JP2002063886A - Safety valve for sealed battery - Google Patents
Safety valve for sealed batteryInfo
- Publication number
- JP2002063886A JP2002063886A JP2001153499A JP2001153499A JP2002063886A JP 2002063886 A JP2002063886 A JP 2002063886A JP 2001153499 A JP2001153499 A JP 2001153499A JP 2001153499 A JP2001153499 A JP 2001153499A JP 2002063886 A JP2002063886 A JP 2002063886A
- Authority
- JP
- Japan
- Prior art keywords
- safety valve
- sealed battery
- metal foil
- metal
- metal plates
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は密閉型電池に関し、
更に詳しくは、リチウム一次電池や非水電解液一次電池
などの密閉型電池に関し、特にかかる密閉型電池に採用
される内圧の異常な上昇を外部に逃す安全弁に関するも
のである。更に具体的には、短絡時、過放電時、火中投
入時など内部温度上昇や内部圧力上昇した際の電池安全
性を確保する密閉型電池の安全弁に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed battery,
More specifically, the present invention relates to a sealed battery such as a lithium primary battery and a non-aqueous electrolyte primary battery, and more particularly to a safety valve employed in such a sealed battery that escapes an abnormal increase in internal pressure to the outside. More specifically, the present invention relates to a safety valve for a sealed battery that ensures battery safety when an internal temperature rises or an internal pressure rises, for example, during a short circuit, overdischarge, or when thrown into a fire.
【０００２】[0002]
【従来の技術】密閉型電池の１例であるリチウム一次電
池の縦断面を示す図５において、シート状の正極１及び
負極２をフィルム上のセパレータ３を挟んで重ね合わせ
ると共に、これらを渦巻き状に巻回することによって形
成されたスパイラル電極４を有する。更に、このスパイ
ラル電極４が収納される負極端子を兼ねた有底筒状の外
装缶５と、この外装缶５の開口部に絶縁ガスケット６を
介して取り付けられ、この開口部を封止する封口体８と
を有し、上記ガスケット６には、正極端子７、パッキン
グ１１及び集電リング９が配置されている。そして、前
記外装缶５内には、その開口部の封口に先だって、非水
電解液が注入されている。2. Description of the Related Art FIG. 5 shows a longitudinal section of a lithium primary battery which is an example of a sealed battery. As shown in FIG. Has a spiral electrode 4 formed by being wound around. Further, a bottomed cylindrical outer can 5 also serving as a negative electrode terminal in which the spiral electrode 4 is housed, and a sealing member attached to an opening of the outer can 5 via an insulating gasket 6 to seal the opening The gasket 6 includes a positive electrode terminal 7, a packing 11, and a current collecting ring 9. A non-aqueous electrolyte is injected into the outer can 5 before closing the opening.
【０００３】ところで、このようなリチウム一次電池な
どの密閉型電池においては、短絡時、過放電などが起こ
った場合、電池内部の温度や圧力が異常に上昇してしま
うことが想定される。Incidentally, in a sealed battery such as a lithium primary battery, when short-circuiting or over-discharging occurs, it is assumed that the temperature and pressure inside the battery rise abnormally.
【０００４】そこで、従来では、リチウム一次電池に異
常な電流が流れたときに電流を遮断するＰＴＣ素子など
を設置するなどして、前記の不具合の発生を防止するこ
とが行われている。本発明が関連する、正極端子の内側
にガス排出孔１６と連通させた空間に安全弁機構１０を
設けた構成もその一つである。Therefore, conventionally, the occurrence of the above-mentioned problem has been prevented by installing a PTC element or the like for interrupting the current when an abnormal current flows in the lithium primary battery. One of the configurations related to the present invention is that a safety valve mechanism 10 is provided in a space that communicates with a gas discharge hole 16 inside a positive electrode terminal.
【０００５】上記安全弁機構１０としては、例えば、添
付の図５と図６に示すように、リチウム電池のような密
閉型電池は、異常に内圧が上昇したとき、内圧を電池の
外部に開放するように安全弁機構１０が内蔵されてい
る。As the safety valve mechanism 10, for example, as shown in FIGS. 5 and 6, a sealed battery such as a lithium battery releases the internal pressure to the outside of the battery when the internal pressure rises abnormally. As described above, the safety valve mechanism 10 is incorporated.
