JP2015056380A - Current interrupting device and power storage device using the same - Google Patents

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

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JP2015056380A
JP2015056380A JP2013190993A JP2013190993A JP2015056380A JP 2015056380 A JP2015056380 A JP 2015056380A JP 2013190993 A JP2013190993 A JP 2013190993A JP 2013190993 A JP2013190993 A JP 2013190993A JP 2015056380 A JP2015056380 A JP 2015056380A
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plate
contact portion
contact
energization
space
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貴之 弘瀬
Takayuki Hirose
貴之 弘瀬
元章 奥田
Motoaki Okuda
元章 奥田
寛恭 西原
Hiroyasu Nishihara
寛恭 西原
厚志 南形
Atsushi MINAGATA
厚志 南形
俊昭 岩
Toshiaki Iwa
俊昭 岩
小川 義博
Yoshihiro Ogawa
義博 小川
淳 光安
Atsushi Mitsuyasu
淳 光安
騎慎 秋吉
Norimitsu AKIYOSHI
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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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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Abstract

PROBLEM TO BE SOLVED: To prevent separated members from reestablishing conduction between them when an electrical conduction path of a current interrupting device is separated.SOLUTION: A current interrupting device 11 interrupts an electrical conduction path of an electrode assembly and an outside terminal when the internal pressure in a case rises exceeding a prescribed level. The current interrupting device 11 comprises a deformation plate 41, an electrical conducting plate 43 and a contact plate 45. The deformation plate 41 deforms when the internal pressure in the case rises exceeding a prescribed level, and thereby the electrical conducting plate 43 is broken and the electrical conduction path is interrupted. In the current interrupting device 11, a sealed space 71 which is separated from the outside of the current interrupting device and in which insulation gas is filled is formed in its inside. In a state where the electrical conducting plate 43 is broken, the broken parts are positioned in the sealed space and the insulation gas exists between the broken parts.

Description

本明細書は電流遮断装置及びそれを用いた蓄電装置に関する技術を開示する。   This specification discloses the technique regarding the electric current interruption apparatus and an electrical storage apparatus using the same.

リチウムイオン電池、ニッケル水素電池、その他の二次電池(蓄電池)等の蓄電装置は、車両搭載用電源、あるいはパソコンおよび携帯端末の電源として重要性が高まっている。特に、リチウムイオン電池は、車両搭載用の高出力電源として用いることが期待されている。リチウムイオン電池は、軽量でありながら高いエネルギー密度が得られる。二次電池の典型的な構造として、ケース内に電極組立体及び電解質が収容されており、そのケースを密閉した密閉構造の電池(密閉型電池)が挙げられる。   Power storage devices such as lithium ion batteries, nickel metal hydride batteries, and other secondary batteries (storage batteries) are becoming increasingly important as on-vehicle power supplies or personal computers and portable terminals. In particular, the lithium ion battery is expected to be used as a high output power source for mounting on a vehicle. Lithium ion batteries are lightweight and can provide a high energy density. A typical structure of a secondary battery includes a battery (sealed battery) having a sealed structure in which an electrode assembly and an electrolyte are housed in a case and the case is sealed.

上記の電池を充電するときに、電池に不具合が生じていたり、充電装置が誤作動したりする場合に、電池に通常以上の電流が流れることがある。その結果、電池が過充電状態になることがある。電池に過充電状態等の異常が生じた場合、密閉されたケース内でガスが発生することがある。ケース内部の圧力が上昇し、ガスの圧力によって電池(ケース)が膨らんだり、ケースが破損したりすることが起こり得る。このような不具合に対策するために、電流遮断装置を備えた電池が提案されている(例えば、特許文献1)。   When charging the battery, if the battery is defective or the charging device malfunctions, a current greater than normal may flow through the battery. As a result, the battery may be overcharged. When an abnormality such as an overcharged state occurs in the battery, gas may be generated in the sealed case. The pressure inside the case increases, and the battery (case) may swell or the case may be damaged by the gas pressure. In order to cope with such a problem, a battery including a current interrupt device has been proposed (for example, Patent Document 1).

特許文献1に記載された二次電池は、発電要素である捲回群を納める電池容器と、捲回群に接続される集電体と、電池容器に取付けられた電極端子と電極端子と集電体とを接続する通電経路に配置された電流遮断弁を備えている。電池容器内の圧力が所定の遮断圧に達すると電流遮断弁が反転し、電流遮断弁と集電体とが分離して通電経路が遮断される。   The secondary battery described in Patent Document 1 includes a battery container that houses a wound group as a power generation element, a current collector connected to the wound group, an electrode terminal attached to the battery container, an electrode terminal, and a collector. A current cutoff valve is provided in the energization path connecting the electric body. When the pressure in the battery container reaches a predetermined cutoff pressure, the current cutoff valve is reversed, the current cutoff valve and the current collector are separated, and the energization path is cut off.

特開 2012−28008号公報JP 2012-28008 A

電流遮断装置を備える蓄電装置では、電流遮断装置が動作すると、通電経路を構成する部材が電極端子側の部材と発電要素側の部材とに切り離される。この状態で、電極端子側の部材と発電要素側の部材との間に高電圧が作用すると、スパークにより当該部材間が再導通する虞がある。本明細書では、電流遮断装置の動作後に電極端子側の部材と発電要素側の部材との間に高電圧が作用しても、両者間が再導通することを抑制することができる技術を提供する。   In a power storage device including a current interrupt device, when the current interrupt device operates, members constituting the energization path are separated into a member on the electrode terminal side and a member on the power generation element side. In this state, if a high voltage is applied between the electrode terminal side member and the power generation element side member, there is a possibility that the member is re-conducted by the spark. In this specification, even if a high voltage acts between a member on the electrode terminal side and a member on the power generation element side after the operation of the current interrupting device, a technique capable of suppressing re-conduction between the two is provided. To do.

