JP2003045379A - Coin-shaped battery - Google Patents
Coin-shaped batteryInfo
- Publication number
- JP2003045379A JP2003045379A JP2001230903A JP2001230903A JP2003045379A JP 2003045379 A JP2003045379 A JP 2003045379A JP 2001230903 A JP2001230903 A JP 2001230903A JP 2001230903 A JP2001230903 A JP 2001230903A JP 2003045379 A JP2003045379 A JP 2003045379A
- Authority
- JP
- Japan
- Prior art keywords
- case
- battery
- coin
- gasket
- internal pressure
- 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.)
- Granted
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)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ボタン形電池、扁
平形電池とも称されるコイン形電池に関し、間違った使
用などの原因によって異常に加熱され、且つ内圧が異常
上昇したときに内圧を放出することを可能にする構造を
設けたことを特徴とするものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coin type battery, which is also called a button type battery or a flat type battery, and releases internal pressure when it is abnormally heated due to incorrect use and when the internal pressure rises abnormally. It is characterized in that a structure that enables the operation is provided.
【０００２】[0002]
【従来の技術】コイン形電池は、図７に示すように、円
盤状に形成された正極ペレット３２と負極ペレット３３
とをセパレータ３４を介して対向配置した極板構造のも
のが一般的に採用されている。このコイン形電池は、円
形半殻体に形成された封口ケース３５内に正極ペレット
３２と負極ペレット３３とをセパレータ３４を介して対
向配置し、電解液を注入し、封口ケース３５の側周部に
ガスケット３６を配設し、この上にキャップケース３１
を被せ、キャップケース３１の開口端を内側に折り曲げ
るカシメ加工により内部空間を密閉し、コイン形の外観
を呈する電池に形成される。2. Description of the Related Art A coin type battery, as shown in FIG. 7, is a disk-shaped positive electrode pellet 32 and negative electrode pellet 33.
An electrode plate structure in which and are arranged to face each other via a separator 34 is generally adopted. In this coin-shaped battery, a positive electrode pellet 32 and a negative electrode pellet 33 are arranged to face each other with a separator 34 in a sealing case 35 formed in a circular half-shell body, and an electrolytic solution is injected to the side peripheral portion of the sealing case 35. Gasket 36 is placed on top of which cap case 31 is placed.
Then, the inner space is sealed by a crimping process in which the open end of the cap case 31 is bent inward to form a battery having a coin-shaped appearance.
【０００３】上記のように正極ペレット３２と負極ペレ
ット３３とを１：１で対面させた極板構造では、正極板
と負極板とが対極する反応面積が小さいことなどの要因
によって大きな放電容量を得ることができなかった。大
きな放電容量を得るには正極板と負極板との対極面積を
増加させる必要があり、コイン形電池以外の比較的大型
の電池では複数枚の正極板と負極板とをセパレータを介
して積層した積層構造や、帯状の正極板と負極板とをセ
パレータを介して巻回した巻回構造により、反応面積を
拡大させて放電容量の増大化を図った構造が広く用いら
れている。このような積層構造や巻回構造の極板群をコ
イン形の扁平なケース内に収容することができれば、コ
イン形電池の放電容量を増加させることができる。コイ
ン形の扁平なケース内に巻回構造の極板群を収容した電
池は、本願出願人が特願２０００−２４１６７８号、特
願２０００−２４１６７９号他として提案している。In the electrode plate structure in which the positive electrode pellets 32 and the negative electrode pellets 33 face each other at a ratio of 1: 1 as described above, a large discharge capacity can be obtained due to factors such as a small reaction area where the positive electrode plate and the negative electrode plate are opposed. I couldn't get it. To obtain a large discharge capacity, it is necessary to increase the counter electrode area between the positive electrode plate and the negative electrode plate. For relatively large batteries other than coin type batteries, a plurality of positive electrode plates and negative electrode plates are laminated with a separator in between. A structure in which a reaction area is enlarged and discharge capacity is increased by a laminated structure or a wound structure in which a strip-shaped positive electrode plate and a negative electrode plate are wound with a separator interposed therebetween is widely used. If the electrode plates having such a laminated structure or a wound structure can be housed in a flat coin-shaped case, the discharge capacity of the coin-shaped battery can be increased. A battery in which a wound electrode group is housed in a coin-shaped flat case is proposed by the applicant of the present application as Japanese Patent Application Nos. 2000-241678, 2000-241679, and the like.
