JP3346675B2 - Explosion-proof sealing plate for sealed batteries - Google Patents
Explosion-proof sealing plate for sealed batteriesInfo
- Publication number
- JP3346675B2 JP3346675B2 JP10850495A JP10850495A JP3346675B2 JP 3346675 B2 JP3346675 B2 JP 3346675B2 JP 10850495 A JP10850495 A JP 10850495A JP 10850495 A JP10850495 A JP 10850495A JP 3346675 B2 JP3346675 B2 JP 3346675B2
- Authority
- JP
- Japan
- Prior art keywords
- explosion
- pressure
- sealing plate
- proof sealing
- metal foil
- 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.)
- Expired - Fee Related
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
- Gas Exhaust Devices For Batteries (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電流遮断およびガス排
出機構を具備する密閉型電池の防爆封口板に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an explosion-proof sealing plate for a sealed battery having a current interrupting and gas discharging mechanism.
【０００２】[0002]
【従来の技術】従来より、密閉型電池では、化学反応等
にともなって発生するガスによる内部圧力上昇や過充電
による発火、爆発の危険性に対する防爆機構として、種
々の防爆封口板が用いられている。例えば、特開平６−
１９６１５０号公報は、超音波溶接により電気的に導通
させた溶接板と隔壁からなる防爆機構を開示している。
この防爆機構では、内側、すなわち発電要素側に通気孔
を有する溶接板が配され、その外側に電池を密封する隔
壁が配置されている。電池内部の圧力が上昇すると、外
側に配された隔壁が膨らみ、内側の溶接板を引っ張る力
が生じる。電池内部の圧力がさらに上昇し、この力が隔
壁と溶接板の間の溶接部分の強度を上回ると、隔壁と溶
接板は剥離する。そのため、両者は電気的に絶縁され、
電流が遮断される。2. Description of the Related Art Conventionally, in a sealed battery, various explosion-proof sealing plates have been used as an explosion-proof mechanism against an internal pressure rise due to a gas generated due to a chemical reaction or the like, and ignition or explosion due to overcharge. I have. For example, Japanese Unexamined Patent Publication
Japanese Patent Publication No. 196150 discloses an explosion-proof mechanism including a welding plate and a partition electrically connected by ultrasonic welding.
In this explosion-proof mechanism, a welding plate having a vent hole is arranged inside, that is, on the power generation element side, and a partition wall that seals the battery is arranged outside the welding plate. When the pressure inside the battery rises, the partition arranged outside swells, and a force is generated to pull the inside weld plate. If the pressure inside the battery further increases and this force exceeds the strength of the weld between the partition and the weld plate, the partition and the weld plate will separate. Therefore, both are electrically insulated,
The current is interrupted.
【０００３】[0003]
【発明が解決しようとする課題】上記のような電流遮断
方式の防爆機構では、電池の内部圧力が上昇した際に電
流を遮断する圧力は、溶接部の強度に依存する。この溶
接部の強度は精密な制御が困難であるから、このような
電流遮断方式の防爆封口板の作動圧は安定しない。本発
明は、電池内圧力が上昇した場合に精度よく電流を遮断
し、発火等の事故を防止することのできる、品質の一定
した防爆封口板を提供することを目的とする。In the current-blocking type explosion-proof mechanism as described above, the pressure at which the current is cut off when the internal pressure of the battery rises depends on the strength of the welded portion. Since it is difficult to precisely control the strength of the welded portion, the operating pressure of such a current cutoff type explosion-proof sealing plate is not stable. An object of the present invention is to provide a high-quality explosion-proof sealing plate that can accurately cut off current when the internal pressure of a battery rises and prevent accidents such as ignition.
【０００４】[0004]
【課題を解決するための手段】本発明の密閉型電池の防
爆封口板は、中央部を部分的に接合して電気的に接続さ
れた内外２枚の金属箔を含み、内外の金属箔が、球面状
の張り出し部を有した形状で、前記接合部を取り囲むよ
うに配置され、かつ前記接合部の剥離する圧力よりも低
い圧力で破断する薄肉部を前記張り出し部に有し、外側
の金属箔が、前記内側金属箔の薄肉部の破断する圧力よ
りも高い圧力で破断する薄肉部を有するものである。The explosion-proof sealing plate of the sealed battery according to the present invention includes two inner and outer metal foils which are electrically connected by partially joining a central portion. , Spherical
In the shape having an overhang portion , arranged to surround the joint portion, and has a thin portion in the overhang portion that breaks at a pressure lower than the peeling pressure of the joint portion, the outer metal foil, The inner metal foil has a thin portion that breaks at a pressure higher than the pressure at which the thin portion breaks.