本明細書で開示する電流遮断装置は、正極及び負極を備える電極組立体と正極外部端子もしくは負極外部端子とを電気的に接続し、電極組立体を収容するケース内の内圧が所定レベルを超えて上昇した際に電極組立体と正極外部端子又は負極外部端子との通電経路を遮断する。電流遮断装置は、ケース内の内圧が所定レベルを超えて上昇した際に変形する変形板と、通電経路を構成する通電板と、通電経路を構成する接点板を備えている。通電板は、接点板と接触する第1接点部を含んでおり、接点板は、第1接点部と接触する第2接点部を含んでおり、第1接点部と第2接点部は、通電経路上に設けられており、変形板は、ケース内の内圧を受圧可能な受圧部と、第1接点部及び第2接点部の少なくとも一方に接触可能な当接部を含んでおり、当接部が接点板側へ移動するように変形板が変形することにより、第1接点部及び第2接点部の内、少なくとも第2接点部が通電板と分離可能であり、通電板が、変形板と接点板に挟まれるように配置される。電流遮断装置の内部には、電流遮断装置の外部から隔離され、かつ絶縁ガスが封入された封入空間が形成され、第2接点部と通電板とが分離した後の状態では、その分離箇所が封入空間内に位置し、分離箇所の間に絶縁ガスが存在する。   The current interrupting device disclosed in this specification electrically connects an electrode assembly including a positive electrode and a negative electrode to a positive electrode external terminal or a negative electrode external terminal, and an internal pressure in a case housing the electrode assembly exceeds a predetermined level. When it rises, the energization path between the electrode assembly and the positive external terminal or the negative external terminal is interrupted. The current interrupting device includes a deforming plate that deforms when the internal pressure in the case rises above a predetermined level, an energizing plate that constitutes an energizing path, and a contact plate that constitutes an energizing path. The energization plate includes a first contact portion that contacts the contact plate, the contact plate includes a second contact portion that contacts the first contact portion, and the first contact portion and the second contact portion are energized. The deformation plate is provided on the path, and includes a pressure receiving portion capable of receiving the internal pressure in the case, and a contact portion capable of contacting at least one of the first contact portion and the second contact portion. The deformation plate is deformed so that the portion moves toward the contact plate, so that at least the second contact portion of the first contact portion and the second contact portion can be separated from the energization plate. And are arranged so as to be sandwiched between contact plates. Inside the current interrupting device, an enclosed space is formed that is isolated from the outside of the current interrupting device and in which an insulating gas is enclosed, and in the state after the second contact portion and the energizing plate are separated, the separation location is Insulating gas exists between the separation points, which are located in the enclosed space.

上記の電流遮断装置では、ケース内の内圧が上昇して通電経路が遮断されると、通電経路を構成する部材が少なくとも第2接点部(接点板の第2接点部)と通電板とに分離する。この分離箇所は、絶縁ガスが封入された封入空間内に位置する。よって、第2接点部と通電板の間に高電圧が作用しても、当該部材間におけるスパークの発生が抑制され、両者間が再導通することを抑制することができる。   In the above current interrupting device, when the internal pressure in the case rises and the energizing path is interrupted, the members constituting the energizing path are separated into at least the second contact portion (second contact portion of the contact plate) and the energizing plate. To do. This separation location is located in a sealed space filled with an insulating gas. Therefore, even if a high voltage acts between the second contact portion and the energization plate, the occurrence of sparks between the members can be suppressed, and re-conduction between the two can be suppressed.

蓄電装置の縦断面図。The longitudinal cross-sectional view of an electrical storage apparatus. 蓄電装置が備える電流遮断装置の縦断面図(電流遮断装置が動作していない状態)。The longitudinal cross-sectional view of the electric current interruption apparatus with which an electrical storage apparatus is provided (state which the electric current interruption apparatus does not operate | move). 蓄電装置が備える電流遮断装置の縦断面図(電流遮断装置が動作した状態)。The longitudinal cross-sectional view of the electric current interruption apparatus with which an electrical storage apparatus is equipped (state in which the electric current interruption apparatus operated).

以下、本明細書で開示する蓄電装置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 power storage device disclosed in this specification will be described. The items described below have technical usefulness independently.

(特徴1)第2接点部と通電板とが分離する前の状態では、変形板と通電板の間の第1空間と通電板と接点板の間の第2空間の少なくとも一方が絶縁ガスが封入された封入空間とされてもよい。第2接点板と通電板が分離した後の状態では、第1空間と第2空間が絶縁ガスが封入された封入空間とされてもよい。この構成によれば、封入空間を簡易な構造で備えることができる。 (Characteristic 1) In a state before the second contact portion and the current plate are separated, at least one of the first space between the deformation plate and the current plate and the second space between the current plate and the contact plate is sealed with an insulating gas. It may be a space. In a state after the second contact plate and the energization plate are separated, the first space and the second space may be sealed spaces in which an insulating gas is sealed. According to this configuration, the enclosed space can be provided with a simple structure.

(特徴2)変形板の当接部は、通電板の第1接点部に接触可能であり、通電板には、第1接点部の周囲に溝が設けられてもよい。この場合、変形板が変形すると、通電板が溝の部分で破断して第1接点部及び第2接点部が通電板の溝より外側の部分から分離する。この構成によれば、第2接点部と通電板とが分離する機構を簡易な構造で実現することができる。 (Feature 2) The contact portion of the deformable plate can contact the first contact portion of the energization plate, and the energization plate may be provided with a groove around the first contact portion. In this case, when the deformation plate is deformed, the energization plate is broken at the groove portion, and the first contact portion and the second contact portion are separated from the portion outside the groove of the energization plate. According to this configuration, a mechanism for separating the second contact portion and the energization plate can be realized with a simple structure.

(特徴3)変形板は、負極の材質と同等の性質の材質で製造されてもよい。変形板の材料として、正極(正極集電体)の材料であるアルミニウム又はチタンを用いることなく、負極(負極集電体)の材料である銅系の材料(例えば、りん青銅),ステンレス鋼等を用いることによって、変形板の強度を高くすることができる。 (Characteristic 3) The deformation plate may be made of a material having the same property as the material of the negative electrode. As a material of the deformable plate, a copper-based material (for example, phosphor bronze) that is a material of the negative electrode (negative electrode current collector) without using aluminum or titanium that is a material of the positive electrode (positive electrode current collector), stainless steel, etc. By using, the strength of the deformation plate can be increased.

