JPH09199104A - Explosion-proof sealing plate for sealed battery - Google Patents
Explosion-proof sealing plate for sealed batteryInfo
- Publication number
- JPH09199104A JPH09199104A JP8007062A JP706296A JPH09199104A JP H09199104 A JPH09199104 A JP H09199104A JP 8007062 A JP8007062 A JP 8007062A JP 706296 A JP706296 A JP 706296A JP H09199104 A JPH09199104 A JP H09199104A
- Authority
- JP
- Japan
- Prior art keywords
- plate
- sealing plate
- metal
- inner terminal
- dish
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、密閉型電池、主に
リチウム二次電池等の高エネルギー密度を有する電池の
封口に用いる、防爆封口板の改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved explosion-proof sealing plate used for sealing a battery having a high energy density such as a sealed battery, mainly a lithium secondary battery.
【０００２】[0002]
【従来の技術】近年、ＡＶ機器あるいはパソコン等の電
子機器のポータブル化、コードレス化が急速に進んでお
り、これらの駆動用電源には、高容量化した各種のアル
カリ蓄電池、あるいはリチウム二次電池に代表される非
水二次電池等に、高エネルギー密度で負荷特性の優れた
密閉型電池としての期待が大きい。2. Description of the Related Art In recent years, portable and cordless electronic equipment such as AV equipment and personal computers have been rapidly developed, and various alkaline storage batteries having high capacity or lithium secondary batteries have been used as power sources for driving these equipment. There are great expectations for non-aqueous secondary batteries represented by the above as sealed batteries with high energy density and excellent load characteristics.
【０００３】ところが、上述した高エネルギー密度の密
閉型非水二次電池は電解液に有機電解液を使用すると同
時に高電圧であるため、電池の密閉に用いる封口板の電
解液と接する金属部品材料にアルミニウムを用いるのが
一般的であった。However, the above-mentioned high energy density sealed non-aqueous secondary battery uses an organic electrolytic solution as an electrolytic solution and at the same time has a high voltage. Therefore, a metal component material which comes into contact with the electrolytic solution of the sealing plate used for sealing the battery. It was common to use aluminum for.
【０００４】一方、充電器を含めた機器の故障、あるい
は誤使用によって、過大な電圧、電流で充電・放電ある
いは外部短絡されるなど電池が異常な状態に置かれた
時、エネルギー密度の高いこれらの電池では、急激に温
度上昇し、電池内部にガスが多量に発生しやすい。この
ため、電池内圧が一定値を越えると、その内圧を利用し
て電池への通電を強制的に断絶する電流遮断機構を付加
している。この電流遮断機構は、電池の内圧が一定値を
越えた時、動作するように設定する必要がある。つま
り、断面が略Ｌ字形で絶縁性のガスケット４内に載置さ
れた弁体と、前記ガスケット４の底面部の内端子板との
溶接部分が一定の圧力以下で剥離する必要がある。On the other hand, when the battery is placed in an abnormal state such as being charged / discharged by an excessive voltage or current or externally short-circuited due to a failure or misuse of a device including a charger, those having high energy density In the battery of No. 2, the temperature rises rapidly and a large amount of gas is likely to be generated inside the battery. Therefore, when the internal pressure of the battery exceeds a certain value, a current interrupting mechanism is added to forcibly cut off the energization of the battery by utilizing the internal pressure. This current cutoff mechanism needs to be set to operate when the internal pressure of the battery exceeds a certain value. That is, it is necessary to separate the welded portion between the valve body placed in the insulating gasket 4 having a substantially L-shaped cross section and the inner terminal plate on the bottom surface of the gasket 4 under a certain pressure.
【０００５】そこで、従来は電池が異常な状態に置かれ
たときの電池内圧を測定し、破裂、発火限界を見極めた
後、この限界圧力以下で電流遮断圧が動作するように、
弁体と内端子板の溶接強度を調整し封口板を製造してい
た。Therefore, conventionally, after measuring the internal pressure of the battery when the battery is placed in an abnormal state and determining the rupture and ignition limits, the current cut-off pressure is operated below this limit pressure.
A sealing plate was manufactured by adjusting the welding strength of the valve body and the inner terminal plate.
