JP5756843B2 - Current interrupt device and power storage device using the same - Google Patents

Current interrupt device and power storage device using the same Download PDF

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JP5756843B2
JP5756843B2 JP2013240223A JP2013240223A JP5756843B2 JP 5756843 B2 JP5756843 B2 JP 5756843B2 JP 2013240223 A JP2013240223 A JP 2013240223A JP 2013240223 A JP2013240223 A JP 2013240223A JP 5756843 B2 JP5756843 B2 JP 5756843B2
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energization
plate
space
case
energizing
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JP2015099754A (en
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貴之 弘瀬
貴之 弘瀬
元章 奥田
元章 奥田
寛恭 西原
寛恭 西原
厚志 南形
厚志 南形
俊昭 岩
俊昭 岩
小川　義博
義博 小川
淳 光安
淳 光安
騎慎 秋吉
騎慎 秋吉
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Toyota Industries Corp
Eagle Industry Co Ltd
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Toyota Industries Corp
Eagle Industry Co Ltd
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Priority to JP2013240223A priority Critical patent/JP5756843B2/en
Priority to PCT/JP2014/079740 priority patent/WO2015076138A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Description

本明細書は、電流遮断装置およびそれを用いた蓄電装置に関する技術を開示する。   The present specification discloses a technology related to a current interrupt device and a power storage device using the current interrupt device.

蓄電装置には、蓄電装置が過充電され、あるいは、内部で短絡が発生したときに、ケース内の電極組立体とケースに設けられた外部端子とを接続する通電経路を遮断する電流遮断装置が装備されることがある。特許文献１、２の電流遮断装置は、内部端子板と、内部端子板と対向して配置された導電板を備えている。導電板の外周部は外部端子板に接続され、導電板の中央部は内部端子板の中央部に接続されている。また、内部端子板の外周部は電極組立体に接続されている。ケース内の圧力が上昇すると、導電板と内部端子板とが分離し、導電板と内部端子板との通電が遮断され、電極組立体と外部端子の間を流れる電流が遮断される。   The power storage device includes a current interrupt device that interrupts an energization path that connects the electrode assembly in the case and an external terminal provided in the case when the power storage device is overcharged or a short circuit occurs inside. May be equipped. The current interrupting devices of Patent Literatures 1 and 2 include an internal terminal plate and a conductive plate disposed to face the internal terminal plate. The outer peripheral portion of the conductive plate is connected to the external terminal plate, and the central portion of the conductive plate is connected to the central portion of the internal terminal plate. The outer peripheral portion of the internal terminal plate is connected to the electrode assembly. When the pressure in the case increases, the conductive plate and the internal terminal plate are separated from each other, the conduction between the conductive plate and the internal terminal plate is cut off, and the current flowing between the electrode assembly and the external terminal is cut off.

特開平０８−１８５８４９号公報Japanese Patent Laid-Open No. 08-185849 特開平０８−１１５７１５号公報Japanese Patent Laid-Open No. 08-115715

この種の電流遮断装置では、導電板と内部端子板とが分離したときに、導電板と内部端子板の間に大きな電圧が印加されることがある。かかる場合、導電板と内部端子板とが対向する範囲において、両者の間にケース内の電解液が存在すると、その電解液から導電性異物が生成して液絡し、導電板と内部端子板とが再通電する虞がある。このため従来の電流遮断装置では、ケース内の電解液が導電板と内部端子板との間の隙間に侵入しないように２つのシール部材が設けられ、複雑な構造となっていた。すなわち、導電板と内部端子板の隙間に第１シール部材が設けられると共に、導電板の外周面と内部端子板の外周面に接する第２シール部材が配されていた。本明細書では、２つの通電部材間の液絡の防止を簡易な構造で実現する技術を提供する。   In this type of current interrupting device, when the conductive plate and the internal terminal plate are separated, a large voltage may be applied between the conductive plate and the internal terminal plate. In such a case, in the range where the conductive plate and the internal terminal plate face each other, if there is an electrolytic solution in the case between the two, a conductive foreign matter is generated from the electrolytic solution, resulting in liquid junction, and the conductive plate and the internal terminal plate. May re-energize. For this reason, in the conventional current interruption device, the two sealing members are provided so that the electrolyte in the case does not enter the gap between the conductive plate and the internal terminal plate, resulting in a complicated structure. That is, the first seal member is provided in the gap between the conductive plate and the internal terminal plate, and the second seal member in contact with the outer peripheral surface of the conductive plate and the outer peripheral surface of the internal terminal plate is disposed. The present specification provides a technique for realizing a liquid junction between two current-carrying members with a simple structure.

本明細書が開示する電流遮断装置は、ケースに設けられた外部端子と、ケースに収容される電極組立体とを接続する通電経路を、ケース内の内圧が所定値を超えた時に遮断する。この電流遮断装置は、外部端子と電気的に接続された第１通電部材と、第１通電部材と対向して配置され、電極組立体と電気的に接続された第２通電部材と、第１通電部材と第２通電部材との間に設けられ、第１通電部材と第２通電部材の間の隙間を封止する絶縁性のシール部材と、を備えている。第１通電部材と第２通電部材は、ケース内の圧力が所定値以下の時は互いに通電して通電経路の一部を形成する一方、ケース内の圧力が所定値を超えると互いに離間して通電経路を遮断する。シール部材は第１通電部材の外周縁の近傍に接触する第１接触部と、第２通電部材の外周縁に接触する第２接触部を有しており、第１通電部材と第２通電部材の間の空間を第１接触部および第２接触部より内側の第１空間と外側の第２空間とに隔離する。第２空間はケース内の空間と連通している。第１空間は、シール部材により、ケース内の空間から封止されている。第１通電部材と第２通電部材とシール部材を平面視すると、第１通電部材と第２通電部材が対向する範囲内において、第１接触部および第２接触部より外側の領域全体にシール部材が位置する。さらに第１通電部材と第２通電部材の少なくとも一方は、第１通電部材と第２通電部材の他方と対向する対向面を有すると共に、その対向面とその外周面により形成される角部にテーパが設けられており、シール部材がそのテーパの形成された部分に接触している。ここで、平面視とは、第１通電部材と第２通電部材が互いに対向している面に対して垂直な方向から視ることを意味する。別言すれば、第１通電部材と第２通電部材の位置関係において、第２通電部材に対して第１通電部材が位置する側から視ること、若しくは、第１通電部材に対して第２通電部材が位置する側から視ることを意味する。 The current interrupt device disclosed in the present specification interrupts an energization path connecting an external terminal provided in a case and an electrode assembly accommodated in the case when an internal pressure in the case exceeds a predetermined value. The current interrupting device includes a first current-carrying member electrically connected to the external terminal, a second current-carrying member disposed opposite to the first current-carrying member and electrically connected to the electrode assembly, An insulating seal member that is provided between the energization member and the second energization member and seals a gap between the first energization member and the second energization member. The first energization member and the second energization member are energized to form a part of the energization path when the pressure in the case is below a predetermined value, and separated from each other when the pressure in the case exceeds the predetermined value. Shut off the current path. The seal member has a first contact portion that contacts the vicinity of the outer peripheral edge of the first current-carrying member, and a second contact portion that contacts the outer periphery of the second current-carrying member, and the first current-carrying member and the second current-carrying member The space between is separated into a first space inside the first contact portion and the second contact portion and a second space outside. The second space communicates with the space in the case. The first space is sealed from the space in the case by a seal member. When the first energizing member, the second energizing member, and the seal member are viewed in plan, the seal member covers the entire area outside the first contact portion and the second contact portion within a range where the first energizing member and the second energizing member face each other. Is located. Furthermore, at least one of the first energizing member and the second energizing member has an opposing surface that opposes the other of the first energizing member and the second energizing member, and tapers at a corner formed by the opposing surface and the outer peripheral surface. And the seal member is in contact with the tapered portion. Here, the plan view means that the first energizing member and the second energizing member are viewed from a direction perpendicular to the surfaces facing each other. In other words, in the positional relationship between the first energization member and the second energization member, the second energization member is viewed from the side where the first energization member is located, or the second energization member is second. This means viewing from the side where the energizing member is located.

