WO2008066056A1

WO2008066056A1 - Manganese dry cell

Info

Publication number: WO2008066056A1
Application number: PCT/JP2007/072895
Authority: WO
Inventors: Tsutomu Ishida; Yasutaka Hara; Yasuo Mukai
Original assignee: Panasonic Corporation
Priority date: 2006-11-29
Filing date: 2007-11-28
Publication date: 2008-06-05
Also published as: JP2008135327A

Abstract

A manganese dry cell (1) in which a positive electrode cap (4) is caulked to an opening (3) of a negative electrode zinc can (2) through an insulating gasket (5). The insulating gasket (5) has a cross section having a generally flat plate shape when viewed from above, a collector insertion hole (5a) through which a collector (6) is inserted and which is formed at the central part of the insulating gasket (5), a peripheral part (5b) curved upward in contact with the negative zinc can (2)and caulked to the edge (2a) of the opening of the negative zinc can (2) together with the positive cap (4). At least one projecting part (7) for partially enhancing the deformation strength of the region of the insulating gasket (5) around the projecting part (7) is formed on the surface between the contact part (5c) of the insulating gasket (5) in contact with the negative zinc can (2) and the collector insertion hole (5a). With this, the safety mechanism for preventing rupture provided to the sealing structure of the manganese dry cell (1) is simple, and it is prevented that the operation pressure becomes unstable because of the manufacturing variation of the safety mechanism or the degradation of the material in the environment where the manganese dry cell (1) is in use. Thus, a manganese dry cell having a safety mechanism reliably and stably operating is provided.

Description

Specification

Manganese battery

Technical field

[0001] The present invention relates to a manganese dry battery, and more particularly to a sealing structure thereof.

Background art

[0002] In cylindrical manganese dry batteries that do not use an outer can, the sealing body is sealed by tightening the sealing body with a negative electrode zinc can that also serves as a case, and the sealing structure provided with such a sealing body prevents rupture. Without the mechanism, if the battery is accidentally charged and hydrogen gas is generated inside the battery, the pressure inside the battery suddenly rises and the internal pressure of the battery becomes higher than the sealing pressure of the battery. In some cases, the sealing portion of the battery may be loosened, resulting in rupture. Therefore, as a countermeasure against this, the sealing structure of cylindrical manganese dry batteries that do not use an outer can is provided with safety measures to prevent bursting.

For example, in the cylindrical battery described in Patent Document 1 below, as shown in FIG. 5, a gasket in which an inner cylinder portion 11 and an outer cylinder portion 12 are connected by a connecting portion 13 and integrally formed as shown in FIG. 10 (sealing body) is used to form a vertically extending groove 14 on the inner peripheral surface 11a of the inner cylinder part 11, and a thin valve part 15 that is vertically divided in the middle of the groove 14 to provide an inner cylinder part. A carbon current collector rod was passed through 11 to bring the thin valve portion 15 into close contact with the carbon current collector rod, and a sealant previously applied to the outer peripheral surface of the current collector rod was interposed at the joint between the inner cylinder portion 11 and the current collector rod. The sealing structure is disclosed. In the cylindrical battery configured in this way, the sealing agent securely adheres to the thin valve portion 15 and the current collecting rod, and air is not confined between the thin valve portion 15, the current collecting rod and the sealing agent. It is possible to prevent the sealing agent from being perforated by air expansion and contraction, and to improve the airtightness and reliability of the sealing structure.

[0004] Also, in the alkaline battery technology described in Patent Document 2 below, as shown in FIG. 6, an insulating circuit is provided in an end cap assembly 20 for sealing an opening of a bottomed cylindrical container. A disc 21 (sealing body) is incorporated, and a rupturable membrane 22 is formed in a part of the disc 21 (in the middle portion of the insulating seal disc). The rupturable membrane 22 has a predetermined gas pressure inside the battery. It is configured to rupture when the level is reached. And this The insulating seal disk 21 (ruptureable film 22) is made of polyamide resin (nylon).

Patent Document 1: Utility Model Registration No. 2600931

Patent Document 2: Japanese Translation of Special Publication 2002-516462

Disclosure of the invention

Problems to be solved by the invention

[0005] In the cylindrical battery disclosed in Patent Document 1, the safety mechanism including the thin valve portion 15 is used as a sealing body.

