JPH11176396A - Cylindrical battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reusable cylindrical battery with a battery jar easy to assemble and disassemble at a room temperature. SOLUTION: A cylindrical lithium secondary battery has a battery jar 10 provided with sealing plates 3 fixed to the openings at both ends of a cylindrical outer can 2 to store an electrode unit 4 therein containing a separator 42 between a positive electrode 40 and a negative electrode 41. In this case, the sealing plates 3 are fixed to the outer can 2 in a removable manner with a fastening mechanism. The fastening mechanism has a flange 37 formed on the outer periphery of the sealing plate 3 and a flange 21 protruded outward to the opening edge of the outer can 2, both being fastened with a bolt 52 and a nut 53.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical battery in which an electrode unit as a power generator is housed in a cylindrical battery case, and more particularly to a structure of a reusable battery case.

[0002]

2. Description of the Related Art In recent years, there has been a demand for the development of a secondary battery having a high energy density and still being clean, and a lithium secondary battery having a high energy density without containing harmful substances such as cadmium and lead has attracted attention. ing. In particular, as a secondary battery for an electric vehicle, a cylindrical lithium secondary battery having a large capacity is expected to be promising.

As shown in FIG. 6, a conventional cylindrical lithium secondary battery is a disk-shaped metal sealing plate provided at both ends of a cylindrical outer can (7) made of a metal such as aluminum, stainless steel or nickel. (8) is joined by laser welding, beam welding or the like to form an integral battery case (60). The battery case (60)
Inside, an electrode unit (9) as a power generator is housed. The electrode unit (9) includes a positive electrode (90) to which a plurality of positive electrode tabs (93) are connected and a negative electrode (91) to which a plurality of negative electrode tabs (94) are connected, and a separator (92). It is formed by winding in a spiral shape with intervening. On both sealing plates (8) and (8), a pair of positive current collecting terminals (95) and negative current collecting terminals (96) for extracting electric power from the electrode unit (9) to the outside are provided on the sealing plates (8). The tip of the positive electrode tab (93) extending from the positive electrode (90) is connected to the positive electrode current collecting terminal (95), and is attached to the negative electrode extending from the negative electrode (91). The tip of the tab (94) is connected to the negative electrode current collecting terminal (96).
In addition, an insulating packing (99) including a pair of insulating seal members (97) and (98) is attached to a central hole (81) of each sealing plate (8), and each current collecting terminal (95) (96) ) Is screwed with a pair of nuts (100) and (100) from both sides of the sealing plate (8).
By pressing 9) from above and below, the insulation between the sealing plate (8) and the terminals (95) and (96) is maintained, and the liquid tightness of the battery case is maintained.

[0004]

By the way, when a cylindrical lithium secondary battery is mounted as a power source of an electric vehicle,
In order to maintain the traveling distance and output, it is necessary to mount a large number of batteries as an assembled battery. Here, since the battery case (60) has a longer life than the electrode unit (9), it is advantageous to reuse the battery case (60) in terms of cost and resource utilization. However, in the conventional cylindrical lithium secondary battery, since the sealing plates (8) and (8) are fixed to the outer can (7) by welding, the battery case (60) is required to take out the electrode unit (9). ) Had to be cut, and the cutting made it impossible to reuse the battery case (60).

In the conventional cylindrical lithium secondary battery, since the sealing plate (8) is a thin metal plate, the sealing plate (8) is
Beam welding, laser welding, and the like are used for fixing (8) and the outer can (7). However, since the battery case (60) becomes hot due to welding, the separator housed in the battery case (60)
There is a problem that (92) shrinks or melts to cause an internal short circuit. Furthermore, the insulating packing (99) attached to the sealing plate (8) may be similarly deformed due to a rise in temperature during welding.
There is a problem that the sealing property of 9) is deteriorated and the electrolyte in the battery case (60) leaks to the outside. Of course, precise control is required for the welding operation using a beam or a laser, so that the reliability of the welding location becomes a problem.

It is an object of the present invention to provide a cylindrical battery having a battery case which is reusable and can be easily assembled and disassembled at room temperature.

[0007]

A cylindrical battery according to the present invention is provided with a sealing plate (3) at each end opening of a cylindrical outer can (2).
And an electrode unit (4) which is configured by interposing a separator (42) between the positive electrode (40) and the negative electrode (41) and is housed in the container (10). A pair of positive and negative current collecting terminals (45) and (46) electrically connected to the electrode unit (4) and attached to the sealing plates (3) and (3). The sealing plate (3) is fixed by a fastening mechanism for detachably fastening the sealing plate (3) to the outer can (2).