上記の電流遮断装置では、第１通電部材と第２通電部材の隙間がシール部材によって第１空間と第２空間に隔離され、第２空間がケース内の空間に連通している。このため、第２空間にはケース内の電解液が侵入する可能性がある。しかしながら第２空間では、第１通電部材と第２通電部材とが対向する範囲の全体にシール部材が位置し、第１通電部材と第２通電部材とが、その間に電解液が存在する状態で直接対向することが防止される。これによって、第１通電部材と第２通電部材の液絡が防止される。すなわち、第１通電部材と第２通電部材の間の第２空間に電解液が侵入しても、両者の間にシール部材が適切に配置されているため、両者の液絡を防止することができる。また、この電流遮断装置では、第１通電部材と第２通電部材の間への電解液の侵入が許容されるため、従来技術のように２つのシール部材を用いる必要がなく、簡易な構造で液絡を防止することができる。   In the above current interrupting device, the gap between the first energizing member and the second energizing member is separated into the first space and the second space by the seal member, and the second space communicates with the space in the case. For this reason, the electrolytic solution in the case may enter the second space. However, in the second space, the sealing member is located in the entire range where the first energizing member and the second energizing member are opposed to each other, and the first energizing member and the second energizing member are in a state where the electrolyte exists between them. Direct facing is prevented. Thereby, the liquid junction between the first energizing member and the second energizing member is prevented. That is, even if the electrolyte enters the second space between the first energization member and the second energization member, the seal member is appropriately disposed between the two, and thus the liquid junction between the two can be prevented. it can. Further, in this current interrupting device, since the electrolyte solution is allowed to enter between the first energizing member and the second energizing member, it is not necessary to use two sealing members as in the prior art, and the structure is simple. A liquid junction can be prevented.

さらに、上記の対向面とその外周面により形成される角部にテーパが設けられ、シール部材がテーパの形成された部分に接触している。このような構成によると、ケース内の内圧が上昇してその内圧がシール部材に作用した場合に、その内圧が作用しているシール部材をテーパが形成された部位で受け止めることができる。このため、第１通電部材と第２通電部材の間の適切な位置にシール部材を保持することができる。 Further, a taper is provided at a corner formed by the above-described opposing surface and the outer peripheral surface thereof, and the seal member is in contact with the portion where the taper is formed. According to such a configuration, when the internal pressure in the case rises and the internal pressure acts on the seal member, the seal member on which the internal pressure acts can be received at the portion where the taper is formed. For this reason, a sealing member can be hold | maintained in the appropriate position between a 1st electricity supply member and a 2nd electricity supply member.

蓄電装置の断面図Cross section of power storage device 端子と電極が通電しているときの電流遮断装置を示す図Diagram showing current interrupting device when terminal and electrode are energized 端子と電極が通電していないときの電流遮断装置を示す図Diagram showing current interrupting device when terminal and electrode are not energized 図２Ａの点線で囲まれた部分２００を拡大して示す図The figure which expands and shows the part 200 enclosed with the dotted line of FIG. 2A 液絡を防止するためのシール構造の他の例を示す図The figure which shows the other example of the seal structure for preventing a liquid junction 液絡を防止するためのシール構造のさらに他の例を示す図The figure which shows the further another example of the seal structure for preventing a liquid junction

以下、本明細書で開示する実施例の技術的特徴の幾つかを記す。なお、以下に記す事項は、各々単独で技術的な有用性を有している。 Hereinafter, some technical features of the embodiments disclosed in this specification will be described. The items described below have technical usefulness independently.

（特徴１） 本明細書に開示する電流遮断装置では、シール部材は、第１通電部材または第２通電部材の外周部に沿って配置される共にその外周部を一巡する一つの部材であってもよい。このような構成によると、シール部材が第１通電部材または第２通電部材の外周部を一巡する一つの部材で構成されるため、２つの通電部材とシール部材の組付けを容易に行うことができる。 (Feature 1) In the current interrupt device disclosed in the present specification, the seal member is a member that is arranged along the outer peripheral portion of the first energizing member or the second energizing member and goes around the outer peripheral portion. Also good. According to such a configuration, since the seal member is constituted by one member that goes around the outer periphery of the first energization member or the second energization member, the two energization members and the seal member can be easily assembled. it can.

（特徴２） 本明細書に開示する電流遮断装置では、第１通電部材と第２通電部材の間の第１空間に設けられ、第１通電部材と第２通電部材に接触する絶縁部材をさらに備えていてもよい。このような構成によると、通電が遮断されたときに、第１通電部材と第２通電部材の絶縁状態を良好に維持することができる。 (Characteristic 2) In the current interrupt device disclosed in the present specification, an insulating member provided in the first space between the first energization member and the second energization member and in contact with the first energization member and the second energization member is further provided. You may have. According to such a configuration, when the energization is interrupted, the insulation state between the first energization member and the second energization member can be favorably maintained.

（実施例）
以下、第１実施例の蓄電装置１００について説明する。蓄電装置１００は、二次電池の一種であるリチウムイオン二次電池である。図１に示すように、蓄電装置１００は、ケース４と、電極組立体２と、電極端子としての負極端子３０、及び正極端子１０と、電流遮断装置７０を備えている。ケース４は、金属製であり、略直方体形状である。ケース４の内部には、電極組立体２と電流遮断装置７０が収容されている。また、ケース４の内部は、電解液で満たされている。ケース４の上面４ａにおいて、負極端子３０と正極端子１０が、ケース４の外部に露出している。ケース４の上面４ａには、貫通孔４ｂ，４ｃが形成されている。負極端子３０が貫通孔４ｂを通過しており、正極端子１０が貫通孔４ｃを通過している。貫通孔４ｂには、絶縁性の第１シール部材４２が取り付けられている。貫通孔４ｃには、絶縁性の第２シール部材２２が取り付けられている。なお、ケース４の形状に制限はなく、例えば、円筒状、直方体状、あるいは、フィルムで形成されているシート状であってもよい。 (Example)
Hereinafter, the power storage device 100 of the first embodiment will be described. The power storage device 100 is a lithium ion secondary battery that is a type of secondary battery. As shown in FIG. 1, the power storage device 100 includes a case 4, an electrode assembly 2, a negative electrode terminal 30 as an electrode terminal, a positive electrode terminal 10, and a current interrupt device 70. The case 4 is made of metal and has a substantially rectangular parallelepiped shape. Inside the case 4, the electrode assembly 2 and the current interrupt device 70 are accommodated. Further, the inside of the case 4 is filled with an electrolytic solution. On the upper surface 4 a of the case 4, the negative electrode terminal 30 and the positive electrode terminal 10 are exposed to the outside of the case 4. Through holes 4 b and 4 c are formed in the upper surface 4 a of the case 4. The negative terminal 30 passes through the through hole 4b, and the positive terminal 10 passes through the through hole 4c. An insulating first seal member 42 is attached to the through hole 4b. An insulating second seal member 22 is attached to the through hole 4c. Note that the shape of the case 4 is not limited, and may be, for example, a cylindrical shape, a rectangular parallelepiped shape, or a sheet shape formed of a film.