(Gasket 10) The strength of the carbon rod insertion part (inner cylinder part 1 1) of the gasket 10 is generally used in mangan dry batteries with a small thin valve part! When the body (thin valve part) is formed, it deteriorates particularly in a high temperature environment and immediately has low sealing performance and low reliability for prevention of bursting.

[0006] In addition, the battery described in Patent Document 2 is an alkaline battery. Therefore, the force in which polyamide resin is used for the above-described insulating seal disk 21 (ruptureable film 22). When formed using polyethylene resin, etc., polyethylene resin has a narrower operating temperature range than polyamide resin, and is particularly susceptible to deterioration in high-temperature environments, so that the ruptureable membrane extends and the rupture prevention mechanism does not operate normally. There is a problem.

[0007] That is, the conventional thin-walled valve (or membrane) structure formed using polyethylene resin or the like is deteriorated particularly at high temperatures (45 to 60 ° C) and immediately has low reliability for sealing performance. It was. In addition, the thin valve structure is a structure that prevents the battery from rupturing when the thin part deforms and breaks, but the variation in the thickness of the thin part affects the operating pressure to prevent rupture, so the battery The reliability for preventing the bursting of the steel was not sufficient.

[0008] The present invention operates with a simple structure of a safety mechanism for preventing rupture provided in a sealing structure, due to manufacturing variations of the safety mechanism, or due to material deterioration in a use environment. An object of the present invention is to provide a manganese dry battery having a safety mechanism that operates reliably and stably by preventing the pressure from becoming unstable.

Means for solving the problem

[0009] The manganese dry battery according to the present invention has a positive electrode cap at the opening of the negative electrode zinc can. A manganese dry battery that is caulked and sealed via a sket, and the insulating gasket is formed in a substantially flat plate shape in cross-section, and a current collector through-hole through which the current collector is passed is provided at the center. The peripheral edge of the insulating gasket is bent upward while being in contact with the negative electrode zinc can, and caulked at the open end of the negative electrode zinc can together with the positive electrode cap, and the contact portion of the insulating gasket with the negative electrode zinc can and the current collector through hole At least one projecting portion that partially improves the deformation strength of the insulating gasket at the periphery thereof is formed on the plane between the two.

[0010] According to the manganese dry battery configured as described above, the insulating gasket is deformed around the circumferential region (hereinafter referred to as region A) where the protruding portion is formed in the insulating gasket (sealing body). Since the strength is increased and the deformation is suppressed, when the battery internal pressure rises, the insulation gasket is applied to the battery internal pressure in the circumferential region where the protrusions are not formed (hereinafter referred to as region B). It is deformed so as to be pushed upward by. As a result, in this area B, a gap is created between the inner surface of the insulating gasket facing the current collector through hole and the current collector passed through the current collector through hole. The internal gas is released outside the battery through this gap.

[0011] In addition, since the above-described insulating gasket does not employ a thin-walled valve structure, even when there is some variation in the shape and dimensions of the protrusions during manufacturing, the operating pressure when discharging the gas However, even if it is made of polyethylene resin, it does not cause deterioration of the material in a high-temperature environment. Therefore, the operating pressure does not vary.

[0012] As described above, the manganese dry battery according to the present invention has a simple configuration of the safety mechanism for preventing burst provided in the sealing structure, and the manufacturing environment varies depending on the manufacturing mechanism of the safety mechanism. It has a safety mechanism that operates reliably and stably by preventing the operating pressure from becoming unstable as the material deteriorates below.

[0013] Further, in the above-mentioned manganese dry battery, it is desirable that the lateral force opposed to the current collector of the projecting portion is separated from the current collector!

[0014] According to the manganese dry battery configured in this way, when the internal pressure of the battery rises by separating the side surface of the protruding portion that faces the current collector through-hole from the current collector, In area B When the insulating gasket is deformed, its progress is not hindered by sliding resistance, and the internal gas can be discharged smoothly with a more reliable operating pressure.

[0015] Further, in the above manganese dry battery, it is desirable that the upper surface of the projecting portion is separated from the lower surface of the opposing positive electrode cap with a gap of 0.1 mm to 0.6 mm.

