JP6275621B2 - Construction of container explosion-proof valve - Google Patents

Construction of container explosion-proof valve Download PDF

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JP6275621B2
JP6275621B2 JP2014215335A JP2014215335A JP6275621B2 JP 6275621 B2 JP6275621 B2 JP 6275621B2 JP 2014215335 A JP2014215335 A JP 2014215335A JP 2014215335 A JP2014215335 A JP 2014215335A JP 6275621 B2 JP6275621 B2 JP 6275621B2
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container
explosion
proof valve
breaking groove
inclined side
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JP2016081867A (en
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小西　晴之
晴之 小西
寛子 落合
寛子 落合
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Kobe Steel Ltd
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Kobe Steel Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/40—Safety valves; Equalising valves, e.g. pressure relief valves with a fracturing member, e.g. fracturing diaphragm, glass, fusible joint
    • F16K17/403—Safety valves; Equalising valves, e.g. pressure relief valves with a fracturing member, e.g. fracturing diaphragm, glass, fusible joint with a fracturing valve member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/22—Safety features
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/08—Housing; Encapsulation
    • H01G9/12—Vents or other means allowing expansion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/317—Re-sealable arrangements
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Manufacturing & Machinery (AREA)

Description

本発明は、飲料容器、電解コンデンサ容器や電池容器等の密封構造をなす容器の防爆弁の構造に関するものである。   The present invention relates to a structure of an explosion-proof valve for a container having a sealing structure such as a beverage container, an electrolytic capacitor container, and a battery container.

従来の密封構造をなす容器、例えば、リチウムイオン二次電池の容器においては、電池の充放電や使用環境下の温度上昇によって内部圧力が上昇することがあり、この内部圧力で電池容器が変形したり、さらには破裂する危険性を抱えている。このような電池容器の破裂を防ぐため、破裂しない程度の内部圧力で電池容器の一部が開裂して内部圧力を開放するような防爆弁が設けられている(特許文献１参照)。この防爆弁を低コストに製作するためには、防爆弁を電池容器の蓋と一体に成形することが望ましい(特許文献２参照)。   In a container having a conventional sealed structure, for example, a container of a lithium ion secondary battery, the internal pressure may increase due to charging / discharging of the battery or a temperature increase in the usage environment, and the battery container is deformed by this internal pressure. Or even have the risk of bursting. In order to prevent such rupture of the battery container, an explosion-proof valve is provided in which a part of the battery container is ruptured to release the internal pressure with an internal pressure that does not rupture (see Patent Document 1). In order to manufacture the explosion-proof valve at a low cost, it is desirable to form the explosion-proof valve integrally with the lid of the battery container (see Patent Document 2).

上記特許文献２に記載された防爆弁２０として、塑性加工の一種であるコイニング加工により、図７に示すような電池容器の蓋１０（厚さｔ１（後記図８参照））に蓋１０の周辺部より薄肉に形成された薄肉平坦部３０（厚さｔ２（後記図９参照））と、薄肉平坦部３０に線状に（陸上競技のトラックのように）形成された破断用溝部４０と、を備えた構造のものが知られている。 As the explosion-proof valve 20 described in the above-mentioned Patent Document 2, the lid 10 of the battery container (thickness t 1 (see FIG. 8 described later)) as shown in FIG. A thin flat portion 30 (thickness t 2 (see FIG. 9 described later)) formed thinner than the peripheral portion, and a breaking groove portion 40 formed linearly on the thin flat portion 30 (like a track in an athletics). And a structure having the above-mentioned structure is known.

図８は、図７に示す蓋１０に設けられた防爆弁２０の構造を詳細に示すためのＣＣ断面図である。また、図９は、図８に示す防爆弁２０の構造をより詳細に示すため、曲線オで囲まれた部分を拡大した拡大断面図である。   FIG. 8 is a CC cross-sectional view for showing in detail the structure of the explosion-proof valve 20 provided in the lid 10 shown in FIG. 9 is an enlarged cross-sectional view in which a portion surrounded by a curve O is enlarged in order to show the structure of the explosion-proof valve 20 shown in FIG. 8 in more detail.

図８および図９において、破断用溝部４０は、破断用溝部４０の肉厚を規定している幅Ｗ３の平坦状底部４０ａと、この底部４０ａから薄肉平坦部３０まで立ち上がる対向した傾斜両側壁４０ｃ、４０ｄと、により形成された略Ｖ字形の断面形状（開口部の幅はＷ４）をなしている。そして、傾斜側壁４０ｃの傾斜角度θと傾斜側壁４０ｄの傾斜角度θはともに、これまでから知られている同じ６０度である。 8 and 9, the breaking groove 40 has a flat bottom portion 40a of the width W 3 that defines the thickness of the break groove 40, the inclined side walls opposed rises from the bottom portion 40a to the thin flat portion 30 40c, 40d, and a substantially V-shaped cross-sectional shape (the width of the opening is W 4 ). The inclination angle θ of the inclined side wall 40c and the inclination angle θ of the inclined side wall 40d are both the same 60 degrees that has been known so far.

特開２００９−４２７１号公報JP 2009-4271 A 特開２０１３−２４３０７５号公報JP2013-243075A

しかし、上記特許文献２に記載された破断用溝部４０が形成された場合、図８に示す破断用溝部４０の平坦状底部４０ａの下方（符号クの部分）にくびれが生じてしまうという問題点があった。   However, when the breaking groove 40 described in Patent Document 2 is formed, there is a problem that a constriction occurs below the flat bottom portion 40a of the breaking groove 40 shown in FIG. was there.

発明の目的は、破断用溝部が塑性加工により形成された場合にも、破断用溝部の平坦状底部におけるくびれの発生が防止され、かつ、前記平坦状底部の厚さも安定した容器の防爆弁の構造を提供することにある。   The object of the invention is to prevent the occurrence of constriction in the flat bottom portion of the breaking groove portion even when the breaking groove portion is formed by plastic working, and the explosion-proof valve of the container in which the thickness of the flat bottom portion is stable. To provide a structure.