【０００５】[0005]
【作用】本発明の密閉型電池の防爆封口板は、電池内圧
力が上昇すると、まず、内側の金属箔が膨らみ、この圧
力が内側の金属箔を破断する圧力に達すると、その薄肉
部に破れが生じる。外側の金属箔は膨らみ、接合した内
側の金属箔を引っ張る。２枚の金属箔の接合部の剥離す
る圧力は内側の金属箔の薄肉部の薄肉部の破断する圧力
よりも高いため、内側の金属箔の薄肉部の破れは進行
し、２枚の金属箔が分離することにより、電流が遮断さ
れる。圧力がさらに上昇し、外側の金属箔の破断する圧
力に達すると、外側の金属箔が破断し、電池内部のガス
を外部に放出し、電池内部の圧力が低下する。従って、
電流遮断圧は、金属箔の接合部の強度に依存しない。ま
た、薄肉部を形成することによる破断する圧力を容易に
制御でき、電流遮断圧の一定した防爆封口板を提供する
ことができる。According to the explosion-proof sealing plate of the sealed battery of the present invention, when the pressure inside the battery rises, the inner metal foil first expands, and when this pressure reaches the pressure at which the inner metal foil is broken, the explosion-proof sealing plate becomes thinner. Tears occur. The outer metal foil swells and pulls the bonded inner metal foil. Since the pressure at which the joint between the two metal foils is separated is higher than the pressure at which the thin portion of the inner metal foil breaks, the tearing of the thin portion of the inner metal foil progresses, and the two metal foils are broken. Are separated, thereby interrupting the current. When the pressure further rises and reaches the pressure at which the outer metal foil breaks, the outer metal foil breaks, releasing gas inside the battery to the outside and lowering the pressure inside the battery. Therefore,
The current cutoff pressure does not depend on the strength of the metal foil joint. In addition, the pressure at which the thin portion is broken can be easily controlled, and an explosion-proof sealing plate having a constant current interruption pressure can be provided.
【０００６】[0006]
【実施例】以下、本発明をその実施例により詳しく説明
する。本発明の防爆封口板の一実施例を図１に示す。厚
さ０．１５ｍｍ、外径φ１２．７ｍｍのアルミニウム箔
１の中央部に外径φ４．０ｍｍの円形刻印を用いて環状
の薄肉部１ａを設けた。一方、厚さ０．１２ｍｍ、外径
φ１２．７ｍｍのアルミニウム箔７の中央部に外径φ
４．０ｍｍの円形の刻印による環状の薄肉部７ａを設け
た。これら２枚のアルミニウム箔１および７の周縁部間
に絶縁ガスケット３を挟み込んだ後、２枚のアルミニウ
ム箔１および７の中央部を超音波溶接し、これらを通気
孔を持つアルミニウムケース４の中に挿入し、その上部
に温度抵抗体５および通気孔を持つ金属キャップ６をの
せ、ケース４の上端部を、絶縁ガスケット３を介して金
属キャップ６の周縁部にかしめて防爆封口板を得た。こ
の防爆封口板は、下部を内側にして発電要素を収納した
電池ケースの開口部に装着して使用される。そして、こ
のケース４には正極のリードが接続される。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. One embodiment of the explosion-proof sealing plate of the present invention is shown in FIG. An annular thin portion 1a was provided in the center of an aluminum foil 1 having a thickness of 0.15 mm and an outer diameter of 12.7 mm using a circular stamp having an outer diameter of 4.0 mm. On the other hand, the outer diameter φ is set at the center of the aluminum foil 7 having a thickness of 0.12 mm and an outer diameter of 12.7 mm.
An annular thin portion 7a with a 4.0 mm circular stamp was provided. After sandwiching the insulating gasket 3 between the peripheral edges of these two aluminum foils 1 and 7, the central portions of the two aluminum foils 1 and 7 are ultrasonically welded, and these are welded in an aluminum case 4 having vent holes. And a metal cap 6 having a temperature resistor 5 and a ventilation hole is placed on the upper part thereof, and the upper end of the case 4 is caulked to the peripheral edge of the metal cap 6 via the insulating gasket 3 to obtain an explosion-proof sealing plate. . This explosion-proof sealing plate is used by being attached to an opening of a battery case in which a power generation element is housed, with the lower part being on the inside. Then, a positive electrode lead is connected to the case 4.