【０００６】つまり、ステンレスにＮｉメッキを施した
外部端子板３、ＰＴＣ素子８及びアルミニウム製の弁体
１を断面が略Ｌ字形でポリプロピレン製のガスケット４
内に積重し、前記ガスケット４の底面部に、前記弁体１
に一定の圧力以下で剥離するような強度で溶接して電気
的に接続されたアルミニウム製で通気孔を有する内端子
板２を配設したものを、通気孔及び周縁に立ち上がり部
を有するアルミニウム製の皿状蓋板５内に収容し、前記
皿状蓋板５の立ち上がり部を、内方に折曲加工して封口
板を製造していた。That is, an external terminal plate 3 made of Ni plated on stainless steel, a PTC element 8 and a valve body 1 made of aluminum have a substantially L-shaped cross section and a gasket 4 made of polypropylene.
And the valve body 1 is stacked on the bottom surface of the gasket 4.
The inner terminal plate 2 made of aluminum electrically welded and welded with a strength so as to be peeled off at a certain pressure or less and provided with the inner terminal plate 2 having a ventilation hole is made of aluminum having a rising portion at the ventilation hole and the peripheral edge. The plate-shaped cover plate 5 was housed in the plate-shaped cover plate 5, and the rising portion of the plate-shaped cover plate 5 was bent inward to manufacture the sealing plate.
【０００７】[0007]
【発明が解決しようとする課題】上述のような一定の圧
力以下で動作するような電流遮断機構を設けた封口板に
おいては、電池が異常な状態に置かれた時、できるだけ
早くこの状態から回避するように電流遮断機構を可能な
限り低い電池内圧で動作させる方が最も望ましい。In the sealing plate provided with the current interrupting mechanism that operates at a certain pressure or less as described above, when the battery is placed in an abnormal state, avoiding this state as soon as possible. Therefore, it is most desirable to operate the current cutoff mechanism at the lowest possible battery internal pressure.
【０００８】一方、電流遮断圧があまりにも低すぎる
と、封口板製造及び封口板を電池に組み込む際に受ける
応力によって、断面が略Ｌ字型の絶縁性ガスケット内の
弁体とガスケット底面部の内端子板の溶接部が剥離し
て、つまり、電流遮断機構が誤動作して、封口板として
の機能を失ってしまう恐れがある。On the other hand, if the current cut-off pressure is too low, due to the stress applied when manufacturing the sealing plate and assembling the sealing plate into the battery, the valve body inside the insulating gasket having a substantially L-shaped cross section and the bottom surface of the gasket are formed. There is a possibility that the welded portion of the inner terminal plate may be peeled off, that is, the current cutoff mechanism may malfunction and lose its function as the sealing plate.
【０００９】そこで、電流遮断圧の下限作動圧力を、封
口板製造及び封口板を電池に組み込む際に受ける応力に
耐えるように設定する必要があり、ある限られた狭い範
囲で動作するように電流遮断圧を設定して封口板を製造
することになり、製造上、作りにくい封口板となってい
た。Therefore, it is necessary to set the lower limit operating pressure of the current cutoff pressure so as to withstand the stress applied when manufacturing the sealing plate and assembling the sealing plate into the battery. The sealing plate was manufactured by setting the cutoff pressure, which was a difficult sealing plate to manufacture.
【００１０】前述した、封口板製造及び封口板を電池に
組み込む際の電流遮断圧の誤動作は、封口板製造及び封
口板を電池に組み込む際に受ける応力によって、封口板
のアルミニウム材料の部品、すなわち、内端子板、皿状
蓋板が変形することによって起こるものである。The above-mentioned malfunction of the current cut-off pressure when manufacturing the sealing plate and assembling the sealing plate into the battery is caused by the stress received when manufacturing the sealing plate and assembling the sealing plate into the battery. It is caused by the deformation of the inner terminal plate and the dish-shaped lid plate.
【００１１】本発明は、このような問題を解決するもの
であり、封口板製造及び封口板を電池に組み込む際に受
ける応力による内端子板、皿状蓋板の変形を抑制し、電
流遮断圧の下限作動圧をできるだけ低く設定して、電流
遮断圧の設定範囲を広くすることにより、製造上、作り
やすい封口板を提供するとともに、電池の安全性に優れ
た封口板を提供するものである。The present invention solves such a problem and suppresses the deformation of the inner terminal plate and the dish-shaped lid plate due to the stress applied when manufacturing the sealing plate and assembling the sealing plate into the battery, and the current cutoff voltage is suppressed. The lower limit operating pressure is set as low as possible, and the setting range of the current cutoff pressure is widened to provide a sealing plate that is easy to manufacture in manufacturing and a sealing plate that is excellent in battery safety. .