【０００４】この巻回構造の極板群を用いたコイン形電
池は、図８に示すように、コイン形のリチウム二次電池
として構成することができる。図８において、円形半殻
体の側周部に段差を形成した封口ケース４内に正極板と
負極板とをセパレータを介して扁平に巻回した極板群１
を収容し、電解液を注入し、封口ケース４の側周部にガ
スケット６を配し、円形半殻体に形成されたキャップケ
ース５１を封口ケース４上に被せ、キャップケース５１
の開口端を縮口するカシメ加工によりガスケット６を段
差上に圧縮することによって極板群１を収容した内部空
間が封止されている。A coin-type battery using this wound electrode group can be constructed as a coin-type lithium secondary battery as shown in FIG. In FIG. 8, an electrode plate group 1 in which a positive electrode plate and a negative electrode plate are flatly wound via a separator in a sealing case 4 in which a step is formed on a side peripheral portion of a circular half shell body
, The electrolyte solution is injected, the gasket 6 is arranged on the side peripheral portion of the sealing case 4, and the cap case 51 formed in a circular half shell is covered on the sealing case 4 to
The inner space accommodating the electrode plate group 1 is sealed by compressing the gasket 6 on the step by caulking the opening end of the electrode plate.
【０００５】[0005]
【発明が解決しようとする課題】上記のように二次電池
として構成されたコイン形電池は、それが接続された回
路の異常により過充電状態に陥ったとき、あるいは使用
環境が厳しい高温状態に曝されたような場合に、内部空
間にガスが発生して内圧が異常上昇する。上昇した内圧
がキャップケース５１による封口強度を越える状態に至
ったとき、キャップケース５１のカシメが一気に外れて
封口ケース４やその他の構成部材が破裂的に飛散する問
題があった。封口ケース４やキャップケース５１のよう
な金属物の飛散は危険であるばかりでなく、コイン形電
池が装着された機器を破損あるいは汚染することにな
る。The coin-type battery constructed as a secondary battery as described above has a problem in that when it is overcharged due to an abnormality in the circuit to which the coin-type battery is connected, or in a high temperature condition where the operating environment is severe. When exposed, gas is generated in the internal space and the internal pressure rises abnormally. When the increased internal pressure exceeds the sealing strength of the cap case 51, the caulking of the cap case 51 comes off at once and the sealing case 4 and other constituent members burst and scatter. Scattering of metal objects such as the sealing case 4 and the cap case 51 is not only dangerous, but also damages or contaminates the device in which the coin battery is mounted.
【０００６】比較的大型のリチウム電池などでは、内圧
が異常上昇したときに上昇した内圧を排出する放出弁な
どが設けられるが、コイン形電池をはじめとする小型の
電池では放出弁のような構造を設けるスペースがなく、
ケースの平面部に刻印による薄肉部分を形成して異常内
圧放出のための破断部位とするのが一般的である。しか
し、安定した異常内圧放出の動作が得られない問題があ
った。A relatively large lithium battery or the like is provided with a discharge valve or the like for discharging the increased internal pressure when the internal pressure abnormally rises. However, in a small battery such as a coin battery, a structure like a discharge valve is provided. There is no space to install
It is common to form a thin portion by engraving on the plane portion of the case to serve as a fracture site for releasing the abnormal internal pressure. However, there is a problem that a stable operation of releasing the abnormal internal pressure cannot be obtained.
【０００７】本発明が目的とするところは、電池を破裂
させることなく高温に曝されて異常上昇した内圧を安定
して放出する構造を設けたコイン形電池を提供すること
にある。An object of the present invention is to provide a coin-type battery provided with a structure for stably releasing an abnormally increased internal pressure by exposing the battery to high temperatures without causing the battery to burst.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
の本発明は、半殻体の側周部が段差を設けて形成された
封口ケースと、この封口ケースより大きな外径の半殻体
に形成されたキャップケースとを、互いの開口部を対向
させ、互いの側周部の間にガスケットを介在させて封口
ケース上にキャップケースを被せた内部空間内に発電要
素を収容し、キャップケースの開口端を縮口するカシメ
加工によりガスケットを前記段差上に圧縮することによ
って前記内部空間が密閉されてなるコイン形電池におい
て、前記キャップケースの開口端に、それを切り欠いた
切欠部が１か所以上に形成されてなることを特徴とす
る。DISCLOSURE OF THE INVENTION To achieve the above object, the present invention relates to a sealing case formed by forming a step on the side peripheral portion of a half shell, and a half shell having an outer diameter larger than this sealing case. The cap case formed on the inner side of the cap case and the cap case formed on the sealing case are covered with a gasket between the side peripheral parts of the cap case and the cap case. In a coin-shaped battery in which the internal space is sealed by compressing the gasket on the step by caulking to reduce the opening end of the case, the opening end of the cap case has a notch cut out from it. It is characterized in that it is formed in one or more places.
