JP2006202637A - Alkaline battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alkaline battery surely operating an explosion-proof function when internal pressure increases even if the operation space for the explosion-proof function is narrow. <P>SOLUTION: The alkaline battery is equipped with a container 1 also acting as one electrode terminal of a positive terminal and a negative terminal, a positive electrode and a negative electrode housed in the container 1, an other electrode terminal plate 7 crimped to an opening part of the container through a sealing gasket 8, and an other current collector 17 electrically connected to the other electrode terminal plate 7, the sealing gasket 8 is equipped with a boss part 9 for inserting the other electrode current collector 17, a cylindrical outer wall part 10 arranged between the opening part of the container 1 and the other electrode terminal plate 7, and a frame part 11 connecting the boss part 9 with the cylindrical outer wall part 10, the frame part 11 has a ring-shaped valve membrane 12 and a bent part 14 bent from the periphery of the valve membrane 12 to the other electrode terminal plate side, and the bent part 14 has a side part on the valve membrane side longer and thicker than the side part of the opposite side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an alkaline battery such as a cylindrical alkaline battery.

  The sealing gasket in which the thin film portion is formed on the outer peripheral edge of the boss portion of the conventional alkaline battery has a boss-shaped center line connecting the thin film portion formed on the outer peripheral periphery of the boss portion and the cylindrical outer wall portion. On the other hand, it was inclined in a direction away from the negative electrode terminal as approaching the vertical or outer periphery. This tilt is convenient and used by many battery manufacturers to support the separator opening to prevent solids in the separator from spilling out of the separator.

  When the battery is charged due to reverse loading, etc., and the internal pressure of the battery rises, the thin film part and the flange connected to it deform, and when the specified pressure is exceeded, the thin film part breaks and efficiently releases the internal gas. By doing so, the explosion-proof function is developed.

  Alkaline batteries, on the other hand, have been increasing the number of portable devices in recent years, and there is a strong demand for longer life. Therefore, optimization of contents and examination of various additives have been conducted, but the battery structure has been improved. There are also studies to increase the internal volume itself.

  The functions required for the sealing gasket of an alkaline battery with an explosion-proof function are to seal the inside of the battery and to have an explosion-proof function that operates reliably when the internal pressure of the battery exceeds a predetermined pressure. In order to increase the internal volume, a more space-saving structure is required.

  As an example of an alkaline battery that saves space, has a sealing property, and has an explosion-proof function, for example, an alkaline battery described in Patent Document 1 can be cited. In the explosion-proof function of the alkaline battery described in Patent Document 1, a thin safety valve 62 is formed around the boss portion 6, and a disk-like connection portion 63 is formed around the safety valve 62. A plurality of ribs 64 are provided on the terminal side surface.

However, in the explosion-proof function described in Patent Document 1, since the safety valve 62 is broken when the entire connecting portion 63 is bent by the gas pressure, it is necessary to take a large space necessary for the deformation of the connecting portion 63, thereby saving space. Is disadvantageous. Further, if the distance between the negative electrode terminal 3 and the sealing gasket is reduced in order to save space, the bent connecting portion 63 comes into contact with the negative electrode terminal 3 before the safety valve 62 breaks, and the safety valve 62 does not operate reliably. .
JP 2003-217532 A

  An object of the present invention is to provide an alkaline battery in which the explosion-proof function operates reliably when the internal pressure increases even if the operation space for the explosion-proof function is small.

The alkaline battery according to the present invention is a container that also serves as one of the positive electrode terminal and the negative electrode terminal, the positive electrode and the negative electrode housed in the container, and the caulking and fixing to the opening of the container via a sealing gasket. An alkaline battery comprising: the other electrode terminal plate; and the other electrode current collecting rod in electrical contact with the other electrode terminal plate,
The sealing gasket includes a boss portion into which the other electrode current collector rod is inserted, a cylindrical outer wall portion disposed between the opening of the container and the other electrode terminal plate, the boss portion, and the cylindrical outer wall. Comprising a collar part connecting the parts,
The flange portion has an annular valve membrane and a bent portion bent from the periphery of the valve membrane toward the other electrode terminal plate, and the bent portion is compared with a side portion on the opposite side of the valve membrane side. It is characterized by being long and thick.