この目的を達成するために、第１発明に係る容器の防爆弁の構造は、
密封構造をなす容器の防爆弁の構造であって、
前記防爆弁は、
前記容器を構成する表面に、この表面の周辺部より薄肉に形成された薄肉平坦部と、塑性加工により前記薄肉平坦部に線状に形成された破断用溝部と、を備え、
この線状に形成された破断用溝部は、
前記破断用溝部の肉厚を規定している平坦状底部と、この底部から前記薄肉平坦部まで立ち上がる対向した傾斜両側壁と、により形成されたＶ字形の断面形状をなし、
前記傾斜両側壁の一方の傾斜側壁の傾斜角度θ１が他方の傾斜側壁の傾斜角度θ２に比べて大きくなるような構成を有したことを特徴とする容器の防爆弁の構造である。 In order to achieve this object, the structure of the explosion-proof valve of the container according to the first invention is:
An explosion-proof valve structure for a container having a sealed structure,
The explosion-proof valve is
On the surface constituting the container, a thin flat portion formed thinner than the peripheral portion of the surface, and a breaking groove formed linearly in the thin flat portion by plastic processing,
The breaking groove formed in this linear shape is
A V-shaped cross-sectional shape formed by a flat bottom portion defining the thickness of the breaking groove portion and opposing inclined side walls rising from the bottom portion to the thin flat portion,
The inclination angle theta 1 of one inclined side wall of the inclined side walls has a structure of explosion-proof valve of the container, characterized in that it has a larger configuration than the inclination angle theta 2 of the other inclined side wall.

また、第２発明に係る容器の防爆弁の構造は、第１発明に係る容器の防爆弁の構造において、前記線状に形成された破断用溝部は、曲線からなるまたは一部に曲線を含む閉曲線、あるいは、前記閉曲線の一部が不連続となる不連続閉曲線、あるいは、複数の直線が組み合わされたように形成された破断用溝部であることを特徴とする。   Further, the structure of the explosion-proof valve for the container according to the second invention is the structure of the explosion-proof valve for the container according to the first invention, wherein the breaking groove formed in the linear shape is formed of a curve or partially includes a curve. It is a closed curve, a discontinuous closed curve in which a part of the closed curve is discontinuous, or a breaking groove formed as a combination of a plurality of straight lines.

また、第３発明に係る容器の防爆弁の構造は、第１または第２発明に係る容器の防爆弁の構造において、
前記一方の傾斜側壁の傾斜角度θ１が４５〜８０度であり、前記他方の傾斜側壁の傾斜角度θ２が３５〜７０度であることを特徴とする。 Further, the structure of the explosion-proof valve of the container according to the third invention is the structure of the explosion-proof valve of the container according to the first or second invention,
The inclination angle theta 1 of one inclined side wall is 45 to 80 degrees, the inclination angle theta 2 of the other inclined side walls is characterized in that 35 to 70 degrees.

また、第４発明に係る容器の防爆弁の構造は、第１〜第３発明のいずれか１つの発明に係る容器の防爆弁の構造において、
前記容器は、リチウムイオン電池用容器であることを特徴とする。 Moreover, the structure of the explosion-proof valve of the container according to the fourth invention is the structure of the explosion-proof valve of the container according to any one of the first to third inventions,
The container is a container for a lithium ion battery.

以上のように、本発明に係る容器の防爆弁の構造は、
密封構造をなす容器の防爆弁の構造であって、
前記防爆弁は、
前記容器を構成する表面に、この表面の周辺部より薄肉に形成された薄肉平坦部と、塑性加工により前記薄肉平坦部に線状に形成された破断用溝部と、を備え、
この線状に形成された破断用溝部は、
前記破断用溝部の肉厚を規定している平坦状底部と、この底部から前記薄肉平坦部まで立ち上がる対向した傾斜両側壁と、により形成されたＶ字形の断面形状をなし、
前記傾斜両側壁の一方の傾斜側壁の傾斜角度θ１が他方の傾斜側壁の傾斜角度θ２に比べて大きくなるような構成を有しているため、
破断用溝部が塑性加工により形成された場合にも、破断用溝部の平坦状底部におけるくびれの発生が防止され、かつ、前記平坦状底部の厚さも安定した容器の防爆弁の構造を提供することができる。 As described above, the structure of the explosion-proof valve of the container according to the present invention is as follows.
An explosion-proof valve structure for a container having a sealed structure,
The explosion-proof valve is
On the surface constituting the container, a thin flat portion formed thinner than the peripheral portion of the surface, and a breaking groove formed linearly in the thin flat portion by plastic processing,
The breaking groove formed in this linear shape is
A V-shaped cross-sectional shape formed by a flat bottom portion defining the thickness of the breaking groove portion and opposing inclined side walls rising from the bottom portion to the thin flat portion,
Since the inclination angle theta 1 of one inclined side wall of the inclined side walls has a larger configuration than the inclination angle theta 2 of the other inclined side wall,
To provide a structure of an explosion-proof valve for a container in which the occurrence of constriction in the flat bottom portion of the breaking groove portion is prevented and the thickness of the flat bottom portion is stable even when the breaking groove portion is formed by plastic working. Can do.

