JP2011204623A - Sealed battery - Google Patents

Sealed battery Download PDF

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JP2011204623A
JP2011204623A JP2010073322A JP2010073322A JP2011204623A JP 2011204623 A JP2011204623 A JP 2011204623A JP 2010073322 A JP2010073322 A JP 2010073322A JP 2010073322 A JP2010073322 A JP 2010073322A JP 2011204623 A JP2011204623 A JP 2011204623A
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vent
cleavage
battery
gasket
blocking
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JP2010073322A
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Osamu Watanabe
修 渡辺
Mitsuru Morimoto
充 森本
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Hitachi Maxell Energy Ltd
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Hitachi Maxell Energy Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain a structure capable of preventing an interception member from coming off, in a sealed battery where a cleavage member is fixed by caulking to an open end of a bottomed-cylinder-shaped outer packaging can and the interception member is fitted to the cleavage member.SOLUTION: The sealed battery (1) includes: a cleavage vent (22); a gasket (30); an interception vent (25) having a shape of a bottomed cylinder; and a holding member (24) for engaging the interception vent (25) with the cleavage vent (22). The gasket (30) has: a seal portion (a large-diameter portion (33)); and an insulator portion (step portion (31), a small-diameter portion (32)) that extends from the seal portion along the inner surface of a battery can (10) toward the bottom portion of the battery can (10). In the insulator portion, at a position opposite to a peripheral wall portion (25b) of the interception vent (25), a taper portion (34) is formed such that a surface thereof on the inner side of the battery can is located increasingly closer to the outer side in the diameter direction of the battery can (10) as getting toward the seal portion (33).

Description

本発明は、有底筒状の外装缶の開口側に封口体がかしめ固定された密閉型電池に関する。   The present invention relates to a sealed battery in which a sealing body is caulked and fixed to the opening side of a bottomed cylindrical outer can.

従来より、有底筒状の外装缶と、該外装缶の開口を覆うように配置される開裂部材及び遮断部材と、を備えた密閉型電池が知られている。このような密閉型電池では、一般的に、過充電等によって内部にガスが発生した場合、そのガスの圧力によって開裂部材と遮断部材とが分離することにより、電池内部で電流を遮断するように構成されている。また、前記密閉型電池では、電池内の圧力が所定値に達した場合には、開裂部材が開裂して電池内部のガスを放出することにより、電池内の圧力上昇を防止するように構成されている。   2. Description of the Related Art Conventionally, a sealed battery including a bottomed cylindrical outer can, and a cleaving member and a blocking member arranged so as to cover the opening of the outer can are known. Generally, in such a sealed battery, when gas is generated inside due to overcharge or the like, the cleavage member and the blocking member are separated by the pressure of the gas so that the current is cut off inside the battery. It is configured. Further, the sealed battery is configured to prevent an increase in the pressure in the battery by releasing the gas inside the battery by the cleavage member when the pressure in the battery reaches a predetermined value. ing.

具体的には、例えば特許文献１に開示される密閉型電池では、金属板材からなる安全弁（開裂部材）に金属薄板（遮断部材）を溶接し、電池内部でガスが発生すると、電池内部の圧力によって金属薄板と安全弁との溶接部分が剥離するように構成されている。また、前記特許文献１に開示される密閉型電池では、電池内の圧力が所定値に達すると、安全弁が開裂して、電池内部のガスを放出するように構成されている。   Specifically, for example, in a sealed battery disclosed in Patent Document 1, when a metal thin plate (blocking member) is welded to a safety valve (cleavage member) made of a metal plate material and gas is generated inside the battery, the pressure inside the battery is increased. Thus, the welded portion between the metal thin plate and the safety valve is peeled off. Further, the sealed battery disclosed in Patent Document 1 is configured such that when the pressure in the battery reaches a predetermined value, the safety valve is opened to release the gas inside the battery.

一方、上述のような構成の密閉型電池では、例えば前記特許文献１に開示されるように、安全弁の外周側は外装缶の開口端部にかしめられている。ここで、外装缶の開口端部を多くの部品に対してかしめると、その分、電池内の電解液が漏れ出す経路が増える可能性があるため、外装缶の開口端部にかしめられる部材の数をできるだけ減らすのが好ましい。そのため、例えば前記特許文献１に開示されるように、金属薄板を外装缶の開口端部にかしめるのではなく、該金属薄板を安全弁に取り付ける構成が知られている。   On the other hand, in the sealed battery configured as described above, for example, as disclosed in Patent Document 1, the outer peripheral side of the safety valve is caulked to the opening end of the outer can. Here, if the opening end of the outer can is caulked against many parts, there is a possibility that the path through which the electrolyte in the battery leaks increases, so the member that can be caulked to the opening end of the outer can It is preferable to reduce the number of For this reason, for example, as disclosed in Patent Document 1, a configuration is known in which a thin metal plate is attached to a safety valve, instead of being caulked on the opening end of an outer can.

特開平５−３４３０４３号公報JP-A-5-343043

ところで、上述の特許文献１のような構成では、密閉型電池が落下したときなど、該密閉型電池に大きな衝撃が加わった際に、安全弁（開裂部材）に取り付けられた金属薄板（遮断部材）が脱離する可能性がある。そうすると、密閉型電池に大きな衝撃が加わった場合には、該密閉型電池の内部の圧力が上昇していないにも関わらず、電池内部の電流の流れが遮断されるおそれがある。   By the way, in a structure like the above-mentioned patent document 1, when a big impact is added to this sealed battery, such as when a sealed battery falls, the metal thin plate (blocking member) attached to the safety valve (cleavage member) May be detached. Then, when a large impact is applied to the sealed battery, the current flow inside the battery may be interrupted even though the pressure inside the sealed battery is not increased.

本発明の目的は、有底筒状の外装缶の開口端部に開裂部材がかしめ固定されていて、該開裂部材に遮断部材が取り付けられた密閉型電池において、該遮断部材の落下を抑制可能な構成を得ることにある。   An object of the present invention is to suppress the falling of a blocking member in a sealed battery in which a cleaving member is caulked and fixed to the opening end of a bottomed cylindrical outer can and the blocking member is attached to the cleaving member. It is to obtain a simple configuration.

本発明の一実施形態にかかる密閉型電池は、有底筒状の外装缶と、該外装缶の底部側に向かって突出する開裂部を有し、該外装缶の開口側を覆った状態で該外装缶の開口端部によってかしめられる開裂部材と、該開裂部材と前記外装缶の開口端部との間に挟みこまれるように、該開裂部材とともに該外装缶の開口端部によってかしめられるガスケットと、前記開裂部の突出側を覆うように有底筒状に形成され、該開裂部と電気的に接続される遮断部材と、該遮断部材の側壁を保持しつつ該側壁を前記開裂部に係合させるように、弾性変形可能に構成された係合部材と、を備え、前記ガスケットは、前記開裂部材と前記外装缶の開口端部との間に位置するシール部と、該外装缶の内面に沿って該シール部から前記遮断部材よりも前記外装缶の底部側まで延びる絶縁部と、を有し、該絶縁部には、前記遮断部材の側壁と対向する位置に、前記シール部に向かうほど外装缶内方側の面が前記外装缶の径方向外方に位置するテーパ部が形成されている（第１の構成）。   A sealed battery according to an embodiment of the present invention has a bottomed cylindrical outer can and a cleaving portion that protrudes toward the bottom of the outer can, and covers the opening side of the outer can. A cleaving member caulked by the opening end of the outer can, and a gasket caulked by the opening end of the outer can together with the cleaving member so as to be sandwiched between the cleaving member and the opening end of the outer can And a blocking member that is formed in a bottomed cylinder shape so as to cover the protruding side of the cleavage portion and is electrically connected to the cleavage portion, and holds the sidewall of the blocking member while the sidewall is the cleavage portion. An engaging member configured to be elastically deformable so as to be engaged, and the gasket includes a seal portion positioned between the cleaving member and the opening end of the outer can, and the outer can The bottom of the outer can than the blocking member from the seal portion along the inner surface An insulating portion extending to the side, and in the insulating portion, a surface facing the sealing portion at a position facing the side wall of the blocking member, a surface on the inner side of the outer can toward the outer side in the radial direction of the outer can Is formed (first configuration).

この構成により、外装缶の開口端部を開裂部材及びガスケットにかしめた場合、該外装缶の開口端部と開裂部材との間に位置するガスケットの一部（シール部）が圧縮されて、該ガスケットの外装缶底部側の部分（絶縁部）が外装缶の径方向内方へ移動する。絶縁部には、遮断部材の側壁と対向する位置に、シール部に向かうほど外装缶内方側の面が外装缶の径方向外方に位置するテーパ部が設けられているため、該絶縁部が外装缶の径方向内方へ移動した際に、テーパ部によって係合部材及び遮断部材は開裂部材側へ押し上げられる。これにより、遮断部材が開裂部材から脱離するのを防止できる。   With this configuration, when the opening end of the outer can is caulked to the cleavage member and the gasket, a part of the gasket (sealing portion) located between the opening end of the outer can and the cleavage member is compressed, and the A portion (insulating portion) on the bottom side of the outer can of the gasket moves inward in the radial direction of the outer can. The insulating portion is provided with a tapered portion at a position facing the side wall of the blocking member so that the surface on the inner side of the outer can is positioned radially outward of the outer can as it goes to the seal portion. Is moved inward in the radial direction of the outer can, the engagement member and the blocking member are pushed up toward the cleaving member by the tapered portion. Thereby, it can prevent that the interruption | blocking member detach | leaves from the cleavage member.