負極端子３０は、外部ナット３６と、内部ナット３２と、ボルト３４を備えている。外部ナット３６は、負極端子３０と負極配線（図示省略）との結線に用いられる。内部ナット３２は、第１シール部材４２に取り付けられている。内部ナット３２の一部は、貫通孔４ｂを通過している。ボルト３４は、内部ナット３２に締結されている。ボルト３４とケース４の間には、第３シール部材４０が介在している。負極端子３０は、シール部材４０，４２によってケース４から絶縁されている。内部ナット３２は、電流遮断装置７０及び接続端子７２を介して負極リード４４に電気的に接続されている。負極リード４４は、第１シール部材４２によってケース４から絶縁されている。負極端子３０は、電流遮断装置７０、接続端子７２及び負極リード４４を介して、電極組立体２の負極電極と通電している。電流遮断装置７０については後述する。   The negative electrode terminal 30 includes an external nut 36, an internal nut 32, and a bolt 34. The external nut 36 is used for connection between the negative electrode terminal 30 and a negative electrode wiring (not shown). The inner nut 32 is attached to the first seal member 42. A part of the inner nut 32 passes through the through hole 4b. The bolt 34 is fastened to the internal nut 32. A third seal member 40 is interposed between the bolt 34 and the case 4. The negative electrode terminal 30 is insulated from the case 4 by the seal members 40 and 42. The inner nut 32 is electrically connected to the negative electrode lead 44 via the current interrupt device 70 and the connection terminal 72. The negative electrode lead 44 is insulated from the case 4 by the first seal member 42. The negative electrode terminal 30 is energized with the negative electrode of the electrode assembly 2 via the current interrupt device 70, the connection terminal 72, and the negative electrode lead 44. The current interrupt device 70 will be described later.

正極端子１０は、外部ナット１６と、内部ナット１２と、ボルト１４を備えている。外部ナット１６は、正極端子１０と正極配線（図示省略）との結線に用いられる。内部ナット１２は、第２シール部材２２に取り付けられている。内部ナット１２の一部は、貫通孔４ｃを通過している。ボルト１４は、内部ナット１２に締結されている。ボルト１４とケース４の間には、第４シール部材２０が介在している。正極端子１０は、シール部材２０，２２によってケース４から絶縁されている。内部ナット１２には、正極リード２４が固定されている。内部ナット１２と正極リード２４は、電気的に接続している。正極リード２４は、第２シール部材２２によってケース４から絶縁されている。正極端子１０は、正極リード２４を介して、電極組立体２の正極電極と通電している。   The positive terminal 10 includes an external nut 16, an internal nut 12, and a bolt 14. The external nut 16 is used for connection between the positive terminal 10 and the positive wiring (not shown). The inner nut 12 is attached to the second seal member 22. A part of the inner nut 12 passes through the through hole 4c. The bolt 14 is fastened to the inner nut 12. A fourth seal member 20 is interposed between the bolt 14 and the case 4. The positive electrode terminal 10 is insulated from the case 4 by the seal members 20 and 22. A positive electrode lead 24 is fixed to the inner nut 12. The inner nut 12 and the positive electrode lead 24 are electrically connected. The positive electrode lead 24 is insulated from the case 4 by the second seal member 22. The positive electrode terminal 10 is energized with the positive electrode of the electrode assembly 2 via the positive electrode lead 24.

（電極組立体）
電極組立体２は、ケース４の上面４ａ側に突出する凸部２ａを備えている。電極組立体２は、正極電極と、負極電極と、正極電極と負極電極の間に介在しているセパレータを備えている。正極電極、負極電極及びセパレータの図示は省略する。負極電極は、負極集電体と、負極集電体上に形成されている負極活物質層を有する。負極電極は、その端部に負極集電タブ４６を有する。負極集電タブ４６には、負極活物質層が塗布されていない。正極電極は、正極集電体と、正極集電体上に形成されている正極活物質層を有する。正極電極は、その端部に正極集電タブ２６を有する。正極集電タブ２６には、正極活物質層が塗布されていない。なお、活物質層に含まれる材料（活物質、バインダ、導電助剤等）には特に制限がなく、公知の蓄電装置等の電極に用いられる材料を用いることができる。 (Electrode assembly)
The electrode assembly 2 includes a protrusion 2 a that protrudes toward the upper surface 4 a of the case 4. The electrode assembly 2 includes a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. Illustration of the positive electrode, the negative electrode, and the separator is omitted. The negative electrode has a negative electrode current collector and a negative electrode active material layer formed on the negative electrode current collector. The negative electrode has a negative electrode current collecting tab 46 at its end. A negative electrode active material layer is not applied to the negative electrode current collecting tab 46. The positive electrode has a positive electrode current collector and a positive electrode active material layer formed on the positive electrode current collector. The positive electrode has a positive electrode current collecting tab 26 at its end. The positive electrode current collecting tab 26 is not coated with a positive electrode active material layer. Note that there are no particular limitations on materials (eg, active material, binder, and conductive additive) included in the active material layer, and materials that are used for electrodes of known power storage devices and the like can be used.

ここで、正極集電体には、例えば、アルミニウム（Ａｌ）、ニッケル（Ｎｉ）、チタン（Ｔｉ）、ステンレス鋼又はそれらの複合材料もしくは合金を用いることができる。特に、アルミニウム又はアルミニウムを含む複合材料もしくは合金であることが好ましい。また、正極活物質には、リチウムイオンが侵入及び脱離可能な材料であればよく、Ｌｉ２ＭｎＯ３、Ｌｉ（ＮｉＣｏＭｎ）０．３３Ｏ２、Ｌｉ(ＮｉＭｎ)０．５Ｏ２、ＬｉＭｎ２Ｏ４、ＬｉＭｎＯ２、ＬｉＮｉＯ２、ＬｉＣｏＯ２、ＬｉＮｉ０．８Ｃｏ０．１５Ａｌ０．０５Ｏ２、Ｌｉ２ＭｎＯ２、ＬｉＭｎ２Ｏ４等を使用することができる。また、正極活物質としてリチウム、ナトリウム等のアルカリ金属、あるいは、硫黄などを用いることもできる。これらは１種単独で使用してもよいし、２種以上を併用して用いてもよい。正極活物質は、必要に応じて導電材，結着剤等とともに正極集電体に塗布される。 Here, for the positive electrode current collector, for example, aluminum (Al), nickel (Ni), titanium (Ti), stainless steel, or a composite material or alloy thereof can be used. In particular, aluminum or a composite material or alloy containing aluminum is preferable. The positive electrode active material may be any material that allows lithium ions to enter and desorb, and Li 2 MnO 3 , Li (NiCoMn) 0.33 O 2 , Li (NiMn) 0.5 O 2 , LiMn 2 O 4 , LiMnO 2 , LiNiO 2 , LiCoO 2 , LiNi 0.8 Co 0.15 Al 0.05 O 2 , Li 2 MnO 2 , LiMn 2 O 4 and the like can be used. In addition, alkali metals such as lithium and sodium, or sulfur can be used as the positive electrode active material. These may be used alone or in combination of two or more. The positive electrode active material is applied to the positive electrode current collector together with a conductive material, a binder and the like as necessary.

