JP2017168262A - Electricity storage element - Google Patents
Electricity storage element Download PDFInfo
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- JP2017168262A JP2017168262A JP2016051316A JP2016051316A JP2017168262A JP 2017168262 A JP2017168262 A JP 2017168262A JP 2016051316 A JP2016051316 A JP 2016051316A JP 2016051316 A JP2016051316 A JP 2016051316A JP 2017168262 A JP2017168262 A JP 2017168262A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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
- Y02E60/13—Energy storage using capacitors
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Abstract
Description
本発明は、内部で発生したガス等を外部に放出可能なガス排出弁を有するケースを備えた蓄電素子に関する。 The present invention relates to a power storage device including a case having a gas discharge valve capable of releasing gas generated inside to the outside.
従来から、裂開によって開弁するガス排出弁を備えた密閉電池が知られている（特許文献１参照）。具体的に、密閉電池は、外装缶と、外装缶の上方開口部を封口する封口板と、を有している。封口板には、図１８に示すように、ガス排出弁１０１が設けられている。このガス排出弁１０１は、中央部を横断するように延びる一本の破断溝１０２を有し、外装缶１０３と封口板１０４とによって画定される密閉電池１００の内部空間の圧力（内圧）が所定値以上になったときに破断溝１０２から裂開し、内部空間内の圧力を開放する。これにより、外装缶１０３等の破裂が防がれる。 Conventionally, a sealed battery including a gas discharge valve that opens by tearing is known (see Patent Document 1). Specifically, the sealed battery includes an outer can and a sealing plate that seals the upper opening of the outer can. The sealing plate is provided with a gas discharge valve 101 as shown in FIG. The gas discharge valve 101 has one fracture groove 102 extending so as to cross the central portion, and the pressure (internal pressure) of the internal space of the sealed battery 100 defined by the outer can 103 and the sealing plate 104 is predetermined. When the value exceeds the value, it breaks off from the fracture groove 102, and the pressure in the internal space is released. Thereby, rupture of the outer can 103 or the like is prevented.
しかし、上記の密閉電池１００では、破断溝１０２の長手方向において密閉電池１００の内圧が上昇したときに生じる応力が集中する部位によって、該破断溝１０２が破断してガス排出弁１０１が裂開するときの内圧（開弁圧）の値が異なる場合、即ち、開弁圧の値がばらつく場合があった。 However, in the sealed battery 100 described above, the fracture groove 102 is broken and the gas discharge valve 101 is cleaved by a portion where stress generated when the internal pressure of the sealed battery 100 increases in the longitudinal direction of the fracture groove 102. In some cases, the value of the internal pressure (valve opening pressure) is different, that is, the value of the valve opening pressure varies.
近年では、密閉電池１００における安全性のさらなる向上のために、開弁圧の値のばらつきが抑えられたガス排出弁１０１が求められている。 In recent years, in order to further improve the safety of the sealed battery 100, there is a demand for a gas discharge valve 101 in which variations in valve opening pressure values are suppressed.
そこで、本実施形態は、開弁圧の値のばらつきが抑えられたガス排出弁を備えた蓄電素子を提供することを目的とする。 Therefore, an object of the present embodiment is to provide a power storage device including a gas discharge valve in which variation in valve opening pressure value is suppressed.
本実施形態の蓄電素子は、
裂開によって開弁するガス排出弁を有する第一壁部と、前記第一壁部の前記ガス排出弁を挟んだ端縁から該第一壁部と交差する方向に広がり且つ互いに平行に配置される一対の第二壁部と、を含むケースを備え、
前記ガス排出弁は、該ガス排出弁の表面に互いに交差する二本の破断溝を有し、
前記二本の破断溝は、前記一対の第二壁部が対向する方向に延びる基準線の上で交差し且つ該基準線とそれぞれ同じ角度で交差する。
The electricity storage device of this embodiment is
A first wall portion having a gas discharge valve that opens by tearing, and an end of the first wall portion sandwiching the gas discharge valve, extending in a direction intersecting the first wall portion and arranged in parallel to each other And a pair of second wall portions,
The gas discharge valve has two fracture grooves intersecting each other on the surface of the gas discharge valve;
The two breaking grooves intersect on a reference line extending in a direction in which the pair of second wall portions face each other, and intersect the reference line at the same angle.
かかる構成によれば、二本の破断溝が基準線の上で交差し且つ基準線とそれぞれ同じ角度で交差しているため、ケースの内圧によって一対の第二壁部が押し広げられたときにガス排出弁に生じる応力（第二壁部の押し広げに起因する応力）が二本の破断溝の交点位置に集中し易くなる。これにより、ガス排出弁において裂開し始める位置（断裂位置）のばらつきが抑えられ、その結果、ガス排出弁における開弁圧の値のばらつきが抑えられる。 According to such a configuration, since the two fractured grooves intersect on the reference line and intersect the reference line at the same angle, when the pair of second wall portions are pushed and expanded by the internal pressure of the case The stress generated in the gas discharge valve (stress caused by the expansion of the second wall portion) is easily concentrated at the intersection of the two fracture grooves. Thereby, the dispersion | variation in the position (rupture position) which begins to tear in a gas discharge valve is suppressed, As a result, the dispersion | variation in the value of the valve opening pressure in a gas discharge valve is suppressed.
前記蓄電素子では、
前記ケースは、前記第一壁部及び前記一対の第二壁部を一部に含んだ直方体形状であって前記一対の第二壁部が対向する方向に薄い直方体形状であってもよい。
In the storage element,
The case may have a rectangular parallelepiped shape partially including the first wall portion and the pair of second wall portions, and may have a thin rectangular parallelepiped shape in a direction in which the pair of second wall portions face each other.
かかる構成によれば、ケースにおいて第二壁部が第一壁部及び第二壁部と直交する壁部（第三壁部）より大きく且つガス排出弁に近いため、ガス排出弁において内圧による第二壁部の押し広げに起因する応力が内圧による第三壁部の押し広げに起因する応力より大きくなり、その結果、ガス排出弁において第二壁部の押し広げに起因する応力が集中し易い交点位置からより裂開し易くなる。 According to this configuration, the second wall portion is larger than the first wall portion and the wall portion (third wall portion) orthogonal to the second wall portion and close to the gas discharge valve in the case. The stress due to the expansion of the second wall is greater than the stress due to the expansion of the third wall due to internal pressure. As a result, the stress due to the expansion of the second wall tends to concentrate in the gas discharge valve. It becomes easier to cleave from the position of the intersection.
前記蓄電素子では、
前記二本の破断溝は、直交していることが好ましい。
In the storage element,
The two breaking grooves are preferably orthogonal.
かかる構成によれば、第二壁部の押し広げに起因する応力が破断溝の交点位置により集中し易くなる。 According to such a configuration, the stress caused by the expansion of the second wall portion is more likely to be concentrated at the intersection position of the fracture groove.
また、前記蓄電素子では、
前記ガス排出弁は、前記第一壁部の法線方向視において前記二本の破断溝の交点を中心とした円形の輪郭を有してもよい。
Further, in the power storage element,
The gas discharge valve may have a circular outline centering on an intersection of the two fractured grooves as viewed in the normal direction of the first wall portion.
かかる構成によれば、ガス排出弁が二本の破断溝の交点を中心とした円形の輪郭を有しているため、第二壁部同士が押し広げられたときに第一壁部を介してガス排出弁に加わる力が、二本の破断溝の一部に偏って加わることが防がれ、これにより、ガス排出弁において第二壁部の押し広げに起因する応力が破断溝の交点位置により集中し易くなる。 According to such a configuration, since the gas discharge valve has a circular outline centering on the intersection of the two breaking grooves, when the second wall portions are spread apart, the first wall portion is interposed. The force applied to the gas discharge valve is prevented from being applied to a part of the two fractured grooves, so that the stress caused by the expansion of the second wall in the gas exhaust valve causes the position of the intersection of the fractured grooves. Makes it easier to concentrate.
