removal portion 3a and the coated portion 3b. By providing the first reinforcing portions 21 along one side 3c, the edge of the removal portion 3a can be reinforced intensively, and the tensile strength of the tab 14 can be ensured. Furthermore, since the first reinforcing portion 21 is provided in a limited area, it is possible to leave an area of ​​the removal portion 3a where the first reinforcing portion 21 is not provided. Since the removal portion 3a is more flexible than the first reinforcing portion 21 in terms of bending deformation, crack formation is suppressed when the positive electrode plate 3 is wound up and deformed into a wound state, and winding performance is improved.

[0058] The corner of the removal portion 3a facing one side 3c of the positive electrode plate 3 may experience reduced strength due to stress concentration. Therefore, a second reinforcing portion 22 coated with resin is provided in a limited area. This ensures the tensile strength of the tab 14 and improves winding performance.

[0059] The positive electrode plate itself has a basis weight of 300 g / m². 2 When the strength of the removed portion 3a decreases below a certain point, the application of the first reinforcing portion 21 or the second reinforcing portion 22 is effective.

[0060] By covering the entire removal section 3a with protective tape 24, the removal section 3a to which the tab 14 is attached can be protected, and even if a crack occurs in the first reinforcement section 21 or the second reinforcement section 22 during winding, the occurrence of a short circuit can be suppressed.

[0061] In the embodiment described above, a second reinforcing portion 22 is provided in addition to the first reinforcing portion 21, but it is also possible to provide only the first reinforcing portion 21 without the second reinforcing portion 22. [Explanation of symbols]

[0062] 1. Nickel-metal hydride battery (alkaline rechargeable battery) 2 outer cans 3 Positive plate 3a Removal part 3b Application part 4 Negative plate 5 Separators 6 electrode groups 7 Sealing body 8 Bottom wall 9 Lid plate 10 Positive terminal 11. Gas vent holes 12 valve bodies 13 Gasket 14 tabs 14a one end 14b Other end 21. First Reinforcement Section 22 Second Reinforcement Unit 24 protective tape

Claims

1. A porous metal positive electrode plate body, A tab is fixed at one end to the positive electrode plate body, with the other end extending beyond one side of the positive electrode plate body, Equipped with, The positive electrode plate body has a coated portion on which an active material is applied and a removed portion on which the active material is removed. The removal portion is formed in a region including one side of the positive electrode plate body, and one end of the tab is fixed to it. A positive electrode plate for an alkaline secondary battery, wherein a first reinforcing portion is provided in a limited area on both sides of the one end of the tab, including the one side and covering the removal portion located between the one side and the coated portion along that side.

2. The positive electrode plate for an alkaline secondary battery according to claim 1, wherein the removal portion has a second reinforcing portion in a limited area, where resin is applied to the corner opposite to the side.

3. The basis weight of the positive electrode plate body is 300 g / m². ２ The positive electrode plate for an alkaline secondary battery according to claim 1 or 2, as follows:

4. The positive electrode plate for an alkaline secondary battery according to claim 1 or 2, wherein protective tape is applied so as to cover the entire removal portion.

5. The outer can and The electrode group housed together with the alkaline electrolyte in the aforementioned outer container, Equipped with, The electrode group comprises a positive electrode plate for an alkaline secondary battery as described in claim 1 or 2, and a negative electrode plate that includes a hydrogen storage alloy capable of electrochemically absorbing and releasing hydrogen, and which faces the positive electrode plate of the alkaline secondary battery via a separator. An alkaline rechargeable battery equipped with [a specific feature].

6. A porous metal positive electrode plate body, A tab is fixed at one end to the positive electrode plate body, with the other end extending beyond one side of the positive electrode plate body, A method for manufacturing a positive electrode plate for an alkaline secondary battery, comprising: The process of applying an active material to the positive electrode plate body to form a coated portion, A step of removing the active material applied to the coated portion to partially form a removal portion in the region including one side of the positive electrode plate body, The steps include fixing one end of the tab to the removal portion, A step of providing a first reinforcing portion in a limited area on both sides of the one end of the tab, the first reinforcing portion being coated with resin so as to cover the removal portion located between the one side and the coated portion along that side, A method for manufacturing a positive electrode plate for alkaline secondary batteries having the following properties.

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