【０００９】上記構成によれば、キャップケースの開口
端に形成された切欠部の位置では、電池が高温に曝さ
れ、内圧が異常上昇したとき、切欠部周辺の軟化したガ
スケットが切欠部に押し込まれるため封口に緩みが生じ
て内圧が放出される。従って、内圧が封口強度を上回っ
て電池ケースのカシメが一気に外れる破裂に至る以前に
内圧が放出され、切欠部により異常内圧を放出する放出
弁の効果を得ることができる。よって、高温状態に曝さ
れたときには、ガスケットとして適用された樹脂材料の
軟化変形により、切欠部から内圧を放出することができ
る。According to the above construction, at the position of the notch formed at the opening end of the cap case, when the battery is exposed to high temperature and the internal pressure rises abnormally, the softened gasket around the notch is pushed into the notch. As a result, the seal is loosened and the internal pressure is released. Therefore, the internal pressure is released before the internal pressure exceeds the sealing strength and the caulking of the battery case suddenly comes off, and the effect of the release valve that releases the abnormal internal pressure by the notch can be obtained. Therefore, when exposed to a high temperature state, the internal pressure can be released from the notch due to the softening deformation of the resin material applied as the gasket.
【００１０】上記構成において、複数の切欠部を開口端
の一方に偏って形成することにより、カシメ封口の弱い
部分が一方に偏るので、高温に曝されると同時に異常上
昇した内圧は封口の弱い部分から放出され、内圧が全体
に加わって破裂的に封口が破壊されることが回避され
る。In the above structure, since the plurality of cutouts are formed in one of the opening ends, the weak portion of the caulking sealing is biased in one side, so that the internal pressure that is exposed to high temperature and abnormally rises at the same time is weak in the sealing. It is released from the part and internal pressure is applied to the whole to avoid burst breaking of the seal.
【００１１】また、切欠部の深さは、キャップケースを
ガスケットを介して封口ケースに被せたとき、その最深
部が封口ケースの側周部に形成された段差の肩部分の高
さ位置と略同等の位置になるように形成するのが好適
で、電池温度と電池内圧が上昇したとき、切欠部周辺の
ガスケットの変形と流動によりガスケットのシール力に
緩みが生じ、切欠部によるガスケットの圧縮度合いの小
さい部分から内圧を放出する作用が確実になされる。Further, the depth of the cutout portion is substantially the same as the height position of the shoulder portion of the step formed on the side peripheral portion of the sealing case when the cap case is covered with the sealing case via the gasket. It is preferable to form them so that they are located at the same position, and when the battery temperature and the battery internal pressure rise, the gasket sealing force around the notch becomes loose due to deformation and flow of the gasket, and the degree of compression of the gasket by the notch The action of releasing the internal pressure from a small portion of the is surely performed.
【００１２】[0012]
【発明の実施の形態】以下、添付図面を参照して本発明
の実施形態について説明し、本発明の理解に供する。
尚、以下に示す実施形態は本発明を具体化した一例であ
って、本発明の技術的範囲を限定するものではない。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.
The embodiments described below are examples of embodying the present invention and do not limit the technical scope of the present invention.
【００１３】図１は、実施形態に係る電池の構成を示す
断面図で、発電要素である極板群１及び電解液を封口ケ
ース４とキャップケース５とにより形成される内部空間
内に封入したコイン形のリチウム二次電池として構成さ
れたものである。尚、以下に示す実施形態の構成では従
来構成と共通する構成要素には同一の符号を付してい
る。FIG. 1 is a cross-sectional view showing the structure of the battery according to the embodiment, in which an electrode plate group 1 as a power generating element and an electrolytic solution are enclosed in an internal space formed by a sealing case 4 and a cap case 5. It is configured as a coin-type lithium secondary battery. In the configuration of the embodiment described below, the same components as those in the conventional configuration are designated by the same reference numerals.
【００１４】このコイン形電池は、正極板と負極板とを
セパレータを介して扁平に巻回した極板群１を用いてコ
イン形電池としての放電容量の増加を図っている。この
極板群１を円形半殻体の側周部４ｄが段差部４ｂを設け
て形成された封口ケース４に収容し、電解液を注入し、
封口ケース４の側周部４ｄにガスケット６を配設して、
円形半殻体に形成されたキャップケース５を封口ケース
４の開口部を閉じるように被せ、キャップケース５の開
口端を内側に折り曲げるカシメ加工によりガスケット６
を圧縮して極板群１及び電解液を収容した内部空間を封
止して製作される。キャップケース５はその底面５ａに
極板群１の正極板が圧接して電池の正極を構成し、封口
ケース４はその底面４ａに極板群１の負極板が圧接して
電池の負極を構成している。より好ましくは、正極板か
ら引き出した正極リードをキャップケース５の底面５ａ
に溶接し、負極板から引き出した負極リードを封口ケー
ス４の底面４ａに溶接する接続方法を適用することがで
き、接続がより確実となって内部抵抗の低減に効果的で
ある。In this coin-type battery, an electrode group 1 in which a positive electrode plate and a negative electrode plate are flatly wound via a separator is used to increase the discharge capacity of the coin-type battery. The electrode plate group 1 is housed in a sealing case 4 formed by forming a step portion 4b on a side peripheral portion 4d of a circular half shell, and injecting an electrolytic solution,
By arranging the gasket 6 on the side peripheral portion 4d of the sealing case 4,
The cap case 5 formed into a circular half shell is covered so as to close the opening of the sealing case 4, and the gasket 6 is crimped by bending the opening end of the cap case 5 inward.