In the cylindrical battery of the present invention, since the sealing plate (3) is detachably fixed to the outer can (2) by the fastening mechanism, the sealing plate (3) and the outer can (2) are cut. The battery case (10) can be disassembled without doing so, so that the battery case (10) can be reused.

Further, no welding is required to fix the sealing plate (3) to the outer can (2), and the fastening operation by the fastening mechanism can be performed at room temperature. Therefore, the outer can (2) is not exposed to high temperature, no internal short circuit occurs due to the thermal deformation of the separator (42), and the liquid tightness due to the thermal deformation of the insulating packing (49) does not occur. No drop occurs. Furthermore, in the cylindrical battery assembling process of the present invention, high reliability can be obtained in the fixing structure by the fastening mechanism without requiring advanced technology such as laser welding. This improves product yield.

Specifically, the fastening mechanism for a cylindrical battery according to the present invention comprises a flange portion formed on an outer peripheral portion of a sealing plate (3).
(37), a flange portion (21) projecting outward from an opening edge of the outer can (2), and a ring-shaped sealing member (58) interposed between the flange portions (21) and (37). And a bolt (52) and a nut (53) for fastening the two flange portions (21) and (37) to each other, and the bolt (52) is connected to the two flange portions (21) and (37) and the sealing member ( 58) and is screwed with the nut (53).

In the above specific configuration, the bolt (52) is inserted into both flange portions (21) (37) and the sealing member (58), and a nut (53) is screwed to the tip end thereof, and tightened. The sealing member (58) can be clamped by the flange portions (21) and (37) to fix the sealing plate (3) to the outer can (2). Also, the sealing plate (3) can be removed from the outer can (2) by loosening the nut (53) and detaching it from the bolt (52). In this way, the battery case (10) is easily disassembled,
Or they can be assembled.

More specifically, the fastening mechanism for a cylindrical battery according to the present invention comprises a flange (37) formed on an outer peripheral portion of a sealing plate (3) and an opening edge of an outer can (2). An outwardly protruding flange portion (21), a ring-shaped sealing member (58) interposed between the two flange portions (21) and (37), and both flange portions (21) and (37)
And a cylindrical mounting jig (54) for connecting the two flanges to each other.
4) While (33) is formed, an inner screw portion (54a) that is screwed with the outer screw portions (24) and (33) is formed on the inner peripheral surface of the mounting jig (54).

In the above specific configuration, the mounting jig (54)
Turn the inner screw (54a) of the mounting jig (54) to the battery case (1
After screwing into the external thread portions (24) and (33) of both flange portions (21) and (37) of (0), the sealing plate (3) is rotated relatively to the outer can (2). The sealing member (58) can be clamped by the flange portions (21) and (37) to fix the sealing plate (3) to the outer can (2). Also, the sealing plate (3) can be removed from the outer can (2) by loosening the nut (57) of the mounting jig (54) and detaching it from the bolt (56). In this way, the battery case (10) can be easily disassembled or assembled.

More specifically, the fastening mechanism for a cylindrical battery according to the present invention comprises an inner screw portion formed on an engagement portion between the sealing plate (3) and the outer can (2) and screwed together, and an outer screw portion. It can be composed of a screw part.

The inner thread portion (31) is formed on the inner peripheral surface of a cylindrical outer peripheral piece (36) protruding from the outer peripheral portion of the sealing plate (3). A sealing plate formed on an outer peripheral surface of a flange portion (21) projecting outward from an opening edge of the outer can (2).
An O-ring (51) is interposed between the facing surfaces of (3) and the outer can (2).

In the above specific configuration, the inner screw portion (31) of the sealing plate (3) is screwed into the outer screw portion (24) of the outer can (2) by rotating the sealing plate (3). The O-ring (51) is pressed between the opposing surfaces of the sealing plate (3) and the outer can (2), and the sealing plate is
(3) can be fixed to the outer can (2). Also, sealing plate
By reversely rotating (3), the inner thread of the sealing plate (3)
The sealing plate (3) can be removed from the outer can (2) by unscrewing the (31) and the external thread portion (24) of the outer can (2).

Further, the inner screw portion may be formed on the inner peripheral surface of the open end of the outer can (2), and the outer screw portion may be formed on the outer peripheral surface of the sealing plate (3).

