JP2020017348A - Cylindrical battery and washer for cylindrical battery - Google Patents

Abstract

To provide a cylindrical battery capable of surely suppressing scattering of a washer even if an inner pressure of a battery can is suddenly increased.SOLUTION: A cylindrical battery 1a is formed by curl processing an open end 21 side of a bottomed cylindrical battery can 2 of which a lower portion is a bottom part, and fitting a terminal board 10 via an insulation sealing gasket 7. The terminal board comprises an insulation washer 50a which is provided with a hanging flat cylindrical side surface part 14 having a gas drainage hole 12 for communicating an inside and an outside at an outer periphery of the cylindrical bottom part, and formed with a flange part 52 at an upper edge periphery of a flat cylindrical trunk part 51. The washer is formed with a projection part 55 projecting in a radial direction to the trunk part, and the projection part is fixed to the battery can in a state where the trunk part is annually mounted onto the side surface part of the terminal board while being engaged to a lower side of the open end in the battery can or the lower side of an end surface of an outer peripheral part in the sealing gasket.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a cylindrical battery and a washer for the cylindrical battery.

  As an example of a cylindrical battery that is an object of the present invention, a cylindrical alkaline dry battery is given. FIG. 1 shows a structure of a general cylindrical alkaline dry battery 1, and FIG. 1A is a longitudinal sectional view when an extension direction of a cylindrical shaft 100 is an up-down (vertical) direction. FIG. 1B is an enlarged view of a circle 101 in FIG. Hereinafter, the basic configuration and structure of an alkaline dry battery will be described with reference to FIGS. 1 (A) and 1 (B).

  The alkaline dry battery 1 includes a bottomed cylindrical metal battery can 2, an annular positive electrode mixture 3, a bottomed cylindrical separator 4 provided inside the positive electrode mixture 3, and a zinc alloy. And a negative electrode current collector 6 made of metal inserted into the negative electrode gel 5, a negative electrode terminal plate 10 made of metal, a sealing gasket 7 made of an insulating resin, and the like. You. In this structure, the positive electrode mixture 3, the separator 4, and the negative electrode gel 5 form a power generating element of the alkaline dry battery 1 in the presence of the electrolytic solution.

  The battery case 2 serving as a battery case functions as a positive electrode current collector by contacting the positive electrode mixture 3, and has a convex positive electrode terminal 8 protruding outward on the bottom surface. Here, when the vertical direction is defined with the bottom side of the battery can 2 as the lower side, the negative electrode terminal plate 10 is formed with a flat cylindrical side portion 14 which is vertically shortly suspended downward at the periphery of the disk-shaped bottom portion 11, A circular flange-shaped peripheral portion 13 is formed around the lower end of the side surface portion 14, and has a shape like a flat cup having a flange as a whole.

  The sealing gasket 7 is formed by forming an outer peripheral portion 71 composed of a wall surface standing upright around a disk-shaped region in which concavities and convexities are formed concentrically, and the upper and lower surfaces of the disk-shaped region are located at the center of the disk-shaped region. A hollow cylindrical boss protruding to the side is formed. The rod-shaped negative electrode current collector 6 inserted into the negative electrode gel 5 is inserted into the boss portion of the sealing gasket 7 in a press-fit state while being welded at the upper end to the lower surface of the bottom 11 of the negative electrode terminal plate 10 to be erected and fixed. . The negative electrode terminal plate 10 and the sealing gasket 7 are configured to seal the opening of the battery can 2. The battery can 2 is provided from the outside of the battery can 2 in a state where the outer peripheral portion of the sealing gasket 7 is sandwiched between the inner surface of the opening end of the battery can 2 and the edge of the peripheral portion 13 of the negative electrode terminal plate 10. It is sealed by being swaged. In addition, in the alkaline dry battery 1 shown here, as shown in FIG. 1B, the peripheral edge portion 13 of the negative electrode terminal plate 10 which was initially in the shape of a hollow disk of the battery can 2 faces outward from the axis 100 direction. While being bent obliquely downward, the edge is deformed so as to be bent upward at an acute angle. The open end 21 side of the battery can 2 is curled and bent inward on the side of the cylindrical shaft 100, and the end face 72 of the outer peripheral portion 71 of the sealing gasket 7 also extends inward along the inner surface shape of the battery can 2. It is bent toward.