  ADVANTAGE OF THE INVENTION According to this invention, even if the operation space of an explosion-proof function is small, the alkaline battery with which an explosion-proof function operates reliably at the time of internal pressure rise can be provided.

  As shown in FIG. 8, in the alkaline battery in which the cap-shaped negative terminal plate 32 is caulked and fixed to the positive electrode can 31 via the sealing gasket 33, considering only space saving, the structure of the sealing gasket 33 is The structure is preferably in close contact with the inner surface of the negative electrode terminal plate 32.

  Further, when sealing performance is taken into consideration, as shown in FIG. 9, as the sealing gasket 35, a boss portion 36 into which the negative electrode current collecting rod 34 is press-fitted and penetrated, a cylindrical outer wall portion 37, a boss portion 36 and a cylindrical outer wall portion 37. It is desirable to have an annular groove 39 provided in the vicinity of the outer periphery of the flange 38 connecting the two. Further, the negative terminal plate 40 is preferably a dish-shaped lid having a protrusion 40a on the upper surface that serves as a negative terminal. The sealing gasket 35 is disposed in the opening of the positive electrode can 31, the periphery of the negative electrode terminal plate 40 is inserted into the annular groove 39 of the sealing gasket 35, and the upper end of the opening of the positive electrode can 31 is the cylindrical outer wall of the sealing gasket 35. A good sealing property can be obtained by bending inward by caulking together with the upper end of the portion 37. Moreover, as for the length of the boss | hub part 36 and the length of the cylindrical outer wall part 37, it is desirable to ensure minimum required length by the combination with various sealing agents.

  Next, in order to add an explosion-proof function, it is necessary to provide a portion to be broken and a portion to be deformed by an increase in internal pressure. An example of this is shown in FIGS.

  As shown in FIG. 10, the flange portion 38 of the sealing gasket 35 is flattened to provide a space between the negative electrode terminal plate 40. Moreover, the annular thin film part (valve film) 41 is formed by reducing the thickness of the flange part 38 around the boss part 36. Further, a gas vent hole 42 is provided in the negative terminal plate 40.

  However, according to the alkaline battery configured as shown in FIG. 10, the connecting portion connected to the thin film portion 41 is bent as a whole when the internal pressure rises, so that the amount of deformation is large, and the connecting portion is negative before the thin film portion 41 breaks. It is easy to come into contact with the inner surface of the terminal board 40, and the thin film portion 41 is less likely to break at a predetermined pressure. Moreover, if a sufficient space for the connecting portion to deform is secured, it is disadvantageous for improving the battery internal volume.

  As a result of investigating in detail the behavior when the internal pressure rises and the thin film portion 41 breaks with the sealing gasket 35 having the configuration shown in FIG. 10, the internal pressure rises and the thin film portion 41 around the boss portion 36 as shown in FIG. As shown in FIG. 12, when the thin film portion 41 can no longer be extended, it is found that the explosion-proof function is exhibited. At this time, it was found that the portion with the largest change amount was not the thin film portion 41 but the vicinity of the center of the connecting portion. Conversely, it has been clarified that the amount of change on the outer peripheral side of the connecting portion is a small amount of change compared to the amount of change near the center of the connecting portion.

  From the behavioral survey of the thin film part and the connecting part connected to it when the internal pressure rises, it is clear that the working space required when the explosion-proof function operates on the outer peripheral side of the connecting part can be reduced compared to that on the inner peripheral side, We have found that this space can be reduced to save space.