[0016] According to the manganese dry battery configured as described above, the operating pressure (explosion-proof strength) at the time of gas discharge is reduced by appropriately separating the upper surface of the protruding portion from the lower surface of the opposing positive electrode cap. Variations can be prevented from occurring. In other words, if the gap is less than 0.1 mm, the top part (upper surface) of the projecting part is in contact with the lower surface of the positive electrode cap during the assembly process of fitting the insulating gasket into the positive electrode cap while slightly deforming it. There is a possibility that problems such as inability to insert with high precision may occur, and if such a problem occurs, it may cause variations in the operating pressure when the gas is discharged. In addition, if the gap is larger than 0.6 mm, the top of the projecting portion may not contact the lower surface of the positive electrode cap, and the deformation of the insulating gasket in the region A may not be sufficiently suppressed. Even in such a case, the operating pressure varies when the gas is discharged.

[0017] Further, in the above-described manganese dry battery, it is desirable that the upper surface of at least one of the projecting portions is in contact with the lower surface of the facing positive electrode cap.

[0018] According to the manganese dry battery configured in this way, the deformation strength of the insulating gasket around the projecting portion is obtained by bringing the upper surface of at least one projecting portion into contact with the lower surface of the opposing positive electrode cap. When the internal pressure of the battery rises, the deformation is suppressed, and the insulating gasket in the area B that is not dragged by the deformation of the insulating gasket in the area B helps to quickly deform and The gas discharged by the rising can escape along the side surface of the projection, and the gas discharge can proceed smoothly.

[0019] Furthermore, in the above-described manganese dry battery, it is desirable that a sliding contact protrusion is formed on a side surface of the protruding portion facing the current collector, and a top portion of the sliding contact protrusion is in contact with the current collector. .

[0020] According to the manganese dry battery thus configured, the sliding contact protrusion formed on the side surface of the protrusion

1S When the internal pressure of the battery rises, the insulation gasket in region B is dragged and slides along the surface of the current collector, helping to quickly deform the insulation gasket in region B. The gas exhausted by the increase in the battery internal pressure along the side of the protrusion The escape and gas discharge can proceed smoothly.

Brief Description of Drawings

[0021] [Fig. 1] Fig. 1A and Fig. IB are sectional views for explaining the sealing structure of a manganese dry battery according to the present invention. Fig. 1A is a state in which an insulating gasket is in a normal position, Fig. 1B. Shows the state that the protruding part of the insulating gasket is formed! /, And the part is deformed by the increase of the battery internal pressure.

FIG. 2 is a perspective view for explaining the shape of an insulating gasket in which arc-shaped protrusions are formed in a manganese dry battery according to the present invention.

[FIG. 3] FIGS. 3A to 3D are plan views for explaining various forms of protrusions formed on the insulating gasket of the manganese dry battery according to the present invention, and FIG. 3A is formed in a substantially cylindrical shape. Fig. 3B shows a rectangular shape in plan view with a long side in the radial direction centered on the axis of the current collector through hole. Fig. 3C shows the axis of the current collector through hole. Fig. 3D shows a plane with an arc in the circumferential direction centered on the axis of the current collector through-hole, with a long side in the direction perpendicular to the radiation direction centered on It is formed in an approximate band shape.

[FIG. 4] FIGS. 4A to 4E are a plan view (upper view) and a side view for explaining a specific embodiment of the arc-shaped protrusion formed on the insulating gasket of the manganese dry battery according to the present invention. Fig. 4A is a figure with approximately 1/4 arc-shaped projections, Fig. 4B is a figure with one approximately 1/6 arc-shaped projection, Fig. 4C shows a projection with approximately 5/6 arc-shaped projections, and Fig. 4D shows one projection with approximately 1/4 arc-shaped projection and approximately 1/5 arc-shaped projection. As shown in FIG. 4E, two protrusions having a substantially arc shape are formed and arranged adjacent to each other.

FIG. 5 is a cross-sectional view for explaining a sealing structure of a conventional cylindrical battery.

