JPH11233093A - Alkaline dry battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an alkaline dry battery excelling in a high-load discharge characteristic and prevented from internally short-circuiting at the time of intermittent discharge. SOLUTION: In this alkaline battery, a two-layer structured separator made by sticking together, in a paper making process, a high-density layer composed of vinylon fiber and rayon fiber, and a low-density layer similarly composed of vinylon fiber and rayon fiber, is used as separator 3, and the weight of the high-density layer ranges from 21 to 25 g/cm<2> , the weight of the low-density layer from 13 to 17 g/cm<2> , and the weight of the separator as a whole from 34 to 42 g/cm<2> .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an alkaline dry battery,
In particular, it relates to improvement of the separator.

[0002]

2. Description of the Related Art A separator of an alkaline dry battery is interposed between a positive electrode mixture and a gelled zinc negative electrode to hold an electrolyte and to separate both electrodes. Along with the pursuit of higher quality such as improved safety and long-term storage, technical requirements for separators are becoming more sophisticated.

[0003] Generally, a separator of an alkaline dry battery includes a dry non-woven fabric or a wet non-woven fabric made of synthetic fibers having excellent alkali resistance (such as vinylon fibers, polyamide fibers, vinylon fibers, and polyolefin fibers), or a liquid-absorbing material which is made of a liquid absorbing material. A nonwoven fabric mixed with alkali-resistant natural fibers (such as linter pulp and mercerized wood pulp) and regenerated fibers (rayon fibers) having good liquid retention properties is used.

[0004] Nonwoven fabrics currently used as separators for alkaline dry batteries include vinylon rayon nonwoven fabric, polyamide nonwoven fabric, polyolefin rayon nonwoven fabric, vinylon paper, vinylon rayon paper, vinylon rayon paper.
There are linter pulp paper and vinylon mercerized pulp paper.

[0005] Of these, vinylon paper is often called paper rather than nonwoven fabric. Vinylon fiber is manufactured by wet method (paper machine) after blending unacetalized polyvinyl alcohol fiber (easily soluble fiber) with acetalized polyvinyl alcohol fiber (slightly soluble fiber) and uniformly dispersing it in water. . In the bonding between the fibers, the moisture in the wet paper is turned into warm water by a heat dryer to dissolve the easily soluble fibers, and as the drying proceeds, the remaining fibers are joined at the cross-contact points of the hardly soluble fibers and joined. Both of these fibers have a hydrophilic group, and the liquid retention property is improved by reducing the blending ratio of the easily soluble fiber. Although this paper is often used alone, it may be used in combination with another nonwoven fabric (paper) having a high liquid retention property.

[0006] Vinylon rayon paper is manufactured in the same manner as vinylon paper, but has a high liquid retaining property in which rayon fiber is blended, and has LR20 (single type) and LR20.
14 (single-type). Those manufactured as a dry nonwoven fabric are used in combination with cellophane.

Further, vinylon mercerized pulp paper is
The production method is the same as that of vinylon paper, but it contains mercerized pulp and is excellent in liquid retention and alkali resistance. Like linter pulp, it is fibrillated and is suitable for applications requiring denseness. This paper is also used alone.

The separator of the alkaline dry battery is interposed between the positive electrode mixture and the gelled zinc negative electrode, holds the electrolytic solution, and plays a role of isolating both electrodes.
The following two points can be cited as main functions required for a separator of an alkaline dry battery. 1) Excellent electrolyte retention, good ionic conductivity, and low electric resistance. 2) By preventing the product of the gelled zinc negative electrode from being generated in the separator, an internal short circuit of the battery is prevented.

As a method of improving the liquid retaining property of the electrolyte, a material having more hydrophilic property is used for selecting a material of the separator, and a gap between fibers (porosity) is adopted by using a material having a large fiber diameter. ) Is increased. Rayon fibers and natural fibers are considered to have excellent holding properties in that the fibers themselves swell with an electrolyte.

