JP5095243B2 - Anode current collector for alkaline battery, alkaline battery - Google Patents

Description

  The present invention relates to a negative electrode current collector for an alkaline battery provided with a negative electrode terminal plate, a sealing gasket, a sealing plate and the like and provided with measures for explosion prevention, and an alkaline battery using the same.

  An alkaline battery using a strong alkaline aqueous solution as an electrolytic solution has advantages such as a small voltage drop during use and continuous use with a large current, so that it can be applied to game devices, portable AV devices, portable digital devices, etc. Applications are expanding. In particular, cylindrical alkaline batteries such as LR6 (AA) and LR03 (AA) have many opportunities to be used in these devices. This type of cylindrical alkaline battery is usually provided with a bottomed cylindrical metal positive electrode can also serving as a battery case. Inside the positive electrode can, an alkaline power generation element composed of a positive electrode mixture, a negative electrode mixture, and a separator impregnated with an alkaline electrolyte is accommodated. The opening of the positive electrode can is closed by a negative electrode current collector formed by integrally assembling a metal negative electrode current collector, a metal negative electrode terminal plate, a synthetic resin sealing gasket, and the like.

By the way, in this type of alkaline battery, gas is suddenly generated due to some abnormality in the inside, and the internal pressure of the battery increases, and as a result, the battery can may swell or rupture. Accordingly, various explosion-proof measures have been taken for alkaline batteries to prevent this type of accident. As a specific example, by providing a so-called explosion-proof valve in the sealing gasket, such as an annular thin portion for inducing fracture, the portion is preferentially broken when the internal pressure rises, and the gas is discharged outside the battery. It has been proposed to release the internal pressure (see, for example, Patent Document 1).
JP 2004-71446 A

  By the way, in the case of a conventional alkaline battery having an explosion-proof structure, the explosion-proof valve does not operate correctly, and as a result, the gas discharge path is blocked and the internal pressure is not sufficiently released. Therefore, in order to operate the explosion-proof valve accurately and stably, for example, a large space is provided as a working space in the vicinity of the explosion-proof valve in the sealing gasket. In addition, a concave and convex structure such as a rib is provided on the front and back surfaces of the sealing gasket itself so as to ensure a path inside the battery that can reliably release the internal pressure.

  However, when such measures are taken, the structure of the sealing gasket is complicated and thickened, and the negative electrode current collector is accordingly enlarged. Therefore, space saving of the sealing part of the alkaline battery cannot be achieved, and it becomes difficult to increase the volume (effective internal volume) that can be filled with the active material. This is one factor that hinders the life of alkaline batteries.

  The present invention has been made in view of the above-mentioned problems, and its object is to make it possible to increase the effective internal volume because it is relatively small and is advantageous for space saving of the sealing portion, and to ensure certain portions. An object of the present invention is to provide a negative electrode current collector for an alkaline battery that can be reliably explosion-proof by inducing breakage. Another object of the present invention is to provide an alkaline battery excellent in performance such as explosion-proof properties.

  In order to solve the above-mentioned problem, the invention according to claim 1 is arranged between the negative electrode terminal plate and the sealing gasket, with a negative electrode terminal plate, a sealing gasket, and a through hole formed in the center. A negative electrode current collector for an alkaline battery comprising a sealing plate, wherein the sealing gasket is formed with a thin portion for inducing breakage, and an opening edge of the through-hole is viewed from the central axis direction of the negative electrode current collector. The gist of the negative electrode current collector for an alkaline battery is characterized in that the sealing plate is disposed so as to overlap a part of the thin portion for induction. According to a second aspect of the present invention, there is provided a metal negative electrode terminal plate, a metal and rod-shaped negative electrode current collector having a proximal end fixed to the inner surface side center of the negative electrode terminal plate, and the negative electrode terminal plate. A sealing gasket disposed on the inner surface side and having a boss portion through which the negative electrode current collector is inserted and a flat plate portion connected to the boss portion, and a negative hole terminal plate and the sealing gasket having a through hole formed in the center portion A negative electrode current collector for an alkaline battery comprising a metal sealing plate disposed between the annular gasket, and an annular thin portion for inducing breakage is formed at a connecting portion between the flat plate portion and the boss portion in the sealing gasket. The gist is that the sealing plate is arranged so that the opening edge of the through hole overlaps with a part of the thin portion for fracture induction as viewed from the central axis direction of the negative electrode current collector.