FIG. 6 is a cross-sectional view for explaining a sealing structure of a conventional alkaline battery.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the best mode for carrying out the manganese dry battery of the present invention will be described in detail with reference to FIGS. 1A to 4E. 1A and IB are cross-sectional views for explaining a sealing structure of a manganese dry battery according to the present invention, FIG. 1A is a state in which the insulating gasket is in a normal position, and FIG. 1B is a protruding portion of the insulating gasket. The part where is not formed is due to the increase in battery internal pressure. A deformed state is shown. FIG. 2 is a perspective view for explaining the shape of the insulating gasket formed with the arc-shaped protrusions of the manganese dry battery according to the present invention. 3A to 3D are plan views for explaining various forms of protrusions formed on the insulating gasket of the manganese dry battery according to the present invention. FIGS. 4A to 4E are diagrams illustrating the present invention. It is the top view (upper figure) and the side view (lower figure) for demonstrating the specific aspect about the arc-shaped protrusion part formed in the insulating gasket of the manganese dry battery which concerns. It should be understood that the embodiment disclosed below is illustrative in all respects and not restrictive. The technical scope of the present invention is shown not by the contents disclosed in the embodiments but by the description of the scope of claims, and further, all modifications within the meaning and scope equivalent to the scope of claims are intended. Should be understood to be included.

[0023] As shown in FIG. 1A, a manganese dry battery 1 according to the present invention has an opening of a negative electrode zinc can 2.

3 (open end 2a) is a positive cap 4 that is caulked and sealed through an insulating gasket 5. The insulating gasket 5 is formed of a polyethylene resin having a substantially circular flat plate shape in cross section, and a current collector through hole 5a through which the carbon rod current collector 6 (current collector) is passed is provided at the center. At the same time, the peripheral edge 5 b abuts on the negative electrode zinc can 2 and is bent upward, and is caulked together with the positive electrode cap 4 at the open end 2 a of the negative electrode zinc can 2. Then, the deformation strength of the insulating gasket 5 is measured on the plane between the contact portion 5c of the insulating gasket 5 with the negative electrode zinc can 2 and the current collector through-hole 5a (hereinafter referred to as the annular portion C). A protruding portion 7 is formed which is partially improved at the portion.

As an example of the present embodiment, as shown in FIG. 2, a projecting portion 7 formed in an arc shape has an axial center of the current collector through-hole 5a (the axis of the carbon rod current collector 6). The upper surface 7b at the top of the carbon rod current collector 6 is spaced apart from the carbon rod current collector 6 facing the inner surface 7a. It is formed with a slight gap H (separated) from the lower surface of the positive electrode cap 4 facing it. Then, by forming such a protruding portion 7 in the annular portion C of the insulating gasket 5, the thickness of the insulating gasket in the region A is substantially increased, and the circumference of the insulating gasket 5 around the region A is increased. The rigidity in the direction and the diameter direction can be increased and the deformation strength can be improved.

[0025] The insulating gasket 5 is made of a polyolefin resin such as polyethylene or polypropylene as a material. It is molded using grease, bent upward at the outer peripheral part (contact part 5c) of the insulating gasket 5 that contacts the peripheral side surface of the negative electrode zinc can 2, and its upper end part (peripheral part 5b) is the positive electrode cap 4 and the force caulked at the open end 2a of the negative electrode zinc can 2 Between the contact portion 5c and the current collector through-hole 5a in contact with the carbon rod current collector 6 (excluding the protruding portion 7) Is a disk-shaped flat plate force. The contact portion between the carbon rod current collector 6 passed through the current collector through-hole 5a and the negative electrode zinc can 2 is sealed with a sealing agent 8 made of polybutene as a sealing material. .

[0026] The positive electrode cap 4 is formed using a thin nickel-plated plate. The positive electrode cap 4 is formed in a substantially U-shaped cross-sectional view having a circular flat surface on the upper surface 4a, and further recessed on the upper surface 4a. A portion 4b is formed to open downward, and the upper end portion of the carbon rod current collector 6 passed through the current collector through hole 5a of the insulating gasket 5 is fitted into the recess 4b. And the upper surface of this recessed part 4b is a positive electrode terminal part. Further, the peripheral side portion 4c of the positive electrode cap 4 is bent and extended outward at the lower side, and further bent and extended upward at the outer edge portion. The positive electrode cap 4 formed in this manner is caulked at the open end 2a of the negative electrode zinc can 2 so that the flange portion 4d at the peripheral edge is surrounded by the peripheral edge portion 5b of the insulating gasket 5 bent upward. Sealed! /

