JP6344746B2 - Alkaline battery and method for producing alkaline battery - Google Patents

Description

  The present invention relates to an alkaline battery and a method for producing an alkaline battery.

  Some alkaline batteries have a positive electrode mixture disposed in a metal positive electrode can and a negative electrode mixture disposed in a metal negative electrode can (see, for example, Patent Document 1). In this type of alkaline battery, the positive electrode can functions as a positive electrode terminal by contacting with a positive electrode mixture disposed inside thereof, and the negative electrode can functions as a negative electrode terminal by contacting with a negative electrode mixture disposed inside thereof. Function.

JP 2010-33962 A

  By the way, in recent years, an alkaline battery having an outer package formed by superposing film members has been developed in response to a demand for thinning the alkaline battery. This type of alkaline battery includes, for example, a positive electrode lead portion and a negative electrode lead portion that extend from the inside of the outer package toward the outside in order to provide the positive electrode terminal and the negative electrode terminal outside the outer package. The positive electrode lead portion is electrically connected to the positive electrode current collector inside the outer package, and extends from the inside of the outer package toward the outside through the laminated films. The negative electrode lead portion is electrically connected to the negative electrode current collector inside the exterior body, and extends from the inside of the exterior body toward the outside through the laminated films.

  However, in an alkaline battery having an exterior body formed of a film member, the electrolyte contained in the exterior body advances between the negative electrode lead portion and the film member while altering the surface of the negative electrode lead portion. There is a possibility that a so-called creeping phenomenon may occur. If this scooping occurs, the inside and outside of the exterior body communicate with each other, and the electrolyte solution may leak.

  Therefore, the present invention provides an alkaline battery in which leakage of the electrolytic solution is suppressed and a method for producing the alkaline battery.

The alkaline battery of the present invention includes a positive electrode having a positive electrode mixture and a positive electrode current collector, and an electrode body formed by laminating a negative electrode having a negative electrode mixture and a negative electrode current collector with a separator interposed therebetween, The film and the second film are overlapped in the first direction with the electrode body in between, forming a cavity for accommodating the electrode body together with the electrolytic solution between the first film and the second film, and An exterior body having a peripheral edge portion in which the first film and the second film laminated around the cavity are in close contact with each other, and the first film laminated at the peripheral edge portion in conduction with the negative electrode current collector in the cavity. A negative electrode lead portion extending between the film and the second film and extending toward the outside of the exterior body. A creeping suppression portion that suppresses the electrolyte from entering the negative electrode lead portion, the first film, and the second film is formed in the portion that performs the creeping suppression portion. Of the portion, only the portion located outside the cavity and at least in the peripheral portion is formed of nickel and is configured.
The alkaline battery of the present invention includes a positive electrode having a positive electrode mixture and a positive electrode current collector, and an electrode body formed by laminating a negative electrode having a negative electrode mixture and a negative electrode current collector with a separator interposed therebetween, The film and the second film are overlapped in the first direction with the electrode body in between, forming a cavity for accommodating the electrode body together with the electrolytic solution between the first film and the second film, and An exterior body having a peripheral edge portion in which the first film and the second film laminated around the cavity are in close contact with each other, and the first film laminated at the peripheral edge portion in conduction with the negative electrode current collector in the cavity. A negative electrode lead portion extending between the film and the second film and extending toward the outside of the exterior body. A creeping suppression portion that suppresses the electrolyte from entering the negative electrode lead portion, the first film, and the second film is formed in the portion that performs the creeping suppression portion. It is formed by disposing a sealing material containing blown asphalt on the surface of the part.
The alkaline battery of the present invention includes a positive electrode having a positive electrode mixture and a positive electrode current collector, and an electrode body formed by laminating a negative electrode having a negative electrode mixture and a negative electrode current collector with a separator interposed therebetween, The film and the second film are overlapped in the first direction with the electrode body in between, forming a cavity for accommodating the electrode body together with the electrolytic solution between the first film and the second film, and An exterior body having a peripheral edge portion in which the first film and the second film laminated around the cavity are in close contact with each other, and the first film laminated at the peripheral edge portion in conduction with the negative electrode current collector in the cavity. A negative electrode lead portion extending between the film and the second film and extending toward the outside of the exterior body. A creeping suppression portion that suppresses the electrolyte from entering the negative electrode lead portion, the first film, and the second film is formed in the portion that performs the creeping suppression portion. At least a portion located within the peripheral portion of the portion is formed of nickel, and is formed by disposing a sealing material containing blown asphalt on the surface of the negative electrode lead portion.

According to the present invention, the electrolyte contained in the cavity scoops up toward the outside of the exterior body and enters between the negative electrode lead portion and the first film and the second film in the peripheral portion of the exterior body. It can suppress by the suppression part. Thereby, it can suppress that a cavity and the exterior of an exterior body communicate through between the negative electrode lead part in the peripheral part of an exterior body, and a 1st film and a 2nd film. Therefore, it can suppress that electrolyte solution leaks.
In addition, the negative electrode lead portion, the first film, and the first film are compared with the case where the portion of the negative electrode lead portion located in the peripheral portion of the exterior body is formed of copper, which is generally used as a material for forming the negative electrode current collector. The rate of entry of the electrolyte between the two films can be reduced. Thereby, the approach of the electrolyte solution between a negative electrode lead part and a 1st film and a 2nd film can be suppressed. Therefore, the above-described scooping suppression portion can be easily formed.
Moreover, compared with the structure by which the negative electrode lead part, the 1st film, and the 2nd film are laminated | stacked directly, the approach rate of the electrolyte solution between a negative electrode lead part, a 1st film, and a 2nd film is reduced. be able to. Thereby, the approach of the electrolyte solution between a negative electrode lead part and a 1st film and a 2nd film can be suppressed. Therefore, the above-described scooping suppression portion can be easily formed.
In the alkaline battery, the surface of the pre-SL negative electrode lead portion, benzotriazoles are disposed, it is desirable.
The alkaline battery of the present invention includes a positive electrode having a positive electrode mixture and a positive electrode current collector, and an electrode body formed by laminating a negative electrode having a negative electrode mixture and a negative electrode current collector with a separator interposed therebetween, The film and the second film are overlapped in the first direction with the electrode body in between, forming a cavity for accommodating the electrode body together with the electrolytic solution between the first film and the second film, and An exterior body having a peripheral edge portion in which the first film and the second film laminated around the cavity are in close contact with each other, and the first film laminated at the peripheral edge portion in conduction with the negative electrode current collector in the cavity. A negative electrode lead portion extending between the film and the second film and extending toward the outside of the exterior body. A creeping suppression portion that suppresses the electrolyte from entering the negative electrode lead portion, the first film, and the second film is formed in the portion that performs the creeping suppression portion. It is formed by disposing benzotriazole on the surface of the part.
According to the present invention, since the surface of the negative electrode lead portion can be prevented from being deteriorated by benzotriazole, the electrolytic solution changes the surface of the negative electrode lead portion between the negative electrode lead portion and the first film and the second film. It can suppress entering. Therefore, the above-described scooping suppression portion can be easily formed.