Is manufactured by sealing the inner space containing the electrode plate group 1 and the electrolytic solution by compressing. The positive electrode plate of the electrode plate group 1 is pressed against the bottom surface 5a of the cap case 5 to form the positive electrode of the battery, and the sealing case 4 is formed of the negative electrode plate of the electrode plate group 1 is pressed against the bottom surface 4a to form the negative electrode of the battery. is doing. More preferably, the positive electrode lead drawn from the positive electrode plate is attached to the bottom surface 5 a of the cap case 5.
It is possible to apply a connection method in which the negative electrode lead that is welded to the negative electrode plate and welded to the bottom surface 4a of the sealing case 4 is applied, and the connection becomes more reliable, which is effective in reducing the internal resistance.
【００１５】このコイン形電池が接続された回路の故障
などにより過充電になったときや、高温環境下に曝され
たような場合に、極板群１を収容した内部空間にガスが
発生して内圧が異常上昇する。このような小型の電池で
は、内圧が異常上昇したときに、比較的大型の電池に設
けられているような内圧を放出する排出弁を設けるだけ
のスペースを確保することができない。従って、コイン
形電池では内圧が異常上昇して限界圧力に達すると、前
述したようにキャップケース５のカシメが一気に外れて
キャップケース５やその他の構成部材が飛散し、人体や
機器に損傷を与える恐れがある。特に、二次電池では充
電という動作が伴うため一次電池に比して内圧が異常上
昇する度合いは大きくなる。それは、過充電や逆充電、
短絡、あるいは高温の環境下に曝されたような場合であ
り、ガスの発生や膨張により内圧が異常上昇する状態が
一次電池より多くなる。従って、異常上昇した内圧の放
出機能をコイン形電池においても設けることが望まし
く、本実施形態に係る電池では、以下に示す異常内圧の
放出構造が設けられている。Gas is generated in the internal space accommodating the electrode plate group 1 when it is overcharged due to a failure of the circuit to which the coin battery is connected or when it is exposed to a high temperature environment. And the internal pressure rises abnormally. With such a small battery, it is not possible to secure a space for providing an exhaust valve that releases the internal pressure, which is provided in a relatively large battery when the internal pressure rises abnormally. Therefore, when the internal pressure of the coin-type battery abnormally rises and reaches the limit pressure, the caulking of the cap case 5 is disengaged at once and the cap case 5 and other components are scattered to damage the human body and equipment. There is a fear. In particular, since the secondary battery is accompanied by an operation of charging, the degree of abnormal increase in the internal pressure is higher than that of the primary battery. It can be overcharged or reverse charged,
In the case where the battery is exposed to a short circuit or a high temperature environment, the state in which the internal pressure abnormally rises due to the generation and expansion of gas becomes larger than that in the primary battery. Therefore, it is desirable to provide the coin-shaped battery with the function of releasing the abnormally increased internal pressure, and the battery according to the present embodiment is provided with the abnormal internal pressure releasing structure described below.
【００１６】図２は、コイン形電池の外装ケースを構成
する封口ケース４及びガスケット６、キャップケース５
を組み立て加工前の状態で示すもので、封口ケース４
は、その側周部４ｄが段差部４ｂを設けて形成された円
形半殻体に形成されている。また、ガスケット６は、ポ
リプロピレン等の樹脂により封口ケース４の側周部４ｄ
に嵌まり合う溝を設けて形成され、正極となるキャップ
ケース５と負極となる封口ケース４との間を絶縁すると
共に、封口ケース４とキャップケース５とに囲まれた内
部空間を密閉する封止材の役割を担っている。また、キ
ャップケース５は、前記封口ケース４の直径より大きな
直径の円形半殻体に形成され、開口端を直径線Ｄで２分
した一方の１８０度を等分に分割した位置に複数（５か
所）の切欠部２が形成されている。切欠部２の形状は、
本実施形態の構成においては、図３（ａ）に示すように
半径０．５ｍｍＲの半円形に形成しているが、図３
（ｂ）（ｃ）に示すように、Ｖの字状あるいは矩形状に
形成してもよい。また、切欠部２の深さは、封口ケース
及びキャップケース、ガスケット６の寸法形状によって
変わる値で、本実施形態の直径３０ｍｍ、高さ３．２ｍ
ｍ、板厚０．３ｍｍのコイン形電池の場合では、０．５
ｍｍに形成されている。FIG. 2 shows a sealing case 4, a gasket 6 and a cap case 5 which constitute an outer case of a coin battery.