On the other hand, as a method for preventing an internal short circuit of a negative electrode product, it is general to increase the compactness by reducing the fiber diameter of the material or mixing natural fibers containing a large amount of α-cellulose component.

[0011]

However, the liquid retaining property and the denseness of the electrolytic solution are contradictory. Usually, the liquid retaining property is suppressed to some extent by increasing the denseness to the extent that an internal short circuit does not occur. . For this reason, the storage stability and reliability of the battery are ensured, but the level of high-load discharge characteristics and intermittent discharge characteristics is not always satisfactory.

It is an object of the present invention to solve the above-mentioned problems and to provide an alkaline dry battery having excellent high-load discharge characteristics and preventing an internal short circuit during intermittent discharge.

[0013]

In order to achieve the above object, the present invention provides a separator having a density difference in a thickness direction.

(1) The invention according to claim 1 is directed to an alkaline dry battery in which a separator is interposed between a positive electrode mixture and a gelled zinc negative electrode to isolate both electrodes and to hold an electrolytic solution in the separator. And a separator having a two-layer structure in which a high-density layer made of vinylon fiber and rayon fiber and a low-density layer made of vinylon fiber and rayon fiber are bonded together in the papermaking process.

In this case, the separator interposed between the positive electrode mixture and the gelled zinc negative electrode, while the high density layer side greatly contributes to the separation between the positive electrode mixture and the gelled zinc negative electrode, Since the low-density layer greatly contributes to holding the electrolyte, the overall liquid retention rate is higher than when a conventional single-layer separator with no density difference is used, resulting in higher load. The continuous discharge characteristics of the discharge (1500 mA) are improved.

In the case where the electrolyte comprises a 40% aqueous potassium hydroxide solution, the liquid retention rate of the 40% aqueous potassium hydroxide solution in the separator is 500 wt% to 650 wt% (claim 4). The improvement is about 1.5 to 1.9 times that of the conventional liquid retention rate of 340 wt%.

[0017] The vinylon fiber is divided into a high density layer and a low density layer.
The reason why the layers are commonly used is that, besides having the characteristics required for a normal separator, there is an advantage that the layers can be heat-sealed at the time of winding. In addition, the reason for using the rayon fiber both in the high-density layer and the low-density layer is that the rayon fiber itself has a property of swelling with the electrolytic solution, and that the fiber diameter can be adjusted or the fibrillation can be easily performed to control the density, Further, the denseness tends to be higher than when mercerized pulp is used.

In the present invention, the two layers of the high-density layer and the low-density layer are laminated in advance in a papermaking process and are formed as one sheet of paper, so that the handling is easy.

(2) The separator is preferably arranged so that the low-density layer is located on the positive electrode mixture side and the high-density layer is located on the gelled zinc negative electrode side. With this configuration, the high-density layer constituting the separator blocks the passage of the product on the negative electrode side, and the low-density layer holds the electrolyte required at the time of discharge and contributes to the improvement of high-load discharge characteristics. The improvement of the high-load discharge characteristics is due to the fact that the separator has a two-layer structure of a high-density layer and a low-density layer, so that the liquid retention rate is increased and the low-density layer is located on the positive electrode mixture side. This is considered to be because the amount of the electrolyte in the positive electrode portion increases, and the utilization rate of high-load discharge increases. It is not preferable to reverse the arrangement of the separator so that the positive electrode mixture is located on the high-density layer side of the separator, because the volume of the gel negative electrode decreases by about 30% due to swelling on the low-density layer side.

(3) The separator has a high density layer having a basis weight of 21 to 25 g / m ² and a low density layer having a basis weight of 13 to 1
7 g / m2, the basis weight of the entire separator is 34 to 42 g / m2.
m ² is preferable (claim 3).