  The alkaline dry battery 1 functions as a power storage element with the above configuration and structure. However, in the alkaline dry battery 1 provided as a product, as described in Non-Patent Document 1 below, an outer package 9 made of a heat-shrinkable film is provided around a battery can 2. In the case of an alkaline dry battery of a relatively small size such as an AA type or an AAA type, the opening end 21 side of the battery can 2 is curled so that the gap between the opening end 21 and the side surface portion 14 of the negative electrode terminal plate 10 is formed. Close. Therefore, in order to prevent a short circuit between the positive electrode and the negative electrode, a ring-shaped washer 50 made of an insulating resin is mounted around the outer periphery of the side surface portion 14 of the negative electrode terminal plate 10.

  FIG. 2 specifically shows the structure of the washer 50. FIG. 2A is a perspective view when the washer 50 is viewed from above, and FIG. 2B is a perspective view when the washer 50 is viewed from below. The washer 50 has a shape in which a circular flange 52 is integrally provided at the upper end of a flat cylindrical body 51 having both ends open. Then, referring to FIG. 1B, in the washer 50, the hollow portion 53 of the body portion 51 is fitted to the outer periphery of the side surface portion 14 of the negative electrode terminal plate 10 with the flange portion 52 facing upward. In addition, when the outer package 9 of the alkaline dry battery 1 is heat shrunk around the battery can 2 to be mounted thereon, the peripheral edge of the upper surface of the flange portion 52 of the washer 50 is pressed down by the outer package 9, so that the washer 50 In addition to the fitting with the side surface portion 14 of the negative electrode terminal plate 10, the negative electrode terminal plate 10 is also fixed by the exterior body 9.

  Incidentally, the sealing gasket 7 of the alkaline dry battery 1 has a thin portion having a partially reduced thickness in the disk region, and gas is generated inside the alkaline dry battery 1 due to, for example, generation of gas inside the alkaline dry battery 1. When the pressure rises, the thin portion breaks first. Further, a gas vent hole 12 that connects the inside and outside of the battery can 2 is formed in the side surface portion 14 of the negative electrode terminal plate 10. Thereby, when the thin portion of the sealing gasket 7 breaks, the gas inside the battery 1 is exhausted from the gas vent hole 12, and the internal pressure is released. That is, the thin portion of the sealing gasket 7 and the gas vent hole 12 of the negative electrode terminal plate 10 constitute an explosion-proof safety mechanism for preventing the rupture of the alkaline dry battery 1.

  In the case of an alkaline dry battery 1 having a relatively small size such as an AA type or an AAA type, the internal pressure increases greatly even with a small amount of gas due to its small volume, and the electrolyte leaked from the gas vent hole 12 causes May fly around. Therefore, the washer 50 also has a function of preventing the electrolytic solution from being scattered with the exhaust. Specifically, the body portion 51 of the washer 50 covers the side surface portion 14 of the negative electrode terminal plate 10, so that when the explosion-proof safety mechanism is activated, the speed at which the gas or the electrolyte is ejected from the gas vent hole 12 is reduced. In this way, the device in which the alkaline dry battery 1 is incorporated is hardly contaminated. When the explosion-proof safety mechanism operates, the body of the washer 50 that normally covers the side surface portion 14 of the negative electrode terminal plate 10 from the gas vent hole 12 as shown by the thick solid arrow 110 in FIG. The gas is exhausted to the outside of the alkaline dry battery 1 through a path extending through the inner surface of the negative electrode terminal plate 10 above the alkaline dry battery 1 through the inner surface of the negative electrode terminal plate 51. The following Non-Patent Document 1 describes a basic configuration and an assembling procedure of an alkaline dry battery.