In the above specific configuration, by rotating the sealing plate (3) and screwing the outer screw portion (33) of the sealing plate (3) into the inner screw portion (22) of the outer can (2), The sealing plate (3) can be fixed to the outer can (2). Further, by reversely rotating the sealing plate (3), the screwing of the outer screw portion (33) of the sealing plate (3) and the inner screw portion (22) of the outer can (2) is released, and the sealing plate (3) is released. 3) can be removed from the outer can (2).

[0019]

According to the cylindrical battery of the present invention, since the sealing plate (3) is detachably fixed to the outer can (2) by the fastening mechanism, the battery case (10) can be reused. It is. or,
Since assembly can be performed at room temperature without using welding, an internal short circuit and leakage of electrolyte due to thermal deformation of the separator (42) and the packing (49) can be prevented.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention applied to a cylindrical lithium secondary battery will be specifically described below with reference to the drawings. First Embodiment (Overall Configuration) As shown in FIGS. 1 (a) and 1 (b), a cylindrical lithium secondary battery (1) of the present embodiment has a disc-shaped outer can (2) at both end openings. Fix the metal sealing plates (3) and (3)
(10) is formed. An electrode unit (4) as a power generator is housed in the battery case (10). The electrode unit
(4) The positive electrode (40) to which a plurality of positive electrode tabs (43) are connected
And a negative electrode (41) to which a plurality of negative electrode tabs (44) are connected,
It is formed by spirally winding with a separator (42) interposed. A power supply unit (4) is provided on both sealing plates (3) and (3).
A pair of positive current collector terminals (4
5) and a negative current collecting terminal (46) are attached through the central holes (34) and (34) formed in the sealing plates (3) and (3), respectively.
The tip of the positive electrode tab (43) extending from (40) is connected to the positive current collector terminal (4
The tip of the negative electrode tab (44) connected to 5) and extending from the negative electrode (41) is connected to the negative electrode current collecting terminal (46). Each sealing plate (3)
An insulating packing (49) including a pair of insulating seal members (47) and (48) is mounted in the central hole (34). Each terminal (45)
A pair of nuts (50) and (50) are screwed from both sides of the sealing plate (3) into (46), and the insulating packing (49) is pressed from above and below,
The insulation between the sealing plate (3) and the current collecting terminals (45) and (46) is maintained, and the liquid tightness of the battery case (10) is maintained.

(Tightening Mechanism) The outer can (2) of the battery case (10) has a cylindrical body (20), and each opening edge of the body (20) has an outward flange (21). Are provided, and a flange portion (37) is formed on the outer peripheral portion of the sealing plate (3). A ring-shaped sealing member (58) made of Teflon is interposed between the two flange portions (21) and (37). Eight circular holes (23) and (35) are opened at equal intervals in both flanges (21) and (37).
A bolt (52) penetrates (35) and a nut (53)
Is screwed. The outer cans (2) and (7) are made of aluminum and have an outer diameter of 70 mm and a height of 40 mm.
The thickness is 0 mm and the thickness is 5 mm. Positive current collecting terminal (45)
(95) is made of aluminum and has a diameter of 10 mm and a length of 30 mm
The negative electrode current collecting terminals 46 and 96 are made of nickel and have a diameter of 10 mm and a length of 30 mm. The positive electrode tabs (43) and (93) are made of aluminum, and the negative electrode tabs (44) and (9)
4) is made of nickel.

(Structure of Electrode Unit) Preparation of Positive Electrode LiCoO ₂ powder as a positive electrode active material and carbon powder as a conductive agent were mixed at a weight ratio of 90: 5 to prepare a positive electrode mixture. Next, polyvinylidene fluoride (PVdF) as a binder is replaced with N-methyl-2-pyrrolidone (N
MP) to prepare an NMP solution. A slurry was prepared by kneading the positive electrode mixture and the NMP solution so that the weight ratio of the positive electrode mixture and PVdF became 95: 5, and this slurry was applied to both sides of an aluminum foil as a positive electrode current collector. After vacuum drying at 2 ° C. for 2 hours, rolling and slitting were performed to obtain a positive electrode (40).

Preparation of Negative Electrode Graphite powder having a particle diameter of 10 μm as a negative electrode active material and PVd
A slurry was prepared by kneading the carbon powder and the NMP solution so that the weight ratio of F was 85:15, and this slurry was applied to both surfaces of a copper foil as a negative electrode current collector.
After vacuum drying at 2 ° C. for 2 hours, rolling and slitting were performed to obtain a negative electrode (41).