[0027] The negative electrode zinc can 2 is a cylindrical container with a bottom. After the positive electrode mixture and the like are sealed, the open end 2a of the positive electrode cap 4 via the insulating gasket 5 is used as described above. It is sealed with staking. The outer surface of the peripheral side portion 2b of the negative electrode zinc can 2 (the range extending to the open end 2a excluding the bottom portion of the negative electrode zinc can 2) is covered with a heat-shrinkable outer tube 9.

In the manganese dry battery 1 configured as described above, when the battery internal pressure increases, as shown in FIG. 1B, the deformation of the insulating gasket 5 around the area A is suppressed, and the insulating gasket 5 in the area B is suppressed. Is preferentially deformed so that the lower part of the current collector through-hole 5a in the region B of the insulating gasket 5 is separated from the sealant 8, and the inner peripheral surface of the current collector through-hole 5a and carbon A gap S is formed between the rod current collector 6 and the outer surface, and the gas inside the battery can be reliably discharged through the gap S. The explosion-proof strength when discharging this gas is set to 1.5 MPa or more and 4.5 MPa or less.

[0029] The wall thickness t at the annular portion C of the insulating gasket 5 is 0.8 m so as to obtain the above explosion-proof strength. m-2. It is set in the range of Omm. When the wall thickness t is less than 0.8 mm, the contact area between the insulating gasket 5 and the carbon rod current collector 6 on the inner peripheral surface of the current collector through-hole 5a is reduced, and the insulating gasket 5 and the carbon rod current collector are reduced. If the sealed state with the electrical conductor 6 cannot be maintained and the wall thickness t exceeds 2. Omm, the insulation gasket 5 in the region B will not be sufficiently deformed when the battery internal pressure rises, and the explosion-proof strength will not increase. Get higher.

[0030] The thickness t at the annular portion C of the insulating gasket 5 is the size of the projecting portion 7 formed on the insulating gasket 5, that is, the circumferential length, the vertical width and the height thereof. Depending on the thickness (protrusion amount) and the number of pieces, the thickness is appropriately set in the above range, and may be set differently in the region A and the region B of the insulating gasket 5. For example, increase the thickness t of the insulation gasket 5 in the region A (thicken the thickness t in the region B) and change the insulation gasket 5 in the region B.

A B

It may be set so that the shape tends to occur, or the thickness t of the insulating gasket 5 in the region A is made thin (region

A

Increase the thickness t of area B), and determine the insulation gas gasket of area A according to the shape, dimensions, and number of protrusions.

B

The deformation strength of the base 5 may be supplemented. In addition, the wall thickness t of the insulation gasket 5 in the region A and the region B

A

, T may be set differently, different thicknesses t, t may be set by providing steps.

B A B

In order to promote gentle deformation in region B, set different slopes t and t by providing inclined parts.

A B

Is desirable.

[0031] The protrusion 7 is formed so as to stand on a plane between the contact portion 5c of the insulating gasket 5 with the negative electrode zinc can 2 and the current collector through hole 5a (annular portion C). It is formed integrally with the insulating gasket 5 and is molded at the same time as the insulating gasket 5 by using the same mold during resin molding. Regarding the shape and dimensions of the projecting portion 7, the deformation of the insulating gasket 5 in the region A is restrained and deformed in the insulating gasket 5 in the region B corresponding to the various forms to be applied. What is necessary is just to set suitably so that internal gas may be discharged | emitted. Further, the number of the protruding portions 7 may be set as appropriate from the same viewpoint.

[0032] The shape of the projecting portion 7 is formed in a substantially cylindrical shape shown in FIG. 3A (7A), and in a radiation direction centered on the axis of the current collector through-hole shown in FIG. 3B. Formed in a substantially rectangular shape in plan view with a long side (7B), in plan view with a long side in a direction perpendicular to the radiation direction centering on the axis of the current collector through-hole shown in FIG. 3C Although formed in a rectangular shape (7C), it has an arc in the circumferential direction centering on the axis of the current collector through hole shown in Fig. 3D. (7D) formed in a substantially band shape in plan view. Hereinafter, these embodiments will be specifically described. In FIGS. 3A to 3D, the protruding portions 7 indicated by broken lines indicate the protruding portions 7A to 7D when a plurality of protruding portions 7 are formed.