  As in the present invention, an annular valve membrane is formed on the flange connecting the boss portion of the sealing gasket and the cylindrical outer wall portion, and the bent portion is bent from the periphery of the valve membrane toward the other electrode terminal plate (for example, the negative electrode terminal plate). The side of the valve membrane side of the bent portion is longer and thicker than the side of the opposite side, so that when the internal pressure rises, the gas pressure concentrates on the side of the valve membrane. Is thick and long, rather than being bent, the valve membrane can be ruptured by almost parallel translation upward. Therefore, it is not necessary to bend the collar part to break the valve membrane, and it is not necessary to deform the entire collar part. Therefore, the deformation amount of the collar part required for the fracture of the valve membrane can be reduced, and the working space is reduced. The battery capacity can be increased by reducing the size, and the operation of the explosion-proof function can be made more reliable.

  When the working space is reduced to the limit with the sealing gasket with the above structure, when the valve membrane breaks due to an increase in internal pressure, it is difficult for the gasket collar to adhere to the inner surface of the terminal plate and to efficiently release the gas to the outside. There is. By providing a plurality of protrusions on the surface of the flange facing the other electrode terminal plate, it is possible to avoid the gasket from being in close contact with the other electrode terminal plate, and to ensure a degassing path. .

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic cross-sectional view showing an alkaline battery according to a first embodiment of the present invention. 2 to 4 are schematic views showing the operation when the explosion-proof mechanism of the alkaline dry battery of FIG. 1 is operated.

  The positive electrode can 1 has a bottomed cylindrical shape, and the bottom surface projects outwardly, and this convex portion functions as the positive electrode terminal 2. Further, below the opening of the positive electrode can 1, a step 3 (bead portion) protruding inward is provided so that a sealing gasket described later is disposed. The positive electrode can 1 can be formed from, for example, a metal such as a cold-rolled steel sheet on which a nickel plating or nickel alloy plating layer is formed.

  On the inner peripheral surface of the positive electrode can 1, a conductive film (not shown) mainly composed of graphite powder is formed on a portion located below the step 3.

  The cylindrical positive electrode mixture 4 is accommodated in the positive electrode can 1, and the outer peripheral surface thereof is in contact with the conductive coating on the inner surface of the positive electrode can 1. The positive electrode mixture 4 can be obtained, for example, by mixing manganese dioxide powder and graphite powder and press-molding them into a hollow cylindrical shape at a predetermined pressure using a molding die. The bottomed cylindrical separator 5 is obtained by integrating a bottom paper into an opening of a cylindrical tube paper, and is disposed in a hollow portion of the positive electrode mixture 4. The separator 5 is formed from a nonwoven fabric of vinylon and PVA fibers, for example. The upper end of the opening of the separator 5 is bent inward along the short side portion of the bent portion of the sealing gasket 8 described later. Thereby, the opening part of the separator 5 can be covered with the collar part 11 of the sealing gasket 8, and it can avoid that the contents (the gel-like negative electrode mentioned later) spill out from the inside of the separator 5. FIG.

  The gelled negative electrode 6 is filled in the separator 5. For the gelled negative electrode 6, for example, a gelled zinc negative electrode containing non-glazed zinc alloy powder, an alkaline electrolyte, and polyacrylic acid as a gelling agent can be used.

  The negative electrode terminal plate 7 also serves as a sealing plate for the positive electrode can 1, and is caulked and fixed to the opening of the positive electrode can 1 via a sealing gasket 8. Here, the opening refers to a portion located above the step 3.

  The sealing gasket 8 is made of a polyamide resin such as nylon 6 or 6, for example. The sealing gasket 8 includes a cylindrical boss portion 9 into which the negative electrode current collector rod is inserted, a cylindrical outer wall portion 10, and a flange portion 11 that connects the boss portion 9 and the cylindrical outer wall portion 10. . The cylindrical outer wall portion 9 is disposed in a compressed state by caulking between the inner surface of the opening of the positive electrode can 1 and the negative electrode terminal plate 7. Moreover, the collar part 11 functions as an internal sealing board.