前記第１の構成において、前記絶縁部は、前記シール部の外装缶底部側から該外装缶の径方向内方に向かって延びる径方向延伸部と、該径方向延伸部における前記外装缶の径方向内方側から該外装缶の筒軸方向に向かって屈曲して伸びる筒軸方向延伸部と、を有していて、前記径方向延伸部と筒軸方向延伸部との間の屈曲部分には、前記外装缶の開口端部が前記開裂部材及びガスケットにかしめられた状態で該屈曲部分が前記係合部材及び遮断部材に接触しないように、面取り部が形成されているのが好ましい（第２の構成）。   In the first configuration, the insulating portion includes a radially extending portion extending from the bottom of the outer can of the seal portion toward a radially inner side of the outer can, and a diameter of the outer can at the radially extending portion. A cylindrical axial extending portion that bends and extends from the inner side in the direction toward the cylindrical axis of the outer can, and a bent portion between the radial extending portion and the cylindrical axial extending portion. Preferably, the chamfered portion is formed so that the bent portion does not contact the engaging member and the blocking member in a state where the opening end portion of the outer can is crimped to the tearing member and the gasket (first step). 2 configuration).

これにより、外装缶の開口端部を開裂部材及びガスケットにかしめた際に該ガスケットの絶縁部が外装缶の径方向内方へ移動しても、該絶縁部の屈曲部分が係合部材及び遮断部材に当接するのを防止できる。すなわち、絶縁部が外装缶の径方向内方へ移動した際に、該絶縁部の屈曲部分が係合部材や遮断部材に当接する構成の場合、該絶縁部の屈曲部分が係合部材または遮断部材の開裂部材側を該開裂部材から離す方向に押すことになる。しかしながら、上述のように、絶縁部の屈曲部分に面取り部を設けることにより、屈曲部分が係合部材及び遮断部材に当接しないため、該屈曲部分によって係合部材及び遮断部材が開裂部材から脱離する方向に押されるのを防止できる。   As a result, even when the insulating end of the gasket moves inward in the radial direction of the outer can when the opening end of the outer can is crimped to the tearing member and the gasket, the bent portion of the insulating portion is disconnected from the engaging member Contact with the member can be prevented. That is, when the insulating portion moves inward in the radial direction of the outer can, the bent portion of the insulating portion is in contact with the engaging member or the blocking member. The side of the member to be cleaved is pushed away from the cleaving member. However, as described above, by providing the chamfered portion at the bent portion of the insulating portion, the bent portion does not come into contact with the engaging member and the blocking member. Therefore, the engaging member and the blocking member are detached from the cleavage member by the bent portion. It can prevent being pushed in the direction of separating.

前記第１または第２の構成において、前記係合部材は、前記遮断部材の側壁を該側壁の先端側から挟み込む保持部を有していて、該保持部は、前記遮断部材の側壁の外方で且つ該遮断部材の底面側に位置する先端部分が、該遮断部材の側壁の先端よりも底面側に位置しているのが好ましい（第３の構成）。   In the first or second configuration, the engagement member has a holding portion that sandwiches a side wall of the blocking member from a distal end side of the side wall, and the holding portion is located outward of the side wall of the blocking member. And it is preferable that the front-end | tip part located in the bottom face side of this interruption | blocking member is located in the bottom face side rather than the front-end | tip of the side wall of this interruption | blocking member (3rd structure).

こうすることで、外装缶の開口端部を開裂部材及びガスケットにかしめた際に、該ガスケットのテーパ部によって係合部材が押される。テーパ部に押された係合部材は、該テーパ部の面に沿うように変形して、遮断部材を開裂部材側に押し付ける。したがって、上述の構成により、遮断部材を開裂部材側により確実に押し付けることができる。   By doing so, when the opening end of the outer can is caulked to the tearing member and the gasket, the engaging member is pushed by the taper portion of the gasket. The engaging member pushed by the taper portion is deformed along the surface of the taper portion and presses the blocking member against the cleavage member side. Therefore, with the above-described configuration, the blocking member can be surely pressed against the tearing member side.

前記第３の構成において、前記保持部は、前記先端部分が前記遮断部材の側壁から離間しているのが好ましい（第４の構成）。   In the third configuration, it is preferable that the holding portion has the tip portion separated from the side wall of the blocking member (fourth configuration).

こうすることで、外装缶の開口端部を開裂部材及びガスケットにかしめた際に、該ガスケットのテーパ部によって係合部材が押される場合、該係合部材のうち遮断部材から離間した部分が容易に変形して該遮断部材を開裂部材側に押し付ける。したがって、上述の構成により、遮断部材をさらに確実に開裂部材側に押し付けることができる。   By doing so, when the engaging member is pushed by the taper portion of the gasket when the opening end of the outer can is caulked to the tearing member and the gasket, the portion of the engaging member that is separated from the blocking member is easily And the blocking member is pressed against the cleavage member. Therefore, with the above-described configuration, the blocking member can be more reliably pressed against the cleavage member side.

本発明の一実施形態にかかる密閉型電池によれば、ガスケットの絶縁部における遮断部材の側壁と対向する位置に、該ガスケットのシール部に向かうほど外装缶内方側の面が外装缶の径方向外方に位置するテーパ部を設けた。これにより、外装缶の開口端部をガスケット及び開裂部材にかしめた際に、該ガスケットの絶縁部のテーパ部によって遮断部材を開裂部材に押し付けることができる。よって、遮断部材の開裂部材からの脱離を抑制できる。   According to the sealed battery according to the embodiment of the present invention, the surface of the outer casing can be located closer to the sealing section of the gasket at the position facing the side wall of the blocking member in the insulating section of the gasket. The taper part located in the direction outward was provided. Thereby, when the open end of the outer can is caulked to the gasket and the tearing member, the blocking member can be pressed against the tearing member by the tapered portion of the insulating portion of the gasket. Therefore, detachment | leave from the cleavage member of the interruption | blocking member can be suppressed.

また、絶縁部の径方向延伸部と筒軸方向延伸部との間の屈曲部分に、面取り部を設けることにより、該屈曲部分が係合部材に当接して遮断部材が開裂部材から脱離するのを防止できる。   Further, by providing a chamfered portion at the bent portion between the radially extending portion and the cylindrical axial extending portion of the insulating portion, the bent portion comes into contact with the engaging member and the blocking member is detached from the cleavage member. Can be prevented.

さらに、係合部材の保持部のうち、遮断部材の側壁の外方で且つ該遮断部材の底面側の先端部分を、該側壁の先端よりも底面側に延ばすことにより、テーパ部によって遮断部材を開裂部材側により確実に押し付けることができる。特に、前記保持部の先端部分を、遮断部材の側壁から離間させることで、テーパ部によって遮断部材を開裂部材側にさらに確実に押し付けることができる。   Furthermore, by extending the front end portion of the engaging member holding portion outside the side wall of the blocking member and on the bottom surface side of the blocking member to the bottom surface side from the front end of the side wall, the blocking member is moved by the taper portion. It can be reliably pressed by the cleaving member side. In particular, by separating the distal end portion of the holding portion from the side wall of the blocking member, the blocking member can be more reliably pressed against the cleavage member by the tapered portion.

図１は、実施形態１にかかる密閉型電池の封口体の概略構成を示す斜視図である。FIG. 1 is a perspective view illustrating a schematic configuration of a sealing body of a sealed battery according to a first embodiment. 図２は、図１におけるII−II線断面図である。2 is a cross-sectional view taken along line II-II in FIG. 図３は、遮断ベントの底面図である。FIG. 3 is a bottom view of the blocking vent. 図４は、図３におけるIV−IV線断面図である。4 is a cross-sectional view taken along line IV-IV in FIG. 図５は、遮断ベントと開裂ベントとの溶接部分を拡大して示す拡大断面図である。FIG. 5 is an enlarged cross-sectional view showing an enlarged welded portion between the blocking vent and the cleavage vent. 図６は、ガスケットの概略構成を示す断面図である。FIG. 6 is a cross-sectional view showing a schematic configuration of the gasket. 図７は、ガスケットに封口体を組み合わせた状態を示す断面図である。FIG. 7 is a cross-sectional view showing a state in which a sealing body is combined with a gasket. 図８は、電池缶の開口端部を封口体及びガスケットにかしめる際の該ガスケットの状態を示す断面図である。FIG. 8 is a cross-sectional view showing a state of the gasket when the open end of the battery can is caulked to the sealing body and the gasket. 図９は、実施形態２にかかる密閉型電池の図７相当図である。FIG. 9 is a view corresponding to FIG. 7 of the sealed battery according to the second embodiment. 図１０は、実施形態２におけるガスケットの概略構成を示す断面図である。FIG. 10 is a cross-sectional view illustrating a schematic configuration of the gasket according to the second embodiment.

以下、図面を参照し、本発明の実施の形態を詳しく説明する。図中の同一または相当部分については同一の符号を付してその説明は繰り返さない。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals and description thereof will not be repeated.

［実施形態１］
（全体構成）
図１は、本発明の一実施形態である密閉型電池１の概略構成を示す図である。この密閉型電池１は、有底筒状の電池缶１０（外装缶）の開口側に封口体２０が取り付けられたものである。詳しくは、図２に断面で示すように、密閉型電池１は、電池缶１０と、封口体２０と、電池缶１０の開口端部１１ａと封口体２０の外周側との間に配置されるガスケット３０と、電池缶１０及び封口体２０によって形成される空間内に収納される電極体４０とを備えている。電池缶１０と封口体２０との間に形成される空間内には、電極体４０以外に、非水電解液（図示省略）も封入されている。 [Embodiment 1]
(overall structure)
FIG. 1 is a diagram showing a schematic configuration of a sealed battery 1 according to an embodiment of the present invention. The sealed battery 1 has a sealing body 20 attached to the opening side of a bottomed cylindrical battery can 10 (exterior can). Specifically, as shown in a cross-section in FIG. 2, the sealed battery 1 is disposed between the battery can 10, the sealing body 20, the opening end portion 11 a of the battery can 10, and the outer peripheral side of the sealing body 20. A gasket 30 and an electrode body 40 housed in a space formed by the battery can 10 and the sealing body 20 are provided. In the space formed between the battery can 10 and the sealing body 20, in addition to the electrode body 40, a nonaqueous electrolytic solution (not shown) is also enclosed.