【０００６】その安全弁機構１０は、正極７の端子部７
ａに切刃７ｂを設け、且つ、その下部にアルミラミネー
ト１５を設置したものが多用されており、この構造で
は、内圧が上昇したときアルミラミネート１５が矢印
（図６）のように上方に膨らみ、その膨らみが上記端子
の切刃７ｂに達し、それによってアルミラミネート１５
が破断して内圧が電池外部に開放される仕組みとなって
いる。ここで、上記アルミラミネート１５は、およそ３
０ミクロン厚のアルミニウムシートの上下両面にそれぞ
れ６０ミクロン程度の厚みのポリプロピレンシートを被
覆した三層構造ものが一般的となっている。The safety valve mechanism 10 includes a terminal 7 of the positive electrode 7.
a is provided with a cutting edge 7b and an aluminum laminate 15 provided below the cutting edge 7b. In this structure, when the internal pressure increases, the aluminum laminate 15 bulges upward as shown by an arrow (FIG. 6). The bulge reaches the cutting edge 7b of the terminal, and thereby the aluminum laminate 15
Is broken and the internal pressure is released to the outside of the battery. Here, the above aluminum laminate 15 is approximately 3
Generally, a three-layer structure in which a polypropylene sheet having a thickness of about 60 μm is coated on both upper and lower surfaces of an aluminum sheet having a thickness of 0 μm.
【０００７】ところが、安全弁機構１０に上記のような
アルミラミネート１５を用いると、電池が誤使用された
場合、或いは使用環境温度が高温である場合などの高温
環境下では、その安全弁破断圧力は常温でのそれと比較
すると著しく低下する傾向にある。それは、内圧が上昇
するとラミネート１５が膨らむが、その膨らみ方が温度
によって異なり、破断圧力を一定に出来ないためであ
る。However, if the above-described aluminum laminate 15 is used for the safety valve mechanism 10, the safety valve rupture pressure will be normal temperature if the battery is misused or the operating environment temperature is high. Tend to be significantly lower than that of This is because the laminate 15 swells when the internal pressure increases, but the swelling method differs depending on the temperature, and the breaking pressure cannot be kept constant.
【０００８】また、上下面が絶縁されているアルミラミ
ネートを用いているため、図４のような封口体を別個に
準備しなければならず、その分電池全体に占める封口体
の割合が大きくなるため、活物質の充填量を増やし、性
能を上げたい場合の大きな障害となっている。従って、
アルミラミネートを用いる手法は、余り好適なものとは
言えない面があった。Further, since an aluminum laminate whose upper and lower surfaces are insulated is used, a sealing body as shown in FIG. 4 must be separately prepared, and the proportion of the sealing body in the whole battery increases accordingly. Therefore, this is a major obstacle when it is desired to increase the filling amount of the active material and improve the performance. Therefore,
The method using an aluminum laminate is not very suitable.
【０００９】[0009]
【発明が解決しようとする課題】そこで、本発明の目的
は、上記従来の欠陥を無くし、温度が変わっても安全弁
の破断圧力を一定に保持でき、且つ、封口部を簡素化で
きる構造簡単な密閉型電池の安全弁を提供することであ
る。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to eliminate the above-mentioned conventional deficiencies, maintain the breaking pressure of the safety valve constant even when the temperature changes, and simplify the structure of the sealing portion. It is to provide a safety valve for a sealed battery.
【００１０】本発明の別の目的は、使用する環境温度の
変化に充分対応でき、温度変化に関わらず一定の破断圧
力を得ることのできる、信頼性に優れた密閉型電池およ
びそれに用いる安全弁を提供するものである。Another object of the present invention is to provide a highly reliable sealed battery which can sufficiently cope with changes in the environmental temperature to be used and can obtain a constant breaking pressure regardless of the temperature change, and a safety valve used therefor. To provide.
【００１１】本発明の更に別の目的は、従来の封口体ま
たはそれに相当する部材・部位を廃し、効果的に活物質
の充填量を増やしことが出きると共に、性能の上昇を図
ることの可能な新規な密閉型電池用安全弁を提供するこ
とである。Still another object of the present invention is to eliminate the conventional sealing body or its corresponding members and parts, effectively increase the amount of active material to be filled, and improve the performance. It is an object of the present invention to provide a novel and novel safety valve for a sealed battery.
【００１２】本発明の更に別の目的は、従来アルミラミ
ネート破断用として正極端子内面に形成されている端子
部の切刃を不要とし、その部分の空間の有効利用を可能
とする密閉型電池用安全弁を提供することである。Still another object of the present invention is to provide a sealed battery which does not require the cutting edge of the terminal portion formed on the inner surface of the positive electrode terminal for breaking the aluminum laminate and makes it possible to effectively use the space in that portion. It is to provide a safety valve.
【００１３】本発明の更に別の目的は、任意に希望する
破断圧力を備えた安全弁機能を達成できる新規な密閉電
池用安全弁を提供することである。It is yet another object of the present invention to provide a novel sealed battery safety valve that can achieve a safety valve function with any desired breaking pressure.
【００１４】本発明の更に他の目的は、電池に組み込ん
だときに、電解液の漏洩経路を完全に閉鎖して、漏液を
防止できる更に改良された密閉電池用安全弁を提供する
ことである。Still another object of the present invention is to provide a further improved safety valve for a sealed battery which can completely close a leakage path of an electrolyte when incorporated in a battery and prevent the leakage. .
