JP2015176655A - Cylindrical battery and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylindrical battery in which liquid leakage can be more effectively prevented.SOLUTION: In a cylindrical battery which is configured so that a positive electrode drug combination, a separator and negative electrode gel are accommodated in a cylindrical positive electrode can having a bottom, and a negative electrode terminal plate is fitted in an opening of the positive electrode can through a sealing gasket 70, a rod-shaped power collection piece 51 fixedly provided to the negative electrode terminal is inserted in a through-hole of a boss portion 71 of the sealing gasket 70 so that the surface of a head portion 51a of the power collection piece 51 is brought into close contact with an upper surface 72 of the boss portion 71, and a sealing agent stock portion 73 for stocking sealing agent for forming a sealing layer for at least liquid-tightly sealing the gap between the power collection piece 51 and an inner peripheral surface 74 of the through-hole is formed at the inner peripheral end edge portion of the through-hole formed in the boss portion 71, which confronts the power collection piece 51.

Description

  The present invention relates to a cylindrical battery and a method for manufacturing a cylindrical battery.

  Cylindrical batteries are widely used in various electrical devices as primary batteries such as alkaline batteries. A configuration example of a conventional general cylindrical battery is disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2013-54859). The details of this configuration will be described later with respect to the embodiment of the present invention, but it has a substantially bottomed cylindrical positive electrode can and a positive electrode mixture arranged in a ring shape inside, and inside the positive electrode mixture The gelled negative electrode mixture is filled through the separator. A rod-shaped current collector is inserted into the positive electrode mixture from the opening side of the positive electrode can, and a negative electrode terminal plate is fixed to the current collector. The current collector is fitted with a sealing gasket for preventing leakage and preventing explosion when the internal pressure of the battery rises to prevent explosion. Specifically, the sealing gasket includes a substantially cylindrical boss portion and a disk portion that expands into a disk shape from the boss portion. When assembling the cylindrical battery, the current collector is passed through the boss of the sealing gasket, and the current collector is inserted into the gelled negative electrode mixture. Complete by tightening.

  In order to secure the sealing performance inside the battery by the sealing gasket, the current collector is press-fitted into a through-hole provided in the boss portion of the sealing gasket so as to be in a tight fit state. Furthermore, in order to improve the sealing performance at the boundary surface between the end surface of the boss portion and the current collector head surface, a sealing agent is interposed at the boundary surface. In this case, the sealant is applied to the outer peripheral surface of the current collector when the battery is assembled. When the current collector is inserted into the through hole of the sealing gasket, the sealing agent is scraped upward by the inner peripheral edge of the through hole of the boss portion when the current collector is press-fitted into the boss portion, and the upper surface of the boss portion and the collector are collected. It accumulates between the electronic head and seals the interface between the two. In this case, almost no sealant remains between the outer peripheral surface of the current collector and the inner peripheral surface of the through hole due to the scraping.

JP 2013-54859 A

  However, in the conventional cylindrical batteries such as those described in Patent Document 1 as described above, there is no sealing agent between the boss portion and the current collector, so there is a problem with the procured parts and the manufacturing process. Due to problems in the boss portion through-hole inner surface of the sealing gasket or the current collector outer peripheral surface, or when the fitting state of the boss portion and the current collector becomes loose over time, The sealing effect due to the press-fitting of the current collector into the boss portion is diminished, and there is a possibility that the electrolyte inside the battery reaches the outside through a minute gap between the boss portion and the current collector and enters a liquid leakage state. There was a problem.

  The present invention has been made to solve the above-described problems, and provides a cylindrical battery and a method of manufacturing the cylindrical battery that can more effectively prevent liquid leakage in the cylindrical battery. One purpose is to do.