本発明の実施形態のリチウムイオン電池用容器の防爆弁の構造を示す斜視図である。It is a perspective view which shows the structure of the explosion-proof valve of the container for lithium ion batteries of embodiment of this invention. 図１のＡＡ断面図である。It is AA sectional drawing of FIG. 図２のア部拡大断面図である。FIG. 3 is an enlarged cross-sectional view of a part in FIG. 2. 塑性加工により破断用溝部を形成する場合の破断用溝部周辺箇所（符号イ、ウ）に発生する変形状態および応力状態を模式的に説明する模式説明図である。FIG. 5 is a schematic explanatory view for schematically explaining a deformation state and a stress state generated at locations around the fracture groove portion (symbols a and c) when the fracture groove portion is formed by plastic working. 本発明の別の実施形態の線状に形成された破断用溝部であり、（ａ）は両端の曲線を直線で結びつけたような構成の場合の平面図、（ｂ）は４本の直線が組み合わされたような構成の場合の平面図である。It is the groove part for fracture | rupture formed in the linear form of another embodiment of this invention, (a) is a top view in the case of the structure which connected the curve of both ends with the straight line, (b) is four straight lines. It is a top view in the case of the structure which was combined. 本発明のさらに別の実施形態のリチウムイオン電池用容器の防爆弁の構造を示す斜視図である。It is a perspective view which shows the structure of the explosion-proof valve of the container for lithium ion batteries of another embodiment of this invention. 従来のリチウムイオン電池用容器の防爆弁の構造を示す斜視図である。It is a perspective view which shows the structure of the explosion-proof valve of the conventional container for lithium ion batteries. 図７のＣＣ断面図である。It is CC sectional drawing of FIG. 図８のオ部拡大断面図である。FIG. 9 is an enlarged cross-sectional view of a portion O in FIG. 8. 塑性加工により破断用溝部を形成する場合の破断用溝周辺箇所（符号カ、キ）に発生する変形状態および応力状態を模式的に説明する模式説明図である。FIG. 5 is a schematic explanatory diagram schematically illustrating a deformation state and a stress state generated in a portion around a breaking groove (reference numeral K) when a breaking groove is formed by plastic working.

本発明者らは、如何にすれば、密封構造をなす容器（例えば、リチウムイオン電池用容器）を構成する表面としての蓋の一部（略中央）に、周辺部より薄肉に形成された薄肉平坦部を設けるとともに、その薄肉平坦部にＶ字形の断面形状をなした破断用溝部を塑性加工（例えば、コイニング加工）により線状に形成した場合にも、前記破断用溝部の平坦状底部におけるくびれの発生が防止され、かつ、前記平坦状底部の厚さも安定した容器の防爆弁の構造を提供することができるのか鋭意検討した。   The present inventors, in any way, have a thin wall formed thinner than a peripheral part in a part (substantially center) of a lid as a surface constituting a container (for example, a container for a lithium ion battery) having a sealed structure. Even when a flat groove is provided and a breaking groove having a V-shaped cross-sectional shape is formed linearly by plastic working (for example, coining) in the thin flat portion, the flat bottom of the breaking groove is also formed. It has been intensively investigated whether it is possible to provide a structure of an explosion-proof valve for a container in which the occurrence of constriction is prevented and the thickness of the flat bottom is stable.

その結果、前記平坦状底部から前記薄肉平坦部まで立ち上がる対向した傾斜両側壁と、により形成されるＶ字形の断面形状をなした破断用溝部において、前記傾斜両側壁の一方の傾斜側壁の傾斜角度θ１が他方の傾斜側壁の傾斜角度θ２に比べて大きくなるような構成を有したことで、破断用溝部を塑性加工（コイニング加工）により線状に形成した場合にも、前記破断用溝部の平坦状底部におけるくびれの発生が防止され、かつ、前記平坦状底部の厚さも安定した容器の防爆弁の構造を提供することが可能であることを初めて見出した。 As a result, in the breaking groove having a V-shaped cross-section formed by the opposing inclined side walls rising from the flat bottom portion to the thin flat portion, the inclination angle of one inclined side wall of the inclined side walls Even when the breaking groove is linearly formed by plastic working (coining), the breaking groove has the structure in which θ 1 is larger than the inclination angle θ 2 of the other inclined side wall. It has been found for the first time that it is possible to provide an explosion-proof valve structure for a container in which the occurrence of constriction at the flat bottom of the container is prevented and the thickness of the flat bottom is stable.

なお、この見出された結果は、リチウムイオン電池用容器の防爆弁の構造にのみ限定されるものではなく、飲料容器や電解コンデンサ容器等の密封構造をなす容器の防爆弁の構造にも広く適用可能である。以下、本発明について、リチウムイオン電池用容器の防爆弁の構造の場合を例示しつつ、実施形態を詳細に説明する。   The found results are not limited only to the structure of the explosion-proof valve of the container for lithium ion batteries, but are also widely applied to the structure of the explosion-proof valve of a container having a sealed structure such as a beverage container or an electrolytic capacitor container. Applicable. Hereinafter, embodiments of the present invention will be described in detail while illustrating the case of the structure of an explosion-proof valve for a lithium ion battery container.

（実施形態）
図１は本発明の実施形態のリチウムイオン電池用容器の防爆弁の構造を示す斜視図、図２は図１のＡＡ断面図、図３は図２のア部拡大断面図である。 (Embodiment)
1 is a perspective view showing the structure of an explosion-proof valve of a container for a lithium ion battery according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG.

図１〜図３において、１はリチウムイオン電池用容器の蓋、１ａ、１ｂ、１ｃ、１ｄは蓋１の側壁、２は蓋１の略中央に設けられた防爆弁、３は防爆弁２を構成する要素であり、蓋１の周辺部より薄肉に形成された薄肉平坦部、３ａは蓋１の表面に向けて外方に広がる傾斜壁、４は防爆弁２を構成する要素であり、薄肉平坦部３に塑性加工の一種であるコイニング加工により線状に形成した破断用溝部である。   1 to 3, 1 is a lid of a lithium ion battery container, 1 a, 1 b, 1 c, and 1 d are side walls of the lid 1, 2 is an explosion-proof valve provided substantially at the center of the lid 1, and 3 is an explosion-proof valve 2. A thin flat portion formed thinner than the peripheral portion of the lid 1, 3a is an inclined wall extending outward toward the surface of the lid 1, 4 is an element constituting the explosion-proof valve 2, and is thin It is a breaking groove formed in a linear shape on the flat portion 3 by coining which is a kind of plastic working.