  The thickness of the periphery of the boss | hub part 9 is the thinnest among the collar parts 11, and functions as the annular valve membrane 12. The peripheral edge of the collar portion 11 is depressed downward, and an annular recess 13 is formed. As a result, it is possible to sufficiently secure the height of the cylindrical outer wall portion 10 and to absorb the force applied in the radial direction of the positive electrode can 1 during the caulking process by the annular recess 13. It is possible to prevent the valve membrane 12 from being deformed during processing. The annular recess 13 is disposed on the step 3 of the positive electrode can 1.

A portion of the collar portion 11 located between the valve membrane 12 and the annular concave portion 13 is bent in a shape toward the upper side (negative electrode terminal side). The length L ₁ of the bent portion 14 on the side of the valve membrane 12 (hereinafter referred to as a long side portion) is longer than the length L _{2 of} the opposite side portion (hereinafter referred to as a short side portion). ing. Here, the length L ₁ of the long side portion is from the boundary (thickness displacement point) between the valve membrane 12 and the bent portion 14 to the bent point when viewed from the inner surface side (opposite side of the negative electrode terminal) of the flange portion 11. The length of On the other hand, the length L ₂ refers to the length from the bending point to the end point (in the case of FIGS. 1 and 2, the boundary between the bending portion 14 and the flat portion 15) when viewed from the inner surface side of the flange portion 11. Further, in the bent portion 14, the long side portion L ₁ is thicker than the short side portion L ₂ .

In FIG. 1, the thickness of the bent portion 14 is thicker than the thickness of the valve membrane 12, but the thickness of the short side portion L ₂ of the bent portion 14 may be equal to the thickness of the valve membrane 12. In addition, it is desirable that the thickness of the bent portion 14 is thicker than the thickness of the valve membrane 12 from the viewpoint of reliably operating the explosion-proof function.

  The negative electrode terminal plate 7 is a dish-shaped lid body, and the upper surface protrudes in a convex shape, and the convex portion functions as a negative electrode terminal. In addition, a plurality of gas vent holes 16 are opened in the negative electrode terminal plate 7 so as to surround the convex portion (negative electrode terminal). The peripheral edge of the negative electrode terminal plate 7 is inserted into the annular recess 13 of the sealing gasket 8. The negative electrode terminal plate 7 can be formed from, for example, a metal such as a cold-rolled steel plate formed with a nickel plating or nickel alloy plating layer.

  The upper end of the opening of the positive electrode can 1 is bent inward by caulking together with the upper end of the cylindrical outer wall portion 10 of the sealing gasket 8. The positive electrode can 1 is processed so that the diameter of the insertion portion of the sealing gasket 8 is slightly larger, and the sealing gasket 8 and the negative electrode terminal plate 7 are fitted therein to reduce the diameter, thereby compressing the cylindrical outer wall portion 10 of the sealing gasket 8. State. At this time, the sealing gasket 8 is deformed in the center (boss portion 9) direction, but only the thin portion connecting the bottom surface of the annular recess 13 of the sealing gasket 8 and the flat portion 15 is deformed, and the flat portion 15 is affected. Therefore, the deformation of the valve membrane 12 is suppressed, and high sealing performance can be ensured.

  For example, the negative electrode current collector rod 17 made of brass is inserted into the boss portion 9 of the sealing gasket 8, and the head is electrically contacted with the negative electrode terminal plate 7 by being welded to the inner surface of the negative electrode terminal plate 7. The tip is inserted into the gelled negative electrode 4.