【００１２】[0012]
【課題を解決するための手段】本発明は上記課題を解決
するために、封口板の内端子板、皿状蓋板のどちらか一
方、または双方に使用する金属板材に、耐力が２０ｋｇ
ｆ／ｍｍ2以上の金属の両面に異種の金属を配した２種
の金属で構成されたクラッド板を使用して、封口板を構
成したものである。According to the present invention, in order to solve the above-mentioned problems, a metal plate material used for either or both of an inner terminal plate of a sealing plate and a plate-like lid plate has a proof stress of 20 kg.
The sealing plate is configured by using a clad plate composed of two kinds of metals in which different kinds of metals are arranged on both surfaces of a metal of f / mm 2 or more.
【００１３】[0013]
【発明の実施の形態】本発明の封口板の内端子板、皿状
蓋板のどちらか一方、好ましくは双方に使用する金属板
材に、耐力が２０ｋｇｆ／ｍｍ2以上の金属の両面に異
種の金属を配した２種の金属で構成されたクラッド板を
使用した封口板は、封口板の内端子板、皿状蓋板にアル
ミニウム材を使用する場合に比べ、封口板製造及び封口
板を電池に組み込む際に受ける応力による内端子板、皿
状蓋板の変形を抑制することが可能である。その結果、
内端子板、皿状蓋板の変形による電流遮断機構の誤動作
発生が極端に減少する。BEST MODE FOR CARRYING OUT THE INVENTION A metal plate material used for either one of the inner terminal plate and the dish-shaped lid plate of the sealing plate of the present invention, preferably for both, is made of a metal having a proof stress of 20 kgf / mm 2 or more. A sealing plate using a clad plate composed of two kinds of metals arranged with metal is used for manufacturing the sealing plate and using the sealing plate as a battery as compared with the case where an aluminum material is used for the inner terminal plate of the sealing plate and the dish-shaped cover plate. It is possible to suppress the deformation of the inner terminal plate and the dish-shaped lid plate due to the stress received during the assembling. as a result,
The occurrence of malfunction of the current cutoff mechanism due to the deformation of the inner terminal plate and the dish-shaped cover plate is extremely reduced.
【００１４】このため、電流遮断圧力の下限作動圧力を
低く設定することが可能であり、これにより、電流遮断
圧の設定範囲を広く設定することができるため、製造上
非常に作りやすい封口板が提供可能である。Therefore, it is possible to set the lower limit operating pressure of the current interruption pressure to a low value, which allows the setting range of the current interruption pressure to be set wide, so that a sealing plate that is very easy to manufacture in manufacturing is obtained. It is possible to provide.
【００１５】[0015]
【実施例】以下に、本発明の防爆封口板の実施例を、直
径１７ｍｍの円筒型リチウムイオン二次電池に組み込ん
だ場合を例にして示す。EXAMPLE An example of the explosion-proof sealing plate of the present invention will be described below by taking it as an example in which it is incorporated in a cylindrical lithium ion secondary battery having a diameter of 17 mm.