携帯電話やノート型パーソナルコンピュータあるいは自動車用等の電源として用いられるリチウムイオン電池用容器の蓋１としては、アルミニウム合金薄板を成形素材として、その厚さｔ１が０．５〜２ｍｍの範囲であるのが好ましい。蓋１の厚さｔ１が０．５ｍｍ未満では、リチウムイオン電池蓋用の素材として広く使われる１０００系あるいは３０００系のアルミニウム合金薄板を蓋１の素材として用いたとしても、蓋１として要求される剛性や強度が不足する。一方、蓋１の厚さｔ１が２ｍｍを超えると、電池容器本体をアルミニウム合金薄板としても、重量が重くなるとともに、厚さが厚くなって、上記薄肉平坦部３や破断用溝部４から構成される防爆弁２の精度の良い加工が難しくなる。さらに、破断用溝部４をコイニング加工により形成する際の、蓋１のたわみの不均一性の発生や破断用溝部４の平坦状底部４ａにおけるくびれの発生が防止され、かつ、前記平坦状底部４ａの厚さを安定させる等の加工性や耐食性等を総合に考慮すると、蓋１は耐力が３０〜１３０ＭＰａの１０００系あるいは３０００系のアルミニウム合金で、その厚さｔ１は、０．６〜１．６ｍｍの範囲がより好ましい。 The lid 1 of the container for a lithium ion battery used as a power source for a mobile phone, a notebook personal computer, an automobile, etc., is made of an aluminum alloy thin plate and has a thickness t 1 in the range of 0.5 to 2 mm. Is preferred. The thickness t 1 is less than 0.5mm of the lid 1, also widely 1000 system or 3000 series aluminum alloy sheet of used as a material for a lithium-ion battery cover as was used as the material lid 1, is required as a lid 1 Lack of rigidity and strength. On the other hand, if the thickness t 1 of the lid 1 is more than 2 mm, even a battery container body as an aluminum alloy sheet, together with the weight becomes heavier, thicker thickness, composed of the thin flat portion 3 or breakage groove 4 It becomes difficult to process the explosion-proof valve 2 with high accuracy. Further, when the breaking groove 4 is formed by coining, the occurrence of non-uniformity of the deflection of the lid 1 and the occurrence of constriction in the flat bottom 4a of the breaking groove 4 are prevented, and the flat bottom 4a In consideration of workability such as stabilizing the thickness of the steel, corrosion resistance, and the like, the lid 1 is a 1000-series or 3000-series aluminum alloy having a yield strength of 30 to 130 MPa, and its thickness t 1 is 0.6 to 1 A range of .6 mm is more preferable.

図１に示す線状に形成した破断用溝部４は、図７に示す従来技術の場合と同様に、陸上競技のトラックのような閉曲線（曲線と直線を繋ぎ合わせた閉曲線）に形成されている。しかし、コイニング加工により薄肉平坦部３に形成される線状の破断用溝部４も上記陸上競技のトラックのような閉曲線（曲線と直線を繋ぎ合わせた閉曲線；すなわち、一部に曲線を含む閉曲線の一種）に限定されるものではなく、曲線からなるまたは一部に曲線を含む閉曲線（図５（ａ）参照）、あるいは、前記閉曲線の一部が不連続となる不連続閉曲線、あるいは、複数の直線が組み合わされた（図５（ｂ）参照）ように形成された破断用溝部とすることも可能である。   As in the case of the prior art shown in FIG. 7, the breaking groove 4 formed in the linear shape shown in FIG. 1 is formed in a closed curve (closed curve obtained by connecting the curve and the straight line) like a track for track and field. . However, the linear breaking groove 4 formed in the thin flat portion 3 by coining is also a closed curve like the track of the above-mentioned track and field (a closed curve obtained by connecting the curve and the straight line; Is not limited to one type), but is a closed curve consisting of a curve or including a curve in part (see FIG. 5A), a discontinuous closed curve in which a part of the closed curve is discontinuous, or a plurality of closed curves It is also possible to use a breaking groove formed as a combination of straight lines (see FIG. 5B).

また、図６は本発明のさらに別の実施形態のリチウムイオン電池用容器の防爆弁の構造を示す斜視図である。図６は、図１に示す構成を基本とするものであるため、その差異についてのみ説明する。すなわち、図６においては、図１に示す陸上競技のトラックのような閉曲線（曲線と直線を繋ぎ合わせた閉曲線）に形成された破断用溝部４の内、直線状の破断用溝部４の一部に破断用溝部４が存在しない不連続部５が設けられていることが図１との特徴的な差異である。   FIG. 6 is a perspective view showing the structure of an explosion-proof valve of a lithium ion battery container according to still another embodiment of the present invention. Since FIG. 6 is based on the configuration shown in FIG. 1, only the difference will be described. That is, in FIG. 6, a part of the linear breaking groove 4 out of the breaking grooves 4 formed in a closed curve (closed curve obtained by connecting a straight line and a straight line) like the track of the track and field shown in FIG. 1 is characteristically different from FIG. 1 in that a discontinuous portion 5 in which the breaking groove portion 4 does not exist is provided.

なお、薄肉平坦部３の厚さｔ２（図３参照）は、７０〜２００μｍである。薄肉平坦部３の厚さｔ２が７０μｍ未満では、前記１０００系あるいは３０００系のアルミニウム合金薄板を蓋１の素材として用いたとしても、蓋１として要求される剛性や強度が不足する。一方、薄肉平坦部３の厚さが２００μｍを超えると、後に加工される破断用溝部４の厚さを十分薄くする加工（コイニング加工）が困難となり、電池容器の内部圧力上昇に対して、電池容器の破裂を防ぐため、破裂しない程度の内部圧力で開裂せず、防爆弁の起点となれない。 Incidentally, (see FIG. 3) the thickness t 2 of the thin flat portion 3 is 70～200Myuemu. When the thickness t 2 of the thin flat portion 3 is less than 70 μm, even if the 1000 series or 3000 series aluminum alloy thin plate is used as the material of the lid 1, the rigidity and strength required for the lid 1 are insufficient. On the other hand, if the thickness of the thin flat portion 3 exceeds 200 μm, it becomes difficult to sufficiently thin the thickness of the fracture groove 4 to be processed later (coining processing), and the battery can be protected against an increase in the internal pressure of the battery container. In order to prevent the container from rupturing, it does not rupture at an internal pressure that does not rupture.