As described above, by increasing the liquid retention rate by forming the separator as a two-layer structure of a high-density layer and a low-density layer, the separator is arranged so that the low-density layer is on the positive electrode mixture side, and the positive electrode part is electrolytically treated. By increasing the amount of liquid to increase the utilization rate of high-load discharge, the characteristics of 1500 mA high-load discharge are improved.
However, this alone gives unsatisfactory intermittent discharge (3.9 Ω 5 minutes × 2 times / day (Min)) characteristics.
That is, the intermittent discharge characteristic is 3.9Ω 5 minutes × 2 times / day (Min)
The duration (discharge concentration) is usually about 360 minutes as a guideline for preventing an internal short circuit from occurring early, but two to three of the prototype batteries go up to a discharge time of 360 minutes. The rest causes an internal short circuit on the way, and the intermittent discharge ends in a discharge time of about 320 minutes.

Therefore, the basis weights of the high-density layer side and the low-density layer side are gradually increased, and at any point in time, 3.9 Ω 5 minutes × 2 times /
Examining whether the intermittent discharge abnormality on the day (Min) disappears, the basis weight of the high-density layer is 21 to 25 g / m ² , the basis weight of the low-density layer is 13 to 17 g / m ² , When the grammage was in the range of 34 to 42 g / m ² , the standard of the discharge time of 360 minutes was achieved for the intermittent discharge of 3.9Ω5 minutes × 2 times / day (Min). At this time, the liquid retention rate of the 40% aqueous potassium hydroxide solution in the separator is also included in the range of 500 wt% to 650 wt% (Claim 4).

(4) The invention according to claim 5 is that the granular polymer put in the gelled zinc negative electrode is a sodium polyacrylate polymer polymerized by bulk polymerization.

In the above intermittent discharge test, 2
~ 3 batteries go up to 360 minutes of discharge time, but the reason why the remaining prototype batteries cause an internal short circuit on the way is as follows.
It is considered as follows. That is, at the end of discharge, the electrolyte on the negative electrode side runs short. Zinc oxide does not dissolve and forms in the separator, which causes an internal short circuit.

Then, instead of the polymer produced by the conventional suspension polymerization, a polymer of sodium polyacrylate polymerized by bulk polymerization was used as the granular polymer to be put in the gelled zinc negative electrode. 2. Intermittent discharge
9Ω 5 minutes x 2 times / day (Min) Discharge time 360
Thus, a battery having good characteristics exceeding 100 minutes was obtained. That is, according to the fifth aspect of the present invention, the polymer obtained by bulk polymerization is put into the gelled zinc negative electrode, whereby the high-load discharge characteristics are further improved, and the internal short circuit at the time of intermittent discharge is completely prevented. be able to.

This is probably because the polymer produced by bulk polymerization is less soluble in aqueous potassium hydroxide than the polymer produced by suspension polymerization. The fact that the polymer is difficult to dissolve in the aqueous potassium hydroxide solution means that the viscosity of the gelled zinc negative electrode is unlikely to increase and the aqueous potassium hydroxide solution in a free state is abundant, and this electrolytic solution is generated in the separator during discharge. It seems that the internal short circuit can be prevented by dissolving the zinc oxide.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described mainly with reference to examples.

As shown in FIG. 1, the AM-type cylindrical alkaline battery to which the present invention is applied is a positive electrode mixture 2 formed into a ring-shaped core outside a separator 3 in which a separator base paper is flat-wound in a cylindrical shape. Are arranged, and the separator 3
The gelled zinc negative electrode 4 in a gel state is arranged on the inner side, thereby forming a power generating element having a coaxial structure. The power generating element having the coaxial structure is hermetically sealed in a cylindrical battery case including the cylindrical positive electrode can 1, the gasket 6, and the negative electrode terminal plate 7. A negative electrode current collector 5 is inserted into the negative electrode mixture 4,
It is connected to the negative electrode terminal 7 by welding. A conductive film (not shown) is formed on the inner surface of the positive electrode can 1, and the positive electrode mixture 2 is brought into contact with the conductive film to improve discharge performance and utilization. In addition, 8 is an isolating agent, 9 is a positive electrode terminal,
Reference numeral 10 denotes a meta label.