Preparation of Electrolyte Solution LiPF ₆ was dissolved at a ratio of 1M in a solvent in which ethylene carbonate and diethylene carbonate were mixed at a volume ratio of 1: 1 to prepare an electrolyte solution.

(Assembly of battery) The lithium secondary battery (1)
Will be described. First, several positive electrode tabs (4
The positive electrode (40) connected to 3) and the negative electrode (41) connected to a plurality of negative electrode tabs (44) are spirally wound with a separator (42) interposed therebetween to form an electrode unit (4). Make it. afterwards,
The tip of the positive electrode tab (43) and the tip of the negative electrode tab (44) of the electrode unit (4) and the base of the positive and negative electrode current collecting terminals (45) and (46) are connected at a voltage of 2 V and a maximum output current of 150 A, Energizing time 2msec
After fixing each other by spot welding according to the conditions of
The electrode unit (4) is housed in the outer can (2). continue,
As shown, the current collecting terminals (45) and (46), the insulating sealing members (47) and (48), and the nuts (50) and (50) are provided in the central holes (34) and (34) of the sealing plates (3) and (3), respectively. Attach 50). However, at this stage the nut
(50) Make the (50) loosened temporarily. Thereafter, the electrolyte is poured into the outer can (2), and the outer can is
Fix both sealing plates (3) and (3) to (2). Finally, the nuts (50) and (50) screwed to the current collecting terminals (45) and (46) are further tightened to seal the battery case (10).

In the above cylindrical lithium secondary battery,
The adoption of a fastening mechanism for fastening the two flange portions (21) and (37) with the bolts (52) and the nuts (53) makes it possible to easily disassemble and assemble the battery case (10).

Second Embodiment (Tightening Mechanism) As shown in FIG. 2, the fastening mechanism employed in this embodiment includes a flange (37) formed on the outer periphery of a sealing plate (3), and an outer can ( The flange portion (21) formed outward on the opening edge of (2) is fastened to each other by a cylindrical Teflon mounting jig (54). Both flanges (21) (37)
A ring-shaped seal member (58) is interposed between them.
An inner screw portion (54a) is formed on the inner peripheral surface of the mounting jig (54),
The inner screw portion (5) is provided on the outer peripheral surface of the two flange portions (21) (37).
Outer thread portions (24) and (33) to be screwed with 4a) are formed. The mounting jig (54) has a half-split structure as shown in FIG.
It can be opened and closed by the hinge (59), and a pair of flanges (55) (55) projecting on the opposite side of the hinge (59) is bolted.
By fixing the battery case (56) with the nut (57), the battery case (10) is fixed to the flange portions (21) and (37).

(Assembly of battery) As in the first embodiment, the electrode unit (4) is housed in the outer can (2), and both sealing plates (3) and (3) are provided.
The current collecting terminals (45) and (46), the insulating seal members (47) and (48), and the nuts (50), (50), (50) and (50) are attached to the central holes (34) and (34), respectively. However, at this stage, the outer nuts (50) and (50) are temporarily loosened. Then, the flange (2
A sealing member (5) is provided between the sealing plate (3) and the flange (37) of the sealing plate (3).
8) With the hinge (59) interposed, the mounting jig (54)
Open and close, attach the mounting jig (54) to both flanges (21) (37), and use the bolt (56) and nut (57) to mount the mounting jig (54).
Is fixed to both flange portions (21) and (37). And the sealing plate
By rotating (3), the sealing member (58) is clamped by the flange portions (21) and (37), and the sealing plate (3) is
Fix to (2). At this time, the current collecting terminals (45) and (46) are
By rotating in the opposite direction to (3), the current collecting tab (4
3) Prevent torsion of (44). Finally, each collecting terminal (45) (46)
Further tighten the nuts (50) and (50) screwed into the
Seal 0).

Incidentally, instead of the fastening mechanism comprising the hinge (59), the bolt (56) and the nut (57) employed in the mounting jig (54) shown in FIG. ), Bolts (56) (56) and nut (57) are attached to both ends of the mounting jig (54) having a half-split structure.
It is also possible to adopt a structure provided with a fastening mechanism consisting of (57).