【００１５】[0015]
【課題を解決するための手段】本発明は、請求項１に記
載のように、電池内の圧力が上昇し、所定の圧力に達し
たときに破断する安全弁を備えてなる密閉型電池におい
て、金属箔を、中央に開口を有する環状金属板で挟み、
上記２枚の金属板と上記金属箔とを所定位置にて結合さ
せた結合部を形成してなる、密閉型電池の安全弁であ
る。According to the present invention, there is provided a sealed battery comprising a safety valve which breaks when the pressure in the battery rises and reaches a predetermined pressure as described in claim 1. A metal foil is sandwiched between annular metal plates having an opening in the center,
This is a safety valve for a sealed battery, wherein a joint is formed by joining the two metal plates and the metal foil at predetermined positions.
【００１６】更に、請求項２に記載のように、上記結合
部は、同一円周上において断続的な複数の位置に形成さ
れている密閉型電池の安全弁である。Further, as described in claim 2, the connecting portion is a safety valve for a sealed battery formed at a plurality of intermittent positions on the same circumference.
【００１７】更に、請求項３に記載のように、上記結合
部は、同一円周上において全周連続して形成されて円環
状の結合部を構成してなる密閉型電池の安全弁である。Further, as set forth in claim 3, the joint portion is a safety valve for a sealed battery which is formed continuously on the same circumference all around and constitutes an annular joint portion.
【００１８】また、請求項４に記載のように、全周連続
の上記円環状の結合部は、上記金属箔及び上記環状金属
板よりなる三層構造の外周端縁に形成されてなる密閉型
電池の安全弁である。[0018] Further, as described in claim 4, the annular connecting portion that is continuous all around the circumference is formed on the outer peripheral edge of a three-layer structure composed of the metal foil and the annular metal plate. Battery safety valve.
【００１９】更に、請求項５に記載のように、上記２枚
の金属板と金属箔との結合は溶接によるもである密閉型
電池の安全弁である。Further, as described in claim 5, the safety valve of a sealed battery wherein the connection between the two metal plates and the metal foil is by welding.
【００２０】更に、請求項６に記載のように、上記２枚
の金属板と金属箔とを円周上等間隔にて複数箇所溶接さ
れてなる密閉型電池の安全弁である。Further, the present invention provides a safety valve for a sealed battery in which the two metal plates and the metal foil are welded at a plurality of locations at equal intervals on a circumference.
【００２１】更に、請求項７に記載のように、上記の２
枚の金属板は、それぞれ０．１ｍｍ厚のＳＵＳ３０４材
製とし、上記金属箔を１０μｍ厚のＳＵＳ３０４材製と
してなる密閉型電池の安全弁である。Further, as described in claim 7, the above-mentioned 2
Each of the metal plates is a safety valve for a sealed battery in which each of the metal foils is made of a SUS304 material having a thickness of 0.1 mm and the metal foil is made of a SUS304 material having a thickness of 10 μm.
【００２２】更に、請求項８に記載のように、上記金属
板の開口は直径がほぼ１０ｍｍの円形とした密閉型電池
の安全弁である。Further, as described in claim 8, the opening of the metal plate is a safety valve for a sealed battery having a circular shape with a diameter of about 10 mm.
【００２３】更に、請求項９に記載のように、電池内の
圧力が上昇し、所定の圧力に達したときに破断する安全
弁を備えてなる密閉型電池において、金属箔を、中央に
開口を有する環状金属板で挟み、上記２枚の金属板と上
記金属箔とを所定位置にて溶接により結合させてなり、
上記の２枚の金属板は、それぞれおよそ０．１ｍｍ厚の
ＳＵＳ３０４材製とし、上記金属箔をおよそ１０μｍ厚
のＳＵＳ３０４材製とし、上記金属板の開口は直径がほ
ぼ１０ｍｍの円形としたことを特徴とする密閉型電池の
安全弁である。Further, in a sealed battery having a safety valve which breaks when the pressure in the battery rises and reaches a predetermined pressure, the metal foil is provided with an opening at the center. Sandwiched by a ring-shaped metal plate having, the two metal plates and the metal foil are joined at predetermined positions by welding,
The two metal plates are each made of a SUS304 material having a thickness of about 0.1 mm, the metal foil is made of a SUS304 material having a thickness of about 10 μm, and the opening of the metal plate is a circle having a diameter of about 10 mm. It is a safety valve for sealed batteries.
【００２４】更に、請求項１０に記載のように、上記２
枚の金属板と金属箔とを同一円周上において等間隔に複
数箇所スポット溶接されてなる請求項９に記載の密閉型
電池の安全弁である。Further, as described in claim 10, the above-mentioned item (2)
The safety valve of a sealed battery according to claim 9, wherein a plurality of metal plates and a metal foil are spot-welded at a plurality of locations on the same circumference at equal intervals.
