JP2005332613A - Alkaline primary battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To install explosion-proof construction stably operating without increasing cost in an alkaline primary battery of the smallest size having a diameter of 8±0.3 mm. <P>SOLUTION: A resin sealing body 2 sealing the opening end of a battery can 5 in which a power generation element is housed is capable of widening a pressure receiving area receiving inner pressure even in the battery having small diameter by regulating the inner diameter and the outer diameter of a shaft part 2a through which an electron collector 3 is passed and forming the pressure receiving part 2b connecting the shaft part 2a and the sealing part 2c in a cone having a prescribed angle, and by forming a thin part 2f in the pressure receiving part 2b, abnormal increase in the inner pressure in the battery can 5 is detected with the pressure receiving part 2b, the thin part 2f is broken to release the inner pressure to the outside. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an alkaline primary battery using an alkaline electrolyte (potassium hydroxide aqueous solution), and more particularly to an alkaline primary battery that can provide an explosion-proof structure for a cylindrical battery having a very small diameter.

  Alkaline primary batteries called alkaline dry batteries, nickel dry batteries, and oxyride dry batteries use an aqueous potassium hydroxide solution as an electrolyte. This electrolytic solution is very corrosive and has high permeability, so that it is easy to leak, and if it leaks, there is a risk of damaging equipment and human skin. Therefore, a stronger sealing structure is required than the manganese dry batteries that have been widely used heretofore. In addition, since a large discharge current can be obtained as compared with a manganese dry battery, when an external short circuit occurs, a large current flows and heat is generated, which may lead to battery explosion. In addition, even if the battery is used incorrectly, such as charging a dry cell, there is a risk of leakage or rupture with the generation of gas.

  In order to prevent the battery from leaking or bursting, an explosion-proof structure is provided in the cylindrical alkaline primary battery. The explosion-proof structure is configured to form a thin part in the resin sealing body that seals the opening of the battery can, and when the internal pressure of the battery can abnormally rises due to the generation of gas, the thin part is broken to release the gas to the outside. The In the cylindrical alkaline primary battery marketed in Japan at present, for example, the diameter: 34.2 mm, the height: 61.5 mm, single size 1 to diameter: 12.0 mm, height: 30.2 mm, single size Everything has an explosion-proof structure.

  As the diameter of the battery becomes smaller, it becomes difficult to provide an explosion-proof structure. Among the alkaline dry batteries manufactured in Japan today, the smallest one is the AAA size, and its diameter is 10.5 mm. However, an explosion-proof structure is provided. There is a cylindrical alkaline dry battery that should be referred to as a size having a smaller diameter or a single size, and is marketed as an LR8D425 alkaline battery in the United States, but is also commercially available outside of Europe and the United States. Although it is manufactured as a unit cell constituting a prismatic alkaline battery (6LR61) having a nominal voltage of 9 V in Japan, it is not manufactured as a single unit. The LR8D425 size alkaline battery has a diameter of 8.0 mm (tolerance: 0.3 mm) and a height of 42.5 mm (maximum: 42.5 mm).

  As shown in FIG. 3, the LR8D425 size alkaline battery has a negative electrode active material and an electrolyte solution in a battery can 51 formed in a bottomed cylindrical shape through a separator 54 inside a cylindrical positive electrode mixture 52. And a resin sealing body 55 in which a current collector 56 inserted into the negative electrode gelling agent 53 is inserted in the center is disposed at the opening end of the battery can 51. The inside of the battery can 51 is hermetically sealed by crimping the opening end of the battery can 51, and the top of the current collector 56 exposed through the resin sealing body 55 is a negative electrode, and the cylindrical shape with the battery can 51 as a positive electrode It is composed of dry batteries. Since this alkaline battery has a small diameter and a small planar area of the resin sealing body 55, a sufficient pressure-receiving area for receiving the internal pressure in the battery can 51 cannot be obtained, and a thin-walled portion that breaks due to abnormal internal pressure, that is, an explosion-proof structure is provided. I could not.

