JP5198723B2 - Sealing plate for sealed battery - Google Patents

Sealing plate for sealed battery Download PDF

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JP5198723B2
JP5198723B2 JP2005172491A JP2005172491A JP5198723B2 JP 5198723 B2 JP5198723 B2 JP 5198723B2 JP 2005172491 A JP2005172491 A JP 2005172491A JP 2005172491 A JP2005172491 A JP 2005172491A JP 5198723 B2 JP5198723 B2 JP 5198723B2
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base material
sealing plate
valve
protrusion
valve portion
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JP2006351234A (en
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敏弘 小田垣
和哉 中村
啓 藤井
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FUJI SPRINGS CO., INC.
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FUJI SPRINGS CO., INC.
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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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  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Description

この発明は、例えばリチウムイオン電池などの密閉型電池に用いられる密閉型電池用封口板とその製造金型及び製造方法に関するものである。   The present invention relates to a sealing plate for a sealed battery used for a sealed battery such as a lithium ion battery, a manufacturing mold and a manufacturing method thereof.

例えば、リチウムイオン電池などの密閉型の二次電池では、安全弁を設けて異常が生じた際に電池内圧を開放しなければならない。   For example, in a sealed secondary battery such as a lithium ion battery, a safety valve is provided and the internal pressure of the battery must be released when an abnormality occurs.

そのための一つの方法として、（特許文献１）には、図９に示すような電池ケース１を密閉する封口板２に、２度の圧印加工（コイニング）により弁機能を付与したものが記載されている。   As one method therefor, (Patent Document 1) describes a sealing plate 2 that seals a battery case 1 as shown in FIG. 9 provided with a valve function by coining two times. ing.

すなわち、この封口板２では、第１のコイニング加工により凹部３を成形する。このとき、成形された凹部３の底面は平坦な薄板状に形成する。さらに、その第１のコイニングにより成形した凹部３の底面に、第２のコイニング加工によってＳ状の溝４を成形し、その溝４を成形した凹部３を、図９のように開口側に膨出させたものである。このように膨出させた封口板２の凹部３は、溝４の部分で肉厚が最小となる。そのため、ケース１の内圧が、この肉厚が最小となった溝４部分の設定破断圧力を超えると、順次破断して内圧を開放させるというものである。
特開２００２−３６７５８３号公報 That is, in the sealing plate 2, the recess 3 is formed by the first coining process. At this time, the bottom surface of the formed recess 3 is formed into a flat thin plate shape. Further, an S-shaped groove 4 is formed on the bottom surface of the concave portion 3 formed by the first coining by a second coining process, and the concave portion 3 formed with the groove 4 is expanded to the opening side as shown in FIG. It was made to come out. The concave portion 3 of the sealing plate 2 thus bulged has a minimum thickness at the groove 4 portion. Therefore, when the internal pressure of the case 1 exceeds the set breaking pressure of the groove 4 portion where the wall thickness is minimized, the internal pressure is released sequentially.
Japanese Patent Laid-Open No. 2002-367583

しかしながら、上記のようにコイニング加工を行うものでは、特に、第１のコイニング加工の際に発生する余肉により、基材内部に微小割れ（マイクロクラック）を生じてしまう問題がある。   However, in the case where the coining process is performed as described above, there is a problem that micro cracks are generated inside the base material due to the surplus generated during the first coining process.

すなわち、上記のようなコイニング加工では、図１０の（ａ）→（ｃ）のように、圧印が進むと平板であった基材１０が圧縮されて密度が高くなる部位と、応力により変形して増肉する部位ができる。このように基材１０に疎密な部分ができることからメタルフローが波状的に起きて、図１０（ｃ）のように、断面に微小割れ６を生じて内部破断を起こしてしまう。その結果、弁部のシール性が損なわれ、致命的欠陥を生じてしまう問題がある。 そこで、この発明の課題は、コイニング加工により成形する際の不整合なメタルフローにより発生する欠陥を解消すること、同時に、その余肉を利用して脆弱な弁部周辺を肉付けして保護または補強あるいはその両方をすることである。   That is, in the coining process as described above, as indicated by (a) → (c) in FIG. 10, the flattened base material 10 is compressed and the density is increased as the impression proceeds, and deformation occurs due to stress. To increase the thickness. Since a dense portion is formed in the base material 10 in this way, the metal flow occurs in a wave shape, and as shown in FIG. 10C, a microcrack 6 is generated in the cross section, causing internal fracture. As a result, there is a problem that the sealing performance of the valve portion is impaired and a fatal defect is generated. Therefore, an object of the present invention is to eliminate defects caused by inconsistent metal flow when forming by coining, and at the same time, use the surplus to flesh around the vulnerable valve part to protect or reinforce Or do both.