In the alkaline battery, the prior SL negative electrode lead portion, the communicating portion for adhering said first film and said second film together through the first direction is formed, it is desirable.

  According to the present invention, since the first film and the second film are brought into close contact with each other in the communication portion, the first film with respect to the negative electrode lead portion in the region where the communication portion is formed in the negative electrode lead portion, The adhesion of the second film can be improved. Thereby, the approach of the electrolyte solution between a negative electrode lead part and a 1st film and a 2nd film can be suppressed. Therefore, the above-described scooping suppression portion can be easily formed.

  In the alkaline battery, the separator has an outer edge portion sandwiched between the first film and the second film laminated at the peripheral edge portion, and the separator penetrates the separator in the first direction. In addition, it is desirable that a separator communication portion for closely contacting the first film and the second film is formed.

In the cavity, a region where the positive electrode mixture is disposed and a region where the negative electrode mixture is disposed are provided by being separated by a separator. When the region where the positive electrode mixture is arranged and the region where the negative electrode mixture is arranged communicate with each other, the positive electrode mixture is decomposed to generate a gas, and the negative electrode current collector is deteriorated by the gas, so that the battery performance is improved. May decrease.
According to the present invention, since the first film and the second film enter and adhere to the separator communication portion, it is possible to prevent the separator from being displaced with respect to the first film and the second film. Thereby, it can prevent that the area | region where the positive mix is arrange | positioned in a cavity, and the area | region where a negative mix are arrange | positioned resulting from the position shift of a separator. Therefore, the battery performance can be prevented from deteriorating.

  The method for producing an alkaline battery of the present invention is the method for producing an alkaline battery described above, wherein the first sheet for forming the first film and the second film are formed so as to surround the periphery of the electrode body. An ultrasonic welding process for welding the second sheet by ultrasonic welding, and a thermal welding process for thermally welding a portion where the first sheet, the second sheet, and the negative electrode lead portion overlap each other are provided.

  According to the present invention, since the first sheet and the second sheet are welded by ultrasonic welding so as to surround the periphery of the electrode body, the electrolytic solution housed in the cavity together with the electrode body is prevented from being heated to become a gas. it can. Thereby, since it can prevent that an exterior body expand | swells, the sealing precision of a cavity can be improved. And since the part which a 1st sheet, a 2nd sheet, and a negative electrode lead part overlap is heat-welded, a negative electrode lead part, a 1st sheet | seat, and a 2nd sheet | seat can be stuck closely. Therefore, it is possible to suppress the electrolyte from entering between the negative electrode lead portion and the first film and the second film in the finished product.

In the method for producing an alkaline battery, it is preferable to include a positive electrode current collector arranging step of welding the positive electrode current collector to the first sheet.
In the method for producing an alkaline battery, it is preferable that the method includes a negative electrode current collector arranging step of welding the negative electrode current collector to the second sheet.

  According to the present invention, since the current collector can be fixed to the sheet, it is possible to prevent the current collector from being displaced during manufacture, and to prevent the current collector from being misaligned in the finished product. Therefore, a high quality alkaline battery can be easily manufactured.

  In the method for manufacturing an alkaline battery, it is preferable that the separator includes a separator arranging step of welding the separator to one of the first sheet and the second sheet.

  According to the present invention, since the separator can be fixed to the sheet, it is possible to prevent the separator from being displaced or twisted during manufacturing. Therefore, an alkaline battery can be easily manufactured.

  According to the present invention, the electrolyte contained in the cavity scoops up toward the outside of the exterior body and enters between the negative electrode lead portion and the first film and the second film in the peripheral portion of the exterior body. It can suppress by the suppression part. Thereby, it can suppress that a cavity and the exterior of an exterior body communicate through between the negative electrode lead part in the peripheral part of an exterior body, and a 1st film and a 2nd film. Therefore, it can suppress that electrolyte solution leaks.

It is a top view of the battery concerning an embodiment. It is sectional drawing in the II-II line of FIG. It is a top view of a separator. It is a top view of a positive electrode current collector and a positive electrode lead part. It is a top view of a negative electrode collector and a negative electrode lead part. It is sectional drawing in the VI-VI line of FIG. It is sectional drawing in the VII-VII line of FIG. It is a flowchart which shows the manufacturing method of the battery which concerns on embodiment. It is process drawing which shows the manufacturing method of the battery which concerns on embodiment. It is process drawing which shows the manufacturing method of the battery which concerns on embodiment. It is process drawing which shows the manufacturing method of the battery which concerns on embodiment. It is process drawing which shows the manufacturing method of the battery which concerns on embodiment. It is process drawing which shows the manufacturing method of the battery which concerns on embodiment. It is process drawing which shows the manufacturing method of the battery which concerns on embodiment. It is process drawing which shows the manufacturing method of the battery which concerns on embodiment. It is process drawing which shows the manufacturing method of the battery which concerns on embodiment. It is process drawing which shows the manufacturing method of the battery which concerns on embodiment. It is process drawing which shows the manufacturing method of the battery which concerns on embodiment. It is process drawing which shows the manufacturing method of the battery which concerns on embodiment. It is process drawing which shows the manufacturing method of the battery which concerns on embodiment. It is a top view of the battery which concerns on the modification of embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, a silver oxide battery (hereinafter simply referred to as “battery”) will be described as an example of the alkaline battery.
[Embodiment]
The battery 1 of the embodiment will be described.
FIG. 1 is a plan view of the battery according to the embodiment. 2 is a cross-sectional view taken along line II-II in FIG.
As shown in FIGS. 1 and 2, the battery 1 includes an electrode body 10, an exterior body 20 that houses the electrode body 10 together with an electrolytic solution, and a positive electrode lead portion 31 and a negative electrode that extend from the inside of the exterior body 20 toward the outside. Lead portion 32.

  The exterior body 20 is formed by overlapping a first film 21 and a second film 22 formed of a laminate film. The laminate film has at least an inner resin layer provided on the inner surface (overlapping surface) and an outer resin layer provided on the outer surface. The inner resin layer is formed by using a thermoplastic resin such as polyolefin polyethylene, polypropylene, or EVA, for example. The outer resin layer is formed using, for example, nylon resin. In the following description, the overlapping direction (first direction) of the first film 21 and the second film 22 is simply referred to as the overlapping direction.