また、前記蓄電素子では、
前記ガス排出弁は、前記ケースの外側に向けて球面状に膨出していてもよい。
Further, in the power storage element,
The gas discharge valve may bulge in a spherical shape toward the outside of the case.
かかる構成によれば、ケースの内圧がガス排出弁に加わることで生じる応力がガス排出弁の頂点位置（最も膨出している位置）に集中するが、ガス排出弁の前記頂点位置と二本の破断溝の交点位置とが一致若しくは略一致するため、前記交点位置に第二壁部の押し広げに起因する応力とガス排出弁に内圧が加わることに起因する応力とが集中し、これにより、ガス排出弁が破断溝の交点位置からより裂開し易くなる。 According to such a configuration, the stress generated when the internal pressure of the case is applied to the gas exhaust valve is concentrated at the apex position (the most bulged position) of the gas exhaust valve. Since the intersection position of the fracture groove coincides or substantially coincides, the stress caused by the expansion of the second wall portion and the stress caused by the internal pressure being applied to the gas discharge valve are concentrated at the intersection position. The gas discharge valve can be more easily cleaved from the intersection position of the fracture groove.
また、本実施形態の蓄電素子は、
裂開によって開弁するガス排出弁を有する第一壁部と、前記第一壁部の前記ガス排出弁を挟んだ端縁から該第一壁部と交差する方向に広がり且つ互いに平行に配置される一対の第二壁部と、を含むケースを備え、
前記ガス排出弁は、円形の輪郭を有すると共に、該ガス排出弁の表面に前記円形の中心から該円形の径方向に延びる第一〜第三の破断溝を有し、
前記第一の破断溝は、前記一対の第二壁部が対向する方向に延び且つ前記中心を通る基準線と重なり、
前記第二の破断溝及び前記第三の破断溝は、前記第一の破断溝となす角が鈍角であり、且つ前記基準線を対称軸とした線対称に配置される。
In addition, the electricity storage device of the present embodiment is
A first wall portion having a gas discharge valve that opens by tearing, and an end of the first wall portion sandwiching the gas discharge valve, extending in a direction intersecting the first wall portion and arranged in parallel to each other And a pair of second wall portions,
The gas discharge valve has a circular contour, and has first to third fracture grooves extending in a radial direction from the center of the circle on the surface of the gas discharge valve,
The first breaking groove extends in a direction in which the pair of second wall portions face each other and overlaps a reference line passing through the center,
The second break groove and the third break groove are arranged symmetrically with respect to the first break groove as an obtuse angle and with the reference line as the symmetry axis.
かかる構成によれば、ケースの内圧によって一対の第二壁部が押し広げられたときにガス排出弁に生じる応力（第二壁部の押し広げに起因する応力）が三本の破断溝の合流位置（前記円形の中心）に集中し易くなる。これにより、ガス排出弁において裂開し始める位置（断裂位置）のばらつきが抑えられ、その結果、ガス排出弁における開弁圧の値のばらつきが抑えられる。 According to such a configuration, the stress generated in the gas discharge valve when the pair of second wall portions is expanded by the internal pressure of the case (stress due to the expansion of the second wall portion) is merged by the three breaking grooves. It becomes easy to concentrate on the position (the center of the circle). Thereby, the dispersion | variation in the position (rupture position) which begins to tear in a gas discharge valve is suppressed, As a result, the dispersion | variation in the value of the valve opening pressure in a gas discharge valve is suppressed.
以上より、本実施形態によれば、開弁圧のばらつきが抑えられたガス排出弁を備えた蓄電素子を提供することができる。 As mentioned above, according to this embodiment, the electrical storage element provided with the gas exhaust valve by which the dispersion | variation in valve opening pressure was suppressed can be provided.
以下、本発明の一実施形態について、図１〜図７を参照しつつ説明する。尚、本実施形態の各構成部材（各構成要素）の名称は、本実施形態におけるものであり、背景技術における各構成部材（各構成要素）の名称と異なる場合がある。 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In addition, the name of each component (each component) of this embodiment is a thing in this embodiment, and may differ from the name of each component (each component) in background art.
本実施形態の蓄電素子は、非水電解質二次電池である。より詳しくは、蓄電素子は、リチウムイオンの移動に伴って生じる電子移動を利用したリチウムイオン二次電池である。この種の蓄電素子は、電気エネルギーを供給する。蓄電素子は、単一又は複数で使用される。具体的に、蓄電素子は、要求される出力及び要求される電圧が小さいときには、単一で使用される。一方、蓄電素子は、要求される出力及び要求される電圧の少なくとも一方が大きいときには、他の蓄電素子と組み合わされて蓄電装置に用いられる。前記蓄電装置では、該蓄電装置に用いられる蓄電素子が電気エネルギーを供給する。 The electricity storage device of this embodiment is a nonaqueous electrolyte secondary battery. More specifically, the power storage element is a lithium ion secondary battery that utilizes electron transfer that occurs as lithium ions move. This type of power storage element supplies electrical energy. One or a plurality of power storage elements are used. Specifically, the storage element is used singly when the required output and the required voltage are small. On the other hand, when at least one of a required output and a required voltage is large, the power storage element is used in a power storage device in combination with another power storage element. In the power storage device, a power storage element used in the power storage device supplies electric energy.
蓄電素子は、図１〜図４に示すように、裂開によって開弁するガス排出弁３２１を有するケース３を備える。具体的に、蓄電素子１は、正極２３及び負極２４を含む電極体２と、電極体２を収容するケース３と、ケース３の外側に配置される外部端子４であって電極体２と導通する外部端子４と、を備える。また、蓄電素子１は、電極体２、ケース３、及び外部端子４の他に、電極体２と外部端子４とを導通させる集電体５等も有する。 As shown in FIGS. 1 to 4, the power storage element includes a case 3 having a gas discharge valve 321 that opens by tearing. Specifically, the power storage element 1 includes an electrode body 2 including a positive electrode 23 and a negative electrode 24, a case 3 that houses the electrode body 2, and an external terminal 4 that is disposed outside the case 3, and is electrically connected to the electrode body 2. And an external terminal 4 to be provided. In addition to the electrode body 2, the case 3, and the external terminal 4, the power storage element 1 also includes a current collector 5 that electrically connects the electrode body 2 and the external terminal 4.
電極体２は、正極２３と負極２４とが互いに絶縁された状態で巻芯２１の周囲に巻回されることによって構成される。電極体２においてリチウムイオンが正極２３と負極２４との間を移動することにより、蓄電素子１が充放電する。 The electrode body 2 is configured by being wound around the core 21 in a state where the positive electrode 23 and the negative electrode 24 are insulated from each other. As the lithium ions move between the positive electrode 23 and the negative electrode 24 in the electrode body 2, the power storage device 1 is charged and discharged.
正極２３は、金属箔２３１と、金属箔２３１に積層された正極活物質層２３２と、を有する。金属箔２３１は帯状である。本実施形態の金属箔２３１は、例えば、アルミニウム箔である。 The positive electrode 23 includes a metal foil 231 and a positive electrode active material layer 232 stacked on the metal foil 231. The metal foil 231 has a strip shape. The metal foil 231 of this embodiment is, for example, an aluminum foil.
負極２４は、金属箔２４１と、金属箔２４１に積層された負極活物質層２４２と、を有する。金属箔２４１は帯状である。本実施形態の金属箔２４１は、例えば、銅箔である。 The negative electrode 24 includes a metal foil 241 and a negative electrode active material layer 242 stacked on the metal foil 241. The metal foil 241 has a strip shape. The metal foil 241 of this embodiment is, for example, a copper foil.