なお、蓄電装置としては、密閉型の二次電池、密閉型のキャパシタ等が挙げられる。二次電池の一例としては、比較的高容量で大電流の充放電が行われる種類の電池、例えば、リチウムイオン電池、ニッケル水素電池、ニッケルカドミウム電池、鉛蓄電池等の二次電池が挙げられる。二次電池の電極組立体の一例として、セパレータを介して対向する電極対(正極電極及び負極電極)を有するセルが複数積層された積層タイプの電極組立体、セパレータを介して対向する電極対を有するシート状のセルが渦巻状に加工された捲回型の電極組立体が挙げられる。   Note that examples of the power storage device include a sealed secondary battery and a sealed capacitor. As an example of the secondary battery, a secondary battery such as a lithium ion battery, a nickel hydride battery, a nickel cadmium battery, or a lead storage battery can be used. As an example of an electrode assembly of a secondary battery, a stacked type electrode assembly in which a plurality of cells having electrode pairs (positive electrode and negative electrode) opposed via a separator are stacked, and an electrode pair opposed via a separator Examples thereof include a wound electrode assembly in which a sheet-like cell having a spiral shape is processed.

以下、蓄電装置の一実施例について説明する。本実施例の蓄電装置は、例えば車両に搭載され、車両走行用のモータに電力を供給することができる。   Hereinafter, an embodiment of the power storage device will be described. The power storage device of the present embodiment is mounted on a vehicle, for example, and can supply electric power to a vehicle driving motor.

図1に示すように、蓄電装置1は、ケース3と、電極組立体5と、負極端子7と、正極端子9と、電流遮断装置11を備えている。ケース3は、一端面が開口する矩形箱状の本体部分13と、本体部分13の一端の開口を閉塞する矩形平板状の蓋部材15を備えている。本体部分13及び蓋部材15は、金属製(例えば、ステンレス、アルミニウム)である。以下の説明では、本体部分13及び蓋部材15を単にケース3と称する。ケース3の内部空間17には、正極電極及び負極電極を備える電極組立体5が収容されている。ケース3と電極組立体5は絶縁シート19によって絶縁されている。正極タブ21が、正極電極に固定されている。負極タブ23が、負極電極に固定されている。   As shown in FIG. 1, the power storage device 1 includes a case 3, an electrode assembly 5, a negative electrode terminal 7, a positive electrode terminal 9, and a current interrupt device 11. The case 3 includes a rectangular box-shaped main body portion 13 whose one end surface is open, and a rectangular flat plate-shaped lid member 15 that closes one end of the main body portion 13. The main body portion 13 and the lid member 15 are made of metal (for example, stainless steel or aluminum). In the following description, the main body portion 13 and the lid member 15 are simply referred to as the case 3. An electrode assembly 5 including a positive electrode and a negative electrode is accommodated in the internal space 17 of the case 3. The case 3 and the electrode assembly 5 are insulated by an insulating sheet 19. A positive electrode tab 21 is fixed to the positive electrode. A negative electrode tab 23 is fixed to the negative electrode.

負極端子7及び正極端子9が、ケース3(蓋部材15)に固定されている。負極端子7とケース3の間、及び正極端子9とケース3の間は、絶縁シート等により絶縁されている。負極端子7は、電流遮断装置11、負極リード25を介して、負極タブ23(負極電極)に電気的に接続している。電流遮断装置11と負極リード25は、導電性を有する接続部材29によって接続されている。電流遮断装置11の詳細は後述する。なお、正極端子9は、正極リード27を介して正極タブ21(正極電極)に電気的に接続している。負極リード25および正極リード27はケース3(蓋部材15)に取り付けられている絶縁シート31によって、ケース3と絶縁されている。なお、本実施例の蓄電装置1では、負極端子7と電流遮断装置11とが一体化された構成となっている(後に詳しく説明する)。   The negative electrode terminal 7 and the positive electrode terminal 9 are fixed to the case 3 (lid member 15). The negative electrode terminal 7 and the case 3 and the positive electrode terminal 9 and the case 3 are insulated by an insulating sheet or the like. The negative electrode terminal 7 is electrically connected to the negative electrode tab 23 (negative electrode) through the current interrupt device 11 and the negative electrode lead 25. The current interrupt device 11 and the negative electrode lead 25 are connected by a connecting member 29 having conductivity. Details of the current interrupt device 11 will be described later. The positive electrode terminal 9 is electrically connected to the positive electrode tab 21 (positive electrode) via the positive electrode lead 27. The negative electrode lead 25 and the positive electrode lead 27 are insulated from the case 3 by an insulating sheet 31 attached to the case 3 (lid member 15). In addition, in the electrical storage apparatus 1 of a present Example, it has the structure by which the negative electrode terminal 7 and the electric current interruption apparatus 11 were integrated (it demonstrates in detail later).

図2及び図3を参照し、電流遮断装置11について説明する。なお、図2、3では、電極組立体5(図1を参照)の図示を省略している。   With reference to FIG.2 and FIG.3, the electric current interruption apparatus 11 is demonstrated. 2 and 3, the electrode assembly 5 (see FIG. 1) is not shown.

電流遮断装置11の構造を、蓄電装置1のケース3の内部(図2の下方)からケース3の外部(図2の上方)に向けて順に説明する。電流遮断装置11は、変形板41と、通電板43と、接点板45を備えている。変形板41は、ケース3内の内圧を受ける受圧部47を有している。通電板43は、電極組立体5と電気的に接続されている。通電板43は導電性の金属で作られており、その略中央に、溝(破断溝49)が環状に設けられている。破断溝49で囲まれた部分は第1接点部51と称する。接点板45も導電性の金属で作られており、その一部が第1接点部51と接触している。接点板45において第1接点部51と接触している部分は第2接点部53と称する。変形板41は、電流遮断装置11の外郭部分に配置され、電流遮断装置11の外面を形成している。通電板43、接点板45は、夫々変形板41の内側に配置されている。   The structure of the current interrupt device 11 will be described in order from the inside of the case 3 of the power storage device 1 (downward in FIG. 2) to the outside of the case 3 (upward in FIG. 2). The current interrupt device 11 includes a deformation plate 41, a current supply plate 43, and a contact plate 45. The deformation plate 41 has a pressure receiving portion 47 that receives the internal pressure in the case 3. The energization plate 43 is electrically connected to the electrode assembly 5. The energizing plate 43 is made of a conductive metal, and a groove (breaking groove 49) is provided in an annular shape in the approximate center. A portion surrounded by the fracture groove 49 is referred to as a first contact portion 51. The contact plate 45 is also made of a conductive metal, and a part of the contact plate 45 is in contact with the first contact portion 51. A portion of the contact plate 45 that is in contact with the first contact portion 51 is referred to as a second contact portion 53. The deformation plate 41 is disposed in the outer portion of the current interrupt device 11 and forms the outer surface of the current interrupt device 11. The energizing plate 43 and the contact plate 45 are arranged inside the deformation plate 41, respectively.