The assembly case 4 is shown in a state before being assembled and processed.
The side peripheral portion 4d is formed into a circular half shell formed by providing the step portion 4b. Further, the gasket 6 is made of a resin such as polypropylene and has a side peripheral portion 4d of the sealing case 4.
Is formed by providing a groove to be fitted into the cap case 5, which insulates between the cap case 5 serving as the positive electrode and the sealing case 4 serving as the negative electrode, and seals the internal space surrounded by the sealing case 4 and the cap case 5. It plays the role of a stopping material. Further, the cap case 5 is formed in a circular half shell having a diameter larger than that of the sealing case 4, and a plurality of (5 The notch 2 is formed at the location. The shape of the notch 2 is
In the configuration of this embodiment, as shown in FIG. 3A, the semi-circular shape having a radius of 0.5 mmR is formed.
As shown in (b) and (c), it may be formed in a V shape or a rectangular shape. Further, the depth of the notch 2 is a value that changes depending on the dimensions and shape of the sealing case, the cap case, and the gasket 6, and the diameter of this embodiment is 30 mm and the height is 3.2 m.
m and a coin-type battery with a plate thickness of 0.3 mm, 0.5
It is formed in mm.
【００１７】上記封口ケース４に、その側周部４ｄにガ
スケット６を嵌め込み、極板群１及び電解液を収めた
後、封口ケース４上にキャップケース５を被せた状態
を、図２に示すキャップケース５のＡ−Ａ線矢視断面で
図４に示す。この状態でキャップケース５に形成された
切欠部２の最深部の位置は、本実施形態の構成において
は封口ケース４の段差部４ｂが側周部４ｄに至る肩部４
ｃの高さ位置と略同等の深さになるように形成されてい
る。FIG. 2 shows a state in which a gasket 6 is fitted to the side peripheral portion 4d of the sealing case 4, the electrode plate group 1 and the electrolytic solution are stored, and then the sealing case 4 is covered with the cap case 5. FIG. 4 is a cross-sectional view taken along the line AA of the cap case 5. In this state, the position of the deepest portion of the notch 2 formed in the cap case 5 is the shoulder portion 4 where the step portion 4b of the sealing case 4 reaches the side peripheral portion 4d in the configuration of the present embodiment.
It is formed to have a depth substantially equal to the height position of c.
【００１８】上記キャップケース５の開口端は、プレス
金型によって所定の曲げアールで内側に折り曲げるカシ
メ加工がなされることにより、図１に示すように、極板
群１及び電解液を収容した内部空間を密閉したコイン形
電池に完成される。カシメ加工は内側に折り曲げたキャ
ップケース５の開口端によりガスケット６を封口ケース
４の段差部４ｂ上に圧縮することにより内部空間から外
部への通路が閉鎖される。The opening end of the cap case 5 is subjected to a crimping process in which it is bent inward with a predetermined bending radius by a press die, and as shown in FIG. Completed into a coin-type battery with a sealed space. In the crimping process, the opening end of the cap case 5 bent inward compresses the gasket 6 onto the step portion 4b of the sealing case 4, thereby closing the passage from the internal space to the outside.
【００１９】このコイン形電池が高温に曝され、内部空
間にガスが発生して内圧が異常上昇したとき、図５に示
すように、封口ケース４の底面４ａが内圧により外側に
膨らむと、その直径が縮小する状態になり、ガスケット
６は封口ケース４の変形により内側に引かれるので、ガ
スケット６とキャップケース５との間の密着性が低下す
る。キャップケース５に形成された切欠部２の形成部位
では、高温の雰囲気になり内圧が異常上昇したとき切欠
部２の周辺のガスケット６が軟化し、変形して切欠部２
に流動するので、結果的にガスケット６のシール力が低
下し、切欠部２から内圧が放出される。また、図２に示
すように、複数の切欠部２は、開口端の円周上を直径線
Ｄで二分した一方に偏って形成されているので、ガスケ
ット６の軟化流動が局在し、特にガスケット６の流動は
直径線Ｄの線上に集中するので、内圧は封口度の弱い一
方側から放出され、キャップケース５の全体に圧力が加
わらないので、キャップケース５のカシメが一気に外れ
ることはなく、切欠部２が形成された一方側のカシメが
外れて構成部材を飛散させることなく封口ケース４があ
たかも貝の口が開くようにして内圧を放出する。When this coin-shaped battery is exposed to a high temperature, gas is generated in the internal space and the internal pressure rises abnormally, as shown in FIG. 5, when the bottom surface 4a of the sealing case 4 bulges outward due to the internal pressure, Since the diameter is reduced and the gasket 6 is pulled inward by the deformation of the sealing case 4, the adhesion between the gasket 6 and the cap case 5 is reduced. At the portion where the notch 2 is formed in the cap case 5, the gasket 6 around the notch 2 is softened and deformed when the internal pressure is abnormally increased due to a high temperature atmosphere, and the notch 2 is deformed.