上記の課題を解決するため、この発明では、封口版の基材を薄膜に成形した弁部の近傍に、基材部分を設けて、当該基材部分の外側に弁部の成形時の余肉でもって満たされた突部を成形した構成を採用したのである。 In order to solve the above-described problems, in the present invention, a base material portion is provided in the vicinity of a valve portion in which the base material of the sealing plate is formed into a thin film, and a surplus at the time of molding the valve portion is formed outside the base material portion. Thus, a configuration in which the projecting portion filled with the molding was formed was adopted.

このような構成を採用したことにより、弁部を薄膜（薄板）に成形（圧印：プレス加工）した際に波状的に生じるメタルフローを弁部の近傍に突部を成形して逃がす（収容する）。その際、その突部を脆弱な弁部の周辺に成形することにより、その脆弱な部分を保護したり補強したりする。   By adopting such a structure, the metal flow generated in a wave shape when the valve part is formed into a thin film (thin plate) is formed in the vicinity of the valve part to escape (accommodate). ). At that time, by forming the protrusion around the fragile valve portion, the fragile portion is protected or reinforced.

なお、上記成形時の余肉とは、圧印（プレス加工）によりはみ出す基材の量（肉量）とするものである。   In addition, the surplus at the time of the said shaping | molding is made into the quantity (wall quantity) of the base material which protrudes by pressure stamping (press work).

このとき、突部を弁部の周囲を取り囲むように、あるいは弁部を介して対向して成形する構成を採用することができる。   At this time, the structure which shape | molds a protrusion so that it may surround the circumference | surroundings of a valve part or through a valve part can be employ | adopted.

このような構成を採用し、突部を、弁部の周囲を取り囲むように、あるいは弁部を介して対向して設けたことにより、例えば、脆弱な弁部の周囲あるいは弁部の対向する側部の厚みは成形した突部の分だけ厚くなり、剛性を増すので、それらに囲まれたあるいは挟まれた弁部を保護することができる。   By adopting such a configuration, the protrusions are provided so as to surround the periphery of the valve part or opposed to each other via the valve part, for example, around the fragile valve part or the opposite side of the valve part. Since the thickness of the portion is increased by the amount of the molded protrusion and the rigidity is increased, the valve portion surrounded or sandwiched between them can be protected.

この発明は、以上のように構成したことにより、コイニングの際に波状的に生じるメタルフローを逃がす（収容する）ことができるので、内部破断を生じないようにできる。その結果、致命的な欠陥を生じないようにして弁部に良好なシール性を付与できる。また、同時に、その余肉を利用して脆弱な弁部周辺を肉付けして保護または補強あるいはその両方を行うことができる。   Since the present invention is configured as described above, it is possible to escape (accommodate) a metal flow generated in a wave shape during coining, so that internal breakage can be prevented. As a result, it is possible to give a good sealing property to the valve portion without causing a fatal defect. At the same time, the surplus meat can be used to thicken the periphery of the fragile valve portion for protection and / or reinforcement.

以下、この発明を実施するための最良の形態を図面に基づいて説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings.

図１に、この形態の封口板２’を示す。前記封口板２’は、基材１０を薄膜に成形した弁部１１の近傍に突部１４を成形したものである。但し、図１のものは、コイニング加工直後のもので、後述するような補助成形による刻印を成形していないものである。このようなコイニング加工直後のものを示したのは、本願発明をより理解し易くするためである。   FIG. 1 shows this type of sealing plate 2 '. The sealing plate 2 ′ is obtained by forming a protrusion 14 in the vicinity of the valve portion 11 formed by forming the base material 10 into a thin film. However, the thing of FIG. 1 is a thing just after coining process, and does not shape | mold the stamp by auxiliary molding which is mentioned later. The reason for showing the one immediately after the coining is to make the present invention easier to understand.