本実施形態の電極体２では、以上のように構成される正極２３と負極２４とがセパレータ２５によって絶縁された状態で巻回されている。このセパレータ２５は、絶縁性を有する部材である。具体的に、セパレータ２５は、ポリエチレン、ポリプロピレン、セルロース、ポリアミドなどの多孔質膜によって構成される。セパレータ２５は、正極２３と負極２４との間に配置される。これにより、電極体２において、正極２３と負極２４とが互いに絶縁される。また、セパレータ２５は、上述のように多孔質膜によって構成されているため、ケース３内において電解液を保持する。これにより、蓄電素子１の充放電時において、リチウムイオンが、セパレータ２５を挟んで交互に積層される正極２３と負極２４との間を移動可能となる。 In the electrode body 2 of the present embodiment, the positive electrode 23 and the negative electrode 24 configured as described above are wound in a state where they are insulated by the separator 25. The separator 25 is an insulating member. Specifically, the separator 25 is configured by a porous film such as polyethylene, polypropylene, cellulose, and polyamide. The separator 25 is disposed between the positive electrode 23 and the negative electrode 24. Thereby, in the electrode body 2, the positive electrode 23 and the negative electrode 24 are insulated from each other. Further, since the separator 25 is constituted by the porous film as described above, the separator 25 holds the electrolytic solution in the case 3. Thereby, at the time of charging / discharging of the electrical storage element 1, lithium ions can move between the positive electrode 23 and the negative electrode 24 that are alternately stacked with the separator 25 interposed therebetween.
ケース３は、ガス排出弁３２１を有する蓋板（第一壁部）３２と、蓋板３２のガス排出弁３２１を挟んだ端縁から該蓋板３２と交差する方向に広がり且つ互いに平行な一対の長壁部（第二壁部）３１３と、を含む。また、ケース３は、蓋板３２及び一対の長壁部３１３を一部に含んだ直方体形状であって、一対の長壁部３１３が対向する方向に薄い直方体形状である。このケース３は、具体的には以下の通りである。 The case 3 includes a cover plate (first wall portion) 32 having a gas discharge valve 321 and a pair of cover plates 32 extending in a direction intersecting the cover plate 32 from the end of the cover plate 32 sandwiching the gas discharge valve 321 and parallel to each other. Long wall portion (second wall portion) 313. In addition, the case 3 has a rectangular parallelepiped shape including a cover plate 32 and a pair of long wall portions 313 as a part, and has a thin rectangular parallelepiped shape in a direction in which the pair of long wall portions 313 are opposed to each other. The case 3 is specifically as follows.
ケース３は、開口を有するケース本体３１と、ケース本体３１の開口を塞ぐ（閉じる）蓋板（第一壁部）３２と、を有する。ケース３は、電極体２及び集電体５等と共に、電解液を内部空間３３に収容する。ケース３は、電解液に耐性を有する金属によって形成される。本実施形態のケース３は、例えば、アルミニウム、又は、アルミニウム合金等のアルミニウム系金属材料によって形成される。 The case 3 includes a case main body 31 having an opening and a lid plate (first wall portion) 32 that closes (closes) the opening of the case main body 31. The case 3 houses the electrolytic solution in the internal space 33 together with the electrode body 2 and the current collector 5. Case 3 is formed of a metal having resistance to the electrolytic solution. The case 3 of the present embodiment is formed of an aluminum metal material such as aluminum or an aluminum alloy, for example.
前記電解液は、非水溶液系電解液である。電解液は、有機溶媒に電解質塩を溶解させることによって得られる。有機溶媒は、例えば、プロピレンカーボネート及びエチレンカーボネートなどの環状炭酸エステル類、ジメチルカーボネート、ジエチルカーボネート、及びエチルメチルカーボネートなどの鎖状カーボネート類である。電解質塩は、ＬｉＣｌＯ４、ＬｉＢＦ４、及びＬｉＰＦ６等である。本実施形態の電解液は、プロピレンカーボネート、ジメチルカーボネート、及びエチルメチルカーボネートを、プロピレンカーボネート：ジメチルカーボネート：エチルメチルカーボネート＝３：２：５の割合で調整した混合溶媒に、１ｍｏｌ／ＬのＬｉＰＦ６を溶解させたものである。 The electrolytic solution is a non-aqueous electrolytic solution. The electrolytic solution is obtained by dissolving an electrolyte salt in an organic solvent. Examples of the organic solvent include cyclic carbonates such as propylene carbonate and ethylene carbonate, and chain carbonates such as dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate. The electrolyte salt is LiClO 4 , LiBF 4 , LiPF 6 or the like. The electrolyte solution of this embodiment is prepared by mixing 1 mol / L LiPF 6 in a mixed solvent in which propylene carbonate, dimethyl carbonate, and ethyl methyl carbonate are adjusted at a ratio of propylene carbonate: dimethyl carbonate: ethyl methyl carbonate = 3: 2: 5. Is dissolved.
ケース３は、ケース本体３１の開口周縁部３４と、蓋板３２の周縁部とを重ね合わせた状態で接合することによって形成される。また、ケース３では、ケース本体３１と蓋板３２とによって内部空間３３が画定されている。本実施形態のケース３では、ケース本体３１の開口周縁部３４と蓋板３２の周縁部とが溶接によって接合されている。 The case 3 is formed by joining the opening peripheral edge 34 of the case main body 31 and the peripheral edge of the cover plate 32 in an overlapped state. In the case 3, an internal space 33 is defined by the case main body 31 and the lid plate 32. In the case 3 of this embodiment, the opening peripheral part 34 of the case main body 31 and the peripheral part of the cover plate 32 are joined by welding.
ケース本体３１は、板状の閉塞部３１１と、閉塞部３１１の周縁に接続される筒状の胴部３１２と、を備える。 The case main body 31 includes a plate-like closing part 311 and a cylindrical body part 312 connected to the periphery of the closing part 311.
閉塞部３１１は、開口が上を向くようにケース本体３１が配置されたときに、ケース本体３１の下端に位置する（即ち、前記開口が上を向いたときのケース本体３１の底壁となる）部位である。閉塞部３１１は、該閉塞部３１１の法線方向視において、矩形状である。 The closing portion 311 is located at the lower end of the case main body 31 when the case main body 31 is arranged so that the opening faces upward (that is, it becomes the bottom wall of the case main body 31 when the opening faces upward). ) Part. The blocking part 311 has a rectangular shape when viewed in the normal direction of the blocking part 311.
以下では、閉塞部３１１の長辺方向をＸ軸方向とし、閉塞部３１１の短辺方向をＹ軸方向とし、閉塞部３１１の法線方向をＺ軸方向とする。 Hereinafter, the long side direction of the blocking part 311 is defined as the X-axis direction, the short side direction of the blocking part 311 is defined as the Y-axis direction, and the normal direction of the blocking part 311 is defined as the Z-axis direction.
本実施形態の胴部３１２は、角筒形状、より詳しくは、偏平な角筒形状を有する。胴部３１２は、閉塞部３１１の周縁における長辺から延びる一対の長壁部（第二壁部）３１３と、閉塞部３１１の周縁における短辺から延びる一対の短壁部（第三壁部）３１４とを有する。即ち、一対の長壁部３１３は、Ｙ軸方向に間隔（詳しくは、閉塞部３１１の周縁における短辺に相当する間隔）を空けて対向し、一対の短壁部３１４は、Ｘ軸方向に間隔（詳しくは、閉塞部３１１の周縁における長辺に相当する間隔）を空けて対向する。短壁部３１４が一対の長壁部３１３の対応（詳しくは、Ｙ軸方向に対向）する端部同士をそれぞれ接続することによって、角筒状の胴部３１２が形成される。 The body portion 312 of the present embodiment has a rectangular tube shape, more specifically, a flat rectangular tube shape. The body portion 312 includes a pair of long wall portions (second wall portions) 313 extending from the long side at the peripheral edge of the closing portion 311 and a pair of short wall portions (third wall portion) 314 extending from the short side at the peripheral edge of the closing portion 311. And have. That is, the pair of long wall portions 313 are opposed to each other with an interval in the Y-axis direction (specifically, an interval corresponding to the short side of the periphery of the closing portion 311), and the pair of short wall portions 314 are spaced in the X-axis direction. (In detail, they are opposed to each other with a gap corresponding to the long side of the periphery of the blocking portion 311). By connecting the end portions of the short wall portion 314 corresponding to the pair of long wall portions 313 (specifically, facing each other in the Y-axis direction), a rectangular tube-shaped body portion 312 is formed.