  Here, a gas barrier layer made of a metal foil layer, silicon oxide, or the like, and an adhesive layer for bonding the layers may be provided between the inner resin layer and the outer resin layer. The metal foil layer is formed using a metal material such as stainless steel having a barrier property against outside air and water vapor and a corrosion resistance against an electrolytic solution. In this case, the inner resin layer and the outer resin layer are bonded to each other with the metal foil layer by thermal fusion or an adhesive via a bonding layer. In addition, in order to improve the adhesiveness of each layer, it is desirable to provide an adhesive layer formed of an adhesive between the respective layers.

  Each of the films 21 and 22 is formed in a rectangular shape having substantially the same shape and the same size. A first concave portion 21 a that is recessed toward the side away from the second film 22 in the overlapping direction is formed in the central portion of the inner surface of the first film 21. The first recess 21a is formed in a rectangular shape when viewed from the overlapping direction. A second recess 22a that is recessed toward the side away from the first film 21 in the overlapping direction is formed at the center of the inner surface of the second film 22. The second recess 22a is formed in a rectangular shape that substantially matches the first recess 21a when viewed from the overlapping direction. A space between the first recess 21a and the second recess 22a serves as a cavity 23 for accommodating the electrode body 10 together with the electrolytic solution.

  The exterior body 20 has a peripheral edge portion 24 in which the first film 21 and the second film 22 laminated around the cavity 23 are welded and closely adhered. The peripheral edge portion 24 is formed in a rectangular frame shape when viewed from the overlapping direction. In the peripheral portion 24 of the outer package 20, the second film 22 has a positive electrode terminal exposure hole 25 for exposing the positive electrode lead portion 31 to the outside of the outer package 20 and a negative electrode for exposing the negative electrode lead portion 32 to the outside of the outer package 20. Terminal exposure holes 26 are formed.

The electrode body 10 is configured by laminating a positive electrode 11 and a negative electrode 14 with a separator 17 interposed therebetween.
The separator 17 is disposed between the first film 21 and the second film 22. The separator 17 is formed in a rectangular shape larger than the cavity 23 when viewed from the overlapping direction. The outer edge portion 17 a of the separator 17 is sandwiched between the first film 21 and the second film 22 laminated at the peripheral edge portion 24 of the exterior body 20 and is welded and fixed to the exterior body 20. .

  The separator 17 divides the cavity 23 into a region on the first film 21 side where the positive electrode 11 is disposed and a region on the second film 22 side where the negative electrode 14 is disposed. The separator 17 is made of, for example, a cell having a two-layer structure made of cellophane and a film obtained by graft polymerization of polyethylene. The separator 17 is disposed so that a film obtained by graft polymerization of polyethylene on the region side where the positive electrode 11 is disposed and the cellophane face the region side where the negative electrode 14 is disposed.

FIG. 3 is a plan view of the separator.
As shown in FIGS. 2 and 3, a plurality of separator through holes 17 b (separator communication portions) that penetrate the separator 17 in the thickness direction (that is, the overlapping direction) are formed in the outer edge portion 17 a of the separator 17. Yes. The plurality of separator through holes 17 b are arranged over the entire circumference of the outer edge portion 17 a of the separator 17. Each separator through-hole 17b has the first film 21 and the second film 22 welded to each other inside thereof.

FIG. 4 is a plan view of the positive electrode current collector and the positive electrode lead portion.
As shown in FIG. 2, the positive electrode 11 includes a positive electrode current collector 12 and a positive electrode mixture 13. The positive electrode current collector 12 is formed of a metal foil such as nickel. The positive electrode current collector 12 is formed in a rectangular shape (see FIG. 4). The positive electrode current collector 12 is welded onto the bottom surface of the first recess 21 a in the first film 21 of the exterior body 20. The positive electrode mixture 13 is disposed between the positive electrode current collector 12 and the separator 17. The positive electrode mixture 13 is prepared by mixing silver oxide as a positive electrode active material, graphite as a conductive agent, sodium polyacrylate or carboxymethyl cellulose as a binder, and then press molding with a tableting machine or the like. It is formed in a rectangular shape in plan view.

FIG. 5 is a plan view of the negative electrode current collector and the negative electrode lead portion.
The negative electrode 14 includes a negative electrode current collector 15 and a negative electrode mixture 16. The negative electrode current collector 15 is formed of, for example, a metal foil such as copper or copper whose surface is plated with tin. The negative electrode current collector 15 is formed in a rectangular shape (see FIG. 5). The entire surface of the negative electrode current collector 15 is coated (arranged) with benzotriazole. As the benzotriazole, for example, 1,2,3-benzotriazole is suitable. The negative electrode current collector 15 is welded onto the bottom surface of the second recess 22 a in the second film 22 of the exterior body 20. The negative electrode mixture 16 is disposed between the negative electrode current collector 15 and the separator 17. The negative electrode mixture 16 includes zinc powder or zinc alloy powder as a negative electrode active material, zinc oxide as a conductivity stabilizer, highly cross-linked sodium polyacrylate as an active material stabilizer, and carboxymethyl cellulose as a thickener. And an electrolytic solution are mixed to form a gel.
As the electrolytic solution, an aqueous potassium hydroxide solution, an aqueous sodium hydroxide solution, or a mixture thereof can be used.

  As shown in FIGS. 1 and 4, the positive electrode lead portion 31 is formed in a strip shape extending with a substantially constant width by a metal foil such as nickel. The base end portion of the positive electrode lead portion 31 is connected to the positive electrode current collector 12 in the cavity 23 and is conductive. In the present embodiment, the positive electrode lead portion 31 is formed integrally with the positive electrode current collector 12.

6 is a cross-sectional view taken along line VI-VI in FIG.
As shown in FIGS. 1 and 6, the positive electrode lead portion 31 extends between the first film 21 and the second film 22 laminated at the peripheral edge portion 24 of the exterior body 20. The positive electrode lead portion 31 is welded to the first film 21 and the second film 22 at the peripheral edge portion 24 of the exterior body 20. The leading end portion of the positive electrode lead portion 31 is sandwiched between the first film 21 and the second film 22. The vicinity of the tip of the positive electrode lead portion 31 is a positive electrode terminal 37 exposed to the outside through the positive electrode terminal exposure hole 25 of the second film 22. The length dimension L1 of the portion on the cavity 23 side of the positive electrode terminal 37 in the portion located in the peripheral edge portion 24 of the positive electrode lead portion 31 is larger than the width dimension of the positive electrode lead portion 31.

  A plurality of positive electrode lead through holes 34 penetrating the positive electrode lead portion 31 in the overlapping direction are formed in a portion of the positive electrode lead portion 31 located in the peripheral edge portion 24 of the exterior body 20. The plurality of positive electrode lead through holes 34 are formed closer to the cavity 23 than the positive electrode terminal 37. Each positive electrode lead through hole 34 has the first film 21 and the second film 22 welded and adhered inside thereof. The plurality of positive electrode lead through holes 34 serve as a positive electrode side creeping suppression portion 40 that suppresses the ingress of the electrolyte solution between the positive electrode lead portion 31 and the first film 21 and the second film 22.