【００１６】図１は本発明の防爆封口板の構成態様の一
実施例の要部断面を示す図である。内端子板及び皿状蓋
板の厚みは封口板設計上０．３ｍｍである。内端子板、
皿状蓋板のどちらか一方、好ましくは双方に使用する金
属板材に使用した、耐力が２０ｋｇｆ／ｍｍ2以上の金
属の両面に異種の金属を配した２種の金属で構成された
クラッド板において、耐力２０ｋｇｆ／ｍｍ2以上の金
属として、ステンレスを用い、この金属の両面に配する
金属として、リチウムイオン二次電池のような高電圧の
電池においても耐食性に優れるアルミニウム及びアルミ
ニウム合金を用いた。以下、この構成のクラッド板をス
テンレス−両面アルミニウムクラッド板と称する。なお
ステンレス−両面アルミニウムクラッド板を使用する場
合、比較例のアルミニウム板単体を使用する場合におい
てもアルミニウムはＪＩＳ品番におけるＡ１１００を使
用した。また、ステンレス−両面アルミニウムクラッド
板に使用するステンレスは耐食性に非常に優れたステン
レス−ＳＵＳ４３０を使用した。さらに、ステンレス−
両面アルミニウムクラッド板において、厚み方向におけ
るステンレス材の占める割合を検討したところ、５〜９
５％が適正であることがわかった。ステンレス材の比率
を５％以下に設定しようとした場合、ステンレス−アル
ミニウムクラッド板は製造時に圧延によってステンレス
材の比率を調節するため、総厚０．３ｍｍに圧延する
際、ステンレス部の厚みが１５μｍ以下となり、圧延が
非常に困難であることがわかった。また、ステンレス材
の比率を９５％以上に設定した場合は、後述する実施例
において、アルミニウム板単体を使用した場合と強度的
に有意差がないことがわかった。他の耐力２０ｋｇｆ／
ｍｍ2の金属である鉄、チタンを用いて両面にアルミニ
ウムを配したクラッド板を構成した場合も同様な結果が
得られた。FIG. 1 is a diagram showing a cross section of a main part of an embodiment of the construction of the explosion-proof sealing plate of the present invention. The thickness of the inner terminal plate and the dish-shaped lid plate is 0.3 mm due to the design of the sealing plate. Inner terminal board,
In a clad plate composed of two kinds of metal, which is used as a metal plate material used for either one of the plate-shaped lid plates, preferably both, and which has dissimilar metals on both sides of a metal having a proof stress of 20 kgf / mm 2 or more Stainless steel was used as a metal having a proof strength of 20 kgf / mm 2 or more, and aluminum and an aluminum alloy having excellent corrosion resistance even in a high voltage battery such as a lithium ion secondary battery were used as a metal to be placed on both surfaces of this metal. Hereinafter, the clad plate having this structure is referred to as a stainless-double-sided aluminum clad plate. When using a stainless steel-double-sided aluminum clad plate, the aluminum used was JIS A1100 in the JIS part number even when the aluminum plate alone of the comparative example was used. Further, as the stainless steel used for the stainless steel-double-sided aluminum clad plate, stainless steel-SUS430 having excellent corrosion resistance was used. Furthermore, stainless steel-
In the double-sided aluminum clad plate, the proportion occupied by the stainless steel material in the thickness direction was examined.
5% was found to be adequate. When the ratio of the stainless steel material is set to 5% or less, the stainless steel-aluminum clad plate adjusts the ratio of the stainless steel material by rolling at the time of manufacturing. Therefore, when rolled to a total thickness of 0.3 mm, the thickness of the stainless steel portion is 15 μm. It became the following and it turned out that rolling is very difficult. It was also found that when the ratio of the stainless steel material was set to 95% or more, there was no significant difference in strength from the case where the aluminum plate alone was used in the examples described later. Other proof strength 20kgf /
Similar results were obtained when a clad plate in which aluminum was arranged on both sides was constructed by using iron and titanium which are mm 2 metals.
【００１７】以下に、ステンレス材の比率が５０％のス
テンレス−両面アルミニウムクラッド板を用いた場合の
実施例を示す。The following is an example of using a stainless steel-double-sided aluminum clad plate having a stainless material ratio of 50%.
【００１８】外部端子板３、ＰＴＣ素子８及び防爆弁体
１をポリプロピレン樹脂を略Ｌ字形で環状に成形した、
絶縁性のガスケット４内に積重載置すると共に、前記ガ
スケットの底部外周面に、通気孔を有する内端子板２と
防爆弁体を溶接して両者を電気的に接続（電流遮断機
構）したものを、通気孔、周縁に立ち上がり部を有する
皿状蓋板５内に載置、収容した後、前記皿状蓋板の立ち
上がり部をガスケットの立ち上がり部と共に、内方に折
曲、かしめ部６を形成して一体に締着し、本発明の防爆
封口板を構成した。The external terminal plate 3, the PTC element 8 and the explosion-proof valve body 1 are formed by molding polypropylene resin into an annular shape having a substantially L shape.
The inner terminal plate 2 having a ventilation hole and the explosion-proof valve body were welded to the outer peripheral surface of the bottom portion of the gasket in a stacked manner and electrically connected to each other (current interruption mechanism). The object is placed and housed in the dish-shaped lid plate 5 having a ventilation hole and a rising portion at the peripheral edge, and then the rising portion of the dish-shaped lid plate is bent inward together with the rising portion of the gasket, and the caulking portion 6 is provided. Was formed and fastened together to form the explosion-proof sealing plate of the present invention.