変形板41は、円形状の薄板(例えば金属性のダイアフラム)からなる。変形板は、通電板43の下方に配置され、外周部で通電板43と接合されている。また、変形板41は、外周部を後述する絶縁性の支持部材55に固定されている。変形板41の中央には、接点板45側に向けて突出する絶縁性の突起57が設けられている。突起57は、例えば、円筒状をなしている。突起57の直上には、第1接点部51が位置している。変形板41の受圧部47がケース3内の圧力を受けると、変形板41はケース3の外方に向けて変形する。すると、突起57の当接部59が第1接点部51に当接する。この時、当接部59から第1接点部51に衝撃が与えられる。この衝撃により、第1接点部51および第2接点部53が通電板43から分離するようになっている。   The deformation plate 41 is a circular thin plate (for example, a metallic diaphragm). The deformable plate is disposed below the energizing plate 43 and joined to the energizing plate 43 at the outer peripheral portion. Further, the deformable plate 41 has an outer peripheral portion fixed to an insulating support member 55 described later. An insulating protrusion 57 is provided at the center of the deformation plate 41 so as to protrude toward the contact plate 45 side. The protrusion 57 has a cylindrical shape, for example. The first contact portion 51 is located immediately above the protrusion 57. When the pressure receiving portion 47 of the deformation plate 41 receives the pressure in the case 3, the deformation plate 41 is deformed toward the outside of the case 3. Then, the contact portion 59 of the protrusion 57 contacts the first contact portion 51. At this time, an impact is applied from the contact portion 59 to the first contact portion 51. Due to this impact, the first contact portion 51 and the second contact portion 53 are separated from the energizing plate 43.

変形板41は、組立時あるいはケース3内の圧力が通常の圧力である場合は、ケース3の内方に凸の状態となっている。このため、変形板41がケース3内の圧力上昇によりケース3の外方に向けて変形をする際には、外周部の支持点を超えて変形し、反転することができる。これによって、変形板41の変形時におけるストローク(変位量)を十分に確保することができる。   The deformable plate 41 is convex inward of the case 3 at the time of assembly or when the pressure in the case 3 is a normal pressure. For this reason, when the deformation | transformation board 41 deform | transforms outward of the case 3 by the pressure rise in the case 3, it can deform | transform beyond the support point of an outer peripheral part, and can be reversed. Thereby, the stroke (displacement amount) when the deformation plate 41 is deformed can be sufficiently secured.

通電板43は円形状の部材である。通電板43は下方に変形板41が配置され、上方に接点板45が配置されている。通電板43は、外周部の一部に、電極組立体5と電気的に接続される接続部材29を備えている。接続部材29の設けられていない外周部は支持部材55により支持されている。通電板43は、変形板41と対向する面が上方に窪んでいる。具体的には、通電板41の上面が水平に形成されると共に、通電板43の中央部が周辺部に比べ薄く形成されている。これによって、通電板43の下面の中央が上方に凹となっている。通電板43の中央には第1接点部51が設けられ、第1接点部51の周囲には破断溝49が形成されている。通電板43及び変形板41を平面視すると、破断溝49の外周は当接部59の外周よりも大きく形成されている。破断溝49は、連続あるいは不連続に形成される。また、本実施例では、破断溝49の断面形状は上方に凸の三角形状であるが、その形状は、特に三角形状に限定されない。   The energizing plate 43 is a circular member. The energizing plate 43 has a deformable plate 41 disposed below and a contact plate 45 disposed above. The energization plate 43 includes a connection member 29 that is electrically connected to the electrode assembly 5 at a part of the outer periphery. The outer peripheral portion where the connection member 29 is not provided is supported by a support member 55. A surface of the energizing plate 43 facing the deformation plate 41 is recessed upward. Specifically, the upper surface of the energizing plate 41 is formed horizontally, and the central portion of the energizing plate 43 is formed thinner than the peripheral portion. As a result, the center of the lower surface of the energizing plate 43 is recessed upward. A first contact portion 51 is provided at the center of the energizing plate 43, and a fracture groove 49 is formed around the first contact portion 51. When the energization plate 43 and the deformation plate 41 are viewed in plan, the outer periphery of the fracture groove 49 is formed larger than the outer periphery of the contact portion 59. The fracture groove 49 is formed continuously or discontinuously. In this embodiment, the cross-sectional shape of the fracture groove 49 is a triangular shape protruding upward, but the shape is not particularly limited to a triangular shape.

接点板45は、導電性の平板形状の薄板(例えば、導電性金属のダイアフラム)からなる。接点板45は通電板43の上方に配置されている。電流遮断装置11が作動していない状態では、接点板45は下方に凸の状態で配置されている。接点板45の外周部は、負極端子7に接続されている。接点板45の中央部には第2接点部53が設けられ、第2接点部53は第1接点部51と接続されている。第1接点部51と第2接点部53の接続は、例えば、溶着等により固着されている。また、接点板45の外周部と通電板43の外周部の間には絶縁部材65が備えられ、両者の外周部は電気的に絶縁されている。   The contact plate 45 is made of a conductive flat thin plate (for example, a conductive metal diaphragm). The contact plate 45 is disposed above the energizing plate 43. When the current interrupt device 11 is not in operation, the contact plate 45 is arranged in a convex state downward. The outer periphery of the contact plate 45 is connected to the negative terminal 7. A second contact portion 53 is provided at the center of the contact plate 45, and the second contact portion 53 is connected to the first contact portion 51. The connection between the first contact portion 51 and the second contact portion 53 is fixed by, for example, welding. Further, an insulating member 65 is provided between the outer peripheral portion of the contact plate 45 and the outer peripheral portion of the energizing plate 43, and the outer peripheral portions of both are electrically insulated.