  As shown in FIGS. 1 and 5, the negative electrode lead portion 32 is disposed at a position spaced from the positive electrode lead portion 31. The negative electrode lead part 32 is formed in a strip shape extending with a substantially constant width by a metal foil. The base end portion of the negative electrode lead portion 32 is connected to the negative electrode current collector 15 in the cavity 23 to be conductive.

7 is a cross-sectional view taken along line VII-VII in FIG.
As shown in FIGS. 1 and 7, the negative electrode lead portion 32 extends between the first film 21 and the second film 22 laminated at the peripheral edge portion 24 of the exterior body 20. The negative electrode lead portion 32 is welded to the first film 21 and the second film 22 at the peripheral edge portion 24 of the exterior body 20. The tip of the negative electrode lead portion 32 is sandwiched between the first film 21 and the second film 22. The vicinity of the tip of the negative electrode lead portion 32 is a negative electrode terminal 38 exposed to the outside through the negative electrode terminal exposure hole 26 of the second film 22. The length dimension L2 of the portion of the negative electrode lead portion 32 located in the peripheral portion 24 and closer to the cavity 23 than the negative electrode terminal 38 is larger than the width dimension of the negative electrode lead portion 32.

  As shown in FIG. 5, the negative electrode lead portion 32 is formed by a first portion 32a formed on the proximal end side and a second portion 32b formed on the distal end side and connected to the first portion 32a. ing. The first portion 32a is formed of, for example, copper or copper whose surface is plated with tin. In the present embodiment, the first portion 32 a is integrally formed with the negative electrode current collector 15.

  The entire surface of the first portion 32 a of the negative electrode lead portion 32 is coated (arranged) with benzotriazole. As the benzotriazole, for example, 1,2,3-benzotriazole is suitable. The benzotriazole disposed on the surface of the first portion 32 a of the negative electrode lead portion 32 located in the peripheral portion 24 of the outer package 20 is between the negative electrode lead portion 32 and the first film 21 and the second film 22. The 1st negative electrode side creeping suppression part 41 (scramble suppression part) which suppresses the approach of the electrolyte solution to the is comprised.

  The second portion 32b is made of, for example, nickel. The first portion 32a and the second portion 32b are joined by, for example, ultrasonic welding or the like. The joint between the first portion 32a and the second portion 32b is provided closer to the cavity 23 than the negative electrode terminal 38 in the negative electrode lead portion 32 (see FIGS. 1 and 7). The second portion 32b of the negative electrode lead portion 32 is provided with a second negative electrode side creeping suppression portion 42 (scooping up) that suppresses the electrolyte from entering between the negative electrode lead portion 32 and the first film 21 and the second film 22. (Suppressing part).

  As shown in FIGS. 1 and 7, in the first portion 32 a of the negative electrode lead portion 32, a plurality of negative electrode lead through holes 35 penetrating in the overlapping direction are formed in a portion located in the peripheral portion 24 of the exterior body 20. (Communication part) is formed. Each negative electrode lead through-hole 35 has the first film 21 and the second film 22 welded and adhered inside thereof. The plurality of negative electrode lead through holes 35 are provided with a third negative electrode side creeping suppression unit 43 (a creeping suppression unit) that suppresses the ingress of the electrolyte between the negative electrode lead unit 32 and the first film 21 and the second film 22. ).

  Moreover, the sealing material 36 is arrange | positioned in the surface of the part located in the peripheral part 24 of the exterior body 20 among the 1st parts 32a of the negative electrode lead part 32 (refer FIG. 5). In the present embodiment, the sealing material 36 is disposed at a position where a plurality of negative electrode lead through holes 35 are formed. The sealing material 36 is formed by, for example, dissolving and applying a material containing blown asphalt in a solvent such as toluene. The sealing material 36 forms a fourth negative electrode side rising suppression portion 44 (a creeping suppression portion) that suppresses the ingress of the electrolyte between the negative electrode lead portion 32 and the first film 21 and the second film 22. ing. The sealing material 36 is desirably disposed so as to be continuous with both main surfaces and both end surfaces (both side surfaces) of the negative electrode lead portion 32. That is, it is desirable that the sealing material 36 is disposed over the entire circumference around the central axis along the extending direction of the negative electrode lead portion 32.

Hereinafter, the manufacturing method of the battery 1 of the present embodiment will be described. In addition, refer to FIGS. 1 to 5 for the reference numerals of the components of the battery 1 in the following description.
FIG. 8 is a flowchart illustrating the battery manufacturing method according to the embodiment. 9 to 20 are process diagrams showing a method for manufacturing a battery according to the embodiment. 9, FIG. 10, FIG. 12, FIG. 15, FIG. 17, and FIG. 18 are cross-sectional views taken along the line II-II in FIG. 11, FIG. 13, FIG. 14, FIG. 16, FIG. 19, and FIG. 20 are plan views corresponding to FIG.
As shown in FIG. 8, the manufacturing method of the battery 1 includes a first recess forming step S10, a positive electrode metal foil forming step S20, a positive electrode metal foil arranging step S30 (positive electrode current collector arranging step), and a positive electrode combination. Agent placement step S40, second recess formation step S50, negative electrode metal foil formation step S60, negative electrode metal foil placement step S70 (negative electrode current collector placement step), separator placement step S80, and negative electrode mixture placement A process S90, a sheet overlaying process S100, an ultrasonic welding process S110, a thermal welding process S120, and a film forming process S130 are provided.

  First, the first recess forming step S10 is performed. In 1st recessed part formation process S10, as shown in FIG. 9, the 1st sheet | seat 51 which is a laminate film which forms the 1st film 21 is drawn, and the 1st recessed part 21a is formed.

  Next, positive electrode metal foil forming step S20 is performed. In the positive electrode metal foil forming step S20, first, a positive electrode metal foil 52 (see FIG. 4) in which the positive electrode current collector 12 and the positive electrode lead portion 31 are integrated is formed from a metal foil such as nickel by press working or the like. At this time, a plurality of positive electrode lead through holes 34 are also formed at the same time.

  Next, positive electrode metal foil arrangement step S30 is performed. In the positive electrode metal foil arrangement step S30, as shown in FIGS. 10 and 11, the positive electrode current collector 12 of the positive electrode metal foil 52 is placed on the bottom surface of the first recess 21a of the first sheet 51, and the heater The positive electrode current collector 12 is welded to the bottom surface of the first recess 21a using a heating means 61 such as the above. At this time, the entire positive electrode current collector 12 may be welded to the bottom surface of the first recess 21a, or a part of the positive electrode current collector 12 may be welded to the bottom surface of the first recess 21a. . Thereby, the positive electrode current collector 12 is temporarily fixed to the first sheet 51.