  In order to solve the above-mentioned and other problems, one aspect of the present invention provides an annular positive electrode mixture and a positive electrode mixture disposed inside the bottomed cylindrical battery can. A cylindrical battery in which a bottom cylindrical separator and a negative electrode gel disposed inside the separator are housed, and a negative terminal plate is fitted into an opening of the battery can via a sealing gasket. The sealing gasket is made of a resin integrally formed in a substantially disk shape, and has a boss portion protruding in a hollow cylindrical shape in the vertical direction at the center of the disk, and the sealing gasket The rod-shaped current collector fixed to the negative electrode terminal plate in the through hole of the boss portion is in close contact with the head surface formed as an enlarged diameter portion at the current collector end portion and the upper surface of the boss portion. So that it is inserted in the press-fitted state. A sealing layer for forming a sealing layer that at least liquid-tightly seals between the current collector and the inner peripheral surface of the through hole at an inner peripheral edge of the through hole facing the current collector. A sealant storage part for storing a stopper is formed.

  In another aspect of the present invention, a cylindrical battery can with a bottom, an annular positive electrode mixture, a cylindrical separator with a bottom disposed inside the positive electrode mixture, and an inner side of the separator. The negative electrode gel to be disposed is housed, and a negative electrode terminal plate is fitted to the opening of the battery can via a sealing gasket, and the sealing gasket is a resin integrally formed in a substantially disc shape. A rod-shaped member having a boss projecting in the shape of a hollow cylinder in the vertical direction at the center of the disk, and fixed to the negative electrode terminal plate in a through hole of the boss of the sealing gasket Current collector is inserted in a press-fit state so that a head surface formed as an enlarged diameter portion at the current collector end portion and an upper surface of the boss portion are in close contact with each other, provided on the boss portion Inner peripheral edge of the through hole facing the current collector A cylindrical battery in which a sealing agent storage part for storing a sealing agent for forming a sealing layer for sealing at least liquid tightly between the current collector and the inner peripheral surface of the through hole is formed. In the manufacturing method, when the current collector is inserted into the boss portion, the sealant is annularly formed in at least a part of a region between the head portion of the current collector outer peripheral portion and the upper surface of the boss portion. After coating, the upper surface of the boss part is temporarily brought into pressure contact with the head surface, and the sealant is supplied between the outer peripheral surface of the current collector and the inner peripheral surface of the through hole of the boss part. Including a process.

  According to one embodiment of the present invention, liquid leakage can be more effectively prevented in a cylindrical battery.

FIG. 1 is a partially enlarged cross-sectional view illustrating the configuration of an engaging portion between a current collector 51 and a sealing gasket boss portion 71 of a cylindrical alkaline battery according to an embodiment of the invention. FIG. 2A is a schematic diagram illustrating a procedure for assembling a cylindrical alkaline battery having the configuration illustrated in FIG. 1. FIG. 2B is a schematic diagram illustrating an assembly procedure of the cylindrical alkaline battery having the configuration illustrated in FIG. 1. FIG. 2C is a schematic diagram illustrating an assembling procedure of the cylindrical alkaline battery having the configuration illustrated in FIG. FIG. 3A is a partial enlarged cross-sectional view illustrating a configuration example of an engaging portion between the current collector 51 and the sealing gasket boss portion 71 of the cylindrical alkaline battery illustrated in FIG. 1 according to another embodiment of the present invention. FIG. 3B is a partially enlarged cross-sectional view illustrating a configuration example of an engaging portion between the current collector 51 and the sealing gasket boss portion 71 of the cylindrical alkaline battery illustrated in FIG. 1 according to another embodiment of the present invention. FIG. 3C is a partial enlarged cross-sectional view illustrating a configuration example of an engaging portion between the current collector 51 and the sealing gasket boss portion 71 of the cylindrical alkaline battery illustrated in FIG. 1 according to another embodiment of the present invention. FIG. 4 is a schematic diagram showing an example of the overall configuration of a cylindrical alkaline battery according to an embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described more specifically with reference to the accompanying drawings. Note that the present invention is not limited to these embodiments.