Third Embodiment (Tightening Mechanism) As shown in FIGS. 4 (a) and 4 (b), the fastening mechanism of this embodiment is a cylindrical outer peripheral piece (3) projecting from the outer peripheral portion of a sealing plate (3).
6) and an external thread (24) formed on a flange (21) projecting outward from an opening edge of the outer can (2). It is something that can be combined. Outer can
Between the flange (21) of (2) and the outer periphery of the sealing plate (3),
An O-ring (51) is interposed.

(Assembly of battery) As in the first embodiment, the electrode unit (4) is housed in the outer can (2), and both sealing plates (3) and (3) are provided.
The current collecting terminals (45) and (46), the insulating seal members (47) and (48), and the nuts (50) and (50) are attached to the center holes (34) and (34), respectively. However, at this stage, the outer nuts (50) and (50) are temporarily loosened. Then, with the O-ring (51) interposed between the flange portion (21) of the outer can (2) and the outer peripheral portion of the sealing plate (3), the inner thread portion (31) of the sealing plate (3) is inserted. Is screwed into the outer screw part (24) of the outer can (2), and the sealing plate (3) is rotated, so that the flange (21) of the outer can (2) and the outer periphery of the sealing plate (3) Press the O-ring (51) and put the sealing plate (3) on the outer can
Fix to (2). At this time, the current collecting terminals (45) and (46) are
By rotating in the opposite direction to (3), the current collecting tab (4
3) Prevent torsion of (44). Finally, each collecting terminal (45) (46)
Further tighten the nuts (50) and (50) screwed into the
Seal 0).

Fourth Embodiment (Overall Structure) As shown in FIGS. 5 (a) and 5 (b), a cylindrical lithium secondary battery (1) according to this embodiment has a center hole formed in both sealing plates (3) and (3). (3
4) (34), the columnar current collecting terminals (45), (46) are inserted, and the inner peripheral surface of the central holes (34), (34) and the outer peripheral surface of the current collecting terminals (45), (46). The gaps between them are filled with sealing resins (38), (38), thereby maintaining the insulation and the liquid tightness of the battery case (10).

(Tightening Mechanism) In the fastening mechanism of this embodiment, as shown in FIGS. 5 (a) and 5 (b), an inner thread portion (22) is provided on the inner peripheral surface of the open end of the outer can (2). On the other hand, an outer thread portion (33) is formed on the outer peripheral surface of the sealing plate (3), and the inner thread portion (22) is formed.
And the external thread portion (33) are screwed together.

(Assembly of battery) As in the first embodiment, an outer can
The electrode unit (4) is housed in (2), and both collector terminals (45) and (46) are inserted through the central holes (34) and (34) of the sealing plates (3) and (3). The external thread (33) of (3) is replaced with the internal thread of the outer can (2)
Screw in (22) and tighten. At this time, the current collecting terminal (45)
By preventing co-rotation of (46), twisting of current collecting tabs (43) and (44) is prevented. Finally, the sealing resin (38) (38) is filled in the gap between the central holes (34) (34) of the sealing plates (3) (3) and the current collecting terminals (45) (46) and cured. Let me know.

The lithium secondary battery of the first embodiment shown in FIG.
(Battery A1 of the present invention) and ten lithium secondary batteries of the second embodiment (Battery A2 of the present invention) shown in FIGS. 2 and 3 were prototyped, and a conventional lithium secondary battery shown in FIG. Ten prototypes of the battery B) were manufactured, and reuse of the battery case (10) was examined.

The batteries A1 and A2 of the present invention and the comparative battery B had an output voltage of 3.6 V and a discharge capacity of 80 Ah. After performing 200 cycles of constant current charging / discharging of 8 A to these batteries, the battery of the present invention is disassembled by disassembling the fastening mechanism, and the comparative battery is cut by cutting the outer can (2) to obtain a battery case ( The electrode unit (4) and the electrolytic solution were taken out from 10). For the batteries A1 and A2 of the present invention, after assembling the batteries again using the fastening mechanism, argon gas was sealed in the battery case (10) and an internal pressure of 10 kg / cm ² was applied. It did not occur and hermeticity was maintained. From this experimental result, it can be said that the lithium secondary battery according to the present invention has no risk of liquid leakage when the battery case (10) is reused.

The batteries A1 and A2 of the present invention and the comparative battery B
The maximum temperature at the time of assembling was measured, and it was examined whether or not the electrode of the disassembled battery was short-circuited due to contraction or dissolution of the separator (42). The results shown in Table 1 were obtained.