As a result, the sealing force of the gasket 6 is reduced, and the internal pressure is released from the notch 2. Further, as shown in FIG. 2, since the plurality of notches 2 are formed so as to be biased to one side divided by the diameter line D on the circumference of the opening end, the softening flow of the gasket 6 is localized, and particularly Since the flow of the gasket 6 is concentrated on the line of the diameter line D, the internal pressure is released from the one side where the sealing degree is weak and the pressure is not applied to the entire cap case 5, so the caulking of the cap case 5 does not come off at once. The internal pressure is released by opening the shell case 4 as if the shell case opens without the caulking on one side where the notch 2 is formed coming off and scattering the constituent members.
【００２０】上記のようにキャップケース５に切欠部２
を形成することによって、高温に曝された電池の異常上
昇した内圧を放出することができる効果を実証テストに
より検証した。この実証テストでは、切欠部２の形成数
による内圧放出の効果についても検証するために、実施
例〜と、従来例について同条件で破裂試験を実施
した。実施例は本実施形態の構成と同じく図６に示す
切欠部２Ａ〜２Ｅを５か所に形成したキャップケース５
を用いて組み立てたリチウム二次電池、実施例は図６
に示す切欠部２Ｂ、２Ｃ、２Ｄを３か所に形成したキャ
ップケース５を用いて組み立てたリチウム二次電池、実
施例は図６に示す切欠部２Ｃを１か所に形成したキャ
ップケース５を用いて組み立てたリチウム二次電池、従
来例は従来構成のように切欠部２が形成されてないキ
ャップケース５１を用いて組み立てたリチウム二次電池
である。As described above, the notch 2 is formed in the cap case 5.
The effect of releasing the abnormally increased internal pressure of the battery exposed to high temperature by forming the above was verified by the demonstration test. In this proof test, in order to verify the effect of releasing the internal pressure depending on the number of the cutouts 2 formed, a burst test was carried out under the same conditions for Examples 1 to 3 and the conventional example. The example is the same as the configuration of the present embodiment, and the cap case 5 in which the notches 2A to 2E shown in FIG.
A lithium secondary battery assembled by using the
The lithium secondary battery assembled by using the cap case 5 in which the cutouts 2B, 2C, and 2D shown in FIG. 3 are formed in three places. In the embodiment, the cap case 5 in which the cutouts 2C are formed in one place is shown in FIG. The lithium secondary battery assembled by using the conventional example is a lithium secondary battery assembled by using the cap case 51 in which the notch 2 is not formed unlike the conventional configuration.
【００２１】実施例〜及び従来例について、それ
ぞれ５個作製し、各電池について内圧が上昇したとき
に、内圧が放出されるか否か、電池の構成要素が破裂的
に飛散するか否かを検証する破裂試験を実施した。この
検証のために、予め所定の温度に設定した熱板を用意
し、熱板上に置いた被検電池の破裂の有無と破裂に至る
までの時間を測定した。この熱板を用いた破裂試験の結
果を表１に示す。Five samples were prepared for each of the examples to the conventional example, and when the internal pressure of each battery rises, whether the internal pressure is released or not, and whether the constituent elements of the battery are scattered in a burst manner are determined. A burst test was performed to verify. For this verification, a hot plate preset to a predetermined temperature was prepared, and the presence or absence of rupture of the test battery placed on the hot plate and the time until the rupture were measured. The results of the burst test using this hot plate are shown in Table 1.
【００２２】[0022]
【表１】
従来例の場合、電池が高温に曝されて上昇した内圧を
放出できないので、その全数が内圧の封口強度を越える
圧力に達したとき破裂し、キャップケース５が完全に外
れた状態で構成要素を飛散させる結果となった。これに
対して実施例及び実施例の場合、内圧が限界状態に
なる以前に切欠部２から上昇した内圧が放出されるので
破裂に至ることはなく、切欠部２Ａ〜２Ｅが形成された
側でガスケット６が軟化して切欠部２Ａ〜２Ｅに流動
し、シールに緩みが生じた部分から内圧を放出し、切欠
部２が形成された側と直径方向の反対位置では封口が維
持された状態となった。実施例のように切欠部２の形
成は１か所でも効果があるが、温度上昇の速度が速い場
合に破裂に至ることもあるので、実施例及び実施例
の構成のように複数か所に形成することにより異常内圧
放出の確実性を高めることができる。[Table 1] In the case of the conventional example, since the battery cannot release the increased internal pressure due to being exposed to high temperature, it bursts when all of them reach a pressure exceeding the sealing strength of the internal pressure, and the cap case 5 is completely detached from the constituent elements. The result was scattering. On the other hand, in the case of the embodiment and the embodiment, since the increased internal pressure is released from the cutout portion 2 before the internal pressure reaches the limit state, it does not lead to rupture, and on the side where the cutout portions 2A to 2E are formed. The gasket 6 is softened and flows into the cutouts 2A to 2E, releasing the internal pressure from the portion where the seal is loosened, and the sealing is maintained at the position opposite to the side where the cutout 2 is formed and the diametrical direction. became. The formation of the notch 2 as in the embodiment is effective even at one place, but since it may lead to rupture when the temperature rising speed is fast, it may occur at a plurality of places as in the embodiment and the configuration of the embodiment. By forming it, it is possible to increase the certainty of the abnormal internal pressure release.