  The inventions of claims 1 and 2 will be described. In these inventions, the opening edge of the through hole is arranged so as to overlap with a part of the thin portion for inducing breakage of the sealing gasket. Rather than overall deformation in the inductive thin part, partial deformation occurs. That is, the portion where the opening edge does not overlap the fracture-inducing thin portion can be freely deformed because there is no sealing plate, but the overlapping portion is prevented from being deformed by the presence of the sealing plate. Therefore, it is possible to reliably induce breakage in a predetermined portion excluding the overlapping portion, and the problem that the gas discharge path is blocked due to the overall deformation of the thin portion for breakage induction is eliminated. A route is easily secured. In addition, as a result of adopting such a structure, in order to operate the rupture-inducing thin part reliably and stably, the sealing gasket is provided with irregularities, or a large working space is provided in the vicinity of the rupture-inducing thin part. There is no need to do it. Therefore, the sealing gasket can be formed into a simple and thin shape (for example, a flat plate shape), and further, the negative electrode current collector can be reduced in size. As a result, space saving of the sealing portion of the alkaline battery can be achieved. In addition, since the sealing gasket having a simple structure can be manufactured relatively easily and inexpensively, it is advantageous for improving battery productivity and reducing costs.

  Here, it is preferable that the area of the portion where the opening edge of the through hole in the sealing plate overlaps the fracture-inducing thin portion is set smaller than the area of the non-overlapping portion. If this relationship is reversed, the ratio of the locations where deformation is suppressed due to the presence of the sealing gasket becomes too large, and it may be difficult to induce breakage.

  According to a third aspect of the present invention, in the first or second aspect, when viewed from the central axial direction of the negative electrode current collector, the thin portion for fracture induction is circular and the through hole is noncircular. Is the gist.

  Therefore, according to the third aspect of the present invention, if the through-hole has a noncircular shape, for example, a portion having a short distance from the central axis at the opening edge overlaps with a part of the thin portion for fracture induction and deforms the portion. Suppress. Therefore, it is possible to reliably induce breakage in a predetermined portion excluding the overlapping portion. Further, since the through-hole is non-circular, it is not necessary to change the design on the sealing gasket side, so that the negative electrode current collector can be easily manufactured at low cost.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, a projecting piece extending toward the central axis of the negative electrode current collector is formed at one position on the opening edge of the through hole. This is the gist.

  Therefore, according to the fourth aspect of the present invention, the protrusion is overlapped with a part of the thin part for inducing breakage to suppress the deformation thereof, thereby reliably inducing breakage at a predetermined portion except for the place where the protrusion is present. be able to.

  The gist of a fifth aspect of the present invention is that, in any one of the first to fourth aspects, the sealing gasket is made of a nylon resin having a flexural modulus of 2.5 GPa or less.

  Therefore, according to the invention described in claim 5, since the flexural modulus is 2.5 GPa or less and is relatively fragile, even if some deformation of the thin portion for fracture induction is suppressed, other than that It is possible to reliably induce breakage when the internal pressure rises at the location. The flexural modulus is preferably 1.5 GPa or more and 2.5 GPa or less, and more preferably 1.8 GPa or more and 2.2 GPa or less.

  The gist of a sixth aspect of the present invention is that, in any one of the first to fifth aspects, the sealing gasket is made of nylon 6-10 or nylon 6-12.

  Therefore, according to the invention described in claim 6, nylon 6-10 or nylon 6-12 has a low bending elastic modulus among nylon resins, and can impart suitable chemical resistance.

  The gist of the invention according to claim 7 is an alkaline battery using the negative electrode current collector for alkaline battery according to any one of claims 1 to 6.