一方、負極集電体としては、アルミニウム、ニッケル、銅（Ｃｕ）等、又はそれらの複合材料もしくは合金等を使用することができる。特に、銅又は銅を含む複合材料もしくは合金であることが好ましい。また、負極活物質としては、リチウムイオンが侵入及び脱離可能な材料を用いることができる。リチウム（Ｌｉ）、ナトリウム（Ｎａ）等のアルカリ金属、アルカリ金属を含む遷移金属酸化物、天然黒鉛、メソカーボンマイクロビーズ、高配向性グラファイト、ハードカーボン、ソフトカーボン等の炭素材料、シリコン単体又はシリコン含有合金又はシリコン含有酸化物を使用することができる。負極活物質は、必要に応じて導電材，結着剤等とともに負極集電体に塗布される。   On the other hand, as the negative electrode current collector, aluminum, nickel, copper (Cu), or a composite material or alloy thereof can be used. In particular, copper or a composite material or alloy containing copper is preferable. Further, as the negative electrode active material, a material in which lithium ions can enter and leave can be used. Alkali metals such as lithium (Li) and sodium (Na), transition metal oxides containing alkali metals, natural graphite, mesocarbon microbeads, highly oriented graphite, carbon materials such as hard carbon, soft carbon, silicon alone or silicon A containing alloy or a silicon-containing oxide can be used. A negative electrode active material is apply | coated to a negative electrode collector with a electrically conductive material, a binder, etc. as needed.

なお、セパレータは、絶縁性を有する多孔質を用いることができる。セパレータとしては、ポリエチレン（ＰＥ）、ポリプロピレン（ＰＰ）等のポリオレフィン系樹脂からなる多孔質フィルム、あるいは、ポリプロピレン、ポリエチレンテレフタレート（ＰＥＴ）、メチルセルロース等からなる織布または不織布を使用することができる。   Note that the separator can be made of an insulating porous material. As the separator, a porous film made of a polyolefin-based resin such as polyethylene (PE) or polypropylene (PP), or a woven or non-woven fabric made of polypropylene, polyethylene terephthalate (PET), methyl cellulose or the like can be used.

また、電解液は、非水系の溶媒に支持塩（電解質）を溶解させた非水電解液であることが好ましい。非水系の溶媒として、エチレンカーボネート（ＥＣ）、プロピレンカーボネート（ＰＣ）、ジメチルカーボネート（ＤＭＣ）、ジエチルカーボネート（ＤＥＣ）、エチルメチルカーボネート（ＥＭＣ）等の鎖状エステルを含んでいる溶媒、酢酸エチル、プロピロン酸メチルなどの溶媒、又はこれらの混合液を使用することができる。また、支持塩（電解質）として、例えば、ＬｉＰＦ６、ＬｉＢＦ４、ＬｉＡｓＦ６等を使用することができる。 The electrolytic solution is preferably a non-aqueous electrolytic solution in which a supporting salt (electrolyte) is dissolved in a non-aqueous solvent. As a non-aqueous solvent, a solvent containing a chain ester such as ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), ethyl acetate, A solvent such as methyl propionate or a mixture thereof can be used. Moreover, as a supporting salt (electrolyte), for example, can be used LiPF 6, LiBF 4, LiAsF 6, and the like.

（電流遮断装置）
図２Ａおよび図２Ｂを参照して、電流遮断装置７０について説明する。電流遮断装置７０は、負極端子３０と負極集電タブ（負極電極）４６の間に接続されている。なお、電流遮断装置７０は、正極電極と正極端子１０の間に接続してもよいし、負極電極と負極端子３０の間、及び、正極電極と正極端子１０の間の双方に接続してもよい。なお、図２Ａ，図２Ｂでは、負極端子３０とケース４との間に介在しているシール部材４２の図示を省略している。 (Current interrupter)
With reference to FIG. 2A and FIG. 2B, the electric current interruption apparatus 70 is demonstrated. The current interrupt device 70 is connected between the negative electrode terminal 30 and the negative electrode current collecting tab (negative electrode) 46. The current interrupt device 70 may be connected between the positive electrode and the positive terminal 10, or may be connected between the negative electrode and the negative terminal 30 and between the positive electrode and the positive terminal 10. Good. 2A and 2B, the illustration of the seal member 42 interposed between the negative electrode terminal 30 and the case 4 is omitted.

図２Ａに示すように電流遮断装置７０は、金属製の第１反転板８４と、金属製の破断板８８と、金属製の第２反転板９０と、絶縁性を有する支持部材９２を備えている。支持部材９２は、第１反転板８４と破断板８８と第２反転板９０を支持している。すなわち、支持部材９２は、第１反転板８４と破断板８８と第２反転板９０に対して外側より嵌め込まれ、第１反転板８４と破断板８８と第２反転板９０を積層した状態で支持している。支持部材９２の外周面には、金属製の板材７８が取付けられている。具体的には、支持部材９２が第１反転板８４、破断板８８、第２反転板９０、及び内部ナット３２の下端部を上下から挟み込んだ状態で、板材７８が支持部材９２の外周面にカシメられている。これにより、電流遮断装置７０が内部ナット３２に取付けられている。なお、支持部材９２及び板材７８の外周面には、周方向の一部において開口９３が形成されている。開口９３はケース４内の空間と連通しており、その開口９３内には接続端子７２が配置されている。これによって、支持部材９２及び板材７８の内部に配置される破断板８８と負極リード４４とが接続端子７２を介して接続されている。   As shown in FIG. 2A, the current interrupting device 70 includes a metal first reversing plate 84, a metal breaking plate 88, a metal second reversing plate 90, and an insulating support member 92. Yes. The support member 92 supports the first reverse plate 84, the fracture plate 88, and the second reverse plate 90. That is, the support member 92 is fitted from the outside with respect to the first reversing plate 84, the breaking plate 88, and the second reversing plate 90, and the first reversing plate 84, the breaking plate 88, and the second reversing plate 90 are stacked. I support it. A metal plate 78 is attached to the outer peripheral surface of the support member 92. Specifically, with the support member 92 sandwiching the lower ends of the first reversing plate 84, the fracture plate 88, the second reversing plate 90, and the internal nut 32 from above and below, the plate material 78 is placed on the outer peripheral surface of the support member 92. It is caulked. Thereby, the current interrupt device 70 is attached to the inner nut 32. Note that openings 93 are formed in part of the circumferential direction on the outer peripheral surfaces of the support member 92 and the plate member 78. The opening 93 communicates with the space in the case 4, and the connection terminal 72 is disposed in the opening 93. As a result, the breaker plate 88 and the negative electrode lead 44 disposed inside the support member 92 and the plate member 78 are connected via the connection terminal 72.