  First, FIG. 4 shows a longitudinal sectional view showing a configuration example of the cylindrical alkaline battery 1 according to the present embodiment. The alkaline battery 1 is an LR6 type (AA) battery.

  As shown in FIG. 4, the alkaline battery 1 includes a bottomed cylindrical positive electrode can 10 (battery can), a ring-shaped positive electrode mixture 20 fitted along the inner surface of the positive electrode can 10, a positive electrode The bottomed cylindrical separator 30 inserted inside the mixture 20, the gelled negative electrode mixture 40 disposed in the hollow portion of the separator 30 that is the center of the positive electrode can 10, and the opening 10 a of the positive electrode can 10. And a sealing body 50 to be attached.

  The positive electrode can 10 is formed, for example, by press-molding a nickel-plated steel plate into a bottomed cylindrical shape, and a positive electrode terminal 12 projects from the center of the bottom. The positive electrode mixture 20 is produced, for example, by adjusting the positive electrode mixture powder in which electrolytic manganese dioxide, graphite, potassium hydroxide, and a binder are mixed, and then press-molding the powder into a cylindrical shape.

  The separator 30 is an insulating material that electrically separates between the positive electrode mixture 20 and the gelled negative electrode mixture 40, and separator base paper such as vinylon / rayon nonwoven fabric or polyolefin / rayon nonwoven fabric is wound in a cylindrical shape and overlapped. It is produced by thermally fusing the part.

  The gelled negative electrode mixture 40 is prepared by mixing water, zinc oxide and potassium hydroxide and dissolving them, and mixing a gelling agent such as polyacrylic acid and zinc powder.

  The sealing body 50 includes a negative electrode terminal plate 60, a negative electrode current collector 51 (hereinafter “current collector 51”), and a sealing gasket 70. In the vicinity of the opening 10 a of the positive electrode can 10, a bead portion 11 for placing the sealing body 50 is formed. The positive electrode can 10 is sealed by curling and drawing the opening 10 a of the positive electrode can 10 with the sealing body 50 placed on the bead portion 11. In other words, the positive electrode can 10 of the alkaline battery 1 is sealed by shrinking and crimping the opening 10a in the radial direction (transverse direction).

  The sealing body 50 includes a current collector 51 having a body portion (indicated by reference numeral 51b in FIG. 1 and the like described later) formed in a rod shape using brass, and a head portion on the base end side (FIG. 1 and the like described later). In FIG. 5, resistance welding is performed on the back surface of the negative electrode terminal plate 60, and a sealing gasket 70 is fitted to a neck portion that is a connection portion between the head portion 51 a and the body portion 51 b of the current collector 51. ing. The front end side of the current collector 51 is inserted into the gelled negative electrode mixture 40.

  The negative electrode terminal plate 60 is produced by press-molding a nickel-plated steel plate in the same manner as the positive electrode can 10, and seals the opening 10 a of the positive electrode can 10 through a sealing gasket 70. The negative electrode terminal plate 60 is formed in a circular dish shape, and the outer edge portion 60a is bent substantially at a right angle. A plurality of gas vent holes 61 are provided in the outer peripheral collar portion of the negative electrode terminal plate 60.

  The sealing gasket 70 is a resin molded product that is injection-molded using a resin material. As a material for forming the sealing gasket 70, polyamide resins such as 6,12 nylon resin, 6,10 nylon resin, and 6,6 nylon resin are preferably used. The sealing gasket 70 includes a cylindrical boss portion 71 disposed in the center portion and an annular disk portion 72 provided so as to expand radially outward from the boss portion 71. A through hole is provided at the center of the boss 71, and the current collector 51 is inserted in an interference fit state. When a gas is generated due to an electrode short-circuit or the like and the pressure inside the alkaline battery 1 is increased, the sealing gasket 70 is, for example, near a predetermined pressure value set in advance at a thin connection portion between the disk portion 72 and the boss portion 71. It is configured to break. As a result, the increased battery internal pressure is reduced by releasing the generated gas to the outside air through the gas vent hole 61 of the negative electrode terminal plate 60 from the fractured portion, and the alkaline battery 1 is prevented from bursting.