電池缶１０は、表面にニッケルメッキが施された鋼板やステンレス鋼などの金属材料からなり、プレス成形によって有底円筒状に形成されている。すなわち、電池缶１０は、円形状の底部（図示省略）と、円筒状の周壁部１１とが一体形成されてなる。この電池缶１０の底部には、電極体４０から延びる負極タブ（図示省略）が接続されている。すなわち、本実施形態において、この電池缶１０は、密閉型電池１の負極端子として機能している。なお、この限りではなく、電池缶１０を正極端子として用いてもよい。   The battery can 10 is made of a metal material such as a steel plate or stainless steel whose surface is nickel-plated, and is formed into a bottomed cylindrical shape by press molding. That is, the battery can 10 is formed by integrally forming a circular bottom portion (not shown) and a cylindrical peripheral wall portion 11. A negative electrode tab (not shown) extending from the electrode body 40 is connected to the bottom of the battery can 10. That is, in the present embodiment, the battery can 10 functions as a negative electrode terminal of the sealed battery 1. Note that the battery can 10 may be used as the positive electrode terminal.

電池缶１０の周壁部１１の開口端部１１ａは、ガスケット３０を介して封口体２０にかしめられている。すなわち、封口体２０及びガスケット３０を電池缶１０の内方に配置した状態で、該電池缶１０の開口端部１１ａは、電池缶内方に向かって折り曲げられている。これにより、電池缶１０の開口側に、封口体２０が固定される。   The opening end portion 11 a of the peripheral wall portion 11 of the battery can 10 is caulked to the sealing body 20 via the gasket 30. That is, in the state where the sealing body 20 and the gasket 30 are disposed inside the battery can 10, the open end 11 a of the battery can 10 is bent toward the inside of the battery can. Thereby, the sealing body 20 is fixed to the opening side of the battery can 10.

封口体２０は、正極端子としての端子板２１と、電池内部の圧力上昇に応じて変形し開裂する開裂ベント２２（開裂部材）と、該開裂ベント２２とともに電流遮断機構として機能する遮断ベント２５（遮断部材）と、を備えている。この実施形態における封口体２０では、端子板２１と開裂ベント２２との間に、温度に応じて抵抗が変化する抵抗板２３が配置されている。なお、本実施形態では、端子板２１は正極端子として機能しているが、電池缶１０が正極端子として機能している場合には、端子板２１は、負極端子として機能する。   The sealing body 20 includes a terminal plate 21 as a positive electrode terminal, a cleavage vent 22 (a cleaving member) that is deformed and cleaved in response to an increase in pressure inside the battery, and an interruption vent 25 (functioning as a current interruption mechanism together with the cleavage vent 22). Shielding member). In the sealing body 20 in this embodiment, a resistance plate 23 whose resistance changes according to temperature is disposed between the terminal plate 21 and the cleavage vent 22. In the present embodiment, the terminal plate 21 functions as a positive electrode terminal. However, when the battery can 10 functions as a positive electrode terminal, the terminal plate 21 functions as a negative electrode terminal.

端子板２１は、圧延鋼板の表面にニッケルメッキが施された材料からなり、外周側に円環状の鍔部２１ａを有する略ハット状に形成されている。すなわち、端子板２１の中央部分には、電池缶１０の外方に向かって有底円筒状に膨出する凸部２１ｂが形成されている。この凸部２１ｂの外周側には、複数のガス排出孔２１ｃが設けられている。本実施形態では、ガス排出孔２１ｃは、図１に示すように、凸部２１ｂの外周側に、周方向に９０度の間隔で合計４箇所に設けられている。   The terminal plate 21 is made of a material in which the surface of a rolled steel plate is nickel-plated, and is formed in a substantially hat shape having an annular flange 21a on the outer peripheral side. That is, a convex portion 21 b that bulges into a bottomed cylindrical shape toward the outside of the battery can 10 is formed at the center portion of the terminal plate 21. A plurality of gas discharge holes 21c are provided on the outer peripheral side of the convex portion 21b. In the present embodiment, as shown in FIG. 1, the gas discharge holes 21c are provided at a total of four locations at intervals of 90 degrees in the circumferential direction on the outer peripheral side of the convex portion 21b.

図２に示すように、開裂ベント２２は、アルミニウム製の部材であり、端子板２１と同様、略ハット状に形成されている。すなわち、開裂ベント２２は、有底円筒状に膨出する開裂部２２ａと、該開裂部２２ａの外周側に位置する鍔部２２ｂと、を有している。開裂ベント２２は、開裂部２２ａが電池缶１０の底部側に向かって膨出するように、端子板２１とは逆ハット状に電池缶１０内に配置されている。   As shown in FIG. 2, the cleavage vent 22 is a member made of aluminum and is formed in a substantially hat shape like the terminal plate 21. That is, the cleavage vent 22 includes a cleavage portion 22a that swells into a bottomed cylindrical shape, and a flange portion 22b that is positioned on the outer peripheral side of the cleavage portion 22a. The cleavage vent 22 is arranged in the battery can 10 in a reverse hat shape with respect to the terminal plate 21 so that the cleavage portion 22a bulges toward the bottom side of the battery can 10.

開裂部２２ａには、中央部分に、該開裂部２２ａの膨出方向に向かって膨出する膨出部２２ｃが形成されている。また、開裂部２２ａの内側の底面には、中央の膨出部２２ｃを囲むように、断面略Ｖ字状の溝部２２ｄが円環状に設けられている。さらに、開裂部２２ａの内側の底面には、円環状の溝部２２ｄから平面視で十字状に延びるように断面略Ｖ字状の溝部２２ｅが４つ設けられている。   In the cleavage portion 22a, a bulging portion 22c that bulges in the bulging direction of the cleavage portion 22a is formed at the center portion. Further, a groove portion 22d having a substantially V-shaped cross section is provided in an annular shape on the inner bottom surface of the cleavage portion 22a so as to surround the central bulge portion 22c. Further, four groove portions 22e having a substantially V-shaped cross section are provided on the bottom surface inside the cleavage portion 22a so as to extend in a cross shape from the annular groove portion 22d in plan view.

このように、開裂ベント２２の開裂部２２ａの底面に溝部２２ｄ，２２ｅを設けることにより、密閉型電池１の内部の圧力が所定の圧力（例えば、内圧が２．５ＭＰａ）まで上昇した際に、該開裂ベント２２が溝部２２ｄ，２２ｅで破断する。これにより、電池缶１０が電池内部の圧力上昇によって破裂するのを防止できる。   Thus, by providing the groove portions 22d and 22e on the bottom surface of the cleavage portion 22a of the cleavage vent 22, when the internal pressure of the sealed battery 1 rises to a predetermined pressure (for example, the internal pressure is 2.5 MPa), The cleavage vent 22 is broken at the groove portions 22d and 22e. Thereby, it can prevent that the battery can 10 bursts by the pressure rise inside a battery.

抵抗板２３は、例えば２枚の金属電極箔によって導電性ポリマーのシートを挟み込んでなるもので、電池内部の温度が上昇すると抵抗が大きくなるように構成されている。抵抗板２３は、端子板２１の鍔部２１ａと開裂ベント２２の鍔部２２ｂとの間に挟み込まれるように円環状に形成されている。これにより、密閉型電池１内の温度が所定値以上になると、抵抗板２３は開裂ベント２２と端子板２１との間で電流が流れるのを抑制する。一方、温度が低下すると、抵抗板２３は、抵抗値が下がって元の導通状態に復帰する。   The resistance plate 23 is formed by, for example, sandwiching a conductive polymer sheet between two metal electrode foils, and is configured so that the resistance increases as the temperature inside the battery rises. The resistance plate 23 is formed in an annular shape so as to be sandwiched between the flange portion 21 a of the terminal plate 21 and the flange portion 22 b of the cleavage vent 22. Thereby, when the temperature in the sealed battery 1 becomes equal to or higher than a predetermined value, the resistance plate 23 suppresses a current from flowing between the cleavage vent 22 and the terminal plate 21. On the other hand, when the temperature decreases, the resistance plate 23 decreases in resistance value and returns to the original conductive state.

端子板２１の鍔部２１ａと開裂ベント２２の鍔部２２ｂとの間に抵抗板２３を挟み込んだ状態で、鍔部２１ａ，２２ｂ及び抵抗板２３には、電池缶１０の周壁部１１の開口端部１１ａがかしめられている。これにより、抵抗板２３を端子板２１と開裂ベント２２との間に保持した状態で、電池缶１０の開口側に固定することができる。   With the resistance plate 23 sandwiched between the flange portion 21 a of the terminal plate 21 and the flange portion 22 b of the cleavage vent 22, the opening portions of the peripheral wall portion 11 of the battery can 10 are sandwiched between the flange portions 21 a and 22 b and the resistance plate 23. The part 11a is caulked. Accordingly, the resistance plate 23 can be fixed to the opening side of the battery can 10 while being held between the terminal plate 21 and the cleavage vent 22.

遮断ベント２５は、アルミニウム製の部材であり、開裂ベント２２の開裂部２２ａを覆うように有底円筒状に形成されている。すなわち、遮断ベント２５は、円形状の底面部２５ａ（底面）と、該底面部２５ａの外周側に形成された周壁部２５ｂ（側壁）とを備えている。周壁部２５ｂの開口端側は、絶縁材料からなる円環状の保持部材２４（係合部材）によって、開裂ベント２２の円筒状の開裂部２２ａに保持されている。   The blocking vent 25 is a member made of aluminum, and is formed in a bottomed cylindrical shape so as to cover the cleavage portion 22a of the cleavage vent 22. That is, the blocking vent 25 includes a circular bottom surface portion 25a (bottom surface) and a peripheral wall portion 25b (side wall) formed on the outer peripheral side of the bottom surface portion 25a. The opening end side of the peripheral wall portion 25b is held by the cylindrical cleaving portion 22a of the cleaving vent 22 by an annular holding member 24 (engaging member) made of an insulating material.

保持部材２４は、ポリブチレンテレフタレート（ＰＢＴ）またはポリプロピレン（ＰＰ）製の部材である。よって、保持部材２４は、開裂ベント２２と遮断ベント２５とを後述する溶接部分５０以外で絶縁することができる。   The holding member 24 is a member made of polybutylene terephthalate (PBT) or polypropylene (PP). Therefore, the holding member 24 can insulate the cleavage vent 22 and the blocking vent 25 except for the welded portion 50 described later.