次に、図２、図３を用いて、コイニング加工により薄肉平坦部３に形成される線状の破断用溝部４の断面形状について詳述する。   Next, the cross-sectional shape of the linear breaking groove portion 4 formed in the thin flat portion 3 by coining will be described in detail with reference to FIGS.

図２は、図１に示すＡＡ断面であり、上記陸上競技のトラックのような閉曲線の内の曲線箇所を切断した断面である。図２において、破断用溝部４は、破断用溝部４の肉厚を規定している平坦状底部４ａと、この底部４ａから薄肉平坦部３まで立ち上がる対向した傾斜両側壁４ｃ、４ｄと、により形成されたＶ字形の断面形状をなしている。   FIG. 2 is a cross section taken along the line AA shown in FIG. 1, and is a cross section obtained by cutting a curved portion of a closed curve like the track of the track and field. In FIG. 2, the breaking groove 4 is formed by a flat bottom 4 a that defines the thickness of the breaking groove 4, and opposed inclined side walls 4 c and 4 d that rise from the bottom 4 a to the thin flat portion 3. V-shaped cross-sectional shape.

図３は、破断用溝部４のＶ字形の断面形状（図２に示す曲線アで囲まれた断面形状）を拡大し、さらに詳細に説明するための拡大断面図である。図３において、破断用溝部４の厚さ（破断用溝部４の肉厚を規定している平坦状底部４ａの残存厚さｔ３）は、１０〜７０μｍの範囲とする。破断用溝部４の厚さが１０μｍ未満では、前記１０００系あるいは３０００系のアルミニウム合金薄板を蓋１の素材として用いたとしても、蓋１として要求される剛性や強度が不足する。一方、破断用溝部４の厚さが７０μｍを超えると、電池容器の内部圧力上昇に対して、電池容器の破裂を防ぐため、破裂しない程度の内部圧力で開裂せず、防爆弁の起点となれない。また、平坦状底部４ａの幅Ｗ１は、特に限定されないが、加工性および強度の点で好ましくは５〜３０μｍである。また、傾斜両側壁４ｃ、４ｄの一方の傾斜側壁４ｃの傾斜角度θ１が他方の傾斜側壁４ｄの傾斜角度θ２に比べて大きくなるような構成を有している。例えば、θ１＝６０度、θ２＝４５度である。したがって、破断用溝部４の薄肉平坦部３の表面に開口している幅Ｗ２は、上記平坦状底部４ａの幅Ｗ１とも整合するように、
Ｗ２＝Ｗ１＋（ｔ２−ｔ３）×（cotanθ1＋cotanθ2）
である。本実施形態においては、θ１＝６０度、θ２＝４５度である場合について説明したが、必ずしもこれにのみ限定されるものではなく、容器としての要求仕様、加工性や耐食性等を総合的に考慮した場合、θ１は４５〜８０度の範囲、θ２は３５〜７０度の範囲で、かつθ１＞θ２の条件を満足していればよい。 FIG. 3 is an enlarged cross-sectional view for enlarging the V-shaped cross-sectional shape (the cross-sectional shape surrounded by the curve A shown in FIG. 2) of the breaking groove portion 4 for further detailed explanation. In FIG. 3, the thickness of the breaking groove 4 (the remaining thickness t 3 of the flat bottom 4a that defines the thickness of the breaking groove 4) is in the range of 10 to 70 μm. When the thickness of the breaking groove 4 is less than 10 μm, even if the 1000 series or 3000 series aluminum alloy thin plate is used as the material of the lid 1, the rigidity and strength required for the lid 1 are insufficient. On the other hand, if the thickness of the breaking groove 4 exceeds 70 μm, the battery container will not be ruptured against an increase in the internal pressure of the battery container. Absent. Further, the width W 1 of the flat bottom portion 4a is not particularly limited, but is preferably 5 to 30 μm in terms of workability and strength. The inclination side walls 4c, the inclination angle theta 1 of one inclined side wall 4c of 4d has a larger configuration than the inclination angle theta 2 of the other inclined side wall 4d. For example, θ 1 = 60 degrees and θ 2 = 45 degrees. Therefore, the width W 2 which is open to the surface of the thin flat portion 3 of the break groove 4, so that the width W 1 both alignment of the flat bottom portion 4a,
W 2 = W 1 + (t 2 −t 3 ) × (cotan θ 1 + cotan θ 2 )
It is. In the present embodiment, the case of θ 1 = 60 degrees and θ 2 = 45 degrees has been described. However, the present invention is not necessarily limited to this, and the required specifications as a container, workability, corrosion resistance, and the like are comprehensive. In this case, it is sufficient that θ 1 is in the range of 45 to 80 degrees, θ 2 is in the range of 35 to 70 degrees, and the condition of θ 1 > θ 2 is satisfied.

ここで傾斜角度θ１や傾斜角度θ２は、立ち上がりから薄肉平坦部３までを均一な角度とせずとも、途中で角度が段階的に変わったり、途中に水平な部分や段差を部分的に設けても良い。その場合の傾斜角度θの目安は、これらの違う角度を平均した平均角度とする。 Here, the inclination angle θ 1 and the inclination angle θ 2 are not uniform from the rising edge to the thin flat portion 3, and the angle changes stepwise in the middle, or a horizontal portion or a step is partially provided in the middle. May be. In this case, the standard of the inclination angle θ is an average angle obtained by averaging these different angles.