  Next, on the premise of the overall configuration example of the cylindrical alkaline battery 1 described above, a portion related to the present invention of the cylindrical alkaline battery 1 according to one embodiment of the present invention will be described. FIG. 1 is a partial enlarged cross-sectional view illustrating the configuration of the engaging portion between the current collector 51 and the sealing gasket boss portion 71 of the cylindrical alkaline battery 1 according to the embodiment of the invention. In FIG. 1, the same components as those illustrated in FIG. 4 are denoted by the same reference numerals, and detailed description thereof is omitted. This is the same in the following specification.

  The partial enlarged cross-sectional view illustrated in FIG. 1 illustrates the assembly relationship between the current collector 51 and the sealing gasket 70 of the cylindrical alkaline battery 1 according to the embodiment of the present invention. As described above, the current collector 51 has a rod-like body 51b having a circular cross section, a diameter larger than that of the body 51b, and is formed integrally with one end of the body 51b. And a thick disk-shaped head 51a. The sealing gasket 70 has a substantially cylindrical boss portion 71 provided with a through-hole, and the current collector 51 is inserted into the boss portion 71 so that the head portion 51 a is in contact with the upper surface 72 of the boss portion 71. ing.

  The diameter of the body part 51b of the current collector 51 is larger than the inner diameter of the through hole defined by the inner peripheral surface 74 of the boss part 71, and the body part 51b is press-fitted into the through hole of the boss part 71 and is an interference fit. It is set to be the relationship. This is because a gap is generated at the boundary surface between the inner peripheral surface 74 of the boss portion 71 and the body portion 51b of the current collector 51, and the gelled negative electrode mixture 40 sealed by the sealing gasket 70 is exposed to the outside through the boundary surface. This is to prevent leakage. In the present embodiment, a sealing layer for sealing the boundary surface at least in a liquid-tight manner is formed. The sealing layer is formed by a sealing agent interposed on the boundary surface.

  A specific configuration example for forming the sealing layer will be described below. As illustrated in FIG. 1, an R portion that protrudes inward of the through hole is provided on the inner peripheral end peripheral portion (opening peripheral portion) of the through hole on the upper surface 72 side of the boss portion 71. The dimension of the R portion is set so that the head 51 a of the current collector 51 can be in close contact with the upper surface 72 of the boss portion 71. In that case, when the body portion 51b of the current collector 51 is inserted into the through hole of the boss portion 71 so that the upper surface 72 of the boss portion 71 is in close contact with the surface of the head portion 51a of the current collector 51, the R portion is formed. Therefore, a substantially annular space 73 defined by the inner peripheral edge of the through hole of the boss 71, the surface of the head 51 a of the current collector 51, and the outer peripheral surface of the body 51 b of the current collector 51 is defined. Is done. In this embodiment, this space 73 is used to press-fit a sealing agent into the boundary surface between the inner peripheral surface 74 of the boss portion 71 and the body portion 51b of the current collector 51 to form an appropriate sealing layer. Yes. Hereinafter, this space 73 is referred to as “sealing agent reservoir 73”.

  Next, an example of an assembly procedure employed for forming the sealing layer in the cylindrical alkaline battery 1 having the above-described configuration will be described. FIG. 2A to FIG. 2C schematically show an assembly procedure example related to the formation of the sealing layer. As shown in FIG. 2A, the sealant S is applied so that the head 51 a substantially goes around the body 51 b of the current collector 51 fixed to the negative electrode terminal plate 60. It is appropriate that the portion where the sealing agent S is applied is within the range of the length of the boss portion 71 of the sealing gasket 70 from the head 51a of the current collector 51 toward the tip of the body 51b. This is because a sealing layer is formed between the inner peripheral surface 74 of the boss 71 and the body 51 b of the current collector 51. The amount of the sealing agent S applied to the trunk portion 51 b is that of the sealing layer to be formed between the volume of the sealing agent storage portion 73 and the inner peripheral surface 74 of the boss portion 71 and the trunk portion 51 b of the current collector 51. What is necessary is just to set so that the required volume calculated theoretically from thickness and an area may be satisfied. In short, considering the volume of the sealant reservoir 73, the sealant is sufficient to at least liquid-tightly seal between the inner peripheral surface 74 of the boss 71 and the body 51b of the current collector 51. S may be applied, and the application amount of the sealant S and the cross-sectional shape and dimensions of the sealant reservoir 73 can be determined as appropriate based on this technical idea.