  Therefore, according to the invention described in claim 7, by using the relatively small negative electrode current collector as described above, space saving of the sealing portion can be achieved, and the effective internal volume of the battery can be increased. . For this reason, it becomes possible to fill a larger amount of the active material than in the past, and the life of the battery can be extended. In addition, since it is possible to accurately trigger the explosion-proof structure by inducing a break in a part of the thin part for fracture induction, the internal pressure can be released sufficiently and the explosion-proof property of the battery can be improved. Can do.

  As described in detail above, according to the first to sixth aspects of the invention, since it is relatively small and advantageous for space saving of the sealing portion, it is possible to increase the effective internal volume, and to ensure the predetermined portion. It is possible to provide a negative electrode current collector for an alkaline battery that can achieve reliable explosion prevention by inducing breakage. Moreover, according to the invention of Claim 7, the alkaline battery excellent in performance, such as explosion-proof property, can be provided.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

  FIG. 1 shows an LR20 type (single type 1) cylindrical alkaline battery 11 according to this embodiment. A positive electrode can 21 constituting the cylindrical alkaline battery 11 is a bottomed cylindrical steel member that also serves as a battery case, and a power generation element 30 (a positive electrode mixture 31, a separator 41, a negative electrode) The mixture 51) can be stored. A protruding positive electrode terminal 24 is formed at the center of the bottom of the positive electrode can 21. Nickel plating (not shown) is applied to the inner and outer surfaces of the positive electrode can 21 in order to prevent iron in the steel from being corroded by alkali. A conductive film (not shown) made of carbon or the like is formed on the nickel plating on the inner surface side of the positive electrode can 21 in order to improve conductivity. An exterior label 23 is wound around the outer surface of the positive electrode can 21 in order to provide insulation and improve design.

  Inside the positive electrode can 21, two positive electrode mixtures 31 formed in a hollow cylindrical shape are vertically stacked and stored concentrically. The positive electrode mixture 31 forming a part of the power generation element 30 is a member obtained by mixing manganese dioxide and graphite in a ratio of approximately 11: 1 and molding a material to which a binder is added. Inside the positive electrode mixture 31, a bottomed cylindrical separator 41 made of a mixed paper based on vinylon fiber or rayon fiber is inserted. The separator 41 and the positive electrode material mixture 31 are infiltrated with a strong alkaline electrolyte. The hollow portion of the separator 41 is filled with a gelled negative electrode mixture 51 formed by mixing zinc powder, a gelling agent, an alkaline electrolyte, and the like. As the gelling agent, for example, carboxymethyl cellulose, polyacrylic acid and salts thereof are suitable. As the alkaline electrolyte, for example, an aqueous potassium hydroxide solution is suitable.

  As shown in FIGS. 1 and 2, a negative electrode current collector 60 formed by assembling a plurality of components is attached and caulked to the inner surface side of the opening 22 of the positive electrode can 21, and as a result, the positive electrode can 21. Is hermetically sealed. The negative electrode current collector 60 includes a negative electrode terminal plate 61, a negative electrode current collector 71, a sealing gasket 81, and a sealing plate 91.

  As shown in FIGS. 1 to 3, the sealing gasket 81 is an injection-molded part made of a nylon resin having a flexural modulus of 2.5 GPa or less, and is formed on the central axis C <b> 1 of the negative electrode current collector 60. Looking along, it has a circular shape. The sealing gasket 81 includes a boss portion 82, a flat plate portion 83, and an outer peripheral rib portion 85, and is disposed on the inner surface side of the negative electrode terminal plate 61. The cylindrical boss 82 is located at the center of the sealing gasket 81. A negative electrode current collector 71 can be inserted into a boss hole 82 a penetrating the boss portion 82. A sealant (not shown) is applied between the boss hole 82a and the negative electrode current collector 71. The flat plate portion 83 is integrally connected to the outer peripheral surface of the boss portion 82, and an annular groove is provided on the outer surface of the gasket at the connection portion. As a result of this groove processing, a rupture-inducing thin-walled portion 84 having an annular shape (in other words, circular when viewed along the central axis C1 of the negative electrode current collector 60) is formed in the connecting portion. The outer peripheral rib portion 85 is provided integrally along the outer peripheral edge of the flat plate portion 83. The fracture-inducing thin-wall portion 84 constitutes a part of a so-called explosion-proof structure portion. In the present embodiment, the depth and width of the groove processing portion are equal in each portion.