【００２５】更に、請求項１１に記載のように、上記２
枚の金属板と上記金属箔とを、同一円周上において全周
連続して溶接されてなる請求項９に記載の密閉型電池の
安全弁である。Further, as described in claim 11, the above-mentioned 2
The safety valve for a sealed battery according to claim 9, wherein the metal plate and the metal foil are continuously welded on the same circumference over the entire circumference.
【００２６】[0026]
【作用】本発明において、電池内の圧力が上昇し、所定
の圧力に達したときに破断する安全弁を備えてなる密閉
型電池において、金属箔を、中央に開口を有する環状金
属板で挟み、上記２枚の金属板と上記金属箔とを所定位
置にて同一円周上を断続的に、或いは全周溶接となるよ
うに連続的に溶接した結合部を形成した安全弁としたこ
とにより、従来のアルミラミネート採用型のように伸び
ることはなく、温度に影響されず、一定の破断圧力を得
ることが出来るものである。According to the present invention, in a sealed battery provided with a safety valve that breaks when the pressure inside the battery rises and reaches a predetermined pressure, the metal foil is sandwiched between annular metal plates having an opening in the center. Conventionally, the two metal plates and the metal foil are connected at predetermined positions on the same circumference either intermittently or continuously, so that the entire circumference is welded. It does not stretch as in the case of the aluminum laminate type, and a constant breaking pressure can be obtained without being affected by the temperature.
【００２７】更に、この安全弁を用いることにより、従
来のように封口体とその為のスペースを必要とせず、狭
い電池内空間を有効利用できる。Further, by using this safety valve, a narrow space in the battery can be effectively used without requiring a sealing body and a space therefor as in the conventional case.
【００２８】更に、金属箔は上下金属板とスポット溶接
などの溶接により固定されるので、従来のアルミラミネ
ートのように内圧の上昇によって膨らまず、従って、従
来必要としていた正極端子部の切刃を設ける必要はな
く、構造上および製造工程上も簡素化できる。Further, since the metal foil is fixed to the upper and lower metal plates by welding such as spot welding, the metal foil does not expand due to an increase in internal pressure as in a conventional aluminum laminate. It is not necessary to provide, and the structure and the manufacturing process can be simplified.
【００２９】また、上記のように伸びない金属を採用す
ることで、従来のように伸びて膨らむ空間を不要とする
ために、封口部全体の簡素化が可能となる。Further, by employing a metal that does not expand as described above, the entire sealing portion can be simplified since a space that expands and expands as in the related art is not required.
【００３０】更に、上記安全弁は、上記２枚の金属板と
上記金属箔とを所定位置にて、同一円周上を連続的に溶
接して全周溶接となる結合部を形成したことにより、電
池に組み込んだときに電解液の漏洩経路を完全に遮断す
ることができ、従って電解液の漏液を確実に防止するこ
とができる。Further, the safety valve is characterized in that the two metal plates and the metal foil are continuously welded on the same circumference at predetermined positions on the same circumference to form a joint portion which is welded all around. When incorporated in a battery, the leakage path of the electrolyte can be completely shut off, and thus the leakage of the electrolyte can be reliably prevented.
【００３１】[0031]
【発明の実施の形態】先ず、図１は、本発明の安全弁が
採用される密閉型電池の構成の１例を示す図である。こ
の図において、図示の電池はリチウム一次電池の縦断面
図であり、この図に示すリチウム一次電池は、シート状
の正極１及び負極２をフィルム上のセパレータ３を挟ん
で重ね合わせると共に、これらを渦巻き状に巻回するこ
とによって形成されたスパイラル電極４と、このスパイ
ラル電極４が収納される負極端子を兼ねた有底筒状の外
装缶５と、この外装缶５の開口部に絶縁ガスケット６を
介して取り付けられ、上記ガスケット６には、上から順
に、正極端子７、過電流防止目的のＰＴＣ素子１２、及
び集電リング９が把持されるように配置されている。前
記外装缶５内には、その開口部の封口に先だって、非水
電解液が注入されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS First, FIG. 1 is a diagram showing an example of the configuration of a sealed battery in which the safety valve of the present invention is employed. In this figure, the illustrated battery is a longitudinal sectional view of a lithium primary battery, and the lithium primary battery shown in the figure overlaps a sheet-like positive electrode 1 and a negative electrode 2 with a separator 3 on a film interposed therebetween, and A spiral electrode 4 formed by spirally winding, an outer casing 5 having a bottomed cylindrical shape also serving as a negative electrode terminal in which the spiral electrode 4 is housed, and an insulating gasket 6 in an opening of the outer can 5 The positive electrode terminal 7, the PTC element 12 for the purpose of overcurrent prevention, and the current collecting ring 9 are arranged on the gasket 6 in order from the top. A non-aqueous electrolyte is injected into the outer can 5 prior to closing the opening.