As described above, when the internal pressure increases due to gas generation, the gas pressure is concentrated on the inner peripheral side. Therefore, according to the alkaline dry battery having the above-described structure, the gas pressure can be concentrated on the long side portion L ₁ of the bent portion 14. it can. As a result, as shown in FIG. 3, the long side portion L ₁ is moved to the negative electrode terminal plate 7 side by the gas pressure rather than being bent, and the long side portion L ₁ is torn off from the valve membrane 12 so as to be broken. Therefore, the deformation amount of the flange portion 11 necessary for breaking the valve membrane 12 can be reduced. As a result, the space between the negative electrode terminal plate 7 and the flange portion 11 which is a space necessary for the operation of the explosion-proof function can be reduced, and even if the space is saved, it can be reliably broken. After the rupture, as shown in FIG. 4, the gas in the battery is discharged to the outside through the vent hole 16 of the negative electrode terminal plate 7 from the ruptured portion of the valve membrane 12, so that the rupture of the battery can be prevented in advance. .

  Further, by forming the bent portion 14, the opening end of the separator 5 can be bent inward along the bent portion 14, and the opening portion of the separator 5 can be closed by the bent portion 14. It is possible to suppress spilling.

The length of the long side portion L ₁ is desirably 1.5 times or more and 3 times or less of the length of the short side portion L ₂ . This is due to the reason explained below. When the length of the long side portion L ₁ to less than 1.5 times the length of the shorter side portion L _2, shorter side portion as well as the long sides L ₁ when the internal pressure rises L ₂ becomes susceptible to high gas pressure The short side portion L ₂ is bent and stretched by the gas pressure, and the valve membrane 12 may not be broken even when the predetermined internal pressure is reached. On the other hand, when the length of the long side portion L ₁ exceeds three times the length of the short side portion L ₂ , the amount of deformation of the long side portion L _{1 when} the internal pressure increases is increased. Even if the long side portion L ₁ comes into contact with the inner surface of the negative electrode terminal plate 7 and reaches a predetermined internal pressure, the valve membrane 12 may not break.

  Next, a second embodiment according to the present invention is shown in FIGS. Note that members similar to those described in FIG. 1 described above are denoted by the same reference numerals and description thereof is omitted.

  The alkaline battery according to the second embodiment has the same structure as the alkaline battery shown in FIG. 1 except that a protrusion is provided on the surface of the sealing gasket 8 on the negative electrode terminal plate side.

The plurality of outer peripheral ribs 20 are concentrically formed on the surface of the sealing gasket 8 on the negative electrode terminal plate side (upper surface in FIGS. 5 and 7) so as to straddle the long side portion L ₁ and the short side portion L ₂ from the bending point. Has been placed. A space is provided between the outer peripheral ribs 20. The plurality of inner peripheral ribs 21 are concentrically arranged at positions corresponding to spaces provided between the outer peripheral ribs 20 in the long side portion L ₁ .

  As shown in FIGS. 5 to 7, by providing the ribs 20 and 21 concentrically on the surface of the sealing gasket 8 on the negative electrode terminal plate side, the ribs 20 and 21 are formed when the flange portion 11 is pushed up by the gas pressure. By contacting the inner surface of the negative electrode terminal plate 7, it is possible to prevent the flange portion 11 from coming into close contact with the inner surface of the negative electrode terminal plate 7, and to ensure a degassing path. Further, by shifting the positions of the inner peripheral rib 21 so that the outer peripheral rib 20 does not face the inner peripheral rib 21, the negative electrode active material (for example, zinc alloy particles) ejected together with the gas is separated from the inner peripheral rib 21. It is possible to avoid closing the gas venting path by filling the gap between the outer peripheral ribs 20. Thereby, gas diffusion can be performed smoothly.

  In the first and second embodiments described above, the terminal formed on the container is the positive electrode terminal, and the terminal formed on the sealing plate is the negative electrode terminal. However, the terminal formed on the container is the negative electrode terminal, and the sealing plate is The terminal to be formed can be a positive electrode terminal.

  Further, in the first and second embodiments described above, the valve membrane is provided in the vicinity of the periphery of the boss portion. However, the valve membrane may be formed between the periphery of the boss portion and the cylindrical outer wall portion. For example, it is also possible to provide the valve membrane a little away from the periphery of the boss portion.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

[Example]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings described above.