[0033] First, the protruding portion 7A formed in a substantially cylindrical shape shown in FIG. 3A has a horizontal cross-section formed of a circle or an ellipse, and the top of the protrusion 7A is a flat surface or a curved surface convex upward. It has been done. By forming one such protruding portion 7A on the plane between the contact portion 5c of the insulating gasket 5 with the negative electrode zinc can 2 and the current collector through hole 5a, the protruding portion 7A is formed. The deformation strength can be partially improved at the periphery of the insulating gasket 5 formed. Further, by arranging a plurality of such protruding portions 7A, preferably on a substantially circumferential line centering on the axis of the current collector through hole 5a, a plurality of protruding portions 7A are formed. In addition, the deformation strength of the insulating gasket 5 can be improved over the entire region.

[0034] Next, a protruding portion 7B formed in a substantially rectangular shape in plan view having a long side in the radiation direction centered on the axial center of the current collector through-hole shown in FIG. 3B, and FIG. 3C The protrusion 7C formed in a substantially rectangular shape in plan view having a long side in a direction perpendicular to the radiation direction centering on the axis of the current collector through-hole shown in FIG. It is configured as a substantially rectangular shape having long sides in the vertical direction or the horizontal direction, and its top is formed by a curved surface having a convex shape on a plane or upward. By forming one such protruding portion 7A, 7B on the plane between the contact portion 5c of the insulating gasket 5 with the negative electrode zinc can 2 and the current collector through hole 5a, the protruding portion 7A, In the peripheral part of the insulating gasket 5 on which 7B is formed, in the case of the projecting part 7B, the deformation strength in the radial direction is particularly obtained. It can be partially improved. Further, by arranging a plurality of such protruding portions 7B and 7C, preferably on a substantially circumferential line centering on the axial center of the current collector through hole 5a, a plurality of protruding portions 7B are provided. The deformation strength of the insulating gasket 5 on which 7C is formed can be improved over the entire region.

[0035] In addition, the protrusion 7D formed in a substantially band shape in plan view having an arc in the circumferential direction around the axis center of the current collector through-hole shown in FIG. 3D has a vertical cross-section. It is configured as a substantially square or a substantially rectangular shape having a long side in the vertical direction or the horizontal direction, and its top is formed by a curved surface that is a flat surface or a convex shape upward. Such a protrusion 7D is insulated with insulating gas. By forming one piece on the plane between the contact portion 5c of the gasket 5 with the negative electrode zinc can 2 and the current collector through-hole 5a, the peripheral portion of the insulating gasket 5 where the projecting portion 7D is formed is formed. Particularly, the deformation strength in the circumferential direction can be partially improved. Further, by arranging a plurality of such protruding portions 7D, preferably on a substantially circumferential line centering on the axis of the current collector through hole 5a, a plurality of protruding portions 7D are formed. In addition, the deformation strength of the insulating gasket 5 can be improved over the entire region.

[0036] Further, when one such protruding portion 7 is formed in the annular portion C of the insulating gasket 5, the deformation of the insulating gasket 5 around the region A is suppressed, and the insulating gasket 5 in the region B is given priority. In order to be deformed properly, as shown in Fig. 4A and Fig. 4B, it is desirable that it is formed in the range of 1/6 arc or more of the circumference, and as shown in Fig. 4C, Protruding part 7 is provided! /, Na! /, Part (area should occupy more than 1/6 arc of its circumference! /, It is desirable! / When the cylindrical portion 7 is formed on substantially the same circumferential line centering on the axial center of the current collector through hole 5a of the annular portion C of the insulating gasket 5, as shown in FIG. The portions 7 may be arranged adjacent to each other, or may be arranged apart from each other as shown in Fig. 4E. It is desirable that the protrusions 7 that are in contact with each other be separated from each other by 1/6 arc or more of the circumference of the protrusion 7D. The same applies to the other protrusions 7A to 7C, but if a plurality of protrusions 7 are arranged adjacent to each other or separated from each other, they are provided in the same region as a whole. The effect of suppressing deformation strength equivalent to the case where the long protrusions 7 are formed is obtained, and the amount of the resin material used for forming the insulating gasket 5 can be reduced, which is desirable.