  As shown in FIGS. 1 and 2, the negative terminal plate 61 is made of a conductive metal plate such as a nickel-plated steel plate. The negative electrode terminal plate 61 includes a central flat plate portion 62 having a flat terminal surface formed on the outer surface, and an annular recess 63 formed integrally with the outer peripheral portion of the central flat plate portion 62. Although the inner side surface of the central flat plate portion 62 is not in contact with other members constituting the negative electrode current collector 60, the inner side surface of the annular recess 63 is in contact with the sealing gasket 81 through the outer peripheral portion of the sealing plate 91. In particular, a gap of about 2.5 mm is provided between the inner side surface of the central flat plate portion 62 and the fracture inducing thin portion 84 of the sealing gasket 81. Gas discharge holes (not shown) are provided at a plurality of positions on the side surface of the negative electrode terminal plate 61. These gas discharge holes communicate the battery external region with the space formed inside the negative electrode terminal plate 61 in the battery.

  As shown in FIGS. 1 and 2, the negative electrode current collector 71 is a rod having a circular cross section made of a conductive metal, and its tip 73 is inserted and disposed in the negative electrode mixture 51. Yes. On the other hand, the base end portion 72 of the negative electrode current collector 71 is inserted into the boss hole 82 a of the boss portion 82 and is fixed to the central portion of the central flat plate portion 62 of the negative electrode terminal plate 61 by spot welding or the like. As a result, the negative electrode current collector 71 extends in a direction perpendicular to the central flat plate portion 62 of the negative electrode terminal plate 61.

  As shown in FIGS. 1 to 3, the sealing plate 91 disposed between the negative electrode terminal plate 61 and the sealing gasket 81 is a flat plate member formed by punching using a metal material such as a stainless steel material, When viewed along the central axis C1 of the negative electrode current collector 60, it is circular. The diameter of the sealing plate 91 is set substantially equal to the diameter of the sealing gasket 81. A non-circular through hole 92 that is slightly larger than the boss portion 82 is formed at the center of the sealing plate 91. A substantially rectangular protruding piece 93 extending toward the central axis C <b> 1 of the negative electrode current collector 60 is formed at one position on the opening edge of the through hole 92. Then, as shown in FIG. 3C, the protrusion 93 at the opening edge of the through-hole 92 is seen from the direction along the central axis C <b> 1 of the negative electrode current collector 60. The arrangement is such that it partially overlaps.

  The operation of the thus configured alkaline battery 11 will be described. For example, in the case of misuse in which the positive electrode and the negative electrode are connected in reverse, hydrogen gas is generated in the battery, and the pressure inside the positive electrode can 21 (ie, sealing) The pressure in the inner surface side area of the gasket 81 may increase. Then, overall pressure is applied to the inner side surface of the sealing gasket 81, but at this time, the rupture-inducing thin wall portion 84 in the central portion of the gasket is preferentially deformed. However, the sealing plate 91 disposed in close contact with the outer surface of the gasket is made of a material that is harder and more rigid than the sealing gasket 81, and the protruding piece 93 at the opening edge overlaps the thin portion 84 for inducing induction. Therefore, the portion where the protrusions 93 overlap in the fracture-inducing thin-walled portion 84 is disturbed by the presence of the protrusions 93, and the deformation toward the negative electrode terminal plate 61 side is suppressed. On the other hand, since there is no obstacle on the outer surface of the portion where there is no protrusion 93, it can be deformed to the negative electrode terminal board 61 side.