負極端子7は、円筒部60と本体部61を有する。円筒部60はケース3の外方に露出している。円筒部60の下方には、本体部61が同心円状に位置している。本体部61は円板形状であり、その径は円筒部60の径より大きく形成されている。負極端子7は接点板45の上方に配置されている。本体部61の外周部は接点板45の外周部と接続されている。本体部61の外周部は支持部材55により支持されている。これにより、負極端子7は電流遮断装置11と一体化されている。また、負極端子7の接点板45と対向する面(本体部61の下面)は上方に窪んだ凹部63を有している。凹部63は、変形板41による接点板45の上方への変形を許容するための空間を形成している。   The negative terminal 7 has a cylindrical part 60 and a main body part 61. The cylindrical portion 60 is exposed outside the case 3. Below the cylindrical part 60, the main body part 61 is located concentrically. The main body portion 61 has a disc shape, and the diameter thereof is larger than the diameter of the cylindrical portion 60. The negative terminal 7 is disposed above the contact plate 45. The outer peripheral portion of the main body 61 is connected to the outer peripheral portion of the contact plate 45. The outer peripheral portion of the main body 61 is supported by a support member 55. Thereby, the negative electrode terminal 7 is integrated with the current interrupt device 11. Further, the surface of the negative electrode terminal 7 facing the contact plate 45 (the lower surface of the main body portion 61) has a concave portion 63 that is recessed upward. The recess 63 forms a space for allowing the deformation plate 41 to deform the contact plate 45 upward.

絶縁性の支持部材55は、例えば、樹脂モールドで成形される。支持部材55は縦断面(すなわち、図2,3に示す断面)が略U字状で、平面視がリング状に形成される。この略U字状の内面に、変形板41の外周部と通電板43の外周部と本体部61の外周部が位置している。支持部材55によって、変形板41と通電板43と接点板45及び負極電極7が一体に保持されている。支持部材55の外面には、金属製の板材67が覆っている。板材67を塑性変形させ、支持部材55を圧縮させることで、上記部品の保持が確実なものなる。なお、本実施例においては、変形板41と通電板43と接点板45を保持している支持部材55及び板材67の外側の空間が「電流遮断装置11の外部」に相当する。すなわち、電流遮断装置の外郭を構成する部材の外側の空間が「電流遮断装置の外部」に相当する。   The insulating support member 55 is formed by, for example, a resin mold. The support member 55 has a substantially U-shaped vertical cross section (that is, a cross section shown in FIGS. 2 and 3) and a ring shape in plan view. On the substantially U-shaped inner surface, the outer peripheral portion of the deformation plate 41, the outer peripheral portion of the energizing plate 43, and the outer peripheral portion of the main body portion 61 are located. The deformation plate 41, the current supply plate 43, the contact plate 45, and the negative electrode 7 are integrally held by the support member 55. A metal plate 67 covers the outer surface of the support member 55. By holding the plate member 67 plastically deforming and compressing the support member 55, the above-mentioned components can be reliably held. In the present embodiment, the space outside the plate member 67 and the support member 55 that holds the deforming plate 41, the energizing plate 43, and the contact plate 45 corresponds to "the outside of the current interrupt device 11". That is, the space outside the members constituting the outline of the current interrupting device corresponds to “outside of the current interrupting device”.

負極端子7の本体部61の外周部と通電板43の外周部の間にはシール部材69が備えられている。シール部材69は円環状の部材である。シール部材69は絶縁部材65の外側に位置し、通電板43及び本体部61の外周部を一巡している。後述する封入空間は、シール部材69により、電流遮断装置11の外部から隔離されている。   A seal member 69 is provided between the outer peripheral portion of the main body portion 61 of the negative electrode terminal 7 and the outer peripheral portion of the energization plate 43. The seal member 69 is an annular member. The seal member 69 is located outside the insulating member 65 and goes around the outer periphery of the energizing plate 43 and the main body 61. A sealed space described later is isolated from the outside of the current interrupt device 11 by a seal member 69.

ここで、電流遮断装置11は内部に3ヶ所の空間71,73,75を有している。空間71,73,75は、変形板41と通電板43の間の第1空間71と、通電板43と接点板45の間の第2空間73と、接点板45と負極端子7(本体部61)の間の第3空間75である。夫々の空間71、73、75はシール部材69及び支持部材55により、電流遮断装置11の外部から隔離されている。   Here, the current interrupt device 11 has three spaces 71, 73, and 75 therein. The spaces 71, 73, and 75 are a first space 71 between the deformation plate 41 and the energization plate 43, a second space 73 between the energization plate 43 and the contact plate 45, the contact plate 45 and the negative electrode terminal 7 (main body portion). 61). Each space 71, 73, 75 is isolated from the outside of the current interrupting device 11 by a seal member 69 and a support member 55.

本実施例では、第1空間71に絶縁ガスが封入されている。絶縁ガスとは、空気に比べ絶縁破壊電圧の高いガスのことをいう。ここで、絶縁破壊電圧とは、ガスの一定距離間に電圧が印加された時に、そのガスの絶縁状態が破られた(スパーク等が起こった)時の電圧のことを表す。つまり、絶縁破壊電圧が高いほど、絶縁体は絶縁破壊に対して高い耐性を有する。例えば、N、NH等からなるガスを絶縁ガスとして用いることができる。絶縁破壊電圧は空気が35.5kV/cmであるのに対して、Nが38kV/cm、NHが55.7kV/cmである。また、それらの混合ガスや代替ガスを用いることもできる。絶縁ガスが封入された第1空間71が封入空間となる。 In this embodiment, an insulating gas is sealed in the first space 71. An insulating gas refers to a gas having a higher dielectric breakdown voltage than air. Here, the dielectric breakdown voltage represents a voltage when the insulation state of the gas is broken (sparking or the like occurs) when a voltage is applied for a certain distance of the gas. That is, the higher the dielectric breakdown voltage, the higher the resistance of the insulator to dielectric breakdown. For example, a gas composed of N 2 , NH 3 or the like can be used as the insulating gas. The breakdown voltage of air is 35.5 kV / cm, while N 2 is 38 kV / cm and NH 3 is 55.7 kV / cm. Moreover, those mixed gas and alternative gas can also be used. The first space 71 in which the insulating gas is sealed becomes the sealed space.

