JP2005259413A - Battery - Google Patents

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JP2005259413A
JP2005259413A JP2004066798A JP2004066798A JP2005259413A JP 2005259413 A JP2005259413 A JP 2005259413A JP 2004066798 A JP2004066798 A JP 2004066798A JP 2004066798 A JP2004066798 A JP 2004066798A JP 2005259413 A JP2005259413 A JP 2005259413A
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valve
hole
metal
recess
battery
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JP4622271B2 (en
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Takeshi Shimozono
下薗　　武司
Kuniyoshi Munenaga
胸永　　訓良
Isao Suzuki
鈴木　　勲
雅和 ▲堤▼
Masakazu Tsutsumi
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Japan Storage Battery Co Ltd
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Japan Storage Battery Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery preventing electrolyte leakage caused by insufficient junction of a blowout valve 2 by forming a standing wall part 2b in the peripheral part of the blowout valve 2. <P>SOLUTION: The battery is equipped with a recessed part 1a formed on the surface of a cover plate 1, a through hole 1c to the inside formed in a part of a bottom surface 1b of the recessed part 1a, the blowout valve 2 arranged on the bottom surface 1b so as to block the through hole 1c inside the recessed part 1a, and an annular plate 3 arranged to press the blowout valve 2 down inside the recessed part 1a, and the bottom surface 1b of the recessed part 1a, the blowout valve 2, and the annular plate 3 are joined in the periphery of the through hole 1c, and the standing wall part 2b along the side surface of the recessed part 1a is formed in the peripheral part of the blowout valve 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、金属製の電池容器に形成した貫通孔を金属箔等からなる破裂弁で塞ぐことにより、電池内圧の異常な上昇時にガス抜きを行う安全弁を設けた電池に関するものである。   The present invention relates to a battery provided with a safety valve that vents gas when the internal pressure of the battery is abnormally increased by closing a through hole formed in a metal battery container with a burst valve made of metal foil or the like.

電池は、例えば発電要素を収納する金属製の電池缶の開口部を金属製の蓋板で塞ぎ封止することにより密閉型の電池容器を構成したものが多い。そして、このような電池には、電池容器の蓋板等に安全弁を設けて、この電池容器内の異常な圧力上昇時にガス抜きを行うようにしたものがある（例えば、特許文献１参照。）。   In many cases, a battery is configured as a sealed battery container by, for example, closing and sealing an opening of a metal battery can that houses a power generation element with a metal lid plate. Such batteries include a safety valve provided on the lid of the battery container or the like so that gas is vented when the pressure in the battery container increases abnormally (see, for example, Patent Document 1). .

上記安全弁を蓋板に設けた場合の従来の構成例を図５に示す。この安全弁は、蓋板１に凹部１ａを形成すると共に、この凹部１ａの底面１ｂの中央に貫通孔１ｃを形成し、この凹部１ａ内に、平坦な金属箔からなる破裂弁２と、金属板の中央を開口した環状板３とを重ねて配置し、レーザ溶接によりこれら破裂弁２と環状板３とを凹部１ａの底面１ｂに接合することにより構成されている。   FIG. 5 shows a conventional configuration example when the safety valve is provided on the lid plate. The safety valve is formed with a recess 1a in the lid plate 1 and a through hole 1c in the center of the bottom surface 1b of the recess 1a. In the recess 1a, a rupture valve 2 made of a flat metal foil, and a metal plate An annular plate 3 having an opening at the center thereof is placed in an overlapping manner, and the rupture valve 2 and the annular plate 3 are joined to the bottom surface 1b of the recess 1a by laser welding.