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) In the present embodiment, by adopting a structure in which the sealing plate 91 having the projecting piece 93 on the opening edge is overlapped with the sealing gasket 81, it is possible to reliably induce breakage in a predetermined portion of the sealing gasket 81. It becomes. Therefore, the problem that the gas discharge path is blocked due to the overall deformation of the fracture-inducing thin portion 84 is solved, and the gas discharge path is easily secured. That is, the fracture-inducing thin-walled portion 84 that is the explosion-proof structure can be accurately operated. As a result, the internal pressure can be sufficiently released, and the explosion-proof property of the alkaline battery 11 can be improved.

  (2) Further, as a result of adopting the structure of the present embodiment, in order to operate the fracture inducing thin portion 84 reliably and stably, the sealing gasket 81 is provided with irregularities, or in the vicinity of the fracture inducing thin portion 84. It is not necessary to provide a large working space in the case. Therefore, the sealing gasket 81 can be formed in a simple and thin flat plate shape, and the negative electrode current collector 60 can be reduced in size as compared with the conventional case. As a result, space saving of the sealing part of the alkaline battery 11 can be achieved, and the effective internal volume of the battery can be increased. For this reason, it becomes possible to fill a larger amount of active material than in the past, and the life of the alkaline battery 11 can be extended.

  (3) Since the sealing gasket 81 having a simple structure can be manufactured relatively easily and inexpensively, it is advantageous for improving the productivity and reducing the cost of the alkaline battery 11.

  (4) In this embodiment, a metal sealing plate 91 having the same diameter as that of the negative electrode terminal plate 61 is used, and this is sandwiched between the negative terminal plate 61 and the sealing gasket 81 in the caulking portion in the opening 22 of the positive electrode can 21. It is fixed with. Therefore, a higher sealing strength can be obtained compared to the negative electrode current collector 60 that does not use such a sealing plate 91.

(5) The sealing gasket 81 of this embodiment is an injection-molded part that is basically formed of only a synthetic resin material. Therefore, for example, unlike a synthetic resin material in which a hard support such as a metal is embedded (see, for example, Japanese Patent Laid-Open No. 09-17402), it can be manufactured easily and inexpensively. Therefore, it is suitable for the productivity improvement and cost reduction of the alkaline battery 11.
[Example 1]

  In this embodiment, the thickness of the sealing plate 91 is set to 0.5 mm, and six types of test samples for the LR20 type (single type 1) alkaline battery 11 are prepared. went.

Samples 1, 2, and 3 are examples (comparative examples) that do not have the protrusions 93 at the opening edges of the through holes 92, and samples 4, 5, and 6 are examples (examples) that have the protrusions 93. Samples 1 and 4 use nylon 6-12 with a flexural modulus of 2.1 GPa, samples 2 and 5 use nylon 6-10 with a flexural modulus of 2.0 GPa, and samples 3 and 6 have a flexural modulus of elasticity. Nylon 66 with 2.8 GPa was used. Then, 100 test samples were prepared and a 400 mA charge test was performed, and the number of batteries in which rupture occurred was counted. Moreover, the quality was judged by the presence or absence of the occurrence of the rupture. The results are shown in Table 1. In the table, ○ means good and × means bad.

As is clear from Table 1, in Samples 1, 2, and 3 that do not have the protrusion 93, the battery burst regardless of the type of nylon resin. Therefore, in these, despite the provision of the fracture-inducing thin portion 84, it did not work well, and the reliability and stability of the explosion-proof structure was low. On the other hand, the samples 4, 5 and 6 having the projecting pieces 93 clearly have fewer battery ruptures than the samples 1, 2 and 3 which do not have the projecting pieces 93, and in particular, the samples 4 and 5 were zero. Therefore, in these two, it was considered that the internal pressure was sufficiently released as a result of the fracture-inducing thin-walled portion 84 operating correctly. Therefore, the explosion-proof structure of Samples 4 and 5 using the sealing gasket 81 made of a nylon resin having a flexural modulus of 2.5 GPa or less can be said to have high reliability and stability.
[Example 2]

  Next, as in Example 1, the thickness of the sealing plate 91 was set to 0.5 mm, and three types of test samples for the LR20 type (single type 1) alkaline battery 11 were prepared. An embrittlement test was conducted.