前記基材１０は、アルミニウム合金製で、電池ケースの開口に合わせた角型（これ以外にも丸型のものもあるので形状には限定されない）に形成されたものである。また、この角型の周囲には、フランジを設けて電池ケースの開口と接合するようにしてある。さらに、基材１０の中央には、図１のように薄膜に形成した弁部１１が設けられている。ちなみに、この弁部１１の両側には、後述するように後工程によって端子を取り付けるための貫通孔が設けられる。   The base material 10 is made of an aluminum alloy, and is formed into a square shape (not limited to the shape because there are other round shapes) that match the opening of the battery case. In addition, a flange is provided around the square so as to be joined to the opening of the battery case. Further, a valve portion 11 formed in a thin film as shown in FIG. Incidentally, on both sides of the valve portion 11, through holes for attaching terminals in a subsequent process are provided as will be described later.

一方、弁部１１は小判形に成形され、その小判形の底面は図２のように平坦な薄膜状に成形されている。この弁部１１の近傍には、すなわち、この形態では小判形の弁部１１の周囲に、弁部１１を取り囲むようにして突部１４を成形してある（突部はこれに限定されることはなく、後述するように例えば、弁部を介して対向させて設けるなど様々な形態が考えられる）。また、ここでは突部１４は、図２のように基材１０の裏面側にも成形してある。   On the other hand, the valve portion 11 is formed into an oval shape, and the bottom surface of the oval shape is formed into a flat thin film as shown in FIG. A protrusion 14 is formed in the vicinity of the valve portion 11, that is, around the oval valve portion 11 in this form so as to surround the valve portion 11 (the protrusion is limited to this). However, as will be described later, various forms such as, for example, facing each other through a valve portion are conceivable). Here, the protrusions 14 are also formed on the back side of the substrate 10 as shown in FIG.

この形態は、上記のように構成されており、この封口板２’では、例えばコイニング加工により、図３のように波状的にメタルフロー１５が発生すると、その発生したメタルフロー１５を突部１４に成形して逃がしているので、基材１０の密度に粗密な部分や増肉する部分ができにくい。そのため、微小割れ（マイクロクラック）を生じることはなく、微小割れを基材内部に生じて内部破断を生じてしまうこともない。その結果、弁部１１に良好なシール性を付与できる。   This configuration is configured as described above. When the metal flow 15 is generated in a wave shape as shown in FIG. 3 by coining, for example, in the sealing plate 2 ′, the generated metal flow 15 is transferred to the protrusion 14. Therefore, it is difficult to form a portion that is dense or thick in the density of the base material 10. For this reason, micro cracks (micro cracks) are not generated, and micro cracks are not generated inside the substrate and internal breakage is not generated. As a result, good sealing performance can be imparted to the valve portion 11.

また、このように構成される突部１４は、基材１０よりも厚くなっているので、周囲を取り囲んだ薄膜状の脆弱な弁部１１を外力（例えば、曲げ圧力など）から保護することができる。   Further, since the protrusion 14 configured as described above is thicker than the base material 10, the thin fragile valve portion 11 surrounding the periphery can be protected from external force (for example, bending pressure). it can.

次に、このような封口板２’を成形するためのコイニング用（転写用）金型について述べる。   Next, a coining (transfer) mold for forming such a sealing plate 2 'will be described.

すなわち、封口板２’を成形する金型は、図４（ａ）のように、パンチ２０のパンチ型２１とダイ２２の受け型２３に、ポケット２４と肉止め２５を形成したものである。   That is, the mold for forming the sealing plate 2 ′ is one in which a pocket 24 and a meat stopper 25 are formed in a punch die 21 of a punch 20 and a receiving die 23 of a die 22 as shown in FIG.