ところが、破裂弁２は、厚さ数十μｍ程度の金属箔に、所定の圧力以上で破断するようにした溝２ａを形成したものであるため、この溝２ａの形成過程で平坦な箔に歪みや反りを生じることが多くなる。このため、従来は、環状板３で破裂弁２を凹部１ａの底面１ｂに押さえ付けても、貫通孔１ｃの周囲の一部に僅かに浮き上がった部分が生じるので、この部分でレーザ溶接による接合が不十分になり、製造時又は使用中に密閉不良となって液漏れが発生するおそれがあるという問題が生じていた。また、この破裂弁２は、薄い金属箔に溝２ａを形成したものであるため、組み立て作業時に不用意な力が加わり歪みや反りが生じたり、環状板３で凹部１ａの底面１ｂに押さえ付けて歪みや反りを無理に矯正しようとすると、溝２ａに亀裂が生じて、この溝２ａの部分でも液漏れが発生するおそれがあるという問題があった。さらに、この破裂弁２は、薄い平坦な金属箔であるため、凹部１ａに挿入したときに側面に引っ掛かって、底面１ｂ上に完全に乗らずに斜めに挿入されることがあり、このような状態でさらに環状板３を重ねて押さえ付けると、この破裂弁２の縁部が折れたり曲がることがあり、これによってレーザ溶接による接合が不十分になって、液漏れが発生するおそれがあるという問題もあった。
特許第３００３５１１号公報 However, the rupture valve 2 is a metal foil having a thickness of about several tens of μm formed with a groove 2a that is ruptured at a predetermined pressure or higher. And warping often occur. For this reason, conventionally, even if the rupture valve 2 is pressed against the bottom surface 1b of the recess 1a with the annular plate 3, a slightly raised portion is generated around the through hole 1c. Has become insufficient, and there has been a problem that liquid leakage may occur due to poor sealing during production or use. In addition, since the rupture valve 2 is formed by forming a groove 2a in a thin metal foil, an inadvertent force is applied during the assembly operation to cause distortion or warpage, or the annular plate 3 is pressed against the bottom surface 1b of the recess 1a. In other words, if the distortion or warpage is forcibly corrected, there is a problem that a crack is generated in the groove 2a and liquid leakage may occur in the groove 2a. Furthermore, since this rupture valve 2 is a thin flat metal foil, it may be caught at the side surface when inserted into the recess 1a, and may be inserted obliquely without completely riding on the bottom surface 1b. If the annular plate 3 is further stacked and pressed in the state, the edge of the burst valve 2 may be bent or bent, which may result in insufficient joining by laser welding, which may cause liquid leakage. There was also a problem.
Japanese Patent No. 3003511

本発明は、金属製破裂弁の周縁部に立壁部を形成することにより、この金属製破裂弁の接合が不十分になって液漏れのおそれが生じるという問題を解決しようとするものである。   The present invention seeks to solve the problem of forming a standing wall portion at the peripheral edge of a metal rupture valve, resulting in insufficient joining of the metal rupture valve and the risk of liquid leakage.

請求項１の発明は、金属製電池容器の表面に形成された凹部であって、この凹部の底面の一部に内部への貫通孔が形成された凹部と、この凹部内で貫通孔を塞ぐように底面に配置された金属製破裂弁と、この凹部内で金属製破裂弁を押さえるために配置された金属製環状体とを備え、この凹部の底面と金属製破裂弁と金属製環状体とが貫通孔の周囲で接合された電池において、金属製破裂弁の周縁部に、凹部の側面に沿う立壁部が形成されたことを特徴とする。   The invention according to claim 1 is a recess formed in the surface of the metal battery container, the recess having a through hole formed in a part of the bottom surface of the recess, and the through hole is closed in the recess. The metal burst valve disposed on the bottom surface and a metal annular body disposed to hold the metal burst valve in the recess, the bottom surface of the recess, the metal burst valve, and the metal annular body In the battery joined with the periphery of the through hole, a standing wall portion along the side surface of the recess is formed at the peripheral edge portion of the metal burst valve.

請求項１の発明によれば、金属製破裂弁の周縁部に立壁部が形成されるので、溝の形成過程等で歪みや反りが生じ難くなる。また、このような立壁部が形成されることにより、組み立て作業時に不用意な力が加わったとしても歪みや反りが生じるようなことがなくなり、溝に亀裂が容易に生じるようなおそれもなくなる。さらに、金属製破裂弁が底面に配置される際に、立壁部が凹部の側面に沿うので、この金属製破裂弁が組み立て時に凹部に斜めにずれて挿入されることもなくなる。従って、金属製破裂弁が凹部の底面と金属製環状体との間に確実に隙間なく配置されるので、接合が不十分になったり、溝に亀裂が発生して、液漏れが生じるようなことがなくなる。   According to the first aspect of the present invention, since the standing wall portion is formed at the peripheral edge portion of the metal burst valve, distortion and warpage are hardly generated in the process of forming the groove. In addition, since such a standing wall portion is formed, even if an inadvertent force is applied during the assembly operation, no distortion or warpage occurs, and there is no possibility that the groove easily cracks. Further, when the metal burst valve is disposed on the bottom surface, the standing wall portion extends along the side surface of the recess, so that the metal burst valve is not inserted obliquely into the recess during assembly. Accordingly, since the metal burst valve is reliably disposed between the bottom surface of the recess and the metal annular body, the joining may be insufficient, the groove may crack, and liquid leakage may occur. Nothing will happen.