保持部材２４は、開裂ベント２２の開裂部２２ａに係合するように弾性変形可能に構成されている。すなわち、保持部材２４は、遮断ベント２５の周壁部２５ｂの開口端側を挟み込むように断面略Ｕ字状に形成された円環状の保持部２４ａと、該保持部２４ａの内周側から径方向内方に向かって延びるスペーサ部２４ｂとを備えている。これにより、図２に示すように、保持部２４ａ内に遮断ベント２５の周壁部２５ｂを挟み込んだ状態で、該保持部２４ａの内周側が開裂ベント２２の開裂部２２ａに係合される。また、開裂ベント２２と遮断ベント２５との間には、保持部２４ａ及びスペーサ部２４ｂが挟み込まれるため、該開裂ベント２２と遮断ベント２５とを離間させた状態で配置することができる。   The holding member 24 is configured to be elastically deformable so as to engage with the cleavage portion 22 a of the cleavage vent 22. That is, the holding member 24 includes an annular holding portion 24a formed in a substantially U-shaped cross section so as to sandwich the opening end side of the peripheral wall portion 25b of the blocking vent 25, and a radial direction from the inner peripheral side of the holding portion 24a. And a spacer portion 24b extending inward. As a result, as shown in FIG. 2, the inner peripheral side of the holding portion 24 a is engaged with the cleavage portion 22 a of the cleavage vent 22 with the peripheral wall portion 25 b of the blocking vent 25 sandwiched in the holding portion 24 a. Further, since the holding portion 24a and the spacer portion 24b are sandwiched between the cleavage vent 22 and the cutoff vent 25, the cleavage vent 22 and the cutoff vent 25 can be arranged in a separated state.

保持部２４ａは、遮断ベント２５の周壁部２５ｂを覆うように形成されている。これにより、後述するように、電池缶１０の開口端部１１ａを封口体２０にかしめた際に、ガスケット３０は、電池缶１０の径方向内方へ移動して保持部材２４の保持部２４ａに当接する。なお、本実施形態では、保持部２４ａが遮断ベント２５の周壁部２５ｂを覆うように形成されているが、この限りではなく、保持部２４ａは、遮断ベント２５の周壁部２５ｂの外方に位置する先端部分が、少なくとも該遮断ベント２５の周壁部２５ｂの先端よりも底面部２５ａ側に位置するように形成されていればよい。   The holding part 24 a is formed so as to cover the peripheral wall part 25 b of the blocking vent 25. As a result, as will be described later, when the opening end 11a of the battery can 10 is caulked to the sealing body 20, the gasket 30 moves inward in the radial direction of the battery can 10 and moves to the holding portion 24a of the holding member 24. Abut. In the present embodiment, the holding portion 24a is formed so as to cover the peripheral wall portion 25b of the blocking vent 25. However, the holding portion 24a is not limited to this, and the holding portion 24a is positioned outside the peripheral wall portion 25b of the blocking vent 25. It suffices if the tip portion to be formed is positioned at least on the bottom surface portion 25a side than the tip of the peripheral wall portion 25b of the blocking vent 25.

また、保持部２４ａは、遮断ベント２５の周壁部２５ｂの外方に位置する先端部分が該周壁部２５ｂから離間するように形成されている。これにより、後述するように、電池缶１０の開口端部１１ａを封口体２０にかしめた際に、ガスケット３０が電池缶１０の径方向内方へ移動して保持部２４ａの先端部分に当接すると、ガスケット３０によって該先端部分は容易に変形する。   Further, the holding portion 24a is formed such that a tip portion located outside the peripheral wall portion 25b of the blocking vent 25 is separated from the peripheral wall portion 25b. As a result, as will be described later, when the opening end portion 11a of the battery can 10 is caulked to the sealing body 20, the gasket 30 moves inward in the radial direction of the battery can 10 and comes into contact with the tip portion of the holding portion 24a. Then, the tip portion is easily deformed by the gasket 30.

遮断ベント２５の底面部２５ａには、複数の貫通孔２５ｃが周方向に等間隔で形成されている。これらの貫通孔２５ｃは、電池缶１０内で過充電等によって発生したガスが通過するためのガス通気孔である。これらの貫通孔２５ｃを設けることにより、遮断ベント２５をガスが通過して、開裂ベント２２の開裂部２２ａに圧力が付与される。   A plurality of through holes 25c are formed in the bottom surface portion 25a of the blocking vent 25 at equal intervals in the circumferential direction. These through holes 25c are gas vent holes through which gas generated by overcharging or the like in the battery can 10 passes. By providing these through holes 25 c, gas passes through the blocking vent 25 and pressure is applied to the cleavage portion 22 a of the cleavage vent 22.

図３から図５に示すように、底面部２５ａの底面（外方側の面）の中央部分には、薄肉部２６が設けられている。この薄肉部２６は、底面部２５ａの底面の中央部分を段状に薄くすることにより形成される。薄肉部２６は、平面視で円形状に形成されている。また、薄肉部２６の中央部分には、さらに薄肉に形成された接続部２７が設けられている。この接続部２７は、平面視で円形状に形成されていて、図５に示すように、開裂ベント２２の開裂部２２ａの膨出部２２ｃにＹＡＧレーザー溶接等によって接合される。これにより、接続部２７及び膨出部２２ｃに、溶接部分５０（接合部分）が形成される。   As shown in FIGS. 3 to 5, a thin portion 26 is provided at the center of the bottom surface (outer surface) of the bottom surface portion 25 a. The thin portion 26 is formed by thinning the central portion of the bottom surface of the bottom surface portion 25a in a step shape. The thin portion 26 is formed in a circular shape in plan view. Further, a connection portion 27 formed to be thinner is provided at the central portion of the thin portion 26. The connecting portion 27 is formed in a circular shape in plan view, and is joined to the bulging portion 22c of the cleavage portion 22a of the cleavage vent 22 by YAG laser welding or the like, as shown in FIG. Thereby, the welding part 50 (joining part) is formed in the connection part 27 and the bulging part 22c.

また、遮断ベント２５には、電極体４０から延びる正極タブ４５が接続されている（図２参照）。すなわち、電極体４０、遮断ベント２５及び開裂ベント２２は、電気的に接続されている。   Moreover, the positive electrode tab 45 extended from the electrode body 40 is connected to the interruption | blocking vent 25 (refer FIG. 2). That is, the electrode body 40, the blocking vent 25, and the cleavage vent 22 are electrically connected.

図３に示すように、薄肉部２６には、接続部２７を囲むように、複数（本実施形態では３つ）の貫通穴部２６ａが形成されている。各貫通穴部２６ａは、接続部２７を中心とした円弧状に形成された長穴であり、該接続部２７に対して、遮断ベント２５の径方向の同じ位置に設けられている。さらに、薄肉部２６には、接続部２７を囲んで且つ複数の貫通穴部２６ａを繋ぐように、複数の溝部２６ｂが形成されている。具体的には、各溝部２６ｂは、溝底の幅が開口側の溝幅に比べて小さくなるように断面略Ｖ字状に形成されている。また、各溝部２６ｂは、貫通穴部２６ａにおける遮断ベント２５の径方向内側部分に、溝底が繋がるように形成されている。さらに、各溝部２６ｂは、開口側の溝幅が、貫通穴部２６ａの開口の短手方向の長さよりも小さくなるように形成されている。   As shown in FIG. 3, a plurality of (three in this embodiment) through-hole portions 26 a are formed in the thin portion 26 so as to surround the connection portion 27. Each through-hole portion 26 a is an elongated hole formed in an arc shape with the connection portion 27 as the center, and is provided at the same position in the radial direction of the blocking vent 25 with respect to the connection portion 27. Furthermore, a plurality of groove portions 26b are formed in the thin portion 26 so as to surround the connection portion 27 and connect the plurality of through-hole portions 26a. Specifically, each groove 26b is formed in a substantially V-shaped cross section so that the width of the groove bottom is smaller than the groove width on the opening side. Moreover, each groove part 26b is formed so that a groove bottom may be connected to the radial direction inner side part of the interruption | blocking vent 25 in the through-hole part 26a. Furthermore, each groove part 26b is formed so that the groove width on the opening side is smaller than the length in the short direction of the opening of the through hole part 26a.

このように、複数の貫通穴部２６ａを繋ぐように溝部２６ｂを設けることで、該溝部２６ｂの溝底部分のせん断強度を、開裂ベント２２の膨出部２２ｃと接続部２７との溶接部分５０のせん断強度よりも小さくすることができる。したがって、密閉型電池１内で過充電等によってガスが発生して開裂ベント２２が端子板２１側に変形した場合、開裂ベント２２と溶接された接続部２７が該開裂ベント２２とともに端子板２１側に引っ張られると、遮断ベント２５は、溝部２６ｂで破断する。すなわち、開裂ベント２２と遮断ベント２６との溶接部分５０ではなく、該遮断ベント２６の溝部２６ｂで破断するため、溶接などの接合条件の影響を受けることなく、密閉型電池１の内部の圧力が一定値（例えば、１．４ＭＰａ）に達した際に開裂ベント２２と遮断ベント２５とを分離できる。   In this way, by providing the groove portion 26b so as to connect the plurality of through-hole portions 26a, the shear strength of the groove bottom portion of the groove portion 26b is set to the welded portion 50 between the bulging portion 22c of the cleavage vent 22 and the connection portion 27. It can be made smaller than the shear strength. Therefore, when gas is generated in the sealed battery 1 due to overcharge or the like and the cleavage vent 22 is deformed to the terminal plate 21 side, the connection portion 27 welded to the cleavage vent 22 is connected to the terminal plate 21 side together with the cleavage vent 22. When it is pulled, the blocking vent 25 is broken at the groove 26b. That is, since the fracture is caused not by the welded portion 50 between the cleavage vent 22 and the blocking vent 26 but by the groove portion 26b of the blocking vent 26, the internal pressure of the sealed battery 1 is not affected by the joining conditions such as welding. When reaching a certain value (for example, 1.4 MPa), the cleavage vent 22 and the blocking vent 25 can be separated.