【０００７】このケース４は、アルミニウム箔７と前記
の溶接部１１で電気的に接続されている。また、金属キ
ャップ６は、温度抵抗体５を介してアルミニウム箔１と
電気的に接続されている。すなわち、ケース４と金属キ
ャップ６は、２枚のアルミニウム箔１および７の溶接部
１１を介して電気的接続状態にある。ここで、薄肉部７
ａは、溶接部１１の剥離する圧力および薄肉部１ａの破
断する圧力以下の圧力で破断するように設計されてい
る。[0007] The case 4 is electrically connected to the aluminum foil 7 at the above-mentioned welded portion 11. Further, the metal cap 6 is electrically connected to the aluminum foil 1 via the temperature resistor 5. That is, the case 4 and the metal cap 6 are in an electrically connected state via the welded portion 11 of the two aluminum foils 1 and 7. Here, the thin portion 7
a is designed to break at a pressure equal to or less than the pressure at which the welding portion 11 peels and the pressure at which the thin portion 1a breaks.
【０００８】次に、この密閉型電池の防爆封口板の作動
メカニズムを説明する。電池内圧力が上昇すると、ま
ず、内側のアルミニウム箔７が膨らみ、その薄肉部７ａ
に破れが生じる。次に、その外側に配されたアルミニウ
ム箔１が膨らみ、接合した内側のアルミニウム箔７を引
っ張るため、その薄肉部７ａの破れは進行し、破断に至
る。こうして２枚のアルミニウム箔が分離されることに
より、電流が遮断される。その後、さらに電池内圧力が
上昇すると、外側のアルミニウム箔１の薄肉部１ａが破
断することによって、電池内部で発生したガスを電池外
部に放出し、電池内圧力を低下させる。Next, an operation mechanism of the explosion-proof sealing plate of the sealed battery will be described. When the pressure in the battery rises, first, the inner aluminum foil 7 swells and its thin portion 7a
Tears. Next, since the aluminum foil 1 arranged on the outside expands and pulls the joined aluminum foil 7 on the inside, the thin portion 7a is torn and breaks. By separating the two aluminum foils in this manner, the current is interrupted. Thereafter, when the internal pressure of the battery further rises, the thin portion 1a of the outer aluminum foil 1 breaks, thereby discharging the gas generated inside the battery to the outside of the battery and lowering the internal pressure of the battery.
【０００９】次に、比較例である、従来の防爆封口板に
ついて説明する。この比較例の防爆封口板の断面図を図
２に示す。実施例と同様の厚さ０．１５mm、外径φ１
２．７mmのアルミニウム箔１３の中央部に外径φ４．０
mmの円形刻印を用いて環状の薄肉部１３ａを設けた。さ
らに、厚さ０．３mm、外径φ１２．７mmの通気孔を持つ
アルミニウム箔２の中央部に外径φ１．０mmの突起部２
ａを設けた。この２枚のアルミニウム箔１３および２の
周縁部間に絶縁ガスケット３を挟み込んだ後、アルミニ
ウム箔１３の中央部とアルミニウム箔２の突起部２ａを
超音波溶接し、これらを通気孔を持つアルミニウムケー
ス４の中に挿入し、その上部に温度抵抗体５および、通
気孔を持つキャップ６をのせ、ケース４の上端部を、絶
縁ガスケット３を介して金属キャップ６の周縁部にかし
めて防爆封口板を得た。実施例と同様に、ケース４とキ
ャップ６は、２枚のアルミニウム箔１３および２を介し
て電気的に接続されている。Next, a conventional explosion-proof sealing plate, which is a comparative example, will be described. FIG. 2 shows a sectional view of the explosion-proof sealing plate of this comparative example. The same thickness as in the example, 0.15 mm, outer diameter φ1
An outer diameter of φ4.0 is provided at the center of a 2.7 mm aluminum foil 13.
An annular thin portion 13a was provided using a circular engraving of mm. Further, a protrusion 2 having an outer diameter of 1.0 mm is provided at the center of an aluminum foil 2 having a ventilation hole having a thickness of 0.3 mm and an outer diameter of 12.7 mm.
a was provided. After sandwiching the insulating gasket 3 between the peripheral portions of the two aluminum foils 13 and 2, the center portion of the aluminum foil 13 and the projection 2a of the aluminum foil 2 are ultrasonically welded to form an aluminum case having a vent hole. 4, a temperature resistor 5 and a cap 6 having a ventilation hole are placed on the upper part thereof, and the upper end of the case 4 is crimped to the peripheral edge of the metal cap 6 via the insulating gasket 3 to explode the sealing plate. I got As in the embodiment, the case 4 and the cap 6 are electrically connected via two aluminum foils 13 and 2.