  Next, as illustrated in FIG. 2B, the body 51 b of the current collector 51 is inserted into the through hole of the boss 71 from the state of FIG. 2A. Then, as illustrated, the upper surface 72 of the boss 71 is temporarily brought into pressure contact with the surface of the head 51 a of the current collector 51. In other words, after the head portion 51a abuts on the upper surface 72 of the boss portion 71, the head portion 51a further presses and deforms the upper surface 72 of the boss portion 71 to sink by an appropriate depth. At this time, the sealant S applied around the trunk portion 51b of the current collector 51 slides upward while the through hole inner circumferential surface 74 of the boss portion 71 is in close contact with the outer circumferential surface of the trunk portion 51b. In the process, it is accumulated in the sealant reservoir 73. When the head 51 a of the current collector 51 is pushed so as to sink into the upper surface 72 of the boss portion 71, the sealing agent S stored in the sealing agent storage portion 73 is in the through hole of the boss portion 71. A sealing layer is formed by press-fitting between the peripheral surface 74 and the outer peripheral surface of the body 51 b of the current collector 51. The sealant S in the sealant reservoir 73 spreads outward so as to fill the space between the head 51 a of the current collector 51 and the upper surface 72 of the boss 71.

  Next, as illustrated in FIG. 2C, the boss portion 71 is slightly returned toward the front end of the body portion 51 b of the current collector 51 so that the head portion 51 a of the current collector 51 and the upper surface 72 of the boss portion 71 are substantially in contact with each other. To. According to the above assembly procedure example, the boss portion 71 inner peripheral surface 74 of the sealing gasket 70 and the body 51b outer peripheral surface of the current collector 51, and the head portion 51a of the current collector 51 and the upper surface 72 of the boss portion 71, Is properly sealed so as to be in a liquid-tight state.

  In the above embodiment, the configuration in which the through-hole inwardly protruding R portion is provided on the periphery of the through-hole opening of the boss portion 71 is illustrated, but instead of the inwardly protruding R portion, it is illustrated in FIG. 3A. As shown in FIG. 3B, a configuration in which a counterbore portion having an appropriate size is provided in the through-hole inner through-hole opening periphery (in this case, a sealant reservoir) 73 has a rectangular cross-sectional shape.) Alternatively, the sealant reservoir 73 may be formed by adopting a configuration in which a concave R portion is provided inwardly in the through hole at the periphery of the through hole opening. Also in that case, the shape and dimensions can be determined so that the sealant reservoir 73 has an appropriate volume in accordance with the above technical idea. Moreover, it is also free to process the through-hole opening periphery of the boss | hub part 71 in appropriate shapes other than the above.