【００１９】この封口体態様において、内端子板、皿状
蓋板の双方にステンレス−両面アルミニウムクラッドを
使用した封口板を封口板−Ａ、内端子板にアルミニウム
板、皿状蓋板にステンレス−両面アルミニウムクラッド
板を使用した封口板を封口板−Ｂ、内端子板にステンレ
ス−両面アルミニウムクラッド板、皿状蓋板にアルミニ
ウム板を使用した封口板を封口板−Ｃとし、同様に、比
較として従来の態様である内端子板、皿状蓋板の双方に
アルミニウム板を用いた封口板を封口板−Ｄとする。In this embodiment of the sealing body, stainless steel is used for both the inner terminal plate and the dish-shaped lid plate--a sealing plate using a double-sided aluminum clad-A, an aluminum plate for the inner terminal plate, and a stainless steel plate for the dish-shaped lid plate. A sealing plate using a double-sided aluminum clad plate was used as a sealing plate-B, a stainless steel-double-sided aluminum clad plate was used as an inner terminal plate, and a sealing plate using an aluminum plate was used as a sealing plate-C. A sealing plate using an aluminum plate for both the inner terminal plate and the dish-shaped cover plate, which is a conventional mode, is referred to as a sealing plate -D.
【００２０】これらの封口板を製造する際の、電流遮断
機構の誤動作発生率、及びリチウムイオン二次電池に組
み込む際の誤動作発生率を確認した。（表１）に結果を
示す。The malfunction occurrence rate of the current interruption mechanism at the time of manufacturing these sealing plates and the malfunction occurrence rate at the time of incorporating into the lithium ion secondary battery were confirmed. The results are shown in (Table 1).
【００２１】[0021]
【表１】 （表１）の結果から、封口板−Ａ、Ｂ、Ｃともに従来の
封口板である封口板−Ｄに比べると封口板製造時、電池
組み込み時の双方において電流遮断機構の誤動作発生率
は極端に減少していることがわかる。封口板−Ａ、Ｂ、
Ｃの比較においては、封口板−Ａ、つまり内端子板、皿
状蓋板の双方にステンレス−両面アルミニウムクラッド
板を使用した封口板の場合が封口板製造時、及び封口板
を電池に組み込み時の双方において電流遮断機構の誤動
作発生率が低いことがわかる。また、封口板−Ｂつまり
内端子板にアルミニウム板、皿状蓋板にステンレス−両
面アルミニウムクラッド板を使用した封口板において
は、封口板製造時の電流遮断機構の誤動作発生率が封口
板−Ａに比べかなり高くなっているが、電池組み込み時
の電流遮断機構の誤動作発生率は封口板−Ａと比べると
やや高い程度である。これは、封口板製造時には、皿状
蓋板の立ち上がり部をガスケットの立ち上がり部と共
に、内方に折曲、かしめ部を形成する際、封口板内の内
端子板に最も応力がかかるため、内端子板の変形に対す
る強度が電流遮断機構の誤動作に影響するが、電池組み
込み時には封口板全体から、応力がかかるため、むしろ
皿状蓋板の強度が封口板の変形に関係するため、皿状蓋
板の強度が確保されると内端子板にアルミニウム板を使
用した場合においても極端な電流遮断機構の誤動作発生
には至らないのである。[Table 1] From the results in (Table 1), compared with the conventional sealing plate-D, which is the sealing plate-A, B, and C, the malfunction occurrence rate of the current cutoff mechanism is extremely high both when the sealing plate is manufactured and when the battery is assembled. It can be seen that it is decreasing. Seal plate-A, B,
In the comparison of C, the sealing plate-A, that is, the sealing plate using the stainless-double-sided aluminum clad plate for both the inner terminal plate and the dish-shaped lid plate is manufactured at the time of manufacturing the sealing plate and when the sealing plate is assembled into the battery. In both cases, it can be seen that the malfunction occurrence rate of the current interrupt mechanism is low. Further, in the case of the sealing plate-B, that is, the sealing plate using the aluminum plate for the inner terminal plate and the stainless steel-double-sided aluminum clad plate for the dish-shaped cover plate, the malfunction occurrence rate of the current cutoff mechanism at the time of manufacturing the sealing plate is However, the malfunction occurrence rate of the current cutoff mechanism when the battery is incorporated is slightly higher than that of the sealing plate-A. This is because when the sealing plate is manufactured, the inner terminal plate inside the sealing plate is most stressed when the rising part of the dish-shaped lid plate is bent inward and the caulking part is formed with the rising part of the gasket. The strength against the deformation of the terminal plate affects the malfunction of the current cutoff mechanism, but since the stress is applied from the entire sealing plate when the battery is installed, the strength of the plate-shaped lid plate is rather related to the deformation of the sealing plate. If the strength of the plate is secured, even if an aluminum plate is used for the inner terminal plate, the extreme malfunction of the current interruption mechanism does not occur.