[0038]

[Table 1]

As shown in Table 1, the batteries A1 and A2 of the present invention
The defective rate of Comparative Battery B reached 0%, whereas the defective rate of Comparative Battery B reached 30%. This is because, in the battery of the present invention, the assembly was performed at normal temperature by the fastening mechanism, so that the separator (42) was not affected by heat. Rises,
The separator (42) is contracted or dissolved.
Thus, according to the lithium secondary battery of the present invention,
The occurrence of a defect due to an internal short circuit can be avoided.

The configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims. For example, the present invention can be applied to a nickel-metal hydride storage battery other than the lithium secondary battery. Further, the insulating seal members (47) and (48), O-rings (51),
The seal member (58) and the mounting jig (54) can be made of a fluorine resin, polyethylene, or polypropylene other than Teflon. Furthermore, sealing plate (3) and outer can
In the example where (2) is fastened via the sealing member (58), the insulating structure between the sealing plates (3) (3) and the current collecting electrode terminals (45) (46) can be omitted. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view and a plan view showing a first embodiment of a cylindrical lithium secondary battery according to the present invention.

FIG. 2 is a sectional view showing a second embodiment.

FIG. 3 is a plan view showing a second embodiment.

FIG. 4 is a sectional view and a plan view showing a third embodiment.

FIG. 5 is a sectional view and a plan view showing a fourth embodiment.

FIG. 6 is a sectional view and a plan view of a conventional cylindrical lithium secondary battery.

[Explanation of symbols]

 (1) Lithium rechargeable battery (2) Outer can (3) Sealing plate (4) Electrode unit (10) Battery case (20) Body (21) Flange (22) Internal thread (31) Internal thread ( 33) External thread (51) O-ring (54) Mounting jig (58) Seal member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ikuro Yonezu 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Koji Nishio 2-chome, Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd.

Claims (6)

[Claims] 1. A container (10) in which sealing plates (3) and (3) are fixed to both ends of a cylindrical outer can (2), respectively, and between a positive electrode (40) and a negative electrode (41). An electrode unit (4), which is configured with a separator (42) interposed therebetween and housed in the battery case (10); and the sealing plate (3) (3) electrically connected to the electrode unit (4). In a cylindrical battery comprising a pair of positive and negative electrode terminals (45) and (46) attached to each of the above, an outer can (2) and each sealing plate (3)
(3) A cylindrical battery characterized by being fixed by a fastening mechanism for detachably fastening the sealing plates (3) and (3) to the outer can (2). 2. The fastening mechanism includes a flange portion (37) formed on an outer peripheral portion of a sealing plate (3) and a flange portion (21) protruding outward from an opening edge of the outer can (2). And both flanges (21)
(37), a ring-shaped sealing member (58), a bolt (52) and a nut (53) for fastening the flange portions (21) and (37) to each other, and the bolt ( 52) penetrates both flanges (21) (37) and seal member (58) and
The cylindrical battery according to claim 1, which is screwed with (53). The fastening mechanism includes a flange portion (37) formed on an outer peripheral portion of a sealing plate (3) and a flange portion (21) projecting outward from an opening edge of the outer can (2). And both flanges (21)
(37) and a cylindrical mounting jig (54) for connecting the two flanges (21) and (37) to each other. Outer thread portions (24) and (33) are formed on the outer peripheral surface of (21) and (37), while the mounting jig (5
The cylindrical battery according to claim 1, wherein an inner screw portion (54a) that is screwed with the outer screw portions (24) and (33) is formed on the inner peripheral surface of (4). 4. The fastening mechanism comprises a sealing plate (3) and an outer can.
2. The cylindrical battery according to claim 1, comprising an inner thread portion and an outer thread portion which are formed on the engaging portion and which are screwed together. 5. The inner thread portion is formed on an inner peripheral surface of a cylindrical outer peripheral piece (36) protruding from an outer peripheral portion of a sealing plate (3), and the outer thread portion is formed on an outer can (2). Formed on the outer peripheral surface of the flange (21) projecting outward from the opening edge, the sealing plate (3) and the outer can
The O-ring (51) is interposed between the opposing surfaces of (2).
4. The cylindrical battery according to 1. 6. The inner screw part is formed on the inner peripheral surface of the open end of the outer can (2), and the outer screw part is formed on the outer peripheral surface of the sealing plate (3). Cylindrical battery.