【００１０】実施例および比較例の防爆封口板を、図３
に示す装置を用いて、以下の方法で評価した。電極８ａ
と８ｂの間に防爆封口板１２の周縁部を気密に挟み込む
とともに、両電極間に電圧を印加することにより、ケー
ス４とキャップ６を介して２枚のアルミニウム箔の間に
通電させる。そして、ケース４の下方の高圧空気導入口
１０より高圧空気を送り、防爆封口板下部を毎秒０．６
ｋｇｆ／ｃｍ2で昇圧しながら加圧する。このときの２
枚のアルミニウム箔の間で電流が遮断される空気圧を、
圧力センサー９を用いて測定した。それぞれの結果を表
１に示す。The explosion-proof sealing plates of the examples and comparative examples are shown in FIG.
Was evaluated by the following method using the apparatus shown in Table 1. Electrode 8a
And 8b, the peripheral portion of the explosion-proof sealing plate 12 is hermetically sandwiched, and a voltage is applied between the two electrodes, so that a current flows between the two aluminum foils via the case 4 and the cap 6. Then, high-pressure air is sent from the high-pressure air inlet 10 below the case 4, and the lower part of the explosion-proof sealing plate is set at 0.6 per second.
Pressurize while increasing the pressure at kgf / cm 2 . 2 at this time
The air pressure at which the current is interrupted between the pieces of aluminum foil,
It measured using the pressure sensor 9. Table 1 shows the results.
【００１１】[0011]
【表１】 [Table 1]
【００１２】表１から明らかなように、実施例の防爆封
口板は、電流を遮断する圧力のバラツキ（σ(n-1)）が
大きく改善されていることがわかる。比較例である従来
の防爆封口板は、２枚のアルミニウム箔２および１３が
溶接部である突起部２ａで剥離することにより電流を遮
断するため、電流遮断圧は溶接部の強度に依存する。そ
のため、溶接部の強度のバラツキが、電流遮断圧に大き
く影響する。それに対して、実施例の防爆封口板は、薄
肉部７ａの破断により電流が遮断される。アルミニウム
箔の薄肉部の破断する圧力は、刻印等により容易に、か
つ精度良く制御可能である。そのため、本発明の密閉型
電池の防爆封口板は、バラツキが小さく、一定した圧力
で電流を遮断させることができる。As is clear from Table 1, the explosion-proof sealing plate of the embodiment has a significantly improved variation (σ (n-1)) in the pressure for interrupting the current. In the conventional explosion-proof sealing plate of the comparative example, the current is interrupted by the two aluminum foils 2 and 13 being peeled off by the projection 2a, which is a welded portion. Therefore, the variation in the strength of the welded portion greatly affects the current interruption pressure. On the other hand, in the explosion-proof sealing plate of the embodiment, the current is interrupted by the breakage of the thin portion 7a. The pressure at which the thin portion of the aluminum foil breaks can be easily and accurately controlled by stamping or the like. Therefore, the explosion-proof sealing plate of the sealed battery of the present invention has a small variation and can cut off the current at a constant pressure.
【００１３】[0013]
【発明の効果】以上のように、本発明によると、電池内
圧力が上昇したときに一定した圧力で電流を遮断し、発
火等の事故をより確実に防止する密閉型電池の防爆封口
板を提供することができる。As described above, according to the present invention, the explosion-proof sealing plate of a sealed battery that shuts off the current at a constant pressure when the pressure inside the battery rises and more reliably prevents accidents such as ignition. Can be provided.
【図１】本発明の実施例の防爆封口板の縦断面図であ
る。FIG. 1 is a longitudinal sectional view of an explosion-proof sealing plate according to an embodiment of the present invention.
【図２】比較例の防爆封口板の縦断面図である。FIG. 2 is a longitudinal sectional view of an explosion-proof sealing plate of a comparative example.
【図３】防爆封口板の電流遮断性能を評価する装置の縦
断面図である。FIG. 3 is a longitudinal sectional view of an apparatus for evaluating the current interruption performance of an explosion-proof sealing plate.