【００２２】一方、封口板−Ｃつまり内端子板にステン
レス−両面アルミニウムクラッド板、皿状蓋板にアルミ
ニウム板を使用した封口板においては、封口板製造時は
封口板−Ａとほぼ同等の電流遮断機構の誤動作発生率を
示すが、電池組み立て時の誤動作発生率は封口板−Ａに
比べるとかなり高くなっている。これは封口板−Ｂで説
明したように、封口板製造時には内端子板の変形に対す
る強度があるため、電流遮断機構の誤動作は発生しにく
いが、電池組み込み時には、皿状蓋板の変形が発生し、
同時に、内端子板にも変形応力が加わり、電流遮断機構
の誤動作発生率が、封口板−Ａ、封口板−Ｂに比べる
と、高くなっている。On the other hand, the sealing plate-C, that is, the sealing plate using the stainless steel-double-sided aluminum clad plate for the inner terminal plate and the aluminum plate for the dish-shaped lid plate, has a current substantially equal to that of the sealing plate-A at the time of manufacturing the sealing plate. The malfunction rate of the shutoff mechanism is shown, but the malfunction rate at the time of battery assembly is considerably higher than that of the sealing plate-A. As described in the sealing plate-B, this has strength against deformation of the inner terminal plate during manufacturing of the sealing plate, and thus malfunction of the current cutoff mechanism is unlikely to occur, but deformation of the dish-shaped lid plate occurs when the battery is installed. Then
At the same time, a deformation stress is also applied to the inner terminal plate, and the malfunction occurrence rate of the current interrupting mechanism is higher than that of the sealing plate-A and the sealing plate-B.
【００２３】他の耐力２０ｋｇｆ／ｍｍ2の金属である
鉄、チタンを用いた両面アルミニウムクラッド板を使用
した場合も同様な結果が得られた。また、耐力が２０ｋ
ｇｆ／ｍｍ2以上の金属の両面に配する金属としてアル
ミニウム合金を使用した場合も同様な結果が得られた。Similar results were obtained when a double-sided aluminum clad plate using another metal having a proof strength of 20 kgf / mm 2 such as iron or titanium was used. Also, the proof stress is 20k.
Similar results were obtained when an aluminum alloy was used as a metal to be placed on both sides of a metal having a gf / mm 2 or more.
【００２４】一方、クラッド板の作成において、耐力２
０ｋｇｆ／ｍｍ2以上の金属の両面にアルミニウムもし
くはアルミニウム合金を配した理由は以下の内容によ
る。On the other hand, in the production of the clad plate, the yield strength is 2
The reason why aluminum or aluminum alloy is placed on both sides of a metal of 0 kgf / mm 2 or more is as follows.