このように構成した金型で基材１０を圧印すると、図４（ｂ）のように、弁部１１の薄膜部分からの基材のメタルフロー１５をポケット２４に収容する。その際、ポケット２４に収容したメタルフロー１５は、肉止め２５によってストップさせてポケット２４をちょうど満たすようにする。こうすることで、密度が高くなったり、応力により変形して増肉が起きたりしないようにして均一な突部１４を成形する。そのため、このように弁部１１の圧印によるメタルフロー１５でポケット２４がちょうど満たされるように、ポケット２４の大きさと肉止め２５の位置を設計する。   When the base material 10 is pressed with the mold configured as described above, the metal flow 15 of the base material from the thin film portion of the valve portion 11 is accommodated in the pocket 24 as shown in FIG. At that time, the metal flow 15 accommodated in the pocket 24 is stopped by the meat stopper 25 so that the pocket 24 is just filled. By doing so, the uniform protrusions 14 are formed so as not to increase the density or to be deformed by stress to increase the thickness. Therefore, the size of the pocket 24 and the position of the meat stopper 25 are designed so that the pocket 24 is just filled with the metal flow 15 by the pressure of the valve portion 11 in this way.

したがって、このようにメタルフロー１５をポケット２４に吸収させたことにより、メタルフロー１５が波状的に重なることはなく、基材１０の密度に疎密な部分ができにくい。したがって、微小割れを生じることはなく、微小割れを基材の内部に生じて内部破断を生じることもない。その結果、弁部１１に良好なシール性を付与できる。   Therefore, by absorbing the metal flow 15 in the pocket 24 in this way, the metal flow 15 does not overlap in a wave shape, and it is difficult to form a portion with a dense density of the base material 10. Therefore, the micro crack does not occur, and the micro crack is generated inside the base material and the internal fracture is not generated. As a result, good sealing performance can be imparted to the valve portion 11.

図５ａは、上記の肉止め２５を図４（ａ）のパンチ２０とダイ２２と別体としたもので、別体とした肉止め２５を成形時に弾性体２６を介して押し圧力を印加して、基材１０に接するようにしたものである。   FIG. 5A shows the above-described meat stopper 25 as a separate body from the punch 20 and the die 22 shown in FIG. 4A. A pressing force is applied to the separate meat stopper 25 via an elastic body 26 during molding. Thus, the substrate 10 is in contact with the substrate 10.

このようにすることにより、肉止め２５が作動するタイミングを弾性体２６の弾性圧で調整し、メタルフロー１５の量を調整する。   By doing in this way, the timing which the meat stop 25 act | operates is adjusted with the elastic pressure of the elastic body 26, and the quantity of the metal flow 15 is adjusted.

すなわち、この形態では、パンチ２０側の肉止め２５は、ＡとＢの二つの種類があって、Ａの肉止め２５は、ストッパー面を傾斜面として、パンチ２０から離れる側の隙間が狭くなるようにしてある。一方、ダイ２２側の肉止め２５は、ダイホルダーに形成してある。   In other words, in this embodiment, there are two types of material stoppers 25 on the punch 20 side, A and B, and the material stopper 25 of A has a stopper surface as an inclined surface, and the gap on the side away from the punch 20 becomes narrower. It is like that. On the other hand, the meat stopper 25 on the die 22 side is formed in the die holder.

また、各肉止め２５とプレスのバックプレート２７間に弾性体２６を取り付けて、圧印時に基材１０へ押し圧を印加するようにしてある。   Further, an elastic body 26 is attached between each of the meat stoppers 25 and the back plate 27 of the press so that a pressing pressure is applied to the substrate 10 at the time of pressing.

なお、ここでは、弾性体２６にスプリングを用いているが、これ以外にもウレタンや油圧ダンパー等を用いることができる。   Here, a spring is used for the elastic body 26, but urethane, a hydraulic damper, or the like can be used in addition to this.

その際、弾性体２６であるスプリングの長さと、スプリングの弾性圧を仕上がりやメタルフロー１５の流れを予測して選択することにより、メタルフロー１５の制御を行う。例えば、図５ａのものでは、Ａの肉止め２５よりＢの肉止め２５のスプリングを強く設定してあるが、このように設定することで、図５ｂのように基材１０へ圧印を行うと、Ｂの肉止め２５がＡの肉止め２５より基材１０に強く圧接してメタルフロー１５の流れを止めて、図５ｂのように、突部１４を成形することができる。   At that time, the metal flow 15 is controlled by selecting the length of the spring which is the elastic body 26 and the elastic pressure of the spring by predicting the finish and the flow of the metal flow 15. For example, in the case of FIG. 5a, the spring of the B meat stopper 25 is set stronger than the A meat stopper 25, but by setting in this way, when the impression is applied to the substrate 10 as shown in FIG. The protrusion 14 can be formed as shown in FIG. 5B by stopping the flow of the metal flow 15 by pressing the metal stopper 15 more strongly against the base material 10 than the stopper 25 of A.