第１反転板８４は、円形状の板材であり、破断板８８の下方に配置されている。第１反転板８４の外周縁の下面は、全周に亘って支持部材９２に支持されている。第１反転板８４の外周縁の上面には絶縁部材８０が配置されている。絶縁部材８０は、リング状の部材であり、第１反転板８４と破断板８８とを絶縁している。また、第１反転板８４の上面には突部８６が設けられ、突部８６は第一反転板８４の中央に位置している。突部８６は、破断板８８に向かって上方に突出している。図２Ａに示す状態で、突部８６と破断板８８の中央部８８ｂとの間には隙間が形成されている。なお、第１反転板８４の下面にはケース４内の空間の圧力が作用し、第１反転板８４の上面には、第１反転板８４と破断板８８の間の空間９４の圧力が作用する。空間９４とケース４内の空間とはシールされているため、ケース４内の空間の圧力が高くなると、第１反転板８４の上面と下面に作用する圧力は相違することとなる。   The first inversion plate 84 is a circular plate material and is disposed below the fracture plate 88. The lower surface of the outer peripheral edge of the first reversing plate 84 is supported by the support member 92 over the entire circumference. An insulating member 80 is disposed on the upper surface of the outer peripheral edge of the first reversing plate 84. The insulating member 80 is a ring-shaped member and insulates the first reversing plate 84 and the fracture plate 88. Further, a protrusion 86 is provided on the upper surface of the first reversing plate 84, and the protrusion 86 is located at the center of the first reversing plate 84. The protrusion 86 protrudes upward toward the fracture plate 88. In the state shown in FIG. 2A, a gap is formed between the protrusion 86 and the central portion 88 b of the fracture plate 88. The pressure in the space in the case 4 acts on the lower surface of the first reversing plate 84, and the pressure in the space 94 between the first reversing plate 84 and the fracture plate 88 acts on the upper surface of the first reversing plate 84. To do. Since the space 94 and the space in the case 4 are sealed, when the pressure in the space in the case 4 increases, the pressure acting on the upper surface and the lower surface of the first reversing plate 84 will be different.

破断板８８は、円形状の板材であり、第１反転板８４と第２反転板９０の間に配置されている。破断板８８の外周部の一部に接続端子７２が接続されている。破断板８８の下面の中央には溝部８８ａが形成されている。溝部８８ａは、底面視すると円形状に形成されている。また、図２Ａに示すように、溝部８８ａの断面形状は上方に凸となる三角形状をしている。溝部８８ａが形成されることで、溝部８８ａが形成された位置における破断板８８の機械的強度は、溝部８８ａ以外の位置における破断板８８の機械的強度よりも低くされている。破断板８８は、溝部８８ａによって、溝部８８ａで囲まれた中央部８８ｂと、溝部８８ａの外周側に位置する外周部８８ｃに区分されている。中央部８８ｂの板厚は薄く、外周部８８ｃの板厚は厚くされている。   The fracture plate 88 is a circular plate material, and is disposed between the first reverse plate 84 and the second reverse plate 90. A connection terminal 72 is connected to a part of the outer peripheral portion of the fracture plate 88. A groove 88 a is formed at the center of the lower surface of the fracture plate 88. The groove 88a is formed in a circular shape when viewed from the bottom. Further, as shown in FIG. 2A, the cross-sectional shape of the groove 88a has a triangular shape that protrudes upward. By forming the groove 88a, the mechanical strength of the fracture plate 88 at the position where the groove 88a is formed is lower than the mechanical strength of the fracture plate 88 at a position other than the groove 88a. The fracture plate 88 is divided into a central part 88b surrounded by the groove part 88a and an outer peripheral part 88c located on the outer peripheral side of the groove part 88a by the groove part 88a. The central portion 88b is thin, and the outer peripheral portion 88c is thick.

第２反転板９０は、円形状の板材であり、破断板８８の上方に配置されている。第２反転板９０の中央部は、図２Ａに示す状態では下方に凸となり、また、破断板８８の中央部８８ｂに固定されている。第２反転板９０の外周部は、内部ナット３２に電気的に接続されている。したがって、正極端子３０は、第２反転板９０、破断板８８、接続端子７２及び負極リード４４を介して電極組立体２に接続されている。第２反転板９０の上面と内部ナット３２の下面の間には空間９８が形成され、空間９８はケース４内の空間からシールされている。第２反転板９０と破断板８８の間には、絶縁部材８２が配置されている。絶縁部材８２は、リング状の部材であり、第２反転板９０の外周部と破断板８８の外周部とに接触し、両者を絶縁している。   The second reversing plate 90 is a circular plate material and is disposed above the fracture plate 88. In the state shown in FIG. 2A, the center portion of the second reversing plate 90 protrudes downward, and is fixed to the center portion 88 b of the fracture plate 88. The outer periphery of the second reversing plate 90 is electrically connected to the internal nut 32. Therefore, the positive electrode terminal 30 is connected to the electrode assembly 2 via the second reversal plate 90, the fracture plate 88, the connection terminal 72, and the negative electrode lead 44. A space 98 is formed between the upper surface of the second reversing plate 90 and the lower surface of the internal nut 32, and the space 98 is sealed from the space in the case 4. An insulating member 82 is disposed between the second reversing plate 90 and the fracture plate 88. The insulating member 82 is a ring-shaped member and is in contact with the outer peripheral portion of the second reversing plate 90 and the outer peripheral portion of the fracture plate 88 to insulate them.

ここで、本実施例では、破断板８８と内部ナット３２の外周部の間にはシール部材８９がさらに配置されている。シール部材８９は、断面円形のリング状の部材であり、絶縁部材８２の外側に配置されている。シール部材８９は、内部ナット３２の下面及び破断板８８の上面に接触し、内部ナット３２及び破断板８８の外周部に沿って一巡している。シール部材８９は、内部ナット３２と破断板８８との間の隙間を封止（シール）している。したがって、第２反転板９０と内部ナットの下方で、かつ、破断板８８の上方に位置する空間は、シール部材８９によって内側の空間９６と、外側の空間６３（図３参照）に隔離している。このため、絶縁部材８２は、シール部材８９より内側の空間９６内に配置されているということができる。また、上述したように、シール部材８９より外側の空間６３は、支持部材９２及び板材７８に形成された開口９３を介してケース４内の空間と連通している。一方、空間９６はシール部材８９によって空間６３からシールされるため、空間９６とケース４内の空間とが連通することはない。   Here, in this embodiment, a seal member 89 is further disposed between the fracture plate 88 and the outer peripheral portion of the internal nut 32. The seal member 89 is a ring-shaped member having a circular cross section, and is disposed outside the insulating member 82. The seal member 89 is in contact with the lower surface of the internal nut 32 and the upper surface of the fracture plate 88, and makes a round along the outer periphery of the internal nut 32 and the fracture plate 88. The seal member 89 seals (seal) the gap between the internal nut 32 and the fracture plate 88. Therefore, the space located below the second reversing plate 90 and the inner nut and above the breaking plate 88 is separated into the inner space 96 and the outer space 63 (see FIG. 3) by the seal member 89. Yes. For this reason, it can be said that the insulating member 82 is arranged in the space 96 inside the seal member 89. Further, as described above, the space 63 outside the seal member 89 communicates with the space in the case 4 through the support member 92 and the opening 93 formed in the plate member 78. On the other hand, since the space 96 is sealed from the space 63 by the sealing member 89, the space 96 and the space in the case 4 do not communicate with each other.