Sample 7 uses nylon 6-12 with a flexural modulus of 2.1 GPa, sample 8 uses nylon 6-10 with a flexural modulus of 2.0 GPa, and sample 9 uses nylon 66 with a flexural modulus of 2.8 GPa. Using. And after storing these for 50 days at 90 degreeC and dry conditions, the surface of the sealing gasket 81 was observed visually and the resin characteristic was verified. The results are shown in Table 2. In the table, ◯ means good because it is not embrittled, and x means failure because it is embrittled.

  As is clear from Table 2, it was determined that the sealing gasket 81 of sample 9 had a white resin surface and was brittle. This was presumed to be because nylon 66 was weak against chemical attack of alkaline electrolyte. On the other hand, in the sealing gaskets 81 of Samples 7 and 8, there was no change in the color of the resin surface, and it was determined that they were not particularly brittle. This is presumed to be because nylon 6-12 and nylon 6-10 are strong against chemical attack of alkaline electrolyte.

  In addition, you may change embodiment of this invention as follows.

  In the above embodiment, the present invention is embodied in the LR20 (single type 1) cylindrical alkaline battery, but other types of cylindrical alkaline batteries, such as LR14 (single type 2), LR6 (single type AA), The present invention may be embodied in LR03 (single type 4), LR1 (single type 5), and the like. Alternatively, the present invention may be embodied in a cylindrical battery such as a nickel battery (ZR type).

  -In this invention, the shape of the through-hole 92 of the sealing board 91 is not limited to the said embodiment. For example, FIG. 4 (a) shows a sealing plate 91A having a triangular protrusion 93a at one location on the opening edge. FIG. 4B shows a sealing plate 91B which is not a protruding piece but has a straight portion 93b at one position of the opening edge. FIG. 4C shows a sealing plate 91 </ b> C having a semicircular protruding piece 93 c at one location on the opening edge. FIG. 4D shows a sealing plate 91 </ b> D having rectangular protrusions 93 at two opposed positions on the opening edge. FIG. 4E shows a sealing plate 91E having semicircular protrusions 93c at four locations on the opening edge. However, among these examples, it is structurally advantageous to have a protrusion at only one location.

  In the above embodiment, as shown in FIG. 3, when viewed from the direction along the central axis C <b> 1 of the negative electrode current collector 60, the rupture-inducing thin-walled portion 84 has a circular shape, while the through hole 92 has a non-circular shape. Although it was made into a shape, it is not limited to this. For example, in another embodiment shown in FIG. 5, when viewed from the direction along the central axis C <b> 1 of the negative electrode current collector 60, the fracture-inducing thin portion 84 is noncircular, while the through-hole 92 is circular. It is said. A part of the fracture-inducing thin-walled portion 84 protrudes in the outer circumferential direction, and the opening edge of the through hole 92 overlaps the protruding portion 84a. Therefore, no deformation occurs in a portion of the fracture inducing thin portion 84 that is directly below the overhanging portion 84a, and the deformation is allowed and the fracture is induced in other portions. That is, even when this configuration is employed, it is possible to reliably induce breakage in a predetermined portion of the sealing gasket 81.

  In the embodiment described above, a gap is provided between the tip of the protruding piece 93 and the outer peripheral surface of the boss portion 82, but the tip of the protruding piece 93 is brought into contact with the outer peripheral surface of the boss portion 82. May be arranged. With this configuration, since the protruding piece 93 is supported by the boss portion 82, the deformation suppressing action of the fracture-inducing thin-wall portion 84 can be made more reliable.

  In the above embodiment, the sealing plate 91 is disposed in surface contact with the outer surface of the sealing gasket 81, but may be disposed slightly apart. However, the former is more advantageous for thinning the wall and more advantageously for stabilizing the operation of the explosion-proof structure.