これにより、遮断ベント２６と開裂ベント２２とを電気的に切断することができ、両者間の電流の流れを遮断することができる。したがって、上述の構成により、密閉型電池１内の電流の流れを遮断できる。すなわち、遮断ベント２６及び開裂ベント２２が、電流遮断機構として機能する。   Thereby, the interruption | blocking vent 26 and the cleavage vent 22 can be electrically cut | disconnected, and the electric current flow between both can be interrupted | blocked. Therefore, the current flow in the sealed battery 1 can be interrupted by the above-described configuration. That is, the interruption vent 26 and the cleavage vent 22 function as a current interruption mechanism.

また、上述のような構成を有する遮断ベント２５は、コイニングによって形成される。したがって、金属箔を用いる構成に比べて低コストで遮断ベント２５を形成することができる。ところが、コイニングによって遮断ベント２５を形成すると、薄肉部２６の外周縁部で加工硬化が生じ、応力集中によって破断しやすくなる。そうすると、遮断ベント２５が破断する力にばらつきが生じてしまう。これに対し、上述のような溝部２６ｂを設けることにより、遮断ベント２５を該溝部２６ｂで破断することができる。したがって、上述の構成により、遮断ベント２５をコイニングによって形成した場合でも、電池内部の圧力が一定値に達した際に、溝部２６ｂで開裂ベント２２と遮断ベント２５とを分離することができる。   Further, the blocking vent 25 having the above-described configuration is formed by coining. Therefore, the blocking vent 25 can be formed at a lower cost than the configuration using the metal foil. However, when the blocking vent 25 is formed by coining, work hardening occurs at the outer peripheral edge portion of the thin portion 26, and breakage tends to occur due to stress concentration. If it does so, dispersion | variation will arise in the force which the interruption | blocking vent 25 fractures | ruptures. On the other hand, by providing the groove part 26b as described above, the blocking vent 25 can be broken at the groove part 26b. Therefore, even when the blocking vent 25 is formed by coining, the cleavage vent 22 and the blocking vent 25 can be separated by the groove portion 26b when the internal pressure of the battery reaches a certain value.

さらに、図５に示すように、各溝部２６ｂは、遮断ベント２５の薄肉部２６に開裂ベント２２の膨出部２２ｃが押し当てられた状態で、平面視で（該遮断ベント２５及び開裂ベント２２の積層方向から見て）、膨出部２２ｃの内側に形成されている。   Further, as shown in FIG. 5, each groove portion 26 b is in a plan view (in the state where the bulging portion 22 c of the cleavage vent 22 is pressed against the thin portion 26 of the interruption vent 25). , As viewed from the stacking direction), and is formed inside the bulging portion 22c.

遮断ベント２５の薄肉部２６の接続部２７と開裂ベント２２の膨出部２２ｃとをＹＡＧレーザー溶接等によって接合するためには、該膨出部２２ｃと接続部２７との隙間をできるだけ小さくする必要がある。そのためには、膨出部２２ｃを薄肉部２６に押し付ける必要があるが、平面視で該膨出部２２ｃよりも外側に溝部２６ｂが形成されていると、該溝部２６ｂに応力が集中して該溝部２６ｂで破断する可能性がある。これに対し、上述のような位置に溝部２６ｂを設けることにより、膨出部２２ｃを薄肉部２６に押し付けた場合には、溝部２６ｂに大きな力が加わらないため、該溝部２６ｂで破断するのを防止できる。   In order to join the connecting portion 27 of the thin portion 26 of the blocking vent 25 and the bulging portion 22c of the cleavage vent 22 by YAG laser welding or the like, it is necessary to make the gap between the bulging portion 22c and the connecting portion 27 as small as possible. There is. For this purpose, it is necessary to press the bulging portion 22c against the thin-walled portion 26. However, if the groove portion 26b is formed outside the bulging portion 22c in a plan view, stress concentrates on the groove portion 26b and the There is a possibility of breaking at the groove 26b. On the other hand, by providing the groove portion 26b at the position as described above, when the bulging portion 22c is pressed against the thin portion 26, a large force is not applied to the groove portion 26b. Can be prevented.

また、上述のような位置に溝部２６ｂを設けることで、該溝部２６ｂが接続部２７に近くなるため、該溝部２６ｂで破断した場合に、遮断ベント２５のうち開裂ベント２２側に付着する部分を小さくすることができる。これにより、開裂ベント２２側に付着した遮断ベント２５の一部が、該遮断ベント２５の残りの部分に接触して密閉型電池１内で電流が流れ続けるのを防止できる。   Further, by providing the groove 26b at the position as described above, the groove 26b is close to the connecting portion 27. Therefore, when the groove 26b breaks, the portion of the blocking vent 25 that adheres to the cleavage vent 22 side is removed. Can be small. As a result, it is possible to prevent a part of the blocking vent 25 attached to the cleavage vent 22 side from contacting the remaining part of the blocking vent 25 and causing a current to continue flowing in the sealed battery 1.

さらに、上述のような位置に溝部２６ｂを設けることで、溝部を平面視で膨出部２２ｃよりも外側に設けた場合に比べて、小さい力によって遮断ベント２５を溝部２６ｂで破断することができる。すなわち、溝部２６ｂが接続部２７から遠くなると、その分、該溝部２６ｂの距離が長くなって溝底部分のせん断強度も高くなるが、溝部２６ｂを接続部２７のより近くに設けることにより、小さい圧力でも溝部２６ｂで遮断ベント２５をより確実に破断させることができる。   Furthermore, by providing the groove portion 26b at the position as described above, the blocking vent 25 can be broken at the groove portion 26b with a smaller force than when the groove portion is provided outside the bulging portion 22c in plan view. . That is, when the groove portion 26b is far from the connection portion 27, the distance of the groove portion 26b is increased correspondingly, and the shear strength of the groove bottom portion is also increased. However, by providing the groove portion 26b closer to the connection portion 27, it is small. Even with pressure, the blocking vent 25 can be more reliably broken by the groove 26b.

ガスケット３０は、ポリブチレンテレフタレート（ＰＢＴ）またはポリプロピレン（ＰＰ）などからなる概略円筒状の部材である。図６に示すように、ガスケット３０には、一方側の端部の径が他方側の端部の径に比べて大きくなるように、筒軸方向の中央部分に段部３１が設けられている。すなわち、ガスケット３０は、大径部３３と、小径部３２と、それらの間に位置する段部３１と、を有している。大径部３３は、封口体２０を収納可能なように、該封口体２０の外径よりも大きい内径を有する。封口体２０を、ガスケット３０の段部３１で支持するように大径部３３内に収納し、該大径部３３の開口側とともに電池缶１０の周壁部１０の開口端部１０ａを封口体２０にかしめることにより、図２に示すように、ガスケット３０が電池缶１０と封口体２０との間に挟みこまれる。   The gasket 30 is a substantially cylindrical member made of polybutylene terephthalate (PBT) or polypropylene (PP). As shown in FIG. 6, the gasket 30 is provided with a step portion 31 at the center portion in the cylinder axis direction so that the diameter of the end portion on one side is larger than the diameter of the end portion on the other side. . That is, the gasket 30 has a large-diameter portion 33, a small-diameter portion 32, and a step portion 31 positioned therebetween. The large diameter portion 33 has an inner diameter larger than the outer diameter of the sealing body 20 so that the sealing body 20 can be accommodated. The sealing body 20 is accommodated in the large diameter portion 33 so as to be supported by the step portion 31 of the gasket 30, and the opening end 10 a of the peripheral wall portion 10 of the battery can 10 is sealed together with the opening side of the large diameter portion 33. By caulking, the gasket 30 is sandwiched between the battery can 10 and the sealing body 20 as shown in FIG.

ガスケット３０の詳しい構成については後述する。   The detailed configuration of the gasket 30 will be described later.

電極体４０は、特に図示しないが、シート状の正極及び負極がセパレータを介して厚み方向に積層された状態で、渦巻状に捲回されたものである。電極体４０は、正極が正極活物質を有する一方、負極が負極活物質を有し、充放電可能に構成されている。正極、負極及びセパレータの詳しい構成については、従来と同様なので、詳しい説明を省略する。なお、電極体４０の正極は、電池缶１０の開口端部側で、正極タブ４５を介して遮断ベント２５に電気的に接続されている（図２参照）。一方、電極体４０の負極は、電池缶１０の底部側で、図示しない負極タブによって該電池缶１０に電気的に接続されている。   The electrode body 40 is wound in a spiral shape in a state in which a sheet-like positive electrode and a negative electrode are laminated in the thickness direction with a separator interposed therebetween, although not particularly illustrated. In the electrode body 40, the positive electrode has a positive electrode active material, while the negative electrode has a negative electrode active material, and is configured to be chargeable / dischargeable. Detailed configurations of the positive electrode, the negative electrode, and the separator are the same as those in the related art, and thus detailed description thereof is omitted. The positive electrode of the electrode body 40 is electrically connected to the blocking vent 25 via the positive electrode tab 45 on the opening end side of the battery can 10 (see FIG. 2). On the other hand, the negative electrode of the electrode body 40 is electrically connected to the battery can 10 by a negative electrode tab (not shown) on the bottom side of the battery can 10.

正極に用いられる正極活物質としては、例えば、ＬｉＣｏＯ２などのリチウムコバルト酸化物、ＬｉＭｎ２Ｏ４などのリチウムマンガン酸化物、ＬｉＮｉＯ２などのリチウムニッケル酸化物、二酸化マンガン、五酸化バナジウム、クロム酸化物などの金属酸化物や、二硫化チタン、二硫化モリブデンなどの金属硫化物などが用いられる。 Examples of the positive electrode active material used for the positive electrode include lithium cobalt oxide such as LiCoO 2 , lithium manganese oxide such as LiMn 2 O 4 , lithium nickel oxide such as LiNiO 2 , manganese dioxide, vanadium pentoxide, and chromium oxide. Metal oxides such as materials, and metal sulfides such as titanium disulfide and molybdenum disulfide are used.