以下、本発明の最良の実施形態について図１〜図４を参照して説明する。なお、これらの図１〜図４においても、図５に示した従来例と同様の機能を有する構成部材には同じ番号を付記する。   Hereinafter, the best embodiment of the present invention will be described with reference to FIGS. 1 to 4, the same reference numerals are given to the constituent members having the same functions as those of the conventional example shown in FIG.

本実施形態では、安全弁を蓋板に設けた非水電解質二次電池について説明する。この非水電解質二次電池は、図２に示すように、ステンレス鋼製の電池缶４の上端開口部にステンレス鋼製の蓋板１を嵌め込んで溶接により内部を密閉することにより電池容器を構成している。そして、この電池缶４の内部には、発電要素５が収納されている。   In the present embodiment, a nonaqueous electrolyte secondary battery in which a safety valve is provided on a lid plate will be described. As shown in FIG. 2, this non-aqueous electrolyte secondary battery has a battery container sealed by fitting a stainless steel lid plate 1 into an upper end opening of a stainless steel battery can 4 and sealing the inside by welding. It is composed. A power generation element 5 is housed inside the battery can 4.

上記蓋板１には、図１に示すように、上面から内部側に窪ませた凹部１ａが形成されていて、この凹部１ａの底面１ｂの中央部には、内部に通じる貫通孔１ｃが形成されている。なお、これらの凹部１ａと貫通孔１ｃは、ここでは円形の窪みや孔とした場合を示す。   As shown in FIG. 1, the cover plate 1 is formed with a recess 1a that is recessed from the top surface to the inside, and a through hole 1c that leads to the inside is formed at the center of the bottom surface 1b of the recess 1a. Has been. In addition, the recessed part 1a and the through-hole 1c show here the case where it is set as the circular hollow and hole.

上記蓋板１の凹部１ａの底面１ｂ上には、貫通孔１ｃを塞ぐように、破裂弁２が配置される。破裂弁２は、厚さ５０μｍの円板状のニッケル箔の中央部に深さ３０μｍの溝２ａを十字形に形成すると共に、周縁部の全周に立壁部２ｂを形成したものである。立壁部２ｂは、水平な円板部２ｃの周縁部が全周にわたって上向きに短い筒状に折れ曲がった部分であり、外径が凹部１ａの内径よりも少し小さくなるようにして、この凹部１ａの側面に沿うようにしたものである。このような破裂弁２は、例えば厚さ２０μｍのニッケル箔をプレス加工により立壁部２ｂを有する円板状に打ち抜き、溝２ａを除いた円板部２ｃの上面等に３０μｍの厚さのニッケルメッキを施すことにより作製される。従って、溝２ａの部分での板厚は、正確に元のニッケル箔の厚さと同じ２０μｍとなるので、この溝２ａを所定の圧力以上で確実に破断させることができるようになる。   On the bottom surface 1b of the recess 1a of the lid plate 1, a rupture valve 2 is disposed so as to close the through hole 1c. The rupture valve 2 is formed by forming a groove 2a having a depth of 30 μm in a cross shape in the center of a disk-shaped nickel foil having a thickness of 50 μm and forming a standing wall 2b on the entire periphery of the peripheral edge. The standing wall portion 2b is a portion where the peripheral edge portion of the horizontal disk portion 2c is bent upward in a short cylindrical shape over the entire circumference, and the outer diameter is slightly smaller than the inner diameter of the concave portion 1a. Along the side. Such a rupture valve 2 is formed by, for example, punching a nickel foil having a thickness of 20 μm into a disk shape having a standing wall portion 2b by press working, and nickel plating having a thickness of 30 μm on the upper surface of the disk portion 2c excluding the groove 2a. It is produced by giving. Accordingly, the plate thickness at the groove 2a is exactly 20 μm which is exactly the same as the thickness of the original nickel foil, so that the groove 2a can be reliably broken at a predetermined pressure or higher.

上記破裂弁２の上には、環状板３が配置される。環状板３は、円環状のステンレス鋼板である。そして、この環状板３は、外径を破裂弁２の立壁部２ｂの内径よりも小さくすることにより、この立壁部２ｂの内側で円板部２ｃの上面に配置される。この環状板３の板厚は、破裂弁２よりも十分に厚く形成されたものである。また、この環状板３の孔径は、ガスの排出を円滑に行うために、通常は貫通孔１ｃよりも大きな径となるようにしている。   An annular plate 3 is disposed on the rupture valve 2. The annular plate 3 is an annular stainless steel plate. The annular plate 3 is arranged on the upper surface of the disc portion 2c inside the standing wall portion 2b by making the outer diameter smaller than the inner diameter of the standing wall portion 2b of the rupture valve 2. The plate thickness of the annular plate 3 is sufficiently thicker than that of the rupture valve 2. The hole diameter of the annular plate 3 is usually larger than the through hole 1c in order to smoothly discharge the gas.