FDK Corporation, "Until Alkaline Batteries Can Be Made", [online], [Search on June 29, 2018], Internet <URL: http://www.fdk.co.jp/denchi_club/denchi_story/arukari.htm >

  A washer provided in a cylindrical battery such as an alkaline dry battery prevents the electrolyte from scattering from gas vent holes provided in the negative electrode terminal plate when the explosion-proof safety mechanism operates. However, in the conventional cylindrical battery, as shown in FIGS. 1A and 1B, the peripheral edge of the upper surface of the flange portion 52 of the washer 50 is covered with the outer package 9 made of a heat-shrinkable film. In FIG. 1 (B), there is no escape of gas from the space 30 indicated by hatching with vertical stripes.

  When gas is rapidly generated inside the battery can 2 for some reason, the gas escapes into the space 30 along a path indicated by a thick dotted arrow 111 in FIG. The space is filled and the pressure in the space 30 rises at once. Then, the pressure is applied to the lower surface of the flange portion 52 of the washer 50, and attempts to push the washer 50 upward. Unlike the metal battery can 2, the exterior body 9 is soft and easily deformed, so that the force for pushing up the washer 50 cannot be suppressed, and as a result, the washer 50 falls off. In some cases, the washer 50 scatters vigorously.

  Therefore, an object of the present invention is to provide a cylindrical battery and a washer for a cylindrical battery that can prevent the washer from falling off even if the internal pressure of the battery can suddenly increases.

One embodiment of the present invention for achieving the above object has a power generating element housed in a bottomed cylindrical battery can also serving as a current collector for one electrode, and the other is provided on the open end side of the battery can. A cylindrical battery in which the battery can is hermetically sealed by fitting a terminal plate also serving as a terminal of an electrode via an insulating sealing gasket,
It is made of an insulating resin, and includes a washer in which a circular flange-shaped flange portion is formed on an upper peripheral edge of a flat cylindrical body portion whose upper and lower ends are open,
With the bottom of the battery can facing downward,
The terminal plate has a flat cylindrical side surface vertically suspended from a periphery of a disk-shaped bottom portion, a peripheral portion formed in a circular flange shape at a lower peripheral edge of the side surface portion, and an inside and outside of the side surface portion. And a vent hole to communicate
The sealing gasket has an outer peripheral portion formed of a wall surface standing upright around a disk portion, and the outer peripheral portion is sandwiched between the peripheral portion of the terminal plate and the inner surface of the battery can,
The battery can is curled on the open end side, and the end face side of the outer peripheral portion of the sealing gasket is bent inward together with the open end side of the battery can,
The washer is formed with a projection that projects outward from the body relative to the radiation,
In the washer, the projection is engaged with a lower side of the open end of the battery can or a lower side of an end surface of the outer peripheral portion of the sealing gasket, and the body is attached to a side surface of the terminal plate. It is fixed to the battery can in a mounted state,
It is a cylindrical battery characterized by the above.

  A tongue may be provided at a lower end of the flange, and the protrusion may be formed on the tongue. Alternatively, the protrusion may be formed on an outer peripheral surface of the body. When the protrusion is formed on the outer peripheral surface of the body, a tongue piece is formed on the body by a pair of notches extending vertically from a lower end, and the protrusion is formed by the tongue. It may be formed on a piece.

  The battery may be a cylindrical battery in which the washer is fitted around the side surface of the terminal plate in a fitted state. It is more preferable that two or more of the protrusions are formed at equal angular intervals around the washer.