  Next, positive electrode mixture arrangement step S40 is performed. In the positive electrode mixture arrangement step S40, the positive electrode mixture 13 is arranged on the positive electrode current collector 12, as shown in FIG. Further, an appropriate amount of the electrolytic solution E is disposed on the positive electrode mixture 13.

  Next, a second recess forming step S50 is performed. In the second recess forming step S50, as shown in FIG. 13, the second sheet 53, which is a laminate film for forming the second film 22, is drawn as in the first recess forming step, and the second recess 22a is formed. Form. Further, the positive electrode terminal exposure hole 25 and the negative electrode terminal exposure hole 26 are formed in the second sheet 53.

  Next, negative electrode metal foil forming step S60 is performed. In the negative electrode metal foil forming step S60, first, the negative electrode current collector 15 and the first portion 32a of the negative electrode lead portion 32 are integrated from a metal foil such as copper or copper plated with tin by pressing or the like. The negative electrode metal foil 54 is formed. At this time, a plurality of negative electrode lead through holes 35 are also formed at the same time. Subsequently, benzotriazole is disposed on the entire surface of the negative electrode metal foil 54. Examples of the method of arranging benzotriazole include a method of immersing the negative electrode metal foil 54 in a solution in which benzotriazole is dissolved in a solvent such as water, a method of attaching benzotriazole vapor to the negative electrode metal foil 54, and the like. There is. As a result, benzotriazole is disposed on the entire surface of the negative electrode current collector 15 and the first portion 32 a of the negative electrode lead portion 32. Further, the sealing material 36 is applied to the first portion 32 a of the negative electrode lead portion 32 of the negative electrode metal foil 54.

  Next, the metal foil arrangement process S70 for negative electrodes is performed. In the negative electrode metal foil arranging step S70, as in the positive electrode metal foil arranging step S30, the negative electrode current collector 15 in the negative electrode metal foil 54 is placed on the bottom surface of the second recess 22a of the second sheet 53, The negative electrode current collector 15 is welded to the bottom surface of the second recess 22a using a heating means such as a heater. At this time, the entire negative electrode current collector 15 may be welded to the bottom surface of the second recess 22a, or a part of the negative electrode current collector 15 may be welded to the bottom surface of the second recess 22a. . Thereby, the negative electrode current collector 15 is temporarily fixed to the second sheet 53. Subsequently, as shown in FIG. 14, the second portion 32 b formed of a metal foil such as nickel is bonded to the first portion 32 a of the negative electrode lead portion 32 by ultrasonic welding or the like.

  Next, separator arrangement process S80 is performed. In the separator placement step, as shown in FIGS. 15 and 16, first, the separator 17 is placed on the positive electrode mixture 13. At this time, the separator 17 is disposed so that the outer edge portion 17 a of the separator 17 is laminated on the opening periphery of the first recess 21 a in the first sheet 51. Subsequently, the outer edge portion 17 a of the separator 17 is welded to the first sheet 51 using a heating unit 62 such as a heater. At this time, the outer edge portion 17 a of the separator 17 may be welded to the first sheet 51 over the entire circumference, or a part of the outer edge portion 17 a of the separator 17 may be welded to the first sheet 51. Good. Thereby, the separator 17 is temporarily fixed to the first sheet 51.

Next, the negative electrode mixture arranging step S90 is performed. In the negative electrode mixture arrangement step S <b> 90, as shown in FIG. 17, the gel-like negative electrode mixture 16 is arranged on the separator 17.
Next, a sheet overlaying step S100 is performed. In the sheet superimposing step S100, as shown in FIG. 18, the second sheet 53 is placed on the first sheet 51 so as to sandwich the positive electrode mixture 13 and the negative electrode mixture 16 between the first recess 21a and the second recess 22a. Overlapping. As a result, the electrode body 10 is sandwiched between the first sheet 51 and the second sheet 53.

  Next, an ultrasonic welding step S110 is performed. In the ultrasonic welding step S110, the region R1 shown in FIG. 19 is ultrasonically welded so as to surround the electrode body 10, and the first sheet 51 and the second sheet 53 are welded.

  Next, heat welding process S120 is performed. In the heat welding step S120, a portion where the first sheet 51, the second sheet 53 and the positive electrode lead portion 31 overlap, and a portion where the first sheet 51, the second sheet 53 and the negative electrode lead portion 32 overlap (region R2 shown in FIG. 20). Is thermally welded by a heating means such as a heater.

Next, film formation process S130 is performed. In the film forming step S130, the first sheet 51 and the second sheet 53 which are overlapped and welded are punched into a desired plan view shape. Thereby, the exterior body 20 is formed.
Thus, the manufacture of the battery 1 shown in FIG. 1 is completed.

  As described above, in the battery 1 of the present embodiment, the portion of the negative electrode lead portion 32 located in the peripheral portion 24 of the exterior body 20 is between the negative electrode lead portion 32 and the first film 21 and the second film 22. The negative electrode side creeping suppression portions 41 to 44 that suppress the entry of the electrolytic solution into the anode are formed. According to this configuration, the electrolyte contained in the cavity 23 is formed between the negative electrode lead portion 32, the first film 21, and the second film 22 in the peripheral portion 24 of the exterior body 20 toward the outside of the exterior body 20. It can be suppressed by the negative-side scooping-up suppressing portions 41 to 44. Thereby, it can suppress that the cavity 23 and the exterior of the exterior body 20 connect between the negative electrode lead part 32 in the peripheral part 24 of the exterior body 20, and the 1st film 21 and the 2nd film 22. FIG. The same applies to the positive side creeping suppression unit 40. Therefore, it can suppress that electrolyte solution leaks.

  Further, the first negative electrode side creeping suppression portion 41 is formed by disposing benzotriazole on the surface of the negative electrode lead portion 32. According to this configuration, since the surface of the negative electrode lead portion 32 can be prevented from being altered by benzotriazole, the negative electrode lead portion 32, the first film 21, and the second film while the electrolyte alters the surface of the negative electrode lead portion 32. It can suppress entering into between 22. Therefore, the above-described scooping suppression portion can be easily formed. Therefore, the 1st negative electrode side creeping suppression part 41 can be formed easily.

  In addition, the second negative electrode side creeping suppression portion 42 has a configuration in which at least a portion of the negative electrode lead portion 32 located in the peripheral edge portion 24 of the exterior body 20 is formed of nickel. According to this structure, compared with the case where the part located in the peripheral part 24 of the exterior body 20 among the negative electrode lead parts 32 is formed with the copper generally used as a material which forms the negative electrode collector 15, The rate of entry of the electrolyte solution between the negative electrode lead portion 32 and the first film 21 and the second film 22 can be reduced. Thereby, the penetration of the electrolyte solution between the negative electrode lead portion 32 and the first film 21 and the second film 22 can be suppressed. Therefore, the second negative electrode side creeping suppression portion 42 can be easily formed.