何故、本発明のような構成を採用すると、破断用溝部４が塑性加工により形成された場合にも、破断用溝部４の平坦状底部４ａにおけるくびれの発生が防止され、かつ、平坦状底部４ａの厚さも安定した容器の防爆弁の構造を提供することが可能になったのかについて、解析シミュレーションにより考察を試みた。   This is why, when the configuration as in the present invention is adopted, even when the breaking groove 4 is formed by plastic working, the occurrence of constriction in the flat bottom 4a of the breaking groove 4 is prevented, and the flat bottom 4a. We tried to investigate whether it was possible to provide the structure of the explosion-proof valve of the container with stable thickness.

その結果、塑性加工（コイニング加工）により薄肉平坦部３に線状の破断用溝部４を形成する際に、防爆弁２を構成する破断用溝部４の周辺箇所（後記図４に示す符号イ、ウ）内の内部応力に特徴的な現象が現れることが判明した。なお、図４は、塑性加工（コイニング加工）により破断用溝部４を形成する場合の破断用溝部４の周辺箇所（符号イ、ウ）に発生する変形状態および応力状態を図２に示す矢印Ｂの方向から観察した（上面視）結果を模式的に説明する模式説明図である。   As a result, when the linear breaking groove 4 is formed in the thin flat portion 3 by plastic working (coining), the peripheral portion of the breaking groove 4 constituting the explosion-proof valve 2 (the reference symbol a, It was found that a characteristic phenomenon appears in the internal stress in c). FIG. 4 shows an arrow B shown in FIG. 2 showing the deformation state and the stress state occurring in the peripheral portion (symbols a and c) of the breaking groove portion 4 when the breaking groove portion 4 is formed by plastic working (coining processing). It is a schematic explanatory drawing which illustrates typically the result observed from the direction (top view).

破断用溝部４付近の材料には紙面垂直方向から圧縮応力が加わるため、材料内は高い圧縮応力が作用し、圧力が高くなる。しかしながら、破断用溝部４の外側の位置ウでは、周方向に広がるような引張変形が加わるため、上記圧縮応力が緩和され、圧力は他の部位より低くなる。その一方で、仮に図３に示すようなθ１＞θ２の条件を満足させずに、従来のようにθ１＝θ２に設定すると、破断用溝部４の内側の位置イでは、周方向に縮むような圧縮変形が加わるので、圧縮応力がより高くなり、圧力はより高くなる。したがって、これらのイ、ウ間の圧力差により、破断用溝部４を通じての材料の移動を引き起こしてしまい、平坦状底部４ａの厚さの安定性に悪影響する（より詳細は、後記参照）。しかしながら、本発明では、図４からも明らかなように、前記した図２および図３の通り、傾斜両側壁４ｃ、４ｄの、一方の傾斜側壁４ｃの傾斜角度θ１を、他方の傾斜側壁４ｄの傾斜角度θ２に比べて大きくしており、蓋１の内側の位置イ（傾斜側壁４ｃ側）での周方向圧縮変形が緩和されるため、蓋１の外側の位置ウ（傾斜側壁４ｄ側）との圧力差が減少し、平坦状底部４ａの厚さの安定性も改善される。 Since compressive stress is applied to the material in the vicinity of the fracture groove 4 from the direction perpendicular to the paper surface, high compressive stress acts on the material, and the pressure increases. However, since the tensile deformation that spreads in the circumferential direction is applied to the position c outside the breaking groove 4, the compressive stress is relieved and the pressure becomes lower than that of other parts. On the other hand, if the condition of θ 1 > θ 2 as shown in FIG. 3 is not satisfied and θ 1 = θ 2 is set as in the prior art, at the position a inside the fracture groove 4, the circumferential direction Compressive deformation that shrinks to a higher pressure is applied, so that the compressive stress becomes higher and the pressure becomes higher. Therefore, the difference in pressure between these a and c causes the movement of the material through the breaking groove 4 and adversely affects the stability of the thickness of the flat bottom portion 4a (see below for details). However, in the present invention, as is apparent from FIG. 4, as shown in FIGS. 2 and 3, the inclined angle θ1 of one inclined side wall 4c of the inclined side walls 4c, 4d is set to the other inclined side wall 4d. the inclination angle θ is made larger than the 2, because the circumferential compressive deformation at the location of the inside of the lid 1 b (inclined side wall 4c side) is reduced, the position c (inclined side wall 4d side of the outer cover 1 ) And the stability of the thickness of the flat bottom portion 4a is improved.

より具体的に、上面視円弧状に設けられた破断用溝部４のＶ字形の断面形状における中央に近い、内側の箇所（符号イの箇所）の材料、すなわち傾斜側壁４ｃ側の材料に作用する圧力（圧縮応力）と、破断用溝部４のＶ字形の断面形状における中央から遠い、外側の箇所（符号ウの箇所）の材料、すなわち傾斜側壁４ｄ側の材料に作用する圧力（圧縮応力）が略同じ位になり、圧力差が減少している。   More specifically, it acts on the material of the inner portion (the portion of symbol A) near the center of the V-shaped cross-sectional shape of the fracture groove 4 provided in an arc shape when viewed from above, that is, the material on the inclined side wall 4c side. The pressure (compressive stress) and the pressure (compressive stress) acting on the material on the outer side (the part of the symbol C) far from the center in the V-shaped cross-sectional shape of the breaking groove 4, that is, on the inclined side wall 4 d side It is almost the same, and the pressure difference is decreasing.

これによって、符号イの側から符号ウの側に材料が流れ出すような変形が阻止されたものと考えられる。これが、破断用溝部４の平坦状底部４ａにおけるくびれの発生が防止され、かつ、平坦状底部４ａの厚さも安定した容器の防爆弁２の構造を提供することが可能になった原因と推察している。   As a result, it is considered that the deformation in which the material flows out from the side of the symbol A to the side of the symbol C is prevented. This is presumed to be the reason why it is possible to provide the structure of the explosion-proof valve 2 of the container in which the occurrence of constriction in the flat bottom 4a of the breaking groove 4 is prevented and the thickness of the flat bottom 4a is stable. ing.