According to another aspect of the present invention, a power generating element is housed in a bottomed cylindrical battery can serving also as a current collector of one electrode, and a terminal plate serving also as a terminal of the other electrode is provided in an opening of the battery can. In a cylindrical battery in which the battery can is hermetically sealed by being fitted via an insulating sealing gasket, the battery can is attached to the opening of the battery can and insulates the open end of the battery can from the terminal plate. A washer for performing
It is made of an insulating resin, and a circular flange-shaped flange portion is formed on the upper peripheral edge of a flat cylindrical body portion whose upper and lower ends are open,
A protrusion that engages with the lower surface on the upper end side of the battery can or the lower surface on the upper end side of the sealing gasket is formed to protrude outward in the radial direction with respect to the body.
It is characterized by:

  ADVANTAGE OF THE INVENTION According to this invention, the cylindrical battery and the washer for a cylindrical battery which can suppress the fall of a washer even if the internal pressure of a battery can rises sharply are provided. Other effects will be clarified in the following description.

It is a figure showing the structure of the general alkaline dry battery which is an example of a cylindrical battery. It is a figure showing a washer attached to the negative electrode terminal board of the above-mentioned general alkaline dry battery. It is a figure showing the washer for cylindrical batteries concerning the example of the present invention. It is a figure showing an example of the state where the washer concerning the above-mentioned example is being fixed to the cylindrical battery. It is a figure showing other examples of a state where a washer concerning the above-mentioned example is being fixed to a cylindrical battery. It is a figure showing a washer concerning a modification of the present invention. FIG. 9 is a diagram illustrating an example of a state where a washer according to the modification is fixed to a cylindrical battery. It is a figure showing a washer concerning other examples of the present invention.

  Embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings used in the following description, the same or similar parts may be denoted by the same reference numerals and redundant description may be omitted. Unnecessary reference numerals may be omitted in the description depending on the drawings.

=== Example ===
The cylindrical battery washer according to the embodiment of the present invention has a structure in which a dish-shaped terminal plate also serving as the other electrode is fitted to the opening of the battery can also serving as one electrode via a sealing gasket. The present invention can be applied to a cylindrical battery in which a gas vent hole for releasing the internal pressure of the battery can is formed on the outer periphery of the terminal plate. In addition, the power generation system of the cylindrical battery may be any system regardless of the primary battery or the secondary battery. In the following, as a specific example of the present invention, a washer for a cylindrical battery provided in a cylindrical alkaline dry battery (hereinafter, also referred to as a washer) will be described. The basic structure of the alkaline dry battery provided with the washer according to the embodiment is the same as the general alkaline dry battery 1 shown in FIG.

  FIG. 3 shows a washer 50a according to the embodiment of the present invention. FIG. 3A is a perspective view when the washer 50a is viewed from above, and FIG. 3B is a perspective view when the washer 50a is viewed from below. The washer 50a is a molded product made of an insulating resin such as polypropylene. As shown in FIGS. 3A and 3B, a circular flange 52 is provided at the upper end of an annular body 51. The hollow part 53 is formed integrally so as to be coaxial with the body part 51, and vertically penetrates the body part 51 and the flange part 52. The hollow portion 53 has an inner diameter such that the body portion 51 and the side surface portion 14 of the negative electrode terminal plate (hereinafter, also referred to as the terminal plate 10) are fitted in a fitted state. The structure of the washer 50a so far is the same as the conventional washer 50 included in the general cylindrical battery 1 shown in FIG. However, the washer 50a according to the embodiment includes the protrusion 55 that protrudes outward from the body 51 in the radial direction. In the present embodiment, a plurality of tongues 54 are provided vertically on the lower surface of the flange 52, and a projection 55 is formed at the lower end of each tongue 54 so as to project outward in the radial direction. In the washer 50a according to the present embodiment, three tongue pieces 54 are arranged at equal angular intervals on a concentric circle of the body 51.

  FIG. 4 is a diagram illustrating a cylindrical battery provided with the washer 50a according to the embodiment (hereinafter, also referred to as a battery 1a according to the embodiment). FIG. 4 corresponds to a region indicated by a circle 101 in FIG. 1A and shows a state in which the washer 50 a is fixed to the battery can 2. As shown in FIG. 4, the washer 50 a is fitted into the side surface 14 of the terminal plate 10 while the protrusion 55 is engaged with the lower side of the open end 21 of the curled battery can 2. ing.