  In addition, the third negative electrode side creeping suppression portion 43 is configured to be a negative electrode lead through hole 35 that penetrates the negative electrode lead portion 32 in the overlapping direction and closely contacts the first film 21 and the second film 22. According to this configuration, the first film 21 and the second film 22 are brought into close contact with each other in the negative electrode lead through hole 35. Therefore, in the region where the negative electrode lead through hole 35 is formed in the negative electrode lead portion 32, Also, the adhesion of the first film 21 and the second film 22 to the negative electrode lead portion 32 can be improved. Thereby, the penetration of the electrolyte solution between the negative electrode lead portion 32 and the first film 21 and the second film 22 can be suppressed. Therefore, the third negative electrode side creeping suppression portion 43 can be easily formed.

  Further, the fourth negative electrode side creeping suppression portion 44 is formed by disposing a sealing material 36 containing blown asphalt on the surface of the negative electrode lead portion 32. According to this configuration, compared to the configuration in which the negative electrode lead portion 32 and the first film 21 and the second film 22 are directly laminated, the gap between the negative electrode lead portion 32 and the first film 21 and the second film 22 is reduced. The rate of entry of the electrolyte into the can be reduced. Thereby, the penetration of the electrolyte solution between the negative electrode lead portion 32 and the first film 21 and the second film 22 can be suppressed. Therefore, the fourth negative electrode side creeping suppression portion 44 can be easily formed.

  In addition, in the present embodiment, since the sealing material 36 is disposed at a position where the plurality of negative electrode lead through holes 35 are formed, the third negative electrode side creeping suppression portion 43 and the fourth negative electrode side creeping up are provided. The suppression unit 44 is provided at the same position. Thereby, at the position where the third negative electrode side creeping suppression portion 43 and the fourth negative electrode side creeping suppression portion 44 are provided, the gap between the negative electrode lead portion 32 and the first film 21 and the second film 22 is provided. Ingress of the electrolyte can be more reliably suppressed.

  Further, the positive side creeping suppression portion 40 is configured to be a positive electrode lead through hole 34 that penetrates the positive electrode lead portion 31 in the overlapping direction and closely contacts the first film 21 and the second film 22. According to this configuration, the first film 21 and the second film 22 are brought into close contact with each other in the positive electrode lead through hole 34. Therefore, in the region where the positive electrode lead through hole 34 is formed in the positive electrode lead part 31, Also, the adhesion of the first film 21 and the second film 22 to the positive electrode lead portion 31 can be improved. Thereby, the penetration of the electrolyte solution between the positive electrode lead portion 31 and the first film 21 and the second film 22 can be suppressed. Therefore, it is possible to easily form the positive electrode side creeping suppression portion 40 that suppresses the ingress of the electrolytic solution between the positive electrode lead portion 31 and the first film 21 and the second film 22.

  In addition, the length dimension L2 of the portion of the negative electrode lead portion 32 that is located within the peripheral edge portion 24 and closer to the cavity 23 than the negative electrode terminal 38 is larger than the width dimension of the negative electrode lead portion 32. Therefore, a sufficient distance from the cavity 23 to the outside of the exterior body 20 can be secured for the electrolyte solution that enters between the negative electrode lead portion 32 and the first film 21 and the second film 22. The same applies to the positive electrode lead portion 31. Therefore, it can suppress that electrolyte solution leaks.

By the way, in the cavity 23, a region on the first film 21 side where the positive electrode mixture 13 is arranged and a region on the second film 22 side where the negative electrode mixture 16 is arranged are divided by the separator 17. ing. When the region where the positive electrode mixture 13 is disposed and the region where the negative electrode mixture 16 is disposed communicate with each other, the positive electrode mixture 13 is decomposed to generate gas, and the negative electrode current collector 15 is deteriorated by the gas. Battery performance may be reduced.
Therefore, in the present embodiment, the outer edge portion 17a of the separator 17 has a structure in which a separator through hole 17b that penetrates the separator 17 in the overlapping direction and closely contacts the first film 21 and the second film 22 is formed. . According to this configuration, since the first film 21 and the second film 22 enter and adhere to the separator through hole 17b, the first film 21 and the second film 22 are caught in the separator through hole 17b, and the first film 21 and It is possible to prevent the separator 17 from being displaced with respect to the second film 22. Thereby, it can prevent that the area | region where the positive mix 13 is arrange | positioned in the cavity 23, and the area | region where the negative mix 16 are arrange | positioned resulting from the position shift of the separator 17. FIG. Therefore, the battery performance can be prevented from deteriorating.

  In addition, the method for manufacturing the battery 1 of the present embodiment includes an ultrasonic welding process in which the first sheet 51 and the second sheet 53 are welded by ultrasonic welding so as to surround the electrode body 10, and the first sheet 51, A heat welding step of thermally welding a portion where the two sheets 53 and the negative electrode lead portion 32 overlap. According to this method, since the first sheet 51 and the second sheet 53 are welded by ultrasonic welding so as to surround the electrode body 10, the electrolyte contained in the cavity 23 together with the electrode body 10 is heated to form a gas. Can be prevented. Thereby, since it can prevent that the exterior body 20 expand | swells, the sealing precision of the cavity 23 can be improved. And since the part which the 1st sheet 51, the 2nd sheet | seat 53, and the negative electrode lead part 32 overlap is heat-welded, the negative electrode lead part 32, the 1st sheet | seat 51, and the 2nd sheet | seat 53 can be contact | adhered reliably. Therefore, in the battery 1, the ingress of the electrolyte solution between the negative electrode lead portion 32 and the first film 21 and the second film 22 can be suppressed.

  Moreover, since the manufacturing method of the battery 1 of the present embodiment includes the positive electrode metal foil arrangement step S30 for welding the positive electrode current collector 12 to the first sheet 51, the positive electrode current collector 12 is fixed to the first sheet 51. be able to. Thereby, it is possible to prevent the positional deviation of the positive electrode current collector 12 during manufacturing, and it is possible to prevent the positional deviation of the positive electrode current collector 12 in the finished battery 1. The same applies to the negative electrode metal foil arranging step S70. Therefore, the high quality battery 1 can be easily manufactured.

  Moreover, since the manufacturing method of the battery 1 of the present embodiment includes the separator arrangement step S80 for welding the separator 17 to the first sheet 51, the separator 17 can be fixed to the first sheet 51. Thereby, the position shift and the twist of the separator 17 at the time of manufacture can be prevented. Therefore, the battery 1 can be manufactured easily.