【００３２】ここまでの構成は前記の従来例（図５）の
構成と大同小異である。本発明では、新規構成の安全弁
２０が配置されている。（図示例では、安全弁２０はＰ
ＴＣ素子１２と集電リング９との間に配置されてい
る。）The configuration described so far is substantially the same as the configuration of the above-described conventional example (FIG. 5). In the present invention, a safety valve 20 having a novel configuration is arranged. (In the illustrated example, the safety valve 20 is P
It is arranged between the TC element 12 and the current collecting ring 9. )
【００３３】さて、上記のような密閉型の電池におい
て、安全弁２０は図２に示すように、中心部分のみを１
層とし、その他の部分を３層構造となっている。即ち、
安全弁２０は中心に開口２１を穿設したドーナツ状の金
属板より成る上層２２と上記上層２２と同じ形状と材質
の下層２３と、この上層２２と下層２３の２枚の金属板
の間に介装させた、円形シート状の金属箔２４を備えて
なる。上記上層２２と下層２３の中心部に設けた開口２
１は、前記正極端子７の上方に突出した突出部７ａの径
とほぼ同じ大きさの径を有している。これは、安全弁２
０の中間層２４を構成する金属箔が破断する位置と対応
させたためである。即ち、金属箔の破断位置が正極端子
７の上記突起部７ａが形成する内部空間に合致させた位
置にて破断し易くしたものである。Now, in the above sealed battery, as shown in FIG. 2, the safety valve 20 has only one central portion.
The other parts have a three-layer structure. That is,
The safety valve 20 is provided with an upper layer 22 made of a donut-shaped metal plate having an opening 21 formed at the center, a lower layer 23 having the same shape and material as the upper layer 22, and interposed between the two metal plates of the upper layer 22 and the lower layer 23. Further, a metal foil 24 having a circular sheet shape is provided. Opening 2 provided at the center of upper layer 22 and lower layer 23
1 has a diameter substantially equal to the diameter of the protruding portion 7 a protruding above the positive electrode terminal 7. This is safety valve 2
This is because the position corresponds to the position at which the metal foil constituting the 0 intermediate layer 24 breaks. That is, the metal foil is easily broken at a position where the breaking position of the metal foil matches the internal space formed by the protrusion 7a of the positive electrode terminal 7.
【００３４】また、金属板の上層２２と下層２３は、ス
テンレス鋼よりなり、具体的には、厚みがそれぞれ０．
１ｍｍのＳＵＳ３０４材より成り、両者に挟まれた円盤
状の金属箔２４は厚みを１０μｍのＳＵＳ３０４材より
形成したものである。このように３枚の金属薄板を重ね
合わせて、開口２１のやや外側の円周上にて、好ましく
はスポット溶接により三者を結合させている。図示の例
では、溶接部は円周上に等間隔の４カ所の結合部２５と
なっているが、溶接の位置と数は適宜選択可能である
が、図示のように開口２１の近傍に、同一円周上となる
ように４個若しくはそれ以上とすることが望ましい。勿
論、結合部２５の位置を開口２１近傍ではなしに、図示
を省略するが、外周端縁近傍あるいは外終端縁と開口２
１との間の適当な部位に形成することも可能である。The upper layer 22 and the lower layer 23 of the metal plate are made of stainless steel.
The disk-shaped metal foil 24 made of SUS304 material of 1 mm and sandwiched between them is formed of SUS304 material having a thickness of 10 μm. In this way, the three thin metal plates are overlapped, and the three members are joined on the circumference slightly outside the opening 21 preferably by spot welding. In the example shown in the figure, the welded portions are four joints 25 at equal intervals on the circumference, but the position and number of welding can be appropriately selected. It is desirable that the number is four or more so as to be on the same circumference. Of course, the position of the connecting portion 25 is not shown near the opening 21 and is not shown.
It is also possible to form at an appropriate site between the two.
【００３５】次に、本発明による安全弁２０と、アルミ
ラミネートを用いた従来の安全弁構造（図５及び図６の
構造）とをスパイラル型のリチウム電池に適用した実験
を行ったところ、下のような結果が得られた。Next, an experiment was conducted in which the safety valve 20 according to the present invention and a conventional safety valve structure using aluminum laminate (the structure shown in FIGS. 5 and 6) were applied to a spiral-type lithium battery. Results were obtained.
【００３６】ここで、本発明の安全弁２０は、金属の上
下板２２，２３をそれぞれ０．１ｍｍ厚としたＳＵＳ３
０４材とし、中間の金属箔２４を１０μｍの厚みのＳＵ
Ｓ３０４材としたものでを使用した。また、従来のアル
ミラミネート１５としては上下のポリプロピレン層をそ
れぞれ６０μｍとし、中間のアルミニウム層を３０μｍ
の三層構造ものを使用した。Here, the safety valve 20 of the present invention is a SUS3 having metal upper and lower plates 22 and 23 each having a thickness of 0.1 mm.
04 material, and the intermediate metal foil 24 is made of SU having a thickness of 10 μm.