  As a procedure for fixing the washer 50a to the battery can 2, as in the case of the conventional washer 50, the body 51 of the washer 50a is placed from above the battery can 2 before the battery can 2 is covered with the exterior body 9. It is mounted on the side surface 14 of the terminal plate 10. However, in the washer 50a according to the present embodiment, when the body portion 51 is mounted on the side surface portion 14, the lower surface of the protrusion 55 abuts on the opening end 21 of the battery can 2 and the tongue piece 54 is bent inward in the radial direction. No. Then, when the protrusion 55 is pushed below the opening end 21, the tongue piece 54 that has been bent is restored. As a result, the protrusion 55 engages with the lower side of the open end 21 of the battery can 2, and the upward movement of the washer 50 a is restricted. That is, the battery 1a according to the embodiment has a well-known snap-fit type engagement structure including the tongue piece 54 and the projection 55 as a structure for fixing the washer 50a to the battery can 2. When the washer 50 a is fixed to the battery can 2, the exterior body 9 is thermally contracted, and the outer periphery of the upper surface of the flange 52 is covered with the exterior body 9.

  Note that the vertical length of the tongue piece 54 and the vertical position of the projection 55 in the washer 50a are appropriately determined according to the positional relationship between the opening end 21 of the battery can 2 and the end surface 72 of the outer peripheral portion 71 of the sealing gasket 7. Can be changed. Specifically, as shown in FIG. 5, in the battery 1a in which the end surface 72 of the outer peripheral portion 71 of the sealing gasket 7 projects inward from the open end 21 of the battery can 2, When the washer 50 a is fixed to the battery can 2, the projection 55 needs to be lower than the end surface 72 of the outer peripheral portion 71 of the sealing gasket 7. In any case, when designing the washer 50a, the protrusion is determined according to the relative positional relationship between the open end 21 of the battery can 2 in a curled state and the end surface 72 of the outer peripheral portion 71 of the sealing gasket 7. What is necessary is just to set the position of the part 55 suitably.

=== Loss prevention performance ===
Next, the drop-off suppression performance of the washer 50a when the explosion-proof safety mechanism of the battery 1a according to the example was operated was evaluated. Specifically, the conventional washer 50 shown in FIG. 2 and the washer 50a according to the embodiment shown in FIG. 3 are respectively manufactured by 100 pieces, and the LR6 type is manufactured using each washer (20, 20a). An alkaline battery was prepared as a sample. Next, a charging test was performed on all of the manufactured samples, gas was forcibly generated in the battery can to activate the explosion-proof safety mechanism, and the number of the samples in which the washer was dropped was counted for each sample. Here, the charging test was performed by the so-called “four-in-one-one reverse” method. That is, a total of four alkaline batteries, each consisting of one sample and three commercially available LR6 alkaline batteries, were used, and only the alkaline batteries of the sample were used in a state where the positive and negative terminals were reversed. The sample was charged by connecting in series. As a result, in the sample provided with the conventional washer 50, dropout of the washer 50 was confirmed in 90 individuals out of 100 individuals. On the other hand, in the sample provided with the washer 50a of the example, none of the 100 individuals lost the washer 50a.

  From the results of the above charging test, the conventional washer 50 and the washer 50a of the embodiment differ only in the presence or absence of the snap-fit type engagement structure by the tongue piece 54 and the projection 55. It has been confirmed that this engagement structure is extremely effective in reliably preventing the falling of the 50a.