一方、負極に用いられる負極活物質としては、リチウムイオンをドープ及び脱ドープすることができるものであればどのような物質でもよい。例えば、負極活物質として、黒鉛、熱分解炭素類、コークス類、ガラス状炭素類、有機高分子化合物の焼成体、メソカーボンマイクロビーズ、炭素繊維、活性炭などの炭素材料、Ｓｉ、Ｓｎ、Ｉｎなどの合金、または、Ｌｉに近い低電圧で充放電できるＳｉ、Ｓｎ、Ｉｎなどの酸化物等を用いるのが好ましい。   On the other hand, the negative electrode active material used for the negative electrode may be any material as long as it can dope and dedope lithium ions. For example, as a negative electrode active material, graphite, pyrolytic carbons, cokes, glassy carbons, organic polymer compound fired bodies, mesocarbon microbeads, carbon fibers, activated carbon and other carbon materials, Si, Sn, In, etc. It is preferable to use an alloy of Si, Sn, In or the like that can be charged and discharged at a low voltage close to Li.

（ガスケット）
以下で、ガスケット３０の構成を、図６から図８を用いて詳細に説明する。 (gasket)
Below, the structure of the gasket 30 is demonstrated in detail using FIGS. 6-8.

上述のとおり、ガスケット３０は、概略円筒状に形成されていて、大径部３３及び小径部３２を有している。この小径部３２の内周側には、図６から図８に示すように、段部３１側に、内周面が該段部３１に向かうほど径方向外方に位置するテーパ部３４が形成されている。また、小径部３２と段部３１との間の屈曲部分の内周側には、Ｒ部３５（面取り部）が形成されている。   As described above, the gasket 30 is formed in a substantially cylindrical shape and has a large diameter portion 33 and a small diameter portion 32. As shown in FIGS. 6 to 8, a tapered portion 34 is formed on the inner peripheral side of the small diameter portion 32 on the step portion 31 side. The taper portion 34 is located radially outward as the inner peripheral surface faces the step portion 31. Has been. An R portion 35 (chamfered portion) is formed on the inner peripheral side of the bent portion between the small diameter portion 32 and the step portion 31.

図７に示すように、ガスケット３０の段部３１上に、封口体２０が位置づけられる。これにより、小径部３２の内側に設けられたテーパ部３４は、遮断ベント２５及び該遮断ベント２５を保持する保持部材２４に対応する位置に位置づけられる。すなわち、テーパ部３４は、ガスケット３０において、図７の状態で遮断ベント２５の周壁部２５ｂ及び保持部材２４の保持部２４ａと対向する位置に形成されている。   As shown in FIG. 7, the sealing body 20 is positioned on the step portion 31 of the gasket 30. Accordingly, the tapered portion 34 provided inside the small diameter portion 32 is positioned at a position corresponding to the blocking vent 25 and the holding member 24 that holds the blocking vent 25. That is, the taper portion 34 is formed in the gasket 30 at a position facing the peripheral wall portion 25b of the blocking vent 25 and the holding portion 24a of the holding member 24 in the state of FIG.

図８に示すように、電池缶１０の周壁部１１の開口端部１１ａを封口体２０にかしめた場合、ガスケット３０の大径部３３は電池缶１０の開口端部１１ａと封口体２０との間に挟みこまれる。小径部３２及び段部３１は、電池缶１１と遮断ベント２５との絶縁部材として機能する。したがって、ガスケット３０の大径部３３が、シール部に対応し、小径部３２及び段部３１が、電池缶１０の内面に沿って筒軸方向に延びて電池缶１１と遮断ベント２５とを絶縁する絶縁部に対応する。よって、小径部３２が絶縁部の筒軸方向延伸部に対応し、段部３１が絶縁部の径方向延伸部に対応する。   As shown in FIG. 8, when the opening end 11 a of the peripheral wall portion 11 of the battery can 10 is caulked to the sealing body 20, the large diameter portion 33 of the gasket 30 is formed between the opening end 11 a of the battery can 10 and the sealing body 20. Sandwiched between them. The small diameter portion 32 and the step portion 31 function as an insulating member between the battery can 11 and the blocking vent 25. Therefore, the large-diameter portion 33 of the gasket 30 corresponds to the seal portion, and the small-diameter portion 32 and the step portion 31 extend in the cylinder axis direction along the inner surface of the battery can 10 to insulate the battery can 11 from the shut-off vent 25. Corresponding to the insulation part to be. Therefore, the small diameter portion 32 corresponds to the extending portion in the cylinder axis direction of the insulating portion, and the step portion 31 corresponds to the radially extending portion of the insulating portion.

図８のように電池缶１０の開口端部１１ａを封口体２０にかしめる場合（白抜き矢印参照）、ガスケット３０の大径部３３が筒軸方向に圧縮される（細矢印参照）ため、該ガスケット３０の段部３１が電池缶１０の径方向内方へ押される（黒塗り矢印参照）。これにより、ガスケット３０の小径部３２も電池缶１０の径方向内方へ押される。したがって、ガスケット３０の小径部３２に形成されたテーパ部３４が、保持部材２４の保持部２４ａの外周側を径方向内方へ押圧する。このテーパ部３４は、段部３１側に向かうほど内周面が電池缶１０の径方向外方に位置するように形成されているため、該テーパ部３４によって、保持部２４ａは電池缶１０の径方向内方且つ開裂ベント２２側へ押し付けられる。これにより、保持部材２４によって保持された遮断ベント２５は、ガスケット３０の小径部３２によって開裂ベント２２側に押し付けられて、該開裂ベント２２からの脱離が防止される。   When the open end 11a of the battery can 10 is caulked to the sealing body 20 as shown in FIG. 8 (see white arrow), the large diameter portion 33 of the gasket 30 is compressed in the cylinder axis direction (see thin arrow). The step portion 31 of the gasket 30 is pushed inward in the radial direction of the battery can 10 (see a black arrow). As a result, the small diameter portion 32 of the gasket 30 is also pushed inward in the radial direction of the battery can 10. Therefore, the taper part 34 formed in the small diameter part 32 of the gasket 30 presses the outer peripheral side of the holding part 24a of the holding member 24 radially inward. The taper portion 34 is formed so that the inner peripheral surface thereof is positioned outward in the radial direction of the battery can 10 toward the step portion 31 side. Therefore, the holding portion 24 a of the battery can 10 is formed by the taper portion 34. It is pressed radially inward and toward the cleavage vent 22 side. As a result, the blocking vent 25 held by the holding member 24 is pressed against the cleavage vent 22 by the small diameter portion 32 of the gasket 30 and is prevented from being detached from the cleavage vent 22.

また、テーパ部３４によって押圧される保持部２４ａは、既述のとおり、遮断ベント２５の周壁部２５ｂを覆っているため、テーパ部３４は保持部材２４の保持部２４ａに当接する。これにより、弾性変形可能な保持部２４ａをテーパ部３４の面に沿わせて変形させることができ、該保持部２４ａによって遮断ベント２５の周壁部２５ｂを開裂ベント２２側により確実に押し付けることができる。   Further, as described above, the holding portion 24 a pressed by the tapered portion 34 covers the peripheral wall portion 25 b of the blocking vent 25, so that the tapered portion 34 abuts on the holding portion 24 a of the holding member 24. Accordingly, the elastically deformable holding portion 24a can be deformed along the surface of the tapered portion 34, and the peripheral wall portion 25b of the blocking vent 25 can be reliably pressed against the cleavage vent 22 side by the holding portion 24a. .

さらに、保持部２４ａは、遮断ベント２５の周壁部２５ｂの外方に位置する先端部分が該周壁部２５ｂから離間しているため、テーパ部３４によって該先端部分を押圧すると、保持部２４ａの先端部分が容易に変形する。よって、テーパ部３４によって変形した保持部２４ａにより、遮断ベント２５の周壁部２５ｂを開裂ベント２２側にさらに確実に押し付けることができる。   Furthermore, the holding portion 24a has a distal end portion located outward of the peripheral wall portion 25b of the blocking vent 25 so as to be separated from the peripheral wall portion 25b. Therefore, when the distal end portion is pressed by the taper portion 34, the distal end of the holding portion 24a The part is easily deformed. Therefore, the holding wall 24a deformed by the tapered portion 34 can more reliably press the peripheral wall portion 25b of the blocking vent 25 toward the cleavage vent 22 side.

また、上述のように、ガスケット３０において、小径部３２と段部３１との間の屈曲部分の内周側にＲ部３５を設けることにより、電池缶１０の開口端部１１ａが封口体２０にかしめられた際に前記屈曲部分が保持部材２４に当接するのを防止できる。前記屈曲部分にＲ部３５を設けない場合には、上述のように電池缶１０の開口端部１１ａが封口体２０にかしめられた際に、保持部材２４の保持部２４ａにガスケット３０の屈曲部分が当接して、該保持部２４ａに開裂ベント２２から離す方向の力が加わる。これに対し、上述のようなＲ部３５を設けることにより、前記屈曲部分が保持部２４ａに当接しないため、該保持部２４ａに開裂ベント２２から分離する方向の力が加わるのを防止できる。   Further, as described above, in the gasket 30, by providing the R portion 35 on the inner peripheral side of the bent portion between the small diameter portion 32 and the step portion 31, the opening end portion 11 a of the battery can 10 is formed in the sealing body 20. It is possible to prevent the bent portion from coming into contact with the holding member 24 when crimped. When the R portion 35 is not provided in the bent portion, the bent portion of the gasket 30 is fixed to the holding portion 24a of the holding member 24 when the opening end portion 11a of the battery can 10 is caulked to the sealing body 20 as described above. And a force in a direction away from the cleavage vent 22 is applied to the holding portion 24a. On the other hand, by providing the R portion 35 as described above, since the bent portion does not contact the holding portion 24a, it is possible to prevent the holding portion 24a from being applied with a force in the direction separating from the cleavage vent 22.