通電経路について説明する。通電板43に接続される接続部材29は、負極リード25を介して、ケース3内部に配置された電極組立体5(図1を参照)と電気的に接続されている。通電板43と接点板45は、第1接点部51と第2接点部53により、電気的に接続されている。接点板45の外周部は、負極端子7の本体部61の外周部と電気的に接続されている。したがって、負極リード25と、接続部材29と、通電板43と、接点板45によって、電極組立体5と負極端子7とをつなぐ通電経路が形成される。   The energization path will be described. The connection member 29 connected to the energization plate 43 is electrically connected to the electrode assembly 5 (see FIG. 1) disposed inside the case 3 via the negative electrode lead 25. The energizing plate 43 and the contact plate 45 are electrically connected by the first contact portion 51 and the second contact portion 53. The outer periphery of the contact plate 45 is electrically connected to the outer periphery of the main body 61 of the negative electrode terminal 7. Therefore, the negative electrode lead 25, the connection member 29, the current supply plate 43, and the contact plate 45 form a current supply path that connects the electrode assembly 5 and the negative electrode terminal 7.

電流遮断装置11は、ケース3内の内圧が所定レベルを超えて上昇したときに、図3に示すように変形板41が変形し、電極組立体5と負極端子7とを接続する通電経路を遮断する。「所定レベルの内圧」とは、蓄電装置1が過充電(過電圧)状態や過昇温状態(活物質の熱暴走温度)となったときのケース3内の内圧を意味する。「所定レベルの内圧」は、蓄電装置1の容量、出力電圧等の条件により設定される。   When the internal pressure in the case 3 rises above a predetermined level, the current interrupting device 11 deforms the deformable plate 41 as shown in FIG. 3 and provides an energization path for connecting the electrode assembly 5 and the negative electrode terminal 7. Cut off. The “predetermined level of internal pressure” means the internal pressure in the case 3 when the power storage device 1 is overcharged (overvoltage) or overheated (thermal runaway temperature of the active material). The “predetermined level of internal pressure” is set according to conditions such as the capacity of the power storage device 1 and the output voltage.

例えば、蓄電装置1が過充電されると、密閉されたケース3の内部でガスが発生し、ケース3の内圧が上昇する。ケース3の内圧が上昇すると、変形板41に作用する上向きの力(変形板41を上方に向けて変形させる力)も増加する。ケース3の内圧が所定レベルを超えて上昇すると、図3に示すように、変形板41が上方に変形(反転)する。変形板41が上方に変形すると、突起57が第1接点部51に衝突する。その衝突により、通電板43が破断溝49を起点として破断する。よって、通電板43の第1接点部51が、通電板43の外周部43aから分離する。通電板43が破断した後も、変形板41の上方への変形は進み、これによって接点板45は上方に変形し、反転状態、あるいは、通電板43と接合される前の状態となる。その結果、負極端子7と電極組立体5との間の通電経路が遮断される。すなわち、蓄電装置1の電流の流れが遮断される。   For example, when the power storage device 1 is overcharged, gas is generated inside the sealed case 3 and the internal pressure of the case 3 increases. When the internal pressure of the case 3 increases, an upward force acting on the deformation plate 41 (a force that deforms the deformation plate 41 upward) also increases. When the internal pressure of the case 3 rises above a predetermined level, the deformation plate 41 is deformed (reversed) upward as shown in FIG. When the deformation plate 41 is deformed upward, the protrusion 57 collides with the first contact portion 51. Due to the collision, the energizing plate 43 breaks starting from the break groove 49. Therefore, the first contact portion 51 of the energization plate 43 is separated from the outer peripheral portion 43 a of the energization plate 43. Even after the energizing plate 43 is broken, the deformation of the deforming plate 41 progresses. As a result, the contact plate 45 is deformed upward and is in a reverse state or a state before being joined to the energizing plate 43. As a result, the energization path between the negative electrode terminal 7 and the electrode assembly 5 is interrupted. That is, the current flow of the power storage device 1 is interrupted.

図3に示すように、電流遮断装置11が動作すると、通電板43は、外周部43aと第1接点部51とに分離する。分離後の通電板43の外周部43aは電極組立体5と電気的に接続され、第1接点部51は負極端子7と電気的に接続されている。また、通電板43が破断溝49で破断することで、外周部43aの内周縁と第1接点部51の外周縁が分離箇所77となる。外周部43aの内周縁と第1接点部51の外周縁が離間するため、第1空間71aと第2空間73aとが連通する。よって、電流遮断装置11が動作する前に第1空間71に封入されていた絶縁ガスは、電流遮断装置11が動作した後では第1空間71aと第2空間73aに存在する。つまり、電流遮断装置11が動作した後では、第1空間71aと第2空間73aが封入空間となり、分離箇所77はこの封入空間71a,73a内に位置する。このため、電極組立体5と負極端子7の間に高電圧が作用した場合でも、封入空間71a,73a内の絶縁ガスにより、第1接点部51と外周部43aの間にスパークが発生することが抑制される。その結果、電流遮断装置11が動作した後に、負極端子7と電極組立体5とが再び導通することが抑制される。   As shown in FIG. 3, when the current interrupt device 11 operates, the energizing plate 43 is separated into the outer peripheral portion 43 a and the first contact portion 51. The outer peripheral portion 43 a of the energized plate 43 after separation is electrically connected to the electrode assembly 5, and the first contact portion 51 is electrically connected to the negative electrode terminal 7. Further, the energizing plate 43 is broken at the breaking groove 49, so that the inner peripheral edge of the outer peripheral portion 43 a and the outer peripheral edge of the first contact portion 51 become the separation portion 77. Since the inner peripheral edge of the outer peripheral portion 43a and the outer peripheral edge of the first contact portion 51 are separated from each other, the first space 71a and the second space 73a communicate with each other. Therefore, the insulating gas sealed in the first space 71 before the current interrupting device 11 operates exists in the first space 71a and the second space 73a after the current interrupting device 11 operates. That is, after the current interrupting device 11 is operated, the first space 71a and the second space 73a become the enclosed space, and the separation portion 77 is located in the enclosed spaces 71a and 73a. For this reason, even when a high voltage acts between the electrode assembly 5 and the negative electrode terminal 7, a spark is generated between the first contact portion 51 and the outer peripheral portion 43a due to the insulating gas in the enclosed spaces 71a and 73a. Is suppressed. As a result, after the current interrupting device 11 is operated, the negative electrode terminal 7 and the electrode assembly 5 are prevented from conducting again.