=== Modified example ===
Next, in order to study the performance of preventing the washer from falling off by the snap fit in more detail, a washer in which the body portion 51 is loosely fitted to the side surface portion 14 of the terminal plate 10 according to the modified example of the present invention. It was made as a washer. FIG. 6 shows a washer 50b according to a modification. FIG. 6A is a perspective view when the washer 50b according to the modified example is viewed from above, and FIG. 6B is a perspective view when the washer 50b is viewed from below. FIG. 7 shows an alkaline dry battery including a washer 50b (hereinafter, also referred to as a battery 1b according to a modification). FIG. 7 corresponds to a region indicated by a circle 101 in FIG. 1A and shows a state in which the washer 50 b is fixed to the battery can 2.

  As shown in FIGS. 6A and 6B, the washer 50b has no tongue piece (reference numeral 54 in FIG. 3) formed on the lower surface of the flange portion 52, and the three protrusions 55 It is provided at equal angular intervals around the part 51. This is because the body portion 51 of the washer 50b is mounted around the side surface portion 14 of the terminal plate 10 in a loosely fitted state, so that the inner diameter of the body portion 51 is smaller than that of the conventional washer 50 and the washer 50a according to the above embodiment. This is because there is no room to provide the tongue piece 54 on the lower surface of the flange portion 52. The shape and size of the protrusion 55 are the same as those of the washer 50a according to the above embodiment. As shown in FIG. 7, in the battery 1 b according to the modification, the inner surface of the hollow portion 53 of the washer 50 b does not contact the side surface portion 14 of the terminal plate 10, and is formed on the outer peripheral surface of the body portion 51. The formed projection 55 is engaged with the lower side of the open end 21 of the battery can 2.

  Next, in order to evaluate the drop-out prevention performance of the washer 50b according to the modified example, 100 LR6 alkaline batteries 1b each having the washer 50b were manufactured, and the 100 alkaline batteries 1b were subjected to a 4-in-1 reverse method. Was subjected to a charging test. As a result, the washer 50b did not drop out of one of the 100 individuals. As described above, even if the body 51 is not fitted to the side surface portion 14 of the terminal plate 10, the washer 50 b is formed by the snap-fit method so that the protrusion 55 is formed on the outer end of the open end 21 of the battery can 2 and the sealing gasket 7. It was confirmed that the device had sufficient drop-off prevention performance only by engaging with the lower side of the end surface of the 71. In the washer 50b, since the inner surface of the hollow portion 53 is not in contact with the side surface portion 14 of the terminal plate 10, the exhaust path outward from the gas vent hole 12 of the terminal plate 10 is widened. That is, in the washer 50b, the effect that the pressure applied to itself when the gas is exhausted from the gas vent hole 12 can be reduced.

=== Other Embodiments ===
In the batteries (1a, 1b) according to Examples and Modifications, none of the washers (50a, 50b) were dropped in the charging test on 100 individuals. In the alkaline battery 1 provided with the conventional washer 50, considering that the washer 50 dropped out of 90 individuals out of 100 individuals, at least one projection 55 is formed on the washer (50a, 50b). If so, the battery (1a, 1b) provided with the washer (50a, 50b) may be considered to have a sufficient fall prevention performance. Of course, the number and formation position of the protrusions 55 can be changed as appropriate. When the number of the protrusions 55 is one, the upward pressure applied to the washers (50a, 50b) when the gas is exhausted from the gas vent hole 12 may be uneven. In consideration of such a possibility, it is preferable that the washer (50a, 50b) has two or more protrusions 55 formed at equal angular intervals.

  In the washer 50b according to the modification, the hollow portion 53 is mounted around the side surface portion 14 of the terminal plate 10 in a loosely fitted state, but, of course, the hollow portion 53 and the side surface portion 14 of the terminal plate 10 are fitted. It may be. In this case, the inner diameter of the hollow portion 53 is reduced to about the outer diameter of the side surface portion 14 of the terminal plate 10 while providing a projection 55 for engaging with the opening end 21 of the battery can 2 on the outer peripheral surface of the body portion 51. Therefore, the thickness of the body 51 naturally increases. Therefore, when the washer 50b is mounted, the body 51 is less likely to undergo stress deformation. Therefore, like the washer 50c shown in FIG. 8, two slits 56 extending upward from the lower end are formed in the body 51, and the projections 55 are provided in the region between the two slits (56, 56). I just need. Thereby, when the washer 50c is engaged with the open end 21 of the battery can 2 by a snap fit method, the region between the two slits (56, 56) is elastically deformed as a tongue piece 54, and the washer 50c is connected to the battery can 2 It becomes easy to fix against.