In the LR6 configuration diagram of FIG. 1, all the battery tests were performed using LR6 (AA type). Positive electrode mixture 2
Has a ratio of electrolytic manganese dioxide and expanded graphite of 20:
The mixture obtained in 1 was granulated and formed. The gelled zinc negative electrode 4 was used by mixing zinc powder / polyacrylic acid / granular sodium polyacrylate / 40% aqueous solution of potassium hydroxide / zinc oxide. The separator 3 was triple-wound, and the bottom was heat-sealed for use.

The separator 3 is interposed between the positive electrode mixture and the gelled zinc negative electrode to hold the electrolytic solution and to separate the two electrodes. The separator 3 has a high density layer made of vinylon fiber and rayon fiber. It also has a two-layer structure in which a low density layer made of vinylon fiber and rayon fiber is bonded in a paper making process. When processing a separator using this two-layer structure separator having a high-density layer and a low-density layer, a gel zinc anode is disposed on the high-density layer side, and a positive electrode mixture is disposed on the low-density layer side. did. Conversely, the volume of the gel negative electrode decreases by about 30% due to swelling on the low density layer side.

Tables 1 and 2 show the composition of the separator and the results of the discharge test in the prototype LR6 type alkaline batteries (prototype examples No. 1 to No. 15). In the table, the left side shows the composition of the high-density layer and the low-density layer constituting the separator, and the right side in turn shows the total basis weight (g / c) of the separator.
m ² ), liquid retention rate of separator (wt%), gel negative electrode amount index (index of how much gel negative electrode is included when conventional gel negative electrode amount is 100), constant current high load discharge of 1500 mA (Min) test result, intermittent discharge 3.9Ω
The test results of 5 minutes × 2 / day (Min) are shown.

[0032]

[Table 1]

In adopting a two-layered separator composed of a high-density layer and a low-density layer, first, as a conventional example, vinylon fiber, mercerized pulp, and rayon fiber are put into the high-density layer side. For the low density layer, a combination of vinylon fibers and rayon fibers was used. Prototype example no. Numeral 1 indicates the composition of this conventional separator, which is a single layer composed of vinylon fibers and mercerized pulp. The liquid retention rate is 340 wt%, 15
The duration of the high load discharge of 00 mA (Min) is 20.0
Min, the intermittent discharge is 3.9 Ω, 5 minutes × 2 / day (Min), and the discharge time is 340 to 350 minutes. In the intermittent discharge test of 3.9 Ω 5 minutes × 2 / day (Min), the time at which no internal short circuit is considered to occur is the discharge time of around 360 minutes.
The value of 50 minutes is approximately in this desired discharge time range,
It can be said that the intermittent discharge can be completed by preventing the internal short circuit.

In Table 1, the prototype No. 2-No. 5
Is a combination of vinylon fibers, mercerized pulp, and rayon fibers charged into the high-density layer side, and vinylon fibers and rayon fibers charged into the low-density layer. All are high load discharge 1500mA
The (Min) test result exceeds the conventional value of 20.0 minutes, and it is recognized that the high-load discharge characteristics can be improved by about 10%. The reason is that the liquid retention rate is
What was only about 40 wt% was changed to 1.5 to 1.9.
As a result, the amount of electrolyte in the positive electrode part increased considerably, the utilization rate of high-load discharge increased,
It is considered that the high-load discharge characteristics of 1500 mA are improved.

In any case, the characteristics of high load discharge 1500 mA (Min) can be improved by using a swelling-type double-structured separator and having the positive electrode as much as possible with an electrolytic solution. However, the prototype No. 2-No. 5
Even if the basis weight of the separator using the same material is varied, as long as the paper made by adding vinylon fiber, mercerized pulp, and rayon fiber is used for the high-density layer, A short circuit will occur. That is, the prototype example No. In the case of one conventional separator,
While the intermittent discharge time was 340 to 350 minutes, the internal short circuit was almost prevented and the intermittent discharge was completed. On the other hand, the prototype example No. using the separator having the two-layer structure of the high-density layer and the low-density layer was used. Two
No. In the case of No. 5, a discharge time of at most about 300 minutes can be obtained.