【００２５】耐力２０ｋｇｆ／ｍｍ2以上の金属の片面
にアルミニウムもしくはアルミニウム合金を配したクラ
ッド板を使用した場合、本発明の防爆封口板態様におい
ては、内端子板及び皿状蓋板は直接電解液と接触するた
め、リチウムイオン二次電池のような高電圧の電池にお
いては、アルミニウム、アルミニウム合金以外の金属で
は、電解腐食が起こる。また、本発明の封口板態様で
は、内端子板と皿状蓋板は金属面の接触で導通を確保し
ており、かしめの圧縮力で接触抵抗を低減している。こ
のような構造のため、電解液に接触し正極電位を示す部
分にステンレス層がある場合は、ステンレスの電解腐食
により、金属面間の接触抵抗の増大、もしくは、ステン
レスが徐々に溶解した結果、かしめの圧縮力が緩和され
るために接触抵抗が増大するなどの問題点があることが
わかった。したがって、耐力２０ｋｇｆ／ｍｍ2以上の
金属の両面にアルミニウムもしくはアルミニウム合金を
配したクラッド板を使用しなければならない。When a clad plate in which aluminum or aluminum alloy is arranged on one surface of a metal having a proof strength of 20 kgf / mm 2 or more is used, in the explosion-proof sealing plate mode of the present invention, the inner terminal plate and the dish-shaped cover plate are directly electrolytic solution. Therefore, in a high-voltage battery such as a lithium-ion secondary battery, electrolytic corrosion occurs in metals other than aluminum and aluminum alloys. Further, in the sealing plate aspect of the present invention, the inner terminal plate and the dish-shaped cover plate ensure the conduction by the contact of the metal surfaces, and the contact resistance is reduced by the compression force of the caulking. Due to such a structure, when there is a stainless steel layer in a portion which is in contact with an electrolytic solution and exhibits a positive electrode potential, electrolytic corrosion of stainless steel increases contact resistance between metal surfaces, or as a result of gradual dissolution of stainless steel, It was found that there is a problem that the contact resistance increases because the compression force of caulking is relaxed. Therefore, it is necessary to use a clad plate in which aluminum or aluminum alloy is arranged on both surfaces of a metal having a proof stress of 20 kgf / mm 2 or more.
【００２６】以上の結果より、封口板内の内端子板、皿
状蓋板のどちらか一方、好ましくは双方に使用する金属
板材に、耐力が２０ｋｇｆ／ｍｍ2以上の金属の両面に
異種の金属を配した２種の金属で構成されたクラッド板
を使用することによって、封口板製造時、封口板を電池
に組み込む場合において、封口板内に設けられた電流遮
断機構の誤動作を極端に減少することができる。From the above results, a metal plate material used for either one of the inner terminal plate and the dish-shaped cover plate in the sealing plate, preferably for both, is a metal having a proof stress of 20 kgf / mm 2 or more. By using the clad plate composed of two kinds of metal with the above-mentioned arrangement, the malfunction of the current interruption mechanism provided in the sealing plate is extremely reduced when the sealing plate is assembled into the battery at the time of manufacturing the sealing plate. be able to.
【００２７】[0027]
【発明の効果】本発明の密閉型電池用防爆封口板を用い
ることによって、封口板製造及び封口板を電池に組み込
む際に受ける応力による内端子板、皿状蓋板の変形を抑
制でき、電流遮断圧の下限作動圧を低く設定することが
可能となり、その結果、電流遮断圧の設定範囲を広くす
ることによって、製造上作製し易く安全性に優れた封口
板の提供が可能となった。EFFECTS OF THE INVENTION By using the explosion-proof sealing plate for a sealed battery of the present invention, it is possible to suppress the deformation of the inner terminal plate and the dish-shaped cover plate due to the stress applied when manufacturing the sealing plate and assembling the sealing plate into the battery, and reducing the current. It has become possible to set the lower limit operating pressure of the breaking pressure low, and as a result, it has become possible to provide a sealing plate that is easy to manufacture in manufacturing and excellent in safety by widening the setting range of the current breaking pressure.
【図１】（Ａ） 本発明の一実施例の密閉型電池用防爆
封口板の断面図 （Ｂ） Ａ部拡大図 （Ｃ） Ｂ部拡大図FIG. 1A is a cross-sectional view of an explosion-proof sealing plate for a sealed battery according to an embodiment of the present invention. FIG. 1B is an enlarged view of part A. FIG.
１ 防爆弁体 ２ 内端子板（ステンレス−両面アルミニウムクラッド
板） ３ 外部端子板 ４ ガスケット ５ 皿状蓋板（ステンレス−両面アルミニウムクラッド
板） ６ かしめ部 ７ 溶接部 ８ ＰＴＣ素子1 Explosion-proof valve body 2 Inner terminal board (stainless steel-both sides aluminum clad board) 3 External terminal board 4 Gasket 5 Plate-shaped lid board (stainless steel-both sides aluminum clad board) 6 Crimping part 7 Welding part 8 PTC element
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大尾 文夫 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Fumio Oo 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.