比較のために解析シミュレーションした結果、塑性加工（コイニング加工）により薄肉平坦部３０に線状の破断用溝部４０を形成する際に、防爆弁２０を構成する破断用溝部４０の周辺箇所（後記図１０に示す符号カ、キ）内の内部応力にも特徴的な現象が現れていることが判明した。なお、図１０は、塑性加工（コイニング加工）により破断用溝部４０を形成する場合の破断用溝部４０の周辺箇所（符号カ、キ）に発生する変形状態および応力状態を図８に示す矢印Ｄの方向から観察した（上面視）結果を模式的に説明する模式説明図である。   As a result of analysis simulation for comparison, when forming the linear breaking groove 40 in the thin flat portion 30 by plastic working (coining), the peripheral portion of the breaking groove 40 constituting the explosion-proof valve 20 (described later) It was found that a characteristic phenomenon also appears in the internal stress in the reference numeral 10). FIG. 10 shows an arrow D shown in FIG. 8 indicating the deformation state and the stress state occurring in the peripheral portion (symbol K) of the fracture groove 40 when the fracture groove 40 is formed by plastic working (coining). It is a schematic explanatory drawing which illustrates typically the result observed from the direction (top view).

この図１０からも明らかなように、上面視円弧状に設けられた破断用溝部４０のＶ字形の断面形状における中央に近い、内側の箇所（符号カの箇所）の材料、すなわち傾斜側壁４０ｃ側の材料に作用する圧力（圧縮応力）は大きく、破断用溝部４０のＶ字形の断面形状における中央から遠い、外側の箇所（符号キの箇所）の材料、すなわち傾斜側壁４０ｄ側の材料に作用する圧力（圧縮応力）は符号カの箇所の圧力（圧縮応力）に比べて小さく、むしろ材料を周方向に広げる引張圧力が働いていることが分かる。   As is clear from FIG. 10, the material of the inner part (reference numeral part) near the center of the V-shaped cross-sectional shape of the breaking groove 40 provided in an arc shape when viewed from above, that is, the inclined side wall 40c side. The pressure (compressive stress) acting on the material is large and acts on the material in the outer portion (sign key location) far from the center in the V-shaped cross-sectional shape of the breaking groove 40, that is, on the material on the inclined side wall 40d side. It can be seen that the pressure (compressive stress) is smaller than the pressure (compressive stress) at the point of reference sign, and rather, the tensile pressure that spreads the material in the circumferential direction works.

これが、傾斜側壁４０ｃの傾斜角度θと傾斜側壁４０ｄの傾斜角度θとを等しくした破断用溝部４０を塑性加工（コイニング加工）により形成した場合、図８に示す破断用溝部４０の平坦状底部４０ａの下方（符号クの部分）にくびれが生じてしまう原因と推察している。   In the case where the breaking groove 40 having the equal inclination angle θ of the inclined side wall 40c and the inclination angle θ of the inclined side wall 40d is formed by plastic working (coining), the flat bottom 40a of the breaking groove 40 shown in FIG. This is presumed to be the cause of the constriction below (the portion marked with the symbol).

したがって、図２のように、材料に作用する圧力（圧縮応力）が大きい側の、蓋１の内側に位置する傾斜側壁４ｃの傾斜角度θ１を、材料に作用する圧力（圧縮応力）が小さく、材料に引張圧力が働いている側の、蓋１の外側に位置する傾斜側壁４ｄの傾斜角度θ２よりも大きくすれば、蓋１の内外（破断用溝部４の内外両側）に位置する両側の材料に作用する圧力（圧縮応力）差を減少させることができる。そして、これによって、コイニング加工の際の破断用溝部４の平坦状底部４ａの下方に生じるくびれを抑制することができる。 Therefore, as shown in FIG. 2, the inclination angle θ 1 of the inclined side wall 4c located on the inner side of the lid 1 on the side where the pressure (compressive stress) acting on the material is large is reduced. , the side working pressure tensile material, be set larger than the inclination angle theta 2 of the inclined side wall 4d located outwardly of the lid 1, both sides located inside and outside of the lid 1 (inner and outer sides of the break groove 4) The difference in pressure (compressive stress) acting on the material can be reduced. And thereby, the constriction which arises under the flat bottom part 4a of the groove part 4 for a fracture | rupture in the case of coining process can be suppressed.

このため、これら傾斜側壁４ｃの傾斜角度θ１と傾斜側壁４ｄの傾斜角度θ２の互いの角度差は、破断用溝部４の内側と外側での圧縮応力の差、圧縮応力と引張応力との差の程度によって、前記した角度範囲から選択すれば良い。 Therefore, the angular difference of the mutual inclination angle theta 2 of the inclination angle theta 1 and inclined side wall 4d of the inclined side walls 4c, the difference in compressive stress in the inner and outer break groove 4, the compressive stress and tensile stress The angle range may be selected according to the degree of difference.

また、これら傾斜側壁４ｃの傾斜角度θ１と傾斜側壁４ｄの傾斜角度θ２の互いの角度差を設ける位置も、破断用溝部４の全長あるいは全てでなくとも、これらの圧力差が大きくなる、破断用溝部４が平面視で円弧状となる部分など、選択的あるいは部分的に選択できる。 Also, position where the mutual angle difference of the inclination angle theta 2 of the inclination angle theta 1 and inclined side wall 4d of the inclined side walls 4c, not be the full length or all of the break groove 4, these pressure difference increases, The breaking groove 4 can be selected selectively or partially such as a portion having an arc shape in plan view.