以上のように、ケース本体３１は、開口方向（Ｚ軸方向）における一方の端部が塞がれた角筒形状（即ち、有底角筒形状）を有する。 As described above, the case body 31 has a rectangular tube shape (that is, a bottomed rectangular tube shape) in which one end portion in the opening direction (Z-axis direction) is closed.
蓋板３２は、ケース本体３１の開口を塞ぐ板状の部材である。具体的に、蓋板３２は、ケース本体３１の開口を塞ぐようにケース本体３１に当接する。より具体的には、蓋板３２が開口を塞ぐように、蓋板３２の周縁部がケース本体３１の開口周縁部３４に重ねられる。開口周縁部３４と蓋板３２とが重ねられた状態で、蓋板３２とケース本体３１との境界部が溶接される。これにより、ケース３が構成される。 The lid plate 32 is a plate-like member that closes the opening of the case body 31. Specifically, the cover plate 32 contacts the case body 31 so as to close the opening of the case body 31. More specifically, the peripheral edge of the cover plate 32 is overlapped with the open peripheral edge 34 of the case body 31 so that the cover plate 32 closes the opening. In a state where the opening peripheral edge 34 and the cover plate 32 are overlapped, the boundary portion between the cover plate 32 and the case main body 31 is welded. Thereby, the case 3 is configured.
蓋板３２は、Ｚ軸方向視において、ケース本体３１の開口周縁部３４に対応した輪郭形状を有する。即ち、蓋板３２は、Ｚ軸方向視において、Ｘ軸方向に長い矩形状の板材である。この蓋板３２は、ケース３内のガスを外部に排出可能なガス排出弁３２１を有する。 The cover plate 32 has a contour shape corresponding to the opening peripheral edge 34 of the case body 31 when viewed in the Z-axis direction. That is, the lid plate 32 is a rectangular plate material that is long in the X-axis direction when viewed in the Z-axis direction. The lid plate 32 has a gas discharge valve 321 that can discharge the gas in the case 3 to the outside.
ガス排出弁３２１は、ケース３内において発生したガス等によって内圧が所定の値（開弁圧）まで上昇したときに、裂開することで、該ケース３内から外部にガスを排出する。本実施形態のガス排出弁３２１は、Ｘ軸方向における蓋板３２の中央部に設けられる。即ち、ガス排出弁３２１から蓋板３２のＸ軸方向の一方側の端縁までの距離と、ガス排出弁３２１から蓋板３２のＸ軸方向の他方側の端縁までの距離とが等しい。また、ガス排出弁３２１は、Ｙ軸方向における蓋板３２の中央部に設けられる。即ち、ガス排出弁３２１から蓋板３２のＹ軸方向の一方側の端縁までの距離と、ガス排出弁３２１から蓋板３２のＹ軸方向の他方側の端縁までの距離とが等しい。 The gas discharge valve 321 discharges gas from the case 3 to the outside when the internal pressure rises to a predetermined value (valve opening pressure) due to gas generated in the case 3 or the like. The gas discharge valve 321 of the present embodiment is provided at the center of the lid plate 32 in the X-axis direction. That is, the distance from the gas discharge valve 321 to the edge on one side of the lid plate 32 in the X-axis direction is equal to the distance from the gas discharge valve 321 to the edge on the other side of the lid plate 32 in the X-axis direction. Further, the gas discharge valve 321 is provided at the center of the lid plate 32 in the Y-axis direction. That is, the distance from the gas discharge valve 321 to the edge on one side of the lid plate 32 in the Y-axis direction is equal to the distance from the gas discharge valve 321 to the edge on the other side of the lid plate 32 in the Y-axis direction.
このガス排出弁３２１は、図５〜図７に示すように、その表面（外側表面（ケース３の外側を向いた表面）又は内側表面（ケース３の内側を向いた表面））に破断溝３２１１を有する。具体的に、ガス排出弁３２１は、薄肉部３２１０を有し、薄肉部３２１０は、表面に、互いに交差する二本の破断溝３２１１を有する。また、薄肉部３２１０は、表面における破断溝３２１１を囲む位置に環状溝３２１２も有する。即ち、本実施形態のガス排出弁３２１は、二本の破断溝３２１１と、一つの環状溝３２１２と、を有する。 As shown in FIGS. 5 to 7, the gas discharge valve 321 has a fracture groove 3211 on its surface (outer surface (surface facing the outside of the case 3) or inner surface (surface facing the inner side of the case 3)). Have Specifically, the gas discharge valve 321 has a thin portion 3210, and the thin portion 3210 has two fracture grooves 3211 intersecting each other on the surface. The thin portion 3210 also has an annular groove 3212 at a position surrounding the fracture groove 3211 on the surface. In other words, the gas discharge valve 321 according to this embodiment includes two fracture grooves 3211 and one annular groove 3212.
二本の破断溝３２１１は、Ｙ軸方向に延びる基準線Ｓの上で交差し且つ該基準線Ｓとそれぞれ同じ角度で交差する。即ち、二本の破断溝３２１１は、基準線Ｓ（又は、二本の破断溝の交点を通って基準線Ｓと直交する線）を対称軸とした線対称となるように配置されている。本実施形態の二本の破断溝３２１１は、薄肉部３２１０の外側表面に設けられている。この二本の破断溝３２１１は、Ｚ軸方向視において、直交している。また、二本の破断溝３２１１のそれぞれは、薄肉部３２１０の外側表面において直線状に延びている。各破断溝３２１１は、同じ長さであり、長さ方向の中央位置で互いに交差している。 The two fracture grooves 3211 intersect on the reference line S extending in the Y-axis direction and intersect the reference line S at the same angle. That is, the two breaking grooves 3211 are arranged so as to be line symmetric with respect to the reference line S (or a line passing through the intersection of the two breaking grooves and perpendicular to the reference line S) as an axis of symmetry. The two breaking grooves 3211 of this embodiment are provided on the outer surface of the thin portion 3210. The two breaking grooves 3211 are orthogonal to each other when viewed in the Z-axis direction. In addition, each of the two breaking grooves 3211 extends linearly on the outer surface of the thin portion 3210. Each breaking groove 3211 has the same length and intersects with each other at the center position in the length direction.
薄肉部３２１０は、ケース３における他の部位（ケース３における薄肉部３２１０を除いた部位）よりも薄い部位である。この薄肉部３２１０は、Ｚ軸方向（蓋板３２の法線方向）視において、二本の破断溝３２１１の交点（交点位置３５）を中心とした円形の輪郭を有している。本実施形態の薄肉部３２１０では、破断溝３２１１及び環状溝３２１２が設けられた部位を除いて、厚さが一定である。尚、破断溝３２１１及び環状溝３２１２では、薄肉部３２１０の他の部位より薄くなっている（即ち、厚さ寸法が小さくなっている）。本実施形態の薄肉部３２１０では、破断溝３２１１及び環状溝３２１２が設けられた位置の厚みは、薄肉部３２１０の他の部位の厚みの１／２程度である（図７参照）。 The thin part 3210 is a part thinner than other parts in the case 3 (parts excluding the thin part 3210 in the case 3). The thin portion 3210 has a circular outline centering on the intersection (intersection position 35) of the two fracture grooves 3211 in the Z-axis direction (normal direction of the cover plate 32). In the thin portion 3210 of this embodiment, the thickness is constant except for the portion where the fracture groove 3211 and the annular groove 3212 are provided. In addition, in the fracture | rupture groove | channel 3211 and the annular groove | channel 3212, it is thinner than the other site | part of the thin part 3210 (namely, thickness dimension is small). In the thin portion 3210 of the present embodiment, the thickness of the position where the fracture groove 3211 and the annular groove 3212 are provided is about ½ of the thickness of other portions of the thin portion 3210 (see FIG. 7).