１ アルミニウム箔 １ａ 薄肉部 ２ アルミニウム箔 ２ａ 突起部 ３ 絶縁ガスケット ４ アルミニウムケース ５ 温度抵抗体 ６ 金属キャップ ７ アルミニウム箔 ７ａ 薄肉部 ８ａ 電極 ８ｂ 電極 ９ 圧力センサー １０ 高圧空気導入口 １１ 溶接部 １２ 防爆封口板 １３ アルミニウム箔 １３ａ 薄肉部 DESCRIPTION OF SYMBOLS 1 Aluminum foil 1a Thin part 2 Aluminum foil 2a Projection part 3 Insulating gasket 4 Aluminum case 5 Temperature resistor 6 Metal cap 7 Aluminum foil 7a Thin part 8a Electrode 8b Electrode 9 Pressure sensor 10 High pressure air inlet 11 Welded part 12 Explosion-proof sealing plate 13 Aluminum foil 13a Thin part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 平川 靖 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (56)参考文献 特開 平６−203818（ＪＰ，Ａ) 特開 平７−105933（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01M 2/12 101 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Hirakawa 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-6-203818 (JP, A) JP-A-7- 105933 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) H01M 2/12 101
Claims (1)
された内外２枚の金属箔を含み、内側の金属箔が、球面
状の張り出し部を有した形状で、前記接合部を取り囲む
ように配置され、かつ前記接合部の剥離する圧力よりも
低い圧力で破断する薄肉部を前記張り出し部に有し、外
側の金属箔が前記内側金属箔の薄肉部の破断する圧力よ
りも高い圧力で破断する薄肉部を有する密閉型電池の防
爆封口板。An inner metal foil includes an inner metal foil and an inner metal foil which are electrically connected to each other by partially joining a central portion thereof, wherein the inner metal foil has a spherical surface.
In the shape having a protruding portion in the shape, it is arranged so as to surround the bonding portion, and has a thin portion in the protruding portion that breaks at a pressure lower than the pressure at which the bonding portion peels , and the outer metal foil is An explosion-proof sealing plate for a sealed battery having a thin portion that breaks at a pressure higher than a pressure at which the thin portion of the inner metal foil breaks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10850495A JP3346675B2 (en) | 1995-05-02 | 1995-05-02 | Explosion-proof sealing plate for sealed batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10850495A JP3346675B2 (en) | 1995-05-02 | 1995-05-02 | Explosion-proof sealing plate for sealed batteries |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08306351A JPH08306351A (en) | 1996-11-22 |
| JP3346675B2 true JP3346675B2 (en) | 2002-11-18 |
Family
ID=14486461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10850495A Expired - Fee Related JP3346675B2 (en) | 1995-05-02 | 1995-05-02 | Explosion-proof sealing plate for sealed batteries |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3346675B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3254995B2 (en) * | 1995-12-19 | 2002-02-12 | 松下電器産業株式会社 | Explosion-proof sealing plate for thin batteries |
| US5958617A (en) * | 1996-12-11 | 1999-09-28 | Matsushita Electric Industrial Co., Ltd. | Thin type battery |
| JPH10302744A (en) * | 1997-04-28 | 1998-11-13 | Matsushita Electric Ind Co Ltd | Explosion-proof sealing plate for sealed battery |
| JPH11144705A (en) * | 1997-11-11 | 1999-05-28 | Matsushita Electric Ind Co Ltd | Explosion-proof non aqueous electrolyte secondary battery and its breaking pressure setting method |
| KR100381328B1 (en) * | 1999-12-28 | 2003-04-23 | 주식회사 엘지화학 | Li-ION BATTERY USING SIMPLIFIED SAFETY VENT |
| JP5011664B2 (en) * | 2005-07-11 | 2012-08-29 | パナソニック株式会社 | Sealed secondary battery |
| JP6801645B2 (en) | 2015-03-27 | 2020-12-16 | 三洋電機株式会社 | Cylindrical battery |
| WO2017164000A1 (en) | 2016-03-25 | 2017-09-28 | 三洋電機株式会社 | Cylindrical battery |
| US11145942B2 (en) | 2016-03-25 | 2021-10-12 | Sanyo Electric Co., Ltd. | Cylindrical battery |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06203818A (en) * | 1992-12-26 | 1994-07-22 | Hitachi Maxell Ltd | Explosion-proof sealed battery |
| JPH07105933A (en) * | 1993-10-06 | 1995-04-21 | Hitachi Maxell Ltd | Anti-explosive enclosed battery |
-
1995
- 1995-05-02 JP JP10850495A patent/JP3346675B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08306351A (en) | 1996-11-22 |
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