  This LR8D425 size alkaline battery can be configured as a prismatic alkaline battery having a nominal voltage of 9 V as described above by connecting six batteries in series and accommodating them in a metal case. Thus, even when the unit cell is ruptured due to an abnormal increase in internal pressure, it is possible to prevent leakage of the electrolyte-containing material with danger. By adding positive and negative terminals to the 6LR61 unit cell, an LR8D425 size alkaline battery is obtained. However, if an alkaline battery of LR8D425 size is sold as a single battery as a single battery, it does not have an explosion-proof structure. Therefore, if an incorrect use such as an external short circuit or charging is performed, the internal pressure may rise abnormally and lead to a rupture. Yes, it cannot be marketed as a single alkaline battery. LR8D425 size alkaline primary batteries, which have higher capacity than manganese batteries, are demanded to reduce the size and weight of batteries that are power supplies as devices such as portable devices become smaller and lighter and have higher functionality. The manufacture of is desired.

  An LR8D425 size alkaline dry battery provided with an explosion-proof structure has been proposed to enable the manufacture of a single LR8D425 size alkaline dry battery (see Patent Document 1). In this battery, as shown in FIG. 4, circular recesses 68 and 69 are formed from both sides in the thickness direction at one location of a resin sealing body 65 that seals the opening end of the battery can 61, and the circular recesses 68 and 69 are bumped. A rupturable membrane 67 is formed during the fit. When the internal pressure of the battery can 61 rises abnormally, the rupturable film 67 breaks and releases the gas to the outside, so that the battery can be prevented from bursting.

JP-T-2002-516462 (pages 13-16, FIG. 1)

  The rupturable film 67 having an explosion-proof structure in the above-described prior art must have a small area (1.5 mmφ in the disclosed embodiment) in order to form part of the resin sealing body 65 having a small area for receiving internal pressure. In order to ensure breakage due to abnormal internal pressure, it is necessary to form an extremely thin film (thickness: 0.1 mm or less in the disclosed embodiment). The rupturable film 67 is formed when the resin sealing body 65 is manufactured by resin molding.

  However, the material forming the resin sealing body 65 is nylon 66 or nylon 612, and simultaneously forming the rupturable film 67 when forming the resin sealing body 65 on the resin sealing body 65 by injection molding is performed in the molding die. Considering the thickness at which the molten resin can flow, it can be said that it is impossible to form a uniform film thickness. Actually, after the resin sealing body 65 is formed by resin molding, the rupturable film 67 is required to be formed to a required thickness by pressing.

  Therefore, the manufacturing cost for manufacturing the resin sealing body 65 is increased, the management cost for uniformly forming the film thickness of the rupturable film 67 is generated, and the cost of the dry battery that requires a low price because it is disposable. There is a problem that will be up.

  The present invention was devised in view of the above-described problems of the prior art, and the object of the present invention is to provide an explosion-proof structure without increasing the cost of a cylindrical battery having a diameter of 8 ± 0.3 mm. Another object of the present invention is to provide an alkaline primary battery.

  In order to achieve the above object, the present invention accommodates a power generation element in a battery can formed in a bottomed cylindrical shape, and the opening end of the battery can is sealed with a resin sealing body, and the diameter is 8 ± 0.3 mm. The resin sealing body is provided with a through hole into which a cylindrical current collector inserted into the power generation element is inserted into a central portion, and has a diameter of 2.5 to 3. A shaft part formed in a cylinder of .5 mm and a conical shape descending from the upper part of this shaft part at an inclination angle of 120 to 160 degrees, and a thin part having a thickness of 0.15 to 0.25 mm is partly formed. The pressure receiving portion is formed, and a sealing portion that rises in a cylindrical shape with a diameter in contact with the inner diameter of the battery can from the lower end of the pressure receiving portion, and has a planar shape formed in a circular shape.

  According to the above configuration, the diameter of the resin sealing body that seals the opening end of the battery can is small because the diameter of the shaft portion of the resin sealing body is reduced and the pressure receiving portion is provided at a predetermined inclination angle. Therefore, it is possible to solve the problem that a sufficient pressure receiving area for receiving the internal pressure of the battery can cannot be secured. Since the pressure-receiving area can be sufficiently secured, the thin-walled portion formed in the pressure-receiving portion can have a resin-moldable thickness, the resin sealing body can be manufactured by injection molding, and the cost increase of the alkaline primary battery can be suppressed. Can do. By forming the thin wall portion in the pressure receiving portion, when the internal pressure is applied to the pressure receiving portion when the internal pressure of the battery can is abnormally increased, the thin wall portion can be broken and the internal pressure can be released to the outside. Even a small battery of 0.3 mm can have an explosion-proof structure. With the progress of miniaturization and high functionality of portable devices, etc., it was desired to reduce the size of the alkaline primary battery having a battery capacity larger than that of the manganese dry battery, but the alkaline primary battery having a diameter of 8 ± 0.3 mm is small. In addition, an explosion-proof structure can be provided for general use.