この薄肉部３２１０は、ケース３の外側に向けて球面状に膨出している（図７参照）。詳しくは、薄肉部３２１０は、球面状に膨出している膨出部３２１０Ａと、膨出部３２１０Ａの周縁からＸ−Ｙ面（Ｘ軸とＹ軸とを含む面）方向にフランジ状に広がる平坦部３２１０Ｂと、を有する。上記の二本の破断溝３２１１は、膨出部３２１０Ａに設けられている。本実施形態のガス排出弁３２１では、膨出部３２１０Ａの周縁と、破断溝３２１１の長さ方向の端縁とが同じ位置である。膨出部３２１０Ａの頂点位置（最も膨出している位置）は、Ｚ軸方向において、蓋板３２のガス排出弁３２１を除く他の部位の外側表面よりケース３の内側（内部空間３３の側）に位置している（図７参照）。本実施形態の薄肉部３２１０では、球面状に膨出する薄肉部３２１０（膨出部３２１０Ａ）における頂点位置（最も膨出している位置）が、二本の破断溝３２１１の交点位置３５と一致している。 The thin portion 3210 bulges out spherically toward the outside of the case 3 (see FIG. 7). Specifically, the thin-walled portion 3210 has a bulging portion 3210A that bulges in a spherical shape, and a flat surface that spreads in a flange shape from the periphery of the bulging portion 3210A in the XY plane (a plane that includes the X axis and the Y axis). Part 3210B. The two breaking grooves 3211 are provided in the bulging portion 3210A. In the gas discharge valve 321 of the present embodiment, the peripheral edge of the bulging portion 3210A and the edge in the length direction of the fracture groove 3211 are at the same position. The apex position (the most bulged position) of the bulging portion 3210A is the inner side of the case 3 (the inner space 33 side) from the outer surface of the other part of the lid plate 32 excluding the gas discharge valve 321 in the Z-axis direction. (Refer to FIG. 7). In the thin-walled portion 3210 of this embodiment, the apex position (the most bulged position) of the thin-walled portion 3210 (bulged portion 3210A) that bulges in a spherical shape coincides with the intersection point position 35 of the two breaking grooves 3211. ing.
環状溝３２１２は、薄肉部３２１０における破断溝３２１１が設けられた面と反対側の表面に設けられている。本実施形態の環状溝３２１２は、薄肉部３２１０の内側表面に設けられている。詳しくは、環状溝３２１２は、薄肉部３２１０の平坦部３２１０Ｂの内側表面に設けられている（図７参照）。この環状溝３２１２は、円環状である（図６参照）。この環状溝３２１２が設けられることで、蓄電素子１の過充電等によってケース３の内部でガスが発生して内圧が異常値近傍まで上昇したときに、ガス排出弁３２１が変形し易くなる。これにより、ガス排出弁３２１に生じる応力が二本の破断溝３２１１の交点位置３５により集中し易くなり、ガス排出弁３２１が裂開し始める内圧のバラツキがより抑えられる。 The annular groove 3212 is provided on the surface of the thin portion 3210 opposite to the surface on which the fracture groove 3211 is provided. The annular groove 3212 of this embodiment is provided on the inner surface of the thin portion 3210. Specifically, the annular groove 3212 is provided on the inner surface of the flat portion 3210B of the thin portion 3210 (see FIG. 7). The annular groove 3212 has an annular shape (see FIG. 6). By providing the annular groove 3212, the gas discharge valve 321 is easily deformed when gas is generated inside the case 3 due to overcharging of the power storage element 1 and the internal pressure rises to near the abnormal value. Thereby, the stress generated in the gas discharge valve 321 is easily concentrated at the intersection position 35 of the two fracture grooves 3211, and the variation in the internal pressure at which the gas discharge valve 321 starts to tear is further suppressed.
以上のように構成されるガス排出弁３２１は、ケース３の内圧（ガス圧）が所定の値よりも大きくなったときに、薄肉部３２１０が破断溝３２１１から裂ける（詳しくは、交点位置３５から裂け始め、破断溝３２１１に沿って断裂範囲が広がる）ことによってケース３の内部空間３３と外部空間とを連通させる、即ち、開弁する。これにより、ガス排出弁３２１は、ケース３の内部（内部空間３３）で発生したガスを外部（外部空間）へ排出する。このようにして、ガス排出弁３２１は、上昇したケース３の内部圧力を下げる。 In the gas discharge valve 321 configured as described above, when the internal pressure (gas pressure) of the case 3 becomes larger than a predetermined value, the thin portion 3210 is torn from the fracture groove 3211 (specifically, from the intersection position 35). The internal space 33 and the external space of the case 3 are brought into communication with each other, that is, the valve is opened. Thereby, the gas discharge valve 321 discharges the gas generated inside the case 3 (internal space 33) to the outside (external space). In this way, the gas discharge valve 321 reduces the internal pressure of the raised case 3.
ケース３には、内部空間３３に電解液を注入するための注液穴３２５が設けられる。この注液穴３２５は、蓋板３２をＺ軸方向（厚さ方向）に貫通する。本実施形態の注液穴３２５は、Ｘ軸方向におけるガス排出弁３２１と外部端子４との間に設けられる。このように構成される注液穴３２５は、注液栓３２６によって密閉（封止）される（図３参照）。 The case 3 is provided with a liquid injection hole 325 for injecting an electrolytic solution into the internal space 33. The liquid injection hole 325 penetrates the lid plate 32 in the Z-axis direction (thickness direction). The liquid injection hole 325 of the present embodiment is provided between the gas discharge valve 321 and the external terminal 4 in the X-axis direction. The liquid injection hole 325 configured as described above is sealed (sealed) by the liquid injection stopper 326 (see FIG. 3).
外部端子４は、他の蓄電素子の外部端子又は外部機器等と電気的に接続される部位である。外部端子４は、導電性を有する部材によって形成される。例えば、外部端子４は、アルミニウム又はアルミニウム合金等のアルミニウム系金属材料、銅又は銅合金等の銅系金属材料等の溶接性の高い金属材料によって形成される。外部端子４は、バスバ等が溶接可能な面４１を有する。本実施形態の面４１は、平面である。 The external terminal 4 is a part that is electrically connected to an external terminal of another power storage element or an external device. The external terminal 4 is formed of a conductive member. For example, the external terminal 4 is formed of a highly weldable metal material such as an aluminum-based metal material such as aluminum or an aluminum alloy, or a copper-based metal material such as copper or a copper alloy. The external terminal 4 has a surface 41 to which a bus bar or the like can be welded. The surface 41 of the present embodiment is a flat surface.
集電体５は、ケース３内に配置され、電極体２と通電可能に直接又は間接に接続される。本実施形態の集電体５は、クリップ部材５０を介して電極体２と通電可能に接続される。即ち、蓄電素子１は、電極体２と集電体５とを通電可能に接続するクリップ部材５０を備える。この集電体５は、導電性を有する部材によって形成される。図３に示すように、集電体５は、ケース３の内面に沿って配置される。以上のように構成される集電体５は、蓄電素子１の正極と負極とにそれぞれ配置される。 The current collector 5 is disposed in the case 3 and is directly or indirectly connected to the electrode body 2 so as to be energized. The current collector 5 of the present embodiment is connected to the electrode body 2 through the clip member 50 so as to be energized. That is, the electrical storage element 1 includes a clip member 50 that connects the electrode body 2 and the current collector 5 so as to allow energization. The current collector 5 is formed of a conductive member. As shown in FIG. 3, the current collector 5 is disposed along the inner surface of the case 3. The current collector 5 configured as described above is disposed on each of the positive electrode and the negative electrode of the electricity storage device 1.
正極の集電体５と負極の集電体５とは、異なる材料によって形成される。具体的に、正極の集電体５は、例えば、アルミニウム又はアルミニウム合金によって形成され、負極の集電体５は、例えば、銅又は銅合金によって形成される。 The positive electrode current collector 5 and the negative electrode current collector 5 are formed of different materials. Specifically, the positive electrode current collector 5 is formed of, for example, aluminum or an aluminum alloy, and the negative electrode current collector 5 is formed of, for example, copper or a copper alloy.