【００２３】上記検証結果から、キャップケース５の開
口端に１か所以上の切欠部２を形成することにより、電
池が高温に曝されて内圧が異常上昇したときに、ガスケ
ット６の軟化に伴う変形、流動によって切欠部２から内
圧を放出して、キャップケース５が飛散するような状態
を防ぐことができる。更に複数の切欠部２を開口端のい
ずれか一方に偏らせて形成すると、より確実にキャップ
ケース５の飛散を防止できる。From the above verification results, by forming one or more notches 2 at the open end of the cap case 5, when the battery is exposed to high temperature and the internal pressure rises abnormally, the gasket 6 softens. It is possible to prevent the cap case 5 from scattering by releasing the internal pressure from the notch 2 due to the deformation and the flow. Further, if the plurality of cutouts 2 are formed so as to be biased to one of the open ends, the cap case 5 can be more reliably prevented from scattering.
【００２４】[0024]
【発明の効果】以上の説明の通り本発明によれば、コイ
ン形電池のように小型電池において、異常上昇した内圧
の放出弁を設けるスペースのない場合でも、カシメ封口
部分に内圧放出のための切欠部を設けることができるの
で、電池が高温に曝されて異常上昇した内圧によって電
池が破裂状態になることが防止できる。特に、過充電等
の間違った使用や高温状態に至るケースの多い二次電池
をコイン形電池として構成する場合に有効な手段とな
る。As described above, according to the present invention, in a small battery such as a coin battery, even if there is no space for providing a release valve for the abnormally increased internal pressure, the internal pressure can be released at the caulking sealing portion. Since the notch can be provided, it is possible to prevent the battery from being in a ruptured state due to the internal pressure that is abnormally increased by exposing the battery to a high temperature. In particular, this is an effective means when a secondary battery, which is often used incorrectly such as overcharging or in a high temperature state, is configured as a coin battery.
【図１】実施形態に係るコイン形電池の構成を示す断面
図。FIG. 1 is a cross-sectional view showing a configuration of a coin battery according to an embodiment.
【図２】同上コイン形電池の外装ケースの構成を示す斜
視図。FIG. 2 is a perspective view showing a structure of an outer case of the coin-shaped battery of the same.
【図３】切欠部の形状例を（ａ）〜（ｃ）に示す部分側
面図。FIG. 3 is a partial side view showing examples of the shape of a cutout portion in (a) to (c).
【図４】実施例に係るコイン形電池の封口前の状態を示
す断面図。FIG. 4 is a cross-sectional view showing a state before sealing the coin battery according to the embodiment.
【図５】内圧が異常上昇した状態を模式的に示す断面
図。FIG. 5 is a cross-sectional view that schematically shows a state in which the internal pressure is abnormally increased.
【図６】切欠部の形成数による効果をテストする説明
図。FIG. 6 is an explanatory diagram for testing the effect of the number of cutouts formed.
【図７】従来構成になるコイン形電池の構成を示す断面
図。FIG. 7 is a cross-sectional view showing a configuration of a coin-type battery having a conventional configuration.
【図８】従来構成になるコイン形電池の構成を示す断面
図。FIG. 8 is a cross-sectional view showing a configuration of a coin-type battery having a conventional configuration.
１ 極板群 ２、２ａ、２ｂ 切欠部 ４ 封口ケース ４ｂ 段差部 ４ｃ 肩部 ４ｄ 側周部 ５ キャップケース ６ ガスケット 1 plate group 2, 2a, 2b Notch 4 sealing case 4b step 4c shoulder 4d side circumference 5 cap case 6 gasket
───────────────────────────────────────────────────── フロントページの続き (72)発明者 秋谷 弘之 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Ｆターム(参考） 5H011 AA13 BB04 CC06 DD03 DD06 5H012 AA04 BB08 CC01 EE01 FF03 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hiroyuki Akiya 1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric Sangyo Co., Ltd. F term (reference) 5H011 AA13 BB04 CC06 DD03 DD06 5H012 AA04 BB08 CC01 EE01 FF03
Claims (3)
た封口ケースと、この封口ケースより大きな外径の半殻
体に形成されたキャップケースとを、互いの開口部を対
向させ、互いの側周部の間にガスケットを介在させて封
口ケース上にキャップケースを被せた内部空間内に発電
要素を収容し、キャップケースの開口端を縮口するカシ
メ加工によりガスケットを前記段差上に圧縮することに
よって前記内部空間が密閉されてなるコイン形電池にお
いて、 前記キャップケースの開口端に、それを切り欠いた切欠
部が１か所以上に形成されてなることを特徴とするコイ
ン形電池。1. A sealing case formed by forming a step on a side peripheral portion of a half-shell and a cap case formed on a half-shell having an outer diameter larger than that of the sealing case have their openings opposed to each other. The power generation element is housed in the inner space where the cap case is covered on the sealing case with the gasket interposed between the side peripheral portions, and the gasket is stepped by caulking the opening end of the cap case. A coin-shaped battery in which the internal space is sealed by being compressed upward, wherein a notch portion is formed at the opening end of the cap case, and the notch is formed at one or more places. Shaped battery.