  In the above configuration, the inner diameter of the through hole formed in the shaft portion of the resin sealing body is preferably 94 to 97% of the diameter of the current collector. Alkaline electrolyte has high permeability, and if there is a gap between the current collector and the through-hole, leakage occurs due to the phenomenon of the electrolyte creeping up. When inserted, there is no gap between the current collector and the through hole. However, if the inner diameter of the through hole is too small, cracks may occur in the shaft when inserting the current collector, and leakage through the crack will occur, so the inner diameter of the through hole will be the same as the diameter of the current collector. On the other hand, it is desirable to set the ratio.

  In addition, the resin sealing body is formed by injection molding, and it is desirable to provide the gate position at a position not in contact with the alkaline electrolyte, preventing the alkaline electrolyte from penetrating into the resin sealing body from the trace of the gate that tends to remain as an irregular surface. can do.

  Moreover, the material of the resin sealing body is suitable as a resin sealing body by using 6,6-nylon or 6,12-nylon, such as chemical resistance to an alkaline electrolyte, compressibility at the time of sealing, and molding accuracy of a thin portion. It is.

  According to the present invention, since the resin sealing body capable of sufficiently obtaining the pressure receiving area for receiving the battery internal pressure can be formed even in the case of a small alkaline primary battery having a diameter of 8 ± 0.3 mm, the thin-walled portion that breaks due to the abnormal internal pressure It is possible to manufacture an alkaline primary battery that can be provided for general demand by providing an explosion-proof structure provided with

  This embodiment shows an example in which the configuration of the present invention is applied to an alkaline dry battery which is a representative example of an alkaline primary battery, but the electrolytic manganese dioxide which is a positive electrode active substance of the alkaline dry battery is replaced with nickel oxyhydroxide. The same effect can be obtained even when applied to an alkaline primary battery called a nickel battery or an oxyride battery.

  In addition, the cylindrical alkaline battery having a diameter of 8 ± 0.3 mm shown in the present embodiment is not currently manufactured as a single product in Japan and constitutes a 9V prismatic alkaline battery (6LR61) as described above. (In recent years, it has been standardized as LR8D425 by IEC and JIS. Therefore, since it is not standardized as a single battery, the JIS designation is not present, but it is a conventional JIS and a general designation. Since there is no designation of 1 (UM-1) to 5 (UM-5), the designation LR8D425 size displayed as the IEC standard is adopted here.

  FIG. 1 shows a configuration of an alkaline dry battery 1 according to an embodiment. A power generation element is accommodated in a battery can 5 formed in a bottomed cylindrical shape, and an open end of the battery can 5 is sealed by a resin sealing body 2. The alkaline dry battery 1 has a negative electrode terminal cap 4 connected to a current collector 3 penetrating the resin sealing body 2 as a negative electrode terminal and a positive electrode protrusion 6 provided at the bottom of the battery can 5 as a positive electrode terminal.

  The battery can 5 is formed by pressing a steel plate, and a positive electrode mixture 11 in which a positive electrode active material mainly composed of manganese dioxide and graphite is formed into a cylindrical shape is inserted into the battery can 5. A gelled negative electrode material 12 obtained by adding a gelling agent to an alkaline electrolyte (potassium hydroxide aqueous solution) and zinc alloy powder and mixing them through a separator 13 is filled inside. On the opening end side of the battery can 5, a step portion 5 a that is narrowed inward on the circumference is formed. On the step portion 5 a, the current collector 3 is fitted into the resin sealing body 2, and the top of the current collector 3 is placed. A sealing member to which the negative electrode terminal cap 4 is connected is disposed, and the battery can 5 is sealed by caulking that folds the opening end of the battery can 5 inward and compresses the sealing portion 2 c of the resin sealing body 2.

  The resin sealing body 2 is formed into a shape as shown in FIG. 2 by injection molding using 6,6-nylon or 6,12-nylon. A through hole 2d into which the current collector 3 is inserted is provided at the center position, and the shaft portion 2a is formed in a cylindrical shape. The pressure receiving portion 2b is formed by being inclined downward at an inclination angle θ = 125 to 160 degrees from above. A sealing portion 2c is formed from the pressure receiving portion 2b so as to rise upward in a cylindrical shape by providing a step 2e.