また、蓄電素子１は、電極体２とケース３とを絶縁する絶縁部材６等を備える。本実施形態の絶縁部材６は、ケース３（詳しくはケース本体３１）と電極体２との間に配置される。本実施形態の絶縁部材６は、所定の形状に裁断された絶縁性を有するシート状の部材を折り曲げることによって袋状に形成される。 The power storage element 1 includes an insulating member 6 that insulates the electrode body 2 from the case 3. The insulating member 6 of this embodiment is disposed between the case 3 (specifically, the case main body 31) and the electrode body 2. The insulating member 6 of the present embodiment is formed into a bag shape by bending an insulating sheet-like member cut into a predetermined shape.
以上の蓄電素子１によれば、二本の破断溝３２１１が基準線Ｓの上で交差し且つ基準線Ｓとそれぞれ同じ角度で交差しているため、ケース３の内圧によって一対の長壁部３１３が押し広げられたときにガス排出弁３２１に生じる応力（長壁部３１３の押し広げに起因する応力）が二本の破断溝３２１１の交点位置３５に集中し易くなる。これにより、ガス排出弁３２１において裂開し始める位置（断裂位置）のばらつきが抑えられ、その結果、ガス排出弁３２１における開弁圧の値のばらつきが抑えられる。 According to the power storage device 1 described above, since the two fractured grooves 3211 intersect on the reference line S and intersect with the reference line S at the same angle, the pair of long wall portions 313 are formed by the internal pressure of the case 3. The stress generated in the gas discharge valve 321 when it is expanded (stress caused by the expansion of the long wall portion 313) is easily concentrated at the intersection point 35 of the two fracture grooves 3211. As a result, the variation in the position at which the gas discharge valve 321 starts to tear (rupture position) is suppressed, and as a result, the variation in the valve opening pressure value in the gas discharge valve 321 is suppressed.
本実施形態の蓄電素子１では、ケース３がＹ軸方向に薄い直法体形状である。このため、ケース３において長壁部３１３が短壁部３１４より大きく且つガス排出弁３２１に近いため、ガス排出弁３２１において内圧による長壁部３１３の押し広げに起因する応力が内圧による短壁部３１４の押し広げに起因する応力より大きくなる。これにより、ガス排出弁３２１では、長壁部３１３の押し広げに起因する応力が集中し易い交点位置３５からより裂開し易くなる。 In the electricity storage device 1 of the present embodiment, the case 3 has a rectangular shape that is thin in the Y-axis direction. For this reason, since the long wall portion 313 is larger than the short wall portion 314 and close to the gas discharge valve 321 in the case 3, the stress caused by the expansion of the long wall portion 313 by the internal pressure in the gas discharge valve 321 causes stress of the short wall portion 314 due to internal pressure. It becomes larger than the stress caused by spreading. Thereby, in the gas exhaust valve 321, it becomes easy to tear apart from the intersection position 35 where the stress resulting from the expansion of the long wall part 313 tends to concentrate.
また、本実施形態の蓄電素子１では、二本の破断溝３２１１が直交しているため、長壁部３１３の押し広げに起因する応力が破断溝３２１１の交点位置３５により集中し易くなる。 Further, in the power storage device 1 of the present embodiment, since the two breaking grooves 3211 are orthogonal to each other, the stress caused by the expansion of the long wall portion 313 is more likely to be concentrated at the intersection position 35 of the breaking groove 3211.
また、本実施形態の蓄電素子１では、ガス排出弁３２１（詳しくは、薄肉部３２１０）が、Ｚ軸方向視において二本の破断溝３２１１の交点位置（交点）３５を中心とした円形の輪郭を有している。このため、長壁部３１３が押し広げられたときに蓋板３２を介してガス排出弁３２１（薄肉部３２１０）に加わる力が、二本の破断溝３２１１の一部に偏って加わることが防がれる。これにより、ガス排出弁３２１において、長壁部３１３の押し広げに起因する応力が破断溝３２１１の交点位置３５により集中し易くなる。 Further, in the electricity storage device 1 of the present embodiment, the gas discharge valve 321 (specifically, the thin portion 3210) has a circular outline centering on the intersection position (intersection) 35 of the two fracture grooves 3211 when viewed in the Z-axis direction. have. For this reason, the force applied to the gas discharge valve 321 (thin wall portion 3210) via the lid plate 32 when the long wall portion 313 is spread is prevented from being applied to a part of the two fracture grooves 3211. It is. As a result, in the gas discharge valve 321, the stress due to the expansion of the long wall portion 313 is easily concentrated at the intersection position 35 of the fracture groove 3211.
また、本実施形態の蓄電素子１では、ガス排出弁３２１（詳しくは、薄肉部３２１０）がケース３の外側に向けて球面状に膨出している。これにより、ケース３の内圧がガス排出弁３２１に加わることで生じる応力がガス排出弁３２１の頂点位置（最も膨出している位置）に集中するが、ガス排出弁３２１の頂点位置と二本の破断溝３２１１の交点位置３５とが一致若しくは略一致しているため、交点位置３５に長壁部３１３の押し広げに起因する応力とガス排出弁３２１に内圧が加わることに起因する応力とがそれぞれ集中し、その結果、ガス排出弁３２１が破断溝３２１１の交点位置３５からより裂開し易くなる。 Further, in the power storage device 1 of the present embodiment, the gas discharge valve 321 (specifically, the thin wall portion 3210) bulges toward the outside of the case 3 in a spherical shape. As a result, the stress generated when the internal pressure of the case 3 is applied to the gas exhaust valve 321 is concentrated at the apex position (the most bulged position) of the gas exhaust valve 321. Since the intersection position 35 of the fracture groove 3211 coincides with or substantially coincides with the intersection position 35, the stress caused by the expansion of the long wall portion 313 and the stress caused by the internal pressure applied to the gas discharge valve 321 are concentrated at the intersection position 35, respectively. As a result, the gas discharge valve 321 is more easily cleaved from the intersection position 35 of the fracture groove 3211.
尚、本発明の蓄電素子は、上記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。例えば、ある実施形態の構成に他の実施形態の構成を追加することができ、また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることができる。さらに、ある実施形態の構成の一部を削除することができる。 In addition, the electrical storage element of this invention is not limited to the said embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention. For example, the configuration of another embodiment can be added to the configuration of a certain embodiment, and a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment. Furthermore, a part of the configuration of an embodiment can be deleted.
上記実施形態のガス排出弁３２１は、蓋板３２に配置されているが、この構成に限定されない。ガス排出弁３２１は、ケース３が直方体形状であれば、長壁部３１３、短壁部３１４、閉塞部３１１のいずれに配置されてもよい。 Although the gas discharge valve 321 of the said embodiment is arrange | positioned at the cover plate 32, it is not limited to this structure. The gas discharge valve 321 may be disposed in any of the long wall portion 313, the short wall portion 314, and the closing portion 311 as long as the case 3 has a rectangular parallelepiped shape.
また、上記実施形態のガス排出弁３２１では、一対の破断溝３２１１がＺ軸方向視において直交しているが、この構成に限定されない。例えば、図８及び図９に示すように、Ｚ軸方向視において、一対の破断溝３２１１における互いのなす角は、直角でなくてもよい。即ち、一対の破断溝３２１１は、基準線Ｓの上で交差し且つ該基準線Ｓとそれぞれ同じ角度で交差していればよい。 Moreover, in the gas exhaust valve 321 of the said embodiment, although a pair of fracture | rupture groove | channel 3211 is orthogonally crossed in Z-axis direction view, it is not limited to this structure. For example, as shown in FIGS. 8 and 9, the angle between the pair of fracture grooves 3211 does not have to be a right angle when viewed in the Z-axis direction. That is, the pair of fracture grooves 3211 need only intersect on the reference line S and intersect with the reference line S at the same angle.