Next, in the LR6 type (AA) cylindrical alkaline battery 1 according to this embodiment, a sealing layer is formed when a convex R portion is provided inward of the through hole of the boss portion 71 illustrated in FIG. About the effect, the result of having tested by changing the dimension of R part is demonstrated. As shown in Table 1, by changing the radius R of the R portion from 0.1 mm to 0.9 mm at a pitch of 0.1 mm, the body portion 51b of the current collector 51 and the through hole inner peripheral surface 74 of the boss portion 71 The application state of the sealing agent S on the boundary surface was examined. As a method of investigation, after assembling the boss part 71 of the sealing gasket 70 and the current collector 51 of the sealing body 50 in the above-described procedure, the boss part 71 is opened and the sealing agent application state on the boundary surface is examined. did. In Table 1, the cross-sectional area is the cross-sectional area of the shaded portion in FIG. 1 with respect to the corresponding R value, and the boss portion upper surface through-hole opening diameter (symbol φ _{2 in} FIG. 1) is the upper surface 72 of the boss portion 71. In other words, the diameter of the circle drawn by the boundary point at which the transition starts from the flat surface to the curved surface on the through hole side on the upper surface 72 is shown, and the corresponding R value increases as well. In the LR6 type (AA) cylindrical alkaline battery used in the test, the diameter of the body 51b of the current collector 51 is 1.3 mm, and the diameter of the head 51a (reference numeral φ _{1 in} FIG. ₁ ) is 2.8 mm. It is.

  As shown in Table 1, when the value of R is in the range of 0.2 mm to 0.7 mm, the boundary surface between the inner peripheral surface 74 of the boss portion 71 of the sealing gasket 70 and the outer peripheral surface of the trunk portion 51b of the current collector 51 is adequate. It was found that the sealant S was applied and an appropriate sealing state was obtained. On the other hand, when the value of R was 0.1 mm, the state of application of the sealant on the boundary surface was not appropriate, but this was because the value of R was too small and the volume of the sealant reservoir 73 was appropriate. It was thought that the reason was that sufficient sealant S could not be supplied to the boundary surface because it could not be secured. In addition, when the value of R was 0.8 mm and 0.9 mm, it was determined that the sealing agent application state on the boundary surface was not appropriate. As apparent from FIG. 4, the value of R is too large, the opening diameter becomes larger than the diameter of the head 51a of the current collector 51, and the sealant S leaks from the gap between the head 51a and the boss portion upper surface 72. This is thought to be the cause.

  Next, in the same LR6 type (AA) cylindrical alkaline battery 1 as in Table 1, a sealing layer is formed when a chamfered portion is provided inside the through hole of the boss portion 71 illustrated in FIG. 3A. About the effect, the result of having tested by changing the chamfer dimension will be described. As shown in Table 2, the chamfer dimension C is changed from 0.1 mm to 0.9 mm at a pitch of 0.1 mm, and the boundary surface between the body 51b of the current collector 51 and the inner peripheral surface 74 of the through hole of the boss 71 The application state of the sealing agent S was examined. The investigation method is the same as in Table 1. In Table 2, the cross-sectional area is the same as in Table 1, but the boss portion upper surface through-hole opening diameter is changed from the opening diameter on the upper surface 72 of the boss portion 71, in other words, from the flat surface to the slope of the chamfered portion on the upper surface 72. The diameter of the circle drawn by the starting boundary point is shown, and the corresponding C value increases as the corresponding C value increases.

  As shown in Table 2, the test results have the same tendency as in Table 1. When the value of C is in the range of 0.2 mm to 0.7 mm, the inner peripheral surface 74 of the boss portion 71 of the sealing gasket 70 and the current collector 51. It was found that the boundary surface with the outer peripheral surface of the body portion 51b was in a state where the sealant S was appropriately applied, and an appropriate sealing state was obtained. On the other hand, when the value of C was 0.1 mm, the state of application of the sealant on the boundary surface was not appropriate, but this was because the value of C was too small and the volume of the sealant reservoir 73 was appropriate. It was thought that the reason was that sufficient sealant S could not be supplied to the boundary surface because it could not be secured. In addition, when the value of C was 0.8 mm and 0.9 mm, it was determined that the state of application of the sealant on the boundary surface was not appropriate. As apparent from FIG. 4, the value of C is too large, the opening diameter becomes larger than the diameter of the current collector head 51a, and the sealing agent S leaks from the gap between the head 51a and the boss portion upper surface 72. Possible cause.