Claims (3)
板群と、電解液を収容した電池ケースを密閉する封口板
であり、この封口板は金属製キャップ状外部端子板、金
属箔製弁体、この弁体に一部が溶接され電気的に接続さ
れた金属製で通気孔を有する内端子板、通気孔及び周縁
に立ち上がり部を有し、前記外部端子板、弁体、内端子
板を収容する金属製の皿状蓋板を備えており、前記内端
子板、皿状蓋板のどちらか一方、または双方に耐力が２
０ｋｇｆ／ｍｍ2以上の金属の両面に異種の金属を配し
たクラッド板を使用した密閉型電池用防爆封口板。1. An electrode plate group consisting of a positive electrode plate, a negative electrode plate and a separator, and a sealing plate for sealing a battery case containing an electrolytic solution. The sealing plate is a metal cap-shaped external terminal plate, a metal foil valve. Body, an inner terminal plate made of metal, which is partially welded to the valve body and electrically connected to the valve body, having a vent hole, a vent hole and a rising portion at the periphery, and the external terminal plate, valve body, inner terminal plate Is provided with a metal dish-shaped lid plate, and either one of the inner terminal plate and the dish-shaped lid plate, or both have a proof stress of 2 or less.
Explosion-proof sealing plate for sealed batteries that uses a clad plate in which different kinds of metals are arranged on both sides of a metal of 0 kgf / mm 2 or more.
しくは双方に使用する金属板材に、耐力が２０ｋｇｆ／
ｍｍ2以上の金属の両面に異種の金属を配したクラッド
板において、耐力が２０ｋｇｆ／ｍｍ2以上の金属が
鉄、ステンレス、チタニウムである請求項１記載の密閉
型電池用防爆封口板。2. A metal plate material used for either one of the inner terminal plate and the dish-shaped lid plate, preferably for both, and has a proof stress of 20 kgf /
In mm 2 or more clad plates arranged dissimilar metals to both sides of the metal yield strength is 20 kgf / mm 2 or more metals iron, stainless steel, sealed battery explosion爆封port plate of claim 1 wherein the titanium.
しくは双方に使用する金属板材に、耐力が２０ｋｇｆ／
ｍｍ2以上の金属の両面に異種の金属を配したクラッド
板において、耐力が２０ｋｇｆ／ｍｍ2以上の金属の両
面に配する金属がアルミニウム及びアルミニウム合金で
ある請求項１記載の密閉型電池用防爆封口板。3. A metal plate material used for either one of the inner terminal plate and the dish-shaped lid plate, preferably both, having a proof stress of 20 kgf /
The explosion-proof for a sealed battery according to claim 1, wherein in the clad plate in which different kinds of metals are arranged on both sides of a metal of mm 2 or more, the metals arranged on both sides of a metal having a proof stress of 20 kgf / mm 2 or more are aluminum and aluminum alloy. Seal plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8007062A JPH09199104A (en) | 1996-01-19 | 1996-01-19 | Explosion-proof sealing plate for sealed battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8007062A JPH09199104A (en) | 1996-01-19 | 1996-01-19 | Explosion-proof sealing plate for sealed battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09199104A true JPH09199104A (en) | 1997-07-31 |
Family
ID=11655591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8007062A Pending JPH09199104A (en) | 1996-01-19 | 1996-01-19 | Explosion-proof sealing plate for sealed battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09199104A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1021892A (en) * | 1996-06-28 | 1998-01-23 | Matsushita Electric Ind Co Ltd | Explosion-proof sealing plate for sealed battery and its manufacture |
| JP2008282679A (en) * | 2007-05-10 | 2008-11-20 | Sanyo Electric Co Ltd | Sealed battery |
| CN115020880A (en) * | 2022-06-23 | 2022-09-06 | 江苏正力新能电池技术有限公司 | Battery top cap and battery |
-
1996
- 1996-01-19 JP JP8007062A patent/JPH09199104A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1021892A (en) * | 1996-06-28 | 1998-01-23 | Matsushita Electric Ind Co Ltd | Explosion-proof sealing plate for sealed battery and its manufacture |
| JP2008282679A (en) * | 2007-05-10 | 2008-11-20 | Sanyo Electric Co Ltd | Sealed battery |
| CN115020880A (en) * | 2022-06-23 | 2022-09-06 | 江苏正力新能电池技术有限公司 | Battery top cap and battery |
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