また、上記実施形態のガス排出弁３２１（薄肉部３２１０）は、ケース３の外側に向けて球面状に膨出しているが、この構成に限定されない。ガス排出弁３２１は、例えば、蓋板３２に沿った平面状でもよく、ケース３の内側に向けて球面状に膨出等していてもよい。 Moreover, although the gas exhaust valve 321 (thin wall part 3210) of the said embodiment bulges spherically toward the outer side of the case 3, it is not limited to this structure. For example, the gas discharge valve 321 may have a planar shape along the lid plate 32, or may bulge in a spherical shape toward the inside of the case 3.
また、上記実施形態のガス排出弁３２１（薄肉部３２１０）は、Ｚ軸方向視において円形の輪郭を有しているが、この構成に限定されない。前記輪郭は、例えば、楕円、レーストラック形状、矩形等であってもよい。 Moreover, although the gas exhaust valve 321 (thin wall part 3210) of the said embodiment has a circular outline in Z-axis direction view, it is not limited to this structure. The outline may be, for example, an ellipse, a racetrack shape, a rectangle, or the like.
上記実施形態の蓄電素子１では、ケース３において、ガス排出弁３２１が一つ設けられているが、この構成に限定されない。複数のガス排出弁３２１がケース３に設けられてもよい。 In the electricity storage device 1 of the above-described embodiment, one gas discharge valve 321 is provided in the case 3, but is not limited to this configuration. A plurality of gas discharge valves 321 may be provided in the case 3.
また、上記実施形態の蓄電素子１では、一対の短壁部（ガス排出弁３２１を有する蓋板３２、及び蓋板３２の縁から該蓋板３２と直交する方向に広がる長壁部３１３と直交する一対の壁部）３１４が平板状で互いに平行であるが、この構成に限定されない。例えば、短壁部３１４は、図１０に示すように、Ｚ軸方向視において湾曲等していてもよい。また、一対の短壁部３１４は、互いに平行でなくてもよい。即ち、ケース３が、ガス排出弁３２１を有する第一壁部（上記実施形態の例では長壁部３１３）と、該第一壁部におけるガス排出弁３２１を挟んだ端縁から該第一壁部（長壁部３１３）と交差する方向に広がり且つ互いに平行に配置される一対の第二壁部（上記実施形態の例では蓋板３２）と、を有していればよい。 In the electricity storage device 1 of the above embodiment, the pair of short wall portions (the cover plate 32 having the gas discharge valve 321 and the long wall portion 313 extending from the edge of the cover plate 32 in the direction orthogonal to the cover plate 32 are orthogonal. The pair of wall portions 314 are flat and parallel to each other, but are not limited to this configuration. For example, the short wall portion 314 may be curved as viewed in the Z-axis direction, as shown in FIG. Further, the pair of short wall portions 314 may not be parallel to each other. That is, the case 3 includes a first wall portion (a long wall portion 313 in the example of the above embodiment) having the gas discharge valve 321 and an edge of the first wall portion sandwiching the gas discharge valve 321. It suffices to have a pair of second wall portions (in the example of the above embodiment, the lid plate 32) that extend in a direction intersecting the (long wall portion 313) and are arranged in parallel to each other.
また、上記実施形態においては、蓄電素子１が充放電可能な非水電解質二次電池（例えばリチウムイオン二次電池）として用いられる場合について説明したが、蓄電素子１の種類や大きさ（容量）は任意である。また、上記実施形態において、蓄電素子１の一例として、リチウムイオン二次電池について説明したが、これに限定されるものではない。例えば、本発明は、種々の二次電池、その他、一次電池や、電気二重層キャパシタ等のキャパシタの蓄電素子にも適用可能である。 Moreover, in the said embodiment, although the case where the electrical storage element 1 was used as a nonaqueous electrolyte secondary battery (for example, lithium ion secondary battery) which can be charged / discharged was demonstrated, the kind and magnitude | size (capacity | capacitance) of the electrical storage element 1 were demonstrated. Is optional. Moreover, in the said embodiment, although the lithium ion secondary battery was demonstrated as an example of the electrical storage element 1, it is not limited to this. For example, the present invention can be applied to various secondary batteries, other primary batteries, and power storage elements of capacitors such as electric double layer capacitors.
蓄電素子（例えば電池）１は、図１１に示すような蓄電装置（蓄電素子が電池の場合は電池モジュール）１１に用いられてもよい。蓄電装置１１は、少なくとも二つの蓄電素子１と、二つの（異なる）蓄電素子１同士を電気的に接続するバスバ部材１２と、を有する。この場合、本発明の技術が少なくとも一つの蓄電素子１に適用されていればよい。 The power storage element (for example, battery) 1 may be used in a power storage device 11 (a battery module when the power storage element is a battery) 11 as shown in FIG. The power storage device 11 includes at least two power storage elements 1 and a bus bar member 12 that electrically connects two (different) power storage elements 1 to each other. In this case, the technique of the present invention only needs to be applied to at least one power storage element 1.
上記実施形態の蓄電素子１では、線対称に配置された二本の破断溝３２１１の対称軸が、基準線Ｓと一致しているが、この構成に限定されない。図１２に示すように、二本の破断溝３２１１が直交している場合には、該二本の破断溝３２１１の対称軸Ｓ１が、基準線Ｓに対して±１５°以内であればよい。このような範囲で基準線Ｓに対して対称軸Ｓ１が傾いていても、ケース３の内圧によって一対の長壁部３１３が押し広げられたときにガス排出弁３２１に生じる応力（第二壁部３１３の押し広げに起因する応力）が二本の破断溝３２１１の交点位置に集中し易くなる。 In the electricity storage device 1 of the above-described embodiment, the symmetry axis of the two fractured grooves 3211 arranged in line symmetry coincides with the reference line S, but is not limited to this configuration. As shown in FIG. 12, when the two fracture grooves 3211 are orthogonal, the symmetry axis S 1 of the two fracture grooves 3211 may be within ± 15 ° with respect to the reference line S. . Be tilted axis of symmetry S 1 with respect to the reference line S in such a range, occurs in the gas discharge valve 321 when the pair of the long wall portion 313 is pushed and widened by the internal pressure of the case 3 Stress (second wall portion The stress caused by the expansion of 313) is likely to concentrate at the intersection of the two fracture grooves 3211.
上記実施形態の蓄電素子１では、二本の破断溝３２１１が薄肉部３２１０の中心（交点位置３５）で交差しているが、この構成に限定されない。例えば、図１３に示すように、Ｚ軸方向から見て円形の輪郭を有する薄肉部３２１０は、中心（交点位置３５）から径方向に延びる三つの破断溝（第一〜第三の破断溝７１〜７３）を有してもよい。具体的には、第一の破断溝７１は、基準線Ｓと一致するように配置される。第二の破断溝７２と第三の破断溝７３とは、Ｚ軸方向から見て第一の破断溝７１となす角α、βが鈍角であり、且つ、基準線Ｓを対称軸として線対称（即ち、α＝βとなる位置）に配置される。 In the electricity storage device 1 of the above embodiment, the two fractured grooves 3211 intersect at the center (intersection position 35) of the thin portion 3210, but are not limited to this configuration. For example, as shown in FIG. 13, the thin portion 3210 having a circular contour when viewed from the Z-axis direction has three breaking grooves (first to third breaking grooves 71) extending in the radial direction from the center (intersection position 35). ~ 73). Specifically, the first fracture groove 71 is arranged so as to coincide with the reference line S. The second breaking groove 72 and the third breaking groove 73 are symmetrical with respect to the first breaking groove 71 as viewed from the Z-axis direction, with the angles α and β being obtuse and having the reference line S as the axis of symmetry. (Ie, a position where α = β).