上記のようにして凹部１ａの底面１ｂ上に重ねて配置された破裂弁２と環状板３は、レーザ溶接によりこの底面１ｂに接合される。即ち、環状板３の上方からレーザ光を照射することにより、この環状板３のステンレス鋼と破裂弁２のニッケル箔と底面１ｂ付近の蓋板１のステンレス鋼とを溶融一体化させることにより接合する。また、このレーザ溶接による接合は、貫通孔１ｃの周囲を全周にわたって行われるので、この貫通孔１ｃは、破裂弁２に完全に覆われて封口されることになる。環状板３は、薄いニッケル箔からなる破裂弁２がレーザ溶接の熱によって破断するのを防止し、この破裂弁２が確実に底面１ｂに溶着されるようにするために、押さえ板として配置している。なお、これらの破裂弁２と環状板３は、事前に貫通孔１ｃの周囲数箇所にわたって抵抗溶接により仮止めしておくことにより、レーザ溶接時の密着性を高めて接合が確実に行われるようにすることが好ましい。   The rupture valve 2 and the annular plate 3 arranged so as to overlap the bottom surface 1b of the recess 1a as described above are joined to the bottom surface 1b by laser welding. That is, by irradiating laser light from above the annular plate 3, the stainless steel of the annular plate 3, the nickel foil of the rupture valve 2, and the stainless steel of the lid plate 1 near the bottom surface 1b are fused and integrated. To do. Further, since the joining by laser welding is performed over the entire circumference of the through hole 1c, the through hole 1c is completely covered and sealed by the rupture valve 2. The annular plate 3 is disposed as a pressing plate in order to prevent the burst valve 2 made of a thin nickel foil from being broken by the heat of laser welding and to ensure that the burst valve 2 is welded to the bottom surface 1b. ing. The rupture valve 2 and the annular plate 3 are preliminarily fixed by resistance welding over several places around the through hole 1c in advance, so that the adhesion at the time of laser welding is improved and the joining is reliably performed. It is preferable to make it.

上記構成の非水電解質二次電池は、蓋板１と電池缶４からなる電池容器内部の電池内圧が貫通孔１ｃを通して破裂弁２の下面に加わることになる。そして、例えば外部短絡による発熱等によって、この電池内圧が異常に上昇し所定値を超えると、破裂弁２の溝２ａが破断して高圧ガスを外部に排出することにより、この電池内圧上昇による危険を防止することができる。   In the non-aqueous electrolyte secondary battery having the above-described configuration, the battery internal pressure inside the battery container composed of the cover plate 1 and the battery can 4 is applied to the lower surface of the rupture valve 2 through the through hole 1c. When the internal pressure of the battery is abnormally increased due to, for example, heat generation due to an external short circuit and exceeds a predetermined value, the groove 2a of the rupture valve 2 is broken to discharge the high-pressure gas to the outside. Can be prevented.