  An inner diameter d2 of the through hole 2d provided in the shaft portion 2a is formed to be 94 to 97% of the diameter of the current collector 3 inserted therein. That is, since the current collector 3 is inserted into a hole smaller than its diameter, a state in which the inner peripheral surface of the through hole 2d is in close contact with the outer peripheral surface of the current collector 3 is obtained. The alkaline electrolyte has a high permeability, and if there is a slight gap between the current collector 3 and the through hole 2d, the alkaline electrolyte passes along the peripheral surface of the current collector 3 inserted into the gelled negative electrode material 12. Although a creeping phenomenon that leaks to the outside may occur, liquid leakage is surely prevented by setting the inner diameter d2 of the through hole 2d to the above dimensions. If the inner diameter d2 of the through hole 2d is further reduced, the adhesion to the current collector 3 is further increased. However, when the current collector 3 is fitted and inserted, an excessively widening stress is easily applied to the shaft portion 2a. Stress cracks occur and leakage through the cracks occurs.

  Further, the diameter d1 of the shaft portion 2a is formed to be 2.5 to 3.5 mm when the diameter of the alkaline battery 1 is 8 ± 0.3 mm. By forming the diameter d1 of the shaft portion 2a smaller, the area of the pressure receiving portion 2b, that is, the pressure receiving area for receiving the internal pressure in the battery can 5 can be secured within a limited small diameter of the alkaline dry battery 1. Can do. The diameter d1 of the shaft portion 2a can be made smaller by forming the current collector 3 smaller in diameter, but it becomes difficult to process the current collector 3 and assemble it into a sealing member, and the yield of manufacturing the alkaline dry battery 1 is thus reduced. Reduce. Further, if the diameter d1 of the shaft portion 2a is made small, the strength decreases, and stress cracks are likely to occur when the current collector 3 is inserted.

  Since the pressure receiving portion 2b is formed in a conical shape inclined downward at an inclination angle θ = 125 to 160 degrees from above the shaft portion 2a as shown in the drawing, the pressure receiving area for receiving the pressure in the battery can 5 is larger. By forming a thin portion 2f having a thickness of 0.15 to 0.25 mm at least at a part thereof, when the pressure in the battery can 5 rises abnormally, the thin portion 2f breaks and the internal pressure is reduced. Since the battery can 5 is discharged to the outside, the battery can 5 can be prevented from bursting due to abnormal internal pressure. Since the pressure-receiving area of the pressure-receiving portion 2b can be secured large, the thickness of the thin-walled portion 2f can be set to a thickness that can be injection-molded, and the manufacturing of the resin sealing body 2 can be simplified and the cost can be reduced. it can.

  The sealing portion 2c rising upward from the lower end of the pressure receiving portion 2b is provided with a step 2e so that the sealing member can be stably disposed on the step portion 5a where the battery can 5 is formed. Further, an upper step 2g is formed inside the step 2e. As shown in FIG. 1, the peripheral portion of the negative terminal cap 4 is placed, and the peripheral portion is pressed against the upper step 2g by pressurization when crimped. The sealing performance is enhanced. The sealing portion 2c is compressed by caulking that bends the opening end of the battery can 5 inward, and is in close contact with the outer peripheral surface of the negative terminal cap 4, as shown in FIG. 1, so that the opening end of the battery can 5 is securely sealed. The

  The resin sealing body 2 having the above-described configuration is formed by injection molding as described above, and the gate position at that time is preferably set at a site that does not contact the alkaline electrolyte. The gate is cut at the time of mold release, but the cut trace is likely to remain and the surface is likely to be uneven. Therefore, when the alkaline electrolyte is in contact with the gate trace, the alkaline electrolyte having a large penetrating power penetrates into the resin sealing body 2. Thus, there is a risk of causing cracks and alterations in the resin sealing body 2 due to hydrolysis. Therefore, by providing the gate position on the outer surface side that does not come into contact with the alkaline electrolyte, it is possible to prevent the sealing performance from being lowered by the resin sealing body 2 and configure the alkaline battery 1 without leakage.