次に、上記金型を使用した封口板２’の製造方法について述べる。この製造方法では、コイル状の基材１０を定寸送りとしてプレス加工する（プレス順送り方法）もので、図６のように、
１．パイロット孔開け加工（抜き加工）
２．スリット加工
３．予備コイニングによる圧縮加工、
４．本コイニグ成形
５．補助成形
６．孔開け加工（抜き加工）
７．トリミング加工（抜き加工）
の７工程で構成される。 Next, the manufacturing method of sealing plate 2 'using the said metal mold | die is described. In this manufacturing method, the coil-shaped base material 10 is pressed as a fixed-size feed (press progressive feed method), as shown in FIG.
1. Pilot drilling (punching)
2. 2. Slit processing Compression processing by preliminary coining,
4). 4. Coinig molding Auxiliary molding Drilling (punching)
7). Trimming (Punching)
It consists of seven steps.

すなわち、パイロット孔開け加工は、パイロットピンによる送り位置決めをするための金型加工で、パイロット孔加工ができると、定寸送りを行ってスリット加工を行う。   That is, the pilot drilling process is a mold process for feed positioning by a pilot pin. When the pilot hole process can be performed, a constant dimension feed is performed to perform a slit process.

スリット加工は、コイル状の基材１０から１枚分の封口板２’を切り出すための工程で、１枚の封口板２’に要する基材１０の面積の周囲にスリット３０を入れて加工する。スリット加工ができると予備コイニングを行う。   The slit processing is a process for cutting out one sealing plate 2 ′ from the coil-shaped base material 10, and is processed by inserting a slit 30 around the area of the base material 10 required for one sealing plate 2 ′. . When slitting is possible, preliminary coining is performed.

予備コイニングは、封口板２’で大きなメタルフロー１５が予測される部位に予備圧縮を行うもので、この予備圧縮は、封口板のサイズや形状によって省略してもよい。   The preliminary coining is to perform preliminary compression on a portion where a large metal flow 15 is predicted on the sealing plate 2 ′, and this preliminary compression may be omitted depending on the size and shape of the sealing plate.

本コイニングは、先の図５ａ、図５ｂで述べた金型を使用して行う加工で、前述したように金型に基材１０のメタルフロー１５を拘束するためのストッパー機能を有する肉止め２５を使用する。また、肉の移動を予測してメタルフロー１５を逃がす（収容する）ためにポケット２４を設け、肉を多く集めたい場所や動きを自由にして肉の流れを積極的に誘う構造とする。   This coining is a process performed using the mold described in FIGS. 5a and 5b, and as described above, the meat stopper 25 having a stopper function for constraining the metal flow 15 of the substrate 10 to the mold. Is used. In addition, a pocket 24 is provided for predicting the movement of the meat and escaping (accommodating) the metal flow 15, and a structure that actively invites the flow of the meat by freeing a place and movement where a large amount of meat is to be collected is provided.

また、圧印の際の基材１０に対してパンチ２０が侵入すると、平板の状態であった基材１０が圧縮されて密度の高くなる部位と、応力により変形して増肉する部位ができるが、このとき、肉止め２５は反力を受ける。この反力に対しては、弾性体（スプリング）２６の強弱を利用して可動タイミングを合わせることにより、薄膜（板）成形された弁部の近傍にメタルフロー１５を吸収した突部１４を成形する。   Further, when the punch 20 enters the base material 10 at the time of the coining, the base material 10 which has been in a flat plate state is compressed, and a portion where the density is increased and a portion where the thickness is deformed due to the stress are increased. At this time, the meat stopper 25 receives a reaction force. For this reaction force, the projecting portion 14 that absorbs the metal flow 15 is formed in the vicinity of the valve portion formed with a thin film (plate) by using the strength of the elastic body (spring) 26 to adjust the moving timing. To do.