Example 1
A cold rolled steel plate material on which a nickel alloy plating layer was formed was used to produce a positive electrode can. A conductive film mainly composed of graphite powder was formed on the inner peripheral surface of the portion located below the step (bead portion) of the positive electrode can.

  The positive electrode can was filled with a positive electrode mixture that was pressure-formed in a cylindrical shape, and then a bottomed cylindrical separator was disposed in the hollow portion of the positive electrode mixture. After the gelled zinc negative electrode was filled in the separator, the above-described ribbed sealing gasket having the structure shown in FIG. 5 was disposed on the step of the positive electrode can.

This sealing gasket has an outer diameter of 13.75 mm, a thickness of the valve membrane of 0.2 mm, a thickness of the long side portion L ₁ of the bent portion is 0.4 mm, and a thickness of the short side portion L ₂ of 0.2 mm. 21 mm. Further, the length of the long side portion L ₁ is 1.52 mm, which corresponds to 1.8 times the length of the short side portion L ₂ .

  A negative electrode current collector rod having a negative electrode terminal plate welded to the head was inserted through the boss portion of the sealing gasket and penetrated, and the tip portion was inserted into the gelled negative electrode. Moreover, the periphery of the negative electrode terminal plate was inserted into the annular recess of the sealing gasket.

  Next, the upper end of the opening of the positive electrode can is sealed by bending inward by caulking together with the cylindrical outer wall portion of the sealing gasket, and the JIS standard LR6 type (AA type) having the structure shown in FIG. An alkaline battery was assembled.

(Example 2)
An alkaline battery having the same configuration as that described in Example 1 is assembled except that the length of the long side portion L ₁ is 1.41 mm and is 1.5 times the length of the short side portion L _2. It was.

(Example 3)
An alkaline dry battery having the same configuration as described in Example 1 was assembled except that the length of the long side portion L ₁ was 1.59 mm and was twice the length of the short side portion L ₂ .

Example 4
An alkaline dry battery having the same configuration as described in Example 1 was assembled except that the length of the long side portion L ₁ was 1.90 mm and was three times the length of the short side portion L ₂ .

(Comparative Example 1)
The flat part is formed without forming the bent part, the thickness of the flat part from the valve membrane side to 1.4 mm is 0.4 mm, and the remaining part of the flat part (0.6 mm, the valve membrane 12, the bottom surface of the annular recess 13 and Except for using a sealing gasket in which the thickness of the flat portion 15 (excluding the flat portion 15) is 0.21 mm and the valve membrane side of the flat portion is a long side thick portion, the configuration is the same as that described in Example 1 above. An alkaline battery was assembled.

(Comparative Example 2)
A bent part is formed so that the lengths of both sides are equal to 1.17 mm, the thickness of one side part (valve side) of the bent part is a thick part of 0.4 mm, and the other side part An alkaline dry battery having the same structure as that described in Example 1 was assembled except that a sealing gasket having a thickness of 0.21 mm was used.

(Comparative Example 3)
The implementation described above, except that the long side portion L ₁ of the bent portion has a thickness of 0.21 mm and the short side portion L _{2 has} a thickness of 0.4 mm, and the long side portion L ₁ uses a thin sealing gasket. An alkaline dry battery having the same configuration as described in Example 1 was assembled.

1000 alkaline dry batteries obtained in Examples 1 to 4 and Comparative Examples 1 to 3 were prepared, and the number of batteries that burst when charged in a charger for 1 hour at a current of 0.9 A was measured. The results are shown in Table 1 below.

  As is apparent from Table 1, the flange portion of the sealing gasket is bent from the periphery of the valve membrane toward the negative electrode terminal plate, and the side portion of the bent portion on the valve membrane side is longer and thicker than the opposite side portion. According to the alkaline dry batteries of Examples 1 to 4, the number of ruptures during the charge test could be reduced.