また、上記構成の破裂弁２は、単なる円板状ではなく、周縁部に立壁部２ｂが形成されているので、プレス加工により打ち抜かれた際に円板部２ｃが確実に平坦な状態となるようにしておけば、この立壁部２ｂがリブの役割を果たし、後の溝２ａの形成工程や組み立て作業の際のハンドリング時や抵抗溶接による仮止め時等に歪みや反りが生じるようなことがなくなる。従って、この破裂弁２は、蓋板１の凹部１ａの平坦な底面１ｂに密接して配置されると共に、平坦な環状板３によって全周にわたり十分に押さえ付けられるので、確実に接合されるようになる。しかも、この破裂弁２は、円板部２ｃに歪みや反りが生じないので、抵抗溶接時やレーザ溶接時にこの歪みや反りを無理に矯正されて溝２ａに亀裂が生じるようなこともなくなる。さらに、この破裂弁２は、立壁部２ｂが凹部１ａの側面に沿って円滑に挿入されるので、この側面に引っ掛かるようなことが少なくなり、もし引っ掛かって斜めに挿入されたとしても、立壁部２ｂの上端が凹部１ａからはみ出すので、抵抗溶接やレーザ溶接を行う前に発見し易くなる。従って、この破裂弁２が凹部１ａに斜めに挿入されることにより、レーザ溶接による接合が不十分になるようなこともなくなる。   Further, the burst valve 2 having the above-described configuration is not a simple disc shape, and the standing wall portion 2b is formed at the peripheral portion, so that the disc portion 2c is surely flat when punched by press working. If this is done, the standing wall 2b may act as a rib, and distortion or warping may occur during the subsequent process of forming the groove 2a, handling during assembly work, or temporary fixing by resistance welding. Disappear. Therefore, the rupture valve 2 is disposed in close contact with the flat bottom surface 1b of the recess 1a of the cover plate 1 and is sufficiently pressed down by the flat annular plate 3 so that it can be reliably joined. become. In addition, since the burst valve 2 does not cause distortion or warpage in the disc portion 2c, the distortion or warpage is not forcibly corrected at the time of resistance welding or laser welding, and the groove 2a is not cracked. Further, since the rupture valve 2 is smoothly inserted along the side surface of the concave portion 1a, the rupture valve 2 is less likely to be caught on the side surface. Since the upper end of 2b protrudes from the recessed part 1a, it becomes easy to find before performing resistance welding or laser welding. Therefore, the burst valve 2 is inserted into the recess 1a at an angle, so that joining by laser welding is not insufficient.

なお、上記実施形態では、破裂弁２の円板部２ｃの周縁部に、全周にわたって立壁部２ｂを形成する場合を示したが、この円板部２ｃの周縁部の一部に立壁部２ｂが形成されるようにしても同様の効果を得ることができる。即ち、例えば図３に示すように円板部２ｃの周縁部に複数の立壁部２ｂを間隔をあけて形成するようにしてもよい。また、上記実施形態では、ニッケル箔からなる破裂弁２を用いる場合を示したが、所定の圧力で確実に破断し電解液等に対する耐食性も有するものであれば、その他の任意の金属製の破裂弁２を用いることができる。さらに、上記実施形態では、円板部２ｃの中央部に十字形の溝２ａを設けた破裂弁２を示したが、この溝２ａの形状は任意であり、所定の圧力以上で確実に破断するのであれば、溝２ａのない破裂弁２を用いることもできる。   In the above embodiment, the case where the standing wall portion 2b is formed on the entire periphery of the peripheral portion of the disc portion 2c of the rupture valve 2 is shown. However, the standing wall portion 2b is formed on a part of the peripheral portion of the disc portion 2c. The same effect can be obtained even if is formed. That is, for example, as shown in FIG. 3, a plurality of standing wall portions 2b may be formed at intervals in the peripheral edge portion of the disc portion 2c. Moreover, although the case where the burst valve 2 made of nickel foil is used has been described in the above embodiment, any other metal burst as long as it is reliably ruptured at a predetermined pressure and has corrosion resistance against an electrolytic solution or the like. Valve 2 can be used. Furthermore, in the above-described embodiment, the rupture valve 2 provided with the cross-shaped groove 2a at the center of the disk portion 2c is shown. However, the shape of the groove 2a is arbitrary and can be reliably broken at a predetermined pressure or higher. In this case, the burst valve 2 without the groove 2a can be used.

また、上記実施形態では、凹部１ａと破裂弁２と環状板３が円形である場合を示したが、これらの形状も任意である。即ち、図４に示すように、凹部１ａと破裂弁２と環状板３を方形とすることもできる。さらに、環状板３は、周縁部より内側に、破裂弁２が破断した場合のガス抜き用の通気口があればよいので、外周と同じ形状の孔が形成される必要はない。しかも、この内側の孔には、真上へのガスの噴出を避けるためにガイド板等が設けられていてもよい。さらに、この環状板３は、破裂弁２の立壁部２ｂの内側に嵌まり込むような、この立壁部２ｂと同様の形状の立壁部が周縁部に形成されていてもよい。環状板３にこのような立壁部が設けられると、破裂弁２の場合と同様に、歪みや反りが生じるのを防ぐことができる。   Moreover, in the said embodiment, although the case where the recessed part 1a, the rupture valve 2, and the annular plate 3 were circular was shown, these shapes are also arbitrary. That is, as shown in FIG. 4, the concave portion 1a, the rupture valve 2 and the annular plate 3 can be rectangular. Furthermore, since the annular plate 3 only needs to have a vent hole for venting gas when the rupture valve 2 is broken inside the peripheral edge portion, it is not necessary to form a hole having the same shape as the outer periphery. In addition, a guide plate or the like may be provided in the inner hole in order to avoid the ejection of gas directly above. Further, the annular plate 3 may be formed with a standing wall portion having the same shape as the standing wall portion 2 b at the peripheral edge so as to be fitted inside the standing wall portion 2 b of the burst valve 2. When such an upright wall portion is provided on the annular plate 3, it is possible to prevent distortion and warpage from occurring as in the case of the burst valve 2.