S304 material was used. Further, as the conventional aluminum laminate 15, the upper and lower polypropylene layers are each 60 μm, and the intermediate aluminum layer is 30 μm.
Having a three-layer structure.
【００３７】 （表１） 温度：２０℃ 温度：８０℃ 本発明品 １６kgf/cm2 １５kgf/cm2 従来品 １５kgf/cm2 ７kgf/cm2 (Table 1) Temperature: 20 ° C. Temperature: 80 ° C. present invention product 16kgf / cm 2 15kgf / cm 2 conventional 15kgf / cm 2 7kgf / cm 2
【００３８】上記において、アルミラミネートを用いた
従来製品の場合、温度が２０℃から８０℃に上昇した場
合に破断圧力が半分以下に低下するのに対して、上下金
属板２２，２３と金属箔２４との組合せとした本発明の
安全弁２０を採用した場合には、温度により殆ど影響さ
れないことが判明した。In the above, in the case of a conventional product using an aluminum laminate, the breaking pressure decreases to less than half when the temperature rises from 20 ° C. to 80 ° C., whereas the upper and lower metal plates 22 and 23 and the metal foil It has been found that when the safety valve 20 of the present invention in combination with No. 24 is employed, it is hardly affected by the temperature.
【００３９】また、詳述を省略するが、金属箔の厚さ、
上下金属板に形成した中央部の開口の大きさを変えるこ
とで、任意に希望する破断圧力を備えた安全弁を形成す
ることが可能となることを知得した。Although not described in detail, the thickness of the metal foil,
By changing the size of the central opening formed in the upper and lower metal plates, it has been found that it is possible to form a safety valve having a desired breaking pressure.
【００４０】図３と図４は、本発明の第２実施例と第３
実施例をそれぞれ示すものであり、図２の実施例では溶
接箇所となる結合部２５を、開口２１と外周縁２６との
間の円周上を全周に渡って形成された構成を示してお
り、また、図４の実施例では外周縁２６に形成した構成
を示している。いずれの場合も、溶接箇所は円環状に、
連続して形成されているのが、図２の実施例と大きく相
違する点である。FIGS. 3 and 4 show the second embodiment of the present invention and the third embodiment.
FIG. 2 shows an embodiment, in which the embodiment shown in FIG. 2 shows a configuration in which a joint 25 serving as a welding portion is formed over the entire circumference between the opening 21 and the outer peripheral edge 26. In addition, the embodiment shown in FIG. 4 shows a configuration formed on the outer peripheral edge 26. In each case, the weld is annular,
The continuous formation is a point that is significantly different from the embodiment of FIG.
【００４１】上記図３と図４に示す実施例では、図２の
ように溶接部が複数個点在するのではなく、円環状に連
続した全周溶接としているので、当該安全弁を電池に組
み込んだときに電解液が外部に流れ出るような経路を安
全弁に生じるようなことはなく、完全に漏洩経路を遮断
できる。実際に１００個の電池に関して７０℃での８０
日間の耐漏液試験を行ったところ、どの電池にも漏液が
生じた形跡は皆無であった。In the embodiment shown in FIG. 3 and FIG. 4, the safety valve is incorporated in the battery because the welding is not continuous as shown in FIG. In such a case, a path through which the electrolyte flows out to the outside does not occur in the safety valve, and the leakage path can be completely shut off. Actually 80 at 70 ° C. for 100 cells
When a liquid leakage resistance test was performed for a day, there was no evidence of liquid leakage in any of the batteries.
【００４２】[0042]
【発明の効果】以上のように、本発明によれば、従来技
術に見られる種々の欠陥を払拭でき、温度に影響されな
い、一定の破断圧力を得ることのできる改良された密閉
型電池用安全弁を提供できる。As described above, according to the present invention, an improved safety valve for a sealed battery which can eliminate various defects found in the prior art and can obtain a constant breaking pressure which is not affected by temperature can be obtained. Can be provided.
【００４３】更に、従来のように封口体を用いる必要が
ないし、また、金属箔は上下金属板と溶接により固定さ
れているので、電池内圧が上昇したときに、膨らまない
ので端子部の切刃を設ける必要はなく、従ってその為の
空間を設ける必要はない。更に、金属箔を使用している
ので、従来のアルミラミネートの用には伸張することは
なく、その為の空域を設ける必要が無く、封口部の簡素
化ができる。Further, it is not necessary to use a sealing body as in the prior art, and since the metal foil is fixed to the upper and lower metal plates by welding, it does not expand when the internal pressure of the battery rises, so that the cutting edge of the terminal portion is not swelled. Therefore, there is no need to provide a space therefor. Further, since the metal foil is used, it is not stretched for the conventional aluminum laminate, and there is no need to provide an air space therefor, and the sealing portion can be simplified.