  On the other hand, according to the alkaline dry batteries of Comparative Examples 1 to 3, the number of ruptures during charging was larger than that of Examples 1 to 4. This is because in Comparative Example 1, since the flat portion was formed without providing the bent portion, the entire portion was bent by the gas pressure, and the flat portion was easy to contact the inner surface of the negative electrode terminal plate before the valve membrane was activated. Guessed. In Comparative Example 2, since the length of the bent portion was equal, the stress due to the gas pressure was diffused almost equally to the two sides, and the valve membrane was not easily broken. Further, in Comparative Example 3, it is assumed that the long side portion was easily bent because the thickness of the long side portion was thin, and the long side portion was easy to contact the inner surface of the negative electrode terminal plate before the valve membrane was activated. .

  As described above in detail, according to the present invention, it is possible to achieve space saving and increase the battery internal volume while ensuring the reliable operation of the explosion-proof function when the internal pressure increases and the sealing performance.

1 is a schematic cross-sectional view showing an alkaline battery according to a first embodiment of the present invention. The typical sectional view which expanded the explosion-proof mechanism part of the alkaline dry battery of FIG. The schematic diagram for demonstrating the action | operation mechanism of the explosion-proof mechanism of the alkaline dry battery of FIG. The schematic diagram for demonstrating the action | operation mechanism of the explosion-proof mechanism of the alkaline dry battery of FIG. Sectional drawing which shows the sealing gasket which the alkaline dry battery which concerns on the 2nd Embodiment of this invention comprises. The partial top view which shows the sealing gasket of FIG. The typical sectional view which expanded the explosion-proof mechanism part of the alkaline dry battery concerning a 2nd embodiment of the present invention. The typical sectional view which expanded the sealing part of the alkaline dry battery of the conventional example. The typical sectional view which expanded the sealing part of the alkaline dry battery of another conventional example. Furthermore, the typical sectional drawing which expanded the explosion-proof mechanism part of the alkaline dry battery of another prior art example. The schematic diagram for demonstrating the action | operation mechanism of the explosion-proof mechanism of the alkaline dry battery of FIG. The schematic diagram for demonstrating the action | operation mechanism of the explosion-proof mechanism of the alkaline dry battery of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Positive electrode can, 2 ... Positive electrode terminal, 3 ... Level difference, 4 ... Positive electrode mixture, 5 ... Separator, 6 ... Gel-like negative electrode, 7 ... Negative electrode terminal plate, 8 ... Sealing gasket, 9 ... Boss part, 10 ... Cylindrical shape Outer wall part, 11 ... collar part, 12 ... valve membrane, 13 ... annular recess, 14 ... bent part, 15 ... flat part, 16 ... gas vent hole, 17 ... negative electrode terminal rod, 20 ... outer peripheral side rib, 21 ... inner peripheral side rib.

Claims (3)

A container serving as one of the positive electrode terminal and the negative electrode terminal; a positive electrode and a negative electrode housed in the container; the other electrode terminal plate fixed by caulking to the opening of the container via a sealing gasket; An alkaline battery having a current collector rod in electrical contact with the electrode terminal plate,
The sealing gasket includes a boss portion into which the other electrode current collector rod is inserted, a cylindrical outer wall portion disposed between the opening of the container and the other electrode terminal plate, the boss portion, and the cylindrical outer wall. Comprising a collar part connecting the parts,
The flange portion has an annular valve membrane and a bent portion bent from the periphery of the valve membrane toward the other electrode terminal plate, and the bent portion is compared with a side portion on the opposite side of the valve membrane side. The alkaline battery is characterized by being long and thick.   The alkaline battery according to claim 1, wherein the bent portion has a protrusion formed on a surface facing the other electrode terminal plate.   3. The alkaline battery according to claim 1, wherein a length of the side portion on the valve membrane side is 1.5 times or more and 3 times or less of a length of the opposite side portion.

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