  In addition, in the manufacturing method of the battery 1 described above, the second recess forming step S50, the negative electrode metal foil forming step S60, and the negative electrode metal foil arranging step S70, the first recess forming step S10, the positive electrode metal foil forming step S20, and Although it is performed after the metal foil arrangement step S30 for positive electrode, it is not limited to this. 2nd recessed part formation process S50, metal foil formation process for negative electrodes S60, and metal foil arrangement process for negative electrodes S70 are ahead of 1st recessed part formation process S10, metal foil formation process for positive electrodes S20, and metal foil arrangement process for positive electrodes S30. May be performed in parallel or in parallel.

[Modification of Embodiment]
A battery 101 according to a modification of the embodiment will be described. In addition, about the structure similar to embodiment mentioned above, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
FIG. 21 is a plan view of a battery according to a modification of the embodiment.
In the embodiment shown in FIG. 1, the tip portions of the positive electrode lead portion 31 and the negative electrode lead portion 32 are located in the peripheral edge portion 24 of the exterior body 20, but the present invention is not limited to this. The tip portions of the positive electrode lead portion 131 and the negative electrode lead portion 132 may protrude from the exterior body 20 as in a modification of the embodiment shown in FIG.

  As shown in FIG. 21, the tip end portion of the positive electrode lead portion 131 is a positive electrode terminal 137 protruding from the exterior body 20. The length of the portion of the positive electrode lead portion 131 located in the peripheral edge portion 24 is longer than the length of the positive electrode terminal 137. The tip of the negative electrode lead portion 132 is a negative electrode terminal 138 protruding from the outer package 20. The length of the portion of the negative electrode lead portion 132 located in the peripheral portion 24 is longer than the length of the negative electrode terminal 138. A joint portion between the first portion 32 a and the second portion 132 b in the negative electrode lead portion 132 is located in the peripheral edge portion 24 of the exterior body 20. Accordingly, a part of the second portion 132b of the negative electrode lead portion 132 is located in the peripheral portion 24 of the exterior body 20, and the entire negative electrode terminal 138 protruding from the exterior body 20 is formed by the second portion 132b. ing.

Even the battery 101 configured as described above can achieve the same effects as the battery 1 of the embodiment described above.
Further, since the length of the portion of the negative electrode lead portion 132 located in the peripheral portion 24 is longer than the length of the negative electrode terminal 138, the portion of the negative electrode lead portion 132 that is located in the peripheral portion 24 occupies. A larger proportion can be secured. Thereby, the distance from the cavity 23 to the outside of the exterior body 20 can be increased with respect to the electrolyte solution that enters between the negative electrode lead portion 132 and the first film 21 and the second film 22. The same applies to the positive electrode lead 131. Therefore, it can suppress that electrolyte solution leaks.

The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.
For example, in each of the above embodiments, a silver oxide battery is described as an example of an alkaline battery, but the present invention is not limited to this. For example, an alkaline manganese battery or a battery using nickel oxyhydroxide as a positive electrode active material Etc.

  Moreover, in the said embodiment, although the exterior body 20 is formed in planar view rectangular shape, it is not limited to this, For example, you may form in trapezoid shape, circular shape, semicircle shape, etc. Further, according to the shape of the exterior body, the shape of the cavity and the electrode body accommodated in the cavity may be formed in an arbitrary shape such as a circular shape in a plan view.

  Further, in the above embodiment, the battery 1 includes four types of negative electrode side creeping suppression units 41 to 44 that suppress the entry of the electrolytic solution between the negative electrode lead unit 32 and the first film 21 and the second film 22. However, it is not limited to this. The battery may include any one to three negative electrode side creeping suppression units among the four types of negative electrode side creeping suppression units 41 to 44.

  In the above embodiment, benzotriazole is disposed on the entire surface of the negative electrode current collector 15 and the entire surface of the first portion 32a of the negative electrode lead portion 32, but the present invention is not limited to this. If the benzotriazole is disposed on the surface of at least the portion of the first portion 32a of the negative electrode lead portion 32 that is located in the peripheral portion 24 of the exterior body 20, the first negative electrode side creeping suppression portion 41 described above is provided. Can be formed.

  In the above embodiment, a plurality of the negative electrode lead through holes 35 are formed as the third negative electrode side creeping suppression portion 43, but the present invention is not limited to this, and there is one negative electrode lead through hole 35. Also good. Further, the third negative electrode side scooping suppression portion may penetrate the negative electrode lead portion 32 in the overlapping direction and may bring the first film 21 and the second film 22 into close contact, and may be a notch, for example.

  Further, the sealing material 36 may include a resin material having adhesiveness. Thereby, since the sealing material 36 can be more firmly adhered to the negative electrode lead portion 32, the first film 21, and the second film 22, the negative electrode lead portion 32, the first film 21, and the second film 22 The rate of entry of the electrolyte into the space can be further reduced.

  Moreover, in the said embodiment, the separator through-hole 17b is formed in the outer edge part 17a of the separator 17 as a separator communication part which penetrates the separator 17 in an overlapping direction and makes the 1st film 21 and the 2nd film 22 contact | adhere. However, it is not limited to this. The separator communication portion described above only has to penetrate the separator 17 in the overlapping direction and to bring the first film 21 and the second film 22 into close contact, and may be a notch, for example.

  Moreover, in the manufacturing method of the battery 1 in the above embodiment, in the heat welding step, the first sheet 51, the second sheet 53, and the positive electrode lead portion 31 overlap with each other, the first sheet 51, the second sheet 53, and the negative electrode lead portion. Although the part which 32 overlaps is heat-welded, it is not limited to this. In the heat welding step, at least a portion where the first sheet 51, the second sheet 53, and the negative electrode lead portion 32 overlap each other is thermally welded so that the negative electrode lead portion 32, the first sheet 51, and the second sheet 53 are firmly adhered. Therefore, the electrolyte solution can be prevented from entering between the negative electrode lead portion 32 and the first film 21 and the second film 22.

  Moreover, in the manufacturing method of the battery 1 in the above embodiment, when forming the electrode body 10, the positive electrode mixture 13, the separator 17, and the negative electrode mixture 16 are arranged in this order, but the present invention is not limited to this. That is, after the negative electrode mixture 16 is disposed on the negative electrode current collector 15, the separator 17 may be disposed on the negative electrode mixture 16, and the positive electrode mixture 13 may be disposed on the separator 17. In this case, when the separator 17 is disposed on the negative electrode mixture 16, it is desirable to weld the separator 17 to the second sheet 53 in the same manner as the separator disposing step S80 described above.

  Moreover, in the said embodiment, although the 4th negative electrode side creeping suppression part 44 is comprised by arrange | positioning metal foil formed with nickel etc. as a part of negative electrode lead part 32, it is limited to this. Not. The 4th negative electrode side creeping suppression part may be comprised by giving nickel plating to the surface of the part located in the peripheral part 24 of the exterior body 20 among negative electrode lead parts.