  The peripheral surface of the alkaline dry battery 1 assembled as shown in FIG. 1 using the resin sealing body 2 having the above-described configuration is covered with a resin film with the negative electrode terminal cap 4 and the positive electrode protrusion 6 exposed to the outside, and its diameter is The LR8D425 size alkaline dry battery 1 of 8 ± 0.3 mm is completed.

  Since the alkaline dry battery 1 can take out a large discharge current, when an external short circuit or the like occurs, a large short circuit current flows and the battery temperature rises, and the internal pressure in the battery can 5 rises due to the generation of gas, resulting in a battery burst. There is a fear. In the alkaline battery 1 according to the present embodiment, the abnormal increase in internal pressure is received by the pressure receiving portion 2b provided in the resin sealing body 2, and when the internal pressure exceeds the pressure resistance strength of the thin portion 2f formed thereon, the thin portion 2f. Ruptures and releases gas, and is discharged to the outside through the exhaust hole 9 formed in the negative electrode terminal cap 4, so that the abnormally increased internal pressure is calmed and prevented from rupturing the battery. That is, the pressure-receiving part 2b and the thin part 2f provided in the resin sealing body 2 can provide an explosion-proof structure even for the LR8D425-sized alkaline dry battery 1 with a small diameter.

  The alkaline battery 1 is compatible with the conventionally widely used manganese battery, has a larger battery capacity than the manganese battery, and can extract a large discharge current, so it can be applied to a wider range of battery power supply devices. However, since an alkaline electrolyte that adversely affects equipment and the human body is used, measures against leakage are an important component. External short-circuit due to equipment failure, contact with metal objects in pockets or handbags, intentional short-circuit, etc., reverse loading when one or more alkaline batteries 1 are loaded in reverse Explosion-proof so that battery rupture or leakage does not occur even if the user misuses it, such as dry battery charging that charges even though it is a primary battery, high temperature environment where the device or battery is exposed to high temperature Structure and leakage prevention structure are essential. In the alkaline primary battery having a diameter larger than the alkaline dry battery 1 having a diameter size which is the subject of the present invention, the explosion-proof structure and the leakage preventing structure are provided. However, the LR8D425-sized alkali having a very small diameter shown in the present embodiment is provided. Verification was made as to whether the explosion-proof structure and the liquid leakage prevention structure provided in the dry battery 1 function normally.

  As an evaluation method of the explosion-proof structure, one of the four alkaline dry batteries 1 is connected in series with the positive electrode and the negative electrode in the reverse direction and connected in series, and the alkaline dry battery 1 connected in the reverse direction is forcibly The battery was charged, and when the pressure in the battery can 5 increased abnormally due to the generation of gas, it was verified at each temperature condition whether the explosion-proof structure and the liquid leakage prevention structure would operate normally. In addition, when the internal pressure in the battery can 5 abnormally increases, the pressure receiving portion 2b provided in the resin sealing body 2 receives the internal pressure, and the thin portion 2f formed thereon breaks to release the internal pressure to the outside. The optimum numerical value of each part constituting the liquid leakage prevention structure that prevents the occurrence of liquid leakage due to the internal pressure change and temperature change was verified. In addition, the heat cycle which implements liquid leakage test evaluation left the alkaline dry battery 1 in the atmosphere changed in temperature from 0 degreeC to 120 degreeC in the 12-hour cycle, and implemented leakage resistance performance evaluation.

  As shown in Table 1, the alkaline dry battery 1 was produced with the resin sealing body 2 in which the thickness of the thin part 2f and the diameter of the shaft part 2a were changed, and the short circuit test and the heat cycle test were performed for each to cause rupture and leakage. The occurrence of this was verified. As can be seen from the verification results shown in Table 1, when the inclination angle of the pressure receiving portion 2b is 140 degrees, the thickness of the thin portion 2f is 0.15 to 0.25 mm, and the diameter of the shaft portion 2a is 2.5 to 2.5. 3.5 mm has been shown to be optimal.