本実施形態においては、上述したような上面視円弧状に設けられた破断用溝部４のＶ字形の断面形状についての内部応力状態について説明したが、必ずしも円弧状に設けられた破断用溝部４に関してのみに言えることではなく、平坦状底部４ａと底部４ａから薄肉平坦部３まで立ち上がる対向した傾斜両側壁と、により形成されたＶ字形の断面形状をなし、それぞれの側に圧力（圧縮応力）状態の差が生じやすい箇所には、本発明が様々な変形態様として採用可能であると推察する。例えば、図５（ａ）に示される曲線からなるまたは一部に曲線を含む閉曲線の場合は、閉曲線状の破断用溝部４ｅの内側の傾斜側壁の傾斜角度を、外側の傾斜側壁の傾斜角度よりも大きくすることが効果的である。また、図５（ｂ）の場合においては、薄肉平坦部３における破断用溝部４の位置を勘案し、上述のまたは図４で示した圧力バランスの考えに基づいて個々の直線状の破断用溝部４ｆ、４ｇの傾斜側壁の傾斜角度を決めることができる。   In this embodiment, although the internal stress state about the V-shaped cross-sectional shape of the breaking groove portion 4 provided in the arc shape as viewed from above has been described, the breaking groove portion 4 provided in the arc shape is not necessarily described. It can be said not only, but it has a V-shaped cross-section formed by the flat bottom 4a and opposite inclined side walls rising from the bottom 4a to the thin flat portion 3, and a pressure (compressive stress) state on each side. It is presumed that the present invention can be adopted as various modifications in places where the difference is likely to occur. For example, in the case of a closed curve composed of the curve shown in FIG. 5 (a) or including a curve in part, the inclination angle of the inner inclined side wall of the closed groove-like breaking groove 4e is set to be larger than the inclination angle of the outer inclined side wall. Is also effective. In the case of FIG. 5 (b), the position of the breaking groove 4 in the thin flat portion 3 is taken into consideration, and the individual straight breaking grooves are formed based on the idea of the pressure balance described above or shown in FIG. The inclination angles of the 4f and 4g inclined side walls can be determined.

なお、本実施形態においては、容器の蓋に防爆弁を設ける例について説明したが、必ずしもこれに限定されるものではなく、容器を構成するいずれかの表面に防爆弁が設けられていればよい。   In this embodiment, the example in which the explosion-proof valve is provided on the lid of the container has been described. However, the present invention is not necessarily limited to this, and it is only necessary that the explosion-proof valve is provided on any surface constituting the container. .

１ リチウムイオン電池用容器の蓋
１ａ、１ｂ、１ｃ、１ｄ 蓋１の側壁
２ 防爆弁
３ 薄肉平坦部
３ａ 傾斜壁
４、４ｅ、４ｆ、４ｇ 破断用溝部
４ａ 平坦状底部
４ｃ、４ｄ 傾斜側壁
５ 破断用溝部４の不連続部 DESCRIPTION OF SYMBOLS 1 Lithium ion battery container lid 1a, 1b, 1c, 1d Side wall of lid 1 2 Explosion-proof valve 3 Thin flat portion 3a Inclined wall 4, 4e, 4f, 4g Breaking groove 4a Flat bottom portion 4c, 4d Inclined side wall 5 Break Discontinuous part of groove part 4

Claims (3)

密封構造をなす容器の防爆弁の構造であって、
前記防爆弁は、
前記容器を構成する表面に、この表面の周辺部より薄肉に形成された薄肉平坦部と、塑性加工により前記薄肉平坦部に線状に形成された破断用溝部と、を備え、
この線状に形成された破断用溝部は、
前記破断用溝部の肉厚を規定している平坦状底部と、この底部から前記薄肉平坦部まで立ち上がる対向した傾斜両側壁と、により形成されたＶ字形の断面形状をなし、
前記傾斜両側壁の前記薄肉平坦部の中心側の傾斜側壁の傾斜角度θ１が他方の傾斜側壁の傾斜角度θ２に比べて大きく、
前記傾斜角度θ１が４５度以上８０度以下、前記傾斜角度θ２が３５度以上７０度以下であること
を特徴とする容器の防爆弁の構造。 An explosion-proof valve structure for a container having a sealed structure,
The explosion-proof valve is
On the surface constituting the container, a thin flat portion formed thinner than the peripheral portion of the surface, and a breaking groove formed linearly in the thin flat portion by plastic processing,
The breaking groove formed in this linear shape is
A V-shaped cross-sectional shape formed by a flat bottom portion defining the thickness of the breaking groove portion and opposing inclined side walls rising from the bottom portion to the thin flat portion,
The inclination angle θ1 of the inclined side wall on the center side of the thin flat portion of the inclined side walls is larger than the inclination angle θ2 of the other inclined side wall,
The structure of an explosion-proof valve for a container, wherein the inclination angle θ1 is 45 degrees or more and 80 degrees or less, and the inclination angle θ2 is 35 degrees or more and 70 degrees or less. 前記線状に形成された破断用溝部は、曲線からなるまたは一部に曲線を含む閉曲線、あるいは、前記閉曲線の一部が不連続となる不連続閉曲線、あるいは、複数の直線が組み合わされたように形成された破断用溝部であることを特徴とする請求項１に記載の容器の防爆弁の構造。   The breaking groove portion formed in the linear shape is a closed curve including a curve or partially including a curve, a discontinuous closed curve in which a part of the closed curve is discontinuous, or a combination of a plurality of straight lines. 2. The explosion-proof valve structure for a container according to claim 1, wherein the structure is a breaking groove formed in the container. 前記容器は、リチウムイオン電池用容器であることを特徴とする請求項１又は請求項２に記載の容器の防爆弁の構造。 The said container is a container for lithium ion batteries, The structure of the explosion-proof valve of the container of Claim 1 or Claim 2 characterized by the above-mentioned.
JP2014215335A 2014-10-22 2014-10-22 Construction of container explosion-proof valve Expired - Fee Related JP6275621B2 (en)

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