形成されてなる請求項１に記載のコイン形電池。2. The coin battery according to claim 1, wherein the plurality of cutout portions are formed so as to be biased toward one of the open ends.
ケットを介して封口ケースに被せたとき、その最深部が
封口ケースの側周部に形成された段差の肩部分の高さ位
置と略同等の位置になるように形成されてなる請求項１
または２に記載のコイン形電池。3. The depth of the notch is substantially the same as the height position of the shoulder portion of the step formed on the side peripheral portion of the sealing case when the cap case is covered with the sealing case via the gasket. The device is formed so as to be at the same position.
Alternatively, the coin-type battery described in 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001230903A JP5226165B2 (en) | 2001-07-31 | 2001-07-31 | Coin battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001230903A JP5226165B2 (en) | 2001-07-31 | 2001-07-31 | Coin battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003045379A true JP2003045379A (en) | 2003-02-14 |
| JP5226165B2 JP5226165B2 (en) | 2013-07-03 |
Family
ID=19063034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001230903A Expired - Fee Related JP5226165B2 (en) | 2001-07-31 | 2001-07-31 | Coin battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5226165B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019536254A (en) * | 2016-12-30 | 2019-12-12 | チョンチン ブイディーエル エレクトロニクス カンパニー，リミテッド | Button battery and manufacturing method thereof |
| WO2021189667A1 (en) * | 2020-03-27 | 2021-09-30 | 福建南平延平区南孚新能源科技有限公司 | Rechargeable button cell |
| CN116683134A (en) * | 2023-08-03 | 2023-09-01 | 中自环保科技股份有限公司 | Explosion-proof structure of jumbo size cylinder battery |
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| JPS575261A (en) * | 1980-06-12 | 1982-01-12 | Casio Comput Co Ltd | Alkaline battery |
| JPH0443854U (en) * | 1990-08-10 | 1992-04-14 | ||
| JP2002134072A (en) * | 2000-10-27 | 2002-05-10 | Toshiba Battery Co Ltd | Flattened non-aqueous electrolytic secondary battery |
| JP2002134073A (en) * | 2000-10-27 | 2002-05-10 | Toshiba Battery Co Ltd | Flattened non-aqueous electrolytic secondary battery |
-
2001
- 2001-07-31 JP JP2001230903A patent/JP5226165B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52149332A (en) * | 1976-06-07 | 1977-12-12 | Suwa Seikosha Kk | Button type enclosed storage battery |
| JPS575261A (en) * | 1980-06-12 | 1982-01-12 | Casio Comput Co Ltd | Alkaline battery |
| JPH0443854U (en) * | 1990-08-10 | 1992-04-14 | ||
| JP2002134072A (en) * | 2000-10-27 | 2002-05-10 | Toshiba Battery Co Ltd | Flattened non-aqueous electrolytic secondary battery |
| JP2002134073A (en) * | 2000-10-27 | 2002-05-10 | Toshiba Battery Co Ltd | Flattened non-aqueous electrolytic secondary battery |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019536254A (en) * | 2016-12-30 | 2019-12-12 | チョンチン ブイディーエル エレクトロニクス カンパニー，リミテッド | Button battery and manufacturing method thereof |
| US11165088B2 (en) | 2016-12-30 | 2021-11-02 | Chongqing Vdl Electronics Co., Ltd. | Button battery and manufacturing method therefor |
| WO2021189667A1 (en) * | 2020-03-27 | 2021-09-30 | 福建南平延平区南孚新能源科技有限公司 | Rechargeable button cell |
| CN116683134A (en) * | 2023-08-03 | 2023-09-01 | 中自环保科技股份有限公司 | Explosion-proof structure of jumbo size cylinder battery |
| CN116683134B (en) * | 2023-08-03 | 2023-10-24 | 中自环保科技股份有限公司 | Explosion-proof structure of cylindrical battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5226165B2 (en) | 2013-07-03 |
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