なお、上述した実施例では、絶縁ガスが第1空間71に封入されていたが、絶縁ガスは第2空間73に封入されていてもよい。また、絶縁ガスは第1空間71と第2空間73の両方に封入されてもよい。このような構成によっても、通電板43の再導通を抑制することができる。なお、第1空間71と第2空間73の両者に絶縁ガスを封入した場合は、電流遮断装置11が動作した後の封入空間の絶縁ガス濃度を上げることができ、よりスパークの発生を抑制することができる。なお、第1空間71と第2空間73の両者に絶縁ガスを封入する場合は、通電板43に連通孔が形成されてもよい。   In the embodiment described above, the insulating gas is sealed in the first space 71, but the insulating gas may be sealed in the second space 73. Further, the insulating gas may be sealed in both the first space 71 and the second space 73. Even with such a configuration, re-conduction of the current supply plate 43 can be suppressed. In addition, when insulating gas is enclosed with both the 1st space 71 and the 2nd space 73, the insulating gas density | concentration of the enclosure space after the electric current interruption apparatus 11 operate | moves can be raised, and generation | occurrence | production of a spark is suppressed more. be able to. In addition, when the insulating gas is sealed in both the first space 71 and the second space 73, a communication hole may be formed in the energization plate 43.

あるいは、接点板45に連通孔が形成され、第2空間73と第3空間75が連通していてもよい。この場合、第2空間73と第3空間75に絶縁ガスを封入することができ、封入できる絶縁ガスの量を増やすことができる。   Alternatively, a communication hole may be formed in the contact plate 45 and the second space 73 and the third space 75 may be communicated. In this case, the insulating gas can be sealed in the second space 73 and the third space 75, and the amount of insulating gas that can be sealed can be increased.

また、変形板41は、負極の材料と同等の性質の材料により形成されていてもよい。従来、変形板の材質として、正極電極(正極集電体)の材料であるアルミニウム又はチタンが用いられていた。変形板の材質としてアルミニウムを用いる場合、変形板の強度が弱くなるという問題があった。また、変形板の材質としてチタンを用いる場合、アルミニウムを用いる場合と比較して変形板が高価になるという問題があった。さらに、変形板の材質としてアルミニウム又はチタンを用いる場合、変形板がクリープして劣化するという問題が起こり得た。この問題が発生する原因は、セル内の温度上昇,ケースの内圧の変動等である。変形板が劣化すると、ケース3の内圧が所定レベルを超えなくても、電流遮断装置が作動するということが起こり得る。すなわち、変形板が劣化すると、電流遮断装置が本来作動する圧力よりも低い圧力で作動することが起こり得る。   Further, the deformable plate 41 may be formed of a material having properties equivalent to those of the negative electrode material. Conventionally, aluminum or titanium, which is a material for the positive electrode (positive electrode current collector), has been used as the material for the deformable plate. When aluminum is used as the material of the deformable plate, there is a problem that the strength of the deformable plate is weakened. Further, when titanium is used as the material of the deformable plate, there is a problem that the deformable plate becomes expensive compared to the case where aluminum is used. Furthermore, when aluminum or titanium is used as the material of the deformable plate, there has been a problem that the deformable plate creeps and deteriorates. The cause of this problem is a rise in temperature in the cell, variation in the internal pressure of the case, and the like. When the deformation plate deteriorates, the current interrupting device may operate even if the internal pressure of the case 3 does not exceed a predetermined level. That is, when the deformation plate deteriorates, it may occur that the current interrupting device operates at a pressure lower than the pressure at which the current interrupting device originally operates.

変形板41の材質として負極電極(負極集電体)の材質と同等の性質を有する材質を用いると、上記したような問題を解決することができる。なお、負極電極の材質としては、銅系の材料,ステンレス鋼が挙げられる。また、「負極電極の材質と同等の性質」とは、負極電極と完全に同一の材料(又は純銅)のみを意味するものではない。例えば、負極電極の材質である銅を主成分とし、他の元素を含む合金等も含まれる。   If a material having the same properties as the material of the negative electrode (negative electrode current collector) is used as the material of the deformation plate 41, the above-described problems can be solved. In addition, as a material of a negative electrode, a copper-type material and stainless steel are mentioned. Further, “a property equivalent to the material of the negative electrode” does not mean only the same material (or pure copper) as the negative electrode. For example, an alloy containing copper, which is the material of the negative electrode, as a main component and containing other elements is also included.

また、電流遮断装置11は、正極外部端子9と電極組立体5の通電経路上に配置してもよい。しかしながら、電流遮断装置11は、上記実施例で示したように、負極外部端子7と電極組立体5の間の通電経路上に配置することがより好ましい。正極電極と負極電極を積層して電極組立体を形成する場合、一般的に、Liの析出を防止するために、正極電極よりも負極電極の方が大きく作られることが多い。したがって、電極組立体と電流遮断装置との距離を短くする場合、電流遮断装置と負極電極とが接触する可能性がある。したがって、電流遮断装置を正極外部端子側に配置すると、電流遮断装置と負極電極とが接触し、蓄電装置が短絡する可能性がある。このため、本実施例のように、電流遮断装置11を負極外部端子7側に配置することが好ましい。   Further, the current interrupt device 11 may be disposed on the energization path between the positive external terminal 9 and the electrode assembly 5. However, it is more preferable that the current interrupt device 11 is arranged on the energization path between the negative external terminal 7 and the electrode assembly 5 as shown in the above embodiment. When an electrode assembly is formed by laminating a positive electrode and a negative electrode, in general, the negative electrode is often made larger than the positive electrode in order to prevent Li precipitation. Therefore, when shortening the distance between the electrode assembly and the current interrupt device, the current interrupt device and the negative electrode may come into contact with each other. Therefore, when the current interrupting device is arranged on the positive electrode external terminal side, the current interrupting device and the negative electrode may come into contact with each other and the power storage device may be short-circuited. For this reason, it is preferable to arrange | position the electric current interruption apparatus 11 to the negative electrode external terminal 7 side like a present Example.

また、上述した実施例では電流遮断装置11と負極端子7が一体化されていたが、夫々が別体で構成されてもよい。つまり、電流遮断装置が負極端子から離間した位置に配置されていてもよい。この場合、接点板45は、他の導電部材を介して負極端子と電気的に接続される。   In the above-described embodiment, the current interrupt device 11 and the negative electrode terminal 7 are integrated, but each may be configured separately. That is, the current interrupt device may be arranged at a position separated from the negative electrode terminal. In this case, the contact plate 45 is electrically connected to the negative electrode terminal via another conductive member.