かかる構成によっても、ケース３の内圧によって一対の長壁部３１３が押し広げられたときにガス排出弁３２１に生じる応力（長壁部３１３の押し広げに起因する応力）が三本の破断溝（第一〜第三の破断溝７１〜７３）の交点位置３５に集中し易くなる。これにより、ガス排出弁３２１において裂開し始める位置（断裂位置）のばらつきが抑えられ、その結果、ガス排出弁３２１における開弁圧の値のばらつきが抑えられる。 Even with such a configuration, the stress generated in the gas discharge valve 321 when the pair of long wall portions 313 is expanded by the internal pressure of the case 3 (stress due to the expansion of the long wall portion 313) is caused by three fracture grooves (first It is easy to concentrate on the intersection position 35 of the third fracture grooves 71 to 73). As a result, the variation in the position at which the gas discharge valve 321 starts to tear (rupture position) is suppressed, and as a result, the variation in the valve opening pressure value in the gas discharge valve 321 is suppressed.
ここで、上記実施形態の蓄電素子１の効果を確認するために、実施例として、図１４に示すような基準線Ｓと対称軸Ｓ１とを一致させたガス排出弁を備えたケースと、図１５に示すような基準線Ｓに対して対称軸Ｓ１を−１５°傾けたガス排出弁を備えたケースと、を準備した。また、比較例として、図１６に示すような基準線Ｓに対して対称軸Ｓ１を−３０°傾けたガス排出弁を備えたケースと、図１７に示すような基準線Ｓに対して対称軸Ｓ１を−４５°傾けたガス排出弁を備えたケースと、を準備した。 Here, in order to confirm the effect of the electricity storage device 1 of the above embodiment, as an example, a case provided with a gas discharge valve in which the reference line S and the symmetry axis S 1 coincide with each other as shown in FIG. a case having a symmetry axis S 1 -15 ° inclined gas discharge valve with respect to the reference line S as shown in FIG. 15 was prepared. As a comparative example, a case having a symmetry axis S 1 -30 ° inclined gas discharge valve with respect to the reference line S as shown in FIG. 16, symmetrically with respect to the reference line S as shown in FIG. 17 a case having a shaft S 1 -45 ° inclined gas discharge valve, was prepared.
尚、各ケースにおいて、ケースの蓋板の幅（図１４〜図１７におけるＹ軸方向の寸法）をｋとしたときに、蓋板の横幅（図１４〜図１７におけるＸ軸方向の寸法）は、８ｋ、薄肉部の厚さは、０．０２７ｋ、薄肉部の直径は、０．６２５ｋ、破断溝の深さは、薄肉部の厚さの３０％、である。 In each case, when the width of the lid plate of the case (dimension in the Y-axis direction in FIGS. 14 to 17) is k, the lateral width of the lid plate (dimension in the X-axis direction in FIGS. 14 to 17) is 8k, the thickness of the thin portion is 0.027k, the diameter of the thin portion is 0.625k, and the depth of the fracture groove is 30% of the thickness of the thin portion.
続いて、ガス排出弁（詳しくは、薄肉部）に対し、裏側（ケースの内部側）から１．０ＭＰａの力が等分布的に印加されるように各ケースの内圧を調整した。その結果を図１４〜図１７に示す。図１４〜図１７の各図において、応力の値の大きな位置を点で示す。即ち、前記点の集中している領域（破断溝内において濃い色の領域）に応力が集中している。 Subsequently, the internal pressure of each case was adjusted such that a force of 1.0 MPa was applied from the back side (inside the case) to the gas discharge valve (specifically, the thin portion) in a uniform manner. The results are shown in FIGS. In each of FIGS. 14 to 17, the position where the stress value is large is indicated by a point. That is, the stress is concentrated in the region where the points are concentrated (the dark color region in the fracture groove).
これらの結果から、二つの破断溝が直交している場合には、基準線Ｓに対して対称軸Ｓ１が、±１５°の範囲内のときに、ガス排出弁に生じる応力が二本の破断溝の交点位置に集中し易くなることが確認できた。 These results, when the two fracture grooves are orthogonal, axis of symmetry S 1 with respect to the reference line S is, when the range of ± 15 °, the stress generated in the gas discharge valve is two of It was confirmed that it was easy to concentrate at the intersection position of the fracture groove.
１…蓄電素子、２…電極体、２１…巻芯、２３…正極、２３１…金属箔、２３２…正極活物質層、２４…負極、２４１…金属箔、２４２…負極活物質層、２５…セパレータ、３…ケース、３１…ケース本体、３１１…閉塞部、３１２…胴部、３１３…長壁部（第二壁部）、３１４…短壁部、３２…蓋板（第一壁部）、３２１…ガス排出弁、３２１０…薄肉部、３２１０Ａ…膨出部、３２１０Ｂ…平坦部、３２１１…破断溝、３２１２…環状溝、３２５…注液穴、３２６…注液栓、３３…内部空間、３４…開口周縁部、３５…交点位置、４…外部端子、４１…面、５…集電体、５０…クリップ部材、６…絶縁部材、１１…蓄電装置、１２…バスバ部材、１００…密閉電池、１０１…ガス排出弁、１０２…破断溝、１０３…外装缶、１０４…封口板、Ｓ…基準線 DESCRIPTION OF SYMBOLS 1 ... Power storage element, 2 ... Electrode body, 21 ... Core, 23 ... Positive electrode, 231 ... Metal foil, 232 ... Positive electrode active material layer, 24 ... Negative electrode, 241 ... Metal foil, 242 ... Negative electrode active material layer, 25 ... Separator DESCRIPTION OF SYMBOLS 3 ... Case, 31 ... Case main body, 311 ... Closure part, 312 ... Trunk part, 313 ... Long wall part (2nd wall part), 314 ... Short wall part, 32 ... Cover plate (1st wall part), 321 ... Gas discharge valve, 3210 ... thin wall portion, 3210A ... bulge portion, 3210B ... flat portion, 3211 ... fracture groove, 3212 ... annular groove, 325 ... liquid injection hole, 326 ... liquid injection stopper, 33 ... internal space, 34 ... opening Peripheral part, 35 ... intersection position, 4 ... external terminal, 41 ... surface, 5 ... current collector, 50 ... clip member, 6 ... insulating member, 11 ... power storage device, 12 ... bus bar member, 100 ... sealed battery, 101 ... Gas discharge valve, 102 ... fracture groove, 103 ... exterior can, 104 ... sealing , S ... reference line
Claims (6)
前記ガス排出弁は、該ガス排出弁の表面に互いに交差する二本の破断溝を有し、
前記二本の破断溝は、前記一対の第二壁部が対向する方向に延びる基準線の上で交差し且つ該基準線とそれぞれ同じ角度で交差する、蓄電素子。 A first wall portion having a gas discharge valve that opens by tearing, and an end of the first wall portion sandwiching the gas discharge valve, extending in a direction intersecting the first wall portion and arranged in parallel to each other And a pair of second wall portions,
The gas discharge valve has two fracture grooves intersecting each other on the surface of the gas discharge valve;
The two breaking grooves intersect each other on a reference line extending in a direction in which the pair of second wall portions face each other, and intersect each reference line at the same angle.
前記ガス排出弁は、円形の輪郭を有すると共に、該ガス排出弁の表面に前記円形の中心から該円形の径方向に延びる第一〜第三の破断溝を有し、
前記第一の破断溝は、前記一対の第二壁部が対向する方向に延び且つ前記中心を通る基準線と重なり、
前記第二の破断溝及び前記第三の破断溝は、前記第一の破断溝となす角が鈍角であり、且つ前記基準線を対称軸とした線対称に配置される、蓄電素子。 A first wall portion having a gas discharge valve that opens by tearing, and an end of the first wall portion sandwiching the gas discharge valve, extending in a direction intersecting the first wall portion and arranged in parallel to each other And a pair of second wall portions,
The gas discharge valve has a circular contour, and has first to third fracture grooves extending in a radial direction from the center of the circle on the surface of the gas discharge valve,
The first breaking groove extends in a direction in which the pair of second wall portions face each other and overlaps a reference line passing through the center,
The storage element, wherein the second break groove and the third break groove are arranged in line symmetry with an angle formed with the first break groove being an obtuse angle and the reference line as a symmetry axis.
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