突部１４の成形が完了すると、補助成形として弁部の薄膜（板）への刻印加工や成形をする。次に、抜き加工により、部品として必要な端子用の孔開け加工などを行う。そして、外周部の形状を維持しながらトリミング加工をする。トリミングされた製品は、変形やキズなどの不具合がないように取り出す。   When the forming of the protrusion 14 is completed, the stamping process or forming on the thin film (plate) of the valve part is performed as auxiliary forming. Next, a hole for a terminal necessary as a part is formed by punching. Then, trimming is performed while maintaining the shape of the outer peripheral portion. The trimmed product is taken out so that there are no defects such as deformation and scratches.

こうして製造される封口板は、コイニングの際に波状的に生じるメタルフロー１５を突部１４に成形して逃がす（収容する）ことができるので、致命的欠陥である内部破断を生じない。そのため、弁部１１のシール性を向上させることができる。   The sealing plate manufactured in this way can cause the metal flow 15 generated in a wave shape at the time of coining to be formed and escaped (accommodated) in the protrusion 14, so that the internal fracture that is a fatal defect does not occur. Therefore, the sealing performance of the valve part 11 can be improved.

この実施例は、弁部及び突部の形状を示すもので、図７（ａ）は、弁部１１を小判形として、その周囲に突部１４を成形した実施形態のものを示す。また、図７（ｂ）と（ｃ）は、弁部１１を介して突部１４を対向して成形した態様を示すもので、平面図と断面図を併記してある。さらに、図７のものを含む他の態様を分類して図８ａ、図８ｂに示す。   This example shows the shape of the valve portion and the protrusion, and FIG. 7A shows an embodiment in which the valve portion 11 is an oval shape and the protrusion 14 is formed around it. FIGS. 7B and 7C show a mode in which the protrusions 14 are formed to face each other via the valve portion 11, and a plan view and a sectional view are shown together. Furthermore, other modes including those of FIG. 7 are classified and shown in FIGS. 8a and 8b.

実施形態の斜視図Perspective view of an embodiment 実施形態の要部の断面図Sectional drawing of the principal part of embodiment 実施形態の作用説明図Action explanatory diagram of the embodiment 実施形態の作用説明図Action explanatory diagram of the embodiment 実施形態の作用説明図Action explanatory diagram of the embodiment 実施形態の作用説明図Action explanatory diagram of the embodiment 実施形態の作用説明図Action explanatory diagram of the embodiment （ａ）、（ｂ）、（ｃ）実施例１の平面図及び断面図(A), (b), (c) Plan view and sectional view of Example 1 実施例１の平面図Plan view of Example 1 実施例１の平面図Plan view of Example 1 従来例の断面図Cross section of conventional example 従来例の作用説明図Action explanatory diagram of conventional example

符号の説明Explanation of symbols

２’ 封口板
１０ 基材
１１ 弁部
１４ 突部
１５ メタルフロー
２０ パンチ
２１ パンチ型
２２ ダイ
２３ 受け型
２４ ポケット
２５ 肉止め
２６ 弾性体 2 'Sealing plate 10 Base material 11 Valve portion 14 Protrusion portion 15 Metal flow 20 Punch 21 Punch die 22 Die 23 Receiving die 24 Pocket 25 Meat stopper 26 Elastic body

Claims (2)

アルミニウム基材（１０）を薄膜に成形した弁部（１１）の近傍に、基材部分を設けて、当該基材部分の外側に弁部（１１）の成形時の余肉でもって満たされた突部（１４）を成形し、かつ、前記突部（１４）で脆弱な弁部（１１）の周辺を保護または補強あるいはその両方を行うことを特徴とする密閉型電池用封口板（２´）。 A base material portion was provided in the vicinity of the valve portion (11) in which the aluminum base material (10) was formed into a thin film, and the outer portion of the base material portion was filled with a surplus at the time of forming the valve portion (11) . A sealing battery sealing plate (2 ') characterized in that a protrusion (14) is formed and the periphery of the fragile valve part (11) is protected and / or reinforced by the protrusion (14). ). 上記突部（１４）を弁部（１１）の周囲を取り囲むように、あるいは、弁部（１１）を介して対向して形成した請求項１に記載の密閉型電池用封口板（２´）。 So as to surround the periphery of the protrusion valve portion (14) (11), or sealed battery sealing plate according to claim 1 which is formed opposite via a valve unit (11) (2 ') .
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