（落下試験）
上述のような構成を有する密閉型電池１において、遮断ベント２５が開裂ベント２２から脱離しにくい構成であることを確認するために、落下試験を行った。落下試験は、コンクリート上に立設されたパイプ内に、該コンクリート面から１．５ｍの高さ位置から密閉型電池１を落下させることにより実施した。密閉型電池１を端子板２１側がコンクリート面に衝突するように落下させた後、その密閉型電池１を電池缶１０の底面側がコンクリート面に衝突するように落下させて、１回の落下回数としてカウントする。そして、遮断ベント２５が開裂ベント２２から脱離して密閉型電池１内で電流の流れが遮断されたかどうかを調べることによって、該遮断ベント２５の脱落の有無を評価した。なお、試験は、本実施形態の構成のものと、ガスケット３０の小径部３２にテーパ部３４を設けていないもの（表１において“対策前”）と、をそれぞれ７個ずつ製作して行った。 (Drop test)
In the sealed battery 1 having the above-described configuration, a drop test was performed in order to confirm that the blocking vent 25 is difficult to be detached from the cleavage vent 22. The drop test was performed by dropping the sealed battery 1 from a height position of 1.5 m from the concrete surface into a pipe standing on the concrete. After the sealed battery 1 is dropped so that the terminal plate 21 side collides with the concrete surface, the sealed battery 1 is dropped so that the bottom surface side of the battery can 10 collides with the concrete surface. Count. Then, whether or not the blocking vent 25 was dropped was evaluated by examining whether or not the blocking vent 25 was detached from the cleavage vent 22 and the current flow was blocked in the sealed battery 1. In addition, the test was performed by manufacturing seven each of the configuration of the present embodiment and the configuration in which the taper portion 34 is not provided in the small diameter portion 32 of the gasket 30 (“before countermeasure” in Table 1). .

試験結果を表１に示す。

Figure 2011204623
The test results are shown in Table 1.
Figure 2011204623

表１に示すように、本実施形態のような構成を適用しないもの（ガスケット３０の小径部３２にテーパ部３４を設けないもの）は、数回で遮断ベント２５が開裂ベント２２から脱離して密閉型電池１内の電流が遮断される。これに対し、本実施形態のような構成を適用することで、２０回落下試験を行っても遮断ベント２５が開裂ベント２２から脱離しない。したがって、本実施形態の構成によって、遮断ベント２５を落下しにくくすることができる。   As shown in Table 1, in the case where the configuration as in the present embodiment is not applied (the taper portion 34 is not provided in the small diameter portion 32 of the gasket 30), the blocking vent 25 is detached from the cleavage vent 22 several times. The current in the sealed battery 1 is cut off. On the other hand, by applying the configuration as in the present embodiment, the blocking vent 25 is not detached from the cleavage vent 22 even if the drop test is performed 20 times. Therefore, the blocking vent 25 can be made difficult to fall by the configuration of the present embodiment.

（実施形態１の効果）
本実施形態では、ガスケット３０の小径部３２における電池缶内方側且つ段部３１側に、該段部３１に向かうほど内周面が径方向外方に位置するようなテーパ部３４を設けた。これにより、電池缶１０の開口端部１１ａを封口体２０に対してかしめた際に、該テーパ部３４によって保持部材２４及び遮断ベント２５を開裂ベント２２に押し付けることができる。したがって、密閉型電池１０に衝撃が加わった場合でも、保持部材２４によって開裂ベント２２に保持される遮断ベント２５が該開裂ベント２２から脱離して落下するのを防止できる。 (Effect of Embodiment 1)
In the present embodiment, a tapered portion 34 is provided on the inner side of the battery can and on the step portion 31 side in the small diameter portion 32 of the gasket 30 such that the inner peripheral surface is positioned radially outward as it goes to the step portion 31. . Thereby, when the open end 11 a of the battery can 10 is caulked against the sealing body 20, the holding member 24 and the blocking vent 25 can be pressed against the cleavage vent 22 by the tapered portion 34. Therefore, even when an impact is applied to the sealed battery 10, it is possible to prevent the blocking vent 25 held by the cleavage vent 22 by the holding member 24 from being detached from the cleavage vent 22 and falling.

また、ガスケット３０の小径部３２と段部３１との間の屈曲部分に、Ｒ部３５を設けたため、電池缶１０の開口端部１１ａを封口体２０に対してかしめた際に前記屈曲部分が保持部材２４に当接するのを防止できる。したがって、前記屈曲部分によって保持部材２４に開裂ベント２２から分離する方向の力が加わるのを防止できる。よって、遮断ベント２５の開裂ベント２２からの脱離をより確実に防止できる。   In addition, since the R portion 35 is provided in the bent portion between the small diameter portion 32 and the step portion 31 of the gasket 30, the bent portion is formed when the opening end portion 11 a of the battery can 10 is caulked against the sealing body 20. Contact with the holding member 24 can be prevented. Therefore, it is possible to prevent the bending member from applying a force in the direction of separating from the cleavage vent 22 to the holding member 24. Therefore, detachment | leave from the cleavage vent 22 of the interruption | blocking vent 25 can be prevented more reliably.

また、保持部材２４の保持部２４ａは、遮断ベント２５の周壁部２５ｂの外側を覆うように設けられているため、テーパ部３４の当接によって該テーパ部３４に沿うように変形して、遮断ベント２５を開裂ベント２２側により確実に押し付けることができる。   Further, since the holding portion 24 a of the holding member 24 is provided so as to cover the outer side of the peripheral wall portion 25 b of the blocking vent 25, the holding portion 24 is deformed along the tapered portion 34 by the contact of the tapered portion 34, and is blocked. The vent 25 can be reliably pressed by the cleavage vent 22 side.

さらに、保持部２４ａは、遮断ベント２５の周壁部２５ｂの外方且つ底部２５ａ側に位置する先端部分が、該周壁部２５ｂから離間しているため、テーパ部３４の当接によって容易に変形する。これにより、テーパ部３４に沿うように容易に変形した保持部２４ａにより、遮断ベント２５を開裂ベント２２側にさらに確実に押し付けることができる。   Further, the holding portion 24a is easily deformed by the contact of the taper portion 34 because the tip portion located on the outer side of the peripheral wall portion 25b of the blocking vent 25 and on the bottom portion 25a side is separated from the peripheral wall portion 25b. . Thereby, the interruption | blocking vent 25 can be further more reliably pressed on the cleavage vent 22 side by the holding | maintenance part 24a which deform | transformed easily along the taper part 34. FIG.

［実施形態２］
図９に、実施形態２にかかる密閉型電池において、ガスケット７０に封口体２０を組み合わせた状態を示す。また、図１０に、ガスケット７０の概略構成を示す。この実施形態２の構成は、ガスケット７０の構成が実施形態１とは異なる。この実施形態２において、実施形態１の構成と同一の部分には同一の符号を付し、以下で異なる部分についてのみ説明する。 [Embodiment 2]
FIG. 9 shows a state in which the sealing body 20 is combined with the gasket 70 in the sealed battery according to the second embodiment. FIG. 10 shows a schematic configuration of the gasket 70. The configuration of the second embodiment is different from the first embodiment in the configuration of the gasket 70. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and only different parts will be described below.

具体的には、図９及び図１０に示すように、実施形態１と同様、概略円筒状のガスケット７０には、小径部７２（絶縁部）と大径部７３と（シール部）の間に段部７１（絶縁部）が設けられている。また、円筒状の小径部７２の内周側には、内周面が段部７１に向かうほど径方向外方に位置するテーパ部７４が形成されている。   Specifically, as shown in FIGS. 9 and 10, as in the first embodiment, the substantially cylindrical gasket 70 has a small diameter portion 72 (insulating portion), a large diameter portion 73, and a seal portion. A step portion 71 (insulating portion) is provided. In addition, a tapered portion 74 is formed on the inner peripheral side of the cylindrical small-diameter portion 72 so as to be positioned radially outward as the inner peripheral surface goes to the stepped portion 71.

そして、小径部７２と段部７１との間の屈曲部分には、テーパ部７４とはテーパ角度が異なる第２テーパ部７５（面取り部）が形成されている。図９及び図１０の例では、第２テーパ部７５は、テーパ部７４よりもテーパ角度が小さくなるように設けられている。この第２テーパ角度７５を設けることにより、実施形態１におけるＲ部３５と同様、電池缶１０の開口端部１１ａが封口体２０にかしめられた際に、ガスケット７０の前記屈曲部分が保持部材２４に当接するのを防止できる。   A second tapered portion 75 (chamfered portion) having a taper angle different from that of the tapered portion 74 is formed at a bent portion between the small diameter portion 72 and the stepped portion 71. In the example of FIGS. 9 and 10, the second taper portion 75 is provided so that the taper angle is smaller than that of the taper portion 74. By providing the second taper angle 75, the bent portion of the gasket 70 is held by the holding member 24 when the opening end portion 11 a of the battery can 10 is caulked to the sealing body 20, similarly to the R portion 35 in the first embodiment. Can be prevented from contacting.

（実施形態２の効果）
本実施形態では、ガスケット７０の小径部７２における電池缶内方側に、段部３１に向かうほど内周面が径方向外方に位置するようなテーパ部７４を設けた。これにより、電池缶１０の開口端部１１ａを封口体２０にかしめた際に、ガスケット７０の段部７１が電池缶１０の径方向内方へ押されるため、該ガスケット７０の小径部７２に設けたテーパ部７４が保持部材２４の保持部２４ａの外周側を径方向内方へ押圧する。したがって、保持部材２４は、テーパ部７４によって、電池缶１０の径方向内方且つ開裂ベント２２側へ押し付けられるため、該保持部材２４が開裂ベント２２から脱離するのを抑制することができる。 (Effect of Embodiment 2)
In the present embodiment, a tapered portion 74 is provided on the inner side of the battery can in the small diameter portion 72 of the gasket 70 such that the inner peripheral surface is positioned radially outward as it goes to the step portion 31. Thereby, when the open end 11a of the battery can 10 is caulked to the sealing body 20, the stepped portion 71 of the gasket 70 is pushed inward in the radial direction of the battery can 10, so that the small diameter portion 72 of the gasket 70 is provided. The tapered portion 74 presses the outer peripheral side of the holding portion 24a of the holding member 24 radially inward. Therefore, since the holding member 24 is pressed radially inward of the battery can 10 and toward the cleavage vent 22 by the tapered portion 74, the holding member 24 can be prevented from being detached from the cleavage vent 22.