【００４４】更に、溶接箇所を円環状に連続して形成す
る構成とすることで全周溶接としている構成の場合で
は、当該安全弁を電池に組み込んだときに電解液が外部
に流れ出るような経路が安全弁に形成されるようなこと
はなく、完全に漏洩経路を遮断できるという効果を有す
る。従って、電池全体として更に信頼性の高い密閉型電
池を提供できるものである。Further, in the case of a configuration in which the welded portion is formed continuously in an annular shape to perform full-circle welding, a path through which the electrolyte flows out to the outside when the safety valve is incorporated in the battery. There is no effect that the safety valve is formed and the leakage path can be completely shut off. Therefore, a highly reliable sealed battery can be provided as a whole battery.
【００４５】[0045]
【図１】本発明による安全弁を採用した密閉型電池の一
例を示す断面図である。FIG. 1 is a sectional view showing an example of a sealed battery employing a safety valve according to the present invention.
【図２】本発明の第１の実施例による密閉型電池用安全
弁の構成を示す図であり、（ａ）は平面図、（ｂ）は断
面図である。FIGS. 2A and 2B are diagrams showing a configuration of a safety valve for a sealed battery according to a first embodiment of the present invention, wherein FIG. 2A is a plan view and FIG.
【図３】本発明の第２の実施例による密閉型電池用安全
弁の構成を示す図であり、（ａ）は平面図、（ｂ）は断
面図である。3A and 3B are diagrams showing a configuration of a safety valve for a sealed battery according to a second embodiment of the present invention, wherein FIG. 3A is a plan view and FIG. 3B is a cross-sectional view.
【図４】本発明の第３の実施例による密閉型電池用安全
弁の構成を示す図であり、（ａ）は平面図、（ｂ）は断
面図である。4A and 4B are diagrams showing a configuration of a safety valve for a sealed battery according to a third embodiment of the present invention, wherein FIG. 4A is a plan view and FIG. 4B is a cross-sectional view.
【図５】従来の密閉型電池の安全弁機構を示す断面図で
ある。FIG. 5 is a sectional view showing a conventional safety valve mechanism of a sealed battery.
【図６】図５に示した従来の安全弁機構を示す拡大断面
図である。FIG. 6 is an enlarged sectional view showing the conventional safety valve mechanism shown in FIG.
７ 正極端子 ７ａ 正極端子の突起部 １０ 従来の安全弁機構 １５ 従来のアルミラミネート ２０ 本発明の安全弁 ２１ 安全弁の開口 ２２ 安全弁２０の上層（金属板） ２３ 安全弁２０の下層（金属板） ２４ 安全弁２０の中間層（金属箔） ２５ 結合部 ２６ 外周端縁 7 Positive electrode terminal 7a Protrusion of positive electrode terminal 10 Conventional safety valve mechanism 15 Conventional aluminum laminate 20 Safety valve of the present invention 21 Opening of safety valve 22 Upper layer of safety valve 20 (metal plate) 23 Lower layer of safety valve 20 (metal plate) 24 Safety valve 20 Intermediate layer (metal foil) 25 Joint 26 Outer edge
───────────────────────────────────────────────────── フロントページの続き (72)発明者 村田 千洋 東京都港区新橋５丁目36番11号 エフ・デ ィー・ケイ株式会社内 (72)発明者 太田 廣彦 東京都港区新橋５丁目36番11号 エフ・デ ィー・ケイ株式会社内 Ｆターム(参考） 5H012 AA01 BB02 DD01 DD03 DD06 EE04 FF01 GG01 JJ02 JJ10 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Chihiro Murata 5-36-11 Shimbashi, Minato-ku, Tokyo FDC Corporation (72) Inventor Hirohiko Ota 5-chome, Shimbashi, Minato-ku, Tokyo 36-11 No. F-term in FDK Corporation (reference) 5H012 AA01 BB02 DD01 DD03 DD06 EE04 FF01 GG01 JJ02 JJ10
Claims (11)
たときに破断する安全弁を備えてなる密閉型電池におい
て、金属箔を、中央に開口を有する環状金属板で挟み、
上記２枚の金属板と上記金属箔とを所定位置にて結合さ
せた結合部を形成してなる、密閉型電池の安全弁。1. A sealed battery comprising a safety valve which breaks when the pressure inside the battery rises and reaches a predetermined pressure, wherein a metal foil is sandwiched between annular metal plates having an opening in the center.
A safety valve for a sealed battery, wherein a connection portion is formed by connecting the two metal plates and the metal foil at predetermined positions.
な複数の位置に形成されている、請求項１に記載の密閉
型電池の安全弁。2. The safety valve for a sealed battery according to claim 1, wherein the coupling portion is formed at a plurality of intermittent positions on the same circumference.
続して形成されて円環状の結合部を構成してなる、請求
項１に記載の密閉型電池の安全弁。3. The safety valve for a sealed battery according to claim 1, wherein the connecting portion is formed continuously on the entire circumference on the same circumference to form an annular connecting portion.