Therefore, the prototype No. 6-No. As for No. 13, a separator having a double structure of vinylon fiber and rayon fiber was used except for the mercerized pulp. The reason why the mercerized pulp was removed was that the higher the ratio of rayon fibers except for the mercerized pulp, the higher the density tended to be. Table 2 shows the results.

[0037]

[Table 2]

The prototype No. 6-No. In the case of No. 13, the grammage of the high-density layer side and the low-density layer side is gradually increased, and at any point in time, 3.9Ω5 minutes × 2 times / day (Min)
It was investigated whether abnormalities of intermittent discharge disappeared.

Prototype Example No. 8 to No. According to the thirteenth separator, a separator having an intermittent discharge time of about 360 minutes can be obtained. Among them, the prototype No. 8 to No.
10, the basis weight of the high-density layer of the separator is 21 to 21
25 g / m ² , the basis weight of the low density layer is 13 to 17 g / m
² , the separator having a basis weight in the range of 34 to 42 g / m ² is listed as an example of the present invention, and the duration of the high load discharge of 1500 mA (Min) is 23. It is 3.9 Ω 5 minutes × from 0.5 minutes to 24.5 minutes
The battery exhibits excellent battery characteristics of an intermittent discharge of 2 / day (Min) with a discharge time of 320 to 360 minutes. In addition, No. Two
No. All of the separators No. 13 had a liquid retention rate of a 40% aqueous potassium hydroxide solution of 500 wt% to 650 wt%. It is higher than the liquid retention rate of 1.

Prototype Example No. 11, No. 12, No. 1
Battery No. 3 has an intermittent discharge time to the extent that internal short circuit does not pose a problem. However, the separator has an increased basis weight and the separator is accordingly thicker, and the amount of gelled negative electrode becomes extremely small. Thus, the high-load discharge characteristics of 1500 mA deteriorate, and the discharge characteristics of other 10Ω continuous discharge and 75Ω continuous discharge not shown in Table 2 also deteriorate. This means that it is not necessary to increase the basis weight of the separator too much.
8 to No. 10 is a range which is an embodiment of the present invention. In addition, the prototype example No. 12, the high load discharge characteristic of 1500 mA seems to be good, but the gel negative electrode amount index is 9
2 and the amount of zinc drops by about 10%, for example, where another 10Ω discharge should normally last 18 to 19 hours,
It lasts only about 17 hours.

As already described, the prototype No. 8 to N
o. According to the two-layer separator having the composition of No. 13, 3.9 was obtained.
A battery having an intermittent discharge time of about 360 minutes can be obtained with Ω 5 minutes × 2 times / day (Min). However, the prototype battery 2
The remaining three batteries go up to 360 minutes, but the remaining batteries finish intermittently at about 320 minutes on the way, causing an internal short circuit.

The reason is considered as follows. That is, at the end of discharge, the electrolyte on the negative electrode side runs short. Zinc oxide does not dissolve and forms in the separator, which causes an internal short circuit.

Therefore, the kind of the granular polymer put in the gelled zinc negative electrode was changed to a sodium polyacrylate polymer polymerized by bulk polymerization. That is, in the case of the batteries shown in Tables 1 and 2, all of the granular polymers were polymers polymerized by a conventionally used suspension polymerization (trade name Q
P-3, Nippon Pure Chemical Co., Ltd.), but was replaced with a polymer (product name QG-220, Nippon Pure Chemical Co., Ltd.) polymerized by bulk polymerization (prototype example No. 7A).
-No. 10A), and a discharge test was performed. Table 3 shows the results.