図３に示すように、シール部材８９は内部ナット３２と破断板８８の間で圧縮されている。また、内部ナット３２は、シール部材８９における第１接触部６０で接触している。さらに、破断板８８は、シール部材８９における第２接触部６１で接触している。図３から明らかなように、電流遮断装置７０を平面視すると、内部ナット３２と破断板８８が対向している範囲内においては、第１接触部６０および第２接触部６１より外側の領域６４の全体にシール部材８９が存在している。すなわち、シール部材８９は、周方向の全域において、内部ナット３２の外周縁及び破断板８８の外周縁より外側に突出している。このため、第１接触部６０および第２接触部６１より外側の領域６４では、内部ナット３２と破断板８８が直接対向することはなく、内部ナット３２の下面はシール部材８９の上面に対向し、破断板８８の上面はシール部材８９の下面に対向している。   As shown in FIG. 3, the seal member 89 is compressed between the inner nut 32 and the fracture plate 88. Further, the inner nut 32 is in contact with the first contact portion 60 in the seal member 89. Further, the fracture plate 88 is in contact with the second contact portion 61 in the seal member 89. As is clear from FIG. 3, when the current interrupt device 70 is viewed in plan, the region 64 outside the first contact portion 60 and the second contact portion 61 is within the range where the internal nut 32 and the fracture plate 88 face each other. The sealing member 89 exists in the whole. That is, the seal member 89 projects outward from the outer peripheral edge of the inner nut 32 and the outer peripheral edge of the fracture plate 88 in the entire circumferential direction. For this reason, in the region 64 outside the first contact portion 60 and the second contact portion 61, the inner nut 32 and the fracture plate 88 do not directly face each other, and the lower surface of the inner nut 32 faces the upper surface of the seal member 89. The upper surface of the fracture plate 88 faces the lower surface of the seal member 89.

上述した蓄電装置１００においては、図２Ａに示す状態では、負極端子３０と負極集電タブ４６（負極電極）が通電しており、正極端子１０と正極集電タブ２６（負極電極）が通電している。そのため、負極端子３０と正極端子１０の間が通電している。ケース４内の内圧が上昇して予め設定された所定値を超えると、図２Ｂに示すように、破断板８８が溝部８８ａで破断し、破断板８８の外周部８８ｃと第２反転板９０（内部ナット３２）の間の通電経路が遮断される。すなわち、ケース４内の内圧が上昇すると、第１反転板８４の下面に作用する圧力が上昇する（図２Ａの状態）。第１反転板８４の上面に作用する圧力（すなわち、空間９４の圧力）は、ケース４内の圧力上昇の影響を受けることはなく変化しない。このため、ケース４内の内圧が所定値を超えると、第１反転板８４が反転して、下方に凸な状態から上方に凸な状態に変化する。第１反転板８４が反転すると、第１反転板８４の突部８６が破断板８８の中央部８８ｂに衝突し、破断板８８が溝部８８ａで破断する。すると、第１反転板８４の変位に応じて第２反転板９０も反転し、第２反転板９０、破断板８８の中央部、及び第１反転板８４が上方に変位する（図２Ｂの状態）。これによって、破断板８８と第２反転板を接続する通電経路が遮断され、電極組立体２と負極端子３０との間の通電が遮断される。   In the power storage device 100 described above, in the state shown in FIG. 2A, the negative electrode terminal 30 and the negative electrode current collecting tab 46 (negative electrode) are energized, and the positive electrode terminal 10 and the positive electrode current collecting tab 26 (negative electrode) are energized. ing. For this reason, the negative electrode terminal 30 and the positive electrode terminal 10 are energized. When the internal pressure in the case 4 rises and exceeds a predetermined value set in advance, as shown in FIG. 2B, the fracture plate 88 breaks at the groove 88a, and the outer peripheral portion 88c of the fracture plate 88 and the second reversing plate 90 ( The energization path between the inner nuts 32) is interrupted. That is, when the internal pressure in the case 4 increases, the pressure acting on the lower surface of the first reversing plate 84 increases (state shown in FIG. 2A). The pressure acting on the upper surface of the first reversing plate 84 (that is, the pressure in the space 94) is not affected by the pressure increase in the case 4 and does not change. For this reason, when the internal pressure in the case 4 exceeds a predetermined value, the first reversing plate 84 is reversed to change from a downward convex state to an upward convex state. When the first reversing plate 84 is reversed, the protrusion 86 of the first reversing plate 84 collides with the central portion 88b of the breaking plate 88, and the breaking plate 88 is broken at the groove 88a. Then, the second reversing plate 90 is also reversed in accordance with the displacement of the first reversing plate 84, and the second reversing plate 90, the central portion of the fracture plate 88, and the first reversing plate 84 are displaced upward (state of FIG. 2B). ). As a result, the energization path connecting the fracture plate 88 and the second reversing plate is interrupted, and the energization between the electrode assembly 2 and the negative electrode terminal 30 is interrupted.

破断板８８が溝部８８ａで破断した状態（（図２Ｂに示す状態）となっても、負極端子３０は外部機器に接続されており、破断板８８は電極組立体２の負極に接続されている。このため、負極端子３０（すなわち、内部ナット３２）と破断板８８の間に大きな電圧が印加されることがある。また、空間６３はケース４内の空間に連通しているため、空間６３内に電解液が侵入する可能性がある。しかしながら、本実施例の電流遮断装置７０では、内部ナット３２と破断板８８が対向している範囲内において、第１接触部６０および第２接触部６１より外側の領域６４の全体にシール部材８９が存在している。このため、内部ナット３２と破断板８８の間に大きな電圧が印加されても、電解液から導電性異物が生成することが抑制される。その結果、内部ナット３２と破断板８８とが液洛し、内部ナット３２と破断板８８とが再び通電することを抑制することができる。   Even when the breaking plate 88 is broken at the groove 88a (the state shown in FIG. 2B), the negative terminal 30 is connected to the external device, and the breaking plate 88 is connected to the negative electrode of the electrode assembly 2. For this reason, a large voltage may be applied between the negative electrode terminal 30 (that is, the internal nut 32) and the breaker plate 88. Since the space 63 communicates with the space in the case 4, the space 63 However, in the current interrupt device 70 of this embodiment, the first contact portion 60 and the second contact portion are within the range where the inner nut 32 and the fracture plate 88 are opposed to each other. The seal member 89 exists in the entire region 64 outside 61. Therefore, even when a large voltage is applied between the inner nut 32 and the fracture plate 88, conductive foreign matter may be generated from the electrolyte. Suppressed. Fruit, and Ekiraku and internal nut 32 and rupture plate 88, an inner nut 32 and rupture plate 88 can be prevented from being energized again.