また、上述した実施例では、正極端子9と負極端子7がケース3の一方向に露出している蓄電装置であったが、本明細書で開示する技術は、円筒型の電池のように、ケースが一方の極性の端子として機能し、他方の極性の端子がケースから絶縁された状態でケースに固定されているタイプの蓄電装置等にも適用することができる。   In the above-described embodiment, the positive electrode terminal 9 and the negative electrode terminal 7 are power storage devices that are exposed in one direction of the case 3, but the technology disclosed in this specification is similar to a cylindrical battery. The present invention can also be applied to a power storage device or the like of a type in which the case functions as a terminal with one polarity and the terminal with the other polarity is insulated from the case.

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。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. 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.

1:蓄電装置
3:ケース
5:電極組立体
7:負極端子
9:正極端子
11:電流遮断装置
41:変形板
43:通電板
45:接点板
49:破断溝
51:第1接点部
53:第2接点部
55:支持部材
57:突起
59:当接部
71、73、75:空間
1: Power storage device 3: Case 5: Electrode assembly 7: Negative electrode terminal 9: Positive electrode terminal 11: Current interrupt device 41: Deformation plate 43: Current supply plate 45: Contact plate 49: Breaking groove 51: First contact portion 53: First 2 contact part 55: support member 57: protrusion 59: contact part 71, 73, 75: space

Claims (6)

正極及び負極を備える電極組立体と正極外部端子もしくは負極外部端子とを電気的に接続し、前記電極組立体を収容するケース内の内圧が所定レベルを超えて上昇した際に前記電極組立体と前記正極外部端子又は前記負極外部端子との通電経路を遮断する電流遮断装置であって、
前記電流遮断装置は、
前記ケース内の内圧が所定レベルを超えて上昇した際に変形する変形板と、
前記通電経路を構成する通電板と、
前記通電経路を構成する接点板と、を備えており、
前記通電板は、前記接点板と接触する第1接点部を含んでおり、
前記接点板は、前記第1接点部と接触する第2接点部を含んでおり、
前記第1接点部と前記第2接点部は、前記通電経路上に設けられており、
前記変形板は、前記ケース内の内圧を受圧可能な受圧部と、前記第1接点部及び前記第2接点部の少なくとも一方に接触可能な当接部を含んでおり、
前記当接部が前記接点板側へ移動するように前記変形板が変形することにより、前記第1接点部及び前記第2接点部の内、少なくとも前記第2接点部が前記通電板と分離可能であり、
前記通電板が、前記変形板と前記接点板に挟まれるように配置され、
前記電流遮断装置の内部には、前記電流遮断装置の外部から隔離され、かつ絶縁ガスが封入された封入空間が形成され、
前記第2接点部と前記通電板とが分離した後の状態では、その分離箇所が前記封入空間内に位置し、前記分離箇所の間に前記絶縁ガスが存在する、電流遮断装置。
An electrode assembly including a positive electrode and a negative electrode is electrically connected to a positive electrode external terminal or a negative electrode external terminal, and when the internal pressure in the case housing the electrode assembly rises above a predetermined level, A current interrupting device that interrupts a current-carrying path with the positive external terminal or the negative external terminal,
The current interrupt device is
A deformation plate that deforms when the internal pressure in the case rises above a predetermined level;
An energization plate constituting the energization path;
A contact plate constituting the energization path,
The energization plate includes a first contact portion that contacts the contact plate,
The contact plate includes a second contact portion that contacts the first contact portion,
The first contact portion and the second contact portion are provided on the energization path,
The deformation plate includes a pressure receiving portion capable of receiving an internal pressure in the case, and a contact portion capable of contacting at least one of the first contact portion and the second contact portion,
By deforming the deformable plate so that the contact portion moves toward the contact plate, at least the second contact portion of the first contact portion and the second contact portion can be separated from the energizing plate. And
The energization plate is disposed so as to be sandwiched between the deformation plate and the contact plate,
Inside the current interrupt device, an enclosed space is formed that is isolated from the outside of the current interrupt device and in which an insulating gas is enclosed,
In a state after the second contact portion and the energization plate are separated, the current interrupting device is such that the separation location is located in the enclosed space and the insulating gas exists between the separation locations.
前記第2接点部と前記通電板とが分離する前の状態では、前記変形板と前記通電板の間の第1空間と前記通電板と前記接点板の間の第2空間の少なくとも一方が前記絶縁ガスが封入された前記封入空間とされ、
前記第2接点部と前記通電板とが分離した後の状態では、前記第1空間及び前記第2空間が前記絶縁ガスが封入された前記封入空間とされる、請求項1に記載の電流遮断装置。
In a state before the second contact portion and the energization plate are separated, at least one of the first space between the deformation plate and the energization plate and the second space between the energization plate and the contact plate is filled with the insulating gas. The enclosed space was
2. The current interruption according to claim 1, wherein, in a state after the second contact portion and the energization plate are separated, the first space and the second space are the sealed space in which the insulating gas is sealed. apparatus.
前記変形板の当接部は、前記通電板の第1接点部に接触可能であり、
前記通電板には、前記第1接点部の周囲に溝が設けられており、
前記変形板が変形すると、前記通電板が前記溝の部分で破断して前記第1接点部及び前記第2接点部が前記通電板の前記溝より外側の部分と分離する、請求項1又は2に記載の電流遮断装置。
The contact portion of the deformation plate can contact the first contact portion of the energization plate,
The energization plate is provided with a groove around the first contact portion,
3. When the deformation plate is deformed, the energization plate is broken at a portion of the groove, and the first contact portion and the second contact portion are separated from a portion outside the groove of the energization plate. The current interrupting device according to 1.
前記変形板は、前記負極の材質と同等の性質の材質であることを特徴とする請求項1から3のいずれか1項に記載の電流遮断装置。   The current interrupting device according to any one of claims 1 to 3, wherein the deformable plate is made of a material having a property equivalent to that of the negative electrode. 請求項1から4のいずれか1項に記載の電流遮断装置を備える蓄電装置。   An electrical storage apparatus provided with the electric current interruption apparatus of any one of Claim 1 to 4. 前記蓄電装置は、二次電池である請求項5に記載の蓄電装置。   The power storage device according to claim 5, wherein the power storage device is a secondary battery.
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