[0044]

[Table 3]

As shown in Table 3, the prototype no. 8A, N
o. 9A, no. For a separator having a basis weight of 10 A separator (Example), 3.9Ω5 minutes × 2 times / day (Min)
The intermittent discharge time was 360 to 370 minutes, and no internal short circuit occurred. Of course, a high-load discharge of 1500 mA also shows a high duration of 24.5 to 25.0 minutes. 1 (see Table 1) duration 20
The duration was about 20% longer than the minutes.

Similarly, a prototype battery (prototype example No. 7B) was replaced with a polymer polymerized by bulk polymerization (trade name: Sunfresh DK-200, Sanyo Chemical Industry Co., Ltd.).
-No. 10B). Table 4 shows the results.

[0047]

[Table 4]

As can be seen from Table 4, the prototype No. 8
B, No. 9B, no. 10B separator (Example)
3.9 Ω 5 minutes x 2 times / day (Min)
The intermittent discharge time was as long as 360 minutes to 370 minutes, and no internal short circuit occurred. Also, the high load discharge of 1500 mA shows a high value of 25.5 minutes to 26.0 minutes. The characteristics were improved by about 20% compared to 1.

The reason why the intermittent discharge time is excellent is considered to be that the polymer produced by bulk polymerization is less soluble in the potassium hydroxide solution than the polymer produced by suspension polymerization. The fact that the polymer is difficult to dissolve in the aqueous potassium hydroxide solution means that the viscosity of the gelled zinc anode is difficult to increase and the potassium hydroxide solution in a free state is abundant, and this electrolyte is generated in the separator during discharge. It seems that the internal short circuit can be prevented by dissolving the zinc oxide.

Returning to Table 2, the prototype No. 14 is a separator without a two-layer structure of a high-density layer and a low-density layer,
Prototype example no. This is an example in which a single layer having the same total basis weight of 42 g / m ^{2 as} that of No. 10 is formed. Prototype example no. 14 and the prototype No. From the comparison of 10, N with the density difference
o. It can be seen that 10 (this embodiment) is more excellent in characteristics.

Similarly, the prototype No. No. 15 is a prototype example No. 15 without using a separator having a two-layer structure of a high-density layer and a low-density layer. This is an example in which a single layer having the same total basis weight of 28 g / m ^{2 as} that of No. 6 is formed. Prototype example no. 15 is the liquid retention rate 75
The characteristics of 1500 mA discharge are excellent because it is as high as 0 wt%, but the intermittent discharge time is extremely low as 220 to 280 minutes because zinc oxide in the formed separator cannot be prevented because the high density layer is not provided. Has become.

On the other hand, the prototype No. 6 is 560wt% liquid retention
Is not extremely high, the 1500 mA discharge is 22.5 minutes, and the prototype No. Although the tone was slightly lower than that of Prototype No. 15, the intermittent discharge time was 280 to 340 minutes, which was the prototype No. The characteristic value is much better than that of No. 15.

As described above, by using a separator in which the high-density layer has a dense property and the low-density layer has a liquid retaining property, and using a polymer obtained by bulk polymerization in the gelled zinc negative electrode,
Batteries excellent in high-load discharge characteristics and storage characteristics can be supplied.

Although the above description has been made on the separator in which the separator base paper is flat-wound in a cylindrical shape, as shown in FIG. 2, the present invention can also be applied to the separator 3 in which the separator base paper is spirally wound. The battery of FIG.
The sheet-shaped positive electrode mixture 2, the separator 3, and the gelled zinc negative electrode 4 are sequentially superimposed and wound in a spiral to form a cylindrical power generating element, which is housed in a can 1. . In addition, 11 is a negative electrode lead plate, 12 is an insulating bottom plate, 15 is a lead, 16 is a sealing plate, 17 is a positive electrode cap / positive terminal, 18 is an insulating gasket, and 20 is a safety valve.

[0055]

As described above, according to the present invention, the following excellent effects can be obtained.