また、ガスケット７０の小径部７２と段部７１との間の屈曲部分に、テーパ部７４とはテーパ角度が異なる第２テーパ部７５を設けた。これにより、電池缶１０の開口端部１１ａを封口体２０にかしめた際に、ガスケット７０の前記屈曲部分が保持部材２４を開裂ベント２２から離間させるように押すのを防止できる。   Further, a second taper portion 75 having a taper angle different from that of the taper portion 74 is provided at a bent portion between the small diameter portion 72 and the step portion 71 of the gasket 70. Thereby, when the open end 11a of the battery can 10 is caulked to the sealing body 20, the bent portion of the gasket 70 can be prevented from being pushed so as to separate the holding member 24 from the cleavage vent 22.

しかも、第２テーパ部７５を、テーパ角度がテーパ部７４のテーパ角度よりも小さくなるように形成した。これにより、第２テーパ部７５を設けた場合でも、テーパ部７４を、開裂ベント２２側に保持部材２４を押し付けるようなテーパ角度に形成することができる。よって、テーパ部７４によって、保持部材２４が開裂ベント２２から脱離するのをより確実に抑制することができる。   Moreover, the second taper portion 75 is formed so that the taper angle is smaller than the taper angle of the taper portion 74. Thereby, even when the 2nd taper part 75 is provided, the taper part 74 can be formed in the taper angle which presses the holding member 24 to the cleavage vent 22 side. Therefore, the taper portion 74 can more reliably suppress the holding member 24 from being detached from the cleavage vent 22.

（その他の実施形態）
以上、本発明の実施の形態を説明したが、上述した実施の形態は本発明を実施するための例示に過ぎない。よって、本発明は上述した実施の形態に限定されることなく、その趣旨を逸脱しない範囲内で上述した実施の形態を適宜変形して実施することが可能である。 (Other embodiments)
While the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiment, and can be implemented by appropriately modifying the above-described embodiment without departing from the spirit thereof.

前記各実施形態では、ガスケット３０，７０の小径部３２，７２と段部３１，７１との間の屈曲部分に、Ｒ部３５や第２テーパ部７５を設けている。しかしながら、電池缶１０の開口端部１１ａを封口体２０に対してかしめた際に前記屈曲部分が保持部材２４に当接しない構成であれば、該屈曲部分をどのような構成にしてもよい。また、前記屈曲部分が保持部材２４に当接しなければ、Ｒ部や第２テーパ部を設けなくてもよい。さらに、前記実施形態２では、第２テーパ部７５を、テーパ角度がテーパ部７４のテーパ角度よりも小さくなるように形成しているが、この限りではなく、第２テーパ部７５をテーパ部７４のテーパ角度よりも大きくなるように形成してもよい。   In each of the above embodiments, the R portion 35 and the second taper portion 75 are provided at the bent portion between the small diameter portions 32 and 72 and the step portions 31 and 71 of the gaskets 30 and 70. However, the bent portion may have any configuration as long as the bent portion does not come into contact with the holding member 24 when the opening end portion 11a of the battery can 10 is crimped to the sealing body 20. Further, if the bent portion does not contact the holding member 24, the R portion and the second tapered portion may not be provided. Further, in the second embodiment, the second taper portion 75 is formed so that the taper angle is smaller than the taper angle of the taper portion 74. However, the present invention is not limited to this, and the second taper portion 75 is not limited to the taper portion 74. You may form so that it may become larger than this taper angle.

前記各実施形態では、保持部材２４を、遮断ベント２５とは別部材としている。しかしながら、遮断ベント２５に保持部材をモールド成形してもよい。   In each of the above embodiments, the holding member 24 is a separate member from the blocking vent 25. However, the holding member may be molded on the blocking vent 25.

前記実施形態では、開裂ベント２２と端子板２１との間に抵抗板２３を設けている。しかしながら、抵抗板２３を設けずに、開裂ベント２２と端子板２１とを直接接触させるようにしてもよい。   In the embodiment, the resistance plate 23 is provided between the cleavage vent 22 and the terminal plate 21. However, the cleavage vent 22 and the terminal plate 21 may be brought into direct contact without providing the resistance plate 23.

本発明による密閉型電池は、有底筒状の外装缶の開口側に封口体がかしめ固定された密閉型電池に利用可能である。   The sealed battery according to the present invention can be used for a sealed battery in which a sealing body is caulked and fixed to the opening side of a bottomed cylindrical outer can.

１ 密閉型電池
１０ 電池缶（外装缶）
２０ 封口体
２１ 端子板
２２ 開裂ベント（開裂部材）
２２ａ 開裂部
２２ｂ 鍔部
２２ｃ 膨出部
２４ 保持部材（係合部材）
２４ａ 保持部
２４ｂ スペーサ部
２５ 遮断ベント（遮断部材）
２５ａ 底面部（底面）
２５ｂ 周壁部（側壁）
２５ｃ 貫通孔
３０、７０ ガスケット
３１、７１ 段部（絶縁部）
３２、７２ 小径部（絶縁部）
３３、７３ 大径部（シール部）
３４、７４ テーパ部
３５ Ｒ部（面取り部）
４０ 電極体
７５ 第２テーパ部 1 Sealed battery 10 Battery can (exterior can)
20 Sealing body 21 Terminal board 22 Cleavage vent (cleavage member)
22a cleavage part 22b collar part 22c bulging part 24 holding member (engaging member)
24a Holding portion 24b Spacer portion 25 Blocking vent (blocking member)
25a Bottom (bottom)
25b Perimeter wall (side wall)
25c Through hole 30, 70 Gasket 31, 71 Step part (insulating part)
32, 72 Small diameter part (insulating part)
33, 73 Large diameter part (seal part)
34, 74 Tapered part 35 R part (chamfered part)
40 Electrode body 75 Second taper portion

Claims (4)

有底筒状の外装缶と、
前記外装缶の底部側に向かって突出する開裂部を有し、該外装缶の開口側を覆った状態で該外装缶の開口端部によってかしめられる開裂部材と、
前記開裂部材と前記外装缶の開口端部との間に挟みこまれるように、該開裂部材とともに該外装缶の開口端部によってかしめられるガスケットと、
前記開裂部の突出側を覆うように有底筒状に形成され、該開裂部と電気的に接続される遮断部材と、
前記遮断部材の側壁を保持しつつ該側壁を前記開裂部に係合させるように、弾性変形可能に構成された係合部材と、を備え、
前記ガスケットは、前記開裂部材と前記外装缶の開口端部との間に位置するシール部と、該外装缶の内面に沿って該シール部から前記遮断部材よりも前記外装缶の底部側まで延びる絶縁部と、を有し、
前記絶縁部には、前記遮断部材の側壁と対向する位置に、前記シール部に向かうほど外装缶内方側の面が前記外装缶の径方向外方に位置するテーパ部が形成されている、密閉型電池。 A bottomed cylindrical outer can,
A cleaving member that has a cleaving portion that protrudes toward the bottom side of the outer can, and is caulked by the opening end of the outer can in a state of covering the opening side of the outer can;
A gasket caulked by the opening end of the outer can together with the cleavage member so as to be sandwiched between the opening member and the opening end of the outer can;
A blocking member that is formed in a bottomed cylindrical shape so as to cover the protruding side of the cleavage portion, and is electrically connected to the cleavage portion;
An engagement member configured to be elastically deformable so as to engage the side wall with the cleavage portion while holding the side wall of the blocking member,
The gasket extends from the sealing portion located between the cleaving member and the open end of the outer can and from the seal portion to the bottom side of the outer can along the inner surface of the outer can. An insulation part,
In the insulating portion, a tapered portion is formed at a position facing the side wall of the blocking member, and a surface on the inner side of the outer can is positioned radially outward of the outer can as it goes to the seal portion. Sealed battery. 請求項１に記載の密閉型電池において、
前記絶縁部は、前記シール部の外装缶底部側から該外装缶の径方向内方に向かって延びる径方向延伸部と、該径方向延伸部における前記外装缶の径方向内方側から該外装缶の筒軸方向に向かって屈曲して伸びる筒軸方向延伸部と、を有していて、
前記径方向延伸部と筒軸方向延伸部との間の屈曲部分には、前記外装缶の開口端部が前記開裂部材及びガスケットにかしめられた状態で該屈曲部分が前記係合部材及び遮断部材に接触しないように、面取り部が形成されている、密閉型電池。 The sealed battery according to claim 1,
The insulating portion includes a radially extending portion extending from the bottom of the outer can of the seal portion toward the radially inner side of the outer can, and the outer casing from the radially inner side of the outer can at the radially extending portion. A cylindrical axis extending portion that bends and extends toward the cylindrical axis direction of the can,
In the bent portion between the radially extending portion and the cylindrical extending portion, the bent portion includes the engaging member and the blocking member in a state where the opening end portion of the outer can is caulked by the tearing member and the gasket. A sealed battery in which a chamfered portion is formed so as not to contact the battery. 請求項１または２に記載の密閉型電池において、
前記係合部材は、前記遮断部材の側壁を該側壁の先端側から挟み込む保持部を有していて、
前記保持部は、前記遮断部材の側壁の外方で且つ該遮断部材の底面側に位置する先端部分が、該遮断部材の側壁の先端よりも底面側に位置している、密閉型電池。 The sealed battery according to claim 1 or 2,
The engaging member has a holding portion that sandwiches the side wall of the blocking member from the front end side of the side wall,
The holding part is a sealed battery in which a distal end portion located outside the side wall of the blocking member and located on a bottom surface side of the blocking member is positioned closer to the bottom surface than the tip of the side wall of the blocking member. 請求項３に記載の密閉型電池において、
前記保持部は、前記先端部分が前記遮断部材の側壁から離間している、密閉型電池。
The sealed battery according to claim 3,
The holding portion is a sealed battery in which the tip portion is separated from a side wall of the blocking member.
JP2010073322A 2010-03-26 2010-03-26 Sealed battery Withdrawn JP2011204623A (en)

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US9876206B2 (en) 2014-03-28 2018-01-23 Sanyo Electric Co., Ltd. Cylindrical sealed battery
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