なお、上述した電流遮断装置７０では、シール部材８９によって、内部ナット３２と破断板８８との液洛の抑制と、内部ナット３２と破断板８８との隙間のシールを行う。このため、単一の部材であるシール部材８９によって複数の機能（液洛防止機能、シール機能）を果たすため、電流遮断装置７０の構成を簡易にすることができる。   In the above-described current interrupting device 70, the sealing member 89 suppresses liquid drop between the internal nut 32 and the fracture plate 88 and seals the gap between the internal nut 32 and the fracture plate 88. For this reason, since the sealing member 89 that is a single member performs a plurality of functions (a liquid droplet prevention function and a sealing function), the configuration of the current interrupting device 70 can be simplified.

最後に、上述した実施例と特許請求の範囲の記載の対応関係を説明する。内部ナット３２と第２反転板９０が「第１通電部材」の一例であり、破断板８８が「第２通電部材」の一例であり、空間９６が「第１空間」の一例であり、空間６３が「第２空間」の一例である。   Finally, the correspondence relationship between the above-described embodiment and the description of the claims will be described. The inner nut 32 and the second reversing plate 90 are an example of a “first energizing member”, the fracture plate 88 is an example of a “second energizing member”, and the space 96 is an example of a “first space”. 63 is an example of a “second space”.

なお、上述した実施例では、シール部材８９が内部ナット３２と破断板８８の２つの部材にのみ接触していたが、このような構成には限らない。例えば図４に示す例では、内部ナット３２と破断板８８に加え、シール部材８９が支持部材９２ａに第３接触部６５で接触している。これにより、シール部材８９は第１接触部６０と第２接触部６１と第３接触部６５の３ヶ所で、内部ナット３２と破断板８８と支持部材９２ａに接触している。よって、第２空間６３はシール部材８９により、第１接触部６０側の空間６３１と第２接触部側の空間６３２に隔離される。それゆえ、空間６３２に侵入した電解液は第３接触部６５により空間６３１に侵入することが抑制され、よって内部ナット３２と破断板８８の間の液絡をより確実に防止することができる。   In the above-described embodiment, the seal member 89 is in contact with only the two members of the inner nut 32 and the fracture plate 88, but the present invention is not limited to such a configuration. For example, in the example shown in FIG. 4, in addition to the inner nut 32 and the fracture plate 88, the seal member 89 is in contact with the support member 92 a at the third contact portion 65. As a result, the seal member 89 is in contact with the internal nut 32, the fracture plate 88, and the support member 92 a at three locations of the first contact portion 60, the second contact portion 61, and the third contact portion 65. Therefore, the second space 63 is separated by the seal member 89 into a space 631 on the first contact portion 60 side and a space 632 on the second contact portion side. Therefore, the electrolyte solution that has entered the space 632 is suppressed from entering the space 631 by the third contact portion 65, and thus a liquid junction between the internal nut 32 and the fracture plate 88 can be more reliably prevented.

また、上述した実施例では内部ナット３２の下面と破断板８８の上面とが対向しており、これらの面の互いに平行となる位置でシール部材８９が各面に接触していたが、このような構成には限らない。例えば図５に示す例では、内部ナット３２ａの破断板８８側の面の外周角部（破断板８８と対向する面と内部ナット３２ａの外周面により形成される角部）にテーパー部６６が設けられている。シール部材８９は内部ナット３２ａのテーパー部６６と接触するように配され、テーパー部６６と第１接触部６０ａで接触している。また、シール部材８９は破断板８８と第２接触部６１ａで接触し、支持部材９２ａと第３接触部６５で接触している。ケース内の圧力が上昇し、シール部材８９に第１空間９６へと向う外力６７が作用すると、この外力をテーパー部６６で受けることができる。これによって、シール部材８９にかかる力のつり合いは保持され、シール部材８９と内部ナット３２ａと破断板８８との適切な位置関係が保持される。よって、シール部材８９による液絡防止機能が損なわれることを防ぐことができる。   In the above-described embodiment, the lower surface of the inner nut 32 and the upper surface of the fracture plate 88 face each other, and the seal member 89 is in contact with each surface at a position where these surfaces are parallel to each other. The configuration is not limited to this. For example, in the example shown in FIG. 5, the tapered portion 66 is provided at the outer peripheral corner portion (the corner portion formed by the surface facing the fracture plate 88 and the outer peripheral surface of the internal nut 32a) of the surface of the inner nut 32a on the fracture plate 88 side. It has been. The seal member 89 is disposed so as to contact the tapered portion 66 of the inner nut 32a, and is in contact with the tapered portion 66 and the first contact portion 60a. Further, the seal member 89 is in contact with the fracture plate 88 at the second contact portion 61a, and is in contact with the support member 92a at the third contact portion 65. When the pressure in the case rises and an external force 67 directed to the first space 96 acts on the seal member 89, this external force can be received by the tapered portion 66. Thereby, balance of force applied to the seal member 89 is maintained, and an appropriate positional relationship among the seal member 89, the internal nut 32a, and the fracture plate 88 is maintained. Therefore, it is possible to prevent the liquid junction preventing function by the sealing member 89 from being impaired.

なお図４，５に示す例においては、図１に示す実施例と同一の構成部品には同一符号を付しているが、図１に示す実施例と構成が一部相違する部品には、図１に示す実施例の対応する部品と同一の符号に加えてａをさらに付している。   In the example shown in FIGS. 4 and 5, the same reference numerals are given to the same components as those in the embodiment shown in FIG. In addition to the same reference numerals as the corresponding parts in the embodiment shown in FIG.

なお、上述した実施例で設けられるシール部材８９の断面形状は図示にあるような真円形状には限らない。例えば楕円形状や多角形状であってもよい。また、上述した実施例では、接続部材７２と破断板８８が別部材で備えられていたが、接続部材７２と破断板８８が一体で形成されていてもよい。   The cross-sectional shape of the seal member 89 provided in the above-described embodiment is not limited to a perfect circle shape as shown in the drawing. For example, it may be oval or polygonal. In the above-described embodiment, the connecting member 72 and the breaking plate 88 are provided as separate members, but the connecting member 72 and the breaking plate 88 may be integrally formed.

また、上述した実施例は、２枚の反転板８４，９６を備えた電流遮断装置７０であったが、電流遮断装置の構成はこのような例に限られない。例えば、電流遮断装置は、１枚の反転板と破断板により構成してもよい。すなわち、図２Ａに示す電流遮断装置と同様に、破断板と反転板（第２反転板に相当）とを備え、反転板にケース内の圧力が作用するように構成する。この電流遮断装置では、反転板の下面にケース内の内圧が作用し、反転板の上面と下面に作用する圧力の差圧が所定値を超えると、反転板が反転して破断板が破断する。このような電流遮断装置においても、図１に示す実施例と同様に破断板の外周部と反転板の外周部（内部ナットの外周部）との間にシール部材を配置することで、反転板と破断板の液絡を防止することができる。   Moreover, although the Example mentioned above was the electric current interruption apparatus 70 provided with the two inversion plates 84 and 96, the structure of an electric current interruption apparatus is not restricted to such an example. For example, the current interrupting device may be composed of one reversing plate and a breaking plate. That is, similarly to the current interrupting device shown in FIG. 2A, a breaker plate and a reversing plate (corresponding to a second reversing plate) are provided so that the pressure in the case acts on the reversing plate. In this current interrupt device, when the internal pressure in the case acts on the lower surface of the reversing plate and the differential pressure between the pressures acting on the upper and lower surfaces of the reversing plate exceeds a predetermined value, the reversing plate is reversed and the fracture plate breaks. . In such a current interrupting device, as in the embodiment shown in FIG. 1, a reversing plate is obtained by disposing a seal member between the outer peripheral portion of the fracture plate and the outer peripheral portion of the reversing plate (the outer peripheral portion of the internal nut). And the liquid junction of the broken plate can be prevented.