(1) According to the invention as set forth in claims 1 to 5, a high-density layer made of vinylon fiber and rayon fiber and a low-density layer made of vinylon fiber and rayon fiber are provided on the separator of the alkaline dry battery. Is used in a papermaking process using a two-layer separator, the high-density layer constituting the separator blocks the passage of the product on the negative electrode side,
Since the low-density layer retains the necessary electrolyte during discharge, the liquid retention rate is higher than when a conventional separator consisting of a single layer is used without making a difference in density, resulting in a higher battery Load discharge characteristics can be improved.

(2) According to the second aspect of the present invention, the separator is arranged so that the low density layer is located on the positive electrode mixture side and the high density layer is located on the gelled zinc negative electrode side. A swelling type separator in which the electrolyte is held in the positive electrode as much as possible can be configured. That is, the separator has a two-layer structure of a high-density layer and a low-density layer, so that the liquid retention rate is increased. In addition, since the low-density layer is located on the side of the positive electrode mixture, the amount of electrolyte in the positive electrode part is small. And the utilization rate of high-load discharge increases, so that high-load discharge characteristics can be further improved.

(3) According to the invention described in claim 3, the basis weight of the high-density layer of the separator is 21 to 25 g / m ² , the basis weight of the low-density layer is 13 to 17 g / m ² , Is set so as to be 34 to 42 g / m ² , and for the intermittent discharge characteristic of 3.9 Ω, 5 minutes × 2 times / day (Min), a guideline of 360 minutes in which the abnormality of the intermittent discharge is eliminated is achieved. . Therefore, a battery having excellent high-load discharge characteristics and storage characteristics can be provided.

(4) According to the fourth aspect of the present invention, since the liquid retention of the 40% potassium hydroxide aqueous solution in the separator is in the range of 500 wt% to 650 wt%, it is possible to improve the high load discharge characteristics as compared with the prior art. Can be.

(5) According to the fifth aspect of the present invention, since a granular polymer obtained by bulk polymerization is used as the granular polymer in the gelled zinc loading electrode, it is produced by conventional suspension polymerization. The duration of the high load discharge and the intermittent discharge can be further extended as compared with the case where the polymer is used.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an alkaline dry battery according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an alkaline battery according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positive electrode can 2 Positive electrode mixture 3 Separator 4 Gelled zinc negative electrode 5 Negative current collecting rod 6 Sealing gasket 7 Negative terminal plate 8 Isolating agent 9 Positive terminal 10 Metal label

Claims (5)

[Claims] 1. An alkaline dry battery in which a separator is interposed between a positive electrode mixture and a gelled zinc negative electrode to isolate both electrodes and hold an electrolytic solution in the separator, wherein the separator includes vinylon fiber and rayon fiber. An alkaline dry battery comprising a separator having a two-layer structure in which a high-density layer composed of a high-density layer and a low-density layer also composed of vinylon fiber and rayon fiber are bonded in a papermaking process. 2. The alkaline dry battery according to claim 1, wherein the separator is arranged such that a low-density layer is located on the positive electrode mixture side and a high-density layer is located on the gelled zinc negative electrode side. . 3. The separator according to claim 1, wherein the high-density layer has a basis weight of 21 to 25 g / m ² , and the low-density layer has a basis weight of 13 to 1 g / m ² .
7 g / m ² , the basis weight of the entire separator is 34 to 42 g / m ²
The alkaline dry battery according to claim 1 or ² , wherein m2. 4. The electrolyte according to claim 1, wherein the electrolyte comprises a 40% aqueous potassium hydroxide solution, and a liquid retention rate of the 40% aqueous potassium hydroxide solution in the separator is 500 wt% to 650 wt%. 3. The alkaline dry battery according to 3. 5. The alkaline dry battery according to claim 1, wherein the granular polymer in the gelled zinc negative electrode is a sodium polyacrylate polymer polymerized by bulk polymerization.