  In addition, even in the case of a cylindrical battery having a configuration in which the cross-sectional shape of the sealant reservoir 73 is different as illustrated in FIGS. 3B and 3C, the conditions of the cross-sectional area agree with the results in Tables 1 and 2. Thus, the same effect can be acquired by determining a cross-sectional shape and a dimension.

  As described above in detail, according to the cylindrical alkaline battery 1 according to the embodiment of the present invention, the sealing formed by the sealing agent S between the current collector 51 and the boss portion 72 of the sealing gasket 70. It becomes possible to seal appropriately with the layer, and it is possible to effectively prevent battery leakage.

  The embodiment of the present invention has been described by taking the LR6 type (AA) cylindrical (cylindrical) alkaline battery 1 as an example, but the present invention can be applied to a battery of a type other than the alkaline battery as appropriate. it can. In addition, the capacity type of the battery to be applied may be other than the LR6 type (AA type). In that case, the cross-sectional shape and dimensions of the sealant reservoir 73 are appropriately changed in accordance with the dimensions of the current collector 51. In this case, the same effect can be obtained.

DESCRIPTION OF SYMBOLS 1 Cylindrical alkaline battery 10 Positive electrode can 10a Opening part 20 Positive electrode mixture 30 Separator 40 Gel-like negative electrode mixture 50 Sealing body 51 Negative electrode current collection 51a Head part 51b Trunk part 60 Negative electrode terminal board 70 Sealing gasket 71 Boss part 72 Disk part 73 Sealant storage part 74 Boss part inner peripheral surface

Claims (3)

An annular positive electrode mixture, a bottomed cylindrical separator disposed inside the positive electrode mixture, and a negative electrode gel disposed inside the separator are housed in a bottomed cylindrical battery can. And a negative battery terminal plate fitted into the opening of the battery can via a sealing gasket,
The sealing gasket is made of a resin integrally formed in a substantially disc shape, and has a boss portion protruding in a hollow cylindrical shape in the vertical direction at the center of the disc,
A rod-shaped current collector fixed to the negative electrode terminal plate in a through hole of the sealing gasket has a head surface formed as an enlarged diameter portion at the current collecting end portion and the boss portion. It is inserted in a press-fit state so that the top surface is in close contact,
A sealing layer that at least liquid-tightly seals between the current collector and the inner peripheral surface of the through hole is provided on an inner peripheral edge of the through hole provided in the boss portion that faces the current collector. A sealant reservoir for storing a sealant for forming is formed,
A cylindrical battery characterized by that.   The sealant storage part is formed as a substantially annular space defined by the inner peripheral edge of the through hole of the boss part, the head surface, and the outer peripheral surface of the current collector. The cylindrical battery according to claim 1. An annular positive electrode mixture, a bottomed cylindrical separator disposed inside the positive electrode mixture, and a negative electrode gel disposed inside the separator are housed in a bottomed cylindrical battery can. And a negative electrode terminal plate is fitted to the opening of the battery can via a sealing gasket,
The sealing gasket is made of a resin integrally formed in a substantially disc shape, and has a boss portion protruding in a hollow cylindrical shape in the vertical direction at the center of the disc,
A rod-shaped current collector fixed to the negative electrode terminal plate in a through hole of the sealing gasket has a head surface formed as an enlarged diameter portion at the current collecting end portion and the boss portion. It is inserted in a press-fit state so that the top surface is in close contact,
A sealing layer that at least liquid-tightly seals between the current collector and the inner peripheral surface of the through hole is provided on an inner peripheral edge of the through hole provided in the boss portion that faces the current collector. A method for manufacturing a cylindrical battery in which a sealant reservoir for storing a sealant for forming is formed,
When the current collector is inserted into the boss portion, the sealant is annularly applied to at least a part of a region between the head portion of the current collector outer peripheral portion and the upper surface of the boss portion, and then the boss Including a step of temporarily pressing a part upper surface against the head surface and supplying the sealant between the current collecting outer peripheral surface and the through hole inner peripheral surface of the boss portion;
A method of manufacturing a cylindrical battery.

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