1, 1a, 1b cylindrical battery (alkaline dry battery), 2 battery can, 3 positive electrode mixture,
4 separator, 5 negative electrode gel, 6 negative electrode current collector, 7 sealing gasket,
8 positive electrode terminal, 9 exterior body, 10 negative electrode terminal plate, 11 bottom of negative electrode terminal plate,
12 gas vent hole, 13 peripheral part of negative electrode terminal plate, 14 side part of negative electrode terminal plate,
50, 50a, 50b, 50c washer, 51 body, 52 flange,
53 hollow part, 54 tongue piece, 55 protrusion, 56 slit,
110,111 exhaust path

Claims (7)

A power generating element is housed in a bottomed cylindrical battery can also serving as a current collector for one electrode, and a terminal plate also serving as a terminal for the other electrode has an insulating sealing gasket on the open end side of the battery can. A cylindrical battery in which the battery can is sealed by being fitted through,
It is made of an insulating resin, and includes a washer in which a circular flange-shaped flange portion is formed on an upper peripheral edge of a flat cylindrical body portion whose upper and lower ends are open,
With the bottom of the battery can facing downward,
The terminal plate has a flat cylindrical side surface vertically suspended from a periphery of a disk-shaped bottom portion, a peripheral portion formed in a circular flange shape at a lower peripheral edge of the side surface portion, and an inside and outside of the side surface portion. And a vent hole to communicate
The sealing gasket has an outer peripheral portion formed of a wall surface standing upright around a disk portion, and the outer peripheral portion is sandwiched between the peripheral portion of the terminal plate and the inner surface of the battery can,
The battery can is curled on the open end side, and the end face side of the outer peripheral portion of the sealing gasket is bent inward together with the open end side of the battery can,
The washer is formed with a projection that projects outward from the body relative to the radiation,
In the washer, the projection is engaged with a lower side of the open end of the battery can or a lower side of an end surface of the outer peripheral portion of the sealing gasket, and the body is attached to a side surface of the terminal plate. It is fixed to the battery can in a mounted state,
A cylindrical battery characterized by the above-mentioned.   2. The cylindrical battery according to claim 1, wherein a tongue is suspended from a lower end of the flange, and the protrusion is formed on the tongue. 3.   The cylindrical battery according to claim 1, wherein the protrusion is formed on an outer peripheral surface of the body.   4. The cylindrical battery according to claim 3, wherein a tongue is formed on the body by a pair of notches extending vertically from a lower end, and the protrusion is formed on the tongue. 5. A cylindrical battery characterized by the above-mentioned.   5. The cylindrical battery according to claim 1, wherein the washer is fitted around the side surface of the terminal plate in a fitted state. 6.   The cylindrical battery according to any one of claims 1 to 5, wherein two or more of the protrusions are formed at equal angular intervals around the washer. A power generating element is housed in a bottomed cylindrical battery can also serving as a current collector for one electrode, and a terminal plate also serving as a terminal for the other electrode is provided at the opening of the battery can via an insulating sealing gasket. In a cylindrical battery in which the battery can is hermetically sealed by being fitted, a washer attached to the opening of the battery can to insulate the open end of the battery can and the terminal plate,
It is made of an insulating resin, and a circular flange-shaped flange portion is formed on the upper peripheral edge of a flat cylindrical body portion whose upper and lower ends are open,
A protrusion that engages with the lower surface on the upper end side of the battery can or the lower surface on the upper end side of the sealing gasket is formed to protrude outward in the radial direction with respect to the body.
A washer for a cylindrical battery.

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