また、上記実施形態では、蓋板１と電池缶４と環状板３がステンレス鋼製である場合を示したが、これらの金属材料もそれぞれ任意である。さらに、上記実施形態では、蓋板１に安全弁を設ける場合を示したが、この安全弁は、電池容器のいずれの場所に設けてもよいので、電池缶４に設けることもできる。さらに、上記実施形態では、電池容器を蓋板１と電池缶４とで構成する場合を示したが、この電池容器の構成も任意である。さらに、上記実施形態では、非水電解質二次電池について説明したが、安全弁を必要とする電池であれば、どのような種類の電池にも同様に実施可能である。   Moreover, in the said embodiment, although the case where the cover plate 1, the battery can 4, and the annular plate 3 were made from stainless steel was shown, these metal materials are also arbitrary, respectively. Furthermore, although the case where the safety valve was provided in the cover plate 1 was shown in the said embodiment, since this safety valve may be provided in any place of a battery container, it can also be provided in the battery can 4. FIG. Furthermore, in the said embodiment, although the case where a battery container was comprised with the cover plate 1 and the battery can 4 was shown, the structure of this battery container is also arbitrary. Furthermore, although the said embodiment demonstrated the non-aqueous electrolyte secondary battery, if it is a battery which requires a safety valve, it can implement similarly to what kind of battery.

本発明の一実施形態を示すものであって、蓋板に設けた安全弁の構成を示す部分断面斜視図である。1 is a partial cross-sectional perspective view showing a configuration of a safety valve provided on a lid plate according to an embodiment of the present invention. 本発明の一実施形態を示すものであって、安全弁を設けた非水電解質二次電池の構造を示す一部省略縦断面正面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially omitted vertical cross-sectional front view showing a structure of a nonaqueous electrolyte secondary battery provided with a safety valve according to an embodiment of the present invention. 本発明の一実施形態を示すものであって、破裂弁の他の構成例を示す斜視図である。FIG. 10 is a perspective view showing another embodiment of the present invention and showing another configuration example of the rupture valve. 本発明の一実施形態を示すものであって、蓋板に設けた安全弁の他の構成例を示す部分断面斜視図である。FIG. 5 is a partial cross-sectional perspective view showing another embodiment of the present invention and showing another configuration example of the safety valve provided on the cover plate. 従来例を示すものであって、蓋板に設けた安全弁の構成を示す部分断面斜視図である。It is a fragmentary sectional perspective view which shows a prior art example and shows the structure of the safety valve provided in the cover plate.

符号の説明Explanation of symbols

１ 蓋板
１ａ 凹部
１ｂ 底面
１ｃ 貫通孔
２ 破裂弁
２ｂ 立壁部
３ 環状板 DESCRIPTION OF SYMBOLS 1 Cover plate 1a Concave part 1b Bottom face 1c Through-hole 2 Rupture valve 2b Standing wall part 3 Annular board

Claims (1)

金属製電池容器の表面に形成された凹部であって、この凹部の底面の一部に内部への貫通孔が形成され、この凹部内で貫通孔を塞ぐように底面に配置された金属製破裂弁と、この凹部内で金属製破裂弁を押さえるために配置された金属製環状体とを備え、この凹部の底面と金属製破裂弁と金属製環状体とが貫通孔の周囲で接合された電池において、
金属製破裂弁の周縁部に、凹部の側面に沿う立壁部が形成されたことを特徴とする電池。 A metal rupture formed on the surface of the metal battery container, wherein a through-hole is formed in a part of the bottom surface of the recess, and the through-hole is disposed in the recess to close the through-hole. A valve and a metal annular body arranged to hold the metal rupture valve in the recess, and the bottom surface of the recess, the metal rupture valve, and the metal annular body are joined around the through-hole. In batteries,
A battery characterized in that a standing wall portion along the side surface of the concave portion is formed at the peripheral edge portion of the metal burst valve.
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EP3223333A1 (en) * 2016-03-22 2017-09-27 Samsung SDI Co., Ltd Rechargeable battery

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