[0037] Although the inner surface 7a of the protrusion 7 facing the carbon rod current collector 6 may be in contact with the carbon rod current collector 6, a gap G is formed between the carbon rod current collector 6 and the inner surface 7a. It is desirable that they are spaced apart. This gap G may be set to an arbitrary dimension. When the inner surface 7a of the protrusion 7 is in contact with the carbon rod current collector 6, when the battery internal pressure rises and the insulating gasket 5 in region B is deformed, the deformation proceeds smoothly due to sliding resistance. In such a case, the gas discharge operation may be delayed or the operating pressure (explosion-proof strength) may vary. Therefore, the inner surface 7a of the protrusion 7 is separated from the carbon rod current collector 6. As a result, when the internal pressure of the battery rises, the force S is used to smoothly discharge the internal gas at a more reliable operating pressure.

[0038] In addition, the protruding portion formed in a substantially rectangular shape in plan view having a long side in the radial direction or the vertical direction centering on the axial center of the current collector through-hole shown in FIGS. 3A and 3B. 7B, or 7C, or the projecting portion 7D formed in a substantially band shape in plan view having an arc in the circumferential direction shown in FIG. 3D, the inner surface 7a of the projecting portion 7 is contacted with the carbon rod current collector 6. If not, a sliding contact projection 7c (see FIGS. 2 and 4A) is provided on the inner surface 7a of the projection 7 and the top of the sliding projection 7c contacts the carbon rod current collector 6. It is desirable. The sliding contact projection 7c has a curved top at the top that makes contact with the carbon rod current collector 6, which is desired to be provided near the end of the projection 7 in the circumferential direction. It is desirable to make point contact with 6. When such a sliding contact protrusion 7c is provided on the inner surface 7a of the protrusion 7, the end force S of the region A, which has a high deformation strength, and the insulating gasket 5 of the region B are deformed. By sliding along the surface of the carbon rod current collector 6, the insulating gasket 5 in the region B can be quickly deformed, and the flow of gas inside the battery discharged due to the increase in battery internal pressure The road S is also extended to the inner side surface 7a of the projecting portion 7 so that the gas can escape along the inner side surface 7a and smoothly discharge the gas.

[0039] In the case of the protruding portion 7A formed in a substantially cylindrical shape shown in Fig. 3A, the circumferential surface may be in contact with the outer peripheral surface of the carbon rod current collector. The sliding contact protrusion may not be provided on the circumferential surface. Even if the protruding portion 7A is in contact with the carbon rod current collector 6, the side surface facing the carbon rod current collector 6 is formed in an arc shape, and is in contact with the carbon rod current collector 6 by line contact. Therefore, when the internal pressure of the battery rises and the insulating gasket 5 in the region B is deformed, the progress of the deformation is not hindered by the sliding resistance. In addition, the gas S discharged by the rise of the internal pressure of the battery escapes along the arc-shaped side surface, and the gas S can be smoothly advanced by the force S.

[0040] Further, in the case of the protruding portion 7 (7B to 7D) formed in a substantially rectangular shape or an arc shape in plan view shown in FIGS. 3B to 3D, the protruding portion 7 It is desirable that the top portion (upper surface 7b) is separated from the lower surface of the positive electrode cap 4 which is opposed through a gap H of 0.1 mm to 0.6 mm. A more preferable gap H is 0.2 to 0.5 mm, and dimensional variation during manufacturing is considered. Considering this, it is better to set the height (projection amount) of the protrusion 7 so that a gap H of about 0.3 mm is formed. When the gap H is less than 0.1 mm and is small, the top part (upper surface 7b) of the projecting portion 7 is in contact with the lower surface of the positive electrode cap 4 in the assembly process in which the insulating gasket 5 is slightly deformed and fitted into the positive electrode cap 4. There is a possibility that problems such as inability to insert with high accuracy may occur. If such a problem occurs, it may cause fluctuations in the operating pressure (explosion proof strength) when the gas is discharged. Further, when the battery internal pressure rises, the deformation of the insulating gasket 5 in the region B can be suppressed without necessarily contacting the upper surface 7b of the projecting portion 7 with the lower surface of the opposing positive electrode cap 4, but If the height of the protrusion 7 is set so that the upper surface 7b of the protrusion 7 contacts the lower surface of the positive electrode cap 4, the deformation of the insulating gasket 5 in the region B can be more reliably prevented. If the gap H is larger than 0.6 mm, when the battery internal pressure rises, the top of the protrusion 7 does not come into contact with the lower surface of the positive electrode cap 4, and the insulation gasket 5 is sufficiently deformed in the area A. It is also possible that it will not be suppressed. Even in such a case, the operating pressure varies when the gas is discharged.