属箔及び上記環状金属板よりなる三層構造の外周端縁に
形成されてなる、請求項３に記載の密閉型電池の安全
弁。4. The sealed battery according to claim 3, wherein the annular connecting portion that is continuous all around is formed on an outer peripheral edge of a three-layer structure including the metal foil and the annular metal plate. safety valve.
によるもである請求項１に記載の密閉型電池の安全弁。5. The safety valve according to claim 1, wherein the connection between the two metal plates and the metal foil is made by welding.
隔にて複数箇所溶接されてなる請求項２に記載の密閉型
電池の安全弁。6. The safety valve for a sealed battery according to claim 2, wherein the two metal plates and the metal foil are welded at a plurality of locations at equal intervals on a circumference.
ｍ厚のＳＵＳ３０４材製とし、上記金属箔を１０μｍ厚
のＳＵＳ３０４材製としてなる、請求項１に記載の密閉
型電池の安全弁。7. The two metal plates each have a thickness of 0.1 m.
The safety valve for a sealed battery according to claim 1, wherein the metal foil is made of a SUS304 material having a thickness of 10 m and the metal foil is made of a SUS304 material having a thickness of 10 m.
円形とした請求項１に記載の密閉型電池の安全弁。8. The safety valve for a sealed battery according to claim 1, wherein the opening of the metal plate has a circular shape with a diameter of about 10 mm.
したときに破断する安全弁を備えてなる密閉型電池にお
いて、金属箔を、中央に開口を有する環状金属板で挟
み、上記２枚の金属板と上記金属箔とを所定位置にて溶
接により結合させてなり、上記の２枚の金属板は、それ
ぞれおよそ０．１ｍｍ厚のＳＵＳ３０４材製とし、上記
金属箔をおよそ１０μｍ厚のＳＵＳ３０４材製とし、上
記金属板の開口は直径がほぼ１０ｍｍの円形としたこと
を特徴とする密閉型電池の安全弁。9. A sealed battery comprising a safety valve which breaks when the pressure inside the battery rises and reaches a predetermined pressure, wherein the metal foil is sandwiched between annular metal plates having an opening in the center. The two metal plates are joined by welding at predetermined positions, and the two metal plates are each made of a SUS304 material having a thickness of about 0.1 mm, and the metal foil is formed of a material having a thickness of about 10 μm. A safety valve for a sealed battery, wherein the valve is made of SUS304 material and the opening of the metal plate has a circular shape with a diameter of about 10 mm.
上において等間隔に複数箇所スポット溶接されてなる請
求項９に記載の密閉型電池の安全弁。10. The safety valve for a sealed battery according to claim 9, wherein the two metal plates and the metal foil are spot-welded at a plurality of locations on the same circumference at equal intervals.
一円周上において全周連続して溶接されてなる請求項９
に記載の密閉型電池の安全弁。11. The two metal plates and the metal foil are continuously welded all around the same circumference.
A safety valve for a sealed battery according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001153499A JP2002063886A (en) | 2000-06-06 | 2001-05-23 | Safety valve for sealed battery |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000-168438 | 2000-06-06 | ||
| JP2000168438 | 2000-06-06 | ||
| JP2001153499A JP2002063886A (en) | 2000-06-06 | 2001-05-23 | Safety valve for sealed battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002063886A true JP2002063886A (en) | 2002-02-28 |
Family
ID=26593370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001153499A Pending JP2002063886A (en) | 2000-06-06 | 2001-05-23 | Safety valve for sealed battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002063886A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011233747A (en) * | 2010-04-28 | 2011-11-17 | Jm Energy Corp | Power storage device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04174961A (en) * | 1990-11-07 | 1992-06-23 | Sanyo Electric Co Ltd | Sealed battery |
| JPH0817416A (en) * | 1994-06-30 | 1996-01-19 | Japan Storage Battery Co Ltd | Sealed battery |
| JPH0935699A (en) * | 1995-07-24 | 1997-02-07 | Sony Corp | Sealed battery |
| WO1997030483A1 (en) * | 1996-02-15 | 1997-08-21 | Toyo Kohan Co., Ltd. | Cladding material |
-
2001
- 2001-05-23 JP JP2001153499A patent/JP2002063886A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04174961A (en) * | 1990-11-07 | 1992-06-23 | Sanyo Electric Co Ltd | Sealed battery |
| JPH0817416A (en) * | 1994-06-30 | 1996-01-19 | Japan Storage Battery Co Ltd | Sealed battery |
| JPH0935699A (en) * | 1995-07-24 | 1997-02-07 | Sony Corp | Sealed battery |
| WO1997030483A1 (en) * | 1996-02-15 | 1997-08-21 | Toyo Kohan Co., Ltd. | Cladding material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011233747A (en) * | 2010-04-28 | 2011-11-17 | Jm Energy Corp | Power storage device |
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