  Moreover, in the said embodiment, although the exterior body 20 is formed of two laminated films (the 1st film 21 and the 2nd film 22), it is not limited to this. The exterior body may be formed by folding a single laminate film and overlapping the electrode body 10 therebetween.

  Moreover, in the said embodiment, although the positive electrode lead parts 31 and 131 and the negative electrode lead parts 32 and 132 are directly pinched | interposed into the 1st film 21 and the 2nd film 22, it is not limited to this. The positive electrode lead portion and the negative electrode lead portion may be sandwiched and welded between the first film 21 and the second film 22 while being sandwiched between sealant films formed of a thermoplastic resin.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 1,101 ... Battery (alkaline battery) 10 ... Electrode body 11 ... Positive electrode 12 ... Positive electrode collector 13 ... Positive electrode mixture 14 ... Negative electrode 15 ... Negative electrode collector 16 ... Negative electrode mixture 17 ... Separator 17a ... Outer edge part 17b ... Separator through-hole (separator communication part) 20 ... exterior body 21 ... first film 22 ... second film 23 ... cavity 24 ... peripheral edge part 32, 132 ... negative electrode lead part 35 ... negative electrode lead through-hole (communication part) 36 ... sealing material 41 ... 1st negative electrode side creeping suppression part (cracking suppression part) 42 ... 2nd negative electrode side creeping suppression part (cracking suppression part) 43 ... 3rd negative electrode side creeping suppression part (cracking suppression part) 44... Fourth negative electrode side creeping suppression portion (scrolling suppression portion) 51... First sheet 53.

Claims (11)

A positive electrode having a positive electrode mixture and a positive electrode current collector, and an electrode body constituted by laminating a negative electrode having a negative electrode mixture and a negative electrode current collector with a separator interposed therebetween;
The first film and the second film are overlapped in the first direction with the electrode body interposed therebetween, and a cavity for accommodating the electrode body together with the electrolytic solution is formed between the first film and the second film. An exterior body having a peripheral edge portion in which the first film and the second film laminated around the cavity are in close contact with each other;
A negative electrode lead portion that conducts to the negative electrode current collector in the cavity and extends toward the outside of the exterior body through the first film and the second film laminated at the peripheral edge;
With
A portion of the negative electrode lead portion located in the peripheral portion is formed with a creeping suppression portion that suppresses the electrolyte from entering between the negative electrode lead portion and the first film and the second film. ,
The scooping suppression portion is configured such that only a portion of the negative electrode lead portion located outside the cavity and at least within the peripheral portion is formed of nickel.
An alkaline battery characterized by that. A positive electrode having a positive electrode mixture and a positive electrode current collector, and an electrode body constituted by laminating a negative electrode having a negative electrode mixture and a negative electrode current collector with a separator interposed therebetween;
The first film and the second film are overlapped in the first direction with the electrode body interposed therebetween, and a cavity for accommodating the electrode body together with the electrolytic solution is formed between the first film and the second film. An exterior body having a peripheral edge portion in which the first film and the second film laminated around the cavity are in close contact with each other;
A negative electrode lead portion that conducts to the negative electrode current collector in the cavity and extends toward the outside of the exterior body through the first film and the second film laminated at the peripheral edge;
With
A portion of the negative electrode lead portion located in the peripheral portion is formed with a creeping suppression portion that suppresses the electrolyte from entering between the negative electrode lead portion and the first film and the second film. ,
The scooping suppression part is formed by disposing a sealing material containing blown asphalt on the surface of the negative electrode lead part.
An alkaline battery characterized by that. A positive electrode having a positive electrode mixture and a positive electrode current collector, and an electrode body constituted by laminating a negative electrode having a negative electrode mixture and a negative electrode current collector with a separator interposed therebetween;
The first film and the second film are overlapped in the first direction with the electrode body interposed therebetween, and a cavity for accommodating the electrode body together with the electrolytic solution is formed between the first film and the second film. An exterior body having a peripheral edge portion in which the first film and the second film laminated around the cavity are in close contact with each other;
A negative electrode lead portion that conducts to the negative electrode current collector in the cavity and extends toward the outside of the exterior body through the first film and the second film laminated at the peripheral edge;
With
A portion of the negative electrode lead portion located in the peripheral portion is formed with a creeping suppression portion that suppresses the electrolyte from entering between the negative electrode lead portion and the first film and the second film. ,
The creeping suppression portion is formed by disposing at least a portion located in the peripheral portion of the negative electrode lead portion from nickel and disposing a sealing material containing blown asphalt on the surface of the negative electrode lead portion. Being
An alkaline battery characterized by that. On the surface of the pre-SL negative electrode lead portion, benzotriazoles are arranged,
The alkaline battery according to any one of claims 1 to 3, wherein: A positive electrode having a positive electrode mixture and a positive electrode current collector, and an electrode body constituted by laminating a negative electrode having a negative electrode mixture and a negative electrode current collector with a separator interposed therebetween;
The first film and the second film are overlapped in the first direction with the electrode body interposed therebetween, and a cavity for accommodating the electrode body together with the electrolytic solution is formed between the first film and the second film. An exterior body having a peripheral edge portion in which the first film and the second film laminated around the cavity are in close contact with each other;
A negative electrode lead portion that conducts to the negative electrode current collector in the cavity and extends toward the outside of the exterior body through the first film and the second film laminated at the peripheral edge;
With
A portion of the negative electrode lead portion located in the peripheral portion is formed with a creeping suppression portion that suppresses the electrolyte from entering between the negative electrode lead portion and the first film and the second film. ,
The scooping suppression portion is formed by disposing benzotriazole on the surface of the negative electrode lead portion.
An alkaline battery characterized by that. The front SL negative electrode lead portion, communication portion for adhering said first film and said second film together through the first direction are formed,
The alkaline battery according to any one of claims 1 to 5, wherein: The separator has an outer edge portion sandwiched between the first film and the second film laminated at the peripheral edge portion,
The outer edge portion is formed with a separator communication portion that penetrates the separator in the first direction and closely contacts the first film and the second film.
The alkaline battery according to any one of claims 1 to 6, wherein: It is a manufacturing method of the alkaline battery according to any one of claims 1 to 7,
An ultrasonic welding step of welding the first sheet forming the first film and the second sheet forming the second film by ultrasonic welding so as to surround the electrode body; and
A heat welding step of heat-welding a portion where the first sheet, the second sheet and the negative electrode lead portion overlap;
A method for producing an alkaline battery, comprising: A positive electrode current collector arranging step of welding the positive electrode current collector to the first sheet;
The method for producing an alkaline battery according to claim 8. A negative electrode current collector arranging step of welding the negative electrode current collector to the second sheet;
The method for producing an alkaline battery according to claim 8 or 9, wherein: A separator disposition step of welding the separator to any one of the first sheet and the second sheet;
The method for producing an alkaline battery according to any one of claims 8 to 10, wherein:

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