また、受圧部２ｂの傾斜角度の最適値を検証するために、表２に示すように、受圧部２ｂの傾斜角度を変化させた樹脂封口体２を用いてアルカリ乾電池１を作製し、短絡試験を実施した。表２からもわかるように、軸部２ａの直径を３．０ｍｍ、薄肉部２ｆの厚さを０．２３ｍｍとしたとき、受圧部２ｂの傾斜角度は１２５〜１６０度が最適であることが示されている。

Further, in order to verify the optimum value of the inclination angle of the pressure receiving portion 2b, as shown in Table 2, the alkaline dry battery 1 was produced using the resin sealing body 2 in which the inclination angle of the pressure receiving portion 2b was changed, and a short circuit test was performed. Carried out. As can be seen from Table 2, when the shaft portion 2a has a diameter of 3.0 mm and the thin portion 2f has a thickness of 0.23 mm, the inclination angle of the pressure receiving portion 2b is optimally 125 to 160 degrees. Has been.

以上説明した実施形態では、アルカリ一次電池としてアルカリ乾電池の場合について説明したが、前述したようにアルカリ乾電池の正極作用物質である電解二酸化マンガンをオキシ水酸化ニッケルに置き換えると、デジタルカメラのように比較的大きな放電電流を要求する機器に対応させるのに適したアルカリ一次電池に構成することができる。このオキシ水酸化ニッケルを正極作用物質として採用したアルカリ一次電池は、ニッケル乾電池あるいはオキシライド乾電池の名称で単３（ＵＭ−３）サイズのものが市販されているが、ＪＩＳなどに未だ規格化されていない。本実施形態に示した構成は、このオキシ水酸化ニッケルを採用したアルカリ一次電池をＬＲ８Ｄ４２５サイズの乾電池に構成する場合においても同様に適用することができる。

In the embodiment described above, the case of an alkaline battery as an alkaline primary battery has been described. However, as described above, when electrolytic manganese dioxide, which is a positive electrode active substance of an alkaline battery, is replaced with nickel oxyhydroxide, a comparison is made like a digital camera. It is possible to configure an alkaline primary battery suitable for adapting to a device that requires a large discharge current. Alkaline primary batteries employing nickel oxyhydroxide as the positive electrode active substance are commercially available as AA (UM-3) size under the name of nickel or oxyride batteries, but are still standardized by JIS and others. Absent. The configuration shown in the present embodiment can be similarly applied to the case where the alkaline primary battery employing this nickel oxyhydroxide is configured as an LR8D425 size dry battery.

  As described above, according to the present invention, even an extremely small alkaline primary battery having a diameter of 8 ± 0.3 mm can be provided with an explosion-proof structure with stable performance without causing an increase in cost. Therefore, it is possible to provide a small-sized and high-capacity alkaline primary battery that meets the demand for downsizing and high-functionality of a device such as a portable device that uses a battery as a power source.

FIG. 3 is a cross-sectional view of a main part showing the configuration of the alkaline dry battery according to the embodiment. Sectional drawing which shows the structure of the resin sealing body applied to the dry battery same as the above. Sectional drawing which shows the principal part which shows the structure of the alkaline dry battery which concerns on a prior art. Sectional drawing which shows the principal part which shows the structure of the alkaline dry battery which concerns on a prior art.

Explanation of symbols

1 Alkaline battery (Alkaline primary battery)
2 resin sealing body 2a shaft portion 2b pressure receiving portion 2c sealing portion 2d through hole 2f thin wall portion 3 current collector 4 negative electrode terminal cap 5 battery can

Claims (4)

An alkaline primary battery in which a power generation element is accommodated in a battery can formed in a bottomed cylindrical shape, and the opening end of the battery can is sealed with a resin sealing body, and the diameter is 8 ± 0.3 mm. And
The resin sealing body has a shaft portion formed in a cylinder having a diameter of 2.5 to 3.5 mm by providing a through hole into which a cylindrical current collector inserted into the power generation element is inserted in the center portion, A pressure receiving portion in which a cone portion is lowered from above the shaft portion at an inclination angle of 120 to 160 degrees, and a thin portion having a thickness of 0.15 to 0.25 mm is formed in a part thereof; And a sealing portion that rises in a cylindrical shape with a diameter in contact with the inner diameter of the battery can, and the planar shape is formed in a circular shape. The alkaline primary battery according to claim 1, wherein an inner diameter of the through hole formed in the shaft portion of the resin sealing body is 94 to 97% of a diameter of the current collector. The alkaline primary battery according to claim 1 or 2, wherein the resin sealing body is formed by resin molding, and the gate position thereof is provided at a position not in contact with the alkaline electrolyte. The alkaline primary battery according to any one of claims 1 to 3, wherein a material of the resin sealing body is 6,6-nylon or 6,12-nylon.

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