[0041] Note that the protrusion 7 (7A) formed in the substantially cylindrical shape shown in FIG. 3A and the protrusion 7 (7B-7D) shown in FIGS. 3B to 3D above. Even when the cross-sectional area S in plan view is small, the top portion (upper surface 7b) of the projecting portion 7 may be in contact with the lower surface of the positive electrode cap 4 facing the same. When a plurality of such substantially cylindrical protrusions 7 are arranged side by side, the upper surface 7b of one or more protrusions 7 is in contact with the lower surface of the positive electrode cap 4 instead. It is desirable. This is because when the internal pressure of the battery rises, the top of the projecting portion 7 comes into contact with the lower surface of the positive cap 4 and the deformation of the insulating gasket 5 around the region A is reliably suppressed, and the insulating gasket in the region B is deformed. This is because the gas inside the battery is surely discharged to prevent explosion. In particular, when a plurality of protrusions 7 are arranged side by side, if any protrusion 7 is not in contact with the lower surface of the positive electrode cap 4 due to manufacturing variations, it cannot cope with a sudden rise in battery internal pressure. There is also a concern that any of the projecting portions 7 is in contact with the lower surface of the positive electrode cap 4, so that the reliability of the operation during gas discharge can be improved.

Industrial applicability

[0042] As described above, according to the present invention, the safety mechanism for preventing rupture provided in the sealing structure has a simple configuration, and it is caused by manufacturing variations of the safety mechanism or used. It is possible to provide a manganese dry battery having a safety mechanism that operates reliably and stably by preventing the operating pressure from becoming unstable as the material deteriorates in a service environment. Therefore, the sealing structure provided with the safety mechanism disclosed in the present invention can be suitably used for a cylindrical steel manganese battery that does not use an outer can, thereby improving the safety of the manganese battery for a long time. Can be ensured over the whole area and its reliability can be improved.

Claims

The scope of the claims

1. A manganese dry battery (1) in which a positive electrode cap (4) is caulked and sealed with an insulating gasket (5) in an opening (3) of a negative electrode zinc can (2),

The insulating gasket (5) is formed in a substantially flat plate shape in cross section, and is provided with a current collector through hole (5a) through which a current collector (6) is passed, and a peripheral portion thereof. (5b) abuts on the negative electrode zinc can (2) and is bent upward, and is caulked together with the positive electrode cap (4) at the open end (2a) of the negative electrode zinc can (2);

On the plane between the contact portion (5c) of the insulating gasket (5) with the negative electrode zinc can (2) and the current collector through hole (5a), the deformation strength of the insulating gasket (5) is reduced. A manganese dry battery characterized in that at least one protruding portion (7) that is partially improved in the peripheral portion is formed.

2. The side surface (7a) of the projecting portion (7) facing the current collector (6) is spaced apart from the current collector (6). Manganese dry battery.

3. The upper surface (7b) of the protruding portion (7) is separated from the lower surface of the opposing positive electrode cap (4) by a gap of 0.1 mm to 0.6 mm. A manganese dry battery as described in item 2 or 2.

4. The upper surface (7b) of at least one of the protrusions (7) is in contact with the lower surface of the opposing positive electrode cap (4). The manganese dry battery described.

5. A sliding contact protrusion (7c) is formed on a side surface of the protruding portion (7) facing the current collector (6), and a top portion of the sliding contact protrusion (7c) is formed on the current collector (6 The manganese dry battery according to any one of claims 1 to 4, which is in contact with (1).