  In the above-described embodiment, the outer surface of the sealing gasket 81 is grooved when forming the fracture-inducing thin portion 84, but this may be performed on the inner surface of the sealing gasket 81.

  Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the embodiments described above are listed below.

  (1) In any one of claims 2 to 7, the sealing plate is disposed in contact with the flat plate portion of the sealing gasket, and a space is provided between the sealing plate and the negative electrode terminal plate. That.

  (2) In any one of claims 4 to 7, the tip of the protruding piece is in contact with the outer peripheral surface of the boss portion.

  (3) In any one of claims 1 to 7, the sealing plate has the same diameter as the negative electrode terminal plate, and the sealing plate, the negative electrode terminal plate, and the sealing gasket are in the opening of the positive electrode can. It must be clamped and fixed in the caulking section.

  (4) In any one of claims 1 to 7, the area of the portion where the opening edge of the through hole in the sealing plate overlaps the thin portion for fracture induction is smaller than the area of the non-overlapping portion. To be set.

The schematic sectional drawing of the alkaline battery of one Embodiment which actualized this invention. The partial expanded sectional view of the negative electrode collector for alkaline batteries of embodiment. (A) is a top view of the sealing board of embodiment, (b) is a top view of the sealing gasket of embodiment, (c) is a top view when both are piled up. (A)-(f) is a top view of the sealing board of another embodiment. (A) is a top view of the sealing board of another embodiment, (b) is a top view of the sealing gasket of another embodiment, (c) is a top view when both are piled up.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Alkaline battery 60 ... Negative electrode collector for alkaline batteries 61 ... Negative electrode terminal plate 81 ... Sealing gasket 82 ... Boss part 83 ... Flat plate part 84 ... Thin part 91 for breakage induction 91, 91A, 91B, 91C, 91D, 91E ... Sealing Plate 92 ... Through hole 93, 93a, 93c ... Projection piece C1 ... Center axis of negative electrode current collector

Claims (7)

A negative electrode current collector for an alkaline battery, comprising a negative electrode terminal plate, a sealing gasket, and a sealing plate formed between the negative electrode terminal plate and the sealing gasket, with a through hole formed in the center thereof,
The sealing gasket is disposed such that a rupture-inducing thin portion is formed in the sealing gasket, and an opening edge of the through hole overlaps a part of the rupture-inducing thin portion as viewed from the central axis direction of the negative electrode current collector. A negative electrode current collector for an alkaline battery. A metal negative electrode terminal plate, a metal and rod-shaped negative electrode current collector whose base end side is fixed to the inner surface side center of the negative electrode terminal plate, and the negative electrode current collector disposed on the inner surface side of the negative electrode terminal plate. A sealing gasket having an inserted boss portion and a flat plate portion connected to the boss portion, and a metal sealing plate having a through hole formed in the center portion and disposed between the negative electrode terminal plate and the sealing gasket A negative electrode current collector for an alkaline battery comprising:
An annular rupture-inducing thin-walled portion is formed at the connecting portion between the flat plate portion and the boss portion in the sealing gasket, and the opening edge of the through-hole is viewed in the central axis direction of the negative electrode current collector. The negative electrode current collector for an alkaline battery, wherein the sealing plate is disposed so as to overlap a part of the portion.   3. The negative electrode for an alkaline battery according to claim 1, wherein when viewed from the central axis direction of the negative electrode current collector, the thin portion for fracture induction is circular and the through hole is noncircular. Current collector.   4. The alkaline battery according to claim 1, wherein a projecting piece extending toward the central axis of the negative electrode current collector is formed at one position on the opening edge of the through hole. 5. Negative electrode current collector.   The negative electrode current collector for an alkaline battery according to any one of claims 1 to 4, wherein the sealing gasket is made of a nylon resin having a flexural modulus of 2.5 GPa or less.   The negative electrode current collector for an alkaline battery according to claim 1, wherein the sealing gasket is made of nylon 6-10 or nylon 6-12.   The alkaline battery using the negative electrode collector for alkaline batteries of any one of Claims 1 thru | or 6.

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