以上、本発明の具体例を詳細に説明したが、これらは例示に過ぎず、特許請求の範囲を限定するものではない。特許請求の範囲に記載の技術には、以上に例示した具体例を様々に変形、変更したものが含まれる。例えば、第１反転板、及び第２反転板は、それぞれ、圧力を受けて変形するものであればよく、「反転」する構造のものに限られない。また、本明細書または図面に説明した技術要素は、単独であるいは各種の組合せによって技術的有用性を発揮するものであり、出願時の請求項に記載の組合せに限定されるものではない。また、本明細書または図面に例示した技術は複数の目的を同時に達成し得るものであり、そのうちの一つの目的を達成すること自体で技術的有用性を持つものである。   Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. For example, the first reversing plate and the second reversing plate need only be deformed under pressure, and are not limited to those having a “reversing” structure. In addition, the technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in the present specification or the drawings can achieve a plurality of objects at the same time, and has technical utility by achieving one of the objects.

２：電極組立体
４：ケース
１０：正極端子
２０、２２：シール部材
２４：正極リード
２６：正極集電タブ
１２、３２：内部ナット
１４、３４：ボルト
１６、３６：外部ナット
３０：負極端子
４０、４２：シール部材
４４：負極リード
４６：負極集電タブ
６０：第１接触部
６１：第２接触部
６２：第１空間
６３：第２空間
６４：領域
６５：第３接触部
６６：テーパ部
６７、６８：力
７０：電流遮断装置
７２：接続部材
７８：板材
８４：第１反転板
８８：破断板
８２：絶縁部材
８６：突部
８９：シール部材
９０：第２反転板
９２：支持部材
１００：蓄電装置 2: Electrode assembly 4: Case 10: Positive electrode terminal 20, 22: Seal member 24: Positive electrode lead 26: Positive electrode current collecting tab 12, 32: Internal nut 14, 34: Bolt 16, 36: External nut 30: Negative electrode terminal 40 42: seal member 44: negative electrode lead 46: negative electrode current collecting tab 60: first contact portion 61: second contact portion 62: first space 63: second space 64: region 65: third contact portion 66: taper portion 67, 68: force 70: current interrupting device 72: connection member 78: plate member 84: first reversing plate 88: fracture plate 82: insulating member 86: protrusion 89: seal member 90: second reversing plate 92: support member 100 : Power storage device

Claims (4)

ケースに設けられた外部端子と前記ケースに収容された電極組立体とを接続する通電経路を前記ケース内の内圧が所定値を超えた時に遮断する電流遮断装置であって
前記外部端子と電気的に接続された第１通電部材と、
前記第１通電部材と対向して配置され、前記電極組立体と電気的に接続された第２通電部材と、
前記第１通電部材と前記第２通電部材との間に設けられ、前記第１通電部材と前記第２通電部材の隙間を封止する絶縁性のシール部材と、を備え、
前記第１通電部材と前記第２通電部材は、前記ケース内の内圧が所定値以下の時は互いに通電して前記通電経路の一部を形成する一方、前記ケース内の内圧が所定値を超えると互いに離間して前記通電経路を遮断し、
前記シール部材は、前記第１通電部材の外周縁の近傍に接触する第１接触部と、前記第２通電部材の外周縁の近傍に接触する第２接触部を有しており、前記第１通電部材と前記第２通電部材の間の隙間を前記第１接触部および前記第２接触部より内側の第１空間と外側の第２空間とに離隔し、
前記第２空間は前記ケース内の空間と連通しており、
前記第１空間は、前記シール部材により、前記ケース内の空間から封止されており、
前記第１通電部材と前記第２通電部材と前記シール部材を平面視すると、前記第１通電部材と前記第２通電部材が対向する範囲内において、前記第１接触部および前記第２接触部より外側の領域全体に前記シール部材が位置しており、
前記第１通電部材と前記第２通電部材の少なくとも一方は、前記第１通電部材と前記第２通電部材の他方と対向する対向面を有すると共に、その対向面と外周面により形成される角部にテーパが設けられており、
前記シール部材が前記テーパの形成された部分に接触している、
ことを特徴とする電流遮断装置。 A current interrupting device for interrupting an energization path connecting an external terminal provided in a case and an electrode assembly accommodated in the case when an internal pressure in the case exceeds a predetermined value. A first current-carrying member connected to
A second energization member disposed opposite the first energization member and electrically connected to the electrode assembly;
An insulating seal member provided between the first energizing member and the second energizing member and sealing a gap between the first energizing member and the second energizing member;
The first energization member and the second energization member are energized to form a part of the energization path when the internal pressure in the case is less than or equal to a predetermined value, while the internal pressure in the case exceeds a predetermined value And separating the energization path away from each other,
The seal member has a first contact portion that contacts the vicinity of the outer peripheral edge of the first energization member, and a second contact portion that contacts the vicinity of the outer periphery of the second energization member, A gap between the energization member and the second energization member is separated into the first contact portion and the first space inside the second contact portion and the second space outside,
The second space communicates with a space in the case;
The first space is sealed from the space in the case by the seal member,
When the first energization member, the second energization member, and the seal member are viewed in plan, the first contact portion and the second contact portion are within a range where the first energization member and the second energization member face each other. The sealing member is located over the entire outer region;
At least one of the first energizing member and the second energizing member has a facing surface facing the other of the first energizing member and the second energizing member, and a corner formed by the facing surface and the outer peripheral surface. Is provided with a taper,
The seal member is in contact with the tapered portion;
A current interrupting device characterized by that. 前記シール部材は、前記第１通電部材または前記第２通電部材の外周部に沿って配置されると共にその外周部を一巡する一つの部材である請求項１に記載の電流遮断装置。   2. The current interrupting device according to claim 1, wherein the sealing member is a member that is disposed along an outer peripheral portion of the first energizing member or the second energizing member and makes a round around the outer peripheral portion. 前記第１通電部材と前記第２通電部材の間の前記第１空間に設けられ、前記第１通電部材と前記第２通電部材に接触する絶縁部材をさらに備える、請求項１又は２に記載の電流遮断装置。   The insulating member which is provided in the 1st space between the 1st electricity supply member and the 2nd electricity supply member, and contacts the 1st electricity supply member and the 2nd electricity supply member is further provided. Current interrupt device. 請求項１から３のいずれかに記載の電流遮断装置を備える蓄電装置。   A power storage device comprising the current interrupt device according to any one of claims 1 to 3.
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